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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
[linux-block.git] / net / netfilter / ipvs / ip_vs_proto_sctp.c
CommitLineData
2906f66a
VMR		 1#include <linux/kernel.h>
2#include <linux/ip.h>
3#include <linux/sctp.h>
4#include <net/ip.h>
5#include <net/ip6_checksum.h>
6#include <linux/netfilter.h>
7#include <linux/netfilter_ipv4.h>
8#include <net/sctp/checksum.h>
9#include <net/ip_vs.h>
10
11
12static struct ip_vs_conn *
13sctp_conn_in_get(int af,
14 const struct sk_buff *skb,
15 struct ip_vs_protocol *pp,
16 const struct ip_vs_iphdr *iph,
17 unsigned int proto_off,
18 int inverse)
19{
20 __be16 _ports[2], *pptr;
21
22 pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports);
23 if (pptr == NULL)
24 return NULL;
25
26 if (likely(!inverse))
27 return ip_vs_conn_in_get(af, iph->protocol,
28 &iph->saddr, pptr[0],
29 &iph->daddr, pptr[1]);
30 else
31 return ip_vs_conn_in_get(af, iph->protocol,
32 &iph->daddr, pptr[1],
33 &iph->saddr, pptr[0]);
34}
35
36static struct ip_vs_conn *
37sctp_conn_out_get(int af,
38 const struct sk_buff *skb,
39 struct ip_vs_protocol *pp,
40 const struct ip_vs_iphdr *iph,
41 unsigned int proto_off,
42 int inverse)
43{
44 __be16 _ports[2], *pptr;
45
46 pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports);
47 if (pptr == NULL)
48 return NULL;
49
50 if (likely(!inverse))
51 return ip_vs_conn_out_get(af, iph->protocol,
52 &iph->saddr, pptr[0],
53 &iph->daddr, pptr[1]);
54 else
55 return ip_vs_conn_out_get(af, iph->protocol,
56 &iph->daddr, pptr[1],
57 &iph->saddr, pptr[0]);
58}
59
60static int
61sctp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,
62 int *verdict, struct ip_vs_conn **cpp)
63{
64 struct ip_vs_service *svc;
65 sctp_chunkhdr_t _schunkh, *sch;
66 sctp_sctphdr_t *sh, _sctph;
67 struct ip_vs_iphdr iph;
68
69 ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
70
71 sh = skb_header_pointer(skb, iph.len, sizeof(_sctph), &_sctph);
72 if (sh == NULL)
73 return 0;
74
75 sch = skb_header_pointer(skb, iph.len + sizeof(sctp_sctphdr_t),
76 sizeof(_schunkh), &_schunkh);
77 if (sch == NULL)
78 return 0;
79
80 if ((sch->type == SCTP_CID_INIT) &&
81 (svc = ip_vs_service_get(af, skb->mark, iph.protocol,
82 &iph.daddr, sh->dest))) {
83 if (ip_vs_todrop()) {
84 /*
85 * It seems that we are very loaded.
86 * We have to drop this packet :(
87 */
88 ip_vs_service_put(svc);
89 *verdict = NF_DROP;
90 return 0;
91 }
92 /*
93 * Let the virtual server select a real server for the
94 * incoming connection, and create a connection entry.
95 */
96 *cpp = ip_vs_schedule(svc, skb);
97 if (!*cpp) {
98 *verdict = ip_vs_leave(svc, skb, pp);
99 return 0;
100 }
101 ip_vs_service_put(svc);
102 }
103
104 return 1;
105}
106
107static int
108sctp_snat_handler(struct sk_buff *skb,
109 struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
110{
111 sctp_sctphdr_t *sctph;
112 unsigned int sctphoff;
113 __be32 crc32;
114
115#ifdef CONFIG_IP_VS_IPV6
116 if (cp->af == AF_INET6)
117 sctphoff = sizeof(struct ipv6hdr);
118 else
119#endif
120 sctphoff = ip_hdrlen(skb);
121
122 /* csum_check requires unshared skb */
123 if (!skb_make_writable(skb, sctphoff + sizeof(*sctph)))
124 return 0;
125
126 if (unlikely(cp->app != NULL)) {
127 /* Some checks before mangling */
128 if (pp->csum_check && !pp->csum_check(cp->af, skb, pp))
129 return 0;
130
131 /* Call application helper if needed */
132 if (!ip_vs_app_pkt_out(cp, skb))
133 return 0;
134 }
135
136 sctph = (void *) skb_network_header(skb) + sctphoff;
137 sctph->source = cp->vport;
138
139 /* Calculate the checksum */
140 crc32 = sctp_start_cksum((u8 *) sctph, skb_headlen(skb) - sctphoff);
141 for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next)
142 crc32 = sctp_update_cksum((u8 *) skb->data, skb_headlen(skb),
143 crc32);
144 crc32 = sctp_end_cksum(crc32);
145 sctph->checksum = crc32;
146
147 return 1;
148}
149
150static int
151sctp_dnat_handler(struct sk_buff *skb,
152 struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
153{
154
155 sctp_sctphdr_t *sctph;
156 unsigned int sctphoff;
157 __be32 crc32;
158
159#ifdef CONFIG_IP_VS_IPV6
160 if (cp->af == AF_INET6)
161 sctphoff = sizeof(struct ipv6hdr);
162 else
163#endif
164 sctphoff = ip_hdrlen(skb);
165
166 /* csum_check requires unshared skb */
167 if (!skb_make_writable(skb, sctphoff + sizeof(*sctph)))
168 return 0;
169
170 if (unlikely(cp->app != NULL)) {
171 /* Some checks before mangling */
172 if (pp->csum_check && !pp->csum_check(cp->af, skb, pp))
173 return 0;
174
175 /* Call application helper if needed */
176 if (!ip_vs_app_pkt_out(cp, skb))
177 return 0;
178 }
179
180 sctph = (void *) skb_network_header(skb) + sctphoff;
181 sctph->dest = cp->dport;
182
183 /* Calculate the checksum */
184 crc32 = sctp_start_cksum((u8 *) sctph, skb_headlen(skb) - sctphoff);
185 for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next)
186 crc32 = sctp_update_cksum((u8 *) skb->data, skb_headlen(skb),
187 crc32);
188 crc32 = sctp_end_cksum(crc32);
189 sctph->checksum = crc32;
190
191 return 1;
192}
193
194static int
195sctp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp)
196{
197 struct sk_buff *list = skb_shinfo(skb)->frag_list;
198 unsigned int sctphoff;
199 struct sctphdr *sh, _sctph;
200 __le32 cmp;
201 __le32 val;
202 __u32 tmp;
203
204#ifdef CONFIG_IP_VS_IPV6
205 if (af == AF_INET6)
206 sctphoff = sizeof(struct ipv6hdr);
207 else
208#endif
209 sctphoff = ip_hdrlen(skb);
210
211 sh = skb_header_pointer(skb, sctphoff, sizeof(_sctph), &_sctph);
212 if (sh == NULL)
213 return 0;
214
215 cmp = sh->checksum;
216
217 tmp = sctp_start_cksum((__u8 *) sh, skb_headlen(skb));
218 for (; list; list = list->next)
219 tmp = sctp_update_cksum((__u8 *) list->data,
220 skb_headlen(list), tmp);
221
222 val = sctp_end_cksum(tmp);
223
224 if (val != cmp) {
225 /* CRC failure, dump it. */
226 IP_VS_DBG_RL_PKT(0, pp, skb, 0,
227 "Failed checksum for");
228 return 0;
229 }
230 return 1;
231}
232
233struct ipvs_sctp_nextstate {
234 int next_state;
235};
236enum ipvs_sctp_event_t {
237 IP_VS_SCTP_EVE_DATA_CLI,
238 IP_VS_SCTP_EVE_DATA_SER,
239 IP_VS_SCTP_EVE_INIT_CLI,
240 IP_VS_SCTP_EVE_INIT_SER,
241 IP_VS_SCTP_EVE_INIT_ACK_CLI,
242 IP_VS_SCTP_EVE_INIT_ACK_SER,
243 IP_VS_SCTP_EVE_COOKIE_ECHO_CLI,
244 IP_VS_SCTP_EVE_COOKIE_ECHO_SER,
245 IP_VS_SCTP_EVE_COOKIE_ACK_CLI,
246 IP_VS_SCTP_EVE_COOKIE_ACK_SER,
247 IP_VS_SCTP_EVE_ABORT_CLI,
248 IP_VS_SCTP_EVE__ABORT_SER,
249 IP_VS_SCTP_EVE_SHUT_CLI,
250 IP_VS_SCTP_EVE_SHUT_SER,
251 IP_VS_SCTP_EVE_SHUT_ACK_CLI,
252 IP_VS_SCTP_EVE_SHUT_ACK_SER,
253 IP_VS_SCTP_EVE_SHUT_COM_CLI,
254 IP_VS_SCTP_EVE_SHUT_COM_SER,
255 IP_VS_SCTP_EVE_LAST
256};
257
258static enum ipvs_sctp_event_t sctp_events[255] = {
259 IP_VS_SCTP_EVE_DATA_CLI,
260 IP_VS_SCTP_EVE_INIT_CLI,
261 IP_VS_SCTP_EVE_INIT_ACK_CLI,
262 IP_VS_SCTP_EVE_DATA_CLI,
263 IP_VS_SCTP_EVE_DATA_CLI,
264 IP_VS_SCTP_EVE_DATA_CLI,
265 IP_VS_SCTP_EVE_ABORT_CLI,
266 IP_VS_SCTP_EVE_SHUT_CLI,
267 IP_VS_SCTP_EVE_SHUT_ACK_CLI,
268 IP_VS_SCTP_EVE_DATA_CLI,
269 IP_VS_SCTP_EVE_COOKIE_ECHO_CLI,
270 IP_VS_SCTP_EVE_COOKIE_ACK_CLI,
271 IP_VS_SCTP_EVE_DATA_CLI,
272 IP_VS_SCTP_EVE_DATA_CLI,
273 IP_VS_SCTP_EVE_SHUT_COM_CLI,
274};
275
276static struct ipvs_sctp_nextstate
277 sctp_states_table[IP_VS_SCTP_S_LAST][IP_VS_SCTP_EVE_LAST] = {
278 /*
279 * STATE : IP_VS_SCTP_S_NONE
280 */
281 /*next state *//*event */
282 {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ },
283 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ },
284 {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ },
285 {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ },
286 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ },
287 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ },
288 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ },
289 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ },
290 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ },
291 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ },
292 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ },
293 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ },
294 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ },
295 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ },
296 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ },
297 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ },
298 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ },
299 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ },
300 },
301 /*
302 * STATE : IP_VS_SCTP_S_INIT_CLI
303 * Cient sent INIT and is waiting for reply from server(In ECHO_WAIT)
304 */
305 {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ },
306 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ },
307 {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ },
308 {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ },
309 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ },
310 {IP_VS_SCTP_S_INIT_ACK_SER /* IP_VS_SCTP_EVE_INIT_ACK_SER */ },
311 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ECHO_CLI */ },
312 {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_ECHO_SER */ },
313 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ },
314 {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ },
315 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ },
316 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ },
317 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ },
318 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ },
319 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ },
320 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ },
321 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ },
322 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ }
323 },
324 /*
325 * State : IP_VS_SCTP_S_INIT_SER
326 * Server sent INIT and waiting for INIT ACK from the client
327 */
328 {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ },
329 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ },
330 {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ },
331 {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ },
332 {IP_VS_SCTP_S_INIT_ACK_CLI /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ },
333 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ },
334 {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ },
335 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ },
336 {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ },
337 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ },
338 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ },
339 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ },
340 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ },
341 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ },
342 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ },
343 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ },
344 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ },
345 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ }
346 },
347 /*
348 * State : IP_VS_SCTP_S_INIT_ACK_CLI
349 * Client sent INIT ACK and waiting for ECHO from the server
350 */
351 {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ },
352 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ },
353 /*
354 * We have got an INIT from client. From the spec.“Upon receipt of
355 * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with
356 * an INIT ACK using the same parameters it sent in its original
357 * INIT chunk (including its Initiate Tag, unchanged”).
358 */
359 {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ },
360 {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ },
361 /*
362 * INIT_ACK has been resent by the client, let us stay is in
363 * the same state
364 */
365 {IP_VS_SCTP_S_INIT_ACK_CLI /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ },
366 /*
367 * INIT_ACK sent by the server, close the connection
368 */
369 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ },
370 /*
371 * ECHO by client, it should not happen, close the connection
372 */
373 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ },
374 /*
375 * ECHO by server, this is what we are expecting, move to ECHO_SER
376 */
377 {IP_VS_SCTP_S_ECHO_SER /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ },
378 /*
379 * COOKIE ACK from client, it should not happen, close the connection
380 */
381 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ },
382 /*
383 * Unexpected COOKIE ACK from server, staty in the same state
384 */
385 {IP_VS_SCTP_S_INIT_ACK_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ },
386 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ },
387 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ },
388 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ },
389 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ },
390 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ },
391 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ },
392 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ },
393 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ }
394 },
395 /*
396 * State : IP_VS_SCTP_S_INIT_ACK_SER
397 * Server sent INIT ACK and waiting for ECHO from the client
398 */
399 {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ },
400 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ },
401 /*
402 * We have got an INIT from client. From the spec.“Upon receipt of
403 * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with
404 * an INIT ACK using the same parameters it sent in its original
405 * INIT chunk (including its Initiate Tag, unchanged”).
406 */
407 {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ },
408 {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ },
409 /*
410 * Unexpected INIT_ACK by the client, let us close the connection
411 */
412 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ },
413 /*
414 * INIT_ACK resent by the server, let us move to same state
415 */
416 {IP_VS_SCTP_S_INIT_ACK_SER /* IP_VS_SCTP_EVE_INIT_ACK_SER */ },
417 /*
418 * Client send the ECHO, this is what we are expecting,
419 * move to ECHO_CLI
420 */
421 {IP_VS_SCTP_S_ECHO_CLI /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ },
422 /*
423 * ECHO received from the server, Not sure what to do,
424 * let us close it
425 */
426 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ },
427 /*
428 * COOKIE ACK from client, let us stay in the same state
429 */
430 {IP_VS_SCTP_S_INIT_ACK_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ },
431 /*
432 * COOKIE ACK from server, hmm... this should not happen, lets close
433 * the connection.
434 */
435 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ },
436 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ },
437 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ },
438 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ },
439 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ },
440 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ },
441 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ },
442 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ },
443 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ }
444 },
445 /*
446 * State : IP_VS_SCTP_S_ECHO_CLI
447 * Cient sent ECHO and waiting COOKEI ACK from the Server
448 */
449 {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ },
450 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ },
451 /*
452 * We have got an INIT from client. From the spec.“Upon receipt of
453 * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with
454 * an INIT ACK using the same parameters it sent in its original
455 * INIT chunk (including its Initiate Tag, unchanged”).
