1 #include <linux/kernel.h>
3 #include <linux/sctp.h>
5 #include <net/ip6_checksum.h>
6 #include <linux/netfilter.h>
7 #include <linux/netfilter_ipv4.h>
8 #include <net/sctp/checksum.h>
12 sctp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
13 int *verdict, struct ip_vs_conn **cpp,
14 struct ip_vs_iphdr *iph)
17 struct ip_vs_service *svc;
18 struct netns_ipvs *ipvs;
19 sctp_chunkhdr_t _schunkh, *sch;
20 sctp_sctphdr_t *sh, _sctph;
22 sh = skb_header_pointer(skb, iph->len, sizeof(_sctph), &_sctph);
26 sch = skb_header_pointer(skb, iph->len + sizeof(sctp_sctphdr_t),
27 sizeof(_schunkh), &_schunkh);
33 if ((sch->type == SCTP_CID_INIT || sysctl_sloppy_sctp(ipvs)) &&
34 (svc = ip_vs_service_find(net, af, skb->mark, iph->protocol,
35 &iph->daddr, sh->dest))) {
38 if (ip_vs_todrop(ipvs)) {
40 * It seems that we are very loaded.
41 * We have to drop this packet :(
48 * Let the virtual server select a real server for the
49 * incoming connection, and create a connection entry.
51 *cpp = ip_vs_schedule(svc, skb, pd, &ignored, iph);
52 if (!*cpp && ignored <= 0) {
54 *verdict = ip_vs_leave(svc, skb, pd, iph);
66 static void sctp_nat_csum(struct sk_buff *skb, sctp_sctphdr_t *sctph,
67 unsigned int sctphoff)
72 crc32 = sctp_start_cksum((__u8 *)sctph, skb_headlen(skb) - sctphoff);
73 skb_walk_frags(skb, iter)
74 crc32 = sctp_update_cksum((u8 *) iter->data,
75 skb_headlen(iter), crc32);
76 sctph->checksum = sctp_end_cksum(crc32);
78 skb->ip_summed = CHECKSUM_UNNECESSARY;
82 sctp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
83 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph)
85 sctp_sctphdr_t *sctph;
86 unsigned int sctphoff = iph->len;
88 #ifdef CONFIG_IP_VS_IPV6
89 if (cp->af == AF_INET6 && iph->fragoffs)
93 /* csum_check requires unshared skb */
94 if (!skb_make_writable(skb, sctphoff + sizeof(*sctph)))
97 if (unlikely(cp->app != NULL)) {
98 /* Some checks before mangling */
99 if (pp->csum_check && !pp->csum_check(cp->af, skb, pp))
102 /* Call application helper if needed */
103 if (!ip_vs_app_pkt_out(cp, skb))
107 sctph = (void *) skb_network_header(skb) + sctphoff;
108 sctph->source = cp->vport;
110 sctp_nat_csum(skb, sctph, sctphoff);
116 sctp_dnat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
117 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph)
119 sctp_sctphdr_t *sctph;
120 unsigned int sctphoff = iph->len;
122 #ifdef CONFIG_IP_VS_IPV6
123 if (cp->af == AF_INET6 && iph->fragoffs)
127 /* csum_check requires unshared skb */
128 if (!skb_make_writable(skb, sctphoff + sizeof(*sctph)))
131 if (unlikely(cp->app != NULL)) {
132 /* Some checks before mangling */
133 if (pp->csum_check && !pp->csum_check(cp->af, skb, pp))
136 /* Call application helper if needed */
137 if (!ip_vs_app_pkt_in(cp, skb))
141 sctph = (void *) skb_network_header(skb) + sctphoff;
142 sctph->dest = cp->dport;
144 sctp_nat_csum(skb, sctph, sctphoff);
150 sctp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp)
152 unsigned int sctphoff;
153 struct sctphdr *sh, _sctph;
154 struct sk_buff *iter;
159 #ifdef CONFIG_IP_VS_IPV6
161 sctphoff = sizeof(struct ipv6hdr);
164 sctphoff = ip_hdrlen(skb);
166 sh = skb_header_pointer(skb, sctphoff, sizeof(_sctph), &_sctph);
172 tmp = sctp_start_cksum((__u8 *) sh, skb_headlen(skb));
173 skb_walk_frags(skb, iter)
174 tmp = sctp_update_cksum((__u8 *) iter->data,
175 skb_headlen(iter), tmp);
177 val = sctp_end_cksum(tmp);
180 /* CRC failure, dump it. */
181 IP_VS_DBG_RL_PKT(0, af, pp, skb, 0,
182 "Failed checksum for");
188 enum ipvs_sctp_event_t {
189 IP_VS_SCTP_DATA = 0, /* DATA, SACK, HEARTBEATs */
192 IP_VS_SCTP_COOKIE_ECHO,
193 IP_VS_SCTP_COOKIE_ACK,
195 IP_VS_SCTP_SHUTDOWN_ACK,
196 IP_VS_SCTP_SHUTDOWN_COMPLETE,
199 IP_VS_SCTP_EVENT_LAST
202 /* RFC 2960, 3.2 Chunk Field Descriptions */
203 static __u8 sctp_events[] = {
204 [SCTP_CID_DATA] = IP_VS_SCTP_DATA,
205 [SCTP_CID_INIT] = IP_VS_SCTP_INIT,
206 [SCTP_CID_INIT_ACK] = IP_VS_SCTP_INIT_ACK,
207 [SCTP_CID_SACK] = IP_VS_SCTP_DATA,
208 [SCTP_CID_HEARTBEAT] = IP_VS_SCTP_DATA,
209 [SCTP_CID_HEARTBEAT_ACK] = IP_VS_SCTP_DATA,
210 [SCTP_CID_ABORT] = IP_VS_SCTP_ABORT,
211 [SCTP_CID_SHUTDOWN] = IP_VS_SCTP_SHUTDOWN,
212 [SCTP_CID_SHUTDOWN_ACK] = IP_VS_SCTP_SHUTDOWN_ACK,
213 [SCTP_CID_ERROR] = IP_VS_SCTP_ERROR,
214 [SCTP_CID_COOKIE_ECHO] = IP_VS_SCTP_COOKIE_ECHO,
215 [SCTP_CID_COOKIE_ACK] = IP_VS_SCTP_COOKIE_ACK,
216 [SCTP_CID_ECN_ECNE] = IP_VS_SCTP_DATA,
217 [SCTP_CID_ECN_CWR] = IP_VS_SCTP_DATA,
218 [SCTP_CID_SHUTDOWN_COMPLETE] = IP_VS_SCTP_SHUTDOWN_COMPLETE,
222 * See RFC 2960, 4. SCTP Association State Diagram
224 * New states (not in diagram):
225 * - INIT1 state: use shorter timeout for dropped INIT packets
226 * - REJECTED state: use shorter timeout if INIT is rejected with ABORT
227 * - INIT, COOKIE_SENT, COOKIE_REPLIED, COOKIE states: for better debugging
229 * The states are as seen in real server. In the diagram, INIT1, INIT,
230 * COOKIE_SENT and COOKIE_REPLIED processing happens in CLOSED state.
