The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/netinet6/raw_ip6.c

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    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: releng/11.1/sys/netinet6/raw_ip6.c 315514 2017-03-18 22:04:20Z ae $");
   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/kernel.h>
   72 #include <sys/lock.h>
   73 #include <sys/malloc.h>
   74 #include <sys/mbuf.h>
   75 #include <sys/priv.h>
   76 #include <sys/proc.h>
   77 #include <sys/protosw.h>
   78 #include <sys/signalvar.h>
   79 #include <sys/socket.h>
   80 #include <sys/socketvar.h>
   81 #include <sys/sx.h>
   82 #include <sys/syslog.h>
   83 
   84 #include <net/if.h>
   85 #include <net/if_var.h>
   86 #include <net/if_types.h>
   87 #include <net/route.h>
   88 #include <net/vnet.h>
   89 
   90 #include <netinet/in.h>
   91 #include <netinet/in_var.h>
   92 #include <netinet/in_systm.h>
   93 #include <netinet/in_pcb.h>
   94 
   95 #include <netinet/icmp6.h>
   96 #include <netinet/ip6.h>
   97 #include <netinet/ip_var.h>
   98 #include <netinet6/ip6protosw.h>
   99 #include <netinet6/ip6_mroute.h>
  100 #include <netinet6/in6_pcb.h>
  101 #include <netinet6/ip6_var.h>
  102 #include <netinet6/nd6.h>
  103 #include <netinet6/raw_ip6.h>
  104 #include <netinet6/scope6_var.h>
  105 #include <netinet6/send.h>
  106 
  107 #include <netipsec/ipsec_support.h>
  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 VNET_DECLARE(struct inpcbhead, ripcb);
  119 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
  120 #define V_ripcb                         VNET(ripcb)
  121 #define V_ripcbinfo                     VNET(ripcbinfo)
  122 
  123 extern u_long   rip_sendspace;
  124 extern u_long   rip_recvspace;
  125 
  126 VNET_PCPUSTAT_DEFINE(struct rip6stat, rip6stat);
  127 VNET_PCPUSTAT_SYSINIT(rip6stat);
  128 
  129 #ifdef VIMAGE
  130 VNET_PCPUSTAT_SYSUNINIT(rip6stat);
  131 #endif /* VIMAGE */
  132 
  133 /*
  134  * Hooks for multicast routing. They all default to NULL, so leave them not
  135  * initialized and rely on BSS being set to 0.
  136  */
  137 
  138 /*
  139  * The socket used to communicate with the multicast routing daemon.
  140  */
  141 VNET_DEFINE(struct socket *, ip6_mrouter);
  142 
  143 /*
  144  * The various mrouter functions.
  145  */
  146 int (*ip6_mrouter_set)(struct socket *, struct sockopt *);
  147 int (*ip6_mrouter_get)(struct socket *, struct sockopt *);
  148 int (*ip6_mrouter_done)(void);
  149 int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *);
  150 int (*mrt6_ioctl)(u_long, caddr_t);
  151 
  152 /*
  153  * Setup generic address and protocol structures for raw_input routine, then
  154  * pass them along with mbuf chain.
  155  */
  156 int
  157 rip6_input(struct mbuf **mp, int *offp, int proto)
  158 {
  159         struct ifnet *ifp;
  160         struct mbuf *m = *mp;
  161         register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  162         register struct inpcb *in6p;
  163         struct inpcb *last = NULL;
  164         struct mbuf *opts = NULL;
  165         struct sockaddr_in6 fromsa;
  166 
  167         RIP6STAT_INC(rip6s_ipackets);
  168 
  169         init_sin6(&fromsa, m); /* general init */
  170 
  171         ifp = m->m_pkthdr.rcvif;
  172 
  173         INP_INFO_RLOCK(&V_ripcbinfo);
  174         LIST_FOREACH(in6p, &V_ripcb, inp_list) {
  175                 /* XXX inp locking */
  176                 if ((in6p->inp_vflag & INP_IPV6) == 0)
  177                         continue;
  178                 if (in6p->inp_ip_p &&
  179                     in6p->inp_ip_p != proto)
  180                         continue;
  181                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
  182                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
  183                         continue;
  184                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
  185                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
  186                         continue;
  187                 if (jailed_without_vnet(in6p->inp_cred)) {
  188                         /*
  189                          * Allow raw socket in jail to receive multicast;
  190                          * assume process had PRIV_NETINET_RAW at attach,
  191                          * and fall through into normal filter path if so.
  192                          */
  193                         if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
  194                             prison_check_ip6(in6p->inp_cred,
  195                             &ip6->ip6_dst) != 0)
  196                                 continue;
  197                 }
  198                 INP_RLOCK(in6p);
  199                 if (in6p->in6p_cksum != -1) {
  200                         RIP6STAT_INC(rip6s_isum);
  201                         if (in6_cksum(m, proto, *offp,
  202                             m->m_pkthdr.len - *offp)) {
  203                                 INP_RUNLOCK(in6p);
  204                                 RIP6STAT_INC(rip6s_badsum);
  205                                 continue;
  206                         }
  207                 }
  208                 /*
  209                  * If this raw socket has multicast state, and we
  210                  * have received a multicast, check if this socket
  211                  * should receive it, as multicast filtering is now
  212                  * the responsibility of the transport layer.
  213                  */
  214                 if (in6p->in6p_moptions &&
  215                     IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  216                         /*
  217                          * If the incoming datagram is for MLD, allow it
  218                          * through unconditionally to the raw socket.
  219                          *
  220                          * Use the M_RTALERT_MLD flag to check for MLD
  221                          * traffic without having to inspect the mbuf chain
  222                          * more deeply, as all MLDv1/v2 host messages MUST
  223                          * contain the Router Alert option.
  224                          *
  225                          * In the case of MLDv1, we may not have explicitly
  226                          * joined the group, and may have set IFF_ALLMULTI
  227                          * on the interface. im6o_mc_filter() may discard
  228                          * control traffic we actually need to see.
  229                          *
  230                          * Userland multicast routing daemons should continue
  231                          * filter the control traffic appropriately.
  232                          */
  233                         int blocked;
  234 
  235                         blocked = MCAST_PASS;
  236                         if ((m->m_flags & M_RTALERT_MLD) == 0) {
  237                                 struct sockaddr_in6 mcaddr;
  238 
  239                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
  240                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
  241                                 mcaddr.sin6_family = AF_INET6;
  242                                 mcaddr.sin6_addr = ip6->ip6_dst;
  243 
  244                                 blocked = im6o_mc_filter(in6p->in6p_moptions,
  245                                     ifp,
  246                                     (struct sockaddr *)&mcaddr,
  247                                     (struct sockaddr *)&fromsa);
  248                         }
  249                         if (blocked != MCAST_PASS) {
  250                                 IP6STAT_INC(ip6s_notmember);
  251                                 INP_RUNLOCK(in6p);
  252                                 continue;
  253                         }
  254                 }
  255                 if (last != NULL) {
  256                         struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
  257 
  258 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
  259                         /*
  260                          * Check AH/ESP integrity.
  261                          */
  262                         if (IPSEC_ENABLED(ipv6)) {
  263                                 if (n != NULL &&
  264                                     IPSEC_CHECK_POLICY(ipv6, n, last) != 0) {
  265                                         m_freem(n);
  266                                         /* Do not inject data into pcb. */
  267                                         n = NULL;
  268                                 }
  269                         }
  270 #endif /* IPSEC */
  271                         if (n) {
  272                                 if (last->inp_flags & INP_CONTROLOPTS ||
  273                                     last->inp_socket->so_options & SO_TIMESTAMP)
  274                                         ip6_savecontrol(last, n, &opts);
  275                                 /* strip intermediate headers */
  276                                 m_adj(n, *offp);
  277                                 if (sbappendaddr(&last->inp_socket->so_rcv,
  278                                                 (struct sockaddr *)&fromsa,
  279                                                  n, opts) == 0) {
  280                                         m_freem(n);
  281                                         if (opts)
  282                                                 m_freem(opts);
  283                                         RIP6STAT_INC(rip6s_fullsock);
  284                                 } else
  285                                         sorwakeup(last->inp_socket);
  286                                 opts = NULL;
  287                         }
  288                         INP_RUNLOCK(last);
  289                 }
  290                 last = in6p;
  291         }
  292         INP_INFO_RUNLOCK(&V_ripcbinfo);
  293 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
  294         /*
  295          * Check AH/ESP integrity.
  296          */
  297         if (IPSEC_ENABLED(ipv6) && last != NULL &&
  298             IPSEC_CHECK_POLICY(ipv6, m, last) != 0) {
  299                 m_freem(m);
  300                 IP6STAT_DEC(ip6s_delivered);
  301                 /* Do not inject data into pcb. */
  302                 INP_RUNLOCK(last);
  303         } else
  304 #endif /* IPSEC */
  305         if (last != NULL) {
  306                 if (last->inp_flags & INP_CONTROLOPTS ||
  307                     last->inp_socket->so_options & SO_TIMESTAMP)
  308                         ip6_savecontrol(last, m, &opts);
  309                 /* Strip intermediate headers. */
  310                 m_adj(m, *offp);
  311                 if (sbappendaddr(&last->inp_socket->so_rcv,
  312                     (struct sockaddr *)&fromsa, m, opts) == 0) {
  313                         m_freem(m);
  314                         if (opts)
  315                                 m_freem(opts);
  316                         RIP6STAT_INC(rip6s_fullsock);
  317                 } else
  318                         sorwakeup(last->inp_socket);
  319                 INP_RUNLOCK(last);
  320         } else {
  321                 RIP6STAT_INC(rip6s_nosock);
  322                 if (m->m_flags & M_MCAST)
  323                         RIP6STAT_INC(rip6s_nosockmcast);
  324                 if (proto == IPPROTO_NONE)
  325                         m_freem(m);
  326                 else {
  327                         char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
  328                         icmp6_error(m, ICMP6_PARAM_PROB,
  329                             ICMP6_PARAMPROB_NEXTHEADER,
  330                             prvnxtp - mtod(m, char *));
  331                 }
  332                 IP6STAT_DEC(ip6s_delivered);
  333         }
  334         return (IPPROTO_DONE);
  335 }
  336 
  337 void
  338 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d)
  339 {
  340         struct ip6_hdr *ip6;
  341         struct mbuf *m;
  342         int off = 0;
  343         struct ip6ctlparam *ip6cp = NULL;
  344         const struct sockaddr_in6 *sa6_src = NULL;
  345         void *cmdarg;
  346         struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange;
  347 
  348         if (sa->sa_family != AF_INET6 ||
  349             sa->sa_len != sizeof(struct sockaddr_in6))
  350                 return;
  351 
  352         if ((unsigned)cmd >= PRC_NCMDS)
  353                 return;
  354         if (PRC_IS_REDIRECT(cmd))
  355                 notify = in6_rtchange, d = NULL;
  356         else if (cmd == PRC_HOSTDEAD)
  357                 d = NULL;
  358         else if (inet6ctlerrmap[cmd] == 0)
  359                 return;
  360 
  361         /*
  362          * If the parameter is from icmp6, decode it.
  363          */
  364         if (d != NULL) {
  365                 ip6cp = (struct ip6ctlparam *)d;
  366                 m = ip6cp->ip6c_m;
  367                 ip6 = ip6cp->ip6c_ip6;
  368                 off = ip6cp->ip6c_off;
  369                 cmdarg = ip6cp->ip6c_cmdarg;
  370                 sa6_src = ip6cp->ip6c_src;
  371         } else {
  372                 m = NULL;
  373                 ip6 = NULL;
  374                 cmdarg = NULL;
  375                 sa6_src = &sa6_any;
  376         }
  377 
  378         (void) in6_pcbnotify(&V_ripcbinfo, sa, 0,
  379             (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
  380 }
  381 
  382 /*
  383  * Generate IPv6 header and pass packet to ip6_output.  Tack on options user
  384  * may have setup with control call.
  385  */
  386 int
  387 rip6_output(struct mbuf *m, struct socket *so, ...)
  388 {
  389         struct mbuf *control;
  390         struct m_tag *mtag;
  391         struct sockaddr_in6 *dstsock;
  392         struct in6_addr *dst;
  393         struct ip6_hdr *ip6;
  394         struct inpcb *in6p;
  395         u_int   plen = m->m_pkthdr.len;
  396         int error = 0;
  397         struct ip6_pktopts opt, *optp;
  398         struct ifnet *oifp = NULL;
  399         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
  400         int scope_ambiguous = 0;
  401         int use_defzone = 0;
  402         int hlim = 0;
  403         struct in6_addr in6a;
  404         va_list ap;
  405 
  406         va_start(ap, so);
  407         dstsock = va_arg(ap, struct sockaddr_in6 *);
  408         control = va_arg(ap, struct mbuf *);
  409         va_end(ap);
  410 
  411         in6p = sotoinpcb(so);
  412         INP_WLOCK(in6p);
  413 
  414         dst = &dstsock->sin6_addr;
  415         if (control != NULL) {
  416                 if ((error = ip6_setpktopts(control, &opt,
  417                     in6p->in6p_outputopts, so->so_cred,
  418                     so->so_proto->pr_protocol)) != 0) {
  419                         goto bad;
  420                 }
  421                 optp = &opt;
  422         } else
  423                 optp = in6p->in6p_outputopts;
  424 
  425         /*
  426          * Check and convert scope zone ID into internal form.
  427          *
  428          * XXX: we may still need to determine the zone later.
  429          */
  430         if (!(so->so_state & SS_ISCONNECTED)) {
  431                 if (!optp || !optp->ip6po_pktinfo ||
  432                     !optp->ip6po_pktinfo->ipi6_ifindex)
  433                         use_defzone = V_ip6_use_defzone;
  434                 if (dstsock->sin6_scope_id == 0 && !use_defzone)
  435                         scope_ambiguous = 1;
  436                 if ((error = sa6_embedscope(dstsock, use_defzone)) != 0)
  437                         goto bad;
  438         }
  439 
  440         /*
  441          * For an ICMPv6 packet, we should know its type and code to update
  442          * statistics.
  443          */
  444         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  445                 struct icmp6_hdr *icmp6;
  446                 if (m->m_len < sizeof(struct icmp6_hdr) &&
  447                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
  448                         error = ENOBUFS;
  449                         goto bad;
  450                 }
  451                 icmp6 = mtod(m, struct icmp6_hdr *);
  452                 type = icmp6->icmp6_type;
  453                 code = icmp6->icmp6_code;
  454         }
  455 
  456         M_PREPEND(m, sizeof(*ip6), M_NOWAIT);
  457         if (m == NULL) {
  458                 error = ENOBUFS;
  459                 goto bad;
  460         }
  461         ip6 = mtod(m, struct ip6_hdr *);
  462 
  463         /*
  464          * Source address selection.
  465          */
  466         error = in6_selectsrc_socket(dstsock, optp, in6p, so->so_cred,
  467             scope_ambiguous, &in6a, &hlim);
  468 
  469         if (error)
  470                 goto bad;
  471         error = prison_check_ip6(in6p->inp_cred, &in6a);
  472         if (error != 0)
  473                 goto bad;
  474         ip6->ip6_src = in6a;
  475 
  476         ip6->ip6_dst = dstsock->sin6_addr;
  477 
  478         /*
  479          * Fill in the rest of the IPv6 header fields.
  480          */
  481         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
  482             (in6p->inp_flow & IPV6_FLOWINFO_MASK);
  483         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
  484             (IPV6_VERSION & IPV6_VERSION_MASK);
  485 
  486         /*
  487          * ip6_plen will be filled in ip6_output, so not fill it here.
  488          */
  489         ip6->ip6_nxt = in6p->inp_ip_p;
  490         ip6->ip6_hlim = hlim;
  491 
  492         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
  493             in6p->in6p_cksum != -1) {
  494                 struct mbuf *n;
  495                 int off;
  496                 u_int16_t *p;
  497 
  498                 /* Compute checksum. */
  499                 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
  500                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
  501                 else
  502                         off = in6p->in6p_cksum;
  503                 if (plen < off + 1) {
  504                         error = EINVAL;
  505                         goto bad;
  506                 }
  507                 off += sizeof(struct ip6_hdr);
  508 
  509                 n = m;
  510                 while (n && n->m_len <= off) {
  511                         off -= n->m_len;
  512                         n = n->m_next;
  513                 }
  514                 if (!n)
  515                         goto bad;
  516                 p = (u_int16_t *)(mtod(n, caddr_t) + off);
  517                 *p = 0;
  518                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
  519         }
  520 
  521         /*
  522          * Send RA/RS messages to user land for protection, before sending
  523          * them to rtadvd/rtsol.
  524          */
  525         if ((send_sendso_input_hook != NULL) &&
  526             so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  527                 switch (type) {
  528                 case ND_ROUTER_ADVERT:
  529                 case ND_ROUTER_SOLICIT:
  530                         mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
  531                                 sizeof(unsigned short), M_NOWAIT);
  532                         if (mtag == NULL)
  533                                 goto bad;
  534                         m_tag_prepend(m, mtag);
  535                 }
  536         }
  537 
  538         error = ip6_output(m, optp, NULL, 0, in6p->in6p_moptions, &oifp, in6p);
  539         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  540                 if (oifp)
  541                         icmp6_ifoutstat_inc(oifp, type, code);
  542                 ICMP6STAT_INC(icp6s_outhist[type]);
  543         } else
  544                 RIP6STAT_INC(rip6s_opackets);
  545 
  546         goto freectl;
  547 
  548  bad:
  549         if (m)
  550                 m_freem(m);
  551 
  552  freectl:
  553         if (control != NULL) {
  554                 ip6_clearpktopts(&opt, -1);
  555                 m_freem(control);
  556         }
  557         INP_WUNLOCK(in6p);
  558         return (error);
  559 }
  560 
  561 /*
  562  * Raw IPv6 socket option processing.
  563  */
  564 int
  565 rip6_ctloutput(struct socket *so, struct sockopt *sopt)
  566 {
  567         struct inpcb *inp;
  568         int error;
  569 
  570         if (sopt->sopt_level == IPPROTO_ICMPV6)
  571                 /*
  572                  * XXX: is it better to call icmp6_ctloutput() directly
  573                  * from protosw?
  574                  */
  575                 return (icmp6_ctloutput(so, sopt));
  576         else if (sopt->sopt_level != IPPROTO_IPV6) {
  577                 if (sopt->sopt_level == SOL_SOCKET &&
  578                     sopt->sopt_name == SO_SETFIB) {
  579                         inp = sotoinpcb(so);
  580                         INP_WLOCK(inp);
  581                         inp->inp_inc.inc_fibnum = so->so_fibnum;
  582                         INP_WUNLOCK(inp);
  583                         return (0);
  584                 }
  585                 return (EINVAL);
  586         }
  587 
  588         error = 0;
  589 
  590         switch (sopt->sopt_dir) {
  591         case SOPT_GET:
  592                 switch (sopt->sopt_name) {
  593                 case MRT6_INIT:
  594                 case MRT6_DONE:
  595                 case MRT6_ADD_MIF:
  596                 case MRT6_DEL_MIF:
  597                 case MRT6_ADD_MFC:
  598                 case MRT6_DEL_MFC:
  599                 case MRT6_PIM:
  600                         error = ip6_mrouter_get ?  ip6_mrouter_get(so, sopt) :
  601                             EOPNOTSUPP;
  602                         break;
  603                 case IPV6_CHECKSUM:
  604                         error = ip6_raw_ctloutput(so, sopt);
  605                         break;
  606                 default:
  607                         error = ip6_ctloutput(so, sopt);
  608                         break;
  609                 }
  610                 break;
  611 
  612         case SOPT_SET:
  613                 switch (sopt->sopt_name) {
  614                 case MRT6_INIT:
  615                 case MRT6_DONE:
  616                 case MRT6_ADD_MIF:
  617                 case MRT6_DEL_MIF:
  618                 case MRT6_ADD_MFC:
  619                 case MRT6_DEL_MFC:
  620                 case MRT6_PIM:
  621                         error = ip6_mrouter_set ?  ip6_mrouter_set(so, sopt) :
  622                             EOPNOTSUPP;
  623                         break;
  624                 case IPV6_CHECKSUM:
  625                         error = ip6_raw_ctloutput(so, sopt);
  626                         break;
  627                 default:
  628                         error = ip6_ctloutput(so, sopt);
  629                         break;
  630                 }
  631                 break;
  632         }
  633 
  634         return (error);
  635 }
  636 
  637 static int
  638 rip6_attach(struct socket *so, int proto, struct thread *td)
  639 {
  640         struct inpcb *inp;
  641         struct icmp6_filter *filter;
  642         int error;
  643 
  644         inp = sotoinpcb(so);
  645         KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
  646 
  647         error = priv_check(td, PRIV_NETINET_RAW);
  648         if (error)
  649                 return (error);
  650         error = soreserve(so, rip_sendspace, rip_recvspace);
  651         if (error)
  652                 return (error);
  653         filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
  654         if (filter == NULL)
  655                 return (ENOMEM);
  656         INP_INFO_WLOCK(&V_ripcbinfo);
  657         error = in_pcballoc(so, &V_ripcbinfo);
  658         if (error) {
  659                 INP_INFO_WUNLOCK(&V_ripcbinfo);
  660                 free(filter, M_PCB);
  661                 return (error);
  662         }
  663         inp = (struct inpcb *)so->so_pcb;
  664         INP_INFO_WUNLOCK(&V_ripcbinfo);
  665         inp->inp_vflag |= INP_IPV6;
  666         inp->inp_ip_p = (long)proto;
  667         inp->in6p_hops = -1;    /* use kernel default */
  668         inp->in6p_cksum = -1;
  669         inp->in6p_icmp6filt = filter;
  670         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
  671         INP_WUNLOCK(inp);
  672         return (0);
  673 }
  674 
  675 static void
  676 rip6_detach(struct socket *so)
  677 {
  678         struct inpcb *inp;
  679 
  680         inp = sotoinpcb(so);
  681         KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
  682 
  683         if (so == V_ip6_mrouter && ip6_mrouter_done)
  684                 ip6_mrouter_done();
  685         /* xxx: RSVP */
  686         INP_INFO_WLOCK(&V_ripcbinfo);
  687         INP_WLOCK(inp);
  688         free(inp->in6p_icmp6filt, M_PCB);
  689         in_pcbdetach(inp);
  690         in_pcbfree(inp);
  691         INP_INFO_WUNLOCK(&V_ripcbinfo);
  692 }
  693 
  694 /* XXXRW: This can't ever be called. */
  695 static void
  696 rip6_abort(struct socket *so)
  697 {
  698         struct inpcb *inp;
  699 
  700         inp = sotoinpcb(so);
  701         KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
  702 
  703         soisdisconnected(so);
  704 }
  705 
  706 static void
  707 rip6_close(struct socket *so)
  708 {
  709         struct inpcb *inp;
  710 
  711         inp = sotoinpcb(so);
  712         KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
  713 
  714         soisdisconnected(so);
  715 }
  716 
  717 static int
  718 rip6_disconnect(struct socket *so)
  719 {
  720         struct inpcb *inp;
  721 
  722         inp = sotoinpcb(so);
  723         KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
  724 
  725         if ((so->so_state & SS_ISCONNECTED) == 0)
  726                 return (ENOTCONN);
  727         inp->in6p_faddr = in6addr_any;
  728         rip6_abort(so);
  729         return (0);
  730 }
  731 
  732 static int
  733 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  734 {
  735         struct inpcb *inp;
  736         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  737         struct ifaddr *ifa = NULL;
  738         int error = 0;
  739 
  740         inp = sotoinpcb(so);
  741         KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
  742 
  743         if (nam->sa_len != sizeof(*addr))
  744                 return (EINVAL);
  745         if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
  746                 return (error);
  747         if (TAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
  748                 return (EADDRNOTAVAIL);
  749         if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
  750                 return (error);
  751 
  752         if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
  753             (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL)
  754                 return (EADDRNOTAVAIL);
  755         if (ifa != NULL &&
  756             ((struct in6_ifaddr *)ifa)->ia6_flags &
  757             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
  758              IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
  759                 ifa_free(ifa);
  760                 return (EADDRNOTAVAIL);
  761         }
  762         if (ifa != NULL)
  763                 ifa_free(ifa);
  764         INP_INFO_WLOCK(&V_ripcbinfo);
  765         INP_WLOCK(inp);
  766         inp->in6p_laddr = addr->sin6_addr;
  767         INP_WUNLOCK(inp);
  768         INP_INFO_WUNLOCK(&V_ripcbinfo);
  769         return (0);
  770 }
  771 
  772 static int
  773 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  774 {
  775         struct inpcb *inp;
  776         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  777         struct in6_addr in6a;
  778         int error = 0, scope_ambiguous = 0;
  779 
  780         inp = sotoinpcb(so);
  781         KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
  782 
  783         if (nam->sa_len != sizeof(*addr))
  784                 return (EINVAL);
  785         if (TAILQ_EMPTY(&V_ifnet))
  786                 return (EADDRNOTAVAIL);
  787         if (addr->sin6_family != AF_INET6)
  788                 return (EAFNOSUPPORT);
  789 
  790         /*
  791          * Application should provide a proper zone ID or the use of default
  792          * zone IDs should be enabled.  Unfortunately, some applications do
  793          * not behave as it should, so we need a workaround.  Even if an
  794          * appropriate ID is not determined, we'll see if we can determine
  795          * the outgoing interface.  If we can, determine the zone ID based on
  796          * the interface below.
  797          */
  798         if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
  799                 scope_ambiguous = 1;
  800         if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
  801                 return (error);
  802 
  803         INP_INFO_WLOCK(&V_ripcbinfo);
  804         INP_WLOCK(inp);
  805         /* Source address selection. XXX: need pcblookup? */
  806         error = in6_selectsrc_socket(addr, inp->in6p_outputopts,
  807             inp, so->so_cred, scope_ambiguous, &in6a, NULL);
  808         if (error) {
  809                 INP_WUNLOCK(inp);
  810                 INP_INFO_WUNLOCK(&V_ripcbinfo);
  811                 return (error);
  812         }
  813 
  814         inp->in6p_faddr = addr->sin6_addr;
  815         inp->in6p_laddr = in6a;
  816         soisconnected(so);
  817         INP_WUNLOCK(inp);
  818         INP_INFO_WUNLOCK(&V_ripcbinfo);
  819         return (0);
  820 }
  821 
  822 static int
  823 rip6_shutdown(struct socket *so)
  824 {
  825         struct inpcb *inp;
  826 
  827         inp = sotoinpcb(so);
  828         KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL"));
  829 
  830         INP_WLOCK(inp);
  831         socantsendmore(so);
  832         INP_WUNLOCK(inp);
  833         return (0);
  834 }
  835 
  836 static int
  837 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  838     struct mbuf *control, struct thread *td)
  839 {
  840         struct inpcb *inp;
  841         struct sockaddr_in6 tmp;
  842         struct sockaddr_in6 *dst;
  843         int ret;
  844 
  845         inp = sotoinpcb(so);
  846         KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
  847 
  848         /* Always copy sockaddr to avoid overwrites. */
  849         /* Unlocked read. */
  850         if (so->so_state & SS_ISCONNECTED) {
  851                 if (nam) {
  852                         m_freem(m);
  853                         return (EISCONN);
  854                 }
  855                 /* XXX */
  856                 bzero(&tmp, sizeof(tmp));
  857                 tmp.sin6_family = AF_INET6;
  858                 tmp.sin6_len = sizeof(struct sockaddr_in6);
  859                 INP_RLOCK(inp);
  860                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
  861                     sizeof(struct in6_addr));
  862                 INP_RUNLOCK(inp);
  863                 dst = &tmp;
  864         } else {
  865                 if (nam == NULL) {
  866                         m_freem(m);
  867                         return (ENOTCONN);
  868                 }
  869                 if (nam->sa_len != sizeof(struct sockaddr_in6)) {
  870                         m_freem(m);
  871                         return (EINVAL);
  872                 }
  873                 tmp = *(struct sockaddr_in6 *)nam;
  874                 dst = &tmp;
  875 
  876                 if (dst->sin6_family == AF_UNSPEC) {
  877                         /*
  878                          * XXX: we allow this case for backward
  879                          * compatibility to buggy applications that
  880                          * rely on old (and wrong) kernel behavior.
  881                          */
  882                         log(LOG_INFO, "rip6 SEND: address family is "
  883                             "unspec. Assume AF_INET6\n");
  884                         dst->sin6_family = AF_INET6;
  885                 } else if (dst->sin6_family != AF_INET6) {
  886                         m_freem(m);
  887                         return(EAFNOSUPPORT);
  888                 }
  889         }
  890         ret = rip6_output(m, so, dst, control);
  891         return (ret);
  892 }
  893 
  894 struct pr_usrreqs rip6_usrreqs = {
  895         .pru_abort =            rip6_abort,
  896         .pru_attach =           rip6_attach,
  897         .pru_bind =             rip6_bind,
  898         .pru_connect =          rip6_connect,
  899         .pru_control =          in6_control,
  900         .pru_detach =           rip6_detach,
  901         .pru_disconnect =       rip6_disconnect,
  902         .pru_peeraddr =         in6_getpeeraddr,
  903         .pru_send =             rip6_send,
  904         .pru_shutdown =         rip6_shutdown,
  905         .pru_sockaddr =         in6_getsockaddr,
  906         .pru_close =            rip6_close,
  907 };

Cache object: 9a8730b0bcdf8021dcb29a31ee86c46c


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.