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_conntrack_timeout.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 sIV, 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 sIV, 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 sIV, 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 sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
387 static inline struct nf_dccp_net *dccp_pernet(struct net *net)
389 return &net->ct.nf_ct_proto.dccp;
392 static bool dccp_new(struct nf_conn *ct, const struct sk_buff *skb,
393 unsigned int dataoff)
395 struct net *net = nf_ct_net(ct);
396 struct nf_dccp_net *dn;
397 struct dccp_hdr _dh, *dh;
401 dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh);
404 state = dccp_state_table[CT_DCCP_ROLE_CLIENT][dh->dccph_type][CT_DCCP_NONE];
407 dn = dccp_pernet(net);
408 if (dn->dccp_loose == 0) {
409 msg = "not picking up existing connection ";
412 case CT_DCCP_REQUEST:
414 case CT_DCCP_INVALID:
415 msg = "invalid state transition ";
419 ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT;
420 ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER;
421 ct->proto.dccp.state = CT_DCCP_NONE;
422 ct->proto.dccp.last_pkt = DCCP_PKT_REQUEST;
423 ct->proto.dccp.last_dir = IP_CT_DIR_ORIGINAL;
424 ct->proto.dccp.handshake_seq = 0;
428 nf_ct_l4proto_log_invalid(skb, ct, "%s", msg);
432 static u64 dccp_ack_seq(const struct dccp_hdr *dh)
434 const struct dccp_hdr_ack_bits *dhack;
436 dhack = (void *)dh + __dccp_basic_hdr_len(dh);
437 return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) +
438 ntohl(dhack->dccph_ack_nr_low);
441 static int dccp_packet(struct nf_conn *ct, const struct sk_buff *skb,
442 unsigned int dataoff, enum ip_conntrack_info ctinfo)
444 enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
445 struct dccp_hdr _dh, *dh;
446 u_int8_t type, old_state, new_state;
447 enum ct_dccp_roles role;
448 unsigned int *timeouts;
450 dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh);
452 type = dh->dccph_type;
454 if (type == DCCP_PKT_RESET &&
455 !test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
456 /* Tear down connection immediately if only reply is a RESET */
457 nf_ct_kill_acct(ct, ctinfo, skb);
461 spin_lock_bh(&ct->lock);
463 role = ct->proto.dccp.role[dir];
464 old_state = ct->proto.dccp.state;
465 new_state = dccp_state_table[role][type][old_state];
468 case CT_DCCP_REQUEST:
469 if (old_state == CT_DCCP_TIMEWAIT &&
470 role == CT_DCCP_ROLE_SERVER) {
471 /* Reincarnation in the reverse direction: reopen and
472 * reverse client/server roles. */
473 ct->proto.dccp.role[dir] = CT_DCCP_ROLE_CLIENT;
474 ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_SERVER;
477 case CT_DCCP_RESPOND:
478 if (old_state == CT_DCCP_REQUEST)
479 ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh);
481 case CT_DCCP_PARTOPEN:
482 if (old_state == CT_DCCP_RESPOND &&
483 type == DCCP_PKT_ACK &&
484 dccp_ack_seq(dh) == ct->proto.dccp.handshake_seq)
485 set_bit(IPS_ASSURED_BIT, &ct->status);
489 * Connection tracking might be out of sync, so we ignore
490 * packets that might establish a new connection and resync
491 * if the server responds with a valid Response.
493 if (ct->proto.dccp.last_dir == !dir &&
494 ct->proto.dccp.last_pkt == DCCP_PKT_REQUEST &&
495 type == DCCP_PKT_RESPONSE) {
496 ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_CLIENT;
497 ct->proto.dccp.role[dir] = CT_DCCP_ROLE_SERVER;
498 ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh);
499 new_state = CT_DCCP_RESPOND;
502 ct->proto.dccp.last_dir = dir;
503 ct->proto.dccp.last_pkt = type;
505 spin_unlock_bh(&ct->lock);
506 nf_ct_l4proto_log_invalid(skb, ct, "%s", "invalid packet");
508 case CT_DCCP_INVALID:
509 spin_unlock_bh(&ct->lock);
510 nf_ct_l4proto_log_invalid(skb, ct, "%s", "invalid state transition");
514 ct->proto.dccp.last_dir = dir;
515 ct->proto.dccp.last_pkt = type;
516 ct->proto.dccp.state = new_state;
517 spin_unlock_bh(&ct->lock);
519 if (new_state != old_state)
520 nf_conntrack_event_cache(IPCT_PROTOINFO, ct);
522 timeouts = nf_ct_timeout_lookup(ct);
524 timeouts = dccp_pernet(nf_ct_net(ct))->dccp_timeout;
525 nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]);
530 static int dccp_error(struct net *net, struct nf_conn *tmpl,
531 struct sk_buff *skb, unsigned int dataoff,
532 u_int8_t pf, unsigned int hooknum)
534 struct dccp_hdr _dh, *dh;
535 unsigned int dccp_len = skb->len - dataoff;
539 dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh);
541 msg = "nf_ct_dccp: short packet ";
545 if (dh->dccph_doff * 4 < sizeof(struct dccp_hdr) ||
546 dh->dccph_doff * 4 > dccp_len) {
547 msg = "nf_ct_dccp: truncated/malformed packet ";
552 if (dh->dccph_cscov) {
553 cscov = (dh->dccph_cscov - 1) * 4;
554 if (cscov > dccp_len) {
555 msg = "nf_ct_dccp: bad checksum coverage ";
560 if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
561 nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_DCCP,
563 msg = "nf_ct_dccp: bad checksum ";
567 if (dh->dccph_type >= DCCP_PKT_INVALID) {
568 msg = "nf_ct_dccp: reserved packet type ";
575 nf_l4proto_log_invalid(skb, net, pf, IPPROTO_DCCP, "%s", msg);
579 static bool dccp_can_early_drop(const struct nf_conn *ct)
581 switch (ct->proto.dccp.state) {
582 case CT_DCCP_CLOSEREQ:
583 case CT_DCCP_CLOSING:
584 case CT_DCCP_TIMEWAIT:
593 #ifdef CONFIG_NF_CONNTRACK_PROCFS
594 static void dccp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
596 seq_printf(s, "%s ", dccp_state_names[ct->proto.dccp.state]);
600 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
601 static int dccp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
604 struct nlattr *nest_parms;
606 spin_lock_bh(&ct->lock);
607 nest_parms = nla_nest_start(skb, CTA_PROTOINFO_DCCP | NLA_F_NESTED);
609 goto nla_put_failure;
610 if (nla_put_u8(skb, CTA_PROTOINFO_DCCP_STATE, ct->proto.dccp.state) ||
611 nla_put_u8(skb, CTA_PROTOINFO_DCCP_ROLE,
612 ct->proto.dccp.role[IP_CT_DIR_ORIGINAL]) ||
613 nla_put_be64(skb, CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ,
614 cpu_to_be64(ct->proto.dccp.handshake_seq),
615 CTA_PROTOINFO_DCCP_PAD))
616 goto nla_put_failure;
617 nla_nest_end(skb, nest_parms);
618 spin_unlock_bh(&ct->lock);
622 spin_unlock_bh(&ct->lock);
626 static const struct nla_policy dccp_nla_policy[CTA_PROTOINFO_DCCP_MAX + 1] = {
627 [CTA_PROTOINFO_DCCP_STATE] = { .type = NLA_U8 },
628 [CTA_PROTOINFO_DCCP_ROLE] = { .type = NLA_U8 },
629 [CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ] = { .type = NLA_U64 },
630 [CTA_PROTOINFO_DCCP_PAD] = { .type = NLA_UNSPEC },
633 #define DCCP_NLATTR_SIZE ( \
634 NLA_ALIGN(NLA_HDRLEN + 1) + \
635 NLA_ALIGN(NLA_HDRLEN + 1) + \
636 NLA_ALIGN(NLA_HDRLEN + sizeof(u64)) + \
637 NLA_ALIGN(NLA_HDRLEN + 0))
639 static int nlattr_to_dccp(struct nlattr *cda[], struct nf_conn *ct)
