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

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1988, 1993
    3  *      The Regents of the University of California.
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 4. Neither the name of the University nor the names of its contributors
   15  *    may be used to endorse or promote products derived from this software
   16  *    without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  *      @(#)raw_ip.c    8.7 (Berkeley) 5/15/95
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/10.1/sys/netinet/raw_ip.c 266718 2014-05-26 22:54:15Z smh $");
   35 
   36 #include "opt_inet.h"
   37 #include "opt_inet6.h"
   38 #include "opt_ipsec.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/jail.h>
   42 #include <sys/kernel.h>
   43 #include <sys/lock.h>
   44 #include <sys/malloc.h>
   45 #include <sys/mbuf.h>
   46 #include <sys/priv.h>
   47 #include <sys/proc.h>
   48 #include <sys/protosw.h>
   49 #include <sys/rwlock.h>
   50 #include <sys/signalvar.h>
   51 #include <sys/socket.h>
   52 #include <sys/socketvar.h>
   53 #include <sys/sx.h>
   54 #include <sys/sysctl.h>
   55 #include <sys/systm.h>
   56 
   57 #include <vm/uma.h>
   58 
   59 #include <net/if.h>
   60 #include <net/route.h>
   61 #include <net/vnet.h>
   62 
   63 #include <netinet/in.h>
   64 #include <netinet/in_systm.h>
   65 #include <netinet/in_pcb.h>
   66 #include <netinet/in_var.h>
   67 #include <netinet/if_ether.h>
   68 #include <netinet/ip.h>
   69 #include <netinet/ip_var.h>
   70 #include <netinet/ip_mroute.h>
   71 
   72 #ifdef IPSEC
   73 #include <netipsec/ipsec.h>
   74 #endif /*IPSEC*/
   75 
   76 #include <security/mac/mac_framework.h>
   77 
   78 VNET_DEFINE(int, ip_defttl) = IPDEFTTL;
   79 SYSCTL_VNET_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_RW,
   80     &VNET_NAME(ip_defttl), 0,
   81     "Maximum TTL on IP packets");
   82 
   83 VNET_DEFINE(struct inpcbhead, ripcb);
   84 VNET_DEFINE(struct inpcbinfo, ripcbinfo);
   85 
   86 #define V_ripcb                 VNET(ripcb)
   87 #define V_ripcbinfo             VNET(ripcbinfo)
   88 
   89 /*
   90  * Control and data hooks for ipfw, dummynet, divert and so on.
   91  * The data hooks are not used here but it is convenient
   92  * to keep them all in one place.
   93  */
   94 VNET_DEFINE(ip_fw_chk_ptr_t, ip_fw_chk_ptr) = NULL;
   95 VNET_DEFINE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr) = NULL;
   96 
   97 int     (*ip_dn_ctl_ptr)(struct sockopt *);
   98 int     (*ip_dn_io_ptr)(struct mbuf **, int, struct ip_fw_args *);
   99 void    (*ip_divert_ptr)(struct mbuf *, int);
  100 int     (*ng_ipfw_input_p)(struct mbuf **, int,
  101                         struct ip_fw_args *, int);
  102 
  103 #ifdef INET
  104 /*
  105  * Hooks for multicast routing. They all default to NULL, so leave them not
  106  * initialized and rely on BSS being set to 0.
  107  */
  108 
  109 /*
  110  * The socket used to communicate with the multicast routing daemon.
  111  */
  112 VNET_DEFINE(struct socket *, ip_mrouter);
  113 
  114 /*
  115  * The various mrouter and rsvp functions.
  116  */
  117 int (*ip_mrouter_set)(struct socket *, struct sockopt *);
  118 int (*ip_mrouter_get)(struct socket *, struct sockopt *);
  119 int (*ip_mrouter_done)(void);
  120 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
  121                    struct ip_moptions *);
  122 int (*mrt_ioctl)(u_long, caddr_t, int);
  123 int (*legal_vif_num)(int);
  124 u_long (*ip_mcast_src)(int);
  125 
  126 void (*rsvp_input_p)(struct mbuf *m, int off);
  127 int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
  128 void (*ip_rsvp_force_done)(struct socket *);
  129 #endif /* INET */
  130 
  131 u_long  rip_sendspace = 9216;
  132 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
  133     &rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
  134 
  135 u_long  rip_recvspace = 9216;
  136 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
  137     &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams");
  138 
  139 /*
  140  * Hash functions
  141  */
  142 
  143 #define INP_PCBHASH_RAW_SIZE    256
  144 #define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \
  145         (((proto) + (laddr) + (faddr)) % (mask) + 1)
  146 
  147 #ifdef INET
  148 static void
  149 rip_inshash(struct inpcb *inp)
  150 {
  151         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
  152         struct inpcbhead *pcbhash;
  153         int hash;
  154 
  155         INP_INFO_WLOCK_ASSERT(pcbinfo);
  156         INP_WLOCK_ASSERT(inp);
  157         
  158         if (inp->inp_ip_p != 0 &&
  159             inp->inp_laddr.s_addr != INADDR_ANY &&
  160             inp->inp_faddr.s_addr != INADDR_ANY) {
  161                 hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr,
  162                     inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask);
  163         } else
  164                 hash = 0;
  165         pcbhash = &pcbinfo->ipi_hashbase[hash];
  166         LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
  167 }
  168 
  169 static void
  170 rip_delhash(struct inpcb *inp)
  171 {
  172 
  173         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
  174         INP_WLOCK_ASSERT(inp);
  175 
  176         LIST_REMOVE(inp, inp_hash);
  177 }
  178 #endif /* INET */
  179 
  180 /*
  181  * Raw interface to IP protocol.
