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: releng/5.2/sys/netinet6/raw_ip6.c 122991 2003-11-26 01:40:44Z 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/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 fromsa;
  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(&fromsa, 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, n, &opts);
  202                                 /* strip intermediate headers */
  203                                 m_adj(n, *offp);
  204                                 if (sbappendaddr(&last->in6p_socket->so_rcv,
  205                                                 (struct sockaddr *)&fromsa,
  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, m, &opts);
  243                 /* strip intermediate headers */
  244                 m_adj(m, *offp);
  245                 if (sbappendaddr(&last->in6p_socket->so_rcv,
  246                                 (struct sockaddr *)&fromsa, 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 mbuf *control;
  327         struct socket *so;
  328         struct sockaddr_in6 *dstsock;
  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, *stickyopt = NULL;
  335         struct ifnet *oifp = NULL;
  336         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
  337         int priv = 0;
  338         struct in6_addr *in6a;
  339         va_list ap;
  340 
  341         va_start(ap, m);
  342         so = va_arg(ap, struct socket *);
  343         dstsock = va_arg(ap, struct sockaddr_in6 *);
  344         control = va_arg(ap, struct mbuf *);
  345         va_end(ap);
  346 
  347         in6p = sotoin6pcb(so);
  348         stickyopt = in6p->in6p_outputopts;
  349 
  350         priv = 0;
  351         if (so->so_cred->cr_uid == 0)
  352                 priv = 1;
  353         dst = &dstsock->sin6_addr;
  354         if (control) {
  355                 if ((error = ip6_setpktoptions(control, &opt,
  356                                                stickyopt, priv, 0,
  357                                                so->so_proto->pr_protocol))
  358                     != 0) {
  359                         goto bad;
  360                 }
  361                 in6p->in6p_outputopts = &opt;
  362         }
  363 
  364         /*
  365          * For an ICMPv6 packet, we should know its type and code
  366          * to update statistics.
  367          */
  368         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  369                 struct icmp6_hdr *icmp6;
  370                 if (m->m_len < sizeof(struct icmp6_hdr) &&
  371                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
  372                         error = ENOBUFS;
  373                         goto bad;
  374                 }
  375                 icmp6 = mtod(m, struct icmp6_hdr *);
  376                 type = icmp6->icmp6_type;
  377                 code = icmp6->icmp6_code;
  378         }
  379 
  380         M_PREPEND(m, sizeof(*ip6), M_TRYWAIT);
  381         ip6 = mtod(m, struct ip6_hdr *);
  382 
  383         /*
  384          * Next header might not be ICMP6 but use its pseudo header anyway.
  385          */
  386         ip6->ip6_dst = *dst;
  387 
  388         /*
  389          * If the scope of the destination is link-local, embed the interface
  390          * index in the address.
  391          *
  392          * XXX advanced-api value overrides sin6_scope_id
  393          */
  394         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
  395                 struct in6_pktinfo *pi;
  396 
  397                 /*
  398                  * XXX Boundary check is assumed to be already done in
  399                  * ip6_setpktoptions().
  400                  */
  401                 if (in6p->in6p_outputopts &&
  402                     (pi = in6p->in6p_outputopts->ip6po_pktinfo) &&
  403                     pi->ipi6_ifindex) {
  404                         ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
  405                         oifp = ifnet_byindex(pi->ipi6_ifindex);
  406                 } else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
  407                          in6p->in6p_moptions &&
  408                          in6p->in6p_moptions->im6o_multicast_ifp) {
  409                         oifp = in6p->in6p_moptions->im6o_multicast_ifp;
  410                         ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
  411                 } else if (dstsock->sin6_scope_id) {
  412                         /* boundary check */
  413                         if (dstsock->sin6_scope_id < 0 ||
  414                             if_index < dstsock->sin6_scope_id) {
  415                                 error = ENXIO;  /* XXX EINVAL? */
  416                                 goto bad;
  417                         }
  418                         ip6->ip6_dst.s6_addr16[1] =
  419                             htons(dstsock->sin6_scope_id & 0xffff); /* XXX */
  420                 }
  421         }
  422 
  423         /*
  424          * Source address selection.
  425          */
  426         if ((in6a = in6_selectsrc(dstsock, in6p->in6p_outputopts,
  427             in6p->in6p_moptions, NULL, &in6p->in6p_laddr, &error)) == 0) {
  428                 if (error == 0)
  429                         error = EADDRNOTAVAIL;
  430                 goto bad;
  431         }
  432         ip6->ip6_src = *in6a;
  433         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
  434                 (in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK);
  435         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
  436                 (IPV6_VERSION & IPV6_VERSION_MASK);
  437         /* ip6_plen will be filled in ip6_output, so not fill it here. */
  438         ip6->ip6_nxt = in6p->in6p_ip6_nxt;
  439         ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
  440 
  441         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
  442             in6p->in6p_cksum != -1) {
  443                 struct mbuf *n;
  444                 int off;
  445                 u_int16_t *p;
  446 
  447                 /* compute checksum */
  448                 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
  449                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
  450                 else
  451                         off = in6p->in6p_cksum;
  452                 if (plen < off + 1) {
  453                         error = EINVAL;
  454                         goto bad;
  455                 }
  456                 off += sizeof(struct ip6_hdr);
  457 
  458                 n = m;
  459                 while (n && n->m_len <= off) {
  460                         off -= n->m_len;
  461                         n = n->m_next;
  462                 }
  463                 if (!n)
  464                         goto bad;
  465                 p = (u_int16_t *)(mtod(n, caddr_t) + off);
  466                 *p = 0;
  467                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
  468         }
  469 
  470 #ifdef IPSEC
  471         if (ipsec_setsocket(m, so) != 0) {
  472                 error = ENOBUFS;
  473                 goto bad;
  474         }
  475 #endif /*IPSEC*/
  476 
  477         error = ip6_output(m, in6p->in6p_outputopts, NULL, 0,
  478                            in6p->in6p_moptions, &oifp, in6p);
  479         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  480                 if (oifp)
  481                         icmp6_ifoutstat_inc(oifp, type, code);
  482                 icmp6stat.icp6s_outhist[type]++;
  483         } else
  484                 rip6stat.rip6s_opackets++;
  485 
  486         goto freectl;
  487 
  488  bad:
  489         if (m)
  490                 m_freem(m);
  491 
  492  freectl:
  493         if (control) {
  494                 ip6_clearpktopts(in6p->in6p_outputopts, -1);
  495                 in6p->in6p_outputopts = stickyopt;
  496                 m_freem(control);
  497         }
  498         return (error);
  499 }
  500 
  501 /*
  502  * Raw IPv6 socket option processing.
  503  */
  504 int
  505 rip6_ctloutput(so, sopt)
  506         struct socket *so;
  507         struct sockopt *sopt;
  508 {
  509         int error;
  510 
  511         if (sopt->sopt_level == IPPROTO_ICMPV6)
  512                 /*
  513                  * XXX: is it better to call icmp6_ctloutput() directly
  514                  * from protosw?
  515                  */
  516                 return (icmp6_ctloutput(so, sopt));
  517         else if (sopt->sopt_level != IPPROTO_IPV6)
  518                 return (EINVAL);
  519 
  520         error = 0;
  521 
  522         switch (sopt->sopt_dir) {
  523         case SOPT_GET:
  524                 switch (sopt->sopt_name) {
  525                 case MRT6_INIT:
  526                 case MRT6_DONE:
  527                 case MRT6_ADD_MIF:
  528                 case MRT6_DEL_MIF:
  529                 case MRT6_ADD_MFC:
  530                 case MRT6_DEL_MFC:
  531                 case MRT6_PIM:
  532                         error = ip6_mrouter_get(so, sopt);
  533                         break;
  534                 case IPV6_CHECKSUM:
  535                         error = ip6_raw_ctloutput(so, sopt);
  536                         break;
  537                 default:
  538                         error = ip6_ctloutput(so, sopt);
  539                         break;
  540                 }
  541                 break;
  542 
  543         case SOPT_SET:
  544                 switch (sopt->sopt_name) {
  545                 case MRT6_INIT:
  546                 case MRT6_DONE:
  547                 case MRT6_ADD_MIF:
  548                 case MRT6_DEL_MIF:
  549                 case MRT6_ADD_MFC:
  550                 case MRT6_DEL_MFC:
  551                 case MRT6_PIM:
  552                         error = ip6_mrouter_set(so, sopt);
  553                         break;
  554                 case IPV6_CHECKSUM:
  555                         error = ip6_raw_ctloutput(so, sopt);
  556                         break;
  557                 default:
  558                         error = ip6_ctloutput(so, sopt);
  559                         break;
  560                 }
  561                 break;
  562         }
  563 
  564         return (error);
  565 }
  566 
  567 static int
  568 rip6_attach(struct socket *so, int proto, struct thread *td)
  569 {
  570         struct inpcb *inp;
  571         int error, s;
  572 
  573         inp = sotoinpcb(so);
  574         if (inp)
  575                 panic("rip6_attach");
  576         if (td && (error = suser(td)) != 0)
  577                 return error;
  578 
  579         error = soreserve(so, rip_sendspace, rip_recvspace);
  580         if (error)
  581                 return error;
  582         s = splnet();
  583         error = in_pcballoc(so, &ripcbinfo, td, "raw6inp");
  584         splx(s);
  585         if (error)
  586                 return error;
  587         inp = (struct inpcb *)so->so_pcb;
  588         inp->inp_vflag |= INP_IPV6;
  589         inp->in6p_ip6_nxt = (long)proto;
  590         inp->in6p_hops = -1;    /* use kernel default */
  591         inp->in6p_cksum = -1;
  592         MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *,
  593                sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
  594         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
  595         return 0;
  596 }
  597 
  598 static int
  599 rip6_detach(struct socket *so)
  600 {
  601         struct inpcb *inp;
  602 
  603         inp = sotoinpcb(so);
  604         if (inp == 0)
  605                 panic("rip6_detach");
  606         /* xxx: RSVP */
  607         if (so == ip6_mrouter)
  608                 ip6_mrouter_done();
  609         if (inp->in6p_icmp6filt) {
  610                 FREE(inp->in6p_icmp6filt, M_PCB);
  611                 inp->in6p_icmp6filt = NULL;
  612         }
  613         in6_pcbdetach(inp);
  614         return 0;
  615 }
  616 
  617 static int
  618 rip6_abort(struct socket *so)
  619 {
  620         soisdisconnected(so);
  621         return rip6_detach(so);
  622 }
  623 
  624 static int
  625 rip6_disconnect(struct socket *so)
  626 {
  627         struct inpcb *inp = sotoinpcb(so);
  628 
  629         if ((so->so_state & SS_ISCONNECTED) == 0)
  630                 return ENOTCONN;
  631         inp->in6p_faddr = in6addr_any;
  632         return rip6_abort(so);
  633 }
  634 
  635 static int
  636 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  637 {
  638         struct inpcb *inp = sotoinpcb(so);
  639         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  640         struct ifaddr *ia = NULL;
  641 
  642         if (nam->sa_len != sizeof(*addr))
  643                 return EINVAL;
  644         if (TAILQ_EMPTY(&ifnet) || addr->sin6_family != AF_INET6)
  645                 return EADDRNOTAVAIL;
  646 #ifdef ENABLE_DEFAULT_SCOPE
  647         if (addr->sin6_scope_id == 0) { /* not change if specified  */
  648                 addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
  649         }
  650 #endif
  651         if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
  652             (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0)
  653                 return EADDRNOTAVAIL;
  654         if (ia &&
  655             ((struct in6_ifaddr *)ia)->ia6_flags &
  656             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
  657              IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
  658                 return (EADDRNOTAVAIL);
  659         }
  660         inp->in6p_laddr = addr->sin6_addr;
  661         return 0;
  662 }
  663 
  664 static int
  665 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  666 {
  667         struct inpcb *inp = sotoinpcb(so);
  668         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  669         struct in6_addr *in6a = NULL;
  670         int error = 0;
  671 #ifdef ENABLE_DEFAULT_SCOPE
  672         struct sockaddr_in6 tmp;
  673 #endif
  674 
  675         if (nam->sa_len != sizeof(*addr))
  676                 return EINVAL;
  677         if (TAILQ_EMPTY(&ifnet))
  678                 return EADDRNOTAVAIL;
  679         if (addr->sin6_family != AF_INET6)
  680                 return EAFNOSUPPORT;
  681 #ifdef ENABLE_DEFAULT_SCOPE
  682         if (addr->sin6_scope_id == 0) { /* not change if specified  */
  683                 /* avoid overwrites */
  684                 tmp = *addr;
  685                 addr = &tmp;
  686                 addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
  687         }
  688 #endif
  689         /* Source address selection. XXX: need pcblookup? */
  690         in6a = in6_selectsrc(addr, inp->in6p_outputopts,
  691                              inp->in6p_moptions, NULL,
  692                              &inp->in6p_laddr, &error);
  693         if (in6a == NULL)
  694                 return (error ? error : EADDRNOTAVAIL);
  695         inp->in6p_laddr = *in6a;
  696         inp->in6p_faddr = addr->sin6_addr;
  697         soisconnected(so);
  698         return 0;
  699 }
  700 
  701 static int
  702 rip6_shutdown(struct socket *so)
  703 {
  704         socantsendmore(so);
  705         return 0;
  706 }
  707 
  708 static int
  709 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  710          struct mbuf *control, struct thread *td)
  711 {
  712         struct inpcb *inp = sotoinpcb(so);
  713         struct sockaddr_in6 tmp;
  714         struct sockaddr_in6 *dst;
  715 
  716         /* always copy sockaddr to avoid overwrites */
  717         if (so->so_state & SS_ISCONNECTED) {
  718                 if (nam) {
  719                         m_freem(m);
  720                         return EISCONN;
  721                 }
  722                 /* XXX */
  723                 bzero(&tmp, sizeof(tmp));
  724                 tmp.sin6_family = AF_INET6;
  725                 tmp.sin6_len = sizeof(struct sockaddr_in6);
  726                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
  727                       sizeof(struct in6_addr));
  728                 dst = &tmp;
  729         } else {
  730                 if (nam == NULL) {
  731                         m_freem(m);
  732                         return ENOTCONN;
  733                 }
  734                 tmp = *(struct sockaddr_in6 *)nam;
  735                 dst = &tmp;
  736         }
  737 #ifdef ENABLE_DEFAULT_SCOPE
  738         if (dst->sin6_scope_id == 0) {  /* not change if specified  */
  739                 dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr);
  740         }
  741 #endif
  742         return rip6_output(m, so, dst, control);
  743 }
  744 
  745 struct pr_usrreqs rip6_usrreqs = {
  746         rip6_abort, pru_accept_notsupp, rip6_attach, rip6_bind, rip6_connect,
  747         pru_connect2_notsupp, in6_control, rip6_detach, rip6_disconnect,
  748         pru_listen_notsupp, in6_setpeeraddr, pru_rcvd_notsupp,
  749         pru_rcvoob_notsupp, rip6_send, pru_sense_null, rip6_shutdown,
  750         in6_setsockaddr, sosend, soreceive, sopoll, pru_sosetlabel_null
  751 };

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