mirror of https://gitee.com/openkylin/linux.git
2184 lines
67 KiB
C
2184 lines
67 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* SCTP kernel implementation
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* (C) Copyright IBM Corp. 2001, 2004
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* Copyright (c) 1999-2000 Cisco, Inc.
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* Copyright (c) 1999-2001 Motorola, Inc.
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* Copyright (c) 2001 Intel Corp.
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*
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* This file is part of the SCTP kernel implementation
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*
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* Please send any bug reports or fixes you make to the
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* email addresses:
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* lksctp developers <linux-sctp@vger.kernel.org>
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*
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* Written or modified by:
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* Randall Stewart <randall@sctp.chicago.il.us>
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* Ken Morneau <kmorneau@cisco.com>
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* Qiaobing Xie <qxie1@email.mot.com>
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* La Monte H.P. Yarroll <piggy@acm.org>
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* Karl Knutson <karl@athena.chicago.il.us>
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* Jon Grimm <jgrimm@us.ibm.com>
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* Xingang Guo <xingang.guo@intel.com>
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* Hui Huang <hui.huang@nokia.com>
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* Sridhar Samudrala <sri@us.ibm.com>
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* Daisy Chang <daisyc@us.ibm.com>
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* Dajiang Zhang <dajiang.zhang@nokia.com>
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* Ardelle Fan <ardelle.fan@intel.com>
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* Ryan Layer <rmlayer@us.ibm.com>
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* Anup Pemmaiah <pemmaiah@cc.usu.edu>
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* Kevin Gao <kevin.gao@intel.com>
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*/
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#ifndef __sctp_structs_h__
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#define __sctp_structs_h__
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#include <linux/ktime.h>
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#include <linux/generic-radix-tree.h>
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#include <linux/rhashtable-types.h>
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#include <linux/socket.h> /* linux/in.h needs this!! */
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#include <linux/in.h> /* We get struct sockaddr_in. */
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#include <linux/in6.h> /* We get struct in6_addr */
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#include <linux/ipv6.h>
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#include <asm/param.h> /* We get MAXHOSTNAMELEN. */
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#include <linux/atomic.h> /* This gets us atomic counters. */
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#include <linux/skbuff.h> /* We need sk_buff_head. */
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#include <linux/workqueue.h> /* We need tq_struct. */
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#include <linux/sctp.h> /* We need sctp* header structs. */
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#include <net/sctp/auth.h> /* We need auth specific structs */
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#include <net/ip.h> /* For inet_skb_parm */
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/* A convenience structure for handling sockaddr structures.
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* We should wean ourselves off this.
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*/
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union sctp_addr {
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struct sockaddr_in v4;
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struct sockaddr_in6 v6;
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struct sockaddr sa;
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};
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/* Forward declarations for data structures. */
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struct sctp_globals;
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struct sctp_endpoint;
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struct sctp_association;
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struct sctp_transport;
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struct sctp_packet;
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struct sctp_chunk;
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struct sctp_inq;
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struct sctp_outq;
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struct sctp_bind_addr;
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struct sctp_ulpq;
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struct sctp_ep_common;
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struct crypto_shash;
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struct sctp_stream;
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#include <net/sctp/tsnmap.h>
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#include <net/sctp/ulpevent.h>
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#include <net/sctp/ulpqueue.h>
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#include <net/sctp/stream_interleave.h>
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/* Structures useful for managing bind/connect. */
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struct sctp_bind_bucket {
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unsigned short port;
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signed char fastreuse;
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signed char fastreuseport;
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kuid_t fastuid;
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struct hlist_node node;
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struct hlist_head owner;
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struct net *net;
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};
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struct sctp_bind_hashbucket {
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spinlock_t lock;
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struct hlist_head chain;
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};
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/* Used for hashing all associations. */
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struct sctp_hashbucket {
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rwlock_t lock;
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struct hlist_head chain;
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} __attribute__((__aligned__(8)));
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/* The SCTP globals structure. */
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extern struct sctp_globals {
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/* This is a list of groups of functions for each address
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* family that we support.
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*/
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struct list_head address_families;
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/* This is the hash of all endpoints. */
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struct sctp_hashbucket *ep_hashtable;
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/* This is the sctp port control hash. */
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struct sctp_bind_hashbucket *port_hashtable;
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/* This is the hash of all transports. */
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struct rhltable transport_hashtable;
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/* Sizes of above hashtables. */
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int ep_hashsize;
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int port_hashsize;
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/* Default initialization values to be applied to new associations. */
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__u16 max_instreams;
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__u16 max_outstreams;
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/* Flag to indicate whether computing and verifying checksum
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* is disabled. */
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bool checksum_disable;
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} sctp_globals;
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#define sctp_max_instreams (sctp_globals.max_instreams)
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#define sctp_max_outstreams (sctp_globals.max_outstreams)
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#define sctp_address_families (sctp_globals.address_families)
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#define sctp_ep_hashsize (sctp_globals.ep_hashsize)
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#define sctp_ep_hashtable (sctp_globals.ep_hashtable)
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#define sctp_port_hashsize (sctp_globals.port_hashsize)
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#define sctp_port_hashtable (sctp_globals.port_hashtable)
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#define sctp_transport_hashtable (sctp_globals.transport_hashtable)
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#define sctp_checksum_disable (sctp_globals.checksum_disable)
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/* SCTP Socket type: UDP or TCP style. */
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enum sctp_socket_type {
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SCTP_SOCKET_UDP = 0,
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SCTP_SOCKET_UDP_HIGH_BANDWIDTH,
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SCTP_SOCKET_TCP
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};
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/* Per socket SCTP information. */
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struct sctp_sock {
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/* inet_sock has to be the first member of sctp_sock */
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struct inet_sock inet;
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/* What kind of a socket is this? */
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enum sctp_socket_type type;
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/* PF_ family specific functions. */
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struct sctp_pf *pf;
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/* Access to HMAC transform. */
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struct crypto_shash *hmac;
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char *sctp_hmac_alg;
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/* What is our base endpointer? */
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struct sctp_endpoint *ep;
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struct sctp_bind_bucket *bind_hash;
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/* Various Socket Options. */
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__u16 default_stream;
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__u32 default_ppid;
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__u16 default_flags;
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__u32 default_context;
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__u32 default_timetolive;
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__u32 default_rcv_context;
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int max_burst;
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/* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
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* the destination address every heartbeat interval. This value
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* will be inherited by all new associations.
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*/
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__u32 hbinterval;
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/* This is the max_retrans value for new associations. */
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__u16 pathmaxrxt;
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__u32 flowlabel;
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__u8 dscp;
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__u16 pf_retrans;
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__u16 ps_retrans;
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/* The initial Path MTU to use for new associations. */
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__u32 pathmtu;
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/* The default SACK delay timeout for new associations. */
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__u32 sackdelay;
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__u32 sackfreq;
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/* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
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__u32 param_flags;
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__u32 default_ss;
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struct sctp_rtoinfo rtoinfo;
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struct sctp_paddrparams paddrparam;
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struct sctp_assocparams assocparams;
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/*
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* These two structures must be grouped together for the usercopy
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* whitelist region.
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*/
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__u16 subscribe;
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struct sctp_initmsg initmsg;
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int user_frag;
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__u32 autoclose;
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__u32 adaptation_ind;
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__u32 pd_point;
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__u16 nodelay:1,
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pf_expose:2,
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reuse:1,
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disable_fragments:1,
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v4mapped:1,
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frag_interleave:1,
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recvrcvinfo:1,
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recvnxtinfo:1,
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data_ready_signalled:1;
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atomic_t pd_mode;
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/* Receive to here while partial delivery is in effect. */
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struct sk_buff_head pd_lobby;
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/* These must be the last fields, as they will skipped on copies,
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* like on accept and peeloff operations
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*/
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struct list_head auto_asconf_list;
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int do_auto_asconf;
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};
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static inline struct sctp_sock *sctp_sk(const struct sock *sk)
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{
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return (struct sctp_sock *)sk;
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}
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static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp)
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{
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return (struct sock *)sp;
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}
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#if IS_ENABLED(CONFIG_IPV6)
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struct sctp6_sock {
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struct sctp_sock sctp;
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struct ipv6_pinfo inet6;
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};
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#endif /* CONFIG_IPV6 */
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/* This is our APPLICATION-SPECIFIC state cookie.
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* THIS IS NOT DICTATED BY THE SPECIFICATION.
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*/
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/* These are the parts of an association which we send in the cookie.
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* Most of these are straight out of:
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* RFC2960 12.2 Parameters necessary per association (i.e. the TCB)
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*
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*/
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struct sctp_cookie {
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/* My : Tag expected in every inbound packet and sent
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* Verification: in the INIT or INIT ACK chunk.
