Root/
1 | /* |
2 | * H.323 connection tracking helper |
3 | * |
4 | * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net> |
5 | * |
6 | * This source code is licensed under General Public License version 2. |
7 | * |
8 | * Based on the 'brute force' H.323 connection tracking module by |
9 | * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
10 | * |
11 | * For more information, please see http://nath323.sourceforge.net/ |
12 | */ |
13 | |
14 | #include <linux/module.h> |
15 | #include <linux/moduleparam.h> |
16 | #include <linux/ctype.h> |
17 | #include <linux/inet.h> |
18 | #include <linux/in.h> |
19 | #include <linux/ip.h> |
20 | #include <linux/slab.h> |
21 | #include <linux/udp.h> |
22 | #include <linux/tcp.h> |
23 | #include <linux/skbuff.h> |
24 | #include <net/route.h> |
25 | #include <net/ip6_route.h> |
26 | |
27 | #include <net/netfilter/nf_conntrack.h> |
28 | #include <net/netfilter/nf_conntrack_core.h> |
29 | #include <net/netfilter/nf_conntrack_tuple.h> |
30 | #include <net/netfilter/nf_conntrack_expect.h> |
31 | #include <net/netfilter/nf_conntrack_ecache.h> |
32 | #include <net/netfilter/nf_conntrack_helper.h> |
33 | #include <net/netfilter/nf_conntrack_zones.h> |
34 | #include <linux/netfilter/nf_conntrack_h323.h> |
35 | |
36 | /* Parameters */ |
37 | static unsigned int default_rrq_ttl __read_mostly = 300; |
38 | module_param(default_rrq_ttl, uint, 0600); |
39 | MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ"); |
40 | |
41 | static int gkrouted_only __read_mostly = 1; |
42 | module_param(gkrouted_only, int, 0600); |
43 | MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper"); |
44 | |
45 | static int callforward_filter __read_mostly = 1; |
46 | module_param(callforward_filter, bool, 0600); |
47 | MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations " |
48 | "if both endpoints are on different sides " |
49 | "(determined by routing information)"); |
50 | |
51 | /* Hooks for NAT */ |
52 | int (*set_h245_addr_hook) (struct sk_buff *skb, |
53 | unsigned char **data, int dataoff, |
54 | H245_TransportAddress *taddr, |
55 | union nf_inet_addr *addr, __be16 port) |
56 | __read_mostly; |
57 | int (*set_h225_addr_hook) (struct sk_buff *skb, |
58 | unsigned char **data, int dataoff, |
59 | TransportAddress *taddr, |
60 | union nf_inet_addr *addr, __be16 port) |
61 | __read_mostly; |
62 | int (*set_sig_addr_hook) (struct sk_buff *skb, |
63 | struct nf_conn *ct, |
64 | enum ip_conntrack_info ctinfo, |
65 | unsigned char **data, |
66 | TransportAddress *taddr, int count) __read_mostly; |
67 | int (*set_ras_addr_hook) (struct sk_buff *skb, |
68 | struct nf_conn *ct, |
69 | enum ip_conntrack_info ctinfo, |
70 | unsigned char **data, |
71 | TransportAddress *taddr, int count) __read_mostly; |
72 | int (*nat_rtp_rtcp_hook) (struct sk_buff *skb, |
73 | struct nf_conn *ct, |
74 | enum ip_conntrack_info ctinfo, |
75 | unsigned char **data, int dataoff, |
76 | H245_TransportAddress *taddr, |
77 | __be16 port, __be16 rtp_port, |
78 | struct nf_conntrack_expect *rtp_exp, |
79 | struct nf_conntrack_expect *rtcp_exp) __read_mostly; |
80 | int (*nat_t120_hook) (struct sk_buff *skb, |
81 | struct nf_conn *ct, |
82 | enum ip_conntrack_info ctinfo, |
83 | unsigned char **data, int dataoff, |
84 | H245_TransportAddress *taddr, __be16 port, |
85 | struct nf_conntrack_expect *exp) __read_mostly; |
86 | int (*nat_h245_hook) (struct sk_buff *skb, |
87 | struct nf_conn *ct, |
88 | enum ip_conntrack_info ctinfo, |
89 | unsigned char **data, int dataoff, |
90 | TransportAddress *taddr, __be16 port, |
91 | struct nf_conntrack_expect *exp) __read_mostly; |
92 | int (*nat_callforwarding_hook) (struct sk_buff *skb, |
93 | struct nf_conn *ct, |
94 | enum ip_conntrack_info ctinfo, |
95 | unsigned char **data, int dataoff, |
96 | TransportAddress *taddr, __be16 port, |
97 | struct nf_conntrack_expect *exp) __read_mostly; |
98 | int (*nat_q931_hook) (struct sk_buff *skb, |
99 | struct nf_conn *ct, |
100 | enum ip_conntrack_info ctinfo, |
101 | unsigned char **data, TransportAddress *taddr, int idx, |
102 | __be16 port, struct nf_conntrack_expect *exp) |
103 | __read_mostly; |
104 | |
105 | static DEFINE_SPINLOCK(nf_h323_lock); |
106 | static char *h323_buffer; |
107 | |
108 | static struct nf_conntrack_helper nf_conntrack_helper_h245; |
109 | static struct nf_conntrack_helper nf_conntrack_helper_q931[]; |
110 | static struct nf_conntrack_helper nf_conntrack_helper_ras[]; |
111 | |
112 | /****************************************************************************/ |
113 | static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff, |
114 | struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
115 | unsigned char **data, int *datalen, int *dataoff) |
116 | { |
117 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
118 | int dir = CTINFO2DIR(ctinfo); |
119 | const struct tcphdr *th; |
120 | struct tcphdr _tcph; |
121 | int tcpdatalen; |
122 | int tcpdataoff; |
123 | unsigned char *tpkt; |
124 | int tpktlen; |
125 | int tpktoff; |
126 | |
127 | /* Get TCP header */ |
128 | th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph); |
129 | if (th == NULL) |
130 | return 0; |
131 | |
132 | /* Get TCP data offset */ |
133 | tcpdataoff = protoff + th->doff * 4; |
134 | |
135 | /* Get TCP data length */ |
136 | tcpdatalen = skb->len - tcpdataoff; |
137 | if (tcpdatalen <= 0) /* No TCP data */ |
138 | goto clear_out; |
139 | |
140 | if (*data == NULL) { /* first TPKT */ |
141 | /* Get first TPKT pointer */ |
142 | tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen, |
143 | h323_buffer); |
144 | BUG_ON(tpkt == NULL); |
145 | |
146 | /* Validate TPKT identifier */ |
147 | if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) { |
148 | /* Netmeeting sends TPKT header and data separately */ |
149 | if (info->tpkt_len[dir] > 0) { |
150 | pr_debug("nf_ct_h323: previous packet " |
151 | "indicated separate TPKT data of %hu " |
152 | "bytes\n", info->tpkt_len[dir]); |
153 | if (info->tpkt_len[dir] <= tcpdatalen) { |
154 | /* Yes, there was a TPKT header |
155 | * received */ |
156 | *data = tpkt; |
157 | *datalen = info->tpkt_len[dir]; |
158 | *dataoff = 0; |
159 | goto out; |
160 | } |
161 | |
162 | /* Fragmented TPKT */ |
163 | pr_debug("nf_ct_h323: fragmented TPKT\n"); |
164 | goto clear_out; |
165 | } |
166 | |
167 | /* It is not even a TPKT */ |
168 | return 0; |
169 | } |
170 | tpktoff = 0; |
171 | } else { /* Next TPKT */ |
172 | tpktoff = *dataoff + *datalen; |
173 | tcpdatalen -= tpktoff; |
174 | if (tcpdatalen <= 4) /* No more TPKT */ |
175 | goto clear_out; |
176 | tpkt = *data + *datalen; |
177 | |
178 | /* Validate TPKT identifier */ |
179 | if (tpkt[0] != 0x03 || tpkt[1] != 0) |
180 | goto clear_out; |
181 | } |
182 | |
183 | /* Validate TPKT length */ |
184 | tpktlen = tpkt[2] * 256 + tpkt[3]; |
185 | if (tpktlen < 4) |
186 | goto clear_out; |
187 | if (tpktlen > tcpdatalen) { |
188 | if (tcpdatalen == 4) { /* Separate TPKT header */ |
189 | /* Netmeeting sends TPKT header and data separately */ |
190 | pr_debug("nf_ct_h323: separate TPKT header indicates " |
191 | "there will be TPKT data of %hu bytes\n", |
192 | tpktlen - 4); |
193 | info->tpkt_len[dir] = tpktlen - 4; |
194 | return 0; |
195 | } |
196 | |
197 | if (net_ratelimit()) |
198 | printk("nf_ct_h323: incomplete TPKT (fragmented?)\n"); |
199 | goto clear_out; |
200 | } |
201 | |
202 | /* This is the encapsulated data */ |
203 | *data = tpkt + 4; |
204 | *datalen = tpktlen - 4; |
205 | *dataoff = tpktoff + 4; |
206 | |
207 | out: |
208 | /* Clear TPKT length */ |
209 | info->tpkt_len[dir] = 0; |
210 | return 1; |
211 | |
212 | clear_out: |
213 | info->tpkt_len[dir] = 0; |
214 | return 0; |
215 | } |
216 | |
217 | /****************************************************************************/ |
218 | static int get_h245_addr(struct nf_conn *ct, const unsigned char *data, |
219 | H245_TransportAddress *taddr, |
220 | union nf_inet_addr *addr, __be16 *port) |
221 | { |
222 | const unsigned char *p; |
223 | int len; |
224 | |
225 | if (taddr->choice != eH245_TransportAddress_unicastAddress) |
226 | return 0; |
227 | |
228 | switch (taddr->unicastAddress.choice) { |
229 | case eUnicastAddress_iPAddress: |
230 | if (nf_ct_l3num(ct) != AF_INET) |
231 | return 0; |
232 | p = data + taddr->unicastAddress.iPAddress.network; |
233 | len = 4; |
234 | break; |
235 | case eUnicastAddress_iP6Address: |
236 | if (nf_ct_l3num(ct) != AF_INET6) |
237 | return 0; |
238 | p = data + taddr->unicastAddress.iP6Address.network; |
239 | len = 16; |
240 | break; |
241 | default: |
242 | return 0; |
243 | } |
244 | |
245 | memcpy(addr, p, len); |
246 | memset((void *)addr + len, 0, sizeof(*addr) - len); |
247 | memcpy(port, p + len, sizeof(__be16)); |
248 | |
249 | return 1; |
250 | } |
251 | |
252 | /****************************************************************************/ |
253 | static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct, |
254 | enum ip_conntrack_info ctinfo, |
255 | unsigned char **data, int dataoff, |
256 | H245_TransportAddress *taddr) |
257 | { |
258 | int dir = CTINFO2DIR(ctinfo); |
259 | int ret = 0; |
260 | __be16 port; |
261 | __be16 rtp_port, rtcp_port; |
262 | union nf_inet_addr addr; |
263 | struct nf_conntrack_expect *rtp_exp; |
264 | struct nf_conntrack_expect *rtcp_exp; |
265 | typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp; |
266 | |
267 | /* Read RTP or RTCP address */ |
268 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || |
269 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
270 | port == 0) |
271 | return 0; |
272 | |
273 | /* RTP port is even */ |
274 | port &= htons(~1); |
275 | rtp_port = port; |
276 | rtcp_port = htons(ntohs(port) + 1); |
277 | |
278 | /* Create expect for RTP */ |
279 | if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL) |
280 | return -1; |
281 | nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
282 | &ct->tuplehash[!dir].tuple.src.u3, |
283 | &ct->tuplehash[!dir].tuple.dst.u3, |
284 | IPPROTO_UDP, NULL, &rtp_port); |
285 | |
286 | /* Create expect for RTCP */ |
287 | if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) { |
288 | nf_ct_expect_put(rtp_exp); |
289 | return -1; |
290 | } |
291 | nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
292 | &ct->tuplehash[!dir].tuple.src.u3, |
293 | &ct->tuplehash[!dir].tuple.dst.u3, |
294 | IPPROTO_UDP, NULL, &rtcp_port); |
295 | |
296 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
297 | &ct->tuplehash[!dir].tuple.dst.u3, |
298 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
299 | (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) && |
300 | ct->status & IPS_NAT_MASK) { |
301 | /* NAT needed */ |
302 | ret = nat_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
303 | taddr, port, rtp_port, rtp_exp, rtcp_exp); |
304 | } else { /* Conntrack only */ |
305 | if (nf_ct_expect_related(rtp_exp) == 0) { |
306 | if (nf_ct_expect_related(rtcp_exp) == 0) { |
307 | pr_debug("nf_ct_h323: expect RTP "); |
308 | nf_ct_dump_tuple(&rtp_exp->tuple); |
309 | pr_debug("nf_ct_h323: expect RTCP "); |
310 | nf_ct_dump_tuple(&rtcp_exp->tuple); |
311 | } else { |
312 | nf_ct_unexpect_related(rtp_exp); |
313 | ret = -1; |
314 | } |
315 | } else |
316 | ret = -1; |
317 | } |
318 | |
319 | nf_ct_expect_put(rtp_exp); |
320 | nf_ct_expect_put(rtcp_exp); |
321 | |
322 | return ret; |
323 | } |
324 | |
325 | /****************************************************************************/ |
326 | static int expect_t120(struct sk_buff *skb, |
327 | struct nf_conn *ct, |
328 | enum ip_conntrack_info ctinfo, |
329 | unsigned char **data, int dataoff, |
330 | H245_TransportAddress *taddr) |
331 | { |
332 | int dir = CTINFO2DIR(ctinfo); |
333 | int ret = 0; |
334 | __be16 port; |
335 | union nf_inet_addr addr; |
336 | struct nf_conntrack_expect *exp; |
337 | typeof(nat_t120_hook) nat_t120; |
338 | |
339 | /* Read T.120 address */ |
340 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || |
341 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
342 | port == 0) |
343 | return 0; |
344 | |
345 | /* Create expect for T.120 connections */ |
346 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
347 | return -1; |
348 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
349 | &ct->tuplehash[!dir].tuple.src.u3, |
350 | &ct->tuplehash[!dir].tuple.dst.u3, |
351 | IPPROTO_TCP, NULL, &port); |
352 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */ |
353 | |
354 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
355 | &ct->tuplehash[!dir].tuple.dst.u3, |
356 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
357 | (nat_t120 = rcu_dereference(nat_t120_hook)) && |
358 | ct->status & IPS_NAT_MASK) { |
359 | /* NAT needed */ |
360 | ret = nat_t120(skb, ct, ctinfo, data, dataoff, taddr, |
361 | port, exp); |
362 | } else { /* Conntrack only */ |
363 | if (nf_ct_expect_related(exp) == 0) { |
364 | pr_debug("nf_ct_h323: expect T.120 "); |
365 | nf_ct_dump_tuple(&exp->tuple); |
366 | } else |
367 | ret = -1; |
368 | } |
369 | |
370 | nf_ct_expect_put(exp); |
371 | |
372 | return ret; |
373 | } |
374 | |
375 | /****************************************************************************/ |
376 | static int process_h245_channel(struct sk_buff *skb, |
377 | struct nf_conn *ct, |
378 | enum ip_conntrack_info ctinfo, |
379 | unsigned char **data, int dataoff, |
380 | H2250LogicalChannelParameters *channel) |
381 | { |
382 | int ret; |
383 | |
384 | if (channel->options & eH2250LogicalChannelParameters_mediaChannel) { |
385 | /* RTP */ |
386 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
387 | &channel->mediaChannel); |
388 | if (ret < 0) |
389 | return -1; |
390 | } |
391 | |
392 | if (channel-> |
393 | options & eH2250LogicalChannelParameters_mediaControlChannel) { |
394 | /* RTCP */ |
395 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
396 | &channel->mediaControlChannel); |
397 | if (ret < 0) |
398 | return -1; |
399 | } |
400 | |
401 | return 0; |
402 | } |
403 | |
404 | /****************************************************************************/ |
405 | static int process_olc(struct sk_buff *skb, struct nf_conn *ct, |
406 | enum ip_conntrack_info ctinfo, |
407 | unsigned char **data, int dataoff, |
408 | OpenLogicalChannel *olc) |
409 | { |
410 | int ret; |
411 | |
412 | pr_debug("nf_ct_h323: OpenLogicalChannel\n"); |
413 | |
414 | if (olc->forwardLogicalChannelParameters.multiplexParameters.choice == |
415 | eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters) |
416 | { |
417 | ret = process_h245_channel(skb, ct, ctinfo, data, dataoff, |
418 | &olc-> |
419 | forwardLogicalChannelParameters. |
420 | multiplexParameters. |
421 | h2250LogicalChannelParameters); |
422 | if (ret < 0) |
423 | return -1; |
424 | } |
425 | |
426 | if ((olc->options & |
427 | eOpenLogicalChannel_reverseLogicalChannelParameters) && |
428 | (olc->reverseLogicalChannelParameters.options & |
429 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters) |
430 | && (olc->reverseLogicalChannelParameters.multiplexParameters. |
431 | choice == |
432 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) |
433 | { |
434 | ret = |
435 | process_h245_channel(skb, ct, ctinfo, data, dataoff, |
436 | &olc-> |
437 | reverseLogicalChannelParameters. |
438 | multiplexParameters. |
439 | h2250LogicalChannelParameters); |
440 | if (ret < 0) |
441 | return -1; |
442 | } |
443 | |
444 | if ((olc->options & eOpenLogicalChannel_separateStack) && |
445 | olc->forwardLogicalChannelParameters.dataType.choice == |
446 | eDataType_data && |
447 | olc->forwardLogicalChannelParameters.dataType.data.application. |
448 | choice == eDataApplicationCapability_application_t120 && |
449 | olc->forwardLogicalChannelParameters.dataType.data.application. |
450 | t120.choice == eDataProtocolCapability_separateLANStack && |
451 | olc->separateStack.networkAddress.choice == |
452 | eNetworkAccessParameters_networkAddress_localAreaAddress) { |
453 | ret = expect_t120(skb, ct, ctinfo, data, dataoff, |
454 | &olc->separateStack.networkAddress. |
455 | localAreaAddress); |
456 | if (ret < 0) |
457 | return -1; |
458 | } |
459 | |
460 | return 0; |
461 | } |
462 | |
463 | /****************************************************************************/ |
464 | static int process_olca(struct sk_buff *skb, struct nf_conn *ct, |
465 | enum ip_conntrack_info ctinfo, |
466 | unsigned char **data, int dataoff, |
467 | OpenLogicalChannelAck *olca) |
468 | { |
469 | H2250LogicalChannelAckParameters *ack; |
470 | int ret; |
471 | |
472 | pr_debug("nf_ct_h323: OpenLogicalChannelAck\n"); |
473 | |
474 | if ((olca->options & |
475 | eOpenLogicalChannelAck_reverseLogicalChannelParameters) && |
476 | (olca->reverseLogicalChannelParameters.options & |
477 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters) |
478 | && (olca->reverseLogicalChannelParameters.multiplexParameters. |
479 | choice == |
480 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) |
481 | { |
482 | ret = process_h245_channel(skb, ct, ctinfo, data, dataoff, |
483 | &olca-> |
484 | reverseLogicalChannelParameters. |
485 | multiplexParameters. |
486 | h2250LogicalChannelParameters); |
487 | if (ret < 0) |
488 | return -1; |
489 | } |
490 | |
491 | if ((olca->options & |
492 | eOpenLogicalChannelAck_forwardMultiplexAckParameters) && |
493 | (olca->forwardMultiplexAckParameters.choice == |
494 | eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters)) |
495 | { |
496 | ack = &olca->forwardMultiplexAckParameters. |
497 | h2250LogicalChannelAckParameters; |
498 | if (ack->options & |
499 | eH2250LogicalChannelAckParameters_mediaChannel) { |
500 | /* RTP */ |
501 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
502 | &ack->mediaChannel); |
503 | if (ret < 0) |
504 | return -1; |
505 | } |
506 | |
507 | if (ack->options & |
508 | eH2250LogicalChannelAckParameters_mediaControlChannel) { |
509 | /* RTCP */ |
510 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
511 | &ack->mediaControlChannel); |
512 | if (ret < 0) |
513 | return -1; |
514 | } |
515 | } |
516 | |
517 | if ((olca->options & eOpenLogicalChannelAck_separateStack) && |
518 | olca->separateStack.networkAddress.choice == |
519 | eNetworkAccessParameters_networkAddress_localAreaAddress) { |
520 | ret = expect_t120(skb, ct, ctinfo, data, dataoff, |
521 | &olca->separateStack.networkAddress. |
522 | localAreaAddress); |
523 | if (ret < 0) |
524 | return -1; |
525 | } |
526 | |
527 | return 0; |
528 | } |
529 | |
530 | /****************************************************************************/ |
531 | static int process_h245(struct sk_buff *skb, struct nf_conn *ct, |
532 | enum ip_conntrack_info ctinfo, |
533 | unsigned char **data, int dataoff, |
534 | MultimediaSystemControlMessage *mscm) |
535 | { |
536 | switch (mscm->choice) { |
537 | case eMultimediaSystemControlMessage_request: |
538 | if (mscm->request.choice == |
539 | eRequestMessage_openLogicalChannel) { |
540 | return process_olc(skb, ct, ctinfo, data, dataoff, |
541 | &mscm->request.openLogicalChannel); |
542 | } |
543 | pr_debug("nf_ct_h323: H.245 Request %d\n", |
544 | mscm->request.choice); |
545 | break; |
546 | case eMultimediaSystemControlMessage_response: |
547 | if (mscm->response.choice == |
548 | eResponseMessage_openLogicalChannelAck) { |
549 | return process_olca(skb, ct, ctinfo, data, dataoff, |
550 | &mscm->response. |
551 | openLogicalChannelAck); |
552 | } |
553 | pr_debug("nf_ct_h323: H.245 Response %d\n", |
554 | mscm->response.choice); |
555 | break; |
556 | default: |
557 | pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice); |
558 | break; |
559 | } |
560 | |
561 | return 0; |
562 | } |
563 | |
564 | /****************************************************************************/ |
565 | static int h245_help(struct sk_buff *skb, unsigned int protoff, |
566 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
567 | { |
568 | static MultimediaSystemControlMessage mscm; |
569 | unsigned char *data = NULL; |
570 | int datalen; |
571 | int dataoff; |
572 | int ret; |
573 | |
574 | /* Until there's been traffic both ways, don't look in packets. */ |
575 | if (ctinfo != IP_CT_ESTABLISHED && |
576 | ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) { |
577 | return NF_ACCEPT; |
578 | } |
579 | pr_debug("nf_ct_h245: skblen = %u\n", skb->len); |
580 | |
581 | spin_lock_bh(&nf_h323_lock); |
582 | |
583 | /* Process each TPKT */ |
584 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
585 | &data, &datalen, &dataoff)) { |
586 | pr_debug("nf_ct_h245: TPKT len=%d ", datalen); |
587 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
588 | |
589 | /* Decode H.245 signal */ |
590 | ret = DecodeMultimediaSystemControlMessage(data, datalen, |
591 | &mscm); |
592 | if (ret < 0) { |
593 | pr_debug("nf_ct_h245: decoding error: %s\n", |
594 | ret == H323_ERROR_BOUND ? |
595 | "out of bound" : "out of range"); |
596 | /* We don't drop when decoding error */ |
597 | break; |
598 | } |
599 | |
600 | /* Process H.245 signal */ |
601 | if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0) |
602 | goto drop; |
603 | } |
604 | |
605 | spin_unlock_bh(&nf_h323_lock); |
606 | return NF_ACCEPT; |
607 | |
608 | drop: |
609 | spin_unlock_bh(&nf_h323_lock); |
610 | if (net_ratelimit()) |
611 | printk("nf_ct_h245: packet dropped\n"); |
612 | return NF_DROP; |
613 | } |
614 | |
615 | /****************************************************************************/ |
616 | static const struct nf_conntrack_expect_policy h245_exp_policy = { |
617 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */, |
618 | .timeout = 240, |
619 | }; |
620 | |
621 | static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { |
622 | .name = "H.245", |
623 | .me = THIS_MODULE, |
624 | .tuple.src.l3num = AF_UNSPEC, |
625 | .tuple.dst.protonum = IPPROTO_UDP, |
626 | .help = h245_help, |
627 | .expect_policy = &h245_exp_policy, |
628 | }; |
629 | |
630 | /****************************************************************************/ |
631 | int get_h225_addr(struct nf_conn *ct, unsigned char *data, |
632 | TransportAddress *taddr, |
633 | union nf_inet_addr *addr, __be16 *port) |
634 | { |
635 | const unsigned char *p; |
636 | int len; |
637 | |
638 | switch (taddr->choice) { |
639 | case eTransportAddress_ipAddress: |
640 | if (nf_ct_l3num(ct) != AF_INET) |
641 | return 0; |
642 | p = data + taddr->ipAddress.ip; |
643 | len = 4; |
644 | break; |
645 | case eTransportAddress_ip6Address: |
646 | if (nf_ct_l3num(ct) != AF_INET6) |
647 | return 0; |
648 | p = data + taddr->ip6Address.ip; |
649 | len = 16; |
650 | break; |
651 | default: |
652 | return 0; |
653 | } |
654 | |
655 | memcpy(addr, p, len); |
656 | memset((void *)addr + len, 0, sizeof(*addr) - len); |
657 | memcpy(port, p + len, sizeof(__be16)); |
658 | |
659 | return 1; |
660 | } |
661 | |
662 | /****************************************************************************/ |
663 | static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, |
664 | enum ip_conntrack_info ctinfo, |
665 | unsigned char **data, int dataoff, |
666 | TransportAddress *taddr) |
667 | { |
668 | int dir = CTINFO2DIR(ctinfo); |
669 | int ret = 0; |
670 | __be16 port; |
671 | union nf_inet_addr addr; |
672 | struct nf_conntrack_expect *exp; |
673 | typeof(nat_h245_hook) nat_h245; |
674 | |
675 | /* Read h245Address */ |
676 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || |
677 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
678 | port == 0) |
679 | return 0; |
680 | |
681 | /* Create expect for h245 connection */ |
682 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
683 | return -1; |
684 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
685 | &ct->tuplehash[!dir].tuple.src.u3, |
686 | &ct->tuplehash[!dir].tuple.dst.u3, |
687 | IPPROTO_TCP, NULL, &port); |
688 | exp->helper = &nf_conntrack_helper_h245; |
689 | |
