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28#include <linux/types.h>
29#include <linux/compiler.h>
30#include <linux/slab.h>
31#include <linux/in.h>
32#include <net/sctp/command.h>
33#include <net/sctp/sctp.h>
34
35#ifndef __sctp_sm_h__
36#define __sctp_sm_h__
37
38
39
40
41enum sctp_disposition {
42 SCTP_DISPOSITION_DISCARD,
43 SCTP_DISPOSITION_CONSUME,
44 SCTP_DISPOSITION_NOMEM,
45 SCTP_DISPOSITION_DELETE_TCB,
46 SCTP_DISPOSITION_ABORT,
47 SCTP_DISPOSITION_VIOLATION,
48 SCTP_DISPOSITION_NOT_IMPL,
49 SCTP_DISPOSITION_ERROR,
50 SCTP_DISPOSITION_BUG,
51};
52
53typedef enum sctp_disposition (sctp_state_fn_t) (
54 struct net *net,
55 const struct sctp_endpoint *ep,
56 const struct sctp_association *asoc,
57 const union sctp_subtype type,
58 void *arg,
59 struct sctp_cmd_seq *commands);
60typedef void (sctp_timer_event_t) (struct timer_list *);
61struct sctp_sm_table_entry {
62 sctp_state_fn_t *fn;
63 const char *name;
64};
65
66
67
68
69
70
71sctp_state_fn_t sctp_sf_not_impl;
72sctp_state_fn_t sctp_sf_bug;
73
74
75sctp_state_fn_t sctp_sf_timer_ignore;
76
77
78sctp_state_fn_t sctp_sf_do_9_1_abort;
79sctp_state_fn_t sctp_sf_cookie_wait_abort;
80sctp_state_fn_t sctp_sf_cookie_echoed_abort;
81sctp_state_fn_t sctp_sf_shutdown_pending_abort;
82sctp_state_fn_t sctp_sf_shutdown_sent_abort;
83sctp_state_fn_t sctp_sf_shutdown_ack_sent_abort;
84sctp_state_fn_t sctp_sf_do_5_1B_init;
85sctp_state_fn_t sctp_sf_do_5_1C_ack;
86sctp_state_fn_t sctp_sf_do_5_1D_ce;
87sctp_state_fn_t sctp_sf_do_5_1E_ca;
88sctp_state_fn_t sctp_sf_do_4_C;
89sctp_state_fn_t sctp_sf_eat_data_6_2;
90sctp_state_fn_t sctp_sf_eat_data_fast_4_4;
91sctp_state_fn_t sctp_sf_eat_sack_6_2;
92sctp_state_fn_t sctp_sf_operr_notify;
93sctp_state_fn_t sctp_sf_t1_init_timer_expire;
94sctp_state_fn_t sctp_sf_t1_cookie_timer_expire;
95sctp_state_fn_t sctp_sf_t2_timer_expire;
96sctp_state_fn_t sctp_sf_t4_timer_expire;
97sctp_state_fn_t sctp_sf_t5_timer_expire;
98sctp_state_fn_t sctp_sf_sendbeat_8_3;
99sctp_state_fn_t sctp_sf_beat_8_3;
100sctp_state_fn_t sctp_sf_backbeat_8_3;
101sctp_state_fn_t sctp_sf_do_9_2_final;
102sctp_state_fn_t sctp_sf_do_9_2_shutdown;
103sctp_state_fn_t sctp_sf_do_9_2_shut_ctsn;
104sctp_state_fn_t sctp_sf_do_ecn_cwr;
105sctp_state_fn_t sctp_sf_do_ecne;
106sctp_state_fn_t sctp_sf_ootb;
107sctp_state_fn_t sctp_sf_pdiscard;
108sctp_state_fn_t sctp_sf_violation;
109sctp_state_fn_t sctp_sf_discard_chunk;
110sctp_state_fn_t sctp_sf_do_5_2_1_siminit;
111sctp_state_fn_t sctp_sf_do_5_2_2_dupinit;
112sctp_state_fn_t sctp_sf_do_5_2_3_initack;
113sctp_state_fn_t sctp_sf_do_5_2_4_dupcook;
114sctp_state_fn_t sctp_sf_unk_chunk;
115sctp_state_fn_t sctp_sf_do_8_5_1_E_sa;
116sctp_state_fn_t sctp_sf_cookie_echoed_err;
117sctp_state_fn_t sctp_sf_do_asconf;
118sctp_state_fn_t sctp_sf_do_asconf_ack;
119sctp_state_fn_t sctp_sf_do_reconf;
120sctp_state_fn_t sctp_sf_do_9_2_reshutack;
121sctp_state_fn_t sctp_sf_eat_fwd_tsn;
122sctp_state_fn_t sctp_sf_eat_fwd_tsn_fast;
123sctp_state_fn_t sctp_sf_eat_auth;
124
125
126sctp_state_fn_t sctp_sf_do_prm_asoc;
127sctp_state_fn_t sctp_sf_do_prm_send;
128sctp_state_fn_t sctp_sf_do_9_2_prm_shutdown;
129sctp_state_fn_t sctp_sf_cookie_wait_prm_shutdown;
130sctp_state_fn_t sctp_sf_cookie_echoed_prm_shutdown;
131sctp_state_fn_t sctp_sf_do_9_1_prm_abort;
132sctp_state_fn_t sctp_sf_cookie_wait_prm_abort;
133sctp_state_fn_t sctp_sf_cookie_echoed_prm_abort;
134sctp_state_fn_t sctp_sf_shutdown_pending_prm_abort;
135sctp_state_fn_t sctp_sf_shutdown_sent_prm_abort;
136sctp_state_fn_t sctp_sf_shutdown_ack_sent_prm_abort;
137sctp_state_fn_t sctp_sf_error_closed;
138sctp_state_fn_t sctp_sf_error_shutdown;
139sctp_state_fn_t sctp_sf_ignore_primitive;
140sctp_state_fn_t sctp_sf_do_prm_requestheartbeat;
141sctp_state_fn_t sctp_sf_do_prm_asconf;
142sctp_state_fn_t sctp_sf_do_prm_reconf;
143
144
145sctp_state_fn_t sctp_sf_do_no_pending_tsn;
146sctp_state_fn_t sctp_sf_do_9_2_start_shutdown;
147sctp_state_fn_t sctp_sf_do_9_2_shutdown_ack;
148sctp_state_fn_t sctp_sf_ignore_other;
149sctp_state_fn_t sctp_sf_cookie_wait_icmp_abort;
150
151
152sctp_state_fn_t sctp_sf_do_6_3_3_rtx;
153sctp_state_fn_t sctp_sf_send_reconf;
154sctp_state_fn_t sctp_sf_do_6_2_sack;
155sctp_state_fn_t sctp_sf_autoclose_timer_expire;
156
157
158__u8 sctp_get_chunk_type(struct sctp_chunk *chunk);
159const struct sctp_sm_table_entry *sctp_sm_lookup_event(
160 struct net *net,
161 enum sctp_event_type event_type,
162 enum sctp_state state,
163 union sctp_subtype event_subtype);
164int sctp_chunk_iif(const struct sctp_chunk *);
165struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *,
166 struct sctp_chunk *,
167 gfp_t gfp);
168__u32 sctp_generate_verification_tag(void);
169void sctp_populate_tie_tags(__u8 *cookie, __u32 curTag, __u32 hisTag);
170
171
172struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
173 const struct sctp_bind_addr *bp,
174 gfp_t gfp, int vparam_len);
175struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
176 const struct sctp_chunk *chunk,
177 const gfp_t gfp, const int unkparam_len);
178struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
179 const struct sctp_chunk *chunk);
180struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
181 const struct sctp_chunk *chunk);
182struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
183 const __u32 lowest_tsn,
184 const struct sctp_chunk *chunk);
185struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc,
186 __u8 flags, int paylen, gfp_t gfp);
187struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc,
188 __u32 new_cum_tsn, size_t nstreams,
189 struct sctp_ifwdtsn_skip *skiplist);
190struct sctp_chunk *sctp_make_datafrag_empty(const struct sctp_association *asoc,
191 const struct sctp_sndrcvinfo *sinfo,
192 int len, __u8 flags, gfp_t gfp);
193struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
194 const __u32 lowest_tsn);
195struct sctp_chunk *sctp_make_sack(struct sctp_association *asoc);
196struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
197 const struct sctp_chunk *chunk);
198struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
199 const struct sctp_chunk *chunk);
200struct sctp_chunk *sctp_make_shutdown_complete(
201 const struct sctp_association *asoc,
202 const struct sctp_chunk *chunk);
203int sctp_init_cause(struct sctp_chunk *chunk, __be16 cause, size_t paylen);
204struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
205 const struct sctp_chunk *chunk,
206 const size_t hint);
207struct sctp_chunk *sctp_make_abort_no_data(const struct sctp_association *asoc,
208 const struct sctp_chunk *chunk,
209 __u32 tsn);
210struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
211 struct msghdr *msg, size_t msg_len);
212struct sctp_chunk *sctp_make_abort_violation(
213 const struct sctp_association *asoc,
214 const struct sctp_chunk *chunk,
215 const __u8 *payload,
216 const size_t paylen);
217struct sctp_chunk *sctp_make_violation_paramlen(
218 const struct sctp_association *asoc,
219 const struct sctp_chunk *chunk,
220 struct sctp_paramhdr *param);
221struct sctp_chunk *sctp_make_violation_max_retrans(
222 const struct sctp_association *asoc,
223 const struct sctp_chunk *chunk);
224struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
225 const struct sctp_transport *transport);
226struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
227 const struct sctp_chunk *chunk,
228 const void *payload,
229 const size_t paylen);
230struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
231 const struct sctp_chunk *chunk,
232 __be16 cause_code, const void *payload,
233 size_t paylen, size_t reserve_tail);
234
235struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
236 union sctp_addr *laddr,
237 struct sockaddr *addrs,
238 int addrcnt, __be16 flags);
239struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
240 union sctp_addr *addr);
241bool sctp_verify_asconf(const struct sctp_association *asoc,
242 struct sctp_chunk *chunk, bool addr_param_needed,
243 struct sctp_paramhdr **errp);
244struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
245 struct sctp_chunk *asconf);
246int sctp_process_asconf_ack(struct sctp_association *asoc,
247 struct sctp_chunk *asconf_ack);
248struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
249 __u32 new_cum_tsn, size_t nstreams,
250 struct sctp_fwdtsn_skip *skiplist);
251struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc,
252 __u16 key_id);
253struct sctp_chunk *sctp_make_strreset_req(const struct sctp_association *asoc,
254 __u16 stream_num, __be16 *stream_list,
255 bool out, bool in);
256struct sctp_chunk *sctp_make_strreset_tsnreq(
257 const struct sctp_association *asoc);
258struct sctp_chunk *sctp_make_strreset_addstrm(
259 const struct sctp_association *asoc,
260 __u16 out, __u16 in);
261struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc,
262 __u32 result, __u32 sn);
263struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc,
264 __u32 result, __u32 sn,
265 __u32 sender_tsn,
266 __u32 receiver_tsn);
267bool sctp_verify_reconf(const struct sctp_association *asoc,
268 struct sctp_chunk *chunk,
269 struct sctp_paramhdr **errp);
270void sctp_chunk_assign_tsn(struct sctp_chunk *chunk);
271void sctp_chunk_assign_ssn(struct sctp_chunk *chunk);
272
273
274struct sctp_chunk *sctp_process_strreset_outreq(
275 struct sctp_association *asoc,
276 union sctp_params param,
277 struct sctp_ulpevent **evp);
278struct sctp_chunk *sctp_process_strreset_inreq(
279 struct sctp_association *asoc,
280 union sctp_params param,
281 struct sctp_ulpevent **evp);
282struct sctp_chunk *sctp_process_strreset_tsnreq(
283 struct sctp_association *asoc,
284 union sctp_params param,
285 struct sctp_ulpevent **evp);
286struct sctp_chunk *sctp_process_strreset_addstrm_out(
287 struct sctp_association *asoc,
288 union sctp_params param,
289 struct sctp_ulpevent **evp);
290struct sctp_chunk *sctp_process_strreset_addstrm_in(
291 struct sctp_association *asoc,
292 union sctp_params param,
293 struct sctp_ulpevent **evp);
294struct sctp_chunk *sctp_process_strreset_resp(
295 struct sctp_association *asoc,
296 union sctp_params param,
297 struct sctp_ulpevent **evp);
298
299
300
301int sctp_do_sm(struct net *net, enum sctp_event_type event_type,
302 union sctp_subtype subtype, enum sctp_state state,
303 struct sctp_endpoint *ep, struct sctp_association *asoc,
304 void *event_arg, gfp_t gfp);
305
306
307void sctp_generate_t3_rtx_event(struct timer_list *t);
308void sctp_generate_heartbeat_event(struct timer_list *t);
309void sctp_generate_reconf_event(struct timer_list *t);
310void sctp_generate_proto_unreach_event(struct timer_list *t);
311
312void sctp_ootb_pkt_free(struct sctp_packet *packet);
313
314struct sctp_association *sctp_unpack_cookie(
315 const struct sctp_endpoint *ep,
316 const struct sctp_association *asoc,
317 struct sctp_chunk *chunk,
318 gfp_t gfp, int *err,
319 struct sctp_chunk **err_chk_p);
320
321
322__u32 sctp_generate_tag(const struct sctp_endpoint *ep);
323__u32 sctp_generate_tsn(const struct sctp_endpoint *ep);
324
325
326extern sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES];
327
328
329
330static inline __u16 sctp_data_size(struct sctp_chunk *chunk)
331{
332 __u16 size;
333
334 size = ntohs(chunk->chunk_hdr->length);
335 size -= sctp_datachk_len(&chunk->asoc->stream);
336
337 return size;
338}
339
340
341#define TSN_lt(a,b) \
342 (typecheck(__u32, a) && \
343 typecheck(__u32, b) && \
344 ((__s32)((a) - (b)) < 0))
345
346#define TSN_lte(a,b) \
347 (typecheck(__u32, a) && \
348 typecheck(__u32, b) && \
349 ((__s32)((a) - (b)) <= 0))
350
351
352#define MID_lt(a, b) \
353 (typecheck(__u32, a) && \
354 typecheck(__u32, b) && \
355 ((__s32)((a) - (b)) < 0))
356
357
358#define SSN_lt(a,b) \
359 (typecheck(__u16, a) && \
360 typecheck(__u16, b) && \
361 ((__s16)((a) - (b)) < 0))
362
363
364#define ADDIP_SERIAL_gte(a,b) \
365 (typecheck(__u32, a) && \
366 typecheck(__u32, b) && \
367 ((__s32)((b) - (a)) <= 0))
368
369
370static inline int
371sctp_vtag_verify(const struct sctp_chunk *chunk,
372 const struct sctp_association *asoc)
373{
374
375
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378
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380 if (ntohl(chunk->sctp_hdr->vtag) == asoc->c.my_vtag)
381 return 1;
382
383 return 0;
384}
385
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388
389static inline int
390sctp_vtag_verify_either(const struct sctp_chunk *chunk,
391 const struct sctp_association *asoc)
392{
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414 if ((!sctp_test_T_bit(chunk) &&
415 (ntohl(chunk->sctp_hdr->vtag) == asoc->c.my_vtag)) ||
416 (sctp_test_T_bit(chunk) && asoc->c.peer_vtag &&
417 (ntohl(chunk->sctp_hdr->vtag) == asoc->c.peer_vtag))) {
418 return 1;
419 }
420
421 return 0;
422}
423
424#endif
425