The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/raw_ip6.c

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    1 /*
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/5.3/sys/netinet6/raw_ip6.c 136588 2004-10-16 08:43:07Z cvs2svn $
   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         } else
  225 #endif /*IPSEC || FAST_IPSEC*/
  226         if (last) {
  227                 if (last->in6p_flags & IN6P_CONTROLOPTS ||
  228                     last->in6p_socket->so_options & SO_TIMESTAMP)
  229                         ip6_savecontrol(last, m, &opts);
  230                 /* strip intermediate headers */
  231                 m_adj(m, *offp);
  232                 if (sbappendaddr(&last->in6p_socket->so_rcv,
  233                                 (struct sockaddr *)&fromsa, m, opts) == 0) {
  234                         m_freem(m);
  235                         if (opts)
  236                                 m_freem(opts);
  237                         rip6stat.rip6s_fullsock++;
  238                 } else
  239                         sorwakeup(last->in6p_socket);
  240                 INP_UNLOCK(last);
  241         } else {
  242                 rip6stat.rip6s_nosock++;
  243                 if (m->m_flags & M_MCAST)
  244                         rip6stat.rip6s_nosockmcast++;
  245                 if (proto == IPPROTO_NONE)
  246                         m_freem(m);
  247                 else {
  248                         char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
  249                         icmp6_error(m, ICMP6_PARAM_PROB,
  250                                     ICMP6_PARAMPROB_NEXTHEADER,
  251                                     prvnxtp - mtod(m, char *));
  252                 }
  253                 ip6stat.ip6s_delivered--;
  254         }
  255         INP_INFO_RUNLOCK(&ripcbinfo);
  256         return IPPROTO_DONE;
  257 }
  258 
  259 void
  260 rip6_ctlinput(cmd, sa, d)
  261         int cmd;
  262         struct sockaddr *sa;
  263         void *d;
  264 {
  265         struct ip6_hdr *ip6;
  266         struct mbuf *m;
  267         int off = 0;
  268         struct ip6ctlparam *ip6cp = NULL;
  269         const struct sockaddr_in6 *sa6_src = NULL;
  270         void *cmdarg;
  271         struct inpcb *(*notify) __P((struct inpcb *, int)) = in6_rtchange;
  272 
  273         if (sa->sa_family != AF_INET6 ||
  274             sa->sa_len != sizeof(struct sockaddr_in6))
  275                 return;
  276 
  277         if ((unsigned)cmd >= PRC_NCMDS)
  278                 return;
  279         if (PRC_IS_REDIRECT(cmd))
  280                 notify = in6_rtchange, d = NULL;
  281         else if (cmd == PRC_HOSTDEAD)
  282                 d = NULL;
  283         else if (inet6ctlerrmap[cmd] == 0)
  284                 return;
  285 
  286         /* if the parameter is from icmp6, decode it. */
  287         if (d != NULL) {
  288                 ip6cp = (struct ip6ctlparam *)d;
  289                 m = ip6cp->ip6c_m;
  290                 ip6 = ip6cp->ip6c_ip6;
  291                 off = ip6cp->ip6c_off;
  292                 cmdarg = ip6cp->ip6c_cmdarg;
  293                 sa6_src = ip6cp->ip6c_src;
  294         } else {
  295                 m = NULL;
  296                 ip6 = NULL;
  297                 cmdarg = NULL;
  298                 sa6_src = &sa6_any;
  299         }
  300 
  301         (void) in6_pcbnotify(&ripcbinfo, sa, 0,
  302                              (const struct sockaddr *)sa6_src,
  303                              0, cmd, cmdarg, notify);
  304 }
  305 
  306 /*
  307  * Generate IPv6 header and pass packet to ip6_output.
  308  * Tack on options user 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, *stickyopt = NULL;
  328         struct ifnet *oifp = NULL;
  329         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
  330         int priv = 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 = sotoin6pcb(so);
  341         /*
  342          * XXXRW: In IPv6, we don't start referencing the contents of the
  343          * inpcb until after all M_TRYWAIT allocations have finished.  We may
  344          * want to reorder this function to provide similar guarantees here,
  345          * so as to avoid holding a mutex over M_TRYWAIT.
  346          */
  347         INP_LOCK(in6p);
  348         stickyopt = in6p->in6p_outputopts;
  349 
  350         priv = 0;
  351         if (so->so_cred->cr_uid == 0)
  352                 priv = 1;
  353         dst = &dstsock->sin6_addr;
  354         if (control) {
  355                 if ((error = ip6_setpktoptions(control, &opt,
  356                                                stickyopt, priv, 0,
  357                                                so->so_proto->pr_protocol))
  358                     != 0) {
  359                         goto bad;
  360                 }
  361                 in6p->in6p_outputopts = &opt;
  362         }
  363 
  364         /*
  365          * For an ICMPv6 packet, we should know its type and code
  366          * to update statistics.
  367          */
  368         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  369                 struct icmp6_hdr *icmp6;
  370                 if (m->m_len < sizeof(struct icmp6_hdr) &&
  371                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
  372                         error = ENOBUFS;
  373                         goto bad;
  374                 }
  375                 icmp6 = mtod(m, struct icmp6_hdr *);
  376                 type = icmp6->icmp6_type;
  377                 code = icmp6->icmp6_code;
  378         }
  379 
  380         M_PREPEND(m, sizeof(*ip6), M_DONTWAIT);
  381         if (m == NULL) {
  382                 error = ENOBUFS;
  383                 goto bad;
  384         }
  385         ip6 = mtod(m, struct ip6_hdr *);
  386 
  387         /*
  388          * Next header might not be ICMP6 but use its pseudo header anyway.
  389          */
  390         ip6->ip6_dst = *dst;
  391 
  392         /*
  393          * If the scope of the destination is link-local, embed the interface
  394          * index in the address.
  395          *
  396          * XXX advanced-api value overrides sin6_scope_id
  397          */
  398         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
  399                 struct in6_pktinfo *pi;
  400 
  401                 /*
  402                  * XXX Boundary check is assumed to be already done in
  403                  * ip6_setpktoptions().
  404                  */
  405                 if (in6p->in6p_outputopts &&
  406                     (pi = in6p->in6p_outputopts->ip6po_pktinfo) &&
  407                     pi->ipi6_ifindex) {
  408                         ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
  409                         oifp = ifnet_byindex(pi->ipi6_ifindex);
  410                 } else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
  411                          in6p->in6p_moptions &&
  412                          in6p->in6p_moptions->im6o_multicast_ifp) {
  413                         oifp = in6p->in6p_moptions->im6o_multicast_ifp;
  414                         ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
  415                 } else if (dstsock->sin6_scope_id) {
  416                         /* boundary check */
  417                         if (dstsock->sin6_scope_id < 0 ||
  418                             if_index < dstsock->sin6_scope_id) {
  419                                 error = ENXIO;  /* XXX EINVAL? */
  420                                 goto bad;
  421                         }
  422                         ip6->ip6_dst.s6_addr16[1] =
  423                             htons(dstsock->sin6_scope_id & 0xffff); /* XXX */
  424                 }
  425         }
  426 
  427         /*
  428          * Source address selection.
  429          */
  430         if ((in6a = in6_selectsrc(dstsock, in6p->in6p_outputopts,
  431             in6p->in6p_moptions, NULL, &in6p->in6p_laddr, &error)) == 0) {
  432                 if (error == 0)
  433                         error = EADDRNOTAVAIL;
  434                 goto bad;
  435         }
  436         ip6->ip6_src = *in6a;
  437         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
  438                 (in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK);
  439         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
  440                 (IPV6_VERSION & IPV6_VERSION_MASK);
  441         /* ip6_plen will be filled in ip6_output, so not fill it here. */
  442         ip6->ip6_nxt = in6p->in6p_ip6_nxt;
  443         ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
  444 
  445         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
  446             in6p->in6p_cksum != -1) {
  447                 struct mbuf *n;
  448                 int off;
  449                 u_int16_t *p;
  450 
  451                 /* compute checksum */
  452                 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
  453                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
  454                 else
  455                         off = in6p->in6p_cksum;
  456                 if (plen < off + 1) {
  457                         error = EINVAL;
  458                         goto bad;
  459                 }
  460                 off += sizeof(struct ip6_hdr);
  461 
  462                 n = m;
  463                 while (n && n->m_len <= off) {
  464                         off -= n->m_len;
  465                         n = n->m_next;
  466                 }
  467                 if (!n)
  468                         goto bad;
  469                 p = (u_int16_t *)(mtod(n, caddr_t) + off);
  470                 *p = 0;
  471                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
  472         }
  473 
  474         error = ip6_output(m, in6p->in6p_outputopts, NULL, 0,
  475                            in6p->in6p_moptions, &oifp, in6p);
  476         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  477                 if (oifp)
  478                         icmp6_ifoutstat_inc(oifp, type, code);
  479                 icmp6stat.icp6s_outhist[type]++;
  480         } else
  481                 rip6stat.rip6s_opackets++;
  482 
  483         goto freectl;
  484 
  485  bad:
  486         if (m)
  487                 m_freem(m);
  488 
  489  freectl:
  490         if (control) {
  491                 ip6_clearpktopts(in6p->in6p_outputopts, -1);
  492                 in6p->in6p_outputopts = stickyopt;
  493                 m_freem(control);
  494         }
  495         INP_UNLOCK(in6p);
  496         return (error);
  497 }
  498 
  499 /*
  500  * Raw IPv6 socket option processing.
  501  */
  502 int
  503 rip6_ctloutput(so, sopt)
  504         struct socket *so;
  505         struct sockopt *sopt;
  506 {
  507         int error;
  508 
  509         if (sopt->sopt_level == IPPROTO_ICMPV6)
  510                 /*
  511                  * XXX: is it better to call icmp6_ctloutput() directly
  512                  * from protosw?
  513                  */
  514                 return (icmp6_ctloutput(so, sopt));
  515         else if (sopt->sopt_level != IPPROTO_IPV6)
  516                 return (EINVAL);
  517 
  518         error = 0;
  519 
  520         switch (sopt->sopt_dir) {
  521         case SOPT_GET:
  522                 switch (sopt->sopt_name) {
  523                 case MRT6_INIT:
  524                 case MRT6_DONE:
  525                 case MRT6_ADD_MIF:
  526                 case MRT6_DEL_MIF:
  527                 case MRT6_ADD_MFC:
  528                 case MRT6_DEL_MFC:
  529                 case MRT6_PIM:
  530                         error = ip6_mrouter_get(so, sopt);
  531                         break;
  532                 case IPV6_CHECKSUM:
  533                         error = ip6_raw_ctloutput(so, sopt);
  534                         break;
  535                 default:
  536                         error = ip6_ctloutput(so, sopt);
  537                         break;
  538                 }
  539                 break;
  540 
  541         case SOPT_SET:
  542                 switch (sopt->sopt_name) {
  543                 case MRT6_INIT:
  544                 case MRT6_DONE:
  545                 case MRT6_ADD_MIF:
  546                 case MRT6_DEL_MIF:
  547                 case MRT6_ADD_MFC:
  548                 case MRT6_DEL_MFC:
  549                 case MRT6_PIM:
  550                         error = ip6_mrouter_set(so, sopt);
  551                         break;
  552                 case IPV6_CHECKSUM:
  553                         error = ip6_raw_ctloutput(so, sopt);
  554                         break;
  555                 default:
  556                         error = ip6_ctloutput(so, sopt);
  557                         break;
  558                 }
  559                 break;
  560         }
  561 
  562         return (error);
  563 }
  564 
  565 static int
  566 rip6_attach(struct socket *so, int proto, struct thread *td)
  567 {
  568         struct inpcb *inp;
  569         int error, s;
  570 
  571         INP_INFO_WLOCK(&ripcbinfo);
  572         inp = sotoinpcb(so);
  573         if (inp) {
  574                 INP_INFO_WUNLOCK(&ripcbinfo);
  575                 panic("rip6_attach");
  576         }
  577         if (td && (error = suser(td)) != 0) {
  578                 INP_INFO_WUNLOCK(&ripcbinfo);
  579                 return error;
  580         }
  581         error = soreserve(so, rip_sendspace, rip_recvspace);
  582         if (error) {
  583                 INP_INFO_WUNLOCK(&ripcbinfo);
  584                 return error;
  585         }
  586         s = splnet();
  587         error = in_pcballoc(so, &ripcbinfo, "raw6inp");
  588         splx(s);
  589         if (error) {
  590                 INP_INFO_WUNLOCK(&ripcbinfo);
  591                 return error;
  592         }
  593         inp = (struct inpcb *)so->so_pcb;
  594         INP_LOCK(inp);
  595         INP_INFO_WUNLOCK(&ripcbinfo);
  596         inp->inp_vflag |= INP_IPV6;
  597         inp->in6p_ip6_nxt = (long)proto;
  598         inp->in6p_hops = -1;    /* use kernel default */
  599         inp->in6p_cksum = -1;
  600         MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *,
  601                sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
  602         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
  603         INP_UNLOCK(inp);
  604         return 0;
  605 }
  606 
  607 static int
  608 rip6_detach(struct socket *so)
  609 {
  610         struct inpcb *inp;
  611 
  612         INP_INFO_WLOCK(&ripcbinfo);
  613         inp = sotoinpcb(so);
  614         if (inp == 0) {
  615                 INP_INFO_WUNLOCK(&ripcbinfo);
  616                 panic("rip6_detach");
  617         }
  618         /* xxx: RSVP */
  619         if (so == ip6_mrouter)
  620                 ip6_mrouter_done();
  621         if (inp->in6p_icmp6filt) {
  622                 FREE(inp->in6p_icmp6filt, M_PCB);
  623                 inp->in6p_icmp6filt = NULL;
  624         }
  625         INP_LOCK(inp);
  626         in6_pcbdetach(inp);
  627         INP_INFO_WUNLOCK(&ripcbinfo);
  628         return 0;
  629 }
  630 
  631 static int
  632 rip6_abort(struct socket *so)
  633 {
  634         soisdisconnected(so);
  635         return rip6_detach(so);
  636 }
  637 
  638 static int
  639 rip6_disconnect(struct socket *so)
  640 {
  641         struct inpcb *inp = sotoinpcb(so);
  642 
  643         if ((so->so_state & SS_ISCONNECTED) == 0)
  644                 return ENOTCONN;
  645         inp->in6p_faddr = in6addr_any;
  646         return rip6_abort(so);
  647 }
  648 
  649 static int
  650 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  651 {
  652         struct inpcb *inp = sotoinpcb(so);
  653         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  654         struct ifaddr *ia = NULL;
  655 
  656         if (nam->sa_len != sizeof(*addr))
  657                 return EINVAL;
  658         if (TAILQ_EMPTY(&ifnet) || addr->sin6_family != AF_INET6)
  659                 return EADDRNOTAVAIL;
  660 #ifdef ENABLE_DEFAULT_SCOPE
  661         if (addr->sin6_scope_id == 0) { /* not change if specified  */
  662                 addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
  663         }
  664 #endif
  665         if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
  666             (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0)
  667                 return EADDRNOTAVAIL;
  668         if (ia &&
  669             ((struct in6_ifaddr *)ia)->ia6_flags &
  670             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
  671              IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
  672                 return (EADDRNOTAVAIL);
  673         }
  674         INP_INFO_WLOCK(&ripcbinfo);
  675         INP_LOCK(inp);
  676         inp->in6p_laddr = addr->sin6_addr;
  677         INP_UNLOCK(inp);
  678         INP_INFO_WUNLOCK(&ripcbinfo);
  679         return 0;
  680 }
  681 
  682 static int
  683 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  684 {
  685         struct inpcb *inp = sotoinpcb(so);
  686         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  687         struct in6_addr *in6a = NULL;
  688         int error = 0;
  689 #ifdef ENABLE_DEFAULT_SCOPE
  690         struct sockaddr_in6 tmp;
  691 #endif
  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 #ifdef ENABLE_DEFAULT_SCOPE
  700         if (addr->sin6_scope_id == 0) { /* not change if specified  */
  701                 /* avoid overwrites */
  702                 tmp = *addr;
  703                 addr = &tmp;
  704                 addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
  705         }
  706 #endif
  707         INP_INFO_WLOCK(&ripcbinfo);
  708         INP_LOCK(inp);
  709         /* Source address selection. XXX: need pcblookup? */
  710         in6a = in6_selectsrc(addr, inp->in6p_outputopts,
  711                              inp->in6p_moptions, NULL,
  712                              &inp->in6p_laddr, &error);
  713         if (in6a == NULL) {
  714                 INP_UNLOCK(inp);
  715                 INP_INFO_WUNLOCK(&ripcbinfo);
  716                 return (error ? error : EADDRNOTAVAIL);
  717         }
  718         inp->in6p_laddr = *in6a;
  719         inp->in6p_faddr = addr->sin6_addr;
  720         soisconnected(so);
  721         INP_UNLOCK(inp);
  722         INP_INFO_WUNLOCK(&ripcbinfo);
  723         return 0;
  724 }
  725 
  726 static int
  727 rip6_shutdown(struct socket *so)
  728 {
  729         struct inpcb *inp;
  730 
  731         INP_INFO_RLOCK(&ripcbinfo);
  732         inp = sotoinpcb(so);
  733         INP_LOCK(inp);
  734         INP_INFO_RUNLOCK(&ripcbinfo);
  735         socantsendmore(so);
  736         INP_UNLOCK(inp);
  737         return 0;
  738 }
  739 
  740 static int
  741 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  742          struct mbuf *control, struct thread *td)
  743 {
  744         struct inpcb *inp = sotoinpcb(so);
  745         struct sockaddr_in6 tmp;
  746         struct sockaddr_in6 *dst;
  747         int ret;
  748 
  749         INP_INFO_WLOCK(&ripcbinfo);
  750         /* always copy sockaddr to avoid overwrites */
  751         /* Unlocked read. */
  752         if (so->so_state & SS_ISCONNECTED) {
  753                 if (nam) {
  754                         INP_INFO_WUNLOCK(&ripcbinfo);
  755                         m_freem(m);
  756                         return EISCONN;
  757                 }
  758                 /* XXX */
  759                 bzero(&tmp, sizeof(tmp));
  760                 tmp.sin6_family = AF_INET6;
  761                 tmp.sin6_len = sizeof(struct sockaddr_in6);
  762                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
  763                       sizeof(struct in6_addr));
  764                 dst = &tmp;
  765         } else {
  766                 if (nam == NULL) {
  767                         INP_INFO_WUNLOCK(&ripcbinfo);
  768                         m_freem(m);
  769                         return ENOTCONN;
  770                 }
  771                 tmp = *(struct sockaddr_in6 *)nam;
  772                 dst = &tmp;
  773         }
  774 #ifdef ENABLE_DEFAULT_SCOPE
  775         if (dst->sin6_scope_id == 0) {  /* not change if specified  */
  776                 dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr);
  777         }
  778 #endif
  779         ret = rip6_output(m, so, dst, control);
  780         INP_INFO_WUNLOCK(&ripcbinfo);
  781         return (ret);
  782 }
  783 
  784 struct pr_usrreqs rip6_usrreqs = {
  785         rip6_abort, pru_accept_notsupp, rip6_attach, rip6_bind, rip6_connect,
  786         pru_connect2_notsupp, in6_control, rip6_detach, rip6_disconnect,
  787         pru_listen_notsupp, in6_setpeeraddr, pru_rcvd_notsupp,
  788         pru_rcvoob_notsupp, rip6_send, pru_sense_null, rip6_shutdown,
  789         in6_setsockaddr, sosend, soreceive, sopoll, pru_sosetlabel_null
  790 };

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