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
ipfw_log(struct ip_fw_chain * chain,struct ip_fw * f,u_int hlen,struct ip_fw_args * args,u_short offset,uint32_t tablearg,struct ip * ip)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