2 * DCCP connection tracking protocol helper
4 * Copyright (c) 2005, 2006, 2008 Patrick McHardy <kaber@trash.net>
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.
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>
20 #include <net/net_namespace.h>
21 #include <net/netns/generic.h>
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>
29 /* Timeouts are based on values from RFC4340:
33 * 8.1.2. Client Request
35 * A client MAY give up on its DCCP-Requests after some time
36 * (3 minutes, for example).
40 * 8.1.3. Server Response
42 * It MAY also leave the RESPOND state for CLOSED after a timeout of
43 * not less than 4MSL (8 minutes);
47 * 8.1.5. Handshake Completion
49 * If the client remains in PARTOPEN for more than 4MSL (8 minutes),
50 * it SHOULD reset the connection with Reset Code 2, "Aborted".
54 * The DCCP timestamp overflows after 11.9 hours. If the connection
55 * stays idle this long the sequence number won't be recognized
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
70 * A server or client socket remains in this state for 2MSL (4 minutes)
71 * after the connection has been town down, ...
74 #define DCCP_MSL (2 * 60 * HZ)
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",
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
101 * DCCP state transition table
103 * The assumption is the same as for TCP tracking:
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.
109 * The following states exist:
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
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.
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
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
] = {
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
147 * sNO, sRQ, sRS, sPO. sOP, sCR, sCG, sTW, */
148 sRQ
, sRQ
, sRS
, sIG
, sIG
, sIG
, sIG
, sRQ
,
150 [DCCP_PKT_RESPONSE
] = {
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
162 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
163 sIV
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIV
,
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.)
176 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
177 sIV
, sIV
, sPO
, sPO
, sOP
, sCR
, sCG
, sIV
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.)
190 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
191 sIV
, sIV
, sIV
, sIV
, sOP
, sCR
, sCG
, sIV
,
193 [DCCP_PKT_DATAACK
] = {
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.)
204 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
205 sIV
, sIV
, sPO
, sPO
, sOP
, sCR
, sCG
, sIV
207 [DCCP_PKT_CLOSEREQ
] = {
209 * CLOSEREQ may only be sent by the server.
211 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
212 sIV
, sIV
, sIV
, sIV
, sIV
, sIV
, sIV
, sIV
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
225 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
226 sIV
, sIV
, sIV
, sCG
, sCG
, sCG
, sIV
, sIV
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)
239 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
240 sIV
, sTW
, sTW
, sTW
, sTW
, sTW
, sTW
, sIG
244 * We currently ignore Sync packets
246 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
247 sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
,
249 [DCCP_PKT_SYNCACK
] = {
251 * We currently ignore SyncAck packets
253 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
254 sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
,
257 [CT_DCCP_ROLE_SERVER
] = {
258 [DCCP_PKT_REQUEST
] = {
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
269 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
270 sIV
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sRQ
272 [DCCP_PKT_RESPONSE
] = {
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
283 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
284 sIV
, sRS
, sRS
, sIG
, sIG
, sIG
, sIG
, sIV
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.)
297 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
298 sIV
, sIV
, sIV
, sOP
, sOP
, sIV
, sCG
, sIV
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.)
311 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
312 sIV
, sIV
, sIV
, sOP
, sOP
, sIV
, sCG
, sIV
314 [DCCP_PKT_DATAACK
] = {
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.)
325 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
326 sIV
, sIV
, sIV
, sOP
, sOP
, sIV
, sCG
, sIV
328 [DCCP_PKT_CLOSEREQ
] = {
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
339 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
340 sIV
, sIV
, sIV
, sCR
, sCR
, sCR
, sCR
, sIV
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
353 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
354 sIV
, sIV
, sIV
, sCG
, sCG
, sIV
, sCG
, sIV
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.)