690 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
691 | &ct->tuplehash[!dir].tuple.dst.u3, |
692 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
693 | (nat_h245 = rcu_dereference(nat_h245_hook)) && |
694 | ct->status & IPS_NAT_MASK) { |
695 | /* NAT needed */ |
696 | ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr, |
697 | port, exp); |
698 | } else { /* Conntrack only */ |
699 | if (nf_ct_expect_related(exp) == 0) { |
700 | pr_debug("nf_ct_q931: expect H.245 "); |
701 | nf_ct_dump_tuple(&exp->tuple); |
702 | } else |
703 | ret = -1; |
704 | } |
705 | |
706 | nf_ct_expect_put(exp); |
707 | |
708 | return ret; |
709 | } |
710 | |
711 | /* If the calling party is on the same side of the forward-to party, |
712 | * we don't need to track the second call */ |
713 | static int callforward_do_filter(const union nf_inet_addr *src, |
714 | const union nf_inet_addr *dst, |
715 | u_int8_t family) |
716 | { |
717 | const struct nf_afinfo *afinfo; |
718 | struct flowi fl1, fl2; |
719 | int ret = 0; |
720 | |
721 | /* rcu_read_lock()ed by nf_hook_slow() */ |
722 | afinfo = nf_get_afinfo(family); |
723 | if (!afinfo) |
724 | return 0; |
725 | |
726 | memset(&fl1, 0, sizeof(fl1)); |
727 | memset(&fl2, 0, sizeof(fl2)); |
728 | |
729 | switch (family) { |
730 | case AF_INET: { |
731 | struct rtable *rt1, *rt2; |
732 | |
733 | fl1.fl4_dst = src->ip; |
734 | fl2.fl4_dst = dst->ip; |
735 | if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) { |
736 | if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) { |
737 | if (rt1->rt_gateway == rt2->rt_gateway && |
738 | rt1->u.dst.dev == rt2->u.dst.dev) |
739 | ret = 1; |
740 | dst_release(&rt2->u.dst); |
741 | } |
742 | dst_release(&rt1->u.dst); |
743 | } |
744 | break; |
745 | } |
746 | #if defined(CONFIG_NF_CONNTRACK_IPV6) || \ |
747 | defined(CONFIG_NF_CONNTRACK_IPV6_MODULE) |
748 | case AF_INET6: { |
749 | struct rt6_info *rt1, *rt2; |
750 | |
751 | memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst)); |
752 | memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst)); |
753 | if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) { |
754 | if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) { |
755 | if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway, |
756 | sizeof(rt1->rt6i_gateway)) && |
757 | rt1->u.dst.dev == rt2->u.dst.dev) |
758 | ret = 1; |
759 | dst_release(&rt2->u.dst); |
760 | } |
761 | dst_release(&rt1->u.dst); |
762 | } |
763 | break; |
764 | } |
765 | #endif |
766 | } |
767 | return ret; |
768 | |
769 | } |
770 | |
771 | /****************************************************************************/ |
772 | static int expect_callforwarding(struct sk_buff *skb, |
773 | struct nf_conn *ct, |
774 | enum ip_conntrack_info ctinfo, |
775 | unsigned char **data, int dataoff, |
776 | TransportAddress *taddr) |
777 | { |
778 | int dir = CTINFO2DIR(ctinfo); |
779 | int ret = 0; |
780 | __be16 port; |
781 | union nf_inet_addr addr; |
782 | struct nf_conntrack_expect *exp; |
783 | typeof(nat_callforwarding_hook) nat_callforwarding; |
784 | |
785 | /* Read alternativeAddress */ |
786 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) |
787 | return 0; |
788 | |
789 | /* If the calling party is on the same side of the forward-to party, |
790 | * we don't need to track the second call */ |
791 | if (callforward_filter && |
792 | callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3, |
793 | nf_ct_l3num(ct))) { |
794 | pr_debug("nf_ct_q931: Call Forwarding not tracked\n"); |
795 | return 0; |
796 | } |
797 | |
798 | /* Create expect for the second call leg */ |
799 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
800 | return -1; |
801 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
802 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
803 | IPPROTO_TCP, NULL, &port); |
804 | exp->helper = nf_conntrack_helper_q931; |
805 | |
806 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
807 | &ct->tuplehash[!dir].tuple.dst.u3, |
808 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
809 | (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && |
810 | ct->status & IPS_NAT_MASK) { |
811 | /* Need NAT */ |
812 | ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff, |
813 | taddr, port, exp); |
814 | } else { /* Conntrack only */ |
815 | if (nf_ct_expect_related(exp) == 0) { |
816 | pr_debug("nf_ct_q931: expect Call Forwarding "); |
817 | nf_ct_dump_tuple(&exp->tuple); |
818 | } else |
819 | ret = -1; |
820 | } |
821 | |
822 | nf_ct_expect_put(exp); |
823 | |
824 | return ret; |
825 | } |
826 | |
827 | /****************************************************************************/ |
828 | static int process_setup(struct sk_buff *skb, struct nf_conn *ct, |
829 | enum ip_conntrack_info ctinfo, |
830 | unsigned char **data, int dataoff, |
831 | Setup_UUIE *setup) |
832 | { |
833 | int dir = CTINFO2DIR(ctinfo); |
834 | int ret; |
835 | int i; |
836 | __be16 port; |
837 | union nf_inet_addr addr; |
838 | typeof(set_h225_addr_hook) set_h225_addr; |
839 | |
840 | pr_debug("nf_ct_q931: Setup\n"); |
841 | |
842 | if (setup->options & eSetup_UUIE_h245Address) { |
843 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
844 | &setup->h245Address); |
845 | if (ret < 0) |
846 | return -1; |
847 | } |
848 | |
849 | set_h225_addr = rcu_dereference(set_h225_addr_hook); |
850 | if ((setup->options & eSetup_UUIE_destCallSignalAddress) && |
851 | (set_h225_addr) && ct->status & IPS_NAT_MASK && |
852 | get_h225_addr(ct, *data, &setup->destCallSignalAddress, |
853 | &addr, &port) && |
854 | memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { |
855 | pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
856 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3, |
857 | ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port)); |
858 | ret = set_h225_addr(skb, data, dataoff, |
859 | &setup->destCallSignalAddress, |
860 | &ct->tuplehash[!dir].tuple.src.u3, |
861 | ct->tuplehash[!dir].tuple.src.u.tcp.port); |
862 | if (ret < 0) |
863 | return -1; |
864 | } |
865 | |
866 | if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && |
867 | (set_h225_addr) && ct->status & IPS_NAT_MASK && |
868 | get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, |
869 | &addr, &port) && |
870 | memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { |
871 | pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
872 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3, |
873 | ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); |
874 | ret = set_h225_addr(skb, data, dataoff, |
875 | &setup->sourceCallSignalAddress, |
876 | &ct->tuplehash[!dir].tuple.dst.u3, |
877 | ct->tuplehash[!dir].tuple.dst.u.tcp.port); |
878 | if (ret < 0) |
879 | return -1; |
880 | } |
881 | |
882 | if (setup->options & eSetup_UUIE_fastStart) { |
883 | for (i = 0; i < setup->fastStart.count; i++) { |
884 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
885 | &setup->fastStart.item[i]); |
886 | if (ret < 0) |
887 | return -1; |
888 | } |
889 | } |
890 | |
891 | return 0; |
892 | } |
893 | |
894 | /****************************************************************************/ |
895 | static int process_callproceeding(struct sk_buff *skb, |
896 | struct nf_conn *ct, |
897 | enum ip_conntrack_info ctinfo, |
898 | unsigned char **data, int dataoff, |
899 | CallProceeding_UUIE *callproc) |
900 | { |
901 | int ret; |
902 | int i; |
903 | |
904 | pr_debug("nf_ct_q931: CallProceeding\n"); |
905 | |
906 | if (callproc->options & eCallProceeding_UUIE_h245Address) { |
907 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
908 | &callproc->h245Address); |
909 | if (ret < 0) |
910 | return -1; |
911 | } |
912 | |
913 | if (callproc->options & eCallProceeding_UUIE_fastStart) { |
914 | for (i = 0; i < callproc->fastStart.count; i++) { |
915 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
916 | &callproc->fastStart.item[i]); |
917 | if (ret < 0) |
918 | return -1; |
919 | } |
920 | } |
921 | |
922 | return 0; |
