The Design and Implementation of the FreeBSD Operating System, Second Edition
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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: src/sys/netinet6/raw_ip6.c,v 1.23 2002/10/16 02:25:05 sam Exp $
   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/errno.h>
   72 #include <sys/lock.h>
   73 #include <sys/malloc.h>
   74 #include <sys/mbuf.h>
   75 #include <sys/proc.h>
   76 #include <sys/protosw.h>
   77 #include <sys/signalvar.h>
   78 #include <sys/socket.h>
   79 #include <sys/socketvar.h>
   80 #include <sys/sx.h>
   81 #include <sys/systm.h>
   82 
   83 #include <net/if.h>
   84 #include <net/if_types.h>
   85 #include <net/route.h>
   86 
   87 #include <netinet/in.h>
   88 #include <netinet/in_var.h>
   89 #include <netinet/in_systm.h>
   90 #include <netinet/icmp6.h>
   91 #include <netinet/in_pcb.h>
   92 #include <netinet/ip6.h>
   93 #include <netinet6/ip6protosw.h>
   94 #include <netinet6/ip6_mroute.h>
   95 #include <netinet6/in6_pcb.h>
   96 #include <netinet6/ip6_var.h>
   97 #include <netinet6/nd6.h>
   98 #include <netinet6/raw_ip6.h>
   99 #ifdef ENABLE_DEFAULT_SCOPE
  100 #include <netinet6/scope6_var.h>
  101 #endif
  102 
  103 #ifdef IPSEC
  104 #include <netinet6/ipsec.h>
  105 #include <netinet6/ipsec6.h>
  106 #endif /*IPSEC*/
  107 
  108 #ifdef FAST_IPSEC
  109 #include <netipsec/ipsec.h>
  110 #include <netipsec/ipsec6.h>
  111 #endif /* FAST_IPSEC */
  112 
  113 #include <machine/stdarg.h>
  114 
  115 #define satosin6(sa)    ((struct sockaddr_in6 *)(sa))
  116 #define ifatoia6(ifa)   ((struct in6_ifaddr *)(ifa))
  117 
  118 /*
  119  * Raw interface to IP6 protocol.
  120  */
  121 
  122 extern struct   inpcbhead ripcb;
  123 extern struct   inpcbinfo ripcbinfo;
  124 extern u_long   rip_sendspace;
  125 extern u_long   rip_recvspace;
  126 
  127 struct rip6stat rip6stat;
  128 
  129 /*
  130  * Setup generic address and protocol structures
  131  * for raw_input routine, then pass them along with
  132  * mbuf chain.
  133  */
  134 int
  135 rip6_input(mp, offp, proto)
  136         struct  mbuf **mp;
  137         int     *offp, proto;
  138 {
  139         struct mbuf *m = *mp;
  140         register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  141         register struct inpcb *in6p;
  142         struct inpcb *last = 0;
  143         struct mbuf *opts = NULL;
  144         struct sockaddr_in6 rip6src;
  145 
  146         rip6stat.rip6s_ipackets++;
  147 
  148         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
  149                 /* XXX send icmp6 host/port unreach? */
  150                 m_freem(m);
  151                 return IPPROTO_DONE;
  152         }
  153 
  154         init_sin6(&rip6src, m); /* general init */
  155 
  156         LIST_FOREACH(in6p, &ripcb, inp_list) {
  157                 if ((in6p->in6p_vflag & INP_IPV6) == 0)
  158                         continue;
  159                 if (in6p->in6p_ip6_nxt &&
  160                     in6p->in6p_ip6_nxt != proto)
  161                         continue;
  162                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
  163                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
  164                         continue;
  165                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
  166                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
  167                         continue;
  168                 if (in6p->in6p_cksum != -1) {
  169                         rip6stat.rip6s_isum++;
  170                         if (in6_cksum(m, ip6->ip6_nxt, *offp,
  171                             m->m_pkthdr.len - *offp)) {
  172                                 rip6stat.rip6s_badsum++;
  173                                 continue;
  174                         }
  175                 }
  176                 if (last) {
  177                         struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
  178 
  179 #ifdef IPSEC
  180                         /*
  181                          * Check AH/ESP integrity.
  182                          */
  183                         if (n && ipsec6_in_reject_so(n, last->inp_socket)) {
  184                                 m_freem(n);
  185                                 ipsec6stat.in_polvio++;
  186                                 /* do not inject data into pcb */
  187                         } else
  188 #endif /*IPSEC*/
  189 #ifdef FAST_IPSEC
  190                         /*
  191                          * Check AH/ESP integrity.
  192                          */
  193                         if (n && ipsec6_in_reject(n, last)) {
  194                                 m_freem(n);
  195                                 /* do not inject data into pcb */
  196                         } else
  197 #endif /*FAST_IPSEC*/
  198                         if (n) {
  199                                 if (last->in6p_flags & IN6P_CONTROLOPTS ||
  200                                     last->in6p_socket->so_options & SO_TIMESTAMP)
  201                                         ip6_savecontrol(last, &opts, ip6, n);
  202                                 /* strip intermediate headers */
  203                                 m_adj(n, *offp);
  204                                 if (sbappendaddr(&last->in6p_socket->so_rcv,
  205                                                 (struct sockaddr *)&rip6src,
  206                                                  n, opts) == 0) {
  207                                         m_freem(n);
  208                                         if (opts)
  209                                                 m_freem(opts);
  210                                         rip6stat.rip6s_fullsock++;
  211                                 } else
  212                                         sorwakeup(last->in6p_socket);
  213                                 opts = NULL;
  214                         }
  215                 }
  216                 last = in6p;
  217         }
  218 #ifdef IPSEC
  219         /*
  220          * Check AH/ESP integrity.
  221          */
  222         if (last && ipsec6_in_reject_so(m, last->inp_socket)) {
  223                 m_freem(m);
  224                 ipsec6stat.in_polvio++;
  225                 ip6stat.ip6s_delivered--;
  226                 /* do not inject data into pcb */
  227         } else
  228 #endif /*IPSEC*/
  229 #ifdef FAST_IPSEC
  230         /*
  231          * Check AH/ESP integrity.
  232          */
  233         if (last && ipsec6_in_reject(m, last)) {
  234                 m_freem(m);
  235                 ip6stat.ip6s_delivered--;
  236                 /* do not inject data into pcb */
  237         } else
  238 #endif /*FAST_IPSEC*/
  239         if (last) {
  240                 if (last->in6p_flags & IN6P_CONTROLOPTS ||
  241                     last->in6p_socket->so_options & SO_TIMESTAMP)
  242                         ip6_savecontrol(last, &opts, ip6, m);
  243                 /* strip intermediate headers */
  244                 m_adj(m, *offp);
  245                 if (sbappendaddr(&last->in6p_socket->so_rcv,
  246                                 (struct sockaddr *)&rip6src, m, opts) == 0) {
  247                         m_freem(m);
  248                         if (opts)
  249                                 m_freem(opts);
  250                         rip6stat.rip6s_fullsock++;
  251                 } else
  252                         sorwakeup(last->in6p_socket);
  253         } else {
  254                 rip6stat.rip6s_nosock++;
  255                 if (m->m_flags & M_MCAST)
  256                         rip6stat.rip6s_nosockmcast++;
  257                 if (proto == IPPROTO_NONE)
  258                         m_freem(m);
  259                 else {
  260                         char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
  261                         icmp6_error(m, ICMP6_PARAM_PROB,
  262                                     ICMP6_PARAMPROB_NEXTHEADER,
  263                                     prvnxtp - mtod(m, char *));
  264                 }
  265                 ip6stat.ip6s_delivered--;
  266         }
  267         return IPPROTO_DONE;
  268 }
  269 
  270 void
  271 rip6_ctlinput(cmd, sa, d)
  272         int cmd;
  273         struct sockaddr *sa;
  274         void *d;
  275 {
  276         struct ip6_hdr *ip6;
