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/init.h>
13 #include <linux/sysctl.h>
14 #include <linux/spinlock.h>
15 #include <linux/skbuff.h>
16 #include <linux/dccp.h>
17 #include <linux/slab.h>
19 #include <net/net_namespace.h>
20 #include <net/netns/generic.h>
22 #include <linux/netfilter/nfnetlink_conntrack.h>
23 #include <net/netfilter/nf_conntrack.h>
24 #include <net/netfilter/nf_conntrack_l4proto.h>
25 #include <net/netfilter/nf_conntrack_ecache.h>
26 #include <net/netfilter/nf_log.h>
28 /* Timeouts are based on values from RFC4340:
32 * 8.1.2. Client Request
34 * A client MAY give up on its DCCP-Requests after some time
35 * (3 minutes, for example).
39 * 8.1.3. Server Response
41 * It MAY also leave the RESPOND state for CLOSED after a timeout of
42 * not less than 4MSL (8 minutes);
46 * 8.1.5. Handshake Completion
48 * If the client remains in PARTOPEN for more than 4MSL (8 minutes),
49 * it SHOULD reset the connection with Reset Code 2, "Aborted".
53 * The DCCP timestamp overflows after 11.9 hours. If the connection
54 * stays idle this long the sequence number won't be recognized
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
69 * A server or client socket remains in this state for 2MSL (4 minutes)
70 * after the connection has been town down, ...
73 #define DCCP_MSL (2 * 60 * HZ)
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",
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
100 * DCCP state transition table
102 * The assumption is the same as for TCP tracking:
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.
108 * The following states exist:
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
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.
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
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
] = {
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
146 * sNO, sRQ, sRS, sPO. sOP, sCR, sCG, sTW, */
147 sRQ
, sRQ
, sRS
, sIG
, sIG
, sIG
, sIG
, sRQ
,
149 [DCCP_PKT_RESPONSE
] = {
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
161 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
162 sIV
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIV
,
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.)
175 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
176 sIV
, sIV
, sPO
, sPO
, sOP
, sCR
, sCG
, sIV
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.)
189 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
190 sIV
, sIV
, sIV
, sIV
, sOP
, sCR
, sCG
, sIV
,
192 [DCCP_PKT_DATAACK
] = {
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.)
203 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
204 sIV
, sIV
, sPO
, sPO
, sOP
, sCR
, sCG
, sIV
206 [DCCP_PKT_CLOSEREQ
] = {
208 * CLOSEREQ may only be sent by the server.
210 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
211 sIV
, sIV
, sIV
, sIV
, sIV
, sIV
, sIV
, sIV
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
224 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
225 sIV
, sIV
, sIV
, sCG
, sCG
, sCG
, sIV
, sIV
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)
238 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
239 sIV
, sTW
, sTW
, sTW
, sTW
, sTW
, sTW
, sIG
243 * We currently ignore Sync packets
245 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
246 sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
,
248 [DCCP_PKT_SYNCACK
] = {
250 * We currently ignore SyncAck packets
252 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
253 sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
,
256 [CT_DCCP_ROLE_SERVER
] = {
257 [DCCP_PKT_REQUEST
] = {
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
268 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
269 sIV
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sRQ
271 [DCCP_PKT_RESPONSE
] = {
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
282 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
283 sIV
, sRS
, sRS
, sIG
, sIG
, sIG
, sIG
, sIV
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.)
296 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
297 sIV
, sIV
, sIV
, sOP
, sOP
, sIV
, sCG
, sIV
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.)
310 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
311 sIV
, sIV
, sIV
, sOP
, sOP
, sIV
, sCG
, sIV
313 [DCCP_PKT_DATAACK
] = {
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.)
324 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
325 sIV
, sIV
, sIV
, sOP
, sOP
, sIV
, sCG
, sIV
327 [DCCP_PKT_CLOSEREQ
] = {
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
338 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
339 sIV
, sIV
, sIV
, sCR
, sCR
, sCR
, sCR
, sIV
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
352 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
353 sIV
, sIV
, sIV
, sCG
, sCG
, sIV
, sCG
, sIV
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.)
364 * sTW -> sIG Ignore (don't refresh timer)
366 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW, sTW */
367 sIV
, sTW
, sTW
, sTW
, sTW
, sTW
, sTW
, sTW
, sIG
371 * We currently ignore Sync packets
373 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
374 sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
,
376 [DCCP_PKT_SYNCACK
] = {
378 * We currently ignore SyncAck packets
380 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
381 sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
,
386 static inline struct nf_dccp_net
*dccp_pernet(struct net
*net
)
388 return &net
->ct
.nf_ct_proto
.dccp
;
391 static bool dccp_pkt_to_tuple(const struct sk_buff
*skb
, unsigned int dataoff
,
392 struct net
*net
, struct nf_conntrack_tuple
*tuple
)
394 struct dccp_hdr _hdr
, *dh
;
396 /* Actually only need first 4 bytes to get ports. */
397 dh
= skb_header_pointer(skb
, dataoff
, 4, &_hdr
);
401 tuple
->src
.u
.dccp
.port
= dh
->dccph_sport
;
402 tuple
->dst
.u
.dccp
.port
= dh
->dccph_dport
;
406 static bool dccp_invert_tuple(struct nf_conntrack_tuple
*inv
,
407 const struct nf_conntrack_tuple
*tuple
)
409 inv
->src
.u
.dccp
.port
= tuple
->dst
.u
.dccp
.port
;
410 inv
->dst
.u
.dccp
.port
= tuple
->src
.u
.dccp
.port
;
414 static bool dccp_new(struct nf_conn
*ct
, const struct sk_buff
*skb
,
415 unsigned int dataoff
, unsigned int *timeouts
)
417 struct net
*net
= nf_ct_net(ct
);
418 struct nf_dccp_net
*dn
;
419 struct dccp_hdr _dh
, *dh
;
423 dh
= skb_header_pointer(skb
, dataoff
, sizeof(_dh
), &_dh
);
426 state
= dccp_state_table
[CT_DCCP_ROLE_CLIENT
][dh
->dccph_type
][CT_DCCP_NONE
];
429 dn
= dccp_pernet(net
);
430 if (dn
->dccp_loose
== 0) {
431 msg
= "nf_ct_dccp: not picking up existing connection ";
434 case CT_DCCP_REQUEST
:
436 case CT_DCCP_INVALID
:
437 msg
= "nf_ct_dccp: invalid state transition ";
441 ct
->proto
.dccp
.role
[IP_CT_DIR_ORIGINAL
] = CT_DCCP_ROLE_CLIENT
;
442 ct
->proto
.dccp
.role
[IP_CT_DIR_REPLY
] = CT_DCCP_ROLE_SERVER
;
443 ct
->proto
.dccp
.state
= CT_DCCP_NONE
;
444 ct
->proto
.dccp
.last_pkt
= DCCP_PKT_REQUEST
;
445 ct
->proto
.dccp
.last_dir
= IP_CT_DIR_ORIGINAL
;
446 ct
->proto
.dccp
.handshake_seq
= 0;
450 if (LOG_INVALID(net
, IPPROTO_DCCP
))
451 nf_log_packet(net
, nf_ct_l3num(ct
), 0, skb
, NULL
, NULL
,
456 static u64
dccp_ack_seq(const struct dccp_hdr
*dh
)
458 const struct dccp_hdr_ack_bits
*dhack
;
460 dhack
= (void *)dh
+ __dccp_basic_hdr_len(dh
);
461 return ((u64
)ntohs(dhack
->dccph_ack_nr_high
) << 32) +
462 ntohl(dhack
->dccph_ack_nr_low
);
465 static unsigned int *dccp_get_timeouts(struct net
*net
)
467 return dccp_pernet(net
)->dccp_timeout
;
470 static int dccp_packet(struct nf_conn
*ct
, const struct sk_buff
*skb
,
471 unsigned int dataoff
, enum ip_conntrack_info ctinfo
,
472 u_int8_t pf
, unsigned int hooknum
,
473 unsigned int *timeouts
)
475 struct net
*net
= nf_ct_net(ct
);
476 enum ip_conntrack_dir dir
= CTINFO2DIR(ctinfo
);
477 struct dccp_hdr _dh
, *dh
;
478 u_int8_t type
, old_state
, new_state
;
479 enum ct_dccp_roles role
;
481 dh
= skb_header_pointer(skb
, dataoff
, sizeof(_dh
), &_dh
);
483 type
= dh
->dccph_type
;
485 if (type
== DCCP_PKT_RESET
&&
486 !test_bit(IPS_SEEN_REPLY_BIT
, &ct
->status
)) {
487 /* Tear down connection immediately if only reply is a RESET */
488 nf_ct_kill_acct(ct
, ctinfo
, skb
);
492 spin_lock_bh(&ct
->lock
);
494 role
= ct
->proto
.dccp
.role
[dir
];
495 old_state
= ct
->proto
.dccp
.state
;
496 new_state
= dccp_state_table
[role
][type
][old_state
];
499 case CT_DCCP_REQUEST
:
500 if (old_state
== CT_DCCP_TIMEWAIT
&&
501 role
== CT_DCCP_ROLE_SERVER
) {
502 /* Reincarnation in the reverse direction: reopen and
503 * reverse client/server roles. */
504 ct
->proto
.dccp
.role
[dir
] = CT_DCCP_ROLE_CLIENT
;
505 ct
->proto
.dccp
.role
[!dir
] = CT_DCCP_ROLE_SERVER
;
508 case CT_DCCP_RESPOND
:
509 if (old_state
== CT_DCCP_REQUEST
)
510 ct
->proto
.dccp
.handshake_seq
= dccp_hdr_seq(dh
);
512 case CT_DCCP_PARTOPEN
:
513 if (old_state
== CT_DCCP_RESPOND
&&
514 type
== DCCP_PKT_ACK
&&
515 dccp_ack_seq(dh
) == ct
->proto
.dccp
.handshake_seq
)
516 set_bit(IPS_ASSURED_BIT
, &ct
->status
);
520 * Connection tracking might be out of sync, so we ignore
521 * packets that might establish a new connection and resync
522 * if the server responds with a valid Response.
524 if (ct
->proto
.dccp
.last_dir
== !dir
&&
525 ct
->proto
.dccp
.last_pkt
== DCCP_PKT_REQUEST
&&
526 type
== DCCP_PKT_RESPONSE
) {
527 ct
->proto
.dccp
.role
[!dir
] = CT_DCCP_ROLE_CLIENT
;
528 ct
->proto
.dccp
.role
[dir
] = CT_DCCP_ROLE_SERVER
;
529 ct
->proto
.dccp
.handshake_seq
= dccp_hdr_seq(dh
);
530 new_state
= CT_DCCP_RESPOND
;
533 ct
->proto
.dccp
.last_dir
= dir
;
534 ct
->proto
.dccp
.last_pkt
= type
;
536 spin_unlock_bh(&ct
->lock
);
537 if (LOG_INVALID(net
, IPPROTO_DCCP
))
538 nf_log_packet(net
, pf
, 0, skb
, NULL
, NULL
, NULL
,
539 "nf_ct_dccp: invalid packet ignored ");
541 case CT_DCCP_INVALID
:
542 spin_unlock_bh(&ct
->lock
);
543 if (LOG_INVALID(net
, IPPROTO_DCCP
))
544 nf_log_packet(net
, pf
, 0, skb
, NULL
, NULL
, NULL
,
545 "nf_ct_dccp: invalid state transition ");
549 ct
->proto
.dccp
.last_dir
= dir
;
550 ct
->proto
.dccp
.last_pkt
= type
;
551 ct
->proto
.dccp
.state
= new_state
;
552 spin_unlock_bh(&ct
->lock
);
554 if (new_state
!= old_state
)
555 nf_conntrack_event_cache(IPCT_PROTOINFO
, ct
);
557 nf_ct_refresh_acct(ct
, ctinfo
, skb
, timeouts
[new_state
]);
562 static int dccp_error(struct net
*net
, struct nf_conn
*tmpl
,
563 struct sk_buff
*skb
, unsigned int dataoff
,
564 u_int8_t pf
, unsigned int hooknum
)
566 struct dccp_hdr _dh
, *dh
;
567 unsigned int dccp_len
= skb
->len
- dataoff
;
571 dh
= skb_header_pointer(skb
, dataoff
, sizeof(_dh
), &_dh
);
573 msg
= "nf_ct_dccp: short packet ";
577 if (dh
->dccph_doff
* 4 < sizeof(struct dccp_hdr
) ||
578 dh
->dccph_doff
* 4 > dccp_len
) {
579 msg
= "nf_ct_dccp: truncated/malformed packet ";
584 if (dh
->dccph_cscov
) {
585 cscov
= (dh
->dccph_cscov
- 1) * 4;
586 if (cscov
> dccp_len
) {
587 msg
= "nf_ct_dccp: bad checksum coverage ";
592 if (net
->ct
.sysctl_checksum
&& hooknum
== NF_INET_PRE_ROUTING
&&
593 nf_checksum_partial(skb
, hooknum
, dataoff
, cscov
, IPPROTO_DCCP
,
595 msg
= "nf_ct_dccp: bad checksum ";
599 if (dh
->dccph_type
>= DCCP_PKT_INVALID
) {
600 msg
= "nf_ct_dccp: reserved packet type ";
607 if (LOG_INVALID(net
, IPPROTO_DCCP
))
608 nf_log_packet(net
, pf
, 0, skb
, NULL
, NULL
, NULL
, "%s", msg
);
612 static bool dccp_can_early_drop(const struct nf_conn
*ct
)
614 switch (ct
->proto
.dccp
.state
) {
615 case CT_DCCP_CLOSEREQ
:
616 case CT_DCCP_CLOSING
:
617 case CT_DCCP_TIMEWAIT
:
626 static void dccp_print_tuple(struct seq_file
*s
,
627 const struct nf_conntrack_tuple
*tuple
)
629 seq_printf(s
, "sport=%hu dport=%hu ",
630 ntohs(tuple
->src
.u
.dccp
.port
),
631 ntohs(tuple
->dst
.u
.dccp
.port
));
634 static void dccp_print_conntrack(struct seq_file
*s
, struct nf_conn
*ct
)
636 seq_printf(s
, "%s ", dccp_state_names
[ct
->proto
.dccp
.state
]);
639 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
640 static int dccp_to_nlattr(struct sk_buff
*skb
, struct nlattr
*nla
,
643 struct nlattr
*nest_parms
;
645 spin_lock_bh(&ct
->lock
);
646 nest_parms
= nla_nest_start(skb
, CTA_PROTOINFO_DCCP
| NLA_F_NESTED
);
648 goto nla_put_failure
;
649 if (nla_put_u8(skb
, CTA_PROTOINFO_DCCP_STATE
, ct
->proto
.dccp
.state
) ||
650 nla_put_u8(skb
, CTA_PROTOINFO_DCCP_ROLE
,
651 ct
->proto
.dccp
.role
[IP_CT_DIR_ORIGINAL
]) ||
652 nla_put_be64(skb
, CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ
,
653 cpu_to_be64(ct
->proto
.dccp
.handshake_seq
),
654 CTA_PROTOINFO_DCCP_PAD
))
655 goto nla_put_failure
;
656 nla_nest_end(skb
, nest_parms
);
657 spin_unlock_bh(&ct
->lock
);
661 spin_unlock_bh(&ct
->lock
);
665 static const struct nla_policy dccp_nla_policy
[CTA_PROTOINFO_DCCP_MAX
+ 1] = {
666 [CTA_PROTOINFO_DCCP_STATE
] = { .type
= NLA_U8
},
667 [CTA_PROTOINFO_DCCP_ROLE
] = { .type
= NLA_U8
},
668 [CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ
] = { .type
= NLA_U64
},
669 [CTA_PROTOINFO_DCCP_PAD
] = { .type
= NLA_UNSPEC
},
672 static int nlattr_to_dccp(struct nlattr
*cda
[], struct nf_conn
*ct
)
674 struct nlattr
*attr
= cda
[CTA_PROTOINFO_DCCP
];
675 struct nlattr
*tb
[CTA_PROTOINFO_DCCP_MAX
+ 1];
681 err
= nla_parse_nested(tb
, CTA_PROTOINFO_DCCP_MAX
, attr
,
682 dccp_nla_policy
, NULL
);
686 if (!tb
[CTA_PROTOINFO_DCCP_STATE
] ||
687 !tb
[CTA_PROTOINFO_DCCP_ROLE
] ||
688 nla_get_u8(tb
[CTA_PROTOINFO_DCCP_ROLE
]) > CT_DCCP_ROLE_MAX
||
689 nla_get_u8(tb
[CTA_PROTOINFO_DCCP_STATE
]) >= CT_DCCP_IGNORE
) {
693 spin_lock_bh(&ct
->lock
);
694 ct
->proto
.dccp
.state
= nla_get_u8(tb
[CTA_PROTOINFO_DCCP_STATE
]);
695 if (nla_get_u8(tb
[CTA_PROTOINFO_DCCP_ROLE
]) == CT_DCCP_ROLE_CLIENT
) {
696 ct
->proto
.dccp
.role
[IP_CT_DIR_ORIGINAL
] = CT_DCCP_ROLE_CLIENT
;
697 ct
->proto
.dccp
.role
[IP_CT_DIR_REPLY
] = CT_DCCP_ROLE_SERVER
;
699 ct
->proto
.dccp
.role
[IP_CT_DIR_ORIGINAL
] = CT_DCCP_ROLE_SERVER
;
700 ct
->proto
.dccp
.role
[IP_CT_DIR_REPLY
] = CT_DCCP_ROLE_CLIENT
;
702 if (tb
[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ
]) {
703 ct
->proto
.dccp
.handshake_seq
=
704 be64_to_cpu(nla_get_be64(tb
[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ
]));
706 spin_unlock_bh(&ct
->lock
);
710 static int dccp_nlattr_size(void)
712 return nla_total_size(0) /* CTA_PROTOINFO_DCCP */
713 + nla_policy_len(dccp_nla_policy
, CTA_PROTOINFO_DCCP_MAX
+ 1);
718 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
720 #include <linux/netfilter/nfnetlink.h>
721 #include <linux/netfilter/nfnetlink_cttimeout.h>
723 static int dccp_timeout_nlattr_to_obj(struct nlattr
*tb
[],
724 struct net
*net
, void *data
)
726 struct nf_dccp_net
*dn
= dccp_pernet(net
);
727 unsigned int *timeouts
= data
;
730 /* set default DCCP timeouts. */
731 for (i
=0; i
<CT_DCCP_MAX
; i
++)
732 timeouts
[i
] = dn
->dccp_timeout
[i
];
734 /* there's a 1:1 mapping between attributes and protocol states. */
735 for (i
=CTA_TIMEOUT_DCCP_UNSPEC
+1; i
<CTA_TIMEOUT_DCCP_MAX
+1; i
++) {
737 timeouts
[i
] = ntohl(nla_get_be32(tb
[i
])) * HZ
;
744 dccp_timeout_obj_to_nlattr(struct sk_buff
*skb
, const void *data
)
746 const unsigned int *timeouts
= data
;
749 for (i
=CTA_TIMEOUT_DCCP_UNSPEC
+1; i
<CTA_TIMEOUT_DCCP_MAX
+1; i
++) {
750 if (nla_put_be32(skb
, i
, htonl(timeouts
[i
] / HZ
)))
751 goto nla_put_failure
;
759 static const struct nla_policy
760 dccp_timeout_nla_policy
[CTA_TIMEOUT_DCCP_MAX
+1] = {
761 [CTA_TIMEOUT_DCCP_REQUEST
] = { .type
= NLA_U32
},
762 [CTA_TIMEOUT_DCCP_RESPOND
] = { .type
= NLA_U32
},
763 [CTA_TIMEOUT_DCCP_PARTOPEN
] = { .type
= NLA_U32
},
764 [CTA_TIMEOUT_DCCP_OPEN
] = { .type
= NLA_U32
},
765 [CTA_TIMEOUT_DCCP_CLOSEREQ
] = { .type
= NLA_U32
},
766 [CTA_TIMEOUT_DCCP_CLOSING
] = { .type
= NLA_U32
},
767 [CTA_TIMEOUT_DCCP_TIMEWAIT
] = { .type
= NLA_U32
},
769 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
772 /* template, data assigned later */
773 static struct ctl_table dccp_sysctl_table
[] = {
775 .procname
= "nf_conntrack_dccp_timeout_request",
776 .maxlen
= sizeof(unsigned int),
778 .proc_handler
= proc_dointvec_jiffies
,
781 .procname
= "nf_conntrack_dccp_timeout_respond",
782 .maxlen
= sizeof(unsigned int),
784 .proc_handler
= proc_dointvec_jiffies
,
787 .procname
= "nf_conntrack_dccp_timeout_partopen",
788 .maxlen
= sizeof(unsigned int),
790 .proc_handler
= proc_dointvec_jiffies
,
793 .procname
= "nf_conntrack_dccp_timeout_open",
794 .maxlen
= sizeof(unsigned int),
796 .proc_handler
= proc_dointvec_jiffies
,
799 .procname
= "nf_conntrack_dccp_timeout_closereq",
800 .maxlen
= sizeof(unsigned int),
802 .proc_handler
= proc_dointvec_jiffies
,
805 .procname
= "nf_conntrack_dccp_timeout_closing",
806 .maxlen
= sizeof(unsigned int),
808 .proc_handler
= proc_dointvec_jiffies
,
811 .procname
= "nf_conntrack_dccp_timeout_timewait",
812 .maxlen
= sizeof(unsigned int),
814 .proc_handler
= proc_dointvec_jiffies
,
817 .procname
= "nf_conntrack_dccp_loose",
818 .maxlen
= sizeof(int),
820 .proc_handler
= proc_dointvec
,
824 #endif /* CONFIG_SYSCTL */
826 static int dccp_kmemdup_sysctl_table(struct net
*net
, struct nf_proto_net
*pn
,
827 struct nf_dccp_net
*dn
)
833 pn
->ctl_table
= kmemdup(dccp_sysctl_table
,
834 sizeof(dccp_sysctl_table
),
839 pn
->ctl_table
[0].data
= &dn
->dccp_timeout
[CT_DCCP_REQUEST
];
840 pn
->ctl_table
[1].data
= &dn
->dccp_timeout
[CT_DCCP_RESPOND
];
841 pn
->ctl_table
[2].data
= &dn
->dccp_timeout
[CT_DCCP_PARTOPEN
];
842 pn
->ctl_table
[3].data
= &dn
->dccp_timeout
[CT_DCCP_OPEN
];
843 pn
->ctl_table
[4].data
= &dn
->dccp_timeout
[CT_DCCP_CLOSEREQ
];
844 pn
->ctl_table
[5].data
= &dn
->dccp_timeout
[CT_DCCP_CLOSING
];
845 pn
->ctl_table
[6].data
= &dn
->dccp_timeout
[CT_DCCP_TIMEWAIT
];
846 pn
->ctl_table
[7].data
= &dn
->dccp_loose
;
848 /* Don't export sysctls to unprivileged users */
849 if (net
->user_ns
!= &init_user_ns
)
850 pn
->ctl_table
[0].procname
= NULL
;
855 static int dccp_init_net(struct net
*net
, u_int16_t proto
)
857 struct nf_dccp_net
*dn
= dccp_pernet(net
);
858 struct nf_proto_net
*pn
= &dn
->pn
;
863 dn
->dccp_timeout
[CT_DCCP_REQUEST
] = 2 * DCCP_MSL
;
864 dn
->dccp_timeout
[CT_DCCP_RESPOND
] = 4 * DCCP_MSL
;
865 dn
->dccp_timeout
[CT_DCCP_PARTOPEN
] = 4 * DCCP_MSL
;
866 dn
->dccp_timeout
[CT_DCCP_OPEN
] = 12 * 3600 * HZ
;
867 dn
->dccp_timeout
[CT_DCCP_CLOSEREQ
] = 64 * HZ
;
868 dn
->dccp_timeout
[CT_DCCP_CLOSING
] = 64 * HZ
;
869 dn
->dccp_timeout
[CT_DCCP_TIMEWAIT
] = 2 * DCCP_MSL
;
872 return dccp_kmemdup_sysctl_table(net
, pn
, dn
);
875 static struct nf_proto_net
*dccp_get_net_proto(struct net
*net
)
877 return &net
->ct
.nf_ct_proto
.dccp
.pn
;
880 struct nf_conntrack_l4proto nf_conntrack_l4proto_dccp4 __read_mostly
= {
882 .l4proto
= IPPROTO_DCCP
,
884 .pkt_to_tuple
= dccp_pkt_to_tuple
,
885 .invert_tuple
= dccp_invert_tuple
,
887 .packet
= dccp_packet
,
888 .get_timeouts
= dccp_get_timeouts
,
890 .can_early_drop
= dccp_can_early_drop
,
891 .print_tuple
= dccp_print_tuple
,
892 .print_conntrack
= dccp_print_conntrack
,
893 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
894 .to_nlattr
= dccp_to_nlattr
,
895 .nlattr_size
= dccp_nlattr_size
,
896 .from_nlattr
= nlattr_to_dccp
,
897 .tuple_to_nlattr
= nf_ct_port_tuple_to_nlattr
,
898 .nlattr_tuple_size
= nf_ct_port_nlattr_tuple_size
,
899 .nlattr_to_tuple
= nf_ct_port_nlattr_to_tuple
,
900 .nla_policy
= nf_ct_port_nla_policy
,
902 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
904 .nlattr_to_obj
= dccp_timeout_nlattr_to_obj
,
905 .obj_to_nlattr
= dccp_timeout_obj_to_nlattr
,
906 .nlattr_max
= CTA_TIMEOUT_DCCP_MAX
,
907 .obj_size
= sizeof(unsigned int) * CT_DCCP_MAX
,
908 .nla_policy
= dccp_timeout_nla_policy
,
910 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
911 .init_net
= dccp_init_net
,
912 .get_net_proto
= dccp_get_net_proto
,
914 EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_dccp4
);
916 struct nf_conntrack_l4proto nf_conntrack_l4proto_dccp6 __read_mostly
= {
918 .l4proto
= IPPROTO_DCCP
,
920 .pkt_to_tuple
= dccp_pkt_to_tuple
,
921 .invert_tuple
= dccp_invert_tuple
,
923 .packet
= dccp_packet
,
924 .get_timeouts
= dccp_get_timeouts
,
926 .can_early_drop
= dccp_can_early_drop
,
927 .print_tuple
= dccp_print_tuple
,
928 .print_conntrack
= dccp_print_conntrack
,
929 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
930 .to_nlattr
= dccp_to_nlattr
,
931 .nlattr_size
= dccp_nlattr_size
,
932 .from_nlattr
= nlattr_to_dccp
,
933 .tuple_to_nlattr
= nf_ct_port_tuple_to_nlattr
,
934 .nlattr_tuple_size
= nf_ct_port_nlattr_tuple_size
,
935 .nlattr_to_tuple
= nf_ct_port_nlattr_to_tuple
,
936 .nla_policy
= nf_ct_port_nla_policy
,
938 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
940 .nlattr_to_obj
= dccp_timeout_nlattr_to_obj
,
941 .obj_to_nlattr
= dccp_timeout_obj_to_nlattr
,
942 .nlattr_max
= CTA_TIMEOUT_DCCP_MAX
,
943 .obj_size
= sizeof(unsigned int) * CT_DCCP_MAX
,
944 .nla_policy
= dccp_timeout_nla_policy
,
946 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
947 .init_net
= dccp_init_net
,
948 .get_net_proto
= dccp_get_net_proto
,
950 EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_dccp6
);