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 | * Copyright (c) 2001 Nokia, Inc. |
| 7 | * Copyright (c) 2001 La Monte H.P. Yarroll |
| 8 | * |
| 9 | * These functions manipulate an sctp event. The struct ulpevent is used |
| 10 | * to carry notifications and data to the ULP (sockets). |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 11 | * |
| 12 | * This SCTP implementation is free software; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * you can redistribute it and/or modify it under the terms of |
| 14 | * the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2, or (at your option) |
| 16 | * any later version. |
| 17 | * |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 18 | * This SCTP implementation is distributed in the hope that it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| 20 | * ************************ |
| 21 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 22 | * See the GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with GNU CC; see the file COPYING. If not, write to |
| 26 | * the Free Software Foundation, 59 Temple Place - Suite 330, |
| 27 | * Boston, MA 02111-1307, USA. |
| 28 | * |
| 29 | * Please send any bug reports or fixes you make to the |
| 30 | * email address(es): |
Daniel Borkmann | 91705c6 | 2013-07-23 14:51:47 +0200 | [diff] [blame] | 31 | * lksctp developers <linux-sctp@vger.kernel.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | * Written or modified by: |
| 34 | * Jon Grimm <jgrimm@us.ibm.com> |
| 35 | * La Monte H.P. Yarroll <piggy@acm.org> |
| 36 | * Ardelle Fan <ardelle.fan@intel.com> |
| 37 | * Sridhar Samudrala <sri@us.ibm.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | */ |
| 39 | |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 40 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <linux/types.h> |
| 42 | #include <linux/skbuff.h> |
| 43 | #include <net/sctp/structs.h> |
| 44 | #include <net/sctp/sctp.h> |
| 45 | #include <net/sctp/sm.h> |
| 46 | |
| 47 | static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, |
| 48 | struct sctp_association *asoc); |
| 49 | static void sctp_ulpevent_release_data(struct sctp_ulpevent *event); |
Tsutomu Fujii | d7c2c9e | 2006-06-17 22:58:28 -0700 | [diff] [blame] | 50 | static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event); |
| 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | /* Initialize an ULP event from an given skb. */ |
Daniel Borkmann | dda9192 | 2013-06-17 11:40:05 +0200 | [diff] [blame] | 54 | static void sctp_ulpevent_init(struct sctp_ulpevent *event, |
| 55 | int msg_flags, |
| 56 | unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | { |
| 58 | memset(event, 0, sizeof(struct sctp_ulpevent)); |
| 59 | event->msg_flags = msg_flags; |
Vlad Yasevich | 331c4ee | 2006-10-09 21:34:04 -0700 | [diff] [blame] | 60 | event->rmem_len = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | } |
| 62 | |
| 63 | /* Create a new sctp_ulpevent. */ |
Daniel Borkmann | dda9192 | 2013-06-17 11:40:05 +0200 | [diff] [blame] | 64 | static struct sctp_ulpevent *sctp_ulpevent_new(int size, int msg_flags, |
| 65 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | { |
| 67 | struct sctp_ulpevent *event; |
| 68 | struct sk_buff *skb; |
| 69 | |
| 70 | skb = alloc_skb(size, gfp); |
| 71 | if (!skb) |
| 72 | goto fail; |
| 73 | |
| 74 | event = sctp_skb2event(skb); |
Vlad Yasevich | 331c4ee | 2006-10-09 21:34:04 -0700 | [diff] [blame] | 75 | sctp_ulpevent_init(event, msg_flags, skb->truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 77 | return event; |
| 78 | |
| 79 | fail: |
| 80 | return NULL; |
| 81 | } |
| 82 | |
| 83 | /* Is this a MSG_NOTIFICATION? */ |
| 84 | int sctp_ulpevent_is_notification(const struct sctp_ulpevent *event) |
| 85 | { |
| 86 | return MSG_NOTIFICATION == (event->msg_flags & MSG_NOTIFICATION); |
| 87 | } |
| 88 | |
| 89 | /* Hold the association in case the msg_name needs read out of |
| 90 | * the association. |
| 91 | */ |
| 92 | static inline void sctp_ulpevent_set_owner(struct sctp_ulpevent *event, |
| 93 | const struct sctp_association *asoc) |
| 94 | { |
| 95 | struct sk_buff *skb; |
| 96 | |
| 97 | /* Cast away the const, as we are just wanting to |
| 98 | * bump the reference count. |
| 99 | */ |
| 100 | sctp_association_hold((struct sctp_association *)asoc); |
| 101 | skb = sctp_event2skb(event); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | event->asoc = (struct sctp_association *)asoc; |
Vlad Yasevich | 331c4ee | 2006-10-09 21:34:04 -0700 | [diff] [blame] | 103 | atomic_add(event->rmem_len, &event->asoc->rmem_alloc); |
| 104 | sctp_skb_set_owner_r(skb, asoc->base.sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } |
| 106 | |
| 107 | /* A simple destructor to give up the reference to the association. */ |
| 108 | static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event) |
| 109 | { |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 110 | struct sctp_association *asoc = event->asoc; |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 111 | |
Vlad Yasevich | 331c4ee | 2006-10-09 21:34:04 -0700 | [diff] [blame] | 112 | atomic_sub(event->rmem_len, &asoc->rmem_alloc); |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 113 | sctp_association_put(asoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | /* Create and initialize an SCTP_ASSOC_CHANGE event. |
| 117 | * |
| 118 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 119 | * |
| 120 | * Communication notifications inform the ULP that an SCTP association |
| 121 | * has either begun or ended. The identifier for a new association is |
| 122 | * provided by this notification. |
| 123 | * |
| 124 | * Note: There is no field checking here. If a field is unused it will be |
| 125 | * zero'd out. |
| 126 | */ |
| 127 | struct sctp_ulpevent *sctp_ulpevent_make_assoc_change( |
| 128 | const struct sctp_association *asoc, |
| 129 | __u16 flags, __u16 state, __u16 error, __u16 outbound, |
Vlad Yasevich | a5a35e7 | 2007-03-23 11:34:08 -0700 | [diff] [blame] | 130 | __u16 inbound, struct sctp_chunk *chunk, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | { |
| 132 | struct sctp_ulpevent *event; |
| 133 | struct sctp_assoc_change *sac; |
| 134 | struct sk_buff *skb; |
| 135 | |
Vlad Yasevich | a5a35e7 | 2007-03-23 11:34:08 -0700 | [diff] [blame] | 136 | /* If the lower layer passed in the chunk, it will be |
| 137 | * an ABORT, so we need to include it in the sac_info. |
| 138 | */ |
| 139 | if (chunk) { |
Vlad Yasevich | a5a35e7 | 2007-03-23 11:34:08 -0700 | [diff] [blame] | 140 | /* Copy the chunk data to a new skb and reserve enough |
| 141 | * head room to use as notification. |
| 142 | */ |
| 143 | skb = skb_copy_expand(chunk->skb, |
| 144 | sizeof(struct sctp_assoc_change), 0, gfp); |
| 145 | |
| 146 | if (!skb) |
| 147 | goto fail; |
| 148 | |
Vlad Yasevich | a5a35e7 | 2007-03-23 11:34:08 -0700 | [diff] [blame] | 149 | /* Embed the event fields inside the cloned skb. */ |
| 150 | event = sctp_skb2event(skb); |
| 151 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
| 152 | |
| 153 | /* Include the notification structure */ |
| 154 | sac = (struct sctp_assoc_change *) |
| 155 | skb_push(skb, sizeof(struct sctp_assoc_change)); |
| 156 | |
| 157 | /* Trim the buffer to the right length. */ |
| 158 | skb_trim(skb, sizeof(struct sctp_assoc_change) + |
Vlad Yasevich | ac40e41 | 2007-05-09 13:52:35 -0700 | [diff] [blame] | 159 | ntohs(chunk->chunk_hdr->length) - |
| 160 | sizeof(sctp_chunkhdr_t)); |
Vlad Yasevich | a5a35e7 | 2007-03-23 11:34:08 -0700 | [diff] [blame] | 161 | } else { |
| 162 | event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | MSG_NOTIFICATION, gfp); |
Vlad Yasevich | a5a35e7 | 2007-03-23 11:34:08 -0700 | [diff] [blame] | 164 | if (!event) |
| 165 | goto fail; |
| 166 | |
| 167 | skb = sctp_event2skb(event); |
| 168 | sac = (struct sctp_assoc_change *) skb_put(skb, |
| 169 | sizeof(struct sctp_assoc_change)); |
| 170 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | |
| 172 | /* Socket Extensions for SCTP |
| 173 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 174 | * |
| 175 | * sac_type: |
| 176 | * It should be SCTP_ASSOC_CHANGE. |
| 177 | */ |
| 178 | sac->sac_type = SCTP_ASSOC_CHANGE; |
| 179 | |
| 180 | /* Socket Extensions for SCTP |
| 181 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 182 | * |
| 183 | * sac_state: 32 bits (signed integer) |
| 184 | * This field holds one of a number of values that communicate the |
| 185 | * event that happened to the association. |
| 186 | */ |
| 187 | sac->sac_state = state; |
| 188 | |
| 189 | /* Socket Extensions for SCTP |
| 190 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 191 | * |
| 192 | * sac_flags: 16 bits (unsigned integer) |
| 193 | * Currently unused. |
| 194 | */ |
| 195 | sac->sac_flags = 0; |
| 196 | |
| 197 | /* Socket Extensions for SCTP |
| 198 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 199 | * |
| 200 | * sac_length: sizeof (__u32) |
| 201 | * This field is the total length of the notification data, including |
| 202 | * the notification header. |
| 203 | */ |
Vlad Yasevich | b90a137 | 2008-02-14 10:18:20 -0500 | [diff] [blame] | 204 | sac->sac_length = skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
| 206 | /* Socket Extensions for SCTP |
| 207 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 208 | * |
| 209 | * sac_error: 32 bits (signed integer) |
| 210 | * |
| 211 | * If the state was reached due to a error condition (e.g. |
| 212 | * COMMUNICATION_LOST) any relevant error information is available in |
| 213 | * this field. This corresponds to the protocol error codes defined in |
| 214 | * [SCTP]. |
| 215 | */ |
| 216 | sac->sac_error = error; |
| 217 | |
| 218 | /* Socket Extensions for SCTP |
| 219 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 220 | * |
| 221 | * sac_outbound_streams: 16 bits (unsigned integer) |
| 222 | * sac_inbound_streams: 16 bits (unsigned integer) |
| 223 | * |
| 224 | * The maximum number of streams allowed in each direction are |
| 225 | * available in sac_outbound_streams and sac_inbound streams. |
| 226 | */ |
| 227 | sac->sac_outbound_streams = outbound; |
| 228 | sac->sac_inbound_streams = inbound; |
| 229 | |
| 230 | /* Socket Extensions for SCTP |
| 231 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 232 | * |
| 233 | * sac_assoc_id: sizeof (sctp_assoc_t) |
| 234 | * |
| 235 | * The association id field, holds the identifier for the association. |
| 236 | * All notifications for a given association have the same association |
| 237 | * identifier. For TCP style socket, this field is ignored. |
| 238 | */ |
| 239 | sctp_ulpevent_set_owner(event, asoc); |
| 240 | sac->sac_assoc_id = sctp_assoc2id(asoc); |
| 241 | |
| 242 | return event; |
| 243 | |
| 244 | fail: |
| 245 | return NULL; |
| 246 | } |
| 247 | |
| 248 | /* Create and initialize an SCTP_PEER_ADDR_CHANGE event. |
| 249 | * |
| 250 | * Socket Extensions for SCTP - draft-01 |
| 251 | * 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| 252 | * |
| 253 | * When a destination address on a multi-homed peer encounters a change |
| 254 | * an interface details event is sent. |
| 255 | */ |
| 256 | struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change( |
| 257 | const struct sctp_association *asoc, |
| 258 | const struct sockaddr_storage *aaddr, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 259 | int flags, int state, int error, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | { |
| 261 | struct sctp_ulpevent *event; |
| 262 | struct sctp_paddr_change *spc; |
| 263 | struct sk_buff *skb; |
| 264 | |
| 265 | event = sctp_ulpevent_new(sizeof(struct sctp_paddr_change), |
| 266 | MSG_NOTIFICATION, gfp); |
| 267 | if (!event) |
| 268 | goto fail; |
| 269 | |
| 270 | skb = sctp_event2skb(event); |
| 271 | spc = (struct sctp_paddr_change *) |
| 272 | skb_put(skb, sizeof(struct sctp_paddr_change)); |
| 273 | |
| 274 | /* Sockets API Extensions for SCTP |
| 275 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| 276 | * |
| 277 | * spc_type: |
| 278 | * |
| 279 | * It should be SCTP_PEER_ADDR_CHANGE. |
| 280 | */ |
| 281 | spc->spc_type = SCTP_PEER_ADDR_CHANGE; |
| 282 | |
| 283 | /* Sockets API Extensions for SCTP |
| 284 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| 285 | * |
| 286 | * spc_length: sizeof (__u32) |
| 287 | * |
| 288 | * This field is the total length of the notification data, including |
| 289 | * the notification header. |
| 290 | */ |
| 291 | spc->spc_length = sizeof(struct sctp_paddr_change); |
| 292 | |
| 293 | /* Sockets API Extensions for SCTP |
| 294 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| 295 | * |
| 296 | * spc_flags: 16 bits (unsigned integer) |
| 297 | * Currently unused. |
| 298 | */ |
| 299 | spc->spc_flags = 0; |
| 300 | |
| 301 | /* Sockets API Extensions for SCTP |
| 302 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| 303 | * |
| 304 | * spc_state: 32 bits (signed integer) |
| 305 | * |
| 306 | * This field holds one of a number of values that communicate the |
| 307 | * event that happened to the address. |
| 308 | */ |
| 309 | spc->spc_state = state; |
| 310 | |
| 311 | /* Sockets API Extensions for SCTP |
| 312 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| 313 | * |
| 314 | * spc_error: 32 bits (signed integer) |
| 315 | * |
| 316 | * If the state was reached due to any error condition (e.g. |
| 317 | * ADDRESS_UNREACHABLE) any relevant error information is available in |
| 318 | * this field. |
| 319 | */ |
| 320 | spc->spc_error = error; |
| 321 | |
| 322 | /* Socket Extensions for SCTP |
| 323 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 324 | * |
| 325 | * spc_assoc_id: sizeof (sctp_assoc_t) |
| 326 | * |
| 327 | * The association id field, holds the identifier for the association. |
| 328 | * All notifications for a given association have the same association |
| 329 | * identifier. For TCP style socket, this field is ignored. |
| 330 | */ |
| 331 | sctp_ulpevent_set_owner(event, asoc); |
| 332 | spc->spc_assoc_id = sctp_assoc2id(asoc); |
| 333 | |
| 334 | /* Sockets API Extensions for SCTP |
| 335 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| 336 | * |
| 337 | * spc_aaddr: sizeof (struct sockaddr_storage) |
| 338 | * |
| 339 | * The affected address field, holds the remote peer's address that is |
| 340 | * encountering the change of state. |
| 341 | */ |
| 342 | memcpy(&spc->spc_aaddr, aaddr, sizeof(struct sockaddr_storage)); |
| 343 | |
| 344 | /* Map ipv4 address into v4-mapped-on-v6 address. */ |
| 345 | sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_v4map( |
| 346 | sctp_sk(asoc->base.sk), |
| 347 | (union sctp_addr *)&spc->spc_aaddr); |
| 348 | |
| 349 | return event; |
| 350 | |
| 351 | fail: |
| 352 | return NULL; |
| 353 | } |
| 354 | |
| 355 | /* Create and initialize an SCTP_REMOTE_ERROR notification. |
| 356 | * |
| 357 | * Note: This assumes that the chunk->skb->data already points to the |
| 358 | * operation error payload. |
| 359 | * |
| 360 | * Socket Extensions for SCTP - draft-01 |
| 361 | * 5.3.1.3 SCTP_REMOTE_ERROR |
| 362 | * |
| 363 | * A remote peer may send an Operational Error message to its peer. |
| 364 | * This message indicates a variety of error conditions on an |
| 365 | * association. The entire error TLV as it appears on the wire is |
| 366 | * included in a SCTP_REMOTE_ERROR event. Please refer to the SCTP |
| 367 | * specification [SCTP] and any extensions for a list of possible |
| 368 | * error formats. |
| 369 | */ |
| 370 | struct sctp_ulpevent *sctp_ulpevent_make_remote_error( |
| 371 | const struct sctp_association *asoc, struct sctp_chunk *chunk, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 372 | __u16 flags, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | { |
| 374 | struct sctp_ulpevent *event; |
| 375 | struct sctp_remote_error *sre; |
| 376 | struct sk_buff *skb; |
| 377 | sctp_errhdr_t *ch; |
Al Viro | 9f81bcd | 2006-11-20 17:26:34 -0800 | [diff] [blame] | 378 | __be16 cause; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | int elen; |
| 380 | |
| 381 | ch = (sctp_errhdr_t *)(chunk->skb->data); |
| 382 | cause = ch->cause; |
| 383 | elen = WORD_ROUND(ntohs(ch->length)) - sizeof(sctp_errhdr_t); |
| 384 | |
| 385 | /* Pull off the ERROR header. */ |
| 386 | skb_pull(chunk->skb, sizeof(sctp_errhdr_t)); |
| 387 | |
| 388 | /* Copy the skb to a new skb with room for us to prepend |
| 389 | * notification with. |
| 390 | */ |
| 391 | skb = skb_copy_expand(chunk->skb, sizeof(struct sctp_remote_error), |
| 392 | 0, gfp); |
| 393 | |
| 394 | /* Pull off the rest of the cause TLV from the chunk. */ |
| 395 | skb_pull(chunk->skb, elen); |
| 396 | if (!skb) |
| 397 | goto fail; |
| 398 | |
| 399 | /* Embed the event fields inside the cloned skb. */ |
| 400 | event = sctp_skb2event(skb); |
Vlad Yasevich | 331c4ee | 2006-10-09 21:34:04 -0700 | [diff] [blame] | 401 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
| 403 | sre = (struct sctp_remote_error *) |
| 404 | skb_push(skb, sizeof(struct sctp_remote_error)); |
| 405 | |
| 406 | /* Trim the buffer to the right length. */ |
| 407 | skb_trim(skb, sizeof(struct sctp_remote_error) + elen); |
| 408 | |
| 409 | /* Socket Extensions for SCTP |
| 410 | * 5.3.1.3 SCTP_REMOTE_ERROR |
| 411 | * |
| 412 | * sre_type: |
| 413 | * It should be SCTP_REMOTE_ERROR. |
| 414 | */ |
| 415 | sre->sre_type = SCTP_REMOTE_ERROR; |
| 416 | |
| 417 | /* |
| 418 | * Socket Extensions for SCTP |
| 419 | * 5.3.1.3 SCTP_REMOTE_ERROR |
| 420 | * |
| 421 | * sre_flags: 16 bits (unsigned integer) |
| 422 | * Currently unused. |
| 423 | */ |
| 424 | sre->sre_flags = 0; |
| 425 | |
| 426 | /* Socket Extensions for SCTP |
| 427 | * 5.3.1.3 SCTP_REMOTE_ERROR |
| 428 | * |
| 429 | * sre_length: sizeof (__u32) |
| 430 | * |
| 431 | * This field is the total length of the notification data, |
| 432 | * including the notification header. |
| 433 | */ |
| 434 | sre->sre_length = skb->len; |
| 435 | |
| 436 | /* Socket Extensions for SCTP |
| 437 | * 5.3.1.3 SCTP_REMOTE_ERROR |
| 438 | * |
| 439 | * sre_error: 16 bits (unsigned integer) |
| 440 | * This value represents one of the Operational Error causes defined in |
| 441 | * the SCTP specification, in network byte order. |
| 442 | */ |
| 443 | sre->sre_error = cause; |
| 444 | |
| 445 | /* Socket Extensions for SCTP |
| 446 | * 5.3.1.3 SCTP_REMOTE_ERROR |
| 447 | * |
| 448 | * sre_assoc_id: sizeof (sctp_assoc_t) |
| 449 | * |
| 450 | * The association id field, holds the identifier for the association. |
| 451 | * All notifications for a given association have the same association |
| 452 | * identifier. For TCP style socket, this field is ignored. |
| 453 | */ |
| 454 | sctp_ulpevent_set_owner(event, asoc); |
| 455 | sre->sre_assoc_id = sctp_assoc2id(asoc); |
| 456 | |
| 457 | return event; |
| 458 | |
| 459 | fail: |
| 460 | return NULL; |
| 461 | } |
| 462 | |
| 463 | /* Create and initialize a SCTP_SEND_FAILED notification. |
| 464 | * |
| 465 | * Socket Extensions for SCTP - draft-01 |
| 466 | * 5.3.1.4 SCTP_SEND_FAILED |
| 467 | */ |
| 468 | struct sctp_ulpevent *sctp_ulpevent_make_send_failed( |
| 469 | const struct sctp_association *asoc, struct sctp_chunk *chunk, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 470 | __u16 flags, __u32 error, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | { |
| 472 | struct sctp_ulpevent *event; |
| 473 | struct sctp_send_failed *ssf; |
| 474 | struct sk_buff *skb; |
| 475 | |
| 476 | /* Pull off any padding. */ |
| 477 | int len = ntohs(chunk->chunk_hdr->length); |
| 478 | |
| 479 | /* Make skb with more room so we can prepend notification. */ |
| 480 | skb = skb_copy_expand(chunk->skb, |
| 481 | sizeof(struct sctp_send_failed), /* headroom */ |
| 482 | 0, /* tailroom */ |
| 483 | gfp); |
| 484 | if (!skb) |
| 485 | goto fail; |
| 486 | |
| 487 | /* Pull off the common chunk header and DATA header. */ |
| 488 | skb_pull(skb, sizeof(struct sctp_data_chunk)); |
| 489 | len -= sizeof(struct sctp_data_chunk); |
| 490 | |
| 491 | /* Embed the event fields inside the cloned skb. */ |
| 492 | event = sctp_skb2event(skb); |
Vlad Yasevich | 331c4ee | 2006-10-09 21:34:04 -0700 | [diff] [blame] | 493 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
| 495 | ssf = (struct sctp_send_failed *) |
| 496 | skb_push(skb, sizeof(struct sctp_send_failed)); |
| 497 | |
| 498 | /* Socket Extensions for SCTP |
| 499 | * 5.3.1.4 SCTP_SEND_FAILED |
| 500 | * |
| 501 | * ssf_type: |
| 502 | * It should be SCTP_SEND_FAILED. |
| 503 | */ |
| 504 | ssf->ssf_type = SCTP_SEND_FAILED; |
| 505 | |
| 506 | /* Socket Extensions for SCTP |
| 507 | * 5.3.1.4 SCTP_SEND_FAILED |
| 508 | * |
| 509 | * ssf_flags: 16 bits (unsigned integer) |
| 510 | * The flag value will take one of the following values |
| 511 | * |
| 512 | * SCTP_DATA_UNSENT - Indicates that the data was never put on |
| 513 | * the wire. |
| 514 | * |
| 515 | * SCTP_DATA_SENT - Indicates that the data was put on the wire. |
| 516 | * Note that this does not necessarily mean that the |
| 517 | * data was (or was not) successfully delivered. |
| 518 | */ |
| 519 | ssf->ssf_flags = flags; |
| 520 | |
| 521 | /* Socket Extensions for SCTP |
| 522 | * 5.3.1.4 SCTP_SEND_FAILED |
| 523 | * |
| 524 | * ssf_length: sizeof (__u32) |
| 525 | * This field is the total length of the notification data, including |
| 526 | * the notification header. |
| 527 | */ |
| 528 | ssf->ssf_length = sizeof(struct sctp_send_failed) + len; |
| 529 | skb_trim(skb, ssf->ssf_length); |
| 530 | |
| 531 | /* Socket Extensions for SCTP |
| 532 | * 5.3.1.4 SCTP_SEND_FAILED |
| 533 | * |
| 534 | * ssf_error: 16 bits (unsigned integer) |
| 535 | * This value represents the reason why the send failed, and if set, |
| 536 | * will be a SCTP protocol error code as defined in [SCTP] section |
| 537 | * 3.3.10. |
| 538 | */ |
| 539 | ssf->ssf_error = error; |
| 540 | |
| 541 | /* Socket Extensions for SCTP |
| 542 | * 5.3.1.4 SCTP_SEND_FAILED |
| 543 | * |
| 544 | * ssf_info: sizeof (struct sctp_sndrcvinfo) |
| 545 | * The original send information associated with the undelivered |
| 546 | * message. |
| 547 | */ |
| 548 | memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo)); |
| 549 | |
| 550 | /* Per TSVWG discussion with Randy. Allow the application to |
Lucas De Marchi | e9c5499 | 2011-04-26 23:28:26 -0700 | [diff] [blame] | 551 | * reassemble a fragmented message. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | */ |
| 553 | ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags; |
| 554 | |
| 555 | /* Socket Extensions for SCTP |
| 556 | * 5.3.1.4 SCTP_SEND_FAILED |
| 557 | * |
| 558 | * ssf_assoc_id: sizeof (sctp_assoc_t) |
| 559 | * The association id field, sf_assoc_id, holds the identifier for the |
| 560 | * association. All notifications for a given association have the |
| 561 | * same association identifier. For TCP style socket, this field is |
| 562 | * ignored. |
| 563 | */ |
| 564 | sctp_ulpevent_set_owner(event, asoc); |
| 565 | ssf->ssf_assoc_id = sctp_assoc2id(asoc); |
| 566 | return event; |
| 567 | |
| 568 | fail: |
| 569 | return NULL; |
| 570 | } |
| 571 | |
| 572 | /* Create and initialize a SCTP_SHUTDOWN_EVENT notification. |
| 573 | * |
| 574 | * Socket Extensions for SCTP - draft-01 |
| 575 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
| 576 | */ |
| 577 | struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event( |
| 578 | const struct sctp_association *asoc, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 579 | __u16 flags, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | { |
| 581 | struct sctp_ulpevent *event; |
| 582 | struct sctp_shutdown_event *sse; |
| 583 | struct sk_buff *skb; |
| 584 | |
| 585 | event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event), |
| 586 | MSG_NOTIFICATION, gfp); |
| 587 | if (!event) |
| 588 | goto fail; |
| 589 | |
| 590 | skb = sctp_event2skb(event); |
| 591 | sse = (struct sctp_shutdown_event *) |
| 592 | skb_put(skb, sizeof(struct sctp_shutdown_event)); |
| 593 | |
| 594 | /* Socket Extensions for SCTP |
| 595 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
| 596 | * |
| 597 | * sse_type |
| 598 | * It should be SCTP_SHUTDOWN_EVENT |
| 599 | */ |
| 600 | sse->sse_type = SCTP_SHUTDOWN_EVENT; |
| 601 | |
| 602 | /* Socket Extensions for SCTP |
| 603 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
| 604 | * |
| 605 | * sse_flags: 16 bits (unsigned integer) |
| 606 | * Currently unused. |
| 607 | */ |
| 608 | sse->sse_flags = 0; |
| 609 | |
| 610 | /* Socket Extensions for SCTP |
| 611 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
| 612 | * |
| 613 | * sse_length: sizeof (__u32) |
| 614 | * This field is the total length of the notification data, including |
| 615 | * the notification header. |
| 616 | */ |
| 617 | sse->sse_length = sizeof(struct sctp_shutdown_event); |
| 618 | |
| 619 | /* Socket Extensions for SCTP |
| 620 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
| 621 | * |
| 622 | * sse_assoc_id: sizeof (sctp_assoc_t) |
| 623 | * The association id field, holds the identifier for the association. |
| 624 | * All notifications for a given association have the same association |
| 625 | * identifier. For TCP style socket, this field is ignored. |
| 626 | */ |
| 627 | sctp_ulpevent_set_owner(event, asoc); |
| 628 | sse->sse_assoc_id = sctp_assoc2id(asoc); |
| 629 | |
| 630 | return event; |
| 631 | |
| 632 | fail: |
| 633 | return NULL; |
| 634 | } |
| 635 | |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 636 | /* Create and initialize a SCTP_ADAPTATION_INDICATION notification. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | * |
| 638 | * Socket Extensions for SCTP |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 639 | * 5.3.1.6 SCTP_ADAPTATION_INDICATION |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | */ |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 641 | struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication( |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 642 | const struct sctp_association *asoc, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | { |
| 644 | struct sctp_ulpevent *event; |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 645 | struct sctp_adaptation_event *sai; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | struct sk_buff *skb; |
| 647 | |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 648 | event = sctp_ulpevent_new(sizeof(struct sctp_adaptation_event), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | MSG_NOTIFICATION, gfp); |
| 650 | if (!event) |
| 651 | goto fail; |
| 652 | |
| 653 | skb = sctp_event2skb(event); |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 654 | sai = (struct sctp_adaptation_event *) |
| 655 | skb_put(skb, sizeof(struct sctp_adaptation_event)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 657 | sai->sai_type = SCTP_ADAPTATION_INDICATION; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | sai->sai_flags = 0; |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 659 | sai->sai_length = sizeof(struct sctp_adaptation_event); |
| 660 | sai->sai_adaptation_ind = asoc->peer.adaptation_ind; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | sctp_ulpevent_set_owner(event, asoc); |
| 662 | sai->sai_assoc_id = sctp_assoc2id(asoc); |
| 663 | |
| 664 | return event; |
| 665 | |
| 666 | fail: |
| 667 | return NULL; |
| 668 | } |
| 669 | |
| 670 | /* A message has been received. Package this message as a notification |
| 671 | * to pass it to the upper layers. Go ahead and calculate the sndrcvinfo |
| 672 | * even if filtered out later. |
| 673 | * |
| 674 | * Socket Extensions for SCTP |
| 675 | * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV) |
| 676 | */ |
| 677 | struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc, |
| 678 | struct sctp_chunk *chunk, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 679 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | { |
| 681 | struct sctp_ulpevent *event = NULL; |
| 682 | struct sk_buff *skb; |
| 683 | size_t padding, len; |
Neil Horman | 4d93df0 | 2007-08-15 16:07:44 -0700 | [diff] [blame] | 684 | int rx_count; |
| 685 | |
| 686 | /* |
| 687 | * check to see if we need to make space for this |
| 688 | * new skb, expand the rcvbuffer if needed, or drop |
| 689 | * the frame |
| 690 | */ |
| 691 | if (asoc->ep->rcvbuf_policy) |
| 692 | rx_count = atomic_read(&asoc->rmem_alloc); |
| 693 | else |
| 694 | rx_count = atomic_read(&asoc->base.sk->sk_rmem_alloc); |
| 695 | |
| 696 | if (rx_count >= asoc->base.sk->sk_rcvbuf) { |
| 697 | |
| 698 | if ((asoc->base.sk->sk_userlocks & SOCK_RCVBUF_LOCK) || |
Mel Gorman | c76562b | 2012-07-31 16:44:41 -0700 | [diff] [blame] | 699 | (!sk_rmem_schedule(asoc->base.sk, chunk->skb, |
| 700 | chunk->skb->truesize))) |
Neil Horman | 4d93df0 | 2007-08-15 16:07:44 -0700 | [diff] [blame] | 701 | goto fail; |
| 702 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | |
| 704 | /* Clone the original skb, sharing the data. */ |
| 705 | skb = skb_clone(chunk->skb, gfp); |
| 706 | if (!skb) |
| 707 | goto fail; |
| 708 | |
Vlad Yasevich | 3888e9e | 2008-07-08 02:28:39 -0700 | [diff] [blame] | 709 | /* Now that all memory allocations for this chunk succeeded, we |
| 710 | * can mark it as received so the tsn_map is updated correctly. |
| 711 | */ |
Vlad Yasevich | 8e1ee18 | 2008-10-08 14:18:39 -0700 | [diff] [blame] | 712 | if (sctp_tsnmap_mark(&asoc->peer.tsn_map, |
Neil Horman | 4244854 | 2012-06-30 03:04:26 +0000 | [diff] [blame] | 713 | ntohl(chunk->subh.data_hdr->tsn), |
| 714 | chunk->transport)) |
Vlad Yasevich | 8e1ee18 | 2008-10-08 14:18:39 -0700 | [diff] [blame] | 715 | goto fail_mark; |
Vlad Yasevich | 3888e9e | 2008-07-08 02:28:39 -0700 | [diff] [blame] | 716 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | /* First calculate the padding, so we don't inadvertently |
| 718 | * pass up the wrong length to the user. |
| 719 | * |
| 720 | * RFC 2960 - Section 3.2 Chunk Field Descriptions |
| 721 | * |
| 722 | * The total length of a chunk(including Type, Length and Value fields) |
| 723 | * MUST be a multiple of 4 bytes. If the length of the chunk is not a |
| 724 | * multiple of 4 bytes, the sender MUST pad the chunk with all zero |
| 725 | * bytes and this padding is not included in the chunk length field. |
| 726 | * The sender should never pad with more than 3 bytes. The receiver |
| 727 | * MUST ignore the padding bytes. |
| 728 | */ |
| 729 | len = ntohs(chunk->chunk_hdr->length); |
| 730 | padding = WORD_ROUND(len) - len; |
| 731 | |
| 732 | /* Fixup cloned skb with just this chunks data. */ |
| 733 | skb_trim(skb, chunk->chunk_end - padding - skb->data); |
| 734 | |
| 735 | /* Embed the event fields inside the cloned skb. */ |
| 736 | event = sctp_skb2event(skb); |
| 737 | |
Vlad Yasevich | 331c4ee | 2006-10-09 21:34:04 -0700 | [diff] [blame] | 738 | /* Initialize event with flags 0 and correct length |
| 739 | * Since this is a clone of the original skb, only account for |
| 740 | * the data of this chunk as other chunks will be accounted separately. |
| 741 | */ |
| 742 | sctp_ulpevent_init(event, 0, skb->len + sizeof(struct sk_buff)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | |
| 744 | sctp_ulpevent_receive_data(event, asoc); |
| 745 | |
| 746 | event->stream = ntohs(chunk->subh.data_hdr->stream); |
| 747 | event->ssn = ntohs(chunk->subh.data_hdr->ssn); |
| 748 | event->ppid = chunk->subh.data_hdr->ppid; |
| 749 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { |
Ivan Skytte Jorgensen | eaa5c54 | 2005-10-28 15:10:00 -0700 | [diff] [blame] | 750 | event->flags |= SCTP_UNORDERED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | event->cumtsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); |
| 752 | } |
| 753 | event->tsn = ntohl(chunk->subh.data_hdr->tsn); |
| 754 | event->msg_flags |= chunk->chunk_hdr->flags; |
| 755 | event->iif = sctp_chunk_iif(chunk); |
| 756 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | return event; |
Vlad Yasevich | 8e1ee18 | 2008-10-08 14:18:39 -0700 | [diff] [blame] | 758 | |
| 759 | fail_mark: |
| 760 | kfree_skb(skb); |
| 761 | fail: |
| 762 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | } |
| 764 | |
| 765 | /* Create a partial delivery related event. |
| 766 | * |
| 767 | * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT |
| 768 | * |
| 769 | * When a receiver is engaged in a partial delivery of a |
| 770 | * message this notification will be used to indicate |
| 771 | * various events. |
| 772 | */ |
| 773 | struct sctp_ulpevent *sctp_ulpevent_make_pdapi( |
Alexey Dobriyan | 3182cd8 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 774 | const struct sctp_association *asoc, __u32 indication, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 775 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | { |
| 777 | struct sctp_ulpevent *event; |
| 778 | struct sctp_pdapi_event *pd; |
| 779 | struct sk_buff *skb; |
| 780 | |
| 781 | event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event), |
| 782 | MSG_NOTIFICATION, gfp); |
| 783 | if (!event) |
| 784 | goto fail; |
| 785 | |
| 786 | skb = sctp_event2skb(event); |
| 787 | pd = (struct sctp_pdapi_event *) |
| 788 | skb_put(skb, sizeof(struct sctp_pdapi_event)); |
| 789 | |
| 790 | /* pdapi_type |
| 791 | * It should be SCTP_PARTIAL_DELIVERY_EVENT |
| 792 | * |
| 793 | * pdapi_flags: 16 bits (unsigned integer) |
| 794 | * Currently unused. |
| 795 | */ |
| 796 | pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT; |
| 797 | pd->pdapi_flags = 0; |
| 798 | |
| 799 | /* pdapi_length: 32 bits (unsigned integer) |
| 800 | * |
| 801 | * This field is the total length of the notification data, including |
| 802 | * the notification header. It will generally be sizeof (struct |
| 803 | * sctp_pdapi_event). |
| 804 | */ |
| 805 | pd->pdapi_length = sizeof(struct sctp_pdapi_event); |
| 806 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 807 | /* pdapi_indication: 32 bits (unsigned integer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | * |
| 809 | * This field holds the indication being sent to the application. |
| 810 | */ |
| 811 | pd->pdapi_indication = indication; |
| 812 | |
| 813 | /* pdapi_assoc_id: sizeof (sctp_assoc_t) |
| 814 | * |
| 815 | * The association id field, holds the identifier for the association. |
| 816 | */ |
| 817 | sctp_ulpevent_set_owner(event, asoc); |
| 818 | pd->pdapi_assoc_id = sctp_assoc2id(asoc); |
| 819 | |
| 820 | return event; |
| 821 | fail: |
| 822 | return NULL; |
| 823 | } |
| 824 | |
Vlad Yasevich | 65b07e5 | 2007-09-16 19:34:00 -0700 | [diff] [blame] | 825 | struct sctp_ulpevent *sctp_ulpevent_make_authkey( |
| 826 | const struct sctp_association *asoc, __u16 key_id, |
| 827 | __u32 indication, gfp_t gfp) |
| 828 | { |
| 829 | struct sctp_ulpevent *event; |
| 830 | struct sctp_authkey_event *ak; |
| 831 | struct sk_buff *skb; |
| 832 | |
| 833 | event = sctp_ulpevent_new(sizeof(struct sctp_authkey_event), |
| 834 | MSG_NOTIFICATION, gfp); |
| 835 | if (!event) |
| 836 | goto fail; |
| 837 | |
| 838 | skb = sctp_event2skb(event); |
| 839 | ak = (struct sctp_authkey_event *) |
| 840 | skb_put(skb, sizeof(struct sctp_authkey_event)); |
| 841 | |
Wei Yongjun | ee916fd | 2011-04-17 17:28:01 +0000 | [diff] [blame] | 842 | ak->auth_type = SCTP_AUTHENTICATION_EVENT; |
Vlad Yasevich | 65b07e5 | 2007-09-16 19:34:00 -0700 | [diff] [blame] | 843 | ak->auth_flags = 0; |
| 844 | ak->auth_length = sizeof(struct sctp_authkey_event); |
| 845 | |
| 846 | ak->auth_keynumber = key_id; |
| 847 | ak->auth_altkeynumber = 0; |
| 848 | ak->auth_indication = indication; |
| 849 | |
| 850 | /* |
| 851 | * The association id field, holds the identifier for the association. |
| 852 | */ |
| 853 | sctp_ulpevent_set_owner(event, asoc); |
| 854 | ak->auth_assoc_id = sctp_assoc2id(asoc); |
| 855 | |
| 856 | return event; |
| 857 | fail: |
| 858 | return NULL; |
| 859 | } |
| 860 | |
Wei Yongjun | e1cdd55 | 2011-04-17 17:29:03 +0000 | [diff] [blame] | 861 | /* |
| 862 | * Socket Extensions for SCTP |
| 863 | * 6.3.10. SCTP_SENDER_DRY_EVENT |
| 864 | */ |
| 865 | struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event( |
| 866 | const struct sctp_association *asoc, gfp_t gfp) |
| 867 | { |
| 868 | struct sctp_ulpevent *event; |
| 869 | struct sctp_sender_dry_event *sdry; |
| 870 | struct sk_buff *skb; |
| 871 | |
| 872 | event = sctp_ulpevent_new(sizeof(struct sctp_sender_dry_event), |
| 873 | MSG_NOTIFICATION, gfp); |
| 874 | if (!event) |
| 875 | return NULL; |
| 876 | |
| 877 | skb = sctp_event2skb(event); |
| 878 | sdry = (struct sctp_sender_dry_event *) |
| 879 | skb_put(skb, sizeof(struct sctp_sender_dry_event)); |
| 880 | |
| 881 | sdry->sender_dry_type = SCTP_SENDER_DRY_EVENT; |
| 882 | sdry->sender_dry_flags = 0; |
| 883 | sdry->sender_dry_length = sizeof(struct sctp_sender_dry_event); |
| 884 | sctp_ulpevent_set_owner(event, asoc); |
| 885 | sdry->sender_dry_assoc_id = sctp_assoc2id(asoc); |
| 886 | |
| 887 | return event; |
| 888 | } |
Vlad Yasevich | 65b07e5 | 2007-09-16 19:34:00 -0700 | [diff] [blame] | 889 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | /* Return the notification type, assuming this is a notification |
| 891 | * event. |
| 892 | */ |
| 893 | __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event) |
| 894 | { |
| 895 | union sctp_notification *notification; |
| 896 | struct sk_buff *skb; |
| 897 | |
Vlad Yasevich | ab38fb0 | 2008-04-12 18:40:06 -0700 | [diff] [blame] | 898 | skb = sctp_event2skb(event); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | notification = (union sctp_notification *) skb->data; |
| 900 | return notification->sn_header.sn_type; |
| 901 | } |
| 902 | |
| 903 | /* Copy out the sndrcvinfo into a msghdr. */ |
| 904 | void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event, |
| 905 | struct msghdr *msghdr) |
| 906 | { |
| 907 | struct sctp_sndrcvinfo sinfo; |
| 908 | |
| 909 | if (sctp_ulpevent_is_notification(event)) |
| 910 | return; |
| 911 | |
| 912 | /* Sockets API Extensions for SCTP |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 913 | * Section 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV) |
| 914 | * |
| 915 | * sinfo_stream: 16 bits (unsigned integer) |
| 916 | * |
| 917 | * For recvmsg() the SCTP stack places the message's stream number in |
| 918 | * this value. |
| 919 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | sinfo.sinfo_stream = event->stream; |
| 921 | /* sinfo_ssn: 16 bits (unsigned integer) |
| 922 | * |
| 923 | * For recvmsg() this value contains the stream sequence number that |
| 924 | * the remote endpoint placed in the DATA chunk. For fragmented |
| 925 | * messages this is the same number for all deliveries of the message |
| 926 | * (if more than one recvmsg() is needed to read the message). |
| 927 | */ |
| 928 | sinfo.sinfo_ssn = event->ssn; |
| 929 | /* sinfo_ppid: 32 bits (unsigned integer) |
| 930 | * |
| 931 | * In recvmsg() this value is |
| 932 | * the same information that was passed by the upper layer in the peer |
| 933 | * application. Please note that byte order issues are NOT accounted |
| 934 | * for and this information is passed opaquely by the SCTP stack from |
| 935 | * one end to the other. |
| 936 | */ |
| 937 | sinfo.sinfo_ppid = event->ppid; |
| 938 | /* sinfo_flags: 16 bits (unsigned integer) |
| 939 | * |
| 940 | * This field may contain any of the following flags and is composed of |
| 941 | * a bitwise OR of these values. |
| 942 | * |
| 943 | * recvmsg() flags: |
| 944 | * |
Ivan Skytte Jorgensen | eaa5c54 | 2005-10-28 15:10:00 -0700 | [diff] [blame] | 945 | * SCTP_UNORDERED - This flag is present when the message was sent |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | * non-ordered. |
| 947 | */ |
| 948 | sinfo.sinfo_flags = event->flags; |
| 949 | /* sinfo_tsn: 32 bit (unsigned integer) |
| 950 | * |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 951 | * For the receiving side, this field holds a TSN that was |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | * assigned to one of the SCTP Data Chunks. |
| 953 | */ |
| 954 | sinfo.sinfo_tsn = event->tsn; |
| 955 | /* sinfo_cumtsn: 32 bit (unsigned integer) |
| 956 | * |
| 957 | * This field will hold the current cumulative TSN as |
| 958 | * known by the underlying SCTP layer. Note this field is |
| 959 | * ignored when sending and only valid for a receive |
Ivan Skytte Jorgensen | eaa5c54 | 2005-10-28 15:10:00 -0700 | [diff] [blame] | 960 | * operation when sinfo_flags are set to SCTP_UNORDERED. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | */ |
| 962 | sinfo.sinfo_cumtsn = event->cumtsn; |
| 963 | /* sinfo_assoc_id: sizeof (sctp_assoc_t) |
| 964 | * |
| 965 | * The association handle field, sinfo_assoc_id, holds the identifier |
| 966 | * for the association announced in the COMMUNICATION_UP notification. |
| 967 | * All notifications for a given association have the same identifier. |
| 968 | * Ignored for one-to-one style sockets. |
| 969 | */ |
| 970 | sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc); |
| 971 | |
Ivan Skytte Jorgensen | 6ab792f | 2006-12-13 16:34:22 -0800 | [diff] [blame] | 972 | /* context value that is set via SCTP_CONTEXT socket option. */ |
| 973 | sinfo.sinfo_context = event->asoc->default_rcv_context; |
| 974 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | /* These fields are not used while receiving. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | sinfo.sinfo_timetolive = 0; |
| 977 | |
| 978 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV, |
| 979 | sizeof(struct sctp_sndrcvinfo), (void *)&sinfo); |
| 980 | } |
| 981 | |
| 982 | /* Do accounting for bytes received and hold a reference to the association |
| 983 | * for each skb. |
| 984 | */ |
| 985 | static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, |
| 986 | struct sctp_association *asoc) |
| 987 | { |
| 988 | struct sk_buff *skb, *frag; |
| 989 | |
| 990 | skb = sctp_event2skb(event); |
| 991 | /* Set the owner and charge rwnd for bytes received. */ |
| 992 | sctp_ulpevent_set_owner(event, asoc); |
| 993 | sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb)); |
| 994 | |
| 995 | if (!skb->data_len) |
| 996 | return; |
| 997 | |
| 998 | /* Note: Not clearing the entire event struct as this is just a |
| 999 | * fragment of the real event. However, we still need to do rwnd |
| 1000 | * accounting. |
| 1001 | * In general, the skb passed from IP can have only 1 level of |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1002 | * fragments. But we allow multiple levels of fragments. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | */ |
David S. Miller | 1b003be | 2009-06-09 00:22:35 -0700 | [diff] [blame] | 1004 | skb_walk_frags(skb, frag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | } |
| 1007 | |
| 1008 | /* Do accounting for bytes just read by user and release the references to |
| 1009 | * the association. |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1010 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | static void sctp_ulpevent_release_data(struct sctp_ulpevent *event) |
| 1012 | { |
| 1013 | struct sk_buff *skb, *frag; |
Tsutomu Fujii | d7c2c9e | 2006-06-17 22:58:28 -0700 | [diff] [blame] | 1014 | unsigned int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | |
| 1016 | /* Current stack structures assume that the rcv buffer is |
| 1017 | * per socket. For UDP style sockets this is not true as |
| 1018 | * multiple associations may be on a single UDP-style socket. |
| 1019 | * Use the local private area of the skb to track the owning |
| 1020 | * association. |
| 1021 | */ |
| 1022 | |
| 1023 | skb = sctp_event2skb(event); |
Tsutomu Fujii | d7c2c9e | 2006-06-17 22:58:28 -0700 | [diff] [blame] | 1024 | len = skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | |
| 1026 | if (!skb->data_len) |
| 1027 | goto done; |
| 1028 | |
| 1029 | /* Don't forget the fragments. */ |
David S. Miller | 1b003be | 2009-06-09 00:22:35 -0700 | [diff] [blame] | 1030 | skb_walk_frags(skb, frag) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | /* NOTE: skb_shinfos are recursive. Although IP returns |
| 1032 | * skb's with only 1 level of fragments, SCTP reassembly can |
| 1033 | * increase the levels. |
| 1034 | */ |
Tsutomu Fujii | d7c2c9e | 2006-06-17 22:58:28 -0700 | [diff] [blame] | 1035 | sctp_ulpevent_release_frag_data(sctp_skb2event(frag)); |
| 1036 | } |
| 1037 | |
| 1038 | done: |
| 1039 | sctp_assoc_rwnd_increase(event->asoc, len); |
| 1040 | sctp_ulpevent_release_owner(event); |
| 1041 | } |
| 1042 | |
| 1043 | static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event) |
| 1044 | { |
| 1045 | struct sk_buff *skb, *frag; |
| 1046 | |
| 1047 | skb = sctp_event2skb(event); |
| 1048 | |
| 1049 | if (!skb->data_len) |
| 1050 | goto done; |
| 1051 | |
| 1052 | /* Don't forget the fragments. */ |
David S. Miller | 1b003be | 2009-06-09 00:22:35 -0700 | [diff] [blame] | 1053 | skb_walk_frags(skb, frag) { |
Tsutomu Fujii | d7c2c9e | 2006-06-17 22:58:28 -0700 | [diff] [blame] | 1054 | /* NOTE: skb_shinfos are recursive. Although IP returns |
| 1055 | * skb's with only 1 level of fragments, SCTP reassembly can |
| 1056 | * increase the levels. |
| 1057 | */ |
| 1058 | sctp_ulpevent_release_frag_data(sctp_skb2event(frag)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | } |
| 1060 | |
| 1061 | done: |
| 1062 | sctp_ulpevent_release_owner(event); |
| 1063 | } |
| 1064 | |
| 1065 | /* Free a ulpevent that has an owner. It includes releasing the reference |
| 1066 | * to the owner, updating the rwnd in case of a DATA event and freeing the |
| 1067 | * skb. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | */ |
| 1069 | void sctp_ulpevent_free(struct sctp_ulpevent *event) |
| 1070 | { |
| 1071 | if (sctp_ulpevent_is_notification(event)) |
| 1072 | sctp_ulpevent_release_owner(event); |
| 1073 | else |
| 1074 | sctp_ulpevent_release_data(event); |
| 1075 | |
| 1076 | kfree_skb(sctp_event2skb(event)); |
| 1077 | } |
| 1078 | |
| 1079 | /* Purge the skb lists holding ulpevents. */ |
Thomas Graf | cd4fcc7 | 2011-07-08 04:37:46 +0000 | [diff] [blame] | 1080 | unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | { |
| 1082 | struct sk_buff *skb; |
Thomas Graf | cd4fcc7 | 2011-07-08 04:37:46 +0000 | [diff] [blame] | 1083 | unsigned int data_unread = 0; |
| 1084 | |
| 1085 | while ((skb = skb_dequeue(list)) != NULL) { |
| 1086 | struct sctp_ulpevent *event = sctp_skb2event(skb); |
| 1087 | |
| 1088 | if (!sctp_ulpevent_is_notification(event)) |
| 1089 | data_unread += skb->len; |
| 1090 | |
| 1091 | sctp_ulpevent_free(event); |
| 1092 | } |
| 1093 | |
| 1094 | return data_unread; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | } |