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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]; | |
2f0d2f10 | 31 | static unsigned int ports_c; |
9fafcd7b PM |
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 | ||
3db05fea | 39 | unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb, |
9fafcd7b PM |
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 | ||
3db05fea | 45 | unsigned int (*nf_nat_sdp_hook)(struct sk_buff *skb, |
9fafcd7b PM |
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 | ||
13f7d63c JE |
51 | static int digits_len(const struct nf_conn *, const char *, const char *, int *); |
52 | static int epaddr_len(const struct nf_conn *, const char *, const char *, int *); | |
53 | static int skp_digits_len(const struct nf_conn *, const char *, const char *, int *); | |
54 | static int skp_epaddr_len(const struct nf_conn *, const char *, const char *, int *); | |
9fafcd7b PM |
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; | |
13f7d63c | 64 | int (*match_len)(const struct nf_conn *, const char *, |
9fafcd7b PM |
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 | ||
c8238177 | 190 | /* get line length until first CR or LF seen. */ |
9fafcd7b PM |
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 | ||
13f7d63c | 228 | static int digits_len(const struct nf_conn *ct, const char *dptr, |
9fafcd7b PM |
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 | ||
c8238177 | 239 | /* get digits length, skipping blank spaces. */ |
13f7d63c | 240 | static int skp_digits_len(const struct nf_conn *ct, const char *dptr, |
9fafcd7b PM |
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 | ||
13f7d63c JE |
249 | static int parse_addr(const struct nf_conn *ct, const char *cp, |
250 | const char **endp, union nf_inet_addr *addr, | |
251 | const char *limit) | |
9fafcd7b PM |
252 | { |
253 | const char *end; | |
254 | int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
255 | int ret = 0; | |
256 | ||
257 | switch (family) { | |
258 | case AF_INET: | |
259 | ret = in4_pton(cp, limit - cp, (u8 *)&addr->ip, -1, &end); | |
260 | break; | |
261 | case AF_INET6: | |
262 | ret = in6_pton(cp, limit - cp, (u8 *)&addr->ip6, -1, &end); | |
263 | break; | |
264 | default: | |
265 | BUG(); | |
266 | } | |
267 | ||
268 | if (ret == 0 || end == cp) | |
269 | return 0; | |
270 | if (endp) | |
271 | *endp = end; | |
272 | return 1; | |
273 | } | |
274 | ||
275 | /* skip ip address. returns its length. */ | |
13f7d63c | 276 | static int epaddr_len(const struct nf_conn *ct, const char *dptr, |
9fafcd7b PM |
277 | const char *limit, int *shift) |
278 | { | |
643a2c15 | 279 | union nf_inet_addr addr; |
9fafcd7b PM |
280 | const char *aux = dptr; |
281 | ||
282 | if (!parse_addr(ct, dptr, &dptr, &addr, limit)) { | |
0d53778e | 283 | pr_debug("ip: %s parse failed.!\n", dptr); |
9fafcd7b PM |
284 | return 0; |
285 | } | |
286 | ||
287 | /* Port number */ | |
288 | if (*dptr == ':') { | |
289 | dptr++; | |
290 | dptr += digits_len(ct, dptr, limit, shift); | |
291 | } | |
292 | return dptr - aux; | |
293 | } | |
294 | ||
295 | /* get address length, skiping user info. */ | |
13f7d63c | 296 | static int skp_epaddr_len(const struct nf_conn *ct, const char *dptr, |
9fafcd7b PM |
297 | const char *limit, int *shift) |
298 | { | |
aa584eda | 299 | const char *start = dptr; |
9fafcd7b PM |
300 | int s = *shift; |
301 | ||
7da5bfbb LI |
302 | /* Search for @, but stop at the end of the line. |
303 | * We are inside a sip: URI, so we don't need to worry about | |
304 | * continuation lines. */ | |
305 | while (dptr <= limit && | |
306 | *dptr != '@' && *dptr != '\r' && *dptr != '\n') { | |
9fafcd7b | 307 | (*shift)++; |
7da5bfbb LI |
308 | dptr++; |
309 | } | |
9fafcd7b | 310 | |
adcb4711 | 311 | if (dptr <= limit && *dptr == '@') { |
9fafcd7b PM |
312 | dptr++; |
313 | (*shift)++; | |
aa584eda PM |
314 | } else { |
315 | dptr = start; | |
9fafcd7b | 316 | *shift = s; |
aa584eda | 317 | } |
9fafcd7b PM |
318 | |
319 | return epaddr_len(ct, dptr, limit, shift); | |
320 | } | |
321 | ||
322 | /* Returns 0 if not found, -1 error parsing. */ | |
13f7d63c | 323 | int ct_sip_get_info(const struct nf_conn *ct, |
9fafcd7b PM |
324 | const char *dptr, size_t dlen, |
325 | unsigned int *matchoff, | |
326 | unsigned int *matchlen, | |
327 | enum sip_header_pos pos) | |
328 | { | |
329 | const struct sip_header_nfo *hnfo = &ct_sip_hdrs[pos]; | |
330 | const char *limit, *aux, *k = dptr; | |
331 | int shift = 0; | |
332 | ||
333 | limit = dptr + (dlen - hnfo->lnlen); | |
334 | ||
335 | while (dptr <= limit) { | |
336 | if ((strncmp(dptr, hnfo->lname, hnfo->lnlen) != 0) && | |
465f90a4 PM |
337 | (hnfo->sname == NULL || |
338 | strncmp(dptr, hnfo->sname, hnfo->snlen) != 0)) { | |
9fafcd7b PM |
339 | dptr++; |
340 | continue; | |
341 | } | |
342 | aux = ct_sip_search(hnfo->ln_str, dptr, hnfo->ln_strlen, | |
601e68e1 | 343 | ct_sip_lnlen(dptr, limit), |
9fafcd7b PM |
344 | hnfo->case_sensitive); |
345 | if (!aux) { | |
0d53778e PM |
346 | pr_debug("'%s' not found in '%s'.\n", hnfo->ln_str, |
347 | hnfo->lname); | |
9fafcd7b PM |
348 | return -1; |
349 | } | |
350 | aux += hnfo->ln_strlen; | |
351 | ||
352 | *matchlen = hnfo->match_len(ct, aux, limit, &shift); | |
353 | if (!*matchlen) | |
354 | return -1; | |
355 | ||
356 | *matchoff = (aux - k) + shift; | |
357 | ||
0d53778e PM |
358 | pr_debug("%s match succeeded! - len: %u\n", hnfo->lname, |
359 | *matchlen); | |
9fafcd7b PM |
360 | return 1; |
361 | } | |
0d53778e | 362 | pr_debug("%s header not found.\n", hnfo->lname); |
9fafcd7b PM |
363 | return 0; |
364 | } | |
365 | EXPORT_SYMBOL_GPL(ct_sip_get_info); | |
366 | ||
3db05fea | 367 | static int set_expected_rtp(struct sk_buff *skb, |
9fafcd7b PM |
368 | struct nf_conn *ct, |
369 | enum ip_conntrack_info ctinfo, | |
643a2c15 | 370 | union nf_inet_addr *addr, |
9fafcd7b PM |
371 | __be16 port, |
372 | const char *dptr) | |
373 | { | |
374 | struct nf_conntrack_expect *exp; | |
375 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); | |
376 | int family = ct->tuplehash[!dir].tuple.src.l3num; | |
377 | int ret; | |
378 | typeof(nf_nat_sdp_hook) nf_nat_sdp; | |
379 | ||
6823645d | 380 | exp = nf_ct_expect_alloc(ct); |
9fafcd7b PM |
381 | if (exp == NULL) |
382 | return NF_DROP; | |
6002f266 | 383 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, family, |
6823645d PM |
384 | &ct->tuplehash[!dir].tuple.src.u3, addr, |
385 | IPPROTO_UDP, NULL, &port); | |
9fafcd7b PM |
386 | |
387 | nf_nat_sdp = rcu_dereference(nf_nat_sdp_hook); | |
388 | if (nf_nat_sdp && ct->status & IPS_NAT_MASK) | |
3db05fea | 389 | ret = nf_nat_sdp(skb, ctinfo, exp, dptr); |
9fafcd7b | 390 | else { |
6823645d | 391 | if (nf_ct_expect_related(exp) != 0) |
9fafcd7b PM |
392 | ret = NF_DROP; |
393 | else | |
394 | ret = NF_ACCEPT; | |
395 | } | |
6823645d | 396 | nf_ct_expect_put(exp); |
9fafcd7b PM |
397 | |
398 | return ret; | |
399 | } | |
400 | ||
3db05fea | 401 | static int sip_help(struct sk_buff *skb, |
9fafcd7b PM |
402 | unsigned int protoff, |
403 | struct nf_conn *ct, | |
404 | enum ip_conntrack_info ctinfo) | |
405 | { | |
406 | int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
643a2c15 | 407 | union nf_inet_addr addr; |
9fafcd7b PM |
408 | unsigned int dataoff, datalen; |
409 | const char *dptr; | |
410 | int ret = NF_ACCEPT; | |
2f0d2f10 | 411 | unsigned int matchoff, matchlen; |
9fafcd7b PM |
412 | u_int16_t port; |
413 | enum sip_header_pos pos; | |
414 | typeof(nf_nat_sip_hook) nf_nat_sip; | |
415 | ||
416 | /* No Data ? */ | |
417 | dataoff = protoff + sizeof(struct udphdr); | |
3db05fea | 418 | if (dataoff >= skb->len) |
9fafcd7b PM |
419 | return NF_ACCEPT; |
420 | ||
3db05fea | 421 | nf_ct_refresh(ct, skb, sip_timeout * HZ); |
9fafcd7b | 422 | |
3db05fea HX |
423 | if (!skb_is_nonlinear(skb)) |
424 | dptr = skb->data + dataoff; | |
9fafcd7b | 425 | else { |
0d53778e | 426 | pr_debug("Copy of skbuff not supported yet.\n"); |
9fafcd7b PM |
427 | goto out; |
428 | } | |
429 | ||
430 | nf_nat_sip = rcu_dereference(nf_nat_sip_hook); | |
431 | if (nf_nat_sip && ct->status & IPS_NAT_MASK) { | |
3db05fea | 432 | if (!nf_nat_sip(skb, ctinfo, ct, &dptr)) { |
9fafcd7b PM |
433 | ret = NF_DROP; |
434 | goto out; | |
435 | } | |
436 | } | |
437 | ||
3db05fea | 438 | datalen = skb->len - dataoff; |
9fafcd7b PM |
439 | if (datalen < sizeof("SIP/2.0 200") - 1) |
440 | goto out; | |
441 | ||
442 | /* RTP info only in some SDP pkts */ | |
443 | if (memcmp(dptr, "INVITE", sizeof("INVITE") - 1) != 0 && | |
d258131a JB |
444 | memcmp(dptr, "UPDATE", sizeof("UPDATE") - 1) != 0 && |
445 | memcmp(dptr, "SIP/2.0 180", sizeof("SIP/2.0 180") - 1) != 0 && | |
446 | memcmp(dptr, "SIP/2.0 183", sizeof("SIP/2.0 183") - 1) != 0 && | |
9fafcd7b PM |
447 | memcmp(dptr, "SIP/2.0 200", sizeof("SIP/2.0 200") - 1) != 0) { |
448 | goto out; | |
449 | } | |
450 | /* Get address and port from SDP packet. */ | |
