1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 __FBSDID("$FreeBSD$"); 30 31 /* 32 * Logging support for ipfw 33 */ 34 35 #include "opt_ipfw.h" 36 #include "opt_inet.h" 37 #ifndef INET 38 #error IPFIREWALL requires INET. 39 #endif /* INET */ 40 #include "opt_inet6.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/mbuf.h> 46 #include <sys/socket.h> 47 #include <sys/sysctl.h> 48 #include <sys/syslog.h> 49 #include <net/ethernet.h> /* for ETHERTYPE_IP */ 50 #include <net/if.h> 51 #include <net/if_var.h> 52 #include <net/vnet.h> 53 54 #include <netinet/in.h> 55 #include <netinet/ip.h> 56 #include <netinet/ip_icmp.h> 57 #include <netinet/ip_var.h> 58 #include <netinet/ip_fw.h> 59 #include <netinet/tcp_var.h> 60 #include <netinet/udp.h> 61 62 #include <netinet/ip6.h> 63 #include <netinet/icmp6.h> 64 #ifdef INET6 65 #include <netinet6/in6_var.h> /* ip6_sprintf() */ 66 #endif 67 68 #include <netpfil/ipfw/ip_fw_private.h> 69 70 #ifdef MAC 71 #include <security/mac/mac_framework.h> 72 #endif 73 74 /* 75 * L3HDR maps an ipv4 pointer into a layer3 header pointer of type T 76 * Other macros just cast void * into the appropriate type 77 */ 78 #define L3HDR(T, ip) ((T *)((u_int32_t *)(ip) + (ip)->ip_hl)) 79 #define TCP(p) ((struct tcphdr *)(p)) 80 #define SCTP(p) ((struct sctphdr *)(p)) 81 #define UDP(p) ((struct udphdr *)(p)) 82 #define ICMP(p) ((struct icmphdr *)(p)) 83 #define ICMP6(p) ((struct icmp6_hdr *)(p)) 84 85 #ifdef __APPLE__ 86 #undef snprintf 87 #define snprintf sprintf 88 #define SNPARGS(buf, len) buf + len 89 #define SNP(buf) buf 90 #else /* !__APPLE__ */ 91 #define SNPARGS(buf, len) buf + len, sizeof(buf) > len ? sizeof(buf) - len : 0 92 #define SNP(buf) buf, sizeof(buf) 93 #endif /* !__APPLE__ */ 94 95 #define TARG(k, f) IP_FW_ARG_TABLEARG(chain, k, f) 96 /* 97 * We enter here when we have a rule with O_LOG. 98 * XXX this function alone takes about 2Kbytes of code! 99 */ 100 void 101 ipfw_log(struct ip_fw_chain *chain, struct ip_fw *f, u_int hlen, 102 struct ip_fw_args *args, u_short offset, uint32_t tablearg, struct ip *ip) 103 { 104 char *action; 105 int limit_reached = 0; 106 char action2[92], proto[128], fragment[32]; 107 108 if (V_fw_verbose == 0) { 109 if (args->flags & IPFW_ARGS_LENMASK) 110 ipfw_bpf_tap(args->mem, IPFW_ARGS_LENGTH(args->flags)); 111 else if (args->flags & IPFW_ARGS_ETHER) 112 /* layer2, use orig hdr */ 113 ipfw_bpf_mtap(args->m); 114 else { 115 /* Add fake header. Later we will store 116 * more info in the header. 117 */ 118 if (ip->ip_v == 4) 119 ipfw_bpf_mtap2("DDDDDDSSSSSS\x08\x00", 120 ETHER_HDR_LEN, args->m); 121 else if (ip->ip_v == 6) 122 ipfw_bpf_mtap2("DDDDDDSSSSSS\x86\xdd", 123 ETHER_HDR_LEN, args->m); 124 else 125 /* Obviously bogus EtherType. */ 126 ipfw_bpf_mtap2("DDDDDDSSSSSS\xff\xff", 127 ETHER_HDR_LEN, args->m); 128 } 129 return; 130 } 131 /* the old 'log' function */ 132 fragment[0] = '\0'; 133 proto[0] = '\0'; 134 135 if (f == NULL) { /* bogus pkt */ 136 if (V_verbose_limit != 0 && V_norule_counter >= V_verbose_limit) 137 return; 138 V_norule_counter++; 139 if (V_norule_counter == V_verbose_limit) 140 limit_reached = V_verbose_limit; 141 action = "Refuse"; 142 } else { /* O_LOG is the first action, find the real one */ 143 ipfw_insn *cmd = ACTION_PTR(f); 144 ipfw_insn_log *l = (ipfw_insn_log *)cmd; 145 146 if (l->max_log != 0 && l->log_left == 0) 147 return; 148 l->log_left--; 149 if (l->log_left == 0) 150 limit_reached = l->max_log; 151 cmd += F_LEN(cmd); /* point to first action */ 152 if (cmd->opcode == O_ALTQ) { 153 ipfw_insn_altq *altq = (ipfw_insn_altq *)cmd; 154 155 snprintf(SNPARGS(action2, 0), "Altq %d", 156 altq->qid); 157 cmd += F_LEN(cmd); 158 } 159 if (cmd->opcode == O_PROB || cmd->opcode == O_TAG || 160 cmd->opcode == O_SETDSCP) 161 cmd += F_LEN(cmd); 162 163 action = action2; 164 switch (cmd->opcode) { 165 case O_DENY: 166 action = "Deny"; 167 break; 168 169 case O_REJECT: 170 if (cmd->arg1==ICMP_REJECT_RST) 171 action = "Reset"; 172 else if (cmd->arg1==ICMP_REJECT_ABORT) 173 action = "Abort"; 174 else if (cmd->arg1==ICMP_UNREACH_HOST) 175 action = "Reject"; 176 else 177 snprintf(SNPARGS(action2, 0), "Unreach %d", 178 cmd->arg1); 179 break; 180 181 case O_UNREACH6: 182 if (cmd->arg1==ICMP6_UNREACH_RST) 183 action = "Reset"; 184 else if (cmd->arg1==ICMP6_UNREACH_ABORT) 185 action = "Abort"; 186 else 187 snprintf(SNPARGS(action2, 0), "Unreach %d", 188 cmd->arg1); 189 break; 190 191 case O_ACCEPT: 192 action = "Accept"; 193 break; 194 case O_COUNT: 195 action = "Count"; 196 break; 197 case O_DIVERT: 198 snprintf(SNPARGS(action2, 0), "Divert %d", 199 TARG(cmd->arg1, divert)); 200 break; 201 case O_TEE: 202 snprintf(SNPARGS(action2, 0), "Tee %d", 203 TARG(cmd->arg1, divert)); 204 break; 205 case O_SETFIB: 206 snprintf(SNPARGS(action2, 0), "SetFib %d", 207 TARG(cmd->arg1, fib) & 0x7FFF); 208 break; 209 case O_SKIPTO: 210 snprintf(SNPARGS(action2, 0), "SkipTo %d", 211 TARG(cmd->arg1, skipto)); 212 break; 213 case O_PIPE: 214 snprintf(SNPARGS(action2, 0), "Pipe %d", 215 TARG(cmd->arg1, pipe)); 216 break; 217 case O_QUEUE: 218 snprintf(SNPARGS(action2, 0), "Queue %d", 219 TARG(cmd->arg1, pipe)); 220 break; 221 case O_FORWARD_IP: { 222 char buf[INET_ADDRSTRLEN]; 223 ipfw_insn_sa *sa = (ipfw_insn_sa *)cmd; 224 int len; 225 struct in_addr dummyaddr; 226 if (sa->sa.sin_addr.s_addr == INADDR_ANY) 227 dummyaddr.s_addr = htonl(tablearg); 228 else 229 dummyaddr.s_addr = sa->sa.sin_addr.s_addr; 230 231 len = snprintf(SNPARGS(action2, 0), "Forward to %s", 232 inet_ntoa_r(dummyaddr, buf)); 233 234 if (sa->sa.sin_port) 235 snprintf(SNPARGS(action2, len), ":%d", 236 sa->sa.sin_port); 237 } 238 break; 239 #ifdef INET6 240 case O_FORWARD_IP6: { 241 char buf[INET6_ADDRSTRLEN]; 242 ipfw_insn_sa6 *sa = (ipfw_insn_sa6 *)cmd; 243 int len; 244 245 len = snprintf(SNPARGS(action2, 0), "Forward to [%s]", 246 ip6_sprintf(buf, &sa->sa.sin6_addr)); 247 248 if (sa->sa.sin6_port) 249 snprintf(SNPARGS(action2, len), ":%u", 250 sa->sa.sin6_port); 251 } 252 break; 253 #endif 254 case O_NETGRAPH: 255 snprintf(SNPARGS(action2, 0), "Netgraph %d", 256 cmd->arg1); 257 break; 258 case O_NGTEE: 259 snprintf(SNPARGS(action2, 0), "Ngtee %d", 260 cmd->arg1); 261 break; 262 case O_NAT: 263 action = "Nat"; 264 break; 265 case O_REASS: 266 action = "Reass"; 267 break; 268 case O_CALLRETURN: 269 if (cmd->len & F_NOT) 270 action = "Return"; 271 else 272 snprintf(SNPARGS(action2, 0), "Call %d", 273 cmd->arg1); 274 break; 275 case O_EXTERNAL_ACTION: 276 snprintf(SNPARGS(action2, 0), "Eaction %s", 277 ((struct named_object *)SRV_OBJECT(chain, 278 cmd->arg1))->name); 279 break; 280 default: 281 action = "UNKNOWN"; 282 break; 283 } 284 } 285 286 if (hlen == 0) { /* non-ip */ 287 snprintf(SNPARGS(proto, 0), "MAC"); 288 289 } else { 290 int len; 291 #ifdef INET6 292 char src[INET6_ADDRSTRLEN + 2], dst[INET6_ADDRSTRLEN + 2]; 293 #else 294 char src[INET_ADDRSTRLEN], dst[INET_ADDRSTRLEN]; 295 #endif 296 struct icmphdr *icmp; 297 struct tcphdr *tcp; 298 struct udphdr *udp; 299 #ifdef INET6 300 struct ip6_hdr *ip6 = NULL; 301 struct icmp6_hdr *icmp6; 302 u_short ip6f_mf; 303 #endif 304 src[0] = '\0'; 305 dst[0] = '\0'; 306 #ifdef INET6 307 ip6f_mf = offset & IP6F_MORE_FRAG; 308 offset &= IP6F_OFF_MASK; 309 310 if (IS_IP6_FLOW_ID(&(args->f_id))) { 311 char ip6buf[INET6_ADDRSTRLEN]; 312 snprintf(src, sizeof(src), "[%s]", 313 ip6_sprintf(ip6buf, &args->f_id.src_ip6)); 314 snprintf(dst, sizeof(dst), "[%s]", 315 ip6_sprintf(ip6buf, &args->f_id.dst_ip6)); 316 317 ip6 = (struct ip6_hdr *)ip; 318 tcp = (struct tcphdr *)(((char *)ip) + hlen); 319 udp = (struct udphdr *)(((char *)ip) + hlen); 320 } else 321 #endif 322 { 323 tcp = L3HDR(struct tcphdr, ip); 324 udp = L3HDR(struct udphdr, ip); 325 326 inet_ntop(AF_INET, &ip->ip_src, src, sizeof(src)); 327 inet_ntop(AF_INET, &ip->ip_dst, dst, sizeof(dst)); 328 } 329 330 switch (args->f_id.proto) { 331 case IPPROTO_TCP: 332 len = snprintf(SNPARGS(proto, 0), "TCP %s", src); 333 if (offset == 0) 334 snprintf(SNPARGS(proto, len), ":%d %s:%d", 335 ntohs(tcp->th_sport), 336 dst, 337 ntohs(tcp->th_dport)); 338 else 339 snprintf(SNPARGS(proto, len), " %s", dst); 340 break; 341 342 case IPPROTO_UDP: 343 case IPPROTO_UDPLITE: 344 len = snprintf(SNPARGS(proto, 0), "UDP%s%s", 345 args->f_id.proto == IPPROTO_UDP ? " ": "Lite ", 346 src); 347 if (offset == 0) 348 snprintf(SNPARGS(proto, len), ":%d %s:%d", 349 ntohs(udp->uh_sport), 350 dst, 351 ntohs(udp->uh_dport)); 352 else 353 snprintf(SNPARGS(proto, len), " %s", dst); 354 break; 355 356 case IPPROTO_ICMP: 357 icmp = L3HDR(struct icmphdr, ip); 358 if (offset == 0) 359 len = snprintf(SNPARGS(proto, 0), 360 "ICMP:%u.%u ", 361 icmp->icmp_type, icmp->icmp_code); 362 else 363 len = snprintf(SNPARGS(proto, 0), "ICMP "); 364 len += snprintf(SNPARGS(proto, len), "%s", src); 365 snprintf(SNPARGS(proto, len), " %s", dst); 366 break; 367 #ifdef INET6 368 case IPPROTO_ICMPV6: 369 icmp6 = (struct icmp6_hdr *)(((char *)ip) + hlen); 370 if (offset == 0) 371 len = snprintf(SNPARGS(proto, 0), 372 "ICMPv6:%u.%u ", 373 icmp6->icmp6_type, icmp6->icmp6_code); 374 else 375 len = snprintf(SNPARGS(proto, 0), "ICMPv6 "); 376 len += snprintf(SNPARGS(proto, len), "%s", src); 377 snprintf(SNPARGS(proto, len), " %s", dst); 378 break; 379 #endif 380 default: 381 len = snprintf(SNPARGS(proto, 0), "P:%d %s", 382 args->f_id.proto, src); 383 snprintf(SNPARGS(proto, len), " %s", dst); 384 break; 385 } 386 387 #ifdef INET6 388 if (IS_IP6_FLOW_ID(&(args->f_id))) { 389 if (offset || ip6f_mf) 390 snprintf(SNPARGS(fragment, 0), 391 " (frag %08x:%d@%d%s)", 392 args->f_id.extra, 393 ntohs(ip6->ip6_plen) - hlen, 394 ntohs(offset) << 3, ip6f_mf ? "+" : ""); 395 } else 396 #endif 397 { 398 int ipoff, iplen; 399 ipoff = ntohs(ip->ip_off); 400 iplen = ntohs(ip->ip_len); 401 if (ipoff & (IP_MF | IP_OFFMASK)) 402 snprintf(SNPARGS(fragment, 0), 403 " (frag %d:%d@%d%s)", 404 ntohs(ip->ip_id), iplen - (ip->ip_hl << 2), 405 offset << 3, 406 (ipoff & IP_MF) ? "+" : ""); 407 } 408 } 409 #ifdef __FreeBSD__ 410 log(LOG_SECURITY | LOG_INFO, "ipfw: %d %s %s %s via %s%s\n", 411 f ? f->rulenum : -1, action, proto, 412 args->flags & IPFW_ARGS_OUT ? "out" : "in", args->ifp->if_xname, 413 fragment); 414 #else 415 log(LOG_SECURITY | LOG_INFO, "ipfw: %d %s %s [no if info]%s\n", 416 f ? f->rulenum : -1, action, proto, fragment); 417 #endif 418 if (limit_reached) 419 log(LOG_SECURITY | LOG_NOTICE, 420 "ipfw: limit %d reached on entry %d\n", 421 limit_reached, f ? f->rulenum : -1); 422 } 423 /* end of file */ 424