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Linux/include/net/sctp/structs.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  * This SCTP implementation is free software;
 10  * you can redistribute it and/or modify it under the terms of
 11  * the GNU General Public License as published by
 12  * the Free Software Foundation; either version 2, or (at your option)
 13  * any later version.
 14  *
 15  * This SCTP implementation is distributed in the hope that it
 16  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 17  *                 ************************
 18  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 19  * See the GNU General Public License for more details.
 20  *
 21  * You should have received a copy of the GNU General Public License
 22  * along with GNU CC; see the file COPYING.  If not, see
 23  * <http://www.gnu.org/licenses/>.
 24  *
 25  * Please send any bug reports or fixes you make to the
 26  * email addresses:
 27  *    lksctp developers <linux-sctp@vger.kernel.org>
 28  *
 29  * Written or modified by:
 30  *    Randall Stewart       <randall@sctp.chicago.il.us>
 31  *    Ken Morneau           <kmorneau@cisco.com>
 32  *    Qiaobing Xie          <qxie1@email.mot.com>
 33  *    La Monte H.P. Yarroll <piggy@acm.org>
 34  *    Karl Knutson          <karl@athena.chicago.il.us>
 35  *    Jon Grimm             <jgrimm@us.ibm.com>
 36  *    Xingang Guo           <xingang.guo@intel.com>
 37  *    Hui Huang             <hui.huang@nokia.com>
 38  *    Sridhar Samudrala     <sri@us.ibm.com>
 39  *    Daisy Chang           <daisyc@us.ibm.com>
 40  *    Dajiang Zhang         <dajiang.zhang@nokia.com>
 41  *    Ardelle Fan           <ardelle.fan@intel.com>
 42  *    Ryan Layer            <rmlayer@us.ibm.com>
 43  *    Anup Pemmaiah         <pemmaiah@cc.usu.edu>
 44  *    Kevin Gao             <kevin.gao@intel.com>
 45  */
 46 
 47 #ifndef __sctp_structs_h__
 48 #define __sctp_structs_h__
 49 
 50 #include <linux/ktime.h>
 51 #include <linux/rhashtable.h>
 52 #include <linux/socket.h>       /* linux/in.h needs this!!    */
 53 #include <linux/in.h>           /* We get struct sockaddr_in. */
 54 #include <linux/in6.h>          /* We get struct in6_addr     */
 55 #include <linux/ipv6.h>
 56 #include <asm/param.h>          /* We get MAXHOSTNAMELEN.     */
 57 #include <linux/atomic.h>               /* This gets us atomic counters.  */
 58 #include <linux/skbuff.h>       /* We need sk_buff_head. */
 59 #include <linux/workqueue.h>    /* We need tq_struct.    */
 60 #include <linux/sctp.h>         /* We need sctp* header structs.  */
 61 #include <net/sctp/auth.h>      /* We need auth specific structs */
 62 
 63 /* A convenience structure for handling sockaddr structures.
 64  * We should wean ourselves off this.
 65  */
 66 union sctp_addr {
 67         struct sockaddr_in v4;
 68         struct sockaddr_in6 v6;
 69         struct sockaddr sa;
 70 };
 71 
 72 /* Forward declarations for data structures. */
 73 struct sctp_globals;
 74 struct sctp_endpoint;
 75 struct sctp_association;
 76 struct sctp_transport;
 77 struct sctp_packet;
 78 struct sctp_chunk;
 79 struct sctp_inq;
 80 struct sctp_outq;
 81 struct sctp_bind_addr;
 82 struct sctp_ulpq;
 83 struct sctp_ep_common;
 84 struct sctp_ssnmap;
 85 struct crypto_shash;
 86 
 87 
 88 #include <net/sctp/tsnmap.h>
 89 #include <net/sctp/ulpevent.h>
 90 #include <net/sctp/ulpqueue.h>
 91 
 92 /* Structures useful for managing bind/connect. */
 93 
 94 struct sctp_bind_bucket {
 95         unsigned short  port;
 96         unsigned short  fastreuse;
 97         struct hlist_node       node;
 98         struct hlist_head       owner;
 99         struct net      *net;
100 };
101 
102 struct sctp_bind_hashbucket {
103         spinlock_t      lock;
104         struct hlist_head       chain;
105 };
106 
107 /* Used for hashing all associations.  */
108 struct sctp_hashbucket {
109         rwlock_t        lock;
110         struct hlist_head       chain;
111 } __attribute__((__aligned__(8)));
112 
113 
114 /* The SCTP globals structure. */
115 extern struct sctp_globals {
116         /* This is a list of groups of functions for each address
117          * family that we support.
118          */
119         struct list_head address_families;
120 
121         /* This is the hash of all endpoints. */
122         struct sctp_hashbucket *ep_hashtable;
123         /* This is the sctp port control hash.  */
124         struct sctp_bind_hashbucket *port_hashtable;
125         /* This is the hash of all transports. */
126         struct rhashtable transport_hashtable;
127 
128         /* Sizes of above hashtables. */
129         int ep_hashsize;
130         int port_hashsize;
131 
132         /* Default initialization values to be applied to new associations. */
133         __u16 max_instreams;
134         __u16 max_outstreams;
135 
136         /* Flag to indicate whether computing and verifying checksum
137          * is disabled. */
138         bool checksum_disable;
139 } sctp_globals;
140 
141 #define sctp_max_instreams              (sctp_globals.max_instreams)
142 #define sctp_max_outstreams             (sctp_globals.max_outstreams)
143 #define sctp_address_families           (sctp_globals.address_families)
144 #define sctp_ep_hashsize                (sctp_globals.ep_hashsize)
145 #define sctp_ep_hashtable               (sctp_globals.ep_hashtable)
146 #define sctp_port_hashsize              (sctp_globals.port_hashsize)
147 #define sctp_port_hashtable             (sctp_globals.port_hashtable)
148 #define sctp_transport_hashtable        (sctp_globals.transport_hashtable)
149 #define sctp_checksum_disable           (sctp_globals.checksum_disable)
150 
151 /* SCTP Socket type: UDP or TCP style. */
152 typedef enum {
153         SCTP_SOCKET_UDP = 0,
154         SCTP_SOCKET_UDP_HIGH_BANDWIDTH,
155         SCTP_SOCKET_TCP
156 } sctp_socket_type_t;
157 
158 /* Per socket SCTP information. */
159 struct sctp_sock {
160         /* inet_sock has to be the first member of sctp_sock */
161         struct inet_sock inet;
162         /* What kind of a socket is this? */
163         sctp_socket_type_t type;
164 
165         /* PF_ family specific functions.  */
166         struct sctp_pf *pf;
167 
168         /* Access to HMAC transform. */
169         struct crypto_shash *hmac;
170         char *sctp_hmac_alg;
171 
172         /* What is our base endpointer? */
173         struct sctp_endpoint *ep;
174 
175         struct sctp_bind_bucket *bind_hash;
176         /* Various Socket Options.  */
177         __u16 default_stream;
178         __u32 default_ppid;
179         __u16 default_flags;
180         __u32 default_context;
181         __u32 default_timetolive;
182         __u32 default_rcv_context;
183         int max_burst;
184 
185         /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
186          * the destination address every heartbeat interval. This value
187          * will be inherited by all new associations.
188          */
189         __u32 hbinterval;
190 
191         /* This is the max_retrans value for new associations. */
192         __u16 pathmaxrxt;
193 
194         /* The initial Path MTU to use for new associations. */
195         __u32 pathmtu;
196 
197         /* The default SACK delay timeout for new associations. */
198         __u32 sackdelay;
199         __u32 sackfreq;
200 
201         /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
202         __u32 param_flags;
203 
204         struct sctp_initmsg initmsg;
205         struct sctp_rtoinfo rtoinfo;
206         struct sctp_paddrparams paddrparam;
207         struct sctp_event_subscribe subscribe;
208         struct sctp_assocparams assocparams;
209 
210         int user_frag;
211 
212         __u32 autoclose;
213         __u8 nodelay;
214         __u8 disable_fragments;
215         __u8 v4mapped;
216         __u8 frag_interleave;
217         __u32 adaptation_ind;
218         __u32 pd_point;
219         __u8 recvrcvinfo;
220         __u8 recvnxtinfo;
221 
222         atomic_t pd_mode;
223         /* Receive to here while partial delivery is in effect. */
224         struct sk_buff_head pd_lobby;
225 
226         /* These must be the last fields, as they will skipped on copies,
227          * like on accept and peeloff operations
228          */
229         struct list_head auto_asconf_list;
230         int do_auto_asconf;
231 };
232 
233 static inline struct sctp_sock *sctp_sk(const struct sock *sk)
234 {
235        return (struct sctp_sock *)sk;
236 }
237 
238 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp)
239 {
240        return (struct sock *)sp;
241 }
242 
243 #if IS_ENABLED(CONFIG_IPV6)
244 struct sctp6_sock {
245        struct sctp_sock  sctp;
246        struct ipv6_pinfo inet6;
247 };
248 #endif /* CONFIG_IPV6 */
249 
250 
251 /* This is our APPLICATION-SPECIFIC state cookie.