365 * sTW -> sIG Ignore (don't refresh timer)
367 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW, sTW */
368 sIV
, sTW
, sTW
, sTW
, sTW
, sTW
, sTW
, sTW
, sIG
372 * We currently ignore Sync packets
374 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
375 sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
,
377 [DCCP_PKT_SYNCACK
] = {
379 * We currently ignore SyncAck packets
381 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
382 sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
,
387 /* this module per-net specifics */
388 static int dccp_net_id __read_mostly
;
390 struct nf_proto_net pn
;
392 unsigned int dccp_timeout
[CT_DCCP_MAX
+ 1];
395 static inline struct dccp_net
*dccp_pernet(struct net
*net
)
397 return net_generic(net
, dccp_net_id
);
400 static bool dccp_pkt_to_tuple(const struct sk_buff
*skb
, unsigned int dataoff
,
401 struct nf_conntrack_tuple
*tuple
)
403 struct dccp_hdr _hdr
, *dh
;
405 dh
= skb_header_pointer(skb
, dataoff
, sizeof(_hdr
), &_hdr
);
409 tuple
->src
.u
.dccp
.port
= dh
->dccph_sport
;
410 tuple
->dst
.u
.dccp
.port
= dh
->dccph_dport
;
414 static bool dccp_invert_tuple(struct nf_conntrack_tuple
*inv
,
415 const struct nf_conntrack_tuple
*tuple
)
417 inv
->src
.u
.dccp
.port
= tuple
->dst
.u
.dccp
.port
;
418 inv
->dst
.u
.dccp
.port
= tuple
->src
.u
.dccp
.port
;
422 static bool dccp_new(struct nf_conn
*ct
, const struct sk_buff
*skb
,
423 unsigned int dataoff
, unsigned int *timeouts
)
425 struct net
*net
= nf_ct_net(ct
);
427 struct dccp_hdr _dh
, *dh
;
431 dh
= skb_header_pointer(skb
, dataoff
, sizeof(_dh
), &dh
);
434 state
= dccp_state_table
[CT_DCCP_ROLE_CLIENT
][dh
->dccph_type
][CT_DCCP_NONE
];
437 dn
= dccp_pernet(net
);
438 if (dn
->dccp_loose
== 0) {
439 msg
= "nf_ct_dccp: not picking up existing connection ";
442 case CT_DCCP_REQUEST
:
444 case CT_DCCP_INVALID
:
445 msg
= "nf_ct_dccp: invalid state transition ";
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;
458 if (LOG_INVALID(net
, IPPROTO_DCCP
))
459 nf_log_packet(net
, nf_ct_l3num(ct
), 0, skb
, NULL
, NULL
,
464 static u64
dccp_ack_seq(const struct dccp_hdr
*dh
)
466 const struct dccp_hdr_ack_bits
*dhack
;
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
);
473 static unsigned int *dccp_get_timeouts(struct net
*net
)
475 return dccp_pernet(net
)->dccp_timeout
;
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
)
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
;
489 dh
= skb_header_pointer(skb
, dataoff
, sizeof(_dh
), &dh
);
491 type
= dh
->dccph_type
;
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
);
500 spin_lock_bh(&ct
->lock
);
502 role
= ct
->proto
.dccp
.role
[dir
];
503 old_state
= ct
->proto
.dccp
.state
;
504 new_state
= dccp_state_table
[role
][type
][old_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
;
516 case CT_DCCP_RESPOND
:
517 if (old_state
== CT_DCCP_REQUEST
)
518 ct
->proto
.dccp
.handshake_seq
= dccp_hdr_seq(dh
);
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
);
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.
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
;
541 ct
->proto
.dccp
.last_dir
= dir
;
542 ct
->proto
.dccp
.last_pkt
= type
;
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 ");
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 ");
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
);
562 if (new_state
!= old_state
)
563 nf_conntrack_event_cache(IPCT_PROTOINFO
, ct
);
565 nf_ct_refresh_acct(ct
, ctinfo
, skb
, timeouts
[new_state
]);
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
)
575 struct dccp_hdr _dh
, *dh
;
576 unsigned int dccp_len
= skb
->len
- dataoff
;
580 dh
= skb_header_pointer(skb
, dataoff
, sizeof(_dh
), &dh
);
582 msg
= "nf_ct_dccp: short packet ";
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 ";
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 ";
601 if (net
->ct
.sysctl_checksum
&& hooknum
== NF_INET_PRE_ROUTING
&&
602 nf_checksum_partial(skb
, hooknum
, dataoff
, cscov
, IPPROTO_DCCP
,
604 msg
= "nf_ct_dccp: bad checksum ";
608 if (dh
->dccph_type
>= DCCP_PKT_INVALID
) {
609 msg
= "nf_ct_dccp: reserved packet type ";
616 if (LOG_INVALID(net
, IPPROTO_DCCP
))
617 nf_log_packet(net
, pf
, 0, skb
, NULL
, NULL
, NULL
, msg
);
621 static int dccp_print_tuple(struct seq_file
*s
,
622 const struct nf_conntrack_tuple
*tuple
)
624 return seq_printf(s
, "sport=%hu dport=%hu ",
625 ntohs(tuple
->src
.u
.dccp
.port
),
626 ntohs(tuple
->dst
.u
.dccp
.port
));
629 static int dccp_print_conntrack(struct seq_file
*s
, struct nf_conn
*ct
)
631 return seq_printf(s
, "%s ", dccp_state_names
[ct
->proto
.dccp
.state
]);
634 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
635 static int dccp_to_nlattr(struct sk_buff
*skb
, struct nlattr
*nla
,
638 struct nlattr
*nest_parms
;
640 spin_lock_bh(&ct
->lock
);
641 nest_parms
= nla_nest_start(skb
, CTA_PROTOINFO_DCCP
| NLA_F_NESTED
);
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
);
655 spin_unlock_bh(&ct
->lock
);
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
},
665 static int nlattr_to_dccp(struct nlattr
*cda
[], struct nf_conn
*ct
)
667 struct nlattr
*attr
= cda
[CTA_PROTOINFO_DCCP
];
668 struct nlattr
*tb
[CTA_PROTOINFO_DCCP_MAX
+ 1];
674 err
= nla_parse_nested(tb
, CTA_PROTOINFO_DCCP_MAX
, attr
,
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
) {
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
;
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
;
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
]));
699 spin_unlock_bh(&ct
->lock
);
703 static int dccp_nlattr_size(void)
705 return nla_total_size(0) /* CTA_PROTOINFO_DCCP */
706 + nla_policy_len(dccp_nla_policy
, CTA_PROTOINFO_DCCP_MAX
+ 1);
711 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
713 #include <linux/netfilter/nfnetlink.h>
714 #include <linux/netfilter/nfnetlink_cttimeout.h>
716 static int dccp_timeout_nlattr_to_obj(struct nlattr
*tb
[],
717 struct net
*net
, void *data
)
719 struct dccp_net
*dn
= dccp_pernet(net
);
720 unsigned int *timeouts
= data
;
723 /* set default DCCP timeouts. */
724 for (i
=0; i
<CT_DCCP_MAX
; i
++)
725 timeouts
[i
] = dn
->dccp_timeout
[i
];
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
++) {
730 timeouts
[i
] = ntohl(nla_get_be32(tb
[i
])) * HZ
;
737 dccp_timeout_obj_to_nlattr(struct sk_buff
*skb
, const void *data
)
739 const unsigned int *timeouts
= data
;
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
;
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
},
762 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
765 /* template, data assigned later */
766 static struct ctl_table dccp_sysctl_table
[] = {
768 .procname
= "nf_conntrack_dccp_timeout_request",
769 .maxlen
= sizeof(unsigned int),
771 .proc_handler
= proc_dointvec_jiffies
,
774 .procname
= "nf_conntrack_dccp_timeout_respond",
775 .maxlen
= sizeof(unsigned int),
777 .proc_handler
= proc_dointvec_jiffies
,
780 .procname
= "nf_conntrack_dccp_timeout_partopen",
781 .maxlen
= sizeof(unsigned int),
783 .proc_handler
= proc_dointvec_jiffies
,
786 .procname
= "nf_conntrack_dccp_timeout_open",
787 .maxlen
= sizeof(unsigned int),
789 .proc_handler
= proc_dointvec_jiffies
,
792 .procname
= "nf_conntrack_dccp_timeout_closereq",
793 .maxlen
= sizeof(unsigned int),
795 .proc_handler
= proc_dointvec_jiffies
,
798 .procname
= "nf_conntrack_dccp_timeout_closing",
799 .maxlen
= sizeof(unsigned int),
801 .proc_handler
= proc_dointvec_jiffies
,
804 .procname
= "nf_conntrack_dccp_timeout_timewait",
805 .maxlen
= sizeof(unsigned int),
807 .proc_handler
= proc_dointvec_jiffies
,
810 .procname
= "nf_conntrack_dccp_loose",
811 .maxlen
= sizeof(int),
813 .proc_handler
= proc_dointvec
,
817 #endif /* CONFIG_SYSCTL */
819 static int dccp_kmemdup_sysctl_table(struct net
*net
, struct nf_proto_net
*pn
,
826 pn
->ctl_table
= kmemdup(dccp_sysctl_table
,
827 sizeof(dccp_sysctl_table
),
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
;
841 /* Don't export sysctls to unprivileged users */
842 if (net
->user_ns
!= &init_user_ns
)
843 pn
->ctl_table
[0].procname
= NULL
;
848 static int dccp_init_net(struct net
*net
, u_int16_t proto
)
850 struct dccp_net
*dn
= dccp_pernet(net
);
851 struct nf_proto_net
*pn
= &dn
->pn
;
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
;
865 return dccp_kmemdup_sysctl_table(net
, pn
, dn
);
868 static struct nf_conntrack_l4proto dccp_proto4 __read_mostly
= {
870 .l4proto
= IPPROTO_DCCP
,
872 .pkt_to_tuple
= dccp_pkt_to_tuple
,
873 .invert_tuple
= dccp_invert_tuple
,
875 .packet
= dccp_packet
,
876 .get_timeouts
= dccp_get_timeouts
,
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
,
889 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_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
,
897 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
898 .net_id
= &dccp_net_id
,
899 .init_net
= dccp_init_net
,
902 static struct nf_conntrack_l4proto dccp_proto6 __read_mostly
= {
904 .l4proto
= IPPROTO_DCCP
,
906 .pkt_to_tuple
= dccp_pkt_to_tuple
,
907 .invert_tuple
= dccp_invert_tuple
,
909 .packet
= dccp_packet
,
910 .get_timeouts
= dccp_get_timeouts
,
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
,
923 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_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
,
931 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
932 .net_id
= &dccp_net_id
,
933 .init_net
= dccp_init_net
,
936 static __net_init
int dccp_net_init(struct net
*net
)
939 ret
= nf_ct_l4proto_pernet_register(net
, &dccp_proto4
);
941 pr_err("nf_conntrack_dccp4: pernet registration failed.\n");
944 ret
= nf_ct_l4proto_pernet_register(net
, &dccp_proto6
);
946 pr_err("nf_conntrack_dccp6: pernet registration failed.\n");
951 nf_ct_l4proto_pernet_unregister(net
, &dccp_proto4
);
956 static __net_exit
void dccp_net_exit(struct net
*net
)
958 nf_ct_l4proto_pernet_unregister(net
, &dccp_proto6
);
959 nf_ct_l4proto_pernet_unregister(net
, &dccp_proto4
);
962 static struct pernet_operations dccp_net_ops
= {
963 .init
= dccp_net_init
,
964 .exit
= dccp_net_exit
,
966 .size
= sizeof(struct dccp_net
),
969 static int __init
nf_conntrack_proto_dccp_init(void)
973 ret
= register_pernet_subsys(&dccp_net_ops
);
977 ret
= nf_ct_l4proto_register(&dccp_proto4
);
981 ret
= nf_ct_l4proto_register(&dccp_proto6
);
987 nf_ct_l4proto_unregister(&dccp_proto4
);
989 unregister_pernet_subsys(&dccp_net_ops
);
994 static void __exit
nf_conntrack_proto_dccp_fini(void)
996 nf_ct_l4proto_unregister(&dccp_proto6
);
997 nf_ct_l4proto_unregister(&dccp_proto4
);
998 unregister_pernet_subsys(&dccp_net_ops
);
1001 module_init(nf_conntrack_proto_dccp_init
);
1002 module_exit(nf_conntrack_proto_dccp_fini
);
1004 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1005 MODULE_DESCRIPTION("DCCP connection tracking protocol helper");
1006 MODULE_LICENSE("GPL");