  182  */
  183 
  184 /*
  185  * Initialize raw connection block q.
  186  */
  187 static void
  188 rip_zone_change(void *tag)
  189 {
  190 
  191         uma_zone_set_max(V_ripcbinfo.ipi_zone, maxsockets);
  192 }
  193 
  194 static int
  195 rip_inpcb_init(void *mem, int size, int flags)
  196 {
  197         struct inpcb *inp = mem;
  198 
  199         INP_LOCK_INIT(inp, "inp", "rawinp");
  200         return (0);
  201 }
  202 
  203 void
  204 rip_init(void)
  205 {
  206 
  207         in_pcbinfo_init(&V_ripcbinfo, "rip", &V_ripcb, INP_PCBHASH_RAW_SIZE,
  208             1, "ripcb", rip_inpcb_init, NULL, UMA_ZONE_NOFREE,
  209             IPI_HASHFIELDS_NONE);
  210         EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, NULL,
  211             EVENTHANDLER_PRI_ANY);
  212 }
  213 
  214 #ifdef VIMAGE
  215 void
  216 rip_destroy(void)
  217 {
  218 
  219         in_pcbinfo_destroy(&V_ripcbinfo);
  220 }
  221 #endif
  222 
  223 #ifdef INET
  224 static int
  225 rip_append(struct inpcb *last, struct ip *ip, struct mbuf *n,
  226     struct sockaddr_in *ripsrc)
  227 {
  228         int policyfail = 0;
  229 
  230         INP_LOCK_ASSERT(last);
  231 
  232 #ifdef IPSEC
  233         /* check AH/ESP integrity. */
  234         if (ipsec4_in_reject(n, last)) {
  235                 policyfail = 1;
  236         }
  237 #endif /* IPSEC */
  238 #ifdef MAC
  239         if (!policyfail && mac_inpcb_check_deliver(last, n) != 0)
  240                 policyfail = 1;
  241 #endif
  242         /* Check the minimum TTL for socket. */
  243         if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl)
  244                 policyfail = 1;
  245         if (!policyfail) {
  246                 struct mbuf *opts = NULL;
  247                 struct socket *so;
  248 
  249                 so = last->inp_socket;
  250                 if ((last->inp_flags & INP_CONTROLOPTS) ||
  251                     (so->so_options & (SO_TIMESTAMP | SO_BINTIME)))
  252                         ip_savecontrol(last, &opts, ip, n);
  253                 SOCKBUF_LOCK(&so->so_rcv);
  254                 if (sbappendaddr_locked(&so->so_rcv,
  255                     (struct sockaddr *)ripsrc, n, opts) == 0) {
  256                         /* should notify about lost packet */
  257                         m_freem(n);
  258                         if (opts)
  259                                 m_freem(opts);
  260                         SOCKBUF_UNLOCK(&so->so_rcv);
  261                 } else
  262                         sorwakeup_locked(so);
  263         } else
  264                 m_freem(n);
  265         return (policyfail);
  266 }
  267 
  268 /*
  269  * Setup generic address and protocol structures for raw_input routine, then
  270  * pass them along with mbuf chain.
  271  */
  272 void
  273 rip_input(struct mbuf *m, int off)
  274 {
  275         struct ifnet *ifp;
  276         struct ip *ip = mtod(m, struct ip *);
  277         int proto = ip->ip_p;
  278         struct inpcb *inp, *last;
  279         struct sockaddr_in ripsrc;
  280         int hash;
  281 
  282         bzero(&ripsrc, sizeof(ripsrc));
  283         ripsrc.sin_len = sizeof(ripsrc);
  284         ripsrc.sin_family = AF_INET;
  285         ripsrc.sin_addr = ip->ip_src;
  286         last = NULL;
  287 
  288         ifp = m->m_pkthdr.rcvif;
  289         /*
  290          * Applications on raw sockets expect host byte order.
  291          */
  292         ip->ip_len = ntohs(ip->ip_len);
  293         ip->ip_off = ntohs(ip->ip_off);
  294 
  295         hash = INP_PCBHASH_RAW(proto, ip->ip_src.s_addr,
  296             ip->ip_dst.s_addr, V_ripcbinfo.ipi_hashmask);
  297         INP_INFO_RLOCK(&V_ripcbinfo);
  298         LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[hash], inp_hash) {
  299                 if (inp->inp_ip_p != proto)
  300                         continue;
  301 #ifdef INET6
  302                 /* XXX inp locking */
  303                 if ((inp->inp_vflag & INP_IPV4) == 0)
  304                         continue;
  305 #endif
  306                 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
  307                         continue;
  308                 if (inp->inp_faddr.s_addr != ip->ip_src.s_addr)
  309                         continue;
  310                 if (jailed_without_vnet(inp->inp_cred)) {
  311                         /*
  312                          * XXX: If faddr was bound to multicast group,
  313                          * jailed raw socket will drop datagram.
