The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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 
   30 /*-
   31  * Copyright (c) 1982, 1986, 1988, 1993
   32  *      The Regents of the University of California.  All rights reserved.
   33  *
   34  * Redistribution and use in source and binary forms, with or without
   35  * modification, are permitted provided that the following conditions
   36  * are met:
   37  * 1. Redistributions of source code must retain the above copyright
   38  *    notice, this list of conditions and the following disclaimer.
   39  * 2. Redistributions in binary form must reproduce the above copyright
   40  *    notice, this list of conditions and the following disclaimer in the
   41  *    documentation and/or other materials provided with the distribution.
   42  * 4. Neither the name of the University nor the names of its contributors
   43  *    may be used to endorse or promote products derived from this software
   44  *    without specific prior written permission.
   45  *
   46  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   47  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   49  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   50  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   51  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   52  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   55  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   56  * SUCH DAMAGE.
   57  *
   58  *      @(#)raw_ip.c    8.2 (Berkeley) 1/4/94
   59  */
   60 
   61 #include <sys/cdefs.h>
   62 __FBSDID("$FreeBSD: releng/6.4/sys/netinet6/raw_ip6.c 182649 2008-09-01 22:57:56Z obrien $");
   63 
   64 #include "opt_ipsec.h"
   65 #include "opt_inet6.h"
   66 
   67 #include <sys/param.h>
   68 #include <sys/errno.h>
   69 #include <sys/lock.h>
   70 #include <sys/malloc.h>
   71 #include <sys/mbuf.h>
   72 #include <sys/proc.h>
   73 #include <sys/protosw.h>
   74 #include <sys/signalvar.h>
   75 #include <sys/socket.h>
   76 #include <sys/socketvar.h>
   77 #include <sys/sx.h>
   78 #include <sys/systm.h>
   79 #include <sys/syslog.h>
   80 
   81 #include <net/if.h>
   82 #include <net/if_types.h>
   83 #include <net/route.h>
   84 
   85 #include <netinet/in.h>
   86 #include <netinet/in_var.h>
   87 #include <netinet/in_systm.h>
   88 #include <netinet/icmp6.h>
   89 #include <netinet/in_pcb.h>
   90 #include <netinet/ip6.h>
   91 #include <netinet6/ip6protosw.h>
   92 #include <netinet6/ip6_mroute.h>
   93 #include <netinet6/in6_pcb.h>
   94 #include <netinet6/ip6_var.h>
   95 #include <netinet6/nd6.h>
   96 #include <netinet6/raw_ip6.h>
   97 #include <netinet6/scope6_var.h>
   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, proto, *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)(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, *optp;
  329         struct ifnet *oifp = NULL;
  330         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
  331         int priv = 0;
  332         int scope_ambiguous = 0;
  333         struct in6_addr *in6a;
  334         va_list ap;
  335 
  336         va_start(ap, m);
  337         so = va_arg(ap, struct socket *);
  338         dstsock = va_arg(ap, struct sockaddr_in6 *);
  339         control = va_arg(ap, struct mbuf *);
  340         va_end(ap);
  341 
  342         in6p = sotoin6pcb(so);
  343         INP_LOCK(in6p);
  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                     in6p->in6p_outputopts, priv, so->so_proto->pr_protocol))
  352                     != 0) {
  353                         goto bad;
  354                 }
  355                 optp = &opt;
  356         } else
  357                 optp = in6p->in6p_outputopts;
  358 
  359         /*
  360          * Check and convert scope zone ID into internal form.
  361          * XXX: we may still need to determine the zone later.
  362          */
  363         if (!(so->so_state & SS_ISCONNECTED)) {
  364                 if (dstsock->sin6_scope_id == 0 && !ip6_use_defzone)
  365                         scope_ambiguous = 1;
  366                 if ((error = sa6_embedscope(dstsock, ip6_use_defzone)) != 0)
  367                         goto bad;
  368         }
  369 
  370         /*
  371          * For an ICMPv6 packet, we should know its type and code
  372          * to update statistics.