252  * THIS IS NOT DICTATED BY THE SPECIFICATION.
253  */
254 /* These are the parts of an association which we send in the cookie.
255  * Most of these are straight out of:
256  * RFC2960 12.2 Parameters necessary per association (i.e. the TCB)
257  *
258  */
259 
260 struct sctp_cookie {
261 
262         /* My          : Tag expected in every inbound packet and sent
263          * Verification: in the INIT or INIT ACK chunk.
264          * Tag         :
265          */
266         __u32 my_vtag;
267 
268         /* Peer's      : Tag expected in every outbound packet except
269          * Verification: in the INIT chunk.
270          * Tag         :
271          */
272         __u32 peer_vtag;
273 
274         /* The rest of these are not from the spec, but really need to
275          * be in the cookie.
276          */
277 
278         /* My Tie Tag  : Assist in discovering a restarting association. */
279         __u32 my_ttag;
280 
281         /* Peer's Tie Tag: Assist in discovering a restarting association. */
282         __u32 peer_ttag;
283 
284         /* When does this cookie expire? */
285         ktime_t expiration;
286 
287         /* Number of inbound/outbound streams which are set
288          * and negotiated during the INIT process.
289          */
290         __u16 sinit_num_ostreams;
291         __u16 sinit_max_instreams;
292 
293         /* This is the first sequence number I used.  */
294         __u32 initial_tsn;
295 
296         /* This holds the originating address of the INIT packet.  */
297         union sctp_addr peer_addr;
298 
299         /* IG Section 2.35.3 
300          * Include the source port of the INIT-ACK
301          */
302         __u16           my_port;
303 
304         __u8 prsctp_capable;
305 
306         /* Padding for future use */
307         __u8 padding;           
308 
309         __u32 adaptation_ind;
310 
311         __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH];
312         __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2];
313         __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS];
314 
315         /* This is a shim for my peer's INIT packet, followed by
316          * a copy of the raw address list of the association.
317          * The length of the raw address list is saved in the
318          * raw_addr_list_len field, which will be used at the time when
319          * the association TCB is re-constructed from the cookie.
320          */
321         __u32 raw_addr_list_len;
322         struct sctp_init_chunk peer_init[0];
323 };
324 
325 
326 /* The format of our cookie that we send to our peer. */
327 struct sctp_signed_cookie {
328         __u8 signature[SCTP_SECRET_SIZE];
329         __u32 __pad;            /* force sctp_cookie alignment to 64 bits */
330         struct sctp_cookie c;
331 } __packed;
332 
333 /* This is another convenience type to allocate memory for address
334  * params for the maximum size and pass such structures around
335  * internally.
336  */
337 union sctp_addr_param {
338         struct sctp_paramhdr p;
339         struct sctp_ipv4addr_param v4;
340         struct sctp_ipv6addr_param v6;
341 };
342 
343 /* A convenience type to allow walking through the various
344  * parameters and avoid casting all over the place.
345  */
346 union sctp_params {
347         void *v;
348         struct sctp_paramhdr *p;
349         struct sctp_cookie_preserve_param *life;
350         struct sctp_hostname_param *dns;
351         struct sctp_cookie_param *cookie;
352         struct sctp_supported_addrs_param *sat;
353         struct sctp_ipv4addr_param *v4;
354         struct sctp_ipv6addr_param *v6;
355         union sctp_addr_param *addr;
356         struct sctp_adaptation_ind_param *aind;
357         struct sctp_supported_ext_param *ext;
358         struct sctp_random_param *random;
359         struct sctp_chunks_param *chunks;
360         struct sctp_hmac_algo_param *hmac_algo;
361         struct sctp_addip_param *addip;
362 };
363 
364 /* RFC 2960.  Section 3.3.5 Heartbeat.
365  *    Heartbeat Information: variable length
366  *    The Sender-specific Heartbeat Info field should normally include
367  *    information about the sender's current time when this HEARTBEAT
368  *    chunk is sent and the destination transport address to which this
369  *    HEARTBEAT is sent (see Section 8.3).
370  */
371 typedef struct sctp_sender_hb_info {
372         struct sctp_paramhdr param_hdr;
373         union sctp_addr daddr;
374         unsigned long sent_at;
375         __u64 hb_nonce;
376 } __packed sctp_sender_hb_info_t;
377 
378 /*
379  *  RFC 2960 1.3.2 Sequenced Delivery within Streams
380  *
381  *  The term "stream" is used in SCTP to refer to a sequence of user
382  *  messages that are to be delivered to the upper-layer protocol in
383  *  order with respect to other messages within the same stream.  This is
384  *  in contrast to its usage in TCP, where it refers to a sequence of
385  *  bytes (in this document a byte is assumed to be eight bits).
386  *  ...
387  *
388  *  This is the structure we use to track both our outbound and inbound
389  *  SSN, or Stream Sequence Numbers.
390  */
391 
392 struct sctp_stream {
393         __u16 *ssn;
394         unsigned int len;
395 };
396 
397 struct sctp_ssnmap {
398         struct sctp_stream in;
399         struct sctp_stream out;
400 };
401 
402 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out,
403                                     gfp_t gfp);
404 void sctp_ssnmap_free(struct sctp_ssnmap *map);
405 void sctp_ssnmap_clear(struct sctp_ssnmap *map);
406 
407 /* What is the current SSN number for this stream? */
408 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id)
409 {
410         return stream->ssn[id];
411 }
412 
413 /* Return the next SSN number for this stream.  */
414 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id)
415 {
416         return stream->ssn[id]++;
417 }
418 
419 /* Skip over this ssn and all below. */
420 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 
421                                  __u16 ssn)
422 {
423         stream->ssn[id] = ssn+1;
424 }
425               
426 /*
427  * Pointers to address related SCTP functions.
428  * (i.e. things that depend on the address family.)
429  */
430 struct sctp_af {
431         int             (*sctp_xmit)    (struct sk_buff *skb,
432                                          struct sctp_transport *);
433         int             (*setsockopt)   (struct sock *sk,
434                                          int level,
435                                          int optname,
436                                          char __user *optval,
437                                          unsigned int optlen);
438         int             (*getsockopt)   (struct sock *sk,
439                                          int level,
440                                          int optname,
441                                          char __user *optval,
442                                          int __user *optlen);
443         int             (*compat_setsockopt)    (struct sock *sk,
444                                          int level,
445                                          int optname,
446                                          char __user *optval,
447                                          unsigned int optlen);
448         int             (*compat_getsockopt)    (struct sock *sk,
449                                          int level,
450                                          int optname,
451                                          char __user *optval,
452                                          int __user *optlen);
453         void            (*get_dst)      (struct sctp_transport *t,
454                                          union sctp_addr *saddr,
455                                          struct flowi *fl,
456                                          struct sock *sk);
457         void            (*get_saddr)    (struct sctp_sock *sk,
458                                          struct sctp_transport *t,
459                                          struct flowi *fl);
460         void            (*copy_addrlist) (struct list_head *,
461                                           struct net_device *);
462         int             (*cmp_addr)     (const union sctp_addr *addr1,
463                                          const union sctp_addr *addr2);
464         void            (*addr_copy)    (union sctp_addr *dst,
465                                          union sctp_addr *src);
466         void            (*from_skb)     (union sctp_addr *,
467                                          struct sk_buff *skb,
468                                          int saddr);
469         void            (*from_sk)      (union sctp_addr *,
470                                          struct sock *sk);
471         void            (*from_addr_param) (union sctp_addr *,
472                                             union sctp_addr_param *,
473                                             __be16 port, int iif);
474         int             (*to_addr_param) (const union sctp_addr *,
475                                           union sctp_addr_param *); 
476         int             (*addr_valid)   (union sctp_addr *,
477                                          struct sctp_sock *,
478                                          const struct sk_buff *);
479         sctp_scope_t    (*scope) (union sctp_addr *);
480         void            (*inaddr_any)   (union sctp_addr *, __be16);
481         int             (*is_any)       (const union sctp_addr *);
482         int             (*available)    (union sctp_addr *,
483                                          struct sctp_sock *);
484         int             (*skb_iif)      (const struct sk_buff *sk);
485         int             (*is_ce)        (const struct sk_buff *sk);
486         void            (*seq_dump_addr)(struct seq_file *seq,
487                                          union sctp_addr *addr);
488         void            (*ecn_capable)(struct sock *sk);
489         __u16           net_header_len;
490         int             sockaddr_len;
491         sa_family_t     sa_family;
492         struct list_head list;
493 };
494 
495 struct sctp_af *sctp_get_af_specific(sa_family_t);
496 int sctp_register_af(struct sctp_af *);
497 
498 /* Protocol family functions. */
499 struct sctp_pf {
500         void (*event_msgname)(struct sctp_ulpevent *, char *, int *);
501         void (*skb_msgname)  (struct sk_buff *, char *, int *);
502         int  (*af_supported) (sa_family_t, struct sctp_sock *);
503         int  (*cmp_addr) (const union sctp_addr *,
504                           const union sctp_addr *,
505                           struct sctp_sock *);
506         int  (*bind_verify) (struct sctp_sock *, union sctp_addr *);
507         int  (*send_verify) (struct sctp_sock *, union sctp_addr *);
508         int  (*supported_addrs)(const struct sctp_sock *, __be16 *);
509         struct sock *(*create_accept_sk) (struct sock *sk,
510                                           struct sctp_association *asoc);
511         int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr);
512         void (*to_sk_saddr)(union sctp_addr *, struct sock *sk);
513         void (*to_sk_daddr)(union sctp_addr *, struct sock *sk);
514         struct sctp_af *af;
515 };
516 
517 
518 /* Structure to track chunk fragments that have been acked, but peer
519  * fragments of the same message have not.
520  */
521 struct sctp_datamsg {
522         /* Chunks waiting to be submitted to lower layer. */
523         struct list_head chunks;
524         /* Reference counting. */
525         atomic_t refcnt;
526         /* When is this message no longer interesting to the peer? */
527         unsigned long expires_at;
528         /* Did the messenge fail to send? */
529         int send_error;
530         u8 send_failed:1,
531            can_abandon:1,   /* can chunks from this message can be abandoned. */
532            can_delay;       /* should this message be Nagle delayed */
533 };
534 
535 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *,
536                                             struct sctp_sndrcvinfo *,
537                                             struct iov_iter *);
538 void sctp_datamsg_put(struct sctp_datamsg *);
539 void sctp_chunk_fail(struct sctp_chunk *, int error);
540 int sctp_chunk_abandoned(struct sctp_chunk *);
541 
542 /* RFC2960 1.4 Key Terms
543  *
544  * o Chunk: A unit of information within an SCTP packet, consisting of
545  * a chunk header and chunk-specific content.
546  *
547  * As a matter of convenience, we remember the SCTP common header for
548  * each chunk as well as a few other header pointers...
549  */
550 struct sctp_chunk {
551         struct list_head list;
552 
553         atomic_t refcnt;
554 
555         /* This is our link to the per-transport transmitted list.  */
556         struct list_head transmitted_list;
557 
558         /* This field is used by chunks that hold fragmented data.
559          * For the first fragment this is the list that holds the rest of
560          * fragments. For the remaining fragments, this is the link to the
561          * frag_list maintained in the first fragment.
562          */
563         struct list_head frag_list;
564 
565         /* This points to the sk_buff containing the actual data.  */
566         struct sk_buff *skb;
567 
568         /* These are the SCTP headers by reverse order in a packet.
569          * Note that some of these may happen more than once.  In that
570          * case, we point at the "current" one, whatever that means
571          * for that level of header.
572          */
573 
574         /* We point this at the FIRST TLV parameter to chunk_hdr.  */
575         union sctp_params param_hdr;
576         union {
577                 __u8 *v;
578                 struct sctp_datahdr *data_hdr;
579                 struct sctp_inithdr *init_hdr;
580                 struct sctp_sackhdr *sack_hdr;
581                 struct sctp_heartbeathdr *hb_hdr;
582                 struct sctp_sender_hb_info *hbs_hdr;
583                 struct sctp_shutdownhdr *shutdown_hdr;
584                 struct sctp_signed_cookie *cookie_hdr;
585                 struct sctp_ecnehdr *ecne_hdr;
586                 struct sctp_cwrhdr *ecn_cwr_hdr;
587                 struct sctp_errhdr *err_hdr;
588                 struct sctp_addiphdr *addip_hdr;
589                 struct sctp_fwdtsn_hdr *fwdtsn_hdr;
590                 struct sctp_authhdr *auth_hdr;
591         } subh;
592 
593         __u8 *chunk_end;
594 
595         struct sctp_chunkhdr *chunk_hdr;
596         struct sctphdr *sctp_hdr;
597 
598         /* This needs to be recoverable for SCTP_SEND_FAILED events. */
599         struct sctp_sndrcvinfo sinfo;
600 
601         /* Which association does this belong to?  */
602         struct sctp_association *asoc;
603 
604         /* What endpoint received this chunk? */
605         struct sctp_ep_common *rcvr;
606 
607         /* We fill this in if we are calculating RTT. */
608         unsigned long sent_at;
609 
610         /* What is the origin IP address for this chunk?  */
611         union sctp_addr source;
612         /* Destination address for this chunk. */
613         union sctp_addr dest;
614 
615         /* For outbound message, track all fragments for SEND_FAILED. */
616         struct sctp_datamsg *msg;
617 
618         /* For an inbound chunk, this tells us where it came from.
619          * For an outbound chunk, it tells us where we'd like it to
620          * go.  It is NULL if we have no preference.
621          */
622         struct sctp_transport *transport;
623 
624         /* SCTP-AUTH:  For the special case inbound processing of COOKIE-ECHO
625          * we need save a pointer to the AUTH chunk, since the SCTP-AUTH
626          * spec violates the principle premis that all chunks are processed
627          * in order.
628          */
629         struct sk_buff *auth_chunk;
630 
631 #define SCTP_CAN_FRTX 0x0
632 #define SCTP_NEED_FRTX 0x1
633 #define SCTP_DONT_FRTX 0x2
634         __u16   rtt_in_progress:1,      /* This chunk used for RTT calc? */
635                 resent:1,               /* Has this chunk ever been resent. */
636                 has_tsn:1,              /* Does this chunk have a TSN yet? */
637                 has_ssn:1,              /* Does this chunk have a SSN yet? */
638                 singleton:1,            /* Only chunk in the packet? */
639                 end_of_packet:1,        /* Last chunk in the packet? */
640                 ecn_ce_done:1,          /* Have we processed the ECN CE bit? */
641                 pdiscard:1,             /* Discard the whole packet now? */
642                 tsn_gap_acked:1,        /* Is this chunk acked by a GAP ACK? */
643                 data_accepted:1,        /* At least 1 chunk accepted */
644                 auth:1,                 /* IN: was auth'ed | OUT: needs auth */
645                 has_asconf:1,           /* IN: have seen an asconf before */
646                 tsn_missing_report:2,   /* Data chunk missing counter. */
647                 fast_retransmit:2;      /* Is this chunk fast retransmitted? */
648 };
649 
650 void sctp_chunk_hold(struct sctp_chunk *);
651 void sctp_chunk_put(struct sctp_chunk *);
652 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
653                           struct iov_iter *from);
654 void sctp_chunk_free(struct sctp_chunk *);
655 void  *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data);
656 struct sctp_chunk *sctp_chunkify(struct sk_buff *,
657                                  const struct sctp_association *,
658                                  struct sock *, gfp_t gfp);
659 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *,
660                      union sctp_addr *);
661 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk);
662 
663 enum {
664         SCTP_ADDR_NEW,          /* new address added to assoc/ep */
665         SCTP_ADDR_SRC,          /* address can be used as source */
666         SCTP_ADDR_DEL,          /* address about to be deleted */
667 };
668 
669 /* This is a structure for holding either an IPv6 or an IPv4 address.  */
670 struct sctp_sockaddr_entry {
671         struct list_head list;
672         struct rcu_head rcu;
673         union sctp_addr a;
674         __u8 state;
675         __u8 valid;
676 };
677 
678 #define SCTP_ADDRESS_TICK_DELAY 500
679 
680 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *);
681 
682 /* This structure holds lists of chunks as we are assembling for
683  * transmission.
684  */
685 struct sctp_packet {
686         /* These are the SCTP header values (host order) for the packet. */
687         __u16 source_port;
688         __u16 destination_port;
689         __u32 vtag;
690 
691         /* This contains the payload chunks.  */
692         struct list_head chunk_list;
693 
694         /* This is the overhead of the sctp and ip headers. */
695         size_t overhead;
696         /* This is the total size of all chunks INCLUDING padding.  */
697         size_t size;
698 
699         /* The packet is destined for this transport address.
700          * The function we finally use to pass down to the next lower
701          * layer lives in the transport structure.
702          */
703         struct sctp_transport *transport;
704 
705         /* pointer to the auth chunk for this packet */
706         struct sctp_chunk *auth;
707 
708         u8  has_cookie_echo:1,  /* This packet contains a COOKIE-ECHO chunk. */
709             has_sack:1,         /* This packet contains a SACK chunk. */
710             has_auth:1,         /* This packet contains an AUTH chunk */
711             has_data:1,         /* This packet contains at least 1 DATA chunk */
712             ipfragok:1;         /* So let ip fragment this packet */
713 };
714 
715 struct sctp_packet *sctp_packet_init(struct sctp_packet *,
716                                      struct sctp_transport *,
717                                      __u16 sport, __u16 dport);
718 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int);
719 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *,
720                                        struct sctp_chunk *, int, gfp_t);
721 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *,
722                                      struct sctp_chunk *);
723 int sctp_packet_transmit(struct sctp_packet *, gfp_t);
724 void sctp_packet_free(struct sctp_packet *);
725 
726 static inline int sctp_packet_empty(struct sctp_packet *packet)
727 {
728         return packet->size == packet->overhead;
729 }
730 
731 /* This represents a remote transport address.
732  * For local transport addresses, we just use union sctp_addr.
733  *
734  * RFC2960 Section 1.4 Key Terms
735  *
736  *   o  Transport address:  A Transport Address is traditionally defined
737  *      by Network Layer address, Transport Layer protocol and Transport
738  *      Layer port number.  In the case of SCTP running over IP, a
739  *      transport address is defined by the combination of an IP address
740  *      and an SCTP port number (where SCTP is the Transport protocol).
741  *
742  * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control
743  *
744  *   o  The sender keeps a separate congestion control parameter set for
745  *      each of the destination addresses it can send to (not each
746  *      source-destination pair but for each destination).  The parameters
747  *      should decay if the address is not used for a long enough time
748  *      period.
749  *
750  */
751 struct sctp_transport {
752         /* A list of transports. */
753         struct list_head transports;
754         struct rhash_head node;
755 
756         /* Reference counting. */
757         atomic_t refcnt;
758                 /* RTO-Pending : A flag used to track if one of the DATA
759                  *              chunks sent to this address is currently being
760                  *              used to compute a RTT. If this flag is 0,
761                  *              the next DATA chunk sent to this destination
762                  *              should be used to compute a RTT and this flag
763                  *              should be set. Every time the RTT
764                  *              calculation completes (i.e. the DATA chunk
765                  *              is SACK'd) clear this flag.
766                  */
767         __u32   rto_pending:1,
768 
769                 /*
770                  * hb_sent : a flag that signals that we have a pending
771                  * heartbeat.
772                  */
773                 hb_sent:1,
774 
775                 /* Is the Path MTU update pending on this tranport */
776                 pmtu_pending:1,
777 
778                 /* Has this transport moved the ctsn since we last sacked */
779                 sack_generation:1;
780         u32 dst_cookie;
781 
782         struct flowi fl;
783 
784         /* This is the peer's IP address and port. */
785         union sctp_addr ipaddr;
786 
787         /* These are the functions we call to handle LLP stuff.  */
788         struct sctp_af *af_specific;
789 
790         /* Which association do we belong to?  */
791         struct sctp_association *asoc;
792 
793         /* RFC2960
794          *
795          * 12.3 Per Transport Address Data
796          *
797          * For each destination transport address in the peer's
798          * address list derived from the INIT or INIT ACK chunk, a
799          * number of data elements needs to be maintained including:
800          */
801         /* RTO         : The current retransmission timeout value.  */
802         unsigned long rto;
803 
804         __u32 rtt;              /* This is the most recent RTT.  */
805 
806         /* RTTVAR      : The current RTT variation.  */
807         __u32 rttvar;
808 
809         /* SRTT        : The current smoothed round trip time.  */
810         __u32 srtt;
811 
812         /*
813          * These are the congestion stats.
814          */
815         /* cwnd        : The current congestion window.  */
816         __u32 cwnd;               /* This is the actual cwnd.  */
817 
818         /* ssthresh    : The current slow start threshold value.  */
819         __u32 ssthresh;
820 
821         /* partial     : The tracking method for increase of cwnd when in
822          * bytes acked : congestion avoidance mode (see Section 6.2.2)
823          */
824         __u32 partial_bytes_acked;
825 
826         /* Data that has been sent, but not acknowledged. */
827         __u32 flight_size;
828 
829         __u32 burst_limited;    /* Holds old cwnd when max.burst is applied */
830 
831         /* Destination */
832         struct dst_entry *dst;
833         /* Source address. */
834         union sctp_addr saddr;
835 
836         /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
837          * the destination address every heartbeat interval.
838          */
839         unsigned long hbinterval;
840 
841         /* SACK delay timeout */
842         unsigned long sackdelay;
843         __u32 sackfreq;
844 
845         /* When was the last time that we heard from this transport? We use
846          * this to pick new active and retran paths.
847          */
848         ktime_t last_time_heard;
849 
850         /* When was the last time that we sent a chunk using this
851          * transport? We use this to check for idle transports
852          */
853         unsigned long last_time_sent;
854 
855         /* Last time(in jiffies) when cwnd is reduced due to the congestion
856          * indication based on ECNE chunk.
857          */
858         unsigned long last_time_ecne_reduced;
859 
860         /* This is the max_retrans value for the transport and will
861          * be initialized from the assocs value.  This can be changed
862          * using the SCTP_SET_PEER_ADDR_PARAMS socket option.
863          */
864         __u16 pathmaxrxt;
865 
866         /* This is the partially failed retrans value for the transport
867          * and will be initialized from the assocs value.  This can be changed
868          * using the SCTP_PEER_ADDR_THLDS socket option
869          */
870         int pf_retrans;
871         /* PMTU       : The current known path MTU.  */
872         __u32 pathmtu;
873 
874         /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
875         __u32 param_flags;
876 
877         /* The number of times INIT has been sent on this transport. */
878         int init_sent_count;
879 
880         /* state       : The current state of this destination,
881          *             : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN.
882          */
883         int state;
884 
885         /* These are the error stats for this destination.  */
886 
887         /* Error count : The current error count for this destination.  */
888         unsigned short error_count;
889 
890         /* Per         : A timer used by each destination.
891          * Destination :
892          * Timer       :
893          *
894          * [Everywhere else in the text this is called T3-rtx. -ed]
895          */
896         struct timer_list T3_rtx_timer;
897 
898         /* Heartbeat timer is per destination. */
899         struct timer_list hb_timer;
900 
901         /* Timer to handle ICMP proto unreachable envets */
902         struct timer_list proto_unreach_timer;
903 
904         /* Since we're using per-destination retransmission timers
905          * (see above), we're also using per-destination "transmitted"
906          * queues.  This probably ought to be a private struct
907          * accessible only within the outqueue, but it's not, yet.
908          */
909         struct list_head transmitted;
910 
911         /* We build bundle-able packets for this transport here.  */
912         struct sctp_packet packet;
913 
914         /* This is the list of transports that have chunks to send.  */
915         struct list_head send_ready;
916 
917         /* State information saved for SFR_CACC algorithm. The key
918          * idea in SFR_CACC is to maintain state at the sender on a
919          * per-destination basis when a changeover happens.
920          *      char changeover_active;
921          *      char cycling_changeover;
922          *      __u32 next_tsn_at_change;
923          *      char cacc_saw_newack;
924          */
925         struct {
926                 /* An unsigned integer, which stores the next TSN to be
927                  * used by the sender, at the moment of changeover.
928                  */
929                 __u32 next_tsn_at_change;
930 
931                 /* A flag which indicates the occurrence of a changeover */
932                 char changeover_active;
933 
934                 /* A flag which indicates whether the change of primary is
935                  * the first switch to this destination address during an
936                  * active switch.
937                  */
938                 char cycling_changeover;
939 
940                 /* A temporary flag, which is used during the processing of
941                  * a SACK to estimate the causative TSN(s)'s group.
942                  */
943                 char cacc_saw_newack;
944         } cacc;
945 
946         /* 64-bit random number sent with heartbeat. */
947         __u64 hb_nonce;
948 
949         struct rcu_head rcu;
950 };
951 
952 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *,
953                                           gfp_t);
954 void sctp_transport_set_owner(struct sctp_transport *,
955                               struct sctp_association *);
956 void sctp_transport_route(struct sctp_transport *, union sctp_addr *,
957                           struct sctp_sock *);
958 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk);
959 void sctp_transport_free(struct sctp_transport *);
960 void sctp_transport_reset_t3_rtx(struct sctp_transport *);
961 void sctp_transport_reset_hb_timer(struct sctp_transport *);
962 int sctp_transport_hold(struct sctp_transport *);
963 void sctp_transport_put(struct sctp_transport *);
964 void sctp_transport_update_rto(struct sctp_transport *, __u32);
965 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32);
966 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t);
967 void sctp_transport_burst_limited(struct sctp_transport *);
968 void sctp_transport_burst_reset(struct sctp_transport *);
969 unsigned long sctp_transport_timeout(struct sctp_transport *);
970 void sctp_transport_reset(struct sctp_transport *);
971 void sctp_transport_update_pmtu(struct sock *, struct sctp_transport *, u32);
972 void sctp_transport_immediate_rtx(struct sctp_transport *);
973 
974 
975 /* This is the structure we use to queue packets as they come into
976  * SCTP.  We write packets to it and read chunks from it.
977  */
978 struct sctp_inq {
979         /* This is actually a queue of sctp_chunk each
980          * containing a partially decoded packet.
981          */
982         struct list_head in_chunk_list;
983         /* This is the packet which is currently off the in queue and is
984          * being worked on through the inbound chunk processing.
985          */
986         struct sctp_chunk *in_progress;
987 
988         /* This is the delayed task to finish delivering inbound
989          * messages.
990          */
991         struct work_struct immediate;
992 };
993 
994 void sctp_inq_init(struct sctp_inq *);
995 void sctp_inq_free(struct sctp_inq *);
996 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet);
997 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *);
998 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *);
999 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t);
1000 
1001 /* This is the structure we use to hold outbound chunks.  You push
1002  * chunks in and they automatically pop out the other end as bundled
1003  * packets (it calls (*output_handler)()).
1004  *
1005  * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1,
1006  * and 8.2 of the v13 draft.
1007  *
1008  * It handles retransmissions.  The connection to the timeout portion
1009  * of the state machine is through sctp_..._timeout() and timeout_handler.
1010  *
1011  * If you feed it SACKs, it will eat them.
1012  *
1013  * If you give it big chunks, it will fragment them.
1014  *
1015  * It assigns TSN's to data chunks.  This happens at the last possible
1016  * instant before transmission.
1017  *
1018  * When free()'d, it empties itself out via output_handler().
1019  */
1020 struct sctp_outq {
1021         struct sctp_association *asoc;
1022 
1023         /* Data pending that has never been transmitted.  */
1024         struct list_head out_chunk_list;
1025 
1026         unsigned int out_qlen;  /* Total length of queued data chunks. */
1027 
1028         /* Error of send failed, may used in SCTP_SEND_FAILED event. */
1029         unsigned int error;
1030 
1031         /* These are control chunks we want to send.  */
1032         struct list_head control_chunk_list;
1033 
1034         /* These are chunks that have been sacked but are above the
1035          * CTSN, or cumulative tsn ack point.
1036          */
1037         struct list_head sacked;
1038 
1039         /* Put chunks on this list to schedule them for
1040          * retransmission.
1041          */
1042         struct list_head retransmit;
1043 
1044         /* Put chunks on this list to save them for FWD TSN processing as
1045          * they were abandoned.
1046          */
1047         struct list_head abandoned;
1048 
1049         /* How many unackd bytes do we have in-flight?  */
1050         __u32 outstanding_bytes;
1051 
1052         /* Are we doing fast-rtx on this queue */
1053         char fast_rtx;
1054 
1055         /* Corked? */
1056         char cork;
1057 };
1058 
1059 void sctp_outq_init(struct sctp_association *, struct sctp_outq *);
1060 void sctp_outq_teardown(struct sctp_outq *);
1061 void sctp_outq_free(struct sctp_outq*);
1062 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t);
1063 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *);
1064 int sctp_outq_is_empty(const struct sctp_outq *);
1065 void sctp_outq_restart(struct sctp_outq *);
1066 
1067 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *,
1068                      sctp_retransmit_reason_t);
1069 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8);
1070 int sctp_outq_uncork(struct sctp_outq *, gfp_t gfp);
1071 /* Uncork and flush an outqueue.  */
1072 static inline void sctp_outq_cork(struct sctp_outq *q)
1073 {
1074         q->cork = 1;
1075 }
1076 
1077 /* These bind address data fields common between endpoints and associations */
1078 struct sctp_bind_addr {
1079 
1080         /* RFC 2960 12.1 Parameters necessary for the SCTP instance
1081          *
1082          * SCTP Port:   The local SCTP port number the endpoint is
1083          *              bound to.
1084          */
1085         __u16 port;
1086 
1087         /* RFC 2960 12.1 Parameters necessary for the SCTP instance
1088          *
1089          * Address List: The list of IP addresses that this instance
1090          *      has bound.  This information is passed to one's
1091          *      peer(s) in INIT and INIT ACK chunks.
1092          */
1093         struct list_head address_list;
1094 };
1095 
1096 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port);
1097 void sctp_bind_addr_free(struct sctp_bind_addr *);
1098 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest,
1099                         const struct sctp_bind_addr *src,
1100                         sctp_scope_t scope, gfp_t gfp,
1101                         int flags);
1102 int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
1103                         const struct sctp_bind_addr *src,
1104                         gfp_t gfp);
1105 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *,
1106                        int new_size, __u8 addr_state, gfp_t gfp);
1107 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *);
1108 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *,
1109                          struct sctp_sock *);
1110 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *,
1111                          struct sctp_sock *, struct sctp_sock *);
1112 int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
1113                          const union sctp_addr *addr);
1114 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr   *bp,
1115                                         const union sctp_addr   *addrs,
1116                                         int                     addrcnt,
1117                                         struct sctp_sock        *opt);
1118 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
1119                                          int *addrs_len,
1120                                          gfp_t gfp);
1121 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len,
1122                            __u16 port, gfp_t gfp);
1123 
1124 sctp_scope_t sctp_scope(const union sctp_addr *);
1125 int sctp_in_scope(struct net *net, const union sctp_addr *addr, const sctp_scope_t scope);
1126 int sctp_is_any(struct sock *sk, const union sctp_addr *addr);
1127 int sctp_is_ep_boundall(struct sock *sk);
1128 
1129 
1130 /* What type of endpoint?  */
1131 typedef enum {
1132         SCTP_EP_TYPE_SOCKET,
1133         SCTP_EP_TYPE_ASSOCIATION,
1134 } sctp_endpoint_type_t;
1135 
1136 /*
1137  * A common base class to bridge the implmentation view of a
1138  * socket (usually listening) endpoint versus an association's
1139  * local endpoint.
1140  * This common structure is useful for several purposes:
1141  *   1) Common interface for lookup routines.
1142  *      a) Subfunctions work for either endpoint or association
1143  *      b) Single interface to lookup allows hiding the lookup lock rather
1144  *         than acquiring it externally.
1145  *   2) Common interface for the inbound chunk handling/state machine.
1146  *   3) Common object handling routines for reference counting, etc.
1147  *   4) Disentangle association lookup from endpoint lookup, where we
1148  *      do not have to find our endpoint to find our association.
1149  *
1150  */
1151 
1152 struct sctp_ep_common {
1153         /* Fields to help us manage our entries in the hash tables. */
1154         struct hlist_node node;
1155         int hashent;
1156 
1157         /* Runtime type information.  What kind of endpoint is this? */
1158         sctp_endpoint_type_t type;
1159 
1160         /* Some fields to help us manage this object.
1161          *   refcnt   - Reference count access to this object.
1162          *   dead     - Do not attempt to use this object.
1163          */
1164         atomic_t    refcnt;
1165         bool        dead;
1166 
1167         /* What socket does this endpoint belong to?  */
1168         struct sock *sk;
1169 
1170         /* This is where we receive inbound chunks.  */
1171         struct sctp_inq   inqueue;
1172 
1173         /* This substructure includes the defining parameters of the
1174          * endpoint:
1175          * bind_addr.port is our shared port number.
1176          * bind_addr.address_list is our set of local IP addresses.
1177          */
1178         struct sctp_bind_addr bind_addr;
1179 };
1180 
1181 
1182 /* RFC Section 1.4 Key Terms
1183  *
1184  * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a
1185  *   multi-homed host, an SCTP endpoint is represented to its peers as a
1186  *   combination of a set of eligible destination transport addresses to
1187  *   which SCTP packets can be sent and a set of eligible source
1188  *   transport addresses from which SCTP packets can be received.
1189  *   All transport addresses used by an SCTP endpoint must use the
1190  *   same port number, but can use multiple IP addresses. A transport
1191  *   address used by an SCTP endpoint must not be used by another
1192  *   SCTP endpoint. In other words, a transport address is unique
1193  *   to an SCTP endpoint.
1194  *
1195  * From an implementation perspective, each socket has one of these.
1196  * A TCP-style socket will have exactly one association on one of
1197  * these.  An UDP-style socket will have multiple associations hanging
1198  * off one of these.
1199  */
1200 
1201 struct sctp_endpoint {
1202         /* Common substructure for endpoint and association. */
1203         struct sctp_ep_common base;
1204 
1205         /* Associations: A list of current associations and mappings
1206          *            to the data consumers for each association. This
1207          *            may be in the form of a hash table or other
1208          *            implementation dependent structure. The data
1209          *            consumers may be process identification
1210          *            information such as file descriptors, named pipe
1211          *            pointer, or table pointers dependent on how SCTP
1212          *            is implemented.
1213          */
1214         /* This is really a list of struct sctp_association entries. */
1215         struct list_head asocs;
1216 
1217         /* Secret Key: A secret key used by this endpoint to compute
1218          *            the MAC.  This SHOULD be a cryptographic quality
1219          *            random number with a sufficient length.
1220          *            Discussion in [RFC1750] can be helpful in
1221          *            selection of the key.
1222          */
1223         __u8 secret_key[SCTP_SECRET_SIZE];
1224 
1225         /* digest:  This is a digest of the sctp cookie.  This field is
1226          *          only used on the receive path when we try to validate
1227          *          that the cookie has not been tampered with.  We put
1228          *          this here so we pre-allocate this once and can re-use
1229          *          on every receive.
1230          */
1231         __u8 *digest;
1232  
1233         /* sendbuf acct. policy.        */
1234         __u32 sndbuf_policy;
1235 
1236         /* rcvbuf acct. policy. */
1237         __u32 rcvbuf_policy;
1238 
1239         /* SCTP AUTH: array of the HMACs that will be allocated
1240          * we need this per association so that we don't serialize
1241          */
1242         struct crypto_shash **auth_hmacs;
1243 
1244         /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */
1245          struct sctp_hmac_algo_param *auth_hmacs_list;
1246 
1247         /* SCTP-AUTH: chunks to authenticate encoded into parameter */
1248         struct sctp_chunks_param *auth_chunk_list;
1249 
1250         /* SCTP-AUTH: endpoint shared keys */
1251         struct list_head endpoint_shared_keys;
1252         __u16 active_key_id;
1253         __u8  auth_enable;
1254 };
1255 
1256 /* Recover the outter endpoint structure. */
1257 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base)
1258 {
1259         struct sctp_endpoint *ep;
1260 
1261         ep = container_of(base, struct sctp_endpoint, base);
1262         return ep;
1263 }
1264 
1265 /* These are function signatures for manipulating endpoints.  */
1266 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t);
1267 void sctp_endpoint_free(struct sctp_endpoint *);
1268 void sctp_endpoint_put(struct sctp_endpoint *);
1269 void sctp_endpoint_hold(struct sctp_endpoint *);
1270 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *);
1271 struct sctp_association *sctp_endpoint_lookup_assoc(
1272         const struct sctp_endpoint *ep,
1273         const union sctp_addr *paddr,
1274         struct sctp_transport **);
1275 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *,
1276                                 const union sctp_addr *);
1277 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *,
1278                                         struct net *, const union sctp_addr *);
1279 int sctp_has_association(struct net *net, const union sctp_addr *laddr,
1280                          const union sctp_addr *paddr);
1281 
1282 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
1283                      const struct sctp_association *asoc,
1284                      sctp_cid_t, sctp_init_chunk_t *peer_init,
1285                      struct sctp_chunk *chunk, struct sctp_chunk **err_chunk);
1286 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk,
1287                       const union sctp_addr *peer,
1288                       sctp_init_chunk_t *init, gfp_t gfp);
1289 __u32 sctp_generate_tag(const struct sctp_endpoint *);
1290 __u32 sctp_generate_tsn(const struct sctp_endpoint *);
1291 
1292 struct sctp_inithdr_host {
1293         __u32 init_tag;
1294         __u32 a_rwnd;
1295         __u16 num_outbound_streams;
1296         __u16 num_inbound_streams;
1297         __u32 initial_tsn;
1298 };
1299 
1300 /* SCTP_GET_ASSOC_STATS counters */
1301 struct sctp_priv_assoc_stats {
1302         /* Maximum observed rto in the association during subsequent
1303          * observations. Value is set to 0 if no RTO measurement took place
1304          * The transport where the max_rto was observed is returned in
1305          * obs_rto_ipaddr
1306          */
1307         struct sockaddr_storage obs_rto_ipaddr;
1308         __u64 max_obs_rto;
1309         /* Total In and Out SACKs received and sent */
1310         __u64 isacks;
1311         __u64 osacks;
1312         /* Total In and Out packets received and sent */
1313         __u64 opackets;
1314         __u64 ipackets;
1315         /* Total retransmitted chunks */
1316         __u64 rtxchunks;
1317         /* TSN received > next expected */
1318         __u64 outofseqtsns;
1319         /* Duplicate Chunks received */
1320         __u64 idupchunks;
1321         /* Gap Ack Blocks received */
1322         __u64 gapcnt;
1323         /* Unordered data chunks sent and received */
1324         __u64 ouodchunks;
1325         __u64 iuodchunks;
1326         /* Ordered data chunks sent and received */
1327         __u64 oodchunks;
1328         __u64 iodchunks;
1329         /* Control chunks sent and received */
1330         __u64 octrlchunks;
1331         __u64 ictrlchunks;
1332 };
1333 
1334 /* RFC2960
1335  *
1336  * 12. Recommended Transmission Control Block (TCB) Parameters
1337  *
1338  * This section details a recommended set of parameters that should
1339  * be contained within the TCB for an implementation. This section is
1340  * for illustrative purposes and should not be deemed as requirements
1341  * on an implementation or as an exhaustive list of all parameters
1342  * inside an SCTP TCB. Each implementation may need its own additional
1343  * parameters for optimization.
1344  */
1345 
1346 
1347 /* Here we have information about each individual association. */
1348 struct sctp_association {
1349 
1350         /* A base structure common to endpoint and association.
1351          * In this context, it represents the associations's view
1352          * of the local endpoint of the association.
1353          */
1354         struct sctp_ep_common base;
1355 
1356         /* Associations on the same socket. */
1357         struct list_head asocs;
1358 
1359         /* association id. */
1360         sctp_assoc_t assoc_id;
1361 
1362         /* This is our parent endpoint.  */
1363         struct sctp_endpoint *ep;
1364 
1365         /* These are those association elements needed in the cookie.  */
1366         struct sctp_cookie c;
1367 
1368         /* This is all information about our peer.  */
1369         struct {
1370                 /* transport_addr_list
1371                  *
1372                  * Peer        : A list of SCTP transport addresses that the
1373                  * Transport   : peer is bound to. This information is derived
1374                  * Address     : from the INIT or INIT ACK and is used to
1375                  * List        : associate an inbound packet with a given
1376                  *             : association. Normally this information is
1377                  *             : hashed or keyed for quick lookup and access
1378                  *             : of the TCB.
1379                  *             : The list is also initialized with the list
1380                  *             : of addresses passed with the sctp_connectx()
1381                  *             : call.
1382                  *
1383                  * It is a list of SCTP_transport's.
1384                  */
1385                 struct list_head transport_addr_list;
1386 
1387                 /* rwnd
1388                  *
1389                  * Peer Rwnd   : Current calculated value of the peer's rwnd.
1390                  */
1391                 __u32 rwnd;
1392 
1393                 /* transport_count
1394                  *
1395                  * Peer        : A count of the number of peer addresses
1396                  * Transport   : in the Peer Transport Address List.
1397                  * Address     :
1398                  * Count       :
1399                  */
1400                 __u16 transport_count;
1401 
1402                 /* port
1403                  *   The transport layer port number.
1404                  */
1405                 __u16 port;
1406 
1407                 /* primary_path
1408                  *
1409                  * Primary     : This is the current primary destination
1410                  * Path        : transport address of the peer endpoint.  It
1411                  *             : may also specify a source transport address
1412                  *             : on this endpoint.
1413                  *
1414                  * All of these paths live on transport_addr_list.
1415                  *
1416                  * At the bakeoffs, we discovered that the intent of
1417                  * primaryPath is that it only changes when the ULP
1418                  * asks to have it changed.  We add the activePath to
1419                  * designate the connection we are currently using to
1420                  * transmit new data and most control chunks.
1421                  */
1422                 struct sctp_transport *primary_path;
1423 
1424                 /* Cache the primary path address here, when we
1425                  * need a an address for msg_name.
1426                  */
1427                 union sctp_addr primary_addr;
1428 
1429                 /* active_path
1430                  *   The path that we are currently using to
1431                  *   transmit new data and most control chunks.
1432                  */
1433                 struct sctp_transport *active_path;
1434 
1435                 /* retran_path
1436                  *
1437                  * RFC2960 6.4 Multi-homed SCTP Endpoints
1438                  * ...
1439                  * Furthermore, when its peer is multi-homed, an
1440                  * endpoint SHOULD try to retransmit a chunk to an
1441                  * active destination transport address that is
1442                  * different from the last destination address to
1443                  * which the DATA chunk was sent.
1444                  */
1445                 struct sctp_transport *retran_path;
1446 
1447                 /* Pointer to last transport I have sent on.  */
1448                 struct sctp_transport *last_sent_to;
1449 
1450                 /* This is the last transport I have received DATA on.  */
1451                 struct sctp_transport *last_data_from;
1452 
1453                 /*
1454                  * Mapping  An array of bits or bytes indicating which out of
1455                  * Array    order TSN's have been received (relative to the
1456                  *          Last Rcvd TSN). If no gaps exist, i.e. no out of
1457                  *          order packets have been received, this array
1458                  *          will be set to all zero. This structure may be
1459                  *          in the form of a circular buffer or bit array.
1460                  *
1461                  * Last Rcvd   : This is the last TSN received in
1462                  * TSN         : sequence. This value is set initially by
1463                  *             : taking the peer's Initial TSN, received in
1464                  *             : the INIT or INIT ACK chunk, and subtracting
1465                  *             : one from it.
1466                  *
1467                  * Throughout most of the specification this is called the
1468                  * "Cumulative TSN ACK Point".  In this case, we
1469                  * ignore the advice in 12.2 in favour of the term
1470                  * used in the bulk of the text.  This value is hidden
1471                  * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn().
1472                  */
1473                 struct sctp_tsnmap tsn_map;
1474 
1475                 /* This mask is used to disable sending the ASCONF chunk
1476                  * with specified parameter to peer.
1477                  */
1478                 __be16 addip_disabled_mask;
1479 
1480                 /* These are capabilities which our peer advertised.  */
1481                 __u8    ecn_capable:1,      /* Can peer do ECN? */
1482                         ipv4_address:1,     /* Peer understands IPv4 addresses? */
1483                         ipv6_address:1,     /* Peer understands IPv6 addresses? */
1484                         hostname_address:1, /* Peer understands DNS addresses? */
1485                         asconf_capable:1,   /* Does peer support ADDIP? */
1486                         prsctp_capable:1,   /* Can peer do PR-SCTP? */
1487                         auth_capable:1;     /* Is peer doing SCTP-AUTH? */
1488 
1489                 /* sack_needed : This flag indicates if the next received
1490                  *             : packet is to be responded to with a
1491                  *             : SACK. This is initialized to 0.  When a packet
1492                  *             : is received sack_cnt is incremented. If this value
1493                  *             : reaches 2 or more, a SACK is sent and the
1494                  *             : value is reset to 0. Note: This is used only
1495                  *             : when no DATA chunks are received out of
1496                  *             : order.  When DATA chunks are out of order,
1497                  *             : SACK's are not delayed (see Section 6).
1498                  */
1499                 __u8    sack_needed:1,     /* Do we need to sack the peer? */
1500                         sack_generation:1,
1501                         zero_window_announced:1;
1502                 __u32   sack_cnt;
1503 
1504                 __u32   adaptation_ind;  /* Adaptation Code point. */
1505 
1506                 struct sctp_inithdr_host i;
1507                 void *cookie;
1508                 int cookie_len;
1509 
1510                 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk.
1511                  * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the
1512                  * Initial TSN Value minus 1
1513                  */
1514                 __u32 addip_serial;
1515 
1516                 /* SCTP-AUTH: We need to know pears random number, hmac list
1517                  * and authenticated chunk list.  All that is part of the
1518                  * cookie and these are just pointers to those locations
1519                  */
1520                 sctp_random_param_t *peer_random;
1521                 sctp_chunks_param_t *peer_chunks;
1522                 sctp_hmac_algo_param_t *peer_hmacs;
1523         } peer;
1524 
1525         /* State       : A state variable indicating what state the
1526          *             : association is in, i.e. COOKIE-WAIT,
1527          *             : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING,
1528          *             : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT.
1529          *
1530          *              Note: No "CLOSED" state is illustrated since if a
1531          *              association is "CLOSED" its TCB SHOULD be removed.
1532          *
1533          *              In this implementation we DO have a CLOSED
1534          *              state which is used during initiation and shutdown.
1535          *
1536          *              State takes values from SCTP_STATE_*.
1537          */
1538         sctp_state_t state;
1539 
1540         /* Overall     : The overall association error count.
1541          * Error Count : [Clear this any time I get something.]
1542          */
1543         int overall_error_count;
1544 
1545         /* The cookie life I award for any cookie.  */
1546         ktime_t cookie_life;
1547 
1548         /* These are the association's initial, max, and min RTO values.
1549          * These values will be initialized by system defaults, but can
1550          * be modified via the SCTP_RTOINFO socket option.
1551          */
1552         unsigned long rto_initial;
1553         unsigned long rto_max;
1554         unsigned long rto_min;
1555 
1556         /* Maximum number of new data packets that can be sent in a burst.  */
1557         int max_burst;
1558 
1559         /* This is the max_retrans value for the association.  This value will
1560          * be initialized initialized from system defaults, but can be
1561          * modified by the SCTP_ASSOCINFO socket option.
1562          */
1563         int max_retrans;
1564 
1565         /* This is the partially failed retrans value for the transport
1566          * and will be initialized from the assocs value.  This can be
1567          * changed using the SCTP_PEER_ADDR_THLDS socket option
1568          */
1569         int pf_retrans;
1570 
1571         /* Maximum number of times the endpoint will retransmit INIT  */
1572         __u16 max_init_attempts;
1573 
1574         /* How many times have we resent an INIT? */
1575         __u16 init_retries;
1576 
1577         /* The largest timeout or RTO value to use in attempting an INIT */
1578         unsigned long max_init_timeo;
1579 
1580         /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
1581          * the destination address every heartbeat interval. This value
1582          * will be inherited by all new transports.
1583          */
1584         unsigned long hbinterval;
1585 
1586         /* This is the max_retrans value for new transports in the
1587          * association.
1588          */
1589         __u16 pathmaxrxt;
1590 
1591         /* Flag that path mtu update is pending */
1592         __u8   pmtu_pending;
1593 
1594         /* Association : The smallest PMTU discovered for all of the
1595          * PMTU        : peer's transport addresses.
1596          */
1597         __u32 pathmtu;
1598 
1599         /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
1600         __u32 param_flags;
1601 
1602         __u32 sackfreq;
1603         /* SACK delay timeout */
1604         unsigned long sackdelay;
1605 
1606         unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES];
1607         struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES];
1608 
1609         /* Transport to which SHUTDOWN chunk was last sent.  */
1610         struct sctp_transport *shutdown_last_sent_to;
1611 
1612         /* Transport to which INIT chunk was last sent.  */
1613         struct sctp_transport *init_last_sent_to;
1614 
1615         /* How many times have we resent a SHUTDOWN */
1616         int shutdown_retries;
1617 
1618         /* Next TSN    : The next TSN number to be assigned to a new
1619          *             : DATA chunk.  This is sent in the INIT or INIT
1620          *             : ACK chunk to the peer and incremented each
1621          *             : time a DATA chunk is assigned a TSN
1622          *             : (normally just prior to transmit or during
1623          *             : fragmentation).
1624          */
1625         __u32 next_tsn;
1626 
1627         /*
1628          * Last Rcvd   : This is the last TSN received in sequence.  This value
1629          * TSN         : is set initially by taking the peer's Initial TSN,
1630          *             : received in the INIT or INIT ACK chunk, and
1631          *             : subtracting one from it.
1632          *
1633          * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point.
1634          */
1635 
1636         __u32 ctsn_ack_point;
1637 
1638         /* PR-SCTP Advanced.Peer.Ack.Point */
1639         __u32 adv_peer_ack_point;
1640 
1641         /* Highest TSN that is acknowledged by incoming SACKs. */
1642         __u32 highest_sacked;
1643 
1644         /* TSN marking the fast recovery exit point */
1645         __u32 fast_recovery_exit;
1646 
1647         /* Flag to track the current fast recovery state */
1648         __u8 fast_recovery;
1649 
1650         /* The number of unacknowledged data chunks.  Reported through
1651          * the SCTP_STATUS sockopt.
1652          */
1653         __u16 unack_data;
1654 
1655         /* The total number of data chunks that we've had to retransmit
1656          * as the result of a T3 timer expiration
1657          */
1658         __u32 rtx_data_chunks;
1659 
1660         /* This is the association's receive buffer space.  This value is used
1661          * to set a_rwnd field in an INIT or a SACK chunk.
1662          */
1663         __u32 rwnd;
1664 
1665         /* This is the last advertised value of rwnd over a SACK chunk. */
1666         __u32 a_rwnd;
1667 
1668         /* Number of bytes by which the rwnd has slopped.  The rwnd is allowed
1669          * to slop over a maximum of the association's frag_point.
1670          */
1671         __u32 rwnd_over;
1672 
1673         /* Keeps treack of rwnd pressure.  This happens when we have
1674          * a window, but not recevie buffer (i.e small packets).  This one
1675          * is releases slowly (1 PMTU at a time ).
1676          */
1677         __u32 rwnd_press;
1678 
1679         /* This is the sndbuf size in use for the association.
1680          * This corresponds to the sndbuf size for the association,
1681          * as specified in the sk->sndbuf.
1682          */
1683         int sndbuf_used;
1684 
1685         /* This is the amount of memory that this association has allocated
1686          * in the receive path at any given time.
1687          */
1688         atomic_t rmem_alloc;
1689 
1690         /* This is the wait queue head for send requests waiting on
1691          * the association sndbuf space.
1692          */
1693         wait_queue_head_t       wait;
1694 
1695         /* The message size at which SCTP fragmentation will occur. */
1696         __u32 frag_point;
1697         __u32 user_frag;
1698 
1699         /* Counter used to count INIT errors. */
1700         int init_err_counter;
1701 
1702         /* Count the number of INIT cycles (for doubling timeout). */
1703         int init_cycle;
1704 
1705         /* Default send parameters. */
1706         __u16 default_stream;
1707         __u16 default_flags;
1708         __u32 default_ppid;
1709         __u32 default_context;
1710         __u32 default_timetolive;
1711 
1712         /* Default receive parameters */
1713         __u32 default_rcv_context;
1714 
1715         /* This tracks outbound ssn for a given stream.  */
1716         struct sctp_ssnmap *ssnmap;
1717 
1718         /* All outbound chunks go through this structure.  */
1719         struct sctp_outq outqueue;
1720 
1721         /* A smart pipe that will handle reordering and fragmentation,
1722          * as well as handle passing events up to the ULP.
1723          */
1724         struct sctp_ulpq ulpq;
1725 
1726         /* Last TSN that caused an ECNE Chunk to be sent.  */
1727         __u32 last_ecne_tsn;
1728 
1729         /* Last TSN that caused a CWR Chunk to be sent.  */
1730         __u32 last_cwr_tsn;
1731 
1732         /* How many duplicated TSNs have we seen?  */
1733         int numduptsns;
1734 
1735         /* These are to support
1736          * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses
1737          *  and Enforcement of Flow and Message Limits"
1738          * <draft-ietf-tsvwg-addip-sctp-02.txt>
1739          * or "ADDIP" for short.
1740          */
1741 
1742 
1743 
1744         /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
1745          *
1746          * R1) One and only one ASCONF Chunk MAY be in transit and
1747          * unacknowledged at any one time.  If a sender, after sending
1748          * an ASCONF chunk, decides it needs to transfer another
1749          * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
1750          * returns from the previous ASCONF Chunk before sending a
1751          * subsequent ASCONF. Note this restriction binds each side,
1752          * so at any time two ASCONF may be in-transit on any given
1753          * association (one sent from each endpoint).
1754          *
1755          * [This is our one-and-only-one ASCONF in flight.  If we do
1756          * not have an ASCONF in flight, this is NULL.]
1757          */
1758         struct sctp_chunk *addip_last_asconf;
1759 
1760         /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk.
1761          *
1762          * This is needed to implement itmes E1 - E4 of the updated
1763          * spec.  Here is the justification:
1764          *
1765          * Since the peer may bundle multiple ASCONF chunks toward us,
1766          * we now need the ability to cache multiple ACKs.  The section
1767          * describes in detail how they are cached and cleaned up.
1768          */
1769         struct list_head asconf_ack_list;
1770 
1771         /* These ASCONF chunks are waiting to be sent.
1772          *
1773          * These chunaks can't be pushed to outqueue until receiving
1774          * ASCONF_ACK for the previous ASCONF indicated by
1775          * addip_last_asconf, so as to guarantee that only one ASCONF
1776          * is in flight at any time.
1777          *
1778          * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
1779          *
1780          * In defining the ASCONF Chunk transfer procedures, it is
1781          * essential that these transfers MUST NOT cause congestion
1782          * within the network.  To achieve this, we place these
1783          * restrictions on the transfer of ASCONF Chunks:
1784          *
1785          * R1) One and only one ASCONF Chunk MAY be in transit and
1786          * unacknowledged at any one time.  If a sender, after sending
1787          * an ASCONF chunk, decides it needs to transfer another
1788          * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
1789          * returns from the previous ASCONF Chunk before sending a
1790          * subsequent ASCONF. Note this restriction binds each side,
1791          * so at any time two ASCONF may be in-transit on any given
1792          * association (one sent from each endpoint).
1793          *
1794          *
1795          * [I really think this is EXACTLY the sort of intelligence
1796          *  which already resides in sctp_outq.  Please move this
1797          *  queue and its supporting logic down there.  --piggy]
1798          */
1799         struct list_head addip_chunk_list;
1800 
1801         /* ADDIP Section 4.1 ASCONF Chunk Procedures
1802          *
1803          * A2) A serial number should be assigned to the Chunk. The
1804          * serial number SHOULD be a monotonically increasing
1805          * number. The serial number SHOULD be initialized at
1806          * the start of the association to the same value as the
1807          * Initial TSN and every time a new ASCONF chunk is created
1808          * it is incremented by one after assigning the serial number
1809          * to the newly created chunk.
1810          *
1811          * ADDIP
1812          * 3.1.1  Address/Stream Configuration Change Chunk (ASCONF)
1813          *
1814          * Serial Number : 32 bits (unsigned integer)
1815          *
1816          * This value represents a Serial Number for the ASCONF
1817          * Chunk. The valid range of Serial Number is from 0 to
1818          * 4294967295 (2^32 - 1).  Serial Numbers wrap back to 0
1819          * after reaching 4294967295.
1820          */
1821         __u32 addip_serial;
1822         int src_out_of_asoc_ok;
1823         union sctp_addr *asconf_addr_del_pending;
1824         struct sctp_transport *new_transport;
1825 
1826         /* SCTP AUTH: list of the endpoint shared keys.  These
1827          * keys are provided out of band by the user applicaton
1828          * and can't change during the lifetime of the association
1829          */
1830         struct list_head endpoint_shared_keys;
1831 
1832         /* SCTP AUTH:
1833          * The current generated assocaition shared key (secret)
1834          */
1835         struct sctp_auth_bytes *asoc_shared_key;
1836 
1837         /* SCTP AUTH: hmac id of the first peer requested algorithm
1838          * that we support.
1839          */
1840         __u16 default_hmac_id;
1841 
1842         __u16 active_key_id;
1843 
1844         __u8 need_ecne:1,       /* Need to send an ECNE Chunk? */
1845              temp:1;            /* Is it a temporary association? */
1846 
1847         struct sctp_priv_assoc_stats stats;
1848 };
1849 
1850 
1851 /* An eyecatcher for determining if we are really looking at an
1852  * association data structure.
1853  */
1854 enum {
1855         SCTP_ASSOC_EYECATCHER = 0xa550c123,
1856 };
1857 
1858 /* Recover the outter association structure. */
1859 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base)
1860 {
1861         struct sctp_association *asoc;
1862 
1863         asoc = container_of(base, struct sctp_association, base);
1864         return asoc;
1865 }
1866 
1867 /* These are function signatures for manipulating associations.  */
1868 
1869 
1870 struct sctp_association *
1871 sctp_association_new(const struct sctp_endpoint *, const struct sock *,
1872                      sctp_scope_t scope, gfp_t gfp);
1873 void sctp_association_free(struct sctp_association *);
1874 void sctp_association_put(struct sctp_association *);
1875 void sctp_association_hold(struct sctp_association *);
1876 
1877 struct sctp_transport *sctp_assoc_choose_alter_transport(
1878         struct sctp_association *, struct sctp_transport *);
1879 void sctp_assoc_update_retran_path(struct sctp_association *);
1880 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *,
1881                                           const union sctp_addr *);
1882 int sctp_assoc_lookup_laddr(struct sctp_association *asoc,
1883                             const union sctp_addr *laddr);
1884 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *,
1885                                      const union sctp_addr *address,
1886                                      const gfp_t gfp,
1887                                      const int peer_state);
1888 void sctp_assoc_del_peer(struct sctp_association *asoc,
1889                          const union sctp_addr *addr);
1890 void sctp_assoc_rm_peer(struct sctp_association *asoc,
1891                          struct sctp_transport *peer);
1892 void sctp_assoc_control_transport(struct sctp_association *,
1893                                   struct sctp_transport *,
1894                                   sctp_transport_cmd_t, sctp_sn_error_t);
1895 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32);
1896 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *,
1897                                            struct net *,
1898                                            const union sctp_addr *,
1899                                            const union sctp_addr *);
1900 void sctp_assoc_migrate(struct sctp_association *, struct sock *);
1901 void sctp_assoc_update(struct sctp_association *old,
1902                        struct sctp_association *new);
1903 
1904 __u32 sctp_association_get_next_tsn(struct sctp_association *);
1905 
1906 void sctp_assoc_sync_pmtu(struct sock *, struct sctp_association *);
1907 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int);
1908 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int);
1909 void sctp_assoc_set_primary(struct sctp_association *,
1910                             struct sctp_transport *);
1911 void sctp_assoc_del_nonprimary_peers(struct sctp_association *,
1912                                     struct sctp_transport *);
1913 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *,
1914                                      sctp_scope_t, gfp_t);
1915 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *,
1916                                          struct sctp_cookie*,
1917                                          gfp_t gfp);
1918 int sctp_assoc_set_id(struct sctp_association *, gfp_t);
1919 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc);
1920 struct sctp_chunk *sctp_assoc_lookup_asconf_ack(
1921                                         const struct sctp_association *asoc,
1922                                         __be32 serial);
1923 void sctp_asconf_queue_teardown(struct sctp_association *asoc);
1924 
1925 int sctp_cmp_addr_exact(const union sctp_addr *ss1,
1926                         const union sctp_addr *ss2);
1927 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc);
1928 
1929 /* A convenience structure to parse out SCTP specific CMSGs. */
1930 typedef struct sctp_cmsgs {
1931         struct sctp_initmsg *init;
1932         struct sctp_sndrcvinfo *srinfo;
1933         struct sctp_sndinfo *sinfo;
1934 } sctp_cmsgs_t;
1935 
1936 /* Structure for tracking memory objects */
1937 typedef struct {
1938         char *label;
1939         atomic_t *counter;
1940 } sctp_dbg_objcnt_entry_t;
1941 
1942 #endif /* __sctp_structs_h__ */
1943 

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