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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> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
f587de0e PM |
21 | #include <linux/udp.h> |
22 | #include <linux/tcp.h> | |
23 | #include <linux/skbuff.h> | |
24 | #include <net/route.h> | |
25 | #include <net/ip6_route.h> | |
26 | ||
27 | #include <net/netfilter/nf_conntrack.h> | |
28 | #include <net/netfilter/nf_conntrack_core.h> | |
29 | #include <net/netfilter/nf_conntrack_tuple.h> | |
30 | #include <net/netfilter/nf_conntrack_expect.h> | |
31 | #include <net/netfilter/nf_conntrack_ecache.h> | |
32 | #include <net/netfilter/nf_conntrack_helper.h> | |
5d0aa2cc | 33 | #include <net/netfilter/nf_conntrack_zones.h> |
f587de0e PM |
34 | #include <linux/netfilter/nf_conntrack_h323.h> |
35 | ||
f587de0e PM |
36 | /* Parameters */ |
37 | static unsigned int default_rrq_ttl __read_mostly = 300; | |
38 | module_param(default_rrq_ttl, uint, 0600); | |
39 | MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ"); | |
40 | ||
41 | static int gkrouted_only __read_mostly = 1; | |
42 | module_param(gkrouted_only, int, 0600); | |
43 | MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper"); | |
44 | ||
45 | static int callforward_filter __read_mostly = 1; | |
46 | module_param(callforward_filter, bool, 0600); | |
47 | MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations " | |
601e68e1 | 48 | "if both endpoints are on different sides " |
f587de0e PM |
49 | "(determined by routing information)"); |
50 | ||
51 | /* Hooks for NAT */ | |
3db05fea | 52 | int (*set_h245_addr_hook) (struct sk_buff *skb, |
f587de0e PM |
53 | unsigned char **data, int dataoff, |
54 | H245_TransportAddress *taddr, | |
643a2c15 | 55 | union nf_inet_addr *addr, __be16 port) |
f587de0e | 56 | __read_mostly; |
3db05fea | 57 | int (*set_h225_addr_hook) (struct sk_buff *skb, |
f587de0e PM |
58 | unsigned char **data, int dataoff, |
59 | TransportAddress *taddr, | |
643a2c15 | 60 | union nf_inet_addr *addr, __be16 port) |
f587de0e | 61 | __read_mostly; |
3db05fea | 62 | int (*set_sig_addr_hook) (struct sk_buff *skb, |
f587de0e PM |
63 | struct nf_conn *ct, |
64 | enum ip_conntrack_info ctinfo, | |
65 | unsigned char **data, | |
66 | TransportAddress *taddr, int count) __read_mostly; | |
3db05fea | 67 | int (*set_ras_addr_hook) (struct sk_buff *skb, |
f587de0e PM |
68 | struct nf_conn *ct, |
69 | enum ip_conntrack_info ctinfo, | |
70 | unsigned char **data, | |
71 | TransportAddress *taddr, int count) __read_mostly; | |
3db05fea | 72 | int (*nat_rtp_rtcp_hook) (struct sk_buff *skb, |
f587de0e PM |
73 | struct nf_conn *ct, |
74 | enum ip_conntrack_info ctinfo, | |
75 | unsigned char **data, int dataoff, | |
76 | H245_TransportAddress *taddr, | |
77 | __be16 port, __be16 rtp_port, | |
78 | struct nf_conntrack_expect *rtp_exp, | |
79 | struct nf_conntrack_expect *rtcp_exp) __read_mostly; | |
3db05fea | 80 | int (*nat_t120_hook) (struct sk_buff *skb, |
f587de0e PM |
81 | struct nf_conn *ct, |
82 | enum ip_conntrack_info ctinfo, | |
83 | unsigned char **data, int dataoff, | |
84 | H245_TransportAddress *taddr, __be16 port, | |
85 | struct nf_conntrack_expect *exp) __read_mostly; | |
3db05fea | 86 | int (*nat_h245_hook) (struct sk_buff *skb, |
f587de0e PM |
87 | struct nf_conn *ct, |
88 | enum ip_conntrack_info ctinfo, | |
89 | unsigned char **data, int dataoff, | |
90 | TransportAddress *taddr, __be16 port, | |
91 | struct nf_conntrack_expect *exp) __read_mostly; | |
3db05fea | 92 | int (*nat_callforwarding_hook) (struct sk_buff *skb, |
f587de0e PM |
93 | struct nf_conn *ct, |
94 | enum ip_conntrack_info ctinfo, | |
95 | unsigned char **data, int dataoff, | |
96 | TransportAddress *taddr, __be16 port, | |
97 | struct nf_conntrack_expect *exp) __read_mostly; | |
3db05fea | 98 | int (*nat_q931_hook) (struct sk_buff *skb, |
f587de0e PM |
99 | struct nf_conn *ct, |
100 | enum ip_conntrack_info ctinfo, | |
101 | unsigned char **data, TransportAddress *taddr, int idx, | |
102 | __be16 port, struct nf_conntrack_expect *exp) | |
103 | __read_mostly; | |
104 | ||
105 | static DEFINE_SPINLOCK(nf_h323_lock); | |
106 | static char *h323_buffer; | |
107 | ||
108 | static struct nf_conntrack_helper nf_conntrack_helper_h245; | |
109 | static struct nf_conntrack_helper nf_conntrack_helper_q931[]; | |
110 | static struct nf_conntrack_helper nf_conntrack_helper_ras[]; | |
111 | ||
112 | /****************************************************************************/ | |
3db05fea | 113 | static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
114 | struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
115 | unsigned char **data, int *datalen, int *dataoff) | |
116 | { | |
117 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
118 | int dir = CTINFO2DIR(ctinfo); | |
905e3e8e JE |
119 | const struct tcphdr *th; |
120 | struct tcphdr _tcph; | |
f587de0e PM |
121 | int tcpdatalen; |
122 | int tcpdataoff; | |
123 | unsigned char *tpkt; | |
124 | int tpktlen; | |
125 | int tpktoff; | |
126 | ||
127 | /* Get TCP header */ | |
3db05fea | 128 | th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph); |
f587de0e PM |
129 | if (th == NULL) |
130 | return 0; | |
131 | ||
132 | /* Get TCP data offset */ | |
133 | tcpdataoff = protoff + th->doff * 4; | |
134 | ||
135 | /* Get TCP data length */ | |
3db05fea | 136 | tcpdatalen = skb->len - tcpdataoff; |
f587de0e PM |
137 | if (tcpdatalen <= 0) /* No TCP data */ |
138 | goto clear_out; | |
139 | ||
140 | if (*data == NULL) { /* first TPKT */ | |
141 | /* Get first TPKT pointer */ | |
3db05fea | 142 | tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen, |
f587de0e PM |
143 | h323_buffer); |
144 | BUG_ON(tpkt == NULL); | |
145 | ||
146 | /* Validate TPKT identifier */ | |
147 | if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) { | |
148 | /* Netmeeting sends TPKT header and data separately */ | |
149 | if (info->tpkt_len[dir] > 0) { | |
0d53778e PM |
150 | pr_debug("nf_ct_h323: previous packet " |
151 | "indicated separate TPKT data of %hu " | |
152 | "bytes\n", info->tpkt_len[dir]); | |
f587de0e PM |
153 | if (info->tpkt_len[dir] <= tcpdatalen) { |
154 | /* Yes, there was a TPKT header | |
155 | * received */ | |
156 | *data = tpkt; | |
157 | *datalen = info->tpkt_len[dir]; | |
158 | *dataoff = 0; | |
159 | goto out; | |
160 | } | |
161 | ||
162 | /* Fragmented TPKT */ | |
0d53778e | 163 | pr_debug("nf_ct_h323: fragmented TPKT\n"); |
f587de0e PM |
164 | goto clear_out; |
165 | } | |
166 | ||
167 | /* It is not even a TPKT */ | |
168 | return 0; | |
169 | } | |
170 | tpktoff = 0; | |
171 | } else { /* Next TPKT */ | |
172 | tpktoff = *dataoff + *datalen; | |
173 | tcpdatalen -= tpktoff; | |
174 | if (tcpdatalen <= 4) /* No more TPKT */ | |
175 | goto clear_out; | |
176 | tpkt = *data + *datalen; | |
177 | ||
178 | /* Validate TPKT identifier */ | |
179 | if (tpkt[0] != 0x03 || tpkt[1] != 0) | |
180 | goto clear_out; | |
181 | } | |
182 | ||
183 | /* Validate TPKT length */ | |
184 | tpktlen = tpkt[2] * 256 + tpkt[3]; | |
185 | if (tpktlen < 4) | |
186 | goto clear_out; | |
187 | if (tpktlen > tcpdatalen) { | |
188 | if (tcpdatalen == 4) { /* Separate TPKT header */ | |
189 | /* Netmeeting sends TPKT header and data separately */ | |
0d53778e PM |
190 | pr_debug("nf_ct_h323: separate TPKT header indicates " |
191 | "there will be TPKT data of %hu bytes\n", | |
192 | tpktlen - 4); | |
f587de0e PM |
193 | info->tpkt_len[dir] = tpktlen - 4; |
194 | return 0; | |
195 | } | |
196 | ||
e772c349 | 197 | pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n"); |
f587de0e PM |
198 | goto clear_out; |
199 | } | |
200 | ||
201 | /* This is the encapsulated data */ | |
202 | *data = tpkt + 4; | |
203 | *datalen = tpktlen - 4; | |
204 | *dataoff = tpktoff + 4; | |
205 | ||
206 | out: | |
207 | /* Clear TPKT length */ | |
208 | info->tpkt_len[dir] = 0; | |
209 | return 1; | |
210 | ||
211 | clear_out: | |
212 | info->tpkt_len[dir] = 0; | |
213 | return 0; | |
214 | } | |
215 | ||
216 | /****************************************************************************/ | |
905e3e8e | 217 | static int get_h245_addr(struct nf_conn *ct, const unsigned char *data, |
f587de0e | 218 | H245_TransportAddress *taddr, |
643a2c15 | 219 | union nf_inet_addr *addr, __be16 *port) |
f587de0e | 220 | { |
905e3e8e | 221 | const unsigned char *p; |
f587de0e PM |
222 | int len; |
223 | ||
224 | if (taddr->choice != eH245_TransportAddress_unicastAddress) | |
225 | return 0; | |
226 | ||
227 | switch (taddr->unicastAddress.choice) { | |
228 | case eUnicastAddress_iPAddress: | |
5e8fbe2a | 229 | if (nf_ct_l3num(ct) != AF_INET) |
f587de0e PM |
230 | return 0; |
231 | p = data + taddr->unicastAddress.iPAddress.network; | |
232 | len = 4; | |
233 | break; | |
234 | case eUnicastAddress_iP6Address: | |
5e8fbe2a | 235 | if (nf_ct_l3num(ct) != AF_INET6) |
f587de0e PM |
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; |
5e8fbe2a | 280 | nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
281 | &ct->tuplehash[!dir].tuple.src.u3, |
282 | &ct->tuplehash[!dir].tuple.dst.u3, | |
283 | IPPROTO_UDP, NULL, &rtp_port); | |
f587de0e PM |
284 | |
285 | /* Create expect for RTCP */ | |
6823645d PM |
286 | if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) { |
287 | nf_ct_expect_put(rtp_exp); | |
f587de0e PM |
288 | return -1; |
289 | } | |
5e8fbe2a | 290 | nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
291 | &ct->tuplehash[!dir].tuple.src.u3, |
292 | &ct->tuplehash[!dir].tuple.dst.u3, | |
293 | IPPROTO_UDP, NULL, &rtcp_port); | |
f587de0e PM |
294 | |
295 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
601e68e1 | 296 | &ct->tuplehash[!dir].tuple.dst.u3, |
f587de0e PM |
297 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
298 | (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) && | |
299 | ct->status & IPS_NAT_MASK) { | |
300 | /* NAT needed */ | |
3db05fea | 301 | ret = nat_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
302 | taddr, port, rtp_port, rtp_exp, rtcp_exp); |
303 | } else { /* Conntrack only */ | |
6823645d PM |
304 | if (nf_ct_expect_related(rtp_exp) == 0) { |
305 | if (nf_ct_expect_related(rtcp_exp) == 0) { | |
0d53778e | 306 | pr_debug("nf_ct_h323: expect RTP "); |
3c9fba65 | 307 | nf_ct_dump_tuple(&rtp_exp->tuple); |
0d53778e | 308 | pr_debug("nf_ct_h323: expect RTCP "); |
3c9fba65 | 309 | nf_ct_dump_tuple(&rtcp_exp->tuple); |
f587de0e | 310 | } else { |
6823645d | 311 | nf_ct_unexpect_related(rtp_exp); |
f587de0e PM |
312 | ret = -1; |
313 | } | |
314 | } else | |
315 | ret = -1; | |
316 | } | |
317 | ||
6823645d PM |
318 | nf_ct_expect_put(rtp_exp); |
319 | nf_ct_expect_put(rtcp_exp); | |
f587de0e PM |
320 | |
321 | return ret; | |
322 | } | |
323 | ||
324 | /****************************************************************************/ | |
3db05fea | 325 | static int expect_t120(struct sk_buff *skb, |
f587de0e PM |
326 | struct nf_conn *ct, |
327 | enum ip_conntrack_info ctinfo, | |
328 | unsigned char **data, int dataoff, | |
329 | H245_TransportAddress *taddr) | |
330 | { | |
331 | int dir = CTINFO2DIR(ctinfo); | |
332 | int ret = 0; | |
333 | __be16 port; | |
643a2c15 | 334 | union nf_inet_addr addr; |
f587de0e PM |
335 | struct nf_conntrack_expect *exp; |
336 | typeof(nat_t120_hook) nat_t120; | |
337 | ||
338 | /* Read T.120 address */ | |
339 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || | |
340 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
341 | port == 0) | |
342 | return 0; | |
343 | ||
344 | /* Create expect for T.120 connections */ | |
6823645d | 345 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 346 | return -1; |
5e8fbe2a | 347 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
348 | &ct->tuplehash[!dir].tuple.src.u3, |
349 | &ct->tuplehash[!dir].tuple.dst.u3, | |
350 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
351 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */ |
352 | ||
353 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
354 | &ct->tuplehash[!dir].tuple.dst.u3, | |
355 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
356 | (nat_t120 = rcu_dereference(nat_t120_hook)) && | |
357 | ct->status & IPS_NAT_MASK) { | |
358 | /* NAT needed */ | |
3db05fea | 359 | ret = nat_t120(skb, ct, ctinfo, data, dataoff, taddr, |
f587de0e PM |
360 | port, exp); |
361 | } else { /* Conntrack only */ | |
6823645d | 362 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 363 | pr_debug("nf_ct_h323: expect T.120 "); |
3c9fba65 | 364 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
365 | } else |
366 | ret = -1; | |
367 | } | |
368 | ||
6823645d | 369 | nf_ct_expect_put(exp); |
f587de0e PM |
370 | |
371 | return ret; | |
372 | } | |
373 | ||
374 | /****************************************************************************/ | |
3db05fea | 375 | static int process_h245_channel(struct sk_buff *skb, |
f587de0e PM |
376 | struct nf_conn *ct, |
377 | enum ip_conntrack_info ctinfo, | |
378 | unsigned char **data, int dataoff, | |
379 | H2250LogicalChannelParameters *channel) | |
380 | { | |
381 | int ret; | |
382 | ||
383 | if (channel->options & eH2250LogicalChannelParameters_mediaChannel) { | |
384 | /* RTP */ | |
3db05fea | 385 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
386 | &channel->mediaChannel); |
387 | if (ret < 0) | |
388 | return -1; | |
389 | } | |
390 | ||
391 | if (channel-> | |
392 | options & eH2250LogicalChannelParameters_mediaControlChannel) { | |
393 | /* RTCP */ | |
3db05fea | 394 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
395 | &channel->mediaControlChannel); |
396 | if (ret < 0) | |
397 | return -1; | |
398 | } | |
399 | ||
400 | return 0; | |
401 | } | |
402 | ||
403 | /****************************************************************************/ | |
3db05fea | 404 | static int process_olc(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
405 | enum ip_conntrack_info ctinfo, |
406 | unsigned char **data, int dataoff, | |
407 | OpenLogicalChannel *olc) | |
408 | { | |
409 | int ret; | |
410 | ||
0d53778e | 411 | pr_debug("nf_ct_h323: OpenLogicalChannel\n"); |
f587de0e PM |
412 | |
413 | if (olc->forwardLogicalChannelParameters.multiplexParameters.choice == | |
414 | eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters) | |
415 | { | |
3db05fea | 416 | ret = process_h245_channel(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
417 | &olc-> |
418 | forwardLogicalChannelParameters. | |
419 | multiplexParameters. | |
420 | h2250LogicalChannelParameters); | |
421 | if (ret < 0) | |
422 | return -1; | |
423 | } | |
424 | ||
425 | if ((olc->options & | |
426 | eOpenLogicalChannel_reverseLogicalChannelParameters) && | |
427 | (olc->reverseLogicalChannelParameters.options & | |
428 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters) | |
429 | && (olc->reverseLogicalChannelParameters.multiplexParameters. | |
430 | choice == | |
431 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) | |
432 | { | |
433 | ret = | |
3db05fea | 434 | process_h245_channel(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
435 | &olc-> |
436 | reverseLogicalChannelParameters. | |
437 | multiplexParameters. | |
438 | h2250LogicalChannelParameters); | |
439 | if (ret < 0) | |
440 | return -1; | |
441 | } | |
442 | ||
443 | if ((olc->options & eOpenLogicalChannel_separateStack) && | |
444 | olc->forwardLogicalChannelParameters.dataType.choice == | |
445 | eDataType_data && | |
446 | olc->forwardLogicalChannelParameters.dataType.data.application. | |
447 | choice == eDataApplicationCapability_application_t120 && | |
448 | olc->forwardLogicalChannelParameters.dataType.data.application. | |
449 | t120.choice == eDataProtocolCapability_separateLANStack && | |
450 | olc->separateStack.networkAddress.choice == | |
451 | eNetworkAccessParameters_networkAddress_localAreaAddress) { | |
3db05fea | 452 | ret = expect_t120(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
453 | &olc->separateStack.networkAddress. |
454 | localAreaAddress); | |
455 | if (ret < 0) | |
456 | return -1; | |
457 | } | |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
462 | /****************************************************************************/ | |
3db05fea | 463 | static int process_olca(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
464 | enum ip_conntrack_info ctinfo, |
465 | unsigned char **data, int dataoff, | |
466 | OpenLogicalChannelAck *olca) | |
467 | { | |
468 | H2250LogicalChannelAckParameters *ack; | |
469 | int ret; | |
470 | ||
0d53778e | 471 | pr_debug("nf_ct_h323: OpenLogicalChannelAck\n"); |
f587de0e PM |
472 | |
473 | if ((olca->options & | |
474 | eOpenLogicalChannelAck_reverseLogicalChannelParameters) && | |
475 | (olca->reverseLogicalChannelParameters.options & | |
476 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters) | |
477 | && (olca->reverseLogicalChannelParameters.multiplexParameters. | |
478 | choice == | |
479 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) | |
480 | { | |
3db05fea | 481 | ret = process_h245_channel(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
482 | &olca-> |
483 | reverseLogicalChannelParameters. | |
484 | multiplexParameters. | |
485 | h2250LogicalChannelParameters); | |
486 | if (ret < 0) | |
487 | return -1; | |
488 | } | |
489 | ||
490 | if ((olca->options & | |
491 | eOpenLogicalChannelAck_forwardMultiplexAckParameters) && | |
492 | (olca->forwardMultiplexAckParameters.choice == | |
493 | eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters)) | |
494 | { | |
495 | ack = &olca->forwardMultiplexAckParameters. | |
496 | h2250LogicalChannelAckParameters; | |
