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/udp.h> 60 #include <netinet/tcp.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 += F_LEN(cmd); 161 162 action = action2; 163 switch (cmd->opcode) { 164 case O_DENY: 165 action = "Deny"; 166 break; 167 168 case O_REJECT: 169 if (cmd->arg1==ICMP_REJECT_RST) 170 action = "Reset"; 171 else if (cmd->arg1==ICMP_REJECT_ABORT) 172 action = "Abort"; 173 else if (cmd->arg1==ICMP_UNREACH_HOST) 174 action = "Reject"; 175 else 176 snprintf(SNPARGS(action2, 0), "Unreach %d", 177 cmd->arg1); 178 break; 179 180 case O_UNREACH6: 181 if (cmd->arg1==ICMP6_UNREACH_RST) 182 action = "Reset"; 183 else if (cmd->arg1==ICMP6_UNREACH_ABORT) 184 action = "Abort"; 185 else 186 snprintf(SNPARGS(action2, 0), "Unreach %d", 187 cmd->arg1); 188 break; 189 190 case O_ACCEPT: 191 action = "Accept"; 192 break; 193 case O_COUNT: 194 action = "Count"; 195 break; 196 case O_DIVERT: 197 snprintf(SNPARGS(action2, 0), "Divert %d", 198 TARG(cmd->arg1, divert)); 199 break; 200 case O_TEE: 201 snprintf(SNPARGS(action2, 0), "Tee %d", 202 TARG(cmd->arg1, divert)); 203 break; 204 case O_SETDSCP: 205 snprintf(SNPARGS(action2, 0), "SetDscp %d", 206 TARG(cmd->arg1, dscp) & 0x3F); 207 break; 208 case O_SETFIB: 209 snprintf(SNPARGS(action2, 0), "SetFib %d", 210 TARG(cmd->arg1, fib) & 0x7FFF); 211 break; 212 case O_SKIPTO: 213 snprintf(SNPARGS(action2, 0), "SkipTo %d", 214 TARG(cmd->arg1, skipto)); 215 break; 216 case O_PIPE: 217 snprintf(SNPARGS(action2, 0), "Pipe %d", 218 TARG(cmd->arg1, pipe)); 219 break; 220 case O_QUEUE: 221 snprintf(SNPARGS(action2, 0), "Queue %d", 222 TARG(cmd->arg1, pipe)); 223 break; 224 case O_FORWARD_IP: { 225 char buf[INET_ADDRSTRLEN]; 226 ipfw_insn_sa *sa = (ipfw_insn_sa *)cmd; 227 int len; 228 struct in_addr dummyaddr; 229 if (sa->sa.sin_addr.s_addr == INADDR_ANY) 230 dummyaddr.s_addr = htonl(tablearg); 231 else 232 dummyaddr.s_addr = sa->sa.sin_addr.s_addr; 233 234 len = snprintf(SNPARGS(action2, 0), "Forward to %s", 235 inet_ntoa_r(dummyaddr, buf)); 236 237 if (sa->sa.sin_port) 238 snprintf(SNPARGS(action2, len), ":%d", 239 sa->sa.sin_port); 240 } 241 break; 242 #ifdef INET6 243 case O_FORWARD_IP6: { 244 char buf[INET6_ADDRSTRLEN]; 245 ipfw_insn_sa6 *sa = (ipfw_insn_sa6 *)cmd; 246 int len; 247 248 len = snprintf(SNPARGS(action2, 0), "Forward to [%s]", 249 ip6_sprintf(buf, &sa->sa.sin6_addr)); 250 251 if (sa->sa.sin6_port) 252 snprintf(SNPARGS(action2, len), ":%u", 253 sa->sa.sin6_port); 254 } 255 break; 256 #endif 257 case O_NETGRAPH: 258 snprintf(SNPARGS(action2, 0), "Netgraph %d", 259 cmd->arg1); 260 break; 261 case O_NGTEE: 262 snprintf(SNPARGS(action2, 0), "Ngtee %d", 263 cmd->arg1); 264 break; 265 case O_NAT: 266 action = "Nat"; 267 break; 268 case O_REASS: 269 action = "Reass"; 270 break; 271 case O_CALLRETURN: 272 if (cmd->len & F_NOT) 273 action = "Return"; 274 else 275 snprintf(SNPARGS(action2, 0), "Call %d", 276 cmd->arg1); 277 break; 278 case O_EXTERNAL_ACTION: 279 snprintf(SNPARGS(action2, 0), "Eaction %s", 280 ((struct named_object *)SRV_OBJECT(chain, 281 cmd->arg1))->name); 282 break; 283 default: 284 action = "UNKNOWN"; 285 break; 286 } 287 } 288 289 if (hlen == 0) { /* non-ip */ 290 snprintf(SNPARGS(proto, 0), "MAC"); 291 292 } else { 293 int len; 294 #ifdef INET6 295 char src[INET6_ADDRSTRLEN + 2], dst[INET6_ADDRSTRLEN + 2]; 296 #else 297 char src[INET_ADDRSTRLEN], dst[INET_ADDRSTRLEN]; 298 #endif 299 struct icmphdr *icmp; 300 struct tcphdr *tcp; 301 struct udphdr *udp; 302 #ifdef INET6 303 struct ip6_hdr *ip6 = NULL; 304 struct icmp6_hdr *icmp6; 305 u_short ip6f_mf; 306 #endif 307 src[0] = '\0'; 308 dst[0] = '\0'; 309 #ifdef INET6 310 ip6f_mf = offset & IP6F_MORE_FRAG; 311 offset &= IP6F_OFF_MASK; 312 313 if (IS_IP6_FLOW_ID(&(args->f_id))) { 314 char ip6buf[INET6_ADDRSTRLEN]; 315 snprintf(src, sizeof(src), "[%s]", 316 ip6_sprintf(ip6buf, &args->f_id.src_ip6)); 317 snprintf(dst, sizeof(dst), "[%s]", 318 ip6_sprintf(ip6buf, &args->f_id.dst_ip6)); 319 320 ip6 = (struct ip6_hdr *)ip; 321 tcp = (struct tcphdr *)(((char *)ip) + hlen); 322 udp = (struct udphdr *)(((char *)ip) + hlen); 323 } else 324 #endif 325 { 326 tcp = L3HDR(struct tcphdr, ip); 327 udp = L3HDR(struct udphdr, ip); 328 329 inet_ntop(AF_INET, &ip->ip_src, src, sizeof(src)); 330 inet_ntop(AF_INET, &ip->ip_dst, dst, sizeof(dst)); 331 } 332 333 switch (args->f_id.proto) { 334 case IPPROTO_TCP: 335 len = snprintf(SNPARGS(proto, 0), "TCP %s", src); 336 if (offset == 0) 337 snprintf(SNPARGS(proto, len), ":%d %s:%d", 338 ntohs(tcp->th_sport), 339 dst, 340 ntohs(tcp->th_dport)); 341 else 342 snprintf(SNPARGS(proto, len), " %s", dst); 343 break; 344 345 case IPPROTO_UDP: 346 case IPPROTO_UDPLITE: 347 len = snprintf(SNPARGS(proto, 0), "UDP%s%s", 348 args->f_id.proto == IPPROTO_UDP ? " ": "Lite ", 349 src); 350 if (offset == 0) 351 snprintf(SNPARGS(proto, len), ":%d %s:%d", 352 ntohs(udp->uh_sport), 353 dst, 354 ntohs(udp->uh_dport)); 355 else 356 snprintf(SNPARGS(proto, len), " %s", dst); 357 break; 358 359 case IPPROTO_ICMP: 360 icmp = L3HDR(struct icmphdr, ip); 361 if (offset == 0) 362 len = snprintf(SNPARGS(proto, 0), 363 "ICMP:%u.%u ", 364 icmp->icmp_type, icmp->icmp_code); 365 else 366 len = snprintf(SNPARGS(proto, 0), "ICMP "); 367 len += snprintf(SNPARGS(proto, len), "%s", src); 368 snprintf(SNPARGS(proto, len), " %s", dst); 369 break; 370 #ifdef INET6 371 case IPPROTO_ICMPV6: 372 icmp6 = (struct icmp6_hdr *)(((char *)ip) + hlen); 373 if (offset == 0) 374 len = snprintf(SNPARGS(proto, 0), 375 "ICMPv6:%u.%u ", 376 icmp6->icmp6_type, icmp6->icmp6_code); 377 else 378 len = snprintf(SNPARGS(proto, 0), "ICMPv6 "); 379 len += snprintf(SNPARGS(proto, len), "%s", src); 380 snprintf(SNPARGS(proto, len), " %s", dst); 381 break; 382 #endif 383 default: 384 len = snprintf(SNPARGS(proto, 0), "P:%d %s", 385 args->f_id.proto, src); 386 snprintf(SNPARGS(proto, len), " %s", dst); 387 break; 388 } 389 390 #ifdef INET6 391 if (IS_IP6_FLOW_ID(&(args->f_id))) { 392 if (offset || ip6f_mf) 393 snprintf(SNPARGS(fragment, 0), 394 " (frag %08x:%d@%d%s)", 395 args->f_id.extra, 396 ntohs(ip6->ip6_plen) - hlen, 397 ntohs(offset) << 3, ip6f_mf ? "+" : ""); 398 } else 399 #endif 400 { 401 int ipoff, iplen; 402 ipoff = ntohs(ip->ip_off); 403 iplen = ntohs(ip->ip_len); 404 if (ipoff & (IP_MF | IP_OFFMASK)) 405 snprintf(SNPARGS(fragment, 0), 406 " (frag %d:%d@%d%s)", 407 ntohs(ip->ip_id), iplen - (ip->ip_hl << 2), 408 offset << 3, 409 (ipoff & IP_MF) ? "+" : ""); 410 } 411 } 412 #ifdef __FreeBSD__ 413 log(LOG_SECURITY | LOG_INFO, "ipfw: %d %s %s %s via %s%s\n", 414 f ? f->rulenum : -1, action, proto, 415 args->flags & IPFW_ARGS_OUT ? "out" : "in", args->ifp->if_xname, 416 fragment); 417 #else 418 log(LOG_SECURITY | LOG_INFO, "ipfw: %d %s %s [no if info]%s\n", 419 f ? f->rulenum : -1, action, proto, fragment); 420 #endif 421 if (limit_reached) 422 log(LOG_SECURITY | LOG_NOTICE, 423 "ipfw: limit %d reached on entry %d\n", 424 limit_reached, f ? f->rulenum : -1); 425 } 426 /* end of file */ 427