160c778b2SVlad Yasevich /* SCTP kernel implementation 21da177e4SLinus Torvalds * (C) Copyright IBM Corp. 2001, 2004 31da177e4SLinus Torvalds * Copyright (c) 1999-2000 Cisco, Inc. 41da177e4SLinus Torvalds * Copyright (c) 1999-2001 Motorola, Inc. 51da177e4SLinus Torvalds * Copyright (c) 2001-2002 Intel Corp. 61da177e4SLinus Torvalds * 760c778b2SVlad Yasevich * This file is part of the SCTP kernel implementation 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * These functions work with the state functions in sctp_sm_statefuns.c 101da177e4SLinus Torvalds * to implement the state operations. These functions implement the 111da177e4SLinus Torvalds * steps which require modifying existing data structures. 121da177e4SLinus Torvalds * 1360c778b2SVlad Yasevich * This SCTP implementation is free software; 141da177e4SLinus Torvalds * you can redistribute it and/or modify it under the terms of 151da177e4SLinus Torvalds * the GNU General Public License as published by 161da177e4SLinus Torvalds * the Free Software Foundation; either version 2, or (at your option) 171da177e4SLinus Torvalds * any later version. 181da177e4SLinus Torvalds * 1960c778b2SVlad Yasevich * This SCTP implementation is distributed in the hope that it 201da177e4SLinus Torvalds * will be useful, but WITHOUT ANY WARRANTY; without even the implied 211da177e4SLinus Torvalds * ************************ 221da177e4SLinus Torvalds * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 231da177e4SLinus Torvalds * See the GNU General Public License for more details. 241da177e4SLinus Torvalds * 251da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 264b2f13a2SJeff Kirsher * along with GNU CC; see the file COPYING. If not, see 274b2f13a2SJeff Kirsher * <http://www.gnu.org/licenses/>. 281da177e4SLinus Torvalds * 291da177e4SLinus Torvalds * Please send any bug reports or fixes you make to the 301da177e4SLinus Torvalds * email address(es): 3191705c61SDaniel Borkmann * lksctp developers <linux-sctp@vger.kernel.org> 321da177e4SLinus Torvalds * 331da177e4SLinus Torvalds * Written or modified by: 341da177e4SLinus Torvalds * La Monte H.P. Yarroll <piggy@acm.org> 351da177e4SLinus Torvalds * Karl Knutson <karl@athena.chicago.il.us> 361da177e4SLinus Torvalds * C. Robin <chris@hundredacre.ac.uk> 371da177e4SLinus Torvalds * Jon Grimm <jgrimm@us.ibm.com> 381da177e4SLinus Torvalds * Xingang Guo <xingang.guo@intel.com> 391da177e4SLinus Torvalds * Dajiang Zhang <dajiang.zhang@nokia.com> 401da177e4SLinus Torvalds * Sridhar Samudrala <sri@us.ibm.com> 411da177e4SLinus Torvalds * Daisy Chang <daisyc@us.ibm.com> 421da177e4SLinus Torvalds * Ardelle Fan <ardelle.fan@intel.com> 431da177e4SLinus Torvalds * Kevin Gao <kevin.gao@intel.com> 441da177e4SLinus Torvalds */ 451da177e4SLinus Torvalds 46145ce502SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 47145ce502SJoe Perches 485821c769SHerbert Xu #include <crypto/hash.h> 491da177e4SLinus Torvalds #include <linux/types.h> 501da177e4SLinus Torvalds #include <linux/kernel.h> 511da177e4SLinus Torvalds #include <linux/ip.h> 521da177e4SLinus Torvalds #include <linux/ipv6.h> 531da177e4SLinus Torvalds #include <linux/net.h> 541da177e4SLinus Torvalds #include <linux/inet.h> 55ebc3bbcfSChristian Borntraeger #include <linux/scatterlist.h> 565a0e3ad6STejun Heo #include <linux/slab.h> 571da177e4SLinus Torvalds #include <net/sock.h> 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds #include <linux/skbuff.h> 601da177e4SLinus Torvalds #include <linux/random.h> /* for get_random_bytes */ 611da177e4SLinus Torvalds #include <net/sctp/sctp.h> 621da177e4SLinus Torvalds #include <net/sctp/sm.h> 631da177e4SLinus Torvalds 64072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 65cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 66cea8768fSMarcelo Ricardo Leitner gfp_t gfp); 67072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 68cea8768fSMarcelo Ricardo Leitner __u8 flags, int paylen, gfp_t gfp); 69072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 70cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 71cea8768fSMarcelo Ricardo Leitner gfp_t gfp); 72f48ef4c7SXin Long static struct sctp_cookie_param *sctp_pack_cookie( 73f48ef4c7SXin Long const struct sctp_endpoint *ep, 741da177e4SLinus Torvalds const struct sctp_association *asoc, 751da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 761da177e4SLinus Torvalds int *cookie_len, 771da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len); 781da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 791da177e4SLinus Torvalds union sctp_params param, 801da177e4SLinus Torvalds const union sctp_addr *peer_addr, 81dd0fc66fSAl Viro gfp_t gfp); 828ee4be37SVlad Yasevich static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 838ee4be37SVlad Yasevich const void *data); 841da177e4SLinus Torvalds 85072017b4SVlad Yasevich /* Control chunk destructor */ 86072017b4SVlad Yasevich static void sctp_control_release_owner(struct sk_buff *skb) 87072017b4SVlad Yasevich { 881b1e0bc9SXin Long struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg; 891b1e0bc9SXin Long 90ec2e506cSXin Long if (chunk->shkey) { 91ec2e506cSXin Long struct sctp_shared_key *shkey = chunk->shkey; 92ec2e506cSXin Long struct sctp_association *asoc = chunk->asoc; 93ec2e506cSXin Long 94ec2e506cSXin Long /* refcnt == 2 and !list_empty mean after this release, it's 95ec2e506cSXin Long * not being used anywhere, and it's time to notify userland 96ec2e506cSXin Long * that this shkey can be freed if it's been deactivated. 97ec2e506cSXin Long */ 98ec2e506cSXin Long if (shkey->deactivated && !list_empty(&shkey->key_list) && 99ec2e506cSXin Long refcount_read(&shkey->refcnt) == 2) { 100ec2e506cSXin Long struct sctp_ulpevent *ev; 101ec2e506cSXin Long 102ec2e506cSXin Long ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id, 103ec2e506cSXin Long SCTP_AUTH_FREE_KEY, 104ec2e506cSXin Long GFP_KERNEL); 105ec2e506cSXin Long if (ev) 106ec2e506cSXin Long asoc->stream.si->enqueue_event(&asoc->ulpq, ev); 107ec2e506cSXin Long } 1081b1e0bc9SXin Long sctp_auth_shkey_release(chunk->shkey); 109072017b4SVlad Yasevich } 110ec2e506cSXin Long } 111072017b4SVlad Yasevich 112072017b4SVlad Yasevich static void sctp_control_set_owner_w(struct sctp_chunk *chunk) 113072017b4SVlad Yasevich { 114072017b4SVlad Yasevich struct sctp_association *asoc = chunk->asoc; 115072017b4SVlad Yasevich struct sk_buff *skb = chunk->skb; 116072017b4SVlad Yasevich 117072017b4SVlad Yasevich /* TODO: properly account for control chunks. 118072017b4SVlad Yasevich * To do it right we'll need: 119072017b4SVlad Yasevich * 1) endpoint if association isn't known. 120072017b4SVlad Yasevich * 2) proper memory accounting. 121072017b4SVlad Yasevich * 122072017b4SVlad Yasevich * For now don't do anything for now. 123072017b4SVlad Yasevich */ 1241b1e0bc9SXin Long if (chunk->auth) { 1251b1e0bc9SXin Long chunk->shkey = asoc->shkey; 1261b1e0bc9SXin Long sctp_auth_shkey_hold(chunk->shkey); 1271b1e0bc9SXin Long } 128072017b4SVlad Yasevich skb->sk = asoc ? asoc->base.sk : NULL; 1291b1e0bc9SXin Long skb_shinfo(skb)->destructor_arg = chunk; 130072017b4SVlad Yasevich skb->destructor = sctp_control_release_owner; 131072017b4SVlad Yasevich } 132072017b4SVlad Yasevich 1331da177e4SLinus Torvalds /* What was the inbound interface for this chunk? */ 1341da177e4SLinus Torvalds int sctp_chunk_iif(const struct sctp_chunk *chunk) 1351da177e4SLinus Torvalds { 136e7487c86SMarcelo Ricardo Leitner struct sk_buff *skb = chunk->skb; 1371da177e4SLinus Torvalds 138e7487c86SMarcelo Ricardo Leitner return SCTP_INPUT_CB(skb)->af->skb_iif(skb); 1391da177e4SLinus Torvalds } 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 1421da177e4SLinus Torvalds * 1431da177e4SLinus Torvalds * Note 2: The ECN capable field is reserved for future use of 1441da177e4SLinus Torvalds * Explicit Congestion Notification. 1451da177e4SLinus Torvalds */ 1461da177e4SLinus Torvalds static const struct sctp_paramhdr ecap_param = { 1471da177e4SLinus Torvalds SCTP_PARAM_ECN_CAPABLE, 14809640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1491da177e4SLinus Torvalds }; 1501da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1511da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 15209640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1531da177e4SLinus Torvalds }; 1541da177e4SLinus Torvalds 1558914f4baSMarcelo Ricardo Leitner /* A helper to initialize an op error inside a provided chunk, as most 1568914f4baSMarcelo Ricardo Leitner * cause codes will be embedded inside an abort chunk. 1571da177e4SLinus Torvalds */ 1586d3e8aa8SMarcelo Ricardo Leitner int sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, 15900f1c2dfSWei Yongjun size_t paylen) 1601da177e4SLinus Torvalds { 161d8238d9dSXin Long struct sctp_errhdr err; 1621da177e4SLinus Torvalds __u16 len; 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds /* Cause code constants are now defined in network order. */ 1651da177e4SLinus Torvalds err.cause = cause_code; 166d8238d9dSXin Long len = sizeof(err) + paylen; 1671da177e4SLinus Torvalds err.length = htons(len); 1686d3e8aa8SMarcelo Ricardo Leitner 1696d3e8aa8SMarcelo Ricardo Leitner if (skb_tailroom(chunk->skb) < len) 1706d3e8aa8SMarcelo Ricardo Leitner return -ENOSPC; 1716d3e8aa8SMarcelo Ricardo Leitner 172d8238d9dSXin Long chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(err), &err); 1736d3e8aa8SMarcelo Ricardo Leitner 1746d3e8aa8SMarcelo Ricardo Leitner return 0; 1751da177e4SLinus Torvalds } 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds /* 3.3.2 Initiation (INIT) (1) 1781da177e4SLinus Torvalds * 1791da177e4SLinus Torvalds * This chunk is used to initiate a SCTP association between two 1801da177e4SLinus Torvalds * endpoints. The format of the INIT chunk is shown below: 1811da177e4SLinus Torvalds * 1821da177e4SLinus Torvalds * 0 1 2 3 1831da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 1841da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1851da177e4SLinus Torvalds * | Type = 1 | Chunk Flags | Chunk Length | 1861da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1871da177e4SLinus Torvalds * | Initiate Tag | 1881da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1891da177e4SLinus Torvalds * | Advertised Receiver Window Credit (a_rwnd) | 1901da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1911da177e4SLinus Torvalds * | Number of Outbound Streams | Number of Inbound Streams | 1921da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1931da177e4SLinus Torvalds * | Initial TSN | 1941da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1951da177e4SLinus Torvalds * \ \ 1961da177e4SLinus Torvalds * / Optional/Variable-Length Parameters / 1971da177e4SLinus Torvalds * \ \ 1981da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1991da177e4SLinus Torvalds * 2001da177e4SLinus Torvalds * 2011da177e4SLinus Torvalds * The INIT chunk contains the following parameters. Unless otherwise 2021da177e4SLinus Torvalds * noted, each parameter MUST only be included once in the INIT chunk. 2031da177e4SLinus Torvalds * 2041da177e4SLinus Torvalds * Fixed Parameters Status 2051da177e4SLinus Torvalds * ---------------------------------------------- 2061da177e4SLinus Torvalds * Initiate Tag Mandatory 2071da177e4SLinus Torvalds * Advertised Receiver Window Credit Mandatory 2081da177e4SLinus Torvalds * Number of Outbound Streams Mandatory 2091da177e4SLinus Torvalds * Number of Inbound Streams Mandatory 2101da177e4SLinus Torvalds * Initial TSN Mandatory 2111da177e4SLinus Torvalds * 2121da177e4SLinus Torvalds * Variable Parameters Status Type Value 2131da177e4SLinus Torvalds * ------------------------------------------------------------- 2141da177e4SLinus Torvalds * IPv4 Address (Note 1) Optional 5 2151da177e4SLinus Torvalds * IPv6 Address (Note 1) Optional 6 2161da177e4SLinus Torvalds * Cookie Preservative Optional 9 2171da177e4SLinus Torvalds * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) 2181da177e4SLinus Torvalds * Host Name Address (Note 3) Optional 11 2191da177e4SLinus Torvalds * Supported Address Types (Note 4) Optional 12 2201da177e4SLinus Torvalds */ 2211da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, 2221da177e4SLinus Torvalds const struct sctp_bind_addr *bp, 223dd0fc66fSAl Viro gfp_t gfp, int vparam_len) 2241da177e4SLinus Torvalds { 225e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 226327c0dabSXin Long struct sctp_supported_ext_param ext_param; 227327c0dabSXin Long struct sctp_adaptation_ind_param aiparam; 228327c0dabSXin Long struct sctp_paramhdr *auth_chunks = NULL; 229327c0dabSXin Long struct sctp_paramhdr *auth_hmacs = NULL; 230327c0dabSXin Long struct sctp_supported_addrs_param sat; 231b14878ccSVlad Yasevich struct sctp_endpoint *ep = asoc->ep; 2321da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 2331da177e4SLinus Torvalds int num_types, addrs_len = 0; 234327c0dabSXin Long struct sctp_inithdr init; 235327c0dabSXin Long union sctp_params addrs; 2361da177e4SLinus Torvalds struct sctp_sock *sp; 23796b120b3SXin Long __u8 extensions[5]; 238327c0dabSXin Long size_t chunksize; 239327c0dabSXin Long __be16 types[2]; 240327c0dabSXin Long int num_ext = 0; 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2431da177e4SLinus Torvalds * 2441da177e4SLinus Torvalds * Note 1: The INIT chunks can contain multiple addresses that 2451da177e4SLinus Torvalds * can be IPv4 and/or IPv6 in any combination. 2461da177e4SLinus Torvalds */ 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds /* Convert the provided bind address list to raw format. */ 2491da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds init.init_tag = htonl(asoc->c.my_vtag); 2521da177e4SLinus Torvalds init.a_rwnd = htonl(asoc->rwnd); 2531da177e4SLinus Torvalds init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2541da177e4SLinus Torvalds init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2551da177e4SLinus Torvalds init.initial_tsn = htonl(asoc->c.initial_tsn); 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds /* How many address types are needed? */ 2581da177e4SLinus Torvalds sp = sctp_sk(asoc->base.sk); 2591da177e4SLinus Torvalds num_types = sp->pf->supported_addrs(sp, types); 2601da177e4SLinus Torvalds 261a8170c35SWei Yongjun chunksize = sizeof(init) + addrs_len; 262e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types)); 2631da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 2648ee4be37SVlad Yasevich 26528aa4c26SXin Long if (asoc->prsctp_enable) 266036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 267036b579bSVlad Yasevich 268131a47e3SVlad Yasevich /* ADDIP: Section 4.2.7: 269131a47e3SVlad Yasevich * An implementation supporting this extension [ADDIP] MUST list 270131a47e3SVlad Yasevich * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and 271131a47e3SVlad Yasevich * INIT-ACK parameters. 272131a47e3SVlad Yasevich */ 273e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) { 274131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 275131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 276131a47e3SVlad Yasevich num_ext += 2; 277131a47e3SVlad Yasevich } 278131a47e3SVlad Yasevich 279c28445c3SXin Long if (asoc->reconf_enable) { 280c28445c3SXin Long extensions[num_ext] = SCTP_CID_RECONF; 281c28445c3SXin Long num_ext += 1; 282c28445c3SXin Long } 283c28445c3SXin Long 2846fc791eeSmalc if (sp->adaptation_ind) 2851da177e4SLinus Torvalds chunksize += sizeof(aiparam); 2866fc791eeSmalc 28796b120b3SXin Long if (sp->strm_interleave) { 28896b120b3SXin Long extensions[num_ext] = SCTP_CID_I_DATA; 28996b120b3SXin Long num_ext += 1; 29096b120b3SXin Long } 29196b120b3SXin Long 2921da177e4SLinus Torvalds chunksize += vparam_len; 2931da177e4SLinus Torvalds 294730fc3d0SVlad Yasevich /* Account for AUTH related parameters */ 295b14878ccSVlad Yasevich if (ep->auth_enable) { 296730fc3d0SVlad Yasevich /* Add random parameter length*/ 297730fc3d0SVlad Yasevich chunksize += sizeof(asoc->c.auth_random); 298730fc3d0SVlad Yasevich 299730fc3d0SVlad Yasevich /* Add HMACS parameter length if any were defined */ 3003c918704SXin Long auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs; 301730fc3d0SVlad Yasevich if (auth_hmacs->length) 302e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); 303730fc3d0SVlad Yasevich else 304730fc3d0SVlad Yasevich auth_hmacs = NULL; 305730fc3d0SVlad Yasevich 306730fc3d0SVlad Yasevich /* Add CHUNKS parameter length */ 3073c918704SXin Long auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks; 308730fc3d0SVlad Yasevich if (auth_chunks->length) 309e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); 310730fc3d0SVlad Yasevich else 3119baffaa6SVlad Yasevich auth_chunks = NULL; 312730fc3d0SVlad Yasevich 313730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 314730fc3d0SVlad Yasevich num_ext += 1; 315730fc3d0SVlad Yasevich } 316730fc3d0SVlad Yasevich 317131a47e3SVlad Yasevich /* If we have any extensions to report, account for that */ 318131a47e3SVlad Yasevich if (num_ext) 31915328d9fSXin Long chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext); 320131a47e3SVlad Yasevich 3211da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3221da177e4SLinus Torvalds * 3231da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 3241da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 3251da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 3261da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 3271da177e4SLinus Torvalds * other address types if the Host Name address parameter is 3281da177e4SLinus Torvalds * present in the received INIT chunk. 3291da177e4SLinus Torvalds * 3301da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 3311da177e4SLinus Torvalds */ 3321da177e4SLinus Torvalds 333cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp); 3341da177e4SLinus Torvalds if (!retval) 3351da177e4SLinus Torvalds goto nodata; 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds retval->subh.init_hdr = 3381da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 3391da177e4SLinus Torvalds retval->param_hdr.v = 3401da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3431da177e4SLinus Torvalds * 3441da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 3451da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 3461da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 3471da177e4SLinus Torvalds * support any address type. 3481da177e4SLinus Torvalds */ 3491da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 3501da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 3511da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 3521da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 355131a47e3SVlad Yasevich 3567aa1b54bSJoe Perches /* Add the supported extensions parameter. Be nice and add this 357131a47e3SVlad Yasevich * fist before addiding the parameters for the extensions themselves 358131a47e3SVlad Yasevich */ 359131a47e3SVlad Yasevich if (num_ext) { 360131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 36115328d9fSXin Long ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext); 36215328d9fSXin Long sctp_addto_chunk(retval, sizeof(ext_param), &ext_param); 3638ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 364131a47e3SVlad Yasevich } 365131a47e3SVlad Yasevich 36628aa4c26SXin Long if (asoc->prsctp_enable) 3671da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 368131a47e3SVlad Yasevich 3696fc791eeSmalc if (sp->adaptation_ind) { 3700f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 3711da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3720f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sp->adaptation_ind); 3731da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 3746fc791eeSmalc } 375131a47e3SVlad Yasevich 376730fc3d0SVlad Yasevich /* Add SCTP-AUTH chunks to the parameter list */ 377b14878ccSVlad Yasevich if (ep->auth_enable) { 378730fc3d0SVlad Yasevich sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), 379730fc3d0SVlad Yasevich asoc->c.auth_random); 380730fc3d0SVlad Yasevich if (auth_hmacs) 381730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 382730fc3d0SVlad Yasevich auth_hmacs); 383730fc3d0SVlad Yasevich if (auth_chunks) 384730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 385730fc3d0SVlad Yasevich auth_chunks); 386730fc3d0SVlad Yasevich } 3871da177e4SLinus Torvalds nodata: 3881da177e4SLinus Torvalds kfree(addrs.v); 3891da177e4SLinus Torvalds return retval; 3901da177e4SLinus Torvalds } 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 3931da177e4SLinus Torvalds const struct sctp_chunk *chunk, 394dd0fc66fSAl Viro gfp_t gfp, int unkparam_len) 3951da177e4SLinus Torvalds { 396327c0dabSXin Long struct sctp_supported_ext_param ext_param; 397327c0dabSXin Long struct sctp_adaptation_ind_param aiparam; 398327c0dabSXin Long struct sctp_paramhdr *auth_chunks = NULL; 399327c0dabSXin Long struct sctp_paramhdr *auth_random = NULL; 400327c0dabSXin Long struct sctp_paramhdr *auth_hmacs = NULL; 401327c0dabSXin Long struct sctp_chunk *retval = NULL; 402327c0dabSXin Long struct sctp_cookie_param *cookie; 4034ae70c08SXin Long struct sctp_inithdr initack; 4041da177e4SLinus Torvalds union sctp_params addrs; 4056fc791eeSmalc struct sctp_sock *sp; 40696b120b3SXin Long __u8 extensions[5]; 407327c0dabSXin Long size_t chunksize; 408327c0dabSXin Long int num_ext = 0; 409327c0dabSXin Long int cookie_len; 410327c0dabSXin Long int addrs_len; 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 4131da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 4161da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 4171da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 4181da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 4191da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 4221da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 4231da177e4SLinus Torvalds */ 4241da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 4251da177e4SLinus Torvalds addrs.v, addrs_len); 4261da177e4SLinus Torvalds if (!cookie) 4271da177e4SLinus Torvalds goto nomem_cookie; 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 4301da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 4311da177e4SLinus Torvalds */ 4326fc791eeSmalc sp = sctp_sk(asoc->base.sk); 4331da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 4361da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4371da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 4381da177e4SLinus Torvalds 4395ffad5acSWei Yongjun if (asoc->peer.prsctp_capable) 440036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 441036b579bSVlad Yasevich 4425ffad5acSWei Yongjun if (asoc->peer.asconf_capable) { 443131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 444131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 445131a47e3SVlad Yasevich num_ext += 2; 446131a47e3SVlad Yasevich } 447131a47e3SVlad Yasevich 448c28445c3SXin Long if (asoc->peer.reconf_capable) { 449c28445c3SXin Long extensions[num_ext] = SCTP_CID_RECONF; 450c28445c3SXin Long num_ext += 1; 451c28445c3SXin Long } 452c28445c3SXin Long 4536fc791eeSmalc if (sp->adaptation_ind) 4541da177e4SLinus Torvalds chunksize += sizeof(aiparam); 4551da177e4SLinus Torvalds 45696b120b3SXin Long if (asoc->intl_enable) { 45796b120b3SXin Long extensions[num_ext] = SCTP_CID_I_DATA; 45896b120b3SXin Long num_ext += 1; 45996b120b3SXin Long } 46096b120b3SXin Long 461730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 4623c918704SXin Long auth_random = (struct sctp_paramhdr *)asoc->c.auth_random; 463730fc3d0SVlad Yasevich chunksize += ntohs(auth_random->length); 464730fc3d0SVlad Yasevich 4653c918704SXin Long auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs; 466730fc3d0SVlad Yasevich if (auth_hmacs->length) 467e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); 468730fc3d0SVlad Yasevich else 469730fc3d0SVlad Yasevich auth_hmacs = NULL; 470730fc3d0SVlad Yasevich 4713c918704SXin Long auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks; 472730fc3d0SVlad Yasevich if (auth_chunks->length) 473e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); 474730fc3d0SVlad Yasevich else 475730fc3d0SVlad Yasevich auth_chunks = NULL; 476730fc3d0SVlad Yasevich 477730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 478730fc3d0SVlad Yasevich num_ext += 1; 479730fc3d0SVlad Yasevich } 480730fc3d0SVlad Yasevich 4818ee4be37SVlad Yasevich if (num_ext) 48215328d9fSXin Long chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext); 4838ee4be37SVlad Yasevich 4841da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 485cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp); 4861da177e4SLinus Torvalds if (!retval) 4871da177e4SLinus Torvalds goto nomem_chunk; 4881da177e4SLinus Torvalds 489b99a4d53SDan Carpenter /* RFC 2960 6.4 Multi-homed SCTP Endpoints 490b99a4d53SDan Carpenter * 491b99a4d53SDan Carpenter * An endpoint SHOULD transmit reply chunks (e.g., SACK, 492b99a4d53SDan Carpenter * HEARTBEAT ACK, * etc.) to the same destination transport 493b99a4d53SDan Carpenter * address from which it received the DATA or control chunk 494b99a4d53SDan Carpenter * to which it is replying. 495b99a4d53SDan Carpenter * 496b99a4d53SDan Carpenter * [INIT ACK back to where the INIT came from.] 4971da177e4SLinus Torvalds */ 4981da177e4SLinus Torvalds retval->transport = chunk->transport; 499b99a4d53SDan Carpenter 5001da177e4SLinus Torvalds retval->subh.init_hdr = 5011da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 5021da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 5031da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5041da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 5051da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 506131a47e3SVlad Yasevich if (num_ext) { 507131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 50815328d9fSXin Long ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext); 50915328d9fSXin Long sctp_addto_chunk(retval, sizeof(ext_param), &ext_param); 5108ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 511131a47e3SVlad Yasevich } 5121da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 5131da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 5141da177e4SLinus Torvalds 5156fc791eeSmalc if (sp->adaptation_ind) { 5160f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 5171da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 5186fc791eeSmalc aiparam.adaptation_ind = htonl(sp->adaptation_ind); 5191da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 5206fc791eeSmalc } 5211da177e4SLinus Torvalds 522730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 523730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_random->length), 524730fc3d0SVlad Yasevich auth_random); 525730fc3d0SVlad Yasevich if (auth_hmacs) 526730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 527730fc3d0SVlad Yasevich auth_hmacs); 528730fc3d0SVlad Yasevich if (auth_chunks) 529730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 530730fc3d0SVlad Yasevich auth_chunks); 531730fc3d0SVlad Yasevich } 532730fc3d0SVlad Yasevich 5331da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 5341da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds nomem_chunk: 5371da177e4SLinus Torvalds kfree(cookie); 5381da177e4SLinus Torvalds nomem_cookie: 5391da177e4SLinus Torvalds kfree(addrs.v); 5401da177e4SLinus Torvalds return retval; 5411da177e4SLinus Torvalds } 5421da177e4SLinus Torvalds 5431da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 5441da177e4SLinus Torvalds * 5451da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 5461da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 5471da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 5481da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 5491da177e4SLinus Torvalds * chunks in the same packet. 5501da177e4SLinus Torvalds * 5511da177e4SLinus Torvalds * 0 1 2 3 5521da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 5531da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5541da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 5551da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5561da177e4SLinus Torvalds * / Cookie / 5571da177e4SLinus Torvalds * \ \ 5581da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5591da177e4SLinus Torvalds * 5601da177e4SLinus Torvalds * Chunk Flags: 8 bit 5611da177e4SLinus Torvalds * 5621da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5631da177e4SLinus Torvalds * 5641da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 5651da177e4SLinus Torvalds * 5661da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 5671da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 5681da177e4SLinus Torvalds * 5691da177e4SLinus Torvalds * Cookie: variable size 5701da177e4SLinus Torvalds * 5711da177e4SLinus Torvalds * This field must contain the exact cookie received in the 5721da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 5731da177e4SLinus Torvalds * 5741da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 5751da177e4SLinus Torvalds * to insure interoperability. 5761da177e4SLinus Torvalds */ 5771da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 5781da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5791da177e4SLinus Torvalds { 5801da177e4SLinus Torvalds struct sctp_chunk *retval; 5811da177e4SLinus Torvalds int cookie_len; 582327c0dabSXin Long void *cookie; 5831da177e4SLinus Torvalds 5841da177e4SLinus Torvalds cookie = asoc->peer.cookie; 5851da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 5861da177e4SLinus Torvalds 5871da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 588cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, 589cea8768fSMarcelo Ricardo Leitner cookie_len, GFP_ATOMIC); 5901da177e4SLinus Torvalds if (!retval) 5911da177e4SLinus Torvalds goto nodata; 5921da177e4SLinus Torvalds retval->subh.cookie_hdr = 5931da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5961da177e4SLinus Torvalds * 5971da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5981da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5991da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6001da177e4SLinus Torvalds * to which it is replying. 6011da177e4SLinus Torvalds * 6021da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 6031da177e4SLinus Torvalds */ 6041da177e4SLinus Torvalds if (chunk) 6051da177e4SLinus Torvalds retval->transport = chunk->transport; 6061da177e4SLinus Torvalds 6071da177e4SLinus Torvalds nodata: 6081da177e4SLinus Torvalds return retval; 6091da177e4SLinus Torvalds } 6101da177e4SLinus Torvalds 6111da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 6121da177e4SLinus Torvalds * 6131da177e4SLinus Torvalds * This chunk is used only during the initialization of an 6141da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 6151da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 6161da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 6171da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 6181da177e4SLinus Torvalds * 6191da177e4SLinus Torvalds * 0 1 2 3 6201da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 6211da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6221da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 6231da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6241da177e4SLinus Torvalds * 6251da177e4SLinus Torvalds * Chunk Flags: 8 bits 6261da177e4SLinus Torvalds * 6271da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 6281da177e4SLinus Torvalds */ 6291da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 6301da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6311da177e4SLinus Torvalds { 6321da177e4SLinus Torvalds struct sctp_chunk *retval; 6331da177e4SLinus Torvalds 634cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC); 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6371da177e4SLinus Torvalds * 6381da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6391da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6401da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6411da177e4SLinus Torvalds * to which it is replying. 6421da177e4SLinus Torvalds * 6431da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 6441da177e4SLinus Torvalds */ 6451da177e4SLinus Torvalds if (retval && chunk) 6461da177e4SLinus Torvalds retval->transport = chunk->transport; 6471da177e4SLinus Torvalds 6481da177e4SLinus Torvalds return retval; 6491da177e4SLinus Torvalds } 6501da177e4SLinus Torvalds 6511da177e4SLinus Torvalds /* 6521da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 6531da177e4SLinus Torvalds * CWR: 6541da177e4SLinus Torvalds * 6551da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 6561da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 6571da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 6581da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 6591da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 6601da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 6611da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 6621da177e4SLinus Torvalds * CE bit. 6631da177e4SLinus Torvalds * 6641da177e4SLinus Torvalds * 0 1 2 3 6651da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 6661da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6671da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 6681da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6691da177e4SLinus Torvalds * | Lowest TSN Number | 6701da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6711da177e4SLinus Torvalds * 6721da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 6731da177e4SLinus Torvalds */ 6741da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 6751da177e4SLinus Torvalds const __u32 lowest_tsn, 6761da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6771da177e4SLinus Torvalds { 6781da177e4SLinus Torvalds struct sctp_chunk *retval; 67965f77105SXin Long struct sctp_cwrhdr cwr; 6801da177e4SLinus Torvalds 6811da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 682072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, 68365f77105SXin Long sizeof(cwr), GFP_ATOMIC); 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds if (!retval) 6861da177e4SLinus Torvalds goto nodata; 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 6891da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 6901da177e4SLinus Torvalds 6911da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6921da177e4SLinus Torvalds * 6931da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6941da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6951da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6961da177e4SLinus Torvalds * to which it is replying. 6971da177e4SLinus Torvalds * 6981da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 6991da177e4SLinus Torvalds * came from.] 7001da177e4SLinus Torvalds */ 7011da177e4SLinus Torvalds if (chunk) 7021da177e4SLinus Torvalds retval->transport = chunk->transport; 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds nodata: 7051da177e4SLinus Torvalds return retval; 7061da177e4SLinus Torvalds } 7071da177e4SLinus Torvalds 7081da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 7091da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 7101da177e4SLinus Torvalds const __u32 lowest_tsn) 7111da177e4SLinus Torvalds { 7121da177e4SLinus Torvalds struct sctp_chunk *retval; 7131fb6d83bSXin Long struct sctp_ecnehdr ecne; 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 716072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, 7171fb6d83bSXin Long sizeof(ecne), GFP_ATOMIC); 7181da177e4SLinus Torvalds if (!retval) 7191da177e4SLinus Torvalds goto nodata; 7201da177e4SLinus Torvalds retval->subh.ecne_hdr = 7211da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds nodata: 7241da177e4SLinus Torvalds return retval; 7251da177e4SLinus Torvalds } 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 7281da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 7291da177e4SLinus Torvalds */ 7300c3f6f65SXin Long struct sctp_chunk *sctp_make_datafrag_empty(const struct sctp_association *asoc, 7311da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 7320c3f6f65SXin Long int len, __u8 flags, gfp_t gfp) 7331da177e4SLinus Torvalds { 7341da177e4SLinus Torvalds struct sctp_chunk *retval; 7351da177e4SLinus Torvalds struct sctp_datahdr dp; 7361da177e4SLinus Torvalds 7371da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 7381da177e4SLinus Torvalds * creating the chunk. 7391da177e4SLinus Torvalds */ 7400c3f6f65SXin Long memset(&dp, 0, sizeof(dp)); 7411da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 7420c3f6f65SXin Long dp.stream = htons(sinfo->sinfo_stream); 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 7450c3f6f65SXin Long if (sinfo->sinfo_flags & SCTP_UNORDERED) 7461da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 7471da177e4SLinus Torvalds 7480c3f6f65SXin Long retval = sctp_make_data(asoc, flags, sizeof(dp) + len, gfp); 7491da177e4SLinus Torvalds if (!retval) 7500c3f6f65SXin Long return NULL; 7511da177e4SLinus Torvalds 7521da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 7531da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 7541da177e4SLinus Torvalds 7551da177e4SLinus Torvalds return retval; 7561da177e4SLinus Torvalds } 7571da177e4SLinus Torvalds 7581da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 7591da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 7601da177e4SLinus Torvalds * including duplicates and gaps. 7611da177e4SLinus Torvalds */ 76247b3ba51SMarcelo Ricardo Leitner struct sctp_chunk *sctp_make_sack(struct sctp_association *asoc) 7631da177e4SLinus Torvalds { 764327c0dabSXin Long struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 765327c0dabSXin Long struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; 766327c0dabSXin Long __u16 num_gabs, num_dup_tsns; 767327c0dabSXin Long struct sctp_transport *trans; 7681da177e4SLinus Torvalds struct sctp_chunk *retval; 7691da177e4SLinus Torvalds struct sctp_sackhdr sack; 7701da177e4SLinus Torvalds __u32 ctsn; 771327c0dabSXin Long int len; 7721da177e4SLinus Torvalds 77302015180SVlad Yasevich memset(gabs, 0, sizeof(gabs)); 7741da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 775bb33381dSDaniel Borkmann 776bb33381dSDaniel Borkmann pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn); 7771da177e4SLinus Torvalds 7781da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 77902015180SVlad Yasevich num_gabs = sctp_tsnmap_num_gabs(map, gabs); 7801da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 7811da177e4SLinus Torvalds 7821da177e4SLinus Torvalds /* Initialize the SACK header. */ 7831da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 7841da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 7851da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 7861da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds len = sizeof(sack) 7891da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 7901da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 7911da177e4SLinus Torvalds 7921da177e4SLinus Torvalds /* Create the chunk. */ 793cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC); 7941da177e4SLinus Torvalds if (!retval) 7951da177e4SLinus Torvalds goto nodata; 7961da177e4SLinus Torvalds 7971da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7981da177e4SLinus Torvalds * 7991da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8001da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 8011da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 8021da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 8031da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 8041da177e4SLinus Torvalds * reply chunk. 8051da177e4SLinus Torvalds * 8061da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 8071da177e4SLinus Torvalds * in packets from different source addresses in a single 8081da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 8091da177e4SLinus Torvalds * destination transport addresses from which the DATA or 8101da177e4SLinus Torvalds * control chunks being acknowledged were received. 8111da177e4SLinus Torvalds * 8121da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 8131da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 8141da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 8151da177e4SLinus Torvalds * duplicates. --piggy] 8161da177e4SLinus Torvalds * 8171da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 8181da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 8191da177e4SLinus Torvalds * destination address and not use the source address of the 8201da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 8211da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 8221da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 8231da177e4SLinus Torvalds * for the SACK is broken. 8241da177e4SLinus Torvalds * 8251da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 8261da177e4SLinus Torvalds */ 8271da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds retval->subh.sack_hdr = 8301da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds /* Add the gap ack block information. */ 8331da177e4SLinus Torvalds if (num_gabs) 8341da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 83502015180SVlad Yasevich gabs); 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 838196d6759SMichele Baldessari if (num_dup_tsns) { 83947b3ba51SMarcelo Ricardo Leitner asoc->stats.idupchunks += num_dup_tsns; 8401da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 8411da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 842196d6759SMichele Baldessari } 8434244854dSNeil Horman /* Once we have a sack generated, check to see what our sack 8444244854dSNeil Horman * generation is, if its 0, reset the transports to 0, and reset 8454244854dSNeil Horman * the association generation to 1 8464244854dSNeil Horman * 8474244854dSNeil Horman * The idea is that zero is never used as a valid generation for the 8484244854dSNeil Horman * association so no transport will match after a wrap event like this, 8494244854dSNeil Horman * Until the next sack 8504244854dSNeil Horman */ 85147b3ba51SMarcelo Ricardo Leitner if (++asoc->peer.sack_generation == 0) { 8524244854dSNeil Horman list_for_each_entry(trans, &asoc->peer.transport_addr_list, 8534244854dSNeil Horman transports) 8544244854dSNeil Horman trans->sack_generation = 0; 85547b3ba51SMarcelo Ricardo Leitner asoc->peer.sack_generation = 1; 8564244854dSNeil Horman } 8571da177e4SLinus Torvalds nodata: 8581da177e4SLinus Torvalds return retval; 8591da177e4SLinus Torvalds } 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 8621da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 8631da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8641da177e4SLinus Torvalds { 865e61e4055SXin Long struct sctp_shutdownhdr shut; 8661da177e4SLinus Torvalds struct sctp_chunk *retval; 8671da177e4SLinus Torvalds __u32 ctsn; 8681da177e4SLinus Torvalds 8691da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 8701da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 8711da177e4SLinus Torvalds 872072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, 873e61e4055SXin Long sizeof(shut), GFP_ATOMIC); 8741da177e4SLinus Torvalds if (!retval) 8751da177e4SLinus Torvalds goto nodata; 8761da177e4SLinus Torvalds 8771da177e4SLinus Torvalds retval->subh.shutdown_hdr = 8781da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 8791da177e4SLinus Torvalds 8801da177e4SLinus Torvalds if (chunk) 8811da177e4SLinus Torvalds retval->transport = chunk->transport; 8821da177e4SLinus Torvalds nodata: 8831da177e4SLinus Torvalds return retval; 8841da177e4SLinus Torvalds } 8851da177e4SLinus Torvalds 8861da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8871da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8881da177e4SLinus Torvalds { 8891da177e4SLinus Torvalds struct sctp_chunk *retval; 8901da177e4SLinus Torvalds 891cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0, 892cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 8931da177e4SLinus Torvalds 8941da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8951da177e4SLinus Torvalds * 8961da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8971da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8981da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8991da177e4SLinus Torvalds * to which it is replying. 9001da177e4SLinus Torvalds * 9011da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 9021da177e4SLinus Torvalds */ 9031da177e4SLinus Torvalds if (retval && chunk) 9041da177e4SLinus Torvalds retval->transport = chunk->transport; 9051da177e4SLinus Torvalds 9061da177e4SLinus Torvalds return retval; 9071da177e4SLinus Torvalds } 9081da177e4SLinus Torvalds 9091da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 9101da177e4SLinus Torvalds const struct sctp_association *asoc, 9111da177e4SLinus Torvalds const struct sctp_chunk *chunk) 9121da177e4SLinus Torvalds { 9131da177e4SLinus Torvalds struct sctp_chunk *retval; 9141da177e4SLinus Torvalds __u8 flags = 0; 9151da177e4SLinus Torvalds 916047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 917047a2428SJerome Forissier * reflected) 918047a2428SJerome Forissier */ 9191da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 9201da177e4SLinus Torvalds 921cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 922cea8768fSMarcelo Ricardo Leitner 0, GFP_ATOMIC); 9231da177e4SLinus Torvalds 9241da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9251da177e4SLinus Torvalds * 9261da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9271da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9281da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9291da177e4SLinus Torvalds * to which it is replying. 9301da177e4SLinus Torvalds * 9311da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 9321da177e4SLinus Torvalds * came from.] 9331da177e4SLinus Torvalds */ 9341da177e4SLinus Torvalds if (retval && chunk) 9351da177e4SLinus Torvalds retval->transport = chunk->transport; 9361da177e4SLinus Torvalds 9371da177e4SLinus Torvalds return retval; 9381da177e4SLinus Torvalds } 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 941047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 9421da177e4SLinus Torvalds */ 9431da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 9441da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9451da177e4SLinus Torvalds const size_t hint) 9461da177e4SLinus Torvalds { 9471da177e4SLinus Torvalds struct sctp_chunk *retval; 9481da177e4SLinus Torvalds __u8 flags = 0; 9491da177e4SLinus Torvalds 950047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 951047a2428SJerome Forissier * an INIT (vtag will be reflected). 952047a2428SJerome Forissier */ 953047a2428SJerome Forissier if (!asoc) { 954047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 955047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 956047a2428SJerome Forissier flags = 0; 957047a2428SJerome Forissier else 958047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 959047a2428SJerome Forissier } 9601da177e4SLinus Torvalds 961cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint, 962cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9651da177e4SLinus Torvalds * 9661da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9671da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9681da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9691da177e4SLinus Torvalds * to which it is replying. 9701da177e4SLinus Torvalds * 9711da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9721da177e4SLinus Torvalds */ 9731da177e4SLinus Torvalds if (retval && chunk) 9741da177e4SLinus Torvalds retval->transport = chunk->transport; 9751da177e4SLinus Torvalds 9761da177e4SLinus Torvalds return retval; 9771da177e4SLinus Torvalds } 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 9801da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 9811da177e4SLinus Torvalds const struct sctp_association *asoc, 982327c0dabSXin Long const struct sctp_chunk *chunk, 983327c0dabSXin Long __u32 tsn) 9841da177e4SLinus Torvalds { 9851da177e4SLinus Torvalds struct sctp_chunk *retval; 9869f81bcd9SAl Viro __be32 payload; 9871da177e4SLinus Torvalds 988d8238d9dSXin Long retval = sctp_make_abort(asoc, chunk, 989d8238d9dSXin Long sizeof(struct sctp_errhdr) + sizeof(tsn)); 9901da177e4SLinus Torvalds 9911da177e4SLinus Torvalds if (!retval) 9921da177e4SLinus Torvalds goto no_mem; 9931da177e4SLinus Torvalds 9941da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 9951da177e4SLinus Torvalds payload = htonl(tsn); 99600f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 99700f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 9981da177e4SLinus Torvalds 9991da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 10001da177e4SLinus Torvalds * 10011da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 10021da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 10031da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 10041da177e4SLinus Torvalds * to which it is replying. 10051da177e4SLinus Torvalds * 10061da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 10071da177e4SLinus Torvalds */ 10081da177e4SLinus Torvalds if (chunk) 10091da177e4SLinus Torvalds retval->transport = chunk->transport; 10101da177e4SLinus Torvalds 10111da177e4SLinus Torvalds no_mem: 10121da177e4SLinus Torvalds return retval; 10131da177e4SLinus Torvalds } 10141da177e4SLinus Torvalds 10151da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 10161da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 10176ce8e9ceSAl Viro struct msghdr *msg, 1018c164a9baSSridhar Samudrala size_t paylen) 10191da177e4SLinus Torvalds { 10201da177e4SLinus Torvalds struct sctp_chunk *retval; 1021c164a9baSSridhar Samudrala void *payload = NULL; 1022c164a9baSSridhar Samudrala int err; 10231da177e4SLinus Torvalds 1024d8238d9dSXin Long retval = sctp_make_abort(asoc, NULL, 1025d8238d9dSXin Long sizeof(struct sctp_errhdr) + paylen); 10261da177e4SLinus Torvalds if (!retval) 10271da177e4SLinus Torvalds goto err_chunk; 10281da177e4SLinus Torvalds 10291da177e4SLinus Torvalds if (paylen) { 10301da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 1031c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 10321da177e4SLinus Torvalds if (!payload) 10331da177e4SLinus Torvalds goto err_payload; 10341da177e4SLinus Torvalds 10356ce8e9ceSAl Viro err = memcpy_from_msg(payload, msg, paylen); 1036c164a9baSSridhar Samudrala if (err < 0) 10371da177e4SLinus Torvalds goto err_copy; 10381da177e4SLinus Torvalds } 10391da177e4SLinus Torvalds 104000f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 104100f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10421da177e4SLinus Torvalds 10431da177e4SLinus Torvalds if (paylen) 10441da177e4SLinus Torvalds kfree(payload); 10451da177e4SLinus Torvalds 10461da177e4SLinus Torvalds return retval; 10471da177e4SLinus Torvalds 10481da177e4SLinus Torvalds err_copy: 10491da177e4SLinus Torvalds kfree(payload); 10501da177e4SLinus Torvalds err_payload: 10511da177e4SLinus Torvalds sctp_chunk_free(retval); 10521da177e4SLinus Torvalds retval = NULL; 10531da177e4SLinus Torvalds err_chunk: 10541da177e4SLinus Torvalds return retval; 10551da177e4SLinus Torvalds } 10561da177e4SLinus Torvalds 10575c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 10585c94bf86SAdrian Bunk * enough. 10595c94bf86SAdrian Bunk */ 10605c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 10615c94bf86SAdrian Bunk const void *data) 10625c94bf86SAdrian Bunk { 10635c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 1064327c0dabSXin Long void *target; 10655c94bf86SAdrian Bunk 10665c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 10675c94bf86SAdrian Bunk 10686383cfb3SVlad Yasevich if (data) 10695c94bf86SAdrian Bunk memcpy(target, data, len); 10706383cfb3SVlad Yasevich else 10716383cfb3SVlad Yasevich memset(target, 0, len); 10725c94bf86SAdrian Bunk 10735c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 10745c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 10755c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 10765c94bf86SAdrian Bunk 10775c94bf86SAdrian Bunk return target; 10785c94bf86SAdrian Bunk } 10795c94bf86SAdrian Bunk 10801da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 10811da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 10821da177e4SLinus Torvalds const struct sctp_association *asoc, 10831da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10841da177e4SLinus Torvalds const __u8 *payload, 10851da177e4SLinus Torvalds const size_t paylen) 10861da177e4SLinus Torvalds { 10871da177e4SLinus Torvalds struct sctp_chunk *retval; 10881da177e4SLinus Torvalds struct sctp_paramhdr phdr; 10891da177e4SLinus Torvalds 1090d8238d9dSXin Long retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) + 1091d8238d9dSXin Long paylen + sizeof(phdr)); 10921da177e4SLinus Torvalds if (!retval) 10931da177e4SLinus Torvalds goto end; 10941da177e4SLinus Torvalds 10953c918704SXin Long sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen + 10963c918704SXin Long sizeof(phdr)); 10971da177e4SLinus Torvalds 10981da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 10991da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 110000f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 11013c918704SXin Long sctp_addto_param(retval, sizeof(phdr), &phdr); 11021da177e4SLinus Torvalds 11031da177e4SLinus Torvalds end: 11041da177e4SLinus Torvalds return retval; 11051da177e4SLinus Torvalds } 11061da177e4SLinus Torvalds 1107ba016670SWei Yongjun struct sctp_chunk *sctp_make_violation_paramlen( 1108ba016670SWei Yongjun const struct sctp_association *asoc, 1109ba016670SWei Yongjun const struct sctp_chunk *chunk, 1110ba016670SWei Yongjun struct sctp_paramhdr *param) 1111ba016670SWei Yongjun { 1112ba016670SWei Yongjun static const char error[] = "The following parameter had invalid length:"; 1113d8238d9dSXin Long size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) + 11143c918704SXin Long sizeof(*param); 1115327c0dabSXin Long struct sctp_chunk *retval; 1116ba016670SWei Yongjun 1117ba016670SWei Yongjun retval = sctp_make_abort(asoc, chunk, payload_len); 1118ba016670SWei Yongjun if (!retval) 1119ba016670SWei Yongjun goto nodata; 1120ba016670SWei Yongjun 1121ba016670SWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, 11223c918704SXin Long sizeof(error) + sizeof(*param)); 1123ba016670SWei Yongjun sctp_addto_chunk(retval, sizeof(error), error); 11243c918704SXin Long sctp_addto_param(retval, sizeof(*param), param); 1125ba016670SWei Yongjun 1126ba016670SWei Yongjun nodata: 1127ba016670SWei Yongjun return retval; 1128ba016670SWei Yongjun } 1129ba016670SWei Yongjun 1130de4594a5SNeil Horman struct sctp_chunk *sctp_make_violation_max_retrans( 1131de4594a5SNeil Horman const struct sctp_association *asoc, 1132de4594a5SNeil Horman const struct sctp_chunk *chunk) 1133de4594a5SNeil Horman { 113439a2d5cbSColin Ian King static const char error[] = "Association exceeded its max_retrans count"; 1135d8238d9dSXin Long size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr); 1136327c0dabSXin Long struct sctp_chunk *retval; 1137de4594a5SNeil Horman 1138de4594a5SNeil Horman retval = sctp_make_abort(asoc, chunk, payload_len); 1139de4594a5SNeil Horman if (!retval) 1140de4594a5SNeil Horman goto nodata; 1141de4594a5SNeil Horman 1142de4594a5SNeil Horman sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); 1143de4594a5SNeil Horman sctp_addto_chunk(retval, sizeof(error), error); 1144de4594a5SNeil Horman 1145de4594a5SNeil Horman nodata: 1146de4594a5SNeil Horman return retval; 1147de4594a5SNeil Horman } 1148de4594a5SNeil Horman 11491da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 11501da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 115192c73af5SWei Yongjun const struct sctp_transport *transport) 11521da177e4SLinus Torvalds { 1153edf903f8SXin Long struct sctp_sender_hb_info hbinfo; 115492c73af5SWei Yongjun struct sctp_chunk *retval; 115592c73af5SWei Yongjun 1156cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, 1157cea8768fSMarcelo Ricardo Leitner sizeof(hbinfo), GFP_ATOMIC); 11581da177e4SLinus Torvalds 11591da177e4SLinus Torvalds if (!retval) 11601da177e4SLinus Torvalds goto nodata; 11611da177e4SLinus Torvalds 116292c73af5SWei Yongjun hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; 1163edf903f8SXin Long hbinfo.param_hdr.length = htons(sizeof(hbinfo)); 116492c73af5SWei Yongjun hbinfo.daddr = transport->ipaddr; 116592c73af5SWei Yongjun hbinfo.sent_at = jiffies; 116692c73af5SWei Yongjun hbinfo.hb_nonce = transport->hb_nonce; 116792c73af5SWei Yongjun 11681da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 11691da177e4SLinus Torvalds * what transport it belongs to. 11701da177e4SLinus Torvalds */ 11711da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 117292c73af5SWei Yongjun retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), 117392c73af5SWei Yongjun &hbinfo); 11741da177e4SLinus Torvalds 11751da177e4SLinus Torvalds nodata: 11761da177e4SLinus Torvalds return retval; 11771da177e4SLinus Torvalds } 11781da177e4SLinus Torvalds 11791da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 11801da177e4SLinus Torvalds const struct sctp_chunk *chunk, 1181327c0dabSXin Long const void *payload, 1182327c0dabSXin Long const size_t paylen) 11831da177e4SLinus Torvalds { 11841da177e4SLinus Torvalds struct sctp_chunk *retval; 11851da177e4SLinus Torvalds 1186cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen, 1187cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 11881da177e4SLinus Torvalds if (!retval) 11891da177e4SLinus Torvalds goto nodata; 11901da177e4SLinus Torvalds 11911da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 11921da177e4SLinus Torvalds 11931da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11941da177e4SLinus Torvalds * 11951da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11961da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 11971da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 11981da177e4SLinus Torvalds * to which it is replying. 11991da177e4SLinus Torvalds * 12001da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 12011da177e4SLinus Torvalds */ 12021da177e4SLinus Torvalds if (chunk) 12031da177e4SLinus Torvalds retval->transport = chunk->transport; 12041da177e4SLinus Torvalds 12051da177e4SLinus Torvalds nodata: 12061da177e4SLinus Torvalds return retval; 12071da177e4SLinus Torvalds } 12081da177e4SLinus Torvalds 12091da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 12101da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 12111da177e4SLinus Torvalds */ 12121da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 12131da177e4SLinus Torvalds const struct sctp_association *asoc, 12141da177e4SLinus Torvalds const struct sctp_chunk *chunk, 12151da177e4SLinus Torvalds size_t size) 12161da177e4SLinus Torvalds { 12171da177e4SLinus Torvalds struct sctp_chunk *retval; 12181da177e4SLinus Torvalds 1219072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, 1220d8238d9dSXin Long sizeof(struct sctp_errhdr) + size, 1221d8238d9dSXin Long GFP_ATOMIC); 12221da177e4SLinus Torvalds if (!retval) 12231da177e4SLinus Torvalds goto nodata; 12241da177e4SLinus Torvalds 12251da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 12261da177e4SLinus Torvalds * 12271da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 12281da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 12291da177e4SLinus Torvalds * address from which it received the DATA or control chunk 12301da177e4SLinus Torvalds * to which it is replying. 12311da177e4SLinus Torvalds * 12321da177e4SLinus Torvalds */ 12331da177e4SLinus Torvalds if (chunk) 12341da177e4SLinus Torvalds retval->transport = chunk->transport; 12351da177e4SLinus Torvalds 12361da177e4SLinus Torvalds nodata: 12371da177e4SLinus Torvalds return retval; 12381da177e4SLinus Torvalds } 12391da177e4SLinus Torvalds 12408914f4baSMarcelo Ricardo Leitner /* Create an Operation Error chunk of a fixed size, specifically, 12418914f4baSMarcelo Ricardo Leitner * min(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) - overheads. 12428914f4baSMarcelo Ricardo Leitner * This is a helper function to allocate an error chunk for for those 12438914f4baSMarcelo Ricardo Leitner * invalid parameter codes in which we may not want to report all the 12448914f4baSMarcelo Ricardo Leitner * errors, if the incoming chunk is large. If it can't fit in a single 12458914f4baSMarcelo Ricardo Leitner * packet, we ignore it. 12465fa782c2SNeil Horman */ 12478914f4baSMarcelo Ricardo Leitner static inline struct sctp_chunk *sctp_make_op_error_limited( 12485fa782c2SNeil Horman const struct sctp_association *asoc, 12495fa782c2SNeil Horman const struct sctp_chunk *chunk) 12505fa782c2SNeil Horman { 12518914f4baSMarcelo Ricardo Leitner size_t size = SCTP_DEFAULT_MAXSEGMENT; 12528914f4baSMarcelo Ricardo Leitner struct sctp_sock *sp = NULL; 12535fa782c2SNeil Horman 12548914f4baSMarcelo Ricardo Leitner if (asoc) { 12558914f4baSMarcelo Ricardo Leitner size = min_t(size_t, size, asoc->pathmtu); 12568914f4baSMarcelo Ricardo Leitner sp = sctp_sk(asoc->base.sk); 12578914f4baSMarcelo Ricardo Leitner } 12588914f4baSMarcelo Ricardo Leitner 12598914f4baSMarcelo Ricardo Leitner size = sctp_mtu_payload(sp, size, sizeof(struct sctp_errhdr)); 12605fa782c2SNeil Horman 12615fa782c2SNeil Horman return sctp_make_op_error_space(asoc, chunk, size); 12625fa782c2SNeil Horman } 12635fa782c2SNeil Horman 12641da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 12651da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 12661da177e4SLinus Torvalds const struct sctp_chunk *chunk, 126763706c5cSAl Viro __be16 cause_code, const void *payload, 12686383cfb3SVlad Yasevich size_t paylen, size_t reserve_tail) 12691da177e4SLinus Torvalds { 12701da177e4SLinus Torvalds struct sctp_chunk *retval; 12711da177e4SLinus Torvalds 12726383cfb3SVlad Yasevich retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); 12731da177e4SLinus Torvalds if (!retval) 12741da177e4SLinus Torvalds goto nodata; 12751da177e4SLinus Torvalds 12766383cfb3SVlad Yasevich sctp_init_cause(retval, cause_code, paylen + reserve_tail); 127700f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 12786383cfb3SVlad Yasevich if (reserve_tail) 12796383cfb3SVlad Yasevich sctp_addto_param(retval, reserve_tail, NULL); 12801da177e4SLinus Torvalds 12811da177e4SLinus Torvalds nodata: 12821da177e4SLinus Torvalds return retval; 12831da177e4SLinus Torvalds } 12841da177e4SLinus Torvalds 12851b1e0bc9SXin Long struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc, 12861b1e0bc9SXin Long __u16 key_id) 12874cd57c80SVlad Yasevich { 12884cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 1289327c0dabSXin Long struct sctp_hmac *hmac_desc; 1290327c0dabSXin Long struct sctp_chunk *retval; 12914cd57c80SVlad Yasevich 12924cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 12934cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 12944cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 12954cd57c80SVlad Yasevich return NULL; 12964cd57c80SVlad Yasevich 1297072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, 129896f7ef4dSXin Long hmac_desc->hmac_len + sizeof(auth_hdr), 1299cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 13004cd57c80SVlad Yasevich if (!retval) 13014cd57c80SVlad Yasevich return NULL; 13024cd57c80SVlad Yasevich 13034cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 13041b1e0bc9SXin Long auth_hdr.shkey_id = htons(key_id); 13054cd57c80SVlad Yasevich 130696f7ef4dSXin Long retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr), 13074cd57c80SVlad Yasevich &auth_hdr); 13084cd57c80SVlad Yasevich 1309594831a8SMarcelo Ricardo Leitner skb_put_zero(retval->skb, hmac_desc->hmac_len); 13104cd57c80SVlad Yasevich 13114cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 13124cd57c80SVlad Yasevich retval->chunk_hdr->length = 13134cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 13144cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 13154cd57c80SVlad Yasevich 13164cd57c80SVlad Yasevich return retval; 13174cd57c80SVlad Yasevich } 13184cd57c80SVlad Yasevich 13194cd57c80SVlad Yasevich 13201da177e4SLinus Torvalds /******************************************************************** 13211da177e4SLinus Torvalds * 2nd Level Abstractions 13221da177e4SLinus Torvalds ********************************************************************/ 13231da177e4SLinus Torvalds 13241da177e4SLinus Torvalds /* Turn an skb into a chunk. 13251da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 13263dc0a548Swangweidong * 13273dc0a548Swangweidong * sctpimpguide-05.txt Section 2.8.2 13283dc0a548Swangweidong * M1) Each time a new DATA chunk is transmitted 13293dc0a548Swangweidong * set the 'TSN.Missing.Report' count for that TSN to 0. The 13303dc0a548Swangweidong * 'TSN.Missing.Report' count will be used to determine missing chunks 13313dc0a548Swangweidong * and when to fast retransmit. 13323dc0a548Swangweidong * 13331da177e4SLinus Torvalds */ 13341da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 13351da177e4SLinus Torvalds const struct sctp_association *asoc, 1336cea8768fSMarcelo Ricardo Leitner struct sock *sk, gfp_t gfp) 13371da177e4SLinus Torvalds { 13381da177e4SLinus Torvalds struct sctp_chunk *retval; 13391da177e4SLinus Torvalds 1340cea8768fSMarcelo Ricardo Leitner retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp); 13411da177e4SLinus Torvalds 13421da177e4SLinus Torvalds if (!retval) 13431da177e4SLinus Torvalds goto nodata; 1344bb33381dSDaniel Borkmann if (!sk) 1345bb33381dSDaniel Borkmann pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); 13461da177e4SLinus Torvalds 134779af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 13481da177e4SLinus Torvalds retval->skb = skb; 13491da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 13501da177e4SLinus Torvalds retval->singleton = 1; 13511da177e4SLinus Torvalds 1352c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 13531da177e4SLinus Torvalds 13541da177e4SLinus Torvalds /* Polish the bead hole. */ 13551da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 13561da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 13571da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 1358e7f02796SReshetova, Elena refcount_set(&retval->refcnt, 1); 13591da177e4SLinus Torvalds 13601da177e4SLinus Torvalds nodata: 13611da177e4SLinus Torvalds return retval; 13621da177e4SLinus Torvalds } 13631da177e4SLinus Torvalds 13641da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 13651da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 13661da177e4SLinus Torvalds union sctp_addr *dest) 13671da177e4SLinus Torvalds { 1368f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 136916b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 13701da177e4SLinus Torvalds } 13711da177e4SLinus Torvalds 13721da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 13731da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 13741da177e4SLinus Torvalds { 13751da177e4SLinus Torvalds /* If we have a known transport, use that. */ 13761da177e4SLinus Torvalds if (chunk->transport) { 13776a1e5f33SAl Viro return &chunk->transport->ipaddr; 13781da177e4SLinus Torvalds } else { 13791da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 13806a1e5f33SAl Viro return &chunk->source; 13811da177e4SLinus Torvalds } 13821da177e4SLinus Torvalds } 13831da177e4SLinus Torvalds 13841da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 13851da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 13861da177e4SLinus Torvalds */ 1387072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 1388cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1389cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 13901da177e4SLinus Torvalds { 1391922dbc5bSXin Long struct sctp_chunkhdr *chunk_hdr; 1392327c0dabSXin Long struct sctp_chunk *retval; 13931da177e4SLinus Torvalds struct sk_buff *skb; 13941da177e4SLinus Torvalds struct sock *sk; 139507f2c7abSAlexey Kodanev int chunklen; 139607f2c7abSAlexey Kodanev 139707f2c7abSAlexey Kodanev chunklen = SCTP_PAD4(sizeof(*chunk_hdr) + paylen); 139807f2c7abSAlexey Kodanev if (chunklen > SCTP_MAX_CHUNK_LEN) 139907f2c7abSAlexey Kodanev goto nodata; 14001da177e4SLinus Torvalds 14011da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 140207f2c7abSAlexey Kodanev skb = alloc_skb(chunklen, gfp); 14031da177e4SLinus Torvalds if (!skb) 14041da177e4SLinus Torvalds goto nodata; 14051da177e4SLinus Torvalds 14061da177e4SLinus Torvalds /* Make room for the chunk header. */ 1407922dbc5bSXin Long chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr)); 14081da177e4SLinus Torvalds chunk_hdr->type = type; 14091da177e4SLinus Torvalds chunk_hdr->flags = flags; 1410922dbc5bSXin Long chunk_hdr->length = htons(sizeof(*chunk_hdr)); 14111da177e4SLinus Torvalds 14121da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 1413cea8768fSMarcelo Ricardo Leitner retval = sctp_chunkify(skb, asoc, sk, gfp); 14141da177e4SLinus Torvalds if (!retval) { 14151da177e4SLinus Torvalds kfree_skb(skb); 14161da177e4SLinus Torvalds goto nodata; 14171da177e4SLinus Torvalds } 14181da177e4SLinus Torvalds 14191da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 1420922dbc5bSXin Long retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr); 14211da177e4SLinus Torvalds 14224cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 14234cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 14244cd57c80SVlad Yasevich retval->auth = 1; 14254cd57c80SVlad Yasevich 14261da177e4SLinus Torvalds return retval; 14271da177e4SLinus Torvalds nodata: 14281da177e4SLinus Torvalds return NULL; 14291da177e4SLinus Torvalds } 14301da177e4SLinus Torvalds 1431072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 1432cea8768fSMarcelo Ricardo Leitner __u8 flags, int paylen, gfp_t gfp) 1433072017b4SVlad Yasevich { 1434cea8768fSMarcelo Ricardo Leitner return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp); 1435072017b4SVlad Yasevich } 1436072017b4SVlad Yasevich 1437ad05a7a0SXin Long struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc, 1438ad05a7a0SXin Long __u8 flags, int paylen, gfp_t gfp) 1439ad05a7a0SXin Long { 1440ad05a7a0SXin Long return _sctp_make_chunk(asoc, SCTP_CID_I_DATA, flags, paylen, gfp); 1441ad05a7a0SXin Long } 1442ad05a7a0SXin Long 1443072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 1444cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1445cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 1446072017b4SVlad Yasevich { 1447cea8768fSMarcelo Ricardo Leitner struct sctp_chunk *chunk; 1448072017b4SVlad Yasevich 1449cea8768fSMarcelo Ricardo Leitner chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp); 1450072017b4SVlad Yasevich if (chunk) 1451072017b4SVlad Yasevich sctp_control_set_owner_w(chunk); 1452072017b4SVlad Yasevich 1453072017b4SVlad Yasevich return chunk; 1454072017b4SVlad Yasevich } 14551da177e4SLinus Torvalds 14561da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 14571da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 14581da177e4SLinus Torvalds { 1459a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1460a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1461a08de64dSVlad Yasevich 1462c485658bSDaniel Borkmann consume_skb(chunk->skb); 1463c485658bSDaniel Borkmann consume_skb(chunk->auth_chunk); 14641da177e4SLinus Torvalds 14651da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 14661da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 14671da177e4SLinus Torvalds } 14681da177e4SLinus Torvalds 14691da177e4SLinus Torvalds /* Possibly, free the chunk. */ 14701da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 14711da177e4SLinus Torvalds { 14721da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 14731da177e4SLinus Torvalds if (chunk->msg) 14741da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 14751da177e4SLinus Torvalds 14761da177e4SLinus Torvalds sctp_chunk_put(chunk); 14771da177e4SLinus Torvalds } 14781da177e4SLinus Torvalds 14791da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 14801da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 14811da177e4SLinus Torvalds { 1482e7f02796SReshetova, Elena refcount_inc(&ch->refcnt); 14831da177e4SLinus Torvalds } 14841da177e4SLinus Torvalds 14851da177e4SLinus Torvalds /* Release a reference to the chunk. */ 14861da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 14871da177e4SLinus Torvalds { 1488e7f02796SReshetova, Elena if (refcount_dec_and_test(&ch->refcnt)) 14891da177e4SLinus Torvalds sctp_chunk_destroy(ch); 14901da177e4SLinus Torvalds } 14911da177e4SLinus Torvalds 14921da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 14931da177e4SLinus Torvalds * enough. 14941da177e4SLinus Torvalds */ 14951da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 14961da177e4SLinus Torvalds { 14971da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 1498e2f036a9SMarcelo Ricardo Leitner int padlen = SCTP_PAD4(chunklen) - chunklen; 1499327c0dabSXin Long void *target; 15001da177e4SLinus Torvalds 1501b952f4dfSyuan linyu skb_put_zero(chunk->skb, padlen); 150259ae1d12SJohannes Berg target = skb_put_data(chunk->skb, data, len); 15031da177e4SLinus Torvalds 15041da177e4SLinus Torvalds /* Adjust the chunk length field. */ 15051da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 150627a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 15071da177e4SLinus Torvalds 15081da177e4SLinus Torvalds return target; 15091da177e4SLinus Torvalds } 15101da177e4SLinus Torvalds 15111da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 15121da177e4SLinus Torvalds * chunk is not big enough. 15131da177e4SLinus Torvalds * Returns a kernel err value. 15141da177e4SLinus Torvalds */ 1515e0eb093eSAl Viro int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 1516e0eb093eSAl Viro struct iov_iter *from) 15171da177e4SLinus Torvalds { 1518e0eb093eSAl Viro void *target; 15191da177e4SLinus Torvalds 15201da177e4SLinus Torvalds /* Make room in chunk for data. */ 15211da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 15221da177e4SLinus Torvalds 15231da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 15243b6d4dbfSAl Viro if (!copy_from_iter_full(target, len, from)) 1525e0eb093eSAl Viro return -EFAULT; 15261da177e4SLinus Torvalds 15271da177e4SLinus Torvalds /* Adjust the chunk length field. */ 15281da177e4SLinus Torvalds chunk->chunk_hdr->length = 15291da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 153027a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 15311da177e4SLinus Torvalds 1532e0eb093eSAl Viro return 0; 15331da177e4SLinus Torvalds } 15341da177e4SLinus Torvalds 15351da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15361da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15371da177e4SLinus Torvalds */ 15381da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 15391da177e4SLinus Torvalds { 1540ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 1541327c0dabSXin Long struct sctp_chunk *lchunk; 1542327c0dabSXin Long struct sctp_datamsg *msg; 1543327c0dabSXin Long __u16 ssn, sid; 15441da177e4SLinus Torvalds 15451da177e4SLinus Torvalds if (chunk->has_ssn) 15461da177e4SLinus Torvalds return; 15471da177e4SLinus Torvalds 1548ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1549ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1550cee360abSXin Long stream = &chunk->asoc->stream; 1551ab3e5e7bSVlad Yasevich 1552ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1553ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1554ab3e5e7bSVlad Yasevich */ 1555ab3e5e7bSVlad Yasevich msg = chunk->msg; 1556ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1557ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 15581da177e4SLinus Torvalds ssn = 0; 15591da177e4SLinus Torvalds } else { 1560ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1561a8386317SXin Long ssn = sctp_ssn_next(stream, out, sid); 15621da177e4SLinus Torvalds else 1563a8386317SXin Long ssn = sctp_ssn_peek(stream, out, sid); 15641da177e4SLinus Torvalds } 15651da177e4SLinus Torvalds 1566ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1567ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1568ab3e5e7bSVlad Yasevich } 15691da177e4SLinus Torvalds } 15701da177e4SLinus Torvalds 15711da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15721da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15731da177e4SLinus Torvalds */ 15741da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 15751da177e4SLinus Torvalds { 15761da177e4SLinus Torvalds if (!chunk->has_tsn) { 15771da177e4SLinus Torvalds /* This is the last possible instant to 15781da177e4SLinus Torvalds * assign a TSN. 15791da177e4SLinus Torvalds */ 15801da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 15811da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 15821da177e4SLinus Torvalds chunk->has_tsn = 1; 15831da177e4SLinus Torvalds } 15841da177e4SLinus Torvalds } 15851da177e4SLinus Torvalds 15861da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 15871da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 15883182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1589dd0fc66fSAl Viro gfp_t gfp) 15901da177e4SLinus Torvalds { 15911da177e4SLinus Torvalds struct sctp_association *asoc; 15921c662018SXin Long enum sctp_scope scope; 15931da177e4SLinus Torvalds struct sk_buff *skb; 15941da177e4SLinus Torvalds 15951da177e4SLinus Torvalds /* Create the bare association. */ 15961da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 15971da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 15981da177e4SLinus Torvalds if (!asoc) 15991da177e4SLinus Torvalds goto nodata; 16001da177e4SLinus Torvalds asoc->temp = 1; 16011da177e4SLinus Torvalds skb = chunk->skb; 16021da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1603e7487c86SMarcelo Ricardo Leitner SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1); 1604e7487c86SMarcelo Ricardo Leitner 16051da177e4SLinus Torvalds nodata: 16061da177e4SLinus Torvalds return asoc; 16071da177e4SLinus Torvalds } 16081da177e4SLinus Torvalds 16091da177e4SLinus Torvalds /* Build a cookie representing asoc. 16101da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 16111da177e4SLinus Torvalds */ 1612f48ef4c7SXin Long static struct sctp_cookie_param *sctp_pack_cookie( 1613f48ef4c7SXin Long const struct sctp_endpoint *ep, 16141da177e4SLinus Torvalds const struct sctp_association *asoc, 16151da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 1616327c0dabSXin Long int *cookie_len, const __u8 *raw_addrs, 1617327c0dabSXin Long int addrs_len) 16181da177e4SLinus Torvalds { 16191da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 1620f48ef4c7SXin Long struct sctp_cookie_param *retval; 16211da177e4SLinus Torvalds int headersize, bodysize; 16221da177e4SLinus Torvalds 16239834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 16249834a2bbSVlad Yasevich * any padding. 16259834a2bbSVlad Yasevich */ 16263c918704SXin Long headersize = sizeof(struct sctp_paramhdr) + 16279834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 16289834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 16291da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 16301da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 16311da177e4SLinus Torvalds 16321da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 16331da177e4SLinus Torvalds * functions simpler to write. 16341da177e4SLinus Torvalds */ 16351da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 16361da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 16371da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 16381da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 16391da177e4SLinus Torvalds 16401da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 16411da177e4SLinus Torvalds * out on the network. 16421da177e4SLinus Torvalds */ 1643af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1644af997d8cSArnaldo Carvalho de Melo if (!retval) 1645af997d8cSArnaldo Carvalho de Melo goto nodata; 1646af997d8cSArnaldo Carvalho de Melo 16471da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 16481da177e4SLinus Torvalds 16491da177e4SLinus Torvalds /* Set up the parameter header. */ 16501da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 16511da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 16521da177e4SLinus Torvalds 16531da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 16541da177e4SLinus Torvalds cookie->c = asoc->c; 16551da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 16561da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 16571da177e4SLinus Torvalds 16581da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 16591da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 16601da177e4SLinus Torvalds 16610f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 16620f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 16631da177e4SLinus Torvalds 16641da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 166552db882fSDaniel Borkmann cookie->c.expiration = ktime_add(asoc->cookie_life, 1666cb5e173eSMarcelo Ricardo Leitner ktime_get_real()); 16671da177e4SLinus Torvalds 16681da177e4SLinus Torvalds /* Copy the peer's init packet. */ 16691da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 16701da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 16711da177e4SLinus Torvalds 16721da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 16731da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 16741da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 16751da177e4SLinus Torvalds 16761da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 16775821c769SHerbert Xu SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); 16785821c769SHerbert Xu int err; 16791b489e11SHerbert Xu 16801da177e4SLinus Torvalds /* Sign the message. */ 16815821c769SHerbert Xu desc->tfm = sctp_sk(ep->base.sk)->hmac; 16825821c769SHerbert Xu desc->flags = 0; 16831da177e4SLinus Torvalds 16845821c769SHerbert Xu err = crypto_shash_setkey(desc->tfm, ep->secret_key, 16855821c769SHerbert Xu sizeof(ep->secret_key)) ?: 16865821c769SHerbert Xu crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize, 16875821c769SHerbert Xu cookie->signature); 16885821c769SHerbert Xu shash_desc_zero(desc); 16895821c769SHerbert Xu if (err) 16901b489e11SHerbert Xu goto free_cookie; 16911da177e4SLinus Torvalds } 16921da177e4SLinus Torvalds 16931da177e4SLinus Torvalds return retval; 16941b489e11SHerbert Xu 16951b489e11SHerbert Xu free_cookie: 16961b489e11SHerbert Xu kfree(retval); 16971b489e11SHerbert Xu nodata: 16981b489e11SHerbert Xu *cookie_len = 0; 16991b489e11SHerbert Xu return NULL; 17001da177e4SLinus Torvalds } 17011da177e4SLinus Torvalds 17021da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 17031da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 17041da177e4SLinus Torvalds const struct sctp_endpoint *ep, 17051da177e4SLinus Torvalds const struct sctp_association *asoc, 1706dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 17071da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 17081da177e4SLinus Torvalds { 17091da177e4SLinus Torvalds struct sctp_association *retval = NULL; 17101da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1711327c0dabSXin Long struct sctp_signed_cookie *cookie; 17121da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 1713327c0dabSXin Long struct sctp_cookie *bear_cookie; 1714327c0dabSXin Long __u8 *digest = ep->digest; 1715327c0dabSXin Long enum sctp_scope scope; 1716327c0dabSXin Long unsigned int len; 171752db882fSDaniel Borkmann ktime_t kt; 17181da177e4SLinus Torvalds 17199834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 17209834a2bbSVlad Yasevich * any padding. 17219834a2bbSVlad Yasevich */ 1722922dbc5bSXin Long headersize = sizeof(struct sctp_chunkhdr) + 17239834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 17249834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 17251da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 17261da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 17271da177e4SLinus Torvalds 17281da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 17291da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 17301da177e4SLinus Torvalds * INIT chunk. 17311da177e4SLinus Torvalds */ 17321da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17331da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 17341da177e4SLinus Torvalds goto malformed; 17351da177e4SLinus Torvalds 17361da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 17371da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 17381da177e4SLinus Torvalds goto malformed; 17391da177e4SLinus Torvalds 17401da177e4SLinus Torvalds /* Process the cookie. */ 17411da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 17421da177e4SLinus Torvalds bear_cookie = &cookie->c; 17431da177e4SLinus Torvalds 17441da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 17451da177e4SLinus Torvalds goto no_hmac; 17461da177e4SLinus Torvalds 17471da177e4SLinus Torvalds /* Check the signature. */ 17485821c769SHerbert Xu { 17495821c769SHerbert Xu SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); 17505821c769SHerbert Xu int err; 17511da177e4SLinus Torvalds 17525821c769SHerbert Xu desc->tfm = sctp_sk(ep->base.sk)->hmac; 17535821c769SHerbert Xu desc->flags = 0; 17545821c769SHerbert Xu 17555821c769SHerbert Xu err = crypto_shash_setkey(desc->tfm, ep->secret_key, 17565821c769SHerbert Xu sizeof(ep->secret_key)) ?: 17575821c769SHerbert Xu crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize, 17585821c769SHerbert Xu digest); 17595821c769SHerbert Xu shash_desc_zero(desc); 17605821c769SHerbert Xu 17615821c769SHerbert Xu if (err) { 17621b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17631b489e11SHerbert Xu goto fail; 17641b489e11SHerbert Xu } 17655821c769SHerbert Xu } 17661da177e4SLinus Torvalds 17671da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 17681da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 17691da177e4SLinus Torvalds goto fail; 17701da177e4SLinus Torvalds } 17711da177e4SLinus Torvalds 17721da177e4SLinus Torvalds no_hmac: 17731da177e4SLinus Torvalds /* IG Section 2.35.2: 17741da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 17751da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 17761da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 17771da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 17781da177e4SLinus Torvalds * discarded, 17791da177e4SLinus Torvalds */ 17801da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 17811da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 17821da177e4SLinus Torvalds goto fail; 17831da177e4SLinus Torvalds } 17841da177e4SLinus Torvalds 17859b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 17861da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 17871da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 17881da177e4SLinus Torvalds goto fail; 17891da177e4SLinus Torvalds } 17901da177e4SLinus Torvalds 17911da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 17921da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 17931da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1794f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1795f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1796f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1797f236218bSVlad Yasevich * down the new association establishment instead of every packet. 17981da177e4SLinus Torvalds */ 1799f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 180052db882fSDaniel Borkmann kt = skb_get_ktime(skb); 1801f236218bSVlad Yasevich else 1802cb5e173eSMarcelo Ricardo Leitner kt = ktime_get_real(); 1803f236218bSVlad Yasevich 180467cb9366SDaniel Borkmann if (!asoc && ktime_before(bear_cookie->expiration, kt)) { 18058914f4baSMarcelo Ricardo Leitner suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); 18068914f4baSMarcelo Ricardo Leitner __be32 n = htonl(usecs); 18078914f4baSMarcelo Ricardo Leitner 18081da177e4SLinus Torvalds /* 18091da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 18101da177e4SLinus Torvalds * 18111da177e4SLinus Torvalds * Cause of error 18121da177e4SLinus Torvalds * --------------- 18131da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 18141da177e4SLinus Torvalds * Cookie that has expired. 18151da177e4SLinus Torvalds */ 18168914f4baSMarcelo Ricardo Leitner *errp = sctp_make_op_error(asoc, chunk, 18178914f4baSMarcelo Ricardo Leitner SCTP_ERROR_STALE_COOKIE, &n, 18188914f4baSMarcelo Ricardo Leitner sizeof(n), 0); 18198914f4baSMarcelo Ricardo Leitner if (*errp) 18201da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 18218914f4baSMarcelo Ricardo Leitner else 18221da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18231da177e4SLinus Torvalds 18241da177e4SLinus Torvalds goto fail; 18251da177e4SLinus Torvalds } 18261da177e4SLinus Torvalds 18271da177e4SLinus Torvalds /* Make a new base association. */ 18281da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 18291da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 18301da177e4SLinus Torvalds if (!retval) { 18311da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18321da177e4SLinus Torvalds goto fail; 18331da177e4SLinus Torvalds } 18341da177e4SLinus Torvalds 18351da177e4SLinus Torvalds /* Set up our peer's port number. */ 18361da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 18371da177e4SLinus Torvalds 18381da177e4SLinus Torvalds /* Populate the association from the cookie. */ 18391da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 18401da177e4SLinus Torvalds 18411da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 18421da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 18431da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18441da177e4SLinus Torvalds goto fail; 18451da177e4SLinus Torvalds } 18461da177e4SLinus Torvalds 18471da177e4SLinus Torvalds /* Also, add the destination address. */ 18481da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1849f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1850133800d1SMarcelo Ricardo Leitner sizeof(chunk->dest), SCTP_ADDR_SRC, 1851133800d1SMarcelo Ricardo Leitner GFP_ATOMIC); 18521da177e4SLinus Torvalds } 18531da177e4SLinus Torvalds 18541da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 18551da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 18561da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 1857cc16f00fSXin Long retval->strreset_outseq = retval->c.initial_tsn; 18581da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 18591da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 18600f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 18611da177e4SLinus Torvalds 18621da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 18631da177e4SLinus Torvalds return retval; 18641da177e4SLinus Torvalds 18651da177e4SLinus Torvalds fail: 18661da177e4SLinus Torvalds if (retval) 18671da177e4SLinus Torvalds sctp_association_free(retval); 18681da177e4SLinus Torvalds 18691da177e4SLinus Torvalds return NULL; 18701da177e4SLinus Torvalds 18711da177e4SLinus Torvalds malformed: 18721da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 18731da177e4SLinus Torvalds * malformed. 18741da177e4SLinus Torvalds */ 18751da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 18761da177e4SLinus Torvalds goto fail; 18771da177e4SLinus Torvalds } 18781da177e4SLinus Torvalds 18791da177e4SLinus Torvalds /******************************************************************** 18801da177e4SLinus Torvalds * 3rd Level Abstractions 18811da177e4SLinus Torvalds ********************************************************************/ 18821da177e4SLinus Torvalds 18831da177e4SLinus Torvalds struct __sctp_missing { 18849f81bcd9SAl Viro __be32 num_missing; 18859f81bcd9SAl Viro __be16 type; 1886bc10502dSEric Dumazet } __packed; 18871da177e4SLinus Torvalds 18881da177e4SLinus Torvalds /* 18891da177e4SLinus Torvalds * Report a missing mandatory parameter. 18901da177e4SLinus Torvalds */ 18911da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 189234b4e29bSXin Long enum sctp_param paramtype, 18931da177e4SLinus Torvalds struct sctp_chunk *chunk, 18941da177e4SLinus Torvalds struct sctp_chunk **errp) 18951da177e4SLinus Torvalds { 18961da177e4SLinus Torvalds struct __sctp_missing report; 18971da177e4SLinus Torvalds __u16 len; 18981da177e4SLinus Torvalds 1899e2f036a9SMarcelo Ricardo Leitner len = SCTP_PAD4(sizeof(report)); 19001da177e4SLinus Torvalds 19011da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 19021da177e4SLinus Torvalds * returning multiple unknown parameters. 19031da177e4SLinus Torvalds */ 19041da177e4SLinus Torvalds if (!*errp) 19051da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19061da177e4SLinus Torvalds 19071da177e4SLinus Torvalds if (*errp) { 19081da177e4SLinus Torvalds report.num_missing = htonl(1); 19091da177e4SLinus Torvalds report.type = paramtype; 1910ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 191100f1c2dfSWei Yongjun sizeof(report)); 191200f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 19131da177e4SLinus Torvalds } 19141da177e4SLinus Torvalds 19151da177e4SLinus Torvalds /* Stop processing this chunk. */ 19161da177e4SLinus Torvalds return 0; 19171da177e4SLinus Torvalds } 19181da177e4SLinus Torvalds 19191da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 19201da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 19211da177e4SLinus Torvalds struct sctp_chunk *chunk, 19221da177e4SLinus Torvalds struct sctp_chunk **errp) 19231da177e4SLinus Torvalds { 19241da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 19251da177e4SLinus Torvalds 19261da177e4SLinus Torvalds if (!*errp) 19271da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 19281da177e4SLinus Torvalds 19291da177e4SLinus Torvalds if (*errp) 193000f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 19311da177e4SLinus Torvalds 19321da177e4SLinus Torvalds /* Stop processing this chunk. */ 19331da177e4SLinus Torvalds return 0; 19341da177e4SLinus Torvalds } 19351da177e4SLinus Torvalds 19361da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 19371da177e4SLinus Torvalds struct sctp_paramhdr *param, 19381da177e4SLinus Torvalds const struct sctp_chunk *chunk, 19391da177e4SLinus Torvalds struct sctp_chunk **errp) 19401da177e4SLinus Torvalds { 19417ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 19427ab90804SVlad Yasevich * not reported. 19437ab90804SVlad Yasevich */ 19447ab90804SVlad Yasevich if (*errp) 19457ab90804SVlad Yasevich sctp_chunk_free(*errp); 19467ab90804SVlad Yasevich 19471da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1948ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 19491da177e4SLinus Torvalds 19501da177e4SLinus Torvalds return 0; 19511da177e4SLinus Torvalds } 19521da177e4SLinus Torvalds 19531da177e4SLinus Torvalds 19541da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 19551da177e4SLinus Torvalds * send back an indicator to the peer. 19561da177e4SLinus Torvalds */ 19571da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 19581da177e4SLinus Torvalds union sctp_params param, 19591da177e4SLinus Torvalds struct sctp_chunk *chunk, 19601da177e4SLinus Torvalds struct sctp_chunk **errp) 19611da177e4SLinus Torvalds { 19621da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 19631da177e4SLinus Torvalds 19647ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 19657ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 19667ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 19677ab90804SVlad Yasevich * them in the ABORT. 19687ab90804SVlad Yasevich */ 19697ab90804SVlad Yasevich if (*errp) 19707ab90804SVlad Yasevich sctp_chunk_free(*errp); 19717ab90804SVlad Yasevich 19728914f4baSMarcelo Ricardo Leitner *errp = sctp_make_op_error(asoc, chunk, SCTP_ERROR_DNS_FAILED, 19738914f4baSMarcelo Ricardo Leitner param.v, len, 0); 19741da177e4SLinus Torvalds 19751da177e4SLinus Torvalds /* Stop processing this chunk. */ 19761da177e4SLinus Torvalds return 0; 19771da177e4SLinus Torvalds } 19781da177e4SLinus Torvalds 1979f53b5b09SEric W. Biederman static int sctp_verify_ext_param(struct net *net, union sctp_params param) 1980d6701191SVlad Yasevich { 19813c918704SXin Long __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 1982d6701191SVlad Yasevich int have_asconf = 0; 1983327c0dabSXin Long int have_auth = 0; 1984d6701191SVlad Yasevich int i; 1985d6701191SVlad Yasevich 1986d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 1987d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 1988d6701191SVlad Yasevich case SCTP_CID_AUTH: 1989d6701191SVlad Yasevich have_auth = 1; 1990d6701191SVlad Yasevich break; 1991d6701191SVlad Yasevich case SCTP_CID_ASCONF: 1992d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 1993d6701191SVlad Yasevich have_asconf = 1; 1994d6701191SVlad Yasevich break; 1995d6701191SVlad Yasevich } 1996d6701191SVlad Yasevich } 1997d6701191SVlad Yasevich 1998d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 1999d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 2000d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 2001d6701191SVlad Yasevich * mode. 2002d6701191SVlad Yasevich */ 2003e1fc3b14SEric W. Biederman if (net->sctp.addip_noauth) 2004d6701191SVlad Yasevich return 1; 2005d6701191SVlad Yasevich 2006e1fc3b14SEric W. Biederman if (net->sctp.addip_enable && !have_auth && have_asconf) 2007d6701191SVlad Yasevich return 0; 2008d6701191SVlad Yasevich 2009d6701191SVlad Yasevich return 1; 2010d6701191SVlad Yasevich } 2011d6701191SVlad Yasevich 2012131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 2013131a47e3SVlad Yasevich union sctp_params param) 2014131a47e3SVlad Yasevich { 20153c918704SXin Long __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 2016327c0dabSXin Long struct net *net = sock_net(asoc->base.sk); 2017131a47e3SVlad Yasevich int i; 2018131a47e3SVlad Yasevich 2019131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 2020131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 2021c28445c3SXin Long case SCTP_CID_RECONF: 2022c28445c3SXin Long if (asoc->reconf_enable && 2023c28445c3SXin Long !asoc->peer.reconf_capable) 2024c28445c3SXin Long asoc->peer.reconf_capable = 1; 2025c28445c3SXin Long break; 2026131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 202728aa4c26SXin Long if (asoc->prsctp_enable && !asoc->peer.prsctp_capable) 2028131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 2029131a47e3SVlad Yasevich break; 2030730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 2031730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 2032730fc3d0SVlad Yasevich * supports AUTH. 2033730fc3d0SVlad Yasevich */ 2034b14878ccSVlad Yasevich if (asoc->ep->auth_enable) 2035730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 2036730fc3d0SVlad Yasevich break; 2037131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 2038131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 2039e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 204088799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 20416b2f9cb6SVlad Yasevich break; 204296b120b3SXin Long case SCTP_CID_I_DATA: 204396b120b3SXin Long if (sctp_sk(asoc->base.sk)->strm_interleave) 204496b120b3SXin Long asoc->intl_enable = 1; 204596b120b3SXin Long break; 2046131a47e3SVlad Yasevich default: 2047131a47e3SVlad Yasevich break; 2048131a47e3SVlad Yasevich } 2049131a47e3SVlad Yasevich } 2050131a47e3SVlad Yasevich } 2051131a47e3SVlad Yasevich 20521da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 20531da177e4SLinus Torvalds * 20541da177e4SLinus Torvalds * The Parameter Types are encoded such that the 20551da177e4SLinus Torvalds * highest-order two bits specify the action that must be 20561da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 20571da177e4SLinus Torvalds * Parameter Type. 20581da177e4SLinus Torvalds * 20597ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 20607ab90804SVlad Yasevich * parameters within this chunk 20611da177e4SLinus Torvalds * 20627ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 20637ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 20647ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 20651da177e4SLinus Torvalds * 20661da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 20671da177e4SLinus Torvalds * 20681da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 20691da177e4SLinus Torvalds * report the unrecognized parameter in an 20707ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 20711da177e4SLinus Torvalds * 20721da177e4SLinus Torvalds * Return value: 20737ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20747ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 20757ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 20761da177e4SLinus Torvalds */ 20774785c7aeSXin Long static enum sctp_ierror sctp_process_unk_param( 20784785c7aeSXin Long const struct sctp_association *asoc, 20791da177e4SLinus Torvalds union sctp_params param, 20801da177e4SLinus Torvalds struct sctp_chunk *chunk, 20811da177e4SLinus Torvalds struct sctp_chunk **errp) 20821da177e4SLinus Torvalds { 20837ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 20841da177e4SLinus Torvalds 20851da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 20861da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 20877ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20881da177e4SLinus Torvalds break; 20891da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 20901da177e4SLinus Torvalds break; 20917ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 20927ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20937ab90804SVlad Yasevich /* Fall through */ 20941da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 20951da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 20961da177e4SLinus Torvalds * returning multiple unknown parameters. 20971da177e4SLinus Torvalds */ 20988914f4baSMarcelo Ricardo Leitner if (!*errp) { 20998914f4baSMarcelo Ricardo Leitner *errp = sctp_make_op_error_limited(asoc, chunk); 21008914f4baSMarcelo Ricardo Leitner if (!*errp) { 21018914f4baSMarcelo Ricardo Leitner /* If there is no memory for generating the 21028914f4baSMarcelo Ricardo Leitner * ERROR report as specified, an ABORT will be 21038914f4baSMarcelo Ricardo Leitner * triggered to the peer and the association 21048914f4baSMarcelo Ricardo Leitner * won't be established. 21051da177e4SLinus Torvalds */ 21067ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 21078914f4baSMarcelo Ricardo Leitner break; 21081da177e4SLinus Torvalds } 21098914f4baSMarcelo Ricardo Leitner } 21108914f4baSMarcelo Ricardo Leitner 21118914f4baSMarcelo Ricardo Leitner if (!sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, 21128914f4baSMarcelo Ricardo Leitner ntohs(param.p->length))) 21138914f4baSMarcelo Ricardo Leitner sctp_addto_chunk(*errp, ntohs(param.p->length), 21148914f4baSMarcelo Ricardo Leitner param.v); 21151da177e4SLinus Torvalds break; 21161da177e4SLinus Torvalds default: 21171da177e4SLinus Torvalds break; 21181da177e4SLinus Torvalds } 21191da177e4SLinus Torvalds 21201da177e4SLinus Torvalds return retval; 21211da177e4SLinus Torvalds } 21221da177e4SLinus Torvalds 21237ab90804SVlad Yasevich /* Verify variable length parameters 21241da177e4SLinus Torvalds * Return values: 21257ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 21267ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 21277ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 21287ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 21291da177e4SLinus Torvalds */ 21304785c7aeSXin Long static enum sctp_ierror sctp_verify_param(struct net *net, 2131b14878ccSVlad Yasevich const struct sctp_endpoint *ep, 2132f53b5b09SEric W. Biederman const struct sctp_association *asoc, 21331da177e4SLinus Torvalds union sctp_params param, 21346d85e68fSXin Long enum sctp_cid cid, 21351da177e4SLinus Torvalds struct sctp_chunk *chunk, 21361da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 21371da177e4SLinus Torvalds { 213872da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 21397ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 214072da7b38SWei Yongjun __u16 n_elt, id = 0; 214172da7b38SWei Yongjun int i; 21421da177e4SLinus Torvalds 21431da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 21441da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 21451da177e4SLinus Torvalds * identified based on the chunk id. 21461da177e4SLinus Torvalds */ 21471da177e4SLinus Torvalds 21481da177e4SLinus Torvalds switch (param.p->type) { 21491da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 21501da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 21511da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 21521da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 21531da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 21541da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 21551da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 21561da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 21570f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2158d6701191SVlad Yasevich break; 2159d6701191SVlad Yasevich 2160131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2161f53b5b09SEric W. Biederman if (!sctp_verify_ext_param(net, param)) 2162d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 21631da177e4SLinus Torvalds break; 21641da177e4SLinus Torvalds 2165d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2166e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 2167d6de3097SVlad Yasevich break; 2168d6de3097SVlad Yasevich goto fallthrough; 2169d6de3097SVlad Yasevich 21701da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 21711da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 21727ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 21737ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21747ab90804SVlad Yasevich break; 2175131a47e3SVlad Yasevich 21761da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 217728aa4c26SXin Long if (ep->prsctp_enable) 21781da177e4SLinus Torvalds break; 2179730fc3d0SVlad Yasevich goto fallthrough; 2180730fc3d0SVlad Yasevich 2181730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2182b14878ccSVlad Yasevich if (!ep->auth_enable) 2183730fc3d0SVlad Yasevich goto fallthrough; 2184730fc3d0SVlad Yasevich 2185730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2186730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2187730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2188730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2189730fc3d0SVlad Yasevich */ 21908914f4baSMarcelo Ricardo Leitner if (SCTP_AUTH_RANDOM_LENGTH != ntohs(param.p->length) - 21918914f4baSMarcelo Ricardo Leitner sizeof(struct sctp_paramhdr)) { 21927ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2193730fc3d0SVlad Yasevich chunk, err_chunk); 21947ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21957ab90804SVlad Yasevich } 2196730fc3d0SVlad Yasevich break; 2197730fc3d0SVlad Yasevich 2198730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2199b14878ccSVlad Yasevich if (!ep->auth_enable) 2200730fc3d0SVlad Yasevich goto fallthrough; 2201730fc3d0SVlad Yasevich 2202730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2203730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2204730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2205730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2206730fc3d0SVlad Yasevich */ 22077ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 22087ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2209730fc3d0SVlad Yasevich chunk, err_chunk); 22107ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 22117ab90804SVlad Yasevich } 2212730fc3d0SVlad Yasevich break; 2213730fc3d0SVlad Yasevich 2214730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2215b14878ccSVlad Yasevich if (!ep->auth_enable) 221672da7b38SWei Yongjun goto fallthrough; 221772da7b38SWei Yongjun 221872da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 22193c918704SXin Long n_elt = (ntohs(param.p->length) - 22203c918704SXin Long sizeof(struct sctp_paramhdr)) >> 1; 222172da7b38SWei Yongjun 222272da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 222372da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 222472da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 222572da7b38SWei Yongjun */ 222672da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 222772da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 222872da7b38SWei Yongjun 222972da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2230730fc3d0SVlad Yasevich break; 223172da7b38SWei Yongjun } 223272da7b38SWei Yongjun 223372da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 223472da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 223572da7b38SWei Yongjun err_chunk); 223672da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 223772da7b38SWei Yongjun } 223872da7b38SWei Yongjun break; 2239730fc3d0SVlad Yasevich fallthrough: 22401da177e4SLinus Torvalds default: 2241bb33381dSDaniel Borkmann pr_debug("%s: unrecognized param:%d for chunk:%d\n", 2242bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), cid); 2243bb33381dSDaniel Borkmann 22447ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 22451da177e4SLinus Torvalds break; 22461da177e4SLinus Torvalds } 22471da177e4SLinus Torvalds return retval; 22481da177e4SLinus Torvalds } 22491da177e4SLinus Torvalds 22501da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 2251b14878ccSVlad Yasevich int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 22526d85e68fSXin Long const struct sctp_association *asoc, enum sctp_cid cid, 225301a992beSXin Long struct sctp_init_chunk *peer_init, 225401a992beSXin Long struct sctp_chunk *chunk, struct sctp_chunk **errp) 22551da177e4SLinus Torvalds { 22561da177e4SLinus Torvalds union sctp_params param; 22577613f5feSDaniel Borkmann bool has_cookie = false; 22587ab90804SVlad Yasevich int result; 22591da177e4SLinus Torvalds 22607613f5feSDaniel Borkmann /* Check for missing mandatory parameters. Note: Initial TSN is 22617613f5feSDaniel Borkmann * also mandatory, but is not checked here since the valid range 22627613f5feSDaniel Borkmann * is 0..2**32-1. RFC4960, section 3.3.3. 22637613f5feSDaniel Borkmann */ 22647613f5feSDaniel Borkmann if (peer_init->init_hdr.num_outbound_streams == 0 || 22657613f5feSDaniel Borkmann peer_init->init_hdr.num_inbound_streams == 0 || 22667613f5feSDaniel Borkmann peer_init->init_hdr.init_tag == 0 || 22677613f5feSDaniel Borkmann ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) 22687ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 22691da177e4SLinus Torvalds 22701da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22717613f5feSDaniel Borkmann if (param.p->type == SCTP_PARAM_STATE_COOKIE) 22727613f5feSDaniel Borkmann has_cookie = true; 22737613f5feSDaniel Borkmann } 22741da177e4SLinus Torvalds 22751da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 22761da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 22771da177e4SLinus Torvalds * The current param.p would point at the bad one. 22781da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 22791da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 22801da177e4SLinus Torvalds * error handling code build and send the packet. 22811da177e4SLinus Torvalds */ 22827ab90804SVlad Yasevich if (param.v != (void *)chunk->chunk_end) 22837ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 22841da177e4SLinus Torvalds 22851da177e4SLinus Torvalds /* The only missing mandatory param possible today is 22861da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 22871da177e4SLinus Torvalds */ 22887ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 22897ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 22901da177e4SLinus Torvalds chunk, errp); 22911da177e4SLinus Torvalds 22927ab90804SVlad Yasevich /* Verify all the variable length parameters */ 22931da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2294b14878ccSVlad Yasevich result = sctp_verify_param(net, ep, asoc, param, cid, 2295b14878ccSVlad Yasevich chunk, errp); 22967ab90804SVlad Yasevich switch (result) { 22977ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 22987ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 22991da177e4SLinus Torvalds return 0; 23007ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 23011da177e4SLinus Torvalds return 1; 23027ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 23037ab90804SVlad Yasevich default: 23047ab90804SVlad Yasevich break; 23051da177e4SLinus Torvalds } 23061da177e4SLinus Torvalds 23071da177e4SLinus Torvalds } /* for (loop through all parameters) */ 23081da177e4SLinus Torvalds 23091da177e4SLinus Torvalds return 1; 23101da177e4SLinus Torvalds } 23111da177e4SLinus Torvalds 23121da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 23131da177e4SLinus Torvalds * Returns 0 on failure, else success. 23141da177e4SLinus Torvalds * FIXME: This is an association method. 23151da177e4SLinus Torvalds */ 2316de6becdcSWei Yongjun int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, 23171da177e4SLinus Torvalds const union sctp_addr *peer_addr, 231801a992beSXin Long struct sctp_init_chunk *peer_init, gfp_t gfp) 23191da177e4SLinus Torvalds { 2320e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 23211da177e4SLinus Torvalds struct sctp_transport *transport; 23221da177e4SLinus Torvalds struct list_head *pos, *temp; 2323327c0dabSXin Long union sctp_params param; 2324de6becdcSWei Yongjun union sctp_addr addr; 2325327c0dabSXin Long struct sctp_af *af; 2326de6becdcSWei Yongjun int src_match = 0; 2327327c0dabSXin Long char *cookie; 23281da177e4SLinus Torvalds 23291da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 23301da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 23311da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 23321da177e4SLinus Torvalds * of the INIT from the cookie. 23331da177e4SLinus Torvalds */ 23341da177e4SLinus Torvalds 23351da177e4SLinus Torvalds /* This implementation defaults to making the first transport 23361da177e4SLinus Torvalds * added as the primary transport. The source address seems to 23371da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 23381da177e4SLinus Torvalds */ 23396a1e5f33SAl Viro if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 23401da177e4SLinus Torvalds goto nomem; 2341de6becdcSWei Yongjun 2342de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) 2343de6becdcSWei Yongjun src_match = 1; 23441da177e4SLinus Torvalds 23451da177e4SLinus Torvalds /* Process the initialization parameters. */ 23461da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2347de6becdcSWei Yongjun if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 2348de6becdcSWei Yongjun param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { 2349de6becdcSWei Yongjun af = sctp_get_af_specific(param_type2af(param.p->type)); 2350de6becdcSWei Yongjun af->from_addr_param(&addr, param.addr, 2351de6becdcSWei Yongjun chunk->sctp_hdr->source, 0); 2352de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) 2353de6becdcSWei Yongjun src_match = 1; 2354de6becdcSWei Yongjun } 23551da177e4SLinus Torvalds 23561da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 23571da177e4SLinus Torvalds goto clean_up; 23581da177e4SLinus Torvalds } 23591da177e4SLinus Torvalds 2360de6becdcSWei Yongjun /* source address of chunk may not match any valid address */ 2361de6becdcSWei Yongjun if (!src_match) 2362de6becdcSWei Yongjun goto clean_up; 2363de6becdcSWei Yongjun 2364730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2365730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2366730fc3d0SVlad Yasevich */ 2367730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2368730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2369730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2370730fc3d0SVlad Yasevich 2371d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2372d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2373d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2374d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2375d6701191SVlad Yasevich * is what we'll do here. 23766b2f9cb6SVlad Yasevich */ 2377e1fc3b14SEric W. Biederman if (!net->sctp.addip_noauth && 237873d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 23796b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 23806b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 23816b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 238288799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2383d6701191SVlad Yasevich goto clean_up; 23846b2f9cb6SVlad Yasevich } 23856b2f9cb6SVlad Yasevich 23863f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 23873f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 23883f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 23893f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 23903f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 23913f7a87d2SFrank Filz } 23923f7a87d2SFrank Filz } 23933f7a87d2SFrank Filz 23941da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 23951da177e4SLinus Torvalds * order. 23961da177e4SLinus Torvalds */ 23971da177e4SLinus Torvalds asoc->peer.i.init_tag = 23981da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 23991da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 24001da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 24011da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 24021da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 24031da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 24041da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 24051da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 24061da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 24071da177e4SLinus Torvalds 2408cc16f00fSXin Long asoc->strreset_inseq = asoc->peer.i.initial_tsn; 2409cc16f00fSXin Long 24101da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 24111da177e4SLinus Torvalds * number of inbound streams. 24121da177e4SLinus Torvalds */ 24131da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 24141da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 24151da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 24161da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 24171da177e4SLinus Torvalds } 24181da177e4SLinus Torvalds 24191da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 24201da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 24211da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 24221da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 24231da177e4SLinus Torvalds } 24241da177e4SLinus Torvalds 24251da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 24261da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 24271da177e4SLinus Torvalds 24281da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 24291da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 24301da177e4SLinus Torvalds 24311da177e4SLinus Torvalds /* Copy cookie in case we need to resend COOKIE-ECHO. */ 24321da177e4SLinus Torvalds cookie = asoc->peer.cookie; 24331da177e4SLinus Torvalds if (cookie) { 2434af997d8cSArnaldo Carvalho de Melo asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); 24351da177e4SLinus Torvalds if (!asoc->peer.cookie) 24361da177e4SLinus Torvalds goto clean_up; 24371da177e4SLinus Torvalds } 24381da177e4SLinus Torvalds 24391da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 24401da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 24411da177e4SLinus Torvalds * advertised window). 24421da177e4SLinus Torvalds */ 24439dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 24449dbc15f0SRobert P. J. Day transports) { 24451da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 24461da177e4SLinus Torvalds } 24471da177e4SLinus Torvalds 24481da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 24498e1ee18cSVlad Yasevich if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 24508e1ee18cSVlad Yasevich asoc->peer.i.initial_tsn, gfp)) 24518e1ee18cSVlad Yasevich goto clean_up; 24521da177e4SLinus Torvalds 24531da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 24541da177e4SLinus Torvalds * 24551da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 24561da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 24571da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 24581da177e4SLinus Torvalds * stream sequence number shall be set to 0. 24591da177e4SLinus Torvalds */ 24601da177e4SLinus Torvalds 2461ff356414SXin Long if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams, 2462ff356414SXin Long asoc->c.sinit_max_instreams, gfp)) 24631da177e4SLinus Torvalds goto clean_up; 24641da177e4SLinus Torvalds 24654135cce7SXin Long /* Update frag_point when stream_interleave may get changed. */ 24664135cce7SXin Long sctp_assoc_update_frag_point(asoc); 24674135cce7SXin Long 24687e062977SXin Long if (!asoc->temp && sctp_assoc_set_id(asoc, gfp)) 24691da177e4SLinus Torvalds goto clean_up; 24701da177e4SLinus Torvalds 24711da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 24721da177e4SLinus Torvalds * 24731da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 24741da177e4SLinus Torvalds * remote endpoint it should do the following: 24751da177e4SLinus Torvalds * ... 24761da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 24771da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 24781da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 24791da177e4SLinus Torvalds * association to the same value as the Initial TSN. 24801da177e4SLinus Torvalds */ 24811da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 24821da177e4SLinus Torvalds return 1; 24831da177e4SLinus Torvalds 24841da177e4SLinus Torvalds clean_up: 24851da177e4SLinus Torvalds /* Release the transport structures. */ 24861da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 24871da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2488add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2489add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 24901da177e4SLinus Torvalds } 24913f7a87d2SFrank Filz 24921da177e4SLinus Torvalds nomem: 24931da177e4SLinus Torvalds return 0; 24941da177e4SLinus Torvalds } 24951da177e4SLinus Torvalds 24961da177e4SLinus Torvalds 24971da177e4SLinus Torvalds /* Update asoc with the option described in param. 24981da177e4SLinus Torvalds * 24991da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 25001da177e4SLinus Torvalds * 25011da177e4SLinus Torvalds * asoc is the association to update. 25021da177e4SLinus Torvalds * param is the variable length parameter to use for update. 25031da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 25041da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 25051da177e4SLinus Torvalds * work we do. In particular, we should not build transport 25061da177e4SLinus Torvalds * structures for the addresses. 25071da177e4SLinus Torvalds */ 25081da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 25091da177e4SLinus Torvalds union sctp_params param, 25101da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2511dd0fc66fSAl Viro gfp_t gfp) 25121da177e4SLinus Torvalds { 2513e7ff4a70SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 2514327c0dabSXin Long struct sctp_endpoint *ep = asoc->ep; 2515d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 2516d6de3097SVlad Yasevich struct sctp_transport *t; 2517327c0dabSXin Long enum sctp_scope scope; 2518327c0dabSXin Long union sctp_addr addr; 2519327c0dabSXin Long struct sctp_af *af; 2520327c0dabSXin Long int retval = 1, i; 2521327c0dabSXin Long u32 stale; 2522327c0dabSXin Long __u16 sat; 25231da177e4SLinus Torvalds 25241da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 25251da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 25261da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 25271da177e4SLinus Torvalds */ 25281da177e4SLinus Torvalds switch (param.p->type) { 25291da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25301da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 25311da177e4SLinus Torvalds break; 25327dab83deSVlad Yasevich goto do_addr_param; 25337dab83deSVlad Yasevich 25341da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25357dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 25367dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 25377dab83deSVlad Yasevich break; 25387dab83deSVlad Yasevich do_addr_param: 25391da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2540dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 25411da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2542e7ff4a70SEric W. Biederman if (sctp_in_scope(net, &addr, scope)) 2543dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 25441da177e4SLinus Torvalds return 0; 25451da177e4SLinus Torvalds break; 25461da177e4SLinus Torvalds 25471da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 2548e1fc3b14SEric W. Biederman if (!net->sctp.cookie_preserve_enable) 25491da177e4SLinus Torvalds break; 25501da177e4SLinus Torvalds 25511da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 25521da177e4SLinus Torvalds 25531da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 25541da177e4SLinus Torvalds * (1/1000sec). 25551da177e4SLinus Torvalds */ 255652db882fSDaniel Borkmann asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); 25571da177e4SLinus Torvalds break; 25581da177e4SLinus Torvalds 25591da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 2560bb33381dSDaniel Borkmann pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); 25611da177e4SLinus Torvalds break; 25621da177e4SLinus Torvalds 25631da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 25641da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 25651da177e4SLinus Torvalds * ones are really set by the peer. 25661da177e4SLinus Torvalds */ 25671da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 25681da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 25691da177e4SLinus Torvalds 2570140ee960SGui Jianfeng /* Assume that peer supports the address family 2571140ee960SGui Jianfeng * by which it sends a packet. 2572140ee960SGui Jianfeng */ 2573140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2574140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2575140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2576140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2577140ee960SGui Jianfeng 25781da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 25793c918704SXin Long sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 25801da177e4SLinus Torvalds if (sat) 25811da177e4SLinus Torvalds sat /= sizeof(__u16); 25821da177e4SLinus Torvalds 25831da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 25841da177e4SLinus Torvalds switch (param.sat->types[i]) { 25851da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25861da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 25871da177e4SLinus Torvalds break; 25881da177e4SLinus Torvalds 25891da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25906e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 25911da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 25921da177e4SLinus Torvalds break; 25931da177e4SLinus Torvalds 25941da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 25951da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 25961da177e4SLinus Torvalds break; 25971da177e4SLinus Torvalds 25981da177e4SLinus Torvalds default: /* Just ignore anything else. */ 25991da177e4SLinus Torvalds break; 26003ff50b79SStephen Hemminger } 26011da177e4SLinus Torvalds } 26021da177e4SLinus Torvalds break; 26031da177e4SLinus Torvalds 26041da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 26051da177e4SLinus Torvalds asoc->peer.cookie_len = 26063c918704SXin Long ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 26071da177e4SLinus Torvalds asoc->peer.cookie = param.cookie->body; 26081da177e4SLinus Torvalds break; 26091da177e4SLinus Torvalds 26101da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 26111da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 26121da177e4SLinus Torvalds break; 26131da177e4SLinus Torvalds 26141da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 26151da177e4SLinus Torvalds /* Rejected during verify stage. */ 26161da177e4SLinus Torvalds break; 26171da177e4SLinus Torvalds 26181da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 26191da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 26201da177e4SLinus Torvalds break; 26211da177e4SLinus Torvalds 26220f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2623e69c4e0fSVlad Yasevich asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); 26241da177e4SLinus Torvalds break; 26251da177e4SLinus Torvalds 2626d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2627e1fc3b14SEric W. Biederman if (!net->sctp.addip_enable) 26280ef46e28SVlad Yasevich goto fall_through; 26290ef46e28SVlad Yasevich 26308b32f234SXin Long addr_param = param.v + sizeof(struct sctp_addip_param); 2631d6de3097SVlad Yasevich 2632cfbf654eSSaran Maruti Ramanara af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 2633e40607cbSDaniel Borkmann if (af == NULL) 2634e40607cbSDaniel Borkmann break; 2635e40607cbSDaniel Borkmann 2636d6de3097SVlad Yasevich af->from_addr_param(&addr, addr_param, 2637d6de3097SVlad Yasevich htons(asoc->peer.port), 0); 2638d6de3097SVlad Yasevich 2639d6de3097SVlad Yasevich /* if the address is invalid, we can't process it. 2640d6de3097SVlad Yasevich * XXX: see spec for what to do. 2641d6de3097SVlad Yasevich */ 2642d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2643d6de3097SVlad Yasevich break; 2644d6de3097SVlad Yasevich 2645d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2646d6de3097SVlad Yasevich if (!t) 2647d6de3097SVlad Yasevich break; 2648d6de3097SVlad Yasevich 2649d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2650d6de3097SVlad Yasevich break; 2651d6de3097SVlad Yasevich 2652131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2653131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2654131a47e3SVlad Yasevich break; 2655131a47e3SVlad Yasevich 26561da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 265728aa4c26SXin Long if (asoc->prsctp_enable) { 26581da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 26591da177e4SLinus Torvalds break; 26601da177e4SLinus Torvalds } 26611da177e4SLinus Torvalds /* Fall Through */ 2662730fc3d0SVlad Yasevich goto fall_through; 2663730fc3d0SVlad Yasevich 2664730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2665b14878ccSVlad Yasevich if (!ep->auth_enable) 2666730fc3d0SVlad Yasevich goto fall_through; 2667730fc3d0SVlad Yasevich 2668730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2669730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2670730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2671730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2672730fc3d0SVlad Yasevich retval = 0; 2673730fc3d0SVlad Yasevich break; 2674730fc3d0SVlad Yasevich } 2675730fc3d0SVlad Yasevich break; 2676730fc3d0SVlad Yasevich 2677730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2678b14878ccSVlad Yasevich if (!ep->auth_enable) 2679730fc3d0SVlad Yasevich goto fall_through; 2680730fc3d0SVlad Yasevich 2681730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2682730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2683730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2684730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2685730fc3d0SVlad Yasevich retval = 0; 2686730fc3d0SVlad Yasevich break; 2687730fc3d0SVlad Yasevich } 2688730fc3d0SVlad Yasevich 2689730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2690730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2691730fc3d0SVlad Yasevich break; 2692730fc3d0SVlad Yasevich 2693730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2694b14878ccSVlad Yasevich if (!ep->auth_enable) 2695730fc3d0SVlad Yasevich goto fall_through; 2696730fc3d0SVlad Yasevich 2697730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2698730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2699730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2700730fc3d0SVlad Yasevich retval = 0; 2701730fc3d0SVlad Yasevich break; 2702730fc3d0SVlad Yasevich fall_through: 27031da177e4SLinus Torvalds default: 27041da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 27051da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 27061da177e4SLinus Torvalds * called prior to this routine. Simply log the error 27071da177e4SLinus Torvalds * here. 27081da177e4SLinus Torvalds */ 2709bb33381dSDaniel Borkmann pr_debug("%s: ignoring param:%d for association:%p.\n", 2710bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), asoc); 27111da177e4SLinus Torvalds break; 27123ff50b79SStephen Hemminger } 27131da177e4SLinus Torvalds 27141da177e4SLinus Torvalds return retval; 27151da177e4SLinus Torvalds } 27161da177e4SLinus Torvalds 27171da177e4SLinus Torvalds /* Select a new verification tag. */ 27181da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 27191da177e4SLinus Torvalds { 27201da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 27211da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 27221da177e4SLinus Torvalds */ 27231da177e4SLinus Torvalds __u32 x; 27241da177e4SLinus Torvalds 27251da177e4SLinus Torvalds do { 27261da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 27271da177e4SLinus Torvalds } while (x == 0); 27281da177e4SLinus Torvalds 27291da177e4SLinus Torvalds return x; 27301da177e4SLinus Torvalds } 27311da177e4SLinus Torvalds 27321da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 27331da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 27341da177e4SLinus Torvalds { 27351da177e4SLinus Torvalds __u32 retval; 27361da177e4SLinus Torvalds 27371da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 27381da177e4SLinus Torvalds return retval; 27391da177e4SLinus Torvalds } 27401da177e4SLinus Torvalds 27411da177e4SLinus Torvalds /* 27421da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 27431da177e4SLinus Torvalds * 0 1 2 3 27441da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 27451da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27461da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 27471da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27481da177e4SLinus Torvalds * | Serial Number | 27491da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27501da177e4SLinus Torvalds * | Address Parameter | 27511da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27521da177e4SLinus Torvalds * | ASCONF Parameter #1 | 27531da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27541da177e4SLinus Torvalds * \ \ 27551da177e4SLinus Torvalds * / .... / 27561da177e4SLinus Torvalds * \ \ 27571da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27581da177e4SLinus Torvalds * | ASCONF Parameter #N | 27591da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27601da177e4SLinus Torvalds * 27611da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 27621da177e4SLinus Torvalds */ 27631da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 27641da177e4SLinus Torvalds union sctp_addr *addr, 27651da177e4SLinus Torvalds int vparam_len) 27661da177e4SLinus Torvalds { 276765205cc4SXin Long struct sctp_addiphdr asconf; 27681da177e4SLinus Torvalds struct sctp_chunk *retval; 27691da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 27701da177e4SLinus Torvalds union sctp_addr_param addrparam; 27711da177e4SLinus Torvalds int addrlen; 27721da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 27731da177e4SLinus Torvalds 27741da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 27751da177e4SLinus Torvalds if (!addrlen) 27761da177e4SLinus Torvalds return NULL; 27771da177e4SLinus Torvalds length += addrlen; 27781da177e4SLinus Torvalds 27791da177e4SLinus Torvalds /* Create the chunk. */ 2780cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length, 2781cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 27821da177e4SLinus Torvalds if (!retval) 27831da177e4SLinus Torvalds return NULL; 27841da177e4SLinus Torvalds 27851da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 27861da177e4SLinus Torvalds 27871da177e4SLinus Torvalds retval->subh.addip_hdr = 27881da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 27891da177e4SLinus Torvalds retval->param_hdr.v = 27901da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 27911da177e4SLinus Torvalds 27921da177e4SLinus Torvalds return retval; 27931da177e4SLinus Torvalds } 27941da177e4SLinus Torvalds 27951da177e4SLinus Torvalds /* ADDIP 27961da177e4SLinus Torvalds * 3.2.1 Add IP Address 27971da177e4SLinus Torvalds * 0 1 2 3 27981da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 27991da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28001da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 28011da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28021da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28031da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28041da177e4SLinus Torvalds * | Address Parameter | 28051da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28061da177e4SLinus Torvalds * 28071da177e4SLinus Torvalds * 3.2.2 Delete IP Address 28081da177e4SLinus Torvalds * 0 1 2 3 28091da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 28101da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28111da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 28121da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28131da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28141da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28151da177e4SLinus Torvalds * | Address Parameter | 28161da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28171da177e4SLinus Torvalds * 28181da177e4SLinus Torvalds */ 28191da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 28201da177e4SLinus Torvalds union sctp_addr *laddr, 28211da177e4SLinus Torvalds struct sockaddr *addrs, 2822327c0dabSXin Long int addrcnt, __be16 flags) 28231da177e4SLinus Torvalds { 28241da177e4SLinus Torvalds union sctp_addr_param addr_param; 2825327c0dabSXin Long struct sctp_addip_param param; 28261da177e4SLinus Torvalds int paramlen = sizeof(param); 2827327c0dabSXin Long struct sctp_chunk *retval; 28281da177e4SLinus Torvalds int addr_param_len = 0; 2829327c0dabSXin Long union sctp_addr *addr; 2830327c0dabSXin Long int totallen = 0, i; 28318a07eb0aSMichio Honda int del_pickup = 0; 2832327c0dabSXin Long struct sctp_af *af; 2833327c0dabSXin Long void *addr_buf; 28341da177e4SLinus Torvalds 28351da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 28361da177e4SLinus Torvalds addr_buf = addrs; 28371da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2838ea110733SJoe Perches addr = addr_buf; 28391da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28401da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28411da177e4SLinus Torvalds 28421da177e4SLinus Torvalds totallen += paramlen; 28431da177e4SLinus Torvalds totallen += addr_param_len; 28441da177e4SLinus Torvalds 28451da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28468a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending && !del_pickup) { 28478a07eb0aSMichio Honda /* reuse the parameter length from the same scope one */ 28488a07eb0aSMichio Honda totallen += paramlen; 28498a07eb0aSMichio Honda totallen += addr_param_len; 28508a07eb0aSMichio Honda del_pickup = 1; 2851bb33381dSDaniel Borkmann 2852bb33381dSDaniel Borkmann pr_debug("%s: picked same-scope del_pending addr, " 2853bb33381dSDaniel Borkmann "totallen for all addresses is %d\n", 2854bb33381dSDaniel Borkmann __func__, totallen); 28558a07eb0aSMichio Honda } 28561da177e4SLinus Torvalds } 28571da177e4SLinus Torvalds 28581da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 28591da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 28601da177e4SLinus Torvalds if (!retval) 28611da177e4SLinus Torvalds return NULL; 28621da177e4SLinus Torvalds 28631da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 28641da177e4SLinus Torvalds addr_buf = addrs; 28651da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2866ea110733SJoe Perches addr = addr_buf; 28671da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28681da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28691da177e4SLinus Torvalds param.param_hdr.type = flags; 28701da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 2871978aa047SXin Long param.crr_id = htonl(i); 28721da177e4SLinus Torvalds 28731da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 28741da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 28751da177e4SLinus Torvalds 28761da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28771da177e4SLinus Torvalds } 28788a07eb0aSMichio Honda if (flags == SCTP_PARAM_ADD_IP && del_pickup) { 28798a07eb0aSMichio Honda addr = asoc->asconf_addr_del_pending; 28808a07eb0aSMichio Honda af = sctp_get_af_specific(addr->v4.sin_family); 28818a07eb0aSMichio Honda addr_param_len = af->to_addr_param(addr, &addr_param); 28828a07eb0aSMichio Honda param.param_hdr.type = SCTP_PARAM_DEL_IP; 28838a07eb0aSMichio Honda param.param_hdr.length = htons(paramlen + addr_param_len); 2884978aa047SXin Long param.crr_id = htonl(i); 28858a07eb0aSMichio Honda 28868a07eb0aSMichio Honda sctp_addto_chunk(retval, paramlen, ¶m); 28878a07eb0aSMichio Honda sctp_addto_chunk(retval, addr_param_len, &addr_param); 28888a07eb0aSMichio Honda } 28891da177e4SLinus Torvalds return retval; 28901da177e4SLinus Torvalds } 28911da177e4SLinus Torvalds 28921da177e4SLinus Torvalds /* ADDIP 28931da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 28941da177e4SLinus Torvalds * 0 1 2 3 28951da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 28961da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28971da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 28981da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28991da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 29001da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29011da177e4SLinus Torvalds * | Address Parameter | 29021da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29031da177e4SLinus Torvalds * 29041da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 29051da177e4SLinus Torvalds */ 29061da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 29071da177e4SLinus Torvalds union sctp_addr *addr) 29081da177e4SLinus Torvalds { 2909327c0dabSXin Long struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 2910327c0dabSXin Long union sctp_addr_param addrparam; 29118b32f234SXin Long struct sctp_addip_param param; 29121da177e4SLinus Torvalds struct sctp_chunk *retval; 29131da177e4SLinus Torvalds int len = sizeof(param); 29141da177e4SLinus Torvalds int addrlen; 29151da177e4SLinus Torvalds 29161da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 29171da177e4SLinus Torvalds if (!addrlen) 29181da177e4SLinus Torvalds return NULL; 29191da177e4SLinus Torvalds len += addrlen; 29201da177e4SLinus Torvalds 29211da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 29221da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 29231da177e4SLinus Torvalds if (!retval) 29241da177e4SLinus Torvalds return NULL; 29251da177e4SLinus Torvalds 29261da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 29271da177e4SLinus Torvalds param.param_hdr.length = htons(len); 29281da177e4SLinus Torvalds param.crr_id = 0; 29291da177e4SLinus Torvalds 29301da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 29311da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 29321da177e4SLinus Torvalds 29331da177e4SLinus Torvalds return retval; 29341da177e4SLinus Torvalds } 29351da177e4SLinus Torvalds 29361da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 29371da177e4SLinus Torvalds * 0 1 2 3 29381da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 29391da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29401da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 29411da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29421da177e4SLinus Torvalds * | Serial Number | 29431da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29441da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 29451da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29461da177e4SLinus Torvalds * \ \ 29471da177e4SLinus Torvalds * / .... / 29481da177e4SLinus Torvalds * \ \ 29491da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29501da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 29511da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29521da177e4SLinus Torvalds * 29531da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 29541da177e4SLinus Torvalds */ 29551da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 29561da177e4SLinus Torvalds __u32 serial, int vparam_len) 29571da177e4SLinus Torvalds { 295865205cc4SXin Long struct sctp_addiphdr asconf; 29591da177e4SLinus Torvalds struct sctp_chunk *retval; 29601da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 29611da177e4SLinus Torvalds 29621da177e4SLinus Torvalds /* Create the chunk. */ 2963cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length, 2964cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 29651da177e4SLinus Torvalds if (!retval) 29661da177e4SLinus Torvalds return NULL; 29671da177e4SLinus Torvalds 29681da177e4SLinus Torvalds asconf.serial = htonl(serial); 29691da177e4SLinus Torvalds 29701da177e4SLinus Torvalds retval->subh.addip_hdr = 29711da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 29721da177e4SLinus Torvalds 29731da177e4SLinus Torvalds return retval; 29741da177e4SLinus Torvalds } 29751da177e4SLinus Torvalds 29761da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 29779f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 29788b32f234SXin Long __be16 err_code, 29798b32f234SXin Long struct sctp_addip_param *asconf_param) 29801da177e4SLinus Torvalds { 29818b32f234SXin Long struct sctp_addip_param ack_param; 2982d8238d9dSXin Long struct sctp_errhdr err_param; 29831da177e4SLinus Torvalds int asconf_param_len = 0; 29841da177e4SLinus Torvalds int err_param_len = 0; 2985dbc16db1SAl Viro __be16 response_type; 29861da177e4SLinus Torvalds 29871da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 29881da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 29891da177e4SLinus Torvalds } else { 29901da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 29911da177e4SLinus Torvalds err_param_len = sizeof(err_param); 29921da177e4SLinus Torvalds if (asconf_param) 29931da177e4SLinus Torvalds asconf_param_len = 29941da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 29951da177e4SLinus Torvalds } 29961da177e4SLinus Torvalds 29971da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 29981da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 29991da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 30001da177e4SLinus Torvalds err_param_len + 30011da177e4SLinus Torvalds asconf_param_len); 30021da177e4SLinus Torvalds ack_param.crr_id = crr_id; 30031da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 30041da177e4SLinus Torvalds 30051da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 30061da177e4SLinus Torvalds return; 30071da177e4SLinus Torvalds 30081da177e4SLinus Torvalds /* Add Error Cause parameter. */ 30091da177e4SLinus Torvalds err_param.cause = err_code; 30101da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 30111da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 30121da177e4SLinus Torvalds 30131da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 30141da177e4SLinus Torvalds if (asconf_param) 30151da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 30161da177e4SLinus Torvalds } 30171da177e4SLinus Torvalds 30181da177e4SLinus Torvalds /* Process a asconf parameter. */ 3019dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 30201da177e4SLinus Torvalds struct sctp_chunk *asconf, 30218b32f234SXin Long struct sctp_addip_param *asconf_param) 30221da177e4SLinus Torvalds { 30231da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3024327c0dabSXin Long struct sctp_transport *peer; 3025327c0dabSXin Long union sctp_addr addr; 3026327c0dabSXin Long struct sctp_af *af; 30271da177e4SLinus Torvalds 30288b32f234SXin Long addr_param = (void *)asconf_param + sizeof(*asconf_param); 3029c1cc678aSPatrick McHardy 303044e65c1eSWei Yongjun if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && 303144e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && 303244e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) 303344e65c1eSWei Yongjun return SCTP_ERROR_UNKNOWN_PARAM; 303444e65c1eSWei Yongjun 30356a435732SShan Wei switch (addr_param->p.type) { 3036c4492586SWei Yongjun case SCTP_PARAM_IPV6_ADDRESS: 3037c4492586SWei Yongjun if (!asoc->peer.ipv6_address) 3038945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3039c4492586SWei Yongjun break; 3040c4492586SWei Yongjun case SCTP_PARAM_IPV4_ADDRESS: 3041c4492586SWei Yongjun if (!asoc->peer.ipv4_address) 3042945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3043c4492586SWei Yongjun break; 3044c4492586SWei Yongjun default: 3045945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3046c4492586SWei Yongjun } 3047c4492586SWei Yongjun 30486a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 30491da177e4SLinus Torvalds if (unlikely(!af)) 3050945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 30511da177e4SLinus Torvalds 3052dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); 305342e30bf3SVlad Yasevich 305442e30bf3SVlad Yasevich /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast 305542e30bf3SVlad Yasevich * or multicast address. 305642e30bf3SVlad Yasevich * (note: wildcard is permitted and requires special handling so 305742e30bf3SVlad Yasevich * make sure we check for that) 305842e30bf3SVlad Yasevich */ 305942e30bf3SVlad Yasevich if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) 3060945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 306142e30bf3SVlad Yasevich 30621da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 30631da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 306442e30bf3SVlad Yasevich /* Section 4.2.1: 306542e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the source 306642e30bf3SVlad Yasevich * address of the packet MUST be added. 306742e30bf3SVlad Yasevich */ 306842e30bf3SVlad Yasevich if (af->is_any(&addr)) 306942e30bf3SVlad Yasevich memcpy(&addr, &asconf->source, sizeof(addr)); 307042e30bf3SVlad Yasevich 30712277c7cdSRichard Haines if (security_sctp_bind_connect(asoc->ep->base.sk, 30722277c7cdSRichard Haines SCTP_PARAM_ADD_IP, 30732277c7cdSRichard Haines (struct sockaddr *)&addr, 30742277c7cdSRichard Haines af->sockaddr_len)) 30752277c7cdSRichard Haines return SCTP_ERROR_REQ_REFUSED; 30762277c7cdSRichard Haines 30771da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 30781da177e4SLinus Torvalds * request and does not have the local resources to add this 30791da177e4SLinus Torvalds * new address to the association, it MUST return an Error 30801da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 30811da177e4SLinus Torvalds * Due to Resource Shortage'. 30821da177e4SLinus Torvalds */ 30831da177e4SLinus Torvalds 3084dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 30851da177e4SLinus Torvalds if (!peer) 30861da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 30871da177e4SLinus Torvalds 30881da177e4SLinus Torvalds /* Start the heartbeat timer. */ 3089ba6f5e33SMarcelo Ricardo Leitner sctp_transport_reset_hb_timer(peer); 30906af29cccSMichio Honda asoc->new_transport = peer; 30911da177e4SLinus Torvalds break; 30921da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 30931da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 30941da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 30951da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 30961da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 30971da177e4SLinus Torvalds */ 309842e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 30991da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 31001da177e4SLinus Torvalds 31011da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 31021da177e4SLinus Torvalds * address which is also the source address of the IP packet 31031da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 31041da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 31051da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 31061da177e4SLinus Torvalds * Delete Source IP Address' 31071da177e4SLinus Torvalds */ 3108b1364104SMichio Honda if (sctp_cmp_addr_exact(&asconf->source, &addr)) 31091da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 31101da177e4SLinus Torvalds 311142e30bf3SVlad Yasevich /* Section 4.2.2 311242e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 311342e30bf3SVlad Yasevich * addresses of the peer except the source address of the 311442e30bf3SVlad Yasevich * packet MUST be deleted. 311542e30bf3SVlad Yasevich */ 311642e30bf3SVlad Yasevich if (af->is_any(&addr)) { 311742e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 311842e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 311942e30bf3SVlad Yasevich asconf->transport); 31207c5a9461Slucien return SCTP_ERROR_NO_ERROR; 31217c5a9461Slucien } 31227c5a9461Slucien 31237c5a9461Slucien /* If the address is not part of the association, the 31247c5a9461Slucien * ASCONF-ACK with Error Cause Indication Parameter 31257c5a9461Slucien * which including cause of Unresolvable Address should 31267c5a9461Slucien * be sent. 31277c5a9461Slucien */ 31287c5a9461Slucien peer = sctp_assoc_lookup_paddr(asoc, &addr); 31297c5a9461Slucien if (!peer) 31307c5a9461Slucien return SCTP_ERROR_DNS_FAILED; 31317c5a9461Slucien 31327c5a9461Slucien sctp_assoc_rm_peer(asoc, peer); 31331da177e4SLinus Torvalds break; 31341da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 313542e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 313642e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 313742e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 313842e30bf3SVlad Yasevich * primary. 313942e30bf3SVlad Yasevich */ 314042e30bf3SVlad Yasevich if (af->is_any(&addr)) 314142e30bf3SVlad Yasevich memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); 314242e30bf3SVlad Yasevich 31432277c7cdSRichard Haines if (security_sctp_bind_connect(asoc->ep->base.sk, 31442277c7cdSRichard Haines SCTP_PARAM_SET_PRIMARY, 31452277c7cdSRichard Haines (struct sockaddr *)&addr, 31462277c7cdSRichard Haines af->sockaddr_len)) 31472277c7cdSRichard Haines return SCTP_ERROR_REQ_REFUSED; 31482277c7cdSRichard Haines 3149dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 31501da177e4SLinus Torvalds if (!peer) 3151945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 31521da177e4SLinus Torvalds 31531da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 31541da177e4SLinus Torvalds break; 31551da177e4SLinus Torvalds } 31561da177e4SLinus Torvalds 31571da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 31581da177e4SLinus Torvalds } 31591da177e4SLinus Torvalds 31606f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 31619de7922bSDaniel Borkmann bool sctp_verify_asconf(const struct sctp_association *asoc, 31629de7922bSDaniel Borkmann struct sctp_chunk *chunk, bool addr_param_needed, 31639de7922bSDaniel Borkmann struct sctp_paramhdr **errp) 31649de7922bSDaniel Borkmann { 316568d75469SXin Long struct sctp_addip_chunk *addip; 31669de7922bSDaniel Borkmann bool addr_param_seen = false; 3167327c0dabSXin Long union sctp_params param; 31686f4c618dSWei Yongjun 316968d75469SXin Long addip = (struct sctp_addip_chunk *)chunk->chunk_hdr; 31709de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 31719de7922bSDaniel Borkmann size_t length = ntohs(param.p->length); 31729de7922bSDaniel Borkmann 31736f4c618dSWei Yongjun *errp = param.p; 31746f4c618dSWei Yongjun switch (param.p->type) { 31759de7922bSDaniel Borkmann case SCTP_PARAM_ERR_CAUSE: 31769de7922bSDaniel Borkmann break; 31779de7922bSDaniel Borkmann case SCTP_PARAM_IPV4_ADDRESS: 3178a38905e6SXin Long if (length != sizeof(struct sctp_ipv4addr_param)) 31799de7922bSDaniel Borkmann return false; 3180ce7b4cccSlucien /* ensure there is only one addr param and it's in the 3181ce7b4cccSlucien * beginning of addip_hdr params, or we reject it. 3182ce7b4cccSlucien */ 3183ce7b4cccSlucien if (param.v != addip->addip_hdr.params) 3184ce7b4cccSlucien return false; 31859de7922bSDaniel Borkmann addr_param_seen = true; 31869de7922bSDaniel Borkmann break; 31879de7922bSDaniel Borkmann case SCTP_PARAM_IPV6_ADDRESS: 318800987cc0SXin Long if (length != sizeof(struct sctp_ipv6addr_param)) 31899de7922bSDaniel Borkmann return false; 3190ce7b4cccSlucien if (param.v != addip->addip_hdr.params) 3191ce7b4cccSlucien return false; 31929de7922bSDaniel Borkmann addr_param_seen = true; 31939de7922bSDaniel Borkmann break; 31946f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 31956f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 31966f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 31979de7922bSDaniel Borkmann /* In ASCONF chunks, these need to be first. */ 31989de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 31999de7922bSDaniel Borkmann return false; 32009de7922bSDaniel Borkmann length = ntohs(param.addip->param_hdr.length); 32018b32f234SXin Long if (length < sizeof(struct sctp_addip_param) + 32023c918704SXin Long sizeof(**errp)) 32039de7922bSDaniel Borkmann return false; 32046f4c618dSWei Yongjun break; 32056f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 32066f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 32078b32f234SXin Long if (length != sizeof(struct sctp_addip_param)) 32089de7922bSDaniel Borkmann return false; 32096f4c618dSWei Yongjun break; 32106f4c618dSWei Yongjun default: 32119de7922bSDaniel Borkmann /* This is unkown to us, reject! */ 32129de7922bSDaniel Borkmann return false; 32139de7922bSDaniel Borkmann } 32146f4c618dSWei Yongjun } 32156f4c618dSWei Yongjun 32169de7922bSDaniel Borkmann /* Remaining sanity checks. */ 32179de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 32189de7922bSDaniel Borkmann return false; 32199de7922bSDaniel Borkmann if (!addr_param_needed && addr_param_seen) 32209de7922bSDaniel Borkmann return false; 32219de7922bSDaniel Borkmann if (param.v != chunk->chunk_end) 32229de7922bSDaniel Borkmann return false; 32236f4c618dSWei Yongjun 32249de7922bSDaniel Borkmann return true; 32256f4c618dSWei Yongjun } 32266f4c618dSWei Yongjun 32271da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 32281da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 32291da177e4SLinus Torvalds */ 32301da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 32311da177e4SLinus Torvalds struct sctp_chunk *asconf) 32321da177e4SLinus Torvalds { 32331da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3234327c0dabSXin Long struct sctp_addip_chunk *addip; 32351da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 3236327c0dabSXin Long bool all_param_pass = true; 3237327c0dabSXin Long struct sctp_addiphdr *hdr; 3238327c0dabSXin Long int length = 0, chunk_len; 3239327c0dabSXin Long union sctp_params param; 3240dbc16db1SAl Viro __be16 err_code; 32411da177e4SLinus Torvalds __u32 serial; 32421da177e4SLinus Torvalds 324368d75469SXin Long addip = (struct sctp_addip_chunk *)asconf->chunk_hdr; 3244922dbc5bSXin Long chunk_len = ntohs(asconf->chunk_hdr->length) - 3245922dbc5bSXin Long sizeof(struct sctp_chunkhdr); 324665205cc4SXin Long hdr = (struct sctp_addiphdr *)asconf->skb->data; 32471da177e4SLinus Torvalds serial = ntohl(hdr->serial); 32481da177e4SLinus Torvalds 32491da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 325065205cc4SXin Long length = sizeof(*hdr); 32511da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 32521da177e4SLinus Torvalds chunk_len -= length; 32531da177e4SLinus Torvalds 32541da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 32557aa1b54bSJoe Perches * asconf parameter. 32561da177e4SLinus Torvalds */ 32576a435732SShan Wei length = ntohs(addr_param->p.length); 32581da177e4SLinus Torvalds chunk_len -= length; 32591da177e4SLinus Torvalds 32601da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 32611da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 32622cab86beSWei Yongjun * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF 32637aa1b54bSJoe Perches * parameters. 32641da177e4SLinus Torvalds */ 32652cab86beSWei Yongjun asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); 32661da177e4SLinus Torvalds if (!asconf_ack) 32671da177e4SLinus Torvalds goto done; 32681da177e4SLinus Torvalds 32691da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 32709de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 32719de7922bSDaniel Borkmann /* Skip preceeding address parameters. */ 32729de7922bSDaniel Borkmann if (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 32739de7922bSDaniel Borkmann param.p->type == SCTP_PARAM_IPV6_ADDRESS) 32749de7922bSDaniel Borkmann continue; 32759de7922bSDaniel Borkmann 32761da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 32779de7922bSDaniel Borkmann param.addip); 32781da177e4SLinus Torvalds /* ADDIP 4.1 A7) 32791da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 32801da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 32811da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 32821da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 32831da177e4SLinus Torvalds * a specific success indication is present for the parameter. 32841da177e4SLinus Torvalds */ 32859de7922bSDaniel Borkmann if (err_code != SCTP_ERROR_NO_ERROR) 32869de7922bSDaniel Borkmann all_param_pass = false; 32871da177e4SLinus Torvalds if (!all_param_pass) 32889de7922bSDaniel Borkmann sctp_add_asconf_response(asconf_ack, param.addip->crr_id, 32899de7922bSDaniel Borkmann err_code, param.addip); 32901da177e4SLinus Torvalds 32911da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 32921da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 32931da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 32941da177e4SLinus Torvalds * in the ASCONF. 32951da177e4SLinus Torvalds */ 32969de7922bSDaniel Borkmann if (err_code == SCTP_ERROR_RSRC_LOW) 32971da177e4SLinus Torvalds goto done; 32981da177e4SLinus Torvalds } 32991da177e4SLinus Torvalds done: 33001da177e4SLinus Torvalds asoc->peer.addip_serial++; 33011da177e4SLinus Torvalds 33021da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 33031da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 33041da177e4SLinus Torvalds */ 33051da177e4SLinus Torvalds if (asconf_ack) { 33061da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3307a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3308a08de64dSVlad Yasevich &asoc->asconf_ack_list); 33091da177e4SLinus Torvalds } 33101da177e4SLinus Torvalds 33111da177e4SLinus Torvalds return asconf_ack; 33121da177e4SLinus Torvalds } 33131da177e4SLinus Torvalds 33141da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 3315425e0f68SWei Yongjun static void sctp_asconf_param_success(struct sctp_association *asoc, 33168b32f234SXin Long struct sctp_addip_param *asconf_param) 33171da177e4SLinus Torvalds { 33181da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 33191da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3320dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 3321327c0dabSXin Long struct sctp_transport *transport; 3322327c0dabSXin Long union sctp_addr addr; 3323327c0dabSXin Long struct sctp_af *af; 33241da177e4SLinus Torvalds 33258b32f234SXin Long addr_param = (void *)asconf_param + sizeof(*asconf_param); 33261da177e4SLinus Torvalds 33271da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 33286a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 3329dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 33301da177e4SLinus Torvalds 33311da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 33321da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3333559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3334559cf710SVlad Yasevich * held, so the list can not change. 3335559cf710SVlad Yasevich */ 33360ed90fb0SVlad Yasevich local_bh_disable(); 3337559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3338dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3339f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3340dc022a98SSridhar Samudrala } 33410ed90fb0SVlad Yasevich local_bh_enable(); 33423cd9749cSWei Yongjun list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33433cd9749cSWei Yongjun transports) { 3344c86a773cSJulian Anastasov sctp_transport_dst_release(transport); 33453cd9749cSWei Yongjun } 33461da177e4SLinus Torvalds break; 33471da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 33480ed90fb0SVlad Yasevich local_bh_disable(); 3349425e0f68SWei Yongjun sctp_del_bind_addr(bp, &addr); 33508a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending != NULL && 33518a07eb0aSMichio Honda sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { 33528a07eb0aSMichio Honda kfree(asoc->asconf_addr_del_pending); 33538a07eb0aSMichio Honda asoc->asconf_addr_del_pending = NULL; 33548a07eb0aSMichio Honda } 33550ed90fb0SVlad Yasevich local_bh_enable(); 33569dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33579dbc15f0SRobert P. J. Day transports) { 3358c86a773cSJulian Anastasov sctp_transport_dst_release(transport); 33591da177e4SLinus Torvalds } 33601da177e4SLinus Torvalds break; 33611da177e4SLinus Torvalds default: 33621da177e4SLinus Torvalds break; 33631da177e4SLinus Torvalds } 33641da177e4SLinus Torvalds } 33651da177e4SLinus Torvalds 33661da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 33671da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 33681da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 33691da177e4SLinus Torvalds * ADDIP 4.1 33701da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 33711da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 33721da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 33731da177e4SLinus Torvalds * specific success indication is present for the parameter. 33741da177e4SLinus Torvalds */ 3375dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 33768b32f234SXin Long struct sctp_addip_param *asconf_param, 33771da177e4SLinus Torvalds int no_err) 33781da177e4SLinus Torvalds { 33798b32f234SXin Long struct sctp_addip_param *asconf_ack_param; 3380d8238d9dSXin Long struct sctp_errhdr *err_param; 3381f3830cccSWei Yongjun int asconf_ack_len; 3382dbc16db1SAl Viro __be16 err_code; 3383327c0dabSXin Long int length; 33841da177e4SLinus Torvalds 33851da177e4SLinus Torvalds if (no_err) 33861da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 33871da177e4SLinus Torvalds else 33881da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 33891da177e4SLinus Torvalds 3390f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3391922dbc5bSXin Long sizeof(struct sctp_chunkhdr); 3392f3830cccSWei Yongjun 33931da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 33941da177e4SLinus Torvalds * the first asconf_ack parameter. 33951da177e4SLinus Torvalds */ 339665205cc4SXin Long length = sizeof(struct sctp_addiphdr); 33978b32f234SXin Long asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data + 33981da177e4SLinus Torvalds length); 33991da177e4SLinus Torvalds asconf_ack_len -= length; 34001da177e4SLinus Torvalds 34011da177e4SLinus Torvalds while (asconf_ack_len > 0) { 34021da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 34031da177e4SLinus Torvalds switch (asconf_ack_param->param_hdr.type) { 34041da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 34051da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 34061da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 34078b32f234SXin Long length = sizeof(*asconf_ack_param); 3408ea110733SJoe Perches err_param = (void *)asconf_ack_param + length; 34091da177e4SLinus Torvalds asconf_ack_len -= length; 34101da177e4SLinus Torvalds if (asconf_ack_len > 0) 34111da177e4SLinus Torvalds return err_param->cause; 34121da177e4SLinus Torvalds else 34131da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 34141da177e4SLinus Torvalds break; 34151da177e4SLinus Torvalds default: 34161da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 34171da177e4SLinus Torvalds } 34181da177e4SLinus Torvalds } 34191da177e4SLinus Torvalds 34201da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 3421ea110733SJoe Perches asconf_ack_param = (void *)asconf_ack_param + length; 34221da177e4SLinus Torvalds asconf_ack_len -= length; 34231da177e4SLinus Torvalds } 34241da177e4SLinus Torvalds 34251da177e4SLinus Torvalds return err_code; 34261da177e4SLinus Torvalds } 34271da177e4SLinus Torvalds 34281da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 34291da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 34301da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 34311da177e4SLinus Torvalds { 34321da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 34338b32f234SXin Long struct sctp_addip_param *asconf_param; 3434327c0dabSXin Long __be16 err_code = SCTP_ERROR_NO_ERROR; 3435327c0dabSXin Long union sctp_addr_param *addr_param; 34361da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 34371da177e4SLinus Torvalds int all_param_pass = 0; 3438327c0dabSXin Long int length = 0; 34391da177e4SLinus Torvalds int no_err = 1; 34401da177e4SLinus Torvalds int retval = 0; 34411da177e4SLinus Torvalds 34421da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 34431da177e4SLinus Torvalds * a pointer to address parameter. 34441da177e4SLinus Torvalds */ 344568d75469SXin Long length = sizeof(struct sctp_addip_chunk); 34461da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 34471da177e4SLinus Torvalds asconf_len -= length; 34481da177e4SLinus Torvalds 34491da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 34507aa1b54bSJoe Perches * pointer to the first asconf parameter. 34511da177e4SLinus Torvalds */ 34526a435732SShan Wei length = ntohs(addr_param->p.length); 3453ea110733SJoe Perches asconf_param = (void *)addr_param + length; 34541da177e4SLinus Torvalds asconf_len -= length; 34551da177e4SLinus Torvalds 34561da177e4SLinus Torvalds /* ADDIP 4.1 34571da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 34581da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 34591da177e4SLinus Torvalds * successful. 34601da177e4SLinus Torvalds */ 346165205cc4SXin Long if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr)) 34621da177e4SLinus Torvalds all_param_pass = 1; 34631da177e4SLinus Torvalds 34641da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 34651da177e4SLinus Torvalds while (asconf_len > 0) { 34661da177e4SLinus Torvalds if (all_param_pass) 34671da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 34681da177e4SLinus Torvalds else { 34691da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 34701da177e4SLinus Torvalds asconf_param, 34711da177e4SLinus Torvalds no_err); 34721da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 34731da177e4SLinus Torvalds no_err = 0; 34741da177e4SLinus Torvalds } 34751da177e4SLinus Torvalds 34761da177e4SLinus Torvalds switch (err_code) { 34771da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 3478425e0f68SWei Yongjun sctp_asconf_param_success(asoc, asconf_param); 34791da177e4SLinus Torvalds break; 34801da177e4SLinus Torvalds 34811da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 34821da177e4SLinus Torvalds retval = 1; 34831da177e4SLinus Torvalds break; 34841da177e4SLinus Torvalds 3485a987f762SWei Yongjun case SCTP_ERROR_UNKNOWN_PARAM: 34861da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 34871da177e4SLinus Torvalds * future. 34881da177e4SLinus Torvalds */ 34891da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 34901da177e4SLinus Torvalds asconf_param->param_hdr.type; 34911da177e4SLinus Torvalds break; 34921da177e4SLinus Torvalds 34931da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 34941da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 34951da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 34961da177e4SLinus Torvalds default: 34971da177e4SLinus Torvalds break; 34981da177e4SLinus Torvalds } 34991da177e4SLinus Torvalds 35001da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 35011da177e4SLinus Torvalds * one. 35021da177e4SLinus Torvalds */ 35031da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3504ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 35051da177e4SLinus Torvalds asconf_len -= length; 35061da177e4SLinus Torvalds } 35071da177e4SLinus Torvalds 3508ddc4bbeeSMichio Honda if (no_err && asoc->src_out_of_asoc_ok) { 35098a07eb0aSMichio Honda asoc->src_out_of_asoc_ok = 0; 3510ddc4bbeeSMichio Honda sctp_transport_immediate_rtx(asoc->peer.primary_path); 3511ddc4bbeeSMichio Honda } 35128a07eb0aSMichio Honda 35131da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 35145f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 35151da177e4SLinus Torvalds sctp_chunk_free(asconf); 35161da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 35171da177e4SLinus Torvalds 35181da177e4SLinus Torvalds return retval; 35191da177e4SLinus Torvalds } 35201da177e4SLinus Torvalds 35211da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 35221da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 35231da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 35241da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 35251da177e4SLinus Torvalds { 35261da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 35271da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 35281da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 35291da177e4SLinus Torvalds size_t hint; 35301da177e4SLinus Torvalds int i; 35311da177e4SLinus Torvalds 35321da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 35331da177e4SLinus Torvalds 3534cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC); 35351da177e4SLinus Torvalds 35361da177e4SLinus Torvalds if (!retval) 35371da177e4SLinus Torvalds return NULL; 35381da177e4SLinus Torvalds 35391da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 35401da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 35411da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 35421da177e4SLinus Torvalds 35431da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 35441da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 35451da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 35461da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 35471da177e4SLinus Torvalds } 35481da177e4SLinus Torvalds 35491da177e4SLinus Torvalds return retval; 35501da177e4SLinus Torvalds } 3551cc16f00fSXin Long 35522d07a49aSXin Long struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc, 35532d07a49aSXin Long __u32 new_cum_tsn, size_t nstreams, 35542d07a49aSXin Long struct sctp_ifwdtsn_skip *skiplist) 35552d07a49aSXin Long { 35562d07a49aSXin Long struct sctp_chunk *retval = NULL; 35572d07a49aSXin Long struct sctp_ifwdtsn_hdr ftsn_hdr; 35582d07a49aSXin Long size_t hint; 35592d07a49aSXin Long 35602d07a49aSXin Long hint = (nstreams + 1) * sizeof(__u32); 35612d07a49aSXin Long 35622d07a49aSXin Long retval = sctp_make_control(asoc, SCTP_CID_I_FWD_TSN, 0, hint, 35632d07a49aSXin Long GFP_ATOMIC); 35642d07a49aSXin Long if (!retval) 35652d07a49aSXin Long return NULL; 35662d07a49aSXin Long 35672d07a49aSXin Long ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 35682d07a49aSXin Long retval->subh.ifwdtsn_hdr = 35692d07a49aSXin Long sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 35702d07a49aSXin Long 35712d07a49aSXin Long sctp_addto_chunk(retval, nstreams * sizeof(skiplist[0]), skiplist); 35722d07a49aSXin Long 35732d07a49aSXin Long return retval; 35742d07a49aSXin Long } 35752d07a49aSXin Long 3576cc16f00fSXin Long /* RE-CONFIG 3.1 (RE-CONFIG chunk) 3577cc16f00fSXin Long * 0 1 2 3 3578cc16f00fSXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3579cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3580cc16f00fSXin Long * | Type = 130 | Chunk Flags | Chunk Length | 3581cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3582cc16f00fSXin Long * \ \ 3583cc16f00fSXin Long * / Re-configuration Parameter / 3584cc16f00fSXin Long * \ \ 3585cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3586cc16f00fSXin Long * \ \ 3587cc16f00fSXin Long * / Re-configuration Parameter (optional) / 3588cc16f00fSXin Long * \ \ 3589cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3590cc16f00fSXin Long */ 3591327c0dabSXin Long static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc, 3592cc16f00fSXin Long int length) 3593cc16f00fSXin Long { 3594cc16f00fSXin Long struct sctp_reconf_chunk *reconf; 3595cc16f00fSXin Long struct sctp_chunk *retval; 3596cc16f00fSXin Long 3597cc16f00fSXin Long retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length, 3598cc16f00fSXin Long GFP_ATOMIC); 3599cc16f00fSXin Long if (!retval) 3600cc16f00fSXin Long return NULL; 3601cc16f00fSXin Long 3602cc16f00fSXin Long reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr; 3603cc16f00fSXin Long retval->param_hdr.v = reconf->params; 3604cc16f00fSXin Long 3605cc16f00fSXin Long return retval; 3606cc16f00fSXin Long } 3607cc16f00fSXin Long 3608cc16f00fSXin Long /* RE-CONFIG 4.1 (STREAM OUT RESET) 3609cc16f00fSXin Long * 0 1 2 3 3610cc16f00fSXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3611cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3612cc16f00fSXin Long * | Parameter Type = 13 | Parameter Length = 16 + 2 * N | 3613cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3614cc16f00fSXin Long * | Re-configuration Request Sequence Number | 3615cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3616cc16f00fSXin Long * | Re-configuration Response Sequence Number | 3617cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3618cc16f00fSXin Long * | Sender's Last Assigned TSN | 3619cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3620cc16f00fSXin Long * | Stream Number 1 (optional) | Stream Number 2 (optional) | 3621cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3622cc16f00fSXin Long * / ...... / 3623cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3624cc16f00fSXin Long * | Stream Number N-1 (optional) | Stream Number N (optional) | 3625cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3626cc16f00fSXin Long * 3627cc16f00fSXin Long * RE-CONFIG 4.2 (STREAM IN RESET) 3628cc16f00fSXin Long * 0 1 2 3 3629cc16f00fSXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3630cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3631cc16f00fSXin Long * | Parameter Type = 14 | Parameter Length = 8 + 2 * N | 3632cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3633cc16f00fSXin Long * | Re-configuration Request Sequence Number | 3634cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3635cc16f00fSXin Long * | Stream Number 1 (optional) | Stream Number 2 (optional) | 3636cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3637cc16f00fSXin Long * / ...... / 3638cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3639cc16f00fSXin Long * | Stream Number N-1 (optional) | Stream Number N (optional) | 3640cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3641cc16f00fSXin Long */ 3642cc16f00fSXin Long struct sctp_chunk *sctp_make_strreset_req( 3643cc16f00fSXin Long const struct sctp_association *asoc, 36441da4fc97SXin Long __u16 stream_num, __be16 *stream_list, 3645cc16f00fSXin Long bool out, bool in) 3646cc16f00fSXin Long { 3647423852f8SXin Long __u16 stream_len = stream_num * sizeof(__u16); 3648cc16f00fSXin Long struct sctp_strreset_outreq outreq; 3649cc16f00fSXin Long struct sctp_strreset_inreq inreq; 3650cc16f00fSXin Long struct sctp_chunk *retval; 365116e1a919SXin Long __u16 outlen, inlen; 3652cc16f00fSXin Long 3653cc16f00fSXin Long outlen = (sizeof(outreq) + stream_len) * out; 3654cc16f00fSXin Long inlen = (sizeof(inreq) + stream_len) * in; 3655cc16f00fSXin Long 3656cc16f00fSXin Long retval = sctp_make_reconf(asoc, outlen + inlen); 3657cc16f00fSXin Long if (!retval) 3658cc16f00fSXin Long return NULL; 3659cc16f00fSXin Long 3660cc16f00fSXin Long if (outlen) { 3661cc16f00fSXin Long outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST; 3662cc16f00fSXin Long outreq.param_hdr.length = htons(outlen); 3663cc16f00fSXin Long outreq.request_seq = htonl(asoc->strreset_outseq); 3664cc16f00fSXin Long outreq.response_seq = htonl(asoc->strreset_inseq - 1); 3665cc16f00fSXin Long outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1); 3666cc16f00fSXin Long 3667cc16f00fSXin Long sctp_addto_chunk(retval, sizeof(outreq), &outreq); 3668cc16f00fSXin Long 3669cc16f00fSXin Long if (stream_len) 3670cc16f00fSXin Long sctp_addto_chunk(retval, stream_len, stream_list); 3671cc16f00fSXin Long } 3672cc16f00fSXin Long 3673cc16f00fSXin Long if (inlen) { 3674cc16f00fSXin Long inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST; 3675cc16f00fSXin Long inreq.param_hdr.length = htons(inlen); 3676cc16f00fSXin Long inreq.request_seq = htonl(asoc->strreset_outseq + out); 3677cc16f00fSXin Long 3678cc16f00fSXin Long sctp_addto_chunk(retval, sizeof(inreq), &inreq); 3679cc16f00fSXin Long 3680cc16f00fSXin Long if (stream_len) 3681cc16f00fSXin Long sctp_addto_chunk(retval, stream_len, stream_list); 3682cc16f00fSXin Long } 3683cc16f00fSXin Long 3684cc16f00fSXin Long return retval; 3685cc16f00fSXin Long } 3686c56480a1SXin Long 3687c56480a1SXin Long /* RE-CONFIG 4.3 (SSN/TSN RESET ALL) 3688c56480a1SXin Long * 0 1 2 3 3689c56480a1SXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3690c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3691c56480a1SXin Long * | Parameter Type = 15 | Parameter Length = 8 | 3692c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3693c56480a1SXin Long * | Re-configuration Request Sequence Number | 3694c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3695c56480a1SXin Long */ 3696c56480a1SXin Long struct sctp_chunk *sctp_make_strreset_tsnreq( 3697c56480a1SXin Long const struct sctp_association *asoc) 3698c56480a1SXin Long { 3699c56480a1SXin Long struct sctp_strreset_tsnreq tsnreq; 3700c56480a1SXin Long __u16 length = sizeof(tsnreq); 3701c56480a1SXin Long struct sctp_chunk *retval; 3702c56480a1SXin Long 3703c56480a1SXin Long retval = sctp_make_reconf(asoc, length); 3704c56480a1SXin Long if (!retval) 3705c56480a1SXin Long return NULL; 3706c56480a1SXin Long 3707c56480a1SXin Long tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST; 3708c56480a1SXin Long tsnreq.param_hdr.length = htons(length); 3709c56480a1SXin Long tsnreq.request_seq = htonl(asoc->strreset_outseq); 3710c56480a1SXin Long 3711c56480a1SXin Long sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq); 3712c56480a1SXin Long 3713c56480a1SXin Long return retval; 3714c56480a1SXin Long } 371578098117SXin Long 371678098117SXin Long /* RE-CONFIG 4.5/4.6 (ADD STREAM) 371778098117SXin Long * 0 1 2 3 371878098117SXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 371978098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 372078098117SXin Long * | Parameter Type = 17 | Parameter Length = 12 | 372178098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 372278098117SXin Long * | Re-configuration Request Sequence Number | 372378098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 372478098117SXin Long * | Number of new streams | Reserved | 372578098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 372678098117SXin Long */ 372778098117SXin Long struct sctp_chunk *sctp_make_strreset_addstrm( 372878098117SXin Long const struct sctp_association *asoc, 372978098117SXin Long __u16 out, __u16 in) 373078098117SXin Long { 373178098117SXin Long struct sctp_strreset_addstrm addstrm; 373278098117SXin Long __u16 size = sizeof(addstrm); 373378098117SXin Long struct sctp_chunk *retval; 373478098117SXin Long 373578098117SXin Long retval = sctp_make_reconf(asoc, (!!out + !!in) * size); 373678098117SXin Long if (!retval) 373778098117SXin Long return NULL; 373878098117SXin Long 373978098117SXin Long if (out) { 374078098117SXin Long addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS; 374178098117SXin Long addstrm.param_hdr.length = htons(size); 374278098117SXin Long addstrm.number_of_streams = htons(out); 374378098117SXin Long addstrm.request_seq = htonl(asoc->strreset_outseq); 374478098117SXin Long addstrm.reserved = 0; 374578098117SXin Long 374678098117SXin Long sctp_addto_chunk(retval, size, &addstrm); 374778098117SXin Long } 374878098117SXin Long 374978098117SXin Long if (in) { 375078098117SXin Long addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS; 375178098117SXin Long addstrm.param_hdr.length = htons(size); 375278098117SXin Long addstrm.number_of_streams = htons(in); 375378098117SXin Long addstrm.request_seq = htonl(asoc->strreset_outseq + !!out); 375478098117SXin Long addstrm.reserved = 0; 375578098117SXin Long 375678098117SXin Long sctp_addto_chunk(retval, size, &addstrm); 375778098117SXin Long } 375878098117SXin Long 375978098117SXin Long return retval; 376078098117SXin Long } 3761bd4b9f8bSXin Long 3762bd4b9f8bSXin Long /* RE-CONFIG 4.4 (RESP) 3763bd4b9f8bSXin Long * 0 1 2 3 3764bd4b9f8bSXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3765bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3766bd4b9f8bSXin Long * | Parameter Type = 16 | Parameter Length | 3767bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3768bd4b9f8bSXin Long * | Re-configuration Response Sequence Number | 3769bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3770bd4b9f8bSXin Long * | Result | 3771bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3772bd4b9f8bSXin Long */ 3773327c0dabSXin Long struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc, 3774bd4b9f8bSXin Long __u32 result, __u32 sn) 3775bd4b9f8bSXin Long { 3776bd4b9f8bSXin Long struct sctp_strreset_resp resp; 3777bd4b9f8bSXin Long __u16 length = sizeof(resp); 3778bd4b9f8bSXin Long struct sctp_chunk *retval; 3779bd4b9f8bSXin Long 3780bd4b9f8bSXin Long retval = sctp_make_reconf(asoc, length); 3781bd4b9f8bSXin Long if (!retval) 3782bd4b9f8bSXin Long return NULL; 3783bd4b9f8bSXin Long 3784bd4b9f8bSXin Long resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; 3785bd4b9f8bSXin Long resp.param_hdr.length = htons(length); 3786bd4b9f8bSXin Long resp.response_seq = htonl(sn); 3787bd4b9f8bSXin Long resp.result = htonl(result); 3788bd4b9f8bSXin Long 3789bd4b9f8bSXin Long sctp_addto_chunk(retval, sizeof(resp), &resp); 3790bd4b9f8bSXin Long 3791bd4b9f8bSXin Long return retval; 3792bd4b9f8bSXin Long } 3793bd4b9f8bSXin Long 3794bd4b9f8bSXin Long /* RE-CONFIG 4.4 OPTIONAL (TSNRESP) 3795bd4b9f8bSXin Long * 0 1 2 3 3796bd4b9f8bSXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3797bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3798bd4b9f8bSXin Long * | Parameter Type = 16 | Parameter Length | 3799bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3800bd4b9f8bSXin Long * | Re-configuration Response Sequence Number | 3801bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3802bd4b9f8bSXin Long * | Result | 3803bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3804bd4b9f8bSXin Long * | Sender's Next TSN (optional) | 3805bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3806bd4b9f8bSXin Long * | Receiver's Next TSN (optional) | 3807bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3808bd4b9f8bSXin Long */ 3809327c0dabSXin Long struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc, 3810bd4b9f8bSXin Long __u32 result, __u32 sn, 3811327c0dabSXin Long __u32 sender_tsn, 3812327c0dabSXin Long __u32 receiver_tsn) 3813bd4b9f8bSXin Long { 3814bd4b9f8bSXin Long struct sctp_strreset_resptsn tsnresp; 3815bd4b9f8bSXin Long __u16 length = sizeof(tsnresp); 3816bd4b9f8bSXin Long struct sctp_chunk *retval; 3817bd4b9f8bSXin Long 3818bd4b9f8bSXin Long retval = sctp_make_reconf(asoc, length); 3819bd4b9f8bSXin Long if (!retval) 3820bd4b9f8bSXin Long return NULL; 3821bd4b9f8bSXin Long 3822bd4b9f8bSXin Long tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; 3823bd4b9f8bSXin Long tsnresp.param_hdr.length = htons(length); 3824bd4b9f8bSXin Long 3825bd4b9f8bSXin Long tsnresp.response_seq = htonl(sn); 3826bd4b9f8bSXin Long tsnresp.result = htonl(result); 3827bd4b9f8bSXin Long tsnresp.senders_next_tsn = htonl(sender_tsn); 3828bd4b9f8bSXin Long tsnresp.receivers_next_tsn = htonl(receiver_tsn); 3829bd4b9f8bSXin Long 3830bd4b9f8bSXin Long sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp); 3831bd4b9f8bSXin Long 3832bd4b9f8bSXin Long return retval; 3833bd4b9f8bSXin Long } 3834ea625043SXin Long 3835ea625043SXin Long bool sctp_verify_reconf(const struct sctp_association *asoc, 3836ea625043SXin Long struct sctp_chunk *chunk, 3837ea625043SXin Long struct sctp_paramhdr **errp) 3838ea625043SXin Long { 3839ea625043SXin Long struct sctp_reconf_chunk *hdr; 3840ea625043SXin Long union sctp_params param; 38411da4fc97SXin Long __be16 last = 0; 38421da4fc97SXin Long __u16 cnt = 0; 3843ea625043SXin Long 3844ea625043SXin Long hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; 3845ea625043SXin Long sctp_walk_params(param, hdr, params) { 3846ea625043SXin Long __u16 length = ntohs(param.p->length); 3847ea625043SXin Long 3848ea625043SXin Long *errp = param.p; 3849ea625043SXin Long if (cnt++ > 2) 3850ea625043SXin Long return false; 3851ea625043SXin Long switch (param.p->type) { 3852ea625043SXin Long case SCTP_PARAM_RESET_OUT_REQUEST: 3853ea625043SXin Long if (length < sizeof(struct sctp_strreset_outreq) || 3854ea625043SXin Long (last && last != SCTP_PARAM_RESET_RESPONSE && 3855ea625043SXin Long last != SCTP_PARAM_RESET_IN_REQUEST)) 3856ea625043SXin Long return false; 3857ea625043SXin Long break; 3858ea625043SXin Long case SCTP_PARAM_RESET_IN_REQUEST: 3859ea625043SXin Long if (length < sizeof(struct sctp_strreset_inreq) || 3860ea625043SXin Long (last && last != SCTP_PARAM_RESET_OUT_REQUEST)) 3861ea625043SXin Long return false; 3862ea625043SXin Long break; 3863ea625043SXin Long case SCTP_PARAM_RESET_RESPONSE: 3864ea625043SXin Long if ((length != sizeof(struct sctp_strreset_resp) && 3865ea625043SXin Long length != sizeof(struct sctp_strreset_resptsn)) || 3866ea625043SXin Long (last && last != SCTP_PARAM_RESET_RESPONSE && 3867ea625043SXin Long last != SCTP_PARAM_RESET_OUT_REQUEST)) 3868ea625043SXin Long return false; 3869ea625043SXin Long break; 3870ea625043SXin Long case SCTP_PARAM_RESET_TSN_REQUEST: 3871ea625043SXin Long if (length != 3872ea625043SXin Long sizeof(struct sctp_strreset_tsnreq) || last) 3873ea625043SXin Long return false; 3874ea625043SXin Long break; 3875ea625043SXin Long case SCTP_PARAM_RESET_ADD_IN_STREAMS: 3876ea625043SXin Long if (length != sizeof(struct sctp_strreset_addstrm) || 3877ea625043SXin Long (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS)) 3878ea625043SXin Long return false; 3879ea625043SXin Long break; 3880ea625043SXin Long case SCTP_PARAM_RESET_ADD_OUT_STREAMS: 3881ea625043SXin Long if (length != sizeof(struct sctp_strreset_addstrm) || 3882ea625043SXin Long (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS)) 3883ea625043SXin Long return false; 3884ea625043SXin Long break; 3885ea625043SXin Long default: 3886ea625043SXin Long return false; 3887ea625043SXin Long } 3888ea625043SXin Long 3889ea625043SXin Long last = param.p->type; 3890ea625043SXin Long } 3891ea625043SXin Long 3892ea625043SXin Long return true; 3893ea625043SXin Long } 3894