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 |
Jeff Kirsher | 4b2f13a | 2013-12-06 06:28:48 -0800 | [diff] [blame] | 25 | * along with GNU CC; see the file COPYING. If not, see |
| 26 | * <http://www.gnu.org/licenses/>. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | * |
| 28 | * Please send any bug reports or fixes you make to the |
| 29 | * email address(es): |
Daniel Borkmann | 91705c6 | 2013-07-23 14:51:47 +0200 | [diff] [blame] | 30 | * lksctp developers <linux-sctp@vger.kernel.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | * Written or modified by: |
| 33 | * Jon Grimm <jgrimm@us.ibm.com> |
| 34 | * La Monte H.P. Yarroll <piggy@acm.org> |
| 35 | * Ardelle Fan <ardelle.fan@intel.com> |
| 36 | * Sridhar Samudrala <sri@us.ibm.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | */ |
| 38 | |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 39 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <linux/types.h> |
| 41 | #include <linux/skbuff.h> |
| 42 | #include <net/sctp/structs.h> |
| 43 | #include <net/sctp/sctp.h> |
| 44 | #include <net/sctp/sm.h> |
| 45 | |
| 46 | static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, |
| 47 | struct sctp_association *asoc); |
| 48 | static void sctp_ulpevent_release_data(struct sctp_ulpevent *event); |
Tsutomu Fujii | d7c2c9e | 2006-06-17 22:58:28 -0700 | [diff] [blame] | 49 | static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event); |
| 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | /* Initialize an ULP event from an given skb. */ |
Daniel Borkmann | dda9192 | 2013-06-17 11:40:05 +0200 | [diff] [blame] | 53 | static void sctp_ulpevent_init(struct sctp_ulpevent *event, |
Marcelo Ricardo Leitner | f5d258e | 2016-07-13 15:08:56 -0300 | [diff] [blame] | 54 | __u16 msg_flags, |
Daniel Borkmann | dda9192 | 2013-06-17 11:40:05 +0200 | [diff] [blame] | 55 | unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | { |
| 57 | memset(event, 0, sizeof(struct sctp_ulpevent)); |
| 58 | event->msg_flags = msg_flags; |
Vlad Yasevich | 331c4ee | 2006-10-09 21:34:04 -0700 | [diff] [blame] | 59 | event->rmem_len = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | } |
| 61 | |
| 62 | /* Create a new sctp_ulpevent. */ |
Marcelo Ricardo Leitner | f5d258e | 2016-07-13 15:08:56 -0300 | [diff] [blame] | 63 | static struct sctp_ulpevent *sctp_ulpevent_new(int size, __u16 msg_flags, |
Daniel Borkmann | dda9192 | 2013-06-17 11:40:05 +0200 | [diff] [blame] | 64 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | { |
| 66 | struct sctp_ulpevent *event; |
| 67 | struct sk_buff *skb; |
| 68 | |
| 69 | skb = alloc_skb(size, gfp); |
| 70 | if (!skb) |
| 71 | goto fail; |
| 72 | |
| 73 | event = sctp_skb2event(skb); |
Vlad Yasevich | 331c4ee | 2006-10-09 21:34:04 -0700 | [diff] [blame] | 74 | sctp_ulpevent_init(event, msg_flags, skb->truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | return event; |
| 77 | |
| 78 | fail: |
| 79 | return NULL; |
| 80 | } |
| 81 | |
| 82 | /* Is this a MSG_NOTIFICATION? */ |
| 83 | int sctp_ulpevent_is_notification(const struct sctp_ulpevent *event) |
| 84 | { |
| 85 | return MSG_NOTIFICATION == (event->msg_flags & MSG_NOTIFICATION); |
| 86 | } |
| 87 | |
| 88 | /* Hold the association in case the msg_name needs read out of |
| 89 | * the association. |
| 90 | */ |
| 91 | static inline void sctp_ulpevent_set_owner(struct sctp_ulpevent *event, |
| 92 | const struct sctp_association *asoc) |
| 93 | { |
Marcelo Ricardo Leitner | 52253db | 2016-07-23 00:33:44 -0300 | [diff] [blame] | 94 | struct sctp_chunk *chunk = event->chunk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Marcelo Ricardo Leitner | 52253db | 2016-07-23 00:33:44 -0300 | [diff] [blame] | 105 | if (chunk && chunk->head_skb && !chunk->head_skb->sk) |
| 106 | chunk->head_skb->sk = asoc->base.sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | /* A simple destructor to give up the reference to the association. */ |
| 110 | static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event) |
| 111 | { |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 112 | struct sctp_association *asoc = event->asoc; |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 113 | |
Vlad Yasevich | 331c4ee | 2006-10-09 21:34:04 -0700 | [diff] [blame] | 114 | atomic_sub(event->rmem_len, &asoc->rmem_alloc); |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 115 | sctp_association_put(asoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | /* Create and initialize an SCTP_ASSOC_CHANGE event. |
| 119 | * |
| 120 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 121 | * |
| 122 | * Communication notifications inform the ULP that an SCTP association |
| 123 | * has either begun or ended. The identifier for a new association is |
| 124 | * provided by this notification. |
| 125 | * |
| 126 | * Note: There is no field checking here. If a field is unused it will be |
| 127 | * zero'd out. |
| 128 | */ |
| 129 | struct sctp_ulpevent *sctp_ulpevent_make_assoc_change( |
| 130 | const struct sctp_association *asoc, |
| 131 | __u16 flags, __u16 state, __u16 error, __u16 outbound, |
Vlad Yasevich | a5a35e7 | 2007-03-23 11:34:08 -0700 | [diff] [blame] | 132 | __u16 inbound, struct sctp_chunk *chunk, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | { |
| 134 | struct sctp_ulpevent *event; |
| 135 | struct sctp_assoc_change *sac; |
| 136 | struct sk_buff *skb; |
| 137 | |
Vlad Yasevich | a5a35e7 | 2007-03-23 11:34:08 -0700 | [diff] [blame] | 138 | /* If the lower layer passed in the chunk, it will be |
| 139 | * an ABORT, so we need to include it in the sac_info. |
| 140 | */ |
| 141 | if (chunk) { |
Vlad Yasevich | a5a35e7 | 2007-03-23 11:34:08 -0700 | [diff] [blame] | 142 | /* Copy the chunk data to a new skb and reserve enough |
| 143 | * head room to use as notification. |
| 144 | */ |
| 145 | skb = skb_copy_expand(chunk->skb, |
| 146 | sizeof(struct sctp_assoc_change), 0, gfp); |
| 147 | |
| 148 | if (!skb) |
| 149 | goto fail; |
| 150 | |
Vlad Yasevich | a5a35e7 | 2007-03-23 11:34:08 -0700 | [diff] [blame] | 151 | /* Embed the event fields inside the cloned skb. */ |
| 152 | event = sctp_skb2event(skb); |
| 153 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
| 154 | |
| 155 | /* Include the notification structure */ |
| 156 | sac = (struct sctp_assoc_change *) |
| 157 | skb_push(skb, sizeof(struct sctp_assoc_change)); |
| 158 | |
| 159 | /* Trim the buffer to the right length. */ |
| 160 | skb_trim(skb, sizeof(struct sctp_assoc_change) + |
Vlad Yasevich | ac40e41 | 2007-05-09 13:52:35 -0700 | [diff] [blame] | 161 | ntohs(chunk->chunk_hdr->length) - |
| 162 | sizeof(sctp_chunkhdr_t)); |
Vlad Yasevich | a5a35e7 | 2007-03-23 11:34:08 -0700 | [diff] [blame] | 163 | } else { |
| 164 | event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | MSG_NOTIFICATION, gfp); |
Vlad Yasevich | a5a35e7 | 2007-03-23 11:34:08 -0700 | [diff] [blame] | 166 | if (!event) |
| 167 | goto fail; |
| 168 | |
| 169 | skb = sctp_event2skb(event); |
| 170 | sac = (struct sctp_assoc_change *) skb_put(skb, |
| 171 | sizeof(struct sctp_assoc_change)); |
| 172 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
| 174 | /* Socket Extensions for SCTP |
| 175 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 176 | * |
| 177 | * sac_type: |
| 178 | * It should be SCTP_ASSOC_CHANGE. |
| 179 | */ |
| 180 | sac->sac_type = SCTP_ASSOC_CHANGE; |
| 181 | |
| 182 | /* Socket Extensions for SCTP |
| 183 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 184 | * |
| 185 | * sac_state: 32 bits (signed integer) |
| 186 | * This field holds one of a number of values that communicate the |
| 187 | * event that happened to the association. |
| 188 | */ |
| 189 | sac->sac_state = state; |
| 190 | |
| 191 | /* Socket Extensions for SCTP |
| 192 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 193 | * |
| 194 | * sac_flags: 16 bits (unsigned integer) |
| 195 | * Currently unused. |
| 196 | */ |
| 197 | sac->sac_flags = 0; |
| 198 | |
| 199 | /* Socket Extensions for SCTP |
| 200 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 201 | * |
| 202 | * sac_length: sizeof (__u32) |
| 203 | * This field is the total length of the notification data, including |
| 204 | * the notification header. |
| 205 | */ |
Vlad Yasevich | b90a137 | 2008-02-14 10:18:20 -0500 | [diff] [blame] | 206 | sac->sac_length = skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
| 208 | /* Socket Extensions for SCTP |
| 209 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 210 | * |
| 211 | * sac_error: 32 bits (signed integer) |
| 212 | * |
| 213 | * If the state was reached due to a error condition (e.g. |
| 214 | * COMMUNICATION_LOST) any relevant error information is available in |
| 215 | * this field. This corresponds to the protocol error codes defined in |
| 216 | * [SCTP]. |
| 217 | */ |
| 218 | sac->sac_error = error; |
| 219 | |
| 220 | /* Socket Extensions for SCTP |
| 221 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 222 | * |
| 223 | * sac_outbound_streams: 16 bits (unsigned integer) |
| 224 | * sac_inbound_streams: 16 bits (unsigned integer) |
| 225 | * |
| 226 | * The maximum number of streams allowed in each direction are |
| 227 | * available in sac_outbound_streams and sac_inbound streams. |
| 228 | */ |
| 229 | sac->sac_outbound_streams = outbound; |
| 230 | sac->sac_inbound_streams = inbound; |
| 231 | |
| 232 | /* Socket Extensions for SCTP |
| 233 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 234 | * |
| 235 | * sac_assoc_id: sizeof (sctp_assoc_t) |
| 236 | * |
| 237 | * The association id field, holds the identifier for the association. |
| 238 | * All notifications for a given association have the same association |
| 239 | * identifier. For TCP style socket, this field is ignored. |
| 240 | */ |
| 241 | sctp_ulpevent_set_owner(event, asoc); |
| 242 | sac->sac_assoc_id = sctp_assoc2id(asoc); |
| 243 | |
| 244 | return event; |
| 245 | |
| 246 | fail: |
| 247 | return NULL; |
| 248 | } |
| 249 | |
| 250 | /* Create and initialize an SCTP_PEER_ADDR_CHANGE event. |
| 251 | * |
| 252 | * Socket Extensions for SCTP - draft-01 |
| 253 | * 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| 254 | * |
| 255 | * When a destination address on a multi-homed peer encounters a change |
| 256 | * an interface details event is sent. |
| 257 | */ |
| 258 | struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change( |
| 259 | const struct sctp_association *asoc, |
| 260 | const struct sockaddr_storage *aaddr, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 261 | int flags, int state, int error, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | { |
| 263 | struct sctp_ulpevent *event; |
| 264 | struct sctp_paddr_change *spc; |
| 265 | struct sk_buff *skb; |
| 266 | |
| 267 | event = sctp_ulpevent_new(sizeof(struct sctp_paddr_change), |
| 268 | MSG_NOTIFICATION, gfp); |
| 269 | if (!event) |
| 270 | goto fail; |
| 271 | |
| 272 | skb = sctp_event2skb(event); |
| 273 | spc = (struct sctp_paddr_change *) |
| 274 | skb_put(skb, sizeof(struct sctp_paddr_change)); |
| 275 | |
| 276 | /* Sockets API Extensions for SCTP |
| 277 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| 278 | * |
| 279 | * spc_type: |
| 280 | * |
| 281 | * It should be SCTP_PEER_ADDR_CHANGE. |
| 282 | */ |
| 283 | spc->spc_type = SCTP_PEER_ADDR_CHANGE; |
| 284 | |
| 285 | /* Sockets API Extensions for SCTP |
| 286 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| 287 | * |
| 288 | * spc_length: sizeof (__u32) |
| 289 | * |
| 290 | * This field is the total length of the notification data, including |
| 291 | * the notification header. |
| 292 | */ |
| 293 | spc->spc_length = sizeof(struct sctp_paddr_change); |
| 294 | |
| 295 | /* Sockets API Extensions for SCTP |
| 296 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| 297 | * |
| 298 | * spc_flags: 16 bits (unsigned integer) |
| 299 | * Currently unused. |
| 300 | */ |
| 301 | spc->spc_flags = 0; |
| 302 | |
| 303 | /* Sockets API Extensions for SCTP |
| 304 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| 305 | * |
| 306 | * spc_state: 32 bits (signed integer) |
| 307 | * |
| 308 | * This field holds one of a number of values that communicate the |
| 309 | * event that happened to the address. |
| 310 | */ |
| 311 | spc->spc_state = state; |
| 312 | |
| 313 | /* Sockets API Extensions for SCTP |
| 314 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| 315 | * |
| 316 | * spc_error: 32 bits (signed integer) |
| 317 | * |
| 318 | * If the state was reached due to any error condition (e.g. |
| 319 | * ADDRESS_UNREACHABLE) any relevant error information is available in |
| 320 | * this field. |
| 321 | */ |
| 322 | spc->spc_error = error; |
| 323 | |
| 324 | /* Socket Extensions for SCTP |
| 325 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
| 326 | * |
| 327 | * spc_assoc_id: sizeof (sctp_assoc_t) |
| 328 | * |
| 329 | * The association id field, holds the identifier for the association. |
| 330 | * All notifications for a given association have the same association |
| 331 | * identifier. For TCP style socket, this field is ignored. |
| 332 | */ |
| 333 | sctp_ulpevent_set_owner(event, asoc); |
| 334 | spc->spc_assoc_id = sctp_assoc2id(asoc); |
| 335 | |
| 336 | /* Sockets API Extensions for SCTP |
| 337 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| 338 | * |
| 339 | * spc_aaddr: sizeof (struct sockaddr_storage) |
| 340 | * |
| 341 | * The affected address field, holds the remote peer's address that is |
| 342 | * encountering the change of state. |
| 343 | */ |
| 344 | memcpy(&spc->spc_aaddr, aaddr, sizeof(struct sockaddr_storage)); |
| 345 | |
| 346 | /* Map ipv4 address into v4-mapped-on-v6 address. */ |
Jason Gunthorpe | 299ee12 | 2014-07-30 12:40:53 -0600 | [diff] [blame] | 347 | sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_to_user( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | sctp_sk(asoc->base.sk), |
| 349 | (union sctp_addr *)&spc->spc_aaddr); |
| 350 | |
| 351 | return event; |
| 352 | |
| 353 | fail: |
| 354 | return NULL; |
| 355 | } |
| 356 | |
| 357 | /* Create and initialize an SCTP_REMOTE_ERROR notification. |
| 358 | * |
| 359 | * Note: This assumes that the chunk->skb->data already points to the |
| 360 | * operation error payload. |
| 361 | * |
| 362 | * Socket Extensions for SCTP - draft-01 |
| 363 | * 5.3.1.3 SCTP_REMOTE_ERROR |
| 364 | * |
| 365 | * A remote peer may send an Operational Error message to its peer. |
| 366 | * This message indicates a variety of error conditions on an |
| 367 | * association. The entire error TLV as it appears on the wire is |
| 368 | * included in a SCTP_REMOTE_ERROR event. Please refer to the SCTP |
| 369 | * specification [SCTP] and any extensions for a list of possible |
| 370 | * error formats. |
| 371 | */ |
Daniel Borkmann | 8f2e5ae | 2014-07-12 20:30:35 +0200 | [diff] [blame] | 372 | struct sctp_ulpevent * |
| 373 | sctp_ulpevent_make_remote_error(const struct sctp_association *asoc, |
| 374 | struct sctp_chunk *chunk, __u16 flags, |
| 375 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | { |
| 377 | struct sctp_ulpevent *event; |
| 378 | struct sctp_remote_error *sre; |
| 379 | struct sk_buff *skb; |
| 380 | sctp_errhdr_t *ch; |
Al Viro | 9f81bcd | 2006-11-20 17:26:34 -0800 | [diff] [blame] | 381 | __be16 cause; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | int elen; |
| 383 | |
| 384 | ch = (sctp_errhdr_t *)(chunk->skb->data); |
| 385 | cause = ch->cause; |
| 386 | elen = WORD_ROUND(ntohs(ch->length)) - sizeof(sctp_errhdr_t); |
| 387 | |
| 388 | /* Pull off the ERROR header. */ |
| 389 | skb_pull(chunk->skb, sizeof(sctp_errhdr_t)); |
| 390 | |
| 391 | /* Copy the skb to a new skb with room for us to prepend |
| 392 | * notification with. |
| 393 | */ |
Daniel Borkmann | 8f2e5ae | 2014-07-12 20:30:35 +0200 | [diff] [blame] | 394 | skb = skb_copy_expand(chunk->skb, sizeof(*sre), 0, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
| 396 | /* Pull off the rest of the cause TLV from the chunk. */ |
| 397 | skb_pull(chunk->skb, elen); |
| 398 | if (!skb) |
| 399 | goto fail; |
| 400 | |
| 401 | /* Embed the event fields inside the cloned skb. */ |
| 402 | event = sctp_skb2event(skb); |
Vlad Yasevich | 331c4ee | 2006-10-09 21:34:04 -0700 | [diff] [blame] | 403 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | |
Daniel Borkmann | 8f2e5ae | 2014-07-12 20:30:35 +0200 | [diff] [blame] | 405 | sre = (struct sctp_remote_error *) skb_push(skb, sizeof(*sre)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | |
| 407 | /* Trim the buffer to the right length. */ |
Daniel Borkmann | 8f2e5ae | 2014-07-12 20:30:35 +0200 | [diff] [blame] | 408 | skb_trim(skb, sizeof(*sre) + elen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
Daniel Borkmann | 8f2e5ae | 2014-07-12 20:30:35 +0200 | [diff] [blame] | 410 | /* RFC6458, Section 6.1.3. SCTP_REMOTE_ERROR */ |
| 411 | memset(sre, 0, sizeof(*sre)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | sre->sre_type = SCTP_REMOTE_ERROR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | sre->sre_flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | sre->sre_length = skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | sre->sre_error = cause; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | sctp_ulpevent_set_owner(event, asoc); |
| 417 | sre->sre_assoc_id = sctp_assoc2id(asoc); |
| 418 | |
| 419 | return event; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | fail: |
| 421 | return NULL; |
| 422 | } |
| 423 | |
| 424 | /* Create and initialize a SCTP_SEND_FAILED notification. |
| 425 | * |
| 426 | * Socket Extensions for SCTP - draft-01 |
| 427 | * 5.3.1.4 SCTP_SEND_FAILED |
| 428 | */ |
| 429 | struct sctp_ulpevent *sctp_ulpevent_make_send_failed( |
| 430 | const struct sctp_association *asoc, struct sctp_chunk *chunk, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 431 | __u16 flags, __u32 error, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | { |
| 433 | struct sctp_ulpevent *event; |
| 434 | struct sctp_send_failed *ssf; |
| 435 | struct sk_buff *skb; |
| 436 | |
| 437 | /* Pull off any padding. */ |
| 438 | int len = ntohs(chunk->chunk_hdr->length); |
| 439 | |
| 440 | /* Make skb with more room so we can prepend notification. */ |
| 441 | skb = skb_copy_expand(chunk->skb, |
| 442 | sizeof(struct sctp_send_failed), /* headroom */ |
| 443 | 0, /* tailroom */ |
| 444 | gfp); |
| 445 | if (!skb) |
| 446 | goto fail; |
| 447 | |
| 448 | /* Pull off the common chunk header and DATA header. */ |
| 449 | skb_pull(skb, sizeof(struct sctp_data_chunk)); |
| 450 | len -= sizeof(struct sctp_data_chunk); |
| 451 | |
| 452 | /* Embed the event fields inside the cloned skb. */ |
| 453 | event = sctp_skb2event(skb); |
Vlad Yasevich | 331c4ee | 2006-10-09 21:34:04 -0700 | [diff] [blame] | 454 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
| 456 | ssf = (struct sctp_send_failed *) |
| 457 | skb_push(skb, sizeof(struct sctp_send_failed)); |
| 458 | |
| 459 | /* Socket Extensions for SCTP |
| 460 | * 5.3.1.4 SCTP_SEND_FAILED |
| 461 | * |
| 462 | * ssf_type: |
| 463 | * It should be SCTP_SEND_FAILED. |
| 464 | */ |
| 465 | ssf->ssf_type = SCTP_SEND_FAILED; |
| 466 | |
| 467 | /* Socket Extensions for SCTP |
| 468 | * 5.3.1.4 SCTP_SEND_FAILED |
| 469 | * |
| 470 | * ssf_flags: 16 bits (unsigned integer) |
| 471 | * The flag value will take one of the following values |
| 472 | * |
| 473 | * SCTP_DATA_UNSENT - Indicates that the data was never put on |
| 474 | * the wire. |
| 475 | * |
| 476 | * SCTP_DATA_SENT - Indicates that the data was put on the wire. |
| 477 | * Note that this does not necessarily mean that the |
| 478 | * data was (or was not) successfully delivered. |
| 479 | */ |
| 480 | ssf->ssf_flags = flags; |
| 481 | |
| 482 | /* Socket Extensions for SCTP |
| 483 | * 5.3.1.4 SCTP_SEND_FAILED |
| 484 | * |
| 485 | * ssf_length: sizeof (__u32) |
| 486 | * This field is the total length of the notification data, including |
| 487 | * the notification header. |
| 488 | */ |
| 489 | ssf->ssf_length = sizeof(struct sctp_send_failed) + len; |
| 490 | skb_trim(skb, ssf->ssf_length); |
| 491 | |
| 492 | /* Socket Extensions for SCTP |
| 493 | * 5.3.1.4 SCTP_SEND_FAILED |
| 494 | * |
| 495 | * ssf_error: 16 bits (unsigned integer) |
| 496 | * This value represents the reason why the send failed, and if set, |
| 497 | * will be a SCTP protocol error code as defined in [SCTP] section |
| 498 | * 3.3.10. |
| 499 | */ |
| 500 | ssf->ssf_error = error; |
| 501 | |
| 502 | /* Socket Extensions for SCTP |
| 503 | * 5.3.1.4 SCTP_SEND_FAILED |
| 504 | * |
| 505 | * ssf_info: sizeof (struct sctp_sndrcvinfo) |
| 506 | * The original send information associated with the undelivered |
| 507 | * message. |
| 508 | */ |
| 509 | memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo)); |
| 510 | |
| 511 | /* Per TSVWG discussion with Randy. Allow the application to |
Lucas De Marchi | e9c5499 | 2011-04-26 23:28:26 -0700 | [diff] [blame] | 512 | * reassemble a fragmented message. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | */ |
| 514 | ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags; |
| 515 | |
| 516 | /* Socket Extensions for SCTP |
| 517 | * 5.3.1.4 SCTP_SEND_FAILED |
| 518 | * |
| 519 | * ssf_assoc_id: sizeof (sctp_assoc_t) |
| 520 | * The association id field, sf_assoc_id, holds the identifier for the |
| 521 | * association. All notifications for a given association have the |
| 522 | * same association identifier. For TCP style socket, this field is |
| 523 | * ignored. |
| 524 | */ |
| 525 | sctp_ulpevent_set_owner(event, asoc); |
| 526 | ssf->ssf_assoc_id = sctp_assoc2id(asoc); |
| 527 | return event; |
| 528 | |
| 529 | fail: |
| 530 | return NULL; |
| 531 | } |
| 532 | |
| 533 | /* Create and initialize a SCTP_SHUTDOWN_EVENT notification. |
| 534 | * |
| 535 | * Socket Extensions for SCTP - draft-01 |
| 536 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
| 537 | */ |
| 538 | struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event( |
| 539 | const struct sctp_association *asoc, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 540 | __u16 flags, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | { |
| 542 | struct sctp_ulpevent *event; |
| 543 | struct sctp_shutdown_event *sse; |
| 544 | struct sk_buff *skb; |
| 545 | |
| 546 | event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event), |
| 547 | MSG_NOTIFICATION, gfp); |
| 548 | if (!event) |
| 549 | goto fail; |
| 550 | |
| 551 | skb = sctp_event2skb(event); |
| 552 | sse = (struct sctp_shutdown_event *) |
| 553 | skb_put(skb, sizeof(struct sctp_shutdown_event)); |
| 554 | |
| 555 | /* Socket Extensions for SCTP |
| 556 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
| 557 | * |
| 558 | * sse_type |
| 559 | * It should be SCTP_SHUTDOWN_EVENT |
| 560 | */ |
| 561 | sse->sse_type = SCTP_SHUTDOWN_EVENT; |
| 562 | |
| 563 | /* Socket Extensions for SCTP |
| 564 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
| 565 | * |
| 566 | * sse_flags: 16 bits (unsigned integer) |
| 567 | * Currently unused. |
| 568 | */ |
| 569 | sse->sse_flags = 0; |
| 570 | |
| 571 | /* Socket Extensions for SCTP |
| 572 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
| 573 | * |
| 574 | * sse_length: sizeof (__u32) |
| 575 | * This field is the total length of the notification data, including |
| 576 | * the notification header. |
| 577 | */ |
| 578 | sse->sse_length = sizeof(struct sctp_shutdown_event); |
| 579 | |
| 580 | /* Socket Extensions for SCTP |
| 581 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
| 582 | * |
| 583 | * sse_assoc_id: sizeof (sctp_assoc_t) |
| 584 | * The association id field, holds the identifier for the association. |
| 585 | * All notifications for a given association have the same association |
| 586 | * identifier. For TCP style socket, this field is ignored. |
| 587 | */ |
| 588 | sctp_ulpevent_set_owner(event, asoc); |
| 589 | sse->sse_assoc_id = sctp_assoc2id(asoc); |
| 590 | |
| 591 | return event; |
| 592 | |
| 593 | fail: |
| 594 | return NULL; |
| 595 | } |
| 596 | |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 597 | /* Create and initialize a SCTP_ADAPTATION_INDICATION notification. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | * |
| 599 | * Socket Extensions for SCTP |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 600 | * 5.3.1.6 SCTP_ADAPTATION_INDICATION |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | */ |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 602 | struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication( |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 603 | const struct sctp_association *asoc, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | { |
| 605 | struct sctp_ulpevent *event; |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 606 | struct sctp_adaptation_event *sai; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | struct sk_buff *skb; |
| 608 | |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 609 | event = sctp_ulpevent_new(sizeof(struct sctp_adaptation_event), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | MSG_NOTIFICATION, gfp); |
| 611 | if (!event) |
| 612 | goto fail; |
| 613 | |
| 614 | skb = sctp_event2skb(event); |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 615 | sai = (struct sctp_adaptation_event *) |
| 616 | skb_put(skb, sizeof(struct sctp_adaptation_event)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 618 | sai->sai_type = SCTP_ADAPTATION_INDICATION; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | sai->sai_flags = 0; |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 620 | sai->sai_length = sizeof(struct sctp_adaptation_event); |
| 621 | sai->sai_adaptation_ind = asoc->peer.adaptation_ind; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | sctp_ulpevent_set_owner(event, asoc); |
| 623 | sai->sai_assoc_id = sctp_assoc2id(asoc); |
| 624 | |
| 625 | return event; |
| 626 | |
| 627 | fail: |
| 628 | return NULL; |
| 629 | } |
| 630 | |
| 631 | /* A message has been received. Package this message as a notification |
| 632 | * to pass it to the upper layers. Go ahead and calculate the sndrcvinfo |
| 633 | * even if filtered out later. |
| 634 | * |
| 635 | * Socket Extensions for SCTP |
| 636 | * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV) |
| 637 | */ |
| 638 | struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc, |
| 639 | struct sctp_chunk *chunk, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 640 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | { |
| 642 | struct sctp_ulpevent *event = NULL; |
| 643 | struct sk_buff *skb; |
| 644 | size_t padding, len; |
Neil Horman | 4d93df0 | 2007-08-15 16:07:44 -0700 | [diff] [blame] | 645 | int rx_count; |
| 646 | |
| 647 | /* |
| 648 | * check to see if we need to make space for this |
| 649 | * new skb, expand the rcvbuffer if needed, or drop |
| 650 | * the frame |
| 651 | */ |
| 652 | if (asoc->ep->rcvbuf_policy) |
| 653 | rx_count = atomic_read(&asoc->rmem_alloc); |
| 654 | else |
| 655 | rx_count = atomic_read(&asoc->base.sk->sk_rmem_alloc); |
| 656 | |
| 657 | if (rx_count >= asoc->base.sk->sk_rcvbuf) { |
| 658 | |
| 659 | if ((asoc->base.sk->sk_userlocks & SOCK_RCVBUF_LOCK) || |
Mel Gorman | c76562b | 2012-07-31 16:44:41 -0700 | [diff] [blame] | 660 | (!sk_rmem_schedule(asoc->base.sk, chunk->skb, |
| 661 | chunk->skb->truesize))) |
Neil Horman | 4d93df0 | 2007-08-15 16:07:44 -0700 | [diff] [blame] | 662 | goto fail; |
| 663 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
| 665 | /* Clone the original skb, sharing the data. */ |
| 666 | skb = skb_clone(chunk->skb, gfp); |
| 667 | if (!skb) |
| 668 | goto fail; |
| 669 | |
Vlad Yasevich | 3888e9e | 2008-07-08 02:28:39 -0700 | [diff] [blame] | 670 | /* Now that all memory allocations for this chunk succeeded, we |
| 671 | * can mark it as received so the tsn_map is updated correctly. |
| 672 | */ |
Vlad Yasevich | 8e1ee18 | 2008-10-08 14:18:39 -0700 | [diff] [blame] | 673 | if (sctp_tsnmap_mark(&asoc->peer.tsn_map, |
Neil Horman | 4244854 | 2012-06-30 03:04:26 +0000 | [diff] [blame] | 674 | ntohl(chunk->subh.data_hdr->tsn), |
| 675 | chunk->transport)) |
Vlad Yasevich | 8e1ee18 | 2008-10-08 14:18:39 -0700 | [diff] [blame] | 676 | goto fail_mark; |
Vlad Yasevich | 3888e9e | 2008-07-08 02:28:39 -0700 | [diff] [blame] | 677 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | /* First calculate the padding, so we don't inadvertently |
| 679 | * pass up the wrong length to the user. |
| 680 | * |
| 681 | * RFC 2960 - Section 3.2 Chunk Field Descriptions |
| 682 | * |
| 683 | * The total length of a chunk(including Type, Length and Value fields) |
| 684 | * MUST be a multiple of 4 bytes. If the length of the chunk is not a |
| 685 | * multiple of 4 bytes, the sender MUST pad the chunk with all zero |
| 686 | * bytes and this padding is not included in the chunk length field. |
| 687 | * The sender should never pad with more than 3 bytes. The receiver |
| 688 | * MUST ignore the padding bytes. |
| 689 | */ |
| 690 | len = ntohs(chunk->chunk_hdr->length); |
| 691 | padding = WORD_ROUND(len) - len; |
| 692 | |
| 693 | /* Fixup cloned skb with just this chunks data. */ |
| 694 | skb_trim(skb, chunk->chunk_end - padding - skb->data); |
| 695 | |
| 696 | /* Embed the event fields inside the cloned skb. */ |
| 697 | event = sctp_skb2event(skb); |
| 698 | |
Vlad Yasevich | 331c4ee | 2006-10-09 21:34:04 -0700 | [diff] [blame] | 699 | /* Initialize event with flags 0 and correct length |
| 700 | * Since this is a clone of the original skb, only account for |
| 701 | * the data of this chunk as other chunks will be accounted separately. |
| 702 | */ |
| 703 | sctp_ulpevent_init(event, 0, skb->len + sizeof(struct sk_buff)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | |
| 705 | sctp_ulpevent_receive_data(event, asoc); |
| 706 | |
Marcelo Ricardo Leitner | 1f45f78 | 2016-07-13 15:08:57 -0300 | [diff] [blame] | 707 | /* And hold the chunk as we need it for getting the IP headers |
| 708 | * later in recvmsg |
| 709 | */ |
| 710 | sctp_chunk_hold(chunk); |
| 711 | event->chunk = chunk; |
| 712 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | event->stream = ntohs(chunk->subh.data_hdr->stream); |
| 714 | event->ssn = ntohs(chunk->subh.data_hdr->ssn); |
| 715 | event->ppid = chunk->subh.data_hdr->ppid; |
| 716 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { |
Ivan Skytte Jorgensen | eaa5c54 | 2005-10-28 15:10:00 -0700 | [diff] [blame] | 717 | event->flags |= SCTP_UNORDERED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | event->cumtsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); |
| 719 | } |
| 720 | event->tsn = ntohl(chunk->subh.data_hdr->tsn); |
| 721 | event->msg_flags |= chunk->chunk_hdr->flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | return event; |
Vlad Yasevich | 8e1ee18 | 2008-10-08 14:18:39 -0700 | [diff] [blame] | 724 | |
| 725 | fail_mark: |
Marcelo Ricardo Leitner | 1f45f78 | 2016-07-13 15:08:57 -0300 | [diff] [blame] | 726 | sctp_chunk_put(chunk); |
Vlad Yasevich | 8e1ee18 | 2008-10-08 14:18:39 -0700 | [diff] [blame] | 727 | kfree_skb(skb); |
| 728 | fail: |
| 729 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | } |
| 731 | |
| 732 | /* Create a partial delivery related event. |
| 733 | * |
| 734 | * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT |
| 735 | * |
| 736 | * When a receiver is engaged in a partial delivery of a |
| 737 | * message this notification will be used to indicate |
| 738 | * various events. |
| 739 | */ |
| 740 | struct sctp_ulpevent *sctp_ulpevent_make_pdapi( |
Alexey Dobriyan | 3182cd8 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 741 | const struct sctp_association *asoc, __u32 indication, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 742 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | { |
| 744 | struct sctp_ulpevent *event; |
| 745 | struct sctp_pdapi_event *pd; |
| 746 | struct sk_buff *skb; |
| 747 | |
| 748 | event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event), |
| 749 | MSG_NOTIFICATION, gfp); |
| 750 | if (!event) |
| 751 | goto fail; |
| 752 | |
| 753 | skb = sctp_event2skb(event); |
| 754 | pd = (struct sctp_pdapi_event *) |
| 755 | skb_put(skb, sizeof(struct sctp_pdapi_event)); |
| 756 | |
| 757 | /* pdapi_type |
| 758 | * It should be SCTP_PARTIAL_DELIVERY_EVENT |
| 759 | * |
| 760 | * pdapi_flags: 16 bits (unsigned integer) |
| 761 | * Currently unused. |
| 762 | */ |
| 763 | pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT; |
| 764 | pd->pdapi_flags = 0; |
| 765 | |
| 766 | /* pdapi_length: 32 bits (unsigned integer) |
| 767 | * |
| 768 | * This field is the total length of the notification data, including |
| 769 | * the notification header. It will generally be sizeof (struct |
| 770 | * sctp_pdapi_event). |
| 771 | */ |
| 772 | pd->pdapi_length = sizeof(struct sctp_pdapi_event); |
| 773 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 774 | /* pdapi_indication: 32 bits (unsigned integer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | * |
| 776 | * This field holds the indication being sent to the application. |
| 777 | */ |
| 778 | pd->pdapi_indication = indication; |
| 779 | |
| 780 | /* pdapi_assoc_id: sizeof (sctp_assoc_t) |
| 781 | * |
| 782 | * The association id field, holds the identifier for the association. |
| 783 | */ |
| 784 | sctp_ulpevent_set_owner(event, asoc); |
| 785 | pd->pdapi_assoc_id = sctp_assoc2id(asoc); |
| 786 | |
| 787 | return event; |
| 788 | fail: |
| 789 | return NULL; |
| 790 | } |
| 791 | |
Vlad Yasevich | 65b07e5 | 2007-09-16 19:34:00 -0700 | [diff] [blame] | 792 | struct sctp_ulpevent *sctp_ulpevent_make_authkey( |
| 793 | const struct sctp_association *asoc, __u16 key_id, |
| 794 | __u32 indication, gfp_t gfp) |
| 795 | { |
| 796 | struct sctp_ulpevent *event; |
| 797 | struct sctp_authkey_event *ak; |
| 798 | struct sk_buff *skb; |
| 799 | |
| 800 | event = sctp_ulpevent_new(sizeof(struct sctp_authkey_event), |
| 801 | MSG_NOTIFICATION, gfp); |
| 802 | if (!event) |
| 803 | goto fail; |
| 804 | |
| 805 | skb = sctp_event2skb(event); |
| 806 | ak = (struct sctp_authkey_event *) |
| 807 | skb_put(skb, sizeof(struct sctp_authkey_event)); |
| 808 | |
Wei Yongjun | ee916fd | 2011-04-17 17:28:01 +0000 | [diff] [blame] | 809 | ak->auth_type = SCTP_AUTHENTICATION_EVENT; |
Vlad Yasevich | 65b07e5 | 2007-09-16 19:34:00 -0700 | [diff] [blame] | 810 | ak->auth_flags = 0; |
| 811 | ak->auth_length = sizeof(struct sctp_authkey_event); |
| 812 | |
| 813 | ak->auth_keynumber = key_id; |
| 814 | ak->auth_altkeynumber = 0; |
| 815 | ak->auth_indication = indication; |
| 816 | |
| 817 | /* |
| 818 | * The association id field, holds the identifier for the association. |
| 819 | */ |
| 820 | sctp_ulpevent_set_owner(event, asoc); |
| 821 | ak->auth_assoc_id = sctp_assoc2id(asoc); |
| 822 | |
| 823 | return event; |
| 824 | fail: |
| 825 | return NULL; |
| 826 | } |
| 827 | |
Wei Yongjun | e1cdd55 | 2011-04-17 17:29:03 +0000 | [diff] [blame] | 828 | /* |
| 829 | * Socket Extensions for SCTP |
| 830 | * 6.3.10. SCTP_SENDER_DRY_EVENT |
| 831 | */ |
| 832 | struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event( |
| 833 | const struct sctp_association *asoc, gfp_t gfp) |
| 834 | { |
| 835 | struct sctp_ulpevent *event; |
| 836 | struct sctp_sender_dry_event *sdry; |
| 837 | struct sk_buff *skb; |
| 838 | |
| 839 | event = sctp_ulpevent_new(sizeof(struct sctp_sender_dry_event), |
| 840 | MSG_NOTIFICATION, gfp); |
| 841 | if (!event) |
| 842 | return NULL; |
| 843 | |
| 844 | skb = sctp_event2skb(event); |
| 845 | sdry = (struct sctp_sender_dry_event *) |
| 846 | skb_put(skb, sizeof(struct sctp_sender_dry_event)); |
| 847 | |
| 848 | sdry->sender_dry_type = SCTP_SENDER_DRY_EVENT; |
| 849 | sdry->sender_dry_flags = 0; |
| 850 | sdry->sender_dry_length = sizeof(struct sctp_sender_dry_event); |
| 851 | sctp_ulpevent_set_owner(event, asoc); |
| 852 | sdry->sender_dry_assoc_id = sctp_assoc2id(asoc); |
| 853 | |
| 854 | return event; |
| 855 | } |
Vlad Yasevich | 65b07e5 | 2007-09-16 19:34:00 -0700 | [diff] [blame] | 856 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | /* Return the notification type, assuming this is a notification |
| 858 | * event. |
| 859 | */ |
| 860 | __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event) |
| 861 | { |
| 862 | union sctp_notification *notification; |
| 863 | struct sk_buff *skb; |
| 864 | |
Vlad Yasevich | ab38fb0 | 2008-04-12 18:40:06 -0700 | [diff] [blame] | 865 | skb = sctp_event2skb(event); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | notification = (union sctp_notification *) skb->data; |
| 867 | return notification->sn_header.sn_type; |
| 868 | } |
| 869 | |
Daniel Borkmann | 8f2e5ae | 2014-07-12 20:30:35 +0200 | [diff] [blame] | 870 | /* RFC6458, Section 5.3.2. SCTP Header Information Structure |
| 871 | * (SCTP_SNDRCV, DEPRECATED) |
| 872 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event, |
| 874 | struct msghdr *msghdr) |
| 875 | { |
| 876 | struct sctp_sndrcvinfo sinfo; |
| 877 | |
| 878 | if (sctp_ulpevent_is_notification(event)) |
| 879 | return; |
| 880 | |
Daniel Borkmann | 8f2e5ae | 2014-07-12 20:30:35 +0200 | [diff] [blame] | 881 | memset(&sinfo, 0, sizeof(sinfo)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | sinfo.sinfo_stream = event->stream; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | sinfo.sinfo_ssn = event->ssn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | sinfo.sinfo_ppid = event->ppid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | sinfo.sinfo_flags = event->flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | sinfo.sinfo_tsn = event->tsn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | sinfo.sinfo_cumtsn = event->cumtsn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc); |
Daniel Borkmann | 8f2e5ae | 2014-07-12 20:30:35 +0200 | [diff] [blame] | 889 | /* Context value that is set via SCTP_CONTEXT socket option. */ |
Ivan Skytte Jorgensen | 6ab792f | 2006-12-13 16:34:22 -0800 | [diff] [blame] | 890 | sinfo.sinfo_context = event->asoc->default_rcv_context; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | /* These fields are not used while receiving. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | sinfo.sinfo_timetolive = 0; |
| 893 | |
| 894 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV, |
Daniel Borkmann | 8f2e5ae | 2014-07-12 20:30:35 +0200 | [diff] [blame] | 895 | sizeof(sinfo), &sinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | } |
| 897 | |
Geir Ola Vaagland | 0d3a421 | 2014-07-12 20:30:37 +0200 | [diff] [blame] | 898 | /* RFC6458, Section 5.3.5 SCTP Receive Information Structure |
| 899 | * (SCTP_SNDRCV) |
| 900 | */ |
| 901 | void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event, |
| 902 | struct msghdr *msghdr) |
| 903 | { |
| 904 | struct sctp_rcvinfo rinfo; |
| 905 | |
| 906 | if (sctp_ulpevent_is_notification(event)) |
| 907 | return; |
| 908 | |
| 909 | memset(&rinfo, 0, sizeof(struct sctp_rcvinfo)); |
| 910 | rinfo.rcv_sid = event->stream; |
| 911 | rinfo.rcv_ssn = event->ssn; |
| 912 | rinfo.rcv_ppid = event->ppid; |
| 913 | rinfo.rcv_flags = event->flags; |
| 914 | rinfo.rcv_tsn = event->tsn; |
| 915 | rinfo.rcv_cumtsn = event->cumtsn; |
| 916 | rinfo.rcv_assoc_id = sctp_assoc2id(event->asoc); |
| 917 | rinfo.rcv_context = event->asoc->default_rcv_context; |
| 918 | |
| 919 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_RCVINFO, |
| 920 | sizeof(rinfo), &rinfo); |
| 921 | } |
| 922 | |
Geir Ola Vaagland | 2347c80 | 2014-07-12 20:30:38 +0200 | [diff] [blame] | 923 | /* RFC6458, Section 5.3.6. SCTP Next Receive Information Structure |
| 924 | * (SCTP_NXTINFO) |
| 925 | */ |
| 926 | static void __sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event, |
| 927 | struct msghdr *msghdr, |
| 928 | const struct sk_buff *skb) |
| 929 | { |
| 930 | struct sctp_nxtinfo nxtinfo; |
| 931 | |
| 932 | memset(&nxtinfo, 0, sizeof(nxtinfo)); |
| 933 | nxtinfo.nxt_sid = event->stream; |
| 934 | nxtinfo.nxt_ppid = event->ppid; |
| 935 | nxtinfo.nxt_flags = event->flags; |
| 936 | if (sctp_ulpevent_is_notification(event)) |
| 937 | nxtinfo.nxt_flags |= SCTP_NOTIFICATION; |
| 938 | nxtinfo.nxt_length = skb->len; |
| 939 | nxtinfo.nxt_assoc_id = sctp_assoc2id(event->asoc); |
| 940 | |
| 941 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_NXTINFO, |
| 942 | sizeof(nxtinfo), &nxtinfo); |
| 943 | } |
| 944 | |
| 945 | void sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event, |
| 946 | struct msghdr *msghdr, |
| 947 | struct sock *sk) |
| 948 | { |
| 949 | struct sk_buff *skb; |
| 950 | int err; |
| 951 | |
| 952 | skb = sctp_skb_recv_datagram(sk, MSG_PEEK, 1, &err); |
| 953 | if (skb != NULL) { |
| 954 | __sctp_ulpevent_read_nxtinfo(sctp_skb2event(skb), |
| 955 | msghdr, skb); |
| 956 | /* Just release refcount here. */ |
| 957 | kfree_skb(skb); |
| 958 | } |
| 959 | } |
| 960 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | /* Do accounting for bytes received and hold a reference to the association |
| 962 | * for each skb. |
| 963 | */ |
| 964 | static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, |
| 965 | struct sctp_association *asoc) |
| 966 | { |
| 967 | struct sk_buff *skb, *frag; |
| 968 | |
| 969 | skb = sctp_event2skb(event); |
| 970 | /* Set the owner and charge rwnd for bytes received. */ |
| 971 | sctp_ulpevent_set_owner(event, asoc); |
Daniel Borkmann | 362d520 | 2014-04-14 21:45:17 +0200 | [diff] [blame] | 972 | sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | |
| 974 | if (!skb->data_len) |
| 975 | return; |
| 976 | |
| 977 | /* Note: Not clearing the entire event struct as this is just a |
| 978 | * fragment of the real event. However, we still need to do rwnd |
| 979 | * accounting. |
| 980 | * 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] | 981 | * fragments. But we allow multiple levels of fragments. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | */ |
David S. Miller | 1b003be | 2009-06-09 00:22:35 -0700 | [diff] [blame] | 983 | skb_walk_frags(skb, frag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | } |
| 986 | |
| 987 | /* Do accounting for bytes just read by user and release the references to |
| 988 | * the association. |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 989 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | static void sctp_ulpevent_release_data(struct sctp_ulpevent *event) |
| 991 | { |
| 992 | struct sk_buff *skb, *frag; |
Tsutomu Fujii | d7c2c9e | 2006-06-17 22:58:28 -0700 | [diff] [blame] | 993 | unsigned int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | |
| 995 | /* Current stack structures assume that the rcv buffer is |
| 996 | * per socket. For UDP style sockets this is not true as |
| 997 | * multiple associations may be on a single UDP-style socket. |
| 998 | * Use the local private area of the skb to track the owning |
| 999 | * association. |
| 1000 | */ |
| 1001 | |
| 1002 | skb = sctp_event2skb(event); |
Tsutomu Fujii | d7c2c9e | 2006-06-17 22:58:28 -0700 | [diff] [blame] | 1003 | len = skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | |
| 1005 | if (!skb->data_len) |
| 1006 | goto done; |
| 1007 | |
| 1008 | /* Don't forget the fragments. */ |
David S. Miller | 1b003be | 2009-06-09 00:22:35 -0700 | [diff] [blame] | 1009 | skb_walk_frags(skb, frag) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | /* NOTE: skb_shinfos are recursive. Although IP returns |
| 1011 | * skb's with only 1 level of fragments, SCTP reassembly can |
| 1012 | * increase the levels. |
| 1013 | */ |
Tsutomu Fujii | d7c2c9e | 2006-06-17 22:58:28 -0700 | [diff] [blame] | 1014 | sctp_ulpevent_release_frag_data(sctp_skb2event(frag)); |
| 1015 | } |
| 1016 | |
| 1017 | done: |
Daniel Borkmann | 362d520 | 2014-04-14 21:45:17 +0200 | [diff] [blame] | 1018 | sctp_assoc_rwnd_increase(event->asoc, len); |
Marcelo Ricardo Leitner | 1f45f78 | 2016-07-13 15:08:57 -0300 | [diff] [blame] | 1019 | sctp_chunk_put(event->chunk); |
Tsutomu Fujii | d7c2c9e | 2006-06-17 22:58:28 -0700 | [diff] [blame] | 1020 | sctp_ulpevent_release_owner(event); |
| 1021 | } |
| 1022 | |
| 1023 | static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event) |
| 1024 | { |
| 1025 | struct sk_buff *skb, *frag; |
| 1026 | |
| 1027 | skb = sctp_event2skb(event); |
| 1028 | |
| 1029 | if (!skb->data_len) |
| 1030 | goto done; |
| 1031 | |
| 1032 | /* Don't forget the fragments. */ |
David S. Miller | 1b003be | 2009-06-09 00:22:35 -0700 | [diff] [blame] | 1033 | skb_walk_frags(skb, frag) { |
Tsutomu Fujii | d7c2c9e | 2006-06-17 22:58:28 -0700 | [diff] [blame] | 1034 | /* NOTE: skb_shinfos are recursive. Although IP returns |
| 1035 | * skb's with only 1 level of fragments, SCTP reassembly can |
| 1036 | * increase the levels. |
| 1037 | */ |
| 1038 | sctp_ulpevent_release_frag_data(sctp_skb2event(frag)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | } |
| 1040 | |
| 1041 | done: |
Marcelo Ricardo Leitner | 1f45f78 | 2016-07-13 15:08:57 -0300 | [diff] [blame] | 1042 | sctp_chunk_put(event->chunk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | sctp_ulpevent_release_owner(event); |
| 1044 | } |
| 1045 | |
| 1046 | /* Free a ulpevent that has an owner. It includes releasing the reference |
| 1047 | * to the owner, updating the rwnd in case of a DATA event and freeing the |
| 1048 | * skb. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | */ |
| 1050 | void sctp_ulpevent_free(struct sctp_ulpevent *event) |
| 1051 | { |
| 1052 | if (sctp_ulpevent_is_notification(event)) |
| 1053 | sctp_ulpevent_release_owner(event); |
| 1054 | else |
| 1055 | sctp_ulpevent_release_data(event); |
| 1056 | |
| 1057 | kfree_skb(sctp_event2skb(event)); |
| 1058 | } |
| 1059 | |
| 1060 | /* Purge the skb lists holding ulpevents. */ |
Thomas Graf | cd4fcc7 | 2011-07-08 04:37:46 +0000 | [diff] [blame] | 1061 | unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | { |
| 1063 | struct sk_buff *skb; |
Thomas Graf | cd4fcc7 | 2011-07-08 04:37:46 +0000 | [diff] [blame] | 1064 | unsigned int data_unread = 0; |
| 1065 | |
| 1066 | while ((skb = skb_dequeue(list)) != NULL) { |
| 1067 | struct sctp_ulpevent *event = sctp_skb2event(skb); |
| 1068 | |
| 1069 | if (!sctp_ulpevent_is_notification(event)) |
| 1070 | data_unread += skb->len; |
| 1071 | |
| 1072 | sctp_ulpevent_free(event); |
| 1073 | } |
| 1074 | |
| 1075 | return data_unread; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | } |