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43#include <linux/types.h>
44#include <linux/compiler.h>
45#include <linux/slab.h>
46#include <linux/in.h>
47#include <net/sctp/command.h>
48#include <net/sctp/sctp.h>
49
50#ifndef __sctp_sm_h__
51#define __sctp_sm_h__
52
53
54
55
56enum sctp_disposition {
57 SCTP_DISPOSITION_DISCARD,
58 SCTP_DISPOSITION_CONSUME,
59 SCTP_DISPOSITION_NOMEM,
60 SCTP_DISPOSITION_DELETE_TCB,
61 SCTP_DISPOSITION_ABORT,
62 SCTP_DISPOSITION_VIOLATION,
63 SCTP_DISPOSITION_NOT_IMPL,
64 SCTP_DISPOSITION_ERROR,
65 SCTP_DISPOSITION_BUG,
66};
67
68typedef enum sctp_disposition (sctp_state_fn_t) (
69 struct net *net,
70 const struct sctp_endpoint *ep,
71 const struct sctp_association *asoc,
72 const union sctp_subtype type,
73 void *arg,
74 struct sctp_cmd_seq *commands);
75typedef void (sctp_timer_event_t) (unsigned long);
76struct sctp_sm_table_entry {
77 sctp_state_fn_t *fn;
78 const char *name;
79};
80
81
82
83
84
85
86sctp_state_fn_t sctp_sf_not_impl;
87sctp_state_fn_t sctp_sf_bug;
88
89
90sctp_state_fn_t sctp_sf_timer_ignore;
91
92
93sctp_state_fn_t sctp_sf_do_9_1_abort;
94sctp_state_fn_t sctp_sf_cookie_wait_abort;
95sctp_state_fn_t sctp_sf_cookie_echoed_abort;
96sctp_state_fn_t sctp_sf_shutdown_pending_abort;
97sctp_state_fn_t sctp_sf_shutdown_sent_abort;
98sctp_state_fn_t sctp_sf_shutdown_ack_sent_abort;
99sctp_state_fn_t sctp_sf_do_5_1B_init;
100sctp_state_fn_t sctp_sf_do_5_1C_ack;
101sctp_state_fn_t sctp_sf_do_5_1D_ce;
102sctp_state_fn_t sctp_sf_do_5_1E_ca;
103sctp_state_fn_t sctp_sf_do_4_C;
104sctp_state_fn_t sctp_sf_eat_data_6_2;
105sctp_state_fn_t sctp_sf_eat_data_fast_4_4;
106sctp_state_fn_t sctp_sf_eat_sack_6_2;
107sctp_state_fn_t sctp_sf_operr_notify;
108sctp_state_fn_t sctp_sf_t1_init_timer_expire;
109sctp_state_fn_t sctp_sf_t1_cookie_timer_expire;
110sctp_state_fn_t sctp_sf_t2_timer_expire;
111sctp_state_fn_t sctp_sf_t4_timer_expire;
112sctp_state_fn_t sctp_sf_t5_timer_expire;
113sctp_state_fn_t sctp_sf_sendbeat_8_3;
114sctp_state_fn_t sctp_sf_beat_8_3;
115sctp_state_fn_t sctp_sf_backbeat_8_3;
116sctp_state_fn_t sctp_sf_do_9_2_final;
117sctp_state_fn_t sctp_sf_do_9_2_shutdown;
118sctp_state_fn_t sctp_sf_do_9_2_shut_ctsn;
119sctp_state_fn_t sctp_sf_do_ecn_cwr;
120sctp_state_fn_t sctp_sf_do_ecne;
121sctp_state_fn_t sctp_sf_ootb;
122sctp_state_fn_t sctp_sf_pdiscard;
123sctp_state_fn_t sctp_sf_violation;
124sctp_state_fn_t sctp_sf_discard_chunk;
125sctp_state_fn_t sctp_sf_do_5_2_1_siminit;
126sctp_state_fn_t sctp_sf_do_5_2_2_dupinit;
127sctp_state_fn_t sctp_sf_do_5_2_3_initack;
128sctp_state_fn_t sctp_sf_do_5_2_4_dupcook;
129sctp_state_fn_t sctp_sf_unk_chunk;
130sctp_state_fn_t sctp_sf_do_8_5_1_E_sa;
131sctp_state_fn_t sctp_sf_cookie_echoed_err;
132sctp_state_fn_t sctp_sf_do_asconf;
133sctp_state_fn_t sctp_sf_do_asconf_ack;
134sctp_state_fn_t sctp_sf_do_reconf;
135sctp_state_fn_t sctp_sf_do_9_2_reshutack;
136sctp_state_fn_t sctp_sf_eat_fwd_tsn;
137sctp_state_fn_t sctp_sf_eat_fwd_tsn_fast;
138sctp_state_fn_t sctp_sf_eat_auth;
139
140
141sctp_state_fn_t sctp_sf_do_prm_asoc;
142sctp_state_fn_t sctp_sf_do_prm_send;
143sctp_state_fn_t sctp_sf_do_9_2_prm_shutdown;
144sctp_state_fn_t sctp_sf_cookie_wait_prm_shutdown;
145sctp_state_fn_t sctp_sf_cookie_echoed_prm_shutdown;
146sctp_state_fn_t sctp_sf_do_9_1_prm_abort;
147sctp_state_fn_t sctp_sf_cookie_wait_prm_abort;
148sctp_state_fn_t sctp_sf_cookie_echoed_prm_abort;
149sctp_state_fn_t sctp_sf_shutdown_pending_prm_abort;
150sctp_state_fn_t sctp_sf_shutdown_sent_prm_abort;
151sctp_state_fn_t sctp_sf_shutdown_ack_sent_prm_abort;
152sctp_state_fn_t sctp_sf_error_closed;
153sctp_state_fn_t sctp_sf_error_shutdown;
154sctp_state_fn_t sctp_sf_ignore_primitive;
155sctp_state_fn_t sctp_sf_do_prm_requestheartbeat;
156sctp_state_fn_t sctp_sf_do_prm_asconf;
157sctp_state_fn_t sctp_sf_do_prm_reconf;
158
159
160sctp_state_fn_t sctp_sf_do_no_pending_tsn;
161sctp_state_fn_t sctp_sf_do_9_2_start_shutdown;
162sctp_state_fn_t sctp_sf_do_9_2_shutdown_ack;
163sctp_state_fn_t sctp_sf_ignore_other;
164sctp_state_fn_t sctp_sf_cookie_wait_icmp_abort;
165
166
167sctp_state_fn_t sctp_sf_do_6_3_3_rtx;
168sctp_state_fn_t sctp_sf_send_reconf;
169sctp_state_fn_t sctp_sf_do_6_2_sack;
170sctp_state_fn_t sctp_sf_autoclose_timer_expire;
171
172
173__u8 sctp_get_chunk_type(struct sctp_chunk *chunk);
174const struct sctp_sm_table_entry *sctp_sm_lookup_event(
175 struct net *net,
176 enum sctp_event event_type,
177 enum sctp_state state,
178 union sctp_subtype event_subtype);
179int sctp_chunk_iif(const struct sctp_chunk *);
180struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *,
181 struct sctp_chunk *,
182 gfp_t gfp);
183__u32 sctp_generate_verification_tag(void);
184void sctp_populate_tie_tags(__u8 *cookie, __u32 curTag, __u32 hisTag);
185
186
187struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
188 const struct sctp_bind_addr *bp,
189 gfp_t gfp, int vparam_len);
190struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
191 const struct sctp_chunk *chunk,
192 const gfp_t gfp, const int unkparam_len);
193struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
194 const struct sctp_chunk *chunk);
195struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
196 const struct sctp_chunk *chunk);
197struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
198 const __u32 lowest_tsn,
199 const struct sctp_chunk *chunk);
200struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
201 const struct sctp_sndrcvinfo *sinfo,
202 int len, const __u8 flags,
203 __u16 ssn, gfp_t gfp);
204struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
205 const __u32 lowest_tsn);
206struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc);
207struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
208 const struct sctp_chunk *chunk);
209struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
210 const struct sctp_chunk *chunk);
211struct sctp_chunk *sctp_make_shutdown_complete(
212 const struct sctp_association *asoc,
213 const struct sctp_chunk *chunk);
214void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause, size_t paylen);
215struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
216 const struct sctp_chunk *chunk,
217 const size_t hint);
218struct sctp_chunk *sctp_make_abort_no_data(const struct sctp_association *asoc,
219 const struct sctp_chunk *chunk,
220 __u32 tsn);
221struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
222 struct msghdr *msg, size_t msg_len);
223struct sctp_chunk *sctp_make_abort_violation(
224 const struct sctp_association *asoc,
225 const struct sctp_chunk *chunk,
226 const __u8 *payload,
227 const size_t paylen);
228struct sctp_chunk *sctp_make_violation_paramlen(
229 const struct sctp_association *asoc,
230 const struct sctp_chunk *chunk,
231 struct sctp_paramhdr *param);
232struct sctp_chunk *sctp_make_violation_max_retrans(
233 const struct sctp_association *asoc,
234 const struct sctp_chunk *chunk);
235struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
236 const struct sctp_transport *transport);
237struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
238 const struct sctp_chunk *chunk,
239 const void *payload,
240 const size_t paylen);
241struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
242 const struct sctp_chunk *chunk,
243 __be16 cause_code, const void *payload,
244 size_t paylen, size_t reserve_tail);
245
246struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
247 union sctp_addr *laddr,
248 struct sockaddr *addrs,
249 int addrcnt, __be16 flags);
250struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
251 union sctp_addr *addr);
252bool sctp_verify_asconf(const struct sctp_association *asoc,
253 struct sctp_chunk *chunk, bool addr_param_needed,
254 struct sctp_paramhdr **errp);
255struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
256 struct sctp_chunk *asconf);
257int sctp_process_asconf_ack(struct sctp_association *asoc,
258 struct sctp_chunk *asconf_ack);
259struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
260 __u32 new_cum_tsn, size_t nstreams,
261 struct sctp_fwdtsn_skip *skiplist);
262struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc);
263struct sctp_chunk *sctp_make_strreset_req(const struct sctp_association *asoc,
264 __u16 stream_num, __be16 *stream_list,
265 bool out, bool in);
266struct sctp_chunk *sctp_make_strreset_tsnreq(
267 const struct sctp_association *asoc);
268struct sctp_chunk *sctp_make_strreset_addstrm(
269 const struct sctp_association *asoc,
270 __u16 out, __u16 in);
271struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc,
272 __u32 result, __u32 sn);
273struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc,
274 __u32 result, __u32 sn,
275 __u32 sender_tsn,
276 __u32 receiver_tsn);
277bool sctp_verify_reconf(const struct sctp_association *asoc,
278 struct sctp_chunk *chunk,
279 struct sctp_paramhdr **errp);
280void sctp_chunk_assign_tsn(struct sctp_chunk *chunk);
281void sctp_chunk_assign_ssn(struct sctp_chunk *chunk);
282
283
284struct sctp_chunk *sctp_process_strreset_outreq(
285 struct sctp_association *asoc,
286 union sctp_params param,
287 struct sctp_ulpevent **evp);
288struct sctp_chunk *sctp_process_strreset_inreq(
289 struct sctp_association *asoc,
290 union sctp_params param,
291 struct sctp_ulpevent **evp);
292struct sctp_chunk *sctp_process_strreset_tsnreq(
293 struct sctp_association *asoc,
294 union sctp_params param,
295 struct sctp_ulpevent **evp);
296struct sctp_chunk *sctp_process_strreset_addstrm_out(
297 struct sctp_association *asoc,
298 union sctp_params param,
299 struct sctp_ulpevent **evp);
300struct sctp_chunk *sctp_process_strreset_addstrm_in(
301 struct sctp_association *asoc,
302 union sctp_params param,
303 struct sctp_ulpevent **evp);
304struct sctp_chunk *sctp_process_strreset_resp(
305 struct sctp_association *asoc,
306 union sctp_params param,
307 struct sctp_ulpevent **evp);
308
309
310
311int sctp_do_sm(struct net *net, enum sctp_event event_type,
312 union sctp_subtype subtype, enum sctp_state state,
313 struct sctp_endpoint *ep, struct sctp_association *asoc,
314 void *event_arg, gfp_t gfp);
315
316
317void sctp_generate_t3_rtx_event(unsigned long peer);
318void sctp_generate_heartbeat_event(unsigned long peer);
319void sctp_generate_reconf_event(unsigned long peer);
320void sctp_generate_proto_unreach_event(unsigned long peer);
321
322void sctp_ootb_pkt_free(struct sctp_packet *packet);
323
324struct sctp_association *sctp_unpack_cookie(
325 const struct sctp_endpoint *ep,
326 const struct sctp_association *asoc,
327 struct sctp_chunk *chunk,
328 gfp_t gfp, int *err,
329 struct sctp_chunk **err_chk_p);
330
331
332__u32 sctp_generate_tag(const struct sctp_endpoint *ep);
333__u32 sctp_generate_tsn(const struct sctp_endpoint *ep);
334
335
336extern sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES];
337
338
339
340static inline __u16 sctp_data_size(struct sctp_chunk *chunk)
341{
342 __u16 size;
343
344 size = ntohs(chunk->chunk_hdr->length);
345 size -= sizeof(struct sctp_data_chunk);
346
347 return size;
348}
349
350
351#define TSN_lt(a,b) \
352 (typecheck(__u32, a) && \
353 typecheck(__u32, b) && \
354 ((__s32)((a) - (b)) < 0))
355
356#define TSN_lte(a,b) \
357 (typecheck(__u32, a) && \
358 typecheck(__u32, b) && \
359 ((__s32)((a) - (b)) <= 0))
360
361
362#define SSN_lt(a,b) \
363 (typecheck(__u16, a) && \
364 typecheck(__u16, b) && \
365 ((__s16)((a) - (b)) < 0))
366
367
368#define ADDIP_SERIAL_gte(a,b) \
369 (typecheck(__u32, a) && \
370 typecheck(__u32, b) && \
371 ((__s32)((b) - (a)) <= 0))
372
373
374static inline int
375sctp_vtag_verify(const struct sctp_chunk *chunk,
376 const struct sctp_association *asoc)
377{
378
379
380
381
382
383
384 if (ntohl(chunk->sctp_hdr->vtag) == asoc->c.my_vtag)
385 return 1;
386
387 return 0;
388}
389
390
391
392
393static inline int
394sctp_vtag_verify_either(const struct sctp_chunk *chunk,
395 const struct sctp_association *asoc)
396{
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418 if ((!sctp_test_T_bit(chunk) &&
419 (ntohl(chunk->sctp_hdr->vtag) == asoc->c.my_vtag)) ||
420 (sctp_test_T_bit(chunk) && asoc->c.peer_vtag &&
421 (ntohl(chunk->sctp_hdr->vtag) == asoc->c.peer_vtag))) {
422 return 1;
423 }
424
425 return 0;
426}
427
428#endif
429