1 // SPDX-License-Identifier: GPL-2.0-only
3 * Connection tracking protocol helper module for SCTP.
5 * Copyright (c) 2004 Kiran Kumar Immidi <immidi_kiran@yahoo.com>
6 * Copyright (c) 2004-2012 Patrick McHardy <kaber@trash.net>
8 * SCTP is defined in RFC 2960. References to various sections in this code
12 #include <linux/types.h>
13 #include <linux/timer.h>
14 #include <linux/netfilter.h>
17 #include <linux/sctp.h>
18 #include <linux/string.h>
19 #include <linux/seq_file.h>
20 #include <linux/spinlock.h>
21 #include <linux/interrupt.h>
22 #include <net/sctp/checksum.h>
24 #include <net/netfilter/nf_log.h>
25 #include <net/netfilter/nf_conntrack.h>
26 #include <net/netfilter/nf_conntrack_l4proto.h>
27 #include <net/netfilter/nf_conntrack_ecache.h>
28 #include <net/netfilter/nf_conntrack_timeout.h>
30 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
31 closely. They're more complex. --RR
33 And so for me for SCTP :D -Kiran */
35 static const char *const sctp_conntrack_names
[] = {
49 #define MINS * 60 SECS
50 #define HOURS * 60 MINS
51 #define DAYS * 24 HOURS
53 static const unsigned int sctp_timeouts
[SCTP_CONNTRACK_MAX
] = {
54 [SCTP_CONNTRACK_CLOSED
] = 10 SECS
,
55 [SCTP_CONNTRACK_COOKIE_WAIT
] = 3 SECS
,
56 [SCTP_CONNTRACK_COOKIE_ECHOED
] = 3 SECS
,
57 [SCTP_CONNTRACK_ESTABLISHED
] = 5 DAYS
,
58 [SCTP_CONNTRACK_SHUTDOWN_SENT
] = 300 SECS
/ 1000,
59 [SCTP_CONNTRACK_SHUTDOWN_RECD
] = 300 SECS
/ 1000,
60 [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
] = 3 SECS
,
61 [SCTP_CONNTRACK_HEARTBEAT_SENT
] = 30 SECS
,
62 [SCTP_CONNTRACK_HEARTBEAT_ACKED
] = 210 SECS
,
65 #define SCTP_FLAG_HEARTBEAT_VTAG_FAILED 1
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 */ {sCL
, sCL
, 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
, sCW
, 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 #ifdef CONFIG_NF_CONNTRACK_PROCFS
149 /* Print out the private part of the conntrack. */
150 static void sctp_print_conntrack(struct seq_file
*s
, struct nf_conn
*ct
)
152 seq_printf(s
, "%s ", sctp_conntrack_names
[ct
->proto
.sctp
.state
]);
156 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \
157 for ((offset) = (dataoff) + sizeof(struct sctphdr), (count) = 0; \
158 (offset) < (skb)->len && \
159 ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \
160 (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
162 /* Some validity checks to make sure the chunks are fine */
163 static int do_basic_checks(struct nf_conn
*ct
,
164 const struct sk_buff
*skb
,
165 unsigned int dataoff
,
168 u_int32_t offset
, count
;
169 struct sctp_chunkhdr _sch
, *sch
;
174 for_each_sctp_chunk (skb
, sch
, _sch
, offset
, dataoff
, count
) {
175 pr_debug("Chunk Num: %d Type: %d\n", count
, sch
->type
);
177 if (sch
->type
== SCTP_CID_INIT
||
178 sch
->type
== SCTP_CID_INIT_ACK
||
179 sch
->type
== SCTP_CID_SHUTDOWN_COMPLETE