  373          */
  374         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  375                 struct icmp6_hdr *icmp6;
  376                 if (m->m_len < sizeof(struct icmp6_hdr) &&
  377                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
  378                         error = ENOBUFS;
  379                         goto bad;
  380                 }
  381                 icmp6 = mtod(m, struct icmp6_hdr *);
  382                 type = icmp6->icmp6_type;
  383                 code = icmp6->icmp6_code;
  384         }
  385 
  386         M_PREPEND(m, sizeof(*ip6), M_DONTWAIT);
  387         if (m == NULL) {
  388                 error = ENOBUFS;
  389                 goto bad;
  390         }
  391         ip6 = mtod(m, struct ip6_hdr *);
  392 
  393         /*
  394          * Source address selection.
  395          */
  396         if ((in6a = in6_selectsrc(dstsock, optp, in6p->in6p_moptions, NULL,
  397             &in6p->in6p_laddr, &oifp, &error)) == NULL) {
  398                 if (error == 0)
  399                         error = EADDRNOTAVAIL;
  400                 goto bad;
  401         }
  402         ip6->ip6_src = *in6a;
  403 
  404         if (oifp && scope_ambiguous) {
  405                 /*
  406                  * Application should provide a proper zone ID or the use of
  407                  * default zone IDs should be enabled.  Unfortunately, some
  408                  * applications do not behave as it should, so we need a
  409                  * workaround.  Even if an appropriate ID is not determined
  410                  * (when it's required), if we can determine the outgoing
  411                  * interface. determine the zone ID based on the interface.
  412                  */
  413                 error = in6_setscope(&dstsock->sin6_addr, oifp, NULL);
  414                 if (error != 0)
  415                         goto bad;
  416         }
  417         ip6->ip6_dst = dstsock->sin6_addr;
  418 
  419         /* fill in the rest of the IPv6 header fields */
  420         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
  421                 (in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK);
  422         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
  423                 (IPV6_VERSION & IPV6_VERSION_MASK);
  424         /* ip6_plen will be filled in ip6_output, so not fill it here. */
  425         ip6->ip6_nxt = in6p->in6p_ip6_nxt;
  426         ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
  427 
  428         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
  429             in6p->in6p_cksum != -1) {
  430                 struct mbuf *n;
  431                 int off;
  432                 u_int16_t *p;
  433 
  434                 /* compute checksum */
  435                 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
  436                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
  437                 else
  438                         off = in6p->in6p_cksum;
  439                 if (plen < off + 1) {
  440                         error = EINVAL;
  441                         goto bad;
  442                 }
  443                 off += sizeof(struct ip6_hdr);
  444 
  445                 n = m;
  446                 while (n && n->m_len <= off) {
  447                         off -= n->m_len;
  448                         n = n->m_next;
  449                 }
  450                 if (!n)
  451                         goto bad;
  452                 p = (u_int16_t *)(mtod(n, caddr_t) + off);
  453                 *p = 0;
  454                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
  455         }
  456 
  457         error = ip6_output(m, optp, NULL, 0, in6p->in6p_moptions, &oifp, in6p);
  458         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  459                 if (oifp)
  460                         icmp6_ifoutstat_inc(oifp, type, code);
  461                 icmp6stat.icp6s_outhist[type]++;
  462         } else
  463                 rip6stat.rip6s_opackets++;
  464 
  465         goto freectl;
  466 
  467  bad:
  468         if (m)
  469                 m_freem(m);
  470 
  471  freectl:
  472         if (control) {
  473                 ip6_clearpktopts(&opt, -1);
  474                 m_freem(control);
  475         }
  476         INP_UNLOCK(in6p);
  477         return (error);
  478 }
  479 
  480 /*
  481  * Raw IPv6 socket option processing.
  482  */
  483 int
  484 rip6_ctloutput(so, sopt)
  485         struct socket *so;
  486         struct sockopt *sopt;
  487 {
  488         int error;
  489 
  490         if (sopt->sopt_level == IPPROTO_ICMPV6)
  491                 /*
  492                  * XXX: is it better to call icmp6_ctloutput() directly
  493                  * from protosw?
  494                  */
  495                 return (icmp6_ctloutput(so, sopt));
  496         else if (sopt->sopt_level != IPPROTO_IPV6)
  497                 return (EINVAL);
  498 
  499         error = 0;
  500 
  501         switch (sopt->sopt_dir) {
  502         case SOPT_GET:
  503                 switch (sopt->sopt_name) {
  504                 case MRT6_INIT:
  505                 case MRT6_DONE:
  506                 case MRT6_ADD_MIF:
  507                 case MRT6_DEL_MIF:
  508                 case MRT6_ADD_MFC:
  509                 case MRT6_DEL_MFC:
  510                 case MRT6_PIM:
  511                         error = ip6_mrouter_get(so, sopt);
  512                         break;
  513                 case IPV6_CHECKSUM:
  514                         error = ip6_raw_ctloutput(so, sopt);
  515                         break;
  516                 default:
  517                         error = ip6_ctloutput(so, sopt);
  518                         break;
  519                 }
  520                 break;
  521 
  522         case SOPT_SET:
  523                 switch (sopt->sopt_name) {
  524                 case MRT6_INIT:
  525                 case MRT6_DONE:
  526                 case MRT6_ADD_MIF:
  527                 case MRT6_DEL_MIF:
  528                 case MRT6_ADD_MFC:
  529                 case MRT6_DEL_MFC:
  530                 case MRT6_PIM:
  531                         error = ip6_mrouter_set(so, sopt);
  532                         break;
  533                 case IPV6_CHECKSUM:
  534                         error = ip6_raw_ctloutput(so, sopt);
  535                         break;
  536                 default:
  537                         error = ip6_ctloutput(so, sopt);
  538                         break;
  539                 }
  540                 break;
  541         }
  542 
  543         return (error);
  544 }
  545 
  546 static int
  547 rip6_attach(struct socket *so, int proto, struct thread *td)
  548 {
  549         struct inpcb *inp;
  550         struct icmp6_filter *filter;
  551         int error, s;
  552 
  553         INP_INFO_WLOCK(&ripcbinfo);
  554         inp = sotoinpcb(so);
  555         if (inp) {
  556                 INP_INFO_WUNLOCK(&ripcbinfo);
  557                 panic("rip6_attach");
  558         }
  559         if (td && (error = suser(td)) != 0) {
  560                 INP_INFO_WUNLOCK(&ripcbinfo);
  561                 return error;
  562         }
  563         error = soreserve(so, rip_sendspace, rip_recvspace);
  564         if (error) {
  565                 INP_INFO_WUNLOCK(&ripcbinfo);
  566                 return error;
  567         }
  568         MALLOC(filter, struct icmp6_filter *,
  569                sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
  570         if (filter == NULL) {
  571                 INP_INFO_WUNLOCK(&ripcbinfo);
  572                 return ENOMEM;
  573         }
  574         s = splnet();
  575         error = in_pcballoc(so, &ripcbinfo);
  576         splx(s);
  577         if (error) {
  578                 INP_INFO_WUNLOCK(&ripcbinfo);
  579                 FREE(filter, M_PCB);
  580                 return error;
  581         }
  582         inp = (struct inpcb *)so->so_pcb;
  583         INP_INFO_WUNLOCK(&ripcbinfo);
  584         inp->inp_vflag |= INP_IPV6;
  585         inp->in6p_ip6_nxt = (long)proto;
  586         inp->in6p_hops = -1;    /* use kernel default */
  587         inp->in6p_cksum = -1;
  588         inp->in6p_icmp6filt = filter;
  589         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
  590         INP_UNLOCK(inp);
  591         return 0;
  592 }
  593 
  594 static int
  595 rip6_detach(struct socket *so)
  596 {
  597         struct inpcb *inp;
  598 
  599         INP_INFO_WLOCK(&ripcbinfo);
  600         inp = sotoinpcb(so);
  601         if (inp == 0) {
  602                 INP_INFO_WUNLOCK(&ripcbinfo);
  603                 panic("rip6_detach");
  604         }
  605         /* xxx: RSVP */
  606         if (so == ip6_mrouter)
  607                 ip6_mrouter_done();
  608         if (inp->in6p_icmp6filt) {
  609                 FREE(inp->in6p_icmp6filt, M_PCB);
  610                 inp->in6p_icmp6filt = NULL;
  611         }
  612         INP_LOCK(inp);
  613         in6_pcbdetach(inp);
  614         INP_INFO_WUNLOCK(&ripcbinfo);
  615         return 0;
  616 }
  617 
  618 static int
  619 rip6_abort(struct socket *so)
  620 {
  621         soisdisconnected(so);
  622         return rip6_detach(so);
  623 }
  624 
  625 static int
  626 rip6_disconnect(struct socket *so)
  627 {
  628         struct inpcb *inp = sotoinpcb(so);
  629 
  630         if ((so->so_state & SS_ISCONNECTED) == 0)
  631                 return ENOTCONN;
  632         inp->in6p_faddr = in6addr_any;
  633         return rip6_abort(so);
  634 }
  635 
  636 static int
  637 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  638 {
  639         struct inpcb *inp = sotoinpcb(so);
  640         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  641         struct ifaddr *ia = NULL;
  642         int error = 0;
  643 
  644         if (nam->sa_len != sizeof(*addr))
  645                 return EINVAL;
  646         if (TAILQ_EMPTY(&ifnet) || addr->sin6_family != AF_INET6)
  647                 return EADDRNOTAVAIL;
  648         if ((error = sa6_embedscope(addr, ip6_use_defzone)) != 0)
  649                 return(error);
  650 
  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_INFO_WLOCK(&ripcbinfo);
  661         INP_LOCK(inp);
  662         inp->in6p_laddr = addr->sin6_addr;
  663         INP_UNLOCK(inp);
  664         INP_INFO_WUNLOCK(&ripcbinfo);
  665         return 0;
  666 }
  667 
  668 static int
  669 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  670 {
  671         struct inpcb *inp = sotoinpcb(so);
  672         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  673         struct in6_addr *in6a = NULL;
  674         struct ifnet *ifp = NULL;
  675         int error = 0, scope_ambiguous = 0;
  676 
  677         if (nam->sa_len != sizeof(*addr))
  678                 return EINVAL;
  679         if (TAILQ_EMPTY(&ifnet))
  680                 return EADDRNOTAVAIL;
  681         if (addr->sin6_family != AF_INET6)
  682                 return EAFNOSUPPORT;
  683 
  684         /*
  685          * Application should provide a proper zone ID or the use of
  686          * default zone IDs should be enabled.  Unfortunately, some
  687          * applications do not behave as it should, so we need a
  688          * workaround.  Even if an appropriate ID is not determined,
  689          * we'll see if we can determine the outgoing interface.  If we
  690          * can, determine the zone ID based on the interface below.
  691          */
  692         if (addr->sin6_scope_id == 0 && !ip6_use_defzone)
  693                 scope_ambiguous = 1;
  694         if ((error = sa6_embedscope(addr, ip6_use_defzone)) != 0)
  695                 return(error);
  696 
  697         INP_INFO_WLOCK(&ripcbinfo);
  698         INP_LOCK(inp);
  699         /* Source address selection. XXX: need pcblookup? */
  700         in6a = in6_selectsrc(addr, inp->in6p_outputopts,
  701                              inp->in6p_moptions, NULL,
  702                              &inp->in6p_laddr, &ifp, &error);
  703         if (in6a == NULL) {
  704                 INP_UNLOCK(inp);
  705                 INP_INFO_WUNLOCK(&ripcbinfo);
  706                 return (error ? error : EADDRNOTAVAIL);
  707         }
  708 
  709         /* XXX: see above */
  710         if (ifp && scope_ambiguous &&
  711             (error = in6_setscope(&addr->sin6_addr, ifp, NULL)) != 0) {
  712                 INP_UNLOCK(inp);
  713                 INP_INFO_WUNLOCK(&ripcbinfo);
  714                 return(error);
  715         }
  716         inp->in6p_faddr = addr->sin6_addr;
  717         inp->in6p_laddr = *in6a;
  718         soisconnected(so);
  719         INP_UNLOCK(inp);
  720         INP_INFO_WUNLOCK(&ripcbinfo);
  721         return 0;
  722 }
  723 
  724 static int
  725 rip6_shutdown(struct socket *so)
  726 {
  727         struct inpcb *inp;
  728 
  729         INP_INFO_RLOCK(&ripcbinfo);
  730         inp = sotoinpcb(so);
  731         INP_LOCK(inp);
  732         INP_INFO_RUNLOCK(&ripcbinfo);
  733         socantsendmore(so);
  734         INP_UNLOCK(inp);
  735         return 0;
  736 }
  737 
  738 static int
  739 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  740          struct mbuf *control, struct thread *td)
  741 {
  742         struct inpcb *inp = sotoinpcb(so);
  743         struct sockaddr_in6 tmp;
  744         struct sockaddr_in6 *dst;
  745         int ret;
  746 
  747         INP_INFO_WLOCK(&ripcbinfo);
  748         /* always copy sockaddr to avoid overwrites */
  749         /* Unlocked read. */
  750         if (so->so_state & SS_ISCONNECTED) {
  751                 if (nam) {
  752                         INP_INFO_WUNLOCK(&ripcbinfo);
  753                         m_freem(m);
  754                         return EISCONN;
  755                 }
  756                 /* XXX */
  757                 bzero(&tmp, sizeof(tmp));
  758                 tmp.sin6_family = AF_INET6;
  759                 tmp.sin6_len = sizeof(struct sockaddr_in6);
  760                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
  761                       sizeof(struct in6_addr));
  762                 dst = &tmp;
  763         } else {
  764                 if (nam == NULL) {
  765                         INP_INFO_WUNLOCK(&ripcbinfo);
  766                         m_freem(m);
  767                         return ENOTCONN;
  768                 }
  769                 if (nam->sa_len != sizeof(struct sockaddr_in6)) {
  770                         INP_INFO_WUNLOCK(&ripcbinfo);
  771                         m_freem(m);
  772                         return(EINVAL);
  773                 }
  774                 tmp = *(struct sockaddr_in6 *)nam;
  775                 dst = &tmp;
  776 
  777                 if (dst->sin6_family == AF_UNSPEC) {
  778                         /*
  779                          * XXX: we allow this case for backward
  780                          * compatibility to buggy applications that
  781                          * rely on old (and wrong) kernel behavior.
  782                          */
  783                         log(LOG_INFO, "rip6 SEND: address family is "
  784                             "unspec. Assume AF_INET6\n");
  785                         dst->sin6_family = AF_INET6;
  786                 } else if (dst->sin6_family != AF_INET6) {
  787                         INP_INFO_WUNLOCK(&ripcbinfo);
  788                         m_freem(m);
  789                         return(EAFNOSUPPORT);
  790                 }
  791         }
  792         ret = rip6_output(m, so, dst, control);
  793         INP_INFO_WUNLOCK(&ripcbinfo);
  794         return (ret);
  795 }
  796 
  797 struct pr_usrreqs rip6_usrreqs = {
  798         .pru_abort =            rip6_abort,
  799         .pru_attach =           rip6_attach,
  800         .pru_bind =             rip6_bind,
  801         .pru_connect =          rip6_connect,
  802         .pru_control =          in6_control,
  803         .pru_detach =           rip6_detach,
  804         .pru_disconnect =       rip6_disconnect,
  805         .pru_peeraddr =         in6_setpeeraddr,
  806         .pru_send =             rip6_send,
  807         .pru_shutdown =         rip6_shutdown,
  808         .pru_sockaddr =         in6_setsockaddr,
  809 };

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