1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/kernel.h>
4 #include <linux/sctp.h>
6 #include <net/ip6_checksum.h>
7 #include <linux/netfilter.h>
8 #include <linux/netfilter_ipv4.h>
9 #include <net/sctp/checksum.h>
10 #include <net/ip_vs.h>
13 sctp_conn_schedule(struct netns_ipvs
*ipvs
, int af
, struct sk_buff
*skb
,
14 struct ip_vs_proto_data
*pd
,
15 int *verdict
, struct ip_vs_conn
**cpp
,
16 struct ip_vs_iphdr
*iph
)
18 struct ip_vs_service
*svc
;
19 struct sctp_chunkhdr _schunkh
, *sch
;
20 struct sctphdr
*sh
, _sctph
;
21 __be16 _ports
[2], *ports
= NULL
;
23 if (likely(!ip_vs_iph_icmp(iph
))) {
24 sh
= skb_header_pointer(skb
, iph
->len
, sizeof(_sctph
), &_sctph
);
26 sch
= skb_header_pointer(skb
, iph
->len
+ sizeof(_sctph
),
27 sizeof(_schunkh
), &_schunkh
);
29 if (sch
->type
== SCTP_CID_ABORT
||
30 !(sysctl_sloppy_sctp(ipvs
) ||
31 sch
->type
== SCTP_CID_INIT
))
37 ports
= skb_header_pointer(
38 skb
, iph
->len
, sizeof(_ports
), &_ports
);
46 if (likely(!ip_vs_iph_inverse(iph
)))
47 svc
= ip_vs_service_find(ipvs
, af
, skb
->mark
, iph
->protocol
,
48 &iph
->daddr
, ports
[1]);
50 svc
= ip_vs_service_find(ipvs
, af
, skb
->mark
, iph
->protocol
,
51 &iph
->saddr
, ports
[0]);
55 if (ip_vs_todrop(ipvs
)) {
57 * It seems that we are very loaded.
58 * We have to drop this packet :(
64 * Let the virtual server select a real server for the
65 * incoming connection, and create a connection entry.
67 *cpp
= ip_vs_schedule(svc
, skb
, pd
, &ignored
, iph
);
68 if (!*cpp
&& ignored
<= 0) {
70 *verdict
= ip_vs_leave(svc
, skb
, pd
, iph
);
80 static void sctp_nat_csum(struct sk_buff
*skb
, struct sctphdr
*sctph
,
81 unsigned int sctphoff
)
83 sctph
->checksum
= sctp_compute_cksum(skb
, sctphoff
);
84 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
88 sctp_snat_handler(struct sk_buff
*skb
, struct ip_vs_protocol
*pp
,
89 struct ip_vs_conn
*cp
, struct ip_vs_iphdr
*iph
)
91 struct sctphdr
*sctph
;
92 unsigned int sctphoff
= iph
->len
;
93 bool payload_csum
= false;
95 #ifdef CONFIG_IP_VS_IPV6
96 if (cp
->af
== AF_INET6
&& iph
->fragoffs
)
100 /* csum_check requires unshared skb */
101 if (!skb_make_writable(skb
, sctphoff
+ sizeof(*sctph
)))
104 if (unlikely(cp
->app
!= NULL
)) {
107 /* Some checks before mangling */
108 if (pp
->csum_check
&& !pp
->csum_check(cp
->af
, skb
, pp
))
111 /* Call application helper if needed */
112 ret
= ip_vs_app_pkt_out(cp
, skb
);
115 /* ret=2: csum update is needed after payload mangling */
120 sctph
= (void *) skb_network_header(skb
) + sctphoff
;
122 /* Only update csum if we really have to */
123 if (sctph
->source
!= cp
->vport
|| payload_csum
||
124 skb
->ip_summed
== CHECKSUM_PARTIAL
) {
125 sctph
->source
= cp
->vport
;
126 sctp_nat_csum(skb
, sctph
, sctphoff
);
128 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
135 sctp_dnat_handler(struct sk_buff
*skb
, struct ip_vs_protocol
*pp
,
136 struct ip_vs_conn
*cp
, struct ip_vs_iphdr
*iph
)
138 struct sctphdr
*sctph
;
139 unsigned int sctphoff
= iph
->len
;
140 bool payload_csum
= false;
142 #ifdef CONFIG_IP_VS_IPV6
143 if (cp
->af
== AF_INET6
&& iph
->fragoffs
)
147 /* csum_check requires unshared skb */
148 if (!skb_make_writable(skb
, sctphoff
+ sizeof(*sctph
)))
151 if (unlikely(cp
->app
!= NULL
)) {
154 /* Some checks before mangling */
155 if (pp
->csum_check
&& !pp
->csum_check(cp
->af
, skb
, pp
))
158 /* Call application helper if needed */
159 ret
= ip_vs_app_pkt_in(cp
, skb
);
162 /* ret=2: csum update is needed after payload mangling */
167 sctph
= (void *) skb_network_header(skb
) + sctphoff
;
169 /* Only update csum if we really have to */
170 if (sctph
->dest
!= cp
->dport
|| payload_csum
||
171 (skb
->ip_summed
== CHECKSUM_PARTIAL
&&
172 !(skb_dst(skb
)->dev
->features
& NETIF_F_SCTP_CRC
))) {
173 sctph
->dest
= cp
->dport
;
174 sctp_nat_csum(skb
, sctph
, sctphoff
);
175 } else if (skb
->ip_summed
!= CHECKSUM_PARTIAL
) {
176 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
183 sctp_csum_check(int af
, struct sk_buff
*skb
, struct ip_vs_protocol
*pp
)
185 unsigned int sctphoff
;
186 struct sctphdr
*sh
, _sctph
;
189 #ifdef CONFIG_IP_VS_IPV6
191 sctphoff
= sizeof(struct ipv6hdr
);
194 sctphoff
= ip_hdrlen(skb
);
196 sh
= skb_header_pointer(skb
, sctphoff
, sizeof(_sctph
), &_sctph
);
201 val
= sctp_compute_cksum(skb
, sctphoff
);
204 /* CRC failure, dump it. */
205 IP_VS_DBG_RL_PKT(0, af
, pp
, skb
, 0,
206 "Failed checksum for");
212 enum ipvs_sctp_event_t
{
213 IP_VS_SCTP_DATA
= 0, /* DATA, SACK, HEARTBEATs */
216 IP_VS_SCTP_COOKIE_ECHO
,
217 IP_VS_SCTP_COOKIE_ACK
,
219 IP_VS_SCTP_SHUTDOWN_ACK
,
220 IP_VS_SCTP_SHUTDOWN_COMPLETE
,
223 IP_VS_SCTP_EVENT_LAST
226 /* RFC 2960, 3.2 Chunk Field Descriptions */
227 static __u8 sctp_events
[] = {
228 [SCTP_CID_DATA
] = IP_VS_SCTP_DATA
,
229 [SCTP_CID_INIT
] = IP_VS_SCTP_INIT
,
230 [SCTP_CID_INIT_ACK
] = IP_VS_SCTP_INIT_ACK
,
231 [SCTP_CID_SACK
] = IP_VS_SCTP_DATA
,
232 [SCTP_CID_HEARTBEAT
] = IP_VS_SCTP_DATA
,
233 [SCTP_CID_HEARTBEAT_ACK
] = IP_VS_SCTP_DATA
,
234 [SCTP_CID_ABORT
] = IP_VS_SCTP_ABORT
,
235 [SCTP_CID_SHUTDOWN
] = IP_VS_SCTP_SHUTDOWN
,
236 [SCTP_CID_SHUTDOWN_ACK
] = IP_VS_SCTP_SHUTDOWN_ACK
,
237 [SCTP_CID_ERROR
] = IP_VS_SCTP_ERROR
,
238 [SCTP_CID_COOKIE_ECHO
] = IP_VS_SCTP_COOKIE_ECHO
,
239 [SCTP_CID_COOKIE_ACK
] = IP_VS_SCTP_COOKIE_ACK
,
240 [SCTP_CID_ECN_ECNE
] = IP_VS_SCTP_DATA
,
241 [SCTP_CID_ECN_CWR
] = IP_VS_SCTP_DATA
,
242 [SCTP_CID_SHUTDOWN_COMPLETE
] = IP_VS_SCTP_SHUTDOWN_COMPLETE
,
246 * See RFC 2960, 4. SCTP Association State Diagram
248 * New states (not in diagram):
249 * - INIT1 state: use shorter timeout for dropped INIT packets
250 * - REJECTED state: use shorter timeout if INIT is rejected with ABORT
251 * - INIT, COOKIE_SENT, COOKIE_REPLIED, COOKIE states: for better debugging
253 * The states are as seen in real server. In the diagram, INIT1, INIT,
254 * COOKIE_SENT and COOKIE_REPLIED processing happens in CLOSED state.
