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 /* SPDX-License-Identifier: GPL-2.0-or-later */
 /* SCTP kernel implementation
  * (C) Copyright IBM Corp. 2001, 2004
  * Copyright (c) 1999-2000 Cisco, Inc.
  * Copyright (c) 1999-2001 Motorola, Inc.
  * Copyright (c) 2001 Intel Corp.
  *
  * This file is part of the SCTP kernel implementation
  *
  * Please send any bug reports or fixes you make to the
  * email addresses:
  *    lksctp developers <linux-sctp@vger.kernel.org>
  *
  * Written or modified by:
  *    Randall Stewart       <randall@sctp.chicago.il.us>
  *    Ken Morneau       <kmorneau@cisco.com>
  *    Qiaobing Xie      <qxie1@email.mot.com>
  *    La Monte H.P. Yarroll <piggy@acm.org>
  *    Karl Knutson      <karl@athena.chicago.il.us>
  *    Jon Grimm         <jgrimm@us.ibm.com>
  *    Xingang Guo       <xingang.guo@intel.com>
  *    Hui Huang         <hui.huang@nokia.com>
  *    Sridhar Samudrala     <sri@us.ibm.com>
  *    Daisy Chang       <daisyc@us.ibm.com>
  *    Dajiang Zhang     <dajiang.zhang@nokia.com>
  *    Ardelle Fan       <ardelle.fan@intel.com>
  *    Ryan Layer        <rmlayer@us.ibm.com>
  *    Anup Pemmaiah     <pemmaiah@cc.usu.edu>
  *    Kevin Gao             <kevin.gao@intel.com>
  */
 
 #ifndef __sctp_structs_h__
 #define __sctp_structs_h__
 
 #include <linux/ktime.h>
 #include <linux/generic-radix-tree.h>
 #include <linux/rhashtable-types.h>
 #include <linux/socket.h>   /* linux/in.h needs this!!    */
 #include <linux/in.h>       /* We get struct sockaddr_in. */
 #include <linux/in6.h>      /* We get struct in6_addr     */
 #include <linux/ipv6.h>
 #include <asm/param.h>      /* We get MAXHOSTNAMELEN.     */
 #include <linux/atomic.h>       /* This gets us atomic counters.  */
 #include <linux/skbuff.h>   /* We need sk_buff_head. */
 #include <linux/workqueue.h>    /* We need tq_struct.    */
 #include <linux/sctp.h>     /* We need sctp* header structs.  */
 #include <net/sctp/auth.h>  /* We need auth specific structs */
 #include <net/ip.h>     /* For inet_skb_parm */
 
 /* A convenience structure for handling sockaddr structures.
  * We should wean ourselves off this.
  */
 union sctp_addr {
     struct sockaddr_in v4;
     struct sockaddr_in6 v6;
     struct sockaddr sa;
 };
 
 /* Forward declarations for data structures. */
 struct sctp_globals;
 struct sctp_endpoint;
 struct sctp_association;
 struct sctp_transport;
 struct sctp_packet;
 struct sctp_chunk;
 struct sctp_inq;
 struct sctp_outq;
 struct sctp_bind_addr;
 struct sctp_ulpq;
 struct sctp_ep_common;
 struct crypto_shash;
 struct sctp_stream;
 
 
 #include <net/sctp/tsnmap.h>
 #include <net/sctp/ulpevent.h>
 #include <net/sctp/ulpqueue.h>
 #include <net/sctp/stream_interleave.h>
 
 /* Structures useful for managing bind/connect. */
 
 struct sctp_bind_bucket {
     unsigned short  port;
     signed char fastreuse;
     signed char fastreuseport;
     kuid_t      fastuid;
     struct hlist_node   node;
     struct hlist_head   owner;
     struct net  *net;
 };
 
 struct sctp_bind_hashbucket {
     spinlock_t  lock;
     struct hlist_head   chain;
 };
 
 /* Used for hashing all associations.  */
 struct sctp_hashbucket {
     rwlock_t    lock;
     struct hlist_head   chain;
 } __attribute__((__aligned__(8)));
 
 
 /* The SCTP globals structure. */
 extern struct sctp_globals {
     /* This is a list of groups of functions for each address
      * family that we support.
      */
     struct list_head address_families;
 
     /* This is the hash of all endpoints. */
     struct sctp_hashbucket *ep_hashtable;
     /* This is the sctp port control hash.  */
     struct sctp_bind_hashbucket *port_hashtable;
     /* This is the hash of all transports. */
     struct rhltable transport_hashtable;
 
     /* Sizes of above hashtables. */
     int ep_hashsize;
     int port_hashsize;
 
     /* Default initialization values to be applied to new associations. */
     __u16 max_instreams;
     __u16 max_outstreams;
 
     /* Flag to indicate whether computing and verifying checksum
      * is disabled. */
         bool checksum_disable;
 } sctp_globals;
 
 #define sctp_max_instreams      (sctp_globals.max_instreams)
 #define sctp_max_outstreams     (sctp_globals.max_outstreams)
 #define sctp_address_families       (sctp_globals.address_families)
 #define sctp_ep_hashsize        (sctp_globals.ep_hashsize)
 #define sctp_ep_hashtable       (sctp_globals.ep_hashtable)
 #define sctp_port_hashsize      (sctp_globals.port_hashsize)
 #define sctp_port_hashtable     (sctp_globals.port_hashtable)
 #define sctp_transport_hashtable    (sctp_globals.transport_hashtable)
 #define sctp_checksum_disable       (sctp_globals.checksum_disable)
 
 /* SCTP Socket type: UDP or TCP style. */
 enum sctp_socket_type {
     SCTP_SOCKET_UDP = 0,
     SCTP_SOCKET_UDP_HIGH_BANDWIDTH,
     SCTP_SOCKET_TCP
 };
 
 /* Per socket SCTP information. */
 struct sctp_sock {
     /* inet_sock has to be the first member of sctp_sock */
     struct inet_sock inet;
     /* What kind of a socket is this? */
     enum sctp_socket_type type;
 
     /* PF_ family specific functions.  */
     struct sctp_pf *pf;
 
     /* Access to HMAC transform. */
     struct crypto_shash *hmac;
     char *sctp_hmac_alg;
 
     /* What is our base endpointer? */
     struct sctp_endpoint *ep;
 
     struct sctp_bind_bucket *bind_hash;
     /* Various Socket Options.  */
     __u16 default_stream;
     __u32 default_ppid;
     __u16 default_flags;
     __u32 default_context;
     __u32 default_timetolive;
     __u32 default_rcv_context;
     int max_burst;
 
     /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
      * the destination address every heartbeat interval. This value
      * will be inherited by all new associations.
      */
     __u32 hbinterval;
     __u32 probe_interval;
 
     __be16 udp_port;
     __be16 encap_port;
 
     /* This is the max_retrans value for new associations. */
     __u16 pathmaxrxt;
 
     __u32 flowlabel;
     __u8  dscp;
 
     __u16 pf_retrans;
     __u16 ps_retrans;
 
     /* The initial Path MTU to use for new associations. */
     __u32 pathmtu;
 
     /* The default SACK delay timeout for new associations. */
     __u32 sackdelay;
     __u32 sackfreq;
 
     /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
     __u32 param_flags;
 
     __u32 default_ss;
 
     struct sctp_rtoinfo rtoinfo;
     struct sctp_paddrparams paddrparam;
     struct sctp_assocparams assocparams;
 
     /*
      * These two structures must be grouped together for the usercopy
      * whitelist region.
      */
     __u16 subscribe;
     struct sctp_initmsg initmsg;
 
     int user_frag;
 
     __u32 autoclose;
     __u32 adaptation_ind;
     __u32 pd_point;
     __u16   nodelay:1,
         pf_expose:2,
         reuse:1,
         disable_fragments:1,
         v4mapped:1,
         frag_interleave:1,
         recvrcvinfo:1,
         recvnxtinfo:1,
         data_ready_signalled:1;
 
     atomic_t pd_mode;
 
     /* Fields after this point will be skipped on copies, like on accept
      * and peeloff operations
      */
 
     /* Receive to here while partial delivery is in effect. */
     struct sk_buff_head pd_lobby;
 
     struct list_head auto_asconf_list;
     int do_auto_asconf;
 };
 
 static inline struct sctp_sock *sctp_sk(const struct sock *sk)
 {
        return (struct sctp_sock *)sk;
 }
 
 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp)
 {
        return (struct sock *)sp;
 }
 
 #if IS_ENABLED(CONFIG_IPV6)
 struct sctp6_sock {
        struct sctp_sock  sctp;
        struct ipv6_pinfo inet6;
 };
 #endif /* CONFIG_IPV6 */
 
 
 /* This is our APPLICATION-SPECIFIC state cookie.
  * THIS IS NOT DICTATED BY THE SPECIFICATION.
  */
 /* These are the parts of an association which we send in the cookie.
  * Most of these are straight out of:
  * RFC2960 12.2 Parameters necessary per association (i.e. the TCB)
  *
  */
 
 struct sctp_cookie {
 
     /* My          : Tag expected in every inbound packet and sent
      * Verification: in the INIT or INIT ACK chunk.
      * Tag         :
      */
     __u32 my_vtag;
 
     /* Peer's      : Tag expected in every outbound packet except
      * Verification: in the INIT chunk.
      * Tag         :
      */
     __u32 peer_vtag;
 
     /* The rest of these are not from the spec, but really need to
      * be in the cookie.
      */
 
     /* My Tie Tag  : Assist in discovering a restarting association. */
     __u32 my_ttag;
 
     /* Peer's Tie Tag: Assist in discovering a restarting association. */
     __u32 peer_ttag;
 
     /* When does this cookie expire? */
     ktime_t expiration;
 
     /* Number of inbound/outbound streams which are set
      * and negotiated during the INIT process.
      */
     __u16 sinit_num_ostreams;
     __u16 sinit_max_instreams;
 
     /* This is the first sequence number I used.  */
     __u32 initial_tsn;
 
     /* This holds the originating address of the INIT packet.  */
     union sctp_addr peer_addr;
 
     /* IG Section 2.35.3 
      * Include the source port of the INIT-ACK
      */
     __u16       my_port;
 
     __u8 prsctp_capable;
 
     /* Padding for future use */
     __u8 padding;       
 
     __u32 adaptation_ind;
 
     __u8 auth_random[sizeof(struct sctp_paramhdr) +
              SCTP_AUTH_RANDOM_LENGTH];
     __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2];
     __u8 auth_chunks[sizeof(struct sctp_paramhdr) + SCTP_AUTH_MAX_CHUNKS];
 
     /* This is a shim for my peer's INIT packet, followed by
      * a copy of the raw address list of the association.
      * The length of the raw address list is saved in the
      * raw_addr_list_len field, which will be used at the time when
      * the association TCB is re-constructed from the cookie.
      */
     __u32 raw_addr_list_len;
     struct sctp_init_chunk peer_init[];
 };
 
 
 /* The format of our cookie that we send to our peer. */
 struct sctp_signed_cookie {
     __u8 signature[SCTP_SECRET_SIZE];
     __u32 __pad;        /* force sctp_cookie alignment to 64 bits */
     struct sctp_cookie c;
 } __packed;
 
 /* This is another convenience type to allocate memory for address
  * params for the maximum size and pass such structures around
  * internally.
  */
 union sctp_addr_param {
     struct sctp_paramhdr p;
     struct sctp_ipv4addr_param v4;
     struct sctp_ipv6addr_param v6;
 };
 
 /* A convenience type to allow walking through the various
  * parameters and avoid casting all over the place.
  */
 union sctp_params {
     void *v;
     struct sctp_paramhdr *p;
     struct sctp_cookie_preserve_param *life;
     struct sctp_hostname_param *dns;
     struct sctp_cookie_param *cookie;
     struct sctp_supported_addrs_param *sat;
     struct sctp_ipv4addr_param *v4;
     struct sctp_ipv6addr_param *v6;
     union sctp_addr_param *addr;
     struct sctp_adaptation_ind_param *aind;
     struct sctp_supported_ext_param *ext;
     struct sctp_random_param *random;
     struct sctp_chunks_param *chunks;
     struct sctp_hmac_algo_param *hmac_algo;
     struct sctp_addip_param *addip;
 };
 
 /* RFC 2960.  Section 3.3.5 Heartbeat.
  *    Heartbeat Information: variable length
  *    The Sender-specific Heartbeat Info field should normally include
  *    information about the sender's current time when this HEARTBEAT
  *    chunk is sent and the destination transport address to which this
  *    HEARTBEAT is sent (see Section 8.3).
  */
 struct sctp_sender_hb_info {
     struct sctp_paramhdr param_hdr;
     union sctp_addr daddr;
     unsigned long sent_at;
     __u64 hb_nonce;
     __u32 probe_size;
 };
 
 int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
              gfp_t gfp);
 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid);
 void sctp_stream_free(struct sctp_stream *stream);
 void sctp_stream_clear(struct sctp_stream *stream);
 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new);
 
 /* What is the current SSN number for this stream? */
 #define sctp_ssn_peek(stream, type, sid) \
     (sctp_stream_##type((stream), (sid))->ssn)
 
 /* Return the next SSN number for this stream.  */
 #define sctp_ssn_next(stream, type, sid) \
     (sctp_stream_##type((stream), (sid))->ssn++)
 
 /* Skip over this ssn and all below. */
 #define sctp_ssn_skip(stream, type, sid, ssn) \
     (sctp_stream_##type((stream), (sid))->ssn = ssn + 1)
 
 /* What is the current MID number for this stream? */
 #define sctp_mid_peek(stream, type, sid) \
     (sctp_stream_##type((stream), (sid))->mid)
 
 /* Return the next MID number for this stream.  */
 #define sctp_mid_next(stream, type, sid) \
     (sctp_stream_##type((stream), (sid))->mid++)
 
 /* Skip over this mid and all below. */
 #define sctp_mid_skip(stream, type, sid, mid) \
     (sctp_stream_##type((stream), (sid))->mid = mid + 1)
 
 /* What is the current MID_uo number for this stream? */
 #define sctp_mid_uo_peek(stream, type, sid) \
     (sctp_stream_##type((stream), (sid))->mid_uo)
 
 /* Return the next MID_uo number for this stream.  */
 #define sctp_mid_uo_next(stream, type, sid) \
     (sctp_stream_##type((stream), (sid))->mid_uo++)
 
 /*
  * Pointers to address related SCTP functions.
  * (i.e. things that depend on the address family.)
  */
 struct sctp_af {
     int     (*sctp_xmit)    (struct sk_buff *skb,
                      struct sctp_transport *);
     int     (*setsockopt)   (struct sock *sk,
                      int level,
                      int optname,
                      sockptr_t optval,
                      unsigned int optlen);
     int     (*getsockopt)   (struct sock *sk,
                      int level,
                      int optname,
                      char __user *optval,
                      int __user *optlen);
     void        (*get_dst)  (struct sctp_transport *t,
                      union sctp_addr *saddr,
                      struct flowi *fl,
                      struct sock *sk);
     void        (*get_saddr)    (struct sctp_sock *sk,
                      struct sctp_transport *t,
                      struct flowi *fl);
     void        (*copy_addrlist) (struct list_head *,
                       struct net_device *);
     int     (*cmp_addr) (const union sctp_addr *addr1,
                      const union sctp_addr *addr2);
     void        (*addr_copy)    (union sctp_addr *dst,
                      union sctp_addr *src);
     void        (*from_skb) (union sctp_addr *,
                      struct sk_buff *skb,
                      int saddr);
     void        (*from_sk)  (union sctp_addr *,
                      struct sock *sk);
     bool        (*from_addr_param) (union sctp_addr *,
                         union sctp_addr_param *,
                         __be16 port, int iif);
     int     (*to_addr_param) (const union sctp_addr *,
                       union sctp_addr_param *); 
     int     (*addr_valid)   (union sctp_addr *,
                      struct sctp_sock *,
                      const struct sk_buff *);
     enum sctp_scope (*scope)(union sctp_addr *);
     void        (*inaddr_any)   (union sctp_addr *, __be16);
     int     (*is_any)   (const union sctp_addr *);
     int     (*available)    (union sctp_addr *,
                      struct sctp_sock *);
     int     (*skb_iif)  (const struct sk_buff *sk);
     int     (*is_ce)    (const struct sk_buff *sk);
     void        (*seq_dump_addr)(struct seq_file *seq,
                      union sctp_addr *addr);
     void        (*ecn_capable)(struct sock *sk);
     __u16       net_header_len;
     int     sockaddr_len;
     int     (*ip_options_len)(struct sock *sk);
     sa_family_t sa_family;
     struct list_head list;
 };
 
 struct sctp_af *sctp_get_af_specific(sa_family_t);
 int sctp_register_af(struct sctp_af *);
 
 /* Protocol family functions. */
 struct sctp_pf {
     void (*event_msgname)(struct sctp_ulpevent *, char *, int *);
     void (*skb_msgname)  (struct sk_buff *, char *, int *);
     int  (*af_supported) (sa_family_t, struct sctp_sock *);
     int  (*cmp_addr) (const union sctp_addr *,
               const union sctp_addr *,
               struct sctp_sock *);
     int  (*bind_verify) (struct sctp_sock *, union sctp_addr *);
     int  (*send_verify) (struct sctp_sock *, union sctp_addr *);
     int  (*supported_addrs)(const struct sctp_sock *, __be16 *);
     struct sock *(*create_accept_sk) (struct sock *sk,
                       struct sctp_association *asoc,
                       bool kern);
     int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr);
     void (*to_sk_saddr)(union sctp_addr *, struct sock *sk);
     void (*to_sk_daddr)(union sctp_addr *, struct sock *sk);
     void (*copy_ip_options)(struct sock *sk, struct sock *newsk);
     struct sctp_af *af;
 };
 
