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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 | ||
f587de0e PM |
34 | /* Parameters */ |
35 | static unsigned int default_rrq_ttl __read_mostly = 300; | |
36 | module_param(default_rrq_ttl, uint, 0600); | |
37 | MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ"); | |
38 | ||
39 | static int gkrouted_only __read_mostly = 1; | |
40 | module_param(gkrouted_only, int, 0600); | |
41 | MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper"); | |
42 | ||
43 | static int callforward_filter __read_mostly = 1; | |
44 | module_param(callforward_filter, bool, 0600); | |
45 | MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations " | |
601e68e1 | 46 | "if both endpoints are on different sides " |
f587de0e PM |
47 | "(determined by routing information)"); |
48 | ||
49 | /* Hooks for NAT */ | |
3db05fea | 50 | int (*set_h245_addr_hook) (struct sk_buff *skb, |
f587de0e PM |
51 | unsigned char **data, int dataoff, |
52 | H245_TransportAddress *taddr, | |
53 | union nf_conntrack_address *addr, __be16 port) | |
54 | __read_mostly; | |
3db05fea | 55 | int (*set_h225_addr_hook) (struct sk_buff *skb, |
f587de0e PM |
56 | unsigned char **data, int dataoff, |
57 | TransportAddress *taddr, | |
58 | union nf_conntrack_address *addr, __be16 port) | |
59 | __read_mostly; | |
3db05fea | 60 | int (*set_sig_addr_hook) (struct sk_buff *skb, |
f587de0e PM |
61 | struct nf_conn *ct, |
62 | enum ip_conntrack_info ctinfo, | |
63 | unsigned char **data, | |
64 | TransportAddress *taddr, int count) __read_mostly; | |
3db05fea | 65 | int (*set_ras_addr_hook) (struct sk_buff *skb, |
f587de0e PM |
66 | struct nf_conn *ct, |
67 | enum ip_conntrack_info ctinfo, | |
68 | unsigned char **data, | |
69 | TransportAddress *taddr, int count) __read_mostly; | |
3db05fea | 70 | int (*nat_rtp_rtcp_hook) (struct sk_buff *skb, |
f587de0e PM |
71 | struct nf_conn *ct, |
72 | enum ip_conntrack_info ctinfo, | |
73 | unsigned char **data, int dataoff, | |
74 | H245_TransportAddress *taddr, | |
75 | __be16 port, __be16 rtp_port, | |
76 | struct nf_conntrack_expect *rtp_exp, | |
77 | struct nf_conntrack_expect *rtcp_exp) __read_mostly; | |
3db05fea | 78 | int (*nat_t120_hook) (struct sk_buff *skb, |
f587de0e PM |
79 | struct nf_conn *ct, |
80 | enum ip_conntrack_info ctinfo, | |
81 | unsigned char **data, int dataoff, | |
82 | H245_TransportAddress *taddr, __be16 port, | |
83 | struct nf_conntrack_expect *exp) __read_mostly; | |
3db05fea | 84 | int (*nat_h245_hook) (struct sk_buff *skb, |
f587de0e PM |
85 | struct nf_conn *ct, |
86 | enum ip_conntrack_info ctinfo, | |
87 | unsigned char **data, int dataoff, | |
88 | TransportAddress *taddr, __be16 port, | |
89 | struct nf_conntrack_expect *exp) __read_mostly; | |
3db05fea | 90 | int (*nat_callforwarding_hook) (struct sk_buff *skb, |
f587de0e PM |
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; | |
3db05fea | 96 | int (*nat_q931_hook) (struct sk_buff *skb, |
f587de0e PM |
97 | struct nf_conn *ct, |
98 | enum ip_conntrack_info ctinfo, | |
99 | unsigned char **data, TransportAddress *taddr, int idx, | |
100 | __be16 port, struct nf_conntrack_expect *exp) | |
101 | __read_mostly; | |
102 | ||
103 | static DEFINE_SPINLOCK(nf_h323_lock); | |
104 | static char *h323_buffer; | |
105 | ||
106 | static struct nf_conntrack_helper nf_conntrack_helper_h245; | |
107 | static struct nf_conntrack_helper nf_conntrack_helper_q931[]; | |
108 | static struct nf_conntrack_helper nf_conntrack_helper_ras[]; | |
109 | ||
110 | /****************************************************************************/ | |
3db05fea | 111 | static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
112 | struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
113 | unsigned char **data, int *datalen, int *dataoff) | |
114 | { | |
115 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
116 | int dir = CTINFO2DIR(ctinfo); | |
117 | struct tcphdr _tcph, *th; | |
118 | int tcpdatalen; | |
119 | int tcpdataoff; | |
120 | unsigned char *tpkt; | |
121 | int tpktlen; | |
122 | int tpktoff; | |
123 | ||
124 | /* Get TCP header */ | |
3db05fea | 125 | th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph); |
f587de0e PM |
126 | if (th == NULL) |
127 | return 0; | |
128 | ||
129 | /* Get TCP data offset */ | |
130 | tcpdataoff = protoff + th->doff * 4; | |
131 | ||
132 | /* Get TCP data length */ | |
3db05fea | 133 | tcpdatalen = skb->len - tcpdataoff; |
f587de0e PM |
134 | if (tcpdatalen <= 0) /* No TCP data */ |
135 | goto clear_out; | |
136 | ||
137 | if (*data == NULL) { /* first TPKT */ | |
138 | /* Get first TPKT pointer */ | |
3db05fea | 139 | tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen, |
f587de0e PM |
140 | h323_buffer); |
141 | BUG_ON(tpkt == NULL); | |
142 | ||
143 | /* Validate TPKT identifier */ | |
144 | if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) { | |
145 | /* Netmeeting sends TPKT header and data separately */ | |
146 | if (info->tpkt_len[dir] > 0) { | |
0d53778e PM |
147 | pr_debug("nf_ct_h323: previous packet " |
148 | "indicated separate TPKT data of %hu " | |
149 | "bytes\n", info->tpkt_len[dir]); | |
f587de0e PM |
150 | if (info->tpkt_len[dir] <= tcpdatalen) { |
151 | /* Yes, there was a TPKT header | |
152 | * received */ | |
153 | *data = tpkt; | |
154 | *datalen = info->tpkt_len[dir]; | |
155 | *dataoff = 0; | |
156 | goto out; | |
157 | } | |
158 | ||
159 | /* Fragmented TPKT */ | |
0d53778e | 160 | pr_debug("nf_ct_h323: fragmented TPKT\n"); |
f587de0e PM |
161 | goto clear_out; |
162 | } | |
163 | ||
164 | /* It is not even a TPKT */ | |
165 | return 0; | |
166 | } | |
167 | tpktoff = 0; | |
168 | } else { /* Next TPKT */ | |
169 | tpktoff = *dataoff + *datalen; | |
170 | tcpdatalen -= tpktoff; | |
171 | if (tcpdatalen <= 4) /* No more TPKT */ | |
172 | goto clear_out; | |
173 | tpkt = *data + *datalen; | |
174 | ||
175 | /* Validate TPKT identifier */ | |
176 | if (tpkt[0] != 0x03 || tpkt[1] != 0) | |
177 | goto clear_out; | |
178 | } | |
179 | ||
180 | /* Validate TPKT length */ | |
181 | tpktlen = tpkt[2] * 256 + tpkt[3]; | |
182 | if (tpktlen < 4) | |
183 | goto clear_out; | |
184 | if (tpktlen > tcpdatalen) { | |
185 | if (tcpdatalen == 4) { /* Separate TPKT header */ | |
186 | /* Netmeeting sends TPKT header and data separately */ | |
0d53778e PM |
187 | pr_debug("nf_ct_h323: separate TPKT header indicates " |
188 | "there will be TPKT data of %hu bytes\n", | |
189 | tpktlen - 4); | |
f587de0e PM |
190 | info->tpkt_len[dir] = tpktlen - 4; |
191 | return 0; | |
192 | } | |
193 | ||
194 | if (net_ratelimit()) | |
195 | printk("nf_ct_h323: incomplete TPKT (fragmented?)\n"); | |
196 | goto clear_out; | |
197 | } | |
198 | ||
199 | /* This is the encapsulated data */ | |
200 | *data = tpkt + 4; | |
201 | *datalen = tpktlen - 4; | |
202 | *dataoff = tpktoff + 4; | |
203 | ||
204 | out: | |
205 | /* Clear TPKT length */ | |
206 | info->tpkt_len[dir] = 0; | |
207 | return 1; | |
208 | ||
209 | clear_out: | |
210 | info->tpkt_len[dir] = 0; | |
211 | return 0; | |
212 | } | |
213 | ||
214 | /****************************************************************************/ | |
215 | static int get_h245_addr(struct nf_conn *ct, unsigned char *data, | |
216 | H245_TransportAddress *taddr, | |
217 | union nf_conntrack_address *addr, __be16 *port) | |
218 | { | |
219 | unsigned char *p; | |
220 | int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
221 | int len; | |
222 | ||
223 | if (taddr->choice != eH245_TransportAddress_unicastAddress) | |
224 | return 0; | |
225 | ||
226 | switch (taddr->unicastAddress.choice) { | |
227 | case eUnicastAddress_iPAddress: | |
228 | if (family != AF_INET) | |
229 | return 0; | |
230 | p = data + taddr->unicastAddress.iPAddress.network; | |
231 | len = 4; | |
232 | break; | |
233 | case eUnicastAddress_iP6Address: | |
234 | if (family != AF_INET6) | |
235 | return 0; | |
236 | p = data + taddr->unicastAddress.iP6Address.network; | |
237 | len = 16; | |
238 | break; | |
239 | default: | |
240 | return 0; | |
241 | } | |
242 | ||
243 | memcpy(addr, p, len); | |
244 | memset((void *)addr + len, 0, sizeof(*addr) - len); | |
245 | memcpy(port, p + len, sizeof(__be16)); | |
246 | ||
247 | return 1; | |
248 | } | |
249 | ||
250 | /****************************************************************************/ | |
3db05fea | 251 | static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
252 | enum ip_conntrack_info ctinfo, |
253 | unsigned char **data, int dataoff, | |
254 | H245_TransportAddress *taddr) | |
255 | { | |
256 | int dir = CTINFO2DIR(ctinfo); | |
257 | int ret = 0; | |
258 | __be16 port; | |
259 | __be16 rtp_port, rtcp_port; | |
260 | union nf_conntrack_address addr; | |
261 | struct nf_conntrack_expect *rtp_exp; | |
262 | struct nf_conntrack_expect *rtcp_exp; | |
263 | typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp; | |
264 | ||
265 | /* Read RTP or RTCP address */ | |
266 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || | |
267 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
268 | port == 0) | |
269 | return 0; | |
270 | ||
271 | /* RTP port is even */ | |
272 | port &= htons(~1); | |
273 | rtp_port = port; | |
274 | rtcp_port = htons(ntohs(port) + 1); | |
275 | ||
276 | /* Create expect for RTP */ | |
6823645d | 277 | if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 278 | return -1; |
6823645d PM |
279 | nf_ct_expect_init(rtp_exp, ct->tuplehash[!dir].tuple.src.l3num, |
280 | &ct->tuplehash[!dir].tuple.src.u3, | |
281 | &ct->tuplehash[!dir].tuple.dst.u3, | |
282 | IPPROTO_UDP, NULL, &rtp_port); | |
f587de0e PM |
283 | |
284 | /* Create expect for RTCP */ | |
6823645d PM |
285 | if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) { |
286 | nf_ct_expect_put(rtp_exp); | |
f587de0e PM |
287 | return -1; |
288 | } | |
6823645d PM |
289 | nf_ct_expect_init(rtcp_exp, ct->tuplehash[!dir].tuple.src.l3num, |
290 | &ct->tuplehash[!dir].tuple.src.u3, | |
291 | &ct->tuplehash[!dir].tuple.dst.u3, | |
292 | IPPROTO_UDP, NULL, &rtcp_port); | |
f587de0e PM |
293 | |
294 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
601e68e1 | 295 | &ct->tuplehash[!dir].tuple.dst.u3, |
f587de0e PM |
296 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
297 | (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) && | |
298 | ct->status & IPS_NAT_MASK) { | |
299 | /* NAT needed */ | |
3db05fea | 300 | ret = nat_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
301 | taddr, port, rtp_port, rtp_exp, rtcp_exp); |
302 | } else { /* Conntrack only */ | |
6823645d PM |
303 | if (nf_ct_expect_related(rtp_exp) == 0) { |
304 | if (nf_ct_expect_related(rtcp_exp) == 0) { | |
0d53778e | 305 | pr_debug("nf_ct_h323: expect RTP "); |
f587de0e | 306 | NF_CT_DUMP_TUPLE(&rtp_exp->tuple); |
0d53778e | 307 | pr_debug("nf_ct_h323: expect RTCP "); |
f587de0e PM |
308 | NF_CT_DUMP_TUPLE(&rtcp_exp->tuple); |
309 | } else { | |
6823645d | 310 | nf_ct_unexpect_related(rtp_exp); |
f587de0e PM |
311 | ret = -1; |
312 | } | |
313 | } else | |
314 | ret = -1; | |
315 | } | |
316 | ||
6823645d PM |
317 | nf_ct_expect_put(rtp_exp); |
318 | nf_ct_expect_put(rtcp_exp); | |
f587de0e PM |
319 | |
320 | return ret; | |
321 | } | |
322 | ||
323 | /****************************************************************************/ | |
3db05fea | 324 | static int expect_t120(struct sk_buff *skb, |
f587de0e PM |
325 | struct nf_conn *ct, |
326 | enum ip_conntrack_info ctinfo, | |
327 | unsigned char **data, int dataoff, | |
328 | H245_TransportAddress *taddr) | |
329 | { | |
330 | int dir = CTINFO2DIR(ctinfo); | |
331 | int ret = 0; | |
332 | __be16 port; | |
333 | union nf_conntrack_address addr; | |
334 | struct nf_conntrack_expect *exp; | |
335 | typeof(nat_t120_hook) nat_t120; | |
336 | ||
337 | /* Read T.120 address */ | |
338 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || | |
339 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
340 | port == 0) | |
341 | return 0; | |
342 | ||
343 | /* Create expect for T.120 connections */ | |
6823645d | 344 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 345 | return -1; |
6823645d PM |
346 | nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
347 | &ct->tuplehash[!dir].tuple.src.u3, | |
348 | &ct->tuplehash[!dir].tuple.dst.u3, | |
349 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
350 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */ |
351 | ||
352 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
353 | &ct->tuplehash[!dir].tuple.dst.u3, | |
354 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
355 | (nat_t120 = rcu_dereference(nat_t120_hook)) && | |
356 | ct->status & IPS_NAT_MASK) { | |
357 | /* NAT needed */ | |
3db05fea | 358 | ret = nat_t120(skb, ct, ctinfo, data, dataoff, taddr, |
f587de0e PM |
359 | port, exp); |
360 | } else { /* Conntrack only */ | |
6823645d | 361 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 362 | pr_debug("nf_ct_h323: expect T.120 "); |
f587de0e PM |
363 | NF_CT_DUMP_TUPLE(&exp->tuple); |
364 | } else | |
365 | ret = -1; | |
366 | } | |
367 | ||
6823645d | 368 | nf_ct_expect_put(exp); |
f587de0e PM |
369 | |
370 | return ret; | |
371 | } | |
372 | ||
373 | /****************************************************************************/ | |
3db05fea | 374 | static int process_h245_channel(struct sk_buff *skb, |
f587de0e PM |
375 | struct nf_conn *ct, |
376 | enum ip_conntrack_info ctinfo, | |
377 | unsigned char **data, int dataoff, | |
378 | H2250LogicalChannelParameters *channel) | |
379 | { | |
380 | int ret; | |
381 | ||
382 | if (channel->options & eH2250LogicalChannelParameters_mediaChannel) { | |
383 | /* RTP */ | |
3db05fea | 384 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
385 | &channel->mediaChannel); |
386 | if (ret < 0) | |
387 | return -1; | |
388 | } | |
389 | ||
390 | if (channel-> | |
391 | options & eH2250LogicalChannelParameters_mediaControlChannel) { | |
392 | /* RTCP */ | |
3db05fea | 393 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
394 | &channel->mediaControlChannel); |
395 | if (ret < 0) | |
396 | return -1; | |
397 | } | |
398 | ||
399 | return 0; | |
400 | } | |
401 | ||
402 | /****************************************************************************/ | |
3db05fea | 403 | static int process_olc(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
404 | enum ip_conntrack_info ctinfo, |
405 | unsigned char **data, int dataoff, | |
406 | OpenLogicalChannel *olc) | |
407 | { | |
408 | int ret; | |
409 | ||
0d53778e | 410 | pr_debug("nf_ct_h323: OpenLogicalChannel\n"); |
f587de0e PM |
411 | |
412 | if (olc->forwardLogicalChannelParameters.multiplexParameters.choice == | |
413 | eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters) | |
414 | { | |
3db05fea | 415 | ret = process_h245_channel(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
416 | &olc-> |
417 | forwardLogicalChannelParameters. | |
418 | multiplexParameters. | |
419 | h2250LogicalChannelParameters); | |
420 | if (ret < 0) | |
421 | return -1; | |
422 | } | |
423 | ||
424 | if ((olc->options & | |
425 | eOpenLogicalChannel_reverseLogicalChannelParameters) && | |
426 | (olc->reverseLogicalChannelParameters.options & | |
427 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters) | |
428 | && (olc->reverseLogicalChannelParameters.multiplexParameters. | |
429 | choice == | |
430 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) | |
431 | { | |
432 | ret = | |
3db05fea | 433 | process_h245_channel(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
434 | &olc-> |
435 | reverseLogicalChannelParameters. | |
436 | multiplexParameters. | |
437 | h2250LogicalChannelParameters); | |
438 | if (ret < 0) | |
439 | return -1; | |
440 | } | |
441 | ||
442 | if ((olc->options & eOpenLogicalChannel_separateStack) && | |
443 | olc->forwardLogicalChannelParameters.dataType.choice == | |
444 | eDataType_data && | |
445 | olc->forwardLogicalChannelParameters.dataType.data.application. | |
446 | choice == eDataApplicationCapability_application_t120 && | |
447 | olc->forwardLogicalChannelParameters.dataType.data.application. | |
448 | t120.choice == eDataProtocolCapability_separateLANStack && | |
449 | olc->separateStack.networkAddress.choice == | |
450 | eNetworkAccessParameters_networkAddress_localAreaAddress) { | |
3db05fea | 451 | ret = expect_t120(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
452 | &olc->separateStack.networkAddress. |
453 | localAreaAddress); | |
454 | if (ret < 0) | |
455 | return -1; | |
456 | } | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
461 | /****************************************************************************/ | |
3db05fea | 462 | static int process_olca(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
463 | enum ip_conntrack_info ctinfo, |
464 | unsigned char **data, int dataoff, | |
465 | OpenLogicalChannelAck *olca) | |
466 | { | |
467 | H2250LogicalChannelAckParameters *ack; | |
468 | int ret; | |
469 | ||
0d53778e | 470 | pr_debug("nf_ct_h323: OpenLogicalChannelAck\n"); |
f587de0e PM |
471 | |
472 | if ((olca->options & | |
473 | eOpenLogicalChannelAck_reverseLogicalChannelParameters) && | |
474 | (olca->reverseLogicalChannelParameters.options & | |
