Root/
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 | #include <linux/slab.h> |
19 | |
20 | #include <net/net_namespace.h> |
21 | #include <net/netns/generic.h> |
22 | |
23 | #include <linux/netfilter/nfnetlink_conntrack.h> |
24 | #include <net/netfilter/nf_conntrack.h> |
25 | #include <net/netfilter/nf_conntrack_l4proto.h> |
26 | #include <net/netfilter/nf_conntrack_ecache.h> |
27 | #include <net/netfilter/nf_log.h> |
28 | |
29 | /* Timeouts are based on values from RFC4340: |
30 | * |
31 | * - REQUEST: |
32 | * |
33 | * 8.1.2. Client Request |
34 | * |
35 | * A client MAY give up on its DCCP-Requests after some time |
36 | * (3 minutes, for example). |
37 | * |
38 | * - RESPOND: |
39 | * |
40 | * 8.1.3. Server Response |
41 | * |
42 | * It MAY also leave the RESPOND state for CLOSED after a timeout of |
43 | * not less than 4MSL (8 minutes); |
44 | * |
45 | * - PARTOPEN: |
46 | * |
47 | * 8.1.5. Handshake Completion |
48 | * |
49 | * If the client remains in PARTOPEN for more than 4MSL (8 minutes), |
50 | * it SHOULD reset the connection with Reset Code 2, "Aborted". |
51 | * |
52 | * - OPEN: |
53 | * |
54 | * The DCCP timestamp overflows after 11.9 hours. If the connection |
55 | * stays idle this long the sequence number won't be recognized |
56 | * as valid anymore. |
57 | * |
58 | * - CLOSEREQ/CLOSING: |
59 | * |
60 | * 8.3. Termination |
61 | * |
62 | * The retransmission timer should initially be set to go off in two |
63 | * round-trip times and should back off to not less than once every |
64 | * 64 seconds ... |
65 | * |
66 | * - TIMEWAIT: |
67 | * |
68 | * 4.3. States |
69 | * |
70 | * A server or client socket remains in this state for 2MSL (4 minutes) |
71 | * after the connection has been town down, ... |
72 | */ |
73 | |
74 | #define DCCP_MSL (2 * 60 * HZ) |
75 | |
76 | static const char * const dccp_state_names[] = { |
77 | [CT_DCCP_NONE] = "NONE", |
78 | [CT_DCCP_REQUEST] = "REQUEST", |
79 | [CT_DCCP_RESPOND] = "RESPOND", |
80 | [CT_DCCP_PARTOPEN] = "PARTOPEN", |
81 | [CT_DCCP_OPEN] = "OPEN", |
82 | [CT_DCCP_CLOSEREQ] = "CLOSEREQ", |
83 | [CT_DCCP_CLOSING] = "CLOSING", |
84 | [CT_DCCP_TIMEWAIT] = "TIMEWAIT", |
85 | [CT_DCCP_IGNORE] = "IGNORE", |
86 | [CT_DCCP_INVALID] = "INVALID", |
87 | }; |
88 | |
89 | #define sNO CT_DCCP_NONE |
90 | #define sRQ CT_DCCP_REQUEST |
91 | #define sRS CT_DCCP_RESPOND |
92 | #define sPO CT_DCCP_PARTOPEN |
93 | #define sOP CT_DCCP_OPEN |
94 | #define sCR CT_DCCP_CLOSEREQ |
95 | #define sCG CT_DCCP_CLOSING |
96 | #define sTW CT_DCCP_TIMEWAIT |
97 | #define sIG CT_DCCP_IGNORE |
98 | #define sIV CT_DCCP_INVALID |
99 | |
100 | /* |
101 | * DCCP state transition table |
102 | * |
103 | * The assumption is the same as for TCP tracking: |
104 | * |
105 | * We are the man in the middle. All the packets go through us but might |
106 | * get lost in transit to the destination. It is assumed that the destination |
107 | * can't receive segments we haven't seen. |
108 | * |
109 | * The following states exist: |
110 | * |
111 | * NONE: Initial state, expecting Request |
112 | * REQUEST: Request seen, waiting for Response from server |
113 | * RESPOND: Response from server seen, waiting for Ack from client |
114 | * PARTOPEN: Ack after Response seen, waiting for packet other than Response, |
115 | * Reset or Sync from server |
116 | * OPEN: Packet other than Response, Reset or Sync seen |
117 | * CLOSEREQ: CloseReq from server seen, expecting Close from client |
118 | * CLOSING: Close seen, expecting Reset |
119 | * TIMEWAIT: Reset seen |
120 | * IGNORE: Not determinable whether packet is valid |
121 | * |
122 | * Some states exist only on one side of the connection: REQUEST, RESPOND, |
123 | * PARTOPEN, CLOSEREQ. For the other side these states are equivalent to |
124 | * the one it was in before. |
125 | * |
126 | * Packets are marked as ignored (sIG) if we don't know if they're valid |
127 | * (for example a reincarnation of a connection we didn't notice is dead |
128 | * already) and the server may send back a connection closing Reset or a |
129 | * Response. They're also used for Sync/SyncAck packets, which we don't |
130 | * care about. |
131 | */ |
132 | static const u_int8_t |
133 | dccp_state_table[CT_DCCP_ROLE_MAX + 1][DCCP_PKT_SYNCACK + 1][CT_DCCP_MAX + 1] = { |
134 | [CT_DCCP_ROLE_CLIENT] = { |
135 | [DCCP_PKT_REQUEST] = { |
136 | /* |
137 | * sNO -> sRQ Regular Request |
138 | * sRQ -> sRQ Retransmitted Request or reincarnation |
