/*      $OpenBSD: raw_ip6.c,v 1.194 2025/07/08 00:47:41 jsg Exp $       */
/*      $KAME: raw_ip6.c,v 1.69 2001/03/04 15:55:44 itojun Exp $        */

/*
 * 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.
 *
 *      @(#)raw_ip.c    8.2 (Berkeley) 1/4/94
 */

#include "pf.h"

#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/errno.h>
#include <sys/systm.h>
#include <sys/sysctl.h>

#include <net/if.h>
#include <net/if_var.h>

#include <netinet/in.h>
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#ifdef MROUTING
#include <netinet6/ip6_mroute.h>
#endif
#include <netinet/icmp6.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet6/ip6protosw.h>
#include <netinet6/raw_ip6.h>

#if NPF > 0
#include <net/pfvar.h>
#endif

/*
 * Raw interface to IP6 protocol.
 */

struct  inpcbtable rawin6pcbtable;

struct cpumem *rip6counters;

const struct pr_usrreqs rip6_usrreqs = {
        .pru_attach     = rip6_attach,
        .pru_detach     = rip6_detach,
        .pru_bind       = rip6_bind,
        .pru_connect    = rip6_connect,
        .pru_disconnect = rip6_disconnect,
        .pru_shutdown   = rip6_shutdown,
        .pru_send       = rip6_send,
        .pru_control    = in6_control,
        .pru_sockaddr   = in6_sockaddr,
        .pru_peeraddr   = in6_peeraddr,
};

void    rip6_sbappend(struct inpcb *, struct mbuf *, struct ip6_hdr *, int,
            struct sockaddr_in6 *);

/*
 * Initialize raw connection block queue.
 */
void
rip6_init(void)
{
        in_pcbinit(&rawin6pcbtable, 1);
        rip6counters = counters_alloc(rip6s_ncounters);
}

int
rip6_input(struct mbuf **mp, int *offp, int proto, int af, struct netstack *ns)
{
        struct mbuf *m = *mp;
        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
        struct inpcb_iterator iter = { .inp_table = NULL };
        struct inpcb *inp, *last;
        struct in6_addr *key;
        struct sockaddr_in6 rip6src;
        uint8_t type;

        KASSERT(af == AF_INET6);

        if (proto == IPPROTO_ICMPV6) {
                struct icmp6_hdr *icmp6;

                icmp6 = ip6_exthdr_get(mp, *offp, sizeof(*icmp6));
                if (icmp6 == NULL)
                        return IPPROTO_DONE;
                type = icmp6->icmp6_type;
        } else
                rip6stat_inc(rip6s_ipackets);

        memset(&rip6src, 0, sizeof(rip6src));
        rip6src.sin6_family = AF_INET6;
        rip6src.sin6_len = sizeof(rip6src);
        /* KAME hack: recover scopeid */
        in6_recoverscope(&rip6src, &ip6->ip6_src);

        key = &ip6->ip6_dst;
#if NPF > 0
        if (m->m_pkthdr.pf.flags & PF_TAG_DIVERTED) {
                struct pf_divert *divert;

                divert = pf_find_divert(m);
                KASSERT(divert != NULL);
                switch (divert->type) {
                case PF_DIVERT_TO:
                        key = &divert->addr.v6;
                        break;
                case PF_DIVERT_REPLY:
                        break;
                default:
                        panic("%s: unknown divert type %d, mbuf %p, divert %p",
                            __func__, divert->type, m, divert);
                }
        }
#endif
        mtx_enter(&rawin6pcbtable.inpt_mtx);
        last = inp = NULL;
        while ((inp = in_pcb_iterator(&rawin6pcbtable, inp, &iter)) != NULL) {
                KASSERT(ISSET(inp->inp_flags, INP_IPV6));

                /*
                 * Packet must not be inserted after disconnected wakeup
                 * call.  To avoid race, check again when holding receive
                 * buffer mutex.
                 */
                if (ISSET(READ_ONCE(inp->inp_socket->so_rcv.sb_state),
                    SS_CANTRCVMORE))
                        continue;
                if (rtable_l2(inp->inp_rtableid) !=
                    rtable_l2(m->m_pkthdr.ph_rtableid))
                        continue;

                if ((inp->inp_ipv6.ip6_nxt || proto == IPPROTO_ICMPV6) &&
                    inp->inp_ipv6.ip6_nxt != proto)
                        continue;
                if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) &&
                    !IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, key))
                        continue;
                if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6) &&
                    !IN6_ARE_ADDR_EQUAL(&inp->inp_faddr6, &ip6->ip6_src))
                        continue;
                if (proto == IPPROTO_ICMPV6 && inp->inp_icmp6filt) {
                        if (ICMP6_FILTER_WILLBLOCK(type, inp->inp_icmp6filt))
                                continue;
                }
                if (proto != IPPROTO_ICMPV6 && inp->inp_cksum6 != -1) {
                        rip6stat_inc(rip6s_isum);
                        /*
                         * Although in6_cksum() does not need the position of
                         * the checksum field for verification, enforce that it
                         * is located within the packet.  Userland has given
                         * a checksum offset, a packet too short for that is
                         * invalid.  Avoid overflow with user supplied offset.
                         */
                        if (m->m_pkthdr.len < *offp + 2 ||
                            m->m_pkthdr.len - *offp - 2 < inp->inp_cksum6 ||
                            in6_cksum(m, proto, *offp,
                            m->m_pkthdr.len - *offp)) {
                                rip6stat_inc(rip6s_badsum);
                                continue;
                        }
                }

                if (last != NULL) {
                        struct mbuf *n;

                        mtx_leave(&rawin6pcbtable.inpt_mtx);

                        n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
                        if (n != NULL)
                                rip6_sbappend(last, n, ip6, *offp, &rip6src);
                        in_pcbunref(last);

                        mtx_enter(&rawin6pcbtable.inpt_mtx);
                }
                last = in_pcbref(inp);
        }
        mtx_leave(&rawin6pcbtable.inpt_mtx);

        if (last == NULL) {
                struct counters_ref ref;
                uint64_t *counters;

                if (proto != IPPROTO_ICMPV6) {
                        rip6stat_inc(rip6s_nosock);
                        if (m->m_flags & M_MCAST)
                                rip6stat_inc(rip6s_nosockmcast);
                }
                if (proto == IPPROTO_NONE || proto == IPPROTO_ICMPV6) {
                        m_freem(m);
                } else {
                        int prvnxt = ip6_get_prevhdr(m, *offp);

                        icmp6_error(m, ICMP6_PARAM_PROB,
                            ICMP6_PARAMPROB_NEXTHEADER, prvnxt);
                }
                counters = counters_enter(&ref, ip6counters);
                counters[ip6s_delivered]--;
                counters_leave(&ref, ip6counters);

                return IPPROTO_DONE;
        }

        rip6_sbappend(last, m, ip6, *offp, &rip6src);
        in_pcbunref(last);

        return IPPROTO_DONE;
}

void
rip6_sbappend(struct inpcb *inp, struct mbuf *m, struct ip6_hdr *ip6, int hlen,
    struct sockaddr_in6 *rip6src)
{
        struct socket *so = inp->inp_socket;
        struct mbuf *opts = NULL;
        int ret = 0;

        if (inp->inp_flags & IN6P_CONTROLOPTS)
                ip6_savecontrol(inp, m, &opts);
        /* strip intermediate headers */
        m_adj(m, hlen);

        mtx_enter(&so->so_rcv.sb_mtx);
        if (!ISSET(inp->inp_socket->so_rcv.sb_state, SS_CANTRCVMORE))
                ret = sbappendaddr(&so->so_rcv, sin6tosa(rip6src), m, opts);
        mtx_leave(&so->so_rcv.sb_mtx);

        if (ret == 0) {
                m_freem(m);
                m_freem(opts);
                rip6stat_inc(rip6s_fullsock);
        } else
                sorwakeup(so);
}

void
rip6_ctlinput(int cmd, struct sockaddr *sa, u_int rdomain, void *d)
{
        struct ip6_hdr *ip6;
        struct ip6ctlparam *ip6cp = NULL;
        struct sockaddr_in6 *sa6 = satosin6(sa);
        const struct sockaddr_in6 *sa6_src = NULL;
        void *cmdarg;
        void (*notify)(struct inpcb *, int) = in_pcbrtchange;
        int nxt;

        if (sa->sa_family != AF_INET6 ||
            sa->sa_len != sizeof(struct sockaddr_in6))
                return;

        if ((unsigned)cmd >= PRC_NCMDS)
                return;
        if (PRC_IS_REDIRECT(cmd))
                notify = in_pcbrtchange, d = NULL;
        else if (cmd == PRC_HOSTDEAD)
                d = NULL;
        else if (cmd == PRC_MSGSIZE)
                ; /* special code is present, see below */
        else if (inet6ctlerrmap[cmd] == 0)
                return;

        /* if the parameter is from icmp6, decode it. */
        if (d != NULL) {
                ip6cp = (struct ip6ctlparam *)d;
                ip6 = ip6cp->ip6c_ip6;
                cmdarg = ip6cp->ip6c_cmdarg;
                sa6_src = ip6cp->ip6c_src;
                nxt = ip6cp->ip6c_nxt;
        } else {
                ip6 = NULL;
                cmdarg = NULL;
                sa6_src = &sa6_any;
                nxt = -1;
        }

        if (ip6 && cmd == PRC_MSGSIZE) {
                int valid = 0;
                struct inpcb *inp;

                /*
                 * Check to see if we have a valid raw IPv6 socket
                 * corresponding to the address in the ICMPv6 message
                 * payload, and the protocol (ip6_nxt) meets the socket.
                 * XXX chase extension headers, or pass final nxt value
                 * from icmp6_notify_error()
                 */
                inp = in6_pcblookup(&rawin6pcbtable, &sa6->sin6_addr, 0,
                    &sa6_src->sin6_addr, 0, rdomain);

                if (inp && inp->inp_ipv6.ip6_nxt &&
                    inp->inp_ipv6.ip6_nxt == nxt)
                        valid = 1;

                /*
                 * Depending on the value of "valid" and routing table
                 * size (mtudisc_{hi,lo}wat), we will:
                 * - recalculate the new MTU and create the
                 *   corresponding routing entry, or
                 * - ignore the MTU change notification.
                 */
                icmp6_mtudisc_update((struct ip6ctlparam *)d, valid);
                in_pcbunref(inp);

                /*
                 * regardless of if we called icmp6_mtudisc_update(),
                 * we need to call in6_pcbnotify(), to notify path
                 * MTU change to the userland (2292bis-02), because
                 * some unconnected sockets may share the same
                 * destination and want to know the path MTU.
                 */
        }

        in6_pcbnotify(&rawin6pcbtable, sa6, 0,
            sa6_src, 0, rdomain, cmd, cmdarg, notify);
}

/*
 * Generate IPv6 header and pass packet to ip6_output.
 * Tack on options user may have setup with control call.
 */
int
rip6_output(struct mbuf *m, struct socket *so, struct sockaddr *dstaddr,
    struct mbuf *control)
{
        struct in6_addr *dst;
        struct ip6_hdr *ip6;
        struct inpcb *inp;
        u_int   plen = m->m_pkthdr.len;
        int error = 0;
        struct ip6_pktopts opt, *optp = NULL;
        int type;               /* for ICMPv6 output statistics only */
        int priv = 0;
        int flags;

        inp = sotoinpcb(so);

        priv = 0;
        if ((so->so_state & SS_PRIV) != 0)
                priv = 1;
        if (control) {
                if ((error = ip6_setpktopts(control, &opt,
                    inp->inp_outputopts6,
                    priv, so->so_proto->pr_protocol)) != 0)
                        goto bad;
                optp = &opt;
        } else
                optp = inp->inp_outputopts6;

        if (dstaddr->sa_family != AF_INET6) {
                error = EAFNOSUPPORT;
                goto bad;
        }
        dst = &satosin6(dstaddr)->sin6_addr;
        if (IN6_IS_ADDR_V4MAPPED(dst)) {
                error = EADDRNOTAVAIL;
                goto bad;
        }

        /*
         * For an ICMPv6 packet, we should know its type and code
         * to update statistics.
         */
        if (so->so_proto->pr_protocol == 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;
        }

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

        /*
         * Next header might not be ICMP6 but use its pseudo header anyway.
         */
        ip6->ip6_dst = *dst;

        /* KAME hack: embed scopeid */
        if (in6_embedscope(&ip6->ip6_dst, satosin6(dstaddr),
            optp, inp->inp_moptions6) != 0) {
                error = EINVAL;
                goto bad;
        }

        /*
         * Source address selection.
         */
        {
                const struct in6_addr *in6a;

                error = in6_pcbselsrc(&in6a, satosin6(dstaddr), inp, optp);
                if (error)
                        goto bad;

                ip6->ip6_src = *in6a;
        }

        ip6->ip6_flow = inp->inp_flowinfo & IPV6_FLOWINFO_MASK;
        ip6->ip6_vfc  &= ~IPV6_VERSION_MASK;
        ip6->ip6_vfc  |= IPV6_VERSION;
#if 0                           /* ip6_plen will be filled in ip6_output. */
        ip6->ip6_plen  = htons((u_short)plen);
#endif
        ip6->ip6_nxt   = inp->inp_ipv6.ip6_nxt;
        ip6->ip6_hlim = in6_selecthlim(inp);

        if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
            inp->inp_cksum6 != -1) {
                struct mbuf *n;
                int off;
                u_int16_t *sump;
                int sumoff;

                /* compute checksum */
                if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
                        off = offsetof(struct icmp6_hdr, icmp6_cksum);
                else
                        off = inp->inp_cksum6;
                if (plen < 2 || plen - 2 < off) {
                        error = EINVAL;
                        goto bad;
                }
                off += sizeof(struct ip6_hdr);

                n = m_pulldown(m, off, sizeof(*sump), &sumoff);
                if (n == NULL) {
                        m = NULL;
                        error = ENOBUFS;
                        goto bad;
                }
                sump = (u_int16_t *)(mtod(n, caddr_t) + sumoff);
                *sump = 0;
                *sump = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
        }

        flags = 0;
        if (inp->inp_flags & IN6P_MINMTU)
                flags |= IPV6_MINMTU;

        /* force routing table */
        m->m_pkthdr.ph_rtableid = inp->inp_rtableid;

#if NPF > 0
        if (inp->inp_socket->so_state & SS_ISCONNECTED &&
            so->so_proto->pr_protocol != IPPROTO_ICMPV6)
                pf_mbuf_link_inpcb(m, inp);
#endif

        error = ip6_output(m, optp, &inp->inp_route, flags,
            inp->inp_moptions6, &inp->inp_seclevel);
        if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
                icmp6stat_inc(icp6s_outhist + type);
        } else
                rip6stat_inc(rip6s_opackets);

        goto freectl;

 bad:
        m_freem(m);

 freectl:
        if (control) {
                ip6_clearpktopts(&opt, -1);
                m_freem(control);
        }
        return (error);
}

/*
 * Raw IPv6 socket option processing.
 */
int
rip6_ctloutput(int op, struct socket *so, int level, int optname,
    struct mbuf *m)
{
#ifdef MROUTING
        int error;
#endif

        switch (level) {
        case IPPROTO_IPV6:
                switch (optname) {
#ifdef MROUTING
                case MRT6_INIT:
                case MRT6_DONE:
                case MRT6_ADD_MIF:
                case MRT6_DEL_MIF:
                case MRT6_ADD_MFC:
                case MRT6_DEL_MFC:
                        if (op == PRCO_SETOPT) {
                                error = ip6_mrouter_set(optname, so, m);
                        } else if (op == PRCO_GETOPT)
                                error = ip6_mrouter_get(optname, so, m);
                        else
                                error = EINVAL;
                        return (error);
#endif
                case IPV6_CHECKSUM:
                        return (ip6_raw_ctloutput(op, so, level, optname, m));
                default:
                        return (ip6_ctloutput(op, so, level, optname, m));
                }

        case IPPROTO_ICMPV6:
                /*
                 * XXX: is it better to call icmp6_ctloutput() directly
                 * from protosw?
                 */
                return (icmp6_ctloutput(op, so, level, optname, m));

        default:
                return EINVAL;
        }
}

extern  u_long rip6_sendspace;
extern  u_long rip6_recvspace;

int
rip6_attach(struct socket *so, int proto, int wait)
{
        struct inpcb *inp;
        int error;

        if (so->so_pcb)
                panic("%s", __func__);
        if ((so->so_state & SS_PRIV) == 0)
                return (EACCES);
        if (proto < 0 || proto >= IPPROTO_MAX)
                return EPROTONOSUPPORT;

        if ((error = soreserve(so, rip6_sendspace, rip6_recvspace)))
                return error;
        if ((error = in_pcballoc(so, &rawin6pcbtable, wait)))
                return error;

        inp = sotoinpcb(so);
        inp->inp_ipv6.ip6_nxt = proto;
        inp->inp_cksum6 = -1;

        inp->inp_icmp6filt = malloc(sizeof(struct icmp6_filter), M_PCB,
            wait == M_WAIT ? M_WAITOK : M_NOWAIT);
        if (inp->inp_icmp6filt == NULL) {
                in_pcbdetach(inp);
                return ENOMEM;
        }
        ICMP6_FILTER_SETPASSALL(inp->inp_icmp6filt);
        return 0;
}

int
rip6_detach(struct socket *so)
{
        struct inpcb *inp = sotoinpcb(so);

        soassertlocked(so);

        if (inp == NULL)
                panic("%s", __func__);
#ifdef MROUTING
        if (so == ip6_mrouter[inp->inp_rtableid])
                ip6_mrouter_done(so);
#endif
        free(inp->inp_icmp6filt, M_PCB, sizeof(struct icmp6_filter));
        inp->inp_icmp6filt = NULL;

        in_pcbdetach(inp);

        return (0);
}

int
rip6_bind(struct socket *so, struct mbuf *nam, struct proc *p)
{
        struct inpcb *inp = sotoinpcb(so);
        struct sockaddr_in6 *addr;
        int error;

        soassertlocked(so);

        if ((error = in6_nam2sin6(nam, &addr)))
                return (error);

        /*
         * Make sure to not enter in_pcblookup_local(), local ports
         * are non-sensical for raw sockets.
         */
        addr->sin6_port = 0;

        if ((error = in6_pcbaddrisavail(inp, addr, 0, p)))
                return (error);

        mtx_enter(&rawin6pcbtable.inpt_mtx);
        inp->inp_laddr6 = addr->sin6_addr;
        mtx_leave(&rawin6pcbtable.inpt_mtx);

        return (0);
}

int
rip6_connect(struct socket *so, struct mbuf *nam)
{
        struct inpcb *inp = sotoinpcb(so);
        struct sockaddr_in6 *addr;
        const struct in6_addr *in6a;
        int error;

        soassertlocked(so);

        if ((error = in6_nam2sin6(nam, &addr)))
                return (error);

        /* Source address selection. XXX: need pcblookup? */
        error = in6_pcbselsrc(&in6a, addr, inp, inp->inp_outputopts6);
        if (error)
                return (error);

        mtx_enter(&rawin6pcbtable.inpt_mtx);
        inp->inp_laddr6 = *in6a;
        inp->inp_faddr6 = addr->sin6_addr;
        mtx_leave(&rawin6pcbtable.inpt_mtx);
        soisconnected(so);

        return (0);
}

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

        soassertlocked(so);

        if ((so->so_state & SS_ISCONNECTED) == 0)
                return (ENOTCONN);

        soisdisconnected(so);
        mtx_enter(&rawin6pcbtable.inpt_mtx);
        inp->inp_faddr6 = in6addr_any;
        mtx_leave(&rawin6pcbtable.inpt_mtx);

        return (0);
}

int
rip6_shutdown(struct socket *so)
{
        /*
         * Mark the connection as being incapable of further input.
         */
        soassertlocked(so);
        socantsendmore(so);
        return (0);
}

int
rip6_send(struct socket *so, struct mbuf *m, struct mbuf *nam,
        struct mbuf *control)
{
        struct inpcb *inp = sotoinpcb(so);
        struct sockaddr_in6 dst;
        int error;

        soassertlocked(so);

        /*
         * Ship a packet out. The appropriate raw output
         * routine handles any messaging necessary.
         */

        /* always copy sockaddr to avoid overwrites */
        memset(&dst, 0, sizeof(dst));
        dst.sin6_family = AF_INET6;
        dst.sin6_len = sizeof(dst);
        if (so->so_state & SS_ISCONNECTED) {
                if (nam) {
                        error = EISCONN;
                        goto out;
                }
                dst.sin6_addr = inp->inp_faddr6;
        } else {
                struct sockaddr_in6 *addr6;

                if (nam == NULL) {
                        error = ENOTCONN;
                        goto out;
                }
                if ((error = in6_nam2sin6(nam, &addr6)))
                        goto out;
                dst.sin6_addr = addr6->sin6_addr;
                dst.sin6_scope_id = addr6->sin6_scope_id;
        }
        error = rip6_output(m, so, sin6tosa(&dst), control);
        control = NULL;
        m = NULL;

out:
        m_freem(control);
        m_freem(m);

        return (error);
}

#ifndef SMALL_KERNEL
int
rip6_sysctl_rip6stat(void *oldp, size_t *oldplen, void *newp)
{
        struct rip6stat rip6stat;

        CTASSERT(sizeof(rip6stat) == rip6s_ncounters * sizeof(uint64_t));
        counters_read(rip6counters, (uint64_t *)&rip6stat, rip6s_ncounters,
            NULL);

        return (sysctl_rdstruct(oldp, oldplen, newp,
            &rip6stat, sizeof(rip6stat)));
}

int
rip6_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
    void *newp, size_t newlen)
{
        /* All sysctl names at this level are terminal. */
        if (namelen != 1)
                return ENOTDIR;

        switch (name[0]) {
        case RIPV6CTL_STATS:
                return (rip6_sysctl_rip6stat(oldp, oldlenp, newp));
        default:
                return (EOPNOTSUPP);
        }
        /* NOTREACHED */
}
#endif /* SMALL_KERNEL */