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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the project nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 /*-
   33  * Copyright (c) 1982, 1986, 1988, 1993
   34  *      The Regents of the University of California.
   35  * All rights reserved.
   36  *
   37  * Redistribution and use in source and binary forms, with or without
   38  * modification, are permitted provided that the following conditions
   39  * are met:
   40  * 1. Redistributions of source code must retain the above copyright
   41  *    notice, this list of conditions and the following disclaimer.
   42  * 2. Redistributions in binary form must reproduce the above copyright
   43  *    notice, this list of conditions and the following disclaimer in the
   44  *    documentation and/or other materials provided with the distribution.
   45  * 3. Neither the name of the University nor the names of its contributors
   46  *    may be used to endorse or promote products derived from this software
   47  *    without specific prior written permission.
   48  *
   49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   59  * SUCH DAMAGE.
   60  *
   61  *      @(#)raw_ip.c    8.2 (Berkeley) 1/4/94
   62  */
   63 
   64 #include <sys/cdefs.h>
   65 __FBSDID("$FreeBSD: stable/12/sys/netinet6/raw_ip6.c 339950 2018-10-31 12:49:18Z bz $");
   66 
   67 #include "opt_ipsec.h"
   68 #include "opt_inet6.h"
   69 
   70 #include <sys/param.h>
   71 #include <sys/errno.h>
   72 #include <sys/jail.h>
   73 #include <sys/kernel.h>
   74 #include <sys/lock.h>
   75 #include <sys/malloc.h>
   76 #include <sys/mbuf.h>
   77 #include <sys/priv.h>
   78 #include <sys/proc.h>
   79 #include <sys/protosw.h>
   80 #include <sys/signalvar.h>
   81 #include <sys/socket.h>
   82 #include <sys/socketvar.h>
   83 #include <sys/sx.h>
   84 #include <sys/syslog.h>
   85 
   86 #include <net/if.h>
   87 #include <net/if_var.h>
   88 #include <net/if_types.h>
   89 #include <net/route.h>
   90 #include <net/vnet.h>
   91 
   92 #include <netinet/in.h>
   93 #include <netinet/in_var.h>
   94 #include <netinet/in_systm.h>
   95 #include <netinet/in_pcb.h>
   96 
   97 #include <netinet/icmp6.h>
   98 #include <netinet/ip6.h>
   99 #include <netinet/ip_var.h>
  100 #include <netinet6/ip6protosw.h>
  101 #include <netinet6/ip6_mroute.h>
  102 #include <netinet6/in6_pcb.h>
  103 #include <netinet6/ip6_var.h>
  104 #include <netinet6/nd6.h>
  105 #include <netinet6/raw_ip6.h>
  106 #include <netinet6/scope6_var.h>
  107 #include <netinet6/send.h>
  108 
  109 #include <netipsec/ipsec_support.h>
  110 
  111 #include <machine/stdarg.h>
  112 
  113 #define satosin6(sa)    ((struct sockaddr_in6 *)(sa))
  114 #define ifatoia6(ifa)   ((struct in6_ifaddr *)(ifa))
  115 
  116 /*
  117  * Raw interface to IP6 protocol.
  118  */
  119 
  120 VNET_DECLARE(struct inpcbhead, ripcb);
  121 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
  122 #define V_ripcb                         VNET(ripcb)
  123 #define V_ripcbinfo                     VNET(ripcbinfo)
  124 
  125 extern u_long   rip_sendspace;
  126 extern u_long   rip_recvspace;
  127 
  128 VNET_PCPUSTAT_DEFINE(struct rip6stat, rip6stat);
  129 VNET_PCPUSTAT_SYSINIT(rip6stat);
  130 
  131 #ifdef VIMAGE
  132 VNET_PCPUSTAT_SYSUNINIT(rip6stat);
  133 #endif /* VIMAGE */
  134 
  135 /*
  136  * Hooks for multicast routing. They all default to NULL, so leave them not
  137  * initialized and rely on BSS being set to 0.