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* Tag :
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*/
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__u32 my_vtag;
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/* Peer's : Tag expected in every outbound packet except
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* Verification: in the INIT chunk.
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* Tag :
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*/
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__u32 peer_vtag;
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/* The rest of these are not from the spec, but really need to
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* be in the cookie.
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*/
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/* My Tie Tag : Assist in discovering a restarting association. */
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__u32 my_ttag;
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/* Peer's Tie Tag: Assist in discovering a restarting association. */
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__u32 peer_ttag;
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/* When does this cookie expire? */
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ktime_t expiration;
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/* Number of inbound/outbound streams which are set
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* and negotiated during the INIT process.
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*/
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__u16 sinit_num_ostreams;
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__u16 sinit_max_instreams;
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/* This is the first sequence number I used. */
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__u32 initial_tsn;
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/* This holds the originating address of the INIT packet. */
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union sctp_addr peer_addr;
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/* IG Section 2.35.3
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* Include the source port of the INIT-ACK
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*/
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__u16 my_port;
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__u8 prsctp_capable;
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/* Padding for future use */
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__u8 padding;
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__u32 adaptation_ind;
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__u8 auth_random[sizeof(struct sctp_paramhdr) +
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SCTP_AUTH_RANDOM_LENGTH];
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__u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2];
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__u8 auth_chunks[sizeof(struct sctp_paramhdr) + SCTP_AUTH_MAX_CHUNKS];
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/* This is a shim for my peer's INIT packet, followed by
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* a copy of the raw address list of the association.
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* The length of the raw address list is saved in the
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* raw_addr_list_len field, which will be used at the time when
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* the association TCB is re-constructed from the cookie.
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*/
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__u32 raw_addr_list_len;
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struct sctp_init_chunk peer_init[0];
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};
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/* The format of our cookie that we send to our peer. */
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struct sctp_signed_cookie {
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__u8 signature[SCTP_SECRET_SIZE];
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__u32 __pad; /* force sctp_cookie alignment to 64 bits */
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struct sctp_cookie c;
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} __packed;
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/* This is another convenience type to allocate memory for address
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* params for the maximum size and pass such structures around
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* internally.
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*/
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union sctp_addr_param {
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struct sctp_paramhdr p;
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struct sctp_ipv4addr_param v4;
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struct sctp_ipv6addr_param v6;
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};
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/* A convenience type to allow walking through the various
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* parameters and avoid casting all over the place.
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*/
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union sctp_params {
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void *v;
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struct sctp_paramhdr *p;
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struct sctp_cookie_preserve_param *life;
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struct sctp_hostname_param *dns;
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struct sctp_cookie_param *cookie;
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struct sctp_supported_addrs_param *sat;
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struct sctp_ipv4addr_param *v4;
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struct sctp_ipv6addr_param *v6;
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union sctp_addr_param *addr;
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struct sctp_adaptation_ind_param *aind;
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struct sctp_supported_ext_param *ext;
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struct sctp_random_param *random;
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struct sctp_chunks_param *chunks;
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struct sctp_hmac_algo_param *hmac_algo;
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struct sctp_addip_param *addip;
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};
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/* RFC 2960. Section 3.3.5 Heartbeat.
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* Heartbeat Information: variable length
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* The Sender-specific Heartbeat Info field should normally include
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* information about the sender's current time when this HEARTBEAT
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* chunk is sent and the destination transport address to which this
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* HEARTBEAT is sent (see Section 8.3).
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*/
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struct sctp_sender_hb_info {
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struct sctp_paramhdr param_hdr;
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union sctp_addr daddr;
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unsigned long sent_at;
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__u64 hb_nonce;
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};
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int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
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gfp_t gfp);
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int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid);
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void sctp_stream_free(struct sctp_stream *stream);
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void sctp_stream_clear(struct sctp_stream *stream);
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void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new);
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/* What is the current SSN number for this stream? */
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#define sctp_ssn_peek(stream, type, sid) \
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(sctp_stream_##type((stream), (sid))->ssn)
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/* Return the next SSN number for this stream. */
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#define sctp_ssn_next(stream, type, sid) \
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(sctp_stream_##type((stream), (sid))->ssn++)
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/* Skip over this ssn and all below. */
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#define sctp_ssn_skip(stream, type, sid, ssn) \
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(sctp_stream_##type((stream), (sid))->ssn = ssn + 1)
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/* What is the current MID number for this stream? */
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#define sctp_mid_peek(stream, type, sid) \
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(sctp_stream_##type((stream), (sid))->mid)
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/* Return the next MID number for this stream. */
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#define sctp_mid_next(stream, type, sid) \
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(sctp_stream_##type((stream), (sid))->mid++)
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/* Skip over this mid and all below. */
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#define sctp_mid_skip(stream, type, sid, mid) \
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(sctp_stream_##type((stream), (sid))->mid = mid + 1)
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/* What is the current MID_uo number for this stream? */
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#define sctp_mid_uo_peek(stream, type, sid) \
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(sctp_stream_##type((stream), (sid))->mid_uo)
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/* Return the next MID_uo number for this stream. */
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#define sctp_mid_uo_next(stream, type, sid) \
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(sctp_stream_##type((stream), (sid))->mid_uo++)
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/*
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* Pointers to address related SCTP functions.
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* (i.e. things that depend on the address family.)
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*/
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struct sctp_af {
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int (*sctp_xmit) (struct sk_buff *skb,
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struct sctp_transport *);
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int (*setsockopt) (struct sock *sk,
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int level,
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int optname,
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char __user *optval,
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unsigned int optlen);
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int (*getsockopt) (struct sock *sk,
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int level,
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int optname,
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char __user *optval,
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int __user *optlen);
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int (*compat_setsockopt) (struct sock *sk,
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int level,
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int optname,
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char __user *optval,
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unsigned int optlen);
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int (*compat_getsockopt) (struct sock *sk,
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int level,
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int optname,
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char __user *optval,
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int __user *optlen);
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void (*get_dst) (struct sctp_transport *t,
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union sctp_addr *saddr,
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struct flowi *fl,
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struct sock *sk);
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void (*get_saddr) (struct sctp_sock *sk,
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struct sctp_transport *t,
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struct flowi *fl);
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void (*copy_addrlist) (struct list_head *,
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struct net_device *);
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int (*cmp_addr) (const union sctp_addr *addr1,
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const union sctp_addr *addr2);
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void (*addr_copy) (union sctp_addr *dst,
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union sctp_addr *src);
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void (*from_skb) (union sctp_addr *,
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struct sk_buff *skb,
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int saddr);
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void (*from_sk) (union sctp_addr *,
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struct sock *sk);
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void (*from_addr_param) (union sctp_addr *,
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union sctp_addr_param *,
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__be16 port, int iif);
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int (*to_addr_param) (const union sctp_addr *,
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union sctp_addr_param *);
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int (*addr_valid) (union sctp_addr *,
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struct sctp_sock *,
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const struct sk_buff *);
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enum sctp_scope (*scope)(union sctp_addr *);
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void (*inaddr_any) (union sctp_addr *, __be16);
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int (*is_any) (const union sctp_addr *);
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int (*available) (union sctp_addr *,
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struct sctp_sock *);
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int (*skb_iif) (const struct sk_buff *sk);
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int (*is_ce) (const struct sk_buff *sk);
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void (*seq_dump_addr)(struct seq_file *seq,
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union sctp_addr *addr);
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void (*ecn_capable)(struct sock *sk);
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__u16 net_header_len;
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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 */
|
|
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;
|
|
|
|
/* 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;
|
|
|
|
/* 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;
|
|
|
|
/* 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;
|
|
|
|
/* 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);
|
|
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);
|
|
|
|
|
|
/* 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;
|
|
};
|
|
#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 {
|
|
/* Fields to help us manage our entries in the hash tables. */
|
|
struct hlist_node node;
|
|
int hashent;
|
|
|
|
/* 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;
|
|
|
|
/* 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;
|
|
|
|
/* 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;
|
|
};
|
|
|
|
/* 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 *);
|
|
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 **);
|
|
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 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 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 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;
|
|
|
|
/* 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.
|
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*
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* This is needed to implement itmes E1 - E4 of the updated
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* spec. Here is the justification:
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*
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* Since the peer may bundle multiple ASCONF chunks toward us,
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* we now need the ability to cache multiple ACKs. The section
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* describes in detail how they are cached and cleaned up.
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*/
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struct list_head asconf_ack_list;
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/* These ASCONF chunks are waiting to be sent.
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*
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* These chunaks can't be pushed to outqueue until receiving
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* ASCONF_ACK for the previous ASCONF indicated by
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* addip_last_asconf, so as to guarantee that only one ASCONF
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* is in flight at any time.
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*
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* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
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*
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* In defining the ASCONF Chunk transfer procedures, it is
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* essential that these transfers MUST NOT cause congestion
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* within the network. To achieve this, we place these
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* restrictions on the transfer of ASCONF Chunks:
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*
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* R1) One and only one ASCONF Chunk MAY be in transit and
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* unacknowledged at any one time. If a sender, after sending
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* an ASCONF chunk, decides it needs to transfer another
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* ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
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* returns from the previous ASCONF Chunk before sending a
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* subsequent ASCONF. Note this restriction binds each side,
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* so at any time two ASCONF may be in-transit on any given
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* association (one sent from each endpoint).
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*
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*
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* [I really think this is EXACTLY the sort of intelligence
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* which already resides in sctp_outq. Please move this
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* queue and its supporting logic down there. --piggy]
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*/
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struct list_head addip_chunk_list;
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/* ADDIP Section 4.1 ASCONF Chunk Procedures
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*
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* A2) A serial number should be assigned to the Chunk. The
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* serial number SHOULD be a monotonically increasing
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* number. The serial number SHOULD be initialized at
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* the start of the association to the same value as the
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* Initial TSN and every time a new ASCONF chunk is created
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* it is incremented by one after assigning the serial number
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* to the newly created chunk.
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*
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* ADDIP
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* 3.1.1 Address/Stream Configuration Change Chunk (ASCONF)
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*
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* Serial Number : 32 bits (unsigned integer)
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*
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* This value represents a Serial Number for the ASCONF
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* Chunk. The valid range of Serial Number is from 0 to
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* 4294967295 (2^32 - 1). Serial Numbers wrap back to 0
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* after reaching 4294967295.
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*/
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__u32 addip_serial;
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int src_out_of_asoc_ok;
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union sctp_addr *asconf_addr_del_pending;
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struct sctp_transport *new_transport;
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/* SCTP AUTH: list of the endpoint shared keys. These
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* keys are provided out of band by the user applicaton
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* and can't change during the lifetime of the association
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*/
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struct list_head endpoint_shared_keys;
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/* SCTP AUTH:
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* The current generated assocaition shared key (secret)
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*/
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struct sctp_auth_bytes *asoc_shared_key;
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struct sctp_shared_key *shkey;
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/* SCTP AUTH: hmac id of the first peer requested algorithm
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* that we support.
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*/
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__u16 default_hmac_id;
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__u16 active_key_id;
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__u8 need_ecne:1, /* Need to send an ECNE Chunk? */
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temp:1, /* Is it a temporary association? */
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pf_expose:2, /* Expose pf state? */
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force_delay:1;
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__u8 strreset_enable;
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__u8 strreset_outstanding; /* request param count on the fly */
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|
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__u32 strreset_outseq; /* Update after receiving response */
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__u32 strreset_inseq; /* Update after receiving request */
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__u32 strreset_result[2]; /* save the results of last 2 responses */
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struct sctp_chunk *strreset_chunk; /* save request chunk */
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|
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struct sctp_priv_assoc_stats stats;
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|
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int sent_cnt_removable;
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|
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__u16 subscribe;
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|
|
__u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1];
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|
__u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1];
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|
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struct rcu_head rcu;
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};
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|
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/* An eyecatcher for determining if we are really looking at an
|
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* association data structure.
|
|
*/
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|
enum {
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SCTP_ASSOC_EYECATCHER = 0xa550c123,
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};
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|
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/* Recover the outter association structure. */
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static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base)
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|
{
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struct sctp_association *asoc;
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|
|
|
asoc = container_of(base, struct sctp_association, base);
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|
return asoc;
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|
}
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|
|
/* These are function signatures for manipulating associations. */
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|
|
|
|
struct sctp_association *
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|
sctp_association_new(const struct sctp_endpoint *ep, const struct sock *sk,
|
|
enum sctp_scope scope, gfp_t gfp);
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|
void sctp_association_free(struct sctp_association *);
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|
void sctp_association_put(struct sctp_association *);
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|
void sctp_association_hold(struct sctp_association *);
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|
|
|
struct sctp_transport *sctp_assoc_choose_alter_transport(
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|
struct sctp_association *, struct sctp_transport *);
|
|
void sctp_assoc_update_retran_path(struct sctp_association *);
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|
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 *);
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|
|
|
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__ */
|