| /* SCTP kernel reference 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 reference Implementation |
| * |
| * The SCTP reference implementation is free software; |
| * you can redistribute it and/or modify it under the terms of |
| * the GNU General Public License as published by |
| * the Free Software Foundation; either version 2, or (at your option) |
| * any later version. |
| * |
| * The SCTP reference implementation is distributed in the hope that it |
| * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| * ************************ |
| * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| * See the GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with GNU CC; see the file COPYING. If not, write to |
| * the Free Software Foundation, 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, USA. |
| * |
| * Please send any bug reports or fixes you make to the |
| * email addresses: |
| * lksctp developers <lksctp-developers@lists.sourceforge.net> |
| * |
| * Or submit a bug report through the following website: |
| * http://www.sf.net/projects/lksctp |
| * |
| * 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> |
| * |
| * Any bugs reported given to us we will try to fix... any fixes shared will |
| * be incorporated into the next SCTP release. |
| */ |
| |
| #ifndef __sctp_structs_h__ |
| #define __sctp_structs_h__ |
| |
| #include <linux/time.h> /* We get struct timespec. */ |
| #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 <asm/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. */ |
| |
| /* 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 sctp_ssnmap; |
| |
| |
| #include <net/sctp/tsnmap.h> |
| #include <net/sctp/ulpevent.h> |
| #include <net/sctp/ulpqueue.h> |
| |
| /* Structures useful for managing bind/connect. */ |
| |
| struct sctp_bind_bucket { |
| unsigned short port; |
| unsigned short fastreuse; |
| struct sctp_bind_bucket *next; |
| struct sctp_bind_bucket **pprev; |
| struct hlist_head owner; |
| }; |
| |
| struct sctp_bind_hashbucket { |
| spinlock_t lock; |
| struct sctp_bind_bucket *chain; |
| }; |
| |
| /* Used for hashing all associations. */ |
| struct sctp_hashbucket { |
| rwlock_t lock; |
| struct sctp_ep_common *chain; |
| } __attribute__((__aligned__(8))); |
| |
| |
| /* The SCTP globals structure. */ |
| extern struct sctp_globals { |
| /* RFC2960 Section 14. Suggested SCTP Protocol Parameter Values |
| * |
| * The following protocol parameters are RECOMMENDED: |
| * |
| * RTO.Initial - 3 seconds |
| * RTO.Min - 1 second |
| * RTO.Max - 60 seconds |
| * RTO.Alpha - 1/8 (3 when converted to right shifts.) |
| * RTO.Beta - 1/4 (2 when converted to right shifts.) |
| */ |
| __u32 rto_initial; |
| __u32 rto_min; |
| __u32 rto_max; |
| |
| /* Note: rto_alpha and rto_beta are really defined as inverse |
| * powers of two to facilitate integer operations. |
| */ |
| int rto_alpha; |
| int rto_beta; |
| |
| /* Max.Burst - 4 */ |
| int max_burst; |
| |
| /* Valid.Cookie.Life - 60 seconds */ |
| int valid_cookie_life; |
| |
| /* Whether Cookie Preservative is enabled(1) or not(0) */ |
| int cookie_preserve_enable; |
| |
| /* Association.Max.Retrans - 10 attempts |
| * Path.Max.Retrans - 5 attempts (per destination address) |
| * Max.Init.Retransmits - 8 attempts |
| */ |
| int max_retrans_association; |
| int max_retrans_path; |
| int max_retrans_init; |
| |
| /* |
| * Policy for preforming sctp/socket accounting |
| * 0 - do socket level accounting, all assocs share sk_sndbuf |
| * 1 - do sctp accounting, each asoc may use sk_sndbuf bytes |
| */ |
| int sndbuf_policy; |
| |
| /* Delayed SACK timeout 200ms default*/ |
| int sack_timeout; |
| |
| /* HB.interval - 30 seconds */ |
| int hb_interval; |
| |
| /* The following variables are implementation specific. */ |
| |
| /* Default initialization values to be applied to new associations. */ |
| __u16 max_instreams; |
| __u16 max_outstreams; |
| |
| /* 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. */ |
| int ep_hashsize; |
| struct sctp_hashbucket *ep_hashtable; |
| |
