1 // SPDX-License-Identifier: GPL-2.0-only
3 * DCCP connection tracking protocol helper
5 * Copyright (c) 2005, 2006, 2008 Patrick McHardy <kaber@trash.net>
7 #include <linux/kernel.h>
8 #include <linux/init.h>
9 #include <linux/sysctl.h>
10 #include <linux/spinlock.h>
11 #include <linux/skbuff.h>
12 #include <linux/dccp.h>
13 #include <linux/slab.h>
15 #include <net/net_namespace.h>
16 #include <net/netns/generic.h>
18 #include <linux/netfilter/nfnetlink_conntrack.h>
19 #include <net/netfilter/nf_conntrack.h>
20 #include <net/netfilter/nf_conntrack_l4proto.h>
21 #include <net/netfilter/nf_conntrack_ecache.h>
22 #include <net/netfilter/nf_conntrack_timeout.h>
23 #include <net/netfilter/nf_log.h>
25 /* Timeouts are based on values from RFC4340:
29 * 8.1.2. Client Request
31 * A client MAY give up on its DCCP-Requests after some time
32 * (3 minutes, for example).
36 * 8.1.3. Server Response
38 * It MAY also leave the RESPOND state for CLOSED after a timeout of
39 * not less than 4MSL (8 minutes);
43 * 8.1.5. Handshake Completion
45 * If the client remains in PARTOPEN for more than 4MSL (8 minutes),
46 * it SHOULD reset the connection with Reset Code 2, "Aborted".
50 * The DCCP timestamp overflows after 11.9 hours. If the connection
51 * stays idle this long the sequence number won't be recognized
58 * The retransmission timer should initially be set to go off in two
59 * round-trip times and should back off to not less than once every
66 * A server or client socket remains in this state for 2MSL (4 minutes)
67 * after the connection has been town down, ...
70 #define DCCP_MSL (2 * 60 * HZ)
72 static const char * const dccp_state_names
[] = {
73 [CT_DCCP_NONE
] = "NONE",
74 [CT_DCCP_REQUEST
] = "REQUEST",
75 [CT_DCCP_RESPOND
] = "RESPOND",
76 [CT_DCCP_PARTOPEN
] = "PARTOPEN",
77 [CT_DCCP_OPEN
] = "OPEN",
78 [CT_DCCP_CLOSEREQ
] = "CLOSEREQ",
79 [CT_DCCP_CLOSING
] = "CLOSING",
80 [CT_DCCP_TIMEWAIT
] = "TIMEWAIT",
81 [CT_DCCP_IGNORE
] = "IGNORE",
82 [CT_DCCP_INVALID
] = "INVALID",
85 #define sNO CT_DCCP_NONE
86 #define sRQ CT_DCCP_REQUEST
87 #define sRS CT_DCCP_RESPOND
88 #define sPO CT_DCCP_PARTOPEN
89 #define sOP CT_DCCP_OPEN
90 #define sCR CT_DCCP_CLOSEREQ
91 #define sCG CT_DCCP_CLOSING
92 #define sTW CT_DCCP_TIMEWAIT
93 #define sIG CT_DCCP_IGNORE
94 #define sIV CT_DCCP_INVALID
97 * DCCP state transition table
99 * The assumption is the same as for TCP tracking:
101 * We are the man in the middle. All the packets go through us but might
102 * get lost in transit to the destination. It is assumed that the destination
103 * can't receive segments we haven't seen.
105 * The following states exist:
107 * NONE: Initial state, expecting Request
108 * REQUEST: Request seen, waiting for Response from server
109 * RESPOND: Response from server seen, waiting for Ack from client
110 * PARTOPEN: Ack after Response seen, waiting for packet other than Response,
111 * Reset or Sync from server
112 * OPEN: Packet other than Response, Reset or Sync seen
113 * CLOSEREQ: CloseReq from server seen, expecting Close from client
114 * CLOSING: Close seen, expecting Reset
115 * TIMEWAIT: Reset seen
116 * IGNORE: Not determinable whether packet is valid
118 * Some states exist only on one side of the connection: REQUEST, RESPOND,
119 * PARTOPEN, CLOSEREQ. For the other side these states are equivalent to
120 * the one it was in before.
