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  * 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 355870 2019-12-18 00:12:30Z 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 *inp;
  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(inp, &V_ripcb, inp_list) {
  178                 /* XXX inp locking */
  179                 if ((inp->inp_vflag & INP_IPV6) == 0)
  180                         continue;
  181                 if (inp->inp_ip_p &&
  182                     inp->inp_ip_p != proto)
  183                         continue;
  184                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
  185                     !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ip6->ip6_dst))
  186                         continue;
  187                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
  188                     !IN6_ARE_ADDR_EQUAL(&inp->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(inp);
  227                 if (__predict_false(inp->inp_flags2 & INP_FREED))
  228                         goto skip_2;
  229                 if (jailed_without_vnet(inp->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(inp->inp_cred,
  237                             &ip6->ip6_dst) != 0)
  238                                 goto skip_2;
  239                 }
  240                 if (inp->in6p_cksum != -1) {
  241                         RIP6STAT_INC(rip6s_isum);
  242                         if (m->m_pkthdr.len - (*offp + inp->in6p_cksum) < 2 ||
  243                             in6_cksum(m, proto, *offp,
  244                             m->m_pkthdr.len - *offp)) {
  245                                 RIP6STAT_INC(rip6s_badsum);
  246                                 /*
  247                                  * Drop the received message, don't send an
  248                                  * ICMP6 message. Set proto to IPPROTO_NONE
  249                                  * to achieve that.
  250                                  */
  251                                 proto = IPPROTO_NONE;
  252                                 goto skip_2;
  253                         }
  254                 }
  255                 /*
  256                  * If this raw socket has multicast state, and we
  257                  * have received a multicast, check if this socket
  258                  * should receive it, as multicast filtering is now
  259                  * the responsibility of the transport layer.
  260                  */
  261                 if (inp->in6p_moptions &&
  262                     IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  263                         /*
  264                          * If the incoming datagram is for MLD, allow it
  265                          * through unconditionally to the raw socket.
  266                          *
  267                          * Use the M_RTALERT_MLD flag to check for MLD
  268                          * traffic without having to inspect the mbuf chain
  269                          * more deeply, as all MLDv1/v2 host messages MUST
  270                          * contain the Router Alert option.
  271                          *
  272                          * In the case of MLDv1, we may not have explicitly
  273                          * joined the group, and may have set IFF_ALLMULTI
  274                          * on the interface. im6o_mc_filter() may discard
  275                          * control traffic we actually need to see.
  276                          *
  277                          * Userland multicast routing daemons should continue
  278                          * filter the control traffic appropriately.
  279                          */
  280                         int blocked;
  281 
  282                         blocked = MCAST_PASS;
  283                         if ((m->m_flags & M_RTALERT_MLD) == 0) {
  284                                 struct sockaddr_in6 mcaddr;
  285 
  286                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
  287                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
  288                                 mcaddr.sin6_family = AF_INET6;
  289                                 mcaddr.sin6_addr = ip6->ip6_dst;
  290 
  291                                 blocked = im6o_mc_filter(inp->in6p_moptions,
  292                                     ifp,
  293                                     (struct sockaddr *)&mcaddr,
  294                                     (struct sockaddr *)&fromsa);
  295                         }
  296                         if (blocked != MCAST_PASS) {
  297                                 IP6STAT_INC(ip6s_notmember);
  298                                 goto skip_2;
  299                         }
  300                 }
  301                 last = inp;
  302                 continue;
  303 skip_2:
  304                 INP_RUNLOCK(inp);
  305         }
  306         INP_INFO_RUNLOCK_ET(&V_ripcbinfo, et);
  307 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
  308         /*
  309          * Check AH/ESP integrity.
  310          */
  311         if (IPSEC_ENABLED(ipv6) && last != NULL &&
  312             IPSEC_CHECK_POLICY(ipv6, m, last) != 0) {
  313                 m_freem(m);
  314                 IP6STAT_DEC(ip6s_delivered);
  315                 /* Do not inject data into pcb. */
  316                 INP_RUNLOCK(last);
  317         } else
  318 #endif /* IPSEC */
  319         if (last != NULL) {
  320                 if (last->inp_flags & INP_CONTROLOPTS ||
  321                     last->inp_socket->so_options & SO_TIMESTAMP)
  322                         ip6_savecontrol(last, m, &opts);
  323                 /* Strip intermediate headers. */
  324                 m_adj(m, *offp);
  325                 if (sbappendaddr(&last->inp_socket->so_rcv,
  326                     (struct sockaddr *)&fromsa, m, opts) == 0) {
  327                         m_freem(m);
  328                         if (opts)
  329                                 m_freem(opts);
  330                         RIP6STAT_INC(rip6s_fullsock);
  331                 } else
  332                         sorwakeup(last->inp_socket);
  333                 INP_RUNLOCK(last);
  334         } else {
  335                 RIP6STAT_INC(rip6s_nosock);
  336                 if (m->m_flags & M_MCAST)
  337                         RIP6STAT_INC(rip6s_nosockmcast);
  338                 if (proto == IPPROTO_NONE)
  339                         m_freem(m);
  340                 else
  341                         icmp6_error(m, ICMP6_PARAM_PROB,
  342                             ICMP6_PARAMPROB_NEXTHEADER,
  343                             ip6_get_prevhdr(m, *offp));
  344                 IP6STAT_DEC(ip6s_delivered);
  345         }
  346         return (IPPROTO_DONE);
  347 }
  348 
  349 void
  350 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d)
  351 {
  352         struct ip6ctlparam *ip6cp = NULL;
  353         const struct sockaddr_in6 *sa6_src = NULL;
  354         void *cmdarg;
  355         struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange;
  356 
  357         if (sa->sa_family != AF_INET6 ||
  358             sa->sa_len != sizeof(struct sockaddr_in6))
  359                 return;
  360 
  361         if ((unsigned)cmd >= PRC_NCMDS)
  362                 return;
  363         if (PRC_IS_REDIRECT(cmd))
  364                 notify = in6_rtchange, d = NULL;
  365         else if (cmd == PRC_HOSTDEAD)
  366                 d = NULL;
  367         else if (inet6ctlerrmap[cmd] == 0)
  368                 return;
  369 
  370         /*
  371          * If the parameter is from icmp6, decode it.
  372          */
  373         if (d != NULL) {
  374                 ip6cp = (struct ip6ctlparam *)d;
  375                 cmdarg = ip6cp->ip6c_cmdarg;
  376                 sa6_src = ip6cp->ip6c_src;
  377         } else {
  378                 cmdarg = NULL;
  379                 sa6_src = &sa6_any;
  380         }
  381 
  382         (void) in6_pcbnotify(&V_ripcbinfo, sa, 0,
  383             (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
  384 }
  385 
  386 /*
  387  * Generate IPv6 header and pass packet to ip6_output.  Tack on options user
  388  * may have setup with control call.
  389  */
  390 int
  391 rip6_output(struct mbuf *m, struct socket *so, ...)
  392 {
  393         struct mbuf *control;
  394         struct m_tag *mtag;
  395         struct sockaddr_in6 *dstsock;
  396         struct ip6_hdr *ip6;
  397         struct inpcb *inp;
  398         u_int   plen = m->m_pkthdr.len;
  399         int error = 0;
  400         struct ip6_pktopts opt, *optp;
  401         struct ifnet *oifp = NULL;
  402         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
  403         int scope_ambiguous = 0;
  404         int use_defzone = 0;
  405         int hlim = 0;
  406         struct in6_addr in6a;
  407         va_list ap;
  408 
  409         va_start(ap, so);
  410         dstsock = va_arg(ap, struct sockaddr_in6 *);
  411         control = va_arg(ap, struct mbuf *);
  412         va_end(ap);
  413 
  414         inp = sotoinpcb(so);
  415         INP_WLOCK(inp);
  416 
  417         if (control != NULL) {
  418                 if ((error = ip6_setpktopts(control, &opt,
  419                     inp->in6p_outputopts, so->so_cred,
  420                     so->so_proto->pr_protocol)) != 0) {
  421                         goto bad;
  422                 }
  423                 optp = &opt;
  424         } else
  425                 optp = inp->in6p_outputopts;
  426 
  427         /*
  428          * Check and convert scope zone ID into internal form.
  429          *
  430          * XXX: we may still need to determine the zone later.
  431          */
  432         if (!(so->so_state & SS_ISCONNECTED)) {
  433                 if (!optp || !optp->ip6po_pktinfo ||
  434                     !optp->ip6po_pktinfo->ipi6_ifindex)
  435                         use_defzone = V_ip6_use_defzone;
  436                 if (dstsock->sin6_scope_id == 0 && !use_defzone)
  437                         scope_ambiguous = 1;
  438                 if ((error = sa6_embedscope(dstsock, use_defzone)) != 0)
  439                         goto bad;
  440         }
  441 
  442         /*
  443          * For an ICMPv6 packet, we should know its type and code to update
  444          * statistics.
  445          */
  446         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  447                 struct icmp6_hdr *icmp6;
  448                 if (m->m_len < sizeof(struct icmp6_hdr) &&
  449                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
  450                         error = ENOBUFS;
  451                         goto bad;
  452                 }
  453                 icmp6 = mtod(m, struct icmp6_hdr *);
  454                 type = icmp6->icmp6_type;
  455                 code = icmp6->icmp6_code;
  456         }
  457 
  458         M_PREPEND(m, sizeof(*ip6), M_NOWAIT);
  459         if (m == NULL) {
  460                 error = ENOBUFS;
  461                 goto bad;
  462         }
  463         ip6 = mtod(m, struct ip6_hdr *);
  464 
  465         /*
  466          * Source address selection.
  467          */
  468         error = in6_selectsrc_socket(dstsock, optp, inp, so->so_cred,
  469             scope_ambiguous, &in6a, &hlim);
  470 
  471         if (error)
  472                 goto bad;
  473         error = prison_check_ip6(inp->inp_cred, &in6a);
  474         if (error != 0)
  475                 goto bad;
  476         ip6->ip6_src = in6a;
  477 
  478         ip6->ip6_dst = dstsock->sin6_addr;
  479 
  480         /*
  481          * Fill in the rest of the IPv6 header fields.
  482          */
  483         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
  484             (inp->inp_flow & IPV6_FLOWINFO_MASK);
  485         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
  486             (IPV6_VERSION & IPV6_VERSION_MASK);
  487 
  488         /*
  489          * ip6_plen will be filled in ip6_output, so not fill it here.
  490          */
  491         ip6->ip6_nxt = inp->inp_ip_p;
  492         ip6->ip6_hlim = hlim;
  493 
  494         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
  495             inp->in6p_cksum != -1) {
  496                 struct mbuf *n;
  497                 int off;
  498                 u_int16_t *p;
  499 
  500                 /* Compute checksum. */
  501                 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
  502                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
  503                 else
  504                         off = inp->in6p_cksum;
  505                 if (plen < off + 2) {
  506                         error = EINVAL;
  507                         goto bad;
  508                 }
  509                 off += sizeof(struct ip6_hdr);
  510 
  511                 n = m;
  512                 while (n && n->m_len <= off) {
  513                         off -= n->m_len;
  514                         n = n->m_next;
  515                 }
  516                 if (!n)
  517                         goto bad;
  518                 p = (u_int16_t *)(mtod(n, caddr_t) + off);
  519                 *p = 0;
  520                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
  521         }
  522 
  523         /*
  524          * Send RA/RS messages to user land for protection, before sending
  525          * them to rtadvd/rtsol.
  526          */
  527         if ((send_sendso_input_hook != NULL) &&
  528             so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  529                 switch (type) {
  530                 case ND_ROUTER_ADVERT:
  531                 case ND_ROUTER_SOLICIT:
  532                         mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
  533                                 sizeof(unsigned short), M_NOWAIT);
  534                         if (mtag == NULL)
  535                                 goto bad;
  536                         m_tag_prepend(m, mtag);
  537                 }
  538         }
  539 
  540         error = ip6_output(m, optp, NULL, 0, inp->in6p_moptions, &oifp, inp);
  541         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  542                 if (oifp)
  543                         icmp6_ifoutstat_inc(oifp, type, code);
  544                 ICMP6STAT_INC(icp6s_outhist[type]);
  545         } else
  546                 RIP6STAT_INC(rip6s_opackets);
  547 
  548         goto freectl;
  549 
  550  bad:
  551         if (m)
  552                 m_freem(m);
  553 
  554  freectl:
  555         if (control != NULL) {
  556                 ip6_clearpktopts(&opt, -1);
  557                 m_freem(control);
  558         }
  559         INP_WUNLOCK(inp);
  560         return (error);
  561 }
  562 
  563 /*
  564  * Raw IPv6 socket option processing.
  565  */
  566 int
  567 rip6_ctloutput(struct socket *so, struct sockopt *sopt)
  568 {
  569         struct inpcb *inp;
  570         int error;
  571 
  572         if (sopt->sopt_level == IPPROTO_ICMPV6)
  573                 /*
  574                  * XXX: is it better to call icmp6_ctloutput() directly
  575                  * from protosw?
  576                  */
  577                 return (icmp6_ctloutput(so, sopt));
  578         else if (sopt->sopt_level != IPPROTO_IPV6) {
  579                 if (sopt->sopt_level == SOL_SOCKET &&
  580                     sopt->sopt_name == SO_SETFIB) {
  581                         inp = sotoinpcb(so);
  582                         INP_WLOCK(inp);
  583                         inp->inp_inc.inc_fibnum = so->so_fibnum;
  584                         INP_WUNLOCK(inp);
  585                         return (0);
  586                 }
  587                 return (EINVAL);
  588         }
  589 
  590         error = 0;
  591 
  592         switch (sopt->sopt_dir) {
  593         case SOPT_GET:
  594                 switch (sopt->sopt_name) {
  595                 case MRT6_INIT:
  596                 case MRT6_DONE:
  597                 case MRT6_ADD_MIF:
  598                 case MRT6_DEL_MIF:
  599                 case MRT6_ADD_MFC:
  600                 case MRT6_DEL_MFC:
  601                 case MRT6_PIM:
  602                         error = ip6_mrouter_get ?  ip6_mrouter_get(so, sopt) :
  603                             EOPNOTSUPP;
  604                         break;
  605                 case IPV6_CHECKSUM:
  606                         error = ip6_raw_ctloutput(so, sopt);
  607                         break;
  608                 default:
  609                         error = ip6_ctloutput(so, sopt);
  610                         break;
  611                 }
  612                 break;
  613 
  614         case SOPT_SET:
  615                 switch (sopt->sopt_name) {
  616                 case MRT6_INIT:
  617                 case MRT6_DONE:
  618                 case MRT6_ADD_MIF:
  619                 case MRT6_DEL_MIF:
  620                 case MRT6_ADD_MFC:
  621                 case MRT6_DEL_MFC:
  622                 case MRT6_PIM:
  623                         error = ip6_mrouter_set ?  ip6_mrouter_set(so, sopt) :
  624                             EOPNOTSUPP;
  625                         break;
  626                 case IPV6_CHECKSUM:
  627                         error = ip6_raw_ctloutput(so, sopt);
  628                         break;
  629                 default:
  630                         error = ip6_ctloutput(so, sopt);
  631                         break;
  632                 }
  633                 break;
  634         }
  635 
  636         return (error);
  637 }
  638 
  639 static int
  640 rip6_attach(struct socket *so, int proto, struct thread *td)
  641 {
  642         struct inpcb *inp;
  643         struct icmp6_filter *filter;
  644         int error;
  645 
  646         inp = sotoinpcb(so);
  647         KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
  648 
  649         error = priv_check(td, PRIV_NETINET_RAW);
  650         if (error)
  651                 return (error);
  652         error = soreserve(so, rip_sendspace, rip_recvspace);
  653         if (error)
  654                 return (error);
  655         filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
  656         if (filter == NULL)
  657                 return (ENOMEM);
  658         INP_INFO_WLOCK(&V_ripcbinfo);
  659         error = in_pcballoc(so, &V_ripcbinfo);
  660         if (error) {
  661                 INP_INFO_WUNLOCK(&V_ripcbinfo);
  662                 free(filter, M_PCB);
  663                 return (error);
  664         }
  665         inp = (struct inpcb *)so->so_pcb;
  666         INP_INFO_WUNLOCK(&V_ripcbinfo);
  667         inp->inp_vflag |= INP_IPV6;
  668         inp->inp_ip_p = (long)proto;
  669         inp->in6p_hops = -1;    /* use kernel default */
  670         inp->in6p_cksum = -1;
  671         inp->in6p_icmp6filt = filter;
  672         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
  673         INP_WUNLOCK(inp);
  674         return (0);
  675 }
  676 
  677 static void
  678 rip6_detach(struct socket *so)
  679 {
  680         struct inpcb *inp;
