include/net/sctp/structs.h

   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/socket.h>       /* linux/in.h needs this!!    */
  52 #include <linux/in.h>           /* We get struct sockaddr_in. */
  53 #include <linux/in6.h>          /* We get struct in6_addr     */
  54 #include <linux/ipv6.h>
  55 #include <asm/param.h>          /* We get MAXHOSTNAMELEN.     */
  56 #include <linux/atomic.h>               /* This gets us atomic counters.  */
  57 #include <linux/skbuff.h>       /* We need sk_buff_head. */
  58 #include <linux/workqueue.h>    /* We need tq_struct.    */
  59 #include <linux/sctp.h>         /* We need sctp* header structs.  */
  60 #include <net/sctp/auth.h>      /* We need auth specific structs */
  61
  62 /* A convenience structure for handling sockaddr structures.
  63  * We should wean ourselves off this.
  64  */
  65 union sctp_addr {
  66         struct sockaddr_in v4;
  67         struct sockaddr_in6 v6;
  68         struct sockaddr sa;
  69 };
  70
  71 /* Forward declarations for data structures. */
  72 struct sctp_globals;
  73 struct sctp_endpoint;
  74 struct sctp_association;
  75 struct sctp_transport;
  76 struct sctp_packet;
  77 struct sctp_chunk;
  78 struct sctp_inq;
  79 struct sctp_outq;
  80 struct sctp_bind_addr;
  81 struct sctp_ulpq;
  82 struct sctp_ep_common;
  83 struct sctp_ssnmap;
  84 struct crypto_hash;
  85
  86
  87 #include <net/sctp/tsnmap.h>
  88 #include <net/sctp/ulpevent.h>
  89 #include <net/sctp/ulpqueue.h>
  90
  91 /* Structures useful for managing bind/connect. */
  92
  93 struct sctp_bind_bucket {
  94         unsigned short  port;
  95         unsigned short  fastreuse;
  96         struct hlist_node       node;
  97         struct hlist_head       owner;
  98         struct net      *net;
  99 };
 100
 101 struct sctp_bind_hashbucket {
 102         spinlock_t      lock;
 103         struct hlist_head       chain;
 104 };
 105
 106 /* Used for hashing all associations.  */
 107 struct sctp_hashbucket {
 108         rwlock_t        lock;
 109         struct hlist_head       chain;
 110 } __attribute__((__aligned__(8)));
 111
 112
 113 /* The SCTP globals structure. */
 114 extern struct sctp_globals {
 115         /* This is a list of groups of functions for each address
 116          * family that we support.
 117          */
 118         struct list_head address_families;
 119
 120         /* This is the hash of all endpoints. */
 121         struct sctp_hashbucket *ep_hashtable;
 122         /* This is the hash of all associations. */
 123         struct sctp_hashbucket *assoc_hashtable;
 124         /* This is the sctp port control hash.  */
 125         struct sctp_bind_hashbucket *port_hashtable;
 126
 127         /* Sizes of above hashtables. */
 128         int ep_hashsize;
 129         int assoc_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_assoc_hashsize             (sctp_globals.assoc_hashsize)
 147 #define sctp_assoc_hashtable            (sctp_globals.assoc_hashtable)
 148 #define sctp_port_hashsize              (sctp_globals.port_hashsize)
 149 #define sctp_port_hashtable             (sctp_globals.port_hashtable)
 150 #define sctp_checksum_disable           (sctp_globals.checksum_disable)
 151
 152 /* SCTP Socket type: UDP or TCP style. */
 153 typedef enum {
 154         SCTP_SOCKET_UDP = 0,
 155         SCTP_SOCKET_UDP_HIGH_BANDWIDTH,
 156         SCTP_SOCKET_TCP
 157 } sctp_socket_type_t;
 158
 159 /* Per socket SCTP information. */
 160 struct sctp_sock {
 161         /* inet_sock has to be the first member of sctp_sock */
 162         struct inet_sock inet;
 163         /* What kind of a socket is this? */
 164         sctp_socket_type_t type;
 165
 166         /* PF_ family specific functions.  */
 167         struct sctp_pf *pf;
 168
 169         /* Access to HMAC transform. */
 170         struct crypto_hash *hmac;
 171         char *sctp_hmac_alg;
 172
 173         /* What is our base endpointer? */
 174         struct sctp_endpoint *ep;
 175
 176         struct sctp_bind_bucket *bind_hash;
 177         /* Various Socket Options.  */
 178         __u16 default_stream;
 179         __u32 default_ppid;
 180         __u16 default_flags;
 181         __u32 default_context;
 182         __u32 default_timetolive;
 183         __u32 default_rcv_context;
 184         int max_burst;
 185
 186         /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
 187          * the destination address every heartbeat interval. This value
 188          * will be inherited by all new associations.
 189          */
 190         __u32 hbinterval;
 191
 192         /* This is the max_retrans value for new associations. */
 193         __u16 pathmaxrxt;
 194
 195         /* The initial Path MTU to use for new associations. */
 196         __u32 pathmtu;
 197
 198         /* The default SACK delay timeout for new associations. */
 199         __u32 sackdelay;
 200         __u32 sackfreq;
 201
 202         /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
 203         __u32 param_flags;
 204
 205         struct sctp_initmsg initmsg;
 206         struct sctp_rtoinfo rtoinfo;
 207         struct sctp_paddrparams paddrparam;
 208         struct sctp_event_subscribe subscribe;
 209         struct sctp_assocparams assocparams;
 210         int user_frag;
 211         __u32 autoclose;
 212         __u8 nodelay;
 213         __u8 disable_fragments;
 214         __u8 v4mapped;
 215         __u8 frag_interleave;
 216         __u32 adaptation_ind;
 217         __u32 pd_point;
 218
 219         atomic_t pd_mode;
 220         /* Receive to here while partial delivery is in effect. */
 221         struct sk_buff_head pd_lobby;
 222         struct list_head auto_asconf_list;
 223         int do_auto_asconf;
 224 };
 225
 226 static inline struct sctp_sock *sctp_sk(const struct sock *sk)
 227 {
 228        return (struct sctp_sock *)sk;
 229 }
 230
 231 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp)
 232 {
 233        return (struct sock *)sp;
 234 }
 235
 236 #if IS_ENABLED(CONFIG_IPV6)
 237 struct sctp6_sock {
 238        struct sctp_sock  sctp;
 239        struct ipv6_pinfo inet6;
 240 };
 241 #endif /* CONFIG_IPV6 */
 242
 243
 244 /* This is our APPLICATION-SPECIFIC state cookie.
 245  * THIS IS NOT DICTATED BY THE SPECIFICATION.
 246  */
 247 /* These are the parts of an association which we send in the cookie.
 248  * Most of these are straight out of:
 249  * RFC2960 12.2 Parameters necessary per association (i.e. the TCB)
 250  *
 251  */
 252
 253 struct sctp_cookie {
 254
 255         /* My          : Tag expected in every inbound packet and sent
 256          * Verification: in the INIT or INIT ACK chunk.
 257          * Tag         :
 258          */
 259         __u32 my_vtag;
 260
 261         /* Peer's      : Tag expected in every outbound packet except
 262          * Verification: in the INIT chunk.
 263          * Tag         :
 264          */
 265         __u32 peer_vtag;
 266
 267         /* The rest of these are not from the spec, but really need to
 268          * be in the cookie.
 269          */
 270
 271         /* My Tie Tag  : Assist in discovering a restarting association. */
 272         __u32 my_ttag;
 273
 274         /* Peer's Tie Tag: Assist in discovering a restarting association. */
 275         __u32 peer_ttag;
 276
 277         /* When does this cookie expire? */
 278         ktime_t expiration;
 279
 280         /* Number of inbound/outbound streams which are set
 281          * and negotiated during the INIT process.
 282          */
 283         __u16 sinit_num_ostreams;
 284         __u16 sinit_max_instreams;
 285
 286         /* This is the first sequence number I used.  */
 287         __u32 initial_tsn;
 288
 289         /* This holds the originating address of the INIT packet.  */
 290         union sctp_addr peer_addr;
 291
 292         /* IG Section 2.35.3
 293          * Include the source port of the INIT-ACK
 294          */
 295         __u16           my_port;
 296
 297         __u8 prsctp_capable;
 298
 299         /* Padding for future use */
 300         __u8 padding;
 301
 302         __u32 adaptation_ind;
 303
 304         __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH];
 305         __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2];
 306         __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS];
 307
 308         /* This is a shim for my peer's INIT packet, followed by
 309          * a copy of the raw address list of the association.
 310          * The length of the raw address list is saved in the
 311          * raw_addr_list_len field, which will be used at the time when
 312          * the association TCB is re-constructed from the cookie.
