sys/netinet/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 #if !defined(KLD_MODULE)
  35 #include "opt_ipdivert.h"
  36 #include "opt_ipdn.h"
  37 #include "opt_inet.h"
  38 #ifndef INET
  39 #error IPFIREWALL requires INET.
  40 #endif /* INET */
  41 #endif
  42 #include "opt_inet6.h"
  43 #include "opt_ipsec.h"
  44
  45 #include <sys/param.h>
  46 #include <sys/systm.h>
  47 #include <sys/mbuf.h>
  48 #include <sys/kernel.h>
  49 #include <sys/socket.h>
  50 #include <sys/sysctl.h>
  51 #include <sys/syslog.h>
  52 #include <net/ethernet.h> /* for ETHERTYPE_IP */
  53 #include <net/if.h>
  54 #include <net/vnet.h>
  55 #include <net/if_types.h>       /* for IFT_ETHER */
  56 #include <net/bpf.h>            /* for BPF */
  57
  58 #include <netinet/in.h>
  59 #include <netinet/ip.h>
  60 #include <netinet/ip_icmp.h>
  61 #include <netinet/ip_var.h>
  62 #include <netinet/ip_fw.h>
  63 #include <netinet/ipfw/ip_fw_private.h>
  64 #include <netinet/tcp_var.h>
  65 #include <netinet/udp.h>
  66
  67 #include <netinet/ip6.h>
  68 #include <netinet/icmp6.h>
  69 #ifdef INET6
  70 #include <netinet6/in6_var.h>   /* ip6_sprintf() */
  71 #endif
  72
  73 #ifdef MAC
  74 #include <security/mac/mac_framework.h>
  75 #endif
  76
  77 /*
  78  * L3HDR maps an ipv4 pointer into a layer3 header pointer of type T
  79  * Other macros just cast void * into the appropriate type
  80  */
  81 #define L3HDR(T, ip)    ((T *)((u_int32_t *)(ip) + (ip)->ip_hl))
  82 #define TCP(p)          ((struct tcphdr *)(p))
  83 #define SCTP(p)         ((struct sctphdr *)(p))
  84 #define UDP(p)          ((struct udphdr *)(p))
  85 #define ICMP(p)         ((struct icmphdr *)(p))
  86 #define ICMP6(p)        ((struct icmp6_hdr *)(p))
  87
  88 #define SNPARGS(buf, len) buf + len, sizeof(buf) > len ? sizeof(buf) - len : 0
  89 #define SNP(buf) buf, sizeof(buf)
  90
  91 #ifdef WITHOUT_BPF
  92 void
  93 ipfw_log_bpf(int onoff)
  94 {
  95 }
  96 #else /* !WITHOUT_BPF */
  97 static struct ifnet *log_if;    /* hook to attach to bpf */
  98
  99 /* we use this dummy function for all ifnet callbacks */
 100 static int
 101 log_dummy(struct ifnet *ifp, u_long cmd, caddr_t addr)
 102 {
 103         return EINVAL;
 104 }
 105
 106 static int
 107 ipfw_log_output(struct ifnet *ifp, struct mbuf *m,
 108         struct sockaddr *dst, struct route *ro)
 109 {
 110         if (m != NULL)
 111                 m_freem(m);
 112         return EINVAL;
 113 }
 114
 115 static void
 116 ipfw_log_start(struct ifnet* ifp)
 117 {
 118         panic("ipfw_log_start() must not be called");
 119 }
 120
 121 static const u_char ipfwbroadcastaddr[6] =
 122         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 123
 124 void
 125 ipfw_log_bpf(int onoff)
 126 {
 127         struct ifnet *ifp;
 128
 129         if (onoff) {
 130                 if (log_if)
 131                         return;
 132                 ifp = if_alloc(IFT_ETHER);
 133                 if (ifp == NULL)
 134                         return;
 135                 if_initname(ifp, "ipfw", 0);
 136                 ifp->if_mtu = 65536;
 137                 ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST;
 138                 ifp->if_init = (void *)log_dummy;
 139                 ifp->if_ioctl = log_dummy;
 140                 ifp->if_start = ipfw_log_start;
 141                 ifp->if_output = ipfw_log_output;
 142                 ifp->if_addrlen = 6;
 143                 ifp->if_hdrlen = 14;
 144                 if_attach(ifp);
 145                 ifp->if_broadcastaddr = ipfwbroadcastaddr;
 146                 ifp->if_baudrate = IF_Mbps(10);
 147                 bpfattach(ifp, DLT_EN10MB, 14);
 148                 log_if = ifp;
 149         } else {
 150                 if (log_if) {
 151                         ether_ifdetach(log_if);
 152                         if_free(log_if);
 153                 }
 154                 log_if = NULL;
 155         }
 156 }
 157 #endif /* !WITHOUT_BPF */
 158
 159 /*
 160  * We enter here when we have a rule with O_LOG.
 161  * XXX this function alone takes about 2Kbytes of code!
 162  */
 163 void
 164 ipfw_log(struct ip_fw *f, u_int hlen, struct ip_fw_args *args,
 165     struct mbuf *m, struct ifnet *oif, u_short offset, uint32_t tablearg,
 166     struct ip *ip)
 167 {
 168         char *action;
 169         int limit_reached = 0;
 170         char action2[92], proto[128], fragment[32];
 171
 172         if (V_fw_verbose == 0) {
 173 #ifndef WITHOUT_BPF
 174
 175                 if (log_if == NULL || log_if->if_bpf == NULL)
 176                         return;
 177
 178                 if (args->eh) /* layer2, use orig hdr */
 179                         BPF_MTAP2(log_if, args->eh, ETHER_HDR_LEN, m);
 180                 else
 181                         /* Add fake header. Later we will store
 182                          * more info in the header.
 183                          */
 184                         BPF_MTAP2(log_if, "DDDDDDSSSSSS\x08\x00", ETHER_HDR_LEN, m);
 185 #endif /* !WITHOUT_BPF */
 186                 return;
 187         }
 188         /* the old 'log' function */
 189         fragment[0] = '\0';
 190         proto[0] = '\0';
 191
 192         if (f == NULL) {        /* bogus pkt */
 193                 if (V_verbose_limit != 0 && V_norule_counter >= V_verbose_limit)
 194                         return;
 195                 V_norule_counter++;
 196                 if (V_norule_counter == V_verbose_limit)
 197                         limit_reached = V_verbose_limit;
 198                 action = "Refuse";
 199         } else {        /* O_LOG is the first action, find the real one */
 200                 ipfw_insn *cmd = ACTION_PTR(f);
 201                 ipfw_insn_log *l = (ipfw_insn_log *)cmd;
 202
 203                 if (l->max_log != 0 && l->log_left == 0)
 204                         return;
 205                 l->log_left--;
 206                 if (l->log_left == 0)
 207                         limit_reached = l->max_log;
 208                 cmd += F_LEN(cmd);      /* point to first action */
 209                 if (cmd->opcode == O_ALTQ) {
 210                         ipfw_insn_altq *altq = (ipfw_insn_altq *)cmd;
 211
 212                         snprintf(SNPARGS(action2, 0), "Altq %d",
 213                                 altq->qid);
 214                         cmd += F_LEN(cmd);
 215                 }
 216                 if (cmd->opcode == O_PROB)
 217                         cmd += F_LEN(cmd);
 218
 219                 if (cmd->opcode == O_TAG)
 220                         cmd += F_LEN(cmd);
 221
 222                 action = action2;
 223                 switch (cmd->opcode) {
 224                 case O_DENY:
 225                         action = "Deny";
 226                         break;
 227
 228                 case O_REJECT:
 229                         if (cmd->arg1==ICMP_REJECT_RST)
 230                                 action = "Reset";
 231                         else if (cmd->arg1==ICMP_UNREACH_HOST)
 232                                 action = "Reject";
 233                         else
 234                                 snprintf(SNPARGS(action2, 0), "Unreach %d",
 235                                         cmd->arg1);
 236                         break;
 237
 238                 case O_UNREACH6:
 239                         if (cmd->arg1==ICMP6_UNREACH_RST)
 240                                 action = "Reset";
 241                         else
 242                                 snprintf(SNPARGS(action2, 0), "Unreach %d",
 243                                         cmd->arg1);
 244                         break;
 245
 246                 case O_ACCEPT:
 247                         action = "Accept";
 248                         break;
 249                 case O_COUNT:
 250                         action = "Count";
 251                         break;
 252                 case O_DIVERT:
 253                         snprintf(SNPARGS(action2, 0), "Divert %d",
 254                                 cmd->arg1);
 255                         break;
 256                 case O_TEE:
 257                         snprintf(SNPARGS(action2, 0), "Tee %d",
 258                                 cmd->arg1);
 259                         break;
 260                 case O_SETFIB:
 261                         snprintf(SNPARGS(action2, 0), "SetFib %d",
 262                                 cmd->arg1);
 263                         break;
 264                 case O_SKIPTO:
 265                         snprintf(SNPARGS(action2, 0), "SkipTo %d",
 266                                 cmd->arg1);
 267                         break;
 268                 case O_PIPE:
 269                         snprintf(SNPARGS(action2, 0), "Pipe %d",
 270                                 cmd->arg1);
 271                         break;
 272                 case O_QUEUE:
 273                         snprintf(SNPARGS(action2, 0), "Queue %d",
 274                                 cmd->arg1);
 275                         break;
 276                 case O_FORWARD_IP: {
 277                         ipfw_insn_sa *sa = (ipfw_insn_sa *)cmd;
 278                         int len;
 279                         struct in_addr dummyaddr;
 280                         if (sa->sa.sin_addr.s_addr == INADDR_ANY)
 281                                 dummyaddr.s_addr = htonl(tablearg);
 282                         else
 283                                 dummyaddr.s_addr = sa->sa.sin_addr.s_addr;
 284
 285                         len = snprintf(SNPARGS(action2, 0), "Forward to %s",
 286                                 inet_ntoa(dummyaddr));
 287
 288                         if (sa->sa.sin_port)
 289                                 snprintf(SNPARGS(action2, len), ":%d",
 290                                     sa->sa.sin_port);
 291                         }
 292                         break;
 293 #ifdef INET6
 294                 case O_FORWARD_IP6: {
 295                         char buf[INET6_ADDRSTRLEN];
 296                         ipfw_insn_sa6 *sa = (ipfw_insn_sa6 *)cmd;
 297                         int len;
 298
 299                         len = snprintf(SNPARGS(action2, 0), "Forward to [%s]",
 300                             ip6_sprintf(buf, &sa->sa.sin6_addr));
 301
 302                         if (sa->sa.sin6_port)
 303                                 snprintf(SNPARGS(action2, len), ":%u",
 304                                     sa->sa.sin6_port);
 305                         }
 306                         break;
 307 #endif
 308                 case O_NETGRAPH:
 309                         snprintf(SNPARGS(action2, 0), "Netgraph %d",
 310                                 cmd->arg1);
 311                         break;
 312                 case O_NGTEE:
 313                         snprintf(SNPARGS(action2, 0), "Ngtee %d",
 314                                 cmd->arg1);
 315                         break;
 316                 case O_NAT:
 317                         action = "Nat";
 318                         break;
 319                 case O_REASS:
 320                         action = "Reass";
 321                         break;
 322                 case O_CALLRETURN:
 323                         if (cmd->len & F_NOT)
 324                                 action = "Return";
 325                         else
 326                                 snprintf(SNPARGS(action2, 0), "Call %d",
 327                                     cmd->arg1);
 328                         break;
 329                 default:
 330                         action = "UNKNOWN";
 331                         break;
 332                 }
 333         }
 334
 335         if (hlen == 0) {        /* non-ip */
 336                 snprintf(SNPARGS(proto, 0), "MAC");
 337
 338         } else {
 339                 int len;
 340 #ifdef INET6
 341                 char src[INET6_ADDRSTRLEN + 2], dst[INET6_ADDRSTRLEN + 2];
 342 #else
 343                 char src[INET_ADDRSTRLEN], dst[INET_ADDRSTRLEN];
 344 #endif
 345                 struct icmphdr *icmp;
 346                 struct tcphdr *tcp;
 347                 struct udphdr *udp;
 348 #ifdef INET6
 349                 struct ip6_hdr *ip6 = NULL;
 350                 struct icmp6_hdr *icmp6;
 351                 u_short ip6f_mf;
 352 #endif
 353                 src[0] = '\0';
 354                 dst[0] = '\0';
 355 #ifdef INET6
 356                 ip6f_mf = offset & IP6F_MORE_FRAG;
 357                 offset &= IP6F_OFF_MASK;
 358
 359                 if (IS_IP6_FLOW_ID(&(args->f_id))) {
 360                         char ip6buf[INET6_ADDRSTRLEN];
 361                         snprintf(src, sizeof(src), "[%s]",
 362                             ip6_sprintf(ip6buf, &args->f_id.src_ip6));
 363                         snprintf(dst, sizeof(dst), "[%s]",
 364                             ip6_sprintf(ip6buf, &args->f_id.dst_ip6));
 365
 366                         ip6 = (struct ip6_hdr *)ip;
 367                         tcp = (struct tcphdr *)(((char *)ip) + hlen);
 368                         udp = (struct udphdr *)(((char *)ip) + hlen);
 369                 } else
 370 #endif
 371                 {
 372                         tcp = L3HDR(struct tcphdr, ip);
 373                         udp = L3HDR(struct udphdr, ip);
 374
 375                         inet_ntoa_r(ip->ip_src, src);
 376                         inet_ntoa_r(ip->ip_dst, dst);
 377                 }
 378
 379                 switch (args->f_id.proto) {
 380                 case IPPROTO_TCP:
 381                         len = snprintf(SNPARGS(proto, 0), "TCP %s", src);
 382                         if (offset == 0)
 383                                 snprintf(SNPARGS(proto, len), ":%d %s:%d",
 384                                     ntohs(tcp->th_sport),
 385                                     dst,
 386                                     ntohs(tcp->th_dport));
 387                         else
 388                                 snprintf(SNPARGS(proto, len), " %s", dst);
 389                         break;
 390
 391                 case IPPROTO_UDP:
 392                         len = snprintf(SNPARGS(proto, 0), "UDP %s", src);
 393                         if (offset == 0)
 394                                 snprintf(SNPARGS(proto, len), ":%d %s:%d",
 395                                     ntohs(udp->uh_sport),
 396                                     dst,
 397                                     ntohs(udp->uh_dport));
 398                         else
 399                                 snprintf(SNPARGS(proto, len), " %s", dst);
 400                         break;
 401
 402                 case IPPROTO_ICMP:
 403                         icmp = L3HDR(struct icmphdr, ip);
 404                         if (offset == 0)
 405                                 len = snprintf(SNPARGS(proto, 0),
 406                                     "ICMP:%u.%u ",
 407                                     icmp->icmp_type, icmp->icmp_code);
 408                         else
 409                                 len = snprintf(SNPARGS(proto, 0), "ICMP ");
 410                         len += snprintf(SNPARGS(proto, len), "%s", src);
 411                         snprintf(SNPARGS(proto, len), " %s", dst);
 412                         break;
 413 #ifdef INET6
 414                 case IPPROTO_ICMPV6:
 415                         icmp6 = (struct icmp6_hdr *)(((char *)ip) + hlen);
 416                         if (offset == 0)
 417                                 len = snprintf(SNPARGS(proto, 0),
 418                                     "ICMPv6:%u.%u ",
 419                                     icmp6->icmp6_type, icmp6->icmp6_code);
 420                         else
 421                                 len = snprintf(SNPARGS(proto, 0), "ICMPv6 ");
 422                         len += snprintf(SNPARGS(proto, len), "%s", src);
 423                         snprintf(SNPARGS(proto, len), " %s", dst);
 424                         break;
 425 #endif
 426                 default:
 427                         len = snprintf(SNPARGS(proto, 0), "P:%d %s",
 428                             args->f_id.proto, src);
 429                         snprintf(SNPARGS(proto, len), " %s", dst);
 430                         break;
 431                 }
 432
 433 #ifdef INET6
 434                 if (IS_IP6_FLOW_ID(&(args->f_id))) {
 435                         if (offset & (IP6F_OFF_MASK | IP6F_MORE_FRAG))
 436                                 snprintf(SNPARGS(fragment, 0),
 437                                     " (frag %08x:%d@%d%s)",
 438                                     args->f_id.extra,
 439                                     ntohs(ip6->ip6_plen) - hlen,
 440                                     ntohs(offset) << 3, ip6f_mf ? "+" : "");
 441                 } else
 442 #endif
 443                 {
 444                         int ipoff, iplen;
 445                         ipoff = ntohs(ip->ip_off);
 446                         iplen = ntohs(ip->ip_len);
 447                         if (ipoff & (IP_MF | IP_OFFMASK))
 448                                 snprintf(SNPARGS(fragment, 0),
 449                                     " (frag %d:%d@%d%s)",
 450                                     ntohs(ip->ip_id), iplen - (ip->ip_hl << 2),
 451                                     offset << 3,
 452                                     (ipoff & IP_MF) ? "+" : "");
 453                 }
 454         }
 455 #ifdef __FreeBSD__
 456         if (oif || m->m_pkthdr.rcvif)
 457                 log(LOG_SECURITY | LOG_INFO,
 458                     "ipfw: %d %s %s %s via %s%s\n",
 459                     f ? f->rulenum : -1,
 460                     action, proto, oif ? "out" : "in",
 461                     oif ? oif->if_xname : m->m_pkthdr.rcvif->if_xname,
 462                     fragment);
 463         else
 464 #endif
 465                 log(LOG_SECURITY | LOG_INFO,
 466                     "ipfw: %d %s %s [no if info]%s\n",
 467                     f ? f->rulenum : -1,
 468                     action, proto, fragment);
 469         if (limit_reached)
 470                 log(LOG_SECURITY | LOG_NOTICE,
 471                     "ipfw: limit %d reached on entry %d\n",
 472                     limit_reached, f ? f->rulenum : -1);
 473 }
 474 /* end of file */