923 | } |
924 | |
925 | /****************************************************************************/ |
926 | static int process_connect(struct sk_buff *skb, struct nf_conn *ct, |
927 | enum ip_conntrack_info ctinfo, |
928 | unsigned char **data, int dataoff, |
929 | Connect_UUIE *connect) |
930 | { |
931 | int ret; |
932 | int i; |
933 | |
934 | pr_debug("nf_ct_q931: Connect\n"); |
935 | |
936 | if (connect->options & eConnect_UUIE_h245Address) { |
937 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
938 | &connect->h245Address); |
939 | if (ret < 0) |
940 | return -1; |
941 | } |
942 | |
943 | if (connect->options & eConnect_UUIE_fastStart) { |
944 | for (i = 0; i < connect->fastStart.count; i++) { |
945 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
946 | &connect->fastStart.item[i]); |
947 | if (ret < 0) |
948 | return -1; |
949 | } |
950 | } |
951 | |
952 | return 0; |
953 | } |
954 | |
955 | /****************************************************************************/ |
956 | static int process_alerting(struct sk_buff *skb, struct nf_conn *ct, |
957 | enum ip_conntrack_info ctinfo, |
958 | unsigned char **data, int dataoff, |
959 | Alerting_UUIE *alert) |
960 | { |
961 | int ret; |
962 | int i; |
963 | |
964 | pr_debug("nf_ct_q931: Alerting\n"); |
965 | |
966 | if (alert->options & eAlerting_UUIE_h245Address) { |
967 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
968 | &alert->h245Address); |
969 | if (ret < 0) |
970 | return -1; |
971 | } |
972 | |
973 | if (alert->options & eAlerting_UUIE_fastStart) { |
974 | for (i = 0; i < alert->fastStart.count; i++) { |
975 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
976 | &alert->fastStart.item[i]); |
977 | if (ret < 0) |
978 | return -1; |
979 | } |
980 | } |
981 | |
982 | return 0; |
983 | } |
984 | |
985 | /****************************************************************************/ |
986 | static int process_facility(struct sk_buff *skb, struct nf_conn *ct, |
987 | enum ip_conntrack_info ctinfo, |
988 | unsigned char **data, int dataoff, |
989 | Facility_UUIE *facility) |
990 | { |
991 | int ret; |
992 | int i; |
993 | |
994 | pr_debug("nf_ct_q931: Facility\n"); |
995 | |
996 | if (facility->reason.choice == eFacilityReason_callForwarded) { |
997 | if (facility->options & eFacility_UUIE_alternativeAddress) |
998 | return expect_callforwarding(skb, ct, ctinfo, data, |
999 | dataoff, |
1000 | &facility-> |
1001 | alternativeAddress); |
1002 | return 0; |
1003 | } |
1004 | |
1005 | if (facility->options & eFacility_UUIE_h245Address) { |
1006 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
1007 | &facility->h245Address); |
1008 | if (ret < 0) |
1009 | return -1; |
1010 | } |
1011 | |
1012 | if (facility->options & eFacility_UUIE_fastStart) { |
1013 | for (i = 0; i < facility->fastStart.count; i++) { |
1014 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
1015 | &facility->fastStart.item[i]); |
1016 | if (ret < 0) |
1017 | return -1; |
1018 | } |
1019 | } |
1020 | |
1021 | return 0; |
1022 | } |
1023 | |
1024 | /****************************************************************************/ |
1025 | static int process_progress(struct sk_buff *skb, struct nf_conn *ct, |
1026 | enum ip_conntrack_info ctinfo, |
1027 | unsigned char **data, int dataoff, |
1028 | Progress_UUIE *progress) |
1029 | { |
1030 | int ret; |
1031 | int i; |
1032 | |
1033 | pr_debug("nf_ct_q931: Progress\n"); |
1034 | |
1035 | if (progress->options & eProgress_UUIE_h245Address) { |
1036 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
1037 | &progress->h245Address); |
1038 | if (ret < 0) |
1039 | return -1; |
1040 | } |
1041 | |
1042 | if (progress->options & eProgress_UUIE_fastStart) { |
1043 | for (i = 0; i < progress->fastStart.count; i++) { |
1044 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
1045 | &progress->fastStart.item[i]); |
1046 | if (ret < 0) |
1047 | return -1; |
1048 | } |
1049 | } |
1050 | |
1051 | return 0; |
1052 | } |
1053 | |
1054 | /****************************************************************************/ |
1055 | static int process_q931(struct sk_buff *skb, struct nf_conn *ct, |
1056 | enum ip_conntrack_info ctinfo, |
1057 | unsigned char **data, int dataoff, Q931 *q931) |
1058 | { |
1059 | H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; |
1060 | int i; |
1061 | int ret = 0; |
1062 | |
1063 | switch (pdu->h323_message_body.choice) { |
1064 | case eH323_UU_PDU_h323_message_body_setup: |
1065 | ret = process_setup(skb, ct, ctinfo, data, dataoff, |
1066 | &pdu->h323_message_body.setup); |
1067 | break; |
1068 | case eH323_UU_PDU_h323_message_body_callProceeding: |
1069 | ret = process_callproceeding(skb, ct, ctinfo, data, dataoff, |
1070 | &pdu->h323_message_body. |
1071 | callProceeding); |
1072 | break; |
1073 | case eH323_UU_PDU_h323_message_body_connect: |
1074 | ret = process_connect(skb, ct, ctinfo, data, dataoff, |
1075 | &pdu->h323_message_body.connect); |
1076 | break; |
1077 | case eH323_UU_PDU_h323_message_body_alerting: |
1078 | ret = process_alerting(skb, ct, ctinfo, data, dataoff, |
1079 | &pdu->h323_message_body.alerting); |
1080 | break; |
1081 | case eH323_UU_PDU_h323_message_body_facility: |
1082 | ret = process_facility(skb, ct, ctinfo, data, dataoff, |
1083 | &pdu->h323_message_body.facility); |
1084 | break; |
1085 | case eH323_UU_PDU_h323_message_body_progress: |
1086 | ret = process_progress(skb, ct, ctinfo, data, dataoff, |
1087 | &pdu->h323_message_body.progress); |
1088 | break; |
1089 | default: |
1090 | pr_debug("nf_ct_q931: Q.931 signal %d\n", |
1091 | pdu->h323_message_body.choice); |
1092 | break; |
1093 | } |
1094 | |
1095 | if (ret < 0) |
1096 | return -1; |
1097 | |
1098 | if (pdu->options & eH323_UU_PDU_h245Control) { |
1099 | for (i = 0; i < pdu->h245Control.count; i++) { |
1100 | ret = process_h245(skb, ct, ctinfo, data, dataoff, |
1101 | &pdu->h245Control.item[i]); |
1102 | if (ret < 0) |
1103 | return -1; |
1104 | } |
1105 | } |
1106 | |
1107 | return 0; |
1108 | } |
1109 | |
1110 | /****************************************************************************/ |
1111 | static int q931_help(struct sk_buff *skb, unsigned int protoff, |
1112 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
1113 | { |
1114 | static Q931 q931; |
1115 | unsigned char *data = NULL; |
1116 | int datalen; |
1117 | int dataoff; |
1118 | int ret; |
1119 | |
1120 | /* Until there's been traffic both ways, don't look in packets. */ |
1121 | if (ctinfo != IP_CT_ESTABLISHED && |
1122 | ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) { |
1123 | return NF_ACCEPT; |
1124 | } |
1125 | pr_debug("nf_ct_q931: skblen = %u\n", skb->len); |
1126 | |
1127 | spin_lock_bh(&nf_h323_lock); |
1128 | |
1129 | /* Process each TPKT */ |
1130 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
1131 | &data, &datalen, &dataoff)) { |
1132 | pr_debug("nf_ct_q931: TPKT len=%d ", datalen); |
1133 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
1134 | |
1135 | /* Decode Q.931 signal */ |
1136 | ret = DecodeQ931(data, datalen, &q931); |
1137 | if (ret < 0) { |
1138 | pr_debug("nf_ct_q931: decoding error: %s\n", |
1139 | ret == H323_ERROR_BOUND ? |
1140 | "out of bound" : "out of range"); |
1141 | /* We don't drop when decoding error */ |
1142 | break; |
1143 | } |
1144 | |
1145 | /* Process Q.931 signal */ |
1146 | if (process_q931(skb, ct, ctinfo, &data, dataoff, &q931) < 0) |
1147 | goto drop; |
1148 | } |
1149 | |
1150 | spin_unlock_bh(&nf_h323_lock); |
1151 | return NF_ACCEPT; |
1152 | |
1153 | drop: |
1154 | spin_unlock_bh(&nf_h323_lock); |
1155 | if (net_ratelimit()) |
1156 | printk("nf_ct_q931: packet dropped\n"); |
1157 | return NF_DROP; |
1158 | } |
1159 | |
1160 | /****************************************************************************/ |
1161 | static const struct nf_conntrack_expect_policy q931_exp_policy = { |
1162 | /* T.120 and H.245 */ |
1163 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, |