456 */
457 {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ },
458 {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ },
459 /*
460 * INIT_ACK has been by the client, let us close the connection
461 */
462 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ },
463 /*
464 * INIT_ACK sent by the server, Unexpected INIT ACK, spec says,
465 * “If an INIT ACK is received by an endpoint in any state other
466 * than the COOKIE-WAIT state, the endpoint should discard the
467 * INIT ACK chunk”. Stay in the same state
468 */
469 {IP_VS_SCTP_S_ECHO_CLI /* IP_VS_SCTP_EVE_INIT_ACK_SER */ },
470 /*
471 * Client resent the ECHO, let us stay in the same state
472 */
473 {IP_VS_SCTP_S_ECHO_CLI /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ },
474 /*
475 * ECHO received from the server, Not sure what to do,
476 * let us close it
477 */
478 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ },
479 /*
480 * COOKIE ACK from client, this shoud not happen, let's close the
481 * connection
482 */
483 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ },
484 /*
485 * COOKIE ACK from server, this is what we are awaiting,lets move to
486 * ESTABLISHED.
487 */
488 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ },
489 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ },
490 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ },
491 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ },
492 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ },
493 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ },
494 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ },
495 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ },
496 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ }
497 },
498 /*
499 * State : IP_VS_SCTP_S_ECHO_SER
500 * Server sent ECHO and waiting COOKEI ACK from the client
501 */
502 {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ },
503 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ },
504 /*
505 * We have got an INIT from client. From the spec.“Upon receipt of
506 * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with
507 * an INIT ACK using the same parameters it sent in its original
508 * INIT chunk (including its Initiate Tag, unchanged”).
509 */
510 {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ },
511 {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ },
512 /*
513 * INIT_ACK sent by the server, Unexpected INIT ACK, spec says,
514 * “If an INIT ACK is received by an endpoint in any state other
515 * than the COOKIE-WAIT state, the endpoint should discard the
516 * INIT ACK chunk”. Stay in the same state
517 */
518 {IP_VS_SCTP_S_ECHO_SER /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ },
519 /*
520 * INIT_ACK has been by the server, let us close the connection
521 */
522 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ },
523 /*
524 * Client sent the ECHO, not sure what to do, let's close the
525 * connection.
526 */
527 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ },
528 /*
529 * ECHO resent by the server, stay in the same state
530 */
531 {IP_VS_SCTP_S_ECHO_SER /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ },
532 /*
533 * COOKIE ACK from client, this is what we are expecting, let's move
534 * to ESTABLISHED.
535 */
536 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ },
537 /*
538 * COOKIE ACK from server, this should not happen, lets close the
539 * connection.
540 */
541 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ },
542 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ },
543 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ },
544 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ },
545 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ },
546 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ },
547 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ },
548 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ },
549 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ }
550 },
551 /*
552 * State : IP_VS_SCTP_S_ESTABLISHED
553 * Association established
554 */
555 {{IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_DATA_CLI */ },
556 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_DATA_SER */ },
557 /*
558 * We have got an INIT from client. From the spec.“Upon receipt of
559 * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with
560 * an INIT ACK using the same parameters it sent in its original
561 * INIT chunk (including its Initiate Tag, unchanged”).
562 */
563 {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ },
564 {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ },
565 /*
566 * INIT_ACK sent by the server, Unexpected INIT ACK, spec says,
567 * “If an INIT ACK is received by an endpoint in any state other
568 * than the COOKIE-WAIT state, the endpoint should discard the
569 * INIT ACK chunk”. Stay in the same state
570 */
571 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ },
572 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ },
573 /*
574 * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the
575 * peer and peer shall move to the ESTABISHED. if it doesn't handle
576 * it will send ERROR chunk. So, stay in the same state
577 */
578 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ },
579 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ },
580 /*
581 * COOKIE ACK from client, not sure what to do stay in the same state
582 */
583 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ },
584 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ },
585 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ },
586 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ },
587 /*
588 * SHUTDOWN from the client, move to SHUDDOWN_CLI
589 */
590 {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ },
591 /*
592 * SHUTDOWN from the server, move to SHUTDOWN_SER
593 */
594 {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ },
595 /*
596 * client sent SHUDTDOWN_ACK, this should not happen, let's close
597 * the connection
598 */
599 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ },
600 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ },
601 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ },
602 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ }
603 },
604 /*
605 * State : IP_VS_SCTP_S_SHUT_CLI
606 * SHUTDOWN sent from the client, waitinf for SHUT ACK from the server
607 */
608 /*
609 * We recieved the data chuck, keep the state unchanged. I assume
610 * that still data chuncks can be received by both the peers in
611 * SHUDOWN state
612 */
613
614 {{IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_DATA_CLI */ },
615 {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_DATA_SER */ },
616 /*
617 * We have got an INIT from client. From the spec.“Upon receipt of
618 * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with
619 * an INIT ACK using the same parameters it sent in its original
620 * INIT chunk (including its Initiate Tag, unchanged”).
621 */
622 {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ },
623 {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ },
624 /*
625 * INIT_ACK sent by the server, Unexpected INIT ACK, spec says,
626 * “If an INIT ACK is received by an endpoint in any state other
627 * than the COOKIE-WAIT state, the endpoint should discard the
628 * INIT ACK chunk”. Stay in the same state
629 */
630 {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ },
631 {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_INIT_ACK_SER */ },
632 /*
633 * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the
634 * peer and peer shall move to the ESTABISHED. if it doesn't handle
635 * it will send ERROR chunk. So, stay in the same state
636 */
637 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ },
638 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ },
639 /*
640 * COOKIE ACK from client, not sure what to do stay in the same state
641 */
642 {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ },
643 {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ },
644 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ },
645 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ },
646 /*
647 * SHUTDOWN resent from the client, move to SHUDDOWN_CLI
648 */
649 {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ },
650 /*
651 * SHUTDOWN from the server, move to SHUTDOWN_SER
652 */
653 {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ },
654 /*
655 * client sent SHUDTDOWN_ACK, this should not happen, let's close
656 * the connection
657 */
658 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ },
659 /*
660 * Server sent SHUTDOWN ACK, this is what we are expecting, let's move
661 * to SHUDOWN_ACK_SER
662 */
663 {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ },
664 /*
665 * SHUTDOWN COM from client, this should not happen, let's close the
666 * connection
667 */
668 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ },
669 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ }
670 },
671 /*
672 * State : IP_VS_SCTP_S_SHUT_SER
673 * SHUTDOWN sent from the server, waitinf for SHUTDOWN ACK from client
674 */
675 /*
676 * We recieved the data chuck, keep the state unchanged. I assume
677 * that still data chuncks can be received by both the peers in
678 * SHUDOWN state
679 */
680
681 {{IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_DATA_CLI */ },
682 {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_DATA_SER */ },
683 /*
684 * We have got an INIT from client. From the spec.“Upon receipt of
685 * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with
686 * an INIT ACK using the same parameters it sent in its original
687 * INIT chunk (including its Initiate Tag, unchanged”).
688 */
689 {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ },
690 {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ },
691 /*
692 * INIT_ACK sent by the server, Unexpected INIT ACK, spec says,
693 * “If an INIT ACK is received by an endpoint in any state other
694 * than the COOKIE-WAIT state, the endpoint should discard the
695 * INIT ACK chunk”. Stay in the same state
696 */
697 {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ },
698 {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_INIT_ACK_SER */ },
699 /*
700 * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the
701 * peer and peer shall move to the ESTABISHED. if it doesn't handle
702 * it will send ERROR chunk. So, stay in the same state
703 */
704 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ },
705 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ },
706 /*
707 * COOKIE ACK from client, not sure what to do stay in the same state
708 */
709 {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ },
710 {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ },
711 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ },
712 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ },
713 /*
714 * SHUTDOWN resent from the client, move to SHUDDOWN_CLI
715 */
716 {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ },
717 /*
718 * SHUTDOWN resent from the server, move to SHUTDOWN_SER
719 */
720 {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ },
721 /*
722 * client sent SHUDTDOWN_ACK, this is what we are expecting, let's
723 * move to SHUT_ACK_CLI
724 */
725 {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ },
726 /*
727 * Server sent SHUTDOWN ACK, this should not happen, let's close the
728 * connection
729 */
730 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ },
731 /*
732 * SHUTDOWN COM from client, this should not happen, let's close the
733 * connection
734 */
735 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ },
736 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ }
737 },
738
739 /*
740 * State : IP_VS_SCTP_S_SHUT_ACK_CLI
741 * SHUTDOWN ACK from the client, awaiting for SHUTDOWN COM from server
742 */
743 /*
744 * We recieved the data chuck, keep the state unchanged. I assume
745 * that still data chuncks can be received by both the peers in
746 * SHUDOWN state
747 */
748
749 {{IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_DATA_CLI */ },
750 {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_DATA_SER */ },
751 /*
752 * We have got an INIT from client. From the spec.“Upon receipt of
753 * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with
754 * an INIT ACK using the same parameters it sent in its original
755 * INIT chunk (including its Initiate Tag, unchanged”).
756 */
757 {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ },
758 {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ },
759 /*
760 * INIT_ACK sent by the server, Unexpected INIT ACK, spec says,
761 * “If an INIT ACK is received by an endpoint in any state other
762 * than the COOKIE-WAIT state, the endpoint should discard the
763 * INIT ACK chunk”. Stay in the same state
764 */
765 {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ },
766 {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_INIT_ACK_SER */ },
767 /*
768 * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the
769 * peer and peer shall move to the ESTABISHED. if it doesn't handle
770 * it will send ERROR chunk. So, stay in the same state
771 */
772 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ },
773 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ },
774 /*
775 * COOKIE ACK from client, not sure what to do stay in the same state
776 */
777 {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ },
778 {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ },
779 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ },
780 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ },
781 /*
782 * SHUTDOWN sent from the client, move to SHUDDOWN_CLI
783 */
784 {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ },
785 /*
786 * SHUTDOWN sent from the server, move to SHUTDOWN_SER
787 */
788 {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ },
789 /*
790 * client resent SHUDTDOWN_ACK, let's stay in the same state
791 */
792 {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ },
793 /*
794 * Server sent SHUTDOWN ACK, this should not happen, let's close the
795 * connection
796 */
797 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ },
798 /*
799 * SHUTDOWN COM from client, this should not happen, let's close the
800 * connection
801 */
802 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ },
803 /*
804 * SHUTDOWN COMPLETE from server this is what we are expecting.
805 */
806 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ }
807 },
808
809 /*
810 * State : IP_VS_SCTP_S_SHUT_ACK_SER
811 * SHUTDOWN ACK from the server, awaiting for SHUTDOWN COM from client
812 */
813 /*
814 * We recieved the data chuck, keep the state unchanged. I assume
815 * that still data chuncks can be received by both the peers in
816 * SHUDOWN state
817 */
818
819 {{IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_DATA_CLI */ },
820 {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_DATA_SER */ },
821 /*
822 * We have got an INIT from client. From the spec.“Upon receipt of
823 * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with
824 * an INIT ACK using the same parameters it sent in its original
825 * INIT chunk (including its Initiate Tag, unchanged”).
826 */
827 {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ },
828 {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ },
829 /*
830 * INIT_ACK sent by the server, Unexpected INIT ACK, spec says,
831 * “If an INIT ACK is received by an endpoint in any state other
832 * than the COOKIE-WAIT state, the endpoint should discard the
833 * INIT ACK chunk”. Stay in the same state
834 */
835 {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ },
836 {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_INIT_ACK_SER */ },
837 /*
838 * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the
839 * peer and peer shall move to the ESTABISHED. if it doesn't handle
840 * it will send ERROR chunk. So, stay in the same state
841 */
842 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ },
843 {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ },
844 /*
845 * COOKIE ACK from client, not sure what to do stay in the same state
846 */
847 {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ },
848 {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ },
849 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ },
850 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ },
851 /*
852 * SHUTDOWN sent from the client, move to SHUDDOWN_CLI
853 */
854 {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ },
855 /*
856 * SHUTDOWN sent from the server, move to SHUTDOWN_SER
857 */
858 {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ },
859 /*
860 * client sent SHUDTDOWN_ACK, this should not happen let's close
861 * the connection.
862 */
863 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ },
864 /*
865 * Server resent SHUTDOWN ACK, stay in the same state
866 */
867 {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ },
868 /*
869 * SHUTDOWN COM from client, this what we are expecting, let's close
870 * the connection
871 */
872 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ },
873 /*
874 * SHUTDOWN COMPLETE from server this should not happen.
875 */
876 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ }
877 },
878 /*
879 * State : IP_VS_SCTP_S_CLOSED
880 */
881 {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ },
882 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ },
883 {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ },
884 {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ },
885 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ },
886 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ },
887 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ },
888 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ },
889 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ },
890 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ },
891 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ },
892 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ },
893 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ },
894 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ },
895 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ },
896 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ },
897 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ },
898 {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ }
899 }
900};
901
902/*
903 * Timeout table[state]
904 */
905static int sctp_timeouts[IP_VS_SCTP_S_LAST + 1] = {
906 [IP_VS_SCTP_S_NONE] = 2 * HZ,
907 [IP_VS_SCTP_S_INIT_CLI] = 1 * 60 * HZ,
908 [IP_VS_SCTP_S_INIT_SER] = 1 * 60 * HZ,
909 [IP_VS_SCTP_S_INIT_ACK_CLI] = 1 * 60 * HZ,
910 [IP_VS_SCTP_S_INIT_ACK_SER] = 1 * 60 * HZ,
911 [IP_VS_SCTP_S_ECHO_CLI] = 1 * 60 * HZ,
912 [IP_VS_SCTP_S_ECHO_SER] = 1 * 60 * HZ,
913 [IP_VS_SCTP_S_ESTABLISHED] = 15 * 60 * HZ,
914 [IP_VS_SCTP_S_SHUT_CLI] = 1 * 60 * HZ,
915 [IP_VS_SCTP_S_SHUT_SER] = 1 * 60 * HZ,
916 [IP_VS_SCTP_S_SHUT_ACK_CLI] = 1 * 60 * HZ,
917 [IP_VS_SCTP_S_SHUT_ACK_SER] = 1 * 60 * HZ,
918 [IP_VS_SCTP_S_CLOSED] = 10 * HZ,
919 [IP_VS_SCTP_S_LAST] = 2 * HZ,
920};
921
922static const char *sctp_state_name_table[IP_VS_SCTP_S_LAST + 1] = {
923 [IP_VS_SCTP_S_NONE] = "NONE",
924 [IP_VS_SCTP_S_INIT_CLI] = "INIT_CLI",
925 [IP_VS_SCTP_S_INIT_SER] = "INIT_SER",
926 [IP_VS_SCTP_S_INIT_ACK_CLI] = "INIT_ACK_CLI",
927 [IP_VS_SCTP_S_INIT_ACK_SER] = "INIT_ACK_SER",
928 [IP_VS_SCTP_S_ECHO_CLI] = "COOKIE_ECHO_CLI",
929 [IP_VS_SCTP_S_ECHO_SER] = "COOKIE_ECHO_SER",
930 [IP_VS_SCTP_S_ESTABLISHED] = "ESTABISHED",
931 [IP_VS_SCTP_S_SHUT_CLI] = "SHUTDOWN_CLI",
932 [IP_VS_SCTP_S_SHUT_SER] = "SHUTDOWN_SER",
933 [IP_VS_SCTP_S_SHUT_ACK_CLI] = "SHUTDOWN_ACK_CLI",
934 [IP_VS_SCTP_S_SHUT_ACK_SER] = "SHUTDOWN_ACK_SER",
935 [IP_VS_SCTP_S_CLOSED] = "CLOSED",
936 [IP_VS_SCTP_S_LAST] = "BUG!"
937};
938
939
940static const char *sctp_state_name(int state)
941{
942 if (state >= IP_VS_SCTP_S_LAST)
943 return "ERR!";
944 if (sctp_state_name_table[state])
945 return sctp_state_name_table[state];
946 return "?";
947}
948
949static void sctp_timeout_change(struct ip_vs_protocol *pp, int flags)
950{
951}
952
953static int
954sctp_set_state_timeout(struct ip_vs_protocol *pp, char *sname, int to)
955{
956
957return ip_vs_set_state_timeout(pp->timeout_table, IP_VS_SCTP_S_LAST,
958 sctp_state_name_table, sname, to);
959}
960
961static inline int
962set_sctp_state(struct ip_vs_protocol *pp, struct ip_vs_conn *cp,
963 int direction, const struct sk_buff *skb)
964{
965 sctp_chunkhdr_t _sctpch, *sch;
966 unsigned char chunk_type;
967 int event, next_state;
968 int ihl;
969
970#ifdef CONFIG_IP_VS_IPV6
971 ihl = cp->af == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr);
972#else
973 ihl = ip_hdrlen(skb);
974#endif
975
976 sch = skb_header_pointer(skb, ihl + sizeof(sctp_sctphdr_t),
977 sizeof(_sctpch), &_sctpch);
978 if (sch == NULL)
979 return 0;
980
981 chunk_type = sch->type;
982 /*
983 * Section 3: Multiple chunks can be bundled into one SCTP packet
984 * up to the MTU size, except for the INIT, INIT ACK, and
985 * SHUTDOWN COMPLETE chunks. These chunks MUST NOT be bundled with
986 * any other chunk in a packet.
987 *
988 * Section 3.3.7: DATA chunks MUST NOT be bundled with ABORT. Control
989 * chunks (except for INIT, INIT ACK, and SHUTDOWN COMPLETE) MAY be
990 * bundled with an ABORT, but they MUST be placed before the ABORT
991 * in the SCTP packet or they will be ignored by the receiver.
992 */
993 if ((sch->type == SCTP_CID_COOKIE_ECHO) ||
994 (sch->type == SCTP_CID_COOKIE_ACK)) {
995 sch = skb_header_pointer(skb, (ihl + sizeof(sctp_sctphdr_t) +
996 sch->length), sizeof(_sctpch), &_sctpch);
997 if (sch) {
998 if (sch->type == SCTP_CID_ABORT)
999 chunk_type = sch->type;
1000 }
1001 }
1002
1003 event = sctp_events[chunk_type];
1004
1005 /*
1006 * If the direction is IP_VS_DIR_OUTPUT, this event is from server
1007 */
1008 if (direction == IP_VS_DIR_OUTPUT)
1009 event++;
1010 /*
1011 * get next state
1012 */
1013 next_state = sctp_states_table[cp->state][event].next_state;
1014
1015 if (next_state != cp->state) {
1016 struct ip_vs_dest *dest = cp->dest;
1017
1018 IP_VS_DBG_BUF(8, "%s %s %s:%d->"
1019 "%s:%d state: %s->%s conn->refcnt:%d\n",
1020 pp->name,
1021 ((direction == IP_VS_DIR_OUTPUT) ?
1022 "output " : "input "),
1023 IP_VS_DBG_ADDR(cp->af, &cp->daddr),
1024 ntohs(cp->dport),
1025 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1026 ntohs(cp->cport),
1027 sctp_state_name(cp->state),
1028 sctp_state_name(next_state),
1029 atomic_read(&cp->refcnt));
1030 if (dest) {
1031 if (!(cp->flags & IP_VS_CONN_F_INACTIVE) &&
1032 (next_state != IP_VS_SCTP_S_ESTABLISHED)) {
1033 atomic_dec(&dest->activeconns);
1034 atomic_inc(&dest->inactconns);
1035 cp->flags |= IP_VS_CONN_F_INACTIVE;
1036 } else if ((cp->flags & IP_VS_CONN_F_INACTIVE) &&
1037 (next_state == IP_VS_SCTP_S_ESTABLISHED)) {
1038 atomic_inc(&dest->activeconns);
1039 atomic_dec(&dest->inactconns);
1040 cp->flags &= ~IP_VS_CONN_F_INACTIVE;
1041 }
1042 }
1043 }
1044
1045 cp->timeout = pp->timeout_table[cp->state = next_state];
1046
1047 return 1;
1048}
1049
1050static int
1051sctp_state_transition(struct ip_vs_conn *cp, int direction,
1052 const struct sk_buff *skb, struct ip_vs_protocol *pp)
1053{
1054 int ret = 0;
1055
1056 spin_lock(&cp->lock);
1057 ret = set_sctp_state(pp, cp, direction, skb);
1058 spin_unlock(&cp->lock);
1059
1060 return ret;
1061}
1062
1063/*
1064 * Hash table for SCTP application incarnations
1065 */
1066#define SCTP_APP_TAB_BITS 4
1067#define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
1068#define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
1069
1070static struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
1071static DEFINE_SPINLOCK(sctp_app_lock);
1072
1073static inline __u16 sctp_app_hashkey(__be16 port)
1074{
1075 return (((__force u16)port >> SCTP_APP_TAB_BITS) ^ (__force u16)port)
1076 & SCTP_APP_TAB_MASK;
1077}
1078
1079static int sctp_register_app(struct ip_vs_app *inc)
1080{
1081 struct ip_vs_app *i;
1082 __u16 hash;
1083 __be16 port = inc->port;
1084 int ret = 0;
1085
1086 hash = sctp_app_hashkey(port);
1087
1088 spin_lock_bh(&sctp_app_lock);
1089 list_for_each_entry(i, &sctp_apps[hash], p_list) {
1090 if (i->port == port) {
1091 ret = -EEXIST;
1092 goto out;
1093 }
1094 }
1095 list_add(&inc->p_list, &sctp_apps[hash]);
1096 atomic_inc(&ip_vs_protocol_sctp.appcnt);
1097out:
1098 spin_unlock_bh(&sctp_app_lock);
1099
1100 return ret;
1101}
1102
1103static void sctp_unregister_app(struct ip_vs_app *inc)
1104{
1105 spin_lock_bh(&sctp_app_lock);
1106 atomic_dec(&ip_vs_protocol_sctp.appcnt);
1107 list_del(&inc->p_list);
1108 spin_unlock_bh(&sctp_app_lock);
1109}
1110
1111static int sctp_app_conn_bind(struct ip_vs_conn *cp)
1112{
1113 int hash;
1114 struct ip_vs_app *inc;
1115 int result = 0;
1116
1117 /* Default binding: bind app only for NAT */
1118 if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
1119 return 0;
1120 /* Lookup application incarnations and bind the right one */
1121 hash = sctp_app_hashkey(cp->vport);
1122
1123 spin_lock(&sctp_app_lock);
1124 list_for_each_entry(inc, &sctp_apps[hash], p_list) {
1125 if (inc->port == cp->vport) {
1126 if (unlikely(!ip_vs_app_inc_get(inc)))
1127 break;
1128 spin_unlock(&sctp_app_lock);
1129
1130 IP_VS_DBG_BUF(9, "%s: Binding conn %s:%u->"
1131 "%s:%u to app %s on port %u\n",
1132 __func__,
1133 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1134 ntohs(cp->cport),
1135 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1136 ntohs(cp->vport),
1137 inc->name, ntohs(inc->port));
1138 cp->app = inc;
1139 if (inc->init_conn)
1140 result = inc->init_conn(inc, cp);
1141 goto out;
1142 }
1143 }
1144 spin_unlock(&sctp_app_lock);
1145out:
1146 return result;
1147}
1148
1149static void ip_vs_sctp_init(struct ip_vs_protocol *pp)
1150{
1151 IP_VS_INIT_HASH_TABLE(sctp_apps);
1152 pp->timeout_table = sctp_timeouts;
1153}
1154
1155
1156static void ip_vs_sctp_exit(struct ip_vs_protocol *pp)
1157{
1158
1159}
1160
1161struct ip_vs_protocol ip_vs_protocol_sctp = {
1162 .name = "SCTP",
1163 .protocol = IPPROTO_SCTP,
1164 .num_states = IP_VS_SCTP_S_LAST,
1165 .dont_defrag = 0,
1166 .appcnt = ATOMIC_INIT(0),
1167 .init = ip_vs_sctp_init,
1168 .exit = ip_vs_sctp_exit,
1169 .register_app = sctp_register_app,
1170 .unregister_app = sctp_unregister_app,
1171 .conn_schedule = sctp_conn_schedule,
1172 .conn_in_get = sctp_conn_in_get,
1173 .conn_out_get = sctp_conn_out_get,
1174 .snat_handler = sctp_snat_handler,
1175 .dnat_handler = sctp_dnat_handler,
1176 .csum_check = sctp_csum_check,
1177 .state_name = sctp_state_name,
1178 .state_transition = sctp_state_transition,
1179 .app_conn_bind = sctp_app_conn_bind,
1180 .debug_packet = ip_vs_tcpudp_debug_packet,
1181 .timeout_change = sctp_timeout_change,
1182 .set_state_timeout = sctp_set_state_timeout,
1183};
Linux 6.x block layer and io_uring tree(s)