 313          */
 314         __u32 raw_addr_list_len;
 315         struct sctp_init_chunk peer_init[0];
 316 };
 317
 318
 319 /* The format of our cookie that we send to our peer. */
 320 struct sctp_signed_cookie {
 321         __u8 signature[SCTP_SECRET_SIZE];
 322         __u32 __pad;            /* force sctp_cookie alignment to 64 bits */
 323         struct sctp_cookie c;
 324 } __packed;
 325
 326 /* This is another convenience type to allocate memory for address
 327  * params for the maximum size and pass such structures around
 328  * internally.
 329  */
 330 union sctp_addr_param {
 331         struct sctp_paramhdr p;
 332         struct sctp_ipv4addr_param v4;
 333         struct sctp_ipv6addr_param v6;
 334 };
 335
 336 /* A convenience type to allow walking through the various
 337  * parameters and avoid casting all over the place.
 338  */
 339 union sctp_params {
 340         void *v;
 341         struct sctp_paramhdr *p;
 342         struct sctp_cookie_preserve_param *life;
 343         struct sctp_hostname_param *dns;
 344         struct sctp_cookie_param *cookie;
 345         struct sctp_supported_addrs_param *sat;
 346         struct sctp_ipv4addr_param *v4;
 347         struct sctp_ipv6addr_param *v6;
 348         union sctp_addr_param *addr;
 349         struct sctp_adaptation_ind_param *aind;
 350         struct sctp_supported_ext_param *ext;
 351         struct sctp_random_param *random;
 352         struct sctp_chunks_param *chunks;
 353         struct sctp_hmac_algo_param *hmac_algo;
 354         struct sctp_addip_param *addip;
 355 };
 356
 357 /* RFC 2960.  Section 3.3.5 Heartbeat.
 358  *    Heartbeat Information: variable length
 359  *    The Sender-specific Heartbeat Info field should normally include
 360  *    information about the sender's current time when this HEARTBEAT
 361  *    chunk is sent and the destination transport address to which this
 362  *    HEARTBEAT is sent (see Section 8.3).
 363  */
 364 typedef struct sctp_sender_hb_info {
 365         struct sctp_paramhdr param_hdr;
 366         union sctp_addr daddr;
 367         unsigned long sent_at;
 368         __u64 hb_nonce;
 369 } __packed sctp_sender_hb_info_t;
 370
 371 /*
 372  *  RFC 2960 1.3.2 Sequenced Delivery within Streams
 373  *
 374  *  The term "stream" is used in SCTP to refer to a sequence of user
 375  *  messages that are to be delivered to the upper-layer protocol in
 376  *  order with respect to other messages within the same stream.  This is
 377  *  in contrast to its usage in TCP, where it refers to a sequence of
 378  *  bytes (in this document a byte is assumed to be eight bits).
 379  *  ...
 380  *
 381  *  This is the structure we use to track both our outbound and inbound
 382  *  SSN, or Stream Sequence Numbers.
 383  */
 384
 385 struct sctp_stream {
 386         __u16 *ssn;
 387         unsigned int len;
 388 };
 389
 390 struct sctp_ssnmap {
 391         struct sctp_stream in;
 392         struct sctp_stream out;
 393 };
 394
 395 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out,
 396                                     gfp_t gfp);
 397 void sctp_ssnmap_free(struct sctp_ssnmap *map);
 398 void sctp_ssnmap_clear(struct sctp_ssnmap *map);
 399
 400 /* What is the current SSN number for this stream? */
 401 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id)
 402 {
 403         return stream->ssn[id];
 404 }
 405
 406 /* Return the next SSN number for this stream.  */
 407 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id)
 408 {
 409         return stream->ssn[id]++;
 410 }
 411
 412 /* Skip over this ssn and all below. */
 413 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id,
 414                                  __u16 ssn)
 415 {
 416         stream->ssn[id] = ssn+1;
 417 }
 418
 419 /*
 420  * Pointers to address related SCTP functions.
 421  * (i.e. things that depend on the address family.)
 422  */
 423 struct sctp_af {
 424         int             (*sctp_xmit)    (struct sk_buff *skb,
 425                                          struct sctp_transport *);
 426         int             (*setsockopt)   (struct sock *sk,
 427                                          int level,
 428                                          int optname,
 429                                          char __user *optval,
 430                                          unsigned int optlen);
 431         int             (*getsockopt)   (struct sock *sk,
 432                                          int level,
 433                                          int optname,
 434                                          char __user *optval,
 435                                          int __user *optlen);
 436         int             (*compat_setsockopt)    (struct sock *sk,
 437                                          int level,
 438                                          int optname,
 439                                          char __user *optval,
 440                                          unsigned int optlen);
 441         int             (*compat_getsockopt)    (struct sock *sk,
 442                                          int level,
 443                                          int optname,
 444                                          char __user *optval,
 445                                          int __user *optlen);
 446         void            (*get_dst)      (struct sctp_transport *t,
 447                                          union sctp_addr *saddr,
 448                                          struct flowi *fl,
 449                                          struct sock *sk);
 450         void            (*get_saddr)    (struct sctp_sock *sk,
 451                                          struct sctp_transport *t,
 452                                          struct flowi *fl);
 453         void            (*copy_addrlist) (struct list_head *,
 454                                           struct net_device *);
 455         int             (*cmp_addr)     (const union sctp_addr *addr1,
 456                                          const union sctp_addr *addr2);
 457         void            (*addr_copy)    (union sctp_addr *dst,
 458                                          union sctp_addr *src);
 459         void            (*from_skb)     (union sctp_addr *,
 460                                          struct sk_buff *skb,
 461                                          int saddr);
 462         void            (*from_sk)      (union sctp_addr *,
 463                                          struct sock *sk);
 464         void            (*to_sk_saddr)  (union sctp_addr *,
 465                                          struct sock *sk);
 466         void            (*to_sk_daddr)  (union sctp_addr *,
 467                                          struct sock *sk);
 468         void            (*from_addr_param) (union sctp_addr *,
 469                                             union sctp_addr_param *,
 470                                             __be16 port, int iif);
 471         int             (*to_addr_param) (const union sctp_addr *,
 472                                           union sctp_addr_param *);
 473         int             (*addr_valid)   (union sctp_addr *,
 474                                          struct sctp_sock *,
 475                                          const struct sk_buff *);
 476         sctp_scope_t    (*scope) (union sctp_addr *);
 477         void            (*inaddr_any)   (union sctp_addr *, __be16);
 478         int             (*is_any)       (const union sctp_addr *);
 479         int             (*available)    (union sctp_addr *,
 480                                          struct sctp_sock *);
 481         int             (*skb_iif)      (const struct sk_buff *sk);
 482         int             (*is_ce)        (const struct sk_buff *sk);
 483         void            (*seq_dump_addr)(struct seq_file *seq,
 484                                          union sctp_addr *addr);
 485         void            (*ecn_capable)(struct sock *sk);
 486         __u16           net_header_len;
 487         int             sockaddr_len;
 488         sa_family_t     sa_family;
 489         struct list_head list;
 490 };
 491
 492 struct sctp_af *sctp_get_af_specific(sa_family_t);
 493 int sctp_register_af(struct sctp_af *);
 494
 495 /* Protocol family functions. */
 496 struct sctp_pf {
 497         void (*event_msgname)(struct sctp_ulpevent *, char *, int *);
 498         void (*skb_msgname)  (struct sk_buff *, char *, int *);
 499         int  (*af_supported) (sa_family_t, struct sctp_sock *);
 500         int  (*cmp_addr) (const union sctp_addr *,
 501                           const union sctp_addr *,
 502                           struct sctp_sock *);
 503         int  (*bind_verify) (struct sctp_sock *, union sctp_addr *);
 504         int  (*send_verify) (struct sctp_sock *, union sctp_addr *);
 505         int  (*supported_addrs)(const struct sctp_sock *, __be16 *);
 506         struct sock *(*create_accept_sk) (struct sock *sk,
 507                                           struct sctp_association *asoc);
 508         void (*addr_v4map) (struct sctp_sock *, union sctp_addr *);
 509         struct sctp_af *af;
 510 };
 511
 512
 513 /* Structure to track chunk fragments that have been acked, but peer
 514  * fragments of the same message have not.