122 * Packets are marked as ignored (sIG) if we don't know if they're valid
123 * (for example a reincarnation of a connection we didn't notice is dead
124 * already) and the server may send back a connection closing Reset or a
125 * Response. They're also used for Sync/SyncAck packets, which we don't
128 static const u_int8_t
129 dccp_state_table
[CT_DCCP_ROLE_MAX
+ 1][DCCP_PKT_SYNCACK
+ 1][CT_DCCP_MAX
+ 1] = {
130 [CT_DCCP_ROLE_CLIENT
] = {
131 [DCCP_PKT_REQUEST
] = {
133 * sNO -> sRQ Regular Request
134 * sRQ -> sRQ Retransmitted Request or reincarnation
135 * sRS -> sRS Retransmitted Request (apparently Response
136 * got lost after we saw it) or reincarnation
137 * sPO -> sIG Ignore, conntrack might be out of sync
138 * sOP -> sIG Ignore, conntrack might be out of sync
139 * sCR -> sIG Ignore, conntrack might be out of sync
140 * sCG -> sIG Ignore, conntrack might be out of sync
141 * sTW -> sRQ Reincarnation
143 * sNO, sRQ, sRS, sPO. sOP, sCR, sCG, sTW, */
144 sRQ
, sRQ
, sRS
, sIG
, sIG
, sIG
, sIG
, sRQ
,
146 [DCCP_PKT_RESPONSE
] = {
149 * sRQ -> sIG Ignore, might be response to ignored Request
150 * sRS -> sIG Ignore, might be response to ignored Request
151 * sPO -> sIG Ignore, might be response to ignored Request
152 * sOP -> sIG Ignore, might be response to ignored Request
153 * sCR -> sIG Ignore, might be response to ignored Request
154 * sCG -> sIG Ignore, might be response to ignored Request
155 * sTW -> sIV Invalid, reincarnation in reverse direction
158 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
159 sIV
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIV
,
163 * sNO -> sIV No connection
164 * sRQ -> sIV No connection
165 * sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.)
166 * sPO -> sPO Retransmitted Ack for Response, remain in PARTOPEN
167 * sOP -> sOP Regular ACK, remain in OPEN
168 * sCR -> sCR Ack in CLOSEREQ MAY be processed (8.3.)
169 * sCG -> sCG Ack in CLOSING MAY be processed (8.3.)
172 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
173 sIV
, sIV
, sPO
, sPO
, sOP
, sCR
, sCG
, sIV
177 * sNO -> sIV No connection
178 * sRQ -> sIV No connection
179 * sRS -> sIV No connection
180 * sPO -> sIV MUST use DataAck in PARTOPEN state (8.1.5.)
181 * sOP -> sOP Regular Data packet
182 * sCR -> sCR Data in CLOSEREQ MAY be processed (8.3.)
183 * sCG -> sCG Data in CLOSING MAY be processed (8.3.)
186 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
187 sIV
, sIV
, sIV
, sIV
, sOP
, sCR
, sCG
, sIV
,
189 [DCCP_PKT_DATAACK
] = {
191 * sNO -> sIV No connection
192 * sRQ -> sIV No connection
193 * sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.)
194 * sPO -> sPO Remain in PARTOPEN state
195 * sOP -> sOP Regular DataAck packet in OPEN state
196 * sCR -> sCR DataAck in CLOSEREQ MAY be processed (8.3.)
197 * sCG -> sCG DataAck in CLOSING MAY be processed (8.3.)
200 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
201 sIV
, sIV
, sPO
, sPO
, sOP
, sCR
, sCG
, sIV
203 [DCCP_PKT_CLOSEREQ
] = {
205 * CLOSEREQ may only be sent by the server.
207 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
208 sIV
, sIV
, sIV
, sIV
, sIV
, sIV
, sIV
, sIV
212 * sNO -> sIV No connection
213 * sRQ -> sIV No connection
214 * sRS -> sIV No connection
215 * sPO -> sCG Client-initiated close
216 * sOP -> sCG Client-initiated close
217 * sCR -> sCG Close in response to CloseReq (8.3.)
218 * sCG -> sCG Retransmit
219 * sTW -> sIV Late retransmit, already in TIME_WAIT
221 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
222 sIV
, sIV
, sIV
, sCG
, sCG
, sCG
, sIV
, sIV
226 * sNO -> sIV No connection
227 * sRQ -> sTW Sync received or timeout, SHOULD send Reset (8.1.1.)
228 * sRS -> sTW Response received without Request
229 * sPO -> sTW Timeout, SHOULD send Reset (8.1.5.)
230 * sOP -> sTW Connection reset
231 * sCR -> sTW Connection reset
232 * sCG -> sTW Connection reset
233 * sTW -> sIG Ignore (don't refresh timer)
235 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
236 sIV
, sTW
, sTW
, sTW
, sTW
, sTW
, sTW
, sIG
240 * We currently ignore Sync packets
242 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
243 sIV
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
,
245 [DCCP_PKT_SYNCACK
] = {
247 * We currently ignore SyncAck packets
249 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
250 sIV
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
,
253 [CT_DCCP_ROLE_SERVER
] = {
254 [DCCP_PKT_REQUEST
] = {
257 * sRQ -> sIG Ignore, conntrack might be out of sync
258 * sRS -> sIG Ignore, conntrack might be out of sync
259 * sPO -> sIG Ignore, conntrack might be out of sync
260 * sOP -> sIG Ignore, conntrack might be out of sync
261 * sCR -> sIG Ignore, conntrack might be out of sync
262 * sCG -> sIG Ignore, conntrack might be out of sync
263 * sTW -> sRQ Reincarnation, must reverse roles
265 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
266 sIV
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sRQ
268 [DCCP_PKT_RESPONSE
] = {
270 * sNO -> sIV Response without Request
271 * sRQ -> sRS Response to clients Request
272 * sRS -> sRS Retransmitted Response (8.1.3. SHOULD NOT)
273 * sPO -> sIG Response to an ignored Request or late retransmit
274 * sOP -> sIG Ignore, might be response to ignored Request
275 * sCR -> sIG Ignore, might be response to ignored Request
276 * sCG -> sIG Ignore, might be response to ignored Request
277 * sTW -> sIV Invalid, Request from client in sTW moves to sRQ
279 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
280 sIV
, sRS
, sRS
, sIG
, sIG
, sIG
, sIG
, sIV
284 * sNO -> sIV No connection
285 * sRQ -> sIV No connection
286 * sRS -> sIV No connection
287 * sPO -> sOP Enter OPEN state (8.1.5.)
288 * sOP -> sOP Regular Ack in OPEN state
289 * sCR -> sIV Waiting for Close from client
290 * sCG -> sCG Ack in CLOSING MAY be processed (8.3.)
293 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
294 sIV
, sIV
, sIV
, sOP
, sOP
, sIV
, sCG
, sIV
298 * sNO -> sIV No connection
299 * sRQ -> sIV No connection
300 * sRS -> sIV No connection
301 * sPO -> sOP Enter OPEN state (8.1.5.)
302 * sOP -> sOP Regular Data packet in OPEN state
303 * sCR -> sIV Waiting for Close from client
304 * sCG -> sCG Data in CLOSING MAY be processed (8.3.)
307 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
308 sIV
, sIV
, sIV
, sOP
, sOP
, sIV
, sCG
, sIV
310 [DCCP_PKT_DATAACK
] = {
312 * sNO -> sIV No connection
313 * sRQ -> sIV No connection
314 * sRS -> sIV No connection
315 * sPO -> sOP Enter OPEN state (8.1.5.)
316 * sOP -> sOP Regular DataAck in OPEN state
317 * sCR -> sIV Waiting for Close from client
318 * sCG -> sCG Data in CLOSING MAY be processed (8.3.)
