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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. */ | |
fb048833 | 574 | if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) |
f587de0e | 575 | return NF_ACCEPT; |
fb048833 | 576 | |
3db05fea | 577 | pr_debug("nf_ct_h245: skblen = %u\n", skb->len); |
f587de0e PM |
578 | |
579 | spin_lock_bh(&nf_h323_lock); | |
580 | ||
581 | /* Process each TPKT */ | |
3db05fea | 582 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
f587de0e | 583 | &data, &datalen, &dataoff)) { |
0d53778e | 584 | pr_debug("nf_ct_h245: TPKT len=%d ", datalen); |
3c9fba65 | 585 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
f587de0e PM |
586 | |
587 | /* Decode H.245 signal */ | |
588 | ret = DecodeMultimediaSystemControlMessage(data, datalen, | |
589 | &mscm); | |
590 | if (ret < 0) { | |
0d53778e PM |
591 | pr_debug("nf_ct_h245: decoding error: %s\n", |
592 | ret == H323_ERROR_BOUND ? | |
593 | "out of bound" : "out of range"); | |
f587de0e PM |
594 | /* We don't drop when decoding error */ |
595 | break; | |
596 | } | |
597 | ||
598 | /* Process H.245 signal */ | |
3db05fea | 599 | if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0) |
f587de0e PM |
600 | goto drop; |
601 | } | |
602 | ||
603 | spin_unlock_bh(&nf_h323_lock); | |
604 | return NF_ACCEPT; | |
605 | ||
606 | drop: | |
607 | spin_unlock_bh(&nf_h323_lock); | |
608 | if (net_ratelimit()) | |
654d0fbd | 609 | pr_info("nf_ct_h245: packet dropped\n"); |
f587de0e PM |
610 | return NF_DROP; |
611 | } | |
612 | ||
613 | /****************************************************************************/ | |
6002f266 PM |
614 | static const struct nf_conntrack_expect_policy h245_exp_policy = { |
615 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */, | |
616 | .timeout = 240, | |
617 | }; | |
618 | ||
f587de0e PM |
619 | static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { |
620 | .name = "H.245", | |
621 | .me = THIS_MODULE, | |
a56b8f81 | 622 | .tuple.src.l3num = AF_UNSPEC, |
f587de0e | 623 | .tuple.dst.protonum = IPPROTO_UDP, |
6002f266 PM |
624 | .help = h245_help, |
625 | .expect_policy = &h245_exp_policy, | |
f587de0e PM |
626 | }; |
627 | ||
628 | /****************************************************************************/ | |
629 | int get_h225_addr(struct nf_conn *ct, unsigned char *data, | |
630 | TransportAddress *taddr, | |
643a2c15 | 631 | union nf_inet_addr *addr, __be16 *port) |
f587de0e | 632 | { |
905e3e8e | 633 | const unsigned char *p; |
f587de0e PM |
634 | int len; |
635 | ||
636 | switch (taddr->choice) { | |
637 | case eTransportAddress_ipAddress: | |
5e8fbe2a | 638 | if (nf_ct_l3num(ct) != AF_INET) |
f587de0e PM |
639 | return 0; |
640 | p = data + taddr->ipAddress.ip; | |
641 | len = 4; | |
642 | break; | |
643 | case eTransportAddress_ip6Address: | |
5e8fbe2a | 644 | if (nf_ct_l3num(ct) != AF_INET6) |
f587de0e | 645 | return 0; |
bb807245 | 646 | p = data + taddr->ip6Address.ip; |
f587de0e PM |
647 | len = 16; |
648 | break; | |
649 | default: | |
650 | return 0; | |
651 | } | |
652 | ||
653 | memcpy(addr, p, len); | |
654 | memset((void *)addr + len, 0, sizeof(*addr) - len); | |
655 | memcpy(port, p + len, sizeof(__be16)); | |
656 | ||
657 | return 1; | |
658 | } | |
659 | ||
660 | /****************************************************************************/ | |
3db05fea | 661 | static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
662 | enum ip_conntrack_info ctinfo, |
663 | unsigned char **data, int dataoff, | |
664 | TransportAddress *taddr) | |
665 | { | |
666 | int dir = CTINFO2DIR(ctinfo); | |
667 | int ret = 0; | |
668 | __be16 port; | |
643a2c15 | 669 | union nf_inet_addr addr; |
f587de0e PM |
670 | struct nf_conntrack_expect *exp; |
671 | typeof(nat_h245_hook) nat_h245; | |
672 | ||
673 | /* Read h245Address */ | |
674 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || | |
675 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
676 | port == 0) | |
677 | return 0; | |
678 | ||
679 | /* Create expect for h245 connection */ | |
6823645d | 680 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 681 | return -1; |
5e8fbe2a | 682 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
683 | &ct->tuplehash[!dir].tuple.src.u3, |
684 | &ct->tuplehash[!dir].tuple.dst.u3, | |
685 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
686 | exp->helper = &nf_conntrack_helper_h245; |
687 | ||
688 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
689 | &ct->tuplehash[!dir].tuple.dst.u3, | |
690 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
691 | (nat_h245 = rcu_dereference(nat_h245_hook)) && | |
692 | ct->status & IPS_NAT_MASK) { | |
693 | /* NAT needed */ | |
3db05fea | 694 | ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr, |
f587de0e PM |
695 | port, exp); |
696 | } else { /* Conntrack only */ | |
6823645d | 697 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 698 | pr_debug("nf_ct_q931: expect H.245 "); |
3c9fba65 | 699 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
700 | } else |
701 | ret = -1; | |
702 | } | |
703 | ||
6823645d | 704 | nf_ct_expect_put(exp); |
f587de0e PM |
705 | |
706 | return ret; | |
707 | } | |
708 | ||
709 | /* If the calling party is on the same side of the forward-to party, | |
710 | * we don't need to track the second call */ | |
905e3e8e | 711 | static int callforward_do_filter(const union nf_inet_addr *src, |
76108cea JE |
712 | const union nf_inet_addr *dst, |
713 | u_int8_t family) | |
f587de0e | 714 | { |
1e796fda | 715 | const struct nf_afinfo *afinfo; |
f587de0e PM |
716 | int ret = 0; |
717 | ||
1841a4c7 PM |
718 | /* rcu_read_lock()ed by nf_hook_slow() */ |
719 | afinfo = nf_get_afinfo(family); | |
720 | if (!afinfo) | |
721 | return 0; | |
722 | ||
f587de0e PM |
723 | switch (family) { |
724 | case AF_INET: { | |
5a49d0e0 | 725 | struct flowi4 fl1, fl2; |
f587de0e PM |
726 | struct rtable *rt1, *rt2; |
727 | ||
5a49d0e0 DM |
728 | memset(&fl1, 0, sizeof(fl1)); |
729 | fl1.daddr = src->ip; | |
730 | ||
731 | memset(&fl2, 0, sizeof(fl2)); | |
732 | fl2.daddr = dst->ip; | |
31ad3dd6 | 733 | if (!afinfo->route(&init_net, (struct dst_entry **)&rt1, |
0fae2e77 | 734 | flowi4_to_flowi(&fl1), false)) { |
31ad3dd6 | 735 | if (!afinfo->route(&init_net, (struct dst_entry **)&rt2, |
0fae2e77 | 736 | flowi4_to_flowi(&fl2), false)) { |
f587de0e | 737 | if (rt1->rt_gateway == rt2->rt_gateway && |
d8d1f30b | 738 | rt1->dst.dev == rt2->dst.dev) |
f587de0e | 739 | ret = 1; |
d8d1f30b | 740 | dst_release(&rt2->dst); |
f587de0e | 741 | } |
d8d1f30b | 742 | dst_release(&rt1->dst); |
f587de0e PM |
743 | } |
744 | break; | |
745 | } | |
c0cd1156 | 746 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6) |
f587de0e | 747 | case AF_INET6: { |
5a49d0e0 | 748 | struct flowi6 fl1, fl2; |
f587de0e PM |
749 | struct rt6_info *rt1, *rt2; |
750 | ||
5a49d0e0 | 751 | memset(&fl1, 0, sizeof(fl1)); |
4e3fd7a0 | 752 | fl1.daddr = src->in6; |
5a49d0e0 DM |
753 | |
754 | memset(&fl2, 0, sizeof(fl2)); | |
4e3fd7a0 | 755 | fl2.daddr = dst->in6; |
31ad3dd6 | 756 | if (!afinfo->route(&init_net, (struct dst_entry **)&rt1, |
0fae2e77 | 757 | flowi6_to_flowi(&fl1), false)) { |
31ad3dd6 | 758 | if (!afinfo->route(&init_net, (struct dst_entry **)&rt2, |
0fae2e77 | 759 | flowi6_to_flowi(&fl2), false)) { |
f587de0e | 760 | if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway, |
601e68e1 | 761 | sizeof(rt1->rt6i_gateway)) && |
d8d1f30b | 762 | rt1->dst.dev == rt2->dst.dev) |
f587de0e | 763 | ret = 1; |
d8d1f30b | 764 | dst_release(&rt2->dst); |
f587de0e | 765 | } |
d8d1f30b | 766 | dst_release(&rt1->dst); |
f587de0e PM |
767 | } |
768 | break; | |
769 | } | |
770 | #endif | |
771 | } | |
772 | return ret; | |
773 | ||
774 | } | |
775 | ||
776 | /****************************************************************************/ | |
3db05fea | 777 | static int expect_callforwarding(struct sk_buff *skb, |
f587de0e PM |
778 | struct nf_conn *ct, |
779 | enum ip_conntrack_info ctinfo, | |
780 | unsigned char **data, int dataoff, | |
781 | TransportAddress *taddr) | |
782 | { | |
783 | int dir = CTINFO2DIR(ctinfo); | |
784 | int ret = 0; | |
785 | __be16 port; | |
643a2c15 | 786 | union nf_inet_addr addr; |
f587de0e PM |
787 | struct nf_conntrack_expect *exp; |
788 | typeof(nat_callforwarding_hook) nat_callforwarding; | |
789 | ||
790 | /* Read alternativeAddress */ | |
791 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) | |
792 | return 0; | |
793 | ||
794 | /* If the calling party is on the same side of the forward-to party, | |
795 | * we don't need to track the second call */ | |
796 | if (callforward_filter && | |
797 | callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3, | |
5e8fbe2a | 798 | nf_ct_l3num(ct))) { |
0d53778e | 799 | pr_debug("nf_ct_q931: Call Forwarding not tracked\n"); |
f587de0e PM |
800 | return 0; |
801 | } | |
802 | ||
803 | /* Create expect for the second call leg */ | |
6823645d | 804 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 805 | return -1; |
5e8fbe2a | 806 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
807 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
808 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
809 | exp->helper = nf_conntrack_helper_q931; |
810 | ||
811 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
812 | &ct->tuplehash[!dir].tuple.dst.u3, | |
813 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
814 | (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && | |
815 | ct->status & IPS_NAT_MASK) { | |
816 | /* Need NAT */ | |
3db05fea | 817 | ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
818 | taddr, port, exp); |
819 | } else { /* Conntrack only */ | |
6823645d | 820 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 821 | pr_debug("nf_ct_q931: expect Call Forwarding "); |
3c9fba65 | 822 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
823 | } else |
824 | ret = -1; | |
825 | } | |
826 | ||
6823645d | 827 | nf_ct_expect_put(exp); |
f587de0e PM |
828 | |
829 | return ret; | |
830 | } | |
831 | ||
832 | /****************************************************************************/ | |
3db05fea | 833 | static int process_setup(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
834 | enum ip_conntrack_info ctinfo, |
835 | unsigned char **data, int dataoff, | |
836 | Setup_UUIE *setup) | |
837 | { | |
838 | int dir = CTINFO2DIR(ctinfo); | |
839 | int ret; | |
840 | int i; | |
841 | __be16 port; | |
643a2c15 | 842 | union nf_inet_addr addr; |
f587de0e PM |
843 | typeof(set_h225_addr_hook) set_h225_addr; |
844 | ||
0d53778e | 845 | pr_debug("nf_ct_q931: Setup\n"); |
f587de0e PM |
846 | |
847 | if (setup->options & eSetup_UUIE_h245Address) { | |
3db05fea | 848 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
849 | &setup->h245Address); |
850 | if (ret < 0) | |
851 | return -1; | |
852 | } | |
853 | ||
854 | set_h225_addr = rcu_dereference(set_h225_addr_hook); | |
855 | if ((setup->options & eSetup_UUIE_destCallSignalAddress) && | |
6aebb9b2 | 856 | (set_h225_addr) && ct->status & IPS_NAT_MASK && |
f587de0e | 857 | get_h225_addr(ct, *data, &setup->destCallSignalAddress, |
601e68e1 | 858 | &addr, &port) && |
f587de0e | 859 | memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { |
5b095d98 | 860 | pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
38ff4fa4 | 861 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3, |
0d53778e | 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))) { |
5b095d98 | 876 | pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
38ff4fa4 | 877 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3, |
0d53778e | 878 | ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); |
3db05fea | 879 | ret = set_h225_addr(skb, data, dataoff, |
f587de0e PM |
880 | &setup->sourceCallSignalAddress, |
881 | &ct->tuplehash[!dir].tuple.dst.u3, | |
882 | ct->tuplehash[!dir].tuple.dst.u.tcp.port); | |
883 | if (ret < 0) | |
884 | return -1; | |
885 | } | |
886 | ||
887 | if (setup->options & eSetup_UUIE_fastStart) { | |
888 | for (i = 0; i < setup->fastStart.count; i++) { | |
3db05fea | 889 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
890 | &setup->fastStart.item[i]); |
891 | if (ret < 0) | |
892 | return -1; | |
893 | } | |
894 | } | |
895 | ||
896 | return 0; | |
897 | } | |
898 | ||
899 | /****************************************************************************/ | |
3db05fea | 900 | static int process_callproceeding(struct sk_buff *skb, |
