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 1141e38d86b3SXin Long struct sctp_chunk *sctp_make_new_encap_port(const struct sctp_association *asoc, 1142e38d86b3SXin Long const struct sctp_chunk *chunk) 1143e38d86b3SXin Long { 1144e38d86b3SXin Long struct sctp_new_encap_port_hdr nep; 1145e38d86b3SXin Long struct sctp_chunk *retval; 1146e38d86b3SXin Long 1147e38d86b3SXin Long retval = sctp_make_abort(asoc, chunk, 1148e38d86b3SXin Long sizeof(struct sctp_errhdr) + sizeof(nep)); 1149e38d86b3SXin Long if (!retval) 1150e38d86b3SXin Long goto nodata; 1151e38d86b3SXin Long 1152e38d86b3SXin Long sctp_init_cause(retval, SCTP_ERROR_NEW_ENCAP_PORT, sizeof(nep)); 1153e38d86b3SXin Long nep.cur_port = SCTP_INPUT_CB(chunk->skb)->encap_port; 1154e38d86b3SXin Long nep.new_port = chunk->transport->encap_port; 1155e38d86b3SXin Long sctp_addto_chunk(retval, sizeof(nep), &nep); 1156e38d86b3SXin Long 1157e38d86b3SXin Long nodata: 1158e38d86b3SXin Long return retval; 1159e38d86b3SXin Long } 1160e38d86b3SXin Long 11611da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 11621da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 1163fe59379bSXin Long const struct sctp_transport *transport, 1164fe59379bSXin Long __u32 probe_size) 11651da177e4SLinus Torvalds { 1166a34dcbfaSDan Carpenter struct sctp_sender_hb_info hbinfo = {}; 116792c73af5SWei Yongjun struct sctp_chunk *retval; 116892c73af5SWei Yongjun 1169cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, 1170cea8768fSMarcelo Ricardo Leitner sizeof(hbinfo), GFP_ATOMIC); 11711da177e4SLinus Torvalds 11721da177e4SLinus Torvalds if (!retval) 11731da177e4SLinus Torvalds goto nodata; 11741da177e4SLinus Torvalds 117592c73af5SWei Yongjun hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; 1176edf903f8SXin Long hbinfo.param_hdr.length = htons(sizeof(hbinfo)); 117792c73af5SWei Yongjun hbinfo.daddr = transport->ipaddr; 117892c73af5SWei Yongjun hbinfo.sent_at = jiffies; 117992c73af5SWei Yongjun hbinfo.hb_nonce = transport->hb_nonce; 1180fe59379bSXin Long hbinfo.probe_size = probe_size; 118192c73af5SWei Yongjun 11821da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 11831da177e4SLinus Torvalds * what transport it belongs to. 11841da177e4SLinus Torvalds */ 11851da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 118692c73af5SWei Yongjun retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), 118792c73af5SWei Yongjun &hbinfo); 1188fe59379bSXin Long retval->pmtu_probe = !!probe_size; 11891da177e4SLinus Torvalds 11901da177e4SLinus Torvalds nodata: 11911da177e4SLinus Torvalds return retval; 11921da177e4SLinus Torvalds } 11931da177e4SLinus Torvalds 11941da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 11951da177e4SLinus Torvalds const struct sctp_chunk *chunk, 1196327c0dabSXin Long const void *payload, 1197327c0dabSXin Long const size_t paylen) 11981da177e4SLinus Torvalds { 11991da177e4SLinus Torvalds struct sctp_chunk *retval; 12001da177e4SLinus Torvalds 1201cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen, 1202cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 12031da177e4SLinus Torvalds if (!retval) 12041da177e4SLinus Torvalds goto nodata; 12051da177e4SLinus Torvalds 12061da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 12071da177e4SLinus Torvalds 12081da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 12091da177e4SLinus Torvalds * 12101da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 12111da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 12121da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 12131da177e4SLinus Torvalds * to which it is replying. 12141da177e4SLinus Torvalds * 12151da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 12161da177e4SLinus Torvalds */ 12171da177e4SLinus Torvalds if (chunk) 12181da177e4SLinus Torvalds retval->transport = chunk->transport; 12191da177e4SLinus Torvalds 12201da177e4SLinus Torvalds nodata: 12211da177e4SLinus Torvalds return retval; 12221da177e4SLinus Torvalds } 12231da177e4SLinus Torvalds 1224745a3211SXin Long /* RFC4820 3. Padding Chunk (PAD) 1225745a3211SXin Long * 0 1 2 3 1226745a3211SXin 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 1227745a3211SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1228745a3211SXin Long * | Type = 0x84 | Flags=0 | Length | 1229745a3211SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1230745a3211SXin Long * | | 1231745a3211SXin Long * \ Padding Data / 1232745a3211SXin Long * / \ 1233745a3211SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1234745a3211SXin Long */ 1235745a3211SXin Long struct sctp_chunk *sctp_make_pad(const struct sctp_association *asoc, int len) 1236745a3211SXin Long { 1237745a3211SXin Long struct sctp_chunk *retval; 1238745a3211SXin Long 1239745a3211SXin Long retval = sctp_make_control(asoc, SCTP_CID_PAD, 0, len, GFP_ATOMIC); 1240745a3211SXin Long if (!retval) 1241745a3211SXin Long return NULL; 1242745a3211SXin Long 1243745a3211SXin Long skb_put_zero(retval->skb, len); 1244745a3211SXin Long retval->chunk_hdr->length = htons(ntohs(retval->chunk_hdr->length) + len); 1245745a3211SXin Long retval->chunk_end = skb_tail_pointer(retval->skb); 1246745a3211SXin Long 1247745a3211SXin Long return retval; 1248745a3211SXin Long } 1249745a3211SXin Long 12501da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 12511da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 12521da177e4SLinus Torvalds */ 12531da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 12541da177e4SLinus Torvalds const struct sctp_association *asoc, 12551da177e4SLinus Torvalds const struct sctp_chunk *chunk, 12561da177e4SLinus Torvalds size_t size) 12571da177e4SLinus Torvalds { 12581da177e4SLinus Torvalds struct sctp_chunk *retval; 12591da177e4SLinus Torvalds 1260072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, 1261d8238d9dSXin Long sizeof(struct sctp_errhdr) + size, 1262d8238d9dSXin Long GFP_ATOMIC); 12631da177e4SLinus Torvalds if (!retval) 12641da177e4SLinus Torvalds goto nodata; 12651da177e4SLinus Torvalds 12661da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 12671da177e4SLinus Torvalds * 12681da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 12691da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 12701da177e4SLinus Torvalds * address from which it received the DATA or control chunk 12711da177e4SLinus Torvalds * to which it is replying. 12721da177e4SLinus Torvalds * 12731da177e4SLinus Torvalds */ 12741da177e4SLinus Torvalds if (chunk) 12751da177e4SLinus Torvalds retval->transport = chunk->transport; 12761da177e4SLinus Torvalds 12771da177e4SLinus Torvalds nodata: 12781da177e4SLinus Torvalds return retval; 12791da177e4SLinus Torvalds } 12801da177e4SLinus Torvalds 12818914f4baSMarcelo Ricardo Leitner /* Create an Operation Error chunk of a fixed size, specifically, 12828914f4baSMarcelo Ricardo Leitner * min(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) - overheads. 128314f45bb7SRandy Dunlap * This is a helper function to allocate an error chunk for those 12848914f4baSMarcelo Ricardo Leitner * invalid parameter codes in which we may not want to report all the 12858914f4baSMarcelo Ricardo Leitner * errors, if the incoming chunk is large. If it can't fit in a single 12868914f4baSMarcelo Ricardo Leitner * packet, we ignore it. 12875fa782c2SNeil Horman */ 12888914f4baSMarcelo Ricardo Leitner static inline struct sctp_chunk *sctp_make_op_error_limited( 12895fa782c2SNeil Horman const struct sctp_association *asoc, 12905fa782c2SNeil Horman const struct sctp_chunk *chunk) 12915fa782c2SNeil Horman { 12928914f4baSMarcelo Ricardo Leitner size_t size = SCTP_DEFAULT_MAXSEGMENT; 12938914f4baSMarcelo Ricardo Leitner struct sctp_sock *sp = NULL; 12945fa782c2SNeil Horman 12958914f4baSMarcelo Ricardo Leitner if (asoc) { 12968914f4baSMarcelo Ricardo Leitner size = min_t(size_t, size, asoc->pathmtu); 12978914f4baSMarcelo Ricardo Leitner sp = sctp_sk(asoc->base.sk); 12988914f4baSMarcelo Ricardo Leitner } 12998914f4baSMarcelo Ricardo Leitner 13008914f4baSMarcelo Ricardo Leitner size = sctp_mtu_payload(sp, size, sizeof(struct sctp_errhdr)); 13015fa782c2SNeil Horman 13025fa782c2SNeil Horman return sctp_make_op_error_space(asoc, chunk, size); 13035fa782c2SNeil Horman } 13045fa782c2SNeil Horman 13051da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 13061da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 13071da177e4SLinus Torvalds const struct sctp_chunk *chunk, 130863706c5cSAl Viro __be16 cause_code, const void *payload, 13096383cfb3SVlad Yasevich size_t paylen, size_t reserve_tail) 13101da177e4SLinus Torvalds { 13111da177e4SLinus Torvalds struct sctp_chunk *retval; 13121da177e4SLinus Torvalds 13136383cfb3SVlad Yasevich retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); 13141da177e4SLinus Torvalds if (!retval) 13151da177e4SLinus Torvalds goto nodata; 13161da177e4SLinus Torvalds 13176383cfb3SVlad Yasevich sctp_init_cause(retval, cause_code, paylen + reserve_tail); 131800f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 13196383cfb3SVlad Yasevich if (reserve_tail) 13206383cfb3SVlad Yasevich sctp_addto_param(retval, reserve_tail, NULL); 13211da177e4SLinus Torvalds 13221da177e4SLinus Torvalds nodata: 13231da177e4SLinus Torvalds return retval; 13241da177e4SLinus Torvalds } 13251da177e4SLinus Torvalds 13261b1e0bc9SXin Long struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc, 13271b1e0bc9SXin Long __u16 key_id) 13284cd57c80SVlad Yasevich { 13294cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 1330327c0dabSXin Long struct sctp_hmac *hmac_desc; 1331327c0dabSXin Long struct sctp_chunk *retval; 13324cd57c80SVlad Yasevich 13334cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 13344cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 13354cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 13364cd57c80SVlad Yasevich return NULL; 13374cd57c80SVlad Yasevich 1338072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, 133996f7ef4dSXin Long hmac_desc->hmac_len + sizeof(auth_hdr), 1340cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 13414cd57c80SVlad Yasevich if (!retval) 13424cd57c80SVlad Yasevich return NULL; 13434cd57c80SVlad Yasevich 13444cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 13451b1e0bc9SXin Long auth_hdr.shkey_id = htons(key_id); 13464cd57c80SVlad Yasevich 134796f7ef4dSXin Long retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr), 13484cd57c80SVlad Yasevich &auth_hdr); 13494cd57c80SVlad Yasevich 1350594831a8SMarcelo Ricardo Leitner skb_put_zero(retval->skb, hmac_desc->hmac_len); 13514cd57c80SVlad Yasevich 13524cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 13534cd57c80SVlad Yasevich retval->chunk_hdr->length = 13544cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 13554cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 13564cd57c80SVlad Yasevich 13574cd57c80SVlad Yasevich return retval; 13584cd57c80SVlad Yasevich } 13594cd57c80SVlad Yasevich 13604cd57c80SVlad Yasevich 13611da177e4SLinus Torvalds /******************************************************************** 13621da177e4SLinus Torvalds * 2nd Level Abstractions 13631da177e4SLinus Torvalds ********************************************************************/ 13641da177e4SLinus Torvalds 13651da177e4SLinus Torvalds /* Turn an skb into a chunk. 13661da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 13673dc0a548Swangweidong * 13683dc0a548Swangweidong * sctpimpguide-05.txt Section 2.8.2 13693dc0a548Swangweidong * M1) Each time a new DATA chunk is transmitted 13703dc0a548Swangweidong * set the 'TSN.Missing.Report' count for that TSN to 0. The 13713dc0a548Swangweidong * 'TSN.Missing.Report' count will be used to determine missing chunks 13723dc0a548Swangweidong * and when to fast retransmit. 13733dc0a548Swangweidong * 13741da177e4SLinus Torvalds */ 13751da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 13761da177e4SLinus Torvalds const struct sctp_association *asoc, 1377cea8768fSMarcelo Ricardo Leitner struct sock *sk, gfp_t gfp) 13781da177e4SLinus Torvalds { 13791da177e4SLinus Torvalds struct sctp_chunk *retval; 13801da177e4SLinus Torvalds 1381cea8768fSMarcelo Ricardo Leitner retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp); 13821da177e4SLinus Torvalds 13831da177e4SLinus Torvalds if (!retval) 13841da177e4SLinus Torvalds goto nodata; 1385bb33381dSDaniel Borkmann if (!sk) 1386bb33381dSDaniel Borkmann pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); 13871da177e4SLinus Torvalds 138879af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 13891da177e4SLinus Torvalds retval->skb = skb; 13901da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 13911da177e4SLinus Torvalds retval->singleton = 1; 13921da177e4SLinus Torvalds 1393c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 13941da177e4SLinus Torvalds 13951da177e4SLinus Torvalds /* Polish the bead hole. */ 13961da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 13971da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 13981da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 1399e7f02796SReshetova, Elena refcount_set(&retval->refcnt, 1); 14001da177e4SLinus Torvalds 14011da177e4SLinus Torvalds nodata: 14021da177e4SLinus Torvalds return retval; 14031da177e4SLinus Torvalds } 14041da177e4SLinus Torvalds 14051da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 14061da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 14071da177e4SLinus Torvalds union sctp_addr *dest) 14081da177e4SLinus Torvalds { 1409f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 141016b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 14111da177e4SLinus Torvalds } 14121da177e4SLinus Torvalds 14131da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 14141da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 14151da177e4SLinus Torvalds { 14161da177e4SLinus Torvalds /* If we have a known transport, use that. */ 14171da177e4SLinus Torvalds if (chunk->transport) { 14186a1e5f33SAl Viro return &chunk->transport->ipaddr; 14191da177e4SLinus Torvalds } else { 14201da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 14216a1e5f33SAl Viro return &chunk->source; 14221da177e4SLinus Torvalds } 14231da177e4SLinus Torvalds } 14241da177e4SLinus Torvalds 14251da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 14261da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 14271da177e4SLinus Torvalds */ 1428072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 1429cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1430cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 14311da177e4SLinus Torvalds { 1432922dbc5bSXin Long struct sctp_chunkhdr *chunk_hdr; 1433327c0dabSXin Long struct sctp_chunk *retval; 14341da177e4SLinus Torvalds struct sk_buff *skb; 14351da177e4SLinus Torvalds struct sock *sk; 143607f2c7abSAlexey Kodanev int chunklen; 143707f2c7abSAlexey Kodanev 143807f2c7abSAlexey Kodanev chunklen = SCTP_PAD4(sizeof(*chunk_hdr) + paylen); 143907f2c7abSAlexey Kodanev if (chunklen > SCTP_MAX_CHUNK_LEN) 144007f2c7abSAlexey Kodanev goto nodata; 14411da177e4SLinus Torvalds 14421da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 144307f2c7abSAlexey Kodanev skb = alloc_skb(chunklen, gfp); 14441da177e4SLinus Torvalds if (!skb) 14451da177e4SLinus Torvalds goto nodata; 14461da177e4SLinus Torvalds 14471da177e4SLinus Torvalds /* Make room for the chunk header. */ 1448922dbc5bSXin Long chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr)); 14491da177e4SLinus Torvalds chunk_hdr->type = type; 14501da177e4SLinus Torvalds chunk_hdr->flags = flags; 1451922dbc5bSXin Long chunk_hdr->length = htons(sizeof(*chunk_hdr)); 14521da177e4SLinus Torvalds 14531da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 1454cea8768fSMarcelo Ricardo Leitner retval = sctp_chunkify(skb, asoc, sk, gfp); 14551da177e4SLinus Torvalds if (!retval) { 14561da177e4SLinus Torvalds kfree_skb(skb); 14571da177e4SLinus Torvalds goto nodata; 14581da177e4SLinus Torvalds } 14591da177e4SLinus Torvalds 14601da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 1461922dbc5bSXin Long retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr); 14621da177e4SLinus Torvalds 14634cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 14644cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 14654cd57c80SVlad Yasevich retval->auth = 1; 14664cd57c80SVlad Yasevich 14671da177e4SLinus Torvalds return retval; 14681da177e4SLinus Torvalds nodata: 14691da177e4SLinus Torvalds return NULL; 14701da177e4SLinus Torvalds } 14711da177e4SLinus Torvalds 1472072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 1473cea8768fSMarcelo Ricardo Leitner __u8 flags, int paylen, gfp_t gfp) 1474072017b4SVlad Yasevich { 1475cea8768fSMarcelo Ricardo Leitner return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp); 1476072017b4SVlad Yasevich } 1477072017b4SVlad Yasevich 1478ad05a7a0SXin Long struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc, 1479ad05a7a0SXin Long __u8 flags, int paylen, gfp_t gfp) 1480ad05a7a0SXin Long { 1481ad05a7a0SXin Long return _sctp_make_chunk(asoc, SCTP_CID_I_DATA, flags, paylen, gfp); 1482ad05a7a0SXin Long } 1483ad05a7a0SXin Long 1484072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 1485cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1486cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 1487072017b4SVlad Yasevich { 1488cea8768fSMarcelo Ricardo Leitner struct sctp_chunk *chunk; 1489072017b4SVlad Yasevich 1490cea8768fSMarcelo Ricardo Leitner chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp); 1491072017b4SVlad Yasevich if (chunk) 1492072017b4SVlad Yasevich sctp_control_set_owner_w(chunk); 1493072017b4SVlad Yasevich 1494072017b4SVlad Yasevich return chunk; 1495072017b4SVlad Yasevich } 14961da177e4SLinus Torvalds 14971da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 14981da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 14991da177e4SLinus Torvalds { 1500a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1501a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1502a08de64dSVlad Yasevich 1503c485658bSDaniel Borkmann consume_skb(chunk->skb); 1504c485658bSDaniel Borkmann consume_skb(chunk->auth_chunk); 15051da177e4SLinus Torvalds 15061da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 15071da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 15081da177e4SLinus Torvalds } 15091da177e4SLinus Torvalds 15101da177e4SLinus Torvalds /* Possibly, free the chunk. */ 15111da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 15121da177e4SLinus Torvalds { 15131da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 15141da177e4SLinus Torvalds if (chunk->msg) 15151da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 15161da177e4SLinus Torvalds 15171da177e4SLinus Torvalds sctp_chunk_put(chunk); 15181da177e4SLinus Torvalds } 15191da177e4SLinus Torvalds 15201da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 15211da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 15221da177e4SLinus Torvalds { 1523e7f02796SReshetova, Elena refcount_inc(&ch->refcnt); 15241da177e4SLinus Torvalds } 15251da177e4SLinus Torvalds 15261da177e4SLinus Torvalds /* Release a reference to the chunk. */ 15271da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 15281da177e4SLinus Torvalds { 1529e7f02796SReshetova, Elena if (refcount_dec_and_test(&ch->refcnt)) 15301da177e4SLinus Torvalds sctp_chunk_destroy(ch); 15311da177e4SLinus Torvalds } 15321da177e4SLinus Torvalds 15331da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 15341da177e4SLinus Torvalds * enough. 15351da177e4SLinus Torvalds */ 15361da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 15371da177e4SLinus Torvalds { 15381da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 1539e2f036a9SMarcelo Ricardo Leitner int padlen = SCTP_PAD4(chunklen) - chunklen; 1540327c0dabSXin Long void *target; 15411da177e4SLinus Torvalds 1542b952f4dfSyuan linyu skb_put_zero(chunk->skb, padlen); 154359ae1d12SJohannes Berg target = skb_put_data(chunk->skb, data, len); 15441da177e4SLinus Torvalds 15451da177e4SLinus Torvalds /* Adjust the chunk length field. */ 15461da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 154727a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 15481da177e4SLinus Torvalds 15491da177e4SLinus Torvalds return target; 15501da177e4SLinus Torvalds } 15511da177e4SLinus Torvalds 15521da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 15531da177e4SLinus Torvalds * chunk is not big enough. 15541da177e4SLinus Torvalds * Returns a kernel err value. 15551da177e4SLinus Torvalds */ 1556e0eb093eSAl Viro int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 1557e0eb093eSAl Viro struct iov_iter *from) 15581da177e4SLinus Torvalds { 1559e0eb093eSAl Viro void *target; 15601da177e4SLinus Torvalds 15611da177e4SLinus Torvalds /* Make room in chunk for data. */ 15621da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 15631da177e4SLinus Torvalds 15641da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 15653b6d4dbfSAl Viro if (!copy_from_iter_full(target, len, from)) 1566e0eb093eSAl Viro return -EFAULT; 15671da177e4SLinus Torvalds 15681da177e4SLinus Torvalds /* Adjust the chunk length field. */ 15691da177e4SLinus Torvalds chunk->chunk_hdr->length = 15701da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 157127a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 15721da177e4SLinus Torvalds 1573e0eb093eSAl Viro return 0; 15741da177e4SLinus Torvalds } 15751da177e4SLinus Torvalds 15761da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15771da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15781da177e4SLinus Torvalds */ 15791da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 15801da177e4SLinus Torvalds { 1581ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 1582327c0dabSXin Long struct sctp_chunk *lchunk; 1583327c0dabSXin Long struct sctp_datamsg *msg; 1584327c0dabSXin Long __u16 ssn, sid; 15851da177e4SLinus Torvalds 15861da177e4SLinus Torvalds if (chunk->has_ssn) 15871da177e4SLinus Torvalds return; 15881da177e4SLinus Torvalds 1589ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1590ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1591cee360abSXin Long stream = &chunk->asoc->stream; 1592ab3e5e7bSVlad Yasevich 1593ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1594ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1595ab3e5e7bSVlad Yasevich */ 1596ab3e5e7bSVlad Yasevich msg = chunk->msg; 1597ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1598ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 15991da177e4SLinus Torvalds ssn = 0; 16001da177e4SLinus Torvalds } else { 1601ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1602a8386317SXin Long ssn = sctp_ssn_next(stream, out, sid); 16031da177e4SLinus Torvalds else 1604a8386317SXin Long ssn = sctp_ssn_peek(stream, out, sid); 16051da177e4SLinus Torvalds } 16061da177e4SLinus Torvalds 1607ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1608ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1609ab3e5e7bSVlad Yasevich } 16101da177e4SLinus Torvalds } 16111da177e4SLinus Torvalds 16121da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 16131da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 16141da177e4SLinus Torvalds */ 16151da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 16161da177e4SLinus Torvalds { 16171da177e4SLinus Torvalds if (!chunk->has_tsn) { 16181da177e4SLinus Torvalds /* This is the last possible instant to 16191da177e4SLinus Torvalds * assign a TSN. 16201da177e4SLinus Torvalds */ 16211da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 16221da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 16231da177e4SLinus Torvalds chunk->has_tsn = 1; 16241da177e4SLinus Torvalds } 16251da177e4SLinus Torvalds } 16261da177e4SLinus Torvalds 16271da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 16281da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 16293182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1630dd0fc66fSAl Viro gfp_t gfp) 16311da177e4SLinus Torvalds { 16321da177e4SLinus Torvalds struct sctp_association *asoc; 16331c662018SXin Long enum sctp_scope scope; 16341da177e4SLinus Torvalds struct sk_buff *skb; 16351da177e4SLinus Torvalds 16361da177e4SLinus Torvalds /* Create the bare association. */ 16371da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 16381da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 16391da177e4SLinus Torvalds if (!asoc) 16401da177e4SLinus Torvalds goto nodata; 16411da177e4SLinus Torvalds asoc->temp = 1; 16421da177e4SLinus Torvalds skb = chunk->skb; 16431da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1644e7487c86SMarcelo Ricardo Leitner SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1); 1645e7487c86SMarcelo Ricardo Leitner 16461da177e4SLinus Torvalds nodata: 16471da177e4SLinus Torvalds return asoc; 16481da177e4SLinus Torvalds } 16491da177e4SLinus Torvalds 16501da177e4SLinus Torvalds /* Build a cookie representing asoc. 16511da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 16521da177e4SLinus Torvalds */ 1653f48ef4c7SXin Long static struct sctp_cookie_param *sctp_pack_cookie( 1654f48ef4c7SXin Long const struct sctp_endpoint *ep, 16551da177e4SLinus Torvalds const struct sctp_association *asoc, 16561da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 1657327c0dabSXin Long int *cookie_len, const __u8 *raw_addrs, 1658327c0dabSXin Long int addrs_len) 16591da177e4SLinus Torvalds { 16601da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 1661f48ef4c7SXin Long struct sctp_cookie_param *retval; 16621da177e4SLinus Torvalds int headersize, bodysize; 16631da177e4SLinus Torvalds 16649834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 16659834a2bbSVlad Yasevich * any padding. 16669834a2bbSVlad Yasevich */ 16673c918704SXin Long headersize = sizeof(struct sctp_paramhdr) + 16689834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 16699834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 16701da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 16711da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 16721da177e4SLinus Torvalds 16731da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 16741da177e4SLinus Torvalds * functions simpler to write. 16751da177e4SLinus Torvalds */ 16761da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 16771da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 16781da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 16791da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 16801da177e4SLinus Torvalds 16811da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 16821da177e4SLinus Torvalds * out on the network. 16831da177e4SLinus Torvalds */ 1684af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1685af997d8cSArnaldo Carvalho de Melo if (!retval) 1686af997d8cSArnaldo Carvalho de Melo goto nodata; 1687af997d8cSArnaldo Carvalho de Melo 16881da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 16891da177e4SLinus Torvalds 16901da177e4SLinus Torvalds /* Set up the parameter header. */ 16911da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 16921da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 16931da177e4SLinus Torvalds 16941da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 16951da177e4SLinus Torvalds cookie->c = asoc->c; 16961da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 16971da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 16981da177e4SLinus Torvalds 16991da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 17001da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 17011da177e4SLinus Torvalds 17020f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 17030f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 17041da177e4SLinus Torvalds 17051da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 170652db882fSDaniel Borkmann cookie->c.expiration = ktime_add(asoc->cookie_life, 1707cb5e173eSMarcelo Ricardo Leitner ktime_get_real()); 17081da177e4SLinus Torvalds 17091da177e4SLinus Torvalds /* Copy the peer's init packet. */ 17101da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 17111da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 17121da177e4SLinus Torvalds 17131da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 17141da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 17151da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 17161da177e4SLinus Torvalds 17171da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 171875b93c63SEric Biggers struct crypto_shash *tfm = sctp_sk(ep->base.sk)->hmac; 17195821c769SHerbert Xu int err; 17201b489e11SHerbert Xu 17211da177e4SLinus Torvalds /* Sign the message. */ 172275b93c63SEric Biggers err = crypto_shash_setkey(tfm, ep->secret_key, 17235821c769SHerbert Xu sizeof(ep->secret_key)) ?: 172475b93c63SEric Biggers crypto_shash_tfm_digest(tfm, (u8 *)&cookie->c, bodysize, 17255821c769SHerbert Xu cookie->signature); 17265821c769SHerbert Xu if (err) 17271b489e11SHerbert Xu goto free_cookie; 17281da177e4SLinus Torvalds } 17291da177e4SLinus Torvalds 17301da177e4SLinus Torvalds return retval; 17311b489e11SHerbert Xu 17321b489e11SHerbert Xu free_cookie: 17331b489e11SHerbert Xu kfree(retval); 17341b489e11SHerbert Xu nodata: 17351b489e11SHerbert Xu *cookie_len = 0; 17361b489e11SHerbert Xu return NULL; 17371da177e4SLinus Torvalds } 17381da177e4SLinus Torvalds 17391da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 17401da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 17411da177e4SLinus Torvalds const struct sctp_endpoint *ep, 17421da177e4SLinus Torvalds const struct sctp_association *asoc, 1743dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 17441da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 17451da177e4SLinus Torvalds { 17461da177e4SLinus Torvalds struct sctp_association *retval = NULL; 17471da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1748327c0dabSXin Long struct sctp_signed_cookie *cookie; 17491da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 1750327c0dabSXin Long struct sctp_cookie *bear_cookie; 1751327c0dabSXin Long __u8 *digest = ep->digest; 1752327c0dabSXin Long enum sctp_scope scope; 1753327c0dabSXin Long unsigned int len; 175452db882fSDaniel Borkmann ktime_t kt; 17551da177e4SLinus Torvalds 17569834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 17579834a2bbSVlad Yasevich * any padding. 17589834a2bbSVlad Yasevich */ 1759922dbc5bSXin Long headersize = sizeof(struct sctp_chunkhdr) + 17609834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 17619834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 17621da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 17631da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 17641da177e4SLinus Torvalds 17651da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 17661da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 17671da177e4SLinus Torvalds * INIT chunk. 17681da177e4SLinus Torvalds */ 17691da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17701da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 17711da177e4SLinus Torvalds goto malformed; 17721da177e4SLinus Torvalds 17731da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 17741da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 17751da177e4SLinus Torvalds goto malformed; 17761da177e4SLinus Torvalds 17771da177e4SLinus Torvalds /* Process the cookie. */ 17781da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 17791da177e4SLinus Torvalds bear_cookie = &cookie->c; 17801da177e4SLinus Torvalds 17811da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 17821da177e4SLinus Torvalds goto no_hmac; 17831da177e4SLinus Torvalds 17841da177e4SLinus Torvalds /* Check the signature. */ 17855821c769SHerbert Xu { 178675b93c63SEric Biggers struct crypto_shash *tfm = sctp_sk(ep->base.sk)->hmac; 17875821c769SHerbert Xu int err; 17881da177e4SLinus Torvalds 178975b93c63SEric Biggers err = crypto_shash_setkey(tfm, ep->secret_key, 17905821c769SHerbert Xu sizeof(ep->secret_key)) ?: 179175b93c63SEric Biggers crypto_shash_tfm_digest(tfm, (u8 *)bear_cookie, bodysize, 17925821c769SHerbert Xu digest); 17935821c769SHerbert Xu if (err) { 17941b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17951b489e11SHerbert Xu goto fail; 17961b489e11SHerbert Xu } 17975821c769SHerbert Xu } 17981da177e4SLinus Torvalds 17991da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 18001da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 18011da177e4SLinus Torvalds goto fail; 18021da177e4SLinus Torvalds } 18031da177e4SLinus Torvalds 18041da177e4SLinus Torvalds no_hmac: 18051da177e4SLinus Torvalds /* IG Section 2.35.2: 18061da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 18071da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 18081da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 18091da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 18101da177e4SLinus Torvalds * discarded, 18111da177e4SLinus Torvalds */ 18121da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 18131da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 18141da177e4SLinus Torvalds goto fail; 18151da177e4SLinus Torvalds } 18161da177e4SLinus Torvalds 18179b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 18181da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 18191da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 18201da177e4SLinus Torvalds goto fail; 18211da177e4SLinus Torvalds } 18221da177e4SLinus Torvalds 18231da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 18241da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 18251da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1826f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1827f236218bSVlad Yasevich * use current time. This introduces a small possibility that 182814f45bb7SRandy Dunlap * a cookie may be considered expired, but this would only slow 1829f236218bSVlad Yasevich * down the new association establishment instead of every packet. 18301da177e4SLinus Torvalds */ 1831f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 183252db882fSDaniel Borkmann kt = skb_get_ktime(skb); 1833f236218bSVlad Yasevich else 1834cb5e173eSMarcelo Ricardo Leitner kt = ktime_get_real(); 1835f236218bSVlad Yasevich 183667cb9366SDaniel Borkmann if (!asoc && ktime_before(bear_cookie->expiration, kt)) { 18378914f4baSMarcelo Ricardo Leitner suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); 18388914f4baSMarcelo Ricardo Leitner __be32 n = htonl(usecs); 18398914f4baSMarcelo Ricardo Leitner 18401da177e4SLinus Torvalds /* 18411da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 18421da177e4SLinus Torvalds * 18431da177e4SLinus Torvalds * Cause of error 18441da177e4SLinus Torvalds * --------------- 18451da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 18461da177e4SLinus Torvalds * Cookie that has expired. 18471da177e4SLinus Torvalds */ 18488914f4baSMarcelo Ricardo Leitner *errp = sctp_make_op_error(asoc, chunk, 18498914f4baSMarcelo Ricardo Leitner SCTP_ERROR_STALE_COOKIE, &n, 18508914f4baSMarcelo Ricardo Leitner sizeof(n), 0); 18518914f4baSMarcelo Ricardo Leitner if (*errp) 18521da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 18538914f4baSMarcelo Ricardo Leitner else 18541da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18551da177e4SLinus Torvalds 18561da177e4SLinus Torvalds goto fail; 18571da177e4SLinus Torvalds } 18581da177e4SLinus Torvalds 18591da177e4SLinus Torvalds /* Make a new base association. */ 18601da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 18611da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 18621da177e4SLinus Torvalds if (!retval) { 18631da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18641da177e4SLinus Torvalds goto fail; 18651da177e4SLinus Torvalds } 18661da177e4SLinus Torvalds 18671da177e4SLinus Torvalds /* Set up our peer's port number. */ 18681da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 18691da177e4SLinus Torvalds 18701da177e4SLinus Torvalds /* Populate the association from the cookie. */ 18711da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 18721da177e4SLinus Torvalds 18731da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 18741da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 18751da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18761da177e4SLinus Torvalds goto fail; 18771da177e4SLinus Torvalds } 18781da177e4SLinus Torvalds 18791da177e4SLinus Torvalds /* Also, add the destination address. */ 18801da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1881f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1882133800d1SMarcelo Ricardo Leitner sizeof(chunk->dest), SCTP_ADDR_SRC, 1883133800d1SMarcelo Ricardo Leitner GFP_ATOMIC); 18841da177e4SLinus Torvalds } 18851da177e4SLinus Torvalds 18861da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 18871da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 18881da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 1889cc16f00fSXin Long retval->strreset_outseq = retval->c.initial_tsn; 18901da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 18911da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 18920f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 18931da177e4SLinus Torvalds 18941da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 18951da177e4SLinus Torvalds return retval; 18961da177e4SLinus Torvalds 18971da177e4SLinus Torvalds fail: 18981da177e4SLinus Torvalds if (retval) 18991da177e4SLinus Torvalds sctp_association_free(retval); 19001da177e4SLinus Torvalds 19011da177e4SLinus Torvalds return NULL; 19021da177e4SLinus Torvalds 19031da177e4SLinus Torvalds malformed: 19041da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 19051da177e4SLinus Torvalds * malformed. 19061da177e4SLinus Torvalds */ 19071da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 19081da177e4SLinus Torvalds goto fail; 19091da177e4SLinus Torvalds } 19101da177e4SLinus Torvalds 19111da177e4SLinus Torvalds /******************************************************************** 19121da177e4SLinus Torvalds * 3rd Level Abstractions 19131da177e4SLinus Torvalds ********************************************************************/ 19141da177e4SLinus Torvalds 19151da177e4SLinus Torvalds struct __sctp_missing { 19169f81bcd9SAl Viro __be32 num_missing; 19179f81bcd9SAl Viro __be16 type; 1918bc10502dSEric Dumazet } __packed; 19191da177e4SLinus Torvalds 19201da177e4SLinus Torvalds /* 19211da177e4SLinus Torvalds * Report a missing mandatory parameter. 19221da177e4SLinus Torvalds */ 19231da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 192434b4e29bSXin Long enum sctp_param paramtype, 19251da177e4SLinus Torvalds struct sctp_chunk *chunk, 19261da177e4SLinus Torvalds struct sctp_chunk **errp) 19271da177e4SLinus Torvalds { 19281da177e4SLinus Torvalds struct __sctp_missing report; 19291da177e4SLinus Torvalds __u16 len; 19301da177e4SLinus Torvalds 1931e2f036a9SMarcelo Ricardo Leitner len = SCTP_PAD4(sizeof(report)); 19321da177e4SLinus Torvalds 19331da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 19341da177e4SLinus Torvalds * returning multiple unknown parameters. 19351da177e4SLinus Torvalds */ 19361da177e4SLinus Torvalds if (!*errp) 19371da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19381da177e4SLinus Torvalds 19391da177e4SLinus Torvalds if (*errp) { 19401da177e4SLinus Torvalds report.num_missing = htonl(1); 19411da177e4SLinus Torvalds report.type = paramtype; 1942ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 194300f1c2dfSWei Yongjun sizeof(report)); 194400f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 19451da177e4SLinus Torvalds } 19461da177e4SLinus Torvalds 19471da177e4SLinus Torvalds /* Stop processing this chunk. */ 19481da177e4SLinus Torvalds return 0; 19491da177e4SLinus Torvalds } 19501da177e4SLinus Torvalds 19511da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 19521da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 19531da177e4SLinus Torvalds struct sctp_chunk *chunk, 19541da177e4SLinus Torvalds struct sctp_chunk **errp) 19551da177e4SLinus Torvalds { 19561da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 19571da177e4SLinus Torvalds 19581da177e4SLinus Torvalds if (!*errp) 19591da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 19601da177e4SLinus Torvalds 19611da177e4SLinus Torvalds if (*errp) 196200f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 19631da177e4SLinus Torvalds 19641da177e4SLinus Torvalds /* Stop processing this chunk. */ 19651da177e4SLinus Torvalds return 0; 19661da177e4SLinus Torvalds } 19671da177e4SLinus Torvalds 19681da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 19691da177e4SLinus Torvalds struct sctp_paramhdr *param, 19701da177e4SLinus Torvalds const struct sctp_chunk *chunk, 19711da177e4SLinus Torvalds struct sctp_chunk **errp) 19721da177e4SLinus Torvalds { 19737ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 19747ab90804SVlad Yasevich * not reported. 19757ab90804SVlad Yasevich */ 19767ab90804SVlad Yasevich if (*errp) 19777ab90804SVlad Yasevich sctp_chunk_free(*errp); 19787ab90804SVlad Yasevich 19791da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1980ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 19811da177e4SLinus Torvalds 19821da177e4SLinus Torvalds return 0; 19831da177e4SLinus Torvalds } 19841da177e4SLinus Torvalds 19851da177e4SLinus Torvalds 19861da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 19871da177e4SLinus Torvalds * send back an indicator to the peer. 19881da177e4SLinus Torvalds */ 19891da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 19901da177e4SLinus Torvalds union sctp_params param, 19911da177e4SLinus Torvalds struct sctp_chunk *chunk, 19921da177e4SLinus Torvalds struct sctp_chunk **errp) 19931da177e4SLinus Torvalds { 19941da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 19951da177e4SLinus Torvalds 19967ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 19977ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 19987ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 19997ab90804SVlad Yasevich * them in the ABORT. 20007ab90804SVlad Yasevich */ 20017ab90804SVlad Yasevich if (*errp) 20027ab90804SVlad Yasevich sctp_chunk_free(*errp); 20037ab90804SVlad Yasevich 20048914f4baSMarcelo Ricardo Leitner *errp = sctp_make_op_error(asoc, chunk, SCTP_ERROR_DNS_FAILED, 20058914f4baSMarcelo Ricardo Leitner param.v, len, 0); 20061da177e4SLinus Torvalds 20071da177e4SLinus Torvalds /* Stop processing this chunk. */ 20081da177e4SLinus Torvalds return 0; 20091da177e4SLinus Torvalds } 20101da177e4SLinus Torvalds 20114e27428fSXin Long static int sctp_verify_ext_param(struct net *net, 20124e27428fSXin Long const struct sctp_endpoint *ep, 20134e27428fSXin Long union sctp_params param) 2014d6701191SVlad Yasevich { 20153c918704SXin Long __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 2016d6701191SVlad Yasevich int have_asconf = 0; 2017327c0dabSXin Long int have_auth = 0; 2018d6701191SVlad Yasevich int i; 2019d6701191SVlad Yasevich 2020d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 2021d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 2022d6701191SVlad Yasevich case SCTP_CID_AUTH: 2023d6701191SVlad Yasevich have_auth = 1; 2024d6701191SVlad Yasevich break; 2025d6701191SVlad Yasevich case SCTP_CID_ASCONF: 2026d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 2027d6701191SVlad Yasevich have_asconf = 1; 2028d6701191SVlad Yasevich break; 2029d6701191SVlad Yasevich } 2030d6701191SVlad Yasevich } 2031d6701191SVlad Yasevich 2032d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 2033d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 2034d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 2035d6701191SVlad Yasevich * mode. 2036d6701191SVlad Yasevich */ 2037e1fc3b14SEric W. Biederman if (net->sctp.addip_noauth) 2038d6701191SVlad Yasevich return 1; 2039d6701191SVlad Yasevich 20404e27428fSXin Long if (ep->asconf_enable && !have_auth && have_asconf) 2041d6701191SVlad Yasevich return 0; 2042d6701191SVlad Yasevich 2043d6701191SVlad Yasevich return 1; 2044d6701191SVlad Yasevich } 2045d6701191SVlad Yasevich 2046131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 2047131a47e3SVlad Yasevich union sctp_params param) 2048131a47e3SVlad Yasevich { 20493c918704SXin Long __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 2050131a47e3SVlad Yasevich int i; 2051131a47e3SVlad Yasevich 2052131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 2053131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 2054c28445c3SXin Long case SCTP_CID_RECONF: 2055a96701fbSXin Long if (asoc->ep->reconf_enable) 2056c28445c3SXin Long asoc->peer.reconf_capable = 1; 2057c28445c3SXin Long break; 2058131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 20591c134753SXin Long if (asoc->ep->prsctp_enable) 2060131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 2061131a47e3SVlad Yasevich break; 2062730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 2063730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 2064730fc3d0SVlad Yasevich * supports AUTH. 2065730fc3d0SVlad Yasevich */ 2066b14878ccSVlad Yasevich if (asoc->ep->auth_enable) 2067730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 2068730fc3d0SVlad Yasevich break; 2069131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 2070131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 20714e27428fSXin Long if (asoc->ep->asconf_enable) 207288799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 20736b2f9cb6SVlad Yasevich break; 207496b120b3SXin Long case SCTP_CID_I_DATA: 2075e55f4b8bSXin Long if (asoc->ep->intl_enable) 2076da1f6d4dSXin Long asoc->peer.intl_capable = 1; 207796b120b3SXin Long break; 2078131a47e3SVlad Yasevich default: 2079131a47e3SVlad Yasevich break; 2080131a47e3SVlad Yasevich } 2081131a47e3SVlad Yasevich } 2082131a47e3SVlad Yasevich } 2083131a47e3SVlad Yasevich 20841da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 20851da177e4SLinus Torvalds * 20861da177e4SLinus Torvalds * The Parameter Types are encoded such that the 20871da177e4SLinus Torvalds * highest-order two bits specify the action that must be 20881da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 20891da177e4SLinus Torvalds * Parameter Type. 20901da177e4SLinus Torvalds * 20917ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 20927ab90804SVlad Yasevich * parameters within this chunk 20931da177e4SLinus Torvalds * 20947ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 20957ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 20967ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 20971da177e4SLinus Torvalds * 20981da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 20991da177e4SLinus Torvalds * 21001da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 21011da177e4SLinus Torvalds * report the unrecognized parameter in an 21027ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 21031da177e4SLinus Torvalds * 21041da177e4SLinus Torvalds * Return value: 21057ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 21067ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 21077ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 21081da177e4SLinus Torvalds */ 21094785c7aeSXin Long static enum sctp_ierror sctp_process_unk_param( 21104785c7aeSXin Long const struct sctp_association *asoc, 21111da177e4SLinus Torvalds union sctp_params param, 21121da177e4SLinus Torvalds struct sctp_chunk *chunk, 21131da177e4SLinus Torvalds struct sctp_chunk **errp) 21141da177e4SLinus Torvalds { 21157ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 21161da177e4SLinus Torvalds 21171da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 21181da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 21197ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 21201da177e4SLinus Torvalds break; 21211da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 21221da177e4SLinus Torvalds break; 21237ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 21247ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 2125df561f66SGustavo A. R. Silva fallthrough; 21261da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 21271da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 21281da177e4SLinus Torvalds * returning multiple unknown parameters. 21291da177e4SLinus Torvalds */ 21308914f4baSMarcelo Ricardo Leitner if (!*errp) { 21318914f4baSMarcelo Ricardo Leitner *errp = sctp_make_op_error_limited(asoc, chunk); 21328914f4baSMarcelo Ricardo Leitner if (!*errp) { 21338914f4baSMarcelo Ricardo Leitner /* If there is no memory for generating the 21348914f4baSMarcelo Ricardo Leitner * ERROR report as specified, an ABORT will be 21358914f4baSMarcelo Ricardo Leitner * triggered to the peer and the association 21368914f4baSMarcelo Ricardo Leitner * won't be established. 21371da177e4SLinus Torvalds */ 21387ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 21398914f4baSMarcelo Ricardo Leitner break; 21401da177e4SLinus Torvalds } 21418914f4baSMarcelo Ricardo Leitner } 21428914f4baSMarcelo Ricardo Leitner 21438914f4baSMarcelo Ricardo Leitner if (!sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, 21448914f4baSMarcelo Ricardo Leitner ntohs(param.p->length))) 21458914f4baSMarcelo Ricardo Leitner sctp_addto_chunk(*errp, ntohs(param.p->length), 21468914f4baSMarcelo Ricardo Leitner param.v); 21471da177e4SLinus Torvalds break; 21481da177e4SLinus Torvalds default: 21491da177e4SLinus Torvalds break; 21501da177e4SLinus Torvalds } 21511da177e4SLinus Torvalds 21521da177e4SLinus Torvalds return retval; 21531da177e4SLinus Torvalds } 21541da177e4SLinus Torvalds 21557ab90804SVlad Yasevich /* Verify variable length parameters 21561da177e4SLinus Torvalds * Return values: 21577ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 21587ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 21597ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 21607ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 21611da177e4SLinus Torvalds */ 21624785c7aeSXin Long static enum sctp_ierror sctp_verify_param(struct net *net, 2163b14878ccSVlad Yasevich const struct sctp_endpoint *ep, 2164f53b5b09SEric W. Biederman const struct sctp_association *asoc, 21651da177e4SLinus Torvalds union sctp_params param, 21666d85e68fSXin Long enum sctp_cid cid, 21671da177e4SLinus Torvalds struct sctp_chunk *chunk, 21681da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 21691da177e4SLinus Torvalds { 217072da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 21717ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 217272da7b38SWei Yongjun __u16 n_elt, id = 0; 217372da7b38SWei Yongjun int i; 21741da177e4SLinus Torvalds 21751da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 21761da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 21771da177e4SLinus Torvalds * identified based on the chunk id. 21781da177e4SLinus Torvalds */ 21791da177e4SLinus Torvalds 21801da177e4SLinus Torvalds switch (param.p->type) { 21811da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 21821da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 21831da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 21841da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 21851da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 21861da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 21871da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 21881da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 21890f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2190d6701191SVlad Yasevich break; 2191d6701191SVlad Yasevich 2192131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 21934e27428fSXin Long if (!sctp_verify_ext_param(net, ep, param)) 2194d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 21951da177e4SLinus Torvalds break; 21961da177e4SLinus Torvalds 2197d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2198ef6c8d6cSMarcelo Ricardo Leitner if (!ep->asconf_enable) 219948f9bcf9SJoe Perches goto unhandled; 2200d6de3097SVlad Yasevich 2201ef6c8d6cSMarcelo Ricardo Leitner if (ntohs(param.p->length) < sizeof(struct sctp_addip_param) + 2202ef6c8d6cSMarcelo Ricardo Leitner sizeof(struct sctp_paramhdr)) { 2203ef6c8d6cSMarcelo Ricardo Leitner sctp_process_inv_paramlength(asoc, param.p, 2204ef6c8d6cSMarcelo Ricardo Leitner chunk, err_chunk); 2205ef6c8d6cSMarcelo Ricardo Leitner retval = SCTP_IERROR_ABORT; 2206ef6c8d6cSMarcelo Ricardo Leitner } 2207ef6c8d6cSMarcelo Ricardo Leitner break; 2208ef6c8d6cSMarcelo Ricardo Leitner 22091da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 2210bd4b2818SXin Long /* This param has been Deprecated, send ABORT. */ 22117ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 22127ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 22137ab90804SVlad Yasevich break; 2214131a47e3SVlad Yasevich 22151da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 221628aa4c26SXin Long if (ep->prsctp_enable) 22171da177e4SLinus Torvalds break; 221848f9bcf9SJoe Perches goto unhandled; 2219730fc3d0SVlad Yasevich 2220730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2221b14878ccSVlad Yasevich if (!ep->auth_enable) 222248f9bcf9SJoe Perches goto unhandled; 2223730fc3d0SVlad Yasevich 2224730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2225730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2226730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2227730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2228730fc3d0SVlad Yasevich */ 22298914f4baSMarcelo Ricardo Leitner if (SCTP_AUTH_RANDOM_LENGTH != ntohs(param.p->length) - 22308914f4baSMarcelo Ricardo Leitner sizeof(struct sctp_paramhdr)) { 22317ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2232730fc3d0SVlad Yasevich chunk, err_chunk); 22337ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 22347ab90804SVlad Yasevich } 2235730fc3d0SVlad Yasevich break; 2236730fc3d0SVlad Yasevich 2237730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2238b14878ccSVlad Yasevich if (!ep->auth_enable) 223948f9bcf9SJoe Perches goto unhandled; 2240730fc3d0SVlad Yasevich 2241730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2242730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2243730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2244730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2245730fc3d0SVlad Yasevich */ 22467ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 22477ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2248730fc3d0SVlad Yasevich chunk, err_chunk); 22497ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 22507ab90804SVlad Yasevich } 2251730fc3d0SVlad Yasevich break; 2252730fc3d0SVlad Yasevich 2253730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2254b14878ccSVlad Yasevich if (!ep->auth_enable) 225548f9bcf9SJoe Perches goto unhandled; 225672da7b38SWei Yongjun 225772da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 22583c918704SXin Long n_elt = (ntohs(param.p->length) - 22593c918704SXin Long sizeof(struct sctp_paramhdr)) >> 1; 226072da7b38SWei Yongjun 226172da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 226272da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 226372da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 226472da7b38SWei Yongjun */ 226572da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 226672da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 226772da7b38SWei Yongjun 226872da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2269730fc3d0SVlad Yasevich break; 227072da7b38SWei Yongjun } 227172da7b38SWei Yongjun 227272da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 227372da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 227472da7b38SWei Yongjun err_chunk); 227572da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 227672da7b38SWei Yongjun } 227772da7b38SWei Yongjun break; 227848f9bcf9SJoe Perches unhandled: 22791da177e4SLinus Torvalds default: 2280bb33381dSDaniel Borkmann pr_debug("%s: unrecognized param:%d for chunk:%d\n", 2281bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), cid); 2282bb33381dSDaniel Borkmann 22837ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 22841da177e4SLinus Torvalds break; 22851da177e4SLinus Torvalds } 22861da177e4SLinus Torvalds return retval; 22871da177e4SLinus Torvalds } 22881da177e4SLinus Torvalds 22891da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 2290b14878ccSVlad Yasevich int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 22916d85e68fSXin Long const struct sctp_association *asoc, enum sctp_cid cid, 229201a992beSXin Long struct sctp_init_chunk *peer_init, 229301a992beSXin Long struct sctp_chunk *chunk, struct sctp_chunk **errp) 22941da177e4SLinus Torvalds { 22951da177e4SLinus Torvalds union sctp_params param; 22967613f5feSDaniel Borkmann bool has_cookie = false; 22977ab90804SVlad Yasevich int result; 22981da177e4SLinus Torvalds 22997613f5feSDaniel Borkmann /* Check for missing mandatory parameters. Note: Initial TSN is 23007613f5feSDaniel Borkmann * also mandatory, but is not checked here since the valid range 23017613f5feSDaniel Borkmann * is 0..2**32-1. RFC4960, section 3.3.3. 23027613f5feSDaniel Borkmann */ 23037613f5feSDaniel Borkmann if (peer_init->init_hdr.num_outbound_streams == 0 || 23047613f5feSDaniel Borkmann peer_init->init_hdr.num_inbound_streams == 0 || 23057613f5feSDaniel Borkmann peer_init->init_hdr.init_tag == 0 || 23067613f5feSDaniel Borkmann ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) 23077ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 23081da177e4SLinus Torvalds 2309*add7370aSXin Long sctp_walk_params(param, peer_init) { 23107613f5feSDaniel Borkmann if (param.p->type == SCTP_PARAM_STATE_COOKIE) 23117613f5feSDaniel Borkmann has_cookie = true; 23127613f5feSDaniel Borkmann } 23131da177e4SLinus Torvalds 23141da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 23151da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 23161da177e4SLinus Torvalds * The current param.p would point at the bad one. 23171da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 23181da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 23191da177e4SLinus Torvalds * error handling code build and send the packet. 23201da177e4SLinus Torvalds */ 23217ab90804SVlad Yasevich if (param.v != (void *)chunk->chunk_end) 23227ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 23231da177e4SLinus Torvalds 23241da177e4SLinus Torvalds /* The only missing mandatory param possible today is 23251da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 23261da177e4SLinus Torvalds */ 23277ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 23287ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 23291da177e4SLinus Torvalds chunk, errp); 23301da177e4SLinus Torvalds 23317ab90804SVlad Yasevich /* Verify all the variable length parameters */ 2332*add7370aSXin Long sctp_walk_params(param, peer_init) { 2333b14878ccSVlad Yasevich result = sctp_verify_param(net, ep, asoc, param, cid, 2334b14878ccSVlad Yasevich chunk, errp); 23357ab90804SVlad Yasevich switch (result) { 23367ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 23377ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 23381da177e4SLinus Torvalds return 0; 23397ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 23401da177e4SLinus Torvalds return 1; 23417ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 23427ab90804SVlad Yasevich default: 23437ab90804SVlad Yasevich break; 23441da177e4SLinus Torvalds } 23451da177e4SLinus Torvalds 23461da177e4SLinus Torvalds } /* for (loop through all parameters) */ 23471da177e4SLinus Torvalds 23481da177e4SLinus Torvalds return 1; 23491da177e4SLinus Torvalds } 23501da177e4SLinus Torvalds 23511da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 23521da177e4SLinus Torvalds * Returns 0 on failure, else success. 23531da177e4SLinus Torvalds * FIXME: This is an association method. 23541da177e4SLinus Torvalds */ 2355de6becdcSWei Yongjun int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, 23561da177e4SLinus Torvalds const union sctp_addr *peer_addr, 235701a992beSXin Long struct sctp_init_chunk *peer_init, gfp_t gfp) 23581da177e4SLinus Torvalds { 23591da177e4SLinus Torvalds struct sctp_transport *transport; 23601da177e4SLinus Torvalds struct list_head *pos, *temp; 2361327c0dabSXin Long union sctp_params param; 2362de6becdcSWei Yongjun union sctp_addr addr; 2363327c0dabSXin Long struct sctp_af *af; 2364de6becdcSWei Yongjun int src_match = 0; 23651da177e4SLinus Torvalds 23661da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 23671da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 23681da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 23691da177e4SLinus Torvalds * of the INIT from the cookie. 23701da177e4SLinus Torvalds */ 23711da177e4SLinus Torvalds 23721da177e4SLinus Torvalds /* This implementation defaults to making the first transport 23731da177e4SLinus Torvalds * added as the primary transport. The source address seems to 237414f45bb7SRandy Dunlap * be a better choice than any of the embedded addresses. 23751da177e4SLinus Torvalds */ 2376a1dd2cf2SXin Long asoc->encap_port = SCTP_INPUT_CB(chunk->skb)->encap_port; 23776a1e5f33SAl Viro if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 23781da177e4SLinus Torvalds goto nomem; 2379de6becdcSWei Yongjun 2380de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) 2381de6becdcSWei Yongjun src_match = 1; 23821da177e4SLinus Torvalds 23831da177e4SLinus Torvalds /* Process the initialization parameters. */ 2384*add7370aSXin Long sctp_walk_params(param, peer_init) { 23850c5dc070SMarcelo Ricardo Leitner if (!src_match && 23860c5dc070SMarcelo Ricardo Leitner (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 2387de6becdcSWei Yongjun param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { 2388de6becdcSWei Yongjun af = sctp_get_af_specific(param_type2af(param.p->type)); 23890c5dc070SMarcelo Ricardo Leitner if (!af->from_addr_param(&addr, param.addr, 23900c5dc070SMarcelo Ricardo Leitner chunk->sctp_hdr->source, 0)) 23910c5dc070SMarcelo Ricardo Leitner continue; 2392de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) 2393de6becdcSWei Yongjun src_match = 1; 2394de6becdcSWei Yongjun } 23951da177e4SLinus Torvalds 23961da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 23971da177e4SLinus Torvalds goto clean_up; 23981da177e4SLinus Torvalds } 23991da177e4SLinus Torvalds 2400de6becdcSWei Yongjun /* source address of chunk may not match any valid address */ 2401de6becdcSWei Yongjun if (!src_match) 2402de6becdcSWei Yongjun goto clean_up; 2403de6becdcSWei Yongjun 2404730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2405730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2406730fc3d0SVlad Yasevich */ 2407730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2408730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2409730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2410730fc3d0SVlad Yasevich 2411d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2412d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2413d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2414d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2415d6701191SVlad Yasevich * is what we'll do here. 24166b2f9cb6SVlad Yasevich */ 24174e7696d9SXin Long if (!asoc->base.net->sctp.addip_noauth && 241873d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 24196b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 24206b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 24216b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 242288799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2423d6701191SVlad Yasevich goto clean_up; 24246b2f9cb6SVlad Yasevich } 24256b2f9cb6SVlad Yasevich 24263f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 24273f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 24283f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 24293f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 24303f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 24313f7a87d2SFrank Filz } 24323f7a87d2SFrank Filz } 24333f7a87d2SFrank Filz 24341da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 24351da177e4SLinus Torvalds * order. 24361da177e4SLinus Torvalds */ 24371da177e4SLinus Torvalds asoc->peer.i.init_tag = 24381da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 24391da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 24401da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 24411da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 24421da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 24431da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 24441da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 24451da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 24461da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 24471da177e4SLinus Torvalds 2448cc16f00fSXin Long asoc->strreset_inseq = asoc->peer.i.initial_tsn; 2449cc16f00fSXin Long 24501da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 24511da177e4SLinus Torvalds * number of inbound streams. 24521da177e4SLinus Torvalds */ 24531da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 24541da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 24551da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 24561da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 24571da177e4SLinus Torvalds } 24581da177e4SLinus Torvalds 24591da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 24601da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 24611da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 24621da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 24631da177e4SLinus Torvalds } 24641da177e4SLinus Torvalds 24651da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 24661da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 24671da177e4SLinus Torvalds 24681da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 24691da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 24701da177e4SLinus Torvalds 24711da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 24721da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 24731da177e4SLinus Torvalds * advertised window). 24741da177e4SLinus Torvalds */ 24759dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 24769dbc15f0SRobert P. J. Day transports) { 24771da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 24781da177e4SLinus Torvalds } 24791da177e4SLinus Torvalds 24801da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 24818e1ee18cSVlad Yasevich if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 24828e1ee18cSVlad Yasevich asoc->peer.i.initial_tsn, gfp)) 24838e1ee18cSVlad Yasevich goto clean_up; 24841da177e4SLinus Torvalds 24851da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 24861da177e4SLinus Torvalds * 24871da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 24881da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 24891da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 24901da177e4SLinus Torvalds * stream sequence number shall be set to 0. 24911da177e4SLinus Torvalds */ 24921da177e4SLinus Torvalds 2493ff356414SXin Long if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams, 2494ff356414SXin Long asoc->c.sinit_max_instreams, gfp)) 24951da177e4SLinus Torvalds goto clean_up; 24961da177e4SLinus Torvalds 24974135cce7SXin Long /* Update frag_point when stream_interleave may get changed. */ 24984135cce7SXin Long sctp_assoc_update_frag_point(asoc); 24994135cce7SXin Long 25007e062977SXin Long if (!asoc->temp && sctp_assoc_set_id(asoc, gfp)) 25011da177e4SLinus Torvalds goto clean_up; 25021da177e4SLinus Torvalds 25031da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 25041da177e4SLinus Torvalds * 25051da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 25061da177e4SLinus Torvalds * remote endpoint it should do the following: 25071da177e4SLinus Torvalds * ... 25081da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 25091da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 25101da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 25111da177e4SLinus Torvalds * association to the same value as the Initial TSN. 25121da177e4SLinus Torvalds */ 25131da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 25141da177e4SLinus Torvalds return 1; 25151da177e4SLinus Torvalds 25161da177e4SLinus Torvalds clean_up: 25171da177e4SLinus Torvalds /* Release the transport structures. */ 25181da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 25191da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2520add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2521add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 25221da177e4SLinus Torvalds } 25233f7a87d2SFrank Filz 25241da177e4SLinus Torvalds nomem: 25251da177e4SLinus Torvalds return 0; 25261da177e4SLinus Torvalds } 25271da177e4SLinus Torvalds 25281da177e4SLinus Torvalds 25291da177e4SLinus Torvalds /* Update asoc with the option described in param. 25301da177e4SLinus Torvalds * 25311da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 25321da177e4SLinus Torvalds * 25331da177e4SLinus Torvalds * asoc is the association to update. 25341da177e4SLinus Torvalds * param is the variable length parameter to use for update. 25351da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 25361da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 25371da177e4SLinus Torvalds * work we do. In particular, we should not build transport 25381da177e4SLinus Torvalds * structures for the addresses. 25391da177e4SLinus Torvalds */ 25401da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 25411da177e4SLinus Torvalds union sctp_params param, 25421da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2543dd0fc66fSAl Viro gfp_t gfp) 25441da177e4SLinus Torvalds { 2545327c0dabSXin Long struct sctp_endpoint *ep = asoc->ep; 2546d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 25474e7696d9SXin Long struct net *net = asoc->base.net; 2548d6de3097SVlad Yasevich struct sctp_transport *t; 2549327c0dabSXin Long enum sctp_scope scope; 2550327c0dabSXin Long union sctp_addr addr; 2551327c0dabSXin Long struct sctp_af *af; 2552327c0dabSXin Long int retval = 1, i; 2553327c0dabSXin Long u32 stale; 2554327c0dabSXin Long __u16 sat; 25551da177e4SLinus Torvalds 25561da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 25571da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 25581da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 25591da177e4SLinus Torvalds */ 25601da177e4SLinus Torvalds switch (param.p->type) { 25611da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25621da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 25631da177e4SLinus Torvalds break; 25647dab83deSVlad Yasevich goto do_addr_param; 25657dab83deSVlad Yasevich 25661da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25677dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 25687dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 25697dab83deSVlad Yasevich break; 25707dab83deSVlad Yasevich do_addr_param: 25711da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 25720c5dc070SMarcelo Ricardo Leitner if (!af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0)) 25730c5dc070SMarcelo Ricardo Leitner break; 25741da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2575e7ff4a70SEric W. Biederman if (sctp_in_scope(net, &addr, scope)) 2576dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 25771da177e4SLinus Torvalds return 0; 25781da177e4SLinus Torvalds break; 25791da177e4SLinus Torvalds 25801da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 2581e1fc3b14SEric W. Biederman if (!net->sctp.cookie_preserve_enable) 25821da177e4SLinus Torvalds break; 25831da177e4SLinus Torvalds 25841da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 25851da177e4SLinus Torvalds 25861da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 25871da177e4SLinus Torvalds * (1/1000sec). 25881da177e4SLinus Torvalds */ 258952db882fSDaniel Borkmann asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); 25901da177e4SLinus Torvalds break; 25911da177e4SLinus Torvalds 25921da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 25931da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 25941da177e4SLinus Torvalds * ones are really set by the peer. 25951da177e4SLinus Torvalds */ 25961da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 25971da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 25981da177e4SLinus Torvalds 2599140ee960SGui Jianfeng /* Assume that peer supports the address family 2600140ee960SGui Jianfeng * by which it sends a packet. 2601140ee960SGui Jianfeng */ 2602140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2603140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2604140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2605140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2606140ee960SGui Jianfeng 26071da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 26083c918704SXin Long sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 26091da177e4SLinus Torvalds if (sat) 26101da177e4SLinus Torvalds sat /= sizeof(__u16); 26111da177e4SLinus Torvalds 26121da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 26131da177e4SLinus Torvalds switch (param.sat->types[i]) { 26141da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 26151da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 26161da177e4SLinus Torvalds break; 26171da177e4SLinus Torvalds 26181da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 26196e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 26201da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 26211da177e4SLinus Torvalds break; 26221da177e4SLinus Torvalds 26231da177e4SLinus Torvalds default: /* Just ignore anything else. */ 26241da177e4SLinus Torvalds break; 26253ff50b79SStephen Hemminger } 26261da177e4SLinus Torvalds } 26271da177e4SLinus Torvalds break; 26281da177e4SLinus Torvalds 26291da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 26301da177e4SLinus Torvalds asoc->peer.cookie_len = 26313c918704SXin Long ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 2632ce950f10SNeil Horman kfree(asoc->peer.cookie); 26330a8dd9f6SNeil Horman asoc->peer.cookie = kmemdup(param.cookie->body, asoc->peer.cookie_len, gfp); 26340a8dd9f6SNeil Horman if (!asoc->peer.cookie) 26350a8dd9f6SNeil Horman retval = 0; 26361da177e4SLinus Torvalds break; 26371da177e4SLinus Torvalds 26381da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 26391da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 26401da177e4SLinus Torvalds break; 26411da177e4SLinus Torvalds 26421da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 26431da177e4SLinus Torvalds /* Rejected during verify stage. */ 26441da177e4SLinus Torvalds break; 26451da177e4SLinus Torvalds 26461da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 26471b0b8114SXin Long if (asoc->ep->ecn_enable) { 26481da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 26491da177e4SLinus Torvalds break; 26501b0b8114SXin Long } 26511b0b8114SXin Long /* Fall Through */ 26521b0b8114SXin Long goto fall_through; 26531b0b8114SXin Long 26541da177e4SLinus Torvalds 26550f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2656e69c4e0fSVlad Yasevich asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); 26571da177e4SLinus Torvalds break; 26581da177e4SLinus Torvalds 2659d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 26604e27428fSXin Long if (!ep->asconf_enable) 26610ef46e28SVlad Yasevich goto fall_through; 26620ef46e28SVlad Yasevich 26638b32f234SXin Long addr_param = param.v + sizeof(struct sctp_addip_param); 2664d6de3097SVlad Yasevich 2665cfbf654eSSaran Maruti Ramanara af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 26660c5dc070SMarcelo Ricardo Leitner if (!af) 2667e40607cbSDaniel Borkmann break; 2668e40607cbSDaniel Borkmann 26690c5dc070SMarcelo Ricardo Leitner if (!af->from_addr_param(&addr, addr_param, 26700c5dc070SMarcelo Ricardo Leitner htons(asoc->peer.port), 0)) 26710c5dc070SMarcelo Ricardo Leitner break; 2672d6de3097SVlad Yasevich 2673d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2674d6de3097SVlad Yasevich break; 2675d6de3097SVlad Yasevich 2676d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2677d6de3097SVlad Yasevich if (!t) 2678d6de3097SVlad Yasevich break; 2679d6de3097SVlad Yasevich 2680d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2681d6de3097SVlad Yasevich break; 2682d6de3097SVlad Yasevich 2683131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2684131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2685131a47e3SVlad Yasevich break; 2686131a47e3SVlad Yasevich 26871da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 26881c134753SXin Long if (asoc->ep->prsctp_enable) { 26891da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 26901da177e4SLinus Torvalds break; 26911da177e4SLinus Torvalds } 26921da177e4SLinus Torvalds /* Fall Through */ 2693730fc3d0SVlad Yasevich goto fall_through; 2694730fc3d0SVlad Yasevich 2695730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2696b14878ccSVlad Yasevich if (!ep->auth_enable) 2697730fc3d0SVlad Yasevich goto fall_through; 2698730fc3d0SVlad Yasevich 2699730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2700ce950f10SNeil Horman kfree(asoc->peer.peer_random); 2701730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2702730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2703730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2704730fc3d0SVlad Yasevich retval = 0; 2705730fc3d0SVlad Yasevich break; 2706730fc3d0SVlad Yasevich } 2707730fc3d0SVlad Yasevich break; 2708730fc3d0SVlad Yasevich 2709730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2710b14878ccSVlad Yasevich if (!ep->auth_enable) 2711730fc3d0SVlad Yasevich goto fall_through; 2712730fc3d0SVlad Yasevich 2713730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2714ce950f10SNeil Horman kfree(asoc->peer.peer_hmacs); 2715730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2716730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2717730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2718730fc3d0SVlad Yasevich retval = 0; 2719730fc3d0SVlad Yasevich break; 2720730fc3d0SVlad Yasevich } 2721730fc3d0SVlad Yasevich 2722730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2723730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2724730fc3d0SVlad Yasevich break; 2725730fc3d0SVlad Yasevich 2726730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2727b14878ccSVlad Yasevich if (!ep->auth_enable) 2728730fc3d0SVlad Yasevich goto fall_through; 2729730fc3d0SVlad Yasevich 2730ce950f10SNeil Horman kfree(asoc->peer.peer_chunks); 2731730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2732730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2733730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2734730fc3d0SVlad Yasevich retval = 0; 2735730fc3d0SVlad Yasevich break; 2736730fc3d0SVlad Yasevich fall_through: 27371da177e4SLinus Torvalds default: 27381da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 27391da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 27401da177e4SLinus Torvalds * called prior to this routine. Simply log the error 27411da177e4SLinus Torvalds * here. 27421da177e4SLinus Torvalds */ 2743bb33381dSDaniel Borkmann pr_debug("%s: ignoring param:%d for association:%p.\n", 2744bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), asoc); 27451da177e4SLinus Torvalds break; 27463ff50b79SStephen Hemminger } 27471da177e4SLinus Torvalds 27481da177e4SLinus Torvalds return retval; 27491da177e4SLinus Torvalds } 27501da177e4SLinus Torvalds 27511da177e4SLinus Torvalds /* Select a new verification tag. */ 27521da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 27531da177e4SLinus Torvalds { 27541da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 27551da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 27561da177e4SLinus Torvalds */ 27571da177e4SLinus Torvalds __u32 x; 27581da177e4SLinus Torvalds 27591da177e4SLinus Torvalds do { 27601da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 27611da177e4SLinus Torvalds } while (x == 0); 27621da177e4SLinus Torvalds 27631da177e4SLinus Torvalds return x; 27641da177e4SLinus Torvalds } 27651da177e4SLinus Torvalds 27661da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 27671da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 27681da177e4SLinus Torvalds { 27691da177e4SLinus Torvalds __u32 retval; 27701da177e4SLinus Torvalds 27711da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 27721da177e4SLinus Torvalds return retval; 27731da177e4SLinus Torvalds } 27741da177e4SLinus Torvalds 27751da177e4SLinus Torvalds /* 27761da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 27771da177e4SLinus Torvalds * 0 1 2 3 27781da177e4SLinus 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 27791da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27801da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 27811da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27821da177e4SLinus Torvalds * | Serial Number | 27831da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27841da177e4SLinus Torvalds * | Address Parameter | 27851da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27861da177e4SLinus Torvalds * | ASCONF Parameter #1 | 27871da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27881da177e4SLinus Torvalds * \ \ 27891da177e4SLinus Torvalds * / .... / 27901da177e4SLinus Torvalds * \ \ 27911da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27921da177e4SLinus Torvalds * | ASCONF Parameter #N | 27931da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27941da177e4SLinus Torvalds * 27951da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 27961da177e4SLinus Torvalds */ 27971da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 27981da177e4SLinus Torvalds union sctp_addr *addr, 27991da177e4SLinus Torvalds int vparam_len) 28001da177e4SLinus Torvalds { 280165205cc4SXin Long struct sctp_addiphdr asconf; 28021da177e4SLinus Torvalds struct sctp_chunk *retval; 28031da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 28041da177e4SLinus Torvalds union sctp_addr_param addrparam; 28051da177e4SLinus Torvalds int addrlen; 28061da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 28071da177e4SLinus Torvalds 28081da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 28091da177e4SLinus Torvalds if (!addrlen) 28101da177e4SLinus Torvalds return NULL; 28111da177e4SLinus Torvalds length += addrlen; 28121da177e4SLinus Torvalds 28131da177e4SLinus Torvalds /* Create the chunk. */ 2814cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length, 2815cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 28161da177e4SLinus Torvalds if (!retval) 28171da177e4SLinus Torvalds return NULL; 28181da177e4SLinus Torvalds 28191da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 28201da177e4SLinus Torvalds 28211da177e4SLinus Torvalds retval->subh.addip_hdr = 28221da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 28231da177e4SLinus Torvalds retval->param_hdr.v = 28241da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 28251da177e4SLinus Torvalds 28261da177e4SLinus Torvalds return retval; 28271da177e4SLinus Torvalds } 28281da177e4SLinus Torvalds 28291da177e4SLinus Torvalds /* ADDIP 28301da177e4SLinus Torvalds * 3.2.1 Add IP Address 28311da177e4SLinus Torvalds * 0 1 2 3 28321da177e4SLinus 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 28331da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28341da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 28351da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28361da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28371da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28381da177e4SLinus Torvalds * | Address Parameter | 28391da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28401da177e4SLinus Torvalds * 28411da177e4SLinus Torvalds * 3.2.2 Delete IP Address 28421da177e4SLinus Torvalds * 0 1 2 3 28431da177e4SLinus 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 28441da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28451da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 28461da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28471da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28481da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28491da177e4SLinus Torvalds * | Address Parameter | 28501da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28511da177e4SLinus Torvalds * 28521da177e4SLinus Torvalds */ 28531da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 28541da177e4SLinus Torvalds union sctp_addr *laddr, 28551da177e4SLinus Torvalds struct sockaddr *addrs, 2856327c0dabSXin Long int addrcnt, __be16 flags) 28571da177e4SLinus Torvalds { 28581da177e4SLinus Torvalds union sctp_addr_param addr_param; 2859327c0dabSXin Long struct sctp_addip_param param; 28601da177e4SLinus Torvalds int paramlen = sizeof(param); 2861327c0dabSXin Long struct sctp_chunk *retval; 28621da177e4SLinus Torvalds int addr_param_len = 0; 2863327c0dabSXin Long union sctp_addr *addr; 2864327c0dabSXin Long int totallen = 0, i; 28658a07eb0aSMichio Honda int del_pickup = 0; 2866327c0dabSXin Long struct sctp_af *af; 2867327c0dabSXin Long void *addr_buf; 28681da177e4SLinus Torvalds 28691da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 28701da177e4SLinus Torvalds addr_buf = addrs; 28711da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2872ea110733SJoe Perches addr = addr_buf; 28731da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28741da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28751da177e4SLinus Torvalds 28761da177e4SLinus Torvalds totallen += paramlen; 28771da177e4SLinus Torvalds totallen += addr_param_len; 28781da177e4SLinus Torvalds 28791da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28808a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending && !del_pickup) { 28818a07eb0aSMichio Honda /* reuse the parameter length from the same scope one */ 28828a07eb0aSMichio Honda totallen += paramlen; 28838a07eb0aSMichio Honda totallen += addr_param_len; 28848a07eb0aSMichio Honda del_pickup = 1; 2885bb33381dSDaniel Borkmann 2886bb33381dSDaniel Borkmann pr_debug("%s: picked same-scope del_pending addr, " 2887bb33381dSDaniel Borkmann "totallen for all addresses is %d\n", 2888bb33381dSDaniel Borkmann __func__, totallen); 28898a07eb0aSMichio Honda } 28901da177e4SLinus Torvalds } 28911da177e4SLinus Torvalds 28921da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 28931da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 28941da177e4SLinus Torvalds if (!retval) 28951da177e4SLinus Torvalds return NULL; 28961da177e4SLinus Torvalds 28971da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 28981da177e4SLinus Torvalds addr_buf = addrs; 28991da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2900ea110733SJoe Perches addr = addr_buf; 29011da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 29021da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 29031da177e4SLinus Torvalds param.param_hdr.type = flags; 29041da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 2905978aa047SXin Long param.crr_id = htonl(i); 29061da177e4SLinus Torvalds 29071da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 29081da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 29091da177e4SLinus Torvalds 29101da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 29111da177e4SLinus Torvalds } 29128a07eb0aSMichio Honda if (flags == SCTP_PARAM_ADD_IP && del_pickup) { 29138a07eb0aSMichio Honda addr = asoc->asconf_addr_del_pending; 29148a07eb0aSMichio Honda af = sctp_get_af_specific(addr->v4.sin_family); 29158a07eb0aSMichio Honda addr_param_len = af->to_addr_param(addr, &addr_param); 29168a07eb0aSMichio Honda param.param_hdr.type = SCTP_PARAM_DEL_IP; 29178a07eb0aSMichio Honda param.param_hdr.length = htons(paramlen + addr_param_len); 2918978aa047SXin Long param.crr_id = htonl(i); 29198a07eb0aSMichio Honda 29208a07eb0aSMichio Honda sctp_addto_chunk(retval, paramlen, ¶m); 29218a07eb0aSMichio Honda sctp_addto_chunk(retval, addr_param_len, &addr_param); 29228a07eb0aSMichio Honda } 29231da177e4SLinus Torvalds return retval; 29241da177e4SLinus Torvalds } 29251da177e4SLinus Torvalds 29261da177e4SLinus Torvalds /* ADDIP 29271da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 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 =0xC004 | Length = Variable | 29321da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29331da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 29341da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29351da177e4SLinus Torvalds * | Address Parameter | 29361da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29371da177e4SLinus Torvalds * 29381da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 29391da177e4SLinus Torvalds */ 29401da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 29411da177e4SLinus Torvalds union sctp_addr *addr) 29421da177e4SLinus Torvalds { 2943327c0dabSXin Long struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 2944327c0dabSXin Long union sctp_addr_param addrparam; 29458b32f234SXin Long struct sctp_addip_param param; 29461da177e4SLinus Torvalds struct sctp_chunk *retval; 29471da177e4SLinus Torvalds int len = sizeof(param); 29481da177e4SLinus Torvalds int addrlen; 29491da177e4SLinus Torvalds 29501da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 29511da177e4SLinus Torvalds if (!addrlen) 29521da177e4SLinus Torvalds return NULL; 29531da177e4SLinus Torvalds len += addrlen; 29541da177e4SLinus Torvalds 29551da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 29561da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 29571da177e4SLinus Torvalds if (!retval) 29581da177e4SLinus Torvalds return NULL; 29591da177e4SLinus Torvalds 29601da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 29611da177e4SLinus Torvalds param.param_hdr.length = htons(len); 29621da177e4SLinus Torvalds param.crr_id = 0; 29631da177e4SLinus Torvalds 29641da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 29651da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 29661da177e4SLinus Torvalds 29671da177e4SLinus Torvalds return retval; 29681da177e4SLinus Torvalds } 29691da177e4SLinus Torvalds 29701da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 29711da177e4SLinus Torvalds * 0 1 2 3 29721da177e4SLinus 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 29731da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29741da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 29751da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29761da177e4SLinus Torvalds * | Serial Number | 29771da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29781da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 29791da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29801da177e4SLinus Torvalds * \ \ 29811da177e4SLinus Torvalds * / .... / 29821da177e4SLinus Torvalds * \ \ 29831da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29841da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 29851da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29861da177e4SLinus Torvalds * 29871da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 29881da177e4SLinus Torvalds */ 29891da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 29901da177e4SLinus Torvalds __u32 serial, int vparam_len) 29911da177e4SLinus Torvalds { 299265205cc4SXin Long struct sctp_addiphdr asconf; 29931da177e4SLinus Torvalds struct sctp_chunk *retval; 29941da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 29951da177e4SLinus Torvalds 29961da177e4SLinus Torvalds /* Create the chunk. */ 2997cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length, 2998cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 29991da177e4SLinus Torvalds if (!retval) 30001da177e4SLinus Torvalds return NULL; 30011da177e4SLinus Torvalds 30021da177e4SLinus Torvalds asconf.serial = htonl(serial); 30031da177e4SLinus Torvalds 30041da177e4SLinus Torvalds retval->subh.addip_hdr = 30051da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 30061da177e4SLinus Torvalds 30071da177e4SLinus Torvalds return retval; 30081da177e4SLinus Torvalds } 30091da177e4SLinus Torvalds 30101da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 30119f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 30128b32f234SXin Long __be16 err_code, 30138b32f234SXin Long struct sctp_addip_param *asconf_param) 30141da177e4SLinus Torvalds { 30158b32f234SXin Long struct sctp_addip_param ack_param; 3016d8238d9dSXin Long struct sctp_errhdr err_param; 30171da177e4SLinus Torvalds int asconf_param_len = 0; 30181da177e4SLinus Torvalds int err_param_len = 0; 3019dbc16db1SAl Viro __be16 response_type; 30201da177e4SLinus Torvalds 30211da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 30221da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 30231da177e4SLinus Torvalds } else { 30241da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 30251da177e4SLinus Torvalds err_param_len = sizeof(err_param); 30261da177e4SLinus Torvalds if (asconf_param) 30271da177e4SLinus Torvalds asconf_param_len = 30281da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 30291da177e4SLinus Torvalds } 30301da177e4SLinus Torvalds 30311da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 30321da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 30331da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 30341da177e4SLinus Torvalds err_param_len + 30351da177e4SLinus Torvalds asconf_param_len); 30361da177e4SLinus Torvalds ack_param.crr_id = crr_id; 30371da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 30381da177e4SLinus Torvalds 30391da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 30401da177e4SLinus Torvalds return; 30411da177e4SLinus Torvalds 30421da177e4SLinus Torvalds /* Add Error Cause parameter. */ 30431da177e4SLinus Torvalds err_param.cause = err_code; 30441da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 30451da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 30461da177e4SLinus Torvalds 30471da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 30481da177e4SLinus Torvalds if (asconf_param) 30491da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 30501da177e4SLinus Torvalds } 30511da177e4SLinus Torvalds 30521da177e4SLinus Torvalds /* Process a asconf parameter. */ 3053dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 30541da177e4SLinus Torvalds struct sctp_chunk *asconf, 30558b32f234SXin Long struct sctp_addip_param *asconf_param) 30561da177e4SLinus Torvalds { 30571da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3058327c0dabSXin Long struct sctp_transport *peer; 3059327c0dabSXin Long union sctp_addr addr; 3060327c0dabSXin Long struct sctp_af *af; 30611da177e4SLinus Torvalds 30628b32f234SXin Long addr_param = (void *)asconf_param + sizeof(*asconf_param); 3063c1cc678aSPatrick McHardy 306444e65c1eSWei Yongjun if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && 306544e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && 306644e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) 306744e65c1eSWei Yongjun return SCTP_ERROR_UNKNOWN_PARAM; 306844e65c1eSWei Yongjun 30696a435732SShan Wei switch (addr_param->p.type) { 3070c4492586SWei Yongjun case SCTP_PARAM_IPV6_ADDRESS: 3071c4492586SWei Yongjun if (!asoc->peer.ipv6_address) 3072945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3073c4492586SWei Yongjun break; 3074c4492586SWei Yongjun case SCTP_PARAM_IPV4_ADDRESS: 3075c4492586SWei Yongjun if (!asoc->peer.ipv4_address) 3076945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3077c4492586SWei Yongjun break; 3078c4492586SWei Yongjun default: 3079945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3080c4492586SWei Yongjun } 3081c4492586SWei Yongjun 30826a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 30831da177e4SLinus Torvalds if (unlikely(!af)) 3084945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 30851da177e4SLinus Torvalds 30860c5dc070SMarcelo Ricardo Leitner if (!af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0)) 30870c5dc070SMarcelo Ricardo Leitner return SCTP_ERROR_DNS_FAILED; 308842e30bf3SVlad Yasevich 308942e30bf3SVlad Yasevich /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast 309042e30bf3SVlad Yasevich * or multicast address. 309142e30bf3SVlad Yasevich * (note: wildcard is permitted and requires special handling so 309242e30bf3SVlad Yasevich * make sure we check for that) 309342e30bf3SVlad Yasevich */ 309442e30bf3SVlad Yasevich if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) 3095945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 309642e30bf3SVlad Yasevich 30971da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 30981da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 309942e30bf3SVlad Yasevich /* Section 4.2.1: 310042e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the source 310142e30bf3SVlad Yasevich * address of the packet MUST be added. 310242e30bf3SVlad Yasevich */ 310342e30bf3SVlad Yasevich if (af->is_any(&addr)) 310442e30bf3SVlad Yasevich memcpy(&addr, &asconf->source, sizeof(addr)); 310542e30bf3SVlad Yasevich 31062277c7cdSRichard Haines if (security_sctp_bind_connect(asoc->ep->base.sk, 31072277c7cdSRichard Haines SCTP_PARAM_ADD_IP, 31082277c7cdSRichard Haines (struct sockaddr *)&addr, 31092277c7cdSRichard Haines af->sockaddr_len)) 31102277c7cdSRichard Haines return SCTP_ERROR_REQ_REFUSED; 31112277c7cdSRichard Haines 31121da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 31131da177e4SLinus Torvalds * request and does not have the local resources to add this 31141da177e4SLinus Torvalds * new address to the association, it MUST return an Error 31151da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 31161da177e4SLinus Torvalds * Due to Resource Shortage'. 31171da177e4SLinus Torvalds */ 31181da177e4SLinus Torvalds 3119dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 31201da177e4SLinus Torvalds if (!peer) 31211da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 31221da177e4SLinus Torvalds 31231da177e4SLinus Torvalds /* Start the heartbeat timer. */ 3124ba6f5e33SMarcelo Ricardo Leitner sctp_transport_reset_hb_timer(peer); 31256af29cccSMichio Honda asoc->new_transport = peer; 31261da177e4SLinus Torvalds break; 31271da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 31281da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 31291da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 31301da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 31311da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 31321da177e4SLinus Torvalds */ 313342e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 31341da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 31351da177e4SLinus Torvalds 31361da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 31371da177e4SLinus Torvalds * address which is also the source address of the IP packet 31381da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 31391da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 31401da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 31411da177e4SLinus Torvalds * Delete Source IP Address' 31421da177e4SLinus Torvalds */ 3143b1364104SMichio Honda if (sctp_cmp_addr_exact(&asconf->source, &addr)) 31441da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 31451da177e4SLinus Torvalds 314642e30bf3SVlad Yasevich /* Section 4.2.2 314742e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 314842e30bf3SVlad Yasevich * addresses of the peer except the source address of the 314942e30bf3SVlad Yasevich * packet MUST be deleted. 315042e30bf3SVlad Yasevich */ 315142e30bf3SVlad Yasevich if (af->is_any(&addr)) { 315242e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 315342e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 315442e30bf3SVlad Yasevich asconf->transport); 31557c5a9461Slucien return SCTP_ERROR_NO_ERROR; 31567c5a9461Slucien } 31577c5a9461Slucien 31587c5a9461Slucien /* If the address is not part of the association, the 31597c5a9461Slucien * ASCONF-ACK with Error Cause Indication Parameter 31607c5a9461Slucien * which including cause of Unresolvable Address should 31617c5a9461Slucien * be sent. 31627c5a9461Slucien */ 31637c5a9461Slucien peer = sctp_assoc_lookup_paddr(asoc, &addr); 31647c5a9461Slucien if (!peer) 31657c5a9461Slucien return SCTP_ERROR_DNS_FAILED; 31667c5a9461Slucien 31677c5a9461Slucien sctp_assoc_rm_peer(asoc, peer); 31681da177e4SLinus Torvalds break; 31691da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 317042e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 317142e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 317242e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 317342e30bf3SVlad Yasevich * primary. 317442e30bf3SVlad Yasevich */ 317542e30bf3SVlad Yasevich if (af->is_any(&addr)) 3176e5272ad4SGustavo A. R. Silva memcpy(&addr, sctp_source(asconf), sizeof(addr)); 317742e30bf3SVlad Yasevich 31782277c7cdSRichard Haines if (security_sctp_bind_connect(asoc->ep->base.sk, 31792277c7cdSRichard Haines SCTP_PARAM_SET_PRIMARY, 31802277c7cdSRichard Haines (struct sockaddr *)&addr, 31812277c7cdSRichard Haines af->sockaddr_len)) 31822277c7cdSRichard Haines return SCTP_ERROR_REQ_REFUSED; 31832277c7cdSRichard Haines 3184dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 31851da177e4SLinus Torvalds if (!peer) 3186945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 31871da177e4SLinus Torvalds 31881da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 31891da177e4SLinus Torvalds break; 31901da177e4SLinus Torvalds } 31911da177e4SLinus Torvalds 31921da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 31931da177e4SLinus Torvalds } 31941da177e4SLinus Torvalds 31956f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 31969de7922bSDaniel Borkmann bool sctp_verify_asconf(const struct sctp_association *asoc, 31979de7922bSDaniel Borkmann struct sctp_chunk *chunk, bool addr_param_needed, 31989de7922bSDaniel Borkmann struct sctp_paramhdr **errp) 31999de7922bSDaniel Borkmann { 320068d75469SXin Long struct sctp_addip_chunk *addip; 32019de7922bSDaniel Borkmann bool addr_param_seen = false; 3202327c0dabSXin Long union sctp_params param; 32036f4c618dSWei Yongjun 320468d75469SXin Long addip = (struct sctp_addip_chunk *)chunk->chunk_hdr; 3205*add7370aSXin Long sctp_walk_params(param, addip) { 32069de7922bSDaniel Borkmann size_t length = ntohs(param.p->length); 32079de7922bSDaniel Borkmann 32086f4c618dSWei Yongjun *errp = param.p; 32096f4c618dSWei Yongjun switch (param.p->type) { 32109de7922bSDaniel Borkmann case SCTP_PARAM_ERR_CAUSE: 32119de7922bSDaniel Borkmann break; 32129de7922bSDaniel Borkmann case SCTP_PARAM_IPV4_ADDRESS: 3213a38905e6SXin Long if (length != sizeof(struct sctp_ipv4addr_param)) 32149de7922bSDaniel Borkmann return false; 3215ce7b4cccSlucien /* ensure there is only one addr param and it's in the 3216ce7b4cccSlucien * beginning of addip_hdr params, or we reject it. 3217ce7b4cccSlucien */ 3218*add7370aSXin Long if (param.v != (addip + 1)) 3219ce7b4cccSlucien return false; 32209de7922bSDaniel Borkmann addr_param_seen = true; 32219de7922bSDaniel Borkmann break; 32229de7922bSDaniel Borkmann case SCTP_PARAM_IPV6_ADDRESS: 322300987cc0SXin Long if (length != sizeof(struct sctp_ipv6addr_param)) 32249de7922bSDaniel Borkmann return false; 3225*add7370aSXin Long if (param.v != (addip + 1)) 3226ce7b4cccSlucien return false; 32279de7922bSDaniel Borkmann addr_param_seen = true; 32289de7922bSDaniel Borkmann break; 32296f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 32306f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 32316f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 32329de7922bSDaniel Borkmann /* In ASCONF chunks, these need to be first. */ 32339de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 32349de7922bSDaniel Borkmann return false; 32359de7922bSDaniel Borkmann length = ntohs(param.addip->param_hdr.length); 32368b32f234SXin Long if (length < sizeof(struct sctp_addip_param) + 32373c918704SXin Long sizeof(**errp)) 32389de7922bSDaniel Borkmann return false; 32396f4c618dSWei Yongjun break; 32406f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 32416f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 32428b32f234SXin Long if (length != sizeof(struct sctp_addip_param)) 32439de7922bSDaniel Borkmann return false; 32446f4c618dSWei Yongjun break; 32456f4c618dSWei Yongjun default: 324621c00a18SLu Wei /* This is unknown to us, reject! */ 32479de7922bSDaniel Borkmann return false; 32489de7922bSDaniel Borkmann } 32496f4c618dSWei Yongjun } 32506f4c618dSWei Yongjun 32519de7922bSDaniel Borkmann /* Remaining sanity checks. */ 32529de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 32539de7922bSDaniel Borkmann return false; 32549de7922bSDaniel Borkmann if (!addr_param_needed && addr_param_seen) 32559de7922bSDaniel Borkmann return false; 32569de7922bSDaniel Borkmann if (param.v != chunk->chunk_end) 32579de7922bSDaniel Borkmann return false; 32586f4c618dSWei Yongjun 32599de7922bSDaniel Borkmann return true; 32606f4c618dSWei Yongjun } 32616f4c618dSWei Yongjun 32621da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 32631da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 32641da177e4SLinus Torvalds */ 32651da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 32661da177e4SLinus Torvalds struct sctp_chunk *asconf) 32671da177e4SLinus Torvalds { 32681da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3269327c0dabSXin Long struct sctp_addip_chunk *addip; 32701da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 3271327c0dabSXin Long bool all_param_pass = true; 3272327c0dabSXin Long struct sctp_addiphdr *hdr; 3273327c0dabSXin Long int length = 0, chunk_len; 3274327c0dabSXin Long union sctp_params param; 3275dbc16db1SAl Viro __be16 err_code; 32761da177e4SLinus Torvalds __u32 serial; 32771da177e4SLinus Torvalds 327868d75469SXin Long addip = (struct sctp_addip_chunk *)asconf->chunk_hdr; 3279922dbc5bSXin Long chunk_len = ntohs(asconf->chunk_hdr->length) - 3280922dbc5bSXin Long sizeof(struct sctp_chunkhdr); 328165205cc4SXin Long hdr = (struct sctp_addiphdr *)asconf->skb->data; 32821da177e4SLinus Torvalds serial = ntohl(hdr->serial); 32831da177e4SLinus Torvalds 32841da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 328565205cc4SXin Long length = sizeof(*hdr); 32861da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 32871da177e4SLinus Torvalds chunk_len -= length; 32881da177e4SLinus Torvalds 32891da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 32907aa1b54bSJoe Perches * asconf parameter. 32911da177e4SLinus Torvalds */ 32926a435732SShan Wei length = ntohs(addr_param->p.length); 32931da177e4SLinus Torvalds chunk_len -= length; 32941da177e4SLinus Torvalds 32951da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 32961da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 32972cab86beSWei Yongjun * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF 32987aa1b54bSJoe Perches * parameters. 32991da177e4SLinus Torvalds */ 33002cab86beSWei Yongjun asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); 33011da177e4SLinus Torvalds if (!asconf_ack) 33021da177e4SLinus Torvalds goto done; 33031da177e4SLinus Torvalds 33041da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 3305*add7370aSXin Long sctp_walk_params(param, addip) { 33069de7922bSDaniel Borkmann /* Skip preceeding address parameters. */ 33079de7922bSDaniel Borkmann if (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 33089de7922bSDaniel Borkmann param.p->type == SCTP_PARAM_IPV6_ADDRESS) 33099de7922bSDaniel Borkmann continue; 33109de7922bSDaniel Borkmann 33111da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 33129de7922bSDaniel Borkmann param.addip); 33131da177e4SLinus Torvalds /* ADDIP 4.1 A7) 33141da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 33151da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 33161da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 33171da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 33181da177e4SLinus Torvalds * a specific success indication is present for the parameter. 33191da177e4SLinus Torvalds */ 33209de7922bSDaniel Borkmann if (err_code != SCTP_ERROR_NO_ERROR) 33219de7922bSDaniel Borkmann all_param_pass = false; 33221da177e4SLinus Torvalds if (!all_param_pass) 33239de7922bSDaniel Borkmann sctp_add_asconf_response(asconf_ack, param.addip->crr_id, 33249de7922bSDaniel Borkmann err_code, param.addip); 33251da177e4SLinus Torvalds 33261da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 33271da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 33281da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 33291da177e4SLinus Torvalds * in the ASCONF. 33301da177e4SLinus Torvalds */ 33319de7922bSDaniel Borkmann if (err_code == SCTP_ERROR_RSRC_LOW) 33321da177e4SLinus Torvalds goto done; 33331da177e4SLinus Torvalds } 33341da177e4SLinus Torvalds done: 33351da177e4SLinus Torvalds asoc->peer.addip_serial++; 33361da177e4SLinus Torvalds 33371da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 33381da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 33391da177e4SLinus Torvalds */ 33401da177e4SLinus Torvalds if (asconf_ack) { 33411da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3342a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3343a08de64dSVlad Yasevich &asoc->asconf_ack_list); 33441da177e4SLinus Torvalds } 33451da177e4SLinus Torvalds 33461da177e4SLinus Torvalds return asconf_ack; 33471da177e4SLinus Torvalds } 33481da177e4SLinus Torvalds 33491da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 3350425e0f68SWei Yongjun static void sctp_asconf_param_success(struct sctp_association *asoc, 33518b32f234SXin Long struct sctp_addip_param *asconf_param) 33521da177e4SLinus Torvalds { 33531da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 33541da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3355dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 3356327c0dabSXin Long struct sctp_transport *transport; 3357327c0dabSXin Long union sctp_addr addr; 3358327c0dabSXin Long struct sctp_af *af; 33591da177e4SLinus Torvalds 33608b32f234SXin Long addr_param = (void *)asconf_param + sizeof(*asconf_param); 33611da177e4SLinus Torvalds 33621da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 33636a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 33640c5dc070SMarcelo Ricardo Leitner if (!af->from_addr_param(&addr, addr_param, htons(bp->port), 0)) 33650c5dc070SMarcelo Ricardo Leitner return; 33661da177e4SLinus Torvalds 33671da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 33681da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3369559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3370559cf710SVlad Yasevich * held, so the list can not change. 3371559cf710SVlad Yasevich */ 33720ed90fb0SVlad Yasevich local_bh_disable(); 3373559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3374dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3375f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3376dc022a98SSridhar Samudrala } 33770ed90fb0SVlad Yasevich local_bh_enable(); 33783cd9749cSWei Yongjun list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33793cd9749cSWei Yongjun transports) { 3380c86a773cSJulian Anastasov sctp_transport_dst_release(transport); 33813cd9749cSWei Yongjun } 33821da177e4SLinus Torvalds break; 33831da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 33840ed90fb0SVlad Yasevich local_bh_disable(); 3385425e0f68SWei Yongjun sctp_del_bind_addr(bp, &addr); 33868a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending != NULL && 33878a07eb0aSMichio Honda sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { 33888a07eb0aSMichio Honda kfree(asoc->asconf_addr_del_pending); 33898a07eb0aSMichio Honda asoc->asconf_addr_del_pending = NULL; 33908a07eb0aSMichio Honda } 33910ed90fb0SVlad Yasevich local_bh_enable(); 33929dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33939dbc15f0SRobert P. J. Day transports) { 3394c86a773cSJulian Anastasov sctp_transport_dst_release(transport); 33951da177e4SLinus Torvalds } 33961da177e4SLinus Torvalds break; 33971da177e4SLinus Torvalds default: 33981da177e4SLinus Torvalds break; 33991da177e4SLinus Torvalds } 34001da177e4SLinus Torvalds } 34011da177e4SLinus Torvalds 34021da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 34031da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 34041da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 34051da177e4SLinus Torvalds * ADDIP 4.1 34061da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 34071da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 34081da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 34091da177e4SLinus Torvalds * specific success indication is present for the parameter. 34101da177e4SLinus Torvalds */ 3411dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 34128b32f234SXin Long struct sctp_addip_param *asconf_param, 34131da177e4SLinus Torvalds int no_err) 34141da177e4SLinus Torvalds { 34158b32f234SXin Long struct sctp_addip_param *asconf_ack_param; 3416d8238d9dSXin Long struct sctp_errhdr *err_param; 3417f3830cccSWei Yongjun int asconf_ack_len; 3418dbc16db1SAl Viro __be16 err_code; 3419327c0dabSXin Long int length; 34201da177e4SLinus Torvalds 34211da177e4SLinus Torvalds if (no_err) 34221da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 34231da177e4SLinus Torvalds else 34241da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 34251da177e4SLinus Torvalds 3426f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3427922dbc5bSXin Long sizeof(struct sctp_chunkhdr); 3428f3830cccSWei Yongjun 34291da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 34301da177e4SLinus Torvalds * the first asconf_ack parameter. 34311da177e4SLinus Torvalds */ 343265205cc4SXin Long length = sizeof(struct sctp_addiphdr); 34338b32f234SXin Long asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data + 34341da177e4SLinus Torvalds length); 34351da177e4SLinus Torvalds asconf_ack_len -= length; 34361da177e4SLinus Torvalds 34371da177e4SLinus Torvalds while (asconf_ack_len > 0) { 34381da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 34391da177e4SLinus Torvalds switch (asconf_ack_param->param_hdr.type) { 34401da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 34411da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 34421da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 34438b32f234SXin Long length = sizeof(*asconf_ack_param); 3444ea110733SJoe Perches err_param = (void *)asconf_ack_param + length; 34451da177e4SLinus Torvalds asconf_ack_len -= length; 34461da177e4SLinus Torvalds if (asconf_ack_len > 0) 34471da177e4SLinus Torvalds return err_param->cause; 34481da177e4SLinus Torvalds else 34491da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 34501da177e4SLinus Torvalds break; 34511da177e4SLinus Torvalds default: 34521da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 34531da177e4SLinus Torvalds } 34541da177e4SLinus Torvalds } 34551da177e4SLinus Torvalds 34561da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 3457ea110733SJoe Perches asconf_ack_param = (void *)asconf_ack_param + length; 34581da177e4SLinus Torvalds asconf_ack_len -= length; 34591da177e4SLinus Torvalds } 34601da177e4SLinus Torvalds 34611da177e4SLinus Torvalds return err_code; 34621da177e4SLinus Torvalds } 34631da177e4SLinus Torvalds 34641da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 34651da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 34661da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 34671da177e4SLinus Torvalds { 34681da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 34698b32f234SXin Long struct sctp_addip_param *asconf_param; 3470327c0dabSXin Long __be16 err_code = SCTP_ERROR_NO_ERROR; 3471327c0dabSXin Long union sctp_addr_param *addr_param; 34721da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 34731da177e4SLinus Torvalds int all_param_pass = 0; 3474327c0dabSXin Long int length = 0; 34751da177e4SLinus Torvalds int no_err = 1; 34761da177e4SLinus Torvalds int retval = 0; 34771da177e4SLinus Torvalds 34781da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 34791da177e4SLinus Torvalds * a pointer to address parameter. 34801da177e4SLinus Torvalds */ 348168d75469SXin Long length = sizeof(struct sctp_addip_chunk); 34821da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 34831da177e4SLinus Torvalds asconf_len -= length; 34841da177e4SLinus Torvalds 34851da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 34867aa1b54bSJoe Perches * pointer to the first asconf parameter. 34871da177e4SLinus Torvalds */ 34886a435732SShan Wei length = ntohs(addr_param->p.length); 3489ea110733SJoe Perches asconf_param = (void *)addr_param + length; 34901da177e4SLinus Torvalds asconf_len -= length; 34911da177e4SLinus Torvalds 34921da177e4SLinus Torvalds /* ADDIP 4.1 34931da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 34941da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 34951da177e4SLinus Torvalds * successful. 34961da177e4SLinus Torvalds */ 349765205cc4SXin Long if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr)) 34981da177e4SLinus Torvalds all_param_pass = 1; 34991da177e4SLinus Torvalds 35001da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 35011da177e4SLinus Torvalds while (asconf_len > 0) { 35021da177e4SLinus Torvalds if (all_param_pass) 35031da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 35041da177e4SLinus Torvalds else { 35051da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 35061da177e4SLinus Torvalds asconf_param, 35071da177e4SLinus Torvalds no_err); 35081da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 35091da177e4SLinus Torvalds no_err = 0; 35101da177e4SLinus Torvalds } 35111da177e4SLinus Torvalds 35121da177e4SLinus Torvalds switch (err_code) { 35131da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 3514425e0f68SWei Yongjun sctp_asconf_param_success(asoc, asconf_param); 35151da177e4SLinus Torvalds break; 35161da177e4SLinus Torvalds 35171da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 35181da177e4SLinus Torvalds retval = 1; 35191da177e4SLinus Torvalds break; 35201da177e4SLinus Torvalds 3521a987f762SWei Yongjun case SCTP_ERROR_UNKNOWN_PARAM: 35221da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 35231da177e4SLinus Torvalds * future. 35241da177e4SLinus Torvalds */ 35251da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 35261da177e4SLinus Torvalds asconf_param->param_hdr.type; 35271da177e4SLinus Torvalds break; 35281da177e4SLinus Torvalds 35291da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 35301da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 35311da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 35321da177e4SLinus Torvalds default: 35331da177e4SLinus Torvalds break; 35341da177e4SLinus Torvalds } 35351da177e4SLinus Torvalds 35361da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 35371da177e4SLinus Torvalds * one. 35381da177e4SLinus Torvalds */ 35391da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3540ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 35411da177e4SLinus Torvalds asconf_len -= length; 35421da177e4SLinus Torvalds } 35431da177e4SLinus Torvalds 3544ddc4bbeeSMichio Honda if (no_err && asoc->src_out_of_asoc_ok) { 35458a07eb0aSMichio Honda asoc->src_out_of_asoc_ok = 0; 3546ddc4bbeeSMichio Honda sctp_transport_immediate_rtx(asoc->peer.primary_path); 3547ddc4bbeeSMichio Honda } 35488a07eb0aSMichio Honda 35491da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 35505f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 35511da177e4SLinus Torvalds sctp_chunk_free(asconf); 35521da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 35531da177e4SLinus Torvalds 35541da177e4SLinus Torvalds return retval; 35551da177e4SLinus Torvalds } 35561da177e4SLinus Torvalds 35571da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 35581da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 35591da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 35601da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 35611da177e4SLinus Torvalds { 35621da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 35631da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 35641da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 35651da177e4SLinus Torvalds size_t hint; 35661da177e4SLinus Torvalds int i; 35671da177e4SLinus Torvalds 35681da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 35691da177e4SLinus Torvalds 3570cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC); 35711da177e4SLinus Torvalds 35721da177e4SLinus Torvalds if (!retval) 35731da177e4SLinus Torvalds return NULL; 35741da177e4SLinus Torvalds 35751da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 35761da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 35771da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 35781da177e4SLinus Torvalds 35791da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 35801da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 35811da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 35821da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 35831da177e4SLinus Torvalds } 35841da177e4SLinus Torvalds 35851da177e4SLinus Torvalds return retval; 35861da177e4SLinus Torvalds } 3587cc16f00fSXin Long 35882d07a49aSXin Long struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc, 35892d07a49aSXin Long __u32 new_cum_tsn, size_t nstreams, 35902d07a49aSXin Long struct sctp_ifwdtsn_skip *skiplist) 35912d07a49aSXin Long { 35922d07a49aSXin Long struct sctp_chunk *retval = NULL; 35932d07a49aSXin Long struct sctp_ifwdtsn_hdr ftsn_hdr; 35942d07a49aSXin Long size_t hint; 35952d07a49aSXin Long 35962d07a49aSXin Long hint = (nstreams + 1) * sizeof(__u32); 35972d07a49aSXin Long 35982d07a49aSXin Long retval = sctp_make_control(asoc, SCTP_CID_I_FWD_TSN, 0, hint, 35992d07a49aSXin Long GFP_ATOMIC); 36002d07a49aSXin Long if (!retval) 36012d07a49aSXin Long return NULL; 36022d07a49aSXin Long 36032d07a49aSXin Long ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 36042d07a49aSXin Long retval->subh.ifwdtsn_hdr = 36052d07a49aSXin Long sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 36062d07a49aSXin Long 36072d07a49aSXin Long sctp_addto_chunk(retval, nstreams * sizeof(skiplist[0]), skiplist); 36082d07a49aSXin Long 36092d07a49aSXin Long return retval; 36102d07a49aSXin Long } 36112d07a49aSXin Long 3612cc16f00fSXin Long /* RE-CONFIG 3.1 (RE-CONFIG chunk) 3613cc16f00fSXin Long * 0 1 2 3 3614cc16f00fSXin 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 3615cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3616cc16f00fSXin Long * | Type = 130 | Chunk Flags | Chunk Length | 3617cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3618cc16f00fSXin Long * \ \ 3619cc16f00fSXin Long * / Re-configuration Parameter / 3620cc16f00fSXin Long * \ \ 3621cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3622cc16f00fSXin Long * \ \ 3623cc16f00fSXin Long * / Re-configuration Parameter (optional) / 3624cc16f00fSXin Long * \ \ 3625cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3626cc16f00fSXin Long */ 3627327c0dabSXin Long static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc, 3628cc16f00fSXin Long int length) 3629cc16f00fSXin Long { 3630cc16f00fSXin Long struct sctp_reconf_chunk *reconf; 3631cc16f00fSXin Long struct sctp_chunk *retval; 3632cc16f00fSXin Long 3633cc16f00fSXin Long retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length, 3634cc16f00fSXin Long GFP_ATOMIC); 3635cc16f00fSXin Long if (!retval) 3636cc16f00fSXin Long return NULL; 3637cc16f00fSXin Long 3638cc16f00fSXin Long reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr; 3639*add7370aSXin Long retval->param_hdr.v = (u8 *)(reconf + 1); 3640cc16f00fSXin Long 3641cc16f00fSXin Long return retval; 3642cc16f00fSXin Long } 3643cc16f00fSXin Long 3644cc16f00fSXin Long /* RE-CONFIG 4.1 (STREAM OUT RESET) 3645cc16f00fSXin Long * 0 1 2 3 3646cc16f00fSXin 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 3647cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3648cc16f00fSXin Long * | Parameter Type = 13 | Parameter Length = 16 + 2 * N | 3649cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3650cc16f00fSXin Long * | Re-configuration Request Sequence Number | 3651cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3652cc16f00fSXin Long * | Re-configuration Response Sequence Number | 3653cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3654cc16f00fSXin Long * | Sender's Last Assigned TSN | 3655cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3656cc16f00fSXin Long * | Stream Number 1 (optional) | Stream Number 2 (optional) | 3657cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3658cc16f00fSXin Long * / ...... / 3659cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3660cc16f00fSXin Long * | Stream Number N-1 (optional) | Stream Number N (optional) | 3661cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3662cc16f00fSXin Long * 3663cc16f00fSXin Long * RE-CONFIG 4.2 (STREAM IN RESET) 3664cc16f00fSXin Long * 0 1 2 3 3665cc16f00fSXin 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 3666cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3667cc16f00fSXin Long * | Parameter Type = 14 | Parameter Length = 8 + 2 * N | 3668cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3669cc16f00fSXin Long * | Re-configuration Request Sequence Number | 3670cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3671cc16f00fSXin Long * | Stream Number 1 (optional) | Stream Number 2 (optional) | 3672cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3673cc16f00fSXin Long * / ...... / 3674cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3675cc16f00fSXin Long * | Stream Number N-1 (optional) | Stream Number N (optional) | 3676cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3677cc16f00fSXin Long */ 3678cc16f00fSXin Long struct sctp_chunk *sctp_make_strreset_req( 3679cc16f00fSXin Long const struct sctp_association *asoc, 36801da4fc97SXin Long __u16 stream_num, __be16 *stream_list, 3681cc16f00fSXin Long bool out, bool in) 3682cc16f00fSXin Long { 3683423852f8SXin Long __u16 stream_len = stream_num * sizeof(__u16); 3684cc16f00fSXin Long struct sctp_strreset_outreq outreq; 3685cc16f00fSXin Long struct sctp_strreset_inreq inreq; 3686cc16f00fSXin Long struct sctp_chunk *retval; 368716e1a919SXin Long __u16 outlen, inlen; 3688cc16f00fSXin Long 3689cc16f00fSXin Long outlen = (sizeof(outreq) + stream_len) * out; 3690cc16f00fSXin Long inlen = (sizeof(inreq) + stream_len) * in; 3691cc16f00fSXin Long 3692a2d859e3SEiichi Tsukata retval = sctp_make_reconf(asoc, SCTP_PAD4(outlen) + SCTP_PAD4(inlen)); 3693cc16f00fSXin Long if (!retval) 3694cc16f00fSXin Long return NULL; 3695cc16f00fSXin Long 3696cc16f00fSXin Long if (outlen) { 3697cc16f00fSXin Long outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST; 3698cc16f00fSXin Long outreq.param_hdr.length = htons(outlen); 3699cc16f00fSXin Long outreq.request_seq = htonl(asoc->strreset_outseq); 3700cc16f00fSXin Long outreq.response_seq = htonl(asoc->strreset_inseq - 1); 3701cc16f00fSXin Long outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1); 3702cc16f00fSXin Long 3703cc16f00fSXin Long sctp_addto_chunk(retval, sizeof(outreq), &outreq); 3704cc16f00fSXin Long 3705cc16f00fSXin Long if (stream_len) 3706cc16f00fSXin Long sctp_addto_chunk(retval, stream_len, stream_list); 3707cc16f00fSXin Long } 3708cc16f00fSXin Long 3709cc16f00fSXin Long if (inlen) { 3710cc16f00fSXin Long inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST; 3711cc16f00fSXin Long inreq.param_hdr.length = htons(inlen); 3712cc16f00fSXin Long inreq.request_seq = htonl(asoc->strreset_outseq + out); 3713cc16f00fSXin Long 3714cc16f00fSXin Long sctp_addto_chunk(retval, sizeof(inreq), &inreq); 3715cc16f00fSXin Long 3716cc16f00fSXin Long if (stream_len) 3717cc16f00fSXin Long sctp_addto_chunk(retval, stream_len, stream_list); 3718cc16f00fSXin Long } 3719cc16f00fSXin Long 3720cc16f00fSXin Long return retval; 3721cc16f00fSXin Long } 3722c56480a1SXin Long 3723c56480a1SXin Long /* RE-CONFIG 4.3 (SSN/TSN RESET ALL) 3724c56480a1SXin Long * 0 1 2 3 3725c56480a1SXin 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 3726c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3727c56480a1SXin Long * | Parameter Type = 15 | Parameter Length = 8 | 3728c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3729c56480a1SXin Long * | Re-configuration Request Sequence Number | 3730c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3731c56480a1SXin Long */ 3732c56480a1SXin Long struct sctp_chunk *sctp_make_strreset_tsnreq( 3733c56480a1SXin Long const struct sctp_association *asoc) 3734c56480a1SXin Long { 3735c56480a1SXin Long struct sctp_strreset_tsnreq tsnreq; 3736c56480a1SXin Long __u16 length = sizeof(tsnreq); 3737c56480a1SXin Long struct sctp_chunk *retval; 3738c56480a1SXin Long 3739c56480a1SXin Long retval = sctp_make_reconf(asoc, length); 3740c56480a1SXin Long if (!retval) 3741c56480a1SXin Long return NULL; 3742c56480a1SXin Long 3743c56480a1SXin Long tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST; 3744c56480a1SXin Long tsnreq.param_hdr.length = htons(length); 3745c56480a1SXin Long tsnreq.request_seq = htonl(asoc->strreset_outseq); 3746c56480a1SXin Long 3747c56480a1SXin Long sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq); 3748c56480a1SXin Long 3749c56480a1SXin Long return retval; 3750c56480a1SXin Long } 375178098117SXin Long 375278098117SXin Long /* RE-CONFIG 4.5/4.6 (ADD STREAM) 375378098117SXin Long * 0 1 2 3 375478098117SXin 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 375578098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 375678098117SXin Long * | Parameter Type = 17 | Parameter Length = 12 | 375778098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 375878098117SXin Long * | Re-configuration Request Sequence Number | 375978098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 376078098117SXin Long * | Number of new streams | Reserved | 376178098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 376278098117SXin Long */ 376378098117SXin Long struct sctp_chunk *sctp_make_strreset_addstrm( 376478098117SXin Long const struct sctp_association *asoc, 376578098117SXin Long __u16 out, __u16 in) 376678098117SXin Long { 376778098117SXin Long struct sctp_strreset_addstrm addstrm; 376878098117SXin Long __u16 size = sizeof(addstrm); 376978098117SXin Long struct sctp_chunk *retval; 377078098117SXin Long 377178098117SXin Long retval = sctp_make_reconf(asoc, (!!out + !!in) * size); 377278098117SXin Long if (!retval) 377378098117SXin Long return NULL; 377478098117SXin Long 377578098117SXin Long if (out) { 377678098117SXin Long addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS; 377778098117SXin Long addstrm.param_hdr.length = htons(size); 377878098117SXin Long addstrm.number_of_streams = htons(out); 377978098117SXin Long addstrm.request_seq = htonl(asoc->strreset_outseq); 378078098117SXin Long addstrm.reserved = 0; 378178098117SXin Long 378278098117SXin Long sctp_addto_chunk(retval, size, &addstrm); 378378098117SXin Long } 378478098117SXin Long 378578098117SXin Long if (in) { 378678098117SXin Long addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS; 378778098117SXin Long addstrm.param_hdr.length = htons(size); 378878098117SXin Long addstrm.number_of_streams = htons(in); 378978098117SXin Long addstrm.request_seq = htonl(asoc->strreset_outseq + !!out); 379078098117SXin Long addstrm.reserved = 0; 379178098117SXin Long 379278098117SXin Long sctp_addto_chunk(retval, size, &addstrm); 379378098117SXin Long } 379478098117SXin Long 379578098117SXin Long return retval; 379678098117SXin Long } 3797bd4b9f8bSXin Long 3798bd4b9f8bSXin Long /* RE-CONFIG 4.4 (RESP) 3799bd4b9f8bSXin Long * 0 1 2 3 3800bd4b9f8bSXin 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 3801bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3802bd4b9f8bSXin Long * | Parameter Type = 16 | Parameter Length | 3803bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3804bd4b9f8bSXin Long * | Re-configuration Response Sequence Number | 3805bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3806bd4b9f8bSXin Long * | Result | 3807bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3808bd4b9f8bSXin Long */ 3809327c0dabSXin Long struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc, 3810bd4b9f8bSXin Long __u32 result, __u32 sn) 3811bd4b9f8bSXin Long { 3812bd4b9f8bSXin Long struct sctp_strreset_resp resp; 3813bd4b9f8bSXin Long __u16 length = sizeof(resp); 3814bd4b9f8bSXin Long struct sctp_chunk *retval; 3815bd4b9f8bSXin Long 3816bd4b9f8bSXin Long retval = sctp_make_reconf(asoc, length); 3817bd4b9f8bSXin Long if (!retval) 3818bd4b9f8bSXin Long return NULL; 3819bd4b9f8bSXin Long 3820bd4b9f8bSXin Long resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; 3821bd4b9f8bSXin Long resp.param_hdr.length = htons(length); 3822bd4b9f8bSXin Long resp.response_seq = htonl(sn); 3823bd4b9f8bSXin Long resp.result = htonl(result); 3824bd4b9f8bSXin Long 3825bd4b9f8bSXin Long sctp_addto_chunk(retval, sizeof(resp), &resp); 3826bd4b9f8bSXin Long 3827bd4b9f8bSXin Long return retval; 3828bd4b9f8bSXin Long } 3829bd4b9f8bSXin Long 3830bd4b9f8bSXin Long /* RE-CONFIG 4.4 OPTIONAL (TSNRESP) 3831bd4b9f8bSXin Long * 0 1 2 3 3832bd4b9f8bSXin 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 3833bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3834bd4b9f8bSXin Long * | Parameter Type = 16 | Parameter Length | 3835bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3836bd4b9f8bSXin Long * | Re-configuration Response Sequence Number | 3837bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3838bd4b9f8bSXin Long * | Result | 3839bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3840bd4b9f8bSXin Long * | Sender's Next TSN (optional) | 3841bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3842bd4b9f8bSXin Long * | Receiver's Next TSN (optional) | 3843bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3844bd4b9f8bSXin Long */ 3845327c0dabSXin Long struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc, 3846bd4b9f8bSXin Long __u32 result, __u32 sn, 3847327c0dabSXin Long __u32 sender_tsn, 3848327c0dabSXin Long __u32 receiver_tsn) 3849bd4b9f8bSXin Long { 3850bd4b9f8bSXin Long struct sctp_strreset_resptsn tsnresp; 3851bd4b9f8bSXin Long __u16 length = sizeof(tsnresp); 3852bd4b9f8bSXin Long struct sctp_chunk *retval; 3853bd4b9f8bSXin Long 3854bd4b9f8bSXin Long retval = sctp_make_reconf(asoc, length); 3855bd4b9f8bSXin Long if (!retval) 3856bd4b9f8bSXin Long return NULL; 3857bd4b9f8bSXin Long 3858bd4b9f8bSXin Long tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; 3859bd4b9f8bSXin Long tsnresp.param_hdr.length = htons(length); 3860bd4b9f8bSXin Long 3861bd4b9f8bSXin Long tsnresp.response_seq = htonl(sn); 3862bd4b9f8bSXin Long tsnresp.result = htonl(result); 3863bd4b9f8bSXin Long tsnresp.senders_next_tsn = htonl(sender_tsn); 3864bd4b9f8bSXin Long tsnresp.receivers_next_tsn = htonl(receiver_tsn); 3865bd4b9f8bSXin Long 3866bd4b9f8bSXin Long sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp); 3867bd4b9f8bSXin Long 3868bd4b9f8bSXin Long return retval; 3869bd4b9f8bSXin Long } 3870ea625043SXin Long 3871ea625043SXin Long bool sctp_verify_reconf(const struct sctp_association *asoc, 3872ea625043SXin Long struct sctp_chunk *chunk, 3873ea625043SXin Long struct sctp_paramhdr **errp) 3874ea625043SXin Long { 3875ea625043SXin Long struct sctp_reconf_chunk *hdr; 3876ea625043SXin Long union sctp_params param; 38771da4fc97SXin Long __be16 last = 0; 38781da4fc97SXin Long __u16 cnt = 0; 3879ea625043SXin Long 3880ea625043SXin Long hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; 3881*add7370aSXin Long sctp_walk_params(param, hdr) { 3882ea625043SXin Long __u16 length = ntohs(param.p->length); 3883ea625043SXin Long 3884ea625043SXin Long *errp = param.p; 3885ea625043SXin Long if (cnt++ > 2) 3886ea625043SXin Long return false; 3887ea625043SXin Long switch (param.p->type) { 3888ea625043SXin Long case SCTP_PARAM_RESET_OUT_REQUEST: 3889ea625043SXin Long if (length < sizeof(struct sctp_strreset_outreq) || 3890ea625043SXin Long (last && last != SCTP_PARAM_RESET_RESPONSE && 3891ea625043SXin Long last != SCTP_PARAM_RESET_IN_REQUEST)) 3892ea625043SXin Long return false; 3893ea625043SXin Long break; 3894ea625043SXin Long case SCTP_PARAM_RESET_IN_REQUEST: 3895ea625043SXin Long if (length < sizeof(struct sctp_strreset_inreq) || 3896ea625043SXin Long (last && last != SCTP_PARAM_RESET_OUT_REQUEST)) 3897ea625043SXin Long return false; 3898ea625043SXin Long break; 3899ea625043SXin Long case SCTP_PARAM_RESET_RESPONSE: 3900ea625043SXin Long if ((length != sizeof(struct sctp_strreset_resp) && 3901ea625043SXin Long length != sizeof(struct sctp_strreset_resptsn)) || 3902ea625043SXin Long (last && last != SCTP_PARAM_RESET_RESPONSE && 3903ea625043SXin Long last != SCTP_PARAM_RESET_OUT_REQUEST)) 3904ea625043SXin Long return false; 3905ea625043SXin Long break; 3906ea625043SXin Long case SCTP_PARAM_RESET_TSN_REQUEST: 3907ea625043SXin Long if (length != 3908ea625043SXin Long sizeof(struct sctp_strreset_tsnreq) || last) 3909ea625043SXin Long return false; 3910ea625043SXin Long break; 3911ea625043SXin Long case SCTP_PARAM_RESET_ADD_IN_STREAMS: 3912ea625043SXin Long if (length != sizeof(struct sctp_strreset_addstrm) || 3913ea625043SXin Long (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS)) 3914ea625043SXin Long return false; 3915ea625043SXin Long break; 3916ea625043SXin Long case SCTP_PARAM_RESET_ADD_OUT_STREAMS: 3917ea625043SXin Long if (length != sizeof(struct sctp_strreset_addstrm) || 3918ea625043SXin Long (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS)) 3919ea625043SXin Long return false; 3920ea625043SXin Long break; 3921ea625043SXin Long default: 3922ea625043SXin Long return false; 3923ea625043SXin Long } 3924ea625043SXin Long 3925ea625043SXin Long last = param.p->type; 3926ea625043SXin Long } 3927ea625043SXin Long 3928ea625043SXin Long return true; 3929ea625043SXin Long } 3930