  314                          */
  315                         if (prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0)
  316                                 continue;
  317                 }
  318                 if (last != NULL) {
  319                         struct mbuf *n;
  320 
  321                         n = m_copy(m, 0, (int)M_COPYALL);
  322                         if (n != NULL)
  323                             (void) rip_append(last, ip, n, &ripsrc);
  324                         /* XXX count dropped packet */
  325                         INP_RUNLOCK(last);
  326                 }
  327                 INP_RLOCK(inp);
  328                 last = inp;
  329         }
  330         LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[0], inp_hash) {
  331                 if (inp->inp_ip_p && inp->inp_ip_p != proto)
  332                         continue;
  333 #ifdef INET6
  334                 /* XXX inp locking */
  335                 if ((inp->inp_vflag & INP_IPV4) == 0)
  336                         continue;
  337 #endif
  338                 if (!in_nullhost(inp->inp_laddr) &&
  339                     !in_hosteq(inp->inp_laddr, ip->ip_dst))
  340                         continue;
  341                 if (!in_nullhost(inp->inp_faddr) &&
  342                     !in_hosteq(inp->inp_faddr, ip->ip_src))
  343                         continue;
  344                 if (jailed_without_vnet(inp->inp_cred)) {
  345                         /*
  346                          * Allow raw socket in jail to receive multicast;
  347                          * assume process had PRIV_NETINET_RAW at attach,
  348                          * and fall through into normal filter path if so.
  349                          */
  350                         if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
  351                             prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0)
  352                                 continue;
  353                 }
  354                 /*
  355                  * If this raw socket has multicast state, and we
  356                  * have received a multicast, check if this socket
  357                  * should receive it, as multicast filtering is now
  358                  * the responsibility of the transport layer.
  359                  */
  360                 if (inp->inp_moptions != NULL &&
  361                     IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
  362                         /*
  363                          * If the incoming datagram is for IGMP, allow it
  364                          * through unconditionally to the raw socket.
  365                          *
  366                          * In the case of IGMPv2, we may not have explicitly
  367                          * joined the group, and may have set IFF_ALLMULTI
  368                          * on the interface. imo_multi_filter() may discard
  369                          * control traffic we actually need to see.
  370                          *
  371                          * Userland multicast routing daemons should continue
  372                          * filter the control traffic appropriately.
  373                          */
  374                         int blocked;
  375 
  376                         blocked = MCAST_PASS;
  377                         if (proto != IPPROTO_IGMP) {
  378                                 struct sockaddr_in group;
  379 
  380                                 bzero(&group, sizeof(struct sockaddr_in));
  381                                 group.sin_len = sizeof(struct sockaddr_in);
  382                                 group.sin_family = AF_INET;
  383                                 group.sin_addr = ip->ip_dst;
  384 
  385                                 blocked = imo_multi_filter(inp->inp_moptions,
  386                                     ifp,
  387                                     (struct sockaddr *)&group,
  388                                     (struct sockaddr *)&ripsrc);
  389                         }
  390 
  391                         if (blocked != MCAST_PASS) {
  392                                 IPSTAT_INC(ips_notmember);
  393                                 continue;
  394                         }
  395                 }
  396                 if (last != NULL) {
  397                         struct mbuf *n;
  398 
  399                         n = m_copy(m, 0, (int)M_COPYALL);
  400                         if (n != NULL)
  401                                 (void) rip_append(last, ip, n, &ripsrc);
  402                         /* XXX count dropped packet */
  403                         INP_RUNLOCK(last);
  404                 }
  405                 INP_RLOCK(inp);
  406                 last = inp;
  407         }
  408         INP_INFO_RUNLOCK(&V_ripcbinfo);
  409         if (last != NULL) {
  410                 if (rip_append(last, ip, m, &ripsrc) != 0)
  411                         IPSTAT_INC(ips_delivered);
  412                 INP_RUNLOCK(last);
  413         } else {
  414                 m_freem(m);
  415                 IPSTAT_INC(ips_noproto);
  416                 IPSTAT_DEC(ips_delivered);
  417         }
  418 }
  419 
  420 /*
  421  * Generate IP header and pass packet to ip_output.  Tack on options user may
  422  * have setup with control call.
  423  */
  424 int
  425 rip_output(struct mbuf *m, struct socket *so, u_long dst)
  426 {
  427         struct ip *ip;
  428         int error;
  429         struct inpcb *inp = sotoinpcb(so);
  430         int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) |
  431             IP_ALLOWBROADCAST;
  432 
  433         /*
  434          * If the user handed us a complete IP packet, use it.  Otherwise,
  435          * allocate an mbuf for a header and fill it in.
  436          */
  437         if ((inp->inp_flags & INP_HDRINCL) == 0) {
  438                 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
  439                         m_freem(m);
  440                         return(EMSGSIZE);
  441                 }
  442                 M_PREPEND(m, sizeof(struct ip), M_NOWAIT);
  443                 if (m == NULL)
  444                         return(ENOBUFS);
  445 
  446                 INP_RLOCK(inp);
  447                 ip = mtod(m, struct ip *);
  448                 ip->ip_tos = inp->inp_ip_tos;
  449                 if (inp->inp_flags & INP_DONTFRAG)
  450                         ip->ip_off = htons(IP_DF);
  451                 else
  452                         ip->ip_off = htons(0);
  453                 ip->ip_p = inp->inp_ip_p;
  454                 ip->ip_len = htons(m->m_pkthdr.len);
  455                 ip->ip_src = inp->inp_laddr;
  456                 ip->ip_dst.s_addr = dst;
  457                 if (jailed(inp->inp_cred)) {
  458                         /*
  459                          * prison_local_ip4() would be good enough but would
  460                          * let a source of INADDR_ANY pass, which we do not
  461                          * want to see from jails.
  462                          */
  463                         if (ip->ip_src.s_addr == INADDR_ANY) {
  464                                 error = in_pcbladdr(inp, &ip->ip_dst, &ip->ip_src,
  465                                     inp->inp_cred);
  466                         } else {
  467                                 error = prison_local_ip4(inp->inp_cred,
  468                                     &ip->ip_src);
  469                         }
  470                         if (error != 0) {
  471                                 INP_RUNLOCK(inp);
  472                                 m_freem(m);
  473                                 return (error);
  474                         }
  475                 }
  476                 ip->ip_ttl = inp->inp_ip_ttl;
  477         } else {
  478                 if (m->m_pkthdr.len > IP_MAXPACKET) {
  479                         m_freem(m);
  480                         return(EMSGSIZE);
  481                 }
  482                 INP_RLOCK(inp);
  483                 ip = mtod(m, struct ip *);
  484                 error = prison_check_ip4(inp->inp_cred, &ip->ip_src);
  485                 if (error != 0) {
  486                         INP_RUNLOCK(inp);
  487                         m_freem(m);
  488                         return (error);
  489                 }
  490 
  491                 /*
  492                  * Don't allow both user specified and setsockopt options,
  493                  * and don't allow packet length sizes that will crash.
  494                  */
  495                 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options)
  496                     || (ip->ip_len > m->m_pkthdr.len)
  497                     || (ip->ip_len < (ip->ip_hl << 2))) {
  498                         INP_RUNLOCK(inp);
  499                         m_freem(m);
  500                         return (EINVAL);
  501                 }
  502                 if (ip->ip_id == 0)
  503                         ip->ip_id = ip_newid();
  504 
  505                 /*
  506                  * Applications on raw sockets pass us packets
  507                  * in host byte order.
  508                  */
  509                 ip->ip_len = htons(ip->ip_len);
  510                 ip->ip_off = htons(ip->ip_off);
  511 
  512                 /*
  513                  * XXX prevent ip_output from overwriting header fields.
  514                  */
  515                 flags |= IP_RAWOUTPUT;
  516                 IPSTAT_INC(ips_rawout);
  517         }
  518 
  519         if (inp->inp_flags & INP_ONESBCAST)
  520                 flags |= IP_SENDONES;
  521 
  522 #ifdef MAC
  523         mac_inpcb_create_mbuf(inp, m);
  524 #endif
  525 
  526         error = ip_output(m, inp->inp_options, NULL, flags,
  527             inp->inp_moptions, inp);
  528         INP_RUNLOCK(inp);
  529         return (error);
  530 }
  531 
  532 /*
  533  * Raw IP socket option processing.
  534  *
  535  * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could
  536  * only be created by a privileged process, and as such, socket option
  537  * operations to manage system properties on any raw socket were allowed to
  538  * take place without explicit additional access control checks.  However,
  539  * raw sockets can now also be created in jail(), and therefore explicit
  540  * checks are now required.  Likewise, raw sockets can be used by a process
  541  * after it gives up privilege, so some caution is required.  For options
  542  * passed down to the IP layer via ip_ctloutput(), checks are assumed to be
  543  * performed in ip_ctloutput() and therefore no check occurs here.
  544  * Unilaterally checking priv_check() here breaks normal IP socket option
  545  * operations on raw sockets.
  546  *
  547  * When adding new socket options here, make sure to add access control
  548  * checks here as necessary.
  549  *
  550  * XXX-BZ inp locking?
  551  */
  552 int
  553 rip_ctloutput(struct socket *so, struct sockopt *sopt)
  554 {
  555         struct  inpcb *inp = sotoinpcb(so);
  556         int     error, optval;
  557 
  558         if (sopt->sopt_level != IPPROTO_IP) {
  559                 if ((sopt->sopt_level == SOL_SOCKET) &&
  560                     (sopt->sopt_name == SO_SETFIB)) {
  561                         inp->inp_inc.inc_fibnum = so->so_fibnum;
  562                         return (0);
  563                 }
  564                 return (EINVAL);
  565         }
  566 
  567         error = 0;
  568         switch (sopt->sopt_dir) {
  569         case SOPT_GET:
  570                 switch (sopt->sopt_name) {
  571                 case IP_HDRINCL:
  572                         optval = inp->inp_flags & INP_HDRINCL;
  573                         error = sooptcopyout(sopt, &optval, sizeof optval);
  574                         break;
  575 
  576                 case IP_FW3:    /* generic ipfw v.3 functions */
  577                 case IP_FW_ADD: /* ADD actually returns the body... */
  578                 case IP_FW_GET:
  579                 case IP_FW_TABLE_GETSIZE:
  580                 case IP_FW_TABLE_LIST:
  581                 case IP_FW_NAT_GET_CONFIG:
  582                 case IP_FW_NAT_GET_LOG:
  583                         if (V_ip_fw_ctl_ptr != NULL)
  584                                 error = V_ip_fw_ctl_ptr(sopt);
  585                         else
  586                                 error = ENOPROTOOPT;
  587                         break;
  588 
  589                 case IP_DUMMYNET3:      /* generic dummynet v.3 functions */
  590                 case IP_DUMMYNET_GET:
  591                         if (ip_dn_ctl_ptr != NULL)
  592                                 error = ip_dn_ctl_ptr(sopt);
  593                         else
  594                                 error = ENOPROTOOPT;
  595                         break ;
  596 
  597                 case MRT_INIT:
  598                 case MRT_DONE:
  599                 case MRT_ADD_VIF:
  600                 case MRT_DEL_VIF:
  601                 case MRT_ADD_MFC:
  602                 case MRT_DEL_MFC:
  603                 case MRT_VERSION:
  604                 case MRT_ASSERT:
  605                 case MRT_API_SUPPORT:
  606                 case MRT_API_CONFIG:
  607                 case MRT_ADD_BW_UPCALL:
  608                 case MRT_DEL_BW_UPCALL:
  609                         error = priv_check(curthread, PRIV_NETINET_MROUTE);
  610                         if (error != 0)
  611                                 return (error);
  612                         error = ip_mrouter_get ? ip_mrouter_get(so, sopt) :
  613                                 EOPNOTSUPP;
  614                         break;
  615 
  616                 default:
  617                         error = ip_ctloutput(so, sopt);
  618                         break;
  619                 }
  620                 break;
  621 
  622         case SOPT_SET:
  623                 switch (sopt->sopt_name) {
  624                 case IP_HDRINCL:
  625                         error = sooptcopyin(sopt, &optval, sizeof optval,
  626                                             sizeof optval);
  627                         if (error)
  628                                 break;
  629                         if (optval)
  630                                 inp->inp_flags |= INP_HDRINCL;
  631                         else
  632                                 inp->inp_flags &= ~INP_HDRINCL;
  633                         break;
  634 
  635                 case IP_FW3:    /* generic ipfw v.3 functions */
  636                 case IP_FW_ADD:
  637                 case IP_FW_DEL:
  638                 case IP_FW_FLUSH:
  639                 case IP_FW_ZERO:
  640                 case IP_FW_RESETLOG:
  641                 case IP_FW_TABLE_ADD:
  642                 case IP_FW_TABLE_DEL:
  643                 case IP_FW_TABLE_FLUSH:
  644                 case IP_FW_NAT_CFG:
  645                 case IP_FW_NAT_DEL:
  646                         if (V_ip_fw_ctl_ptr != NULL)
  647                                 error = V_ip_fw_ctl_ptr(sopt);
  648                         else
  649                                 error = ENOPROTOOPT;
  650                         break;
  651 
  652                 case IP_DUMMYNET3:      /* generic dummynet v.3 functions */
  653                 case IP_DUMMYNET_CONFIGURE:
  654                 case IP_DUMMYNET_DEL:
  655                 case IP_DUMMYNET_FLUSH:
  656                         if (ip_dn_ctl_ptr != NULL)
  657                                 error = ip_dn_ctl_ptr(sopt);
  658                         else
  659                                 error = ENOPROTOOPT ;
  660                         break ;
  661 
  662                 case IP_RSVP_ON:
  663                         error = priv_check(curthread, PRIV_NETINET_MROUTE);
  664                         if (error != 0)
  665                                 return (error);
  666                         error = ip_rsvp_init(so);
  667                         break;
  668 
  669                 case IP_RSVP_OFF:
  670                         error = priv_check(curthread, PRIV_NETINET_MROUTE);
  671                         if (error != 0)
  672                                 return (error);
  673                         error = ip_rsvp_done();
  674                         break;
  675 
  676                 case IP_RSVP_VIF_ON:
  677                 case IP_RSVP_VIF_OFF:
  678                         error = priv_check(curthread, PRIV_NETINET_MROUTE);
  679                         if (error != 0)
  680                                 return (error);
  681                         error = ip_rsvp_vif ?
  682                                 ip_rsvp_vif(so, sopt) : EINVAL;
  683                         break;
  684 
  685                 case MRT_INIT:
  686                 case MRT_DONE:
  687                 case MRT_ADD_VIF:
  688                 case MRT_DEL_VIF:
  689                 case MRT_ADD_MFC:
  690                 case MRT_DEL_MFC:
  691                 case MRT_VERSION:
  692                 case MRT_ASSERT:
  693                 case MRT_API_SUPPORT:
  694                 case MRT_API_CONFIG:
  695                 case MRT_ADD_BW_UPCALL:
  696                 case MRT_DEL_BW_UPCALL:
  697                         error = priv_check(curthread, PRIV_NETINET_MROUTE);
  698                         if (error != 0)
  699                                 return (error);
  700                         error = ip_mrouter_set ? ip_mrouter_set(so, sopt) :
  701                                         EOPNOTSUPP;
  702                         break;
  703 
  704                 default:
  705                         error = ip_ctloutput(so, sopt);
  706                         break;
  707                 }
  708                 break;
  709         }
  710 
  711         return (error);
  712 }
  713 
  714 /*
  715  * This function exists solely to receive the PRC_IFDOWN messages which are
  716  * sent by if_down().  It looks for an ifaddr whose ifa_addr is sa, and calls
  717  * in_ifadown() to remove all routes corresponding to that address.  It also
  718  * receives the PRC_IFUP messages from if_up() and reinstalls the interface
  719  * routes.
  720  */
  721 void
  722 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip)
  723 {
  724         struct in_ifaddr *ia;
  725         struct ifnet *ifp;
  726         int err;
  727         int flags;
  728 
  729         switch (cmd) {
  730         case PRC_IFDOWN:
  731                 IN_IFADDR_RLOCK();
  732                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
  733                         if (ia->ia_ifa.ifa_addr == sa
  734                             && (ia->ia_flags & IFA_ROUTE)) {
  735                                 ifa_ref(&ia->ia_ifa);
  736                                 IN_IFADDR_RUNLOCK();
  737                                 /*
  738                                  * in_ifscrub kills the interface route.
  739                                  */
  740                                 in_ifscrub(ia->ia_ifp, ia, 0);
  741                                 /*
  742                                  * in_ifadown gets rid of all the rest of the
  743                                  * routes.  This is not quite the right thing
  744                                  * to do, but at least if we are running a
  745                                  * routing process they will come back.
  746                                  */
  747                                 in_ifadown(&ia->ia_ifa, 0);
  748                                 ifa_free(&ia->ia_ifa);
  749                                 break;
  750                         }
  751                 }
  752                 if (ia == NULL)         /* If ia matched, already unlocked. */
  753                         IN_IFADDR_RUNLOCK();
  754                 break;
  755 
  756         case PRC_IFUP:
  757                 IN_IFADDR_RLOCK();
  758                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
  759                         if (ia->ia_ifa.ifa_addr == sa)
  760                                 break;
  761                 }
  762                 if (ia == NULL || (ia->ia_flags & IFA_ROUTE)) {
  763                         IN_IFADDR_RUNLOCK();
  764                         return;
  765                 }
  766                 ifa_ref(&ia->ia_ifa);
  767                 IN_IFADDR_RUNLOCK();
  768                 flags = RTF_UP;
  769                 ifp = ia->ia_ifa.ifa_ifp;
  770 
  771                 if ((ifp->if_flags & IFF_LOOPBACK)
  772                     || (ifp->if_flags & IFF_POINTOPOINT))
  773                         flags |= RTF_HOST;
  774 
  775                 err = ifa_del_loopback_route((struct ifaddr *)ia, sa);
  776                 if (err == 0)
  777                         ia->ia_flags &= ~IFA_RTSELF;
  778 
  779                 err = rtinit(&ia->ia_ifa, RTM_ADD, flags);
  780                 if (err == 0)
  781                         ia->ia_flags |= IFA_ROUTE;
  782 
  783                 err = ifa_add_loopback_route((struct ifaddr *)ia, sa);
  784                 if (err == 0)
  785                         ia->ia_flags |= IFA_RTSELF;
  786 
  787                 ifa_free(&ia->ia_ifa);
  788                 break;
  789         }
  790 }
  791 
  792 static int
  793 rip_attach(struct socket *so, int proto, struct thread *td)
  794 {
  795         struct inpcb *inp;
  796         int error;
  797 
  798         inp = sotoinpcb(so);
  799         KASSERT(inp == NULL, ("rip_attach: inp != NULL"));
  800 
  801         error = priv_check(td, PRIV_NETINET_RAW);
  802         if (error)
  803                 return (error);
  804         if (proto >= IPPROTO_MAX || proto < 0)
  805                 return EPROTONOSUPPORT;
  806         error = soreserve(so, rip_sendspace, rip_recvspace);
  807         if (error)
  808                 return (error);
  809         INP_INFO_WLOCK(&V_ripcbinfo);
  810         error = in_pcballoc(so, &V_ripcbinfo);
  811         if (error) {
  812                 INP_INFO_WUNLOCK(&V_ripcbinfo);
  813                 return (error);
  814         }
  815         inp = (struct inpcb *)so->so_pcb;
  816         inp->inp_vflag |= INP_IPV4;
  817         inp->inp_ip_p = proto;
  818         inp->inp_ip_ttl = V_ip_defttl;
  819         rip_inshash(inp);
  820         INP_INFO_WUNLOCK(&V_ripcbinfo);
  821         INP_WUNLOCK(inp);
  822         return (0);
  823 }
  824 
  825 static void
  826 rip_detach(struct socket *so)
  827 {
  828         struct inpcb *inp;
  829 
  830         inp = sotoinpcb(so);
  831         KASSERT(inp != NULL, ("rip_detach: inp == NULL"));
  832         KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 
  833             ("rip_detach: not closed"));
  834 
  835         INP_INFO_WLOCK(&V_ripcbinfo);
  836         INP_WLOCK(inp);
  837         rip_delhash(inp);
  838         if (so == V_ip_mrouter && ip_mrouter_done)
  839                 ip_mrouter_done();
  840         if (ip_rsvp_force_done)
  841                 ip_rsvp_force_done(so);
  842         if (so == V_ip_rsvpd)
  843                 ip_rsvp_done();
  844         in_pcbdetach(inp);
  845         in_pcbfree(inp);
  846         INP_INFO_WUNLOCK(&V_ripcbinfo);
  847 }
  848 
  849 static void
  850 rip_dodisconnect(struct socket *so, struct inpcb *inp)
  851 {
  852         struct inpcbinfo *pcbinfo;
  853 
  854         pcbinfo = inp->inp_pcbinfo;
  855         INP_INFO_WLOCK(pcbinfo);
  856         INP_WLOCK(inp);
  857         rip_delhash(inp);
  858         inp->inp_faddr.s_addr = INADDR_ANY;
  859         rip_inshash(inp);
  860         SOCK_LOCK(so);
  861         so->so_state &= ~SS_ISCONNECTED;
  862         SOCK_UNLOCK(so);
  863         INP_WUNLOCK(inp);
  864         INP_INFO_WUNLOCK(pcbinfo);
  865 }
  866 
  867 static void
  868 rip_abort(struct socket *so)
  869 {
  870         struct inpcb *inp;
  871 
  872         inp = sotoinpcb(so);
  873         KASSERT(inp != NULL, ("rip_abort: inp == NULL"));
  874 
  875         rip_dodisconnect(so, inp);
  876 }
  877 
  878 static void
  879 rip_close(struct socket *so)
  880 {
  881         struct inpcb *inp;
  882 
  883         inp = sotoinpcb(so);
  884         KASSERT(inp != NULL, ("rip_close: inp == NULL"));
  885 
  886         rip_dodisconnect(so, inp);
  887 }
  888 
  889 static int
  890 rip_disconnect(struct socket *so)
  891 {
  892         struct inpcb *inp;
  893 
  894         if ((so->so_state & SS_ISCONNECTED) == 0)
  895                 return (ENOTCONN);
  896 
  897         inp = sotoinpcb(so);
  898         KASSERT(inp != NULL, ("rip_disconnect: inp == NULL"));
  899 
  900         rip_dodisconnect(so, inp);
  901         return (0);
  902 }
  903 
  904 static int
  905 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  906 {
  907         struct sockaddr_in *addr = (struct sockaddr_in *)nam;
  908         struct inpcb *inp;
  909         int error;
  910 
  911         if (nam->sa_len != sizeof(*addr))
  912                 return (EINVAL);
  913 
  914         error = prison_check_ip4(td->td_ucred, &addr->sin_addr);
  915         if (error != 0)
  916                 return (error);
  917 
  918         inp = sotoinpcb(so);
  919         KASSERT(inp != NULL, ("rip_bind: inp == NULL"));
  920 
  921         if (TAILQ_EMPTY(&V_ifnet) ||
  922             (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) ||
  923             (addr->sin_addr.s_addr &&
  924              (inp->inp_flags & INP_BINDANY) == 0 &&
  925              ifa_ifwithaddr_check((struct sockaddr *)addr) == 0))
  926                 return (EADDRNOTAVAIL);
  927 
  928         INP_INFO_WLOCK(&V_ripcbinfo);
  929         INP_WLOCK(inp);
  930         rip_delhash(inp);
  931         inp->inp_laddr = addr->sin_addr;
  932         rip_inshash(inp);
  933         INP_WUNLOCK(inp);
  934         INP_INFO_WUNLOCK(&V_ripcbinfo);
  935         return (0);
  936 }
  937 
  938 static int
  939 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  940 {
  941         struct sockaddr_in *addr = (struct sockaddr_in *)nam;
  942         struct inpcb *inp;
  943 
  944         if (nam->sa_len != sizeof(*addr))
  945                 return (EINVAL);
  946         if (TAILQ_EMPTY(&V_ifnet))
  947                 return (EADDRNOTAVAIL);
  948         if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK)
  949                 return (EAFNOSUPPORT);
  950 
  951         inp = sotoinpcb(so);
  952         KASSERT(inp != NULL, ("rip_connect: inp == NULL"));
  953 
  954         INP_INFO_WLOCK(&V_ripcbinfo);
  955         INP_WLOCK(inp);
  956         rip_delhash(inp);
  957         inp->inp_faddr = addr->sin_addr;
  958         rip_inshash(inp);
  959         soisconnected(so);
  960         INP_WUNLOCK(inp);
  961         INP_INFO_WUNLOCK(&V_ripcbinfo);
  962         return (0);
  963 }
  964 
  965 static int
  966 rip_shutdown(struct socket *so)
  967 {
  968         struct inpcb *inp;
  969 
  970         inp = sotoinpcb(so);
  971         KASSERT(inp != NULL, ("rip_shutdown: inp == NULL"));
  972 
  973         INP_WLOCK(inp);
  974         socantsendmore(so);
  975         INP_WUNLOCK(inp);
  976         return (0);
  977 }
  978 
  979 static int
  980 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  981     struct mbuf *control, struct thread *td)
  982 {
  983         struct inpcb *inp;
  984         u_long dst;
  985 
  986         inp = sotoinpcb(so);
  987         KASSERT(inp != NULL, ("rip_send: inp == NULL"));
  988 
  989         /*
  990          * Note: 'dst' reads below are unlocked.
  991          */
  992         if (so->so_state & SS_ISCONNECTED) {
  993                 if (nam) {
  994                         m_freem(m);
  995                         return (EISCONN);
  996                 }
  997                 dst = inp->inp_faddr.s_addr;    /* Unlocked read. */
  998         } else {
  999                 if (nam == NULL) {
 1000                         m_freem(m);
 1001                         return (ENOTCONN);
 1002                 }
 1003                 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr;
 1004         }
 1005         return (rip_output(m, so, dst));
 1006 }
 1007 #endif /* INET */
 1008 
 1009 static int
 1010 rip_pcblist(SYSCTL_HANDLER_ARGS)
 1011 {
 1012         int error, i, n;
 1013         struct inpcb *inp, **inp_list;
 1014         inp_gen_t gencnt;
 1015         struct xinpgen xig;
 1016 
 1017         /*
 1018          * The process of preparing the TCB list is too time-consuming and
 1019          * resource-intensive to repeat twice on every request.
 1020          */
 1021         if (req->oldptr == 0) {
 1022                 n = V_ripcbinfo.ipi_count;
 1023                 n += imax(n / 8, 10);
 1024                 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
 1025                 return (0);
 1026         }
 1027 
 1028         if (req->newptr != 0)
 1029                 return (EPERM);
 1030 
 1031         /*
 1032          * OK, now we're committed to doing something.
 1033          */
 1034         INP_INFO_RLOCK(&V_ripcbinfo);
 1035         gencnt = V_ripcbinfo.ipi_gencnt;
 1036         n = V_ripcbinfo.ipi_count;
 1037         INP_INFO_RUNLOCK(&V_ripcbinfo);
 1038 
 1039         xig.xig_len = sizeof xig;
 1040         xig.xig_count = n;
 1041         xig.xig_gen = gencnt;
 1042         xig.xig_sogen = so_gencnt;
 1043         error = SYSCTL_OUT(req, &xig, sizeof xig);
 1044         if (error)
 1045                 return (error);
 1046 
 1047         inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
 1048         if (inp_list == 0)
 1049                 return (ENOMEM);
 1050 
 1051         INP_INFO_RLOCK(&V_ripcbinfo);
 1052         for (inp = LIST_FIRST(V_ripcbinfo.ipi_listhead), i = 0; inp && i < n;
 1053              inp = LIST_NEXT(inp, inp_list)) {
 1054                 INP_WLOCK(inp);
 1055                 if (inp->inp_gencnt <= gencnt &&
 1056                     cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
 1057                         in_pcbref(inp);
 1058                         inp_list[i++] = inp;
 1059                 }
 1060                 INP_WUNLOCK(inp);
 1061         }
 1062         INP_INFO_RUNLOCK(&V_ripcbinfo);
 1063         n = i;
 1064 
 1065         error = 0;
 1066         for (i = 0; i < n; i++) {
 1067                 inp = inp_list[i];
 1068                 INP_RLOCK(inp);
 1069                 if (inp->inp_gencnt <= gencnt) {
 1070                         struct xinpcb xi;
 1071 
 1072                         bzero(&xi, sizeof(xi));
 1073                         xi.xi_len = sizeof xi;
 1074                         /* XXX should avoid extra copy */
 1075                         bcopy(inp, &xi.xi_inp, sizeof *inp);
 1076                         if (inp->inp_socket)
 1077                                 sotoxsocket(inp->inp_socket, &xi.xi_socket);
 1078                         INP_RUNLOCK(inp);
 1079                         error = SYSCTL_OUT(req, &xi, sizeof xi);
 1080                 } else
 1081                         INP_RUNLOCK(inp);
 1082         }
 1083         INP_INFO_WLOCK(&V_ripcbinfo);
 1084         for (i = 0; i < n; i++) {
 1085                 inp = inp_list[i];
 1086                 INP_RLOCK(inp);
 1087                 if (!in_pcbrele_rlocked(inp))
 1088                         INP_RUNLOCK(inp);
 1089         }
 1090         INP_INFO_WUNLOCK(&V_ripcbinfo);
 1091 
 1092         if (!error) {
 1093                 /*
 1094                  * Give the user an updated idea of our state.  If the
 1095                  * generation differs from what we told her before, she knows
 1096                  * that something happened while we were processing this
 1097                  * request, and it might be necessary to retry.
 1098                  */
 1099                 INP_INFO_RLOCK(&V_ripcbinfo);
 1100                 xig.xig_gen = V_ripcbinfo.ipi_gencnt;
 1101                 xig.xig_sogen = so_gencnt;
 1102                 xig.xig_count = V_ripcbinfo.ipi_count;
 1103                 INP_INFO_RUNLOCK(&V_ripcbinfo);
 1104                 error = SYSCTL_OUT(req, &xig, sizeof xig);
 1105         }
 1106         free(inp_list, M_TEMP);
 1107         return (error);
 1108 }
 1109 
 1110 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist,
 1111     CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
 1112     rip_pcblist, "S,xinpcb", "List of active raw IP sockets");
 1113 
 1114 #ifdef INET
 1115 struct pr_usrreqs rip_usrreqs = {
 1116         .pru_abort =            rip_abort,
 1117         .pru_attach =           rip_attach,
 1118         .pru_bind =             rip_bind,
 1119         .pru_connect =          rip_connect,
 1120         .pru_control =          in_control,
 1121         .pru_detach =           rip_detach,
 1122         .pru_disconnect =       rip_disconnect,
 1123         .pru_peeraddr =         in_getpeeraddr,
 1124         .pru_send =             rip_send,
 1125         .pru_shutdown =         rip_shutdown,
 1126         .pru_sockaddr =         in_getsockaddr,
 1127         .pru_sosetlabel =       in_pcbsosetlabel,
 1128         .pru_close =            rip_close,
 1129 };
 1130 #endif /* INET */

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