/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*-
 * Copyright (c) 1982, 1986, 1988, 1993
 *      The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "opt_ipsec.h"
#include "opt_inet6.h"

#include <sys/param.h>
#include <sys/errno.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/signalvar.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/stdarg.h>
#include <sys/sx.h>
#include <sys/syslog.h>

#include <net/if.h>
#include <net/if_var.h>
#include <net/if_private.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/vnet.h>

#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/in_pcb.h>

#include <netinet/icmp6.h>
#include <netinet/ip6.h>
#include <netinet/ip_var.h>
#include <netinet6/ip6_mroute.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/raw_ip6.h>
#include <netinet6/in6_fib.h>
#include <netinet6/scope6_var.h>
#include <netinet6/send.h>

#include <netipsec/ipsec_support.h>

#define satosin6(sa)    ((struct sockaddr_in6 *)(sa))
#define ifatoia6(ifa)   ((struct in6_ifaddr *)(ifa))

/*
 * Raw interface to IP6 protocol.
 */

VNET_DECLARE(struct inpcbinfo, ripcbinfo);
#define V_ripcbinfo                     VNET(ripcbinfo)

VNET_DECLARE(int, rip_bind_all_fibs);
#define V_rip_bind_all_fibs     VNET(rip_bind_all_fibs)

extern u_long   rip_sendspace;
extern u_long   rip_recvspace;

VNET_PCPUSTAT_DEFINE(struct rip6stat, rip6stat);
VNET_PCPUSTAT_SYSINIT(rip6stat);

#ifdef VIMAGE
VNET_PCPUSTAT_SYSUNINIT(rip6stat);
#endif /* VIMAGE */

/*
 * Hooks for multicast routing. They all default to NULL, so leave them not
 * initialized and rely on BSS being set to 0.
 */

/*
 * The socket used to communicate with the multicast routing daemon.
 */
VNET_DEFINE(bool, ip6_mrouting_enabled);

/*
 * The various mrouter functions.
 */
int (*ip6_mrouter_set)(struct socket *, struct sockopt *);
int (*ip6_mrouter_get)(struct socket *, struct sockopt *);
void (*ip6_mrouter_done)(struct socket *);
int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *);
int (*mrt6_ioctl)(u_long, caddr_t, int);

struct rip6_inp_match_ctx {
        struct ip6_hdr *ip6;
        int proto;
};

static bool
rip6_inp_match(const struct inpcb *inp, void *v)
{
        struct rip6_inp_match_ctx *c = v;
        struct ip6_hdr *ip6 = c->ip6;
        int proto = c->proto;

        /* XXX inp locking */
        if ((inp->inp_vflag & INP_IPV6) == 0)
                return (false);
        if (inp->inp_ip_p && inp->inp_ip_p != proto)
                return (false);
        if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
            !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ip6->ip6_dst))
                return (false);
        if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
            !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ip6->ip6_src))
                return (false);

        return (true);
}

/*
 * Setup generic address and protocol structures for raw_input routine, then
 * pass them along with mbuf chain.
 */
int
rip6_input(struct mbuf **mp, int *offp, int proto)
{
        struct ifnet *ifp;
        struct mbuf *n, *m = *mp;
        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
        struct inpcb *inp;
        struct mbuf *opts = NULL;
        struct sockaddr_in6 fromsa;
        struct rip6_inp_match_ctx ctx = { .ip6 = ip6, .proto = proto };
        struct inpcb_iterator inpi = INP_ITERATOR(&V_ripcbinfo,
            INPLOOKUP_RLOCKPCB, rip6_inp_match, &ctx);
        int delivered = 0, fib;

        M_ASSERTPKTHDR(m);
        NET_EPOCH_ASSERT();

        RIP6STAT_INC(rip6s_ipackets);

        init_sin6(&fromsa, m, 0); /* general init */

        fib = M_GETFIB(m);
        ifp = m->m_pkthdr.rcvif;

        while ((inp = inp_next(&inpi)) != NULL) {
                INP_RLOCK_ASSERT(inp);
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
                /*
                 * Check AH/ESP integrity.
                 */
                if (IPSEC_ENABLED(ipv6) &&
                    IPSEC_CHECK_POLICY(ipv6, m, inp) != 0) {
                        /* Do not inject data into pcb. */
                        continue;
                }
#endif /* IPSEC */
                if (jailed_without_vnet(inp->inp_cred) &&
                    !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
                    prison_check_ip6(inp->inp_cred, &ip6->ip6_dst) != 0)
                        /*
                         * Allow raw socket in jail to receive multicast;
                         * assume process had PRIV_NETINET_RAW at attach,
                         * and fall through into normal filter path if so.
                         */
                        continue;
                if (V_rip_bind_all_fibs == 0 && fib != inp->inp_inc.inc_fibnum)
                        /*
                         * Sockets bound to a specific FIB can only receive
                         * packets from that FIB.
                         */
                        continue;
                if (inp->in6p_cksum != -1) {
                        RIP6STAT_INC(rip6s_isum);
                        if (m->m_pkthdr.len - (*offp + inp->in6p_cksum) < 2 ||
                            in6_cksum(m, proto, *offp,
                            m->m_pkthdr.len - *offp)) {
                                RIP6STAT_INC(rip6s_badsum);
                                /*
                                 * Drop the received message, don't send an
                                 * ICMP6 message. Set proto to IPPROTO_NONE
                                 * to achieve that.
                                 */
                                INP_RUNLOCK(inp);
                                proto = IPPROTO_NONE;
                                break;
                        }
                }
                /*
                 * If this raw socket has multicast state, and we
                 * have received a multicast, check if this socket
                 * should receive it, as multicast filtering is now
                 * the responsibility of the transport layer.
                 */
                if (inp->in6p_moptions &&
                    IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                        /*
                         * If the incoming datagram is for MLD, allow it
                         * through unconditionally to the raw socket.
                         *
                         * Use the M_RTALERT_MLD flag to check for MLD
                         * traffic without having to inspect the mbuf chain
                         * more deeply, as all MLDv1/v2 host messages MUST
                         * contain the Router Alert option.
                         *
                         * In the case of MLDv1, we may not have explicitly
                         * joined the group, and may have set IFF_ALLMULTI
                         * on the interface. im6o_mc_filter() may discard
                         * control traffic we actually need to see.
                         *
                         * Userland multicast routing daemons should continue
                         * filter the control traffic appropriately.
                         */
                        int blocked;

                        blocked = MCAST_PASS;
                        if ((m->m_flags & M_RTALERT_MLD) == 0) {
                                struct sockaddr_in6 mcaddr;

                                bzero(&mcaddr, sizeof(struct sockaddr_in6));
                                mcaddr.sin6_len = sizeof(struct sockaddr_in6);
                                mcaddr.sin6_family = AF_INET6;
                                mcaddr.sin6_addr = ip6->ip6_dst;

                                blocked = im6o_mc_filter(inp->in6p_moptions,
                                    ifp,
                                    (struct sockaddr *)&mcaddr,
                                    (struct sockaddr *)&fromsa);
                        }
                        if (blocked != MCAST_PASS) {
                                IP6STAT_INC(ip6s_notmember);
                                continue;
                        }
                }
                if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL)
                        continue;
                if (inp->inp_flags & INP_CONTROLOPTS ||
                    inp->inp_socket->so_options & SO_TIMESTAMP)
                        ip6_savecontrol(inp, n, &opts);
                /* strip intermediate headers */
                m_adj(n, *offp);
                if (sbappendaddr(&inp->inp_socket->so_rcv,
                    (struct sockaddr *)&fromsa, n, opts) == 0) {
                        soroverflow(inp->inp_socket);
                        m_freem(n);
                        if (opts)
                                m_freem(opts);
                        RIP6STAT_INC(rip6s_fullsock);
                } else {
                        sorwakeup(inp->inp_socket);
                        delivered++;
                }
                opts = NULL;
        }
        if (delivered == 0) {
                RIP6STAT_INC(rip6s_nosock);
                if (m->m_flags & M_MCAST)
                        RIP6STAT_INC(rip6s_nosockmcast);
                if (proto == IPPROTO_NONE)
                        m_freem(m);
                else
                        icmp6_error(m, ICMP6_PARAM_PROB,
                            ICMP6_PARAMPROB_NEXTHEADER,
                            ip6_get_prevhdr(m, *offp));
                IP6STAT_DEC(ip6s_delivered);
        } else
                m_freem(m);
        return (IPPROTO_DONE);
}