f587de0e PM |
901 | struct nf_conn *ct, |
902 | enum ip_conntrack_info ctinfo, | |
903 | unsigned char **data, int dataoff, | |
904 | CallProceeding_UUIE *callproc) | |
905 | { | |
906 | int ret; | |
907 | int i; | |
908 | ||
0d53778e | 909 | pr_debug("nf_ct_q931: CallProceeding\n"); |
f587de0e PM |
910 | |
911 | if (callproc->options & eCallProceeding_UUIE_h245Address) { | |
3db05fea | 912 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
913 | &callproc->h245Address); |
914 | if (ret < 0) | |
915 | return -1; | |
916 | } | |
917 | ||
918 | if (callproc->options & eCallProceeding_UUIE_fastStart) { | |
919 | for (i = 0; i < callproc->fastStart.count; i++) { | |
3db05fea | 920 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
921 | &callproc->fastStart.item[i]); |
922 | if (ret < 0) | |
923 | return -1; | |
924 | } | |
925 | } | |
926 | ||
927 | return 0; | |
928 | } | |
929 | ||
930 | /****************************************************************************/ | |
3db05fea | 931 | static int process_connect(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
932 | enum ip_conntrack_info ctinfo, |
933 | unsigned char **data, int dataoff, | |
934 | Connect_UUIE *connect) | |
935 | { | |
936 | int ret; | |
937 | int i; | |
938 | ||
0d53778e | 939 | pr_debug("nf_ct_q931: Connect\n"); |
f587de0e PM |
940 | |
941 | if (connect->options & eConnect_UUIE_h245Address) { | |
3db05fea | 942 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
943 | &connect->h245Address); |
944 | if (ret < 0) | |
945 | return -1; | |
946 | } | |
947 | ||
948 | if (connect->options & eConnect_UUIE_fastStart) { | |
949 | for (i = 0; i < connect->fastStart.count; i++) { | |
3db05fea | 950 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
951 | &connect->fastStart.item[i]); |
952 | if (ret < 0) | |
953 | return -1; | |
954 | } | |
955 | } | |
956 | ||
957 | return 0; | |
958 | } | |
959 | ||
960 | /****************************************************************************/ | |
3db05fea | 961 | static int process_alerting(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
962 | enum ip_conntrack_info ctinfo, |
963 | unsigned char **data, int dataoff, | |
964 | Alerting_UUIE *alert) | |
965 | { | |
966 | int ret; | |
967 | int i; | |
968 | ||
0d53778e | 969 | pr_debug("nf_ct_q931: Alerting\n"); |
f587de0e PM |
970 | |
971 | if (alert->options & eAlerting_UUIE_h245Address) { | |
3db05fea | 972 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
973 | &alert->h245Address); |
974 | if (ret < 0) | |
975 | return -1; | |
976 | } | |
977 | ||
978 | if (alert->options & eAlerting_UUIE_fastStart) { | |
979 | for (i = 0; i < alert->fastStart.count; i++) { | |
3db05fea | 980 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
981 | &alert->fastStart.item[i]); |
982 | if (ret < 0) | |
983 | return -1; | |
984 | } | |
985 | } | |
986 | ||
987 | return 0; | |
988 | } | |
989 | ||
f587de0e | 990 | /****************************************************************************/ |
3db05fea | 991 | static int process_facility(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
992 | enum ip_conntrack_info ctinfo, |
993 | unsigned char **data, int dataoff, | |
994 | Facility_UUIE *facility) | |
995 | { | |
996 | int ret; | |
997 | int i; | |
998 | ||
0d53778e | 999 | pr_debug("nf_ct_q931: Facility\n"); |
f587de0e PM |
1000 | |
1001 | if (facility->reason.choice == eFacilityReason_callForwarded) { | |
1002 | if (facility->options & eFacility_UUIE_alternativeAddress) | |
3db05fea | 1003 | return expect_callforwarding(skb, ct, ctinfo, data, |
f587de0e PM |
1004 | dataoff, |
1005 | &facility-> | |
1006 | alternativeAddress); | |
1007 | return 0; | |
1008 | } | |
1009 | ||
1010 | if (facility->options & eFacility_UUIE_h245Address) { | |
3db05fea | 1011 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1012 | &facility->h245Address); |
1013 | if (ret < 0) | |
1014 | return -1; | |
1015 | } | |
1016 | ||
1017 | if (facility->options & eFacility_UUIE_fastStart) { | |
1018 | for (i = 0; i < facility->fastStart.count; i++) { | |
3db05fea | 1019 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1020 | &facility->fastStart.item[i]); |
1021 | if (ret < 0) | |
1022 | return -1; | |
1023 | } | |
1024 | } | |
1025 | ||
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | /****************************************************************************/ | |
3db05fea | 1030 | static int process_progress(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1031 | enum ip_conntrack_info ctinfo, |
1032 | unsigned char **data, int dataoff, | |
1033 | Progress_UUIE *progress) | |
1034 | { | |
1035 | int ret; | |
1036 | int i; | |
1037 | ||
0d53778e | 1038 | pr_debug("nf_ct_q931: Progress\n"); |
f587de0e PM |
1039 | |
1040 | if (progress->options & eProgress_UUIE_h245Address) { | |
3db05fea | 1041 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1042 | &progress->h245Address); |
1043 | if (ret < 0) | |
1044 | return -1; | |
1045 | } | |
1046 | ||
1047 | if (progress->options & eProgress_UUIE_fastStart) { | |
1048 | for (i = 0; i < progress->fastStart.count; i++) { | |
3db05fea | 1049 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1050 | &progress->fastStart.item[i]); |
1051 | if (ret < 0) | |
1052 | return -1; | |
1053 | } | |
1054 | } | |
1055 | ||
1056 | return 0; | |
1057 | } | |
1058 | ||
1059 | /****************************************************************************/ | |
3db05fea | 1060 | static int process_q931(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1061 | enum ip_conntrack_info ctinfo, |
1062 | unsigned char **data, int dataoff, Q931 *q931) | |
1063 | { | |
1064 | H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; | |
1065 | int i; | |
1066 | int ret = 0; | |
1067 | ||
1068 | switch (pdu->h323_message_body.choice) { | |
1069 | case eH323_UU_PDU_h323_message_body_setup: | |
3db05fea | 1070 | ret = process_setup(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1071 | &pdu->h323_message_body.setup); |
1072 | break; | |
1073 | case eH323_UU_PDU_h323_message_body_callProceeding: | |
3db05fea | 1074 | ret = process_callproceeding(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1075 | &pdu->h323_message_body. |
1076 | callProceeding); | |
1077 | break; | |
1078 | case eH323_UU_PDU_h323_message_body_connect: | |
3db05fea | 1079 | ret = process_connect(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1080 | &pdu->h323_message_body.connect); |
1081 | break; | |
1082 | case eH323_UU_PDU_h323_message_body_alerting: | |
3db05fea | 1083 | ret = process_alerting(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1084 | &pdu->h323_message_body.alerting); |
1085 | break; | |
f587de0e | 1086 | case eH323_UU_PDU_h323_message_body_facility: |
3db05fea | 1087 | ret = process_facility(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1088 | &pdu->h323_message_body.facility); |
1089 | break; | |
1090 | case eH323_UU_PDU_h323_message_body_progress: | |
3db05fea | 1091 | ret = process_progress(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1092 | &pdu->h323_message_body.progress); |
1093 | break; | |
1094 | default: | |
0d53778e PM |
1095 | pr_debug("nf_ct_q931: Q.931 signal %d\n", |
1096 | pdu->h323_message_body.choice); | |
f587de0e PM |
1097 | break; |
1098 | } | |
1099 | ||
1100 | if (ret < 0) | |
1101 | return -1; | |
1102 | ||
1103 | if (pdu->options & eH323_UU_PDU_h245Control) { | |
1104 | for (i = 0; i < pdu->h245Control.count; i++) { | |
3db05fea | 1105 | ret = process_h245(skb, ct, ctinfo, data, dataoff, |
f587de0e PM |
1106 | &pdu->h245Control.item[i]); |
1107 | if (ret < 0) | |
1108 | return -1; | |
1109 | } | |
1110 | } | |
1111 | ||
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | /****************************************************************************/ | |
3db05fea | 1116 | static int q931_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1117 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
1118 | { | |
1119 | static Q931 q931; | |
1120 | unsigned char *data = NULL; | |
1121 | int datalen; | |
1122 | int dataoff; | |
1123 | int ret; | |
1124 | ||
1125 | /* Until there's been traffic both ways, don't look in packets. */ | |
fb048833 | 1126 | if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) |
f587de0e | 1127 | return NF_ACCEPT; |
fb048833 | 1128 | |
3db05fea | 1129 | pr_debug("nf_ct_q931: skblen = %u\n", skb->len); |
f587de0e PM |
1130 | |
1131 | spin_lock_bh(&nf_h323_lock); | |
1132 | ||
1133 | /* Process each TPKT */ | |
3db05fea | 1134 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
f587de0e | 1135 | &data, &datalen, &dataoff)) { |
0d53778e | 1136 | pr_debug("nf_ct_q931: TPKT len=%d ", datalen); |
3c9fba65 | 1137 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
f587de0e PM |
1138 | |
1139 | /* Decode Q.931 signal */ | |
1140 | ret = DecodeQ931(data, datalen, &q931); | |
1141 | if (ret < 0) { | |
0d53778e PM |
1142 | pr_debug("nf_ct_q931: decoding error: %s\n", |
1143 | ret == H323_ERROR_BOUND ? | |
1144 | "out of bound" : "out of range"); | |
f587de0e PM |
1145 | /* We don't drop when decoding error */ |
1146 | break; | |
1147 | } | |
1148 | ||
1149 | /* Process Q.931 signal */ | |
3db05fea | 1150 | if (process_q931(skb, ct, ctinfo, &data, dataoff, &q931) < 0) |
f587de0e PM |
1151 | goto drop; |
1152 | } | |
1153 | ||
1154 | spin_unlock_bh(&nf_h323_lock); | |
1155 | return NF_ACCEPT; | |
1156 | ||
1157 | drop: | |
1158 | spin_unlock_bh(&nf_h323_lock); | |
1159 | if (net_ratelimit()) | |
654d0fbd | 1160 | pr_info("nf_ct_q931: packet dropped\n"); |
f587de0e PM |
1161 | return NF_DROP; |
1162 | } | |
1163 | ||
1164 | /****************************************************************************/ | |
6002f266 PM |
1165 | static const struct nf_conntrack_expect_policy q931_exp_policy = { |
1166 | /* T.120 and H.245 */ | |
1167 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, | |
1168 | .timeout = 240, | |
1169 | }; | |
1170 | ||
f587de0e PM |
1171 | static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { |
1172 | { | |
1173 | .name = "Q.931", | |
1174 | .me = THIS_MODULE, | |
f587de0e | 1175 | .tuple.src.l3num = AF_INET, |
09640e63 | 1176 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
f587de0e | 1177 | .tuple.dst.protonum = IPPROTO_TCP, |
6002f266 PM |
1178 | .help = q931_help, |
1179 | .expect_policy = &q931_exp_policy, | |
f587de0e PM |
1180 | }, |
1181 | { | |
1182 | .name = "Q.931", | |
1183 | .me = THIS_MODULE, | |
f587de0e | 1184 | .tuple.src.l3num = AF_INET6, |
09640e63 | 1185 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
f587de0e | 1186 | .tuple.dst.protonum = IPPROTO_TCP, |
6002f266 PM |
1187 | .help = q931_help, |
1188 | .expect_policy = &q931_exp_policy, | |
f587de0e PM |
1189 | }, |
1190 | }; | |
1191 | ||
1192 | /****************************************************************************/ | |
3db05fea | 1193 | static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1194 | int *datalen) |
1195 | { | |
905e3e8e JE |
1196 | const struct udphdr *uh; |
1197 | struct udphdr _uh; | |
f587de0e PM |
1198 | int dataoff; |
1199 | ||
3db05fea | 1200 | uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh); |
f587de0e PM |
1201 | if (uh == NULL) |
1202 | return NULL; | |
1203 | dataoff = protoff + sizeof(_uh); | |
3db05fea | 1204 | if (dataoff >= skb->len) |
f587de0e | 1205 | return NULL; |
3db05fea HX |
1206 | *datalen = skb->len - dataoff; |
1207 | return skb_header_pointer(skb, dataoff, *datalen, h323_buffer); | |
f587de0e PM |
1208 | } |
1209 | ||
1210 | /****************************************************************************/ | |
1211 | static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, | |
643a2c15 | 1212 | union nf_inet_addr *addr, |
f587de0e PM |
1213 | __be16 port) |
1214 | { | |
84541cc1 | 1215 | struct net *net = nf_ct_net(ct); |
f587de0e PM |
1216 | struct nf_conntrack_expect *exp; |
1217 | struct nf_conntrack_tuple tuple; | |
1218 | ||
1219 | memset(&tuple.src.u3, 0, sizeof(tuple.src.u3)); | |
1220 | tuple.src.u.tcp.port = 0; | |
1221 | memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3)); | |
1222 | tuple.dst.u.tcp.port = port; | |
1223 | tuple.dst.protonum = IPPROTO_TCP; | |
1224 | ||
5d0aa2cc | 1225 | exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple); |
f587de0e PM |
1226 | if (exp && exp->master == ct) |
1227 | return exp; | |
1228 | return NULL; | |
1229 | } | |
1230 | ||
1231 | /****************************************************************************/ | |
1232 | static int set_expect_timeout(struct nf_conntrack_expect *exp, | |
1233 | unsigned timeout) | |
1234 | { | |
1235 | if (!exp || !del_timer(&exp->timeout)) | |
1236 | return 0; | |
1237 | ||
1238 | exp->timeout.expires = jiffies + timeout * HZ; | |
1239 | add_timer(&exp->timeout); | |
1240 | ||
1241 | return 1; | |
1242 | } | |
1243 | ||
1244 | /****************************************************************************/ | |
3db05fea | 1245 | static int expect_q931(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1246 | enum ip_conntrack_info ctinfo, |
1247 | unsigned char **data, | |
1248 | TransportAddress *taddr, int count) | |
1249 | { | |
1250 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1251 | int dir = CTINFO2DIR(ctinfo); | |
1252 | int ret = 0; | |
1253 | int i; | |
1254 | __be16 port; | |
643a2c15 | 1255 | union nf_inet_addr addr; |
f587de0e PM |
1256 | struct nf_conntrack_expect *exp; |
1257 | typeof(nat_q931_hook) nat_q931; | |
1258 | ||
1259 | /* Look for the first related address */ | |
1260 | for (i = 0; i < count; i++) { | |
1261 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && | |
1262 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, | |
601e68e1 | 1263 | sizeof(addr)) == 0 && port != 0) |
f587de0e PM |
1264 | break; |
1265 | } | |
1266 | ||
1267 | if (i >= count) /* Not found */ | |
1268 | return 0; | |
1269 | ||
1270 | /* Create expect for Q.931 */ | |
6823645d | 1271 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1272 | return -1; |
5e8fbe2a | 1273 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
1274 | gkrouted_only ? /* only accept calls from GK? */ |
1275 | &ct->tuplehash[!dir].tuple.src.u3 : NULL, | |
1276 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1277 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1278 | exp->helper = nf_conntrack_helper_q931; |
1279 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ | |
1280 | ||
1281 | nat_q931 = rcu_dereference(nat_q931_hook); | |
1282 | if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */ | |
3db05fea | 1283 | ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp); |
f587de0e | 1284 | } else { /* Conntrack only */ |
6823645d | 1285 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1286 | pr_debug("nf_ct_ras: expect Q.931 "); |
3c9fba65 | 1287 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1288 | |
1289 | /* Save port for looking up expect in processing RCF */ | |
1290 | info->sig_port[dir] = port; | |
1291 | } else | |
1292 | ret = -1; | |
1293 | } | |
1294 | ||
6823645d | 1295 | nf_ct_expect_put(exp); |
f587de0e PM |
1296 | |
1297 | return ret; | |
1298 | } | |
1299 | ||
1300 | /****************************************************************************/ | |
3db05fea | 1301 | static int process_grq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1302 | enum ip_conntrack_info ctinfo, |
1303 | unsigned char **data, GatekeeperRequest *grq) | |
1304 | { | |
1305 | typeof(set_ras_addr_hook) set_ras_addr; | |
1306 | ||
0d53778e | 1307 | pr_debug("nf_ct_ras: GRQ\n"); |
f587de0e PM |
1308 | |
1309 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1310 | if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */ | |
3db05fea | 1311 | return set_ras_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1312 | &grq->rasAddress, 1); |
1313 | return 0; | |
1314 | } | |
1315 | ||
1316 | /****************************************************************************/ | |
3db05fea | 1317 | static int process_gcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1318 | enum ip_conntrack_info ctinfo, |
1319 | unsigned char **data, GatekeeperConfirm *gcf) | |
1320 | { | |
1321 | int dir = CTINFO2DIR(ctinfo); | |
1322 | int ret = 0; | |
1323 | __be16 port; | |
643a2c15 | 1324 | union nf_inet_addr addr; |
f587de0e PM |
1325 | struct nf_conntrack_expect *exp; |
1326 | ||
0d53778e | 1327 | pr_debug("nf_ct_ras: GCF\n"); |
f587de0e PM |
1328 | |
1329 | if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) | |
1330 | return 0; | |
1331 | ||
1332 | /* Registration port is the same as discovery port */ | |
1333 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && | |
1334 | port == ct->tuplehash[dir].tuple.src.u.udp.port) | |
1335 | return 0; | |
1336 | ||
1337 | /* Avoid RAS expectation loops. A GCF is never expected. */ | |
1338 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) | |
1339 | return 0; | |
1340 | ||
1341 | /* Need new expect */ | |
6823645d | 1342 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1343 | return -1; |
5e8fbe2a | 1344 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
1345 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1346 | IPPROTO_UDP, NULL, &port); | |
f587de0e PM |
1347 | exp->helper = nf_conntrack_helper_ras; |
1348 | ||
6823645d | 1349 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1350 | pr_debug("nf_ct_ras: expect RAS "); |
3c9fba65 | 1351 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1352 | } else |
1353 | ret = -1; | |
1354 | ||
6823645d | 1355 | nf_ct_expect_put(exp); |
f587de0e PM |
1356 | |
1357 | return ret; | |
1358 | } | |
1359 | ||
1360 | /****************************************************************************/ | |
3db05fea | 1361 | static int process_rrq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1362 | enum ip_conntrack_info ctinfo, |
1363 | unsigned char **data, RegistrationRequest *rrq) | |
1364 | { | |
1365 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1366 | int ret; | |
1367 | typeof(set_ras_addr_hook) set_ras_addr; | |
1368 | ||
0d53778e | 1369 | pr_debug("nf_ct_ras: RRQ\n"); |
f587de0e | 1370 | |
3db05fea | 1371 | ret = expect_q931(skb, ct, ctinfo, data, |
f587de0e PM |
1372 | rrq->callSignalAddress.item, |
1373 | rrq->callSignalAddress.count); | |
1374 | if (ret < 0) | |
1375 | return -1; | |
1376 | ||
1377 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1378 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1379 | ret = set_ras_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1380 | rrq->rasAddress.item, |
1381 | rrq->rasAddress.count); | |
1382 | if (ret < 0) | |
1383 | return -1; | |
1384 | } | |
1385 | ||
1386 | if (rrq->options & eRegistrationRequest_timeToLive) { | |
0d53778e | 1387 | pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); |
f587de0e PM |
1388 | info->timeout = rrq->timeToLive; |
1389 | } else | |
1390 | info->timeout = default_rrq_ttl; | |
1391 | ||
1392 | return 0; | |
1393 | } | |
1394 | ||
1395 | /****************************************************************************/ | |
3db05fea | 1396 | static int process_rcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1397 | enum ip_conntrack_info ctinfo, |
1398 | unsigned char **data, RegistrationConfirm *rcf) | |
1399 | { | |
1400 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1401 | int dir = CTINFO2DIR(ctinfo); | |
1402 | int ret; | |
1403 | struct nf_conntrack_expect *exp; | |
1404 | typeof(set_sig_addr_hook) set_sig_addr; | |
1405 | ||
0d53778e | 1406 | pr_debug("nf_ct_ras: RCF\n"); |
f587de0e PM |
1407 | |
1408 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1409 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1410 | ret = set_sig_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1411 | rcf->callSignalAddress.item, |
1412 | rcf->callSignalAddress.count); | |
1413 | if (ret < 0) | |
1414 | return -1; | |
1415 | } | |
1416 | ||
1417 | if (rcf->options & eRegistrationConfirm_timeToLive) { | |
0d53778e | 1418 | pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); |
f587de0e PM |
1419 | info->timeout = rcf->timeToLive; |
1420 | } | |
1421 | ||
1422 | if (info->timeout > 0) { | |
0d53778e PM |
1423 | pr_debug("nf_ct_ras: set RAS connection timeout to " |
1424 | "%u seconds\n", info->timeout); | |
3db05fea | 1425 | nf_ct_refresh(ct, skb, info->timeout * HZ); |
f587de0e PM |
1426 | |
1427 | /* Set expect timeout */ | |
f8ba1aff | 1428 | spin_lock_bh(&nf_conntrack_lock); |
f587de0e PM |
1429 | exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, |
1430 | info->sig_port[!dir]); | |
1431 | if (exp) { | |
0d53778e PM |
1432 | pr_debug("nf_ct_ras: set Q.931 expect " |
1433 | "timeout to %u seconds for", | |
1434 | info->timeout); | |
3c9fba65 | 1435 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1436 | set_expect_timeout(exp, info->timeout); |
1437 | } | |
f8ba1aff | 1438 | spin_unlock_bh(&nf_conntrack_lock); |
f587de0e PM |
1439 | } |
1440 | ||
1441 | return 0; | |
1442 | } | |
1443 | ||
1444 | /****************************************************************************/ | |
3db05fea | 1445 | static int process_urq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1446 | enum ip_conntrack_info ctinfo, |
1447 | unsigned char **data, UnregistrationRequest *urq) | |
1448 | { | |
1449 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; | |
1450 | int dir = CTINFO2DIR(ctinfo); | |
1451 | int ret; | |
1452 | typeof(set_sig_addr_hook) set_sig_addr; | |
1453 | ||
0d53778e | 1454 | pr_debug("nf_ct_ras: URQ\n"); |
f587de0e PM |
1455 | |
1456 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1457 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1458 | ret = set_sig_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1459 | urq->callSignalAddress.item, |
1460 | urq->callSignalAddress.count); | |
1461 | if (ret < 0) | |
1462 | return -1; | |
1463 | } | |
1464 | ||
1465 | /* Clear old expect */ | |
1466 | nf_ct_remove_expectations(ct); | |
1467 | info->sig_port[dir] = 0; | |
1468 | info->sig_port[!dir] = 0; | |
1469 | ||
1470 | /* Give it 30 seconds for UCF or URJ */ | |
3db05fea | 1471 | nf_ct_refresh(ct, skb, 30 * HZ); |
f587de0e PM |
1472 | |
1473 | return 0; | |
1474 | } | |
1475 | ||
1476 | /****************************************************************************/ | |
3db05fea | 1477 | static int process_arq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1478 | enum ip_conntrack_info ctinfo, |
1479 | unsigned char **data, AdmissionRequest *arq) | |
1480 | { | |
905e3e8e | 1481 | const struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
f587de0e PM |
1482 | int dir = CTINFO2DIR(ctinfo); |
1483 | __be16 port; | |
643a2c15 | 1484 | union nf_inet_addr addr; |
f587de0e PM |
1485 | typeof(set_h225_addr_hook) set_h225_addr; |
1486 | ||
0d53778e | 1487 | pr_debug("nf_ct_ras: ARQ\n"); |
f587de0e PM |
1488 | |
1489 | set_h225_addr = rcu_dereference(set_h225_addr_hook); | |
1490 | if ((arq->options & eAdmissionRequest_destCallSignalAddress) && | |
1491 | get_h225_addr(ct, *data, &arq->destCallSignalAddress, | |
601e68e1 | 1492 | &addr, &port) && |
f587de0e PM |
1493 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
1494 | port == info->sig_port[dir] && | |
1495 | set_h225_addr && ct->status & IPS_NAT_MASK) { | |
1496 | /* Answering ARQ */ | |
3db05fea | 1497 | return set_h225_addr(skb, data, 0, |
f587de0e PM |
1498 | &arq->destCallSignalAddress, |
1499 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1500 | info->sig_port[!dir]); | |
1501 | } | |
1502 | ||
1503 | if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && | |
1504 | get_h225_addr(ct, *data, &arq->srcCallSignalAddress, | |
601e68e1 | 1505 | &addr, &port) && |
f587de0e PM |
1506 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
1507 | set_h225_addr && ct->status & IPS_NAT_MASK) { | |
1508 | /* Calling ARQ */ | |
3db05fea | 1509 | return set_h225_addr(skb, data, 0, |
f587de0e PM |
1510 | &arq->srcCallSignalAddress, |
1511 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1512 | port); | |
1513 | } | |
1514 | ||
1515 | return 0; | |
1516 | } | |
1517 | ||
1518 | /****************************************************************************/ | |
3db05fea | 1519 | static int process_acf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1520 | enum ip_conntrack_info ctinfo, |
1521 | unsigned char **data, AdmissionConfirm *acf) | |
1522 | { | |
1523 | int dir = CTINFO2DIR(ctinfo); | |
1524 | int ret = 0; | |
1525 | __be16 port; | |
643a2c15 | 1526 | union nf_inet_addr addr; |
f587de0e PM |
1527 | struct nf_conntrack_expect *exp; |
1528 | typeof(set_sig_addr_hook) set_sig_addr; | |
1529 | ||
0d53778e | 1530 | pr_debug("nf_ct_ras: ACF\n"); |
f587de0e PM |
1531 | |
1532 | if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, | |
1533 | &addr, &port)) | |
1534 | return 0; | |
1535 | ||
1536 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { | |
1537 | /* Answering ACF */ | |
1538 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1539 | if (set_sig_addr && ct->status & IPS_NAT_MASK) | |
3db05fea | 1540 | return set_sig_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1541 | &acf->destCallSignalAddress, 1); |
1542 | return 0; | |
1543 | } | |
1544 | ||
1545 | /* Need new expect */ | |
6823645d | 1546 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1547 | return -1; |
5e8fbe2a | 1548 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
1549 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1550 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1551 | exp->flags = NF_CT_EXPECT_PERMANENT; |
1552 | exp->helper = nf_conntrack_helper_q931; | |
1553 | ||
6823645d | 1554 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1555 | pr_debug("nf_ct_ras: expect Q.931 "); |
3c9fba65 | 1556 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1557 | } else |
1558 | ret = -1; | |
1559 | ||
6823645d | 1560 | nf_ct_expect_put(exp); |
f587de0e PM |
1561 | |
1562 | return ret; | |
1563 | } | |
1564 | ||
1565 | /****************************************************************************/ | |
3db05fea | 1566 | static int process_lrq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1567 | enum ip_conntrack_info ctinfo, |
1568 | unsigned char **data, LocationRequest *lrq) | |
1569 | { | |
1570 | typeof(set_ras_addr_hook) set_ras_addr; | |
1571 | ||
0d53778e | 1572 | pr_debug("nf_ct_ras: LRQ\n"); |
f587de0e PM |
1573 | |
1574 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1575 | if (set_ras_addr && ct->status & IPS_NAT_MASK) | |
3db05fea | 1576 | return set_ras_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1577 | &lrq->replyAddress, 1); |
1578 | return 0; | |
1579 | } | |
1580 | ||
1581 | /****************************************************************************/ | |
3db05fea | 1582 | static int process_lcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1583 | enum ip_conntrack_info ctinfo, |
1584 | unsigned char **data, LocationConfirm *lcf) | |
1585 | { | |
1586 | int dir = CTINFO2DIR(ctinfo); | |
1587 | int ret = 0; | |
1588 | __be16 port; | |
643a2c15 | 1589 | union nf_inet_addr addr; |
f587de0e PM |
1590 | struct nf_conntrack_expect *exp; |
1591 | ||
0d53778e | 1592 | pr_debug("nf_ct_ras: LCF\n"); |
f587de0e PM |
1593 | |
1594 | if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, | |
1595 | &addr, &port)) | |
1596 | return 0; | |
1597 | ||
1598 | /* Need new expect for call signal */ | |
6823645d | 1599 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1600 | return -1; |
5e8fbe2a | 1601 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
1602 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1603 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1604 | exp->flags = NF_CT_EXPECT_PERMANENT; |
1605 | exp->helper = nf_conntrack_helper_q931; | |
1606 | ||
6823645d | 1607 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1608 | pr_debug("nf_ct_ras: expect Q.931 "); |
3c9fba65 | 1609 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1610 | } else |
1611 | ret = -1; | |
1612 | ||
6823645d | 1613 | nf_ct_expect_put(exp); |
f587de0e PM |
1614 | |
1615 | /* Ignore rasAddress */ | |
1616 | ||
1617 | return ret; | |
1618 | } | |
1619 | ||
1620 | /****************************************************************************/ | |
3db05fea | 1621 | static int process_irr(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1622 | enum ip_conntrack_info ctinfo, |
1623 | unsigned char **data, InfoRequestResponse *irr) | |
1624 | { | |
1625 | int ret; | |
1626 | typeof(set_ras_addr_hook) set_ras_addr; | |
1627 | typeof(set_sig_addr_hook) set_sig_addr; | |
1628 | ||
0d53778e | 1629 | pr_debug("nf_ct_ras: IRR\n"); |
f587de0e PM |
1630 | |
1631 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
1632 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1633 | ret = set_ras_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1634 | &irr->rasAddress, 1); |
1635 | if (ret < 0) | |
1636 | return -1; | |
1637 | } | |
1638 | ||
1639 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
1640 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { | |
3db05fea | 1641 | ret = set_sig_addr(skb, ct, ctinfo, data, |
f587de0e PM |
1642 | irr->callSignalAddress.item, |
1643 | irr->callSignalAddress.count); | |
1644 | if (ret < 0) | |
1645 | return -1; | |
1646 | } | |
1647 | ||
1648 | return 0; | |
1649 | } | |
1650 | ||
1651 | /****************************************************************************/ | |
3db05fea | 1652 | static int process_ras(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e PM |
1653 | enum ip_conntrack_info ctinfo, |
1654 | unsigned char **data, RasMessage *ras) | |
1655 | { | |
1656 | switch (ras->choice) { | |
1657 | case eRasMessage_gatekeeperRequest: | |
3db05fea | 1658 | return process_grq(skb, ct, ctinfo, data, |
f587de0e PM |
1659 | &ras->gatekeeperRequest); |
1660 | case eRasMessage_gatekeeperConfirm: | |
3db05fea | 1661 | return process_gcf(skb, ct, ctinfo, data, |
f587de0e PM |
1662 | &ras->gatekeeperConfirm); |
1663 | case eRasMessage_registrationRequest: | |
3db05fea | 1664 | return process_rrq(skb, ct, ctinfo, data, |
f587de0e PM |
1665 | &ras->registrationRequest); |
1666 | case eRasMessage_registrationConfirm: | |
3db05fea | 1667 | return process_rcf(skb, ct, ctinfo, data, |
f587de0e PM |
1668 | &ras->registrationConfirm); |
1669 | case eRasMessage_unregistrationRequest: | |
3db05fea | 1670 | return process_urq(skb, ct, ctinfo, data, |
f587de0e PM |
1671 | &ras->unregistrationRequest); |
1672 | case eRasMessage_admissionRequest: | |
3db05fea | 1673 | return process_arq(skb, ct, ctinfo, data, |
f587de0e PM |
1674 | &ras->admissionRequest); |
1675 | case eRasMessage_admissionConfirm: | |
3db05fea | 1676 | return process_acf(skb, ct, ctinfo, data, |
f587de0e PM |
1677 | &ras->admissionConfirm); |
1678 | case eRasMessage_locationRequest: | |
3db05fea | 1679 | return process_lrq(skb, ct, ctinfo, data, |
f587de0e PM |
1680 | &ras->locationRequest); |
1681 | case eRasMessage_locationConfirm: | |
3db05fea | 1682 | return process_lcf(skb, ct, ctinfo, data, |
f587de0e PM |
1683 | &ras->locationConfirm); |
1684 | case eRasMessage_infoRequestResponse: | |
3db05fea | 1685 | return process_irr(skb, ct, ctinfo, data, |
f587de0e PM |
1686 | &ras->infoRequestResponse); |
1687 | default: | |
0d53778e | 1688 | pr_debug("nf_ct_ras: RAS message %d\n", ras->choice); |
f587de0e PM |
1689 | break; |
1690 | } | |
1691 | ||
1692 | return 0; | |
1693 | } | |
1694 | ||
1695 | /****************************************************************************/ | |
3db05fea | 1696 | static int ras_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1697 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
1698 | { | |
1699 | static RasMessage ras; | |
1700 | unsigned char *data; | |
1701 | int datalen = 0; | |
1702 | int ret; | |
1703 | ||
3db05fea | 1704 | pr_debug("nf_ct_ras: skblen = %u\n", skb->len); |
f587de0e PM |
1705 | |
1706 | spin_lock_bh(&nf_h323_lock); | |
1707 | ||
1708 | /* Get UDP data */ | |
3db05fea | 1709 | data = get_udp_data(skb, protoff, &datalen); |
f587de0e PM |
1710 | if (data == NULL) |
1711 | goto accept; | |
0d53778e | 1712 | pr_debug("nf_ct_ras: RAS message len=%d ", datalen); |
3c9fba65 | 1713 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
f587de0e PM |
1714 | |
1715 | /* Decode RAS message */ | |
1716 | ret = DecodeRasMessage(data, datalen, &ras); | |
1717 | if (ret < 0) { | |
0d53778e PM |
1718 | pr_debug("nf_ct_ras: decoding error: %s\n", |
1719 | ret == H323_ERROR_BOUND ? | |
1720 | "out of bound" : "out of range"); | |
f587de0e PM |
1721 | goto accept; |
1722 | } | |
1723 | ||
1724 | /* Process RAS message */ | |
3db05fea | 1725 | if (process_ras(skb, ct, ctinfo, &data, &ras) < 0) |
f587de0e PM |
1726 | goto drop; |
1727 | ||
1728 | accept: | |
1729 | spin_unlock_bh(&nf_h323_lock); | |
1730 | return NF_ACCEPT; | |
1731 | ||
1732 | drop: | |
1733 | spin_unlock_bh(&nf_h323_lock); | |
1734 | if (net_ratelimit()) | |
654d0fbd | 1735 | pr_info("nf_ct_ras: packet dropped\n"); |
f587de0e PM |
1736 | return NF_DROP; |
1737 | } | |
1738 | ||
1739 | /****************************************************************************/ | |
6002f266 PM |
1740 | static const struct nf_conntrack_expect_policy ras_exp_policy = { |
1741 | .max_expected = 32, | |
1742 | .timeout = 240, | |
1743 | }; | |
1744 | ||
f587de0e PM |
1745 | static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { |
1746 | { | |
1747 | .name = "RAS", | |
1748 | .me = THIS_MODULE, | |
f587de0e | 1749 | .tuple.src.l3num = AF_INET, |
09640e63 | 1750 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
f587de0e | 1751 | .tuple.dst.protonum = IPPROTO_UDP, |
f587de0e | 1752 | .help = ras_help, |
6002f266 | 1753 | .expect_policy = &ras_exp_policy, |
f587de0e PM |
1754 | }, |
1755 | { | |
1756 | .name = "RAS", | |
1757 | .me = THIS_MODULE, | |
f587de0e | 1758 | .tuple.src.l3num = AF_INET6, |
09640e63 | 1759 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
f587de0e | 1760 | .tuple.dst.protonum = IPPROTO_UDP, |
f587de0e | 1761 | .help = ras_help, |
6002f266 | 1762 | .expect_policy = &ras_exp_policy, |
f587de0e PM |
1763 | }, |
1764 | }; | |
1765 | ||
1766 | /****************************************************************************/ | |
1767 | static void __exit nf_conntrack_h323_fini(void) | |
1768 | { | |
1769 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]); | |
1770 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); | |
1771 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); | |
1772 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); | |
a56b8f81 | 1773 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); |
f587de0e | 1774 | kfree(h323_buffer); |
0d53778e | 1775 | pr_debug("nf_ct_h323: fini\n"); |
f587de0e PM |
1776 | } |
1777 | ||
1778 | /****************************************************************************/ | |
1779 | static int __init nf_conntrack_h323_init(void) | |
1780 | { | |
1781 | int ret; | |
1782 | ||
1783 | h323_buffer = kmalloc(65536, GFP_KERNEL); | |
1784 | if (!h323_buffer) | |
1785 | return -ENOMEM; | |
a56b8f81 | 1786 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245); |
f587de0e PM |
1787 | if (ret < 0) |
1788 | goto err1; | |
a56b8f81 | 1789 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]); |
f587de0e PM |
1790 | if (ret < 0) |
1791 | goto err2; | |
a56b8f81 | 1792 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]); |
f587de0e PM |
1793 | if (ret < 0) |
1794 | goto err3; | |
a56b8f81 | 1795 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]); |
f587de0e PM |
1796 | if (ret < 0) |
1797 | goto err4; | |
a56b8f81 PM |
1798 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]); |
1799 | if (ret < 0) | |
1800 | goto err5; | |
0d53778e | 1801 | pr_debug("nf_ct_h323: init success\n"); |
f587de0e PM |
1802 | return 0; |
1803 | ||
a56b8f81 | 1804 | err5: |
f587de0e | 1805 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); |
a56b8f81 | 1806 | err4: |
f587de0e | 1807 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); |
a56b8f81 | 1808 | err3: |
f587de0e | 1809 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); |
a56b8f81 PM |
1810 | err2: |
1811 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); | |
f587de0e | 1812 | err1: |
8a548868 | 1813 | kfree(h323_buffer); |
f587de0e PM |
1814 | return ret; |
1815 | } | |
1816 | ||
1817 | /****************************************************************************/ | |
1818 | module_init(nf_conntrack_h323_init); | |
1819 | module_exit(nf_conntrack_h323_fini); | |
1820 | ||
1821 | EXPORT_SYMBOL_GPL(get_h225_addr); | |
1822 | EXPORT_SYMBOL_GPL(set_h245_addr_hook); | |
1823 | EXPORT_SYMBOL_GPL(set_h225_addr_hook); | |
1824 | EXPORT_SYMBOL_GPL(set_sig_addr_hook); | |
1825 | EXPORT_SYMBOL_GPL(set_ras_addr_hook); | |
1826 | EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); | |
1827 | EXPORT_SYMBOL_GPL(nat_t120_hook); | |
1828 | EXPORT_SYMBOL_GPL(nat_h245_hook); | |
1829 | EXPORT_SYMBOL_GPL(nat_callforwarding_hook); | |
1830 | EXPORT_SYMBOL_GPL(nat_q931_hook); | |
1831 | ||
1832 | MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); | |
1833 | MODULE_DESCRIPTION("H.323 connection tracking helper"); | |
1834 | MODULE_LICENSE("GPL"); | |
1835 | MODULE_ALIAS("ip_conntrack_h323"); | |
4dc06f96 | 1836 | MODULE_ALIAS_NFCT_HELPER("h323"); |