147505b8bSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 260c778b2SVlad Yasevich /* SCTP kernel implementation 31da177e4SLinus Torvalds * (C) Copyright IBM Corp. 2001, 2004 41da177e4SLinus Torvalds * Copyright (c) 1999-2000 Cisco, Inc. 51da177e4SLinus Torvalds * Copyright (c) 1999-2001 Motorola, Inc. 61da177e4SLinus Torvalds * Copyright (c) 2001-2002 Intel Corp. 71da177e4SLinus Torvalds * 860c778b2SVlad Yasevich * This file is part of the SCTP kernel implementation 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * These functions work with the state functions in sctp_sm_statefuns.c 111da177e4SLinus Torvalds * to implement the state operations. These functions implement the 121da177e4SLinus Torvalds * steps which require modifying existing data structures. 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * Please send any bug reports or fixes you make to the 151da177e4SLinus Torvalds * email address(es): 1691705c61SDaniel Borkmann * lksctp developers <linux-sctp@vger.kernel.org> 171da177e4SLinus Torvalds * 181da177e4SLinus Torvalds * Written or modified by: 191da177e4SLinus Torvalds * La Monte H.P. Yarroll <piggy@acm.org> 201da177e4SLinus Torvalds * Karl Knutson <karl@athena.chicago.il.us> 211da177e4SLinus Torvalds * C. Robin <chris@hundredacre.ac.uk> 221da177e4SLinus Torvalds * Jon Grimm <jgrimm@us.ibm.com> 231da177e4SLinus Torvalds * Xingang Guo <xingang.guo@intel.com> 241da177e4SLinus Torvalds * Dajiang Zhang <dajiang.zhang@nokia.com> 251da177e4SLinus Torvalds * Sridhar Samudrala <sri@us.ibm.com> 261da177e4SLinus Torvalds * Daisy Chang <daisyc@us.ibm.com> 271da177e4SLinus Torvalds * Ardelle Fan <ardelle.fan@intel.com> 281da177e4SLinus Torvalds * Kevin Gao <kevin.gao@intel.com> 291da177e4SLinus Torvalds */ 301da177e4SLinus Torvalds 31145ce502SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 32145ce502SJoe Perches 335821c769SHerbert Xu #include <crypto/hash.h> 341da177e4SLinus Torvalds #include <linux/types.h> 351da177e4SLinus Torvalds #include <linux/kernel.h> 361da177e4SLinus Torvalds #include <linux/ip.h> 371da177e4SLinus Torvalds #include <linux/ipv6.h> 381da177e4SLinus Torvalds #include <linux/net.h> 391da177e4SLinus Torvalds #include <linux/inet.h> 40ebc3bbcfSChristian Borntraeger #include <linux/scatterlist.h> 415a0e3ad6STejun Heo #include <linux/slab.h> 421da177e4SLinus Torvalds #include <net/sock.h> 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds #include <linux/skbuff.h> 451da177e4SLinus Torvalds #include <linux/random.h> /* for get_random_bytes */ 461da177e4SLinus Torvalds #include <net/sctp/sctp.h> 471da177e4SLinus Torvalds #include <net/sctp/sm.h> 481da177e4SLinus Torvalds 49072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 50cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 51cea8768fSMarcelo Ricardo Leitner gfp_t gfp); 52072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 53cea8768fSMarcelo Ricardo Leitner __u8 flags, int paylen, gfp_t gfp); 54072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 55cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 56cea8768fSMarcelo Ricardo Leitner gfp_t gfp); 57f48ef4c7SXin Long static struct sctp_cookie_param *sctp_pack_cookie( 58f48ef4c7SXin Long const struct sctp_endpoint *ep, 591da177e4SLinus Torvalds const struct sctp_association *asoc, 601da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 611da177e4SLinus Torvalds int *cookie_len, 621da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len); 631da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 641da177e4SLinus Torvalds union sctp_params param, 651da177e4SLinus Torvalds const union sctp_addr *peer_addr, 66dd0fc66fSAl Viro gfp_t gfp); 678ee4be37SVlad Yasevich static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 688ee4be37SVlad Yasevich const void *data); 691da177e4SLinus Torvalds 70072017b4SVlad Yasevich /* Control chunk destructor */ 71072017b4SVlad Yasevich static void sctp_control_release_owner(struct sk_buff *skb) 72072017b4SVlad Yasevich { 731b1e0bc9SXin Long struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg; 741b1e0bc9SXin Long 75ec2e506cSXin Long if (chunk->shkey) { 76ec2e506cSXin Long struct sctp_shared_key *shkey = chunk->shkey; 77ec2e506cSXin Long struct sctp_association *asoc = chunk->asoc; 78ec2e506cSXin Long 79ec2e506cSXin Long /* refcnt == 2 and !list_empty mean after this release, it's 80ec2e506cSXin Long * not being used anywhere, and it's time to notify userland 81ec2e506cSXin Long * that this shkey can be freed if it's been deactivated. 82ec2e506cSXin Long */ 83ec2e506cSXin Long if (shkey->deactivated && !list_empty(&shkey->key_list) && 84ec2e506cSXin Long refcount_read(&shkey->refcnt) == 2) { 85ec2e506cSXin Long struct sctp_ulpevent *ev; 86ec2e506cSXin Long 87ec2e506cSXin Long ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id, 88ec2e506cSXin Long SCTP_AUTH_FREE_KEY, 89ec2e506cSXin Long GFP_KERNEL); 90ec2e506cSXin Long if (ev) 91ec2e506cSXin Long asoc->stream.si->enqueue_event(&asoc->ulpq, ev); 92ec2e506cSXin Long } 931b1e0bc9SXin Long sctp_auth_shkey_release(chunk->shkey); 94072017b4SVlad Yasevich } 95ec2e506cSXin Long } 96072017b4SVlad Yasevich 97072017b4SVlad Yasevich static void sctp_control_set_owner_w(struct sctp_chunk *chunk) 98072017b4SVlad Yasevich { 99072017b4SVlad Yasevich struct sctp_association *asoc = chunk->asoc; 100072017b4SVlad Yasevich struct sk_buff *skb = chunk->skb; 101072017b4SVlad Yasevich 102072017b4SVlad Yasevich /* TODO: properly account for control chunks. 103072017b4SVlad Yasevich * To do it right we'll need: 104072017b4SVlad Yasevich * 1) endpoint if association isn't known. 105072017b4SVlad Yasevich * 2) proper memory accounting. 106072017b4SVlad Yasevich * 107072017b4SVlad Yasevich * For now don't do anything for now. 108072017b4SVlad Yasevich */ 1091b1e0bc9SXin Long if (chunk->auth) { 1101b1e0bc9SXin Long chunk->shkey = asoc->shkey; 1111b1e0bc9SXin Long sctp_auth_shkey_hold(chunk->shkey); 1121b1e0bc9SXin Long } 113072017b4SVlad Yasevich skb->sk = asoc ? asoc->base.sk : NULL; 1141b1e0bc9SXin Long skb_shinfo(skb)->destructor_arg = chunk; 115072017b4SVlad Yasevich skb->destructor = sctp_control_release_owner; 116072017b4SVlad Yasevich } 117072017b4SVlad Yasevich 1181da177e4SLinus Torvalds /* What was the inbound interface for this chunk? */ 1191da177e4SLinus Torvalds int sctp_chunk_iif(const struct sctp_chunk *chunk) 1201da177e4SLinus Torvalds { 121e7487c86SMarcelo Ricardo Leitner struct sk_buff *skb = chunk->skb; 1221da177e4SLinus Torvalds 123e7487c86SMarcelo Ricardo Leitner return SCTP_INPUT_CB(skb)->af->skb_iif(skb); 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 1271da177e4SLinus Torvalds * 1281da177e4SLinus Torvalds * Note 2: The ECN capable field is reserved for future use of 1291da177e4SLinus Torvalds * Explicit Congestion Notification. 1301da177e4SLinus Torvalds */ 1311da177e4SLinus Torvalds static const struct sctp_paramhdr ecap_param = { 1321da177e4SLinus Torvalds SCTP_PARAM_ECN_CAPABLE, 13309640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1341da177e4SLinus Torvalds }; 1351da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1361da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 13709640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1381da177e4SLinus Torvalds }; 1391da177e4SLinus Torvalds 1408914f4baSMarcelo Ricardo Leitner /* A helper to initialize an op error inside a provided chunk, as most 1418914f4baSMarcelo Ricardo Leitner * cause codes will be embedded inside an abort chunk. 1421da177e4SLinus Torvalds */ 1436d3e8aa8SMarcelo Ricardo Leitner int sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, 14400f1c2dfSWei Yongjun size_t paylen) 1451da177e4SLinus Torvalds { 146d8238d9dSXin Long struct sctp_errhdr err; 1471da177e4SLinus Torvalds __u16 len; 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds /* Cause code constants are now defined in network order. */ 1501da177e4SLinus Torvalds err.cause = cause_code; 151d8238d9dSXin Long len = sizeof(err) + paylen; 1521da177e4SLinus Torvalds err.length = htons(len); 1536d3e8aa8SMarcelo Ricardo Leitner 1546d3e8aa8SMarcelo Ricardo Leitner if (skb_tailroom(chunk->skb) < len) 1556d3e8aa8SMarcelo Ricardo Leitner return -ENOSPC; 1566d3e8aa8SMarcelo Ricardo Leitner 157d8238d9dSXin Long chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(err), &err); 1586d3e8aa8SMarcelo Ricardo Leitner 1596d3e8aa8SMarcelo Ricardo Leitner return 0; 1601da177e4SLinus Torvalds } 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds /* 3.3.2 Initiation (INIT) (1) 1631da177e4SLinus Torvalds * 1641da177e4SLinus Torvalds * This chunk is used to initiate a SCTP association between two 1651da177e4SLinus Torvalds * endpoints. The format of the INIT chunk is shown below: 1661da177e4SLinus Torvalds * 1671da177e4SLinus Torvalds * 0 1 2 3 1681da177e4SLinus 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 1691da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1701da177e4SLinus Torvalds * | Type = 1 | Chunk Flags | Chunk Length | 1711da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1721da177e4SLinus Torvalds * | Initiate Tag | 1731da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1741da177e4SLinus Torvalds * | Advertised Receiver Window Credit (a_rwnd) | 1751da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1761da177e4SLinus Torvalds * | Number of Outbound Streams | Number of Inbound Streams | 1771da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1781da177e4SLinus Torvalds * | Initial TSN | 1791da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1801da177e4SLinus Torvalds * \ \ 1811da177e4SLinus Torvalds * / Optional/Variable-Length Parameters / 1821da177e4SLinus Torvalds * \ \ 1831da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1841da177e4SLinus Torvalds * 1851da177e4SLinus Torvalds * 1861da177e4SLinus Torvalds * The INIT chunk contains the following parameters. Unless otherwise 1871da177e4SLinus Torvalds * noted, each parameter MUST only be included once in the INIT chunk. 1881da177e4SLinus Torvalds * 1891da177e4SLinus Torvalds * Fixed Parameters Status 1901da177e4SLinus Torvalds * ---------------------------------------------- 1911da177e4SLinus Torvalds * Initiate Tag Mandatory 1921da177e4SLinus Torvalds * Advertised Receiver Window Credit Mandatory 1931da177e4SLinus Torvalds * Number of Outbound Streams Mandatory 1941da177e4SLinus Torvalds * Number of Inbound Streams Mandatory 1951da177e4SLinus Torvalds * Initial TSN Mandatory 1961da177e4SLinus Torvalds * 1971da177e4SLinus Torvalds * Variable Parameters Status Type Value 1981da177e4SLinus Torvalds * ------------------------------------------------------------- 1991da177e4SLinus Torvalds * IPv4 Address (Note 1) Optional 5 2001da177e4SLinus Torvalds * IPv6 Address (Note 1) Optional 6 2011da177e4SLinus Torvalds * Cookie Preservative Optional 9 2021da177e4SLinus Torvalds * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) 2031da177e4SLinus Torvalds * Host Name Address (Note 3) Optional 11 2041da177e4SLinus Torvalds * Supported Address Types (Note 4) Optional 12 2051da177e4SLinus Torvalds */ 2061da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, 2071da177e4SLinus Torvalds const struct sctp_bind_addr *bp, 208dd0fc66fSAl Viro gfp_t gfp, int vparam_len) 2091da177e4SLinus Torvalds { 210327c0dabSXin Long struct sctp_supported_ext_param ext_param; 211327c0dabSXin Long struct sctp_adaptation_ind_param aiparam; 212327c0dabSXin Long struct sctp_paramhdr *auth_chunks = NULL; 213327c0dabSXin Long struct sctp_paramhdr *auth_hmacs = NULL; 214327c0dabSXin Long struct sctp_supported_addrs_param sat; 215b14878ccSVlad Yasevich struct sctp_endpoint *ep = asoc->ep; 2161da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 2171da177e4SLinus Torvalds int num_types, addrs_len = 0; 218327c0dabSXin Long struct sctp_inithdr init; 219327c0dabSXin Long union sctp_params addrs; 2201da177e4SLinus Torvalds struct sctp_sock *sp; 22196b120b3SXin Long __u8 extensions[5]; 222327c0dabSXin Long size_t chunksize; 223327c0dabSXin Long __be16 types[2]; 224327c0dabSXin Long int num_ext = 0; 2251da177e4SLinus Torvalds 2261da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2271da177e4SLinus Torvalds * 2281da177e4SLinus Torvalds * Note 1: The INIT chunks can contain multiple addresses that 2291da177e4SLinus Torvalds * can be IPv4 and/or IPv6 in any combination. 2301da177e4SLinus Torvalds */ 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds /* Convert the provided bind address list to raw format. */ 2331da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds init.init_tag = htonl(asoc->c.my_vtag); 2361da177e4SLinus Torvalds init.a_rwnd = htonl(asoc->rwnd); 2371da177e4SLinus Torvalds init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2381da177e4SLinus Torvalds init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2391da177e4SLinus Torvalds init.initial_tsn = htonl(asoc->c.initial_tsn); 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds /* How many address types are needed? */ 2421da177e4SLinus Torvalds sp = sctp_sk(asoc->base.sk); 2431da177e4SLinus Torvalds num_types = sp->pf->supported_addrs(sp, types); 2441da177e4SLinus Torvalds 245a8170c35SWei Yongjun chunksize = sizeof(init) + addrs_len; 246e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types)); 2471b0b8114SXin Long 2481b0b8114SXin Long if (asoc->ep->ecn_enable) 2491da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 2508ee4be37SVlad Yasevich 2511c134753SXin Long if (asoc->ep->prsctp_enable) 252036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 253036b579bSVlad Yasevich 254131a47e3SVlad Yasevich /* ADDIP: Section 4.2.7: 255131a47e3SVlad Yasevich * An implementation supporting this extension [ADDIP] MUST list 256131a47e3SVlad Yasevich * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and 257131a47e3SVlad Yasevich * INIT-ACK parameters. 258131a47e3SVlad Yasevich */ 2594e27428fSXin Long if (asoc->ep->asconf_enable) { 260131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 261131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 262131a47e3SVlad Yasevich num_ext += 2; 263131a47e3SVlad Yasevich } 264131a47e3SVlad Yasevich 265a96701fbSXin Long if (asoc->ep->reconf_enable) { 266c28445c3SXin Long extensions[num_ext] = SCTP_CID_RECONF; 267c28445c3SXin Long num_ext += 1; 268c28445c3SXin Long } 269c28445c3SXin Long 2706fc791eeSmalc if (sp->adaptation_ind) 2711da177e4SLinus Torvalds chunksize += sizeof(aiparam); 2726fc791eeSmalc 273e55f4b8bSXin Long if (asoc->ep->intl_enable) { 27496b120b3SXin Long extensions[num_ext] = SCTP_CID_I_DATA; 27596b120b3SXin Long num_ext += 1; 27696b120b3SXin Long } 27796b120b3SXin Long 2781da177e4SLinus Torvalds chunksize += vparam_len; 2791da177e4SLinus Torvalds 280730fc3d0SVlad Yasevich /* Account for AUTH related parameters */ 281b14878ccSVlad Yasevich if (ep->auth_enable) { 282730fc3d0SVlad Yasevich /* Add random parameter length*/ 283730fc3d0SVlad Yasevich chunksize += sizeof(asoc->c.auth_random); 284730fc3d0SVlad Yasevich 285730fc3d0SVlad Yasevich /* Add HMACS parameter length if any were defined */ 2863c918704SXin Long auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs; 287730fc3d0SVlad Yasevich if (auth_hmacs->length) 288e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); 289730fc3d0SVlad Yasevich else 290730fc3d0SVlad Yasevich auth_hmacs = NULL; 291730fc3d0SVlad Yasevich 292730fc3d0SVlad Yasevich /* Add CHUNKS parameter length */ 2933c918704SXin Long auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks; 294730fc3d0SVlad Yasevich if (auth_chunks->length) 295e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); 296730fc3d0SVlad Yasevich else 2979baffaa6SVlad Yasevich auth_chunks = NULL; 298730fc3d0SVlad Yasevich 299730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 300730fc3d0SVlad Yasevich num_ext += 1; 301730fc3d0SVlad Yasevich } 302730fc3d0SVlad Yasevich 303131a47e3SVlad Yasevich /* If we have any extensions to report, account for that */ 304131a47e3SVlad Yasevich if (num_ext) 30515328d9fSXin Long chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext); 306131a47e3SVlad Yasevich 3071da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3081da177e4SLinus Torvalds * 3091da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 3101da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 3111da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 3121da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 3131da177e4SLinus Torvalds * other address types if the Host Name address parameter is 3141da177e4SLinus Torvalds * present in the received INIT chunk. 3151da177e4SLinus Torvalds * 3161da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 3171da177e4SLinus Torvalds */ 3181da177e4SLinus Torvalds 319cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp); 3201da177e4SLinus Torvalds if (!retval) 3211da177e4SLinus Torvalds goto nodata; 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds retval->subh.init_hdr = 3241da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 3251da177e4SLinus Torvalds retval->param_hdr.v = 3261da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3291da177e4SLinus Torvalds * 3301da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 3311da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 3321da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 3331da177e4SLinus Torvalds * support any address type. 3341da177e4SLinus Torvalds */ 3351da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 3361da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 3371da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 3381da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 3391da177e4SLinus Torvalds 3401b0b8114SXin Long if (asoc->ep->ecn_enable) 3411da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 342131a47e3SVlad Yasevich 3437aa1b54bSJoe Perches /* Add the supported extensions parameter. Be nice and add this 344131a47e3SVlad Yasevich * fist before addiding the parameters for the extensions themselves 345131a47e3SVlad Yasevich */ 346131a47e3SVlad Yasevich if (num_ext) { 347131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 34815328d9fSXin Long ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext); 34915328d9fSXin Long sctp_addto_chunk(retval, sizeof(ext_param), &ext_param); 3508ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 351131a47e3SVlad Yasevich } 352131a47e3SVlad Yasevich 3531c134753SXin Long if (asoc->ep->prsctp_enable) 3541da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 355131a47e3SVlad Yasevich 3566fc791eeSmalc if (sp->adaptation_ind) { 3570f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 3581da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3590f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sp->adaptation_ind); 3601da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 3616fc791eeSmalc } 362131a47e3SVlad Yasevich 363730fc3d0SVlad Yasevich /* Add SCTP-AUTH chunks to the parameter list */ 364b14878ccSVlad Yasevich if (ep->auth_enable) { 365730fc3d0SVlad Yasevich sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), 366730fc3d0SVlad Yasevich asoc->c.auth_random); 367730fc3d0SVlad Yasevich if (auth_hmacs) 368730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 369730fc3d0SVlad Yasevich auth_hmacs); 370730fc3d0SVlad Yasevich if (auth_chunks) 371730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 372730fc3d0SVlad Yasevich auth_chunks); 373730fc3d0SVlad Yasevich } 3741da177e4SLinus Torvalds nodata: 3751da177e4SLinus Torvalds kfree(addrs.v); 3761da177e4SLinus Torvalds return retval; 3771da177e4SLinus Torvalds } 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 3801da177e4SLinus Torvalds const struct sctp_chunk *chunk, 381dd0fc66fSAl Viro gfp_t gfp, int unkparam_len) 3821da177e4SLinus Torvalds { 383327c0dabSXin Long struct sctp_supported_ext_param ext_param; 384327c0dabSXin Long struct sctp_adaptation_ind_param aiparam; 385327c0dabSXin Long struct sctp_paramhdr *auth_chunks = NULL; 386327c0dabSXin Long struct sctp_paramhdr *auth_random = NULL; 387327c0dabSXin Long struct sctp_paramhdr *auth_hmacs = NULL; 388327c0dabSXin Long struct sctp_chunk *retval = NULL; 389327c0dabSXin Long struct sctp_cookie_param *cookie; 3904ae70c08SXin Long struct sctp_inithdr initack; 3911da177e4SLinus Torvalds union sctp_params addrs; 3926fc791eeSmalc struct sctp_sock *sp; 39396b120b3SXin Long __u8 extensions[5]; 394327c0dabSXin Long size_t chunksize; 395327c0dabSXin Long int num_ext = 0; 396327c0dabSXin Long int cookie_len; 397327c0dabSXin Long int addrs_len; 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 4001da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 4031da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 4041da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 4051da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 4061da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 4091da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 4101da177e4SLinus Torvalds */ 4111da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 4121da177e4SLinus Torvalds addrs.v, addrs_len); 4131da177e4SLinus Torvalds if (!cookie) 4141da177e4SLinus Torvalds goto nomem_cookie; 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 4171da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 4181da177e4SLinus Torvalds */ 4196fc791eeSmalc sp = sctp_sk(asoc->base.sk); 4201da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 4231da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4241da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 4251da177e4SLinus Torvalds 4265ffad5acSWei Yongjun if (asoc->peer.prsctp_capable) 427036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 428036b579bSVlad Yasevich 4295ffad5acSWei Yongjun if (asoc->peer.asconf_capable) { 430131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 431131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 432131a47e3SVlad Yasevich num_ext += 2; 433131a47e3SVlad Yasevich } 434131a47e3SVlad Yasevich 435c28445c3SXin Long if (asoc->peer.reconf_capable) { 436c28445c3SXin Long extensions[num_ext] = SCTP_CID_RECONF; 437c28445c3SXin Long num_ext += 1; 438c28445c3SXin Long } 439c28445c3SXin Long 4406fc791eeSmalc if (sp->adaptation_ind) 4411da177e4SLinus Torvalds chunksize += sizeof(aiparam); 4421da177e4SLinus Torvalds 443da1f6d4dSXin Long if (asoc->peer.intl_capable) { 44496b120b3SXin Long extensions[num_ext] = SCTP_CID_I_DATA; 44596b120b3SXin Long num_ext += 1; 44696b120b3SXin Long } 44796b120b3SXin Long 448730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 4493c918704SXin Long auth_random = (struct sctp_paramhdr *)asoc->c.auth_random; 450730fc3d0SVlad Yasevich chunksize += ntohs(auth_random->length); 451730fc3d0SVlad Yasevich 4523c918704SXin Long auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs; 453730fc3d0SVlad Yasevich if (auth_hmacs->length) 454e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); 455730fc3d0SVlad Yasevich else 456730fc3d0SVlad Yasevich auth_hmacs = NULL; 457730fc3d0SVlad Yasevich 4583c918704SXin Long auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks; 459730fc3d0SVlad Yasevich if (auth_chunks->length) 460e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); 461730fc3d0SVlad Yasevich else 462730fc3d0SVlad Yasevich auth_chunks = NULL; 463730fc3d0SVlad Yasevich 464730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 465730fc3d0SVlad Yasevich num_ext += 1; 466730fc3d0SVlad Yasevich } 467730fc3d0SVlad Yasevich 4688ee4be37SVlad Yasevich if (num_ext) 46915328d9fSXin Long chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext); 4708ee4be37SVlad Yasevich 4711da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 472cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp); 4731da177e4SLinus Torvalds if (!retval) 4741da177e4SLinus Torvalds goto nomem_chunk; 4751da177e4SLinus Torvalds 476b99a4d53SDan Carpenter /* RFC 2960 6.4 Multi-homed SCTP Endpoints 477b99a4d53SDan Carpenter * 478b99a4d53SDan Carpenter * An endpoint SHOULD transmit reply chunks (e.g., SACK, 479b99a4d53SDan Carpenter * HEARTBEAT ACK, * etc.) to the same destination transport 480b99a4d53SDan Carpenter * address from which it received the DATA or control chunk 481b99a4d53SDan Carpenter * to which it is replying. 