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f587de0e PM |
1 | /* |
2 | * H.323 connection tracking helper | |
3 | * | |
4 | * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net> | |
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 " | |
601e68e1 | 52 | "if both endpoints are on different sides " |
f587de0e PM |
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 */ | |
91e8db80 | 166 | DEBUGP("nf_ct_h323: fragmented TPKT\n"); |
f587de0e PM |
167 | goto clear_out; |
168 | } | |
169 | ||
170 | /* It is not even a TPKT */ | |
171 | return 0; | |
172 | } | |
173 | tpktoff = 0; | |
174 | } else { /* Next TPKT */ | |
175 | tpktoff = *dataoff + *datalen; | |
176 | tcpdatalen -= tpktoff; | |
177 | if (tcpdatalen <= 4) /* No more TPKT */ | |
178 | goto clear_out; | |
179 | tpkt = *data + *datalen; | |
180 | ||
181 | /* Validate TPKT identifier */ | |
182 | if (tpkt[0] != 0x03 || tpkt[1] != 0) | |
183 | goto clear_out; | |
184 | } | |
185 | ||
186 | /* Validate TPKT length */ | |
187 | tpktlen = tpkt[2] * 256 + tpkt[3]; | |
188 | if (tpktlen < 4) | |
189 | goto clear_out; | |
190 | if (tpktlen > tcpdatalen) { | |
191 | if (tcpdatalen == 4) { /* Separate TPKT header */ | |
192 | /* Netmeeting sends TPKT header and data separately */ | |
193 | DEBUGP("nf_ct_h323: separate TPKT header indicates " | |
194 | "there will be TPKT data of %hu bytes\n", | |
195 | tpktlen - 4); | |
196 | info->tpkt_len[dir] = tpktlen - 4; | |
197 | return 0; | |
198 | } | |
199 | ||
200 | if (net_ratelimit()) | |
201 | printk("nf_ct_h323: incomplete TPKT (fragmented?)\n"); | |
202 | goto clear_out; | |
203 | } | |
204 | ||
205 | /* This is the encapsulated data */ | |
206 | *data = tpkt + 4; | |
207 | *datalen = tpktlen - 4; | |
208 | *dataoff = tpktoff + 4; | |
209 | ||
210 | out: | |
211 | /* Clear TPKT length */ | |
212 | info->tpkt_len[dir] = 0; | |
213 | return 1; | |
214 | ||
215 | clear_out: | |
216 | info->tpkt_len[dir] = 0; | |
217 | return 0; | |
218 | } | |
219 | ||
220 | /****************************************************************************/ | |
221 | static int get_h245_addr(struct nf_conn *ct, unsigned char *data, | |
222 | H245_TransportAddress *taddr, | |
223 | union nf_conntrack_address *addr, __be16 *port) | |
224 | { | |
225 | unsigned char *p; | |
226 | int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
227 | int len; | |
228 | ||
229 | if (taddr->choice != eH245_TransportAddress_unicastAddress) | |
230 | return 0; | |
231 | ||
232 | switch (taddr->unicastAddress.choice) { | |
233 | case eUnicastAddress_iPAddress: | |
234 | if (family != AF_INET) | |
235 | return 0; | |
236 | p = data + taddr->unicastAddress.iPAddress.network; | |
237 | len = 4; | |
238 | break; | |
239 | case eUnicastAddress_iP6Address: | |
240 | if (family != AF_INET6) | |
241 | return 0; | |
242 | p = data + taddr->unicastAddress.iP6Address.network; | |
243 | len = 16; | |
244 | break; | |
245 | default: | |
246 | return 0; | |
247 | } | |
248 | ||
249 | memcpy(addr, p, len); | |
250 | memset((void *)addr + len, 0, sizeof(*addr) - len); | |
251 | memcpy(port, p + len, sizeof(__be16)); | |
252 | ||
253 | return 1; | |
254 | } | |
255 | ||
256 | /****************************************************************************/ | |
257 | static int expect_rtp_rtcp(struct sk_buff **pskb, struct nf_conn *ct, | |
258 | enum ip_conntrack_info ctinfo, | |
259 | unsigned char **data, int dataoff, | |
260 | H245_TransportAddress *taddr) | |
261 | { | |
262 | int dir = CTINFO2DIR(ctinfo); | |
263 | int ret = 0; | |
264 | __be16 port; | |
265 | __be16 rtp_port, rtcp_port; | |
266 | union nf_conntrack_address addr; | |
267 | struct nf_conntrack_expect *rtp_exp; | |
268 | struct nf_conntrack_expect *rtcp_exp; | |
269 | typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp; | |
270 | ||
271 | /* Read RTP or RTCP address */ | |
272 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || | |
273 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
274 | port == 0) | |
275 | return 0; | |
276 | ||
277 | /* RTP port is even */ | |
278 | port &= htons(~1); | |
279 | rtp_port = port; | |
280 | rtcp_port = htons(ntohs(port) + 1); | |
281 | ||
282 | /* Create expect for RTP */ | |
6823645d | 283 | if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 284 | return -1; |
6823645d PM |
285 | nf_ct_expect_init(rtp_exp, ct->tuplehash[!dir].tuple.src.l3num, |
286 | &ct->tuplehash[!dir].tuple.src.u3, | |
287 | &ct->tuplehash[!dir].tuple.dst.u3, | |
288 | IPPROTO_UDP, NULL, &rtp_port); | |
f587de0e PM |
289 | |
290 | /* Create expect for RTCP */ | |
6823645d PM |
291 | if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) { |
292 | nf_ct_expect_put(rtp_exp); | |
f587de0e PM |
293 | return -1; |
294 | } | |
6823645d PM |
295 | nf_ct_expect_init(rtcp_exp, ct->tuplehash[!dir].tuple.src.l3num, |
296 | &ct->tuplehash[!dir].tuple.src.u3, | |
297 | &ct->tuplehash[!dir].tuple.dst.u3, | |
298 | IPPROTO_UDP, NULL, &rtcp_port); | |
f587de0e PM |
299 | |
300 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
601e68e1 | 301 | &ct->tuplehash[!dir].tuple.dst.u3, |
f587de0e PM |
302 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
303 | (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) && | |
304 | ct->status & IPS_NAT_MASK) { | |
305 | /* NAT needed */ | |
306 | ret = nat_rtp_rtcp(pskb, ct, ctinfo, data, dataoff, | |
307 | taddr, port, rtp_port, rtp_exp, rtcp_exp); | |
308 | } else { /* Conntrack only */ | |
6823645d PM |
309 | if (nf_ct_expect_related(rtp_exp) == 0) { |
310 | if (nf_ct_expect_related(rtcp_exp) == 0) { | |
f587de0e PM |
311 | DEBUGP("nf_ct_h323: expect RTP "); |
312 | NF_CT_DUMP_TUPLE(&rtp_exp->tuple); | |
313 | DEBUGP("nf_ct_h323: expect RTCP "); | |
314 | NF_CT_DUMP_TUPLE(&rtcp_exp->tuple); | |
315 | } else { | |
6823645d | 316 | nf_ct_unexpect_related(rtp_exp); |
f587de0e PM |
317 | ret = -1; |
318 | } | |
319 | } else | |
320 | ret = -1; | |
321 | } | |
322 | ||
6823645d PM |
323 | nf_ct_expect_put(rtp_exp); |
324 | nf_ct_expect_put(rtcp_exp); | |
f587de0e PM |
325 | |
326 | return ret; | |
327 | } | |
328 | ||
329 | /****************************************************************************/ | |
330 | static int expect_t120(struct sk_buff **pskb, | |
331 | struct nf_conn *ct, | |
332 | enum ip_conntrack_info ctinfo, | |
333 | unsigned char **data, int dataoff, | |
334 | H245_TransportAddress *taddr) | |
335 | { | |
336 | int dir = CTINFO2DIR(ctinfo); | |
337 | int ret = 0; | |
338 | __be16 port; | |
339 | union nf_conntrack_address addr; | |
340 | struct nf_conntrack_expect *exp; | |
341 | typeof(nat_t120_hook) nat_t120; | |
342 | ||
343 | /* Read T.120 address */ | |
344 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || | |
345 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
346 | port == 0) | |
347 | return 0; | |
348 | ||
349 | /* Create expect for T.120 connections */ | |
6823645d | 350 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 351 | return -1; |
6823645d PM |
352 | nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
353 | &ct->tuplehash[!dir].tuple.src.u3, | |
354 | &ct->tuplehash[!dir].tuple.dst.u3, | |
355 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
356 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */ |
357 | ||
358 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
359 | &ct->tuplehash[!dir].tuple.dst.u3, | |
360 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
361 | (nat_t120 = rcu_dereference(nat_t120_hook)) && | |
362 | ct->status & IPS_NAT_MASK) { | |
363 | /* NAT needed */ | |
364 | ret = nat_t120(pskb, ct, ctinfo, data, dataoff, taddr, | |
365 | port, exp); | |
366 | } else { /* Conntrack only */ | |
6823645d | 367 | if (nf_ct_expect_related(exp) == 0) { |
f587de0e PM |
368 | DEBUGP("nf_ct_h323: expect T.120 "); |
369 | NF_CT_DUMP_TUPLE(&exp->tuple); | |
370 | } else | |
371 | ret = -1; | |
372 | } | |
373 | ||
6823645d | 374 | nf_ct_expect_put(exp); |
f587de0e PM |
375 | |
376 | return ret; | |
377 | } | |
378 | ||
379 | /****************************************************************************/ | |
380 | static int process_h245_channel(struct sk_buff **pskb, | |
381 | struct nf_conn *ct, | |
382 | enum ip_conntrack_info ctinfo, | |
383 | unsigned char **data, int dataoff, | |
384 | H2250LogicalChannelParameters *channel) | |
385 | { | |
386 | int ret; | |
387 | ||
388 | if (channel->options & eH2250LogicalChannelParameters_mediaChannel) { | |
389 | /* RTP */ | |
390 | ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff, | |
391 | &channel->mediaChannel); | |
392 | if (ret < 0) | |
393 | return -1; | |
394 | } | |
395 | ||
396 | if (channel-> | |
397 | options & eH2250LogicalChannelParameters_mediaControlChannel) { | |
398 | /* RTCP */ | |
399 | ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff, | |
400 | &channel->mediaControlChannel); | |
401 | if (ret < 0) | |
402 | return -1; | |
403 | } | |
404 | ||
405 | return 0; | |
406 | } | |
407 | ||
408 | /****************************************************************************/ | |
409 | static int process_olc(struct sk_buff **pskb, struct nf_conn *ct, | |
410 | enum ip_conntrack_info ctinfo, | |
411 | unsigned char **data, int dataoff, | |
412 | OpenLogicalChannel *olc) | |
413 | { | |
414 | int ret; | |
415 | ||
416 | DEBUGP("nf_ct_h323: OpenLogicalChannel\n"); | |
417 | ||
418 | if (olc->forwardLogicalChannelParameters.multiplexParameters.choice == | |
419 | eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters) | |
420 | { | |
421 | ret = process_h245_channel(pskb, ct, ctinfo, data, dataoff, | |
422 | &olc-> | |
423 | forwardLogicalChannelParameters. | |
424 | multiplexParameters. | |
425 | h2250LogicalChannelParameters); | |
426 | if (ret < 0) | |
427 | return -1; | |
428 | } | |
429 | ||
430 | if ((olc->options & | |
431 | eOpenLogicalChannel_reverseLogicalChannelParameters) && | |
432 | (olc->reverseLogicalChannelParameters.options & | |
433 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters) | |
434 | && (olc->reverseLogicalChannelParameters.multiplexParameters. | |
435 | choice == | |
436 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) | |
437 | { | |
438 | ret = | |
439 | process_h245_channel(pskb, ct, ctinfo, data, dataoff, | |
440 | &olc-> | |
441 | reverseLogicalChannelParameters. | |
442 | multiplexParameters. | |
443 | h2250LogicalChannelParameters); | |
444 | if (ret < 0) | |
445 | return -1; | |
446 | } | |
447 | ||
448 | if ((olc->options & eOpenLogicalChannel_separateStack) && | |
449 | olc->forwardLogicalChannelParameters.dataType.choice == | |
450 | eDataType_data && | |
451 | olc->forwardLogicalChannelParameters.dataType.data.application. | |
452 | choice == eDataApplicationCapability_application_t120 && | |
453 | olc->forwardLogicalChannelParameters.dataType.data.application. | |
454 | t120.choice == eDataProtocolCapability_separateLANStack && | |
455 | olc->separateStack.networkAddress.choice == | |
456 | eNetworkAccessParameters_networkAddress_localAreaAddress) { | |
457 | ret = expect_t120(pskb, ct, ctinfo, data, dataoff, | |
458 | &olc->separateStack.networkAddress. | |
459 | localAreaAddress); | |
460 | if (ret < 0) | |
461 | return -1; | |
462 | } | |
463 | ||
464 | return 0; | |
465 | } | |
466 | ||
467 | /****************************************************************************/ | |
468 | static int process_olca(struct sk_buff **pskb, struct nf_conn *ct, | |
469 | enum ip_conntrack_info ctinfo, | |
470 | unsigned char **data, int dataoff, | |
471 | OpenLogicalChannelAck *olca) | |
472 | { | |
473 | H2250LogicalChannelAckParameters *ack; | |
474 | int ret; | |
475 | ||
476 | DEBUGP("nf_ct_h323: OpenLogicalChannelAck\n"); | |
477 | ||
478 | if ((olca->options & | |
479 | eOpenLogicalChannelAck_reverseLogicalChannelParameters) && | |
480 | (olca->reverseLogicalChannelParameters.options & | |
481 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters) | |
482 | && (olca->reverseLogicalChannelParameters.multiplexParameters. | |
483 | choice == | |
484 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) | |
485 | { | |
486 | ret = process_h245_channel(pskb, ct, ctinfo, data, dataoff, | |
487 | &olca-> | |
488 | reverseLogicalChannelParameters. | |
489 | multiplexParameters. | |
490 | h2250LogicalChannelParameters); | |
491 | if (ret < 0) | |
492 | return -1; | |
493 | } | |
494 | ||
495 | if ((olca->options & | |
496 | eOpenLogicalChannelAck_forwardMultiplexAckParameters) && | |
497 | (olca->forwardMultiplexAckParameters.choice == | |
498 | eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters)) | |
499 | { | |
500 | ack = &olca->forwardMultiplexAckParameters. | |
501 | h2250LogicalChannelAckParameters; | |
502 | if (ack->options & | |
503 | eH2250LogicalChannelAckParameters_mediaChannel) { | |
504 | /* RTP */ | |
505 | ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff, | |
506 | &ack->mediaChannel); | |
507 | if (ret < 0) | |
508 | return -1; | |
509 | } | |
510 | ||
511 | if (ack->options & | |
512 | eH2250LogicalChannelAckParameters_mediaControlChannel) { | |
513 | /* RTCP */ | |
514 | ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff, | |
515 | &ack->mediaControlChannel); | |
516 | if (ret < 0) | |
517 | return -1; | |
518 | } | |
519 | } | |
520 | ||
f8f1c08e JMZ |
521 | if ((olca->options & eOpenLogicalChannelAck_separateStack) && |
522 | olca->separateStack.networkAddress.choice == | |
523 | eNetworkAccessParameters_networkAddress_localAreaAddress) { | |
524 | ret = expect_t120(pskb, ct, ctinfo, data, dataoff, | |
525 | &olca->separateStack.networkAddress. | |
526 | localAreaAddress); | |
527 | if (ret < 0) | |
528 | return -1; | |
529 | } | |
530 | ||
f587de0e PM |
531 | return 0; |
532 | } | |
533 | ||
534 | /****************************************************************************/ | |
535 | static int process_h245(struct sk_buff **pskb, struct nf_conn *ct, | |
536 | enum ip_conntrack_info ctinfo, | |
537 | unsigned char **data, int dataoff, | |
538 | MultimediaSystemControlMessage *mscm) | |
539 | { | |
540 | switch (mscm->choice) { | |
541 | case eMultimediaSystemControlMessage_request: | |
542 | if (mscm->request.choice == | |
543 | eRequestMessage_openLogicalChannel) { | |
544 | return process_olc(pskb, ct, ctinfo, data, dataoff, | |
545 | &mscm->request.openLogicalChannel); | |
546 | } | |
547 | DEBUGP("nf_ct_h323: H.245 Request %d\n", | |
548 | mscm->request.choice); | |
549 | break; | |
550 | case eMultimediaSystemControlMessage_response: | |
551 | if (mscm->response.choice == | |
552 | eResponseMessage_openLogicalChannelAck) { | |
553 | return process_olca(pskb, ct, ctinfo, data, dataoff, | |
554 | &mscm->response. | |
555 | openLogicalChannelAck); | |
556 | } | |
557 | DEBUGP("nf_ct_h323: H.245 Response %d\n", | |
558 | mscm->response.choice); | |
559 | break; | |
560 | default: | |
561 | DEBUGP("nf_ct_h323: H.245 signal %d\n", mscm->choice); | |
562 | break; | |
563 | } | |
564 | ||
565 | return 0; | |
566 | } | |
567 | ||
568 | /****************************************************************************/ | |
569 | static int h245_help(struct sk_buff **pskb, unsigned int protoff, | |
570 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) | |
571 | { | |
572 | static MultimediaSystemControlMessage mscm; | |
573 | unsigned char *data = NULL; | |
574 | int datalen; | |
575 | int dataoff; | |
576 | int ret; | |
577 | ||
578 | /* Until there's been traffic both ways, don't look in packets. */ | |
579 | if (ctinfo != IP_CT_ESTABLISHED && | |
580 | ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) { | |
581 | return NF_ACCEPT; | |
582 | } | |
583 | DEBUGP("nf_ct_h245: skblen = %u\n", (*pskb)->len); | |
584 | ||
585 | spin_lock_bh(&nf_h323_lock); | |
586 | ||
587 | /* Process each TPKT */ | |
588 | while (get_tpkt_data(pskb, protoff, ct, ctinfo, | |
589 | &data, &datalen, &dataoff)) { | |
590 | DEBUGP("nf_ct_h245: TPKT len=%d ", datalen); | |
591 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); | |
592 | ||
593 | /* Decode H.245 signal */ | |
594 | ret = DecodeMultimediaSystemControlMessage(data, datalen, | |
595 | &mscm); | |
596 | if (ret < 0) { | |
91e8db80 PM |
597 | DEBUGP("nf_ct_h245: decoding error: %s\n", |
598 | ret == H323_ERROR_BOUND ? | |
599 | "out of bound" : "out of range"); | |
f587de0e PM |
600 | /* We don't drop when decoding error */ |
601 | break; | |
602 | } | |
603 | ||
604 | /* Process H.245 signal */ | |
605 | if (process_h245(pskb, ct, ctinfo, &data, dataoff, &mscm) < 0) | |
606 | goto drop; | |
607 | } | |
608 | ||
609 | spin_unlock_bh(&nf_h323_lock); | |
610 | return NF_ACCEPT; | |
611 | ||
612 | drop: | |
613 | spin_unlock_bh(&nf_h323_lock); | |
614 | if (net_ratelimit()) | |
615 | printk("nf_ct_h245: packet dropped\n"); | |
616 | return NF_DROP; | |
617 | } | |
618 | ||
619 | /****************************************************************************/ | |
620 | static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { | |
621 | .name = "H.245", | |
622 | .me = THIS_MODULE, | |
623 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */, | |
624 | .timeout = 240, | |
625 | .tuple.dst.protonum = IPPROTO_UDP, | |
f587de0e PM |
626 | .help = h245_help |
627 | }; | |
628 | ||
629 | /****************************************************************************/ | |
630 | int get_h225_addr(struct nf_conn *ct, unsigned char *data, | |
631 | TransportAddress *taddr, | |
632 | union nf_conntrack_address *addr, __be16 *port) | |
633 | { | |
634 | unsigned char *p; | |
635 | int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
636 | int len; | |
637 | ||
638 | switch (taddr->choice) { | |
639 | case eTransportAddress_ipAddress: | |
640 | if (family != AF_INET) | |
641 | return 0; | |
642 | p = data + taddr->ipAddress.ip; | |
643 | len = 4; | |
644 | break; | |
645 | case eTransportAddress_ip6Address: | |
646 | if (family != AF_INET6) | |
647 | return 0; | |
bb807245 | 648 | p = data + taddr->ip6Address.ip; |
f587de0e PM |
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 **pskb, 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_conntrack_address 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 */ | |
6823645d | 682 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 683 | return -1; |
6823645d PM |
684 | nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
685 | &ct->tuplehash[!dir].tuple.src.u3, | |
686 | &ct->tuplehash[!dir].tuple.dst.u3, | |
687 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
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(pskb, ct, ctinfo, data, dataoff, taddr, | |
697 | port, exp); | |
698 | } else { /* Conntrack only */ | |
6823645d | 699 | if (nf_ct_expect_related(exp) == 0) { |
f587de0e PM |
700 | DEBUGP("nf_ct_q931: expect H.245 "); |
701 | NF_CT_DUMP_TUPLE(&exp->tuple); | |
702 | } else | |
703 | ret = -1; | |
704 | } | |
705 | ||
6823645d | 706 | nf_ct_expect_put(exp); |
f587de0e PM |
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(union nf_conntrack_address *src, | |
714 | union nf_conntrack_address *dst, | |
715 | int family) | |
716 | { | |
717 | struct flowi fl1, fl2; | |
718 | int ret = 0; | |
719 | ||
720 | memset(&fl1, 0, sizeof(fl1)); | |
721 | memset(&fl2, 0, sizeof(fl2)); | |
722 | ||
723 | switch (family) { | |
724 | case AF_INET: { | |
725 | struct rtable *rt1, *rt2; | |
726 | ||
727 | fl1.fl4_dst = src->ip; | |
728 | fl2.fl4_dst = dst->ip; | |
729 | if (ip_route_output_key(&rt1, &fl1) == 0) { | |
730 | if (ip_route_output_key(&rt2, &fl2) == 0) { | |
731 | if (rt1->rt_gateway == rt2->rt_gateway && | |
732 | rt1->u.dst.dev == rt2->u.dst.dev) | |
733 | ret = 1; | |
734 | dst_release(&rt2->u.dst); | |
735 | } | |
736 | dst_release(&rt1->u.dst); | |
737 | } | |
738 | break; | |
739 | } | |
740 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
741 | case AF_INET6: { | |
742 | struct rt6_info *rt1, *rt2; | |
743 | ||
744 | memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst)); | |
745 | memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst)); | |
746 | rt1 = (struct rt6_info *)ip6_route_output(NULL, &fl1); | |
747 | if (rt1) { | |
748 | rt2 = (struct rt6_info *)ip6_route_output(NULL, &fl2); | |
749 | if (rt2) { | |
750 | if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway, | |
601e68e1 | 751 | sizeof(rt1->rt6i_gateway)) && |
f587de0e PM |
752 | rt1->u.dst.dev == rt2->u.dst.dev) |
753 | ret = 1; | |
754 | dst_release(&rt2->u.dst); | |
755 | } | |
756 | dst_release(&rt1->u.dst); | |
757 | } | |
758 | break; | |
759 | } | |
760 | #endif | |
761 | } | |
762 | return ret; | |
763 | ||
764 | } | |
765 | ||
766 | /****************************************************************************/ | |
767 | static int expect_callforwarding(struct sk_buff **pskb, | |
768 | struct nf_conn *ct, | |
769 | enum ip_conntrack_info ctinfo, | |
770 | unsigned char **data, int dataoff, | |
771 | TransportAddress *taddr) | |
772 | { | |
773 | int dir = CTINFO2DIR(ctinfo); | |
774 | int ret = 0; | |
775 | __be16 port; | |
776 | union nf_conntrack_address addr; | |
777 | struct nf_conntrack_expect *exp; | |
778 | typeof(nat_callforwarding_hook) nat_callforwarding; | |
779 | ||
780 | /* Read alternativeAddress */ | |
781 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) | |
782 | return 0; | |
783 | ||
784 | /* If the calling party is on the same side of the forward-to party, | |
785 | * we don't need to track the second call */ | |
786 | if (callforward_filter && | |
787 | callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3, | |
601e68e1 | 788 | ct->tuplehash[!dir].tuple.src.l3num)) { |
f587de0e PM |
789 | DEBUGP("nf_ct_q931: Call Forwarding not tracked\n"); |
790 | return 0; | |
791 | } | |
792 | ||
793 | /* Create expect for the second call leg */ | |
6823645d | 794 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 795 | return -1; |
6823645d PM |
796 | nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
797 | &ct->tuplehash[!dir].tuple.src.u3, &addr, | |
798 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
799 | exp->helper = nf_conntrack_helper_q931; |
800 | ||
801 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
802 | &ct->tuplehash[!dir].tuple.dst.u3, | |
803 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
804 | (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && | |
805 | ct->status & IPS_NAT_MASK) { | |
806 | /* Need NAT */ | |
807 | ret = nat_callforwarding(pskb, ct, ctinfo, data, dataoff, | |
808 | taddr, port, exp); | |
809 | } else { /* Conntrack only */ | |
6823645d | 810 | if (nf_ct_expect_related(exp) == 0) { |
f587de0e PM |
811 | DEBUGP("nf_ct_q931: expect Call Forwarding "); |
812 | NF_CT_DUMP_TUPLE(&exp->tuple); | |
813 | } else | |
814 | ret = -1; | |
815 | } | |
816 | ||
6823645d | 817 | nf_ct_expect_put(exp); |
f587de0e PM |
818 | |
819 | return ret; | |
820 | } | |
821 | ||
822 | /****************************************************************************/ | |
823 | static int process_setup(struct sk_buff **pskb, struct nf_conn *ct, | |
824 | enum ip_conntrack_info ctinfo, | |
825 | unsigned char **data, int dataoff, | |
826 | Setup_UUIE *setup) | |
827 | { | |
828 | int dir = CTINFO2DIR(ctinfo); | |
829 | int ret; | |
830 | int i; | |
831 | __be16 port; | |
832 | union nf_conntrack_address addr; | |
833 | typeof(set_h225_addr_hook) set_h225_addr; | |
834 | ||
835 | DEBUGP("nf_ct_q931: Setup\n"); | |
836 | ||
837 | if (setup->options & eSetup_UUIE_h245Address) { | |
838 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, | |
839 | &setup->h245Address); | |
840 | if (ret < 0) | |
841 | return -1; | |
842 | } | |
843 | ||
844 | set_h225_addr = rcu_dereference(set_h225_addr_hook); | |
845 | if ((setup->options & eSetup_UUIE_destCallSignalAddress) && | |
846 | (set_h225_addr) && ct->status && IPS_NAT_MASK && | |
847 | get_h225_addr(ct, *data, &setup->destCallSignalAddress, | |
601e68e1 | 848 | &addr, &port) && |
f587de0e PM |
849 | memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { |
850 | DEBUGP("nf_ct_q931: set destCallSignalAddress " | |
851 | NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n", | |
852 | NIP6(*(struct in6_addr *)&addr), ntohs(port), | |
853 | NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.src.u3), | |
854 | ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port)); | |
855 | ret = set_h225_addr(pskb, data, dataoff, | |
856 | &setup->destCallSignalAddress, | |
857 | &ct->tuplehash[!dir].tuple.src.u3, | |
858 | ct->tuplehash[!dir].tuple.src.u.tcp.port); | |
859 | if (ret < 0) | |
860 | return -1; | |
861 | } | |
862 | ||
863 | if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && | |
864 | (set_h225_addr) && ct->status & IPS_NAT_MASK && | |
865 | get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, | |
601e68e1 | 866 | &addr, &port) && |
f587de0e PM |
867 | memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { |
868 | DEBUGP("nf_ct_q931: set sourceCallSignalAddress " | |
869 | NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n", | |
870 | NIP6(*(struct in6_addr *)&addr), ntohs(port), | |
871 | NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.dst.u3), | |
872 | ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); | |
873 | ret = set_h225_addr(pskb, data, dataoff, | |
874 | &setup->sourceCallSignalAddress, | |
875 | &ct->tuplehash[!dir].tuple.dst.u3, | |
876 | ct->tuplehash[!dir].tuple.dst.u.tcp.port); | |
877 | if (ret < 0) | |
878 | return -1; | |
879 | } | |
880 | ||
881 | if (setup->options & eSetup_UUIE_fastStart) { | |
882 | for (i = 0; i < setup->fastStart.count; i++) { | |
883 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, | |
884 | &setup->fastStart.item[i]); | |
885 | if (ret < 0) | |
886 | return -1; | |
887 | } | |
888 | } | |
889 | ||
890 | return 0; | |
891 | } | |
892 | ||
893 | /****************************************************************************/ | |
894 | static int process_callproceeding(struct sk_buff **pskb, | |
895 | struct nf_conn *ct, | |
896 | enum ip_conntrack_info ctinfo, | |
897 | unsigned char **data, int dataoff, | |
898 | CallProceeding_UUIE *callproc) | |
899 | { | |
900 | int ret; | |
901 | int i; | |
902 | ||
903 | DEBUGP("nf_ct_q931: CallProceeding\n"); | |
904 | ||
905 | if (callproc->options & eCallProceeding_UUIE_h245Address) { | |
906 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, | |
907 | &callproc->h245Address); | |
908 | if (ret < 0) | |
909 | return -1; | |
910 | } | |
911 | ||
912 | if (callproc->options & eCallProceeding_UUIE_fastStart) { | |
913 | for (i = 0; i < callproc->fastStart.count; i++) { | |
914 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, | |
915 | &callproc->fastStart.item[i]); | |
916 | if (ret < 0) | |
917 | return -1; | |
918 | } | |
919 | } | |
920 | ||
921 | return 0; | |
922 | } | |
923 | ||
924 | /****************************************************************************/ | |
925 | static int process_connect(struct sk_buff **pskb, struct nf_conn *ct, | |
926 | enum ip_conntrack_info ctinfo, | |
927 | unsigned char **data, int dataoff, | |
928 | Connect_UUIE *connect) | |
929 | { | |
930 | int ret; | |
931 | int i; | |
932 | ||
933 | DEBUGP("nf_ct_q931: Connect\n"); | |
934 | ||
935 | if (connect->options & eConnect_UUIE_h245Address) { | |
936 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, | |
937 | &connect->h245Address); | |
938 | if (ret < 0) | |
939 | return -1; | |
940 | } | |
941 | ||
942 | if (connect->options & eConnect_UUIE_fastStart) { | |
943 | for (i = 0; i < connect->fastStart.count; i++) { | |
944 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, | |
945 | &connect->fastStart.item[i]); | |
946 | if (ret < 0) | |
947 | return -1; | |
948 | } | |
949 | } | |
950 | ||
951 | return 0; | |
952 | } | |
953 | ||
954 | /****************************************************************************/ | |
955 | static int process_alerting(struct sk_buff **pskb, struct nf_conn *ct, | |
956 | enum ip_conntrack_info ctinfo, | |
957 | unsigned char **data, int dataoff, | |
958 | Alerting_UUIE *alert) | |
959 | { | |
960 | int ret; | |
961 | int i; | |
962 | ||
963 | DEBUGP("nf_ct_q931: Alerting\n"); | |
964 | ||
965 | if (alert->options & eAlerting_UUIE_h245Address) { | |
966 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, | |
967 | &alert->h245Address); | |
968 | if (ret < 0) | |
969 | return -1; | |
970 | } | |
971 | ||
972 | if (alert->options & eAlerting_UUIE_fastStart) { | |
973 | for (i = 0; i < alert->fastStart.count; i++) { | |
974 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, | |
975 | &alert->fastStart.item[i]); | |
976 | if (ret < 0) | |
977 | return -1; | |
978 | } | |
979 | } | |
980 | ||
981 | return 0; | |
982 | } | |
983 | ||
f587de0e PM |
984 | /****************************************************************************/ |
985 | static int process_facility(struct sk_buff **pskb, struct nf_conn *ct, | |
986 | enum ip_conntrack_info ctinfo, | |
987 | unsigned char **data, int dataoff, | |
988 | Facility_UUIE *facility) | |
989 | { | |
990 | int ret; | |
991 | int i; | |
992 | ||
993 | DEBUGP("nf_ct_q931: Facility\n"); | |
994 | ||
995 | if (facility->reason.choice == eFacilityReason_callForwarded) { | |
996 | if (facility->options & eFacility_UUIE_alternativeAddress) | |
997 | return expect_callforwarding(pskb, ct, ctinfo, data, | |
998 | dataoff, | |
999 | &facility-> | |
1000 | alternativeAddress); | |
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | if (facility->options & eFacility_UUIE_h245Address) { | |
1005 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, | |
1006 | &facility->h245Address); | |
1007 | if (ret < 0) | |
1008 | return -1; | |
1009 | } | |
1010 | ||
1011 | if (facility->options & eFacility_UUIE_fastStart) { | |
1012 | for (i = 0; i < facility->fastStart.count; i++) { | |
1013 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, | |
1014 | &facility->fastStart.item[i]); | |
1015 | if (ret < 0) | |
1016 | return -1; | |
1017 | } | |
1018 | } | |
1019 | ||
1020 | return 0; | |
1021 | } | |
1022 | ||
1023 | /****************************************************************************/ | |
1024 | static int process_progress(struct sk_buff **pskb, struct nf_conn *ct, | |
1025 | enum ip_conntrack_info ctinfo, | |
1026 | unsigned char **data, int dataoff, | |
1027 | Progress_UUIE *progress) | |
1028 | { | |
1029 | int ret; | |
1030 | int i; | |
1031 | ||
1032 | DEBUGP("nf_ct_q931: Progress\n"); | |
1033 | ||
1034 | if (progress->options & eProgress_UUIE_h245Address) { | |
1035 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, | |
1036 | &progress->h245Address); | |
1037 | if (ret < 0) | |
1038 | return -1; | |
1039 | } | |
1040 | ||
1041 | if (progress->options & eProgress_UUIE_fastStart) { | |
1042 | for (i = 0; i < progress->fastStart.count; i++) { | |
1043 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, | |
1044 | &progress->fastStart.item[i]); | |
1045 | if (ret < 0) | |
1046 | return -1; | |
1047 | } | |
1048 | } | |
1049 | ||
1050 | return 0; | |
1051 | } | |
1052 | ||
1053 | /****************************************************************************/ | |
1054 | static int process_q931(struct sk_buff **pskb, struct nf_conn *ct, | |
1055 | enum ip_conntrack_info ctinfo, | |
1056 | unsigned char **data, int dataoff, Q931 *q931) | |
1057 | { | |
1058 | H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; | |
1059 | int i; | |
1060 | int ret = 0; | |
1061 | ||
1062 | switch (pdu->h323_message_body.choice) { | |
1063 | case eH323_UU_PDU_h323_message_body_setup: | |
1064 | ret = process_setup(pskb, ct, ctinfo, data, dataoff, | |
1065 | &pdu->h323_message_body.setup); | |
1066 | break; | |
1067 | case eH323_UU_PDU_h323_message_body_callProceeding: | |
1068 | ret = process_callproceeding(pskb, ct, ctinfo, data, dataoff, | |
1069 | &pdu->h323_message_body. | |
1070 | callProceeding); | |
1071 | break; | |
1072 | case eH323_UU_PDU_h323_message_body_connect: | |
1073 | ret = process_connect(pskb, ct, ctinfo, data, dataoff, | |
1074 | &pdu->h323_message_body.connect); | |
1075 | break; | |
1076 | case eH323_UU_PDU_h323_message_body_alerting: | |
1077 | ret = process_alerting(pskb, ct, ctinfo, data, dataoff, | |
1078 | &pdu->h323_message_body.alerting); | |
1079 | break; | |
f587de0e PM |
1080 | case eH323_UU_PDU_h323_message_body_facility: |
1081 | ret = process_facility(pskb, ct, ctinfo, data, dataoff, | |
1082 | &pdu->h323_message_body.facility); | |
1083 | break; | |
1084 | case eH323_UU_PDU_h323_message_body_progress: | |
1085 | ret = process_progress(pskb, ct, ctinfo, data, dataoff, | |
1086 | &pdu->h323_message_body.progress); | |
1087 | break; | |
1088 | default: | |
1089 | DEBUGP("nf_ct_q931: Q.931 signal %d\n", | |
1090 | pdu->h323_message_body.choice); | |
1091 | break; | |
1092 | } | |
1093 | ||
1094 | if (ret < 0) | |
1095 | return -1; | |
1096 | ||
1097 | if (pdu->options & eH323_UU_PDU_h245Control) { | |
1098 | for (i = 0; i < pdu->h245Control.count; i++) { | |
1099 | ret = process_h245(pskb, ct, ctinfo, data, dataoff, | |
1100 | &pdu->h245Control.item[i]); | |
1101 | if (ret < 0) | |
1102 | return -1; | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | return 0; | |
1107 | } | |
1108 | ||
1109 | /****************************************************************************/ | |
1110 | static int q931_help(struct sk_buff **pskb, unsigned int protoff, | |
1111 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) | |
1112 | { | |
1113 | static Q931 q931; | |
1114 | unsigned char *data = NULL; | |
1115 | int datalen; | |
1116 | int dataoff; | |
1117 | int ret; | |
1118 | ||
1119 | /* Until there's been traffic both ways, don't look in packets. */ | |
1120 | if (ctinfo != IP_CT_ESTABLISHED && | |
1121 | ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) { | |
1122 | return NF_ACCEPT; | |
1123 | } | |
1124 | DEBUGP("nf_ct_q931: skblen = %u\n", (*pskb)->len); | |
1125 | ||
1126 | spin_lock_bh(&nf_h323_lock); | |
1127 | ||
1128 | /* Process each TPKT */ | |
1129 | while (get_tpkt_data(pskb, protoff, ct, ctinfo, | |
1130 | &data, &datalen, &dataoff)) { | |
1131 | DEBUGP("nf_ct_q931: TPKT len=%d ", datalen); | |
1132 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); | |
1133 | ||
1134 | /* Decode Q.931 signal */ | |
1135 | ret = DecodeQ931(data, datalen, &q931); | |
1136 | if (ret < 0) { | |
91e8db80 PM |
1137 | DEBUGP("nf_ct_q931: decoding error: %s\n", |
1138 | ret == H323_ERROR_BOUND ? | |
1139 | "out of bound" : "out of range"); | |
f587de0e PM |
1140 | /* We don't drop when decoding error */ |
1141 | break; | |
1142 | } | |
1143 | ||
1144 | /* Process Q.931 signal */ | |
1145 | if (process_q931(pskb, ct, ctinfo, &data, dataoff, &q931) < 0) | |
1146 | goto drop; | |
1147 | } | |
1148 | ||
1149 | spin_unlock_bh(&nf_h323_lock); | |
1150 | return NF_ACCEPT; | |
1151 | ||
1152 | drop: | |
1153 | spin_unlock_bh(&nf_h323_lock); | |
1154 | if (net_ratelimit()) | |
1155 | printk("nf_ct_q931: packet dropped\n"); | |
1156 | return NF_DROP; | |
1157 | } | |
1158 | ||
1159 | /****************************************************************************/ | |
1160 | static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { | |
1161 | { | |
1162 | .name = "Q.931", | |
1163 | .me = THIS_MODULE, | |
1164 | /* T.120 and H.245 */ | |
1165 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, | |
1166 | .timeout = 240, | |
1167 | .tuple.src.l3num = AF_INET, | |
1168 | .tuple.src.u.tcp.port = __constant_htons(Q931_PORT), | |
1169 | .tuple.dst.protonum = IPPROTO_TCP, | |
f587de0e PM |
1170 | .help = q931_help |
1171 | }, | |
1172 | { | |
1173 | .name = "Q.931", | |
1174 | .me = THIS_MODULE, | |
1175 | /* T.120 and H.245 */ | |
1176 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, | |
1177 | .timeout = 240, | |
1178 | .tuple.src.l3num = AF_INET6, | |
1179 | .tuple.src.u.tcp.port = __constant_htons(Q931_PORT), | |
1180 | .tuple.dst.protonum = IPPROTO_TCP, | |
f587de0e PM |
1181 | .help = q931_help |
1182 | }, | |
1183 | }; | |
1184 | ||
1185 | /****************************************************************************/ | |
1186 | static unsigned char *get_udp_data(struct sk_buff **pskb, unsigned int protoff, | |
1187 | int *datalen) | |
1188 | { | |
1189 | struct udphdr _uh, *uh; | |
1190 | int dataoff; | |
1191 | ||
1192 | uh = skb_header_pointer(*pskb, protoff, sizeof(_uh), &_uh); | |
1193 | if (uh == NULL) | |
1194 | return NULL; | |
1195 | dataoff = protoff + sizeof(_uh); | |
1196 | if (dataoff >= (*pskb)->len) | |
1197 | return NULL; | |
1198 | *datalen = (*pskb)->len - dataoff; | |
1199 | return skb_header_pointer(*pskb, dataoff, *datalen, h323_buffer); | |
1200 | } | |
1201 | ||
1202 | /****************************************************************************/ | |
1203 | static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, | |
1204 | union nf_conntrack_address *addr, | |
1205 | __be16 port) | |
1206 | { | |
1207 | struct nf_conntrack_expect *exp; | |
1208 | struct nf_conntrack_tuple tuple; | |
1209 | ||
1210 | memset(&tuple.src.u3, 0, sizeof(tuple.src.u3)); | |
1211 | tuple.src.u.tcp.port = 0; | |
1212 | memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3)); | |
1213 | tuple.dst.u.tcp.port = port; | |
1214 | tuple.dst.protonum = IPPROTO_TCP; | |
1215 | ||
6823645d | 1216 | exp = __nf_ct_expect_find(&tuple); |
f587de0e PM |
1217 | if (exp && exp->master == ct) |
1218 | return exp; | |
1219 | return NULL; | |
1220 | } | |
1221 | ||
1222 | /****************************************************************************/ | |
1223 | static int set_expect_timeout(struct nf_conntrack_expect *exp, | |
1224 | unsigned timeout) | |
1225 | { | |
1226 | if (!exp || !del_timer(&exp->timeout)) | |
1227 | return 0; | |
1228 | ||
1229 | exp->timeout.expires = jiffies + timeout * HZ; | |
1230 | add_timer(&exp->timeout); | |
1231 | ||
1232 | return 1; | |
1233 | } | |
1234 | ||
1235 | /****************************************************************************/ | |
1236 | static int expect_q931(struct sk_buff **pskb, struct nf_conn *ct, | |
1237 | enum ip_conntrack_info ctinfo, | |
1238 | unsigned char **data, | |
1239 | TransportAddress *taddr, int count) | |
1240 | { | |
1241 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1242 | int dir = CTINFO2DIR(ctinfo); | |
1243 | int ret = 0; | |
1244 | int i; | |
1245 | __be16 port; | |
1246 | union nf_conntrack_address addr; | |
1247 | struct nf_conntrack_expect *exp; | |
1248 | typeof(nat_q931_hook) nat_q931; | |
1249 | ||
1250 | /* Look for the first related address */ | |
1251 | for (i = 0; i < count; i++) { | |
1252 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && | |
1253 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, | |
601e68e1 | 1254 | sizeof(addr)) == 0 && port != 0) |
f587de0e PM |
1255 | break; |
1256 | } | |
1257 | ||
1258 | if (i >= count) /* Not found */ | |
1259 | return 0; | |
1260 | ||
1261 | /* Create expect for Q.931 */ | |
6823645d | 1262 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1263 | return -1; |
6823645d PM |
1264 | nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
1265 | gkrouted_only ? /* only accept calls from GK? */ | |
1266 | &ct->tuplehash[!dir].tuple.src.u3 : NULL, | |
1267 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1268 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1269 | exp->helper = nf_conntrack_helper_q931; |
1270 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ | |
1271 | ||
1272 | nat_q931 = rcu_dereference(nat_q931_hook); | |
1273 | if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */ | |
1274 | ret = nat_q931(pskb, ct, ctinfo, data, taddr, i, port, exp); | |
1275 | } else { /* Conntrack only */ | |
6823645d | 1276 | if (nf_ct_expect_related(exp) == 0) { |
f587de0e PM |
1277 | DEBUGP("nf_ct_ras: expect Q.931 "); |
1278 | NF_CT_DUMP_TUPLE(&exp->tuple); | |
1279 | ||
1280 | /* Save port for looking up expect in processing RCF */ | |
1281 | info->sig_port[dir] = port; | |
1282 | } else | |
1283 | ret = -1; | |
1284 | } | |
1285 | ||
6823645d | 1286 | nf_ct_expect_put(exp); |
f587de0e PM |
1287 | |
1288 | return ret; | |
1289 | } | |
1290 | ||
1291 | /****************************************************************************/ | |
1292 | static int process_grq(struct sk_buff **pskb, struct nf_conn *ct, | |
1293 | enum ip_conntrack_info ctinfo, | |
1294 | unsigned char **data, GatekeeperRequest *grq) | |
1295 | { | |
1296 | typeof(set_ras_addr_hook) set_ras_addr; | |
1297 | ||
1298 | DEBUGP("nf_ct_ras: GRQ\n"); | |
1299 | ||
1300 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1301 | if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */ | |
1302 | return set_ras_addr(pskb, ct, ctinfo, data, | |
1303 | &grq->rasAddress, 1); | |
1304 | return 0; | |
1305 | } | |
1306 | ||
1307 | /****************************************************************************/ | |
1308 | static int process_gcf(struct sk_buff **pskb, struct nf_conn *ct, | |
1309 | enum ip_conntrack_info ctinfo, | |
1310 | unsigned char **data, GatekeeperConfirm *gcf) | |
1311 | { | |
1312 | int dir = CTINFO2DIR(ctinfo); | |
1313 | int ret = 0; | |
1314 | __be16 port; | |
1315 | union nf_conntrack_address addr; | |
1316 | struct nf_conntrack_expect *exp; | |
1317 | ||
1318 | DEBUGP("nf_ct_ras: GCF\n"); | |
1319 | ||
1320 | if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) | |
1321 | return 0; | |
1322 | ||
1323 | /* Registration port is the same as discovery port */ | |
1324 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && | |
1325 | port == ct->tuplehash[dir].tuple.src.u.udp.port) | |
1326 | return 0; | |
1327 | ||
1328 | /* Avoid RAS expectation loops. A GCF is never expected. */ | |
1329 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) | |
1330 | return 0; | |
1331 | ||
1332 | /* Need new expect */ | |
6823645d | 1333 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1334 | return -1; |
6823645d PM |
1335 | nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
1336 | &ct->tuplehash[!dir].tuple.src.u3, &addr, | |
1337 | IPPROTO_UDP, NULL, &port); | |
f587de0e PM |
1338 | exp->helper = nf_conntrack_helper_ras; |
1339 | ||
6823645d | 1340 | if (nf_ct_expect_related(exp) == 0) { |
f587de0e PM |
1341 | DEBUGP("nf_ct_ras: expect RAS "); |
1342 | NF_CT_DUMP_TUPLE(&exp->tuple); | |
1343 | } else | |
1344 | ret = -1; | |
1345 | ||
6823645d | 1346 | nf_ct_expect_put(exp); |
f587de0e PM |
1347 | |
1348 | return ret; | |
1349 | } | |
1350 | ||
1351 | /****************************************************************************/ | |
1352 | static int process_rrq(struct sk_buff **pskb, struct nf_conn *ct, | |
1353 | enum ip_conntrack_info ctinfo, | |
1354 | unsigned char **data, RegistrationRequest *rrq) | |
1355 | { | |
1356 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1357 | int ret; | |
1358 | typeof(set_ras_addr_hook) set_ras_addr; | |
1359 | ||
1360 | DEBUGP("nf_ct_ras: RRQ\n"); | |
1361 | ||
1362 | ret = expect_q931(pskb, ct, ctinfo, data, | |
1363 | rrq->callSignalAddress.item, | |
1364 | rrq->callSignalAddress.count); | |
1365 | if (ret < 0) | |
1366 | return -1; | |
1367 | ||
1368 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1369 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { | |
1370 | ret = set_ras_addr(pskb, ct, ctinfo, data, | |
1371 | rrq->rasAddress.item, | |
1372 | rrq->rasAddress.count); | |
1373 | if (ret < 0) | |
1374 | return -1; | |
1375 | } | |
1376 | ||
1377 | if (rrq->options & eRegistrationRequest_timeToLive) { | |
1378 | DEBUGP("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); | |
1379 | info->timeout = rrq->timeToLive; | |
1380 | } else | |
1381 | info->timeout = default_rrq_ttl; | |
1382 | ||
1383 | return 0; | |
1384 | } | |
1385 | ||
1386 | /****************************************************************************/ | |
1387 | static int process_rcf(struct sk_buff **pskb, struct nf_conn *ct, | |
1388 | enum ip_conntrack_info ctinfo, | |
1389 | unsigned char **data, RegistrationConfirm *rcf) | |
1390 | { | |
1391 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1392 | int dir = CTINFO2DIR(ctinfo); | |
1393 | int ret; | |
1394 | struct nf_conntrack_expect *exp; | |
1395 | typeof(set_sig_addr_hook) set_sig_addr; | |
1396 | ||
1397 | DEBUGP("nf_ct_ras: RCF\n"); | |
1398 | ||
1399 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1400 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
1401 | ret = set_sig_addr(pskb, ct, ctinfo, data, | |
1402 | rcf->callSignalAddress.item, | |
1403 | rcf->callSignalAddress.count); | |
1404 | if (ret < 0) | |
1405 | return -1; | |
1406 | } | |
1407 | ||
1408 | if (rcf->options & eRegistrationConfirm_timeToLive) { | |
1409 | DEBUGP("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); | |
1410 | info->timeout = rcf->timeToLive; | |
1411 | } | |
1412 | ||
1413 | if (info->timeout > 0) { | |
1414 | DEBUGP | |
1415 | ("nf_ct_ras: set RAS connection timeout to %u seconds\n", | |
1416 | info->timeout); | |
1417 | nf_ct_refresh(ct, *pskb, info->timeout * HZ); | |
1418 | ||
1419 | /* Set expect timeout */ | |
1420 | read_lock_bh(&nf_conntrack_lock); | |
1421 | exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, | |
1422 | info->sig_port[!dir]); | |
1423 | if (exp) { | |
1424 | DEBUGP("nf_ct_ras: set Q.931 expect " | |
1425 | "timeout to %u seconds for", | |
1426 | info->timeout); | |
1427 | NF_CT_DUMP_TUPLE(&exp->tuple); | |
1428 | set_expect_timeout(exp, info->timeout); | |
1429 | } | |
1430 | read_unlock_bh(&nf_conntrack_lock); | |
1431 | } | |
1432 | ||
1433 | return 0; | |
1434 | } | |
1435 | ||
1436 | /****************************************************************************/ | |
1437 | static int process_urq(struct sk_buff **pskb, struct nf_conn *ct, | |
1438 | enum ip_conntrack_info ctinfo, | |
1439 | unsigned char **data, UnregistrationRequest *urq) | |
1440 | { | |
1441 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1442 | int dir = CTINFO2DIR(ctinfo); | |
1443 | int ret; | |
1444 | typeof(set_sig_addr_hook) set_sig_addr; | |
1445 | ||
1446 | DEBUGP("nf_ct_ras: URQ\n"); | |
1447 | ||
1448 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1449 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
1450 | ret = set_sig_addr(pskb, ct, ctinfo, data, | |
1451 | urq->callSignalAddress.item, | |
1452 | urq->callSignalAddress.count); | |
1453 | if (ret < 0) | |
1454 | return -1; | |
1455 | } | |
1456 | ||
1457 | /* Clear old expect */ | |
1458 | nf_ct_remove_expectations(ct); | |
1459 | info->sig_port[dir] = 0; | |
1460 | info->sig_port[!dir] = 0; | |
1461 | ||
1462 | /* Give it 30 seconds for UCF or URJ */ | |
1463 | nf_ct_refresh(ct, *pskb, 30 * HZ); | |
1464 | ||
1465 | return 0; | |
1466 | } | |
1467 | ||
1468 | /****************************************************************************/ | |
1469 | static int process_arq(struct sk_buff **pskb, struct nf_conn *ct, | |
1470 | enum ip_conntrack_info ctinfo, | |
1471 | unsigned char **data, AdmissionRequest *arq) | |
1472 | { | |
1473 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1474 | int dir = CTINFO2DIR(ctinfo); | |
1475 | __be16 port; | |
1476 | union nf_conntrack_address addr; | |
1477 | typeof(set_h225_addr_hook) set_h225_addr; | |
1478 | ||
1479 | DEBUGP("nf_ct_ras: ARQ\n"); | |
1480 | ||
1481 | set_h225_addr = rcu_dereference(set_h225_addr_hook); | |
1482 | if ((arq->options & eAdmissionRequest_destCallSignalAddress) && | |
1483 | get_h225_addr(ct, *data, &arq->destCallSignalAddress, | |
601e68e1 | 1484 | &addr, &port) && |
f587de0e PM |
1485 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
1486 | port == info->sig_port[dir] && | |
1487 | set_h225_addr && ct->status & IPS_NAT_MASK) { | |
1488 | /* Answering ARQ */ | |
1489 | return set_h225_addr(pskb, data, 0, | |
1490 | &arq->destCallSignalAddress, | |
1491 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1492 | info->sig_port[!dir]); | |
1493 | } | |
1494 | ||
1495 | if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && | |
1496 | get_h225_addr(ct, *data, &arq->srcCallSignalAddress, | |
601e68e1 | 1497 | &addr, &port) && |
f587de0e PM |
1498 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
1499 | set_h225_addr && ct->status & IPS_NAT_MASK) { | |
1500 | /* Calling ARQ */ | |
1501 | return set_h225_addr(pskb, data, 0, | |
1502 | &arq->srcCallSignalAddress, | |
1503 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1504 | port); | |
1505 | } | |
1506 | ||
1507 | return 0; | |
1508 | } | |
1509 | ||
1510 | /****************************************************************************/ | |
1511 | static int process_acf(struct sk_buff **pskb, struct nf_conn *ct, | |
1512 | enum ip_conntrack_info ctinfo, | |
1513 | unsigned char **data, AdmissionConfirm *acf) | |
1514 | { | |
1515 | int dir = CTINFO2DIR(ctinfo); | |
1516 | int ret = 0; | |
1517 | __be16 port; | |
1518 | union nf_conntrack_address addr; | |
1519 | struct nf_conntrack_expect *exp; | |
1520 | typeof(set_sig_addr_hook) set_sig_addr; | |
1521 | ||
1522 | DEBUGP("nf_ct_ras: ACF\n"); | |
1523 | ||
1524 | if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, | |
1525 | &addr, &port)) | |
1526 | return 0; | |
1527 | ||
1528 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { | |
1529 | /* Answering ACF */ | |
1530 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1531 | if (set_sig_addr && ct->status & IPS_NAT_MASK) | |
1532 | return set_sig_addr(pskb, ct, ctinfo, data, | |
1533 | &acf->destCallSignalAddress, 1); | |
1534 | return 0; | |
1535 | } | |
1536 | ||
1537 | /* Need new expect */ | |
6823645d | 1538 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1539 | return -1; |
6823645d PM |
1540 | nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
1541 | &ct->tuplehash[!dir].tuple.src.u3, &addr, | |
1542 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1543 | exp->flags = NF_CT_EXPECT_PERMANENT; |
1544 | exp->helper = nf_conntrack_helper_q931; | |
1545 | ||
6823645d | 1546 | if (nf_ct_expect_related(exp) == 0) { |
f587de0e PM |
1547 | DEBUGP("nf_ct_ras: expect Q.931 "); |
1548 | NF_CT_DUMP_TUPLE(&exp->tuple); | |
1549 | } else | |
1550 | ret = -1; | |
1551 | ||
6823645d | 1552 | nf_ct_expect_put(exp); |
f587de0e PM |
1553 | |
1554 | return ret; | |
1555 | } | |
1556 | ||
1557 | /****************************************************************************/ | |
1558 | static int process_lrq(struct sk_buff **pskb, struct nf_conn *ct, | |
1559 | enum ip_conntrack_info ctinfo, | |
1560 | unsigned char **data, LocationRequest *lrq) | |
1561 | { | |
1562 | typeof(set_ras_addr_hook) set_ras_addr; | |
1563 | ||
1564 | DEBUGP("nf_ct_ras: LRQ\n"); | |
1565 | ||
1566 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1567 | if (set_ras_addr && ct->status & IPS_NAT_MASK) | |
1568 | return set_ras_addr(pskb, ct, ctinfo, data, | |
1569 | &lrq->replyAddress, 1); | |
1570 | return 0; | |
1571 | } | |
1572 | ||
1573 | /****************************************************************************/ | |
1574 | static int process_lcf(struct sk_buff **pskb, struct nf_conn *ct, | |
1575 | enum ip_conntrack_info ctinfo, | |
1576 | unsigned char **data, LocationConfirm *lcf) | |
1577 | { | |
1578 | int dir = CTINFO2DIR(ctinfo); | |
1579 | int ret = 0; | |
1580 | __be16 port; | |
1581 | union nf_conntrack_address addr; | |
1582 | struct nf_conntrack_expect *exp; | |
1583 | ||
1584 | DEBUGP("nf_ct_ras: LCF\n"); | |
1585 | ||
1586 | if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, | |
1587 | &addr, &port)) | |
1588 | return 0; | |
1589 | ||
1590 | /* Need new expect for call signal */ | |
6823645d | 1591 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1592 | return -1; |
6823645d PM |
1593 | nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
1594 | &ct->tuplehash[!dir].tuple.src.u3, &addr, | |
1595 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1596 | exp->flags = NF_CT_EXPECT_PERMANENT; |
1597 | exp->helper = nf_conntrack_helper_q931; | |
1598 | ||
6823645d | 1599 | if (nf_ct_expect_related(exp) == 0) { |
f587de0e PM |
1600 | DEBUGP("nf_ct_ras: expect Q.931 "); |
1601 | NF_CT_DUMP_TUPLE(&exp->tuple); | |
1602 | } else | |
1603 | ret = -1; | |
1604 | ||
6823645d | 1605 | nf_ct_expect_put(exp); |
f587de0e PM |
1606 | |
1607 | /* Ignore rasAddress */ | |
1608 | ||
1609 | return ret; | |
1610 | } | |
1611 | ||
1612 | /****************************************************************************/ | |
1613 | static int process_irr(struct sk_buff **pskb, struct nf_conn *ct, | |
1614 | enum ip_conntrack_info ctinfo, | |
1615 | unsigned char **data, InfoRequestResponse *irr) | |
1616 | { | |
1617 | int ret; | |
1618 | typeof(set_ras_addr_hook) set_ras_addr; | |
1619 | typeof(set_sig_addr_hook) set_sig_addr; | |
1620 | ||
1621 | DEBUGP("nf_ct_ras: IRR\n"); | |
1622 | ||
1623 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1624 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { | |
1625 | ret = set_ras_addr(pskb, ct, ctinfo, data, | |
1626 | &irr->rasAddress, 1); | |
1627 | if (ret < 0) | |
1628 | return -1; | |
1629 | } | |
1630 | ||
1631 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1632 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
1633 | ret = set_sig_addr(pskb, ct, ctinfo, data, | |
1634 | irr->callSignalAddress.item, | |
1635 | irr->callSignalAddress.count); | |
1636 | if (ret < 0) | |
1637 | return -1; | |
1638 | } | |
1639 | ||
1640 | return 0; | |
1641 | } | |
1642 | ||
1643 | /****************************************************************************/ | |
1644 | static int process_ras(struct sk_buff **pskb, struct nf_conn *ct, | |
1645 | enum ip_conntrack_info ctinfo, | |
1646 | unsigned char **data, RasMessage *ras) | |
1647 | { | |
1648 | switch (ras->choice) { | |
1649 | case eRasMessage_gatekeeperRequest: | |
1650 | return process_grq(pskb, ct, ctinfo, data, | |
1651 | &ras->gatekeeperRequest); | |
1652 | case eRasMessage_gatekeeperConfirm: | |
1653 | return process_gcf(pskb, ct, ctinfo, data, | |
1654 | &ras->gatekeeperConfirm); | |
1655 | case eRasMessage_registrationRequest: | |
1656 | return process_rrq(pskb, ct, ctinfo, data, | |
1657 | &ras->registrationRequest); | |
1658 | case eRasMessage_registrationConfirm: | |
1659 | return process_rcf(pskb, ct, ctinfo, data, | |
1660 | &ras->registrationConfirm); | |
1661 | case eRasMessage_unregistrationRequest: | |
1662 | return process_urq(pskb, ct, ctinfo, data, | |
1663 | &ras->unregistrationRequest); | |
1664 | case eRasMessage_admissionRequest: | |
1665 | return process_arq(pskb, ct, ctinfo, data, | |
1666 | &ras->admissionRequest); | |
1667 | case eRasMessage_admissionConfirm: | |
1668 | return process_acf(pskb, ct, ctinfo, data, | |
1669 | &ras->admissionConfirm); | |
1670 | case eRasMessage_locationRequest: | |
1671 | return process_lrq(pskb, ct, ctinfo, data, | |
1672 | &ras->locationRequest); | |
1673 | case eRasMessage_locationConfirm: | |
1674 | return process_lcf(pskb, ct, ctinfo, data, | |
1675 | &ras->locationConfirm); | |
1676 | case eRasMessage_infoRequestResponse: | |
1677 | return process_irr(pskb, ct, ctinfo, data, | |
1678 | &ras->infoRequestResponse); | |
1679 | default: | |
1680 | DEBUGP("nf_ct_ras: RAS message %d\n", ras->choice); | |
1681 | break; | |
1682 | } | |
1683 | ||
1684 | return 0; | |
1685 | } | |
1686 | ||
1687 | /****************************************************************************/ | |
1688 | static int ras_help(struct sk_buff **pskb, unsigned int protoff, | |
1689 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) | |
1690 | { | |
1691 | static RasMessage ras; | |
1692 | unsigned char *data; | |
1693 | int datalen = 0; | |
1694 | int ret; | |
1695 | ||
1696 | DEBUGP("nf_ct_ras: skblen = %u\n", (*pskb)->len); | |
1697 | ||
1698 | spin_lock_bh(&nf_h323_lock); | |
1699 | ||
1700 | /* Get UDP data */ | |
1701 | data = get_udp_data(pskb, protoff, &datalen); | |
1702 | if (data == NULL) | |
1703 | goto accept; | |
1704 | DEBUGP("nf_ct_ras: RAS message len=%d ", datalen); | |
1705 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); | |
1706 | ||
1707 | /* Decode RAS message */ | |
1708 | ret = DecodeRasMessage(data, datalen, &ras); | |
1709 | if (ret < 0) { | |
91e8db80 PM |
1710 | DEBUGP("nf_ct_ras: decoding error: %s\n", |
1711 | ret == H323_ERROR_BOUND ? | |
1712 | "out of bound" : "out of range"); | |
f587de0e PM |
1713 | goto accept; |
1714 | } | |
1715 | ||
1716 | /* Process RAS message */ | |
1717 | if (process_ras(pskb, ct, ctinfo, &data, &ras) < 0) | |
1718 | goto drop; | |
1719 | ||
1720 | accept: | |
1721 | spin_unlock_bh(&nf_h323_lock); | |
1722 | return NF_ACCEPT; | |
1723 | ||
1724 | drop: | |
1725 | spin_unlock_bh(&nf_h323_lock); | |
1726 | if (net_ratelimit()) | |
1727 | printk("nf_ct_ras: packet dropped\n"); | |
1728 | return NF_DROP; | |
1729 | } | |
1730 | ||
1731 | /****************************************************************************/ | |
1732 | static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { | |
1733 | { | |
1734 | .name = "RAS", | |
1735 | .me = THIS_MODULE, | |
1736 | .max_expected = 32, | |
1737 | .timeout = 240, | |
1738 | .tuple.src.l3num = AF_INET, | |
1739 | .tuple.src.u.udp.port = __constant_htons(RAS_PORT), | |
1740 | .tuple.dst.protonum = IPPROTO_UDP, | |
f587de0e PM |
1741 | .help = ras_help, |
1742 | }, | |
1743 | { | |
1744 | .name = "RAS", | |
1745 | .me = THIS_MODULE, | |
1746 | .max_expected = 32, | |
1747 | .timeout = 240, | |
1748 | .tuple.src.l3num = AF_INET6, | |
1749 | .tuple.src.u.udp.port = __constant_htons(RAS_PORT), | |
1750 | .tuple.dst.protonum = IPPROTO_UDP, | |
f587de0e PM |
1751 | .help = ras_help, |
1752 | }, | |
1753 | }; | |
1754 | ||
1755 | /****************************************************************************/ | |
1756 | static void __exit nf_conntrack_h323_fini(void) | |
1757 | { | |
1758 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]); | |
1759 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); | |
1760 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); | |
1761 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); | |
1762 | kfree(h323_buffer); | |
1763 | DEBUGP("nf_ct_h323: fini\n"); | |
1764 | } | |
1765 | ||
1766 | /****************************************************************************/ | |
1767 | static int __init nf_conntrack_h323_init(void) | |
1768 | { | |
1769 | int ret; | |
1770 | ||
1771 | h323_buffer = kmalloc(65536, GFP_KERNEL); | |
1772 | if (!h323_buffer) | |
1773 | return -ENOMEM; | |
1774 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]); | |
1775 | if (ret < 0) | |
1776 | goto err1; | |
1777 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]); | |
1778 | if (ret < 0) | |
1779 | goto err2; | |
1780 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]); | |
1781 | if (ret < 0) | |
1782 | goto err3; | |
1783 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]); | |
1784 | if (ret < 0) | |
1785 | goto err4; | |
1786 | DEBUGP("nf_ct_h323: init success\n"); | |
1787 | return 0; | |
1788 | ||
1789 | err4: | |
1790 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); | |
1791 | err3: | |
1792 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); | |
1793 | err2: | |
1794 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); | |
1795 | err1: | |
1796 | return ret; | |
1797 | } | |
1798 | ||
1799 | /****************************************************************************/ | |
1800 | module_init(nf_conntrack_h323_init); | |
1801 | module_exit(nf_conntrack_h323_fini); | |
1802 | ||
1803 | EXPORT_SYMBOL_GPL(get_h225_addr); | |
1804 | EXPORT_SYMBOL_GPL(set_h245_addr_hook); | |
1805 | EXPORT_SYMBOL_GPL(set_h225_addr_hook); | |
1806 | EXPORT_SYMBOL_GPL(set_sig_addr_hook); | |
1807 | EXPORT_SYMBOL_GPL(set_ras_addr_hook); | |
1808 | EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); | |
1809 | EXPORT_SYMBOL_GPL(nat_t120_hook); | |
1810 | EXPORT_SYMBOL_GPL(nat_h245_hook); | |
1811 | EXPORT_SYMBOL_GPL(nat_callforwarding_hook); | |
1812 | EXPORT_SYMBOL_GPL(nat_q931_hook); | |
1813 | ||
1814 | MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); | |
1815 | MODULE_DESCRIPTION("H.323 connection tracking helper"); | |
1816 | MODULE_LICENSE("GPL"); | |
1817 | MODULE_ALIAS("ip_conntrack_h323"); |