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 1.50.2.2.2.1 2005/10/21 11:10:46 suz 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  * 4. Neither the name of the University nor the names of its contributors
   45  *    may be used to endorse or promote products derived from this software
   46  *    without specific prior written permission.
   47  *
   48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   58  * SUCH DAMAGE.
   59  *
   60  *      @(#)raw_ip.c    8.2 (Berkeley) 1/4/94
   61  */
   62 
   63 #include "opt_ipsec.h"
   64 #include "opt_inet6.h"
   65 
   66 #include <sys/param.h>
   67 #include <sys/errno.h>
   68 #include <sys/lock.h>
   69 #include <sys/malloc.h>
   70 #include <sys/mbuf.h>
   71 #include <sys/proc.h>
   72 #include <sys/protosw.h>
   73 #include <sys/signalvar.h>
   74 #include <sys/socket.h>
   75 #include <sys/socketvar.h>
   76 #include <sys/sx.h>
   77 #include <sys/systm.h>
   78 
   79 #include <net/if.h>
   80 #include <net/if_types.h>
   81 #include <net/route.h>
   82 
   83 #include <netinet/in.h>
   84 #include <netinet/in_var.h>
   85 #include <netinet/in_systm.h>
   86 #include <netinet/icmp6.h>
   87 #include <netinet/in_pcb.h>
   88 #include <netinet/ip6.h>
   89 #include <netinet6/ip6protosw.h>
   90 #include <netinet6/ip6_mroute.h>
   91 #include <netinet6/in6_pcb.h>
   92 #include <netinet6/ip6_var.h>
   93 #include <netinet6/nd6.h>
   94 #include <netinet6/raw_ip6.h>
   95 #ifdef ENABLE_DEFAULT_SCOPE
   96 #include <netinet6/scope6_var.h>
   97 #endif
   98 
   99 #ifdef IPSEC
  100 #include <netinet6/ipsec.h>
  101 #include <netinet6/ipsec6.h>
  102 #endif /*IPSEC*/
  103 
  104 #ifdef FAST_IPSEC
  105 #include <netipsec/ipsec.h>
  106 #include <netipsec/ipsec6.h>
  107 #endif /* FAST_IPSEC */
  108 
  109 #include <machine/stdarg.h>
  110 
  111 #define satosin6(sa)    ((struct sockaddr_in6 *)(sa))
  112 #define ifatoia6(ifa)   ((struct in6_ifaddr *)(ifa))
  113 
  114 /*
  115  * Raw interface to IP6 protocol.
  116  */
  117 
  118 extern struct   inpcbhead ripcb;
  119 extern struct   inpcbinfo ripcbinfo;
  120 extern u_long   rip_sendspace;
  121 extern u_long   rip_recvspace;
  122 
  123 struct rip6stat rip6stat;
  124 
  125 /*
  126  * Setup generic address and protocol structures
  127  * for raw_input routine, then pass them along with
  128  * mbuf chain.
  129  */
  130 int
  131 rip6_input(mp, offp, proto)
  132         struct  mbuf **mp;
  133         int     *offp, proto;
  134 {
  135         struct mbuf *m = *mp;
  136         register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  137         register struct inpcb *in6p;
  138         struct inpcb *last = 0;
  139         struct mbuf *opts = NULL;
  140         struct sockaddr_in6 fromsa;
  141 
  142         rip6stat.rip6s_ipackets++;
  143 
  144         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
  145                 /* XXX send icmp6 host/port unreach? */
  146                 m_freem(m);
  147                 return IPPROTO_DONE;
  148         }
  149 
  150         init_sin6(&fromsa, m); /* general init */
  151 
  152         INP_INFO_RLOCK(&ripcbinfo);
  153         LIST_FOREACH(in6p, &ripcb, inp_list) {
  154                 INP_LOCK(in6p);
  155                 if ((in6p->in6p_vflag & INP_IPV6) == 0) {
  156 docontinue:
  157                         INP_UNLOCK(in6p);
  158                         continue;
  159                 }
  160                 if (in6p->in6p_ip6_nxt &&
  161                     in6p->in6p_ip6_nxt != proto)
  162                         goto docontinue;
  163                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
  164                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
  165                         goto docontinue;
  166                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
  167                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
  168                         goto docontinue;
  169                 if (in6p->in6p_cksum != -1) {
  170                         rip6stat.rip6s_isum++;
  171                         if (in6_cksum(m, ip6->ip6_nxt, *offp,
  172                             m->m_pkthdr.len - *offp)) {
  173                                 rip6stat.rip6s_badsum++;
  174                                 goto docontinue;
  175                         }
  176                 }
  177                 if (last) {
  178                         struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
  179 
  180 #if defined(IPSEC) || defined(FAST_IPSEC)
  181                         /*
  182                          * Check AH/ESP integrity.
  183                          */
  184                         if (n && ipsec6_in_reject(n, last)) {
  185                                 m_freem(n);
  186 #ifdef IPSEC
  187                                 ipsec6stat.in_polvio++;
  188 #endif /*IPSEC*/
  189                                 /* do not inject data into pcb */
  190                         } else
  191 #endif /*IPSEC || FAST_IPSEC*/
  192                         if (n) {
  193                                 if (last->in6p_flags & IN6P_CONTROLOPTS ||
  194                                     last->in6p_socket->so_options & SO_TIMESTAMP)
  195                                         ip6_savecontrol(last, n, &opts);
  196                                 /* strip intermediate headers */
  197                                 m_adj(n, *offp);
  198                                 if (sbappendaddr(&last->in6p_socket->so_rcv,
  199                                                 (struct sockaddr *)&fromsa,
  200                                                  n, opts) == 0) {
  201                                         m_freem(n);
  202                                         if (opts)
  203                                                 m_freem(opts);
  204                                         rip6stat.rip6s_fullsock++;
  205                                 } else
  206                                         sorwakeup(last->in6p_socket);
  207                                 opts = NULL;
  208                         }
  209                         INP_UNLOCK(last);
  210                 }
  211                 last = in6p;
  212         }
  213 #if defined(IPSEC) || defined(FAST_IPSEC)
  214         /*
  215          * Check AH/ESP integrity.
  216          */
  217         if (last && ipsec6_in_reject(m, last)) {
  218                 m_freem(m);
  219 #ifdef IPSEC
  220                 ipsec6stat.in_polvio++;
  221 #endif /*IPSEC*/
  222                 ip6stat.ip6s_delivered--;
  223                 /* do not inject data into pcb */
  224                 INP_UNLOCK(last);
  225         } else
  226 #endif /*IPSEC || FAST_IPSEC*/
  227         if (last) {
  228                 if (last->in6p_flags & IN6P_CONTROLOPTS ||
  229                     last->in6p_socket->so_options & SO_TIMESTAMP)
  230                         ip6_savecontrol(last, m, &opts);
  231                 /* strip intermediate headers */
  232                 m_adj(m, *offp);
  233                 if (sbappendaddr(&last->in6p_socket->so_rcv,
  234                                 (struct sockaddr *)&fromsa, m, opts) == 0) {
  235                         m_freem(m);
  236                         if (opts)
  237                                 m_freem(opts);
  238                         rip6stat.rip6s_fullsock++;
  239                 } else
  240                         sorwakeup(last->in6p_socket);
  241                 INP_UNLOCK(last);
  242         } else {
  243                 rip6stat.rip6s_nosock++;
  244                 if (m->m_flags & M_MCAST)
  245                         rip6stat.rip6s_nosockmcast++;
  246                 if (proto == IPPROTO_NONE)
  247                         m_freem(m);
  248                 else {
  249                         char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
  250                         icmp6_error(m, ICMP6_PARAM_PROB,
  251                                     ICMP6_PARAMPROB_NEXTHEADER,
  252                                     prvnxtp - mtod(m, char *));
  253                 }
  254                 ip6stat.ip6s_delivered--;
  255         }
  256         INP_INFO_RUNLOCK(&ripcbinfo);
  257         return IPPROTO_DONE;
  258 }
  259 
  260 void
  261 rip6_ctlinput(cmd, sa, d)
  262         int cmd;
  263         struct sockaddr *sa;
  264         void *d;
  265 {
  266         struct ip6_hdr *ip6;
  267         struct mbuf *m;
  268         int off = 0;
  269         struct ip6ctlparam *ip6cp = NULL;
  270         const struct sockaddr_in6 *sa6_src = NULL;
  271         void *cmdarg;
  272         struct inpcb *(*notify) __P((struct inpcb *, int)) = in6_rtchange;
  273 
  274         if (sa->sa_family != AF_INET6 ||
  275             sa->sa_len != sizeof(struct sockaddr_in6))
  276                 return;
  277 
  278         if ((unsigned)cmd >= PRC_NCMDS)
  279                 return;
  280         if (PRC_IS_REDIRECT(cmd))
  281                 notify = in6_rtchange, d = NULL;
  282         else if (cmd == PRC_HOSTDEAD)
  283                 d = NULL;
  284         else if (inet6ctlerrmap[cmd] == 0)
  285                 return;
  286 
  287         /* if the parameter is from icmp6, decode it. */
  288         if (d != NULL) {
  289                 ip6cp = (struct ip6ctlparam *)d;
  290                 m = ip6cp->ip6c_m;
  291                 ip6 = ip6cp->ip6c_ip6;
  292                 off = ip6cp->ip6c_off;
  293                 cmdarg = ip6cp->ip6c_cmdarg;
  294                 sa6_src = ip6cp->ip6c_src;
  295         } else {
  296                 m = NULL;
  297                 ip6 = NULL;
  298                 cmdarg = NULL;
  299                 sa6_src = &sa6_any;
  300         }
  301 
  302         (void) in6_pcbnotify(&ripcbinfo, sa, 0,
  303                              (const struct sockaddr *)sa6_src,
  304                              0, cmd, cmdarg, notify);
  305 }
  306 
  307 /*
  308  * Generate IPv6 header and pass packet to ip6_output.
  309  * Tack on options user may have setup with control call.
  310  */
  311 int
  312 #if __STDC__
  313 rip6_output(struct mbuf *m, ...)
  314 #else
  315 rip6_output(m, va_alist)
  316         struct mbuf *m;
  317         va_dcl
  318 #endif
  319 {
  320         struct mbuf *control;
  321         struct socket *so;
  322         struct sockaddr_in6 *dstsock;
  323         struct in6_addr *dst;
  324         struct ip6_hdr *ip6;
  325         struct inpcb *in6p;
  326         u_int   plen = m->m_pkthdr.len;
  327         int error = 0;
  328         struct ip6_pktopts opt, *stickyopt = NULL;
  329         struct ifnet *oifp = NULL;
  330         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
  331         int priv = 0;
  332         struct in6_addr *in6a;
  333         va_list ap;
  334 
  335         va_start(ap, m);
  336         so = va_arg(ap, struct socket *);
  337         dstsock = va_arg(ap, struct sockaddr_in6 *);
  338         control = va_arg(ap, struct mbuf *);
  339         va_end(ap);
  340 
  341         in6p = sotoin6pcb(so);
  342         INP_LOCK(in6p);
  343         stickyopt = in6p->in6p_outputopts;
  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_setpktopts(control, &opt,
  351                     stickyopt, priv, 0, so->so_proto->pr_protocol))
  352                     != 0) {
  353                         goto bad;
  354                 }
  355                 in6p->in6p_outputopts = &opt;
  356         }
  357 
  358         /*
  359          * For an ICMPv6 packet, we should know its type and code
  360          * to update statistics.
  361          */
  362         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  363                 struct icmp6_hdr *icmp6;
  364                 if (m->m_len < sizeof(struct icmp6_hdr) &&
  365                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
  366                         error = ENOBUFS;
  367                         goto bad;
  368                 }
  369                 icmp6 = mtod(m, struct icmp6_hdr *);
  370                 type = icmp6->icmp6_type;
  371                 code = icmp6->icmp6_code;
  372         }
  373 
  374         M_PREPEND(m, sizeof(*ip6), M_DONTWAIT);
  375         if (m == NULL) {
  376                 error = ENOBUFS;
  377                 goto bad;
  378         }
  379         ip6 = mtod(m, struct ip6_hdr *);
  380 
  381         /*
  382          * Next header might not be ICMP6 but use its pseudo header anyway.
  383          */
  384         ip6->ip6_dst = *dst;
  385 
  386         /*
  387          * If the scope of the destination is link-local, embed the interface
  388          * index in the address.
  389          *
  390          * XXX advanced-api value overrides sin6_scope_id
  391          */
  392         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
  393                 struct in6_pktinfo *pi;
  394 
  395                 /*
  396                  * XXX Boundary check is assumed to be already done in
  397                  * ip6_setpktopts().
  398                  */
  399                 if (in6p->in6p_outputopts &&
  400                     (pi = in6p->in6p_outputopts->ip6po_pktinfo) &&
  401                     pi->ipi6_ifindex) {
  402                         ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
  403                         oifp = ifnet_byindex(pi->ipi6_ifindex);
  404                 } else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
  405                          in6p->in6p_moptions &&
  406                          in6p->in6p_moptions->im6o_multicast_ifp) {
  407                         oifp = in6p->in6p_moptions->im6o_multicast_ifp;
  408                         ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
  409                 } else if (dstsock->sin6_scope_id) {
  410                         /* boundary check */
  411                         if (dstsock->sin6_scope_id < 0 ||
  412                             if_index < dstsock->sin6_scope_id) {
  413                                 error = ENXIO;  /* XXX EINVAL? */
  414                                 goto bad;
  415                         }
  416                         ip6->ip6_dst.s6_addr16[1] =
  417                             htons(dstsock->sin6_scope_id & 0xffff); /* XXX */
  418                 }
  419         }
  420 
  421         /*
  422          * Source address selection.
  423          */
  424         if ((in6a = in6_selectsrc(dstsock, in6p->in6p_outputopts,
  425             in6p->in6p_moptions, NULL, &in6p->in6p_laddr, &error)) == 0) {
  426                 if (error == 0)
  427                         error = EADDRNOTAVAIL;
  428                 goto bad;
  429         }
  430         ip6->ip6_src = *in6a;
  431         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
  432                 (in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK);
  433         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
  434                 (IPV6_VERSION & IPV6_VERSION_MASK);
  435         /* ip6_plen will be filled in ip6_output, so not fill it here. */
  436         ip6->ip6_nxt = in6p->in6p_ip6_nxt;
  437         ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
  438 
  439         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
  440             in6p->in6p_cksum != -1) {
  441                 struct mbuf *n;
  442                 int off;
  443                 u_int16_t *p;
  444 
  445                 /* compute checksum */
  446                 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
  447                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
  448                 else
  449                         off = in6p->in6p_cksum;
  450                 if (plen < off + 1) {
  451                         error = EINVAL;
  452                         goto bad;
  453                 }
  454                 off += sizeof(struct ip6_hdr);
  455 
  456                 n = m;
  457                 while (n && n->m_len <= off) {
  458                         off -= n->m_len;
  459                         n = n->m_next;
  460                 }
  461                 if (!n)
  462                         goto bad;
  463                 p = (u_int16_t *)(mtod(n, caddr_t) + off);
  464                 *p = 0;
  465                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
  466         }
  467 
  468         error = ip6_output(m, in6p->in6p_outputopts, NULL, 0,
  469                            in6p->in6p_moptions, &oifp, in6p);
  470         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  471                 if (oifp)
  472                         icmp6_ifoutstat_inc(oifp, type, code);
  473                 icmp6stat.icp6s_outhist[type]++;
  474         } else
  475                 rip6stat.rip6s_opackets++;
  476 
  477         goto freectl;
  478 
  479  bad:
  480         if (m)
  481                 m_freem(m);
  482 
  483  freectl:
  484         if (control) {
  485                 ip6_clearpktopts(in6p->in6p_outputopts, -1);
  486                 in6p->in6p_outputopts = stickyopt;
  487                 m_freem(control);
  488         }
  489         INP_UNLOCK(in6p);
  490         return (error);
  491 }
  492 
  493 /*
  494  * Raw IPv6 socket option processing.
  495  */
  496 int
  497 rip6_ctloutput(so, sopt)
  498         struct socket *so;
  499         struct sockopt *sopt;
  500 {
  501         int error;
  502 
  503         if (sopt->sopt_level == IPPROTO_ICMPV6)
  504                 /*
  505                  * XXX: is it better to call icmp6_ctloutput() directly
  506                  * from protosw?
  507                  */
  508                 return (icmp6_ctloutput(so, sopt));
  509         else if (sopt->sopt_level != IPPROTO_IPV6)
  510                 return (EINVAL);
  511 
  512         error = 0;
  513 
  514         switch (sopt->sopt_dir) {
  515         case SOPT_GET:
  516                 switch (sopt->sopt_name) {
  517                 case MRT6_INIT:
  518                 case MRT6_DONE:
  519                 case MRT6_ADD_MIF:
  520                 case MRT6_DEL_MIF:
  521                 case MRT6_ADD_MFC:
  522                 case MRT6_DEL_MFC:
  523                 case MRT6_PIM:
  524                         error = ip6_mrouter_get(so, sopt);
  525                         break;
  526                 case IPV6_CHECKSUM:
  527                         error = ip6_raw_ctloutput(so, sopt);
  528                         break;
  529                 default:
  530                         error = ip6_ctloutput(so, sopt);
  531                         break;
  532                 }
  533                 break;
  534 
  535         case SOPT_SET:
  536                 switch (sopt->sopt_name) {
  537                 case MRT6_INIT:
  538                 case MRT6_DONE:
  539                 case MRT6_ADD_MIF:
  540                 case MRT6_DEL_MIF:
  541                 case MRT6_ADD_MFC:
  542                 case MRT6_DEL_MFC:
  543                 case MRT6_PIM:
  544                         error = ip6_mrouter_set(so, sopt);
  545                         break;
  546                 case IPV6_CHECKSUM:
  547                         error = ip6_raw_ctloutput(so, sopt);
  548                         break;
  549                 default:
  550                         error = ip6_ctloutput(so, sopt);
  551                         break;
  552                 }
  553                 break;
  554         }
  555 
  556         return (error);
  557 }
  558 
  559 static int
  560 rip6_attach(struct socket *so, int proto, struct thread *td)
  561 {
  562         struct inpcb *inp;
  563         struct icmp6_filter *filter;
  564         int error, s;
  565 
  566         INP_INFO_WLOCK(&ripcbinfo);
  567         inp = sotoinpcb(so);
  568         if (inp) {
  569                 INP_INFO_WUNLOCK(&ripcbinfo);
  570                 panic("rip6_attach");
  571         }
  572         if (td && (error = suser(td)) != 0) {
  573                 INP_INFO_WUNLOCK(&ripcbinfo);
  574                 return error;
  575         }
  576         error = soreserve(so, rip_sendspace, rip_recvspace);
  577         if (error) {
  578                 INP_INFO_WUNLOCK(&ripcbinfo);
  579                 return error;
  580         }
  581         MALLOC(filter, struct icmp6_filter *,
  582                sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
  583         if (filter == NULL) {
  584                 INP_INFO_WUNLOCK(&ripcbinfo);
  585                 return ENOMEM;
  586         }
  587         s = splnet();
  588         error = in_pcballoc(so, &ripcbinfo, "raw6inp");
  589         splx(s);
  590         if (error) {
  591                 INP_INFO_WUNLOCK(&ripcbinfo);
  592                 FREE(filter, M_PCB);
  593                 return error;
  594         }
  595         inp = (struct inpcb *)so->so_pcb;
  596         INP_LOCK(inp);
  597         INP_INFO_WUNLOCK(&ripcbinfo);
  598         inp->inp_vflag |= INP_IPV6;
  599         inp->in6p_ip6_nxt = (long)proto;
  600         inp->in6p_hops = -1;    /* use kernel default */
  601         inp->in6p_cksum = -1;
  602         inp->in6p_icmp6filt = filter;
  603         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
  604         INP_UNLOCK(inp);
  605         return 0;
  606 }
  607 
  608 static int
  609 rip6_detach(struct socket *so)
  610 {
  611         struct inpcb *inp;
  612 
  613         INP_INFO_WLOCK(&ripcbinfo);
  614         inp = sotoinpcb(so);
  615         if (inp == 0) {
  616                 INP_INFO_WUNLOCK(&ripcbinfo);
  617                 panic("rip6_detach");
  618         }
  619         /* xxx: RSVP */
  620         if (so == ip6_mrouter)
  621                 ip6_mrouter_done();
  622         if (inp->in6p_icmp6filt) {
  623                 FREE(inp->in6p_icmp6filt, M_PCB);
  624                 inp->in6p_icmp6filt = NULL;
  625         }
  626         INP_LOCK(inp);
  627         in6_pcbdetach(inp);
  628         INP_INFO_WUNLOCK(&ripcbinfo);
  629         return 0;
  630 }
  631 
  632 static int
  633 rip6_abort(struct socket *so)
  634 {
  635         soisdisconnected(so);
  636         return rip6_detach(so);
  637 }
  638 
  639 static int
  640 rip6_disconnect(struct socket *so)
  641 {
  642         struct inpcb *inp = sotoinpcb(so);
  643 
  644         if ((so->so_state & SS_ISCONNECTED) == 0)
  645                 return ENOTCONN;
  646         inp->in6p_faddr = in6addr_any;
  647         return rip6_abort(so);
  648 }
  649 
  650 static int
  651 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  652 {
  653         struct inpcb *inp = sotoinpcb(so);
  654         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  655         struct ifaddr *ia = NULL;
  656 
  657         if (nam->sa_len != sizeof(*addr))
  658                 return EINVAL;
  659         if (TAILQ_EMPTY(&ifnet) || addr->sin6_family != AF_INET6)
  660                 return EADDRNOTAVAIL;
  661 #ifdef ENABLE_DEFAULT_SCOPE
  662         if (addr->sin6_scope_id == 0) { /* not change if specified  */
  663                 addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
  664         }
  665 #endif
  666         if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
  667             (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0)
  668                 return EADDRNOTAVAIL;
  669         if (ia &&
  670             ((struct in6_ifaddr *)ia)->ia6_flags &
  671             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
  672              IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
  673                 return (EADDRNOTAVAIL);
  674         }
  675         INP_INFO_WLOCK(&ripcbinfo);
  676         INP_LOCK(inp);
  677         inp->in6p_laddr = addr->sin6_addr;
  678         INP_UNLOCK(inp);
  679         INP_INFO_WUNLOCK(&ripcbinfo);
  680         return 0;
  681 }
  682 
  683 static int
  684 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  685 {
  686         struct inpcb *inp = sotoinpcb(so);
  687         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  688         struct in6_addr *in6a = NULL;
  689         int error = 0;
  690 #ifdef ENABLE_DEFAULT_SCOPE
  691         struct sockaddr_in6 tmp;
  692 #endif
  693 
  694         if (nam->sa_len != sizeof(*addr))
  695                 return EINVAL;
  696         if (TAILQ_EMPTY(&ifnet))
  697                 return EADDRNOTAVAIL;
  698         if (addr->sin6_family != AF_INET6)
  699                 return EAFNOSUPPORT;
  700 #ifdef ENABLE_DEFAULT_SCOPE
  701         if (addr->sin6_scope_id == 0) { /* not change if specified  */
  702                 /* avoid overwrites */
  703                 tmp = *addr;
  704                 addr = &tmp;
  705                 addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
  706         }
  707 #endif
  708         INP_INFO_WLOCK(&ripcbinfo);
  709         INP_LOCK(inp);
  710         /* Source address selection. XXX: need pcblookup? */
  711         in6a = in6_selectsrc(addr, inp->in6p_outputopts,
  712                              inp->in6p_moptions, NULL,
  713                              &inp->in6p_laddr, &error);
  714         if (in6a == NULL) {
  715                 INP_UNLOCK(inp);
  716                 INP_INFO_WUNLOCK(&ripcbinfo);
  717                 return (error ? error : EADDRNOTAVAIL);
  718         }
  719         inp->in6p_laddr = *in6a;
  720         inp->in6p_faddr = addr->sin6_addr;
  721         soisconnected(so);
  722         INP_UNLOCK(inp);
  723         INP_INFO_WUNLOCK(&ripcbinfo);
  724         return 0;
  725 }
  726 
  727 static int
  728 rip6_shutdown(struct socket *so)
  729 {
  730         struct inpcb *inp;
  731 
  732         INP_INFO_RLOCK(&ripcbinfo);
  733         inp = sotoinpcb(so);
  734         INP_LOCK(inp);
  735         INP_INFO_RUNLOCK(&ripcbinfo);
  736         socantsendmore(so);
  737         INP_UNLOCK(inp);
  738         return 0;
  739 }
  740 
  741 static int
  742 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  743          struct mbuf *control, struct thread *td)
  744 {
  745         struct inpcb *inp = sotoinpcb(so);
  746         struct sockaddr_in6 tmp;
  747         struct sockaddr_in6 *dst;
  748         int ret;
  749 
  750         INP_INFO_WLOCK(&ripcbinfo);
  751         /* always copy sockaddr to avoid overwrites */
  752         /* Unlocked read. */
  753         if (so->so_state & SS_ISCONNECTED) {
  754                 if (nam) {
  755                         INP_INFO_WUNLOCK(&ripcbinfo);
  756                         m_freem(m);
  757                         return EISCONN;
  758                 }
  759                 /* XXX */
  760                 bzero(&tmp, sizeof(tmp));
  761                 tmp.sin6_family = AF_INET6;
  762                 tmp.sin6_len = sizeof(struct sockaddr_in6);
  763                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
  764                       sizeof(struct in6_addr));
  765                 dst = &tmp;
  766         } else {
  767                 if (nam == NULL) {
  768                         INP_INFO_WUNLOCK(&ripcbinfo);
  769                         m_freem(m);
  770                         return ENOTCONN;
  771                 }
  772                 tmp = *(struct sockaddr_in6 *)nam;
  773                 dst = &tmp;
  774         }
  775 #ifdef ENABLE_DEFAULT_SCOPE
  776         if (dst->sin6_scope_id == 0) {  /* not change if specified  */
  777                 dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr);
  778         }
  779 #endif
  780         ret = rip6_output(m, so, dst, control);
  781         INP_INFO_WUNLOCK(&ripcbinfo);
  782         return (ret);
  783 }
  784 
  785 struct pr_usrreqs rip6_usrreqs = {
  786         .pru_abort =            rip6_abort,
  787         .pru_attach =           rip6_attach,
  788         .pru_bind =             rip6_bind,
  789         .pru_connect =          rip6_connect,
  790         .pru_control =          in6_control,
  791         .pru_detach =           rip6_detach,
  792         .pru_disconnect =       rip6_disconnect,
  793         .pru_peeraddr =         in6_setpeeraddr,
  794         .pru_send =             rip6_send,
  795         .pru_shutdown =         rip6_shutdown,
  796         .pru_sockaddr =         in6_setsockaddr,
  797 };

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