641 struct nlattr *attr = cda[CTA_PROTOINFO_DCCP];
642 struct nlattr *tb[CTA_PROTOINFO_DCCP_MAX + 1];
648 err = nla_parse_nested(tb, CTA_PROTOINFO_DCCP_MAX, attr,
649 dccp_nla_policy, NULL);
653 if (!tb[CTA_PROTOINFO_DCCP_STATE] ||
654 !tb[CTA_PROTOINFO_DCCP_ROLE] ||
655 nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) > CT_DCCP_ROLE_MAX ||
656 nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]) >= CT_DCCP_IGNORE) {
660 spin_lock_bh(&ct->lock);
661 ct->proto.dccp.state = nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]);
662 if (nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) == CT_DCCP_ROLE_CLIENT) {
663 ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT;
664 ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER;
666 ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_SERVER;
667 ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_CLIENT;
669 if (tb[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ]) {
670 ct->proto.dccp.handshake_seq =
671 be64_to_cpu(nla_get_be64(tb[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ]));
673 spin_unlock_bh(&ct->lock);
678 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
680 #include <linux/netfilter/nfnetlink.h>
681 #include <linux/netfilter/nfnetlink_cttimeout.h>
683 static int dccp_timeout_nlattr_to_obj(struct nlattr *tb[],
684 struct net *net, void *data)
686 struct nf_dccp_net *dn = dccp_pernet(net);
687 unsigned int *timeouts = data;
691 timeouts = dn->dccp_timeout;
693 /* set default DCCP timeouts. */
694 for (i=0; i<CT_DCCP_MAX; i++)
695 timeouts[i] = dn->dccp_timeout[i];
697 /* there's a 1:1 mapping between attributes and protocol states. */
698 for (i=CTA_TIMEOUT_DCCP_UNSPEC+1; i<CTA_TIMEOUT_DCCP_MAX+1; i++) {
700 timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ;
704 timeouts[CTA_TIMEOUT_DCCP_UNSPEC] = timeouts[CTA_TIMEOUT_DCCP_REQUEST];
709 dccp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
711 const unsigned int *timeouts = data;
714 for (i=CTA_TIMEOUT_DCCP_UNSPEC+1; i<CTA_TIMEOUT_DCCP_MAX+1; i++) {
715 if (nla_put_be32(skb, i, htonl(timeouts[i] / HZ)))
716 goto nla_put_failure;
724 static const struct nla_policy
725 dccp_timeout_nla_policy[CTA_TIMEOUT_DCCP_MAX+1] = {
726 [CTA_TIMEOUT_DCCP_REQUEST] = { .type = NLA_U32 },
727 [CTA_TIMEOUT_DCCP_RESPOND] = { .type = NLA_U32 },
728 [CTA_TIMEOUT_DCCP_PARTOPEN] = { .type = NLA_U32 },
729 [CTA_TIMEOUT_DCCP_OPEN] = { .type = NLA_U32 },
730 [CTA_TIMEOUT_DCCP_CLOSEREQ] = { .type = NLA_U32 },
731 [CTA_TIMEOUT_DCCP_CLOSING] = { .type = NLA_U32 },
732 [CTA_TIMEOUT_DCCP_TIMEWAIT] = { .type = NLA_U32 },
734 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
737 /* template, data assigned later */
738 static struct ctl_table dccp_sysctl_table[] = {
740 .procname = "nf_conntrack_dccp_timeout_request",
741 .maxlen = sizeof(unsigned int),
743 .proc_handler = proc_dointvec_jiffies,
746 .procname = "nf_conntrack_dccp_timeout_respond",
747 .maxlen = sizeof(unsigned int),
749 .proc_handler = proc_dointvec_jiffies,
752 .procname = "nf_conntrack_dccp_timeout_partopen",
753 .maxlen = sizeof(unsigned int),
755 .proc_handler = proc_dointvec_jiffies,
758 .procname = "nf_conntrack_dccp_timeout_open",
759 .maxlen = sizeof(unsigned int),
761 .proc_handler = proc_dointvec_jiffies,
764 .procname = "nf_conntrack_dccp_timeout_closereq",
765 .maxlen = sizeof(unsigned int),
767 .proc_handler = proc_dointvec_jiffies,
770 .procname = "nf_conntrack_dccp_timeout_closing",
771 .maxlen = sizeof(unsigned int),
773 .proc_handler = proc_dointvec_jiffies,
776 .procname = "nf_conntrack_dccp_timeout_timewait",
777 .maxlen = sizeof(unsigned int),
779 .proc_handler = proc_dointvec_jiffies,
782 .procname = "nf_conntrack_dccp_loose",
783 .maxlen = sizeof(int),
785 .proc_handler = proc_dointvec,
789 #endif /* CONFIG_SYSCTL */
791 static int dccp_kmemdup_sysctl_table(struct net *net, struct nf_proto_net *pn,
792 struct nf_dccp_net *dn)
798 pn->ctl_table = kmemdup(dccp_sysctl_table,
799 sizeof(dccp_sysctl_table),
804 pn->ctl_table[0].data = &dn->dccp_timeout[CT_DCCP_REQUEST];
805 pn->ctl_table[1].data = &dn->dccp_timeout[CT_DCCP_RESPOND];
806 pn->ctl_table[2].data = &dn->dccp_timeout[CT_DCCP_PARTOPEN];
807 pn->ctl_table[3].data = &dn->dccp_timeout[CT_DCCP_OPEN];
808 pn->ctl_table[4].data = &dn->dccp_timeout[CT_DCCP_CLOSEREQ];
809 pn->ctl_table[5].data = &dn->dccp_timeout[CT_DCCP_CLOSING];
810 pn->ctl_table[6].data = &dn->dccp_timeout[CT_DCCP_TIMEWAIT];
811 pn->ctl_table[7].data = &dn->dccp_loose;
813 /* Don't export sysctls to unprivileged users */
814 if (net->user_ns != &init_user_ns)
815 pn->ctl_table[0].procname = NULL;
820 static int dccp_init_net(struct net *net, u_int16_t proto)
822 struct nf_dccp_net *dn = dccp_pernet(net);
823 struct nf_proto_net *pn = &dn->pn;
828 dn->dccp_timeout[CT_DCCP_REQUEST] = 2 * DCCP_MSL;
829 dn->dccp_timeout[CT_DCCP_RESPOND] = 4 * DCCP_MSL;
830 dn->dccp_timeout[CT_DCCP_PARTOPEN] = 4 * DCCP_MSL;
831 dn->dccp_timeout[CT_DCCP_OPEN] = 12 * 3600 * HZ;
832 dn->dccp_timeout[CT_DCCP_CLOSEREQ] = 64 * HZ;
833 dn->dccp_timeout[CT_DCCP_CLOSING] = 64 * HZ;
834 dn->dccp_timeout[CT_DCCP_TIMEWAIT] = 2 * DCCP_MSL;
836 /* timeouts[0] is unused, make it same as SYN_SENT so
837 * ->timeouts[0] contains 'new' timeout, like udp or icmp.
839 dn->dccp_timeout[CT_DCCP_NONE] = dn->dccp_timeout[CT_DCCP_REQUEST];
842 return dccp_kmemdup_sysctl_table(net, pn, dn);
845 static struct nf_proto_net *dccp_get_net_proto(struct net *net)
847 return &net->ct.nf_ct_proto.dccp.pn;
850 const struct nf_conntrack_l4proto nf_conntrack_l4proto_dccp4 = {
852 .l4proto = IPPROTO_DCCP,
854 .packet = dccp_packet,
856 .can_early_drop = dccp_can_early_drop,
857 #ifdef CONFIG_NF_CONNTRACK_PROCFS
858 .print_conntrack = dccp_print_conntrack,
860 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
861 .nlattr_size = DCCP_NLATTR_SIZE,
862 .to_nlattr = dccp_to_nlattr,
863 .from_nlattr = nlattr_to_dccp,
864 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
865 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
866 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
867 .nla_policy = nf_ct_port_nla_policy,
869 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
871 .nlattr_to_obj = dccp_timeout_nlattr_to_obj,
872 .obj_to_nlattr = dccp_timeout_obj_to_nlattr,
873 .nlattr_max = CTA_TIMEOUT_DCCP_MAX,
874 .obj_size = sizeof(unsigned int) * CT_DCCP_MAX,
875 .nla_policy = dccp_timeout_nla_policy,
877 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
878 .init_net = dccp_init_net,
879 .get_net_proto = dccp_get_net_proto,
881 EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_dccp4);
883 const struct nf_conntrack_l4proto nf_conntrack_l4proto_dccp6 = {
885 .l4proto = IPPROTO_DCCP,
887 .packet = dccp_packet,
889 .can_early_drop = dccp_can_early_drop,
890 #ifdef CONFIG_NF_CONNTRACK_PROCFS
891 .print_conntrack = dccp_print_conntrack,
893 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
894 .nlattr_size = DCCP_NLATTR_SIZE,
895 .to_nlattr = dccp_to_nlattr,
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 #ifdef CONFIG_NF_CONNTRACK_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_CONNTRACK_TIMEOUT */
911 .init_net = dccp_init_net,
912 .get_net_proto = dccp_get_net_proto,
914 EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_dccp6);