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Linux/include/net/sctp/sm.h

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  1 /* SCTP kernel implementation
  2  * (C) Copyright IBM Corp. 2001, 2004
  3  * Copyright (c) 1999-2000 Cisco, Inc.
  4  * Copyright (c) 1999-2001 Motorola, Inc.
  5  * Copyright (c) 2001 Intel Corp.
  6  *
  7  * This file is part of the SCTP kernel implementation
  8  *
  9  * These are definitions needed by the state machine.
 10  *
 11  * This SCTP implementation is free software;
 12  * you can redistribute it and/or modify it under the terms of
 13  * the GNU General Public License as published by
 14  * the Free Software Foundation; either version 2, or (at your option)
 15  * any later version.
 16  *
 17  * This SCTP implementation is distributed in the hope that it
 18  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 19  *                 ************************
 20  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 21  * See the GNU General Public License for more details.
 22  *
 23  * You should have received a copy of the GNU General Public License
 24  * along with GNU CC; see the file COPYING.  If not, write to
 25  * the Free Software Foundation, 59 Temple Place - Suite 330,
 26  * Boston, MA 02111-1307, USA.
 27  *
 28  * Please send any bug reports or fixes you make to the
 29  * email addresses:
 30  *    lksctp developers <lksctp-developers@lists.sourceforge.net>
 31  *
 32  * Or submit a bug report through the following website:
 33  *    http://www.sf.net/projects/lksctp
 34  *
 35  * Written or modified by:
 36  *    La Monte H.P. Yarroll <piggy@acm.org>
 37  *    Karl Knutson <karl@athena.chicago.il.us>
 38  *    Xingang Guo <xingang.guo@intel.com>
 39  *    Jon Grimm <jgrimm@us.ibm.com>
 40  *    Dajiang Zhang <dajiang.zhang@nokia.com>
 41  *    Sridhar Samudrala <sri@us.ibm.com>
 42  *    Daisy Chang <daisyc@us.ibm.com>
 43  *    Ardelle Fan <ardelle.fan@intel.com>
 44  *    Kevin Gao <kevin.gao@intel.com>
 45  *
 46  * Any bugs reported given to us we will try to fix... any fixes shared will
 47  * be incorporated into the next SCTP release.
 48  */
 49 
 50 #include <linux/types.h>
 51 #include <linux/compiler.h>
 52 #include <linux/slab.h>
 53 #include <linux/in.h>
 54 #include <net/sctp/command.h>
 55 #include <net/sctp/sctp.h>
 56 
 57 #ifndef __sctp_sm_h__
 58 #define __sctp_sm_h__
 59 
 60 /*
 61  * Possible values for the disposition are:
 62  */
 63 typedef enum {
 64         SCTP_DISPOSITION_DISCARD,        /* No further processing.  */
 65         SCTP_DISPOSITION_CONSUME,        /* Process return values normally.  */
 66         SCTP_DISPOSITION_NOMEM,          /* We ran out of memory--recover.  */
 67         SCTP_DISPOSITION_DELETE_TCB,     /* Close the association.  */
 68         SCTP_DISPOSITION_ABORT,          /* Close the association NOW.  */
 69         SCTP_DISPOSITION_VIOLATION,      /* The peer is misbehaving.  */
 70         SCTP_DISPOSITION_NOT_IMPL,       /* This entry is not implemented.  */
 71         SCTP_DISPOSITION_ERROR,          /* This is plain old user error.  */
 72         SCTP_DISPOSITION_BUG,            /* This is a bug.  */
 73 } sctp_disposition_t;
 74 
 75 typedef struct {
 76         int name;
 77         int action;
 78 } sctp_sm_command_t;
 79 
 80 typedef sctp_disposition_t (sctp_state_fn_t) (const struct sctp_endpoint *,
 81                                               const struct sctp_association *,
 82                                               const sctp_subtype_t type,
 83                                               void *arg,
 84                                               sctp_cmd_seq_t *);
 85 typedef void (sctp_timer_event_t) (unsigned long);
 86 typedef struct {
 87         sctp_state_fn_t *fn;
 88         const char *name;
 89 } sctp_sm_table_entry_t;
 90 
 91 /* A naming convention of "sctp_sf_xxx" applies to all the state functions
 92  * currently in use.
 93  */
 94 
 95 /* Prototypes for generic state functions. */
 96 sctp_state_fn_t sctp_sf_not_impl;
 97 sctp_state_fn_t sctp_sf_bug;
 98 
 99 /* Prototypes for gener timer state functions. */
100 sctp_state_fn_t sctp_sf_timer_ignore;
101 
102 /* Prototypes for chunk state functions. */
103 sctp_state_fn_t sctp_sf_do_9_1_abort;
104 sctp_state_fn_t sctp_sf_cookie_wait_abort;
105 sctp_state_fn_t sctp_sf_cookie_echoed_abort;
106 sctp_state_fn_t sctp_sf_shutdown_pending_abort;
107 sctp_state_fn_t sctp_sf_shutdown_sent_abort;
108 sctp_state_fn_t sctp_sf_shutdown_ack_sent_abort;
109 sctp_state_fn_t sctp_sf_do_5_1B_init;
110 sctp_state_fn_t sctp_sf_do_5_1C_ack;
111 sctp_state_fn_t sctp_sf_do_5_1D_ce;
112 sctp_state_fn_t sctp_sf_do_5_1E_ca;
113 sctp_state_fn_t sctp_sf_do_4_C;
114 sctp_state_fn_t sctp_sf_eat_data_6_2;
115 sctp_state_fn_t sctp_sf_eat_data_fast_4_4;
116 sctp_state_fn_t sctp_sf_eat_sack_6_2;
117 sctp_state_fn_t sctp_sf_operr_notify;
118 sctp_state_fn_t sctp_sf_t1_init_timer_expire;
119 sctp_state_fn_t sctp_sf_t1_cookie_timer_expire;
120 sctp_state_fn_t sctp_sf_t2_timer_expire;
121 sctp_state_fn_t sctp_sf_t4_timer_expire;
122 sctp_state_fn_t sctp_sf_t5_timer_expire;
123 sctp_state_fn_t sctp_sf_sendbeat_8_3;
124 sctp_state_fn_t sctp_sf_beat_8_3;
125 sctp_state_fn_t sctp_sf_backbeat_8_3;
126 sctp_state_fn_t sctp_sf_do_9_2_final;
127 sctp_state_fn_t sctp_sf_do_9_2_shutdown;
128 sctp_state_fn_t sctp_sf_do_9_2_shut_ctsn;
129 sctp_state_fn_t sctp_sf_do_ecn_cwr;
130 sctp_state_fn_t sctp_sf_do_ecne;
131 sctp_state_fn_t sctp_sf_ootb;
132 sctp_state_fn_t sctp_sf_pdiscard;
133 sctp_state_fn_t sctp_sf_violation;
134 sctp_state_fn_t sctp_sf_discard_chunk;
135 sctp_state_fn_t sctp_sf_do_5_2_1_siminit;
136 sctp_state_fn_t sctp_sf_do_5_2_2_dupinit;
137 sctp_state_fn_t sctp_sf_do_5_2_3_initack;
138 sctp_state_fn_t sctp_sf_do_5_2_4_dupcook;
139 sctp_state_fn_t sctp_sf_unk_chunk;
140 sctp_state_fn_t sctp_sf_do_8_5_1_E_sa;
141 sctp_state_fn_t sctp_sf_cookie_echoed_err;
142 sctp_state_fn_t sctp_sf_do_asconf;
143 sctp_state_fn_t sctp_sf_do_asconf_ack;
144 sctp_state_fn_t sctp_sf_do_9_2_reshutack;
145 sctp_state_fn_t sctp_sf_eat_fwd_tsn;
146 sctp_state_fn_t sctp_sf_eat_fwd_tsn_fast;
147 sctp_state_fn_t sctp_sf_eat_auth;
148 
149 /* Prototypes for primitive event state functions.  */
150 sctp_state_fn_t sctp_sf_do_prm_asoc;
151 sctp_state_fn_t sctp_sf_do_prm_send;
152 sctp_state_fn_t sctp_sf_do_9_2_prm_shutdown;
153 sctp_state_fn_t sctp_sf_cookie_wait_prm_shutdown;
154 sctp_state_fn_t sctp_sf_cookie_echoed_prm_shutdown;
155 sctp_state_fn_t sctp_sf_do_9_1_prm_abort;
156 sctp_state_fn_t sctp_sf_cookie_wait_prm_abort;
157 sctp_state_fn_t sctp_sf_cookie_echoed_prm_abort;
158 sctp_state_fn_t sctp_sf_shutdown_pending_prm_abort;
159 sctp_state_fn_t sctp_sf_shutdown_sent_prm_abort;
160 sctp_state_fn_t sctp_sf_shutdown_ack_sent_prm_abort;
161 sctp_state_fn_t sctp_sf_error_closed;
162 sctp_state_fn_t sctp_sf_error_shutdown;
163 sctp_state_fn_t sctp_sf_ignore_primitive;
164 sctp_state_fn_t sctp_sf_do_prm_requestheartbeat;
165 sctp_state_fn_t sctp_sf_do_prm_asconf;
166 
167 /* Prototypes for other event state functions.  */
168 sctp_state_fn_t sctp_sf_do_9_2_start_shutdown;
169 sctp_state_fn_t sctp_sf_do_9_2_shutdown_ack;
170 sctp_state_fn_t sctp_sf_ignore_other;
171 sctp_state_fn_t sctp_sf_cookie_wait_icmp_abort;
172 
173 /* Prototypes for timeout event state functions.  */
174 sctp_state_fn_t sctp_sf_do_6_3_3_rtx;
175 sctp_state_fn_t sctp_sf_do_6_2_sack;
176 sctp_state_fn_t sctp_sf_autoclose_timer_expire;
177 
178 /* Prototypes for utility support functions.  */
179 __u8 sctp_get_chunk_type(struct sctp_chunk *chunk);
180 const sctp_sm_table_entry_t *sctp_sm_lookup_event(sctp_event_t,
181                                             sctp_state_t,
182                                             sctp_subtype_t);
183 int sctp_chunk_iif(const struct sctp_chunk *);
184 struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *,
185                                              struct sctp_chunk *,
186                                              gfp_t gfp);
187 __u32 sctp_generate_verification_tag(void);
188 void sctp_populate_tie_tags(__u8 *cookie, __u32 curTag, __u32 hisTag);
189 
190 /* Prototypes for chunk-building functions.  */
191 struct sctp_chunk *sctp_make_init(const struct sctp_association *,
192                              const struct sctp_bind_addr *,
193                              gfp_t gfp, int vparam_len);
194 struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *,
195                                  const struct sctp_chunk *,
196                                  const gfp_t gfp,
197                                  const int unkparam_len);
198 struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *,
199                                     const struct sctp_chunk *);
200 struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *,
201                                    const struct sctp_chunk *);
202 struct sctp_chunk *sctp_make_cwr(const struct sctp_association *,
203                                  const __u32 lowest_tsn,
204                                  const struct sctp_chunk *);
205 struct sctp_chunk * sctp_make_datafrag_empty(struct sctp_association *,
206                                         const struct sctp_sndrcvinfo *sinfo,
207                                         int len, const __u8 flags,
208                                         __u16 ssn);
209 struct sctp_chunk *sctp_make_ecne(const struct sctp_association *,
210                                   const __u32);
211 struct sctp_chunk *sctp_make_sack(const struct sctp_association *);
212 struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
213                                       const struct sctp_chunk *chunk);
214 struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
215                                           const struct sctp_chunk *);
216 struct sctp_chunk *sctp_make_shutdown_complete(const struct sctp_association *,
217                                           const struct sctp_chunk *);
218 void sctp_init_cause(struct sctp_chunk *, __be16 cause, size_t);
219 struct sctp_chunk *sctp_make_abort(const struct sctp_association *,
220                               const struct sctp_chunk *,
221                               const size_t hint);
222 struct sctp_chunk *sctp_make_abort_no_data(const struct sctp_association *,
223                                       const struct sctp_chunk *,
224                                       __u32 tsn);
225 struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *,
226                                         const struct msghdr *, size_t msg_len);
227 struct sctp_chunk *sctp_make_abort_violation(const struct sctp_association *,
228                                    const struct sctp_chunk *,
229                                    const __u8 *,
230                                    const size_t );
231 struct sctp_chunk *sctp_make_violation_paramlen(const struct sctp_association *,
232                                    const struct sctp_chunk *,
233                                    struct sctp_paramhdr *);
234 struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *,
235                                   const struct sctp_transport *,
236                                   const void *payload,
237                                   const size_t paylen);
238 struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *,
239                                       const struct sctp_chunk *,
240                                       const void *payload,
241                                       const size_t paylen);
242 struct sctp_chunk *sctp_make_op_error(const struct sctp_association *,
243                                  const struct sctp_chunk *chunk,
244                                  __be16 cause_code,
245                                  const void *payload,
246                                  size_t paylen);
247 
248 struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *,
249                                               union sctp_addr *,
250                                               struct sockaddr *,
251                                               int, __be16);
252 struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
253                                              union sctp_addr *addr);
254 bool sctp_verify_asconf(const struct sctp_association *asoc,
255                         struct sctp_chunk *chunk, bool addr_param_needed,
256                         struct sctp_paramhdr **errp);
257 struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
258                                        struct sctp_chunk *asconf);
259 int sctp_process_asconf_ack(struct sctp_association *asoc,
260                             struct sctp_chunk *asconf_ack);
261 struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
262                                     __u32 new_cum_tsn, size_t nstreams,
263                                     struct sctp_fwdtsn_skip *skiplist);
264 struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc);
265 
266 void sctp_chunk_assign_tsn(struct sctp_chunk *);
267 void sctp_chunk_assign_ssn(struct sctp_chunk *);
268 
269 /* Prototypes for statetable processing. */
270 
271 int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype,
272                sctp_state_t state,
273                struct sctp_endpoint *,
274                struct sctp_association *asoc,
275                void *event_arg,
276                gfp_t gfp);
277 
278 /* 2nd level prototypes */
279 void sctp_generate_t3_rtx_event(unsigned long peer);
280 void sctp_generate_heartbeat_event(unsigned long peer);
281 void sctp_generate_proto_unreach_event(unsigned long peer);
282 
283 void sctp_ootb_pkt_free(struct sctp_packet *);
284 
285 struct sctp_association *sctp_unpack_cookie(const struct sctp_endpoint *,
286                                        const struct sctp_association *,
287                                        struct sctp_chunk *,
288                                        gfp_t gfp, int *err,
289                                        struct sctp_chunk **err_chk_p);
290 int sctp_addip_addr_config(struct sctp_association *, sctp_param_t,
291                            struct sockaddr_storage*, int);
292 
293 /* 3rd level prototypes */
294 __u32 sctp_generate_tag(const struct sctp_endpoint *);
295 __u32 sctp_generate_tsn(const struct sctp_endpoint *);
296 
297 /* Extern declarations for major data structures.  */
298 extern sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES];
299 
300 
301 /* Get the size of a DATA chunk payload. */
302 static inline __u16 sctp_data_size(struct sctp_chunk *chunk)
303 {
304         __u16 size;
305 
306         size = ntohs(chunk->chunk_hdr->length);
307         size -= sizeof(sctp_data_chunk_t);
308 
309         return size;
310 }
311 
312 /* Compare two TSNs */
313 
314 /* RFC 1982 - Serial Number Arithmetic
315  *
316  * 2. Comparison
317  *  Then, s1 is said to be equal to s2 if and only if i1 is equal to i2,
318  *  in all other cases, s1 is not equal to s2.
319  *
320  * s1 is said to be less than s2 if, and only if, s1 is not equal to s2,
321  * and
322  *
323  *      (i1 < i2 and i2 - i1 < 2^(SERIAL_BITS - 1)) or
324  *      (i1 > i2 and i1 - i2 > 2^(SERIAL_BITS - 1))
325  *
326  * s1 is said to be greater than s2 if, and only if, s1 is not equal to
327  * s2, and
328  *
329  *      (i1 < i2 and i2 - i1 > 2^(SERIAL_BITS - 1)) or
330  *      (i1 > i2 and i1 - i2 < 2^(SERIAL_BITS - 1))
331  */
332 
333 /*
334  * RFC 2960
335  *  1.6 Serial Number Arithmetic
336  *
337  * Comparisons and arithmetic on TSNs in this document SHOULD use Serial
338  * Number Arithmetic as defined in [RFC1982] where SERIAL_BITS = 32.
339  */
340 
341 enum {
342         TSN_SIGN_BIT = (1<<31)
343 };
344 
345 static inline int TSN_lt(__u32 s, __u32 t)
346 {
347         return (((s) - (t)) & TSN_SIGN_BIT);
348 }
349 
350 static inline int TSN_lte(__u32 s, __u32 t)
351 {
352         return (((s) == (t)) || (((s) - (t)) & TSN_SIGN_BIT));
353 }
354 
355 /* Compare two SSNs */
356 
357 /*
358  * RFC 2960
359  *  1.6 Serial Number Arithmetic
360  *
361  * Comparisons and arithmetic on Stream Sequence Numbers in this document
362  * SHOULD use Serial Number Arithmetic as defined in [RFC1982] where
363  * SERIAL_BITS = 16.
364  */
365 enum {
366         SSN_SIGN_BIT = (1<<15)
367 };
368 
369 static inline int SSN_lt(__u16 s, __u16 t)
370 {
371         return (((s) - (t)) & SSN_SIGN_BIT);
372 }
373 
374 static inline int SSN_lte(__u16 s, __u16 t)
375 {
376         return (((s) == (t)) || (((s) - (t)) & SSN_SIGN_BIT));
377 }
378 
379 /*
380  * ADDIP 3.1.1
381  * The valid range of Serial Number is from 0 to 4294967295 (2**32 - 1). Serial
382  * Numbers wrap back to 0 after reaching 4294967295.
383  */
384 enum {
385         ADDIP_SERIAL_SIGN_BIT = (1<<31)
386 };
387 
388 static inline int ADDIP_SERIAL_gte(__u16 s, __u16 t)
389 {
390         return (((s) == (t)) || (((t) - (s)) & ADDIP_SERIAL_SIGN_BIT));
391 }
392 
393 /* Check VTAG of the packet matches the sender's own tag. */
394 static inline int
395 sctp_vtag_verify(const struct sctp_chunk *chunk,
396                  const struct sctp_association *asoc)
397 {
398         /* RFC 2960 Sec 8.5 When receiving an SCTP packet, the endpoint
399          * MUST ensure that the value in the Verification Tag field of
400          * the received SCTP packet matches its own Tag. If the received
401          * Verification Tag value does not match the receiver's own
402          * tag value, the receiver shall silently discard the packet...
403          */
404         if (ntohl(chunk->sctp_hdr->vtag) == asoc->c.my_vtag)
405                 return 1;
406 
407         return 0;
408 }
409 
410 /* Check VTAG of the packet matches the sender's own tag and the T bit is
411  * not set, OR its peer's tag and the T bit is set in the Chunk Flags.
412  */
413 static inline int
414 sctp_vtag_verify_either(const struct sctp_chunk *chunk,
415                         const struct sctp_association *asoc)
416 {
417         /* RFC 2960 Section 8.5.1, sctpimpguide Section 2.41
418          *
419          * B) The receiver of a ABORT MUST accept the packet
420          *    if the Verification Tag field of the packet matches its own tag
421          *    and the T bit is not set
422          *    OR
423          *    it is set to its peer's tag and the T bit is set in the Chunk
424          *    Flags.
425          *    Otherwise, the receiver MUST silently discard the packet
426          *    and take no further action.
427          *
428          * C) The receiver of a SHUTDOWN COMPLETE shall accept the packet
429          *    if the Verification Tag field of the packet matches its own tag
430          *    and the T bit is not set
431          *    OR
432          *    it is set to its peer's tag and the T bit is set in the Chunk
433          *    Flags.
434          *    Otherwise, the receiver MUST silently discard the packet
435          *    and take no further action.  An endpoint MUST ignore the
436          *    SHUTDOWN COMPLETE if it is not in the SHUTDOWN-ACK-SENT state.
437          */
438         if ((!sctp_test_T_bit(chunk) &&
439              (ntohl(chunk->sctp_hdr->vtag) == asoc->c.my_vtag)) ||
440             (sctp_test_T_bit(chunk) &&
441              (ntohl(chunk->sctp_hdr->vtag) == asoc->c.peer_vtag))) {
442                 return 1;
443         }
444 
445         return 0;
446 }
447 
448 #endif /* __sctp_sm_h__ */
449 

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