  681 
  682         inp = sotoinpcb(so);
  683         KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
  684 
  685         if (so == V_ip6_mrouter && ip6_mrouter_done)
  686                 ip6_mrouter_done();
  687         /* xxx: RSVP */
  688         INP_INFO_WLOCK(&V_ripcbinfo);
  689         INP_WLOCK(inp);
  690         free(inp->in6p_icmp6filt, M_PCB);
  691         in_pcbdetach(inp);
  692         in_pcbfree(inp);
  693         INP_INFO_WUNLOCK(&V_ripcbinfo);
  694 }
  695 
  696 /* XXXRW: This can't ever be called. */
  697 static void
  698 rip6_abort(struct socket *so)
  699 {
  700         struct inpcb *inp;
  701 
  702         inp = sotoinpcb(so);
  703         KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
  704 
  705         soisdisconnected(so);
  706 }
  707 
  708 static void
  709 rip6_close(struct socket *so)
  710 {
  711         struct inpcb *inp;
  712 
  713         inp = sotoinpcb(so);
  714         KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
  715 
  716         soisdisconnected(so);
  717 }
  718 
  719 static int
  720 rip6_disconnect(struct socket *so)
  721 {
  722         struct inpcb *inp;
  723 
  724         inp = sotoinpcb(so);
  725         KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
  726 
  727         if ((so->so_state & SS_ISCONNECTED) == 0)
  728                 return (ENOTCONN);
  729         inp->in6p_faddr = in6addr_any;
  730         rip6_abort(so);
  731         return (0);
  732 }
  733 
  734 static int
  735 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  736 {
  737         struct inpcb *inp;
  738         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  739         struct ifaddr *ifa = NULL;
  740         int error = 0;
  741 
  742         inp = sotoinpcb(so);
  743         KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
  744 
  745         if (nam->sa_len != sizeof(*addr))
  746                 return (EINVAL);
  747         if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
  748                 return (error);
  749         if (CK_STAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
  750                 return (EADDRNOTAVAIL);
  751         if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
  752                 return (error);
  753 
  754         NET_EPOCH_ENTER();
  755         if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
  756             (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL) {
  757                 NET_EPOCH_EXIT();
  758                 return (EADDRNOTAVAIL);
  759         }
  760         if (ifa != NULL &&
  761             ((struct in6_ifaddr *)ifa)->ia6_flags &
  762             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
  763              IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
  764                 NET_EPOCH_EXIT();
  765                 return (EADDRNOTAVAIL);
  766         }
  767         NET_EPOCH_EXIT();
  768         INP_INFO_WLOCK(&V_ripcbinfo);
  769         INP_WLOCK(inp);
  770         inp->in6p_laddr = addr->sin6_addr;
  771         INP_WUNLOCK(inp);
  772         INP_INFO_WUNLOCK(&V_ripcbinfo);
  773         return (0);
  774 }
  775 
  776 static int
  777 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  778 {
  779         struct inpcb *inp;
  780         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  781         struct in6_addr in6a;
  782         int error = 0, scope_ambiguous = 0;
  783 
  784         inp = sotoinpcb(so);
  785         KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
  786 
  787         if (nam->sa_len != sizeof(*addr))
  788                 return (EINVAL);
  789         if (CK_STAILQ_EMPTY(&V_ifnet))
  790                 return (EADDRNOTAVAIL);
  791         if (addr->sin6_family != AF_INET6)
  792                 return (EAFNOSUPPORT);
  793 
  794         /*
  795          * Application should provide a proper zone ID or the use of default
  796          * zone IDs should be enabled.  Unfortunately, some applications do
  797          * not behave as it should, so we need a workaround.  Even if an
  798          * appropriate ID is not determined, we'll see if we can determine
  799          * the outgoing interface.  If we can, determine the zone ID based on
  800          * the interface below.
  801          */
  802         if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
  803                 scope_ambiguous = 1;
  804         if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
  805                 return (error);
  806 
  807         INP_INFO_WLOCK(&V_ripcbinfo);
  808         INP_WLOCK(inp);
  809         /* Source address selection. XXX: need pcblookup? */
  810         error = in6_selectsrc_socket(addr, inp->in6p_outputopts,
  811             inp, so->so_cred, scope_ambiguous, &in6a, NULL);
  812         if (error) {
  813                 INP_WUNLOCK(inp);
  814                 INP_INFO_WUNLOCK(&V_ripcbinfo);
  815                 return (error);
  816         }
  817 
  818         inp->in6p_faddr = addr->sin6_addr;
  819         inp->in6p_laddr = in6a;
  820         soisconnected(so);
  821         INP_WUNLOCK(inp);
  822         INP_INFO_WUNLOCK(&V_ripcbinfo);
  823         return (0);
  824 }
  825 
  826 static int
  827 rip6_shutdown(struct socket *so)
  828 {
  829         struct inpcb *inp;
  830 
  831         inp = sotoinpcb(so);
  832         KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL"));
  833 
  834         INP_WLOCK(inp);
  835         socantsendmore(so);
  836         INP_WUNLOCK(inp);
  837         return (0);
  838 }
  839 
  840 static int
  841 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  842     struct mbuf *control, struct thread *td)
  843 {
  844         struct inpcb *inp;
  845         struct sockaddr_in6 tmp;
  846         struct sockaddr_in6 *dst;
  847         int ret;
  848 
  849         inp = sotoinpcb(so);
  850         KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
  851 
  852         /* Always copy sockaddr to avoid overwrites. */
  853         /* Unlocked read. */
  854         if (so->so_state & SS_ISCONNECTED) {
  855                 if (nam) {
  856                         m_freem(m);
  857                         return (EISCONN);
  858                 }
  859                 /* XXX */
  860                 bzero(&tmp, sizeof(tmp));
  861                 tmp.sin6_family = AF_INET6;
  862                 tmp.sin6_len = sizeof(struct sockaddr_in6);
  863                 INP_RLOCK(inp);
  864                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
  865                     sizeof(struct in6_addr));
  866                 INP_RUNLOCK(inp);
  867                 dst = &tmp;
  868         } else {
  869                 if (nam == NULL) {
  870                         m_freem(m);
  871                         return (ENOTCONN);
  872                 }
  873                 if (nam->sa_len != sizeof(struct sockaddr_in6)) {
  874                         m_freem(m);
  875                         return (EINVAL);
  876                 }
  877                 tmp = *(struct sockaddr_in6 *)nam;
  878                 dst = &tmp;
  879 
  880                 if (dst->sin6_family == AF_UNSPEC) {
  881                         /*
  882                          * XXX: we allow this case for backward
  883                          * compatibility to buggy applications that
  884                          * rely on old (and wrong) kernel behavior.
  885                          */
  886                         log(LOG_INFO, "rip6 SEND: address family is "
  887                             "unspec. Assume AF_INET6\n");
  888                         dst->sin6_family = AF_INET6;
  889                 } else if (dst->sin6_family != AF_INET6) {
  890                         m_freem(m);
  891                         return(EAFNOSUPPORT);
  892                 }
  893         }
  894         ret = rip6_output(m, so, dst, control);
  895         return (ret);
  896 }
  897 
  898 struct pr_usrreqs rip6_usrreqs = {
  899         .pru_abort =            rip6_abort,
  900         .pru_attach =           rip6_attach,
  901         .pru_bind =             rip6_bind,
  902         .pru_connect =          rip6_connect,
  903         .pru_control =          in6_control,
  904         .pru_detach =           rip6_detach,
  905         .pru_disconnect =       rip6_disconnect,
  906         .pru_peeraddr =         in6_getpeeraddr,
  907         .pru_send =             rip6_send,
  908         .pru_shutdown =         rip6_shutdown,
  909         .pru_sockaddr =         in6_getsockaddr,
  910         .pru_close =            rip6_close,
  911 };

Cache object: 05ff2b6e26c2da6077f60b804653b57b


[ 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.