sys/netpfil/ipfw/ip_fw_log.c

   1 /*-
   2  * Copyright (c) 2002-2009 Luigi Rizzo, Universita` di Pisa
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 __FBSDID("$FreeBSD$");
  28
  29 /*
  30  * Logging support for ipfw
  31  */
  32
  33 #include "opt_ipfw.h"
  34 #include "opt_inet.h"
  35 #ifndef INET
  36 #error IPFIREWALL requires INET.
  37 #endif /* INET */
  38 #include "opt_inet6.h"
  39
  40 #include <sys/param.h>
  41 #include <sys/systm.h>
  42 #include <sys/mbuf.h>
  43 #include <sys/kernel.h>
  44 #include <sys/socket.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/syslog.h>
  47 #include <net/ethernet.h> /* for ETHERTYPE_IP */
  48 #include <net/if.h>
  49 #include <net/vnet.h>
  50 #include <net/if_types.h>       /* for IFT_ETHER */
  51 #include <net/bpf.h>            /* for BPF */
  52
  53 #include <netinet/in.h>
  54 #include <netinet/ip.h>
  55 #include <netinet/ip_icmp.h>
  56 #include <netinet/ip_var.h>
  57 #include <netinet/ip_fw.h>
  58 #include <netinet/tcp_var.h>
  59 #include <netinet/udp.h>
  60
  61 #include <netinet/ip6.h>
  62 #include <netinet/icmp6.h>
  63 #ifdef INET6
  64 #include <netinet6/in6_var.h>   /* ip6_sprintf() */
  65 #endif
  66
  67 #include <netpfil/ipfw/ip_fw_private.h>
  68
  69 #ifdef MAC
  70 #include <security/mac/mac_framework.h>
  71 #endif
  72
  73 /*
  74  * L3HDR maps an ipv4 pointer into a layer3 header pointer of type T
  75  * Other macros just cast void * into the appropriate type
  76  */
  77 #define L3HDR(T, ip)    ((T *)((u_int32_t *)(ip) + (ip)->ip_hl))
  78 #define TCP(p)          ((struct tcphdr *)(p))
  79 #define SCTP(p)         ((struct sctphdr *)(p))
  80 #define UDP(p)          ((struct udphdr *)(p))
  81 #define ICMP(p)         ((struct icmphdr *)(p))
  82 #define ICMP6(p)        ((struct icmp6_hdr *)(p))
  83
  84 #define SNPARGS(buf, len) buf + len, sizeof(buf) > len ? sizeof(buf) - len : 0
  85 #define SNP(buf) buf, sizeof(buf)
  86
  87 #ifdef WITHOUT_BPF
  88 void
  89 ipfw_log_bpf(int onoff)
  90 {
  91 }
  92 #else /* !WITHOUT_BPF */
  93 static struct ifnet *log_if;    /* hook to attach to bpf */
  94
  95 /* we use this dummy function for all ifnet callbacks */
  96 static int
  97 log_dummy(struct ifnet *ifp, u_long cmd, caddr_t addr)
  98 {
  99         return EINVAL;
 100 }
 101
 102 static int
 103 ipfw_log_output(struct ifnet *ifp, struct mbuf *m,
 104         struct sockaddr *dst, struct route *ro)
 105 {
 106         if (m != NULL)
 107                 m_freem(m);
 108         return EINVAL;
 109 }
 110
 111 static void
 112 ipfw_log_start(struct ifnet* ifp)
 113 {
 114         panic("ipfw_log_start() must not be called");
 115 }
 116
 117 static const u_char ipfwbroadcastaddr[6] =
 118         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 119
 120 void
 121 ipfw_log_bpf(int onoff)
 122 {
 123         struct ifnet *ifp;
 124
 125         if (onoff) {
 126                 if (log_if)
 127                         return;
 128                 ifp = if_alloc(IFT_ETHER);
 129                 if (ifp == NULL)
 130                         return;
 131                 if_initname(ifp, "ipfw", 0);
 132                 ifp->if_mtu = 65536;
 133                 ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST;
 134                 ifp->if_init = (void *)log_dummy;
 135                 ifp->if_ioctl = log_dummy;
 136                 ifp->if_start = ipfw_log_start;
 137                 ifp->if_output = ipfw_log_output;
 138                 ifp->if_addrlen = 6;
 139                 ifp->if_hdrlen = 14;
 140                 if_attach(ifp);
 141                 ifp->if_broadcastaddr = ipfwbroadcastaddr;
 142                 ifp->if_baudrate = IF_Mbps(10);
 143                 bpfattach(ifp, DLT_EN10MB, 14);
 144                 log_if = ifp;
 145         } else {
 146                 if (log_if) {
 147                         ether_ifdetach(log_if);
 148                         if_free(log_if);
 149                 }
 150                 log_if = NULL;
 151         }
 152 }
 153 #endif /* !WITHOUT_BPF */
 154
 155 /*
 156  * We enter here when we have a rule with O_LOG.
 157  * XXX this function alone takes about 2Kbytes of code!
 158  */
 159 void
 160 ipfw_log(struct ip_fw *f, u_int hlen, struct ip_fw_args *args,
 161     struct mbuf *m, struct ifnet *oif, u_short offset, uint32_t tablearg,
 162     struct ip *ip)
 163 {
 164         char *action;
 165         int limit_reached = 0;
 166         char action2[92], proto[128], fragment[32];
 167
 168         if (V_fw_verbose == 0) {
 169 #ifndef WITHOUT_BPF
 170
 171                 if (log_if == NULL || log_if->if_bpf == NULL)
 172                         return;
 173
 174                 if (args->eh) /* layer2, use orig hdr */
 175                         BPF_MTAP2(log_if, args->eh, ETHER_HDR_LEN, m);
 176                 else
 177                         /* Add fake header. Later we will store
 178                          * more info in the header.
 179                          */
 180                         BPF_MTAP2(log_if, "DDDDDDSSSSSS\x08\x00", ETHER_HDR_LEN, m);
 181 #endif /* !WITHOUT_BPF */
 182                 return;
 183         }
 184         /* the old 'log' function */
 185         fragment[0] = '\0';
 186         proto[0] = '\0';
 187
 188         if (f == NULL) {        /* bogus pkt */
 189                 if (V_verbose_limit != 0 && V_norule_counter >= V_verbose_limit)
 190                         return;
 191                 V_norule_counter++;
 192                 if (V_norule_counter == V_verbose_limit)
 193                         limit_reached = V_verbose_limit;
 194                 action = "Refuse";
 195         } else {        /* O_LOG is the first action, find the real one */
 196                 ipfw_insn *cmd = ACTION_PTR(f);
 197                 ipfw_insn_log *l = (ipfw_insn_log *)cmd;
 198
 199                 if (l->max_log != 0 && l->log_left == 0)
 200                         return;
 201                 l->log_left--;
 202                 if (l->log_left == 0)
 203                         limit_reached = l->max_log;
 204                 cmd += F_LEN(cmd);      /* point to first action */
 205                 if (cmd->opcode == O_ALTQ) {
 206                         ipfw_insn_altq *altq = (ipfw_insn_altq *)cmd;
 207
 208                         snprintf(SNPARGS(action2, 0), "Altq %d",
 209                                 altq->qid);
 210                         cmd += F_LEN(cmd);
 211                 }
 212                 if (cmd->opcode == O_PROB || cmd->opcode == O_TAG ||
 213                     cmd->opcode == O_SETDSCP)
 214                         cmd += F_LEN(cmd);
 215
 216                 action = action2;
 217                 switch (cmd->opcode) {
 218                 case O_DENY:
 219                         action = "Deny";
 220                         break;
 221
 222                 case O_REJECT:
 223                         if (cmd->arg1==ICMP_REJECT_RST)
 224                                 action = "Reset";
 225                         else if (cmd->arg1==ICMP_UNREACH_HOST)
 226                                 action = "Reject";
 227                         else
 228                                 snprintf(SNPARGS(action2, 0), "Unreach %d",
 229                                         cmd->arg1);
 230                         break;
 231
 232                 case O_UNREACH6:
 233                         if (cmd->arg1==ICMP6_UNREACH_RST)
 234                                 action = "Reset";
 235                         else
 236                                 snprintf(SNPARGS(action2, 0), "Unreach %d",
 237                                         cmd->arg1);
 238                         break;
 239
 240                 case O_ACCEPT:
 241                         action = "Accept";
 242                         break;
 243                 case O_COUNT:
 244                         action = "Count";
 245                         break;
 246                 case O_DIVERT:
 247                         snprintf(SNPARGS(action2, 0), "Divert %d",
 248                                 cmd->arg1);
 249                         break;
 250                 case O_TEE:
 251                         snprintf(SNPARGS(action2, 0), "Tee %d",
 252                                 cmd->arg1);
 253                         break;
 254                 case O_SETFIB:
 255                         snprintf(SNPARGS(action2, 0), "SetFib %d",
 256                                 IP_FW_ARG_TABLEARG(cmd->arg1));
 257                         break;
 258                 case O_SKIPTO:
 259                         snprintf(SNPARGS(action2, 0), "SkipTo %d",
 260                                 IP_FW_ARG_TABLEARG(cmd->arg1));
 261                         break;
 262                 case O_PIPE:
 263                         snprintf(SNPARGS(action2, 0), "Pipe %d",
 264                                 IP_FW_ARG_TABLEARG(cmd->arg1));
 265                         break;
 266                 case O_QUEUE:
 267                         snprintf(SNPARGS(action2, 0), "Queue %d",
 268                                 IP_FW_ARG_TABLEARG(cmd->arg1));
 269                         break;
 270                 case O_FORWARD_IP: {
 271                         ipfw_insn_sa *sa = (ipfw_insn_sa *)cmd;
 272                         int len;
 273                         struct in_addr dummyaddr;
 274                         if (sa->sa.sin_addr.s_addr == INADDR_ANY)
 275                                 dummyaddr.s_addr = htonl(tablearg);
 276                         else
 277                                 dummyaddr.s_addr = sa->sa.sin_addr.s_addr;
 278
 279                         len = snprintf(SNPARGS(action2, 0), "Forward to %s",
 280                                 inet_ntoa(dummyaddr));
 281
 282                         if (sa->sa.sin_port)
 283                                 snprintf(SNPARGS(action2, len), ":%d",
 284                                     sa->sa.sin_port);
 285                         }
 286                         break;
 287 #ifdef INET6
 288                 case O_FORWARD_IP6: {
 289                         char buf[INET6_ADDRSTRLEN];
 290                         ipfw_insn_sa6 *sa = (ipfw_insn_sa6 *)cmd;
 291                         int len;
 292
 293                         len = snprintf(SNPARGS(action2, 0), "Forward to [%s]",
 294                             ip6_sprintf(buf, &sa->sa.sin6_addr));
 295
 296                         if (sa->sa.sin6_port)
 297                                 snprintf(SNPARGS(action2, len), ":%u",
 298                                     sa->sa.sin6_port);
 299                         }
 300                         break;
 301 #endif
 302                 case O_NETGRAPH:
 303                         snprintf(SNPARGS(action2, 0), "Netgraph %d",
 304                                 cmd->arg1);
 305                         break;
 306                 case O_NGTEE:
 307                         snprintf(SNPARGS(action2, 0), "Ngtee %d",
 308                                 cmd->arg1);
 309                         break;
 310                 case O_NAT:
 311                         action = "Nat";
 312                         break;
 313                 case O_REASS:
 314                         action = "Reass";
 315                         break;
 316                 case O_CALLRETURN:
 317                         if (cmd->len & F_NOT)
 318                                 action = "Return";
 319                         else
 320                                 snprintf(SNPARGS(action2, 0), "Call %d",
 321                                     cmd->arg1);
 322                         break;
 323                 default:
 324                         action = "UNKNOWN";
 325                         break;
 326                 }
 327         }
 328
 329         if (hlen == 0) {        /* non-ip */
 330                 snprintf(SNPARGS(proto, 0), "MAC");
 331
 332         } else {
 333                 int len;
 334 #ifdef INET6
 335                 char src[INET6_ADDRSTRLEN + 2], dst[INET6_ADDRSTRLEN + 2];
 336 #else
 337                 char src[INET_ADDRSTRLEN], dst[INET_ADDRSTRLEN];
 338 #endif
 339                 struct icmphdr *icmp;
 340                 struct tcphdr *tcp;
 341                 struct udphdr *udp;
 342 #ifdef INET6
 343                 struct ip6_hdr *ip6 = NULL;
 344                 struct icmp6_hdr *icmp6;
 345                 u_short ip6f_mf;
 346 #endif
 347                 src[0] = '\0';
 348                 dst[0] = '\0';
 349 #ifdef INET6
 350                 ip6f_mf = offset & IP6F_MORE_FRAG;
 351                 offset &= IP6F_OFF_MASK;
 352
 353                 if (IS_IP6_FLOW_ID(&(args->f_id))) {
 354                         char ip6buf[INET6_ADDRSTRLEN];
 355                         snprintf(src, sizeof(src), "[%s]",
 356                             ip6_sprintf(ip6buf, &args->f_id.src_ip6));
 357                         snprintf(dst, sizeof(dst), "[%s]",
 358                             ip6_sprintf(ip6buf, &args->f_id.dst_ip6));
 359
 360                         ip6 = (struct ip6_hdr *)ip;
 361                         tcp = (struct tcphdr *)(((char *)ip) + hlen);
 362                         udp = (struct udphdr *)(((char *)ip) + hlen);
 363                 } else
 364 #endif
 365                 {
 366                         tcp = L3HDR(struct tcphdr, ip);
 367                         udp = L3HDR(struct udphdr, ip);
 368
 369                         inet_ntop(AF_INET, &ip->ip_src, src, sizeof(src));
 370                         inet_ntop(AF_INET, &ip->ip_dst, dst, sizeof(dst));
 371                 }
 372
 373                 switch (args->f_id.proto) {
 374                 case IPPROTO_TCP:
 375                         len = snprintf(SNPARGS(proto, 0), "TCP %s", src);
 376                         if (offset == 0)
 377                                 snprintf(SNPARGS(proto, len), ":%d %s:%d",
 378                                     ntohs(tcp->th_sport),
 379                                     dst,
 380                                     ntohs(tcp->th_dport));
 381                         else
 382                                 snprintf(SNPARGS(proto, len), " %s", dst);
 383                         break;
 384
 385                 case IPPROTO_UDP:
 386                         len = snprintf(SNPARGS(proto, 0), "UDP %s", src);
 387                         if (offset == 0)
 388                                 snprintf(SNPARGS(proto, len), ":%d %s:%d",
 389                                     ntohs(udp->uh_sport),
 390                                     dst,
 391                                     ntohs(udp->uh_dport));
 392                         else
 393                                 snprintf(SNPARGS(proto, len), " %s", dst);
 394                         break;
 395
 396                 case IPPROTO_ICMP:
 397                         icmp = L3HDR(struct icmphdr, ip);
 398                         if (offset == 0)
 399                                 len = snprintf(SNPARGS(proto, 0),
 400                                     "ICMP:%u.%u ",
 401                                     icmp->icmp_type, icmp->icmp_code);
 402                         else
 403                                 len = snprintf(SNPARGS(proto, 0), "ICMP ");
 404                         len += snprintf(SNPARGS(proto, len), "%s", src);
 405                         snprintf(SNPARGS(proto, len), " %s", dst);
 406                         break;
 407 #ifdef INET6
 408                 case IPPROTO_ICMPV6:
 409                         icmp6 = (struct icmp6_hdr *)(((char *)ip) + hlen);
 410                         if (offset == 0)
 411                                 len = snprintf(SNPARGS(proto, 0),
 412                                     "ICMPv6:%u.%u ",
 413                                     icmp6->icmp6_type, icmp6->icmp6_code);
 414                         else
 415                                 len = snprintf(SNPARGS(proto, 0), "ICMPv6 ");
 416                         len += snprintf(SNPARGS(proto, len), "%s", src);
 417                         snprintf(SNPARGS(proto, len), " %s", dst);
 418                         break;
 419 #endif
 420                 default:
 421                         len = snprintf(SNPARGS(proto, 0), "P:%d %s",
 422                             args->f_id.proto, src);
 423                         snprintf(SNPARGS(proto, len), " %s", dst);
 424                         break;
 425                 }
 426
 427 #ifdef INET6
 428                 if (IS_IP6_FLOW_ID(&(args->f_id))) {
 429                         if (offset & (IP6F_OFF_MASK | IP6F_MORE_FRAG))
 430                                 snprintf(SNPARGS(fragment, 0),
 431                                     " (frag %08x:%d@%d%s)",
 432                                     args->f_id.extra,
 433                                     ntohs(ip6->ip6_plen) - hlen,
 434                                     ntohs(offset) << 3, ip6f_mf ? "+" : "");
 435                 } else
 436 #endif
 437                 {
 438                         int ipoff, iplen;
 439                         ipoff = ntohs(ip->ip_off);
 440                         iplen = ntohs(ip->ip_len);
 441                         if (ipoff & (IP_MF | IP_OFFMASK))
 442                                 snprintf(SNPARGS(fragment, 0),
 443                                     " (frag %d:%d@%d%s)",
 444                                     ntohs(ip->ip_id), iplen - (ip->ip_hl << 2),
 445                                     offset << 3,
 446                                     (ipoff & IP_MF) ? "+" : "");
 447                 }
 448         }
 449 #ifdef __FreeBSD__
 450         if (oif || m->m_pkthdr.rcvif)
 451                 log(LOG_SECURITY | LOG_INFO,
 452                     "ipfw: %d %s %s %s via %s%s\n",
 453                     f ? f->rulenum : -1,
 454                     action, proto, oif ? "out" : "in",
 455                     oif ? oif->if_xname : m->m_pkthdr.rcvif->if_xname,
 456                     fragment);
 457         else
 458 #endif
 459                 log(LOG_SECURITY | LOG_INFO,
 460                     "ipfw: %d %s %s [no if info]%s\n",
 461                     f ? f->rulenum : -1,
 462                     action, proto, fragment);
 463         if (limit_reached)
 464                 log(LOG_SECURITY | LOG_NOTICE,
 465                     "ipfw: limit %d reached on entry %d\n",
 466                     limit_reached, f ? f->rulenum : -1);
 467 }
 468 /* end of file */