 
 /* Structure to track chunk fragments that have been acked, but peer
  * fragments of the same message have not.
  */
 struct sctp_datamsg {
     /* Chunks waiting to be submitted to lower layer. */
     struct list_head chunks;
     /* Reference counting. */
     refcount_t refcnt;
     /* When is this message no longer interesting to the peer? */
     unsigned long expires_at;
     /* Did the messenge fail to send? */
     int send_error;
     u8 send_failed:1,
        can_delay:1, /* should this message be Nagle delayed */
        abandoned:1; /* should this message be abandoned */
 };
 
 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *,
                         struct sctp_sndrcvinfo *,
                         struct iov_iter *);
 void sctp_datamsg_free(struct sctp_datamsg *);
 void sctp_datamsg_put(struct sctp_datamsg *);
 void sctp_chunk_fail(struct sctp_chunk *, int error);
 int sctp_chunk_abandoned(struct sctp_chunk *);
 
 /* RFC2960 1.4 Key Terms
  *
  * o Chunk: A unit of information within an SCTP packet, consisting of
  * a chunk header and chunk-specific content.
  *
  * As a matter of convenience, we remember the SCTP common header for
  * each chunk as well as a few other header pointers...
  */
 struct sctp_chunk {
     struct list_head list;
 
     refcount_t refcnt;
 
     /* How many times this chunk have been sent, for prsctp RTX policy */
     int sent_count;
 
     union {
         /* This is our link to the per-transport transmitted list.  */
         struct list_head transmitted_list;
         /* List in specific stream outq */
         struct list_head stream_list;
     };
 
     /* This field is used by chunks that hold fragmented data.
      * For the first fragment this is the list that holds the rest of
      * fragments. For the remaining fragments, this is the link to the
      * frag_list maintained in the first fragment.
      */
     struct list_head frag_list;
 
     /* This points to the sk_buff containing the actual data.  */
     struct sk_buff *skb;
 
     union {
         /* In case of GSO packets, this will store the head one */
         struct sk_buff *head_skb;
         /* In case of auth enabled, this will point to the shkey */
         struct sctp_shared_key *shkey;
     };
 
     /* These are the SCTP headers by reverse order in a packet.
      * Note that some of these may happen more than once.  In that
      * case, we point at the "current" one, whatever that means
      * for that level of header.
      */
 
     /* We point this at the FIRST TLV parameter to chunk_hdr.  */
     union sctp_params param_hdr;
     union {
         __u8 *v;
         struct sctp_datahdr *data_hdr;
         struct sctp_inithdr *init_hdr;
         struct sctp_sackhdr *sack_hdr;
         struct sctp_heartbeathdr *hb_hdr;
         struct sctp_sender_hb_info *hbs_hdr;
         struct sctp_shutdownhdr *shutdown_hdr;
         struct sctp_signed_cookie *cookie_hdr;
         struct sctp_ecnehdr *ecne_hdr;
         struct sctp_cwrhdr *ecn_cwr_hdr;
         struct sctp_errhdr *err_hdr;
         struct sctp_addiphdr *addip_hdr;
         struct sctp_fwdtsn_hdr *fwdtsn_hdr;
         struct sctp_authhdr *auth_hdr;
         struct sctp_idatahdr *idata_hdr;
         struct sctp_ifwdtsn_hdr *ifwdtsn_hdr;
     } subh;
 
     __u8 *chunk_end;
 
     struct sctp_chunkhdr *chunk_hdr;
     struct sctphdr *sctp_hdr;
 
     /* This needs to be recoverable for SCTP_SEND_FAILED events. */
     struct sctp_sndrcvinfo sinfo;
 
     /* Which association does this belong to?  */
     struct sctp_association *asoc;
 
     /* What endpoint received this chunk? */
     struct sctp_ep_common *rcvr;
 
     /* We fill this in if we are calculating RTT. */
     unsigned long sent_at;
 
     /* What is the origin IP address for this chunk?  */
     union sctp_addr source;
     /* Destination address for this chunk. */
     union sctp_addr dest;
 
     /* For outbound message, track all fragments for SEND_FAILED. */
     struct sctp_datamsg *msg;
 
     /* For an inbound chunk, this tells us where it came from.
      * For an outbound chunk, it tells us where we'd like it to
      * go.  It is NULL if we have no preference.
      */
     struct sctp_transport *transport;
 
     /* SCTP-AUTH:  For the special case inbound processing of COOKIE-ECHO
      * we need save a pointer to the AUTH chunk, since the SCTP-AUTH
      * spec violates the principle premis that all chunks are processed
      * in order.
      */
     struct sk_buff *auth_chunk;
 
 #define SCTP_CAN_FRTX 0x0
 #define SCTP_NEED_FRTX 0x1
 #define SCTP_DONT_FRTX 0x2
     __u16   rtt_in_progress:1,  /* This chunk used for RTT calc? */
         has_tsn:1,      /* Does this chunk have a TSN yet? */
         has_ssn:1,      /* Does this chunk have a SSN yet? */
 #define has_mid has_ssn
         singleton:1,        /* Only chunk in the packet? */
         end_of_packet:1,    /* Last chunk in the packet? */
         ecn_ce_done:1,      /* Have we processed the ECN CE bit? */
         pdiscard:1,     /* Discard the whole packet now? */
         tsn_gap_acked:1,    /* Is this chunk acked by a GAP ACK? */
         data_accepted:1,    /* At least 1 chunk accepted */
         auth:1,         /* IN: was auth'ed | OUT: needs auth */
         has_asconf:1,       /* IN: have seen an asconf before */
         pmtu_probe:1,       /* Used by PLPMTUD, can be set in s HB chunk */
         tsn_missing_report:2,   /* Data chunk missing counter. */
         fast_retransmit:2;  /* Is this chunk fast retransmitted? */
 };
 
 #define sctp_chunk_retransmitted(chunk) (chunk->sent_count > 1)
 void sctp_chunk_hold(struct sctp_chunk *);
 void sctp_chunk_put(struct sctp_chunk *);
 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
               struct iov_iter *from);
 void sctp_chunk_free(struct sctp_chunk *);
 void  *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data);
 struct sctp_chunk *sctp_chunkify(struct sk_buff *,
                  const struct sctp_association *,
                  struct sock *, gfp_t gfp);
 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *,
              union sctp_addr *);
 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk);
 
 static inline __u16 sctp_chunk_stream_no(struct sctp_chunk *ch)
 {
     return ntohs(ch->subh.data_hdr->stream);
 }
 
 enum {
     SCTP_ADDR_NEW,      /* new address added to assoc/ep */
     SCTP_ADDR_SRC,      /* address can be used as source */
     SCTP_ADDR_DEL,      /* address about to be deleted */
 };
 
 /* This is a structure for holding either an IPv6 or an IPv4 address.  */
 struct sctp_sockaddr_entry {
     struct list_head list;
     struct rcu_head rcu;
     union sctp_addr a;
     __u8 state;
     __u8 valid;
 };
 
 #define SCTP_ADDRESS_TICK_DELAY 500
 
 /* This structure holds lists of chunks as we are assembling for
  * transmission.
  */
 struct sctp_packet {
     /* These are the SCTP header values (host order) for the packet. */
     __u16 source_port;
     __u16 destination_port;
     __u32 vtag;
 
     /* This contains the payload chunks.  */
     struct list_head chunk_list;
 
     /* This is the overhead of the sctp and ip headers. */
     size_t overhead;
     /* This is the total size of all chunks INCLUDING padding.  */
     size_t size;
     /* This is the maximum size this packet may have */
     size_t max_size;
 
     /* The packet is destined for this transport address.
      * The function we finally use to pass down to the next lower
      * layer lives in the transport structure.
      */
     struct sctp_transport *transport;
 
     /* pointer to the auth chunk for this packet */
     struct sctp_chunk *auth;
 
     u8  has_cookie_echo:1,  /* This packet contains a COOKIE-ECHO chunk. */
         has_sack:1,     /* This packet contains a SACK chunk. */
         has_auth:1,     /* This packet contains an AUTH chunk */
         has_data:1,     /* This packet contains at least 1 DATA chunk */
         ipfragok:1;     /* So let ip fragment this packet */
 };
 
 void sctp_packet_init(struct sctp_packet *, struct sctp_transport *,
               __u16 sport, __u16 dport);
 void sctp_packet_config(struct sctp_packet *, __u32 vtag, int);
 enum sctp_xmit sctp_packet_transmit_chunk(struct sctp_packet *packet,
                       struct sctp_chunk *chunk,
                       int one_packet, gfp_t gfp);
 enum sctp_xmit sctp_packet_append_chunk(struct sctp_packet *packet,
                     struct sctp_chunk *chunk);
 int sctp_packet_transmit(struct sctp_packet *, gfp_t);
 void sctp_packet_free(struct sctp_packet *);
 
 static inline int sctp_packet_empty(struct sctp_packet *packet)
 {
     return packet->size == packet->overhead;
 }
 
 /* This represents a remote transport address.
  * For local transport addresses, we just use union sctp_addr.
  *
  * RFC2960 Section 1.4 Key Terms
  *
  *   o  Transport address:  A Transport Address is traditionally defined
  *  by Network Layer address, Transport Layer protocol and Transport
  *  Layer port number.  In the case of SCTP running over IP, a
  *  transport address is defined by the combination of an IP address
  *  and an SCTP port number (where SCTP is the Transport protocol).
  *
  * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control
  *
  *   o  The sender keeps a separate congestion control parameter set for
  *  each of the destination addresses it can send to (not each
  *  source-destination pair but for each destination).  The parameters
  *  should decay if the address is not used for a long enough time
  *  period.
  *
  */
 struct sctp_transport {
     /* A list of transports. */
     struct list_head transports;
     struct rhlist_head node;
 
