Commit | Line | Data |
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9fafcd7b PM |
1 | /* SIP extension for IP connection tracking. |
2 | * | |
3 | * (C) 2005 by Christian Hentschel <chentschel@arnet.com.ar> | |
4 | * based on RR's ip_conntrack_ftp.c and other modules. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/ctype.h> | |
13 | #include <linux/skbuff.h> | |
14 | #include <linux/inet.h> | |
15 | #include <linux/in.h> | |
16 | #include <linux/udp.h> | |
1863f096 | 17 | #include <linux/netfilter.h> |
9fafcd7b PM |
18 | |
19 | #include <net/netfilter/nf_conntrack.h> | |
20 | #include <net/netfilter/nf_conntrack_expect.h> | |
21 | #include <net/netfilter/nf_conntrack_helper.h> | |
22 | #include <linux/netfilter/nf_conntrack_sip.h> | |
23 | ||
9fafcd7b PM |
24 | MODULE_LICENSE("GPL"); |
25 | MODULE_AUTHOR("Christian Hentschel <chentschel@arnet.com.ar>"); | |
26 | MODULE_DESCRIPTION("SIP connection tracking helper"); | |
27 | MODULE_ALIAS("ip_conntrack_sip"); | |
28 | ||
29 | #define MAX_PORTS 8 | |
30 | static unsigned short ports[MAX_PORTS]; | |
31 | static int ports_c; | |
32 | module_param_array(ports, ushort, &ports_c, 0400); | |
33 | MODULE_PARM_DESC(ports, "port numbers of SIP servers"); | |
34 | ||
35 | static unsigned int sip_timeout __read_mostly = SIP_TIMEOUT; | |
36 | module_param(sip_timeout, uint, 0600); | |
37 | MODULE_PARM_DESC(sip_timeout, "timeout for the master SIP session"); | |
38 | ||
39 | unsigned int (*nf_nat_sip_hook)(struct sk_buff **pskb, | |
40 | enum ip_conntrack_info ctinfo, | |
41 | struct nf_conn *ct, | |
42 | const char **dptr) __read_mostly; | |
43 | EXPORT_SYMBOL_GPL(nf_nat_sip_hook); | |
44 | ||
45 | unsigned int (*nf_nat_sdp_hook)(struct sk_buff **pskb, | |
46 | enum ip_conntrack_info ctinfo, | |
47 | struct nf_conntrack_expect *exp, | |
48 | const char *dptr) __read_mostly; | |
49 | EXPORT_SYMBOL_GPL(nf_nat_sdp_hook); | |
50 | ||
51 | static int digits_len(struct nf_conn *, const char *, const char *, int *); | |
52 | static int epaddr_len(struct nf_conn *, const char *, const char *, int *); | |
53 | static int skp_digits_len(struct nf_conn *, const char *, const char *, int *); | |
54 | static int skp_epaddr_len(struct nf_conn *, const char *, const char *, int *); | |
55 | ||
56 | struct sip_header_nfo { | |
57 | const char *lname; | |
58 | const char *sname; | |
59 | const char *ln_str; | |
60 | size_t lnlen; | |
61 | size_t snlen; | |
62 | size_t ln_strlen; | |
63 | int case_sensitive; | |
64 | int (*match_len)(struct nf_conn *, const char *, | |
65 | const char *, int *); | |
66 | }; | |
67 | ||
68 | static const struct sip_header_nfo ct_sip_hdrs[] = { | |
69 | [POS_REG_REQ_URI] = { /* SIP REGISTER request URI */ | |
70 | .lname = "sip:", | |
71 | .lnlen = sizeof("sip:") - 1, | |
72 | .ln_str = ":", | |
73 | .ln_strlen = sizeof(":") - 1, | |
74 | .match_len = epaddr_len, | |
75 | }, | |
76 | [POS_REQ_URI] = { /* SIP request URI */ | |
77 | .lname = "sip:", | |
78 | .lnlen = sizeof("sip:") - 1, | |
79 | .ln_str = "@", | |
80 | .ln_strlen = sizeof("@") - 1, | |
81 | .match_len = epaddr_len, | |
82 | }, | |
83 | [POS_FROM] = { /* SIP From header */ | |
84 | .lname = "From:", | |
85 | .lnlen = sizeof("From:") - 1, | |
86 | .sname = "\r\nf:", | |
87 | .snlen = sizeof("\r\nf:") - 1, | |
88 | .ln_str = "sip:", | |
89 | .ln_strlen = sizeof("sip:") - 1, | |
90 | .match_len = skp_epaddr_len, | |
91 | }, | |
92 | [POS_TO] = { /* SIP To header */ | |
93 | .lname = "To:", | |
94 | .lnlen = sizeof("To:") - 1, | |
95 | .sname = "\r\nt:", | |
96 | .snlen = sizeof("\r\nt:") - 1, | |
97 | .ln_str = "sip:", | |
98 | .ln_strlen = sizeof("sip:") - 1, | |
99 | .match_len = skp_epaddr_len | |
100 | }, | |
101 | [POS_VIA] = { /* SIP Via header */ | |
102 | .lname = "Via:", | |
103 | .lnlen = sizeof("Via:") - 1, | |
104 | .sname = "\r\nv:", | |
105 | .snlen = sizeof("\r\nv:") - 1, /* rfc3261 "\r\n" */ | |
106 | .ln_str = "UDP ", | |
107 | .ln_strlen = sizeof("UDP ") - 1, | |
108 | .match_len = epaddr_len, | |
109 | }, | |
110 | [POS_CONTACT] = { /* SIP Contact header */ | |
111 | .lname = "Contact:", | |
112 | .lnlen = sizeof("Contact:") - 1, | |
113 | .sname = "\r\nm:", | |
114 | .snlen = sizeof("\r\nm:") - 1, | |
115 | .ln_str = "sip:", | |
116 | .ln_strlen = sizeof("sip:") - 1, | |
117 | .match_len = skp_epaddr_len | |
118 | }, | |
119 | [POS_CONTENT] = { /* SIP Content length header */ | |
120 | .lname = "Content-Length:", | |
121 | .lnlen = sizeof("Content-Length:") - 1, | |
122 | .sname = "\r\nl:", | |
123 | .snlen = sizeof("\r\nl:") - 1, | |
124 | .ln_str = ":", | |
125 | .ln_strlen = sizeof(":") - 1, | |
126 | .match_len = skp_digits_len | |
127 | }, | |
128 | [POS_MEDIA] = { /* SDP media info */ | |
129 | .case_sensitive = 1, | |
130 | .lname = "\nm=", | |
131 | .lnlen = sizeof("\nm=") - 1, | |
132 | .sname = "\rm=", | |
133 | .snlen = sizeof("\rm=") - 1, | |
134 | .ln_str = "audio ", | |
135 | .ln_strlen = sizeof("audio ") - 1, | |
136 | .match_len = digits_len | |
137 | }, | |
138 | [POS_OWNER_IP4] = { /* SDP owner address*/ | |
139 | .case_sensitive = 1, | |
140 | .lname = "\no=", | |
141 | .lnlen = sizeof("\no=") - 1, | |
142 | .sname = "\ro=", | |
143 | .snlen = sizeof("\ro=") - 1, | |
144 | .ln_str = "IN IP4 ", | |
145 | .ln_strlen = sizeof("IN IP4 ") - 1, | |
146 | .match_len = epaddr_len | |
147 | }, | |
148 | [POS_CONNECTION_IP4] = {/* SDP connection info */ | |
149 | .case_sensitive = 1, | |
150 | .lname = "\nc=", | |
151 | .lnlen = sizeof("\nc=") - 1, | |
152 | .sname = "\rc=", | |
153 | .snlen = sizeof("\rc=") - 1, | |
154 | .ln_str = "IN IP4 ", | |
155 | .ln_strlen = sizeof("IN IP4 ") - 1, | |
156 | .match_len = epaddr_len | |
157 | }, | |
158 | [POS_OWNER_IP6] = { /* SDP owner address*/ | |
159 | .case_sensitive = 1, | |
160 | .lname = "\no=", | |
161 | .lnlen = sizeof("\no=") - 1, | |
162 | .sname = "\ro=", | |
163 | .snlen = sizeof("\ro=") - 1, | |
164 | .ln_str = "IN IP6 ", | |
165 | .ln_strlen = sizeof("IN IP6 ") - 1, | |
166 | .match_len = epaddr_len | |
167 | }, | |
168 | [POS_CONNECTION_IP6] = {/* SDP connection info */ | |
169 | .case_sensitive = 1, | |
170 | .lname = "\nc=", | |
171 | .lnlen = sizeof("\nc=") - 1, | |
172 | .sname = "\rc=", | |
173 | .snlen = sizeof("\rc=") - 1, | |
174 | .ln_str = "IN IP6 ", | |
175 | .ln_strlen = sizeof("IN IP6 ") - 1, | |
176 | .match_len = epaddr_len | |
177 | }, | |
178 | [POS_SDP_HEADER] = { /* SDP version header */ | |
179 | .case_sensitive = 1, | |
180 | .lname = "\nv=", | |
181 | .lnlen = sizeof("\nv=") - 1, | |
182 | .sname = "\rv=", | |
183 | .snlen = sizeof("\rv=") - 1, | |
184 | .ln_str = "=", | |
185 | .ln_strlen = sizeof("=") - 1, | |
186 | .match_len = digits_len | |
187 | } | |
188 | }; | |
189 | ||
190 | /* get line lenght until first CR or LF seen. */ | |
191 | int ct_sip_lnlen(const char *line, const char *limit) | |
192 | { | |
193 | const char *k = line; | |
194 | ||
195 | while ((line <= limit) && (*line == '\r' || *line == '\n')) | |
196 | line++; | |
197 | ||
198 | while (line <= limit) { | |
199 | if (*line == '\r' || *line == '\n') | |
200 | break; | |
201 | line++; | |
202 | } | |
203 | return line - k; | |
204 | } | |
205 | EXPORT_SYMBOL_GPL(ct_sip_lnlen); | |
206 | ||
207 | /* Linear string search, case sensitive. */ | |
208 | const char *ct_sip_search(const char *needle, const char *haystack, | |
209 | size_t needle_len, size_t haystack_len, | |
210 | int case_sensitive) | |
211 | { | |
212 | const char *limit = haystack + (haystack_len - needle_len); | |
213 | ||
214 | while (haystack <= limit) { | |
215 | if (case_sensitive) { | |
216 | if (strncmp(haystack, needle, needle_len) == 0) | |
217 | return haystack; | |
218 | } else { | |
219 | if (strnicmp(haystack, needle, needle_len) == 0) | |
220 | return haystack; | |
221 | } | |
222 | haystack++; | |
223 | } | |
224 | return NULL; | |
225 | } | |
226 | EXPORT_SYMBOL_GPL(ct_sip_search); | |
227 | ||
228 | static int digits_len(struct nf_conn *ct, const char *dptr, | |
229 | const char *limit, int *shift) | |
230 | { | |
231 | int len = 0; | |
232 | while (dptr <= limit && isdigit(*dptr)) { | |
233 | dptr++; | |
234 | len++; | |
235 | } | |
236 | return len; | |
237 | } | |
238 | ||
239 | /* get digits lenght, skiping blank spaces. */ | |
240 | static int skp_digits_len(struct nf_conn *ct, const char *dptr, | |
241 | const char *limit, int *shift) | |
242 | { | |
243 | for (; dptr <= limit && *dptr == ' '; dptr++) | |
244 | (*shift)++; | |
245 | ||
246 | return digits_len(ct, dptr, limit, shift); | |
247 | } | |
248 | ||
249 | static int parse_addr(struct nf_conn *ct, const char *cp, const char **endp, | |
250 | union nf_conntrack_address *addr, const char *limit) | |
251 | { | |
252 | const char *end; | |
253 | int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
254 | int ret = 0; | |
255 | ||
256 | switch (family) { | |
257 | case AF_INET: | |
258 | ret = in4_pton(cp, limit - cp, (u8 *)&addr->ip, -1, &end); | |
259 | break; | |
260 | case AF_INET6: | |
261 | ret = in6_pton(cp, limit - cp, (u8 *)&addr->ip6, -1, &end); | |
262 | break; | |
263 | default: | |
264 | BUG(); | |
265 | } | |
266 | ||
267 | if (ret == 0 || end == cp) | |
268 | return 0; | |
269 | if (endp) | |
270 | *endp = end; | |
271 | return 1; | |
272 | } | |
273 | ||
274 | /* skip ip address. returns its length. */ | |
275 | static int epaddr_len(struct nf_conn *ct, const char *dptr, | |
276 | const char *limit, int *shift) | |
277 | { | |
278 | union nf_conntrack_address addr; | |
279 | const char *aux = dptr; | |
280 | ||
281 | if (!parse_addr(ct, dptr, &dptr, &addr, limit)) { | |
0d53778e | 282 | pr_debug("ip: %s parse failed.!\n", dptr); |
9fafcd7b PM |
283 | return 0; |
284 | } | |
285 | ||
286 | /* Port number */ | |
287 | if (*dptr == ':') { | |
288 | dptr++; | |
289 | dptr += digits_len(ct, dptr, limit, shift); | |
290 | } | |
291 | return dptr - aux; | |
292 | } | |
293 | ||
294 | /* get address length, skiping user info. */ | |
295 | static int skp_epaddr_len(struct nf_conn *ct, const char *dptr, | |
296 | const char *limit, int *shift) | |
297 | { | |
aa584eda | 298 | const char *start = dptr; |
9fafcd7b PM |
299 | int s = *shift; |
300 | ||
7da5bfbb LI |
301 | /* Search for @, but stop at the end of the line. |
302 | * We are inside a sip: URI, so we don't need to worry about | |
303 | * continuation lines. */ | |
304 | while (dptr <= limit && | |
305 | *dptr != '@' && *dptr != '\r' && *dptr != '\n') { | |
9fafcd7b | 306 | (*shift)++; |
7da5bfbb LI |
307 | dptr++; |
308 | } | |
9fafcd7b | 309 | |
adcb4711 | 310 | if (dptr <= limit && *dptr == '@') { |
9fafcd7b PM |
311 | dptr++; |
312 | (*shift)++; | |
aa584eda PM |
313 | } else { |
314 | dptr = start; | |
9fafcd7b | 315 | *shift = s; |
aa584eda | 316 | } |
9fafcd7b PM |
317 | |
318 | return epaddr_len(ct, dptr, limit, shift); | |
319 | } | |
320 | ||
321 | /* Returns 0 if not found, -1 error parsing. */ | |
322 | int ct_sip_get_info(struct nf_conn *ct, | |
323 | const char *dptr, size_t dlen, | |
324 | unsigned int *matchoff, | |
325 | unsigned int *matchlen, | |
326 | enum sip_header_pos pos) | |
327 | { | |
328 | const struct sip_header_nfo *hnfo = &ct_sip_hdrs[pos]; | |
329 | const char *limit, *aux, *k = dptr; | |
330 | int shift = 0; | |
331 | ||
332 | limit = dptr + (dlen - hnfo->lnlen); | |
333 | ||
334 | while (dptr <= limit) { | |
335 | if ((strncmp(dptr, hnfo->lname, hnfo->lnlen) != 0) && | |
465f90a4 PM |
336 | (hnfo->sname == NULL || |
337 | strncmp(dptr, hnfo->sname, hnfo->snlen) != 0)) { | |
9fafcd7b PM |
338 | dptr++; |
339 | continue; | |
340 | } | |
341 | aux = ct_sip_search(hnfo->ln_str, dptr, hnfo->ln_strlen, | |
601e68e1 | 342 | ct_sip_lnlen(dptr, limit), |
9fafcd7b PM |
343 | hnfo->case_sensitive); |
344 | if (!aux) { | |
0d53778e PM |
345 | pr_debug("'%s' not found in '%s'.\n", hnfo->ln_str, |
346 | hnfo->lname); | |
9fafcd7b PM |
347 | return -1; |
348 | } | |
349 | aux += hnfo->ln_strlen; | |
350 | ||
351 | *matchlen = hnfo->match_len(ct, aux, limit, &shift); | |
352 | if (!*matchlen) | |
353 | return -1; | |
354 | ||
355 | *matchoff = (aux - k) + shift; | |
356 | ||
0d53778e PM |
357 | pr_debug("%s match succeeded! - len: %u\n", hnfo->lname, |
358 | *matchlen); | |
9fafcd7b PM |
359 | return 1; |
360 | } | |
0d53778e | 361 | pr_debug("%s header not found.\n", hnfo->lname); |
9fafcd7b PM |
362 | return 0; |
363 | } | |
364 | EXPORT_SYMBOL_GPL(ct_sip_get_info); | |
365 | ||
366 | static int set_expected_rtp(struct sk_buff **pskb, | |
367 | struct nf_conn *ct, | |
368 | enum ip_conntrack_info ctinfo, | |
369 | union nf_conntrack_address *addr, | |
370 | __be16 port, | |
371 | const char *dptr) | |
372 | { | |
373 | struct nf_conntrack_expect *exp; | |
374 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); | |
375 | int family = ct->tuplehash[!dir].tuple.src.l3num; | |
376 | int ret; | |
377 | typeof(nf_nat_sdp_hook) nf_nat_sdp; | |
378 | ||
6823645d | 379 | exp = nf_ct_expect_alloc(ct); |
9fafcd7b PM |
380 | if (exp == NULL) |
381 | return NF_DROP; | |
6823645d PM |
382 | nf_ct_expect_init(exp, family, |
383 | &ct->tuplehash[!dir].tuple.src.u3, addr, | |
384 | IPPROTO_UDP, NULL, &port); | |
9fafcd7b PM |
385 | |
386 | nf_nat_sdp = rcu_dereference(nf_nat_sdp_hook); | |
387 | if (nf_nat_sdp && ct->status & IPS_NAT_MASK) | |
388 | ret = nf_nat_sdp(pskb, ctinfo, exp, dptr); | |
389 | else { | |
6823645d | 390 | if (nf_ct_expect_related(exp) != 0) |
9fafcd7b PM |
391 | ret = NF_DROP; |
392 | else | |
393 | ret = NF_ACCEPT; | |
394 | } | |
6823645d | 395 | nf_ct_expect_put(exp); |
9fafcd7b PM |
396 | |
397 | return ret; | |
398 | } | |
399 | ||
400 | static int sip_help(struct sk_buff **pskb, | |
401 | unsigned int protoff, | |
402 | struct nf_conn *ct, | |
403 | enum ip_conntrack_info ctinfo) | |
404 | { | |
405 | int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
406 | union nf_conntrack_address addr; | |
407 | unsigned int dataoff, datalen; | |
408 | const char *dptr; | |
409 | int ret = NF_ACCEPT; | |
410 | int matchoff, matchlen; | |
411 | u_int16_t port; | |
412 | enum sip_header_pos pos; | |
413 | typeof(nf_nat_sip_hook) nf_nat_sip; | |
414 | ||
415 | /* No Data ? */ | |
416 | dataoff = protoff + sizeof(struct udphdr); | |
417 | if (dataoff >= (*pskb)->len) | |
418 | return NF_ACCEPT; | |
419 | ||
420 | nf_ct_refresh(ct, *pskb, sip_timeout * HZ); | |
421 | ||
422 | if (!skb_is_nonlinear(*pskb)) | |
423 | dptr = (*pskb)->data + dataoff; | |
424 | else { | |
0d53778e | 425 | pr_debug("Copy of skbuff not supported yet.\n"); |
9fafcd7b PM |
426 | goto out; |
427 | } | |
428 | ||
429 | nf_nat_sip = rcu_dereference(nf_nat_sip_hook); | |
430 | if (nf_nat_sip && ct->status & IPS_NAT_MASK) { | |
431 | if (!nf_nat_sip(pskb, ctinfo, ct, &dptr)) { | |
432 | ret = NF_DROP; | |
433 | goto out; | |
434 | } | |
435 | } | |
436 | ||
437 | datalen = (*pskb)->len - dataoff; | |
438 | if (datalen < sizeof("SIP/2.0 200") - 1) | |
439 | goto out; | |
440 | ||
441 | /* RTP info only in some SDP pkts */ | |
442 | if (memcmp(dptr, "INVITE", sizeof("INVITE") - 1) != 0 && | |
d258131a JB |
443 | memcmp(dptr, "UPDATE", sizeof("UPDATE") - 1) != 0 && |
444 | memcmp(dptr, "SIP/2.0 180", sizeof("SIP/2.0 180") - 1) != 0 && | |
445 | memcmp(dptr, "SIP/2.0 183", sizeof("SIP/2.0 183") - 1) != 0 && | |
9fafcd7b PM |
446 | memcmp(dptr, "SIP/2.0 200", sizeof("SIP/2.0 200") - 1) != 0) { |
447 | goto out; | |
448 | } | |
449 | /* Get address and port from SDP packet. */ | |
450 | pos = family == AF_INET ? POS_CONNECTION_IP4 : POS_CONNECTION_IP6; | |
451 | if (ct_sip_get_info(ct, dptr, datalen, &matchoff, &matchlen, pos) > 0) { | |
452 | ||
453 | /* We'll drop only if there are parse problems. */ | |
454 | if (!parse_addr(ct, dptr + matchoff, NULL, &addr, | |
601e68e1 | 455 | dptr + datalen)) { |
9fafcd7b PM |
456 | ret = NF_DROP; |
457 | goto out; | |
458 | } | |
459 | if (ct_sip_get_info(ct, dptr, datalen, &matchoff, &matchlen, | |
601e68e1 | 460 | POS_MEDIA) > 0) { |
9fafcd7b PM |
461 | |
462 | port = simple_strtoul(dptr + matchoff, NULL, 10); | |
463 | if (port < 1024) { | |
464 | ret = NF_DROP; | |
465 | goto out; | |
466 | } | |
467 | ret = set_expected_rtp(pskb, ct, ctinfo, &addr, | |
468 | htons(port), dptr); | |
469 | } | |
470 | } | |
471 | out: | |
472 | return ret; | |
473 | } | |
474 | ||
475 | static struct nf_conntrack_helper sip[MAX_PORTS][2] __read_mostly; | |
476 | static char sip_names[MAX_PORTS][2][sizeof("sip-65535")] __read_mostly; | |
477 | ||
478 | static void nf_conntrack_sip_fini(void) | |
479 | { | |
480 | int i, j; | |
481 | ||
482 | for (i = 0; i < ports_c; i++) { | |
483 | for (j = 0; j < 2; j++) { | |
484 | if (sip[i][j].me == NULL) | |
485 | continue; | |
486 | nf_conntrack_helper_unregister(&sip[i][j]); | |
487 | } | |
488 | } | |
489 | } | |
490 | ||
491 | static int __init nf_conntrack_sip_init(void) | |
492 | { | |
493 | int i, j, ret; | |
494 | char *tmpname; | |
495 | ||
496 | if (ports_c == 0) | |
497 | ports[ports_c++] = SIP_PORT; | |
498 | ||
499 | for (i = 0; i < ports_c; i++) { | |
500 | memset(&sip[i], 0, sizeof(sip[i])); | |
501 | ||
502 | sip[i][0].tuple.src.l3num = AF_INET; | |
503 | sip[i][1].tuple.src.l3num = AF_INET6; | |
504 | for (j = 0; j < 2; j++) { | |
505 | sip[i][j].tuple.dst.protonum = IPPROTO_UDP; | |
506 | sip[i][j].tuple.src.u.udp.port = htons(ports[i]); | |
9fafcd7b PM |
507 | sip[i][j].max_expected = 2; |
508 | sip[i][j].timeout = 3 * 60; /* 3 minutes */ | |
509 | sip[i][j].me = THIS_MODULE; | |
510 | sip[i][j].help = sip_help; | |
511 | ||
512 | tmpname = &sip_names[i][j][0]; | |
513 | if (ports[i] == SIP_PORT) | |
514 | sprintf(tmpname, "sip"); | |
515 | else | |
516 | sprintf(tmpname, "sip-%u", i); | |
517 | sip[i][j].name = tmpname; | |
518 | ||
0d53778e | 519 | pr_debug("port #%u: %u\n", i, ports[i]); |
9fafcd7b PM |
520 | |
521 | ret = nf_conntrack_helper_register(&sip[i][j]); | |
522 | if (ret) { | |
523 | printk("nf_ct_sip: failed to register helper " | |
524 | "for pf: %u port: %u\n", | |
525 | sip[i][j].tuple.src.l3num, ports[i]); | |
526 | nf_conntrack_sip_fini(); | |
527 | return ret; | |
528 | } | |
529 | } | |
530 | } | |
531 | return 0; | |
532 | } | |
533 | ||
534 | module_init(nf_conntrack_sip_init); | |
535 | module_exit(nf_conntrack_sip_fini); |