| /* This is the hash of all associations. */ |
| int assoc_hashsize; |
| struct sctp_hashbucket *assoc_hashtable; |
| |
| /* This is the sctp port control hash. */ |
| int port_hashsize; |
| int port_rover; |
| spinlock_t port_alloc_lock; /* Protects port_rover. */ |
| struct sctp_bind_hashbucket *port_hashtable; |
| |
| /* This is the global local address list. |
| * We actively maintain this complete list of interfaces on |
| * the system by catching routing events. |
| * |
| * It is a list of sctp_sockaddr_entry. |
| */ |
| struct list_head local_addr_list; |
| spinlock_t local_addr_lock; |
| |
| /* Flag to indicate if addip is enabled. */ |
| int addip_enable; |
| |
| /* Flag to indicate if PR-SCTP is enabled. */ |
| int prsctp_enable; |
| } sctp_globals; |
| |
| #define sctp_rto_initial (sctp_globals.rto_initial) |
| #define sctp_rto_min (sctp_globals.rto_min) |
| #define sctp_rto_max (sctp_globals.rto_max) |
| #define sctp_rto_alpha (sctp_globals.rto_alpha) |
| #define sctp_rto_beta (sctp_globals.rto_beta) |
| #define sctp_max_burst (sctp_globals.max_burst) |
| #define sctp_valid_cookie_life (sctp_globals.valid_cookie_life) |
| #define sctp_cookie_preserve_enable (sctp_globals.cookie_preserve_enable) |
| #define sctp_max_retrans_association (sctp_globals.max_retrans_association) |
| #define sctp_sndbuf_policy (sctp_globals.sndbuf_policy) |
| #define sctp_max_retrans_path (sctp_globals.max_retrans_path) |
| #define sctp_max_retrans_init (sctp_globals.max_retrans_init) |
| #define sctp_sack_timeout (sctp_globals.sack_timeout) |
| #define sctp_hb_interval (sctp_globals.hb_interval) |
| #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_assoc_hashsize (sctp_globals.assoc_hashsize) |
| #define sctp_assoc_hashtable (sctp_globals.assoc_hashtable) |
| #define sctp_port_hashsize (sctp_globals.port_hashsize) |
| #define sctp_port_rover (sctp_globals.port_rover) |
| #define sctp_port_alloc_lock (sctp_globals.port_alloc_lock) |
| #define sctp_port_hashtable (sctp_globals.port_hashtable) |
| #define sctp_local_addr_list (sctp_globals.local_addr_list) |
| #define sctp_local_addr_lock (sctp_globals.local_addr_lock) |
| #define sctp_addip_enable (sctp_globals.addip_enable) |
| #define sctp_prsctp_enable (sctp_globals.prsctp_enable) |
| |
| /* SCTP Socket type: UDP or TCP style. */ |
| typedef enum { |
| SCTP_SOCKET_UDP = 0, |
| SCTP_SOCKET_UDP_HIGH_BANDWIDTH, |
| SCTP_SOCKET_TCP |
| } sctp_socket_type_t; |
| |
| /* 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? */ |
| sctp_socket_type_t type; |
| |
| /* PF_ family specific functions. */ |
| struct sctp_pf *pf; |
| |
| /* Access to HMAC transform. */ |
| struct crypto_tfm *hmac; |
| |
| /* 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; |
| |
| struct sctp_initmsg initmsg; |
| struct sctp_rtoinfo rtoinfo; |
| struct sctp_paddrparams paddrparam; |
| struct sctp_event_subscribe subscribe; |
| struct sctp_assocparams assocparams; |
| int user_frag; |
| __u32 autoclose; |
| __u8 nodelay; |
| __u8 disable_fragments; |
| __u8 pd_mode; |
| __u8 v4mapped; |
| __u32 adaption_ind; |
| |
| /* Receive to here while partial delivery is in effect. */ |
| struct sk_buff_head pd_lobby; |
| }; |
| |
| 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 defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 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? */ |
| struct timeval 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 adaption_ind; |
| |
| |
| /* 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[0]; |
| }; |
| |
| |
| /* The format of our cookie that we send to our peer. */ |
| struct sctp_signed_cookie { |
| __u8 signature[SCTP_SECRET_SIZE]; |
| struct sctp_cookie c; |
| }; |
| |
| /* 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_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_adaption_ind_param *aind; |
| }; |
| |
| /* 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). |
| */ |
| typedef struct sctp_sender_hb_info { |
| struct sctp_paramhdr param_hdr; |
| union sctp_addr daddr; |
| unsigned long sent_at; |
| } __attribute__((packed)) sctp_sender_hb_info_t; |
| |
| /* |
| * RFC 2960 1.3.2 Sequenced Delivery within Streams |
| * |
| * The term "stream" is used in SCTP to refer to a sequence of user |
| * messages that are to be delivered to the upper-layer protocol in |
| * order with respect to other messages within the same stream. This is |
| * in contrast to its usage in TCP, where it refers to a sequence of |
| * bytes (in this document a byte is assumed to be eight bits). |
| * ... |
| * |
| * This is the structure we use to track both our outbound and inbound |
| * SSN, or Stream Sequence Numbers. |
| */ |
| |
| struct sctp_stream { |
| __u16 *ssn; |
| unsigned int len; |
| }; |
| |
| struct sctp_ssnmap { |
| struct sctp_stream in; |
| struct sctp_stream out; |
| int malloced; |
| }; |
| |
| struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, int gfp); |
| void sctp_ssnmap_free(struct sctp_ssnmap *map); |
| void sctp_ssnmap_clear(struct sctp_ssnmap *map); |
| |
| /* What is the current SSN number for this stream? */ |
| static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) |
| { |
| return stream->ssn[id]; |
| } |
| |
| /* Return the next SSN number for this stream. */ |
| static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) |
| { |
| return stream->ssn[id]++; |
| } |
| |
| /* Skip over this ssn and all below. */ |
| static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, |
| __u16 ssn) |
| { |
| stream->ssn[id] = ssn+1; |
| } |
| |
| /* |
| * 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 ipfragok); |
| int (*setsockopt) (struct sock *sk, |
| int level, |
| int optname, |
| char __user *optval, |
| int optlen); |
| int (*getsockopt) (struct sock *sk, |
| int level, |
| int optname, |
| char __user *optval, |
| int __user *optlen); |
| struct dst_entry *(*get_dst) (struct sctp_association *asoc, |
| union sctp_addr *daddr, |
| union sctp_addr *saddr); |
| void (*get_saddr) (struct sctp_association *asoc, |
| struct dst_entry *dst, |
| union sctp_addr *daddr, |
| union sctp_addr *saddr); |
| void (*copy_addrlist) (struct list_head *, |
| struct net_device *); |
| void (*dst_saddr) (union sctp_addr *saddr, |
| struct dst_entry *dst, |
| unsigned short port); |
| 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); |
| void (*to_sk_saddr) (union sctp_addr *, |
| struct sock *sk); |
| void (*to_sk_daddr) (union sctp_addr *, |
| struct sock *sk); |
| void (*from_addr_param) (union sctp_addr *, |
| union sctp_addr_param *, |
| __u16 port, int iif); |
| int (*to_addr_param) (const union sctp_addr *, |
| union sctp_addr_param *); |
| int (*addr_valid) (union sctp_addr *, |
| struct sctp_sock *); |
| sctp_scope_t (*scope) (union sctp_addr *); |
| void (*inaddr_any) (union sctp_addr *, unsigned short); |
| 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); |
| __u16 net_header_len; |
| int sockaddr_len; |
| 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 *, __u16 *); |
| struct sock *(*create_accept_sk) (struct sock *sk, |
| struct sctp_association *asoc); |
| void (*addr_v4map) (struct sctp_sock *, union sctp_addr *); |
| 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; |
| /* Chunks that have been transmitted. */ |
| struct list_head track; |
| /* Reference counting. */ |
| atomic_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; |
| char send_failed; |
| /* Control whether chunks from this message can be abandoned. */ |
| char can_abandon; |
| }; |
| |
| struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, |
| struct sctp_sndrcvinfo *, |
| struct msghdr *, int len); |
| void sctp_datamsg_put(struct sctp_datamsg *); |
| void sctp_datamsg_free(struct sctp_datamsg *); |
| void sctp_datamsg_track(struct sctp_chunk *); |
| 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 { |
| /* These first three elements MUST PRECISELY match the first |
| * three elements of struct sk_buff. This allows us to reuse |
| * all the skb_* queue management functions. |
| */ |
| struct sctp_chunk *next; |
| struct sctp_chunk *prev; |
| struct sk_buff_head *list; |
| atomic_t refcnt; |
| |
| /* This is our link to the per-transport transmitted list. */ |
| struct list_head transmitted_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; |
| |
| /* 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; |
| } 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; |
| |
| __u8 rtt_in_progress; /* Is this chunk used for RTT calculation? */ |
| __u8 resent; /* Has this chunk ever been retransmitted. */ |
| __u8 has_tsn; /* Does this chunk have a TSN yet? */ |
| __u8 has_ssn; /* Does this chunk have a SSN yet? */ |
| __u8 singleton; /* Was this the only chunk in the packet? */ |
| __u8 end_of_packet; /* Was this the last chunk in the packet? */ |
| __u8 ecn_ce_done; /* Have we processed the ECN CE bit? */ |
| __u8 pdiscard; /* Discard the whole packet now? */ |
| __u8 tsn_gap_acked; /* Is this chunk acked by a GAP ACK? */ |
| __u8 fast_retransmit; /* Is this chunk fast retransmitted? */ |
| __u8 tsn_missing_report; /* Data chunk missing counter. */ |
| }; |
| |
| void sctp_chunk_hold(struct sctp_chunk *); |
| void sctp_chunk_put(struct sctp_chunk *); |
| int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, |
| struct iovec *data); |
| 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 *); |
| void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, |
| union sctp_addr *); |
| const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); |
| |
| /* This is a structure for holding either an IPv6 or an IPv4 address. */ |
| /* sin_family -- AF_INET or AF_INET6 |
| * sin_port -- ordinary port number |
| * sin_addr -- cast to either (struct in_addr) or (struct in6_addr) |
| */ |
| struct sctp_sockaddr_entry { |
| struct list_head list; |
| union sctp_addr a; |
| }; |
| |
| typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); |
| |
| /* 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 sk_buff_head chunks; |
| |
| /* 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; |
| |
| /* 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; |
| |
| /* This packet contains a COOKIE-ECHO chunk. */ |
| char has_cookie_echo; |
| |
| /* This packet containsa SACK chunk. */ |
| char has_sack; |
| |
| /* SCTP cannot fragment this packet. So let ip fragment it. */ |
| char ipfragok; |
| |
| int malloced; |
| }; |
| |
| struct sctp_packet *sctp_packet_init(struct sctp_packet *, |
| struct sctp_transport *, |
| __u16 sport, __u16 dport); |
| struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); |
| sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, |
| struct sctp_chunk *); |
| sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, |
| struct sctp_chunk *); |
| int sctp_packet_transmit(struct sctp_packet *); |
| 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; |
| |
| /* Reference counting. */ |
| atomic_t refcnt; |
| int dead; |
| |
| /* 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: |
| */ |
| __u32 rtt; /* This is the most recent RTT. */ |
| |
| /* RTO : The current retransmission timeout value. */ |
| __u32 rto; |
| |
| /* RTTVAR : The current RTT variation. */ |
| __u32 rttvar; |
| |
| /* SRTT : The current smoothed round trip time. */ |
| __u32 srtt; |
| |
| /* 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. |
| */ |
| int rto_pending; |
| |
| /* |
| * 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; |
| |
| /* PMTU : The current known path MTU. */ |
| __u32 pmtu; |
| |
| /* Destination */ |
| struct dst_entry *dst; |
| /* Source address. */ |
| union sctp_addr saddr; |
| |
| /* When was the last time(in jiffies) that a data packet was sent on |
| * this transport? This is used to adjust the cwnd when the transport |
| * becomes inactive. |
| */ |
| unsigned long last_time_used; |
| |
| /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
| * the destination address every heartbeat interval. |
| */ |
| int hb_interval; |
| |
| /* When was the last time (in jiffies) that we heard from this |
| * transport? We use this to pick new active and retran paths. |
| */ |
| unsigned long last_time_heard; |
| |
