/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 1990 Mentat Inc.
 * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2017 Nexenta Systems, Inc.
 * Copyright 2017 OmniTI Computer Consulting, Inc. All rights reserved.
 * Copyright 2019, Joyent, Inc.
 * Copyright 2026 Oxide Computer Company
 */

#ifndef _INET_IP_H
#define _INET_IP_H

#ifdef  __cplusplus
extern "C" {
#endif

#include <sys/isa_defs.h>
#include <sys/types.h>
#include <inet/mib2.h>
#include <inet/nd.h>
#include <sys/atomic.h>
#include <net/if_dl.h>
#include <net/if.h>
#include <netinet/ip.h>
#include <netinet/igmp.h>
#include <sys/neti.h>
#include <sys/hook.h>
#include <sys/hook_event.h>
#include <sys/hook_impl.h>
#include <inet/ip_stack.h>

#ifdef _KERNEL
#include <netinet/ip6.h>
#include <sys/avl.h>
#include <sys/list.h>
#include <sys/vmem.h>
#include <sys/squeue.h>
#include <net/route.h>
#include <sys/systm.h>
#include <net/radix.h>
#include <sys/modhash.h>

#ifdef DEBUG
#define CONN_DEBUG
#endif

#define IP_DEBUG
/*
 * The mt-streams(9F) flags for the IP module; put here so that other
 * "drivers" that are actually IP (e.g., ICMP, UDP) can use the same set
 * of flags.
 */
#define IP_DEVMTFLAGS D_MP
#endif  /* _KERNEL */

#define IP_MOD_NAME     "ip"
#define IP_DEV_NAME     "/dev/ip"
#define IP6_DEV_NAME    "/dev/ip6"

#define UDP_MOD_NAME    "udp"
#define UDP_DEV_NAME    "/dev/udp"
#define UDP6_DEV_NAME   "/dev/udp6"

#define TCP_MOD_NAME    "tcp"
#define TCP_DEV_NAME    "/dev/tcp"
#define TCP6_DEV_NAME   "/dev/tcp6"

#define SCTP_MOD_NAME   "sctp"

#ifndef _IPADDR_T
#define _IPADDR_T
typedef uint32_t ipaddr_t;
#endif

/* Number of bits in an address */
#define IP_ABITS                32
#define IPV4_ABITS              IP_ABITS
#define IPV6_ABITS              128
#define IP_MAX_HW_LEN   40

#define IP_HOST_MASK            (ipaddr_t)0xffffffffU

#define IP_CSUM(mp, off, sum)           (~ip_cksum(mp, off, sum) & 0xFFFF)
#define IP_CSUM_PARTIAL(mp, off, sum)   ip_cksum(mp, off, sum)
#define IP_BCSUM_PARTIAL(bp, len, sum)  bcksum(bp, len, sum)

#define ILL_FRAG_HASH_TBL_COUNT ((unsigned int)64)
#define ILL_FRAG_HASH_TBL_SIZE  (ILL_FRAG_HASH_TBL_COUNT * sizeof (ipfb_t))

#define IPV4_ADDR_LEN                   4
#define IP_ADDR_LEN                     IPV4_ADDR_LEN
#define IP_ARP_PROTO_TYPE               0x0800

#define IPV4_VERSION                    4
#define IP_VERSION                      IPV4_VERSION
#define IP_SIMPLE_HDR_LENGTH_IN_WORDS   5
#define IP_SIMPLE_HDR_LENGTH            20
#define IP_MAX_HDR_LENGTH               60

#define IP_MAX_OPT_LENGTH (IP_MAX_HDR_LENGTH-IP_SIMPLE_HDR_LENGTH)

#define IP_MIN_MTU                      (IP_MAX_HDR_LENGTH + 8) /* 68 bytes */

/*
 * XXX IP_MAXPACKET is defined in <netinet/ip.h> as well. At some point the
 * 2 files should be cleaned up to remove all redundant definitions.
 */
#define IP_MAXPACKET                    65535
#define IP_SIMPLE_HDR_VERSION \
        ((IP_VERSION << 4) | IP_SIMPLE_HDR_LENGTH_IN_WORDS)

#define UDPH_SIZE                       8

/*
 * Constants and type definitions to support IP IOCTL commands
 */
#define IP_IOCTL                        (('i'<<8)|'p')
#define IP_IOC_IRE_DELETE               4
#define IP_IOC_IRE_DELETE_NO_REPLY      5
#define IP_IOC_RTS_REQUEST              7

/* Common definitions used by IP IOCTL data structures */
typedef struct ipllcmd_s {
        uint_t  ipllc_cmd;
        uint_t  ipllc_name_offset;
        uint_t  ipllc_name_length;
} ipllc_t;

/* IP IRE Delete Command Structure. */
typedef struct ipid_s {
        ipllc_t ipid_ipllc;
        uint_t  ipid_ire_type;
        uint_t  ipid_addr_offset;
        uint_t  ipid_addr_length;
        uint_t  ipid_mask_offset;
        uint_t  ipid_mask_length;
} ipid_t;

#define ipid_cmd                ipid_ipllc.ipllc_cmd

#ifdef _KERNEL
/*
 * Temporary state for ip options parser.
 */
typedef struct ipoptp_s
{
        uint8_t         *ipoptp_next;   /* next option to look at */
        uint8_t         *ipoptp_end;    /* end of options */
        uint8_t         *ipoptp_cur;    /* start of current option */
        uint8_t         ipoptp_len;     /* length of current option */
        uint32_t        ipoptp_flags;
} ipoptp_t;

/*
 * Flag(s) for ipoptp_flags
 */
#define IPOPTP_ERROR    0x00000001
#endif  /* _KERNEL */

/* Controls forwarding of IP packets, set via ipadm(8)/ndd(8) */
#define IP_FORWARD_NEVER        0
#define IP_FORWARD_ALWAYS       1

#define WE_ARE_FORWARDING(ipst) ((ipst)->ips_ip_forwarding == IP_FORWARD_ALWAYS)

#define IPH_HDR_LENGTH(ipha)                                            \
        ((int)(((ipha_t *)ipha)->ipha_version_and_hdr_length & 0xF) << 2)

#define IPH_HDR_VERSION(ipha)                                           \
        ((int)(((ipha_t *)ipha)->ipha_version_and_hdr_length) >> 4)

#ifdef _KERNEL
/*
 * IP reassembly macros.  We hide starting and ending offsets in b_next and
 * b_prev of messages on the reassembly queue.  The messages are chained using
 * b_cont.  These macros are used in ip_reassemble() so we don't have to see
 * the ugly casts and assignments.
 * Note that the offsets are <= 64k i.e. a uint_t is sufficient to represent
 * them.
 */
#define IP_REASS_START(mp)              ((uint_t)(uintptr_t)((mp)->b_next))
#define IP_REASS_SET_START(mp, u)       \
        ((mp)->b_next = (mblk_t *)(uintptr_t)(u))
#define IP_REASS_END(mp)                ((uint_t)(uintptr_t)((mp)->b_prev))
#define IP_REASS_SET_END(mp, u)         \
        ((mp)->b_prev = (mblk_t *)(uintptr_t)(u))

#define IP_REASS_COMPLETE       0x1
#define IP_REASS_PARTIAL        0x2
#define IP_REASS_FAILED         0x4

/*
 * Test to determine whether this is a module instance of IP or a
 * driver instance of IP.
 */
#define CONN_Q(q)       (WR(q)->q_next == NULL)

#define Q_TO_CONN(q)    ((conn_t *)(q)->q_ptr)
#define Q_TO_TCP(q)     (Q_TO_CONN((q))->conn_tcp)
#define Q_TO_UDP(q)     (Q_TO_CONN((q))->conn_udp)
#define Q_TO_ICMP(q)    (Q_TO_CONN((q))->conn_icmp)
#define Q_TO_RTS(q)     (Q_TO_CONN((q))->conn_rts)

#define CONNP_TO_WQ(connp)      ((connp)->conn_wq)
#define CONNP_TO_RQ(connp)      ((connp)->conn_rq)

#define GRAB_CONN_LOCK(q)       {                               \
        if (q != NULL && CONN_Q(q))                             \
                mutex_enter(&(Q_TO_CONN(q))->conn_lock);        \
}

#define RELEASE_CONN_LOCK(q)    {                               \
        if (q != NULL && CONN_Q(q))                             \
                mutex_exit(&(Q_TO_CONN(q))->conn_lock);         \
}

/*
 * Ref counter macros for ioctls. This provides a guard for TCP to stop
 * tcp_close from removing the rq/wq whilst an ioctl is still in flight on the
 * stream. The ioctl could have been queued on e.g. an ipsq. tcp_close will wait
 * until the ioctlref count is zero before proceeding.
 * Ideally conn_oper_pending_ill would be used for this purpose. However, in the
 * case where an ioctl is aborted or interrupted, it can be cleared prematurely.
 * There are also some race possibilities between ip and the stream head which
 * can also end up with conn_oper_pending_ill being cleared prematurely. So, to
 * avoid these situations, we use a dedicated ref counter for ioctls which is
 * used in addition to and in parallel with the normal conn_ref count.
 */
#define CONN_INC_IOCTLREF_LOCKED(connp) {                       \
        ASSERT(MUTEX_HELD(&(connp)->conn_lock));                \
        DTRACE_PROBE1(conn__inc__ioctlref, conn_t *, (connp));  \
        (connp)->conn_ioctlref++;                               \
        mutex_exit(&(connp)->conn_lock);                        \
}

#define CONN_INC_IOCTLREF(connp)        {                       \
        mutex_enter(&(connp)->conn_lock);                       \
        CONN_INC_IOCTLREF_LOCKED(connp);                        \
}

#define CONN_DEC_IOCTLREF(connp)        {                       \
        mutex_enter(&(connp)->conn_lock);                       \
        DTRACE_PROBE1(conn__dec__ioctlref, conn_t *, (connp));  \
        /* Make sure conn_ioctlref will not underflow. */       \
        ASSERT((connp)->conn_ioctlref != 0);                    \
        if ((--(connp)->conn_ioctlref == 0) &&                  \
            ((connp)->conn_state_flags & CONN_CLOSING)) {       \
                cv_broadcast(&(connp)->conn_cv);                \
        }                                                       \
        mutex_exit(&(connp)->conn_lock);                        \
}


/*
 * Complete the pending operation. Usually an ioctl. Can also
 * be a bind or option management request that got enqueued
 * in an ipsq_t. Called on completion of the operation.
 */
#define CONN_OPER_PENDING_DONE(connp)   {                       \
        mutex_enter(&(connp)->conn_lock);                       \
        (connp)->conn_oper_pending_ill = NULL;                  \
        cv_broadcast(&(connp)->conn_refcv);                     \
        mutex_exit(&(connp)->conn_lock);                        \
        CONN_DEC_REF(connp);                                    \
}

/*
 * Values for squeue switch:
 */
#define IP_SQUEUE_ENTER_NODRAIN 1
#define IP_SQUEUE_ENTER 2
#define IP_SQUEUE_FILL 3

extern int ip_squeue_flag;

/* IP Fragmentation Reassembly Header */
typedef struct ipf_s {
        struct ipf_s    *ipf_hash_next;
        struct ipf_s    **ipf_ptphn;    /* Pointer to previous hash next. */
        uint32_t        ipf_ident;      /* Ident to match. */
        uint8_t         ipf_protocol;   /* Protocol to match. */
        uchar_t         ipf_last_frag_seen : 1; /* Last fragment seen ? */
        time_t          ipf_timestamp;  /* Reassembly start time. */
        mblk_t          *ipf_mp;        /* mblk we live in. */
        mblk_t          *ipf_tail_mp;   /* Frag queue tail pointer. */
        int             ipf_hole_cnt;   /* Number of holes (hard-case). */
        int             ipf_end;        /* Tail end offset (0 -> hard-case). */
        uint_t          ipf_gen;        /* Frag queue generation */
        size_t          ipf_count;      /* Count of bytes used by frag */
        uint_t          ipf_nf_hdr_len; /* Length of nonfragmented header */
        in6_addr_t      ipf_v6src;      /* IPv6 source address */
        in6_addr_t      ipf_v6dst;      /* IPv6 dest address */
        uint_t          ipf_prev_nexthdr_offset; /* Offset for nexthdr value */
        uint8_t         ipf_ecn;        /* ECN info for the fragments */
        uint8_t         ipf_num_dups;   /* Number of times dup frags recvd */
        uint16_t        ipf_checksum_flags; /* Hardware checksum flags */
        uint32_t        ipf_checksum;   /* Partial checksum of fragment data */
} ipf_t;

/*
 * IPv4 Fragments
 */
#define IS_V4_FRAGMENT(ipha_fragment_offset_and_flags)                  \
        (((ntohs(ipha_fragment_offset_and_flags) & IPH_OFFSET) != 0) || \
        ((ntohs(ipha_fragment_offset_and_flags) & IPH_MF) != 0))

#define ipf_src V4_PART_OF_V6(ipf_v6src)
#define ipf_dst V4_PART_OF_V6(ipf_v6dst)

#endif /* _KERNEL */

/* ICMP types */
#define ICMP_ECHO_REPLY                 0
#define ICMP_DEST_UNREACHABLE           3
#define ICMP_SOURCE_QUENCH              4
#define ICMP_REDIRECT                   5
#define ICMP_ECHO_REQUEST               8
#define ICMP_ROUTER_ADVERTISEMENT       9
#define ICMP_ROUTER_SOLICITATION        10
#define ICMP_TIME_EXCEEDED              11
#define ICMP_PARAM_PROBLEM              12
#define ICMP_TIME_STAMP_REQUEST         13
#define ICMP_TIME_STAMP_REPLY           14
#define ICMP_INFO_REQUEST               15
#define ICMP_INFO_REPLY                 16
#define ICMP_ADDRESS_MASK_REQUEST       17
#define ICMP_ADDRESS_MASK_REPLY         18

/* Evaluates to true if the ICMP type is an ICMP error */
#define ICMP_IS_ERROR(type)     (               \
        (type) == ICMP_DEST_UNREACHABLE ||      \
        (type) == ICMP_SOURCE_QUENCH ||         \
        (type) == ICMP_TIME_EXCEEDED ||         \
        (type) == ICMP_PARAM_PROBLEM)

/* ICMP_TIME_EXCEEDED codes */
#define ICMP_TTL_EXCEEDED               0
#define ICMP_REASSEMBLY_TIME_EXCEEDED   1

/* ICMP_DEST_UNREACHABLE codes */
#define ICMP_NET_UNREACHABLE            0
#define ICMP_HOST_UNREACHABLE           1
#define ICMP_PROTOCOL_UNREACHABLE       2
#define ICMP_PORT_UNREACHABLE           3
#define ICMP_FRAGMENTATION_NEEDED       4
#define ICMP_SOURCE_ROUTE_FAILED        5
#define ICMP_DEST_NET_UNKNOWN           6
#define ICMP_DEST_HOST_UNKNOWN          7
#define ICMP_SRC_HOST_ISOLATED          8
#define ICMP_DEST_NET_UNREACH_ADMIN     9
#define ICMP_DEST_HOST_UNREACH_ADMIN    10
#define ICMP_DEST_NET_UNREACH_TOS       11
#define ICMP_DEST_HOST_UNREACH_TOS      12

/* ICMP Header Structure */
typedef struct icmph_s {
        uint8_t         icmph_type;
        uint8_t         icmph_code;
        uint16_t        icmph_checksum;
        union {
                struct { /* ECHO request/response structure */
                        uint16_t        u_echo_ident;
                        uint16_t        u_echo_seqnum;
                } u_echo;
                struct { /* Destination unreachable structure */
                        uint16_t        u_du_zero;
                        uint16_t        u_du_mtu;
                } u_du;
                struct { /* Parameter problem structure */
                        uint8_t         u_pp_ptr;
                        uint8_t         u_pp_rsvd[3];
                } u_pp;
                struct { /* Redirect structure */
                        ipaddr_t        u_rd_gateway;
                } u_rd;
        } icmph_u;
} icmph_t;

#define icmph_echo_ident        icmph_u.u_echo.u_echo_ident
#define icmph_echo_seqnum       icmph_u.u_echo.u_echo_seqnum
#define icmph_du_zero           icmph_u.u_du.u_du_zero
#define icmph_du_mtu            icmph_u.u_du.u_du_mtu
#define icmph_pp_ptr            icmph_u.u_pp.u_pp_ptr
#define icmph_rd_gateway        icmph_u.u_rd.u_rd_gateway

#define ICMPH_SIZE      8

/*
 * Minimum length of transport layer header included in an ICMP error
 * message for it to be considered valid.
 */
#define ICMP_MIN_TP_HDR_LEN     8

/* Aligned IP header */
typedef struct ipha_s {
        uint8_t         ipha_version_and_hdr_length;
        uint8_t         ipha_type_of_service;
        uint16_t        ipha_length;
        uint16_t        ipha_ident;
        uint16_t        ipha_fragment_offset_and_flags;
        uint8_t         ipha_ttl;
        uint8_t         ipha_protocol;
        uint16_t        ipha_hdr_checksum;
        ipaddr_t        ipha_src;
        ipaddr_t        ipha_dst;
} ipha_t;

/*
 * IP Flags
 *
 * Some of these constant names are copied for the DTrace IP provider in
 * usr/src/lib/libdtrace/common/{ip.d.in, ip.sed.in}, which should be kept
 * in sync.
 */
#define IPH_DF          0x4000  /* Don't fragment */
#define IPH_MF          0x2000  /* More fragments to come */
#define IPH_OFFSET      0x1FFF  /* Where the offset lives */

/* Byte-order specific values */
#ifdef  _BIG_ENDIAN
#define IPH_DF_HTONS    0x4000  /* Don't fragment */
#define IPH_MF_HTONS    0x2000  /* More fragments to come */
#define IPH_OFFSET_HTONS 0x1FFF /* Where the offset lives */
#else
#define IPH_DF_HTONS    0x0040  /* Don't fragment */
#define IPH_MF_HTONS    0x0020  /* More fragments to come */
#define IPH_OFFSET_HTONS 0xFF1F /* Where the offset lives */
#endif

/* ECN code points for IPv4 TOS byte and IPv6 traffic class octet. */
#define IPH_ECN_NECT    0x0     /* Not ECN-Capable Transport */
#define IPH_ECN_ECT1    0x1     /* ECN-Capable Transport, ECT(1) */
#define IPH_ECN_ECT0    0x2     /* ECN-Capable Transport, ECT(0) */
#define IPH_ECN_CE      0x3     /* ECN-Congestion Experienced (CE) */

struct ill_s;

typedef void ip_v6intfid_func_t(struct ill_s *, in6_addr_t *);
typedef void ip_v6mapinfo_func_t(struct ill_s *, uchar_t *, uchar_t *);
typedef void ip_v4mapinfo_func_t(struct ill_s *, uchar_t *, uchar_t *);

/* IP Mac info structure */
typedef struct ip_m_s {
        t_uscalar_t             ip_m_mac_type;  /* From <sys/dlpi.h> */
        int                     ip_m_type;      /* From <net/if_types.h> */
        t_uscalar_t             ip_m_ipv4sap;
        t_uscalar_t             ip_m_ipv6sap;
        ip_v4mapinfo_func_t     *ip_m_v4mapping;
        ip_v6mapinfo_func_t     *ip_m_v6mapping;
        ip_v6intfid_func_t      *ip_m_v6intfid;
        ip_v6intfid_func_t      *ip_m_v6destintfid;
} ip_m_t;

/*
 * The following functions attempt to reduce the link layer dependency
 * of the IP stack. The current set of link specific operations are:
 * a. map from IPv4 class D (224.0/4) multicast address range or the
 * IPv6 multicast address range (ff00::/8) to the link layer multicast
 * address.
 * b. derive the default IPv6 interface identifier from the interface.
 * c. derive the default IPv6 destination interface identifier from
 * the interface (point-to-point only).
 */
extern  void ip_mcast_mapping(struct ill_s *, uchar_t *, uchar_t *);
/* ip_m_v6*intfid return void and are never NULL */
#define MEDIA_V6INTFID(ip_m, ill, v6ptr) (ip_m)->ip_m_v6intfid(ill, v6ptr)
#define MEDIA_V6DESTINTFID(ip_m, ill, v6ptr) \
        (ip_m)->ip_m_v6destintfid(ill, v6ptr)

/* Router entry types */
#define IRE_BROADCAST           0x0001  /* Route entry for broadcast address */
#define IRE_DEFAULT             0x0002  /* Route entry for default gateway */
#define IRE_LOCAL               0x0004  /* Route entry for local address */
#define IRE_LOOPBACK            0x0008  /* Route entry for loopback address */
#define IRE_PREFIX              0x0010  /* Route entry for prefix routes */
#ifndef _KERNEL
/* Keep so user-level still compiles */
#define IRE_CACHE               0x0020  /* Cached Route entry */
#endif
#define IRE_IF_NORESOLVER       0x0040  /* Route entry for local interface */
                                        /* net without any address mapping. */
#define IRE_IF_RESOLVER         0x0080  /* Route entry for local interface */
                                        /* net with resolver. */
#define IRE_HOST                0x0100  /* Host route entry */
/* Keep so user-level still compiles */
#define IRE_HOST_REDIRECT       0x0200  /* only used for T_SVR4_OPTMGMT_REQ */
#define IRE_IF_CLONE            0x0400  /* Per host clone of IRE_IF */
#define IRE_MULTICAST           0x0800  /* Special - not in table */
#define IRE_NOROUTE             0x1000  /* Special - not in table */

#define IRE_INTERFACE           (IRE_IF_NORESOLVER | IRE_IF_RESOLVER)

#define IRE_IF_ALL              (IRE_IF_NORESOLVER | IRE_IF_RESOLVER | \
                                    IRE_IF_CLONE)
#define IRE_OFFSUBNET           (IRE_DEFAULT | IRE_PREFIX | IRE_HOST)
#define IRE_OFFLINK             IRE_OFFSUBNET
/*
 * Note that we view IRE_NOROUTE as ONLINK since we can "send" to them without
 * going through a router; the result of sending will be an error/icmp error.
 */
#define IRE_ONLINK              (IRE_IF_ALL|IRE_LOCAL|IRE_LOOPBACK| \
                                    IRE_BROADCAST|IRE_MULTICAST|IRE_NOROUTE)

/* Arguments to ire_flush_cache() */
#define IRE_FLUSH_DELETE        0
#define IRE_FLUSH_ADD           1
#define IRE_FLUSH_GWCHANGE      2

/*
 * Flags to ire_route_recursive
 */
#define IRR_NONE                0
#define IRR_ALLOCATE            1       /* OK to allocate IRE_IF_CLONE */
#define IRR_INCOMPLETE          2       /* OK to return incomplete chain */

/*
 * Open/close synchronization flags.
 * These are kept in a separate field in the conn and the synchronization
 * depends on the atomic 32 bit access to that field.
 */
#define CONN_CLOSING            0x01    /* ip_close waiting for ip_wsrv */
#define CONN_CONDEMNED          0x02    /* conn is closing, no more refs */
#define CONN_INCIPIENT          0x04    /* conn not yet visible, no refs */
#define CONN_QUIESCED           0x08    /* conn is now quiescent */
#define CONN_UPDATE_ILL         0x10    /* conn_update_ill in progress */

/*
 * Flags for dce_flags field. Specifies which information has been set.
 * dce_ident is always present, but the other ones are identified by the flags.
 */
#define DCEF_DEFAULT            0x0001  /* Default DCE - no pmtu or uinfo */
#define DCEF_PMTU               0x0002  /* Different than interface MTU */
#define DCEF_UINFO              0x0004  /* dce_uinfo set */
#define DCEF_TOO_SMALL_PMTU     0x0008  /* Smaller than IPv4 MIN */

#ifdef _KERNEL
/*
 * Extra structures need for per-src-addr filtering (IGMPv3/MLDv2)
 */
#define MAX_FILTER_SIZE 64

typedef struct slist_s {
        int             sl_numsrc;
        in6_addr_t      sl_addr[MAX_FILTER_SIZE];
} slist_t;

/*
 * Following struct is used to maintain retransmission state for
 * a multicast group.  One rtx_state_t struct is an in-line field
 * of the ilm_t struct; the slist_ts in the rtx_state_t struct are
 * alloc'd as needed.
 */
typedef struct rtx_state_s {
        uint_t          rtx_timer;      /* retrans timer */
        int             rtx_cnt;        /* retrans count */
        int             rtx_fmode_cnt;  /* retrans count for fmode change */
        slist_t         *rtx_allow;
        slist_t         *rtx_block;
} rtx_state_t;

/*
 * Used to construct list of multicast address records that will be
 * sent in a single listener report.
 */
typedef struct mrec_s {
        struct mrec_s   *mrec_next;
        uint8_t         mrec_type;
        uint8_t         mrec_auxlen;    /* currently unused */
        in6_addr_t      mrec_group;
        slist_t         mrec_srcs;
} mrec_t;

/* Group membership list per upper conn */

/*
 * We record the multicast information from the socket option in
 * ilg_ifaddr/ilg_ifindex. This allows rejoining the group in the case when
 * the ifaddr (or ifindex) disappears and later reappears, potentially on
 * a different ill. The IPv6 multicast socket options and ioctls all specify
 * the interface using an ifindex. For IPv4 some socket options/ioctls use
 * the interface address and others use the index. We record here the method
 * that was actually used (and leave the other of ilg_ifaddr or ilg_ifindex)
 * at zero so that we can rejoin the way the application intended.
 *
 * We track the ill on which we will or already have joined an ilm using
 * ilg_ill. When we have succeeded joining the ilm and have a refhold on it
 * then we set ilg_ilm. Thus intentionally there is a window where ilg_ill is
 * set and ilg_ilm is not set. This allows clearing ilg_ill as a signal that
 * the ill is being unplumbed and the ilm should be discarded.
 *
 * ilg records the state of multicast memberships of a socket end point.
 * ilm records the state of multicast memberships with the driver and is
 * maintained per interface.
 *
 * The ilg state is protected by conn_ilg_lock.
 * The ilg will not be freed until ilg_refcnt drops to zero.
 */
typedef struct ilg_s {
        struct ilg_s    *ilg_next;
        struct ilg_s    **ilg_ptpn;
        struct conn_s   *ilg_connp;     /* Back pointer to get lock */
        in6_addr_t      ilg_v6group;
        ipaddr_t        ilg_ifaddr;     /* For some IPv4 cases */
        uint_t          ilg_ifindex;    /* IPv6 and some other IPv4 cases */
        struct ill_s    *ilg_ill;       /* Where ilm is joined. No refhold */
        struct ilm_s    *ilg_ilm;       /* With ilm_refhold */
        uint_t          ilg_refcnt;
        mcast_record_t  ilg_fmode;      /* MODE_IS_INCLUDE/MODE_IS_EXCLUDE */
        slist_t         *ilg_filter;
        boolean_t       ilg_condemned;  /* Conceptually deleted */
} ilg_t;

/*
 * Multicast address list entry for ill.
 * ilm_ill is used by IPv4 and IPv6
 *
 * The ilm state (and other multicast state on the ill) is protected by
 * ill_mcast_lock. Operations that change state on both an ilg and ilm
 * in addition use ill_mcast_serializer to ensure that we can't have
 * interleaving between e.g., add and delete operations for the same conn_t,
 * group, and ill. The ill_mcast_serializer is also used to ensure that
 * multicast group joins do not occur on an interface that is in the process
 * of joining an IPMP group.
 *
 * The comment below (and for other netstack_t references) refers
 * to the fact that we only do netstack_hold in particular cases,
 * such as the references from open endpoints (ill_t and conn_t's
 * pointers). Internally within IP we rely on IP's ability to cleanup e.g.
 * ire_t's when an ill goes away.
 */
typedef struct ilm_s {
        in6_addr_t      ilm_v6addr;
        int             ilm_refcnt;
        uint_t          ilm_timer;      /* IGMP/MLD query resp timer, in msec */
        struct ilm_s    *ilm_next;      /* Linked list for each ill */
        uint_t          ilm_state;      /* state of the membership */
        struct ill_s    *ilm_ill;       /* Back pointer to ill - ill_ilm_cnt */
        zoneid_t        ilm_zoneid;
        int             ilm_no_ilg_cnt; /* number of joins w/ no ilg */
        mcast_record_t  ilm_fmode;      /* MODE_IS_INCLUDE/MODE_IS_EXCLUDE */
        slist_t         *ilm_filter;    /* source filter list */
        slist_t         *ilm_pendsrcs;  /* relevant src addrs for pending req */
        rtx_state_t     ilm_rtx;        /* SCR retransmission state */
        ipaddr_t        ilm_ifaddr;     /* For IPv4 netstat */
        ip_stack_t      *ilm_ipst;      /* Does not have a netstack_hold */
} ilm_t;

#define ilm_addr        V4_PART_OF_V6(ilm_v6addr)

/*
 * Soft reference to an IPsec SA.
 *
 * On relative terms, conn's can be persistent (living as long as the
 * processes which create them), while SA's are ephemeral (dying when
 * they hit their time-based or byte-based lifetimes).
 *
 * We could hold a hard reference to an SA from an ipsec_latch_t,
 * but this would cause expired SA's to linger for a potentially
 * unbounded time.
 *
 * Instead, we remember the hash bucket number and bucket generation
 * in addition to the pointer.  The bucket generation is incremented on
 * each deletion.
 */
typedef struct ipsa_ref_s
{
        struct ipsa_s   *ipsr_sa;
        struct isaf_s   *ipsr_bucket;
        uint64_t        ipsr_gen;
} ipsa_ref_t;

/*
 * IPsec "latching" state.
 *
 * In the presence of IPsec policy, fully-bound conn's bind a connection
 * to more than just the 5-tuple, but also a specific IPsec action and
 * identity-pair.
 * The identity pair is accessed from both the receive and transmit side
 * hence it is maintained in the ipsec_latch_t structure. conn_latch and
 * ixa_ipsec_latch points to it.
 * The policy and actions are stored in conn_latch_in_policy and
 * conn_latch_in_action for the inbound side, and in ixa_ipsec_policy and
 * ixa_ipsec_action for the transmit side.
 *
 * As an optimization, we also cache soft references to IPsec SA's in
 * ip_xmit_attr_t so that we can fast-path around most of the work needed for
 * outbound IPsec SA selection.
 */
typedef struct ipsec_latch_s
{
        kmutex_t        ipl_lock;
        uint32_t        ipl_refcnt;

        struct ipsid_s  *ipl_local_cid;
        struct ipsid_s  *ipl_remote_cid;
        unsigned int
                        ipl_ids_latched : 1,

                        ipl_pad_to_bit_31 : 31;
} ipsec_latch_t;

#define IPLATCH_REFHOLD(ipl) { \
        atomic_inc_32(&(ipl)->ipl_refcnt);              \
        ASSERT((ipl)->ipl_refcnt != 0);                 \
}

#define IPLATCH_REFRELE(ipl) {                          \
        ASSERT((ipl)->ipl_refcnt != 0);                         \
        membar_exit();                                          \
        if (atomic_dec_32_nv(&(ipl)->ipl_refcnt) == 0)  \
                iplatch_free(ipl);                              \
}

/*
 * peer identity structure.
 */
typedef struct conn_s conn_t;

/*
 * This is used to match an inbound/outbound datagram with policy.
 */
typedef struct ipsec_selector {
        in6_addr_t      ips_local_addr_v6;
        in6_addr_t      ips_remote_addr_v6;
        uint16_t        ips_local_port;
        uint16_t        ips_remote_port;
        uint8_t         ips_icmp_type;
        uint8_t         ips_icmp_code;
        uint8_t         ips_protocol;
        uint8_t         ips_isv4 : 1,
                        ips_is_icmp_inv_acq: 1;
} ipsec_selector_t;

/*
 * Note that we put v4 addresses in the *first* 32-bit word of the
 * selector rather than the last to simplify the prefix match/mask code
 * in spd.c
 */
#define ips_local_addr_v4 ips_local_addr_v6.s6_addr32[0]
#define ips_remote_addr_v4 ips_remote_addr_v6.s6_addr32[0]

/* Values used in IP by IPSEC Code */
#define         IPSEC_OUTBOUND          B_TRUE
#define         IPSEC_INBOUND           B_FALSE

/*
 * There are two variants in policy failures. The packet may come in
 * secure when not needed (IPSEC_POLICY_???_NOT_NEEDED) or it may not
 * have the desired level of protection (IPSEC_POLICY_MISMATCH).
 */
#define IPSEC_POLICY_NOT_NEEDED         0
#define IPSEC_POLICY_MISMATCH           1
#define IPSEC_POLICY_AUTH_NOT_NEEDED    2
#define IPSEC_POLICY_ENCR_NOT_NEEDED    3
#define IPSEC_POLICY_SE_NOT_NEEDED      4
#define IPSEC_POLICY_MAX                5       /* Always max + 1. */

/*
 * Check with IPSEC inbound policy if
 *
 * 1) per-socket policy is present - indicated by conn_in_enforce_policy.
 * 2) Or if we have not cached policy on the conn and the global policy is
 *    non-empty.
 */
#define CONN_INBOUND_POLICY_PRESENT(connp, ipss)        \
        ((connp)->conn_in_enforce_policy ||             \
        (!((connp)->conn_policy_cached) &&              \
        (ipss)->ipsec_inbound_v4_policy_present))

#define CONN_INBOUND_POLICY_PRESENT_V6(connp, ipss)     \
        ((connp)->conn_in_enforce_policy ||             \
        (!(connp)->conn_policy_cached &&                \
        (ipss)->ipsec_inbound_v6_policy_present))

#define CONN_OUTBOUND_POLICY_PRESENT(connp, ipss)       \
        ((connp)->conn_out_enforce_policy ||            \
        (!((connp)->conn_policy_cached) &&              \
        (ipss)->ipsec_outbound_v4_policy_present))

#define CONN_OUTBOUND_POLICY_PRESENT_V6(connp, ipss)    \
        ((connp)->conn_out_enforce_policy ||            \
        (!(connp)->conn_policy_cached &&                \
        (ipss)->ipsec_outbound_v6_policy_present))

/*
 * Information cached in IRE for upper layer protocol (ULP).
 */
typedef struct iulp_s {
        boolean_t       iulp_set;       /* Is any metric set? */
        uint32_t        iulp_ssthresh;  /* Slow start threshold (TCP). */
        clock_t         iulp_rtt;       /* Guestimate in millisecs. */
        clock_t         iulp_rtt_sd;    /* Cached value of RTT variance. */
        uint32_t        iulp_spipe;     /* Send pipe size. */
        uint32_t        iulp_rpipe;     /* Receive pipe size. */
        uint32_t        iulp_rtomax;    /* Max round trip timeout. */
        uint32_t        iulp_sack;      /* Use SACK option (TCP)? */
        uint32_t        iulp_mtu;       /* Setable with routing sockets */

        uint32_t
                iulp_tstamp_ok : 1,     /* Use timestamp option (TCP)? */
                iulp_wscale_ok : 1,     /* Use window scale option (TCP)? */
                iulp_ecn_ok : 1,        /* Enable ECN (for TCP)? */
                iulp_pmtud_ok : 1,      /* Enable PMTUd? */

                /* These three are passed out by ip_set_destination */
                iulp_localnet: 1,       /* IRE_ONLINK */
                iulp_loopback: 1,       /* IRE_LOOPBACK */
                iulp_local: 1,          /* IRE_LOCAL */

                iulp_not_used : 25;
} iulp_t;

/*
 * The conn drain list structure (idl_t), protected by idl_lock.  Each conn_t
 * inserted in the list points back at this idl_t using conn_idl, and is
 * chained by conn_drain_next and conn_drain_prev, which are also protected by
 * idl_lock.  When flow control is relieved, either ip_wsrv() (STREAMS) or
 * ill_flow_enable() (non-STREAMS) will call conn_drain().
 *
 * The conn drain list, idl_t, itself is part of tx cookie list structure.
 * A tx cookie list points to a blocked Tx ring and contains the list of
 * all conn's that are blocked due to the flow-controlled Tx ring (via
 * the idl drain list). Note that a link can have multiple Tx rings. The
 * drain list will store the conn's blocked due to Tx ring being flow
 * controlled.
 */

typedef uintptr_t ip_mac_tx_cookie_t;
typedef struct idl_s idl_t;
typedef struct idl_tx_list_s idl_tx_list_t;

struct idl_tx_list_s {
        ip_mac_tx_cookie_t      txl_cookie;
        kmutex_t                txl_lock;       /* Lock for this list */
        idl_t                   *txl_drain_list;
        int                     txl_drain_index;
};

struct idl_s {
        conn_t          *idl_conn;              /* Head of drain list */
        kmutex_t        idl_lock;               /* Lock for this list */
        idl_tx_list_t   *idl_itl;
};

/*
 * Interface route structure which holds the necessary information to recreate
 * routes that are tied to an interface i.e. have ire_ill set.
 *
 * These routes which were initially created via a routing socket or via the
 * SIOCADDRT ioctl may be gateway routes (RTF_GATEWAY being set) or may be
 * traditional interface routes.  When an ill comes back up after being
 * down, this information will be used to recreate the routes.  These
 * are part of an mblk_t chain that hangs off of the ILL (ill_saved_ire_mp).
 */
typedef struct ifrt_s {
        ushort_t        ifrt_type;              /* Type of IRE */
        in6_addr_t      ifrt_v6addr;            /* Address IRE represents. */
        in6_addr_t      ifrt_v6gateway_addr;    /* Gateway if IRE_OFFLINK */
        in6_addr_t      ifrt_v6setsrc_addr;     /* Src addr if RTF_SETSRC */
        in6_addr_t      ifrt_v6mask;            /* Mask for matching IRE. */
        uint32_t        ifrt_flags;             /* flags related to route */
        iulp_t          ifrt_metrics;           /* Routing socket metrics */
        zoneid_t        ifrt_zoneid;            /* zoneid for route */
} ifrt_t;

#define ifrt_addr               V4_PART_OF_V6(ifrt_v6addr)
#define ifrt_gateway_addr       V4_PART_OF_V6(ifrt_v6gateway_addr)
#define ifrt_mask               V4_PART_OF_V6(ifrt_v6mask)
#define ifrt_setsrc_addr        V4_PART_OF_V6(ifrt_v6setsrc_addr)

/* Number of IP addresses that can be hosted on a physical interface */
#define MAX_ADDRS_PER_IF        8192
/*
 * Number of Source addresses to be considered for source address
 * selection. Used by ipif_select_source_v4/v6.
 */
#define MAX_IPIF_SELECT_SOURCE  50

#ifdef IP_DEBUG
/*
 * Trace refholds and refreles for debugging.
 */
#define TR_STACK_DEPTH  14
typedef struct tr_buf_s {
        int     tr_depth;
        clock_t tr_time;
        pc_t    tr_stack[TR_STACK_DEPTH];
} tr_buf_t;

typedef struct th_trace_s {
        int             th_refcnt;
        uint_t          th_trace_lastref;
        kthread_t       *th_id;
#define TR_BUF_MAX      38
        tr_buf_t        th_trbuf[TR_BUF_MAX];
} th_trace_t;

typedef struct th_hash_s {
        list_node_t     thh_link;
        mod_hash_t      *thh_hash;
        ip_stack_t      *thh_ipst;
} th_hash_t;
#endif

/* The following are ipif_state_flags */
#define IPIF_CONDEMNED          0x1     /* The ipif is being removed */
#define IPIF_CHANGING           0x2     /* A critcal ipif field is changing */
#define IPIF_SET_LINKLOCAL      0x10    /* transient flag during bringup */

/* IP interface structure, one per local address */
typedef struct ipif_s {
        struct  ipif_s  *ipif_next;
        struct  ill_s   *ipif_ill;      /* Back pointer to our ill */
        int     ipif_id;                /* Logical unit number */
        in6_addr_t ipif_v6lcl_addr;     /* Local IP address for this if. */
        in6_addr_t ipif_v6subnet;       /* Subnet prefix for this if. */
        in6_addr_t ipif_v6net_mask;     /* Net mask for this interface. */
        in6_addr_t ipif_v6brd_addr;     /* Broadcast addr for this interface. */
        in6_addr_t ipif_v6pp_dst_addr;  /* Point-to-point dest address. */
        uint64_t ipif_flags;            /* Interface flags. */
        uint_t  ipif_ire_type;          /* IRE_LOCAL or IRE_LOOPBACK */

        /*
         * The packet count in the ipif contain the sum of the
         * packet counts in dead IRE_LOCAL/LOOPBACK for this ipif.
         */
        uint_t  ipif_ib_pkt_count;      /* Inbound packets for our dead IREs */

        /* Exclusive bit fields, protected by ipsq_t */
        unsigned int
                ipif_was_up : 1,        /* ipif was up before */
                ipif_addr_ready : 1,    /* DAD is done */
                ipif_was_dup : 1,       /* DAD had failed */
                ipif_added_nce : 1,     /* nce added for local address */

                ipif_pad_to_31 : 28;

        ilm_t   *ipif_allhosts_ilm;     /* For all-nodes join */
        ilm_t   *ipif_solmulti_ilm;     /* For IPv6 solicited multicast join */

        uint_t  ipif_seqid;             /* unique index across all ills */
        uint_t  ipif_state_flags;       /* See IPIF_* flag defs above */
        uint_t  ipif_refcnt;            /* active consistent reader cnt */

        zoneid_t ipif_zoneid;           /* zone ID number */
        timeout_id_t ipif_recovery_id;  /* Timer for DAD recovery */
        boolean_t ipif_trace_disable;   /* True when alloc fails */
        /*
         * For an IPMP interface, ipif_bound_ill tracks the ill whose hardware
         * information this ipif is associated with via ARP/NDP.  We can use
         * an ill pointer (rather than an index) because only ills that are
         * part of a group will be pointed to, and an ill cannot disappear
         * while it's in a group.
         */
        struct ill_s    *ipif_bound_ill;
        struct ipif_s   *ipif_bound_next; /* bound ipif chain */
        boolean_t       ipif_bound;     /* B_TRUE if we successfully bound */

        struct ire_s    *ipif_ire_local; /* Our IRE_LOCAL or LOOPBACK */
        struct ire_s    *ipif_ire_if;    /* Our IRE_INTERFACE */
} ipif_t;

/*
 * The following table lists the protection levels of the various members
 * of the ipif_t. The following notation is used.
 *
 * Write once - Written to only once at the time of bringing up
 * the interface and can be safely read after the bringup without any lock.
 *
 * ipsq - Need to execute in the ipsq to perform the indicated access.
 *
 * ill_lock - Need to hold this mutex to perform the indicated access.
 *
 * ill_g_lock - Need to hold this rw lock as reader/writer for read access or
 * write access respectively.
 *
 * down ill - Written to only when the ill is down (i.e all ipifs are down)
 * up ill - Read only when the ill is up (i.e. at least 1 ipif is up)
 *
 *               Table of ipif_t members and their protection
 *
 * ipif_next            ipsq + ill_lock +       ipsq OR ill_lock OR
 *                      ill_g_lock              ill_g_lock
 * ipif_ill             ipsq + down ipif        write once
 * ipif_id              ipsq + down ipif        write once
 * ipif_v6lcl_addr      ipsq + down ipif        up ipif
 * ipif_v6subnet        ipsq + down ipif        up ipif
 * ipif_v6net_mask      ipsq + down ipif        up ipif
 *
 * ipif_v6brd_addr
 * ipif_v6pp_dst_addr
 * ipif_flags           ill_lock                ill_lock
 * ipif_ire_type        ipsq + down ill         up ill
 *
 * ipif_ib_pkt_count    Approx
 *
 * bit fields           ill_lock                ill_lock
 *
 * ipif_allhosts_ilm    ipsq                    ipsq
 * ipif_solmulti_ilm    ipsq                    ipsq
 *
 * ipif_seqid           ipsq                    Write once
 *
 * ipif_state_flags     ill_lock                ill_lock
 * ipif_refcnt          ill_lock                ill_lock
 * ipif_bound_ill       ipsq + ipmp_lock        ipsq OR ipmp_lock
 * ipif_bound_next      ipsq                    ipsq
 * ipif_bound           ipsq                    ipsq
 *
 * ipif_ire_local       ipsq + ips_ill_g_lock   ipsq OR ips_ill_g_lock
 * ipif_ire_if          ipsq + ips_ill_g_lock   ipsq OR ips_ill_g_lock
 */

/*
 * Return values from ip_laddr_verify_{v4,v6}
 */
typedef enum { IPVL_UNICAST_UP, IPVL_UNICAST_DOWN, IPVL_MCAST, IPVL_BCAST,
            IPVL_BAD} ip_laddr_t;


#define IP_TR_HASH(tid) ((((uintptr_t)tid) >> 6) & (IP_TR_HASH_MAX - 1))

#ifdef DEBUG
#define IPIF_TRACE_REF(ipif)    ipif_trace_ref(ipif)
#define ILL_TRACE_REF(ill)      ill_trace_ref(ill)
#define IPIF_UNTRACE_REF(ipif)  ipif_untrace_ref(ipif)
#define ILL_UNTRACE_REF(ill)    ill_untrace_ref(ill)
#else
#define IPIF_TRACE_REF(ipif)
#define ILL_TRACE_REF(ill)
#define IPIF_UNTRACE_REF(ipif)
#define ILL_UNTRACE_REF(ill)
#endif

/* IPv4 compatibility macros */
#define ipif_lcl_addr           V4_PART_OF_V6(ipif_v6lcl_addr)
#define ipif_subnet             V4_PART_OF_V6(ipif_v6subnet)
#define ipif_net_mask           V4_PART_OF_V6(ipif_v6net_mask)
#define ipif_brd_addr           V4_PART_OF_V6(ipif_v6brd_addr)
#define ipif_pp_dst_addr        V4_PART_OF_V6(ipif_v6pp_dst_addr)

/* Macros for easy backreferences to the ill. */
#define ipif_isv6               ipif_ill->ill_isv6

#define SIOCLIFADDR_NDX 112     /* ndx of SIOCLIFADDR in the ndx ioctl table */

/*
 * mode value for ip_ioctl_finish for finishing an ioctl
 */
#define CONN_CLOSE      1               /* No mi_copy */
#define COPYOUT         2               /* do an mi_copyout if needed */
#define NO_COPYOUT      3               /* do an mi_copy_done */
#define IPI2MODE(ipi)   ((ipi)->ipi_flags & IPI_GET_CMD ? COPYOUT : NO_COPYOUT)