451 | pos = family == AF_INET ? POS_CONNECTION_IP4 : POS_CONNECTION_IP6; | |
452 | if (ct_sip_get_info(ct, dptr, datalen, &matchoff, &matchlen, pos) > 0) { | |
453 | ||
454 | /* We'll drop only if there are parse problems. */ | |
455 | if (!parse_addr(ct, dptr + matchoff, NULL, &addr, | |
601e68e1 | 456 | dptr + datalen)) { |
9fafcd7b PM |
457 | ret = NF_DROP; |
458 | goto out; | |
459 | } | |
460 | if (ct_sip_get_info(ct, dptr, datalen, &matchoff, &matchlen, | |
601e68e1 | 461 | POS_MEDIA) > 0) { |
9fafcd7b PM |
462 | |
463 | port = simple_strtoul(dptr + matchoff, NULL, 10); | |
464 | if (port < 1024) { | |
465 | ret = NF_DROP; | |
466 | goto out; | |
467 | } | |
3db05fea | 468 | ret = set_expected_rtp(skb, ct, ctinfo, &addr, |
9fafcd7b PM |
469 | htons(port), dptr); |
470 | } | |
471 | } | |
472 | out: | |
473 | return ret; | |
474 | } | |
475 | ||
476 | static struct nf_conntrack_helper sip[MAX_PORTS][2] __read_mostly; | |
477 | static char sip_names[MAX_PORTS][2][sizeof("sip-65535")] __read_mostly; | |
478 | ||
6002f266 PM |
479 | static const struct nf_conntrack_expect_policy sip_exp_policy = { |
480 | .max_expected = 2, | |
481 | .timeout = 3 * 60, | |
482 | }; | |
483 | ||
9fafcd7b PM |
484 | static void nf_conntrack_sip_fini(void) |
485 | { | |
486 | int i, j; | |
487 | ||
488 | for (i = 0; i < ports_c; i++) { | |
489 | for (j = 0; j < 2; j++) { | |
490 | if (sip[i][j].me == NULL) | |
491 | continue; | |
492 | nf_conntrack_helper_unregister(&sip[i][j]); | |
493 | } | |
494 | } | |
495 | } | |
496 | ||
497 | static int __init nf_conntrack_sip_init(void) | |
498 | { | |
499 | int i, j, ret; | |
500 | char *tmpname; | |
501 | ||
502 | if (ports_c == 0) | |
503 | ports[ports_c++] = SIP_PORT; | |
504 | ||
505 | for (i = 0; i < ports_c; i++) { | |
506 | memset(&sip[i], 0, sizeof(sip[i])); | |
507 | ||
508 | sip[i][0].tuple.src.l3num = AF_INET; | |
509 | sip[i][1].tuple.src.l3num = AF_INET6; | |
510 | for (j = 0; j < 2; j++) { | |
511 | sip[i][j].tuple.dst.protonum = IPPROTO_UDP; | |
512 | sip[i][j].tuple.src.u.udp.port = htons(ports[i]); | |
6002f266 | 513 | sip[i][j].expect_policy = &sip_exp_policy; |
9fafcd7b PM |
514 | sip[i][j].me = THIS_MODULE; |
515 | sip[i][j].help = sip_help; | |
516 | ||
517 | tmpname = &sip_names[i][j][0]; | |
518 | if (ports[i] == SIP_PORT) | |
519 | sprintf(tmpname, "sip"); | |
520 | else | |
521 | sprintf(tmpname, "sip-%u", i); | |
522 | sip[i][j].name = tmpname; | |
523 | ||
0d53778e | 524 | pr_debug("port #%u: %u\n", i, ports[i]); |
9fafcd7b PM |
525 | |
526 | ret = nf_conntrack_helper_register(&sip[i][j]); | |
527 | if (ret) { | |
528 | printk("nf_ct_sip: failed to register helper " | |
529 | "for pf: %u port: %u\n", | |
530 | sip[i][j].tuple.src.l3num, ports[i]); | |
531 | nf_conntrack_sip_fini(); | |
532 | return ret; | |
533 | } | |
534 | } | |
535 | } | |
536 | return 0; | |
537 | } | |
538 | ||
539 | module_init(nf_conntrack_sip_init); | |
540 | module_exit(nf_conntrack_sip_fini); |