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>
18 #include <linux/module.h>
21 #include <linux/sctp.h>
22 #include <linux/string.h>
23 #include <linux/seq_file.h>
24 #include <linux/spinlock.h>
25 #include <linux/interrupt.h>
27 #include <net/netfilter/nf_conntrack.h>
28 #include <net/netfilter/nf_conntrack_l4proto.h>
29 #include <net/netfilter/nf_conntrack_ecache.h>
31 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
32 closely. They're more complex. --RR
34 And so for me for SCTP :D -Kiran */
36 static const char *const sctp_conntrack_names
[] = {
50 #define MINS * 60 SECS
51 #define HOURS * 60 MINS
52 #define DAYS * 24 HOURS
54 static unsigned int sctp_timeouts
[SCTP_CONNTRACK_MAX
] __read_mostly
= {
55 [SCTP_CONNTRACK_CLOSED
] = 10 SECS
,
56 [SCTP_CONNTRACK_COOKIE_WAIT
] = 3 SECS
,
57 [SCTP_CONNTRACK_COOKIE_ECHOED
] = 3 SECS
,
58 [SCTP_CONNTRACK_ESTABLISHED
] = 5 DAYS
,
59 [SCTP_CONNTRACK_SHUTDOWN_SENT
] = 300 SECS
/ 1000,
60 [SCTP_CONNTRACK_SHUTDOWN_RECD
] = 300 SECS
/ 1000,
61 [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
] = 3 SECS
,
62 [SCTP_CONNTRACK_HEARTBEAT_SENT
] = 30 SECS
,
63 [SCTP_CONNTRACK_HEARTBEAT_ACKED
] = 210 SECS
,
66 #define sNO SCTP_CONNTRACK_NONE
67 #define sCL SCTP_CONNTRACK_CLOSED
68 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
69 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
70 #define sES SCTP_CONNTRACK_ESTABLISHED
71 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
72 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
73 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
74 #define sHS SCTP_CONNTRACK_HEARTBEAT_SENT
75 #define sHA SCTP_CONNTRACK_HEARTBEAT_ACKED
76 #define sIV SCTP_CONNTRACK_MAX
79 These are the descriptions of the states:
81 NOTE: These state names are tantalizingly similar to the states of an
82 SCTP endpoint. But the interpretation of the states is a little different,
83 considering that these are the states of the connection and not of an end
84 point. Please note the subtleties. -Kiran
86 NONE - Nothing so far.
87 COOKIE WAIT - We have seen an INIT chunk in the original direction, or also
88 an INIT_ACK chunk in the reply direction.
89 COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction.
90 ESTABLISHED - We have seen a COOKIE_ACK in the reply direction.
91 SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction.
92 SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin.
93 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
94 to that of the SHUTDOWN chunk.
95 CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
96 the SHUTDOWN chunk. Connection is closed.
97 HEARTBEAT_SENT - We have seen a HEARTBEAT in a new flow.
98 HEARTBEAT_ACKED - We have seen a HEARTBEAT-ACK in the direction opposite to
99 that of the HEARTBEAT chunk. Secondary connection is
104 - I have assumed that the first INIT is in the original direction.
105 This messes things when an INIT comes in the reply direction in CLOSED
107 - Check the error type in the reply dir before transitioning from
108 cookie echoed to closed.
109 - Sec 5.2.4 of RFC 2960
110 - Full Multi Homing support.
113 /* SCTP conntrack state transitions */
114 static const u8 sctp_conntracks
[2][11][SCTP_CONNTRACK_MAX
] = {
117 /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */
118 /* init */ {sCW
, sCW
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sCW
, sHA
},
119 /* init_ack */ {sCL
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sCL
, sHA
},
120 /* abort */ {sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
},
121 /* shutdown */ {sCL
, sCL
, sCW
, sCE
, sSS
, sSS
, sSR
, sSA
, sCL
, sSS
},
122 /* shutdown_ack */ {sSA
, sCL
, sCW
, sCE
, sES
, sSA
, sSA
, sSA
, sSA
, sHA
},
123 /* error */ {sCL
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sCL
, sHA
},/* Can't have Stale cookie*/
124 /* cookie_echo */ {sCL
, sCL
, sCE
, sCE
, sES
, sSS
, sSR
, sSA
, sCL
, sHA
},/* 5.2.4 - Big TODO */
125 /* cookie_ack */ {sCL
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sCL
, sHA
},/* Can't come in orig dir */
126 /* shutdown_comp*/ {sCL
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sCL
, sCL
, sHA
},
127 /* heartbeat */ {sHS
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sHS
, sHA
},
128 /* heartbeat_ack*/ {sCL
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sHS
, sHA
}
132 /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */
133 /* init */ {sIV
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sIV
, sHA
},/* INIT in sCL Big TODO */
134 /* init_ack */ {sIV
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sIV
, sHA
},
135 /* abort */ {sIV
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sIV
, sCL
},
136 /* shutdown */ {sIV
, sCL
, sCW
, sCE
, sSR
, sSS
, sSR
, sSA
, sIV
, sSR
},
137 /* shutdown_ack */ {sIV
, sCL
, sCW
, sCE
, sES
, sSA
, sSA
, sSA
, sIV
, sHA
},
138 /* error */ {sIV
, sCL
, sCW
, sCL
, sES
, sSS
, sSR
, sSA
, sIV
, sHA
},
139 /* cookie_echo */ {sIV
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sIV
, sHA
},/* Can't come in reply dir */
140 /* cookie_ack */ {sIV
, sCL
, sCW
, sES
, sES
, sSS
, sSR
, sSA
, sIV
, sHA
},
141 /* shutdown_comp*/ {sIV
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sCL
, sIV
, sHA
},
142 /* heartbeat */ {sIV
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sHS
, sHA
},
143 /* heartbeat_ack*/ {sIV
, sCL
, sCW
, sCE
, sES
, sSS
, sSR
, sSA
, sHA
, sHA
}
147 static int sctp_net_id __read_mostly
;
149 struct nf_proto_net pn
;
150 unsigned int timeouts
[SCTP_CONNTRACK_MAX
];
153 static inline struct sctp_net
*sctp_pernet(struct net
*net
)
155 return net_generic(net
, sctp_net_id
);
158 static bool sctp_pkt_to_tuple(const struct sk_buff
*skb
, unsigned int dataoff
,
159 struct net
*net
, struct nf_conntrack_tuple
*tuple
)
161 const struct sctphdr
*hp
;
164 /* Actually only need first 4 bytes to get ports. */
165 hp
= skb_header_pointer(skb
, dataoff
, 4, &_hdr
);
169 tuple
->src
.u
.sctp
.port
= hp
->source
;
170 tuple
->dst
.u
.sctp
.port
= hp
->dest
;
174 static bool sctp_invert_tuple(struct nf_conntrack_tuple
*tuple
,
175 const struct nf_conntrack_tuple
*orig
)
177 tuple
->src
.u
.sctp
.port
= orig
->dst
.u
.sctp
.port
;
178 tuple
->dst
.u
.sctp
.port
= orig
->src
.u
.sctp
.port
;
182 /* Print out the per-protocol part of the tuple. */
183 static void sctp_print_tuple(struct seq_file
*s
,
184 const struct nf_conntrack_tuple
*tuple
)
186 seq_printf(s
, "sport=%hu dport=%hu ",
187 ntohs(tuple
->src
.u
.sctp
.port
),
188 ntohs(tuple
->dst
.u
.sctp
.port
));
191 /* Print out the private part of the conntrack. */
192 static void sctp_print_conntrack(struct seq_file
*s
, struct nf_conn
*ct
)
194 seq_printf(s
, "%s ", sctp_conntrack_names
[ct
->proto
.sctp
.state
]);
197 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \
198 for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0; \
199 (offset) < (skb)->len && \
200 ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \
201 (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
203 /* Some validity checks to make sure the chunks are fine */
204 static int do_basic_checks(struct nf_conn
*ct
,
205 const struct sk_buff
*skb
,
206 unsigned int dataoff
,
209 u_int32_t offset
, count
;
210 sctp_chunkhdr_t _sch
, *sch
;
215 for_each_sctp_chunk (skb
, sch
, _sch
, offset
, dataoff
, count
) {
216 pr_debug("Chunk Num: %d Type: %d\n", count
, sch
->type
);
218 if (sch
->type
== SCTP_CID_INIT
||
219 sch
->type
== SCTP_CID_INIT_ACK
||
220 sch
->type
== SCTP_CID_SHUTDOWN_COMPLETE
)
224 * Cookie Ack/Echo chunks not the first OR
225 * Init / Init Ack / Shutdown compl chunks not the only chunks
228 if (((sch
->type
== SCTP_CID_COOKIE_ACK
||
229 sch
->type
== SCTP_CID_COOKIE_ECHO
||
231 count
!= 0) || !sch
->length
) {
232 pr_debug("Basic checks failed\n");
237 set_bit(sch
->type
, map
);
240 pr_debug("Basic checks passed\n");
244 static int sctp_new_state(enum ip_conntrack_dir dir
,
245 enum sctp_conntrack cur_state
,
250 pr_debug("Chunk type: %d\n", chunk_type
);
252 switch (chunk_type
) {
254 pr_debug("SCTP_CID_INIT\n");
257 case SCTP_CID_INIT_ACK
:
258 pr_debug("SCTP_CID_INIT_ACK\n");
262 pr_debug("SCTP_CID_ABORT\n");
265 case SCTP_CID_SHUTDOWN
:
266 pr_debug("SCTP_CID_SHUTDOWN\n");
269 case SCTP_CID_SHUTDOWN_ACK
:
270 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
274 pr_debug("SCTP_CID_ERROR\n");
277 case SCTP_CID_COOKIE_ECHO
:
278 pr_debug("SCTP_CID_COOKIE_ECHO\n");
281 case SCTP_CID_COOKIE_ACK
:
282 pr_debug("SCTP_CID_COOKIE_ACK\n");
285 case SCTP_CID_SHUTDOWN_COMPLETE
:
286 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
289 case SCTP_CID_HEARTBEAT
:
290 pr_debug("SCTP_CID_HEARTBEAT");
293 case SCTP_CID_HEARTBEAT_ACK
:
294 pr_debug("SCTP_CID_HEARTBEAT_ACK");
298 /* Other chunks like DATA or SACK do not change the state */
299 pr_debug("Unknown chunk type, Will stay in %s\n",
300 sctp_conntrack_names
[cur_state
]);
304 pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n",
305 dir
, sctp_conntrack_names
[cur_state
], chunk_type
,
306 sctp_conntrack_names
[sctp_conntracks
[dir
][i
][cur_state
]]);
308 return sctp_conntracks
[dir
][i
][cur_state
];
311 static unsigned int *sctp_get_timeouts(struct net
*net
)
313 return sctp_pernet(net
)->timeouts
;
316 /* Returns verdict for packet, or -NF_ACCEPT for invalid. */
