Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 1 | /* SCTP kernel implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * (C) Copyright IBM Corp. 2001, 2004 |
| 3 | * Copyright (c) 1999-2000 Cisco, Inc. |
| 4 | * Copyright (c) 1999-2001 Motorola, Inc. |
| 5 | * Copyright (c) 2001 Intel Corp. |
| 6 | * |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 7 | * This file is part of the SCTP kernel implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 9 | * This SCTP implementation is free software; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * you can redistribute it and/or modify it under the terms of |
| 11 | * the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2, or (at your option) |
| 13 | * any later version. |
| 14 | * |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 15 | * This SCTP implementation is distributed in the hope that it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| 17 | * ************************ |
| 18 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 19 | * See the GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
Jeff Kirsher | 4b2f13a | 2013-12-06 06:28:48 -0800 | [diff] [blame] | 22 | * along with GNU CC; see the file COPYING. If not, see |
| 23 | * <http://www.gnu.org/licenses/>. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | * |
| 25 | * Please send any bug reports or fixes you make to the |
| 26 | * email addresses: |
Daniel Borkmann | 91705c6 | 2013-07-23 14:51:47 +0200 | [diff] [blame] | 27 | * lksctp developers <linux-sctp@vger.kernel.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | * Written or modified by: |
| 30 | * Randall Stewart <randall@sctp.chicago.il.us> |
| 31 | * Ken Morneau <kmorneau@cisco.com> |
| 32 | * Qiaobing Xie <qxie1@email.mot.com> |
| 33 | * La Monte H.P. Yarroll <piggy@acm.org> |
| 34 | * Karl Knutson <karl@athena.chicago.il.us> |
| 35 | * Jon Grimm <jgrimm@us.ibm.com> |
| 36 | * Xingang Guo <xingang.guo@intel.com> |
| 37 | * Hui Huang <hui.huang@nokia.com> |
| 38 | * Sridhar Samudrala <sri@us.ibm.com> |
| 39 | * Daisy Chang <daisyc@us.ibm.com> |
| 40 | * Dajiang Zhang <dajiang.zhang@nokia.com> |
| 41 | * Ardelle Fan <ardelle.fan@intel.com> |
| 42 | * Ryan Layer <rmlayer@us.ibm.com> |
| 43 | * Anup Pemmaiah <pemmaiah@cc.usu.edu> |
| 44 | * Kevin Gao <kevin.gao@intel.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | */ |
| 46 | |
| 47 | #ifndef __sctp_structs_h__ |
| 48 | #define __sctp_structs_h__ |
| 49 | |
Daniel Borkmann | 52db882 | 2013-06-25 18:17:27 +0200 | [diff] [blame] | 50 | #include <linux/ktime.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <linux/socket.h> /* linux/in.h needs this!! */ |
| 52 | #include <linux/in.h> /* We get struct sockaddr_in. */ |
| 53 | #include <linux/in6.h> /* We get struct in6_addr */ |
| 54 | #include <linux/ipv6.h> |
| 55 | #include <asm/param.h> /* We get MAXHOSTNAMELEN. */ |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 56 | #include <linux/atomic.h> /* This gets us atomic counters. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | #include <linux/skbuff.h> /* We need sk_buff_head. */ |
| 58 | #include <linux/workqueue.h> /* We need tq_struct. */ |
| 59 | #include <linux/sctp.h> /* We need sctp* header structs. */ |
Vlad Yasevich | 1f48564 | 2007-10-09 01:15:59 -0700 | [diff] [blame] | 60 | #include <net/sctp/auth.h> /* We need auth specific structs */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
| 62 | /* A convenience structure for handling sockaddr structures. |
| 63 | * We should wean ourselves off this. |
| 64 | */ |
| 65 | union sctp_addr { |
| 66 | struct sockaddr_in v4; |
| 67 | struct sockaddr_in6 v6; |
| 68 | struct sockaddr sa; |
| 69 | }; |
| 70 | |
| 71 | /* Forward declarations for data structures. */ |
| 72 | struct sctp_globals; |
| 73 | struct sctp_endpoint; |
| 74 | struct sctp_association; |
| 75 | struct sctp_transport; |
| 76 | struct sctp_packet; |
| 77 | struct sctp_chunk; |
| 78 | struct sctp_inq; |
| 79 | struct sctp_outq; |
| 80 | struct sctp_bind_addr; |
| 81 | struct sctp_ulpq; |
| 82 | struct sctp_ep_common; |
| 83 | struct sctp_ssnmap; |
Herbert Xu | 1b489e1 | 2006-08-20 15:07:14 +1000 | [diff] [blame] | 84 | struct crypto_hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
| 86 | |
| 87 | #include <net/sctp/tsnmap.h> |
| 88 | #include <net/sctp/ulpevent.h> |
| 89 | #include <net/sctp/ulpqueue.h> |
| 90 | |
| 91 | /* Structures useful for managing bind/connect. */ |
| 92 | |
| 93 | struct sctp_bind_bucket { |
| 94 | unsigned short port; |
| 95 | unsigned short fastreuse; |
Vlad Yasevich | d970dbf | 2007-11-09 11:43:40 -0500 | [diff] [blame] | 96 | struct hlist_node node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | struct hlist_head owner; |
Eric W. Biederman | f1f4376 | 2012-08-06 08:39:38 +0000 | [diff] [blame] | 98 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | }; |
| 100 | |
| 101 | struct sctp_bind_hashbucket { |
| 102 | spinlock_t lock; |
Vlad Yasevich | d970dbf | 2007-11-09 11:43:40 -0500 | [diff] [blame] | 103 | struct hlist_head chain; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | }; |
| 105 | |
| 106 | /* Used for hashing all associations. */ |
| 107 | struct sctp_hashbucket { |
| 108 | rwlock_t lock; |
Vlad Yasevich | d970dbf | 2007-11-09 11:43:40 -0500 | [diff] [blame] | 109 | struct hlist_head chain; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | } __attribute__((__aligned__(8))); |
| 111 | |
| 112 | |
| 113 | /* The SCTP globals structure. */ |
| 114 | extern struct sctp_globals { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | /* This is a list of groups of functions for each address |
| 116 | * family that we support. |
| 117 | */ |
| 118 | struct list_head address_families; |
| 119 | |
| 120 | /* This is the hash of all endpoints. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | struct sctp_hashbucket *ep_hashtable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | /* This is the hash of all associations. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | struct sctp_hashbucket *assoc_hashtable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | /* This is the sctp port control hash. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | struct sctp_bind_hashbucket *port_hashtable; |
David S. Miller | 71acc0d | 2013-08-09 13:09:41 -0700 | [diff] [blame] | 126 | |
Daniel Borkmann | 76bfd89 | 2013-08-26 16:34:00 +0200 | [diff] [blame] | 127 | /* Sizes of above hashtables. */ |
| 128 | int ep_hashsize; |
| 129 | int assoc_hashsize; |
| 130 | int port_hashsize; |
| 131 | |
| 132 | /* Default initialization values to be applied to new associations. */ |
| 133 | __u16 max_instreams; |
| 134 | __u16 max_outstreams; |
| 135 | |
David S. Miller | 71acc0d | 2013-08-09 13:09:41 -0700 | [diff] [blame] | 136 | /* Flag to indicate whether computing and verifying checksum |
| 137 | * is disabled. */ |
| 138 | bool checksum_disable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | } sctp_globals; |
| 140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | #define sctp_max_instreams (sctp_globals.max_instreams) |
| 142 | #define sctp_max_outstreams (sctp_globals.max_outstreams) |
| 143 | #define sctp_address_families (sctp_globals.address_families) |
| 144 | #define sctp_ep_hashsize (sctp_globals.ep_hashsize) |
| 145 | #define sctp_ep_hashtable (sctp_globals.ep_hashtable) |
| 146 | #define sctp_assoc_hashsize (sctp_globals.assoc_hashsize) |
| 147 | #define sctp_assoc_hashtable (sctp_globals.assoc_hashtable) |
| 148 | #define sctp_port_hashsize (sctp_globals.port_hashsize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | #define sctp_port_hashtable (sctp_globals.port_hashtable) |
David S. Miller | 71acc0d | 2013-08-09 13:09:41 -0700 | [diff] [blame] | 150 | #define sctp_checksum_disable (sctp_globals.checksum_disable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
| 152 | /* SCTP Socket type: UDP or TCP style. */ |
| 153 | typedef enum { |
| 154 | SCTP_SOCKET_UDP = 0, |
| 155 | SCTP_SOCKET_UDP_HIGH_BANDWIDTH, |
| 156 | SCTP_SOCKET_TCP |
| 157 | } sctp_socket_type_t; |
| 158 | |
| 159 | /* Per socket SCTP information. */ |
| 160 | struct sctp_sock { |
| 161 | /* inet_sock has to be the first member of sctp_sock */ |
| 162 | struct inet_sock inet; |
| 163 | /* What kind of a socket is this? */ |
| 164 | sctp_socket_type_t type; |
| 165 | |
| 166 | /* PF_ family specific functions. */ |
| 167 | struct sctp_pf *pf; |
| 168 | |
| 169 | /* Access to HMAC transform. */ |
Herbert Xu | 1b489e1 | 2006-08-20 15:07:14 +1000 | [diff] [blame] | 170 | struct crypto_hash *hmac; |
Neil Horman | 3c68198 | 2012-10-24 09:20:03 +0000 | [diff] [blame] | 171 | char *sctp_hmac_alg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
| 173 | /* What is our base endpointer? */ |
| 174 | struct sctp_endpoint *ep; |
| 175 | |
| 176 | struct sctp_bind_bucket *bind_hash; |
| 177 | /* Various Socket Options. */ |
| 178 | __u16 default_stream; |
| 179 | __u32 default_ppid; |
| 180 | __u16 default_flags; |
| 181 | __u32 default_context; |
| 182 | __u32 default_timetolive; |
Ivan Skytte Jorgensen | 6ab792f | 2006-12-13 16:34:22 -0800 | [diff] [blame] | 183 | __u32 default_rcv_context; |
Vlad Yasevich | 7033157 | 2007-03-23 11:34:36 -0700 | [diff] [blame] | 184 | int max_burst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 186 | /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
| 187 | * the destination address every heartbeat interval. This value |
| 188 | * will be inherited by all new associations. |
| 189 | */ |
| 190 | __u32 hbinterval; |
| 191 | |
| 192 | /* This is the max_retrans value for new associations. */ |
| 193 | __u16 pathmaxrxt; |
| 194 | |
| 195 | /* The initial Path MTU to use for new associations. */ |
| 196 | __u32 pathmtu; |
| 197 | |
| 198 | /* The default SACK delay timeout for new associations. */ |
| 199 | __u32 sackdelay; |
Wei Yongjun | d364d92 | 2008-05-09 15:13:26 -0700 | [diff] [blame] | 200 | __u32 sackfreq; |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 201 | |
Joe Perches | f4ab2f72 | 2007-12-20 13:56:32 -0800 | [diff] [blame] | 202 | /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 203 | __u32 param_flags; |
| 204 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | struct sctp_initmsg initmsg; |
| 206 | struct sctp_rtoinfo rtoinfo; |
| 207 | struct sctp_paddrparams paddrparam; |
| 208 | struct sctp_event_subscribe subscribe; |
| 209 | struct sctp_assocparams assocparams; |
Geir Ola Vaagland | 0d3a421 | 2014-07-12 20:30:37 +0200 | [diff] [blame] | 210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | int user_frag; |
Geir Ola Vaagland | 0d3a421 | 2014-07-12 20:30:37 +0200 | [diff] [blame] | 212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | __u32 autoclose; |
| 214 | __u8 nodelay; |
| 215 | __u8 disable_fragments; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | __u8 v4mapped; |
Vlad Yasevich | b6e1331 | 2007-04-20 12:23:15 -0700 | [diff] [blame] | 217 | __u8 frag_interleave; |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 218 | __u32 adaptation_ind; |
Vlad Yasevich | d49d91d | 2007-03-23 11:32:00 -0700 | [diff] [blame] | 219 | __u32 pd_point; |
Geir Ola Vaagland | 0d3a421 | 2014-07-12 20:30:37 +0200 | [diff] [blame] | 220 | __u8 recvrcvinfo; |
Geir Ola Vaagland | 2347c80 | 2014-07-12 20:30:38 +0200 | [diff] [blame] | 221 | __u8 recvnxtinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
Vlad Yasevich | b6e1331 | 2007-04-20 12:23:15 -0700 | [diff] [blame] | 223 | atomic_t pd_mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | /* Receive to here while partial delivery is in effect. */ |
| 225 | struct sk_buff_head pd_lobby; |
Marcelo Ricardo Leitner | 2d45a02 | 2015-06-12 10:16:41 -0300 | [diff] [blame] | 226 | |
| 227 | /* These must be the last fields, as they will skipped on copies, |
| 228 | * like on accept and peeloff operations |
| 229 | */ |
Michio Honda | 9f7d653 | 2011-04-26 19:32:51 +0900 | [diff] [blame] | 230 | struct list_head auto_asconf_list; |
| 231 | int do_auto_asconf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | }; |
| 233 | |
| 234 | static inline struct sctp_sock *sctp_sk(const struct sock *sk) |
| 235 | { |
| 236 | return (struct sctp_sock *)sk; |
| 237 | } |
| 238 | |
| 239 | static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) |
| 240 | { |
| 241 | return (struct sock *)sp; |
| 242 | } |
| 243 | |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 244 | #if IS_ENABLED(CONFIG_IPV6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | struct sctp6_sock { |
| 246 | struct sctp_sock sctp; |
| 247 | struct ipv6_pinfo inet6; |
| 248 | }; |
| 249 | #endif /* CONFIG_IPV6 */ |
| 250 | |
| 251 | |
| 252 | /* This is our APPLICATION-SPECIFIC state cookie. |
| 253 | * THIS IS NOT DICTATED BY THE SPECIFICATION. |
| 254 | */ |
| 255 | /* These are the parts of an association which we send in the cookie. |
| 256 | * Most of these are straight out of: |
| 257 | * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) |
| 258 | * |
| 259 | */ |
| 260 | |
| 261 | struct sctp_cookie { |
| 262 | |
| 263 | /* My : Tag expected in every inbound packet and sent |
| 264 | * Verification: in the INIT or INIT ACK chunk. |
| 265 | * Tag : |
| 266 | */ |
| 267 | __u32 my_vtag; |
| 268 | |
| 269 | /* Peer's : Tag expected in every outbound packet except |
| 270 | * Verification: in the INIT chunk. |
| 271 | * Tag : |
| 272 | */ |
| 273 | __u32 peer_vtag; |
| 274 | |
| 275 | /* The rest of these are not from the spec, but really need to |
| 276 | * be in the cookie. |
| 277 | */ |
| 278 | |
| 279 | /* My Tie Tag : Assist in discovering a restarting association. */ |
| 280 | __u32 my_ttag; |
| 281 | |
| 282 | /* Peer's Tie Tag: Assist in discovering a restarting association. */ |
| 283 | __u32 peer_ttag; |
| 284 | |
| 285 | /* When does this cookie expire? */ |
Daniel Borkmann | 52db882 | 2013-06-25 18:17:27 +0200 | [diff] [blame] | 286 | ktime_t expiration; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | |
| 288 | /* Number of inbound/outbound streams which are set |
| 289 | * and negotiated during the INIT process. |
| 290 | */ |
| 291 | __u16 sinit_num_ostreams; |
| 292 | __u16 sinit_max_instreams; |
| 293 | |
| 294 | /* This is the first sequence number I used. */ |
| 295 | __u32 initial_tsn; |
| 296 | |
| 297 | /* This holds the originating address of the INIT packet. */ |
| 298 | union sctp_addr peer_addr; |
| 299 | |
| 300 | /* IG Section 2.35.3 |
| 301 | * Include the source port of the INIT-ACK |
| 302 | */ |
| 303 | __u16 my_port; |
| 304 | |
| 305 | __u8 prsctp_capable; |
| 306 | |
| 307 | /* Padding for future use */ |
| 308 | __u8 padding; |
| 309 | |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 310 | __u32 adaptation_ind; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | |
Vlad Yasevich | 1f48564 | 2007-10-09 01:15:59 -0700 | [diff] [blame] | 312 | __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH]; |
Wei Yongjun | 028dba0 | 2011-03-31 23:38:54 +0000 | [diff] [blame] | 313 | __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2]; |
Vlad Yasevich | 1f48564 | 2007-10-09 01:15:59 -0700 | [diff] [blame] | 314 | __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | |
| 316 | /* This is a shim for my peer's INIT packet, followed by |
| 317 | * a copy of the raw address list of the association. |
| 318 | * The length of the raw address list is saved in the |
| 319 | * raw_addr_list_len field, which will be used at the time when |
| 320 | * the association TCB is re-constructed from the cookie. |
| 321 | */ |
| 322 | __u32 raw_addr_list_len; |
| 323 | struct sctp_init_chunk peer_init[0]; |
| 324 | }; |
| 325 | |
| 326 | |
| 327 | /* The format of our cookie that we send to our peer. */ |
| 328 | struct sctp_signed_cookie { |
| 329 | __u8 signature[SCTP_SECRET_SIZE]; |
Vlad Yasevich | 9834a2b | 2006-01-17 11:52:12 -0800 | [diff] [blame] | 330 | __u32 __pad; /* force sctp_cookie alignment to 64 bits */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | struct sctp_cookie c; |
Eric Dumazet | bc10502 | 2010-06-03 03:21:52 -0700 | [diff] [blame] | 332 | } __packed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
| 334 | /* This is another convenience type to allocate memory for address |
| 335 | * params for the maximum size and pass such structures around |
| 336 | * internally. |
| 337 | */ |
| 338 | union sctp_addr_param { |
Wei Yongjun | 6f4c618 | 2007-09-19 17:19:52 +0800 | [diff] [blame] | 339 | struct sctp_paramhdr p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | struct sctp_ipv4addr_param v4; |
| 341 | struct sctp_ipv6addr_param v6; |
| 342 | }; |
| 343 | |
| 344 | /* A convenience type to allow walking through the various |
| 345 | * parameters and avoid casting all over the place. |
| 346 | */ |
| 347 | union sctp_params { |
| 348 | void *v; |
| 349 | struct sctp_paramhdr *p; |
| 350 | struct sctp_cookie_preserve_param *life; |
| 351 | struct sctp_hostname_param *dns; |
| 352 | struct sctp_cookie_param *cookie; |
| 353 | struct sctp_supported_addrs_param *sat; |
| 354 | struct sctp_ipv4addr_param *v4; |
| 355 | struct sctp_ipv6addr_param *v6; |
| 356 | union sctp_addr_param *addr; |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 357 | struct sctp_adaptation_ind_param *aind; |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 358 | struct sctp_supported_ext_param *ext; |
Vlad Yasevich | 1f48564 | 2007-10-09 01:15:59 -0700 | [diff] [blame] | 359 | struct sctp_random_param *random; |
| 360 | struct sctp_chunks_param *chunks; |
| 361 | struct sctp_hmac_algo_param *hmac_algo; |
Vlad Yasevich | d6de309 | 2007-12-20 14:10:00 -0800 | [diff] [blame] | 362 | struct sctp_addip_param *addip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | }; |
| 364 | |
| 365 | /* RFC 2960. Section 3.3.5 Heartbeat. |
| 366 | * Heartbeat Information: variable length |
| 367 | * The Sender-specific Heartbeat Info field should normally include |
| 368 | * information about the sender's current time when this HEARTBEAT |
| 369 | * chunk is sent and the destination transport address to which this |
| 370 | * HEARTBEAT is sent (see Section 8.3). |
| 371 | */ |
| 372 | typedef struct sctp_sender_hb_info { |
| 373 | struct sctp_paramhdr param_hdr; |
| 374 | union sctp_addr daddr; |
| 375 | unsigned long sent_at; |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 376 | __u64 hb_nonce; |
Eric Dumazet | bc10502 | 2010-06-03 03:21:52 -0700 | [diff] [blame] | 377 | } __packed sctp_sender_hb_info_t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
| 379 | /* |
| 380 | * RFC 2960 1.3.2 Sequenced Delivery within Streams |
| 381 | * |
| 382 | * The term "stream" is used in SCTP to refer to a sequence of user |
| 383 | * messages that are to be delivered to the upper-layer protocol in |
| 384 | * order with respect to other messages within the same stream. This is |
| 385 | * in contrast to its usage in TCP, where it refers to a sequence of |
| 386 | * bytes (in this document a byte is assumed to be eight bits). |
| 387 | * ... |
| 388 | * |
| 389 | * This is the structure we use to track both our outbound and inbound |
| 390 | * SSN, or Stream Sequence Numbers. |
| 391 | */ |
| 392 | |
| 393 | struct sctp_stream { |
| 394 | __u16 *ssn; |
| 395 | unsigned int len; |
| 396 | }; |
| 397 | |
| 398 | struct sctp_ssnmap { |
| 399 | struct sctp_stream in; |
| 400 | struct sctp_stream out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | }; |
| 402 | |
Alexey Dobriyan | 3182cd8 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 403 | struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 404 | gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | void sctp_ssnmap_free(struct sctp_ssnmap *map); |
| 406 | void sctp_ssnmap_clear(struct sctp_ssnmap *map); |
| 407 | |
| 408 | /* What is the current SSN number for this stream? */ |
| 409 | static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) |
| 410 | { |
| 411 | return stream->ssn[id]; |
| 412 | } |
| 413 | |
| 414 | /* Return the next SSN number for this stream. */ |
| 415 | static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) |
| 416 | { |
| 417 | return stream->ssn[id]++; |
| 418 | } |
| 419 | |
| 420 | /* Skip over this ssn and all below. */ |
| 421 | static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, |
| 422 | __u16 ssn) |
| 423 | { |
| 424 | stream->ssn[id] = ssn+1; |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | * Pointers to address related SCTP functions. |
| 429 | * (i.e. things that depend on the address family.) |
| 430 | */ |
| 431 | struct sctp_af { |
| 432 | int (*sctp_xmit) (struct sk_buff *skb, |
Herbert Xu | f880374 | 2008-08-03 21:15:08 -0700 | [diff] [blame] | 433 | struct sctp_transport *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | int (*setsockopt) (struct sock *sk, |
| 435 | int level, |
| 436 | int optname, |
| 437 | char __user *optval, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 438 | unsigned int optlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | int (*getsockopt) (struct sock *sk, |
| 440 | int level, |
| 441 | int optname, |
| 442 | char __user *optval, |
| 443 | int __user *optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 444 | int (*compat_setsockopt) (struct sock *sk, |
| 445 | int level, |
| 446 | int optname, |
| 447 | char __user *optval, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 448 | unsigned int optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 449 | int (*compat_getsockopt) (struct sock *sk, |
| 450 | int level, |
| 451 | int optname, |
| 452 | char __user *optval, |
| 453 | int __user *optlen); |
Vlad Yasevich | da0420b | 2011-04-26 21:54:17 +0000 | [diff] [blame] | 454 | void (*get_dst) (struct sctp_transport *t, |
Vlad Yasevich | 9914ae3 | 2011-04-26 21:51:31 +0000 | [diff] [blame] | 455 | union sctp_addr *saddr, |
| 456 | struct flowi *fl, |
| 457 | struct sock *sk); |
YOSHIFUJI Hideaki | e511710 | 2008-05-29 19:55:05 +0900 | [diff] [blame] | 458 | void (*get_saddr) (struct sctp_sock *sk, |
Vlad Yasevich | 9914ae3 | 2011-04-26 21:51:31 +0000 | [diff] [blame] | 459 | struct sctp_transport *t, |
Vlad Yasevich | 9914ae3 | 2011-04-26 21:51:31 +0000 | [diff] [blame] | 460 | struct flowi *fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | void (*copy_addrlist) (struct list_head *, |
| 462 | struct net_device *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | int (*cmp_addr) (const union sctp_addr *addr1, |
| 464 | const union sctp_addr *addr2); |
| 465 | void (*addr_copy) (union sctp_addr *dst, |
| 466 | union sctp_addr *src); |
| 467 | void (*from_skb) (union sctp_addr *, |
| 468 | struct sk_buff *skb, |
| 469 | int saddr); |
| 470 | void (*from_sk) (union sctp_addr *, |
| 471 | struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | void (*from_addr_param) (union sctp_addr *, |
| 473 | union sctp_addr_param *, |
Al Viro | dd86d13 | 2006-11-20 17:11:13 -0800 | [diff] [blame] | 474 | __be16 port, int iif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | int (*to_addr_param) (const union sctp_addr *, |
| 476 | union sctp_addr_param *); |
| 477 | int (*addr_valid) (union sctp_addr *, |
Vlad Yasevich | 5636bef | 2006-06-17 22:55:35 -0700 | [diff] [blame] | 478 | struct sctp_sock *, |
| 479 | const struct sk_buff *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | sctp_scope_t (*scope) (union sctp_addr *); |
Al Viro | 6fbfa9f | 2006-11-20 17:24:53 -0800 | [diff] [blame] | 481 | void (*inaddr_any) (union sctp_addr *, __be16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | int (*is_any) (const union sctp_addr *); |
| 483 | int (*available) (union sctp_addr *, |
| 484 | struct sctp_sock *); |
| 485 | int (*skb_iif) (const struct sk_buff *sk); |
| 486 | int (*is_ce) (const struct sk_buff *sk); |
| 487 | void (*seq_dump_addr)(struct seq_file *seq, |
| 488 | union sctp_addr *addr); |
Vlad Yasevich | b9031d9 | 2008-06-04 12:40:15 -0700 | [diff] [blame] | 489 | void (*ecn_capable)(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | __u16 net_header_len; |
| 491 | int sockaddr_len; |
| 492 | sa_family_t sa_family; |
| 493 | struct list_head list; |
| 494 | }; |
| 495 | |
| 496 | struct sctp_af *sctp_get_af_specific(sa_family_t); |
| 497 | int sctp_register_af(struct sctp_af *); |
| 498 | |
| 499 | /* Protocol family functions. */ |
| 500 | struct sctp_pf { |
| 501 | void (*event_msgname)(struct sctp_ulpevent *, char *, int *); |
| 502 | void (*skb_msgname) (struct sk_buff *, char *, int *); |
| 503 | int (*af_supported) (sa_family_t, struct sctp_sock *); |
| 504 | int (*cmp_addr) (const union sctp_addr *, |
| 505 | const union sctp_addr *, |
| 506 | struct sctp_sock *); |
| 507 | int (*bind_verify) (struct sctp_sock *, union sctp_addr *); |
| 508 | int (*send_verify) (struct sctp_sock *, union sctp_addr *); |
Al Viro | 3dbe865 | 2006-11-20 17:25:49 -0800 | [diff] [blame] | 509 | int (*supported_addrs)(const struct sctp_sock *, __be16 *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | struct sock *(*create_accept_sk) (struct sock *sk, |
| 511 | struct sctp_association *asoc); |
Jason Gunthorpe | 299ee12 | 2014-07-30 12:40:53 -0600 | [diff] [blame] | 512 | int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); |
| 513 | void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); |
| 514 | void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | struct sctp_af *af; |
| 516 | }; |
| 517 | |
| 518 | |
| 519 | /* Structure to track chunk fragments that have been acked, but peer |
| 520 | * fragments of the same message have not. |
| 521 | */ |
| 522 | struct sctp_datamsg { |
| 523 | /* Chunks waiting to be submitted to lower layer. */ |
| 524 | struct list_head chunks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | /* Reference counting. */ |
| 526 | atomic_t refcnt; |
| 527 | /* When is this message no longer interesting to the peer? */ |
| 528 | unsigned long expires_at; |
| 529 | /* Did the messenge fail to send? */ |
| 530 | int send_error; |
Vlad Yasevich | 0e3aef8 | 2010-04-30 22:41:10 -0400 | [diff] [blame] | 531 | u8 send_failed:1, |
| 532 | can_abandon:1, /* can chunks from this message can be abandoned. */ |
| 533 | can_delay; /* should this message be Nagle delayed */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | }; |
| 535 | |
| 536 | struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, |
| 537 | struct sctp_sndrcvinfo *, |
Al Viro | e0eb093 | 2014-11-15 01:11:23 -0500 | [diff] [blame] | 538 | struct iov_iter *); |
Vlad Yasevich | 9c5c62b | 2009-08-10 13:51:03 -0400 | [diff] [blame] | 539 | void sctp_datamsg_free(struct sctp_datamsg *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | void sctp_datamsg_put(struct sctp_datamsg *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | void sctp_chunk_fail(struct sctp_chunk *, int error); |
| 542 | int sctp_chunk_abandoned(struct sctp_chunk *); |
| 543 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | /* RFC2960 1.4 Key Terms |
| 545 | * |
| 546 | * o Chunk: A unit of information within an SCTP packet, consisting of |
| 547 | * a chunk header and chunk-specific content. |
| 548 | * |
| 549 | * As a matter of convenience, we remember the SCTP common header for |
| 550 | * each chunk as well as a few other header pointers... |
| 551 | */ |
| 552 | struct sctp_chunk { |
David S. Miller | 79af02c | 2005-07-08 21:47:49 -0700 | [diff] [blame] | 553 | struct list_head list; |
| 554 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | atomic_t refcnt; |
| 556 | |
| 557 | /* This is our link to the per-transport transmitted list. */ |
| 558 | struct list_head transmitted_list; |
| 559 | |
| 560 | /* This field is used by chunks that hold fragmented data. |
| 561 | * For the first fragment this is the list that holds the rest of |
| 562 | * fragments. For the remaining fragments, this is the link to the |
| 563 | * frag_list maintained in the first fragment. |
| 564 | */ |
| 565 | struct list_head frag_list; |
| 566 | |
| 567 | /* This points to the sk_buff containing the actual data. */ |
| 568 | struct sk_buff *skb; |
| 569 | |
| 570 | /* These are the SCTP headers by reverse order in a packet. |
| 571 | * Note that some of these may happen more than once. In that |
| 572 | * case, we point at the "current" one, whatever that means |
| 573 | * for that level of header. |
| 574 | */ |
| 575 | |
| 576 | /* We point this at the FIRST TLV parameter to chunk_hdr. */ |
| 577 | union sctp_params param_hdr; |
| 578 | union { |
| 579 | __u8 *v; |
| 580 | struct sctp_datahdr *data_hdr; |
| 581 | struct sctp_inithdr *init_hdr; |
| 582 | struct sctp_sackhdr *sack_hdr; |
| 583 | struct sctp_heartbeathdr *hb_hdr; |
| 584 | struct sctp_sender_hb_info *hbs_hdr; |
| 585 | struct sctp_shutdownhdr *shutdown_hdr; |
| 586 | struct sctp_signed_cookie *cookie_hdr; |
| 587 | struct sctp_ecnehdr *ecne_hdr; |
| 588 | struct sctp_cwrhdr *ecn_cwr_hdr; |
| 589 | struct sctp_errhdr *err_hdr; |
| 590 | struct sctp_addiphdr *addip_hdr; |
| 591 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
Vlad Yasevich | 1f48564 | 2007-10-09 01:15:59 -0700 | [diff] [blame] | 592 | struct sctp_authhdr *auth_hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | } subh; |
| 594 | |
| 595 | __u8 *chunk_end; |
| 596 | |
| 597 | struct sctp_chunkhdr *chunk_hdr; |
| 598 | struct sctphdr *sctp_hdr; |
| 599 | |
| 600 | /* This needs to be recoverable for SCTP_SEND_FAILED events. */ |
| 601 | struct sctp_sndrcvinfo sinfo; |
| 602 | |
| 603 | /* Which association does this belong to? */ |
| 604 | struct sctp_association *asoc; |
| 605 | |
| 606 | /* What endpoint received this chunk? */ |
| 607 | struct sctp_ep_common *rcvr; |
| 608 | |
| 609 | /* We fill this in if we are calculating RTT. */ |
| 610 | unsigned long sent_at; |
| 611 | |
| 612 | /* What is the origin IP address for this chunk? */ |
| 613 | union sctp_addr source; |
| 614 | /* Destination address for this chunk. */ |
| 615 | union sctp_addr dest; |
| 616 | |
| 617 | /* For outbound message, track all fragments for SEND_FAILED. */ |
| 618 | struct sctp_datamsg *msg; |
| 619 | |
| 620 | /* For an inbound chunk, this tells us where it came from. |
| 621 | * For an outbound chunk, it tells us where we'd like it to |
| 622 | * go. It is NULL if we have no preference. |
| 623 | */ |
| 624 | struct sctp_transport *transport; |
| 625 | |
Vlad Yasevich | bbd0d59 | 2007-10-03 17:51:34 -0700 | [diff] [blame] | 626 | /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO |
| 627 | * we need save a pointer to the AUTH chunk, since the SCTP-AUTH |
| 628 | * spec violates the principle premis that all chunks are processed |
| 629 | * in order. |
| 630 | */ |
| 631 | struct sk_buff *auth_chunk; |
| 632 | |
Neil Horman | c226ef9 | 2008-07-25 12:44:09 -0400 | [diff] [blame] | 633 | #define SCTP_CAN_FRTX 0x0 |
| 634 | #define SCTP_NEED_FRTX 0x1 |
| 635 | #define SCTP_DONT_FRTX 0x2 |
| 636 | __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ |
Xufeng Zhang | 6eabca5 | 2013-11-25 11:26:57 +0800 | [diff] [blame] | 637 | resent:1, /* Has this chunk ever been resent. */ |
Neil Horman | c226ef9 | 2008-07-25 12:44:09 -0400 | [diff] [blame] | 638 | has_tsn:1, /* Does this chunk have a TSN yet? */ |
| 639 | has_ssn:1, /* Does this chunk have a SSN yet? */ |
| 640 | singleton:1, /* Only chunk in the packet? */ |
| 641 | end_of_packet:1, /* Last chunk in the packet? */ |
| 642 | ecn_ce_done:1, /* Have we processed the ECN CE bit? */ |
| 643 | pdiscard:1, /* Discard the whole packet now? */ |
| 644 | tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ |
| 645 | data_accepted:1, /* At least 1 chunk accepted */ |
| 646 | auth:1, /* IN: was auth'ed | OUT: needs auth */ |
| 647 | has_asconf:1, /* IN: have seen an asconf before */ |
| 648 | tsn_missing_report:2, /* Data chunk missing counter. */ |
| 649 | fast_retransmit:2; /* Is this chunk fast retransmitted? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | }; |
| 651 | |
| 652 | void sctp_chunk_hold(struct sctp_chunk *); |
| 653 | void sctp_chunk_put(struct sctp_chunk *); |
Al Viro | e0eb093 | 2014-11-15 01:11:23 -0500 | [diff] [blame] | 654 | int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, |
| 655 | struct iov_iter *from); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | void sctp_chunk_free(struct sctp_chunk *); |
| 657 | void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); |
| 658 | struct sctp_chunk *sctp_chunkify(struct sk_buff *, |
| 659 | const struct sctp_association *, |
| 660 | struct sock *); |
| 661 | void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, |
| 662 | union sctp_addr *); |
| 663 | const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); |
| 664 | |
Vlad Yasevich | f57d96b | 2007-12-20 14:12:24 -0800 | [diff] [blame] | 665 | enum { |
| 666 | SCTP_ADDR_NEW, /* new address added to assoc/ep */ |
| 667 | SCTP_ADDR_SRC, /* address can be used as source */ |
| 668 | SCTP_ADDR_DEL, /* address about to be deleted */ |
| 669 | }; |
| 670 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | /* This is a structure for holding either an IPv6 or an IPv4 address. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | struct sctp_sockaddr_entry { |
| 673 | struct list_head list; |
Vlad Yasevich | 2930354 | 2007-09-16 16:02:12 -0700 | [diff] [blame] | 674 | struct rcu_head rcu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | union sctp_addr a; |
Vlad Yasevich | f57d96b | 2007-12-20 14:12:24 -0800 | [diff] [blame] | 676 | __u8 state; |
Vlad Yasevich | 2930354 | 2007-09-16 16:02:12 -0700 | [diff] [blame] | 677 | __u8 valid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | }; |
| 679 | |
Michio Honda | 9f7d653 | 2011-04-26 19:32:51 +0900 | [diff] [blame] | 680 | #define SCTP_ADDRESS_TICK_DELAY 500 |
| 681 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); |
| 683 | |
| 684 | /* This structure holds lists of chunks as we are assembling for |
| 685 | * transmission. |
| 686 | */ |
| 687 | struct sctp_packet { |
| 688 | /* These are the SCTP header values (host order) for the packet. */ |
| 689 | __u16 source_port; |
| 690 | __u16 destination_port; |
| 691 | __u32 vtag; |
| 692 | |
| 693 | /* This contains the payload chunks. */ |
David S. Miller | 79af02c | 2005-07-08 21:47:49 -0700 | [diff] [blame] | 694 | struct list_head chunk_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
| 696 | /* This is the overhead of the sctp and ip headers. */ |
| 697 | size_t overhead; |
| 698 | /* This is the total size of all chunks INCLUDING padding. */ |
| 699 | size_t size; |
| 700 | |
| 701 | /* The packet is destined for this transport address. |
| 702 | * The function we finally use to pass down to the next lower |
| 703 | * layer lives in the transport structure. |
| 704 | */ |
| 705 | struct sctp_transport *transport; |
| 706 | |
Vlad Yasevich | 1f48564 | 2007-10-09 01:15:59 -0700 | [diff] [blame] | 707 | /* pointer to the auth chunk for this packet */ |
| 708 | struct sctp_chunk *auth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | |
Vlad Yasevich | a803c94 | 2009-09-04 18:21:01 -0400 | [diff] [blame] | 710 | u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ |
| 711 | has_sack:1, /* This packet contains a SACK chunk. */ |
| 712 | has_auth:1, /* This packet contains an AUTH chunk */ |
| 713 | has_data:1, /* This packet contains at least 1 DATA chunk */ |
Daniel Borkmann | 3e3251b | 2013-04-18 21:59:37 +0000 | [diff] [blame] | 714 | ipfragok:1; /* So let ip fragment this packet */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | }; |
| 716 | |
| 717 | struct sctp_packet *sctp_packet_init(struct sctp_packet *, |
| 718 | struct sctp_transport *, |
| 719 | __u16 sport, __u16 dport); |
| 720 | struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); |
| 721 | sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, |
Vlad Yasevich | 2e3216c | 2008-06-19 16:08:18 -0700 | [diff] [blame] | 722 | struct sctp_chunk *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, |
| 724 | struct sctp_chunk *); |
| 725 | int sctp_packet_transmit(struct sctp_packet *); |
| 726 | void sctp_packet_free(struct sctp_packet *); |
| 727 | |
| 728 | static inline int sctp_packet_empty(struct sctp_packet *packet) |
| 729 | { |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 730 | return packet->size == packet->overhead; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | } |
| 732 | |
| 733 | /* This represents a remote transport address. |
| 734 | * For local transport addresses, we just use union sctp_addr. |
| 735 | * |
| 736 | * RFC2960 Section 1.4 Key Terms |
| 737 | * |
| 738 | * o Transport address: A Transport Address is traditionally defined |
| 739 | * by Network Layer address, Transport Layer protocol and Transport |
| 740 | * Layer port number. In the case of SCTP running over IP, a |
| 741 | * transport address is defined by the combination of an IP address |
| 742 | * and an SCTP port number (where SCTP is the Transport protocol). |
| 743 | * |
| 744 | * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control |
| 745 | * |
| 746 | * o The sender keeps a separate congestion control parameter set for |
| 747 | * each of the destination addresses it can send to (not each |
| 748 | * source-destination pair but for each destination). The parameters |
| 749 | * should decay if the address is not used for a long enough time |
| 750 | * period. |
| 751 | * |
| 752 | */ |
| 753 | struct sctp_transport { |
| 754 | /* A list of transports. */ |
| 755 | struct list_head transports; |
| 756 | |
| 757 | /* Reference counting. */ |
| 758 | atomic_t refcnt; |
Dan Carpenter | ff93793 | 2010-05-26 00:40:11 -0700 | [diff] [blame] | 759 | __u32 dead:1, |
Vlad Yasevich | c0058a3 | 2010-04-30 22:41:09 -0400 | [diff] [blame] | 760 | /* RTO-Pending : A flag used to track if one of the DATA |
| 761 | * chunks sent to this address is currently being |
| 762 | * used to compute a RTT. If this flag is 0, |
| 763 | * the next DATA chunk sent to this destination |
| 764 | * should be used to compute a RTT and this flag |
| 765 | * should be set. Every time the RTT |
| 766 | * calculation completes (i.e. the DATA chunk |
| 767 | * is SACK'd) clear this flag. |
| 768 | */ |
| 769 | rto_pending:1, |
| 770 | |
| 771 | /* |
| 772 | * hb_sent : a flag that signals that we have a pending |
| 773 | * heartbeat. |
| 774 | */ |
| 775 | hb_sent:1, |
| 776 | |
Vlad Yasevich | c0058a3 | 2010-04-30 22:41:09 -0400 | [diff] [blame] | 777 | /* Is the Path MTU update pending on this tranport */ |
Daniel Borkmann | 8fa5df6 | 2013-04-16 11:07:15 +0000 | [diff] [blame] | 778 | pmtu_pending:1; |
Vlad Yasevich | c0058a3 | 2010-04-30 22:41:09 -0400 | [diff] [blame] | 779 | |
Neil Horman | 4244854 | 2012-06-30 03:04:26 +0000 | [diff] [blame] | 780 | /* Has this transport moved the ctsn since we last sacked */ |
| 781 | __u32 sack_generation; |
fan.du | 5a13929 | 2013-08-05 17:13:03 +0800 | [diff] [blame] | 782 | u32 dst_cookie; |
Neil Horman | 4244854 | 2012-06-30 03:04:26 +0000 | [diff] [blame] | 783 | |
David S. Miller | 8663c93 | 2011-05-06 16:32:47 -0700 | [diff] [blame] | 784 | struct flowi fl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | |
| 786 | /* This is the peer's IP address and port. */ |
| 787 | union sctp_addr ipaddr; |
| 788 | |
| 789 | /* These are the functions we call to handle LLP stuff. */ |
| 790 | struct sctp_af *af_specific; |
| 791 | |
| 792 | /* Which association do we belong to? */ |
| 793 | struct sctp_association *asoc; |
| 794 | |
| 795 | /* RFC2960 |
| 796 | * |
| 797 | * 12.3 Per Transport Address Data |
| 798 | * |
| 799 | * For each destination transport address in the peer's |
| 800 | * address list derived from the INIT or INIT ACK chunk, a |
| 801 | * number of data elements needs to be maintained including: |
| 802 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | /* RTO : The current retransmission timeout value. */ |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 804 | unsigned long rto; |
Vlad Yasevich | b6157d8 | 2007-10-24 15:59:16 -0400 | [diff] [blame] | 805 | |
| 806 | __u32 rtt; /* This is the most recent RTT. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | |
| 808 | /* RTTVAR : The current RTT variation. */ |
| 809 | __u32 rttvar; |
| 810 | |
| 811 | /* SRTT : The current smoothed round trip time. */ |
| 812 | __u32 srtt; |
| 813 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | /* |
| 815 | * These are the congestion stats. |
| 816 | */ |
| 817 | /* cwnd : The current congestion window. */ |
| 818 | __u32 cwnd; /* This is the actual cwnd. */ |
| 819 | |
| 820 | /* ssthresh : The current slow start threshold value. */ |
| 821 | __u32 ssthresh; |
| 822 | |
| 823 | /* partial : The tracking method for increase of cwnd when in |
| 824 | * bytes acked : congestion avoidance mode (see Section 6.2.2) |
| 825 | */ |
| 826 | __u32 partial_bytes_acked; |
| 827 | |
| 828 | /* Data that has been sent, but not acknowledged. */ |
| 829 | __u32 flight_size; |
| 830 | |
Vlad Yasevich | 46d5a80 | 2009-11-23 15:54:00 -0500 | [diff] [blame] | 831 | __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ |
| 832 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | /* Destination */ |
| 834 | struct dst_entry *dst; |
| 835 | /* Source address. */ |
| 836 | union sctp_addr saddr; |
| 837 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
| 839 | * the destination address every heartbeat interval. |
| 840 | */ |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 841 | unsigned long hbinterval; |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 842 | |
| 843 | /* SACK delay timeout */ |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 844 | unsigned long sackdelay; |
Wei Yongjun | d364d92 | 2008-05-09 15:13:26 -0700 | [diff] [blame] | 845 | __u32 sackfreq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | |
Daniel Borkmann | e575235f | 2014-06-11 18:19:30 +0200 | [diff] [blame] | 847 | /* When was the last time that we heard from this transport? We use |
| 848 | * this to pick new active and retran paths. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | */ |
Daniel Borkmann | e575235f | 2014-06-11 18:19:30 +0200 | [diff] [blame] | 850 | ktime_t last_time_heard; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | |
| 852 | /* Last time(in jiffies) when cwnd is reduced due to the congestion |
| 853 | * indication based on ECNE chunk. |
| 854 | */ |
| 855 | unsigned long last_time_ecne_reduced; |
| 856 | |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 857 | /* This is the max_retrans value for the transport and will |
| 858 | * be initialized from the assocs value. This can be changed |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 859 | * using the SCTP_SET_PEER_ADDR_PARAMS socket option. |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 860 | */ |
| 861 | __u16 pathmaxrxt; |
| 862 | |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 863 | /* This is the partially failed retrans value for the transport |
| 864 | * and will be initialized from the assocs value. This can be changed |
| 865 | * using the SCTP_PEER_ADDR_THLDS socket option |
| 866 | */ |
| 867 | int pf_retrans; |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 868 | /* PMTU : The current known path MTU. */ |
| 869 | __u32 pathmtu; |
| 870 | |
Joe Perches | f4ab2f72 | 2007-12-20 13:56:32 -0800 | [diff] [blame] | 871 | /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 872 | __u32 param_flags; |
| 873 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 874 | /* The number of times INIT has been sent on this transport. */ |
| 875 | int init_sent_count; |
| 876 | |
| 877 | /* state : The current state of this destination, |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 878 | * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | */ |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 880 | int state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | /* These are the error stats for this destination. */ |
| 883 | |
| 884 | /* Error count : The current error count for this destination. */ |
| 885 | unsigned short error_count; |
| 886 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | /* Per : A timer used by each destination. |
| 888 | * Destination : |
| 889 | * Timer : |
| 890 | * |
| 891 | * [Everywhere else in the text this is called T3-rtx. -ed] |
| 892 | */ |
| 893 | struct timer_list T3_rtx_timer; |
| 894 | |
| 895 | /* Heartbeat timer is per destination. */ |
| 896 | struct timer_list hb_timer; |
| 897 | |
Vlad Yasevich | 50b5d6a | 2010-05-06 00:56:07 -0700 | [diff] [blame] | 898 | /* Timer to handle ICMP proto unreachable envets */ |
| 899 | struct timer_list proto_unreach_timer; |
| 900 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | /* Since we're using per-destination retransmission timers |
| 902 | * (see above), we're also using per-destination "transmitted" |
| 903 | * queues. This probably ought to be a private struct |
| 904 | * accessible only within the outqueue, but it's not, yet. |
| 905 | */ |
| 906 | struct list_head transmitted; |
| 907 | |
| 908 | /* We build bundle-able packets for this transport here. */ |
| 909 | struct sctp_packet packet; |
| 910 | |
| 911 | /* This is the list of transports that have chunks to send. */ |
| 912 | struct list_head send_ready; |
| 913 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | /* State information saved for SFR_CACC algorithm. The key |
| 915 | * idea in SFR_CACC is to maintain state at the sender on a |
| 916 | * per-destination basis when a changeover happens. |
| 917 | * char changeover_active; |
| 918 | * char cycling_changeover; |
| 919 | * __u32 next_tsn_at_change; |
| 920 | * char cacc_saw_newack; |
| 921 | */ |
| 922 | struct { |
| 923 | /* An unsigned integer, which stores the next TSN to be |
| 924 | * used by the sender, at the moment of changeover. |
| 925 | */ |
| 926 | __u32 next_tsn_at_change; |
| 927 | |
| 928 | /* A flag which indicates the occurrence of a changeover */ |
| 929 | char changeover_active; |
| 930 | |
| 931 | /* A flag which indicates whether the change of primary is |
| 932 | * the first switch to this destination address during an |
| 933 | * active switch. |
| 934 | */ |
| 935 | char cycling_changeover; |
| 936 | |
| 937 | /* A temporary flag, which is used during the processing of |
| 938 | * a SACK to estimate the causative TSN(s)'s group. |
| 939 | */ |
| 940 | char cacc_saw_newack; |
| 941 | } cacc; |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 942 | |
| 943 | /* 64-bit random number sent with heartbeat. */ |
| 944 | __u64 hb_nonce; |
Thomas Graf | 45122ca26 | 2012-12-06 09:25:05 +0000 | [diff] [blame] | 945 | |
| 946 | struct rcu_head rcu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | }; |
| 948 | |
Eric W. Biederman | 89bf345 | 2012-08-07 07:26:14 +0000 | [diff] [blame] | 949 | struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 950 | gfp_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | void sctp_transport_set_owner(struct sctp_transport *, |
| 952 | struct sctp_association *); |
| 953 | void sctp_transport_route(struct sctp_transport *, union sctp_addr *, |
| 954 | struct sctp_sock *); |
Vlad Yasevich | 9914ae3 | 2011-04-26 21:51:31 +0000 | [diff] [blame] | 955 | void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | void sctp_transport_free(struct sctp_transport *); |
Vlad Yasevich | ae19c54 | 2010-04-30 22:41:09 -0400 | [diff] [blame] | 957 | void sctp_transport_reset_timers(struct sctp_transport *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | void sctp_transport_hold(struct sctp_transport *); |
| 959 | void sctp_transport_put(struct sctp_transport *); |
| 960 | void sctp_transport_update_rto(struct sctp_transport *, __u32); |
| 961 | void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); |
| 962 | void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); |
Vlad Yasevich | 46d5a80 | 2009-11-23 15:54:00 -0500 | [diff] [blame] | 963 | void sctp_transport_burst_limited(struct sctp_transport *); |
| 964 | void sctp_transport_burst_reset(struct sctp_transport *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | unsigned long sctp_transport_timeout(struct sctp_transport *); |
Vlad Yasevich | 749bf92 | 2007-03-19 17:02:30 -0700 | [diff] [blame] | 966 | void sctp_transport_reset(struct sctp_transport *); |
David S. Miller | 02f3d4c | 2012-07-16 03:57:14 -0700 | [diff] [blame] | 967 | void sctp_transport_update_pmtu(struct sock *, struct sctp_transport *, u32); |
Michio Honda | ddc4bbe | 2011-06-17 11:03:23 +0900 | [diff] [blame] | 968 | void sctp_transport_immediate_rtx(struct sctp_transport *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | |
| 970 | |
| 971 | /* This is the structure we use to queue packets as they come into |
| 972 | * SCTP. We write packets to it and read chunks from it. |
| 973 | */ |
| 974 | struct sctp_inq { |
| 975 | /* This is actually a queue of sctp_chunk each |
| 976 | * containing a partially decoded packet. |
| 977 | */ |
David S. Miller | 79af02c | 2005-07-08 21:47:49 -0700 | [diff] [blame] | 978 | struct list_head in_chunk_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | /* This is the packet which is currently off the in queue and is |
| 980 | * being worked on through the inbound chunk processing. |
| 981 | */ |
| 982 | struct sctp_chunk *in_progress; |
| 983 | |
| 984 | /* This is the delayed task to finish delivering inbound |
| 985 | * messages. |
| 986 | */ |
| 987 | struct work_struct immediate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | }; |
| 989 | |
| 990 | void sctp_inq_init(struct sctp_inq *); |
| 991 | void sctp_inq_free(struct sctp_inq *); |
| 992 | void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); |
| 993 | struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); |
Vlad Yasevich | bbd0d59 | 2007-10-03 17:51:34 -0700 | [diff] [blame] | 994 | struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 995 | void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | |
| 997 | /* This is the structure we use to hold outbound chunks. You push |
| 998 | * chunks in and they automatically pop out the other end as bundled |
| 999 | * packets (it calls (*output_handler)()). |
| 1000 | * |
| 1001 | * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, |
| 1002 | * and 8.2 of the v13 draft. |
| 1003 | * |
| 1004 | * It handles retransmissions. The connection to the timeout portion |
| 1005 | * of the state machine is through sctp_..._timeout() and timeout_handler. |
| 1006 | * |
| 1007 | * If you feed it SACKs, it will eat them. |
| 1008 | * |
| 1009 | * If you give it big chunks, it will fragment them. |
| 1010 | * |
| 1011 | * It assigns TSN's to data chunks. This happens at the last possible |
| 1012 | * instant before transmission. |
| 1013 | * |
| 1014 | * When free()'d, it empties itself out via output_handler(). |
| 1015 | */ |
| 1016 | struct sctp_outq { |
| 1017 | struct sctp_association *asoc; |
| 1018 | |
| 1019 | /* Data pending that has never been transmitted. */ |
David S. Miller | 79af02c | 2005-07-08 21:47:49 -0700 | [diff] [blame] | 1020 | struct list_head out_chunk_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1022 | unsigned int out_qlen; /* Total length of queued data chunks. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | |
| 1024 | /* Error of send failed, may used in SCTP_SEND_FAILED event. */ |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1025 | unsigned int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | |
| 1027 | /* These are control chunks we want to send. */ |
David S. Miller | 79af02c | 2005-07-08 21:47:49 -0700 | [diff] [blame] | 1028 | struct list_head control_chunk_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | |
| 1030 | /* These are chunks that have been sacked but are above the |
| 1031 | * CTSN, or cumulative tsn ack point. |
| 1032 | */ |
| 1033 | struct list_head sacked; |
| 1034 | |
| 1035 | /* Put chunks on this list to schedule them for |
| 1036 | * retransmission. |
| 1037 | */ |
| 1038 | struct list_head retransmit; |
| 1039 | |
| 1040 | /* Put chunks on this list to save them for FWD TSN processing as |
| 1041 | * they were abandoned. |
| 1042 | */ |
| 1043 | struct list_head abandoned; |
| 1044 | |
| 1045 | /* How many unackd bytes do we have in-flight? */ |
| 1046 | __u32 outstanding_bytes; |
| 1047 | |
Vlad Yasevich | 62aeaff | 2008-06-04 12:39:11 -0700 | [diff] [blame] | 1048 | /* Are we doing fast-rtx on this queue */ |
| 1049 | char fast_rtx; |
| 1050 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | /* Corked? */ |
| 1052 | char cork; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | }; |
| 1054 | |
| 1055 | void sctp_outq_init(struct sctp_association *, struct sctp_outq *); |
| 1056 | void sctp_outq_teardown(struct sctp_outq *); |
| 1057 | void sctp_outq_free(struct sctp_outq*); |
| 1058 | int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); |
Nicolas Dichtel | edfee03 | 2012-10-03 05:43:22 +0000 | [diff] [blame] | 1059 | int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | int sctp_outq_is_empty(const struct sctp_outq *); |
| 1061 | void sctp_outq_restart(struct sctp_outq *); |
| 1062 | |
| 1063 | void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, |
| 1064 | sctp_retransmit_reason_t); |
| 1065 | void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); |
| 1066 | int sctp_outq_uncork(struct sctp_outq *); |
| 1067 | /* Uncork and flush an outqueue. */ |
| 1068 | static inline void sctp_outq_cork(struct sctp_outq *q) |
| 1069 | { |
| 1070 | q->cork = 1; |
| 1071 | } |
| 1072 | |
| 1073 | /* These bind address data fields common between endpoints and associations */ |
| 1074 | struct sctp_bind_addr { |
| 1075 | |
| 1076 | /* RFC 2960 12.1 Parameters necessary for the SCTP instance |
| 1077 | * |
| 1078 | * SCTP Port: The local SCTP port number the endpoint is |
| 1079 | * bound to. |
| 1080 | */ |
| 1081 | __u16 port; |
| 1082 | |
| 1083 | /* RFC 2960 12.1 Parameters necessary for the SCTP instance |
| 1084 | * |
| 1085 | * Address List: The list of IP addresses that this instance |
| 1086 | * has bound. This information is passed to one's |
| 1087 | * peer(s) in INIT and INIT ACK chunks. |
| 1088 | */ |
| 1089 | struct list_head address_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | }; |
| 1091 | |
| 1092 | void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); |
| 1093 | void sctp_bind_addr_free(struct sctp_bind_addr *); |
Eric W. Biederman | 4db67e8 | 2012-08-06 08:42:04 +0000 | [diff] [blame] | 1094 | int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | const struct sctp_bind_addr *src, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1096 | sctp_scope_t scope, gfp_t gfp, |
Alexey Dobriyan | 3182cd8 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 1097 | int flags); |
Vlad Yasevich | 8e71a11 | 2007-12-06 22:50:54 -0800 | [diff] [blame] | 1098 | int sctp_bind_addr_dup(struct sctp_bind_addr *dest, |
| 1099 | const struct sctp_bind_addr *src, |
| 1100 | gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, |
Vlad Yasevich | f57d96b | 2007-12-20 14:12:24 -0800 | [diff] [blame] | 1102 | __u8 addr_state, gfp_t gfp); |
Vlad Yasevich | 0ed90fb | 2007-10-24 16:10:00 -0400 | [diff] [blame] | 1103 | int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, |
| 1105 | struct sctp_sock *); |
Vlad Yasevich | 7dab83d | 2008-07-18 23:05:40 -0700 | [diff] [blame] | 1106 | int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, |
| 1107 | struct sctp_sock *, struct sctp_sock *); |
Vlad Yasevich | 75205f4 | 2007-12-20 14:12:59 -0800 | [diff] [blame] | 1108 | int sctp_bind_addr_state(const struct sctp_bind_addr *bp, |
| 1109 | const union sctp_addr *addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, |
| 1111 | const union sctp_addr *addrs, |
| 1112 | int addrcnt, |
| 1113 | struct sctp_sock *opt); |
| 1114 | union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, |
Alexey Dobriyan | 3182cd8 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 1115 | int *addrs_len, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1116 | gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1118 | __u16 port, gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | |
| 1120 | sctp_scope_t sctp_scope(const union sctp_addr *); |
Eric W. Biederman | e7ff4a7 | 2012-08-07 07:27:02 +0000 | [diff] [blame] | 1121 | int sctp_in_scope(struct net *net, const union sctp_addr *addr, const sctp_scope_t scope); |
Vlad Yasevich | 52cae8f | 2008-08-18 10:34:34 -0400 | [diff] [blame] | 1122 | int sctp_is_any(struct sock *sk, const union sctp_addr *addr); |
Michio Honda | 9f7d653 | 2011-04-26 19:32:51 +0900 | [diff] [blame] | 1123 | int sctp_is_ep_boundall(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | |
| 1125 | |
| 1126 | /* What type of endpoint? */ |
| 1127 | typedef enum { |
| 1128 | SCTP_EP_TYPE_SOCKET, |
| 1129 | SCTP_EP_TYPE_ASSOCIATION, |
| 1130 | } sctp_endpoint_type_t; |
| 1131 | |
| 1132 | /* |
| 1133 | * A common base class to bridge the implmentation view of a |
| 1134 | * socket (usually listening) endpoint versus an association's |
| 1135 | * local endpoint. |
| 1136 | * This common structure is useful for several purposes: |
| 1137 | * 1) Common interface for lookup routines. |
| 1138 | * a) Subfunctions work for either endpoint or association |
| 1139 | * b) Single interface to lookup allows hiding the lookup lock rather |
| 1140 | * than acquiring it externally. |
| 1141 | * 2) Common interface for the inbound chunk handling/state machine. |
| 1142 | * 3) Common object handling routines for reference counting, etc. |
| 1143 | * 4) Disentangle association lookup from endpoint lookup, where we |
| 1144 | * do not have to find our endpoint to find our association. |
| 1145 | * |
| 1146 | */ |
| 1147 | |
| 1148 | struct sctp_ep_common { |
| 1149 | /* Fields to help us manage our entries in the hash tables. */ |
Vlad Yasevich | d970dbf | 2007-11-09 11:43:40 -0500 | [diff] [blame] | 1150 | struct hlist_node node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | int hashent; |
| 1152 | |
| 1153 | /* Runtime type information. What kind of endpoint is this? */ |
| 1154 | sctp_endpoint_type_t type; |
| 1155 | |
| 1156 | /* Some fields to help us manage this object. |
| 1157 | * refcnt - Reference count access to this object. |
| 1158 | * dead - Do not attempt to use this object. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | */ |
| 1160 | atomic_t refcnt; |
Daniel Borkmann | 0022d2d | 2013-04-15 03:27:18 +0000 | [diff] [blame] | 1161 | bool dead; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | |
| 1163 | /* What socket does this endpoint belong to? */ |
| 1164 | struct sock *sk; |
| 1165 | |
| 1166 | /* This is where we receive inbound chunks. */ |
| 1167 | struct sctp_inq inqueue; |
| 1168 | |
| 1169 | /* This substructure includes the defining parameters of the |
| 1170 | * endpoint: |
| 1171 | * bind_addr.port is our shared port number. |
| 1172 | * bind_addr.address_list is our set of local IP addresses. |
| 1173 | */ |
| 1174 | struct sctp_bind_addr bind_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | }; |
| 1176 | |
| 1177 | |
| 1178 | /* RFC Section 1.4 Key Terms |
| 1179 | * |
| 1180 | * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a |
| 1181 | * multi-homed host, an SCTP endpoint is represented to its peers as a |
| 1182 | * combination of a set of eligible destination transport addresses to |
| 1183 | * which SCTP packets can be sent and a set of eligible source |
| 1184 | * transport addresses from which SCTP packets can be received. |
| 1185 | * All transport addresses used by an SCTP endpoint must use the |
| 1186 | * same port number, but can use multiple IP addresses. A transport |
| 1187 | * address used by an SCTP endpoint must not be used by another |
| 1188 | * SCTP endpoint. In other words, a transport address is unique |
| 1189 | * to an SCTP endpoint. |
| 1190 | * |
| 1191 | * From an implementation perspective, each socket has one of these. |
| 1192 | * A TCP-style socket will have exactly one association on one of |
| 1193 | * these. An UDP-style socket will have multiple associations hanging |
| 1194 | * off one of these. |
| 1195 | */ |
| 1196 | |
| 1197 | struct sctp_endpoint { |
| 1198 | /* Common substructure for endpoint and association. */ |
| 1199 | struct sctp_ep_common base; |
| 1200 | |
| 1201 | /* Associations: A list of current associations and mappings |
| 1202 | * to the data consumers for each association. This |
| 1203 | * may be in the form of a hash table or other |
| 1204 | * implementation dependent structure. The data |
| 1205 | * consumers may be process identification |
| 1206 | * information such as file descriptors, named pipe |
| 1207 | * pointer, or table pointers dependent on how SCTP |
| 1208 | * is implemented. |
| 1209 | */ |
| 1210 | /* This is really a list of struct sctp_association entries. */ |
| 1211 | struct list_head asocs; |
| 1212 | |
| 1213 | /* Secret Key: A secret key used by this endpoint to compute |
| 1214 | * the MAC. This SHOULD be a cryptographic quality |
| 1215 | * random number with a sufficient length. |
| 1216 | * Discussion in [RFC1750] can be helpful in |
| 1217 | * selection of the key. |
| 1218 | */ |
Daniel Borkmann | 570617e | 2013-02-12 05:15:33 +0000 | [diff] [blame] | 1219 | __u8 secret_key[SCTP_SECRET_SIZE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | |
Vlad Yasevich | 313e7b4 | 2006-01-17 11:55:57 -0800 | [diff] [blame] | 1221 | /* digest: This is a digest of the sctp cookie. This field is |
| 1222 | * only used on the receive path when we try to validate |
| 1223 | * that the cookie has not been tampered with. We put |
| 1224 | * this here so we pre-allocate this once and can re-use |
| 1225 | * on every receive. |
| 1226 | */ |
Vlad Yasevich | b68dbca | 2006-11-09 16:29:57 -0800 | [diff] [blame] | 1227 | __u8 *digest; |
Vlad Yasevich | 313e7b4 | 2006-01-17 11:55:57 -0800 | [diff] [blame] | 1228 | |
Neil Horman | 4eb701d | 2005-04-28 12:02:04 -0700 | [diff] [blame] | 1229 | /* sendbuf acct. policy. */ |
| 1230 | __u32 sndbuf_policy; |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 1231 | |
| 1232 | /* rcvbuf acct. policy. */ |
| 1233 | __u32 rcvbuf_policy; |
Vlad Yasevich | 1f48564 | 2007-10-09 01:15:59 -0700 | [diff] [blame] | 1234 | |
| 1235 | /* SCTP AUTH: array of the HMACs that will be allocated |
| 1236 | * we need this per association so that we don't serialize |
| 1237 | */ |
| 1238 | struct crypto_hash **auth_hmacs; |
| 1239 | |
| 1240 | /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ |
| 1241 | struct sctp_hmac_algo_param *auth_hmacs_list; |
| 1242 | |
| 1243 | /* SCTP-AUTH: chunks to authenticate encoded into parameter */ |
| 1244 | struct sctp_chunks_param *auth_chunk_list; |
| 1245 | |
| 1246 | /* SCTP-AUTH: endpoint shared keys */ |
| 1247 | struct list_head endpoint_shared_keys; |
| 1248 | __u16 active_key_id; |
Vlad Yasevich | b14878c | 2014-04-17 17:26:50 +0200 | [diff] [blame] | 1249 | __u8 auth_enable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | }; |
| 1251 | |
| 1252 | /* Recover the outter endpoint structure. */ |
| 1253 | static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) |
| 1254 | { |
| 1255 | struct sctp_endpoint *ep; |
| 1256 | |
| 1257 | ep = container_of(base, struct sctp_endpoint, base); |
| 1258 | return ep; |
| 1259 | } |
| 1260 | |
| 1261 | /* These are function signatures for manipulating endpoints. */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1262 | struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | void sctp_endpoint_free(struct sctp_endpoint *); |
| 1264 | void sctp_endpoint_put(struct sctp_endpoint *); |
| 1265 | void sctp_endpoint_hold(struct sctp_endpoint *); |
| 1266 | void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); |
| 1267 | struct sctp_association *sctp_endpoint_lookup_assoc( |
| 1268 | const struct sctp_endpoint *ep, |
| 1269 | const union sctp_addr *paddr, |
| 1270 | struct sctp_transport **); |
| 1271 | int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, |
| 1272 | const union sctp_addr *); |
| 1273 | struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, |
Eric W. Biederman | 4cdadcb | 2012-08-06 08:40:21 +0000 | [diff] [blame] | 1274 | struct net *, const union sctp_addr *); |
Eric W. Biederman | 4110cc2 | 2012-08-06 08:41:13 +0000 | [diff] [blame] | 1275 | int sctp_has_association(struct net *net, const union sctp_addr *laddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | const union sctp_addr *paddr); |
| 1277 | |
Vlad Yasevich | b14878c | 2014-04-17 17:26:50 +0200 | [diff] [blame] | 1278 | int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, |
| 1279 | const struct sctp_association *asoc, |
Eric W. Biederman | f53b5b0 | 2012-08-07 07:29:08 +0000 | [diff] [blame] | 1280 | sctp_cid_t, sctp_init_chunk_t *peer_init, |
| 1281 | struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); |
Wei Yongjun | de6becd | 2011-04-19 21:30:51 +0000 | [diff] [blame] | 1282 | int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | const union sctp_addr *peer, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1284 | sctp_init_chunk_t *init, gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | __u32 sctp_generate_tag(const struct sctp_endpoint *); |
| 1286 | __u32 sctp_generate_tsn(const struct sctp_endpoint *); |
| 1287 | |
Al Viro | e1857ea | 2006-11-20 17:25:32 -0800 | [diff] [blame] | 1288 | struct sctp_inithdr_host { |
| 1289 | __u32 init_tag; |
| 1290 | __u32 a_rwnd; |
| 1291 | __u16 num_outbound_streams; |
| 1292 | __u16 num_inbound_streams; |
| 1293 | __u32 initial_tsn; |
| 1294 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | |
Michele Baldessari | 196d675 | 2012-12-01 04:49:42 +0000 | [diff] [blame] | 1296 | /* SCTP_GET_ASSOC_STATS counters */ |
| 1297 | struct sctp_priv_assoc_stats { |
| 1298 | /* Maximum observed rto in the association during subsequent |
| 1299 | * observations. Value is set to 0 if no RTO measurement took place |
| 1300 | * The transport where the max_rto was observed is returned in |
| 1301 | * obs_rto_ipaddr |
| 1302 | */ |
| 1303 | struct sockaddr_storage obs_rto_ipaddr; |
| 1304 | __u64 max_obs_rto; |
| 1305 | /* Total In and Out SACKs received and sent */ |
| 1306 | __u64 isacks; |
| 1307 | __u64 osacks; |
| 1308 | /* Total In and Out packets received and sent */ |
| 1309 | __u64 opackets; |
| 1310 | __u64 ipackets; |
| 1311 | /* Total retransmitted chunks */ |
| 1312 | __u64 rtxchunks; |
| 1313 | /* TSN received > next expected */ |
| 1314 | __u64 outofseqtsns; |
| 1315 | /* Duplicate Chunks received */ |
| 1316 | __u64 idupchunks; |
| 1317 | /* Gap Ack Blocks received */ |
| 1318 | __u64 gapcnt; |
| 1319 | /* Unordered data chunks sent and received */ |
| 1320 | __u64 ouodchunks; |
| 1321 | __u64 iuodchunks; |
| 1322 | /* Ordered data chunks sent and received */ |
| 1323 | __u64 oodchunks; |
| 1324 | __u64 iodchunks; |
| 1325 | /* Control chunks sent and received */ |
| 1326 | __u64 octrlchunks; |
| 1327 | __u64 ictrlchunks; |
| 1328 | }; |
| 1329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | /* RFC2960 |
| 1331 | * |
| 1332 | * 12. Recommended Transmission Control Block (TCB) Parameters |
| 1333 | * |
| 1334 | * This section details a recommended set of parameters that should |
| 1335 | * be contained within the TCB for an implementation. This section is |
| 1336 | * for illustrative purposes and should not be deemed as requirements |
| 1337 | * on an implementation or as an exhaustive list of all parameters |
| 1338 | * inside an SCTP TCB. Each implementation may need its own additional |
| 1339 | * parameters for optimization. |
| 1340 | */ |
| 1341 | |
| 1342 | |
| 1343 | /* Here we have information about each individual association. */ |
| 1344 | struct sctp_association { |
| 1345 | |
| 1346 | /* A base structure common to endpoint and association. |
| 1347 | * In this context, it represents the associations's view |
| 1348 | * of the local endpoint of the association. |
| 1349 | */ |
| 1350 | struct sctp_ep_common base; |
| 1351 | |
| 1352 | /* Associations on the same socket. */ |
| 1353 | struct list_head asocs; |
| 1354 | |
| 1355 | /* association id. */ |
| 1356 | sctp_assoc_t assoc_id; |
| 1357 | |
| 1358 | /* This is our parent endpoint. */ |
| 1359 | struct sctp_endpoint *ep; |
| 1360 | |
| 1361 | /* These are those association elements needed in the cookie. */ |
| 1362 | struct sctp_cookie c; |
| 1363 | |
| 1364 | /* This is all information about our peer. */ |
| 1365 | struct { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | /* transport_addr_list |
| 1367 | * |
| 1368 | * Peer : A list of SCTP transport addresses that the |
| 1369 | * Transport : peer is bound to. This information is derived |
| 1370 | * Address : from the INIT or INIT ACK and is used to |
| 1371 | * List : associate an inbound packet with a given |
| 1372 | * : association. Normally this information is |
| 1373 | * : hashed or keyed for quick lookup and access |
| 1374 | * : of the TCB. |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1375 | * : The list is also initialized with the list |
| 1376 | * : of addresses passed with the sctp_connectx() |
| 1377 | * : call. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | * |
| 1379 | * It is a list of SCTP_transport's. |
| 1380 | */ |
| 1381 | struct list_head transport_addr_list; |
| 1382 | |
wangweidong | be78cfc | 2013-12-13 13:51:04 +0800 | [diff] [blame] | 1383 | /* rwnd |
| 1384 | * |
| 1385 | * Peer Rwnd : Current calculated value of the peer's rwnd. |
| 1386 | */ |
| 1387 | __u32 rwnd; |
| 1388 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1389 | /* transport_count |
| 1390 | * |
| 1391 | * Peer : A count of the number of peer addresses |
| 1392 | * Transport : in the Peer Transport Address List. |
| 1393 | * Address : |
| 1394 | * Count : |
| 1395 | */ |
| 1396 | __u16 transport_count; |
| 1397 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | /* port |
| 1399 | * The transport layer port number. |
| 1400 | */ |
| 1401 | __u16 port; |
| 1402 | |
| 1403 | /* primary_path |
| 1404 | * |
| 1405 | * Primary : This is the current primary destination |
| 1406 | * Path : transport address of the peer endpoint. It |
| 1407 | * : may also specify a source transport address |
| 1408 | * : on this endpoint. |
| 1409 | * |
| 1410 | * All of these paths live on transport_addr_list. |
| 1411 | * |
| 1412 | * At the bakeoffs, we discovered that the intent of |
| 1413 | * primaryPath is that it only changes when the ULP |
| 1414 | * asks to have it changed. We add the activePath to |
| 1415 | * designate the connection we are currently using to |
| 1416 | * transmit new data and most control chunks. |
| 1417 | */ |
| 1418 | struct sctp_transport *primary_path; |
| 1419 | |
| 1420 | /* Cache the primary path address here, when we |
| 1421 | * need a an address for msg_name. |
| 1422 | */ |
| 1423 | union sctp_addr primary_addr; |
| 1424 | |
| 1425 | /* active_path |
| 1426 | * The path that we are currently using to |
| 1427 | * transmit new data and most control chunks. |
| 1428 | */ |
| 1429 | struct sctp_transport *active_path; |
| 1430 | |
| 1431 | /* retran_path |
| 1432 | * |
| 1433 | * RFC2960 6.4 Multi-homed SCTP Endpoints |
| 1434 | * ... |
| 1435 | * Furthermore, when its peer is multi-homed, an |
| 1436 | * endpoint SHOULD try to retransmit a chunk to an |
| 1437 | * active destination transport address that is |
| 1438 | * different from the last destination address to |
| 1439 | * which the DATA chunk was sent. |
| 1440 | */ |
| 1441 | struct sctp_transport *retran_path; |
| 1442 | |
| 1443 | /* Pointer to last transport I have sent on. */ |
| 1444 | struct sctp_transport *last_sent_to; |
| 1445 | |
| 1446 | /* This is the last transport I have received DATA on. */ |
| 1447 | struct sctp_transport *last_data_from; |
| 1448 | |
| 1449 | /* |
| 1450 | * Mapping An array of bits or bytes indicating which out of |
| 1451 | * Array order TSN's have been received (relative to the |
| 1452 | * Last Rcvd TSN). If no gaps exist, i.e. no out of |
| 1453 | * order packets have been received, this array |
| 1454 | * will be set to all zero. This structure may be |
| 1455 | * in the form of a circular buffer or bit array. |
| 1456 | * |
| 1457 | * Last Rcvd : This is the last TSN received in |
| 1458 | * TSN : sequence. This value is set initially by |
| 1459 | * : taking the peer's Initial TSN, received in |
| 1460 | * : the INIT or INIT ACK chunk, and subtracting |
| 1461 | * : one from it. |
| 1462 | * |
| 1463 | * Throughout most of the specification this is called the |
| 1464 | * "Cumulative TSN ACK Point". In this case, we |
| 1465 | * ignore the advice in 12.2 in favour of the term |
| 1466 | * used in the bulk of the text. This value is hidden |
| 1467 | * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). |
| 1468 | */ |
| 1469 | struct sctp_tsnmap tsn_map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | |
wangweidong | be78cfc | 2013-12-13 13:51:04 +0800 | [diff] [blame] | 1471 | /* This mask is used to disable sending the ASCONF chunk |
| 1472 | * with specified parameter to peer. |
| 1473 | */ |
| 1474 | __be16 addip_disabled_mask; |
| 1475 | |
| 1476 | /* These are capabilities which our peer advertised. */ |
| 1477 | __u8 ecn_capable:1, /* Can peer do ECN? */ |
| 1478 | ipv4_address:1, /* Peer understands IPv4 addresses? */ |
| 1479 | ipv6_address:1, /* Peer understands IPv6 addresses? */ |
| 1480 | hostname_address:1, /* Peer understands DNS addresses? */ |
| 1481 | asconf_capable:1, /* Does peer support ADDIP? */ |
| 1482 | prsctp_capable:1, /* Can peer do PR-SCTP? */ |
| 1483 | auth_capable:1; /* Is peer doing SCTP-AUTH? */ |
| 1484 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | /* Ack State : This flag indicates if the next received |
| 1486 | * : packet is to be responded to with a |
| 1487 | * : SACK. This is initializedto 0. When a packet |
| 1488 | * : is received it is incremented. If this value |
| 1489 | * : reaches 2 or more, a SACK is sent and the |
| 1490 | * : value is reset to 0. Note: This is used only |
| 1491 | * : when no DATA chunks are received out of |
| 1492 | * : order. When DATA chunks are out of order, |
| 1493 | * : SACK's are not delayed (see Section 6). |
| 1494 | */ |
| 1495 | __u8 sack_needed; /* Do we need to sack the peer? */ |
Wei Yongjun | d364d92 | 2008-05-09 15:13:26 -0700 | [diff] [blame] | 1496 | __u32 sack_cnt; |
Neil Horman | 4244854 | 2012-06-30 03:04:26 +0000 | [diff] [blame] | 1497 | __u32 sack_generation; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 1499 | __u32 adaptation_ind; /* Adaptation Code point. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | |
Al Viro | e1857ea | 2006-11-20 17:25:32 -0800 | [diff] [blame] | 1501 | struct sctp_inithdr_host i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | void *cookie; |
wangweidong | be78cfc | 2013-12-13 13:51:04 +0800 | [diff] [blame] | 1503 | int cookie_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | |
| 1505 | /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. |
| 1506 | * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the |
| 1507 | * Initial TSN Value minus 1 |
| 1508 | */ |
| 1509 | __u32 addip_serial; |
Vlad Yasevich | 1f48564 | 2007-10-09 01:15:59 -0700 | [diff] [blame] | 1510 | |
| 1511 | /* SCTP-AUTH: We need to know pears random number, hmac list |
| 1512 | * and authenticated chunk list. All that is part of the |
| 1513 | * cookie and these are just pointers to those locations |
| 1514 | */ |
| 1515 | sctp_random_param_t *peer_random; |
| 1516 | sctp_chunks_param_t *peer_chunks; |
| 1517 | sctp_hmac_algo_param_t *peer_hmacs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | } peer; |
| 1519 | |
| 1520 | /* State : A state variable indicating what state the |
| 1521 | * : association is in, i.e. COOKIE-WAIT, |
| 1522 | * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, |
| 1523 | * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. |
| 1524 | * |
| 1525 | * Note: No "CLOSED" state is illustrated since if a |
| 1526 | * association is "CLOSED" its TCB SHOULD be removed. |
| 1527 | * |
| 1528 | * In this implementation we DO have a CLOSED |
| 1529 | * state which is used during initiation and shutdown. |
| 1530 | * |
| 1531 | * State takes values from SCTP_STATE_*. |
| 1532 | */ |
| 1533 | sctp_state_t state; |
| 1534 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | /* Overall : The overall association error count. |
| 1536 | * Error Count : [Clear this any time I get something.] |
| 1537 | */ |
| 1538 | int overall_error_count; |
| 1539 | |
wangweidong | be78cfc | 2013-12-13 13:51:04 +0800 | [diff] [blame] | 1540 | /* The cookie life I award for any cookie. */ |
| 1541 | ktime_t cookie_life; |
| 1542 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | /* These are the association's initial, max, and min RTO values. |
| 1544 | * These values will be initialized by system defaults, but can |
| 1545 | * be modified via the SCTP_RTOINFO socket option. |
| 1546 | */ |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 1547 | unsigned long rto_initial; |
| 1548 | unsigned long rto_max; |
| 1549 | unsigned long rto_min; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | |
| 1551 | /* Maximum number of new data packets that can be sent in a burst. */ |
| 1552 | int max_burst; |
| 1553 | |
| 1554 | /* This is the max_retrans value for the association. This value will |
| 1555 | * be initialized initialized from system defaults, but can be |
| 1556 | * modified by the SCTP_ASSOCINFO socket option. |
| 1557 | */ |
| 1558 | int max_retrans; |
| 1559 | |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 1560 | /* This is the partially failed retrans value for the transport |
| 1561 | * and will be initialized from the assocs value. This can be |
| 1562 | * changed using the SCTP_PEER_ADDR_THLDS socket option |
| 1563 | */ |
| 1564 | int pf_retrans; |
| 1565 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | /* Maximum number of times the endpoint will retransmit INIT */ |
| 1567 | __u16 max_init_attempts; |
| 1568 | |
| 1569 | /* How many times have we resent an INIT? */ |
| 1570 | __u16 init_retries; |
| 1571 | |
| 1572 | /* The largest timeout or RTO value to use in attempting an INIT */ |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 1573 | unsigned long max_init_timeo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 1575 | /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
| 1576 | * the destination address every heartbeat interval. This value |
| 1577 | * will be inherited by all new transports. |
| 1578 | */ |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 1579 | unsigned long hbinterval; |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 1580 | |
| 1581 | /* This is the max_retrans value for new transports in the |
| 1582 | * association. |
| 1583 | */ |
| 1584 | __u16 pathmaxrxt; |
| 1585 | |
Vlad Yasevich | 8a47949 | 2007-06-07 14:21:05 -0400 | [diff] [blame] | 1586 | /* Flag that path mtu update is pending */ |
| 1587 | __u8 pmtu_pending; |
| 1588 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 1589 | /* Association : The smallest PMTU discovered for all of the |
| 1590 | * PMTU : peer's transport addresses. |
| 1591 | */ |
| 1592 | __u32 pathmtu; |
| 1593 | |
Joe Perches | f4ab2f72 | 2007-12-20 13:56:32 -0800 | [diff] [blame] | 1594 | /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 1595 | __u32 param_flags; |
| 1596 | |
wangweidong | be78cfc | 2013-12-13 13:51:04 +0800 | [diff] [blame] | 1597 | __u32 sackfreq; |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 1598 | /* SACK delay timeout */ |
| 1599 | unsigned long sackdelay; |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 1600 | |
| 1601 | unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; |
| 1603 | |
| 1604 | /* Transport to which SHUTDOWN chunk was last sent. */ |
| 1605 | struct sctp_transport *shutdown_last_sent_to; |
| 1606 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1607 | /* Transport to which INIT chunk was last sent. */ |
| 1608 | struct sctp_transport *init_last_sent_to; |
| 1609 | |
wangweidong | be78cfc | 2013-12-13 13:51:04 +0800 | [diff] [blame] | 1610 | /* How many times have we resent a SHUTDOWN */ |
| 1611 | int shutdown_retries; |
| 1612 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | /* Next TSN : The next TSN number to be assigned to a new |
| 1614 | * : DATA chunk. This is sent in the INIT or INIT |
| 1615 | * : ACK chunk to the peer and incremented each |
| 1616 | * : time a DATA chunk is assigned a TSN |
| 1617 | * : (normally just prior to transmit or during |
| 1618 | * : fragmentation). |
| 1619 | */ |
| 1620 | __u32 next_tsn; |
| 1621 | |
| 1622 | /* |
| 1623 | * Last Rcvd : This is the last TSN received in sequence. This value |
| 1624 | * TSN : is set initially by taking the peer's Initial TSN, |
| 1625 | * : received in the INIT or INIT ACK chunk, and |
| 1626 | * : subtracting one from it. |
| 1627 | * |
| 1628 | * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. |
| 1629 | */ |
| 1630 | |
| 1631 | __u32 ctsn_ack_point; |
| 1632 | |
| 1633 | /* PR-SCTP Advanced.Peer.Ack.Point */ |
| 1634 | __u32 adv_peer_ack_point; |
| 1635 | |
| 1636 | /* Highest TSN that is acknowledged by incoming SACKs. */ |
| 1637 | __u32 highest_sacked; |
| 1638 | |
Vlad Yasevich | cf9b481 | 2010-04-30 22:41:10 -0400 | [diff] [blame] | 1639 | /* TSN marking the fast recovery exit point */ |
| 1640 | __u32 fast_recovery_exit; |
| 1641 | |
| 1642 | /* Flag to track the current fast recovery state */ |
| 1643 | __u8 fast_recovery; |
| 1644 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | /* The number of unacknowledged data chunks. Reported through |
| 1646 | * the SCTP_STATUS sockopt. |
| 1647 | */ |
| 1648 | __u16 unack_data; |
| 1649 | |
Neil Horman | 58fbbed | 2008-02-29 11:40:56 -0800 | [diff] [blame] | 1650 | /* The total number of data chunks that we've had to retransmit |
| 1651 | * as the result of a T3 timer expiration |
| 1652 | */ |
| 1653 | __u32 rtx_data_chunks; |
| 1654 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | /* This is the association's receive buffer space. This value is used |
| 1656 | * to set a_rwnd field in an INIT or a SACK chunk. |
| 1657 | */ |
| 1658 | __u32 rwnd; |
| 1659 | |
| 1660 | /* This is the last advertised value of rwnd over a SACK chunk. */ |
| 1661 | __u32 a_rwnd; |
| 1662 | |
Daniel Borkmann | 362d520 | 2014-04-14 21:45:17 +0200 | [diff] [blame] | 1663 | /* Number of bytes by which the rwnd has slopped. The rwnd is allowed |
| 1664 | * to slop over a maximum of the association's frag_point. |
| 1665 | */ |
| 1666 | __u32 rwnd_over; |
| 1667 | |
| 1668 | /* Keeps treack of rwnd pressure. This happens when we have |
| 1669 | * a window, but not recevie buffer (i.e small packets). This one |
| 1670 | * is releases slowly (1 PMTU at a time ). |
| 1671 | */ |
| 1672 | __u32 rwnd_press; |
| 1673 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | /* This is the sndbuf size in use for the association. |
| 1675 | * This corresponds to the sndbuf size for the association, |
| 1676 | * as specified in the sk->sndbuf. |
| 1677 | */ |
| 1678 | int sndbuf_used; |
| 1679 | |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 1680 | /* This is the amount of memory that this association has allocated |
| 1681 | * in the receive path at any given time. |
| 1682 | */ |
| 1683 | atomic_t rmem_alloc; |
| 1684 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1685 | /* This is the wait queue head for send requests waiting on |
| 1686 | * the association sndbuf space. |
| 1687 | */ |
| 1688 | wait_queue_head_t wait; |
| 1689 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | /* The message size at which SCTP fragmentation will occur. */ |
| 1691 | __u32 frag_point; |
Vlad Yasevich | f68b2e0 | 2009-09-04 18:21:00 -0400 | [diff] [blame] | 1692 | __u32 user_frag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1693 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1694 | /* Counter used to count INIT errors. */ |
| 1695 | int init_err_counter; |
| 1696 | |
| 1697 | /* Count the number of INIT cycles (for doubling timeout). */ |
| 1698 | int init_cycle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | |
| 1700 | /* Default send parameters. */ |
| 1701 | __u16 default_stream; |
| 1702 | __u16 default_flags; |
| 1703 | __u32 default_ppid; |
| 1704 | __u32 default_context; |
| 1705 | __u32 default_timetolive; |
| 1706 | |
Ivan Skytte Jorgensen | 6ab792f | 2006-12-13 16:34:22 -0800 | [diff] [blame] | 1707 | /* Default receive parameters */ |
| 1708 | __u32 default_rcv_context; |
| 1709 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | /* This tracks outbound ssn for a given stream. */ |
| 1711 | struct sctp_ssnmap *ssnmap; |
| 1712 | |
| 1713 | /* All outbound chunks go through this structure. */ |
| 1714 | struct sctp_outq outqueue; |
| 1715 | |
| 1716 | /* A smart pipe that will handle reordering and fragmentation, |
| 1717 | * as well as handle passing events up to the ULP. |
| 1718 | */ |
| 1719 | struct sctp_ulpq ulpq; |
| 1720 | |
| 1721 | /* Last TSN that caused an ECNE Chunk to be sent. */ |
| 1722 | __u32 last_ecne_tsn; |
| 1723 | |
| 1724 | /* Last TSN that caused a CWR Chunk to be sent. */ |
| 1725 | __u32 last_cwr_tsn; |
| 1726 | |
| 1727 | /* How many duplicated TSNs have we seen? */ |
| 1728 | int numduptsns; |
| 1729 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | /* These are to support |
| 1731 | * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses |
| 1732 | * and Enforcement of Flow and Message Limits" |
| 1733 | * <draft-ietf-tsvwg-addip-sctp-02.txt> |
| 1734 | * or "ADDIP" for short. |
| 1735 | */ |
| 1736 | |
| 1737 | |
| 1738 | |
| 1739 | /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks |
| 1740 | * |
| 1741 | * R1) One and only one ASCONF Chunk MAY be in transit and |
| 1742 | * unacknowledged at any one time. If a sender, after sending |
| 1743 | * an ASCONF chunk, decides it needs to transfer another |
| 1744 | * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk |
| 1745 | * returns from the previous ASCONF Chunk before sending a |
| 1746 | * subsequent ASCONF. Note this restriction binds each side, |
| 1747 | * so at any time two ASCONF may be in-transit on any given |
| 1748 | * association (one sent from each endpoint). |
| 1749 | * |
| 1750 | * [This is our one-and-only-one ASCONF in flight. If we do |
| 1751 | * not have an ASCONF in flight, this is NULL.] |
| 1752 | */ |
| 1753 | struct sctp_chunk *addip_last_asconf; |
| 1754 | |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1755 | /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1756 | * |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1757 | * This is needed to implement itmes E1 - E4 of the updated |
| 1758 | * spec. Here is the justification: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | * |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1760 | * Since the peer may bundle multiple ASCONF chunks toward us, |
| 1761 | * we now need the ability to cache multiple ACKs. The section |
| 1762 | * describes in detail how they are cached and cleaned up. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | */ |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1764 | struct list_head asconf_ack_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1765 | |
| 1766 | /* These ASCONF chunks are waiting to be sent. |
| 1767 | * |
| 1768 | * These chunaks can't be pushed to outqueue until receiving |
| 1769 | * ASCONF_ACK for the previous ASCONF indicated by |
| 1770 | * addip_last_asconf, so as to guarantee that only one ASCONF |
| 1771 | * is in flight at any time. |
| 1772 | * |
| 1773 | * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks |
| 1774 | * |
| 1775 | * In defining the ASCONF Chunk transfer procedures, it is |
| 1776 | * essential that these transfers MUST NOT cause congestion |
| 1777 | * within the network. To achieve this, we place these |
| 1778 | * restrictions on the transfer of ASCONF Chunks: |
| 1779 | * |
| 1780 | * R1) One and only one ASCONF Chunk MAY be in transit and |
| 1781 | * unacknowledged at any one time. If a sender, after sending |
| 1782 | * an ASCONF chunk, decides it needs to transfer another |
| 1783 | * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk |
| 1784 | * returns from the previous ASCONF Chunk before sending a |
| 1785 | * subsequent ASCONF. Note this restriction binds each side, |
| 1786 | * so at any time two ASCONF may be in-transit on any given |
| 1787 | * association (one sent from each endpoint). |
| 1788 | * |
| 1789 | * |
| 1790 | * [I really think this is EXACTLY the sort of intelligence |
| 1791 | * which already resides in sctp_outq. Please move this |
| 1792 | * queue and its supporting logic down there. --piggy] |
| 1793 | */ |
David S. Miller | 79af02c | 2005-07-08 21:47:49 -0700 | [diff] [blame] | 1794 | struct list_head addip_chunk_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1795 | |
| 1796 | /* ADDIP Section 4.1 ASCONF Chunk Procedures |
| 1797 | * |
| 1798 | * A2) A serial number should be assigned to the Chunk. The |
| 1799 | * serial number SHOULD be a monotonically increasing |
| 1800 | * number. The serial number SHOULD be initialized at |
| 1801 | * the start of the association to the same value as the |
| 1802 | * Initial TSN and every time a new ASCONF chunk is created |
| 1803 | * it is incremented by one after assigning the serial number |
| 1804 | * to the newly created chunk. |
| 1805 | * |
| 1806 | * ADDIP |
| 1807 | * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) |
| 1808 | * |
| 1809 | * Serial Number : 32 bits (unsigned integer) |
| 1810 | * |
| 1811 | * This value represents a Serial Number for the ASCONF |
| 1812 | * Chunk. The valid range of Serial Number is from 0 to |
| 1813 | * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 |
| 1814 | * after reaching 4294967295. |
| 1815 | */ |
| 1816 | __u32 addip_serial; |
Michio Honda | 8a07eb0 | 2011-04-26 20:19:36 +0900 | [diff] [blame] | 1817 | int src_out_of_asoc_ok; |
wangweidong | be78cfc | 2013-12-13 13:51:04 +0800 | [diff] [blame] | 1818 | union sctp_addr *asconf_addr_del_pending; |
Michio Honda | 6af29cc | 2011-06-16 17:14:34 +0900 | [diff] [blame] | 1819 | struct sctp_transport *new_transport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1820 | |
Vlad Yasevich | 1f48564 | 2007-10-09 01:15:59 -0700 | [diff] [blame] | 1821 | /* SCTP AUTH: list of the endpoint shared keys. These |
| 1822 | * keys are provided out of band by the user applicaton |
| 1823 | * and can't change during the lifetime of the association |
| 1824 | */ |
| 1825 | struct list_head endpoint_shared_keys; |
| 1826 | |
| 1827 | /* SCTP AUTH: |
| 1828 | * The current generated assocaition shared key (secret) |
| 1829 | */ |
| 1830 | struct sctp_auth_bytes *asoc_shared_key; |
| 1831 | |
| 1832 | /* SCTP AUTH: hmac id of the first peer requested algorithm |
| 1833 | * that we support. |
| 1834 | */ |
| 1835 | __u16 default_hmac_id; |
| 1836 | |
| 1837 | __u16 active_key_id; |
| 1838 | |
Wei Yongjun | 9237ccb | 2009-09-04 14:33:19 +0800 | [diff] [blame] | 1839 | __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ |
| 1840 | temp:1; /* Is it a temporary association? */ |
Michele Baldessari | 196d675 | 2012-12-01 04:49:42 +0000 | [diff] [blame] | 1841 | |
| 1842 | struct sctp_priv_assoc_stats stats; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | }; |
| 1844 | |
| 1845 | |
| 1846 | /* An eyecatcher for determining if we are really looking at an |
| 1847 | * association data structure. |
| 1848 | */ |
| 1849 | enum { |
| 1850 | SCTP_ASSOC_EYECATCHER = 0xa550c123, |
| 1851 | }; |
| 1852 | |
| 1853 | /* Recover the outter association structure. */ |
| 1854 | static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) |
| 1855 | { |
| 1856 | struct sctp_association *asoc; |
| 1857 | |
| 1858 | asoc = container_of(base, struct sctp_association, base); |
| 1859 | return asoc; |
| 1860 | } |
| 1861 | |
| 1862 | /* These are function signatures for manipulating associations. */ |
| 1863 | |
| 1864 | |
| 1865 | struct sctp_association * |
| 1866 | sctp_association_new(const struct sctp_endpoint *, const struct sock *, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1867 | sctp_scope_t scope, gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1868 | void sctp_association_free(struct sctp_association *); |
| 1869 | void sctp_association_put(struct sctp_association *); |
| 1870 | void sctp_association_hold(struct sctp_association *); |
| 1871 | |
Wei Yongjun | 9919b45 | 2009-05-12 21:52:51 +0800 | [diff] [blame] | 1872 | struct sctp_transport *sctp_assoc_choose_alter_transport( |
| 1873 | struct sctp_association *, struct sctp_transport *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | void sctp_assoc_update_retran_path(struct sctp_association *); |
| 1875 | struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, |
| 1876 | const union sctp_addr *); |
| 1877 | int sctp_assoc_lookup_laddr(struct sctp_association *asoc, |
| 1878 | const union sctp_addr *laddr); |
| 1879 | struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, |
| 1880 | const union sctp_addr *address, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1881 | const gfp_t gfp, |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1882 | const int peer_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1883 | void sctp_assoc_del_peer(struct sctp_association *asoc, |
| 1884 | const union sctp_addr *addr); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1885 | void sctp_assoc_rm_peer(struct sctp_association *asoc, |
| 1886 | struct sctp_transport *peer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1887 | void sctp_assoc_control_transport(struct sctp_association *, |
| 1888 | struct sctp_transport *, |
| 1889 | sctp_transport_cmd_t, sctp_sn_error_t); |
| 1890 | struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); |
| 1891 | struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, |
Eric W. Biederman | 4110cc2 | 2012-08-06 08:41:13 +0000 | [diff] [blame] | 1892 | struct net *, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | const union sctp_addr *, |
| 1894 | const union sctp_addr *); |
| 1895 | void sctp_assoc_migrate(struct sctp_association *, struct sock *); |
| 1896 | void sctp_assoc_update(struct sctp_association *old, |
| 1897 | struct sctp_association *new); |
| 1898 | |
| 1899 | __u32 sctp_association_get_next_tsn(struct sctp_association *); |
| 1900 | |
David S. Miller | 02f3d4c | 2012-07-16 03:57:14 -0700 | [diff] [blame] | 1901 | void sctp_assoc_sync_pmtu(struct sock *, struct sctp_association *); |
Daniel Borkmann | 362d520 | 2014-04-14 21:45:17 +0200 | [diff] [blame] | 1902 | void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); |
| 1903 | void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | void sctp_assoc_set_primary(struct sctp_association *, |
| 1905 | struct sctp_transport *); |
Vlad Yasevich | 42e30bf | 2007-12-20 14:08:56 -0800 | [diff] [blame] | 1906 | void sctp_assoc_del_nonprimary_peers(struct sctp_association *, |
| 1907 | struct sctp_transport *); |
Alexey Dobriyan | 3182cd8 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 1908 | int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, |
Vlad Yasevich | 409b95a | 2009-11-10 08:57:34 +0000 | [diff] [blame] | 1909 | sctp_scope_t, gfp_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1910 | int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, |
Alexey Dobriyan | 3182cd8 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 1911 | struct sctp_cookie*, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1912 | gfp_t gfp); |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1913 | int sctp_assoc_set_id(struct sctp_association *, gfp_t); |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1914 | void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); |
| 1915 | struct sctp_chunk *sctp_assoc_lookup_asconf_ack( |
| 1916 | const struct sctp_association *asoc, |
| 1917 | __be32 serial); |
Wei Yongjun | a000c01 | 2011-05-29 23:23:36 +0000 | [diff] [blame] | 1918 | void sctp_asconf_queue_teardown(struct sctp_association *asoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1919 | |
| 1920 | int sctp_cmp_addr_exact(const union sctp_addr *ss1, |
| 1921 | const union sctp_addr *ss2); |
| 1922 | struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); |
| 1923 | |
| 1924 | /* A convenience structure to parse out SCTP specific CMSGs. */ |
| 1925 | typedef struct sctp_cmsgs { |
| 1926 | struct sctp_initmsg *init; |
Geir Ola Vaagland | 63b9493 | 2014-07-12 20:30:36 +0200 | [diff] [blame] | 1927 | struct sctp_sndrcvinfo *srinfo; |
| 1928 | struct sctp_sndinfo *sinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | } sctp_cmsgs_t; |
| 1930 | |
| 1931 | /* Structure for tracking memory objects */ |
| 1932 | typedef struct { |
| 1933 | char *label; |
| 1934 | atomic_t *counter; |
| 1935 | } sctp_dbg_objcnt_entry_t; |
| 1936 | |
| 1937 | #endif /* __sctp_structs_h__ */ |