  277         struct mbuf *m;
  278         int off = 0;
  279         struct ip6ctlparam *ip6cp = NULL;
  280         const struct sockaddr_in6 *sa6_src = NULL;
  281         struct inpcb *(*notify) __P((struct inpcb *, int)) = in6_rtchange;
  282 
  283         if (sa->sa_family != AF_INET6 ||
  284             sa->sa_len != sizeof(struct sockaddr_in6))
  285                 return;
  286 
  287         if ((unsigned)cmd >= PRC_NCMDS)
  288                 return;
  289         if (PRC_IS_REDIRECT(cmd))
  290                 notify = in6_rtchange, d = NULL;
  291         else if (cmd == PRC_HOSTDEAD)
  292                 d = NULL;
  293         else if (inet6ctlerrmap[cmd] == 0)
  294                 return;
  295 
  296         /* if the parameter is from icmp6, decode it. */
  297         if (d != NULL) {
  298                 ip6cp = (struct ip6ctlparam *)d;
  299                 m = ip6cp->ip6c_m;
  300                 ip6 = ip6cp->ip6c_ip6;
  301                 off = ip6cp->ip6c_off;
  302                 sa6_src = ip6cp->ip6c_src;
  303         } else {
  304                 m = NULL;
  305                 ip6 = NULL;
  306                 sa6_src = &sa6_any;
  307         }
  308 
  309         (void) in6_pcbnotify(&ripcb, sa, 0, (const struct sockaddr *)sa6_src,
  310                              0, cmd, notify);
  311 }
  312 
  313 /*
  314  * Generate IPv6 header and pass packet to ip6_output.
  315  * Tack on options user may have setup with control call.
  316  */
  317 int
  318 #if __STDC__
  319 rip6_output(struct mbuf *m, ...)
  320 #else
  321 rip6_output(m, va_alist)
  322         struct mbuf *m;
  323         va_dcl
  324 #endif
  325 {
  326         struct socket *so;
  327         struct sockaddr_in6 *dstsock;
  328         struct mbuf *control;
  329         struct in6_addr *dst;
  330         struct ip6_hdr *ip6;
  331         struct inpcb *in6p;
  332         u_int   plen = m->m_pkthdr.len;
  333         int error = 0;
  334         struct ip6_pktopts opt, *optp = 0;
  335         struct ifnet *oifp = NULL;
  336         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
  337         int priv = 0;
  338         va_list ap;
  339 
  340         va_start(ap, m);
  341         so = va_arg(ap, struct socket *);
  342         dstsock = va_arg(ap, struct sockaddr_in6 *);
  343         control = va_arg(ap, struct mbuf *);
  344         va_end(ap);
  345 
  346         in6p = sotoin6pcb(so);
  347 
  348         priv = 0;
  349         if (so->so_cred->cr_uid == 0)
  350                 priv = 1;
  351         dst = &dstsock->sin6_addr;
  352         if (control) {
  353                 if ((error = ip6_setpktoptions(control, &opt, priv, 0)) != 0)
  354                         goto bad;
  355                 optp = &opt;
  356         } else
  357                 optp = in6p->in6p_outputopts;
  358 
  359         /*
  360          * For an ICMPv6 packet, we should know its type and code
  361          * to update statistics.
  362          */
  363         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  364                 struct icmp6_hdr *icmp6;
  365                 if (m->m_len < sizeof(struct icmp6_hdr) &&
  366                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
  367                         error = ENOBUFS;
  368                         goto bad;
  369                 }
  370                 icmp6 = mtod(m, struct icmp6_hdr *);
  371                 type = icmp6->icmp6_type;
  372                 code = icmp6->icmp6_code;
  373         }
  374 
  375         M_PREPEND(m, sizeof(*ip6), M_TRYWAIT);
  376         ip6 = mtod(m, struct ip6_hdr *);
  377 
  378         /*
  379          * Next header might not be ICMP6 but use its pseudo header anyway.
  380          */
  381         ip6->ip6_dst = *dst;
  382 
  383         /*
  384          * If the scope of the destination is link-local, embed the interface
  385          * index in the address.
  386          *
  387          * XXX advanced-api value overrides sin6_scope_id
  388          */
  389         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
  390                 struct in6_pktinfo *pi;
  391 
  392                 /*
  393                  * XXX Boundary check is assumed to be already done in
  394                  * ip6_setpktoptions().
  395                  */
  396                 if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) {
  397                         ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
  398                         oifp = ifnet_byindex(pi->ipi6_ifindex);
  399                 } else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
  400                          in6p->in6p_moptions &&
  401                          in6p->in6p_moptions->im6o_multicast_ifp) {
  402                         oifp = in6p->in6p_moptions->im6o_multicast_ifp;
  403                         ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
  404                 } else if (dstsock->sin6_scope_id) {
  405                         /* boundary check */
  406                         if (dstsock->sin6_scope_id < 0
  407                          || if_index < dstsock->sin6_scope_id) {
  408                                 error = ENXIO;  /* XXX EINVAL? */
  409                                 goto bad;
  410                         }
  411                         ip6->ip6_dst.s6_addr16[1]
  412                                 = htons(dstsock->sin6_scope_id & 0xffff);/*XXX*/
  413                 }
  414         }
  415 
  416         /*
  417          * Source address selection.
  418          */
  419         {
  420                 struct in6_addr *in6a;
  421 
  422                 if ((in6a = in6_selectsrc(dstsock, optp,
  423                                           in6p->in6p_moptions,
  424                                           &in6p->in6p_route,
  425                                           &in6p->in6p_laddr,
  426                                           &error)) == 0) {
  427                         if (error == 0)
  428                                 error = EADDRNOTAVAIL;
  429                         goto bad;
  430                 }
  431                 ip6->ip6_src = *in6a;
  432                 if (in6p->in6p_route.ro_rt)
  433                         oifp = ifnet_byindex(in6p->in6p_route.ro_rt->rt_ifp->if_index);
  434         }
  435         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
  436                 (in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK);
  437         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
  438                 (IPV6_VERSION & IPV6_VERSION_MASK);
  439         /* ip6_plen will be filled in ip6_output, so not fill it here. */
  440         ip6->ip6_nxt = in6p->in6p_ip6_nxt;
  441         ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
  442 
  443         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
  444             in6p->in6p_cksum != -1) {
  445                 struct mbuf *n;
  446                 int off;
  447                 u_int16_t *p;
  448 
  449                 /* compute checksum */
  450                 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
  451                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
  452                 else
  453                         off = in6p->in6p_cksum;
  454                 if (plen < off + 1) {
  455                         error = EINVAL;
  456                         goto bad;
  457                 }
  458                 off += sizeof(struct ip6_hdr);
  459 
  460                 n = m;
  461                 while (n && n->m_len <= off) {
  462                         off -= n->m_len;
  463                         n = n->m_next;
  464                 }
  465                 if (!n)
  466                         goto bad;
  467                 p = (u_int16_t *)(mtod(n, caddr_t) + off);
  468                 *p = 0;
  469                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
  470         }
  471 
  472         error = ip6_output(m, optp, &in6p->in6p_route, 0,
  473                            in6p->in6p_moptions, &oifp, in6p);
  474         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  475                 if (oifp)
  476                         icmp6_ifoutstat_inc(oifp, type, code);
  477                 icmp6stat.icp6s_outhist[type]++;
  478         } else
  479                 rip6stat.rip6s_opackets++;
  480 
  481         goto freectl;
  482 
  483  bad:
  484         if (m)
  485                 m_freem(m);
  486 
  487  freectl:
  488         if (optp == &opt && optp->ip6po_rthdr && optp->ip6po_route.ro_rt)
  489                 RTFREE(optp->ip6po_route.ro_rt);
  490         if (control) {
  491                 if (optp == &opt)
  492                         ip6_clearpktopts(optp, 0, -1);
  493                 m_freem(control);
  494         }
  495         return(error);
  496 }
  497 
  498 /*
  499  * Raw IPv6 socket option processing.
  500  */
  501 int
  502 rip6_ctloutput(so, sopt)
  503         struct socket *so;
  504         struct sockopt *sopt;
  505 {
  506         int error;
  507 
  508         if (sopt->sopt_level == IPPROTO_ICMPV6)
  509                 /*
  510                  * XXX: is it better to call icmp6_ctloutput() directly
  511                  * from protosw?
  512                  */
  513                 return(icmp6_ctloutput(so, sopt));
  514         else if (sopt->sopt_level != IPPROTO_IPV6)
  515                 return (EINVAL);
  516 
  517         error = 0;
  518 
  519         switch (sopt->sopt_dir) {
  520         case SOPT_GET:
  521                 switch (sopt->sopt_name) {
  522                 case MRT6_INIT:
  523                 case MRT6_DONE:
  524                 case MRT6_ADD_MIF:
  525                 case MRT6_DEL_MIF:
  526                 case MRT6_ADD_MFC:
  527                 case MRT6_DEL_MFC:
  528                 case MRT6_PIM:
  529                         error = ip6_mrouter_get(so, sopt);
  530                         break;
  531                 default:
  532                         error = ip6_ctloutput(so, sopt);
  533                         break;
  534                 }
  535                 break;
  536 
  537         case SOPT_SET:
  538                 switch (sopt->sopt_name) {
  539                 case MRT6_INIT:
  540                 case MRT6_DONE:
  541                 case MRT6_ADD_MIF:
  542                 case MRT6_DEL_MIF:
  543                 case MRT6_ADD_MFC:
  544                 case MRT6_DEL_MFC:
  545                 case MRT6_PIM:
  546                         error = ip6_mrouter_set(so, sopt);
  547                         break;
  548                 default:
  549                         error = ip6_ctloutput(so, sopt);
  550                         break;
  551                 }
  552                 break;
  553         }
  554 
  555         return (error);
  556 }
  557 
  558 static int
  559 rip6_attach(struct socket *so, int proto, struct thread *td)
  560 {
  561         struct inpcb *inp;
  562         int error, s;
  563 
  564         inp = sotoinpcb(so);
  565         if (inp)
  566                 panic("rip6_attach");
  567         if (td && (error = suser(td)) != 0)
  568                 return error;
  569 
  570         error = soreserve(so, rip_sendspace, rip_recvspace);
  571         if (error)
  572                 return error;
  573         s = splnet();
  574         error = in_pcballoc(so, &ripcbinfo, td);
  575         splx(s);
  576         if (error)
  577                 return error;
  578         inp = (struct inpcb *)so->so_pcb;
  579         inp->inp_vflag |= INP_IPV6;
  580         inp->in6p_ip6_nxt = (long)proto;
  581         inp->in6p_hops = -1;    /* use kernel default */
  582         inp->in6p_cksum = -1;
  583         MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *,
  584                sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
  585         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
  586         return 0;
  587 }
  588 
  589 static int
  590 rip6_detach(struct socket *so)
  591 {
  592         struct inpcb *inp;
  593 
  594         inp = sotoinpcb(so);
  595         if (inp == 0)
  596                 panic("rip6_detach");
  597         /* xxx: RSVP */
  598         if (so == ip6_mrouter)
  599                 ip6_mrouter_done();
  600         if (inp->in6p_icmp6filt) {
  601                 FREE(inp->in6p_icmp6filt, M_PCB);
  602                 inp->in6p_icmp6filt = NULL;
  603         }
  604         in6_pcbdetach(inp);
  605         return 0;
  606 }
  607 
  608 static int
  609 rip6_abort(struct socket *so)
  610 {
  611         soisdisconnected(so);
  612         return rip6_detach(so);
  613 }
  614 
  615 static int
  616 rip6_disconnect(struct socket *so)
  617 {
  618         struct inpcb *inp = sotoinpcb(so);
  619 
  620         if ((so->so_state & SS_ISCONNECTED) == 0)
  621                 return ENOTCONN;
  622         inp->in6p_faddr = in6addr_any;
  623         return rip6_abort(so);
  624 }
  625 
  626 static int
  627 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  628 {
  629         struct inpcb *inp = sotoinpcb(so);
  630         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  631         struct ifaddr *ia = NULL;
  632 
  633         if (nam->sa_len != sizeof(*addr))
  634                 return EINVAL;
  635 
  636         if (TAILQ_EMPTY(&ifnet) || addr->sin6_family != AF_INET6)
  637                 return EADDRNOTAVAIL;
  638 #ifdef ENABLE_DEFAULT_SCOPE
  639         if (addr->sin6_scope_id == 0) { /* not change if specified  */
  640                 addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
  641         }
  642 #endif
  643         if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
  644             (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0)
  645                 return EADDRNOTAVAIL;
  646         if (ia &&
  647             ((struct in6_ifaddr *)ia)->ia6_flags &
  648             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
  649              IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
  650                 return(EADDRNOTAVAIL);
  651         }
  652         inp->in6p_laddr = addr->sin6_addr;
  653         return 0;
  654 }
  655 
  656 static int
  657 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  658 {
  659         struct inpcb *inp = sotoinpcb(so);
  660         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  661         struct in6_addr *in6a = NULL;
  662         int error = 0;
  663 #ifdef ENABLE_DEFAULT_SCOPE
  664         struct sockaddr_in6 tmp;
  665 #endif
  666 
  667         if (nam->sa_len != sizeof(*addr))
  668                 return EINVAL;
  669         if (TAILQ_EMPTY(&ifnet))
  670                 return EADDRNOTAVAIL;
  671         if (addr->sin6_family != AF_INET6)
  672                 return EAFNOSUPPORT;
  673 #ifdef ENABLE_DEFAULT_SCOPE
  674         if (addr->sin6_scope_id == 0) { /* not change if specified  */
  675                 /* avoid overwrites */
  676                 tmp = *addr;
  677                 addr = &tmp;
  678                 addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
  679         }
  680 #endif
  681         /* Source address selection. XXX: need pcblookup? */
  682         in6a = in6_selectsrc(addr, inp->in6p_outputopts,
  683                              inp->in6p_moptions, &inp->in6p_route,
  684                              &inp->in6p_laddr, &error);
  685         if (in6a == NULL)
  686                 return (error ? error : EADDRNOTAVAIL);
  687         inp->in6p_laddr = *in6a;
  688         inp->in6p_faddr = addr->sin6_addr;
  689         soisconnected(so);
  690         return 0;
  691 }
  692 
  693 static int
  694 rip6_shutdown(struct socket *so)
  695 {
  696         socantsendmore(so);
  697         return 0;
  698 }
  699 
  700 static int
  701 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  702          struct mbuf *control, struct thread *td)
  703 {
  704         struct inpcb *inp = sotoinpcb(so);
  705         struct sockaddr_in6 tmp;
  706         struct sockaddr_in6 *dst;
  707 
  708         /* always copy sockaddr to avoid overwrites */
  709         if (so->so_state & SS_ISCONNECTED) {
  710                 if (nam) {
  711                         m_freem(m);
  712                         return EISCONN;
  713                 }
  714                 /* XXX */
  715                 bzero(&tmp, sizeof(tmp));
  716                 tmp.sin6_family = AF_INET6;
  717                 tmp.sin6_len = sizeof(struct sockaddr_in6);
  718                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
  719                       sizeof(struct in6_addr));
  720                 dst = &tmp;
  721         } else {
  722                 if (nam == NULL) {
  723                         m_freem(m);
  724                         return ENOTCONN;
  725                 }
  726                 tmp = *(struct sockaddr_in6 *)nam;
  727                 dst = &tmp;
  728         }
  729 #ifdef ENABLE_DEFAULT_SCOPE
  730         if (dst->sin6_scope_id == 0) {  /* not change if specified  */
  731                 dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr);
  732         }
  733 #endif
  734         return rip6_output(m, so, dst, control);
  735 }
  736 
  737 struct pr_usrreqs rip6_usrreqs = {
  738         rip6_abort, pru_accept_notsupp, rip6_attach, rip6_bind, rip6_connect,
  739         pru_connect2_notsupp, in6_control, rip6_detach, rip6_disconnect,
  740         pru_listen_notsupp, in6_setpeeraddr, pru_rcvd_notsupp,
  741         pru_rcvoob_notsupp, rip6_send, pru_sense_null, rip6_shutdown,
  742         in6_setsockaddr, sosend, soreceive, sopoll
  743 };

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