139 | * sRS -> sRS Retransmitted Request (apparently Response |
140 | * got lost after we saw it) or reincarnation |
141 | * sPO -> sIG Ignore, conntrack might be out of sync |
142 | * sOP -> sIG Ignore, conntrack might be out of sync |
143 | * sCR -> sIG Ignore, conntrack might be out of sync |
144 | * sCG -> sIG Ignore, conntrack might be out of sync |
145 | * sTW -> sRQ Reincarnation |
146 | * |
147 | * sNO, sRQ, sRS, sPO. sOP, sCR, sCG, sTW, */ |
148 | sRQ, sRQ, sRS, sIG, sIG, sIG, sIG, sRQ, |
149 | }, |
150 | [DCCP_PKT_RESPONSE] = { |
151 | /* |
152 | * sNO -> sIV Invalid |
153 | * sRQ -> sIG Ignore, might be response to ignored Request |
154 | * sRS -> sIG Ignore, might be response to ignored Request |
155 | * sPO -> sIG Ignore, might be response to ignored Request |
156 | * sOP -> sIG Ignore, might be response to ignored Request |
157 | * sCR -> sIG Ignore, might be response to ignored Request |
158 | * sCG -> sIG Ignore, might be response to ignored Request |
159 | * sTW -> sIV Invalid, reincarnation in reverse direction |
160 | * goes through sRQ |
161 | * |
162 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
163 | sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIV, |
164 | }, |
165 | [DCCP_PKT_ACK] = { |
166 | /* |
167 | * sNO -> sIV No connection |
168 | * sRQ -> sIV No connection |
169 | * sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.) |
170 | * sPO -> sPO Retransmitted Ack for Response, remain in PARTOPEN |
171 | * sOP -> sOP Regular ACK, remain in OPEN |
172 | * sCR -> sCR Ack in CLOSEREQ MAY be processed (8.3.) |
173 | * sCG -> sCG Ack in CLOSING MAY be processed (8.3.) |
174 | * sTW -> sIV |
175 | * |
176 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
177 | sIV, sIV, sPO, sPO, sOP, sCR, sCG, sIV |
178 | }, |
179 | [DCCP_PKT_DATA] = { |
180 | /* |
181 | * sNO -> sIV No connection |
182 | * sRQ -> sIV No connection |
183 | * sRS -> sIV No connection |
184 | * sPO -> sIV MUST use DataAck in PARTOPEN state (8.1.5.) |
185 | * sOP -> sOP Regular Data packet |
186 | * sCR -> sCR Data in CLOSEREQ MAY be processed (8.3.) |
187 | * sCG -> sCG Data in CLOSING MAY be processed (8.3.) |
188 | * sTW -> sIV |
189 | * |
190 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
191 | sIV, sIV, sIV, sIV, sOP, sCR, sCG, sIV, |
192 | }, |
193 | [DCCP_PKT_DATAACK] = { |
194 | /* |
195 | * sNO -> sIV No connection |
196 | * sRQ -> sIV No connection |
197 | * sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.) |
198 | * sPO -> sPO Remain in PARTOPEN state |
199 | * sOP -> sOP Regular DataAck packet in OPEN state |
200 | * sCR -> sCR DataAck in CLOSEREQ MAY be processed (8.3.) |
201 | * sCG -> sCG DataAck in CLOSING MAY be processed (8.3.) |
202 | * sTW -> sIV |
203 | * |
204 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
205 | sIV, sIV, sPO, sPO, sOP, sCR, sCG, sIV |
206 | }, |
207 | [DCCP_PKT_CLOSEREQ] = { |
208 | /* |
209 | * CLOSEREQ may only be sent by the server. |
210 | * |
211 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
212 | sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV |
213 | }, |
214 | [DCCP_PKT_CLOSE] = { |
215 | /* |
216 | * sNO -> sIV No connection |
217 | * sRQ -> sIV No connection |
218 | * sRS -> sIV No connection |
219 | * sPO -> sCG Client-initiated close |
220 | * sOP -> sCG Client-initiated close |
221 | * sCR -> sCG Close in response to CloseReq (8.3.) |
222 | * sCG -> sCG Retransmit |
223 | * sTW -> sIV Late retransmit, already in TIME_WAIT |
224 | * |
225 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
226 | sIV, sIV, sIV, sCG, sCG, sCG, sIV, sIV |
227 | }, |
228 | [DCCP_PKT_RESET] = { |
229 | /* |
230 | * sNO -> sIV No connection |
231 | * sRQ -> sTW Sync received or timeout, SHOULD send Reset (8.1.1.) |
232 | * sRS -> sTW Response received without Request |
233 | * sPO -> sTW Timeout, SHOULD send Reset (8.1.5.) |
234 | * sOP -> sTW Connection reset |
235 | * sCR -> sTW Connection reset |
236 | * sCG -> sTW Connection reset |
237 | * sTW -> sIG Ignore (don't refresh timer) |
238 | * |
239 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
240 | sIV, sTW, sTW, sTW, sTW, sTW, sTW, sIG |
241 | }, |
242 | [DCCP_PKT_SYNC] = { |
243 | /* |
244 | * We currently ignore Sync packets |
245 | * |
246 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
247 | sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, |
248 | }, |
249 | [DCCP_PKT_SYNCACK] = { |
250 | /* |
251 | * We currently ignore SyncAck packets |
