Commit | Line | Data |
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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> | |
f229f6ce | 5 | * Copyright (c) 2006-2012 Patrick McHardy <kaber@trash.net> |
f587de0e PM |
6 | * |
7 | * This source code is licensed under General Public License version 2. | |
8 | * | |
9 | * Based on the 'brute force' H.323 connection tracking module by | |
10 | * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> | |
11 | * | |
12 | * For more information, please see http://nath323.sourceforge.net/ | |
13 | */ | |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/moduleparam.h> | |
17 | #include <linux/ctype.h> | |
18 | #include <linux/inet.h> | |
19 | #include <linux/in.h> | |
20 | #include <linux/ip.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
f587de0e PM |
22 | #include <linux/udp.h> |
23 | #include <linux/tcp.h> | |
24 | #include <linux/skbuff.h> | |
25 | #include <net/route.h> | |
26 | #include <net/ip6_route.h> | |
3f87c08c | 27 | #include <linux/netfilter_ipv6.h> |
f587de0e PM |
28 | |
29 | #include <net/netfilter/nf_conntrack.h> | |
30 | #include <net/netfilter/nf_conntrack_core.h> | |
31 | #include <net/netfilter/nf_conntrack_tuple.h> | |
32 | #include <net/netfilter/nf_conntrack_expect.h> | |
33 | #include <net/netfilter/nf_conntrack_ecache.h> | |
34 | #include <net/netfilter/nf_conntrack_helper.h> | |
5d0aa2cc | 35 | #include <net/netfilter/nf_conntrack_zones.h> |
f587de0e PM |
36 | #include <linux/netfilter/nf_conntrack_h323.h> |
37 | ||
f587de0e PM |
38 | /* Parameters */ |
39 | static unsigned int default_rrq_ttl __read_mostly = 300; | |
40 | module_param(default_rrq_ttl, uint, 0600); | |
41 | MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ"); | |
42 | ||
43 | static int gkrouted_only __read_mostly = 1; | |
44 | module_param(gkrouted_only, int, 0600); | |
45 | MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper"); | |
46 | ||
eb939922 | 47 | static bool callforward_filter __read_mostly = true; |
f587de0e PM |
48 | module_param(callforward_filter, bool, 0600); |
49 | MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations " | |
601e68e1 | 50 | "if both endpoints are on different sides " |
f587de0e PM |
51 | "(determined by routing information)"); |
52 | ||
53 | /* Hooks for NAT */ | |
051966c0 | 54 | int (*set_h245_addr_hook) (struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
55 | unsigned char **data, int dataoff, |
56 | H245_TransportAddress *taddr, | |
643a2c15 | 57 | union nf_inet_addr *addr, __be16 port) |
f587de0e | 58 | __read_mostly; |
051966c0 | 59 | int (*set_h225_addr_hook) (struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
60 | unsigned char **data, int dataoff, |
61 | TransportAddress *taddr, | |
643a2c15 | 62 | union nf_inet_addr *addr, __be16 port) |
f587de0e | 63 | __read_mostly; |
3db05fea | 64 | int (*set_sig_addr_hook) (struct sk_buff *skb, |
f587de0e PM |
65 | struct nf_conn *ct, |
66 | enum ip_conntrack_info ctinfo, | |
051966c0 | 67 | unsigned int protoff, unsigned char **data, |
f587de0e | 68 | TransportAddress *taddr, int count) __read_mostly; |
3db05fea | 69 | int (*set_ras_addr_hook) (struct sk_buff *skb, |
f587de0e PM |
70 | struct nf_conn *ct, |
71 | enum ip_conntrack_info ctinfo, | |
051966c0 | 72 | unsigned int protoff, unsigned char **data, |
f587de0e | 73 | TransportAddress *taddr, int count) __read_mostly; |
3db05fea | 74 | int (*nat_rtp_rtcp_hook) (struct sk_buff *skb, |
f587de0e PM |
75 | struct nf_conn *ct, |
76 | enum ip_conntrack_info ctinfo, | |
051966c0 | 77 | unsigned int protoff, |
f587de0e PM |
78 | unsigned char **data, int dataoff, |
79 | H245_TransportAddress *taddr, | |
80 | __be16 port, __be16 rtp_port, | |
81 | struct nf_conntrack_expect *rtp_exp, | |
82 | struct nf_conntrack_expect *rtcp_exp) __read_mostly; | |
3db05fea | 83 | int (*nat_t120_hook) (struct sk_buff *skb, |
f587de0e PM |
84 | struct nf_conn *ct, |
85 | enum ip_conntrack_info ctinfo, | |
051966c0 | 86 | unsigned int protoff, |
f587de0e PM |
87 | unsigned char **data, int dataoff, |
88 | H245_TransportAddress *taddr, __be16 port, | |
89 | struct nf_conntrack_expect *exp) __read_mostly; | |
3db05fea | 90 | int (*nat_h245_hook) (struct sk_buff *skb, |
f587de0e PM |
91 | struct nf_conn *ct, |
92 | enum ip_conntrack_info ctinfo, | |
051966c0 | 93 | unsigned int protoff, |
f587de0e PM |
94 | unsigned char **data, int dataoff, |
95 | TransportAddress *taddr, __be16 port, | |
96 | struct nf_conntrack_expect *exp) __read_mostly; | |
3db05fea | 97 | int (*nat_callforwarding_hook) (struct sk_buff *skb, |
f587de0e PM |
98 | struct nf_conn *ct, |
99 | enum ip_conntrack_info ctinfo, | |
051966c0 | 100 | unsigned int protoff, |
f587de0e PM |
101 | unsigned char **data, int dataoff, |
102 | TransportAddress *taddr, __be16 port, | |
103 | struct nf_conntrack_expect *exp) __read_mostly; | |
3db05fea | 104 | int (*nat_q931_hook) (struct sk_buff *skb, |
f587de0e PM |
105 | struct nf_conn *ct, |
106 | enum ip_conntrack_info ctinfo, | |
051966c0 | 107 | unsigned int protoff, |
f587de0e PM |
108 | unsigned char **data, TransportAddress *taddr, int idx, |
109 | __be16 port, struct nf_conntrack_expect *exp) | |
110 | __read_mostly; | |
111 | ||
112 | static DEFINE_SPINLOCK(nf_h323_lock); | |
113 | static char *h323_buffer; | |
114 | ||
115 | static struct nf_conntrack_helper nf_conntrack_helper_h245; | |
116 | static struct nf_conntrack_helper nf_conntrack_helper_q931[]; | |
117 | static struct nf_conntrack_helper nf_conntrack_helper_ras[]; | |
118 | ||
3db05fea | 119 | static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
120 | struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
121 | unsigned char **data, int *datalen, int *dataoff) | |
122 | { | |
1afc5679 | 123 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
f587de0e | 124 | int dir = CTINFO2DIR(ctinfo); |
905e3e8e JE |
125 | const struct tcphdr *th; |
126 | struct tcphdr _tcph; | |
f587de0e PM |
127 | int tcpdatalen; |
128 | int tcpdataoff; | |
129 | unsigned char *tpkt; | |
130 | int tpktlen; | |
131 | int tpktoff; | |
132 | ||
133 | /* Get TCP header */ | |
3db05fea | 134 | th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph); |
f587de0e PM |
135 | if (th == NULL) |
136 | return 0; | |
137 | ||
138 | /* Get TCP data offset */ | |
139 | tcpdataoff = protoff + th->doff * 4; | |
140 | ||
141 | /* Get TCP data length */ | |
3db05fea | 142 | tcpdatalen = skb->len - tcpdataoff; |
f587de0e PM |
143 | if (tcpdatalen <= 0) /* No TCP data */ |
144 | goto clear_out; | |
145 | ||
146 | if (*data == NULL) { /* first TPKT */ | |
147 | /* Get first TPKT pointer */ | |
3db05fea | 148 | tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen, |
f587de0e PM |
149 | h323_buffer); |
150 | BUG_ON(tpkt == NULL); | |
151 | ||
152 | /* Validate TPKT identifier */ | |
153 | if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) { | |
154 | /* Netmeeting sends TPKT header and data separately */ | |
155 | if (info->tpkt_len[dir] > 0) { | |
0d53778e PM |
156 | pr_debug("nf_ct_h323: previous packet " |
157 | "indicated separate TPKT data of %hu " | |
158 | "bytes\n", info->tpkt_len[dir]); | |
f587de0e PM |
159 | if (info->tpkt_len[dir] <= tcpdatalen) { |
160 | /* Yes, there was a TPKT header | |
161 | * received */ | |
162 | *data = tpkt; | |
163 | *datalen = info->tpkt_len[dir]; | |
164 | *dataoff = 0; | |
165 | goto out; | |
166 | } | |
167 | ||
168 | /* Fragmented TPKT */ | |
0d53778e | 169 | pr_debug("nf_ct_h323: fragmented TPKT\n"); |
f587de0e PM |
170 | goto clear_out; |
171 | } | |
172 | ||
173 | /* It is not even a TPKT */ | |
174 | return 0; | |
175 | } | |
176 | tpktoff = 0; | |
177 | } else { /* Next TPKT */ | |
178 | tpktoff = *dataoff + *datalen; | |
179 | tcpdatalen -= tpktoff; | |
180 | if (tcpdatalen <= 4) /* No more TPKT */ | |
181 | goto clear_out; | |
182 | tpkt = *data + *datalen; | |
183 | ||
184 | /* Validate TPKT identifier */ | |
185 | if (tpkt[0] != 0x03 || tpkt[1] != 0) | |
186 | goto clear_out; | |
187 | } | |
188 | ||
189 | /* Validate TPKT length */ | |
190 | tpktlen = tpkt[2] * 256 + tpkt[3]; | |
191 | if (tpktlen < 4) | |
192 | goto clear_out; | |
193 | if (tpktlen > tcpdatalen) { | |
194 | if (tcpdatalen == 4) { /* Separate TPKT header */ | |
195 | /* Netmeeting sends TPKT header and data separately */ | |
0d53778e PM |
196 | pr_debug("nf_ct_h323: separate TPKT header indicates " |
197 | "there will be TPKT data of %hu bytes\n", | |
198 | tpktlen - 4); | |
f587de0e PM |
199 | info->tpkt_len[dir] = tpktlen - 4; |
200 | return 0; | |
201 | } | |
202 | ||
e772c349 | 203 | pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n"); |
f587de0e PM |
204 | goto clear_out; |
205 | } | |
206 | ||
207 | /* This is the encapsulated data */ | |
208 | *data = tpkt + 4; | |
209 | *datalen = tpktlen - 4; | |
210 | *dataoff = tpktoff + 4; | |
211 | ||
212 | out: | |
213 | /* Clear TPKT length */ | |
214 | info->tpkt_len[dir] = 0; | |
215 | return 1; | |
216 | ||
217 | clear_out: | |
218 | info->tpkt_len[dir] = 0; | |
219 | return 0; | |
220 | } | |
221 | ||
905e3e8e | 222 | static int get_h245_addr(struct nf_conn *ct, const unsigned char *data, |
f587de0e | 223 | H245_TransportAddress *taddr, |
643a2c15 | 224 | union nf_inet_addr *addr, __be16 *port) |
f587de0e | 225 | { |
905e3e8e | 226 | const unsigned char *p; |
f587de0e PM |
227 | int len; |
228 | ||
229 | if (taddr->choice != eH245_TransportAddress_unicastAddress) | |
230 | return 0; | |
231 | ||
232 | switch (taddr->unicastAddress.choice) { | |
233 | case eUnicastAddress_iPAddress: | |
5e8fbe2a | 234 | if (nf_ct_l3num(ct) != AF_INET) |
f587de0e PM |
235 | return 0; |
236 | p = data + taddr->unicastAddress.iPAddress.network; | |
237 | len = 4; | |
238 | break; | |
239 | case eUnicastAddress_iP6Address: | |
5e8fbe2a | 240 | if (nf_ct_l3num(ct) != AF_INET6) |
f587de0e PM |
241 | return 0; |
242 | p = data + taddr->unicastAddress.iP6Address.network; | |
243 | len = 16; | |
244 | break; | |
245 | default: | |
246 | return 0; | |
247 | } | |
248 | ||
249 | memcpy(addr, p, len); | |
250 | memset((void *)addr + len, 0, sizeof(*addr) - len); | |
251 | memcpy(port, p + len, sizeof(__be16)); | |
252 | ||
253 | return 1; | |
254 | } | |
255 | ||
3db05fea | 256 | static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 257 | enum ip_conntrack_info ctinfo, |
051966c0 | 258 | unsigned int protoff, |
f587de0e PM |
259 | unsigned char **data, int dataoff, |
260 | H245_TransportAddress *taddr) | |
261 | { | |
262 | int dir = CTINFO2DIR(ctinfo); | |
263 | int ret = 0; | |
264 | __be16 port; | |
265 | __be16 rtp_port, rtcp_port; | |
643a2c15 | 266 | union nf_inet_addr addr; |
f587de0e PM |
267 | struct nf_conntrack_expect *rtp_exp; |
268 | struct nf_conntrack_expect *rtcp_exp; | |
269 | typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp; | |
270 | ||
271 | /* Read RTP or RTCP address */ | |
272 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || | |
273 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
274 | port == 0) | |
275 | return 0; | |
276 | ||
277 | /* RTP port is even */ | |
d109e9af PNA |
278 | rtp_port = port & ~htons(1); |
279 | rtcp_port = port | htons(1); | |
f587de0e PM |
280 | |
281 | /* Create expect for RTP */ | |
6823645d | 282 | if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 283 | return -1; |
5e8fbe2a | 284 | nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
285 | &ct->tuplehash[!dir].tuple.src.u3, |
286 | &ct->tuplehash[!dir].tuple.dst.u3, | |
287 | IPPROTO_UDP, NULL, &rtp_port); | |
f587de0e PM |
288 | |
289 | /* Create expect for RTCP */ | |
6823645d PM |
290 | if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) { |
291 | nf_ct_expect_put(rtp_exp); | |
f587de0e PM |
292 | return -1; |
293 | } | |
5e8fbe2a | 294 | nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
295 | &ct->tuplehash[!dir].tuple.src.u3, |
296 | &ct->tuplehash[!dir].tuple.dst.u3, | |
297 | IPPROTO_UDP, NULL, &rtcp_port); | |
f587de0e PM |
298 | |
299 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
601e68e1 | 300 | &ct->tuplehash[!dir].tuple.dst.u3, |
f587de0e PM |
301 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
302 | (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) && | |
811927cc | 303 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
f587de0e PM |
304 | ct->status & IPS_NAT_MASK) { |
305 | /* NAT needed */ | |
051966c0 | 306 | ret = nat_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
307 | taddr, port, rtp_port, rtp_exp, rtcp_exp); |
308 | } else { /* Conntrack only */ | |
6823645d PM |
309 | if (nf_ct_expect_related(rtp_exp) == 0) { |
310 | if (nf_ct_expect_related(rtcp_exp) == 0) { | |
0d53778e | 311 | pr_debug("nf_ct_h323: expect RTP "); |
3c9fba65 | 312 | nf_ct_dump_tuple(&rtp_exp->tuple); |
0d53778e | 313 | pr_debug("nf_ct_h323: expect RTCP "); |
3c9fba65 | 314 | nf_ct_dump_tuple(&rtcp_exp->tuple); |
f587de0e | 315 | } else { |
6823645d | 316 | nf_ct_unexpect_related(rtp_exp); |
f587de0e PM |
317 | ret = -1; |
318 | } | |
319 | } else | |
320 | ret = -1; | |
321 | } | |
322 | ||
6823645d PM |
323 | nf_ct_expect_put(rtp_exp); |
324 | nf_ct_expect_put(rtcp_exp); | |
f587de0e PM |
325 | |
326 | return ret; | |
327 | } | |
328 | ||
3db05fea | 329 | static int expect_t120(struct sk_buff *skb, |
f587de0e PM |
330 | struct nf_conn *ct, |
331 | enum ip_conntrack_info ctinfo, | |
051966c0 | 332 | unsigned int protoff, |
f587de0e PM |
333 | unsigned char **data, int dataoff, |
334 | H245_TransportAddress *taddr) | |
335 | { | |
336 | int dir = CTINFO2DIR(ctinfo); | |
337 | int ret = 0; | |
338 | __be16 port; | |
643a2c15 | 339 | union nf_inet_addr addr; |
f587de0e PM |
340 | struct nf_conntrack_expect *exp; |
341 | typeof(nat_t120_hook) nat_t120; | |
342 | ||
343 | /* Read T.120 address */ | |
344 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || | |
345 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
346 | port == 0) | |
347 | return 0; | |
348 | ||
349 | /* Create expect for T.120 connections */ | |
6823645d | 350 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 351 | return -1; |
5e8fbe2a | 352 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
353 | &ct->tuplehash[!dir].tuple.src.u3, |
354 | &ct->tuplehash[!dir].tuple.dst.u3, | |
355 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
356 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */ |
357 | ||
358 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
359 | &ct->tuplehash[!dir].tuple.dst.u3, | |
360 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
361 | (nat_t120 = rcu_dereference(nat_t120_hook)) && | |
811927cc | 362 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
f587de0e PM |
363 | ct->status & IPS_NAT_MASK) { |
364 | /* NAT needed */ | |
051966c0 | 365 | ret = nat_t120(skb, ct, ctinfo, protoff, data, dataoff, taddr, |
f587de0e PM |
366 | port, exp); |
367 | } else { /* Conntrack only */ | |
6823645d | 368 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 369 | pr_debug("nf_ct_h323: expect T.120 "); |
3c9fba65 | 370 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
371 | } else |
372 | ret = -1; | |
373 | } | |
374 | ||
6823645d | 375 | nf_ct_expect_put(exp); |
f587de0e PM |
376 | |
377 | return ret; | |
378 | } | |
379 | ||
3db05fea | 380 | static int process_h245_channel(struct sk_buff *skb, |
f587de0e PM |
381 | struct nf_conn *ct, |
382 | enum ip_conntrack_info ctinfo, | |
051966c0 | 383 | unsigned int protoff, |
f587de0e PM |
384 | unsigned char **data, int dataoff, |
385 | H2250LogicalChannelParameters *channel) | |
386 | { | |
387 | int ret; | |
388 | ||
389 | if (channel->options & eH2250LogicalChannelParameters_mediaChannel) { | |
390 | /* RTP */ | |
051966c0 | 391 | ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
392 | &channel->mediaChannel); |
393 | if (ret < 0) | |
394 | return -1; | |
395 | } | |
396 | ||
397 | if (channel-> | |
398 | options & eH2250LogicalChannelParameters_mediaControlChannel) { | |
399 | /* RTCP */ | |
051966c0 | 400 | ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
401 | &channel->mediaControlChannel); |
402 | if (ret < 0) | |
403 | return -1; | |
404 | } | |
405 | ||
406 | return 0; | |
407 | } | |
408 | ||
3db05fea | 409 | static int process_olc(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 410 | enum ip_conntrack_info ctinfo, |
051966c0 | 411 | unsigned int protoff, |
f587de0e PM |
412 | unsigned char **data, int dataoff, |
413 | OpenLogicalChannel *olc) | |
414 | { | |
415 | int ret; | |
416 | ||
0d53778e | 417 | pr_debug("nf_ct_h323: OpenLogicalChannel\n"); |
f587de0e PM |
418 | |
419 | if (olc->forwardLogicalChannelParameters.multiplexParameters.choice == | |
420 | eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters) | |
421 | { | |
051966c0 PM |
422 | ret = process_h245_channel(skb, ct, ctinfo, |
423 | protoff, data, dataoff, | |
f587de0e PM |
424 | &olc-> |
425 | forwardLogicalChannelParameters. | |
426 | multiplexParameters. | |
427 | h2250LogicalChannelParameters); | |
428 | if (ret < 0) | |
429 | return -1; | |
430 | } | |
431 | ||
432 | if ((olc->options & | |
433 | eOpenLogicalChannel_reverseLogicalChannelParameters) && | |
434 | (olc->reverseLogicalChannelParameters.options & | |
435 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters) | |
436 | && (olc->reverseLogicalChannelParameters.multiplexParameters. | |
437 | choice == | |
438 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) | |
439 | { | |
440 | ret = | |
051966c0 PM |
441 | process_h245_channel(skb, ct, ctinfo, |
442 | protoff, data, dataoff, | |
f587de0e PM |
443 | &olc-> |
444 | reverseLogicalChannelParameters. | |
445 | multiplexParameters. | |
446 | h2250LogicalChannelParameters); | |
447 | if (ret < 0) | |
448 | return -1; | |
449 | } | |
450 | ||
451 | if ((olc->options & eOpenLogicalChannel_separateStack) && | |
452 | olc->forwardLogicalChannelParameters.dataType.choice == | |
453 | eDataType_data && | |
454 | olc->forwardLogicalChannelParameters.dataType.data.application. | |
455 | choice == eDataApplicationCapability_application_t120 && | |
456 | olc->forwardLogicalChannelParameters.dataType.data.application. | |
457 | t120.choice == eDataProtocolCapability_separateLANStack && | |
458 | olc->separateStack.networkAddress.choice == | |
459 | eNetworkAccessParameters_networkAddress_localAreaAddress) { | |
051966c0 | 460 | ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
461 | &olc->separateStack.networkAddress. |
462 | localAreaAddress); | |
463 | if (ret < 0) | |
464 | return -1; | |
465 | } | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
3db05fea | 470 | static int process_olca(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 471 | enum ip_conntrack_info ctinfo, |
051966c0 | 472 | unsigned int protoff, unsigned char **data, int dataoff, |
f587de0e PM |
473 | OpenLogicalChannelAck *olca) |
474 | { | |
475 | H2250LogicalChannelAckParameters *ack; | |
476 | int ret; | |
477 | ||
0d53778e | 478 | pr_debug("nf_ct_h323: OpenLogicalChannelAck\n"); |
f587de0e PM |
479 | |
480 | if ((olca->options & | |
481 | eOpenLogicalChannelAck_reverseLogicalChannelParameters) && | |
482 | (olca->reverseLogicalChannelParameters.options & | |
483 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters) | |
484 | && (olca->reverseLogicalChannelParameters.multiplexParameters. | |
485 | choice == | |
486 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) | |
487 | { | |
051966c0 PM |
488 | ret = process_h245_channel(skb, ct, ctinfo, |
489 | protoff, data, dataoff, | |
f587de0e PM |
490 | &olca-> |
491 | reverseLogicalChannelParameters. | |
492 | multiplexParameters. | |
493 | h2250LogicalChannelParameters); | |
494 | if (ret < 0) | |
495 | return -1; | |
496 | } | |
497 | ||
498 | if ((olca->options & | |
499 | eOpenLogicalChannelAck_forwardMultiplexAckParameters) && | |
500 | (olca->forwardMultiplexAckParameters.choice == | |
501 | eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters)) | |
502 | { | |
503 | ack = &olca->forwardMultiplexAckParameters. | |
504 | h2250LogicalChannelAckParameters; | |
505 | if (ack->options & | |
506 | eH2250LogicalChannelAckParameters_mediaChannel) { | |
507 | /* RTP */ | |
051966c0 PM |
508 | ret = expect_rtp_rtcp(skb, ct, ctinfo, |
509 | protoff, data, dataoff, | |
f587de0e PM |
510 | &ack->mediaChannel); |
511 | if (ret < 0) | |
512 | return -1; | |
513 | } | |
514 | ||
515 | if (ack->options & | |
516 | eH2250LogicalChannelAckParameters_mediaControlChannel) { | |
517 | /* RTCP */ | |
051966c0 PM |
518 | ret = expect_rtp_rtcp(skb, ct, ctinfo, |
519 | protoff, data, dataoff, | |
f587de0e PM |
520 | &ack->mediaControlChannel); |
521 | if (ret < 0) | |
522 | return -1; | |
523 | } | |
524 | } | |
525 | ||
f8f1c08e JMZ |
526 | if ((olca->options & eOpenLogicalChannelAck_separateStack) && |
527 | olca->separateStack.networkAddress.choice == | |
528 | eNetworkAccessParameters_networkAddress_localAreaAddress) { | |
051966c0 | 529 | ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff, |
f8f1c08e JMZ |
530 | &olca->separateStack.networkAddress. |
531 | localAreaAddress); | |
532 | if (ret < 0) | |
533 | return -1; | |
534 | } | |
535 | ||
f587de0e PM |
536 | return 0; |
537 | } | |
538 | ||
3db05fea | 539 | static int process_h245(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 540 | enum ip_conntrack_info ctinfo, |
051966c0 | 541 | unsigned int protoff, unsigned char **data, int dataoff, |
f587de0e PM |
542 | MultimediaSystemControlMessage *mscm) |
543 | { | |
544 | switch (mscm->choice) { | |
545 | case eMultimediaSystemControlMessage_request: | |
546 | if (mscm->request.choice == | |
547 | eRequestMessage_openLogicalChannel) { | |
051966c0 PM |
548 | return process_olc(skb, ct, ctinfo, |
549 | protoff, data, dataoff, | |
f587de0e PM |
550 | &mscm->request.openLogicalChannel); |
551 | } | |
0d53778e PM |
552 | pr_debug("nf_ct_h323: H.245 Request %d\n", |
553 | mscm->request.choice); | |
f587de0e PM |
554 | break; |
555 | case eMultimediaSystemControlMessage_response: | |
556 | if (mscm->response.choice == | |
557 | eResponseMessage_openLogicalChannelAck) { | |
051966c0 PM |
558 | return process_olca(skb, ct, ctinfo, |
559 | protoff, data, dataoff, | |
f587de0e PM |
560 | &mscm->response. |
561 | openLogicalChannelAck); | |
562 | } | |
0d53778e PM |
563 | pr_debug("nf_ct_h323: H.245 Response %d\n", |
564 | mscm->response.choice); | |
f587de0e PM |
565 | break; |
566 | default: | |
0d53778e | 567 | pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice); |
f587de0e PM |
568 | break; |
569 | } | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
3db05fea | 574 | static int h245_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
575 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
576 | { | |
577 | static MultimediaSystemControlMessage mscm; | |
578 | unsigned char *data = NULL; | |
579 | int datalen; | |
580 | int dataoff; | |
581 | int ret; | |
582 | ||
583 | /* Until there's been traffic both ways, don't look in packets. */ | |
fb048833 | 584 | if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) |
f587de0e | 585 | return NF_ACCEPT; |
fb048833 | 586 | |
3db05fea | 587 | pr_debug("nf_ct_h245: skblen = %u\n", skb->len); |
f587de0e PM |
588 | |
589 | spin_lock_bh(&nf_h323_lock); | |
590 | ||
591 | /* Process each TPKT */ | |
3db05fea | 592 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
f587de0e | 593 | &data, &datalen, &dataoff)) { |
0d53778e | 594 | pr_debug("nf_ct_h245: TPKT len=%d ", datalen); |
3c9fba65 | 595 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
f587de0e PM |
596 | |
597 | /* Decode H.245 signal */ | |
598 | ret = DecodeMultimediaSystemControlMessage(data, datalen, | |
599 | &mscm); | |
600 | if (ret < 0) { | |
0d53778e PM |
601 | pr_debug("nf_ct_h245: decoding error: %s\n", |
602 | ret == H323_ERROR_BOUND ? | |
603 | "out of bound" : "out of range"); | |
f587de0e PM |
604 | /* We don't drop when decoding error */ |
605 | break; | |
606 | } | |
607 | ||
608 | /* Process H.245 signal */ | |
051966c0 PM |
609 | if (process_h245(skb, ct, ctinfo, protoff, |
610 | &data, dataoff, &mscm) < 0) | |
f587de0e PM |
611 | goto drop; |
612 | } | |
613 | ||
614 | spin_unlock_bh(&nf_h323_lock); | |
615 | return NF_ACCEPT; | |
616 | ||
617 | drop: | |
618 | spin_unlock_bh(&nf_h323_lock); | |
b20ab9cc | 619 | nf_ct_helper_log(skb, ct, "cannot process H.245 message"); |
f587de0e PM |
620 | return NF_DROP; |
621 | } | |
622 | ||
6002f266 PM |
623 | static const struct nf_conntrack_expect_policy h245_exp_policy = { |
624 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */, | |
625 | .timeout = 240, | |
626 | }; | |
627 | ||
f587de0e PM |
628 | static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { |
629 | .name = "H.245", | |
630 | .me = THIS_MODULE, | |
a56b8f81 | 631 | .tuple.src.l3num = AF_UNSPEC, |
f587de0e | 632 | .tuple.dst.protonum = IPPROTO_UDP, |
6002f266 PM |
633 | .help = h245_help, |
634 | .expect_policy = &h245_exp_policy, | |
f587de0e PM |
635 | }; |
636 | ||
f587de0e PM |
637 | int get_h225_addr(struct nf_conn *ct, unsigned char *data, |
638 | TransportAddress *taddr, | |
643a2c15 | 639 | union nf_inet_addr *addr, __be16 *port) |
f587de0e | 640 | { |
905e3e8e | 641 | const unsigned char *p; |
f587de0e PM |
642 | int len; |
643 | ||
644 | switch (taddr->choice) { | |
645 | case eTransportAddress_ipAddress: | |
5e8fbe2a | 646 | if (nf_ct_l3num(ct) != AF_INET) |
f587de0e PM |
647 | return 0; |
648 | p = data + taddr->ipAddress.ip; | |
649 | len = 4; | |
650 | break; | |
651 | case eTransportAddress_ip6Address: | |
5e8fbe2a | 652 | if (nf_ct_l3num(ct) != AF_INET6) |
f587de0e | 653 | return 0; |
bb807245 | 654 | p = data + taddr->ip6Address.ip; |
f587de0e PM |
655 | len = 16; |
656 | break; | |
657 | default: | |
658 | return 0; | |
659 | } | |
660 | ||
661 | memcpy(addr, p, len); | |
662 | memset((void *)addr + len, 0, sizeof(*addr) - len); | |
663 | memcpy(port, p + len, sizeof(__be16)); | |
664 | ||
665 | return 1; | |
666 | } | |
667 | ||
3db05fea | 668 | static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 669 | enum ip_conntrack_info ctinfo, |
051966c0 | 670 | unsigned int protoff, unsigned char **data, int dataoff, |
f587de0e PM |
671 | TransportAddress *taddr) |
672 | { | |
673 | int dir = CTINFO2DIR(ctinfo); | |
674 | int ret = 0; | |
675 | __be16 port; | |
643a2c15 | 676 | union nf_inet_addr addr; |
f587de0e PM |
677 | struct nf_conntrack_expect *exp; |
678 | typeof(nat_h245_hook) nat_h245; | |
679 | ||
680 | /* Read h245Address */ | |
681 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || | |
682 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || | |
683 | port == 0) | |
684 | return 0; | |
685 | ||
686 | /* Create expect for h245 connection */ | |
6823645d | 687 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 688 | return -1; |
5e8fbe2a | 689 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
690 | &ct->tuplehash[!dir].tuple.src.u3, |
691 | &ct->tuplehash[!dir].tuple.dst.u3, | |
692 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
693 | exp->helper = &nf_conntrack_helper_h245; |
694 | ||
695 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
696 | &ct->tuplehash[!dir].tuple.dst.u3, | |
697 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
698 | (nat_h245 = rcu_dereference(nat_h245_hook)) && | |
811927cc | 699 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
f587de0e PM |
700 | ct->status & IPS_NAT_MASK) { |
701 | /* NAT needed */ | |
051966c0 | 702 | ret = nat_h245(skb, ct, ctinfo, protoff, data, dataoff, taddr, |
f587de0e PM |
703 | port, exp); |
704 | } else { /* Conntrack only */ | |
6823645d | 705 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 706 | pr_debug("nf_ct_q931: expect H.245 "); |
3c9fba65 | 707 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
708 | } else |
709 | ret = -1; | |
710 | } | |
711 | ||
6823645d | 712 | nf_ct_expect_put(exp); |
f587de0e PM |
713 | |
714 | return ret; | |
715 | } | |
716 | ||
717 | /* If the calling party is on the same side of the forward-to party, | |
ca9b0147 VR |
718 | * we don't need to track the second call |
719 | */ | |
2c7b5d5d VA |
720 | static int callforward_do_filter(struct net *net, |
721 | const union nf_inet_addr *src, | |
76108cea JE |
722 | const union nf_inet_addr *dst, |
723 | u_int8_t family) | |
f587de0e | 724 | { |
f587de0e PM |
725 | int ret = 0; |
726 | ||
f587de0e PM |
727 | switch (family) { |
728 | case AF_INET: { | |
5a49d0e0 | 729 | struct flowi4 fl1, fl2; |
f587de0e PM |
730 | struct rtable *rt1, *rt2; |
731 | ||
5a49d0e0 DM |
732 | memset(&fl1, 0, sizeof(fl1)); |
733 | fl1.daddr = src->ip; | |
734 | ||
735 | memset(&fl2, 0, sizeof(fl2)); | |
736 | fl2.daddr = dst->ip; | |
3f87c08c PNA |
737 | if (!nf_ip_route(net, (struct dst_entry **)&rt1, |
738 | flowi4_to_flowi(&fl1), false)) { | |
739 | if (!nf_ip_route(net, (struct dst_entry **)&rt2, | |
740 | flowi4_to_flowi(&fl2), false)) { | |
bbb5823c JA |
741 | if (rt_nexthop(rt1, fl1.daddr) == |
742 | rt_nexthop(rt2, fl2.daddr) && | |
d8d1f30b | 743 | rt1->dst.dev == rt2->dst.dev) |
f587de0e | 744 | ret = 1; |
d8d1f30b | 745 | dst_release(&rt2->dst); |
f587de0e | 746 | } |
d8d1f30b | 747 | dst_release(&rt1->dst); |
f587de0e PM |
748 | } |
749 | break; | |
750 | } | |
c0cd1156 | 751 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6) |
f587de0e | 752 | case AF_INET6: { |
3f87c08c | 753 | const struct nf_ipv6_ops *v6ops; |
f587de0e | 754 | struct rt6_info *rt1, *rt2; |
3f87c08c PNA |
755 | struct flowi6 fl1, fl2; |
756 | ||
757 | v6ops = nf_get_ipv6_ops(); | |
758 | if (!v6ops) | |
759 | return 0; | |
f587de0e | 760 | |
5a49d0e0 | 761 | memset(&fl1, 0, sizeof(fl1)); |
4e3fd7a0 | 762 | fl1.daddr = src->in6; |
5a49d0e0 DM |
763 | |
764 | memset(&fl2, 0, sizeof(fl2)); | |
4e3fd7a0 | 765 | fl2.daddr = dst->in6; |
3f87c08c PNA |
766 | if (!v6ops->route(net, (struct dst_entry **)&rt1, |
767 | flowi6_to_flowi(&fl1), false)) { | |
768 | if (!v6ops->route(net, (struct dst_entry **)&rt2, | |
769 | flowi6_to_flowi(&fl2), false)) { | |
2647a9b0 MKL |
770 | if (ipv6_addr_equal(rt6_nexthop(rt1, &fl1.daddr), |
771 | rt6_nexthop(rt2, &fl2.daddr)) && | |
d8d1f30b | 772 | rt1->dst.dev == rt2->dst.dev) |
f587de0e | 773 | ret = 1; |
d8d1f30b | 774 | dst_release(&rt2->dst); |
f587de0e | 775 | } |
d8d1f30b | 776 | dst_release(&rt1->dst); |
f587de0e PM |
777 | } |
778 | break; | |
779 | } | |
780 | #endif | |
781 | } | |
782 | return ret; | |
783 | ||
784 | } | |
785 | ||
3db05fea | 786 | static int expect_callforwarding(struct sk_buff *skb, |
f587de0e PM |
787 | struct nf_conn *ct, |
788 | enum ip_conntrack_info ctinfo, | |
051966c0 | 789 | unsigned int protoff, |
f587de0e PM |
790 | unsigned char **data, int dataoff, |
791 | TransportAddress *taddr) | |
792 | { | |
793 | int dir = CTINFO2DIR(ctinfo); | |
794 | int ret = 0; | |
795 | __be16 port; | |
643a2c15 | 796 | union nf_inet_addr addr; |
f587de0e | 797 | struct nf_conntrack_expect *exp; |
2c7b5d5d | 798 | struct net *net = nf_ct_net(ct); |
f587de0e PM |
799 | typeof(nat_callforwarding_hook) nat_callforwarding; |
800 | ||
801 | /* Read alternativeAddress */ | |
802 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) | |
803 | return 0; | |
804 | ||
805 | /* If the calling party is on the same side of the forward-to party, | |
ca9b0147 VR |
806 | * we don't need to track the second call |
807 | */ | |
f587de0e | 808 | if (callforward_filter && |
2c7b5d5d | 809 | callforward_do_filter(net, &addr, &ct->tuplehash[!dir].tuple.src.u3, |
5e8fbe2a | 810 | nf_ct_l3num(ct))) { |
0d53778e | 811 | pr_debug("nf_ct_q931: Call Forwarding not tracked\n"); |
f587de0e PM |
812 | return 0; |
813 | } | |
814 | ||
815 | /* Create expect for the second call leg */ | |
6823645d | 816 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 817 | return -1; |
5e8fbe2a | 818 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
819 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
820 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
821 | exp->helper = nf_conntrack_helper_q931; |
822 | ||
823 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, | |
824 | &ct->tuplehash[!dir].tuple.dst.u3, | |
825 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && | |
826 | (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && | |
811927cc | 827 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
f587de0e PM |
828 | ct->status & IPS_NAT_MASK) { |
829 | /* Need NAT */ | |
051966c0 PM |
830 | ret = nat_callforwarding(skb, ct, ctinfo, |
831 | protoff, data, dataoff, | |
f587de0e PM |
832 | taddr, port, exp); |
833 | } else { /* Conntrack only */ | |
6823645d | 834 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 835 | pr_debug("nf_ct_q931: expect Call Forwarding "); |
3c9fba65 | 836 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
837 | } else |
838 | ret = -1; | |
839 | } | |
840 | ||
6823645d | 841 | nf_ct_expect_put(exp); |
f587de0e PM |
842 | |
843 | return ret; | |
844 | } | |
845 | ||
3db05fea | 846 | static int process_setup(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 847 | enum ip_conntrack_info ctinfo, |
051966c0 | 848 | unsigned int protoff, |
f587de0e PM |
849 | unsigned char **data, int dataoff, |
850 | Setup_UUIE *setup) | |
851 | { | |
852 | int dir = CTINFO2DIR(ctinfo); | |
853 | int ret; | |
854 | int i; | |
855 | __be16 port; | |
643a2c15 | 856 | union nf_inet_addr addr; |
f587de0e PM |
857 | typeof(set_h225_addr_hook) set_h225_addr; |
858 | ||
0d53778e | 859 | pr_debug("nf_ct_q931: Setup\n"); |
f587de0e PM |
860 | |
861 | if (setup->options & eSetup_UUIE_h245Address) { | |
051966c0 | 862 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
863 | &setup->h245Address); |
864 | if (ret < 0) | |
865 | return -1; | |
866 | } | |
867 | ||
868 | set_h225_addr = rcu_dereference(set_h225_addr_hook); | |
869 | if ((setup->options & eSetup_UUIE_destCallSignalAddress) && | |
811927cc PM |
870 | (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
871 | ct->status & IPS_NAT_MASK && | |
f587de0e | 872 | get_h225_addr(ct, *data, &setup->destCallSignalAddress, |
601e68e1 | 873 | &addr, &port) && |
f587de0e | 874 | memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { |
5b095d98 | 875 | pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
38ff4fa4 | 876 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3, |
0d53778e | 877 | ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port)); |
051966c0 | 878 | ret = set_h225_addr(skb, protoff, data, dataoff, |
f587de0e PM |
879 | &setup->destCallSignalAddress, |
880 | &ct->tuplehash[!dir].tuple.src.u3, | |
881 | ct->tuplehash[!dir].tuple.src.u.tcp.port); | |
882 | if (ret < 0) | |
883 | return -1; | |
884 | } | |
885 | ||
886 | if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && | |
811927cc PM |
887 | (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
888 | ct->status & IPS_NAT_MASK && | |
f587de0e | 889 | get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, |
601e68e1 | 890 | &addr, &port) && |
f587de0e | 891 | memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { |
5b095d98 | 892 | pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
38ff4fa4 | 893 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3, |
0d53778e | 894 | ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); |
051966c0 | 895 | ret = set_h225_addr(skb, protoff, data, dataoff, |
f587de0e PM |
896 | &setup->sourceCallSignalAddress, |
897 | &ct->tuplehash[!dir].tuple.dst.u3, | |
898 | ct->tuplehash[!dir].tuple.dst.u.tcp.port); | |
899 | if (ret < 0) | |
900 | return -1; | |
901 | } | |
902 | ||
903 | if (setup->options & eSetup_UUIE_fastStart) { | |
904 | for (i = 0; i < setup->fastStart.count; i++) { | |
051966c0 PM |
905 | ret = process_olc(skb, ct, ctinfo, |
906 | protoff, data, dataoff, | |
f587de0e PM |
907 | &setup->fastStart.item[i]); |
908 | if (ret < 0) | |
909 | return -1; | |
910 | } | |
911 | } | |
912 | ||
913 | return 0; | |
914 | } | |
915 | ||
3db05fea | 916 | static int process_callproceeding(struct sk_buff *skb, |
f587de0e PM |
917 | struct nf_conn *ct, |
918 | enum ip_conntrack_info ctinfo, | |
051966c0 | 919 | unsigned int protoff, |
f587de0e PM |
920 | unsigned char **data, int dataoff, |
921 | CallProceeding_UUIE *callproc) | |
922 | { | |
923 | int ret; | |
924 | int i; | |
925 | ||
0d53778e | 926 | pr_debug("nf_ct_q931: CallProceeding\n"); |
f587de0e PM |
927 | |
928 | if (callproc->options & eCallProceeding_UUIE_h245Address) { | |
051966c0 | 929 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
930 | &callproc->h245Address); |
931 | if (ret < 0) | |
932 | return -1; | |
933 | } | |
934 | ||
935 | if (callproc->options & eCallProceeding_UUIE_fastStart) { | |
936 | for (i = 0; i < callproc->fastStart.count; i++) { | |
051966c0 PM |
937 | ret = process_olc(skb, ct, ctinfo, |
938 | protoff, data, dataoff, | |
f587de0e PM |
939 | &callproc->fastStart.item[i]); |
940 | if (ret < 0) | |
941 | return -1; | |
942 | } | |
943 | } | |
944 | ||
945 | return 0; | |
946 | } | |
947 | ||
3db05fea | 948 | static int process_connect(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 949 | enum ip_conntrack_info ctinfo, |
051966c0 | 950 | unsigned int protoff, |
f587de0e PM |
951 | unsigned char **data, int dataoff, |
952 | Connect_UUIE *connect) | |
953 | { | |
954 | int ret; | |
955 | int i; | |
956 | ||
0d53778e | 957 | pr_debug("nf_ct_q931: Connect\n"); |
f587de0e PM |
958 | |
959 | if (connect->options & eConnect_UUIE_h245Address) { | |
051966c0 | 960 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
961 | &connect->h245Address); |
962 | if (ret < 0) | |
963 | return -1; | |
964 | } | |
965 | ||
966 | if (connect->options & eConnect_UUIE_fastStart) { | |
967 | for (i = 0; i < connect->fastStart.count; i++) { | |
051966c0 PM |
968 | ret = process_olc(skb, ct, ctinfo, |
969 | protoff, data, dataoff, | |
f587de0e PM |
970 | &connect->fastStart.item[i]); |
971 | if (ret < 0) | |
972 | return -1; | |
973 | } | |
974 | } | |
975 | ||
976 | return 0; | |
977 | } | |
978 | ||
3db05fea | 979 | static int process_alerting(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 980 | enum ip_conntrack_info ctinfo, |
051966c0 | 981 | unsigned int protoff, |
f587de0e PM |
982 | unsigned char **data, int dataoff, |
983 | Alerting_UUIE *alert) | |
984 | { | |
985 | int ret; | |
986 | int i; | |
987 | ||
0d53778e | 988 | pr_debug("nf_ct_q931: Alerting\n"); |
f587de0e PM |
989 | |
990 | if (alert->options & eAlerting_UUIE_h245Address) { | |
051966c0 | 991 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
992 | &alert->h245Address); |
993 | if (ret < 0) | |
994 | return -1; | |
995 | } | |
996 | ||
997 | if (alert->options & eAlerting_UUIE_fastStart) { | |
998 | for (i = 0; i < alert->fastStart.count; i++) { | |
051966c0 PM |
999 | ret = process_olc(skb, ct, ctinfo, |
1000 | protoff, data, dataoff, | |
f587de0e PM |
1001 | &alert->fastStart.item[i]); |
1002 | if (ret < 0) | |
1003 | return -1; | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | return 0; | |
1008 | } | |
1009 | ||
3db05fea | 1010 | static int process_facility(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1011 | enum ip_conntrack_info ctinfo, |
051966c0 | 1012 | unsigned int protoff, |
f587de0e PM |
1013 | unsigned char **data, int dataoff, |
1014 | Facility_UUIE *facility) | |
1015 | { | |
1016 | int ret; | |
1017 | int i; | |
1018 | ||
0d53778e | 1019 | pr_debug("nf_ct_q931: Facility\n"); |
f587de0e PM |
1020 | |
1021 | if (facility->reason.choice == eFacilityReason_callForwarded) { | |
1022 | if (facility->options & eFacility_UUIE_alternativeAddress) | |
051966c0 PM |
1023 | return expect_callforwarding(skb, ct, ctinfo, |
1024 | protoff, data, dataoff, | |
f587de0e PM |
1025 | &facility-> |
1026 | alternativeAddress); | |
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | if (facility->options & eFacility_UUIE_h245Address) { | |
051966c0 | 1031 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
1032 | &facility->h245Address); |
1033 | if (ret < 0) | |
1034 | return -1; | |
1035 | } | |
1036 | ||
1037 | if (facility->options & eFacility_UUIE_fastStart) { | |
1038 | for (i = 0; i < facility->fastStart.count; i++) { | |
051966c0 PM |
1039 | ret = process_olc(skb, ct, ctinfo, |
1040 | protoff, data, dataoff, | |
f587de0e PM |
1041 | &facility->fastStart.item[i]); |
1042 | if (ret < 0) | |
1043 | return -1; | |
1044 | } | |
1045 | } | |
1046 | ||
1047 | return 0; | |
1048 | } | |
1049 | ||
3db05fea | 1050 | static int process_progress(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1051 | enum ip_conntrack_info ctinfo, |
051966c0 | 1052 | unsigned int protoff, |
f587de0e PM |
1053 | unsigned char **data, int dataoff, |
1054 | Progress_UUIE *progress) | |
1055 | { | |
1056 | int ret; | |
1057 | int i; | |
1058 | ||
0d53778e | 1059 | pr_debug("nf_ct_q931: Progress\n"); |
f587de0e PM |
1060 | |
1061 | if (progress->options & eProgress_UUIE_h245Address) { | |
051966c0 | 1062 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
1063 | &progress->h245Address); |
1064 | if (ret < 0) | |
1065 | return -1; | |
1066 | } | |
1067 | ||
1068 | if (progress->options & eProgress_UUIE_fastStart) { | |
1069 | for (i = 0; i < progress->fastStart.count; i++) { | |
051966c0 PM |
1070 | ret = process_olc(skb, ct, ctinfo, |
1071 | protoff, data, dataoff, | |
f587de0e PM |
1072 | &progress->fastStart.item[i]); |
1073 | if (ret < 0) | |
1074 | return -1; | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | return 0; | |
1079 | } | |
1080 | ||
3db05fea | 1081 | static int process_q931(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1082 | enum ip_conntrack_info ctinfo, |
051966c0 PM |
1083 | unsigned int protoff, unsigned char **data, int dataoff, |
1084 | Q931 *q931) | |
f587de0e PM |
1085 | { |
1086 | H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; | |
1087 | int i; | |
1088 | int ret = 0; | |
1089 | ||
1090 | switch (pdu->h323_message_body.choice) { | |
1091 | case eH323_UU_PDU_h323_message_body_setup: | |
051966c0 | 1092 | ret = process_setup(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
1093 | &pdu->h323_message_body.setup); |
1094 | break; | |
1095 | case eH323_UU_PDU_h323_message_body_callProceeding: | |
051966c0 PM |
1096 | ret = process_callproceeding(skb, ct, ctinfo, |
1097 | protoff, data, dataoff, | |
f587de0e PM |
1098 | &pdu->h323_message_body. |
1099 | callProceeding); | |
1100 | break; | |
1101 | case eH323_UU_PDU_h323_message_body_connect: | |
051966c0 | 1102 | ret = process_connect(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
1103 | &pdu->h323_message_body.connect); |
1104 | break; | |
1105 | case eH323_UU_PDU_h323_message_body_alerting: | |
051966c0 | 1106 | ret = process_alerting(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
1107 | &pdu->h323_message_body.alerting); |
1108 | break; | |
f587de0e | 1109 | case eH323_UU_PDU_h323_message_body_facility: |
051966c0 | 1110 | ret = process_facility(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
1111 | &pdu->h323_message_body.facility); |
1112 | break; | |
1113 | case eH323_UU_PDU_h323_message_body_progress: | |
051966c0 | 1114 | ret = process_progress(skb, ct, ctinfo, protoff, data, dataoff, |
f587de0e PM |
1115 | &pdu->h323_message_body.progress); |
1116 | break; | |
1117 | default: | |
0d53778e PM |
1118 | pr_debug("nf_ct_q931: Q.931 signal %d\n", |
1119 | pdu->h323_message_body.choice); | |
f587de0e PM |
1120 | break; |
1121 | } | |
1122 | ||
1123 | if (ret < 0) | |
1124 | return -1; | |
1125 | ||
1126 | if (pdu->options & eH323_UU_PDU_h245Control) { | |
1127 | for (i = 0; i < pdu->h245Control.count; i++) { | |
051966c0 PM |
1128 | ret = process_h245(skb, ct, ctinfo, |
1129 | protoff, data, dataoff, | |
f587de0e PM |
1130 | &pdu->h245Control.item[i]); |
1131 | if (ret < 0) | |
1132 | return -1; | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | return 0; | |
1137 | } | |
1138 | ||
3db05fea | 1139 | static int q931_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1140 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
1141 | { | |
1142 | static Q931 q931; | |
1143 | unsigned char *data = NULL; | |
1144 | int datalen; | |
1145 | int dataoff; | |
1146 | int ret; | |
1147 | ||
1148 | /* Until there's been traffic both ways, don't look in packets. */ | |
fb048833 | 1149 | if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) |
f587de0e | 1150 | return NF_ACCEPT; |
fb048833 | 1151 | |
3db05fea | 1152 | pr_debug("nf_ct_q931: skblen = %u\n", skb->len); |
f587de0e PM |
1153 | |
1154 | spin_lock_bh(&nf_h323_lock); | |
1155 | ||
1156 | /* Process each TPKT */ | |
3db05fea | 1157 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
f587de0e | 1158 | &data, &datalen, &dataoff)) { |
0d53778e | 1159 | pr_debug("nf_ct_q931: TPKT len=%d ", datalen); |
3c9fba65 | 1160 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
f587de0e PM |
1161 | |
1162 | /* Decode Q.931 signal */ | |
1163 | ret = DecodeQ931(data, datalen, &q931); | |
1164 | if (ret < 0) { | |
0d53778e PM |
1165 | pr_debug("nf_ct_q931: decoding error: %s\n", |
1166 | ret == H323_ERROR_BOUND ? | |
1167 | "out of bound" : "out of range"); | |
f587de0e PM |
1168 | /* We don't drop when decoding error */ |
1169 | break; | |
1170 | } | |
1171 | ||
1172 | /* Process Q.931 signal */ | |
051966c0 PM |
1173 | if (process_q931(skb, ct, ctinfo, protoff, |
1174 | &data, dataoff, &q931) < 0) | |
f587de0e PM |
1175 | goto drop; |
1176 | } | |
1177 | ||
1178 | spin_unlock_bh(&nf_h323_lock); | |
1179 | return NF_ACCEPT; | |
1180 | ||
1181 | drop: | |
1182 | spin_unlock_bh(&nf_h323_lock); | |
b20ab9cc | 1183 | nf_ct_helper_log(skb, ct, "cannot process Q.931 message"); |
f587de0e PM |
1184 | return NF_DROP; |
1185 | } | |
1186 | ||
6002f266 PM |
1187 | static const struct nf_conntrack_expect_policy q931_exp_policy = { |
1188 | /* T.120 and H.245 */ | |
1189 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, | |
1190 | .timeout = 240, | |
1191 | }; | |
1192 | ||
f587de0e PM |
1193 | static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { |
1194 | { | |
1195 | .name = "Q.931", | |
1196 | .me = THIS_MODULE, | |
f587de0e | 1197 | .tuple.src.l3num = AF_INET, |
09640e63 | 1198 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
f587de0e | 1199 | .tuple.dst.protonum = IPPROTO_TCP, |
6002f266 PM |
1200 | .help = q931_help, |
1201 | .expect_policy = &q931_exp_policy, | |
f587de0e PM |
1202 | }, |
1203 | { | |
1204 | .name = "Q.931", | |
1205 | .me = THIS_MODULE, | |
f587de0e | 1206 | .tuple.src.l3num = AF_INET6, |
09640e63 | 1207 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
f587de0e | 1208 | .tuple.dst.protonum = IPPROTO_TCP, |
6002f266 PM |
1209 | .help = q931_help, |
1210 | .expect_policy = &q931_exp_policy, | |
f587de0e PM |
1211 | }, |
1212 | }; | |
1213 | ||
3db05fea | 1214 | static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1215 | int *datalen) |
1216 | { | |
905e3e8e JE |
1217 | const struct udphdr *uh; |
1218 | struct udphdr _uh; | |
f587de0e PM |
1219 | int dataoff; |
1220 | ||
3db05fea | 1221 | uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh); |
f587de0e PM |
1222 | if (uh == NULL) |
1223 | return NULL; | |
1224 | dataoff = protoff + sizeof(_uh); | |
3db05fea | 1225 | if (dataoff >= skb->len) |
f587de0e | 1226 | return NULL; |
3db05fea HX |
1227 | *datalen = skb->len - dataoff; |
1228 | return skb_header_pointer(skb, dataoff, *datalen, h323_buffer); | |
f587de0e PM |
1229 | } |
1230 | ||
f587de0e | 1231 | static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, |
643a2c15 | 1232 | union nf_inet_addr *addr, |
f587de0e PM |
1233 | __be16 port) |
1234 | { | |
84541cc1 | 1235 | struct net *net = nf_ct_net(ct); |
f587de0e PM |
1236 | struct nf_conntrack_expect *exp; |
1237 | struct nf_conntrack_tuple tuple; | |
1238 | ||
1239 | memset(&tuple.src.u3, 0, sizeof(tuple.src.u3)); | |
1240 | tuple.src.u.tcp.port = 0; | |
1241 | memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3)); | |
1242 | tuple.dst.u.tcp.port = port; | |
1243 | tuple.dst.protonum = IPPROTO_TCP; | |
1244 | ||
5d0aa2cc | 1245 | exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple); |
f587de0e PM |
1246 | if (exp && exp->master == ct) |
1247 | return exp; | |
1248 | return NULL; | |
1249 | } | |
1250 | ||
3db05fea | 1251 | static int expect_q931(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1252 | enum ip_conntrack_info ctinfo, |
051966c0 | 1253 | unsigned int protoff, unsigned char **data, |
f587de0e PM |
1254 | TransportAddress *taddr, int count) |
1255 | { | |
1afc5679 | 1256 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
f587de0e PM |
1257 | int dir = CTINFO2DIR(ctinfo); |
1258 | int ret = 0; | |
1259 | int i; | |
1260 | __be16 port; | |
643a2c15 | 1261 | union nf_inet_addr addr; |
f587de0e PM |
1262 | struct nf_conntrack_expect *exp; |
1263 | typeof(nat_q931_hook) nat_q931; | |
1264 | ||
1265 | /* Look for the first related address */ | |
1266 | for (i = 0; i < count; i++) { | |
1267 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && | |
1268 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, | |
601e68e1 | 1269 | sizeof(addr)) == 0 && port != 0) |
f587de0e PM |
1270 | break; |
1271 | } | |
1272 | ||
1273 | if (i >= count) /* Not found */ | |
1274 | return 0; | |
1275 | ||
1276 | /* Create expect for Q.931 */ | |
6823645d | 1277 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1278 | return -1; |
5e8fbe2a | 1279 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
1280 | gkrouted_only ? /* only accept calls from GK? */ |
1281 | &ct->tuplehash[!dir].tuple.src.u3 : NULL, | |
1282 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1283 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1284 | exp->helper = nf_conntrack_helper_q931; |
1285 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ | |
1286 | ||
1287 | nat_q931 = rcu_dereference(nat_q931_hook); | |
811927cc PM |
1288 | if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1289 | ct->status & IPS_NAT_MASK) { /* Need NAT */ | |
051966c0 PM |
1290 | ret = nat_q931(skb, ct, ctinfo, protoff, data, |
1291 | taddr, i, port, exp); | |
f587de0e | 1292 | } else { /* Conntrack only */ |
6823645d | 1293 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1294 | pr_debug("nf_ct_ras: expect Q.931 "); |
3c9fba65 | 1295 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1296 | |
1297 | /* Save port for looking up expect in processing RCF */ | |
1298 | info->sig_port[dir] = port; | |
1299 | } else | |
1300 | ret = -1; | |
1301 | } | |
1302 | ||
6823645d | 1303 | nf_ct_expect_put(exp); |
f587de0e PM |
1304 | |
1305 | return ret; | |
1306 | } | |
1307 | ||
3db05fea | 1308 | static int process_grq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1309 | enum ip_conntrack_info ctinfo, |
051966c0 | 1310 | unsigned int protoff, |
f587de0e PM |
1311 | unsigned char **data, GatekeeperRequest *grq) |
1312 | { | |
1313 | typeof(set_ras_addr_hook) set_ras_addr; | |
1314 | ||
0d53778e | 1315 | pr_debug("nf_ct_ras: GRQ\n"); |
f587de0e PM |
1316 | |
1317 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
811927cc PM |
1318 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1319 | ct->status & IPS_NAT_MASK) /* NATed */ | |
051966c0 | 1320 | return set_ras_addr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1321 | &grq->rasAddress, 1); |
1322 | return 0; | |
1323 | } | |
1324 | ||
3db05fea | 1325 | static int process_gcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1326 | enum ip_conntrack_info ctinfo, |
051966c0 | 1327 | unsigned int protoff, |
f587de0e PM |
1328 | unsigned char **data, GatekeeperConfirm *gcf) |
1329 | { | |
1330 | int dir = CTINFO2DIR(ctinfo); | |
1331 | int ret = 0; | |
1332 | __be16 port; | |
643a2c15 | 1333 | union nf_inet_addr addr; |
f587de0e PM |
1334 | struct nf_conntrack_expect *exp; |
1335 | ||
0d53778e | 1336 | pr_debug("nf_ct_ras: GCF\n"); |
f587de0e PM |
1337 | |
1338 | if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) | |
1339 | return 0; | |
1340 | ||
1341 | /* Registration port is the same as discovery port */ | |
1342 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && | |
1343 | port == ct->tuplehash[dir].tuple.src.u.udp.port) | |
1344 | return 0; | |
1345 | ||
1346 | /* Avoid RAS expectation loops. A GCF is never expected. */ | |
1347 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) | |
1348 | return 0; | |
1349 | ||
1350 | /* Need new expect */ | |
6823645d | 1351 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1352 | return -1; |
5e8fbe2a | 1353 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
1354 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1355 | IPPROTO_UDP, NULL, &port); | |
f587de0e PM |
1356 | exp->helper = nf_conntrack_helper_ras; |
1357 | ||
6823645d | 1358 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1359 | pr_debug("nf_ct_ras: expect RAS "); |
3c9fba65 | 1360 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1361 | } else |
1362 | ret = -1; | |
1363 | ||
6823645d | 1364 | nf_ct_expect_put(exp); |
f587de0e PM |
1365 | |
1366 | return ret; | |
1367 | } | |
1368 | ||
3db05fea | 1369 | static int process_rrq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1370 | enum ip_conntrack_info ctinfo, |
051966c0 | 1371 | unsigned int protoff, |
f587de0e PM |
1372 | unsigned char **data, RegistrationRequest *rrq) |
1373 | { | |
1afc5679 | 1374 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
f587de0e PM |
1375 | int ret; |
1376 | typeof(set_ras_addr_hook) set_ras_addr; | |
1377 | ||
0d53778e | 1378 | pr_debug("nf_ct_ras: RRQ\n"); |
f587de0e | 1379 | |
051966c0 | 1380 | ret = expect_q931(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1381 | rrq->callSignalAddress.item, |
1382 | rrq->callSignalAddress.count); | |
1383 | if (ret < 0) | |
1384 | return -1; | |
1385 | ||
1386 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
811927cc PM |
1387 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1388 | ct->status & IPS_NAT_MASK) { | |
051966c0 | 1389 | ret = set_ras_addr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1390 | rrq->rasAddress.item, |
1391 | rrq->rasAddress.count); | |
1392 | if (ret < 0) | |
1393 | return -1; | |
1394 | } | |
1395 | ||
1396 | if (rrq->options & eRegistrationRequest_timeToLive) { | |
0d53778e | 1397 | pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); |
f587de0e PM |
1398 | info->timeout = rrq->timeToLive; |
1399 | } else | |
1400 | info->timeout = default_rrq_ttl; | |
1401 | ||
1402 | return 0; | |
1403 | } | |
1404 | ||
3db05fea | 1405 | static int process_rcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1406 | enum ip_conntrack_info ctinfo, |
051966c0 | 1407 | unsigned int protoff, |
f587de0e PM |
1408 | unsigned char **data, RegistrationConfirm *rcf) |
1409 | { | |
1afc5679 | 1410 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
f587de0e PM |
1411 | int dir = CTINFO2DIR(ctinfo); |
1412 | int ret; | |
1413 | struct nf_conntrack_expect *exp; | |
1414 | typeof(set_sig_addr_hook) set_sig_addr; | |
1415 | ||
0d53778e | 1416 | pr_debug("nf_ct_ras: RCF\n"); |
f587de0e PM |
1417 | |
1418 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
811927cc PM |
1419 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1420 | ct->status & IPS_NAT_MASK) { | |
051966c0 | 1421 | ret = set_sig_addr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1422 | rcf->callSignalAddress.item, |
1423 | rcf->callSignalAddress.count); | |
1424 | if (ret < 0) | |
1425 | return -1; | |
1426 | } | |
1427 | ||
1428 | if (rcf->options & eRegistrationConfirm_timeToLive) { | |
0d53778e | 1429 | pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); |
f587de0e PM |
1430 | info->timeout = rcf->timeToLive; |
1431 | } | |
1432 | ||
1433 | if (info->timeout > 0) { | |
0d53778e PM |
1434 | pr_debug("nf_ct_ras: set RAS connection timeout to " |
1435 | "%u seconds\n", info->timeout); | |
3db05fea | 1436 | nf_ct_refresh(ct, skb, info->timeout * HZ); |
f587de0e PM |
1437 | |
1438 | /* Set expect timeout */ | |
ca7433df | 1439 | spin_lock_bh(&nf_conntrack_expect_lock); |
f587de0e PM |
1440 | exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, |
1441 | info->sig_port[!dir]); | |
1442 | if (exp) { | |
0d53778e PM |
1443 | pr_debug("nf_ct_ras: set Q.931 expect " |
1444 | "timeout to %u seconds for", | |
1445 | info->timeout); | |
3c9fba65 | 1446 | nf_ct_dump_tuple(&exp->tuple); |
707e6835 LZ |
1447 | mod_timer_pending(&exp->timeout, |
1448 | jiffies + info->timeout * HZ); | |
f587de0e | 1449 | } |
ca7433df | 1450 | spin_unlock_bh(&nf_conntrack_expect_lock); |
f587de0e PM |
1451 | } |
1452 | ||
1453 | return 0; | |
1454 | } | |
1455 | ||
3db05fea | 1456 | static int process_urq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1457 | enum ip_conntrack_info ctinfo, |
051966c0 | 1458 | unsigned int protoff, |
f587de0e PM |
1459 | unsigned char **data, UnregistrationRequest *urq) |
1460 | { | |
1afc5679 | 1461 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
f587de0e PM |
1462 | int dir = CTINFO2DIR(ctinfo); |
1463 | int ret; | |
1464 | typeof(set_sig_addr_hook) set_sig_addr; | |
1465 | ||
0d53778e | 1466 | pr_debug("nf_ct_ras: URQ\n"); |
f587de0e PM |
1467 | |
1468 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
811927cc PM |
1469 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1470 | ct->status & IPS_NAT_MASK) { | |
051966c0 | 1471 | ret = set_sig_addr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1472 | urq->callSignalAddress.item, |
1473 | urq->callSignalAddress.count); | |
1474 | if (ret < 0) | |
1475 | return -1; | |
1476 | } | |
1477 | ||
1478 | /* Clear old expect */ | |
1479 | nf_ct_remove_expectations(ct); | |
1480 | info->sig_port[dir] = 0; | |
1481 | info->sig_port[!dir] = 0; | |
1482 | ||
1483 | /* Give it 30 seconds for UCF or URJ */ | |
3db05fea | 1484 | nf_ct_refresh(ct, skb, 30 * HZ); |
f587de0e PM |
1485 | |
1486 | return 0; | |
1487 | } | |
1488 | ||
3db05fea | 1489 | static int process_arq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1490 | enum ip_conntrack_info ctinfo, |
051966c0 | 1491 | unsigned int protoff, |
f587de0e PM |
1492 | unsigned char **data, AdmissionRequest *arq) |
1493 | { | |
1afc5679 | 1494 | const struct nf_ct_h323_master *info = nfct_help_data(ct); |
f587de0e PM |
1495 | int dir = CTINFO2DIR(ctinfo); |
1496 | __be16 port; | |
643a2c15 | 1497 | union nf_inet_addr addr; |
f587de0e PM |
1498 | typeof(set_h225_addr_hook) set_h225_addr; |
1499 | ||
0d53778e | 1500 | pr_debug("nf_ct_ras: ARQ\n"); |
f587de0e PM |
1501 | |
1502 | set_h225_addr = rcu_dereference(set_h225_addr_hook); | |
1503 | if ((arq->options & eAdmissionRequest_destCallSignalAddress) && | |
1504 | get_h225_addr(ct, *data, &arq->destCallSignalAddress, | |
601e68e1 | 1505 | &addr, &port) && |
f587de0e PM |
1506 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
1507 | port == info->sig_port[dir] && | |
811927cc | 1508 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
f587de0e PM |
1509 | set_h225_addr && ct->status & IPS_NAT_MASK) { |
1510 | /* Answering ARQ */ | |
051966c0 | 1511 | return set_h225_addr(skb, protoff, data, 0, |
f587de0e PM |
1512 | &arq->destCallSignalAddress, |
1513 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1514 | info->sig_port[!dir]); | |
1515 | } | |
1516 | ||
1517 | if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && | |
1518 | get_h225_addr(ct, *data, &arq->srcCallSignalAddress, | |
601e68e1 | 1519 | &addr, &port) && |
f587de0e | 1520 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
811927cc PM |
1521 | set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1522 | ct->status & IPS_NAT_MASK) { | |
f587de0e | 1523 | /* Calling ARQ */ |
051966c0 | 1524 | return set_h225_addr(skb, protoff, data, 0, |
f587de0e PM |
1525 | &arq->srcCallSignalAddress, |
1526 | &ct->tuplehash[!dir].tuple.dst.u3, | |
1527 | port); | |
1528 | } | |
1529 | ||
1530 | return 0; | |
1531 | } | |
1532 | ||
3db05fea | 1533 | static int process_acf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1534 | enum ip_conntrack_info ctinfo, |
051966c0 | 1535 | unsigned int protoff, |
f587de0e PM |
1536 | unsigned char **data, AdmissionConfirm *acf) |
1537 | { | |
1538 | int dir = CTINFO2DIR(ctinfo); | |
1539 | int ret = 0; | |
1540 | __be16 port; | |
643a2c15 | 1541 | union nf_inet_addr addr; |
f587de0e PM |
1542 | struct nf_conntrack_expect *exp; |
1543 | typeof(set_sig_addr_hook) set_sig_addr; | |
1544 | ||
0d53778e | 1545 | pr_debug("nf_ct_ras: ACF\n"); |
f587de0e PM |
1546 | |
1547 | if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, | |
1548 | &addr, &port)) | |
1549 | return 0; | |
1550 | ||
1551 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { | |
1552 | /* Answering ACF */ | |
1553 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
811927cc PM |
1554 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1555 | ct->status & IPS_NAT_MASK) | |
051966c0 | 1556 | return set_sig_addr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1557 | &acf->destCallSignalAddress, 1); |
1558 | return 0; | |
1559 | } | |
1560 | ||
1561 | /* Need new expect */ | |
6823645d | 1562 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1563 | return -1; |
5e8fbe2a | 1564 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
1565 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1566 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1567 | exp->flags = NF_CT_EXPECT_PERMANENT; |
1568 | exp->helper = nf_conntrack_helper_q931; | |
1569 | ||
6823645d | 1570 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1571 | pr_debug("nf_ct_ras: expect Q.931 "); |
3c9fba65 | 1572 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1573 | } else |
1574 | ret = -1; | |
1575 | ||
6823645d | 1576 | nf_ct_expect_put(exp); |
f587de0e PM |
1577 | |
1578 | return ret; | |
1579 | } | |
1580 | ||
3db05fea | 1581 | static int process_lrq(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1582 | enum ip_conntrack_info ctinfo, |
051966c0 | 1583 | unsigned int protoff, |
f587de0e PM |
1584 | unsigned char **data, LocationRequest *lrq) |
1585 | { | |
1586 | typeof(set_ras_addr_hook) set_ras_addr; | |
1587 | ||
0d53778e | 1588 | pr_debug("nf_ct_ras: LRQ\n"); |
f587de0e PM |
1589 | |
1590 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
811927cc PM |
1591 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1592 | ct->status & IPS_NAT_MASK) | |
051966c0 | 1593 | return set_ras_addr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1594 | &lrq->replyAddress, 1); |
1595 | return 0; | |
1596 | } | |
1597 | ||
3db05fea | 1598 | static int process_lcf(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1599 | enum ip_conntrack_info ctinfo, |
051966c0 | 1600 | unsigned int protoff, |
f587de0e PM |
1601 | unsigned char **data, LocationConfirm *lcf) |
1602 | { | |
1603 | int dir = CTINFO2DIR(ctinfo); | |
1604 | int ret = 0; | |
1605 | __be16 port; | |
643a2c15 | 1606 | union nf_inet_addr addr; |
f587de0e PM |
1607 | struct nf_conntrack_expect *exp; |
1608 | ||
0d53778e | 1609 | pr_debug("nf_ct_ras: LCF\n"); |
f587de0e PM |
1610 | |
1611 | if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, | |
1612 | &addr, &port)) | |
1613 | return 0; | |
1614 | ||
1615 | /* Need new expect for call signal */ | |
6823645d | 1616 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
f587de0e | 1617 | return -1; |
5e8fbe2a | 1618 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
6823645d PM |
1619 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
1620 | IPPROTO_TCP, NULL, &port); | |
f587de0e PM |
1621 | exp->flags = NF_CT_EXPECT_PERMANENT; |
1622 | exp->helper = nf_conntrack_helper_q931; | |
1623 | ||
6823645d | 1624 | if (nf_ct_expect_related(exp) == 0) { |
0d53778e | 1625 | pr_debug("nf_ct_ras: expect Q.931 "); |
3c9fba65 | 1626 | nf_ct_dump_tuple(&exp->tuple); |
f587de0e PM |
1627 | } else |
1628 | ret = -1; | |
1629 | ||
6823645d | 1630 | nf_ct_expect_put(exp); |
f587de0e PM |
1631 | |
1632 | /* Ignore rasAddress */ | |
1633 | ||
1634 | return ret; | |
1635 | } | |
1636 | ||