 515  */
 516 struct sctp_datamsg {
 517         /* Chunks waiting to be submitted to lower layer. */
 518         struct list_head chunks;
 519         /* Reference counting. */
 520         atomic_t refcnt;
 521         /* When is this message no longer interesting to the peer? */
 522         unsigned long expires_at;
 523         /* Did the messenge fail to send? */
 524         int send_error;
 525         u8 send_failed:1,
 526            can_abandon:1,   /* can chunks from this message can be abandoned. */
 527            can_delay;       /* should this message be Nagle delayed */
 528 };
 529
 530 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *,
 531                                             struct sctp_sndrcvinfo *,
 532                                             struct msghdr *, int len);
 533 void sctp_datamsg_free(struct sctp_datamsg *);
 534 void sctp_datamsg_put(struct sctp_datamsg *);
 535 void sctp_chunk_fail(struct sctp_chunk *, int error);
 536 int sctp_chunk_abandoned(struct sctp_chunk *);
 537
 538 /* RFC2960 1.4 Key Terms
 539  *
 540  * o Chunk: A unit of information within an SCTP packet, consisting of
 541  * a chunk header and chunk-specific content.
 542  *
 543  * As a matter of convenience, we remember the SCTP common header for
 544  * each chunk as well as a few other header pointers...
 545  */
 546 struct sctp_chunk {
 547         struct list_head list;
 548
 549         atomic_t refcnt;
 550
 551         /* This is our link to the per-transport transmitted list.  */
 552         struct list_head transmitted_list;
 553
 554         /* This field is used by chunks that hold fragmented data.
 555          * For the first fragment this is the list that holds the rest of
 556          * fragments. For the remaining fragments, this is the link to the
 557          * frag_list maintained in the first fragment.
 558          */
 559         struct list_head frag_list;
 560
 561         /* This points to the sk_buff containing the actual data.  */
 562         struct sk_buff *skb;
 563
 564         /* These are the SCTP headers by reverse order in a packet.
 565          * Note that some of these may happen more than once.  In that
 566          * case, we point at the "current" one, whatever that means
 567          * for that level of header.
 568          */
 569
 570         /* We point this at the FIRST TLV parameter to chunk_hdr.  */
 571         union sctp_params param_hdr;
 572         union {
 573                 __u8 *v;
 574                 struct sctp_datahdr *data_hdr;
 575                 struct sctp_inithdr *init_hdr;
 576                 struct sctp_sackhdr *sack_hdr;
 577                 struct sctp_heartbeathdr *hb_hdr;
 578                 struct sctp_sender_hb_info *hbs_hdr;
 579                 struct sctp_shutdownhdr *shutdown_hdr;
 580                 struct sctp_signed_cookie *cookie_hdr;
 581                 struct sctp_ecnehdr *ecne_hdr;
 582                 struct sctp_cwrhdr *ecn_cwr_hdr;
 583                 struct sctp_errhdr *err_hdr;
 584                 struct sctp_addiphdr *addip_hdr;
 585                 struct sctp_fwdtsn_hdr *fwdtsn_hdr;
 586                 struct sctp_authhdr *auth_hdr;
 587         } subh;
 588
 589         __u8 *chunk_end;
 590
 591         struct sctp_chunkhdr *chunk_hdr;
 592         struct sctphdr *sctp_hdr;
 593
 594         /* This needs to be recoverable for SCTP_SEND_FAILED events. */
 595         struct sctp_sndrcvinfo sinfo;
 596
 597         /* Which association does this belong to?  */
 598         struct sctp_association *asoc;
 599
 600         /* What endpoint received this chunk? */
 601         struct sctp_ep_common *rcvr;
 602
 603         /* We fill this in if we are calculating RTT. */
 604         unsigned long sent_at;
 605
 606         /* What is the origin IP address for this chunk?  */
 607         union sctp_addr source;
 608         /* Destination address for this chunk. */
 609         union sctp_addr dest;
 610
 611         /* For outbound message, track all fragments for SEND_FAILED. */
 612         struct sctp_datamsg *msg;
 613
 614         /* For an inbound chunk, this tells us where it came from.
 615          * For an outbound chunk, it tells us where we'd like it to
 616          * go.  It is NULL if we have no preference.
 617          */
 618         struct sctp_transport *transport;
 619
 620         /* SCTP-AUTH:  For the special case inbound processing of COOKIE-ECHO
 621          * we need save a pointer to the AUTH chunk, since the SCTP-AUTH
 622          * spec violates the principle premis that all chunks are processed
 623          * in order.
 624          */
 625         struct sk_buff *auth_chunk;
 626
 627 #define SCTP_CAN_FRTX 0x0
 628 #define SCTP_NEED_FRTX 0x1
 629 #define SCTP_DONT_FRTX 0x2
 630         __u16   rtt_in_progress:1,      /* This chunk used for RTT calc? */
 631                 resent:1,               /* Has this chunk ever been resent. */
 632                 has_tsn:1,              /* Does this chunk have a TSN yet? */
 633                 has_ssn:1,              /* Does this chunk have a SSN yet? */
 634                 singleton:1,            /* Only chunk in the packet? */
 635                 end_of_packet:1,        /* Last chunk in the packet? */
 636                 ecn_ce_done:1,          /* Have we processed the ECN CE bit? */
 637                 pdiscard:1,             /* Discard the whole packet now? */
 638                 tsn_gap_acked:1,        /* Is this chunk acked by a GAP ACK? */
 639                 data_accepted:1,        /* At least 1 chunk accepted */
 640                 auth:1,                 /* IN: was auth'ed | OUT: needs auth */
 641                 has_asconf:1,           /* IN: have seen an asconf before */
 642                 tsn_missing_report:2,   /* Data chunk missing counter. */
 643                 fast_retransmit:2;      /* Is this chunk fast retransmitted? */
 644 };
 645
 646 void sctp_chunk_hold(struct sctp_chunk *);
 647 void sctp_chunk_put(struct sctp_chunk *);
 648 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
 649                           struct iovec *data);
 650 void sctp_chunk_free(struct sctp_chunk *);
 651 void  *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data);
 652 struct sctp_chunk *sctp_chunkify(struct sk_buff *,
 653                                  const struct sctp_association *,
 654                                  struct sock *);
 655 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *,
 656                      union sctp_addr *);
 657 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk);
 658
 659 enum {
 660         SCTP_ADDR_NEW,          /* new address added to assoc/ep */
 661         SCTP_ADDR_SRC,          /* address can be used as source */
 662         SCTP_ADDR_DEL,          /* address about to be deleted */
 663 };
 664
 665 /* This is a structure for holding either an IPv6 or an IPv4 address.  */
 666 struct sctp_sockaddr_entry {
 667         struct list_head list;
 668         struct rcu_head rcu;
 669         union sctp_addr a;
 670         __u8 state;
 671         __u8 valid;
 672 };
 673
 674 #define SCTP_ADDRESS_TICK_DELAY 500
 675
 676 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *);
 677
 678 /* This structure holds lists of chunks as we are assembling for
 679  * transmission.
 680  */
 681 struct sctp_packet {
 682         /* These are the SCTP header values (host order) for the packet. */
 683         __u16 source_port;
 684         __u16 destination_port;
 685         __u32 vtag;
 686
 687         /* This contains the payload chunks.  */
 688         struct list_head chunk_list;
 689
 690         /* This is the overhead of the sctp and ip headers. */
 691         size_t overhead;
 692         /* This is the total size of all chunks INCLUDING padding.  */
 693         size_t size;
 694
 695         /* The packet is destined for this transport address.
 696          * The function we finally use to pass down to the next lower
 697          * layer lives in the transport structure.
 698          */
 699         struct sctp_transport *transport;
 700
 701         /* pointer to the auth chunk for this packet */
 702         struct sctp_chunk *auth;
 703
 704         u8  has_cookie_echo:1,  /* This packet contains a COOKIE-ECHO chunk. */
 705             has_sack:1,         /* This packet contains a SACK chunk. */
 706             has_auth:1,         /* This packet contains an AUTH chunk */
 707             has_data:1,         /* This packet contains at least 1 DATA chunk */
 708             ipfragok:1;         /* So let ip fragment this packet */
 709 };
 710
 711 struct sctp_packet *sctp_packet_init(struct sctp_packet *,
 712                                      struct sctp_transport *,
 713                                      __u16 sport, __u16 dport);
 714 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int);
 715 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *,
 716                                        struct sctp_chunk *, int);
 717 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *,
 718                                      struct sctp_chunk *);
 719 int sctp_packet_transmit(struct sctp_packet *);
 720 void sctp_packet_free(struct sctp_packet *);
 721
 722 static inline int sctp_packet_empty(struct sctp_packet *packet)
 723 {
 724         return packet->size == packet->overhead;
 725 }
 726
 727 /* This represents a remote transport address.
 728  * For local transport addresses, we just use union sctp_addr.
 729  *
 730  * RFC2960 Section 1.4 Key Terms
 731  *
 732  *   o  Transport address:  A Transport Address is traditionally defined
 733  *      by Network Layer address, Transport Layer protocol and Transport
 734  *      Layer port number.  In the case of SCTP running over IP, a
 735  *      transport address is defined by the combination of an IP address
 736  *      and an SCTP port number (where SCTP is the Transport protocol).
