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f587de0e PM |
1 | /* |
2 | * H.323 connection tracking helper | |
3 | * | |
4 | * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net> | |
f229f6ce | 5 | * Copyright (c) 2006-2012 Patrick McHardy <kaber@trash.net> |
f587de0e PM |
6 | * |
7 | * This source code is licensed under General Public License version 2. | |
8 | * | |
9 | * Based on the 'brute force' H.323 connection tracking module by | |
10 | * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> | |
11 | * | |
12 | * For more information, please see http://nath323.sourceforge.net/ | |
13 | */ | |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/moduleparam.h> | |
17 | #include <linux/ctype.h> | |
18 | #include <linux/inet.h> | |
19 | #include <linux/in.h> | |
20 | #include <linux/ip.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
f587de0e PM |
22 | #include <linux/udp.h> |
23 | #include <linux/tcp.h> | |
24 | #include <linux/skbuff.h> | |
25 | #include <net/route.h> | |
26 | #include <net/ip6_route.h> | |
27 | ||
28 | #include <net/netfilter/nf_conntrack.h> | |
29 | #include <net/netfilter/nf_conntrack_core.h> | |
30 | #include <net/netfilter/nf_conntrack_tuple.h> | |
31 | #include <net/netfilter/nf_conntrack_expect.h> | |
32 | #include <net/netfilter/nf_conntrack_ecache.h> | |
33 | #include <net/netfilter/nf_conntrack_helper.h> | |
5d0aa2cc | 34 | #include <net/netfilter/nf_conntrack_zones.h> |
f587de0e PM |
35 | #include <linux/netfilter/nf_conntrack_h323.h> |
36 | ||
f587de0e PM |
37 | /* Parameters */ |
38 | static unsigned int default_rrq_ttl __read_mostly = 300; | |
39 | module_param(default_rrq_ttl, uint, 0600); | |
40 | MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ"); | |
41 | ||
42 | static int gkrouted_only __read_mostly = 1; | |
43 | module_param(gkrouted_only, int, 0600); | |
44 | MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper"); | |
45 | ||
eb939922 | 46 | static bool callforward_filter __read_mostly = true; |
f587de0e PM |
47 | module_param(callforward_filter, bool, 0600); |
48 | MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations " | |
601e68e1 | 49 | "if both endpoints are on different sides " |
f587de0e PM |
50 | "(determined by routing information)"); |
51 | ||
52 | /* Hooks for NAT */ | |
051966c0 | 53 | int (*set_h245_addr_hook) (struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
54 | unsigned char **data, int dataoff, |
55 | H245_TransportAddress *taddr, | |
643a2c15 | 56 | union nf_inet_addr *addr, __be16 port) |
f587de0e | 57 | __read_mostly; |
051966c0 | 58 | int (*set_h225_addr_hook) (struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
59 | unsigned char **data, int dataoff, |
60 | TransportAddress *taddr, | |
643a2c15 | 61 | union nf_inet_addr *addr, __be16 port) |
f587de0e | 62 | __read_mostly; |
3db05fea | 63 | int (*set_sig_addr_hook) (struct sk_buff *skb, |
f587de0e PM |
64 | struct nf_conn *ct, |
65 | enum ip_conntrack_info ctinfo, | |
051966c0 | 66 | unsigned int protoff, unsigned char **data, |
f587de0e | 67 | TransportAddress *taddr, int count) __read_mostly; |
3db05fea | 68 | int (*set_ras_addr_hook) (struct sk_buff *skb, |
f587de0e PM |
69 | struct nf_conn *ct, |
70 | enum ip_conntrack_info ctinfo, | |
051966c0 | 71 | unsigned int protoff, unsigned char **data, |
f587de0e | 72 | TransportAddress *taddr, int count) __read_mostly; |
3db05fea | 73 | int (*nat_rtp_rtcp_hook) (struct sk_buff *skb, |
f587de0e PM |
74 | struct nf_conn *ct, |
75 | enum ip_conntrack_info ctinfo, | |
051966c0 | 76 | unsigned int protoff, |
f587de0e PM |
77 | unsigned char **data, int dataoff, |
78 | H245_TransportAddress *taddr, | |
79 | __be16 port, __be16 rtp_port, | |
80 | struct nf_conntrack_expect *rtp_exp, | |
81 | struct nf_conntrack_expect *rtcp_exp) __read_mostly; | |
3db05fea | 82 | int (*nat_t120_hook) (struct sk_buff *skb, |
f587de0e PM |
83 | struct nf_conn *ct, |
84 | enum ip_conntrack_info ctinfo, | |
051966c0 | 85 | unsigned int protoff, |
f587de0e PM |
86 | unsigned char **data, int dataoff, |
87 | H245_TransportAddress *taddr, __be16 port, | |
88 | struct nf_conntrack_expect *exp) __read_mostly; | |
3db05fea | 89 | int (*nat_h245_hook) (struct sk_buff *skb, |
f587de0e PM |
90 | struct nf_conn *ct, |
91 | enum ip_conntrack_info ctinfo, | |
051966c0 | 92 | unsigned int protoff, |
f587de0e PM |
93 | unsigned char **data, int dataoff, |
94 | TransportAddress *taddr, __be16 port, | |
95 | struct nf_conntrack_expect *exp) __read_mostly; | |
3db05fea | 96 | int (*nat_callforwarding_hook) (struct sk_buff *skb, |
f587de0e PM |
97 | struct nf_conn *ct, |
98 | enum ip_conntrack_info ctinfo, | |
051966c0 | 99 | unsigned int protoff, |
f587de0e PM |
100 | unsigned char **data, int dataoff, |
101 | TransportAddress *taddr, __be16 port, | |
102 | struct nf_conntrack_expect *exp) __read_mostly; | |
3db05fea | 103 | int (*nat_q931_hook) (struct sk_buff *skb, |
f587de0e PM |
104 | struct nf_conn *ct, |
105 | enum ip_conntrack_info ctinfo, | |
051966c0 | 106 | unsigned int protoff, |
f587de0e PM |
107 | unsigned char **data, TransportAddress *taddr, int idx, |
108 | __be16 port, struct nf_conntrack_expect *exp) | |
109 | __read_mostly; | |
110 | ||
111 | static DEFINE_SPINLOCK(nf_h323_lock); | |
112 | static char *h323_buffer; | |
113 | ||
114 | static struct nf_conntrack_helper nf_conntrack_helper_h245; | |
115 | static struct nf_conntrack_helper nf_conntrack_helper_q931[]; | |
116 | static struct nf_conntrack_helper nf_conntrack_helper_ras[]; | |
117 | ||
118 | /****************************************************************************/ | |
3db05fea | 119 | static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
120 | struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
121 | unsigned char **data, int *datalen, int *dataoff) | |
122 | { | |
1afc5679 | 123 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
f587de0e | 124 | int dir = CTINFO2DIR(ctinfo); |
905e3e8e JE |
125 | const struct tcphdr *th; |
126 | struct tcphdr _tcph; | |
f587de0e PM |
127 | int tcpdatalen; |
128 | int tcpdataoff; | |
129 | unsigned char *tpkt; | |
130 | int tpktlen; | |
131 | int tpktoff; | |
132 | ||
133 | /* Get TCP header */ | |
3db05fea | 134 | th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph); |
f587de0e PM |
135 | if (th == NULL) |
136 | return 0; | |
137 | ||
138 | /* Get TCP data offset */ | |
139 | tcpdataoff = protoff + th->doff * 4; | |
140 | ||
141 | /* Get TCP data length */ | |
3db05fea | 142 | tcpdatalen = skb->len - tcpdataoff; |
f587de0e PM |
143 | if (tcpdatalen <= 0) /* No TCP data */ |
144 | goto clear_out; | |
145 | ||
146 | if (*data == NULL) { /* first TPKT */ | |
147 | /* Get first TPKT pointer */ | |
3db05fea | 148 | tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen, |
f587de0e PM |
149 | h323_buffer); |
150 | BUG_ON(tpkt == NULL); | |
151 | ||
152 | /* Validate TPKT identifier */ | |
153 | if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) { | |
154 | /* Netmeeting sends TPKT header and data separately */ | |
155 | if (info->tpkt_len[dir] > 0) { | |
0d53778e PM |
156 | pr_debug("nf_ct_h323: previous packet " |
157 | "indicated separate TPKT data of %hu " | |
158 | "bytes\n", info->tpkt_len[dir]); | |
f587de0e PM |
159 | if (info->tpkt_len[dir] <= tcpdatalen) { |
160 | /* Yes, there was a TPKT header | |
161 | * received */ | |
162 | *data = tpkt; | |
163 | *datalen = info->tpkt_len[dir]; | |
164 | *dataoff = 0; | |
165 | goto out; | |
166 | } | |
167 | ||
168 | /* Fragmented TPKT */ | |
0d53778e | 169 | pr_debug("nf_ct_h323: fragmented TPKT\n"); |
f587de0e PM |
170 | goto clear_out; |
171 | } | |
172 | ||
173 | /* It is not even a TPKT */ | |
174 | return 0; | |
175 | } | |
176 | tpktoff = 0; | |
177 | } else { /* Next TPKT */ | |
178 | tpktoff = *dataoff + *datalen; | |
179 | tcpdatalen -= tpktoff; | |
180 | if (tcpdatalen <= 4) /* No more TPKT */ | |
181 | goto clear_out; | |
182 | tpkt = *data + *datalen; | |
183 | ||
184 | /* Validate TPKT identifier */ | |
185 | if (tpkt[0] != 0x03 || tpkt[1] != 0) | |
186 | goto clear_out; | |
187 | } | |
188 | ||
189 | /* Validate TPKT length */ | |
190 | tpktlen = tpkt[2] * 256 + tpkt[3]; | |
191 | if (tpktlen < 4) | |
192 | goto clear_out; | |
193 | if (tpktlen > tcpdatalen) { | |
194 | if (tcpdatalen == 4) { /* Separate TPKT header */ | |
195 | /* Netmeeting sends TPKT header and data separately */ | |
0d53778e PM |
196 | pr_debug("nf_ct_h323: separate TPKT header indicates " |
197 | "there will be TPKT data of %hu bytes\n", | |
198 | tpktlen - 4); | |
f587de0e PM |
199 | info->tpkt_len[dir] = tpktlen - 4; |
200 | return 0; | |
201 | } | |
202 | ||
e772c349 | 203 | pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n"); |
f587de0e PM |
204 | goto clear_out; |
205 | } | |
206 | ||
207 | /* This is the encapsulated data */ | |
208 | *data = tpkt + 4; | |
209 | *datalen = tpktlen - 4; | |
210 | *dataoff = tpktoff + 4; | |
211 | ||
212 | out: | |
213 | /* Clear TPKT length */ | |
214 | info->tpkt_len[dir] = 0; | |
215 | return 1; | |
216 | ||
217 | clear_out: | |
218 | info->tpkt_len[dir] = 0; | |
219 | return 0; | |
220 | } | |
221 | ||
222 | /****************************************************************************/ | |
905e3e8e | 223 | static int get_h245_addr(struct nf_conn *ct, const unsigned char *data, |
f587de0e | 224 | H245_TransportAddress *taddr, |
643a2c15 | 225 | union nf_inet_addr *addr, __be16 *port) |
f587de0e | 226 | { |
905e3e8e | 227 | const unsigned char *p; |
f587de0e PM |
228 | int len; |
229 | ||
230 | if (taddr->choice != eH245_TransportAddress_unicastAddress) | |