  138  */
  139 
  140 /*
  141  * The socket used to communicate with the multicast routing daemon.
  142  */
  143 VNET_DEFINE(struct socket *, ip6_mrouter);
  144 
  145 /*
  146  * The various mrouter functions.
  147  */
  148 int (*ip6_mrouter_set)(struct socket *, struct sockopt *);
  149 int (*ip6_mrouter_get)(struct socket *, struct sockopt *);
  150 int (*ip6_mrouter_done)(void);
  151 int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *);
  152 int (*mrt6_ioctl)(u_long, caddr_t);
  153 
  154 /*
  155  * Setup generic address and protocol structures for raw_input routine, then
  156  * pass them along with mbuf chain.
  157  */
  158 int
  159 rip6_input(struct mbuf **mp, int *offp, int proto)
  160 {
  161         struct ifnet *ifp;
  162         struct mbuf *m = *mp;
  163         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  164         struct inpcb *in6p;
  165         struct inpcb *last = NULL;
  166         struct mbuf *opts = NULL;
  167         struct sockaddr_in6 fromsa;
  168         struct epoch_tracker et;
  169 
  170         RIP6STAT_INC(rip6s_ipackets);
  171 
  172         init_sin6(&fromsa, m, 0); /* general init */
  173 
  174         ifp = m->m_pkthdr.rcvif;
  175 
  176         INP_INFO_RLOCK_ET(&V_ripcbinfo, et);
  177         CK_LIST_FOREACH(in6p, &V_ripcb, inp_list) {
  178                 /* XXX inp locking */
  179                 if ((in6p->inp_vflag & INP_IPV6) == 0)
  180                         continue;
  181                 if (in6p->inp_ip_p &&
  182                     in6p->inp_ip_p != proto)
  183                         continue;
  184                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
  185                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
  186                         continue;
  187                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
  188                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
  189                         continue;
  190                 if (last != NULL) {
  191                         struct mbuf *n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
  192 
  193 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
  194                         /*
  195                          * Check AH/ESP integrity.
  196                          */
  197                         if (IPSEC_ENABLED(ipv6)) {
  198                                 if (n != NULL &&
  199                                     IPSEC_CHECK_POLICY(ipv6, n, last) != 0) {
  200                                         m_freem(n);
  201                                         /* Do not inject data into pcb. */
  202                                         n = NULL;
  203                                 }
  204                         }
  205 #endif /* IPSEC */
  206                         if (n) {
  207                                 if (last->inp_flags & INP_CONTROLOPTS ||
  208                                     last->inp_socket->so_options & SO_TIMESTAMP)
  209                                         ip6_savecontrol(last, n, &opts);
  210                                 /* strip intermediate headers */
  211                                 m_adj(n, *offp);
  212                                 if (sbappendaddr(&last->inp_socket->so_rcv,
  213                                                 (struct sockaddr *)&fromsa,
  214                                                  n, opts) == 0) {
  215                                         m_freem(n);
  216                                         if (opts)
  217                                                 m_freem(opts);
  218                                         RIP6STAT_INC(rip6s_fullsock);
  219                                 } else
  220                                         sorwakeup(last->inp_socket);
  221                                 opts = NULL;
  222                         }
  223                         INP_RUNLOCK(last);
  224                         last = NULL;
  225                 }
  226                 INP_RLOCK(in6p);
  227                 if (__predict_false(in6p->inp_flags2 & INP_FREED))
  228                         goto skip_2;
  229                 if (jailed_without_vnet(in6p->inp_cred)) {
  230                         /*
  231                          * Allow raw socket in jail to receive multicast;
  232                          * assume process had PRIV_NETINET_RAW at attach,
  233                          * and fall through into normal filter path if so.
