The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/raw_ip6.c

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    1 /*
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: stable/4/sys/netinet6/raw_ip6.c 109792 2003-01-24 05:11:36Z sam $
   30  */
   31 
   32 /*
   33  * Copyright (c) 1982, 1986, 1988, 1993
   34  *      The Regents of the University of California.  All rights reserved.
   35  *
   36  * Redistribution and use in source and binary forms, with or without
   37  * modification, are permitted provided that the following conditions
   38  * are met:
   39  * 1. Redistributions of source code must retain the above copyright
   40  *    notice, this list of conditions and the following disclaimer.
   41  * 2. Redistributions in binary form must reproduce the above copyright
   42  *    notice, this list of conditions and the following disclaimer in the
   43  *    documentation and/or other materials provided with the distribution.
   44  * 3. All advertising materials mentioning features or use of this software
   45  *    must display the following acknowledgement:
   46  *      This product includes software developed by the University of
   47  *      California, Berkeley and its contributors.
   48  * 4. Neither the name of the University nor the names of its contributors
   49  *    may be used to endorse or promote products derived from this software
   50  *    without specific prior written permission.
   51  *
   52  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   53  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   54  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   55  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   56  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   57  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   58  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   59  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   60  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   61  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   62  * SUCH DAMAGE.
   63  *
   64  *      @(#)raw_ip.c    8.2 (Berkeley) 1/4/94
   65  */
   66 
   67 #include "opt_ipsec.h"
   68 #include "opt_inet6.h"
   69 
   70 #include <sys/param.h>
   71 #include <sys/malloc.h>
   72 #include <sys/proc.h>
   73 #include <sys/mbuf.h>
   74 #include <sys/socket.h>
   75 #include <sys/protosw.h>
   76 #include <sys/socketvar.h>
   77 #include <sys/errno.h>
   78 #include <sys/systm.h>
   79 
   80 #include <net/if.h>
   81 #include <net/route.h>
   82 #include <net/if_types.h>
   83 
   84 #include <netinet/in.h>
   85 #include <netinet/in_var.h>
   86 #include <netinet/in_systm.h>
   87 #include <netinet/ip6.h>
   88 #include <netinet6/ip6_var.h>
   89 #include <netinet6/ip6_mroute.h>
   90 #include <netinet/icmp6.h>
   91 #include <netinet/in_pcb.h>
   92 #include <netinet6/in6_pcb.h>
   93 #include <netinet6/nd6.h>
   94 #include <netinet6/ip6protosw.h>
   95 #ifdef ENABLE_DEFAULT_SCOPE
   96 #include <netinet6/scope6_var.h>
   97 #endif
   98 #include <netinet6/raw_ip6.h>
   99 
  100 #ifdef IPSEC
  101 #include <netinet6/ipsec.h>
  102 #include <netinet6/ipsec6.h>
  103 #endif /*IPSEC*/
  104 
  105 #ifdef FAST_IPSEC
  106 #include <netipsec/ipsec.h>
  107 #include <netipsec/ipsec6.h>
  108 #endif /* FAST_IPSEC */
  109 
  110 #include <machine/stdarg.h>
  111 
  112 #define satosin6(sa)    ((struct sockaddr_in6 *)(sa))
  113 #define ifatoia6(ifa)   ((struct in6_ifaddr *)(ifa))
  114 
  115 /*
  116  * Raw interface to IP6 protocol.
  117  */
  118 
  119 extern struct   inpcbhead ripcb;
  120 extern struct   inpcbinfo ripcbinfo;
  121 extern u_long   rip_sendspace;
  122 extern u_long   rip_recvspace;
  123 
  124 struct rip6stat rip6stat;
  125 
  126 /*
  127  * Setup generic address and protocol structures
  128  * for raw_input routine, then pass them along with
  129  * mbuf chain.
  130  */
  131 int
  132 rip6_input(mp, offp, proto)
  133         struct  mbuf **mp;
  134         int     *offp, proto;
  135 {
  136         struct mbuf *m = *mp;
  137         register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  138         register struct inpcb *in6p;
  139         struct inpcb *last = 0;
  140         struct mbuf *opts = NULL;
  141         struct sockaddr_in6 rip6src;
  142 
  143         rip6stat.rip6s_ipackets++;
  144 
  145         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
  146                 /* XXX send icmp6 host/port unreach? */
  147                 m_freem(m);
  148                 return IPPROTO_DONE;
  149         }
  150 
  151         init_sin6(&rip6src, m); /* general init */
  152 
  153         LIST_FOREACH(in6p, &ripcb, inp_list) {
  154                 if ((in6p->in6p_vflag & INP_IPV6) == 0)
  155                         continue;
  156                 if (in6p->in6p_ip6_nxt &&
  157                     in6p->in6p_ip6_nxt != proto)
  158                         continue;
  159                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
  160                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
  161                         continue;
  162                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
  163                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
  164                         continue;
  165                 if (in6p->in6p_cksum != -1) {
  166                         rip6stat.rip6s_isum++;
  167                         if (in6_cksum(m, ip6->ip6_nxt, *offp,
  168                             m->m_pkthdr.len - *offp)) {
  169                                 rip6stat.rip6s_badsum++;
  170                                 continue;
  171                         }
  172                 }
  173                 if (last) {
  174                         struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
  175 
  176 #ifdef IPSEC
  177                         /*
  178                          * Check AH/ESP integrity.
  179                          */
  180                         if (n && ipsec6_in_reject_so(n, last->inp_socket)) {
  181                                 m_freem(n);
  182                                 ipsec6stat.in_polvio++;
  183                                 /* do not inject data into pcb */
  184                         } else
  185 #endif /*IPSEC*/
  186 #ifdef FAST_IPSEC
  187                         /*
  188                          * Check AH/ESP integrity.
  189                          */
  190                         if (n && ipsec6_in_reject(n, last)) {
  191                                 m_freem(n);
  192                                 /* do not inject data into pcb */
  193                         } else
  194 #endif /*FAST_IPSEC*/
  195                         if (n) {
  196                                 if (last->in6p_flags & IN6P_CONTROLOPTS ||
  197                                     last->in6p_socket->so_options & SO_TIMESTAMP)
  198                                         ip6_savecontrol(last, &opts, ip6, n);
  199                                 /* strip intermediate headers */
  200                                 m_adj(n, *offp);
  201                                 if (sbappendaddr(&last->in6p_socket->so_rcv,
  202                                                 (struct sockaddr *)&rip6src,
  203                                                  n, opts) == 0) {
  204                                         m_freem(n);
  205                                         if (opts)
  206                                                 m_freem(opts);
  207                                         rip6stat.rip6s_fullsock++;
  208                                 } else
  209                                         sorwakeup(last->in6p_socket);
  210                                 opts = NULL;
  211                         }
  212                 }
  213                 last = in6p;
  214         }
  215 #ifdef IPSEC
  216         /*
  217          * Check AH/ESP integrity.
  218          */
  219         if (last && ipsec6_in_reject_so(m, last->inp_socket)) {
  220                 m_freem(m);
  221                 ipsec6stat.in_polvio++;
  222                 ip6stat.ip6s_delivered--;
  223                 /* do not inject data into pcb */
  224         } else
  225 #endif /*IPSEC*/
  226 #ifdef FAST_IPSEC
  227         /*
  228          * Check AH/ESP integrity.
  229          */
  230         if (last && ipsec6_in_reject(m, last)) {
  231                 m_freem(m);
  232                 ip6stat.ip6s_delivered--;
  233                 /* do not inject data into pcb */
  234         } else
  235 #endif /*FAST_IPSEC*/
  236         if (last) {
  237                 if (last->in6p_flags & IN6P_CONTROLOPTS ||
  238                     last->in6p_socket->so_options & SO_TIMESTAMP)
  239                         ip6_savecontrol(last, &opts, ip6, m);
  240                 /* strip intermediate headers */
  241                 m_adj(m, *offp);
  242                 if (sbappendaddr(&last->in6p_socket->so_rcv,
  243                                 (struct sockaddr *)&rip6src, m, opts) == 0) {
  244                         m_freem(m);
  245                         if (opts)
  246                                 m_freem(opts);
  247                         rip6stat.rip6s_fullsock++;
  248                 } else
  249                         sorwakeup(last->in6p_socket);
  250         } else {
  251                 rip6stat.rip6s_nosock++;
  252                 if (m->m_flags & M_MCAST)
  253                         rip6stat.rip6s_nosockmcast++;
  254                 if (proto == IPPROTO_NONE)
  255                         m_freem(m);
  256                 else {
  257                         char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
  258                         icmp6_error(m, ICMP6_PARAM_PROB,
  259                                     ICMP6_PARAMPROB_NEXTHEADER,
  260                                     prvnxtp - mtod(m, char *));
  261                 }
  262                 ip6stat.ip6s_delivered--;
  263         }
  264         return IPPROTO_DONE;
  265 }
  266 
  267 void
  268 rip6_ctlinput(cmd, sa, d)
  269         int cmd;
  270         struct sockaddr *sa;
  271         void *d;
  272 {
  273         struct ip6_hdr *ip6;
  274         struct mbuf *m;
  275         int off = 0;
  276         struct ip6ctlparam *ip6cp = NULL;
  277         const struct sockaddr_in6 *sa6_src = NULL;
  278         void (*notify) __P((struct inpcb *, int)) = in6_rtchange;
  279 
  280         if (sa->sa_family != AF_INET6 ||
  281             sa->sa_len != sizeof(struct sockaddr_in6))
  282                 return;
  283 
  284         if ((unsigned)cmd >= PRC_NCMDS)
  285                 return;
  286         if (PRC_IS_REDIRECT(cmd))
  287                 notify = in6_rtchange, d = NULL;
  288         else if (cmd == PRC_HOSTDEAD)
  289                 d = NULL;
  290         else if (inet6ctlerrmap[cmd] == 0)
  291                 return;
  292 
  293         /* if the parameter is from icmp6, decode it. */
  294         if (d != NULL) {
  295                 ip6cp = (struct ip6ctlparam *)d;
  296                 m = ip6cp->ip6c_m;
  297                 ip6 = ip6cp->ip6c_ip6;
  298                 off = ip6cp->ip6c_off;
  299                 sa6_src = ip6cp->ip6c_src;
  300         } else {
  301                 m = NULL;
  302                 ip6 = NULL;
  303                 sa6_src = &sa6_any;
  304         }
  305 
  306         (void) in6_pcbnotify(&ripcb, sa, 0, (struct sockaddr *)sa6_src,
  307                              0, cmd, notify);
  308 }
  309 
  310 /*
  311  * Generate IPv6 header and pass packet to ip6_output.
  312  * Tack on options user may have setup with control call.
  313  */
  314 int
  315 #if __STDC__
  316 rip6_output(struct mbuf *m, ...)
  317 #else
  318 rip6_output(m, va_alist)
  319         struct mbuf *m;
  320         va_dcl
  321 #endif
  322 {
  323         struct socket *so;
  324         struct sockaddr_in6 *dstsock;
  325         struct mbuf *control;
  326         struct in6_addr *dst;
  327         struct ip6_hdr *ip6;
  328         struct inpcb *in6p;
  329         u_int   plen = m->m_pkthdr.len;
  330         int error = 0;
  331         struct ip6_pktopts opt, *optp = 0;
  332         struct ifnet *oifp = NULL;
  333         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
  334         int priv = 0;
  335         va_list ap;
  336 
  337         va_start(ap, m);
  338         so = va_arg(ap, struct socket *);
  339         dstsock = va_arg(ap, struct sockaddr_in6 *);
  340         control = va_arg(ap, struct mbuf *);
  341         va_end(ap);
  342 
  343         in6p = sotoin6pcb(so);
  344 
  345         priv = 0;
  346         if (so->so_cred->cr_uid == 0)
  347                 priv = 1;
  348         dst = &dstsock->sin6_addr;
  349         if (control) {
  350                 if ((error = ip6_setpktoptions(control, &opt, priv, 0)) != 0)
  351                         goto bad;
  352                 optp = &opt;
  353         } else
  354                 optp = in6p->in6p_outputopts;
  355 
  356         /*
  357          * For an ICMPv6 packet, we should know its type and code
  358          * to update statistics.
  359          */
  360         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  361                 struct icmp6_hdr *icmp6;
  362                 if (m->m_len < sizeof(struct icmp6_hdr) &&
  363                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
  364                         error = ENOBUFS;
  365                         goto bad;
  366                 }
  367                 icmp6 = mtod(m, struct icmp6_hdr *);
  368                 type = icmp6->icmp6_type;
  369                 code = icmp6->icmp6_code;
  370         }
  371 
  372         M_PREPEND(m, sizeof(*ip6), M_WAIT);
  373         ip6 = mtod(m, struct ip6_hdr *);
  374 
  375         /*
  376          * Next header might not be ICMP6 but use its pseudo header anyway.
  377          */
  378         ip6->ip6_dst = *dst;
  379 
  380         /*
  381          * If the scope of the destination is link-local, embed the interface
  382          * index in the address.
  383          *
  384          * XXX advanced-api value overrides sin6_scope_id
  385          */
  386         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
  387                 struct in6_pktinfo *pi;
  388 
  389                 /*
  390                  * XXX Boundary check is assumed to be already done in
  391                  * ip6_setpktoptions().
  392                  */
  393                 if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) {
  394                         ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
  395                         oifp = ifindex2ifnet[pi->ipi6_ifindex];
  396                 } else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
  397                          in6p->in6p_moptions &&
  398                          in6p->in6p_moptions->im6o_multicast_ifp) {
  399                         oifp = in6p->in6p_moptions->im6o_multicast_ifp;
  400                         ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
  401                 } else if (dstsock->sin6_scope_id) {
  402                         /* boundary check */
  403                         if (dstsock->sin6_scope_id < 0
  404                          || if_index < dstsock->sin6_scope_id) {
  405                                 error = ENXIO;  /* XXX EINVAL? */
  406                                 goto bad;
  407                         }
  408                         ip6->ip6_dst.s6_addr16[1]
  409                                 = htons(dstsock->sin6_scope_id & 0xffff);/*XXX*/
  410                 }
  411         }
  412 
  413         /*
  414          * Source address selection.
  415          */
  416         {
  417                 struct in6_addr *in6a;
  418 
  419                 if ((in6a = in6_selectsrc(dstsock, optp,
  420                                           in6p->in6p_moptions,
  421                                           &in6p->in6p_route,
  422                                           &in6p->in6p_laddr,
  423                                           &error)) == 0) {
  424                         if (error == 0)
  425                                 error = EADDRNOTAVAIL;
  426                         goto bad;
  427                 }
  428                 ip6->ip6_src = *in6a;
  429                 if (in6p->in6p_route.ro_rt)
  430                         oifp = ifindex2ifnet[in6p->in6p_route.ro_rt->rt_ifp->if_index];
  431         }
  432         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
  433                 (in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK);
  434         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
  435                 (IPV6_VERSION & IPV6_VERSION_MASK);
  436         /* ip6_plen will be filled in ip6_output, so not fill it here. */
  437         ip6->ip6_nxt = in6p->in6p_ip6_nxt;
  438         ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
  439 
  440         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
  441             in6p->in6p_cksum != -1) {
  442                 struct mbuf *n;
  443                 int off;
  444                 u_int16_t *p;
  445 
  446                 /* compute checksum */
  447                 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
  448                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
  449                 else
  450                         off = in6p->in6p_cksum;
  451                 if (plen < off + 1) {
  452                         error = EINVAL;
  453                         goto bad;
  454                 }
  455                 off += sizeof(struct ip6_hdr);
  456 
  457                 n = m;
  458                 while (n && n->m_len <= off) {
  459                         off -= n->m_len;
  460                         n = n->m_next;
  461                 }
  462                 if (!n)
  463                         goto bad;
  464                 p = (u_int16_t *)(mtod(n, caddr_t) + off);
  465                 *p = 0;
  466                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
  467         }
  468 
  469         error = ip6_output(m, optp, &in6p->in6p_route, 0,
  470                            in6p->in6p_moptions, &oifp, in6p);
  471         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  472                 if (oifp)
  473                         icmp6_ifoutstat_inc(oifp, type, code);
  474                 icmp6stat.icp6s_outhist[type]++;
  475         } else
  476                 rip6stat.rip6s_opackets++;
  477 
  478         goto freectl;
  479 
  480  bad:
  481         if (m)
  482                 m_freem(m);
  483 
  484  freectl:
  485         if (optp == &opt && optp->ip6po_rthdr && optp->ip6po_route.ro_rt)
  486                 RTFREE(optp->ip6po_route.ro_rt);
  487         if (control) {
  488                 if (optp == &opt)
  489                         ip6_clearpktopts(optp, 0, -1);
  490                 m_freem(control);
  491         }
  492         return(error);
  493 }
  494 
  495 /*
  496  * Raw IPv6 socket option processing.
  497  */
  498 int
  499 rip6_ctloutput(so, sopt)
  500         struct socket *so;
  501         struct sockopt *sopt;
  502 {
  503         int error;
  504 
  505         if (sopt->sopt_level == IPPROTO_ICMPV6)
  506                 /*
  507                  * XXX: is it better to call icmp6_ctloutput() directly
  508                  * from protosw?
  509                  */
  510                 return(icmp6_ctloutput(so, sopt));
  511         else if (sopt->sopt_level != IPPROTO_IPV6)
  512                 return (EINVAL);
  513 
  514         error = 0;
  515 
  516         switch (sopt->sopt_dir) {
  517         case SOPT_GET:
  518                 switch (sopt->sopt_name) {
  519                 case MRT6_INIT:
  520                 case MRT6_DONE:
  521                 case MRT6_ADD_MIF:
  522                 case MRT6_DEL_MIF:
  523                 case MRT6_ADD_MFC:
  524                 case MRT6_DEL_MFC:
  525                 case MRT6_PIM:
  526                         error = ip6_mrouter_get(so, sopt);
  527                         break;
  528                 default:
  529                         error = ip6_ctloutput(so, sopt);
  530                         break;
  531                 }
  532                 break;
  533 
  534         case SOPT_SET:
  535                 switch (sopt->sopt_name) {
  536                 case MRT6_INIT:
  537                 case MRT6_DONE:
  538                 case MRT6_ADD_MIF:
  539                 case MRT6_DEL_MIF:
  540                 case MRT6_ADD_MFC:
  541                 case MRT6_DEL_MFC:
  542                 case MRT6_PIM:
  543                         error = ip6_mrouter_set(so, sopt);
  544                         break;
  545                 default:
  546                         error = ip6_ctloutput(so, sopt);
  547                         break;
  548                 }
  549                 break;
  550         }
  551 
  552         return (error);
  553 }
  554 
  555 static int
  556 rip6_attach(struct socket *so, int proto, struct proc *p)
  557 {
  558         struct inpcb *inp;
  559         int error, s;
  560 
  561         inp = sotoinpcb(so);
  562         if (inp)
  563                 panic("rip6_attach");
  564         if (p && (error = suser(p)) != 0)
  565                 return error;
  566 
  567         error = soreserve(so, rip_sendspace, rip_recvspace);
  568         if (error)
  569                 return error;
  570         s = splnet();
  571         error = in_pcballoc(so, &ripcbinfo, p);
  572         splx(s);
  573         if (error)
  574                 return error;
  575         inp = (struct inpcb *)so->so_pcb;
  576         inp->inp_vflag |= INP_IPV6;
  577         inp->in6p_ip6_nxt = (long)proto;
  578         inp->in6p_hops = -1;    /* use kernel default */
  579         inp->in6p_cksum = -1;
  580         MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *,
  581                sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
  582         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
  583         return 0;
  584 }
  585 
  586 static int
  587 rip6_detach(struct socket *so)
  588 {
  589         struct inpcb *inp;
  590 
  591         inp = sotoinpcb(so);
  592         if (inp == 0)
  593                 panic("rip6_detach");
  594         /* xxx: RSVP */
  595         if (so == ip6_mrouter)
  596                 ip6_mrouter_done();
  597         if (inp->in6p_icmp6filt) {
  598                 FREE(inp->in6p_icmp6filt, M_PCB);
  599                 inp->in6p_icmp6filt = NULL;
  600         }
  601         in6_pcbdetach(inp);
  602         return 0;
  603 }
  604 
  605 static int
  606 rip6_abort(struct socket *so)
  607 {
  608         soisdisconnected(so);
  609         return rip6_detach(so);
  610 }
  611 
  612 static int
  613 rip6_disconnect(struct socket *so)
  614 {
  615         struct inpcb *inp = sotoinpcb(so);
  616 
  617         if ((so->so_state & SS_ISCONNECTED) == 0)
  618                 return ENOTCONN;
  619         inp->in6p_faddr = in6addr_any;
  620         return rip6_abort(so);
  621 }
  622 
  623 static int
  624 rip6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
  625 {
  626         struct inpcb *inp = sotoinpcb(so);
  627         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  628         struct ifaddr *ia = NULL;
  629 
  630         if (nam->sa_len != sizeof(*addr))
  631                 return EINVAL;
  632 
  633         if (TAILQ_EMPTY(&ifnet) || addr->sin6_family != AF_INET6)
  634                 return EADDRNOTAVAIL;
  635 #ifdef ENABLE_DEFAULT_SCOPE
  636         if (addr->sin6_scope_id == 0) { /* not change if specified  */
  637                 addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
  638         }
  639 #endif
  640         if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
  641             (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0)
  642                 return EADDRNOTAVAIL;
  643         if (ia &&
  644             ((struct in6_ifaddr *)ia)->ia6_flags &
  645             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
  646              IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
  647                 return(EADDRNOTAVAIL);
  648         }
  649         inp->in6p_laddr = addr->sin6_addr;
  650         return 0;
  651 }
  652 
  653 static int
  654 rip6_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
  655 {
  656         struct inpcb *inp = sotoinpcb(so);
  657         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  658         struct in6_addr *in6a = NULL;
  659         int error = 0;
  660 #ifdef ENABLE_DEFAULT_SCOPE
  661         struct sockaddr_in6 tmp;
  662 #endif
  663 
  664         if (nam->sa_len != sizeof(*addr))
  665                 return EINVAL;
  666         if (TAILQ_EMPTY(&ifnet))
  667                 return EADDRNOTAVAIL;
  668         if (addr->sin6_family != AF_INET6)
  669                 return EAFNOSUPPORT;
  670 #ifdef ENABLE_DEFAULT_SCOPE
  671         if (addr->sin6_scope_id == 0) { /* not change if specified  */
  672                 /* avoid overwrites */
  673                 tmp = *addr;
  674                 addr = &tmp;
  675                 addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
  676         }
  677 #endif
  678         /* Source address selection. XXX: need pcblookup? */
  679         in6a = in6_selectsrc(addr, inp->in6p_outputopts,
  680                              inp->in6p_moptions, &inp->in6p_route,
  681                              &inp->in6p_laddr, &error);
  682         if (in6a == NULL)
  683                 return (error ? error : EADDRNOTAVAIL);
  684         inp->in6p_laddr = *in6a;
  685         inp->in6p_faddr = addr->sin6_addr;
  686         soisconnected(so);
  687         return 0;
  688 }
  689 
  690 static int
  691 rip6_shutdown(struct socket *so)
  692 {
  693         socantsendmore(so);
  694         return 0;
  695 }
  696 
  697 static int
  698 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  699          struct mbuf *control, struct proc *p)
  700 {
  701         struct inpcb *inp = sotoinpcb(so);
  702         struct sockaddr_in6 tmp;
  703         struct sockaddr_in6 *dst;
  704 
  705         /* always copy sockaddr to avoid overwrites */
  706         if (so->so_state & SS_ISCONNECTED) {
  707                 if (nam) {
  708                         m_freem(m);
  709                         return EISCONN;
  710                 }
  711                 /* XXX */
  712                 bzero(&tmp, sizeof(tmp));
  713                 tmp.sin6_family = AF_INET6;
  714                 tmp.sin6_len = sizeof(struct sockaddr_in6);
  715                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
  716                       sizeof(struct in6_addr));
  717                 dst = &tmp;
  718         } else {
  719                 if (nam == NULL) {
  720                         m_freem(m);
  721                         return ENOTCONN;
  722                 }
  723                 tmp = *(struct sockaddr_in6 *)nam;
  724                 dst = &tmp;
  725         }
  726 #ifdef ENABLE_DEFAULT_SCOPE
  727         if (dst->sin6_scope_id == 0) {  /* not change if specified  */
  728                 dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr);
  729         }
  730 #endif
  731         return rip6_output(m, so, dst, control);
  732 }
  733 
  734 struct pr_usrreqs rip6_usrreqs = {
  735         rip6_abort, pru_accept_notsupp, rip6_attach, rip6_bind, rip6_connect,
  736         pru_connect2_notsupp, in6_control, rip6_detach, rip6_disconnect,
  737         pru_listen_notsupp, in6_setpeeraddr, pru_rcvd_notsupp,
  738         pru_rcvoob_notsupp, rip6_send, pru_sense_null, rip6_shutdown,
  739         in6_setsockaddr, sosend, soreceive, sopoll
  740 };

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