/*
 * The IP-MT design revolves around the serialization objects ipsq_t (IPSQ)
 * and ipxop_t (exclusive operation or "xop").  Becoming "writer" on an IPSQ
 * ensures that no other threads can become "writer" on any IPSQs sharing that
 * IPSQ's xop until the writer thread is done.
 *
 * Each phyint points to one IPSQ that remains fixed over the phyint's life.
 * Each IPSQ points to one xop that can change over the IPSQ's life.  If a
 * phyint is *not* in an IPMP group, then its IPSQ will refer to the IPSQ's
 * "own" xop (ipsq_ownxop).  If a phyint *is* part of an IPMP group, then its
 * IPSQ will refer to the "group" xop, which is shorthand for the xop of the
 * IPSQ of the IPMP meta-interface's phyint.  Thus, all phyints that are part
 * of the same IPMP group will have their IPSQ's point to the group xop, and
 * thus becoming "writer" on any phyint in the group will prevent any other
 * writer on any other phyint in the group.  All IPSQs sharing the same xop
 * are chained together through ipsq_next (in the degenerate common case,
 * ipsq_next simply refers to itself).  Note that the group xop is guaranteed
 * to exist at least as long as there are members in the group, since the IPMP
 * meta-interface can only be destroyed if the group is empty.
 *
 * Incoming exclusive operation requests are enqueued on the IPSQ they arrived
 * on rather than the xop.  This makes switching xop's (as would happen when a
 * phyint leaves an IPMP group) simple, because after the phyint leaves the
 * group, any operations enqueued on its IPSQ can be safely processed with
 * respect to its new xop, and any operations enqueued on the IPSQs of its
 * former group can be processed with respect to their existing group xop.
 * Even so, switching xops is a subtle dance; see ipsq_dq() for details.
 *
 * An IPSQ's "own" xop is embedded within the IPSQ itself since they have have
 * identical lifetimes, and because doing so simplifies pointer management.
 * While each phyint and IPSQ point to each other, it is not possible to free
 * the IPSQ when the phyint is freed, since we may still *inside* the IPSQ
 * when the phyint is being freed.  Thus, ipsq_phyint is set to NULL when the
 * phyint is freed, and the IPSQ free is later done in ipsq_exit().
 *
 * ipsq_t synchronization:      read                    write
 *
 *      ipsq_xopq_mphead        ipx_lock                ipx_lock
 *      ipsq_xopq_mptail        ipx_lock                ipx_lock
 *      ipsq_xop_switch_mp      ipsq_lock               ipsq_lock
 *      ipsq_phyint             write once              write once
 *      ipsq_next               RW_READER ill_g_lock    RW_WRITER ill_g_lock
 *      ipsq_xop                ipsq_lock or ipsq       ipsq_lock + ipsq
 *      ipsq_swxop              ipsq                    ipsq
 *      ipsq_ownxop             see ipxop_t             see ipxop_t
 *      ipsq_ipst               write once              write once
 *
 * ipxop_t synchronization:     read                    write
 *
 *      ipx_writer              ipx_lock                ipx_lock
 *      ipx_xop_queued          ipx_lock                ipx_lock
 *      ipx_mphead              ipx_lock                ipx_lock
 *      ipx_mptail              ipx_lock                ipx_lock
 *      ipx_ipsq                write once              write once
 *      ips_ipsq_queued         ipx_lock                ipx_lock
 *      ipx_waitfor             ipsq or ipx_lock        ipsq + ipx_lock
 *      ipx_reentry_cnt         ipsq or ipx_lock        ipsq + ipx_lock
 *      ipx_current_done        ipsq                    ipsq
 *      ipx_current_ioctl       ipsq                    ipsq
 *      ipx_current_ipif        ipsq or ipx_lock        ipsq + ipx_lock
 *      ipx_pending_ipif        ipsq or ipx_lock        ipsq + ipx_lock
 *      ipx_pending_mp          ipsq or ipx_lock        ipsq + ipx_lock
 *      ipx_forced              ipsq                    ipsq
 *      ipx_depth               ipsq                    ipsq
 *      ipx_stack               ipsq                    ipsq
 */
typedef struct ipxop_s {
        kmutex_t        ipx_lock;       /* see above */
        kthread_t       *ipx_writer;    /* current owner */
        mblk_t          *ipx_mphead;    /* messages tied to this op */
        mblk_t          *ipx_mptail;
        struct ipsq_s   *ipx_ipsq;      /* associated ipsq */
        boolean_t       ipx_ipsq_queued; /* ipsq using xop has queued op */
        int             ipx_waitfor;    /* waiting; values encoded below */
        int             ipx_reentry_cnt;
        boolean_t       ipx_current_done;  /* is the current operation done? */
        int             ipx_current_ioctl; /* current ioctl, or 0 if no ioctl */
        ipif_t          *ipx_current_ipif; /* ipif for current op */
        ipif_t          *ipx_pending_ipif; /* ipif for ipx_pending_mp */
        mblk_t          *ipx_pending_mp; /* current ioctl mp while waiting */
        boolean_t       ipx_forced;                     /* debugging aid */
#ifdef DEBUG
        int             ipx_depth;                      /* debugging aid */
#define IPX_STACK_DEPTH 15
        pc_t            ipx_stack[IPX_STACK_DEPTH];     /* debugging aid */
#endif
} ipxop_t;

typedef struct ipsq_s {
        kmutex_t ipsq_lock;             /* see above */
        mblk_t  *ipsq_switch_mp;        /* op to handle right after switch */
        mblk_t  *ipsq_xopq_mphead;      /* list of excl ops (mostly ioctls) */
        mblk_t  *ipsq_xopq_mptail;
        struct phyint   *ipsq_phyint;   /* associated phyint */
        struct ipsq_s   *ipsq_next;     /* next ipsq sharing ipsq_xop */
        struct ipxop_s  *ipsq_xop;      /* current xop synchronization info */
        struct ipxop_s  *ipsq_swxop;    /* switch xop to on ipsq_exit() */
        struct ipxop_s  ipsq_ownxop;    /* our own xop (may not be in-use) */
        ip_stack_t      *ipsq_ipst;     /* does not have a netstack_hold */
} ipsq_t;

/*
 * ipx_waitfor values:
 */
enum {
        IPIF_DOWN = 1,  /* ipif_down() waiting for refcnts to drop */
        ILL_DOWN,       /* ill_down() waiting for refcnts to drop */
        IPIF_FREE,      /* ipif_free() waiting for refcnts to drop */
        ILL_FREE        /* ill unplumb waiting for refcnts to drop */
};

/* Operation types for ipsq_try_enter() */
#define CUR_OP 0        /* request writer within current operation */
#define NEW_OP 1        /* request writer for a new operation */
#define SWITCH_OP 2     /* request writer once IPSQ XOP switches */

/*
 * Kstats tracked on each IPMP meta-interface.  Order here must match
 * ipmp_kstats[] in ip/ipmp.c.
 */
enum {
        IPMP_KSTAT_OBYTES,      IPMP_KSTAT_OBYTES64,    IPMP_KSTAT_RBYTES,
        IPMP_KSTAT_RBYTES64,    IPMP_KSTAT_OPACKETS,    IPMP_KSTAT_OPACKETS64,
        IPMP_KSTAT_OERRORS,     IPMP_KSTAT_IPACKETS,    IPMP_KSTAT_IPACKETS64,
        IPMP_KSTAT_IERRORS,     IPMP_KSTAT_MULTIRCV,    IPMP_KSTAT_MULTIXMT,
        IPMP_KSTAT_BRDCSTRCV,   IPMP_KSTAT_BRDCSTXMT,   IPMP_KSTAT_LINK_UP,
        IPMP_KSTAT_MAX          /* keep last */
};

/*
 * phyint represents state that is common to both IPv4 and IPv6 interfaces.
 * There is a separate ill_t representing IPv4 and IPv6 which has a
 * backpointer to the phyint structure for accessing common state.
 */
typedef struct phyint {
        struct ill_s    *phyint_illv4;
        struct ill_s    *phyint_illv6;
        uint_t          phyint_ifindex;         /* SIOCSLIFINDEX */
        uint64_t        phyint_flags;
        avl_node_t      phyint_avl_by_index;    /* avl tree by index */
        avl_node_t      phyint_avl_by_name;     /* avl tree by name */
        kmutex_t        phyint_lock;
        struct ipsq_s   *phyint_ipsq;           /* back pointer to ipsq */
        struct ipmp_grp_s *phyint_grp;          /* associated IPMP group */
        char            phyint_name[LIFNAMSIZ]; /* physical interface name */
        uint64_t        phyint_kstats0[IPMP_KSTAT_MAX]; /* baseline kstats */
} phyint_t;

#define CACHE_ALIGN_SIZE 64
#define CACHE_ALIGN(align_struct)       P2ROUNDUP(sizeof (struct align_struct),\
                                                        CACHE_ALIGN_SIZE)
struct _phyint_list_s_ {
        avl_tree_t      phyint_list_avl_by_index;       /* avl tree by index */
        avl_tree_t      phyint_list_avl_by_name;        /* avl tree by name */
};

typedef union phyint_list_u {
        struct  _phyint_list_s_ phyint_list_s;
        char    phyint_list_filler[CACHE_ALIGN(_phyint_list_s_)];
} phyint_list_t;

#define phyint_list_avl_by_index        phyint_list_s.phyint_list_avl_by_index
#define phyint_list_avl_by_name         phyint_list_s.phyint_list_avl_by_name

/*
 * Fragmentation hash bucket
 */
typedef struct ipfb_s {
        struct ipf_s    *ipfb_ipf;      /* List of ... */
        size_t          ipfb_count;     /* Count of bytes used by frag(s) */
        kmutex_t        ipfb_lock;      /* Protect all ipf in list */
        uint_t          ipfb_frag_pkts; /* num of distinct fragmented pkts */
} ipfb_t;

/*
 * IRE bucket structure. Usually there is an array of such structures,
 * each pointing to a linked list of ires. irb_refcnt counts the number
 * of walkers of a given hash bucket. Usually the reference count is
 * bumped up if the walker wants no IRES to be DELETED while walking the
 * list. Bumping up does not PREVENT ADDITION. This allows walking a given
 * hash bucket without stumbling up on a free pointer.
 *
 * irb_t structures in ip_ftable are dynamically allocated and freed.
 * In order to identify the irb_t structures that can be safely kmem_free'd
 * we need to ensure that
 *  - the irb_refcnt is quiescent, indicating no other walkers,
 *  - no other threads or ire's are holding references to the irb,
 *      i.e., irb_nire == 0,
 *  - there are no active ire's in the bucket, i.e., irb_ire_cnt == 0
 */
typedef struct irb {
        struct ire_s    *irb_ire;       /* First ire in this bucket */
                                        /* Should be first in this struct */
        krwlock_t       irb_lock;       /* Protect this bucket */
        uint_t          irb_refcnt;     /* Protected by irb_lock */
        uchar_t         irb_marks;      /* CONDEMNED ires in this bucket ? */
#define IRB_MARK_CONDEMNED      0x0001  /* Contains some IRE_IS_CONDEMNED */
#define IRB_MARK_DYNAMIC        0x0002  /* Dynamically allocated */
        /* Once IPv6 uses radix then IRB_MARK_DYNAMIC will be always be set */
        uint_t          irb_ire_cnt;    /* Num of active IRE in this bucket */
        int             irb_nire;       /* Num of ftable ire's that ref irb */
        ip_stack_t      *irb_ipst;      /* Does not have a netstack_hold */
} irb_t;

/*
 * This is the structure used to store the multicast physical addresses
 * that an interface has joined.
 * The refcnt keeps track of the number of multicast IP addresses mapping
 * to a physical multicast address.
 */
typedef struct multiphysaddr_s {
        struct  multiphysaddr_s  *mpa_next;
        char    mpa_addr[IP_MAX_HW_LEN];
        int     mpa_refcnt;
} multiphysaddr_t;

#define IRB2RT(irb)     (rt_t *)((caddr_t)(irb) - offsetof(rt_t, rt_irb))

/* Forward declarations */
struct dce_s;
typedef struct dce_s dce_t;
struct ire_s;
typedef struct ire_s ire_t;
struct ncec_s;
typedef struct ncec_s ncec_t;
struct nce_s;
typedef struct nce_s nce_t;
struct ip_recv_attr_s;
typedef struct ip_recv_attr_s ip_recv_attr_t;
struct ip_xmit_attr_s;
typedef struct ip_xmit_attr_s ip_xmit_attr_t;

struct tsol_ire_gw_secattr_s;
typedef struct tsol_ire_gw_secattr_s tsol_ire_gw_secattr_t;

/*
 * This is a structure for a one-element route cache that is passed
 * by reference between ip_input and ill_inputfn.
 */
typedef struct {
        ire_t           *rtc_ire;
        ipaddr_t        rtc_ipaddr;
        in6_addr_t      rtc_ip6addr;
} rtc_t;

/*
 * Note: Temporarily use 64 bits, and will probably go back to 32 bits after
 * more cleanup work is done.
 */
typedef uint64_t iaflags_t;

/* The ill input function pointer type */
typedef void (*pfillinput_t)(mblk_t *, void *, void *, ip_recv_attr_t *,
    rtc_t *);

/* The ire receive function pointer type */
typedef void (*pfirerecv_t)(ire_t *, mblk_t *, void *, ip_recv_attr_t *);

/* The ire send and postfrag function pointer types */
typedef int (*pfiresend_t)(ire_t *, mblk_t *, void *,
    ip_xmit_attr_t *, uint32_t *);
typedef int (*pfirepostfrag_t)(mblk_t *, nce_t *, iaflags_t, uint_t, uint32_t,
    zoneid_t, zoneid_t, uintptr_t *);


#define IP_V4_G_HEAD    0
#define IP_V6_G_HEAD    1

#define MAX_G_HEADS     2

/*
 * unpadded ill_if structure
 */
struct  _ill_if_s_ {
        union ill_if_u  *illif_next;
        union ill_if_u  *illif_prev;
        avl_tree_t      illif_avl_by_ppa;       /* AVL tree sorted on ppa */
        vmem_t          *illif_ppa_arena;       /* ppa index space */
        uint16_t        illif_mcast_v1;         /* hints for              */
        uint16_t        illif_mcast_v2;         /* [igmp|mld]_slowtimo    */
        int             illif_name_len;         /* name length */
        char            illif_name[LIFNAMSIZ];  /* name of interface type */
};

/* cache aligned ill_if structure */
typedef union   ill_if_u {
        struct  _ill_if_s_ ill_if_s;
        char    illif_filler[CACHE_ALIGN(_ill_if_s_)];
} ill_if_t;

#define illif_next              ill_if_s.illif_next
#define illif_prev              ill_if_s.illif_prev
#define illif_avl_by_ppa        ill_if_s.illif_avl_by_ppa
#define illif_ppa_arena         ill_if_s.illif_ppa_arena
#define illif_mcast_v1          ill_if_s.illif_mcast_v1
#define illif_mcast_v2          ill_if_s.illif_mcast_v2
#define illif_name              ill_if_s.illif_name
#define illif_name_len          ill_if_s.illif_name_len

typedef struct ill_walk_context_s {
        int     ctx_current_list; /* current list being searched */
        int     ctx_last_list;   /* last list to search */
} ill_walk_context_t;

/*
 * ill_g_heads structure, one for IPV4 and one for IPV6
 */
struct _ill_g_head_s_ {
        ill_if_t        *ill_g_list_head;
        ill_if_t        *ill_g_list_tail;
};

typedef union ill_g_head_u {
        struct _ill_g_head_s_ ill_g_head_s;
        char    ill_g_head_filler[CACHE_ALIGN(_ill_g_head_s_)];
} ill_g_head_t;

#define ill_g_list_head ill_g_head_s.ill_g_list_head
#define ill_g_list_tail ill_g_head_s.ill_g_list_tail

#define IP_V4_ILL_G_LIST(ipst)  \
        (ipst)->ips_ill_g_heads[IP_V4_G_HEAD].ill_g_list_head
#define IP_V6_ILL_G_LIST(ipst)  \
        (ipst)->ips_ill_g_heads[IP_V6_G_HEAD].ill_g_list_head
#define IP_VX_ILL_G_LIST(i, ipst)       \
        (ipst)->ips_ill_g_heads[i].ill_g_list_head

#define ILL_START_WALK_V4(ctx_ptr, ipst)        \
        ill_first(IP_V4_G_HEAD, IP_V4_G_HEAD, ctx_ptr, ipst)
#define ILL_START_WALK_V6(ctx_ptr, ipst)        \
        ill_first(IP_V6_G_HEAD, IP_V6_G_HEAD, ctx_ptr, ipst)
#define ILL_START_WALK_ALL(ctx_ptr, ipst)       \
        ill_first(MAX_G_HEADS, MAX_G_HEADS, ctx_ptr, ipst)

/*
 * Capabilities, possible flags for ill_capabilities.
 */
#define ILL_CAPAB_LSO           0x04            /* Large Send Offload */
#define ILL_CAPAB_HCKSUM        0x08            /* Hardware checksumming */
#define ILL_CAPAB_ZEROCOPY      0x10            /* Zero-copy */
#define ILL_CAPAB_DLD           0x20            /* DLD capabilities */
#define ILL_CAPAB_DLD_POLL      0x40            /* Polling */
#define ILL_CAPAB_DLD_DIRECT    0x80            /* Direct function call */

/*
 * Per-ill Hardware Checksumming capbilities.
 */
typedef struct ill_hcksum_capab_s ill_hcksum_capab_t;

/*
 * Per-ill Zero-copy capabilities.
 */
typedef struct ill_zerocopy_capab_s ill_zerocopy_capab_t;

/*
 * DLD capbilities.
 */
typedef struct ill_dld_capab_s ill_dld_capab_t;

/*
 * Per-ill polling resource map.
 */
typedef struct ill_rx_ring ill_rx_ring_t;

/*
 * Per-ill Large Send Offload capabilities.
 */
typedef struct ill_lso_capab_s ill_lso_capab_t;

/* The following are ill_state_flags */
#define ILL_LL_SUBNET_PENDING   0x01    /* Waiting for DL_INFO_ACK from drv */
#define ILL_CONDEMNED           0x02    /* No more new ref's to the ILL */
#define ILL_DL_UNBIND_IN_PROGRESS       0x04    /* UNBIND_REQ is sent */
/*
 * ILL_DOWN_IN_PROGRESS is set to ensure the following:
 * - no packets are sent to the driver after the DL_UNBIND_REQ is sent,
 * - no longstanding references will be acquired on objects that are being
 *   brought down.
 */
#define ILL_DOWN_IN_PROGRESS    0x08

/* Is this an ILL whose source address is used by other ILL's ? */
#define IS_USESRC_ILL(ill)                      \
        (((ill)->ill_usesrc_ifindex == 0) &&    \
        ((ill)->ill_usesrc_grp_next != NULL))

/* Is this a client/consumer of the usesrc ILL ? */
#define IS_USESRC_CLI_ILL(ill)                  \
        (((ill)->ill_usesrc_ifindex != 0) &&    \
        ((ill)->ill_usesrc_grp_next != NULL))

/* Is this an virtual network interface (vni) ILL ? */
#define IS_VNI(ill)                                                     \
        (((ill)->ill_phyint->phyint_flags & (PHYI_LOOPBACK|PHYI_VIRTUAL)) == \
        PHYI_VIRTUAL)

/* Is this a loopback ILL? */
#define IS_LOOPBACK(ill) \
        ((ill)->ill_phyint->phyint_flags & PHYI_LOOPBACK)

/* Is this an IPMP meta-interface ILL? */
#define IS_IPMP(ill)                                                    \
        ((ill)->ill_phyint->phyint_flags & PHYI_IPMP)

/* Is this ILL under an IPMP meta-interface? (aka "in a group?") */
#define IS_UNDER_IPMP(ill)                                              \
        ((ill)->ill_grp != NULL && !IS_IPMP(ill))

/* Is ill1 in the same illgrp as ill2? */
#define IS_IN_SAME_ILLGRP(ill1, ill2)                                   \
        ((ill1)->ill_grp != NULL && ((ill1)->ill_grp == (ill2)->ill_grp))

/* Is ill1 on the same LAN as ill2? */
#define IS_ON_SAME_LAN(ill1, ill2)                                      \
        ((ill1) == (ill2) || IS_IN_SAME_ILLGRP(ill1, ill2))

#define ILL_OTHER(ill)                                                  \
        ((ill)->ill_isv6 ? (ill)->ill_phyint->phyint_illv4 :            \
            (ill)->ill_phyint->phyint_illv6)

/*
 * IPMP group ILL state structure -- up to two per IPMP group (V4 and V6).
 * Created when the V4 and/or V6 IPMP meta-interface is I_PLINK'd.  It is
 * guaranteed to persist while there are interfaces of that type in the group.
 * In general, most fields are accessed outside of the IPSQ (e.g., in the
 * datapath), and thus use locks in addition to the IPSQ for protection.
 *
 * synchronization:             read                    write
 *
 *      ig_if                   ipsq or ill_g_lock      ipsq and ill_g_lock
 *      ig_actif                ipsq or ipmp_lock       ipsq and ipmp_lock
 *      ig_nactif               ipsq or ipmp_lock       ipsq and ipmp_lock
 *      ig_next_ill             ipsq or ipmp_lock       ipsq and ipmp_lock
 *      ig_ipmp_ill             write once              write once
 *      ig_cast_ill             ipsq or ipmp_lock       ipsq and ipmp_lock
 *      ig_arpent               ipsq                    ipsq
 *      ig_mtu                  ipsq                    ipsq
 *      ig_mc_mtu               ipsq                    ipsq
 */
typedef struct ipmp_illgrp_s {
        list_t          ig_if;          /* list of all interfaces */
        list_t          ig_actif;       /* list of active interfaces */
        uint_t          ig_nactif;      /* number of active interfaces */
        struct ill_s    *ig_next_ill;   /* next active interface to use */
        struct ill_s    *ig_ipmp_ill;   /* backpointer to IPMP meta-interface */
        struct ill_s    *ig_cast_ill;   /* nominated ill for multi/broadcast */
        list_t          ig_arpent;      /* list of ARP entries */
        uint_t          ig_mtu;         /* ig_ipmp_ill->ill_mtu */
        uint_t          ig_mc_mtu;      /* ig_ipmp_ill->ill_mc_mtu */
} ipmp_illgrp_t;

/*
 * IPMP group state structure -- one per IPMP group.  Created when the
 * IPMP meta-interface is plumbed; it is guaranteed to persist while there
 * are interfaces in it.
 *
 * ipmp_grp_t synchronization:          read                    write
 *
 *      gr_name                         ipmp_lock               ipmp_lock
 *      gr_ifname                       write once              write once
 *      gr_mactype                      ipmp_lock               ipmp_lock
 *      gr_phyint                       write once              write once
 *      gr_nif                          ipmp_lock               ipmp_lock
 *      gr_nactif                       ipsq                    ipsq
 *      gr_v4                           ipmp_lock               ipmp_lock
 *      gr_v6                           ipmp_lock               ipmp_lock
 *      gr_nv4                          ipmp_lock               ipmp_lock
 *      gr_nv6                          ipmp_lock               ipmp_lock
 *      gr_pendv4                       ipmp_lock               ipmp_lock
 *      gr_pendv6                       ipmp_lock               ipmp_lock
 *      gr_linkdownmp                   ipsq                    ipsq
 *      gr_ksp                          ipmp_lock               ipmp_lock
 *      gr_kstats0                      atomic                  atomic
 */
typedef struct ipmp_grp_s {
        char            gr_name[LIFGRNAMSIZ];   /* group name */
        char            gr_ifname[LIFNAMSIZ];   /* interface name */
        t_uscalar_t     gr_mactype;     /* DLPI mactype of group */
        phyint_t        *gr_phyint;     /* IPMP group phyint */
        uint_t          gr_nif;         /* number of interfaces in group */
        uint_t          gr_nactif;      /* number of active interfaces */
        ipmp_illgrp_t   *gr_v4;         /* V4 group information */
        ipmp_illgrp_t   *gr_v6;         /* V6 group information */
        uint_t          gr_nv4;         /* number of ills in V4 group */
        uint_t          gr_nv6;         /* number of ills in V6 group */
        uint_t          gr_pendv4;      /* number of pending ills in V4 group */
        uint_t          gr_pendv6;      /* number of pending ills in V6 group */
        mblk_t          *gr_linkdownmp; /* message used to bring link down */
        kstat_t         *gr_ksp;        /* group kstat pointer */
        uint64_t        gr_kstats0[IPMP_KSTAT_MAX]; /* baseline group kstats */
} ipmp_grp_t;

/*
 * IPMP ARP entry -- one per SIOCS*ARP entry tied to the group.  Used to keep
 * ARP up-to-date as the active set of interfaces in the group changes.
 */
typedef struct ipmp_arpent_s {
        ipaddr_t        ia_ipaddr;      /* IP address for this entry */
        boolean_t       ia_proxyarp;    /* proxy ARP entry? */
        boolean_t       ia_notified;    /* ARP notified about this entry? */
        list_node_t     ia_node;        /* next ARP entry in list */
        uint16_t        ia_flags;       /* nce_flags for the address */
        size_t          ia_lladdr_len;
        uchar_t         *ia_lladdr;
} ipmp_arpent_t;

struct arl_s;

