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


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_icmp.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1988, 1993
    5  *      The Regents of the University of California.  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 University 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 REGENTS 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 REGENTS 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  *      @(#)ip_icmp.c   8.2 (Berkeley) 1/4/94
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: head/sys/netinet/ip_icmp.c 345560 2019-03-26 22:14:50Z markj $");
   36 
   37 #include "opt_inet.h"
   38 
   39 #include <sys/param.h>
   40 #include <sys/systm.h>
   41 #include <sys/mbuf.h>
   42 #include <sys/protosw.h>
   43 #include <sys/socket.h>
   44 #include <sys/time.h>
   45 #include <sys/kernel.h>
   46 #include <sys/lock.h>
   47 #include <sys/rmlock.h>
   48 #include <sys/sysctl.h>
   49 #include <sys/syslog.h>
   50 
   51 #include <net/if.h>
   52 #include <net/if_var.h>
   53 #include <net/if_types.h>
   54 #include <net/route.h>
   55 #include <net/vnet.h>
   56 
   57 #include <netinet/in.h>
   58 #include <netinet/in_fib.h>
   59 #include <netinet/in_pcb.h>
   60 #include <netinet/in_systm.h>
   61 #include <netinet/in_var.h>
   62 #include <netinet/ip.h>
   63 #include <netinet/ip_icmp.h>
   64 #include <netinet/ip_var.h>
   65 #include <netinet/ip_options.h>
   66 #include <netinet/sctp.h>
   67 #include <netinet/tcp.h>
   68 #include <netinet/tcp_var.h>
   69 #include <netinet/tcpip.h>
   70 #include <netinet/icmp_var.h>
   71 
   72 
   73 #ifdef INET
   74 
   75 #include <machine/in_cksum.h>
   76 
   77 #include <security/mac/mac_framework.h>
   78 #endif /* INET */
   79 
   80 /*
   81  * ICMP routines: error generation, receive packet processing, and
   82  * routines to turnaround packets back to the originator, and
   83  * host table maintenance routines.
   84  */
   85 VNET_DEFINE_STATIC(int, icmplim) = 200;
   86 #define V_icmplim                       VNET(icmplim)
   87 SYSCTL_INT(_net_inet_icmp, ICMPCTL_ICMPLIM, icmplim, CTLFLAG_VNET | CTLFLAG_RW,
   88         &VNET_NAME(icmplim), 0,
   89         "Maximum number of ICMP responses per second");
   90 
   91 VNET_DEFINE_STATIC(int, icmplim_output) = 1;
   92 #define V_icmplim_output                VNET(icmplim_output)
   93 SYSCTL_INT(_net_inet_icmp, OID_AUTO, icmplim_output, CTLFLAG_VNET | CTLFLAG_RW,
   94         &VNET_NAME(icmplim_output), 0,
   95         "Enable logging of ICMP response rate limiting");
   96 
   97 #ifdef INET
   98 VNET_PCPUSTAT_DEFINE(struct icmpstat, icmpstat);
   99 VNET_PCPUSTAT_SYSINIT(icmpstat);
  100 SYSCTL_VNET_PCPUSTAT(_net_inet_icmp, ICMPCTL_STATS, stats, struct icmpstat,
  101     icmpstat, "ICMP statistics (struct icmpstat, netinet/icmp_var.h)");
  102 
  103 #ifdef VIMAGE
  104 VNET_PCPUSTAT_SYSUNINIT(icmpstat);
  105 #endif /* VIMAGE */
  106 
  107 VNET_DEFINE_STATIC(int, icmpmaskrepl) = 0;
  108 #define V_icmpmaskrepl                  VNET(icmpmaskrepl)
  109 SYSCTL_INT(_net_inet_icmp, ICMPCTL_MASKREPL, maskrepl, CTLFLAG_VNET | CTLFLAG_RW,
  110         &VNET_NAME(icmpmaskrepl), 0,
  111         "Reply to ICMP Address Mask Request packets");
  112 
  113 VNET_DEFINE_STATIC(u_int, icmpmaskfake) = 0;
  114 #define V_icmpmaskfake                  VNET(icmpmaskfake)
  115 SYSCTL_UINT(_net_inet_icmp, OID_AUTO, maskfake, CTLFLAG_VNET | CTLFLAG_RW,
  116         &VNET_NAME(icmpmaskfake), 0,
  117         "Fake reply to ICMP Address Mask Request packets");
  118 
  119 VNET_DEFINE(int, drop_redirect) = 0;
  120 #define V_drop_redirect                 VNET(drop_redirect)
  121 SYSCTL_INT(_net_inet_icmp, OID_AUTO, drop_redirect, CTLFLAG_VNET | CTLFLAG_RW,
  122         &VNET_NAME(drop_redirect), 0,
  123         "Ignore ICMP redirects");
  124 
  125 VNET_DEFINE_STATIC(int, log_redirect) = 0;
  126 #define V_log_redirect                  VNET(log_redirect)
  127 SYSCTL_INT(_net_inet_icmp, OID_AUTO, log_redirect, CTLFLAG_VNET | CTLFLAG_RW,
  128         &VNET_NAME(log_redirect), 0,
  129         "Log ICMP redirects to the console");
  130 
  131 VNET_DEFINE_STATIC(char, reply_src[IFNAMSIZ]);
  132 #define V_reply_src                     VNET(reply_src)
  133 SYSCTL_STRING(_net_inet_icmp, OID_AUTO, reply_src, CTLFLAG_VNET | CTLFLAG_RW,
  134         &VNET_NAME(reply_src), IFNAMSIZ,
  135         "ICMP reply source for non-local packets");
  136 
  137 VNET_DEFINE_STATIC(int, icmp_rfi) = 0;
  138 #define V_icmp_rfi                      VNET(icmp_rfi)
  139 SYSCTL_INT(_net_inet_icmp, OID_AUTO, reply_from_interface, CTLFLAG_VNET | CTLFLAG_RW,
  140         &VNET_NAME(icmp_rfi), 0,
  141         "ICMP reply from incoming interface for non-local packets");
  142 /* Router requirements RFC 1812 section 4.3.2.3 requires 576 - 28. */
  143 VNET_DEFINE_STATIC(int, icmp_quotelen) = 548;
  144 #define V_icmp_quotelen                 VNET(icmp_quotelen)
  145 SYSCTL_INT(_net_inet_icmp, OID_AUTO, quotelen, CTLFLAG_VNET | CTLFLAG_RW,
  146         &VNET_NAME(icmp_quotelen), 0,
  147         "Number of bytes from original packet to quote in ICMP reply");
  148 
  149 VNET_DEFINE_STATIC(int, icmpbmcastecho) = 0;
  150 #define V_icmpbmcastecho                VNET(icmpbmcastecho)
  151 SYSCTL_INT(_net_inet_icmp, OID_AUTO, bmcastecho, CTLFLAG_VNET | CTLFLAG_RW,
  152         &VNET_NAME(icmpbmcastecho), 0,
  153         "Reply to multicast ICMP Echo Request and Timestamp packets");
  154 
  155 VNET_DEFINE_STATIC(int, icmptstamprepl) = 1;
  156 #define V_icmptstamprepl                VNET(icmptstamprepl)
  157 SYSCTL_INT(_net_inet_icmp, OID_AUTO, tstamprepl, CTLFLAG_VNET | CTLFLAG_RW,
  158         &VNET_NAME(icmptstamprepl), 0,
  159         "Respond to ICMP Timestamp packets");
  160 
  161 VNET_DEFINE_STATIC(int, error_keeptags) = 0;
  162 #define V_error_keeptags                VNET(error_keeptags)
  163 SYSCTL_INT(_net_inet_icmp, OID_AUTO, error_keeptags, CTLFLAG_VNET | CTLFLAG_RW,
  164         &VNET_NAME(error_keeptags), 0,
  165         "ICMP error response keeps copy of mbuf_tags of original packet");
  166 
  167 #ifdef ICMPPRINTFS
  168 int     icmpprintfs = 0;
  169 #endif
  170 
  171 static void     icmp_reflect(struct mbuf *);
  172 static void     icmp_send(struct mbuf *, struct mbuf *);
  173 
  174 extern  struct protosw inetsw[];
  175 
  176 /*
  177  * Kernel module interface for updating icmpstat.  The argument is an index
  178  * into icmpstat treated as an array of u_long.  While this encodes the
  179  * general layout of icmpstat into the caller, it doesn't encode its
  180  * location, so that future changes to add, for example, per-CPU stats
  181  * support won't cause binary compatibility problems for kernel modules.
  182  */
  183 void
  184 kmod_icmpstat_inc(int statnum)
  185 {
  186 
  187         counter_u64_add(VNET(icmpstat)[statnum], 1);
  188 }
  189 
  190 /*
  191  * Generate an error packet of type error
  192  * in response to bad packet ip.
  193  */
  194 void
  195 icmp_error(struct mbuf *n, int type, int code, uint32_t dest, int mtu)
  196 {
  197         struct ip *oip, *nip;
  198         struct icmp *icp;
  199         struct mbuf *m;
  200         unsigned icmplen, icmpelen, nlen, oiphlen;
  201 
  202         KASSERT((u_int)type <= ICMP_MAXTYPE, ("%s: illegal ICMP type",
  203             __func__));
  204 
  205         if (type != ICMP_REDIRECT)
  206                 ICMPSTAT_INC(icps_error);
  207         /*
  208          * Don't send error:
  209          *  if the original packet was encrypted.
  210          *  if not the first fragment of message.
  211          *  in response to a multicast or broadcast packet.
  212          *  if the old packet protocol was an ICMP error message.
  213          */
  214         if (n->m_flags & M_DECRYPTED)
  215                 goto freeit;
  216         if (n->m_flags & (M_BCAST|M_MCAST))
  217                 goto freeit;
  218 
  219         /* Drop if IP header plus 8 bytes is not contiguous in first mbuf. */
  220         if (n->m_len < sizeof(struct ip) + ICMP_MINLEN)
  221                 goto freeit;
  222         oip = mtod(n, struct ip *);
  223         oiphlen = oip->ip_hl << 2;
  224         if (n->m_len < oiphlen + ICMP_MINLEN)
  225                 goto freeit;
  226 #ifdef ICMPPRINTFS
  227         if (icmpprintfs)
  228                 printf("icmp_error(%p, %x, %d)\n", oip, type, code);
  229 #endif
  230         if (oip->ip_off & htons(~(IP_MF|IP_DF)))
  231                 goto freeit;
  232         if (oip->ip_p == IPPROTO_ICMP && type != ICMP_REDIRECT &&
  233             !ICMP_INFOTYPE(((struct icmp *)((caddr_t)oip +
  234                 oiphlen))->icmp_type)) {
  235                 ICMPSTAT_INC(icps_oldicmp);
  236                 goto freeit;
  237         }
  238         /*
  239          * Calculate length to quote from original packet and
  240          * prevent the ICMP mbuf from overflowing.
  241          * Unfortunately this is non-trivial since ip_forward()
  242          * sends us truncated packets.
  243          */
  244         nlen = m_length(n, NULL);
  245         if (oip->ip_p == IPPROTO_TCP) {
  246                 struct tcphdr *th;
  247                 int tcphlen;
  248 
  249                 if (oiphlen + sizeof(struct tcphdr) > n->m_len &&
  250                     n->m_next == NULL)
  251                         goto stdreply;
  252                 if (n->m_len < oiphlen + sizeof(struct tcphdr) &&
  253                     (n = m_pullup(n, oiphlen + sizeof(struct tcphdr))) == NULL)
  254                         goto freeit;
  255                 oip = mtod(n, struct ip *);
  256                 th = mtodo(n, oiphlen);
  257                 tcphlen = th->th_off << 2;
  258                 if (tcphlen < sizeof(struct tcphdr))
  259                         goto freeit;
  260                 if (ntohs(oip->ip_len) < oiphlen + tcphlen)
  261                         goto freeit;
  262                 if (oiphlen + tcphlen > n->m_len && n->m_next == NULL)
  263                         goto stdreply;
  264                 if (n->m_len < oiphlen + tcphlen &&
  265                     (n = m_pullup(n, oiphlen + tcphlen)) == NULL)
  266                         goto freeit;
  267                 oip = mtod(n, struct ip *);
  268                 icmpelen = max(tcphlen, min(V_icmp_quotelen,
  269                     ntohs(oip->ip_len) - oiphlen));
  270         } else if (oip->ip_p == IPPROTO_SCTP) {
  271                 struct sctphdr *sh;
  272                 struct sctp_chunkhdr *ch;
  273 
  274                 if (ntohs(oip->ip_len) < oiphlen + sizeof(struct sctphdr))
  275                         goto stdreply;
  276                 if (oiphlen + sizeof(struct sctphdr) > n->m_len &&
  277                     n->m_next == NULL)
  278                         goto stdreply;
  279                 if (n->m_len < oiphlen + sizeof(struct sctphdr) &&
  280                     (n = m_pullup(n, oiphlen + sizeof(struct sctphdr))) == NULL)
  281                         goto freeit;
  282                 oip = mtod(n, struct ip *);
  283                 icmpelen = max(sizeof(struct sctphdr),
  284                     min(V_icmp_quotelen, ntohs(oip->ip_len) - oiphlen));
  285                 sh = mtodo(n, oiphlen);
  286                 if (ntohl(sh->v_tag) == 0 &&
  287                     ntohs(oip->ip_len) >= oiphlen +
  288                     sizeof(struct sctphdr) + 8 &&
  289                     (n->m_len >= oiphlen + sizeof(struct sctphdr) + 8 ||
  290                      n->m_next != NULL)) {
  291                         if (n->m_len < oiphlen + sizeof(struct sctphdr) + 8 &&
  292                             (n = m_pullup(n, oiphlen +
  293                             sizeof(struct sctphdr) + 8)) == NULL)
  294                                 goto freeit;
  295                         oip = mtod(n, struct ip *);
  296                         sh = mtodo(n, oiphlen);
  297                         ch = (struct sctp_chunkhdr *)(sh + 1);
  298                         if (ch->chunk_type == SCTP_INITIATION) {
  299                                 icmpelen = max(sizeof(struct sctphdr) + 8,
  300                                     min(V_icmp_quotelen, ntohs(oip->ip_len) -
  301                                     oiphlen));
  302                         }
  303                 }
  304         } else
  305 stdreply:       icmpelen = max(8, min(V_icmp_quotelen, ntohs(oip->ip_len) -
  306                     oiphlen));
  307 
  308         icmplen = min(oiphlen + icmpelen, nlen);
  309         if (icmplen < sizeof(struct ip))
  310                 goto freeit;
  311 
  312         if (MHLEN > sizeof(struct ip) + ICMP_MINLEN + icmplen)
  313                 m = m_gethdr(M_NOWAIT, MT_DATA);
  314         else
  315                 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
  316         if (m == NULL)
  317                 goto freeit;
  318 #ifdef MAC
  319         mac_netinet_icmp_reply(n, m);
  320 #endif
  321         icmplen = min(icmplen, M_TRAILINGSPACE(m) -
  322             sizeof(struct ip) - ICMP_MINLEN);
  323         m_align(m, sizeof(struct ip) + ICMP_MINLEN + icmplen);
  324         m->m_data += sizeof(struct ip);
  325         m->m_len = ICMP_MINLEN + icmplen;
  326 
  327         /* XXX MRT  make the outgoing packet use the same FIB
  328          * that was associated with the incoming packet
  329          */
  330         M_SETFIB(m, M_GETFIB(n));
  331         icp = mtod(m, struct icmp *);
  332         ICMPSTAT_INC(icps_outhist[type]);
  333         icp->icmp_type = type;
  334         if (type == ICMP_REDIRECT)
  335                 icp->icmp_gwaddr.s_addr = dest;
  336         else {
  337                 icp->icmp_void = 0;
  338                 /*
  339                  * The following assignments assume an overlay with the
  340                  * just zeroed icmp_void field.
  341                  */
  342                 if (type == ICMP_PARAMPROB) {
  343                         icp->icmp_pptr = code;
  344                         code = 0;
  345                 } else if (type == ICMP_UNREACH &&
  346                         code == ICMP_UNREACH_NEEDFRAG && mtu) {
  347                         icp->icmp_nextmtu = htons(mtu);
  348                 }
  349         }
  350         icp->icmp_code = code;
  351 
  352         /*
  353          * Copy the quotation into ICMP message and
  354          * convert quoted IP header back to network representation.
  355          */
  356         m_copydata(n, 0, icmplen, (caddr_t)&icp->icmp_ip);
  357         nip = &icp->icmp_ip;
  358 
  359         /*
  360          * Set up ICMP message mbuf and copy old IP header (without options
  361          * in front of ICMP message.
  362          * If the original mbuf was meant to bypass the firewall, the error
  363          * reply should bypass as well.
  364          */
  365         m->m_flags |= n->m_flags & M_SKIP_FIREWALL;
  366         KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ip),
  367             ("insufficient space for ip header"));
  368         m->m_data -= sizeof(struct ip);
  369         m->m_len += sizeof(struct ip);
  370         m->m_pkthdr.len = m->m_len;
  371         m->m_pkthdr.rcvif = n->m_pkthdr.rcvif;
  372         nip = mtod(m, struct ip *);
  373         bcopy((caddr_t)oip, (caddr_t)nip, sizeof(struct ip));
  374         nip->ip_len = htons(m->m_len);
  375         nip->ip_v = IPVERSION;
  376         nip->ip_hl = 5;
  377         nip->ip_p = IPPROTO_ICMP;
  378         nip->ip_tos = 0;
  379         nip->ip_off = 0;
  380 
  381         if (V_error_keeptags)
  382                 m_tag_copy_chain(m, n, M_NOWAIT);
  383 
  384         icmp_reflect(m);
  385 
  386 freeit:
  387         m_freem(n);
  388 }
  389 
  390 /*
  391  * Process a received ICMP message.
  392  */
  393 int
  394 icmp_input(struct mbuf **mp, int *offp, int proto)
  395 {
  396         struct epoch_tracker et;
  397         struct icmp *icp;
  398         struct in_ifaddr *ia;
  399         struct mbuf *m = *mp;
  400         struct ip *ip = mtod(m, struct ip *);
  401         struct sockaddr_in icmpsrc, icmpdst, icmpgw;
  402         int hlen = *offp;
  403         int icmplen = ntohs(ip->ip_len) - *offp;
  404         int i, code;
  405         void (*ctlfunc)(int, struct sockaddr *, void *);
  406         int fibnum;
  407 
  408         *mp = NULL;
  409 
  410         /*
  411          * Locate icmp structure in mbuf, and check
  412          * that not corrupted and of at least minimum length.
  413          */
  414 #ifdef ICMPPRINTFS
  415         if (icmpprintfs) {
  416                 char srcbuf[INET_ADDRSTRLEN];
  417                 char dstbuf[INET_ADDRSTRLEN];
  418 
  419                 printf("icmp_input from %s to %s, len %d\n",
  420                     inet_ntoa_r(ip->ip_src, srcbuf),
  421                     inet_ntoa_r(ip->ip_dst, dstbuf), icmplen);
  422         }
  423 #endif
  424         NET_EPOCH_ENTER(et);
  425         if (icmplen < ICMP_MINLEN) {
  426                 ICMPSTAT_INC(icps_tooshort);
  427                 goto freeit;
  428         }
  429         i = hlen + min(icmplen, ICMP_ADVLENMIN);
  430         if (m->m_len < i && (m = m_pullup(m, i)) == NULL)  {
  431                 ICMPSTAT_INC(icps_tooshort);
  432                 NET_EPOCH_EXIT(et);
  433                 return (IPPROTO_DONE);
  434         }
  435         ip = mtod(m, struct ip *);
  436         m->m_len -= hlen;
  437         m->m_data += hlen;
  438         icp = mtod(m, struct icmp *);
  439         if (in_cksum(m, icmplen)) {
  440                 ICMPSTAT_INC(icps_checksum);
  441                 goto freeit;
  442         }
  443         m->m_len += hlen;
  444         m->m_data -= hlen;
  445 
  446 #ifdef ICMPPRINTFS
  447         if (icmpprintfs)
  448                 printf("icmp_input, type %d code %d\n", icp->icmp_type,
  449                     icp->icmp_code);
  450 #endif
  451 
  452         /*
  453          * Message type specific processing.
  454          */
  455         if (icp->icmp_type > ICMP_MAXTYPE)
  456                 goto raw;
  457 
  458         /* Initialize */
  459         bzero(&icmpsrc, sizeof(icmpsrc));
  460         icmpsrc.sin_len = sizeof(struct sockaddr_in);
  461         icmpsrc.sin_family = AF_INET;
  462         bzero(&icmpdst, sizeof(icmpdst));
  463         icmpdst.sin_len = sizeof(struct sockaddr_in);
  464         icmpdst.sin_family = AF_INET;
  465         bzero(&icmpgw, sizeof(icmpgw));
  466         icmpgw.sin_len = sizeof(struct sockaddr_in);
  467         icmpgw.sin_family = AF_INET;
  468 
  469         ICMPSTAT_INC(icps_inhist[icp->icmp_type]);
  470         code = icp->icmp_code;
  471         switch (icp->icmp_type) {
  472 
  473         case ICMP_UNREACH:
  474                 switch (code) {
  475                         case ICMP_UNREACH_NET:
  476                         case ICMP_UNREACH_HOST:
  477                         case ICMP_UNREACH_SRCFAIL:
  478                         case ICMP_UNREACH_NET_UNKNOWN:
  479                         case ICMP_UNREACH_HOST_UNKNOWN:
  480                         case ICMP_UNREACH_ISOLATED:
  481                         case ICMP_UNREACH_TOSNET:
  482                         case ICMP_UNREACH_TOSHOST:
  483                         case ICMP_UNREACH_HOST_PRECEDENCE:
  484                         case ICMP_UNREACH_PRECEDENCE_CUTOFF:
  485                                 code = PRC_UNREACH_NET;
  486                                 break;
  487 
  488                         case ICMP_UNREACH_NEEDFRAG:
  489                                 code = PRC_MSGSIZE;
  490                                 break;
  491 
  492                         /*
  493                          * RFC 1122, Sections 3.2.2.1 and 4.2.3.9.
  494                          * Treat subcodes 2,3 as immediate RST
  495                          */
  496                         case ICMP_UNREACH_PROTOCOL:
  497                                 code = PRC_UNREACH_PROTOCOL;
  498                                 break;
  499                         case ICMP_UNREACH_PORT:
  500                                 code = PRC_UNREACH_PORT;
  501                                 break;
  502 
  503                         case ICMP_UNREACH_NET_PROHIB:
  504                         case ICMP_UNREACH_HOST_PROHIB:
  505                         case ICMP_UNREACH_FILTER_PROHIB:
  506                                 code = PRC_UNREACH_ADMIN_PROHIB;
  507                                 break;
  508 
  509                         default:
  510                                 goto badcode;
  511                 }
  512                 goto deliver;
  513 
  514         case ICMP_TIMXCEED:
  515                 if (code > 1)
  516                         goto badcode;
  517                 code += PRC_TIMXCEED_INTRANS;
  518                 goto deliver;
  519 
  520         case ICMP_PARAMPROB:
  521                 if (code > 1)
  522                         goto badcode;
  523                 code = PRC_PARAMPROB;
  524         deliver:
  525                 /*
  526                  * Problem with datagram; advise higher level routines.
  527                  */
  528                 if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp) ||
  529                     icp->icmp_ip.ip_hl < (sizeof(struct ip) >> 2)) {
  530                         ICMPSTAT_INC(icps_badlen);
  531                         goto freeit;
  532                 }
  533                 /* Discard ICMP's in response to multicast packets */
  534                 if (IN_MULTICAST(ntohl(icp->icmp_ip.ip_dst.s_addr)))
  535                         goto badcode;
  536 #ifdef ICMPPRINTFS
  537                 if (icmpprintfs)
  538                         printf("deliver to protocol %d\n", icp->icmp_ip.ip_p);
  539 #endif
  540                 icmpsrc.sin_addr = icp->icmp_ip.ip_dst;
  541                 /*
  542                  * XXX if the packet contains [IPv4 AH TCP], we can't make a
  543                  * notification to TCP layer.
  544                  */
  545                 i = sizeof(struct ip) + min(icmplen, ICMP_ADVLENPREF(icp));
  546                 ip_stripoptions(m);
  547                 if (m->m_len < i && (m = m_pullup(m, i)) == NULL) {
  548                         /* This should actually not happen */
  549                         ICMPSTAT_INC(icps_tooshort);
  550                         NET_EPOCH_EXIT(et);
  551                         return (IPPROTO_DONE);
  552                 }
  553                 ip = mtod(m, struct ip *);
  554                 icp = (struct icmp *)(ip + 1);
  555                 /*
  556                  * The upper layer handler can rely on:
  557                  * - The outer IP header has no options.
  558                  * - The outer IP header, the ICMP header, the inner IP header,
  559                  *   and the first n bytes of the inner payload are contiguous.
  560                  *   n is at least 8, but might be larger based on 
  561                  *   ICMP_ADVLENPREF. See its definition in ip_icmp.h.
  562                  */
  563                 ctlfunc = inetsw[ip_protox[icp->icmp_ip.ip_p]].pr_ctlinput;
  564                 if (ctlfunc)
  565                         (*ctlfunc)(code, (struct sockaddr *)&icmpsrc,
  566                                    (void *)&icp->icmp_ip);
  567                 break;
  568 
  569         badcode:
  570                 ICMPSTAT_INC(icps_badcode);
  571                 break;
  572 
  573         case ICMP_ECHO:
  574                 if (!V_icmpbmcastecho
  575                     && (m->m_flags & (M_MCAST | M_BCAST)) != 0) {
  576                         ICMPSTAT_INC(icps_bmcastecho);
  577                         break;
  578                 }
  579                 if (badport_bandlim(BANDLIM_ICMP_ECHO) < 0)
  580                         goto freeit;
  581                 icp->icmp_type = ICMP_ECHOREPLY;
  582                 goto reflect;
  583 
  584         case ICMP_TSTAMP:
  585                 if (V_icmptstamprepl == 0)
  586                         break;
  587                 if (!V_icmpbmcastecho
  588                     && (m->m_flags & (M_MCAST | M_BCAST)) != 0) {
  589                         ICMPSTAT_INC(icps_bmcasttstamp);
  590                         break;
  591                 }
  592                 if (icmplen < ICMP_TSLEN) {
  593                         ICMPSTAT_INC(icps_badlen);
  594                         break;
  595                 }
  596                 if (badport_bandlim(BANDLIM_ICMP_TSTAMP) < 0)
  597                         goto freeit;
  598                 icp->icmp_type = ICMP_TSTAMPREPLY;
  599                 icp->icmp_rtime = iptime();
  600                 icp->icmp_ttime = icp->icmp_rtime;      /* bogus, do later! */
  601                 goto reflect;
  602 
  603         case ICMP_MASKREQ:
  604                 if (V_icmpmaskrepl == 0)
  605                         break;
  606                 /*
  607                  * We are not able to respond with all ones broadcast
  608                  * unless we receive it over a point-to-point interface.
  609                  */
  610                 if (icmplen < ICMP_MASKLEN)
  611                         break;
  612                 switch (ip->ip_dst.s_addr) {
  613 
  614                 case INADDR_BROADCAST:
  615                 case INADDR_ANY:
  616                         icmpdst.sin_addr = ip->ip_src;
  617                         break;
  618 
  619                 default:
  620                         icmpdst.sin_addr = ip->ip_dst;
  621                 }
  622                 ia = (struct in_ifaddr *)ifaof_ifpforaddr(
  623                             (struct sockaddr *)&icmpdst, m->m_pkthdr.rcvif);
  624                 if (ia == NULL)
  625                         break;
  626                 if (ia->ia_ifp == NULL) 
  627                         break;
  628                 icp->icmp_type = ICMP_MASKREPLY;
  629                 if (V_icmpmaskfake == 0)
  630                         icp->icmp_mask = ia->ia_sockmask.sin_addr.s_addr;
  631                 else
  632                         icp->icmp_mask = V_icmpmaskfake;
  633                 if (ip->ip_src.s_addr == 0) {
  634                         if (ia->ia_ifp->if_flags & IFF_BROADCAST)
  635                             ip->ip_src = satosin(&ia->ia_broadaddr)->sin_addr;
  636                         else if (ia->ia_ifp->if_flags & IFF_POINTOPOINT)
  637                             ip->ip_src = satosin(&ia->ia_dstaddr)->sin_addr;
  638                 }
  639 reflect:
  640                 ICMPSTAT_INC(icps_reflect);
  641                 ICMPSTAT_INC(icps_outhist[icp->icmp_type]);
  642                 icmp_reflect(m);
  643                 NET_EPOCH_EXIT(et);
  644                 return (IPPROTO_DONE);
  645 
  646         case ICMP_REDIRECT:
  647                 if (V_log_redirect) {
  648                         u_long src, dst, gw;
  649 
  650                         src = ntohl(ip->ip_src.s_addr);
  651                         dst = ntohl(icp->icmp_ip.ip_dst.s_addr);
  652                         gw = ntohl(icp->icmp_gwaddr.s_addr);
  653                         printf("icmp redirect from %d.%d.%d.%d: "
  654                                "%d.%d.%d.%d => %d.%d.%d.%d\n",
  655                                (int)(src >> 24), (int)((src >> 16) & 0xff),
  656                                (int)((src >> 8) & 0xff), (int)(src & 0xff),
  657                                (int)(dst >> 24), (int)((dst >> 16) & 0xff),
  658                                (int)((dst >> 8) & 0xff), (int)(dst & 0xff),
  659                                (int)(gw >> 24), (int)((gw >> 16) & 0xff),
  660                                (int)((gw >> 8) & 0xff), (int)(gw & 0xff));
  661                 }
  662                 /*
  663                  * RFC1812 says we must ignore ICMP redirects if we
  664                  * are acting as router.
  665                  */
  666                 if (V_drop_redirect || V_ipforwarding)
  667                         break;
  668                 if (code > 3)
  669                         goto badcode;
  670                 if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp) ||
  671                     icp->icmp_ip.ip_hl < (sizeof(struct ip) >> 2)) {
  672                         ICMPSTAT_INC(icps_badlen);
  673                         break;
  674                 }
  675                 /*
  676                  * Short circuit routing redirects to force
  677                  * immediate change in the kernel's routing
  678                  * tables.  The message is also handed to anyone
  679                  * listening on a raw socket (e.g. the routing
  680                  * daemon for use in updating its tables).
  681                  */
  682                 icmpgw.sin_addr = ip->ip_src;
  683                 icmpdst.sin_addr = icp->icmp_gwaddr;
  684 #ifdef  ICMPPRINTFS
  685                 if (icmpprintfs) {
  686                         char dstbuf[INET_ADDRSTRLEN];
  687                         char gwbuf[INET_ADDRSTRLEN];
  688 
  689                         printf("redirect dst %s to %s\n",
  690                                inet_ntoa_r(icp->icmp_ip.ip_dst, dstbuf),
  691                                inet_ntoa_r(icp->icmp_gwaddr, gwbuf));
  692                 }
  693 #endif
  694                 icmpsrc.sin_addr = icp->icmp_ip.ip_dst;
  695                 for ( fibnum = 0; fibnum < rt_numfibs; fibnum++) {
  696                         in_rtredirect((struct sockaddr *)&icmpsrc,
  697                           (struct sockaddr *)&icmpdst,
  698                           (struct sockaddr *)0, RTF_GATEWAY | RTF_HOST,
  699                           (struct sockaddr *)&icmpgw, fibnum);
  700                 }
  701                 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&icmpsrc);
  702                 break;
  703 
  704         /*
  705          * No kernel processing for the following;
  706          * just fall through to send to raw listener.
  707          */
  708         case ICMP_ECHOREPLY:
  709         case ICMP_ROUTERADVERT:
  710         case ICMP_ROUTERSOLICIT:
  711         case ICMP_TSTAMPREPLY:
  712         case ICMP_IREQREPLY:
  713         case ICMP_MASKREPLY:
  714         case ICMP_SOURCEQUENCH:
  715         default:
  716                 break;
  717         }
  718 
  719 raw:
  720         NET_EPOCH_EXIT(et);
  721         *mp = m;
  722         rip_input(mp, offp, proto);
  723         return (IPPROTO_DONE);
  724 
  725 freeit:
  726         NET_EPOCH_EXIT(et);
  727         m_freem(m);
  728         return (IPPROTO_DONE);
  729 }
  730 
  731 /*
  732  * Reflect the ip packet back to the source
  733  */
  734 static void
  735 icmp_reflect(struct mbuf *m)
  736 {
  737         struct rm_priotracker in_ifa_tracker;
  738         struct epoch_tracker et;
  739         struct ip *ip = mtod(m, struct ip *);
  740         struct ifaddr *ifa;
  741         struct ifnet *ifp;
  742         struct in_ifaddr *ia;
  743         struct in_addr t;
  744         struct nhop4_extended nh_ext;
  745         struct mbuf *opts = NULL;
  746         int optlen = (ip->ip_hl << 2) - sizeof(struct ip);
  747 
  748         if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)) ||
  749             IN_EXPERIMENTAL(ntohl(ip->ip_src.s_addr)) ||
  750             IN_ZERONET(ntohl(ip->ip_src.s_addr)) ) {
  751                 m_freem(m);     /* Bad return address */
  752                 ICMPSTAT_INC(icps_badaddr);
  753                 goto done;      /* Ip_output() will check for broadcast */
  754         }
  755 
  756         t = ip->ip_dst;
  757         ip->ip_dst = ip->ip_src;
  758 
  759         /*
  760          * Source selection for ICMP replies:
  761          *
  762          * If the incoming packet was addressed directly to one of our
  763          * own addresses, use dst as the src for the reply.
  764          */
  765         IN_IFADDR_RLOCK(&in_ifa_tracker);
  766         LIST_FOREACH(ia, INADDR_HASH(t.s_addr), ia_hash) {
  767                 if (t.s_addr == IA_SIN(ia)->sin_addr.s_addr) {
  768                         t = IA_SIN(ia)->sin_addr;
  769                         IN_IFADDR_RUNLOCK(&in_ifa_tracker);
  770                         goto match;
  771                 }
  772         }
  773         IN_IFADDR_RUNLOCK(&in_ifa_tracker);
  774 
  775         /*
  776          * If the incoming packet was addressed to one of our broadcast
  777          * addresses, use the first non-broadcast address which corresponds
  778          * to the incoming interface.
  779          */
  780         ifp = m->m_pkthdr.rcvif;
  781         if (ifp != NULL && ifp->if_flags & IFF_BROADCAST) {
  782                 NET_EPOCH_ENTER(et);
  783                 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  784                         if (ifa->ifa_addr->sa_family != AF_INET)
  785                                 continue;
  786                         ia = ifatoia(ifa);
  787                         if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
  788                             t.s_addr) {
  789                                 t = IA_SIN(ia)->sin_addr;
  790                                 NET_EPOCH_EXIT(et);
  791                                 goto match;
  792                         }
  793                 }
  794                 NET_EPOCH_EXIT(et);
  795         }
  796         /*
  797          * If the packet was transiting through us, use the address of
  798          * the interface the packet came through in.  If that interface
  799          * doesn't have a suitable IP address, the normal selection
  800          * criteria apply.
  801          */
  802         if (V_icmp_rfi && ifp != NULL) {
  803                 NET_EPOCH_ENTER(et);
  804                 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  805                         if (ifa->ifa_addr->sa_family != AF_INET)
  806                                 continue;
  807                         ia = ifatoia(ifa);
  808                         t = IA_SIN(ia)->sin_addr;
  809                         NET_EPOCH_EXIT(et);
  810                         goto match;
  811                 }
  812                 NET_EPOCH_EXIT(et);
  813         }
  814         /*
  815          * If the incoming packet was not addressed directly to us, use
  816          * designated interface for icmp replies specified by sysctl
  817          * net.inet.icmp.reply_src (default not set). Otherwise continue
  818          * with normal source selection.
  819          */
  820         if (V_reply_src[0] != '\0' && (ifp = ifunit(V_reply_src))) {
  821                 NET_EPOCH_ENTER(et);
  822                 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  823                         if (ifa->ifa_addr->sa_family != AF_INET)
  824                                 continue;
  825                         ia = ifatoia(ifa);
  826                         t = IA_SIN(ia)->sin_addr;
  827                         NET_EPOCH_EXIT(et);
  828                         goto match;
  829                 }
  830                 NET_EPOCH_EXIT(et);
  831         }
  832         /*
  833          * If the packet was transiting through us, use the address of
  834          * the interface that is the closest to the packet source.
  835          * When we don't have a route back to the packet source, stop here
  836          * and drop the packet.
  837          */
  838         if (fib4_lookup_nh_ext(M_GETFIB(m), ip->ip_dst, 0, 0, &nh_ext) != 0) {
  839                 m_freem(m);
  840                 ICMPSTAT_INC(icps_noroute);
  841                 goto done;
  842         }
  843         t = nh_ext.nh_src;
  844 match:
  845 #ifdef MAC
  846         mac_netinet_icmp_replyinplace(m);
  847 #endif
  848         ip->ip_src = t;
  849         ip->ip_ttl = V_ip_defttl;
  850 
  851         if (optlen > 0) {
  852                 u_char *cp;
  853                 int opt, cnt;
  854                 u_int len;
  855 
  856                 /*
  857                  * Retrieve any source routing from the incoming packet;
  858                  * add on any record-route or timestamp options.
  859                  */
  860                 cp = (u_char *) (ip + 1);
  861                 if ((opts = ip_srcroute(m)) == NULL &&
  862                     (opts = m_gethdr(M_NOWAIT, MT_DATA))) {
  863                         opts->m_len = sizeof(struct in_addr);
  864                         mtod(opts, struct in_addr *)->s_addr = 0;
  865                 }
  866                 if (opts) {
  867 #ifdef ICMPPRINTFS
  868                     if (icmpprintfs)
  869                             printf("icmp_reflect optlen %d rt %d => ",
  870                                 optlen, opts->m_len);
  871 #endif
  872                     for (cnt = optlen; cnt > 0; cnt -= len, cp += len) {
  873                             opt = cp[IPOPT_OPTVAL];
  874                             if (opt == IPOPT_EOL)
  875                                     break;
  876                             if (opt == IPOPT_NOP)
  877                                     len = 1;
  878                             else {
  879                                     if (cnt < IPOPT_OLEN + sizeof(*cp))
  880                                             break;
  881                                     len = cp[IPOPT_OLEN];
  882                                     if (len < IPOPT_OLEN + sizeof(*cp) ||
  883                                         len > cnt)
  884                                             break;
  885                             }
  886                             /*
  887                              * Should check for overflow, but it "can't happen"
  888                              */
  889                             if (opt == IPOPT_RR || opt == IPOPT_TS ||
  890                                 opt == IPOPT_SECURITY) {
  891                                     bcopy((caddr_t)cp,
  892                                         mtod(opts, caddr_t) + opts->m_len, len);
  893                                     opts->m_len += len;
  894                             }
  895                     }
  896                     /* Terminate & pad, if necessary */
  897                     cnt = opts->m_len % 4;
  898                     if (cnt) {
  899                             for (; cnt < 4; cnt++) {
  900                                     *(mtod(opts, caddr_t) + opts->m_len) =
  901                                         IPOPT_EOL;
  902                                     opts->m_len++;
  903                             }
  904                     }
  905 #ifdef ICMPPRINTFS
  906                     if (icmpprintfs)
  907                             printf("%d\n", opts->m_len);
  908 #endif
  909                 }
  910                 ip_stripoptions(m);
  911         }
  912         m_tag_delete_nonpersistent(m);
  913         m->m_flags &= ~(M_BCAST|M_MCAST);
  914         icmp_send(m, opts);
  915 done:
  916         if (opts)
  917                 (void)m_free(opts);
  918 }
  919 
  920 /*
  921  * Send an icmp packet back to the ip level,
  922  * after supplying a checksum.
  923  */
  924 static void
  925 icmp_send(struct mbuf *m, struct mbuf *opts)
  926 {
  927         struct ip *ip = mtod(m, struct ip *);
  928         int hlen;
  929         struct icmp *icp;
  930 
  931         hlen = ip->ip_hl << 2;
  932         m->m_data += hlen;
  933         m->m_len -= hlen;
  934         icp = mtod(m, struct icmp *);
  935         icp->icmp_cksum = 0;
  936         icp->icmp_cksum = in_cksum(m, ntohs(ip->ip_len) - hlen);
  937         m->m_data -= hlen;
  938         m->m_len += hlen;
  939         m->m_pkthdr.rcvif = (struct ifnet *)0;
  940 #ifdef ICMPPRINTFS
  941         if (icmpprintfs) {
  942                 char dstbuf[INET_ADDRSTRLEN];
  943                 char srcbuf[INET_ADDRSTRLEN];
  944 
  945                 printf("icmp_send dst %s src %s\n",
  946                     inet_ntoa_r(ip->ip_dst, dstbuf),
  947                     inet_ntoa_r(ip->ip_src, srcbuf));
  948         }
  949 #endif
  950         (void) ip_output(m, opts, NULL, 0, NULL, NULL);
  951 }
  952 
  953 /*
  954  * Return milliseconds since 00:00 UTC in network format.
  955  */
  956 uint32_t
  957 iptime(void)
  958 {
  959         struct timeval atv;
  960         u_long t;
  961 
  962         getmicrotime(&atv);
  963         t = (atv.tv_sec % (24*60*60)) * 1000 + atv.tv_usec / 1000;
  964         return (htonl(t));
  965 }
  966 
  967 /*
  968  * Return the next larger or smaller MTU plateau (table from RFC 1191)
  969  * given current value MTU.  If DIR is less than zero, a larger plateau
  970  * is returned; otherwise, a smaller value is returned.
  971  */
  972 int
  973 ip_next_mtu(int mtu, int dir)
  974 {
  975         static int mtutab[] = {
  976                 65535, 32000, 17914, 8166, 4352, 2002, 1492, 1280, 1006, 508,
  977                 296, 68, 0
  978         };
  979         int i, size;
  980 
  981         size = (sizeof mtutab) / (sizeof mtutab[0]);
  982         if (dir >= 0) {
  983                 for (i = 0; i < size; i++)
  984                         if (mtu > mtutab[i])
  985                                 return mtutab[i];
  986         } else {
  987                 for (i = size - 1; i >= 0; i--)
  988                         if (mtu < mtutab[i])
  989                                 return mtutab[i];
  990                 if (mtu == mtutab[0])
  991                         return mtutab[0];
  992         }
  993         return 0;
  994 }
  995 #endif /* INET */
  996 
  997 
  998 /*
  999  * badport_bandlim() - check for ICMP bandwidth limit
 1000  *
 1001  *      Return 0 if it is ok to send an ICMP error response, -1 if we have
 1002  *      hit our bandwidth limit and it is not ok.
 1003  *
 1004  *      If icmplim is <= 0, the feature is disabled and 0 is returned.
 1005  *
 1006  *      For now we separate the TCP and UDP subsystems w/ different 'which'
 1007  *      values.  We may eventually remove this separation (and simplify the
 1008  *      code further).
 1009  *
 1010  *      Note that the printing of the error message is delayed so we can
 1011  *      properly print the icmp error rate that the system was trying to do
 1012  *      (i.e. 22000/100 pps, etc...).  This can cause long delays in printing
 1013  *      the 'final' error, but it doesn't make sense to solve the printing
 1014  *      delay with more complex code.
 1015  */
 1016 struct icmp_rate {
 1017         const char *descr;
 1018         struct counter_rate cr;
 1019 };
 1020 VNET_DEFINE_STATIC(struct icmp_rate, icmp_rates[BANDLIM_MAX]) = {
 1021         { "icmp unreach response" },
 1022         { "icmp ping response" },
 1023         { "icmp tstamp response" },
 1024         { "closed port RST response" },
 1025         { "open port RST response" },
 1026         { "icmp6 unreach response" },
 1027         { "sctp ootb response" }
 1028 };
 1029 #define V_icmp_rates    VNET(icmp_rates)
 1030 
 1031 static void
 1032 icmp_bandlimit_init(void)
 1033 {
 1034 
 1035         for (int i = 0; i < BANDLIM_MAX; i++) {
 1036                 V_icmp_rates[i].cr.cr_rate = counter_u64_alloc(M_WAITOK);
 1037                 V_icmp_rates[i].cr.cr_ticks = ticks;
 1038         }
 1039 }
 1040 VNET_SYSINIT(icmp_bandlimit, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY,
 1041     icmp_bandlimit_init, NULL);
 1042 
 1043 static void
 1044 icmp_bandlimit_uninit(void)
 1045 {
 1046 
 1047         for (int i = 0; i < BANDLIM_MAX; i++)
 1048                 counter_u64_free(V_icmp_rates[i].cr.cr_rate);
 1049 }
 1050 VNET_SYSUNINIT(icmp_bandlimit, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD,
 1051     icmp_bandlimit_uninit, NULL);
 1052 
 1053 int
 1054 badport_bandlim(int which)
 1055 {
 1056         int64_t pps;
 1057 
 1058         if (V_icmplim == 0 || which == BANDLIM_UNLIMITED)
 1059                 return (0);
 1060 
 1061         KASSERT(which >= 0 && which < BANDLIM_MAX,
 1062             ("%s: which %d", __func__, which));
 1063 
 1064         pps = counter_ratecheck(&V_icmp_rates[which].cr, V_icmplim);
 1065         if (pps == -1)
 1066                 return (-1);
 1067         if (pps > 0 && V_icmplim_output)
 1068                 log(LOG_NOTICE, "Limiting %s from %jd to %d packets/sec\n",
 1069                         V_icmp_rates[which].descr, (intmax_t )pps, V_icmplim);
 1070         return (0);
 1071 }

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