)
183 * Cookie Ack/Echo chunks not the first OR
184 * Init / Init Ack / Shutdown compl chunks not the only chunks
187 if (((sch
->type
== SCTP_CID_COOKIE_ACK
||
188 sch
->type
== SCTP_CID_COOKIE_ECHO
||
190 count
!= 0) || !sch
->length
) {
191 pr_debug("Basic checks failed\n");
196 set_bit(sch
->type
, map
);
199 pr_debug("Basic checks passed\n");
203 static int sctp_new_state(enum ip_conntrack_dir dir
,
204 enum sctp_conntrack cur_state
,
209 pr_debug("Chunk type: %d\n", chunk_type
);
211 switch (chunk_type
) {
213 pr_debug("SCTP_CID_INIT\n");
216 case SCTP_CID_INIT_ACK
:
217 pr_debug("SCTP_CID_INIT_ACK\n");
221 pr_debug("SCTP_CID_ABORT\n");
224 case SCTP_CID_SHUTDOWN
:
225 pr_debug("SCTP_CID_SHUTDOWN\n");
228 case SCTP_CID_SHUTDOWN_ACK
:
229 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
233 pr_debug("SCTP_CID_ERROR\n");
236 case SCTP_CID_COOKIE_ECHO
:
237 pr_debug("SCTP_CID_COOKIE_ECHO\n");
240 case SCTP_CID_COOKIE_ACK
:
241 pr_debug("SCTP_CID_COOKIE_ACK\n");
244 case SCTP_CID_SHUTDOWN_COMPLETE
:
245 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
248 case SCTP_CID_HEARTBEAT
:
249 pr_debug("SCTP_CID_HEARTBEAT");
252 case SCTP_CID_HEARTBEAT_ACK
:
253 pr_debug("SCTP_CID_HEARTBEAT_ACK");
257 /* Other chunks like DATA or SACK do not change the state */
258 pr_debug("Unknown chunk type, Will stay in %s\n",
259 sctp_conntrack_names
[cur_state
]);
263 pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n",
264 dir
, sctp_conntrack_names
[cur_state
], chunk_type
,
265 sctp_conntrack_names
[sctp_conntracks
[dir
][i
][cur_state
]]);
267 return sctp_conntracks
[dir
][i
][cur_state
];
270 /* Don't need lock here: this conntrack not in circulation yet */
272 sctp_new(struct nf_conn
*ct
, const struct sk_buff
*skb
,
273 const struct sctphdr
*sh
, unsigned int dataoff
)
275 enum sctp_conntrack new_state
;
276 const struct sctp_chunkhdr
*sch
;
277 struct sctp_chunkhdr _sch
;
280 memset(&ct
->proto
.sctp
, 0, sizeof(ct
->proto
.sctp
));
281 new_state
= SCTP_CONNTRACK_MAX
;
282 for_each_sctp_chunk(skb
, sch
, _sch
, offset
, dataoff
, count
) {
283 new_state
= sctp_new_state(IP_CT_DIR_ORIGINAL
,
284 SCTP_CONNTRACK_NONE
, sch
->type
);
286 /* Invalid: delete conntrack */
287 if (new_state
== SCTP_CONNTRACK_NONE
||
288 new_state
== SCTP_CONNTRACK_MAX
) {
289 pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
293 /* Copy the vtag into the state info */
294 if (sch
->type
== SCTP_CID_INIT
) {
295 struct sctp_inithdr _inithdr
, *ih
;
300 ih
= skb_header_pointer(skb
, offset
+ sizeof(_sch
),
301 sizeof(_inithdr
), &_inithdr
);
305 pr_debug("Setting vtag %x for new conn\n",
308 ct
->proto
.sctp
.vtag
[IP_CT_DIR_REPLY
] = ih
->init_tag
;
309 } else if (sch
->type
== SCTP_CID_HEARTBEAT
) {
310 pr_debug("Setting vtag %x for secondary conntrack\n",
312 ct
->proto
.sctp
.vtag
[IP_CT_DIR_ORIGINAL
] = sh
->vtag
;
314 /* If it is a shutdown ack OOTB packet, we expect a return
315 shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
316 pr_debug("Setting vtag %x for new conn OOTB\n",
318 ct
->proto
.sctp
.vtag
[IP_CT_DIR_REPLY
] = sh
->vtag
;
321 ct
->proto
.sctp
.state
= SCTP_CONNTRACK_NONE
;
327 static bool sctp_error(struct sk_buff
*skb
,
328 unsigned int dataoff
,
329 const struct nf_hook_state
*state
)
331 const struct sctphdr
*sh
;
334 if (skb
->len
< dataoff
+ sizeof(struct sctphdr
)) {
335 logmsg
= "nf_ct_sctp: short packet ";
338 if (state
->hook
== NF_INET_PRE_ROUTING
&&
339 state
->net
->ct
.sysctl_checksum
&&
340 skb
->ip_summed
== CHECKSUM_NONE
) {
341 if (skb_ensure_writable(skb
, dataoff
+ sizeof(*sh
))) {
342 logmsg
= "nf_ct_sctp: failed to read header ";
345 sh
= (const struct sctphdr
*)(skb
->data
+ dataoff
);
346 if (sh
->checksum
!= sctp_compute_cksum(skb
, dataoff
)) {
347 logmsg
= "nf_ct_sctp: bad CRC ";
350 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
354 nf_l4proto_log_invalid(skb
, state
->net
, state
->pf
, IPPROTO_SCTP
, "%s", logmsg
);
358 /* Returns verdict for packet, or -NF_ACCEPT for invalid. */
359 int nf_conntrack_sctp_packet(struct nf_conn
*ct
,
361 unsigned int dataoff
,
362 enum ip_conntrack_info ctinfo
,
363 const struct nf_hook_state
*state
)
365 enum sctp_conntrack new_state
, old_state
;
366 enum ip_conntrack_dir dir
= CTINFO2DIR(ctinfo
);
367 const struct sctphdr
*sh
;
368 struct sctphdr _sctph
;
369 const struct sctp_chunkhdr
*sch
;
370 struct sctp_chunkhdr _sch
;
371 u_int32_t offset
, count
;
372 unsigned int *timeouts
;
373 unsigned long map
[256 / sizeof(unsigned long)] = { 0 };
376 if (sctp_error(skb
, dataoff
, state
))
379 sh
= skb_header_pointer(skb
, dataoff
, sizeof(_sctph
), &_sctph
);
383 if (do_basic_checks(ct
, skb
, dataoff
, map
) != 0)
386 if (!nf_ct_is_confirmed(ct
)) {
387 /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
388 if (test_bit(SCTP_CID_ABORT
, map
) ||
389 test_bit(SCTP_CID_SHUTDOWN_COMPLETE
, map
) ||
390 test_bit(SCTP_CID_COOKIE_ACK
, map
))
393 if (!sctp_new(ct
, skb
, sh
, dataoff
))
397 /* Check the verification tag (Sec 8.5) */
398 if (!test_bit(SCTP_CID_INIT
, map
) &&
399 !test_bit(SCTP_CID_SHUTDOWN_COMPLETE
, map
) &&
400 !test_bit(SCTP_CID_COOKIE_ECHO
, map
) &&
401 !test_bit(SCTP_CID_ABORT
, map
) &&
402 !test_bit(SCTP_CID_SHUTDOWN_ACK
, map
) &&
403 !test_bit(SCTP_CID_HEARTBEAT
, map
) &&
404 !test_bit(SCTP_CID_HEARTBEAT_ACK
, map
) &&
405 sh
->vtag
!= ct
->proto
.sctp
.vtag
[dir
]) {
406 pr_debug("Verification tag check failed\n");
410 old_state
= new_state
= SCTP_CONNTRACK_NONE
;
411 spin_lock_bh(&ct
->lock
);
412 for_each_sctp_chunk (skb
, sch
, _sch
, offset
, dataoff
, count
) {
413 /* Special cases of Verification tag check (Sec 8.5.1) */
414 if (sch
->type
== SCTP_CID_INIT
) {
418 } else if (sch
->type
== SCTP_CID_ABORT
) {
420 if (sh
->vtag
!= ct
->proto
.sctp
.vtag
[dir
] &&
421 sh
->vtag
!= ct
->proto
.sctp
.vtag
[!dir
])
423 } else if (sch
->type
== SCTP_CID_SHUTDOWN_COMPLETE
) {
425 if (sh
->vtag
!= ct
->proto
.sctp
.vtag
[dir
] &&
426 sh
->vtag
!= ct
->proto
.sctp
.vtag
[!dir
] &&
427 sch
->flags
& SCTP_CHUNK_FLAG_T
)
429 } else if (sch
->type
== SCTP_CID_COOKIE_ECHO
) {
431 if (sh
->vtag
!= ct
->proto
.sctp
.vtag
[dir
])
433 } else if (sch
->type
== SCTP_CID_HEARTBEAT
) {
434 if (ct
->proto
.sctp
.vtag
[dir
] == 0) {
435 pr_debug("Setting %d vtag %x for dir %d\n", sch
->type
, sh
->vtag
, dir
);
436 ct
->proto
.sctp
.vtag
[dir
] = sh
->vtag
;
437 } else if (sh
->vtag
!= ct
->proto
.sctp
.vtag
[dir
]) {
438 if (test_bit(SCTP_CID_DATA
, map
) || ignore
)
441 ct
->proto
.sctp
.flags
|= SCTP_FLAG_HEARTBEAT_VTAG_FAILED
;
442 ct
->proto
.sctp
.last_dir
= dir
;
445 } else if (ct
->proto
.sctp
.flags
& SCTP_FLAG_HEARTBEAT_VTAG_FAILED
) {
446 ct
->proto
.sctp
.flags
&= ~SCTP_FLAG_HEARTBEAT_VTAG_FAILED
;
448 } else if (sch
->type
== SCTP_CID_HEARTBEAT_ACK
) {
449 if (ct
->proto
.sctp
.vtag
[dir
] == 0) {
450 pr_debug("Setting vtag %x for dir %d\n",
452 ct
->proto
.sctp
.vtag
[dir
] = sh
->vtag
;
453 } else if (sh
->vtag
!= ct
->proto
.sctp
.vtag
[dir
]) {
454 if (test_bit(SCTP_CID_DATA
, map
) || ignore
)
457 if ((ct
->proto
.sctp
.flags
& SCTP_FLAG_HEARTBEAT_VTAG_FAILED
) == 0 ||
458 ct
->proto
.sctp
.last_dir
== dir
)
461 ct
->proto
.sctp
.flags
&= ~SCTP_FLAG_HEARTBEAT_VTAG_FAILED
;
462 ct
->proto
.sctp
.vtag
[dir
] = sh
->vtag
;
463 ct
->proto
.sctp
.vtag
[!dir
] = 0;
464 } else if (ct
->proto
.sctp
.flags
& SCTP_FLAG_HEARTBEAT_VTAG_FAILED
) {
465 ct
->proto
.sctp
.flags
&= ~SCTP_FLAG_HEARTBEAT_VTAG_FAILED
;
469 old_state
= ct
->proto
.sctp
.state
;
470 new_state
= sctp_new_state(dir
, old_state
, sch
->type
);
473 if (new_state
== SCTP_CONNTRACK_MAX
) {
474 pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
476 dir
, sch
->type
, old_state
);
480 /* If it is an INIT or an INIT ACK note down the vtag */
481 if (sch
->type
== SCTP_CID_INIT
||
482 sch
->type
== SCTP_CID_INIT_ACK
) {
483 struct sctp_inithdr _inithdr
, *ih
;
485 ih
= skb_header_pointer(skb
, offset
+ sizeof(_sch
),
486 sizeof(_inithdr
), &_inithdr
);
489 pr_debug("Setting vtag %x for dir %d\n",
491 ct
->proto
.sctp
.vtag
[!dir
] = ih
->init_tag
;
494 ct
->proto
.sctp
.state
= new_state
;
495 if (old_state
!= new_state
)
496 nf_conntrack_event_cache(IPCT_PROTOINFO
, ct
);
498 spin_unlock_bh(&ct
->lock
);
500 /* allow but do not refresh timeout */
504 timeouts
= nf_ct_timeout_lookup(ct
);
506 timeouts
= nf_sctp_pernet(nf_ct_net(ct
))->timeouts
;
508 nf_ct_refresh_acct(ct
, ctinfo
, skb
, timeouts
[new_state
]);
510 if (old_state
== SCTP_CONNTRACK_COOKIE_ECHOED
&&
511 dir
== IP_CT_DIR_REPLY
&&
512 new_state
== SCTP_CONNTRACK_ESTABLISHED
) {
513 pr_debug("Setting assured bit\n");
514 set_bit(IPS_ASSURED_BIT
, &ct
->status
);
515 nf_conntrack_event_cache(IPCT_ASSURED
, ct
);
521 spin_unlock_bh(&ct
->lock
);
526 static bool sctp_can_early_drop(const struct nf_conn
*ct
)
528 switch (ct
->proto
.sctp
.state
) {
529 case SCTP_CONNTRACK_SHUTDOWN_SENT
:
530 case SCTP_CONNTRACK_SHUTDOWN_RECD
:
531 case SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
:
540 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
542 #include <linux/netfilter/nfnetlink.h>
543 #include <linux/netfilter/nfnetlink_conntrack.h>
545 static int sctp_to_nlattr(struct sk_buff
*skb
, struct nlattr
*nla
,
546 struct nf_conn
*ct
, bool destroy
)
548 struct nlattr
*nest_parms
;
550 spin_lock_bh(&ct
->lock
);
551 nest_parms
= nla_nest_start(skb
, CTA_PROTOINFO_SCTP
);
553 goto nla_put_failure
;
555 if (nla_put_u8(skb
, CTA_PROTOINFO_SCTP_STATE
, ct
->proto
.sctp
.state
))
556 goto nla_put_failure
;
561 if (nla_put_be32(skb
, CTA_PROTOINFO_SCTP_VTAG_ORIGINAL
,
562 ct
->proto
.sctp
.vtag
[IP_CT_DIR_ORIGINAL
]) ||
563 nla_put_be32(skb
, CTA_PROTOINFO_SCTP_VTAG_REPLY
,
564 ct
->proto
.sctp
.vtag
[IP_CT_DIR_REPLY
]))
565 goto nla_put_failure
;
568 spin_unlock_bh(&ct
->lock
);
569 nla_nest_end(skb
, nest_parms
);
574 spin_unlock_bh(&ct
->lock
);
578 static const struct nla_policy sctp_nla_policy
[CTA_PROTOINFO_SCTP_MAX
+1] = {
579 [CTA_PROTOINFO_SCTP_STATE
] = { .type
= NLA_U8
},
580 [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL
] = { .type
= NLA_U32
},
581 [CTA_PROTOINFO_SCTP_VTAG_REPLY
] = { .type
= NLA_U32
},
584 #define SCTP_NLATTR_SIZE ( \
585 NLA_ALIGN(NLA_HDRLEN + 1) + \
586 NLA_ALIGN(NLA_HDRLEN + 4) + \
587 NLA_ALIGN(NLA_HDRLEN + 4))
589 static int nlattr_to_sctp(struct nlattr
*cda
[], struct nf_conn
*ct
)
591 struct nlattr
*attr
= cda
[CTA_PROTOINFO_SCTP
];
592 struct nlattr
*tb
[CTA_PROTOINFO_SCTP_MAX
+1];
595 /* updates may not contain the internal protocol info, skip parsing */
599 err
= nla_parse_nested_deprecated(tb
, CTA_PROTOINFO_SCTP_MAX
, attr
,
600 sctp_nla_policy
, NULL
);
604 if (!tb
[CTA_PROTOINFO_SCTP_STATE
] ||
605 !tb
[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL
] ||
606 !tb
[CTA_PROTOINFO_SCTP_VTAG_REPLY
])
609 spin_lock_bh(&ct
->lock
);
610 ct
->proto
.sctp
.state
= nla_get_u8(tb
[CTA_PROTOINFO_SCTP_STATE
]);
611 ct
->proto
.sctp
.vtag
[IP_CT_DIR_ORIGINAL
] =
612 nla_get_be32(tb
[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL
]);
613 ct
->proto
.sctp
.vtag
[IP_CT_DIR_REPLY
] =
614 nla_get_be32(tb
[CTA_PROTOINFO_SCTP_VTAG_REPLY
]);
615 spin_unlock_bh(&ct
->lock
);
621 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
623 #include <linux/netfilter/nfnetlink.h>
624 #include <linux/netfilter/nfnetlink_cttimeout.h>
626 static int sctp_timeout_nlattr_to_obj(struct nlattr
*tb
[],
627 struct net
*net
, void *data
)
629 unsigned int *timeouts
= data
;
630 struct nf_sctp_net
*sn
= nf_sctp_pernet(net
);
634 timeouts
= sn
->timeouts
;
636 /* set default SCTP timeouts. */
637 for (i
=0; i
<SCTP_CONNTRACK_MAX
; i
++)
638 timeouts
[i
] = sn
->timeouts
[i
];
640 /* there's a 1:1 mapping between attributes and protocol states. */
641 for (i
=CTA_TIMEOUT_SCTP_UNSPEC
+1; i
<CTA_TIMEOUT_SCTP_MAX
+1; i
++) {
643 timeouts
[i
] = ntohl(nla_get_be32(tb
[i
])) * HZ
;
647 timeouts
[CTA_TIMEOUT_SCTP_UNSPEC
] = timeouts
[CTA_TIMEOUT_SCTP_CLOSED
];
652 sctp_timeout_obj_to_nlattr(struct sk_buff
*skb
, const void *data
)
654 const unsigned int *timeouts
= data
;
657 for (i
=CTA_TIMEOUT_SCTP_UNSPEC
+1; i
<CTA_TIMEOUT_SCTP_MAX
+1; i
++) {
658 if (nla_put_be32(skb
, i
, htonl(timeouts
[i
] / HZ
)))
659 goto nla_put_failure
;
667 static const struct nla_policy
668 sctp_timeout_nla_policy
[CTA_TIMEOUT_SCTP_MAX
+1] = {
669 [CTA_TIMEOUT_SCTP_CLOSED
] = { .type
= NLA_U32
},
670 [CTA_TIMEOUT_SCTP_COOKIE_WAIT
] = { .type
= NLA_U32
},
671 [CTA_TIMEOUT_SCTP_COOKIE_ECHOED
] = { .type
= NLA_U32
},
672 [CTA_TIMEOUT_SCTP_ESTABLISHED
] = { .type
= NLA_U32
},
673 [CTA_TIMEOUT_SCTP_SHUTDOWN_SENT
] = { .type
= NLA_U32
},
674 [CTA_TIMEOUT_SCTP_SHUTDOWN_RECD
] = { .type
= NLA_U32
},
675 [CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT
] = { .type
= NLA_U32
},
676 [CTA_TIMEOUT_SCTP_HEARTBEAT_SENT
] = { .type
= NLA_U32
},
677 [CTA_TIMEOUT_SCTP_HEARTBEAT_ACKED
] = { .type
= NLA_U32
},
679 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
681 void nf_conntrack_sctp_init_net(struct net
*net
)
683 struct nf_sctp_net
*sn
= nf_sctp_pernet(net
);
686 for (i
= 0; i
< SCTP_CONNTRACK_MAX
; i
++)
687 sn
->timeouts
[i
] = sctp_timeouts
[i
];
689 /* timeouts[0] is unused, init it so ->timeouts[0] contains
690 * 'new' timeout, like udp or icmp.
692 sn
->timeouts
[0] = sctp_timeouts
[SCTP_CONNTRACK_CLOSED
];
695 const struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp
= {
696 .l4proto
= IPPROTO_SCTP
,
697 #ifdef CONFIG_NF_CONNTRACK_PROCFS
698 .print_conntrack
= sctp_print_conntrack
,
700 .can_early_drop
= sctp_can_early_drop
,
701 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
702 .nlattr_size
= SCTP_NLATTR_SIZE
,
703 .to_nlattr
= sctp_to_nlattr
,
704 .from_nlattr
= nlattr_to_sctp
,
705 .tuple_to_nlattr
= nf_ct_port_tuple_to_nlattr
,
706 .nlattr_tuple_size
= nf_ct_port_nlattr_tuple_size
,
707 .nlattr_to_tuple
= nf_ct_port_nlattr_to_tuple
,
708 .nla_policy
= nf_ct_port_nla_policy
,
710 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
712 .nlattr_to_obj
= sctp_timeout_nlattr_to_obj
,
713 .obj_to_nlattr
= sctp_timeout_obj_to_nlattr
,
714 .nlattr_max
= CTA_TIMEOUT_SCTP_MAX
,
715 .obj_size
= sizeof(unsigned int) * SCTP_CONNTRACK_MAX
,
716 .nla_policy
= sctp_timeout_nla_policy
,
718 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */