^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0-or-later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* SCTP kernel implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * (C) Copyright IBM Corp. 2001, 2004
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (c) 1999-2000 Cisco, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 1999-2001 Motorola, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (c) 2001 Intel Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * This file is part of the SCTP kernel implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Please send any bug reports or fixes you make to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * email addresses:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * lksctp developers <linux-sctp@vger.kernel.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Written or modified by:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * Randall Stewart <randall@sctp.chicago.il.us>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Ken Morneau <kmorneau@cisco.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Qiaobing Xie <qxie1@email.mot.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * La Monte H.P. Yarroll <piggy@acm.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * Karl Knutson <karl@athena.chicago.il.us>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * Jon Grimm <jgrimm@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * Xingang Guo <xingang.guo@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * Hui Huang <hui.huang@nokia.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * Sridhar Samudrala <sri@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * Daisy Chang <daisyc@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * Dajiang Zhang <dajiang.zhang@nokia.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * Ardelle Fan <ardelle.fan@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * Ryan Layer <rmlayer@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * Anup Pemmaiah <pemmaiah@cc.usu.edu>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * Kevin Gao <kevin.gao@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #ifndef __sctp_structs_h__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define __sctp_structs_h__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/ktime.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/generic-radix-tree.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/rhashtable-types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <linux/socket.h> /* linux/in.h needs this!! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <linux/in.h> /* We get struct sockaddr_in. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <linux/in6.h> /* We get struct in6_addr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <linux/ipv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include <asm/param.h> /* We get MAXHOSTNAMELEN. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include <linux/atomic.h> /* This gets us atomic counters. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include <linux/skbuff.h> /* We need sk_buff_head. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include <linux/workqueue.h> /* We need tq_struct. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include <linux/sctp.h> /* We need sctp* header structs. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include <net/sctp/auth.h> /* We need auth specific structs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #include <net/ip.h> /* For inet_skb_parm */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /* A convenience structure for handling sockaddr structures.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * We should wean ourselves off this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) union sctp_addr {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct sockaddr_in v4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) struct sockaddr_in6 v6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) struct sockaddr sa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /* Forward declarations for data structures. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct sctp_globals;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct sctp_endpoint;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct sctp_association;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct sctp_transport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct sctp_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct sctp_chunk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct sctp_inq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct sctp_outq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct sctp_bind_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct sctp_ulpq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct sctp_ep_common;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct crypto_shash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct sctp_stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #include <net/sctp/tsnmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) #include <net/sctp/ulpevent.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) #include <net/sctp/ulpqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) #include <net/sctp/stream_interleave.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /* Structures useful for managing bind/connect. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) struct sctp_bind_bucket {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) unsigned short port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) signed char fastreuse;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) signed char fastreuseport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) kuid_t fastuid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) struct hlist_node node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) struct hlist_head owner;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) struct net *net;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) struct sctp_bind_hashbucket {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct hlist_head chain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /* Used for hashing all associations. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) struct sctp_hashbucket {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) rwlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) struct hlist_head chain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) } __attribute__((__aligned__(8)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /* The SCTP globals structure. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) extern struct sctp_globals {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /* This is a list of groups of functions for each address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * family that we support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct list_head address_families;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) /* This is the hash of all endpoints. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct sctp_hashbucket *ep_hashtable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /* This is the sctp port control hash. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) struct sctp_bind_hashbucket *port_hashtable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /* This is the hash of all transports. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct rhltable transport_hashtable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) /* Sizes of above hashtables. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) int ep_hashsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) int port_hashsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) /* Default initialization values to be applied to new associations. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) __u16 max_instreams;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) __u16 max_outstreams;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) /* Flag to indicate whether computing and verifying checksum
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * is disabled. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) bool checksum_disable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) } sctp_globals;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) #define sctp_max_instreams (sctp_globals.max_instreams)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) #define sctp_max_outstreams (sctp_globals.max_outstreams)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) #define sctp_address_families (sctp_globals.address_families)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) #define sctp_ep_hashsize (sctp_globals.ep_hashsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) #define sctp_ep_hashtable (sctp_globals.ep_hashtable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) #define sctp_port_hashsize (sctp_globals.port_hashsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) #define sctp_port_hashtable (sctp_globals.port_hashtable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) #define sctp_transport_hashtable (sctp_globals.transport_hashtable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) #define sctp_checksum_disable (sctp_globals.checksum_disable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /* SCTP Socket type: UDP or TCP style. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) enum sctp_socket_type {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) SCTP_SOCKET_UDP = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) SCTP_SOCKET_UDP_HIGH_BANDWIDTH,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) SCTP_SOCKET_TCP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) /* Per socket SCTP information. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) struct sctp_sock {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) /* inet_sock has to be the first member of sctp_sock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) struct inet_sock inet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) /* What kind of a socket is this? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) enum sctp_socket_type type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) /* PF_ family specific functions. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) struct sctp_pf *pf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) /* Access to HMAC transform. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) struct crypto_shash *hmac;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) char *sctp_hmac_alg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) /* What is our base endpointer? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) struct sctp_endpoint *ep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) struct sctp_bind_bucket *bind_hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) /* Various Socket Options. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) __u16 default_stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) __u32 default_ppid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) __u16 default_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) __u32 default_context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) __u32 default_timetolive;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) __u32 default_rcv_context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) int max_burst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) * the destination address every heartbeat interval. This value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * will be inherited by all new associations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) __u32 hbinterval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) /* This is the max_retrans value for new associations. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) __u16 pathmaxrxt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) __u32 flowlabel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) __u8 dscp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) __u16 pf_retrans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) __u16 ps_retrans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) /* The initial Path MTU to use for new associations. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) __u32 pathmtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) /* The default SACK delay timeout for new associations. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) __u32 sackdelay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) __u32 sackfreq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) __u32 param_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) __u32 default_ss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) struct sctp_rtoinfo rtoinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) struct sctp_paddrparams paddrparam;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) struct sctp_assocparams assocparams;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * These two structures must be grouped together for the usercopy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) * whitelist region.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) __u16 subscribe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) struct sctp_initmsg initmsg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) int user_frag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) __u32 autoclose;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) __u32 adaptation_ind;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) __u32 pd_point;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) __u16 nodelay:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) pf_expose:2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) reuse:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) disable_fragments:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) v4mapped:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) frag_interleave:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) recvrcvinfo:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) recvnxtinfo:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) data_ready_signalled:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) atomic_t pd_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) /* Fields after this point will be skipped on copies, like on accept
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) * and peeloff operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) /* Receive to here while partial delivery is in effect. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) struct sk_buff_head pd_lobby;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) struct list_head auto_asconf_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) int do_auto_asconf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) static inline struct sctp_sock *sctp_sk(const struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) return (struct sctp_sock *)sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) return (struct sock *)sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) struct sctp6_sock {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) struct sctp_sock sctp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) struct ipv6_pinfo inet6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) #endif /* CONFIG_IPV6 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) /* This is our APPLICATION-SPECIFIC state cookie.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * THIS IS NOT DICTATED BY THE SPECIFICATION.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) /* These are the parts of an association which we send in the cookie.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) * Most of these are straight out of:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) * RFC2960 12.2 Parameters necessary per association (i.e. the TCB)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) struct sctp_cookie {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /* My : Tag expected in every inbound packet and sent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) * Verification: in the INIT or INIT ACK chunk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) * Tag :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) __u32 my_vtag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) /* Peer's : Tag expected in every outbound packet except
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) * Verification: in the INIT chunk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) * Tag :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) __u32 peer_vtag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) /* The rest of these are not from the spec, but really need to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) * be in the cookie.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) /* My Tie Tag : Assist in discovering a restarting association. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) __u32 my_ttag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /* Peer's Tie Tag: Assist in discovering a restarting association. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) __u32 peer_ttag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) /* When does this cookie expire? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) ktime_t expiration;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) /* Number of inbound/outbound streams which are set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * and negotiated during the INIT process.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) __u16 sinit_num_ostreams;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) __u16 sinit_max_instreams;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) /* This is the first sequence number I used. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) __u32 initial_tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) /* This holds the originating address of the INIT packet. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) union sctp_addr peer_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) /* IG Section 2.35.3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) * Include the source port of the INIT-ACK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) __u16 my_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) __u8 prsctp_capable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) /* Padding for future use */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) __u8 padding;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) __u32 adaptation_ind;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) __u8 auth_random[sizeof(struct sctp_paramhdr) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) SCTP_AUTH_RANDOM_LENGTH];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) __u8 auth_chunks[sizeof(struct sctp_paramhdr) + SCTP_AUTH_MAX_CHUNKS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) /* This is a shim for my peer's INIT packet, followed by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) * a copy of the raw address list of the association.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) * The length of the raw address list is saved in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) * raw_addr_list_len field, which will be used at the time when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) * the association TCB is re-constructed from the cookie.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) __u32 raw_addr_list_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) struct sctp_init_chunk peer_init[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) /* The format of our cookie that we send to our peer. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) struct sctp_signed_cookie {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) __u8 signature[SCTP_SECRET_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) __u32 __pad; /* force sctp_cookie alignment to 64 bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) struct sctp_cookie c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) /* This is another convenience type to allocate memory for address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * params for the maximum size and pass such structures around
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * internally.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) union sctp_addr_param {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) struct sctp_paramhdr p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) struct sctp_ipv4addr_param v4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) struct sctp_ipv6addr_param v6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) /* A convenience type to allow walking through the various
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) * parameters and avoid casting all over the place.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) union sctp_params {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) void *v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) struct sctp_paramhdr *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) struct sctp_cookie_preserve_param *life;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) struct sctp_hostname_param *dns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) struct sctp_cookie_param *cookie;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) struct sctp_supported_addrs_param *sat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) struct sctp_ipv4addr_param *v4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) struct sctp_ipv6addr_param *v6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) union sctp_addr_param *addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) struct sctp_adaptation_ind_param *aind;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) struct sctp_supported_ext_param *ext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) struct sctp_random_param *random;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) struct sctp_chunks_param *chunks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) struct sctp_hmac_algo_param *hmac_algo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) struct sctp_addip_param *addip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) /* RFC 2960. Section 3.3.5 Heartbeat.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * Heartbeat Information: variable length
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * The Sender-specific Heartbeat Info field should normally include
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) * information about the sender's current time when this HEARTBEAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) * chunk is sent and the destination transport address to which this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) * HEARTBEAT is sent (see Section 8.3).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) struct sctp_sender_hb_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) struct sctp_paramhdr param_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) union sctp_addr daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) unsigned long sent_at;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) __u64 hb_nonce;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) gfp_t gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) void sctp_stream_free(struct sctp_stream *stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) void sctp_stream_clear(struct sctp_stream *stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) /* What is the current SSN number for this stream? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) #define sctp_ssn_peek(stream, type, sid) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) (sctp_stream_##type((stream), (sid))->ssn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) /* Return the next SSN number for this stream. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) #define sctp_ssn_next(stream, type, sid) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) (sctp_stream_##type((stream), (sid))->ssn++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) /* Skip over this ssn and all below. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) #define sctp_ssn_skip(stream, type, sid, ssn) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) (sctp_stream_##type((stream), (sid))->ssn = ssn + 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) /* What is the current MID number for this stream? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) #define sctp_mid_peek(stream, type, sid) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) (sctp_stream_##type((stream), (sid))->mid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) /* Return the next MID number for this stream. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) #define sctp_mid_next(stream, type, sid) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) (sctp_stream_##type((stream), (sid))->mid++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) /* Skip over this mid and all below. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) #define sctp_mid_skip(stream, type, sid, mid) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) (sctp_stream_##type((stream), (sid))->mid = mid + 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) /* What is the current MID_uo number for this stream? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) #define sctp_mid_uo_peek(stream, type, sid) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) (sctp_stream_##type((stream), (sid))->mid_uo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) /* Return the next MID_uo number for this stream. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) #define sctp_mid_uo_next(stream, type, sid) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) (sctp_stream_##type((stream), (sid))->mid_uo++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) * Pointers to address related SCTP functions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) * (i.e. things that depend on the address family.)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) struct sctp_af {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) int (*sctp_xmit) (struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) struct sctp_transport *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) int (*setsockopt) (struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) int level,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) int optname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) sockptr_t optval,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) unsigned int optlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) int (*getsockopt) (struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) int level,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) int optname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) char __user *optval,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) int __user *optlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) void (*get_dst) (struct sctp_transport *t,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) union sctp_addr *saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) struct flowi *fl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) void (*get_saddr) (struct sctp_sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) struct sctp_transport *t,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) struct flowi *fl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) void (*copy_addrlist) (struct list_head *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) struct net_device *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) int (*cmp_addr) (const union sctp_addr *addr1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) const union sctp_addr *addr2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) void (*addr_copy) (union sctp_addr *dst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) union sctp_addr *src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) void (*from_skb) (union sctp_addr *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) int saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) void (*from_sk) (union sctp_addr *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) bool (*from_addr_param) (union sctp_addr *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) union sctp_addr_param *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) __be16 port, int iif);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) int (*to_addr_param) (const union sctp_addr *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) union sctp_addr_param *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) int (*addr_valid) (union sctp_addr *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) struct sctp_sock *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) const struct sk_buff *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) enum sctp_scope (*scope)(union sctp_addr *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) void (*inaddr_any) (union sctp_addr *, __be16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) int (*is_any) (const union sctp_addr *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) int (*available) (union sctp_addr *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) struct sctp_sock *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) int (*skb_iif) (const struct sk_buff *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) int (*is_ce) (const struct sk_buff *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) void (*seq_dump_addr)(struct seq_file *seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) union sctp_addr *addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) void (*ecn_capable)(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) __u16 net_header_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) int sockaddr_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) int (*ip_options_len)(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) sa_family_t sa_family;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) struct sctp_af *sctp_get_af_specific(sa_family_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) int sctp_register_af(struct sctp_af *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) /* Protocol family functions. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) struct sctp_pf {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) void (*event_msgname)(struct sctp_ulpevent *, char *, int *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) void (*skb_msgname) (struct sk_buff *, char *, int *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) int (*af_supported) (sa_family_t, struct sctp_sock *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) int (*cmp_addr) (const union sctp_addr *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) const union sctp_addr *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) struct sctp_sock *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) int (*bind_verify) (struct sctp_sock *, union sctp_addr *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) int (*send_verify) (struct sctp_sock *, union sctp_addr *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) int (*supported_addrs)(const struct sctp_sock *, __be16 *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) struct sock *(*create_accept_sk) (struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) struct sctp_association *asoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) bool kern);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) void (*to_sk_saddr)(union sctp_addr *, struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) void (*to_sk_daddr)(union sctp_addr *, struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) void (*copy_ip_options)(struct sock *sk, struct sock *newsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) struct sctp_af *af;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) /* Structure to track chunk fragments that have been acked, but peer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) * fragments of the same message have not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) struct sctp_datamsg {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) /* Chunks waiting to be submitted to lower layer. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) struct list_head chunks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) /* Reference counting. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) refcount_t refcnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) /* When is this message no longer interesting to the peer? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) unsigned long expires_at;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) /* Did the messenge fail to send? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) int send_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) u8 send_failed:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) can_delay:1, /* should this message be Nagle delayed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) abandoned:1; /* should this message be abandoned */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) struct sctp_sndrcvinfo *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) struct iov_iter *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) void sctp_datamsg_free(struct sctp_datamsg *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) void sctp_datamsg_put(struct sctp_datamsg *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) void sctp_chunk_fail(struct sctp_chunk *, int error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) int sctp_chunk_abandoned(struct sctp_chunk *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) /* RFC2960 1.4 Key Terms
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) * o Chunk: A unit of information within an SCTP packet, consisting of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) * a chunk header and chunk-specific content.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) * As a matter of convenience, we remember the SCTP common header for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) * each chunk as well as a few other header pointers...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) struct sctp_chunk {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) refcount_t refcnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) /* How many times this chunk have been sent, for prsctp RTX policy */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) int sent_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) /* This is our link to the per-transport transmitted list. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) struct list_head transmitted_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) /* List in specific stream outq */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) struct list_head stream_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) /* This field is used by chunks that hold fragmented data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) * For the first fragment this is the list that holds the rest of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) * fragments. For the remaining fragments, this is the link to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) * frag_list maintained in the first fragment.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) struct list_head frag_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) /* This points to the sk_buff containing the actual data. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) /* In case of GSO packets, this will store the head one */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) struct sk_buff *head_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) /* In case of auth enabled, this will point to the shkey */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) struct sctp_shared_key *shkey;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) /* These are the SCTP headers by reverse order in a packet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) * Note that some of these may happen more than once. In that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) * case, we point at the "current" one, whatever that means
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) * for that level of header.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) /* We point this at the FIRST TLV parameter to chunk_hdr. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) union sctp_params param_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) __u8 *v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) struct sctp_datahdr *data_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) struct sctp_inithdr *init_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) struct sctp_sackhdr *sack_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) struct sctp_heartbeathdr *hb_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) struct sctp_sender_hb_info *hbs_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) struct sctp_shutdownhdr *shutdown_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) struct sctp_signed_cookie *cookie_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) struct sctp_ecnehdr *ecne_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) struct sctp_cwrhdr *ecn_cwr_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) struct sctp_errhdr *err_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) struct sctp_addiphdr *addip_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) struct sctp_fwdtsn_hdr *fwdtsn_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) struct sctp_authhdr *auth_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) struct sctp_idatahdr *idata_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) struct sctp_ifwdtsn_hdr *ifwdtsn_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) } subh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) __u8 *chunk_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) struct sctp_chunkhdr *chunk_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) struct sctphdr *sctp_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) /* This needs to be recoverable for SCTP_SEND_FAILED events. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) struct sctp_sndrcvinfo sinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) /* Which association does this belong to? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) struct sctp_association *asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) /* What endpoint received this chunk? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) struct sctp_ep_common *rcvr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) /* We fill this in if we are calculating RTT. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) unsigned long sent_at;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) /* What is the origin IP address for this chunk? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) union sctp_addr source;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) /* Destination address for this chunk. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) union sctp_addr dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) /* For outbound message, track all fragments for SEND_FAILED. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) struct sctp_datamsg *msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) /* For an inbound chunk, this tells us where it came from.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) * For an outbound chunk, it tells us where we'd like it to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) * go. It is NULL if we have no preference.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) struct sctp_transport *transport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) * we need save a pointer to the AUTH chunk, since the SCTP-AUTH
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) * spec violates the principle premis that all chunks are processed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) * in order.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) struct sk_buff *auth_chunk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) #define SCTP_CAN_FRTX 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) #define SCTP_NEED_FRTX 0x1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) #define SCTP_DONT_FRTX 0x2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) has_tsn:1, /* Does this chunk have a TSN yet? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) has_ssn:1, /* Does this chunk have a SSN yet? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) #define has_mid has_ssn
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) singleton:1, /* Only chunk in the packet? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) end_of_packet:1, /* Last chunk in the packet? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) ecn_ce_done:1, /* Have we processed the ECN CE bit? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) pdiscard:1, /* Discard the whole packet now? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) data_accepted:1, /* At least 1 chunk accepted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) auth:1, /* IN: was auth'ed | OUT: needs auth */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) has_asconf:1, /* IN: have seen an asconf before */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) tsn_missing_report:2, /* Data chunk missing counter. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) fast_retransmit:2; /* Is this chunk fast retransmitted? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) #define sctp_chunk_retransmitted(chunk) (chunk->sent_count > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) void sctp_chunk_hold(struct sctp_chunk *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) void sctp_chunk_put(struct sctp_chunk *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) struct iov_iter *from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) void sctp_chunk_free(struct sctp_chunk *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) struct sctp_chunk *sctp_chunkify(struct sk_buff *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) const struct sctp_association *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) struct sock *, gfp_t gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) union sctp_addr *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) const union sctp_addr *sctp_source(const struct sctp_chunk *chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) static inline __u16 sctp_chunk_stream_no(struct sctp_chunk *ch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) return ntohs(ch->subh.data_hdr->stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) SCTP_ADDR_NEW, /* new address added to assoc/ep */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) SCTP_ADDR_SRC, /* address can be used as source */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) SCTP_ADDR_DEL, /* address about to be deleted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) /* This is a structure for holding either an IPv6 or an IPv4 address. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) struct sctp_sockaddr_entry {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) struct rcu_head rcu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) union sctp_addr a;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) __u8 state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) __u8 valid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) #define SCTP_ADDRESS_TICK_DELAY 500
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) /* This structure holds lists of chunks as we are assembling for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) * transmission.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) struct sctp_packet {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) /* These are the SCTP header values (host order) for the packet. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) __u16 source_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) __u16 destination_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) __u32 vtag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) /* This contains the payload chunks. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) struct list_head chunk_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) /* This is the overhead of the sctp and ip headers. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) size_t overhead;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) /* This is the total size of all chunks INCLUDING padding. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) size_t size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) /* This is the maximum size this packet may have */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) size_t max_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) /* The packet is destined for this transport address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) * The function we finally use to pass down to the next lower
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) * layer lives in the transport structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) struct sctp_transport *transport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) /* pointer to the auth chunk for this packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) struct sctp_chunk *auth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) has_sack:1, /* This packet contains a SACK chunk. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) has_auth:1, /* This packet contains an AUTH chunk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) has_data:1, /* This packet contains at least 1 DATA chunk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) ipfragok:1; /* So let ip fragment this packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) void sctp_packet_init(struct sctp_packet *, struct sctp_transport *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) __u16 sport, __u16 dport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) void sctp_packet_config(struct sctp_packet *, __u32 vtag, int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) enum sctp_xmit sctp_packet_transmit_chunk(struct sctp_packet *packet,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) struct sctp_chunk *chunk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) int one_packet, gfp_t gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) enum sctp_xmit sctp_packet_append_chunk(struct sctp_packet *packet,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) struct sctp_chunk *chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) int sctp_packet_transmit(struct sctp_packet *, gfp_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) void sctp_packet_free(struct sctp_packet *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) static inline int sctp_packet_empty(struct sctp_packet *packet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) return packet->size == packet->overhead;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) /* This represents a remote transport address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) * For local transport addresses, we just use union sctp_addr.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) * RFC2960 Section 1.4 Key Terms
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) * o Transport address: A Transport Address is traditionally defined
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) * by Network Layer address, Transport Layer protocol and Transport
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) * Layer port number. In the case of SCTP running over IP, a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) * transport address is defined by the combination of an IP address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) * and an SCTP port number (where SCTP is the Transport protocol).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) * o The sender keeps a separate congestion control parameter set for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) * each of the destination addresses it can send to (not each
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) * source-destination pair but for each destination). The parameters
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) * should decay if the address is not used for a long enough time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) * period.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) struct sctp_transport {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) /* A list of transports. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) struct list_head transports;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) struct rhlist_head node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) /* Reference counting. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) refcount_t refcnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) /* RTO-Pending : A flag used to track if one of the DATA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) * chunks sent to this address is currently being
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) * used to compute a RTT. If this flag is 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) * the next DATA chunk sent to this destination
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) * should be used to compute a RTT and this flag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) * should be set. Every time the RTT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) * calculation completes (i.e. the DATA chunk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) * is SACK'd) clear this flag.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) __u32 rto_pending:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) * hb_sent : a flag that signals that we have a pending
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) * heartbeat.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) hb_sent:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) /* Is the Path MTU update pending on this tranport */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) pmtu_pending:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) dst_pending_confirm:1, /* need to confirm neighbour */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) /* Has this transport moved the ctsn since we last sacked */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) sack_generation:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) u32 dst_cookie;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) struct flowi fl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) /* This is the peer's IP address and port. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) union sctp_addr ipaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) /* These are the functions we call to handle LLP stuff. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) struct sctp_af *af_specific;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) /* Which association do we belong to? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) struct sctp_association *asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) /* RFC2960
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) * 12.3 Per Transport Address Data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) * For each destination transport address in the peer's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) * address list derived from the INIT or INIT ACK chunk, a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) * number of data elements needs to be maintained including:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) /* RTO : The current retransmission timeout value. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) unsigned long rto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) __u32 rtt; /* This is the most recent RTT. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) /* RTTVAR : The current RTT variation. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) __u32 rttvar;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) /* SRTT : The current smoothed round trip time. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) __u32 srtt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) * These are the congestion stats.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) /* cwnd : The current congestion window. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) __u32 cwnd; /* This is the actual cwnd. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) /* ssthresh : The current slow start threshold value. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) __u32 ssthresh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) /* partial : The tracking method for increase of cwnd when in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) * bytes acked : congestion avoidance mode (see Section 6.2.2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) __u32 partial_bytes_acked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) /* Data that has been sent, but not acknowledged. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) __u32 flight_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) __u32 burst_limited; /* Holds old cwnd when max.burst is applied */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) /* Destination */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) struct dst_entry *dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) /* Source address. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) union sctp_addr saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) * the destination address every heartbeat interval.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) unsigned long hbinterval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) /* SACK delay timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) unsigned long sackdelay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) __u32 sackfreq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) atomic_t mtu_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) /* When was the last time that we heard from this transport? We use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) * this to pick new active and retran paths.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) ktime_t last_time_heard;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) /* When was the last time that we sent a chunk using this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) * transport? We use this to check for idle transports
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) unsigned long last_time_sent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) /* Last time(in jiffies) when cwnd is reduced due to the congestion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) * indication based on ECNE chunk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) unsigned long last_time_ecne_reduced;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) /* This is the max_retrans value for the transport and will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) * be initialized from the assocs value. This can be changed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) * using the SCTP_SET_PEER_ADDR_PARAMS socket option.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) __u16 pathmaxrxt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) __u32 flowlabel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) __u8 dscp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) /* This is the partially failed retrans value for the transport
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) * and will be initialized from the assocs value. This can be changed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) * using the SCTP_PEER_ADDR_THLDS socket option
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) __u16 pf_retrans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) /* Used for primary path switchover. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) __u16 ps_retrans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) /* PMTU : The current known path MTU. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) __u32 pathmtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) __u32 param_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) /* The number of times INIT has been sent on this transport. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) int init_sent_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) /* state : The current state of this destination,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) int state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) /* These are the error stats for this destination. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) /* Error count : The current error count for this destination. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) unsigned short error_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) /* Per : A timer used by each destination.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) * Destination :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) * Timer :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) * [Everywhere else in the text this is called T3-rtx. -ed]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) struct timer_list T3_rtx_timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) /* Heartbeat timer is per destination. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) struct timer_list hb_timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) /* Timer to handle ICMP proto unreachable envets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) struct timer_list proto_unreach_timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) /* Timer to handler reconf chunk rtx */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) struct timer_list reconf_timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) /* Since we're using per-destination retransmission timers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) * (see above), we're also using per-destination "transmitted"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) * queues. This probably ought to be a private struct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) * accessible only within the outqueue, but it's not, yet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) struct list_head transmitted;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) /* We build bundle-able packets for this transport here. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) struct sctp_packet packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) /* This is the list of transports that have chunks to send. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) struct list_head send_ready;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) /* State information saved for SFR_CACC algorithm. The key
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) * idea in SFR_CACC is to maintain state at the sender on a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) * per-destination basis when a changeover happens.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) * char changeover_active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) * char cycling_changeover;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) * __u32 next_tsn_at_change;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) * char cacc_saw_newack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) /* An unsigned integer, which stores the next TSN to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) * used by the sender, at the moment of changeover.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) __u32 next_tsn_at_change;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) /* A flag which indicates the occurrence of a changeover */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) char changeover_active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) /* A flag which indicates whether the change of primary is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) * the first switch to this destination address during an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) * active switch.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) char cycling_changeover;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) /* A temporary flag, which is used during the processing of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) * a SACK to estimate the causative TSN(s)'s group.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) char cacc_saw_newack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) } cacc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) /* 64-bit random number sent with heartbeat. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) __u64 hb_nonce;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) struct rcu_head rcu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) gfp_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) void sctp_transport_set_owner(struct sctp_transport *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) struct sctp_association *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) void sctp_transport_route(struct sctp_transport *, union sctp_addr *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) struct sctp_sock *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) void sctp_transport_free(struct sctp_transport *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) void sctp_transport_reset_t3_rtx(struct sctp_transport *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) void sctp_transport_reset_hb_timer(struct sctp_transport *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) void sctp_transport_reset_reconf_timer(struct sctp_transport *transport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) int sctp_transport_hold(struct sctp_transport *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) void sctp_transport_put(struct sctp_transport *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) void sctp_transport_update_rto(struct sctp_transport *, __u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) void sctp_transport_lower_cwnd(struct sctp_transport *t,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) enum sctp_lower_cwnd reason);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) void sctp_transport_burst_limited(struct sctp_transport *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) void sctp_transport_burst_reset(struct sctp_transport *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) unsigned long sctp_transport_timeout(struct sctp_transport *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) void sctp_transport_reset(struct sctp_transport *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) bool sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) void sctp_transport_immediate_rtx(struct sctp_transport *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) void sctp_transport_dst_release(struct sctp_transport *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) void sctp_transport_dst_confirm(struct sctp_transport *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) /* This is the structure we use to queue packets as they come into
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) * SCTP. We write packets to it and read chunks from it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) struct sctp_inq {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) /* This is actually a queue of sctp_chunk each
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) * containing a partially decoded packet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) struct list_head in_chunk_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) /* This is the packet which is currently off the in queue and is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) * being worked on through the inbound chunk processing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) struct sctp_chunk *in_progress;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) /* This is the delayed task to finish delivering inbound
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) * messages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) struct work_struct immediate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) void sctp_inq_init(struct sctp_inq *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) void sctp_inq_free(struct sctp_inq *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) struct sctp_chunk *sctp_inq_pop(struct sctp_inq *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) /* This is the structure we use to hold outbound chunks. You push
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) * chunks in and they automatically pop out the other end as bundled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) * packets (it calls (*output_handler)()).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) * and 8.2 of the v13 draft.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) * It handles retransmissions. The connection to the timeout portion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) * of the state machine is through sctp_..._timeout() and timeout_handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) * If you feed it SACKs, it will eat them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) * If you give it big chunks, it will fragment them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) * It assigns TSN's to data chunks. This happens at the last possible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) * instant before transmission.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) * When free()'d, it empties itself out via output_handler().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) struct sctp_outq {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) struct sctp_association *asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) /* Data pending that has never been transmitted. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) struct list_head out_chunk_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) /* Stream scheduler being used */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) struct sctp_sched_ops *sched;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) unsigned int out_qlen; /* Total length of queued data chunks. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) /* Error of send failed, may used in SCTP_SEND_FAILED event. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) unsigned int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) /* These are control chunks we want to send. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) struct list_head control_chunk_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) /* These are chunks that have been sacked but are above the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) * CTSN, or cumulative tsn ack point.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) struct list_head sacked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) /* Put chunks on this list to schedule them for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) * retransmission.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) struct list_head retransmit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) /* Put chunks on this list to save them for FWD TSN processing as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) * they were abandoned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) struct list_head abandoned;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) /* How many unackd bytes do we have in-flight? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) __u32 outstanding_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) /* Are we doing fast-rtx on this queue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) char fast_rtx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) /* Corked? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) char cork;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) void sctp_outq_init(struct sctp_association *, struct sctp_outq *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) void sctp_outq_teardown(struct sctp_outq *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) void sctp_outq_free(struct sctp_outq*);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) void sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) int sctp_outq_is_empty(const struct sctp_outq *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) void sctp_outq_restart(struct sctp_outq *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) enum sctp_retransmit_reason reason);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) void sctp_outq_uncork(struct sctp_outq *, gfp_t gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) void sctp_prsctp_prune(struct sctp_association *asoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) struct sctp_sndrcvinfo *sinfo, int msg_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) void sctp_generate_fwdtsn(struct sctp_outq *q, __u32 sack_ctsn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) /* Uncork and flush an outqueue. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) static inline void sctp_outq_cork(struct sctp_outq *q)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) q->cork = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) /* SCTP skb control block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) * sctp_input_cb is currently used on rx and sock rx queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) struct sctp_input_cb {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) struct inet_skb_parm h4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) struct inet6_skb_parm h6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) } header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) struct sctp_chunk *chunk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) struct sctp_af *af;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) #define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) struct sctp_output_cb {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) struct sk_buff *last;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) #define SCTP_OUTPUT_CB(__skb) ((struct sctp_output_cb *)&((__skb)->cb[0]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) return chunk->head_skb ? : skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) /* These bind address data fields common between endpoints and associations */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) struct sctp_bind_addr {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) /* RFC 2960 12.1 Parameters necessary for the SCTP instance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) * SCTP Port: The local SCTP port number the endpoint is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) * bound to.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) __u16 port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) /* RFC 2960 12.1 Parameters necessary for the SCTP instance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) * Address List: The list of IP addresses that this instance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) * has bound. This information is passed to one's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) * peer(s) in INIT and INIT ACK chunks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) struct list_head address_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) void sctp_bind_addr_free(struct sctp_bind_addr *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) const struct sctp_bind_addr *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) enum sctp_scope scope, gfp_t gfp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) int flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) const struct sctp_bind_addr *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) gfp_t gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) int new_size, __u8 addr_state, gfp_t gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) struct sctp_sock *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) struct sctp_sock *, struct sctp_sock *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) const union sctp_addr *addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) int sctp_bind_addrs_check(struct sctp_sock *sp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) struct sctp_sock *sp2, int cnt2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) const union sctp_addr *addrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) int addrcnt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) struct sctp_sock *opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) int *addrs_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) gfp_t gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) __u16 port, gfp_t gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) enum sctp_scope sctp_scope(const union sctp_addr *addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) int sctp_in_scope(struct net *net, const union sctp_addr *addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) const enum sctp_scope scope);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) int sctp_is_any(struct sock *sk, const union sctp_addr *addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) int sctp_is_ep_boundall(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) /* What type of endpoint? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) enum sctp_endpoint_type {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) SCTP_EP_TYPE_SOCKET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) SCTP_EP_TYPE_ASSOCIATION,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) * A common base class to bridge the implmentation view of a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) * socket (usually listening) endpoint versus an association's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) * local endpoint.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) * This common structure is useful for several purposes:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) * 1) Common interface for lookup routines.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) * a) Subfunctions work for either endpoint or association
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) * b) Single interface to lookup allows hiding the lookup lock rather
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) * than acquiring it externally.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) * 2) Common interface for the inbound chunk handling/state machine.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) * 3) Common object handling routines for reference counting, etc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) * 4) Disentangle association lookup from endpoint lookup, where we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) * do not have to find our endpoint to find our association.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) struct sctp_ep_common {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) /* Fields to help us manage our entries in the hash tables. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) struct hlist_node node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) int hashent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) /* Runtime type information. What kind of endpoint is this? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) enum sctp_endpoint_type type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) /* Some fields to help us manage this object.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) * refcnt - Reference count access to this object.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) * dead - Do not attempt to use this object.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) refcount_t refcnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) bool dead;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) /* What socket does this endpoint belong to? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) struct sock *sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) /* Cache netns and it won't change once set */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) struct net *net;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) /* This is where we receive inbound chunks. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) struct sctp_inq inqueue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) /* This substructure includes the defining parameters of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) * endpoint:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) * bind_addr.port is our shared port number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) * bind_addr.address_list is our set of local IP addresses.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) struct sctp_bind_addr bind_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) /* RFC Section 1.4 Key Terms
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) * multi-homed host, an SCTP endpoint is represented to its peers as a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) * combination of a set of eligible destination transport addresses to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) * which SCTP packets can be sent and a set of eligible source
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) * transport addresses from which SCTP packets can be received.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) * All transport addresses used by an SCTP endpoint must use the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) * same port number, but can use multiple IP addresses. A transport
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) * address used by an SCTP endpoint must not be used by another
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) * SCTP endpoint. In other words, a transport address is unique
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) * to an SCTP endpoint.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) * From an implementation perspective, each socket has one of these.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) * A TCP-style socket will have exactly one association on one of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) * these. An UDP-style socket will have multiple associations hanging
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) * off one of these.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) struct sctp_endpoint {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) /* Common substructure for endpoint and association. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) struct sctp_ep_common base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) /* Associations: A list of current associations and mappings
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) * to the data consumers for each association. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) * may be in the form of a hash table or other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) * implementation dependent structure. The data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) * consumers may be process identification
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) * information such as file descriptors, named pipe
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) * pointer, or table pointers dependent on how SCTP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) * is implemented.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) /* This is really a list of struct sctp_association entries. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) struct list_head asocs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) /* Secret Key: A secret key used by this endpoint to compute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) * the MAC. This SHOULD be a cryptographic quality
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) * random number with a sufficient length.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) * Discussion in [RFC1750] can be helpful in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) * selection of the key.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) __u8 secret_key[SCTP_SECRET_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) /* digest: This is a digest of the sctp cookie. This field is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) * only used on the receive path when we try to validate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) * that the cookie has not been tampered with. We put
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) * this here so we pre-allocate this once and can re-use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) * on every receive.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) __u8 *digest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) /* sendbuf acct. policy. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) __u32 sndbuf_policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) /* rcvbuf acct. policy. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) __u32 rcvbuf_policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) /* SCTP AUTH: array of the HMACs that will be allocated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) * we need this per association so that we don't serialize
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) struct crypto_shash **auth_hmacs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) struct sctp_hmac_algo_param *auth_hmacs_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) /* SCTP-AUTH: chunks to authenticate encoded into parameter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) struct sctp_chunks_param *auth_chunk_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) /* SCTP-AUTH: endpoint shared keys */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) struct list_head endpoint_shared_keys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) __u16 active_key_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) __u8 ecn_enable:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) auth_enable:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) intl_enable:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) prsctp_enable:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) asconf_enable:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) reconf_enable:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) __u8 strreset_enable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) /* Security identifiers from incoming (INIT). These are set by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) * security_sctp_assoc_request(). These will only be used by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) * SCTP TCP type sockets and peeled off connections as they
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) * cause a new socket to be generated. security_sctp_sk_clone()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) * will then plug these into the new socket.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) u32 secid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) u32 peer_secid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) struct rcu_head rcu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) /* Recover the outter endpoint structure. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) struct sctp_endpoint *ep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) ep = container_of(base, struct sctp_endpoint, base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) return ep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) /* These are function signatures for manipulating endpoints. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) void sctp_endpoint_free(struct sctp_endpoint *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) void sctp_endpoint_put(struct sctp_endpoint *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) int sctp_endpoint_hold(struct sctp_endpoint *ep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) struct sctp_association *sctp_endpoint_lookup_assoc(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) const struct sctp_endpoint *ep,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) const union sctp_addr *paddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) struct sctp_transport **);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) bool sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) const union sctp_addr *paddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) struct net *, const union sctp_addr *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) bool sctp_has_association(struct net *net, const union sctp_addr *laddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369) const union sctp_addr *paddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) const struct sctp_association *asoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) enum sctp_cid cid, struct sctp_init_chunk *peer_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374) struct sctp_chunk *chunk, struct sctp_chunk **err_chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) const union sctp_addr *peer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) struct sctp_init_chunk *init, gfp_t gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) __u32 sctp_generate_tag(const struct sctp_endpoint *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) __u32 sctp_generate_tsn(const struct sctp_endpoint *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381) struct sctp_inithdr_host {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) __u32 init_tag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) __u32 a_rwnd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384) __u16 num_outbound_streams;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) __u16 num_inbound_streams;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) __u32 initial_tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) struct sctp_stream_priorities {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) /* List of priorities scheduled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) struct list_head prio_sched;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) /* List of streams scheduled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) struct list_head active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) /* The next stream in line */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) struct sctp_stream_out_ext *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) __u16 prio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) struct sctp_stream_out_ext {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) struct list_head outq; /* chunks enqueued by this stream */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) /* Scheduled streams list */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) struct list_head prio_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) struct sctp_stream_priorities *prio_head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) /* Fields used by RR scheduler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) struct list_head rr_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) struct sctp_stream_out {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) __u32 mid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) __u16 ssn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) __u32 mid_uo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) struct sctp_stream_out_ext *ext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) __u8 state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) struct sctp_stream_in {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) __u32 mid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) __u16 ssn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) __u32 mid_uo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432) __u32 fsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) __u32 fsn_uo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) char pd_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) char pd_mode_uo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) struct sctp_stream {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439) GENRADIX(struct sctp_stream_out) out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) GENRADIX(struct sctp_stream_in) in;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442) __u16 outcnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) __u16 incnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) /* Current stream being sent, if any */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) struct sctp_stream_out *out_curr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447) /* Fields used by priority scheduler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449) /* List of priorities scheduled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450) struct list_head prio_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) /* Fields used by RR scheduler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454) /* List of streams scheduled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455) struct list_head rr_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456) /* The next stream in line */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) struct sctp_stream_out_ext *rr_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) struct sctp_stream_interleave *si;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463) static inline struct sctp_stream_out *sctp_stream_out(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464) struct sctp_stream *stream,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465) __u16 sid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467) return genradix_ptr(&stream->out, sid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470) static inline struct sctp_stream_in *sctp_stream_in(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) struct sctp_stream *stream,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472) __u16 sid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) return genradix_ptr(&stream->in, sid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477) #define SCTP_SO(s, i) sctp_stream_out((s), (i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) #define SCTP_SI(s, i) sctp_stream_in((s), (i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480) #define SCTP_STREAM_CLOSED 0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481) #define SCTP_STREAM_OPEN 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483) static inline __u16 sctp_datachk_len(const struct sctp_stream *stream)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) return stream->si->data_chunk_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) static inline __u16 sctp_datahdr_len(const struct sctp_stream *stream)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) return stream->si->data_chunk_len - sizeof(struct sctp_chunkhdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493) static inline __u16 sctp_ftsnchk_len(const struct sctp_stream *stream)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) return stream->si->ftsn_chunk_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498) static inline __u16 sctp_ftsnhdr_len(const struct sctp_stream *stream)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500) return stream->si->ftsn_chunk_len - sizeof(struct sctp_chunkhdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503) /* SCTP_GET_ASSOC_STATS counters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504) struct sctp_priv_assoc_stats {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505) /* Maximum observed rto in the association during subsequent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506) * observations. Value is set to 0 if no RTO measurement took place
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507) * The transport where the max_rto was observed is returned in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508) * obs_rto_ipaddr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) struct sockaddr_storage obs_rto_ipaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) __u64 max_obs_rto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512) /* Total In and Out SACKs received and sent */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513) __u64 isacks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514) __u64 osacks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515) /* Total In and Out packets received and sent */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516) __u64 opackets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517) __u64 ipackets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518) /* Total retransmitted chunks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) __u64 rtxchunks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520) /* TSN received > next expected */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521) __u64 outofseqtsns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522) /* Duplicate Chunks received */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523) __u64 idupchunks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524) /* Gap Ack Blocks received */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) __u64 gapcnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526) /* Unordered data chunks sent and received */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527) __u64 ouodchunks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528) __u64 iuodchunks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529) /* Ordered data chunks sent and received */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) __u64 oodchunks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531) __u64 iodchunks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532) /* Control chunks sent and received */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) __u64 octrlchunks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534) __u64 ictrlchunks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537) /* RFC2960
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539) * 12. Recommended Transmission Control Block (TCB) Parameters
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541) * This section details a recommended set of parameters that should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542) * be contained within the TCB for an implementation. This section is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543) * for illustrative purposes and should not be deemed as requirements
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544) * on an implementation or as an exhaustive list of all parameters
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545) * inside an SCTP TCB. Each implementation may need its own additional
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1546) * parameters for optimization.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1547) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1550) /* Here we have information about each individual association. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1551) struct sctp_association {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1553) /* A base structure common to endpoint and association.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1554) * In this context, it represents the associations's view
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1555) * of the local endpoint of the association.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1556) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1557) struct sctp_ep_common base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1559) /* Associations on the same socket. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1560) struct list_head asocs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1562) /* association id. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1563) sctp_assoc_t assoc_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1565) /* This is our parent endpoint. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1566) struct sctp_endpoint *ep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1568) /* These are those association elements needed in the cookie. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1569) struct sctp_cookie c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1571) /* This is all information about our peer. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1572) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1573) /* transport_addr_list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1574) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1575) * Peer : A list of SCTP transport addresses that the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1576) * Transport : peer is bound to. This information is derived
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1577) * Address : from the INIT or INIT ACK and is used to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1578) * List : associate an inbound packet with a given
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1579) * : association. Normally this information is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1580) * : hashed or keyed for quick lookup and access
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1581) * : of the TCB.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1582) * : The list is also initialized with the list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1583) * : of addresses passed with the sctp_connectx()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1584) * : call.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1585) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1586) * It is a list of SCTP_transport's.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1587) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1588) struct list_head transport_addr_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1589)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1590) /* rwnd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1591) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1592) * Peer Rwnd : Current calculated value of the peer's rwnd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1593) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1594) __u32 rwnd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1596) /* transport_count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1597) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1598) * Peer : A count of the number of peer addresses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1599) * Transport : in the Peer Transport Address List.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1600) * Address :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1601) * Count :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1602) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1603) __u16 transport_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1604)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1605) /* port
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1606) * The transport layer port number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1607) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1608) __u16 port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1610) /* primary_path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1611) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1612) * Primary : This is the current primary destination
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1613) * Path : transport address of the peer endpoint. It
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1614) * : may also specify a source transport address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1615) * : on this endpoint.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1616) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1617) * All of these paths live on transport_addr_list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1618) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1619) * At the bakeoffs, we discovered that the intent of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1620) * primaryPath is that it only changes when the ULP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1621) * asks to have it changed. We add the activePath to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1622) * designate the connection we are currently using to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1623) * transmit new data and most control chunks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1624) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1625) struct sctp_transport *primary_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1626)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1627) /* Cache the primary path address here, when we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1628) * need a an address for msg_name.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1629) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1630) union sctp_addr primary_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1631)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1632) /* active_path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1633) * The path that we are currently using to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1634) * transmit new data and most control chunks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1635) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1636) struct sctp_transport *active_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1638) /* retran_path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1639) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1640) * RFC2960 6.4 Multi-homed SCTP Endpoints
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1641) * ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1642) * Furthermore, when its peer is multi-homed, an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1643) * endpoint SHOULD try to retransmit a chunk to an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1644) * active destination transport address that is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1645) * different from the last destination address to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1646) * which the DATA chunk was sent.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1647) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1648) struct sctp_transport *retran_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1650) /* Pointer to last transport I have sent on. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1651) struct sctp_transport *last_sent_to;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1652)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1653) /* This is the last transport I have received DATA on. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1654) struct sctp_transport *last_data_from;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1656) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1657) * Mapping An array of bits or bytes indicating which out of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1658) * Array order TSN's have been received (relative to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1659) * Last Rcvd TSN). If no gaps exist, i.e. no out of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1660) * order packets have been received, this array
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1661) * will be set to all zero. This structure may be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1662) * in the form of a circular buffer or bit array.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1663) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1664) * Last Rcvd : This is the last TSN received in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1665) * TSN : sequence. This value is set initially by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1666) * : taking the peer's Initial TSN, received in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1667) * : the INIT or INIT ACK chunk, and subtracting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1668) * : one from it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1669) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1670) * Throughout most of the specification this is called the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1671) * "Cumulative TSN ACK Point". In this case, we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1672) * ignore the advice in 12.2 in favour of the term
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1673) * used in the bulk of the text. This value is hidden
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1674) * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1675) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1676) struct sctp_tsnmap tsn_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1678) /* This mask is used to disable sending the ASCONF chunk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1679) * with specified parameter to peer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1680) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1681) __be16 addip_disabled_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1683) /* These are capabilities which our peer advertised. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1684) __u16 ecn_capable:1, /* Can peer do ECN? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1685) ipv4_address:1, /* Peer understands IPv4 addresses? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1686) ipv6_address:1, /* Peer understands IPv6 addresses? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1687) hostname_address:1, /* Peer understands DNS addresses? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1688) asconf_capable:1, /* Does peer support ADDIP? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1689) prsctp_capable:1, /* Can peer do PR-SCTP? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1690) reconf_capable:1, /* Can peer do RE-CONFIG? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1691) intl_capable:1, /* Can peer do INTERLEAVE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1692) auth_capable:1, /* Is peer doing SCTP-AUTH? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1693) /* sack_needed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1694) * This flag indicates if the next received
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1695) * packet is to be responded to with a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1696) * SACK. This is initialized to 0. When a packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1697) * is received sack_cnt is incremented. If this value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1698) * reaches 2 or more, a SACK is sent and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1699) * value is reset to 0. Note: This is used only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1700) * when no DATA chunks are received out of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1701) * order. When DATA chunks are out of order,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1702) * SACK's are not delayed (see Section 6).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1703) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1704) sack_needed:1, /* Do we need to sack the peer? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1705) sack_generation:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1706) zero_window_announced:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1708) __u32 sack_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1709)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1710) __u32 adaptation_ind; /* Adaptation Code point. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1711)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1712) struct sctp_inithdr_host i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1713) void *cookie;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1714) int cookie_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1715)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1716) /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1717) * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1718) * Initial TSN Value minus 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1719) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1720) __u32 addip_serial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1721)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1722) /* SCTP-AUTH: We need to know pears random number, hmac list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1723) * and authenticated chunk list. All that is part of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1724) * cookie and these are just pointers to those locations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1725) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1726) struct sctp_random_param *peer_random;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1727) struct sctp_chunks_param *peer_chunks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1728) struct sctp_hmac_algo_param *peer_hmacs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1729) } peer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1730)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1731) /* State : A state variable indicating what state the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1732) * : association is in, i.e. COOKIE-WAIT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1733) * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1734) * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1735) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1736) * Note: No "CLOSED" state is illustrated since if a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1737) * association is "CLOSED" its TCB SHOULD be removed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1738) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1739) * In this implementation we DO have a CLOSED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1740) * state which is used during initiation and shutdown.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1741) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1742) * State takes values from SCTP_STATE_*.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1743) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1744) enum sctp_state state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1745)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1746) /* Overall : The overall association error count.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1747) * Error Count : [Clear this any time I get something.]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1748) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1749) int overall_error_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1750)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1751) /* The cookie life I award for any cookie. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1752) ktime_t cookie_life;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1753)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1754) /* These are the association's initial, max, and min RTO values.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1755) * These values will be initialized by system defaults, but can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1756) * be modified via the SCTP_RTOINFO socket option.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1757) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1758) unsigned long rto_initial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1759) unsigned long rto_max;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1760) unsigned long rto_min;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1761)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1762) /* Maximum number of new data packets that can be sent in a burst. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1763) int max_burst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1764)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1765) /* This is the max_retrans value for the association. This value will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1766) * be initialized from system defaults, but can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1767) * modified by the SCTP_ASSOCINFO socket option.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1768) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1769) int max_retrans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1770)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1771) /* This is the partially failed retrans value for the transport
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1772) * and will be initialized from the assocs value. This can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1773) * changed using the SCTP_PEER_ADDR_THLDS socket option
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1774) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1775) __u16 pf_retrans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1776) /* Used for primary path switchover. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1777) __u16 ps_retrans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1778)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1779) /* Maximum number of times the endpoint will retransmit INIT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1780) __u16 max_init_attempts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1781)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1782) /* How many times have we resent an INIT? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1783) __u16 init_retries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1784)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1785) /* The largest timeout or RTO value to use in attempting an INIT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1786) unsigned long max_init_timeo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1787)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1788) /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1789) * the destination address every heartbeat interval. This value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1790) * will be inherited by all new transports.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1791) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1792) unsigned long hbinterval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1793)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1794) /* This is the max_retrans value for new transports in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1795) * association.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1796) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1797) __u16 pathmaxrxt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1798)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1799) __u32 flowlabel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1800) __u8 dscp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1801)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1802) /* Flag that path mtu update is pending */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1803) __u8 pmtu_pending;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1804)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1805) /* Association : The smallest PMTU discovered for all of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1806) * PMTU : peer's transport addresses.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1807) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1808) __u32 pathmtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1809)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1810) /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1811) __u32 param_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1812)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1813) __u32 sackfreq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1814) /* SACK delay timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1815) unsigned long sackdelay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1817) unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1818) struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1819)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1820) /* Transport to which SHUTDOWN chunk was last sent. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1821) struct sctp_transport *shutdown_last_sent_to;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1822)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1823) /* Transport to which INIT chunk was last sent. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1824) struct sctp_transport *init_last_sent_to;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1825)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1826) /* How many times have we resent a SHUTDOWN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1827) int shutdown_retries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1828)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1829) /* Next TSN : The next TSN number to be assigned to a new
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1830) * : DATA chunk. This is sent in the INIT or INIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1831) * : ACK chunk to the peer and incremented each
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1832) * : time a DATA chunk is assigned a TSN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1833) * : (normally just prior to transmit or during
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1834) * : fragmentation).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1835) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1836) __u32 next_tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1837)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1838) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1839) * Last Rcvd : This is the last TSN received in sequence. This value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1840) * TSN : is set initially by taking the peer's Initial TSN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1841) * : received in the INIT or INIT ACK chunk, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1842) * : subtracting one from it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1843) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1844) * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1845) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1846)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1847) __u32 ctsn_ack_point;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1848)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1849) /* PR-SCTP Advanced.Peer.Ack.Point */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1850) __u32 adv_peer_ack_point;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1851)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1852) /* Highest TSN that is acknowledged by incoming SACKs. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1853) __u32 highest_sacked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1854)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1855) /* TSN marking the fast recovery exit point */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1856) __u32 fast_recovery_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1857)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1858) /* Flag to track the current fast recovery state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1859) __u8 fast_recovery;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1860)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1861) /* The number of unacknowledged data chunks. Reported through
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1862) * the SCTP_STATUS sockopt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1863) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1864) __u16 unack_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1865)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1866) /* The total number of data chunks that we've had to retransmit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1867) * as the result of a T3 timer expiration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1868) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1869) __u32 rtx_data_chunks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1870)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1871) /* This is the association's receive buffer space. This value is used
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1872) * to set a_rwnd field in an INIT or a SACK chunk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1873) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1874) __u32 rwnd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1875)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1876) /* This is the last advertised value of rwnd over a SACK chunk. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1877) __u32 a_rwnd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1878)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1879) /* Number of bytes by which the rwnd has slopped. The rwnd is allowed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1880) * to slop over a maximum of the association's frag_point.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1881) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1882) __u32 rwnd_over;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1883)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1884) /* Keeps treack of rwnd pressure. This happens when we have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1885) * a window, but not recevie buffer (i.e small packets). This one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1886) * is releases slowly (1 PMTU at a time ).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1887) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1888) __u32 rwnd_press;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1890) /* This is the sndbuf size in use for the association.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1891) * This corresponds to the sndbuf size for the association,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1892) * as specified in the sk->sndbuf.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1893) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1894) int sndbuf_used;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1895)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1896) /* This is the amount of memory that this association has allocated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1897) * in the receive path at any given time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1898) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1899) atomic_t rmem_alloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1900)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1901) /* This is the wait queue head for send requests waiting on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1902) * the association sndbuf space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1903) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1904) wait_queue_head_t wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1905)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1906) /* The message size at which SCTP fragmentation will occur. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1907) __u32 frag_point;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1908) __u32 user_frag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1909)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1910) /* Counter used to count INIT errors. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1911) int init_err_counter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1912)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1913) /* Count the number of INIT cycles (for doubling timeout). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1914) int init_cycle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1915)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1916) /* Default send parameters. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1917) __u16 default_stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1918) __u16 default_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1919) __u32 default_ppid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1920) __u32 default_context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1921) __u32 default_timetolive;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1922)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1923) /* Default receive parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1924) __u32 default_rcv_context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1925)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1926) /* Stream arrays */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1927) struct sctp_stream stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1928)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1929) /* All outbound chunks go through this structure. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1930) struct sctp_outq outqueue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1931)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1932) /* A smart pipe that will handle reordering and fragmentation,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1933) * as well as handle passing events up to the ULP.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1934) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1935) struct sctp_ulpq ulpq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1936)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1937) /* Last TSN that caused an ECNE Chunk to be sent. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1938) __u32 last_ecne_tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1939)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1940) /* Last TSN that caused a CWR Chunk to be sent. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1941) __u32 last_cwr_tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1942)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1943) /* How many duplicated TSNs have we seen? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1944) int numduptsns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1945)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1946) /* These are to support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1947) * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1948) * and Enforcement of Flow and Message Limits"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1949) * <draft-ietf-tsvwg-addip-sctp-02.txt>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1950) * or "ADDIP" for short.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1951) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1952)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1953)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1954)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1955) /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1956) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1957) * R1) One and only one ASCONF Chunk MAY be in transit and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1958) * unacknowledged at any one time. If a sender, after sending
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1959) * an ASCONF chunk, decides it needs to transfer another
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1960) * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1961) * returns from the previous ASCONF Chunk before sending a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1962) * subsequent ASCONF. Note this restriction binds each side,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1963) * so at any time two ASCONF may be in-transit on any given
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1964) * association (one sent from each endpoint).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1965) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1966) * [This is our one-and-only-one ASCONF in flight. If we do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1967) * not have an ASCONF in flight, this is NULL.]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1968) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1969) struct sctp_chunk *addip_last_asconf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1970)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1971) /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1972) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1973) * This is needed to implement itmes E1 - E4 of the updated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1974) * spec. Here is the justification:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1975) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1976) * Since the peer may bundle multiple ASCONF chunks toward us,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1977) * we now need the ability to cache multiple ACKs. The section
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1978) * describes in detail how they are cached and cleaned up.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1979) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1980) struct list_head asconf_ack_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1981)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1982) /* These ASCONF chunks are waiting to be sent.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1983) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1984) * These chunaks can't be pushed to outqueue until receiving
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1985) * ASCONF_ACK for the previous ASCONF indicated by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1986) * addip_last_asconf, so as to guarantee that only one ASCONF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1987) * is in flight at any time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1988) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1989) * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1990) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1991) * In defining the ASCONF Chunk transfer procedures, it is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1992) * essential that these transfers MUST NOT cause congestion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1993) * within the network. To achieve this, we place these
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1994) * restrictions on the transfer of ASCONF Chunks:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1995) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1996) * R1) One and only one ASCONF Chunk MAY be in transit and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1997) * unacknowledged at any one time. If a sender, after sending
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1998) * an ASCONF chunk, decides it needs to transfer another
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1999) * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2000) * returns from the previous ASCONF Chunk before sending a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2001) * subsequent ASCONF. Note this restriction binds each side,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2002) * so at any time two ASCONF may be in-transit on any given
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2003) * association (one sent from each endpoint).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2004) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2005) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2006) * [I really think this is EXACTLY the sort of intelligence
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2007) * which already resides in sctp_outq. Please move this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2008) * queue and its supporting logic down there. --piggy]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2009) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2010) struct list_head addip_chunk_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2011)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2012) /* ADDIP Section 4.1 ASCONF Chunk Procedures
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2013) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2014) * A2) A serial number should be assigned to the Chunk. The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2015) * serial number SHOULD be a monotonically increasing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2016) * number. The serial number SHOULD be initialized at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2017) * the start of the association to the same value as the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2018) * Initial TSN and every time a new ASCONF chunk is created
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2019) * it is incremented by one after assigning the serial number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2020) * to the newly created chunk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2021) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2022) * ADDIP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2023) * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2024) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2025) * Serial Number : 32 bits (unsigned integer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2026) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2027) * This value represents a Serial Number for the ASCONF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2028) * Chunk. The valid range of Serial Number is from 0 to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2029) * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2030) * after reaching 4294967295.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2031) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2032) __u32 addip_serial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2033) int src_out_of_asoc_ok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2034) union sctp_addr *asconf_addr_del_pending;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2035) struct sctp_transport *new_transport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2036)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2037) /* SCTP AUTH: list of the endpoint shared keys. These
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2038) * keys are provided out of band by the user applicaton
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2039) * and can't change during the lifetime of the association
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2040) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2041) struct list_head endpoint_shared_keys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2042)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2043) /* SCTP AUTH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2044) * The current generated assocaition shared key (secret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2045) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2046) struct sctp_auth_bytes *asoc_shared_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2047) struct sctp_shared_key *shkey;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2048)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2049) /* SCTP AUTH: hmac id of the first peer requested algorithm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2050) * that we support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2051) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2052) __u16 default_hmac_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2053)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2054) __u16 active_key_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2055)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2056) __u8 need_ecne:1, /* Need to send an ECNE Chunk? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2057) temp:1, /* Is it a temporary association? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2058) pf_expose:2, /* Expose pf state? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2059) force_delay:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2060)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2061) __u8 strreset_enable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2062) __u8 strreset_outstanding; /* request param count on the fly */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2063)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2064) __u32 strreset_outseq; /* Update after receiving response */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2065) __u32 strreset_inseq; /* Update after receiving request */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2066) __u32 strreset_result[2]; /* save the results of last 2 responses */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2067)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2068) struct sctp_chunk *strreset_chunk; /* save request chunk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2069)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2070) struct sctp_priv_assoc_stats stats;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2071)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2072) int sent_cnt_removable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2073)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2074) __u16 subscribe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2075)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2076) __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2077) __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2078)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2079) struct rcu_head rcu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2080) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2081)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2082)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2083) /* An eyecatcher for determining if we are really looking at an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2084) * association data structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2085) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2086) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2087) SCTP_ASSOC_EYECATCHER = 0xa550c123,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2088) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2089)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2090) /* Recover the outter association structure. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2091) static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2092) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2093) struct sctp_association *asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2094)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2095) asoc = container_of(base, struct sctp_association, base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2096) return asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2097) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2098)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2099) /* These are function signatures for manipulating associations. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2102) struct sctp_association *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2103) sctp_association_new(const struct sctp_endpoint *ep, const struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2104) enum sctp_scope scope, gfp_t gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2105) void sctp_association_free(struct sctp_association *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2106) void sctp_association_put(struct sctp_association *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2107) void sctp_association_hold(struct sctp_association *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2109) struct sctp_transport *sctp_assoc_choose_alter_transport(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2110) struct sctp_association *, struct sctp_transport *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2111) void sctp_assoc_update_retran_path(struct sctp_association *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2112) struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2113) const union sctp_addr *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2114) int sctp_assoc_lookup_laddr(struct sctp_association *asoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2115) const union sctp_addr *laddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2116) struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2117) const union sctp_addr *address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2118) const gfp_t gfp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2119) const int peer_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2120) void sctp_assoc_del_peer(struct sctp_association *asoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2121) const union sctp_addr *addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2122) void sctp_assoc_rm_peer(struct sctp_association *asoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2123) struct sctp_transport *peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2124) void sctp_assoc_control_transport(struct sctp_association *asoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2125) struct sctp_transport *transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2126) enum sctp_transport_cmd command,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2127) sctp_sn_error_t error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2128) struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2129) void sctp_assoc_migrate(struct sctp_association *, struct sock *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2130) int sctp_assoc_update(struct sctp_association *old,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2131) struct sctp_association *new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2133) __u32 sctp_association_get_next_tsn(struct sctp_association *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2135) void sctp_assoc_update_frag_point(struct sctp_association *asoc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2136) void sctp_assoc_set_pmtu(struct sctp_association *asoc, __u32 pmtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2137) void sctp_assoc_sync_pmtu(struct sctp_association *asoc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2138) void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2139) void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2140) void sctp_assoc_set_primary(struct sctp_association *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2141) struct sctp_transport *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2142) void sctp_assoc_del_nonprimary_peers(struct sctp_association *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2143) struct sctp_transport *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2144) int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2145) enum sctp_scope scope, gfp_t gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2146) int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2147) struct sctp_cookie*,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2148) gfp_t gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2149) int sctp_assoc_set_id(struct sctp_association *, gfp_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2150) void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2151) struct sctp_chunk *sctp_assoc_lookup_asconf_ack(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2152) const struct sctp_association *asoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2153) __be32 serial);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2154) void sctp_asconf_queue_teardown(struct sctp_association *asoc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2156) int sctp_cmp_addr_exact(const union sctp_addr *ss1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2157) const union sctp_addr *ss2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2158) struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2160) /* A convenience structure to parse out SCTP specific CMSGs. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2161) struct sctp_cmsgs {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2162) struct sctp_initmsg *init;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2163) struct sctp_sndrcvinfo *srinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2164) struct sctp_sndinfo *sinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2165) struct sctp_prinfo *prinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2166) struct sctp_authinfo *authinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2167) struct msghdr *addrs_msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2168) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2170) /* Structure for tracking memory objects */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2171) struct sctp_dbg_objcnt_entry {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2172) char *label;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2173) atomic_t *counter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2174) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2176) #endif /* __sctp_structs_h__ */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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