232 * States as per packets from client (C) and server (S):
234 * Setup of client connection:
235 * IP_VS_SCTP_S_INIT1: First C:INIT sent, wait for S:INIT-ACK
236 * IP_VS_SCTP_S_INIT: Next C:INIT sent, wait for S:INIT-ACK
237 * IP_VS_SCTP_S_COOKIE_SENT: S:INIT-ACK sent, wait for C:COOKIE-ECHO
238 * IP_VS_SCTP_S_COOKIE_REPLIED: C:COOKIE-ECHO sent, wait for S:COOKIE-ACK
240 * Setup of server connection:
241 * IP_VS_SCTP_S_COOKIE_WAIT: S:INIT sent, wait for C:INIT-ACK
242 * IP_VS_SCTP_S_COOKIE: C:INIT-ACK sent, wait for S:COOKIE-ECHO
243 * IP_VS_SCTP_S_COOKIE_ECHOED: S:COOKIE-ECHO sent, wait for C:COOKIE-ACK
246 #define sNO IP_VS_SCTP_S_NONE
247 #define sI1 IP_VS_SCTP_S_INIT1
248 #define sIN IP_VS_SCTP_S_INIT
249 #define sCS IP_VS_SCTP_S_COOKIE_SENT
250 #define sCR IP_VS_SCTP_S_COOKIE_REPLIED
251 #define sCW IP_VS_SCTP_S_COOKIE_WAIT
252 #define sCO IP_VS_SCTP_S_COOKIE
253 #define sCE IP_VS_SCTP_S_COOKIE_ECHOED
254 #define sES IP_VS_SCTP_S_ESTABLISHED
255 #define sSS IP_VS_SCTP_S_SHUTDOWN_SENT
256 #define sSR IP_VS_SCTP_S_SHUTDOWN_RECEIVED
257 #define sSA IP_VS_SCTP_S_SHUTDOWN_ACK_SENT
258 #define sRJ IP_VS_SCTP_S_REJECTED
259 #define sCL IP_VS_SCTP_S_CLOSED
261 static const __u8 sctp_states
262 [IP_VS_DIR_LAST][IP_VS_SCTP_EVENT_LAST][IP_VS_SCTP_S_LAST] = {
264 /* sNO, sI1, sIN, sCS, sCR, sCW, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL*/
265 /* d */{sES, sI1, sIN, sCS, sCR, sCW, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL},
266 /* i */{sI1, sIN, sIN, sCS, sCR, sCW, sCO, sCE, sES, sSS, sSR, sSA, sIN, sIN},
267 /* i_a */{sCW, sCW, sCW, sCS, sCR, sCO, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL},
268 /* c_e */{sCR, sIN, sIN, sCR, sCR, sCW, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL},
269 /* c_a */{sES, sI1, sIN, sCS, sCR, sCW, sCO, sES, sES, sSS, sSR, sSA, sRJ, sCL},
270 /* s */{sSR, sI1, sIN, sCS, sCR, sCW, sCO, sCE, sSR, sSS, sSR, sSA, sRJ, sCL},
271 /* s_a */{sCL, sIN, sIN, sCS, sCR, sCW, sCO, sCE, sES, sCL, sSR, sCL, sRJ, sCL},
272 /* s_c */{sCL, sCL, sCL, sCS, sCR, sCW, sCO, sCE, sES, sSS, sSR, sCL, sRJ, sCL},
273 /* err */{sCL, sI1, sIN, sCS, sCR, sCW, sCO, sCL, sES, sSS, sSR, sSA, sRJ, sCL},
274 /* ab */{sCL, sCL, sCL, sCL, sCL, sRJ, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
277 /* sNO, sI1, sIN, sCS, sCR, sCW, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL*/
278 /* d */{sES, sI1, sIN, sCS, sCR, sCW, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL},
279 /* i */{sCW, sCW, sCW, sCW, sCW, sCW, sCW, sCW, sES, sCW, sCW, sCW, sCW, sCW},
280 /* i_a */{sCS, sCS, sCS, sCS, sCR, sCW, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL},
281 /* c_e */{sCE, sCE, sCE, sCE, sCE, sCE, sCE, sCE, sES, sSS, sSR, sSA, sRJ, sCL},
282 /* c_a */{sES, sES, sES, sES, sES, sES, sES, sES, sES, sSS, sSR, sSA, sRJ, sCL},
283 /* s */{sSS, sSS, sSS, sSS, sSS, sSS, sSS, sSS, sSS, sSS, sSR, sSA, sRJ, sCL},
284 /* s_a */{sSA, sSA, sSA, sSA, sSA, sCW, sCO, sCE, sES, sSA, sSA, sSA, sRJ, sCL},
285 /* s_c */{sCL, sI1, sIN, sCS, sCR, sCW, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL},
286 /* err */{sCL, sCL, sCL, sCL, sCL, sCW, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL},
287 /* ab */{sCL, sRJ, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
290 /* sNO, sI1, sIN, sCS, sCR, sCW, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL*/
291 /* d */{sES, sI1, sIN, sCS, sCR, sES, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL},
292 /* i */{sI1, sIN, sIN, sIN, sIN, sIN, sCO, sCE, sES, sSS, sSR, sSA, sIN, sIN},
293 /* i_a */{sCE, sCE, sCE, sCE, sCE, sCE, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL},
294 /* c_e */{sES, sES, sES, sES, sES, sES, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL},
295 /* c_a */{sES, sI1, sIN, sES, sES, sCW, sES, sES, sES, sSS, sSR, sSA, sRJ, sCL},
296 /* s */{sSR, sI1, sIN, sCS, sCR, sCW, sCO, sCE, sSR, sSS, sSR, sSA, sRJ, sCL},
297 /* s_a */{sCL, sIN, sIN, sCS, sCR, sCW, sCO, sCE, sCL, sCL, sSR, sCL, sRJ, sCL},
298 /* s_c */{sCL, sCL, sCL, sCL, sCL, sCW, sCO, sCE, sES, sSS, sCL, sCL, sRJ, sCL},
299 /* err */{sCL, sI1, sIN, sCS, sCR, sCW, sCO, sCE, sES, sSS, sSR, sSA, sRJ, sCL},
300 /* ab */{sCL, sCL, sCL, sCL, sCL, sRJ, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
304 #define IP_VS_SCTP_MAX_RTO ((60 + 1) * HZ)
306 /* Timeout table[state] */
307 static const int sctp_timeouts[IP_VS_SCTP_S_LAST + 1] = {
308 [IP_VS_SCTP_S_NONE] = 2 * HZ,
309 [IP_VS_SCTP_S_INIT1] = (0 + 3 + 1) * HZ,
310 [IP_VS_SCTP_S_INIT] = IP_VS_SCTP_MAX_RTO,
311 [IP_VS_SCTP_S_COOKIE_SENT] = IP_VS_SCTP_MAX_RTO,
312 [IP_VS_SCTP_S_COOKIE_REPLIED] = IP_VS_SCTP_MAX_RTO,
313 [IP_VS_SCTP_S_COOKIE_WAIT] = IP_VS_SCTP_MAX_RTO,
314 [IP_VS_SCTP_S_COOKIE] = IP_VS_SCTP_MAX_RTO,
315 [IP_VS_SCTP_S_COOKIE_ECHOED] = IP_VS_SCTP_MAX_RTO,
316 [IP_VS_SCTP_S_ESTABLISHED] = 15 * 60 * HZ,
317 [IP_VS_SCTP_S_SHUTDOWN_SENT] = IP_VS_SCTP_MAX_RTO,
318 [IP_VS_SCTP_S_SHUTDOWN_RECEIVED] = IP_VS_SCTP_MAX_RTO,
319 [IP_VS_SCTP_S_SHUTDOWN_ACK_SENT] = IP_VS_SCTP_MAX_RTO,
320 [IP_VS_SCTP_S_REJECTED] = (0 + 3 + 1) * HZ,
321 [IP_VS_SCTP_S_CLOSED] = IP_VS_SCTP_MAX_RTO,
322 [IP_VS_SCTP_S_LAST] = 2 * HZ,
325 static const char *sctp_state_name_table[IP_VS_SCTP_S_LAST + 1] = {
326 [IP_VS_SCTP_S_NONE] = "NONE",
327 [IP_VS_SCTP_S_INIT1] = "INIT1",
328 [IP_VS_SCTP_S_INIT] = "INIT",
329 [IP_VS_SCTP_S_COOKIE_SENT] = "C-SENT",
330 [IP_VS_SCTP_S_COOKIE_REPLIED] = "C-REPLIED",
331 [IP_VS_SCTP_S_COOKIE_WAIT] = "C-WAIT",
332 [IP_VS_SCTP_S_COOKIE] = "COOKIE",
333 [IP_VS_SCTP_S_COOKIE_ECHOED] = "C-ECHOED",
334 [IP_VS_SCTP_S_ESTABLISHED] = "ESTABLISHED",
335 [IP_VS_SCTP_S_SHUTDOWN_SENT] = "S-SENT",
336 [IP_VS_SCTP_S_SHUTDOWN_RECEIVED] = "S-RECEIVED",
337 [IP_VS_SCTP_S_SHUTDOWN_ACK_SENT] = "S-ACK-SENT",
338 [IP_VS_SCTP_S_REJECTED] = "REJECTED",
339 [IP_VS_SCTP_S_CLOSED] = "CLOSED",
340 [IP_VS_SCTP_S_LAST] = "BUG!",
344 static const char *sctp_state_name(int state)
346 if (state >= IP_VS_SCTP_S_LAST)
348 if (sctp_state_name_table[state])
349 return sctp_state_name_table[state];
354 set_sctp_state(struct ip_vs_proto_data *pd, struct ip_vs_conn *cp,
355 int direction, const struct sk_buff *skb)
357 sctp_chunkhdr_t _sctpch, *sch;
358 unsigned char chunk_type;
359 int event, next_state;
362 #ifdef CONFIG_IP_VS_IPV6
363 ihl = cp->af == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr);
365 ihl = ip_hdrlen(skb);
368 cofs = ihl + sizeof(sctp_sctphdr_t);
369 sch = skb_header_pointer(skb, cofs, sizeof(_sctpch), &_sctpch);
373 chunk_type = sch->type;
375 * Section 3: Multiple chunks can be bundled into one SCTP packet
376 * up to the MTU size, except for the INIT, INIT ACK, and
377 * SHUTDOWN COMPLETE chunks. These chunks MUST NOT be bundled with
378 * any other chunk in a packet.
380 * Section 3.3.7: DATA chunks MUST NOT be bundled with ABORT. Control
381 * chunks (except for INIT, INIT ACK, and SHUTDOWN COMPLETE) MAY be
382 * bundled with an ABORT, but they MUST be placed before the ABORT
383 * in the SCTP packet or they will be ignored by the receiver.
385 if ((sch->type == SCTP_CID_COOKIE_ECHO) ||
386 (sch->type == SCTP_CID_COOKIE_ACK)) {
387 int clen = ntohs(sch->length);
389 if (clen >= sizeof(sctp_chunkhdr_t)) {
390 sch = skb_header_pointer(skb, cofs + ALIGN(clen, 4),
391 sizeof(_sctpch), &_sctpch);
392 if (sch && sch->type == SCTP_CID_ABORT)
393 chunk_type = sch->type;
397 event = (chunk_type < sizeof(sctp_events)) ?
398 sctp_events[chunk_type] : IP_VS_SCTP_DATA;
400 /* Update direction to INPUT_ONLY if necessary
401 * or delete NO_OUTPUT flag if output packet detected
403 if (cp->flags & IP_VS_CONN_F_NOOUTPUT) {
404 if (direction == IP_VS_DIR_OUTPUT)
405 cp->flags &= ~IP_VS_CONN_F_NOOUTPUT;
407 direction = IP_VS_DIR_INPUT_ONLY;
410 next_state = sctp_states[direction][event][cp->state];
412 if (next_state != cp->state) {
413 struct ip_vs_dest *dest = cp->dest;
415 IP_VS_DBG_BUF(8, "%s %s %s:%d->"
416 "%s:%d state: %s->%s conn->refcnt:%d\n",
418 ((direction == IP_VS_DIR_OUTPUT) ?
419 "output " : "input "),
420 IP_VS_DBG_ADDR(cp->af, &cp->daddr),
422 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
424 sctp_state_name(cp->state),
425 sctp_state_name(next_state),
426 atomic_read(&cp->refcnt));
428 if (!(cp->flags & IP_VS_CONN_F_INACTIVE) &&
429 (next_state != IP_VS_SCTP_S_ESTABLISHED)) {
430 atomic_dec(&dest->activeconns);
431 atomic_inc(&dest->inactconns);
432 cp->flags |= IP_VS_CONN_F_INACTIVE;
433 } else if ((cp->flags & IP_VS_CONN_F_INACTIVE) &&
434 (next_state == IP_VS_SCTP_S_ESTABLISHED)) {
435 atomic_inc(&dest->activeconns);
436 atomic_dec(&dest->inactconns);
437 cp->flags &= ~IP_VS_CONN_F_INACTIVE;
442 cp->timeout = pd->timeout_table[cp->state = next_state];
443 else /* What to do ? */
444 cp->timeout = sctp_timeouts[cp->state = next_state];
448 sctp_state_transition(struct ip_vs_conn *cp, int direction,
449 const struct sk_buff *skb, struct ip_vs_proto_data *pd)
451 spin_lock_bh(&cp->lock);
452 set_sctp_state(pd, cp, direction, skb);
453 spin_unlock_bh(&cp->lock);
456 static inline __u16 sctp_app_hashkey(__be16 port)
458 return (((__force u16)port >> SCTP_APP_TAB_BITS) ^ (__force u16)port)
462 static int sctp_register_app(struct net *net, struct ip_vs_app *inc)
466 __be16 port = inc->port;
468 struct netns_ipvs *ipvs = net_ipvs(net);
469 struct ip_vs_proto_data *pd = ip_vs_proto_data_get(net, IPPROTO_SCTP);
471 hash = sctp_app_hashkey(port);
473 list_for_each_entry(i, &ipvs->sctp_apps[hash], p_list) {
474 if (i->port == port) {
479 list_add_rcu(&inc->p_list, &ipvs->sctp_apps[hash]);
480 atomic_inc(&pd->appcnt);
486 static void sctp_unregister_app(struct net *net, struct ip_vs_app *inc)
488 struct ip_vs_proto_data *pd = ip_vs_proto_data_get(net, IPPROTO_SCTP);
490 atomic_dec(&pd->appcnt);
491 list_del_rcu(&inc->p_list);
494 static int sctp_app_conn_bind(struct ip_vs_conn *cp)
496 struct netns_ipvs *ipvs = net_ipvs(ip_vs_conn_net(cp));
498 struct ip_vs_app *inc;
501 /* Default binding: bind app only for NAT */
502 if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
504 /* Lookup application incarnations and bind the right one */
505 hash = sctp_app_hashkey(cp->vport);
508 list_for_each_entry_rcu(inc, &ipvs->sctp_apps[hash], p_list) {
509 if (inc->port == cp->vport) {
510 if (unlikely(!ip_vs_app_inc_get(inc)))
514 IP_VS_DBG_BUF(9, "%s: Binding conn %s:%u->"
515 "%s:%u to app %s on port %u\n",
517 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
519 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
521 inc->name, ntohs(inc->port));
524 result = inc->init_conn(inc, cp);
533 /* ---------------------------------------------
534 * timeouts is netns related now.
535 * ---------------------------------------------
537 static int __ip_vs_sctp_init(struct net *net, struct ip_vs_proto_data *pd)
539 struct netns_ipvs *ipvs = net_ipvs(net);
541 ip_vs_init_hash_table(ipvs->sctp_apps, SCTP_APP_TAB_SIZE);
542 pd->timeout_table = ip_vs_create_timeout_table((int *)sctp_timeouts,
543 sizeof(sctp_timeouts));
544 if (!pd->timeout_table)
549 static void __ip_vs_sctp_exit(struct net *net, struct ip_vs_proto_data *pd)
551 kfree(pd->timeout_table);
554 struct ip_vs_protocol ip_vs_protocol_sctp = {
556 .protocol = IPPROTO_SCTP,
557 .num_states = IP_VS_SCTP_S_LAST,
561 .init_netns = __ip_vs_sctp_init,
562 .exit_netns = __ip_vs_sctp_exit,
563 .register_app = sctp_register_app,
564 .unregister_app = sctp_unregister_app,
565 .conn_schedule = sctp_conn_schedule,
566 .conn_in_get = ip_vs_conn_in_get_proto,
567 .conn_out_get = ip_vs_conn_out_get_proto,
568 .snat_handler = sctp_snat_handler,
569 .dnat_handler = sctp_dnat_handler,
570 .csum_check = sctp_csum_check,
571 .state_name = sctp_state_name,
572 .state_transition = sctp_state_transition,
573 .app_conn_bind = sctp_app_conn_bind,
574 .debug_packet = ip_vs_tcpudp_debug_packet,
575 .timeout_change = NULL,