482b99a4d53SDan Carpenter * 483b99a4d53SDan Carpenter * [INIT ACK back to where the INIT came from.] 4841da177e4SLinus Torvalds */ 4854ff40b86SXin Long if (chunk->transport) 4864ff40b86SXin Long retval->transport = 4874ff40b86SXin Long sctp_assoc_lookup_paddr(asoc, 4884ff40b86SXin Long &chunk->transport->ipaddr); 489b99a4d53SDan Carpenter 4901da177e4SLinus Torvalds retval->subh.init_hdr = 4911da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 4921da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 4931da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 4941da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4951da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 496131a47e3SVlad Yasevich if (num_ext) { 497131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 49815328d9fSXin Long ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext); 49915328d9fSXin Long sctp_addto_chunk(retval, sizeof(ext_param), &ext_param); 5008ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 501131a47e3SVlad Yasevich } 5021da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 5031da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 5041da177e4SLinus Torvalds 5056fc791eeSmalc if (sp->adaptation_ind) { 5060f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 5071da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 5086fc791eeSmalc aiparam.adaptation_ind = htonl(sp->adaptation_ind); 5091da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 5106fc791eeSmalc } 5111da177e4SLinus Torvalds 512730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 513730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_random->length), 514730fc3d0SVlad Yasevich auth_random); 515730fc3d0SVlad Yasevich if (auth_hmacs) 516730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 517730fc3d0SVlad Yasevich auth_hmacs); 518730fc3d0SVlad Yasevich if (auth_chunks) 519730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 520730fc3d0SVlad Yasevich auth_chunks); 521730fc3d0SVlad Yasevich } 522730fc3d0SVlad Yasevich 5231da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 5241da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds nomem_chunk: 5271da177e4SLinus Torvalds kfree(cookie); 5281da177e4SLinus Torvalds nomem_cookie: 5291da177e4SLinus Torvalds kfree(addrs.v); 5301da177e4SLinus Torvalds return retval; 5311da177e4SLinus Torvalds } 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 5341da177e4SLinus Torvalds * 5351da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 5361da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 5371da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 5381da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 5391da177e4SLinus Torvalds * chunks in the same packet. 5401da177e4SLinus Torvalds * 5411da177e4SLinus Torvalds * 0 1 2 3 5421da177e4SLinus 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 5431da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5441da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 5451da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5461da177e4SLinus Torvalds * / Cookie / 5471da177e4SLinus Torvalds * \ \ 5481da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5491da177e4SLinus Torvalds * 5501da177e4SLinus Torvalds * Chunk Flags: 8 bit 5511da177e4SLinus Torvalds * 5521da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5531da177e4SLinus Torvalds * 5541da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 5551da177e4SLinus Torvalds * 5561da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 5571da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 5581da177e4SLinus Torvalds * 5591da177e4SLinus Torvalds * Cookie: variable size 5601da177e4SLinus Torvalds * 5611da177e4SLinus Torvalds * This field must contain the exact cookie received in the 5621da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 5631da177e4SLinus Torvalds * 5641da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 5651da177e4SLinus Torvalds * to insure interoperability. 5661da177e4SLinus Torvalds */ 5671da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 5681da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5691da177e4SLinus Torvalds { 5701da177e4SLinus Torvalds struct sctp_chunk *retval; 5711da177e4SLinus Torvalds int cookie_len; 572327c0dabSXin Long void *cookie; 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds cookie = asoc->peer.cookie; 5751da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 578cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, 579cea8768fSMarcelo Ricardo Leitner cookie_len, GFP_ATOMIC); 5801da177e4SLinus Torvalds if (!retval) 5811da177e4SLinus Torvalds goto nodata; 5821da177e4SLinus Torvalds retval->subh.cookie_hdr = 5831da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5861da177e4SLinus Torvalds * 5871da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5881da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5891da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5901da177e4SLinus Torvalds * to which it is replying. 5911da177e4SLinus Torvalds * 5921da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 5931da177e4SLinus Torvalds */ 5941da177e4SLinus Torvalds if (chunk) 5951da177e4SLinus Torvalds retval->transport = chunk->transport; 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds nodata: 5981da177e4SLinus Torvalds return retval; 5991da177e4SLinus Torvalds } 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 6021da177e4SLinus Torvalds * 6031da177e4SLinus Torvalds * This chunk is used only during the initialization of an 6041da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 6051da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 6061da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 6071da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 6081da177e4SLinus Torvalds * 6091da177e4SLinus Torvalds * 0 1 2 3 6101da177e4SLinus 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 6111da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6121da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 6131da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6141da177e4SLinus Torvalds * 6151da177e4SLinus Torvalds * Chunk Flags: 8 bits 6161da177e4SLinus Torvalds * 6171da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 6181da177e4SLinus Torvalds */ 6191da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 6201da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6211da177e4SLinus Torvalds { 6221da177e4SLinus Torvalds struct sctp_chunk *retval; 6231da177e4SLinus Torvalds 624cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC); 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6271da177e4SLinus Torvalds * 6281da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6291da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6301da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6311da177e4SLinus Torvalds * to which it is replying. 6321da177e4SLinus Torvalds * 6331da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 6341da177e4SLinus Torvalds */ 6354ff40b86SXin Long if (retval && chunk && chunk->transport) 6364ff40b86SXin Long retval->transport = 6374ff40b86SXin Long sctp_assoc_lookup_paddr(asoc, 6384ff40b86SXin Long &chunk->transport->ipaddr); 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds return retval; 6411da177e4SLinus Torvalds } 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds /* 6441da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 6451da177e4SLinus Torvalds * CWR: 6461da177e4SLinus Torvalds * 6471da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 6481da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 6491da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 6501da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 6511da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 6521da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 6531da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 6541da177e4SLinus Torvalds * CE bit. 6551da177e4SLinus Torvalds * 6561da177e4SLinus Torvalds * 0 1 2 3 6571da177e4SLinus 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 6581da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6591da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 6601da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6611da177e4SLinus Torvalds * | Lowest TSN Number | 6621da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6631da177e4SLinus Torvalds * 6641da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 6651da177e4SLinus Torvalds */ 6661da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 6671da177e4SLinus Torvalds const __u32 lowest_tsn, 6681da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6691da177e4SLinus Torvalds { 6701da177e4SLinus Torvalds struct sctp_chunk *retval; 67165f77105SXin Long struct sctp_cwrhdr cwr; 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 674072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, 67565f77105SXin Long sizeof(cwr), GFP_ATOMIC); 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds if (!retval) 6781da177e4SLinus Torvalds goto nodata; 6791da177e4SLinus Torvalds 6801da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 6811da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6841da177e4SLinus Torvalds * 6851da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6861da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6871da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6881da177e4SLinus Torvalds * to which it is replying. 6891da177e4SLinus Torvalds * 6901da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 6911da177e4SLinus Torvalds * came from.] 6921da177e4SLinus Torvalds */ 6931da177e4SLinus Torvalds if (chunk) 6941da177e4SLinus Torvalds retval->transport = chunk->transport; 6951da177e4SLinus Torvalds 6961da177e4SLinus Torvalds nodata: 6971da177e4SLinus Torvalds return retval; 6981da177e4SLinus Torvalds } 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 7011da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 7021da177e4SLinus Torvalds const __u32 lowest_tsn) 7031da177e4SLinus Torvalds { 7041da177e4SLinus Torvalds struct sctp_chunk *retval; 7051fb6d83bSXin Long struct sctp_ecnehdr ecne; 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 708072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, 7091fb6d83bSXin Long sizeof(ecne), GFP_ATOMIC); 7101da177e4SLinus Torvalds if (!retval) 7111da177e4SLinus Torvalds goto nodata; 7121da177e4SLinus Torvalds retval->subh.ecne_hdr = 7131da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds nodata: 7161da177e4SLinus Torvalds return retval; 7171da177e4SLinus Torvalds } 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 7201da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 7211da177e4SLinus Torvalds */ 7220c3f6f65SXin Long struct sctp_chunk *sctp_make_datafrag_empty(const struct sctp_association *asoc, 7231da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 7240c3f6f65SXin Long int len, __u8 flags, gfp_t gfp) 7251da177e4SLinus Torvalds { 7261da177e4SLinus Torvalds struct sctp_chunk *retval; 7271da177e4SLinus Torvalds struct sctp_datahdr dp; 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 7301da177e4SLinus Torvalds * creating the chunk. 7311da177e4SLinus Torvalds */ 7320c3f6f65SXin Long memset(&dp, 0, sizeof(dp)); 7331da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 7340c3f6f65SXin Long dp.stream = htons(sinfo->sinfo_stream); 7351da177e4SLinus Torvalds 7361da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 7370c3f6f65SXin Long if (sinfo->sinfo_flags & SCTP_UNORDERED) 7381da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 7391da177e4SLinus Torvalds 7400c3f6f65SXin Long retval = sctp_make_data(asoc, flags, sizeof(dp) + len, gfp); 7411da177e4SLinus Torvalds if (!retval) 7420c3f6f65SXin Long return NULL; 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 7451da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds return retval; 7481da177e4SLinus Torvalds } 7491da177e4SLinus Torvalds 7501da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 7511da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 7521da177e4SLinus Torvalds * including duplicates and gaps. 7531da177e4SLinus Torvalds */ 75447b3ba51SMarcelo Ricardo Leitner struct sctp_chunk *sctp_make_sack(struct sctp_association *asoc) 7551da177e4SLinus Torvalds { 756327c0dabSXin Long struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 757327c0dabSXin Long struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; 758327c0dabSXin Long __u16 num_gabs, num_dup_tsns; 759327c0dabSXin Long struct sctp_transport *trans; 7601da177e4SLinus Torvalds struct sctp_chunk *retval; 7611da177e4SLinus Torvalds struct sctp_sackhdr sack; 7621da177e4SLinus Torvalds __u32 ctsn; 763327c0dabSXin Long int len; 7641da177e4SLinus Torvalds 76502015180SVlad Yasevich memset(gabs, 0, sizeof(gabs)); 7661da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 767bb33381dSDaniel Borkmann 768bb33381dSDaniel Borkmann pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn); 7691da177e4SLinus Torvalds 7701da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 77102015180SVlad Yasevich num_gabs = sctp_tsnmap_num_gabs(map, gabs); 7721da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 7731da177e4SLinus Torvalds 7741da177e4SLinus Torvalds /* Initialize the SACK header. */ 7751da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 7761da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 7771da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 7781da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 7791da177e4SLinus Torvalds 7801da177e4SLinus Torvalds len = sizeof(sack) 7811da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 7821da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 7831da177e4SLinus Torvalds 7841da177e4SLinus Torvalds /* Create the chunk. */ 785cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC); 7861da177e4SLinus Torvalds if (!retval) 7871da177e4SLinus Torvalds goto nodata; 7881da177e4SLinus Torvalds 7891da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7901da177e4SLinus Torvalds * 7911da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 7921da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 7931da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 7941da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 7951da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 7961da177e4SLinus Torvalds * reply chunk. 7971da177e4SLinus Torvalds * 7981da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 7991da177e4SLinus Torvalds * in packets from different source addresses in a single 8001da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 8011da177e4SLinus Torvalds * destination transport addresses from which the DATA or 8021da177e4SLinus Torvalds * control chunks being acknowledged were received. 8031da177e4SLinus Torvalds * 8041da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 8051da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 8061da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 8071da177e4SLinus Torvalds * duplicates. --piggy] 8081da177e4SLinus Torvalds * 8091da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 8101da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 8111da177e4SLinus Torvalds * destination address and not use the source address of the 8121da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 8131da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 8141da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 8151da177e4SLinus Torvalds * for the SACK is broken. 8161da177e4SLinus Torvalds * 8171da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 8181da177e4SLinus Torvalds */ 8191da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 8201da177e4SLinus Torvalds 8211da177e4SLinus Torvalds retval->subh.sack_hdr = 8221da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 8231da177e4SLinus Torvalds 8241da177e4SLinus Torvalds /* Add the gap ack block information. */ 8251da177e4SLinus Torvalds if (num_gabs) 8261da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 82702015180SVlad Yasevich gabs); 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 830196d6759SMichele Baldessari if (num_dup_tsns) { 83147b3ba51SMarcelo Ricardo Leitner asoc->stats.idupchunks += num_dup_tsns; 8321da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 8331da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 834196d6759SMichele Baldessari } 8354244854dSNeil Horman /* Once we have a sack generated, check to see what our sack 8364244854dSNeil Horman * generation is, if its 0, reset the transports to 0, and reset 8374244854dSNeil Horman * the association generation to 1 8384244854dSNeil Horman * 8394244854dSNeil Horman * The idea is that zero is never used as a valid generation for the 8404244854dSNeil Horman * association so no transport will match after a wrap event like this, 8414244854dSNeil Horman * Until the next sack 8424244854dSNeil Horman */ 84347b3ba51SMarcelo Ricardo Leitner if (++asoc->peer.sack_generation == 0) { 8444244854dSNeil Horman list_for_each_entry(trans, &asoc->peer.transport_addr_list, 8454244854dSNeil Horman transports) 8464244854dSNeil Horman trans->sack_generation = 0; 84747b3ba51SMarcelo Ricardo Leitner asoc->peer.sack_generation = 1; 8484244854dSNeil Horman } 8491da177e4SLinus Torvalds nodata: 8501da177e4SLinus Torvalds return retval; 8511da177e4SLinus Torvalds } 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 8541da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 8551da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8561da177e4SLinus Torvalds { 857e61e4055SXin Long struct sctp_shutdownhdr shut; 8581da177e4SLinus Torvalds struct sctp_chunk *retval; 8591da177e4SLinus Torvalds __u32 ctsn; 8601da177e4SLinus Torvalds 86112dfd78eSJere Leppänen if (chunk && chunk->asoc) 86212dfd78eSJere Leppänen ctsn = sctp_tsnmap_get_ctsn(&chunk->asoc->peer.tsn_map); 86312dfd78eSJere Leppänen else 8641da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 86512dfd78eSJere Leppänen 8661da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 8671da177e4SLinus Torvalds 868072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, 869e61e4055SXin Long sizeof(shut), GFP_ATOMIC); 8701da177e4SLinus Torvalds if (!retval) 8711da177e4SLinus Torvalds goto nodata; 8721da177e4SLinus Torvalds 8731da177e4SLinus Torvalds retval->subh.shutdown_hdr = 8741da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds if (chunk) 8771da177e4SLinus Torvalds retval->transport = chunk->transport; 8781da177e4SLinus Torvalds nodata: 8791da177e4SLinus Torvalds return retval; 8801da177e4SLinus Torvalds } 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8831da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8841da177e4SLinus Torvalds { 8851da177e4SLinus Torvalds struct sctp_chunk *retval; 8861da177e4SLinus Torvalds 887cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0, 888cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8911da177e4SLinus Torvalds * 8921da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8931da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8941da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8951da177e4SLinus Torvalds * to which it is replying. 8961da177e4SLinus Torvalds * 8971da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 8981da177e4SLinus Torvalds */ 8991da177e4SLinus Torvalds if (retval && chunk) 9001da177e4SLinus Torvalds retval->transport = chunk->transport; 9011da177e4SLinus Torvalds 9021da177e4SLinus Torvalds return retval; 9031da177e4SLinus Torvalds } 9041da177e4SLinus Torvalds 9051da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 9061da177e4SLinus Torvalds const struct sctp_association *asoc, 9071da177e4SLinus Torvalds const struct sctp_chunk *chunk) 9081da177e4SLinus Torvalds { 9091da177e4SLinus Torvalds struct sctp_chunk *retval; 9101da177e4SLinus Torvalds __u8 flags = 0; 9111da177e4SLinus Torvalds 912047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 913047a2428SJerome Forissier * reflected) 914047a2428SJerome Forissier */ 9151da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 9161da177e4SLinus Torvalds 917cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 918cea8768fSMarcelo Ricardo Leitner 0, GFP_ATOMIC); 9191da177e4SLinus Torvalds 9201da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9211da177e4SLinus Torvalds * 9221da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9231da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9241da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9251da177e4SLinus Torvalds * to which it is replying. 9261da177e4SLinus Torvalds * 9271da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 9281da177e4SLinus Torvalds * came from.] 9291da177e4SLinus Torvalds */ 9301da177e4SLinus Torvalds if (retval && chunk) 9311da177e4SLinus Torvalds retval->transport = chunk->transport; 9321da177e4SLinus Torvalds 9331da177e4SLinus Torvalds return retval; 9341da177e4SLinus Torvalds } 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 937047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 9381da177e4SLinus Torvalds */ 9391da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 9401da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9411da177e4SLinus Torvalds const size_t hint) 9421da177e4SLinus Torvalds { 9431da177e4SLinus Torvalds struct sctp_chunk *retval; 9441da177e4SLinus Torvalds __u8 flags = 0; 9451da177e4SLinus Torvalds 946047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 947047a2428SJerome Forissier * an INIT (vtag will be reflected). 948047a2428SJerome Forissier */ 949047a2428SJerome Forissier if (!asoc) { 950047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 951047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 952047a2428SJerome Forissier flags = 0; 953047a2428SJerome Forissier else 954047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 955047a2428SJerome Forissier } 9561da177e4SLinus Torvalds 957cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint, 958cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 9591da177e4SLinus Torvalds 9601da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9611da177e4SLinus Torvalds * 9621da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9631da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9641da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9651da177e4SLinus Torvalds * to which it is replying. 9661da177e4SLinus Torvalds * 9671da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9681da177e4SLinus Torvalds */ 9691da177e4SLinus Torvalds if (retval && chunk) 9701da177e4SLinus Torvalds retval->transport = chunk->transport; 9711da177e4SLinus Torvalds 9721da177e4SLinus Torvalds return retval; 9731da177e4SLinus Torvalds } 9741da177e4SLinus Torvalds 9751da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 9761da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 9771da177e4SLinus Torvalds const struct sctp_association *asoc, 978327c0dabSXin Long const struct sctp_chunk *chunk, 979327c0dabSXin Long __u32 tsn) 9801da177e4SLinus Torvalds { 9811da177e4SLinus Torvalds struct sctp_chunk *retval; 9829f81bcd9SAl Viro __be32 payload; 9831da177e4SLinus Torvalds 984d8238d9dSXin Long retval = sctp_make_abort(asoc, chunk, 985d8238d9dSXin Long sizeof(struct sctp_errhdr) + sizeof(tsn)); 9861da177e4SLinus Torvalds 9871da177e4SLinus Torvalds if (!retval) 9881da177e4SLinus Torvalds goto no_mem; 9891da177e4SLinus Torvalds 9901da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 9911da177e4SLinus Torvalds payload = htonl(tsn); 99200f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 99300f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 9941da177e4SLinus Torvalds 9951da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9961da177e4SLinus Torvalds * 9971da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9981da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9991da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 10001da177e4SLinus Torvalds * to which it is replying. 10011da177e4SLinus Torvalds * 10021da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 10031da177e4SLinus Torvalds */ 10041da177e4SLinus Torvalds if (chunk) 10051da177e4SLinus Torvalds retval->transport = chunk->transport; 10061da177e4SLinus Torvalds 10071da177e4SLinus Torvalds no_mem: 10081da177e4SLinus Torvalds return retval; 10091da177e4SLinus Torvalds } 10101da177e4SLinus Torvalds 10111da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 10121da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 10136ce8e9ceSAl Viro struct msghdr *msg, 1014c164a9baSSridhar Samudrala size_t paylen) 10151da177e4SLinus Torvalds { 10161da177e4SLinus Torvalds struct sctp_chunk *retval; 1017c164a9baSSridhar Samudrala void *payload = NULL; 1018c164a9baSSridhar Samudrala int err; 10191da177e4SLinus Torvalds 1020d8238d9dSXin Long retval = sctp_make_abort(asoc, NULL, 1021d8238d9dSXin Long sizeof(struct sctp_errhdr) + paylen); 10221da177e4SLinus Torvalds if (!retval) 10231da177e4SLinus Torvalds goto err_chunk; 10241da177e4SLinus Torvalds 10251da177e4SLinus Torvalds if (paylen) { 10261da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 1027c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 10281da177e4SLinus Torvalds if (!payload) 10291da177e4SLinus Torvalds goto err_payload; 10301da177e4SLinus Torvalds 10316ce8e9ceSAl Viro err = memcpy_from_msg(payload, msg, paylen); 1032c164a9baSSridhar Samudrala if (err < 0) 10331da177e4SLinus Torvalds goto err_copy; 10341da177e4SLinus Torvalds } 10351da177e4SLinus Torvalds 103600f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 103700f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10381da177e4SLinus Torvalds 10391da177e4SLinus Torvalds if (paylen) 10401da177e4SLinus Torvalds kfree(payload); 10411da177e4SLinus Torvalds 10421da177e4SLinus Torvalds return retval; 10431da177e4SLinus Torvalds 10441da177e4SLinus Torvalds err_copy: 10451da177e4SLinus Torvalds kfree(payload); 10461da177e4SLinus Torvalds err_payload: 10471da177e4SLinus Torvalds sctp_chunk_free(retval); 10481da177e4SLinus Torvalds retval = NULL; 10491da177e4SLinus Torvalds err_chunk: 10501da177e4SLinus Torvalds return retval; 10511da177e4SLinus Torvalds } 10521da177e4SLinus Torvalds 10535c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 10545c94bf86SAdrian Bunk * enough. 10555c94bf86SAdrian Bunk */ 10565c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 10575c94bf86SAdrian Bunk const void *data) 10585c94bf86SAdrian Bunk { 10595c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 1060327c0dabSXin Long void *target; 10615c94bf86SAdrian Bunk 10625c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 10635c94bf86SAdrian Bunk 10646383cfb3SVlad Yasevich if (data) 10655c94bf86SAdrian Bunk memcpy(target, data, len); 10666383cfb3SVlad Yasevich else 10676383cfb3SVlad Yasevich memset(target, 0, len); 10685c94bf86SAdrian Bunk 10695c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 10705c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 10715c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 10725c94bf86SAdrian Bunk 10735c94bf86SAdrian Bunk return target; 10745c94bf86SAdrian Bunk } 10755c94bf86SAdrian Bunk 10761da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 10771da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 10781da177e4SLinus Torvalds const struct sctp_association *asoc, 10791da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10801da177e4SLinus Torvalds const __u8 *payload, 10811da177e4SLinus Torvalds const size_t paylen) 10821da177e4SLinus Torvalds { 10831da177e4SLinus Torvalds struct sctp_chunk *retval; 10841da177e4SLinus Torvalds struct sctp_paramhdr phdr; 10851da177e4SLinus Torvalds 1086d8238d9dSXin Long retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) + 1087d8238d9dSXin Long paylen + sizeof(phdr)); 10881da177e4SLinus Torvalds if (!retval) 10891da177e4SLinus Torvalds goto end; 10901da177e4SLinus Torvalds 10913c918704SXin Long sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen + 10923c918704SXin Long sizeof(phdr)); 10931da177e4SLinus Torvalds 10941da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 10951da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 109600f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10973c918704SXin Long sctp_addto_param(retval, sizeof(phdr), &phdr); 10981da177e4SLinus Torvalds 10991da177e4SLinus Torvalds end: 11001da177e4SLinus Torvalds return retval; 11011da177e4SLinus Torvalds } 11021da177e4SLinus Torvalds 1103ba016670SWei Yongjun struct sctp_chunk *sctp_make_violation_paramlen( 1104ba016670SWei Yongjun const struct sctp_association *asoc, 1105ba016670SWei Yongjun const struct sctp_chunk *chunk, 1106ba016670SWei Yongjun struct sctp_paramhdr *param) 1107ba016670SWei Yongjun { 1108ba016670SWei Yongjun static const char error[] = "The following parameter had invalid length:"; 1109d8238d9dSXin Long size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) + 11103c918704SXin Long sizeof(*param); 1111327c0dabSXin Long struct sctp_chunk *retval; 1112ba016670SWei Yongjun 1113ba016670SWei Yongjun retval = sctp_make_abort(asoc, chunk, payload_len); 1114ba016670SWei Yongjun if (!retval) 1115ba016670SWei Yongjun goto nodata; 1116ba016670SWei Yongjun 1117ba016670SWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, 11183c918704SXin Long sizeof(error) + sizeof(*param)); 1119ba016670SWei Yongjun sctp_addto_chunk(retval, sizeof(error), error); 11203c918704SXin Long sctp_addto_param(retval, sizeof(*param), param); 1121ba016670SWei Yongjun 1122ba016670SWei Yongjun nodata: 1123ba016670SWei Yongjun return retval; 1124ba016670SWei Yongjun } 1125ba016670SWei Yongjun 1126de4594a5SNeil Horman struct sctp_chunk *sctp_make_violation_max_retrans( 1127de4594a5SNeil Horman const struct sctp_association *asoc, 1128de4594a5SNeil Horman const struct sctp_chunk *chunk) 1129de4594a5SNeil Horman { 113039a2d5cbSColin Ian King static const char error[] = "Association exceeded its max_retrans count"; 1131d8238d9dSXin Long size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr); 1132327c0dabSXin Long struct sctp_chunk *retval; 1133de4594a5SNeil Horman 1134de4594a5SNeil Horman retval = sctp_make_abort(asoc, chunk, payload_len); 1135de4594a5SNeil Horman if (!retval) 1136de4594a5SNeil Horman goto nodata; 1137de4594a5SNeil Horman 1138de4594a5SNeil Horman sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); 1139de4594a5SNeil Horman sctp_addto_chunk(retval, sizeof(error), error); 1140de4594a5SNeil Horman 1141de4594a5SNeil Horman nodata: 1142de4594a5SNeil Horman return retval; 1143de4594a5SNeil Horman } 1144de4594a5SNeil Horman 11451da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 11461da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 114792c73af5SWei Yongjun const struct sctp_transport *transport) 11481da177e4SLinus Torvalds { 1149edf903f8SXin Long struct sctp_sender_hb_info hbinfo; 115092c73af5SWei Yongjun struct sctp_chunk *retval; 115192c73af5SWei Yongjun 1152cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, 1153cea8768fSMarcelo Ricardo Leitner sizeof(hbinfo), GFP_ATOMIC); 11541da177e4SLinus Torvalds 11551da177e4SLinus Torvalds if (!retval) 11561da177e4SLinus Torvalds goto nodata; 11571da177e4SLinus Torvalds 115892c73af5SWei Yongjun hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; 1159edf903f8SXin Long hbinfo.param_hdr.length = htons(sizeof(hbinfo)); 116092c73af5SWei Yongjun hbinfo.daddr = transport->ipaddr; 116192c73af5SWei Yongjun hbinfo.sent_at = jiffies; 116292c73af5SWei Yongjun hbinfo.hb_nonce = transport->hb_nonce; 116392c73af5SWei Yongjun 11641da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 11651da177e4SLinus Torvalds * what transport it belongs to. 11661da177e4SLinus Torvalds */ 11671da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 116892c73af5SWei Yongjun retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), 116992c73af5SWei Yongjun &hbinfo); 11701da177e4SLinus Torvalds 11711da177e4SLinus Torvalds nodata: 11721da177e4SLinus Torvalds return retval; 11731da177e4SLinus Torvalds } 11741da177e4SLinus Torvalds 11751da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 11761da177e4SLinus Torvalds const struct sctp_chunk *chunk, 1177327c0dabSXin Long const void *payload, 1178327c0dabSXin Long const size_t paylen) 11791da177e4SLinus Torvalds { 11801da177e4SLinus Torvalds struct sctp_chunk *retval; 11811da177e4SLinus Torvalds 1182cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen, 1183cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 11841da177e4SLinus Torvalds if (!retval) 11851da177e4SLinus Torvalds goto nodata; 11861da177e4SLinus Torvalds 11871da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 11881da177e4SLinus Torvalds 11891da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11901da177e4SLinus Torvalds * 11911da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11921da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 11931da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 11941da177e4SLinus Torvalds * to which it is replying. 11951da177e4SLinus Torvalds * 11961da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 11971da177e4SLinus Torvalds */ 11981da177e4SLinus Torvalds if (chunk) 11991da177e4SLinus Torvalds retval->transport = chunk->transport; 12001da177e4SLinus Torvalds 12011da177e4SLinus Torvalds nodata: 12021da177e4SLinus Torvalds return retval; 12031da177e4SLinus Torvalds } 12041da177e4SLinus Torvalds 12051da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 12061da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 12071da177e4SLinus Torvalds */ 12081da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 12091da177e4SLinus Torvalds const struct sctp_association *asoc, 12101da177e4SLinus Torvalds const struct sctp_chunk *chunk, 12111da177e4SLinus Torvalds size_t size) 12121da177e4SLinus Torvalds { 12131da177e4SLinus Torvalds struct sctp_chunk *retval; 12141da177e4SLinus Torvalds 1215072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, 1216d8238d9dSXin Long sizeof(struct sctp_errhdr) + size, 1217d8238d9dSXin Long GFP_ATOMIC); 12181da177e4SLinus Torvalds if (!retval) 12191da177e4SLinus Torvalds goto nodata; 12201da177e4SLinus Torvalds 12211da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 12221da177e4SLinus Torvalds * 12231da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 12241da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 12251da177e4SLinus Torvalds * address from which it received the DATA or control chunk 12261da177e4SLinus Torvalds * to which it is replying. 12271da177e4SLinus Torvalds * 12281da177e4SLinus Torvalds */ 12291da177e4SLinus Torvalds if (chunk) 12301da177e4SLinus Torvalds retval->transport = chunk->transport; 12311da177e4SLinus Torvalds 12321da177e4SLinus Torvalds nodata: 12331da177e4SLinus Torvalds return retval; 12341da177e4SLinus Torvalds } 12351da177e4SLinus Torvalds 12368914f4baSMarcelo Ricardo Leitner /* Create an Operation Error chunk of a fixed size, specifically, 12378914f4baSMarcelo Ricardo Leitner * min(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) - overheads. 12388914f4baSMarcelo Ricardo Leitner * This is a helper function to allocate an error chunk for for those 12398914f4baSMarcelo Ricardo Leitner * invalid parameter codes in which we may not want to report all the 12408914f4baSMarcelo Ricardo Leitner * errors, if the incoming chunk is large. If it can't fit in a single 12418914f4baSMarcelo Ricardo Leitner * packet, we ignore it. 12425fa782c2SNeil Horman */ 12438914f4baSMarcelo Ricardo Leitner static inline struct sctp_chunk *sctp_make_op_error_limited( 12445fa782c2SNeil Horman const struct sctp_association *asoc, 12455fa782c2SNeil Horman const struct sctp_chunk *chunk) 12465fa782c2SNeil Horman { 12478914f4baSMarcelo Ricardo Leitner size_t size = SCTP_DEFAULT_MAXSEGMENT; 12488914f4baSMarcelo Ricardo Leitner struct sctp_sock *sp = NULL; 12495fa782c2SNeil Horman 12508914f4baSMarcelo Ricardo Leitner if (asoc) { 12518914f4baSMarcelo Ricardo Leitner size = min_t(size_t, size, asoc->pathmtu); 12528914f4baSMarcelo Ricardo Leitner sp = sctp_sk(asoc->base.sk); 12538914f4baSMarcelo Ricardo Leitner } 12548914f4baSMarcelo Ricardo Leitner 12558914f4baSMarcelo Ricardo Leitner size = sctp_mtu_payload(sp, size, sizeof(struct sctp_errhdr)); 12565fa782c2SNeil Horman 12575fa782c2SNeil Horman return sctp_make_op_error_space(asoc, chunk, size); 12585fa782c2SNeil Horman } 12595fa782c2SNeil Horman 12601da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 12611da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 12621da177e4SLinus Torvalds const struct sctp_chunk *chunk, 126363706c5cSAl Viro __be16 cause_code, const void *payload, 12646383cfb3SVlad Yasevich size_t paylen, size_t reserve_tail) 12651da177e4SLinus Torvalds { 12661da177e4SLinus Torvalds struct sctp_chunk *retval; 12671da177e4SLinus Torvalds 12686383cfb3SVlad Yasevich retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); 12691da177e4SLinus Torvalds if (!retval) 12701da177e4SLinus Torvalds goto nodata; 12711da177e4SLinus Torvalds 12726383cfb3SVlad Yasevich sctp_init_cause(retval, cause_code, paylen + reserve_tail); 127300f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 12746383cfb3SVlad Yasevich if (reserve_tail) 12756383cfb3SVlad Yasevich sctp_addto_param(retval, reserve_tail, NULL); 12761da177e4SLinus Torvalds 12771da177e4SLinus Torvalds nodata: 12781da177e4SLinus Torvalds return retval; 12791da177e4SLinus Torvalds } 12801da177e4SLinus Torvalds 12811b1e0bc9SXin Long struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc, 12821b1e0bc9SXin Long __u16 key_id) 12834cd57c80SVlad Yasevich { 12844cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 1285327c0dabSXin Long struct sctp_hmac *hmac_desc; 1286327c0dabSXin Long struct sctp_chunk *retval; 12874cd57c80SVlad Yasevich 12884cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 12894cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 12904cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 12914cd57c80SVlad Yasevich return NULL; 12924cd57c80SVlad Yasevich 1293072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, 129496f7ef4dSXin Long hmac_desc->hmac_len + sizeof(auth_hdr), 1295cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 12964cd57c80SVlad Yasevich if (!retval) 12974cd57c80SVlad Yasevich return NULL; 12984cd57c80SVlad Yasevich 12994cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 13001b1e0bc9SXin Long auth_hdr.shkey_id = htons(key_id); 13014cd57c80SVlad Yasevich 130296f7ef4dSXin Long retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr), 13034cd57c80SVlad Yasevich &auth_hdr); 13044cd57c80SVlad Yasevich 1305594831a8SMarcelo Ricardo Leitner skb_put_zero(retval->skb, hmac_desc->hmac_len); 13064cd57c80SVlad Yasevich 13074cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 13084cd57c80SVlad Yasevich retval->chunk_hdr->length = 13094cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 13104cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 13114cd57c80SVlad Yasevich 13124cd57c80SVlad Yasevich return retval; 13134cd57c80SVlad Yasevich } 13144cd57c80SVlad Yasevich 13154cd57c80SVlad Yasevich 13161da177e4SLinus Torvalds /******************************************************************** 13171da177e4SLinus Torvalds * 2nd Level Abstractions 13181da177e4SLinus Torvalds ********************************************************************/ 13191da177e4SLinus Torvalds 13201da177e4SLinus Torvalds /* Turn an skb into a chunk. 13211da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 13223dc0a548Swangweidong * 13233dc0a548Swangweidong * sctpimpguide-05.txt Section 2.8.2 13243dc0a548Swangweidong * M1) Each time a new DATA chunk is transmitted 13253dc0a548Swangweidong * set the 'TSN.Missing.Report' count for that TSN to 0. The 13263dc0a548Swangweidong * 'TSN.Missing.Report' count will be used to determine missing chunks 13273dc0a548Swangweidong * and when to fast retransmit. 13283dc0a548Swangweidong * 13291da177e4SLinus Torvalds */ 13301da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 13311da177e4SLinus Torvalds const struct sctp_association *asoc, 1332cea8768fSMarcelo Ricardo Leitner struct sock *sk, gfp_t gfp) 13331da177e4SLinus Torvalds { 13341da177e4SLinus Torvalds struct sctp_chunk *retval; 13351da177e4SLinus Torvalds 1336cea8768fSMarcelo Ricardo Leitner retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp); 13371da177e4SLinus Torvalds 13381da177e4SLinus Torvalds if (!retval) 13391da177e4SLinus Torvalds goto nodata; 1340bb33381dSDaniel Borkmann if (!sk) 1341bb33381dSDaniel Borkmann pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); 13421da177e4SLinus Torvalds 134379af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 13441da177e4SLinus Torvalds retval->skb = skb; 13451da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 13461da177e4SLinus Torvalds retval->singleton = 1; 13471da177e4SLinus Torvalds 1348c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 13491da177e4SLinus Torvalds 13501da177e4SLinus Torvalds /* Polish the bead hole. */ 13511da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 13521da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 13531da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 1354e7f02796SReshetova, Elena refcount_set(&retval->refcnt, 1); 13551da177e4SLinus Torvalds 13561da177e4SLinus Torvalds nodata: 13571da177e4SLinus Torvalds return retval; 13581da177e4SLinus Torvalds } 13591da177e4SLinus Torvalds 13601da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 13611da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 13621da177e4SLinus Torvalds union sctp_addr *dest) 13631da177e4SLinus Torvalds { 1364f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 136516b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 13661da177e4SLinus Torvalds } 13671da177e4SLinus Torvalds 13681da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 13691da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 13701da177e4SLinus Torvalds { 13711da177e4SLinus Torvalds /* If we have a known transport, use that. */ 13721da177e4SLinus Torvalds if (chunk->transport) { 13736a1e5f33SAl Viro return &chunk->transport->ipaddr; 13741da177e4SLinus Torvalds } else { 13751da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 13766a1e5f33SAl Viro return &chunk->source; 13771da177e4SLinus Torvalds } 13781da177e4SLinus Torvalds } 13791da177e4SLinus Torvalds 13801da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 13811da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 13821da177e4SLinus Torvalds */ 1383072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 1384cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1385cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 13861da177e4SLinus Torvalds { 1387922dbc5bSXin Long struct sctp_chunkhdr *chunk_hdr; 1388327c0dabSXin Long struct sctp_chunk *retval; 13891da177e4SLinus Torvalds struct sk_buff *skb; 13901da177e4SLinus Torvalds struct sock *sk; 139107f2c7abSAlexey Kodanev int chunklen; 139207f2c7abSAlexey Kodanev 139307f2c7abSAlexey Kodanev chunklen = SCTP_PAD4(sizeof(*chunk_hdr) + paylen); 139407f2c7abSAlexey Kodanev if (chunklen > SCTP_MAX_CHUNK_LEN) 139507f2c7abSAlexey Kodanev goto nodata; 13961da177e4SLinus Torvalds 13971da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 139807f2c7abSAlexey Kodanev skb = alloc_skb(chunklen, gfp); 13991da177e4SLinus Torvalds if (!skb) 14001da177e4SLinus Torvalds goto nodata; 14011da177e4SLinus Torvalds 14021da177e4SLinus Torvalds /* Make room for the chunk header. */ 1403922dbc5bSXin Long chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr)); 14041da177e4SLinus Torvalds chunk_hdr->type = type; 14051da177e4SLinus Torvalds chunk_hdr->flags = flags; 1406922dbc5bSXin Long chunk_hdr->length = htons(sizeof(*chunk_hdr)); 14071da177e4SLinus Torvalds 14081da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 1409cea8768fSMarcelo Ricardo Leitner retval = sctp_chunkify(skb, asoc, sk, gfp); 14101da177e4SLinus Torvalds if (!retval) { 14111da177e4SLinus Torvalds kfree_skb(skb); 14121da177e4SLinus Torvalds goto nodata; 14131da177e4SLinus Torvalds } 14141da177e4SLinus Torvalds 14151da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 1416922dbc5bSXin Long retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr); 14171da177e4SLinus Torvalds 14184cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 14194cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 14204cd57c80SVlad Yasevich retval->auth = 1; 14214cd57c80SVlad Yasevich 14221da177e4SLinus Torvalds return retval; 14231da177e4SLinus Torvalds nodata: 14241da177e4SLinus Torvalds return NULL; 14251da177e4SLinus Torvalds } 14261da177e4SLinus Torvalds 1427072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 1428cea8768fSMarcelo Ricardo Leitner __u8 flags, int paylen, gfp_t gfp) 1429072017b4SVlad Yasevich { 1430cea8768fSMarcelo Ricardo Leitner return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp); 1431072017b4SVlad Yasevich } 1432072017b4SVlad Yasevich 1433ad05a7a0SXin Long struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc, 1434ad05a7a0SXin Long __u8 flags, int paylen, gfp_t gfp) 1435ad05a7a0SXin Long { 1436ad05a7a0SXin Long return _sctp_make_chunk(asoc, SCTP_CID_I_DATA, flags, paylen, gfp); 1437ad05a7a0SXin Long } 1438ad05a7a0SXin Long 1439072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 1440cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1441cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 1442072017b4SVlad Yasevich { 1443cea8768fSMarcelo Ricardo Leitner struct sctp_chunk *chunk; 1444072017b4SVlad Yasevich 1445cea8768fSMarcelo Ricardo Leitner chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp); 1446072017b4SVlad Yasevich if (chunk) 1447072017b4SVlad Yasevich sctp_control_set_owner_w(chunk); 1448072017b4SVlad Yasevich 1449072017b4SVlad Yasevich return chunk; 1450072017b4SVlad Yasevich } 14511da177e4SLinus Torvalds 14521da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 14531da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 14541da177e4SLinus Torvalds { 1455a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1456a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1457a08de64dSVlad Yasevich 1458c485658bSDaniel Borkmann consume_skb(chunk->skb); 1459c485658bSDaniel Borkmann consume_skb(chunk->auth_chunk); 14601da177e4SLinus Torvalds 14611da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 14621da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 14631da177e4SLinus Torvalds } 14641da177e4SLinus Torvalds 14651da177e4SLinus Torvalds /* Possibly, free the chunk. */ 14661da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 14671da177e4SLinus Torvalds { 14681da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 14691da177e4SLinus Torvalds if (chunk->msg) 14701da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 14711da177e4SLinus Torvalds 14721da177e4SLinus Torvalds sctp_chunk_put(chunk); 14731da177e4SLinus Torvalds } 14741da177e4SLinus Torvalds 14751da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 14761da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 14771da177e4SLinus Torvalds { 1478e7f02796SReshetova, Elena refcount_inc(&ch->refcnt); 14791da177e4SLinus Torvalds } 14801da177e4SLinus Torvalds 14811da177e4SLinus Torvalds /* Release a reference to the chunk. */ 14821da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 14831da177e4SLinus Torvalds { 1484e7f02796SReshetova, Elena if (refcount_dec_and_test(&ch->refcnt)) 14851da177e4SLinus Torvalds sctp_chunk_destroy(ch); 14861da177e4SLinus Torvalds } 14871da177e4SLinus Torvalds 14881da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 14891da177e4SLinus Torvalds * enough. 14901da177e4SLinus Torvalds */ 14911da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 14921da177e4SLinus Torvalds { 14931da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 1494e2f036a9SMarcelo Ricardo Leitner int padlen = SCTP_PAD4(chunklen) - chunklen; 1495327c0dabSXin Long void *target; 14961da177e4SLinus Torvalds 1497b952f4dfSyuan linyu skb_put_zero(chunk->skb, padlen); 149859ae1d12SJohannes Berg target = skb_put_data(chunk->skb, data, len); 14991da177e4SLinus Torvalds 15001da177e4SLinus Torvalds /* Adjust the chunk length field. */ 15011da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 150227a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 15031da177e4SLinus Torvalds 15041da177e4SLinus Torvalds return target; 15051da177e4SLinus Torvalds } 15061da177e4SLinus Torvalds 15071da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 15081da177e4SLinus Torvalds * chunk is not big enough. 15091da177e4SLinus Torvalds * Returns a kernel err value. 15101da177e4SLinus Torvalds */ 1511e0eb093eSAl Viro int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 1512e0eb093eSAl Viro struct iov_iter *from) 15131da177e4SLinus Torvalds { 1514e0eb093eSAl Viro void *target; 15151da177e4SLinus Torvalds 15161da177e4SLinus Torvalds /* Make room in chunk for data. */ 15171da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 15181da177e4SLinus Torvalds 15191da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 15203b6d4dbfSAl Viro if (!copy_from_iter_full(target, len, from)) 1521e0eb093eSAl Viro return -EFAULT; 15221da177e4SLinus Torvalds 15231da177e4SLinus Torvalds /* Adjust the chunk length field. */ 15241da177e4SLinus Torvalds chunk->chunk_hdr->length = 15251da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 152627a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 15271da177e4SLinus Torvalds 1528e0eb093eSAl Viro return 0; 15291da177e4SLinus Torvalds } 15301da177e4SLinus Torvalds 15311da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15321da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15331da177e4SLinus Torvalds */ 15341da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 15351da177e4SLinus Torvalds { 1536ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 1537327c0dabSXin Long struct sctp_chunk *lchunk; 1538327c0dabSXin Long struct sctp_datamsg *msg; 1539327c0dabSXin Long __u16 ssn, sid; 15401da177e4SLinus Torvalds 15411da177e4SLinus Torvalds if (chunk->has_ssn) 15421da177e4SLinus Torvalds return; 15431da177e4SLinus Torvalds 1544ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1545ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1546cee360abSXin Long stream = &chunk->asoc->stream; 1547ab3e5e7bSVlad Yasevich 1548ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1549ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1550ab3e5e7bSVlad Yasevich */ 1551ab3e5e7bSVlad Yasevich msg = chunk->msg; 1552ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1553ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 15541da177e4SLinus Torvalds ssn = 0; 15551da177e4SLinus Torvalds } else { 1556ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1557a8386317SXin Long ssn = sctp_ssn_next(stream, out, sid); 15581da177e4SLinus Torvalds else 1559a8386317SXin Long ssn = sctp_ssn_peek(stream, out, sid); 15601da177e4SLinus Torvalds } 15611da177e4SLinus Torvalds 1562ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1563ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1564ab3e5e7bSVlad Yasevich } 15651da177e4SLinus Torvalds } 15661da177e4SLinus Torvalds 15671da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15681da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15691da177e4SLinus Torvalds */ 15701da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 15711da177e4SLinus Torvalds { 15721da177e4SLinus Torvalds if (!chunk->has_tsn) { 15731da177e4SLinus Torvalds /* This is the last possible instant to 15741da177e4SLinus Torvalds * assign a TSN. 15751da177e4SLinus Torvalds */ 15761da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 15771da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 15781da177e4SLinus Torvalds chunk->has_tsn = 1; 15791da177e4SLinus Torvalds } 15801da177e4SLinus Torvalds } 15811da177e4SLinus Torvalds 15821da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 15831da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 15843182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1585dd0fc66fSAl Viro gfp_t gfp) 15861da177e4SLinus Torvalds { 15871da177e4SLinus Torvalds struct sctp_association *asoc; 15881c662018SXin Long enum sctp_scope scope; 15891da177e4SLinus Torvalds struct sk_buff *skb; 15901da177e4SLinus Torvalds 15911da177e4SLinus Torvalds /* Create the bare association. */ 15921da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 15931da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 15941da177e4SLinus Torvalds if (!asoc) 15951da177e4SLinus Torvalds goto nodata; 15961da177e4SLinus Torvalds asoc->temp = 1; 15971da177e4SLinus Torvalds skb = chunk->skb; 15981da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1599e7487c86SMarcelo Ricardo Leitner SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1); 1600e7487c86SMarcelo Ricardo Leitner 16011da177e4SLinus Torvalds nodata: 16021da177e4SLinus Torvalds return asoc; 16031da177e4SLinus Torvalds } 16041da177e4SLinus Torvalds 16051da177e4SLinus Torvalds /* Build a cookie representing asoc. 16061da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 16071da177e4SLinus Torvalds */ 1608f48ef4c7SXin Long static struct sctp_cookie_param *sctp_pack_cookie( 1609f48ef4c7SXin Long const struct sctp_endpoint *ep, 16101da177e4SLinus Torvalds const struct sctp_association *asoc, 16111da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 1612327c0dabSXin Long int *cookie_len, const __u8 *raw_addrs, 1613327c0dabSXin Long int addrs_len) 16141da177e4SLinus Torvalds { 16151da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 1616f48ef4c7SXin Long struct sctp_cookie_param *retval; 16171da177e4SLinus Torvalds int headersize, bodysize; 16181da177e4SLinus Torvalds 16199834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 16209834a2bbSVlad Yasevich * any padding. 16219834a2bbSVlad Yasevich */ 16223c918704SXin Long headersize = sizeof(struct sctp_paramhdr) + 16239834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 16249834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 16251da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 16261da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 16271da177e4SLinus Torvalds 16281da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 16291da177e4SLinus Torvalds * functions simpler to write. 16301da177e4SLinus Torvalds */ 16311da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 16321da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 16331da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 16341da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 16351da177e4SLinus Torvalds 16361da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 16371da177e4SLinus Torvalds * out on the network. 16381da177e4SLinus Torvalds */ 1639af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1640af997d8cSArnaldo Carvalho de Melo if (!retval) 1641af997d8cSArnaldo Carvalho de Melo goto nodata; 1642af997d8cSArnaldo Carvalho de Melo 16431da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 16441da177e4SLinus Torvalds 16451da177e4SLinus Torvalds /* Set up the parameter header. */ 16461da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 16471da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 16481da177e4SLinus Torvalds 16491da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 16501da177e4SLinus Torvalds cookie->c = asoc->c; 16511da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 16521da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 16531da177e4SLinus Torvalds 16541da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 16551da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 16561da177e4SLinus Torvalds 16570f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 16580f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 16591da177e4SLinus Torvalds 16601da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 166152db882fSDaniel Borkmann cookie->c.expiration = ktime_add(asoc->cookie_life, 1662cb5e173eSMarcelo Ricardo Leitner ktime_get_real()); 16631da177e4SLinus Torvalds 16641da177e4SLinus Torvalds /* Copy the peer's init packet. */ 16651da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 16661da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 16671da177e4SLinus Torvalds 16681da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 16691da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 16701da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 16711da177e4SLinus Torvalds 16721da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 167375b93c63SEric Biggers struct crypto_shash *tfm = sctp_sk(ep->base.sk)->hmac; 16745821c769SHerbert Xu int err; 16751b489e11SHerbert Xu 16761da177e4SLinus Torvalds /* Sign the message. */ 167775b93c63SEric Biggers err = crypto_shash_setkey(tfm, ep->secret_key, 16785821c769SHerbert Xu sizeof(ep->secret_key)) ?: 167975b93c63SEric Biggers crypto_shash_tfm_digest(tfm, (u8 *)&cookie->c, bodysize, 16805821c769SHerbert Xu cookie->signature); 16815821c769SHerbert Xu if (err) 16821b489e11SHerbert Xu goto free_cookie; 16831da177e4SLinus Torvalds } 16841da177e4SLinus Torvalds 16851da177e4SLinus Torvalds return retval; 16861b489e11SHerbert Xu 16871b489e11SHerbert Xu free_cookie: 16881b489e11SHerbert Xu kfree(retval); 16891b489e11SHerbert Xu nodata: 16901b489e11SHerbert Xu *cookie_len = 0; 16911b489e11SHerbert Xu return NULL; 16921da177e4SLinus Torvalds } 16931da177e4SLinus Torvalds 16941da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 16951da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 16961da177e4SLinus Torvalds const struct sctp_endpoint *ep, 16971da177e4SLinus Torvalds const struct sctp_association *asoc, 1698dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 16991da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 17001da177e4SLinus Torvalds { 17011da177e4SLinus Torvalds struct sctp_association *retval = NULL; 17021da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1703327c0dabSXin Long struct sctp_signed_cookie *cookie; 17041da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 1705327c0dabSXin Long struct sctp_cookie *bear_cookie; 1706327c0dabSXin Long __u8 *digest = ep->digest; 1707327c0dabSXin Long enum sctp_scope scope; 1708327c0dabSXin Long unsigned int len; 170952db882fSDaniel Borkmann ktime_t kt; 17101da177e4SLinus Torvalds 17119834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 17129834a2bbSVlad Yasevich * any padding. 17139834a2bbSVlad Yasevich */ 1714922dbc5bSXin Long headersize = sizeof(struct sctp_chunkhdr) + 17159834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 17169834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 17171da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 17181da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 17191da177e4SLinus Torvalds 17201da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 17211da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 17221da177e4SLinus Torvalds * INIT chunk. 17231da177e4SLinus Torvalds */ 17241da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17251da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 17261da177e4SLinus Torvalds goto malformed; 17271da177e4SLinus Torvalds 17281da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 17291da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 17301da177e4SLinus Torvalds goto malformed; 17311da177e4SLinus Torvalds 17321da177e4SLinus Torvalds /* Process the cookie. */ 17331da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 17341da177e4SLinus Torvalds bear_cookie = &cookie->c; 17351da177e4SLinus Torvalds 17361da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 17371da177e4SLinus Torvalds goto no_hmac; 17381da177e4SLinus Torvalds 17391da177e4SLinus Torvalds /* Check the signature. */ 17405821c769SHerbert Xu { 174175b93c63SEric Biggers struct crypto_shash *tfm = sctp_sk(ep->base.sk)->hmac; 17425821c769SHerbert Xu int err; 17431da177e4SLinus Torvalds 174475b93c63SEric Biggers err = crypto_shash_setkey(tfm, ep->secret_key, 17455821c769SHerbert Xu sizeof(ep->secret_key)) ?: 174675b93c63SEric Biggers crypto_shash_tfm_digest(tfm, (u8 *)bear_cookie, bodysize, 17475821c769SHerbert Xu digest); 17485821c769SHerbert Xu if (err) { 17491b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17501b489e11SHerbert Xu goto fail; 17511b489e11SHerbert Xu } 17525821c769SHerbert Xu } 17531da177e4SLinus Torvalds 17541da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 17551da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 17561da177e4SLinus Torvalds goto fail; 17571da177e4SLinus Torvalds } 17581da177e4SLinus Torvalds 17591da177e4SLinus Torvalds no_hmac: 17601da177e4SLinus Torvalds /* IG Section 2.35.2: 17611da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 17621da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 17631da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 17641da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 17651da177e4SLinus Torvalds * discarded, 17661da177e4SLinus Torvalds */ 17671da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 17681da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 17691da177e4SLinus Torvalds goto fail; 17701da177e4SLinus Torvalds } 17711da177e4SLinus Torvalds 17729b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 17731da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 17741da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 17751da177e4SLinus Torvalds goto fail; 17761da177e4SLinus Torvalds } 17771da177e4SLinus Torvalds 17781da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 17791da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 17801da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1781f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1782f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1783f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1784f236218bSVlad Yasevich * down the new association establishment instead of every packet. 17851da177e4SLinus Torvalds */ 1786f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 178752db882fSDaniel Borkmann kt = skb_get_ktime(skb); 1788f236218bSVlad Yasevich else 1789cb5e173eSMarcelo Ricardo Leitner kt = ktime_get_real(); 1790f236218bSVlad Yasevich 179167cb9366SDaniel Borkmann if (!asoc && ktime_before(bear_cookie->expiration, kt)) { 17928914f4baSMarcelo Ricardo Leitner suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); 17938914f4baSMarcelo Ricardo Leitner __be32 n = htonl(usecs); 17948914f4baSMarcelo Ricardo Leitner 17951da177e4SLinus Torvalds /* 17961da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 17971da177e4SLinus Torvalds * 17981da177e4SLinus Torvalds * Cause of error 17991da177e4SLinus Torvalds * --------------- 18001da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 18011da177e4SLinus Torvalds * Cookie that has expired. 18021da177e4SLinus Torvalds */ 18038914f4baSMarcelo Ricardo Leitner *errp = sctp_make_op_error(asoc, chunk, 18048914f4baSMarcelo Ricardo Leitner SCTP_ERROR_STALE_COOKIE, &n, 18058914f4baSMarcelo Ricardo Leitner sizeof(n), 0); 18068914f4baSMarcelo Ricardo Leitner if (*errp) 18071da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 18088914f4baSMarcelo Ricardo Leitner else 18091da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18101da177e4SLinus Torvalds 18111da177e4SLinus Torvalds goto fail; 18121da177e4SLinus Torvalds } 18131da177e4SLinus Torvalds 18141da177e4SLinus Torvalds /* Make a new base association. */ 18151da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 18161da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 18171da177e4SLinus Torvalds if (!retval) { 18181da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18191da177e4SLinus Torvalds goto fail; 18201da177e4SLinus Torvalds } 18211da177e4SLinus Torvalds 18221da177e4SLinus Torvalds /* Set up our peer's port number. */ 18231da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 18241da177e4SLinus Torvalds 18251da177e4SLinus Torvalds /* Populate the association from the cookie. */ 18261da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 18271da177e4SLinus Torvalds 18281da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 18291da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 18301da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18311da177e4SLinus Torvalds goto fail; 18321da177e4SLinus Torvalds } 18331da177e4SLinus Torvalds 18341da177e4SLinus Torvalds /* Also, add the destination address. */ 18351da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1836f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1837133800d1SMarcelo Ricardo Leitner sizeof(chunk->dest), SCTP_ADDR_SRC, 1838133800d1SMarcelo Ricardo Leitner GFP_ATOMIC); 18391da177e4SLinus Torvalds } 18401da177e4SLinus Torvalds 18411da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 18421da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 18431da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 1844cc16f00fSXin Long retval->strreset_outseq = retval->c.initial_tsn; 18451da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 18461da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 18470f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 18481da177e4SLinus Torvalds 18491da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 18501da177e4SLinus Torvalds return retval; 18511da177e4SLinus Torvalds 18521da177e4SLinus Torvalds fail: 18531da177e4SLinus Torvalds if (retval) 18541da177e4SLinus Torvalds sctp_association_free(retval); 18551da177e4SLinus Torvalds 18561da177e4SLinus Torvalds return NULL; 18571da177e4SLinus Torvalds 18581da177e4SLinus Torvalds malformed: 18591da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 18601da177e4SLinus Torvalds * malformed. 18611da177e4SLinus Torvalds */ 18621da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 18631da177e4SLinus Torvalds goto fail; 18641da177e4SLinus Torvalds } 18651da177e4SLinus Torvalds 18661da177e4SLinus Torvalds /******************************************************************** 18671da177e4SLinus Torvalds * 3rd Level Abstractions 18681da177e4SLinus Torvalds ********************************************************************/ 18691da177e4SLinus Torvalds 18701da177e4SLinus Torvalds struct __sctp_missing { 18719f81bcd9SAl Viro __be32 num_missing; 18729f81bcd9SAl Viro __be16 type; 1873bc10502dSEric Dumazet } __packed; 18741da177e4SLinus Torvalds 18751da177e4SLinus Torvalds /* 18761da177e4SLinus Torvalds * Report a missing mandatory parameter. 18771da177e4SLinus Torvalds */ 18781da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 187934b4e29bSXin Long enum sctp_param paramtype, 18801da177e4SLinus Torvalds struct sctp_chunk *chunk, 18811da177e4SLinus Torvalds struct sctp_chunk **errp) 18821da177e4SLinus Torvalds { 18831da177e4SLinus Torvalds struct __sctp_missing report; 18841da177e4SLinus Torvalds __u16 len; 18851da177e4SLinus Torvalds 1886e2f036a9SMarcelo Ricardo Leitner len = SCTP_PAD4(sizeof(report)); 18871da177e4SLinus Torvalds 18881da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 18891da177e4SLinus Torvalds * returning multiple unknown parameters. 18901da177e4SLinus Torvalds */ 18911da177e4SLinus Torvalds if (!*errp) 18921da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18931da177e4SLinus Torvalds 18941da177e4SLinus Torvalds if (*errp) { 18951da177e4SLinus Torvalds report.num_missing = htonl(1); 18961da177e4SLinus Torvalds report.type = paramtype; 1897ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 189800f1c2dfSWei Yongjun sizeof(report)); 189900f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 19001da177e4SLinus Torvalds } 19011da177e4SLinus Torvalds 19021da177e4SLinus Torvalds /* Stop processing this chunk. */ 19031da177e4SLinus Torvalds return 0; 19041da177e4SLinus Torvalds } 19051da177e4SLinus Torvalds 19061da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 19071da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 19081da177e4SLinus Torvalds struct sctp_chunk *chunk, 19091da177e4SLinus Torvalds struct sctp_chunk **errp) 19101da177e4SLinus Torvalds { 19111da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 19121da177e4SLinus Torvalds 19131da177e4SLinus Torvalds if (!*errp) 19141da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 19151da177e4SLinus Torvalds 19161da177e4SLinus Torvalds if (*errp) 191700f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 19181da177e4SLinus Torvalds 19191da177e4SLinus Torvalds /* Stop processing this chunk. */ 19201da177e4SLinus Torvalds return 0; 19211da177e4SLinus Torvalds } 19221da177e4SLinus Torvalds 19231da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 19241da177e4SLinus Torvalds struct sctp_paramhdr *param, 19251da177e4SLinus Torvalds const struct sctp_chunk *chunk, 19261da177e4SLinus Torvalds struct sctp_chunk **errp) 19271da177e4SLinus Torvalds { 19287ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 19297ab90804SVlad Yasevich * not reported. 19307ab90804SVlad Yasevich */ 19317ab90804SVlad Yasevich if (*errp) 19327ab90804SVlad Yasevich sctp_chunk_free(*errp); 19337ab90804SVlad Yasevich 19341da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1935ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 19361da177e4SLinus Torvalds 19371da177e4SLinus Torvalds return 0; 19381da177e4SLinus Torvalds } 19391da177e4SLinus Torvalds 19401da177e4SLinus Torvalds 19411da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 19421da177e4SLinus Torvalds * send back an indicator to the peer. 19431da177e4SLinus Torvalds */ 19441da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 19451da177e4SLinus Torvalds union sctp_params param, 19461da177e4SLinus Torvalds struct sctp_chunk *chunk, 19471da177e4SLinus Torvalds struct sctp_chunk **errp) 19481da177e4SLinus Torvalds { 19491da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 19501da177e4SLinus Torvalds 19517ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 19527ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 19537ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 19547ab90804SVlad Yasevich * them in the ABORT. 19557ab90804SVlad Yasevich */ 19567ab90804SVlad Yasevich if (*errp) 19577ab90804SVlad Yasevich sctp_chunk_free(*errp); 19587ab90804SVlad Yasevich 19598914f4baSMarcelo Ricardo Leitner *errp = sctp_make_op_error(asoc, chunk, SCTP_ERROR_DNS_FAILED, 19608914f4baSMarcelo Ricardo Leitner param.v, len, 0); 19611da177e4SLinus Torvalds 19621da177e4SLinus Torvalds /* Stop processing this chunk. */ 19631da177e4SLinus Torvalds return 0; 19641da177e4SLinus Torvalds } 19651da177e4SLinus Torvalds 19664e27428fSXin Long static int sctp_verify_ext_param(struct net *net, 19674e27428fSXin Long const struct sctp_endpoint *ep, 19684e27428fSXin Long union sctp_params param) 1969d6701191SVlad Yasevich { 19703c918704SXin Long __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 1971d6701191SVlad Yasevich int have_asconf = 0; 1972327c0dabSXin Long int have_auth = 0; 1973d6701191SVlad Yasevich int i; 1974d6701191SVlad Yasevich 1975d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 1976d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 1977d6701191SVlad Yasevich case SCTP_CID_AUTH: 1978d6701191SVlad Yasevich have_auth = 1; 1979d6701191SVlad Yasevich break; 1980d6701191SVlad Yasevich case SCTP_CID_ASCONF: 1981d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 1982d6701191SVlad Yasevich have_asconf = 1; 1983d6701191SVlad Yasevich break; 1984d6701191SVlad Yasevich } 1985d6701191SVlad Yasevich } 1986d6701191SVlad Yasevich 1987d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 1988d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 1989d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 1990d6701191SVlad Yasevich * mode. 1991d6701191SVlad Yasevich */ 1992e1fc3b14SEric W. Biederman if (net->sctp.addip_noauth) 1993d6701191SVlad Yasevich return 1; 1994d6701191SVlad Yasevich 19954e27428fSXin Long if (ep->asconf_enable && !have_auth && have_asconf) 1996d6701191SVlad Yasevich return 0; 1997d6701191SVlad Yasevich 1998d6701191SVlad Yasevich return 1; 1999d6701191SVlad Yasevich } 2000d6701191SVlad Yasevich 2001131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 2002131a47e3SVlad Yasevich union sctp_params param) 2003131a47e3SVlad Yasevich { 20043c918704SXin Long __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 2005131a47e3SVlad Yasevich int i; 2006131a47e3SVlad Yasevich 2007131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 2008131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 2009c28445c3SXin Long case SCTP_CID_RECONF: 2010a96701fbSXin Long if (asoc->ep->reconf_enable) 2011c28445c3SXin Long asoc->peer.reconf_capable = 1; 2012c28445c3SXin Long break; 2013131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 20141c134753SXin Long if (asoc->ep->prsctp_enable) 2015131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 2016131a47e3SVlad Yasevich break; 2017730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 2018730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 2019730fc3d0SVlad Yasevich * supports AUTH. 2020730fc3d0SVlad Yasevich */ 2021b14878ccSVlad Yasevich if (asoc->ep->auth_enable) 2022730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 2023730fc3d0SVlad Yasevich break; 2024131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 2025131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 20264e27428fSXin Long if (asoc->ep->asconf_enable) 202788799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 20286b2f9cb6SVlad Yasevich break; 202996b120b3SXin Long case SCTP_CID_I_DATA: 2030e55f4b8bSXin Long if (asoc->ep->intl_enable) 2031da1f6d4dSXin Long asoc->peer.intl_capable = 1; 203296b120b3SXin Long break; 2033131a47e3SVlad Yasevich default: 2034131a47e3SVlad Yasevich break; 2035131a47e3SVlad Yasevich } 2036131a47e3SVlad Yasevich } 2037131a47e3SVlad Yasevich } 2038131a47e3SVlad Yasevich 20391da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 20401da177e4SLinus Torvalds * 20411da177e4SLinus Torvalds * The Parameter Types are encoded such that the 20421da177e4SLinus Torvalds * highest-order two bits specify the action that must be 20431da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 20441da177e4SLinus Torvalds * Parameter Type. 20451da177e4SLinus Torvalds * 20467ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 20477ab90804SVlad Yasevich * parameters within this chunk 20481da177e4SLinus Torvalds * 20497ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 20507ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 20517ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 20521da177e4SLinus Torvalds * 20531da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 20541da177e4SLinus Torvalds * 20551da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 20561da177e4SLinus Torvalds * report the unrecognized parameter in an 20577ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 20581da177e4SLinus Torvalds * 20591da177e4SLinus Torvalds * Return value: 20607ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20617ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 20627ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 20631da177e4SLinus Torvalds */ 20644785c7aeSXin Long static enum sctp_ierror sctp_process_unk_param( 20654785c7aeSXin Long const struct sctp_association *asoc, 20661da177e4SLinus Torvalds union sctp_params param, 20671da177e4SLinus Torvalds struct sctp_chunk *chunk, 20681da177e4SLinus Torvalds struct sctp_chunk **errp) 20691da177e4SLinus Torvalds { 20707ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 20711da177e4SLinus Torvalds 20721da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 20731da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 20747ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20751da177e4SLinus Torvalds break; 20761da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 20771da177e4SLinus Torvalds break; 20787ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 20797ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 2080df561f66SGustavo A. R. Silva fallthrough; 20811da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 20821da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 20831da177e4SLinus Torvalds * returning multiple unknown parameters. 20841da177e4SLinus Torvalds */ 20858914f4baSMarcelo Ricardo Leitner if (!*errp) { 20868914f4baSMarcelo Ricardo Leitner *errp = sctp_make_op_error_limited(asoc, chunk); 20878914f4baSMarcelo Ricardo Leitner if (!*errp) { 20888914f4baSMarcelo Ricardo Leitner /* If there is no memory for generating the 20898914f4baSMarcelo Ricardo Leitner * ERROR report as specified, an ABORT will be 20908914f4baSMarcelo Ricardo Leitner * triggered to the peer and the association 20918914f4baSMarcelo Ricardo Leitner * won't be established. 20921da177e4SLinus Torvalds */ 20937ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 20948914f4baSMarcelo Ricardo Leitner break; 20951da177e4SLinus Torvalds } 20968914f4baSMarcelo Ricardo Leitner } 20978914f4baSMarcelo Ricardo Leitner 20988914f4baSMarcelo Ricardo Leitner if (!sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, 20998914f4baSMarcelo Ricardo Leitner ntohs(param.p->length))) 21008914f4baSMarcelo Ricardo Leitner sctp_addto_chunk(*errp, ntohs(param.p->length), 21018914f4baSMarcelo Ricardo Leitner param.v); 21021da177e4SLinus Torvalds break; 21031da177e4SLinus Torvalds default: 21041da177e4SLinus Torvalds break; 21051da177e4SLinus Torvalds } 21061da177e4SLinus Torvalds 21071da177e4SLinus Torvalds return retval; 21081da177e4SLinus Torvalds } 21091da177e4SLinus Torvalds 21107ab90804SVlad Yasevich /* Verify variable length parameters 21111da177e4SLinus Torvalds * Return values: 21127ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 21137ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 21147ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 21157ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 21161da177e4SLinus Torvalds */ 21174785c7aeSXin Long static enum sctp_ierror sctp_verify_param(struct net *net, 2118b14878ccSVlad Yasevich const struct sctp_endpoint *ep, 2119f53b5b09SEric W. Biederman const struct sctp_association *asoc, 21201da177e4SLinus Torvalds union sctp_params param, 21216d85e68fSXin Long enum sctp_cid cid, 21221da177e4SLinus Torvalds struct sctp_chunk *chunk, 21231da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 21241da177e4SLinus Torvalds { 212572da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 21267ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 212772da7b38SWei Yongjun __u16 n_elt, id = 0; 212872da7b38SWei Yongjun int i; 21291da177e4SLinus Torvalds 21301da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 21311da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 21321da177e4SLinus Torvalds * identified based on the chunk id. 21331da177e4SLinus Torvalds */ 21341da177e4SLinus Torvalds 21351da177e4SLinus Torvalds switch (param.p->type) { 21361da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 21371da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 21381da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 21391da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 21401da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 21411da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 21421da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 21431da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 21440f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2145d6701191SVlad Yasevich break; 2146d6701191SVlad Yasevich 2147131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 21484e27428fSXin Long if (!sctp_verify_ext_param(net, ep, param)) 2149d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 21501da177e4SLinus Torvalds break; 21511da177e4SLinus Torvalds 2152d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 21534e27428fSXin Long if (ep->asconf_enable) 2154d6de3097SVlad Yasevich break; 215548f9bcf9SJoe Perches goto unhandled; 2156d6de3097SVlad Yasevich 21571da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 21581da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 21597ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 21607ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21617ab90804SVlad Yasevich break; 2162131a47e3SVlad Yasevich 21631da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 216428aa4c26SXin Long if (ep->prsctp_enable) 21651da177e4SLinus Torvalds break; 216648f9bcf9SJoe Perches goto unhandled; 2167730fc3d0SVlad Yasevich 2168730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2169b14878ccSVlad Yasevich if (!ep->auth_enable) 217048f9bcf9SJoe Perches goto unhandled; 2171730fc3d0SVlad Yasevich 2172730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2173730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2174730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2175730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2176730fc3d0SVlad Yasevich */ 21778914f4baSMarcelo Ricardo Leitner if (SCTP_AUTH_RANDOM_LENGTH != ntohs(param.p->length) - 21788914f4baSMarcelo Ricardo Leitner sizeof(struct sctp_paramhdr)) { 21797ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2180730fc3d0SVlad Yasevich chunk, err_chunk); 21817ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21827ab90804SVlad Yasevich } 2183730fc3d0SVlad Yasevich break; 2184730fc3d0SVlad Yasevich 2185730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2186b14878ccSVlad Yasevich if (!ep->auth_enable) 218748f9bcf9SJoe Perches goto unhandled; 2188730fc3d0SVlad Yasevich 2189730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2190730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2191730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2192730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2193730fc3d0SVlad Yasevich */ 21947ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 21957ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2196730fc3d0SVlad Yasevich chunk, err_chunk); 21977ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21987ab90804SVlad Yasevich } 2199730fc3d0SVlad Yasevich break; 2200730fc3d0SVlad Yasevich 2201730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2202b14878ccSVlad Yasevich if (!ep->auth_enable) 220348f9bcf9SJoe Perches goto unhandled; 220472da7b38SWei Yongjun 220572da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 22063c918704SXin Long n_elt = (ntohs(param.p->length) - 22073c918704SXin Long sizeof(struct sctp_paramhdr)) >> 1; 220872da7b38SWei Yongjun 220972da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 221072da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 221172da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 221272da7b38SWei Yongjun */ 221372da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 221472da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 221572da7b38SWei Yongjun 221672da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2217730fc3d0SVlad Yasevich break; 221872da7b38SWei Yongjun } 221972da7b38SWei Yongjun 222072da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 222172da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 222272da7b38SWei Yongjun err_chunk); 222372da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 222472da7b38SWei Yongjun } 222572da7b38SWei Yongjun break; 222648f9bcf9SJoe Perches unhandled: 22271da177e4SLinus Torvalds default: 2228bb33381dSDaniel Borkmann pr_debug("%s: unrecognized param:%d for chunk:%d\n", 2229bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), cid); 2230bb33381dSDaniel Borkmann 22317ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 22321da177e4SLinus Torvalds break; 22331da177e4SLinus Torvalds } 22341da177e4SLinus Torvalds return retval; 22351da177e4SLinus Torvalds } 22361da177e4SLinus Torvalds 22371da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 2238b14878ccSVlad Yasevich int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 22396d85e68fSXin Long const struct sctp_association *asoc, enum sctp_cid cid, 224001a992beSXin Long struct sctp_init_chunk *peer_init, 224101a992beSXin Long struct sctp_chunk *chunk, struct sctp_chunk **errp) 22421da177e4SLinus Torvalds { 22431da177e4SLinus Torvalds union sctp_params param; 22447613f5feSDaniel Borkmann bool has_cookie = false; 22457ab90804SVlad Yasevich int result; 22461da177e4SLinus Torvalds 22477613f5feSDaniel Borkmann /* Check for missing mandatory parameters. Note: Initial TSN is 22487613f5feSDaniel Borkmann * also mandatory, but is not checked here since the valid range 22497613f5feSDaniel Borkmann * is 0..2**32-1. RFC4960, section 3.3.3. 22507613f5feSDaniel Borkmann */ 22517613f5feSDaniel Borkmann if (peer_init->init_hdr.num_outbound_streams == 0 || 22527613f5feSDaniel Borkmann peer_init->init_hdr.num_inbound_streams == 0 || 22537613f5feSDaniel Borkmann peer_init->init_hdr.init_tag == 0 || 22547613f5feSDaniel Borkmann ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) 22557ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 22561da177e4SLinus Torvalds 22571da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22587613f5feSDaniel Borkmann if (param.p->type == SCTP_PARAM_STATE_COOKIE) 22597613f5feSDaniel Borkmann has_cookie = true; 22607613f5feSDaniel Borkmann } 22611da177e4SLinus Torvalds 22621da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 22631da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 22641da177e4SLinus Torvalds * The current param.p would point at the bad one. 22651da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 22661da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 22671da177e4SLinus Torvalds * error handling code build and send the packet. 22681da177e4SLinus Torvalds */ 22697ab90804SVlad Yasevich if (param.v != (void *)chunk->chunk_end) 22707ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 22711da177e4SLinus Torvalds 22721da177e4SLinus Torvalds /* The only missing mandatory param possible today is 22731da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 22741da177e4SLinus Torvalds */ 22757ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 22767ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 22771da177e4SLinus Torvalds chunk, errp); 22781da177e4SLinus Torvalds 22797ab90804SVlad Yasevich /* Verify all the variable length parameters */ 22801da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2281b14878ccSVlad Yasevich result = sctp_verify_param(net, ep, asoc, param, cid, 2282b14878ccSVlad Yasevich chunk, errp); 22837ab90804SVlad Yasevich switch (result) { 22847ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 22857ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 22861da177e4SLinus Torvalds return 0; 22877ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 22881da177e4SLinus Torvalds return 1; 22897ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 22907ab90804SVlad Yasevich default: 22917ab90804SVlad Yasevich break; 22921da177e4SLinus Torvalds } 22931da177e4SLinus Torvalds 22941da177e4SLinus Torvalds } /* for (loop through all parameters) */ 22951da177e4SLinus Torvalds 22961da177e4SLinus Torvalds return 1; 22971da177e4SLinus Torvalds } 22981da177e4SLinus Torvalds 22991da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 23001da177e4SLinus Torvalds * Returns 0 on failure, else success. 23011da177e4SLinus Torvalds * FIXME: This is an association method. 23021da177e4SLinus Torvalds */ 2303de6becdcSWei Yongjun int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, 23041da177e4SLinus Torvalds const union sctp_addr *peer_addr, 230501a992beSXin Long struct sctp_init_chunk *peer_init, gfp_t gfp) 23061da177e4SLinus Torvalds { 23071da177e4SLinus Torvalds struct sctp_transport *transport; 23081da177e4SLinus Torvalds struct list_head *pos, *temp; 2309327c0dabSXin Long union sctp_params param; 2310de6becdcSWei Yongjun union sctp_addr addr; 2311327c0dabSXin Long struct sctp_af *af; 2312de6becdcSWei Yongjun int src_match = 0; 23131da177e4SLinus Torvalds 23141da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 23151da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 23161da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 23171da177e4SLinus Torvalds * of the INIT from the cookie. 23181da177e4SLinus Torvalds */ 23191da177e4SLinus Torvalds 23201da177e4SLinus Torvalds /* This implementation defaults to making the first transport 23211da177e4SLinus Torvalds * added as the primary transport. The source address seems to 23221da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 23231da177e4SLinus Torvalds */ 23246a1e5f33SAl Viro if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 23251da177e4SLinus Torvalds goto nomem; 2326de6becdcSWei Yongjun 2327de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) 2328de6becdcSWei Yongjun src_match = 1; 23291da177e4SLinus Torvalds 23301da177e4SLinus Torvalds /* Process the initialization parameters. */ 23311da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2332de6becdcSWei Yongjun if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 2333de6becdcSWei Yongjun param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { 2334de6becdcSWei Yongjun af = sctp_get_af_specific(param_type2af(param.p->type)); 2335de6becdcSWei Yongjun af->from_addr_param(&addr, param.addr, 2336de6becdcSWei Yongjun chunk->sctp_hdr->source, 0); 2337de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) 2338de6becdcSWei Yongjun src_match = 1; 2339de6becdcSWei Yongjun } 23401da177e4SLinus Torvalds 23411da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 23421da177e4SLinus Torvalds goto clean_up; 23431da177e4SLinus Torvalds } 23441da177e4SLinus Torvalds 2345de6becdcSWei Yongjun /* source address of chunk may not match any valid address */ 2346de6becdcSWei Yongjun if (!src_match) 2347de6becdcSWei Yongjun goto clean_up; 2348de6becdcSWei Yongjun 2349730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2350730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2351730fc3d0SVlad Yasevich */ 2352730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2353730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2354730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2355730fc3d0SVlad Yasevich 2356d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2357d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2358d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2359d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2360d6701191SVlad Yasevich * is what we'll do here. 23616b2f9cb6SVlad Yasevich */ 23624e7696d9SXin Long if (!asoc->base.net->sctp.addip_noauth && 236373d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 23646b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 23656b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 23666b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 236788799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2368d6701191SVlad Yasevich goto clean_up; 23696b2f9cb6SVlad Yasevich } 23706b2f9cb6SVlad Yasevich 23713f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 23723f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 23733f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 23743f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 23753f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 23763f7a87d2SFrank Filz } 23773f7a87d2SFrank Filz } 23783f7a87d2SFrank Filz 23791da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 23801da177e4SLinus Torvalds * order. 23811da177e4SLinus Torvalds */ 23821da177e4SLinus Torvalds asoc->peer.i.init_tag = 23831da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 23841da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 23851da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 23861da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 23871da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 23881da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 23891da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 23901da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 23911da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 23921da177e4SLinus Torvalds 2393cc16f00fSXin Long asoc->strreset_inseq = asoc->peer.i.initial_tsn; 2394cc16f00fSXin Long 23951da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 23961da177e4SLinus Torvalds * number of inbound streams. 23971da177e4SLinus Torvalds */ 23981da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 23991da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 24001da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 24011da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 24021da177e4SLinus Torvalds } 24031da177e4SLinus Torvalds 24041da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 24051da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 24061da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 24071da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 24081da177e4SLinus Torvalds } 24091da177e4SLinus Torvalds 24101da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 24111da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 24121da177e4SLinus Torvalds 24131da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 24141da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 24151da177e4SLinus Torvalds 24161da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 24171da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 24181da177e4SLinus Torvalds * advertised window). 24191da177e4SLinus Torvalds */ 24209dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 24219dbc15f0SRobert P. J. Day transports) { 24221da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 24231da177e4SLinus Torvalds } 24241da177e4SLinus Torvalds 24251da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 24268e1ee18cSVlad Yasevich if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 24278e1ee18cSVlad Yasevich asoc->peer.i.initial_tsn, gfp)) 24288e1ee18cSVlad Yasevich goto clean_up; 24291da177e4SLinus Torvalds 24301da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 24311da177e4SLinus Torvalds * 24321da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 24331da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 24341da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 24351da177e4SLinus Torvalds * stream sequence number shall be set to 0. 24361da177e4SLinus Torvalds */ 24371da177e4SLinus Torvalds 2438ff356414SXin Long if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams, 2439ff356414SXin Long asoc->c.sinit_max_instreams, gfp)) 24401da177e4SLinus Torvalds goto clean_up; 24411da177e4SLinus Torvalds 24424135cce7SXin Long /* Update frag_point when stream_interleave may get changed. */ 24434135cce7SXin Long sctp_assoc_update_frag_point(asoc); 24444135cce7SXin Long 24457e062977SXin Long if (!asoc->temp && sctp_assoc_set_id(asoc, gfp)) 24461da177e4SLinus Torvalds goto clean_up; 24471da177e4SLinus Torvalds 24481da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 24491da177e4SLinus Torvalds * 24501da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 24511da177e4SLinus Torvalds * remote endpoint it should do the following: 24521da177e4SLinus Torvalds * ... 24531da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 24541da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 24551da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 24561da177e4SLinus Torvalds * association to the same value as the Initial TSN. 24571da177e4SLinus Torvalds */ 24581da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 24591da177e4SLinus Torvalds return 1; 24601da177e4SLinus Torvalds 24611da177e4SLinus Torvalds clean_up: 24621da177e4SLinus Torvalds /* Release the transport structures. */ 24631da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 24641da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2465add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2466add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 24671da177e4SLinus Torvalds } 24683f7a87d2SFrank Filz 24691da177e4SLinus Torvalds nomem: 24701da177e4SLinus Torvalds return 0; 24711da177e4SLinus Torvalds } 24721da177e4SLinus Torvalds 24731da177e4SLinus Torvalds 24741da177e4SLinus Torvalds /* Update asoc with the option described in param. 24751da177e4SLinus Torvalds * 24761da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 24771da177e4SLinus Torvalds * 24781da177e4SLinus Torvalds * asoc is the association to update. 24791da177e4SLinus Torvalds * param is the variable length parameter to use for update. 24801da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 24811da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 24821da177e4SLinus Torvalds * work we do. In particular, we should not build transport 24831da177e4SLinus Torvalds * structures for the addresses. 24841da177e4SLinus Torvalds */ 24851da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 24861da177e4SLinus Torvalds union sctp_params param, 24871da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2488dd0fc66fSAl Viro gfp_t gfp) 24891da177e4SLinus Torvalds { 2490327c0dabSXin Long struct sctp_endpoint *ep = asoc->ep; 2491d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 24924e7696d9SXin Long struct net *net = asoc->base.net; 2493d6de3097SVlad Yasevich struct sctp_transport *t; 2494327c0dabSXin Long enum sctp_scope scope; 2495327c0dabSXin Long union sctp_addr addr; 2496327c0dabSXin Long struct sctp_af *af; 2497327c0dabSXin Long int retval = 1, i; 2498327c0dabSXin Long u32 stale; 2499327c0dabSXin Long __u16 sat; 25001da177e4SLinus Torvalds 25011da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 25021da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 25031da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 25041da177e4SLinus Torvalds */ 25051da177e4SLinus Torvalds switch (param.p->type) { 25061da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25071da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 25081da177e4SLinus Torvalds break; 25097dab83deSVlad Yasevich goto do_addr_param; 25107dab83deSVlad Yasevich 25111da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25127dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 25137dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 25147dab83deSVlad Yasevich break; 25157dab83deSVlad Yasevich do_addr_param: 25161da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2517dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 25181da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2519e7ff4a70SEric W. Biederman if (sctp_in_scope(net, &addr, scope)) 2520dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 25211da177e4SLinus Torvalds return 0; 25221da177e4SLinus Torvalds break; 25231da177e4SLinus Torvalds 25241da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 2525e1fc3b14SEric W. Biederman if (!net->sctp.cookie_preserve_enable) 25261da177e4SLinus Torvalds break; 25271da177e4SLinus Torvalds 25281da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 25291da177e4SLinus Torvalds 25301da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 25311da177e4SLinus Torvalds * (1/1000sec). 25321da177e4SLinus Torvalds */ 253352db882fSDaniel Borkmann asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); 25341da177e4SLinus Torvalds break; 25351da177e4SLinus Torvalds 25361da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 2537bb33381dSDaniel Borkmann pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); 25381da177e4SLinus Torvalds break; 25391da177e4SLinus Torvalds 25401da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 25411da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 25421da177e4SLinus Torvalds * ones are really set by the peer. 25431da177e4SLinus Torvalds */ 25441da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 25451da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 25461da177e4SLinus Torvalds 2547140ee960SGui Jianfeng /* Assume that peer supports the address family 2548140ee960SGui Jianfeng * by which it sends a packet. 2549140ee960SGui Jianfeng */ 2550140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2551140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2552140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2553140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2554140ee960SGui Jianfeng 25551da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 25563c918704SXin Long sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 25571da177e4SLinus Torvalds if (sat) 25581da177e4SLinus Torvalds sat /= sizeof(__u16); 25591da177e4SLinus Torvalds 25601da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 25611da177e4SLinus Torvalds switch (param.sat->types[i]) { 25621da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25631da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 25641da177e4SLinus Torvalds break; 25651da177e4SLinus Torvalds 25661da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25676e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 25681da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 25691da177e4SLinus Torvalds break; 25701da177e4SLinus Torvalds 25711da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 25721da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 25731da177e4SLinus Torvalds break; 25741da177e4SLinus Torvalds 25751da177e4SLinus Torvalds default: /* Just ignore anything else. */ 25761da177e4SLinus Torvalds break; 25773ff50b79SStephen Hemminger } 25781da177e4SLinus Torvalds } 25791da177e4SLinus Torvalds break; 25801da177e4SLinus Torvalds 25811da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 25821da177e4SLinus Torvalds asoc->peer.cookie_len = 25833c918704SXin Long ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 2584ce950f10SNeil Horman kfree(asoc->peer.cookie); 25850a8dd9f6SNeil Horman asoc->peer.cookie = kmemdup(param.cookie->body, asoc->peer.cookie_len, gfp); 25860a8dd9f6SNeil Horman if (!asoc->peer.cookie) 25870a8dd9f6SNeil Horman retval = 0; 25881da177e4SLinus Torvalds break; 25891da177e4SLinus Torvalds 25901da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 25911da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 25921da177e4SLinus Torvalds break; 25931da177e4SLinus Torvalds 25941da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 25951da177e4SLinus Torvalds /* Rejected during verify stage. */ 25961da177e4SLinus Torvalds break; 25971da177e4SLinus Torvalds 25981da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 25991b0b8114SXin Long if (asoc->ep->ecn_enable) { 26001da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 26011da177e4SLinus Torvalds break; 26021b0b8114SXin Long } 26031b0b8114SXin Long /* Fall Through */ 26041b0b8114SXin Long goto fall_through; 26051b0b8114SXin Long 26061da177e4SLinus Torvalds 26070f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2608e69c4e0fSVlad Yasevich asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); 26091da177e4SLinus Torvalds break; 26101da177e4SLinus Torvalds 2611d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 26124e27428fSXin Long if (!ep->asconf_enable) 26130ef46e28SVlad Yasevich goto fall_through; 26140ef46e28SVlad Yasevich 26158b32f234SXin Long addr_param = param.v + sizeof(struct sctp_addip_param); 2616d6de3097SVlad Yasevich 2617cfbf654eSSaran Maruti Ramanara af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 2618e40607cbSDaniel Borkmann if (af == NULL) 2619e40607cbSDaniel Borkmann break; 2620e40607cbSDaniel Borkmann 2621d6de3097SVlad Yasevich af->from_addr_param(&addr, addr_param, 2622d6de3097SVlad Yasevich htons(asoc->peer.port), 0); 2623d6de3097SVlad Yasevich 2624d6de3097SVlad Yasevich /* if the address is invalid, we can't process it. 2625d6de3097SVlad Yasevich * XXX: see spec for what to do. 2626d6de3097SVlad Yasevich */ 2627d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2628d6de3097SVlad Yasevich break; 2629d6de3097SVlad Yasevich 2630d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2631d6de3097SVlad Yasevich if (!t) 2632d6de3097SVlad Yasevich break; 2633d6de3097SVlad Yasevich 2634d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2635d6de3097SVlad Yasevich break; 2636d6de3097SVlad Yasevich 2637131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2638131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2639131a47e3SVlad Yasevich break; 2640131a47e3SVlad Yasevich 26411da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 26421c134753SXin Long if (asoc->ep->prsctp_enable) { 26431da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 26441da177e4SLinus Torvalds break; 26451da177e4SLinus Torvalds } 26461da177e4SLinus Torvalds /* Fall Through */ 2647730fc3d0SVlad Yasevich goto fall_through; 2648730fc3d0SVlad Yasevich 2649730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2650b14878ccSVlad Yasevich if (!ep->auth_enable) 2651730fc3d0SVlad Yasevich goto fall_through; 2652730fc3d0SVlad Yasevich 2653730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2654ce950f10SNeil Horman kfree(asoc->peer.peer_random); 2655730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2656730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2657730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2658730fc3d0SVlad Yasevich retval = 0; 2659730fc3d0SVlad Yasevich break; 2660730fc3d0SVlad Yasevich } 2661730fc3d0SVlad Yasevich break; 2662730fc3d0SVlad Yasevich 2663730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2664b14878ccSVlad Yasevich if (!ep->auth_enable) 2665730fc3d0SVlad Yasevich goto fall_through; 2666730fc3d0SVlad Yasevich 2667730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2668ce950f10SNeil Horman kfree(asoc->peer.peer_hmacs); 2669730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2670730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2671730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2672730fc3d0SVlad Yasevich retval = 0; 2673730fc3d0SVlad Yasevich break; 2674730fc3d0SVlad Yasevich } 2675730fc3d0SVlad Yasevich 2676730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2677730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2678730fc3d0SVlad Yasevich break; 2679730fc3d0SVlad Yasevich 2680730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2681b14878ccSVlad Yasevich if (!ep->auth_enable) 2682730fc3d0SVlad Yasevich goto fall_through; 2683730fc3d0SVlad Yasevich 2684ce950f10SNeil Horman kfree(asoc->peer.peer_chunks); 2685730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2686730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2687730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2688730fc3d0SVlad Yasevich retval = 0; 2689730fc3d0SVlad Yasevich break; 2690730fc3d0SVlad Yasevich fall_through: 26911da177e4SLinus Torvalds default: 26921da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 26931da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 26941da177e4SLinus Torvalds * called prior to this routine. Simply log the error 26951da177e4SLinus Torvalds * here. 26961da177e4SLinus Torvalds */ 2697bb33381dSDaniel Borkmann pr_debug("%s: ignoring param:%d for association:%p.\n", 2698bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), asoc); 26991da177e4SLinus Torvalds break; 27003ff50b79SStephen Hemminger } 27011da177e4SLinus Torvalds 27021da177e4SLinus Torvalds return retval; 27031da177e4SLinus Torvalds } 27041da177e4SLinus Torvalds 27051da177e4SLinus Torvalds /* Select a new verification tag. */ 27061da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 27071da177e4SLinus Torvalds { 27081da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 27091da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 27101da177e4SLinus Torvalds */ 27111da177e4SLinus Torvalds __u32 x; 27121da177e4SLinus Torvalds 27131da177e4SLinus Torvalds do { 27141da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 27151da177e4SLinus Torvalds } while (x == 0); 27161da177e4SLinus Torvalds 27171da177e4SLinus Torvalds return x; 27181da177e4SLinus Torvalds } 27191da177e4SLinus Torvalds 27201da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 27211da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 27221da177e4SLinus Torvalds { 27231da177e4SLinus Torvalds __u32 retval; 27241da177e4SLinus Torvalds 27251da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 27261da177e4SLinus Torvalds return retval; 27271da177e4SLinus Torvalds } 27281da177e4SLinus Torvalds 27291da177e4SLinus Torvalds /* 27301da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 27311da177e4SLinus Torvalds * 0 1 2 3 27321da177e4SLinus 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 27331da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27341da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 27351da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27361da177e4SLinus Torvalds * | Serial Number | 27371da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27381da177e4SLinus Torvalds * | Address Parameter | 27391da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27401da177e4SLinus Torvalds * | ASCONF Parameter #1 | 27411da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27421da177e4SLinus Torvalds * \ \ 27431da177e4SLinus Torvalds * / .... / 27441da177e4SLinus Torvalds * \ \ 27451da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27461da177e4SLinus Torvalds * | ASCONF Parameter #N | 27471da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27481da177e4SLinus Torvalds * 27491da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 27501da177e4SLinus Torvalds */ 27511da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 27521da177e4SLinus Torvalds union sctp_addr *addr, 27531da177e4SLinus Torvalds int vparam_len) 27541da177e4SLinus Torvalds { 275565205cc4SXin Long struct sctp_addiphdr asconf; 27561da177e4SLinus Torvalds struct sctp_chunk *retval; 27571da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 27581da177e4SLinus Torvalds union sctp_addr_param addrparam; 27591da177e4SLinus Torvalds int addrlen; 27601da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 27611da177e4SLinus Torvalds 27621da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 27631da177e4SLinus Torvalds if (!addrlen) 27641da177e4SLinus Torvalds return NULL; 27651da177e4SLinus Torvalds length += addrlen; 27661da177e4SLinus Torvalds 27671da177e4SLinus Torvalds /* Create the chunk. */ 2768cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length, 2769cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 27701da177e4SLinus Torvalds if (!retval) 27711da177e4SLinus Torvalds return NULL; 27721da177e4SLinus Torvalds 27731da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 27741da177e4SLinus Torvalds 27751da177e4SLinus Torvalds retval->subh.addip_hdr = 27761da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 27771da177e4SLinus Torvalds retval->param_hdr.v = 27781da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 27791da177e4SLinus Torvalds 27801da177e4SLinus Torvalds return retval; 27811da177e4SLinus Torvalds } 27821da177e4SLinus Torvalds 27831da177e4SLinus Torvalds /* ADDIP 27841da177e4SLinus Torvalds * 3.2.1 Add IP Address 27851da177e4SLinus Torvalds * 0 1 2 3 27861da177e4SLinus 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 27871da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27881da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 27891da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27901da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27911da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27921da177e4SLinus Torvalds * | Address Parameter | 27931da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27941da177e4SLinus Torvalds * 27951da177e4SLinus Torvalds * 3.2.2 Delete IP Address 27961da177e4SLinus Torvalds * 0 1 2 3 27971da177e4SLinus 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 27981da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27991da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 28001da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28011da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28021da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28031da177e4SLinus Torvalds * | Address Parameter | 28041da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28051da177e4SLinus Torvalds * 28061da177e4SLinus Torvalds */ 28071da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 28081da177e4SLinus Torvalds union sctp_addr *laddr, 28091da177e4SLinus Torvalds struct sockaddr *addrs, 2810327c0dabSXin Long int addrcnt, __be16 flags) 28111da177e4SLinus Torvalds { 28121da177e4SLinus Torvalds union sctp_addr_param addr_param; 2813327c0dabSXin Long struct sctp_addip_param param; 28141da177e4SLinus Torvalds int paramlen = sizeof(param); 2815327c0dabSXin Long struct sctp_chunk *retval; 28161da177e4SLinus Torvalds int addr_param_len = 0; 2817327c0dabSXin Long union sctp_addr *addr; 2818327c0dabSXin Long int totallen = 0, i; 28198a07eb0aSMichio Honda int del_pickup = 0; 2820327c0dabSXin Long struct sctp_af *af; 2821327c0dabSXin Long void *addr_buf; 28221da177e4SLinus Torvalds 28231da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 28241da177e4SLinus Torvalds addr_buf = addrs; 28251da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2826ea110733SJoe Perches addr = addr_buf; 28271da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28281da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28291da177e4SLinus Torvalds 28301da177e4SLinus Torvalds totallen += paramlen; 28311da177e4SLinus Torvalds totallen += addr_param_len; 28321da177e4SLinus Torvalds 28331da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28348a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending && !del_pickup) { 28358a07eb0aSMichio Honda /* reuse the parameter length from the same scope one */ 28368a07eb0aSMichio Honda totallen += paramlen; 28378a07eb0aSMichio Honda totallen += addr_param_len; 28388a07eb0aSMichio Honda del_pickup = 1; 2839bb33381dSDaniel Borkmann 2840bb33381dSDaniel Borkmann pr_debug("%s: picked same-scope del_pending addr, " 2841bb33381dSDaniel Borkmann "totallen for all addresses is %d\n", 2842bb33381dSDaniel Borkmann __func__, totallen); 28438a07eb0aSMichio Honda } 28441da177e4SLinus Torvalds } 28451da177e4SLinus Torvalds 28461da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 28471da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 28481da177e4SLinus Torvalds if (!retval) 28491da177e4SLinus Torvalds return NULL; 28501da177e4SLinus Torvalds 28511da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 28521da177e4SLinus Torvalds addr_buf = addrs; 28531da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2854ea110733SJoe Perches addr = addr_buf; 28551da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28561da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28571da177e4SLinus Torvalds param.param_hdr.type = flags; 28581da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 2859978aa047SXin Long param.crr_id = htonl(i); 28601da177e4SLinus Torvalds 28611da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 28621da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 28631da177e4SLinus Torvalds 28641da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28651da177e4SLinus Torvalds } 28668a07eb0aSMichio Honda if (flags == SCTP_PARAM_ADD_IP && del_pickup) { 28678a07eb0aSMichio Honda addr = asoc->asconf_addr_del_pending; 28688a07eb0aSMichio Honda af = sctp_get_af_specific(addr->v4.sin_family); 28698a07eb0aSMichio Honda addr_param_len = af->to_addr_param(addr, &addr_param); 28708a07eb0aSMichio Honda param.param_hdr.type = SCTP_PARAM_DEL_IP; 28718a07eb0aSMichio Honda param.param_hdr.length = htons(paramlen + addr_param_len); 2872978aa047SXin Long param.crr_id = htonl(i); 28738a07eb0aSMichio Honda 28748a07eb0aSMichio Honda sctp_addto_chunk(retval, paramlen, ¶m); 28758a07eb0aSMichio Honda sctp_addto_chunk(retval, addr_param_len, &addr_param); 28768a07eb0aSMichio Honda } 28771da177e4SLinus Torvalds return retval; 28781da177e4SLinus Torvalds } 28791da177e4SLinus Torvalds 28801da177e4SLinus Torvalds /* ADDIP 28811da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 28821da177e4SLinus Torvalds * 0 1 2 3 28831da177e4SLinus 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 28841da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28851da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 28861da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28871da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28881da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28891da177e4SLinus Torvalds * | Address Parameter | 28901da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28911da177e4SLinus Torvalds * 28921da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 28931da177e4SLinus Torvalds */ 28941da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 28951da177e4SLinus Torvalds union sctp_addr *addr) 28961da177e4SLinus Torvalds { 2897327c0dabSXin Long struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 2898327c0dabSXin Long union sctp_addr_param addrparam; 28998b32f234SXin Long struct sctp_addip_param param; 29001da177e4SLinus Torvalds struct sctp_chunk *retval; 29011da177e4SLinus Torvalds int len = sizeof(param); 29021da177e4SLinus Torvalds int addrlen; 29031da177e4SLinus Torvalds 29041da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 29051da177e4SLinus Torvalds if (!addrlen) 29061da177e4SLinus Torvalds return NULL; 29071da177e4SLinus Torvalds len += addrlen; 29081da177e4SLinus Torvalds 29091da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 29101da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 29111da177e4SLinus Torvalds if (!retval) 29121da177e4SLinus Torvalds return NULL; 29131da177e4SLinus Torvalds 29141da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 29151da177e4SLinus Torvalds param.param_hdr.length = htons(len); 29161da177e4SLinus Torvalds param.crr_id = 0; 29171da177e4SLinus Torvalds 29181da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 29191da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 29201da177e4SLinus Torvalds 29211da177e4SLinus Torvalds return retval; 29221da177e4SLinus Torvalds } 29231da177e4SLinus Torvalds 29241da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 29251da177e4SLinus Torvalds * 0 1 2 3 29261da177e4SLinus 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 29271da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29281da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 29291da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29301da177e4SLinus Torvalds * | Serial Number | 29311da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29321da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 29331da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29341da177e4SLinus Torvalds * \ \ 29351da177e4SLinus Torvalds * / .... / 29361da177e4SLinus Torvalds * \ \ 29371da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29381da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 29391da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29401da177e4SLinus Torvalds * 29411da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 29421da177e4SLinus Torvalds */ 29431da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 29441da177e4SLinus Torvalds __u32 serial, int vparam_len) 29451da177e4SLinus Torvalds { 294665205cc4SXin Long struct sctp_addiphdr asconf; 29471da177e4SLinus Torvalds struct sctp_chunk *retval; 29481da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 29491da177e4SLinus Torvalds 29501da177e4SLinus Torvalds /* Create the chunk. */ 2951cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length, 2952cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 29531da177e4SLinus Torvalds if (!retval) 29541da177e4SLinus Torvalds return NULL; 29551da177e4SLinus Torvalds 29561da177e4SLinus Torvalds asconf.serial = htonl(serial); 29571da177e4SLinus Torvalds 29581da177e4SLinus Torvalds retval->subh.addip_hdr = 29591da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 29601da177e4SLinus Torvalds 29611da177e4SLinus Torvalds return retval; 29621da177e4SLinus Torvalds } 29631da177e4SLinus Torvalds 29641da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 29659f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 29668b32f234SXin Long __be16 err_code, 29678b32f234SXin Long struct sctp_addip_param *asconf_param) 29681da177e4SLinus Torvalds { 29698b32f234SXin Long struct sctp_addip_param ack_param; 2970d8238d9dSXin Long struct sctp_errhdr err_param; 29711da177e4SLinus Torvalds int asconf_param_len = 0; 29721da177e4SLinus Torvalds int err_param_len = 0; 2973dbc16db1SAl Viro __be16 response_type; 29741da177e4SLinus Torvalds 29751da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 29761da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 29771da177e4SLinus Torvalds } else { 29781da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 29791da177e4SLinus Torvalds err_param_len = sizeof(err_param); 29801da177e4SLinus Torvalds if (asconf_param) 29811da177e4SLinus Torvalds asconf_param_len = 29821da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 29831da177e4SLinus Torvalds } 29841da177e4SLinus Torvalds 29851da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 29861da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 29871da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 29881da177e4SLinus Torvalds err_param_len + 29891da177e4SLinus Torvalds asconf_param_len); 29901da177e4SLinus Torvalds ack_param.crr_id = crr_id; 29911da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 29921da177e4SLinus Torvalds 29931da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 29941da177e4SLinus Torvalds return; 29951da177e4SLinus Torvalds 29961da177e4SLinus Torvalds /* Add Error Cause parameter. */ 29971da177e4SLinus Torvalds err_param.cause = err_code; 29981da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 29991da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 30001da177e4SLinus Torvalds 30011da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 30021da177e4SLinus Torvalds if (asconf_param) 30031da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 30041da177e4SLinus Torvalds } 30051da177e4SLinus Torvalds 30061da177e4SLinus Torvalds /* Process a asconf parameter. */ 3007dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 30081da177e4SLinus Torvalds struct sctp_chunk *asconf, 30098b32f234SXin Long struct sctp_addip_param *asconf_param) 30101da177e4SLinus Torvalds { 30111da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3012327c0dabSXin Long struct sctp_transport *peer; 3013327c0dabSXin Long union sctp_addr addr; 3014327c0dabSXin Long struct sctp_af *af; 30151da177e4SLinus Torvalds 30168b32f234SXin Long addr_param = (void *)asconf_param + sizeof(*asconf_param); 3017c1cc678aSPatrick McHardy 301844e65c1eSWei Yongjun if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && 301944e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && 302044e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) 302144e65c1eSWei Yongjun return SCTP_ERROR_UNKNOWN_PARAM; 302244e65c1eSWei Yongjun 30236a435732SShan Wei switch (addr_param->p.type) { 3024c4492586SWei Yongjun case SCTP_PARAM_IPV6_ADDRESS: 3025c4492586SWei Yongjun if (!asoc->peer.ipv6_address) 3026945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3027c4492586SWei Yongjun break; 3028c4492586SWei Yongjun case SCTP_PARAM_IPV4_ADDRESS: 3029c4492586SWei Yongjun if (!asoc->peer.ipv4_address) 3030945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3031c4492586SWei Yongjun break; 3032c4492586SWei Yongjun default: 3033945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3034c4492586SWei Yongjun } 3035c4492586SWei Yongjun 30366a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 30371da177e4SLinus Torvalds if (unlikely(!af)) 3038945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 30391da177e4SLinus Torvalds 3040dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); 304142e30bf3SVlad Yasevich 304242e30bf3SVlad Yasevich /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast 304342e30bf3SVlad Yasevich * or multicast address. 304442e30bf3SVlad Yasevich * (note: wildcard is permitted and requires special handling so 304542e30bf3SVlad Yasevich * make sure we check for that) 304642e30bf3SVlad Yasevich */ 304742e30bf3SVlad Yasevich if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) 3048945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 304942e30bf3SVlad Yasevich 30501da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 30511da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 305242e30bf3SVlad Yasevich /* Section 4.2.1: 305342e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the source 305442e30bf3SVlad Yasevich * address of the packet MUST be added. 305542e30bf3SVlad Yasevich */ 305642e30bf3SVlad Yasevich if (af->is_any(&addr)) 305742e30bf3SVlad Yasevich memcpy(&addr, &asconf->source, sizeof(addr)); 305842e30bf3SVlad Yasevich 30592277c7cdSRichard Haines if (security_sctp_bind_connect(asoc->ep->base.sk, 30602277c7cdSRichard Haines SCTP_PARAM_ADD_IP, 30612277c7cdSRichard Haines (struct sockaddr *)&addr, 30622277c7cdSRichard Haines af->sockaddr_len)) 30632277c7cdSRichard Haines return SCTP_ERROR_REQ_REFUSED; 30642277c7cdSRichard Haines 30651da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 30661da177e4SLinus Torvalds * request and does not have the local resources to add this 30671da177e4SLinus Torvalds * new address to the association, it MUST return an Error 30681da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 30691da177e4SLinus Torvalds * Due to Resource Shortage'. 30701da177e4SLinus Torvalds */ 30711da177e4SLinus Torvalds 3072dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 30731da177e4SLinus Torvalds if (!peer) 30741da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 30751da177e4SLinus Torvalds 30761da177e4SLinus Torvalds /* Start the heartbeat timer. */ 3077ba6f5e33SMarcelo Ricardo Leitner sctp_transport_reset_hb_timer(peer); 30786af29cccSMichio Honda asoc->new_transport = peer; 30791da177e4SLinus Torvalds break; 30801da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 30811da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 30821da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 30831da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 30841da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 30851da177e4SLinus Torvalds */ 308642e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 30871da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 30881da177e4SLinus Torvalds 30891da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 30901da177e4SLinus Torvalds * address which is also the source address of the IP packet 30911da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 30921da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 30931da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 30941da177e4SLinus Torvalds * Delete Source IP Address' 30951da177e4SLinus Torvalds */ 3096b1364104SMichio Honda if (sctp_cmp_addr_exact(&asconf->source, &addr)) 30971da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 30981da177e4SLinus Torvalds 309942e30bf3SVlad Yasevich /* Section 4.2.2 310042e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 310142e30bf3SVlad Yasevich * addresses of the peer except the source address of the 310242e30bf3SVlad Yasevich * packet MUST be deleted. 310342e30bf3SVlad Yasevich */ 310442e30bf3SVlad Yasevich if (af->is_any(&addr)) { 310542e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 310642e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 310742e30bf3SVlad Yasevich asconf->transport); 31087c5a9461Slucien return SCTP_ERROR_NO_ERROR; 31097c5a9461Slucien } 31107c5a9461Slucien 31117c5a9461Slucien /* If the address is not part of the association, the 31127c5a9461Slucien * ASCONF-ACK with Error Cause Indication Parameter 31137c5a9461Slucien * which including cause of Unresolvable Address should 31147c5a9461Slucien * be sent. 31157c5a9461Slucien */ 31167c5a9461Slucien peer = sctp_assoc_lookup_paddr(asoc, &addr); 31177c5a9461Slucien if (!peer) 31187c5a9461Slucien return SCTP_ERROR_DNS_FAILED; 31197c5a9461Slucien 31207c5a9461Slucien sctp_assoc_rm_peer(asoc, peer); 31211da177e4SLinus Torvalds break; 31221da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 312342e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 312442e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 312542e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 312642e30bf3SVlad Yasevich * primary. 312742e30bf3SVlad Yasevich */ 312842e30bf3SVlad Yasevich if (af->is_any(&addr)) 312942e30bf3SVlad Yasevich memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); 313042e30bf3SVlad Yasevich 31312277c7cdSRichard Haines if (security_sctp_bind_connect(asoc->ep->base.sk, 31322277c7cdSRichard Haines SCTP_PARAM_SET_PRIMARY, 31332277c7cdSRichard Haines (struct sockaddr *)&addr, 31342277c7cdSRichard Haines af->sockaddr_len)) 31352277c7cdSRichard Haines return SCTP_ERROR_REQ_REFUSED; 31362277c7cdSRichard Haines 3137dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 31381da177e4SLinus Torvalds if (!peer) 3139945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 31401da177e4SLinus Torvalds 31411da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 31421da177e4SLinus Torvalds break; 31431da177e4SLinus Torvalds } 31441da177e4SLinus Torvalds 31451da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 31461da177e4SLinus Torvalds } 31471da177e4SLinus Torvalds 31486f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 31499de7922bSDaniel Borkmann bool sctp_verify_asconf(const struct sctp_association *asoc, 31509de7922bSDaniel Borkmann struct sctp_chunk *chunk, bool addr_param_needed, 31519de7922bSDaniel Borkmann struct sctp_paramhdr **errp) 31529de7922bSDaniel Borkmann { 315368d75469SXin Long struct sctp_addip_chunk *addip; 31549de7922bSDaniel Borkmann bool addr_param_seen = false; 3155327c0dabSXin Long union sctp_params param; 31566f4c618dSWei Yongjun 315768d75469SXin Long addip = (struct sctp_addip_chunk *)chunk->chunk_hdr; 31589de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 31599de7922bSDaniel Borkmann size_t length = ntohs(param.p->length); 31609de7922bSDaniel Borkmann 31616f4c618dSWei Yongjun *errp = param.p; 31626f4c618dSWei Yongjun switch (param.p->type) { 31639de7922bSDaniel Borkmann case SCTP_PARAM_ERR_CAUSE: 31649de7922bSDaniel Borkmann break; 31659de7922bSDaniel Borkmann case SCTP_PARAM_IPV4_ADDRESS: 3166a38905e6SXin Long if (length != sizeof(struct sctp_ipv4addr_param)) 31679de7922bSDaniel Borkmann return false; 3168ce7b4cccSlucien /* ensure there is only one addr param and it's in the 3169ce7b4cccSlucien * beginning of addip_hdr params, or we reject it. 3170ce7b4cccSlucien */ 3171ce7b4cccSlucien if (param.v != addip->addip_hdr.params) 3172ce7b4cccSlucien return false; 31739de7922bSDaniel Borkmann addr_param_seen = true; 31749de7922bSDaniel Borkmann break; 31759de7922bSDaniel Borkmann case SCTP_PARAM_IPV6_ADDRESS: 317600987cc0SXin Long if (length != sizeof(struct sctp_ipv6addr_param)) 31779de7922bSDaniel Borkmann return false; 3178ce7b4cccSlucien if (param.v != addip->addip_hdr.params) 3179ce7b4cccSlucien return false; 31809de7922bSDaniel Borkmann addr_param_seen = true; 31819de7922bSDaniel Borkmann break; 31826f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 31836f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 31846f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 31859de7922bSDaniel Borkmann /* In ASCONF chunks, these need to be first. */ 31869de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 31879de7922bSDaniel Borkmann return false; 31889de7922bSDaniel Borkmann length = ntohs(param.addip->param_hdr.length); 31898b32f234SXin Long if (length < sizeof(struct sctp_addip_param) + 31903c918704SXin Long sizeof(**errp)) 31919de7922bSDaniel Borkmann return false; 31926f4c618dSWei Yongjun break; 31936f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 31946f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 31958b32f234SXin Long if (length != sizeof(struct sctp_addip_param)) 31969de7922bSDaniel Borkmann return false; 31976f4c618dSWei Yongjun break; 31986f4c618dSWei Yongjun default: 31999de7922bSDaniel Borkmann /* This is unkown to us, reject! */ 32009de7922bSDaniel Borkmann return false; 32019de7922bSDaniel Borkmann } 32026f4c618dSWei Yongjun } 32036f4c618dSWei Yongjun 32049de7922bSDaniel Borkmann /* Remaining sanity checks. */ 32059de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 32069de7922bSDaniel Borkmann return false; 32079de7922bSDaniel Borkmann if (!addr_param_needed && addr_param_seen) 32089de7922bSDaniel Borkmann return false; 32099de7922bSDaniel Borkmann if (param.v != chunk->chunk_end) 32109de7922bSDaniel Borkmann return false; 32116f4c618dSWei Yongjun 32129de7922bSDaniel Borkmann return true; 32136f4c618dSWei Yongjun } 32146f4c618dSWei Yongjun 32151da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 32161da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 32171da177e4SLinus Torvalds */ 32181da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 32191da177e4SLinus Torvalds struct sctp_chunk *asconf) 32201da177e4SLinus Torvalds { 32211da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3222327c0dabSXin Long struct sctp_addip_chunk *addip; 32231da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 3224327c0dabSXin Long bool all_param_pass = true; 3225327c0dabSXin Long struct sctp_addiphdr *hdr; 3226327c0dabSXin Long int length = 0, chunk_len; 3227327c0dabSXin Long union sctp_params param; 3228dbc16db1SAl Viro __be16 err_code; 32291da177e4SLinus Torvalds __u32 serial; 32301da177e4SLinus Torvalds 323168d75469SXin Long addip = (struct sctp_addip_chunk *)asconf->chunk_hdr; 3232922dbc5bSXin Long chunk_len = ntohs(asconf->chunk_hdr->length) - 3233922dbc5bSXin Long sizeof(struct sctp_chunkhdr); 323465205cc4SXin Long hdr = (struct sctp_addiphdr *)asconf->skb->data; 32351da177e4SLinus Torvalds serial = ntohl(hdr->serial); 32361da177e4SLinus Torvalds 32371da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 323865205cc4SXin Long length = sizeof(*hdr); 32391da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 32401da177e4SLinus Torvalds chunk_len -= length; 32411da177e4SLinus Torvalds 32421da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 32437aa1b54bSJoe Perches * asconf parameter. 32441da177e4SLinus Torvalds */ 32456a435732SShan Wei length = ntohs(addr_param->p.length); 32461da177e4SLinus Torvalds chunk_len -= length; 32471da177e4SLinus Torvalds 32481da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 32491da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 32502cab86beSWei Yongjun * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF 32517aa1b54bSJoe Perches * parameters. 32521da177e4SLinus Torvalds */ 32532cab86beSWei Yongjun asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); 32541da177e4SLinus Torvalds if (!asconf_ack) 32551da177e4SLinus Torvalds goto done; 32561da177e4SLinus Torvalds 32571da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 32589de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 32599de7922bSDaniel Borkmann /* Skip preceeding address parameters. */ 32609de7922bSDaniel Borkmann if (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 32619de7922bSDaniel Borkmann param.p->type == SCTP_PARAM_IPV6_ADDRESS) 32629de7922bSDaniel Borkmann continue; 32639de7922bSDaniel Borkmann 32641da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 32659de7922bSDaniel Borkmann param.addip); 32661da177e4SLinus Torvalds /* ADDIP 4.1 A7) 32671da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 32681da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 32691da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 32701da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 32711da177e4SLinus Torvalds * a specific success indication is present for the parameter. 32721da177e4SLinus Torvalds */ 32739de7922bSDaniel Borkmann if (err_code != SCTP_ERROR_NO_ERROR) 32749de7922bSDaniel Borkmann all_param_pass = false; 32751da177e4SLinus Torvalds if (!all_param_pass) 32769de7922bSDaniel Borkmann sctp_add_asconf_response(asconf_ack, param.addip->crr_id, 32779de7922bSDaniel Borkmann err_code, param.addip); 32781da177e4SLinus Torvalds 32791da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 32801da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 32811da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 32821da177e4SLinus Torvalds * in the ASCONF. 32831da177e4SLinus Torvalds */ 32849de7922bSDaniel Borkmann if (err_code == SCTP_ERROR_RSRC_LOW) 32851da177e4SLinus Torvalds goto done; 32861da177e4SLinus Torvalds } 32871da177e4SLinus Torvalds done: 32881da177e4SLinus Torvalds asoc->peer.addip_serial++; 32891da177e4SLinus Torvalds 32901da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 32911da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 32921da177e4SLinus Torvalds */ 32931da177e4SLinus Torvalds if (asconf_ack) { 32941da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3295a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3296a08de64dSVlad Yasevich &asoc->asconf_ack_list); 32971da177e4SLinus Torvalds } 32981da177e4SLinus Torvalds 32991da177e4SLinus Torvalds return asconf_ack; 33001da177e4SLinus Torvalds } 33011da177e4SLinus Torvalds 33021da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 3303425e0f68SWei Yongjun static void sctp_asconf_param_success(struct sctp_association *asoc, 33048b32f234SXin Long struct sctp_addip_param *asconf_param) 33051da177e4SLinus Torvalds { 33061da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 33071da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3308dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 3309327c0dabSXin Long struct sctp_transport *transport; 3310327c0dabSXin Long union sctp_addr addr; 3311327c0dabSXin Long struct sctp_af *af; 33121da177e4SLinus Torvalds 33138b32f234SXin Long addr_param = (void *)asconf_param + sizeof(*asconf_param); 33141da177e4SLinus Torvalds 33151da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 33166a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 3317dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 33181da177e4SLinus Torvalds 33191da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 33201da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3321559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3322559cf710SVlad Yasevich * held, so the list can not change. 3323559cf710SVlad Yasevich */ 33240ed90fb0SVlad Yasevich local_bh_disable(); 3325559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3326dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3327f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3328dc022a98SSridhar Samudrala } 33290ed90fb0SVlad Yasevich local_bh_enable(); 33303cd9749cSWei Yongjun list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33313cd9749cSWei Yongjun transports) { 3332c86a773cSJulian Anastasov sctp_transport_dst_release(transport); 33333cd9749cSWei Yongjun } 33341da177e4SLinus Torvalds break; 33351da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 33360ed90fb0SVlad Yasevich local_bh_disable(); 3337425e0f68SWei Yongjun sctp_del_bind_addr(bp, &addr); 33388a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending != NULL && 33398a07eb0aSMichio Honda sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { 33408a07eb0aSMichio Honda kfree(asoc->asconf_addr_del_pending); 33418a07eb0aSMichio Honda asoc->asconf_addr_del_pending = NULL; 33428a07eb0aSMichio Honda } 33430ed90fb0SVlad Yasevich local_bh_enable(); 33449dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33459dbc15f0SRobert P. J. Day transports) { 3346c86a773cSJulian Anastasov sctp_transport_dst_release(transport); 33471da177e4SLinus Torvalds } 33481da177e4SLinus Torvalds break; 33491da177e4SLinus Torvalds default: 33501da177e4SLinus Torvalds break; 33511da177e4SLinus Torvalds } 33521da177e4SLinus Torvalds } 33531da177e4SLinus Torvalds 33541da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 33551da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 33561da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 33571da177e4SLinus Torvalds * ADDIP 4.1 33581da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 33591da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 33601da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 33611da177e4SLinus Torvalds * specific success indication is present for the parameter. 33621da177e4SLinus Torvalds */ 3363dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 33648b32f234SXin Long struct sctp_addip_param *asconf_param, 33651da177e4SLinus Torvalds int no_err) 33661da177e4SLinus Torvalds { 33678b32f234SXin Long struct sctp_addip_param *asconf_ack_param; 3368d8238d9dSXin Long struct sctp_errhdr *err_param; 3369f3830cccSWei Yongjun int asconf_ack_len; 3370dbc16db1SAl Viro __be16 err_code; 3371327c0dabSXin Long int length; 33721da177e4SLinus Torvalds 33731da177e4SLinus Torvalds if (no_err) 33741da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 33751da177e4SLinus Torvalds else 33761da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 33771da177e4SLinus Torvalds 3378f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3379922dbc5bSXin Long sizeof(struct sctp_chunkhdr); 3380f3830cccSWei Yongjun 33811da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 33821da177e4SLinus Torvalds * the first asconf_ack parameter. 33831da177e4SLinus Torvalds */ 338465205cc4SXin Long length = sizeof(struct sctp_addiphdr); 33858b32f234SXin Long asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data + 33861da177e4SLinus Torvalds length); 33871da177e4SLinus Torvalds asconf_ack_len -= length; 33881da177e4SLinus Torvalds 33891da177e4SLinus Torvalds while (asconf_ack_len > 0) { 33901da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 33911da177e4SLinus Torvalds switch (asconf_ack_param->param_hdr.type) { 33921da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 33931da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 33941da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 33958b32f234SXin Long length = sizeof(*asconf_ack_param); 3396ea110733SJoe Perches err_param = (void *)asconf_ack_param + length; 33971da177e4SLinus Torvalds asconf_ack_len -= length; 33981da177e4SLinus Torvalds if (asconf_ack_len > 0) 33991da177e4SLinus Torvalds return err_param->cause; 34001da177e4SLinus Torvalds else 34011da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 34021da177e4SLinus Torvalds break; 34031da177e4SLinus Torvalds default: 34041da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 34051da177e4SLinus Torvalds } 34061da177e4SLinus Torvalds } 34071da177e4SLinus Torvalds 34081da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 3409ea110733SJoe Perches asconf_ack_param = (void *)asconf_ack_param + length; 34101da177e4SLinus Torvalds asconf_ack_len -= length; 34111da177e4SLinus Torvalds } 34121da177e4SLinus Torvalds 34131da177e4SLinus Torvalds return err_code; 34141da177e4SLinus Torvalds } 34151da177e4SLinus Torvalds 34161da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 34171da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 34181da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 34191da177e4SLinus Torvalds { 34201da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 34218b32f234SXin Long struct sctp_addip_param *asconf_param; 3422327c0dabSXin Long __be16 err_code = SCTP_ERROR_NO_ERROR; 3423327c0dabSXin Long union sctp_addr_param *addr_param; 34241da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 34251da177e4SLinus Torvalds int all_param_pass = 0; 3426327c0dabSXin Long int length = 0; 34271da177e4SLinus Torvalds int no_err = 1; 34281da177e4SLinus Torvalds int retval = 0; 34291da177e4SLinus Torvalds 34301da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 34311da177e4SLinus Torvalds * a pointer to address parameter. 34321da177e4SLinus Torvalds */ 343368d75469SXin Long length = sizeof(struct sctp_addip_chunk); 34341da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 34351da177e4SLinus Torvalds asconf_len -= length; 34361da177e4SLinus Torvalds 34371da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 34387aa1b54bSJoe Perches * pointer to the first asconf parameter. 34391da177e4SLinus Torvalds */ 34406a435732SShan Wei length = ntohs(addr_param->p.length); 3441ea110733SJoe Perches asconf_param = (void *)addr_param + length; 34421da177e4SLinus Torvalds asconf_len -= length; 34431da177e4SLinus Torvalds 34441da177e4SLinus Torvalds /* ADDIP 4.1 34451da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 34461da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 34471da177e4SLinus Torvalds * successful. 34481da177e4SLinus Torvalds */ 344965205cc4SXin Long if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr)) 34501da177e4SLinus Torvalds all_param_pass = 1; 34511da177e4SLinus Torvalds 34521da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 34531da177e4SLinus Torvalds while (asconf_len > 0) { 34541da177e4SLinus Torvalds if (all_param_pass) 34551da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 34561da177e4SLinus Torvalds else { 34571da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 34581da177e4SLinus Torvalds asconf_param, 34591da177e4SLinus Torvalds no_err); 34601da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 34611da177e4SLinus Torvalds no_err = 0; 34621da177e4SLinus Torvalds } 34631da177e4SLinus Torvalds 34641da177e4SLinus Torvalds switch (err_code) { 34651da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 3466425e0f68SWei Yongjun sctp_asconf_param_success(asoc, asconf_param); 34671da177e4SLinus Torvalds break; 34681da177e4SLinus Torvalds 34691da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 34701da177e4SLinus Torvalds retval = 1; 34711da177e4SLinus Torvalds break; 34721da177e4SLinus Torvalds 3473a987f762SWei Yongjun case SCTP_ERROR_UNKNOWN_PARAM: 34741da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 34751da177e4SLinus Torvalds * future. 34761da177e4SLinus Torvalds */ 34771da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 34781da177e4SLinus Torvalds asconf_param->param_hdr.type; 34791da177e4SLinus Torvalds break; 34801da177e4SLinus Torvalds 34811da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 34821da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 34831da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 34841da177e4SLinus Torvalds default: 34851da177e4SLinus Torvalds break; 34861da177e4SLinus Torvalds } 34871da177e4SLinus Torvalds 34881da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 34891da177e4SLinus Torvalds * one. 34901da177e4SLinus Torvalds */ 34911da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3492ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 34931da177e4SLinus Torvalds asconf_len -= length; 34941da177e4SLinus Torvalds } 34951da177e4SLinus Torvalds 3496ddc4bbeeSMichio Honda if (no_err && asoc->src_out_of_asoc_ok) { 34978a07eb0aSMichio Honda asoc->src_out_of_asoc_ok = 0; 3498ddc4bbeeSMichio Honda sctp_transport_immediate_rtx(asoc->peer.primary_path); 3499ddc4bbeeSMichio Honda } 35008a07eb0aSMichio Honda 35011da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 35025f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 35031da177e4SLinus Torvalds sctp_chunk_free(asconf); 35041da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 35051da177e4SLinus Torvalds 35061da177e4SLinus Torvalds return retval; 35071da177e4SLinus Torvalds } 35081da177e4SLinus Torvalds 35091da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 35101da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 35111da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 35121da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 35131da177e4SLinus Torvalds { 35141da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 35151da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 35161da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 35171da177e4SLinus Torvalds size_t hint; 35181da177e4SLinus Torvalds int i; 35191da177e4SLinus Torvalds 35201da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 35211da177e4SLinus Torvalds 3522cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC); 35231da177e4SLinus Torvalds 35241da177e4SLinus Torvalds if (!retval) 35251da177e4SLinus Torvalds return NULL; 35261da177e4SLinus Torvalds 35271da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 35281da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 35291da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 35301da177e4SLinus Torvalds 35311da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 35321da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 35331da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 35341da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 35351da177e4SLinus Torvalds } 35361da177e4SLinus Torvalds 35371da177e4SLinus Torvalds return retval; 35381da177e4SLinus Torvalds } 3539cc16f00fSXin Long 35402d07a49aSXin Long struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc, 35412d07a49aSXin Long __u32 new_cum_tsn, size_t nstreams, 35422d07a49aSXin Long struct sctp_ifwdtsn_skip *skiplist) 35432d07a49aSXin Long { 35442d07a49aSXin Long struct sctp_chunk *retval = NULL; 35452d07a49aSXin Long struct sctp_ifwdtsn_hdr ftsn_hdr; 35462d07a49aSXin Long size_t hint; 35472d07a49aSXin Long 35482d07a49aSXin Long hint = (nstreams + 1) * sizeof(__u32); 35492d07a49aSXin Long 35502d07a49aSXin Long retval = sctp_make_control(asoc, SCTP_CID_I_FWD_TSN, 0, hint, 35512d07a49aSXin Long GFP_ATOMIC); 35522d07a49aSXin Long if (!retval) 35532d07a49aSXin Long return NULL; 35542d07a49aSXin Long 35552d07a49aSXin Long ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 35562d07a49aSXin Long retval->subh.ifwdtsn_hdr = 35572d07a49aSXin Long sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 35582d07a49aSXin Long 35592d07a49aSXin Long sctp_addto_chunk(retval, nstreams * sizeof(skiplist[0]), skiplist); 35602d07a49aSXin Long 35612d07a49aSXin Long return retval; 35622d07a49aSXin Long } 35632d07a49aSXin Long 3564cc16f00fSXin Long /* RE-CONFIG 3.1 (RE-CONFIG chunk) 3565cc16f00fSXin Long * 0 1 2 3 3566cc16f00fSXin 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 3567cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3568cc16f00fSXin Long * | Type = 130 | Chunk Flags | Chunk Length | 3569cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3570cc16f00fSXin Long * \ \ 3571cc16f00fSXin Long * / Re-configuration Parameter / 3572cc16f00fSXin Long * \ \ 3573cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3574cc16f00fSXin Long * \ \ 3575cc16f00fSXin Long * / Re-configuration Parameter (optional) / 3576cc16f00fSXin Long * \ \ 3577cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3578cc16f00fSXin Long */ 3579327c0dabSXin Long static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc, 3580cc16f00fSXin Long int length) 3581cc16f00fSXin Long { 3582cc16f00fSXin Long struct sctp_reconf_chunk *reconf; 3583cc16f00fSXin Long struct sctp_chunk *retval; 3584cc16f00fSXin Long 3585cc16f00fSXin Long retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length, 3586cc16f00fSXin Long GFP_ATOMIC); 3587cc16f00fSXin Long if (!retval) 3588cc16f00fSXin Long return NULL; 3589cc16f00fSXin Long 3590cc16f00fSXin Long reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr; 3591cc16f00fSXin Long retval->param_hdr.v = reconf->params; 3592cc16f00fSXin Long 3593cc16f00fSXin Long return retval; 3594cc16f00fSXin Long } 3595cc16f00fSXin Long 3596cc16f00fSXin Long /* RE-CONFIG 4.1 (STREAM OUT RESET) 3597cc16f00fSXin Long * 0 1 2 3 3598cc16f00fSXin 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 3599cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3600cc16f00fSXin Long * | Parameter Type = 13 | Parameter Length = 16 + 2 * N | 3601cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3602cc16f00fSXin Long * | Re-configuration Request Sequence Number | 3603cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3604cc16f00fSXin Long * | Re-configuration Response Sequence Number | 3605cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3606cc16f00fSXin Long * | Sender's Last Assigned TSN | 3607cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3608cc16f00fSXin Long * | Stream Number 1 (optional) | Stream Number 2 (optional) | 3609cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3610cc16f00fSXin Long * / ...... / 3611cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3612cc16f00fSXin Long * | Stream Number N-1 (optional) | Stream Number N (optional) | 3613cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3614cc16f00fSXin Long * 3615cc16f00fSXin Long * RE-CONFIG 4.2 (STREAM IN RESET) 3616cc16f00fSXin Long * 0 1 2 3 3617cc16f00fSXin 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 3618cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3619cc16f00fSXin Long * | Parameter Type = 14 | Parameter Length = 8 + 2 * N | 3620cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3621cc16f00fSXin Long * | Re-configuration Request Sequence Number | 3622cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3623cc16f00fSXin Long * | Stream Number 1 (optional) | Stream Number 2 (optional) | 3624cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3625cc16f00fSXin Long * / ...... / 3626cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3627cc16f00fSXin Long * | Stream Number N-1 (optional) | Stream Number N (optional) | 3628cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3629cc16f00fSXin Long */ 3630cc16f00fSXin Long struct sctp_chunk *sctp_make_strreset_req( 3631cc16f00fSXin Long const struct sctp_association *asoc, 36321da4fc97SXin Long __u16 stream_num, __be16 *stream_list, 3633cc16f00fSXin Long bool out, bool in) 3634cc16f00fSXin Long { 3635423852f8SXin Long __u16 stream_len = stream_num * sizeof(__u16); 3636cc16f00fSXin Long struct sctp_strreset_outreq outreq; 3637cc16f00fSXin Long struct sctp_strreset_inreq inreq; 3638cc16f00fSXin Long struct sctp_chunk *retval; 363916e1a919SXin Long __u16 outlen, inlen; 3640cc16f00fSXin Long 3641cc16f00fSXin Long outlen = (sizeof(outreq) + stream_len) * out; 3642cc16f00fSXin Long inlen = (sizeof(inreq) + stream_len) * in; 3643cc16f00fSXin Long 3644cc16f00fSXin Long retval = sctp_make_reconf(asoc, outlen + inlen); 3645cc16f00fSXin Long if (!retval) 3646cc16f00fSXin Long return NULL; 3647cc16f00fSXin Long 3648cc16f00fSXin Long if (outlen) { 3649cc16f00fSXin Long outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST; 3650cc16f00fSXin Long outreq.param_hdr.length = htons(outlen); 3651cc16f00fSXin Long outreq.request_seq = htonl(asoc->strreset_outseq); 3652cc16f00fSXin Long outreq.response_seq = htonl(asoc->strreset_inseq - 1); 3653cc16f00fSXin Long outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1); 3654cc16f00fSXin Long 3655cc16f00fSXin Long sctp_addto_chunk(retval, sizeof(outreq), &outreq); 3656cc16f00fSXin Long 3657cc16f00fSXin Long if (stream_len) 3658cc16f00fSXin Long sctp_addto_chunk(retval, stream_len, stream_list); 3659cc16f00fSXin Long } 3660cc16f00fSXin Long 3661cc16f00fSXin Long if (inlen) { 3662cc16f00fSXin Long inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST; 3663cc16f00fSXin Long inreq.param_hdr.length = htons(inlen); 3664cc16f00fSXin Long inreq.request_seq = htonl(asoc->strreset_outseq + out); 3665cc16f00fSXin Long 3666cc16f00fSXin Long sctp_addto_chunk(retval, sizeof(inreq), &inreq); 3667cc16f00fSXin Long 3668cc16f00fSXin Long if (stream_len) 3669cc16f00fSXin Long sctp_addto_chunk(retval, stream_len, stream_list); 3670cc16f00fSXin Long } 3671cc16f00fSXin Long 3672cc16f00fSXin Long return retval; 3673cc16f00fSXin Long } 3674c56480a1SXin Long 3675c56480a1SXin Long /* RE-CONFIG 4.3 (SSN/TSN RESET ALL) 3676c56480a1SXin Long * 0 1 2 3 3677c56480a1SXin 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 3678c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3679c56480a1SXin Long * | Parameter Type = 15 | Parameter Length = 8 | 3680c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3681c56480a1SXin Long * | Re-configuration Request Sequence Number | 3682c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3683c56480a1SXin Long */ 3684c56480a1SXin Long struct sctp_chunk *sctp_make_strreset_tsnreq( 3685c56480a1SXin Long const struct sctp_association *asoc) 3686c56480a1SXin Long { 3687c56480a1SXin Long struct sctp_strreset_tsnreq tsnreq; 3688c56480a1SXin Long __u16 length = sizeof(tsnreq); 3689c56480a1SXin Long struct sctp_chunk *retval; 3690c56480a1SXin Long 3691c56480a1SXin Long retval = sctp_make_reconf(asoc, length); 3692c56480a1SXin Long if (!retval) 3693c56480a1SXin Long return NULL; 3694c56480a1SXin Long 3695c56480a1SXin Long tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST; 3696c56480a1SXin Long tsnreq.param_hdr.length = htons(length); 3697c56480a1SXin Long tsnreq.request_seq = htonl(asoc->strreset_outseq); 3698c56480a1SXin Long 3699c56480a1SXin Long sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq); 3700c56480a1SXin Long 3701c56480a1SXin Long return retval; 3702c56480a1SXin Long } 370378098117SXin Long 370478098117SXin Long /* RE-CONFIG 4.5/4.6 (ADD STREAM) 370578098117SXin Long * 0 1 2 3 370678098117SXin 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 370778098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 370878098117SXin Long * | Parameter Type = 17 | Parameter Length = 12 | 370978098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 371078098117SXin Long * | Re-configuration Request Sequence Number | 371178098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 371278098117SXin Long * | Number of new streams | Reserved | 371378098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 371478098117SXin Long */ 371578098117SXin Long struct sctp_chunk *sctp_make_strreset_addstrm( 371678098117SXin Long const struct sctp_association *asoc, 371778098117SXin Long __u16 out, __u16 in) 371878098117SXin Long { 371978098117SXin Long struct sctp_strreset_addstrm addstrm; 372078098117SXin Long __u16 size = sizeof(addstrm); 372178098117SXin Long struct sctp_chunk *retval; 372278098117SXin Long 372378098117SXin Long retval = sctp_make_reconf(asoc, (!!out + !!in) * size); 372478098117SXin Long if (!retval) 372578098117SXin Long return NULL; 372678098117SXin Long 372778098117SXin Long if (out) { 372878098117SXin Long addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS; 372978098117SXin Long addstrm.param_hdr.length = htons(size); 373078098117SXin Long addstrm.number_of_streams = htons(out); 373178098117SXin Long addstrm.request_seq = htonl(asoc->strreset_outseq); 373278098117SXin Long addstrm.reserved = 0; 373378098117SXin Long 373478098117SXin Long sctp_addto_chunk(retval, size, &addstrm); 373578098117SXin Long } 373678098117SXin Long 373778098117SXin Long if (in) { 373878098117SXin Long addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS; 373978098117SXin Long addstrm.param_hdr.length = htons(size); 374078098117SXin Long addstrm.number_of_streams = htons(in); 374178098117SXin Long addstrm.request_seq = htonl(asoc->strreset_outseq + !!out); 374278098117SXin Long addstrm.reserved = 0; 374378098117SXin Long 374478098117SXin Long sctp_addto_chunk(retval, size, &addstrm); 374578098117SXin Long } 374678098117SXin Long 374778098117SXin Long return retval; 374878098117SXin Long } 3749bd4b9f8bSXin Long 3750bd4b9f8bSXin Long /* RE-CONFIG 4.4 (RESP) 3751bd4b9f8bSXin Long * 0 1 2 3 3752bd4b9f8bSXin 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 3753bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3754bd4b9f8bSXin Long * | Parameter Type = 16 | Parameter Length | 3755bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3756bd4b9f8bSXin Long * | Re-configuration Response Sequence Number | 3757bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3758bd4b9f8bSXin Long * | Result | 3759bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3760bd4b9f8bSXin Long */ 3761327c0dabSXin Long struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc, 3762bd4b9f8bSXin Long __u32 result, __u32 sn) 3763bd4b9f8bSXin Long { 3764bd4b9f8bSXin Long struct sctp_strreset_resp resp; 3765bd4b9f8bSXin Long __u16 length = sizeof(resp); 3766bd4b9f8bSXin Long struct sctp_chunk *retval; 3767bd4b9f8bSXin Long 3768bd4b9f8bSXin Long retval = sctp_make_reconf(asoc, length); 3769bd4b9f8bSXin Long if (!retval) 3770bd4b9f8bSXin Long return NULL; 3771bd4b9f8bSXin Long 3772bd4b9f8bSXin Long resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; 3773bd4b9f8bSXin Long resp.param_hdr.length = htons(length); 3774bd4b9f8bSXin Long resp.response_seq = htonl(sn); 3775bd4b9f8bSXin Long resp.result = htonl(result); 3776bd4b9f8bSXin Long 3777bd4b9f8bSXin Long sctp_addto_chunk(retval, sizeof(resp), &resp); 3778bd4b9f8bSXin Long 3779bd4b9f8bSXin Long return retval; 3780bd4b9f8bSXin Long } 3781bd4b9f8bSXin Long 3782bd4b9f8bSXin Long /* RE-CONFIG 4.4 OPTIONAL (TSNRESP) 3783bd4b9f8bSXin Long * 0 1 2 3 3784bd4b9f8bSXin 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 3785bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3786bd4b9f8bSXin Long * | Parameter Type = 16 | Parameter Length | 3787bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3788bd4b9f8bSXin Long * | Re-configuration Response Sequence Number | 3789bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3790bd4b9f8bSXin Long * | Result | 3791bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3792bd4b9f8bSXin Long * | Sender's Next TSN (optional) | 3793bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3794bd4b9f8bSXin Long * | Receiver's Next TSN (optional) | 3795bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3796bd4b9f8bSXin Long */ 3797327c0dabSXin Long struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc, 3798bd4b9f8bSXin Long __u32 result, __u32 sn, 3799327c0dabSXin Long __u32 sender_tsn, 3800327c0dabSXin Long __u32 receiver_tsn) 3801bd4b9f8bSXin Long { 3802bd4b9f8bSXin Long struct sctp_strreset_resptsn tsnresp; 3803bd4b9f8bSXin Long __u16 length = sizeof(tsnresp); 3804bd4b9f8bSXin Long struct sctp_chunk *retval; 3805bd4b9f8bSXin Long 3806bd4b9f8bSXin Long retval = sctp_make_reconf(asoc, length); 3807bd4b9f8bSXin Long if (!retval) 3808bd4b9f8bSXin Long return NULL; 3809bd4b9f8bSXin Long 3810bd4b9f8bSXin Long tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; 3811bd4b9f8bSXin Long tsnresp.param_hdr.length = htons(length); 3812bd4b9f8bSXin Long 3813bd4b9f8bSXin Long tsnresp.response_seq = htonl(sn); 3814bd4b9f8bSXin Long tsnresp.result = htonl(result); 3815bd4b9f8bSXin Long tsnresp.senders_next_tsn = htonl(sender_tsn); 3816bd4b9f8bSXin Long tsnresp.receivers_next_tsn = htonl(receiver_tsn); 3817bd4b9f8bSXin Long 3818bd4b9f8bSXin Long sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp); 3819bd4b9f8bSXin Long 3820bd4b9f8bSXin Long return retval; 3821bd4b9f8bSXin Long } 3822ea625043SXin Long 3823ea625043SXin Long bool sctp_verify_reconf(const struct sctp_association *asoc, 3824ea625043SXin Long struct sctp_chunk *chunk, 3825ea625043SXin Long struct sctp_paramhdr **errp) 3826ea625043SXin Long { 3827ea625043SXin Long struct sctp_reconf_chunk *hdr; 3828ea625043SXin Long union sctp_params param; 38291da4fc97SXin Long __be16 last = 0; 38301da4fc97SXin Long __u16 cnt = 0; 3831ea625043SXin Long 3832ea625043SXin Long hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; 3833ea625043SXin Long sctp_walk_params(param, hdr, params) { 3834ea625043SXin Long __u16 length = ntohs(param.p->length); 3835ea625043SXin Long 3836ea625043SXin Long *errp = param.p; 3837ea625043SXin Long if (cnt++ > 2) 3838ea625043SXin Long return false; 3839ea625043SXin Long switch (param.p->type) { 3840ea625043SXin Long case SCTP_PARAM_RESET_OUT_REQUEST: 3841ea625043SXin Long if (length < sizeof(struct sctp_strreset_outreq) || 3842ea625043SXin Long (last && last != SCTP_PARAM_RESET_RESPONSE && 3843ea625043SXin Long last != SCTP_PARAM_RESET_IN_REQUEST)) 3844ea625043SXin Long return false; 3845ea625043SXin Long break; 3846ea625043SXin Long case SCTP_PARAM_RESET_IN_REQUEST: 3847ea625043SXin Long if (length < sizeof(struct sctp_strreset_inreq) || 3848ea625043SXin Long (last && last != SCTP_PARAM_RESET_OUT_REQUEST)) 3849ea625043SXin Long return false; 3850ea625043SXin Long break; 3851ea625043SXin Long case SCTP_PARAM_RESET_RESPONSE: 3852ea625043SXin Long if ((length != sizeof(struct sctp_strreset_resp) && 3853ea625043SXin Long length != sizeof(struct sctp_strreset_resptsn)) || 3854ea625043SXin Long (last && last != SCTP_PARAM_RESET_RESPONSE && 3855ea625043SXin Long last != SCTP_PARAM_RESET_OUT_REQUEST)) 3856ea625043SXin Long return false; 3857ea625043SXin Long break; 3858ea625043SXin Long case SCTP_PARAM_RESET_TSN_REQUEST: 3859ea625043SXin Long if (length != 3860ea625043SXin Long sizeof(struct sctp_strreset_tsnreq) || last) 3861ea625043SXin Long return false; 3862ea625043SXin Long break; 3863ea625043SXin Long case SCTP_PARAM_RESET_ADD_IN_STREAMS: 3864ea625043SXin Long if (length != sizeof(struct sctp_strreset_addstrm) || 3865ea625043SXin Long (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS)) 3866ea625043SXin Long return false; 3867ea625043SXin Long break; 3868ea625043SXin Long case SCTP_PARAM_RESET_ADD_OUT_STREAMS: 3869ea625043SXin Long if (length != sizeof(struct sctp_strreset_addstrm) || 3870ea625043SXin Long (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS)) 3871ea625043SXin Long return false; 3872ea625043SXin Long break; 3873ea625043SXin Long default: 3874ea625043SXin Long return false; 3875ea625043SXin Long } 3876ea625043SXin Long 3877ea625043SXin Long last = param.p->type; 3878ea625043SXin Long } 3879ea625043SXin Long 3880ea625043SXin Long return true; 3881ea625043SXin Long } 3882