1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2002-2009 Luigi Rizzo, Universita` di Pisa 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 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/kernel.h> 43 #include <sys/mbuf.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/if_var.h> 50 #include <net/if_private.h> 51 #include <net/vnet.h> 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/udp.h> 59 #include <netinet/tcp.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 #ifdef __APPLE__ 85 #undef snprintf 86 #define snprintf sprintf 87 #define SNPARGS(buf, len) buf + len 88 #define SNP(buf) buf 89 #else /* !__APPLE__ */ 90 #define SNPARGS(buf, len) buf + len, sizeof(buf) > len ? sizeof(buf) - len : 0 91 #define SNP(buf) buf, sizeof(buf) 92 #endif /* !__APPLE__ */ 93 94 #define TARG(k, f) IP_FW_ARG_TABLEARG(chain, k, f) 95 /* 96 * We enter here when we have a rule with O_LOG. 97 * XXX this function alone takes about 2Kbytes of code! 98 */ 99 void 100 ipfw_log(struct ip_fw_chain *chain, struct ip_fw *f, u_int hlen, 101 struct ip_fw_args *args, u_short offset, uint32_t tablearg, struct ip *ip) 102 { 103 char *action; 104 int limit_reached = 0; 105 char action2[92], proto[128], fragment[32], mark_str[24]; 106 107 if (V_fw_verbose == 0) { 108 if (args->flags & IPFW_ARGS_LENMASK) 109 ipfw_bpf_tap(args->mem, IPFW_ARGS_LENGTH(args->flags)); 110 else if (args->flags & IPFW_ARGS_ETHER) 111 /* layer2, use orig hdr */ 112 ipfw_bpf_mtap(args->m); 113 else { 114 /* Add fake header. Later we will store 115 * more info in the header. 116 */ 117 if (ip->ip_v == 4) 118 ipfw_bpf_mtap2("DDDDDDSSSSSS\x08\x00", 119 ETHER_HDR_LEN, args->m); 120 else if (ip->ip_v == 6) 121 ipfw_bpf_mtap2("DDDDDDSSSSSS\x86\xdd", 122 ETHER_HDR_LEN, args->m); 123 else 124 /* Obviously bogus EtherType. */ 125 ipfw_bpf_mtap2("DDDDDDSSSSSS\xff\xff", 126 ETHER_HDR_LEN, args->m); 127 } 128 return; 129 } 130 /* the old 'log' function */ 131 fragment[0] = '\0'; 132 proto[0] = '\0'; 133 134 if (f == NULL) { /* bogus pkt */ 135 if (V_verbose_limit != 0 && V_norule_counter >= V_verbose_limit) 136 return; 137 V_norule_counter++; 138 if (V_norule_counter == V_verbose_limit) 139 limit_reached = V_verbose_limit; 140 action = "Refuse"; 141 } else { /* O_LOG is the first action, find the real one */ 142 ipfw_insn *cmd = ACTION_PTR(f); 143 ipfw_insn_log *l = (ipfw_insn_log *)cmd; 144 145 if (l->max_log != 0 && l->log_left == 0) 146 return; 147 l->log_left--; 148 if (l->log_left == 0) 149 limit_reached = l->max_log; 150 cmd += F_LEN(cmd); /* point to first action */ 151 if (cmd->opcode == O_ALTQ) { 152 ipfw_insn_altq *altq = (ipfw_insn_altq *)cmd; 153 154 snprintf(SNPARGS(action2, 0), "Altq %d", 155 altq->qid); 156 cmd += F_LEN(cmd); 157 } 158 if (cmd->opcode == O_PROB || cmd->opcode == O_TAG) 159 cmd += F_LEN(cmd); 160 161 action = action2; 162 switch (cmd->opcode) { 163 case O_DENY: 164 action = "Deny"; 165 break; 166 167 case O_REJECT: 168 if (cmd->arg1==ICMP_REJECT_RST) 169 action = "Reset"; 170 else if (cmd->arg1==ICMP_REJECT_ABORT) 171 action = "Abort"; 172 else if (cmd->arg1==ICMP_UNREACH_HOST) 173 action = "Reject"; 174 else 175 snprintf(SNPARGS(action2, 0), "Unreach %d", 176 cmd->arg1); 177 break; 178 179 case O_UNREACH6: 180 if (cmd->arg1==ICMP6_UNREACH_RST) 181 action = "Reset"; 182 else if (cmd->arg1==ICMP6_UNREACH_ABORT) 183 action = "Abort"; 184 else 185 snprintf(SNPARGS(action2, 0), "Unreach %d", 186 cmd->arg1); 187 break; 188 189 case O_ACCEPT: 190 action = "Accept"; 191 break; 192 case O_COUNT: 193 action = "Count"; 194 break; 195 case O_DIVERT: 196 snprintf(SNPARGS(action2, 0), "Divert %d", 197 TARG(cmd->arg1, divert)); 198 break; 199 case O_TEE: 200 snprintf(SNPARGS(action2, 0), "Tee %d", 201 TARG(cmd->arg1, divert)); 202 break; 203 case O_SETDSCP: 204 snprintf(SNPARGS(action2, 0), "SetDscp %d", 205 TARG(cmd->arg1, dscp) & 0x3F); 206 break; 207 case O_SETFIB: 208 snprintf(SNPARGS(action2, 0), "SetFib %d", 209 TARG(cmd->arg1, fib) & 0x7FFF); 210 break; 211 case O_SKIPTO: 212 snprintf(SNPARGS(action2, 0), "SkipTo %d", 213 TARG(cmd->arg1, skipto)); 214 break; 215 case O_PIPE: 216 snprintf(SNPARGS(action2, 0), "Pipe %d", 217 TARG(cmd->arg1, pipe)); 218 break; 219 case O_QUEUE: 220 snprintf(SNPARGS(action2, 0), "Queue %d", 221 TARG(cmd->arg1, pipe)); 222 break; 223 case O_FORWARD_IP: { 224 char buf[INET_ADDRSTRLEN]; 225 ipfw_insn_sa *sa = (ipfw_insn_sa *)cmd; 226 int len; 227 struct in_addr dummyaddr; 228 if (sa->sa.sin_addr.s_addr == INADDR_ANY) 229 dummyaddr.s_addr = htonl(tablearg); 230 else 231 dummyaddr.s_addr = sa->sa.sin_addr.s_addr; 232 233 len = snprintf(SNPARGS(action2, 0), "Forward to %s", 234 inet_ntoa_r(dummyaddr, buf)); 235 236 if (sa->sa.sin_port) 237 snprintf(SNPARGS(action2, len), ":%d", 238 sa->sa.sin_port); 239 } 240 break; 241 #ifdef INET6 242 case O_FORWARD_IP6: { 243 char buf[INET6_ADDRSTRLEN]; 244 ipfw_insn_sa6 *sa = (ipfw_insn_sa6 *)cmd; 245 int len; 246 247 len = snprintf(SNPARGS(action2, 0), "Forward to [%s]", 248 ip6_sprintf(buf, &sa->sa.sin6_addr)); 249 250 if (sa->sa.sin6_port) 251 snprintf(SNPARGS(action2, len), ":%u", 252 sa->sa.sin6_port); 253 } 254 break; 255 #endif 256 case O_NETGRAPH: 257 snprintf(SNPARGS(action2, 0), "Netgraph %d", 258 cmd->arg1); 259 break; 260 case O_NGTEE: 261 snprintf(SNPARGS(action2, 0), "Ngtee %d", 262 cmd->arg1); 263 break; 264 case O_NAT: 265 action = "Nat"; 266 break; 267 case O_REASS: 268 action = "Reass"; 269 break; 270 case O_CALLRETURN: 271 if (cmd->len & F_NOT) 272 action = "Return"; 273 else 274 snprintf(SNPARGS(action2, 0), "Call %d", 275 cmd->arg1); 276 break; 277 case O_SETMARK: 278 if (cmd->arg1 == IP_FW_TARG) 279 snprintf(SNPARGS(action2, 0), "SetMark %#x", 280 TARG(cmd->arg1, mark)); 281 else 282 snprintf(SNPARGS(action2, 0), "SetMark %#x", 283 ((ipfw_insn_u32 *)cmd)->d[0]); 284 break; 285 case O_EXTERNAL_ACTION: 286 snprintf(SNPARGS(action2, 0), "Eaction %s", 287 ((struct named_object *)SRV_OBJECT(chain, 288 cmd->arg1))->name); 289 break; 290 default: 291 action = "UNKNOWN"; 292 break; 293 } 294 } 295 296 if (hlen == 0) { /* non-ip */ 297 snprintf(SNPARGS(proto, 0), "MAC"); 298 299 } else { 300 int len; 301 #ifdef INET6 302 char src[INET6_ADDRSTRLEN + 2], dst[INET6_ADDRSTRLEN + 2]; 303 #else 304 char src[INET_ADDRSTRLEN], dst[INET_ADDRSTRLEN]; 305 #endif 306 struct icmphdr *icmp; 307 struct tcphdr *tcp; 308 struct udphdr *udp; 309 #ifdef INET6 310 struct ip6_hdr *ip6 = NULL; 311 struct icmp6_hdr *icmp6; 312 u_short ip6f_mf; 313 #endif 314 src[0] = '\0'; 315 dst[0] = '\0'; 316 #ifdef INET6 317 ip6f_mf = offset & IP6F_MORE_FRAG; 318 offset &= IP6F_OFF_MASK; 319 320 if (IS_IP6_FLOW_ID(&(args->f_id))) { 321 char ip6buf[INET6_ADDRSTRLEN]; 322 snprintf(src, sizeof(src), "[%s]", 323 ip6_sprintf(ip6buf, &args->f_id.src_ip6)); 324 snprintf(dst, sizeof(dst), "[%s]", 325 ip6_sprintf(ip6buf, &args->f_id.dst_ip6)); 326 327 ip6 = (struct ip6_hdr *)ip; 328 tcp = (struct tcphdr *)(((char *)ip) + hlen); 329 udp = (struct udphdr *)(((char *)ip) + hlen); 330 } else 331 #endif 332 { 333 tcp = L3HDR(struct tcphdr, ip); 334 udp = L3HDR(struct udphdr, ip); 335 336 inet_ntop(AF_INET, &ip->ip_src, src, sizeof(src)); 337 inet_ntop(AF_INET, &ip->ip_dst, dst, sizeof(dst)); 338 } 339 340 switch (args->f_id.proto) { 341 case IPPROTO_TCP: 342 len = snprintf(SNPARGS(proto, 0), "TCP %s", src); 343 if (offset == 0) 344 snprintf(SNPARGS(proto, len), ":%d %s:%d", 345 ntohs(tcp->th_sport), 346 dst, 347 ntohs(tcp->th_dport)); 348 else 349 snprintf(SNPARGS(proto, len), " %s", dst); 350 break; 351 352 case IPPROTO_UDP: 353 case IPPROTO_UDPLITE: 354 len = snprintf(SNPARGS(proto, 0), "UDP%s%s", 355 args->f_id.proto == IPPROTO_UDP ? " ": "Lite ", 356 src); 357 if (offset == 0) 358 snprintf(SNPARGS(proto, len), ":%d %s:%d", 359 ntohs(udp->uh_sport), 360 dst, 361 ntohs(udp->uh_dport)); 362 else 363 snprintf(SNPARGS(proto, len), " %s", dst); 364 break; 365 366 case IPPROTO_ICMP: 367 icmp = L3HDR(struct icmphdr, ip); 368 if (offset == 0) 369 len = snprintf(SNPARGS(proto, 0), 370 "ICMP:%u.%u ", 371 icmp->icmp_type, icmp->icmp_code); 372 else 373 len = snprintf(SNPARGS(proto, 0), "ICMP "); 374 len += snprintf(SNPARGS(proto, len), "%s", src); 375 snprintf(SNPARGS(proto, len), " %s", dst); 376 break; 377 #ifdef INET6 378 case IPPROTO_ICMPV6: 379 icmp6 = (struct icmp6_hdr *)(((char *)ip) + hlen); 380 if (offset == 0) 381 len = snprintf(SNPARGS(proto, 0), 382 "ICMPv6:%u.%u ", 383 icmp6->icmp6_type, icmp6->icmp6_code); 384 else 385 len = snprintf(SNPARGS(proto, 0), "ICMPv6 "); 386 len += snprintf(SNPARGS(proto, len), "%s", src); 387 snprintf(SNPARGS(proto, len), " %s", dst); 388 break; 389 #endif 390 default: 391 len = snprintf(SNPARGS(proto, 0), "P:%d %s", 392 args->f_id.proto, src); 393 snprintf(SNPARGS(proto, len), " %s", dst); 394 break; 395 } 396 397 #ifdef INET6 398 if (IS_IP6_FLOW_ID(&(args->f_id))) { 399 if (offset || ip6f_mf) 400 snprintf(SNPARGS(fragment, 0), 401 " (frag %08x:%d@%d%s)", 402 args->f_id.extra, 403 ntohs(ip6->ip6_plen) - hlen, 404 ntohs(offset) << 3, ip6f_mf ? "+" : ""); 405 } else 406 #endif 407 { 408 int ipoff, iplen; 409 ipoff = ntohs(ip->ip_off); 410 iplen = ntohs(ip->ip_len); 411 if (ipoff & (IP_MF | IP_OFFMASK)) 412 snprintf(SNPARGS(fragment, 0), 413 " (frag %d:%d@%d%s)", 414 ntohs(ip->ip_id), iplen - (ip->ip_hl << 2), 415 offset << 3, 416 (ipoff & IP_MF) ? "+" : ""); 417 } 418 } 419 420 /* [fw]mark */ 421 if (args->rule.pkt_mark) 422 snprintf(SNPARGS(mark_str, 0), " mark:%#x", 423 args->rule.pkt_mark); 424 else 425 mark_str[0] = '\0'; 426 427 #ifdef __FreeBSD__ 428 log(LOG_SECURITY | LOG_INFO, "ipfw: %d %s %s%s %s via %s%s\n", 429 f ? f->rulenum : -1, action, proto, mark_str, 430 args->flags & IPFW_ARGS_OUT ? "out" : "in", args->ifp->if_xname, 431 fragment); 432 #else 433 log(LOG_SECURITY | LOG_INFO, "ipfw: %d %s %s%s [no if info]%s\n", 434 f ? f->rulenum : -1, action, proto, mark_str, fragment); 435 #endif 436 if (limit_reached) 437 log(LOG_SECURITY | LOG_NOTICE, 438 "ipfw: limit %d reached on entry %d\n", 439 limit_reached, f ? f->rulenum : -1); 440 } 441 /* end of file */ 442