/*
 * Per-ill capabilities.
 */
struct ill_hcksum_capab_s {
        uint_t  ill_hcksum_version;     /* interface version */
        uint_t  ill_hcksum_txflags;     /* capabilities on transmit */
};

struct ill_zerocopy_capab_s {
        uint_t  ill_zerocopy_version;   /* interface version */
        uint_t  ill_zerocopy_flags;     /* capabilities */
};

struct ill_lso_capab_s {
        uint_t  ill_lso_flags;          /* capabilities */
        uint_t  ill_lso_max_tcpv4;      /* maximum size of payload */
        uint_t  ill_lso_max_tcpv6;      /* maximum size of payload */
};

/*
 * IP Lower level Structure.
 * Instance data structure in ip_open when there is a device below us.
 */
typedef struct ill_s {
        pfillinput_t ill_inputfn;       /* Fast input function selector */
        ill_if_t *ill_ifptr;            /* pointer to interface type */
        queue_t *ill_rq;                /* Read queue. */
        queue_t *ill_wq;                /* Write queue. */

        int     ill_error;              /* Error value sent up by device. */

        ipif_t  *ill_ipif;              /* Interface chain for this ILL. */

        uint_t  ill_ipif_up_count;      /* Number of IPIFs currently up. */
        uint_t  ill_max_frag;           /* Max IDU from DLPI. */
        uint_t  ill_current_frag;       /* Current IDU from DLPI. */
        uint_t  ill_mtu;                /* User-specified MTU; SIOCSLIFMTU */
        uint_t  ill_mc_mtu;             /* MTU for multi/broadcast */
        uint_t  ill_metric;             /* BSD if metric, for compatibility. */
        char    *ill_name;              /* Our name. */
        uint_t  ill_ipif_dup_count;     /* Number of duplicate addresses. */
        uint_t  ill_name_length;        /* Name length, incl. terminator. */
        uint_t  ill_net_type;           /* IRE_IF_RESOLVER/IRE_IF_NORESOLVER. */
        /*
         * Physical Point of Attachment num.  If DLPI style 1 provider
         * then this is derived from the devname.
         */
        uint_t  ill_ppa;
        t_uscalar_t     ill_sap;
        t_scalar_t      ill_sap_length; /* Including sign (for position) */
        uint_t  ill_phys_addr_length;   /* Excluding the sap. */
        uint_t  ill_bcast_addr_length;  /* Only set when the DL provider */
                                        /* supports broadcast. */
        t_uscalar_t     ill_mactype;
        uint8_t *ill_frag_ptr;          /* Reassembly state. */
        timeout_id_t ill_frag_timer_id; /* timeout id for the frag timer */
        ipfb_t  *ill_frag_hash_tbl;     /* Fragment hash list head. */

        krwlock_t ill_mcast_lock;       /* Protects multicast state */
        kmutex_t ill_mcast_serializer;  /* Serialize across ilg and ilm state */
        ilm_t   *ill_ilm;               /* Multicast membership for ill */
        uint_t  ill_global_timer;       /* for IGMPv3/MLDv2 general queries */
        int     ill_mcast_type;         /* type of router which is querier */
                                        /* on this interface */
        uint16_t ill_mcast_v1_time;     /* # slow timeouts since last v1 qry */
        uint16_t ill_mcast_v2_time;     /* # slow timeouts since last v2 qry */
        uint8_t ill_mcast_v1_tset;      /* 1 => timer is set; 0 => not set */
        uint8_t ill_mcast_v2_tset;      /* 1 => timer is set; 0 => not set */

        uint8_t ill_mcast_rv;           /* IGMPv3/MLDv2 robustness variable */
        int     ill_mcast_qi;           /* IGMPv3/MLDv2 query interval var */

        /*
         * All non-NULL cells between 'ill_first_mp_to_free' and
         * 'ill_last_mp_to_free' are freed in ill_delete.
         */
#define ill_first_mp_to_free    ill_bcast_mp
        mblk_t  *ill_bcast_mp;          /* DLPI header for broadcasts. */
        mblk_t  *ill_unbind_mp;         /* unbind mp from ill_dl_up() */
        mblk_t  *ill_promiscoff_mp;     /* for ill_leave_allmulti() */
        mblk_t  *ill_dlpi_deferred;     /* b_next chain of control messages */
        mblk_t  *ill_dest_addr_mp;      /* mblk which holds ill_dest_addr */
        mblk_t  *ill_replumb_mp;        /* replumb mp from ill_replumb() */
        mblk_t  *ill_phys_addr_mp;      /* mblk which holds ill_phys_addr */
        mblk_t  *ill_mcast_deferred;    /* b_next chain of IGMP/MLD packets */
#define ill_last_mp_to_free     ill_mcast_deferred

        cred_t  *ill_credp;             /* opener's credentials */
        uint8_t *ill_phys_addr;         /* ill_phys_addr_mp->b_rptr + off */
        uint8_t *ill_dest_addr;         /* ill_dest_addr_mp->b_rptr + off */

        uint_t  ill_state_flags;        /* see ILL_* flags above */

        /* Following bit fields protected by ipsq_t */
        uint_t
                ill_needs_attach : 1,
                ill_reserved : 1,
                ill_isv6 : 1,
                ill_dlpi_style_set : 1,

                ill_ifname_pending : 1,
                ill_logical_down : 1,
                ill_dl_up : 1,
                ill_up_ipifs : 1,

                ill_note_link : 1,      /* supports link-up notification */
                ill_capab_reneg : 1, /* capability renegotiation to be done */
                ill_dld_capab_inprog : 1, /* direct dld capab call in prog */
                ill_need_recover_multicast : 1,

                ill_replumbing : 1,
                ill_arl_dlpi_pending : 1,
                ill_grp_pending : 1,

                ill_pad_to_bit_31 : 17;

        /* Following bit fields protected by ill_lock */
        uint_t
                ill_fragtimer_executing : 1,
                ill_fragtimer_needrestart : 1,
                ill_manual_token : 1,   /* system won't override ill_token */
                /*
                 * ill_manual_linklocal : system will not change the
                 * linklocal whenever ill_token changes.
                 */
                ill_manual_linklocal : 1,

                ill_manual_dst_linklocal : 1, /* same for pt-pt dst linklocal */

                ill_mcast_ncec_cleanup : 1,     /* Reaping mcast ncecs. */
                ill_pad_bit_31 : 26;

        /*
         * Used in SIOCSIFMUXID and SIOCGIFMUXID for 'ifconfig unplumb'.
         */
        int     ill_muxid;              /* muxid returned from plink */

        /* Used for IP frag reassembly throttling on a per ILL basis.  */
        uint_t  ill_ipf_gen;            /* Generation of next fragment queue */
        uint_t  ill_frag_count;         /* Count of all reassembly mblk bytes */
        uint_t  ill_frag_free_num_pkts;  /* num of fragmented packets to free */
        clock_t ill_last_frag_clean_time; /* time when frag's were pruned */
        int     ill_type;               /* From <net/if_types.h> */
        uint_t  ill_dlpi_multicast_state;       /* See below IDS_* */
        uint_t  ill_dlpi_fastpath_state;        /* See below IDS_* */

        /*
         * Capabilities related fields.
         */
        uint_t  ill_dlpi_capab_state;   /* State of capability query, IDCS_* */
        uint_t  ill_capab_pending_cnt;
        uint64_t ill_capabilities;      /* Enabled capabilities, ILL_CAPAB_* */
        ill_hcksum_capab_t *ill_hcksum_capab; /* H/W cksumming capabilities */
        ill_zerocopy_capab_t *ill_zerocopy_capab; /* Zero-copy capabilities */
        ill_dld_capab_t *ill_dld_capab; /* DLD capabilities */
        ill_lso_capab_t *ill_lso_capab; /* Large Segment Offload capabilities */
        mblk_t  *ill_capab_reset_mp;    /* Preallocated mblk for capab reset */

        uint8_t ill_max_hops;   /* Maximum hops for any logical interface */
        uint_t  ill_user_mtu;   /* User-specified MTU via SIOCSLIFLNKINFO */
        uint32_t ill_reachable_time;    /* Value for ND algorithm in msec */
        uint32_t ill_reachable_retrans_time; /* Value for ND algorithm msec */
        uint_t  ill_max_buf;            /* Max # of req to buffer for ND */
        in6_addr_t      ill_token;      /* IPv6 interface id */
        in6_addr_t      ill_dest_token; /* Destination IPv6 interface id */
        uint_t          ill_token_length;
        uint32_t        ill_xmit_count;         /* ndp max multicast xmits */
        mib2_ipIfStatsEntry_t   *ill_ip_mib;    /* ver indep. interface mib */
        mib2_ipv6IfIcmpEntry_t  *ill_icmp6_mib; /* Per interface mib */

        phyint_t                *ill_phyint;
        uint64_t                ill_flags;

        kmutex_t        ill_lock;       /* Please see table below */
        /*
         * The ill_nd_lla* fields handle the link layer address option
         * from neighbor discovery. This is used for external IPv6
         * address resolution.
         */
        mblk_t          *ill_nd_lla_mp; /* mblk which holds ill_nd_lla */
        uint8_t         *ill_nd_lla;    /* Link Layer Address */
        uint_t          ill_nd_lla_len; /* Link Layer Address length */
        /*
         * We have 4 phys_addr_req's sent down. This field keeps track
         * of which one is pending.
         */
        t_uscalar_t     ill_phys_addr_pend; /* which dl_phys_addr_req pending */
        /*
         * Used to save errors that occur during plumbing
         */
        uint_t          ill_ifname_pending_err;
        avl_node_t      ill_avl_byppa; /* avl node based on ppa */
        uint_t          ill_mcast_nces; /* Number of NCEs that are multicast. */
        list_t          ill_nce; /* pointer to nce_s list */
        uint_t          ill_refcnt;     /* active refcnt by threads */
        uint_t          ill_ire_cnt;    /* ires associated with this ill */
        kcondvar_t      ill_cv;
        uint_t          ill_ncec_cnt;   /* ncecs associated with this ill */
        uint_t          ill_nce_cnt;    /* nces associated with this ill */
        uint_t          ill_waiters;    /* threads waiting in ipsq_enter */
        /*
         * Contains the upper read queue pointer of the module immediately
         * beneath IP.  This field allows IP to validate sub-capability
         * acknowledgments coming up from downstream.
         */
        queue_t         *ill_lmod_rq;   /* read queue pointer of module below */
        uint_t          ill_lmod_cnt;   /* number of modules beneath IP */
        ip_m_t          *ill_media;     /* media specific params/functions */
        t_uscalar_t     ill_dlpi_pending; /* Last DLPI primitive issued */
        uint_t          ill_usesrc_ifindex; /* use src addr from this ILL */
        struct ill_s    *ill_usesrc_grp_next; /* Next ILL in the usesrc group */
        boolean_t       ill_trace_disable;      /* True when alloc fails */
        zoneid_t        ill_zoneid;
        ip_stack_t      *ill_ipst;      /* Corresponds to a netstack_hold */
        uint32_t        ill_dhcpinit;   /* IP_DHCPINIT_IFs for ill */
        void            *ill_flownotify_mh; /* Tx flow ctl, mac cb handle */
        uint_t          ill_ilm_cnt;    /* ilms referencing this ill */
        uint_t          ill_ipallmulti_cnt; /* ip_join_allmulti() calls */
        ilm_t           *ill_ipallmulti_ilm;

        mblk_t          *ill_saved_ire_mp; /* Allocated for each extra IRE */
                                        /* with ire_ill set so they can */
                                        /* survive the ill going down and up. */
        kmutex_t        ill_saved_ire_lock; /* Protects ill_saved_ire_mp, cnt */
        uint_t          ill_saved_ire_cnt;      /* # entries */
        struct arl_ill_common_s    *ill_common;
        ire_t           *ill_ire_multicast; /* IRE_MULTICAST for ill */
        clock_t         ill_defend_start;   /* start of 1 hour period */
        uint_t          ill_defend_count;   /* # of announce/defends per ill */
        /*
         * IPMP fields.
         */
        ipmp_illgrp_t   *ill_grp;       /* IPMP group information */
        list_node_t     ill_actnode;    /* next active ill in group */
        list_node_t     ill_grpnode;    /* next ill in group */
        ipif_t          *ill_src_ipif;  /* source address selection rotor */
        ipif_t          *ill_move_ipif; /* ipif awaiting move to new ill */
        boolean_t       ill_nom_cast;   /* nominated for mcast/bcast */
        uint_t          ill_bound_cnt;  /* # of data addresses bound to ill */
        ipif_t          *ill_bound_ipif; /* ipif chain bound to ill */
        timeout_id_t    ill_refresh_tid; /* ill refresh retry timeout id */

        uint32_t        ill_mrouter_cnt; /* mrouter allmulti joins */
        uint32_t        ill_allowed_ips_cnt;
        in6_addr_t      *ill_allowed_ips;

        /* list of multicast physical addresses joined on this ill */
        multiphysaddr_t *ill_mphysaddr_list;
} ill_t;

/*
 * ILL_FREE_OK() means that there are no incoming pointer references
 * to the ill.
 */
#define ILL_FREE_OK(ill)                                        \
        ((ill)->ill_ire_cnt == 0 && (ill)->ill_ilm_cnt == 0 &&  \
        (ill)->ill_ncec_cnt == 0 && (ill)->ill_nce_cnt == 0)

/*
 * An ipif/ill can be marked down only when the ire and ncec references
 * to that ipif/ill goes to zero. ILL_DOWN_OK() is a necessary condition
 * quiescence checks. See comments above IPIF_DOWN_OK for details
 * on why ires and nces are selectively considered for this macro.
 */
#define ILL_DOWN_OK(ill)                                        \
        (ill->ill_ire_cnt == 0 && ill->ill_ncec_cnt == 0 &&     \
        ill->ill_nce_cnt == 0)

/*
 * The following table lists the protection levels of the various members
 * of the ill_t. Same notation as that used for ipif_t above is used.
 *
 *                              Write                   Read
 *
 * ill_ifptr                    ill_g_lock + s          Write once
 * ill_rq                       ipsq                    Write once
 * ill_wq                       ipsq                    Write once
 *
 * ill_error                    ipsq                    None
 * ill_ipif                     ill_g_lock + ipsq       ill_g_lock OR ipsq
 * ill_ipif_up_count            ill_lock + ipsq         ill_lock OR ipsq
 * ill_max_frag                 ill_lock                ill_lock
 * ill_current_frag             ill_lock                ill_lock
 *
 * ill_name                     ill_g_lock + ipsq       Write once
 * ill_name_length              ill_g_lock + ipsq       Write once
 * ill_ndd_name                 ipsq                    Write once
 * ill_net_type                 ipsq                    Write once
 * ill_ppa                      ill_g_lock + ipsq       Write once
 * ill_sap                      ipsq + down ill         Write once
 * ill_sap_length               ipsq + down ill         Write once
 * ill_phys_addr_length         ipsq + down ill         Write once
 *
 * ill_bcast_addr_length        ipsq                    ipsq
 * ill_mactype                  ipsq                    ipsq
 * ill_frag_ptr                 ipsq                    ipsq
 *
 * ill_frag_timer_id            ill_lock                ill_lock
 * ill_frag_hash_tbl            ipsq                    up ill
 * ill_ilm                      ill_mcast_lock(WRITER)  ill_mcast_lock(READER)
 * ill_global_timer             ill_mcast_lock(WRITER)  ill_mcast_lock(READER)
 * ill_mcast_type               ill_mcast_lock(WRITER)  ill_mcast_lock(READER)
 * ill_mcast_v1_time            ill_mcast_lock(WRITER)  ill_mcast_lock(READER)
 * ill_mcast_v2_time            ill_mcast_lock(WRITER)  ill_mcast_lock(READER)
 * ill_mcast_v1_tset            ill_mcast_lock(WRITER)  ill_mcast_lock(READER)
 * ill_mcast_v2_tset            ill_mcast_lock(WRITER)  ill_mcast_lock(READER)
 * ill_mcast_rv                 ill_mcast_lock(WRITER)  ill_mcast_lock(READER)
 * ill_mcast_qi                 ill_mcast_lock(WRITER)  ill_mcast_lock(READER)
 *
 * ill_down_mp                  ipsq                    ipsq
 * ill_dlpi_deferred            ill_lock                ill_lock
 * ill_dlpi_pending             ipsq + ill_lock         ipsq or ill_lock or
 *                                                      absence of ipsq writer.
 * ill_phys_addr_mp             ipsq + down ill         only when ill is up
 * ill_mcast_deferred           ill_lock                ill_lock
 * ill_phys_addr                ipsq + down ill         only when ill is up
 * ill_dest_addr_mp             ipsq + down ill         only when ill is up
 * ill_dest_addr                ipsq + down ill         only when ill is up
 *
 * ill_state_flags              ill_lock                ill_lock
 * exclusive bit flags          ipsq_t                  ipsq_t
 * shared bit flags             ill_lock                ill_lock
 *
 * ill_muxid                    ipsq                    Not atomic
 *
 * ill_ipf_gen                  Not atomic
 * ill_frag_count               atomics                 atomics
 * ill_type                     ipsq + down ill         only when ill is up
 * ill_dlpi_multicast_state     ill_lock                ill_lock
 * ill_dlpi_fastpath_state      ill_lock                ill_lock
 * ill_dlpi_capab_state         ipsq                    ipsq
 * ill_max_hops                 ipsq                    Not atomic
 *
 * ill_mtu                      ill_lock                None
 * ill_mc_mtu                   ill_lock                None
 *
 * ill_user_mtu                 ipsq + ill_lock         ill_lock
 * ill_reachable_time           ipsq + ill_lock         ill_lock
 * ill_reachable_retrans_time   ipsq + ill_lock         ill_lock
 * ill_max_buf                  ipsq + ill_lock         ill_lock
 *
 * Next 2 fields need ill_lock because of the get ioctls. They should not
 * report partially updated results without executing in the ipsq.
 * ill_token                    ipsq + ill_lock         ill_lock
 * ill_token_length             ipsq + ill_lock         ill_lock
 * ill_dest_token               ipsq + down ill         only when ill is up
 * ill_xmit_count               ipsq + down ill         write once
 * ill_ip6_mib                  ipsq + down ill         only when ill is up
 * ill_icmp6_mib                ipsq + down ill         only when ill is up
 *
 * ill_phyint                   ipsq, ill_g_lock, ill_lock      Any of them
 * ill_flags                    ill_lock                ill_lock
 * ill_nd_lla_mp                ipsq + down ill         only when ill is up
 * ill_nd_lla                   ipsq + down ill         only when ill is up
 * ill_nd_lla_len               ipsq + down ill         only when ill is up
 * ill_phys_addr_pend           ipsq + down ill         only when ill is up
 * ill_ifname_pending_err       ipsq                    ipsq
 * ill_avl_byppa                ipsq, ill_g_lock        write once
 *
 * ill_fastpath_list            ill_lock                ill_lock
 * ill_refcnt                   ill_lock                ill_lock
 * ill_ire_cnt                  ill_lock                ill_lock
 * ill_cv                       ill_lock                ill_lock
 * ill_mcast_nces               ill_lock                ill_lock
 * ill_ncec_cnt                 ill_lock                ill_lock
 * ill_nce_cnt                  ill_lock                ill_lock
 * ill_ilm_cnt                  ill_lock                ill_lock
 * ill_src_ipif                 ill_g_lock              ill_g_lock
 * ill_trace                    ill_lock                ill_lock
 * ill_usesrc_grp_next          ill_g_usesrc_lock       ill_g_usesrc_lock
 * ill_dhcpinit                 atomics                 atomics
 * ill_flownotify_mh            write once              write once
 * ill_capab_pending_cnt        ipsq                    ipsq
 * ill_ipallmulti_cnt           ill_lock                ill_lock
 * ill_ipallmulti_ilm           ill_lock                ill_lock
 * ill_saved_ire_mp             ill_saved_ire_lock      ill_saved_ire_lock
 * ill_saved_ire_cnt            ill_saved_ire_lock      ill_saved_ire_lock
 * ill_arl                      ???                     ???
 * ill_ire_multicast            ipsq + quiescent        none
 * ill_bound_ipif               ipsq                    ipsq
 * ill_actnode                  ipsq + ipmp_lock        ipsq OR ipmp_lock
 * ill_grpnode                  ipsq + ill_g_lock       ipsq OR ill_g_lock
 * ill_src_ipif                 ill_g_lock              ill_g_lock
 * ill_move_ipif                ipsq                    ipsq
 * ill_nom_cast                 ipsq                    ipsq OR advisory
 * ill_refresh_tid              ill_lock                ill_lock
 * ill_grp (for IPMP ill)       write once              write once
 * ill_grp (for underlying ill) ipsq + ill_g_lock       ipsq OR ill_g_lock
 * ill_grp_pending              ill_mcast_serializer    ill_mcast_serializer
 * ill_mrouter_cnt              atomics                 atomics
 * ill_mphysaddr_list   ill_lock                ill_lock
 *
 * NOTE: It's OK to make heuristic decisions on an underlying interface
 *       by using IS_UNDER_IPMP() or comparing ill_grp's raw pointer value.
 */

/*
 * For ioctl restart mechanism see ip_reprocess_ioctl()
 */
struct ip_ioctl_cmd_s;

typedef int (*ifunc_t)(ipif_t *, struct sockaddr_in *, queue_t *, mblk_t *,
    struct ip_ioctl_cmd_s *, void *);

typedef struct ip_ioctl_cmd_s {
        int     ipi_cmd;
        size_t  ipi_copyin_size;
        uint_t  ipi_flags;
        uint_t  ipi_cmd_type;
        ifunc_t ipi_func;
        ifunc_t ipi_func_restart;
} ip_ioctl_cmd_t;

/*
 * ipi_cmd_type:
 *
 * IF_CMD               1       old style ifreq cmd
 * LIF_CMD              2       new style lifreq cmd
 * ARP_CMD              3       arpreq cmd
 * XARP_CMD             4       xarpreq cmd
 * MSFILT_CMD           5       multicast source filter cmd
 * MISC_CMD             6       misc cmd (not a more specific one above)
 */

enum { IF_CMD = 1, LIF_CMD, ARP_CMD, XARP_CMD, MSFILT_CMD, MISC_CMD };

#define IPI_DONTCARE    0       /* For ioctl encoded values that don't matter */

/* Flag values in ipi_flags */
#define IPI_PRIV        0x1     /* Command requires PRIV_SYS_IP_CONFIG */
#define IPI_MODOK       0x2     /* Permitted on mod instance of IP */
#define IPI_WR          0x4     /* Need to grab writer access */
#define IPI_GET_CMD     0x8     /* branch to mi_copyout on success */
/*      unused          0x10    */
#define IPI_NULL_BCONT  0x20    /* ioctl has not data and hence no b_cont */

extern ip_ioctl_cmd_t   ip_ndx_ioctl_table[];
extern ip_ioctl_cmd_t   ip_misc_ioctl_table[];
extern int ip_ndx_ioctl_count;
extern int ip_misc_ioctl_count;

/* Passed down by ARP to IP during I_PLINK/I_PUNLINK */
typedef struct ipmx_s {
        char    ipmx_name[LIFNAMSIZ];           /* if name */
        uint_t
                ipmx_arpdev_stream : 1,         /* This is the arp stream */
                ipmx_notused : 31;
} ipmx_t;

/*
 * State for detecting if a driver supports certain features.
 * Support for DL_ENABMULTI_REQ uses ill_dlpi_multicast_state.
 * Support for DLPI M_DATA fastpath uses ill_dlpi_fastpath_state.
 */
#define IDS_UNKNOWN     0       /* No DLPI request sent */
#define IDS_INPROGRESS  1       /* DLPI request sent */
#define IDS_OK          2       /* DLPI request completed successfully */
#define IDS_FAILED      3       /* DLPI request failed */