1164 | .timeout = 240, |
1165 | }; |
1166 | |
1167 | static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { |
1168 | { |
1169 | .name = "Q.931", |
1170 | .me = THIS_MODULE, |
1171 | .tuple.src.l3num = AF_INET, |
1172 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
1173 | .tuple.dst.protonum = IPPROTO_TCP, |
1174 | .help = q931_help, |
1175 | .expect_policy = &q931_exp_policy, |
1176 | }, |
1177 | { |
1178 | .name = "Q.931", |
1179 | .me = THIS_MODULE, |
1180 | .tuple.src.l3num = AF_INET6, |
1181 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
1182 | .tuple.dst.protonum = IPPROTO_TCP, |
1183 | .help = q931_help, |
1184 | .expect_policy = &q931_exp_policy, |
1185 | }, |
1186 | }; |
1187 | |
1188 | /****************************************************************************/ |
1189 | static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff, |
1190 | int *datalen) |
1191 | { |
1192 | const struct udphdr *uh; |
1193 | struct udphdr _uh; |
1194 | int dataoff; |
1195 | |
1196 | uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh); |
1197 | if (uh == NULL) |
1198 | return NULL; |
1199 | dataoff = protoff + sizeof(_uh); |
1200 | if (dataoff >= skb->len) |
1201 | return NULL; |
1202 | *datalen = skb->len - dataoff; |
1203 | return skb_header_pointer(skb, dataoff, *datalen, h323_buffer); |
1204 | } |
1205 | |
1206 | /****************************************************************************/ |
1207 | static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, |
1208 | union nf_inet_addr *addr, |
1209 | __be16 port) |
1210 | { |
1211 | struct net *net = nf_ct_net(ct); |
1212 | struct nf_conntrack_expect *exp; |
1213 | struct nf_conntrack_tuple tuple; |
1214 | |
1215 | memset(&tuple.src.u3, 0, sizeof(tuple.src.u3)); |
1216 | tuple.src.u.tcp.port = 0; |
1217 | memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3)); |
1218 | tuple.dst.u.tcp.port = port; |
1219 | tuple.dst.protonum = IPPROTO_TCP; |
1220 | |
1221 | exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple); |
1222 | if (exp && exp->master == ct) |
1223 | return exp; |
1224 | return NULL; |
1225 | } |
1226 | |
1227 | /****************************************************************************/ |
1228 | static int set_expect_timeout(struct nf_conntrack_expect *exp, |
1229 | unsigned timeout) |
1230 | { |
1231 | if (!exp || !del_timer(&exp->timeout)) |
1232 | return 0; |
1233 | |
1234 | exp->timeout.expires = jiffies + timeout * HZ; |
1235 | add_timer(&exp->timeout); |
1236 | |
1237 | return 1; |
1238 | } |
1239 | |
1240 | /****************************************************************************/ |
1241 | static int expect_q931(struct sk_buff *skb, struct nf_conn *ct, |
1242 | enum ip_conntrack_info ctinfo, |
1243 | unsigned char **data, |
1244 | TransportAddress *taddr, int count) |
1245 | { |
1246 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
1247 | int dir = CTINFO2DIR(ctinfo); |
1248 | int ret = 0; |
1249 | int i; |
1250 | __be16 port; |
1251 | union nf_inet_addr addr; |
1252 | struct nf_conntrack_expect *exp; |
1253 | typeof(nat_q931_hook) nat_q931; |
1254 | |
1255 | /* Look for the first related address */ |
1256 | for (i = 0; i < count; i++) { |
1257 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && |
1258 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, |
1259 | sizeof(addr)) == 0 && port != 0) |
1260 | break; |
1261 | } |
1262 | |
1263 | if (i >= count) /* Not found */ |
1264 | return 0; |
1265 | |
1266 | /* Create expect for Q.931 */ |
1267 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
1268 | return -1; |
1269 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
1270 | gkrouted_only ? /* only accept calls from GK? */ |
1271 | &ct->tuplehash[!dir].tuple.src.u3 : NULL, |
1272 | &ct->tuplehash[!dir].tuple.dst.u3, |
1273 | IPPROTO_TCP, NULL, &port); |
1274 | exp->helper = nf_conntrack_helper_q931; |
1275 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ |
1276 | |
1277 | nat_q931 = rcu_dereference(nat_q931_hook); |
1278 | if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */ |
1279 | ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp); |
1280 | } else { /* Conntrack only */ |
1281 | if (nf_ct_expect_related(exp) == 0) { |
1282 | pr_debug("nf_ct_ras: expect Q.931 "); |
1283 | nf_ct_dump_tuple(&exp->tuple); |
1284 | |
1285 | /* Save port for looking up expect in processing RCF */ |
1286 | info->sig_port[dir] = port; |
1287 | } else |
1288 | ret = -1; |
1289 | } |
1290 | |
1291 | nf_ct_expect_put(exp); |
1292 | |
1293 | return ret; |
1294 | } |
1295 | |
1296 | /****************************************************************************/ |
1297 | static int process_grq(struct sk_buff *skb, struct nf_conn *ct, |
1298 | enum ip_conntrack_info ctinfo, |
1299 | unsigned char **data, GatekeeperRequest *grq) |
1300 | { |
1301 | typeof(set_ras_addr_hook) set_ras_addr; |
1302 | |
1303 | pr_debug("nf_ct_ras: GRQ\n"); |
1304 | |
1305 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
1306 | if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */ |
1307 | return set_ras_addr(skb, ct, ctinfo, data, |
1308 | &grq->rasAddress, 1); |
1309 | return 0; |
1310 | } |
1311 | |
1312 | /****************************************************************************/ |
1313 | static int process_gcf(struct sk_buff *skb, struct nf_conn *ct, |
1314 | enum ip_conntrack_info ctinfo, |
1315 | unsigned char **data, GatekeeperConfirm *gcf) |
1316 | { |
1317 | int dir = CTINFO2DIR(ctinfo); |
1318 | int ret = 0; |
1319 | __be16 port; |
1320 | union nf_inet_addr addr; |
1321 | struct nf_conntrack_expect *exp; |
1322 | |
1323 | pr_debug("nf_ct_ras: GCF\n"); |
1324 | |
1325 | if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) |
1326 | return 0; |
1327 | |
1328 | /* Registration port is the same as discovery port */ |
1329 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
1330 | port == ct->tuplehash[dir].tuple.src.u.udp.port) |
1331 | return 0; |
1332 | |
1333 | /* Avoid RAS expectation loops. A GCF is never expected. */ |
1334 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) |
1335 | return 0; |
1336 | |
1337 | /* Need new expect */ |
1338 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
1339 | return -1; |
1340 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
1341 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1342 | IPPROTO_UDP, NULL, &port); |
1343 | exp->helper = nf_conntrack_helper_ras; |
1344 | |
1345 | if (nf_ct_expect_related(exp) == 0) { |
1346 | pr_debug("nf_ct_ras: expect RAS "); |
1347 | nf_ct_dump_tuple(&exp->tuple); |
1348 | } else |
1349 | ret = -1; |
1350 | |
1351 | nf_ct_expect_put(exp); |
1352 | |
1353 | return ret; |
1354 | } |
1355 | |
1356 | /****************************************************************************/ |
1357 | static int process_rrq(struct sk_buff *skb, struct nf_conn *ct, |
1358 | enum ip_conntrack_info ctinfo, |
1359 | unsigned char **data, RegistrationRequest *rrq) |
1360 | { |
1361 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
1362 | int ret; |
1363 | typeof(set_ras_addr_hook) set_ras_addr; |
1364 | |
1365 | pr_debug("nf_ct_ras: RRQ\n"); |
1366 | |
1367 | ret = expect_q931(skb, ct, ctinfo, data, |
1368 | rrq->callSignalAddress.item, |
1369 | rrq->callSignalAddress.count); |
1370 | if (ret < 0) |
1371 | return -1; |
1372 | |
1373 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
1374 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { |
1375 | ret = set_ras_addr(skb, ct, ctinfo, data, |
1376 | rrq->rasAddress.item, |
1377 | rrq->rasAddress.count); |
1378 | if (ret < 0) |
1379 | return -1; |
1380 | } |
1381 | |
1382 | if (rrq->options & eRegistrationRequest_timeToLive) { |
1383 | pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); |
1384 | info->timeout = rrq->timeToLive; |
1385 | } else |
1386 | info->timeout = default_rrq_ttl; |
1387 | |
1388 | return 0; |
1389 | } |
1390 | |
1391 | /****************************************************************************/ |
1392 | static int process_rcf(struct sk_buff *skb, struct nf_conn *ct, |
1393 | enum ip_conntrack_info ctinfo, |
1394 | unsigned char **data, RegistrationConfirm *rcf) |
1395 | { |
1396 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
1397 | int dir = CTINFO2DIR(ctinfo); |
1398 | int ret; |
1399 | struct nf_conntrack_expect *exp; |
1400 | typeof(set_sig_addr_hook) set_sig_addr; |
1401 | |
1402 | pr_debug("nf_ct_ras: RCF\n"); |
1403 | |
1404 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
1405 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { |
1406 | ret = set_sig_addr(skb, ct, ctinfo, data, |
1407 | rcf->callSignalAddress.item, |
1408 | rcf->callSignalAddress.count); |
1409 | if (ret < 0) |
1410 | return -1; |
1411 | } |
1412 | |
1413 | if (rcf->options & eRegistrationConfirm_timeToLive) { |
1414 | pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); |
1415 | info->timeout = rcf->timeToLive; |
1416 | } |
1417 | |
1418 | if (info->timeout > 0) { |
1419 | pr_debug("nf_ct_ras: set RAS connection timeout to " |
1420 | "%u seconds\n", info->timeout); |
1421 | nf_ct_refresh(ct, skb, info->timeout * HZ); |
1422 | |
1423 | /* Set expect timeout */ |
1424 | spin_lock_bh(&nf_conntrack_lock); |
1425 | exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, |
1426 | info->sig_port[!dir]); |
1427 | if (exp) { |
1428 | pr_debug("nf_ct_ras: set Q.931 expect " |
1429 | "timeout to %u seconds for", |
1430 | info->timeout); |
1431 | nf_ct_dump_tuple(&exp->tuple); |
1432 | set_expect_timeout(exp, info->timeout); |
1433 | } |
1434 | spin_unlock_bh(&nf_conntrack_lock); |
1435 | } |
1436 | |
1437 | return 0; |
1438 | } |
1439 | |
1440 | /****************************************************************************/ |
1441 | static int process_urq(struct sk_buff *skb, struct nf_conn *ct, |
1442 | enum ip_conntrack_info ctinfo, |
1443 | unsigned char **data, UnregistrationRequest *urq) |
1444 | { |
1445 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
1446 | int dir = CTINFO2DIR(ctinfo); |
1447 | int ret; |
1448 | typeof(set_sig_addr_hook) set_sig_addr; |
1449 | |
1450 | pr_debug("nf_ct_ras: URQ\n"); |
1451 | |
1452 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
1453 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { |
1454 | ret = set_sig_addr(skb, ct, ctinfo, data, |
1455 | urq->callSignalAddress.item, |
1456 | urq->callSignalAddress.count); |
1457 | if (ret < 0) |
1458 | return -1; |
1459 | } |
1460 | |
1461 | /* Clear old expect */ |
1462 | nf_ct_remove_expectations(ct); |
1463 | info->sig_port[dir] = 0; |
1464 | info->sig_port[!dir] = 0; |
1465 | |
1466 | /* Give it 30 seconds for UCF or URJ */ |
1467 | nf_ct_refresh(ct, skb, 30 * HZ); |
1468 | |
1469 | return 0; |
1470 | } |
1471 | |
1472 | /****************************************************************************/ |
1473 | static int process_arq(struct sk_buff *skb, struct nf_conn *ct, |
1474 | enum ip_conntrack_info ctinfo, |
1475 | unsigned char **data, AdmissionRequest *arq) |
1476 | { |
1477 | const struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
1478 | int dir = CTINFO2DIR(ctinfo); |
1479 | __be16 port; |
1480 | union nf_inet_addr addr; |
1481 | typeof(set_h225_addr_hook) set_h225_addr; |
1482 | |
1483 | pr_debug("nf_ct_ras: ARQ\n"); |
1484 | |
1485 | set_h225_addr = rcu_dereference(set_h225_addr_hook); |
1486 | if ((arq->options & eAdmissionRequest_destCallSignalAddress) && |
1487 | get_h225_addr(ct, *data, &arq->destCallSignalAddress, |
1488 | &addr, &port) && |
1489 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
1490 | port == info->sig_port[dir] && |
1491 | set_h225_addr && ct->status & IPS_NAT_MASK) { |
1492 | /* Answering ARQ */ |
1493 | return set_h225_addr(skb, data, 0, |
1494 | &arq->destCallSignalAddress, |
1495 | &ct->tuplehash[!dir].tuple.dst.u3, |
1496 | info->sig_port[!dir]); |
1497 | } |
1498 | |
1499 | if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && |
1500 | get_h225_addr(ct, *data, &arq->srcCallSignalAddress, |
1501 | &addr, &port) && |
1502 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
1503 | set_h225_addr && ct->status & IPS_NAT_MASK) { |
1504 | /* Calling ARQ */ |
1505 | return set_h225_addr(skb, data, 0, |
1506 | &arq->srcCallSignalAddress, |
1507 | &ct->tuplehash[!dir].tuple.dst.u3, |
1508 | port); |
1509 | } |
1510 | |
1511 | return 0; |
1512 | } |
1513 | |
1514 | /****************************************************************************/ |
1515 | static int process_acf(struct sk_buff *skb, struct nf_conn *ct, |
1516 | enum ip_conntrack_info ctinfo, |
1517 | unsigned char **data, AdmissionConfirm *acf) |
1518 | { |
1519 | int dir = CTINFO2DIR(ctinfo); |
1520 | int ret = 0; |
1521 | __be16 port; |
1522 | union nf_inet_addr addr; |
1523 | struct nf_conntrack_expect *exp; |
1524 | typeof(set_sig_addr_hook) set_sig_addr; |
1525 | |
1526 | pr_debug("nf_ct_ras: ACF\n"); |
1527 | |
1528 | if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, |
1529 | &addr, &port)) |
1530 | return 0; |
1531 | |
1532 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { |
1533 | /* Answering ACF */ |
1534 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
1535 | if (set_sig_addr && ct->status & IPS_NAT_MASK) |
1536 | return set_sig_addr(skb, ct, ctinfo, data, |
1537 | &acf->destCallSignalAddress, 1); |
1538 | return 0; |
1539 | } |
1540 | |
1541 | /* Need new expect */ |
1542 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
1543 | return -1; |
1544 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
1545 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1546 | IPPROTO_TCP, NULL, &port); |
1547 | exp->flags = NF_CT_EXPECT_PERMANENT; |
1548 | exp->helper = nf_conntrack_helper_q931; |
1549 | |
1550 | if (nf_ct_expect_related(exp) == 0) { |
1551 | pr_debug("nf_ct_ras: expect Q.931 "); |
1552 | nf_ct_dump_tuple(&exp->tuple); |
1553 | } else |
1554 | ret = -1; |
1555 | |
1556 | nf_ct_expect_put(exp); |
1557 | |
1558 | return ret; |
1559 | } |
1560 | |
1561 | /****************************************************************************/ |
1562 | static int process_lrq(struct sk_buff *skb, struct nf_conn *ct, |
1563 | enum ip_conntrack_info ctinfo, |
1564 | unsigned char **data, LocationRequest *lrq) |
1565 | { |
1566 | typeof(set_ras_addr_hook) set_ras_addr; |
1567 | |
1568 | pr_debug("nf_ct_ras: LRQ\n"); |
1569 | |
1570 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
1571 | if (set_ras_addr && ct->status & IPS_NAT_MASK) |
1572 | return set_ras_addr(skb, ct, ctinfo, data, |
1573 | &lrq->replyAddress, 1); |
1574 | return 0; |
1575 | } |
1576 | |
1577 | /****************************************************************************/ |
1578 | static int process_lcf(struct sk_buff *skb, struct nf_conn *ct, |
1579 | enum ip_conntrack_info ctinfo, |
1580 | unsigned char **data, LocationConfirm *lcf) |
1581 | { |
1582 | int dir = CTINFO2DIR(ctinfo); |
1583 | int ret = 0; |
1584 | __be16 port; |
1585 | union nf_inet_addr addr; |
1586 | struct nf_conntrack_expect *exp; |
1587 | |
1588 | pr_debug("nf_ct_ras: LCF\n"); |
1589 | |
1590 | if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, |
1591 | &addr, &port)) |
1592 | return 0; |
1593 | |
1594 | /* Need new expect for call signal */ |
1595 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
1596 | return -1; |
1597 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
1598 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1599 | IPPROTO_TCP, NULL, &port); |
1600 | exp->flags = NF_CT_EXPECT_PERMANENT; |
1601 | exp->helper = nf_conntrack_helper_q931; |
1602 | |
1603 | if (nf_ct_expect_related(exp) == 0) { |
1604 | pr_debug("nf_ct_ras: expect Q.931 "); |
1605 | nf_ct_dump_tuple(&exp->tuple); |
1606 | } else |
1607 | ret = -1; |
1608 | |
1609 | nf_ct_expect_put(exp); |
1610 | |
1611 | /* Ignore rasAddress */ |
1612 | |
1613 | return ret; |
1614 | } |
1615 | |
1616 | /****************************************************************************/ |
1617 | static int process_irr(struct sk_buff *skb, struct nf_conn *ct, |
1618 | enum ip_conntrack_info ctinfo, |
1619 | unsigned char **data, InfoRequestResponse *irr) |
1620 | { |
1621 | int ret; |
1622 | typeof(set_ras_addr_hook) set_ras_addr; |
1623 | typeof(set_sig_addr_hook) set_sig_addr; |
1624 | |
1625 | pr_debug("nf_ct_ras: IRR\n"); |
1626 | |
1627 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
1628 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { |
1629 | ret = set_ras_addr(skb, ct, ctinfo, data, |
1630 | &irr->rasAddress, 1); |
1631 | if (ret < 0) |
1632 | return -1; |
1633 | } |
1634 | |
1635 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
1636 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { |
1637 | ret = set_sig_addr(skb, ct, ctinfo, data, |
1638 | irr->callSignalAddress.item, |
1639 | irr->callSignalAddress.count); |
1640 | if (ret < 0) |
1641 | return -1; |
1642 | } |
1643 | |
1644 | return 0; |
1645 | } |
1646 | |
1647 | /****************************************************************************/ |
1648 | static int process_ras(struct sk_buff *skb, struct nf_conn *ct, |
1649 | enum ip_conntrack_info ctinfo, |
1650 | unsigned char **data, RasMessage *ras) |
1651 | { |
1652 | switch (ras->choice) { |
1653 | case eRasMessage_gatekeeperRequest: |
1654 | return process_grq(skb, ct, ctinfo, data, |
1655 | &ras->gatekeeperRequest); |
1656 | case eRasMessage_gatekeeperConfirm: |
1657 | return process_gcf(skb, ct, ctinfo, data, |
1658 | &ras->gatekeeperConfirm); |
1659 | case eRasMessage_registrationRequest: |
1660 | return process_rrq(skb, ct, ctinfo, data, |
1661 | &ras->registrationRequest); |
1662 | case eRasMessage_registrationConfirm: |
1663 | return process_rcf(skb, ct, ctinfo, data, |
1664 | &ras->registrationConfirm); |
1665 | case eRasMessage_unregistrationRequest: |
1666 | return process_urq(skb, ct, ctinfo, data, |
1667 | &ras->unregistrationRequest); |
1668 | case eRasMessage_admissionRequest: |
1669 | return process_arq(skb, ct, ctinfo, data, |
1670 | &ras->admissionRequest); |
1671 | case eRasMessage_admissionConfirm: |
1672 | return process_acf(skb, ct, ctinfo, data, |
1673 | &ras->admissionConfirm); |
1674 | case eRasMessage_locationRequest: |
1675 | return process_lrq(skb, ct, ctinfo, data, |
1676 | &ras->locationRequest); |
1677 | case eRasMessage_locationConfirm: |
1678 | return process_lcf(skb, ct, ctinfo, data, |
1679 | &ras->locationConfirm); |
1680 | case eRasMessage_infoRequestResponse: |
1681 | return process_irr(skb, ct, ctinfo, data, |
1682 | &ras->infoRequestResponse); |
1683 | default: |
1684 | pr_debug("nf_ct_ras: RAS message %d\n", ras->choice); |
1685 | break; |
1686 | } |
1687 | |
1688 | return 0; |
1689 | } |
1690 | |
1691 | /****************************************************************************/ |
1692 | static int ras_help(struct sk_buff *skb, unsigned int protoff, |
1693 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
1694 | { |
1695 | static RasMessage ras; |
1696 | unsigned char *data; |
1697 | int datalen = 0; |
1698 | int ret; |
1699 | |
1700 | pr_debug("nf_ct_ras: skblen = %u\n", skb->len); |
1701 | |
1702 | spin_lock_bh(&nf_h323_lock); |
1703 | |
1704 | /* Get UDP data */ |
1705 | data = get_udp_data(skb, protoff, &datalen); |
1706 | if (data == NULL) |
1707 | goto accept; |
1708 | pr_debug("nf_ct_ras: RAS message len=%d ", datalen); |
1709 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
1710 | |
1711 | /* Decode RAS message */ |
1712 | ret = DecodeRasMessage(data, datalen, &ras); |
1713 | if (ret < 0) { |
1714 | pr_debug("nf_ct_ras: decoding error: %s\n", |
1715 | ret == H323_ERROR_BOUND ? |
1716 | "out of bound" : "out of range"); |
1717 | goto accept; |
1718 | } |
1719 | |
1720 | /* Process RAS message */ |
1721 | if (process_ras(skb, ct, ctinfo, &data, &ras) < 0) |
1722 | goto drop; |
1723 | |
1724 | accept: |
1725 | spin_unlock_bh(&nf_h323_lock); |
1726 | return NF_ACCEPT; |
1727 | |
1728 | drop: |
1729 | spin_unlock_bh(&nf_h323_lock); |
1730 | if (net_ratelimit()) |
1731 | printk("nf_ct_ras: packet dropped\n"); |
1732 | return NF_DROP; |
1733 | } |
1734 | |
1735 | /****************************************************************************/ |
1736 | static const struct nf_conntrack_expect_policy ras_exp_policy = { |
1737 | .max_expected = 32, |
1738 | .timeout = 240, |
1739 | }; |
1740 | |
1741 | static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { |
1742 | { |
1743 | .name = "RAS", |
1744 | .me = THIS_MODULE, |
1745 | .tuple.src.l3num = AF_INET, |
1746 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
1747 | .tuple.dst.protonum = IPPROTO_UDP, |
1748 | .help = ras_help, |
1749 | .expect_policy = &ras_exp_policy, |
1750 | }, |
1751 | { |
1752 | .name = "RAS", |
1753 | .me = THIS_MODULE, |
1754 | .tuple.src.l3num = AF_INET6, |
1755 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
1756 | .tuple.dst.protonum = IPPROTO_UDP, |
1757 | .help = ras_help, |
1758 | .expect_policy = &ras_exp_policy, |
1759 | }, |
1760 | }; |
1761 | |
1762 | /****************************************************************************/ |
1763 | static void __exit nf_conntrack_h323_fini(void) |
1764 | { |
1765 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]); |
1766 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); |
1767 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); |
1768 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); |
1769 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); |
1770 | kfree(h323_buffer); |
1771 | pr_debug("nf_ct_h323: fini\n"); |
1772 | } |
1773 | |
1774 | /****************************************************************************/ |
1775 | static int __init nf_conntrack_h323_init(void) |
1776 | { |
1777 | int ret; |
1778 | |
1779 | h323_buffer = kmalloc(65536, GFP_KERNEL); |
1780 | if (!h323_buffer) |
1781 | return -ENOMEM; |
1782 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245); |
1783 | if (ret < 0) |
1784 | goto err1; |
1785 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]); |
1786 | if (ret < 0) |
1787 | goto err2; |
1788 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]); |
1789 | if (ret < 0) |
1790 | goto err3; |
1791 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]); |
1792 | if (ret < 0) |
1793 | goto err4; |
1794 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]); |
1795 | if (ret < 0) |
1796 | goto err5; |
1797 | pr_debug("nf_ct_h323: init success\n"); |
1798 | return 0; |
1799 | |
1800 | err5: |
1801 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); |
1802 | err4: |
1803 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); |
1804 | err3: |
1805 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); |
1806 | err2: |
1807 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); |
1808 | err1: |
1809 | kfree(h323_buffer); |
1810 | return ret; |
1811 | } |
1812 | |
1813 | /****************************************************************************/ |
1814 | module_init(nf_conntrack_h323_init); |
1815 | module_exit(nf_conntrack_h323_fini); |
1816 | |
1817 | EXPORT_SYMBOL_GPL(get_h225_addr); |
1818 | EXPORT_SYMBOL_GPL(set_h245_addr_hook); |
1819 | EXPORT_SYMBOL_GPL(set_h225_addr_hook); |
1820 | EXPORT_SYMBOL_GPL(set_sig_addr_hook); |
1821 | EXPORT_SYMBOL_GPL(set_ras_addr_hook); |
1822 | EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); |
1823 | EXPORT_SYMBOL_GPL(nat_t120_hook); |
1824 | EXPORT_SYMBOL_GPL(nat_h245_hook); |
1825 | EXPORT_SYMBOL_GPL(nat_callforwarding_hook); |
1826 | EXPORT_SYMBOL_GPL(nat_q931_hook); |
1827 | |
1828 | MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); |
1829 | MODULE_DESCRIPTION("H.323 connection tracking helper"); |
1830 | MODULE_LICENSE("GPL"); |
1831 | MODULE_ALIAS("ip_conntrack_h323"); |
1832 | MODULE_ALIAS_NFCT_HELPER("h323"); |
1833 |
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Tags:
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od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9