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2bc78049 PM |
1 | /* |
2 | * DCCP connection tracking protocol helper | |
3 | * | |
4 | * Copyright (c) 2005, 2006, 2008 Patrick McHardy <kaber@trash.net> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | */ | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/sysctl.h> | |
15 | #include <linux/spinlock.h> | |
16 | #include <linux/skbuff.h> | |
17 | #include <linux/dccp.h> | |
18 | ||
1546000f CG |
19 | #include <net/net_namespace.h> |
20 | #include <net/netns/generic.h> | |
21 | ||
2bc78049 PM |
22 | #include <linux/netfilter/nfnetlink_conntrack.h> |
23 | #include <net/netfilter/nf_conntrack.h> | |
24 | #include <net/netfilter/nf_conntrack_l4proto.h> | |
b38b1f61 | 25 | #include <net/netfilter/nf_conntrack_ecache.h> |
2bc78049 PM |
26 | #include <net/netfilter/nf_log.h> |
27 | ||
2bc78049 PM |
28 | /* Timeouts are based on values from RFC4340: |
29 | * | |
30 | * - REQUEST: | |
31 | * | |
32 | * 8.1.2. Client Request | |
33 | * | |
34 | * A client MAY give up on its DCCP-Requests after some time | |
35 | * (3 minutes, for example). | |
36 | * | |
37 | * - RESPOND: | |
38 | * | |
39 | * 8.1.3. Server Response | |
40 | * | |
41 | * It MAY also leave the RESPOND state for CLOSED after a timeout of | |
42 | * not less than 4MSL (8 minutes); | |
43 | * | |
44 | * - PARTOPEN: | |
45 | * | |
46 | * 8.1.5. Handshake Completion | |
47 | * | |
48 | * If the client remains in PARTOPEN for more than 4MSL (8 minutes), | |
49 | * it SHOULD reset the connection with Reset Code 2, "Aborted". | |
50 | * | |
51 | * - OPEN: | |
52 | * | |
53 | * The DCCP timestamp overflows after 11.9 hours. If the connection | |
54 | * stays idle this long the sequence number won't be recognized | |
55 | * as valid anymore. | |
56 | * | |
57 | * - CLOSEREQ/CLOSING: | |
58 | * | |
59 | * 8.3. Termination | |
60 | * | |
61 | * The retransmission timer should initially be set to go off in two | |
62 | * round-trip times and should back off to not less than once every | |
63 | * 64 seconds ... | |
64 | * | |
65 | * - TIMEWAIT: | |
66 | * | |
67 | * 4.3. States | |
68 | * | |
69 | * A server or client socket remains in this state for 2MSL (4 minutes) | |
70 | * after the connection has been town down, ... | |
71 | */ | |
72 | ||
73 | #define DCCP_MSL (2 * 60 * HZ) | |
74 | ||
2bc78049 PM |
75 | static const char * const dccp_state_names[] = { |
76 | [CT_DCCP_NONE] = "NONE", | |
77 | [CT_DCCP_REQUEST] = "REQUEST", | |
78 | [CT_DCCP_RESPOND] = "RESPOND", | |
79 | [CT_DCCP_PARTOPEN] = "PARTOPEN", | |
80 | [CT_DCCP_OPEN] = "OPEN", | |
81 | [CT_DCCP_CLOSEREQ] = "CLOSEREQ", | |
82 | [CT_DCCP_CLOSING] = "CLOSING", | |
83 | [CT_DCCP_TIMEWAIT] = "TIMEWAIT", | |
84 | [CT_DCCP_IGNORE] = "IGNORE", | |
85 | [CT_DCCP_INVALID] = "INVALID", | |
86 | }; | |
87 | ||
88 | #define sNO CT_DCCP_NONE | |
89 | #define sRQ CT_DCCP_REQUEST | |
90 | #define sRS CT_DCCP_RESPOND | |
91 | #define sPO CT_DCCP_PARTOPEN | |
92 | #define sOP CT_DCCP_OPEN | |
93 | #define sCR CT_DCCP_CLOSEREQ | |
94 | #define sCG CT_DCCP_CLOSING | |
95 | #define sTW CT_DCCP_TIMEWAIT | |
96 | #define sIG CT_DCCP_IGNORE | |
97 | #define sIV CT_DCCP_INVALID | |
98 | ||
99 | /* | |
100 | * DCCP state transistion table | |
101 | * | |
102 | * The assumption is the same as for TCP tracking: | |
103 | * | |
104 | * We are the man in the middle. All the packets go through us but might | |
105 | * get lost in transit to the destination. It is assumed that the destination | |
106 | * can't receive segments we haven't seen. | |
107 | * | |
108 | * The following states exist: | |
109 | * | |
110 | * NONE: Initial state, expecting Request | |
111 | * REQUEST: Request seen, waiting for Response from server | |
112 | * RESPOND: Response from server seen, waiting for Ack from client | |
113 | * PARTOPEN: Ack after Response seen, waiting for packet other than Response, | |
114 | * Reset or Sync from server | |
115 | * OPEN: Packet other than Response, Reset or Sync seen | |
116 | * CLOSEREQ: CloseReq from server seen, expecting Close from client | |
117 | * CLOSING: Close seen, expecting Reset | |
118 | * TIMEWAIT: Reset seen | |
119 | * IGNORE: Not determinable whether packet is valid | |
120 | * | |
121 | * Some states exist only on one side of the connection: REQUEST, RESPOND, | |
122 | * PARTOPEN, CLOSEREQ. For the other side these states are equivalent to | |
123 | * the one it was in before. | |
124 | * | |
125 | * Packets are marked as ignored (sIG) if we don't know if they're valid | |
126 | * (for example a reincarnation of a connection we didn't notice is dead | |
127 | * already) and the server may send back a connection closing Reset or a | |
128 | * Response. They're also used for Sync/SyncAck packets, which we don't | |
129 | * care about. | |
130 | */ | |
131 | static const u_int8_t | |
132 | dccp_state_table[CT_DCCP_ROLE_MAX + 1][DCCP_PKT_SYNCACK + 1][CT_DCCP_MAX + 1] = { | |
133 | [CT_DCCP_ROLE_CLIENT] = { | |
134 | [DCCP_PKT_REQUEST] = { | |
135 | /* | |
136 | * sNO -> sRQ Regular Request | |
137 | * sRQ -> sRQ Retransmitted Request or reincarnation | |
138 | * sRS -> sRS Retransmitted Request (apparently Response | |
139 | * got lost after we saw it) or reincarnation | |
140 | * sPO -> sIG Ignore, conntrack might be out of sync | |
141 | * sOP -> sIG Ignore, conntrack might be out of sync | |
142 | * sCR -> sIG Ignore, conntrack might be out of sync | |
143 | * sCG -> sIG Ignore, conntrack might be out of sync | |
144 | * sTW -> sRQ Reincarnation | |
145 | * | |
146 | * sNO, sRQ, sRS, sPO. sOP, sCR, sCG, sTW, */ | |
147 | sRQ, sRQ, sRS, sIG, sIG, sIG, sIG, sRQ, | |
148 | }, | |
149 | [DCCP_PKT_RESPONSE] = { | |
150 | /* | |
151 | * sNO -> sIV Invalid | |
152 | * sRQ -> sIG Ignore, might be response to ignored Request | |
153 | * sRS -> sIG Ignore, might be response to ignored Request | |
154 | * sPO -> sIG Ignore, might be response to ignored Request | |
155 | * sOP -> sIG Ignore, might be response to ignored Request | |
156 | * sCR -> sIG Ignore, might be response to ignored Request | |
157 | * sCG -> sIG Ignore, might be response to ignored Request | |
158 | * sTW -> sIV Invalid, reincarnation in reverse direction | |
159 | * goes through sRQ | |
160 | * | |
161 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
162 | sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIV, | |
163 | }, | |
164 | [DCCP_PKT_ACK] = { | |
165 | /* | |
166 | * sNO -> sIV No connection | |
167 | * sRQ -> sIV No connection | |
168 | * sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.) | |
169 | * sPO -> sPO Retransmitted Ack for Response, remain in PARTOPEN | |
170 | * sOP -> sOP Regular ACK, remain in OPEN | |
171 | * sCR -> sCR Ack in CLOSEREQ MAY be processed (8.3.) | |
172 | * sCG -> sCG Ack in CLOSING MAY be processed (8.3.) | |
173 | * sTW -> sIV | |
174 | * | |
175 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
176 | sIV, sIV, sPO, sPO, sOP, sCR, sCG, sIV | |
177 | }, | |
178 | [DCCP_PKT_DATA] = { | |
179 | /* | |
180 | * sNO -> sIV No connection | |
181 | * sRQ -> sIV No connection | |
182 | * sRS -> sIV No connection | |
183 | * sPO -> sIV MUST use DataAck in PARTOPEN state (8.1.5.) | |
184 | * sOP -> sOP Regular Data packet | |
185 | * sCR -> sCR Data in CLOSEREQ MAY be processed (8.3.) | |
186 | * sCG -> sCG Data in CLOSING MAY be processed (8.3.) | |
187 | * sTW -> sIV | |
188 | * | |
189 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
190 | sIV, sIV, sIV, sIV, sOP, sCR, sCG, sIV, | |
191 | }, | |
192 | [DCCP_PKT_DATAACK] = { | |
193 | /* | |
194 | * sNO -> sIV No connection | |
195 | * sRQ -> sIV No connection | |
196 | * sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.) | |
197 | * sPO -> sPO Remain in PARTOPEN state | |
198 | * sOP -> sOP Regular DataAck packet in OPEN state | |
199 | * sCR -> sCR DataAck in CLOSEREQ MAY be processed (8.3.) | |
200 | * sCG -> sCG DataAck in CLOSING MAY be processed (8.3.) | |
201 | * sTW -> sIV | |
202 | * | |
203 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
204 | sIV, sIV, sPO, sPO, sOP, sCR, sCG, sIV | |
205 | }, | |
206 | [DCCP_PKT_CLOSEREQ] = { | |
207 | /* | |
208 | * CLOSEREQ may only be sent by the server. | |
209 | * | |
210 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
211 | sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV | |
212 | }, | |
213 | [DCCP_PKT_CLOSE] = { | |
214 | /* | |
215 | * sNO -> sIV No connection | |
216 | * sRQ -> sIV No connection | |
217 | * sRS -> sIV No connection | |
218 | * sPO -> sCG Client-initiated close | |
219 | * sOP -> sCG Client-initiated close | |
220 | * sCR -> sCG Close in response to CloseReq (8.3.) | |
221 | * sCG -> sCG Retransmit | |
222 | * sTW -> sIV Late retransmit, already in TIME_WAIT | |
223 | * | |
224 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
225 | sIV, sIV, sIV, sCG, sCG, sCG, sIV, sIV | |
226 | }, | |
227 | [DCCP_PKT_RESET] = { | |
228 | /* | |
229 | * sNO -> sIV No connection | |
230 | * sRQ -> sTW Sync received or timeout, SHOULD send Reset (8.1.1.) | |
231 | * sRS -> sTW Response received without Request | |
232 | * sPO -> sTW Timeout, SHOULD send Reset (8.1.5.) | |
233 | * sOP -> sTW Connection reset | |
234 | * sCR -> sTW Connection reset | |
235 | * sCG -> sTW Connection reset | |
236 | * sTW -> sIG Ignore (don't refresh timer) | |
237 | * | |
238 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
239 | sIV, sTW, sTW, sTW, sTW, sTW, sTW, sIG | |
240 | }, | |
241 | [DCCP_PKT_SYNC] = { | |
242 | /* | |
243 | * We currently ignore Sync packets | |
244 | * | |
245 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
246 | sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, | |
247 | }, | |
248 | [DCCP_PKT_SYNCACK] = { | |
249 | /* | |
250 | * We currently ignore SyncAck packets | |
251 | * | |
252 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
253 | sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, | |
254 | }, | |
255 | }, | |
256 | [CT_DCCP_ROLE_SERVER] = { | |
257 | [DCCP_PKT_REQUEST] = { | |
258 | /* | |
259 | * sNO -> sIV Invalid | |
260 | * sRQ -> sIG Ignore, conntrack might be out of sync | |
261 | * sRS -> sIG Ignore, conntrack might be out of sync | |
262 | * sPO -> sIG Ignore, conntrack might be out of sync | |
263 | * sOP -> sIG Ignore, conntrack might be out of sync | |
264 | * sCR -> sIG Ignore, conntrack might be out of sync | |
265 | * sCG -> sIG Ignore, conntrack might be out of sync | |
266 | * sTW -> sRQ Reincarnation, must reverse roles | |
267 | * | |
268 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
269 | sIV, sIG, sIG, sIG, sIG, sIG, sIG, sRQ | |
270 | }, | |
271 | [DCCP_PKT_RESPONSE] = { | |
272 | /* | |
273 | * sNO -> sIV Response without Request | |
274 | * sRQ -> sRS Response to clients Request | |
275 | * sRS -> sRS Retransmitted Response (8.1.3. SHOULD NOT) | |
276 | * sPO -> sIG Response to an ignored Request or late retransmit | |
277 | * sOP -> sIG Ignore, might be response to ignored Request | |
278 | * sCR -> sIG Ignore, might be response to ignored Request | |
279 | * sCG -> sIG Ignore, might be response to ignored Request | |
280 | * sTW -> sIV Invalid, Request from client in sTW moves to sRQ | |
281 | * | |
282 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
283 | sIV, sRS, sRS, sIG, sIG, sIG, sIG, sIV | |
284 | }, | |
285 | [DCCP_PKT_ACK] = { | |
286 | /* | |
287 | * sNO -> sIV No connection | |
288 | * sRQ -> sIV No connection | |
289 | * sRS -> sIV No connection | |
290 | * sPO -> sOP Enter OPEN state (8.1.5.) | |
291 | * sOP -> sOP Regular Ack in OPEN state | |
292 | * sCR -> sIV Waiting for Close from client | |
293 | * sCG -> sCG Ack in CLOSING MAY be processed (8.3.) | |
294 | * sTW -> sIV | |
295 | * | |
296 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
297 | sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV | |
298 | }, | |
299 | [DCCP_PKT_DATA] = { | |
300 | /* | |
301 | * sNO -> sIV No connection | |
302 | * sRQ -> sIV No connection | |
303 | * sRS -> sIV No connection | |
304 | * sPO -> sOP Enter OPEN state (8.1.5.) | |
305 | * sOP -> sOP Regular Data packet in OPEN state | |
306 | * sCR -> sIV Waiting for Close from client | |
307 | * sCG -> sCG Data in CLOSING MAY be processed (8.3.) | |
308 | * sTW -> sIV | |
309 | * | |
310 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
311 | sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV | |
312 | }, | |
313 | [DCCP_PKT_DATAACK] = { | |
314 | /* | |
315 | * sNO -> sIV No connection | |
316 | * sRQ -> sIV No connection | |
317 | * sRS -> sIV No connection | |
318 | * sPO -> sOP Enter OPEN state (8.1.5.) | |
319 | * sOP -> sOP Regular DataAck in OPEN state | |
320 | * sCR -> sIV Waiting for Close from client | |
321 | * sCG -> sCG Data in CLOSING MAY be processed (8.3.) | |
322 | * sTW -> sIV | |
323 | * | |
324 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
325 | sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV | |
326 | }, | |
327 | [DCCP_PKT_CLOSEREQ] = { | |
328 | /* | |
329 | * sNO -> sIV No connection | |
330 | * sRQ -> sIV No connection | |
331 | * sRS -> sIV No connection | |
332 | * sPO -> sOP -> sCR Move directly to CLOSEREQ (8.1.5.) | |
333 | * sOP -> sCR CloseReq in OPEN state | |
334 | * sCR -> sCR Retransmit | |
335 | * sCG -> sCR Simultaneous close, client sends another Close | |
336 | * sTW -> sIV Already closed | |
337 | * | |
338 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
339 | sIV, sIV, sIV, sCR, sCR, sCR, sCR, sIV | |
340 | }, | |
341 | [DCCP_PKT_CLOSE] = { | |
342 | /* | |
343 | * sNO -> sIV No connection | |
344 | * sRQ -> sIV No connection | |
345 | * sRS -> sIV No connection | |
346 | * sPO -> sOP -> sCG Move direcly to CLOSING | |
347 | * sOP -> sCG Move to CLOSING | |
348 | * sCR -> sIV Close after CloseReq is invalid | |
349 | * sCG -> sCG Retransmit | |
350 | * sTW -> sIV Already closed | |
351 | * | |
352 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
353 | sIV, sIV, sIV, sCG, sCG, sIV, sCG, sIV | |
354 | }, | |
355 | [DCCP_PKT_RESET] = { | |
356 | /* | |
357 | * sNO -> sIV No connection | |
358 | * sRQ -> sTW Reset in response to Request | |
359 | * sRS -> sTW Timeout, SHOULD send Reset (8.1.3.) | |
360 | * sPO -> sTW Timeout, SHOULD send Reset (8.1.3.) | |
361 | * sOP -> sTW | |
362 | * sCR -> sTW | |
363 | * sCG -> sTW | |
364 | * sTW -> sIG Ignore (don't refresh timer) | |
365 | * | |
366 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW, sTW */ | |
367 | sIV, sTW, sTW, sTW, sTW, sTW, sTW, sTW, sIG | |
368 | }, | |
369 | [DCCP_PKT_SYNC] = { | |
370 | /* | |
371 | * We currently ignore Sync packets | |
372 | * | |
373 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
374 | sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, | |
375 | }, | |
376 | [DCCP_PKT_SYNCACK] = { | |
377 | /* | |
378 | * We currently ignore SyncAck packets | |
379 | * | |
380 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ | |
381 | sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, | |
382 | }, | |
383 | }, | |
384 | }; | |
385 | ||
1546000f CG |
386 | /* this module per-net specifics */ |
387 | static int dccp_net_id; | |
388 | struct dccp_net { | |
389 | int dccp_loose; | |
390 | unsigned int dccp_timeout[CT_DCCP_MAX + 1]; | |
391 | #ifdef CONFIG_SYSCTL | |
392 | struct ctl_table_header *sysctl_header; | |
393 | struct ctl_table *sysctl_table; | |
394 | #endif | |
395 | }; | |
396 | ||
397 | static inline struct dccp_net *dccp_pernet(struct net *net) | |
398 | { | |
399 | return net_generic(net, dccp_net_id); | |
400 | } | |
401 | ||
09f263cd JE |
402 | static bool dccp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff, |
403 | struct nf_conntrack_tuple *tuple) | |
2bc78049 PM |
404 | { |
405 | struct dccp_hdr _hdr, *dh; | |
406 | ||
407 | dh = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); | |
408 | if (dh == NULL) | |
09f263cd | 409 | return false; |
2bc78049 PM |
410 | |
411 | tuple->src.u.dccp.port = dh->dccph_sport; | |
412 | tuple->dst.u.dccp.port = dh->dccph_dport; | |
09f263cd | 413 | return true; |
2bc78049 PM |
414 | } |
415 | ||
09f263cd JE |
416 | static bool dccp_invert_tuple(struct nf_conntrack_tuple *inv, |
417 | const struct nf_conntrack_tuple *tuple) | |
2bc78049 PM |
418 | { |
419 | inv->src.u.dccp.port = tuple->dst.u.dccp.port; | |
420 | inv->dst.u.dccp.port = tuple->src.u.dccp.port; | |
09f263cd | 421 | return true; |
2bc78049 PM |
422 | } |
423 | ||
09f263cd JE |
424 | static bool dccp_new(struct nf_conn *ct, const struct sk_buff *skb, |
425 | unsigned int dataoff) | |
2bc78049 | 426 | { |
c2a2c7e0 | 427 | struct net *net = nf_ct_net(ct); |
1546000f | 428 | struct dccp_net *dn; |
2bc78049 PM |
429 | struct dccp_hdr _dh, *dh; |
430 | const char *msg; | |
431 | u_int8_t state; | |
432 | ||
433 | dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); | |
434 | BUG_ON(dh == NULL); | |
435 | ||
436 | state = dccp_state_table[CT_DCCP_ROLE_CLIENT][dh->dccph_type][CT_DCCP_NONE]; | |
437 | switch (state) { | |
438 | default: | |
1546000f CG |
439 | dn = dccp_pernet(net); |
440 | if (dn->dccp_loose == 0) { | |
2bc78049 PM |
441 | msg = "nf_ct_dccp: not picking up existing connection "; |
442 | goto out_invalid; | |
443 | } | |
444 | case CT_DCCP_REQUEST: | |
445 | break; | |
446 | case CT_DCCP_INVALID: | |
447 | msg = "nf_ct_dccp: invalid state transition "; | |
448 | goto out_invalid; | |
449 | } | |
450 | ||
451 | ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT; | |
452 | ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER; | |
453 | ct->proto.dccp.state = CT_DCCP_NONE; | |
09f263cd | 454 | return true; |
2bc78049 PM |
455 | |
456 | out_invalid: | |
c2a2c7e0 | 457 | if (LOG_INVALID(net, IPPROTO_DCCP)) |
5e8fbe2a | 458 | nf_log_packet(nf_ct_l3num(ct), 0, skb, NULL, NULL, NULL, msg); |
09f263cd | 459 | return false; |
2bc78049 PM |
460 | } |
461 | ||
462 | static u64 dccp_ack_seq(const struct dccp_hdr *dh) | |
463 | { | |
464 | const struct dccp_hdr_ack_bits *dhack; | |
465 | ||
466 | dhack = (void *)dh + __dccp_basic_hdr_len(dh); | |
467 | return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + | |
468 | ntohl(dhack->dccph_ack_nr_low); | |
469 | } | |
470 | ||
471 | static int dccp_packet(struct nf_conn *ct, const struct sk_buff *skb, | |
472 | unsigned int dataoff, enum ip_conntrack_info ctinfo, | |
76108cea | 473 | u_int8_t pf, unsigned int hooknum) |
2bc78049 | 474 | { |
c2a2c7e0 | 475 | struct net *net = nf_ct_net(ct); |
1546000f | 476 | struct dccp_net *dn; |
2bc78049 PM |
477 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
478 | struct dccp_hdr _dh, *dh; | |
479 | u_int8_t type, old_state, new_state; | |
480 | enum ct_dccp_roles role; | |
481 | ||
482 | dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); | |
483 | BUG_ON(dh == NULL); | |
484 | type = dh->dccph_type; | |
485 | ||
486 | if (type == DCCP_PKT_RESET && | |
487 | !test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { | |
488 | /* Tear down connection immediately if only reply is a RESET */ | |
718d4ad9 | 489 | nf_ct_kill_acct(ct, ctinfo, skb); |
2bc78049 PM |
490 | return NF_ACCEPT; |
491 | } | |
492 | ||
440f0d58 | 493 | spin_lock_bh(&ct->lock); |
2bc78049 PM |
494 | |
495 | role = ct->proto.dccp.role[dir]; | |
496 | old_state = ct->proto.dccp.state; | |
497 | new_state = dccp_state_table[role][type][old_state]; | |
498 | ||
499 | switch (new_state) { | |
500 | case CT_DCCP_REQUEST: | |
501 | if (old_state == CT_DCCP_TIMEWAIT && | |
502 | role == CT_DCCP_ROLE_SERVER) { | |
503 | /* Reincarnation in the reverse direction: reopen and | |
504 | * reverse client/server roles. */ | |
505 | ct->proto.dccp.role[dir] = CT_DCCP_ROLE_CLIENT; | |
506 | ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_SERVER; | |
507 | } | |
508 | break; | |
509 | case CT_DCCP_RESPOND: | |
510 | if (old_state == CT_DCCP_REQUEST) | |
511 | ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh); | |
512 | break; | |
513 | case CT_DCCP_PARTOPEN: | |
514 | if (old_state == CT_DCCP_RESPOND && | |
515 | type == DCCP_PKT_ACK && | |
516 | dccp_ack_seq(dh) == ct->proto.dccp.handshake_seq) | |
517 | set_bit(IPS_ASSURED_BIT, &ct->status); | |
518 | break; | |
519 | case CT_DCCP_IGNORE: | |
520 | /* | |
521 | * Connection tracking might be out of sync, so we ignore | |
522 | * packets that might establish a new connection and resync | |
523 | * if the server responds with a valid Response. | |
524 | */ | |
525 | if (ct->proto.dccp.last_dir == !dir && | |
526 | ct->proto.dccp.last_pkt == DCCP_PKT_REQUEST && | |
527 | type == DCCP_PKT_RESPONSE) { | |
528 | ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_CLIENT; | |
529 | ct->proto.dccp.role[dir] = CT_DCCP_ROLE_SERVER; | |
530 | ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh); | |
531 | new_state = CT_DCCP_RESPOND; | |
532 | break; | |
533 | } | |
534 | ct->proto.dccp.last_dir = dir; | |
535 | ct->proto.dccp.last_pkt = type; | |
536 | ||
440f0d58 | 537 | spin_unlock_bh(&ct->lock); |
c2a2c7e0 | 538 | if (LOG_INVALID(net, IPPROTO_DCCP)) |
2bc78049 PM |
539 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
540 | "nf_ct_dccp: invalid packet ignored "); | |
541 | return NF_ACCEPT; | |
542 | case CT_DCCP_INVALID: | |
440f0d58 | 543 | spin_unlock_bh(&ct->lock); |
c2a2c7e0 | 544 | if (LOG_INVALID(net, IPPROTO_DCCP)) |
2bc78049 PM |
545 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
546 | "nf_ct_dccp: invalid state transition "); | |
547 | return -NF_ACCEPT; | |
548 | } | |
549 | ||
550 | ct->proto.dccp.last_dir = dir; | |
551 | ct->proto.dccp.last_pkt = type; | |
552 | ct->proto.dccp.state = new_state; | |
440f0d58 | 553 | spin_unlock_bh(&ct->lock); |
1546000f | 554 | |
b38b1f61 PNA |
555 | if (new_state != old_state) |
556 | nf_conntrack_event_cache(IPCT_PROTOINFO, ct); | |
557 | ||
1546000f CG |
558 | dn = dccp_pernet(net); |
559 | nf_ct_refresh_acct(ct, ctinfo, skb, dn->dccp_timeout[new_state]); | |
2bc78049 PM |
560 | |
561 | return NF_ACCEPT; | |
562 | } | |
563 | ||
74c51a14 AD |
564 | static int dccp_error(struct net *net, struct sk_buff *skb, |
565 | unsigned int dataoff, enum ip_conntrack_info *ctinfo, | |
566 | u_int8_t pf, unsigned int hooknum) | |
2bc78049 PM |
567 | { |
568 | struct dccp_hdr _dh, *dh; | |
569 | unsigned int dccp_len = skb->len - dataoff; | |
570 | unsigned int cscov; | |
571 | const char *msg; | |
572 | ||
573 | dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); | |
574 | if (dh == NULL) { | |
575 | msg = "nf_ct_dccp: short packet "; | |
576 | goto out_invalid; | |
577 | } | |
578 | ||
579 | if (dh->dccph_doff * 4 < sizeof(struct dccp_hdr) || | |
580 | dh->dccph_doff * 4 > dccp_len) { | |
581 | msg = "nf_ct_dccp: truncated/malformed packet "; | |
582 | goto out_invalid; | |
583 | } | |
584 | ||
585 | cscov = dccp_len; | |
586 | if (dh->dccph_cscov) { | |
587 | cscov = (dh->dccph_cscov - 1) * 4; | |
588 | if (cscov > dccp_len) { | |
589 | msg = "nf_ct_dccp: bad checksum coverage "; | |
590 | goto out_invalid; | |
591 | } | |
592 | } | |
593 | ||
c04d0552 | 594 | if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && |
2bc78049 PM |
595 | nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_DCCP, |
596 | pf)) { | |
597 | msg = "nf_ct_dccp: bad checksum "; | |
598 | goto out_invalid; | |
599 | } | |
600 | ||
601 | if (dh->dccph_type >= DCCP_PKT_INVALID) { | |
602 | msg = "nf_ct_dccp: reserved packet type "; | |
603 | goto out_invalid; | |
604 | } | |
605 | ||
606 | return NF_ACCEPT; | |
607 | ||
608 | out_invalid: | |
c2a2c7e0 | 609 | if (LOG_INVALID(net, IPPROTO_DCCP)) |
2bc78049 PM |
610 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, msg); |
611 | return -NF_ACCEPT; | |
612 | } | |
613 | ||
614 | static int dccp_print_tuple(struct seq_file *s, | |
615 | const struct nf_conntrack_tuple *tuple) | |
616 | { | |
617 | return seq_printf(s, "sport=%hu dport=%hu ", | |
618 | ntohs(tuple->src.u.dccp.port), | |
619 | ntohs(tuple->dst.u.dccp.port)); | |
620 | } | |
621 | ||
440f0d58 | 622 | static int dccp_print_conntrack(struct seq_file *s, struct nf_conn *ct) |
2bc78049 PM |
623 | { |
624 | return seq_printf(s, "%s ", dccp_state_names[ct->proto.dccp.state]); | |
625 | } | |
626 | ||
627 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) | |
628 | static int dccp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, | |
440f0d58 | 629 | struct nf_conn *ct) |
2bc78049 PM |
630 | { |
631 | struct nlattr *nest_parms; | |
632 | ||
440f0d58 | 633 | spin_lock_bh(&ct->lock); |
2bc78049 PM |
634 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_DCCP | NLA_F_NESTED); |
635 | if (!nest_parms) | |
636 | goto nla_put_failure; | |
637 | NLA_PUT_U8(skb, CTA_PROTOINFO_DCCP_STATE, ct->proto.dccp.state); | |
71951b64 PNA |
638 | NLA_PUT_U8(skb, CTA_PROTOINFO_DCCP_ROLE, |
639 | ct->proto.dccp.role[IP_CT_DIR_ORIGINAL]); | |
a17c8598 PNA |
640 | NLA_PUT_BE64(skb, CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ, |
641 | cpu_to_be64(ct->proto.dccp.handshake_seq)); | |
2bc78049 | 642 | nla_nest_end(skb, nest_parms); |
440f0d58 | 643 | spin_unlock_bh(&ct->lock); |
2bc78049 PM |
644 | return 0; |
645 | ||
646 | nla_put_failure: | |
440f0d58 | 647 | spin_unlock_bh(&ct->lock); |
2bc78049 PM |
648 | return -1; |
649 | } | |
650 | ||
651 | static const struct nla_policy dccp_nla_policy[CTA_PROTOINFO_DCCP_MAX + 1] = { | |
652 | [CTA_PROTOINFO_DCCP_STATE] = { .type = NLA_U8 }, | |
71951b64 | 653 | [CTA_PROTOINFO_DCCP_ROLE] = { .type = NLA_U8 }, |
a17c8598 | 654 | [CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ] = { .type = NLA_U64 }, |
2bc78049 PM |
655 | }; |
656 | ||
657 | static int nlattr_to_dccp(struct nlattr *cda[], struct nf_conn *ct) | |
658 | { | |
659 | struct nlattr *attr = cda[CTA_PROTOINFO_DCCP]; | |
660 | struct nlattr *tb[CTA_PROTOINFO_DCCP_MAX + 1]; | |
661 | int err; | |
662 | ||
663 | if (!attr) | |
664 | return 0; | |
665 | ||
666 | err = nla_parse_nested(tb, CTA_PROTOINFO_DCCP_MAX, attr, | |
667 | dccp_nla_policy); | |
668 | if (err < 0) | |
669 | return err; | |
670 | ||
671 | if (!tb[CTA_PROTOINFO_DCCP_STATE] || | |
71951b64 PNA |
672 | !tb[CTA_PROTOINFO_DCCP_ROLE] || |
673 | nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) > CT_DCCP_ROLE_MAX || | |
674 | nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]) >= CT_DCCP_IGNORE) { | |
2bc78049 | 675 | return -EINVAL; |
71951b64 | 676 | } |
2bc78049 | 677 | |
440f0d58 | 678 | spin_lock_bh(&ct->lock); |
2bc78049 | 679 | ct->proto.dccp.state = nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]); |
71951b64 PNA |
680 | if (nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) == CT_DCCP_ROLE_CLIENT) { |
681 | ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT; | |
682 | ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER; | |
683 | } else { | |
684 | ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_SERVER; | |
685 | ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_CLIENT; | |
686 | } | |
a17c8598 PNA |
687 | if (tb[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ]) { |
688 | ct->proto.dccp.handshake_seq = | |
689 | be64_to_cpu(nla_get_be64(tb[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ])); | |
690 | } | |
440f0d58 | 691 | spin_unlock_bh(&ct->lock); |
2bc78049 PM |
692 | return 0; |
693 | } | |
a400c30e HE |
694 | |
695 | static int dccp_nlattr_size(void) | |
696 | { | |
697 | return nla_total_size(0) /* CTA_PROTOINFO_DCCP */ | |
698 | + nla_policy_len(dccp_nla_policy, CTA_PROTOINFO_DCCP_MAX + 1); | |
699 | } | |
2bc78049 PM |
700 | #endif |
701 | ||
702 | #ifdef CONFIG_SYSCTL | |
1546000f CG |
703 | /* template, data assigned later */ |
704 | static struct ctl_table dccp_sysctl_table[] = { | |
2bc78049 PM |
705 | { |
706 | .ctl_name = CTL_UNNUMBERED, | |
707 | .procname = "nf_conntrack_dccp_timeout_request", | |
2bc78049 PM |
708 | .maxlen = sizeof(unsigned int), |
709 | .mode = 0644, | |
710 | .proc_handler = proc_dointvec_jiffies, | |
711 | }, | |
712 | { | |
713 | .ctl_name = CTL_UNNUMBERED, | |
714 | .procname = "nf_conntrack_dccp_timeout_respond", | |
2bc78049 PM |
715 | .maxlen = sizeof(unsigned int), |
716 | .mode = 0644, | |
717 | .proc_handler = proc_dointvec_jiffies, | |
718 | }, | |
719 | { | |
720 | .ctl_name = CTL_UNNUMBERED, | |
721 | .procname = "nf_conntrack_dccp_timeout_partopen", | |
2bc78049 PM |
722 | .maxlen = sizeof(unsigned int), |
723 | .mode = 0644, | |
724 | .proc_handler = proc_dointvec_jiffies, | |
725 | }, | |
726 | { | |
727 | .ctl_name = CTL_UNNUMBERED, | |
728 | .procname = "nf_conntrack_dccp_timeout_open", | |
2bc78049 PM |
729 | .maxlen = sizeof(unsigned int), |
730 | .mode = 0644, | |
731 | .proc_handler = proc_dointvec_jiffies, | |
732 | }, | |
733 | { | |
734 | .ctl_name = CTL_UNNUMBERED, | |
735 | .procname = "nf_conntrack_dccp_timeout_closereq", | |
2bc78049 PM |
736 | .maxlen = sizeof(unsigned int), |
737 | .mode = 0644, | |
738 | .proc_handler = proc_dointvec_jiffies, | |
739 | }, | |
740 | { | |
741 | .ctl_name = CTL_UNNUMBERED, | |
742 | .procname = "nf_conntrack_dccp_timeout_closing", | |
2bc78049 PM |
743 | .maxlen = sizeof(unsigned int), |
744 | .mode = 0644, | |
745 | .proc_handler = proc_dointvec_jiffies, | |
746 | }, | |
747 | { | |
748 | .ctl_name = CTL_UNNUMBERED, | |
749 | .procname = "nf_conntrack_dccp_timeout_timewait", | |
2bc78049 PM |
750 | .maxlen = sizeof(unsigned int), |
751 | .mode = 0644, | |
752 | .proc_handler = proc_dointvec_jiffies, | |
753 | }, | |
754 | { | |
755 | .ctl_name = CTL_UNNUMBERED, | |
756 | .procname = "nf_conntrack_dccp_loose", | |
1546000f | 757 | .maxlen = sizeof(int), |
2bc78049 PM |
758 | .mode = 0644, |
759 | .proc_handler = proc_dointvec, | |
760 | }, | |
761 | { | |
762 | .ctl_name = 0, | |
763 | } | |
764 | }; | |
765 | #endif /* CONFIG_SYSCTL */ | |
766 | ||
767 | static struct nf_conntrack_l4proto dccp_proto4 __read_mostly = { | |
768 | .l3proto = AF_INET, | |
769 | .l4proto = IPPROTO_DCCP, | |
770 | .name = "dccp", | |
771 | .pkt_to_tuple = dccp_pkt_to_tuple, | |
772 | .invert_tuple = dccp_invert_tuple, | |
773 | .new = dccp_new, | |
774 | .packet = dccp_packet, | |
775 | .error = dccp_error, | |
776 | .print_tuple = dccp_print_tuple, | |
777 | .print_conntrack = dccp_print_conntrack, | |
778 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) | |
779 | .to_nlattr = dccp_to_nlattr, | |
a400c30e | 780 | .nlattr_size = dccp_nlattr_size, |
2bc78049 PM |
781 | .from_nlattr = nlattr_to_dccp, |
782 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, | |
a400c30e | 783 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
2bc78049 PM |
784 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
785 | .nla_policy = nf_ct_port_nla_policy, | |
786 | #endif | |
2bc78049 PM |
787 | }; |
788 | ||
789 | static struct nf_conntrack_l4proto dccp_proto6 __read_mostly = { | |
790 | .l3proto = AF_INET6, | |
791 | .l4proto = IPPROTO_DCCP, | |
792 | .name = "dccp", | |
793 | .pkt_to_tuple = dccp_pkt_to_tuple, | |
794 | .invert_tuple = dccp_invert_tuple, | |
795 | .new = dccp_new, | |
796 | .packet = dccp_packet, | |
797 | .error = dccp_error, | |
798 | .print_tuple = dccp_print_tuple, | |
799 | .print_conntrack = dccp_print_conntrack, | |
800 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) | |
801 | .to_nlattr = dccp_to_nlattr, | |
5ff48294 | 802 | .nlattr_size = dccp_nlattr_size, |
2bc78049 PM |
803 | .from_nlattr = nlattr_to_dccp, |
804 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, | |
a400c30e | 805 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
2bc78049 PM |
806 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
807 | .nla_policy = nf_ct_port_nla_policy, | |
808 | #endif | |
1546000f CG |
809 | }; |
810 | ||
811 | static __net_init int dccp_net_init(struct net *net) | |
812 | { | |
813 | struct dccp_net *dn; | |
814 | int err; | |
815 | ||
816 | dn = kmalloc(sizeof(*dn), GFP_KERNEL); | |
817 | if (!dn) | |
818 | return -ENOMEM; | |
819 | ||
820 | /* default values */ | |
821 | dn->dccp_loose = 1; | |
822 | dn->dccp_timeout[CT_DCCP_REQUEST] = 2 * DCCP_MSL; | |
823 | dn->dccp_timeout[CT_DCCP_RESPOND] = 4 * DCCP_MSL; | |
824 | dn->dccp_timeout[CT_DCCP_PARTOPEN] = 4 * DCCP_MSL; | |
825 | dn->dccp_timeout[CT_DCCP_OPEN] = 12 * 3600 * HZ; | |
826 | dn->dccp_timeout[CT_DCCP_CLOSEREQ] = 64 * HZ; | |
827 | dn->dccp_timeout[CT_DCCP_CLOSING] = 64 * HZ; | |
828 | dn->dccp_timeout[CT_DCCP_TIMEWAIT] = 2 * DCCP_MSL; | |
829 | ||
830 | err = net_assign_generic(net, dccp_net_id, dn); | |
831 | if (err) | |
832 | goto out; | |
833 | ||
2bc78049 | 834 | #ifdef CONFIG_SYSCTL |
1546000f CG |
835 | err = -ENOMEM; |
836 | dn->sysctl_table = kmemdup(dccp_sysctl_table, | |
837 | sizeof(dccp_sysctl_table), GFP_KERNEL); | |
838 | if (!dn->sysctl_table) | |
839 | goto out; | |
840 | ||
841 | dn->sysctl_table[0].data = &dn->dccp_timeout[CT_DCCP_REQUEST]; | |
842 | dn->sysctl_table[1].data = &dn->dccp_timeout[CT_DCCP_RESPOND]; | |
843 | dn->sysctl_table[2].data = &dn->dccp_timeout[CT_DCCP_PARTOPEN]; | |
844 | dn->sysctl_table[3].data = &dn->dccp_timeout[CT_DCCP_OPEN]; | |
845 | dn->sysctl_table[4].data = &dn->dccp_timeout[CT_DCCP_CLOSEREQ]; | |
846 | dn->sysctl_table[5].data = &dn->dccp_timeout[CT_DCCP_CLOSING]; | |
847 | dn->sysctl_table[6].data = &dn->dccp_timeout[CT_DCCP_TIMEWAIT]; | |
848 | dn->sysctl_table[7].data = &dn->dccp_loose; | |
849 | ||
850 | dn->sysctl_header = register_net_sysctl_table(net, | |
851 | nf_net_netfilter_sysctl_path, dn->sysctl_table); | |
852 | if (!dn->sysctl_header) { | |
853 | kfree(dn->sysctl_table); | |
854 | goto out; | |
855 | } | |
2bc78049 | 856 | #endif |
1546000f CG |
857 | |
858 | return 0; | |
859 | ||
860 | out: | |
861 | kfree(dn); | |
862 | return err; | |
863 | } | |
864 | ||
865 | static __net_exit void dccp_net_exit(struct net *net) | |
866 | { | |
867 | struct dccp_net *dn = dccp_pernet(net); | |
868 | #ifdef CONFIG_SYSCTL | |
869 | unregister_net_sysctl_table(dn->sysctl_header); | |
870 | kfree(dn->sysctl_table); | |
871 | #endif | |
872 | kfree(dn); | |
873 | ||
874 | net_assign_generic(net, dccp_net_id, NULL); | |
875 | } | |
876 | ||
877 | static struct pernet_operations dccp_net_ops = { | |
878 | .init = dccp_net_init, | |
879 | .exit = dccp_net_exit, | |
2bc78049 PM |
880 | }; |
881 | ||
882 | static int __init nf_conntrack_proto_dccp_init(void) | |
883 | { | |
884 | int err; | |
885 | ||
1546000f | 886 | err = register_pernet_gen_subsys(&dccp_net_id, &dccp_net_ops); |
2bc78049 PM |
887 | if (err < 0) |
888 | goto err1; | |
889 | ||
1546000f | 890 | err = nf_conntrack_l4proto_register(&dccp_proto4); |
2bc78049 PM |
891 | if (err < 0) |
892 | goto err2; | |
1546000f CG |
893 | |
894 | err = nf_conntrack_l4proto_register(&dccp_proto6); | |
895 | if (err < 0) | |
896 | goto err3; | |
2bc78049 PM |
897 | return 0; |
898 | ||
1546000f | 899 | err3: |
2bc78049 | 900 | nf_conntrack_l4proto_unregister(&dccp_proto4); |
1546000f CG |
901 | err2: |
902 | unregister_pernet_gen_subsys(dccp_net_id, &dccp_net_ops); | |
2bc78049 PM |
903 | err1: |
904 | return err; | |
905 | } | |
906 | ||
907 | static void __exit nf_conntrack_proto_dccp_fini(void) | |
908 | { | |
1546000f | 909 | unregister_pernet_gen_subsys(dccp_net_id, &dccp_net_ops); |
2bc78049 PM |
910 | nf_conntrack_l4proto_unregister(&dccp_proto6); |
911 | nf_conntrack_l4proto_unregister(&dccp_proto4); | |
912 | } | |
913 | ||
914 | module_init(nf_conntrack_proto_dccp_init); | |
915 | module_exit(nf_conntrack_proto_dccp_fini); | |
916 | ||
917 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
918 | MODULE_DESCRIPTION("DCCP connection tracking protocol helper"); | |
919 | MODULE_LICENSE("GPL"); |