| /* Last time(in jiffies) when cwnd is reduced due to the congestion |
| * indication based on ECNE chunk. |
| */ |
| unsigned long last_time_ecne_reduced; |
| |
| /* 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_UNKOWN. |
| */ |
| int state; |
| |
| /* hb_allowed : The current heartbeat state of this destination, |
| * : i.e. ALLOW-HB, NO-HEARTBEAT, etc. |
| */ |
| int hb_allowed; |
| |
| /* These are the error stats for this destination. */ |
| |
| /* Error count : The current error count for this destination. */ |
| unsigned short error_count; |
| |
| /* This is the max_retrans value for the transport and will |
| * be initialized to proto.max_retrans.path. This can be changed |
| * using SCTP_SET_PEER_ADDR_PARAMS socket option. |
| */ |
| int max_retrans; |
| |
| /* 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; |
| |
| /* 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; |
| |
| int malloced; /* Is this structure kfree()able? */ |
| |
| /* 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 sctp_transport *sctp_transport_new(const union sctp_addr *, int); |
| 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 *); |
| void sctp_transport_free(struct sctp_transport *); |
| void sctp_transport_reset_timers(struct sctp_transport *); |
| void 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 *, sctp_lower_cwnd_t); |
| unsigned long sctp_transport_timeout(struct sctp_transport *); |
| |
| |
| /* 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 sk_buff_head in; |
| /* 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; |
| |
| int malloced; /* Is this structure kfree()able? */ |
| }; |
| |
| 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 *); |
| void sctp_inq_set_th_handler(struct sctp_inq *, void (*)(void *), void *); |
| |
| /* 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 sk_buff_head out; |
| |
| unsigned out_qlen; /* Total length of queued data chunks. */ |
| |
| /* Error of send failed, may used in SCTP_SEND_FAILED event. */ |
| unsigned error; |
| |
| /* These are control chunks we want to send. */ |
| struct sk_buff_head control; |
| |
| /* 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; |
| |
| /* Corked? */ |
| char cork; |
| |
| /* Is this structure empty? */ |
| char empty; |
| |
| /* Are we kfree()able? */ |
| char malloced; |
| }; |
| |
| void sctp_outq_init(struct sctp_association *, struct sctp_outq *); |
| void sctp_outq_teardown(struct sctp_outq *); |
| void sctp_outq_free(struct sctp_outq*); |
| int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); |
| int sctp_outq_flush(struct sctp_outq *, int); |
| int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *); |
| int sctp_outq_is_empty(const struct sctp_outq *); |
| void sctp_outq_restart(struct sctp_outq *); |
| |
| void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, |
| sctp_retransmit_reason_t); |
| void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); |
| int sctp_outq_uncork(struct sctp_outq *); |
| /* Uncork and flush an outqueue. */ |
| static inline void sctp_outq_cork(struct sctp_outq *q) |
| { |
| q->cork = 1; |
| } |
| |
| /* 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; |
| |
| int malloced; /* Are we kfree()able? */ |
| }; |
| |
| 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 sctp_bind_addr *dest, |
| const struct sctp_bind_addr *src, |
| sctp_scope_t scope, int gfp,int flags); |
| int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, |
| int 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 *); |
| 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, int gfp); |
| int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, |
| __u16 port, int gfp); |
| |
| sctp_scope_t sctp_scope(const union sctp_addr *); |
| int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope); |
| int sctp_is_any(const union sctp_addr *addr); |
| int sctp_addr_is_valid(const union sctp_addr *addr); |
| |
| |
| /* What type of endpoint? */ |
| typedef enum { |
| SCTP_EP_TYPE_SOCKET, |
| SCTP_EP_TYPE_ASSOCIATION, |
| } sctp_endpoint_type_t; |
| |
| /* |
| * 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 { |
| /* Fields to help us manage our entries in the hash tables. */ |
| struct sctp_ep_common *next; |
| struct sctp_ep_common **pprev; |
| int hashent; |
| |
| /* Runtime type information. What kind of endpoint is this? */ |
| sctp_endpoint_type_t type; |
| |
| /* Some fields to help us manage this object. |
| * refcnt - Reference count access to this object. |
| * dead - Do not attempt to use this object. |
| * malloced - Do we need to kfree this object? |
| */ |
| atomic_t refcnt; |
| char dead; |
| char malloced; |
| |
| /* What socket does this endpoint belong to? */ |
| struct sock *sk; |
| |
| /* 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; |
| |
| /* Protection during address list comparisons. */ |
| rwlock_t addr_lock; |
| }; |
| |
| |
| /* 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; |
| |
| /* 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_HOW_MANY_SECRETS][SCTP_SECRET_SIZE]; |
| int current_key; |
| int last_key; |
| int key_changed_at; |
| |
| /* Default timeouts. */ |
| int timeouts[SCTP_NUM_TIMEOUT_TYPES]; |
| |
| /* sendbuf acct. policy. */ |
| __u32 sndbuf_policy; |
| }; |
| |
| /* 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 *, int); |
| void sctp_endpoint_free(struct sctp_endpoint *); |
| void sctp_endpoint_put(struct sctp_endpoint *); |
| void sctp_endpoint_hold(struct sctp_endpoint *); |
| 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 **); |
| int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, |
| const union sctp_addr *); |
| struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, |
| const union sctp_addr *); |
| int sctp_has_association(const union sctp_addr *laddr, |
| const union sctp_addr *paddr); |
| |
| int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t, |
| sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, |
| struct sctp_chunk **err_chunk); |
| int sctp_process_init(struct sctp_association *, sctp_cid_t cid, |
| const union sctp_addr *peer, |
| sctp_init_chunk_t *init, int gfp); |
| __u32 sctp_generate_tag(const struct sctp_endpoint *); |
| __u32 sctp_generate_tsn(const struct sctp_endpoint *); |
| |
| |
| /* 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 { |
| /* rwnd |
| * |
| * Peer Rwnd : Current calculated value of the peer's rwnd. |
| */ |
| __u32 rwnd; |
| |
| /* 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; |
| |
| /* 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; |
| __u8 _map[sctp_tsnmap_storage_size(SCTP_TSN_MAP_SIZE)]; |
| |
| /* Ack State : This flag indicates if the next received |
| * : packet is to be responded to with a |
| * : SACK. This is initializedto 0. When a packet |
| * : is received it 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). |
| */ |
| __u8 sack_needed; /* Do we need to sack the peer? */ |
| |
| /* These are capabilities which our peer advertised. */ |
| __u8 ecn_capable; /* Can peer do ECN? */ |
| __u8 ipv4_address; /* Peer understands IPv4 addresses? */ |
| __u8 ipv6_address; /* Peer understands IPv6 addresses? */ |
| __u8 hostname_address;/* Peer understands DNS addresses? */ |
| __u8 asconf_capable; /* Does peer support ADDIP? */ |
| __u8 prsctp_capable; /* Can peer do PR-SCTP? */ |
| |
| __u32 adaption_ind; /* Adaption Code point. */ |
| |
| /* This mask is used to disable sending the ASCONF chunk |
| * with specified parameter to peer. |
| */ |
| __u16 addip_disabled_mask; |
| |
| struct sctp_inithdr i; |
| int cookie_len; |
| void *cookie; |
| |
| /* 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; |
| } 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_*. |
| */ |
| sctp_state_t state; |
| |
| /* The cookie life I award for any cookie. */ |
| struct timeval cookie_life; |
| |
| /* Overall : The overall association error count. |
| * Error Count : [Clear this any time I get something.] |
| */ |
| int overall_error_count; |
| |
| /* 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. |
| */ |
| __u32 rto_initial; |
| __u32 rto_max; |
| __u32 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 initialized from system defaults, but can be |
| * modified by the SCTP_ASSOCINFO socket option. |
| */ |
| int max_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 */ |
| __u16 max_init_timeo; |
| |
| int 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; |
| |
| /* 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; |
| |
| /* The number of unacknowledged data chunks. Reported through |
| * the SCTP_STATUS sockopt. |
| */ |
| __u16 unack_data; |
| |
| /* 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; |
| |
| /* 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 wait queue head for send requests waiting on |
| * the association sndbuf space. |
| */ |
| wait_queue_head_t wait; |
| |
| /* Association : The smallest PMTU discovered for all of the |
| * PMTU : peer's transport addresses. |
| */ |
| __u32 pmtu; |
| |
| /* The message size at which SCTP fragmentation will occur. */ |
| __u32 frag_point; |
| |
| /* 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; |
| |
| /* This tracks outbound ssn for a given stream. */ |
| struct sctp_ssnmap *ssnmap; |
| |
| /* 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; |
| |
| /* Number of seconds of idle time before an association is closed. */ |
| __u32 autoclose; |
| |
| /* 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 4.2 Upon reception of an ASCONF Chunk. |
| * |
| * IMPLEMENTATION NOTE: As an optimization a receiver may wish |
| * to save the last ASCONF-ACK for some predetermined period |
| * of time and instead of re-processing the ASCONF (with the |
| * same serial number) it may just re-transmit the |
| * ASCONF-ACK. It may wish to use the arrival of a new serial |
| * number to discard the previously saved ASCONF-ACK or any |
| * other means it may choose to expire the saved ASCONF-ACK. |
| * |
| * [This is our saved ASCONF-ACK. We invalidate it when a new |
| * ASCONF serial number arrives.] |
| */ |
| struct sctp_chunk *addip_last_asconf_ack; |
| |
| /* 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 sk_buff_head addip_chunks; |
| |
| /* 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; |
| |
| /* Need to send an ECNE Chunk? */ |
| char need_ecne; |
| |
| /* Is it a temporary association? */ |
| char temp; |
| }; |
| |
| |
| /* 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 *, const struct sock *, |
| sctp_scope_t scope, int 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_init_transport( |
| struct sctp_association *); |
| struct sctp_transport *sctp_assoc_choose_shutdown_transport( |
| struct sctp_association *); |
| 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 int 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 *, |
| struct sctp_transport *, |
| sctp_transport_cmd_t, sctp_sn_error_t); |
| struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); |
| struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, |
| const union sctp_addr *, |
| const union sctp_addr *); |
| void sctp_assoc_migrate(struct sctp_association *, struct sock *); |
| void sctp_assoc_update(struct sctp_association *old, |
| struct sctp_association *new); |
| |
| __u32 sctp_association_get_next_tsn(struct sctp_association *); |
| |
| void sctp_assoc_sync_pmtu(struct sctp_association *); |
| void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned); |
| void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned); |
| void sctp_assoc_set_primary(struct sctp_association *, |
| struct sctp_transport *); |
| int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, int); |
| int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, |
| struct sctp_cookie*, int gfp); |
| |
| 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. */ |
| typedef struct sctp_cmsgs { |
| struct sctp_initmsg *init; |
| struct sctp_sndrcvinfo *info; |
| } sctp_cmsgs_t; |
| |
| /* Structure for tracking memory objects */ |
| typedef struct { |
| char *label; |
| atomic_t *counter; |
| } sctp_dbg_objcnt_entry_t; |
| |
| #endif /* __sctp_structs_h__ */ |