/* Support for DL_CAPABILITY_REQ uses ill_dlpi_capab_state. */
enum {
        IDCS_UNKNOWN,
        IDCS_PROBE_SENT,
        IDCS_OK,
        IDCS_RESET_SENT,
        IDCS_RENEG,
        IDCS_FAILED
};

/* Extended NDP Management Structure */
typedef struct ipndp_s {
        ndgetf_t        ip_ndp_getf;
        ndsetf_t        ip_ndp_setf;
        caddr_t         ip_ndp_data;
        char            *ip_ndp_name;
} ipndp_t;

/* IXA Notification types */
typedef enum {
        IXAN_LSO,       /* LSO capability change */
        IXAN_PMTU,      /* PMTU change */
        IXAN_ZCOPY      /* ZEROCOPY capability change */
} ixa_notify_type_t;

typedef uint_t ixa_notify_arg_t;

typedef void    (*ixa_notify_t)(void *, ip_xmit_attr_t *ixa, ixa_notify_type_t,
    ixa_notify_arg_t);

/*
 * Attribute flags that are common to the transmit and receive attributes
 */
#define IAF_IS_IPV4             0x80000000      /* ipsec_*_v4 */
#define IAF_TRUSTED_ICMP        0x40000000      /* ipsec_*_icmp_loopback */
#define IAF_NO_LOOP_ZONEID_SET  0x20000000      /* Zone that shouldn't have */
                                                /* a copy */
#define IAF_LOOPBACK_COPY       0x10000000      /* For multi and broadcast */

#define IAF_MASK                0xf0000000      /* Flags that are common */

/*
 * Transmit side attributes used between the transport protocols and IP as
 * well as inside IP. It is also used to cache information in the conn_t i.e.
 * replaces conn_ire and the IPsec caching in the conn_t.
 */
struct ip_xmit_attr_s {
        iaflags_t       ixa_flags;      /* IXAF_*. See below */

        uint32_t        ixa_free_flags; /* IXA_FREE_*. See below */
        uint32_t        ixa_refcnt;     /* Using atomics */

        /*
         * Always initialized independently of ixa_flags settings.
         * Used by ip_xmit so we keep them up front for cache locality.
         */
        uint32_t        ixa_xmit_hint;  /* For ECMP and GLD TX ring fanout */
        uint_t          ixa_pktlen;     /* Always set. For frag and stats */
        zoneid_t        ixa_zoneid;     /* Assumed always set */

        /* Always set for conn_ip_output(); might be stale */
        /*
         * Since TCP keeps the conn_t around past the process going away
         * we need to use the "notr" (e.g, ire_refhold_notr) for ixa_ire,
         * ixa_nce, and ixa_dce.
         */
        ire_t           *ixa_ire;       /* Forwarding table entry */
        uint_t          ixa_ire_generation;
        nce_t           *ixa_nce;       /* Neighbor cache entry */
        dce_t           *ixa_dce;       /* Destination cache entry */
        uint_t          ixa_dce_generation;
        uint_t          ixa_src_generation;     /* If IXAF_VERIFY_SOURCE */

        uint32_t        ixa_src_preferences;    /* prefs for src addr select */
        uint32_t        ixa_pmtu;               /* IXAF_VERIFY_PMTU */

        /* Set by ULP if IXAF_VERIFY_PMTU; otherwise set by IP */
        uint32_t        ixa_fragsize;

        int8_t          ixa_use_min_mtu;        /* IXAF_USE_MIN_MTU values */

        pfirepostfrag_t ixa_postfragfn;         /* Set internally in IP */

        in6_addr_t      ixa_nexthop_v6;         /* IXAF_NEXTHOP_SET */
#define ixa_nexthop_v4  V4_PART_OF_V6(ixa_nexthop_v6)

        zoneid_t        ixa_no_loop_zoneid;     /* IXAF_NO_LOOP_ZONEID_SET */

        uint_t          ixa_scopeid;            /* For IPv6 link-locals */

        uint_t          ixa_broadcast_ttl;      /* IXAF_BROACAST_TTL_SET */

        uint_t          ixa_multicast_ttl;      /* Assumed set for multicast */
        uint_t          ixa_multicast_ifindex;  /* Assumed set for multicast */
        ipaddr_t        ixa_multicast_ifaddr;   /* Assumed set for multicast */

        int             ixa_raw_cksum_offset;   /* If IXAF_SET_RAW_CKSUM */

        uint32_t        ixa_ident;              /* For IPv6 fragment header */

        uint64_t        ixa_conn_id;            /* Used by DTrace */
        /*
         * Cached LSO information.
         */
        ill_lso_capab_t ixa_lso_capab;          /* Valid when IXAF_LSO_CAPAB */

        uint64_t        ixa_ipsec_policy_gen;   /* Generation from iph_gen */
        /*
         * The following IPsec fields are only initialized when
         * IXAF_IPSEC_SECURE is set. Otherwise they contain garbage.
         */
        ipsec_latch_t   *ixa_ipsec_latch;       /* Just the ids */
        struct ipsa_s   *ixa_ipsec_ah_sa;       /* Hard reference SA for AH */
        struct ipsa_s   *ixa_ipsec_esp_sa;      /* Hard reference SA for ESP */
        struct ipsec_policy_s   *ixa_ipsec_policy; /* why are we here? */
        struct ipsec_action_s   *ixa_ipsec_action; /* For reflected packets */
        ipsa_ref_t      ixa_ipsec_ref[2];       /* Soft reference to SA */
                                                /* 0: ESP, 1: AH */

        /*
         * The selectors here are potentially different than the SPD rule's
         * selectors, and we need to have both available for IKEv2.
         *
         * NOTE: "Source" and "Dest" are w.r.t. outbound datagrams.  Ports can
         *       be zero, and the protocol number is needed to make the ports
         *       significant.
         */
        uint16_t ixa_ipsec_src_port;    /* Source port number of d-gram. */
        uint16_t ixa_ipsec_dst_port;    /* Destination port number of d-gram. */
        uint8_t  ixa_ipsec_icmp_type;   /* ICMP type of d-gram */
        uint8_t  ixa_ipsec_icmp_code;   /* ICMP code of d-gram */

        sa_family_t ixa_ipsec_inaf;     /* Inner address family */
#define IXA_MAX_ADDRLEN 4       /* Max addr len. (in 32-bit words) */
        uint32_t ixa_ipsec_insrc[IXA_MAX_ADDRLEN];      /* Inner src address */
        uint32_t ixa_ipsec_indst[IXA_MAX_ADDRLEN];      /* Inner dest address */
        uint8_t  ixa_ipsec_insrcpfx;    /* Inner source prefix */
        uint8_t  ixa_ipsec_indstpfx;    /* Inner destination prefix */

        uint8_t ixa_ipsec_proto;        /* IP protocol number for d-gram. */

        /* Always initialized independently of ixa_flags settings */
        uint_t          ixa_ifindex;    /* Assumed always set */
        uint16_t        ixa_ip_hdr_length; /* Points to ULP header */
        uint8_t         ixa_protocol;   /* Protocol number for ULP cksum */
        ts_label_t      *ixa_tsl;       /* Always set. NULL if not TX */
        ip_stack_t      *ixa_ipst;      /* Always set */
        uint32_t        ixa_extra_ident; /* Set if LSO */
        cred_t          *ixa_cred;      /* For getpeerucred */
        pid_t           ixa_cpid;       /* For getpeerucred */

#ifdef DEBUG
        kthread_t       *ixa_curthread; /* For serialization assert */
#endif
        squeue_t        *ixa_sqp;       /* Set from conn_sqp as a hint */
        uintptr_t       ixa_cookie;     /* cookie to use for tx flow control */

        /*
         * Must be set by ULP if any of IXAF_VERIFY_LSO, IXAF_VERIFY_PMTU,
         * or IXAF_VERIFY_ZCOPY is set.
         */
        ixa_notify_t    ixa_notify;     /* Registered upcall notify function */
        void            *ixa_notify_cookie; /* ULP cookie for ixa_notify */

        uint_t          ixa_tcpcleanup; /* Used by conn_ixa_cleanup */
};

/*
 * Flags to indicate which transmit attributes are set.
 * Split into "xxx_SET" ones which indicate that the "xxx" field it set, and
 * single flags.
 */
#define IXAF_REACH_CONF         0x00000001      /* Reachability confirmation */
#define IXAF_BROADCAST_TTL_SET  0x00000002      /* ixa_broadcast_ttl valid */
#define IXAF_SET_SOURCE         0x00000004      /* Replace if broadcast */
#define IXAF_USE_MIN_MTU        0x00000008      /* IPV6_USE_MIN_MTU */

#define IXAF_DONTFRAG           0x00000010      /* IP*_DONTFRAG */
#define IXAF_VERIFY_PMTU        0x00000020      /* ixa_pmtu/ixa_fragsize set */
#define IXAF_PMTU_DISCOVERY     0x00000040      /* Create/use PMTU state */
#define IXAF_MULTICAST_LOOP     0x00000080      /* IP_MULTICAST_LOOP */

#define IXAF_IPSEC_SECURE       0x00000100      /* Need IPsec processing */
#define IXAF_UCRED_TSL          0x00000200      /* ixa_tsl from SCM_UCRED */
#define IXAF_DONTROUTE          0x00000400      /* SO_DONTROUTE */
#define IXAF_NO_IPSEC           0x00000800      /* Ignore policy */

#define IXAF_PMTU_TOO_SMALL     0x00001000      /* PMTU too small */
#define IXAF_SET_ULP_CKSUM      0x00002000      /* Calculate ULP checksum */
#define IXAF_VERIFY_SOURCE      0x00004000      /* Check that source is ok */
#define IXAF_NEXTHOP_SET        0x00008000      /* ixa_nexthop set */

#define IXAF_PMTU_IPV4_DF       0x00010000      /* Set IPv4 DF */
#define IXAF_NO_DEV_FLOW_CTL    0x00020000      /* Protocol needs no flow ctl */
#define IXAF_NO_TTL_CHANGE      0x00040000      /* Internal to IP */
#define IXAF_IPV6_ADD_FRAGHDR   0x00080000      /* Add fragment header */

#define IXAF_IPSEC_TUNNEL       0x00100000      /* Tunnel mode */
#define IXAF_NO_PFHOOK          0x00200000      /* Skip xmit pfhook */
#define IXAF_NO_TRACE           0x00400000      /* When back from ARP/ND */
#define IXAF_SCOPEID_SET        0x00800000      /* ixa_scopeid set */

#define IXAF_MULTIRT_MULTICAST  0x01000000      /* MULTIRT for multicast */
#define IXAF_NO_HW_CKSUM        0x02000000      /* Force software cksum */
#define IXAF_SET_RAW_CKSUM      0x04000000      /* Use ixa_raw_cksum_offset */
#define IXAF_IPSEC_GLOBAL_POLICY 0x08000000     /* Policy came from global */

/* Note the following uses bits 0x10000000 through 0x80000000 */
#define IXAF_IS_IPV4            IAF_IS_IPV4
#define IXAF_TRUSTED_ICMP       IAF_TRUSTED_ICMP
#define IXAF_NO_LOOP_ZONEID_SET IAF_NO_LOOP_ZONEID_SET
#define IXAF_LOOPBACK_COPY      IAF_LOOPBACK_COPY

/* Note: use the upper 32 bits */
#define IXAF_VERIFY_LSO         0x100000000     /* Check LSO capability */
#define IXAF_LSO_CAPAB          0x200000000     /* Capable of LSO */
#define IXAF_VERIFY_ZCOPY       0x400000000     /* Check Zero Copy capability */
#define IXAF_ZCOPY_CAPAB        0x800000000     /* Capable of ZEROCOPY */

/*
 * The normal flags for sending packets e.g., icmp errors
 */
#define IXAF_BASIC_SIMPLE_V4    \
        (IXAF_SET_ULP_CKSUM | IXAF_IS_IPV4 | IXAF_VERIFY_SOURCE)
#define IXAF_BASIC_SIMPLE_V6    (IXAF_SET_ULP_CKSUM | IXAF_VERIFY_SOURCE)

/*
 * Normally these fields do not have a hold. But in some cases they do, for
 * instance when we've gone through ip_*_attr_to/from_mblk.
 * We use ixa_free_flags to indicate that they have a hold and need to be
 * released on cleanup.
 */
#define IXA_FREE_CRED           0x00000001      /* ixa_cred needs to be rele */
#define IXA_FREE_TSL            0x00000002      /* ixa_tsl needs to be rele */

/*
 * Trivial state machine used to synchronize IXA cleanup for TCP connections.
 * See conn_ixa_cleanup().
 */
#define IXATC_IDLE              0x00000000
#define IXATC_INPROGRESS        0x00000001
#define IXATC_COMPLETE          0x00000002

/*
 * Simplistic way to set the ixa_xmit_hint for locally generated traffic
 * and forwarded traffic. The shift amount are based on the size of the
 * structs to discard the low order bits which don't have much if any variation
 * (coloring in kmem_cache_alloc might provide some variation).
 *
 * Basing the locally generated hint on the address of the conn_t means that
 * the packets from the same socket/connection do not get reordered.
 * Basing the hint for forwarded traffic on the ill_ring_t means that
 * packets from the same NIC+ring are likely to use the same outbound ring
 * hence we get low contention on the ring in the transmitting driver.
 */
#define CONN_TO_XMIT_HINT(connp)        ((uint32_t)(((uintptr_t)connp) >> 11))
#define ILL_RING_TO_XMIT_HINT(ring)     ((uint32_t)(((uintptr_t)ring) >> 7))

/*
 * IP set Destination Flags used by function ip_set_destination,
 * ip_attr_connect, and conn_connect.
 */
#define IPDF_ALLOW_MCBC         0x1     /* Allow multi/broadcast */
#define IPDF_VERIFY_DST         0x2     /* Verify destination addr */
#define IPDF_SELECT_SRC         0x4     /* Select source address */
#define IPDF_LSO                0x8     /* Try LSO */
#define IPDF_IPSEC              0x10    /* Set IPsec policy */
#define IPDF_ZONE_IS_GLOBAL     0x20    /* From conn_zone_is_global */
#define IPDF_ZCOPY              0x40    /* Try ZEROCOPY */
#define IPDF_UNIQUE_DCE         0x80    /* Get a per-destination DCE */

/*
 * Receive side attributes used between the transport protocols and IP as
 * well as inside IP.
 */
struct ip_recv_attr_s {
        iaflags_t       ira_flags;      /* See below */

        uint32_t        ira_free_flags; /* IRA_FREE_*. See below */

        /*
         * This is a hint for TCP SYN packets.
         * Always initialized independently of ira_flags settings
         */
        squeue_t        *ira_sqp;
        ill_rx_ring_t   *ira_ring;      /* Internal to IP */

        /* For ip_accept_tcp when IRAF_TARGET_SQP is set */
        squeue_t        *ira_target_sqp;
        mblk_t          *ira_target_sqp_mp;

        /* Always initialized independently of ira_flags settings */
        uint32_t        ira_xmit_hint;  /* For ECMP and GLD TX ring fanout */
        zoneid_t        ira_zoneid;     /* ALL_ZONES unless local delivery */
        uint_t          ira_pktlen;     /* Always set. For frag and stats */
        uint16_t        ira_ip_hdr_length; /* Points to ULP header */
        uint8_t         ira_protocol;   /* Protocol number for ULP cksum */
        uint8_t         ira_ttl;        /* IP TTL / IPv6 Hop Count */
        uint_t          ira_rifindex;   /* Received ifindex */
        uint_t          ira_ruifindex;  /* Received upper ifindex */
        ts_label_t      *ira_tsl;       /* Always set. NULL if not TX */
        /*
         * ira_rill and ira_ill is set inside IP, but not when conn_recv is
         * called; ULPs should use ira_ruifindex instead.
         */
        ill_t           *ira_rill;      /* ill where packet came */
        ill_t           *ira_ill;       /* ill where IP address hosted */
        cred_t          *ira_cred;      /* For getpeerucred */
        pid_t           ira_cpid;       /* For getpeerucred */

        /* Used when IRAF_VERIFIED_SRC is set; this source was ok */
        ipaddr_t        ira_verified_src;

        /*
         * The following IPsec fields are only initialized when
         * IRAF_IPSEC_SECURE is set. Otherwise they contain garbage.
         */
        struct ipsec_action_s *ira_ipsec_action; /* how we made it in.. */
        struct ipsa_s   *ira_ipsec_ah_sa;       /* SA for AH */
        struct ipsa_s   *ira_ipsec_esp_sa;      /* SA for ESP */

        ipaddr_t        ira_mroute_tunnel;      /* IRAF_MROUTE_TUNNEL_SET */

        zoneid_t        ira_no_loop_zoneid;     /* IRAF_NO_LOOP_ZONEID_SET */

        uint32_t        ira_esp_udp_ports;      /* IRAF_ESP_UDP_PORTS */

        /*
         * For IP_RECVSLLA and ip_ndp_conflict/find_solicitation.
         * Same size as max for sockaddr_dl
         */
#define IRA_L2SRC_SIZE  244
        uint8_t         ira_l2src[IRA_L2SRC_SIZE];      /* If IRAF_L2SRC_SET */

        /*
         * Local handle that we use to do lazy setting of ira_l2src.
         * We defer setting l2src until needed but we do before any
         * ip_input pullupmsg or copymsg.
         */
        struct mac_header_info_s *ira_mhip;     /* Could be NULL */
};

/*
 * Flags to indicate which receive attributes are set.
 */
#define IRAF_SYSTEM_LABELED     0x00000001      /* is_system_labeled() */
#define IRAF_IPV4_OPTIONS       0x00000002      /* Performance */
#define IRAF_MULTICAST          0x00000004      /* Was multicast at L3 */
#define IRAF_BROADCAST          0x00000008      /* Was broadcast at L3 */
#define IRAF_MULTIBROADCAST     (IRAF_MULTICAST|IRAF_BROADCAST)

#define IRAF_LOOPBACK           0x00000010      /* Looped back by IP */
#define IRAF_VERIFY_IP_CKSUM    0x00000020      /* Need to verify IP */
#define IRAF_VERIFY_ULP_CKSUM   0x00000040      /* Need to verify TCP,UDP,etc */
#define IRAF_SCTP_CSUM_ERR      0x00000080      /* sctp pkt has failed chksum */

#define IRAF_IPSEC_SECURE       0x00000100      /* Passed AH and/or ESP */
#define IRAF_DHCP_UNICAST       0x00000200
#define IRAF_IPSEC_DECAPS       0x00000400      /* Was packet decapsulated */
                                        /* from a matching inner packet? */
#define IRAF_TARGET_SQP         0x00000800      /* ira_target_sqp is set */
#define IRAF_VERIFIED_SRC       0x00001000      /* ira_verified_src set */
#define IRAF_RSVP               0x00002000      /* RSVP packet for rsvpd */
#define IRAF_MROUTE_TUNNEL_SET  0x00004000      /* From ip_mroute_decap */
#define IRAF_PIM_REGISTER       0x00008000      /* From register_mforward */

#define IRAF_TX_MAC_EXEMPTABLE  0x00010000      /* Allow MAC_EXEMPT readdown */
#define IRAF_TX_SHARED_ADDR     0x00020000      /* Arrived on ALL_ZONES addr */
#define IRAF_ESP_UDP_PORTS      0x00040000      /* NAT-traversal packet */
#define IRAF_NO_HW_CKSUM        0x00080000      /* Force software cksum */

#define IRAF_ICMP_ERROR         0x00100000      /* Send to conn_recvicmp */
#define IRAF_ROUTER_ALERT       0x00200000      /* IPv6 router alert */
#define IRAF_L2SRC_SET          0x00400000      /* ira_l2src has been set */
#define IRAF_L2SRC_LOOPBACK     0x00800000      /* Came from us */

#define IRAF_L2DST_MULTICAST    0x01000000      /* Multicast at L2 */
#define IRAF_L2DST_BROADCAST    0x02000000      /* Broadcast at L2 */
/* Unused 0x04000000 */
/* Unused 0x08000000 */

/* Below starts with 0x10000000 */
#define IRAF_IS_IPV4            IAF_IS_IPV4
#define IRAF_TRUSTED_ICMP       IAF_TRUSTED_ICMP
#define IRAF_NO_LOOP_ZONEID_SET IAF_NO_LOOP_ZONEID_SET
#define IRAF_LOOPBACK_COPY      IAF_LOOPBACK_COPY

/*
 * Normally these fields do not have a hold. But in some cases they do, for
 * instance when we've gone through ip_*_attr_to/from_mblk.
 * We use ira_free_flags to indicate that they have a hold and need to be
 * released on cleanup.
 */
#define IRA_FREE_CRED           0x00000001      /* ira_cred needs to be rele */
#define IRA_FREE_TSL            0x00000002      /* ira_tsl needs to be rele */

/*
 * Optional destination cache entry for path MTU information,
 * and ULP metrics.
 */
struct dce_s {
        uint_t          dce_generation; /* Changed since cached? */
        uint_t          dce_flags;      /* See below */
        uint_t          dce_ipversion;  /* IPv4/IPv6 version */
        uint32_t        dce_pmtu;       /* Path MTU if DCEF_PMTU */
        uint32_t        dce_ident;      /* Per destination IP ident. */
        iulp_t          dce_uinfo;      /* Metrics if DCEF_UINFO */

        struct dce_s    *dce_next;
        struct dce_s    **dce_ptpn;
        struct dcb_s    *dce_bucket;

        union {
                in6_addr_t      dceu_v6addr;
                ipaddr_t        dceu_v4addr;
        } dce_u;
#define dce_v4addr      dce_u.dceu_v4addr
#define dce_v6addr      dce_u.dceu_v6addr
        /* Note that for IPv6+IPMP we use the ifindex for the upper interface */
        uint_t          dce_ifindex;    /* For IPv6 link-locals */

        kmutex_t        dce_lock;
        uint_t          dce_refcnt;
        uint64_t        dce_last_change_time;   /* Path MTU. In seconds */

        ip_stack_t      *dce_ipst;      /* Does not have a netstack_hold */
};

/*
 * Values for dce_generation.
 *
 * If a DCE has DCE_GENERATION_CONDEMNED, the last dce_refrele should delete
 * it.
 *
 * DCE_GENERATION_VERIFY is never stored in dce_generation but it is
 * stored in places that cache DCE (such as ixa_dce_generation).
 * It is used as a signal that the cache is stale and needs to be reverified.
 */
#define DCE_GENERATION_CONDEMNED        0
#define DCE_GENERATION_VERIFY           1
#define DCE_GENERATION_INITIAL          2
#define DCE_IS_CONDEMNED(dce) \
        ((dce)->dce_generation == DCE_GENERATION_CONDEMNED)


/*
 * Values for ips_src_generation.
 *
 * SRC_GENERATION_VERIFY is never stored in ips_src_generation but it is
 * stored in places that cache IREs (ixa_src_generation). It is used as a
 * signal that the cache is stale and needs to be reverified.
 */
#define SRC_GENERATION_VERIFY           0
#define SRC_GENERATION_INITIAL          1

/*
 * The kernel stores security attributes of all gateways in a database made
 * up of one or more tsol_gcdb_t elements.  Each tsol_gcdb_t contains the
 * security-related credentials of the gateway.  More than one gateways may
 * share entries in the database.
 *
 * The tsol_gc_t structure represents the gateway to credential association,
 * and refers to an entry in the database.  One or more tsol_gc_t entities are
 * grouped together to form one or more tsol_gcgrp_t, each representing the
 * list of security attributes specific to the gateway.  A gateway may be
 * associated with at most one credentials group.
 */
struct tsol_gcgrp_s;

extern uchar_t  ip6opt_ls;      /* TX IPv6 enabler */

/*
 * Gateway security credential record.
 */
typedef struct tsol_gcdb_s {
        uint_t          gcdb_refcnt;    /* reference count */
        struct rtsa_s   gcdb_attr;      /* security attributes */
#define gcdb_mask       gcdb_attr.rtsa_mask
#define gcdb_doi        gcdb_attr.rtsa_doi
#define gcdb_slrange    gcdb_attr.rtsa_slrange
} tsol_gcdb_t;

/*
 * Gateway to credential association.
 */
typedef struct tsol_gc_s {
        uint_t          gc_refcnt;      /* reference count */
        struct tsol_gcgrp_s *gc_grp;    /* pointer to group */
        struct tsol_gc_s *gc_prev;      /* previous in list */
        struct tsol_gc_s *gc_next;      /* next in list */
        tsol_gcdb_t     *gc_db;         /* pointer to actual credentials */
} tsol_gc_t;

/*
 * Gateway credentials group address.
 */
typedef struct tsol_gcgrp_addr_s {
        int             ga_af;          /* address family */
        in6_addr_t      ga_addr;        /* IPv4 mapped or IPv6 address */
} tsol_gcgrp_addr_t;

/*
 * Gateway credentials group.
 */
typedef struct tsol_gcgrp_s {
        uint_t          gcgrp_refcnt;   /* reference count */
        krwlock_t       gcgrp_rwlock;   /* lock to protect following */
        uint_t          gcgrp_count;    /* number of credentials */
        tsol_gc_t       *gcgrp_head;    /* first credential in list */
        tsol_gc_t       *gcgrp_tail;    /* last credential in list */
        tsol_gcgrp_addr_t gcgrp_addr;   /* next-hop gateway address */
} tsol_gcgrp_t;

extern kmutex_t gcgrp_lock;

#define GC_REFRELE(p) {                         \
        ASSERT((p)->gc_grp != NULL);            \
        rw_enter(&(p)->gc_grp->gcgrp_rwlock, RW_WRITER); \
        ASSERT((p)->gc_refcnt > 0);             \
        if (--((p)->gc_refcnt) == 0)            \
                gc_inactive(p);                 \
        else                                    \
                rw_exit(&(p)->gc_grp->gcgrp_rwlock); \
}

#define GCGRP_REFHOLD(p) {                      \
        mutex_enter(&gcgrp_lock);               \
        ++((p)->gcgrp_refcnt);                  \
        ASSERT((p)->gcgrp_refcnt != 0);         \
        mutex_exit(&gcgrp_lock);                \
}

#define GCGRP_REFRELE(p) {                      \
        mutex_enter(&gcgrp_lock);               \
        ASSERT((p)->gcgrp_refcnt > 0);          \
        if (--((p)->gcgrp_refcnt) == 0)         \
                gcgrp_inactive(p);              \
        ASSERT(MUTEX_HELD(&gcgrp_lock));        \
        mutex_exit(&gcgrp_lock);                \
}

/*
 * IRE gateway security attributes structure, pointed to by tsol_ire_gw_secattr
 */
struct tsol_tnrhc;

struct tsol_ire_gw_secattr_s {
        kmutex_t        igsa_lock;      /* lock to protect following */
        struct tsol_tnrhc *igsa_rhc;    /* host entry for gateway */
        tsol_gc_t       *igsa_gc;       /* for prefix IREs */
};

void irb_refrele_ftable(irb_t *);

extern struct kmem_cache *rt_entry_cache;

typedef struct ire4 {
        ipaddr_t ire4_mask;             /* Mask for matching this IRE. */
        ipaddr_t ire4_addr;             /* Address this IRE represents. */
        ipaddr_t ire4_gateway_addr;     /* Gateway including for IRE_ONLINK */
        ipaddr_t ire4_setsrc_addr;      /* RTF_SETSRC */
} ire4_t;

typedef struct ire6 {
        in6_addr_t ire6_mask;           /* Mask for matching this IRE. */
        in6_addr_t ire6_addr;           /* Address this IRE represents. */
        in6_addr_t ire6_gateway_addr;   /* Gateway including for IRE_ONLINK */
        in6_addr_t ire6_setsrc_addr;    /* RTF_SETSRC */
} ire6_t;

typedef union ire_addr {
        ire6_t  ire6_u;
        ire4_t  ire4_u;
} ire_addr_u_t;

/*
 * Internet Routing Entry
 * When we have multiple identical IREs we logically add them by manipulating
 * ire_identical_ref and ire_delete first decrements
 * that and when it reaches 1 we know it is the last IRE.
 * "identical" is defined as being the same for:
 * ire_addr, ire_netmask, ire_gateway, ire_ill, ire_zoneid, and ire_type
 * For instance, multiple IRE_BROADCASTs for the same subnet number are
 * viewed as identical, and so are the IRE_INTERFACEs when there are
 * multiple logical interfaces (on the same ill) with the same subnet prefix.
 */
struct ire_s {
        struct  ire_s   *ire_next;      /* The hash chain must be first. */
        struct  ire_s   **ire_ptpn;     /* Pointer to previous next. */
        uint32_t        ire_refcnt;     /* Number of references */
        ill_t           *ire_ill;
        uint32_t        ire_identical_ref; /* IRE_INTERFACE, IRE_BROADCAST */
        uchar_t         ire_ipversion;  /* IPv4/IPv6 version */
        ushort_t        ire_type;       /* Type of IRE */
        uint_t          ire_generation; /* Generation including CONDEMNED */
        uint_t  ire_ib_pkt_count;       /* Inbound packets for ire_addr */
        uint_t  ire_ob_pkt_count;       /* Outbound packets to ire_addr */
        time_t  ire_create_time;        /* Time (in secs) IRE was created. */
        uint32_t        ire_flags;      /* flags related to route (RTF_*) */
        /*
         * ire_testhidden is TRUE for INTERFACE IREs of IS_UNDER_IPMP(ill)
         * interfaces
         */
        boolean_t       ire_testhidden;
        pfirerecv_t     ire_recvfn;     /* Receive side handling */
        pfiresend_t     ire_sendfn;     /* Send side handling */
        pfirepostfrag_t ire_postfragfn; /* Bottom end of send handling */

        uint_t          ire_masklen;    /* # bits in ire_mask{,_v6} */
        ire_addr_u_t    ire_u;          /* IPv4/IPv6 address info. */

        irb_t           *ire_bucket;    /* Hash bucket when ire_ptphn is set */
        kmutex_t        ire_lock;
        clock_t         ire_last_used_time;     /* For IRE_LOCAL reception */
        tsol_ire_gw_secattr_t *ire_gw_secattr; /* gateway security attributes */
        zoneid_t        ire_zoneid;

        /*
         * Cached information of where to send packets that match this route.
         * The ire_dep_* information is used to determine when ire_nce_cache
         * needs to be updated.
         * ire_nce_cache is the fastpath for the Neighbor Cache Entry
         * for IPv6; arp info for IPv4
         * Since this is a cache setup and torn down independently of
         * applications we need to use nce_ref{rele,hold}_notr for it.
         */
        nce_t           *ire_nce_cache;

        /*
         * Quick check whether the ire_type and ire_masklen indicates
         * that the IRE can have ire_nce_cache set i.e., whether it is
         * IRE_ONLINK and for a single destination.
         */
        boolean_t       ire_nce_capable;

        /*
         * Dependency tracking so we can safely cache IRE and NCE pointers
         * in offlink and onlink IREs.
         * These are locked under the ips_ire_dep_lock rwlock. Write held
         * when modifying the linkage.
         * ire_dep_parent (Also chain towards IRE for nexthop)
         * ire_dep_parent_generation: ire_generation of ire_dep_parent
         * ire_dep_children (From parent to first child)
         * ire_dep_sib_next (linked list of siblings)
         * ire_dep_sib_ptpn (linked list of siblings)
         *
         * The parent has a ire_refhold on each child, and each child has
         * an ire_refhold on its parent.
         * Since ire_dep_parent is a cache setup and torn down independently of
         * applications we need to use ire_ref{rele,hold}_notr for it.
         */
        ire_t           *ire_dep_parent;
        ire_t           *ire_dep_children;
        ire_t           *ire_dep_sib_next;
        ire_t           **ire_dep_sib_ptpn;     /* Pointer to previous next */
        uint_t          ire_dep_parent_generation;

        uint_t          ire_badcnt;     /* Number of times ND_UNREACHABLE */
        uint64_t        ire_last_badcnt;        /* In seconds */

        /* ire_defense* and ire_last_used_time are only used on IRE_LOCALs */
        uint_t          ire_defense_count;      /* number of ARP conflicts */
        uint_t          ire_defense_time;       /* last time defended (secs) */

        boolean_t       ire_trace_disable;      /* True when alloc fails */
        ip_stack_t      *ire_ipst;      /* Does not have a netstack_hold */
        iulp_t          ire_metrics;
        /*
         * default and prefix routes that are added without explicitly
         * specifying the interface are termed "unbound" routes, and will
         * have ire_unbound set to true.
         */
        boolean_t       ire_unbound;
};

/* IPv4 compatibility macros */
#define ire_mask                ire_u.ire4_u.ire4_mask
#define ire_addr                ire_u.ire4_u.ire4_addr
#define ire_gateway_addr        ire_u.ire4_u.ire4_gateway_addr
#define ire_setsrc_addr         ire_u.ire4_u.ire4_setsrc_addr

#define ire_mask_v6             ire_u.ire6_u.ire6_mask
#define ire_addr_v6             ire_u.ire6_u.ire6_addr
#define ire_gateway_addr_v6     ire_u.ire6_u.ire6_gateway_addr
#define ire_setsrc_addr_v6      ire_u.ire6_u.ire6_setsrc_addr

/*
 * Values for ire_generation.
 *
 * If an IRE is marked with IRE_IS_CONDEMNED, the last walker of
 * the bucket should delete this IRE from this bucket.
 *
 * IRE_GENERATION_VERIFY is never stored in ire_generation but it is
 * stored in places that cache IREs (such as ixa_ire_generation and
 * ire_dep_parent_generation). It is used as a signal that the cache is
 * stale and needs to be reverified.
 */
#define IRE_GENERATION_CONDEMNED        0
#define IRE_GENERATION_VERIFY           1
#define IRE_GENERATION_INITIAL          2
#define IRE_IS_CONDEMNED(ire) \
        ((ire)->ire_generation == IRE_GENERATION_CONDEMNED)

/* Convenient typedefs for sockaddrs */
typedef struct sockaddr_in      sin_t;
typedef struct sockaddr_in6     sin6_t;

/* Name/Value Descriptor. */
typedef struct nv_s {
        uint64_t nv_value;
        char    *nv_name;
} nv_t;

#define ILL_FRAG_HASH(s, i) \
        ((ntohl(s) ^ ((i) ^ ((i) >> 8))) % ILL_FRAG_HASH_TBL_COUNT)

/*
 * The MAX number of allowed fragmented packets per hash bucket
 * calculation is based on the most common mtu size of 1500. This limit
 * will work well for other mtu sizes as well.
 */
#define COMMON_IP_MTU 1500
#define MAX_FRAG_MIN 10
#define MAX_FRAG_PKTS(ipst)     \
        MAX(MAX_FRAG_MIN, (2 * (ipst->ips_ip_reass_queue_bytes / \
            (COMMON_IP_MTU * ILL_FRAG_HASH_TBL_COUNT))))

/*
 * Maximum dups allowed per packet.
 */
extern uint_t ip_max_frag_dups;

/*
 * Per-packet information for received packets and transmitted.
 * Used by the transport protocols when converting between the packet
 * and ancillary data and socket options.
 *
 * Note: This private data structure and related IPPF_* constant
 * definitions are exposed to enable compilation of some debugging tools
 * like lsof which use struct tcp_t in <inet/tcp.h>. This is intended to be
 * a temporary hack and long term alternate interfaces should be defined
 * to support the needs of such tools and private definitions moved to
 * private headers.
 */
struct ip_pkt_s {
        uint_t          ipp_fields;             /* Which fields are valid */
        in6_addr_t      ipp_addr;               /* pktinfo src/dst addr */
#define ipp_addr_v4     V4_PART_OF_V6(ipp_addr)
        uint_t          ipp_unicast_hops;       /* IPV6_UNICAST_HOPS, IP_TTL */
        uint_t          ipp_hoplimit;           /* IPV6_HOPLIMIT */
        uint_t          ipp_hopoptslen;
        uint_t          ipp_rthdrdstoptslen;
        uint_t          ipp_rthdrlen;
        uint_t          ipp_dstoptslen;
        uint_t          ipp_fraghdrlen;
        ip6_hbh_t       *ipp_hopopts;
        ip6_dest_t      *ipp_rthdrdstopts;
        ip6_rthdr_t     *ipp_rthdr;
        ip6_dest_t      *ipp_dstopts;
        ip6_frag_t      *ipp_fraghdr;
        uint8_t         ipp_tclass;             /* IPV6_TCLASS */
        uint8_t         ipp_type_of_service;    /* IP_TOS */
        uint_t          ipp_ipv4_options_len;   /* Len of IPv4 options */
        uint8_t         *ipp_ipv4_options;      /* Ptr to IPv4 options */
        uint_t          ipp_label_len_v4;       /* Len of TX label for IPv4 */
        uint8_t         *ipp_label_v4;          /* TX label for IPv4 */
        uint_t          ipp_label_len_v6;       /* Len of TX label for IPv6 */
        uint8_t         *ipp_label_v6;          /* TX label for IPv6 */
};
typedef struct ip_pkt_s ip_pkt_t;

extern void ip_pkt_free(ip_pkt_t *);    /* free storage inside ip_pkt_t */
extern ipaddr_t ip_pkt_source_route_v4(const ip_pkt_t *);
extern in6_addr_t *ip_pkt_source_route_v6(const ip_pkt_t *);
extern int ip_pkt_copy(ip_pkt_t *, ip_pkt_t *, int);
extern void ip_pkt_source_route_reverse_v4(ip_pkt_t *);

/* ipp_fields values */
#define IPPF_ADDR               0x0001  /* Part of in6_pktinfo: src/dst addr */
#define IPPF_HOPLIMIT           0x0002  /* Overrides unicast and multicast */
#define IPPF_TCLASS             0x0004  /* Overrides class in sin6_flowinfo */

#define IPPF_HOPOPTS            0x0010  /* ipp_hopopts set */
#define IPPF_RTHDR              0x0020  /* ipp_rthdr set */
#define IPPF_RTHDRDSTOPTS       0x0040  /* ipp_rthdrdstopts set */
#define IPPF_DSTOPTS            0x0080  /* ipp_dstopts set */

#define IPPF_IPV4_OPTIONS       0x0100  /* ipp_ipv4_options set */
#define IPPF_LABEL_V4           0x0200  /* ipp_label_v4 set */
#define IPPF_LABEL_V6           0x0400  /* ipp_label_v6 set */

#define IPPF_FRAGHDR            0x0800  /* Used for IPsec receive side */

/*
 * Data structure which is passed to conn_opt_get/set.
 * The conn_t is included even though it can be inferred from queue_t.
 * setsockopt and getsockopt use conn_ixa and conn_xmit_ipp. However,
 * when handling ancillary data we use separate ixa and ipps.
 */
typedef struct conn_opt_arg_s {
        conn_t          *coa_connp;
        ip_xmit_attr_t  *coa_ixa;
        ip_pkt_t        *coa_ipp;
        boolean_t       coa_ancillary;  /* Ancillary data and not setsockopt */
        uint_t          coa_changed;    /* See below */
} conn_opt_arg_t;

/*
 * Flags for what changed.
 * If we want to be more efficient in the future we can have more fine
 * grained flags e.g., a flag for just IP_TOS changing.
 * For now we either call ip_set_destination (for "route changed")
 * and/or conn_build_hdr_template/conn_prepend_hdr (for "header changed").
 */
#define COA_HEADER_CHANGED      0x0001
#define COA_ROUTE_CHANGED       0x0002
#define COA_RCVBUF_CHANGED      0x0004  /* SO_RCVBUF */
#define COA_SNDBUF_CHANGED      0x0008  /* SO_SNDBUF */
#define COA_WROFF_CHANGED       0x0010  /* Header size changed */
#define COA_ICMP_BIND_NEEDED    0x0020
#define COA_OOBINLINE_CHANGED   0x0040

#define TCP_PORTS_OFFSET        0
#define UDP_PORTS_OFFSET        0

/*
 * lookups return the ill/ipif only if the flags are clear OR Iam writer.
 * ill / ipif lookup functions increment the refcnt on the ill / ipif only
 * after calling these macros. This ensures that the refcnt on the ipif or
 * ill will eventually drop down to zero.
 */
#define ILL_LOOKUP_FAILED       1       /* Used as error code */
#define IPIF_LOOKUP_FAILED      2       /* Used as error code */

#define ILL_CAN_LOOKUP(ill)                                             \
        (!((ill)->ill_state_flags & ILL_CONDEMNED) ||                   \
        IAM_WRITER_ILL(ill))

#define ILL_IS_CONDEMNED(ill)   \
        ((ill)->ill_state_flags & ILL_CONDEMNED)

#define IPIF_CAN_LOOKUP(ipif)   \
        (!((ipif)->ipif_state_flags & IPIF_CONDEMNED) || \
        IAM_WRITER_IPIF(ipif))

#define IPIF_IS_CONDEMNED(ipif) \
        ((ipif)->ipif_state_flags & IPIF_CONDEMNED)

#define IPIF_IS_CHANGING(ipif)  \
        ((ipif)->ipif_state_flags & IPIF_CHANGING)

/* Macros used to assert that this thread is a writer */
#define IAM_WRITER_IPSQ(ipsq)   ((ipsq)->ipsq_xop->ipx_writer == curthread)
#define IAM_WRITER_ILL(ill)     IAM_WRITER_IPSQ((ill)->ill_phyint->phyint_ipsq)
#define IAM_WRITER_IPIF(ipif)   IAM_WRITER_ILL((ipif)->ipif_ill)

/*
 * Grab ill locks in the proper order. The order is highest addressed
 * ill is locked first.
 */
#define GRAB_ILL_LOCKS(ill_1, ill_2)                            \
{                                                               \
        if ((ill_1) > (ill_2)) {                                \
                if (ill_1 != NULL)                              \
                        mutex_enter(&(ill_1)->ill_lock);        \
                if (ill_2 != NULL)                              \
                        mutex_enter(&(ill_2)->ill_lock);        \
        } else {                                                \
                if (ill_2 != NULL)                              \
                        mutex_enter(&(ill_2)->ill_lock);        \
                if (ill_1 != NULL && ill_1 != ill_2)            \
                        mutex_enter(&(ill_1)->ill_lock);        \
        }                                                       \
}

#define RELEASE_ILL_LOCKS(ill_1, ill_2)         \
{                                               \
        if (ill_1 != NULL)                      \
                mutex_exit(&(ill_1)->ill_lock); \
        if (ill_2 != NULL && ill_2 != ill_1)    \
                mutex_exit(&(ill_2)->ill_lock); \
}

/* Get the other protocol instance ill */
#define ILL_OTHER(ill)                                          \
        ((ill)->ill_isv6 ? (ill)->ill_phyint->phyint_illv4 :    \
            (ill)->ill_phyint->phyint_illv6)

/* ioctl command info: Ioctl properties extracted and stored in here */
typedef struct cmd_info_s
{
        ipif_t  *ci_ipif;       /* ipif associated with [l]ifreq ioctl's */
        sin_t   *ci_sin;        /* the sin struct passed down */
        sin6_t  *ci_sin6;       /* the sin6_t struct passed down */
        struct lifreq *ci_lifr; /* the lifreq struct passed down */
} cmd_info_t;

extern struct kmem_cache *ire_cache;

extern ipaddr_t ip_g_all_ones;

extern uint_t   ip_loopback_mtu;        /* /etc/system */
extern uint_t   ip_loopback_mtuplus;
extern uint_t   ip_loopback_mtu_v6plus;

extern vmem_t *ip_minor_arena_sa;
extern vmem_t *ip_minor_arena_la;

/*
 * ip_g_forward controls IP forwarding.  It takes two values:
 *      0: IP_FORWARD_NEVER     Don't forward packets ever.
 *      1: IP_FORWARD_ALWAYS    Forward packets for elsewhere.
 *
 * RFC1122 says there must be a configuration switch to control forwarding,
 * but that the default MUST be to not forward packets ever.  Implicit
 * control based on configuration of multiple interfaces MUST NOT be
 * implemented (Section 3.1).  SunOS 4.1 did provide the "automatic" capability
 * and, in fact, it was the default.  That capability is now provided in the
 * /etc/rc2.d/S69inet script.
 */

#define ips_ip_respond_to_address_mask_broadcast \
                                        ips_propinfo_tbl[0].prop_cur_bval
#define ips_ip_g_resp_to_echo_bcast     ips_propinfo_tbl[1].prop_cur_bval
#define ips_ip_g_resp_to_echo_mcast     ips_propinfo_tbl[2].prop_cur_bval
#define ips_ip_g_resp_to_timestamp      ips_propinfo_tbl[3].prop_cur_bval
#define ips_ip_g_resp_to_timestamp_bcast ips_propinfo_tbl[4].prop_cur_bval
#define ips_ip_g_send_redirects         ips_propinfo_tbl[5].prop_cur_bval
#define ips_ip_g_forward_directed_bcast ips_propinfo_tbl[6].prop_cur_bval
#define ips_ip_mrtdebug                 ips_propinfo_tbl[7].prop_cur_uval
#define ips_ip_ire_reclaim_fraction     ips_propinfo_tbl[8].prop_cur_uval
#define ips_ip_nce_reclaim_fraction     ips_propinfo_tbl[9].prop_cur_uval
#define ips_ip_dce_reclaim_fraction     ips_propinfo_tbl[10].prop_cur_uval
#define ips_ip_def_ttl                  ips_propinfo_tbl[11].prop_cur_uval
#define ips_ip_forward_src_routed       ips_propinfo_tbl[12].prop_cur_bval
#define ips_ip_wroff_extra              ips_propinfo_tbl[13].prop_cur_uval
#define ips_ip_pathmtu_interval         ips_propinfo_tbl[14].prop_cur_uval
#define ips_ip_icmp_return              ips_propinfo_tbl[15].prop_cur_uval
#define ips_ip_path_mtu_discovery       ips_propinfo_tbl[16].prop_cur_bval
#define ips_ip_pmtu_min                 ips_propinfo_tbl[17].prop_cur_uval
#define ips_ip_ignore_redirect          ips_propinfo_tbl[18].prop_cur_bval
#define ips_ip_arp_icmp_error           ips_propinfo_tbl[19].prop_cur_bval
#define ips_ip_broadcast_ttl            ips_propinfo_tbl[20].prop_cur_uval
#define ips_ip_icmp_err_interval        ips_propinfo_tbl[21].prop_cur_uval
#define ips_ip_icmp_err_burst           ips_propinfo_tbl[22].prop_cur_uval
#define ips_ip_reass_queue_bytes        ips_propinfo_tbl[23].prop_cur_uval
#define ips_ip_strict_dst_multihoming   ips_propinfo_tbl[24].prop_cur_uval
#define ips_ip_addrs_per_if             ips_propinfo_tbl[25].prop_cur_uval
#define ips_ipsec_override_persocket_policy ips_propinfo_tbl[26].prop_cur_bval
#define ips_icmp_accept_clear_messages  ips_propinfo_tbl[27].prop_cur_bval
#define ips_igmp_accept_clear_messages  ips_propinfo_tbl[28].prop_cur_bval

/* IPv6 configuration knobs */
#define ips_delay_first_probe_time      ips_propinfo_tbl[29].prop_cur_uval
#define ips_max_unicast_solicit         ips_propinfo_tbl[30].prop_cur_uval
#define ips_ipv6_def_hops               ips_propinfo_tbl[31].prop_cur_uval
#define ips_ipv6_icmp_return            ips_propinfo_tbl[32].prop_cur_uval
#define ips_ipv6_forward_src_routed     ips_propinfo_tbl[33].prop_cur_bval
#define ips_ipv6_resp_echo_mcast        ips_propinfo_tbl[34].prop_cur_bval
#define ips_ipv6_send_redirects         ips_propinfo_tbl[35].prop_cur_bval
#define ips_ipv6_ignore_redirect        ips_propinfo_tbl[36].prop_cur_bval
#define ips_ipv6_strict_dst_multihoming ips_propinfo_tbl[37].prop_cur_uval
#define ips_src_check                   ips_propinfo_tbl[38].prop_cur_uval
#define ips_ipsec_policy_log_interval   ips_propinfo_tbl[39].prop_cur_uval
#define ips_pim_accept_clear_messages   ips_propinfo_tbl[40].prop_cur_bval
#define ips_ip_ndp_unsolicit_interval   ips_propinfo_tbl[41].prop_cur_uval
#define ips_ip_ndp_unsolicit_count      ips_propinfo_tbl[42].prop_cur_uval
#define ips_ipv6_ignore_home_address_opt ips_propinfo_tbl[43].prop_cur_bval

/* Misc IP configuration knobs */
#define ips_ip_policy_mask              ips_propinfo_tbl[44].prop_cur_uval
#define ips_ip_ecmp_behavior            ips_propinfo_tbl[45].prop_cur_uval
#define ips_ip_multirt_ttl              ips_propinfo_tbl[46].prop_cur_uval
#define ips_ip_ire_badcnt_lifetime      ips_propinfo_tbl[47].prop_cur_uval
#define ips_ip_max_temp_idle            ips_propinfo_tbl[48].prop_cur_uval
#define ips_ip_max_temp_defend          ips_propinfo_tbl[49].prop_cur_uval
#define ips_ip_max_defend               ips_propinfo_tbl[50].prop_cur_uval
#define ips_ip_defend_interval          ips_propinfo_tbl[51].prop_cur_uval
#define ips_ip_dup_recovery             ips_propinfo_tbl[52].prop_cur_uval
#define ips_ip_restrict_interzone_loopback ips_propinfo_tbl[53].prop_cur_bval
#define ips_ip_lso_outbound             ips_propinfo_tbl[54].prop_cur_bval
#define ips_igmp_max_version            ips_propinfo_tbl[55].prop_cur_uval
#define ips_mld_max_version             ips_propinfo_tbl[56].prop_cur_uval
#define ips_ip_forwarding               ips_propinfo_tbl[57].prop_cur_bval
#define ips_ipv6_forwarding             ips_propinfo_tbl[58].prop_cur_bval
#define ips_ip_reassembly_timeout       ips_propinfo_tbl[59].prop_cur_uval
#define ips_ipv6_reassembly_timeout     ips_propinfo_tbl[60].prop_cur_uval
#define ips_ip_cgtp_filter              ips_propinfo_tbl[61].prop_cur_bval
#define ips_arp_probe_delay             ips_propinfo_tbl[62].prop_cur_uval
#define ips_arp_fastprobe_delay         ips_propinfo_tbl[63].prop_cur_uval
#define ips_arp_probe_interval          ips_propinfo_tbl[64].prop_cur_uval
#define ips_arp_fastprobe_interval      ips_propinfo_tbl[65].prop_cur_uval
#define ips_arp_probe_count             ips_propinfo_tbl[66].prop_cur_uval
#define ips_arp_fastprobe_count         ips_propinfo_tbl[67].prop_cur_uval
#define ips_ipv4_dad_announce_interval  ips_propinfo_tbl[68].prop_cur_uval
#define ips_ipv6_dad_announce_interval  ips_propinfo_tbl[69].prop_cur_uval
#define ips_arp_defend_interval         ips_propinfo_tbl[70].prop_cur_uval
#define ips_arp_defend_rate             ips_propinfo_tbl[71].prop_cur_uval
#define ips_ndp_defend_interval         ips_propinfo_tbl[72].prop_cur_uval
#define ips_ndp_defend_rate             ips_propinfo_tbl[73].prop_cur_uval
#define ips_arp_defend_period           ips_propinfo_tbl[74].prop_cur_uval
#define ips_ndp_defend_period           ips_propinfo_tbl[75].prop_cur_uval
#define ips_ipv4_icmp_return_pmtu       ips_propinfo_tbl[76].prop_cur_bval
#define ips_ipv6_icmp_return_pmtu       ips_propinfo_tbl[77].prop_cur_bval
#define ips_ip_arp_publish_count        ips_propinfo_tbl[78].prop_cur_uval
#define ips_ip_arp_publish_interval     ips_propinfo_tbl[79].prop_cur_uval
#define ips_ip_strict_src_multihoming   ips_propinfo_tbl[80].prop_cur_uval
#define ips_ipv6_strict_src_multihoming ips_propinfo_tbl[81].prop_cur_uval
#define ips_ipv6_drop_inbound_icmpv6    ips_propinfo_tbl[82].prop_cur_bval
#define ips_ip_dce_reclaim_threshold    ips_propinfo_tbl[83].prop_cur_uval

extern int      dohwcksum;      /* use h/w cksum if supported by the h/w */
#ifdef ZC_TEST
extern int      noswcksum;
#endif

extern char     ipif_loopback_name[];

extern nv_t     *ire_nv_tbl;

extern struct module_info ip_mod_info;

#define HOOKS4_INTERESTED_PHYSICAL_IN(ipst)     \
        ((ipst)->ips_ip4_physical_in_event.he_interested)
#define HOOKS6_INTERESTED_PHYSICAL_IN(ipst)     \
        ((ipst)->ips_ip6_physical_in_event.he_interested)
#define HOOKS4_INTERESTED_PHYSICAL_OUT(ipst)    \
        ((ipst)->ips_ip4_physical_out_event.he_interested)
#define HOOKS6_INTERESTED_PHYSICAL_OUT(ipst)    \
        ((ipst)->ips_ip6_physical_out_event.he_interested)
#define HOOKS4_INTERESTED_FORWARDING(ipst)      \
        ((ipst)->ips_ip4_forwarding_event.he_interested)
#define HOOKS6_INTERESTED_FORWARDING(ipst)      \
        ((ipst)->ips_ip6_forwarding_event.he_interested)
#define HOOKS4_INTERESTED_LOOPBACK_IN(ipst)     \
        ((ipst)->ips_ip4_loopback_in_event.he_interested)
#define HOOKS6_INTERESTED_LOOPBACK_IN(ipst)     \
        ((ipst)->ips_ip6_loopback_in_event.he_interested)
#define HOOKS4_INTERESTED_LOOPBACK_OUT(ipst)    \
        ((ipst)->ips_ip4_loopback_out_event.he_interested)
#define HOOKS6_INTERESTED_LOOPBACK_OUT(ipst)    \
        ((ipst)->ips_ip6_loopback_out_event.he_interested)
/*
 * Hooks marcos used inside of ip
 * The callers use the above INTERESTED macros first, hence
 * the he_interested check is superflous.
 */
#define FW_HOOKS(_hook, _event, _ilp, _olp, _iph, _fm, _m, _llm, ipst, _err) \
        if ((_hook).he_interested) {                                    \
                hook_pkt_event_t info;                                  \
                                                                        \
                _NOTE(CONSTCOND)                                        \
                ASSERT((_ilp != NULL) || (_olp != NULL));               \
                                                                        \
                FW_SET_ILL_INDEX(info.hpe_ifp, (ill_t *)_ilp);          \
                FW_SET_ILL_INDEX(info.hpe_ofp, (ill_t *)_olp);          \
                info.hpe_protocol = ipst->ips_ipv4_net_data;            \
                info.hpe_hdr = _iph;                                    \
                info.hpe_mp = &(_fm);                                   \
                info.hpe_mb = _m;                                       \
                info.hpe_flags = _llm;                                  \
                _err = hook_run(ipst->ips_ipv4_net_data->netd_hooks,    \
                    _event, (hook_data_t)&info);                        \
                if (_err != 0) {                                        \
                        ip2dbg(("%s hook dropped mblk chain %p hdr %p\n",\
                            (_hook).he_name, (void *)_fm, (void *)_m)); \
                        if (_fm != NULL) {                              \
                                freemsg(_fm);                           \
                                _fm = NULL;                             \
                        }                                               \
                        _iph = NULL;                                    \
                        _m = NULL;                                      \
                } else {                                                \
                        _iph = info.hpe_hdr;                            \
                        _m = info.hpe_mb;                               \
                }                                                       \
        }

#define FW_HOOKS6(_hook, _event, _ilp, _olp, _iph, _fm, _m, _llm, ipst, _err) \
        if ((_hook).he_interested) {                                    \
                hook_pkt_event_t info;                                  \
                                                                        \
                _NOTE(CONSTCOND)                                        \
                ASSERT((_ilp != NULL) || (_olp != NULL));               \
                                                                        \
                FW_SET_ILL_INDEX(info.hpe_ifp, (ill_t *)_ilp);          \
                FW_SET_ILL_INDEX(info.hpe_ofp, (ill_t *)_olp);          \
                info.hpe_protocol = ipst->ips_ipv6_net_data;            \
                info.hpe_hdr = _iph;                                    \
                info.hpe_mp = &(_fm);                                   \
                info.hpe_mb = _m;                                       \
                info.hpe_flags = _llm;                                  \
                _err = hook_run(ipst->ips_ipv6_net_data->netd_hooks,    \
                    _event, (hook_data_t)&info);                        \
                if (_err != 0) {                                        \
                        ip2dbg(("%s hook dropped mblk chain %p hdr %p\n",\
                            (_hook).he_name, (void *)_fm, (void *)_m)); \
                        if (_fm != NULL) {                              \
                                freemsg(_fm);                           \
                                _fm = NULL;                             \
                        }                                               \
                        _iph = NULL;                                    \
                        _m = NULL;                                      \
                } else {                                                \
                        _iph = info.hpe_hdr;                            \
                        _m = info.hpe_mb;                               \
                }                                                       \
        }

#define FW_SET_ILL_INDEX(fp, ill)                                       \
        _NOTE(CONSTCOND)                                                \
        if ((ill) == NULL || (ill)->ill_phyint == NULL) {               \
                (fp) = 0;                                               \
                _NOTE(CONSTCOND)                                        \
        } else if (IS_UNDER_IPMP(ill)) {                                \
                (fp) = ipmp_ill_get_ipmp_ifindex(ill);                  \
        } else {                                                        \
                (fp) = (ill)->ill_phyint->phyint_ifindex;               \
        }

/*
 * Network byte order macros
 */
#ifdef  _BIG_ENDIAN
#define N_IN_CLASSA_NET         IN_CLASSA_NET
#define N_IN_CLASSD_NET         IN_CLASSD_NET
#define N_INADDR_UNSPEC_GROUP   INADDR_UNSPEC_GROUP
#define N_IN_LOOPBACK_NET       (ipaddr_t)0x7f000000U
#else /* _BIG_ENDIAN */
#define N_IN_CLASSA_NET         (ipaddr_t)0x000000ffU
#define N_IN_CLASSD_NET         (ipaddr_t)0x000000f0U
#define N_INADDR_UNSPEC_GROUP   (ipaddr_t)0x000000e0U
#define N_IN_LOOPBACK_NET       (ipaddr_t)0x0000007fU
#endif /* _BIG_ENDIAN */
#define CLASSD(addr)    (((addr) & N_IN_CLASSD_NET) == N_INADDR_UNSPEC_GROUP)
#define CLASSE(addr)    (((addr) & N_IN_CLASSD_NET) == N_IN_CLASSD_NET)
#define IP_LOOPBACK_ADDR(addr)                  \
        (((addr) & N_IN_CLASSA_NET == N_IN_LOOPBACK_NET))

extern int      ip_debug;
extern uint_t   ip_thread_data;
extern krwlock_t ip_thread_rwlock;
extern list_t   ip_thread_list;

#ifdef IP_DEBUG
#include <sys/debug.h>
#include <sys/promif.h>

#define ip0dbg(a)       printf a
#define ip1dbg(a)       if (ip_debug > 2) printf a
#define ip2dbg(a)       if (ip_debug > 3) printf a
#define ip3dbg(a)       if (ip_debug > 4) printf a
#else
#define ip0dbg(a)       /* */
#define ip1dbg(a)       /* */
#define ip2dbg(a)       /* */
#define ip3dbg(a)       /* */
#endif  /* IP_DEBUG */

/* Default MAC-layer address string length for mac_colon_addr */
#define MAC_STR_LEN     128

struct  mac_header_info_s;

extern void     ill_frag_timer(void *);
extern ill_t    *ill_first(int, int, ill_walk_context_t *, ip_stack_t *);
extern ill_t    *ill_next(ill_walk_context_t *, ill_t *);
extern void     ill_frag_timer_start(ill_t *);
extern void     ill_nic_event_dispatch(ill_t *, lif_if_t, nic_event_t,
    nic_event_data_t, size_t);
extern mblk_t   *ip_carve_mp(mblk_t **, ssize_t);
extern mblk_t   *ip_dlpi_alloc(size_t, t_uscalar_t);
extern mblk_t   *ip_dlnotify_alloc(uint_t, uint_t);
extern mblk_t   *ip_dlnotify_alloc2(uint_t, uint_t, uint_t);
extern char     *ip_dot_addr(ipaddr_t, char *);
extern const char *mac_colon_addr(const uint8_t *, size_t, char *, size_t);
extern int      ip_lwput(queue_t *, mblk_t *);
extern boolean_t icmp_err_rate_limit(ip_stack_t *);
extern void     icmp_frag_needed(mblk_t *, int, ip_recv_attr_t *);
extern mblk_t   *icmp_inbound_v4(mblk_t *, ip_recv_attr_t *);
extern void     icmp_time_exceeded(mblk_t *, uint8_t, ip_recv_attr_t *);
extern void     icmp_unreachable(mblk_t *, uint8_t, ip_recv_attr_t *);
extern boolean_t ip_ipsec_policy_inherit(conn_t *, conn_t *, ip_recv_attr_t *);
extern void     *ip_pullup(mblk_t *, ssize_t, ip_recv_attr_t *);
extern void     ip_setl2src(mblk_t *, ip_recv_attr_t *, ill_t *);
extern mblk_t   *ip_check_and_align_header(mblk_t *, uint_t, ip_recv_attr_t *);
extern mblk_t   *ip_check_length(mblk_t *, uchar_t *, ssize_t, uint_t, uint_t,
    ip_recv_attr_t *);
extern mblk_t   *ip_check_optlen(mblk_t *, ipha_t *, uint_t, uint_t,
    ip_recv_attr_t *);
extern mblk_t   *ip_fix_dbref(mblk_t *, ip_recv_attr_t *);
extern uint_t   ip_cksum(mblk_t *, int, uint32_t);
extern int      ip_close(queue_t *, int, cred_t *);
extern uint16_t ip_csum_hdr(ipha_t *);
extern void     ip_forward_xmit_v4(nce_t *, ill_t *, mblk_t *, ipha_t *,
    ip_recv_attr_t *, uint32_t, uint32_t);
extern boolean_t ip_forward_options(mblk_t *, ipha_t *, ill_t *,
    ip_recv_attr_t *);
extern int      ip_fragment_v4(mblk_t *, nce_t *, iaflags_t, uint_t, uint32_t,
    uint32_t, zoneid_t, zoneid_t, pfirepostfrag_t postfragfn,
    uintptr_t *cookie);
extern void     ip_proto_not_sup(mblk_t *, ip_recv_attr_t *);
extern void     ip_ire_g_fini(void);
extern void     ip_ire_g_init(void);
extern void     ip_ire_fini(ip_stack_t *);
extern void     ip_ire_init(ip_stack_t *);
extern void     ip_mdata_to_mhi(ill_t *, mblk_t *, struct mac_header_info_s *);
extern int      ip_openv4(queue_t *q, dev_t *devp, int flag, int sflag,
                    cred_t *credp);
extern int      ip_openv6(queue_t *q, dev_t *devp, int flag, int sflag,
                    cred_t *credp);
extern int      ip_reassemble(mblk_t *, ipf_t *, uint_t, boolean_t, ill_t *,
    size_t);
extern int      ip_rput(queue_t *, mblk_t *);
extern void     ip_input(ill_t *, ill_rx_ring_t *, mblk_t *,
    struct mac_header_info_s *);
extern void     ip_input_v6(ill_t *, ill_rx_ring_t *, mblk_t *,
    struct mac_header_info_s *);
extern mblk_t   *ip_input_common_v4(ill_t *, ill_rx_ring_t *, mblk_t *,
    struct mac_header_info_s *, squeue_t *, mblk_t **, uint_t *);
extern mblk_t   *ip_input_common_v6(ill_t *, ill_rx_ring_t *, mblk_t *,
    struct mac_header_info_s *, squeue_t *, mblk_t **, uint_t *);
extern void     ill_input_full_v4(mblk_t *, void *, void *,
    ip_recv_attr_t *, rtc_t *);
extern void     ill_input_short_v4(mblk_t *, void *, void *,
    ip_recv_attr_t *, rtc_t *);
extern void     ill_input_full_v6(mblk_t *, void *, void *,
    ip_recv_attr_t *, rtc_t *);
extern void     ill_input_short_v6(mblk_t *, void *, void *,
    ip_recv_attr_t *, rtc_t *);
extern ipaddr_t ip_input_options(ipha_t *, ipaddr_t, mblk_t *,
    ip_recv_attr_t *, int *);
extern boolean_t ip_input_local_options(mblk_t *, ipha_t *, ip_recv_attr_t *);
extern mblk_t   *ip_input_fragment(mblk_t *, ipha_t *, ip_recv_attr_t *);
extern mblk_t   *ip_input_fragment_v6(mblk_t *, ip6_t *, ip6_frag_t *, uint_t,
    ip_recv_attr_t *);
extern void     ip_input_post_ipsec(mblk_t *, ip_recv_attr_t *);
extern void     ip_fanout_v4(mblk_t *, ipha_t *, ip_recv_attr_t *);
extern void     ip_fanout_v6(mblk_t *, ip6_t *, ip_recv_attr_t *);
extern void     ip_fanout_proto_conn(conn_t *, mblk_t *, ipha_t *, ip6_t *,
    ip_recv_attr_t *);
extern void     ip_fanout_proto_v4(mblk_t *, ipha_t *, ip_recv_attr_t *);
extern void     ip_fanout_send_icmp_v4(mblk_t *, uint_t, uint_t,
    ip_recv_attr_t *);
extern void     ip_fanout_udp_conn(conn_t *, mblk_t *, ipha_t *, ip6_t *,
    ip_recv_attr_t *);
extern void     ip_fanout_udp_multi_v4(mblk_t *, ipha_t *, uint16_t, uint16_t,
    ip_recv_attr_t *);
extern mblk_t   *zero_spi_check(mblk_t *, ip_recv_attr_t *);
extern void     ip_build_hdrs_v4(uchar_t *, uint_t, const ip_pkt_t *, uint8_t);
extern int      ip_find_hdr_v4(ipha_t *, ip_pkt_t *, boolean_t);
extern int      ip_total_hdrs_len_v4(const ip_pkt_t *);

extern mblk_t   *ip_accept_tcp(ill_t *, ill_rx_ring_t *, squeue_t *,
    mblk_t *, mblk_t **, uint_t *cnt);
extern mblk_t   *ip_accept_tcp_v6(ill_t *, ill_rx_ring_t *, squeue_t *,
    mblk_t *, mblk_t **, uint_t *cnt);
extern void     ip_rput_dlpi(ill_t *, mblk_t *);
extern void     ip_rput_notdata(ill_t *, mblk_t *);

extern void     ip_mib2_add_ip_stats(mib2_ipIfStatsEntry_t *,
                    mib2_ipIfStatsEntry_t *);
extern void     ip_mib2_add_icmp6_stats(mib2_ipv6IfIcmpEntry_t *,
                    mib2_ipv6IfIcmpEntry_t *);
extern void     ip_rput_other(ipsq_t *, queue_t *, mblk_t *, void *);
extern ire_t    *ip_check_multihome(void *, ire_t *, ill_t *);
extern void     ip_send_potential_redirect_v4(mblk_t *, ipha_t *, ire_t *,
    ip_recv_attr_t *);
extern int      ip_set_destination_v4(ipaddr_t *, ipaddr_t, ipaddr_t,
    ip_xmit_attr_t *, iulp_t *, uint32_t, uint_t);
extern int      ip_set_destination_v6(in6_addr_t *, const in6_addr_t *,
    const in6_addr_t *, ip_xmit_attr_t *, iulp_t *, uint32_t, uint_t);

extern int      ip_output_simple(mblk_t *, ip_xmit_attr_t *);
extern int      ip_output_simple_v4(mblk_t *, ip_xmit_attr_t *);
extern int      ip_output_simple_v6(mblk_t *, ip_xmit_attr_t *);
extern int      ip_output_options(mblk_t *, ipha_t *, ip_xmit_attr_t *,
    ill_t *);
extern void     ip_output_local_options(ipha_t *, ip_stack_t *);

extern ip_xmit_attr_t *conn_get_ixa(conn_t *, boolean_t);
extern ip_xmit_attr_t *conn_get_ixa_tryhard(conn_t *, boolean_t);
extern ip_xmit_attr_t *conn_replace_ixa(conn_t *, ip_xmit_attr_t *);
extern ip_xmit_attr_t *conn_get_ixa_exclusive(conn_t *);
extern ip_xmit_attr_t *ip_xmit_attr_duplicate(ip_xmit_attr_t *);
extern void     ip_xmit_attr_replace_tsl(ip_xmit_attr_t *, ts_label_t *);
extern void     ip_xmit_attr_restore_tsl(ip_xmit_attr_t *, cred_t *);
boolean_t       ip_recv_attr_replace_label(ip_recv_attr_t *, ts_label_t *);
extern void     ixa_inactive(ip_xmit_attr_t *);
extern void     ixa_refrele(ip_xmit_attr_t *);
extern boolean_t ixa_check_drain_insert(conn_t *, ip_xmit_attr_t *);
extern void     ixa_cleanup(ip_xmit_attr_t *);
extern void     ira_cleanup(ip_recv_attr_t *, boolean_t);
extern void     ixa_safe_copy(ip_xmit_attr_t *, ip_xmit_attr_t *);

extern int      conn_ip_output(mblk_t *, ip_xmit_attr_t *);
extern boolean_t ip_output_verify_local(ip_xmit_attr_t *);
extern mblk_t   *ip_output_process_local(mblk_t *, ip_xmit_attr_t *, boolean_t,
    boolean_t, conn_t *);

extern int      conn_opt_get(conn_opt_arg_t *, t_scalar_t, t_scalar_t,
    uchar_t *);
extern int      conn_opt_set(conn_opt_arg_t *, t_scalar_t, t_scalar_t, uint_t,
    uchar_t *, boolean_t, cred_t *);
extern boolean_t        conn_same_as_last_v4(conn_t *, sin_t *);
extern boolean_t        conn_same_as_last_v6(conn_t *, sin6_t *);
extern int      conn_update_label(const conn_t *, const ip_xmit_attr_t *,
    const in6_addr_t *, ip_pkt_t *);

extern int      ip_opt_set_multicast_group(conn_t *, t_scalar_t,
    uchar_t *, boolean_t, boolean_t);
extern int      ip_opt_set_multicast_sources(conn_t *, t_scalar_t,
    uchar_t *, boolean_t, boolean_t);
extern int      conn_getsockname(conn_t *, struct sockaddr *, uint_t *);
extern int      conn_getpeername(conn_t *, struct sockaddr *, uint_t *);

extern int      conn_build_hdr_template(conn_t *, uint_t, uint_t,
    const in6_addr_t *, const in6_addr_t *, uint32_t);
extern mblk_t   *conn_prepend_hdr(ip_xmit_attr_t *, const ip_pkt_t *,
    const in6_addr_t *, const in6_addr_t *, uint8_t, uint32_t, uint_t,
    mblk_t *, uint_t, uint_t, uint32_t *, int *);
extern void     ip_attr_newdst(ip_xmit_attr_t *);
extern void     ip_attr_nexthop(const ip_pkt_t *, const ip_xmit_attr_t *,
    const in6_addr_t *, in6_addr_t *);
extern int      conn_connect(conn_t *, iulp_t *, uint32_t);
extern int      ip_attr_connect(const conn_t *, ip_xmit_attr_t *,
    const in6_addr_t *, const in6_addr_t *, const in6_addr_t *, in_port_t,
    in6_addr_t *, iulp_t *, uint32_t);
extern int      conn_inherit_parent(conn_t *, conn_t *);

extern void     conn_ixa_cleanup(conn_t *connp, void *arg);

extern boolean_t conn_wantpacket(conn_t *, ip_recv_attr_t *, ipha_t *);
extern uint_t   ip_type_v4(ipaddr_t, ip_stack_t *);
extern uint_t   ip_type_v6(const in6_addr_t *, ip_stack_t *);

extern int      ip_wput_nondata(queue_t *, mblk_t *);
extern int      ip_wsrv(queue_t *);
extern char     *ip_nv_lookup(nv_t *, int);
extern boolean_t ip_local_addr_ok_v6(const in6_addr_t *, const in6_addr_t *);
extern boolean_t ip_remote_addr_ok_v6(const in6_addr_t *, const in6_addr_t *);
extern ipaddr_t ip_massage_options(ipha_t *, netstack_t *);
extern ipaddr_t ip_net_mask(ipaddr_t);
extern void     arp_bringup_done(ill_t *, int);
extern void     arp_replumb_done(ill_t *, int);

extern struct qinit iprinitv6;

extern void     ipmp_init(ip_stack_t *);
extern void     ipmp_destroy(ip_stack_t *);
extern ipmp_grp_t *ipmp_grp_create(const char *, phyint_t *);
extern void     ipmp_grp_destroy(ipmp_grp_t *);
extern void     ipmp_grp_info(const ipmp_grp_t *, lifgroupinfo_t *);
extern int      ipmp_grp_rename(ipmp_grp_t *, const char *);
extern ipmp_grp_t *ipmp_grp_lookup(const char *, ip_stack_t *);
extern int      ipmp_grp_vet_phyint(ipmp_grp_t *, phyint_t *);
extern ipmp_illgrp_t *ipmp_illgrp_create(ill_t *);
extern void     ipmp_illgrp_destroy(ipmp_illgrp_t *);
extern ill_t    *ipmp_illgrp_add_ipif(ipmp_illgrp_t *, ipif_t *);
extern void     ipmp_illgrp_del_ipif(ipmp_illgrp_t *, ipif_t *);
extern ill_t    *ipmp_illgrp_next_ill(ipmp_illgrp_t *);
extern ill_t    *ipmp_illgrp_hold_next_ill(ipmp_illgrp_t *);
extern ill_t    *ipmp_illgrp_hold_cast_ill(ipmp_illgrp_t *);
extern ill_t    *ipmp_illgrp_ipmp_ill(ipmp_illgrp_t *);
extern void     ipmp_illgrp_refresh_mtu(ipmp_illgrp_t *);
extern ipmp_arpent_t *ipmp_illgrp_create_arpent(ipmp_illgrp_t *,
    boolean_t, ipaddr_t, uchar_t *, size_t, uint16_t);
extern void     ipmp_illgrp_destroy_arpent(ipmp_illgrp_t *, ipmp_arpent_t *);
extern ipmp_arpent_t *ipmp_illgrp_lookup_arpent(ipmp_illgrp_t *, ipaddr_t *);
extern void     ipmp_illgrp_refresh_arpent(ipmp_illgrp_t *);
extern void     ipmp_illgrp_mark_arpent(ipmp_illgrp_t *, ipmp_arpent_t *);
extern ill_t    *ipmp_illgrp_find_ill(ipmp_illgrp_t *, uchar_t *, uint_t);
extern void     ipmp_illgrp_link_grp(ipmp_illgrp_t *, ipmp_grp_t *);
extern int      ipmp_illgrp_unlink_grp(ipmp_illgrp_t *);
extern uint_t   ipmp_ill_get_ipmp_ifindex(const ill_t *);
extern void     ipmp_ill_join_illgrp(ill_t *, ipmp_illgrp_t *);
extern void     ipmp_ill_leave_illgrp(ill_t *);
extern ill_t    *ipmp_ill_hold_ipmp_ill(ill_t *);
extern ill_t    *ipmp_ill_hold_xmit_ill(ill_t *, boolean_t);
extern boolean_t ipmp_ill_is_active(ill_t *);
extern void     ipmp_ill_refresh_active(ill_t *);
extern void     ipmp_phyint_join_grp(phyint_t *, ipmp_grp_t *);
extern void     ipmp_phyint_leave_grp(phyint_t *);
extern void     ipmp_phyint_refresh_active(phyint_t *);
extern ill_t    *ipmp_ipif_bound_ill(const ipif_t *);
extern ill_t    *ipmp_ipif_hold_bound_ill(const ipif_t *);
extern boolean_t ipmp_ipif_is_dataaddr(const ipif_t *);
extern boolean_t ipmp_ipif_is_stubaddr(const ipif_t *);
extern boolean_t ipmp_packet_is_probe(mblk_t *, ill_t *);
extern void     ipmp_ncec_delete_nce(ncec_t *);
extern void     ipmp_ncec_refresh_nce(ncec_t *);

extern void     conn_drain_insert(conn_t *, idl_tx_list_t *);
extern void     conn_setqfull(conn_t *, boolean_t *);
extern void     conn_clrqfull(conn_t *, boolean_t *);
extern int      conn_ipsec_length(conn_t *);
extern ipaddr_t ip_get_dst(ipha_t *);
extern uint_t   ip_get_pmtu(ip_xmit_attr_t *);
extern uint_t   ip_get_base_mtu(ill_t *, ire_t *);
extern mblk_t *ip_output_attach_policy(mblk_t *, ipha_t *, ip6_t *,
    const conn_t *, ip_xmit_attr_t *);
extern int      ipsec_out_extra_length(ip_xmit_attr_t *);
extern int      ipsec_out_process(mblk_t *, ip_xmit_attr_t *);
extern int      ip_output_post_ipsec(mblk_t *, ip_xmit_attr_t *);
extern void     ipsec_out_to_in(ip_xmit_attr_t *, ill_t *ill,
    ip_recv_attr_t *);

extern void     ire_cleanup(ire_t *);
extern void     ire_inactive(ire_t *);
extern boolean_t irb_inactive(irb_t *);
extern ire_t    *ire_unlink(irb_t *);

#ifdef DEBUG
extern  boolean_t th_trace_ref(const void *, ip_stack_t *);
extern  void    th_trace_unref(const void *);
extern  void    th_trace_cleanup(const void *, boolean_t);
extern  void    ire_trace_ref(ire_t *);
extern  void    ire_untrace_ref(ire_t *);
#endif

extern int      ip_srcid_insert(const in6_addr_t *, zoneid_t, ip_stack_t *);
extern int      ip_srcid_remove(const in6_addr_t *, zoneid_t, ip_stack_t *);
extern boolean_t ip_srcid_find_id(uint_t, in6_addr_t *, zoneid_t, boolean_t,
    netstack_t *);
extern uint_t   ip_srcid_find_addr(const in6_addr_t *, zoneid_t, netstack_t *);

extern uint8_t  ipoptp_next(ipoptp_t *);
extern uint8_t  ipoptp_first(ipoptp_t *, ipha_t *);
extern int      ip_opt_get_user(conn_t *, uchar_t *);
extern int      ipsec_req_from_conn(conn_t *, ipsec_req_t *, int);
extern int      ip_snmp_get(queue_t *q, mblk_t *mctl, int level, boolean_t);
extern int      ip_snmp_set(queue_t *q, int, int, uchar_t *, int);
extern void     ip_process_ioctl(ipsq_t *, queue_t *, mblk_t *, void *);
extern void     ip_quiesce_conn(conn_t *);
extern  void    ip_reprocess_ioctl(ipsq_t *, queue_t *, mblk_t *, void *);
extern void     ip_ioctl_finish(queue_t *, mblk_t *, int, int, ipsq_t *);

extern boolean_t ip_cmpbuf(const void *, uint_t, boolean_t, const void *,
    uint_t);
extern boolean_t ip_allocbuf(void **, uint_t *, boolean_t, const void *,
    uint_t);
extern void     ip_savebuf(void **, uint_t *, boolean_t, const void *, uint_t);

extern boolean_t        ipsq_pending_mp_cleanup(ill_t *, conn_t *);
extern void     conn_ioctl_cleanup(conn_t *);

extern void     ip_unbind(conn_t *);

extern void tnet_init(void);
extern void tnet_fini(void);

/*
 * Hook functions to enable cluster networking
 * On non-clustered systems these vectors must always be NULL.
 */
extern int (*cl_inet_isclusterwide)(netstackid_t stack_id, uint8_t protocol,
    sa_family_t addr_family, uint8_t *laddrp, void *args);
extern uint32_t (*cl_inet_ipident)(netstackid_t stack_id, uint8_t protocol,
    sa_family_t addr_family, uint8_t *laddrp, uint8_t *faddrp,
    void *args);
extern int (*cl_inet_connect2)(netstackid_t stack_id, uint8_t protocol,
    boolean_t is_outgoing, sa_family_t addr_family, uint8_t *laddrp,
    in_port_t lport, uint8_t *faddrp, in_port_t fport, void *args);
extern void (*cl_inet_getspi)(netstackid_t, uint8_t, uint8_t *, size_t,
    void *);
extern void (*cl_inet_getspi)(netstackid_t stack_id, uint8_t protocol,
    uint8_t *ptr, size_t len, void *args);
extern int (*cl_inet_checkspi)(netstackid_t stack_id, uint8_t protocol,
    uint32_t spi, void *args);
extern void (*cl_inet_deletespi)(netstackid_t stack_id, uint8_t protocol,
    uint32_t spi, void *args);
extern void (*cl_inet_idlesa)(netstackid_t, uint8_t, uint32_t,
    sa_family_t, in6_addr_t, in6_addr_t, void *);


/* Hooks for CGTP (multirt routes) filtering module */
#define CGTP_FILTER_REV_1       1
#define CGTP_FILTER_REV_2       2
#define CGTP_FILTER_REV_3       3
#define CGTP_FILTER_REV         CGTP_FILTER_REV_3

/* cfo_filter and cfo_filter_v6 hooks return values */
#define CGTP_IP_PKT_NOT_CGTP    0
#define CGTP_IP_PKT_PREMIUM     1
#define CGTP_IP_PKT_DUPLICATE   2

/* Version 3 of the filter interface */
typedef struct cgtp_filter_ops {
        int     cfo_filter_rev;                 /* CGTP_FILTER_REV_3 */
        int     (*cfo_change_state)(netstackid_t, int);
        int     (*cfo_add_dest_v4)(netstackid_t, ipaddr_t, ipaddr_t,
                    ipaddr_t, ipaddr_t);
        int     (*cfo_del_dest_v4)(netstackid_t, ipaddr_t, ipaddr_t);
        int     (*cfo_add_dest_v6)(netstackid_t, in6_addr_t *, in6_addr_t *,
                    in6_addr_t *, in6_addr_t *);
        int     (*cfo_del_dest_v6)(netstackid_t, in6_addr_t *, in6_addr_t *);
        int     (*cfo_filter)(netstackid_t, uint_t, mblk_t *);
        int     (*cfo_filter_v6)(netstackid_t, uint_t, ip6_t *,
                    ip6_frag_t *);
} cgtp_filter_ops_t;

#define CGTP_MCAST_SUCCESS      1

/*
 * The separate CGTP module needs this global symbol so that it
 * can check the version and determine whether to use the old or the new
 * version of the filtering interface.
 */
extern int      ip_cgtp_filter_rev;

extern int      ip_cgtp_filter_supported(void);
extern int      ip_cgtp_filter_register(netstackid_t, cgtp_filter_ops_t *);
extern int      ip_cgtp_filter_unregister(netstackid_t);
extern int      ip_cgtp_filter_is_registered(netstackid_t);

/*
 * rr_ring_state cycles in the order shown below from RR_FREE through
 * RR_FREE_IN_PROG and  back to RR_FREE.
 */
typedef enum {
        RR_FREE,                        /* Free slot */
        RR_SQUEUE_UNBOUND,              /* Ring's squeue is unbound */
        RR_SQUEUE_BIND_INPROG,          /* Ring's squeue bind in progress */
        RR_SQUEUE_BOUND,                /* Ring's squeue bound to cpu */
        RR_FREE_INPROG                  /* Ring is being freed */
} ip_ring_state_t;

#define ILL_MAX_RINGS           256     /* Max num of rx rings we can manage */
#define ILL_POLLING             0x01    /* Polling in use */

/*
 * These functions pointer types are exported by the mac/dls layer.
 * we need to duplicate the definitions here because we cannot
 * include mac/dls header files here.
 */
typedef boolean_t               (*ip_mac_intr_disable_t)(void *);
typedef int                     (*ip_mac_intr_enable_t)(void *);
typedef ip_mac_tx_cookie_t      (*ip_dld_tx_t)(void *, mblk_t *,
    uint64_t, uint16_t);
typedef void                    (*ip_flow_enable_t)(void *, ip_mac_tx_cookie_t);
typedef void                    *(*ip_dld_callb_t)(void *,
    ip_flow_enable_t, void *);
typedef boolean_t               (*ip_dld_fctl_t)(void *, ip_mac_tx_cookie_t);
typedef int                     (*ip_capab_func_t)(void *, uint_t,
    void *, uint_t);

/*
 * POLLING README
 * sq_get_pkts() is called to pick packets from softring in poll mode. It
 * calls rr_rx to get the chain and process it with rr_ip_accept.
 * rr_rx = mac_soft_ring_poll() to pick packets
 * rr_ip_accept = ip_accept_tcp() to process packets
 */

/*
 * XXX: With protocol, service specific squeues, they will have
 * specific acceptor functions.
 */
typedef mblk_t *(*ip_mac_rx_t)(void *, size_t);
typedef mblk_t *(*ip_accept_t)(ill_t *, ill_rx_ring_t *,
    squeue_t *, mblk_t *, mblk_t **, uint_t *);

/*
 * rr_intr_enable, rr_intr_disable, rr_rx_handle, rr_rx:
 * May be accessed while in the squeue AND after checking that SQS_POLL_CAPAB
 * is set.
 *
 * rr_ring_state: Protected by ill_lock.
 */
struct ill_rx_ring {
        ip_mac_intr_disable_t   rr_intr_disable; /* Interrupt disabling func */
        ip_mac_intr_enable_t    rr_intr_enable; /* Interrupt enabling func */
        void                    *rr_intr_handle; /* Handle interrupt funcs */
        ip_mac_rx_t             rr_rx;          /* Driver receive function */
        ip_accept_t             rr_ip_accept;   /* IP accept function */
        void                    *rr_rx_handle;  /* Handle for Rx ring */
        squeue_t                *rr_sqp; /* Squeue the ring is bound to */
        ill_t                   *rr_ill;        /* back pointer to ill */
        ip_ring_state_t         rr_ring_state;  /* State of this ring */
};

/*
 * IP - DLD direct function call capability
 * Suffixes, df - dld function, dh - dld handle,
 * cf - client (IP) function, ch - client handle
 */
typedef struct ill_dld_direct_s {               /* DLD provided driver Tx */
        ip_dld_tx_t             idd_tx_df;      /* str_mdata_fastpath_put */
        void                    *idd_tx_dh;     /* dld_str_t *dsp */
        ip_dld_callb_t          idd_tx_cb_df;   /* mac_tx_srs_notify */
        void                    *idd_tx_cb_dh;  /* mac_client_handle_t *mch */
        ip_dld_fctl_t           idd_tx_fctl_df; /* mac_tx_is_flow_blocked */
        void                    *idd_tx_fctl_dh;        /* mac_client_handle */
} ill_dld_direct_t;

/* IP - DLD polling capability */
typedef struct ill_dld_poll_s {
        ill_rx_ring_t           idp_ring_tbl[ILL_MAX_RINGS];
} ill_dld_poll_t;

/* Describes ill->ill_dld_capab */
struct ill_dld_capab_s {
        ip_capab_func_t         idc_capab_df;   /* dld_capab_func */
        void                    *idc_capab_dh;  /* dld_str_t *dsp */
        ill_dld_direct_t        idc_direct;
        ill_dld_poll_t          idc_poll;
};

/*
 * IP squeues exports
 */
extern boolean_t        ip_squeue_fanout;

#define IP_SQUEUE_GET(hint) ip_squeue_random(hint)

extern void ip_squeue_init(void (*)(squeue_t *));
extern squeue_t *ip_squeue_random(uint_t);
extern squeue_t *ip_squeue_get(ill_rx_ring_t *);
extern squeue_t *ip_squeue_getfree(pri_t);
extern int ip_squeue_cpu_move(squeue_t *, processorid_t);
extern void *ip_squeue_add_ring(ill_t *, void *);
extern void ip_squeue_bind_ring(ill_t *, ill_rx_ring_t *, processorid_t);
extern void ip_squeue_clean_ring(ill_t *, ill_rx_ring_t *);
extern void ip_squeue_quiesce_ring(ill_t *, ill_rx_ring_t *);
extern void ip_squeue_restart_ring(ill_t *, ill_rx_ring_t *);
extern void ip_squeue_clean_all(ill_t *);
extern boolean_t        ip_source_routed(ipha_t *, ip_stack_t *);

extern int tcp_wput(queue_t *, mblk_t *);

extern int      ip_fill_mtuinfo(conn_t *, ip_xmit_attr_t *,
    struct ip6_mtuinfo *);
extern hook_t *ipobs_register_hook(netstack_t *, pfv_t);
extern void ipobs_unregister_hook(netstack_t *, hook_t *);
extern void ipobs_hook(mblk_t *, int, zoneid_t, zoneid_t, const ill_t *,
    ip_stack_t *);
typedef void    (*ipsq_func_t)(ipsq_t *, queue_t *, mblk_t *, void *);

extern void     dce_g_init(void);
extern void     dce_g_destroy(void);
extern void     dce_stack_init(ip_stack_t *);
extern void     dce_stack_destroy(ip_stack_t *);
extern void     dce_cleanup(uint_t, ip_stack_t *);
extern dce_t    *dce_get_default(ip_stack_t *);
extern dce_t    *dce_lookup_pkt(mblk_t *, ip_xmit_attr_t *, uint_t *);
extern dce_t    *dce_lookup_v4(ipaddr_t, ip_stack_t *, uint_t *);
extern dce_t    *dce_lookup_v6(const in6_addr_t *, uint_t, ip_stack_t *,
    uint_t *);
extern dce_t    *dce_lookup_and_add_v4(ipaddr_t, ip_stack_t *);
extern dce_t    *dce_lookup_and_add_v6(const in6_addr_t *, uint_t,
    ip_stack_t *);
extern int      dce_update_uinfo_v4(ipaddr_t, iulp_t *, ip_stack_t *);
extern int      dce_update_uinfo_v6(const in6_addr_t *, uint_t, iulp_t *,
    ip_stack_t *);
extern int      dce_update_uinfo(const in6_addr_t *, uint_t, iulp_t *,
    ip_stack_t *);
extern void     dce_increment_generation(dce_t *);
extern void     dce_increment_all_generations(boolean_t, ip_stack_t *);
extern void     dce_refrele(dce_t *);
extern void     dce_refhold(dce_t *);
extern void     dce_refrele_notr(dce_t *);
extern void     dce_refhold_notr(dce_t *);
mblk_t          *ip_snmp_get_mib2_ip_dce(queue_t *, mblk_t *, ip_stack_t *ipst);

extern ip_laddr_t ip_laddr_verify_v4(ipaddr_t, zoneid_t,
    ip_stack_t *, boolean_t);
extern ip_laddr_t ip_laddr_verify_v6(const in6_addr_t *, zoneid_t,
    ip_stack_t *, boolean_t, uint_t);
extern int      ip_laddr_fanout_insert(conn_t *);

extern boolean_t ip_verify_src(mblk_t *, ip_xmit_attr_t *, uint_t *);
extern int      ip_verify_ire(mblk_t *, ip_xmit_attr_t *);

extern mblk_t   *ip_xmit_attr_to_mblk(ip_xmit_attr_t *);
extern boolean_t ip_xmit_attr_from_mblk(mblk_t *, ip_xmit_attr_t *);
extern mblk_t   *ip_xmit_attr_free_mblk(mblk_t *);
extern mblk_t   *ip_recv_attr_to_mblk(ip_recv_attr_t *);
extern boolean_t ip_recv_attr_from_mblk(mblk_t *, ip_recv_attr_t *);
extern mblk_t   *ip_recv_attr_free_mblk(mblk_t *);
extern boolean_t ip_recv_attr_is_mblk(mblk_t *);

#ifdef  __PRAGMA_REDEFINE_EXTNAME
#pragma redefine_extname inet_ntop _inet_ntop
#pragma redefine_extname inet_pton _inet_pton
#else
#define inet_ntop _inet_ntop
#define inet_pton _inet_pton
#endif  /* __PRAGMA_REDEFINE_EXTNAME */

extern char     *inet_ntop(int, const void *, char *, int);
extern int      inet_pton(int, char *, void *);

/*
 * Squeue tags. Tags only need to be unique when the callback function is the
 * same to distinguish between different calls, but we use unique tags for
 * convenience anyway.
 */
#define SQTAG_IP_INPUT                  1
#define SQTAG_TCP_INPUT_ICMP_ERR        2
#define SQTAG_TCP6_INPUT_ICMP_ERR       3
#define SQTAG_IP_TCP_INPUT              4
#define SQTAG_IP6_TCP_INPUT             5
#define SQTAG_IP_TCP_CLOSE              6
#define SQTAG_TCP_OUTPUT                7
#define SQTAG_TCP_TIMER                 8
#define SQTAG_TCP_TIMEWAIT              9
#define SQTAG_TCP_ACCEPT_FINISH         10
#define SQTAG_TCP_ACCEPT_FINISH_Q0      11
#define SQTAG_TCP_ACCEPT_PENDING        12
#define SQTAG_TCP_LISTEN_DISCON         13
#define SQTAG_TCP_CONN_REQ_1            14
#define SQTAG_TCP_EAGER_BLOWOFF         15
#define SQTAG_TCP_EAGER_CLEANUP         16
#define SQTAG_TCP_EAGER_CLEANUP_Q0      17
#define SQTAG_TCP_CONN_IND              18
#define SQTAG_TCP_RSRV                  19
#define SQTAG_TCP_ABORT_BUCKET          20
#define SQTAG_TCP_REINPUT               21
#define SQTAG_TCP_REINPUT_EAGER         22
#define SQTAG_TCP_INPUT_MCTL            23
#define SQTAG_TCP_RPUTOTHER             24
#define SQTAG_IP_PROTO_AGAIN            25
#define SQTAG_IP_FANOUT_TCP             26
#define SQTAG_IPSQ_CLEAN_RING           27
#define SQTAG_TCP_WPUT_OTHER            28
#define SQTAG_TCP_CONN_REQ_UNBOUND      29
#define SQTAG_TCP_SEND_PENDING          30
#define SQTAG_BIND_RETRY                31
#define SQTAG_UDP_FANOUT                32
#define SQTAG_UDP_INPUT                 33
#define SQTAG_UDP_WPUT                  34
#define SQTAG_UDP_OUTPUT                35
#define SQTAG_TCP_KSSL_INPUT            36
#define SQTAG_TCP_DROP_Q0               37
#define SQTAG_TCP_CONN_REQ_2            38
#define SQTAG_IP_INPUT_RX_RING          39
#define SQTAG_SQUEUE_CHANGE             40
#define SQTAG_CONNECT_FINISH            41
#define SQTAG_SYNCHRONOUS_OP            42
#define SQTAG_TCP_SHUTDOWN_OUTPUT       43
#define SQTAG_TCP_IXA_CLEANUP           44
#define SQTAG_TCP_SEND_SYNACK           45

extern sin_t    sin_null;       /* Zero address for quick clears */
extern sin6_t   sin6_null;      /* Zero address for quick clears */

#endif  /* _KERNEL */

#ifdef  __cplusplus
}
#endif

#endif  /* _INET_IP_H */