317 static int sctp_packet(struct nf_conn
*ct
,
318 const struct sk_buff
*skb
,
319 unsigned int dataoff
,
320 enum ip_conntrack_info ctinfo
,
322 unsigned int hooknum
,
323 unsigned int *timeouts
)
325 enum sctp_conntrack new_state
, old_state
;
326 enum ip_conntrack_dir dir
= CTINFO2DIR(ctinfo
);
327 const struct sctphdr
*sh
;
328 struct sctphdr _sctph
;
329 const struct sctp_chunkhdr
*sch
;
330 struct sctp_chunkhdr _sch
;
331 u_int32_t offset
, count
;
332 unsigned long map
[256 / sizeof(unsigned long)] = { 0 };
334 sh
= skb_header_pointer(skb
, dataoff
, sizeof(_sctph
), &_sctph
);
338 if (do_basic_checks(ct
, skb
, dataoff
, map
) != 0)
341 /* Check the verification tag (Sec 8.5) */
342 if (!test_bit(SCTP_CID_INIT
, map
) &&
343 !test_bit(SCTP_CID_SHUTDOWN_COMPLETE
, map
) &&
344 !test_bit(SCTP_CID_COOKIE_ECHO
, map
) &&
345 !test_bit(SCTP_CID_ABORT
, map
) &&
346 !test_bit(SCTP_CID_SHUTDOWN_ACK
, map
) &&
347 !test_bit(SCTP_CID_HEARTBEAT
, map
) &&
348 !test_bit(SCTP_CID_HEARTBEAT_ACK
, map
) &&
349 sh
->vtag
!= ct
->proto
.sctp
.vtag
[dir
]) {
350 pr_debug("Verification tag check failed\n");
354 old_state
= new_state
= SCTP_CONNTRACK_NONE
;
355 spin_lock_bh(&ct
->lock
);
356 for_each_sctp_chunk (skb
, sch
, _sch
, offset
, dataoff
, count
) {
357 /* Special cases of Verification tag check (Sec 8.5.1) */
358 if (sch
->type
== SCTP_CID_INIT
) {
362 } else if (sch
->type
== SCTP_CID_ABORT
) {
364 if (sh
->vtag
!= ct
->proto
.sctp
.vtag
[dir
] &&
365 sh
->vtag
!= ct
->proto
.sctp
.vtag
[!dir
])
367 } else if (sch
->type
== SCTP_CID_SHUTDOWN_COMPLETE
) {
369 if (sh
->vtag
!= ct
->proto
.sctp
.vtag
[dir
] &&
370 sh
->vtag
!= ct
->proto
.sctp
.vtag
[!dir
] &&
371 sch
->flags
& SCTP_CHUNK_FLAG_T
)
373 } else if (sch
->type
== SCTP_CID_COOKIE_ECHO
) {
375 if (sh
->vtag
!= ct
->proto
.sctp
.vtag
[dir
])
377 } else if (sch
->type
== SCTP_CID_HEARTBEAT
||
378 sch
->type
== SCTP_CID_HEARTBEAT_ACK
) {
379 if (ct
->proto
.sctp
.vtag
[dir
] == 0) {
380 pr_debug("Setting vtag %x for dir %d\n",
382 ct
->proto
.sctp
.vtag
[dir
] = sh
->vtag
;
383 } else if (sh
->vtag
!= ct
->proto
.sctp
.vtag
[dir
]) {
384 pr_debug("Verification tag check failed\n");
389 old_state
= ct
->proto
.sctp
.state
;
390 new_state
= sctp_new_state(dir
, old_state
, sch
->type
);
393 if (new_state
== SCTP_CONNTRACK_MAX
) {
394 pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
396 dir
, sch
->type
, old_state
);
400 /* If it is an INIT or an INIT ACK note down the vtag */
401 if (sch
->type
== SCTP_CID_INIT
||
402 sch
->type
== SCTP_CID_INIT_ACK
) {
403 sctp_inithdr_t _inithdr
, *ih
;
405 ih
= skb_header_pointer(skb
, offset
+ sizeof(sctp_chunkhdr_t
),
406 sizeof(_inithdr
), &_inithdr
);
409 pr_debug("Setting vtag %x for dir %d\n",
411 ct
->proto
.sctp
.vtag
[!dir
] = ih
->init_tag
;
414 ct
->proto
.sctp
.state
= new_state
;
415 if (old_state
!= new_state
)
416 nf_conntrack_event_cache(IPCT_PROTOINFO
, ct
);
418 spin_unlock_bh(&ct
->lock
);
420 nf_ct_refresh_acct(ct
, ctinfo
, skb
, timeouts
[new_state
]);
422 if (old_state
== SCTP_CONNTRACK_COOKIE_ECHOED
&&
423 dir
== IP_CT_DIR_REPLY
&&
424 new_state
== SCTP_CONNTRACK_ESTABLISHED
) {
425 pr_debug("Setting assured bit\n");
426 set_bit(IPS_ASSURED_BIT
, &ct
->status
);
427 nf_conntrack_event_cache(IPCT_ASSURED
, ct
);
433 spin_unlock_bh(&ct
->lock
);
438 /* Called when a new connection for this protocol found. */
439 static bool sctp_new(struct nf_conn
*ct
, const struct sk_buff
*skb
,
440 unsigned int dataoff
, unsigned int *timeouts
)
442 enum sctp_conntrack new_state
;
443 const struct sctphdr
*sh
;
444 struct sctphdr _sctph
;
445 const struct sctp_chunkhdr
*sch
;
446 struct sctp_chunkhdr _sch
;
447 u_int32_t offset
, count
;
448 unsigned long map
[256 / sizeof(unsigned long)] = { 0 };
450 sh
= skb_header_pointer(skb
, dataoff
, sizeof(_sctph
), &_sctph
);
454 if (do_basic_checks(ct
, skb
, dataoff
, map
) != 0)
457 /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
458 if (test_bit(SCTP_CID_ABORT
, map
) ||
459 test_bit(SCTP_CID_SHUTDOWN_COMPLETE
, map
) ||
460 test_bit(SCTP_CID_COOKIE_ACK
, map
))
463 memset(&ct
->proto
.sctp
, 0, sizeof(ct
->proto
.sctp
));
464 new_state
= SCTP_CONNTRACK_MAX
;
465 for_each_sctp_chunk (skb
, sch
, _sch
, offset
, dataoff
, count
) {
466 /* Don't need lock here: this conntrack not in circulation yet */
467 new_state
= sctp_new_state(IP_CT_DIR_ORIGINAL
,
468 SCTP_CONNTRACK_NONE
, sch
->type
);
470 /* Invalid: delete conntrack */
471 if (new_state
== SCTP_CONNTRACK_NONE
||
472 new_state
== SCTP_CONNTRACK_MAX
) {
473 pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
477 /* Copy the vtag into the state info */
478 if (sch
->type
== SCTP_CID_INIT
) {
480 sctp_inithdr_t _inithdr
, *ih
;
482 ih
= skb_header_pointer(skb
, offset
+ sizeof(sctp_chunkhdr_t
),
483 sizeof(_inithdr
), &_inithdr
);
487 pr_debug("Setting vtag %x for new conn\n",
490 ct
->proto
.sctp
.vtag
[IP_CT_DIR_REPLY
] =
496 } else if (sch
->type
== SCTP_CID_HEARTBEAT
) {
497 pr_debug("Setting vtag %x for secondary conntrack\n",
499 ct
->proto
.sctp
.vtag
[IP_CT_DIR_ORIGINAL
] = sh
->vtag
;
501 /* If it is a shutdown ack OOTB packet, we expect a return
502 shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
504 pr_debug("Setting vtag %x for new conn OOTB\n",
506 ct
->proto
.sctp
.vtag
[IP_CT_DIR_REPLY
] = sh
->vtag
;
509 ct
->proto
.sctp
.state
= new_state
;
515 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
517 #include <linux/netfilter/nfnetlink.h>
518 #include <linux/netfilter/nfnetlink_conntrack.h>
520 static int sctp_to_nlattr(struct sk_buff
*skb
, struct nlattr
*nla
,
523 struct nlattr
*nest_parms
;
525 spin_lock_bh(&ct
->lock
);
526 nest_parms
= nla_nest_start(skb
, CTA_PROTOINFO_SCTP
| NLA_F_NESTED
);
528 goto nla_put_failure
;
530 if (nla_put_u8(skb
, CTA_PROTOINFO_SCTP_STATE
, ct
->proto
.sctp
.state
) ||
531 nla_put_be32(skb
, CTA_PROTOINFO_SCTP_VTAG_ORIGINAL
,
532 ct
->proto
.sctp
.vtag
[IP_CT_DIR_ORIGINAL
]) ||
533 nla_put_be32(skb
, CTA_PROTOINFO_SCTP_VTAG_REPLY
,
534 ct
->proto
.sctp
.vtag
[IP_CT_DIR_REPLY
]))
535 goto nla_put_failure
;
537 spin_unlock_bh(&ct
->lock
);
539 nla_nest_end(skb
, nest_parms
);
544 spin_unlock_bh(&ct
->lock
);
548 static const struct nla_policy sctp_nla_policy
[CTA_PROTOINFO_SCTP_MAX
+1] = {
549 [CTA_PROTOINFO_SCTP_STATE
] = { .type
= NLA_U8
},
550 [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL
] = { .type
= NLA_U32
},
551 [CTA_PROTOINFO_SCTP_VTAG_REPLY
] = { .type
= NLA_U32
},
554 static int nlattr_to_sctp(struct nlattr
*cda
[], struct nf_conn
*ct
)
556 struct nlattr
*attr
= cda
[CTA_PROTOINFO_SCTP
];
557 struct nlattr
*tb
[CTA_PROTOINFO_SCTP_MAX
+1];
560 /* updates may not contain the internal protocol info, skip parsing */
564 err
= nla_parse_nested(tb
,
565 CTA_PROTOINFO_SCTP_MAX
,
571 if (!tb
[CTA_PROTOINFO_SCTP_STATE
] ||
572 !tb
[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL
] ||
573 !tb
[CTA_PROTOINFO_SCTP_VTAG_REPLY
])
576 spin_lock_bh(&ct
->lock
);
577 ct
->proto
.sctp
.state
= nla_get_u8(tb
[CTA_PROTOINFO_SCTP_STATE
]);
578 ct
->proto
.sctp
.vtag
[IP_CT_DIR_ORIGINAL
] =
579 nla_get_be32(tb
[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL
]);
580 ct
->proto
.sctp
.vtag
[IP_CT_DIR_REPLY
] =
581 nla_get_be32(tb
[CTA_PROTOINFO_SCTP_VTAG_REPLY
]);
582 spin_unlock_bh(&ct
->lock
);
587 static int sctp_nlattr_size(void)
589 return nla_total_size(0) /* CTA_PROTOINFO_SCTP */
590 + nla_policy_len(sctp_nla_policy
, CTA_PROTOINFO_SCTP_MAX
+ 1);
594 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
596 #include <linux/netfilter/nfnetlink.h>
597 #include <linux/netfilter/nfnetlink_cttimeout.h>
599 static int sctp_timeout_nlattr_to_obj(struct nlattr
*tb
[],
600 struct net
*net
, void *data
)
602 unsigned int *timeouts
= data
;
603 struct sctp_net
*sn
= sctp_pernet(net
);
606 /* set default SCTP timeouts. */
607 for (i
=0; i
<SCTP_CONNTRACK_MAX
; i
++)
608 timeouts
[i
] = sn
->timeouts
[i
];
610 /* there's a 1:1 mapping between attributes and protocol states. */
611 for (i
=CTA_TIMEOUT_SCTP_UNSPEC
+1; i
<CTA_TIMEOUT_SCTP_MAX
+1; i
++) {
613 timeouts
[i
] = ntohl(nla_get_be32(tb
[i
])) * HZ
;
620 sctp_timeout_obj_to_nlattr(struct sk_buff
*skb
, const void *data
)
622 const unsigned int *timeouts
= data
;
625 for (i
=CTA_TIMEOUT_SCTP_UNSPEC
+1; i
<CTA_TIMEOUT_SCTP_MAX
+1; i
++) {
626 if (nla_put_be32(skb
, i
, htonl(timeouts
[i
] / HZ
)))
627 goto nla_put_failure
;
635 static const struct nla_policy
636 sctp_timeout_nla_policy
[CTA_TIMEOUT_SCTP_MAX
+1] = {
637 [CTA_TIMEOUT_SCTP_CLOSED
] = { .type
= NLA_U32
},
638 [CTA_TIMEOUT_SCTP_COOKIE_WAIT
] = { .type
= NLA_U32
},
639 [CTA_TIMEOUT_SCTP_COOKIE_ECHOED
] = { .type
= NLA_U32
},
640 [CTA_TIMEOUT_SCTP_ESTABLISHED
] = { .type
= NLA_U32
},
641 [CTA_TIMEOUT_SCTP_SHUTDOWN_SENT
] = { .type
= NLA_U32
},
642 [CTA_TIMEOUT_SCTP_SHUTDOWN_RECD
] = { .type
= NLA_U32
},
643 [CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT
] = { .type
= NLA_U32
},
644 [CTA_TIMEOUT_SCTP_HEARTBEAT_SENT
] = { .type
= NLA_U32
},
645 [CTA_TIMEOUT_SCTP_HEARTBEAT_ACKED
] = { .type
= NLA_U32
},
647 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
651 static struct ctl_table sctp_sysctl_table
[] = {
653 .procname
= "nf_conntrack_sctp_timeout_closed",
654 .maxlen
= sizeof(unsigned int),
656 .proc_handler
= proc_dointvec_jiffies
,
659 .procname
= "nf_conntrack_sctp_timeout_cookie_wait",
660 .maxlen
= sizeof(unsigned int),
662 .proc_handler
= proc_dointvec_jiffies
,
665 .procname
= "nf_conntrack_sctp_timeout_cookie_echoed",
666 .maxlen
= sizeof(unsigned int),
668 .proc_handler
= proc_dointvec_jiffies
,
671 .procname
= "nf_conntrack_sctp_timeout_established",
672 .maxlen
= sizeof(unsigned int),
674 .proc_handler
= proc_dointvec_jiffies
,
677 .procname
= "nf_conntrack_sctp_timeout_shutdown_sent",
678 .maxlen
= sizeof(unsigned int),
680 .proc_handler
= proc_dointvec_jiffies
,
683 .procname
= "nf_conntrack_sctp_timeout_shutdown_recd",
684 .maxlen
= sizeof(unsigned int),
686 .proc_handler
= proc_dointvec_jiffies
,
689 .procname
= "nf_conntrack_sctp_timeout_shutdown_ack_sent",
690 .maxlen
= sizeof(unsigned int),
692 .proc_handler
= proc_dointvec_jiffies
,
695 .procname
= "nf_conntrack_sctp_timeout_heartbeat_sent",
696 .maxlen
= sizeof(unsigned int),
698 .proc_handler
= proc_dointvec_jiffies
,
701 .procname
= "nf_conntrack_sctp_timeout_heartbeat_acked",
702 .maxlen
= sizeof(unsigned int),
704 .proc_handler
= proc_dointvec_jiffies
,
710 static int sctp_kmemdup_sysctl_table(struct nf_proto_net
*pn
,
717 pn
->ctl_table
= kmemdup(sctp_sysctl_table
,
718 sizeof(sctp_sysctl_table
),
723 pn
->ctl_table
[0].data
= &sn
->timeouts
[SCTP_CONNTRACK_CLOSED
];
724 pn
->ctl_table
[1].data
= &sn
->timeouts
[SCTP_CONNTRACK_COOKIE_WAIT
];
725 pn
->ctl_table
[2].data
= &sn
->timeouts
[SCTP_CONNTRACK_COOKIE_ECHOED
];
726 pn
->ctl_table
[3].data
= &sn
->timeouts
[SCTP_CONNTRACK_ESTABLISHED
];
727 pn
->ctl_table
[4].data
= &sn
->timeouts
[SCTP_CONNTRACK_SHUTDOWN_SENT
];
728 pn
->ctl_table
[5].data
= &sn
->timeouts
[SCTP_CONNTRACK_SHUTDOWN_RECD
];
729 pn
->ctl_table
[6].data
= &sn
->timeouts
[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
];
730 pn
->ctl_table
[7].data
= &sn
->timeouts
[SCTP_CONNTRACK_HEARTBEAT_SENT
];
731 pn
->ctl_table
[8].data
= &sn
->timeouts
[SCTP_CONNTRACK_HEARTBEAT_ACKED
];
736 static int sctp_init_net(struct net
*net
, u_int16_t proto
)
738 struct sctp_net
*sn
= sctp_pernet(net
);
739 struct nf_proto_net
*pn
= &sn
->pn
;
744 for (i
= 0; i
< SCTP_CONNTRACK_MAX
; i
++)
745 sn
->timeouts
[i
] = sctp_timeouts
[i
];
748 return sctp_kmemdup_sysctl_table(pn
, sn
);
751 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly
= {
753 .l4proto
= IPPROTO_SCTP
,
755 .pkt_to_tuple
= sctp_pkt_to_tuple
,
756 .invert_tuple
= sctp_invert_tuple
,
757 .print_tuple
= sctp_print_tuple
,
758 .print_conntrack
= sctp_print_conntrack
,
759 .packet
= sctp_packet
,
760 .get_timeouts
= sctp_get_timeouts
,
763 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
764 .to_nlattr
= sctp_to_nlattr
,
765 .nlattr_size
= sctp_nlattr_size
,
766 .from_nlattr
= nlattr_to_sctp
,
767 .tuple_to_nlattr
= nf_ct_port_tuple_to_nlattr
,
768 .nlattr_tuple_size
= nf_ct_port_nlattr_tuple_size
,
769 .nlattr_to_tuple
= nf_ct_port_nlattr_to_tuple
,
770 .nla_policy
= nf_ct_port_nla_policy
,
772 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
774 .nlattr_to_obj
= sctp_timeout_nlattr_to_obj
,
775 .obj_to_nlattr
= sctp_timeout_obj_to_nlattr
,
776 .nlattr_max
= CTA_TIMEOUT_SCTP_MAX
,
777 .obj_size
= sizeof(unsigned int) * SCTP_CONNTRACK_MAX
,
778 .nla_policy
= sctp_timeout_nla_policy
,
780 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
781 .net_id
= &sctp_net_id
,
782 .init_net
= sctp_init_net
,
785 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly
= {
787 .l4proto
= IPPROTO_SCTP
,
789 .pkt_to_tuple
= sctp_pkt_to_tuple
,
790 .invert_tuple
= sctp_invert_tuple
,
791 .print_tuple
= sctp_print_tuple
,
792 .print_conntrack
= sctp_print_conntrack
,
793 .packet
= sctp_packet
,
794 .get_timeouts
= sctp_get_timeouts
,
797 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
798 .to_nlattr
= sctp_to_nlattr
,
799 .nlattr_size
= sctp_nlattr_size
,
800 .from_nlattr
= nlattr_to_sctp
,
801 .tuple_to_nlattr
= nf_ct_port_tuple_to_nlattr
,
802 .nlattr_tuple_size
= nf_ct_port_nlattr_tuple_size
,
803 .nlattr_to_tuple
= nf_ct_port_nlattr_to_tuple
,
804 .nla_policy
= nf_ct_port_nla_policy
,
805 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
807 .nlattr_to_obj
= sctp_timeout_nlattr_to_obj
,
808 .obj_to_nlattr
= sctp_timeout_obj_to_nlattr
,
809 .nlattr_max
= CTA_TIMEOUT_SCTP_MAX
,
810 .obj_size
= sizeof(unsigned int) * SCTP_CONNTRACK_MAX
,
811 .nla_policy
= sctp_timeout_nla_policy
,
813 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
815 .net_id
= &sctp_net_id
,
816 .init_net
= sctp_init_net
,
819 static int sctp_net_init(struct net
*net
)
823 ret
= nf_ct_l4proto_pernet_register(net
, &nf_conntrack_l4proto_sctp4
);
825 pr_err("nf_conntrack_sctp4: pernet registration failed.\n");
828 ret
= nf_ct_l4proto_pernet_register(net
, &nf_conntrack_l4proto_sctp6
);
830 pr_err("nf_conntrack_sctp6: pernet registration failed.\n");
836 nf_ct_l4proto_pernet_unregister(net
, &nf_conntrack_l4proto_sctp4
);
841 static void sctp_net_exit(struct net
*net
)
843 nf_ct_l4proto_pernet_unregister(net
, &nf_conntrack_l4proto_sctp6
);
844 nf_ct_l4proto_pernet_unregister(net
, &nf_conntrack_l4proto_sctp4
);
847 static struct pernet_operations sctp_net_ops
= {
848 .init
= sctp_net_init
,
849 .exit
= sctp_net_exit
,
851 .size
= sizeof(struct sctp_net
),
854 static int __init
nf_conntrack_proto_sctp_init(void)
858 ret
= register_pernet_subsys(&sctp_net_ops
);
862 ret
= nf_ct_l4proto_register(&nf_conntrack_l4proto_sctp4
);
866 ret
= nf_ct_l4proto_register(&nf_conntrack_l4proto_sctp6
);
872 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp4
);
874 unregister_pernet_subsys(&sctp_net_ops
);
879 static void __exit
nf_conntrack_proto_sctp_fini(void)
881 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp6
);
882 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp4
);
883 unregister_pernet_subsys(&sctp_net_ops
);
886 module_init(nf_conntrack_proto_sctp_init
);
887 module_exit(nf_conntrack_proto_sctp_fini
);
889 MODULE_LICENSE("GPL");
890 MODULE_AUTHOR("Kiran Kumar Immidi");
891 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
892 MODULE_ALIAS("ip_conntrack_proto_sctp");