252 | * |
253 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
254 | sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, |
255 | }, |
256 | }, |
257 | [CT_DCCP_ROLE_SERVER] = { |
258 | [DCCP_PKT_REQUEST] = { |
259 | /* |
260 | * sNO -> sIV Invalid |
261 | * sRQ -> sIG Ignore, conntrack might be out of sync |
262 | * sRS -> sIG Ignore, conntrack might be out of sync |
263 | * sPO -> sIG Ignore, conntrack might be out of sync |
264 | * sOP -> sIG Ignore, conntrack might be out of sync |
265 | * sCR -> sIG Ignore, conntrack might be out of sync |
266 | * sCG -> sIG Ignore, conntrack might be out of sync |
267 | * sTW -> sRQ Reincarnation, must reverse roles |
268 | * |
269 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
270 | sIV, sIG, sIG, sIG, sIG, sIG, sIG, sRQ |
271 | }, |
272 | [DCCP_PKT_RESPONSE] = { |
273 | /* |
274 | * sNO -> sIV Response without Request |
275 | * sRQ -> sRS Response to clients Request |
276 | * sRS -> sRS Retransmitted Response (8.1.3. SHOULD NOT) |
277 | * sPO -> sIG Response to an ignored Request or late retransmit |
278 | * sOP -> sIG Ignore, might be response to ignored Request |
279 | * sCR -> sIG Ignore, might be response to ignored Request |
280 | * sCG -> sIG Ignore, might be response to ignored Request |
281 | * sTW -> sIV Invalid, Request from client in sTW moves to sRQ |
282 | * |
283 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
284 | sIV, sRS, sRS, sIG, sIG, sIG, sIG, sIV |
285 | }, |
286 | [DCCP_PKT_ACK] = { |
287 | /* |
288 | * sNO -> sIV No connection |
289 | * sRQ -> sIV No connection |
290 | * sRS -> sIV No connection |
291 | * sPO -> sOP Enter OPEN state (8.1.5.) |
292 | * sOP -> sOP Regular Ack in OPEN state |
293 | * sCR -> sIV Waiting for Close from client |
294 | * sCG -> sCG Ack in CLOSING MAY be processed (8.3.) |
295 | * sTW -> sIV |
296 | * |
297 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
298 | sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV |
299 | }, |
300 | [DCCP_PKT_DATA] = { |
301 | /* |
302 | * sNO -> sIV No connection |
303 | * sRQ -> sIV No connection |
304 | * sRS -> sIV No connection |
305 | * sPO -> sOP Enter OPEN state (8.1.5.) |
306 | * sOP -> sOP Regular Data packet in OPEN state |
307 | * sCR -> sIV Waiting for Close from client |
308 | * sCG -> sCG Data in CLOSING MAY be processed (8.3.) |
309 | * sTW -> sIV |
310 | * |
311 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
312 | sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV |
313 | }, |
314 | [DCCP_PKT_DATAACK] = { |
315 | /* |
316 | * sNO -> sIV No connection |
317 | * sRQ -> sIV No connection |
318 | * sRS -> sIV No connection |
319 | * sPO -> sOP Enter OPEN state (8.1.5.) |
320 | * sOP -> sOP Regular DataAck in OPEN state |
321 | * sCR -> sIV Waiting for Close from client |
322 | * sCG -> sCG Data in CLOSING MAY be processed (8.3.) |
323 | * sTW -> sIV |
324 | * |
325 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
326 | sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV |
327 | }, |
328 | [DCCP_PKT_CLOSEREQ] = { |
329 | /* |
330 | * sNO -> sIV No connection |
331 | * sRQ -> sIV No connection |
332 | * sRS -> sIV No connection |
333 | * sPO -> sOP -> sCR Move directly to CLOSEREQ (8.1.5.) |
334 | * sOP -> sCR CloseReq in OPEN state |
335 | * sCR -> sCR Retransmit |
336 | * sCG -> sCR Simultaneous close, client sends another Close |
337 | * sTW -> sIV Already closed |
338 | * |
339 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
340 | sIV, sIV, sIV, sCR, sCR, sCR, sCR, sIV |
341 | }, |
342 | [DCCP_PKT_CLOSE] = { |
343 | /* |
344 | * sNO -> sIV No connection |
345 | * sRQ -> sIV No connection |
346 | * sRS -> sIV No connection |
347 | * sPO -> sOP -> sCG Move direcly to CLOSING |
348 | * sOP -> sCG Move to CLOSING |
349 | * sCR -> sIV Close after CloseReq is invalid |
350 | * sCG -> sCG Retransmit |
351 | * sTW -> sIV Already closed |
352 | * |
353 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
354 | sIV, sIV, sIV, sCG, sCG, sIV, sCG, sIV |
355 | }, |
356 | [DCCP_PKT_RESET] = { |
357 | /* |
358 | * sNO -> sIV No connection |
359 | * sRQ -> sTW Reset in response to Request |
360 | * sRS -> sTW Timeout, SHOULD send Reset (8.1.3.) |
361 | * sPO -> sTW Timeout, SHOULD send Reset (8.1.3.) |
362 | * sOP -> sTW |
363 | * sCR -> sTW |
364 | * sCG -> sTW |
365 | * sTW -> sIG Ignore (don't refresh timer) |
366 | * |
367 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW, sTW */ |
368 | sIV, sTW, sTW, sTW, sTW, sTW, sTW, sTW, sIG |
369 | }, |
370 | [DCCP_PKT_SYNC] = { |
371 | /* |
372 | * We currently ignore Sync packets |
373 | * |
374 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
375 | sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, |
376 | }, |
377 | [DCCP_PKT_SYNCACK] = { |
378 | /* |
379 | * We currently ignore SyncAck packets |
380 | * |
381 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
382 | sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, |
383 | }, |
384 | }, |
385 | }; |
386 | |
387 | /* this module per-net specifics */ |
388 | static int dccp_net_id __read_mostly; |
389 | struct dccp_net { |
390 | struct nf_proto_net pn; |
391 | int dccp_loose; |
392 | unsigned int dccp_timeout[CT_DCCP_MAX + 1]; |
393 | }; |
394 | |
395 | static inline struct dccp_net *dccp_pernet(struct net *net) |
396 | { |
397 | return net_generic(net, dccp_net_id); |
398 | } |
399 | |
400 | static bool dccp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff, |
401 | struct nf_conntrack_tuple *tuple) |
402 | { |
403 | struct dccp_hdr _hdr, *dh; |
404 | |
405 | dh = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); |
406 | if (dh == NULL) |
407 | return false; |
408 | |
409 | tuple->src.u.dccp.port = dh->dccph_sport; |
410 | tuple->dst.u.dccp.port = dh->dccph_dport; |
411 | return true; |
412 | } |
413 | |
414 | static bool dccp_invert_tuple(struct nf_conntrack_tuple *inv, |
415 | const struct nf_conntrack_tuple *tuple) |
416 | { |
417 | inv->src.u.dccp.port = tuple->dst.u.dccp.port; |
418 | inv->dst.u.dccp.port = tuple->src.u.dccp.port; |
419 | return true; |
420 | } |
421 | |
422 | static bool dccp_new(struct nf_conn *ct, const struct sk_buff *skb, |
423 | unsigned int dataoff, unsigned int *timeouts) |
424 | { |
425 | struct net *net = nf_ct_net(ct); |
426 | struct dccp_net *dn; |
427 | struct dccp_hdr _dh, *dh; |
428 | const char *msg; |
429 | u_int8_t state; |
430 | |
431 | dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh); |
432 | BUG_ON(dh == NULL); |
433 | |
434 | state = dccp_state_table[CT_DCCP_ROLE_CLIENT][dh->dccph_type][CT_DCCP_NONE]; |
435 | switch (state) { |
436 | default: |
437 | dn = dccp_pernet(net); |
438 | if (dn->dccp_loose == 0) { |
439 | msg = "nf_ct_dccp: not picking up existing connection "; |
440 | goto out_invalid; |
441 | } |
442 | case CT_DCCP_REQUEST: |
443 | break; |
444 | case CT_DCCP_INVALID: |
445 | msg = "nf_ct_dccp: invalid state transition "; |
446 | goto out_invalid; |
447 | } |
448 | |
449 | ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT; |
450 | ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER; |
451 | ct->proto.dccp.state = CT_DCCP_NONE; |
452 | ct->proto.dccp.last_pkt = DCCP_PKT_REQUEST; |
453 | ct->proto.dccp.last_dir = IP_CT_DIR_ORIGINAL; |
454 | ct->proto.dccp.handshake_seq = 0; |
455 | return true; |
456 | |
457 | out_invalid: |
458 | if (LOG_INVALID(net, IPPROTO_DCCP)) |
459 | nf_log_packet(net, nf_ct_l3num(ct), 0, skb, NULL, NULL, |
460 | NULL, "%s", msg); |
461 | return false; |
462 | } |
463 | |
464 | static u64 dccp_ack_seq(const struct dccp_hdr *dh) |
465 | { |
466 | const struct dccp_hdr_ack_bits *dhack; |
467 | |
468 | dhack = (void *)dh + __dccp_basic_hdr_len(dh); |
469 | return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + |
470 | ntohl(dhack->dccph_ack_nr_low); |
471 | } |
472 | |
473 | static unsigned int *dccp_get_timeouts(struct net *net) |
474 | { |
475 | return dccp_pernet(net)->dccp_timeout; |
476 | } |
477 | |
478 | static int dccp_packet(struct nf_conn *ct, const struct sk_buff *skb, |
479 | unsigned int dataoff, enum ip_conntrack_info ctinfo, |
480 | u_int8_t pf, unsigned int hooknum, |
481 | unsigned int *timeouts) |
482 | { |
483 | struct net *net = nf_ct_net(ct); |
484 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
485 | struct dccp_hdr _dh, *dh; |
486 | u_int8_t type, old_state, new_state; |
487 | enum ct_dccp_roles role; |
488 | |
489 | dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh); |
490 | BUG_ON(dh == NULL); |
491 | type = dh->dccph_type; |
492 | |
493 | if (type == DCCP_PKT_RESET && |
494 | !test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
495 | /* Tear down connection immediately if only reply is a RESET */ |
496 | nf_ct_kill_acct(ct, ctinfo, skb); |
497 | return NF_ACCEPT; |
498 | } |
499 | |
500 | spin_lock_bh(&ct->lock); |
501 | |
502 | role = ct->proto.dccp.role[dir]; |
503 | old_state = ct->proto.dccp.state; |
504 | new_state = dccp_state_table[role][type][old_state]; |
505 | |
506 | switch (new_state) { |
507 | case CT_DCCP_REQUEST: |
508 | if (old_state == CT_DCCP_TIMEWAIT && |
509 | role == CT_DCCP_ROLE_SERVER) { |
510 | /* Reincarnation in the reverse direction: reopen and |
511 | * reverse client/server roles. */ |
512 | ct->proto.dccp.role[dir] = CT_DCCP_ROLE_CLIENT; |
513 | ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_SERVER; |
514 | } |
515 | break; |
516 | case CT_DCCP_RESPOND: |
517 | if (old_state == CT_DCCP_REQUEST) |
518 | ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh); |
519 | break; |
520 | case CT_DCCP_PARTOPEN: |
521 | if (old_state == CT_DCCP_RESPOND && |
522 | type == DCCP_PKT_ACK && |
523 | dccp_ack_seq(dh) == ct->proto.dccp.handshake_seq) |
524 | set_bit(IPS_ASSURED_BIT, &ct->status); |
525 | break; |
526 | case CT_DCCP_IGNORE: |
527 | /* |
528 | * Connection tracking might be out of sync, so we ignore |
529 | * packets that might establish a new connection and resync |
530 | * if the server responds with a valid Response. |
531 | */ |
532 | if (ct->proto.dccp.last_dir == !dir && |
533 | ct->proto.dccp.last_pkt == DCCP_PKT_REQUEST && |
534 | type == DCCP_PKT_RESPONSE) { |
535 | ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_CLIENT; |
536 | ct->proto.dccp.role[dir] = CT_DCCP_ROLE_SERVER; |
537 | ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh); |
538 | new_state = CT_DCCP_RESPOND; |
539 | break; |
540 | } |
541 | ct->proto.dccp.last_dir = dir; |
542 | ct->proto.dccp.last_pkt = type; |
543 | |
544 | spin_unlock_bh(&ct->lock); |
545 | if (LOG_INVALID(net, IPPROTO_DCCP)) |
546 | nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, |
547 | "nf_ct_dccp: invalid packet ignored "); |
548 | return NF_ACCEPT; |
549 | case CT_DCCP_INVALID: |
550 | spin_unlock_bh(&ct->lock); |
551 | if (LOG_INVALID(net, IPPROTO_DCCP)) |
552 | nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, |
553 | "nf_ct_dccp: invalid state transition "); |
554 | return -NF_ACCEPT; |
555 | } |
556 | |
557 | ct->proto.dccp.last_dir = dir; |
558 | ct->proto.dccp.last_pkt = type; |
559 | ct->proto.dccp.state = new_state; |
560 | spin_unlock_bh(&ct->lock); |
561 | |
562 | if (new_state != old_state) |
563 | nf_conntrack_event_cache(IPCT_PROTOINFO, ct); |
564 | |
565 | nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]); |
566 | |
567 | return NF_ACCEPT; |
568 | } |
569 | |
570 | static int dccp_error(struct net *net, struct nf_conn *tmpl, |
571 | struct sk_buff *skb, unsigned int dataoff, |
572 | enum ip_conntrack_info *ctinfo, |
573 | u_int8_t pf, unsigned int hooknum) |
574 | { |
575 | struct dccp_hdr _dh, *dh; |
576 | unsigned int dccp_len = skb->len - dataoff; |
577 | unsigned int cscov; |
578 | const char *msg; |
579 | |
580 | dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh); |
581 | if (dh == NULL) { |
582 | msg = "nf_ct_dccp: short packet "; |
583 | goto out_invalid; |
584 | } |
585 | |
586 | if (dh->dccph_doff * 4 < sizeof(struct dccp_hdr) || |
587 | dh->dccph_doff * 4 > dccp_len) { |
588 | msg = "nf_ct_dccp: truncated/malformed packet "; |
589 | goto out_invalid; |
590 | } |
591 | |
592 | cscov = dccp_len; |
593 | if (dh->dccph_cscov) { |
594 | cscov = (dh->dccph_cscov - 1) * 4; |
595 | if (cscov > dccp_len) { |
596 | msg = "nf_ct_dccp: bad checksum coverage "; |
597 | goto out_invalid; |
598 | } |
599 | } |
600 | |
601 | if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && |
602 | nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_DCCP, |
603 | pf)) { |
604 | msg = "nf_ct_dccp: bad checksum "; |
605 | goto out_invalid; |
606 | } |
607 | |
608 | if (dh->dccph_type >= DCCP_PKT_INVALID) { |
609 | msg = "nf_ct_dccp: reserved packet type "; |
610 | goto out_invalid; |
611 | } |
612 | |
613 | return NF_ACCEPT; |
614 | |
615 | out_invalid: |
616 | if (LOG_INVALID(net, IPPROTO_DCCP)) |
617 | nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, "%s", msg); |
618 | return -NF_ACCEPT; |
619 | } |
620 | |
621 | static int dccp_print_tuple(struct seq_file *s, |
622 | const struct nf_conntrack_tuple *tuple) |
623 | { |
624 | return seq_printf(s, "sport=%hu dport=%hu ", |
625 | ntohs(tuple->src.u.dccp.port), |
626 | ntohs(tuple->dst.u.dccp.port)); |
627 | } |
628 | |
629 | static int dccp_print_conntrack(struct seq_file *s, struct nf_conn *ct) |
630 | { |
631 | return seq_printf(s, "%s ", dccp_state_names[ct->proto.dccp.state]); |
632 | } |
633 | |
634 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
635 | static int dccp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, |
636 | struct nf_conn *ct) |
637 | { |
638 | struct nlattr *nest_parms; |
639 | |
640 | spin_lock_bh(&ct->lock); |
641 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_DCCP | NLA_F_NESTED); |
642 | if (!nest_parms) |
643 | goto nla_put_failure; |
644 | if (nla_put_u8(skb, CTA_PROTOINFO_DCCP_STATE, ct->proto.dccp.state) || |
645 | nla_put_u8(skb, CTA_PROTOINFO_DCCP_ROLE, |
646 | ct->proto.dccp.role[IP_CT_DIR_ORIGINAL]) || |
647 | nla_put_be64(skb, CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ, |
648 | cpu_to_be64(ct->proto.dccp.handshake_seq))) |
649 | goto nla_put_failure; |
650 | nla_nest_end(skb, nest_parms); |
651 | spin_unlock_bh(&ct->lock); |
652 | return 0; |
653 | |
654 | nla_put_failure: |
655 | spin_unlock_bh(&ct->lock); |
656 | return -1; |
657 | } |
658 | |
659 | static const struct nla_policy dccp_nla_policy[CTA_PROTOINFO_DCCP_MAX + 1] = { |
660 | [CTA_PROTOINFO_DCCP_STATE] = { .type = NLA_U8 }, |
661 | [CTA_PROTOINFO_DCCP_ROLE] = { .type = NLA_U8 }, |
662 | [CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ] = { .type = NLA_U64 }, |
663 | }; |
664 | |
665 | static int nlattr_to_dccp(struct nlattr *cda[], struct nf_conn *ct) |
666 | { |
667 | struct nlattr *attr = cda[CTA_PROTOINFO_DCCP]; |
668 | struct nlattr *tb[CTA_PROTOINFO_DCCP_MAX + 1]; |
669 | int err; |
670 | |
671 | if (!attr) |
672 | return 0; |
673 | |
674 | err = nla_parse_nested(tb, CTA_PROTOINFO_DCCP_MAX, attr, |
675 | dccp_nla_policy); |
676 | if (err < 0) |
677 | return err; |
678 | |
679 | if (!tb[CTA_PROTOINFO_DCCP_STATE] || |
680 | !tb[CTA_PROTOINFO_DCCP_ROLE] || |
681 | nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) > CT_DCCP_ROLE_MAX || |
682 | nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]) >= CT_DCCP_IGNORE) { |
683 | return -EINVAL; |
684 | } |
685 | |
686 | spin_lock_bh(&ct->lock); |
687 | ct->proto.dccp.state = nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]); |
688 | if (nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) == CT_DCCP_ROLE_CLIENT) { |
689 | ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT; |
690 | ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER; |
691 | } else { |
692 | ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_SERVER; |
693 | ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_CLIENT; |
694 | } |
695 | if (tb[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ]) { |
696 | ct->proto.dccp.handshake_seq = |
697 | be64_to_cpu(nla_get_be64(tb[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ])); |
698 | } |
699 | spin_unlock_bh(&ct->lock); |
700 | return 0; |
701 | } |
702 | |
703 | static int dccp_nlattr_size(void) |
704 | { |
705 | return nla_total_size(0) /* CTA_PROTOINFO_DCCP */ |
706 | + nla_policy_len(dccp_nla_policy, CTA_PROTOINFO_DCCP_MAX + 1); |
707 | } |
708 | |
709 | #endif |
710 | |
711 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
712 | |
713 | #include <linux/netfilter/nfnetlink.h> |
714 | #include <linux/netfilter/nfnetlink_cttimeout.h> |
715 | |
716 | static int dccp_timeout_nlattr_to_obj(struct nlattr *tb[], |
717 | struct net *net, void *data) |
718 | { |
719 | struct dccp_net *dn = dccp_pernet(net); |
720 | unsigned int *timeouts = data; |
721 | int i; |
722 | |
723 | /* set default DCCP timeouts. */ |
724 | for (i=0; i<CT_DCCP_MAX; i++) |
725 | timeouts[i] = dn->dccp_timeout[i]; |
726 | |
727 | /* there's a 1:1 mapping between attributes and protocol states. */ |
728 | for (i=CTA_TIMEOUT_DCCP_UNSPEC+1; i<CTA_TIMEOUT_DCCP_MAX+1; i++) { |
729 | if (tb[i]) { |
730 | timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ; |
731 | } |
732 | } |
733 | return 0; |
734 | } |
735 | |
736 | static int |
737 | dccp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) |
738 | { |
739 | const unsigned int *timeouts = data; |
740 | int i; |
741 | |
742 | for (i=CTA_TIMEOUT_DCCP_UNSPEC+1; i<CTA_TIMEOUT_DCCP_MAX+1; i++) { |
743 | if (nla_put_be32(skb, i, htonl(timeouts[i] / HZ))) |
744 | goto nla_put_failure; |
745 | } |
746 | return 0; |
747 | |
748 | nla_put_failure: |
749 | return -ENOSPC; |
750 | } |
751 | |
752 | static const struct nla_policy |
753 | dccp_timeout_nla_policy[CTA_TIMEOUT_DCCP_MAX+1] = { |
754 | [CTA_TIMEOUT_DCCP_REQUEST] = { .type = NLA_U32 }, |
755 | [CTA_TIMEOUT_DCCP_RESPOND] = { .type = NLA_U32 }, |
756 | [CTA_TIMEOUT_DCCP_PARTOPEN] = { .type = NLA_U32 }, |
757 | [CTA_TIMEOUT_DCCP_OPEN] = { .type = NLA_U32 }, |
758 | [CTA_TIMEOUT_DCCP_CLOSEREQ] = { .type = NLA_U32 }, |
759 | [CTA_TIMEOUT_DCCP_CLOSING] = { .type = NLA_U32 }, |
760 | [CTA_TIMEOUT_DCCP_TIMEWAIT] = { .type = NLA_U32 }, |
761 | }; |
762 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ |
763 | |
764 | #ifdef CONFIG_SYSCTL |
765 | /* template, data assigned later */ |
766 | static struct ctl_table dccp_sysctl_table[] = { |
767 | { |
768 | .procname = "nf_conntrack_dccp_timeout_request", |
769 | .maxlen = sizeof(unsigned int), |
770 | .mode = 0644, |
771 | .proc_handler = proc_dointvec_jiffies, |
772 | }, |
773 | { |
774 | .procname = "nf_conntrack_dccp_timeout_respond", |
775 | .maxlen = sizeof(unsigned int), |
776 | .mode = 0644, |
777 | .proc_handler = proc_dointvec_jiffies, |
778 | }, |
779 | { |
780 | .procname = "nf_conntrack_dccp_timeout_partopen", |
781 | .maxlen = sizeof(unsigned int), |
782 | .mode = 0644, |
783 | .proc_handler = proc_dointvec_jiffies, |
784 | }, |
785 | { |
786 | .procname = "nf_conntrack_dccp_timeout_open", |
787 | .maxlen = sizeof(unsigned int), |
788 | .mode = 0644, |
789 | .proc_handler = proc_dointvec_jiffies, |
790 | }, |
791 | { |
792 | .procname = "nf_conntrack_dccp_timeout_closereq", |
793 | .maxlen = sizeof(unsigned int), |
794 | .mode = 0644, |
795 | .proc_handler = proc_dointvec_jiffies, |
796 | }, |
797 | { |
798 | .procname = "nf_conntrack_dccp_timeout_closing", |
799 | .maxlen = sizeof(unsigned int), |
800 | .mode = 0644, |
801 | .proc_handler = proc_dointvec_jiffies, |
802 | }, |
803 | { |
804 | .procname = "nf_conntrack_dccp_timeout_timewait", |
805 | .maxlen = sizeof(unsigned int), |
806 | .mode = 0644, |
807 | .proc_handler = proc_dointvec_jiffies, |
808 | }, |
809 | { |
810 | .procname = "nf_conntrack_dccp_loose", |
811 | .maxlen = sizeof(int), |
812 | .mode = 0644, |
813 | .proc_handler = proc_dointvec, |
814 | }, |
815 | { } |
816 | }; |
817 | #endif /* CONFIG_SYSCTL */ |
818 | |
819 | static int dccp_kmemdup_sysctl_table(struct net *net, struct nf_proto_net *pn, |
820 | struct dccp_net *dn) |
821 | { |
822 | #ifdef CONFIG_SYSCTL |
823 | if (pn->ctl_table) |
824 | return 0; |
825 | |
826 | pn->ctl_table = kmemdup(dccp_sysctl_table, |
827 | sizeof(dccp_sysctl_table), |
828 | GFP_KERNEL); |
829 | if (!pn->ctl_table) |
830 | return -ENOMEM; |
831 | |
832 | pn->ctl_table[0].data = &dn->dccp_timeout[CT_DCCP_REQUEST]; |
833 | pn->ctl_table[1].data = &dn->dccp_timeout[CT_DCCP_RESPOND]; |
834 | pn->ctl_table[2].data = &dn->dccp_timeout[CT_DCCP_PARTOPEN]; |
835 | pn->ctl_table[3].data = &dn->dccp_timeout[CT_DCCP_OPEN]; |
836 | pn->ctl_table[4].data = &dn->dccp_timeout[CT_DCCP_CLOSEREQ]; |
837 | pn->ctl_table[5].data = &dn->dccp_timeout[CT_DCCP_CLOSING]; |
838 | pn->ctl_table[6].data = &dn->dccp_timeout[CT_DCCP_TIMEWAIT]; |
839 | pn->ctl_table[7].data = &dn->dccp_loose; |
840 | |
841 | /* Don't export sysctls to unprivileged users */ |
842 | if (net->user_ns != &init_user_ns) |
843 | pn->ctl_table[0].procname = NULL; |
844 | #endif |
845 | return 0; |
846 | } |
847 | |
848 | static int dccp_init_net(struct net *net, u_int16_t proto) |
849 | { |
850 | struct dccp_net *dn = dccp_pernet(net); |
851 | struct nf_proto_net *pn = &dn->pn; |
852 | |
853 | if (!pn->users) { |
854 | /* default values */ |
855 | dn->dccp_loose = 1; |
856 | dn->dccp_timeout[CT_DCCP_REQUEST] = 2 * DCCP_MSL; |
857 | dn->dccp_timeout[CT_DCCP_RESPOND] = 4 * DCCP_MSL; |
858 | dn->dccp_timeout[CT_DCCP_PARTOPEN] = 4 * DCCP_MSL; |
859 | dn->dccp_timeout[CT_DCCP_OPEN] = 12 * 3600 * HZ; |
860 | dn->dccp_timeout[CT_DCCP_CLOSEREQ] = 64 * HZ; |
861 | dn->dccp_timeout[CT_DCCP_CLOSING] = 64 * HZ; |
862 | dn->dccp_timeout[CT_DCCP_TIMEWAIT] = 2 * DCCP_MSL; |
863 | } |
864 | |
865 | return dccp_kmemdup_sysctl_table(net, pn, dn); |
866 | } |
867 | |
868 | static struct nf_conntrack_l4proto dccp_proto4 __read_mostly = { |
869 | .l3proto = AF_INET, |
870 | .l4proto = IPPROTO_DCCP, |
871 | .name = "dccp", |
872 | .pkt_to_tuple = dccp_pkt_to_tuple, |
873 | .invert_tuple = dccp_invert_tuple, |
874 | .new = dccp_new, |
875 | .packet = dccp_packet, |
876 | .get_timeouts = dccp_get_timeouts, |
877 | .error = dccp_error, |
878 | .print_tuple = dccp_print_tuple, |
879 | .print_conntrack = dccp_print_conntrack, |
880 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
881 | .to_nlattr = dccp_to_nlattr, |
882 | .nlattr_size = dccp_nlattr_size, |
883 | .from_nlattr = nlattr_to_dccp, |
884 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
885 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
886 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
887 | .nla_policy = nf_ct_port_nla_policy, |
888 | #endif |
889 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
890 | .ctnl_timeout = { |
891 | .nlattr_to_obj = dccp_timeout_nlattr_to_obj, |
892 | .obj_to_nlattr = dccp_timeout_obj_to_nlattr, |
893 | .nlattr_max = CTA_TIMEOUT_DCCP_MAX, |
894 | .obj_size = sizeof(unsigned int) * CT_DCCP_MAX, |
895 | .nla_policy = dccp_timeout_nla_policy, |
896 | }, |
897 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ |
898 | .net_id = &dccp_net_id, |
899 | .init_net = dccp_init_net, |
900 | }; |
901 | |
902 | static struct nf_conntrack_l4proto dccp_proto6 __read_mostly = { |
903 | .l3proto = AF_INET6, |
904 | .l4proto = IPPROTO_DCCP, |
905 | .name = "dccp", |
906 | .pkt_to_tuple = dccp_pkt_to_tuple, |
907 | .invert_tuple = dccp_invert_tuple, |
908 | .new = dccp_new, |
909 | .packet = dccp_packet, |
910 | .get_timeouts = dccp_get_timeouts, |
911 | .error = dccp_error, |
912 | .print_tuple = dccp_print_tuple, |
913 | .print_conntrack = dccp_print_conntrack, |
914 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
915 | .to_nlattr = dccp_to_nlattr, |
916 | .nlattr_size = dccp_nlattr_size, |
917 | .from_nlattr = nlattr_to_dccp, |
918 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
919 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
920 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
921 | .nla_policy = nf_ct_port_nla_policy, |
922 | #endif |
923 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
924 | .ctnl_timeout = { |
925 | .nlattr_to_obj = dccp_timeout_nlattr_to_obj, |
926 | .obj_to_nlattr = dccp_timeout_obj_to_nlattr, |
927 | .nlattr_max = CTA_TIMEOUT_DCCP_MAX, |
928 | .obj_size = sizeof(unsigned int) * CT_DCCP_MAX, |
929 | .nla_policy = dccp_timeout_nla_policy, |
930 | }, |
931 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ |
932 | .net_id = &dccp_net_id, |
933 | .init_net = dccp_init_net, |
934 | }; |
935 | |
936 | static __net_init int dccp_net_init(struct net *net) |
937 | { |
938 | int ret = 0; |
939 | ret = nf_ct_l4proto_pernet_register(net, &dccp_proto4); |
940 | if (ret < 0) { |
941 | pr_err("nf_conntrack_dccp4: pernet registration failed.\n"); |
942 | goto out; |
943 | } |
944 | ret = nf_ct_l4proto_pernet_register(net, &dccp_proto6); |
945 | if (ret < 0) { |
946 | pr_err("nf_conntrack_dccp6: pernet registration failed.\n"); |
947 | goto cleanup_dccp4; |
948 | } |
949 | return 0; |
950 | cleanup_dccp4: |
951 | nf_ct_l4proto_pernet_unregister(net, &dccp_proto4); |
952 | out: |
953 | return ret; |
954 | } |
955 | |
956 | static __net_exit void dccp_net_exit(struct net *net) |
957 | { |
958 | nf_ct_l4proto_pernet_unregister(net, &dccp_proto6); |
959 | nf_ct_l4proto_pernet_unregister(net, &dccp_proto4); |
960 | } |
961 | |
962 | static struct pernet_operations dccp_net_ops = { |
963 | .init = dccp_net_init, |
964 | .exit = dccp_net_exit, |
965 | .id = &dccp_net_id, |
966 | .size = sizeof(struct dccp_net), |
967 | }; |
968 | |
969 | static int __init nf_conntrack_proto_dccp_init(void) |
970 | { |
971 | int ret; |
972 | |
973 | ret = register_pernet_subsys(&dccp_net_ops); |
974 | if (ret < 0) |
975 | goto out_pernet; |
976 | |
977 | ret = nf_ct_l4proto_register(&dccp_proto4); |
978 | if (ret < 0) |
979 | goto out_dccp4; |
980 | |
981 | ret = nf_ct_l4proto_register(&dccp_proto6); |
982 | if (ret < 0) |
983 | goto out_dccp6; |
984 | |
985 | return 0; |
986 | out_dccp6: |
987 | nf_ct_l4proto_unregister(&dccp_proto4); |
988 | out_dccp4: |
989 | unregister_pernet_subsys(&dccp_net_ops); |
990 | out_pernet: |
991 | return ret; |
992 | } |
993 | |
994 | static void __exit nf_conntrack_proto_dccp_fini(void) |
995 | { |
996 | nf_ct_l4proto_unregister(&dccp_proto6); |
997 | nf_ct_l4proto_unregister(&dccp_proto4); |
998 | unregister_pernet_subsys(&dccp_net_ops); |
999 | } |
1000 | |
1001 | module_init(nf_conntrack_proto_dccp_init); |
1002 | module_exit(nf_conntrack_proto_dccp_fini); |
1003 | |
1004 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
1005 | MODULE_DESCRIPTION("DCCP connection tracking protocol helper"); |
1006 | MODULE_LICENSE("GPL"); |
1007 |
Branches:
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javiroman/ks7010
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jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9