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 8611da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 8621da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 8631da177e4SLinus Torvalds 864072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, 865e61e4055SXin Long sizeof(shut), GFP_ATOMIC); 8661da177e4SLinus Torvalds if (!retval) 8671da177e4SLinus Torvalds goto nodata; 8681da177e4SLinus Torvalds 8691da177e4SLinus Torvalds retval->subh.shutdown_hdr = 8701da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 8711da177e4SLinus Torvalds 8721da177e4SLinus Torvalds if (chunk) 8731da177e4SLinus Torvalds retval->transport = chunk->transport; 8741da177e4SLinus Torvalds nodata: 8751da177e4SLinus Torvalds return retval; 8761da177e4SLinus Torvalds } 8771da177e4SLinus Torvalds 8781da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8791da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8801da177e4SLinus Torvalds { 8811da177e4SLinus Torvalds struct sctp_chunk *retval; 8821da177e4SLinus Torvalds 883cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0, 884cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 8851da177e4SLinus Torvalds 8861da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8871da177e4SLinus Torvalds * 8881da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8891da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8901da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8911da177e4SLinus Torvalds * to which it is replying. 8921da177e4SLinus Torvalds * 8931da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 8941da177e4SLinus Torvalds */ 8951da177e4SLinus Torvalds if (retval && chunk) 8961da177e4SLinus Torvalds retval->transport = chunk->transport; 8971da177e4SLinus Torvalds 8981da177e4SLinus Torvalds return retval; 8991da177e4SLinus Torvalds } 9001da177e4SLinus Torvalds 9011da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 9021da177e4SLinus Torvalds const struct sctp_association *asoc, 9031da177e4SLinus Torvalds const struct sctp_chunk *chunk) 9041da177e4SLinus Torvalds { 9051da177e4SLinus Torvalds struct sctp_chunk *retval; 9061da177e4SLinus Torvalds __u8 flags = 0; 9071da177e4SLinus Torvalds 908047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 909047a2428SJerome Forissier * reflected) 910047a2428SJerome Forissier */ 9111da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 9121da177e4SLinus Torvalds 913cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 914cea8768fSMarcelo Ricardo Leitner 0, GFP_ATOMIC); 9151da177e4SLinus Torvalds 9161da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9171da177e4SLinus Torvalds * 9181da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9191da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9201da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9211da177e4SLinus Torvalds * to which it is replying. 9221da177e4SLinus Torvalds * 9231da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 9241da177e4SLinus Torvalds * came from.] 9251da177e4SLinus Torvalds */ 9261da177e4SLinus Torvalds if (retval && chunk) 9271da177e4SLinus Torvalds retval->transport = chunk->transport; 9281da177e4SLinus Torvalds 9291da177e4SLinus Torvalds return retval; 9301da177e4SLinus Torvalds } 9311da177e4SLinus Torvalds 9321da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 933047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 9341da177e4SLinus Torvalds */ 9351da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 9361da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9371da177e4SLinus Torvalds const size_t hint) 9381da177e4SLinus Torvalds { 9391da177e4SLinus Torvalds struct sctp_chunk *retval; 9401da177e4SLinus Torvalds __u8 flags = 0; 9411da177e4SLinus Torvalds 942047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 943047a2428SJerome Forissier * an INIT (vtag will be reflected). 944047a2428SJerome Forissier */ 945047a2428SJerome Forissier if (!asoc) { 946047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 947047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 948047a2428SJerome Forissier flags = 0; 949047a2428SJerome Forissier else 950047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 951047a2428SJerome Forissier } 9521da177e4SLinus Torvalds 953cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint, 954cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 9551da177e4SLinus Torvalds 9561da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9571da177e4SLinus Torvalds * 9581da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9591da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9601da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9611da177e4SLinus Torvalds * to which it is replying. 9621da177e4SLinus Torvalds * 9631da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9641da177e4SLinus Torvalds */ 9651da177e4SLinus Torvalds if (retval && chunk) 9661da177e4SLinus Torvalds retval->transport = chunk->transport; 9671da177e4SLinus Torvalds 9681da177e4SLinus Torvalds return retval; 9691da177e4SLinus Torvalds } 9701da177e4SLinus Torvalds 9711da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 9721da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 9731da177e4SLinus Torvalds const struct sctp_association *asoc, 974327c0dabSXin Long const struct sctp_chunk *chunk, 975327c0dabSXin Long __u32 tsn) 9761da177e4SLinus Torvalds { 9771da177e4SLinus Torvalds struct sctp_chunk *retval; 9789f81bcd9SAl Viro __be32 payload; 9791da177e4SLinus Torvalds 980d8238d9dSXin Long retval = sctp_make_abort(asoc, chunk, 981d8238d9dSXin Long sizeof(struct sctp_errhdr) + sizeof(tsn)); 9821da177e4SLinus Torvalds 9831da177e4SLinus Torvalds if (!retval) 9841da177e4SLinus Torvalds goto no_mem; 9851da177e4SLinus Torvalds 9861da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 9871da177e4SLinus Torvalds payload = htonl(tsn); 98800f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 98900f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 9901da177e4SLinus Torvalds 9911da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9921da177e4SLinus Torvalds * 9931da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9941da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9951da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9961da177e4SLinus Torvalds * to which it is replying. 9971da177e4SLinus Torvalds * 9981da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9991da177e4SLinus Torvalds */ 10001da177e4SLinus Torvalds if (chunk) 10011da177e4SLinus Torvalds retval->transport = chunk->transport; 10021da177e4SLinus Torvalds 10031da177e4SLinus Torvalds no_mem: 10041da177e4SLinus Torvalds return retval; 10051da177e4SLinus Torvalds } 10061da177e4SLinus Torvalds 10071da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 10081da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 10096ce8e9ceSAl Viro struct msghdr *msg, 1010c164a9baSSridhar Samudrala size_t paylen) 10111da177e4SLinus Torvalds { 10121da177e4SLinus Torvalds struct sctp_chunk *retval; 1013c164a9baSSridhar Samudrala void *payload = NULL; 1014c164a9baSSridhar Samudrala int err; 10151da177e4SLinus Torvalds 1016d8238d9dSXin Long retval = sctp_make_abort(asoc, NULL, 1017d8238d9dSXin Long sizeof(struct sctp_errhdr) + paylen); 10181da177e4SLinus Torvalds if (!retval) 10191da177e4SLinus Torvalds goto err_chunk; 10201da177e4SLinus Torvalds 10211da177e4SLinus Torvalds if (paylen) { 10221da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 1023c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 10241da177e4SLinus Torvalds if (!payload) 10251da177e4SLinus Torvalds goto err_payload; 10261da177e4SLinus Torvalds 10276ce8e9ceSAl Viro err = memcpy_from_msg(payload, msg, paylen); 1028c164a9baSSridhar Samudrala if (err < 0) 10291da177e4SLinus Torvalds goto err_copy; 10301da177e4SLinus Torvalds } 10311da177e4SLinus Torvalds 103200f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 103300f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10341da177e4SLinus Torvalds 10351da177e4SLinus Torvalds if (paylen) 10361da177e4SLinus Torvalds kfree(payload); 10371da177e4SLinus Torvalds 10381da177e4SLinus Torvalds return retval; 10391da177e4SLinus Torvalds 10401da177e4SLinus Torvalds err_copy: 10411da177e4SLinus Torvalds kfree(payload); 10421da177e4SLinus Torvalds err_payload: 10431da177e4SLinus Torvalds sctp_chunk_free(retval); 10441da177e4SLinus Torvalds retval = NULL; 10451da177e4SLinus Torvalds err_chunk: 10461da177e4SLinus Torvalds return retval; 10471da177e4SLinus Torvalds } 10481da177e4SLinus Torvalds 10495c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 10505c94bf86SAdrian Bunk * enough. 10515c94bf86SAdrian Bunk */ 10525c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 10535c94bf86SAdrian Bunk const void *data) 10545c94bf86SAdrian Bunk { 10555c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 1056327c0dabSXin Long void *target; 10575c94bf86SAdrian Bunk 10585c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 10595c94bf86SAdrian Bunk 10606383cfb3SVlad Yasevich if (data) 10615c94bf86SAdrian Bunk memcpy(target, data, len); 10626383cfb3SVlad Yasevich else 10636383cfb3SVlad Yasevich memset(target, 0, len); 10645c94bf86SAdrian Bunk 10655c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 10665c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 10675c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 10685c94bf86SAdrian Bunk 10695c94bf86SAdrian Bunk return target; 10705c94bf86SAdrian Bunk } 10715c94bf86SAdrian Bunk 10721da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 10731da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 10741da177e4SLinus Torvalds const struct sctp_association *asoc, 10751da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10761da177e4SLinus Torvalds const __u8 *payload, 10771da177e4SLinus Torvalds const size_t paylen) 10781da177e4SLinus Torvalds { 10791da177e4SLinus Torvalds struct sctp_chunk *retval; 10801da177e4SLinus Torvalds struct sctp_paramhdr phdr; 10811da177e4SLinus Torvalds 1082d8238d9dSXin Long retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) + 1083d8238d9dSXin Long paylen + sizeof(phdr)); 10841da177e4SLinus Torvalds if (!retval) 10851da177e4SLinus Torvalds goto end; 10861da177e4SLinus Torvalds 10873c918704SXin Long sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen + 10883c918704SXin Long sizeof(phdr)); 10891da177e4SLinus Torvalds 10901da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 10911da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 109200f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10933c918704SXin Long sctp_addto_param(retval, sizeof(phdr), &phdr); 10941da177e4SLinus Torvalds 10951da177e4SLinus Torvalds end: 10961da177e4SLinus Torvalds return retval; 10971da177e4SLinus Torvalds } 10981da177e4SLinus Torvalds 1099ba016670SWei Yongjun struct sctp_chunk *sctp_make_violation_paramlen( 1100ba016670SWei Yongjun const struct sctp_association *asoc, 1101ba016670SWei Yongjun const struct sctp_chunk *chunk, 1102ba016670SWei Yongjun struct sctp_paramhdr *param) 1103ba016670SWei Yongjun { 1104ba016670SWei Yongjun static const char error[] = "The following parameter had invalid length:"; 1105d8238d9dSXin Long size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) + 11063c918704SXin Long sizeof(*param); 1107327c0dabSXin Long struct sctp_chunk *retval; 1108ba016670SWei Yongjun 1109ba016670SWei Yongjun retval = sctp_make_abort(asoc, chunk, payload_len); 1110ba016670SWei Yongjun if (!retval) 1111ba016670SWei Yongjun goto nodata; 1112ba016670SWei Yongjun 1113ba016670SWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, 11143c918704SXin Long sizeof(error) + sizeof(*param)); 1115ba016670SWei Yongjun sctp_addto_chunk(retval, sizeof(error), error); 11163c918704SXin Long sctp_addto_param(retval, sizeof(*param), param); 1117ba016670SWei Yongjun 1118ba016670SWei Yongjun nodata: 1119ba016670SWei Yongjun return retval; 1120ba016670SWei Yongjun } 1121ba016670SWei Yongjun 1122de4594a5SNeil Horman struct sctp_chunk *sctp_make_violation_max_retrans( 1123de4594a5SNeil Horman const struct sctp_association *asoc, 1124de4594a5SNeil Horman const struct sctp_chunk *chunk) 1125de4594a5SNeil Horman { 112639a2d5cbSColin Ian King static const char error[] = "Association exceeded its max_retrans count"; 1127d8238d9dSXin Long size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr); 1128327c0dabSXin Long struct sctp_chunk *retval; 1129de4594a5SNeil Horman 1130de4594a5SNeil Horman retval = sctp_make_abort(asoc, chunk, payload_len); 1131de4594a5SNeil Horman if (!retval) 1132de4594a5SNeil Horman goto nodata; 1133de4594a5SNeil Horman 1134de4594a5SNeil Horman sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); 1135de4594a5SNeil Horman sctp_addto_chunk(retval, sizeof(error), error); 1136de4594a5SNeil Horman 1137de4594a5SNeil Horman nodata: 1138de4594a5SNeil Horman return retval; 1139de4594a5SNeil Horman } 1140de4594a5SNeil Horman 11411da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 11421da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 114392c73af5SWei Yongjun const struct sctp_transport *transport) 11441da177e4SLinus Torvalds { 1145edf903f8SXin Long struct sctp_sender_hb_info hbinfo; 114692c73af5SWei Yongjun struct sctp_chunk *retval; 114792c73af5SWei Yongjun 1148cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, 1149cea8768fSMarcelo Ricardo Leitner sizeof(hbinfo), GFP_ATOMIC); 11501da177e4SLinus Torvalds 11511da177e4SLinus Torvalds if (!retval) 11521da177e4SLinus Torvalds goto nodata; 11531da177e4SLinus Torvalds 115492c73af5SWei Yongjun hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; 1155edf903f8SXin Long hbinfo.param_hdr.length = htons(sizeof(hbinfo)); 115692c73af5SWei Yongjun hbinfo.daddr = transport->ipaddr; 115792c73af5SWei Yongjun hbinfo.sent_at = jiffies; 115892c73af5SWei Yongjun hbinfo.hb_nonce = transport->hb_nonce; 115992c73af5SWei Yongjun 11601da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 11611da177e4SLinus Torvalds * what transport it belongs to. 11621da177e4SLinus Torvalds */ 11631da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 116492c73af5SWei Yongjun retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), 116592c73af5SWei Yongjun &hbinfo); 11661da177e4SLinus Torvalds 11671da177e4SLinus Torvalds nodata: 11681da177e4SLinus Torvalds return retval; 11691da177e4SLinus Torvalds } 11701da177e4SLinus Torvalds 11711da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 11721da177e4SLinus Torvalds const struct sctp_chunk *chunk, 1173327c0dabSXin Long const void *payload, 1174327c0dabSXin Long const size_t paylen) 11751da177e4SLinus Torvalds { 11761da177e4SLinus Torvalds struct sctp_chunk *retval; 11771da177e4SLinus Torvalds 1178cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen, 1179cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 11801da177e4SLinus Torvalds if (!retval) 11811da177e4SLinus Torvalds goto nodata; 11821da177e4SLinus Torvalds 11831da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 11841da177e4SLinus Torvalds 11851da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11861da177e4SLinus Torvalds * 11871da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11881da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 11891da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 11901da177e4SLinus Torvalds * to which it is replying. 11911da177e4SLinus Torvalds * 11921da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 11931da177e4SLinus Torvalds */ 11941da177e4SLinus Torvalds if (chunk) 11951da177e4SLinus Torvalds retval->transport = chunk->transport; 11961da177e4SLinus Torvalds 11971da177e4SLinus Torvalds nodata: 11981da177e4SLinus Torvalds return retval; 11991da177e4SLinus Torvalds } 12001da177e4SLinus Torvalds 12011da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 12021da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 12031da177e4SLinus Torvalds */ 12041da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 12051da177e4SLinus Torvalds const struct sctp_association *asoc, 12061da177e4SLinus Torvalds const struct sctp_chunk *chunk, 12071da177e4SLinus Torvalds size_t size) 12081da177e4SLinus Torvalds { 12091da177e4SLinus Torvalds struct sctp_chunk *retval; 12101da177e4SLinus Torvalds 1211072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, 1212d8238d9dSXin Long sizeof(struct sctp_errhdr) + size, 1213d8238d9dSXin Long GFP_ATOMIC); 12141da177e4SLinus Torvalds if (!retval) 12151da177e4SLinus Torvalds goto nodata; 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 12181da177e4SLinus Torvalds * 12191da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 12201da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 12211da177e4SLinus Torvalds * address from which it received the DATA or control chunk 12221da177e4SLinus Torvalds * to which it is replying. 12231da177e4SLinus Torvalds * 12241da177e4SLinus Torvalds */ 12251da177e4SLinus Torvalds if (chunk) 12261da177e4SLinus Torvalds retval->transport = chunk->transport; 12271da177e4SLinus Torvalds 12281da177e4SLinus Torvalds nodata: 12291da177e4SLinus Torvalds return retval; 12301da177e4SLinus Torvalds } 12311da177e4SLinus Torvalds 12328914f4baSMarcelo Ricardo Leitner /* Create an Operation Error chunk of a fixed size, specifically, 12338914f4baSMarcelo Ricardo Leitner * min(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) - overheads. 12348914f4baSMarcelo Ricardo Leitner * This is a helper function to allocate an error chunk for for those 12358914f4baSMarcelo Ricardo Leitner * invalid parameter codes in which we may not want to report all the 12368914f4baSMarcelo Ricardo Leitner * errors, if the incoming chunk is large. If it can't fit in a single 12378914f4baSMarcelo Ricardo Leitner * packet, we ignore it. 12385fa782c2SNeil Horman */ 12398914f4baSMarcelo Ricardo Leitner static inline struct sctp_chunk *sctp_make_op_error_limited( 12405fa782c2SNeil Horman const struct sctp_association *asoc, 12415fa782c2SNeil Horman const struct sctp_chunk *chunk) 12425fa782c2SNeil Horman { 12438914f4baSMarcelo Ricardo Leitner size_t size = SCTP_DEFAULT_MAXSEGMENT; 12448914f4baSMarcelo Ricardo Leitner struct sctp_sock *sp = NULL; 12455fa782c2SNeil Horman 12468914f4baSMarcelo Ricardo Leitner if (asoc) { 12478914f4baSMarcelo Ricardo Leitner size = min_t(size_t, size, asoc->pathmtu); 12488914f4baSMarcelo Ricardo Leitner sp = sctp_sk(asoc->base.sk); 12498914f4baSMarcelo Ricardo Leitner } 12508914f4baSMarcelo Ricardo Leitner 12518914f4baSMarcelo Ricardo Leitner size = sctp_mtu_payload(sp, size, sizeof(struct sctp_errhdr)); 12525fa782c2SNeil Horman 12535fa782c2SNeil Horman return sctp_make_op_error_space(asoc, chunk, size); 12545fa782c2SNeil Horman } 12555fa782c2SNeil Horman 12561da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 12571da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 12581da177e4SLinus Torvalds const struct sctp_chunk *chunk, 125963706c5cSAl Viro __be16 cause_code, const void *payload, 12606383cfb3SVlad Yasevich size_t paylen, size_t reserve_tail) 12611da177e4SLinus Torvalds { 12621da177e4SLinus Torvalds struct sctp_chunk *retval; 12631da177e4SLinus Torvalds 12646383cfb3SVlad Yasevich retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); 12651da177e4SLinus Torvalds if (!retval) 12661da177e4SLinus Torvalds goto nodata; 12671da177e4SLinus Torvalds 12686383cfb3SVlad Yasevich sctp_init_cause(retval, cause_code, paylen + reserve_tail); 126900f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 12706383cfb3SVlad Yasevich if (reserve_tail) 12716383cfb3SVlad Yasevich sctp_addto_param(retval, reserve_tail, NULL); 12721da177e4SLinus Torvalds 12731da177e4SLinus Torvalds nodata: 12741da177e4SLinus Torvalds return retval; 12751da177e4SLinus Torvalds } 12761da177e4SLinus Torvalds 12771b1e0bc9SXin Long struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc, 12781b1e0bc9SXin Long __u16 key_id) 12794cd57c80SVlad Yasevich { 12804cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 1281327c0dabSXin Long struct sctp_hmac *hmac_desc; 1282327c0dabSXin Long struct sctp_chunk *retval; 12834cd57c80SVlad Yasevich 12844cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 12854cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 12864cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 12874cd57c80SVlad Yasevich return NULL; 12884cd57c80SVlad Yasevich 1289072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, 129096f7ef4dSXin Long hmac_desc->hmac_len + sizeof(auth_hdr), 1291cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 12924cd57c80SVlad Yasevich if (!retval) 12934cd57c80SVlad Yasevich return NULL; 12944cd57c80SVlad Yasevich 12954cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 12961b1e0bc9SXin Long auth_hdr.shkey_id = htons(key_id); 12974cd57c80SVlad Yasevich 129896f7ef4dSXin Long retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr), 12994cd57c80SVlad Yasevich &auth_hdr); 13004cd57c80SVlad Yasevich 1301594831a8SMarcelo Ricardo Leitner skb_put_zero(retval->skb, hmac_desc->hmac_len); 13024cd57c80SVlad Yasevich 13034cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 13044cd57c80SVlad Yasevich retval->chunk_hdr->length = 13054cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 13064cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 13074cd57c80SVlad Yasevich 13084cd57c80SVlad Yasevich return retval; 13094cd57c80SVlad Yasevich } 13104cd57c80SVlad Yasevich 13114cd57c80SVlad Yasevich 13121da177e4SLinus Torvalds /******************************************************************** 13131da177e4SLinus Torvalds * 2nd Level Abstractions 13141da177e4SLinus Torvalds ********************************************************************/ 13151da177e4SLinus Torvalds 13161da177e4SLinus Torvalds /* Turn an skb into a chunk. 13171da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 13183dc0a548Swangweidong * 13193dc0a548Swangweidong * sctpimpguide-05.txt Section 2.8.2 13203dc0a548Swangweidong * M1) Each time a new DATA chunk is transmitted 13213dc0a548Swangweidong * set the 'TSN.Missing.Report' count for that TSN to 0. The 13223dc0a548Swangweidong * 'TSN.Missing.Report' count will be used to determine missing chunks 13233dc0a548Swangweidong * and when to fast retransmit. 13243dc0a548Swangweidong * 13251da177e4SLinus Torvalds */ 13261da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 13271da177e4SLinus Torvalds const struct sctp_association *asoc, 1328cea8768fSMarcelo Ricardo Leitner struct sock *sk, gfp_t gfp) 13291da177e4SLinus Torvalds { 13301da177e4SLinus Torvalds struct sctp_chunk *retval; 13311da177e4SLinus Torvalds 1332cea8768fSMarcelo Ricardo Leitner retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp); 13331da177e4SLinus Torvalds 13341da177e4SLinus Torvalds if (!retval) 13351da177e4SLinus Torvalds goto nodata; 1336bb33381dSDaniel Borkmann if (!sk) 1337bb33381dSDaniel Borkmann pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); 13381da177e4SLinus Torvalds 133979af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 13401da177e4SLinus Torvalds retval->skb = skb; 13411da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 13421da177e4SLinus Torvalds retval->singleton = 1; 13431da177e4SLinus Torvalds 1344c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 13451da177e4SLinus Torvalds 13461da177e4SLinus Torvalds /* Polish the bead hole. */ 13471da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 13481da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 13491da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 1350e7f02796SReshetova, Elena refcount_set(&retval->refcnt, 1); 13511da177e4SLinus Torvalds 13521da177e4SLinus Torvalds nodata: 13531da177e4SLinus Torvalds return retval; 13541da177e4SLinus Torvalds } 13551da177e4SLinus Torvalds 13561da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 13571da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 13581da177e4SLinus Torvalds union sctp_addr *dest) 13591da177e4SLinus Torvalds { 1360f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 136116b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 13621da177e4SLinus Torvalds } 13631da177e4SLinus Torvalds 13641da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 13651da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 13661da177e4SLinus Torvalds { 13671da177e4SLinus Torvalds /* If we have a known transport, use that. */ 13681da177e4SLinus Torvalds if (chunk->transport) { 13696a1e5f33SAl Viro return &chunk->transport->ipaddr; 13701da177e4SLinus Torvalds } else { 13711da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 13726a1e5f33SAl Viro return &chunk->source; 13731da177e4SLinus Torvalds } 13741da177e4SLinus Torvalds } 13751da177e4SLinus Torvalds 13761da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 13771da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 13781da177e4SLinus Torvalds */ 1379072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 1380cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1381cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 13821da177e4SLinus Torvalds { 1383922dbc5bSXin Long struct sctp_chunkhdr *chunk_hdr; 1384327c0dabSXin Long struct sctp_chunk *retval; 13851da177e4SLinus Torvalds struct sk_buff *skb; 13861da177e4SLinus Torvalds struct sock *sk; 138707f2c7abSAlexey Kodanev int chunklen; 138807f2c7abSAlexey Kodanev 138907f2c7abSAlexey Kodanev chunklen = SCTP_PAD4(sizeof(*chunk_hdr) + paylen); 139007f2c7abSAlexey Kodanev if (chunklen > SCTP_MAX_CHUNK_LEN) 139107f2c7abSAlexey Kodanev goto nodata; 13921da177e4SLinus Torvalds 13931da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 139407f2c7abSAlexey Kodanev skb = alloc_skb(chunklen, gfp); 13951da177e4SLinus Torvalds if (!skb) 13961da177e4SLinus Torvalds goto nodata; 13971da177e4SLinus Torvalds 13981da177e4SLinus Torvalds /* Make room for the chunk header. */ 1399922dbc5bSXin Long chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr)); 14001da177e4SLinus Torvalds chunk_hdr->type = type; 14011da177e4SLinus Torvalds chunk_hdr->flags = flags; 1402922dbc5bSXin Long chunk_hdr->length = htons(sizeof(*chunk_hdr)); 14031da177e4SLinus Torvalds 14041da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 1405cea8768fSMarcelo Ricardo Leitner retval = sctp_chunkify(skb, asoc, sk, gfp); 14061da177e4SLinus Torvalds if (!retval) { 14071da177e4SLinus Torvalds kfree_skb(skb); 14081da177e4SLinus Torvalds goto nodata; 14091da177e4SLinus Torvalds } 14101da177e4SLinus Torvalds 14111da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 1412922dbc5bSXin Long retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr); 14131da177e4SLinus Torvalds 14144cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 14154cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 14164cd57c80SVlad Yasevich retval->auth = 1; 14174cd57c80SVlad Yasevich 14181da177e4SLinus Torvalds return retval; 14191da177e4SLinus Torvalds nodata: 14201da177e4SLinus Torvalds return NULL; 14211da177e4SLinus Torvalds } 14221da177e4SLinus Torvalds 1423072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 1424cea8768fSMarcelo Ricardo Leitner __u8 flags, int paylen, gfp_t gfp) 1425072017b4SVlad Yasevich { 1426cea8768fSMarcelo Ricardo Leitner return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp); 1427072017b4SVlad Yasevich } 1428072017b4SVlad Yasevich 1429ad05a7a0SXin Long struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc, 1430ad05a7a0SXin Long __u8 flags, int paylen, gfp_t gfp) 1431ad05a7a0SXin Long { 1432ad05a7a0SXin Long return _sctp_make_chunk(asoc, SCTP_CID_I_DATA, flags, paylen, gfp); 1433ad05a7a0SXin Long } 1434ad05a7a0SXin Long 1435072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 1436cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1437cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 1438072017b4SVlad Yasevich { 1439cea8768fSMarcelo Ricardo Leitner struct sctp_chunk *chunk; 1440072017b4SVlad Yasevich 1441cea8768fSMarcelo Ricardo Leitner chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp); 1442072017b4SVlad Yasevich if (chunk) 1443072017b4SVlad Yasevich sctp_control_set_owner_w(chunk); 1444072017b4SVlad Yasevich 1445072017b4SVlad Yasevich return chunk; 1446072017b4SVlad Yasevich } 14471da177e4SLinus Torvalds 14481da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 14491da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 14501da177e4SLinus Torvalds { 1451a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1452a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1453a08de64dSVlad Yasevich 1454c485658bSDaniel Borkmann consume_skb(chunk->skb); 1455c485658bSDaniel Borkmann consume_skb(chunk->auth_chunk); 14561da177e4SLinus Torvalds 14571da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 14581da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 14591da177e4SLinus Torvalds } 14601da177e4SLinus Torvalds 14611da177e4SLinus Torvalds /* Possibly, free the chunk. */ 14621da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 14631da177e4SLinus Torvalds { 14641da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 14651da177e4SLinus Torvalds if (chunk->msg) 14661da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 14671da177e4SLinus Torvalds 14681da177e4SLinus Torvalds sctp_chunk_put(chunk); 14691da177e4SLinus Torvalds } 14701da177e4SLinus Torvalds 14711da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 14721da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 14731da177e4SLinus Torvalds { 1474e7f02796SReshetova, Elena refcount_inc(&ch->refcnt); 14751da177e4SLinus Torvalds } 14761da177e4SLinus Torvalds 14771da177e4SLinus Torvalds /* Release a reference to the chunk. */ 14781da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 14791da177e4SLinus Torvalds { 1480e7f02796SReshetova, Elena if (refcount_dec_and_test(&ch->refcnt)) 14811da177e4SLinus Torvalds sctp_chunk_destroy(ch); 14821da177e4SLinus Torvalds } 14831da177e4SLinus Torvalds 14841da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 14851da177e4SLinus Torvalds * enough. 14861da177e4SLinus Torvalds */ 14871da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 14881da177e4SLinus Torvalds { 14891da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 1490e2f036a9SMarcelo Ricardo Leitner int padlen = SCTP_PAD4(chunklen) - chunklen; 1491327c0dabSXin Long void *target; 14921da177e4SLinus Torvalds 1493b952f4dfSyuan linyu skb_put_zero(chunk->skb, padlen); 149459ae1d12SJohannes Berg target = skb_put_data(chunk->skb, data, len); 14951da177e4SLinus Torvalds 14961da177e4SLinus Torvalds /* Adjust the chunk length field. */ 14971da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 149827a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 14991da177e4SLinus Torvalds 15001da177e4SLinus Torvalds return target; 15011da177e4SLinus Torvalds } 15021da177e4SLinus Torvalds 15031da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 15041da177e4SLinus Torvalds * chunk is not big enough. 15051da177e4SLinus Torvalds * Returns a kernel err value. 15061da177e4SLinus Torvalds */ 1507e0eb093eSAl Viro int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 1508e0eb093eSAl Viro struct iov_iter *from) 15091da177e4SLinus Torvalds { 1510e0eb093eSAl Viro void *target; 15111da177e4SLinus Torvalds 15121da177e4SLinus Torvalds /* Make room in chunk for data. */ 15131da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 15141da177e4SLinus Torvalds 15151da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 15163b6d4dbfSAl Viro if (!copy_from_iter_full(target, len, from)) 1517e0eb093eSAl Viro return -EFAULT; 15181da177e4SLinus Torvalds 15191da177e4SLinus Torvalds /* Adjust the chunk length field. */ 15201da177e4SLinus Torvalds chunk->chunk_hdr->length = 15211da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 152227a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 15231da177e4SLinus Torvalds 1524e0eb093eSAl Viro return 0; 15251da177e4SLinus Torvalds } 15261da177e4SLinus Torvalds 15271da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15281da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15291da177e4SLinus Torvalds */ 15301da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 15311da177e4SLinus Torvalds { 1532ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 1533327c0dabSXin Long struct sctp_chunk *lchunk; 1534327c0dabSXin Long struct sctp_datamsg *msg; 1535327c0dabSXin Long __u16 ssn, sid; 15361da177e4SLinus Torvalds 15371da177e4SLinus Torvalds if (chunk->has_ssn) 15381da177e4SLinus Torvalds return; 15391da177e4SLinus Torvalds 1540ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1541ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1542cee360abSXin Long stream = &chunk->asoc->stream; 1543ab3e5e7bSVlad Yasevich 1544ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1545ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1546ab3e5e7bSVlad Yasevich */ 1547ab3e5e7bSVlad Yasevich msg = chunk->msg; 1548ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1549ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 15501da177e4SLinus Torvalds ssn = 0; 15511da177e4SLinus Torvalds } else { 1552ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1553a8386317SXin Long ssn = sctp_ssn_next(stream, out, sid); 15541da177e4SLinus Torvalds else 1555a8386317SXin Long ssn = sctp_ssn_peek(stream, out, sid); 15561da177e4SLinus Torvalds } 15571da177e4SLinus Torvalds 1558ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1559ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1560ab3e5e7bSVlad Yasevich } 15611da177e4SLinus Torvalds } 15621da177e4SLinus Torvalds 15631da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15641da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15651da177e4SLinus Torvalds */ 15661da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 15671da177e4SLinus Torvalds { 15681da177e4SLinus Torvalds if (!chunk->has_tsn) { 15691da177e4SLinus Torvalds /* This is the last possible instant to 15701da177e4SLinus Torvalds * assign a TSN. 15711da177e4SLinus Torvalds */ 15721da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 15731da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 15741da177e4SLinus Torvalds chunk->has_tsn = 1; 15751da177e4SLinus Torvalds } 15761da177e4SLinus Torvalds } 15771da177e4SLinus Torvalds 15781da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 15791da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 15803182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1581dd0fc66fSAl Viro gfp_t gfp) 15821da177e4SLinus Torvalds { 15831da177e4SLinus Torvalds struct sctp_association *asoc; 15841c662018SXin Long enum sctp_scope scope; 15851da177e4SLinus Torvalds struct sk_buff *skb; 15861da177e4SLinus Torvalds 15871da177e4SLinus Torvalds /* Create the bare association. */ 15881da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 15891da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 15901da177e4SLinus Torvalds if (!asoc) 15911da177e4SLinus Torvalds goto nodata; 15921da177e4SLinus Torvalds asoc->temp = 1; 15931da177e4SLinus Torvalds skb = chunk->skb; 15941da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1595e7487c86SMarcelo Ricardo Leitner SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1); 1596e7487c86SMarcelo Ricardo Leitner 15971da177e4SLinus Torvalds nodata: 15981da177e4SLinus Torvalds return asoc; 15991da177e4SLinus Torvalds } 16001da177e4SLinus Torvalds 16011da177e4SLinus Torvalds /* Build a cookie representing asoc. 16021da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 16031da177e4SLinus Torvalds */ 1604f48ef4c7SXin Long static struct sctp_cookie_param *sctp_pack_cookie( 1605f48ef4c7SXin Long const struct sctp_endpoint *ep, 16061da177e4SLinus Torvalds const struct sctp_association *asoc, 16071da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 1608327c0dabSXin Long int *cookie_len, const __u8 *raw_addrs, 1609327c0dabSXin Long int addrs_len) 16101da177e4SLinus Torvalds { 16111da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 1612f48ef4c7SXin Long struct sctp_cookie_param *retval; 16131da177e4SLinus Torvalds int headersize, bodysize; 16141da177e4SLinus Torvalds 16159834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 16169834a2bbSVlad Yasevich * any padding. 16179834a2bbSVlad Yasevich */ 16183c918704SXin Long headersize = sizeof(struct sctp_paramhdr) + 16199834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 16209834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 16211da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 16221da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 16231da177e4SLinus Torvalds 16241da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 16251da177e4SLinus Torvalds * functions simpler to write. 16261da177e4SLinus Torvalds */ 16271da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 16281da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 16291da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 16301da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 16311da177e4SLinus Torvalds 16321da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 16331da177e4SLinus Torvalds * out on the network. 16341da177e4SLinus Torvalds */ 1635af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1636af997d8cSArnaldo Carvalho de Melo if (!retval) 1637af997d8cSArnaldo Carvalho de Melo goto nodata; 1638af997d8cSArnaldo Carvalho de Melo 16391da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 16401da177e4SLinus Torvalds 16411da177e4SLinus Torvalds /* Set up the parameter header. */ 16421da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 16431da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 16441da177e4SLinus Torvalds 16451da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 16461da177e4SLinus Torvalds cookie->c = asoc->c; 16471da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 16481da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 16491da177e4SLinus Torvalds 16501da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 16511da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 16521da177e4SLinus Torvalds 16530f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 16540f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 16551da177e4SLinus Torvalds 16561da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 165752db882fSDaniel Borkmann cookie->c.expiration = ktime_add(asoc->cookie_life, 1658cb5e173eSMarcelo Ricardo Leitner ktime_get_real()); 16591da177e4SLinus Torvalds 16601da177e4SLinus Torvalds /* Copy the peer's init packet. */ 16611da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 16621da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 16631da177e4SLinus Torvalds 16641da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 16651da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 16661da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 16671da177e4SLinus Torvalds 16681da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 16695821c769SHerbert Xu SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); 16705821c769SHerbert Xu int err; 16711b489e11SHerbert Xu 16721da177e4SLinus Torvalds /* Sign the message. */ 16735821c769SHerbert Xu desc->tfm = sctp_sk(ep->base.sk)->hmac; 16741da177e4SLinus Torvalds 16755821c769SHerbert Xu err = crypto_shash_setkey(desc->tfm, ep->secret_key, 16765821c769SHerbert Xu sizeof(ep->secret_key)) ?: 16775821c769SHerbert Xu crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize, 16785821c769SHerbert Xu cookie->signature); 16795821c769SHerbert Xu shash_desc_zero(desc); 16805821c769SHerbert Xu if (err) 16811b489e11SHerbert Xu goto free_cookie; 16821da177e4SLinus Torvalds } 16831da177e4SLinus Torvalds 16841da177e4SLinus Torvalds return retval; 16851b489e11SHerbert Xu 16861b489e11SHerbert Xu free_cookie: 16871b489e11SHerbert Xu kfree(retval); 16881b489e11SHerbert Xu nodata: 16891b489e11SHerbert Xu *cookie_len = 0; 16901b489e11SHerbert Xu return NULL; 16911da177e4SLinus Torvalds } 16921da177e4SLinus Torvalds 16931da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 16941da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 16951da177e4SLinus Torvalds const struct sctp_endpoint *ep, 16961da177e4SLinus Torvalds const struct sctp_association *asoc, 1697dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 16981da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 16991da177e4SLinus Torvalds { 17001da177e4SLinus Torvalds struct sctp_association *retval = NULL; 17011da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1702327c0dabSXin Long struct sctp_signed_cookie *cookie; 17031da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 1704327c0dabSXin Long struct sctp_cookie *bear_cookie; 1705327c0dabSXin Long __u8 *digest = ep->digest; 1706327c0dabSXin Long enum sctp_scope scope; 1707327c0dabSXin Long unsigned int len; 170852db882fSDaniel Borkmann ktime_t kt; 17091da177e4SLinus Torvalds 17109834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 17119834a2bbSVlad Yasevich * any padding. 17129834a2bbSVlad Yasevich */ 1713922dbc5bSXin Long headersize = sizeof(struct sctp_chunkhdr) + 17149834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 17159834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 17161da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 17171da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 17181da177e4SLinus Torvalds 17191da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 17201da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 17211da177e4SLinus Torvalds * INIT chunk. 17221da177e4SLinus Torvalds */ 17231da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17241da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 17251da177e4SLinus Torvalds goto malformed; 17261da177e4SLinus Torvalds 17271da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 17281da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 17291da177e4SLinus Torvalds goto malformed; 17301da177e4SLinus Torvalds 17311da177e4SLinus Torvalds /* Process the cookie. */ 17321da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 17331da177e4SLinus Torvalds bear_cookie = &cookie->c; 17341da177e4SLinus Torvalds 17351da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 17361da177e4SLinus Torvalds goto no_hmac; 17371da177e4SLinus Torvalds 17381da177e4SLinus Torvalds /* Check the signature. */ 17395821c769SHerbert Xu { 17405821c769SHerbert Xu SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); 17415821c769SHerbert Xu int err; 17421da177e4SLinus Torvalds 17435821c769SHerbert Xu desc->tfm = sctp_sk(ep->base.sk)->hmac; 17445821c769SHerbert Xu 17455821c769SHerbert Xu err = crypto_shash_setkey(desc->tfm, ep->secret_key, 17465821c769SHerbert Xu sizeof(ep->secret_key)) ?: 17475821c769SHerbert Xu crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize, 17485821c769SHerbert Xu digest); 17495821c769SHerbert Xu shash_desc_zero(desc); 17505821c769SHerbert Xu 17515821c769SHerbert Xu if (err) { 17521b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17531b489e11SHerbert Xu goto fail; 17541b489e11SHerbert Xu } 17555821c769SHerbert Xu } 17561da177e4SLinus Torvalds 17571da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 17581da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 17591da177e4SLinus Torvalds goto fail; 17601da177e4SLinus Torvalds } 17611da177e4SLinus Torvalds 17621da177e4SLinus Torvalds no_hmac: 17631da177e4SLinus Torvalds /* IG Section 2.35.2: 17641da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 17651da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 17661da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 17671da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 17681da177e4SLinus Torvalds * discarded, 17691da177e4SLinus Torvalds */ 17701da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 17711da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 17721da177e4SLinus Torvalds goto fail; 17731da177e4SLinus Torvalds } 17741da177e4SLinus Torvalds 17759b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 17761da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 17771da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 17781da177e4SLinus Torvalds goto fail; 17791da177e4SLinus Torvalds } 17801da177e4SLinus Torvalds 17811da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 17821da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 17831da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1784f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1785f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1786f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1787f236218bSVlad Yasevich * down the new association establishment instead of every packet. 17881da177e4SLinus Torvalds */ 1789f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 179052db882fSDaniel Borkmann kt = skb_get_ktime(skb); 1791f236218bSVlad Yasevich else 1792cb5e173eSMarcelo Ricardo Leitner kt = ktime_get_real(); 1793f236218bSVlad Yasevich 179467cb9366SDaniel Borkmann if (!asoc && ktime_before(bear_cookie->expiration, kt)) { 17958914f4baSMarcelo Ricardo Leitner suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); 17968914f4baSMarcelo Ricardo Leitner __be32 n = htonl(usecs); 17978914f4baSMarcelo Ricardo Leitner 17981da177e4SLinus Torvalds /* 17991da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 18001da177e4SLinus Torvalds * 18011da177e4SLinus Torvalds * Cause of error 18021da177e4SLinus Torvalds * --------------- 18031da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 18041da177e4SLinus Torvalds * Cookie that has expired. 18051da177e4SLinus Torvalds */ 18068914f4baSMarcelo Ricardo Leitner *errp = sctp_make_op_error(asoc, chunk, 18078914f4baSMarcelo Ricardo Leitner SCTP_ERROR_STALE_COOKIE, &n, 18088914f4baSMarcelo Ricardo Leitner sizeof(n), 0); 18098914f4baSMarcelo Ricardo Leitner if (*errp) 18101da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 18118914f4baSMarcelo Ricardo Leitner else 18121da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18131da177e4SLinus Torvalds 18141da177e4SLinus Torvalds goto fail; 18151da177e4SLinus Torvalds } 18161da177e4SLinus Torvalds 18171da177e4SLinus Torvalds /* Make a new base association. */ 18181da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 18191da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 18201da177e4SLinus Torvalds if (!retval) { 18211da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18221da177e4SLinus Torvalds goto fail; 18231da177e4SLinus Torvalds } 18241da177e4SLinus Torvalds 18251da177e4SLinus Torvalds /* Set up our peer's port number. */ 18261da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 18271da177e4SLinus Torvalds 18281da177e4SLinus Torvalds /* Populate the association from the cookie. */ 18291da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 18301da177e4SLinus Torvalds 18311da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 18321da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 18331da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18341da177e4SLinus Torvalds goto fail; 18351da177e4SLinus Torvalds } 18361da177e4SLinus Torvalds 18371da177e4SLinus Torvalds /* Also, add the destination address. */ 18381da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1839f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1840133800d1SMarcelo Ricardo Leitner sizeof(chunk->dest), SCTP_ADDR_SRC, 1841133800d1SMarcelo Ricardo Leitner GFP_ATOMIC); 18421da177e4SLinus Torvalds } 18431da177e4SLinus Torvalds 18441da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 18451da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 18461da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 1847cc16f00fSXin Long retval->strreset_outseq = retval->c.initial_tsn; 18481da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 18491da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 18500f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 18511da177e4SLinus Torvalds 18521da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 18531da177e4SLinus Torvalds return retval; 18541da177e4SLinus Torvalds 18551da177e4SLinus Torvalds fail: 18561da177e4SLinus Torvalds if (retval) 18571da177e4SLinus Torvalds sctp_association_free(retval); 18581da177e4SLinus Torvalds 18591da177e4SLinus Torvalds return NULL; 18601da177e4SLinus Torvalds 18611da177e4SLinus Torvalds malformed: 18621da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 18631da177e4SLinus Torvalds * malformed. 18641da177e4SLinus Torvalds */ 18651da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 18661da177e4SLinus Torvalds goto fail; 18671da177e4SLinus Torvalds } 18681da177e4SLinus Torvalds 18691da177e4SLinus Torvalds /******************************************************************** 18701da177e4SLinus Torvalds * 3rd Level Abstractions 18711da177e4SLinus Torvalds ********************************************************************/ 18721da177e4SLinus Torvalds 18731da177e4SLinus Torvalds struct __sctp_missing { 18749f81bcd9SAl Viro __be32 num_missing; 18759f81bcd9SAl Viro __be16 type; 1876bc10502dSEric Dumazet } __packed; 18771da177e4SLinus Torvalds 18781da177e4SLinus Torvalds /* 18791da177e4SLinus Torvalds * Report a missing mandatory parameter. 18801da177e4SLinus Torvalds */ 18811da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 188234b4e29bSXin Long enum sctp_param paramtype, 18831da177e4SLinus Torvalds struct sctp_chunk *chunk, 18841da177e4SLinus Torvalds struct sctp_chunk **errp) 18851da177e4SLinus Torvalds { 18861da177e4SLinus Torvalds struct __sctp_missing report; 18871da177e4SLinus Torvalds __u16 len; 18881da177e4SLinus Torvalds 1889e2f036a9SMarcelo Ricardo Leitner len = SCTP_PAD4(sizeof(report)); 18901da177e4SLinus Torvalds 18911da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 18921da177e4SLinus Torvalds * returning multiple unknown parameters. 18931da177e4SLinus Torvalds */ 18941da177e4SLinus Torvalds if (!*errp) 18951da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18961da177e4SLinus Torvalds 18971da177e4SLinus Torvalds if (*errp) { 18981da177e4SLinus Torvalds report.num_missing = htonl(1); 18991da177e4SLinus Torvalds report.type = paramtype; 1900ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 190100f1c2dfSWei Yongjun sizeof(report)); 190200f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 19031da177e4SLinus Torvalds } 19041da177e4SLinus Torvalds 19051da177e4SLinus Torvalds /* Stop processing this chunk. */ 19061da177e4SLinus Torvalds return 0; 19071da177e4SLinus Torvalds } 19081da177e4SLinus Torvalds 19091da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 19101da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 19111da177e4SLinus Torvalds struct sctp_chunk *chunk, 19121da177e4SLinus Torvalds struct sctp_chunk **errp) 19131da177e4SLinus Torvalds { 19141da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 19151da177e4SLinus Torvalds 19161da177e4SLinus Torvalds if (!*errp) 19171da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 19181da177e4SLinus Torvalds 19191da177e4SLinus Torvalds if (*errp) 192000f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 19211da177e4SLinus Torvalds 19221da177e4SLinus Torvalds /* Stop processing this chunk. */ 19231da177e4SLinus Torvalds return 0; 19241da177e4SLinus Torvalds } 19251da177e4SLinus Torvalds 19261da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 19271da177e4SLinus Torvalds struct sctp_paramhdr *param, 19281da177e4SLinus Torvalds const struct sctp_chunk *chunk, 19291da177e4SLinus Torvalds struct sctp_chunk **errp) 19301da177e4SLinus Torvalds { 19317ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 19327ab90804SVlad Yasevich * not reported. 19337ab90804SVlad Yasevich */ 19347ab90804SVlad Yasevich if (*errp) 19357ab90804SVlad Yasevich sctp_chunk_free(*errp); 19367ab90804SVlad Yasevich 19371da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1938ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 19391da177e4SLinus Torvalds 19401da177e4SLinus Torvalds return 0; 19411da177e4SLinus Torvalds } 19421da177e4SLinus Torvalds 19431da177e4SLinus Torvalds 19441da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 19451da177e4SLinus Torvalds * send back an indicator to the peer. 19461da177e4SLinus Torvalds */ 19471da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 19481da177e4SLinus Torvalds union sctp_params param, 19491da177e4SLinus Torvalds struct sctp_chunk *chunk, 19501da177e4SLinus Torvalds struct sctp_chunk **errp) 19511da177e4SLinus Torvalds { 19521da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 19531da177e4SLinus Torvalds 19547ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 19557ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 19567ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 19577ab90804SVlad Yasevich * them in the ABORT. 19587ab90804SVlad Yasevich */ 19597ab90804SVlad Yasevich if (*errp) 19607ab90804SVlad Yasevich sctp_chunk_free(*errp); 19617ab90804SVlad Yasevich 19628914f4baSMarcelo Ricardo Leitner *errp = sctp_make_op_error(asoc, chunk, SCTP_ERROR_DNS_FAILED, 19638914f4baSMarcelo Ricardo Leitner param.v, len, 0); 19641da177e4SLinus Torvalds 19651da177e4SLinus Torvalds /* Stop processing this chunk. */ 19661da177e4SLinus Torvalds return 0; 19671da177e4SLinus Torvalds } 19681da177e4SLinus Torvalds 19694e27428fSXin Long static int sctp_verify_ext_param(struct net *net, 19704e27428fSXin Long const struct sctp_endpoint *ep, 19714e27428fSXin Long union sctp_params param) 1972d6701191SVlad Yasevich { 19733c918704SXin Long __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 1974d6701191SVlad Yasevich int have_asconf = 0; 1975327c0dabSXin Long int have_auth = 0; 1976d6701191SVlad Yasevich int i; 1977d6701191SVlad Yasevich 1978d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 1979d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 1980d6701191SVlad Yasevich case SCTP_CID_AUTH: 1981d6701191SVlad Yasevich have_auth = 1; 1982d6701191SVlad Yasevich break; 1983d6701191SVlad Yasevich case SCTP_CID_ASCONF: 1984d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 1985d6701191SVlad Yasevich have_asconf = 1; 1986d6701191SVlad Yasevich break; 1987d6701191SVlad Yasevich } 1988d6701191SVlad Yasevich } 1989d6701191SVlad Yasevich 1990d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 1991d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 1992d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 1993d6701191SVlad Yasevich * mode. 1994d6701191SVlad Yasevich */ 1995e1fc3b14SEric W. Biederman if (net->sctp.addip_noauth) 1996d6701191SVlad Yasevich return 1; 1997d6701191SVlad Yasevich 19984e27428fSXin Long if (ep->asconf_enable && !have_auth && have_asconf) 1999d6701191SVlad Yasevich return 0; 2000d6701191SVlad Yasevich 2001d6701191SVlad Yasevich return 1; 2002d6701191SVlad Yasevich } 2003d6701191SVlad Yasevich 2004131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 2005131a47e3SVlad Yasevich union sctp_params param) 2006131a47e3SVlad Yasevich { 20073c918704SXin Long __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 2008131a47e3SVlad Yasevich int i; 2009131a47e3SVlad Yasevich 2010131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 2011131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 2012c28445c3SXin Long case SCTP_CID_RECONF: 2013a96701fbSXin Long if (asoc->ep->reconf_enable) 2014c28445c3SXin Long asoc->peer.reconf_capable = 1; 2015c28445c3SXin Long break; 2016131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 20171c134753SXin Long if (asoc->ep->prsctp_enable) 2018131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 2019131a47e3SVlad Yasevich break; 2020730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 2021730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 2022730fc3d0SVlad Yasevich * supports AUTH. 2023730fc3d0SVlad Yasevich */ 2024b14878ccSVlad Yasevich if (asoc->ep->auth_enable) 2025730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 2026730fc3d0SVlad Yasevich break; 2027131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 2028131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 20294e27428fSXin Long if (asoc->ep->asconf_enable) 203088799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 20316b2f9cb6SVlad Yasevich break; 203296b120b3SXin Long case SCTP_CID_I_DATA: 2033e55f4b8bSXin Long if (asoc->ep->intl_enable) 2034da1f6d4dSXin Long asoc->peer.intl_capable = 1; 203596b120b3SXin Long break; 2036131a47e3SVlad Yasevich default: 2037131a47e3SVlad Yasevich break; 2038131a47e3SVlad Yasevich } 2039131a47e3SVlad Yasevich } 2040131a47e3SVlad Yasevich } 2041131a47e3SVlad Yasevich 20421da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 20431da177e4SLinus Torvalds * 20441da177e4SLinus Torvalds * The Parameter Types are encoded such that the 20451da177e4SLinus Torvalds * highest-order two bits specify the action that must be 20461da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 20471da177e4SLinus Torvalds * Parameter Type. 20481da177e4SLinus Torvalds * 20497ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 20507ab90804SVlad Yasevich * parameters within this chunk 20511da177e4SLinus Torvalds * 20527ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 20537ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 20547ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 20551da177e4SLinus Torvalds * 20561da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 20571da177e4SLinus Torvalds * 20581da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 20591da177e4SLinus Torvalds * report the unrecognized parameter in an 20607ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 20611da177e4SLinus Torvalds * 20621da177e4SLinus Torvalds * Return value: 20637ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20647ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 20657ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 20661da177e4SLinus Torvalds */ 20674785c7aeSXin Long static enum sctp_ierror sctp_process_unk_param( 20684785c7aeSXin Long const struct sctp_association *asoc, 20691da177e4SLinus Torvalds union sctp_params param, 20701da177e4SLinus Torvalds struct sctp_chunk *chunk, 20711da177e4SLinus Torvalds struct sctp_chunk **errp) 20721da177e4SLinus Torvalds { 20737ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 20741da177e4SLinus Torvalds 20751da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 20761da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 20777ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20781da177e4SLinus Torvalds break; 20791da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 20801da177e4SLinus Torvalds break; 20817ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 20827ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20837ab90804SVlad Yasevich /* Fall through */ 20841da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 20851da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 20861da177e4SLinus Torvalds * returning multiple unknown parameters. 20871da177e4SLinus Torvalds */ 20888914f4baSMarcelo Ricardo Leitner if (!*errp) { 20898914f4baSMarcelo Ricardo Leitner *errp = sctp_make_op_error_limited(asoc, chunk); 20908914f4baSMarcelo Ricardo Leitner if (!*errp) { 20918914f4baSMarcelo Ricardo Leitner /* If there is no memory for generating the 20928914f4baSMarcelo Ricardo Leitner * ERROR report as specified, an ABORT will be 20938914f4baSMarcelo Ricardo Leitner * triggered to the peer and the association 20948914f4baSMarcelo Ricardo Leitner * won't be established. 20951da177e4SLinus Torvalds */ 20967ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 20978914f4baSMarcelo Ricardo Leitner break; 20981da177e4SLinus Torvalds } 20998914f4baSMarcelo Ricardo Leitner } 21008914f4baSMarcelo Ricardo Leitner 21018914f4baSMarcelo Ricardo Leitner if (!sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, 21028914f4baSMarcelo Ricardo Leitner ntohs(param.p->length))) 21038914f4baSMarcelo Ricardo Leitner sctp_addto_chunk(*errp, ntohs(param.p->length), 21048914f4baSMarcelo Ricardo Leitner param.v); 21051da177e4SLinus Torvalds break; 21061da177e4SLinus Torvalds default: 21071da177e4SLinus Torvalds break; 21081da177e4SLinus Torvalds } 21091da177e4SLinus Torvalds 21101da177e4SLinus Torvalds return retval; 21111da177e4SLinus Torvalds } 21121da177e4SLinus Torvalds 21137ab90804SVlad Yasevich /* Verify variable length parameters 21141da177e4SLinus Torvalds * Return values: 21157ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 21167ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 21177ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 21187ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 21191da177e4SLinus Torvalds */ 21204785c7aeSXin Long static enum sctp_ierror sctp_verify_param(struct net *net, 2121b14878ccSVlad Yasevich const struct sctp_endpoint *ep, 2122f53b5b09SEric W. Biederman const struct sctp_association *asoc, 21231da177e4SLinus Torvalds union sctp_params param, 21246d85e68fSXin Long enum sctp_cid cid, 21251da177e4SLinus Torvalds struct sctp_chunk *chunk, 21261da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 21271da177e4SLinus Torvalds { 212872da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 21297ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 213072da7b38SWei Yongjun __u16 n_elt, id = 0; 213172da7b38SWei Yongjun int i; 21321da177e4SLinus Torvalds 21331da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 21341da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 21351da177e4SLinus Torvalds * identified based on the chunk id. 21361da177e4SLinus Torvalds */ 21371da177e4SLinus Torvalds 21381da177e4SLinus Torvalds switch (param.p->type) { 21391da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 21401da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 21411da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 21421da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 21431da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 21441da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 21451da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 21461da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 21470f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2148d6701191SVlad Yasevich break; 2149d6701191SVlad Yasevich 2150131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 21514e27428fSXin Long if (!sctp_verify_ext_param(net, ep, param)) 2152d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 21531da177e4SLinus Torvalds break; 21541da177e4SLinus Torvalds 2155d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 21564e27428fSXin Long if (ep->asconf_enable) 2157d6de3097SVlad Yasevich break; 215848f9bcf9SJoe Perches goto unhandled; 2159d6de3097SVlad Yasevich 21601da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 21611da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 21627ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 21637ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21647ab90804SVlad Yasevich break; 2165131a47e3SVlad Yasevich 21661da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 216728aa4c26SXin Long if (ep->prsctp_enable) 21681da177e4SLinus Torvalds break; 216948f9bcf9SJoe Perches goto unhandled; 2170730fc3d0SVlad Yasevich 2171730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2172b14878ccSVlad Yasevich if (!ep->auth_enable) 217348f9bcf9SJoe Perches goto unhandled; 2174730fc3d0SVlad Yasevich 2175730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2176730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2177730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2178730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2179730fc3d0SVlad Yasevich */ 21808914f4baSMarcelo Ricardo Leitner if (SCTP_AUTH_RANDOM_LENGTH != ntohs(param.p->length) - 21818914f4baSMarcelo Ricardo Leitner sizeof(struct sctp_paramhdr)) { 21827ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2183730fc3d0SVlad Yasevich chunk, err_chunk); 21847ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21857ab90804SVlad Yasevich } 2186730fc3d0SVlad Yasevich break; 2187730fc3d0SVlad Yasevich 2188730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2189b14878ccSVlad Yasevich if (!ep->auth_enable) 219048f9bcf9SJoe Perches goto unhandled; 2191730fc3d0SVlad Yasevich 2192730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2193730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2194730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2195730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2196730fc3d0SVlad Yasevich */ 21977ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 21987ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2199730fc3d0SVlad Yasevich chunk, err_chunk); 22007ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 22017ab90804SVlad Yasevich } 2202730fc3d0SVlad Yasevich break; 2203730fc3d0SVlad Yasevich 2204730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2205b14878ccSVlad Yasevich if (!ep->auth_enable) 220648f9bcf9SJoe Perches goto unhandled; 220772da7b38SWei Yongjun 220872da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 22093c918704SXin Long n_elt = (ntohs(param.p->length) - 22103c918704SXin Long sizeof(struct sctp_paramhdr)) >> 1; 221172da7b38SWei Yongjun 221272da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 221372da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 221472da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 221572da7b38SWei Yongjun */ 221672da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 221772da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 221872da7b38SWei Yongjun 221972da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2220730fc3d0SVlad Yasevich break; 222172da7b38SWei Yongjun } 222272da7b38SWei Yongjun 222372da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 222472da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 222572da7b38SWei Yongjun err_chunk); 222672da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 222772da7b38SWei Yongjun } 222872da7b38SWei Yongjun break; 222948f9bcf9SJoe Perches unhandled: 22301da177e4SLinus Torvalds default: 2231bb33381dSDaniel Borkmann pr_debug("%s: unrecognized param:%d for chunk:%d\n", 2232bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), cid); 2233bb33381dSDaniel Borkmann 22347ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 22351da177e4SLinus Torvalds break; 22361da177e4SLinus Torvalds } 22371da177e4SLinus Torvalds return retval; 22381da177e4SLinus Torvalds } 22391da177e4SLinus Torvalds 22401da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 2241b14878ccSVlad Yasevich int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 22426d85e68fSXin Long const struct sctp_association *asoc, enum sctp_cid cid, 224301a992beSXin Long struct sctp_init_chunk *peer_init, 224401a992beSXin Long struct sctp_chunk *chunk, struct sctp_chunk **errp) 22451da177e4SLinus Torvalds { 22461da177e4SLinus Torvalds union sctp_params param; 22477613f5feSDaniel Borkmann bool has_cookie = false; 22487ab90804SVlad Yasevich int result; 22491da177e4SLinus Torvalds 22507613f5feSDaniel Borkmann /* Check for missing mandatory parameters. Note: Initial TSN is 22517613f5feSDaniel Borkmann * also mandatory, but is not checked here since the valid range 22527613f5feSDaniel Borkmann * is 0..2**32-1. RFC4960, section 3.3.3. 22537613f5feSDaniel Borkmann */ 22547613f5feSDaniel Borkmann if (peer_init->init_hdr.num_outbound_streams == 0 || 22557613f5feSDaniel Borkmann peer_init->init_hdr.num_inbound_streams == 0 || 22567613f5feSDaniel Borkmann peer_init->init_hdr.init_tag == 0 || 22577613f5feSDaniel Borkmann ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) 22587ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 22591da177e4SLinus Torvalds 22601da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22617613f5feSDaniel Borkmann if (param.p->type == SCTP_PARAM_STATE_COOKIE) 22627613f5feSDaniel Borkmann has_cookie = true; 22637613f5feSDaniel Borkmann } 22641da177e4SLinus Torvalds 22651da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 22661da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 22671da177e4SLinus Torvalds * The current param.p would point at the bad one. 22681da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 22691da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 22701da177e4SLinus Torvalds * error handling code build and send the packet. 22711da177e4SLinus Torvalds */ 22727ab90804SVlad Yasevich if (param.v != (void *)chunk->chunk_end) 22737ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 22741da177e4SLinus Torvalds 22751da177e4SLinus Torvalds /* The only missing mandatory param possible today is 22761da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 22771da177e4SLinus Torvalds */ 22787ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 22797ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 22801da177e4SLinus Torvalds chunk, errp); 22811da177e4SLinus Torvalds 22827ab90804SVlad Yasevich /* Verify all the variable length parameters */ 22831da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2284b14878ccSVlad Yasevich result = sctp_verify_param(net, ep, asoc, param, cid, 2285b14878ccSVlad Yasevich chunk, errp); 22867ab90804SVlad Yasevich switch (result) { 22877ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 22887ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 22891da177e4SLinus Torvalds return 0; 22907ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 22911da177e4SLinus Torvalds return 1; 22927ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 22937ab90804SVlad Yasevich default: 22947ab90804SVlad Yasevich break; 22951da177e4SLinus Torvalds } 22961da177e4SLinus Torvalds 22971da177e4SLinus Torvalds } /* for (loop through all parameters) */ 22981da177e4SLinus Torvalds 22991da177e4SLinus Torvalds return 1; 23001da177e4SLinus Torvalds } 23011da177e4SLinus Torvalds 23021da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 23031da177e4SLinus Torvalds * Returns 0 on failure, else success. 23041da177e4SLinus Torvalds * FIXME: This is an association method. 23051da177e4SLinus Torvalds */ 2306de6becdcSWei Yongjun int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, 23071da177e4SLinus Torvalds const union sctp_addr *peer_addr, 230801a992beSXin Long struct sctp_init_chunk *peer_init, gfp_t gfp) 23091da177e4SLinus Torvalds { 23101da177e4SLinus Torvalds struct sctp_transport *transport; 23111da177e4SLinus Torvalds struct list_head *pos, *temp; 2312327c0dabSXin Long union sctp_params param; 2313de6becdcSWei Yongjun union sctp_addr addr; 2314327c0dabSXin Long struct sctp_af *af; 2315de6becdcSWei Yongjun int src_match = 0; 23161da177e4SLinus Torvalds 23171da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 23181da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 23191da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 23201da177e4SLinus Torvalds * of the INIT from the cookie. 23211da177e4SLinus Torvalds */ 23221da177e4SLinus Torvalds 23231da177e4SLinus Torvalds /* This implementation defaults to making the first transport 23241da177e4SLinus Torvalds * added as the primary transport. The source address seems to 23251da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 23261da177e4SLinus Torvalds */ 23276a1e5f33SAl Viro if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 23281da177e4SLinus Torvalds goto nomem; 2329de6becdcSWei Yongjun 2330de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) 2331de6becdcSWei Yongjun src_match = 1; 23321da177e4SLinus Torvalds 23331da177e4SLinus Torvalds /* Process the initialization parameters. */ 23341da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2335de6becdcSWei Yongjun if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 2336de6becdcSWei Yongjun param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { 2337de6becdcSWei Yongjun af = sctp_get_af_specific(param_type2af(param.p->type)); 2338de6becdcSWei Yongjun af->from_addr_param(&addr, param.addr, 2339de6becdcSWei Yongjun chunk->sctp_hdr->source, 0); 2340de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) 2341de6becdcSWei Yongjun src_match = 1; 2342de6becdcSWei Yongjun } 23431da177e4SLinus Torvalds 23441da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 23451da177e4SLinus Torvalds goto clean_up; 23461da177e4SLinus Torvalds } 23471da177e4SLinus Torvalds 2348de6becdcSWei Yongjun /* source address of chunk may not match any valid address */ 2349de6becdcSWei Yongjun if (!src_match) 2350de6becdcSWei Yongjun goto clean_up; 2351de6becdcSWei Yongjun 2352730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2353730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2354730fc3d0SVlad Yasevich */ 2355730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2356730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2357730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2358730fc3d0SVlad Yasevich 2359d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2360d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2361d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2362d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2363d6701191SVlad Yasevich * is what we'll do here. 23646b2f9cb6SVlad Yasevich */ 23654e7696d9SXin Long if (!asoc->base.net->sctp.addip_noauth && 236673d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 23676b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 23686b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 23696b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 237088799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2371d6701191SVlad Yasevich goto clean_up; 23726b2f9cb6SVlad Yasevich } 23736b2f9cb6SVlad Yasevich 23743f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 23753f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 23763f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 23773f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 23783f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 23793f7a87d2SFrank Filz } 23803f7a87d2SFrank Filz } 23813f7a87d2SFrank Filz 23821da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 23831da177e4SLinus Torvalds * order. 23841da177e4SLinus Torvalds */ 23851da177e4SLinus Torvalds asoc->peer.i.init_tag = 23861da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 23871da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 23881da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 23891da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 23901da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 23911da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 23921da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 23931da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 23941da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 23951da177e4SLinus Torvalds 2396cc16f00fSXin Long asoc->strreset_inseq = asoc->peer.i.initial_tsn; 2397cc16f00fSXin Long 23981da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 23991da177e4SLinus Torvalds * number of inbound streams. 24001da177e4SLinus Torvalds */ 24011da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 24021da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 24031da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 24041da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 24051da177e4SLinus Torvalds } 24061da177e4SLinus Torvalds 24071da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 24081da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 24091da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 24101da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 24111da177e4SLinus Torvalds } 24121da177e4SLinus Torvalds 24131da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 24141da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 24151da177e4SLinus Torvalds 24161da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 24171da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 24181da177e4SLinus Torvalds 24191da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 24201da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 24211da177e4SLinus Torvalds * advertised window). 24221da177e4SLinus Torvalds */ 24239dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 24249dbc15f0SRobert P. J. Day transports) { 24251da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 24261da177e4SLinus Torvalds } 24271da177e4SLinus Torvalds 24281da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 24298e1ee18cSVlad Yasevich if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 24308e1ee18cSVlad Yasevich asoc->peer.i.initial_tsn, gfp)) 24318e1ee18cSVlad Yasevich goto clean_up; 24321da177e4SLinus Torvalds 24331da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 24341da177e4SLinus Torvalds * 24351da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 24361da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 24371da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 24381da177e4SLinus Torvalds * stream sequence number shall be set to 0. 24391da177e4SLinus Torvalds */ 24401da177e4SLinus Torvalds 2441ff356414SXin Long if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams, 2442ff356414SXin Long asoc->c.sinit_max_instreams, gfp)) 24431da177e4SLinus Torvalds goto clean_up; 24441da177e4SLinus Torvalds 24454135cce7SXin Long /* Update frag_point when stream_interleave may get changed. */ 24464135cce7SXin Long sctp_assoc_update_frag_point(asoc); 24474135cce7SXin Long 24487e062977SXin Long if (!asoc->temp && sctp_assoc_set_id(asoc, gfp)) 24491da177e4SLinus Torvalds goto clean_up; 24501da177e4SLinus Torvalds 24511da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 24521da177e4SLinus Torvalds * 24531da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 24541da177e4SLinus Torvalds * remote endpoint it should do the following: 24551da177e4SLinus Torvalds * ... 24561da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 24571da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 24581da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 24591da177e4SLinus Torvalds * association to the same value as the Initial TSN. 24601da177e4SLinus Torvalds */ 24611da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 24621da177e4SLinus Torvalds return 1; 24631da177e4SLinus Torvalds 24641da177e4SLinus Torvalds clean_up: 24651da177e4SLinus Torvalds /* Release the transport structures. */ 24661da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 24671da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2468add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2469add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 24701da177e4SLinus Torvalds } 24713f7a87d2SFrank Filz 24721da177e4SLinus Torvalds nomem: 24731da177e4SLinus Torvalds return 0; 24741da177e4SLinus Torvalds } 24751da177e4SLinus Torvalds 24761da177e4SLinus Torvalds 24771da177e4SLinus Torvalds /* Update asoc with the option described in param. 24781da177e4SLinus Torvalds * 24791da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 24801da177e4SLinus Torvalds * 24811da177e4SLinus Torvalds * asoc is the association to update. 24821da177e4SLinus Torvalds * param is the variable length parameter to use for update. 24831da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 24841da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 24851da177e4SLinus Torvalds * work we do. In particular, we should not build transport 24861da177e4SLinus Torvalds * structures for the addresses. 24871da177e4SLinus Torvalds */ 24881da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 24891da177e4SLinus Torvalds union sctp_params param, 24901da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2491dd0fc66fSAl Viro gfp_t gfp) 24921da177e4SLinus Torvalds { 2493327c0dabSXin Long struct sctp_endpoint *ep = asoc->ep; 2494d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 24954e7696d9SXin Long struct net *net = asoc->base.net; 2496d6de3097SVlad Yasevich struct sctp_transport *t; 2497327c0dabSXin Long enum sctp_scope scope; 2498327c0dabSXin Long union sctp_addr addr; 2499327c0dabSXin Long struct sctp_af *af; 2500327c0dabSXin Long int retval = 1, i; 2501327c0dabSXin Long u32 stale; 2502327c0dabSXin Long __u16 sat; 25031da177e4SLinus Torvalds 25041da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 25051da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 25061da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 25071da177e4SLinus Torvalds */ 25081da177e4SLinus Torvalds switch (param.p->type) { 25091da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25101da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 25111da177e4SLinus Torvalds break; 25127dab83deSVlad Yasevich goto do_addr_param; 25137dab83deSVlad Yasevich 25141da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25157dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 25167dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 25177dab83deSVlad Yasevich break; 25187dab83deSVlad Yasevich do_addr_param: 25191da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2520dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 25211da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2522e7ff4a70SEric W. Biederman if (sctp_in_scope(net, &addr, scope)) 2523dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 25241da177e4SLinus Torvalds return 0; 25251da177e4SLinus Torvalds break; 25261da177e4SLinus Torvalds 25271da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 2528e1fc3b14SEric W. Biederman if (!net->sctp.cookie_preserve_enable) 25291da177e4SLinus Torvalds break; 25301da177e4SLinus Torvalds 25311da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 25321da177e4SLinus Torvalds 25331da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 25341da177e4SLinus Torvalds * (1/1000sec). 25351da177e4SLinus Torvalds */ 253652db882fSDaniel Borkmann asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); 25371da177e4SLinus Torvalds break; 25381da177e4SLinus Torvalds 25391da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 2540bb33381dSDaniel Borkmann pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); 25411da177e4SLinus Torvalds break; 25421da177e4SLinus Torvalds 25431da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 25441da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 25451da177e4SLinus Torvalds * ones are really set by the peer. 25461da177e4SLinus Torvalds */ 25471da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 25481da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 25491da177e4SLinus Torvalds 2550140ee960SGui Jianfeng /* Assume that peer supports the address family 2551140ee960SGui Jianfeng * by which it sends a packet. 2552140ee960SGui Jianfeng */ 2553140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2554140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2555140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2556140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2557140ee960SGui Jianfeng 25581da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 25593c918704SXin Long sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 25601da177e4SLinus Torvalds if (sat) 25611da177e4SLinus Torvalds sat /= sizeof(__u16); 25621da177e4SLinus Torvalds 25631da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 25641da177e4SLinus Torvalds switch (param.sat->types[i]) { 25651da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25661da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 25671da177e4SLinus Torvalds break; 25681da177e4SLinus Torvalds 25691da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25706e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 25711da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 25721da177e4SLinus Torvalds break; 25731da177e4SLinus Torvalds 25741da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 25751da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 25761da177e4SLinus Torvalds break; 25771da177e4SLinus Torvalds 25781da177e4SLinus Torvalds default: /* Just ignore anything else. */ 25791da177e4SLinus Torvalds break; 25803ff50b79SStephen Hemminger } 25811da177e4SLinus Torvalds } 25821da177e4SLinus Torvalds break; 25831da177e4SLinus Torvalds 25841da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 25851da177e4SLinus Torvalds asoc->peer.cookie_len = 25863c918704SXin Long ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 2587ce950f10SNeil Horman kfree(asoc->peer.cookie); 25880a8dd9f6SNeil Horman asoc->peer.cookie = kmemdup(param.cookie->body, asoc->peer.cookie_len, gfp); 25890a8dd9f6SNeil Horman if (!asoc->peer.cookie) 25900a8dd9f6SNeil Horman retval = 0; 25911da177e4SLinus Torvalds break; 25921da177e4SLinus Torvalds 25931da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 25941da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 25951da177e4SLinus Torvalds break; 25961da177e4SLinus Torvalds 25971da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 25981da177e4SLinus Torvalds /* Rejected during verify stage. */ 25991da177e4SLinus Torvalds break; 26001da177e4SLinus Torvalds 26011da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 26021b0b8114SXin Long if (asoc->ep->ecn_enable) { 26031da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 26041da177e4SLinus Torvalds break; 26051b0b8114SXin Long } 26061b0b8114SXin Long /* Fall Through */ 26071b0b8114SXin Long goto fall_through; 26081b0b8114SXin Long 26091da177e4SLinus Torvalds 26100f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2611e69c4e0fSVlad Yasevich asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); 26121da177e4SLinus Torvalds break; 26131da177e4SLinus Torvalds 2614d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 26154e27428fSXin Long if (!ep->asconf_enable) 26160ef46e28SVlad Yasevich goto fall_through; 26170ef46e28SVlad Yasevich 26188b32f234SXin Long addr_param = param.v + sizeof(struct sctp_addip_param); 2619d6de3097SVlad Yasevich 2620cfbf654eSSaran Maruti Ramanara af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 2621e40607cbSDaniel Borkmann if (af == NULL) 2622e40607cbSDaniel Borkmann break; 2623e40607cbSDaniel Borkmann 2624d6de3097SVlad Yasevich af->from_addr_param(&addr, addr_param, 2625d6de3097SVlad Yasevich htons(asoc->peer.port), 0); 2626d6de3097SVlad Yasevich 2627d6de3097SVlad Yasevich /* if the address is invalid, we can't process it. 2628d6de3097SVlad Yasevich * XXX: see spec for what to do. 2629d6de3097SVlad Yasevich */ 2630d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2631d6de3097SVlad Yasevich break; 2632d6de3097SVlad Yasevich 2633d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2634d6de3097SVlad Yasevich if (!t) 2635d6de3097SVlad Yasevich break; 2636d6de3097SVlad Yasevich 2637d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2638d6de3097SVlad Yasevich break; 2639d6de3097SVlad Yasevich 2640131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2641131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2642131a47e3SVlad Yasevich break; 2643131a47e3SVlad Yasevich 26441da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 26451c134753SXin Long if (asoc->ep->prsctp_enable) { 26461da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 26471da177e4SLinus Torvalds break; 26481da177e4SLinus Torvalds } 26491da177e4SLinus Torvalds /* Fall Through */ 2650730fc3d0SVlad Yasevich goto fall_through; 2651730fc3d0SVlad Yasevich 2652730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2653b14878ccSVlad Yasevich if (!ep->auth_enable) 2654730fc3d0SVlad Yasevich goto fall_through; 2655730fc3d0SVlad Yasevich 2656730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2657ce950f10SNeil Horman kfree(asoc->peer.peer_random); 2658730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2659730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2660730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2661730fc3d0SVlad Yasevich retval = 0; 2662730fc3d0SVlad Yasevich break; 2663730fc3d0SVlad Yasevich } 2664730fc3d0SVlad Yasevich break; 2665730fc3d0SVlad Yasevich 2666730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2667b14878ccSVlad Yasevich if (!ep->auth_enable) 2668730fc3d0SVlad Yasevich goto fall_through; 2669730fc3d0SVlad Yasevich 2670730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2671ce950f10SNeil Horman kfree(asoc->peer.peer_hmacs); 2672730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2673730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2674730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2675730fc3d0SVlad Yasevich retval = 0; 2676730fc3d0SVlad Yasevich break; 2677730fc3d0SVlad Yasevich } 2678730fc3d0SVlad Yasevich 2679730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2680730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2681730fc3d0SVlad Yasevich break; 2682730fc3d0SVlad Yasevich 2683730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2684b14878ccSVlad Yasevich if (!ep->auth_enable) 2685730fc3d0SVlad Yasevich goto fall_through; 2686730fc3d0SVlad Yasevich 2687ce950f10SNeil Horman kfree(asoc->peer.peer_chunks); 2688730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2689730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2690730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2691730fc3d0SVlad Yasevich retval = 0; 2692730fc3d0SVlad Yasevich break; 2693730fc3d0SVlad Yasevich fall_through: 26941da177e4SLinus Torvalds default: 26951da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 26961da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 26971da177e4SLinus Torvalds * called prior to this routine. Simply log the error 26981da177e4SLinus Torvalds * here. 26991da177e4SLinus Torvalds */ 2700bb33381dSDaniel Borkmann pr_debug("%s: ignoring param:%d for association:%p.\n", 2701bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), asoc); 27021da177e4SLinus Torvalds break; 27033ff50b79SStephen Hemminger } 27041da177e4SLinus Torvalds 27051da177e4SLinus Torvalds return retval; 27061da177e4SLinus Torvalds } 27071da177e4SLinus Torvalds 27081da177e4SLinus Torvalds /* Select a new verification tag. */ 27091da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 27101da177e4SLinus Torvalds { 27111da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 27121da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 27131da177e4SLinus Torvalds */ 27141da177e4SLinus Torvalds __u32 x; 27151da177e4SLinus Torvalds 27161da177e4SLinus Torvalds do { 27171da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 27181da177e4SLinus Torvalds } while (x == 0); 27191da177e4SLinus Torvalds 27201da177e4SLinus Torvalds return x; 27211da177e4SLinus Torvalds } 27221da177e4SLinus Torvalds 27231da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 27241da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 27251da177e4SLinus Torvalds { 27261da177e4SLinus Torvalds __u32 retval; 27271da177e4SLinus Torvalds 27281da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 27291da177e4SLinus Torvalds return retval; 27301da177e4SLinus Torvalds } 27311da177e4SLinus Torvalds 27321da177e4SLinus Torvalds /* 27331da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 27341da177e4SLinus Torvalds * 0 1 2 3 27351da177e4SLinus 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 27361da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27371da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 27381da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27391da177e4SLinus Torvalds * | Serial Number | 27401da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27411da177e4SLinus Torvalds * | Address Parameter | 27421da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27431da177e4SLinus Torvalds * | ASCONF Parameter #1 | 27441da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27451da177e4SLinus Torvalds * \ \ 27461da177e4SLinus Torvalds * / .... / 27471da177e4SLinus Torvalds * \ \ 27481da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27491da177e4SLinus Torvalds * | ASCONF Parameter #N | 27501da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27511da177e4SLinus Torvalds * 27521da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 27531da177e4SLinus Torvalds */ 27541da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 27551da177e4SLinus Torvalds union sctp_addr *addr, 27561da177e4SLinus Torvalds int vparam_len) 27571da177e4SLinus Torvalds { 275865205cc4SXin Long struct sctp_addiphdr asconf; 27591da177e4SLinus Torvalds struct sctp_chunk *retval; 27601da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 27611da177e4SLinus Torvalds union sctp_addr_param addrparam; 27621da177e4SLinus Torvalds int addrlen; 27631da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 27641da177e4SLinus Torvalds 27651da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 27661da177e4SLinus Torvalds if (!addrlen) 27671da177e4SLinus Torvalds return NULL; 27681da177e4SLinus Torvalds length += addrlen; 27691da177e4SLinus Torvalds 27701da177e4SLinus Torvalds /* Create the chunk. */ 2771cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length, 2772cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 27731da177e4SLinus Torvalds if (!retval) 27741da177e4SLinus Torvalds return NULL; 27751da177e4SLinus Torvalds 27761da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 27771da177e4SLinus Torvalds 27781da177e4SLinus Torvalds retval->subh.addip_hdr = 27791da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 27801da177e4SLinus Torvalds retval->param_hdr.v = 27811da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 27821da177e4SLinus Torvalds 27831da177e4SLinus Torvalds return retval; 27841da177e4SLinus Torvalds } 27851da177e4SLinus Torvalds 27861da177e4SLinus Torvalds /* ADDIP 27871da177e4SLinus Torvalds * 3.2.1 Add IP Address 27881da177e4SLinus Torvalds * 0 1 2 3 27891da177e4SLinus 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 27901da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27911da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 27921da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27931da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27941da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27951da177e4SLinus Torvalds * | Address Parameter | 27961da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27971da177e4SLinus Torvalds * 27981da177e4SLinus Torvalds * 3.2.2 Delete IP Address 27991da177e4SLinus Torvalds * 0 1 2 3 28001da177e4SLinus 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 28011da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28021da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 28031da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28041da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28051da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28061da177e4SLinus Torvalds * | Address Parameter | 28071da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28081da177e4SLinus Torvalds * 28091da177e4SLinus Torvalds */ 28101da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 28111da177e4SLinus Torvalds union sctp_addr *laddr, 28121da177e4SLinus Torvalds struct sockaddr *addrs, 2813327c0dabSXin Long int addrcnt, __be16 flags) 28141da177e4SLinus Torvalds { 28151da177e4SLinus Torvalds union sctp_addr_param addr_param; 2816327c0dabSXin Long struct sctp_addip_param param; 28171da177e4SLinus Torvalds int paramlen = sizeof(param); 2818327c0dabSXin Long struct sctp_chunk *retval; 28191da177e4SLinus Torvalds int addr_param_len = 0; 2820327c0dabSXin Long union sctp_addr *addr; 2821327c0dabSXin Long int totallen = 0, i; 28228a07eb0aSMichio Honda int del_pickup = 0; 2823327c0dabSXin Long struct sctp_af *af; 2824327c0dabSXin Long void *addr_buf; 28251da177e4SLinus Torvalds 28261da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 28271da177e4SLinus Torvalds addr_buf = addrs; 28281da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2829ea110733SJoe Perches addr = addr_buf; 28301da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28311da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28321da177e4SLinus Torvalds 28331da177e4SLinus Torvalds totallen += paramlen; 28341da177e4SLinus Torvalds totallen += addr_param_len; 28351da177e4SLinus Torvalds 28361da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28378a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending && !del_pickup) { 28388a07eb0aSMichio Honda /* reuse the parameter length from the same scope one */ 28398a07eb0aSMichio Honda totallen += paramlen; 28408a07eb0aSMichio Honda totallen += addr_param_len; 28418a07eb0aSMichio Honda del_pickup = 1; 2842bb33381dSDaniel Borkmann 2843bb33381dSDaniel Borkmann pr_debug("%s: picked same-scope del_pending addr, " 2844bb33381dSDaniel Borkmann "totallen for all addresses is %d\n", 2845bb33381dSDaniel Borkmann __func__, totallen); 28468a07eb0aSMichio Honda } 28471da177e4SLinus Torvalds } 28481da177e4SLinus Torvalds 28491da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 28501da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 28511da177e4SLinus Torvalds if (!retval) 28521da177e4SLinus Torvalds return NULL; 28531da177e4SLinus Torvalds 28541da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 28551da177e4SLinus Torvalds addr_buf = addrs; 28561da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2857ea110733SJoe Perches addr = addr_buf; 28581da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28591da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28601da177e4SLinus Torvalds param.param_hdr.type = flags; 28611da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 2862978aa047SXin Long param.crr_id = htonl(i); 28631da177e4SLinus Torvalds 28641da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 28651da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 28661da177e4SLinus Torvalds 28671da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28681da177e4SLinus Torvalds } 28698a07eb0aSMichio Honda if (flags == SCTP_PARAM_ADD_IP && del_pickup) { 28708a07eb0aSMichio Honda addr = asoc->asconf_addr_del_pending; 28718a07eb0aSMichio Honda af = sctp_get_af_specific(addr->v4.sin_family); 28728a07eb0aSMichio Honda addr_param_len = af->to_addr_param(addr, &addr_param); 28738a07eb0aSMichio Honda param.param_hdr.type = SCTP_PARAM_DEL_IP; 28748a07eb0aSMichio Honda param.param_hdr.length = htons(paramlen + addr_param_len); 2875978aa047SXin Long param.crr_id = htonl(i); 28768a07eb0aSMichio Honda 28778a07eb0aSMichio Honda sctp_addto_chunk(retval, paramlen, ¶m); 28788a07eb0aSMichio Honda sctp_addto_chunk(retval, addr_param_len, &addr_param); 28798a07eb0aSMichio Honda } 28801da177e4SLinus Torvalds return retval; 28811da177e4SLinus Torvalds } 28821da177e4SLinus Torvalds 28831da177e4SLinus Torvalds /* ADDIP 28841da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 28851da177e4SLinus Torvalds * 0 1 2 3 28861da177e4SLinus 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 28871da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28881da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 28891da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28901da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28911da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28921da177e4SLinus Torvalds * | Address Parameter | 28931da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28941da177e4SLinus Torvalds * 28951da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 28961da177e4SLinus Torvalds */ 28971da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 28981da177e4SLinus Torvalds union sctp_addr *addr) 28991da177e4SLinus Torvalds { 2900327c0dabSXin Long struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 2901327c0dabSXin Long union sctp_addr_param addrparam; 29028b32f234SXin Long struct sctp_addip_param param; 29031da177e4SLinus Torvalds struct sctp_chunk *retval; 29041da177e4SLinus Torvalds int len = sizeof(param); 29051da177e4SLinus Torvalds int addrlen; 29061da177e4SLinus Torvalds 29071da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 29081da177e4SLinus Torvalds if (!addrlen) 29091da177e4SLinus Torvalds return NULL; 29101da177e4SLinus Torvalds len += addrlen; 29111da177e4SLinus Torvalds 29121da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 29131da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 29141da177e4SLinus Torvalds if (!retval) 29151da177e4SLinus Torvalds return NULL; 29161da177e4SLinus Torvalds 29171da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 29181da177e4SLinus Torvalds param.param_hdr.length = htons(len); 29191da177e4SLinus Torvalds param.crr_id = 0; 29201da177e4SLinus Torvalds 29211da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 29221da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 29231da177e4SLinus Torvalds 29241da177e4SLinus Torvalds return retval; 29251da177e4SLinus Torvalds } 29261da177e4SLinus Torvalds 29271da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 29281da177e4SLinus Torvalds * 0 1 2 3 29291da177e4SLinus 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 29301da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29311da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 29321da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29331da177e4SLinus Torvalds * | Serial Number | 29341da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29351da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 29361da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29371da177e4SLinus Torvalds * \ \ 29381da177e4SLinus Torvalds * / .... / 29391da177e4SLinus Torvalds * \ \ 29401da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29411da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 29421da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29431da177e4SLinus Torvalds * 29441da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 29451da177e4SLinus Torvalds */ 29461da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 29471da177e4SLinus Torvalds __u32 serial, int vparam_len) 29481da177e4SLinus Torvalds { 294965205cc4SXin Long struct sctp_addiphdr asconf; 29501da177e4SLinus Torvalds struct sctp_chunk *retval; 29511da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 29521da177e4SLinus Torvalds 29531da177e4SLinus Torvalds /* Create the chunk. */ 2954cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length, 2955cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 29561da177e4SLinus Torvalds if (!retval) 29571da177e4SLinus Torvalds return NULL; 29581da177e4SLinus Torvalds 29591da177e4SLinus Torvalds asconf.serial = htonl(serial); 29601da177e4SLinus Torvalds 29611da177e4SLinus Torvalds retval->subh.addip_hdr = 29621da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 29631da177e4SLinus Torvalds 29641da177e4SLinus Torvalds return retval; 29651da177e4SLinus Torvalds } 29661da177e4SLinus Torvalds 29671da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 29689f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 29698b32f234SXin Long __be16 err_code, 29708b32f234SXin Long struct sctp_addip_param *asconf_param) 29711da177e4SLinus Torvalds { 29728b32f234SXin Long struct sctp_addip_param ack_param; 2973d8238d9dSXin Long struct sctp_errhdr err_param; 29741da177e4SLinus Torvalds int asconf_param_len = 0; 29751da177e4SLinus Torvalds int err_param_len = 0; 2976dbc16db1SAl Viro __be16 response_type; 29771da177e4SLinus Torvalds 29781da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 29791da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 29801da177e4SLinus Torvalds } else { 29811da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 29821da177e4SLinus Torvalds err_param_len = sizeof(err_param); 29831da177e4SLinus Torvalds if (asconf_param) 29841da177e4SLinus Torvalds asconf_param_len = 29851da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 29861da177e4SLinus Torvalds } 29871da177e4SLinus Torvalds 29881da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 29891da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 29901da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 29911da177e4SLinus Torvalds err_param_len + 29921da177e4SLinus Torvalds asconf_param_len); 29931da177e4SLinus Torvalds ack_param.crr_id = crr_id; 29941da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 29951da177e4SLinus Torvalds 29961da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 29971da177e4SLinus Torvalds return; 29981da177e4SLinus Torvalds 29991da177e4SLinus Torvalds /* Add Error Cause parameter. */ 30001da177e4SLinus Torvalds err_param.cause = err_code; 30011da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 30021da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 30031da177e4SLinus Torvalds 30041da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 30051da177e4SLinus Torvalds if (asconf_param) 30061da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 30071da177e4SLinus Torvalds } 30081da177e4SLinus Torvalds 30091da177e4SLinus Torvalds /* Process a asconf parameter. */ 3010dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 30111da177e4SLinus Torvalds struct sctp_chunk *asconf, 30128b32f234SXin Long struct sctp_addip_param *asconf_param) 30131da177e4SLinus Torvalds { 30141da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3015327c0dabSXin Long struct sctp_transport *peer; 3016327c0dabSXin Long union sctp_addr addr; 3017327c0dabSXin Long struct sctp_af *af; 30181da177e4SLinus Torvalds 30198b32f234SXin Long addr_param = (void *)asconf_param + sizeof(*asconf_param); 3020c1cc678aSPatrick McHardy 302144e65c1eSWei Yongjun if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && 302244e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && 302344e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) 302444e65c1eSWei Yongjun return SCTP_ERROR_UNKNOWN_PARAM; 302544e65c1eSWei Yongjun 30266a435732SShan Wei switch (addr_param->p.type) { 3027c4492586SWei Yongjun case SCTP_PARAM_IPV6_ADDRESS: 3028c4492586SWei Yongjun if (!asoc->peer.ipv6_address) 3029945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3030c4492586SWei Yongjun break; 3031c4492586SWei Yongjun case SCTP_PARAM_IPV4_ADDRESS: 3032c4492586SWei Yongjun if (!asoc->peer.ipv4_address) 3033945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3034c4492586SWei Yongjun break; 3035c4492586SWei Yongjun default: 3036945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3037c4492586SWei Yongjun } 3038c4492586SWei Yongjun 30396a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 30401da177e4SLinus Torvalds if (unlikely(!af)) 3041945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 30421da177e4SLinus Torvalds 3043dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); 304442e30bf3SVlad Yasevich 304542e30bf3SVlad Yasevich /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast 304642e30bf3SVlad Yasevich * or multicast address. 304742e30bf3SVlad Yasevich * (note: wildcard is permitted and requires special handling so 304842e30bf3SVlad Yasevich * make sure we check for that) 304942e30bf3SVlad Yasevich */ 305042e30bf3SVlad Yasevich if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) 3051945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 305242e30bf3SVlad Yasevich 30531da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 30541da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 305542e30bf3SVlad Yasevich /* Section 4.2.1: 305642e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the source 305742e30bf3SVlad Yasevich * address of the packet MUST be added. 305842e30bf3SVlad Yasevich */ 305942e30bf3SVlad Yasevich if (af->is_any(&addr)) 306042e30bf3SVlad Yasevich memcpy(&addr, &asconf->source, sizeof(addr)); 306142e30bf3SVlad Yasevich 30622277c7cdSRichard Haines if (security_sctp_bind_connect(asoc->ep->base.sk, 30632277c7cdSRichard Haines SCTP_PARAM_ADD_IP, 30642277c7cdSRichard Haines (struct sockaddr *)&addr, 30652277c7cdSRichard Haines af->sockaddr_len)) 30662277c7cdSRichard Haines return SCTP_ERROR_REQ_REFUSED; 30672277c7cdSRichard Haines 30681da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 30691da177e4SLinus Torvalds * request and does not have the local resources to add this 30701da177e4SLinus Torvalds * new address to the association, it MUST return an Error 30711da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 30721da177e4SLinus Torvalds * Due to Resource Shortage'. 30731da177e4SLinus Torvalds */ 30741da177e4SLinus Torvalds 3075dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 30761da177e4SLinus Torvalds if (!peer) 30771da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 30781da177e4SLinus Torvalds 30791da177e4SLinus Torvalds /* Start the heartbeat timer. */ 3080ba6f5e33SMarcelo Ricardo Leitner sctp_transport_reset_hb_timer(peer); 30816af29cccSMichio Honda asoc->new_transport = peer; 30821da177e4SLinus Torvalds break; 30831da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 30841da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 30851da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 30861da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 30871da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 30881da177e4SLinus Torvalds */ 308942e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 30901da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 30911da177e4SLinus Torvalds 30921da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 30931da177e4SLinus Torvalds * address which is also the source address of the IP packet 30941da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 30951da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 30961da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 30971da177e4SLinus Torvalds * Delete Source IP Address' 30981da177e4SLinus Torvalds */ 3099b1364104SMichio Honda if (sctp_cmp_addr_exact(&asconf->source, &addr)) 31001da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 31011da177e4SLinus Torvalds 310242e30bf3SVlad Yasevich /* Section 4.2.2 310342e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 310442e30bf3SVlad Yasevich * addresses of the peer except the source address of the 310542e30bf3SVlad Yasevich * packet MUST be deleted. 310642e30bf3SVlad Yasevich */ 310742e30bf3SVlad Yasevich if (af->is_any(&addr)) { 310842e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 310942e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 311042e30bf3SVlad Yasevich asconf->transport); 31117c5a9461Slucien return SCTP_ERROR_NO_ERROR; 31127c5a9461Slucien } 31137c5a9461Slucien 31147c5a9461Slucien /* If the address is not part of the association, the 31157c5a9461Slucien * ASCONF-ACK with Error Cause Indication Parameter 31167c5a9461Slucien * which including cause of Unresolvable Address should 31177c5a9461Slucien * be sent. 31187c5a9461Slucien */ 31197c5a9461Slucien peer = sctp_assoc_lookup_paddr(asoc, &addr); 31207c5a9461Slucien if (!peer) 31217c5a9461Slucien return SCTP_ERROR_DNS_FAILED; 31227c5a9461Slucien 31237c5a9461Slucien sctp_assoc_rm_peer(asoc, peer); 31241da177e4SLinus Torvalds break; 31251da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 312642e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 312742e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 312842e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 312942e30bf3SVlad Yasevich * primary. 313042e30bf3SVlad Yasevich */ 313142e30bf3SVlad Yasevich if (af->is_any(&addr)) 313242e30bf3SVlad Yasevich memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); 313342e30bf3SVlad Yasevich 31342277c7cdSRichard Haines if (security_sctp_bind_connect(asoc->ep->base.sk, 31352277c7cdSRichard Haines SCTP_PARAM_SET_PRIMARY, 31362277c7cdSRichard Haines (struct sockaddr *)&addr, 31372277c7cdSRichard Haines af->sockaddr_len)) 31382277c7cdSRichard Haines return SCTP_ERROR_REQ_REFUSED; 31392277c7cdSRichard Haines 3140dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 31411da177e4SLinus Torvalds if (!peer) 3142945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 31431da177e4SLinus Torvalds 31441da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 31451da177e4SLinus Torvalds break; 31461da177e4SLinus Torvalds } 31471da177e4SLinus Torvalds 31481da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 31491da177e4SLinus Torvalds } 31501da177e4SLinus Torvalds 31516f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 31529de7922bSDaniel Borkmann bool sctp_verify_asconf(const struct sctp_association *asoc, 31539de7922bSDaniel Borkmann struct sctp_chunk *chunk, bool addr_param_needed, 31549de7922bSDaniel Borkmann struct sctp_paramhdr **errp) 31559de7922bSDaniel Borkmann { 315668d75469SXin Long struct sctp_addip_chunk *addip; 31579de7922bSDaniel Borkmann bool addr_param_seen = false; 3158327c0dabSXin Long union sctp_params param; 31596f4c618dSWei Yongjun 316068d75469SXin Long addip = (struct sctp_addip_chunk *)chunk->chunk_hdr; 31619de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 31629de7922bSDaniel Borkmann size_t length = ntohs(param.p->length); 31639de7922bSDaniel Borkmann 31646f4c618dSWei Yongjun *errp = param.p; 31656f4c618dSWei Yongjun switch (param.p->type) { 31669de7922bSDaniel Borkmann case SCTP_PARAM_ERR_CAUSE: 31679de7922bSDaniel Borkmann break; 31689de7922bSDaniel Borkmann case SCTP_PARAM_IPV4_ADDRESS: 3169a38905e6SXin Long if (length != sizeof(struct sctp_ipv4addr_param)) 31709de7922bSDaniel Borkmann return false; 3171ce7b4cccSlucien /* ensure there is only one addr param and it's in the 3172ce7b4cccSlucien * beginning of addip_hdr params, or we reject it. 3173ce7b4cccSlucien */ 3174ce7b4cccSlucien if (param.v != addip->addip_hdr.params) 3175ce7b4cccSlucien return false; 31769de7922bSDaniel Borkmann addr_param_seen = true; 31779de7922bSDaniel Borkmann break; 31789de7922bSDaniel Borkmann case SCTP_PARAM_IPV6_ADDRESS: 317900987cc0SXin Long if (length != sizeof(struct sctp_ipv6addr_param)) 31809de7922bSDaniel Borkmann return false; 3181ce7b4cccSlucien if (param.v != addip->addip_hdr.params) 3182ce7b4cccSlucien return false; 31839de7922bSDaniel Borkmann addr_param_seen = true; 31849de7922bSDaniel Borkmann break; 31856f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 31866f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 31876f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 31889de7922bSDaniel Borkmann /* In ASCONF chunks, these need to be first. */ 31899de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 31909de7922bSDaniel Borkmann return false; 31919de7922bSDaniel Borkmann length = ntohs(param.addip->param_hdr.length); 31928b32f234SXin Long if (length < sizeof(struct sctp_addip_param) + 31933c918704SXin Long sizeof(**errp)) 31949de7922bSDaniel Borkmann return false; 31956f4c618dSWei Yongjun break; 31966f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 31976f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 31988b32f234SXin Long if (length != sizeof(struct sctp_addip_param)) 31999de7922bSDaniel Borkmann return false; 32006f4c618dSWei Yongjun break; 32016f4c618dSWei Yongjun default: 32029de7922bSDaniel Borkmann /* This is unkown to us, reject! */ 32039de7922bSDaniel Borkmann return false; 32049de7922bSDaniel Borkmann } 32056f4c618dSWei Yongjun } 32066f4c618dSWei Yongjun 32079de7922bSDaniel Borkmann /* Remaining sanity checks. */ 32089de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 32099de7922bSDaniel Borkmann return false; 32109de7922bSDaniel Borkmann if (!addr_param_needed && addr_param_seen) 32119de7922bSDaniel Borkmann return false; 32129de7922bSDaniel Borkmann if (param.v != chunk->chunk_end) 32139de7922bSDaniel Borkmann return false; 32146f4c618dSWei Yongjun 32159de7922bSDaniel Borkmann return true; 32166f4c618dSWei Yongjun } 32176f4c618dSWei Yongjun 32181da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 32191da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 32201da177e4SLinus Torvalds */ 32211da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 32221da177e4SLinus Torvalds struct sctp_chunk *asconf) 32231da177e4SLinus Torvalds { 32241da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3225327c0dabSXin Long struct sctp_addip_chunk *addip; 32261da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 3227327c0dabSXin Long bool all_param_pass = true; 3228327c0dabSXin Long struct sctp_addiphdr *hdr; 3229327c0dabSXin Long int length = 0, chunk_len; 3230327c0dabSXin Long union sctp_params param; 3231dbc16db1SAl Viro __be16 err_code; 32321da177e4SLinus Torvalds __u32 serial; 32331da177e4SLinus Torvalds 323468d75469SXin Long addip = (struct sctp_addip_chunk *)asconf->chunk_hdr; 3235922dbc5bSXin Long chunk_len = ntohs(asconf->chunk_hdr->length) - 3236922dbc5bSXin Long sizeof(struct sctp_chunkhdr); 323765205cc4SXin Long hdr = (struct sctp_addiphdr *)asconf->skb->data; 32381da177e4SLinus Torvalds serial = ntohl(hdr->serial); 32391da177e4SLinus Torvalds 32401da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 324165205cc4SXin Long length = sizeof(*hdr); 32421da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 32431da177e4SLinus Torvalds chunk_len -= length; 32441da177e4SLinus Torvalds 32451da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 32467aa1b54bSJoe Perches * asconf parameter. 32471da177e4SLinus Torvalds */ 32486a435732SShan Wei length = ntohs(addr_param->p.length); 32491da177e4SLinus Torvalds chunk_len -= length; 32501da177e4SLinus Torvalds 32511da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 32521da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 32532cab86beSWei Yongjun * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF 32547aa1b54bSJoe Perches * parameters. 32551da177e4SLinus Torvalds */ 32562cab86beSWei Yongjun asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); 32571da177e4SLinus Torvalds if (!asconf_ack) 32581da177e4SLinus Torvalds goto done; 32591da177e4SLinus Torvalds 32601da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 32619de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 32629de7922bSDaniel Borkmann /* Skip preceeding address parameters. */ 32639de7922bSDaniel Borkmann if (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 32649de7922bSDaniel Borkmann param.p->type == SCTP_PARAM_IPV6_ADDRESS) 32659de7922bSDaniel Borkmann continue; 32669de7922bSDaniel Borkmann 32671da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 32689de7922bSDaniel Borkmann param.addip); 32691da177e4SLinus Torvalds /* ADDIP 4.1 A7) 32701da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 32711da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 32721da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 32731da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 32741da177e4SLinus Torvalds * a specific success indication is present for the parameter. 32751da177e4SLinus Torvalds */ 32769de7922bSDaniel Borkmann if (err_code != SCTP_ERROR_NO_ERROR) 32779de7922bSDaniel Borkmann all_param_pass = false; 32781da177e4SLinus Torvalds if (!all_param_pass) 32799de7922bSDaniel Borkmann sctp_add_asconf_response(asconf_ack, param.addip->crr_id, 32809de7922bSDaniel Borkmann err_code, param.addip); 32811da177e4SLinus Torvalds 32821da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 32831da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 32841da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 32851da177e4SLinus Torvalds * in the ASCONF. 32861da177e4SLinus Torvalds */ 32879de7922bSDaniel Borkmann if (err_code == SCTP_ERROR_RSRC_LOW) 32881da177e4SLinus Torvalds goto done; 32891da177e4SLinus Torvalds } 32901da177e4SLinus Torvalds done: 32911da177e4SLinus Torvalds asoc->peer.addip_serial++; 32921da177e4SLinus Torvalds 32931da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 32941da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 32951da177e4SLinus Torvalds */ 32961da177e4SLinus Torvalds if (asconf_ack) { 32971da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3298a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3299a08de64dSVlad Yasevich &asoc->asconf_ack_list); 33001da177e4SLinus Torvalds } 33011da177e4SLinus Torvalds 33021da177e4SLinus Torvalds return asconf_ack; 33031da177e4SLinus Torvalds } 33041da177e4SLinus Torvalds 33051da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 3306425e0f68SWei Yongjun static void sctp_asconf_param_success(struct sctp_association *asoc, 33078b32f234SXin Long struct sctp_addip_param *asconf_param) 33081da177e4SLinus Torvalds { 33091da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 33101da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3311dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 3312327c0dabSXin Long struct sctp_transport *transport; 3313327c0dabSXin Long union sctp_addr addr; 3314327c0dabSXin Long struct sctp_af *af; 33151da177e4SLinus Torvalds 33168b32f234SXin Long addr_param = (void *)asconf_param + sizeof(*asconf_param); 33171da177e4SLinus Torvalds 33181da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 33196a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 3320dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 33211da177e4SLinus Torvalds 33221da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 33231da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3324559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3325559cf710SVlad Yasevich * held, so the list can not change. 3326559cf710SVlad Yasevich */ 33270ed90fb0SVlad Yasevich local_bh_disable(); 3328559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3329dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3330f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3331dc022a98SSridhar Samudrala } 33320ed90fb0SVlad Yasevich local_bh_enable(); 33333cd9749cSWei Yongjun list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33343cd9749cSWei Yongjun transports) { 3335c86a773cSJulian Anastasov sctp_transport_dst_release(transport); 33363cd9749cSWei Yongjun } 33371da177e4SLinus Torvalds break; 33381da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 33390ed90fb0SVlad Yasevich local_bh_disable(); 3340425e0f68SWei Yongjun sctp_del_bind_addr(bp, &addr); 33418a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending != NULL && 33428a07eb0aSMichio Honda sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { 33438a07eb0aSMichio Honda kfree(asoc->asconf_addr_del_pending); 33448a07eb0aSMichio Honda asoc->asconf_addr_del_pending = NULL; 33458a07eb0aSMichio Honda } 33460ed90fb0SVlad Yasevich local_bh_enable(); 33479dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33489dbc15f0SRobert P. J. Day transports) { 3349c86a773cSJulian Anastasov sctp_transport_dst_release(transport); 33501da177e4SLinus Torvalds } 33511da177e4SLinus Torvalds break; 33521da177e4SLinus Torvalds default: 33531da177e4SLinus Torvalds break; 33541da177e4SLinus Torvalds } 33551da177e4SLinus Torvalds } 33561da177e4SLinus Torvalds 33571da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 33581da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 33591da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 33601da177e4SLinus Torvalds * ADDIP 4.1 33611da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 33621da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 33631da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 33641da177e4SLinus Torvalds * specific success indication is present for the parameter. 33651da177e4SLinus Torvalds */ 3366dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 33678b32f234SXin Long struct sctp_addip_param *asconf_param, 33681da177e4SLinus Torvalds int no_err) 33691da177e4SLinus Torvalds { 33708b32f234SXin Long struct sctp_addip_param *asconf_ack_param; 3371d8238d9dSXin Long struct sctp_errhdr *err_param; 3372f3830cccSWei Yongjun int asconf_ack_len; 3373dbc16db1SAl Viro __be16 err_code; 3374327c0dabSXin Long int length; 33751da177e4SLinus Torvalds 33761da177e4SLinus Torvalds if (no_err) 33771da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 33781da177e4SLinus Torvalds else 33791da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 33801da177e4SLinus Torvalds 3381f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3382922dbc5bSXin Long sizeof(struct sctp_chunkhdr); 3383f3830cccSWei Yongjun 33841da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 33851da177e4SLinus Torvalds * the first asconf_ack parameter. 33861da177e4SLinus Torvalds */ 338765205cc4SXin Long length = sizeof(struct sctp_addiphdr); 33888b32f234SXin Long asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data + 33891da177e4SLinus Torvalds length); 33901da177e4SLinus Torvalds asconf_ack_len -= length; 33911da177e4SLinus Torvalds 33921da177e4SLinus Torvalds while (asconf_ack_len > 0) { 33931da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 33941da177e4SLinus Torvalds switch (asconf_ack_param->param_hdr.type) { 33951da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 33961da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 33971da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 33988b32f234SXin Long length = sizeof(*asconf_ack_param); 3399ea110733SJoe Perches err_param = (void *)asconf_ack_param + length; 34001da177e4SLinus Torvalds asconf_ack_len -= length; 34011da177e4SLinus Torvalds if (asconf_ack_len > 0) 34021da177e4SLinus Torvalds return err_param->cause; 34031da177e4SLinus Torvalds else 34041da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 34051da177e4SLinus Torvalds break; 34061da177e4SLinus Torvalds default: 34071da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 34081da177e4SLinus Torvalds } 34091da177e4SLinus Torvalds } 34101da177e4SLinus Torvalds 34111da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 3412ea110733SJoe Perches asconf_ack_param = (void *)asconf_ack_param + length; 34131da177e4SLinus Torvalds asconf_ack_len -= length; 34141da177e4SLinus Torvalds } 34151da177e4SLinus Torvalds 34161da177e4SLinus Torvalds return err_code; 34171da177e4SLinus Torvalds } 34181da177e4SLinus Torvalds 34191da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 34201da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 34211da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 34221da177e4SLinus Torvalds { 34231da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 34248b32f234SXin Long struct sctp_addip_param *asconf_param; 3425327c0dabSXin Long __be16 err_code = SCTP_ERROR_NO_ERROR; 3426327c0dabSXin Long union sctp_addr_param *addr_param; 34271da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 34281da177e4SLinus Torvalds int all_param_pass = 0; 3429327c0dabSXin Long int length = 0; 34301da177e4SLinus Torvalds int no_err = 1; 34311da177e4SLinus Torvalds int retval = 0; 34321da177e4SLinus Torvalds 34331da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 34341da177e4SLinus Torvalds * a pointer to address parameter. 34351da177e4SLinus Torvalds */ 343668d75469SXin Long length = sizeof(struct sctp_addip_chunk); 34371da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 34381da177e4SLinus Torvalds asconf_len -= length; 34391da177e4SLinus Torvalds 34401da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 34417aa1b54bSJoe Perches * pointer to the first asconf parameter. 34421da177e4SLinus Torvalds */ 34436a435732SShan Wei length = ntohs(addr_param->p.length); 3444ea110733SJoe Perches asconf_param = (void *)addr_param + length; 34451da177e4SLinus Torvalds asconf_len -= length; 34461da177e4SLinus Torvalds 34471da177e4SLinus Torvalds /* ADDIP 4.1 34481da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 34491da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 34501da177e4SLinus Torvalds * successful. 34511da177e4SLinus Torvalds */ 345265205cc4SXin Long if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr)) 34531da177e4SLinus Torvalds all_param_pass = 1; 34541da177e4SLinus Torvalds 34551da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 34561da177e4SLinus Torvalds while (asconf_len > 0) { 34571da177e4SLinus Torvalds if (all_param_pass) 34581da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 34591da177e4SLinus Torvalds else { 34601da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 34611da177e4SLinus Torvalds asconf_param, 34621da177e4SLinus Torvalds no_err); 34631da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 34641da177e4SLinus Torvalds no_err = 0; 34651da177e4SLinus Torvalds } 34661da177e4SLinus Torvalds 34671da177e4SLinus Torvalds switch (err_code) { 34681da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 3469425e0f68SWei Yongjun sctp_asconf_param_success(asoc, asconf_param); 34701da177e4SLinus Torvalds break; 34711da177e4SLinus Torvalds 34721da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 34731da177e4SLinus Torvalds retval = 1; 34741da177e4SLinus Torvalds break; 34751da177e4SLinus Torvalds 3476a987f762SWei Yongjun case SCTP_ERROR_UNKNOWN_PARAM: 34771da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 34781da177e4SLinus Torvalds * future. 34791da177e4SLinus Torvalds */ 34801da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 34811da177e4SLinus Torvalds asconf_param->param_hdr.type; 34821da177e4SLinus Torvalds break; 34831da177e4SLinus Torvalds 34841da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 34851da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 34861da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 34871da177e4SLinus Torvalds default: 34881da177e4SLinus Torvalds break; 34891da177e4SLinus Torvalds } 34901da177e4SLinus Torvalds 34911da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 34921da177e4SLinus Torvalds * one. 34931da177e4SLinus Torvalds */ 34941da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3495ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 34961da177e4SLinus Torvalds asconf_len -= length; 34971da177e4SLinus Torvalds } 34981da177e4SLinus Torvalds 3499ddc4bbeeSMichio Honda if (no_err && asoc->src_out_of_asoc_ok) { 35008a07eb0aSMichio Honda asoc->src_out_of_asoc_ok = 0; 3501ddc4bbeeSMichio Honda sctp_transport_immediate_rtx(asoc->peer.primary_path); 3502ddc4bbeeSMichio Honda } 35038a07eb0aSMichio Honda 35041da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 35055f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 35061da177e4SLinus Torvalds sctp_chunk_free(asconf); 35071da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 35081da177e4SLinus Torvalds 35091da177e4SLinus Torvalds return retval; 35101da177e4SLinus Torvalds } 35111da177e4SLinus Torvalds 35121da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 35131da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 35141da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 35151da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 35161da177e4SLinus Torvalds { 35171da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 35181da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 35191da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 35201da177e4SLinus Torvalds size_t hint; 35211da177e4SLinus Torvalds int i; 35221da177e4SLinus Torvalds 35231da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 35241da177e4SLinus Torvalds 3525cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC); 35261da177e4SLinus Torvalds 35271da177e4SLinus Torvalds if (!retval) 35281da177e4SLinus Torvalds return NULL; 35291da177e4SLinus Torvalds 35301da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 35311da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 35321da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 35331da177e4SLinus Torvalds 35341da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 35351da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 35361da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 35371da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 35381da177e4SLinus Torvalds } 35391da177e4SLinus Torvalds 35401da177e4SLinus Torvalds return retval; 35411da177e4SLinus Torvalds } 3542cc16f00fSXin Long 35432d07a49aSXin Long struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc, 35442d07a49aSXin Long __u32 new_cum_tsn, size_t nstreams, 35452d07a49aSXin Long struct sctp_ifwdtsn_skip *skiplist) 35462d07a49aSXin Long { 35472d07a49aSXin Long struct sctp_chunk *retval = NULL; 35482d07a49aSXin Long struct sctp_ifwdtsn_hdr ftsn_hdr; 35492d07a49aSXin Long size_t hint; 35502d07a49aSXin Long 35512d07a49aSXin Long hint = (nstreams + 1) * sizeof(__u32); 35522d07a49aSXin Long 35532d07a49aSXin Long retval = sctp_make_control(asoc, SCTP_CID_I_FWD_TSN, 0, hint, 35542d07a49aSXin Long GFP_ATOMIC); 35552d07a49aSXin Long if (!retval) 35562d07a49aSXin Long return NULL; 35572d07a49aSXin Long 35582d07a49aSXin Long ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 35592d07a49aSXin Long retval->subh.ifwdtsn_hdr = 35602d07a49aSXin Long sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 35612d07a49aSXin Long 35622d07a49aSXin Long sctp_addto_chunk(retval, nstreams * sizeof(skiplist[0]), skiplist); 35632d07a49aSXin Long 35642d07a49aSXin Long return retval; 35652d07a49aSXin Long } 35662d07a49aSXin Long 3567cc16f00fSXin Long /* RE-CONFIG 3.1 (RE-CONFIG chunk) 3568cc16f00fSXin Long * 0 1 2 3 3569cc16f00fSXin 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 3570cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3571cc16f00fSXin Long * | Type = 130 | Chunk Flags | Chunk Length | 3572cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3573cc16f00fSXin Long * \ \ 3574cc16f00fSXin Long * / Re-configuration Parameter / 3575cc16f00fSXin Long * \ \ 3576cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3577cc16f00fSXin Long * \ \ 3578cc16f00fSXin Long * / Re-configuration Parameter (optional) / 3579cc16f00fSXin Long * \ \ 3580cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3581cc16f00fSXin Long */ 3582327c0dabSXin Long static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc, 3583cc16f00fSXin Long int length) 3584cc16f00fSXin Long { 3585cc16f00fSXin Long struct sctp_reconf_chunk *reconf; 3586cc16f00fSXin Long struct sctp_chunk *retval; 3587cc16f00fSXin Long 3588cc16f00fSXin Long retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length, 3589cc16f00fSXin Long GFP_ATOMIC); 3590cc16f00fSXin Long if (!retval) 3591cc16f00fSXin Long return NULL; 3592cc16f00fSXin Long 3593cc16f00fSXin Long reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr; 3594cc16f00fSXin Long retval->param_hdr.v = reconf->params; 3595cc16f00fSXin Long 3596cc16f00fSXin Long return retval; 3597cc16f00fSXin Long } 3598cc16f00fSXin Long 3599cc16f00fSXin Long /* RE-CONFIG 4.1 (STREAM OUT RESET) 3600cc16f00fSXin Long * 0 1 2 3 3601cc16f00fSXin 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 3602cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3603cc16f00fSXin Long * | Parameter Type = 13 | Parameter Length = 16 + 2 * N | 3604cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3605cc16f00fSXin Long * | Re-configuration Request Sequence Number | 3606cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3607cc16f00fSXin Long * | Re-configuration Response Sequence Number | 3608cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3609cc16f00fSXin Long * | Sender's Last Assigned TSN | 3610cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3611cc16f00fSXin Long * | Stream Number 1 (optional) | Stream Number 2 (optional) | 3612cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3613cc16f00fSXin Long * / ...... / 3614cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3615cc16f00fSXin Long * | Stream Number N-1 (optional) | Stream Number N (optional) | 3616cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3617cc16f00fSXin Long * 3618cc16f00fSXin Long * RE-CONFIG 4.2 (STREAM IN RESET) 3619cc16f00fSXin Long * 0 1 2 3 3620cc16f00fSXin 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 3621cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3622cc16f00fSXin Long * | Parameter Type = 14 | Parameter Length = 8 + 2 * N | 3623cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3624cc16f00fSXin Long * | Re-configuration Request Sequence Number | 3625cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3626cc16f00fSXin Long * | Stream Number 1 (optional) | Stream Number 2 (optional) | 3627cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3628cc16f00fSXin Long * / ...... / 3629cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3630cc16f00fSXin Long * | Stream Number N-1 (optional) | Stream Number N (optional) | 3631cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3632cc16f00fSXin Long */ 3633cc16f00fSXin Long struct sctp_chunk *sctp_make_strreset_req( 3634cc16f00fSXin Long const struct sctp_association *asoc, 36351da4fc97SXin Long __u16 stream_num, __be16 *stream_list, 3636cc16f00fSXin Long bool out, bool in) 3637cc16f00fSXin Long { 3638423852f8SXin Long __u16 stream_len = stream_num * sizeof(__u16); 3639cc16f00fSXin Long struct sctp_strreset_outreq outreq; 3640cc16f00fSXin Long struct sctp_strreset_inreq inreq; 3641cc16f00fSXin Long struct sctp_chunk *retval; 364216e1a919SXin Long __u16 outlen, inlen; 3643cc16f00fSXin Long 3644cc16f00fSXin Long outlen = (sizeof(outreq) + stream_len) * out; 3645cc16f00fSXin Long inlen = (sizeof(inreq) + stream_len) * in; 3646cc16f00fSXin Long 3647cc16f00fSXin Long retval = sctp_make_reconf(asoc, outlen + inlen); 3648cc16f00fSXin Long if (!retval) 3649cc16f00fSXin Long return NULL; 3650cc16f00fSXin Long 3651cc16f00fSXin Long if (outlen) { 3652cc16f00fSXin Long outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST; 3653cc16f00fSXin Long outreq.param_hdr.length = htons(outlen); 3654cc16f00fSXin Long outreq.request_seq = htonl(asoc->strreset_outseq); 3655cc16f00fSXin Long outreq.response_seq = htonl(asoc->strreset_inseq - 1); 3656cc16f00fSXin Long outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1); 3657cc16f00fSXin Long 3658cc16f00fSXin Long sctp_addto_chunk(retval, sizeof(outreq), &outreq); 3659cc16f00fSXin Long 3660cc16f00fSXin Long if (stream_len) 3661cc16f00fSXin Long sctp_addto_chunk(retval, stream_len, stream_list); 3662cc16f00fSXin Long } 3663cc16f00fSXin Long 3664cc16f00fSXin Long if (inlen) { 3665cc16f00fSXin Long inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST; 3666cc16f00fSXin Long inreq.param_hdr.length = htons(inlen); 3667cc16f00fSXin Long inreq.request_seq = htonl(asoc->strreset_outseq + out); 3668cc16f00fSXin Long 3669cc16f00fSXin Long sctp_addto_chunk(retval, sizeof(inreq), &inreq); 3670cc16f00fSXin Long 3671cc16f00fSXin Long if (stream_len) 3672cc16f00fSXin Long sctp_addto_chunk(retval, stream_len, stream_list); 3673cc16f00fSXin Long } 3674cc16f00fSXin Long 3675cc16f00fSXin Long return retval; 3676cc16f00fSXin Long } 3677c56480a1SXin Long 3678c56480a1SXin Long /* RE-CONFIG 4.3 (SSN/TSN RESET ALL) 3679c56480a1SXin Long * 0 1 2 3 3680c56480a1SXin 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 3681c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3682c56480a1SXin Long * | Parameter Type = 15 | Parameter Length = 8 | 3683c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3684c56480a1SXin Long * | Re-configuration Request Sequence Number | 3685c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3686c56480a1SXin Long */ 3687c56480a1SXin Long struct sctp_chunk *sctp_make_strreset_tsnreq( 3688c56480a1SXin Long const struct sctp_association *asoc) 3689c56480a1SXin Long { 3690c56480a1SXin Long struct sctp_strreset_tsnreq tsnreq; 3691c56480a1SXin Long __u16 length = sizeof(tsnreq); 3692c56480a1SXin Long struct sctp_chunk *retval; 3693c56480a1SXin Long 3694c56480a1SXin Long retval = sctp_make_reconf(asoc, length); 3695c56480a1SXin Long if (!retval) 3696c56480a1SXin Long return NULL; 3697c56480a1SXin Long 3698c56480a1SXin Long tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST; 3699c56480a1SXin Long tsnreq.param_hdr.length = htons(length); 3700c56480a1SXin Long tsnreq.request_seq = htonl(asoc->strreset_outseq); 3701c56480a1SXin Long 3702c56480a1SXin Long sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq); 3703c56480a1SXin Long 3704c56480a1SXin Long return retval; 3705c56480a1SXin Long } 370678098117SXin Long 370778098117SXin Long /* RE-CONFIG 4.5/4.6 (ADD STREAM) 370878098117SXin Long * 0 1 2 3 370978098117SXin 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 371078098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 371178098117SXin Long * | Parameter Type = 17 | Parameter Length = 12 | 371278098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 371378098117SXin Long * | Re-configuration Request Sequence Number | 371478098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 371578098117SXin Long * | Number of new streams | Reserved | 371678098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 371778098117SXin Long */ 371878098117SXin Long struct sctp_chunk *sctp_make_strreset_addstrm( 371978098117SXin Long const struct sctp_association *asoc, 372078098117SXin Long __u16 out, __u16 in) 372178098117SXin Long { 372278098117SXin Long struct sctp_strreset_addstrm addstrm; 372378098117SXin Long __u16 size = sizeof(addstrm); 372478098117SXin Long struct sctp_chunk *retval; 372578098117SXin Long 372678098117SXin Long retval = sctp_make_reconf(asoc, (!!out + !!in) * size); 372778098117SXin Long if (!retval) 372878098117SXin Long return NULL; 372978098117SXin Long 373078098117SXin Long if (out) { 373178098117SXin Long addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS; 373278098117SXin Long addstrm.param_hdr.length = htons(size); 373378098117SXin Long addstrm.number_of_streams = htons(out); 373478098117SXin Long addstrm.request_seq = htonl(asoc->strreset_outseq); 373578098117SXin Long addstrm.reserved = 0; 373678098117SXin Long 373778098117SXin Long sctp_addto_chunk(retval, size, &addstrm); 373878098117SXin Long } 373978098117SXin Long 374078098117SXin Long if (in) { 374178098117SXin Long addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS; 374278098117SXin Long addstrm.param_hdr.length = htons(size); 374378098117SXin Long addstrm.number_of_streams = htons(in); 374478098117SXin Long addstrm.request_seq = htonl(asoc->strreset_outseq + !!out); 374578098117SXin Long addstrm.reserved = 0; 374678098117SXin Long 374778098117SXin Long sctp_addto_chunk(retval, size, &addstrm); 374878098117SXin Long } 374978098117SXin Long 375078098117SXin Long return retval; 375178098117SXin Long } 3752bd4b9f8bSXin Long 3753bd4b9f8bSXin Long /* RE-CONFIG 4.4 (RESP) 3754bd4b9f8bSXin Long * 0 1 2 3 3755bd4b9f8bSXin 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 3756bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3757bd4b9f8bSXin Long * | Parameter Type = 16 | Parameter Length | 3758bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3759bd4b9f8bSXin Long * | Re-configuration Response Sequence Number | 3760bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3761bd4b9f8bSXin Long * | Result | 3762bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3763bd4b9f8bSXin Long */ 3764327c0dabSXin Long struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc, 3765bd4b9f8bSXin Long __u32 result, __u32 sn) 3766bd4b9f8bSXin Long { 3767bd4b9f8bSXin Long struct sctp_strreset_resp resp; 3768bd4b9f8bSXin Long __u16 length = sizeof(resp); 3769bd4b9f8bSXin Long struct sctp_chunk *retval; 3770bd4b9f8bSXin Long 3771bd4b9f8bSXin Long retval = sctp_make_reconf(asoc, length); 3772bd4b9f8bSXin Long if (!retval) 3773bd4b9f8bSXin Long return NULL; 3774bd4b9f8bSXin Long 3775bd4b9f8bSXin Long resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; 3776bd4b9f8bSXin Long resp.param_hdr.length = htons(length); 3777bd4b9f8bSXin Long resp.response_seq = htonl(sn); 3778bd4b9f8bSXin Long resp.result = htonl(result); 3779bd4b9f8bSXin Long 3780bd4b9f8bSXin Long sctp_addto_chunk(retval, sizeof(resp), &resp); 3781bd4b9f8bSXin Long 3782bd4b9f8bSXin Long return retval; 3783bd4b9f8bSXin Long } 3784bd4b9f8bSXin Long 3785bd4b9f8bSXin Long /* RE-CONFIG 4.4 OPTIONAL (TSNRESP) 3786bd4b9f8bSXin Long * 0 1 2 3 3787bd4b9f8bSXin 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 3788bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3789bd4b9f8bSXin Long * | Parameter Type = 16 | Parameter Length | 3790bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3791bd4b9f8bSXin Long * | Re-configuration Response Sequence Number | 3792bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3793bd4b9f8bSXin Long * | Result | 3794bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3795bd4b9f8bSXin Long * | Sender's Next TSN (optional) | 3796bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3797bd4b9f8bSXin Long * | Receiver's Next TSN (optional) | 3798bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3799bd4b9f8bSXin Long */ 3800327c0dabSXin Long struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc, 3801bd4b9f8bSXin Long __u32 result, __u32 sn, 3802327c0dabSXin Long __u32 sender_tsn, 3803327c0dabSXin Long __u32 receiver_tsn) 3804bd4b9f8bSXin Long { 3805bd4b9f8bSXin Long struct sctp_strreset_resptsn tsnresp; 3806bd4b9f8bSXin Long __u16 length = sizeof(tsnresp); 3807bd4b9f8bSXin Long struct sctp_chunk *retval; 3808bd4b9f8bSXin Long 3809bd4b9f8bSXin Long retval = sctp_make_reconf(asoc, length); 3810bd4b9f8bSXin Long if (!retval) 3811bd4b9f8bSXin Long return NULL; 3812bd4b9f8bSXin Long 3813bd4b9f8bSXin Long tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; 3814bd4b9f8bSXin Long tsnresp.param_hdr.length = htons(length); 3815bd4b9f8bSXin Long 3816bd4b9f8bSXin Long tsnresp.response_seq = htonl(sn); 3817bd4b9f8bSXin Long tsnresp.result = htonl(result); 3818bd4b9f8bSXin Long tsnresp.senders_next_tsn = htonl(sender_tsn); 3819bd4b9f8bSXin Long tsnresp.receivers_next_tsn = htonl(receiver_tsn); 3820bd4b9f8bSXin Long 3821bd4b9f8bSXin Long sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp); 3822bd4b9f8bSXin Long 3823bd4b9f8bSXin Long return retval; 3824bd4b9f8bSXin Long } 3825ea625043SXin Long 3826ea625043SXin Long bool sctp_verify_reconf(const struct sctp_association *asoc, 3827ea625043SXin Long struct sctp_chunk *chunk, 3828ea625043SXin Long struct sctp_paramhdr **errp) 3829ea625043SXin Long { 3830ea625043SXin Long struct sctp_reconf_chunk *hdr; 3831ea625043SXin Long union sctp_params param; 38321da4fc97SXin Long __be16 last = 0; 38331da4fc97SXin Long __u16 cnt = 0; 3834ea625043SXin Long 3835ea625043SXin Long hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; 3836ea625043SXin Long sctp_walk_params(param, hdr, params) { 3837ea625043SXin Long __u16 length = ntohs(param.p->length); 3838ea625043SXin Long 3839ea625043SXin Long *errp = param.p; 3840ea625043SXin Long if (cnt++ > 2) 3841ea625043SXin Long return false; 3842ea625043SXin Long switch (param.p->type) { 3843ea625043SXin Long case SCTP_PARAM_RESET_OUT_REQUEST: 3844ea625043SXin Long if (length < sizeof(struct sctp_strreset_outreq) || 3845ea625043SXin Long (last && last != SCTP_PARAM_RESET_RESPONSE && 3846ea625043SXin Long last != SCTP_PARAM_RESET_IN_REQUEST)) 3847ea625043SXin Long return false; 3848ea625043SXin Long break; 3849ea625043SXin Long case SCTP_PARAM_RESET_IN_REQUEST: 3850ea625043SXin Long if (length < sizeof(struct sctp_strreset_inreq) || 3851ea625043SXin Long (last && last != SCTP_PARAM_RESET_OUT_REQUEST)) 3852ea625043SXin Long return false; 3853ea625043SXin Long break; 3854ea625043SXin Long case SCTP_PARAM_RESET_RESPONSE: 3855ea625043SXin Long if ((length != sizeof(struct sctp_strreset_resp) && 3856ea625043SXin Long length != sizeof(struct sctp_strreset_resptsn)) || 3857ea625043SXin Long (last && last != SCTP_PARAM_RESET_RESPONSE && 3858ea625043SXin Long last != SCTP_PARAM_RESET_OUT_REQUEST)) 3859ea625043SXin Long return false; 3860ea625043SXin Long break; 3861ea625043SXin Long case SCTP_PARAM_RESET_TSN_REQUEST: 3862ea625043SXin Long if (length != 3863ea625043SXin Long sizeof(struct sctp_strreset_tsnreq) || last) 3864ea625043SXin Long return false; 3865ea625043SXin Long break; 3866ea625043SXin Long case SCTP_PARAM_RESET_ADD_IN_STREAMS: 3867ea625043SXin Long if (length != sizeof(struct sctp_strreset_addstrm) || 3868ea625043SXin Long (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS)) 3869ea625043SXin Long return false; 3870ea625043SXin Long break; 3871ea625043SXin Long case SCTP_PARAM_RESET_ADD_OUT_STREAMS: 3872ea625043SXin Long if (length != sizeof(struct sctp_strreset_addstrm) || 3873ea625043SXin Long (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS)) 3874ea625043SXin Long return false; 3875ea625043SXin Long break; 3876ea625043SXin Long default: 3877ea625043SXin Long return false; 3878ea625043SXin Long } 3879ea625043SXin Long 3880ea625043SXin Long last = param.p->type; 3881ea625043SXin Long } 3882ea625043SXin Long 3883ea625043SXin Long return true; 3884ea625043SXin Long } 3885