 737  *
 738  * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control
 739  *
 740  *   o  The sender keeps a separate congestion control parameter set for
 741  *      each of the destination addresses it can send to (not each
 742  *      source-destination pair but for each destination).  The parameters
 743  *      should decay if the address is not used for a long enough time
 744  *      period.
 745  *
 746  */
 747 struct sctp_transport {
 748         /* A list of transports. */
 749         struct list_head transports;
 750
 751         /* Reference counting. */
 752         atomic_t refcnt;
 753         __u32    dead:1,
 754                 /* RTO-Pending : A flag used to track if one of the DATA
 755                  *              chunks sent to this address is currently being
 756                  *              used to compute a RTT. If this flag is 0,
 757                  *              the next DATA chunk sent to this destination
 758                  *              should be used to compute a RTT and this flag
 759                  *              should be set. Every time the RTT
 760                  *              calculation completes (i.e. the DATA chunk
 761                  *              is SACK'd) clear this flag.
 762                  */
 763                  rto_pending:1,
 764
 765                 /*
 766                  * hb_sent : a flag that signals that we have a pending
 767                  * heartbeat.
 768                  */
 769                 hb_sent:1,
 770
 771                 /* Is the Path MTU update pending on this tranport */
 772                 pmtu_pending:1;
 773
 774         /* Has this transport moved the ctsn since we last sacked */
 775         __u32 sack_generation;
 776         u32 dst_cookie;
 777
 778         struct flowi fl;
 779
 780         /* This is the peer's IP address and port. */
 781         union sctp_addr ipaddr;
 782
 783         /* These are the functions we call to handle LLP stuff.  */
 784         struct sctp_af *af_specific;
 785
 786         /* Which association do we belong to?  */
 787         struct sctp_association *asoc;
 788
 789         /* RFC2960
 790          *
 791          * 12.3 Per Transport Address Data
 792          *
 793          * For each destination transport address in the peer's
 794          * address list derived from the INIT or INIT ACK chunk, a
 795          * number of data elements needs to be maintained including:
 796          */
 797         /* RTO         : The current retransmission timeout value.  */
 798         unsigned long rto;
 799
 800         __u32 rtt;              /* This is the most recent RTT.  */
 801
 802         /* RTTVAR      : The current RTT variation.  */
 803         __u32 rttvar;
 804
 805         /* SRTT        : The current smoothed round trip time.  */
 806         __u32 srtt;
 807
 808         /*
 809          * These are the congestion stats.
 810          */
 811         /* cwnd        : The current congestion window.  */
 812         __u32 cwnd;               /* This is the actual cwnd.  */
 813
 814         /* ssthresh    : The current slow start threshold value.  */
 815         __u32 ssthresh;
 816
 817         /* partial     : The tracking method for increase of cwnd when in
 818          * bytes acked : congestion avoidance mode (see Section 6.2.2)
 819          */
 820         __u32 partial_bytes_acked;
 821
 822         /* Data that has been sent, but not acknowledged. */
 823         __u32 flight_size;
 824
 825         __u32 burst_limited;    /* Holds old cwnd when max.burst is applied */
 826
 827         /* Destination */
 828         struct dst_entry *dst;
 829         /* Source address. */
 830         union sctp_addr saddr;
 831
 832         /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
 833          * the destination address every heartbeat interval.
 834          */
 835         unsigned long hbinterval;
 836
 837         /* SACK delay timeout */
 838         unsigned long sackdelay;
 839         __u32 sackfreq;
 840
 841         /* When was the last time (in jiffies) that we heard from this
 842          * transport?  We use this to pick new active and retran paths.
 843          */
 844         unsigned long last_time_heard;
 845
 846         /* Last time(in jiffies) when cwnd is reduced due to the congestion
 847          * indication based on ECNE chunk.
 848          */
 849         unsigned long last_time_ecne_reduced;
 850
 851         /* This is the max_retrans value for the transport and will
 852          * be initialized from the assocs value.  This can be changed
 853          * using the SCTP_SET_PEER_ADDR_PARAMS socket option.
 854          */
 855         __u16 pathmaxrxt;
 856
 857         /* This is the partially failed retrans value for the transport
 858          * and will be initialized from the assocs value.  This can be changed
 859          * using the SCTP_PEER_ADDR_THLDS socket option
 860          */
 861         int pf_retrans;
 862         /* PMTU       : The current known path MTU.  */
 863         __u32 pathmtu;
 864
 865         /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
 866         __u32 param_flags;
 867
 868         /* The number of times INIT has been sent on this transport. */
 869         int init_sent_count;
 870
 871         /* state       : The current state of this destination,
 872          *             : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN.
 873          */
 874         int state;
 875
 876         /* These are the error stats for this destination.  */
 877
 878         /* Error count : The current error count for this destination.  */
 879         unsigned short error_count;
 880
 881         /* Per         : A timer used by each destination.
 882          * Destination :
 883          * Timer       :
 884          *
 885          * [Everywhere else in the text this is called T3-rtx. -ed]
 886          */
 887         struct timer_list T3_rtx_timer;
 888
 889         /* Heartbeat timer is per destination. */
 890         struct timer_list hb_timer;
 891
 892         /* Timer to handle ICMP proto unreachable envets */
 893         struct timer_list proto_unreach_timer;
 894
 895         /* Since we're using per-destination retransmission timers
 896          * (see above), we're also using per-destination "transmitted"
 897          * queues.  This probably ought to be a private struct
 898          * accessible only within the outqueue, but it's not, yet.
 899          */
 900         struct list_head transmitted;
 901
 902         /* We build bundle-able packets for this transport here.  */
 903         struct sctp_packet packet;
 904
 905         /* This is the list of transports that have chunks to send.  */
 906         struct list_head send_ready;
 907
 908         /* State information saved for SFR_CACC algorithm. The key
 909          * idea in SFR_CACC is to maintain state at the sender on a
 910          * per-destination basis when a changeover happens.
 911          *      char changeover_active;
 912          *      char cycling_changeover;
 913          *      __u32 next_tsn_at_change;
 914          *      char cacc_saw_newack;
 915          */
 916         struct {
 917                 /* An unsigned integer, which stores the next TSN to be
 918                  * used by the sender, at the moment of changeover.
 919                  */
 920                 __u32 next_tsn_at_change;
 921
 922                 /* A flag which indicates the occurrence of a changeover */
 923                 char changeover_active;
 924
 925                 /* A flag which indicates whether the change of primary is
 926                  * the first switch to this destination address during an
 927                  * active switch.
 928                  */
 929                 char cycling_changeover;
 930
 931                 /* A temporary flag, which is used during the processing of
 932                  * a SACK to estimate the causative TSN(s)'s group.
 933                  */
 934                 char cacc_saw_newack;
 935         } cacc;
 936
 937         /* 64-bit random number sent with heartbeat. */
 938         __u64 hb_nonce;
 939
 940         struct rcu_head rcu;
 941 };
 942
 943 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *,
 944                                           gfp_t);
 945 void sctp_transport_set_owner(struct sctp_transport *,
 946                               struct sctp_association *);
 947 void sctp_transport_route(struct sctp_transport *, union sctp_addr *,
 948                           struct sctp_sock *);
 949 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk);
 950 void sctp_transport_free(struct sctp_transport *);
 951 void sctp_transport_reset_timers(struct sctp_transport *);
 952 void sctp_transport_hold(struct sctp_transport *);
 953 void sctp_transport_put(struct sctp_transport *);
 954 void sctp_transport_update_rto(struct sctp_transport *, __u32);
 955 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32);
 956 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t);
 957 void sctp_transport_burst_limited(struct sctp_transport *);
 958 void sctp_transport_burst_reset(struct sctp_transport *);
 959 unsigned long sctp_transport_timeout(struct sctp_transport *);
 960 void sctp_transport_reset(struct sctp_transport *);
 961 void sctp_transport_update_pmtu(struct sock *, struct sctp_transport *, u32);
 962 void sctp_transport_immediate_rtx(struct sctp_transport *);
 963
 964
 965 /* This is the structure we use to queue packets as they come into
 966  * SCTP.  We write packets to it and read chunks from it.
 967  */
 968 struct sctp_inq {
 969         /* This is actually a queue of sctp_chunk each
 970          * containing a partially decoded packet.
 971          */
 972         struct list_head in_chunk_list;
 973         /* This is the packet which is currently off the in queue and is
 974          * being worked on through the inbound chunk processing.
 975          */
 976         struct sctp_chunk *in_progress;
 977
 978         /* This is the delayed task to finish delivering inbound
 979          * messages.