     /* Reference counting. */
     refcount_t refcnt;
         /* RTO-Pending : A flag used to track if one of the DATA
          *      chunks sent to this address is currently being
          *      used to compute a RTT. If this flag is 0,
          *      the next DATA chunk sent to this destination
          *      should be used to compute a RTT and this flag
          *      should be set. Every time the RTT
          *      calculation completes (i.e. the DATA chunk
          *      is SACK'd) clear this flag.
          */
     __u32   rto_pending:1,
 
         /*
          * hb_sent : a flag that signals that we have a pending
          * heartbeat.
          */
         hb_sent:1,
 
         /* Is the Path MTU update pending on this tranport */
         pmtu_pending:1,
 
         dst_pending_confirm:1,  /* need to confirm neighbour */
 
         /* Has this transport moved the ctsn since we last sacked */
         sack_generation:1;
     u32 dst_cookie;
 
     struct flowi fl;
 
     /* This is the peer's IP address and port. */
     union sctp_addr ipaddr;
 
     /* These are the functions we call to handle LLP stuff.  */
     struct sctp_af *af_specific;
 
     /* Which association do we belong to?  */
     struct sctp_association *asoc;
 
     /* RFC2960
      *
      * 12.3 Per Transport Address Data
      *
      * For each destination transport address in the peer's
      * address list derived from the INIT or INIT ACK chunk, a
      * number of data elements needs to be maintained including:
      */
     /* RTO         : The current retransmission timeout value.  */
     unsigned long rto;
 
     __u32 rtt;      /* This is the most recent RTT.  */
 
     /* RTTVAR      : The current RTT variation.  */
     __u32 rttvar;
 
     /* SRTT        : The current smoothed round trip time.  */
     __u32 srtt;
 
     /*
      * These are the congestion stats.
      */
     /* cwnd        : The current congestion window.  */
     __u32 cwnd;       /* This is the actual cwnd.  */
 
     /* ssthresh    : The current slow start threshold value.  */
     __u32 ssthresh;
 
     /* partial     : The tracking method for increase of cwnd when in
      * bytes acked : congestion avoidance mode (see Section 6.2.2)
      */
     __u32 partial_bytes_acked;
 
     /* Data that has been sent, but not acknowledged. */
     __u32 flight_size;
 
     __u32 burst_limited;    /* Holds old cwnd when max.burst is applied */
 
     /* Destination */
     struct dst_entry *dst;
     /* Source address. */
     union sctp_addr saddr;
 
     /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
      * the destination address every heartbeat interval.
      */
     unsigned long hbinterval;
     unsigned long probe_interval;
 
     /* SACK delay timeout */
     unsigned long sackdelay;
     __u32 sackfreq;
 
     atomic_t mtu_info;
 
     /* When was the last time that we heard from this transport? We use
      * this to pick new active and retran paths.
      */
     ktime_t last_time_heard;
 
     /* When was the last time that we sent a chunk using this
      * transport? We use this to check for idle transports
      */
     unsigned long last_time_sent;
 
     /* Last time(in jiffies) when cwnd is reduced due to the congestion
      * indication based on ECNE chunk.
      */
     unsigned long last_time_ecne_reduced;
 
     __be16 encap_port;
 
     /* This is the max_retrans value for the transport and will
      * be initialized from the assocs value.  This can be changed
      * using the SCTP_SET_PEER_ADDR_PARAMS socket option.
      */
     __u16 pathmaxrxt;
 
     __u32 flowlabel;
     __u8  dscp;
 
     /* This is the partially failed retrans value for the transport
      * and will be initialized from the assocs value.  This can be changed
      * using the SCTP_PEER_ADDR_THLDS socket option
      */
     __u16 pf_retrans;
     /* Used for primary path switchover. */
     __u16 ps_retrans;
     /* PMTU       : The current known path MTU.  */
     __u32 pathmtu;
 
     /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
     __u32 param_flags;
 
     /* The number of times INIT has been sent on this transport. */
     int init_sent_count;
 
     /* state       : The current state of this destination,
      *             : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN.
      */
     int state;
 
     /* These are the error stats for this destination.  */
 
     /* Error count : The current error count for this destination.  */
     unsigned short error_count;
 
     /* Per         : A timer used by each destination.
      * Destination :
      * Timer       :
      *
      * [Everywhere else in the text this is called T3-rtx. -ed]
      */
     struct timer_list T3_rtx_timer;
 
     /* Heartbeat timer is per destination. */
     struct timer_list hb_timer;
 
     /* Timer to handle ICMP proto unreachable envets */
     struct timer_list proto_unreach_timer;
 
     /* Timer to handler reconf chunk rtx */
     struct timer_list reconf_timer;
 
     /* Timer to send a probe HB packet for PLPMTUD */
     struct timer_list probe_timer;
 
     /* Since we're using per-destination retransmission timers
      * (see above), we're also using per-destination "transmitted"
      * queues.  This probably ought to be a private struct
      * accessible only within the outqueue, but it's not, yet.
      */
     struct list_head transmitted;
 
     /* We build bundle-able packets for this transport here.  */
     struct sctp_packet packet;
 
     /* This is the list of transports that have chunks to send.  */
     struct list_head send_ready;
 
     /* State information saved for SFR_CACC algorithm. The key
      * idea in SFR_CACC is to maintain state at the sender on a
      * per-destination basis when a changeover happens.
      *  char changeover_active;
      *  char cycling_changeover;
      *  __u32 next_tsn_at_change;
      *  char cacc_saw_newack;
      */
     struct {
         /* An unsigned integer, which stores the next TSN to be
          * used by the sender, at the moment of changeover.
          */
         __u32 next_tsn_at_change;
 
         /* A flag which indicates the occurrence of a changeover */
         char changeover_active;
 
         /* A flag which indicates whether the change of primary is
          * the first switch to this destination address during an
          * active switch.
          */
         char cycling_changeover;
 
         /* A temporary flag, which is used during the processing of
          * a SACK to estimate the causative TSN(s)'s group.
          */
         char cacc_saw_newack;
     } cacc;
 
     struct {
         __u16 pmtu;
         __u16 probe_size;
         __u16 probe_high;
         __u8 probe_count;
         __u8 state;
     } pl; /* plpmtud related */
 
     /* 64-bit random number sent with heartbeat. */
     __u64 hb_nonce;
 
     struct rcu_head rcu;
 };
 
 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *,
                       gfp_t);
 void sctp_transport_set_owner(struct sctp_transport *,
                   struct sctp_association *);
 void sctp_transport_route(struct sctp_transport *, union sctp_addr *,
               struct sctp_sock *);
 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk);
 void sctp_transport_free(struct sctp_transport *);
 void sctp_transport_reset_t3_rtx(struct sctp_transport *);
 void sctp_transport_reset_hb_timer(struct sctp_transport *);
 void sctp_transport_reset_reconf_timer(struct sctp_transport *transport);
 void sctp_transport_reset_probe_timer(struct sctp_transport *transport);
 void sctp_transport_reset_raise_timer(struct sctp_transport *transport);
 int sctp_transport_hold(struct sctp_transport *);
 void sctp_transport_put(struct sctp_transport *);
 void sctp_transport_update_rto(struct sctp_transport *, __u32);
 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32);
 void sctp_transport_lower_cwnd(struct sctp_transport *t,
                    enum sctp_lower_cwnd reason);
 void sctp_transport_burst_limited(struct sctp_transport *);
 void sctp_transport_burst_reset(struct sctp_transport *);
 unsigned long sctp_transport_timeout(struct sctp_transport *);
 void sctp_transport_reset(struct sctp_transport *t);
 bool sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu);
 void sctp_transport_immediate_rtx(struct sctp_transport *);
 void sctp_transport_dst_release(struct sctp_transport *t);
 void sctp_transport_dst_confirm(struct sctp_transport *t);
 void sctp_transport_pl_send(struct sctp_transport *t);
 bool sctp_transport_pl_recv(struct sctp_transport *t);
 
 
 /* This is the structure we use to queue packets as they come into
  * SCTP.  We write packets to it and read chunks from it.
  */
 struct sctp_inq {
     /* This is actually a queue of sctp_chunk each
      * containing a partially decoded packet.
      */
     struct list_head in_chunk_list;
     /* This is the packet which is currently off the in queue and is
      * being worked on through the inbound chunk processing.
      */
     struct sctp_chunk *in_progress;
 
     /* This is the delayed task to finish delivering inbound
      * messages.
      */
     struct work_struct immediate;
 };
 
 void sctp_inq_init(struct sctp_inq *);
 void sctp_inq_free(struct sctp_inq *);
 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet);
 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *);
 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *);
 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t);
 
 /* This is the structure we use to hold outbound chunks.  You push
  * chunks in and they automatically pop out the other end as bundled
  * packets (it calls (*output_handler)()).
  *
  * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1,
  * and 8.2 of the v13 draft.
  *
  * It handles retransmissions.  The connection to the timeout portion
  * of the state machine is through sctp_..._timeout() and timeout_handler.
  *
  * If you feed it SACKs, it will eat them.
  *
  * If you give it big chunks, it will fragment them.
  *
  * It assigns TSN's to data chunks.  This happens at the last possible
  * instant before transmission.
  *
  * When free()'d, it empties itself out via output_handler().
  */
 struct sctp_outq {
     struct sctp_association *asoc;
 
     /* Data pending that has never been transmitted.  */
     struct list_head out_chunk_list;
 
     /* Stream scheduler being used */
     struct sctp_sched_ops *sched;
 
     unsigned int out_qlen;  /* Total length of queued data chunks. */
 
     /* Error of send failed, may used in SCTP_SEND_FAILED event. */
     unsigned int error;
 
     /* These are control chunks we want to send.  */
     struct list_head control_chunk_list;
 
     /* These are chunks that have been sacked but are above the
      * CTSN, or cumulative tsn ack point.
      */
     struct list_head sacked;
 
     /* Put chunks on this list to schedule them for
      * retransmission.
      */
     struct list_head retransmit;
 
     /* Put chunks on this list to save them for FWD TSN processing as
      * they were abandoned.
      */
     struct list_head abandoned;
 
     /* How many unackd bytes do we have in-flight?  */
     __u32 outstanding_bytes;
 
     /* Are we doing fast-rtx on this queue */
     char fast_rtx;
 
     /* Corked? */
     char cork;
 };
 
 void sctp_outq_init(struct sctp_association *, struct sctp_outq *);
 void sctp_outq_teardown(struct sctp_outq *);
 void sctp_outq_free(struct sctp_outq*);
 void sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t);
 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *);
 int sctp_outq_is_empty(const struct sctp_outq *);
 void sctp_outq_restart(struct sctp_outq *);
 
 void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport,
              enum sctp_retransmit_reason reason);
 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8);
 void sctp_outq_uncork(struct sctp_outq *, gfp_t gfp);
 void sctp_prsctp_prune(struct sctp_association *asoc,
                struct sctp_sndrcvinfo *sinfo, int msg_len);
 void sctp_generate_fwdtsn(struct sctp_outq *q, __u32 sack_ctsn);
 /* Uncork and flush an outqueue.  */
 static inline void sctp_outq_cork(struct sctp_outq *q)
 {
     q->cork = 1;
 }
 
 /* SCTP skb control block.
  * sctp_input_cb is currently used on rx and sock rx queue
  */
 struct sctp_input_cb {
     union {
         struct inet_skb_parm    h4;
 #if IS_ENABLED(CONFIG_IPV6)
         struct inet6_skb_parm   h6;
 #endif
     } header;
     struct sctp_chunk *chunk;
     struct sctp_af *af;
     __be16 encap_port;
 };
 #define SCTP_INPUT_CB(__skb)    ((struct sctp_input_cb *)&((__skb)->cb[0]))
 
 struct sctp_output_cb {
     struct sk_buff *last;
 };
 #define SCTP_OUTPUT_CB(__skb)   ((struct sctp_output_cb *)&((__skb)->cb[0]))
 
 static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb)
 {
     const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk;
 
     return chunk->head_skb ? : skb;
 }
 
 /* These bind address data fields common between endpoints and associations */
 struct sctp_bind_addr {
 
     /* RFC 2960 12.1 Parameters necessary for the SCTP instance
      *
      * SCTP Port:   The local SCTP port number the endpoint is
      *      bound to.
      */
     __u16 port;
 
     /* RFC 2960 12.1 Parameters necessary for the SCTP instance
      *
      * Address List: The list of IP addresses that this instance
      *  has bound.  This information is passed to one's
      *  peer(s) in INIT and INIT ACK chunks.
      */
     struct list_head address_list;
 };
 
 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port);
 void sctp_bind_addr_free(struct sctp_bind_addr *);
 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest,
             const struct sctp_bind_addr *src,
             enum sctp_scope scope, gfp_t gfp,
             int flags);
 int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
             const struct sctp_bind_addr *src,
             gfp_t gfp);
 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *,
                int new_size, __u8 addr_state, gfp_t gfp);
 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *);
 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *,
              struct sctp_sock *);
 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *,
              struct sctp_sock *, struct sctp_sock *);
 int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
              const union sctp_addr *addr);
 int sctp_bind_addrs_check(struct sctp_sock *sp,
               struct sctp_sock *sp2, int cnt2);
 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr   *bp,
                     const union sctp_addr   *addrs,
                     int         addrcnt,
                     struct sctp_sock    *opt);
 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
                      int *addrs_len,
                      gfp_t gfp);
 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len,
                __u16 port, gfp_t gfp);
 
 enum sctp_scope sctp_scope(const union sctp_addr *addr);
 int sctp_in_scope(struct net *net, const union sctp_addr *addr,
           const enum sctp_scope scope);
 int sctp_is_any(struct sock *sk, const union sctp_addr *addr);
 int sctp_is_ep_boundall(struct sock *sk);
 
 
 /* What type of endpoint?  */
 enum sctp_endpoint_type {
     SCTP_EP_TYPE_SOCKET,
     SCTP_EP_TYPE_ASSOCIATION,
 };
 
 /*
  * A common base class to bridge the implmentation view of a
  * socket (usually listening) endpoint versus an association's
  * local endpoint.
  * This common structure is useful for several purposes:
  *   1) Common interface for lookup routines.
  *  a) Subfunctions work for either endpoint or association
  *  b) Single interface to lookup allows hiding the lookup lock rather
  *     than acquiring it externally.
  *   2) Common interface for the inbound chunk handling/state machine.
  *   3) Common object handling routines for reference counting, etc.
  *   4) Disentangle association lookup from endpoint lookup, where we
  *  do not have to find our endpoint to find our association.
  *
  */
 
 struct sctp_ep_common {
     /* Runtime type information.  What kind of endpoint is this? */
     enum sctp_endpoint_type type;
 
     /* Some fields to help us manage this object.
      *   refcnt   - Reference count access to this object.
      *   dead     - Do not attempt to use this object.
      */
     refcount_t    refcnt;
     bool        dead;
 
     /* What socket does this endpoint belong to?  */
     struct sock *sk;
 
     /* Cache netns and it won't change once set */
     struct net *net;
 
     /* This is where we receive inbound chunks.  */
     struct sctp_inq   inqueue;
 
     /* This substructure includes the defining parameters of the
      * endpoint:
      * bind_addr.port is our shared port number.
      * bind_addr.address_list is our set of local IP addresses.
      */
     struct sctp_bind_addr bind_addr;
 };
 
 
 /* RFC Section 1.4 Key Terms
  *
  * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a
  *   multi-homed host, an SCTP endpoint is represented to its peers as a
  *   combination of a set of eligible destination transport addresses to
  *   which SCTP packets can be sent and a set of eligible source
  *   transport addresses from which SCTP packets can be received.
  *   All transport addresses used by an SCTP endpoint must use the
  *   same port number, but can use multiple IP addresses. A transport
  *   address used by an SCTP endpoint must not be used by another
  *   SCTP endpoint. In other words, a transport address is unique
  *   to an SCTP endpoint.
  *
  * From an implementation perspective, each socket has one of these.
  * A TCP-style socket will have exactly one association on one of
  * these.  An UDP-style socket will have multiple associations hanging
  * off one of these.
  */
 
 struct sctp_endpoint {
     /* Common substructure for endpoint and association. */
     struct sctp_ep_common base;
 
     /* Fields to help us manage our entries in the hash tables. */
     struct hlist_node node;
     int hashent;
 
     /* Associations: A list of current associations and mappings
      *        to the data consumers for each association. This
      *        may be in the form of a hash table or other
      *        implementation dependent structure. The data
      *        consumers may be process identification
      *        information such as file descriptors, named pipe
      *        pointer, or table pointers dependent on how SCTP
      *        is implemented.
      */
     /* This is really a list of struct sctp_association entries. */
     struct list_head asocs;
 
     /* Secret Key: A secret key used by this endpoint to compute
      *        the MAC.  This SHOULD be a cryptographic quality
      *        random number with a sufficient length.
      *        Discussion in [RFC1750] can be helpful in
      *        selection of the key.
      */
     __u8 secret_key[SCTP_SECRET_SIZE];
 
     /* digest:  This is a digest of the sctp cookie.  This field is
      *      only used on the receive path when we try to validate
      *      that the cookie has not been tampered with.  We put
      *      this here so we pre-allocate this once and can re-use
      *      on every receive.
      */
     __u8 *digest;
  
     /* sendbuf acct. policy.    */
     __u32 sndbuf_policy;
 
     /* rcvbuf acct. policy. */
     __u32 rcvbuf_policy;
 
     /* SCTP AUTH: array of the HMACs that will be allocated
      * we need this per association so that we don't serialize
      */
     struct crypto_shash **auth_hmacs;
 
     /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */
      struct sctp_hmac_algo_param *auth_hmacs_list;
 
     /* SCTP-AUTH: chunks to authenticate encoded into parameter */
     struct sctp_chunks_param *auth_chunk_list;
 
     /* SCTP-AUTH: endpoint shared keys */
     struct list_head endpoint_shared_keys;
     __u16 active_key_id;
     __u8  ecn_enable:1,
           auth_enable:1,
           intl_enable:1,
           prsctp_enable:1,
           asconf_enable:1,
           reconf_enable:1;
 
     __u8  strreset_enable;
     struct rcu_head rcu;
 };
 
 /* Recover the outter endpoint structure. */
 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base)
 {
     struct sctp_endpoint *ep;
 
     ep = container_of(base, struct sctp_endpoint, base);
     return ep;
 }
 
 /* These are function signatures for manipulating endpoints.  */
 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t);
 void sctp_endpoint_free(struct sctp_endpoint *);
 void sctp_endpoint_put(struct sctp_endpoint *);
 int sctp_endpoint_hold(struct sctp_endpoint *ep);
 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *);
 struct sctp_association *sctp_endpoint_lookup_assoc(
     const struct sctp_endpoint *ep,
     const union sctp_addr *paddr,
     struct sctp_transport **);
 bool sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
                  const union sctp_addr *paddr);
 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *,
                     struct net *, const union sctp_addr *);
 bool sctp_has_association(struct net *net, const union sctp_addr *laddr,
               const union sctp_addr *paddr);
 
 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
              const struct sctp_association *asoc,
              enum sctp_cid cid, struct sctp_init_chunk *peer_init,
              struct sctp_chunk *chunk, struct sctp_chunk **err_chunk);
 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk,
               const union sctp_addr *peer,
               struct sctp_init_chunk *init, gfp_t gfp);
 __u32 sctp_generate_tag(const struct sctp_endpoint *);
 __u32 sctp_generate_tsn(const struct sctp_endpoint *);
 
 struct sctp_inithdr_host {
     __u32 init_tag;
     __u32 a_rwnd;
     __u16 num_outbound_streams;
     __u16 num_inbound_streams;
     __u32 initial_tsn;
 };
 
 struct sctp_stream_priorities {
     /* List of priorities scheduled */
     struct list_head prio_sched;
     /* List of streams scheduled */
     struct list_head active;
     /* The next stream in line */
     struct sctp_stream_out_ext *next;
     __u16 prio;
 };
 
 struct sctp_stream_out_ext {
     __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1];
     __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1];
     struct list_head outq; /* chunks enqueued by this stream */
     union {
         struct {
             /* Scheduled streams list */
             struct list_head prio_list;
             struct sctp_stream_priorities *prio_head;
         };
         /* Fields used by RR scheduler */
         struct {
             struct list_head rr_list;
         };
     };
 };
 
 struct sctp_stream_out {
     union {
         __u32 mid;
         __u16 ssn;
     };
     __u32 mid_uo;
     struct sctp_stream_out_ext *ext;
     __u8 state;
 };
 
 struct sctp_stream_in {
     union {
         __u32 mid;
         __u16 ssn;
     };
     __u32 mid_uo;
     __u32 fsn;
     __u32 fsn_uo;
     char pd_mode;
     char pd_mode_uo;
 };
 
 struct sctp_stream {
     GENRADIX(struct sctp_stream_out) out;
     GENRADIX(struct sctp_stream_in) in;
 
     __u16 outcnt;
     __u16 incnt;
     /* Current stream being sent, if any */
     struct sctp_stream_out *out_curr;
     union {
         /* Fields used by priority scheduler */
         struct {
             /* List of priorities scheduled */
             struct list_head prio_list;
         };
         /* Fields used by RR scheduler */
         struct {
             /* List of streams scheduled */
             struct list_head rr_list;
             /* The next stream in line */
             struct sctp_stream_out_ext *rr_next;
         };
     };
     struct sctp_stream_interleave *si;
 };
 
 static inline struct sctp_stream_out *sctp_stream_out(
     struct sctp_stream *stream,
     __u16 sid)
 {
     return genradix_ptr(&stream->out, sid);
 }
 
 static inline struct sctp_stream_in *sctp_stream_in(
     struct sctp_stream *stream,
     __u16 sid)
 {
     return genradix_ptr(&stream->in, sid);
 }
 
 #define SCTP_SO(s, i) sctp_stream_out((s), (i))
 #define SCTP_SI(s, i) sctp_stream_in((s), (i))
 
 #define SCTP_STREAM_CLOSED      0x00
 #define SCTP_STREAM_OPEN        0x01
 
 static inline __u16 sctp_datachk_len(const struct sctp_stream *stream)
 {
     return stream->si->data_chunk_len;
 }
 
 static inline __u16 sctp_datahdr_len(const struct sctp_stream *stream)
 {
     return stream->si->data_chunk_len - sizeof(struct sctp_chunkhdr);
 }
 
 static inline __u16 sctp_ftsnchk_len(const struct sctp_stream *stream)
 {
     return stream->si->ftsn_chunk_len;
 }
 
 static inline __u16 sctp_ftsnhdr_len(const struct sctp_stream *stream)
 {
     return stream->si->ftsn_chunk_len - sizeof(struct sctp_chunkhdr);
 }
 
 /* SCTP_GET_ASSOC_STATS counters */
 struct sctp_priv_assoc_stats {
     /* Maximum observed rto in the association during subsequent
      * observations. Value is set to 0 if no RTO measurement took place
      * The transport where the max_rto was observed is returned in
      * obs_rto_ipaddr
      */
     struct sockaddr_storage obs_rto_ipaddr;
     __u64 max_obs_rto;
     /* Total In and Out SACKs received and sent */
     __u64 isacks;
     __u64 osacks;
     /* Total In and Out packets received and sent */
     __u64 opackets;
     __u64 ipackets;
     /* Total retransmitted chunks */
     __u64 rtxchunks;
     /* TSN received > next expected */
     __u64 outofseqtsns;
     /* Duplicate Chunks received */
     __u64 idupchunks;
     /* Gap Ack Blocks received */
     __u64 gapcnt;
     /* Unordered data chunks sent and received */
     __u64 ouodchunks;
     __u64 iuodchunks;
     /* Ordered data chunks sent and received */
     __u64 oodchunks;
     __u64 iodchunks;
     /* Control chunks sent and received */
     __u64 octrlchunks;
     __u64 ictrlchunks;
 };
 
 /* RFC2960
  *
  * 12. Recommended Transmission Control Block (TCB) Parameters
  *
  * This section details a recommended set of parameters that should
  * be contained within the TCB for an implementation. This section is
  * for illustrative purposes and should not be deemed as requirements
  * on an implementation or as an exhaustive list of all parameters
  * inside an SCTP TCB. Each implementation may need its own additional
  * parameters for optimization.
  */
 
 
 /* Here we have information about each individual association. */
 struct sctp_association {
 
     /* A base structure common to endpoint and association.
      * In this context, it represents the associations's view
      * of the local endpoint of the association.
      */
     struct sctp_ep_common base;
 
     /* Associations on the same socket. */
     struct list_head asocs;
 
     /* association id. */
     sctp_assoc_t assoc_id;
 
     /* This is our parent endpoint.  */
     struct sctp_endpoint *ep;
 
     /* These are those association elements needed in the cookie.  */
     struct sctp_cookie c;
 
     /* This is all information about our peer.  */
     struct {
         /* transport_addr_list
          *
          * Peer        : A list of SCTP transport addresses that the
          * Transport   : peer is bound to. This information is derived
          * Address     : from the INIT or INIT ACK and is used to
          * List        : associate an inbound packet with a given
          *         : association. Normally this information is
          *         : hashed or keyed for quick lookup and access
          *         : of the TCB.
          *         : The list is also initialized with the list
          *         : of addresses passed with the sctp_connectx()
          *         : call.
          *
          * It is a list of SCTP_transport's.
          */
         struct list_head transport_addr_list;
 
         /* rwnd
          *
          * Peer Rwnd   : Current calculated value of the peer's rwnd.
          */
         __u32 rwnd;
 
         /* transport_count
          *
          * Peer        : A count of the number of peer addresses
          * Transport   : in the Peer Transport Address List.
          * Address     :
          * Count       :
          */
         __u16 transport_count;
 
         /* port
          *   The transport layer port number.
          */
         __u16 port;
 
         /* primary_path
          *
          * Primary     : This is the current primary destination
          * Path        : transport address of the peer endpoint.  It
          *         : may also specify a source transport address
          *         : on this endpoint.
          *
          * All of these paths live on transport_addr_list.
          *
          * At the bakeoffs, we discovered that the intent of
          * primaryPath is that it only changes when the ULP
          * asks to have it changed.  We add the activePath to
          * designate the connection we are currently using to
          * transmit new data and most control chunks.
          */
         struct sctp_transport *primary_path;
 
         /* Cache the primary path address here, when we
          * need a an address for msg_name.
          */
         union sctp_addr primary_addr;
 
         /* active_path
          *   The path that we are currently using to
          *   transmit new data and most control chunks.
          */
         struct sctp_transport *active_path;
 
         /* retran_path
          *
          * RFC2960 6.4 Multi-homed SCTP Endpoints
          * ...
          * Furthermore, when its peer is multi-homed, an
          * endpoint SHOULD try to retransmit a chunk to an
          * active destination transport address that is
          * different from the last destination address to
          * which the DATA chunk was sent.
          */
         struct sctp_transport *retran_path;
 
         /* Pointer to last transport I have sent on.  */
         struct sctp_transport *last_sent_to;
 
         /* This is the last transport I have received DATA on.  */
         struct sctp_transport *last_data_from;
 
         /*
          * Mapping  An array of bits or bytes indicating which out of
          * Array    order TSN's have been received (relative to the
          *      Last Rcvd TSN). If no gaps exist, i.e. no out of
          *      order packets have been received, this array
          *      will be set to all zero. This structure may be
          *      in the form of a circular buffer or bit array.
          *
          * Last Rcvd   : This is the last TSN received in
          * TSN         : sequence. This value is set initially by
          *         : taking the peer's Initial TSN, received in
          *         : the INIT or INIT ACK chunk, and subtracting
          *         : one from it.
          *
          * Throughout most of the specification this is called the
          * "Cumulative TSN ACK Point".  In this case, we
          * ignore the advice in 12.2 in favour of the term
          * used in the bulk of the text.  This value is hidden
          * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn().
          */
         struct sctp_tsnmap tsn_map;
 
         /* This mask is used to disable sending the ASCONF chunk
          * with specified parameter to peer.
          */
         __be16 addip_disabled_mask;
 
         /* These are capabilities which our peer advertised.  */
         __u16   ecn_capable:1,      /* Can peer do ECN? */
             ipv4_address:1,     /* Peer understands IPv4 addresses? */
             ipv6_address:1,     /* Peer understands IPv6 addresses? */
             hostname_address:1, /* Peer understands DNS addresses? */
             asconf_capable:1,   /* Does peer support ADDIP? */
             prsctp_capable:1,   /* Can peer do PR-SCTP? */
             reconf_capable:1,   /* Can peer do RE-CONFIG? */
             intl_capable:1,     /* Can peer do INTERLEAVE */
             auth_capable:1,     /* Is peer doing SCTP-AUTH? */
             /* sack_needed:
              *   This flag indicates if the next received
              *   packet is to be responded to with a
              *   SACK. This is initialized to 0.  When a packet
              *   is received sack_cnt is incremented. If this value
              *   reaches 2 or more, a SACK is sent and the
              *   value is reset to 0. Note: This is used only
              *   when no DATA chunks are received out of
              *   order.  When DATA chunks are out of order,
              *   SACK's are not delayed (see Section 6).
              */
             sack_needed:1,     /* Do we need to sack the peer? */
             sack_generation:1,
             zero_window_announced:1;
 
         __u32   sack_cnt;
 
         __u32   adaptation_ind;  /* Adaptation Code point. */
 
         struct sctp_inithdr_host i;
         void *cookie;
         int cookie_len;
 
         /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk.
          * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the
          * Initial TSN Value minus 1
          */
         __u32 addip_serial;
 
         /* SCTP-AUTH: We need to know pears random number, hmac list
          * and authenticated chunk list.  All that is part of the
          * cookie and these are just pointers to those locations
          */
         struct sctp_random_param *peer_random;
         struct sctp_chunks_param *peer_chunks;
         struct sctp_hmac_algo_param *peer_hmacs;
     } peer;
 
     /* State       : A state variable indicating what state the
      *         : association is in, i.e. COOKIE-WAIT,
      *         : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING,
      *         : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT.
      *
      *      Note: No "CLOSED" state is illustrated since if a
      *      association is "CLOSED" its TCB SHOULD be removed.
      *
      *      In this implementation we DO have a CLOSED
      *      state which is used during initiation and shutdown.
      *
      *      State takes values from SCTP_STATE_*.
      */
     enum sctp_state state;
 
     /* Overall     : The overall association error count.
      * Error Count : [Clear this any time I get something.]
      */
     int overall_error_count;
 
     /* The cookie life I award for any cookie.  */
     ktime_t cookie_life;
 
     /* These are the association's initial, max, and min RTO values.
      * These values will be initialized by system defaults, but can
      * be modified via the SCTP_RTOINFO socket option.
      */
     unsigned long rto_initial;
     unsigned long rto_max;
     unsigned long rto_min;
 
     /* Maximum number of new data packets that can be sent in a burst.  */
     int max_burst;
 
     /* This is the max_retrans value for the association.  This value will
      * be initialized from system defaults, but can be
      * modified by the SCTP_ASSOCINFO socket option.
      */
     int max_retrans;
 
     /* This is the partially failed retrans value for the transport
      * and will be initialized from the assocs value.  This can be
      * changed using the SCTP_PEER_ADDR_THLDS socket option
      */
     __u16 pf_retrans;
     /* Used for primary path switchover. */
     __u16 ps_retrans;
 
     /* Maximum number of times the endpoint will retransmit INIT  */
     __u16 max_init_attempts;
 
     /* How many times have we resent an INIT? */
     __u16 init_retries;
 
     /* The largest timeout or RTO value to use in attempting an INIT */
     unsigned long max_init_timeo;
 
     /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
      * the destination address every heartbeat interval. This value
      * will be inherited by all new transports.
      */
     unsigned long hbinterval;
     unsigned long probe_interval;
 
     __be16 encap_port;
 
     /* This is the max_retrans value for new transports in the
      * association.
      */
     __u16 pathmaxrxt;
 
     __u32 flowlabel;
     __u8  dscp;
 
     /* Flag that path mtu update is pending */
     __u8   pmtu_pending;
 
     /* Association : The smallest PMTU discovered for all of the
      * PMTU        : peer's transport addresses.
      */
     __u32 pathmtu;
 
     /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
     __u32 param_flags;
 
     __u32 sackfreq;
     /* SACK delay timeout */
     unsigned long sackdelay;
 
     unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES];
     struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES];
 
     /* Transport to which SHUTDOWN chunk was last sent.  */
     struct sctp_transport *shutdown_last_sent_to;
 
     /* Transport to which INIT chunk was last sent.  */
     struct sctp_transport *init_last_sent_to;
 
     /* How many times have we resent a SHUTDOWN */
     int shutdown_retries;
 
     /* Next TSN    : The next TSN number to be assigned to a new
      *         : DATA chunk.  This is sent in the INIT or INIT
      *         : ACK chunk to the peer and incremented each
      *         : time a DATA chunk is assigned a TSN
      *         : (normally just prior to transmit or during
      *         : fragmentation).
      */
     __u32 next_tsn;
 
     /*
      * Last Rcvd   : This is the last TSN received in sequence.  This value
      * TSN         : is set initially by taking the peer's Initial TSN,
      *         : received in the INIT or INIT ACK chunk, and
      *         : subtracting one from it.
      *
      * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point.
      */
 
     __u32 ctsn_ack_point;
 
     /* PR-SCTP Advanced.Peer.Ack.Point */
     __u32 adv_peer_ack_point;
 
     /* Highest TSN that is acknowledged by incoming SACKs. */
     __u32 highest_sacked;
 
     /* TSN marking the fast recovery exit point */
     __u32 fast_recovery_exit;
 
     /* Flag to track the current fast recovery state */
     __u8 fast_recovery;
 
     /* The number of unacknowledged data chunks.  Reported through
      * the SCTP_STATUS sockopt.
      */
     __u16 unack_data;
 
     /* The total number of data chunks that we've had to retransmit
      * as the result of a T3 timer expiration
      */
     __u32 rtx_data_chunks;
 
     /* This is the association's receive buffer space.  This value is used
      * to set a_rwnd field in an INIT or a SACK chunk.
      */
     __u32 rwnd;
 
     /* This is the last advertised value of rwnd over a SACK chunk. */
     __u32 a_rwnd;
 
     /* Number of bytes by which the rwnd has slopped.  The rwnd is allowed
      * to slop over a maximum of the association's frag_point.
      */
     __u32 rwnd_over;
 
     /* Keeps treack of rwnd pressure.  This happens when we have
      * a window, but not recevie buffer (i.e small packets).  This one
      * is releases slowly (1 PMTU at a time ).
      */
     __u32 rwnd_press;
 
     /* This is the sndbuf size in use for the association.
      * This corresponds to the sndbuf size for the association,
      * as specified in the sk->sndbuf.
      */
     int sndbuf_used;
 
     /* This is the amount of memory that this association has allocated
      * in the receive path at any given time.
      */
     atomic_t rmem_alloc;
 
     /* This is the wait queue head for send requests waiting on
      * the association sndbuf space.
      */
     wait_queue_head_t   wait;
 
     /* The message size at which SCTP fragmentation will occur. */
     __u32 frag_point;
     __u32 user_frag;
 
     /* Counter used to count INIT errors. */
     int init_err_counter;
 
     /* Count the number of INIT cycles (for doubling timeout). */
     int init_cycle;
 
     /* Default send parameters. */
     __u16 default_stream;
     __u16 default_flags;
     __u32 default_ppid;
     __u32 default_context;
     __u32 default_timetolive;
 
     /* Default receive parameters */
     __u32 default_rcv_context;
 
     /* Stream arrays */
     struct sctp_stream stream;
 
     /* All outbound chunks go through this structure.  */
     struct sctp_outq outqueue;
 
     /* A smart pipe that will handle reordering and fragmentation,
      * as well as handle passing events up to the ULP.
      */
     struct sctp_ulpq ulpq;
 
     /* Last TSN that caused an ECNE Chunk to be sent.  */
     __u32 last_ecne_tsn;
 
     /* Last TSN that caused a CWR Chunk to be sent.  */
     __u32 last_cwr_tsn;
 
     /* How many duplicated TSNs have we seen?  */
     int numduptsns;
 
     /* These are to support
      * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses
      *  and Enforcement of Flow and Message Limits"
      * <draft-ietf-tsvwg-addip-sctp-02.txt>
      * or "ADDIP" for short.
      */
 
 
 
     /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
      *
      * R1) One and only one ASCONF Chunk MAY be in transit and
      * unacknowledged at any one time.  If a sender, after sending
      * an ASCONF chunk, decides it needs to transfer another
      * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
      * returns from the previous ASCONF Chunk before sending a
      * subsequent ASCONF. Note this restriction binds each side,
      * so at any time two ASCONF may be in-transit on any given
      * association (one sent from each endpoint).
      *
      * [This is our one-and-only-one ASCONF in flight.  If we do
      * not have an ASCONF in flight, this is NULL.]
      */
     struct sctp_chunk *addip_last_asconf;
 
     /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk.
      *
      * This is needed to implement itmes E1 - E4 of the updated
      * spec.  Here is the justification:
      *
      * Since the peer may bundle multiple ASCONF chunks toward us,
      * we now need the ability to cache multiple ACKs.  The section
      * describes in detail how they are cached and cleaned up.
      */
     struct list_head asconf_ack_list;
 
     /* These ASCONF chunks are waiting to be sent.
      *
      * These chunaks can't be pushed to outqueue until receiving
      * ASCONF_ACK for the previous ASCONF indicated by
      * addip_last_asconf, so as to guarantee that only one ASCONF
      * is in flight at any time.
      *
      * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
      *
      * In defining the ASCONF Chunk transfer procedures, it is
      * essential that these transfers MUST NOT cause congestion
      * within the network.  To achieve this, we place these
      * restrictions on the transfer of ASCONF Chunks:
      *
      * R1) One and only one ASCONF Chunk MAY be in transit and
      * unacknowledged at any one time.  If a sender, after sending
      * an ASCONF chunk, decides it needs to transfer another
      * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
      * returns from the previous ASCONF Chunk before sending a
      * subsequent ASCONF. Note this restriction binds each side,
      * so at any time two ASCONF may be in-transit on any given
      * association (one sent from each endpoint).
      *
      *
      * [I really think this is EXACTLY the sort of intelligence
      *  which already resides in sctp_outq.  Please move this
      *  queue and its supporting logic down there.  --piggy]
      */
     struct list_head addip_chunk_list;
 
     /* ADDIP Section 4.1 ASCONF Chunk Procedures
      *
      * A2) A serial number should be assigned to the Chunk. The
      * serial number SHOULD be a monotonically increasing
      * number. The serial number SHOULD be initialized at
      * the start of the association to the same value as the
      * Initial TSN and every time a new ASCONF chunk is created
      * it is incremented by one after assigning the serial number
      * to the newly created chunk.
      *
      * ADDIP
      * 3.1.1  Address/Stream Configuration Change Chunk (ASCONF)
      *
      * Serial Number : 32 bits (unsigned integer)
      *
      * This value represents a Serial Number for the ASCONF
      * Chunk. The valid range of Serial Number is from 0 to
      * 4294967295 (2^32 - 1).  Serial Numbers wrap back to 0
      * after reaching 4294967295.
      */
     __u32 addip_serial;
     int src_out_of_asoc_ok;
     union sctp_addr *asconf_addr_del_pending;
     struct sctp_transport *new_transport;
 
     /* SCTP AUTH: list of the endpoint shared keys.  These
      * keys are provided out of band by the user applicaton
      * and can't change during the lifetime of the association
      */
     struct list_head endpoint_shared_keys;
 
     /* SCTP AUTH:
      * The current generated assocaition shared key (secret)
      */
     struct sctp_auth_bytes *asoc_shared_key;
     struct sctp_shared_key *shkey;
 
     /* SCTP AUTH: hmac id of the first peer requested algorithm
      * that we support.
      */
     __u16 default_hmac_id;
 
     __u16 active_key_id;
 
     __u8 need_ecne:1,   /* Need to send an ECNE Chunk? */
          temp:1,        /* Is it a temporary association? */
          pf_expose:2,       /* Expose pf state? */
          force_delay:1;
 
     __u8 strreset_enable;
     __u8 strreset_outstanding; /* request param count on the fly */
 
     __u32 strreset_outseq; /* Update after receiving response */
     __u32 strreset_inseq; /* Update after receiving request */
     __u32 strreset_result[2]; /* save the results of last 2 responses */
 
     struct sctp_chunk *strreset_chunk; /* save request chunk */
 
     struct sctp_priv_assoc_stats stats;
 
     int sent_cnt_removable;
 
     __u16 subscribe;
 
     __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1];
     __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1];
 
     /* Security identifiers from incoming (INIT). These are set by
      * security_sctp_assoc_request(). These will only be used by
      * SCTP TCP type sockets and peeled off connections as they
      * cause a new socket to be generated. security_sctp_sk_clone()
      * will then plug these into the new socket.
      */
 
     u32 secid;
     u32 peer_secid;
 
     struct rcu_head rcu;
 };
 
 
 /* An eyecatcher for determining if we are really looking at an
  * association data structure.
  */
 enum {
     SCTP_ASSOC_EYECATCHER = 0xa550c123,
 };
 
 /* Recover the outter association structure. */
 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base)
 {
     struct sctp_association *asoc;
 
     asoc = container_of(base, struct sctp_association, base);
     return asoc;
 }
 
 /* These are function signatures for manipulating associations.  */
 
 
 struct sctp_association *
 sctp_association_new(const struct sctp_endpoint *ep, const struct sock *sk,
              enum sctp_scope scope, gfp_t gfp);
 void sctp_association_free(struct sctp_association *);
 void sctp_association_put(struct sctp_association *);
 void sctp_association_hold(struct sctp_association *);
 
 struct sctp_transport *sctp_assoc_choose_alter_transport(
     struct sctp_association *, struct sctp_transport *);
 void sctp_assoc_update_retran_path(struct sctp_association *);
 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *,
                       const union sctp_addr *);
 int sctp_assoc_lookup_laddr(struct sctp_association *asoc,
                 const union sctp_addr *laddr);
 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *,
                      const union sctp_addr *address,
                      const gfp_t gfp,
                      const int peer_state);
 void sctp_assoc_del_peer(struct sctp_association *asoc,
              const union sctp_addr *addr);
 void sctp_assoc_rm_peer(struct sctp_association *asoc,
              struct sctp_transport *peer);
 void sctp_assoc_control_transport(struct sctp_association *asoc,
                   struct sctp_transport *transport,
                   enum sctp_transport_cmd command,
                   sctp_sn_error_t error);
 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32);
 void sctp_assoc_migrate(struct sctp_association *, struct sock *);
 int sctp_assoc_update(struct sctp_association *old,
               struct sctp_association *new);
 
 __u32 sctp_association_get_next_tsn(struct sctp_association *);
 
 void sctp_assoc_update_frag_point(struct sctp_association *asoc);
 void sctp_assoc_set_pmtu(struct sctp_association *asoc, __u32 pmtu);
 void sctp_assoc_sync_pmtu(struct sctp_association *asoc);
 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int);
 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int);
 void sctp_assoc_set_primary(struct sctp_association *,
                 struct sctp_transport *);
 void sctp_assoc_del_nonprimary_peers(struct sctp_association *,
                     struct sctp_transport *);
 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc,
                      enum sctp_scope scope, gfp_t gfp);
 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *,
                      struct sctp_cookie*,
                      gfp_t gfp);
 int sctp_assoc_set_id(struct sctp_association *, gfp_t);
 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc);
 struct sctp_chunk *sctp_assoc_lookup_asconf_ack(
                     const struct sctp_association *asoc,
                     __be32 serial);
 void sctp_asconf_queue_teardown(struct sctp_association *asoc);
 
 int sctp_cmp_addr_exact(const union sctp_addr *ss1,
             const union sctp_addr *ss2);
 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc);
 
 /* A convenience structure to parse out SCTP specific CMSGs. */
 struct sctp_cmsgs {
     struct sctp_initmsg *init;
     struct sctp_sndrcvinfo *srinfo;
     struct sctp_sndinfo *sinfo;
     struct sctp_prinfo *prinfo;
     struct sctp_authinfo *authinfo;
     struct msghdr *addrs_msg;
 };
 
 /* Structure for tracking memory objects */
 struct sctp_dbg_objcnt_entry {
     char *label;
     atomic_t *counter;
 };
 
 #endif /* __sctp_structs_h__ */

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