void
rip6_ctlinput(struct ip6ctlparam *ip6cp)
{
        int errno;

        if ((errno = icmp6_errmap(ip6cp->ip6c_icmp6)) != 0)
                in6_pcbnotify(&V_ripcbinfo, ip6cp->ip6c_finaldst, 0,
                    ip6cp->ip6c_src, 0, errno, ip6cp->ip6c_cmdarg,
                    in6_rtchange);
}

/*
 * Generate IPv6 header and pass packet to ip6_output.  Tack on options user
 * may have setup with control call.
 */
static int
rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
    struct mbuf *control, struct thread *td)
{
        struct epoch_tracker et;
        struct inpcb *inp;
        struct sockaddr_in6 tmp, *dstsock;
        struct m_tag *mtag;
        struct ip6_hdr *ip6;
        u_int   plen = m->m_pkthdr.len;
        struct ip6_pktopts opt, *optp;
        struct ifnet *oifp = NULL;
        int error;
        int type = 0, code = 0;         /* for ICMPv6 output statistics only */
        int scope_ambiguous = 0;
        int use_defzone = 0;
        int hlim = 0;
        struct in6_addr in6a;
        uint32_t hash_type, hash_val;

        inp = sotoinpcb(so);
        KASSERT(inp != NULL, ("rip6_send: inp == NULL"));

        /* Always copy sockaddr to avoid overwrites. */
        /* Unlocked read. */
        if (so->so_state & SS_ISCONNECTED) {
                if (nam) {
                        error = EISCONN;
                        goto release;
                }
                tmp = (struct sockaddr_in6 ){
                        .sin6_family = AF_INET6,
                        .sin6_len = sizeof(struct sockaddr_in6),
                };
                INP_RLOCK(inp);
                bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
                    sizeof(struct in6_addr));
                INP_RUNLOCK(inp);
                dstsock = &tmp;
        } else {
                if (nam == NULL)
                        error = ENOTCONN;
                else if (nam->sa_family != AF_INET6)
                        error = EAFNOSUPPORT;
                else if (nam->sa_len != sizeof(struct sockaddr_in6))
                        error = EINVAL;
                else
                        error = 0;
                if (error != 0)
                        goto release;
                dstsock = (struct sockaddr_in6 *)nam;
                if (dstsock->sin6_family != AF_INET6) {
                        error = EAFNOSUPPORT;
                        goto release;
                }
        }

        INP_WLOCK(inp);

        if (control != NULL) {
                NET_EPOCH_ENTER(et);
                error = ip6_setpktopts(control, &opt, inp->in6p_outputopts,
                    so->so_cred, inp->inp_ip_p);
                NET_EPOCH_EXIT(et);

                if (error != 0) {
                        goto bad;
                }
                optp = &opt;
        } else
                optp = inp->in6p_outputopts;

        /*
         * Check and convert scope zone ID into internal form.
         *
         * XXX: we may still need to determine the zone later.
         */
        if (!(so->so_state & SS_ISCONNECTED)) {
                if (!optp || !optp->ip6po_pktinfo ||
                    !optp->ip6po_pktinfo->ipi6_ifindex)
                        use_defzone = V_ip6_use_defzone;
                if (dstsock->sin6_scope_id == 0 && !use_defzone)
                        scope_ambiguous = 1;
                if ((error = sa6_embedscope(dstsock, use_defzone)) != 0)
                        goto bad;
        }

        /*
         * For an ICMPv6 packet, we should know its type and code to update
         * statistics.
         */
        if (inp->inp_ip_p == IPPROTO_ICMPV6) {
                struct icmp6_hdr *icmp6;
                if (m->m_len < sizeof(struct icmp6_hdr) &&
                    (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
                        error = ENOBUFS;
                        goto bad;
                }
                icmp6 = mtod(m, struct icmp6_hdr *);
                type = icmp6->icmp6_type;
                code = icmp6->icmp6_code;
        }

        M_PREPEND(m, sizeof(*ip6), M_NOWAIT);
        if (m == NULL) {
                error = ENOBUFS;
                goto bad;
        }
        ip6 = mtod(m, struct ip6_hdr *);

        if (V_fib_hash_outbound) {
                hash_val = fib6_calc_software_hash(&inp->in6p_laddr,
                    &dstsock->sin6_addr, 0, 0, inp->inp_ip_p, &hash_type);
                inp->inp_flowid = hash_val;
                inp->inp_flowtype = hash_type;
        }
        /*
         * Source address selection.
         */
        NET_EPOCH_ENTER(et);
        error = in6_selectsrc_socket(dstsock, optp, inp, so->so_cred,
            scope_ambiguous, &in6a, &hlim);
        NET_EPOCH_EXIT(et);

        if (error)
                goto bad;
        error = prison_check_ip6(inp->inp_cred, &in6a);
        if (error != 0)
                goto bad;
        ip6->ip6_src = in6a;

        ip6->ip6_dst = dstsock->sin6_addr;

        /*
         * Fill in the rest of the IPv6 header fields.
         */
        ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
            (inp->inp_flow & IPV6_FLOWINFO_MASK);
        ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
            (IPV6_VERSION & IPV6_VERSION_MASK);

        /*
         * ip6_plen will be filled in ip6_output, so not fill it here.
         */
        ip6->ip6_nxt = inp->inp_ip_p;
        ip6->ip6_hlim = hlim;

        if (inp->inp_ip_p == IPPROTO_ICMPV6 || inp->in6p_cksum != -1) {
                struct mbuf *n;
                int off;
                u_int16_t *p;

                /* Compute checksum. */
                if (inp->inp_ip_p == IPPROTO_ICMPV6)
                        off = offsetof(struct icmp6_hdr, icmp6_cksum);
                else
                        off = inp->in6p_cksum;
                if (plen < off + 2) {
                        error = EINVAL;
                        goto bad;
                }
                off += sizeof(struct ip6_hdr);

                n = m;
                while (n && n->m_len <= off) {
                        off -= n->m_len;
                        n = n->m_next;
                }
                if (!n)
                        goto bad;
                p = (u_int16_t *)(mtod(n, caddr_t) + off);
                *p = 0;
                *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
        }

        /*
         * Send RA/RS messages to user land for protection, before sending
         * them to rtadvd/rtsol.
         */
        if ((send_sendso_input_hook != NULL) &&
            inp->inp_ip_p == IPPROTO_ICMPV6) {
                switch (type) {
                case ND_ROUTER_ADVERT:
                case ND_ROUTER_SOLICIT:
                        mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
                                sizeof(unsigned short), M_NOWAIT);
                        if (mtag == NULL)
                                goto bad;
                        m_tag_prepend(m, mtag);
                }
        }

        NET_EPOCH_ENTER(et);
        error = ip6_output(m, optp, NULL, 0, inp->in6p_moptions, &oifp, inp);
        NET_EPOCH_EXIT(et);
        if (inp->inp_ip_p == IPPROTO_ICMPV6) {
                if (oifp)
                        icmp6_ifoutstat_inc(oifp, type, code);
                ICMP6STAT_INC2(icp6s_outhist, type);
        } else
                RIP6STAT_INC(rip6s_opackets);

        goto freectl;

 bad:
        if (m)
                m_freem(m);

 freectl:
        if (control != NULL) {
                ip6_clearpktopts(&opt, -1);
                m_freem(control);
        }
        INP_WUNLOCK(inp);
        return (error);

release:
        if (control != NULL)
                m_freem(control);
        m_freem(m);
        return (error);
}

/*
 * Raw IPv6 socket option processing.
 */
int
rip6_ctloutput(struct socket *so, struct sockopt *sopt)
{
        struct inpcb *inp = sotoinpcb(so);
        int error;

        if (sopt->sopt_level == IPPROTO_ICMPV6)
                /*
                 * XXX: is it better to call icmp6_ctloutput() directly
                 * from protosw?
                 */
                return (icmp6_ctloutput(so, sopt));
        else if (sopt->sopt_level != IPPROTO_IPV6) {
                if (sopt->sopt_dir == SOPT_SET &&
                    sopt->sopt_level == SOL_SOCKET &&
                    sopt->sopt_name == SO_SETFIB)
                        return (ip6_ctloutput(so, sopt));
                return (EINVAL);
        }

        error = 0;

        switch (sopt->sopt_dir) {
        case SOPT_GET:
                switch (sopt->sopt_name) {
                case MRT6_INIT:
                case MRT6_DONE:
                case MRT6_ADD_MIF:
                case MRT6_DEL_MIF:
                case MRT6_ADD_MFC:
                case MRT6_DEL_MFC:
                case MRT6_PIM:
                        error = priv_check(curthread, PRIV_NETINET_MROUTE);
                        if (error != 0)
                                return (error);
                        if (inp->inp_ip_p != IPPROTO_ICMPV6)
                                return (EOPNOTSUPP);
                        error = ip6_mrouter_get ?  ip6_mrouter_get(so, sopt) :
                            EOPNOTSUPP;
                        break;
                case IPV6_CHECKSUM:
                        error = ip6_raw_ctloutput(so, sopt);
                        break;
                default:
                        error = ip6_ctloutput(so, sopt);
                        break;
                }
                break;

        case SOPT_SET:
                switch (sopt->sopt_name) {
                case MRT6_INIT:
                case MRT6_DONE:
                case MRT6_ADD_MIF:
                case MRT6_DEL_MIF:
                case MRT6_ADD_MFC:
                case MRT6_DEL_MFC:
                case MRT6_PIM:
                        error = priv_check(curthread, PRIV_NETINET_MROUTE);
                        if (error != 0)
                                return (error);
                        if (inp->inp_ip_p != IPPROTO_ICMPV6)
                                return (EOPNOTSUPP);
                        error = ip6_mrouter_set ?  ip6_mrouter_set(so, sopt) :
                            EOPNOTSUPP;
                        break;
                case IPV6_CHECKSUM:
                        error = ip6_raw_ctloutput(so, sopt);
                        break;
                default:
                        error = ip6_ctloutput(so, sopt);
                        break;
                }
                break;
        }

        return (error);
}

static int
rip6_attach(struct socket *so, int proto, struct thread *td)
{
        struct inpcb *inp;
        struct icmp6_filter *filter;
        int error;

        inp = sotoinpcb(so);
        KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));

        error = priv_check(td, PRIV_NETINET_RAW);
        if (error)
                return (error);
        if (proto >= IPPROTO_MAX || proto < 0)
                return (EPROTONOSUPPORT);
        error = soreserve(so, rip_sendspace, rip_recvspace);
        if (error)
                return (error);
        filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
        if (filter == NULL)
                return (ENOMEM);
        error = in_pcballoc(so, &V_ripcbinfo);
        if (error) {
                free(filter, M_PCB);
                return (error);
        }
        inp = (struct inpcb *)so->so_pcb;
        inp->inp_ip_p = proto;
        inp->in6p_cksum = -1;
        inp->in6p_icmp6filt = filter;
        ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
        INP_WUNLOCK(inp);
        return (0);
}

static void
rip6_detach(struct socket *so)
{
        struct inpcb *inp;

        inp = sotoinpcb(so);
        KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));

        if (ip6_mrouter_done != NULL)
                ip6_mrouter_done(so);
        /* xxx: RSVP */
        INP_WLOCK(inp);
        free(inp->in6p_icmp6filt, M_PCB);
        in_pcbfree(inp);
}

/* XXXRW: This can't ever be called. */
static void
rip6_abort(struct socket *so)
{
        struct inpcb *inp __diagused;

        inp = sotoinpcb(so);
        KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));

        soisdisconnected(so);
}

static void
rip6_close(struct socket *so)
{
        struct inpcb *inp __diagused;

        inp = sotoinpcb(so);
        KASSERT(inp != NULL, ("rip6_close: inp == NULL"));

        soisdisconnected(so);
}

static int
rip6_disconnect(struct socket *so)
{
        struct inpcb *inp;

        inp = sotoinpcb(so);
        KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));

        if ((so->so_state & SS_ISCONNECTED) == 0)
                return (ENOTCONN);
        inp->in6p_faddr = in6addr_any;
        rip6_abort(so);
        return (0);
}

static int
rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
{
        struct epoch_tracker et;
        struct inpcb *inp;
        struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
        struct ifaddr *ifa = NULL;
        int error = 0;

        inp = sotoinpcb(so);
        KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));

        if (nam->sa_family != AF_INET6)
                return (EAFNOSUPPORT);
        if (nam->sa_len != sizeof(*addr))
                return (EINVAL);
        if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
                return (error);
        if (CK_STAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
                return (EADDRNOTAVAIL);
        if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
                return (error);

        NET_EPOCH_ENTER(et);
        if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
            (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL) {
                NET_EPOCH_EXIT(et);
                return (EADDRNOTAVAIL);
        }
        if (ifa != NULL &&
            ((struct in6_ifaddr *)ifa)->ia6_flags &
            (IN6_IFF_NOTREADY|IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
                NET_EPOCH_EXIT(et);
                return (EADDRNOTAVAIL);
        }
        NET_EPOCH_EXIT(et);
        INP_WLOCK(inp);
        inp->in6p_laddr = addr->sin6_addr;
        INP_WUNLOCK(inp);
        return (0);
}

static int
rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
{
        struct inpcb *inp;
        struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
        struct in6_addr in6a;
        struct epoch_tracker et;
        int error = 0, scope_ambiguous = 0;

        inp = sotoinpcb(so);
        KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));

        if (nam->sa_len != sizeof(*addr))
                return (EINVAL);
        if (CK_STAILQ_EMPTY(&V_ifnet))
                return (EADDRNOTAVAIL);
        if (addr->sin6_family != AF_INET6)
                return (EAFNOSUPPORT);

        /*
         * Application should provide a proper zone ID or the use of default
         * zone IDs should be enabled.  Unfortunately, some applications do
         * not behave as it should, so we need a workaround.  Even if an
         * appropriate ID is not determined, we'll see if we can determine
         * the outgoing interface.  If we can, determine the zone ID based on
         * the interface below.
         */
        if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
                scope_ambiguous = 1;
        if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
                return (error);

        INP_WLOCK(inp);
        /* Source address selection. XXX: need pcblookup? */
        NET_EPOCH_ENTER(et);
        error = in6_selectsrc_socket(addr, inp->in6p_outputopts,
            inp, so->so_cred, scope_ambiguous, &in6a, NULL);
        NET_EPOCH_EXIT(et);
        if (error) {
                INP_WUNLOCK(inp);
                return (error);
        }

        inp->in6p_faddr = addr->sin6_addr;
        inp->in6p_laddr = in6a;
        soisconnected(so);
        INP_WUNLOCK(inp);
        return (0);
}

static int
rip6_shutdown(struct socket *so, enum shutdown_how how)
{

        SOCK_LOCK(so);
        if (!(so->so_state & SS_ISCONNECTED)) {
                SOCK_UNLOCK(so);
                return (ENOTCONN);
        }
        SOCK_UNLOCK(so);

        switch (how) {
        case SHUT_RD:
                sorflush(so);
                break;
        case SHUT_RDWR:
                sorflush(so);
                /* FALLTHROUGH */
        case SHUT_WR:
                socantsendmore(so);
        }

        return (0);
}

struct protosw rip6_protosw = {
        .pr_type =              SOCK_RAW,
        .pr_flags =             PR_ATOMIC|PR_ADDR,
        .pr_ctloutput =         rip6_ctloutput,
        .pr_abort =             rip6_abort,
        .pr_attach =            rip6_attach,
        .pr_bind =              rip6_bind,
        .pr_connect =           rip6_connect,
        .pr_control =           in6_control,
        .pr_detach =            rip6_detach,
        .pr_disconnect =        rip6_disconnect,
        .pr_peeraddr =          in6_getpeeraddr,
        .pr_send =              rip6_send,
        .pr_shutdown =          rip6_shutdown,
        .pr_sockaddr =          in6_getsockaddr,
        .pr_close =             rip6_close
};