321 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
322 sIV
, sIV
, sIV
, sOP
, sOP
, sIV
, sCG
, sIV
324 [DCCP_PKT_CLOSEREQ
] = {
326 * sNO -> sIV No connection
327 * sRQ -> sIV No connection
328 * sRS -> sIV No connection
329 * sPO -> sOP -> sCR Move directly to CLOSEREQ (8.1.5.)
330 * sOP -> sCR CloseReq in OPEN state
331 * sCR -> sCR Retransmit
332 * sCG -> sCR Simultaneous close, client sends another Close
333 * sTW -> sIV Already closed
335 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
336 sIV
, sIV
, sIV
, sCR
, sCR
, sCR
, sCR
, sIV
340 * sNO -> sIV No connection
341 * sRQ -> sIV No connection
342 * sRS -> sIV No connection
343 * sPO -> sOP -> sCG Move direcly to CLOSING
344 * sOP -> sCG Move to CLOSING
345 * sCR -> sIV Close after CloseReq is invalid
346 * sCG -> sCG Retransmit
347 * sTW -> sIV Already closed
349 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
350 sIV
, sIV
, sIV
, sCG
, sCG
, sIV
, sCG
, sIV
354 * sNO -> sIV No connection
355 * sRQ -> sTW Reset in response to Request
356 * sRS -> sTW Timeout, SHOULD send Reset (8.1.3.)
357 * sPO -> sTW Timeout, SHOULD send Reset (8.1.3.)
361 * sTW -> sIG Ignore (don't refresh timer)
363 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW, sTW */
364 sIV
, sTW
, sTW
, sTW
, sTW
, sTW
, sTW
, sTW
, sIG
368 * We currently ignore Sync packets
370 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
371 sIV
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
,
373 [DCCP_PKT_SYNCACK
] = {
375 * We currently ignore SyncAck packets
377 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
378 sIV
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
, sIG
,
384 dccp_new(struct nf_conn
*ct
, const struct sk_buff
*skb
,
385 const struct dccp_hdr
*dh
)
387 struct net
*net
= nf_ct_net(ct
);
388 struct nf_dccp_net
*dn
;
392 state
= dccp_state_table
[CT_DCCP_ROLE_CLIENT
][dh
->dccph_type
][CT_DCCP_NONE
];
395 dn
= nf_dccp_pernet(net
);
396 if (dn
->dccp_loose
== 0) {
397 msg
= "not picking up existing connection ";
400 case CT_DCCP_REQUEST
:
402 case CT_DCCP_INVALID
:
403 msg
= "invalid state transition ";
407 ct
->proto
.dccp
.role
[IP_CT_DIR_ORIGINAL
] = CT_DCCP_ROLE_CLIENT
;
408 ct
->proto
.dccp
.role
[IP_CT_DIR_REPLY
] = CT_DCCP_ROLE_SERVER
;
409 ct
->proto
.dccp
.state
= CT_DCCP_NONE
;
410 ct
->proto
.dccp
.last_pkt
= DCCP_PKT_REQUEST
;
411 ct
->proto
.dccp
.last_dir
= IP_CT_DIR_ORIGINAL
;
412 ct
->proto
.dccp
.handshake_seq
= 0;
416 nf_ct_l4proto_log_invalid(skb
, ct
, "%s", msg
);
420 static u64
dccp_ack_seq(const struct dccp_hdr
*dh
)
422 const struct dccp_hdr_ack_bits
*dhack
;
424 dhack
= (void *)dh
+ __dccp_basic_hdr_len(dh
);
425 return ((u64
)ntohs(dhack
->dccph_ack_nr_high
) << 32) +
426 ntohl(dhack