231 | return 0; | |
232 | ||
233 | switch (taddr->unicastAddress.choice) { | |
234 | case eUnicastAddress_iPAddress: | |
5e8fbe2a | 235 | if (nf_ct_l3num(ct) != AF_INET) |
f587de0e PM |
236 | return 0; |
237 | p = data + taddr->unicastAddress.iPAddress.network; | |
238 | len = 4; | |
239 | break; | |
240 | case eUnicastAddress_iP6Address: | |
5e8fbe2a | 241 | if (nf_ct_l3num(ct) != AF_INET6) |
f587de0e PM |
242 | return 0; |
243 | p = data + taddr->unicastAddress.iP6Address.network; | |
244 | len = 16; | |
245 | break; | |
246 | default: | |
247 | return 0; | |
248 | } | |
249 | ||
250 | memcpy(addr, p, len); | |
251 | memset((void *)addr + len, 0, sizeof(*addr) - len); | |
252 | memcpy(port, p + len, sizeof(__be16)); | |
253 | ||
254 | return 1; | |
255 | } | |
256 | ||
257 | /****************************************************************************/ | |
3db05fea | 258 | static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 259 | enum ip_conntrack_info ctinfo, |
051966c0 | 260 | unsigned int protoff, |
f587de0e PM |
261 | unsigned char **data, int dataoff, |
262 | H245_TransportAddress *taddr) | |
263 | { | |
264 | int dir = CTINFO2DIR(ctinfo); | |
265 | int ret = 0; | |
266 | __be16 port; | |
267 | __be16 rtp_port, rtcp_port; | |
643a2c15 | 268 | union nf_inet_addr addr; |
f587de0e PM |
269 | struct nf_conntrack_expect *rtp_exp; |
270 | struct nf_conntrack_expect *rtcp_exp; | |
271 | typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp; | |
272 | ||
273 | /* Read RTP or RTCP address */ | |
274 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || | |
275 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
276 | port == 0) | |
277 | return 0; | |
278 | ||
279 | /* RTP port is even */ | |
d109e9af PNA |
280 | rtp_port = port & ~htons(1); |
281 | rtcp_port = port | htons(1); | |
f587de0e PM |
282 | |
283 | /* Create expect for RTP */ | |
6823645d | 284 | if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 285 | return -1; |
5e8fbe2a | 286 | nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
287 | &ct->tuplehash[!dir].tuple.src.u3, |
288 | &ct->tuplehash[!dir].tuple.dst.u3, | |
289 | IPPROTO_UDP, NULL, &rtp_port); | |
f587de0e PM |
290 | |
291 | /* Create expect for RTCP */ | |
6823645d PM |
292 | if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) { |
293 | nf_ct_expect_put(rtp_exp); | |
f587de0e PM |
294 | return -1; |
295 | } | |
5e8fbe2a | 296 | nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
297 | &ct->tuplehash[!dir].tuple.src.u3, |
298 | &ct->tuplehash[!dir].tuple.dst.u3, | |
299 | IPPROTO_UDP, NULL, &rtcp_port); | |
f587de0e PM |
300 | |
301 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
601e68e1 | 302 | &ct->tuplehash[!dir].tuple.dst.u3, |
f587de0e PM |
303 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
304 | (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) && | |
811927cc | 305 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
f587de0e PM |
306 | ct->status & IPS_NAT_MASK) { |
307 | /* NAT needed */ | |
051966c0 | 308 | ret = nat_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
309 | taddr, port, rtp_port, rtp_exp, rtcp_exp); |
310 | } else { /* Conntrack only */ | |
6823645d PM |
311 | if (nf_ct_expect_related(rtp_exp) == 0) { |
312 | if (nf_ct_expect_related(rtcp_exp) == 0) { | |
0d53778e | 313 | pr_debug("nf_ct_h323: expect RTP "); |
3c9fba65 | 314 | nf_ct_dump_tuple(&rtp_exp->tuple); |
0d53778e | 315 | pr_debug("nf_ct_h323: expect RTCP "); |
3c9fba65 | 316 | nf_ct_dump_tuple(&rtcp_exp->tuple); |
f587de0e | 317 | } else { |
6823645d | 318 | nf_ct_unexpect_related(rtp_exp); |
f587de0e PM |
319 | ret = -1; |
320 | } | |
321 | } else | |
322 | ret = -1; | |
323 | } | |
324 | ||
6823645d PM |
325 | nf_ct_expect_put(rtp_exp); |
326 | nf_ct_expect_put(rtcp_exp); | |
f587de0e PM |
327 | |
328 | return ret; | |
329 | } | |
330 | ||
331 | /****************************************************************************/ | |
3db05fea | 332 | static int expect_t120(struct sk_buff *skb, |
f587de0e PM |
333 | struct nf_conn *ct, |
334 | enum ip_conntrack_info ctinfo, | |
051966c0 | 335 | unsigned int protoff, |
f587de0e PM |
336 | unsigned char **data, int dataoff, |
337 | H245_TransportAddress *taddr) | |
338 | { | |
339 | int dir = CTINFO2DIR(ctinfo); | |
340 | int ret = 0; | |
341 | __be16 port; | |
643a2c15 | 342 | union nf_inet_addr addr; |
f587de0e PM |
343 | struct nf_conntrack_expect *exp; |
344 | typeof(nat_t120_hook) nat_t120; | |
345 | ||
346 | /* Read T.120 address */ | |
347 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || | |
348 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
349 | port == 0) | |
350 | return 0; | |
351 | ||
352 | /* Create expect for T.120 connections */ | |
6823645d | 353 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 354 | return -1; |
5e8fbe2a | 355 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
356 | &ct->tuplehash[!dir].tuple.src.u3, |
357 | &ct->tuplehash[!dir].tuple.dst.u3, | |
358 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
359 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */ |
360 | ||
361 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
362 | &ct->tuplehash[!dir].tuple.dst.u3, | |
363 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
364 | (nat_t120 = rcu_dereference(nat_t120_hook)) && | |
811927cc | 365 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
f587de0e PM |
366 | ct->status & IPS_NAT_MASK) { |
367 | /* NAT needed */ | |
051966c0 | 368 | ret = nat_t120(skb, ct, ctinfo, protoff, data, dataoff, taddr, |
f587de0e PM |
369 | port, exp); |
370 | } else { /* Conntrack only */ | |
6823645d | 371 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 372 | pr_debug("nf_ct_h323: expect T.120 "); |
3c9fba65 | 373 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
374 | } else |
375 | ret = -1; | |
376 | } | |
377 | ||
6823645d | 378 | nf_ct_expect_put(exp); |
f587de0e PM |
379 | |
380 | return ret; | |
381 | } | |
382 | ||
383 | /****************************************************************************/ | |
3db05fea | 384 | static int process_h245_channel(struct sk_buff *skb, |
f587de0e PM |
385 | struct nf_conn *ct, |
386 | enum ip_conntrack_info ctinfo, | |
051966c0 | 387 | unsigned int protoff, |
f587de0e PM |
388 | unsigned char **data, int dataoff, |
389 | H2250LogicalChannelParameters *channel) | |
390 | { | |
391 | int ret; | |
392 | ||
393 | if (channel->options & eH2250LogicalChannelParameters_mediaChannel) { | |
394 | /* RTP */ | |
051966c0 | 395 | ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
396 | &channel->mediaChannel); |
397 | if (ret < 0) | |
398 | return -1; | |
399 | } | |
400 | ||
401 | if (channel-> | |
402 | options & eH2250LogicalChannelParameters_mediaControlChannel) { | |
403 | /* RTCP */ | |
051966c0 | 404 | ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
405 | &channel->mediaControlChannel); |
406 | if (ret < 0) | |
407 | return -1; | |
408 | } | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
413 | /****************************************************************************/ | |
3db05fea | 414 | static int process_olc(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 415 | enum ip_conntrack_info ctinfo, |
051966c0 | 416 | unsigned int protoff, |
f587de0e PM |
417 | unsigned char **data, int dataoff, |
418 | OpenLogicalChannel *olc) | |
419 | { | |
420 | int ret; | |
421 | ||
0d53778e | 422 | pr_debug("nf_ct_h323: OpenLogicalChannel\n"); |
f587de0e PM |
423 | |
424 | if (olc->forwardLogicalChannelParameters.multiplexParameters.choice == | |
425 | eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters) | |
426 | { | |
051966c0 PM |
427 | ret = process_h245_channel(skb, ct, ctinfo, |
428 | protoff, data, dataoff, | |
f587de0e PM |
429 | &olc-> |
430 | forwardLogicalChannelParameters. | |
431 | multiplexParameters. | |
432 | h2250LogicalChannelParameters); | |
433 | if (ret < 0) | |
434 | return -1; | |
435 | } | |
436 | ||
437 | if ((olc->options & | |
438 | eOpenLogicalChannel_reverseLogicalChannelParameters) && | |
439 | (olc->reverseLogicalChannelParameters.options & | |
440 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters) | |
441 | && (olc->reverseLogicalChannelParameters.multiplexParameters. | |
442 | choice == | |
443 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) | |
444 | { | |
445 | ret = | |
051966c0 PM |
446 | process_h245_channel(skb, ct, ctinfo, |
447 | protoff, data, dataoff, | |
f587de0e PM |
448 | &olc-> |
449 | reverseLogicalChannelParameters. | |
450 | multiplexParameters. | |
451 | h2250LogicalChannelParameters); | |
452 | if (ret < 0) | |
453 | return -1; | |
454 | } | |
455 | ||
456 | if ((olc->options & eOpenLogicalChannel_separateStack) && | |
457 | olc->forwardLogicalChannelParameters.dataType.choice == | |
458 | eDataType_data && | |
459 | olc->forwardLogicalChannelParameters.dataType.data.application. | |
460 | choice == eDataApplicationCapability_application_t120 && | |
461 | olc->forwardLogicalChannelParameters.dataType.data.application. | |
462 | t120.choice == eDataProtocolCapability_separateLANStack && | |
463 | olc->separateStack.networkAddress.choice == | |
464 | eNetworkAccessParameters_networkAddress_localAreaAddress) { | |
051966c0 | 465 | ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
466 | &olc->separateStack.networkAddress. |
467 | localAreaAddress); | |
468 | if (ret < 0) | |
469 | return -1; | |
470 | } | |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
475 | /****************************************************************************/ | |
3db05fea | 476 | static int process_olca(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 477 | enum ip_conntrack_info ctinfo, |
051966c0 | 478 | unsigned int protoff, unsigned char **data, int dataoff, |
f587de0e PM |
479 | OpenLogicalChannelAck *olca) |
480 | { | |
481 | H2250LogicalChannelAckParameters *ack; | |
482 | int ret; | |
483 | ||
0d53778e | 484 | pr_debug("nf_ct_h323: OpenLogicalChannelAck\n"); |
f587de0e PM |
485 | |
486 | if ((olca->options & | |
487 | eOpenLogicalChannelAck_reverseLogicalChannelParameters) && | |
488 | (olca->reverseLogicalChannelParameters.options & | |
489 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters) | |
490 | && (olca->reverseLogicalChannelParameters.multiplexParameters. | |
491 | choice == | |
492 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) | |
493 | { | |
051966c0 PM |
494 | ret = process_h245_channel(skb, ct, ctinfo, |
495 | protoff, data, dataoff, | |
f587de0e PM |
496 | &olca-> |
497 | reverseLogicalChannelParameters. | |
498 | multiplexParameters. | |
499 | h2250LogicalChannelParameters); | |
500 | if (ret < 0) | |
501 | return -1; | |
502 | } | |
503 | ||
504 | if ((olca->options & | |
505 | eOpenLogicalChannelAck_forwardMultiplexAckParameters) && | |
506 | (olca->forwardMultiplexAckParameters.choice == | |
507 | eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters)) | |
508 | { | |
509 | ack = &olca->forwardMultiplexAckParameters. | |
510 | h2250LogicalChannelAckParameters; | |
511 | if (ack->options & | |
512 | eH2250LogicalChannelAckParameters_mediaChannel) { | |
513 | /* RTP */ | |
051966c0 PM |
514 | ret = expect_rtp_rtcp(skb, ct, ctinfo, |
515 | protoff, data, dataoff, | |
f587de0e PM |
516 | &ack->mediaChannel); |
517 | if (ret < 0) | |
518 | return -1; | |
519 | } | |
520 | ||
521 | if (ack->options & | |
522 | eH2250LogicalChannelAckParameters_mediaControlChannel) { | |
523 | /* RTCP */ | |
051966c0 PM |
524 | ret = expect_rtp_rtcp(skb, ct, ctinfo, |
525 | protoff, data, dataoff, | |
f587de0e PM |
526 | &ack->mediaControlChannel); |
527 | if (ret < 0) | |
528 | return -1; | |
529 | } | |
530 | } | |
531 | ||
f8f1c08e JMZ |
532 | if ((olca->options & eOpenLogicalChannelAck_separateStack) && |
533 | olca->separateStack.networkAddress.choice == | |
534 | eNetworkAccessParameters_networkAddress_localAreaAddress) { | |
051966c0 | 535 | ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff, |
f8f1c08e JMZ |
536 | &olca->separateStack.networkAddress. |
537 | localAreaAddress); | |
538 | if (ret < 0) | |
539 | return -1; | |
540 | } | |
541 | ||
f587de0e PM |
542 | return 0; |
543 | } | |
544 | ||
545 | /****************************************************************************/ | |
3db05fea | 546 | static int process_h245(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 547 | enum ip_conntrack_info ctinfo, |
051966c0 | 548 | unsigned int protoff, unsigned char **data, int dataoff, |
f587de0e PM |
549 | MultimediaSystemControlMessage *mscm) |
550 | { | |
551 | switch (mscm->choice) { | |
552 | case eMultimediaSystemControlMessage_request: | |
553 | if (mscm->request.choice == | |
554 | eRequestMessage_openLogicalChannel) { | |
051966c0 PM |
555 | return process_olc(skb, ct, ctinfo, |
556 | protoff, data, dataoff, | |
f587de0e PM |
557 | &mscm->request.openLogicalChannel); |
558 | } | |
0d53778e PM |
559 | pr_debug("nf_ct_h323: H.245 Request %d\n", |
560 | mscm->request.choice); | |
f587de0e PM |
561 | break; |
562 | case eMultimediaSystemControlMessage_response: | |
563 | if (mscm->response.choice == | |
564 | eResponseMessage_openLogicalChannelAck) { | |
051966c0 PM |
565 | return process_olca(skb, ct, ctinfo, |
566 | protoff, data, dataoff, | |
f587de0e PM |
567 | &mscm->response. |
568 | openLogicalChannelAck); | |
569 | } | |
0d53778e PM |
570 | pr_debug("nf_ct_h323: H.245 Response %d\n", |
571 | mscm->response.choice); | |
f587de0e PM |
572 | break; |
573 | default: | |
0d53778e | 574 | pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice); |
f587de0e PM |
575 | break; |
576 | } | |
577 | ||
578 | return 0; | |
579 | } | |
580 | ||
581 | /****************************************************************************/ | |
3db05fea | 582 | static int h245_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
583 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
584 | { | |
585 | static MultimediaSystemControlMessage mscm; | |
586 | unsigned char *data = NULL; | |
587 | int datalen; | |
588 | int dataoff; | |
589 | int ret; | |
590 | ||
591 | /* Until there's been traffic both ways, don't look in packets. */ | |
fb048833 | 592 | if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) |
f587de0e | 593 | return NF_ACCEPT; |
fb048833 | 594 | |
3db05fea | 595 | pr_debug("nf_ct_h245: skblen = %u\n", skb->len); |
f587de0e PM |
596 | |
597 | spin_lock_bh(&nf_h323_lock); | |
598 | ||
599 | /* Process each TPKT */ | |
3db05fea | 600 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
f587de0e | 601 | &data, &datalen, &dataoff)) { |
0d53778e | 602 | pr_debug("nf_ct_h245: TPKT len=%d ", datalen); |
3c9fba65 | 603 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
f587de0e PM |
604 | |
605 | /* Decode H.245 signal */ | |
606 | ret = DecodeMultimediaSystemControlMessage(data, datalen, | |
607 | &mscm); | |
608 | if (ret < 0) { | |
0d53778e PM |
609 | pr_debug("nf_ct_h245: decoding error: %s\n", |
610 | ret == H323_ERROR_BOUND ? | |
611 | "out of bound" : "out of range"); | |
f587de0e PM |
612 | /* We don't drop when decoding error */ |
613 | break; | |
614 | } | |
615 | ||
616 | /* Process H.245 signal */ | |
051966c0 PM |
617 | if (process_h245(skb, ct, ctinfo, protoff, |
618 | &data, dataoff, &mscm) < 0) | |
f587de0e PM |
619 | goto drop; |
620 | } | |
621 | ||
622 | spin_unlock_bh(&nf_h323_lock); | |
623 | return NF_ACCEPT; | |
624 | ||
625 | drop: | |
626 | spin_unlock_bh(&nf_h323_lock); | |
b20ab9cc | 627 | nf_ct_helper_log(skb, ct, "cannot process H.245 message"); |
f587de0e PM |
628 | return NF_DROP; |
629 | } | |
630 | ||
631 | /****************************************************************************/ | |
6002f266 PM |
632 | static const struct nf_conntrack_expect_policy h245_exp_policy = { |
633 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */, | |
634 | .timeout = 240, | |
635 | }; | |
636 | ||
f587de0e PM |
637 | static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { |
638 | .name = "H.245", | |
639 | .me = THIS_MODULE, | |
a56b8f81 | 640 | .tuple.src.l3num = AF_UNSPEC, |
f587de0e | 641 | .tuple.dst.protonum = IPPROTO_UDP, |
6002f266 PM |
642 | .help = h245_help, |
643 | .expect_policy = &h245_exp_policy, | |
f587de0e PM |
644 | }; |
645 | ||
646 | /****************************************************************************/ | |
647 | int get_h225_addr(struct nf_conn *ct, unsigned char *data, | |
648 | TransportAddress *taddr, | |
643a2c15 | 649 | union nf_inet_addr *addr, __be16 *port) |
f587de0e | 650 | { |
905e3e8e | 651 | const unsigned char *p; |
f587de0e PM |
652 | int len; |
653 | ||
654 | switch (taddr->choice) { | |
655 | case eTransportAddress_ipAddress: | |
5e8fbe2a | 656 | if (nf_ct_l3num(ct) != AF_INET) |
f587de0e PM |
657 | return 0; |
658 | p = data + taddr->ipAddress.ip; | |
659 | len = 4; | |
660 | break; | |
661 | case eTransportAddress_ip6Address: | |
5e8fbe2a | 662 | if (nf_ct_l3num(ct) != AF_INET6) |
f587de0e | 663 | return 0; |
bb807245 | 664 | p = data + taddr->ip6Address.ip; |
f587de0e PM |
665 | len = 16; |
666 | break; | |
667 | default: | |
668 | return 0; | |
669 | } | |
670 | ||
671 | memcpy(addr, p, len); | |
672 | memset((void *)addr + len, 0, sizeof(*addr) - len); | |
673 | memcpy(port, p + len, sizeof(__be16)); | |
674 | ||
675 | return 1; | |
676 | } | |
677 | ||
678 | /****************************************************************************/ | |
3db05fea | 679 | static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 680 | enum ip_conntrack_info ctinfo, |
051966c0 | 681 | unsigned int protoff, unsigned char **data, int dataoff, |
f587de0e PM |
682 | TransportAddress *taddr) |
683 | { | |
684 | int dir = CTINFO2DIR(ctinfo); | |
685 | int ret = 0; | |
686 | __be16 port; | |
643a2c15 | 687 | union nf_inet_addr addr; |
f587de0e PM |
688 | struct nf_conntrack_expect *exp; |
689 | typeof(nat_h245_hook) nat_h245; | |
690 | ||
691 | /* Read h245Address */ | |
692 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || | |
693 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
694 | port == 0) | |
695 | return 0; | |
696 | ||
697 | /* Create expect for h245 connection */ | |
6823645d | 698 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 699 | return -1; |
5e8fbe2a | 700 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
701 | &ct->tuplehash[!dir].tuple.src.u3, |
702 | &ct->tuplehash[!dir].tuple.dst.u3, | |
703 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
704 | exp->helper = &nf_conntrack_helper_h245; |
705 | ||
706 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
707 | &ct->tuplehash[!dir].tuple.dst.u3, | |
708 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
709 | (nat_h245 = rcu_dereference(nat_h245_hook)) && | |
811927cc | 710 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
f587de0e PM |
711 | ct->status & IPS_NAT_MASK) { |
712 | /* NAT needed */ | |
051966c0 | 713 | ret = nat_h245(skb, ct, ctinfo, protoff, data, dataoff, taddr, |
f587de0e PM |
714 | port, exp); |
715 | } else { /* Conntrack only */ | |
6823645d | 716 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 717 | pr_debug("nf_ct_q931: expect H.245 "); |
3c9fba65 | 718 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
719 | } else |
720 | ret = -1; | |
721 | } | |
722 | ||
6823645d | 723 | nf_ct_expect_put(exp); |
f587de0e PM |
724 | |
725 | return ret; | |
726 | } | |
727 | ||
728 | /* If the calling party is on the same side of the forward-to party, | |
729 | * we don't need to track the second call */ | |
2c7b5d5d VA |
730 | static int callforward_do_filter(struct net *net, |
731 | const union nf_inet_addr *src, | |
76108cea JE |
732 | const union nf_inet_addr *dst, |
733 | u_int8_t family) | |
f587de0e | 734 | { |
1e796fda | 735 | const struct nf_afinfo *afinfo; |
f587de0e PM |
736 | int ret = 0; |
737 | ||
e2361cb9 | 738 | /* rcu_read_lock()ed by nf_hook_thresh */ |
1841a4c7 PM |
739 | afinfo = nf_get_afinfo(family); |
740 | if (!afinfo) | |
741 | return 0; | |
742 | ||
f587de0e PM |
743 | switch (family) { |
744 | case AF_INET: { | |
5a49d0e0 | 745 | struct flowi4 fl1, fl2; |
f587de0e PM |
746 | struct rtable *rt1, *rt2; |
747 | ||
5a49d0e0 DM |
748 | memset(&fl1, 0, sizeof(fl1)); |
749 | fl1.daddr = src->ip; | |
750 | ||
751 | memset(&fl2, 0, sizeof(fl2)); | |
752 | fl2.daddr = dst->ip; | |
2c7b5d5d | 753 | if (!afinfo->route(net, (struct dst_entry **)&rt1, |
0fae2e77 | 754 | flowi4_to_flowi(&fl1), false)) { |
2c7b5d5d | 755 | if (!afinfo->route(net, (struct dst_entry **)&rt2, |
0fae2e77 | 756 | flowi4_to_flowi(&fl2), false)) { |
bbb5823c JA |
757 | if (rt_nexthop(rt1, fl1.daddr) == |
758 | rt_nexthop(rt2, fl2.daddr) && | |
d8d1f30b | 759 | rt1->dst.dev == rt2->dst.dev) |
f587de0e | 760 | ret = 1; |
d8d1f30b | 761 | dst_release(&rt2->dst); |
f587de0e | 762 | } |
d8d1f30b | 763 | dst_release(&rt1->dst); |
f587de0e PM |
764 | } |
765 | break; | |
766 | } | |
c0cd1156 | 767 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6) |
f587de0e | 768 | case AF_INET6: { |
5a49d0e0 | 769 | struct flowi6 fl1, fl2; |
f587de0e PM |
770 | struct rt6_info *rt1, *rt2; |
771 | ||
5a49d0e0 | 772 | memset(&fl1, 0, sizeof(fl1)); |
4e3fd7a0 | 773 | fl1.daddr = src->in6; |
5a49d0e0 DM |
774 | |
775 | memset(&fl2, 0, sizeof(fl2)); | |
4e3fd7a0 | 776 | fl2.daddr = dst->in6; |
2c7b5d5d | 777 | if (!afinfo->route(net, (struct dst_entry **)&rt1, |
0fae2e77 | 778 | flowi6_to_flowi(&fl1), false)) { |
2c7b5d5d | 779 | if (!afinfo->route(net, (struct dst_entry **)&rt2, |
0fae2e77 | 780 | flowi6_to_flowi(&fl2), false)) { |
2647a9b0 MKL |
781 | if (ipv6_addr_equal(rt6_nexthop(rt1, &fl1.daddr), |
782 | rt6_nexthop(rt2, &fl2.daddr)) && | |
d8d1f30b | 783 | rt1->dst.dev == rt2->dst.dev) |
f587de0e | 784 | ret = 1; |
d8d1f30b | 785 | dst_release(&rt2->dst); |
f587de0e | 786 | } |
d8d1f30b | 787 | dst_release(&rt1->dst); |
f587de0e PM |
788 | } |
789 | break; | |
790 | } | |
791 | #endif | |
792 | } | |
793 | return ret; | |
794 | ||
795 | } | |
796 | ||
797 | /****************************************************************************/ | |
3db05fea | 798 | static int expect_callforwarding(struct sk_buff *skb, |
f587de0e PM |
799 | struct nf_conn *ct, |
800 | enum ip_conntrack_info ctinfo, | |
051966c0 | 801 | unsigned int protoff, |
f587de0e PM |
802 | unsigned char **data, int dataoff, |
803 | TransportAddress *taddr) | |
804 | { | |
805 | int dir = CTINFO2DIR(ctinfo); | |
806 | int ret = 0; | |
807 | __be16 port; | |
643a2c15 | 808 | union nf_inet_addr addr; |
f587de0e | 809 | struct nf_conntrack_expect *exp; |
2c7b5d5d | 810 | struct net *net = nf_ct_net(ct); |
f587de0e PM |
811 | typeof(nat_callforwarding_hook) nat_callforwarding; |
812 | ||
813 | /* Read alternativeAddress */ | |
814 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) | |
815 | return 0; | |
816 | ||
817 | /* If the calling party is on the same side of the forward-to party, | |
818 | * we don't need to track the second call */ | |
819 | if (callforward_filter && | |
2c7b5d5d | 820 | callforward_do_filter(net, &addr, &ct->tuplehash[!dir].tuple.src.u3, |
5e8fbe2a | 821 | nf_ct_l3num(ct))) { |
0d53778e | 822 | pr_debug("nf_ct_q931: Call Forwarding not tracked\n"); |
f587de0e PM |
823 | return 0; |
824 | } | |
825 | ||
826 | /* Create expect for the second call leg */ | |
6823645d | 827 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 828 | return -1; |
5e8fbe2a | 829 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
830 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
831 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
832 | exp->helper = nf_conntrack_helper_q931; |
833 | ||
834 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
835 | &ct->tuplehash[!dir].tuple.dst.u3, | |
836 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
837 | (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && | |
811927cc | 838 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
f587de0e PM |
839 | ct->status & IPS_NAT_MASK) { |
840 | /* Need NAT */ | |
051966c0 PM |
841 | ret = nat_callforwarding(skb, ct, ctinfo, |
842 | protoff, data, dataoff, | |
f587de0e PM |
843 | taddr, port, exp); |
844 | } else { /* Conntrack only */ | |
6823645d | 845 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 846 | pr_debug("nf_ct_q931: expect Call Forwarding "); |
3c9fba65 | 847 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
848 | } else |
849 | ret = -1; | |
850 | } | |
851 | ||
6823645d | 852 | nf_ct_expect_put(exp); |
f587de0e PM |
853 | |
854 | return ret; | |
855 | } | |
856 | ||
857 | /****************************************************************************/ | |
3db05fea | 858 | static int process_setup(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 859 | enum ip_conntrack_info ctinfo, |
051966c0 | 860 | unsigned int protoff, |
f587de0e PM |
861 | unsigned char **data, int dataoff, |
862 | Setup_UUIE *setup) | |
863 | { | |
864 | int dir = CTINFO2DIR(ctinfo); | |
865 | int ret; | |
866 | int i; | |
867 | __be16 port; | |
643a2c15 | 868 | union nf_inet_addr addr; |
f587de0e PM |
869 | typeof(set_h225_addr_hook) set_h225_addr; |
870 | ||
0d53778e | 871 | pr_debug("nf_ct_q931: Setup\n"); |
f587de0e PM |
872 | |
873 | if (setup->options & eSetup_UUIE_h245Address) { | |
051966c0 | 874 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
875 | &setup->h245Address); |
876 | if (ret < 0) | |
877 | return -1; | |
878 | } | |
879 | ||
880 | set_h225_addr = rcu_dereference(set_h225_addr_hook); | |
881 | if ((setup->options & eSetup_UUIE_destCallSignalAddress) && | |
811927cc PM |
882 | (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
883 | ct->status & IPS_NAT_MASK && | |
f587de0e | 884 | get_h225_addr(ct, *data, &setup->destCallSignalAddress, |
601e68e1 | 885 | &addr, &port) && |
f587de0e | 886 | memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { |
5b095d98 | 887 | pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
38ff4fa4 | 888 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3, |
0d53778e | 889 | ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port)); |
051966c0 | 890 | ret = set_h225_addr(skb, protoff, data, dataoff, |
f587de0e PM |
891 | &setup->destCallSignalAddress, |
892 | &ct->tuplehash[!dir].tuple.src.u3, | |
893 | ct->tuplehash[!dir].tuple.src.u.tcp.port); | |
894 | if (ret < 0) | |
895 | return -1; | |
896 | } | |
897 | ||
898 | if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && | |
811927cc PM |
899 | (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
900 | ct->status & IPS_NAT_MASK && | |
f587de0e | 901 | get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, |
601e68e1 | 902 | &addr, &port) && |
f587de0e | 903 | memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { |
5b095d98 | 904 | pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
38ff4fa4 | 905 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3, |
0d53778e | 906 | ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); |
051966c0 | 907 | ret = set_h225_addr(skb, protoff, data, dataoff, |
f587de0e PM |
908 | &setup->sourceCallSignalAddress, |
909 | &ct->tuplehash[!dir].tuple.dst.u3, | |
910 | ct->tuplehash[!dir].tuple.dst.u.tcp.port); | |
911 | if (ret < 0) | |
912 | return -1; | |
913 | } | |
914 | ||
915 | if (setup->options & eSetup_UUIE_fastStart) { | |
916 | for (i = 0; i < setup->fastStart.count; i++) { | |
051966c0 PM |
917 | ret = process_olc(skb, ct, ctinfo, |
918 | protoff, data, dataoff, | |
f587de0e PM |
919 | &setup->fastStart.item[i]); |
920 | if (ret < 0) | |
921 | return -1; | |
922 | } | |
923 | } | |
924 | ||
925 | return 0; | |
926 | } | |
927 | ||
928 | /****************************************************************************/ | |
3db05fea | 929 | static int process_callproceeding(struct sk_buff *skb, |
f587de0e PM |
930 | struct nf_conn *ct, |
931 | enum ip_conntrack_info ctinfo, | |
051966c0 | 932 | unsigned int protoff, |
f587de0e PM |
933 | unsigned char **data, int dataoff, |
934 | CallProceeding_UUIE *callproc) | |
935 | { | |
936 | int ret; | |
937 | int i; | |
938 | ||
0d53778e | 939 | pr_debug("nf_ct_q931: CallProceeding\n"); |
f587de0e PM |
940 | |
941 | if (callproc->options & eCallProceeding_UUIE_h245Address) { | |
051966c0 | 942 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
943 | &callproc->h245Address); |
944 | if (ret < 0) | |
945 | return -1; | |
946 | } | |
947 | ||
948 | if (callproc->options & eCallProceeding_UUIE_fastStart) { | |
949 | for (i = 0; i < callproc->fastStart.count; i++) { | |
051966c0 PM |
950 | ret = process_olc(skb, ct, ctinfo, |
951 | protoff, data, dataoff, | |
f587de0e PM |
952 | &callproc->fastStart.item[i]); |
953 | if (ret < 0) | |
954 | return -1; | |
955 | } | |
956 | } | |
957 | ||
958 | return 0; | |
959 | } | |
960 | ||
961 | /****************************************************************************/ | |
3db05fea | 962 | static int process_connect(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 963 | enum ip_conntrack_info ctinfo, |
051966c0 | 964 | unsigned int protoff, |
f587de0e PM |
965 | unsigned char **data, int dataoff, |
966 | Connect_UUIE *connect) | |
967 | { | |
968 | int ret; | |
969 | int i; | |
970 | ||
0d53778e | 971 | pr_debug("nf_ct_q931: Connect\n"); |
f587de0e PM |
972 | |
973 | if (connect->options & eConnect_UUIE_h245Address) { | |
051966c0 | 974 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
975 | &connect->h245Address); |
976 | if (ret < 0) | |
977 | return -1; | |
978 | } | |
979 | ||
980 | if (connect->options & eConnect_UUIE_fastStart) { | |
981 | for (i = 0; i < connect->fastStart.count; i++) { | |
051966c0 PM |
982 | ret = process_olc(skb, ct, ctinfo, |
983 | protoff, data, dataoff, | |
f587de0e PM |
984 | &connect->fastStart.item[i]); |
985 | if (ret < 0) | |
986 | return -1; | |
987 | } | |
988 | } | |
989 | ||
990 | return 0; | |
991 | } | |
992 | ||
993 | /****************************************************************************/ | |
3db05fea | 994 | static int process_alerting(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 995 | enum ip_conntrack_info ctinfo, |
051966c0 | 996 | unsigned int protoff, |
f587de0e PM |
997 | unsigned char **data, int dataoff, |
998 | Alerting_UUIE *alert) | |
999 | { | |
1000 | int ret; | |
1001 | int i; | |
1002 | ||
0d53778e | 1003 | pr_debug("nf_ct_q931: Alerting\n"); |
f587de0e PM |
1004 | |
1005 | if (alert->options & eAlerting_UUIE_h245Address) { | |
051966c0 | 1006 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
1007 | &alert->h245Address); |
1008 | if (ret < 0) | |
1009 | return -1; | |
1010 | } | |
1011 | ||
1012 | if (alert->options & eAlerting_UUIE_fastStart) { | |
1013 | for (i = 0; i < alert->fastStart.count; i++) { | |
051966c0 PM |
1014 | ret = process_olc(skb, ct, ctinfo, |
1015 | protoff, data, dataoff, | |
f587de0e PM |
1016 | &alert->fastStart.item[i]); |
1017 | if (ret < 0) | |
1018 | return -1; | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | return 0; | |
1023 | } | |
1024 | ||
f587de0e | 1025 | /****************************************************************************/ |
3db05fea | 1026 | static int process_facility(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1027 | enum ip_conntrack_info ctinfo, |
051966c0 | 1028 | unsigned int protoff, |
f587de0e PM |
1029 | unsigned char **data, int dataoff, |
1030 | Facility_UUIE *facility) | |
1031 | { | |
1032 | int ret; | |
1033 | int i; | |
1034 | ||
0d53778e | 1035 | pr_debug("nf_ct_q931: Facility\n"); |
f587de0e PM |
1036 | |
1037 | if (facility->reason.choice == eFacilityReason_callForwarded) { | |
1038 | if (facility->options & eFacility_UUIE_alternativeAddress) | |
051966c0 PM |
1039 | return expect_callforwarding(skb, ct, ctinfo, |
1040 | protoff, data, dataoff, | |
f587de0e PM |
1041 | &facility-> |
1042 | alternativeAddress); | |
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | if (facility->options & eFacility_UUIE_h245Address) { | |
051966c0 | 1047 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
1048 | &facility->h245Address); |
1049 | if (ret < 0) | |
1050 | return -1; | |
1051 | } | |
1052 | ||
1053 | if (facility->options & eFacility_UUIE_fastStart) { | |
1054 | for (i = 0; i < facility->fastStart.count; i++) { | |
051966c0 PM |
1055 | ret = process_olc(skb, ct, ctinfo, |
1056 | protoff, data, dataoff, | |
f587de0e PM |
1057 | &facility->fastStart.item[i]); |
1058 | if (ret < 0) | |
1059 | return -1; | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | /****************************************************************************/ | |
3db05fea | 1067 | static int process_progress(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1068 | enum ip_conntrack_info ctinfo, |
051966c0 | 1069 | unsigned int protoff, |
f587de0e PM |
1070 | unsigned char **data, int dataoff, |
1071 | Progress_UUIE *progress) | |
1072 | { | |
1073 | int ret; | |
1074 | int i; | |
1075 | ||
0d53778e | 1076 | pr_debug("nf_ct_q931: Progress\n"); |
f587de0e PM |
1077 | |
1078 | if (progress->options & eProgress_UUIE_h245Address) { | |
051966c0 | 1079 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
1080 | &progress->h245Address); |
1081 | if (ret < 0) | |
1082 | return -1; | |
1083 | } | |
1084 | ||
1085 | if (progress->options & eProgress_UUIE_fastStart) { | |
1086 | for (i = 0; i < progress->fastStart.count; i++) { | |
051966c0 PM |
1087 | ret = process_olc(skb, ct, ctinfo, |
1088 | protoff, data, dataoff, | |
f587de0e PM |
1089 | &progress->fastStart.item[i]); |
1090 | if (ret < 0) | |
1091 | return -1; | |
1092 | } | |
1093 | } | |
1094 | ||
1095 | return 0; | |
1096 | } | |
1097 | ||
1098 | /****************************************************************************/ | |
3db05fea | 1099 | static int process_q931(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1100 | enum ip_conntrack_info ctinfo, |
051966c0 PM |
1101 | unsigned int protoff, unsigned char **data, int dataoff, |
1102 | Q931 *q931) | |
f587de0e PM |
1103 | { |
1104 | H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; | |
1105 | int i; | |
1106 | int ret = 0; | |
1107 | ||
1108 | switch (pdu->h323_message_body.choice) { | |
1109 | case eH323_UU_PDU_h323_message_body_setup: | |
051966c0 | 1110 | ret = process_setup(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
1111 | &pdu->h323_message_body.setup); |
1112 | break; | |
1113 | case eH323_UU_PDU_h323_message_body_callProceeding: | |
051966c0 PM |
1114 | ret = process_callproceeding(skb, ct, ctinfo, |
1115 | protoff, data, dataoff, | |
f587de0e PM |
1116 | &pdu->h323_message_body. |
1117 | callProceeding); | |
1118 | break; | |
1119 | case eH323_UU_PDU_h323_message_body_connect: | |
051966c0 | 1120 | ret = process_connect(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
1121 | &pdu->h323_message_body.connect); |
1122 | break; | |
1123 | case eH323_UU_PDU_h323_message_body_alerting: | |
051966c0 | 1124 | ret = process_alerting(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
1125 | &pdu->h323_message_body.alerting); |
1126 | break; | |
f587de0e | 1127 | case eH323_UU_PDU_h323_message_body_facility: |
051966c0 | 1128 | ret = process_facility(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
1129 | &pdu->h323_message_body.facility); |
1130 | break; | |
1131 | case eH323_UU_PDU_h323_message_body_progress: | |
051966c0 | 1132 | ret = process_progress(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
1133 | &pdu->h323_message_body.progress); |
1134 | break; | |
1135 | default: | |
0d53778e PM |
1136 | pr_debug("nf_ct_q931: Q.931 signal %d\n", |
1137 | pdu->h323_message_body.choice); | |
f587de0e PM |
1138 | break; |
1139 | } | |
1140 | ||
1141 | if (ret < 0) | |
1142 | return -1; | |
1143 | ||
1144 | if (pdu->options & eH323_UU_PDU_h245Control) { | |
1145 | for (i = 0; i < pdu->h245Control.count; i++) { | |
051966c0 PM |
1146 | ret = process_h245(skb, ct, ctinfo, |
1147 | protoff, data, dataoff, | |
f587de0e PM |
1148 | &pdu->h245Control.item[i]); |
1149 | if (ret < 0) | |
1150 | return -1; | |
1151 | } | |
1152 | } | |
1153 | ||
1154 | return 0; | |
1155 | } | |
1156 | ||
1157 | /****************************************************************************/ | |
3db05fea | 1158 | static int q931_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1159 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
1160 | { | |
1161 | static Q931 q931; | |
1162 | unsigned char *data = NULL; | |
1163 | int datalen; | |
1164 | int dataoff; | |
1165 | int ret; | |
1166 | ||
1167 | /* Until there's been traffic both ways, don't look in packets. */ | |
fb048833 | 1168 | if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) |
f587de0e | 1169 | return NF_ACCEPT; |
fb048833 | 1170 | |
3db05fea | 1171 | pr_debug("nf_ct_q931: skblen = %u\n", skb->len); |
f587de0e PM |
1172 | |
1173 | spin_lock_bh(&nf_h323_lock); | |
1174 | ||
1175 | /* Process each TPKT */ | |
3db05fea | 1176 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
f587de0e | 1177 | &data, &datalen, &dataoff)) { |
0d53778e | 1178 | pr_debug("nf_ct_q931: TPKT len=%d ", datalen); |
3c9fba65 | 1179 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
f587de0e PM |
1180 | |
1181 | /* Decode Q.931 signal */ | |
1182 | ret = DecodeQ931(data, datalen, &q931); | |
1183 | if (ret < 0) { | |
0d53778e PM |
1184 | pr_debug("nf_ct_q931: decoding error: %s\n", |
1185 | ret == H323_ERROR_BOUND ? | |
1186 | "out of bound" : "out of range"); | |
f587de0e PM |
1187 | /* We don't drop when decoding error */ |
1188 | break; | |
1189 | } | |
1190 | ||
1191 | /* Process Q.931 signal */ | |
051966c0 PM |
1192 | if (process_q931(skb, ct, ctinfo, protoff, |
1193 | &data, dataoff, &q931) < 0) | |
f587de0e PM |
1194 | goto drop; |
1195 | } | |
1196 | ||
1197 | spin_unlock_bh(&nf_h323_lock); | |
1198 | return NF_ACCEPT; | |
1199 | ||
1200 | drop: | |
1201 | spin_unlock_bh(&nf_h323_lock); | |
b20ab9cc | 1202 | nf_ct_helper_log(skb, ct, "cannot process Q.931 message"); |
f587de0e PM |
1203 | return NF_DROP; |
1204 | } | |
1205 | ||
1206 | /****************************************************************************/ | |
6002f266 PM |
1207 | static const struct nf_conntrack_expect_policy q931_exp_policy = { |
1208 | /* T.120 and H.245 */ | |
1209 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, | |
1210 | .timeout = 240, | |
1211 | }; | |
1212 | ||
f587de0e PM |
1213 | static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { |
1214 | { | |
1215 | .name = "Q.931", | |
1216 | .me = THIS_MODULE, | |
f587de0e | 1217 | .tuple.src.l3num = AF_INET, |
09640e63 | 1218 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
f587de0e | 1219 | .tuple.dst.protonum = IPPROTO_TCP, |
6002f266 PM |
1220 | .help = q931_help, |
1221 | .expect_policy = &q931_exp_policy, | |
f587de0e PM |
1222 | }, |
1223 | { | |
1224 | .name = "Q.931", | |
1225 | .me = THIS_MODULE, | |
f587de0e | 1226 | .tuple.src.l3num = AF_INET6, |
09640e63 | 1227 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
f587de0e | 1228 | .tuple.dst.protonum = IPPROTO_TCP, |
6002f266 PM |
1229 | .help = q931_help, |
1230 | .expect_policy = &q931_exp_policy, | |
f587de0e PM |
1231 | }, |
1232 | }; | |
1233 | ||
1234 | /****************************************************************************/ | |
3db05fea | 1235 | static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1236 | int *datalen) |
1237 | { | |
905e3e8e JE |
1238 | const struct udphdr *uh; |
1239 | struct udphdr _uh; | |
f587de0e PM |
1240 | int dataoff; |
1241 | ||
3db05fea | 1242 | uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh); |
f587de0e PM |
1243 | if (uh == NULL) |
1244 | return NULL; | |
1245 | dataoff = protoff + sizeof(_uh); | |
3db05fea | 1246 | if (dataoff >= skb->len) |
f587de0e | 1247 | return NULL; |
3db05fea HX |
1248 | *datalen = skb->len - dataoff; |
1249 | return skb_header_pointer(skb, dataoff, *datalen, h323_buffer); | |
f587de0e PM |
1250 | } |
1251 | ||
1252 | /****************************************************************************/ | |
1253 | static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, | |
643a2c15 | 1254 | union nf_inet_addr *addr, |
f587de0e PM |
1255 | __be16 port) |
1256 | { | |
84541cc1 | 1257 | struct net *net = nf_ct_net(ct); |
f587de0e PM |
1258 | struct nf_conntrack_expect *exp; |
1259 | struct nf_conntrack_tuple tuple; | |
1260 | ||
1261 | memset(&tuple.src.u3, 0, sizeof(tuple.src.u3)); | |
1262 | tuple.src.u.tcp.port = 0; | |
1263 | memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3)); | |
1264 | tuple.dst.u.tcp.port = port; | |
1265 | tuple.dst.protonum = IPPROTO_TCP; | |
1266 | ||
5d0aa2cc | 1267 | exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple); |
f587de0e PM |
1268 | if (exp && exp->master == ct) |
1269 | return exp; | |
1270 | return NULL; | |
1271 | } | |
1272 | ||
f587de0e | 1273 | /****************************************************************************/ |
3db05fea | 1274 | static int expect_q931(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1275 | enum ip_conntrack_info ctinfo, |
051966c0 | 1276 | unsigned int protoff, unsigned char **data, |
f587de0e PM |
1277 | TransportAddress *taddr, int count) |
1278 | { | |
1afc5679 | 1279 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
f587de0e PM |
1280 | int dir = CTINFO2DIR(ctinfo); |
1281 | int ret = 0; | |
1282 | int i; | |
1283 | __be16 port; | |
643a2c15 | 1284 | union nf_inet_addr addr; |
f587de0e PM |
1285 | struct nf_conntrack_expect *exp; |
1286 | typeof(nat_q931_hook) nat_q931; | |
1287 | ||
1288 | /* Look for the first related address */ | |
1289 | for (i = 0; i < count; i++) { | |
1290 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && | |
1291 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, | |
601e68e1 | 1292 | sizeof(addr)) == 0 && port != 0) |
f587de0e PM |
1293 | break; |
1294 | } | |
1295 | ||
1296 | if (i >= count) /* Not found */ | |
1297 | return 0; | |
1298 | ||
1299 | /* Create expect for Q.931 */ | |
6823645d | 1300 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1301 | return -1; |
5e8fbe2a | 1302 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
1303 | gkrouted_only ? /* only accept calls from GK? */ |
1304 | &ct->tuplehash[!dir].tuple.src.u3 : NULL, | |
1305 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1306 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1307 | exp->helper = nf_conntrack_helper_q931; |
1308 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ | |
1309 | ||
1310 | nat_q931 = rcu_dereference(nat_q931_hook); | |
811927cc PM |
1311 | if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1312 | ct->status & IPS_NAT_MASK) { /* Need NAT */ | |
051966c0 PM |
1313 | ret = nat_q931(skb, ct, ctinfo, protoff, data, |
1314 | taddr, i, port, exp); | |
f587de0e | 1315 | } else { /* Conntrack only */ |
6823645d | 1316 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1317 | pr_debug("nf_ct_ras: expect Q.931 "); |
3c9fba65 | 1318 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1319 | |
1320 | /* Save port for looking up expect in processing RCF */ | |
1321 | info->sig_port[dir] = port; | |
1322 | } else | |
1323 | ret = -1; | |
1324 | } | |
1325 | ||
6823645d | 1326 | nf_ct_expect_put(exp); |
f587de0e PM |
1327 | |
1328 | return ret; | |
1329 | } | |
1330 | ||
1331 | /****************************************************************************/ | |
3db05fea | 1332 | static int process_grq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1333 | enum ip_conntrack_info ctinfo, |
051966c0 | 1334 | unsigned int protoff, |
f587de0e PM |
1335 | unsigned char **data, GatekeeperRequest *grq) |
1336 | { | |
1337 | typeof(set_ras_addr_hook) set_ras_addr; | |
1338 | ||
0d53778e | 1339 | pr_debug("nf_ct_ras: GRQ\n"); |
f587de0e PM |
1340 | |
1341 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
811927cc PM |
1342 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1343 | ct->status & IPS_NAT_MASK) /* NATed */ | |
051966c0 | 1344 | return set_ras_addr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1345 | &grq->rasAddress, 1); |
1346 | return 0; | |
1347 | } | |
1348 | ||
1349 | /****************************************************************************/ | |
3db05fea | 1350 | static int process_gcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1351 | enum ip_conntrack_info ctinfo, |
051966c0 | 1352 | unsigned int protoff, |
f587de0e PM |
1353 | unsigned char **data, GatekeeperConfirm *gcf) |
1354 | { | |
1355 | int dir = CTINFO2DIR(ctinfo); | |
1356 | int ret = 0; | |
1357 | __be16 port; | |
643a2c15 | 1358 | union nf_inet_addr addr; |
f587de0e PM |
1359 | struct nf_conntrack_expect *exp; |
1360 | ||
0d53778e | 1361 | pr_debug("nf_ct_ras: GCF\n"); |
f587de0e PM |
1362 | |
1363 | if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) | |
1364 | return 0; | |
1365 | ||
1366 | /* Registration port is the same as discovery port */ | |
1367 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && | |
1368 | port == ct->tuplehash[dir].tuple.src.u.udp.port) | |
1369 | return 0; | |
1370 | ||
1371 | /* Avoid RAS expectation loops. A GCF is never expected. */ | |
1372 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) | |
1373 | return 0; | |
1374 | ||
1375 | /* Need new expect */ | |
6823645d | 1376 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1377 | return -1; |
5e8fbe2a | 1378 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
1379 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1380 | IPPROTO_UDP, NULL, &port); | |
f587de0e PM |
1381 | exp->helper = nf_conntrack_helper_ras; |
1382 | ||
6823645d | 1383 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1384 | pr_debug("nf_ct_ras: expect RAS "); |
3c9fba65 | 1385 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1386 | } else |
1387 | ret = -1; | |
1388 | ||
6823645d | 1389 | nf_ct_expect_put(exp); |
f587de0e PM |
1390 | |
1391 | return ret; | |
1392 | } | |
1393 | ||
1394 | /****************************************************************************/ | |
3db05fea | 1395 | static int process_rrq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1396 | enum ip_conntrack_info ctinfo, |
051966c0 | 1397 | unsigned int protoff, |
f587de0e PM |
1398 | unsigned char **data, RegistrationRequest *rrq) |
1399 | { | |
1afc5679 | 1400 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
f587de0e PM |
1401 | int ret; |
1402 | typeof(set_ras_addr_hook) set_ras_addr; | |
1403 | ||
0d53778e | 1404 | pr_debug("nf_ct_ras: RRQ\n"); |
f587de0e | 1405 | |
051966c0 | 1406 | ret = expect_q931(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1407 | rrq->callSignalAddress.item, |
1408 | rrq->callSignalAddress.count); | |
1409 | if (ret < 0) | |
1410 | return -1; | |
1411 | ||
1412 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
811927cc PM |
1413 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1414 | ct->status & IPS_NAT_MASK) { | |
051966c0 | 1415 | ret = set_ras_addr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1416 | rrq->rasAddress.item, |
1417 | rrq->rasAddress.count); | |
1418 | if (ret < 0) | |
1419 | return -1; | |
1420 | } | |
1421 | ||
1422 | if (rrq->options & eRegistrationRequest_timeToLive) { | |
0d53778e | 1423 | pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); |
f587de0e PM |
1424 | info->timeout = rrq->timeToLive; |
1425 | } else | |
1426 | info->timeout = default_rrq_ttl; | |
1427 | ||
1428 | return 0; | |
1429 | } | |
1430 | ||
1431 | /****************************************************************************/ | |
3db05fea | 1432 | static int process_rcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1433 | enum ip_conntrack_info ctinfo, |
051966c0 | 1434 | unsigned int protoff, |
f587de0e PM |
1435 | unsigned char **data, RegistrationConfirm *rcf) |
1436 | { | |
1afc5679 | 1437 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
f587de0e PM |
1438 | int dir = CTINFO2DIR(ctinfo); |
1439 | int ret; | |
1440 | struct nf_conntrack_expect *exp; | |
1441 | typeof(set_sig_addr_hook) set_sig_addr; | |
1442 | ||
0d53778e | 1443 | pr_debug("nf_ct_ras: RCF\n"); |
f587de0e PM |
1444 | |
1445 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
811927cc PM |
1446 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1447 | ct->status & IPS_NAT_MASK) { | |
051966c0 | 1448 | ret = set_sig_addr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1449 | rcf->callSignalAddress.item, |
1450 | rcf->callSignalAddress.count); | |
1451 | if (ret < 0) | |
1452 | return -1; | |
1453 | } | |
1454 | ||
1455 | if (rcf->options & eRegistrationConfirm_timeToLive) { | |
0d53778e | 1456 | pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); |
f587de0e PM |
1457 | info->timeout = rcf->timeToLive; |
1458 | } | |
1459 | ||
1460 | if (info->timeout > 0) { | |
0d53778e PM |
1461 | pr_debug("nf_ct_ras: set RAS connection timeout to " |
1462 | "%u seconds\n", info->timeout); | |
3db05fea | 1463 | nf_ct_refresh(ct, skb, info->timeout * HZ); |
f587de0e PM |
1464 | |
1465 | /* Set expect timeout */ | |
ca7433df | 1466 | spin_lock_bh(&nf_conntrack_expect_lock); |
f587de0e PM |
1467 | exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, |
1468 | info->sig_port[!dir]); | |
1469 | if (exp) { | |
0d53778e PM |
1470 | pr_debug("nf_ct_ras: set Q.931 expect " |
1471 | "timeout to %u seconds for", | |
1472 | info->timeout); | |
3c9fba65 | 1473 | nf_ct_dump_tuple(&exp->tuple); |
707e6835 LZ |
1474 | mod_timer_pending(&exp->timeout, |
1475 | jiffies + info->timeout * HZ); | |
f587de0e | 1476 | } |
ca7433df | 1477 | spin_unlock_bh(&nf_conntrack_expect_lock); |
f587de0e PM |
1478 | } |
1479 | ||
1480 | return 0; | |
1481 | } | |
1482 | ||
1483 | /****************************************************************************/ | |
3db05fea | 1484 | static int process_urq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1485 | enum ip_conntrack_info ctinfo, |
051966c0 | 1486 | unsigned int protoff, |
f587de0e PM |
1487 | unsigned char **data, UnregistrationRequest *urq) |
1488 | { | |
1afc5679 | 1489 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
f587de0e PM |
1490 | int dir = CTINFO2DIR(ctinfo); |
1491 | int ret; | |
1492 | typeof(set_sig_addr_hook) set_sig_addr; | |
1493 | ||
0d53778e | 1494 | pr_debug("nf_ct_ras: URQ\n"); |
f587de0e PM |
1495 | |
1496 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
811927cc PM |
1497 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1498 | ct->status & IPS_NAT_MASK) { | |
051966c0 | 1499 | ret = set_sig_addr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1500 | urq->callSignalAddress.item, |
1501 | urq->callSignalAddress.count); | |
1502 | if (ret < 0) | |
1503 | return -1; | |
1504 | } | |
1505 | ||
1506 | /* Clear old expect */ | |
1507 | nf_ct_remove_expectations(ct); | |
1508 | info->sig_port[dir] = 0; | |
1509 | info->sig_port[!dir] = 0; | |
1510 | ||
1511 | /* Give it 30 seconds for UCF or URJ */ | |
3db05fea | 1512 | nf_ct_refresh(ct, skb, 30 * HZ); |
f587de0e PM |
1513 | |
1514 | return 0; | |
1515 | } | |
1516 | ||
1517 | /****************************************************************************/ | |
3db05fea | 1518 | static int process_arq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1519 | enum ip_conntrack_info ctinfo, |
051966c0 | 1520 | unsigned int protoff, |
f587de0e PM |
1521 | unsigned char **data, AdmissionRequest *arq) |
1522 | { | |
1afc5679 | 1523 | const struct nf_ct_h323_master *info = nfct_help_data(ct); |
f587de0e PM |
1524 | int dir = CTINFO2DIR(ctinfo); |
1525 | __be16 port; | |
643a2c15 | 1526 | union nf_inet_addr addr; |
f587de0e PM |
1527 | typeof(set_h225_addr_hook) set_h225_addr; |
1528 | ||
0d53778e | 1529 | pr_debug("nf_ct_ras: ARQ\n"); |
f587de0e PM |
1530 | |
1531 | set_h225_addr = rcu_dereference(set_h225_addr_hook); | |
1532 | if ((arq->options & eAdmissionRequest_destCallSignalAddress) && | |
1533 | get_h225_addr(ct, *data, &arq->destCallSignalAddress, | |
601e68e1 | 1534 | &addr, &port) && |
f587de0e PM |
1535 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
1536 | port == info->sig_port[dir] && | |
811927cc | 1537 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
f587de0e PM |
1538 | set_h225_addr && ct->status & IPS_NAT_MASK) { |
1539 | /* Answering ARQ */ | |
051966c0 | 1540 | return set_h225_addr(skb, protoff, data, 0, |
f587de0e PM |
1541 | &arq->destCallSignalAddress, |
1542 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1543 | info->sig_port[!dir]); | |
1544 | } | |
1545 | ||
1546 | if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && | |
1547 | get_h225_addr(ct, *data, &arq->srcCallSignalAddress, | |
601e68e1 | 1548 | &addr, &port) && |
f587de0e | 1549 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
811927cc PM |
1550 | set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1551 | ct->status & IPS_NAT_MASK) { | |
f587de0e | 1552 | /* Calling ARQ */ |
051966c0 | 1553 | return set_h225_addr(skb, protoff, data, 0, |
f587de0e PM |
1554 | &arq->srcCallSignalAddress, |
1555 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1556 | port); | |
1557 | } | |
1558 | ||
1559 | return 0; | |
1560 | } | |
1561 | ||
1562 | /****************************************************************************/ | |
3db05fea | 1563 | static int process_acf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1564 | enum ip_conntrack_info ctinfo, |
051966c0 | 1565 | unsigned int protoff, |
f587de0e PM |
1566 | unsigned char **data, AdmissionConfirm *acf) |
1567 | { | |
1568 | int dir = CTINFO2DIR(ctinfo); | |
1569 | int ret = 0; | |
1570 | __be16 port; | |
643a2c15 | 1571 | union nf_inet_addr addr; |
f587de0e PM |
1572 | struct nf_conntrack_expect *exp; |
1573 | typeof(set_sig_addr_hook) set_sig_addr; | |
1574 | ||
0d53778e | 1575 | pr_debug("nf_ct_ras: ACF\n"); |
f587de0e PM |
1576 | |
1577 | if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, | |
1578 | &addr, &port)) | |
1579 | return 0; | |
1580 | ||
1581 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { | |
1582 | /* Answering ACF */ | |
1583 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
811927cc PM |
1584 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1585 | ct->status & IPS_NAT_MASK) | |
051966c0 | 1586 | return set_sig_addr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1587 | &acf->destCallSignalAddress, 1); |
1588 | return 0; | |
1589 | } | |
1590 | ||
1591 | /* Need new expect */ | |
6823645d | 1592 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1593 | return -1; |
5e8fbe2a | 1594 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
1595 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1596 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1597 | exp->flags = NF_CT_EXPECT_PERMANENT; |
1598 | exp->helper = nf_conntrack_helper_q931; | |
1599 | ||
6823645d | 1600 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1601 | pr_debug("nf_ct_ras: expect Q.931 "); |
3c9fba65 | 1602 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1603 | } else |
1604 | ret = -1; | |
1605 | ||
6823645d | 1606 | nf_ct_expect_put(exp); |
f587de0e PM |
1607 | |
1608 | return ret; | |
1609 | } | |
1610 | ||
1611 | /****************************************************************************/ | |
3db05fea | 1612 | static int process_lrq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1613 | enum ip_conntrack_info ctinfo, |
051966c0 | 1614 | unsigned int protoff, |
f587de0e PM |
1615 | unsigned char **data, LocationRequest *lrq) |
1616 | { | |
1617 | typeof(set_ras_addr_hook) set_ras_addr; | |
1618 | ||
0d53778e | 1619 | pr_debug("nf_ct_ras: LRQ\n"); |
f587de0e PM |
1620 | |
1621 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
811927cc PM |
1622 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1623 | ct->status & IPS_NAT_MASK) | |
051966c0 | 1624 | return set_ras_addr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1625 | &lrq->replyAddress, 1); |
1626 | return 0; | |
1627 | } | |
1628 | ||
1629 | /****************************************************************************/ | |
3db05fea | 1630 | static int process_lcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1631 | enum ip_conntrack_info ctinfo, |
051966c0 | 1632 | unsigned int protoff, |
f587de0e PM |
1633 | unsigned char **data, LocationConfirm *lcf) |
1634 | { | |
1635 | int dir = CTINFO2DIR(ctinfo); | |
1636 | int ret = 0; | |
1637 | __be16 port; | |
643a2c15 | 1638 | union nf_inet_addr addr; |
f587de0e PM |
1639 | struct nf_conntrack_expect *exp; |
1640 | ||
0d53778e | 1641 | pr_debug("nf_ct_ras: LCF\n"); |
f587de0e PM |
1642 | |
1643 | if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, | |
1644 | &addr, &port)) | |
1645 | return 0; | |
1646 | ||
1647 | /* Need new expect for call signal */ | |
6823645d | 1648 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1649 | return -1; |
5e8fbe2a | 1650 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
1651 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1652 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1653 | exp->flags = NF_CT_EXPECT_PERMANENT; |
1654 | exp->helper = nf_conntrack_helper_q931; | |
1655 | ||
6823645d | 1656 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1657 | pr_debug("nf_ct_ras: expect Q.931 "); |
3c9fba65 | 1658 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1659 | } else |
1660 | ret = -1; | |
1661 | ||
6823645d | 1662 | nf_ct_expect_put(exp); |
f587de0e PM |
1663 | |
1664 | /* Ignore rasAddress */ | |
1665 | ||
1666 | return ret; | |
1667 | } | |
1668 | ||
1669 | /****************************************************************************/ | |
3db05fea | 1670 | static int process_irr(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1671 | enum ip_conntrack_info ctinfo, |
051966c0 | 1672 | unsigned int protoff, |
f587de0e PM |
1673 | unsigned char **data, InfoRequestResponse *irr) |
1674 | { | |
1675 | int ret; | |
1676 | typeof(set_ras_addr_hook) set_ras_addr; | |
1677 | typeof(set_sig_addr_hook) set_sig_addr; | |
1678 | ||
0d53778e | 1679 | pr_debug("nf_ct_ras: IRR\n"); |
f587de0e PM |
1680 | |
1681 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
811927cc PM |
1682 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1683 | ct->status & IPS_NAT_MASK) { | |
051966c0 | 1684 | ret = set_ras_addr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1685 | &irr->rasAddress, 1); |
1686 | if (ret < 0) | |
1687 | return -1; | |
1688 | } | |
1689 | ||
1690 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
811927cc PM |
1691 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1692 | ct->status & IPS_NAT_MASK) { | |
051966c0 | 1693 | ret = set_sig_addr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1694 | irr->callSignalAddress.item, |
1695 | irr->callSignalAddress.count); | |
1696 | if (ret < 0) | |
1697 | return -1; | |
1698 | } | |
1699 | ||
1700 | return 0; | |
1701 | } | |
1702 | ||
1703 | /****************************************************************************/ | |
3db05fea | 1704 | static int process_ras(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1705 | enum ip_conntrack_info ctinfo, |
051966c0 | 1706 | unsigned int protoff, |
f587de0e PM |
1707 | unsigned char **data, RasMessage *ras) |
1708 | { | |
1709 | switch (ras->choice) { | |
1710 | case eRasMessage_gatekeeperRequest: | |
051966c0 | 1711 | return process_grq(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1712 | &ras->gatekeeperRequest); |
1713 | case eRasMessage_gatekeeperConfirm: | |
051966c0 | 1714 | return process_gcf(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1715 | &ras->gatekeeperConfirm); |
1716 | case eRasMessage_registrationRequest: | |
051966c0 | 1717 | return process_rrq(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1718 | &ras->registrationRequest); |
1719 | case eRasMessage_registrationConfirm: | |
051966c0 | 1720 | return process_rcf(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1721 | &ras->registrationConfirm); |
1722 | case eRasMessage_unregistrationRequest: | |
051966c0 | 1723 | return process_urq(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1724 | &ras->unregistrationRequest); |
1725 | case eRasMessage_admissionRequest: | |
051966c0 | 1726 | return process_arq(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1727 | &ras->admissionRequest); |
1728 | case eRasMessage_admissionConfirm: | |
051966c0 | 1729 | return process_acf(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1730 | &ras->admissionConfirm); |
1731 | case eRasMessage_locationRequest: | |
051966c0 | 1732 | return process_lrq(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1733 | &ras->locationRequest); |
1734 | case eRasMessage_locationConfirm: | |
051966c0 | 1735 | return process_lcf(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1736 | &ras->locationConfirm); |
1737 | case eRasMessage_infoRequestResponse: | |
051966c0 | 1738 | return process_irr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1739 | &ras->infoRequestResponse); |
1740 | default: | |
0d53778e | 1741 | pr_debug("nf_ct_ras: RAS message %d\n", ras->choice); |
f587de0e PM |
1742 | break; |
1743 | } | |
1744 | ||
1745 | return 0; | |
1746 | } | |
1747 | ||
1748 | /****************************************************************************/ | |
3db05fea | 1749 | static int ras_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1750 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
1751 | { | |
1752 | static RasMessage ras; | |
1753 | unsigned char *data; | |
1754 | int datalen = 0; | |
1755 | int ret; | |
1756 | ||
3db05fea | 1757 | pr_debug("nf_ct_ras: skblen = %u\n", skb->len); |
f587de0e PM |
1758 | |
1759 | spin_lock_bh(&nf_h323_lock); | |
1760 | ||
1761 | /* Get UDP data */ | |
3db05fea | 1762 | data = get_udp_data(skb, protoff, &datalen); |
f587de0e PM |
1763 | if (data == NULL) |
1764 | goto accept; | |
0d53778e | 1765 | pr_debug("nf_ct_ras: RAS message len=%d ", datalen); |
3c9fba65 | 1766 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
f587de0e PM |
1767 | |
1768 | /* Decode RAS message */ | |
1769 | ret = DecodeRasMessage(data, datalen, &ras); | |
1770 | if (ret < 0) { | |
0d53778e PM |
1771 | pr_debug("nf_ct_ras: decoding error: %s\n", |
1772 | ret == H323_ERROR_BOUND ? | |
1773 | "out of bound" : "out of range"); | |
f587de0e PM |
1774 | goto accept; |
1775 | } | |
1776 | ||
1777 | /* Process RAS message */ | |
051966c0 | 1778 | if (process_ras(skb, ct, ctinfo, protoff, &data, &ras) < 0) |
f587de0e PM |
1779 | goto drop; |
1780 | ||
1781 | accept: | |
1782 | spin_unlock_bh(&nf_h323_lock); | |
1783 | return NF_ACCEPT; | |
1784 | ||
1785 | drop: | |
1786 | spin_unlock_bh(&nf_h323_lock); | |
b20ab9cc | 1787 | nf_ct_helper_log(skb, ct, "cannot process RAS message"); |
f587de0e PM |
1788 | return NF_DROP; |
1789 | } | |
1790 | ||
1791 | /****************************************************************************/ | |
6002f266 PM |
1792 | static const struct nf_conntrack_expect_policy ras_exp_policy = { |
1793 | .max_expected = 32, | |
1794 | .timeout = 240, | |
1795 | }; | |
1796 | ||
f587de0e PM |
1797 | static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { |
1798 | { | |
1799 | .name = "RAS", | |
1800 | .me = THIS_MODULE, | |
f587de0e | 1801 | .tuple.src.l3num = AF_INET, |
09640e63 | 1802 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
f587de0e | 1803 | .tuple.dst.protonum = IPPROTO_UDP, |
f587de0e | 1804 | .help = ras_help, |
6002f266 | 1805 | .expect_policy = &ras_exp_policy, |
f587de0e PM |
1806 | }, |
1807 | { | |
1808 | .name = "RAS", | |
1809 | .me = THIS_MODULE, | |
f587de0e | 1810 | .tuple.src.l3num = AF_INET6, |
09640e63 | 1811 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
f587de0e | 1812 | .tuple.dst.protonum = IPPROTO_UDP, |
f587de0e | 1813 | .help = ras_help, |
6002f266 | 1814 | .expect_policy = &ras_exp_policy, |
f587de0e PM |
1815 | }, |
1816 | }; | |
1817 | ||
d53e3fc3 LZ |
1818 | static int __init h323_helper_init(void) |
1819 | { | |
1820 | int ret; | |
1821 | ||
1822 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245); | |
1823 | if (ret < 0) | |
1824 | return ret; | |
1825 | ret = nf_conntrack_helpers_register(nf_conntrack_helper_q931, | |
1826 | ARRAY_SIZE(nf_conntrack_helper_q931)); | |
1827 | if (ret < 0) | |
1828 | goto err1; | |
1829 | ret = nf_conntrack_helpers_register(nf_conntrack_helper_ras, | |
1830 | ARRAY_SIZE(nf_conntrack_helper_ras)); | |
1831 | if (ret < 0) | |
1832 | goto err2; | |
1833 | ||
1834 | return 0; | |
1835 | err2: | |
1836 | nf_conntrack_helpers_unregister(nf_conntrack_helper_q931, | |
1837 | ARRAY_SIZE(nf_conntrack_helper_q931)); | |
1838 | err1: | |
1839 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); | |
1840 | return ret; | |
1841 | } | |
1842 | ||
1843 | static void __exit h323_helper_exit(void) | |
1844 | { | |
1845 | nf_conntrack_helpers_unregister(nf_conntrack_helper_ras, | |
1846 | ARRAY_SIZE(nf_conntrack_helper_ras)); | |
1847 | nf_conntrack_helpers_unregister(nf_conntrack_helper_q931, | |
1848 | ARRAY_SIZE(nf_conntrack_helper_q931)); | |
1849 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); | |
1850 | } | |
1851 | ||
f587de0e PM |
1852 | /****************************************************************************/ |
1853 | static void __exit nf_conntrack_h323_fini(void) | |
1854 | { | |
d53e3fc3 | 1855 | h323_helper_exit(); |
f587de0e | 1856 | kfree(h323_buffer); |
0d53778e | 1857 | pr_debug("nf_ct_h323: fini\n"); |
f587de0e PM |
1858 | } |
1859 | ||
1860 | /****************************************************************************/ | |
1861 | static int __init nf_conntrack_h323_init(void) | |
1862 | { | |
1863 | int ret; | |
1864 | ||
dcf67740 FW |
1865 | NF_CT_HELPER_BUILD_BUG_ON(sizeof(struct nf_ct_h323_master)); |
1866 | ||
f587de0e PM |
1867 | h323_buffer = kmalloc(65536, GFP_KERNEL); |
1868 | if (!h323_buffer) | |
1869 | return -ENOMEM; | |
d53e3fc3 | 1870 | ret = h323_helper_init(); |
f587de0e PM |
1871 | if (ret < 0) |
1872 | goto err1; | |
0d53778e | 1873 | pr_debug("nf_ct_h323: init success\n"); |
f587de0e | 1874 | return 0; |
f587de0e | 1875 | err1: |
8a548868 | 1876 | kfree(h323_buffer); |
f587de0e PM |
1877 | return ret; |
1878 | } | |
1879 | ||
1880 | /****************************************************************************/ | |
1881 | module_init(nf_conntrack_h323_init); | |
1882 | module_exit(nf_conntrack_h323_fini); | |
1883 | ||
1884 | EXPORT_SYMBOL_GPL(get_h225_addr); | |
1885 | EXPORT_SYMBOL_GPL(set_h245_addr_hook); | |
1886 | EXPORT_SYMBOL_GPL(set_h225_addr_hook); | |
1887 | EXPORT_SYMBOL_GPL(set_sig_addr_hook); | |
1888 | EXPORT_SYMBOL_GPL(set_ras_addr_hook); | |
1889 | EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); | |
1890 | EXPORT_SYMBOL_GPL(nat_t120_hook); | |
1891 | EXPORT_SYMBOL_GPL(nat_h245_hook); | |
1892 | EXPORT_SYMBOL_GPL(nat_callforwarding_hook); | |
1893 | EXPORT_SYMBOL_GPL(nat_q931_hook); | |
1894 | ||
1895 | MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); | |
1896 | MODULE_DESCRIPTION("H.323 connection tracking helper"); | |
1897 | MODULE_LICENSE("GPL"); | |
1898 | MODULE_ALIAS("ip_conntrack_h323"); | |
be3eed2e PNA |
1899 | MODULE_ALIAS_NFCT_HELPER("RAS"); |
1900 | MODULE_ALIAS_NFCT_HELPER("Q.931"); | |
1901 | MODULE_ALIAS_NFCT_HELPER("H.245"); |