 980          */
 981         struct work_struct immediate;
 982 };
 983
 984 void sctp_inq_init(struct sctp_inq *);
 985 void sctp_inq_free(struct sctp_inq *);
 986 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet);
 987 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *);
 988 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *);
 989 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t);
 990
 991 /* This is the structure we use to hold outbound chunks.  You push
 992  * chunks in and they automatically pop out the other end as bundled
 993  * packets (it calls (*output_handler)()).
 994  *
 995  * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1,
 996  * and 8.2 of the v13 draft.
 997  *
 998  * It handles retransmissions.  The connection to the timeout portion
 999  * of the state machine is through sctp_..._timeout() and timeout_handler.
1000  *
1001  * If you feed it SACKs, it will eat them.
1002  *
1003  * If you give it big chunks, it will fragment them.
1004  *
1005  * It assigns TSN's to data chunks.  This happens at the last possible
1006  * instant before transmission.
1007  *
1008  * When free()'d, it empties itself out via output_handler().
1009  */
1010 struct sctp_outq {
1011         struct sctp_association *asoc;
1012
1013         /* Data pending that has never been transmitted.  */
1014         struct list_head out_chunk_list;
1015
1016         unsigned int out_qlen;  /* Total length of queued data chunks. */
1017
1018         /* Error of send failed, may used in SCTP_SEND_FAILED event. */
1019         unsigned int error;
1020
1021         /* These are control chunks we want to send.  */
1022         struct list_head control_chunk_list;
1023
1024         /* These are chunks that have been sacked but are above the
1025          * CTSN, or cumulative tsn ack point.
1026          */
1027         struct list_head sacked;
1028
1029         /* Put chunks on this list to schedule them for
1030          * retransmission.
1031          */
1032         struct list_head retransmit;
1033
1034         /* Put chunks on this list to save them for FWD TSN processing as
1035          * they were abandoned.
1036          */
1037         struct list_head abandoned;
1038
1039         /* How many unackd bytes do we have in-flight?  */
1040         __u32 outstanding_bytes;
1041
1042         /* Are we doing fast-rtx on this queue */
1043         char fast_rtx;
1044
1045         /* Corked? */
1046         char cork;
1047 };
1048
1049 void sctp_outq_init(struct sctp_association *, struct sctp_outq *);
1050 void sctp_outq_teardown(struct sctp_outq *);
1051 void sctp_outq_free(struct sctp_outq*);
1052 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk);
1053 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *);
1054 int sctp_outq_is_empty(const struct sctp_outq *);
1055 void sctp_outq_restart(struct sctp_outq *);
1056
1057 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *,
1058                      sctp_retransmit_reason_t);
1059 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8);
1060 int sctp_outq_uncork(struct sctp_outq *);
1061 /* Uncork and flush an outqueue.  */
1062 static inline void sctp_outq_cork(struct sctp_outq *q)
1063 {
1064         q->cork = 1;
1065 }
1066
1067 /* These bind address data fields common between endpoints and associations */
1068 struct sctp_bind_addr {
1069
1070         /* RFC 2960 12.1 Parameters necessary for the SCTP instance
1071          *
1072          * SCTP Port:   The local SCTP port number the endpoint is
1073          *              bound to.
1074          */
1075         __u16 port;
1076
1077         /* RFC 2960 12.1 Parameters necessary for the SCTP instance
1078          *
1079          * Address List: The list of IP addresses that this instance
1080          *      has bound.  This information is passed to one's
1081          *      peer(s) in INIT and INIT ACK chunks.
1082          */
1083         struct list_head address_list;
1084 };
1085
1086 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port);
1087 void sctp_bind_addr_free(struct sctp_bind_addr *);
1088 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest,
1089                         const struct sctp_bind_addr *src,
1090                         sctp_scope_t scope, gfp_t gfp,
1091                         int flags);
1092 int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
1093                         const struct sctp_bind_addr *src,
1094                         gfp_t gfp);
1095 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *,
1096                        __u8 addr_state, gfp_t gfp);
1097 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *);
1098 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *,
1099                          struct sctp_sock *);
1100 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *,
1101                          struct sctp_sock *, struct sctp_sock *);
1102 int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
1103                          const union sctp_addr *addr);
1104 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr   *bp,
1105                                         const union sctp_addr   *addrs,
1106                                         int                     addrcnt,
1107                                         struct sctp_sock        *opt);
1108 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
1109                                          int *addrs_len,
1110                                          gfp_t gfp);
1111 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len,
1112                            __u16 port, gfp_t gfp);
1113
1114 sctp_scope_t sctp_scope(const union sctp_addr *);
1115 int sctp_in_scope(struct net *net, const union sctp_addr *addr, const sctp_scope_t scope);
1116 int sctp_is_any(struct sock *sk, const union sctp_addr *addr);
1117 int sctp_addr_is_valid(const union sctp_addr *addr);
1118 int sctp_is_ep_boundall(struct sock *sk);
1119
1120
1121 /* What type of endpoint?  */
1122 typedef enum {
1123         SCTP_EP_TYPE_SOCKET,
1124         SCTP_EP_TYPE_ASSOCIATION,
1125 } sctp_endpoint_type_t;
1126
1127 /*
1128  * A common base class to bridge the implmentation view of a
1129  * socket (usually listening) endpoint versus an association's
1130  * local endpoint.
1131  * This common structure is useful for several purposes:
1132  *   1) Common interface for lookup routines.
1133  *      a) Subfunctions work for either endpoint or association
1134  *      b) Single interface to lookup allows hiding the lookup lock rather
1135  *         than acquiring it externally.
1136  *   2) Common interface for the inbound chunk handling/state machine.
1137  *   3) Common object handling routines for reference counting, etc.
1138  *   4) Disentangle association lookup from endpoint lookup, where we
1139  *      do not have to find our endpoint to find our association.
1140  *
1141  */
1142
1143 struct sctp_ep_common {
1144         /* Fields to help us manage our entries in the hash tables. */
1145         struct hlist_node node;
1146         int hashent;
1147
1148         /* Runtime type information.  What kind of endpoint is this? */
1149         sctp_endpoint_type_t type;
1150
1151         /* Some fields to help us manage this object.
1152          *   refcnt   - Reference count access to this object.
1153          *   dead     - Do not attempt to use this object.
1154          */
1155         atomic_t    refcnt;
1156         bool        dead;
1157
1158         /* What socket does this endpoint belong to?  */
1159         struct sock *sk;
1160
1161         /* This is where we receive inbound chunks.  */
1162         struct sctp_inq   inqueue;
1163
1164         /* This substructure includes the defining parameters of the
1165          * endpoint:
1166          * bind_addr.port is our shared port number.
1167          * bind_addr.address_list is our set of local IP addresses.
1168          */
1169         struct sctp_bind_addr bind_addr;
1170 };
1171
1172
1173 /* RFC Section 1.4 Key Terms
1174  *
1175  * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a
1176  *   multi-homed host, an SCTP endpoint is represented to its peers as a
1177  *   combination of a set of eligible destination transport addresses to
1178  *   which SCTP packets can be sent and a set of eligible source
1179  *   transport addresses from which SCTP packets can be received.
1180  *   All transport addresses used by an SCTP endpoint must use the
1181  *   same port number, but can use multiple IP addresses. A transport
1182  *   address used by an SCTP endpoint must not be used by another
1183  *   SCTP endpoint. In other words, a transport address is unique
1184  *   to an SCTP endpoint.
1185  *
1186  * From an implementation perspective, each socket has one of these.
1187  * A TCP-style socket will have exactly one association on one of
1188  * these.  An UDP-style socket will have multiple associations hanging
1189  * off one of these.
1190  */
1191
1192 struct sctp_endpoint {
1193         /* Common substructure for endpoint and association. */
1194         struct sctp_ep_common base;
1195
1196         /* Associations: A list of current associations and mappings
1197          *            to the data consumers for each association. This
1198          *            may be in the form of a hash table or other
1199          *            implementation dependent structure. The data
1200          *            consumers may be process identification
1201          *            information such as file descriptors, named pipe
1202          *            pointer, or table pointers dependent on how SCTP
1203          *            is implemented.
1204          */
1205         /* This is really a list of struct sctp_association entries. */
1206         struct list_head asocs;
1207
1208         /* Secret Key: A secret key used by this endpoint to compute
1209          *            the MAC.  This SHOULD be a cryptographic quality
1210          *            random number with a sufficient length.
1211          *            Discussion in [RFC1750] can be helpful in
1212          *            selection of the key.
1213          */
1214         __u8 secret_key[SCTP_SECRET_SIZE];
1215
1216         /* digest:  This is a digest of the sctp cookie.  This field is
1217          *          only used on the receive path when we try to validate
1218          *          that the cookie has not been tampered with.  We put
1219          *          this here so we pre-allocate this once and can re-use
1220          *          on every receive.
1221          */
1222         __u8 *digest;
1223
1224         /* sendbuf acct. policy.        */
1225         __u32 sndbuf_policy;
1226
1227         /* rcvbuf acct. policy. */
1228         __u32 rcvbuf_policy;
1229
1230         /* SCTP AUTH: array of the HMACs that will be allocated
1231          * we need this per association so that we don't serialize
1232          */
1233         struct crypto_hash **auth_hmacs;
1234
1235         /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */
1236          struct sctp_hmac_algo_param *auth_hmacs_list;
1237
1238         /* SCTP-AUTH: chunks to authenticate encoded into parameter */
1239         struct sctp_chunks_param *auth_chunk_list;
1240
1241         /* SCTP-AUTH: endpoint shared keys */
1242         struct list_head endpoint_shared_keys;
1243         __u16 active_key_id;
1244 };
1245
1246 /* Recover the outter endpoint structure. */
1247 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base)
1248 {
1249         struct sctp_endpoint *ep;
1250
1251         ep = container_of(base, struct sctp_endpoint, base);
1252         return ep;
1253 }
1254
1255 /* These are function signatures for manipulating endpoints.  */
1256 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t);
1257 void sctp_endpoint_free(struct sctp_endpoint *);
1258 void sctp_endpoint_put(struct sctp_endpoint *);
1259 void sctp_endpoint_hold(struct sctp_endpoint *);
1260 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *);
1261 struct sctp_association *sctp_endpoint_lookup_assoc(
1262         const struct sctp_endpoint *ep,
1263         const union sctp_addr *paddr,
1264         struct sctp_transport **);
1265 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *,
1266                                 const union sctp_addr *);
1267 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *,
1268                                         struct net *, const union sctp_addr *);
1269 int sctp_has_association(struct net *net, const union sctp_addr *laddr,
1270                          const union sctp_addr *paddr);
1271
1272 int sctp_verify_init(struct net *net, const struct sctp_association *asoc,
1273                      sctp_cid_t, sctp_init_chunk_t *peer_init,
1274                      struct sctp_chunk *chunk, struct sctp_chunk **err_chunk);
1275 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk,
1276                       const union sctp_addr *peer,
1277                       sctp_init_chunk_t *init, gfp_t gfp);
1278 __u32 sctp_generate_tag(const struct sctp_endpoint *);
1279 __u32 sctp_generate_tsn(const struct sctp_endpoint *);
1280
1281 struct sctp_inithdr_host {
1282         __u32 init_tag;
1283         __u32 a_rwnd;
1284         __u16 num_outbound_streams;
1285         __u16 num_inbound_streams;
1286         __u32 initial_tsn;
1287 };
1288
1289 /* SCTP_GET_ASSOC_STATS counters */
1290 struct sctp_priv_assoc_stats {
1291         /* Maximum observed rto in the association during subsequent
1292          * observations. Value is set to 0 if no RTO measurement took place
1293          * The transport where the max_rto was observed is returned in
1294          * obs_rto_ipaddr
1295          */
1296         struct sockaddr_storage obs_rto_ipaddr;
1297         __u64 max_obs_rto;
1298         /* Total In and Out SACKs received and sent */
1299         __u64 isacks;
1300         __u64 osacks;
1301         /* Total In and Out packets received and sent */
1302         __u64 opackets;
1303         __u64 ipackets;
1304         /* Total retransmitted chunks */
1305         __u64 rtxchunks;
1306         /* TSN received > next expected */
1307         __u64 outofseqtsns;
1308         /* Duplicate Chunks received */
1309         __u64 idupchunks;
1310         /* Gap Ack Blocks received */
1311         __u64 gapcnt;
1312         /* Unordered data chunks sent and received */
1313         __u64 ouodchunks;
1314         __u64 iuodchunks;
1315         /* Ordered data chunks sent and received */
1316         __u64 oodchunks;
1317         __u64 iodchunks;
1318         /* Control chunks sent and received */
1319         __u64 octrlchunks;
1320         __u64 ictrlchunks;
1321 };
1322
1323 /* RFC2960
1324  *
1325  * 12. Recommended Transmission Control Block (TCB) Parameters
1326  *
1327  * This section details a recommended set of parameters that should
1328  * be contained within the TCB for an implementation. This section is
1329  * for illustrative purposes and should not be deemed as requirements
1330  * on an implementation or as an exhaustive list of all parameters
1331  * inside an SCTP TCB. Each implementation may need its own additional
1332  * parameters for optimization.
1333  */
1334
1335
1336 /* Here we have information about each individual association. */
1337 struct sctp_association {
1338
1339         /* A base structure common to endpoint and association.
1340          * In this context, it represents the associations's view
1341          * of the local endpoint of the association.
1342          */
1343         struct sctp_ep_common base;
1344
1345         /* Associations on the same socket. */
1346         struct list_head asocs;
1347
1348         /* association id. */
1349         sctp_assoc_t assoc_id;
1350
1351         /* This is our parent endpoint.  */
1352         struct sctp_endpoint *ep;
1353
1354         /* These are those association elements needed in the cookie.  */
1355         struct sctp_cookie c;
1356
1357         /* This is all information about our peer.  */
1358         struct {
1359                 /* transport_addr_list
1360                  *
1361                  * Peer        : A list of SCTP transport addresses that the
1362                  * Transport   : peer is bound to. This information is derived
1363                  * Address     : from the INIT or INIT ACK and is used to
1364                  * List        : associate an inbound packet with a given
1365                  *             : association. Normally this information is
1366                  *             : hashed or keyed for quick lookup and access
1367                  *             : of the TCB.
1368                  *             : The list is also initialized with the list
1369                  *             : of addresses passed with the sctp_connectx()
1370                  *             : call.
1371                  *
1372                  * It is a list of SCTP_transport's.
1373                  */
1374                 struct list_head transport_addr_list;
1375
1376                 /* rwnd
1377                  *
1378                  * Peer Rwnd   : Current calculated value of the peer's rwnd.
1379                  */
1380                 __u32 rwnd;
1381
1382                 /* transport_count
1383                  *
1384                  * Peer        : A count of the number of peer addresses
1385                  * Transport   : in the Peer Transport Address List.
1386                  * Address     :
1387                  * Count       :
1388                  */
1389                 __u16 transport_count;
1390
1391                 /* port
1392                  *   The transport layer port number.
1393                  */
1394                 __u16 port;
1395
1396                 /* primary_path
1397                  *
1398                  * Primary     : This is the current primary destination
1399                  * Path        : transport address of the peer endpoint.  It
1400                  *             : may also specify a source transport address
1401                  *             : on this endpoint.
1402                  *
1403                  * All of these paths live on transport_addr_list.
1404                  *
1405                  * At the bakeoffs, we discovered that the intent of
1406                  * primaryPath is that it only changes when the ULP
1407                  * asks to have it changed.  We add the activePath to
1408                  * designate the connection we are currently using to
1409                  * transmit new data and most control chunks.
1410                  */
1411                 struct sctp_transport *primary_path;
1412
1413                 /* Cache the primary path address here, when we
1414                  * need a an address for msg_name.
1415                  */
1416                 union sctp_addr primary_addr;
1417
1418                 /* active_path
1419                  *   The path that we are currently using to
1420                  *   transmit new data and most control chunks.
1421                  */
1422                 struct sctp_transport *active_path;
1423
1424                 /* retran_path
1425                  *
1426                  * RFC2960 6.4 Multi-homed SCTP Endpoints
1427                  * ...
1428                  * Furthermore, when its peer is multi-homed, an
1429                  * endpoint SHOULD try to retransmit a chunk to an
1430                  * active destination transport address that is
1431                  * different from the last destination address to
1432                  * which the DATA chunk was sent.
1433                  */
1434                 struct sctp_transport *retran_path;
1435
1436                 /* Pointer to last transport I have sent on.  */
1437                 struct sctp_transport *last_sent_to;
1438
1439                 /* This is the last transport I have received DATA on.  */
1440                 struct sctp_transport *last_data_from;
1441
1442                 /*
1443                  * Mapping  An array of bits or bytes indicating which out of
1444                  * Array    order TSN's have been received (relative to the
1445                  *          Last Rcvd TSN). If no gaps exist, i.e. no out of
1446                  *          order packets have been received, this array
1447                  *          will be set to all zero. This structure may be
1448                  *          in the form of a circular buffer or bit array.
1449                  *
1450                  * Last Rcvd   : This is the last TSN received in
1451                  * TSN         : sequence. This value is set initially by
1452                  *             : taking the peer's Initial TSN, received in
1453                  *             : the INIT or INIT ACK chunk, and subtracting
1454                  *             : one from it.
1455                  *
1456                  * Throughout most of the specification this is called the
1457                  * "Cumulative TSN ACK Point".  In this case, we
1458                  * ignore the advice in 12.2 in favour of the term
1459                  * used in the bulk of the text.  This value is hidden
1460                  * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn().
1461                  */
1462                 struct sctp_tsnmap tsn_map;
1463
1464                 /* This mask is used to disable sending the ASCONF chunk
1465                  * with specified parameter to peer.
1466                  */
1467                 __be16 addip_disabled_mask;
1468
1469                 /* These are capabilities which our peer advertised.  */
1470                 __u8    ecn_capable:1,      /* Can peer do ECN? */
1471                         ipv4_address:1,     /* Peer understands IPv4 addresses? */
1472                         ipv6_address:1,     /* Peer understands IPv6 addresses? */
1473                         hostname_address:1, /* Peer understands DNS addresses? */
1474                         asconf_capable:1,   /* Does peer support ADDIP? */
1475                         prsctp_capable:1,   /* Can peer do PR-SCTP? */
1476                         auth_capable:1;     /* Is peer doing SCTP-AUTH? */
1477
1478                 /* Ack State   : This flag indicates if the next received
1479                  *             : packet is to be responded to with a
1480                  *             : SACK. This is initializedto 0.  When a packet
1481                  *             : is received it is incremented. If this value
1482                  *             : reaches 2 or more, a SACK is sent and the
1483                  *             : value is reset to 0. Note: This is used only
1484                  *             : when no DATA chunks are received out of
1485                  *             : order.  When DATA chunks are out of order,
1486                  *             : SACK's are not delayed (see Section 6).
1487                  */
1488                 __u8    sack_needed;     /* Do we need to sack the peer? */
1489                 __u32   sack_cnt;
1490                 __u32   sack_generation;
1491
1492                 __u32   adaptation_ind;  /* Adaptation Code point. */
1493
1494                 struct sctp_inithdr_host i;
1495                 void *cookie;
1496                 int cookie_len;
1497
1498                 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk.
1499                  * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the
1500                  * Initial TSN Value minus 1
1501                  */
1502                 __u32 addip_serial;
1503
1504                 /* SCTP-AUTH: We need to know pears random number, hmac list
1505                  * and authenticated chunk list.  All that is part of the
1506                  * cookie and these are just pointers to those locations
1507                  */
1508                 sctp_random_param_t *peer_random;
1509                 sctp_chunks_param_t *peer_chunks;
1510                 sctp_hmac_algo_param_t *peer_hmacs;
1511         } peer;
1512
1513         /* State       : A state variable indicating what state the
1514          *             : association is in, i.e. COOKIE-WAIT,
1515          *             : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING,
1516          *             : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT.
1517          *
1518          *              Note: No "CLOSED" state is illustrated since if a
1519          *              association is "CLOSED" its TCB SHOULD be removed.
1520          *
1521          *              In this implementation we DO have a CLOSED
1522          *              state which is used during initiation and shutdown.
1523          *
1524          *              State takes values from SCTP_STATE_*.
1525          */
1526         sctp_state_t state;
1527
1528         /* Overall     : The overall association error count.
1529          * Error Count : [Clear this any time I get something.]
1530          */
1531         int overall_error_count;
1532
1533         /* The cookie life I award for any cookie.  */
1534         ktime_t cookie_life;
1535
1536         /* These are the association's initial, max, and min RTO values.
1537          * These values will be initialized by system defaults, but can
1538          * be modified via the SCTP_RTOINFO socket option.
1539          */
1540         unsigned long rto_initial;
1541         unsigned long rto_max;
1542         unsigned long rto_min;
1543
1544         /* Maximum number of new data packets that can be sent in a burst.  */
1545         int max_burst;
1546
1547         /* This is the max_retrans value for the association.  This value will
1548          * be initialized initialized from system defaults, but can be
1549          * modified by the SCTP_ASSOCINFO socket option.
1550          */
1551         int max_retrans;
1552
1553         /* This is the partially failed retrans value for the transport
1554          * and will be initialized from the assocs value.  This can be
1555          * changed using the SCTP_PEER_ADDR_THLDS socket option
1556          */
1557         int pf_retrans;
1558
1559         /* Maximum number of times the endpoint will retransmit INIT  */
1560         __u16 max_init_attempts;
1561
1562         /* How many times have we resent an INIT? */
1563         __u16 init_retries;
1564
1565         /* The largest timeout or RTO value to use in attempting an INIT */
1566         unsigned long max_init_timeo;
1567
1568         /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
1569          * the destination address every heartbeat interval. This value
1570          * will be inherited by all new transports.
1571          */
1572         unsigned long hbinterval;
1573
1574         /* This is the max_retrans value for new transports in the
1575          * association.
1576          */
1577         __u16 pathmaxrxt;
1578
1579         /* Flag that path mtu update is pending */
1580         __u8   pmtu_pending;
1581
1582         /* Association : The smallest PMTU discovered for all of the
1583          * PMTU        : peer's transport addresses.
1584          */
1585         __u32 pathmtu;
1586
1587         /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
1588         __u32 param_flags;
1589
1590         __u32 sackfreq;
1591         /* SACK delay timeout */
1592         unsigned long sackdelay;
1593
1594         unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES];
1595         struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES];
1596
1597         /* Transport to which SHUTDOWN chunk was last sent.  */
1598         struct sctp_transport *shutdown_last_sent_to;
1599
1600         /* Transport to which INIT chunk was last sent.  */
1601         struct sctp_transport *init_last_sent_to;
1602
1603         /* How many times have we resent a SHUTDOWN */
1604         int shutdown_retries;
1605
1606         /* Next TSN    : The next TSN number to be assigned to a new
1607          *             : DATA chunk.  This is sent in the INIT or INIT
1608          *             : ACK chunk to the peer and incremented each
1609          *             : time a DATA chunk is assigned a TSN
1610          *             : (normally just prior to transmit or during
1611          *             : fragmentation).
1612          */
1613         __u32 next_tsn;
1614
1615         /*
1616          * Last Rcvd   : This is the last TSN received in sequence.  This value
1617          * TSN         : is set initially by taking the peer's Initial TSN,
1618          *             : received in the INIT or INIT ACK chunk, and
1619          *             : subtracting one from it.
1620          *
1621          * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point.
1622          */
1623
1624         __u32 ctsn_ack_point;
1625
1626         /* PR-SCTP Advanced.Peer.Ack.Point */
1627         __u32 adv_peer_ack_point;
1628
1629         /* Highest TSN that is acknowledged by incoming SACKs. */
1630         __u32 highest_sacked;
1631
1632         /* TSN marking the fast recovery exit point */
1633         __u32 fast_recovery_exit;
1634
1635         /* Flag to track the current fast recovery state */
1636         __u8 fast_recovery;
1637
1638         /* The number of unacknowledged data chunks.  Reported through
1639          * the SCTP_STATUS sockopt.
1640          */
1641         __u16 unack_data;
1642
1643         /* The total number of data chunks that we've had to retransmit
1644          * as the result of a T3 timer expiration
1645          */
1646         __u32 rtx_data_chunks;
1647
1648         /* This is the association's receive buffer space.  This value is used
1649          * to set a_rwnd field in an INIT or a SACK chunk.
1650          */
1651         __u32 rwnd;
1652
1653         /* This is the last advertised value of rwnd over a SACK chunk. */
1654         __u32 a_rwnd;
1655
1656         /* This is the sndbuf size in use for the association.
1657          * This corresponds to the sndbuf size for the association,
1658          * as specified in the sk->sndbuf.
1659          */
1660         int sndbuf_used;
1661
1662         /* This is the amount of memory that this association has allocated
1663          * in the receive path at any given time.
1664          */
1665         atomic_t rmem_alloc;
1666
1667         /* This is the wait queue head for send requests waiting on
1668          * the association sndbuf space.
1669          */
1670         wait_queue_head_t       wait;
1671
1672         /* The message size at which SCTP fragmentation will occur. */
1673         __u32 frag_point;
1674         __u32 user_frag;
1675
1676         /* Counter used to count INIT errors. */
1677         int init_err_counter;
1678
1679         /* Count the number of INIT cycles (for doubling timeout). */
1680         int init_cycle;
1681
1682         /* Default send parameters. */
1683         __u16 default_stream;
1684         __u16 default_flags;
1685         __u32 default_ppid;
1686         __u32 default_context;
1687         __u32 default_timetolive;
1688
1689         /* Default receive parameters */
1690         __u32 default_rcv_context;
1691
1692         /* This tracks outbound ssn for a given stream.  */
1693         struct sctp_ssnmap *ssnmap;
1694
1695         /* All outbound chunks go through this structure.  */
1696         struct sctp_outq outqueue;
1697
1698         /* A smart pipe that will handle reordering and fragmentation,
1699          * as well as handle passing events up to the ULP.
1700          */
1701         struct sctp_ulpq ulpq;
1702
1703         /* Last TSN that caused an ECNE Chunk to be sent.  */
1704         __u32 last_ecne_tsn;
1705
1706         /* Last TSN that caused a CWR Chunk to be sent.  */
1707         __u32 last_cwr_tsn;
1708
1709         /* How many duplicated TSNs have we seen?  */
1710         int numduptsns;
1711
1712         /* These are to support
1713          * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses
1714          *  and Enforcement of Flow and Message Limits"
1715          * <draft-ietf-tsvwg-addip-sctp-02.txt>
1716          * or "ADDIP" for short.
1717          */
1718
1719
1720
1721         /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
1722          *
1723          * R1) One and only one ASCONF Chunk MAY be in transit and
1724          * unacknowledged at any one time.  If a sender, after sending
1725          * an ASCONF chunk, decides it needs to transfer another
1726          * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
1727          * returns from the previous ASCONF Chunk before sending a
1728          * subsequent ASCONF. Note this restriction binds each side,
1729          * so at any time two ASCONF may be in-transit on any given
1730          * association (one sent from each endpoint).
1731          *
1732          * [This is our one-and-only-one ASCONF in flight.  If we do
1733          * not have an ASCONF in flight, this is NULL.]
1734          */
1735         struct sctp_chunk *addip_last_asconf;
1736
1737         /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk.
1738          *
1739          * This is needed to implement itmes E1 - E4 of the updated
1740          * spec.  Here is the justification:
1741          *
1742          * Since the peer may bundle multiple ASCONF chunks toward us,
1743          * we now need the ability to cache multiple ACKs.  The section
1744          * describes in detail how they are cached and cleaned up.
1745          */
1746         struct list_head asconf_ack_list;
1747
1748         /* These ASCONF chunks are waiting to be sent.
1749          *
1750          * These chunaks can't be pushed to outqueue until receiving
1751          * ASCONF_ACK for the previous ASCONF indicated by
1752          * addip_last_asconf, so as to guarantee that only one ASCONF
1753          * is in flight at any time.
1754          *
1755          * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
1756          *
1757          * In defining the ASCONF Chunk transfer procedures, it is
1758          * essential that these transfers MUST NOT cause congestion
1759          * within the network.  To achieve this, we place these
1760          * restrictions on the transfer of ASCONF Chunks:
1761          *
1762          * R1) One and only one ASCONF Chunk MAY be in transit and
1763          * unacknowledged at any one time.  If a sender, after sending
1764          * an ASCONF chunk, decides it needs to transfer another
1765          * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
1766          * returns from the previous ASCONF Chunk before sending a
1767          * subsequent ASCONF. Note this restriction binds each side,
1768          * so at any time two ASCONF may be in-transit on any given
1769          * association (one sent from each endpoint).
1770          *
1771          *
1772          * [I really think this is EXACTLY the sort of intelligence
1773          *  which already resides in sctp_outq.  Please move this
1774          *  queue and its supporting logic down there.  --piggy]
1775          */
1776         struct list_head addip_chunk_list;
1777
1778         /* ADDIP Section 4.1 ASCONF Chunk Procedures
1779          *
1780          * A2) A serial number should be assigned to the Chunk. The
1781          * serial number SHOULD be a monotonically increasing
1782          * number. The serial number SHOULD be initialized at
1783          * the start of the association to the same value as the
1784          * Initial TSN and every time a new ASCONF chunk is created
1785          * it is incremented by one after assigning the serial number
1786          * to the newly created chunk.
1787          *
1788          * ADDIP
1789          * 3.1.1  Address/Stream Configuration Change Chunk (ASCONF)
1790          *
1791          * Serial Number : 32 bits (unsigned integer)
1792          *
1793          * This value represents a Serial Number for the ASCONF
1794          * Chunk. The valid range of Serial Number is from 0 to
1795          * 4294967295 (2^32 - 1).  Serial Numbers wrap back to 0
1796          * after reaching 4294967295.
1797          */
1798         __u32 addip_serial;
1799         int src_out_of_asoc_ok;
1800         union sctp_addr *asconf_addr_del_pending;
1801         struct sctp_transport *new_transport;
1802
1803         /* SCTP AUTH: list of the endpoint shared keys.  These
1804          * keys are provided out of band by the user applicaton
1805          * and can't change during the lifetime of the association
1806          */
1807         struct list_head endpoint_shared_keys;
1808
1809         /* SCTP AUTH:
1810          * The current generated assocaition shared key (secret)
1811          */
1812         struct sctp_auth_bytes *asoc_shared_key;
1813
1814         /* SCTP AUTH: hmac id of the first peer requested algorithm
1815          * that we support.
1816          */
1817         __u16 default_hmac_id;
1818
1819         __u16 active_key_id;
1820
1821         __u8 need_ecne:1,       /* Need to send an ECNE Chunk? */
1822              temp:1;            /* Is it a temporary association? */
1823
1824         struct sctp_priv_assoc_stats stats;
1825 };
1826
1827
1828 /* An eyecatcher for determining if we are really looking at an
1829  * association data structure.
1830  */
1831 enum {
1832         SCTP_ASSOC_EYECATCHER = 0xa550c123,
1833 };
1834
1835 /* Recover the outter association structure. */
1836 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base)
1837 {
1838         struct sctp_association *asoc;
1839
1840         asoc = container_of(base, struct sctp_association, base);
1841         return asoc;
1842 }
1843
1844 /* These are function signatures for manipulating associations.  */
1845
1846
1847 struct sctp_association *
1848 sctp_association_new(const struct sctp_endpoint *, const struct sock *,
1849                      sctp_scope_t scope, gfp_t gfp);
1850 void sctp_association_free(struct sctp_association *);
1851 void sctp_association_put(struct sctp_association *);
1852 void sctp_association_hold(struct sctp_association *);
1853
1854 struct sctp_transport *sctp_assoc_choose_alter_transport(
1855         struct sctp_association *, struct sctp_transport *);
1856 void sctp_assoc_update_retran_path(struct sctp_association *);
1857 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *,
1858                                           const union sctp_addr *);
1859 int sctp_assoc_lookup_laddr(struct sctp_association *asoc,
1860                             const union sctp_addr *laddr);
1861 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *,
1862                                      const union sctp_addr *address,
1863                                      const gfp_t gfp,
1864                                      const int peer_state);
1865 void sctp_assoc_del_peer(struct sctp_association *asoc,
1866                          const union sctp_addr *addr);
1867 void sctp_assoc_rm_peer(struct sctp_association *asoc,
1868                          struct sctp_transport *peer);
1869 void sctp_assoc_control_transport(struct sctp_association *,
1870                                   struct sctp_transport *,
1871                                   sctp_transport_cmd_t, sctp_sn_error_t);
1872 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32);
1873 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *,
1874                                            struct net *,
1875                                            const union sctp_addr *,
1876                                            const union sctp_addr *);
1877 void sctp_assoc_migrate(struct sctp_association *, struct sock *);
1878 void sctp_assoc_update(struct sctp_association *old,
1879                        struct sctp_association *new);
1880
1881 __u32 sctp_association_get_next_tsn(struct sctp_association *);
1882
1883 void sctp_assoc_sync_pmtu(struct sock *, struct sctp_association *);
1884 void sctp_assoc_rwnd_update(struct sctp_association *, bool);
1885 void sctp_assoc_set_primary(struct sctp_association *,
1886                             struct sctp_transport *);
1887 void sctp_assoc_del_nonprimary_peers(struct sctp_association *,
1888                                     struct sctp_transport *);
1889 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *,
1890                                      sctp_scope_t, gfp_t);
1891 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *,
1892                                          struct sctp_cookie*,
1893                                          gfp_t gfp);
1894 int sctp_assoc_set_id(struct sctp_association *, gfp_t);
1895 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc);
1896 struct sctp_chunk *sctp_assoc_lookup_asconf_ack(
1897                                         const struct sctp_association *asoc,
1898                                         __be32 serial);
1899 void sctp_asconf_queue_teardown(struct sctp_association *asoc);
1900
1901 int sctp_cmp_addr_exact(const union sctp_addr *ss1,
1902                         const union sctp_addr *ss2);
1903 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc);
1904
1905 /* A convenience structure to parse out SCTP specific CMSGs. */
1906 typedef struct sctp_cmsgs {
1907         struct sctp_initmsg *init;
1908         struct sctp_sndrcvinfo *info;
1909 } sctp_cmsgs_t;
1910
1911 /* Structure for tracking memory objects */
1912 typedef struct {
1913         char *label;
1914         atomic_t *counter;
1915 } sctp_dbg_objcnt_entry_t;
1916
1917 #endif /* __sctp_structs_h__ */