Commit | Line | Data |
---|---|---|
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, | |
643a2c15 | 53 | union nf_inet_addr *addr, __be16 port) |
f587de0e | 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, | |
643a2c15 | 58 | union nf_inet_addr *addr, __be16 port) |
f587de0e | 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); | |
905e3e8e JE |
117 | const struct tcphdr *th; |
118 | struct tcphdr _tcph; | |
f587de0e PM |
119 | int tcpdatalen; |
120 | int tcpdataoff; | |
121 | unsigned char *tpkt; | |
122 | int tpktlen; | |
123 | int tpktoff; | |
124 | ||
125 | /* Get TCP header */ | |
3db05fea | 126 | th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph); |
f587de0e PM |
127 | if (th == NULL) |
128 | return 0; | |
129 | ||
130 | /* Get TCP data offset */ | |
131 | tcpdataoff = protoff + th->doff * 4; | |
132 | ||
133 | /* Get TCP data length */ | |
3db05fea | 134 | tcpdatalen = skb->len - tcpdataoff; |
f587de0e PM |
135 | if (tcpdatalen <= 0) /* No TCP data */ |
136 | goto clear_out; | |
137 | ||
138 | if (*data == NULL) { /* first TPKT */ | |
139 | /* Get first TPKT pointer */ | |
3db05fea | 140 | tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen, |
f587de0e PM |
141 | h323_buffer); |
142 | BUG_ON(tpkt == NULL); | |
143 | ||
144 | /* Validate TPKT identifier */ | |
145 | if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) { | |
146 | /* Netmeeting sends TPKT header and data separately */ | |
147 | if (info->tpkt_len[dir] > 0) { | |
0d53778e PM |
148 | pr_debug("nf_ct_h323: previous packet " |
149 | "indicated separate TPKT data of %hu " | |
150 | "bytes\n", info->tpkt_len[dir]); | |
f587de0e PM |
151 | if (info->tpkt_len[dir] <= tcpdatalen) { |
152 | /* Yes, there was a TPKT header | |
153 | * received */ | |
154 | *data = tpkt; | |
155 | *datalen = info->tpkt_len[dir]; | |
156 | *dataoff = 0; | |
157 | goto out; | |
158 | } | |
159 | ||
160 | /* Fragmented TPKT */ | |
0d53778e | 161 | pr_debug("nf_ct_h323: fragmented TPKT\n"); |
f587de0e PM |
162 | goto clear_out; |
163 | } | |
164 | ||
165 | /* It is not even a TPKT */ | |
166 | return 0; | |
167 | } | |
168 | tpktoff = 0; | |
169 | } else { /* Next TPKT */ | |
170 | tpktoff = *dataoff + *datalen; | |
171 | tcpdatalen -= tpktoff; | |
172 | if (tcpdatalen <= 4) /* No more TPKT */ | |
173 | goto clear_out; | |
174 | tpkt = *data + *datalen; | |
175 | ||
176 | /* Validate TPKT identifier */ | |
177 | if (tpkt[0] != 0x03 || tpkt[1] != 0) | |
178 | goto clear_out; | |
179 | } | |
180 | ||
181 | /* Validate TPKT length */ | |
182 | tpktlen = tpkt[2] * 256 + tpkt[3]; | |
183 | if (tpktlen < 4) | |
184 | goto clear_out; | |
185 | if (tpktlen > tcpdatalen) { | |
186 | if (tcpdatalen == 4) { /* Separate TPKT header */ | |
187 | /* Netmeeting sends TPKT header and data separately */ | |
0d53778e PM |
188 | pr_debug("nf_ct_h323: separate TPKT header indicates " |
189 | "there will be TPKT data of %hu bytes\n", | |
190 | tpktlen - 4); | |
f587de0e PM |
191 | info->tpkt_len[dir] = tpktlen - 4; |
192 | return 0; | |
193 | } | |
194 | ||
195 | if (net_ratelimit()) | |
196 | printk("nf_ct_h323: incomplete TPKT (fragmented?)\n"); | |
197 | goto clear_out; | |
198 | } | |
199 | ||
200 | /* This is the encapsulated data */ | |
201 | *data = tpkt + 4; | |
202 | *datalen = tpktlen - 4; | |
203 | *dataoff = tpktoff + 4; | |
204 | ||
205 | out: | |
206 | /* Clear TPKT length */ | |
207 | info->tpkt_len[dir] = 0; | |
208 | return 1; | |
209 | ||
210 | clear_out: | |
211 | info->tpkt_len[dir] = 0; | |
212 | return 0; | |
213 | } | |
214 | ||
215 | /****************************************************************************/ | |
905e3e8e | 216 | static int get_h245_addr(struct nf_conn *ct, const unsigned char *data, |
f587de0e | 217 | H245_TransportAddress *taddr, |
643a2c15 | 218 | union nf_inet_addr *addr, __be16 *port) |
f587de0e | 219 | { |
905e3e8e | 220 | const unsigned char *p; |
f587de0e PM |
221 | int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
222 | int len; | |
223 | ||
224 | if (taddr->choice != eH245_TransportAddress_unicastAddress) | |
225 | return 0; | |
226 | ||
227 | switch (taddr->unicastAddress.choice) { | |
228 | case eUnicastAddress_iPAddress: | |
229 | if (family != AF_INET) | |
230 | return 0; | |
231 | p = data + taddr->unicastAddress.iPAddress.network; | |
232 | len = 4; | |
233 | break; | |
234 | case eUnicastAddress_iP6Address: | |
235 | if (family != AF_INET6) | |
236 | return 0; | |
237 | p = data + taddr->unicastAddress.iP6Address.network; | |
238 | len = 16; | |
239 | break; | |
240 | default: | |
241 | return 0; | |
242 | } | |
243 | ||
244 | memcpy(addr, p, len); | |
245 | memset((void *)addr + len, 0, sizeof(*addr) - len); | |
246 | memcpy(port, p + len, sizeof(__be16)); | |
247 | ||
248 | return 1; | |
249 | } | |
250 | ||
251 | /****************************************************************************/ | |
3db05fea | 252 | static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
253 | enum ip_conntrack_info ctinfo, |
254 | unsigned char **data, int dataoff, | |
255 | H245_TransportAddress *taddr) | |
256 | { | |
257 | int dir = CTINFO2DIR(ctinfo); | |
258 | int ret = 0; | |
259 | __be16 port; | |
260 | __be16 rtp_port, rtcp_port; | |
643a2c15 | 261 | union nf_inet_addr addr; |
f587de0e PM |
262 | struct nf_conntrack_expect *rtp_exp; |
263 | struct nf_conntrack_expect *rtcp_exp; | |
264 | typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp; | |
265 | ||
266 | /* Read RTP or RTCP address */ | |
267 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || | |
268 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
269 | port == 0) | |
270 | return 0; | |
271 | ||
272 | /* RTP port is even */ | |
273 | port &= htons(~1); | |
274 | rtp_port = port; | |
275 | rtcp_port = htons(ntohs(port) + 1); | |
276 | ||
277 | /* Create expect for RTP */ | |
6823645d | 278 | if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 279 | return -1; |
6002f266 PM |
280 | nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, |
281 | ct->tuplehash[!dir].tuple.src.l3num, | |
6823645d PM |
282 | &ct->tuplehash[!dir].tuple.src.u3, |
283 | &ct->tuplehash[!dir].tuple.dst.u3, | |
284 | IPPROTO_UDP, NULL, &rtp_port); | |
f587de0e PM |
285 | |
286 | /* Create expect for RTCP */ | |
6823645d PM |
287 | if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) { |
288 | nf_ct_expect_put(rtp_exp); | |
f587de0e PM |
289 | return -1; |
290 | } | |
6002f266 PM |
291 | nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, |
292 | ct->tuplehash[!dir].tuple.src.l3num, | |
6823645d PM |
293 | &ct->tuplehash[!dir].tuple.src.u3, |
294 | &ct->tuplehash[!dir].tuple.dst.u3, | |
295 | IPPROTO_UDP, NULL, &rtcp_port); | |
f587de0e PM |
296 | |
297 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
601e68e1 | 298 | &ct->tuplehash[!dir].tuple.dst.u3, |
f587de0e PM |
299 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
300 | (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) && | |
301 | ct->status & IPS_NAT_MASK) { | |
302 | /* NAT needed */ | |
3db05fea | 303 | ret = nat_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
304 | taddr, port, rtp_port, rtp_exp, rtcp_exp); |
305 | } else { /* Conntrack only */ | |
6823645d PM |
306 | if (nf_ct_expect_related(rtp_exp) == 0) { |
307 | if (nf_ct_expect_related(rtcp_exp) == 0) { | |
0d53778e | 308 | pr_debug("nf_ct_h323: expect RTP "); |
f587de0e | 309 | NF_CT_DUMP_TUPLE(&rtp_exp->tuple); |
0d53778e | 310 | pr_debug("nf_ct_h323: expect RTCP "); |
f587de0e PM |
311 | NF_CT_DUMP_TUPLE(&rtcp_exp->tuple); |
312 | } else { | |
6823645d | 313 | nf_ct_unexpect_related(rtp_exp); |
f587de0e PM |
314 | ret = -1; |
315 | } | |
316 | } else | |
317 | ret = -1; | |
318 | } | |
319 | ||
6823645d PM |
320 | nf_ct_expect_put(rtp_exp); |
321 | nf_ct_expect_put(rtcp_exp); | |
f587de0e PM |
322 | |
323 | return ret; | |
324 | } | |
325 | ||
326 | /****************************************************************************/ | |
3db05fea | 327 | static int expect_t120(struct sk_buff *skb, |
f587de0e PM |
328 | struct nf_conn *ct, |
329 | enum ip_conntrack_info ctinfo, | |
330 | unsigned char **data, int dataoff, | |
331 | H245_TransportAddress *taddr) | |
332 | { | |
333 | int dir = CTINFO2DIR(ctinfo); | |
334 | int ret = 0; | |
335 | __be16 port; | |
643a2c15 | 336 | union nf_inet_addr addr; |
f587de0e PM |
337 | struct nf_conntrack_expect *exp; |
338 | typeof(nat_t120_hook) nat_t120; | |
339 | ||
340 | /* Read T.120 address */ | |
341 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || | |
342 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
343 | port == 0) | |
344 | return 0; | |
345 | ||
346 | /* Create expect for T.120 connections */ | |
6823645d | 347 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 348 | return -1; |
6002f266 PM |
349 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, |
350 | ct->tuplehash[!dir].tuple.src.l3num, | |
6823645d PM |
351 | &ct->tuplehash[!dir].tuple.src.u3, |
352 | &ct->tuplehash[!dir].tuple.dst.u3, | |
353 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
354 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */ |
355 | ||
356 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
357 | &ct->tuplehash[!dir].tuple.dst.u3, | |
358 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
359 | (nat_t120 = rcu_dereference(nat_t120_hook)) && | |
360 | ct->status & IPS_NAT_MASK) { | |
361 | /* NAT needed */ | |
3db05fea | 362 | ret = nat_t120(skb, ct, ctinfo, data, dataoff, taddr, |
f587de0e PM |
363 | port, exp); |
364 | } else { /* Conntrack only */ | |
6823645d | 365 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 366 | pr_debug("nf_ct_h323: expect T.120 "); |
f587de0e PM |
367 | NF_CT_DUMP_TUPLE(&exp->tuple); |
368 | } else | |
369 | ret = -1; | |
370 | } | |
371 | ||
6823645d | 372 | nf_ct_expect_put(exp); |
f587de0e PM |
373 | |
374 | return ret; | |
375 | } | |
376 | ||
377 | /****************************************************************************/ | |
3db05fea | 378 | static int process_h245_channel(struct sk_buff *skb, |
f587de0e PM |
379 | struct nf_conn *ct, |
380 | enum ip_conntrack_info ctinfo, | |
381 | unsigned char **data, int dataoff, | |
382 | H2250LogicalChannelParameters *channel) | |
383 | { | |
384 | int ret; | |
385 | ||
386 | if (channel->options & eH2250LogicalChannelParameters_mediaChannel) { | |
387 | /* RTP */ | |
3db05fea | 388 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
389 | &channel->mediaChannel); |
390 | if (ret < 0) | |
391 | return -1; | |
392 | } | |
393 | ||
394 | if (channel-> | |
395 | options & eH2250LogicalChannelParameters_mediaControlChannel) { | |
396 | /* RTCP */ | |
3db05fea | 397 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
398 | &channel->mediaControlChannel); |
399 | if (ret < 0) | |
400 | return -1; | |
401 | } | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | /****************************************************************************/ | |
3db05fea | 407 | static int process_olc(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
408 | enum ip_conntrack_info ctinfo, |
409 | unsigned char **data, int dataoff, | |
410 | OpenLogicalChannel *olc) | |
411 | { | |
412 | int ret; | |
413 | ||
0d53778e | 414 | pr_debug("nf_ct_h323: OpenLogicalChannel\n"); |
f587de0e PM |
415 | |
416 | if (olc->forwardLogicalChannelParameters.multiplexParameters.choice == | |
417 | eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters) | |
418 | { | |
3db05fea | 419 | ret = process_h245_channel(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
420 | &olc-> |
421 | forwardLogicalChannelParameters. | |
422 | multiplexParameters. | |
423 | h2250LogicalChannelParameters); | |
424 | if (ret < 0) | |
425 | return -1; | |
426 | } | |
427 | ||
428 | if ((olc->options & | |
429 | eOpenLogicalChannel_reverseLogicalChannelParameters) && | |
430 | (olc->reverseLogicalChannelParameters.options & | |
431 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters) | |
432 | && (olc->reverseLogicalChannelParameters.multiplexParameters. | |
433 | choice == | |
434 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) | |
435 | { | |
436 | ret = | |
3db05fea | 437 | process_h245_channel(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
438 | &olc-> |
439 | reverseLogicalChannelParameters. | |
440 | multiplexParameters. | |
441 | h2250LogicalChannelParameters); | |
442 | if (ret < 0) | |
443 | return -1; | |
444 | } | |
445 | ||
446 | if ((olc->options & eOpenLogicalChannel_separateStack) && | |
447 | olc->forwardLogicalChannelParameters.dataType.choice == | |
448 | eDataType_data && | |
449 | olc->forwardLogicalChannelParameters.dataType.data.application. | |
450 | choice == eDataApplicationCapability_application_t120 && | |
451 | olc->forwardLogicalChannelParameters.dataType.data.application. | |
452 | t120.choice == eDataProtocolCapability_separateLANStack && | |
453 | olc->separateStack.networkAddress.choice == | |
454 | eNetworkAccessParameters_networkAddress_localAreaAddress) { | |
3db05fea | 455 | ret = expect_t120(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
456 | &olc->separateStack.networkAddress. |
457 | localAreaAddress); | |
458 | if (ret < 0) | |
459 | return -1; | |
460 | } | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
465 | /****************************************************************************/ | |
3db05fea | 466 | static int process_olca(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
467 | enum ip_conntrack_info ctinfo, |
468 | unsigned char **data, int dataoff, | |
469 | OpenLogicalChannelAck *olca) | |
470 | { | |
471 | H2250LogicalChannelAckParameters *ack; | |
472 | int ret; | |
473 | ||
0d53778e | 474 | pr_debug("nf_ct_h323: OpenLogicalChannelAck\n"); |
f587de0e PM |
475 | |
476 | if ((olca->options & | |
477 | eOpenLogicalChannelAck_reverseLogicalChannelParameters) && | |
478 | (olca->reverseLogicalChannelParameters.options & | |
479 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters) | |
480 | && (olca->reverseLogicalChannelParameters.multiplexParameters. | |
481 | choice == | |
482 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) | |
483 | { | |
3db05fea | 484 | ret = process_h245_channel(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
485 | &olca-> |
486 | reverseLogicalChannelParameters. | |
487 | multiplexParameters. | |
488 | h2250LogicalChannelParameters); | |
489 | if (ret < 0) | |
490 | return -1; | |
491 | } | |
492 | ||
493 | if ((olca->options & | |
494 | eOpenLogicalChannelAck_forwardMultiplexAckParameters) && | |
495 | (olca->forwardMultiplexAckParameters.choice == | |
496 | eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters)) | |
497 | { | |
498 | ack = &olca->forwardMultiplexAckParameters. | |
499 | h2250LogicalChannelAckParameters; | |
500 | if (ack->options & | |
501 | eH2250LogicalChannelAckParameters_mediaChannel) { | |
502 | /* RTP */ | |
3db05fea | 503 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
504 | &ack->mediaChannel); |
505 | if (ret < 0) | |
506 | return -1; | |
507 | } | |
508 | ||
509 | if (ack->options & | |
510 | eH2250LogicalChannelAckParameters_mediaControlChannel) { | |
511 | /* RTCP */ | |
3db05fea | 512 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
513 | &ack->mediaControlChannel); |
514 | if (ret < 0) | |
515 | return -1; | |
516 | } | |
517 | } | |
518 | ||
f8f1c08e JMZ |
519 | if ((olca->options & eOpenLogicalChannelAck_separateStack) && |
520 | olca->separateStack.networkAddress.choice == | |
521 | eNetworkAccessParameters_networkAddress_localAreaAddress) { | |
3db05fea | 522 | ret = expect_t120(skb, ct, ctinfo, data, dataoff, |
f8f1c08e JMZ |
523 | &olca->separateStack.networkAddress. |
524 | localAreaAddress); | |
525 | if (ret < 0) | |
526 | return -1; | |
527 | } | |
528 | ||
f587de0e PM |
529 | return 0; |
530 | } | |
531 | ||
532 | /****************************************************************************/ | |
3db05fea | 533 | static int process_h245(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
534 | enum ip_conntrack_info ctinfo, |
535 | unsigned char **data, int dataoff, | |
536 | MultimediaSystemControlMessage *mscm) | |
537 | { | |
538 | switch (mscm->choice) { | |
539 | case eMultimediaSystemControlMessage_request: | |
540 | if (mscm->request.choice == | |
541 | eRequestMessage_openLogicalChannel) { | |
3db05fea | 542 | return process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
543 | &mscm->request.openLogicalChannel); |
544 | } | |
0d53778e PM |
545 | pr_debug("nf_ct_h323: H.245 Request %d\n", |
546 | mscm->request.choice); | |
f587de0e PM |
547 | break; |
548 | case eMultimediaSystemControlMessage_response: | |
549 | if (mscm->response.choice == | |
550 | eResponseMessage_openLogicalChannelAck) { | |
3db05fea | 551 | return process_olca(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
552 | &mscm->response. |
553 | openLogicalChannelAck); | |
554 | } | |
0d53778e PM |
555 | pr_debug("nf_ct_h323: H.245 Response %d\n", |
556 | mscm->response.choice); | |
f587de0e PM |
557 | break; |
558 | default: | |
0d53778e | 559 | pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice); |
f587de0e PM |
560 | break; |
561 | } | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
566 | /****************************************************************************/ | |
3db05fea | 567 | static int h245_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
568 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
569 | { | |
570 | static MultimediaSystemControlMessage mscm; | |
571 | unsigned char *data = NULL; | |
572 | int datalen; | |
573 | int dataoff; | |
574 | int ret; | |
575 | ||
576 | /* Until there's been traffic both ways, don't look in packets. */ | |
577 | if (ctinfo != IP_CT_ESTABLISHED && | |
578 | ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) { | |
579 | return NF_ACCEPT; | |
580 | } | |
3db05fea | 581 | pr_debug("nf_ct_h245: skblen = %u\n", skb->len); |
f587de0e PM |
582 | |
583 | spin_lock_bh(&nf_h323_lock); | |
584 | ||
585 | /* Process each TPKT */ | |
3db05fea | 586 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
f587de0e | 587 | &data, &datalen, &dataoff)) { |
0d53778e | 588 | pr_debug("nf_ct_h245: TPKT len=%d ", datalen); |
f587de0e PM |
589 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
590 | ||
591 | /* Decode H.245 signal */ | |
592 | ret = DecodeMultimediaSystemControlMessage(data, datalen, | |
593 | &mscm); | |
594 | if (ret < 0) { | |
0d53778e PM |
595 | pr_debug("nf_ct_h245: decoding error: %s\n", |
596 | ret == H323_ERROR_BOUND ? | |
597 | "out of bound" : "out of range"); | |
f587de0e PM |
598 | /* We don't drop when decoding error */ |
599 | break; | |
600 | } | |
601 | ||
602 | /* Process H.245 signal */ | |
3db05fea | 603 | if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0) |
f587de0e PM |
604 | goto drop; |
605 | } | |
606 | ||
607 | spin_unlock_bh(&nf_h323_lock); | |
608 | return NF_ACCEPT; | |
609 | ||
610 | drop: | |
611 | spin_unlock_bh(&nf_h323_lock); | |
612 | if (net_ratelimit()) | |
613 | printk("nf_ct_h245: packet dropped\n"); | |
614 | return NF_DROP; | |
615 | } | |
616 | ||
617 | /****************************************************************************/ | |
6002f266 PM |
618 | static const struct nf_conntrack_expect_policy h245_exp_policy = { |
619 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */, | |
620 | .timeout = 240, | |
621 | }; | |
622 | ||
f587de0e PM |
623 | static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { |
624 | .name = "H.245", | |
625 | .me = THIS_MODULE, | |
f587de0e | 626 | .tuple.dst.protonum = IPPROTO_UDP, |
6002f266 PM |
627 | .help = h245_help, |
628 | .expect_policy = &h245_exp_policy, | |
f587de0e PM |
629 | }; |
630 | ||
631 | /****************************************************************************/ | |
632 | int get_h225_addr(struct nf_conn *ct, unsigned char *data, | |
633 | TransportAddress *taddr, | |
643a2c15 | 634 | union nf_inet_addr *addr, __be16 *port) |
f587de0e | 635 | { |
905e3e8e | 636 | const unsigned char *p; |
f587de0e PM |
637 | int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
638 | int len; | |
639 | ||
640 | switch (taddr->choice) { | |
641 | case eTransportAddress_ipAddress: | |
642 | if (family != AF_INET) | |
643 | return 0; | |
644 | p = data + taddr->ipAddress.ip; | |
645 | len = 4; | |
646 | break; | |
647 | case eTransportAddress_ip6Address: | |
648 | if (family != AF_INET6) | |
649 | return 0; | |
bb807245 | 650 | p = data + taddr->ip6Address.ip; |
f587de0e PM |
651 | len = 16; |
652 | break; | |
653 | default: | |
654 | return 0; | |
655 | } | |
656 | ||
657 | memcpy(addr, p, len); | |
658 | memset((void *)addr + len, 0, sizeof(*addr) - len); | |
659 | memcpy(port, p + len, sizeof(__be16)); | |
660 | ||
661 | return 1; | |
662 | } | |
663 | ||
664 | /****************************************************************************/ | |
3db05fea | 665 | static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
666 | enum ip_conntrack_info ctinfo, |
667 | unsigned char **data, int dataoff, | |
668 | TransportAddress *taddr) | |
669 | { | |
670 | int dir = CTINFO2DIR(ctinfo); | |
671 | int ret = 0; | |
672 | __be16 port; | |
643a2c15 | 673 | union nf_inet_addr addr; |
f587de0e PM |
674 | struct nf_conntrack_expect *exp; |
675 | typeof(nat_h245_hook) nat_h245; | |
676 | ||
677 | /* Read h245Address */ | |
678 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || | |
679 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
680 | port == 0) | |
681 | return 0; | |
682 | ||
683 | /* Create expect for h245 connection */ | |
6823645d | 684 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 685 | return -1; |
6002f266 PM |
686 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, |
687 | ct->tuplehash[!dir].tuple.src.l3num, | |
6823645d PM |
688 | &ct->tuplehash[!dir].tuple.src.u3, |
689 | &ct->tuplehash[!dir].tuple.dst.u3, | |
690 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
691 | exp->helper = &nf_conntrack_helper_h245; |
692 | ||
693 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
694 | &ct->tuplehash[!dir].tuple.dst.u3, | |
695 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
696 | (nat_h245 = rcu_dereference(nat_h245_hook)) && | |
697 | ct->status & IPS_NAT_MASK) { | |
698 | /* NAT needed */ | |
3db05fea | 699 | ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr, |
f587de0e PM |
700 | port, exp); |
701 | } else { /* Conntrack only */ | |
6823645d | 702 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 703 | pr_debug("nf_ct_q931: expect H.245 "); |
f587de0e PM |
704 | NF_CT_DUMP_TUPLE(&exp->tuple); |
705 | } else | |
706 | ret = -1; | |
707 | } | |
708 | ||
6823645d | 709 | nf_ct_expect_put(exp); |
f587de0e PM |
710 | |
711 | return ret; | |
712 | } | |
713 | ||
714 | /* If the calling party is on the same side of the forward-to party, | |
715 | * we don't need to track the second call */ | |
905e3e8e JE |
716 | static int callforward_do_filter(const union nf_inet_addr *src, |
717 | const union nf_inet_addr *dst, int family) | |
f587de0e | 718 | { |
1e796fda | 719 | const struct nf_afinfo *afinfo; |
f587de0e PM |
720 | struct flowi fl1, fl2; |
721 | int ret = 0; | |
722 | ||
1841a4c7 PM |
723 | /* rcu_read_lock()ed by nf_hook_slow() */ |
724 | afinfo = nf_get_afinfo(family); | |
725 | if (!afinfo) | |
726 | return 0; | |
727 | ||
f587de0e PM |
728 | memset(&fl1, 0, sizeof(fl1)); |
729 | memset(&fl2, 0, sizeof(fl2)); | |
730 | ||
731 | switch (family) { | |
732 | case AF_INET: { | |
733 | struct rtable *rt1, *rt2; | |
734 | ||
735 | fl1.fl4_dst = src->ip; | |
736 | fl2.fl4_dst = dst->ip; | |
1841a4c7 PM |
737 | if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) { |
738 | if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) { | |
f587de0e PM |
739 | if (rt1->rt_gateway == rt2->rt_gateway && |
740 | rt1->u.dst.dev == rt2->u.dst.dev) | |
741 | ret = 1; | |
742 | dst_release(&rt2->u.dst); | |
743 | } | |
744 | dst_release(&rt1->u.dst); | |
745 | } | |
746 | break; | |
747 | } | |
1841a4c7 PM |
748 | #if defined(CONFIG_NF_CONNTRACK_IPV6) || \ |
749 | defined(CONFIG_NF_CONNTRACK_IPV6_MODULE) | |
f587de0e PM |
750 | case AF_INET6: { |
751 | struct rt6_info *rt1, *rt2; | |
752 | ||
753 | memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst)); | |
754 | memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst)); | |
1841a4c7 PM |
755 | if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) { |
756 | if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) { | |
f587de0e | 757 | if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway, |
601e68e1 | 758 | sizeof(rt1->rt6i_gateway)) && |
f587de0e PM |
759 | rt1->u.dst.dev == rt2->u.dst.dev) |
760 | ret = 1; | |
761 | dst_release(&rt2->u.dst); | |
762 | } | |
763 | dst_release(&rt1->u.dst); | |
764 | } | |
765 | break; | |
766 | } | |
767 | #endif | |
768 | } | |
769 | return ret; | |
770 | ||
771 | } | |
772 | ||
773 | /****************************************************************************/ | |
3db05fea | 774 | static int expect_callforwarding(struct sk_buff *skb, |
f587de0e PM |
775 | struct nf_conn *ct, |
776 | enum ip_conntrack_info ctinfo, | |
777 | unsigned char **data, int dataoff, | |
778 | TransportAddress *taddr) | |
779 | { | |
780 | int dir = CTINFO2DIR(ctinfo); | |
781 | int ret = 0; | |
782 | __be16 port; | |
643a2c15 | 783 | union nf_inet_addr addr; |
f587de0e PM |
784 | struct nf_conntrack_expect *exp; |
785 | typeof(nat_callforwarding_hook) nat_callforwarding; | |
786 | ||
787 | /* Read alternativeAddress */ | |
788 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) | |
789 | return 0; | |
790 | ||
791 | /* If the calling party is on the same side of the forward-to party, | |
792 | * we don't need to track the second call */ | |
793 | if (callforward_filter && | |
794 | callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3, | |
601e68e1 | 795 | ct->tuplehash[!dir].tuple.src.l3num)) { |
0d53778e | 796 | pr_debug("nf_ct_q931: Call Forwarding not tracked\n"); |
f587de0e PM |
797 | return 0; |
798 | } | |
799 | ||
800 | /* Create expect for the second call leg */ | |
6823645d | 801 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 802 | return -1; |
6002f266 PM |
803 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, |
804 | ct->tuplehash[!dir].tuple.src.l3num, | |
6823645d PM |
805 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
806 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
807 | exp->helper = nf_conntrack_helper_q931; |
808 | ||
809 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
810 | &ct->tuplehash[!dir].tuple.dst.u3, | |
811 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
812 | (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && | |
813 | ct->status & IPS_NAT_MASK) { | |
814 | /* Need NAT */ | |
3db05fea | 815 | ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
816 | taddr, port, exp); |
817 | } else { /* Conntrack only */ | |
6823645d | 818 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 819 | pr_debug("nf_ct_q931: expect Call Forwarding "); |
f587de0e PM |
820 | NF_CT_DUMP_TUPLE(&exp->tuple); |
821 | } else | |
822 | ret = -1; | |
823 | } | |
824 | ||
6823645d | 825 | nf_ct_expect_put(exp); |
f587de0e PM |
826 | |
827 | return ret; | |
828 | } | |
829 | ||
830 | /****************************************************************************/ | |
3db05fea | 831 | static int process_setup(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
832 | enum ip_conntrack_info ctinfo, |
833 | unsigned char **data, int dataoff, | |
834 | Setup_UUIE *setup) | |
835 | { | |
836 | int dir = CTINFO2DIR(ctinfo); | |
837 | int ret; | |
838 | int i; | |
839 | __be16 port; | |
643a2c15 | 840 | union nf_inet_addr addr; |
f587de0e PM |
841 | typeof(set_h225_addr_hook) set_h225_addr; |
842 | ||
0d53778e | 843 | pr_debug("nf_ct_q931: Setup\n"); |
f587de0e PM |
844 | |
845 | if (setup->options & eSetup_UUIE_h245Address) { | |
3db05fea | 846 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
847 | &setup->h245Address); |
848 | if (ret < 0) | |
849 | return -1; | |
850 | } | |
851 | ||
852 | set_h225_addr = rcu_dereference(set_h225_addr_hook); | |
853 | if ((setup->options & eSetup_UUIE_destCallSignalAddress) && | |
6aebb9b2 | 854 | (set_h225_addr) && ct->status & IPS_NAT_MASK && |
f587de0e | 855 | get_h225_addr(ct, *data, &setup->destCallSignalAddress, |
601e68e1 | 856 | &addr, &port) && |
f587de0e | 857 | memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { |
0d53778e PM |
858 | pr_debug("nf_ct_q931: set destCallSignalAddress " |
859 | NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n", | |
860 | NIP6(*(struct in6_addr *)&addr), ntohs(port), | |
861 | NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.src.u3), | |
862 | ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port)); | |
3db05fea | 863 | ret = set_h225_addr(skb, data, dataoff, |
f587de0e PM |
864 | &setup->destCallSignalAddress, |
865 | &ct->tuplehash[!dir].tuple.src.u3, | |
866 | ct->tuplehash[!dir].tuple.src.u.tcp.port); | |
867 | if (ret < 0) | |
868 | return -1; | |
869 | } | |
870 | ||
871 | if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && | |
872 | (set_h225_addr) && ct->status & IPS_NAT_MASK && | |
873 | get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, | |
601e68e1 | 874 | &addr, &port) && |
f587de0e | 875 | memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { |
0d53778e PM |
876 | pr_debug("nf_ct_q931: set sourceCallSignalAddress " |
877 | NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n", | |
878 | NIP6(*(struct in6_addr *)&addr), ntohs(port), | |
879 | NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.dst.u3), | |
880 | ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); | |
3db05fea | 881 | ret = set_h225_addr(skb, data, dataoff, |
f587de0e PM |
882 | &setup->sourceCallSignalAddress, |
883 | &ct->tuplehash[!dir].tuple.dst.u3, | |
884 | ct->tuplehash[!dir].tuple.dst.u.tcp.port); | |
885 | if (ret < 0) | |
886 | return -1; | |
887 | } | |
888 | ||
889 | if (setup->options & eSetup_UUIE_fastStart) { | |
890 | for (i = 0; i < setup->fastStart.count; i++) { | |
3db05fea | 891 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
892 | &setup->fastStart.item[i]); |
893 | if (ret < 0) | |
894 | return -1; | |
895 | } | |
896 | } | |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
901 | /****************************************************************************/ | |
3db05fea | 902 | static int process_callproceeding(struct sk_buff *skb, |
f587de0e PM |
903 | struct nf_conn *ct, |
904 | enum ip_conntrack_info ctinfo, | |
905 | unsigned char **data, int dataoff, | |
906 | CallProceeding_UUIE *callproc) | |
907 | { | |
908 | int ret; | |
909 | int i; | |
910 | ||
0d53778e | 911 | pr_debug("nf_ct_q931: CallProceeding\n"); |
f587de0e PM |
912 | |
913 | if (callproc->options & eCallProceeding_UUIE_h245Address) { | |
3db05fea | 914 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
915 | &callproc->h245Address); |
916 | if (ret < 0) | |
917 | return -1; | |
918 | } | |
919 | ||
920 | if (callproc->options & eCallProceeding_UUIE_fastStart) { | |
921 | for (i = 0; i < callproc->fastStart.count; i++) { | |
3db05fea | 922 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
923 | &callproc->fastStart.item[i]); |
924 | if (ret < 0) | |
925 | return -1; | |
926 | } | |
927 | } | |
928 | ||
929 | return 0; | |
930 | } | |
931 | ||
932 | /****************************************************************************/ | |
3db05fea | 933 | static int process_connect(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
934 | enum ip_conntrack_info ctinfo, |
935 | unsigned char **data, int dataoff, | |
936 | Connect_UUIE *connect) | |
937 | { | |
938 | int ret; | |
939 | int i; | |
940 | ||
0d53778e | 941 | pr_debug("nf_ct_q931: Connect\n"); |
f587de0e PM |
942 | |
943 | if (connect->options & eConnect_UUIE_h245Address) { | |
3db05fea | 944 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
945 | &connect->h245Address); |
946 | if (ret < 0) | |
947 | return -1; | |
948 | } | |
949 | ||
950 | if (connect->options & eConnect_UUIE_fastStart) { | |
951 | for (i = 0; i < connect->fastStart.count; i++) { | |
3db05fea | 952 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
953 | &connect->fastStart.item[i]); |
954 | if (ret < 0) | |
955 | return -1; | |
956 | } | |
957 | } | |
958 | ||
959 | return 0; | |
960 | } | |
961 | ||
962 | /****************************************************************************/ | |
3db05fea | 963 | static int process_alerting(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
964 | enum ip_conntrack_info ctinfo, |
965 | unsigned char **data, int dataoff, | |
966 | Alerting_UUIE *alert) | |
967 | { | |
968 | int ret; | |
969 | int i; | |
970 | ||
0d53778e | 971 | pr_debug("nf_ct_q931: Alerting\n"); |
f587de0e PM |
972 | |
973 | if (alert->options & eAlerting_UUIE_h245Address) { | |
3db05fea | 974 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
975 | &alert->h245Address); |
976 | if (ret < 0) | |
977 | return -1; | |
978 | } | |
979 | ||
980 | if (alert->options & eAlerting_UUIE_fastStart) { | |
981 | for (i = 0; i < alert->fastStart.count; i++) { | |
3db05fea | 982 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
983 | &alert->fastStart.item[i]); |
984 | if (ret < 0) | |
985 | return -1; | |
986 | } | |
987 | } | |
988 | ||
989 | return 0; | |
990 | } | |
991 | ||
f587de0e | 992 | /****************************************************************************/ |
3db05fea | 993 | static int process_facility(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
994 | enum ip_conntrack_info ctinfo, |
995 | unsigned char **data, int dataoff, | |
996 | Facility_UUIE *facility) | |
997 | { | |
998 | int ret; | |
999 | int i; | |
1000 | ||
0d53778e | 1001 | pr_debug("nf_ct_q931: Facility\n"); |
f587de0e PM |
1002 | |
1003 | if (facility->reason.choice == eFacilityReason_callForwarded) { | |
1004 | if (facility->options & eFacility_UUIE_alternativeAddress) | |
3db05fea | 1005 | return expect_callforwarding(skb, ct, ctinfo, data, |
f587de0e PM |
1006 | dataoff, |
1007 | &facility-> | |
1008 | alternativeAddress); | |
1009 | return 0; | |
1010 | } | |
1011 | ||
1012 | if (facility->options & eFacility_UUIE_h245Address) { | |
3db05fea | 1013 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1014 | &facility->h245Address); |
1015 | if (ret < 0) | |
1016 | return -1; | |
1017 | } | |
1018 | ||
1019 | if (facility->options & eFacility_UUIE_fastStart) { | |
1020 | for (i = 0; i < facility->fastStart.count; i++) { | |
3db05fea | 1021 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1022 | &facility->fastStart.item[i]); |
1023 | if (ret < 0) | |
1024 | return -1; | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | /****************************************************************************/ | |
3db05fea | 1032 | static int process_progress(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1033 | enum ip_conntrack_info ctinfo, |
1034 | unsigned char **data, int dataoff, | |
1035 | Progress_UUIE *progress) | |
1036 | { | |
1037 | int ret; | |
1038 | int i; | |
1039 | ||
0d53778e | 1040 | pr_debug("nf_ct_q931: Progress\n"); |
f587de0e PM |
1041 | |
1042 | if (progress->options & eProgress_UUIE_h245Address) { | |
3db05fea | 1043 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1044 | &progress->h245Address); |
1045 | if (ret < 0) | |
1046 | return -1; | |
1047 | } | |
1048 | ||
1049 | if (progress->options & eProgress_UUIE_fastStart) { | |
1050 | for (i = 0; i < progress->fastStart.count; i++) { | |
3db05fea | 1051 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1052 | &progress->fastStart.item[i]); |
1053 | if (ret < 0) | |
1054 | return -1; | |
1055 | } | |
1056 | } | |
1057 | ||
1058 | return 0; | |
1059 | } | |
1060 | ||
1061 | /****************************************************************************/ | |
3db05fea | 1062 | static int process_q931(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1063 | enum ip_conntrack_info ctinfo, |
1064 | unsigned char **data, int dataoff, Q931 *q931) | |
1065 | { | |
1066 | H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; | |
1067 | int i; | |
1068 | int ret = 0; | |
1069 | ||
1070 | switch (pdu->h323_message_body.choice) { | |
1071 | case eH323_UU_PDU_h323_message_body_setup: | |
3db05fea | 1072 | ret = process_setup(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1073 | &pdu->h323_message_body.setup); |
1074 | break; | |
1075 | case eH323_UU_PDU_h323_message_body_callProceeding: | |
3db05fea | 1076 | ret = process_callproceeding(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1077 | &pdu->h323_message_body. |
1078 | callProceeding); | |
1079 | break; | |
1080 | case eH323_UU_PDU_h323_message_body_connect: | |
3db05fea | 1081 | ret = process_connect(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1082 | &pdu->h323_message_body.connect); |
1083 | break; | |
1084 | case eH323_UU_PDU_h323_message_body_alerting: | |
3db05fea | 1085 | ret = process_alerting(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1086 | &pdu->h323_message_body.alerting); |
1087 | break; | |
f587de0e | 1088 | case eH323_UU_PDU_h323_message_body_facility: |
3db05fea | 1089 | ret = process_facility(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1090 | &pdu->h323_message_body.facility); |
1091 | break; | |
1092 | case eH323_UU_PDU_h323_message_body_progress: | |
3db05fea | 1093 | ret = process_progress(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1094 | &pdu->h323_message_body.progress); |
1095 | break; | |
1096 | default: | |
0d53778e PM |
1097 | pr_debug("nf_ct_q931: Q.931 signal %d\n", |
1098 | pdu->h323_message_body.choice); | |
f587de0e PM |
1099 | break; |
1100 | } | |
1101 | ||
1102 | if (ret < 0) | |
1103 | return -1; | |
1104 | ||
1105 | if (pdu->options & eH323_UU_PDU_h245Control) { | |
1106 | for (i = 0; i < pdu->h245Control.count; i++) { | |
3db05fea | 1107 | ret = process_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1108 | &pdu->h245Control.item[i]); |
1109 | if (ret < 0) | |
1110 | return -1; | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | return 0; | |
1115 | } | |
1116 | ||
1117 | /****************************************************************************/ | |
3db05fea | 1118 | static int q931_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1119 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
1120 | { | |
1121 | static Q931 q931; | |
1122 | unsigned char *data = NULL; | |
1123 | int datalen; | |
1124 | int dataoff; | |
1125 | int ret; | |
1126 | ||
1127 | /* Until there's been traffic both ways, don't look in packets. */ | |
1128 | if (ctinfo != IP_CT_ESTABLISHED && | |
1129 | ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) { | |
1130 | return NF_ACCEPT; | |
1131 | } | |
3db05fea | 1132 | pr_debug("nf_ct_q931: skblen = %u\n", skb->len); |
f587de0e PM |
1133 | |
1134 | spin_lock_bh(&nf_h323_lock); | |
1135 | ||
1136 | /* Process each TPKT */ | |
3db05fea | 1137 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
f587de0e | 1138 | &data, &datalen, &dataoff)) { |
0d53778e | 1139 | pr_debug("nf_ct_q931: TPKT len=%d ", datalen); |
f587de0e PM |
1140 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
1141 | ||
1142 | /* Decode Q.931 signal */ | |
1143 | ret = DecodeQ931(data, datalen, &q931); | |
1144 | if (ret < 0) { | |
0d53778e PM |
1145 | pr_debug("nf_ct_q931: decoding error: %s\n", |
1146 | ret == H323_ERROR_BOUND ? | |
1147 | "out of bound" : "out of range"); | |
f587de0e PM |
1148 | /* We don't drop when decoding error */ |
1149 | break; | |
1150 | } | |
1151 | ||
1152 | /* Process Q.931 signal */ | |
3db05fea | 1153 | if (process_q931(skb, ct, ctinfo, &data, dataoff, &q931) < 0) |
f587de0e PM |
1154 | goto drop; |
1155 | } | |
1156 | ||
1157 | spin_unlock_bh(&nf_h323_lock); | |
1158 | return NF_ACCEPT; | |
1159 | ||
1160 | drop: | |
1161 | spin_unlock_bh(&nf_h323_lock); | |
1162 | if (net_ratelimit()) | |
1163 | printk("nf_ct_q931: packet dropped\n"); | |
1164 | return NF_DROP; | |
1165 | } | |
1166 | ||
1167 | /****************************************************************************/ | |
6002f266 PM |
1168 | static const struct nf_conntrack_expect_policy q931_exp_policy = { |
1169 | /* T.120 and H.245 */ | |
1170 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, | |
1171 | .timeout = 240, | |
1172 | }; | |
1173 | ||
f587de0e PM |
1174 | static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { |
1175 | { | |
1176 | .name = "Q.931", | |
1177 | .me = THIS_MODULE, | |
f587de0e PM |
1178 | .tuple.src.l3num = AF_INET, |
1179 | .tuple.src.u.tcp.port = __constant_htons(Q931_PORT), | |
1180 | .tuple.dst.protonum = IPPROTO_TCP, | |
6002f266 PM |
1181 | .help = q931_help, |
1182 | .expect_policy = &q931_exp_policy, | |
f587de0e PM |
1183 | }, |
1184 | { | |
1185 | .name = "Q.931", | |
1186 | .me = THIS_MODULE, | |
f587de0e PM |
1187 | .tuple.src.l3num = AF_INET6, |
1188 | .tuple.src.u.tcp.port = __constant_htons(Q931_PORT), | |
1189 | .tuple.dst.protonum = IPPROTO_TCP, | |
6002f266 PM |
1190 | .help = q931_help, |
1191 | .expect_policy = &q931_exp_policy, | |
f587de0e PM |
1192 | }, |
1193 | }; | |
1194 | ||
1195 | /****************************************************************************/ | |
3db05fea | 1196 | static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1197 | int *datalen) |
1198 | { | |
905e3e8e JE |
1199 | const struct udphdr *uh; |
1200 | struct udphdr _uh; | |
f587de0e PM |
1201 | int dataoff; |
1202 | ||
3db05fea | 1203 | uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh); |
f587de0e PM |
1204 | if (uh == NULL) |
1205 | return NULL; | |
1206 | dataoff = protoff + sizeof(_uh); | |
3db05fea | 1207 | if (dataoff >= skb->len) |
f587de0e | 1208 | return NULL; |
3db05fea HX |
1209 | *datalen = skb->len - dataoff; |
1210 | return skb_header_pointer(skb, dataoff, *datalen, h323_buffer); | |
f587de0e PM |
1211 | } |
1212 | ||
1213 | /****************************************************************************/ | |
1214 | static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, | |
643a2c15 | 1215 | union nf_inet_addr *addr, |
f587de0e PM |
1216 | __be16 port) |
1217 | { | |
1218 | struct nf_conntrack_expect *exp; | |
1219 | struct nf_conntrack_tuple tuple; | |
1220 | ||
1221 | memset(&tuple.src.u3, 0, sizeof(tuple.src.u3)); | |
1222 | tuple.src.u.tcp.port = 0; | |
1223 | memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3)); | |
1224 | tuple.dst.u.tcp.port = port; | |
1225 | tuple.dst.protonum = IPPROTO_TCP; | |
1226 | ||
6823645d | 1227 | exp = __nf_ct_expect_find(&tuple); |
f587de0e PM |
1228 | if (exp && exp->master == ct) |
1229 | return exp; | |
1230 | return NULL; | |
1231 | } | |
1232 | ||
1233 | /****************************************************************************/ | |
1234 | static int set_expect_timeout(struct nf_conntrack_expect *exp, | |
1235 | unsigned timeout) | |
1236 | { | |
1237 | if (!exp || !del_timer(&exp->timeout)) | |
1238 | return 0; | |
1239 | ||
1240 | exp->timeout.expires = jiffies + timeout * HZ; | |
1241 | add_timer(&exp->timeout); | |
1242 | ||
1243 | return 1; | |
1244 | } | |
1245 | ||
1246 | /****************************************************************************/ | |
3db05fea | 1247 | static int expect_q931(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1248 | enum ip_conntrack_info ctinfo, |
1249 | unsigned char **data, | |
1250 | TransportAddress *taddr, int count) | |
1251 | { | |
1252 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1253 | int dir = CTINFO2DIR(ctinfo); | |
1254 | int ret = 0; | |
1255 | int i; | |
1256 | __be16 port; | |
643a2c15 | 1257 | union nf_inet_addr addr; |
f587de0e PM |
1258 | struct nf_conntrack_expect *exp; |
1259 | typeof(nat_q931_hook) nat_q931; | |
1260 | ||
1261 | /* Look for the first related address */ | |
1262 | for (i = 0; i < count; i++) { | |
1263 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && | |
1264 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, | |
601e68e1 | 1265 | sizeof(addr)) == 0 && port != 0) |
f587de0e PM |
1266 | break; |
1267 | } | |
1268 | ||
1269 | if (i >= count) /* Not found */ | |
1270 | return 0; | |
1271 | ||
1272 | /* Create expect for Q.931 */ | |
6823645d | 1273 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1274 | return -1; |
6002f266 PM |
1275 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, |
1276 | ct->tuplehash[!dir].tuple.src.l3num, | |
6823645d PM |
1277 | gkrouted_only ? /* only accept calls from GK? */ |
1278 | &ct->tuplehash[!dir].tuple.src.u3 : NULL, | |
1279 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1280 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1281 | exp->helper = nf_conntrack_helper_q931; |
1282 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ | |
1283 | ||
1284 | nat_q931 = rcu_dereference(nat_q931_hook); | |
1285 | if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */ | |
3db05fea | 1286 | ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp); |
f587de0e | 1287 | } else { /* Conntrack only */ |
6823645d | 1288 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1289 | pr_debug("nf_ct_ras: expect Q.931 "); |
f587de0e PM |
1290 | NF_CT_DUMP_TUPLE(&exp->tuple); |
1291 | ||
1292 | /* Save port for looking up expect in processing RCF */ | |
1293 | info->sig_port[dir] = port; | |
1294 | } else | |
1295 | ret = -1; | |
1296 | } | |
1297 | ||
6823645d | 1298 | nf_ct_expect_put(exp); |
f587de0e PM |
1299 | |
1300 | return ret; | |
1301 | } | |
1302 | ||
1303 | /****************************************************************************/ | |
3db05fea | 1304 | static int process_grq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1305 | enum ip_conntrack_info ctinfo, |
1306 | unsigned char **data, GatekeeperRequest *grq) | |
1307 | { | |
1308 | typeof(set_ras_addr_hook) set_ras_addr; | |
1309 | ||
0d53778e | 1310 | pr_debug("nf_ct_ras: GRQ\n"); |
f587de0e PM |
1311 | |
1312 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1313 | if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */ | |
3db05fea | 1314 | return set_ras_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1315 | &grq->rasAddress, 1); |
1316 | return 0; | |
1317 | } | |
1318 | ||
1319 | /****************************************************************************/ | |
3db05fea | 1320 | static int process_gcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1321 | enum ip_conntrack_info ctinfo, |
1322 | unsigned char **data, GatekeeperConfirm *gcf) | |
1323 | { | |
1324 | int dir = CTINFO2DIR(ctinfo); | |
1325 | int ret = 0; | |
1326 | __be16 port; | |
643a2c15 | 1327 | union nf_inet_addr addr; |
f587de0e PM |
1328 | struct nf_conntrack_expect *exp; |
1329 | ||
0d53778e | 1330 | pr_debug("nf_ct_ras: GCF\n"); |
f587de0e PM |
1331 | |
1332 | if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) | |
1333 | return 0; | |
1334 | ||
1335 | /* Registration port is the same as discovery port */ | |
1336 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && | |
1337 | port == ct->tuplehash[dir].tuple.src.u.udp.port) | |
1338 | return 0; | |
1339 | ||
1340 | /* Avoid RAS expectation loops. A GCF is never expected. */ | |
1341 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) | |
1342 | return 0; | |
1343 | ||
1344 | /* Need new expect */ | |
6823645d | 1345 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1346 | return -1; |
6002f266 PM |
1347 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, |
1348 | ct->tuplehash[!dir].tuple.src.l3num, | |
6823645d PM |
1349 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1350 | IPPROTO_UDP, NULL, &port); | |
f587de0e PM |
1351 | exp->helper = nf_conntrack_helper_ras; |
1352 | ||
6823645d | 1353 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1354 | pr_debug("nf_ct_ras: expect RAS "); |
f587de0e PM |
1355 | NF_CT_DUMP_TUPLE(&exp->tuple); |
1356 | } else | |
1357 | ret = -1; | |
1358 | ||
6823645d | 1359 | nf_ct_expect_put(exp); |
f587de0e PM |
1360 | |
1361 | return ret; | |
1362 | } | |
1363 | ||
1364 | /****************************************************************************/ | |
3db05fea | 1365 | static int process_rrq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1366 | enum ip_conntrack_info ctinfo, |
1367 | unsigned char **data, RegistrationRequest *rrq) | |
1368 | { | |
1369 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1370 | int ret; | |
1371 | typeof(set_ras_addr_hook) set_ras_addr; | |
1372 | ||
0d53778e | 1373 | pr_debug("nf_ct_ras: RRQ\n"); |
f587de0e | 1374 | |
3db05fea | 1375 | ret = expect_q931(skb, ct, ctinfo, data, |
f587de0e PM |
1376 | rrq->callSignalAddress.item, |
1377 | rrq->callSignalAddress.count); | |
1378 | if (ret < 0) | |
1379 | return -1; | |
1380 | ||
1381 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1382 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1383 | ret = set_ras_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1384 | rrq->rasAddress.item, |
1385 | rrq->rasAddress.count); | |
1386 | if (ret < 0) | |
1387 | return -1; | |
1388 | } | |
1389 | ||
1390 | if (rrq->options & eRegistrationRequest_timeToLive) { | |
0d53778e | 1391 | pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); |
f587de0e PM |
1392 | info->timeout = rrq->timeToLive; |
1393 | } else | |
1394 | info->timeout = default_rrq_ttl; | |
1395 | ||
1396 | return 0; | |
1397 | } | |
1398 | ||
1399 | /****************************************************************************/ | |
3db05fea | 1400 | static int process_rcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1401 | enum ip_conntrack_info ctinfo, |
1402 | unsigned char **data, RegistrationConfirm *rcf) | |
1403 | { | |
1404 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1405 | int dir = CTINFO2DIR(ctinfo); | |
1406 | int ret; | |
1407 | struct nf_conntrack_expect *exp; | |
1408 | typeof(set_sig_addr_hook) set_sig_addr; | |
1409 | ||
0d53778e | 1410 | pr_debug("nf_ct_ras: RCF\n"); |
f587de0e PM |
1411 | |
1412 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1413 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1414 | ret = set_sig_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1415 | rcf->callSignalAddress.item, |
1416 | rcf->callSignalAddress.count); | |
1417 | if (ret < 0) | |
1418 | return -1; | |
1419 | } | |
1420 | ||
1421 | if (rcf->options & eRegistrationConfirm_timeToLive) { | |
0d53778e | 1422 | pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); |
f587de0e PM |
1423 | info->timeout = rcf->timeToLive; |
1424 | } | |
1425 | ||
1426 | if (info->timeout > 0) { | |
0d53778e PM |
1427 | pr_debug("nf_ct_ras: set RAS connection timeout to " |
1428 | "%u seconds\n", info->timeout); | |
3db05fea | 1429 | nf_ct_refresh(ct, skb, info->timeout * HZ); |
f587de0e PM |
1430 | |
1431 | /* Set expect timeout */ | |
f8ba1aff | 1432 | spin_lock_bh(&nf_conntrack_lock); |
f587de0e PM |
1433 | exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, |
1434 | info->sig_port[!dir]); | |
1435 | if (exp) { | |
0d53778e PM |
1436 | pr_debug("nf_ct_ras: set Q.931 expect " |
1437 | "timeout to %u seconds for", | |
1438 | info->timeout); | |
f587de0e PM |
1439 | NF_CT_DUMP_TUPLE(&exp->tuple); |
1440 | set_expect_timeout(exp, info->timeout); | |
1441 | } | |
f8ba1aff | 1442 | spin_unlock_bh(&nf_conntrack_lock); |
f587de0e PM |
1443 | } |
1444 | ||
1445 | return 0; | |
1446 | } | |
1447 | ||
1448 | /****************************************************************************/ | |
3db05fea | 1449 | static int process_urq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1450 | enum ip_conntrack_info ctinfo, |
1451 | unsigned char **data, UnregistrationRequest *urq) | |
1452 | { | |
1453 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1454 | int dir = CTINFO2DIR(ctinfo); | |
1455 | int ret; | |
1456 | typeof(set_sig_addr_hook) set_sig_addr; | |
1457 | ||
0d53778e | 1458 | pr_debug("nf_ct_ras: URQ\n"); |
f587de0e PM |
1459 | |
1460 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1461 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1462 | ret = set_sig_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1463 | urq->callSignalAddress.item, |
1464 | urq->callSignalAddress.count); | |
1465 | if (ret < 0) | |
1466 | return -1; | |
1467 | } | |
1468 | ||
1469 | /* Clear old expect */ | |
1470 | nf_ct_remove_expectations(ct); | |
1471 | info->sig_port[dir] = 0; | |
1472 | info->sig_port[!dir] = 0; | |
1473 | ||
1474 | /* Give it 30 seconds for UCF or URJ */ | |
3db05fea | 1475 | nf_ct_refresh(ct, skb, 30 * HZ); |
f587de0e PM |
1476 | |
1477 | return 0; | |
1478 | } | |
1479 | ||
1480 | /****************************************************************************/ | |
3db05fea | 1481 | static int process_arq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1482 | enum ip_conntrack_info ctinfo, |
1483 | unsigned char **data, AdmissionRequest *arq) | |
1484 | { | |
905e3e8e | 1485 | const struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
f587de0e PM |
1486 | int dir = CTINFO2DIR(ctinfo); |
1487 | __be16 port; | |
643a2c15 | 1488 | union nf_inet_addr addr; |
f587de0e PM |
1489 | typeof(set_h225_addr_hook) set_h225_addr; |
1490 | ||
0d53778e | 1491 | pr_debug("nf_ct_ras: ARQ\n"); |
f587de0e PM |
1492 | |
1493 | set_h225_addr = rcu_dereference(set_h225_addr_hook); | |
1494 | if ((arq->options & eAdmissionRequest_destCallSignalAddress) && | |
1495 | get_h225_addr(ct, *data, &arq->destCallSignalAddress, | |
601e68e1 | 1496 | &addr, &port) && |
f587de0e PM |
1497 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
1498 | port == info->sig_port[dir] && | |
1499 | set_h225_addr && ct->status & IPS_NAT_MASK) { | |
1500 | /* Answering ARQ */ | |
3db05fea | 1501 | return set_h225_addr(skb, data, 0, |
f587de0e PM |
1502 | &arq->destCallSignalAddress, |
1503 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1504 | info->sig_port[!dir]); | |
1505 | } | |
1506 | ||
1507 | if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && | |
1508 | get_h225_addr(ct, *data, &arq->srcCallSignalAddress, | |
601e68e1 | 1509 | &addr, &port) && |
f587de0e PM |
1510 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
1511 | set_h225_addr && ct->status & IPS_NAT_MASK) { | |
1512 | /* Calling ARQ */ | |
3db05fea | 1513 | return set_h225_addr(skb, data, 0, |
f587de0e PM |
1514 | &arq->srcCallSignalAddress, |
1515 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1516 | port); | |
1517 | } | |
1518 | ||
1519 | return 0; | |
1520 | } | |
1521 | ||
1522 | /****************************************************************************/ | |
3db05fea | 1523 | static int process_acf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1524 | enum ip_conntrack_info ctinfo, |
1525 | unsigned char **data, AdmissionConfirm *acf) | |
1526 | { | |
1527 | int dir = CTINFO2DIR(ctinfo); | |
1528 | int ret = 0; | |
1529 | __be16 port; | |
643a2c15 | 1530 | union nf_inet_addr addr; |
f587de0e PM |
1531 | struct nf_conntrack_expect *exp; |
1532 | typeof(set_sig_addr_hook) set_sig_addr; | |
1533 | ||
0d53778e | 1534 | pr_debug("nf_ct_ras: ACF\n"); |
f587de0e PM |
1535 | |
1536 | if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, | |
1537 | &addr, &port)) | |
1538 | return 0; | |
1539 | ||
1540 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { | |
1541 | /* Answering ACF */ | |
1542 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1543 | if (set_sig_addr && ct->status & IPS_NAT_MASK) | |
3db05fea | 1544 | return set_sig_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1545 | &acf->destCallSignalAddress, 1); |
1546 | return 0; | |
1547 | } | |
1548 | ||
1549 | /* Need new expect */ | |
6823645d | 1550 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1551 | return -1; |
6002f266 PM |
1552 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, |
1553 | ct->tuplehash[!dir].tuple.src.l3num, | |
6823645d PM |
1554 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1555 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1556 | exp->flags = NF_CT_EXPECT_PERMANENT; |
1557 | exp->helper = nf_conntrack_helper_q931; | |
1558 | ||
6823645d | 1559 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1560 | pr_debug("nf_ct_ras: expect Q.931 "); |
f587de0e PM |
1561 | NF_CT_DUMP_TUPLE(&exp->tuple); |
1562 | } else | |
1563 | ret = -1; | |
1564 | ||
6823645d | 1565 | nf_ct_expect_put(exp); |
f587de0e PM |
1566 | |
1567 | return ret; | |
1568 | } | |
1569 | ||
1570 | /****************************************************************************/ | |
3db05fea | 1571 | static int process_lrq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1572 | enum ip_conntrack_info ctinfo, |
1573 | unsigned char **data, LocationRequest *lrq) | |
1574 | { | |
1575 | typeof(set_ras_addr_hook) set_ras_addr; | |
1576 | ||
0d53778e | 1577 | pr_debug("nf_ct_ras: LRQ\n"); |
f587de0e PM |
1578 | |
1579 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1580 | if (set_ras_addr && ct->status & IPS_NAT_MASK) | |
3db05fea | 1581 | return set_ras_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1582 | &lrq->replyAddress, 1); |
1583 | return 0; | |
1584 | } | |
1585 | ||
1586 | /****************************************************************************/ | |
3db05fea | 1587 | static int process_lcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1588 | enum ip_conntrack_info ctinfo, |
1589 | unsigned char **data, LocationConfirm *lcf) | |
1590 | { | |
1591 | int dir = CTINFO2DIR(ctinfo); | |
1592 | int ret = 0; | |
1593 | __be16 port; | |
643a2c15 | 1594 | union nf_inet_addr addr; |
f587de0e PM |
1595 | struct nf_conntrack_expect *exp; |
1596 | ||
0d53778e | 1597 | pr_debug("nf_ct_ras: LCF\n"); |
f587de0e PM |
1598 | |
1599 | if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, | |
1600 | &addr, &port)) | |
1601 | return 0; | |
1602 | ||
1603 | /* Need new expect for call signal */ | |
6823645d | 1604 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1605 | return -1; |
6002f266 PM |
1606 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, |
1607 | ct->tuplehash[!dir].tuple.src.l3num, | |
6823645d PM |
1608 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1609 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1610 | exp->flags = NF_CT_EXPECT_PERMANENT; |
1611 | exp->helper = nf_conntrack_helper_q931; | |
1612 | ||
6823645d | 1613 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1614 | pr_debug("nf_ct_ras: expect Q.931 "); |
f587de0e PM |
1615 | NF_CT_DUMP_TUPLE(&exp->tuple); |
1616 | } else | |
1617 | ret = -1; | |
1618 | ||
6823645d | 1619 | nf_ct_expect_put(exp); |
f587de0e PM |
1620 | |
1621 | /* Ignore rasAddress */ | |
1622 | ||
1623 | return ret; | |
1624 | } | |
1625 | ||
1626 | /****************************************************************************/ | |
3db05fea | 1627 | static int process_irr(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1628 | enum ip_conntrack_info ctinfo, |
1629 | unsigned char **data, InfoRequestResponse *irr) | |
1630 | { | |
1631 | int ret; | |
1632 | typeof(set_ras_addr_hook) set_ras_addr; | |
1633 | typeof(set_sig_addr_hook) set_sig_addr; | |
1634 | ||
0d53778e | 1635 | pr_debug("nf_ct_ras: IRR\n"); |
f587de0e PM |
1636 | |
1637 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1638 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1639 | ret = set_ras_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1640 | &irr->rasAddress, 1); |
1641 | if (ret < 0) | |
1642 | return -1; | |
1643 | } | |
1644 | ||
1645 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1646 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1647 | ret = set_sig_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1648 | irr->callSignalAddress.item, |
1649 | irr->callSignalAddress.count); | |
1650 | if (ret < 0) | |
1651 | return -1; | |
1652 | } | |
1653 | ||
1654 | return 0; | |
1655 | } | |
1656 | ||
1657 | /****************************************************************************/ | |
3db05fea | 1658 | static int process_ras(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1659 | enum ip_conntrack_info ctinfo, |
1660 | unsigned char **data, RasMessage *ras) | |
1661 | { | |
1662 | switch (ras->choice) { | |
1663 | case eRasMessage_gatekeeperRequest: | |
3db05fea | 1664 | return process_grq(skb, ct, ctinfo, data, |
f587de0e PM |
1665 | &ras->gatekeeperRequest); |
1666 | case eRasMessage_gatekeeperConfirm: | |
3db05fea | 1667 | return process_gcf(skb, ct, ctinfo, data, |
f587de0e PM |
1668 | &ras->gatekeeperConfirm); |
1669 | case eRasMessage_registrationRequest: | |
3db05fea | 1670 | return process_rrq(skb, ct, ctinfo, data, |
f587de0e PM |
1671 | &ras->registrationRequest); |
1672 | case eRasMessage_registrationConfirm: | |
3db05fea | 1673 | return process_rcf(skb, ct, ctinfo, data, |
f587de0e PM |
1674 | &ras->registrationConfirm); |
1675 | case eRasMessage_unregistrationRequest: | |
3db05fea | 1676 | return process_urq(skb, ct, ctinfo, data, |
f587de0e PM |
1677 | &ras->unregistrationRequest); |
1678 | case eRasMessage_admissionRequest: | |
3db05fea | 1679 | return process_arq(skb, ct, ctinfo, data, |
f587de0e PM |
1680 | &ras->admissionRequest); |
1681 | case eRasMessage_admissionConfirm: | |
3db05fea | 1682 | return process_acf(skb, ct, ctinfo, data, |
f587de0e PM |
1683 | &ras->admissionConfirm); |
1684 | case eRasMessage_locationRequest: | |
3db05fea | 1685 | return process_lrq(skb, ct, ctinfo, data, |
f587de0e PM |
1686 | &ras->locationRequest); |
1687 | case eRasMessage_locationConfirm: | |
3db05fea | 1688 | return process_lcf(skb, ct, ctinfo, data, |
f587de0e PM |
1689 | &ras->locationConfirm); |
1690 | case eRasMessage_infoRequestResponse: | |
3db05fea | 1691 | return process_irr(skb, ct, ctinfo, data, |
f587de0e PM |
1692 | &ras->infoRequestResponse); |
1693 | default: | |
0d53778e | 1694 | pr_debug("nf_ct_ras: RAS message %d\n", ras->choice); |
f587de0e PM |
1695 | break; |
1696 | } | |
1697 | ||
1698 | return 0; | |
1699 | } | |
1700 | ||
1701 | /****************************************************************************/ | |
3db05fea | 1702 | static int ras_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1703 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
1704 | { | |
1705 | static RasMessage ras; | |
1706 | unsigned char *data; | |
1707 | int datalen = 0; | |
1708 | int ret; | |
1709 | ||
3db05fea | 1710 | pr_debug("nf_ct_ras: skblen = %u\n", skb->len); |
f587de0e PM |
1711 | |
1712 | spin_lock_bh(&nf_h323_lock); | |
1713 | ||
1714 | /* Get UDP data */ | |
3db05fea | 1715 | data = get_udp_data(skb, protoff, &datalen); |
f587de0e PM |
1716 | if (data == NULL) |
1717 | goto accept; | |
0d53778e | 1718 | pr_debug("nf_ct_ras: RAS message len=%d ", datalen); |
f587de0e PM |
1719 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
1720 | ||
1721 | /* Decode RAS message */ | |
1722 | ret = DecodeRasMessage(data, datalen, &ras); | |
1723 | if (ret < 0) { | |
0d53778e PM |
1724 | pr_debug("nf_ct_ras: decoding error: %s\n", |
1725 | ret == H323_ERROR_BOUND ? | |
1726 | "out of bound" : "out of range"); | |
f587de0e PM |
1727 | goto accept; |
1728 | } | |
1729 | ||
1730 | /* Process RAS message */ | |
3db05fea | 1731 | if (process_ras(skb, ct, ctinfo, &data, &ras) < 0) |
f587de0e PM |
1732 | goto drop; |
1733 | ||
1734 | accept: | |
1735 | spin_unlock_bh(&nf_h323_lock); | |
1736 | return NF_ACCEPT; | |
1737 | ||
1738 | drop: | |
1739 | spin_unlock_bh(&nf_h323_lock); | |
1740 | if (net_ratelimit()) | |
1741 | printk("nf_ct_ras: packet dropped\n"); | |
1742 | return NF_DROP; | |
1743 | } | |
1744 | ||
1745 | /****************************************************************************/ | |
6002f266 PM |
1746 | static const struct nf_conntrack_expect_policy ras_exp_policy = { |
1747 | .max_expected = 32, | |
1748 | .timeout = 240, | |
1749 | }; | |
1750 | ||
f587de0e PM |
1751 | static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { |
1752 | { | |
1753 | .name = "RAS", | |
1754 | .me = THIS_MODULE, | |
f587de0e PM |
1755 | .tuple.src.l3num = AF_INET, |
1756 | .tuple.src.u.udp.port = __constant_htons(RAS_PORT), | |
1757 | .tuple.dst.protonum = IPPROTO_UDP, | |
f587de0e | 1758 | .help = ras_help, |
6002f266 | 1759 | .expect_policy = &ras_exp_policy, |
f587de0e PM |
1760 | }, |
1761 | { | |
1762 | .name = "RAS", | |
1763 | .me = THIS_MODULE, | |
f587de0e PM |
1764 | .tuple.src.l3num = AF_INET6, |
1765 | .tuple.src.u.udp.port = __constant_htons(RAS_PORT), | |
1766 | .tuple.dst.protonum = IPPROTO_UDP, | |
f587de0e | 1767 | .help = ras_help, |
6002f266 | 1768 | .expect_policy = &ras_exp_policy, |
f587de0e PM |
1769 | }, |
1770 | }; | |
1771 | ||
1772 | /****************************************************************************/ | |
1773 | static void __exit nf_conntrack_h323_fini(void) | |
1774 | { | |
1775 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]); | |
1776 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); | |
1777 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); | |
1778 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); | |
1779 | kfree(h323_buffer); | |
0d53778e | 1780 | pr_debug("nf_ct_h323: fini\n"); |
f587de0e PM |
1781 | } |
1782 | ||
1783 | /****************************************************************************/ | |
1784 | static int __init nf_conntrack_h323_init(void) | |
1785 | { | |
1786 | int ret; | |
1787 | ||
1788 | h323_buffer = kmalloc(65536, GFP_KERNEL); | |
1789 | if (!h323_buffer) | |
1790 | return -ENOMEM; | |
1791 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]); | |
1792 | if (ret < 0) | |
1793 | goto err1; | |
1794 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]); | |
1795 | if (ret < 0) | |
1796 | goto err2; | |
1797 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]); | |
1798 | if (ret < 0) | |
1799 | goto err3; | |
1800 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]); | |
1801 | if (ret < 0) | |
1802 | goto err4; | |
0d53778e | 1803 | pr_debug("nf_ct_h323: init success\n"); |
f587de0e PM |
1804 | return 0; |
1805 | ||
1806 | err4: | |
1807 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); | |
1808 | err3: | |
1809 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); | |
1810 | err2: | |
1811 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); | |
1812 | err1: | |
1813 | return ret; | |
1814 | } | |
1815 | ||
1816 | /****************************************************************************/ | |
1817 | module_init(nf_conntrack_h323_init); | |
1818 | module_exit(nf_conntrack_h323_fini); | |
1819 | ||
1820 | EXPORT_SYMBOL_GPL(get_h225_addr); | |
1821 | EXPORT_SYMBOL_GPL(set_h245_addr_hook); | |
1822 | EXPORT_SYMBOL_GPL(set_h225_addr_hook); | |
1823 | EXPORT_SYMBOL_GPL(set_sig_addr_hook); | |
1824 | EXPORT_SYMBOL_GPL(set_ras_addr_hook); | |
1825 | EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); | |
1826 | EXPORT_SYMBOL_GPL(nat_t120_hook); | |
1827 | EXPORT_SYMBOL_GPL(nat_h245_hook); | |
1828 | EXPORT_SYMBOL_GPL(nat_callforwarding_hook); | |
1829 | EXPORT_SYMBOL_GPL(nat_q931_hook); | |
1830 | ||
1831 | MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); | |
1832 | MODULE_DESCRIPTION("H.323 connection tracking helper"); | |
1833 | MODULE_LICENSE("GPL"); | |
1834 | MODULE_ALIAS("ip_conntrack_h323"); |