->dccph_ack_nr_low
);
429 static bool dccp_error(const struct dccp_hdr
*dh
,
430 struct sk_buff
*skb
, unsigned int dataoff
,
431 const struct nf_hook_state
*state
)
433 unsigned int dccp_len
= skb
->len
- dataoff
;
437 if (dh
->dccph_doff
* 4 < sizeof(struct dccp_hdr
) ||
438 dh
->dccph_doff
* 4 > dccp_len
) {
439 msg
= "nf_ct_dccp: truncated/malformed packet ";
444 if (dh
->dccph_cscov
) {
445 cscov
= (dh
->dccph_cscov
- 1) * 4;
446 if (cscov
> dccp_len
) {
447 msg
= "nf_ct_dccp: bad checksum coverage ";
452 if (state
->hook
== NF_INET_PRE_ROUTING
&&
453 state
->net
->ct
.sysctl_checksum
&&
454 nf_checksum_partial(skb
, state
->hook
, dataoff
, cscov
,
455 IPPROTO_DCCP
, state
->pf
)) {
456 msg
= "nf_ct_dccp: bad checksum ";
460 if (dh
->dccph_type
>= DCCP_PKT_INVALID
) {
461 msg
= "nf_ct_dccp: reserved packet type ";
466 nf_l4proto_log_invalid(skb
, state
->net
, state
->pf
,
467 IPPROTO_DCCP
, "%s", msg
);
471 int nf_conntrack_dccp_packet(struct nf_conn
*ct
, struct sk_buff
*skb
,
472 unsigned int dataoff
,
473 enum ip_conntrack_info ctinfo
,
474 const struct nf_hook_state
*state
)
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
;
480 unsigned int *timeouts
;
482 dh
= skb_header_pointer(skb
, dataoff
, sizeof(_dh
), &_dh
);
486 if (dccp_error(dh
, skb
, dataoff
, state
))
489 type
= dh
->dccph_type
;
490 if (!nf_ct_is_confirmed(ct
) && !dccp_new(ct
, skb
, dh
))
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 nf_ct_l4proto_log_invalid(skb
, ct
, "%s", "invalid packet");
547 case CT_DCCP_INVALID
:
548 spin_unlock_bh(&ct
->lock
);
549 nf_ct_l4proto_log_invalid(skb
, ct
, "%s", "invalid state transition");
553 ct
->proto
.dccp
.last_dir
= dir
;
554 ct
->proto
.dccp
.last_pkt
= type
;
555 ct
->proto
.dccp
.state
= new_state
;
556 spin_unlock_bh(&ct
->lock
);
558 if (new_state
!= old_state
)
559 nf_conntrack_event_cache(IPCT_PROTOINFO
, ct
);
561 timeouts
= nf_ct_timeout_lookup(ct
);
563 timeouts
= nf_dccp_pernet(nf_ct_net(ct
))->dccp_timeout
;
564 nf_ct_refresh_acct(ct
, ctinfo
, skb
, timeouts
[new_state
]);
569 static bool dccp_can_early_drop(const struct nf_conn
*ct
)
571 switch (ct
->proto
.dccp
.state
) {
572 case CT_DCCP_CLOSEREQ
:
573 case CT_DCCP_CLOSING
:
574 case CT_DCCP_TIMEWAIT
:
583 #ifdef CONFIG_NF_CONNTRACK_PROCFS
584 static void dccp_print_conntrack(struct seq_file
*s
, struct nf_conn
*ct
)
586 seq_printf(s
, "%s ", dccp_state_names
[ct
->proto
.dccp
.state
]);
590 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
591 static int dccp_to_nlattr(struct sk_buff
*skb
, struct nlattr
*nla
,
592 struct nf_conn
*ct
, bool destroy
)
594 struct nlattr
*nest_parms
;
596 spin_lock_bh(&ct
->lock
);
597 nest_parms
= nla_nest_start(skb
, CTA_PROTOINFO_DCCP
);
