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 
   30 /*-
   31  * Copyright (c) 1982, 1986, 1988, 1993
   32  *      The Regents of the University of California.
   33  * All rights reserved.
   34  *
   35  * Redistribution and use in source and binary forms, with or without
   36  * modification, are permitted provided that the following conditions
   37  * are met:
   38  * 1. Redistributions of source code must retain the above copyright
   39  *    notice, this list of conditions and the following disclaimer.
   40  * 2. Redistributions in binary form must reproduce the above copyright
   41  *    notice, this list of conditions and the following disclaimer in the
   42  *    documentation and/or other materials provided with the distribution.
   43  * 4. Neither the name of the University nor the names of its contributors
   44  *    may be used to endorse or promote products derived from this software
   45  *    without specific prior written permission.
   46  *
   47  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   48  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   49  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   50  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   51  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   52  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   53  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   54  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   55  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   56  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   57  * SUCH DAMAGE.
   58  *
   59  *      @(#)raw_ip.c    8.2 (Berkeley) 1/4/94
   60  */
   61 
   62 #include <sys/cdefs.h>
   63 __FBSDID("$FreeBSD: stable/7/sys/netinet6/raw_ip6.c 202914 2010-01-24 10:08:54Z bz $");
   64 
   65 #include "opt_ipsec.h"
   66 #include "opt_inet6.h"
   67 
   68 #include <sys/param.h>
   69 #include <sys/errno.h>
   70 #include <sys/jail.h>
   71 #include <sys/lock.h>
   72 #include <sys/malloc.h>
   73 #include <sys/mbuf.h>
   74 #include <sys/priv.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/syslog.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 #include <netinet6/scope6_var.h>
  100 
  101 #ifdef IPSEC
  102 #include <netipsec/ipsec.h>
  103 #include <netipsec/ipsec6.h>
  104 #endif /* IPSEC */
  105 
  106 #include <machine/stdarg.h>
  107 
  108 #define satosin6(sa)    ((struct sockaddr_in6 *)(sa))
  109 #define ifatoia6(ifa)   ((struct in6_ifaddr *)(ifa))
  110 
  111 /*
  112  * Raw interface to IP6 protocol.
  113  */
  114 
  115 extern struct   inpcbhead ripcb;
  116 extern struct   inpcbinfo ripcbinfo;
  117 extern u_long   rip_sendspace;
  118 extern u_long   rip_recvspace;
  119 
  120 struct rip6stat rip6stat;
  121 
  122 /*
  123  * Hooks for multicast forwarding.
  124  */
  125 struct socket *ip6_mrouter = NULL;
  126 int (*ip6_mrouter_set)(struct socket *, struct sockopt *);
  127 int (*ip6_mrouter_get)(struct socket *, struct sockopt *);
  128 int (*ip6_mrouter_done)(void);
  129 int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *);
  130 int (*mrt6_ioctl)(int, caddr_t);
  131 
  132 /*
  133  * Setup generic address and protocol structures for raw_input routine, then
  134  * pass them along with mbuf chain.
  135  */
  136 int
  137 rip6_input(struct mbuf **mp, int *offp, int 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         INP_INFO_RLOCK(&ripcbinfo);
  157         LIST_FOREACH(in6p, &ripcb, inp_list) {
  158                 /* XXX inp locking */
  159                 if ((in6p->inp_vflag & INP_IPV6) == 0)
  160                         continue;
  161                 if (in6p->inp_ip_p &&
  162                     in6p->inp_ip_p != proto)
  163                         continue;
  164                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
  165                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
  166                         continue;
  167                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
  168                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
  169                         continue;
  170                 if (prison_check_ip6(in6p->inp_cred, &ip6->ip6_dst) != 0)
  171                         continue;
  172                 INP_RLOCK(in6p);
  173                 if (in6p->in6p_cksum != -1) {
  174                         rip6stat.rip6s_isum++;
  175                         if (in6_cksum(m, proto, *offp,
  176                             m->m_pkthdr.len - *offp)) {
  177                                 INP_RUNLOCK(in6p);
  178                                 rip6stat.rip6s_badsum++;
  179                                 continue;
  180                         }
  181                 }
  182                 if (last) {
  183                         struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
  184 
  185 #ifdef IPSEC
  186                         /*
  187                          * Check AH/ESP integrity.
  188                          */
  189                         if (n && ipsec6_in_reject(n, last)) {
  190                                 m_freem(n);
  191                                 ipsec6stat.in_polvio++;
  192                                 /* Do not inject data into pcb. */
  193                         } else
  194 #endif /* IPSEC */
  195                         if (n) {
  196                                 if (last->inp_flags & INP_CONTROLOPTS ||
  197                                     last->inp_socket->so_options & SO_TIMESTAMP)
  198                                         ip6_savecontrol(last, n, &opts);
  199                                 /* strip intermediate headers */
  200                                 m_adj(n, *offp);
  201                                 if (sbappendaddr(&last->inp_socket->so_rcv,
  202                                                 (struct sockaddr *)&fromsa,
  203                                                  n, opts) == 0) {
  204                                         m_freem(n);
  205                                         if (opts)
  206                                                 m_freem(opts);
  207                                         rip6stat.rip6s_fullsock++;
  208                                 } else
  209                                         sorwakeup(last->inp_socket);
  210                                 opts = NULL;
  211                         }
  212                         INP_RUNLOCK(last);
  213                 }
  214                 last = in6p;
  215         }
  216         INP_INFO_RUNLOCK(&ripcbinfo);
  217 #ifdef IPSEC
  218         /*
  219          * Check AH/ESP integrity.
  220          */
  221         if (last && ipsec6_in_reject(m, last)) {
  222                 m_freem(m);
  223                 ipsec6stat.in_polvio++;
  224                 ip6stat.ip6s_delivered--;
  225                 /* Do not inject data into pcb. */
  226                 INP_RUNLOCK(last);
  227         } else
  228 #endif /* IPSEC */
  229         if (last) {
  230                 if (last->inp_flags & INP_CONTROLOPTS ||
  231                     last->inp_socket->so_options & SO_TIMESTAMP)
  232                         ip6_savecontrol(last, m, &opts);
  233                 /* Strip intermediate headers. */
  234                 m_adj(m, *offp);
  235                 if (sbappendaddr(&last->inp_socket->so_rcv,
  236                     (struct sockaddr *)&fromsa, m, opts) == 0) {
  237                         m_freem(m);
  238                         if (opts)
  239                                 m_freem(opts);
  240                         rip6stat.rip6s_fullsock++;
  241                 } else
  242                         sorwakeup(last->inp_socket);
  243                 INP_RUNLOCK(last);
  244         } else {
  245                 rip6stat.rip6s_nosock++;
  246                 if (m->m_flags & M_MCAST)
  247                         rip6stat.rip6s_nosockmcast++;
  248                 if (proto == IPPROTO_NONE)
  249                         m_freem(m);
  250                 else {
  251                         char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
  252                         icmp6_error(m, ICMP6_PARAM_PROB,
  253                             ICMP6_PARAMPROB_NEXTHEADER,
  254                             prvnxtp - mtod(m, char *));
  255                 }
  256                 ip6stat.ip6s_delivered--;
  257         }
  258         return (IPPROTO_DONE);
  259 }
  260 
  261 void
  262 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d)
  263 {
  264         struct ip6_hdr *ip6;
  265         struct mbuf *m;
  266         int off = 0;
  267         struct ip6ctlparam *ip6cp = NULL;
  268         const struct sockaddr_in6 *sa6_src = NULL;
  269         void *cmdarg;
  270         struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange;
  271 
  272         if (sa->sa_family != AF_INET6 ||
  273             sa->sa_len != sizeof(struct sockaddr_in6))
  274                 return;
  275 
  276         if ((unsigned)cmd >= PRC_NCMDS)
  277                 return;
  278         if (PRC_IS_REDIRECT(cmd))
  279                 notify = in6_rtchange, d = NULL;
  280         else if (cmd == PRC_HOSTDEAD)
  281                 d = NULL;
  282         else if (inet6ctlerrmap[cmd] == 0)
  283                 return;
  284 
  285         /*
  286          * If the parameter is from icmp6, decode it.
  287          */
  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, 0, cmd, cmdarg, notify);
  304 }
  305 
  306 /*
  307  * Generate IPv6 header and pass packet to ip6_output.  Tack on options user
  308  * may have setup with control call.
  309  */
  310 int
  311 #if __STDC__
  312 rip6_output(struct mbuf *m, ...)
  313 #else
  314 rip6_output(m, va_alist)
  315         struct mbuf *m;
  316         va_dcl
  317 #endif
  318 {
  319         struct mbuf *control;
  320         struct socket *so;
  321         struct sockaddr_in6 *dstsock;
  322         struct in6_addr *dst;
  323         struct ip6_hdr *ip6;
  324         struct inpcb *in6p;
  325         u_int   plen = m->m_pkthdr.len;
  326         int error = 0;
  327         struct ip6_pktopts opt, *optp;
  328         struct ifnet *oifp = NULL;
  329         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
  330         int scope_ambiguous = 0;
  331         struct in6_addr in6a;
  332         va_list ap;
  333 
  334         va_start(ap, m);
  335         so = va_arg(ap, struct socket *);
  336         dstsock = va_arg(ap, struct sockaddr_in6 *);
  337         control = va_arg(ap, struct mbuf *);
  338         va_end(ap);
  339 
  340         in6p = sotoinpcb(so);
  341         INP_WLOCK(in6p);
  342 
  343         dst = &dstsock->sin6_addr;
  344         if (control) {
  345                 if ((error = ip6_setpktopts(control, &opt,
  346                     in6p->in6p_outputopts, so->so_cred,
  347                     so->so_proto->pr_protocol)) != 0) {
  348                         goto bad;
  349                 }
  350                 optp = &opt;
  351         } else
  352                 optp = in6p->in6p_outputopts;
  353 
  354         /*
  355          * Check and convert scope zone ID into internal form.
  356          *
  357          * XXX: we may still need to determine the zone later.
  358          */
  359         if (!(so->so_state & SS_ISCONNECTED)) {
  360                 if (dstsock->sin6_scope_id == 0 && !ip6_use_defzone)
  361                         scope_ambiguous = 1;
  362                 if ((error = sa6_embedscope(dstsock, ip6_use_defzone)) != 0)
  363                         goto bad;
  364         }
  365 
  366         /*
  367          * For an ICMPv6 packet, we should know its type and code to update
  368          * statistics.
  369          */
  370         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  371                 struct icmp6_hdr *icmp6;
  372                 if (m->m_len < sizeof(struct icmp6_hdr) &&
  373                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
  374                         error = ENOBUFS;
  375                         goto bad;
  376                 }
  377                 icmp6 = mtod(m, struct icmp6_hdr *);
  378                 type = icmp6->icmp6_type;
  379                 code = icmp6->icmp6_code;
  380         }
  381 
  382         M_PREPEND(m, sizeof(*ip6), M_DONTWAIT);
  383         if (m == NULL) {
  384                 error = ENOBUFS;
  385                 goto bad;
  386         }
  387         ip6 = mtod(m, struct ip6_hdr *);
  388 
  389         /*
  390          * Source address selection.
  391          */
  392         error = in6_selectsrc(dstsock, optp, in6p, NULL, so->so_cred,
  393             &oifp, &in6a);
  394         if (error)
  395                 goto bad;
  396         error = prison_get_ip6(in6p->inp_cred, &in6a);
  397         if (error != 0)
  398                 goto bad;
  399         ip6->ip6_src = in6a;
  400 
  401         if (oifp && scope_ambiguous) {
  402                 /*
  403                  * Application should provide a proper zone ID or the use of
  404                  * default zone IDs should be enabled.  Unfortunately, some
  405                  * applications do not behave as it should, so we need a
  406                  * workaround.  Even if an appropriate ID is not determined
  407                  * (when it's required), if we can determine the outgoing
  408                  * interface. determine the zone ID based on the interface.
  409                  */
  410                 error = in6_setscope(&dstsock->sin6_addr, oifp, NULL);
  411                 if (error != 0)
  412                         goto bad;
  413         }
  414         ip6->ip6_dst = dstsock->sin6_addr;
  415 
  416         /*
  417          * Fill in the rest of the IPv6 header fields.
  418          */
  419         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
  420             (in6p->inp_flow & IPV6_FLOWINFO_MASK);
  421         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
  422             (IPV6_VERSION & IPV6_VERSION_MASK);
  423 
  424         /*
  425          * ip6_plen will be filled in ip6_output, so not fill it here.
  426          */
  427         ip6->ip6_nxt = in6p->inp_ip_p;
  428         ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
  429 
  430         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
  431             in6p->in6p_cksum != -1) {
  432                 struct mbuf *n;
  433                 int off;
  434                 u_int16_t *p;
  435 
  436                 /* Compute checksum. */
  437                 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
  438                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
  439                 else
  440                         off = in6p->in6p_cksum;
  441                 if (plen < off + 1) {
  442                         error = EINVAL;
  443                         goto bad;
  444                 }
  445                 off += sizeof(struct ip6_hdr);
  446 
  447                 n = m;
  448                 while (n && n->m_len <= off) {
  449                         off -= n->m_len;
  450                         n = n->m_next;
  451                 }
  452                 if (!n)
  453                         goto bad;
  454                 p = (u_int16_t *)(mtod(n, caddr_t) + off);
  455                 *p = 0;
  456                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
  457         }
  458 
  459         error = ip6_output(m, optp, NULL, 0, in6p->in6p_moptions, &oifp, in6p);
  460         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  461                 if (oifp)
  462                         icmp6_ifoutstat_inc(oifp, type, code);
  463                 icmp6stat.icp6s_outhist[type]++;
  464         } else
  465                 rip6stat.rip6s_opackets++;
  466 
  467         goto freectl;
  468 
  469  bad:
  470         if (m)
  471                 m_freem(m);
  472 
  473  freectl:
  474         if (control) {
  475                 ip6_clearpktopts(&opt, -1);
  476                 m_freem(control);
  477         }
  478         INP_WUNLOCK(in6p);
  479         return (error);
  480 }
  481 
  482 /*
  483  * Raw IPv6 socket option processing.
  484  */
  485 int
  486 rip6_ctloutput(struct socket *so, 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 ?  ip6_mrouter_get(so, sopt) :
  512                             EOPNOTSUPP;
  513                         break;
  514                 case IPV6_CHECKSUM:
  515                         error = ip6_raw_ctloutput(so, sopt);
  516                         break;
  517                 default:
  518                         error = ip6_ctloutput(so, sopt);
  519                         break;
  520                 }
  521                 break;
  522 
  523         case SOPT_SET:
  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_set ?  ip6_mrouter_set(so, sopt) :
  533                             EOPNOTSUPP;
  534                         break;
  535                 case IPV6_CHECKSUM:
  536                         error = ip6_raw_ctloutput(so, sopt);
  537                         break;
  538                 default:
  539                         error = ip6_ctloutput(so, sopt);
  540                         break;
  541                 }
  542                 break;
  543         }
  544 
  545         return (error);
  546 }
  547 
  548 static int
  549 rip6_attach(struct socket *so, int proto, struct thread *td)
  550 {
  551         struct inpcb *inp;
  552         struct icmp6_filter *filter;
  553         int error;
  554 
  555         inp = sotoinpcb(so);
  556         KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
  557 
  558         error = priv_check(td, PRIV_NETINET_RAW);
  559         if (error)
  560                 return (error);
  561         error = soreserve(so, rip_sendspace, rip_recvspace);
  562         if (error)
  563                 return (error);
  564         MALLOC(filter, struct icmp6_filter *,
  565                sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
  566         if (filter == NULL)
  567                 return (ENOMEM);
  568         INP_INFO_WLOCK(&ripcbinfo);
  569         error = in_pcballoc(so, &ripcbinfo);
  570         if (error) {
  571                 INP_INFO_WUNLOCK(&ripcbinfo);
  572                 FREE(filter, M_PCB);
  573                 return (error);
  574         }
  575         inp = (struct inpcb *)so->so_pcb;
  576         INP_INFO_WUNLOCK(&ripcbinfo);
  577         inp->inp_vflag |= INP_IPV6;
  578         inp->inp_ip_p = (long)proto;
  579         inp->in6p_hops = -1;    /* use kernel default */
  580         inp->in6p_cksum = -1;
  581         inp->in6p_icmp6filt = filter;
  582         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
  583         INP_WUNLOCK(inp);
  584         return (0);
  585 }
  586 
  587 static void
  588 rip6_detach(struct socket *so)
  589 {
  590         struct inpcb *inp;
  591 
  592         inp = sotoinpcb(so);
  593         KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
  594 
  595         if (so == ip6_mrouter && ip6_mrouter_done)
  596                 ip6_mrouter_done();
  597         /* xxx: RSVP */
  598         INP_INFO_WLOCK(&ripcbinfo);
  599         INP_WLOCK(inp);
  600         FREE(inp->in6p_icmp6filt, M_PCB);
  601         in_pcbdetach(inp);
  602         in_pcbfree(inp);
  603         INP_INFO_WUNLOCK(&ripcbinfo);
  604 }
  605 
  606 /* XXXRW: This can't ever be called. */
  607 static void
  608 rip6_abort(struct socket *so)
  609 {
  610         struct inpcb *inp;
  611 
  612         inp = sotoinpcb(so);
  613         KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
  614 
  615         soisdisconnected(so);
  616 }
  617 
  618 static void
  619 rip6_close(struct socket *so)
  620 {
  621         struct inpcb *inp;
  622 
  623         inp = sotoinpcb(so);
  624         KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
  625 
  626         soisdisconnected(so);
  627 }
  628 
  629 static int
  630 rip6_disconnect(struct socket *so)
  631 {
  632         struct inpcb *inp;
  633 
  634         inp = sotoinpcb(so);
  635         KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
  636 
  637         if ((so->so_state & SS_ISCONNECTED) == 0)
  638                 return (ENOTCONN);
  639         inp->in6p_faddr = in6addr_any;
  640         rip6_abort(so);
  641         return (0);
  642 }
  643 
  644 static int
  645 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  646 {
  647         struct inpcb *inp;
  648         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  649         struct ifaddr *ia = NULL;
  650         int error = 0;
  651 
  652         inp = sotoinpcb(so);
  653         KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
  654 
  655         if (nam->sa_len != sizeof(*addr))
  656                 return (EINVAL);
  657         if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
  658                 return (error);
  659         if (TAILQ_EMPTY(&ifnet) || addr->sin6_family != AF_INET6)
  660                 return (EADDRNOTAVAIL);
  661         if ((error = sa6_embedscope(addr, ip6_use_defzone)) != 0)
  662                 return (error);
  663 
  664         if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
  665             (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0)
  666                 return (EADDRNOTAVAIL);
  667         if (ia &&
  668             ((struct in6_ifaddr *)ia)->ia6_flags &
  669             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
  670              IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
  671                 return (EADDRNOTAVAIL);
  672         }
  673         INP_INFO_WLOCK(&ripcbinfo);
  674         INP_WLOCK(inp);
  675         inp->in6p_laddr = addr->sin6_addr;
  676         INP_WUNLOCK(inp);
  677         INP_INFO_WUNLOCK(&ripcbinfo);
  678         return (0);
  679 }
  680 
  681 static int
  682 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  683 {
  684         struct inpcb *inp;
  685         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  686         struct in6_addr in6a;
  687         struct ifnet *ifp = NULL;
  688         int error = 0, scope_ambiguous = 0;
  689 
  690         inp = sotoinpcb(so);
  691         KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
  692 
  693         if (nam->sa_len != sizeof(*addr))
  694                 return (EINVAL);
  695         if (TAILQ_EMPTY(&ifnet))
  696                 return (EADDRNOTAVAIL);
  697         if (addr->sin6_family != AF_INET6)
  698                 return (EAFNOSUPPORT);
  699 
  700         /*
  701          * Application should provide a proper zone ID or the use of default
  702          * zone IDs should be enabled.  Unfortunately, some applications do
  703          * not behave as it should, so we need a workaround.  Even if an
  704          * appropriate ID is not determined, we'll see if we can determine
  705          * the outgoing interface.  If we can, determine the zone ID based on
  706          * the interface below.
  707          */
  708         if (addr->sin6_scope_id == 0 && !ip6_use_defzone)
  709                 scope_ambiguous = 1;
  710         if ((error = sa6_embedscope(addr, ip6_use_defzone)) != 0)
  711                 return (error);
  712 
  713         INP_INFO_WLOCK(&ripcbinfo);
  714         INP_WLOCK(inp);
  715         /* Source address selection. XXX: need pcblookup? */
  716         error = in6_selectsrc(addr, inp->in6p_outputopts,
  717             inp, NULL, so->so_cred, &ifp, &in6a);
  718         if (error) {
  719                 INP_WUNLOCK(inp);
  720                 INP_INFO_WUNLOCK(&ripcbinfo);
  721                 return (error);
  722         }
  723 
  724         /* XXX: see above */
  725         if (ifp && scope_ambiguous &&
  726             (error = in6_setscope(&addr->sin6_addr, ifp, NULL)) != 0) {
  727                 INP_WUNLOCK(inp);
  728                 INP_INFO_WUNLOCK(&ripcbinfo);
  729                 return (error);
  730         }
  731         inp->in6p_faddr = addr->sin6_addr;
  732         inp->in6p_laddr = in6a;
  733         soisconnected(so);
  734         INP_WUNLOCK(inp);
  735         INP_INFO_WUNLOCK(&ripcbinfo);
  736         return (0);
  737 }
  738 
  739 static int
  740 rip6_shutdown(struct socket *so)
  741 {
  742         struct inpcb *inp;
  743 
  744         inp = sotoinpcb(so);
  745         KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL"));
  746 
  747         INP_WLOCK(inp);
  748         socantsendmore(so);
  749         INP_WUNLOCK(inp);
  750         return (0);
  751 }
  752 
  753 static int
  754 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  755     struct mbuf *control, struct thread *td)
  756 {
  757         struct inpcb *inp;
  758         struct sockaddr_in6 tmp;
  759         struct sockaddr_in6 *dst;
  760         int ret;
  761 
  762         inp = sotoinpcb(so);
  763         KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
  764 
  765         /* Always copy sockaddr to avoid overwrites. */
  766         /* Unlocked read. */
  767         if (so->so_state & SS_ISCONNECTED) {
  768                 if (nam) {
  769                         m_freem(m);
  770                         return (EISCONN);
  771                 }
  772                 /* XXX */
  773                 bzero(&tmp, sizeof(tmp));
  774                 tmp.sin6_family = AF_INET6;
  775                 tmp.sin6_len = sizeof(struct sockaddr_in6);
  776                 INP_RLOCK(inp);
  777                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
  778                     sizeof(struct in6_addr));
  779                 INP_RUNLOCK(inp);
  780                 dst = &tmp;
  781         } else {
  782                 if (nam == NULL) {
  783                         m_freem(m);
  784                         return (ENOTCONN);
  785                 }
  786                 if (nam->sa_len != sizeof(struct sockaddr_in6)) {
  787                         m_freem(m);
  788                         return (EINVAL);
  789                 }
  790                 tmp = *(struct sockaddr_in6 *)nam;
  791                 dst = &tmp;
  792 
  793                 if (dst->sin6_family == AF_UNSPEC) {
  794                         /*
  795                          * XXX: we allow this case for backward
  796                          * compatibility to buggy applications that
  797                          * rely on old (and wrong) kernel behavior.
  798                          */
  799                         log(LOG_INFO, "rip6 SEND: address family is "
  800                             "unspec. Assume AF_INET6\n");
  801                         dst->sin6_family = AF_INET6;
  802                 } else if (dst->sin6_family != AF_INET6) {
  803                         m_freem(m);
  804                         return(EAFNOSUPPORT);
  805                 }
  806         }
  807         ret = rip6_output(m, so, dst, control);
  808         return (ret);
  809 }
  810 
  811 struct pr_usrreqs rip6_usrreqs = {
  812         .pru_abort =            rip6_abort,
  813         .pru_attach =           rip6_attach,
  814         .pru_bind =             rip6_bind,
  815         .pru_connect =          rip6_connect,
  816         .pru_control =          in6_control,
  817         .pru_detach =           rip6_detach,
  818         .pru_disconnect =       rip6_disconnect,
  819         .pru_peeraddr =         in6_getpeeraddr,
  820         .pru_send =             rip6_send,
  821         .pru_shutdown =         rip6_shutdown,
  822         .pru_sockaddr =         in6_getsockaddr,
  823         .pru_close =            rip6_close,
  824 };

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