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