3db05fea | 1637 | static int process_irr(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1638 | enum ip_conntrack_info ctinfo, |
051966c0 | 1639 | unsigned int protoff, |
f587de0e PM |
1640 | unsigned char **data, InfoRequestResponse *irr) |
1641 | { | |
1642 | int ret; | |
1643 | typeof(set_ras_addr_hook) set_ras_addr; | |
1644 | typeof(set_sig_addr_hook) set_sig_addr; | |
1645 | ||
0d53778e | 1646 | pr_debug("nf_ct_ras: IRR\n"); |
f587de0e PM |
1647 | |
1648 | set_ras_addr = rcu_dereference(set_ras_addr_hook); | |
811927cc PM |
1649 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1650 | ct->status & IPS_NAT_MASK) { | |
051966c0 | 1651 | ret = set_ras_addr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1652 | &irr->rasAddress, 1); |
1653 | if (ret < 0) | |
1654 | return -1; | |
1655 | } | |
1656 | ||
1657 | set_sig_addr = rcu_dereference(set_sig_addr_hook); | |
811927cc PM |
1658 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
1659 | ct->status & IPS_NAT_MASK) { | |
051966c0 | 1660 | ret = set_sig_addr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1661 | irr->callSignalAddress.item, |
1662 | irr->callSignalAddress.count); | |
1663 | if (ret < 0) | |
1664 | return -1; | |
1665 | } | |
1666 | ||
1667 | return 0; | |
1668 | } | |
1669 | ||
3db05fea | 1670 | static int process_ras(struct sk_buff *skb, struct nf_conn *ct, |
f587de0e | 1671 | enum ip_conntrack_info ctinfo, |
051966c0 | 1672 | unsigned int protoff, |
f587de0e PM |
1673 | unsigned char **data, RasMessage *ras) |
1674 | { | |
1675 | switch (ras->choice) { | |
1676 | case eRasMessage_gatekeeperRequest: | |
051966c0 | 1677 | return process_grq(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1678 | &ras->gatekeeperRequest); |
1679 | case eRasMessage_gatekeeperConfirm: | |
051966c0 | 1680 | return process_gcf(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1681 | &ras->gatekeeperConfirm); |
1682 | case eRasMessage_registrationRequest: | |
051966c0 | 1683 | return process_rrq(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1684 | &ras->registrationRequest); |
1685 | case eRasMessage_registrationConfirm: | |
051966c0 | 1686 | return process_rcf(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1687 | &ras->registrationConfirm); |
1688 | case eRasMessage_unregistrationRequest: | |
051966c0 | 1689 | return process_urq(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1690 | &ras->unregistrationRequest); |
1691 | case eRasMessage_admissionRequest: | |
051966c0 | 1692 | return process_arq(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1693 | &ras->admissionRequest); |
1694 | case eRasMessage_admissionConfirm: | |
051966c0 | 1695 | return process_acf(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1696 | &ras->admissionConfirm); |
1697 | case eRasMessage_locationRequest: | |
051966c0 | 1698 | return process_lrq(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1699 | &ras->locationRequest); |
1700 | case eRasMessage_locationConfirm: | |
051966c0 | 1701 | return process_lcf(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1702 | &ras->locationConfirm); |
1703 | case eRasMessage_infoRequestResponse: | |
051966c0 | 1704 | return process_irr(skb, ct, ctinfo, protoff, data, |
f587de0e PM |
1705 | &ras->infoRequestResponse); |
1706 | default: | |
0d53778e | 1707 | pr_debug("nf_ct_ras: RAS message %d\n", ras->choice); |
f587de0e PM |
1708 | break; |
1709 | } | |
1710 | ||
1711 | return 0; | |
1712 | } | |
1713 | ||
3db05fea | 1714 | static int ras_help(struct sk_buff *skb, unsigned int protoff, |
f587de0e PM |
1715 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
1716 | { | |
1717 | static RasMessage ras; | |
1718 | unsigned char *data; | |
1719 | int datalen = 0; | |
1720 | int ret; | |
1721 | ||
3db05fea | 1722 | pr_debug("nf_ct_ras: skblen = %u\n", skb->len); |
f587de0e PM |
1723 | |
1724 | spin_lock_bh(&nf_h323_lock); | |
1725 | ||
1726 | /* Get UDP data */ | |
3db05fea | 1727 | data = get_udp_data(skb, protoff, &datalen); |
f587de0e PM |
1728 | if (data == NULL) |
1729 | goto accept; | |
0d53778e | 1730 | pr_debug("nf_ct_ras: RAS message len=%d ", datalen); |
3c9fba65 | 1731 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
f587de0e PM |
1732 | |
1733 | /* Decode RAS message */ | |
1734 | ret = DecodeRasMessage(data, datalen, &ras); | |
1735 | if (ret < 0) { | |
0d53778e PM |
1736 | pr_debug("nf_ct_ras: decoding error: %s\n", |
1737 | ret == H323_ERROR_BOUND ? | |
1738 | "out of bound" : "out of range"); | |
f587de0e PM |
1739 | goto accept; |
1740 | } | |
1741 | ||
1742 | /* Process RAS message */ | |
051966c0 | 1743 | if (process_ras(skb, ct, ctinfo, protoff, &data, &ras) < 0) |
f587de0e PM |
1744 | goto drop; |
1745 | ||
1746 | accept: | |
1747 | spin_unlock_bh(&nf_h323_lock); | |
1748 | return NF_ACCEPT; | |
1749 | ||
1750 | drop: | |
1751 | spin_unlock_bh(&nf_h323_lock); | |
b20ab9cc | 1752 | nf_ct_helper_log(skb, ct, "cannot process RAS message"); |
f587de0e PM |
1753 | return NF_DROP; |
1754 | } | |
1755 | ||
6002f266 PM |
1756 | static const struct nf_conntrack_expect_policy ras_exp_policy = { |
1757 | .max_expected = 32, | |
1758 | .timeout = 240, | |
1759 | }; | |
1760 | ||
f587de0e PM |
1761 | static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { |
1762 | { | |
1763 | .name = "RAS", | |
1764 | .me = THIS_MODULE, | |
f587de0e | 1765 | .tuple.src.l3num = AF_INET, |
09640e63 | 1766 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
f587de0e | 1767 | .tuple.dst.protonum = IPPROTO_UDP, |
f587de0e | 1768 | .help = ras_help, |
6002f266 | 1769 | .expect_policy = &ras_exp_policy, |
f587de0e PM |
1770 | }, |
1771 | { | |
1772 | .name = "RAS", | |
1773 | .me = THIS_MODULE, | |
f587de0e | 1774 | .tuple.src.l3num = AF_INET6, |
09640e63 | 1775 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
f587de0e | 1776 | .tuple.dst.protonum = IPPROTO_UDP, |
f587de0e | 1777 | .help = ras_help, |
6002f266 | 1778 | .expect_policy = &ras_exp_policy, |
f587de0e PM |
1779 | }, |
1780 | }; | |
1781 | ||
d53e3fc3 LZ |
1782 | static int __init h323_helper_init(void) |
1783 | { | |
1784 | int ret; | |
1785 | ||
1786 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245); | |
1787 | if (ret < 0) | |
1788 | return ret; | |
1789 | ret = nf_conntrack_helpers_register(nf_conntrack_helper_q931, | |
1790 | ARRAY_SIZE(nf_conntrack_helper_q931)); | |
1791 | if (ret < 0) | |
1792 | goto err1; | |
1793 | ret = nf_conntrack_helpers_register(nf_conntrack_helper_ras, | |
1794 | ARRAY_SIZE(nf_conntrack_helper_ras)); | |
1795 | if (ret < 0) | |
1796 | goto err2; | |
1797 | ||
1798 | return 0; | |
1799 | err2: | |
1800 | nf_conntrack_helpers_unregister(nf_conntrack_helper_q931, | |
1801 | ARRAY_SIZE(nf_conntrack_helper_q931)); | |
1802 | err1: | |
1803 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); | |
1804 | return ret; | |
1805 | } | |
1806 | ||
1807 | static void __exit h323_helper_exit(void) | |
1808 | { | |
1809 | nf_conntrack_helpers_unregister(nf_conntrack_helper_ras, | |
1810 | ARRAY_SIZE(nf_conntrack_helper_ras)); | |
1811 | nf_conntrack_helpers_unregister(nf_conntrack_helper_q931, | |
1812 | ARRAY_SIZE(nf_conntrack_helper_q931)); | |
1813 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); | |
1814 | } | |
1815 | ||
f587de0e PM |
1816 | static void __exit nf_conntrack_h323_fini(void) |
1817 | { | |
d53e3fc3 | 1818 | h323_helper_exit(); |
f587de0e | 1819 | kfree(h323_buffer); |
0d53778e | 1820 | pr_debug("nf_ct_h323: fini\n"); |
f587de0e PM |
1821 | } |
1822 | ||
f587de0e PM |
1823 | static int __init nf_conntrack_h323_init(void) |
1824 | { | |
1825 | int ret; | |
1826 | ||
dcf67740 FW |
1827 | NF_CT_HELPER_BUILD_BUG_ON(sizeof(struct nf_ct_h323_master)); |
1828 | ||
f587de0e PM |
1829 | h323_buffer = kmalloc(65536, GFP_KERNEL); |
1830 | if (!h323_buffer) | |
1831 | return -ENOMEM; | |
d53e3fc3 | 1832 | ret = h323_helper_init(); |
f587de0e PM |
1833 | if (ret < 0) |
1834 | goto err1; | |
0d53778e | 1835 | pr_debug("nf_ct_h323: init success\n"); |
f587de0e | 1836 | return 0; |
f587de0e | 1837 | err1: |
8a548868 | 1838 | kfree(h323_buffer); |
f587de0e PM |
1839 | return ret; |
1840 | } | |
1841 | ||
f587de0e PM |
1842 | module_init(nf_conntrack_h323_init); |
1843 | module_exit(nf_conntrack_h323_fini); | |
1844 | ||
1845 | EXPORT_SYMBOL_GPL(get_h225_addr); | |
1846 | EXPORT_SYMBOL_GPL(set_h245_addr_hook); | |
1847 | EXPORT_SYMBOL_GPL(set_h225_addr_hook); | |
1848 | EXPORT_SYMBOL_GPL(set_sig_addr_hook); | |
1849 | EXPORT_SYMBOL_GPL(set_ras_addr_hook); | |
1850 | EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); | |
1851 | EXPORT_SYMBOL_GPL(nat_t120_hook); | |
1852 | EXPORT_SYMBOL_GPL(nat_h245_hook); | |
1853 | EXPORT_SYMBOL_GPL(nat_callforwarding_hook); | |
1854 | EXPORT_SYMBOL_GPL(nat_q931_hook); | |
1855 | ||
1856 | MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); | |
1857 | MODULE_DESCRIPTION("H.323 connection tracking helper"); | |
1858 | MODULE_LICENSE("GPL"); | |
1859 | MODULE_ALIAS("ip_conntrack_h323"); | |
be3eed2e PNA |
1860 | MODULE_ALIAS_NFCT_HELPER("RAS"); |
1861 | MODULE_ALIAS_NFCT_HELPER("Q.931"); | |
1862 | MODULE_ALIAS_NFCT_HELPER("H.245"); |