599 goto nla_put_failure
;
600 if (nla_put_u8(skb
, CTA_PROTOINFO_DCCP_STATE
, ct
->proto
.dccp
.state
))
601 goto nla_put_failure
;
606 if (nla_put_u8(skb
, CTA_PROTOINFO_DCCP_ROLE
,
607 ct
->proto
.dccp
.role
[IP_CT_DIR_ORIGINAL
]) ||
608 nla_put_be64(skb
, CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ
,
609 cpu_to_be64(ct
->proto
.dccp
.handshake_seq
),
610 CTA_PROTOINFO_DCCP_PAD
))
611 goto nla_put_failure
;
613 nla_nest_end(skb
, nest_parms
);
614 spin_unlock_bh(&ct
->lock
);
619 spin_unlock_bh(&ct
->lock
);
623 static const struct nla_policy dccp_nla_policy
[CTA_PROTOINFO_DCCP_MAX
+ 1] = {
624 [CTA_PROTOINFO_DCCP_STATE
] = { .type
= NLA_U8
},
625 [CTA_PROTOINFO_DCCP_ROLE
] = { .type
= NLA_U8
},
626 [CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ
] = { .type
= NLA_U64
},
627 [CTA_PROTOINFO_DCCP_PAD
] = { .type
= NLA_UNSPEC
},
630 #define DCCP_NLATTR_SIZE ( \
631 NLA_ALIGN(NLA_HDRLEN + 1) + \
632 NLA_ALIGN(NLA_HDRLEN + 1) + \
633 NLA_ALIGN(NLA_HDRLEN + sizeof(u64)) + \
634 NLA_ALIGN(NLA_HDRLEN + 0))
636 static int nlattr_to_dccp(struct nlattr
*cda
[], struct nf_conn
*ct
)
638 struct nlattr
*attr
= cda
[CTA_PROTOINFO_DCCP
];
639 struct nlattr
*tb
[CTA_PROTOINFO_DCCP_MAX
+ 1];
645 err
= nla_parse_nested_deprecated(tb
, CTA_PROTOINFO_DCCP_MAX
, attr
,
646 dccp_nla_policy
, NULL
);
650 if (!tb
[CTA_PROTOINFO_DCCP_STATE
] ||
651 !tb
[CTA_PROTOINFO_DCCP_ROLE
] ||
652 nla_get_u8(tb
[CTA_PROTOINFO_DCCP_ROLE
]) > CT_DCCP_ROLE_MAX
||
653 nla_get_u8(tb
[CTA_PROTOINFO_DCCP_STATE
]) >= CT_DCCP_IGNORE
) {
657 spin_lock_bh(&ct
->lock
);
658 ct
->proto
.dccp
.state
= nla_get_u8(tb
[CTA_PROTOINFO_DCCP_STATE
]);
659 if (nla_get_u8(tb
[CTA_PROTOINFO_DCCP_ROLE
]) == CT_DCCP_ROLE_CLIENT
) {
660 ct
->proto
.dccp
.role
[IP_CT_DIR_ORIGINAL
] = CT_DCCP_ROLE_CLIENT
;
661 ct
->proto
.dccp
.role
[IP_CT_DIR_REPLY
] = CT_DCCP_ROLE_SERVER
;
663 ct
->proto
.dccp
.role
[IP_CT_DIR_ORIGINAL
] = CT_DCCP_ROLE_SERVER
;
664 ct
->proto
.dccp
.role
[IP_CT_DIR_REPLY
] = CT_DCCP_ROLE_CLIENT
;
666 if (tb
[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ
]) {
667 ct
->proto
.dccp
.handshake_seq
=
668 be64_to_cpu(nla_get_be64(tb
[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ
]));
670 spin_unlock_bh(&ct
->lock
);
675 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
677 #include <linux/netfilter/nfnetlink.h>
678 #include <linux/netfilter/nfnetlink_cttimeout.h>
680 static int dccp_timeout_nlattr_to_obj(struct nlattr
*tb
[],
681 struct net
*net
, void *data
)
683 struct nf_dccp_net
*dn
= nf_dccp_pernet(net
);
684 unsigned int *timeouts
= data
;
688 timeouts
= dn
->dccp_timeout
;
690 /* set default DCCP timeouts. */
691 for (i
=0; i
<CT_DCCP_MAX
; i
++)
692 timeouts
[i
] = dn
->dccp_timeout
[i
];
694 /* there's a 1:1 mapping between attributes and protocol states. */
695 for (i
=CTA_TIMEOUT_DCCP_UNSPEC
+1; i
<CTA_TIMEOUT_DCCP_MAX
+1; i
++) {
697 timeouts
[i
] = ntohl(nla_get_be32(tb
[i
])) * HZ
;
701 timeouts
[CTA_TIMEOUT_DCCP_UNSPEC
] = timeouts
[CTA_TIMEOUT_DCCP_REQUEST
];
706 dccp_timeout_obj_to_nlattr(struct sk_buff
*skb
, const void *data
)
708 const unsigned int *timeouts
= data
;
711 for (i
=CTA_TIMEOUT_DCCP_UNSPEC
+1; i
<CTA_TIMEOUT_DCCP_MAX
+1; i
++) {
712 if (nla_put_be32(skb
, i
, htonl(timeouts
[i
] / HZ
)))
713 goto nla_put_failure
;
721 static const struct nla_policy
722 dccp_timeout_nla_policy
[CTA_TIMEOUT_DCCP_MAX
+1] = {
723 [CTA_TIMEOUT_DCCP_REQUEST
] = { .type
= NLA_U32
},
724 [CTA_TIMEOUT_DCCP_RESPOND
] = { .type
= NLA_U32
},
725 [CTA_TIMEOUT_DCCP_PARTOPEN
] = { .type
= NLA_U32
},
726 [CTA_TIMEOUT_DCCP_OPEN
] = { .type
= NLA_U32
},
727 [CTA_TIMEOUT_DCCP_CLOSEREQ
] = { .type
= NLA_U32
},
728 [CTA_TIMEOUT_DCCP_CLOSING
] = { .type
= NLA_U32
},
729 [CTA_TIMEOUT_DCCP_TIMEWAIT
] = { .type
= NLA_U32
},
731 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
733 void nf_conntrack_dccp_init_net(struct net
*net
)
735 struct nf_dccp_net
*dn
= nf_dccp_pernet(net
);
739 dn
->dccp_timeout
[CT_DCCP_REQUEST
] = 2 * DCCP_MSL
;
740 dn
->dccp_timeout
[CT_DCCP_RESPOND
] = 4 * DCCP_MSL
;
741 dn
->dccp_timeout
[CT_DCCP_PARTOPEN
] = 4 * DCCP_MSL
;
742 dn
->dccp_timeout
[CT_DCCP_OPEN
] = 12 * 3600 * HZ
;
743 dn
->dccp_timeout
[CT_DCCP_CLOSEREQ
] = 64 * HZ
;
744 dn
->dccp_timeout
[CT_DCCP_CLOSING
] = 64 * HZ
;
745 dn
->dccp_timeout
[CT_DCCP_TIMEWAIT
] = 2 * DCCP_MSL
;
747 /* timeouts[0] is unused, make it same as SYN_SENT so
748 * ->timeouts[0] contains 'new' timeout, like udp or icmp.
750 dn
->dccp_timeout
[CT_DCCP_NONE
] = dn
->dccp_timeout
[CT_DCCP_REQUEST
];
753 const struct nf_conntrack_l4proto nf_conntrack_l4proto_dccp
= {
754 .l4proto
= IPPROTO_DCCP
,
755 .can_early_drop
= dccp_can_early_drop
,
756 #ifdef CONFIG_NF_CONNTRACK_PROCFS
757 .print_conntrack
= dccp_print_conntrack
,
759 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
760 .nlattr_size
= DCCP_NLATTR_SIZE
,
761 .to_nlattr
= dccp_to_nlattr
,
762 .from_nlattr
= nlattr_to_dccp
,
763 .tuple_to_nlattr
= nf_ct_port_tuple_to_nlattr
,
764 .nlattr_tuple_size
= nf_ct_port_nlattr_tuple_size
,
765 .nlattr_to_tuple
= nf_ct_port_nlattr_to_tuple
,
766 .nla_policy
= nf_ct_port_nla_policy
,
768 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
770 .nlattr_to_obj
= dccp_timeout_nlattr_to_obj
,
771 .obj_to_nlattr
= dccp_timeout_obj_to_nlattr
,
772 .nlattr_max
= CTA_TIMEOUT_DCCP_MAX
,
773 .obj_size
= sizeof(unsigned int) * CT_DCCP_MAX
,
774 .nla_policy
= dccp_timeout_nla_policy
,
776 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */