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 <sys/lock.h> 48 #include <sys/rwlock.h> 49 #include <net/ethernet.h> /* for ETHERTYPE_IP */ 50 #include <net/if.h> 51 #include <net/if_var.h> 52 #include <net/if_clone.h> 53 #include <net/vnet.h> 54 #include <net/if_types.h> /* for IFT_PFLOG */ 55 #include <net/bpf.h> /* for BPF */ 56 57 #include <netinet/in.h> 58 #include <netinet/ip.h> 59 #include <netinet/ip_icmp.h> 60 #include <netinet/ip_var.h> 61 #include <netinet/ip_fw.h> 62 #include <netinet/tcp_var.h> 63 #include <netinet/udp.h> 64 65 #include <netinet/ip6.h> 66 #include <netinet/icmp6.h> 67 #ifdef INET6 68 #include <netinet6/in6_var.h> /* ip6_sprintf() */ 69 #endif 70 71 #include <netpfil/ipfw/ip_fw_private.h> 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 static struct rwlock log_if_lock; 99 #define LOGIF_LOCK_INIT(x) rw_init(&log_if_lock, "ipfw log_if lock") 100 #define LOGIF_LOCK_DESTROY(x) rw_destroy(&log_if_lock) 101 #define LOGIF_RLOCK(x) rw_rlock(&log_if_lock) 102 #define LOGIF_RUNLOCK(x) rw_runlock(&log_if_lock) 103 #define LOGIF_WLOCK(x) rw_wlock(&log_if_lock) 104 #define LOGIF_WUNLOCK(x) rw_wunlock(&log_if_lock) 105 106 static const char ipfwname[] = "ipfw"; 107 108 /* we use this dummy function for all ifnet callbacks */ 109 static int 110 log_dummy(struct ifnet *ifp, u_long cmd, caddr_t addr) 111 { 112 return EINVAL; 113 } 114 115 static int 116 ipfw_log_output(struct ifnet *ifp, struct mbuf *m, 117 const struct sockaddr *dst, struct route *ro) 118 { 119 if (m != NULL) 120 FREE_PKT(m); 121 return EINVAL; 122 } 123 124 static void 125 ipfw_log_start(struct ifnet* ifp) 126 { 127 panic("ipfw_log_start() must not be called"); 128 } 129 130 static const u_char ipfwbroadcastaddr[6] = 131 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 132 133 static int 134 ipfw_log_clone_match(struct if_clone *ifc, const char *name) 135 { 136 137 return (strncmp(name, ipfwname, sizeof(ipfwname) - 1) == 0); 138 } 139 140 static int 141 ipfw_log_clone_create(struct if_clone *ifc, char *name, size_t len, 142 caddr_t params) 143 { 144 int error; 145 int unit; 146 struct ifnet *ifp; 147 148 error = ifc_name2unit(name, &unit); 149 if (error) 150 return (error); 151 152 error = ifc_alloc_unit(ifc, &unit); 153 if (error) 154 return (error); 155 156 ifp = if_alloc(IFT_PFLOG); 157 if (ifp == NULL) { 158 ifc_free_unit(ifc, unit); 159 return (ENOSPC); 160 } 161 ifp->if_dname = ipfwname; 162 ifp->if_dunit = unit; 163 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", ipfwname, unit); 164 strlcpy(name, ifp->if_xname, len); 165 ifp->if_mtu = 65536; 166 ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST; 167 ifp->if_init = (void *)log_dummy; 168 ifp->if_ioctl = log_dummy; 169 ifp->if_start = ipfw_log_start; 170 ifp->if_output = ipfw_log_output; 171 ifp->if_addrlen = 6; 172 ifp->if_hdrlen = 14; 173 ifp->if_broadcastaddr = ipfwbroadcastaddr; 174 ifp->if_baudrate = IF_Mbps(10); 175 176 LOGIF_WLOCK(); 177 if (log_if == NULL) 178 log_if = ifp; 179 else { 180 LOGIF_WUNLOCK(); 181 if_free(ifp); 182 ifc_free_unit(ifc, unit); 183 return (EEXIST); 184 } 185 LOGIF_WUNLOCK(); 186 if_attach(ifp); 187 bpfattach(ifp, DLT_EN10MB, 14); 188 189 return (0); 190 } 191 192 static int 193 ipfw_log_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 194 { 195 int unit; 196 197 if (ifp == NULL) 198 return (0); 199 200 LOGIF_WLOCK(); 201 if (log_if != NULL && ifp == log_if) 202 log_if = NULL; 203 else { 204 LOGIF_WUNLOCK(); 205 return (EINVAL); 206 } 207 LOGIF_WUNLOCK(); 208 209 unit = ifp->if_dunit; 210 bpfdetach(ifp); 211 if_detach(ifp); 212 if_free(ifp); 213 ifc_free_unit(ifc, unit); 214 215 return (0); 216 } 217 218 static struct if_clone *ipfw_log_cloner; 219 220 void 221 ipfw_log_bpf(int onoff) 222 { 223 224 if (onoff) { 225 LOGIF_LOCK_INIT(); 226 ipfw_log_cloner = if_clone_advanced(ipfwname, 0, 227 ipfw_log_clone_match, ipfw_log_clone_create, 228 ipfw_log_clone_destroy); 229 } else { 230 if_clone_detach(ipfw_log_cloner); 231 LOGIF_LOCK_DESTROY(); 232 } 233 } 234 #endif /* !WITHOUT_BPF */ 235 236 /* 237 * We enter here when we have a rule with O_LOG. 238 * XXX this function alone takes about 2Kbytes of code! 239 */ 240 void 241 ipfw_log(struct ip_fw *f, u_int hlen, struct ip_fw_args *args, 242 struct mbuf *m, struct ifnet *oif, u_short offset, uint32_t tablearg, 243 struct ip *ip) 244 { 245 char *action; 246 int limit_reached = 0; 247 char action2[92], proto[128], fragment[32]; 248 249 if (V_fw_verbose == 0) { 250 #ifndef WITHOUT_BPF 251 LOGIF_RLOCK(); 252 if (log_if == NULL || log_if->if_bpf == NULL) { 253 LOGIF_RUNLOCK(); 254 return; 255 } 256 257 if (args->eh) /* layer2, use orig hdr */ 258 BPF_MTAP2(log_if, args->eh, ETHER_HDR_LEN, m); 259 else { 260 /* Add fake header. Later we will store 261 * more info in the header. 262 */ 263 if (ip->ip_v == 4) 264 BPF_MTAP2(log_if, "DDDDDDSSSSSS\x08\x00", ETHER_HDR_LEN, m); 265 else if (ip->ip_v == 6) 266 BPF_MTAP2(log_if, "DDDDDDSSSSSS\x86\xdd", ETHER_HDR_LEN, m); 267 else 268 /* Obviously bogus EtherType. */ 269 BPF_MTAP2(log_if, "DDDDDDSSSSSS\xff\xff", ETHER_HDR_LEN, m); 270 } 271 LOGIF_RUNLOCK(); 272 #endif /* !WITHOUT_BPF */ 273 return; 274 } 275 /* the old 'log' function */ 276 fragment[0] = '\0'; 277 proto[0] = '\0'; 278 279 if (f == NULL) { /* bogus pkt */ 280 if (V_verbose_limit != 0 && V_norule_counter >= V_verbose_limit) 281 return; 282 V_norule_counter++; 283 if (V_norule_counter == V_verbose_limit) 284 limit_reached = V_verbose_limit; 285 action = "Refuse"; 286 } else { /* O_LOG is the first action, find the real one */ 287 ipfw_insn *cmd = ACTION_PTR(f); 288 ipfw_insn_log *l = (ipfw_insn_log *)cmd; 289 290 if (l->max_log != 0 && l->log_left == 0) 291 return; 292 l->log_left--; 293 if (l->log_left == 0) 294 limit_reached = l->max_log; 295 cmd += F_LEN(cmd); /* point to first action */ 296 if (cmd->opcode == O_ALTQ) { 297 ipfw_insn_altq *altq = (ipfw_insn_altq *)cmd; 298 299 snprintf(SNPARGS(action2, 0), "Altq %d", 300 altq->qid); 301 cmd += F_LEN(cmd); 302 } 303 if (cmd->opcode == O_PROB || cmd->opcode == O_TAG || 304 cmd->opcode == O_SETDSCP) 305 cmd += F_LEN(cmd); 306 307 action = action2; 308 switch (cmd->opcode) { 309 case O_DENY: 310 action = "Deny"; 311 break; 312 313 case O_REJECT: 314 if (cmd->arg1==ICMP_REJECT_RST) 315 action = "Reset"; 316 else if (cmd->arg1==ICMP_UNREACH_HOST) 317 action = "Reject"; 318 else 319 snprintf(SNPARGS(action2, 0), "Unreach %d", 320 cmd->arg1); 321 break; 322 323 case O_UNREACH6: 324 if (cmd->arg1==ICMP6_UNREACH_RST) 325 action = "Reset"; 326 else 327 snprintf(SNPARGS(action2, 0), "Unreach %d", 328 cmd->arg1); 329 break; 330 331 case O_ACCEPT: 332 action = "Accept"; 333 break; 334 case O_COUNT: 335 action = "Count"; 336 break; 337 case O_DIVERT: 338 snprintf(SNPARGS(action2, 0), "Divert %d", 339 cmd->arg1); 340 break; 341 case O_TEE: 342 snprintf(SNPARGS(action2, 0), "Tee %d", 343 cmd->arg1); 344 break; 345 case O_SETFIB: 346 snprintf(SNPARGS(action2, 0), "SetFib %d", 347 IP_FW_ARG_TABLEARG(cmd->arg1)); 348 break; 349 case O_SKIPTO: 350 snprintf(SNPARGS(action2, 0), "SkipTo %d", 351 IP_FW_ARG_TABLEARG(cmd->arg1)); 352 break; 353 case O_PIPE: 354 snprintf(SNPARGS(action2, 0), "Pipe %d", 355 IP_FW_ARG_TABLEARG(cmd->arg1)); 356 break; 357 case O_QUEUE: 358 snprintf(SNPARGS(action2, 0), "Queue %d", 359 IP_FW_ARG_TABLEARG(cmd->arg1)); 360 break; 361 case O_FORWARD_IP: { 362 ipfw_insn_sa *sa = (ipfw_insn_sa *)cmd; 363 int len; 364 struct in_addr dummyaddr; 365 if (sa->sa.sin_addr.s_addr == INADDR_ANY) 366 dummyaddr.s_addr = htonl(tablearg); 367 else 368 dummyaddr.s_addr = sa->sa.sin_addr.s_addr; 369 370 len = snprintf(SNPARGS(action2, 0), "Forward to %s", 371 inet_ntoa(dummyaddr)); 372 373 if (sa->sa.sin_port) 374 snprintf(SNPARGS(action2, len), ":%d", 375 sa->sa.sin_port); 376 } 377 break; 378 #ifdef INET6 379 case O_FORWARD_IP6: { 380 char buf[INET6_ADDRSTRLEN]; 381 ipfw_insn_sa6 *sa = (ipfw_insn_sa6 *)cmd; 382 int len; 383 384 len = snprintf(SNPARGS(action2, 0), "Forward to [%s]", 385 ip6_sprintf(buf, &sa->sa.sin6_addr)); 386 387 if (sa->sa.sin6_port) 388 snprintf(SNPARGS(action2, len), ":%u", 389 sa->sa.sin6_port); 390 } 391 break; 392 #endif 393 case O_NETGRAPH: 394 snprintf(SNPARGS(action2, 0), "Netgraph %d", 395 cmd->arg1); 396 break; 397 case O_NGTEE: 398 snprintf(SNPARGS(action2, 0), "Ngtee %d", 399 cmd->arg1); 400 break; 401 case O_NAT: 402 action = "Nat"; 403 break; 404 case O_REASS: 405 action = "Reass"; 406 break; 407 case O_CALLRETURN: 408 if (cmd->len & F_NOT) 409 action = "Return"; 410 else 411 snprintf(SNPARGS(action2, 0), "Call %d", 412 cmd->arg1); 413 break; 414 default: 415 action = "UNKNOWN"; 416 break; 417 } 418 } 419 420 if (hlen == 0) { /* non-ip */ 421 snprintf(SNPARGS(proto, 0), "MAC"); 422 423 } else { 424 int len; 425 #ifdef INET6 426 char src[INET6_ADDRSTRLEN + 2], dst[INET6_ADDRSTRLEN + 2]; 427 #else 428 char src[INET_ADDRSTRLEN], dst[INET_ADDRSTRLEN]; 429 #endif 430 struct icmphdr *icmp; 431 struct tcphdr *tcp; 432 struct udphdr *udp; 433 #ifdef INET6 434 struct ip6_hdr *ip6 = NULL; 435 struct icmp6_hdr *icmp6; 436 u_short ip6f_mf; 437 #endif 438 src[0] = '\0'; 439 dst[0] = '\0'; 440 #ifdef INET6 441 ip6f_mf = offset & IP6F_MORE_FRAG; 442 offset &= IP6F_OFF_MASK; 443 444 if (IS_IP6_FLOW_ID(&(args->f_id))) { 445 char ip6buf[INET6_ADDRSTRLEN]; 446 snprintf(src, sizeof(src), "[%s]", 447 ip6_sprintf(ip6buf, &args->f_id.src_ip6)); 448 snprintf(dst, sizeof(dst), "[%s]", 449 ip6_sprintf(ip6buf, &args->f_id.dst_ip6)); 450 451 ip6 = (struct ip6_hdr *)ip; 452 tcp = (struct tcphdr *)(((char *)ip) + hlen); 453 udp = (struct udphdr *)(((char *)ip) + hlen); 454 } else 455 #endif 456 { 457 tcp = L3HDR(struct tcphdr, ip); 458 udp = L3HDR(struct udphdr, ip); 459 460 inet_ntop(AF_INET, &ip->ip_src, src, sizeof(src)); 461 inet_ntop(AF_INET, &ip->ip_dst, dst, sizeof(dst)); 462 } 463 464 switch (args->f_id.proto) { 465 case IPPROTO_TCP: 466 len = snprintf(SNPARGS(proto, 0), "TCP %s", src); 467 if (offset == 0) 468 snprintf(SNPARGS(proto, len), ":%d %s:%d", 469 ntohs(tcp->th_sport), 470 dst, 471 ntohs(tcp->th_dport)); 472 else 473 snprintf(SNPARGS(proto, len), " %s", dst); 474 break; 475 476 case IPPROTO_UDP: 477 len = snprintf(SNPARGS(proto, 0), "UDP %s", src); 478 if (offset == 0) 479 snprintf(SNPARGS(proto, len), ":%d %s:%d", 480 ntohs(udp->uh_sport), 481 dst, 482 ntohs(udp->uh_dport)); 483 else 484 snprintf(SNPARGS(proto, len), " %s", dst); 485 break; 486 487 case IPPROTO_ICMP: 488 icmp = L3HDR(struct icmphdr, ip); 489 if (offset == 0) 490 len = snprintf(SNPARGS(proto, 0), 491 "ICMP:%u.%u ", 492 icmp->icmp_type, icmp->icmp_code); 493 else 494 len = snprintf(SNPARGS(proto, 0), "ICMP "); 495 len += snprintf(SNPARGS(proto, len), "%s", src); 496 snprintf(SNPARGS(proto, len), " %s", dst); 497 break; 498 #ifdef INET6 499 case IPPROTO_ICMPV6: 500 icmp6 = (struct icmp6_hdr *)(((char *)ip) + hlen); 501 if (offset == 0) 502 len = snprintf(SNPARGS(proto, 0), 503 "ICMPv6:%u.%u ", 504 icmp6->icmp6_type, icmp6->icmp6_code); 505 else 506 len = snprintf(SNPARGS(proto, 0), "ICMPv6 "); 507 len += snprintf(SNPARGS(proto, len), "%s", src); 508 snprintf(SNPARGS(proto, len), " %s", dst); 509 break; 510 #endif 511 default: 512 len = snprintf(SNPARGS(proto, 0), "P:%d %s", 513 args->f_id.proto, src); 514 snprintf(SNPARGS(proto, len), " %s", dst); 515 break; 516 } 517 518 #ifdef INET6 519 if (IS_IP6_FLOW_ID(&(args->f_id))) { 520 if (offset & (IP6F_OFF_MASK | IP6F_MORE_FRAG)) 521 snprintf(SNPARGS(fragment, 0), 522 " (frag %08x:%d@%d%s)", 523 args->f_id.extra, 524 ntohs(ip6->ip6_plen) - hlen, 525 ntohs(offset) << 3, ip6f_mf ? "+" : ""); 526 } else 527 #endif 528 { 529 int ipoff, iplen; 530 ipoff = ntohs(ip->ip_off); 531 iplen = ntohs(ip->ip_len); 532 if (ipoff & (IP_MF | IP_OFFMASK)) 533 snprintf(SNPARGS(fragment, 0), 534 " (frag %d:%d@%d%s)", 535 ntohs(ip->ip_id), iplen - (ip->ip_hl << 2), 536 offset << 3, 537 (ipoff & IP_MF) ? "+" : ""); 538 } 539 } 540 #ifdef __FreeBSD__ 541 if (oif || m->m_pkthdr.rcvif) 542 log(LOG_SECURITY | LOG_INFO, 543 "ipfw: %d %s %s %s via %s%s\n", 544 f ? f->rulenum : -1, 545 action, proto, oif ? "out" : "in", 546 oif ? oif->if_xname : m->m_pkthdr.rcvif->if_xname, 547 fragment); 548 else 549 #endif 550 log(LOG_SECURITY | LOG_INFO, 551 "ipfw: %d %s %s [no if info]%s\n", 552 f ? f->rulenum : -1, 553 action, proto, fragment); 554 if (limit_reached) 555 log(LOG_SECURITY | LOG_NOTICE, 556 "ipfw: limit %d reached on entry %d\n", 557 limit_reached, f ? f->rulenum : -1); 558 } 559 /* end of file */ 560