497 | if (ack->options & | |
498 | eH2250LogicalChannelAckParameters_mediaChannel) { | |
499 | /* RTP */ | |
3db05fea | 500 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
501 | &ack->mediaChannel); |
502 | if (ret < 0) | |
503 | return -1; | |
504 | } | |
505 | ||
506 | if (ack->options & | |
507 | eH2250LogicalChannelAckParameters_mediaControlChannel) { | |
508 | /* RTCP */ | |
3db05fea | 509 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
510 | &ack->mediaControlChannel); |
511 | if (ret < 0) | |
512 | return -1; | |
513 | } | |
514 | } | |
515 | ||
f8f1c08e JMZ |
516 | if ((olca->options & eOpenLogicalChannelAck_separateStack) && |
517 | olca->separateStack.networkAddress.choice == | |
518 | eNetworkAccessParameters_networkAddress_localAreaAddress) { | |
3db05fea | 519 | ret = expect_t120(skb, ct, ctinfo, data, dataoff, |
f8f1c08e JMZ |
520 | &olca->separateStack.networkAddress. |
521 | localAreaAddress); | |
522 | if (ret < 0) | |
523 | return -1; | |
524 | } | |
525 | ||
f587de0e PM |
526 | return 0; |
527 | } | |
528 | ||
529 | /****************************************************************************/ | |
3db05fea | 530 | static int process_h245(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
531 | enum ip_conntrack_info ctinfo, |
532 | unsigned char **data, int dataoff, | |
533 | MultimediaSystemControlMessage *mscm) | |
534 | { | |
535 | switch (mscm->choice) { | |
536 | case eMultimediaSystemControlMessage_request: | |
537 | if (mscm->request.choice == | |
538 | eRequestMessage_openLogicalChannel) { | |
3db05fea | 539 | return process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
540 | &mscm->request.openLogicalChannel); |
541 | } | |
0d53778e PM |
542 | pr_debug("nf_ct_h323: H.245 Request %d\n", |
543 | mscm->request.choice); | |
f587de0e PM |
544 | break; |
545 | case eMultimediaSystemControlMessage_response: | |
546 | if (mscm->response.choice == | |
547 | eResponseMessage_openLogicalChannelAck) { | |
3db05fea | 548 | return process_olca(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
549 | &mscm->response. |
550 | openLogicalChannelAck); | |
551 | } | |
0d53778e PM |
552 | pr_debug("nf_ct_h323: H.245 Response %d\n", |
553 | mscm->response.choice); | |
f587de0e PM |
554 | break; |
555 | default: | |
0d53778e | 556 | pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice); |
f587de0e PM |
557 | break; |
558 | } | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
563 | /****************************************************************************/ | |
3db05fea | 564 | static int h245_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
565 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
566 | { | |
567 | static MultimediaSystemControlMessage mscm; | |
568 | unsigned char *data = NULL; | |
569 | int datalen; | |
570 | int dataoff; | |
571 | int ret; | |
572 | ||
573 | /* Until there's been traffic both ways, don't look in packets. */ | |
574 | if (ctinfo != IP_CT_ESTABLISHED && | |
575 | ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) { | |
576 | return NF_ACCEPT; | |
577 | } | |
3db05fea | 578 | pr_debug("nf_ct_h245: skblen = %u\n", skb->len); |
f587de0e PM |
579 | |
580 | spin_lock_bh(&nf_h323_lock); | |
581 | ||
582 | /* Process each TPKT */ | |
3db05fea | 583 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
f587de0e | 584 | &data, &datalen, &dataoff)) { |
0d53778e | 585 | pr_debug("nf_ct_h245: TPKT len=%d ", datalen); |
3c9fba65 | 586 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
f587de0e PM |
587 | |
588 | /* Decode H.245 signal */ | |
589 | ret = DecodeMultimediaSystemControlMessage(data, datalen, | |
590 | &mscm); | |
591 | if (ret < 0) { | |
0d53778e PM |
592 | pr_debug("nf_ct_h245: decoding error: %s\n", |
593 | ret == H323_ERROR_BOUND ? | |
594 | "out of bound" : "out of range"); | |
f587de0e PM |
595 | /* We don't drop when decoding error */ |
596 | break; | |
597 | } | |
598 | ||
599 | /* Process H.245 signal */ | |
3db05fea | 600 | if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0) |
f587de0e PM |
601 | goto drop; |
602 | } | |
603 | ||
604 | spin_unlock_bh(&nf_h323_lock); | |
605 | return NF_ACCEPT; | |
606 | ||
607 | drop: | |
608 | spin_unlock_bh(&nf_h323_lock); | |
609 | if (net_ratelimit()) | |
654d0fbd | 610 | pr_info("nf_ct_h245: packet dropped\n"); |
f587de0e PM |
611 | return NF_DROP; |
612 | } | |
613 | ||
614 | /****************************************************************************/ | |
6002f266 PM |
615 | static const struct nf_conntrack_expect_policy h245_exp_policy = { |
616 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */, | |
617 | .timeout = 240, | |
618 | }; | |
619 | ||
f587de0e PM |
620 | static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { |
621 | .name = "H.245", | |
622 | .me = THIS_MODULE, | |
a56b8f81 | 623 | .tuple.src.l3num = AF_UNSPEC, |
f587de0e | 624 | .tuple.dst.protonum = IPPROTO_UDP, |
6002f266 PM |
625 | .help = h245_help, |
626 | .expect_policy = &h245_exp_policy, | |
f587de0e PM |
627 | }; |
628 | ||
629 | /****************************************************************************/ | |
630 | int get_h225_addr(struct nf_conn *ct, unsigned char *data, | |
631 | TransportAddress *taddr, | |
643a2c15 | 632 | union nf_inet_addr *addr, __be16 *port) |
f587de0e | 633 | { |
905e3e8e | 634 | const unsigned char *p; |
f587de0e PM |
635 | int len; |
636 | ||
637 | switch (taddr->choice) { | |
638 | case eTransportAddress_ipAddress: | |
5e8fbe2a | 639 | if (nf_ct_l3num(ct) != AF_INET) |
f587de0e PM |
640 | return 0; |
641 | p = data + taddr->ipAddress.ip; | |
642 | len = 4; | |
643 | break; | |
644 | case eTransportAddress_ip6Address: | |
5e8fbe2a | 645 | if (nf_ct_l3num(ct) != AF_INET6) |
f587de0e | 646 | return 0; |
bb807245 | 647 | p = data + taddr->ip6Address.ip; |
f587de0e PM |
648 | len = 16; |
649 | break; | |
650 | default: | |
651 | return 0; | |
652 | } | |
653 | ||
654 | memcpy(addr, p, len); | |
655 | memset((void *)addr + len, 0, sizeof(*addr) - len); | |
656 | memcpy(port, p + len, sizeof(__be16)); | |
657 | ||
658 | return 1; | |
659 | } | |
660 | ||
661 | /****************************************************************************/ | |
3db05fea | 662 | static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
663 | enum ip_conntrack_info ctinfo, |
664 | unsigned char **data, int dataoff, | |
665 | TransportAddress *taddr) | |
666 | { | |
667 | int dir = CTINFO2DIR(ctinfo); | |
668 | int ret = 0; | |
669 | __be16 port; | |
643a2c15 | 670 | union nf_inet_addr addr; |
f587de0e PM |
671 | struct nf_conntrack_expect *exp; |
672 | typeof(nat_h245_hook) nat_h245; | |
673 | ||
674 | /* Read h245Address */ | |
675 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || | |
676 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
677 | port == 0) | |
678 | return 0; | |
679 | ||
680 | /* Create expect for h245 connection */ | |
6823645d | 681 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 682 | return -1; |
5e8fbe2a | 683 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
684 | &ct->tuplehash[!dir].tuple.src.u3, |
685 | &ct->tuplehash[!dir].tuple.dst.u3, | |
686 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
687 | exp->helper = &nf_conntrack_helper_h245; |
688 | ||
689 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
690 | &ct->tuplehash[!dir].tuple.dst.u3, | |
691 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
692 | (nat_h245 = rcu_dereference(nat_h245_hook)) && | |
693 | ct->status & IPS_NAT_MASK) { | |
694 | /* NAT needed */ | |
3db05fea | 695 | ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr, |
f587de0e PM |
696 | port, exp); |
697 | } else { /* Conntrack only */ | |
6823645d | 698 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 699 | pr_debug("nf_ct_q931: expect H.245 "); |
3c9fba65 | 700 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
701 | } else |
702 | ret = -1; | |
703 | } | |
704 | ||
6823645d | 705 | nf_ct_expect_put(exp); |
f587de0e PM |
706 | |
707 | return ret; | |
708 | } | |
709 | ||
710 | /* If the calling party is on the same side of the forward-to party, | |
711 | * we don't need to track the second call */ | |
905e3e8e | 712 | static int callforward_do_filter(const union nf_inet_addr *src, |
76108cea JE |
713 | const union nf_inet_addr *dst, |
714 | u_int8_t family) | |
f587de0e | 715 | { |
1e796fda | 716 | const struct nf_afinfo *afinfo; |
f587de0e PM |
717 | struct flowi fl1, fl2; |
718 | int ret = 0; | |
719 | ||
1841a4c7 PM |
720 | /* rcu_read_lock()ed by nf_hook_slow() */ |
721 | afinfo = nf_get_afinfo(family); | |
722 | if (!afinfo) | |
723 | return 0; | |
724 | ||
f587de0e PM |
725 | memset(&fl1, 0, sizeof(fl1)); |
726 | memset(&fl2, 0, sizeof(fl2)); | |
727 | ||
728 | switch (family) { | |
729 | case AF_INET: { | |
730 | struct rtable *rt1, *rt2; | |
731 | ||
732 | fl1.fl4_dst = src->ip; | |
733 | fl2.fl4_dst = dst->ip; | |
1841a4c7 PM |
734 | if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) { |
735 | if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) { | |
f587de0e PM |
736 | if (rt1->rt_gateway == rt2->rt_gateway && |
737 | rt1->u.dst.dev == rt2->u.dst.dev) | |
738 | ret = 1; | |
739 | dst_release(&rt2->u.dst); | |
740 | } | |
741 | dst_release(&rt1->u.dst); | |
742 | } | |
743 | break; | |
744 | } | |
1841a4c7 PM |
745 | #if defined(CONFIG_NF_CONNTRACK_IPV6) || \ |
746 | defined(CONFIG_NF_CONNTRACK_IPV6_MODULE) | |
f587de0e PM |
747 | case AF_INET6: { |
748 | struct rt6_info *rt1, *rt2; | |
749 | ||
750 | memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst)); | |
751 | memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst)); | |
1841a4c7 PM |
752 | if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) { |
753 | if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) { | |
f587de0e | 754 | if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway, |
601e68e1 | 755 | sizeof(rt1->rt6i_gateway)) && |
f587de0e PM |
756 | rt1->u.dst.dev == rt2->u.dst.dev) |
757 | ret = 1; | |
758 | dst_release(&rt2->u.dst); | |
759 | } | |
760 | dst_release(&rt1->u.dst); | |
761 | } | |
762 | break; | |
763 | } | |
764 | #endif | |
765 | } | |
766 | return ret; | |
767 | ||
768 | } | |
769 | ||
770 | /****************************************************************************/ | |
3db05fea | 771 | static int expect_callforwarding(struct sk_buff *skb, |
f587de0e PM |
772 | struct nf_conn *ct, |
773 | enum ip_conntrack_info ctinfo, | |
774 | unsigned char **data, int dataoff, | |
775 | TransportAddress *taddr) | |
776 | { | |
777 | int dir = CTINFO2DIR(ctinfo); | |
778 | int ret = 0; | |
779 | __be16 port; | |
643a2c15 | 780 | union nf_inet_addr addr; |
f587de0e PM |
781 | struct nf_conntrack_expect *exp; |
782 | typeof(nat_callforwarding_hook) nat_callforwarding; | |
783 | ||
784 | /* Read alternativeAddress */ | |
785 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) | |
786 | return 0; | |
787 | ||
788 | /* If the calling party is on the same side of the forward-to party, | |
789 | * we don't need to track the second call */ | |
790 | if (callforward_filter && | |
791 | callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3, | |
5e8fbe2a | 792 | nf_ct_l3num(ct))) { |
0d53778e | 793 | pr_debug("nf_ct_q931: Call Forwarding not tracked\n"); |
f587de0e PM |
794 | return 0; |
795 | } | |
796 | ||
797 | /* Create expect for the second call leg */ | |
6823645d | 798 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 799 | return -1; |
5e8fbe2a | 800 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
801 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
802 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
803 | exp->helper = nf_conntrack_helper_q931; |
804 | ||
805 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
806 | &ct->tuplehash[!dir].tuple.dst.u3, | |
807 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
808 | (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && | |
809 | ct->status & IPS_NAT_MASK) { | |
810 | /* Need NAT */ | |
3db05fea | 811 | ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
812 | taddr, port, exp); |
813 | } else { /* Conntrack only */ | |
6823645d | 814 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 815 | pr_debug("nf_ct_q931: expect Call Forwarding "); |
3c9fba65 | 816 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
817 | } else |
818 | ret = -1; | |
819 | } | |
820 | ||
6823645d | 821 | nf_ct_expect_put(exp); |
f587de0e PM |
822 | |
823 | return ret; | |
824 | } | |
825 | ||
826 | /****************************************************************************/ | |
3db05fea | 827 | static int process_setup(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
828 | enum ip_conntrack_info ctinfo, |
829 | unsigned char **data, int dataoff, | |
830 | Setup_UUIE *setup) | |
831 | { | |
832 | int dir = CTINFO2DIR(ctinfo); | |
833 | int ret; | |
834 | int i; | |
835 | __be16 port; | |
643a2c15 | 836 | union nf_inet_addr addr; |
f587de0e PM |
837 | typeof(set_h225_addr_hook) set_h225_addr; |
838 | ||
0d53778e | 839 | pr_debug("nf_ct_q931: Setup\n"); |
f587de0e PM |
840 | |
841 | if (setup->options & eSetup_UUIE_h245Address) { | |
3db05fea | 842 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
843 | &setup->h245Address); |
844 | if (ret < 0) | |
845 | return -1; | |
846 | } | |
847 | ||
848 | set_h225_addr = rcu_dereference(set_h225_addr_hook); | |
849 | if ((setup->options & eSetup_UUIE_destCallSignalAddress) && | |
6aebb9b2 | 850 | (set_h225_addr) && ct->status & IPS_NAT_MASK && |
f587de0e | 851 | get_h225_addr(ct, *data, &setup->destCallSignalAddress, |
601e68e1 | 852 | &addr, &port) && |
f587de0e | 853 | memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { |
5b095d98 | 854 | pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
38ff4fa4 | 855 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3, |
0d53778e | 856 | ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port)); |
3db05fea | 857 | ret = set_h225_addr(skb, data, dataoff, |
f587de0e PM |
858 | &setup->destCallSignalAddress, |
859 | &ct->tuplehash[!dir].tuple.src.u3, | |
860 | ct->tuplehash[!dir].tuple.src.u.tcp.port); | |
861 | if (ret < 0) | |
862 | return -1; | |
863 | } | |
864 | ||
865 | if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && | |
866 | (set_h225_addr) && ct->status & IPS_NAT_MASK && | |
867 | get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, | |
601e68e1 | 868 | &addr, &port) && |
f587de0e | 869 | memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { |
5b095d98 | 870 | pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
38ff4fa4 | 871 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3, |
0d53778e | 872 | ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); |
3db05fea | 873 | ret = set_h225_addr(skb, data, dataoff, |
f587de0e PM |
874 | &setup->sourceCallSignalAddress, |
875 | &ct->tuplehash[!dir].tuple.dst.u3, | |
876 | ct->tuplehash[!dir].tuple.dst.u.tcp.port); | |
877 | if (ret < 0) | |
878 | return -1; | |
879 | } | |
880 | ||
881 | if (setup->options & eSetup_UUIE_fastStart) { | |
882 | for (i = 0; i < setup->fastStart.count; i++) { | |
3db05fea | 883 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
884 | &setup->fastStart.item[i]); |
885 | if (ret < 0) | |
886 | return -1; | |
887 | } | |
888 | } | |
889 | ||
890 | return 0; | |
891 | } | |
892 | ||
893 | /****************************************************************************/ | |
3db05fea | 894 | static int process_callproceeding(struct sk_buff *skb, |
f587de0e PM |
895 | struct nf_conn *ct, |
896 | enum ip_conntrack_info ctinfo, | |
897 | unsigned char **data, int dataoff, | |
898 | CallProceeding_UUIE *callproc) | |
899 | { | |
900 | int ret; | |
901 | int i; | |
902 | ||
0d53778e | 903 | pr_debug("nf_ct_q931: CallProceeding\n"); |
f587de0e PM |
904 | |
905 | if (callproc->options & eCallProceeding_UUIE_h245Address) { | |
3db05fea | 906 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
907 | &callproc->h245Address); |
908 | if (ret < 0) | |
909 | return -1; | |
910 | } | |
911 | ||
912 | if (callproc->options & eCallProceeding_UUIE_fastStart) { | |
913 | for (i = 0; i < callproc->fastStart.count; i++) { | |
3db05fea | 914 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
915 | &callproc->fastStart.item[i]); |
916 | if (ret < 0) | |
917 | return -1; | |
918 | } | |
919 | } | |
920 | ||
921 | return 0; | |
922 | } | |
923 | ||
924 | /****************************************************************************/ | |
3db05fea | 925 | static int process_connect(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
926 | enum ip_conntrack_info ctinfo, |
927 | unsigned char **data, int dataoff, | |
928 | Connect_UUIE *connect) | |
929 | { | |
930 | int ret; | |
931 | int i; | |
932 | ||
0d53778e | 933 | pr_debug("nf_ct_q931: Connect\n"); |
f587de0e PM |
934 | |
935 | if (connect->options & eConnect_UUIE_h245Address) { | |
3db05fea | 936 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
937 | &connect->h245Address); |
938 | if (ret < 0) | |
939 | return -1; | |
940 | } | |
941 | ||
942 | if (connect->options & eConnect_UUIE_fastStart) { | |
943 | for (i = 0; i < connect->fastStart.count; i++) { | |
3db05fea | 944 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
945 | &connect->fastStart.item[i]); |
946 | if (ret < 0) | |
947 | return -1; | |
948 | } | |
949 | } | |
950 | ||
951 | return 0; | |
952 | } | |
953 | ||
954 | /****************************************************************************/ | |
3db05fea | 955 | static int process_alerting(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
956 | enum ip_conntrack_info ctinfo, |
957 | unsigned char **data, int dataoff, | |
958 | Alerting_UUIE *alert) | |
959 | { | |
960 | int ret; | |
961 | int i; | |
962 | ||
0d53778e | 963 | pr_debug("nf_ct_q931: Alerting\n"); |
f587de0e PM |
964 | |
965 | if (alert->options & eAlerting_UUIE_h245Address) { | |
3db05fea | 966 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
967 | &alert->h245Address); |
968 | if (ret < 0) | |
969 | return -1; | |
970 | } | |
971 | ||
972 | if (alert->options & eAlerting_UUIE_fastStart) { | |
973 | for (i = 0; i < alert->fastStart.count; i++) { | |
3db05fea | 974 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
975 | &alert->fastStart.item[i]); |
976 | if (ret < 0) | |
977 | return -1; | |
978 | } | |
979 | } | |
980 | ||
981 | return 0; | |
982 | } | |
983 | ||
f587de0e | 984 | /****************************************************************************/ |
3db05fea | 985 | static int process_facility(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
986 | enum ip_conntrack_info ctinfo, |
987 | unsigned char **data, int dataoff, | |
988 | Facility_UUIE *facility) | |
989 | { | |
990 | int ret; | |
991 | int i; | |
992 | ||
0d53778e | 993 | pr_debug("nf_ct_q931: Facility\n"); |
f587de0e PM |
994 | |
995 | if (facility->reason.choice == eFacilityReason_callForwarded) { | |
996 | if (facility->options & eFacility_UUIE_alternativeAddress) | |
3db05fea | 997 | return expect_callforwarding(skb, ct, ctinfo, data, |
f587de0e PM |
998 | dataoff, |
999 | &facility-> | |
1000 | alternativeAddress); | |
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | if (facility->options & eFacility_UUIE_h245Address) { | |
3db05fea | 1005 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1006 | &facility->h245Address); |
1007 | if (ret < 0) | |
1008 | return -1; | |
1009 | } | |
1010 | ||
1011 | if (facility->options & eFacility_UUIE_fastStart) { | |
1012 | for (i = 0; i < facility->fastStart.count; i++) { | |
3db05fea | 1013 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1014 | &facility->fastStart.item[i]); |
1015 | if (ret < 0) | |
1016 | return -1; | |
1017 | } | |
1018 | } | |
1019 | ||
1020 | return 0; | |
1021 | } | |
1022 | ||
1023 | /****************************************************************************/ | |
3db05fea | 1024 | static int process_progress(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1025 | enum ip_conntrack_info ctinfo, |
1026 | unsigned char **data, int dataoff, | |
1027 | Progress_UUIE *progress) | |
1028 | { | |
1029 | int ret; | |
1030 | int i; | |
1031 | ||
0d53778e | 1032 | pr_debug("nf_ct_q931: Progress\n"); |
f587de0e PM |
1033 | |
1034 | if (progress->options & eProgress_UUIE_h245Address) { | |
3db05fea | 1035 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1036 | &progress->h245Address); |
1037 | if (ret < 0) | |
1038 | return -1; | |
1039 | } | |
1040 | ||
1041 | if (progress->options & eProgress_UUIE_fastStart) { | |
1042 | for (i = 0; i < progress->fastStart.count; i++) { | |
3db05fea | 1043 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1044 | &progress->fastStart.item[i]); |
1045 | if (ret < 0) | |
1046 | return -1; | |
1047 | } | |
1048 | } | |
1049 | ||
1050 | return 0; | |
1051 | } | |
1052 | ||
1053 | /****************************************************************************/ | |
3db05fea | 1054 | static int process_q931(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1055 | enum ip_conntrack_info ctinfo, |
1056 | unsigned char **data, int dataoff, Q931 *q931) | |
1057 | { | |
1058 | H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; | |
1059 | int i; | |
1060 | int ret = 0; | |
1061 | ||
1062 | switch (pdu->h323_message_body.choice) { | |
1063 | case eH323_UU_PDU_h323_message_body_setup: | |
3db05fea | 1064 | ret = process_setup(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1065 | &pdu->h323_message_body.setup); |
1066 | break; | |
1067 | case eH323_UU_PDU_h323_message_body_callProceeding: | |
3db05fea | 1068 | ret = process_callproceeding(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1069 | &pdu->h323_message_body. |
1070 | callProceeding); | |
1071 | break; | |
1072 | case eH323_UU_PDU_h323_message_body_connect: | |
3db05fea | 1073 | ret = process_connect(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1074 | &pdu->h323_message_body.connect); |
1075 | break; | |
1076 | case eH323_UU_PDU_h323_message_body_alerting: | |
3db05fea | 1077 | ret = process_alerting(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1078 | &pdu->h323_message_body.alerting); |
1079 | break; | |
f587de0e | 1080 | case eH323_UU_PDU_h323_message_body_facility: |
3db05fea | 1081 | ret = process_facility(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1082 | &pdu->h323_message_body.facility); |
1083 | break; | |
1084 | case eH323_UU_PDU_h323_message_body_progress: | |
3db05fea | 1085 | ret = process_progress(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1086 | &pdu->h323_message_body.progress); |
1087 | break; | |
1088 | default: | |
0d53778e PM |
1089 | pr_debug("nf_ct_q931: Q.931 signal %d\n", |
1090 | pdu->h323_message_body.choice); | |
f587de0e PM |
1091 | break; |
1092 | } | |
1093 | ||
1094 | if (ret < 0) | |
1095 | return -1; | |
1096 | ||
1097 | if (pdu->options & eH323_UU_PDU_h245Control) { | |
1098 | for (i = 0; i < pdu->h245Control.count; i++) { | |
3db05fea | 1099 | ret = process_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1100 | &pdu->h245Control.item[i]); |
1101 | if (ret < 0) | |
1102 | return -1; | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | return 0; | |
1107 | } | |
1108 | ||
1109 | /****************************************************************************/ | |
3db05fea | 1110 | static int q931_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1111 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
1112 | { | |
1113 | static Q931 q931; | |
1114 | unsigned char *data = NULL; | |
1115 | int datalen; | |
1116 | int dataoff; | |
1117 | int ret; | |
1118 | ||
1119 | /* Until there's been traffic both ways, don't look in packets. */ | |
1120 | if (ctinfo != IP_CT_ESTABLISHED && | |
1121 | ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) { | |
1122 | return NF_ACCEPT; | |
1123 | } | |
3db05fea | 1124 | pr_debug("nf_ct_q931: skblen = %u\n", skb->len); |
f587de0e PM |
1125 | |
1126 | spin_lock_bh(&nf_h323_lock); | |
1127 | ||
1128 | /* Process each TPKT */ | |
3db05fea | 1129 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
f587de0e | 1130 | &data, &datalen, &dataoff)) { |
0d53778e | 1131 | pr_debug("nf_ct_q931: TPKT len=%d ", datalen); |
3c9fba65 | 1132 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
f587de0e PM |
1133 | |
1134 | /* Decode Q.931 signal */ | |
1135 | ret = DecodeQ931(data, datalen, &q931); | |
1136 | if (ret < 0) { | |
0d53778e PM |
1137 | pr_debug("nf_ct_q931: decoding error: %s\n", |
1138 | ret == H323_ERROR_BOUND ? | |
1139 | "out of bound" : "out of range"); | |
f587de0e PM |
1140 | /* We don't drop when decoding error */ |
1141 | break; | |
1142 | } | |
1143 | ||
1144 | /* Process Q.931 signal */ | |
3db05fea | 1145 | if (process_q931(skb, ct, ctinfo, &data, dataoff, &q931) < 0) |
f587de0e PM |
1146 | goto drop; |
1147 | } | |
1148 | ||
1149 | spin_unlock_bh(&nf_h323_lock); | |
1150 | return NF_ACCEPT; | |
1151 | ||
1152 | drop: | |
1153 | spin_unlock_bh(&nf_h323_lock); | |
1154 | if (net_ratelimit()) | |
654d0fbd | 1155 | pr_info("nf_ct_q931: packet dropped\n"); |
f587de0e PM |
1156 | return NF_DROP; |
1157 | } | |
1158 | ||
1159 | /****************************************************************************/ | |
6002f266 PM |
1160 | static const struct nf_conntrack_expect_policy q931_exp_policy = { |
1161 | /* T.120 and H.245 */ | |
1162 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, | |
1163 | .timeout = 240, | |
1164 | }; | |
1165 | ||
f587de0e PM |
1166 | static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { |
1167 | { | |
1168 | .name = "Q.931", | |
1169 | .me = THIS_MODULE, | |
f587de0e | 1170 | .tuple.src.l3num = AF_INET, |
09640e63 | 1171 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
f587de0e | 1172 | .tuple.dst.protonum = IPPROTO_TCP, |
6002f266 PM |
1173 | .help = q931_help, |
1174 | .expect_policy = &q931_exp_policy, | |
f587de0e PM |
1175 | }, |
1176 | { | |
1177 | .name = "Q.931", | |
1178 | .me = THIS_MODULE, | |
f587de0e | 1179 | .tuple.src.l3num = AF_INET6, |
09640e63 | 1180 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
f587de0e | 1181 | .tuple.dst.protonum = IPPROTO_TCP, |
6002f266 PM |
1182 | .help = q931_help, |
1183 | .expect_policy = &q931_exp_policy, | |
f587de0e PM |
1184 | }, |
1185 | }; | |
1186 | ||
1187 | /****************************************************************************/ | |
3db05fea | 1188 | static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1189 | int *datalen) |
1190 | { | |
905e3e8e JE |
1191 | const struct udphdr *uh; |
1192 | struct udphdr _uh; | |
f587de0e PM |
1193 | int dataoff; |
1194 | ||
3db05fea | 1195 | uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh); |
f587de0e PM |
1196 | if (uh == NULL) |
1197 | return NULL; | |
1198 | dataoff = protoff + sizeof(_uh); | |
3db05fea | 1199 | if (dataoff >= skb->len) |
f587de0e | 1200 | return NULL; |
3db05fea HX |
1201 | *datalen = skb->len - dataoff; |
1202 | return skb_header_pointer(skb, dataoff, *datalen, h323_buffer); | |
f587de0e PM |
1203 | } |
1204 | ||
1205 | /****************************************************************************/ | |
1206 | static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, | |
643a2c15 | 1207 | union nf_inet_addr *addr, |
f587de0e PM |
1208 | __be16 port) |
1209 | { | |
84541cc1 | 1210 | struct net *net = nf_ct_net(ct); |
f587de0e PM |
1211 | struct nf_conntrack_expect *exp; |
1212 | struct nf_conntrack_tuple tuple; | |
1213 | ||
1214 | memset(&tuple.src.u3, 0, sizeof(tuple.src.u3)); | |
1215 | tuple.src.u.tcp.port = 0; | |
1216 | memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3)); | |
1217 | tuple.dst.u.tcp.port = port; | |
1218 | tuple.dst.protonum = IPPROTO_TCP; | |
1219 | ||
5d0aa2cc | 1220 | exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple); |
f587de0e PM |
1221 | if (exp && exp->master == ct) |
1222 | return exp; | |
1223 | return NULL; | |
1224 | } | |
1225 | ||
1226 | /****************************************************************************/ | |
1227 | static int set_expect_timeout(struct nf_conntrack_expect *exp, | |
1228 | unsigned timeout) | |
1229 | { | |
1230 | if (!exp || !del_timer(&exp->timeout)) | |
1231 | return 0; | |
1232 | ||
1233 | exp->timeout.expires = jiffies + timeout * HZ; | |
1234 | add_timer(&exp->timeout); | |
1235 | ||
1236 | return 1; | |
1237 | } | |
1238 | ||
1239 | /****************************************************************************/ | |
3db05fea | 1240 | static int expect_q931(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1241 | enum ip_conntrack_info ctinfo, |
1242 | unsigned char **data, | |
1243 | TransportAddress *taddr, int count) | |
1244 | { | |
1245 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1246 | int dir = CTINFO2DIR(ctinfo); | |
1247 | int ret = 0; | |
1248 | int i; | |
1249 | __be16 port; | |
643a2c15 | 1250 | union nf_inet_addr addr; |
f587de0e PM |
1251 | struct nf_conntrack_expect *exp; |
1252 | typeof(nat_q931_hook) nat_q931; | |
1253 | ||
1254 | /* Look for the first related address */ | |
1255 | for (i = 0; i < count; i++) { | |
1256 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && | |
1257 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, | |
601e68e1 | 1258 | sizeof(addr)) == 0 && port != 0) |
f587de0e PM |
1259 | break; |
1260 | } | |
1261 | ||
1262 | if (i >= count) /* Not found */ | |
1263 | return 0; | |
1264 | ||
1265 | /* Create expect for Q.931 */ | |
6823645d | 1266 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1267 | return -1; |
5e8fbe2a | 1268 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
1269 | gkrouted_only ? /* only accept calls from GK? */ |
1270 | &ct->tuplehash[!dir].tuple.src.u3 : NULL, | |
1271 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1272 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1273 | exp->helper = nf_conntrack_helper_q931; |
1274 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ | |
1275 | ||
1276 | nat_q931 = rcu_dereference(nat_q931_hook); | |
1277 | if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */ | |
3db05fea | 1278 | ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp); |
f587de0e | 1279 | } else { /* Conntrack only */ |
6823645d | 1280 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1281 | pr_debug("nf_ct_ras: expect Q.931 "); |
3c9fba65 | 1282 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1283 | |
1284 | /* Save port for looking up expect in processing RCF */ | |
1285 | info->sig_port[dir] = port; | |
1286 | } else | |
1287 | ret = -1; | |
1288 | } | |
1289 | ||
6823645d | 1290 | nf_ct_expect_put(exp); |
f587de0e PM |
1291 | |
1292 | return ret; | |
1293 | } | |
1294 | ||
1295 | /****************************************************************************/ | |
3db05fea | 1296 | static int process_grq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1297 | enum ip_conntrack_info ctinfo, |
1298 | unsigned char **data, GatekeeperRequest *grq) | |
1299 | { | |
1300 | typeof(set_ras_addr_hook) set_ras_addr; | |
1301 | ||
0d53778e | 1302 | pr_debug("nf_ct_ras: GRQ\n"); |
f587de0e PM |
1303 | |
1304 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1305 | if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */ | |
3db05fea | 1306 | return set_ras_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1307 | &grq->rasAddress, 1); |
1308 | return 0; | |
1309 | } | |
1310 | ||
1311 | /****************************************************************************/ | |
3db05fea | 1312 | static int process_gcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1313 | enum ip_conntrack_info ctinfo, |
1314 | unsigned char **data, GatekeeperConfirm *gcf) | |
1315 | { | |
1316 | int dir = CTINFO2DIR(ctinfo); | |
1317 | int ret = 0; | |
1318 | __be16 port; | |
643a2c15 | 1319 | union nf_inet_addr addr; |
f587de0e PM |
1320 | struct nf_conntrack_expect *exp; |
1321 | ||
0d53778e | 1322 | pr_debug("nf_ct_ras: GCF\n"); |
f587de0e PM |
1323 | |
1324 | if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) | |
1325 | return 0; | |
1326 | ||
1327 | /* Registration port is the same as discovery port */ | |
1328 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && | |
1329 | port == ct->tuplehash[dir].tuple.src.u.udp.port) | |
1330 | return 0; | |
1331 | ||
1332 | /* Avoid RAS expectation loops. A GCF is never expected. */ | |
1333 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) | |
1334 | return 0; | |
1335 | ||
1336 | /* Need new expect */ | |
6823645d | 1337 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1338 | return -1; |
5e8fbe2a | 1339 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
1340 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1341 | IPPROTO_UDP, NULL, &port); | |
f587de0e PM |
1342 | exp->helper = nf_conntrack_helper_ras; |
1343 | ||
6823645d | 1344 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1345 | pr_debug("nf_ct_ras: expect RAS "); |
3c9fba65 | 1346 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1347 | } else |
1348 | ret = -1; | |
1349 | ||
6823645d | 1350 | nf_ct_expect_put(exp); |
f587de0e PM |
1351 | |
1352 | return ret; | |
1353 | } | |
1354 | ||
1355 | /****************************************************************************/ | |
3db05fea | 1356 | static int process_rrq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1357 | enum ip_conntrack_info ctinfo, |
1358 | unsigned char **data, RegistrationRequest *rrq) | |
1359 | { | |
1360 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1361 | int ret; | |
1362 | typeof(set_ras_addr_hook) set_ras_addr; | |
1363 | ||
0d53778e | 1364 | pr_debug("nf_ct_ras: RRQ\n"); |
f587de0e | 1365 | |
3db05fea | 1366 | ret = expect_q931(skb, ct, ctinfo, data, |
f587de0e PM |
1367 | rrq->callSignalAddress.item, |
1368 | rrq->callSignalAddress.count); | |
1369 | if (ret < 0) | |
1370 | return -1; | |
1371 | ||
1372 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1373 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1374 | ret = set_ras_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1375 | rrq->rasAddress.item, |
1376 | rrq->rasAddress.count); | |
1377 | if (ret < 0) | |
1378 | return -1; | |
1379 | } | |
1380 | ||
1381 | if (rrq->options & eRegistrationRequest_timeToLive) { | |
0d53778e | 1382 | pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); |
f587de0e PM |
1383 | info->timeout = rrq->timeToLive; |
1384 | } else | |
1385 | info->timeout = default_rrq_ttl; | |
1386 | ||
1387 | return 0; | |
1388 | } | |
1389 | ||
1390 | /****************************************************************************/ | |
3db05fea | 1391 | static int process_rcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1392 | enum ip_conntrack_info ctinfo, |
1393 | unsigned char **data, RegistrationConfirm *rcf) | |
1394 | { | |
1395 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1396 | int dir = CTINFO2DIR(ctinfo); | |
1397 | int ret; | |
1398 | struct nf_conntrack_expect *exp; | |
1399 | typeof(set_sig_addr_hook) set_sig_addr; | |
1400 | ||
0d53778e | 1401 | pr_debug("nf_ct_ras: RCF\n"); |
f587de0e PM |
1402 | |
1403 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1404 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1405 | ret = set_sig_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1406 | rcf->callSignalAddress.item, |
1407 | rcf->callSignalAddress.count); | |
1408 | if (ret < 0) | |
1409 | return -1; | |
1410 | } | |
1411 | ||
1412 | if (rcf->options & eRegistrationConfirm_timeToLive) { | |
0d53778e | 1413 | pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); |
f587de0e PM |
1414 | info->timeout = rcf->timeToLive; |
1415 | } | |
1416 | ||
1417 | if (info->timeout > 0) { | |
0d53778e PM |
1418 | pr_debug("nf_ct_ras: set RAS connection timeout to " |
1419 | "%u seconds\n", info->timeout); | |
3db05fea | 1420 | nf_ct_refresh(ct, skb, info->timeout * HZ); |
f587de0e PM |
1421 | |
1422 | /* Set expect timeout */ | |
f8ba1aff | 1423 | spin_lock_bh(&nf_conntrack_lock); |
f587de0e PM |
1424 | exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, |
1425 | info->sig_port[!dir]); | |
1426 | if (exp) { | |
0d53778e PM |
1427 | pr_debug("nf_ct_ras: set Q.931 expect " |
1428 | "timeout to %u seconds for", | |
1429 | info->timeout); | |
3c9fba65 | 1430 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1431 | set_expect_timeout(exp, info->timeout); |
1432 | } | |
f8ba1aff | 1433 | spin_unlock_bh(&nf_conntrack_lock); |
f587de0e PM |
1434 | } |
1435 | ||
1436 | return 0; | |
1437 | } | |
1438 | ||
1439 | /****************************************************************************/ | |
3db05fea | 1440 | static int process_urq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1441 | enum ip_conntrack_info ctinfo, |
1442 | unsigned char **data, UnregistrationRequest *urq) | |
1443 | { | |
1444 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1445 | int dir = CTINFO2DIR(ctinfo); | |
1446 | int ret; | |
1447 | typeof(set_sig_addr_hook) set_sig_addr; | |
1448 | ||
0d53778e | 1449 | pr_debug("nf_ct_ras: URQ\n"); |
f587de0e PM |
1450 | |
1451 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1452 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1453 | ret = set_sig_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1454 | urq->callSignalAddress.item, |
1455 | urq->callSignalAddress.count); | |
1456 | if (ret < 0) | |
1457 | return -1; | |
1458 | } | |
1459 | ||
1460 | /* Clear old expect */ | |
1461 | nf_ct_remove_expectations(ct); | |
1462 | info->sig_port[dir] = 0; | |
1463 | info->sig_port[!dir] = 0; | |
1464 | ||
1465 | /* Give it 30 seconds for UCF or URJ */ | |
3db05fea | 1466 | nf_ct_refresh(ct, skb, 30 * HZ); |
f587de0e PM |
1467 | |
1468 | return 0; | |
1469 | } | |
1470 | ||
1471 | /****************************************************************************/ | |
3db05fea | 1472 | static int process_arq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1473 | enum ip_conntrack_info ctinfo, |
1474 | unsigned char **data, AdmissionRequest *arq) | |
1475 | { | |
905e3e8e | 1476 | const struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
f587de0e PM |
1477 | int dir = CTINFO2DIR(ctinfo); |
1478 | __be16 port; | |
643a2c15 | 1479 | union nf_inet_addr addr; |
f587de0e PM |
1480 | typeof(set_h225_addr_hook) set_h225_addr; |
1481 | ||
0d53778e | 1482 | pr_debug("nf_ct_ras: ARQ\n"); |
f587de0e PM |
1483 | |
1484 | set_h225_addr = rcu_dereference(set_h225_addr_hook); | |
1485 | if ((arq->options & eAdmissionRequest_destCallSignalAddress) && | |
1486 | get_h225_addr(ct, *data, &arq->destCallSignalAddress, | |
601e68e1 | 1487 | &addr, &port) && |
f587de0e PM |
1488 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
1489 | port == info->sig_port[dir] && | |
1490 | set_h225_addr && ct->status & IPS_NAT_MASK) { | |
1491 | /* Answering ARQ */ | |
3db05fea | 1492 | return set_h225_addr(skb, data, 0, |
f587de0e PM |
1493 | &arq->destCallSignalAddress, |
1494 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1495 | info->sig_port[!dir]); | |
1496 | } | |
1497 | ||
1498 | if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && | |
1499 | get_h225_addr(ct, *data, &arq->srcCallSignalAddress, | |
601e68e1 | 1500 | &addr, &port) && |
f587de0e PM |
1501 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
1502 | set_h225_addr && ct->status & IPS_NAT_MASK) { | |
1503 | /* Calling ARQ */ | |
3db05fea | 1504 | return set_h225_addr(skb, data, 0, |
f587de0e PM |
1505 | &arq->srcCallSignalAddress, |
1506 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1507 | port); | |
1508 | } | |
1509 | ||
1510 | return 0; | |
1511 | } | |
1512 | ||
1513 | /****************************************************************************/ | |
3db05fea | 1514 | static int process_acf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1515 | enum ip_conntrack_info ctinfo, |
1516 | unsigned char **data, AdmissionConfirm *acf) | |
1517 | { | |
1518 | int dir = CTINFO2DIR(ctinfo); | |
1519 | int ret = 0; | |
1520 | __be16 port; | |
643a2c15 | 1521 | union nf_inet_addr addr; |
f587de0e PM |
1522 | struct nf_conntrack_expect *exp; |
1523 | typeof(set_sig_addr_hook) set_sig_addr; | |
1524 | ||
0d53778e | 1525 | pr_debug("nf_ct_ras: ACF\n"); |
f587de0e PM |
1526 | |
1527 | if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, | |
1528 | &addr, &port)) | |
1529 | return 0; | |
1530 | ||
1531 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { | |
1532 | /* Answering ACF */ | |
1533 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1534 | if (set_sig_addr && ct->status & IPS_NAT_MASK) | |
3db05fea | 1535 | return set_sig_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1536 | &acf->destCallSignalAddress, 1); |
1537 | return 0; | |
1538 | } | |
1539 | ||
1540 | /* Need new expect */ | |
6823645d | 1541 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1542 | return -1; |
5e8fbe2a | 1543 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
1544 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1545 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1546 | exp->flags = NF_CT_EXPECT_PERMANENT; |
1547 | exp->helper = nf_conntrack_helper_q931; | |
1548 | ||
6823645d | 1549 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1550 | pr_debug("nf_ct_ras: expect Q.931 "); |
3c9fba65 | 1551 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1552 | } else |
1553 | ret = -1; | |
1554 | ||
6823645d | 1555 | nf_ct_expect_put(exp); |
f587de0e PM |
1556 | |
1557 | return ret; | |
1558 | } | |
1559 | ||
1560 | /****************************************************************************/ | |
3db05fea | 1561 | static int process_lrq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1562 | enum ip_conntrack_info ctinfo, |
1563 | unsigned char **data, LocationRequest *lrq) | |
1564 | { | |
1565 | typeof(set_ras_addr_hook) set_ras_addr; | |
1566 | ||
0d53778e | 1567 | pr_debug("nf_ct_ras: LRQ\n"); |
f587de0e PM |
1568 | |
1569 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1570 | if (set_ras_addr && ct->status & IPS_NAT_MASK) | |
3db05fea | 1571 | return set_ras_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1572 | &lrq->replyAddress, 1); |
1573 | return 0; | |
1574 | } | |
1575 | ||
1576 | /****************************************************************************/ | |
3db05fea | 1577 | static int process_lcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1578 | enum ip_conntrack_info ctinfo, |
1579 | unsigned char **data, LocationConfirm *lcf) | |
1580 | { | |
1581 | int dir = CTINFO2DIR(ctinfo); | |
1582 | int ret = 0; | |
1583 | __be16 port; | |
643a2c15 | 1584 | union nf_inet_addr addr; |
f587de0e PM |
1585 | struct nf_conntrack_expect *exp; |
1586 | ||
0d53778e | 1587 | pr_debug("nf_ct_ras: LCF\n"); |
f587de0e PM |
1588 | |
1589 | if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, | |
1590 | &addr, &port)) | |
1591 | return 0; | |
1592 | ||
1593 | /* Need new expect for call signal */ | |
6823645d | 1594 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1595 | return -1; |
5e8fbe2a | 1596 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
1597 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1598 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1599 | exp->flags = NF_CT_EXPECT_PERMANENT; |
1600 | exp->helper = nf_conntrack_helper_q931; | |
1601 | ||
6823645d | 1602 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1603 | pr_debug("nf_ct_ras: expect Q.931 "); |
3c9fba65 | 1604 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1605 | } else |
1606 | ret = -1; | |
1607 | ||
6823645d | 1608 | nf_ct_expect_put(exp); |
f587de0e PM |
1609 | |
1610 | /* Ignore rasAddress */ | |
1611 | ||
1612 | return ret; | |
1613 | } | |
1614 | ||
1615 | /****************************************************************************/ | |
3db05fea | 1616 | static int process_irr(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1617 | enum ip_conntrack_info ctinfo, |
1618 | unsigned char **data, InfoRequestResponse *irr) | |
1619 | { | |
1620 | int ret; | |
1621 | typeof(set_ras_addr_hook) set_ras_addr; | |
1622 | typeof(set_sig_addr_hook) set_sig_addr; | |
1623 | ||
0d53778e | 1624 | pr_debug("nf_ct_ras: IRR\n"); |
f587de0e PM |
1625 | |
1626 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1627 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1628 | ret = set_ras_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1629 | &irr->rasAddress, 1); |
1630 | if (ret < 0) | |
1631 | return -1; | |
1632 | } | |
1633 | ||
1634 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1635 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1636 | ret = set_sig_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1637 | irr->callSignalAddress.item, |
1638 | irr->callSignalAddress.count); | |
1639 | if (ret < 0) | |
1640 | return -1; | |
1641 | } | |
1642 | ||
1643 | return 0; | |
1644 | } | |
1645 | ||
1646 | /****************************************************************************/ | |
3db05fea | 1647 | static int process_ras(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1648 | enum ip_conntrack_info ctinfo, |
1649 | unsigned char **data, RasMessage *ras) | |
1650 | { | |
1651 | switch (ras->choice) { | |
1652 | case eRasMessage_gatekeeperRequest: | |
3db05fea | 1653 | return process_grq(skb, ct, ctinfo, data, |
f587de0e PM |
1654 | &ras->gatekeeperRequest); |
1655 | case eRasMessage_gatekeeperConfirm: | |
3db05fea | 1656 | return process_gcf(skb, ct, ctinfo, data, |
f587de0e PM |
1657 | &ras->gatekeeperConfirm); |
1658 | case eRasMessage_registrationRequest: | |
3db05fea | 1659 | return process_rrq(skb, ct, ctinfo, data, |
f587de0e PM |
1660 | &ras->registrationRequest); |
1661 | case eRasMessage_registrationConfirm: | |
3db05fea | 1662 | return process_rcf(skb, ct, ctinfo, data, |
f587de0e PM |
1663 | &ras->registrationConfirm); |
1664 | case eRasMessage_unregistrationRequest: | |
3db05fea | 1665 | return process_urq(skb, ct, ctinfo, data, |
f587de0e PM |
1666 | &ras->unregistrationRequest); |
1667 | case eRasMessage_admissionRequest: | |
3db05fea | 1668 | return process_arq(skb, ct, ctinfo, data, |
f587de0e PM |
1669 | &ras->admissionRequest); |
1670 | case eRasMessage_admissionConfirm: | |
3db05fea | 1671 | return process_acf(skb, ct, ctinfo, data, |
f587de0e PM |
1672 | &ras->admissionConfirm); |
1673 | case eRasMessage_locationRequest: | |
3db05fea | 1674 | return process_lrq(skb, ct, ctinfo, data, |
f587de0e PM |
1675 | &ras->locationRequest); |
1676 | case eRasMessage_locationConfirm: | |
3db05fea | 1677 | return process_lcf(skb, ct, ctinfo, data, |
f587de0e PM |
1678 | &ras->locationConfirm); |
1679 | case eRasMessage_infoRequestResponse: | |
3db05fea | 1680 | return process_irr(skb, ct, ctinfo, data, |
f587de0e PM |
1681 | &ras->infoRequestResponse); |
1682 | default: | |
0d53778e | 1683 | pr_debug("nf_ct_ras: RAS message %d\n", ras->choice); |
f587de0e PM |
1684 | break; |
1685 | } | |
1686 | ||
1687 | return 0; | |
1688 | } | |
1689 | ||
1690 | /****************************************************************************/ | |
3db05fea | 1691 | static int ras_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1692 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
1693 | { | |
1694 | static RasMessage ras; | |
1695 | unsigned char *data; | |
1696 | int datalen = 0; | |
1697 | int ret; | |
1698 | ||
3db05fea | 1699 | pr_debug("nf_ct_ras: skblen = %u\n", skb->len); |
f587de0e PM |
1700 | |
1701 | spin_lock_bh(&nf_h323_lock); | |
1702 | ||
1703 | /* Get UDP data */ | |
3db05fea | 1704 | data = get_udp_data(skb, protoff, &datalen); |
f587de0e PM |
1705 | if (data == NULL) |
1706 | goto accept; | |
0d53778e | 1707 | pr_debug("nf_ct_ras: RAS message len=%d ", datalen); |
3c9fba65 | 1708 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
f587de0e PM |
1709 | |
1710 | /* Decode RAS message */ | |
1711 | ret = DecodeRasMessage(data, datalen, &ras); | |
1712 | if (ret < 0) { | |
0d53778e PM |
1713 | pr_debug("nf_ct_ras: decoding error: %s\n", |
1714 | ret == H323_ERROR_BOUND ? | |
1715 | "out of bound" : "out of range"); | |
f587de0e PM |
1716 | goto accept; |
1717 | } | |
1718 | ||
1719 | /* Process RAS message */ | |
3db05fea | 1720 | if (process_ras(skb, ct, ctinfo, &data, &ras) < 0) |
f587de0e PM |
1721 | goto drop; |
1722 | ||
1723 | accept: | |
1724 | spin_unlock_bh(&nf_h323_lock); | |
1725 | return NF_ACCEPT; | |
1726 | ||
1727 | drop: | |
1728 | spin_unlock_bh(&nf_h323_lock); | |
1729 | if (net_ratelimit()) | |
654d0fbd | 1730 | pr_info("nf_ct_ras: packet dropped\n"); |
f587de0e PM |
1731 | return NF_DROP; |
1732 | } | |
1733 | ||
1734 | /****************************************************************************/ | |
6002f266 PM |
1735 | static const struct nf_conntrack_expect_policy ras_exp_policy = { |
1736 | .max_expected = 32, | |
1737 | .timeout = 240, | |
1738 | }; | |
1739 | ||
f587de0e PM |
1740 | static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { |
1741 | { | |
1742 | .name = "RAS", | |
1743 | .me = THIS_MODULE, | |
f587de0e | 1744 | .tuple.src.l3num = AF_INET, |
09640e63 | 1745 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
f587de0e | 1746 | .tuple.dst.protonum = IPPROTO_UDP, |
f587de0e | 1747 | .help = ras_help, |
6002f266 | 1748 | .expect_policy = &ras_exp_policy, |
f587de0e PM |
1749 | }, |
1750 | { | |
1751 | .name = "RAS", | |
1752 | .me = THIS_MODULE, | |
f587de0e | 1753 | .tuple.src.l3num = AF_INET6, |
09640e63 | 1754 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
f587de0e | 1755 | .tuple.dst.protonum = IPPROTO_UDP, |
f587de0e | 1756 | .help = ras_help, |
6002f266 | 1757 | .expect_policy = &ras_exp_policy, |
f587de0e PM |
1758 | }, |
1759 | }; | |
1760 | ||
1761 | /****************************************************************************/ | |
1762 | static void __exit nf_conntrack_h323_fini(void) | |
1763 | { | |
1764 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]); | |
1765 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); | |
1766 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); | |
1767 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); | |
a56b8f81 | 1768 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); |
f587de0e | 1769 | kfree(h323_buffer); |
0d53778e | 1770 | pr_debug("nf_ct_h323: fini\n"); |
f587de0e PM |
1771 | } |
1772 | ||
1773 | /****************************************************************************/ | |
1774 | static int __init nf_conntrack_h323_init(void) | |
1775 | { | |
1776 | int ret; | |
1777 | ||
1778 | h323_buffer = kmalloc(65536, GFP_KERNEL); | |
1779 | if (!h323_buffer) | |
1780 | return -ENOMEM; | |
a56b8f81 | 1781 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245); |
f587de0e PM |
1782 | if (ret < 0) |
1783 | goto err1; | |
a56b8f81 | 1784 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]); |
f587de0e PM |
1785 | if (ret < 0) |
1786 | goto err2; | |
a56b8f81 | 1787 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]); |
f587de0e PM |
1788 | if (ret < 0) |
1789 | goto err3; | |
a56b8f81 | 1790 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]); |
f587de0e PM |
1791 | if (ret < 0) |
1792 | goto err4; | |
a56b8f81 PM |
1793 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]); |
1794 | if (ret < 0) | |
1795 | goto err5; | |
0d53778e | 1796 | pr_debug("nf_ct_h323: init success\n"); |
f587de0e PM |
1797 | return 0; |
1798 | ||
a56b8f81 | 1799 | err5: |
f587de0e | 1800 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); |
a56b8f81 | 1801 | err4: |
f587de0e | 1802 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); |
a56b8f81 | 1803 | err3: |
f587de0e | 1804 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); |
a56b8f81 PM |
1805 | err2: |
1806 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); | |
f587de0e | 1807 | err1: |
8a548868 | 1808 | kfree(h323_buffer); |
f587de0e PM |
1809 | return ret; |
1810 | } | |
1811 | ||
1812 | /****************************************************************************/ | |
1813 | module_init(nf_conntrack_h323_init); | |
1814 | module_exit(nf_conntrack_h323_fini); | |
1815 | ||
1816 | EXPORT_SYMBOL_GPL(get_h225_addr); | |
1817 | EXPORT_SYMBOL_GPL(set_h245_addr_hook); | |
1818 | EXPORT_SYMBOL_GPL(set_h225_addr_hook); | |
1819 | EXPORT_SYMBOL_GPL(set_sig_addr_hook); | |
1820 | EXPORT_SYMBOL_GPL(set_ras_addr_hook); | |
1821 | EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); | |
1822 | EXPORT_SYMBOL_GPL(nat_t120_hook); | |
1823 | EXPORT_SYMBOL_GPL(nat_h245_hook); | |
1824 | EXPORT_SYMBOL_GPL(nat_callforwarding_hook); | |
1825 | EXPORT_SYMBOL_GPL(nat_q931_hook); | |
1826 | ||
1827 | MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); | |
1828 | MODULE_DESCRIPTION("H.323 connection tracking helper"); | |
1829 | MODULE_LICENSE("GPL"); | |
1830 | MODULE_ALIAS("ip_conntrack_h323"); | |
4dc06f96 | 1831 | MODULE_ALIAS_NFCT_HELPER("h323"); |