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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/udp.h> | |
21 | #include <linux/tcp.h> | |
22 | #include <linux/skbuff.h> | |
23 | #include <net/route.h> | |
24 | #include <net/ip6_route.h> | |
25 | ||
26 | #include <net/netfilter/nf_conntrack.h> | |
27 | #include <net/netfilter/nf_conntrack_core.h> | |
28 | #include <net/netfilter/nf_conntrack_tuple.h> | |
29 | #include <net/netfilter/nf_conntrack_expect.h> | |
30 | #include <net/netfilter/nf_conntrack_ecache.h> | |
31 | #include <net/netfilter/nf_conntrack_helper.h> | |
32 | #include <linux/netfilter/nf_conntrack_h323.h> | |
33 | ||
34 | #if 0 | |
35 | #define DEBUGP printk | |
36 | #else | |
37 | #define DEBUGP(format, args...) | |
38 | #endif | |
39 | ||
40 | /* Parameters */ | |
41 | static unsigned int default_rrq_ttl __read_mostly = 300; | |
42 | module_param(default_rrq_ttl, uint, 0600); | |
43 | MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ"); | |
44 | ||
45 | static int gkrouted_only __read_mostly = 1; | |
46 | module_param(gkrouted_only, int, 0600); | |
47 | MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper"); | |
48 | ||
49 | static int callforward_filter __read_mostly = 1; | |
50 | module_param(callforward_filter, bool, 0600); | |
51 | MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations " | |
52 | "if both endpoints are on different sides " | |
53 | "(determined by routing information)"); | |
54 | ||
55 | /* Hooks for NAT */ | |
56 | int (*set_h245_addr_hook) (struct sk_buff **pskb, | |
57 | unsigned char **data, int dataoff, | |
58 | H245_TransportAddress *taddr, | |
59 | union nf_conntrack_address *addr, __be16 port) | |
60 | __read_mostly; | |
61 | int (*set_h225_addr_hook) (struct sk_buff **pskb, | |
62 | unsigned char **data, int dataoff, | |
63 | TransportAddress *taddr, | |
64 | union nf_conntrack_address *addr, __be16 port) | |
65 | __read_mostly; | |
66 | int (*set_sig_addr_hook) (struct sk_buff **pskb, | |
67 | struct nf_conn *ct, | |
68 | enum ip_conntrack_info ctinfo, | |
69 | unsigned char **data, | |
70 | TransportAddress *taddr, int count) __read_mostly; | |
71 | int (*set_ras_addr_hook) (struct sk_buff **pskb, | |
72 | struct nf_conn *ct, | |
73 | enum ip_conntrack_info ctinfo, | |
74 | unsigned char **data, | |
75 | TransportAddress *taddr, int count) __read_mostly; | |
76 | int (*nat_rtp_rtcp_hook) (struct sk_buff **pskb, | |
77 | struct nf_conn *ct, | |
78 | enum ip_conntrack_info ctinfo, | |
79 | unsigned char **data, int dataoff, | |
80 | H245_TransportAddress *taddr, | |
81 | __be16 port, __be16 rtp_port, | |
82 | struct nf_conntrack_expect *rtp_exp, | |
83 | struct nf_conntrack_expect *rtcp_exp) __read_mostly; | |
84 | int (*nat_t120_hook) (struct sk_buff **pskb, | |
85 | struct nf_conn *ct, | |
86 | enum ip_conntrack_info ctinfo, | |
87 | unsigned char **data, int dataoff, | |
88 | H245_TransportAddress *taddr, __be16 port, | |
89 | struct nf_conntrack_expect *exp) __read_mostly; | |
90 | int (*nat_h245_hook) (struct sk_buff **pskb, | |
91 | struct nf_conn *ct, | |
92 | enum ip_conntrack_info ctinfo, | |
93 | unsigned char **data, int dataoff, | |
94 | TransportAddress *taddr, __be16 port, | |
95 | struct nf_conntrack_expect *exp) __read_mostly; | |
96 | int (*nat_callforwarding_hook) (struct sk_buff **pskb, | |
97 | struct nf_conn *ct, | |
98 | enum ip_conntrack_info ctinfo, | |
99 | unsigned char **data, int dataoff, | |
100 | TransportAddress *taddr, __be16 port, | |
101 | struct nf_conntrack_expect *exp) __read_mostly; | |
102 | int (*nat_q931_hook) (struct sk_buff **pskb, | |
103 | struct nf_conn *ct, | |
104 | enum ip_conntrack_info ctinfo, | |
105 | unsigned char **data, TransportAddress *taddr, int idx, | |
106 | __be16 port, struct nf_conntrack_expect *exp) | |
107 | __read_mostly; | |
108 | ||
109 | static DEFINE_SPINLOCK(nf_h323_lock); | |
110 | static char *h323_buffer; | |
111 | ||
112 | static struct nf_conntrack_helper nf_conntrack_helper_h245; | |
113 | static struct nf_conntrack_helper nf_conntrack_helper_q931[]; | |
114 | static struct nf_conntrack_helper nf_conntrack_helper_ras[]; | |
115 | ||
116 | /****************************************************************************/ | |
117 | static int get_tpkt_data(struct sk_buff **pskb, unsigned int protoff, | |
118 | struct nf_conn *ct, enum ip_conntrack_info ctinfo, | |
119 | unsigned char **data, int *datalen, int *dataoff) | |
120 | { | |
121 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
122 | int dir = CTINFO2DIR(ctinfo); | |
123 | struct tcphdr _tcph, *th; | |
124 | int tcpdatalen; | |
125 | int tcpdataoff; | |
126 | unsigned char *tpkt; | |
127 | int tpktlen; | |
128 | int tpktoff; | |
129 | ||
130 | /* Get TCP header */ | |
131 | th = skb_header_pointer(*pskb, protoff, sizeof(_tcph), &_tcph); | |
132 | if (th == NULL) | |
133 | return 0; | |
134 | ||
135 | /* Get TCP data offset */ | |
136 | tcpdataoff = protoff + th->doff * 4; | |
137 | ||
138 | /* Get TCP data length */ | |
139 | tcpdatalen = (*pskb)->len - tcpdataoff; | |
140 | if (tcpdatalen <= 0) /* No TCP data */ | |
141 | goto clear_out; | |
142 | ||
143 | if (*data == NULL) { /* first TPKT */ | |
144 | /* Get first TPKT pointer */ | |
145 | tpkt = skb_header_pointer(*pskb, tcpdataoff, tcpdatalen, | |
146 | h323_buffer); | |
147 | BUG_ON(tpkt == NULL); | |
148 | ||
149 | /* Validate TPKT identifier */ | |
150 | if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) { | |
151 | /* Netmeeting sends TPKT header and data separately */ | |
152 | if (info->tpkt_len[dir] > 0) { | |
153 | DEBUGP("nf_ct_h323: previous packet " | |
154 | "indicated separate TPKT data of %hu " | |
155 | "bytes\n", info->tpkt_len[dir]); | |
156 | if (info->tpkt_len[dir] <= tcpdatalen) { | |
157 | /* Yes, there was a TPKT header | |
158 | * received */ | |
159 | *data = tpkt; | |
160 | *datalen = info->tpkt_len[dir]; | |
161 | *dataoff = 0; | |
162 | goto out; | |
163 | } | |
164 | ||
165 | /* Fragmented TPKT */ | |
166 | if (net_ratelimit()) | |
167 | printk("nf_ct_h323: " | |
168 | "fragmented TPKT\n"); | |
169 | goto clear_out; | |
170 | } | |
171 | ||
172 | /* It is not even a TPKT */ | |
173 | return 0; | |
174 | } | |
175 | tpktoff = 0; | |
176 | } else { /* Next TPKT */ | |
177 | tpktoff = *dataoff + *datalen; | |
178 | tcpdatalen -= tpktoff; | |
179 | if (tcpdatalen <= 4) /* No more TPKT */ | |
180 | goto clear_out; | |
181 | tpkt = *data + *datalen; | |
182 | ||
183 | /* Validate TPKT identifier */ | |
184 | if (tpkt[0] != 0x03 || tpkt[1] != 0) | |
185 | goto clear_out; | |
186 | } | |
187 | ||
188 | /* Validate TPKT length */ | |
189 | tpktlen = tpkt[2] * 256 + tpkt[3]; | |
190 | if (tpktlen < 4) | |
191 | goto clear_out; | |
192 | if (tpktlen > tcpdatalen) { | |
193 | if (tcpdatalen == 4) { /* Separate TPKT header */ | |
194 | /* Netmeeting sends TPKT header and data separately */ | |
195 | DEBUGP("nf_ct_h323: separate TPKT header indicates " | |
196 | "there will be TPKT data of %hu bytes\n", | |
197 | tpktlen - 4); | |
198 | info->tpkt_len[dir] = tpktlen - 4; | |
199 | return 0; | |
200 | } | |
201 | ||
202 | if (net_ratelimit()) | |
203 | printk("nf_ct_h323: incomplete TPKT (fragmented?)\n"); | |
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 | /****************************************************************************/ | |
223 | static int get_h245_addr(struct nf_conn *ct, unsigned char *data, | |
224 | H245_TransportAddress *taddr, | |
225 | union nf_conntrack_address *addr, __be16 *port) | |
226 | { | |
227 | unsigned char *p; | |
228 | int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
229 | int len; | |
230 | ||
231 | if (taddr->choice != eH245_TransportAddress_unicastAddress) | |
232 | return 0; | |
233 | ||
234 | switch (taddr->unicastAddress.choice) { | |
235 | case eUnicastAddress_iPAddress: | |
236 | if (family != AF_INET) | |
237 | return 0; | |
238 | p = data + taddr->unicastAddress.iPAddress.network; | |
239 | len = 4; | |
240 | break; | |
241 | case eUnicastAddress_iP6Address: | |
242 | if (family != AF_INET6) | |
243 | return 0; | |
244 | p = data + taddr->unicastAddress.iP6Address.network; | |
245 | len = 16; | |
246 | break; | |
247 | default: | |
248 | return 0; | |
249 | } | |
250 | ||
251 | memcpy(addr, p, len); | |
252 | memset((void *)addr + len, 0, sizeof(*addr) - len); | |
253 | memcpy(port, p + len, sizeof(__be16)); | |
254 | ||
255 | return 1; | |
256 | } | |
257 | ||
258 | /****************************************************************************/ | |
259 | static int expect_rtp_rtcp(struct sk_buff **pskb, struct nf_conn *ct, | |
260 | enum ip_conntrack_info ctinfo, | |
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; | |
268 | union nf_conntrack_address addr; | |
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 */ | |
280 | port &= htons(~1); | |
281 | rtp_port = port; | |
282 | rtcp_port = htons(ntohs(port) + 1); | |
283 | ||
284 | /* Create expect for RTP */ | |
285 | if ((rtp_exp = nf_conntrack_expect_alloc(ct)) == NULL) | |
286 | return -1; | |
287 | nf_conntrack_expect_init(rtp_exp, ct->tuplehash[!dir].tuple.src.l3num, | |
288 | &ct->tuplehash[!dir].tuple.src.u3, | |
289 | &ct->tuplehash[!dir].tuple.dst.u3, | |
290 | IPPROTO_UDP, NULL, &rtp_port); | |
291 | ||
292 | /* Create expect for RTCP */ | |
293 | if ((rtcp_exp = nf_conntrack_expect_alloc(ct)) == NULL) { | |
294 | nf_conntrack_expect_put(rtp_exp); | |
295 | return -1; | |
296 | } | |
297 | nf_conntrack_expect_init(rtcp_exp, ct->tuplehash[!dir].tuple.src.l3num, | |
298 | &ct->tuplehash[!dir].tuple.src.u3, | |
299 | &ct->tuplehash[!dir].tuple.dst.u3, | |
300 | IPPROTO_UDP, NULL, &rtcp_port); | |
301 | ||
302 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
303 | &ct->tuplehash[!dir].tuple.dst.u3, | |
304 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
305 | (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) && | |
306 | ct->status & IPS_NAT_MASK) { | |
307 | /* NAT needed */ | |
308 | ret = nat_rtp_rtcp(pskb, ct, ctinfo, data, dataoff, | |
309 | taddr, port, rtp_port, rtp_exp, rtcp_exp); | |
310 | } else { /* Conntrack only */ | |
311 | if (nf_conntrack_expect_related(rtp_exp) == 0) { | |
312 | if (nf_conntrack_expect_related(rtcp_exp) == 0) { | |
313 | DEBUGP("nf_ct_h323: expect RTP "); | |
314 | NF_CT_DUMP_TUPLE(&rtp_exp->tuple); | |
315 | DEBUGP("nf_ct_h323: expect RTCP "); | |
316 | NF_CT_DUMP_TUPLE(&rtcp_exp->tuple); | |
317 | } else { | |
318 | nf_conntrack_unexpect_related(rtp_exp); | |
319 | ret = -1; | |
320 | } | |
321 | } else | |
322 | ret = -1; | |
323 | } | |
324 | ||
325 | nf_conntrack_expect_put(rtp_exp); | |
326 | nf_conntrack_expect_put(rtcp_exp); | |
327 | ||
328 | return ret; | |
329 | } | |
330 | ||
331 | /****************************************************************************/ | |
332 | static int expect_t120(struct sk_buff **pskb, | |
333 | struct nf_conn *ct, | |
334 | enum ip_conntrack_info ctinfo, | |
335 | unsigned char **data, int dataoff, | |
336 | H245_TransportAddress *taddr) | |
337 | { | |
338 | int dir = CTINFO2DIR(ctinfo); | |
339 | int ret = 0; | |
340 | __be16 port; | |
341 | union nf_conntrack_address addr; | |
342 | struct nf_conntrack_expect *exp; | |
343 | typeof(nat_t120_hook) nat_t120; | |
344 | ||
345 | /* Read T.120 address */ | |
346 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || | |
347 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
348 | port == 0) | |
349 | return 0; | |
350 | ||
351 | /* Create expect for T.120 connections */ | |
352 | if ((exp = nf_conntrack_expect_alloc(ct)) == NULL) | |
353 | return -1; | |
354 | nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, | |
355 | &ct->tuplehash[!dir].tuple.src.u3, | |
356 | &ct->tuplehash[!dir].tuple.dst.u3, | |
357 | IPPROTO_TCP, NULL, &port); | |
358 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */ | |
359 | ||
360 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
361 | &ct->tuplehash[!dir].tuple.dst.u3, | |
362 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
363 | (nat_t120 = rcu_dereference(nat_t120_hook)) && | |
364 | ct->status & IPS_NAT_MASK) { | |
365 | /* NAT needed */ | |
366 | ret = nat_t120(pskb, ct, ctinfo, data, dataoff, taddr, | |
367 | port, exp); | |
368 | } else { /* Conntrack only */ | |
369 | if (nf_conntrack_expect_related(exp) == 0) { | |
370 | DEBUGP("nf_ct_h323: expect T.120 "); | |
371 | NF_CT_DUMP_TUPLE(&exp->tuple); | |
372 | } else | |
373 | ret = -1; | |
374 | } | |
375 | ||
376 | nf_conntrack_expect_put(exp); | |
377 | ||
378 | return ret; | |
379 | } | |
380 | ||
381 | /****************************************************************************/ | |
382 | static int process_h245_channel(struct sk_buff **pskb, | |
383 | struct nf_conn *ct, | |
384 | enum ip_conntrack_info ctinfo, | |
385 | unsigned char **data, int dataoff, | |
386 | H2250LogicalChannelParameters *channel) | |
387 | { | |
388 | int ret; | |
389 | ||
390 | if (channel->options & eH2250LogicalChannelParameters_mediaChannel) { | |
391 | /* RTP */ | |
392 | ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff, | |
393 | &channel->mediaChannel); | |
394 | if (ret < 0) | |
395 | return -1; | |
396 | } | |
397 | ||
398 | if (channel-> | |
399 | options & eH2250LogicalChannelParameters_mediaControlChannel) { | |
400 | /* RTCP */ | |
401 | ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff, | |
402 | &channel->mediaControlChannel); | |
403 | if (ret < 0) | |
404 | return -1; | |
405 | } | |
406 | ||
407 | return 0; | |
408 | } | |
409 | ||
410 | /****************************************************************************/ | |
411 | static int process_olc(struct sk_buff **pskb, struct nf_conn *ct, | |
412 | enum ip_conntrack_info ctinfo, | |
413 | unsigned char **data, int dataoff, | |
414 | OpenLogicalChannel *olc) | |
415 | { | |
416 | int ret; | |
417 | ||
418 | DEBUGP("nf_ct_h323: OpenLogicalChannel\n"); | |
419 | ||
420 | if (olc->forwardLogicalChannelParameters.multiplexParameters.choice == | |
421 | eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters) | |
422 | { | |
423 | ret = process_h245_channel(pskb, ct, ctinfo, data, dataoff, | |
424 | &olc-> | |
425 | forwardLogicalChannelParameters. | |
426 | multiplexParameters. | |
427 | h2250LogicalChannelParameters); | |
428 | if (ret < 0) | |
429 | return -1; | |
430 | } | |
431 | ||
432 | if ((olc->options & | |
433 | eOpenLogicalChannel_reverseLogicalChannelParameters) && | |
434 | (olc->reverseLogicalChannelParameters.options & | |
435 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters) | |
436 | && (olc->reverseLogicalChannelParameters.multiplexParameters. | |
437 | choice == | |
438 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) | |
439 | { | |
440 | ret = | |
441 | process_h245_channel(pskb, ct, ctinfo, data, dataoff, | |
442 | &olc-> | |
443 | reverseLogicalChannelParameters. | |
444 | multiplexParameters. | |
445 | h2250LogicalChannelParameters); | |
446 | if (ret < 0) | |
447 | return -1; | |
448 | } | |
449 | ||
450 | if ((olc->options & eOpenLogicalChannel_separateStack) && | |
451 | olc->forwardLogicalChannelParameters.dataType.choice == | |
452 | eDataType_data && | |
453 | olc->forwardLogicalChannelParameters.dataType.data.application. | |
454 | choice == eDataApplicationCapability_application_t120 && | |
455 | olc->forwardLogicalChannelParameters.dataType.data.application. | |
456 | t120.choice == eDataProtocolCapability_separateLANStack && | |
457 | olc->separateStack.networkAddress.choice == | |
458 | eNetworkAccessParameters_networkAddress_localAreaAddress) { | |
459 | ret = expect_t120(pskb, ct, ctinfo, data, dataoff, | |
460 | &olc->separateStack.networkAddress. | |
461 | localAreaAddress); | |
462 | if (ret < 0) | |
463 | return -1; | |
464 | } | |
465 | ||
466 | return 0; | |
467 | } | |
468 | ||
469 | /****************************************************************************/ | |
470 | static int process_olca(struct sk_buff **pskb, struct nf_conn *ct, | |
471 | enum ip_conntrack_info ctinfo, | |
472 | unsigned char **data, int dataoff, | |
473 | OpenLogicalChannelAck *olca) | |
474 | { | |
475 | H2250LogicalChannelAckParameters *ack; | |
476 | int ret; | |
477 | ||
478 | DEBUGP("nf_ct_h323: OpenLogicalChannelAck\n"); | |
479 | ||
480 | if ((olca->options & | |
481 | eOpenLogicalChannelAck_reverseLogicalChannelParameters) && | |
482 | (olca->reverseLogicalChannelParameters.options & | |
483 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters) | |
484 | && (olca->reverseLogicalChannelParameters.multiplexParameters. | |
485 | choice == | |
486 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) | |
487 | { | |
488 | ret = process_h245_channel(pskb, ct, ctinfo, data, dataoff, | |
489 | &olca-> | |
490 | reverseLogicalChannelParameters. | |
491 | multiplexParameters. | |
492 | h2250LogicalChannelParameters); | |
493 | if (ret < 0) | |
494 | return -1; | |
495 | } | |
496 | ||
497 | if ((olca->options & | |
498 | eOpenLogicalChannelAck_forwardMultiplexAckParameters) && | |
499 | (olca->forwardMultiplexAckParameters.choice == | |
500 | eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters)) | |
501 | { | |
502 | ack = &olca->forwardMultiplexAckParameters. | |
503 | h2250LogicalChannelAckParameters; | |
504 | if (ack->options & | |
505 | eH2250LogicalChannelAckParameters_mediaChannel) { | |
506 | /* RTP */ | |
507 | ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff, | |
508 | &ack->mediaChannel); | |
509 | if (ret < 0) | |
510 | return -1; | |
511 | } | |
512 | ||
513 | if (ack->options & | |
514 | eH2250LogicalChannelAckParameters_mediaControlChannel) { | |
515 | /* RTCP */ | |
516 | ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff, | |
517 | &ack->mediaControlChannel); | |
518 | if (ret < 0) | |
519 | return -1; | |
520 | } | |
521 | } | |
522 | ||
523 | return 0; | |
524 | } | |
525 | ||
526 | /****************************************************************************/ | |
527 | static int process_h245(struct sk_buff **pskb, struct nf_conn *ct, | |
528 | enum ip_conntrack_info ctinfo, | |
529 | unsigned char **data, int dataoff, | |
530 | MultimediaSystemControlMessage *mscm) | |
531 | { | |
532 | switch (mscm->choice) { | |
533 | case eMultimediaSystemControlMessage_request: | |
534 | if (mscm->request.choice == | |
535 | eRequestMessage_openLogicalChannel) { | |
536 | return process_olc(pskb, ct, ctinfo, data, dataoff, | |
537 | &mscm->request.openLogicalChannel); | |
538 | } | |
539 | DEBUGP("nf_ct_h323: H.245 Request %d\n", | |
540 | mscm->request.choice); | |
541 | break; | |
542 | case eMultimediaSystemControlMessage_response: | |
543 | if (mscm->response.choice == | |
544 | eResponseMessage_openLogicalChannelAck) { | |
545 | return process_olca(pskb, ct, ctinfo, data, dataoff, | |
546 | &mscm->response. | |
547 | openLogicalChannelAck); | |
548 | } | |
549 | DEBUGP("nf_ct_h323: H.245 Response %d\n", | |
550 | mscm->response.choice); | |
551 | break; | |
552 | default: | |
553 | DEBUGP("nf_ct_h323: H.245 signal %d\n", mscm->choice); | |
554 | break; | |
555 | } | |
556 | ||
557 | return 0; | |
558 | } | |
559 | ||
560 | /****************************************************************************/ | |
561 | static int h245_help(struct sk_buff **pskb, unsigned int protoff, | |
562 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) | |
563 | { | |
564 | static MultimediaSystemControlMessage mscm; | |
565 | unsigned char *data = NULL; | |
566 | int datalen; | |
567 | int dataoff; | |
568 | int ret; | |
569 | ||
570 | /* Until there's been traffic both ways, don't look in packets. */ | |
571 | if (ctinfo != IP_CT_ESTABLISHED && | |
572 | ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) { | |
573 | return NF_ACCEPT; | |
574 | } | |
575 | DEBUGP("nf_ct_h245: skblen = %u\n", (*pskb)->len); | |
576 | ||
577 | spin_lock_bh(&nf_h323_lock); | |
578 | ||
579 | /* Process each TPKT */ | |
580 | while (get_tpkt_data(pskb, protoff, ct, ctinfo, | |
581 | &data, &datalen, &dataoff)) { | |
582 | DEBUGP("nf_ct_h245: TPKT len=%d ", datalen); | |
583 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); | |
584 | ||
585 | /* Decode H.245 signal */ | |
586 | ret = DecodeMultimediaSystemControlMessage(data, datalen, | |
587 | &mscm); | |
588 | if (ret < 0) { | |
589 | if (net_ratelimit()) | |
590 | printk("nf_ct_h245: decoding error: %s\n", | |
591 | ret == H323_ERROR_BOUND ? | |
592 | "out of bound" : "out of range"); | |
593 | /* We don't drop when decoding error */ | |
594 | break; | |
595 | } | |
596 | ||
597 | /* Process H.245 signal */ | |
598 | if (process_h245(pskb, ct, ctinfo, &data, dataoff, &mscm) < 0) | |
599 | goto drop; | |
600 | } | |
601 | ||
602 | spin_unlock_bh(&nf_h323_lock); | |
603 | return NF_ACCEPT; | |
604 | ||
605 | drop: | |
606 | spin_unlock_bh(&nf_h323_lock); | |
607 | if (net_ratelimit()) | |
608 | printk("nf_ct_h245: packet dropped\n"); | |
609 | return NF_DROP; | |
610 | } | |
611 | ||
612 | /****************************************************************************/ | |
613 | static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { | |
614 | .name = "H.245", | |
615 | .me = THIS_MODULE, | |
616 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */, | |
617 | .timeout = 240, | |
618 | .tuple.dst.protonum = IPPROTO_UDP, | |
619 | .mask.src.u.udp.port = __constant_htons(0xFFFF), | |
620 | .mask.dst.protonum = 0xFF, | |
621 | .help = h245_help | |
622 | }; | |
623 | ||
624 | /****************************************************************************/ | |
625 | int get_h225_addr(struct nf_conn *ct, unsigned char *data, | |
626 | TransportAddress *taddr, | |
627 | union nf_conntrack_address *addr, __be16 *port) | |
628 | { | |
629 | unsigned char *p; | |
630 | int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
631 | int len; | |
632 | ||
633 | switch (taddr->choice) { | |
634 | case eTransportAddress_ipAddress: | |
635 | if (family != AF_INET) | |
636 | return 0; | |
637 | p = data + taddr->ipAddress.ip; | |
638 | len = 4; | |
639 | break; | |
640 | case eTransportAddress_ip6Address: | |
641 | if (family != AF_INET6) | |
642 | return 0; | |
643 | p = data + taddr->ip6Address.ip6; | |
644 | len = 16; | |
645 | break; | |
646 | default: | |
647 | return 0; | |
648 | } | |
649 | ||
650 | memcpy(addr, p, len); | |
651 | memset((void *)addr + len, 0, sizeof(*addr) - len); | |
652 | memcpy(port, p + len, sizeof(__be16)); | |
653 | ||
654 | return 1; | |
655 | } | |
656 | ||
657 | /****************************************************************************/ | |
658 | static int expect_h245(struct sk_buff **pskb, struct nf_conn *ct, | |
659 | enum ip_conntrack_info ctinfo, | |
660 | unsigned char **data, int dataoff, | |
661 | TransportAddress *taddr) | |
662 | { | |
663 | int dir = CTINFO2DIR(ctinfo); | |
664 | int ret = 0; | |
665 | __be16 port; | |
666 | union nf_conntrack_address addr; | |
667 | struct nf_conntrack_expect *exp; | |
668 | typeof(nat_h245_hook) nat_h245; | |
669 | ||
670 | /* Read h245Address */ | |
671 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || | |
672 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
673 | port == 0) | |
674 | return 0; | |
675 | ||
676 | /* Create expect for h245 connection */ | |
677 | if ((exp = nf_conntrack_expect_alloc(ct)) == NULL) | |
678 | return -1; | |
679 | nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, | |
680 | &ct->tuplehash[!dir].tuple.src.u3, | |
681 | &ct->tuplehash[!dir].tuple.dst.u3, | |
682 | IPPROTO_TCP, NULL, &port); | |
683 | exp->helper = &nf_conntrack_helper_h245; | |
684 | ||
685 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
686 | &ct->tuplehash[!dir].tuple.dst.u3, | |
687 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
688 | (nat_h245 = rcu_dereference(nat_h245_hook)) && | |
689 | ct->status & IPS_NAT_MASK) { | |
690 | /* NAT needed */ | |
691 | ret = nat_h245(pskb, ct, ctinfo, data, dataoff, taddr, | |
692 | port, exp); | |
693 | } else { /* Conntrack only */ | |
694 | if (nf_conntrack_expect_related(exp) == 0) { | |
695 | DEBUGP("nf_ct_q931: expect H.245 "); | |
696 | NF_CT_DUMP_TUPLE(&exp->tuple); | |
697 | } else | |
698 | ret = -1; | |
699 | } | |
700 | ||
701 | nf_conntrack_expect_put(exp); | |
702 | ||
703 | return ret; | |
704 | } | |
705 | ||
706 | /* If the calling party is on the same side of the forward-to party, | |
707 | * we don't need to track the second call */ | |
708 | static int callforward_do_filter(union nf_conntrack_address *src, | |
709 | union nf_conntrack_address *dst, | |
710 | int family) | |
711 | { | |
712 | struct flowi fl1, fl2; | |
713 | int ret = 0; | |
714 | ||
715 | memset(&fl1, 0, sizeof(fl1)); | |
716 | memset(&fl2, 0, sizeof(fl2)); | |
717 | ||
718 | switch (family) { | |
719 | case AF_INET: { | |
720 | struct rtable *rt1, *rt2; | |
721 | ||
722 | fl1.fl4_dst = src->ip; | |
723 | fl2.fl4_dst = dst->ip; | |
724 | if (ip_route_output_key(&rt1, &fl1) == 0) { | |
725 | if (ip_route_output_key(&rt2, &fl2) == 0) { | |
726 | if (rt1->rt_gateway == rt2->rt_gateway && | |
727 | rt1->u.dst.dev == rt2->u.dst.dev) | |
728 | ret = 1; | |
729 | dst_release(&rt2->u.dst); | |
730 | } | |
731 | dst_release(&rt1->u.dst); | |
732 | } | |
733 | break; | |
734 | } | |
735 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
736 | case AF_INET6: { | |
737 | struct rt6_info *rt1, *rt2; | |
738 | ||
739 | memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst)); | |
740 | memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst)); | |
741 | rt1 = (struct rt6_info *)ip6_route_output(NULL, &fl1); | |
742 | if (rt1) { | |
743 | rt2 = (struct rt6_info *)ip6_route_output(NULL, &fl2); | |
744 | if (rt2) { | |
745 | if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway, | |
746 | sizeof(rt1->rt6i_gateway)) && | |
747 | rt1->u.dst.dev == rt2->u.dst.dev) | |
748 | ret = 1; | |
749 | dst_release(&rt2->u.dst); | |
750 | } | |
751 | dst_release(&rt1->u.dst); | |
752 | } | |
753 | break; | |
754 | } | |
755 | #endif | |
756 | } | |
757 | return ret; | |
758 | ||
759 | } | |
760 | ||
761 | /****************************************************************************/ | |
762 | static int expect_callforwarding(struct sk_buff **pskb, | |
763 | struct nf_conn *ct, | |
764 | enum ip_conntrack_info ctinfo, | |
765 | unsigned char **data, int dataoff, | |
766 | TransportAddress *taddr) | |
767 | { | |
768 | int dir = CTINFO2DIR(ctinfo); | |
769 | int ret = 0; | |
770 | __be16 port; | |
771 | union nf_conntrack_address addr; | |
772 | struct nf_conntrack_expect *exp; | |
773 | typeof(nat_callforwarding_hook) nat_callforwarding; | |
774 | ||
775 | /* Read alternativeAddress */ | |
776 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) | |
777 | return 0; | |
778 | ||
779 | /* If the calling party is on the same side of the forward-to party, | |
780 | * we don't need to track the second call */ | |
781 | if (callforward_filter && | |
782 | callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3, | |
783 | ct->tuplehash[!dir].tuple.src.l3num)) { | |
784 | DEBUGP("nf_ct_q931: Call Forwarding not tracked\n"); | |
785 | return 0; | |
786 | } | |
787 | ||
788 | /* Create expect for the second call leg */ | |
789 | if ((exp = nf_conntrack_expect_alloc(ct)) == NULL) | |
790 | return -1; | |
791 | nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, | |
792 | &ct->tuplehash[!dir].tuple.src.u3, &addr, | |
793 | IPPROTO_TCP, NULL, &port); | |
794 | exp->helper = nf_conntrack_helper_q931; | |
795 | ||
796 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
797 | &ct->tuplehash[!dir].tuple.dst.u3, | |
798 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
799 | (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && | |
800 | ct->status & IPS_NAT_MASK) { | |
801 | /* Need NAT */ | |
802 | ret = nat_callforwarding(pskb, ct, ctinfo, data, dataoff, | |
803 | taddr, port, exp); | |
804 | } else { /* Conntrack only */ | |
805 | if (nf_conntrack_expect_related(exp) == 0) { | |
806 | DEBUGP("nf_ct_q931: expect Call Forwarding "); | |
807 | NF_CT_DUMP_TUPLE(&exp->tuple); | |
808 | } else | |
809 | ret = -1; | |
810 | } | |
811 | ||
812 | nf_conntrack_expect_put(exp); | |
813 | ||
814 | return ret; | |
815 | } | |
816 | ||
817 | /****************************************************************************/ | |
818 | static int process_setup(struct sk_buff **pskb, struct nf_conn *ct, | |
819 | enum ip_conntrack_info ctinfo, | |
820 | unsigned char **data, int dataoff, | |
821 | Setup_UUIE *setup) | |
822 | { | |
823 | int dir = CTINFO2DIR(ctinfo); | |
824 | int ret; | |
825 | int i; | |
826 | __be16 port; | |
827 | union nf_conntrack_address addr; | |
828 | typeof(set_h225_addr_hook) set_h225_addr; | |
829 | ||
830 | DEBUGP("nf_ct_q931: Setup\n"); | |
831 | ||
832 | if (setup->options & eSetup_UUIE_h245Address) { | |
833 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, | |
834 | &setup->h245Address); | |
835 | if (ret < 0) | |
836 | return -1; | |
837 | } | |
838 | ||
839 | set_h225_addr = rcu_dereference(set_h225_addr_hook); | |
840 | if ((setup->options & eSetup_UUIE_destCallSignalAddress) && | |
841 | (set_h225_addr) && ct->status && IPS_NAT_MASK && | |
842 | get_h225_addr(ct, *data, &setup->destCallSignalAddress, | |
843 | &addr, &port) && | |
844 | memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { | |
845 | DEBUGP("nf_ct_q931: set destCallSignalAddress " | |
846 | NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n", | |
847 | NIP6(*(struct in6_addr *)&addr), ntohs(port), | |
848 | NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.src.u3), | |
849 | ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port)); | |
850 | ret = set_h225_addr(pskb, data, dataoff, | |
851 | &setup->destCallSignalAddress, | |
852 | &ct->tuplehash[!dir].tuple.src.u3, | |
853 | ct->tuplehash[!dir].tuple.src.u.tcp.port); | |
854 | if (ret < 0) | |
855 | return -1; | |
856 | } | |
857 | ||
858 | if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && | |
859 | (set_h225_addr) && ct->status & IPS_NAT_MASK && | |
860 | get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, | |
861 | &addr, &port) && | |
862 | memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { | |
863 | DEBUGP("nf_ct_q931: set sourceCallSignalAddress " | |
864 | NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n", | |
865 | NIP6(*(struct in6_addr *)&addr), ntohs(port), | |
866 | NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.dst.u3), | |
867 | ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); | |
868 | ret = set_h225_addr(pskb, data, dataoff, | |
869 | &setup->sourceCallSignalAddress, | |
870 | &ct->tuplehash[!dir].tuple.dst.u3, | |
871 | ct->tuplehash[!dir].tuple.dst.u.tcp.port); | |
872 | if (ret < 0) | |
873 | return -1; | |
874 | } | |
875 | ||
876 | if (setup->options & eSetup_UUIE_fastStart) { | |
877 | for (i = 0; i < setup->fastStart.count; i++) { | |
878 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, | |
879 | &setup->fastStart.item[i]); | |
880 | if (ret < 0) | |
881 | return -1; | |
882 | } | |
883 | } | |
884 | ||
885 | return 0; | |
886 | } | |
887 | ||
888 | /****************************************************************************/ | |
889 | static int process_callproceeding(struct sk_buff **pskb, | |
890 | struct nf_conn *ct, | |
891 | enum ip_conntrack_info ctinfo, | |
892 | unsigned char **data, int dataoff, | |
893 | CallProceeding_UUIE *callproc) | |
894 | { | |
895 | int ret; | |
896 | int i; | |
897 | ||
898 | DEBUGP("nf_ct_q931: CallProceeding\n"); | |
899 | ||
900 | if (callproc->options & eCallProceeding_UUIE_h245Address) { | |
901 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, | |
902 | &callproc->h245Address); | |
903 | if (ret < 0) | |
904 | return -1; | |
905 | } | |
906 | ||
907 | if (callproc->options & eCallProceeding_UUIE_fastStart) { | |
908 | for (i = 0; i < callproc->fastStart.count; i++) { | |
909 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, | |
910 | &callproc->fastStart.item[i]); | |
911 | if (ret < 0) | |
912 | return -1; | |
913 | } | |
914 | } | |
915 | ||
916 | return 0; | |
917 | } | |
918 | ||
919 | /****************************************************************************/ | |
920 | static int process_connect(struct sk_buff **pskb, struct nf_conn *ct, | |
921 | enum ip_conntrack_info ctinfo, | |
922 | unsigned char **data, int dataoff, | |
923 | Connect_UUIE *connect) | |
924 | { | |
925 | int ret; | |
926 | int i; | |
927 | ||
928 | DEBUGP("nf_ct_q931: Connect\n"); | |
929 | ||
930 | if (connect->options & eConnect_UUIE_h245Address) { | |
931 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, | |
932 | &connect->h245Address); | |
933 | if (ret < 0) | |
934 | return -1; | |
935 | } | |
936 | ||
937 | if (connect->options & eConnect_UUIE_fastStart) { | |
938 | for (i = 0; i < connect->fastStart.count; i++) { | |
939 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, | |
940 | &connect->fastStart.item[i]); | |
941 | if (ret < 0) | |
942 | return -1; | |
943 | } | |
944 | } | |
945 | ||
946 | return 0; | |
947 | } | |
948 | ||
949 | /****************************************************************************/ | |
950 | static int process_alerting(struct sk_buff **pskb, struct nf_conn *ct, | |
951 | enum ip_conntrack_info ctinfo, | |
952 | unsigned char **data, int dataoff, | |
953 | Alerting_UUIE *alert) | |
954 | { | |
955 | int ret; | |
956 | int i; | |
957 | ||
958 | DEBUGP("nf_ct_q931: Alerting\n"); | |
959 | ||
960 | if (alert->options & eAlerting_UUIE_h245Address) { | |
961 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, | |
962 | &alert->h245Address); | |
963 | if (ret < 0) | |
964 | return -1; | |
965 | } | |
966 | ||
967 | if (alert->options & eAlerting_UUIE_fastStart) { | |
968 | for (i = 0; i < alert->fastStart.count; i++) { | |
969 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, | |
970 | &alert->fastStart.item[i]); | |
971 | if (ret < 0) | |
972 | return -1; | |
973 | } | |
974 | } | |
975 | ||
976 | return 0; | |
977 | } | |
978 | ||
979 | /****************************************************************************/ | |
980 | static int process_information(struct sk_buff **pskb, | |
981 | struct nf_conn *ct, | |
982 | enum ip_conntrack_info ctinfo, | |
983 | unsigned char **data, int dataoff, | |
984 | Information_UUIE *info) | |
985 | { | |
986 | int ret; | |
987 | int i; | |
988 | ||
989 | DEBUGP("nf_ct_q931: Information\n"); | |
990 | ||
991 | if (info->options & eInformation_UUIE_fastStart) { | |
992 | for (i = 0; i < info->fastStart.count; i++) { | |
993 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, | |
994 | &info->fastStart.item[i]); | |
995 | if (ret < 0) | |
996 | return -1; | |
997 | } | |
998 | } | |
999 | ||
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | /****************************************************************************/ | |
1004 | static int process_facility(struct sk_buff **pskb, struct nf_conn *ct, | |
1005 | enum ip_conntrack_info ctinfo, | |
1006 | unsigned char **data, int dataoff, | |
1007 | Facility_UUIE *facility) | |
1008 | { | |
1009 | int ret; | |
1010 | int i; | |
1011 | ||
1012 | DEBUGP("nf_ct_q931: Facility\n"); | |
1013 | ||
1014 | if (facility->reason.choice == eFacilityReason_callForwarded) { | |
1015 | if (facility->options & eFacility_UUIE_alternativeAddress) | |
1016 | return expect_callforwarding(pskb, ct, ctinfo, data, | |
1017 | dataoff, | |
1018 | &facility-> | |
1019 | alternativeAddress); | |
1020 | return 0; | |
1021 | } | |
1022 | ||
1023 | if (facility->options & eFacility_UUIE_h245Address) { | |
1024 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, | |
1025 | &facility->h245Address); | |
1026 | if (ret < 0) | |
1027 | return -1; | |
1028 | } | |
1029 | ||
1030 | if (facility->options & eFacility_UUIE_fastStart) { | |
1031 | for (i = 0; i < facility->fastStart.count; i++) { | |
1032 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, | |
1033 | &facility->fastStart.item[i]); | |
1034 | if (ret < 0) | |
1035 | return -1; | |
1036 | } | |
1037 | } | |
1038 | ||
1039 | return 0; | |
1040 | } | |
1041 | ||
1042 | /****************************************************************************/ | |
1043 | static int process_progress(struct sk_buff **pskb, struct nf_conn *ct, | |
1044 | enum ip_conntrack_info ctinfo, | |
1045 | unsigned char **data, int dataoff, | |
1046 | Progress_UUIE *progress) | |
1047 | { | |
1048 | int ret; | |
1049 | int i; | |
1050 | ||
1051 | DEBUGP("nf_ct_q931: Progress\n"); | |
1052 | ||
1053 | if (progress->options & eProgress_UUIE_h245Address) { | |
1054 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, | |
1055 | &progress->h245Address); | |
1056 | if (ret < 0) | |
1057 | return -1; | |
1058 | } | |
1059 | ||
1060 | if (progress->options & eProgress_UUIE_fastStart) { | |
1061 | for (i = 0; i < progress->fastStart.count; i++) { | |
1062 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, | |
1063 | &progress->fastStart.item[i]); | |
1064 | if (ret < 0) | |
1065 | return -1; | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | return 0; | |
1070 | } | |
1071 | ||
1072 | /****************************************************************************/ | |
1073 | static int process_q931(struct sk_buff **pskb, struct nf_conn *ct, | |
1074 | enum ip_conntrack_info ctinfo, | |
1075 | unsigned char **data, int dataoff, Q931 *q931) | |
1076 | { | |
1077 | H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; | |
1078 | int i; | |
1079 | int ret = 0; | |
1080 | ||
1081 | switch (pdu->h323_message_body.choice) { | |
1082 | case eH323_UU_PDU_h323_message_body_setup: | |
1083 | ret = process_setup(pskb, ct, ctinfo, data, dataoff, | |
1084 | &pdu->h323_message_body.setup); | |
1085 | break; | |
1086 | case eH323_UU_PDU_h323_message_body_callProceeding: | |
1087 | ret = process_callproceeding(pskb, ct, ctinfo, data, dataoff, | |
1088 | &pdu->h323_message_body. | |
1089 | callProceeding); | |
1090 | break; | |
1091 | case eH323_UU_PDU_h323_message_body_connect: | |
1092 | ret = process_connect(pskb, ct, ctinfo, data, dataoff, | |
1093 | &pdu->h323_message_body.connect); | |
1094 | break; | |
1095 | case eH323_UU_PDU_h323_message_body_alerting: | |
1096 | ret = process_alerting(pskb, ct, ctinfo, data, dataoff, | |
1097 | &pdu->h323_message_body.alerting); | |
1098 | break; | |
1099 | case eH323_UU_PDU_h323_message_body_information: | |
1100 | ret = process_information(pskb, ct, ctinfo, data, dataoff, | |
1101 | &pdu->h323_message_body. | |
1102 | information); | |
1103 | break; | |
1104 | case eH323_UU_PDU_h323_message_body_facility: | |
1105 | ret = process_facility(pskb, ct, ctinfo, data, dataoff, | |
1106 | &pdu->h323_message_body.facility); | |
1107 | break; | |
1108 | case eH323_UU_PDU_h323_message_body_progress: | |
1109 | ret = process_progress(pskb, ct, ctinfo, data, dataoff, | |
1110 | &pdu->h323_message_body.progress); | |
1111 | break; | |
1112 | default: | |
1113 | DEBUGP("nf_ct_q931: Q.931 signal %d\n", | |
1114 | pdu->h323_message_body.choice); | |
1115 | break; | |
1116 | } | |
1117 | ||
1118 | if (ret < 0) | |
1119 | return -1; | |
1120 | ||
1121 | if (pdu->options & eH323_UU_PDU_h245Control) { | |
1122 | for (i = 0; i < pdu->h245Control.count; i++) { | |
1123 | ret = process_h245(pskb, ct, ctinfo, data, dataoff, | |
1124 | &pdu->h245Control.item[i]); | |
1125 | if (ret < 0) | |
1126 | return -1; | |
1127 | } | |
1128 | } | |
1129 | ||
1130 | return 0; | |
1131 | } | |
1132 | ||
1133 | /****************************************************************************/ | |
1134 | static int q931_help(struct sk_buff **pskb, unsigned int protoff, | |
1135 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) | |
1136 | { | |
1137 | static Q931 q931; | |
1138 | unsigned char *data = NULL; | |
1139 | int datalen; | |
1140 | int dataoff; | |
1141 | int ret; | |
1142 | ||
1143 | /* Until there's been traffic both ways, don't look in packets. */ | |
1144 | if (ctinfo != IP_CT_ESTABLISHED && | |
1145 | ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) { | |
1146 | return NF_ACCEPT; | |
1147 | } | |
1148 | DEBUGP("nf_ct_q931: skblen = %u\n", (*pskb)->len); | |
1149 | ||
1150 | spin_lock_bh(&nf_h323_lock); | |
1151 | ||
1152 | /* Process each TPKT */ | |
1153 | while (get_tpkt_data(pskb, protoff, ct, ctinfo, | |
1154 | &data, &datalen, &dataoff)) { | |
1155 | DEBUGP("nf_ct_q931: TPKT len=%d ", datalen); | |
1156 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); | |
1157 | ||
1158 | /* Decode Q.931 signal */ | |
1159 | ret = DecodeQ931(data, datalen, &q931); | |
1160 | if (ret < 0) { | |
1161 | if (net_ratelimit()) | |
1162 | printk("nf_ct_q931: decoding error: %s\n", | |
1163 | ret == H323_ERROR_BOUND ? | |
1164 | "out of bound" : "out of range"); | |
1165 | /* We don't drop when decoding error */ | |
1166 | break; | |
1167 | } | |
1168 | ||
1169 | /* Process Q.931 signal */ | |
1170 | if (process_q931(pskb, ct, ctinfo, &data, dataoff, &q931) < 0) | |
1171 | goto drop; | |
1172 | } | |
1173 | ||
1174 | spin_unlock_bh(&nf_h323_lock); | |
1175 | return NF_ACCEPT; | |
1176 | ||
1177 | drop: | |
1178 | spin_unlock_bh(&nf_h323_lock); | |
1179 | if (net_ratelimit()) | |
1180 | printk("nf_ct_q931: packet dropped\n"); | |
1181 | return NF_DROP; | |
1182 | } | |
1183 | ||
1184 | /****************************************************************************/ | |
1185 | static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { | |
1186 | { | |
1187 | .name = "Q.931", | |
1188 | .me = THIS_MODULE, | |
1189 | /* T.120 and H.245 */ | |
1190 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, | |
1191 | .timeout = 240, | |
1192 | .tuple.src.l3num = AF_INET, | |
1193 | .tuple.src.u.tcp.port = __constant_htons(Q931_PORT), | |
1194 | .tuple.dst.protonum = IPPROTO_TCP, | |
1195 | .mask.src.l3num = 0xFFFF, | |
1196 | .mask.src.u.tcp.port = __constant_htons(0xFFFF), | |
1197 | .mask.dst.protonum = 0xFF, | |
1198 | .help = q931_help | |
1199 | }, | |
1200 | { | |
1201 | .name = "Q.931", | |
1202 | .me = THIS_MODULE, | |
1203 | /* T.120 and H.245 */ | |
1204 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, | |
1205 | .timeout = 240, | |
1206 | .tuple.src.l3num = AF_INET6, | |
1207 | .tuple.src.u.tcp.port = __constant_htons(Q931_PORT), | |
1208 | .tuple.dst.protonum = IPPROTO_TCP, | |
1209 | .mask.src.l3num = 0xFFFF, | |
1210 | .mask.src.u.tcp.port = __constant_htons(0xFFFF), | |
1211 | .mask.dst.protonum = 0xFF, | |
1212 | .help = q931_help | |
1213 | }, | |
1214 | }; | |
1215 | ||
1216 | /****************************************************************************/ | |
1217 | static unsigned char *get_udp_data(struct sk_buff **pskb, unsigned int protoff, | |
1218 | int *datalen) | |
1219 | { | |
1220 | struct udphdr _uh, *uh; | |
1221 | int dataoff; | |
1222 | ||
1223 | uh = skb_header_pointer(*pskb, protoff, sizeof(_uh), &_uh); | |
1224 | if (uh == NULL) | |
1225 | return NULL; | |
1226 | dataoff = protoff + sizeof(_uh); | |
1227 | if (dataoff >= (*pskb)->len) | |
1228 | return NULL; | |
1229 | *datalen = (*pskb)->len - dataoff; | |
1230 | return skb_header_pointer(*pskb, dataoff, *datalen, h323_buffer); | |
1231 | } | |
1232 | ||
1233 | /****************************************************************************/ | |
1234 | static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, | |
1235 | union nf_conntrack_address *addr, | |
1236 | __be16 port) | |
1237 | { | |
1238 | struct nf_conntrack_expect *exp; | |
1239 | struct nf_conntrack_tuple tuple; | |
1240 | ||
1241 | memset(&tuple.src.u3, 0, sizeof(tuple.src.u3)); | |
1242 | tuple.src.u.tcp.port = 0; | |
1243 | memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3)); | |
1244 | tuple.dst.u.tcp.port = port; | |
1245 | tuple.dst.protonum = IPPROTO_TCP; | |
1246 | ||
1247 | exp = __nf_conntrack_expect_find(&tuple); | |
1248 | if (exp && exp->master == ct) | |
1249 | return exp; | |
1250 | return NULL; | |
1251 | } | |
1252 | ||
1253 | /****************************************************************************/ | |
1254 | static int set_expect_timeout(struct nf_conntrack_expect *exp, | |
1255 | unsigned timeout) | |
1256 | { | |
1257 | if (!exp || !del_timer(&exp->timeout)) | |
1258 | return 0; | |
1259 | ||
1260 | exp->timeout.expires = jiffies + timeout * HZ; | |
1261 | add_timer(&exp->timeout); | |
1262 | ||
1263 | return 1; | |
1264 | } | |
1265 | ||
1266 | /****************************************************************************/ | |
1267 | static int expect_q931(struct sk_buff **pskb, struct nf_conn *ct, | |
1268 | enum ip_conntrack_info ctinfo, | |
1269 | unsigned char **data, | |
1270 | TransportAddress *taddr, int count) | |
1271 | { | |
1272 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1273 | int dir = CTINFO2DIR(ctinfo); | |
1274 | int ret = 0; | |
1275 | int i; | |
1276 | __be16 port; | |
1277 | union nf_conntrack_address addr; | |
1278 | struct nf_conntrack_expect *exp; | |
1279 | typeof(nat_q931_hook) nat_q931; | |
1280 | ||
1281 | /* Look for the first related address */ | |
1282 | for (i = 0; i < count; i++) { | |
1283 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && | |
1284 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, | |
1285 | sizeof(addr)) == 0 && port != 0) | |
1286 | break; | |
1287 | } | |
1288 | ||
1289 | if (i >= count) /* Not found */ | |
1290 | return 0; | |
1291 | ||
1292 | /* Create expect for Q.931 */ | |
1293 | if ((exp = nf_conntrack_expect_alloc(ct)) == NULL) | |
1294 | return -1; | |
1295 | nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, | |
1296 | gkrouted_only ? /* only accept calls from GK? */ | |
1297 | &ct->tuplehash[!dir].tuple.src.u3 : | |
1298 | NULL, | |
1299 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1300 | IPPROTO_TCP, NULL, &port); | |
1301 | exp->helper = nf_conntrack_helper_q931; | |
1302 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ | |
1303 | ||
1304 | nat_q931 = rcu_dereference(nat_q931_hook); | |
1305 | if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */ | |
1306 | ret = nat_q931(pskb, ct, ctinfo, data, taddr, i, port, exp); | |
1307 | } else { /* Conntrack only */ | |
1308 | if (nf_conntrack_expect_related(exp) == 0) { | |
1309 | DEBUGP("nf_ct_ras: expect Q.931 "); | |
1310 | NF_CT_DUMP_TUPLE(&exp->tuple); | |
1311 | ||
1312 | /* Save port for looking up expect in processing RCF */ | |
1313 | info->sig_port[dir] = port; | |
1314 | } else | |
1315 | ret = -1; | |
1316 | } | |
1317 | ||
1318 | nf_conntrack_expect_put(exp); | |
1319 | ||
1320 | return ret; | |
1321 | } | |
1322 | ||
1323 | /****************************************************************************/ | |
1324 | static int process_grq(struct sk_buff **pskb, struct nf_conn *ct, | |
1325 | enum ip_conntrack_info ctinfo, | |
1326 | unsigned char **data, GatekeeperRequest *grq) | |
1327 | { | |
1328 | typeof(set_ras_addr_hook) set_ras_addr; | |
1329 | ||
1330 | DEBUGP("nf_ct_ras: GRQ\n"); | |
1331 | ||
1332 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1333 | if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */ | |
1334 | return set_ras_addr(pskb, ct, ctinfo, data, | |
1335 | &grq->rasAddress, 1); | |
1336 | return 0; | |
1337 | } | |
1338 | ||
1339 | /****************************************************************************/ | |
1340 | static int process_gcf(struct sk_buff **pskb, struct nf_conn *ct, | |
1341 | enum ip_conntrack_info ctinfo, | |
1342 | unsigned char **data, GatekeeperConfirm *gcf) | |
1343 | { | |
1344 | int dir = CTINFO2DIR(ctinfo); | |
1345 | int ret = 0; | |
1346 | __be16 port; | |
1347 | union nf_conntrack_address addr; | |
1348 | struct nf_conntrack_expect *exp; | |
1349 | ||
1350 | DEBUGP("nf_ct_ras: GCF\n"); | |
1351 | ||
1352 | if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) | |
1353 | return 0; | |
1354 | ||
1355 | /* Registration port is the same as discovery port */ | |
1356 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && | |
1357 | port == ct->tuplehash[dir].tuple.src.u.udp.port) | |
1358 | return 0; | |
1359 | ||
1360 | /* Avoid RAS expectation loops. A GCF is never expected. */ | |
1361 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) | |
1362 | return 0; | |
1363 | ||
1364 | /* Need new expect */ | |
1365 | if ((exp = nf_conntrack_expect_alloc(ct)) == NULL) | |
1366 | return -1; | |
1367 | nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, | |
1368 | &ct->tuplehash[!dir].tuple.src.u3, &addr, | |
1369 | IPPROTO_UDP, NULL, &port); | |
1370 | exp->helper = nf_conntrack_helper_ras; | |
1371 | ||
1372 | if (nf_conntrack_expect_related(exp) == 0) { | |
1373 | DEBUGP("nf_ct_ras: expect RAS "); | |
1374 | NF_CT_DUMP_TUPLE(&exp->tuple); | |
1375 | } else | |
1376 | ret = -1; | |
1377 | ||
1378 | nf_conntrack_expect_put(exp); | |
1379 | ||
1380 | return ret; | |
1381 | } | |
1382 | ||
1383 | /****************************************************************************/ | |
1384 | static int process_rrq(struct sk_buff **pskb, struct nf_conn *ct, | |
1385 | enum ip_conntrack_info ctinfo, | |
1386 | unsigned char **data, RegistrationRequest *rrq) | |
1387 | { | |
1388 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1389 | int ret; | |
1390 | typeof(set_ras_addr_hook) set_ras_addr; | |
1391 | ||
1392 | DEBUGP("nf_ct_ras: RRQ\n"); | |
1393 | ||
1394 | ret = expect_q931(pskb, ct, ctinfo, data, | |
1395 | rrq->callSignalAddress.item, | |
1396 | rrq->callSignalAddress.count); | |
1397 | if (ret < 0) | |
1398 | return -1; | |
1399 | ||
1400 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1401 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { | |
1402 | ret = set_ras_addr(pskb, ct, ctinfo, data, | |
1403 | rrq->rasAddress.item, | |
1404 | rrq->rasAddress.count); | |
1405 | if (ret < 0) | |
1406 | return -1; | |
1407 | } | |
1408 | ||
1409 | if (rrq->options & eRegistrationRequest_timeToLive) { | |
1410 | DEBUGP("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); | |
1411 | info->timeout = rrq->timeToLive; | |
1412 | } else | |
1413 | info->timeout = default_rrq_ttl; | |
1414 | ||
1415 | return 0; | |
1416 | } | |
1417 | ||
1418 | /****************************************************************************/ | |
1419 | static int process_rcf(struct sk_buff **pskb, struct nf_conn *ct, | |
1420 | enum ip_conntrack_info ctinfo, | |
1421 | unsigned char **data, RegistrationConfirm *rcf) | |
1422 | { | |
1423 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1424 | int dir = CTINFO2DIR(ctinfo); | |
1425 | int ret; | |
1426 | struct nf_conntrack_expect *exp; | |
1427 | typeof(set_sig_addr_hook) set_sig_addr; | |
1428 | ||
1429 | DEBUGP("nf_ct_ras: RCF\n"); | |
1430 | ||
1431 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1432 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
1433 | ret = set_sig_addr(pskb, ct, ctinfo, data, | |
1434 | rcf->callSignalAddress.item, | |
1435 | rcf->callSignalAddress.count); | |
1436 | if (ret < 0) | |
1437 | return -1; | |
1438 | } | |
1439 | ||
1440 | if (rcf->options & eRegistrationConfirm_timeToLive) { | |
1441 | DEBUGP("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); | |
1442 | info->timeout = rcf->timeToLive; | |
1443 | } | |
1444 | ||
1445 | if (info->timeout > 0) { | |
1446 | DEBUGP | |
1447 | ("nf_ct_ras: set RAS connection timeout to %u seconds\n", | |
1448 | info->timeout); | |
1449 | nf_ct_refresh(ct, *pskb, info->timeout * HZ); | |
1450 | ||
1451 | /* Set expect timeout */ | |
1452 | read_lock_bh(&nf_conntrack_lock); | |
1453 | exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, | |
1454 | info->sig_port[!dir]); | |
1455 | if (exp) { | |
1456 | DEBUGP("nf_ct_ras: set Q.931 expect " | |
1457 | "timeout to %u seconds for", | |
1458 | info->timeout); | |
1459 | NF_CT_DUMP_TUPLE(&exp->tuple); | |
1460 | set_expect_timeout(exp, info->timeout); | |
1461 | } | |
1462 | read_unlock_bh(&nf_conntrack_lock); | |
1463 | } | |
1464 | ||
1465 | return 0; | |
1466 | } | |
1467 | ||
1468 | /****************************************************************************/ | |
1469 | static int process_urq(struct sk_buff **pskb, struct nf_conn *ct, | |
1470 | enum ip_conntrack_info ctinfo, | |
1471 | unsigned char **data, UnregistrationRequest *urq) | |
1472 | { | |
1473 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1474 | int dir = CTINFO2DIR(ctinfo); | |
1475 | int ret; | |
1476 | typeof(set_sig_addr_hook) set_sig_addr; | |
1477 | ||
1478 | DEBUGP("nf_ct_ras: URQ\n"); | |
1479 | ||
1480 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1481 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
1482 | ret = set_sig_addr(pskb, ct, ctinfo, data, | |
1483 | urq->callSignalAddress.item, | |
1484 | urq->callSignalAddress.count); | |
1485 | if (ret < 0) | |
1486 | return -1; | |
1487 | } | |
1488 | ||
1489 | /* Clear old expect */ | |
1490 | nf_ct_remove_expectations(ct); | |
1491 | info->sig_port[dir] = 0; | |
1492 | info->sig_port[!dir] = 0; | |
1493 | ||
1494 | /* Give it 30 seconds for UCF or URJ */ | |
1495 | nf_ct_refresh(ct, *pskb, 30 * HZ); | |
1496 | ||
1497 | return 0; | |
1498 | } | |
1499 | ||
1500 | /****************************************************************************/ | |
1501 | static int process_arq(struct sk_buff **pskb, struct nf_conn *ct, | |
1502 | enum ip_conntrack_info ctinfo, | |
1503 | unsigned char **data, AdmissionRequest *arq) | |
1504 | { | |
1505 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1506 | int dir = CTINFO2DIR(ctinfo); | |
1507 | __be16 port; | |
1508 | union nf_conntrack_address addr; | |
1509 | typeof(set_h225_addr_hook) set_h225_addr; | |
1510 | ||
1511 | DEBUGP("nf_ct_ras: ARQ\n"); | |
1512 | ||
1513 | set_h225_addr = rcu_dereference(set_h225_addr_hook); | |
1514 | if ((arq->options & eAdmissionRequest_destCallSignalAddress) && | |
1515 | get_h225_addr(ct, *data, &arq->destCallSignalAddress, | |
1516 | &addr, &port) && | |
1517 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && | |
1518 | port == info->sig_port[dir] && | |
1519 | set_h225_addr && ct->status & IPS_NAT_MASK) { | |
1520 | /* Answering ARQ */ | |
1521 | return set_h225_addr(pskb, data, 0, | |
1522 | &arq->destCallSignalAddress, | |
1523 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1524 | info->sig_port[!dir]); | |
1525 | } | |
1526 | ||
1527 | if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && | |
1528 | get_h225_addr(ct, *data, &arq->srcCallSignalAddress, | |
1529 | &addr, &port) && | |
1530 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && | |
1531 | set_h225_addr && ct->status & IPS_NAT_MASK) { | |
1532 | /* Calling ARQ */ | |
1533 | return set_h225_addr(pskb, data, 0, | |
1534 | &arq->srcCallSignalAddress, | |
1535 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1536 | port); | |
1537 | } | |
1538 | ||
1539 | return 0; | |
1540 | } | |
1541 | ||
1542 | /****************************************************************************/ | |
1543 | static int process_acf(struct sk_buff **pskb, struct nf_conn *ct, | |
1544 | enum ip_conntrack_info ctinfo, | |
1545 | unsigned char **data, AdmissionConfirm *acf) | |
1546 | { | |
1547 | int dir = CTINFO2DIR(ctinfo); | |
1548 | int ret = 0; | |
1549 | __be16 port; | |
1550 | union nf_conntrack_address addr; | |
1551 | struct nf_conntrack_expect *exp; | |
1552 | typeof(set_sig_addr_hook) set_sig_addr; | |
1553 | ||
1554 | DEBUGP("nf_ct_ras: ACF\n"); | |
1555 | ||
1556 | if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, | |
1557 | &addr, &port)) | |
1558 | return 0; | |
1559 | ||
1560 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { | |
1561 | /* Answering ACF */ | |
1562 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1563 | if (set_sig_addr && ct->status & IPS_NAT_MASK) | |
1564 | return set_sig_addr(pskb, ct, ctinfo, data, | |
1565 | &acf->destCallSignalAddress, 1); | |
1566 | return 0; | |
1567 | } | |
1568 | ||
1569 | /* Need new expect */ | |
1570 | if ((exp = nf_conntrack_expect_alloc(ct)) == NULL) | |
1571 | return -1; | |
1572 | nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, | |
1573 | &ct->tuplehash[!dir].tuple.src.u3, &addr, | |
1574 | IPPROTO_TCP, NULL, &port); | |
1575 | exp->flags = NF_CT_EXPECT_PERMANENT; | |
1576 | exp->helper = nf_conntrack_helper_q931; | |
1577 | ||
1578 | if (nf_conntrack_expect_related(exp) == 0) { | |
1579 | DEBUGP("nf_ct_ras: expect Q.931 "); | |
1580 | NF_CT_DUMP_TUPLE(&exp->tuple); | |
1581 | } else | |
1582 | ret = -1; | |
1583 | ||
1584 | nf_conntrack_expect_put(exp); | |
1585 | ||
1586 | return ret; | |
1587 | } | |
1588 | ||
1589 | /****************************************************************************/ | |
1590 | static int process_lrq(struct sk_buff **pskb, struct nf_conn *ct, | |
1591 | enum ip_conntrack_info ctinfo, | |
1592 | unsigned char **data, LocationRequest *lrq) | |
1593 | { | |
1594 | typeof(set_ras_addr_hook) set_ras_addr; | |
1595 | ||
1596 | DEBUGP("nf_ct_ras: LRQ\n"); | |
1597 | ||
1598 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1599 | if (set_ras_addr && ct->status & IPS_NAT_MASK) | |
1600 | return set_ras_addr(pskb, ct, ctinfo, data, | |
1601 | &lrq->replyAddress, 1); | |
1602 | return 0; | |
1603 | } | |
1604 | ||
1605 | /****************************************************************************/ | |
1606 | static int process_lcf(struct sk_buff **pskb, struct nf_conn *ct, | |
1607 | enum ip_conntrack_info ctinfo, | |
1608 | unsigned char **data, LocationConfirm *lcf) | |
1609 | { | |
1610 | int dir = CTINFO2DIR(ctinfo); | |
1611 | int ret = 0; | |
1612 | __be16 port; | |
1613 | union nf_conntrack_address addr; | |
1614 | struct nf_conntrack_expect *exp; | |
1615 | ||
1616 | DEBUGP("nf_ct_ras: LCF\n"); | |
1617 | ||
1618 | if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, | |
1619 | &addr, &port)) | |
1620 | return 0; | |
1621 | ||
1622 | /* Need new expect for call signal */ | |
1623 | if ((exp = nf_conntrack_expect_alloc(ct)) == NULL) | |
1624 | return -1; | |
1625 | nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, | |
1626 | &ct->tuplehash[!dir].tuple.src.u3, &addr, | |
1627 | IPPROTO_TCP, NULL, &port); | |
1628 | exp->flags = NF_CT_EXPECT_PERMANENT; | |
1629 | exp->helper = nf_conntrack_helper_q931; | |
1630 | ||
1631 | if (nf_conntrack_expect_related(exp) == 0) { | |
1632 | DEBUGP("nf_ct_ras: expect Q.931 "); | |
1633 | NF_CT_DUMP_TUPLE(&exp->tuple); | |
1634 | } else | |
1635 | ret = -1; | |
1636 | ||
1637 | nf_conntrack_expect_put(exp); | |
1638 | ||
1639 | /* Ignore rasAddress */ | |
1640 | ||
1641 | return ret; | |
1642 | } | |
1643 | ||
1644 | /****************************************************************************/ | |
1645 | static int process_irr(struct sk_buff **pskb, struct nf_conn *ct, | |
1646 | enum ip_conntrack_info ctinfo, | |
1647 | unsigned char **data, InfoRequestResponse *irr) | |
1648 | { | |
1649 | int ret; | |
1650 | typeof(set_ras_addr_hook) set_ras_addr; | |
1651 | typeof(set_sig_addr_hook) set_sig_addr; | |
1652 | ||
1653 | DEBUGP("nf_ct_ras: IRR\n"); | |
1654 | ||
1655 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1656 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { | |
1657 | ret = set_ras_addr(pskb, ct, ctinfo, data, | |
1658 | &irr->rasAddress, 1); | |
1659 | if (ret < 0) | |
1660 | return -1; | |
1661 | } | |
1662 | ||
1663 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1664 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
1665 | ret = set_sig_addr(pskb, ct, ctinfo, data, | |
1666 | irr->callSignalAddress.item, | |
1667 | irr->callSignalAddress.count); | |
1668 | if (ret < 0) | |
1669 | return -1; | |
1670 | } | |
1671 | ||
1672 | return 0; | |
1673 | } | |
1674 | ||
1675 | /****************************************************************************/ | |
1676 | static int process_ras(struct sk_buff **pskb, struct nf_conn *ct, | |
1677 | enum ip_conntrack_info ctinfo, | |
1678 | unsigned char **data, RasMessage *ras) | |
1679 | { | |
1680 | switch (ras->choice) { | |
1681 | case eRasMessage_gatekeeperRequest: | |
1682 | return process_grq(pskb, ct, ctinfo, data, | |
1683 | &ras->gatekeeperRequest); | |
1684 | case eRasMessage_gatekeeperConfirm: | |
1685 | return process_gcf(pskb, ct, ctinfo, data, | |
1686 | &ras->gatekeeperConfirm); | |
1687 | case eRasMessage_registrationRequest: | |
1688 | return process_rrq(pskb, ct, ctinfo, data, | |
1689 | &ras->registrationRequest); | |
1690 | case eRasMessage_registrationConfirm: | |
1691 | return process_rcf(pskb, ct, ctinfo, data, | |
1692 | &ras->registrationConfirm); | |
1693 | case eRasMessage_unregistrationRequest: | |
1694 | return process_urq(pskb, ct, ctinfo, data, | |
1695 | &ras->unregistrationRequest); | |
1696 | case eRasMessage_admissionRequest: | |
1697 | return process_arq(pskb, ct, ctinfo, data, | |
1698 | &ras->admissionRequest); | |
1699 | case eRasMessage_admissionConfirm: | |
1700 | return process_acf(pskb, ct, ctinfo, data, | |
1701 | &ras->admissionConfirm); | |
1702 | case eRasMessage_locationRequest: | |
1703 | return process_lrq(pskb, ct, ctinfo, data, | |
1704 | &ras->locationRequest); | |
1705 | case eRasMessage_locationConfirm: | |
1706 | return process_lcf(pskb, ct, ctinfo, data, | |
1707 | &ras->locationConfirm); | |
1708 | case eRasMessage_infoRequestResponse: | |
1709 | return process_irr(pskb, ct, ctinfo, data, | |
1710 | &ras->infoRequestResponse); | |
1711 | default: | |
1712 | DEBUGP("nf_ct_ras: RAS message %d\n", ras->choice); | |
1713 | break; | |
1714 | } | |
1715 | ||
1716 | return 0; | |
1717 | } | |
1718 | ||
1719 | /****************************************************************************/ | |
1720 | static int ras_help(struct sk_buff **pskb, unsigned int protoff, | |
1721 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) | |
1722 | { | |
1723 | static RasMessage ras; | |
1724 | unsigned char *data; | |
1725 | int datalen = 0; | |
1726 | int ret; | |
1727 | ||
1728 | DEBUGP("nf_ct_ras: skblen = %u\n", (*pskb)->len); | |
1729 | ||
1730 | spin_lock_bh(&nf_h323_lock); | |
1731 | ||
1732 | /* Get UDP data */ | |
1733 | data = get_udp_data(pskb, protoff, &datalen); | |
1734 | if (data == NULL) | |
1735 | goto accept; | |
1736 | DEBUGP("nf_ct_ras: RAS message len=%d ", datalen); | |
1737 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); | |
1738 | ||
1739 | /* Decode RAS message */ | |
1740 | ret = DecodeRasMessage(data, datalen, &ras); | |
1741 | if (ret < 0) { | |
1742 | if (net_ratelimit()) | |
1743 | printk("nf_ct_ras: decoding error: %s\n", | |
1744 | ret == H323_ERROR_BOUND ? | |
1745 | "out of bound" : "out of range"); | |
1746 | goto accept; | |
1747 | } | |
1748 | ||
1749 | /* Process RAS message */ | |
1750 | if (process_ras(pskb, ct, ctinfo, &data, &ras) < 0) | |
1751 | goto drop; | |
1752 | ||
1753 | accept: | |
1754 | spin_unlock_bh(&nf_h323_lock); | |
1755 | return NF_ACCEPT; | |
1756 | ||
1757 | drop: | |
1758 | spin_unlock_bh(&nf_h323_lock); | |
1759 | if (net_ratelimit()) | |
1760 | printk("nf_ct_ras: packet dropped\n"); | |
1761 | return NF_DROP; | |
1762 | } | |
1763 | ||
1764 | /****************************************************************************/ | |
1765 | static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { | |
1766 | { | |
1767 | .name = "RAS", | |
1768 | .me = THIS_MODULE, | |
1769 | .max_expected = 32, | |
1770 | .timeout = 240, | |
1771 | .tuple.src.l3num = AF_INET, | |
1772 | .tuple.src.u.udp.port = __constant_htons(RAS_PORT), | |
1773 | .tuple.dst.protonum = IPPROTO_UDP, | |
1774 | .mask.src.l3num = 0xFFFF, | |
1775 | .mask.src.u.udp.port = __constant_htons(0xFFFF), | |
1776 | .mask.dst.protonum = 0xFF, | |
1777 | .help = ras_help, | |
1778 | }, | |
1779 | { | |
1780 | .name = "RAS", | |
1781 | .me = THIS_MODULE, | |
1782 | .max_expected = 32, | |
1783 | .timeout = 240, | |
1784 | .tuple.src.l3num = AF_INET6, | |
1785 | .tuple.src.u.udp.port = __constant_htons(RAS_PORT), | |
1786 | .tuple.dst.protonum = IPPROTO_UDP, | |
1787 | .mask.src.l3num = 0xFFFF, | |
1788 | .mask.src.u.udp.port = __constant_htons(0xFFFF), | |
1789 | .mask.dst.protonum = 0xFF, | |
1790 | .help = ras_help, | |
1791 | }, | |
1792 | }; | |
1793 | ||
1794 | /****************************************************************************/ | |
1795 | static void __exit nf_conntrack_h323_fini(void) | |
1796 | { | |
1797 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]); | |
1798 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); | |
1799 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); | |
1800 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); | |
1801 | kfree(h323_buffer); | |
1802 | DEBUGP("nf_ct_h323: fini\n"); | |
1803 | } | |
1804 | ||
1805 | /****************************************************************************/ | |
1806 | static int __init nf_conntrack_h323_init(void) | |
1807 | { | |
1808 | int ret; | |
1809 | ||
1810 | h323_buffer = kmalloc(65536, GFP_KERNEL); | |
1811 | if (!h323_buffer) | |
1812 | return -ENOMEM; | |
1813 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]); | |
1814 | if (ret < 0) | |
1815 | goto err1; | |
1816 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]); | |
1817 | if (ret < 0) | |
1818 | goto err2; | |
1819 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]); | |
1820 | if (ret < 0) | |
1821 | goto err3; | |
1822 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]); | |
1823 | if (ret < 0) | |
1824 | goto err4; | |
1825 | DEBUGP("nf_ct_h323: init success\n"); | |
1826 | return 0; | |
1827 | ||
1828 | err4: | |
1829 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); | |
1830 | err3: | |
1831 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); | |
1832 | err2: | |
1833 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); | |
1834 | err1: | |
1835 | return ret; | |
1836 | } | |
1837 | ||
1838 | /****************************************************************************/ | |
1839 | module_init(nf_conntrack_h323_init); | |
1840 | module_exit(nf_conntrack_h323_fini); | |
1841 | ||
1842 | EXPORT_SYMBOL_GPL(get_h225_addr); | |
1843 | EXPORT_SYMBOL_GPL(set_h245_addr_hook); | |
1844 | EXPORT_SYMBOL_GPL(set_h225_addr_hook); | |
1845 | EXPORT_SYMBOL_GPL(set_sig_addr_hook); | |
1846 | EXPORT_SYMBOL_GPL(set_ras_addr_hook); | |
1847 | EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); | |
1848 | EXPORT_SYMBOL_GPL(nat_t120_hook); | |
1849 | EXPORT_SYMBOL_GPL(nat_h245_hook); | |
1850 | EXPORT_SYMBOL_GPL(nat_callforwarding_hook); | |
1851 | EXPORT_SYMBOL_GPL(nat_q931_hook); | |
1852 | ||
1853 | MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); | |
1854 | MODULE_DESCRIPTION("H.323 connection tracking helper"); | |
1855 | MODULE_LICENSE("GPL"); | |
1856 | MODULE_ALIAS("ip_conntrack_h323"); |