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 | * |
| 9 | * These are definitions needed by the state machine. |
| 10 | * |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 11 | * This SCTP implementation is free software; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | * you can redistribute it and/or modify it under the terms of |
| 13 | * the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2, or (at your option) |
| 15 | * any later version. |
| 16 | * |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 17 | * This SCTP implementation is distributed in the hope that it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| 19 | * ************************ |
| 20 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 21 | * See the GNU General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License |
Jeff Kirsher | 4b2f13a | 2013-12-06 06:28:48 -0800 | [diff] [blame] | 24 | * along with GNU CC; see the file COPYING. If not, see |
| 25 | * <http://www.gnu.org/licenses/>. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | * |
| 27 | * Please send any bug reports or fixes you make to the |
| 28 | * email addresses: |
Daniel Borkmann | 91705c6 | 2013-07-23 14:51:47 +0200 | [diff] [blame] | 29 | * lksctp developers <linux-sctp@vger.kernel.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | * Written or modified by: |
| 32 | * La Monte H.P. Yarroll <piggy@acm.org> |
| 33 | * Karl Knutson <karl@athena.chicago.il.us> |
| 34 | * Xingang Guo <xingang.guo@intel.com> |
| 35 | * Jon Grimm <jgrimm@us.ibm.com> |
| 36 | * Dajiang Zhang <dajiang.zhang@nokia.com> |
| 37 | * Sridhar Samudrala <sri@us.ibm.com> |
| 38 | * Daisy Chang <daisyc@us.ibm.com> |
| 39 | * Ardelle Fan <ardelle.fan@intel.com> |
| 40 | * Kevin Gao <kevin.gao@intel.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | */ |
| 42 | |
| 43 | #include <linux/types.h> |
| 44 | #include <linux/compiler.h> |
| 45 | #include <linux/slab.h> |
| 46 | #include <linux/in.h> |
| 47 | #include <net/sctp/command.h> |
| 48 | #include <net/sctp/sctp.h> |
| 49 | |
| 50 | #ifndef __sctp_sm_h__ |
| 51 | #define __sctp_sm_h__ |
| 52 | |
| 53 | /* |
| 54 | * Possible values for the disposition are: |
| 55 | */ |
| 56 | typedef enum { |
| 57 | SCTP_DISPOSITION_DISCARD, /* No further processing. */ |
| 58 | SCTP_DISPOSITION_CONSUME, /* Process return values normally. */ |
| 59 | SCTP_DISPOSITION_NOMEM, /* We ran out of memory--recover. */ |
| 60 | SCTP_DISPOSITION_DELETE_TCB, /* Close the association. */ |
| 61 | SCTP_DISPOSITION_ABORT, /* Close the association NOW. */ |
| 62 | SCTP_DISPOSITION_VIOLATION, /* The peer is misbehaving. */ |
| 63 | SCTP_DISPOSITION_NOT_IMPL, /* This entry is not implemented. */ |
| 64 | SCTP_DISPOSITION_ERROR, /* This is plain old user error. */ |
| 65 | SCTP_DISPOSITION_BUG, /* This is a bug. */ |
| 66 | } sctp_disposition_t; |
| 67 | |
| 68 | typedef struct { |
| 69 | int name; |
| 70 | int action; |
| 71 | } sctp_sm_command_t; |
| 72 | |
Eric W. Biederman | 24cb81a | 2012-08-07 07:28:09 +0000 | [diff] [blame] | 73 | typedef sctp_disposition_t (sctp_state_fn_t) (struct net *, |
| 74 | const struct sctp_endpoint *, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | const struct sctp_association *, |
| 76 | const sctp_subtype_t type, |
| 77 | void *arg, |
| 78 | sctp_cmd_seq_t *); |
| 79 | typedef void (sctp_timer_event_t) (unsigned long); |
| 80 | typedef struct { |
| 81 | sctp_state_fn_t *fn; |
| 82 | const char *name; |
| 83 | } sctp_sm_table_entry_t; |
| 84 | |
| 85 | /* A naming convention of "sctp_sf_xxx" applies to all the state functions |
| 86 | * currently in use. |
| 87 | */ |
| 88 | |
| 89 | /* Prototypes for generic state functions. */ |
| 90 | sctp_state_fn_t sctp_sf_not_impl; |
| 91 | sctp_state_fn_t sctp_sf_bug; |
| 92 | |
| 93 | /* Prototypes for gener timer state functions. */ |
| 94 | sctp_state_fn_t sctp_sf_timer_ignore; |
| 95 | |
| 96 | /* Prototypes for chunk state functions. */ |
| 97 | sctp_state_fn_t sctp_sf_do_9_1_abort; |
| 98 | sctp_state_fn_t sctp_sf_cookie_wait_abort; |
| 99 | sctp_state_fn_t sctp_sf_cookie_echoed_abort; |
| 100 | sctp_state_fn_t sctp_sf_shutdown_pending_abort; |
| 101 | sctp_state_fn_t sctp_sf_shutdown_sent_abort; |
| 102 | sctp_state_fn_t sctp_sf_shutdown_ack_sent_abort; |
| 103 | sctp_state_fn_t sctp_sf_do_5_1B_init; |
| 104 | sctp_state_fn_t sctp_sf_do_5_1C_ack; |
| 105 | sctp_state_fn_t sctp_sf_do_5_1D_ce; |
| 106 | sctp_state_fn_t sctp_sf_do_5_1E_ca; |
| 107 | sctp_state_fn_t sctp_sf_do_4_C; |
| 108 | sctp_state_fn_t sctp_sf_eat_data_6_2; |
| 109 | sctp_state_fn_t sctp_sf_eat_data_fast_4_4; |
| 110 | sctp_state_fn_t sctp_sf_eat_sack_6_2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | sctp_state_fn_t sctp_sf_operr_notify; |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 112 | sctp_state_fn_t sctp_sf_t1_init_timer_expire; |
| 113 | sctp_state_fn_t sctp_sf_t1_cookie_timer_expire; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | sctp_state_fn_t sctp_sf_t2_timer_expire; |
| 115 | sctp_state_fn_t sctp_sf_t4_timer_expire; |
| 116 | sctp_state_fn_t sctp_sf_t5_timer_expire; |
| 117 | sctp_state_fn_t sctp_sf_sendbeat_8_3; |
| 118 | sctp_state_fn_t sctp_sf_beat_8_3; |
| 119 | sctp_state_fn_t sctp_sf_backbeat_8_3; |
| 120 | sctp_state_fn_t sctp_sf_do_9_2_final; |
| 121 | sctp_state_fn_t sctp_sf_do_9_2_shutdown; |
Wei Yongjun | 2e3f92d | 2008-10-23 01:01:18 -0700 | [diff] [blame] | 122 | sctp_state_fn_t sctp_sf_do_9_2_shut_ctsn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | sctp_state_fn_t sctp_sf_do_ecn_cwr; |
| 124 | sctp_state_fn_t sctp_sf_do_ecne; |
| 125 | sctp_state_fn_t sctp_sf_ootb; |
| 126 | sctp_state_fn_t sctp_sf_pdiscard; |
| 127 | sctp_state_fn_t sctp_sf_violation; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | sctp_state_fn_t sctp_sf_discard_chunk; |
| 129 | sctp_state_fn_t sctp_sf_do_5_2_1_siminit; |
| 130 | sctp_state_fn_t sctp_sf_do_5_2_2_dupinit; |
Vlad Yasevich | 610ab73 | 2007-01-15 19:18:30 -0800 | [diff] [blame] | 131 | sctp_state_fn_t sctp_sf_do_5_2_3_initack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | sctp_state_fn_t sctp_sf_do_5_2_4_dupcook; |
| 133 | sctp_state_fn_t sctp_sf_unk_chunk; |
| 134 | sctp_state_fn_t sctp_sf_do_8_5_1_E_sa; |
| 135 | sctp_state_fn_t sctp_sf_cookie_echoed_err; |
| 136 | sctp_state_fn_t sctp_sf_do_asconf; |
| 137 | sctp_state_fn_t sctp_sf_do_asconf_ack; |
| 138 | sctp_state_fn_t sctp_sf_do_9_2_reshutack; |
| 139 | sctp_state_fn_t sctp_sf_eat_fwd_tsn; |
| 140 | sctp_state_fn_t sctp_sf_eat_fwd_tsn_fast; |
Vlad Yasevich | bbd0d59 | 2007-10-03 17:51:34 -0700 | [diff] [blame] | 141 | sctp_state_fn_t sctp_sf_eat_auth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
| 143 | /* Prototypes for primitive event state functions. */ |
| 144 | sctp_state_fn_t sctp_sf_do_prm_asoc; |
| 145 | sctp_state_fn_t sctp_sf_do_prm_send; |
| 146 | sctp_state_fn_t sctp_sf_do_9_2_prm_shutdown; |
| 147 | sctp_state_fn_t sctp_sf_cookie_wait_prm_shutdown; |
| 148 | sctp_state_fn_t sctp_sf_cookie_echoed_prm_shutdown; |
| 149 | sctp_state_fn_t sctp_sf_do_9_1_prm_abort; |
| 150 | sctp_state_fn_t sctp_sf_cookie_wait_prm_abort; |
| 151 | sctp_state_fn_t sctp_sf_cookie_echoed_prm_abort; |
| 152 | sctp_state_fn_t sctp_sf_shutdown_pending_prm_abort; |
| 153 | sctp_state_fn_t sctp_sf_shutdown_sent_prm_abort; |
| 154 | sctp_state_fn_t sctp_sf_shutdown_ack_sent_prm_abort; |
| 155 | sctp_state_fn_t sctp_sf_error_closed; |
| 156 | sctp_state_fn_t sctp_sf_error_shutdown; |
| 157 | sctp_state_fn_t sctp_sf_ignore_primitive; |
| 158 | sctp_state_fn_t sctp_sf_do_prm_requestheartbeat; |
| 159 | sctp_state_fn_t sctp_sf_do_prm_asconf; |
| 160 | |
| 161 | /* Prototypes for other event state functions. */ |
Wei Yongjun | e1cdd55 | 2011-04-17 17:29:03 +0000 | [diff] [blame] | 162 | sctp_state_fn_t sctp_sf_do_no_pending_tsn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | sctp_state_fn_t sctp_sf_do_9_2_start_shutdown; |
| 164 | sctp_state_fn_t sctp_sf_do_9_2_shutdown_ack; |
| 165 | sctp_state_fn_t sctp_sf_ignore_other; |
| 166 | sctp_state_fn_t sctp_sf_cookie_wait_icmp_abort; |
| 167 | |
| 168 | /* Prototypes for timeout event state functions. */ |
| 169 | sctp_state_fn_t sctp_sf_do_6_3_3_rtx; |
| 170 | sctp_state_fn_t sctp_sf_do_6_2_sack; |
| 171 | sctp_state_fn_t sctp_sf_autoclose_timer_expire; |
| 172 | |
| 173 | /* Prototypes for utility support functions. */ |
| 174 | __u8 sctp_get_chunk_type(struct sctp_chunk *chunk); |
Eric W. Biederman | 55e26eb | 2012-08-07 07:25:24 +0000 | [diff] [blame] | 175 | const sctp_sm_table_entry_t *sctp_sm_lookup_event(struct net *, |
| 176 | sctp_event_t, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | sctp_state_t, |
| 178 | sctp_subtype_t); |
| 179 | int sctp_chunk_iif(const struct sctp_chunk *); |
| 180 | struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *, |
| 181 | struct sctp_chunk *, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 182 | gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | __u32 sctp_generate_verification_tag(void); |
| 184 | void sctp_populate_tie_tags(__u8 *cookie, __u32 curTag, __u32 hisTag); |
| 185 | |
| 186 | /* Prototypes for chunk-building functions. */ |
| 187 | struct sctp_chunk *sctp_make_init(const struct sctp_association *, |
| 188 | const struct sctp_bind_addr *, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 189 | gfp_t gfp, int vparam_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *, |
| 191 | const struct sctp_chunk *, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 192 | const gfp_t gfp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | const int unkparam_len); |
| 194 | struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *, |
| 195 | const struct sctp_chunk *); |
| 196 | struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *, |
| 197 | const struct sctp_chunk *); |
| 198 | struct sctp_chunk *sctp_make_cwr(const struct sctp_association *, |
| 199 | const __u32 lowest_tsn, |
| 200 | const struct sctp_chunk *); |
| 201 | struct sctp_chunk * sctp_make_datafrag_empty(struct sctp_association *, |
| 202 | const struct sctp_sndrcvinfo *sinfo, |
| 203 | int len, const __u8 flags, |
Marcelo Ricardo Leitner | cea8768 | 2016-03-10 18:33:07 -0300 | [diff] [blame] | 204 | __u16 ssn, gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | struct sctp_chunk *sctp_make_ecne(const struct sctp_association *, |
| 206 | const __u32); |
| 207 | struct sctp_chunk *sctp_make_sack(const struct sctp_association *); |
| 208 | struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, |
| 209 | const struct sctp_chunk *chunk); |
| 210 | struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, |
| 211 | const struct sctp_chunk *); |
| 212 | struct sctp_chunk *sctp_make_shutdown_complete(const struct sctp_association *, |
| 213 | const struct sctp_chunk *); |
Wei Yongjun | 00f1c2d | 2007-08-21 15:50:01 +0800 | [diff] [blame] | 214 | void sctp_init_cause(struct sctp_chunk *, __be16 cause, size_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | struct sctp_chunk *sctp_make_abort(const struct sctp_association *, |
| 216 | const struct sctp_chunk *, |
| 217 | const size_t hint); |
| 218 | struct sctp_chunk *sctp_make_abort_no_data(const struct sctp_association *, |
| 219 | const struct sctp_chunk *, |
| 220 | __u32 tsn); |
| 221 | struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *, |
Al Viro | 6ce8e9c | 2014-04-06 21:25:44 -0400 | [diff] [blame] | 222 | struct msghdr *, size_t msg_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | struct sctp_chunk *sctp_make_abort_violation(const struct sctp_association *, |
| 224 | const struct sctp_chunk *, |
| 225 | const __u8 *, |
| 226 | const size_t ); |
Wei Yongjun | ba01667 | 2008-09-30 05:32:24 -0700 | [diff] [blame] | 227 | struct sctp_chunk *sctp_make_violation_paramlen(const struct sctp_association *, |
| 228 | const struct sctp_chunk *, |
| 229 | struct sctp_paramhdr *); |
Neil Horman | de4594a | 2012-11-20 10:14:30 +0000 | [diff] [blame] | 230 | struct sctp_chunk *sctp_make_violation_max_retrans(const struct sctp_association *, |
| 231 | const struct sctp_chunk *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *, |
Wei Yongjun | 92c73af | 2011-04-19 21:31:47 +0000 | [diff] [blame] | 233 | const struct sctp_transport *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *, |
| 235 | const struct sctp_chunk *, |
| 236 | const void *payload, |
| 237 | const size_t paylen); |
| 238 | struct sctp_chunk *sctp_make_op_error(const struct sctp_association *, |
| 239 | const struct sctp_chunk *chunk, |
Al Viro | 63706c5 | 2006-11-20 17:00:05 -0800 | [diff] [blame] | 240 | __be16 cause_code, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | const void *payload, |
Vlad Yasevich | 6383cfb | 2009-11-23 15:53:56 -0500 | [diff] [blame] | 242 | size_t paylen, |
| 243 | size_t reserve_tail); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
| 245 | struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *, |
| 246 | union sctp_addr *, |
| 247 | struct sockaddr *, |
Al Viro | dbc16db | 2006-11-20 17:01:42 -0800 | [diff] [blame] | 248 | int, __be16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, |
| 250 | union sctp_addr *addr); |
Daniel Borkmann | 9de7922 | 2014-10-09 22:55:31 +0200 | [diff] [blame] | 251 | bool sctp_verify_asconf(const struct sctp_association *asoc, |
| 252 | struct sctp_chunk *chunk, bool addr_param_needed, |
| 253 | struct sctp_paramhdr **errp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, |
| 255 | struct sctp_chunk *asconf); |
| 256 | int sctp_process_asconf_ack(struct sctp_association *asoc, |
| 257 | struct sctp_chunk *asconf_ack); |
| 258 | struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, |
| 259 | __u32 new_cum_tsn, size_t nstreams, |
| 260 | struct sctp_fwdtsn_skip *skiplist); |
Vlad Yasevich | 4cd57c8 | 2007-09-16 19:32:45 -0700 | [diff] [blame] | 261 | struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc); |
Xin Long | cc16f00 | 2017-01-18 00:44:42 +0800 | [diff] [blame^] | 262 | struct sctp_chunk *sctp_make_strreset_req( |
| 263 | const struct sctp_association *asoc, |
| 264 | __u16 stream_num, __u16 *stream_list, |
| 265 | bool out, bool in); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | void sctp_chunk_assign_tsn(struct sctp_chunk *); |
| 267 | void sctp_chunk_assign_ssn(struct sctp_chunk *); |
| 268 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | /* Prototypes for statetable processing. */ |
| 270 | |
Eric W. Biederman | 55e26eb | 2012-08-07 07:25:24 +0000 | [diff] [blame] | 271 | int sctp_do_sm(struct net *net, sctp_event_t event_type, sctp_subtype_t subtype, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | sctp_state_t state, |
| 273 | struct sctp_endpoint *, |
| 274 | struct sctp_association *asoc, |
| 275 | void *event_arg, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 276 | gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | |
| 278 | /* 2nd level prototypes */ |
| 279 | void sctp_generate_t3_rtx_event(unsigned long peer); |
| 280 | void sctp_generate_heartbeat_event(unsigned long peer); |
Vlad Yasevich | 50b5d6a | 2010-05-06 00:56:07 -0700 | [diff] [blame] | 281 | void sctp_generate_proto_unreach_event(unsigned long peer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
| 283 | void sctp_ootb_pkt_free(struct sctp_packet *); |
| 284 | |
| 285 | struct sctp_association *sctp_unpack_cookie(const struct sctp_endpoint *, |
| 286 | const struct sctp_association *, |
Alexey Dobriyan | 3182cd8 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 287 | struct sctp_chunk *, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 288 | gfp_t gfp, int *err, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | struct sctp_chunk **err_chk_p); |
| 290 | int sctp_addip_addr_config(struct sctp_association *, sctp_param_t, |
| 291 | struct sockaddr_storage*, int); |
| 292 | |
| 293 | /* 3rd level prototypes */ |
| 294 | __u32 sctp_generate_tag(const struct sctp_endpoint *); |
| 295 | __u32 sctp_generate_tsn(const struct sctp_endpoint *); |
| 296 | |
| 297 | /* Extern declarations for major data structures. */ |
| 298 | extern sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES]; |
| 299 | |
| 300 | |
| 301 | /* Get the size of a DATA chunk payload. */ |
| 302 | static inline __u16 sctp_data_size(struct sctp_chunk *chunk) |
| 303 | { |
| 304 | __u16 size; |
| 305 | |
| 306 | size = ntohs(chunk->chunk_hdr->length); |
| 307 | size -= sizeof(sctp_data_chunk_t); |
| 308 | |
| 309 | return size; |
| 310 | } |
| 311 | |
| 312 | /* Compare two TSNs */ |
Marcelo Ricardo Leitner | 182691d | 2016-09-20 18:19:14 -0300 | [diff] [blame] | 313 | #define TSN_lt(a,b) \ |
| 314 | (typecheck(__u32, a) && \ |
| 315 | typecheck(__u32, b) && \ |
| 316 | ((__s32)((a) - (b)) < 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | |
Marcelo Ricardo Leitner | 182691d | 2016-09-20 18:19:14 -0300 | [diff] [blame] | 318 | #define TSN_lte(a,b) \ |
| 319 | (typecheck(__u32, a) && \ |
| 320 | typecheck(__u32, b) && \ |
| 321 | ((__s32)((a) - (b)) <= 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
| 323 | /* Compare two SSNs */ |
Marcelo Ricardo Leitner | 182691d | 2016-09-20 18:19:14 -0300 | [diff] [blame] | 324 | #define SSN_lt(a,b) \ |
| 325 | (typecheck(__u16, a) && \ |
| 326 | typecheck(__u16, b) && \ |
| 327 | ((__s16)((a) - (b)) < 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | |
Marcelo Ricardo Leitner | 182691d | 2016-09-20 18:19:14 -0300 | [diff] [blame] | 329 | /* ADDIP 3.1.1 */ |
| 330 | #define ADDIP_SERIAL_gte(a,b) \ |
| 331 | (typecheck(__u32, a) && \ |
| 332 | typecheck(__u32, b) && \ |
| 333 | ((__s32)((b) - (a)) <= 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | /* Check VTAG of the packet matches the sender's own tag. */ |
| 336 | static inline int |
| 337 | sctp_vtag_verify(const struct sctp_chunk *chunk, |
| 338 | const struct sctp_association *asoc) |
| 339 | { |
| 340 | /* RFC 2960 Sec 8.5 When receiving an SCTP packet, the endpoint |
| 341 | * MUST ensure that the value in the Verification Tag field of |
| 342 | * the received SCTP packet matches its own Tag. If the received |
| 343 | * Verification Tag value does not match the receiver's own |
| 344 | * tag value, the receiver shall silently discard the packet... |
| 345 | */ |
| 346 | if (ntohl(chunk->sctp_hdr->vtag) == asoc->c.my_vtag) |
| 347 | return 1; |
| 348 | |
| 349 | return 0; |
| 350 | } |
| 351 | |
Jerome Forissier | 047a242 | 2005-04-28 11:58:43 -0700 | [diff] [blame] | 352 | /* Check VTAG of the packet matches the sender's own tag and the T bit is |
| 353 | * not set, OR its peer's tag and the T bit is set in the Chunk Flags. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | */ |
| 355 | static inline int |
| 356 | sctp_vtag_verify_either(const struct sctp_chunk *chunk, |
| 357 | const struct sctp_association *asoc) |
| 358 | { |
Jerome Forissier | 047a242 | 2005-04-28 11:58:43 -0700 | [diff] [blame] | 359 | /* RFC 2960 Section 8.5.1, sctpimpguide Section 2.41 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | * |
Jerome Forissier | 047a242 | 2005-04-28 11:58:43 -0700 | [diff] [blame] | 361 | * B) The receiver of a ABORT MUST accept the packet |
| 362 | * if the Verification Tag field of the packet matches its own tag |
| 363 | * and the T bit is not set |
| 364 | * OR |
| 365 | * it is set to its peer's tag and the T bit is set in the Chunk |
| 366 | * Flags. |
| 367 | * Otherwise, the receiver MUST silently discard the packet |
| 368 | * and take no further action. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | * |
Jerome Forissier | 047a242 | 2005-04-28 11:58:43 -0700 | [diff] [blame] | 370 | * C) The receiver of a SHUTDOWN COMPLETE shall accept the packet |
| 371 | * if the Verification Tag field of the packet matches its own tag |
| 372 | * and the T bit is not set |
| 373 | * OR |
| 374 | * it is set to its peer's tag and the T bit is set in the Chunk |
| 375 | * Flags. |
| 376 | * Otherwise, the receiver MUST silently discard the packet |
| 377 | * and take no further action. An endpoint MUST ignore the |
| 378 | * SHUTDOWN COMPLETE if it is not in the SHUTDOWN-ACK-SENT state. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | */ |
Jerome Forissier | 047a242 | 2005-04-28 11:58:43 -0700 | [diff] [blame] | 380 | if ((!sctp_test_T_bit(chunk) && |
| 381 | (ntohl(chunk->sctp_hdr->vtag) == asoc->c.my_vtag)) || |
Wei Yongjun | 52688d6 | 2010-04-30 21:42:44 -0400 | [diff] [blame] | 382 | (sctp_test_T_bit(chunk) && asoc->c.peer_vtag && |
Jerome Forissier | 047a242 | 2005-04-28 11:58:43 -0700 | [diff] [blame] | 383 | (ntohl(chunk->sctp_hdr->vtag) == asoc->c.peer_vtag))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | return 1; |
| 385 | } |
| 386 | |
| 387 | return 0; |
| 388 | } |
| 389 | |
| 390 | #endif /* __sctp_sm_h__ */ |