  234                          */
  235                         if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
  236                             prison_check_ip6(in6p->inp_cred,
  237                             &ip6->ip6_dst) != 0)
  238                                 goto skip_2;
  239                 }
  240                 if (in6p->in6p_cksum != -1) {
  241                         RIP6STAT_INC(rip6s_isum);
  242                         if (in6_cksum(m, proto, *offp,
  243                             m->m_pkthdr.len - *offp)) {
  244                                 RIP6STAT_INC(rip6s_badsum);
  245                                 goto skip_2;
  246                         }
  247                 }
  248                 /*
  249                  * If this raw socket has multicast state, and we
  250                  * have received a multicast, check if this socket
  251                  * should receive it, as multicast filtering is now
  252                  * the responsibility of the transport layer.
  253                  */
  254                 if (in6p->in6p_moptions &&
  255                     IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  256                         /*
  257                          * If the incoming datagram is for MLD, allow it
  258                          * through unconditionally to the raw socket.
  259                          *
  260                          * Use the M_RTALERT_MLD flag to check for MLD
  261                          * traffic without having to inspect the mbuf chain
  262                          * more deeply, as all MLDv1/v2 host messages MUST
  263                          * contain the Router Alert option.
  264                          *
  265                          * In the case of MLDv1, we may not have explicitly
  266                          * joined the group, and may have set IFF_ALLMULTI
  267                          * on the interface. im6o_mc_filter() may discard
  268                          * control traffic we actually need to see.
  269                          *
  270                          * Userland multicast routing daemons should continue
  271                          * filter the control traffic appropriately.
  272                          */
  273                         int blocked;
  274 
  275                         blocked = MCAST_PASS;
  276                         if ((m->m_flags & M_RTALERT_MLD) == 0) {
  277                                 struct sockaddr_in6 mcaddr;
  278 
  279                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
  280                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
  281                                 mcaddr.sin6_family = AF_INET6;
  282                                 mcaddr.sin6_addr = ip6->ip6_dst;
  283 
  284                                 blocked = im6o_mc_filter(in6p->in6p_moptions,
  285                                     ifp,
  286                                     (struct sockaddr *)&mcaddr,
  287                                     (struct sockaddr *)&fromsa);
  288                         }
  289                         if (blocked != MCAST_PASS) {
  290                                 IP6STAT_INC(ip6s_notmember);
  291                                 goto skip_2;
  292                         }
  293                 }
  294                 last = in6p;
  295                 continue;
  296 skip_2:
  297                 INP_RUNLOCK(in6p);
  298         }
  299         INP_INFO_RUNLOCK_ET(&V_ripcbinfo, et);
  300 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
  301         /*
  302          * Check AH/ESP integrity.
  303          */
  304         if (IPSEC_ENABLED(ipv6) && last != NULL &&
  305             IPSEC_CHECK_POLICY(ipv6, m, last) != 0) {
  306                 m_freem(m);
  307                 IP6STAT_DEC(ip6s_delivered);
  308                 /* Do not inject data into pcb. */
  309                 INP_RUNLOCK(last);
  310         } else
  311 #endif /* IPSEC */
  312         if (last != NULL) {
  313                 if (last->inp_flags & INP_CONTROLOPTS ||
  314                     last->inp_socket->so_options & SO_TIMESTAMP)
  315                         ip6_savecontrol(last, m, &opts);
  316                 /* Strip intermediate headers. */
  317                 m_adj(m, *offp);
  318                 if (sbappendaddr(&last->inp_socket->so_rcv,
  319                     (struct sockaddr *)&fromsa, m, opts) == 0) {
  320                         m_freem(m);
  321                         if (opts)
  322                                 m_freem(opts);
  323                         RIP6STAT_INC(rip6s_fullsock);
  324                 } else
  325                         sorwakeup(last->inp_socket);
  326                 INP_RUNLOCK(last);
  327         } else {
  328                 RIP6STAT_INC(rip6s_nosock);
  329                 if (m->m_flags & M_MCAST)
  330                         RIP6STAT_INC(rip6s_nosockmcast);
  331                 if (proto == IPPROTO_NONE)
  332                         m_freem(m);
  333                 else
  334                         icmp6_error(m, ICMP6_PARAM_PROB,
  335                             ICMP6_PARAMPROB_NEXTHEADER,
  336                             ip6_get_prevhdr(m, *offp));
  337                 IP6STAT_DEC(ip6s_delivered);
  338         }
  339         return (IPPROTO_DONE);
  340 }
  341 
  342 void
  343 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d)
  344 {
  345         struct ip6ctlparam *ip6cp = NULL;
  346         const struct sockaddr_in6 *sa6_src = NULL;
  347         void *cmdarg;
  348         struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange;
  349 
  350         if (sa->sa_family != AF_INET6 ||
  351             sa->sa_len != sizeof(struct sockaddr_in6))
  352                 return;
  353 
  354         if ((unsigned)cmd >= PRC_NCMDS)
  355                 return;
  356         if (PRC_IS_REDIRECT(cmd))
  357                 notify = in6_rtchange, d = NULL;
  358         else if (cmd == PRC_HOSTDEAD)
  359                 d = NULL;
  360         else if (inet6ctlerrmap[cmd] == 0)
  361                 return;
  362 
  363         /*
  364          * If the parameter is from icmp6, decode it.
  365          */
  366         if (d != NULL) {
  367                 ip6cp = (struct ip6ctlparam *)d;
  368                 cmdarg = ip6cp->ip6c_cmdarg;
  369                 sa6_src = ip6cp->ip6c_src;
  370         } else {
  371                 cmdarg = NULL;
  372                 sa6_src = &sa6_any;
  373         }
  374 
  375         (void) in6_pcbnotify(&V_ripcbinfo, sa, 0,
  376             (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
  377 }
  378 
  379 /*
  380  * Generate IPv6 header and pass packet to ip6_output.  Tack on options user
  381  * may have setup with control call.
  382  */
  383 int
  384 rip6_output(struct mbuf *m, struct socket *so, ...)
  385 {
  386         struct mbuf *control;
  387         struct m_tag *mtag;
  388         struct sockaddr_in6 *dstsock;
  389         struct ip6_hdr *ip6;
  390         struct inpcb *in6p;
  391         u_int   plen = m->m_pkthdr.len;
  392         int error = 0;
  393         struct ip6_pktopts opt, *optp;
  394         struct ifnet *oifp = NULL;
  395         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
  396         int scope_ambiguous = 0;
  397         int use_defzone = 0;
  398         int hlim = 0;
  399         struct in6_addr in6a;
  400         va_list ap;
  401 
  402         va_start(ap, so);
  403         dstsock = va_arg(ap, struct sockaddr_in6 *);
  404         control = va_arg(ap, struct mbuf *);
  405         va_end(ap);
  406 
  407         in6p = sotoinpcb(so);
  408         INP_WLOCK(in6p);
  409 
  410         if (control != NULL) {
  411                 if ((error = ip6_setpktopts(control, &opt,
  412                     in6p->in6p_outputopts, so->so_cred,
  413                     so->so_proto->pr_protocol)) != 0) {
  414                         goto bad;
  415                 }
  416                 optp = &opt;
  417         } else
  418                 optp = in6p->in6p_outputopts;
  419 
  420         /*
  421          * Check and convert scope zone ID into internal form.
  422          *
  423          * XXX: we may still need to determine the zone later.
  424          */
  425         if (!(so->so_state & SS_ISCONNECTED)) {
  426                 if (!optp || !optp->ip6po_pktinfo ||
  427                     !optp->ip6po_pktinfo->ipi6_ifindex)
  428                         use_defzone = V_ip6_use_defzone;
  429                 if (dstsock->sin6_scope_id == 0 && !use_defzone)
  430                         scope_ambiguous = 1;
  431                 if ((error = sa6_embedscope(dstsock, use_defzone)) != 0)
  432                         goto bad;
  433         }
  434 
  435         /*
  436          * For an ICMPv6 packet, we should know its type and code to update
  437          * statistics.
  438          */
  439         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  440                 struct icmp6_hdr *icmp6;
  441                 if (m->m_len < sizeof(struct icmp6_hdr) &&
  442                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
  443                         error = ENOBUFS;
  444                         goto bad;
  445                 }
  446                 icmp6 = mtod(m, struct icmp6_hdr *);
  447                 type = icmp6->icmp6_type;
  448                 code = icmp6->icmp6_code;
  449         }
  450 
  451         M_PREPEND(m, sizeof(*ip6), M_NOWAIT);
  452         if (m == NULL) {
  453                 error = ENOBUFS;
  454                 goto bad;
  455         }
  456         ip6 = mtod(m, struct ip6_hdr *);
  457 
  458         /*
  459          * Source address selection.
  460          */
  461         error = in6_selectsrc_socket(dstsock, optp, in6p, so->so_cred,
  462             scope_ambiguous, &in6a, &hlim);
  463 
  464         if (error)
  465                 goto bad;
  466         error = prison_check_ip6(in6p->inp_cred, &in6a);
  467         if (error != 0)
  468                 goto bad;
  469         ip6->ip6_src = in6a;
  470 
  471         ip6->ip6_dst = dstsock->sin6_addr;
  472 
  473         /*
  474          * Fill in the rest of the IPv6 header fields.
  475          */
  476         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
  477             (in6p->inp_flow & IPV6_FLOWINFO_MASK);
  478         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
  479             (IPV6_VERSION & IPV6_VERSION_MASK);
  480 
  481         /*
  482          * ip6_plen will be filled in ip6_output, so not fill it here.
  483          */
  484         ip6->ip6_nxt = in6p->inp_ip_p;
  485         ip6->ip6_hlim = hlim;
  486 
  487         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
  488             in6p->in6p_cksum != -1) {
  489                 struct mbuf *n;
  490                 int off;
  491                 u_int16_t *p;
  492 
  493                 /* Compute checksum. */
  494                 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
  495                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
  496                 else
  497                         off = in6p->in6p_cksum;
  498                 if (plen < off + 1) {
  499                         error = EINVAL;
  500                         goto bad;
  501                 }
  502                 off += sizeof(struct ip6_hdr);
  503 
  504                 n = m;
  505                 while (n && n->m_len <= off) {
  506                         off -= n->m_len;
  507                         n = n->m_next;
  508                 }
  509                 if (!n)
  510                         goto bad;
  511                 p = (u_int16_t *)(mtod(n, caddr_t) + off);
  512                 *p = 0;
  513                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
  514         }
  515 
  516         /*
  517          * Send RA/RS messages to user land for protection, before sending
  518          * them to rtadvd/rtsol.
  519          */
  520         if ((send_sendso_input_hook != NULL) &&
  521             so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  522                 switch (type) {
  523                 case ND_ROUTER_ADVERT:
  524                 case ND_ROUTER_SOLICIT:
  525                         mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
  526                                 sizeof(unsigned short), M_NOWAIT);
  527                         if (mtag == NULL)
  528                                 goto bad;
  529                         m_tag_prepend(m, mtag);
  530                 }
  531         }
  532 
  533         error = ip6_output(m, optp, NULL, 0, in6p->in6p_moptions, &oifp, in6p);
  534         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  535                 if (oifp)
  536                         icmp6_ifoutstat_inc(oifp, type, code);
  537                 ICMP6STAT_INC(icp6s_outhist[type]);
  538         } else
  539                 RIP6STAT_INC(rip6s_opackets);
  540 
  541         goto freectl;
  542 
  543  bad:
  544         if (m)
  545                 m_freem(m);
  546 
  547  freectl:
  548         if (control != NULL) {
  549                 ip6_clearpktopts(&opt, -1);
  550                 m_freem(control);
  551         }
  552         INP_WUNLOCK(in6p);
  553         return (error);
  554 }
  555 
  556 /*
  557  * Raw IPv6 socket option processing.
  558  */
  559 int
  560 rip6_ctloutput(struct socket *so, struct sockopt *sopt)
  561 {
  562         struct inpcb *inp;
  563         int error;
  564 
  565         if (sopt->sopt_level == IPPROTO_ICMPV6)
  566                 /*
  567                  * XXX: is it better to call icmp6_ctloutput() directly
  568                  * from protosw?
  569                  */
  570                 return (icmp6_ctloutput(so, sopt));
  571         else if (sopt->sopt_level != IPPROTO_IPV6) {
  572                 if (sopt->sopt_level == SOL_SOCKET &&
  573                     sopt->sopt_name == SO_SETFIB) {
  574                         inp = sotoinpcb(so);
  575                         INP_WLOCK(inp);
  576                         inp->inp_inc.inc_fibnum = so->so_fibnum;
  577                         INP_WUNLOCK(inp);
  578                         return (0);
  579                 }
  580                 return (EINVAL);
  581         }
  582 
  583         error = 0;
  584 
  585         switch (sopt->sopt_dir) {
  586         case SOPT_GET:
  587                 switch (sopt->sopt_name) {
  588                 case MRT6_INIT:
  589                 case MRT6_DONE:
  590                 case MRT6_ADD_MIF:
  591                 case MRT6_DEL_MIF:
  592                 case MRT6_ADD_MFC:
  593                 case MRT6_DEL_MFC:
  594                 case MRT6_PIM:
  595                         error = ip6_mrouter_get ?  ip6_mrouter_get(so, sopt) :
  596                             EOPNOTSUPP;
  597                         break;
  598                 case IPV6_CHECKSUM:
  599                         error = ip6_raw_ctloutput(so, sopt);
  600                         break;
  601                 default:
  602                         error = ip6_ctloutput(so, sopt);
  603                         break;
  604                 }
  605                 break;
  606 
  607         case SOPT_SET:
  608                 switch (sopt->sopt_name) {
  609                 case MRT6_INIT:
  610                 case MRT6_DONE:
  611                 case MRT6_ADD_MIF:
  612                 case MRT6_DEL_MIF:
  613                 case MRT6_ADD_MFC:
  614                 case MRT6_DEL_MFC:
  615                 case MRT6_PIM:
  616                         error = ip6_mrouter_set ?  ip6_mrouter_set(so, sopt) :
  617                             EOPNOTSUPP;
  618                         break;
  619                 case IPV6_CHECKSUM:
  620                         error = ip6_raw_ctloutput(so, sopt);
  621                         break;
  622                 default:
  623                         error = ip6_ctloutput(so, sopt);
  624                         break;
  625                 }
  626                 break;
  627         }
  628 
  629         return (error);
  630 }
  631 
  632 static int
  633 rip6_attach(struct socket *so, int proto, struct thread *td)
  634 {
  635         struct inpcb *inp;
  636         struct icmp6_filter *filter;
  637         int error;
  638 
  639         inp = sotoinpcb(so);
  640         KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
  641 
  642         error = priv_check(td, PRIV_NETINET_RAW);
  643         if (error)
  644                 return (error);
  645         error = soreserve(so, rip_sendspace, rip_recvspace);
  646         if (error)
  647                 return (error);
  648         filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
  649         if (filter == NULL)
  650                 return (ENOMEM);
  651         INP_INFO_WLOCK(&V_ripcbinfo);
  652         error = in_pcballoc(so, &V_ripcbinfo);
  653         if (error) {
  654                 INP_INFO_WUNLOCK(&V_ripcbinfo);
  655                 free(filter, M_PCB);
  656                 return (error);
  657         }
  658         inp = (struct inpcb *)so->so_pcb;
  659         INP_INFO_WUNLOCK(&V_ripcbinfo);
  660         inp->inp_vflag |= INP_IPV6;
  661         inp->inp_ip_p = (long)proto;
  662         inp->in6p_hops = -1;    /* use kernel default */
  663         inp->in6p_cksum = -1;
  664         inp->in6p_icmp6filt = filter;
  665         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
  666         INP_WUNLOCK(inp);
  667         return (0);
  668 }
  669 
  670 static void
  671 rip6_detach(struct socket *so)
  672 {
  673         struct inpcb *inp;
  674 
  675         inp = sotoinpcb(so);
  676         KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
  677 
  678         if (so == V_ip6_mrouter && ip6_mrouter_done)
  679                 ip6_mrouter_done();
  680         /* xxx: RSVP */
  681         INP_INFO_WLOCK(&V_ripcbinfo);
  682         INP_WLOCK(inp);
  683         free(inp->in6p_icmp6filt, M_PCB);
  684         in_pcbdetach(inp);
  685         in_pcbfree(inp);
  686         INP_INFO_WUNLOCK(&V_ripcbinfo);
  687 }
  688 
  689 /* XXXRW: This can't ever be called. */
  690 static void
  691 rip6_abort(struct socket *so)
  692 {
  693         struct inpcb *inp;
  694 
  695         inp = sotoinpcb(so);
  696         KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
  697 
  698         soisdisconnected(so);
  699 }
  700 
  701 static void
  702 rip6_close(struct socket *so)
  703 {
  704         struct inpcb *inp;
  705 
  706         inp = sotoinpcb(so);
  707         KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
  708 
  709         soisdisconnected(so);
  710 }
  711 
  712 static int
  713 rip6_disconnect(struct socket *so)
  714 {
  715         struct inpcb *inp;
  716 
  717         inp = sotoinpcb(so);
  718         KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
  719 
  720         if ((so->so_state & SS_ISCONNECTED) == 0)
  721                 return (ENOTCONN);
  722         inp->in6p_faddr = in6addr_any;
  723         rip6_abort(so);
  724         return (0);
  725 }
  726 
  727 static int
  728 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  729 {
  730         struct inpcb *inp;
  731         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  732         struct ifaddr *ifa = NULL;
  733         int error = 0;
  734 
  735         inp = sotoinpcb(so);
  736         KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
  737 
  738         if (nam->sa_len != sizeof(*addr))
  739                 return (EINVAL);
  740         if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
  741                 return (error);
  742         if (CK_STAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
  743                 return (EADDRNOTAVAIL);
  744         if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
  745                 return (error);
  746 
  747         NET_EPOCH_ENTER();
  748         if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
  749             (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL) {
  750                 NET_EPOCH_EXIT();
  751                 return (EADDRNOTAVAIL);
  752         }
  753         if (ifa != NULL &&
  754             ((struct in6_ifaddr *)ifa)->ia6_flags &
  755             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
  756              IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
  757                 NET_EPOCH_EXIT();
  758                 return (EADDRNOTAVAIL);
  759         }
  760         NET_EPOCH_EXIT();
  761         INP_INFO_WLOCK(&V_ripcbinfo);
  762         INP_WLOCK(inp);
  763         inp->in6p_laddr = addr->sin6_addr;
  764         INP_WUNLOCK(inp);
  765         INP_INFO_WUNLOCK(&V_ripcbinfo);
  766         return (0);
  767 }
  768 
  769 static int
  770 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  771 {
  772         struct inpcb *inp;
  773         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  774         struct in6_addr in6a;
  775         int error = 0, scope_ambiguous = 0;
  776 
  777         inp = sotoinpcb(so);
  778         KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
  779 
  780         if (nam->sa_len != sizeof(*addr))
  781                 return (EINVAL);
  782         if (CK_STAILQ_EMPTY(&V_ifnet))
  783                 return (EADDRNOTAVAIL);
  784         if (addr->sin6_family != AF_INET6)
  785                 return (EAFNOSUPPORT);
  786 
  787         /*
  788          * Application should provide a proper zone ID or the use of default
  789          * zone IDs should be enabled.  Unfortunately, some applications do
  790          * not behave as it should, so we need a workaround.  Even if an
  791          * appropriate ID is not determined, we'll see if we can determine
  792          * the outgoing interface.  If we can, determine the zone ID based on
  793          * the interface below.
  794          */
  795         if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
  796                 scope_ambiguous = 1;
  797         if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
  798                 return (error);
  799 
  800         INP_INFO_WLOCK(&V_ripcbinfo);
  801         INP_WLOCK(inp);
  802         /* Source address selection. XXX: need pcblookup? */
  803         error = in6_selectsrc_socket(addr, inp->in6p_outputopts,
  804             inp, so->so_cred, scope_ambiguous, &in6a, NULL);
  805         if (error) {
  806                 INP_WUNLOCK(inp);
  807                 INP_INFO_WUNLOCK(&V_ripcbinfo);
  808                 return (error);
  809         }
  810 
  811         inp->in6p_faddr = addr->sin6_addr;
  812         inp->in6p_laddr = in6a;
  813         soisconnected(so);
  814         INP_WUNLOCK(inp);
  815         INP_INFO_WUNLOCK(&V_ripcbinfo);
  816         return (0);
  817 }
  818 
  819 static int
  820 rip6_shutdown(struct socket *so)
  821 {
  822         struct inpcb *inp;
  823 
  824         inp = sotoinpcb(so);
  825         KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL"));
  826 
  827         INP_WLOCK(inp);
  828         socantsendmore(so);
  829         INP_WUNLOCK(inp);
  830         return (0);
  831 }
  832 
  833 static int
  834 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  835     struct mbuf *control, struct thread *td)
  836 {
  837         struct inpcb *inp;
  838         struct sockaddr_in6 tmp;
  839         struct sockaddr_in6 *dst;
  840         int ret;
  841 
  842         inp = sotoinpcb(so);
  843         KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
  844 
  845         /* Always copy sockaddr to avoid overwrites. */
  846         /* Unlocked read. */
  847         if (so->so_state & SS_ISCONNECTED) {
  848                 if (nam) {
  849                         m_freem(m);
  850                         return (EISCONN);
  851                 }
  852                 /* XXX */
  853                 bzero(&tmp, sizeof(tmp));
  854                 tmp.sin6_family = AF_INET6;
  855                 tmp.sin6_len = sizeof(struct sockaddr_in6);
  856                 INP_RLOCK(inp);
  857                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
  858                     sizeof(struct in6_addr));
  859                 INP_RUNLOCK(inp);
  860                 dst = &tmp;
  861         } else {
  862                 if (nam == NULL) {
  863                         m_freem(m);
  864                         return (ENOTCONN);
  865                 }
  866                 if (nam->sa_len != sizeof(struct sockaddr_in6)) {
  867                         m_freem(m);
  868                         return (EINVAL);
  869                 }
  870                 tmp = *(struct sockaddr_in6 *)nam;
  871                 dst = &tmp;
  872 
  873                 if (dst->sin6_family == AF_UNSPEC) {
  874                         /*
  875                          * XXX: we allow this case for backward
  876                          * compatibility to buggy applications that
  877                          * rely on old (and wrong) kernel behavior.
  878                          */
  879                         log(LOG_INFO, "rip6 SEND: address family is "
  880                             "unspec. Assume AF_INET6\n");
  881                         dst->sin6_family = AF_INET6;
  882                 } else if (dst->sin6_family != AF_INET6) {
  883                         m_freem(m);
  884                         return(EAFNOSUPPORT);
  885                 }
  886         }
  887         ret = rip6_output(m, so, dst, control);
  888         return (ret);
  889 }
  890 
  891 struct pr_usrreqs rip6_usrreqs = {
  892         .pru_abort =            rip6_abort,
  893         .pru_attach =           rip6_attach,
  894         .pru_bind =             rip6_bind,
  895         .pru_connect =          rip6_connect,
  896         .pru_control =          in6_control,
  897         .pru_detach =           rip6_detach,
  898         .pru_disconnect =       rip6_disconnect,
  899         .pru_peeraddr =         in6_getpeeraddr,
  900         .pru_send =             rip6_send,
  901         .pru_shutdown =         rip6_shutdown,
  902         .pru_sockaddr =         in6_getsockaddr,
  903         .pru_close =            rip6_close,
  904 };

Cache object: 05ff2b6e26c2da6077f60b804653b57b


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