2 * Connection tracking protocol helper module for SCTP.
4 * Copyright (c) 2004 Kiran Kumar Immidi <immidi_kiran@yahoo.com>
5 * Copyright (c) 2004-2012 Patrick McHardy <kaber@trash.net>
7 * SCTP is defined in RFC 2960. References to various sections in this code
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/types.h>
16 #include <linux/timer.h>
17 #include <linux/netfilter.h>
20 #include <linux/sctp.h>
21 #include <linux/string.h>
22 #include <linux/seq_file.h>
23 #include <linux/spinlock.h>
24 #include <linux/interrupt.h>
25 #include <net/sctp/checksum.h>
27 #include <net/netfilter/nf_log.h>
28 #include <net/netfilter/nf_conntrack.h>
29 #include <net/netfilter/nf_conntrack_l4proto.h>
30 #include <net/netfilter/nf_conntrack_ecache.h>
32 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
33 closely. They're more complex. --RR
35 And so for me for SCTP :D -Kiran */
37 static const char *const sctp_conntrack_names
[] = {
51 #define MINS * 60 SECS
52 #define HOURS * 60 MINS
53 #define DAYS * 24 HOURS
55 static unsigned int sctp_timeouts
[SCTP_CONNTRACK_MAX
] __read_mostly
= {
56 [SCTP_CONNTRACK_CLOSED
] = 10 SECS
,
57 [SCTP_CONNTRACK_COOKIE_WAIT
] = 3 SECS
,
58 [SCTP_CONNTRACK_COOKIE_ECHOED
] = 3 SECS
,
59 [SCTP_CONNTRACK_ESTABLISHED
] = 5 DAYS
,
60 [SCTP_CONNTRACK_SHUTDOWN_SENT
] = 300 SECS
/ 1000,
61 [SCTP_CONNTRACK_SHUTDOWN_RECD
] = 300 SECS
/ 1000,
62 [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
] = 3 SECS
,
63 [SCTP_CONNTRACK_HEARTBEAT_SENT
] = 30 SECS
,
64 [SCTP_CONNTRACK_HEARTBEAT_ACKED
] = 210 SECS
,
67 #define sNO SCTP_CONNTRACK_NONE
68 #define sCL SCTP_CONNTRACK_CLOSED
69 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
70 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
71 #define sES SCTP_CONNTRACK_ESTABLISHED
72 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
73 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
74 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
75 #define sHS SCTP_CONNTRACK_HEARTBEAT_SENT
76 #define sHA SCTP_CONNTRACK_HEARTBEAT_ACKED
77 #define sIV SCTP_CONNTRACK_MAX
80 These are the descriptions of the states:
82 NOTE: These state names are tantalizingly similar to the states of an
83 SCTP endpoint. But the interpretation of the states is a little different,
84 considering that these are the states of the connection and not of an end
85 point. Please note the subtleties. -Kiran
87 NONE - Nothing so far.
88 COOKIE WAIT - We have seen an INIT chunk in the original direction, or also
89 an INIT_ACK chunk in the reply direction.
90 COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction.
91 ESTABLISHED - We have seen a COOKIE_ACK in the reply direction.
92 SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction.
93 SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin.
94 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
95 to that of the SHUTDOWN chunk.
96 CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
97 the SHUTDOWN chunk. Connection is closed.
98 HEARTBEAT_SENT - We have seen a HEARTBEAT in a new flow.
99 HEARTBEAT_ACKED - We have seen a HEARTBEAT-ACK in the direction opposite to
100 that of the HEARTBEAT chunk. Secondary connection is
105 - I have assumed that the first INIT is in the original direction.
106 This messes things when an INIT comes in the reply direction in CLOSED
108 - Check the error type in the reply dir before transitioning from
109 cookie echoed to closed.
110 - Sec 5.2.4 of RFC 2960
111 - Full Multi Homing support.
114 /* SCTP conntrack state transitions */
115 static const u8 sctp_conntracks
[2][11][SCTP_CONNTRACK_MAX
] = {
118 /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */
119 /* init */ {sCW
, sCW
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sCW
, sHA
},
120 /* init_ack */ {sCL
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sCL
, sHA
},
121 /* abort */ {sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
},
122 /* shutdown */ {sCL
, sCL
, sCW
, sCE
, sSS
, sSS
, sSR
, sSA
, sCL
, sSS
},
123 /* shutdown_ack */ {sSA
, sCL
, sCW
, sCE
, sES
, sSA
, sSA
, sSA
, sSA
, sHA
},
124 /* error */ {sCL
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sCL
, sHA
},/* Can't have Stale cookie*/
125 /* cookie_echo */ {sCL
, sCL
, sCE
, sCE
, sES
, sSS
, sSR
, sSA
, sCL
, sHA
},/* 5.2.4 - Big TODO */
126 /* cookie_ack */ {sCL
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sCL
, sHA
},/* Can't come in orig dir */
127 /* shutdown_comp*/ {sCL
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sCL
, sCL
, sHA
},
128 /* heartbeat */ {sHS
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sHS
, sHA
},
129 /* heartbeat_ack*/ {sCL
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sHS
, sHA
}
133 /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */
134 /* init */ {sIV
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sIV
, sHA
},/* INIT in sCL Big TODO */
135 /* init_ack */ {sIV
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sIV
, sHA
},
136 /* abort */ {sIV
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sIV
, sCL
},
137 /* shutdown */ {sIV
, sCL
, sCW
, sCE
, sSR
, sSS
, sSR
, sSA
, sIV
, sSR
},
138 /* shutdown_ack */ {sIV
, sCL
, sCW
, sCE
, sES
, sSA
, sSA
, sSA
, sIV
, sHA
},
139 /* error */ {sIV
, sCL
, sCW
, sCL
, sES
, sSS
, sSR
, sSA
, sIV
, sHA
},
140 /* cookie_echo */ {sIV
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sIV
, sHA
},/* Can't come in reply dir */
141 /* cookie_ack */ {sIV
, sCL
, sCW
, sES
, sES
, sSS
, sSR
, sSA
, sIV
, sHA
},
142 /* shutdown_comp*/ {sIV
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sCL
, sIV
, sHA
},
143 /* heartbeat */ {sIV
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sHS
, sHA
},
144 /* heartbeat_ack*/ {sIV
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sHA
, sHA
}
148 static inline struct nf_sctp_net
*sctp_pernet(struct net
*net
)
150 return &net
->ct
.nf_ct_proto
.sctp
;
153 static bool sctp_pkt_to_tuple(const struct sk_buff
*skb
, unsigned int dataoff
,
154 struct net
*net
, struct nf_conntrack_tuple
*tuple
)
156 const struct sctphdr
*hp
;
159 /* Actually only need first 4 bytes to get ports. */
160 hp
= skb_header_pointer(skb
, dataoff
, 4, &_hdr
);
164 tuple
->src
.u
.sctp
.port
= hp
->source
;
165 tuple
->dst
.u
.sctp
.port
= hp
->dest
;
169 static bool sctp_invert_tuple(struct nf_conntrack_tuple
*tuple
,
170 const struct nf_conntrack_tuple
*orig
)
172 tuple
->src
.u
.sctp
.port
= orig
->dst
.u
.sctp
.port
;
173 tuple
->dst
.u
.sctp
.port
= orig
->src
.u
.sctp
.port
;
177 #ifdef CONFIG_NF_CONNTRACK_PROCFS
178 /* Print out the private part of the conntrack. */
179 static void sctp_print_conntrack(struct seq_file
*s
, struct nf_conn
*ct
)
181 seq_printf(s
, "%s ", sctp_conntrack_names
[ct
->proto
.sctp
.state
]);
185 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \
186 for ((offset) = (dataoff) + sizeof(struct sctphdr), (count) = 0; \
187 (offset) < (skb)->len && \
188 ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \
189 (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
191 /* Some validity checks to make sure the chunks are fine */
192 static int do_basic_checks(struct nf_conn
*ct
,
193 const struct sk_buff
*skb
,
194 unsigned int dataoff
,
197 u_int32_t offset
, count
;
198 struct sctp_chunkhdr _sch
, *sch
;
203 for_each_sctp_chunk (skb
, sch
, _sch
, offset
, dataoff
, count
) {
204 pr_debug("Chunk Num: %d Type: %d\n", count
, sch
->type
);
206 if (sch
->type
== SCTP_CID_INIT
||
207 sch
->type
== SCTP_CID_INIT_ACK
||
208 sch
->type
== SCTP_CID_SHUTDOWN_COMPLETE
)
212 * Cookie Ack/Echo chunks not the first OR
213 * Init / Init Ack / Shutdown compl chunks not the only chunks
216 if (((sch
->type
== SCTP_CID_COOKIE_ACK
||
217 sch
->type
== SCTP_CID_COOKIE_ECHO
||
219 count
!= 0) || !sch
->length
) {
220 pr_debug("Basic checks failed\n");
225 set_bit(sch
->type
, map
);
228 pr_debug("Basic checks passed\n");
232 static int sctp_new_state(enum ip_conntrack_dir dir
,
233 enum sctp_conntrack cur_state
,
238 pr_debug("Chunk type: %d\n", chunk_type
);
240 switch (chunk_type
) {
242 pr_debug("SCTP_CID_INIT\n");
245 case SCTP_CID_INIT_ACK
:
246 pr_debug("SCTP_CID_INIT_ACK\n");
250 pr_debug("SCTP_CID_ABORT\n");
253 case SCTP_CID_SHUTDOWN
:
254 pr_debug("SCTP_CID_SHUTDOWN\n");
257 case SCTP_CID_SHUTDOWN_ACK
:
258 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
262 pr_debug("SCTP_CID_ERROR\n");
265 case SCTP_CID_COOKIE_ECHO
:
266 pr_debug("SCTP_CID_COOKIE_ECHO\n");
269 case SCTP_CID_COOKIE_ACK
:
270 pr_debug("SCTP_CID_COOKIE_ACK\n");
273 case SCTP_CID_SHUTDOWN_COMPLETE
:
274 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
277 case SCTP_CID_HEARTBEAT
:
278 pr_debug("SCTP_CID_HEARTBEAT");
281 case SCTP_CID_HEARTBEAT_ACK
:
282 pr_debug("SCTP_CID_HEARTBEAT_ACK");
286 /* Other chunks like DATA or SACK do not change the state */
287 pr_debug("Unknown chunk type, Will stay in %s\n",
288 sctp_conntrack_names
[cur_state
]);
292 pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n",
293 dir
, sctp_conntrack_names
[cur_state
], chunk_type
,
294 sctp_conntrack_names
[sctp_conntracks
[dir
][i
][cur_state
]]);
296 return sctp_conntracks
[dir
][i
][cur_state
];
299 static unsigned int *sctp_get_timeouts(struct net
*net
)
301 return sctp_pernet(net
)->timeouts
;
304 /* Returns verdict for packet, or -NF_ACCEPT for invalid. */
305 static int sctp_packet(struct nf_conn
*ct
,
306 const struct sk_buff
*skb
,
307 unsigned int dataoff
,
308 enum ip_conntrack_info ctinfo
,
309 unsigned int *timeouts
)
311 enum sctp_conntrack new_state
, old_state
;
312 enum ip_conntrack_dir dir
= CTINFO2DIR(ctinfo
);
313 const struct sctphdr
*sh
;
314 struct sctphdr _sctph
;
315 const struct sctp_chunkhdr
*sch
;
316 struct sctp_chunkhdr _sch
;
317 u_int32_t offset
, count
;
318 unsigned long map
[256 / sizeof(unsigned long)] = { 0 };
320 sh
= skb_header_pointer(skb
, dataoff
, sizeof(_sctph
), &_sctph
);
324 if (do_basic_checks(ct
, skb
, dataoff
, map
) != 0)
327 /* Check the verification tag (Sec 8.5) */
328 if (!test_bit(SCTP_CID_INIT
, map
) &&
329 !test_bit(SCTP_CID_SHUTDOWN_COMPLETE
, map
) &&
330 !test_bit(SCTP_CID_COOKIE_ECHO
, map
) &&
331 !test_bit(SCTP_CID_ABORT
, map
) &&
332 !test_bit(SCTP_CID_SHUTDOWN_ACK
, map
) &&
333 !test_bit(SCTP_CID_HEARTBEAT
, map
) &&
334 !test_bit(SCTP_CID_HEARTBEAT_ACK
, map
) &&
335 sh
->vtag
!= ct
->proto
.sctp
.vtag
[dir
]) {
336 pr_debug("Verification tag check failed\n");
340 old_state
= new_state
= SCTP_CONNTRACK_NONE
;
341 spin_lock_bh(&ct
->lock
);
342 for_each_sctp_chunk (skb
, sch
, _sch
, offset
, dataoff
, count
) {
343 /* Special cases of Verification tag check (Sec 8.5.1) */
344 if (sch
->type
== SCTP_CID_INIT
) {
348 } else if (sch
->type
== SCTP_CID_ABORT
) {
350 if (sh
->vtag
!= ct
->proto
.sctp
.vtag
[dir
] &&
351 sh
->vtag
!= ct
->proto
.sctp
.vtag
[!dir
])
353 } else if (sch
->type
== SCTP_CID_SHUTDOWN_COMPLETE
) {
355 if (sh
->vtag
!= ct
->proto
.sctp
.vtag
[dir
] &&
356 sh
->vtag
!= ct
->proto
.sctp
.vtag
[!dir
] &&
357 sch
->flags
& SCTP_CHUNK_FLAG_T
)
359 } else if (sch
->type
== SCTP_CID_COOKIE_ECHO
) {
361 if (sh
->vtag
!= ct
->proto
.sctp
.vtag
[dir
])
363 } else if (sch
->type
== SCTP_CID_HEARTBEAT
||
364 sch
->type
== SCTP_CID_HEARTBEAT_ACK
) {
365 if (ct
->proto
.sctp
.vtag
[dir
] == 0) {
366 pr_debug("Setting vtag %x for dir %d\n",
368 ct
->proto
.sctp
.vtag
[dir
] = sh
->vtag
;
369 } else if (sh
->vtag
!= ct
->proto
.sctp
.vtag
[dir
]) {
370 pr_debug("Verification tag check failed\n");
375 old_state
= ct
->proto
.sctp
.state
;
376 new_state
= sctp_new_state(dir
, old_state
, sch
->type
);
379 if (new_state
== SCTP_CONNTRACK_MAX
) {
380 pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
382 dir
, sch
->type
, old_state
);
386 /* If it is an INIT or an INIT ACK note down the vtag */
387 if (sch
->type
== SCTP_CID_INIT
||
388 sch
->type
== SCTP_CID_INIT_ACK
) {
389 struct sctp_inithdr _inithdr
, *ih
;
391 ih
= skb_header_pointer(skb
, offset
+ sizeof(_sch
),
392 sizeof(_inithdr
), &_inithdr
);
395 pr_debug("Setting vtag %x for dir %d\n",
397 ct
->proto
.sctp
.vtag
[!dir
] = ih
->init_tag
;
400 ct
->proto
.sctp
.state
= new_state
;
401 if (old_state
!= new_state
)
402 nf_conntrack_event_cache(IPCT_PROTOINFO
, ct
);
404 spin_unlock_bh(&ct
->lock
);
406 nf_ct_refresh_acct(ct
, ctinfo
, skb
, timeouts
[new_state
]);
408 if (old_state
== SCTP_CONNTRACK_COOKIE_ECHOED
&&
409 dir
== IP_CT_DIR_REPLY
&&
410 new_state
== SCTP_CONNTRACK_ESTABLISHED
) {
411 pr_debug("Setting assured bit\n");
412 set_bit(IPS_ASSURED_BIT
, &ct
->status
);
413 nf_conntrack_event_cache(IPCT_ASSURED
, ct
);
419 spin_unlock_bh(&ct
->lock
);
424 /* Called when a new connection for this protocol found. */
425 static bool sctp_new(struct nf_conn
*ct
, const struct sk_buff
*skb
,
426 unsigned int dataoff
, unsigned int *timeouts
)
428 enum sctp_conntrack new_state
;
429 const struct sctphdr
*sh
;
430 struct sctphdr _sctph
;
431 const struct sctp_chunkhdr
*sch
;
432 struct sctp_chunkhdr _sch
;
433 u_int32_t offset
, count
;
434 unsigned long map
[256 / sizeof(unsigned long)] = { 0 };
436 sh
= skb_header_pointer(skb
, dataoff
, sizeof(_sctph
), &_sctph
);
440 if (do_basic_checks(ct
, skb
, dataoff
, map
) != 0)
443 /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
444 if (test_bit(SCTP_CID_ABORT
, map
) ||
445 test_bit(SCTP_CID_SHUTDOWN_COMPLETE
, map
) ||
446 test_bit(SCTP_CID_COOKIE_ACK
, map
))
449 memset(&ct
->proto
.sctp
, 0, sizeof(ct
->proto
.sctp
));
450 new_state
= SCTP_CONNTRACK_MAX
;
451 for_each_sctp_chunk (skb
, sch
, _sch
, offset
, dataoff
, count
) {
452 /* Don't need lock here: this conntrack not in circulation yet */
453 new_state
= sctp_new_state(IP_CT_DIR_ORIGINAL
,
454 SCTP_CONNTRACK_NONE
, sch
->type
);
456 /* Invalid: delete conntrack */
457 if (new_state
== SCTP_CONNTRACK_NONE
||
458 new_state
== SCTP_CONNTRACK_MAX
) {
459 pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
463 /* Copy the vtag into the state info */
464 if (sch
->type
== SCTP_CID_INIT
) {
465 struct sctp_inithdr _inithdr
, *ih
;
470 ih
= skb_header_pointer(skb
, offset
+ sizeof(_sch
),
471 sizeof(_inithdr
), &_inithdr
);
475 pr_debug("Setting vtag %x for new conn\n",
478 ct
->proto
.sctp
.vtag
[IP_CT_DIR_REPLY
] = ih
->init_tag
;
479 } else if (sch
->type
== SCTP_CID_HEARTBEAT
) {
480 pr_debug("Setting vtag %x for secondary conntrack\n",
482 ct
->proto
.sctp
.vtag
[IP_CT_DIR_ORIGINAL
] = sh
->vtag
;
484 /* If it is a shutdown ack OOTB packet, we expect a return
485 shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
487 pr_debug("Setting vtag %x for new conn OOTB\n",
489 ct
->proto
.sctp
.vtag
[IP_CT_DIR_REPLY
] = sh
->vtag
;
492 ct
->proto
.sctp
.state
= new_state
;
498 static int sctp_error(struct net
*net
, struct nf_conn
*tpl
, struct sk_buff
*skb
,
499 unsigned int dataoff
,
500 u8 pf
, unsigned int hooknum
)
502 const struct sctphdr
*sh
;
505 if (skb
->len
< dataoff
+ sizeof(struct sctphdr
)) {
506 logmsg
= "nf_ct_sctp: short packet ";
509 if (net
->ct
.sysctl_checksum
&& hooknum
== NF_INET_PRE_ROUTING
&&
510 skb
->ip_summed
== CHECKSUM_NONE
) {
511 if (!skb_make_writable(skb
, dataoff
+ sizeof(struct sctphdr
))) {
512 logmsg
= "nf_ct_sctp: failed to read header ";
515 sh
= (const struct sctphdr
*)(skb
->data
+ dataoff
);
516 if (sh
->checksum
!= sctp_compute_cksum(skb
, dataoff
)) {
517 logmsg
= "nf_ct_sctp: bad CRC ";
520 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
524 nf_l4proto_log_invalid(skb
, net
, pf
, IPPROTO_SCTP
, "%s", logmsg
);
528 static bool sctp_can_early_drop(const struct nf_conn
*ct
)
530 switch (ct
->proto
.sctp
.state
) {
531 case SCTP_CONNTRACK_SHUTDOWN_SENT
:
532 case SCTP_CONNTRACK_SHUTDOWN_RECD
:
533 case SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
:
542 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
544 #include <linux/netfilter/nfnetlink.h>
545 #include <linux/netfilter/nfnetlink_conntrack.h>
547 static int sctp_to_nlattr(struct sk_buff
*skb
, struct nlattr
*nla
,
550 struct nlattr
*nest_parms
;
552 spin_lock_bh(&ct
->lock
);
553 nest_parms
= nla_nest_start(skb
, CTA_PROTOINFO_SCTP
| NLA_F_NESTED
);
555 goto nla_put_failure
;
557 if (nla_put_u8(skb
, CTA_PROTOINFO_SCTP_STATE
, ct
->proto
.sctp
.state
) ||
558 nla_put_be32(skb
, CTA_PROTOINFO_SCTP_VTAG_ORIGINAL
,
559 ct
->proto
.sctp
.vtag
[IP_CT_DIR_ORIGINAL
]) ||
560 nla_put_be32(skb
, CTA_PROTOINFO_SCTP_VTAG_REPLY
,
561 ct
->proto
.sctp
.vtag
[IP_CT_DIR_REPLY
]))
562 goto nla_put_failure
;
564 spin_unlock_bh(&ct
->lock
);
566 nla_nest_end(skb
, nest_parms
);
571 spin_unlock_bh(&ct
->lock
);
575 static const struct nla_policy sctp_nla_policy
[CTA_PROTOINFO_SCTP_MAX
+1] = {
576 [CTA_PROTOINFO_SCTP_STATE
] = { .type
= NLA_U8
},
577 [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL
] = { .type
= NLA_U32
},
578 [CTA_PROTOINFO_SCTP_VTAG_REPLY
] = { .type
= NLA_U32
},
581 static int nlattr_to_sctp(struct nlattr
*cda
[], struct nf_conn
*ct
)
583 struct nlattr
*attr
= cda
[CTA_PROTOINFO_SCTP
];
584 struct nlattr
*tb
[CTA_PROTOINFO_SCTP_MAX
+1];
587 /* updates may not contain the internal protocol info, skip parsing */
591 err
= nla_parse_nested(tb
, CTA_PROTOINFO_SCTP_MAX
, attr
,
592 sctp_nla_policy
, NULL
);
596 if (!tb
[CTA_PROTOINFO_SCTP_STATE
] ||
597 !tb
[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL
] ||
598 !tb
[CTA_PROTOINFO_SCTP_VTAG_REPLY
])
601 spin_lock_bh(&ct
->lock
);
602 ct
->proto
.sctp
.state
= nla_get_u8(tb
[CTA_PROTOINFO_SCTP_STATE
]);
603 ct
->proto
.sctp
.vtag
[IP_CT_DIR_ORIGINAL
] =
604 nla_get_be32(tb
[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL
]);
605 ct
->proto
.sctp
.vtag
[IP_CT_DIR_REPLY
] =
606 nla_get_be32(tb
[CTA_PROTOINFO_SCTP_VTAG_REPLY
]);
607 spin_unlock_bh(&ct
->lock
);
612 static int sctp_nlattr_size(void)
614 return nla_total_size(0) /* CTA_PROTOINFO_SCTP */
615 + nla_policy_len(sctp_nla_policy
, CTA_PROTOINFO_SCTP_MAX
+ 1);
619 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
621 #include <linux/netfilter/nfnetlink.h>
622 #include <linux/netfilter/nfnetlink_cttimeout.h>
624 static int sctp_timeout_nlattr_to_obj(struct nlattr
*tb
[],
625 struct net
*net
, void *data
)
627 unsigned int *timeouts
= data
;
628 struct nf_sctp_net
*sn
= sctp_pernet(net
);
631 /* set default SCTP timeouts. */
632 for (i
=0; i
<SCTP_CONNTRACK_MAX
; i
++)
633 timeouts
[i
] = sn
->timeouts
[i
];
635 /* there's a 1:1 mapping between attributes and protocol states. */
636 for (i
=CTA_TIMEOUT_SCTP_UNSPEC
+1; i
<CTA_TIMEOUT_SCTP_MAX
+1; i
++) {
638 timeouts
[i
] = ntohl(nla_get_be32(tb
[i
])) * HZ
;
645 sctp_timeout_obj_to_nlattr(struct sk_buff
*skb
, const void *data
)
647 const unsigned int *timeouts
= data
;
650 for (i
=CTA_TIMEOUT_SCTP_UNSPEC
+1; i
<CTA_TIMEOUT_SCTP_MAX
+1; i
++) {
651 if (nla_put_be32(skb
, i
, htonl(timeouts
[i
] / HZ
)))
652 goto nla_put_failure
;
660 static const struct nla_policy
661 sctp_timeout_nla_policy
[CTA_TIMEOUT_SCTP_MAX
+1] = {
662 [CTA_TIMEOUT_SCTP_CLOSED
] = { .type
= NLA_U32
},
663 [CTA_TIMEOUT_SCTP_COOKIE_WAIT
] = { .type
= NLA_U32
},
664 [CTA_TIMEOUT_SCTP_COOKIE_ECHOED
] = { .type
= NLA_U32
},
665 [CTA_TIMEOUT_SCTP_ESTABLISHED
] = { .type
= NLA_U32
},
666 [CTA_TIMEOUT_SCTP_SHUTDOWN_SENT
] = { .type
= NLA_U32
},
667 [CTA_TIMEOUT_SCTP_SHUTDOWN_RECD
] = { .type
= NLA_U32
},
668 [CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT
] = { .type
= NLA_U32
},
669 [CTA_TIMEOUT_SCTP_HEARTBEAT_SENT
] = { .type
= NLA_U32
},
670 [CTA_TIMEOUT_SCTP_HEARTBEAT_ACKED
] = { .type
= NLA_U32
},
672 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
676 static struct ctl_table sctp_sysctl_table
[] = {
678 .procname
= "nf_conntrack_sctp_timeout_closed",
679 .maxlen
= sizeof(unsigned int),
681 .proc_handler
= proc_dointvec_jiffies
,
684 .procname
= "nf_conntrack_sctp_timeout_cookie_wait",
685 .maxlen
= sizeof(unsigned int),
687 .proc_handler
= proc_dointvec_jiffies
,
690 .procname
= "nf_conntrack_sctp_timeout_cookie_echoed",
691 .maxlen
= sizeof(unsigned int),
693 .proc_handler
= proc_dointvec_jiffies
,
696 .procname
= "nf_conntrack_sctp_timeout_established",
697 .maxlen
= sizeof(unsigned int),
699 .proc_handler
= proc_dointvec_jiffies
,
702 .procname
= "nf_conntrack_sctp_timeout_shutdown_sent",
703 .maxlen
= sizeof(unsigned int),
705 .proc_handler
= proc_dointvec_jiffies
,
708 .procname
= "nf_conntrack_sctp_timeout_shutdown_recd",
709 .maxlen
= sizeof(unsigned int),
711 .proc_handler
= proc_dointvec_jiffies
,
714 .procname
= "nf_conntrack_sctp_timeout_shutdown_ack_sent",
715 .maxlen
= sizeof(unsigned int),
717 .proc_handler
= proc_dointvec_jiffies
,
720 .procname
= "nf_conntrack_sctp_timeout_heartbeat_sent",
721 .maxlen
= sizeof(unsigned int),
723 .proc_handler
= proc_dointvec_jiffies
,
726 .procname
= "nf_conntrack_sctp_timeout_heartbeat_acked",
727 .maxlen
= sizeof(unsigned int),
729 .proc_handler
= proc_dointvec_jiffies
,
735 static int sctp_kmemdup_sysctl_table(struct nf_proto_net
*pn
,
736 struct nf_sctp_net
*sn
)
742 pn
->ctl_table
= kmemdup(sctp_sysctl_table
,
743 sizeof(sctp_sysctl_table
),
748 pn
->ctl_table
[0].data
= &sn
->timeouts
[SCTP_CONNTRACK_CLOSED
];
749 pn
->ctl_table
[1].data
= &sn
->timeouts
[SCTP_CONNTRACK_COOKIE_WAIT
];
750 pn
->ctl_table
[2].data
= &sn
->timeouts
[SCTP_CONNTRACK_COOKIE_ECHOED
];
751 pn
->ctl_table
[3].data
= &sn
->timeouts
[SCTP_CONNTRACK_ESTABLISHED
];
752 pn
->ctl_table
[4].data
= &sn
->timeouts
[SCTP_CONNTRACK_SHUTDOWN_SENT
];
753 pn
->ctl_table
[5].data
= &sn
->timeouts
[SCTP_CONNTRACK_SHUTDOWN_RECD
];
754 pn
->ctl_table
[6].data
= &sn
->timeouts
[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
];
755 pn
->ctl_table
[7].data
= &sn
->timeouts
[SCTP_CONNTRACK_HEARTBEAT_SENT
];
756 pn
->ctl_table
[8].data
= &sn
->timeouts
[SCTP_CONNTRACK_HEARTBEAT_ACKED
];
761 static int sctp_init_net(struct net
*net
, u_int16_t proto
)
763 struct nf_sctp_net
*sn
= sctp_pernet(net
);
764 struct nf_proto_net
*pn
= &sn
->pn
;
769 for (i
= 0; i
< SCTP_CONNTRACK_MAX
; i
++)
770 sn
->timeouts
[i
] = sctp_timeouts
[i
];
773 return sctp_kmemdup_sysctl_table(pn
, sn
);
776 static struct nf_proto_net
*sctp_get_net_proto(struct net
*net
)
778 return &net
->ct
.nf_ct_proto
.sctp
.pn
;
781 struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly
= {
783 .l4proto
= IPPROTO_SCTP
,
784 .pkt_to_tuple
= sctp_pkt_to_tuple
,
785 .invert_tuple
= sctp_invert_tuple
,
786 #ifdef CONFIG_NF_CONNTRACK_PROCFS
787 .print_conntrack
= sctp_print_conntrack
,
789 .packet
= sctp_packet
,
790 .get_timeouts
= sctp_get_timeouts
,
793 .can_early_drop
= sctp_can_early_drop
,
795 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
796 .to_nlattr
= sctp_to_nlattr
,
797 .nlattr_size
= sctp_nlattr_size
,
798 .from_nlattr
= nlattr_to_sctp
,
799 .tuple_to_nlattr
= nf_ct_port_tuple_to_nlattr
,
800 .nlattr_tuple_size
= nf_ct_port_nlattr_tuple_size
,
801 .nlattr_to_tuple
= nf_ct_port_nlattr_to_tuple
,
802 .nla_policy
= nf_ct_port_nla_policy
,
804 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
806 .nlattr_to_obj
= sctp_timeout_nlattr_to_obj
,
807 .obj_to_nlattr
= sctp_timeout_obj_to_nlattr
,
808 .nlattr_max
= CTA_TIMEOUT_SCTP_MAX
,
809 .obj_size
= sizeof(unsigned int) * SCTP_CONNTRACK_MAX
,
810 .nla_policy
= sctp_timeout_nla_policy
,
812 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
813 .init_net
= sctp_init_net
,
814 .get_net_proto
= sctp_get_net_proto
,
816 EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_sctp4
);
818 struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly
= {
820 .l4proto
= IPPROTO_SCTP
,
821 .pkt_to_tuple
= sctp_pkt_to_tuple
,
822 .invert_tuple
= sctp_invert_tuple
,
823 #ifdef CONFIG_NF_CONNTRACK_PROCFS
824 .print_conntrack
= sctp_print_conntrack
,
826 .packet
= sctp_packet
,
827 .get_timeouts
= sctp_get_timeouts
,
830 .can_early_drop
= sctp_can_early_drop
,
832 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
833 .to_nlattr
= sctp_to_nlattr
,
834 .nlattr_size
= sctp_nlattr_size
,
835 .from_nlattr
= nlattr_to_sctp
,
836 .tuple_to_nlattr
= nf_ct_port_tuple_to_nlattr
,
837 .nlattr_tuple_size
= nf_ct_port_nlattr_tuple_size
,
838 .nlattr_to_tuple
= nf_ct_port_nlattr_to_tuple
,
839 .nla_policy
= nf_ct_port_nla_policy
,
840 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
842 .nlattr_to_obj
= sctp_timeout_nlattr_to_obj
,
843 .obj_to_nlattr
= sctp_timeout_obj_to_nlattr
,
844 .nlattr_max
= CTA_TIMEOUT_SCTP_MAX
,
845 .obj_size
= sizeof(unsigned int) * SCTP_CONNTRACK_MAX
,
846 .nla_policy
= sctp_timeout_nla_policy
,
848 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
850 .init_net
= sctp_init_net
,
851 .get_net_proto
= sctp_get_net_proto
,
853 EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_sctp6
);