475 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters) | |
476 | && (olca->reverseLogicalChannelParameters.multiplexParameters. | |
477 | choice == | |
478 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) | |
479 | { | |
3db05fea | 480 | ret = process_h245_channel(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
481 | &olca-> |
482 | reverseLogicalChannelParameters. | |
483 | multiplexParameters. | |
484 | h2250LogicalChannelParameters); | |
485 | if (ret < 0) | |
486 | return -1; | |
487 | } | |
488 | ||
489 | if ((olca->options & | |
490 | eOpenLogicalChannelAck_forwardMultiplexAckParameters) && | |
491 | (olca->forwardMultiplexAckParameters.choice == | |
492 | eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters)) | |
493 | { | |
494 | ack = &olca->forwardMultiplexAckParameters. | |
495 | h2250LogicalChannelAckParameters; | |
496 | if (ack->options & | |
497 | eH2250LogicalChannelAckParameters_mediaChannel) { | |
498 | /* RTP */ | |
3db05fea | 499 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
500 | &ack->mediaChannel); |
501 | if (ret < 0) | |
502 | return -1; | |
503 | } | |
504 | ||
505 | if (ack->options & | |
506 | eH2250LogicalChannelAckParameters_mediaControlChannel) { | |
507 | /* RTCP */ | |
3db05fea | 508 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
509 | &ack->mediaControlChannel); |
510 | if (ret < 0) | |
511 | return -1; | |
512 | } | |
513 | } | |
514 | ||
f8f1c08e JMZ |
515 | if ((olca->options & eOpenLogicalChannelAck_separateStack) && |
516 | olca->separateStack.networkAddress.choice == | |
517 | eNetworkAccessParameters_networkAddress_localAreaAddress) { | |
3db05fea | 518 | ret = expect_t120(skb, ct, ctinfo, data, dataoff, |
f8f1c08e JMZ |
519 | &olca->separateStack.networkAddress. |
520 | localAreaAddress); | |
521 | if (ret < 0) | |
522 | return -1; | |
523 | } | |
524 | ||
f587de0e PM |
525 | return 0; |
526 | } | |
527 | ||
528 | /****************************************************************************/ | |
3db05fea | 529 | static int process_h245(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
530 | enum ip_conntrack_info ctinfo, |
531 | unsigned char **data, int dataoff, | |
532 | MultimediaSystemControlMessage *mscm) | |
533 | { | |
534 | switch (mscm->choice) { | |
535 | case eMultimediaSystemControlMessage_request: | |
536 | if (mscm->request.choice == | |
537 | eRequestMessage_openLogicalChannel) { | |
3db05fea | 538 | return process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
539 | &mscm->request.openLogicalChannel); |
540 | } | |
0d53778e PM |
541 | pr_debug("nf_ct_h323: H.245 Request %d\n", |
542 | mscm->request.choice); | |
f587de0e PM |
543 | break; |
544 | case eMultimediaSystemControlMessage_response: | |
545 | if (mscm->response.choice == | |
546 | eResponseMessage_openLogicalChannelAck) { | |
3db05fea | 547 | return process_olca(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
548 | &mscm->response. |
549 | openLogicalChannelAck); | |
550 | } | |
0d53778e PM |
551 | pr_debug("nf_ct_h323: H.245 Response %d\n", |
552 | mscm->response.choice); | |
f587de0e PM |
553 | break; |
554 | default: | |
0d53778e | 555 | pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice); |
f587de0e PM |
556 | break; |
557 | } | |
558 | ||
559 | return 0; | |
560 | } | |
561 | ||
562 | /****************************************************************************/ | |
3db05fea | 563 | static int h245_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
564 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
565 | { | |
566 | static MultimediaSystemControlMessage mscm; | |
567 | unsigned char *data = NULL; | |
568 | int datalen; | |
569 | int dataoff; | |
570 | int ret; | |
571 | ||
572 | /* Until there's been traffic both ways, don't look in packets. */ | |
573 | if (ctinfo != IP_CT_ESTABLISHED && | |
574 | ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) { | |
575 | return NF_ACCEPT; | |
576 | } | |
3db05fea | 577 | pr_debug("nf_ct_h245: skblen = %u\n", skb->len); |
f587de0e PM |
578 | |
579 | spin_lock_bh(&nf_h323_lock); | |
580 | ||
581 | /* Process each TPKT */ | |
3db05fea | 582 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
f587de0e | 583 | &data, &datalen, &dataoff)) { |
0d53778e | 584 | pr_debug("nf_ct_h245: TPKT len=%d ", datalen); |
f587de0e PM |
585 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
586 | ||
587 | /* Decode H.245 signal */ | |
588 | ret = DecodeMultimediaSystemControlMessage(data, datalen, | |
589 | &mscm); | |
590 | if (ret < 0) { | |
0d53778e PM |
591 | pr_debug("nf_ct_h245: decoding error: %s\n", |
592 | ret == H323_ERROR_BOUND ? | |
593 | "out of bound" : "out of range"); | |
f587de0e PM |
594 | /* We don't drop when decoding error */ |
595 | break; | |
596 | } | |
597 | ||
598 | /* Process H.245 signal */ | |
3db05fea | 599 | if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0) |
f587de0e PM |
600 | goto drop; |
601 | } | |
602 | ||
603 | spin_unlock_bh(&nf_h323_lock); | |
604 | return NF_ACCEPT; | |
605 | ||
606 | drop: | |
607 | spin_unlock_bh(&nf_h323_lock); | |
608 | if (net_ratelimit()) | |
609 | printk("nf_ct_h245: packet dropped\n"); | |
610 | return NF_DROP; | |
611 | } | |
612 | ||
613 | /****************************************************************************/ | |
614 | static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { | |
615 | .name = "H.245", | |
616 | .me = THIS_MODULE, | |
617 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */, | |
618 | .timeout = 240, | |
619 | .tuple.dst.protonum = IPPROTO_UDP, | |
f587de0e PM |
620 | .help = h245_help |
621 | }; | |
622 | ||
623 | /****************************************************************************/ | |
624 | int get_h225_addr(struct nf_conn *ct, unsigned char *data, | |
625 | TransportAddress *taddr, | |
626 | union nf_conntrack_address *addr, __be16 *port) | |
627 | { | |
628 | unsigned char *p; | |
629 | int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
630 | int len; | |
631 | ||
632 | switch (taddr->choice) { | |
633 | case eTransportAddress_ipAddress: | |
634 | if (family != AF_INET) | |
635 | return 0; | |
636 | p = data + taddr->ipAddress.ip; | |
637 | len = 4; | |
638 | break; | |
639 | case eTransportAddress_ip6Address: | |
640 | if (family != AF_INET6) | |
641 | return 0; | |
bb807245 | 642 | p = data + taddr->ip6Address.ip; |
f587de0e PM |
643 | len = 16; |
644 | break; | |
645 | default: | |
646 | return 0; | |
647 | } | |
648 | ||
649 | memcpy(addr, p, len); | |
650 | memset((void *)addr + len, 0, sizeof(*addr) - len); | |
651 | memcpy(port, p + len, sizeof(__be16)); | |
652 | ||
653 | return 1; | |
654 | } | |
655 | ||
656 | /****************************************************************************/ | |
3db05fea | 657 | static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
658 | enum ip_conntrack_info ctinfo, |
659 | unsigned char **data, int dataoff, | |
660 | TransportAddress *taddr) | |
661 | { | |
662 | int dir = CTINFO2DIR(ctinfo); | |
663 | int ret = 0; | |
664 | __be16 port; | |
665 | union nf_conntrack_address addr; | |
666 | struct nf_conntrack_expect *exp; | |
667 | typeof(nat_h245_hook) nat_h245; | |
668 | ||
669 | /* Read h245Address */ | |
670 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || | |
671 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
672 | port == 0) | |
673 | return 0; | |
674 | ||
675 | /* Create expect for h245 connection */ | |
6823645d | 676 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 677 | return -1; |
6823645d PM |
678 | nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
679 | &ct->tuplehash[!dir].tuple.src.u3, | |
680 | &ct->tuplehash[!dir].tuple.dst.u3, | |
681 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
682 | exp->helper = &nf_conntrack_helper_h245; |
683 | ||
684 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
685 | &ct->tuplehash[!dir].tuple.dst.u3, | |
686 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
687 | (nat_h245 = rcu_dereference(nat_h245_hook)) && | |
688 | ct->status & IPS_NAT_MASK) { | |
689 | /* NAT needed */ | |
3db05fea | 690 | ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr, |
f587de0e PM |
691 | port, exp); |
692 | } else { /* Conntrack only */ | |
6823645d | 693 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 694 | pr_debug("nf_ct_q931: expect H.245 "); |
f587de0e PM |
695 | NF_CT_DUMP_TUPLE(&exp->tuple); |
696 | } else | |
697 | ret = -1; | |
698 | } | |
699 | ||
6823645d | 700 | nf_ct_expect_put(exp); |
f587de0e PM |
701 | |
702 | return ret; | |
703 | } | |
704 | ||
705 | /* If the calling party is on the same side of the forward-to party, | |
706 | * we don't need to track the second call */ | |
707 | static int callforward_do_filter(union nf_conntrack_address *src, | |
708 | union nf_conntrack_address *dst, | |
709 | int family) | |
710 | { | |
1841a4c7 | 711 | struct nf_afinfo *afinfo; |
f587de0e PM |
712 | struct flowi fl1, fl2; |
713 | int ret = 0; | |
714 | ||
1841a4c7 PM |
715 | /* rcu_read_lock()ed by nf_hook_slow() */ |
716 | afinfo = nf_get_afinfo(family); | |
717 | if (!afinfo) | |
718 | return 0; | |
719 | ||
f587de0e PM |
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; | |
1841a4c7 PM |
729 | if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) { |
730 | if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) { | |
f587de0e PM |
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 | } | |
1841a4c7 PM |
740 | #if defined(CONFIG_NF_CONNTRACK_IPV6) || \ |
741 | defined(CONFIG_NF_CONNTRACK_IPV6_MODULE) | |
f587de0e PM |
742 | case AF_INET6: { |
743 | struct rt6_info *rt1, *rt2; | |
744 | ||
745 | memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst)); | |
746 | memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst)); | |
1841a4c7 PM |
747 | if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) { |
748 | if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) { | |
f587de0e | 749 | if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway, |
601e68e1 | 750 | sizeof(rt1->rt6i_gateway)) && |
f587de0e PM |
751 | rt1->u.dst.dev == rt2->u.dst.dev) |
752 | ret = 1; | |
753 | dst_release(&rt2->u.dst); | |
754 | } | |
755 | dst_release(&rt1->u.dst); | |
756 | } | |
757 | break; | |
758 | } | |
759 | #endif | |
760 | } | |
761 | return ret; | |
762 | ||
763 | } | |
764 | ||
765 | /****************************************************************************/ | |
3db05fea | 766 | static int expect_callforwarding(struct sk_buff *skb, |
f587de0e PM |
767 | struct nf_conn *ct, |
768 | enum ip_conntrack_info ctinfo, | |
769 | unsigned char **data, int dataoff, | |
770 | TransportAddress *taddr) | |
771 | { | |
772 | int dir = CTINFO2DIR(ctinfo); | |
773 | int ret = 0; | |
774 | __be16 port; | |
775 | union nf_conntrack_address addr; | |
776 | struct nf_conntrack_expect *exp; | |
777 | typeof(nat_callforwarding_hook) nat_callforwarding; | |
778 | ||
779 | /* Read alternativeAddress */ | |
780 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) | |
781 | return 0; | |
782 | ||
783 | /* If the calling party is on the same side of the forward-to party, | |
784 | * we don't need to track the second call */ | |
785 | if (callforward_filter && | |
786 | callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3, | |
601e68e1 | 787 | ct->tuplehash[!dir].tuple.src.l3num)) { |
0d53778e | 788 | pr_debug("nf_ct_q931: Call Forwarding not tracked\n"); |
f587de0e PM |
789 | return 0; |
790 | } | |
791 | ||
792 | /* Create expect for the second call leg */ | |
6823645d | 793 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 794 | return -1; |
6823645d PM |
795 | nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
796 | &ct->tuplehash[!dir].tuple.src.u3, &addr, | |
797 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
798 | exp->helper = nf_conntrack_helper_q931; |
799 | ||
800 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
801 | &ct->tuplehash[!dir].tuple.dst.u3, | |
802 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
803 | (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && | |
804 | ct->status & IPS_NAT_MASK) { | |
805 | /* Need NAT */ | |
3db05fea | 806 | ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
807 | taddr, port, exp); |
808 | } else { /* Conntrack only */ | |
6823645d | 809 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 810 | pr_debug("nf_ct_q931: expect Call Forwarding "); |
f587de0e PM |
811 | NF_CT_DUMP_TUPLE(&exp->tuple); |
812 | } else | |
813 | ret = -1; | |
814 | } | |
815 | ||
6823645d | 816 | nf_ct_expect_put(exp); |
f587de0e PM |
817 | |
818 | return ret; | |
819 | } | |
820 | ||
821 | /****************************************************************************/ | |
3db05fea | 822 | static int process_setup(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
823 | enum ip_conntrack_info ctinfo, |
824 | unsigned char **data, int dataoff, | |
825 | Setup_UUIE *setup) | |
826 | { | |
827 | int dir = CTINFO2DIR(ctinfo); | |
828 | int ret; | |
829 | int i; | |
830 | __be16 port; | |
831 | union nf_conntrack_address addr; | |
832 | typeof(set_h225_addr_hook) set_h225_addr; | |
833 | ||
0d53778e | 834 | pr_debug("nf_ct_q931: Setup\n"); |
f587de0e PM |
835 | |
836 | if (setup->options & eSetup_UUIE_h245Address) { | |
3db05fea | 837 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
838 | &setup->h245Address); |
839 | if (ret < 0) | |
840 | return -1; | |
841 | } | |
842 | ||
843 | set_h225_addr = rcu_dereference(set_h225_addr_hook); | |
844 | if ((setup->options & eSetup_UUIE_destCallSignalAddress) && | |
845 | (set_h225_addr) && ct->status && IPS_NAT_MASK && | |
846 | get_h225_addr(ct, *data, &setup->destCallSignalAddress, | |
601e68e1 | 847 | &addr, &port) && |
f587de0e | 848 | memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { |
0d53778e PM |
849 | pr_debug("nf_ct_q931: set destCallSignalAddress " |
850 | NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n", | |
851 | NIP6(*(struct in6_addr *)&addr), ntohs(port), | |
852 | NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.src.u3), | |
853 | ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port)); | |
3db05fea | 854 | ret = set_h225_addr(skb, data, dataoff, |
f587de0e PM |
855 | &setup->destCallSignalAddress, |
856 | &ct->tuplehash[!dir].tuple.src.u3, | |
857 | ct->tuplehash[!dir].tuple.src.u.tcp.port); | |
858 | if (ret < 0) | |
859 | return -1; | |
860 | } | |
861 | ||
862 | if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && | |
863 | (set_h225_addr) && ct->status & IPS_NAT_MASK && | |
864 | get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, | |
601e68e1 | 865 | &addr, &port) && |
f587de0e | 866 | memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { |
0d53778e PM |
867 | pr_debug("nf_ct_q931: set sourceCallSignalAddress " |
868 | NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n", | |
869 | NIP6(*(struct in6_addr *)&addr), ntohs(port), | |
870 | NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.dst.u3), | |
871 | ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); | |
3db05fea | 872 | ret = set_h225_addr(skb, data, dataoff, |
f587de0e PM |
873 | &setup->sourceCallSignalAddress, |
874 | &ct->tuplehash[!dir].tuple.dst.u3, | |
875 | ct->tuplehash[!dir].tuple.dst.u.tcp.port); | |
876 | if (ret < 0) | |
877 | return -1; | |
878 | } | |
879 | ||
880 | if (setup->options & eSetup_UUIE_fastStart) { | |
881 | for (i = 0; i < setup->fastStart.count; i++) { | |
3db05fea | 882 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
883 | &setup->fastStart.item[i]); |
884 | if (ret < 0) | |
885 | return -1; | |
886 | } | |
887 | } | |
888 | ||
889 | return 0; | |
890 | } | |
891 | ||
892 | /****************************************************************************/ | |
3db05fea | 893 | static int process_callproceeding(struct sk_buff *skb, |
f587de0e PM |
894 | struct nf_conn *ct, |
895 | enum ip_conntrack_info ctinfo, | |
896 | unsigned char **data, int dataoff, | |
897 | CallProceeding_UUIE *callproc) | |
898 | { | |
899 | int ret; | |
900 | int i; | |
901 | ||
0d53778e | 902 | pr_debug("nf_ct_q931: CallProceeding\n"); |
f587de0e PM |
903 | |
904 | if (callproc->options & eCallProceeding_UUIE_h245Address) { | |
3db05fea | 905 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
906 | &callproc->h245Address); |
907 | if (ret < 0) | |
908 | return -1; | |
909 | } | |
910 | ||
911 | if (callproc->options & eCallProceeding_UUIE_fastStart) { | |
912 | for (i = 0; i < callproc->fastStart.count; i++) { | |
3db05fea | 913 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
914 | &callproc->fastStart.item[i]); |
915 | if (ret < 0) | |
916 | return -1; | |
917 | } | |
918 | } | |
919 | ||
920 | return 0; | |
921 | } | |
922 | ||
923 | /****************************************************************************/ | |
3db05fea | 924 | static int process_connect(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
925 | enum ip_conntrack_info ctinfo, |
926 | unsigned char **data, int dataoff, | |
927 | Connect_UUIE *connect) | |
928 | { | |
929 | int ret; | |
930 | int i; | |
931 | ||
0d53778e | 932 | pr_debug("nf_ct_q931: Connect\n"); |
f587de0e PM |
933 | |
934 | if (connect->options & eConnect_UUIE_h245Address) { | |
3db05fea | 935 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
936 | &connect->h245Address); |
937 | if (ret < 0) | |
938 | return -1; | |
939 | } | |
940 | ||
941 | if (connect->options & eConnect_UUIE_fastStart) { | |
942 | for (i = 0; i < connect->fastStart.count; i++) { | |
3db05fea | 943 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
944 | &connect->fastStart.item[i]); |
945 | if (ret < 0) | |
946 | return -1; | |
947 | } | |
948 | } | |
949 | ||
950 | return 0; | |
951 | } | |
952 | ||
953 | /****************************************************************************/ | |
3db05fea | 954 | static int process_alerting(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
955 | enum ip_conntrack_info ctinfo, |
956 | unsigned char **data, int dataoff, | |
957 | Alerting_UUIE *alert) | |
958 | { | |
959 | int ret; | |
960 | int i; | |
961 | ||
0d53778e | 962 | pr_debug("nf_ct_q931: Alerting\n"); |
f587de0e PM |
963 | |
964 | if (alert->options & eAlerting_UUIE_h245Address) { | |
3db05fea | 965 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
966 | &alert->h245Address); |
967 | if (ret < 0) | |
968 | return -1; | |
969 | } | |
970 | ||
971 | if (alert->options & eAlerting_UUIE_fastStart) { | |
972 | for (i = 0; i < alert->fastStart.count; i++) { | |
3db05fea | 973 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
974 | &alert->fastStart.item[i]); |
975 | if (ret < 0) | |
976 | return -1; | |
977 | } | |
978 | } | |
979 | ||
980 | return 0; | |
981 | } | |
982 | ||
f587de0e | 983 | /****************************************************************************/ |
3db05fea | 984 | static int process_facility(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
985 | enum ip_conntrack_info ctinfo, |
986 | unsigned char **data, int dataoff, | |
987 | Facility_UUIE *facility) | |
988 | { | |
989 | int ret; | |
990 | int i; | |
991 | ||
0d53778e | 992 | pr_debug("nf_ct_q931: Facility\n"); |
f587de0e PM |
993 | |
994 | if (facility->reason.choice == eFacilityReason_callForwarded) { | |
995 | if (facility->options & eFacility_UUIE_alternativeAddress) | |
3db05fea | 996 | return expect_callforwarding(skb, ct, ctinfo, data, |
f587de0e PM |
997 | dataoff, |
998 | &facility-> | |
999 | alternativeAddress); | |
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | if (facility->options & eFacility_UUIE_h245Address) { | |
3db05fea | 1004 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1005 | &facility->h245Address); |
1006 | if (ret < 0) | |
1007 | return -1; | |
1008 | } | |
1009 | ||
1010 | if (facility->options & eFacility_UUIE_fastStart) { | |
1011 | for (i = 0; i < facility->fastStart.count; i++) { | |
3db05fea | 1012 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1013 | &facility->fastStart.item[i]); |
1014 | if (ret < 0) | |
1015 | return -1; | |
1016 | } | |
1017 | } | |
1018 | ||
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | /****************************************************************************/ | |
3db05fea | 1023 | static int process_progress(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1024 | enum ip_conntrack_info ctinfo, |
1025 | unsigned char **data, int dataoff, | |
1026 | Progress_UUIE *progress) | |
1027 | { | |
1028 | int ret; | |
1029 | int i; | |
1030 | ||
0d53778e | 1031 | pr_debug("nf_ct_q931: Progress\n"); |
f587de0e PM |
1032 | |
1033 | if (progress->options & eProgress_UUIE_h245Address) { | |
3db05fea | 1034 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1035 | &progress->h245Address); |
1036 | if (ret < 0) | |
1037 | return -1; | |
1038 | } | |
1039 | ||
1040 | if (progress->options & eProgress_UUIE_fastStart) { | |
1041 | for (i = 0; i < progress->fastStart.count; i++) { | |
3db05fea | 1042 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1043 | &progress->fastStart.item[i]); |
1044 | if (ret < 0) | |
1045 | return -1; | |
1046 | } | |
1047 | } | |
1048 | ||
1049 | return 0; | |
1050 | } | |
1051 | ||
1052 | /****************************************************************************/ | |
3db05fea | 1053 | static int process_q931(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1054 | enum ip_conntrack_info ctinfo, |
1055 | unsigned char **data, int dataoff, Q931 *q931) | |
1056 | { | |
1057 | H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; | |
1058 | int i; | |
1059 | int ret = 0; | |
1060 | ||
1061 | switch (pdu->h323_message_body.choice) { | |
1062 | case eH323_UU_PDU_h323_message_body_setup: | |
3db05fea | 1063 | ret = process_setup(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1064 | &pdu->h323_message_body.setup); |
1065 | break; | |
1066 | case eH323_UU_PDU_h323_message_body_callProceeding: | |
3db05fea | 1067 | ret = process_callproceeding(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1068 | &pdu->h323_message_body. |
1069 | callProceeding); | |
1070 | break; | |
1071 | case eH323_UU_PDU_h323_message_body_connect: | |
3db05fea | 1072 | ret = process_connect(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1073 | &pdu->h323_message_body.connect); |
1074 | break; | |
1075 | case eH323_UU_PDU_h323_message_body_alerting: | |
3db05fea | 1076 | ret = process_alerting(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1077 | &pdu->h323_message_body.alerting); |
1078 | break; | |
f587de0e | 1079 | case eH323_UU_PDU_h323_message_body_facility: |
3db05fea | 1080 | ret = process_facility(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1081 | &pdu->h323_message_body.facility); |
1082 | break; | |
1083 | case eH323_UU_PDU_h323_message_body_progress: | |
3db05fea | 1084 | ret = process_progress(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1085 | &pdu->h323_message_body.progress); |
1086 | break; | |
1087 | default: | |
0d53778e PM |
1088 | pr_debug("nf_ct_q931: Q.931 signal %d\n", |
1089 | pdu->h323_message_body.choice); | |
f587de0e PM |
1090 | break; |
1091 | } | |
1092 | ||
1093 | if (ret < 0) | |
1094 | return -1; | |
1095 | ||
1096 | if (pdu->options & eH323_UU_PDU_h245Control) { | |
1097 | for (i = 0; i < pdu->h245Control.count; i++) { | |
3db05fea | 1098 | ret = process_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1099 | &pdu->h245Control.item[i]); |
1100 | if (ret < 0) | |
1101 | return -1; | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | return 0; | |
1106 | } | |
1107 | ||
1108 | /****************************************************************************/ | |
3db05fea | 1109 | static int q931_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1110 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
1111 | { | |
1112 | static Q931 q931; | |
1113 | unsigned char *data = NULL; | |
1114 | int datalen; | |
1115 | int dataoff; | |
1116 | int ret; | |
1117 | ||
1118 | /* Until there's been traffic both ways, don't look in packets. */ | |
1119 | if (ctinfo != IP_CT_ESTABLISHED && | |
1120 | ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) { | |
1121 | return NF_ACCEPT; | |
1122 | } | |
3db05fea | 1123 | pr_debug("nf_ct_q931: skblen = %u\n", skb->len); |
f587de0e PM |
1124 | |
1125 | spin_lock_bh(&nf_h323_lock); | |
1126 | ||
1127 | /* Process each TPKT */ | |
3db05fea | 1128 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
f587de0e | 1129 | &data, &datalen, &dataoff)) { |
0d53778e | 1130 | pr_debug("nf_ct_q931: TPKT len=%d ", datalen); |
f587de0e PM |
1131 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
1132 | ||
1133 | /* Decode Q.931 signal */ | |
1134 | ret = DecodeQ931(data, datalen, &q931); | |
1135 | if (ret < 0) { | |
0d53778e PM |
1136 | pr_debug("nf_ct_q931: decoding error: %s\n", |
1137 | ret == H323_ERROR_BOUND ? | |
1138 | "out of bound" : "out of range"); | |
f587de0e PM |
1139 | /* We don't drop when decoding error */ |
1140 | break; | |
1141 | } | |
1142 | ||
1143 | /* Process Q.931 signal */ | |
3db05fea | 1144 | if (process_q931(skb, ct, ctinfo, &data, dataoff, &q931) < 0) |
f587de0e PM |
1145 | goto drop; |
1146 | } | |
1147 | ||
1148 | spin_unlock_bh(&nf_h323_lock); | |
1149 | return NF_ACCEPT; | |
1150 | ||
1151 | drop: | |
1152 | spin_unlock_bh(&nf_h323_lock); | |
1153 | if (net_ratelimit()) | |
1154 | printk("nf_ct_q931: packet dropped\n"); | |
1155 | return NF_DROP; | |
1156 | } | |
1157 | ||
1158 | /****************************************************************************/ | |
1159 | static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { | |
1160 | { | |
1161 | .name = "Q.931", | |
1162 | .me = THIS_MODULE, | |
1163 | /* T.120 and H.245 */ | |
1164 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, | |
1165 | .timeout = 240, | |
1166 | .tuple.src.l3num = AF_INET, | |
1167 | .tuple.src.u.tcp.port = __constant_htons(Q931_PORT), | |
1168 | .tuple.dst.protonum = IPPROTO_TCP, | |
f587de0e PM |
1169 | .help = q931_help |
1170 | }, | |
1171 | { | |
1172 | .name = "Q.931", | |
1173 | .me = THIS_MODULE, | |
1174 | /* T.120 and H.245 */ | |
1175 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, | |
1176 | .timeout = 240, | |
1177 | .tuple.src.l3num = AF_INET6, | |
1178 | .tuple.src.u.tcp.port = __constant_htons(Q931_PORT), | |
1179 | .tuple.dst.protonum = IPPROTO_TCP, | |
f587de0e PM |
1180 | .help = q931_help |
1181 | }, | |
1182 | }; | |
1183 | ||
1184 | /****************************************************************************/ | |
3db05fea | 1185 | static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1186 | int *datalen) |
1187 | { | |
1188 | struct udphdr _uh, *uh; | |
1189 | int dataoff; | |
1190 | ||
3db05fea | 1191 | uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh); |
f587de0e PM |
1192 | if (uh == NULL) |
1193 | return NULL; | |
1194 | dataoff = protoff + sizeof(_uh); | |
3db05fea | 1195 | if (dataoff >= skb->len) |
f587de0e | 1196 | return NULL; |
3db05fea HX |
1197 | *datalen = skb->len - dataoff; |
1198 | return skb_header_pointer(skb, dataoff, *datalen, h323_buffer); | |
f587de0e PM |
1199 | } |
1200 | ||
1201 | /****************************************************************************/ | |
1202 | static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, | |
1203 | union nf_conntrack_address *addr, | |
1204 | __be16 port) | |
1205 | { | |
1206 | struct nf_conntrack_expect *exp; | |
1207 | struct nf_conntrack_tuple tuple; | |
1208 | ||
1209 | memset(&tuple.src.u3, 0, sizeof(tuple.src.u3)); | |
1210 | tuple.src.u.tcp.port = 0; | |
1211 | memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3)); | |
1212 | tuple.dst.u.tcp.port = port; | |
1213 | tuple.dst.protonum = IPPROTO_TCP; | |
1214 | ||
6823645d | 1215 | exp = __nf_ct_expect_find(&tuple); |
f587de0e PM |
1216 | if (exp && exp->master == ct) |
1217 | return exp; | |
1218 | return NULL; | |
1219 | } | |
1220 | ||
1221 | /****************************************************************************/ | |
1222 | static int set_expect_timeout(struct nf_conntrack_expect *exp, | |
1223 | unsigned timeout) | |
1224 | { | |
1225 | if (!exp || !del_timer(&exp->timeout)) | |
1226 | return 0; | |
1227 | ||
1228 | exp->timeout.expires = jiffies + timeout * HZ; | |
1229 | add_timer(&exp->timeout); | |
1230 | ||
1231 | return 1; | |
1232 | } | |
1233 | ||
1234 | /****************************************************************************/ | |
3db05fea | 1235 | static int expect_q931(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1236 | enum ip_conntrack_info ctinfo, |
1237 | unsigned char **data, | |
1238 | TransportAddress *taddr, int count) | |
1239 | { | |
1240 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1241 | int dir = CTINFO2DIR(ctinfo); | |
1242 | int ret = 0; | |
1243 | int i; | |
1244 | __be16 port; | |
1245 | union nf_conntrack_address addr; | |
1246 | struct nf_conntrack_expect *exp; | |
1247 | typeof(nat_q931_hook) nat_q931; | |
1248 | ||
1249 | /* Look for the first related address */ | |
1250 | for (i = 0; i < count; i++) { | |
1251 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && | |
1252 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, | |
601e68e1 | 1253 | sizeof(addr)) == 0 && port != 0) |
f587de0e PM |
1254 | break; |
1255 | } | |
1256 | ||
1257 | if (i >= count) /* Not found */ | |
1258 | return 0; | |
1259 | ||
1260 | /* Create expect for Q.931 */ | |
6823645d | 1261 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1262 | return -1; |
6823645d PM |
1263 | nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
1264 | gkrouted_only ? /* only accept calls from GK? */ | |
1265 | &ct->tuplehash[!dir].tuple.src.u3 : NULL, | |
1266 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1267 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1268 | exp->helper = nf_conntrack_helper_q931; |
1269 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ | |
1270 | ||
1271 | nat_q931 = rcu_dereference(nat_q931_hook); | |
1272 | if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */ | |
3db05fea | 1273 | ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp); |
f587de0e | 1274 | } else { /* Conntrack only */ |
6823645d | 1275 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1276 | pr_debug("nf_ct_ras: expect Q.931 "); |
f587de0e PM |
1277 | NF_CT_DUMP_TUPLE(&exp->tuple); |
1278 | ||
1279 | /* Save port for looking up expect in processing RCF */ | |
1280 | info->sig_port[dir] = port; | |
1281 | } else | |
1282 | ret = -1; | |
1283 | } | |
1284 | ||
6823645d | 1285 | nf_ct_expect_put(exp); |
f587de0e PM |
1286 | |
1287 | return ret; | |
1288 | } | |
1289 | ||
1290 | /****************************************************************************/ | |
3db05fea | 1291 | static int process_grq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1292 | enum ip_conntrack_info ctinfo, |
1293 | unsigned char **data, GatekeeperRequest *grq) | |
1294 | { | |
1295 | typeof(set_ras_addr_hook) set_ras_addr; | |
1296 | ||
0d53778e | 1297 | pr_debug("nf_ct_ras: GRQ\n"); |
f587de0e PM |
1298 | |
1299 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1300 | if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */ | |
3db05fea | 1301 | return set_ras_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1302 | &grq->rasAddress, 1); |
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | /****************************************************************************/ | |
3db05fea | 1307 | static int process_gcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1308 | enum ip_conntrack_info ctinfo, |
1309 | unsigned char **data, GatekeeperConfirm *gcf) | |
1310 | { | |
1311 | int dir = CTINFO2DIR(ctinfo); | |
1312 | int ret = 0; | |
1313 | __be16 port; | |
1314 | union nf_conntrack_address addr; | |
1315 | struct nf_conntrack_expect *exp; | |
1316 | ||
0d53778e | 1317 | pr_debug("nf_ct_ras: GCF\n"); |
f587de0e PM |
1318 | |
1319 | if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) | |
1320 | return 0; | |
1321 | ||
1322 | /* Registration port is the same as discovery port */ | |
1323 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && | |
1324 | port == ct->tuplehash[dir].tuple.src.u.udp.port) | |
1325 | return 0; | |
1326 | ||
1327 | /* Avoid RAS expectation loops. A GCF is never expected. */ | |
1328 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) | |
1329 | return 0; | |
1330 | ||
1331 | /* Need new expect */ | |
6823645d | 1332 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1333 | return -1; |
6823645d PM |
1334 | nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
1335 | &ct->tuplehash[!dir].tuple.src.u3, &addr, | |
1336 | IPPROTO_UDP, NULL, &port); | |
f587de0e PM |
1337 | exp->helper = nf_conntrack_helper_ras; |
1338 | ||
6823645d | 1339 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1340 | pr_debug("nf_ct_ras: expect RAS "); |
f587de0e PM |
1341 | NF_CT_DUMP_TUPLE(&exp->tuple); |
1342 | } else | |
1343 | ret = -1; | |
1344 | ||
6823645d | 1345 | nf_ct_expect_put(exp); |
f587de0e PM |
1346 | |
1347 | return ret; | |
1348 | } | |
1349 | ||
1350 | /****************************************************************************/ | |
3db05fea | 1351 | static int process_rrq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1352 | enum ip_conntrack_info ctinfo, |
1353 | unsigned char **data, RegistrationRequest *rrq) | |
1354 | { | |
1355 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1356 | int ret; | |
1357 | typeof(set_ras_addr_hook) set_ras_addr; | |
1358 | ||
0d53778e | 1359 | pr_debug("nf_ct_ras: RRQ\n"); |
f587de0e | 1360 | |
3db05fea | 1361 | ret = expect_q931(skb, ct, ctinfo, data, |
f587de0e PM |
1362 | rrq->callSignalAddress.item, |
1363 | rrq->callSignalAddress.count); | |
1364 | if (ret < 0) | |
1365 | return -1; | |
1366 | ||
1367 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1368 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1369 | ret = set_ras_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1370 | rrq->rasAddress.item, |
1371 | rrq->rasAddress.count); | |
1372 | if (ret < 0) | |
1373 | return -1; | |
1374 | } | |
1375 | ||
1376 | if (rrq->options & eRegistrationRequest_timeToLive) { | |
0d53778e | 1377 | pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); |
f587de0e PM |
1378 | info->timeout = rrq->timeToLive; |
1379 | } else | |
1380 | info->timeout = default_rrq_ttl; | |
1381 | ||
1382 | return 0; | |
1383 | } | |
1384 | ||
1385 | /****************************************************************************/ | |
3db05fea | 1386 | static int process_rcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1387 | enum ip_conntrack_info ctinfo, |
1388 | unsigned char **data, RegistrationConfirm *rcf) | |
1389 | { | |
1390 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1391 | int dir = CTINFO2DIR(ctinfo); | |
1392 | int ret; | |
1393 | struct nf_conntrack_expect *exp; | |
1394 | typeof(set_sig_addr_hook) set_sig_addr; | |
1395 | ||
0d53778e | 1396 | pr_debug("nf_ct_ras: RCF\n"); |
f587de0e PM |
1397 | |
1398 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1399 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1400 | ret = set_sig_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1401 | rcf->callSignalAddress.item, |
1402 | rcf->callSignalAddress.count); | |
1403 | if (ret < 0) | |
1404 | return -1; | |
1405 | } | |
1406 | ||
1407 | if (rcf->options & eRegistrationConfirm_timeToLive) { | |
0d53778e | 1408 | pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); |
f587de0e PM |
1409 | info->timeout = rcf->timeToLive; |
1410 | } | |
1411 | ||
1412 | if (info->timeout > 0) { | |
0d53778e PM |
1413 | pr_debug("nf_ct_ras: set RAS connection timeout to " |
1414 | "%u seconds\n", info->timeout); | |
3db05fea | 1415 | nf_ct_refresh(ct, skb, info->timeout * HZ); |
f587de0e PM |
1416 | |
1417 | /* Set expect timeout */ | |
1418 | read_lock_bh(&nf_conntrack_lock); | |
1419 | exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, | |
1420 | info->sig_port[!dir]); | |
1421 | if (exp) { | |
0d53778e PM |
1422 | pr_debug("nf_ct_ras: set Q.931 expect " |
1423 | "timeout to %u seconds for", | |
1424 | info->timeout); | |
f587de0e PM |
1425 | NF_CT_DUMP_TUPLE(&exp->tuple); |
1426 | set_expect_timeout(exp, info->timeout); | |
1427 | } | |
1428 | read_unlock_bh(&nf_conntrack_lock); | |
1429 | } | |
1430 | ||
1431 | return 0; | |
1432 | } | |
1433 | ||
1434 | /****************************************************************************/ | |
3db05fea | 1435 | static int process_urq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1436 | enum ip_conntrack_info ctinfo, |
1437 | unsigned char **data, UnregistrationRequest *urq) | |
1438 | { | |
1439 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1440 | int dir = CTINFO2DIR(ctinfo); | |
1441 | int ret; | |
1442 | typeof(set_sig_addr_hook) set_sig_addr; | |
1443 | ||
0d53778e | 1444 | pr_debug("nf_ct_ras: URQ\n"); |
f587de0e PM |
1445 | |
1446 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1447 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1448 | ret = set_sig_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1449 | urq->callSignalAddress.item, |
1450 | urq->callSignalAddress.count); | |
1451 | if (ret < 0) | |
1452 | return -1; | |
1453 | } | |
1454 | ||
1455 | /* Clear old expect */ | |
1456 | nf_ct_remove_expectations(ct); | |
1457 | info->sig_port[dir] = 0; | |
1458 | info->sig_port[!dir] = 0; | |
1459 | ||
1460 | /* Give it 30 seconds for UCF or URJ */ | |
3db05fea | 1461 | nf_ct_refresh(ct, skb, 30 * HZ); |
f587de0e PM |
1462 | |
1463 | return 0; | |
1464 | } | |
1465 | ||
1466 | /****************************************************************************/ | |
3db05fea | 1467 | static int process_arq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1468 | enum ip_conntrack_info ctinfo, |
1469 | unsigned char **data, AdmissionRequest *arq) | |
1470 | { | |
1471 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1472 | int dir = CTINFO2DIR(ctinfo); | |
1473 | __be16 port; | |
1474 | union nf_conntrack_address addr; | |
1475 | typeof(set_h225_addr_hook) set_h225_addr; | |
1476 | ||
0d53778e | 1477 | pr_debug("nf_ct_ras: ARQ\n"); |
f587de0e PM |
1478 | |
1479 | set_h225_addr = rcu_dereference(set_h225_addr_hook); | |
1480 | if ((arq->options & eAdmissionRequest_destCallSignalAddress) && | |
1481 | get_h225_addr(ct, *data, &arq->destCallSignalAddress, | |
601e68e1 | 1482 | &addr, &port) && |
f587de0e PM |
1483 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
1484 | port == info->sig_port[dir] && | |
1485 | set_h225_addr && ct->status & IPS_NAT_MASK) { | |
1486 | /* Answering ARQ */ | |
3db05fea | 1487 | return set_h225_addr(skb, data, 0, |
f587de0e PM |
1488 | &arq->destCallSignalAddress, |
1489 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1490 | info->sig_port[!dir]); | |
1491 | } | |
1492 | ||
1493 | if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && | |
1494 | get_h225_addr(ct, *data, &arq->srcCallSignalAddress, | |
601e68e1 | 1495 | &addr, &port) && |
f587de0e PM |
1496 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
1497 | set_h225_addr && ct->status & IPS_NAT_MASK) { | |
1498 | /* Calling ARQ */ | |
3db05fea | 1499 | return set_h225_addr(skb, data, 0, |
f587de0e PM |
1500 | &arq->srcCallSignalAddress, |
1501 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1502 | port); | |
1503 | } | |
1504 | ||
1505 | return 0; | |
1506 | } | |
1507 | ||
1508 | /****************************************************************************/ | |
3db05fea | 1509 | static int process_acf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1510 | enum ip_conntrack_info ctinfo, |
1511 | unsigned char **data, AdmissionConfirm *acf) | |
1512 | { | |
1513 | int dir = CTINFO2DIR(ctinfo); | |
1514 | int ret = 0; | |
1515 | __be16 port; | |
1516 | union nf_conntrack_address addr; | |
1517 | struct nf_conntrack_expect *exp; | |
1518 | typeof(set_sig_addr_hook) set_sig_addr; | |
1519 | ||
0d53778e | 1520 | pr_debug("nf_ct_ras: ACF\n"); |
f587de0e PM |
1521 | |
1522 | if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, | |
1523 | &addr, &port)) | |
1524 | return 0; | |
1525 | ||
1526 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { | |
1527 | /* Answering ACF */ | |
1528 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1529 | if (set_sig_addr && ct->status & IPS_NAT_MASK) | |
3db05fea | 1530 | return set_sig_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1531 | &acf->destCallSignalAddress, 1); |
1532 | return 0; | |
1533 | } | |
1534 | ||
1535 | /* Need new expect */ | |
6823645d | 1536 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1537 | return -1; |
6823645d PM |
1538 | nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
1539 | &ct->tuplehash[!dir].tuple.src.u3, &addr, | |
1540 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1541 | exp->flags = NF_CT_EXPECT_PERMANENT; |
1542 | exp->helper = nf_conntrack_helper_q931; | |
1543 | ||
6823645d | 1544 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1545 | pr_debug("nf_ct_ras: expect Q.931 "); |
f587de0e PM |
1546 | NF_CT_DUMP_TUPLE(&exp->tuple); |
1547 | } else | |
1548 | ret = -1; | |
1549 | ||
6823645d | 1550 | nf_ct_expect_put(exp); |
f587de0e PM |
1551 | |
1552 | return ret; | |
1553 | } | |
1554 | ||
1555 | /****************************************************************************/ | |
3db05fea | 1556 | static int process_lrq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1557 | enum ip_conntrack_info ctinfo, |
1558 | unsigned char **data, LocationRequest *lrq) | |
1559 | { | |
1560 | typeof(set_ras_addr_hook) set_ras_addr; | |
1561 | ||
0d53778e | 1562 | pr_debug("nf_ct_ras: LRQ\n"); |
f587de0e PM |
1563 | |
1564 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1565 | if (set_ras_addr && ct->status & IPS_NAT_MASK) | |
3db05fea | 1566 | return set_ras_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1567 | &lrq->replyAddress, 1); |
1568 | return 0; | |
1569 | } | |
1570 | ||
1571 | /****************************************************************************/ | |
3db05fea | 1572 | static int process_lcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1573 | enum ip_conntrack_info ctinfo, |
1574 | unsigned char **data, LocationConfirm *lcf) | |
1575 | { | |
1576 | int dir = CTINFO2DIR(ctinfo); | |
1577 | int ret = 0; | |
1578 | __be16 port; | |
1579 | union nf_conntrack_address addr; | |
1580 | struct nf_conntrack_expect *exp; | |
1581 | ||
0d53778e | 1582 | pr_debug("nf_ct_ras: LCF\n"); |
f587de0e PM |
1583 | |
1584 | if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, | |
1585 | &addr, &port)) | |
1586 | return 0; | |
1587 | ||
1588 | /* Need new expect for call signal */ | |
6823645d | 1589 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1590 | return -1; |
6823645d PM |
1591 | nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
1592 | &ct->tuplehash[!dir].tuple.src.u3, &addr, | |
1593 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1594 | exp->flags = NF_CT_EXPECT_PERMANENT; |
1595 | exp->helper = nf_conntrack_helper_q931; | |
1596 | ||
6823645d | 1597 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1598 | pr_debug("nf_ct_ras: expect Q.931 "); |
f587de0e PM |
1599 | NF_CT_DUMP_TUPLE(&exp->tuple); |
1600 | } else | |
1601 | ret = -1; | |
1602 | ||
6823645d | 1603 | nf_ct_expect_put(exp); |
f587de0e PM |
1604 | |
1605 | /* Ignore rasAddress */ | |
1606 | ||
1607 | return ret; | |
1608 | } | |
1609 | ||
1610 | /****************************************************************************/ | |
3db05fea | 1611 | static int process_irr(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1612 | enum ip_conntrack_info ctinfo, |
1613 | unsigned char **data, InfoRequestResponse *irr) | |
1614 | { | |
1615 | int ret; | |
1616 | typeof(set_ras_addr_hook) set_ras_addr; | |
1617 | typeof(set_sig_addr_hook) set_sig_addr; | |
1618 | ||
0d53778e | 1619 | pr_debug("nf_ct_ras: IRR\n"); |
f587de0e PM |
1620 | |
1621 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1622 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1623 | ret = set_ras_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1624 | &irr->rasAddress, 1); |
1625 | if (ret < 0) | |
1626 | return -1; | |
1627 | } | |
1628 | ||
1629 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1630 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1631 | ret = set_sig_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1632 | irr->callSignalAddress.item, |
1633 | irr->callSignalAddress.count); | |
1634 | if (ret < 0) | |
1635 | return -1; | |
1636 | } | |
1637 | ||
1638 | return 0; | |
1639 | } | |
1640 | ||
1641 | /****************************************************************************/ | |
3db05fea | 1642 | static int process_ras(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1643 | enum ip_conntrack_info ctinfo, |
1644 | unsigned char **data, RasMessage *ras) | |
1645 | { | |
1646 | switch (ras->choice) { | |
1647 | case eRasMessage_gatekeeperRequest: | |
3db05fea | 1648 | return process_grq(skb, ct, ctinfo, data, |
f587de0e PM |
1649 | &ras->gatekeeperRequest); |
1650 | case eRasMessage_gatekeeperConfirm: | |
3db05fea | 1651 | return process_gcf(skb, ct, ctinfo, data, |
f587de0e PM |
1652 | &ras->gatekeeperConfirm); |
1653 | case eRasMessage_registrationRequest: | |
3db05fea | 1654 | return process_rrq(skb, ct, ctinfo, data, |
f587de0e PM |
1655 | &ras->registrationRequest); |
1656 | case eRasMessage_registrationConfirm: | |
3db05fea | 1657 | return process_rcf(skb, ct, ctinfo, data, |
f587de0e PM |
1658 | &ras->registrationConfirm); |
1659 | case eRasMessage_unregistrationRequest: | |
3db05fea | 1660 | return process_urq(skb, ct, ctinfo, data, |
f587de0e PM |
1661 | &ras->unregistrationRequest); |
1662 | case eRasMessage_admissionRequest: | |
3db05fea | 1663 | return process_arq(skb, ct, ctinfo, data, |
f587de0e PM |
1664 | &ras->admissionRequest); |
1665 | case eRasMessage_admissionConfirm: | |
3db05fea | 1666 | return process_acf(skb, ct, ctinfo, data, |
f587de0e PM |
1667 | &ras->admissionConfirm); |
1668 | case eRasMessage_locationRequest: | |
3db05fea | 1669 | return process_lrq(skb, ct, ctinfo, data, |
f587de0e PM |
1670 | &ras->locationRequest); |
1671 | case eRasMessage_locationConfirm: | |
3db05fea | 1672 | return process_lcf(skb, ct, ctinfo, data, |
f587de0e PM |
1673 | &ras->locationConfirm); |
1674 | case eRasMessage_infoRequestResponse: | |
3db05fea | 1675 | return process_irr(skb, ct, ctinfo, data, |
f587de0e PM |
1676 | &ras->infoRequestResponse); |
1677 | default: | |
0d53778e | 1678 | pr_debug("nf_ct_ras: RAS message %d\n", ras->choice); |
f587de0e PM |
1679 | break; |
1680 | } | |
1681 | ||
1682 | return 0; | |
1683 | } | |
1684 | ||
1685 | /****************************************************************************/ | |
3db05fea | 1686 | static int ras_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1687 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
1688 | { | |
1689 | static RasMessage ras; | |
1690 | unsigned char *data; | |
1691 | int datalen = 0; | |
1692 | int ret; | |
1693 | ||
3db05fea | 1694 | pr_debug("nf_ct_ras: skblen = %u\n", skb->len); |
f587de0e PM |
1695 | |
1696 | spin_lock_bh(&nf_h323_lock); | |
1697 | ||
1698 | /* Get UDP data */ | |
3db05fea | 1699 | data = get_udp_data(skb, protoff, &datalen); |
f587de0e PM |
1700 | if (data == NULL) |
1701 | goto accept; | |
0d53778e | 1702 | pr_debug("nf_ct_ras: RAS message len=%d ", datalen); |
f587de0e PM |
1703 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
1704 | ||
1705 | /* Decode RAS message */ | |
1706 | ret = DecodeRasMessage(data, datalen, &ras); | |
1707 | if (ret < 0) { | |
0d53778e PM |
1708 | pr_debug("nf_ct_ras: decoding error: %s\n", |
1709 | ret == H323_ERROR_BOUND ? | |
1710 | "out of bound" : "out of range"); | |
f587de0e PM |
1711 | goto accept; |
1712 | } | |
1713 | ||
1714 | /* Process RAS message */ | |
3db05fea | 1715 | if (process_ras(skb, ct, ctinfo, &data, &ras) < 0) |
f587de0e PM |
1716 | goto drop; |
1717 | ||
1718 | accept: | |
1719 | spin_unlock_bh(&nf_h323_lock); | |
1720 | return NF_ACCEPT; | |
1721 | ||
1722 | drop: | |
1723 | spin_unlock_bh(&nf_h323_lock); | |
1724 | if (net_ratelimit()) | |
1725 | printk("nf_ct_ras: packet dropped\n"); | |
1726 | return NF_DROP; | |
1727 | } | |
1728 | ||
1729 | /****************************************************************************/ | |
1730 | static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { | |
1731 | { | |
1732 | .name = "RAS", | |
1733 | .me = THIS_MODULE, | |
1734 | .max_expected = 32, | |
1735 | .timeout = 240, | |
1736 | .tuple.src.l3num = AF_INET, | |
1737 | .tuple.src.u.udp.port = __constant_htons(RAS_PORT), | |
1738 | .tuple.dst.protonum = IPPROTO_UDP, | |
f587de0e PM |
1739 | .help = ras_help, |
1740 | }, | |
1741 | { | |
1742 | .name = "RAS", | |
1743 | .me = THIS_MODULE, | |
1744 | .max_expected = 32, | |
1745 | .timeout = 240, | |
1746 | .tuple.src.l3num = AF_INET6, | |
1747 | .tuple.src.u.udp.port = __constant_htons(RAS_PORT), | |
1748 | .tuple.dst.protonum = IPPROTO_UDP, | |
f587de0e PM |
1749 | .help = ras_help, |
1750 | }, | |
1751 | }; | |
1752 | ||
1753 | /****************************************************************************/ | |
1754 | static void __exit nf_conntrack_h323_fini(void) | |
1755 | { | |
1756 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]); | |
1757 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); | |
1758 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); | |
1759 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); | |
1760 | kfree(h323_buffer); | |
0d53778e | 1761 | pr_debug("nf_ct_h323: fini\n"); |
f587de0e PM |
1762 | } |
1763 | ||
1764 | /****************************************************************************/ | |
1765 | static int __init nf_conntrack_h323_init(void) | |
1766 | { | |
1767 | int ret; | |
1768 | ||
1769 | h323_buffer = kmalloc(65536, GFP_KERNEL); | |
1770 | if (!h323_buffer) | |
1771 | return -ENOMEM; | |
1772 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]); | |
1773 | if (ret < 0) | |
1774 | goto err1; | |
1775 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]); | |
1776 | if (ret < 0) | |
1777 | goto err2; | |
1778 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]); | |
1779 | if (ret < 0) | |
1780 | goto err3; | |
1781 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]); | |
1782 | if (ret < 0) | |
1783 | goto err4; | |
0d53778e | 1784 | pr_debug("nf_ct_h323: init success\n"); |
f587de0e PM |
1785 | return 0; |
1786 | ||
1787 | err4: | |
1788 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); | |
1789 | err3: | |
1790 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); | |
1791 | err2: | |
1792 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); | |
1793 | err1: | |
1794 | return ret; | |
1795 | } | |
1796 | ||
1797 | /****************************************************************************/ | |
1798 | module_init(nf_conntrack_h323_init); | |
1799 | module_exit(nf_conntrack_h323_fini); | |
1800 | ||
1801 | EXPORT_SYMBOL_GPL(get_h225_addr); | |
1802 | EXPORT_SYMBOL_GPL(set_h245_addr_hook); | |
1803 | EXPORT_SYMBOL_GPL(set_h225_addr_hook); | |
1804 | EXPORT_SYMBOL_GPL(set_sig_addr_hook); | |
1805 | EXPORT_SYMBOL_GPL(set_ras_addr_hook); | |
1806 | EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); | |
1807 | EXPORT_SYMBOL_GPL(nat_t120_hook); | |
1808 | EXPORT_SYMBOL_GPL(nat_h245_hook); | |
1809 | EXPORT_SYMBOL_GPL(nat_callforwarding_hook); | |
1810 | EXPORT_SYMBOL_GPL(nat_q931_hook); | |
1811 | ||
1812 | MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); | |
1813 | MODULE_DESCRIPTION("H.323 connection tracking helper"); | |
1814 | MODULE_LICENSE("GPL"); | |
1815 | MODULE_ALIAS("ip_conntrack_h323"); |