256 * States as per packets from client (C) and server (S):
258 * Setup of client connection:
259 * IP_VS_SCTP_S_INIT1: First C:INIT sent, wait for S:INIT-ACK
260 * IP_VS_SCTP_S_INIT: Next C:INIT sent, wait for S:INIT-ACK
261 * IP_VS_SCTP_S_COOKIE_SENT: S:INIT-ACK sent, wait for C:COOKIE-ECHO
262 * IP_VS_SCTP_S_COOKIE_REPLIED: C:COOKIE-ECHO sent, wait for S:COOKIE-ACK
264 * Setup of server connection:
265 * IP_VS_SCTP_S_COOKIE_WAIT: S:INIT sent, wait for C:INIT-ACK
266 * IP_VS_SCTP_S_COOKIE: C:INIT-ACK sent, wait for S:COOKIE-ECHO
267 * IP_VS_SCTP_S_COOKIE_ECHOED: S:COOKIE-ECHO sent, wait for C:COOKIE-ACK
270 #define sNO IP_VS_SCTP_S_NONE
271 #define sI1 IP_VS_SCTP_S_INIT1
272 #define sIN IP_VS_SCTP_S_INIT
273 #define sCS IP_VS_SCTP_S_COOKIE_SENT
274 #define sCR IP_VS_SCTP_S_COOKIE_REPLIED
275 #define sCW IP_VS_SCTP_S_COOKIE_WAIT
276 #define sCO IP_VS_SCTP_S_COOKIE
277 #define sCE IP_VS_SCTP_S_COOKIE_ECHOED
278 #define sES IP_VS_SCTP_S_ESTABLISHED
279 #define sSS IP_VS_SCTP_S_SHUTDOWN_SENT
280 #define sSR IP_VS_SCTP_S_SHUTDOWN_RECEIVED
281 #define sSA IP_VS_SCTP_S_SHUTDOWN_ACK_SENT
282 #define sRJ IP_VS_SCTP_S_REJECTED
283 #define sCL IP_VS_SCTP_S_CLOSED
285 static const __u8 sctp_states
286 [IP_VS_DIR_LAST
][IP_VS_SCTP_EVENT_LAST
][IP_VS_SCTP_S_LAST
] = {
288 /* sNO, sI1, sIN, sCS, sCR, sCW, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL*/
289 /* d */{sES
, sI1
, sIN
, sCS
, sCR
, sCW
, sCO
, sCE
, sES
, sSS
, sSR
, sSA
, sRJ
, sCL
},
290 /* i */{sI1
, sIN
, sIN
, sCS
, sCR
, sCW
, sCO
, sCE
, sES
, sSS
, sSR
, sSA
, sIN
, sIN
},
291 /* i_a */{sCW
, sCW
, sCW
, sCS
, sCR
, sCO
, sCO
, sCE
, sES
, sSS
, sSR
, sSA
, sRJ
, sCL
},
292 /* c_e */{sCR
, sIN
, sIN
, sCR
, sCR
, sCW
, sCO
, sCE
, sES
, sSS
, sSR
, sSA
, sRJ
, sCL
},
293 /* c_a */{sES
, sI1
, sIN
, sCS
, sCR
, sCW
, sCO
, sES
, sES
, sSS
, sSR
, sSA
, sRJ
, sCL
},
294 /* s */{sSR
, sI1
, sIN
, sCS
, sCR
, sCW
, sCO
, sCE
, sSR
, sSS
, sSR
, sSA
, sRJ
, sCL
},
295 /* s_a */{sCL
, sIN
, sIN
, sCS
, sCR
, sCW
, sCO
, sCE
, sES
, sCL
, sSR
, sCL
, sRJ
, sCL
},
296 /* s_c */{sCL
, sCL
, sCL
, sCS
, sCR
, sCW
, sCO
, sCE
, sES
, sSS
, sSR
, sCL
, sRJ
, sCL
},
297 /* err */{sCL
, sI1
, sIN
, sCS
, sCR
, sCW
, sCO
, sCL
, sES
, sSS
, sSR
, sSA
, sRJ
, sCL
},
298 /* ab */{sCL
, sCL
, sCL
, sCL
, sCL
, sRJ
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
},
301 /* sNO, sI1, sIN, sCS, sCR, sCW, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL*/
302 /* d */{sES
, sI1
, sIN
, sCS
, sCR
, sCW
, sCO
, sCE
, sES
, sSS
, sSR
, sSA
, sRJ
, sCL
},
303 /* i */{sCW
, sCW
, sCW
, sCW
, sCW
, sCW
, sCW
, sCW
, sES
, sCW
, sCW
, sCW
, sCW
, sCW
},
304 /* i_a */{sCS
, sCS
, sCS
, sCS
, sCR
, sCW
, sCO
, sCE
, sES
, sSS
, sSR
, sSA
, sRJ
, sCL
},
305 /* c_e */{sCE
, sCE
, sCE
, sCE
, sCE
, sCE
, sCE
, sCE
, sES
, sSS
, sSR
, sSA
, sRJ
, sCL
},
306 /* c_a */{sES
, sES
, sES
, sES
, sES
, sES
, sES
, sES
, sES
, sSS
, sSR
, sSA
, sRJ
, sCL
},
307 /* s */{sSS
, sSS
, sSS
, sSS
, sSS
, sSS
, sSS
, sSS
, sSS
, sSS
, sSR
, sSA
, sRJ
, sCL
},
308 /* s_a */{sSA
, sSA
, sSA
, sSA
, sSA
, sCW
, sCO
, sCE
, sES
, sSA
, sSA
, sSA
, sRJ
, sCL
},
309 /* s_c */{sCL
, sI1
, sIN
, sCS
, sCR
, sCW
, sCO
, sCE
, sES
, sSS
, sSR
, sSA
, sRJ
, sCL
},
310 /* err */{sCL
, sCL
, sCL
, sCL
, sCL
, sCW
, sCO
, sCE
, sES
, sSS
, sSR
, sSA
, sRJ
, sCL
},
311 /* ab */{sCL
, sRJ
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
},
314 /* sNO, sI1, sIN, sCS, sCR, sCW, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL*/
315 /* d */{sES
, sI1
, sIN
, sCS
, sCR
, sES
, sCO
, sCE
, sES
, sSS
, sSR
, sSA
, sRJ
, sCL
},
316 /* i */{sI1
, sIN
, sIN
, sIN
, sIN
, sIN
, sCO
, sCE
, sES
, sSS
, sSR
, sSA
, sIN
, sIN
},
317 /* i_a */{sCE
, sCE
, sCE
, sCE
, sCE
, sCE
, sCO
, sCE
, sES
, sSS
, sSR
, sSA
, sRJ
, sCL
},
318 /* c_e */{sES
, sES
, sES
, sES
, sES
, sES
, sCO
, sCE
, sES
, sSS
, sSR
, sSA
, sRJ
, sCL
},
319 /* c_a */{sES
, sI1
, sIN
, sES
, sES
, sCW
, sES
, sES
, sES
, sSS
, sSR
, sSA
, sRJ
, sCL
},
320 /* s */{sSR
, sI1
, sIN
, sCS
, sCR
, sCW
, sCO
, sCE
, sSR
, sSS
, sSR
, sSA
, sRJ
, sCL
},
321 /* s_a */{sCL
, sIN
, sIN
, sCS
, sCR
, sCW
, sCO
, sCE
, sCL
, sCL
, sSR
, sCL
, sRJ
, sCL
},
322 /* s_c */{sCL
, sCL
, sCL
, sCL
, sCL
, sCW
, sCO
, sCE
, sES
, sSS
, sCL
, sCL
, sRJ
, sCL
},
323 /* err */{sCL
, sI1
, sIN
, sCS
, sCR
, sCW
, sCO
, sCE
, sES
, sSS
, sSR
, sSA
, sRJ
, sCL
},
324 /* ab */{sCL
, sCL
, sCL
, sCL
, sCL
, sRJ
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
, sCL
},
328 #define IP_VS_SCTP_MAX_RTO ((60 + 1) * HZ)
330 /* Timeout table[state] */
331 static const int sctp_timeouts
[IP_VS_SCTP_S_LAST
+ 1] = {
332 [IP_VS_SCTP_S_NONE
] = 2 * HZ
,
333 [IP_VS_SCTP_S_INIT1
] = (0 + 3 + 1) * HZ
,
334 [IP_VS_SCTP_S_INIT
] = IP_VS_SCTP_MAX_RTO
,
335 [IP_VS_SCTP_S_COOKIE_SENT
] = IP_VS_SCTP_MAX_RTO
,
336 [IP_VS_SCTP_S_COOKIE_REPLIED
] = IP_VS_SCTP_MAX_RTO
,
337 [IP_VS_SCTP_S_COOKIE_WAIT
] = IP_VS_SCTP_MAX_RTO
,
338 [IP_VS_SCTP_S_COOKIE
] = IP_VS_SCTP_MAX_RTO
,
339 [IP_VS_SCTP_S_COOKIE_ECHOED
] = IP_VS_SCTP_MAX_RTO
,
340 [IP_VS_SCTP_S_ESTABLISHED
] = 15 * 60 * HZ
,
341 [IP_VS_SCTP_S_SHUTDOWN_SENT
] = IP_VS_SCTP_MAX_RTO
,
342 [IP_VS_SCTP_S_SHUTDOWN_RECEIVED
] = IP_VS_SCTP_MAX_RTO
,
343 [IP_VS_SCTP_S_SHUTDOWN_ACK_SENT
] = IP_VS_SCTP_MAX_RTO
,
344 [IP_VS_SCTP_S_REJECTED
] = (0 + 3 + 1) * HZ
,
345 [IP_VS_SCTP_S_CLOSED
] = IP_VS_SCTP_MAX_RTO
,
346 [IP_VS_SCTP_S_LAST
] = 2 * HZ
,
349 static const char *sctp_state_name_table
[IP_VS_SCTP_S_LAST
+ 1] = {
350 [IP_VS_SCTP_S_NONE
] = "NONE",
351 [IP_VS_SCTP_S_INIT1
] = "INIT1",
352 [IP_VS_SCTP_S_INIT
] = "INIT",
353 [IP_VS_SCTP_S_COOKIE_SENT
] = "C-SENT",
354 [IP_VS_SCTP_S_COOKIE_REPLIED
] = "C-REPLIED",
355 [IP_VS_SCTP_S_COOKIE_WAIT
] = "C-WAIT",
356 [IP_VS_SCTP_S_COOKIE
] = "COOKIE",
357 [IP_VS_SCTP_S_COOKIE_ECHOED
] = "C-ECHOED",
358 [IP_VS_SCTP_S_ESTABLISHED
] = "ESTABLISHED",
359 [IP_VS_SCTP_S_SHUTDOWN_SENT
] = "S-SENT",
360 [IP_VS_SCTP_S_SHUTDOWN_RECEIVED
] = "S-RECEIVED",
361 [IP_VS_SCTP_S_SHUTDOWN_ACK_SENT
] = "S-ACK-SENT",
362 [IP_VS_SCTP_S_REJECTED
] = "REJECTED",
363 [IP_VS_SCTP_S_CLOSED
] = "CLOSED",
364 [IP_VS_SCTP_S_LAST
] = "BUG!",
368 static const char *sctp_state_name(int state
)
370 if (state
>= IP_VS_SCTP_S_LAST
)
372 if (sctp_state_name_table
[state
])
373 return sctp_state_name_table
[state
];
378 set_sctp_state(struct ip_vs_proto_data
*pd
, struct ip_vs_conn
*cp
,
379 int direction
, const struct sk_buff
*skb
)
381 struct sctp_chunkhdr _sctpch
, *sch
;
382 unsigned char chunk_type
;
383 int event
, next_state
;
386 #ifdef CONFIG_IP_VS_IPV6
387 ihl
= cp
->af
== AF_INET
? ip_hdrlen(skb
) : sizeof(struct ipv6hdr
);
389 ihl
= ip_hdrlen(skb
);
392 cofs
= ihl
+ sizeof(struct sctphdr
);
393 sch
= skb_header_pointer(skb
, cofs
, sizeof(_sctpch
), &_sctpch
);
397 chunk_type
= sch
->type
;
399 * Section 3: Multiple chunks can be bundled into one SCTP packet
400 * up to the MTU size, except for the INIT, INIT ACK, and
401 * SHUTDOWN COMPLETE chunks. These chunks MUST NOT be bundled with
402 * any other chunk in a packet.
404 * Section 3.3.7: DATA chunks MUST NOT be bundled with ABORT. Control
405 * chunks (except for INIT, INIT ACK, and SHUTDOWN COMPLETE) MAY be
406 * bundled with an ABORT, but they MUST be placed before the ABORT
407 * in the SCTP packet or they will be ignored by the receiver.
409 if ((sch
->type
== SCTP_CID_COOKIE_ECHO
) ||
410 (sch
->type
== SCTP_CID_COOKIE_ACK
)) {
411 int clen
= ntohs(sch
->length
);
413 if (clen
>= sizeof(_sctpch
)) {
414 sch
= skb_header_pointer(skb
, cofs
+ ALIGN(clen
, 4),
415 sizeof(_sctpch
), &_sctpch
);
416 if (sch
&& sch
->type
== SCTP_CID_ABORT
)
417 chunk_type
= sch
->type
;
421 event
= (chunk_type
< sizeof(sctp_events
)) ?
422 sctp_events
[chunk_type
] : IP_VS_SCTP_DATA
;
424 /* Update direction to INPUT_ONLY if necessary
425 * or delete NO_OUTPUT flag if output packet detected
427 if (cp
->flags
& IP_VS_CONN_F_NOOUTPUT
) {
428 if (direction
== IP_VS_DIR_OUTPUT
)
429 cp
->flags
&= ~IP_VS_CONN_F_NOOUTPUT
;
431 direction
= IP_VS_DIR_INPUT_ONLY
;
434 next_state
= sctp_states
[direction
][event
][cp
->state
];
436 if (next_state
!= cp
->state
) {
437 struct ip_vs_dest
*dest
= cp
->dest
;
439 IP_VS_DBG_BUF(8, "%s %s %s:%d->"
440 "%s:%d state: %s->%s conn->refcnt:%d\n",
442 ((direction
== IP_VS_DIR_OUTPUT
) ?
443 "output " : "input "),
444 IP_VS_DBG_ADDR(cp
->daf
, &cp
->daddr
),
446 IP_VS_DBG_ADDR(cp
->af
, &cp
->caddr
),
448 sctp_state_name(cp
->state
),
449 sctp_state_name(next_state
),
450 refcount_read(&cp
->refcnt
));
452 if (!(cp
->flags
& IP_VS_CONN_F_INACTIVE
) &&
453 (next_state
!= IP_VS_SCTP_S_ESTABLISHED
)) {
454 atomic_dec(&dest
->activeconns
);
455 atomic_inc(&dest
->inactconns
);
456 cp
->flags
|= IP_VS_CONN_F_INACTIVE
;
457 } else if ((cp
->flags
& IP_VS_CONN_F_INACTIVE
) &&
458 (next_state
== IP_VS_SCTP_S_ESTABLISHED
)) {
459 atomic_inc(&dest
->activeconns
);
460 atomic_dec(&dest
->inactconns
);
461 cp
->flags
&= ~IP_VS_CONN_F_INACTIVE
;
466 cp
->timeout
= pd
->timeout_table
[cp
->state
= next_state
];
467 else /* What to do ? */
468 cp
->timeout
= sctp_timeouts
[cp
->state
= next_state
];
472 sctp_state_transition(struct ip_vs_conn
*cp
, int direction
,
473 const struct sk_buff
*skb
, struct ip_vs_proto_data
*pd
)
475 spin_lock_bh(&cp
->lock
);
476 set_sctp_state(pd
, cp
, direction
, skb
);
477 spin_unlock_bh(&cp
->lock
);
480 static inline __u16
sctp_app_hashkey(__be16 port
)
482 return (((__force u16
)port
>> SCTP_APP_TAB_BITS
) ^ (__force u16
)port
)
486 static int sctp_register_app(struct netns_ipvs
*ipvs
, struct ip_vs_app
*inc
)
490 __be16 port
= inc
->port
;
492 struct ip_vs_proto_data
*pd
= ip_vs_proto_data_get(ipvs
, IPPROTO_SCTP
);
494 hash
= sctp_app_hashkey(port
);
496 list_for_each_entry(i
, &ipvs
->sctp_apps
[hash
], p_list
) {
497 if (i
->port
== port
) {
502 list_add_rcu(&inc
->p_list
, &ipvs
->sctp_apps
[hash
]);
503 atomic_inc(&pd
->appcnt
);
509 static void sctp_unregister_app(struct netns_ipvs
*ipvs
, struct ip_vs_app
*inc
)
511 struct ip_vs_proto_data
*pd
= ip_vs_proto_data_get(ipvs
, IPPROTO_SCTP
);
513 atomic_dec(&pd
->appcnt
);
514 list_del_rcu(&inc
->p_list
);
517 static int sctp_app_conn_bind(struct ip_vs_conn
*cp
)
519 struct netns_ipvs
*ipvs
= cp
->ipvs
;
521 struct ip_vs_app
*inc
;
524 /* Default binding: bind app only for NAT */
525 if (IP_VS_FWD_METHOD(cp
) != IP_VS_CONN_F_MASQ
)
527 /* Lookup application incarnations and bind the right one */
528 hash
= sctp_app_hashkey(cp
->vport
);
530 list_for_each_entry_rcu(inc
, &ipvs
->sctp_apps
[hash
], p_list
) {
531 if (inc
->port
== cp
->vport
) {
532 if (unlikely(!ip_vs_app_inc_get(inc
)))
535 IP_VS_DBG_BUF(9, "%s: Binding conn %s:%u->"
536 "%s:%u to app %s on port %u\n",
538 IP_VS_DBG_ADDR(cp
->af
, &cp
->caddr
),
540 IP_VS_DBG_ADDR(cp
->af
, &cp
->vaddr
),
542 inc
->name
, ntohs(inc
->port
));
545 result
= inc
->init_conn(inc
, cp
);
553 /* ---------------------------------------------
554 * timeouts is netns related now.
555 * ---------------------------------------------
557 static int __ip_vs_sctp_init(struct netns_ipvs
*ipvs
, struct ip_vs_proto_data
*pd
)
559 ip_vs_init_hash_table(ipvs
->sctp_apps
, SCTP_APP_TAB_SIZE
);
560 pd
->timeout_table
= ip_vs_create_timeout_table((int *)sctp_timeouts
,
561 sizeof(sctp_timeouts
));
562 if (!pd
->timeout_table
)
567 static void __ip_vs_sctp_exit(struct netns_ipvs
*ipvs
, struct ip_vs_proto_data
*pd
)
569 kfree(pd
->timeout_table
);
572 struct ip_vs_protocol ip_vs_protocol_sctp
= {
574 .protocol
= IPPROTO_SCTP
,
575 .num_states
= IP_VS_SCTP_S_LAST
,
579 .init_netns
= __ip_vs_sctp_init
,
580 .exit_netns
= __ip_vs_sctp_exit
,
581 .register_app
= sctp_register_app
,
582 .unregister_app
= sctp_unregister_app
,
583 .conn_schedule
= sctp_conn_schedule
,
584 .conn_in_get
= ip_vs_conn_in_get_proto
,
585 .conn_out_get
= ip_vs_conn_out_get_proto
,
586 .snat_handler
= sctp_snat_handler
,
587 .dnat_handler
= sctp_dnat_handler
,
588 .csum_check
= sctp_csum_check
,
589 .state_name
= sctp_state_name
,
590 .state_transition
= sctp_state_transition
,
591 .app_conn_bind
= sctp_app_conn_bind
,
592 .debug_packet
= ip_vs_tcpudp_debug_packet
,
593 .timeout_change
= NULL
,