160c778b2SVlad Yasevich /* SCTP kernel implementation 21da177e4SLinus Torvalds * (C) Copyright IBM Corp. 2001, 2004 31da177e4SLinus Torvalds * Copyright (c) 1999-2000 Cisco, Inc. 41da177e4SLinus Torvalds * Copyright (c) 1999-2001 Motorola, Inc. 51da177e4SLinus Torvalds * Copyright (c) 2001-2002 Intel Corp. 61da177e4SLinus Torvalds * 760c778b2SVlad Yasevich * This file is part of the SCTP kernel implementation 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * These functions work with the state functions in sctp_sm_statefuns.c 101da177e4SLinus Torvalds * to implement the state operations. These functions implement the 111da177e4SLinus Torvalds * steps which require modifying existing data structures. 121da177e4SLinus Torvalds * 1360c778b2SVlad Yasevich * This SCTP implementation is free software; 141da177e4SLinus Torvalds * you can redistribute it and/or modify it under the terms of 151da177e4SLinus Torvalds * the GNU General Public License as published by 161da177e4SLinus Torvalds * the Free Software Foundation; either version 2, or (at your option) 171da177e4SLinus Torvalds * any later version. 181da177e4SLinus Torvalds * 1960c778b2SVlad Yasevich * This SCTP implementation is distributed in the hope that it 201da177e4SLinus Torvalds * will be useful, but WITHOUT ANY WARRANTY; without even the implied 211da177e4SLinus Torvalds * ************************ 221da177e4SLinus Torvalds * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 231da177e4SLinus Torvalds * See the GNU General Public License for more details. 241da177e4SLinus Torvalds * 251da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 264b2f13a2SJeff Kirsher * along with GNU CC; see the file COPYING. If not, see 274b2f13a2SJeff Kirsher * <http://www.gnu.org/licenses/>. 281da177e4SLinus Torvalds * 291da177e4SLinus Torvalds * Please send any bug reports or fixes you make to the 301da177e4SLinus Torvalds * email address(es): 3191705c61SDaniel Borkmann * lksctp developers <linux-sctp@vger.kernel.org> 321da177e4SLinus Torvalds * 331da177e4SLinus Torvalds * Written or modified by: 341da177e4SLinus Torvalds * La Monte H.P. Yarroll <piggy@acm.org> 351da177e4SLinus Torvalds * Karl Knutson <karl@athena.chicago.il.us> 361da177e4SLinus Torvalds * C. Robin <chris@hundredacre.ac.uk> 371da177e4SLinus Torvalds * Jon Grimm <jgrimm@us.ibm.com> 381da177e4SLinus Torvalds * Xingang Guo <xingang.guo@intel.com> 391da177e4SLinus Torvalds * Dajiang Zhang <dajiang.zhang@nokia.com> 401da177e4SLinus Torvalds * Sridhar Samudrala <sri@us.ibm.com> 411da177e4SLinus Torvalds * Daisy Chang <daisyc@us.ibm.com> 421da177e4SLinus Torvalds * Ardelle Fan <ardelle.fan@intel.com> 431da177e4SLinus Torvalds * Kevin Gao <kevin.gao@intel.com> 441da177e4SLinus Torvalds */ 451da177e4SLinus Torvalds 46145ce502SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 47145ce502SJoe Perches 481da177e4SLinus Torvalds #include <linux/types.h> 491da177e4SLinus Torvalds #include <linux/kernel.h> 501da177e4SLinus Torvalds #include <linux/ip.h> 511da177e4SLinus Torvalds #include <linux/ipv6.h> 521da177e4SLinus Torvalds #include <linux/net.h> 531da177e4SLinus Torvalds #include <linux/inet.h> 54ebc3bbcfSChristian Borntraeger #include <linux/scatterlist.h> 551da177e4SLinus Torvalds #include <linux/crypto.h> 565a0e3ad6STejun Heo #include <linux/slab.h> 571da177e4SLinus Torvalds #include <net/sock.h> 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds #include <linux/skbuff.h> 601da177e4SLinus Torvalds #include <linux/random.h> /* for get_random_bytes */ 611da177e4SLinus Torvalds #include <net/sctp/sctp.h> 621da177e4SLinus Torvalds #include <net/sctp/sm.h> 631da177e4SLinus Torvalds 64072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 65072017b4SVlad Yasevich __u8 type, __u8 flags, int paylen); 66072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 67072017b4SVlad Yasevich __u8 flags, int paylen); 68072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 691da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen); 701da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 711da177e4SLinus Torvalds const struct sctp_association *asoc, 721da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 731da177e4SLinus Torvalds int *cookie_len, 741da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len); 751da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 761da177e4SLinus Torvalds union sctp_params param, 771da177e4SLinus Torvalds const union sctp_addr *peer_addr, 78dd0fc66fSAl Viro gfp_t gfp); 798ee4be37SVlad Yasevich static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 808ee4be37SVlad Yasevich const void *data); 816daaf0deSstephen hemminger static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len, 826daaf0deSstephen hemminger const void *data); 831da177e4SLinus Torvalds 84072017b4SVlad Yasevich /* Control chunk destructor */ 85072017b4SVlad Yasevich static void sctp_control_release_owner(struct sk_buff *skb) 86072017b4SVlad Yasevich { 87072017b4SVlad Yasevich /*TODO: do memory release */ 88072017b4SVlad Yasevich } 89072017b4SVlad Yasevich 90072017b4SVlad Yasevich static void sctp_control_set_owner_w(struct sctp_chunk *chunk) 91072017b4SVlad Yasevich { 92072017b4SVlad Yasevich struct sctp_association *asoc = chunk->asoc; 93072017b4SVlad Yasevich struct sk_buff *skb = chunk->skb; 94072017b4SVlad Yasevich 95072017b4SVlad Yasevich /* TODO: properly account for control chunks. 96072017b4SVlad Yasevich * To do it right we'll need: 97072017b4SVlad Yasevich * 1) endpoint if association isn't known. 98072017b4SVlad Yasevich * 2) proper memory accounting. 99072017b4SVlad Yasevich * 100072017b4SVlad Yasevich * For now don't do anything for now. 101072017b4SVlad Yasevich */ 102072017b4SVlad Yasevich skb->sk = asoc ? asoc->base.sk : NULL; 103072017b4SVlad Yasevich skb->destructor = sctp_control_release_owner; 104072017b4SVlad Yasevich } 105072017b4SVlad Yasevich 1061da177e4SLinus Torvalds /* What was the inbound interface for this chunk? */ 1071da177e4SLinus Torvalds int sctp_chunk_iif(const struct sctp_chunk *chunk) 1081da177e4SLinus Torvalds { 1091da177e4SLinus Torvalds struct sctp_af *af; 1101da177e4SLinus Torvalds int iif = 0; 1111da177e4SLinus Torvalds 112eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version)); 1131da177e4SLinus Torvalds if (af) 1141da177e4SLinus Torvalds iif = af->skb_iif(chunk->skb); 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds return iif; 1171da177e4SLinus Torvalds } 1181da177e4SLinus Torvalds 1191da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 1201da177e4SLinus Torvalds * 1211da177e4SLinus Torvalds * Note 2: The ECN capable field is reserved for future use of 1221da177e4SLinus Torvalds * Explicit Congestion Notification. 1231da177e4SLinus Torvalds */ 1241da177e4SLinus Torvalds static const struct sctp_paramhdr ecap_param = { 1251da177e4SLinus Torvalds SCTP_PARAM_ECN_CAPABLE, 12609640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1271da177e4SLinus Torvalds }; 1281da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1291da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 13009640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1311da177e4SLinus Torvalds }; 1321da177e4SLinus Torvalds 1335fa782c2SNeil Horman /* A helper to initialize an op error inside a 1341da177e4SLinus Torvalds * provided chunk, as most cause codes will be embedded inside an 1351da177e4SLinus Torvalds * abort chunk. 1361da177e4SLinus Torvalds */ 1375bf2db03SAl Viro void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, 13800f1c2dfSWei Yongjun size_t paylen) 1391da177e4SLinus Torvalds { 1401da177e4SLinus Torvalds sctp_errhdr_t err; 1411da177e4SLinus Torvalds __u16 len; 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds /* Cause code constants are now defined in network order. */ 1441da177e4SLinus Torvalds err.cause = cause_code; 1451da177e4SLinus Torvalds len = sizeof(sctp_errhdr_t) + paylen; 1461da177e4SLinus Torvalds err.length = htons(len); 1474a1c0107SVlad Yasevich chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); 1481da177e4SLinus Torvalds } 1491da177e4SLinus Torvalds 1505fa782c2SNeil Horman /* A helper to initialize an op error inside a 1515fa782c2SNeil Horman * provided chunk, as most cause codes will be embedded inside an 1525fa782c2SNeil Horman * abort chunk. Differs from sctp_init_cause in that it won't oops 1535fa782c2SNeil Horman * if there isn't enough space in the op error chunk 1545fa782c2SNeil Horman */ 155db28aafaSIoan Orghici static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code, 1565fa782c2SNeil Horman size_t paylen) 1575fa782c2SNeil Horman { 1585fa782c2SNeil Horman sctp_errhdr_t err; 1595fa782c2SNeil Horman __u16 len; 1605fa782c2SNeil Horman 1615fa782c2SNeil Horman /* Cause code constants are now defined in network order. */ 1625fa782c2SNeil Horman err.cause = cause_code; 1635fa782c2SNeil Horman len = sizeof(sctp_errhdr_t) + paylen; 1645fa782c2SNeil Horman err.length = htons(len); 1655fa782c2SNeil Horman 1662e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) < len) 1675fa782c2SNeil Horman return -ENOSPC; 1685fa782c2SNeil Horman chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, 1695fa782c2SNeil Horman sizeof(sctp_errhdr_t), 1705fa782c2SNeil Horman &err); 1715fa782c2SNeil Horman return 0; 1725fa782c2SNeil Horman } 1731da177e4SLinus Torvalds /* 3.3.2 Initiation (INIT) (1) 1741da177e4SLinus Torvalds * 1751da177e4SLinus Torvalds * This chunk is used to initiate a SCTP association between two 1761da177e4SLinus Torvalds * endpoints. The format of the INIT chunk is shown below: 1771da177e4SLinus Torvalds * 1781da177e4SLinus Torvalds * 0 1 2 3 1791da177e4SLinus 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 1801da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1811da177e4SLinus Torvalds * | Type = 1 | Chunk Flags | Chunk Length | 1821da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1831da177e4SLinus Torvalds * | Initiate Tag | 1841da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1851da177e4SLinus Torvalds * | Advertised Receiver Window Credit (a_rwnd) | 1861da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1871da177e4SLinus Torvalds * | Number of Outbound Streams | Number of Inbound Streams | 1881da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1891da177e4SLinus Torvalds * | Initial TSN | 1901da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1911da177e4SLinus Torvalds * \ \ 1921da177e4SLinus Torvalds * / Optional/Variable-Length Parameters / 1931da177e4SLinus Torvalds * \ \ 1941da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1951da177e4SLinus Torvalds * 1961da177e4SLinus Torvalds * 1971da177e4SLinus Torvalds * The INIT chunk contains the following parameters. Unless otherwise 1981da177e4SLinus Torvalds * noted, each parameter MUST only be included once in the INIT chunk. 1991da177e4SLinus Torvalds * 2001da177e4SLinus Torvalds * Fixed Parameters Status 2011da177e4SLinus Torvalds * ---------------------------------------------- 2021da177e4SLinus Torvalds * Initiate Tag Mandatory 2031da177e4SLinus Torvalds * Advertised Receiver Window Credit Mandatory 2041da177e4SLinus Torvalds * Number of Outbound Streams Mandatory 2051da177e4SLinus Torvalds * Number of Inbound Streams Mandatory 2061da177e4SLinus Torvalds * Initial TSN Mandatory 2071da177e4SLinus Torvalds * 2081da177e4SLinus Torvalds * Variable Parameters Status Type Value 2091da177e4SLinus Torvalds * ------------------------------------------------------------- 2101da177e4SLinus Torvalds * IPv4 Address (Note 1) Optional 5 2111da177e4SLinus Torvalds * IPv6 Address (Note 1) Optional 6 2121da177e4SLinus Torvalds * Cookie Preservative Optional 9 2131da177e4SLinus Torvalds * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) 2141da177e4SLinus Torvalds * Host Name Address (Note 3) Optional 11 2151da177e4SLinus Torvalds * Supported Address Types (Note 4) Optional 12 2161da177e4SLinus Torvalds */ 2171da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, 2181da177e4SLinus Torvalds const struct sctp_bind_addr *bp, 219dd0fc66fSAl Viro gfp_t gfp, int vparam_len) 2201da177e4SLinus Torvalds { 221e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 222b14878ccSVlad Yasevich struct sctp_endpoint *ep = asoc->ep; 2231da177e4SLinus Torvalds sctp_inithdr_t init; 2241da177e4SLinus Torvalds union sctp_params addrs; 2251da177e4SLinus Torvalds size_t chunksize; 2261da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 2271da177e4SLinus Torvalds int num_types, addrs_len = 0; 2281da177e4SLinus Torvalds struct sctp_sock *sp; 2291da177e4SLinus Torvalds sctp_supported_addrs_param_t sat; 2303dbe8656SAl Viro __be16 types[2]; 2310f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 232131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 233131a47e3SVlad Yasevich int num_ext = 0; 234131a47e3SVlad Yasevich __u8 extensions[3]; 235730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 236730fc3d0SVlad Yasevich *auth_hmacs = NULL; 2371da177e4SLinus Torvalds 2381da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2391da177e4SLinus Torvalds * 2401da177e4SLinus Torvalds * Note 1: The INIT chunks can contain multiple addresses that 2411da177e4SLinus Torvalds * can be IPv4 and/or IPv6 in any combination. 2421da177e4SLinus Torvalds */ 2431da177e4SLinus Torvalds retval = NULL; 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds /* Convert the provided bind address list to raw format. */ 2461da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds init.init_tag = htonl(asoc->c.my_vtag); 2491da177e4SLinus Torvalds init.a_rwnd = htonl(asoc->rwnd); 2501da177e4SLinus Torvalds init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2511da177e4SLinus Torvalds init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2521da177e4SLinus Torvalds init.initial_tsn = htonl(asoc->c.initial_tsn); 2531da177e4SLinus Torvalds 2541da177e4SLinus Torvalds /* How many address types are needed? */ 2551da177e4SLinus Torvalds sp = sctp_sk(asoc->base.sk); 2561da177e4SLinus Torvalds num_types = sp->pf->supported_addrs(sp, types); 2571da177e4SLinus Torvalds 258a8170c35SWei Yongjun chunksize = sizeof(init) + addrs_len; 259a8170c35SWei Yongjun chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types)); 2601da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 2618ee4be37SVlad Yasevich 262e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable) 263036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 264036b579bSVlad Yasevich 265131a47e3SVlad Yasevich /* ADDIP: Section 4.2.7: 266131a47e3SVlad Yasevich * An implementation supporting this extension [ADDIP] MUST list 267131a47e3SVlad Yasevich * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and 268131a47e3SVlad Yasevich * INIT-ACK parameters. 269131a47e3SVlad Yasevich */ 270e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) { 271131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 272131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 273131a47e3SVlad Yasevich num_ext += 2; 274131a47e3SVlad Yasevich } 275131a47e3SVlad Yasevich 2766fc791eeSmalc if (sp->adaptation_ind) 2771da177e4SLinus Torvalds chunksize += sizeof(aiparam); 2786fc791eeSmalc 2791da177e4SLinus Torvalds chunksize += vparam_len; 2801da177e4SLinus Torvalds 281730fc3d0SVlad Yasevich /* Account for AUTH related parameters */ 282b14878ccSVlad Yasevich if (ep->auth_enable) { 283730fc3d0SVlad Yasevich /* Add random parameter length*/ 284730fc3d0SVlad Yasevich chunksize += sizeof(asoc->c.auth_random); 285730fc3d0SVlad Yasevich 286730fc3d0SVlad Yasevich /* Add HMACS parameter length if any were defined */ 287730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 288730fc3d0SVlad Yasevich if (auth_hmacs->length) 289a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); 290730fc3d0SVlad Yasevich else 291730fc3d0SVlad Yasevich auth_hmacs = NULL; 292730fc3d0SVlad Yasevich 293730fc3d0SVlad Yasevich /* Add CHUNKS parameter length */ 294730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 295730fc3d0SVlad Yasevich if (auth_chunks->length) 296a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_chunks->length)); 297730fc3d0SVlad Yasevich else 2989baffaa6SVlad Yasevich auth_chunks = NULL; 299730fc3d0SVlad Yasevich 300730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 301730fc3d0SVlad Yasevich num_ext += 1; 302730fc3d0SVlad Yasevich } 303730fc3d0SVlad Yasevich 304131a47e3SVlad Yasevich /* If we have any extensions to report, account for that */ 305131a47e3SVlad Yasevich if (num_ext) 306a8170c35SWei Yongjun chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + 307a8170c35SWei Yongjun num_ext); 308131a47e3SVlad Yasevich 3091da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3101da177e4SLinus Torvalds * 3111da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 3121da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 3131da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 3141da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 3151da177e4SLinus Torvalds * other address types if the Host Name address parameter is 3161da177e4SLinus Torvalds * present in the received INIT chunk. 3171da177e4SLinus Torvalds * 3181da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 3191da177e4SLinus Torvalds */ 3201da177e4SLinus Torvalds 321072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize); 3221da177e4SLinus Torvalds if (!retval) 3231da177e4SLinus Torvalds goto nodata; 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds retval->subh.init_hdr = 3261da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 3271da177e4SLinus Torvalds retval->param_hdr.v = 3281da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3311da177e4SLinus Torvalds * 3321da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 3331da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 3341da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 3351da177e4SLinus Torvalds * support any address type. 3361da177e4SLinus Torvalds */ 3371da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 3381da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 3391da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 3401da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 343131a47e3SVlad Yasevich 3447aa1b54bSJoe Perches /* Add the supported extensions parameter. Be nice and add this 345131a47e3SVlad Yasevich * fist before addiding the parameters for the extensions themselves 346131a47e3SVlad Yasevich */ 347131a47e3SVlad Yasevich if (num_ext) { 348131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 349131a47e3SVlad Yasevich ext_param.param_hdr.length = 350131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 351131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 352131a47e3SVlad Yasevich &ext_param); 3538ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 354131a47e3SVlad Yasevich } 355131a47e3SVlad Yasevich 356e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable) 3571da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 358131a47e3SVlad Yasevich 3596fc791eeSmalc if (sp->adaptation_ind) { 3600f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 3611da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3620f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sp->adaptation_ind); 3631da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 3646fc791eeSmalc } 365131a47e3SVlad Yasevich 366730fc3d0SVlad Yasevich /* Add SCTP-AUTH chunks to the parameter list */ 367b14878ccSVlad Yasevich if (ep->auth_enable) { 368730fc3d0SVlad Yasevich sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), 369730fc3d0SVlad Yasevich asoc->c.auth_random); 370730fc3d0SVlad Yasevich if (auth_hmacs) 371730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 372730fc3d0SVlad Yasevich auth_hmacs); 373730fc3d0SVlad Yasevich if (auth_chunks) 374730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 375730fc3d0SVlad Yasevich auth_chunks); 376730fc3d0SVlad Yasevich } 3771da177e4SLinus Torvalds nodata: 3781da177e4SLinus Torvalds kfree(addrs.v); 3791da177e4SLinus Torvalds return retval; 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 3831da177e4SLinus Torvalds const struct sctp_chunk *chunk, 384dd0fc66fSAl Viro gfp_t gfp, int unkparam_len) 3851da177e4SLinus Torvalds { 3861da177e4SLinus Torvalds sctp_inithdr_t initack; 3871da177e4SLinus Torvalds struct sctp_chunk *retval; 3881da177e4SLinus Torvalds union sctp_params addrs; 3896fc791eeSmalc struct sctp_sock *sp; 3901da177e4SLinus Torvalds int addrs_len; 3911da177e4SLinus Torvalds sctp_cookie_param_t *cookie; 3921da177e4SLinus Torvalds int cookie_len; 3931da177e4SLinus Torvalds size_t chunksize; 3940f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 395131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 396131a47e3SVlad Yasevich int num_ext = 0; 397131a47e3SVlad Yasevich __u8 extensions[3]; 398730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 399730fc3d0SVlad Yasevich *auth_hmacs = NULL, 400730fc3d0SVlad Yasevich *auth_random = NULL; 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds retval = NULL; 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 4051da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 4081da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 4091da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 4101da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 4111da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 4141da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 4151da177e4SLinus Torvalds */ 4161da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 4171da177e4SLinus Torvalds addrs.v, addrs_len); 4181da177e4SLinus Torvalds if (!cookie) 4191da177e4SLinus Torvalds goto nomem_cookie; 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 4221da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 4231da177e4SLinus Torvalds */ 4246fc791eeSmalc sp = sctp_sk(asoc->base.sk); 4251da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 4281da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4291da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 4301da177e4SLinus Torvalds 4315ffad5acSWei Yongjun if (asoc->peer.prsctp_capable) 432036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 433036b579bSVlad Yasevich 4345ffad5acSWei Yongjun if (asoc->peer.asconf_capable) { 435131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 436131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 437131a47e3SVlad Yasevich num_ext += 2; 438131a47e3SVlad Yasevich } 439131a47e3SVlad Yasevich 4406fc791eeSmalc if (sp->adaptation_ind) 4411da177e4SLinus Torvalds chunksize += sizeof(aiparam); 4421da177e4SLinus Torvalds 443730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 444730fc3d0SVlad Yasevich auth_random = (sctp_paramhdr_t *)asoc->c.auth_random; 445730fc3d0SVlad Yasevich chunksize += ntohs(auth_random->length); 446730fc3d0SVlad Yasevich 447730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 448730fc3d0SVlad Yasevich if (auth_hmacs->length) 449a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); 450730fc3d0SVlad Yasevich else 451730fc3d0SVlad Yasevich auth_hmacs = NULL; 452730fc3d0SVlad Yasevich 453730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 454730fc3d0SVlad Yasevich if (auth_chunks->length) 455a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_chunks->length)); 456730fc3d0SVlad Yasevich else 457730fc3d0SVlad Yasevich auth_chunks = NULL; 458730fc3d0SVlad Yasevich 459730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 460730fc3d0SVlad Yasevich num_ext += 1; 461730fc3d0SVlad Yasevich } 462730fc3d0SVlad Yasevich 4638ee4be37SVlad Yasevich if (num_ext) 464a8170c35SWei Yongjun chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + 465a8170c35SWei Yongjun num_ext); 4668ee4be37SVlad Yasevich 4671da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 468072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize); 4691da177e4SLinus Torvalds if (!retval) 4701da177e4SLinus Torvalds goto nomem_chunk; 4711da177e4SLinus Torvalds 472b99a4d53SDan Carpenter /* RFC 2960 6.4 Multi-homed SCTP Endpoints 473b99a4d53SDan Carpenter * 474b99a4d53SDan Carpenter * An endpoint SHOULD transmit reply chunks (e.g., SACK, 475b99a4d53SDan Carpenter * HEARTBEAT ACK, * etc.) to the same destination transport 476b99a4d53SDan Carpenter * address from which it received the DATA or control chunk 477b99a4d53SDan Carpenter * to which it is replying. 478b99a4d53SDan Carpenter * 479b99a4d53SDan Carpenter * [INIT ACK back to where the INIT came from.] 4801da177e4SLinus Torvalds */ 4811da177e4SLinus Torvalds retval->transport = chunk->transport; 482b99a4d53SDan Carpenter 4831da177e4SLinus Torvalds retval->subh.init_hdr = 4841da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 4851da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 4861da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 4871da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4881da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 489131a47e3SVlad Yasevich if (num_ext) { 490131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 491131a47e3SVlad Yasevich ext_param.param_hdr.length = 492131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 493131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 494131a47e3SVlad Yasevich &ext_param); 4958ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 496131a47e3SVlad Yasevich } 4971da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 4981da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 4991da177e4SLinus Torvalds 5006fc791eeSmalc if (sp->adaptation_ind) { 5010f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 5021da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 5036fc791eeSmalc aiparam.adaptation_ind = htonl(sp->adaptation_ind); 5041da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 5056fc791eeSmalc } 5061da177e4SLinus Torvalds 507730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 508730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_random->length), 509730fc3d0SVlad Yasevich auth_random); 510730fc3d0SVlad Yasevich if (auth_hmacs) 511730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 512730fc3d0SVlad Yasevich auth_hmacs); 513730fc3d0SVlad Yasevich if (auth_chunks) 514730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 515730fc3d0SVlad Yasevich auth_chunks); 516730fc3d0SVlad Yasevich } 517730fc3d0SVlad Yasevich 5181da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 5191da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds nomem_chunk: 5221da177e4SLinus Torvalds kfree(cookie); 5231da177e4SLinus Torvalds nomem_cookie: 5241da177e4SLinus Torvalds kfree(addrs.v); 5251da177e4SLinus Torvalds return retval; 5261da177e4SLinus Torvalds } 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 5291da177e4SLinus Torvalds * 5301da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 5311da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 5321da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 5331da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 5341da177e4SLinus Torvalds * chunks in the same packet. 5351da177e4SLinus Torvalds * 5361da177e4SLinus Torvalds * 0 1 2 3 5371da177e4SLinus 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 5381da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5391da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 5401da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5411da177e4SLinus Torvalds * / Cookie / 5421da177e4SLinus Torvalds * \ \ 5431da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5441da177e4SLinus Torvalds * 5451da177e4SLinus Torvalds * Chunk Flags: 8 bit 5461da177e4SLinus Torvalds * 5471da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5481da177e4SLinus Torvalds * 5491da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 5501da177e4SLinus Torvalds * 5511da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 5521da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 5531da177e4SLinus Torvalds * 5541da177e4SLinus Torvalds * Cookie: variable size 5551da177e4SLinus Torvalds * 5561da177e4SLinus Torvalds * This field must contain the exact cookie received in the 5571da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 5581da177e4SLinus Torvalds * 5591da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 5601da177e4SLinus Torvalds * to insure interoperability. 5611da177e4SLinus Torvalds */ 5621da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 5631da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5641da177e4SLinus Torvalds { 5651da177e4SLinus Torvalds struct sctp_chunk *retval; 5661da177e4SLinus Torvalds void *cookie; 5671da177e4SLinus Torvalds int cookie_len; 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds cookie = asoc->peer.cookie; 5701da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 5711da177e4SLinus Torvalds 5721da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 573072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len); 5741da177e4SLinus Torvalds if (!retval) 5751da177e4SLinus Torvalds goto nodata; 5761da177e4SLinus Torvalds retval->subh.cookie_hdr = 5771da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5801da177e4SLinus Torvalds * 5811da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5821da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5831da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5841da177e4SLinus Torvalds * to which it is replying. 5851da177e4SLinus Torvalds * 5861da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 5871da177e4SLinus Torvalds */ 5881da177e4SLinus Torvalds if (chunk) 5891da177e4SLinus Torvalds retval->transport = chunk->transport; 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds nodata: 5921da177e4SLinus Torvalds return retval; 5931da177e4SLinus Torvalds } 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 5961da177e4SLinus Torvalds * 5971da177e4SLinus Torvalds * This chunk is used only during the initialization of an 5981da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 5991da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 6001da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 6011da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 6021da177e4SLinus Torvalds * 6031da177e4SLinus Torvalds * 0 1 2 3 6041da177e4SLinus 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 6051da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6061da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 6071da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6081da177e4SLinus Torvalds * 6091da177e4SLinus Torvalds * Chunk Flags: 8 bits 6101da177e4SLinus Torvalds * 6111da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 6121da177e4SLinus Torvalds */ 6131da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 6141da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6151da177e4SLinus Torvalds { 6161da177e4SLinus Torvalds struct sctp_chunk *retval; 6171da177e4SLinus Torvalds 618072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0); 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6211da177e4SLinus Torvalds * 6221da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6231da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6241da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6251da177e4SLinus Torvalds * to which it is replying. 6261da177e4SLinus Torvalds * 6271da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 6281da177e4SLinus Torvalds */ 6291da177e4SLinus Torvalds if (retval && chunk) 6301da177e4SLinus Torvalds retval->transport = chunk->transport; 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds return retval; 6331da177e4SLinus Torvalds } 6341da177e4SLinus Torvalds 6351da177e4SLinus Torvalds /* 6361da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 6371da177e4SLinus Torvalds * CWR: 6381da177e4SLinus Torvalds * 6391da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 6401da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 6411da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 6421da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 6431da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 6441da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 6451da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 6461da177e4SLinus Torvalds * CE bit. 6471da177e4SLinus Torvalds * 6481da177e4SLinus Torvalds * 0 1 2 3 6491da177e4SLinus 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 6501da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6511da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 6521da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6531da177e4SLinus Torvalds * | Lowest TSN Number | 6541da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6551da177e4SLinus Torvalds * 6561da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 6571da177e4SLinus Torvalds */ 6581da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 6591da177e4SLinus Torvalds const __u32 lowest_tsn, 6601da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6611da177e4SLinus Torvalds { 6621da177e4SLinus Torvalds struct sctp_chunk *retval; 6631da177e4SLinus Torvalds sctp_cwrhdr_t cwr; 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 666072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, 6671da177e4SLinus Torvalds sizeof(sctp_cwrhdr_t)); 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds if (!retval) 6701da177e4SLinus Torvalds goto nodata; 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 6731da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6761da177e4SLinus Torvalds * 6771da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6781da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6791da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6801da177e4SLinus Torvalds * to which it is replying. 6811da177e4SLinus Torvalds * 6821da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 6831da177e4SLinus Torvalds * came from.] 6841da177e4SLinus Torvalds */ 6851da177e4SLinus Torvalds if (chunk) 6861da177e4SLinus Torvalds retval->transport = chunk->transport; 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds nodata: 6891da177e4SLinus Torvalds return retval; 6901da177e4SLinus Torvalds } 6911da177e4SLinus Torvalds 6921da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 6931da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 6941da177e4SLinus Torvalds const __u32 lowest_tsn) 6951da177e4SLinus Torvalds { 6961da177e4SLinus Torvalds struct sctp_chunk *retval; 6971da177e4SLinus Torvalds sctp_ecnehdr_t ecne; 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 700072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, 7011da177e4SLinus Torvalds sizeof(sctp_ecnehdr_t)); 7021da177e4SLinus Torvalds if (!retval) 7031da177e4SLinus Torvalds goto nodata; 7041da177e4SLinus Torvalds retval->subh.ecne_hdr = 7051da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds nodata: 7081da177e4SLinus Torvalds return retval; 7091da177e4SLinus Torvalds } 7101da177e4SLinus Torvalds 7111da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 7121da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 7131da177e4SLinus Torvalds */ 7141da177e4SLinus Torvalds struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, 7151da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 7161da177e4SLinus Torvalds int data_len, __u8 flags, __u16 ssn) 7171da177e4SLinus Torvalds { 7181da177e4SLinus Torvalds struct sctp_chunk *retval; 7191da177e4SLinus Torvalds struct sctp_datahdr dp; 7201da177e4SLinus Torvalds int chunk_len; 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 7231da177e4SLinus Torvalds * creating the chunk. 7241da177e4SLinus Torvalds */ 7251da177e4SLinus Torvalds dp.tsn = 0; 7261da177e4SLinus Torvalds dp.stream = htons(sinfo->sinfo_stream); 7271da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 730eaa5c54dSIvan Skytte Jorgensen if (sinfo->sinfo_flags & SCTP_UNORDERED) { 7311da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 7321da177e4SLinus Torvalds dp.ssn = 0; 7331da177e4SLinus Torvalds } else 7341da177e4SLinus Torvalds dp.ssn = htons(ssn); 7351da177e4SLinus Torvalds 7361da177e4SLinus Torvalds chunk_len = sizeof(dp) + data_len; 737072017b4SVlad Yasevich retval = sctp_make_data(asoc, flags, chunk_len); 7381da177e4SLinus Torvalds if (!retval) 7391da177e4SLinus Torvalds goto nodata; 7401da177e4SLinus Torvalds 7411da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 7421da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds nodata: 7451da177e4SLinus Torvalds return retval; 7461da177e4SLinus Torvalds } 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 7491da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 7501da177e4SLinus Torvalds * including duplicates and gaps. 7511da177e4SLinus Torvalds */ 7521da177e4SLinus Torvalds struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) 7531da177e4SLinus Torvalds { 7541da177e4SLinus Torvalds struct sctp_chunk *retval; 7551da177e4SLinus Torvalds struct sctp_sackhdr sack; 7561da177e4SLinus Torvalds int len; 7571da177e4SLinus Torvalds __u32 ctsn; 7581da177e4SLinus Torvalds __u16 num_gabs, num_dup_tsns; 7594244854dSNeil Horman struct sctp_association *aptr = (struct sctp_association *)asoc; 7601da177e4SLinus Torvalds struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 76102015180SVlad Yasevich struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; 7624244854dSNeil Horman struct sctp_transport *trans; 7631da177e4SLinus Torvalds 76402015180SVlad Yasevich memset(gabs, 0, sizeof(gabs)); 7651da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 766bb33381dSDaniel Borkmann 767bb33381dSDaniel Borkmann pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn); 7681da177e4SLinus Torvalds 7691da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 77002015180SVlad Yasevich num_gabs = sctp_tsnmap_num_gabs(map, gabs); 7711da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 7721da177e4SLinus Torvalds 7731da177e4SLinus Torvalds /* Initialize the SACK header. */ 7741da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 7751da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 7761da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 7771da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 7781da177e4SLinus Torvalds 7791da177e4SLinus Torvalds len = sizeof(sack) 7801da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 7811da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 7821da177e4SLinus Torvalds 7831da177e4SLinus Torvalds /* Create the chunk. */ 784072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len); 7851da177e4SLinus Torvalds if (!retval) 7861da177e4SLinus Torvalds goto nodata; 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7891da177e4SLinus Torvalds * 7901da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 7911da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 7921da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 7931da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 7941da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 7951da177e4SLinus Torvalds * reply chunk. 7961da177e4SLinus Torvalds * 7971da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 7981da177e4SLinus Torvalds * in packets from different source addresses in a single 7991da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 8001da177e4SLinus Torvalds * destination transport addresses from which the DATA or 8011da177e4SLinus Torvalds * control chunks being acknowledged were received. 8021da177e4SLinus Torvalds * 8031da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 8041da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 8051da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 8061da177e4SLinus Torvalds * duplicates. --piggy] 8071da177e4SLinus Torvalds * 8081da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 8091da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 8101da177e4SLinus Torvalds * destination address and not use the source address of the 8111da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 8121da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 8131da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 8141da177e4SLinus Torvalds * for the SACK is broken. 8151da177e4SLinus Torvalds * 8161da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 8171da177e4SLinus Torvalds */ 8181da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds retval->subh.sack_hdr = 8211da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 8221da177e4SLinus Torvalds 8231da177e4SLinus Torvalds /* Add the gap ack block information. */ 8241da177e4SLinus Torvalds if (num_gabs) 8251da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 82602015180SVlad Yasevich gabs); 8271da177e4SLinus Torvalds 8281da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 829196d6759SMichele Baldessari if (num_dup_tsns) { 830196d6759SMichele Baldessari aptr->stats.idupchunks += num_dup_tsns; 8311da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 8321da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 833196d6759SMichele Baldessari } 8344244854dSNeil Horman /* Once we have a sack generated, check to see what our sack 8354244854dSNeil Horman * generation is, if its 0, reset the transports to 0, and reset 8364244854dSNeil Horman * the association generation to 1 8374244854dSNeil Horman * 8384244854dSNeil Horman * The idea is that zero is never used as a valid generation for the 8394244854dSNeil Horman * association so no transport will match after a wrap event like this, 8404244854dSNeil Horman * Until the next sack 8414244854dSNeil Horman */ 8424244854dSNeil Horman if (++aptr->peer.sack_generation == 0) { 8434244854dSNeil Horman list_for_each_entry(trans, &asoc->peer.transport_addr_list, 8444244854dSNeil Horman transports) 8454244854dSNeil Horman trans->sack_generation = 0; 8464244854dSNeil Horman aptr->peer.sack_generation = 1; 8474244854dSNeil Horman } 8481da177e4SLinus Torvalds nodata: 8491da177e4SLinus Torvalds return retval; 8501da177e4SLinus Torvalds } 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 8531da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 8541da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8551da177e4SLinus Torvalds { 8561da177e4SLinus Torvalds struct sctp_chunk *retval; 8571da177e4SLinus Torvalds sctp_shutdownhdr_t shut; 8581da177e4SLinus Torvalds __u32 ctsn; 8591da177e4SLinus Torvalds 8601da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 8611da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 8621da177e4SLinus Torvalds 863072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, 8641da177e4SLinus Torvalds sizeof(sctp_shutdownhdr_t)); 8651da177e4SLinus Torvalds if (!retval) 8661da177e4SLinus Torvalds goto nodata; 8671da177e4SLinus Torvalds 8681da177e4SLinus Torvalds retval->subh.shutdown_hdr = 8691da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds if (chunk) 8721da177e4SLinus Torvalds retval->transport = chunk->transport; 8731da177e4SLinus Torvalds nodata: 8741da177e4SLinus Torvalds return retval; 8751da177e4SLinus Torvalds } 8761da177e4SLinus Torvalds 8771da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8781da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8791da177e4SLinus Torvalds { 8801da177e4SLinus Torvalds struct sctp_chunk *retval; 8811da177e4SLinus Torvalds 882072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0); 8831da177e4SLinus Torvalds 8841da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8851da177e4SLinus Torvalds * 8861da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8871da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8881da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8891da177e4SLinus Torvalds * to which it is replying. 8901da177e4SLinus Torvalds * 8911da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 8921da177e4SLinus Torvalds */ 8931da177e4SLinus Torvalds if (retval && chunk) 8941da177e4SLinus Torvalds retval->transport = chunk->transport; 8951da177e4SLinus Torvalds 8961da177e4SLinus Torvalds return retval; 8971da177e4SLinus Torvalds } 8981da177e4SLinus Torvalds 8991da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 9001da177e4SLinus Torvalds const struct sctp_association *asoc, 9011da177e4SLinus Torvalds const struct sctp_chunk *chunk) 9021da177e4SLinus Torvalds { 9031da177e4SLinus Torvalds struct sctp_chunk *retval; 9041da177e4SLinus Torvalds __u8 flags = 0; 9051da177e4SLinus Torvalds 906047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 907047a2428SJerome Forissier * reflected) 908047a2428SJerome Forissier */ 9091da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 9101da177e4SLinus Torvalds 911072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0); 9121da177e4SLinus Torvalds 9131da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9141da177e4SLinus Torvalds * 9151da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9161da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9171da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9181da177e4SLinus Torvalds * to which it is replying. 9191da177e4SLinus Torvalds * 9201da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 9211da177e4SLinus Torvalds * came from.] 9221da177e4SLinus Torvalds */ 9231da177e4SLinus Torvalds if (retval && chunk) 9241da177e4SLinus Torvalds retval->transport = chunk->transport; 9251da177e4SLinus Torvalds 9261da177e4SLinus Torvalds return retval; 9271da177e4SLinus Torvalds } 9281da177e4SLinus Torvalds 9291da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 930047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 9311da177e4SLinus Torvalds */ 9321da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 9331da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9341da177e4SLinus Torvalds const size_t hint) 9351da177e4SLinus Torvalds { 9361da177e4SLinus Torvalds struct sctp_chunk *retval; 9371da177e4SLinus Torvalds __u8 flags = 0; 9381da177e4SLinus Torvalds 939047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 940047a2428SJerome Forissier * an INIT (vtag will be reflected). 941047a2428SJerome Forissier */ 942047a2428SJerome Forissier if (!asoc) { 943047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 944047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 945047a2428SJerome Forissier flags = 0; 946047a2428SJerome Forissier else 947047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 948047a2428SJerome Forissier } 9491da177e4SLinus Torvalds 950072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint); 9511da177e4SLinus Torvalds 9521da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9531da177e4SLinus Torvalds * 9541da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9551da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9561da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9571da177e4SLinus Torvalds * to which it is replying. 9581da177e4SLinus Torvalds * 9591da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9601da177e4SLinus Torvalds */ 9611da177e4SLinus Torvalds if (retval && chunk) 9621da177e4SLinus Torvalds retval->transport = chunk->transport; 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds return retval; 9651da177e4SLinus Torvalds } 9661da177e4SLinus Torvalds 9671da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 9681da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 9691da177e4SLinus Torvalds const struct sctp_association *asoc, 9701da177e4SLinus Torvalds const struct sctp_chunk *chunk, __u32 tsn) 9711da177e4SLinus Torvalds { 9721da177e4SLinus Torvalds struct sctp_chunk *retval; 9739f81bcd9SAl Viro __be32 payload; 9741da177e4SLinus Torvalds 9751da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) 9761da177e4SLinus Torvalds + sizeof(tsn)); 9771da177e4SLinus Torvalds 9781da177e4SLinus Torvalds if (!retval) 9791da177e4SLinus Torvalds goto no_mem; 9801da177e4SLinus Torvalds 9811da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 9821da177e4SLinus Torvalds payload = htonl(tsn); 98300f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 98400f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 9851da177e4SLinus Torvalds 9861da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9871da177e4SLinus Torvalds * 9881da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9891da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9901da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9911da177e4SLinus Torvalds * to which it is replying. 9921da177e4SLinus Torvalds * 9931da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9941da177e4SLinus Torvalds */ 9951da177e4SLinus Torvalds if (chunk) 9961da177e4SLinus Torvalds retval->transport = chunk->transport; 9971da177e4SLinus Torvalds 9981da177e4SLinus Torvalds no_mem: 9991da177e4SLinus Torvalds return retval; 10001da177e4SLinus Torvalds } 10011da177e4SLinus Torvalds 10021da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 10031da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 1004c164a9baSSridhar Samudrala const struct msghdr *msg, 1005c164a9baSSridhar Samudrala size_t paylen) 10061da177e4SLinus Torvalds { 10071da177e4SLinus Torvalds struct sctp_chunk *retval; 1008c164a9baSSridhar Samudrala void *payload = NULL; 1009c164a9baSSridhar Samudrala int err; 10101da177e4SLinus Torvalds 1011c164a9baSSridhar Samudrala retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); 10121da177e4SLinus Torvalds if (!retval) 10131da177e4SLinus Torvalds goto err_chunk; 10141da177e4SLinus Torvalds 10151da177e4SLinus Torvalds if (paylen) { 10161da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 1017c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 10181da177e4SLinus Torvalds if (!payload) 10191da177e4SLinus Torvalds goto err_payload; 10201da177e4SLinus Torvalds 1021c164a9baSSridhar Samudrala err = memcpy_fromiovec(payload, msg->msg_iov, paylen); 1022c164a9baSSridhar Samudrala if (err < 0) 10231da177e4SLinus Torvalds goto err_copy; 10241da177e4SLinus Torvalds } 10251da177e4SLinus Torvalds 102600f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 102700f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10281da177e4SLinus Torvalds 10291da177e4SLinus Torvalds if (paylen) 10301da177e4SLinus Torvalds kfree(payload); 10311da177e4SLinus Torvalds 10321da177e4SLinus Torvalds return retval; 10331da177e4SLinus Torvalds 10341da177e4SLinus Torvalds err_copy: 10351da177e4SLinus Torvalds kfree(payload); 10361da177e4SLinus Torvalds err_payload: 10371da177e4SLinus Torvalds sctp_chunk_free(retval); 10381da177e4SLinus Torvalds retval = NULL; 10391da177e4SLinus Torvalds err_chunk: 10401da177e4SLinus Torvalds return retval; 10411da177e4SLinus Torvalds } 10421da177e4SLinus Torvalds 10435c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 10445c94bf86SAdrian Bunk * enough. 10455c94bf86SAdrian Bunk */ 10465c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 10475c94bf86SAdrian Bunk const void *data) 10485c94bf86SAdrian Bunk { 10495c94bf86SAdrian Bunk void *target; 10505c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 10515c94bf86SAdrian Bunk 10525c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 10535c94bf86SAdrian Bunk 10546383cfb3SVlad Yasevich if (data) 10555c94bf86SAdrian Bunk memcpy(target, data, len); 10566383cfb3SVlad Yasevich else 10576383cfb3SVlad Yasevich memset(target, 0, len); 10585c94bf86SAdrian Bunk 10595c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 10605c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 10615c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 10625c94bf86SAdrian Bunk 10635c94bf86SAdrian Bunk return target; 10645c94bf86SAdrian Bunk } 10655c94bf86SAdrian Bunk 10661da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 10671da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 10681da177e4SLinus Torvalds const struct sctp_association *asoc, 10691da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10701da177e4SLinus Torvalds const __u8 *payload, 10711da177e4SLinus Torvalds const size_t paylen) 10721da177e4SLinus Torvalds { 10731da177e4SLinus Torvalds struct sctp_chunk *retval; 10741da177e4SLinus Torvalds struct sctp_paramhdr phdr; 10751da177e4SLinus Torvalds 10761da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen 107700f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10781da177e4SLinus Torvalds if (!retval) 10791da177e4SLinus Torvalds goto end; 10801da177e4SLinus Torvalds 108100f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen 108200f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10831da177e4SLinus Torvalds 10841da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 10851da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 108600f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 108700f1c2dfSWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr); 10881da177e4SLinus Torvalds 10891da177e4SLinus Torvalds end: 10901da177e4SLinus Torvalds return retval; 10911da177e4SLinus Torvalds } 10921da177e4SLinus Torvalds 1093ba016670SWei Yongjun struct sctp_chunk *sctp_make_violation_paramlen( 1094ba016670SWei Yongjun const struct sctp_association *asoc, 1095ba016670SWei Yongjun const struct sctp_chunk *chunk, 1096ba016670SWei Yongjun struct sctp_paramhdr *param) 1097ba016670SWei Yongjun { 1098ba016670SWei Yongjun struct sctp_chunk *retval; 1099ba016670SWei Yongjun static const char error[] = "The following parameter had invalid length:"; 1100ba016670SWei Yongjun size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) + 1101ba016670SWei Yongjun sizeof(sctp_paramhdr_t); 1102ba016670SWei Yongjun 1103ba016670SWei Yongjun retval = sctp_make_abort(asoc, chunk, payload_len); 1104ba016670SWei Yongjun if (!retval) 1105ba016670SWei Yongjun goto nodata; 1106ba016670SWei Yongjun 1107ba016670SWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, 1108ba016670SWei Yongjun sizeof(error) + sizeof(sctp_paramhdr_t)); 1109ba016670SWei Yongjun sctp_addto_chunk(retval, sizeof(error), error); 1110ba016670SWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param); 1111ba016670SWei Yongjun 1112ba016670SWei Yongjun nodata: 1113ba016670SWei Yongjun return retval; 1114ba016670SWei Yongjun } 1115ba016670SWei Yongjun 1116de4594a5SNeil Horman struct sctp_chunk *sctp_make_violation_max_retrans( 1117de4594a5SNeil Horman const struct sctp_association *asoc, 1118de4594a5SNeil Horman const struct sctp_chunk *chunk) 1119de4594a5SNeil Horman { 1120de4594a5SNeil Horman struct sctp_chunk *retval; 1121de4594a5SNeil Horman static const char error[] = "Association exceeded its max_retans count"; 1122de4594a5SNeil Horman size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t); 1123de4594a5SNeil Horman 1124de4594a5SNeil Horman retval = sctp_make_abort(asoc, chunk, payload_len); 1125de4594a5SNeil Horman if (!retval) 1126de4594a5SNeil Horman goto nodata; 1127de4594a5SNeil Horman 1128de4594a5SNeil Horman sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); 1129de4594a5SNeil Horman sctp_addto_chunk(retval, sizeof(error), error); 1130de4594a5SNeil Horman 1131de4594a5SNeil Horman nodata: 1132de4594a5SNeil Horman return retval; 1133de4594a5SNeil Horman } 1134de4594a5SNeil Horman 11351da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 11361da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 113792c73af5SWei Yongjun const struct sctp_transport *transport) 11381da177e4SLinus Torvalds { 113992c73af5SWei Yongjun struct sctp_chunk *retval; 114092c73af5SWei Yongjun sctp_sender_hb_info_t hbinfo; 114192c73af5SWei Yongjun 1142072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, sizeof(hbinfo)); 11431da177e4SLinus Torvalds 11441da177e4SLinus Torvalds if (!retval) 11451da177e4SLinus Torvalds goto nodata; 11461da177e4SLinus Torvalds 114792c73af5SWei Yongjun hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; 114892c73af5SWei Yongjun hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t)); 114992c73af5SWei Yongjun hbinfo.daddr = transport->ipaddr; 115092c73af5SWei Yongjun hbinfo.sent_at = jiffies; 115192c73af5SWei Yongjun hbinfo.hb_nonce = transport->hb_nonce; 115292c73af5SWei Yongjun 11531da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 11541da177e4SLinus Torvalds * what transport it belongs to. 11551da177e4SLinus Torvalds */ 11561da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 115792c73af5SWei Yongjun retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), 115892c73af5SWei Yongjun &hbinfo); 11591da177e4SLinus Torvalds 11601da177e4SLinus Torvalds nodata: 11611da177e4SLinus Torvalds return retval; 11621da177e4SLinus Torvalds } 11631da177e4SLinus Torvalds 11641da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 11651da177e4SLinus Torvalds const struct sctp_chunk *chunk, 11661da177e4SLinus Torvalds const void *payload, const size_t paylen) 11671da177e4SLinus Torvalds { 11681da177e4SLinus Torvalds struct sctp_chunk *retval; 11691da177e4SLinus Torvalds 1170072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen); 11711da177e4SLinus Torvalds if (!retval) 11721da177e4SLinus Torvalds goto nodata; 11731da177e4SLinus Torvalds 11741da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 11751da177e4SLinus Torvalds 11761da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11771da177e4SLinus Torvalds * 11781da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11791da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 11801da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 11811da177e4SLinus Torvalds * to which it is replying. 11821da177e4SLinus Torvalds * 11831da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 11841da177e4SLinus Torvalds */ 11851da177e4SLinus Torvalds if (chunk) 11861da177e4SLinus Torvalds retval->transport = chunk->transport; 11871da177e4SLinus Torvalds 11881da177e4SLinus Torvalds nodata: 11891da177e4SLinus Torvalds return retval; 11901da177e4SLinus Torvalds } 11911da177e4SLinus Torvalds 11921da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 11931da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 11941da177e4SLinus Torvalds */ 11951da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 11961da177e4SLinus Torvalds const struct sctp_association *asoc, 11971da177e4SLinus Torvalds const struct sctp_chunk *chunk, 11981da177e4SLinus Torvalds size_t size) 11991da177e4SLinus Torvalds { 12001da177e4SLinus Torvalds struct sctp_chunk *retval; 12011da177e4SLinus Torvalds 1202072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, 12031da177e4SLinus Torvalds sizeof(sctp_errhdr_t) + size); 12041da177e4SLinus Torvalds if (!retval) 12051da177e4SLinus Torvalds goto nodata; 12061da177e4SLinus Torvalds 12071da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 12081da177e4SLinus Torvalds * 12091da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 12101da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 12111da177e4SLinus Torvalds * address from which it received the DATA or control chunk 12121da177e4SLinus Torvalds * to which it is replying. 12131da177e4SLinus Torvalds * 12141da177e4SLinus Torvalds */ 12151da177e4SLinus Torvalds if (chunk) 12161da177e4SLinus Torvalds retval->transport = chunk->transport; 12171da177e4SLinus Torvalds 12181da177e4SLinus Torvalds nodata: 12191da177e4SLinus Torvalds return retval; 12201da177e4SLinus Torvalds } 12211da177e4SLinus Torvalds 12225fa782c2SNeil Horman /* Create an Operation Error chunk of a fixed size, 12235fa782c2SNeil Horman * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) 12245fa782c2SNeil Horman * This is a helper function to allocate an error chunk for 12255fa782c2SNeil Horman * for those invalid parameter codes in which we may not want 1226d82603c6SJorrit Schippers * to report all the errors, if the incoming chunk is large 12275fa782c2SNeil Horman */ 12285fa782c2SNeil Horman static inline struct sctp_chunk *sctp_make_op_error_fixed( 12295fa782c2SNeil Horman const struct sctp_association *asoc, 12305fa782c2SNeil Horman const struct sctp_chunk *chunk) 12315fa782c2SNeil Horman { 12325fa782c2SNeil Horman size_t size = asoc ? asoc->pathmtu : 0; 12335fa782c2SNeil Horman 12345fa782c2SNeil Horman if (!size) 12355fa782c2SNeil Horman size = SCTP_DEFAULT_MAXSEGMENT; 12365fa782c2SNeil Horman 12375fa782c2SNeil Horman return sctp_make_op_error_space(asoc, chunk, size); 12385fa782c2SNeil Horman } 12395fa782c2SNeil Horman 12401da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 12411da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 12421da177e4SLinus Torvalds const struct sctp_chunk *chunk, 124363706c5cSAl Viro __be16 cause_code, const void *payload, 12446383cfb3SVlad Yasevich size_t paylen, size_t reserve_tail) 12451da177e4SLinus Torvalds { 12461da177e4SLinus Torvalds struct sctp_chunk *retval; 12471da177e4SLinus Torvalds 12486383cfb3SVlad Yasevich retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); 12491da177e4SLinus Torvalds if (!retval) 12501da177e4SLinus Torvalds goto nodata; 12511da177e4SLinus Torvalds 12526383cfb3SVlad Yasevich sctp_init_cause(retval, cause_code, paylen + reserve_tail); 125300f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 12546383cfb3SVlad Yasevich if (reserve_tail) 12556383cfb3SVlad Yasevich sctp_addto_param(retval, reserve_tail, NULL); 12561da177e4SLinus Torvalds 12571da177e4SLinus Torvalds nodata: 12581da177e4SLinus Torvalds return retval; 12591da177e4SLinus Torvalds } 12601da177e4SLinus Torvalds 12614cd57c80SVlad Yasevich struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) 12624cd57c80SVlad Yasevich { 12634cd57c80SVlad Yasevich struct sctp_chunk *retval; 12644cd57c80SVlad Yasevich struct sctp_hmac *hmac_desc; 12654cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 12664cd57c80SVlad Yasevich __u8 *hmac; 12674cd57c80SVlad Yasevich 12684cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 12694cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 12704cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 12714cd57c80SVlad Yasevich return NULL; 12724cd57c80SVlad Yasevich 1273072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, 12744cd57c80SVlad Yasevich hmac_desc->hmac_len + sizeof(sctp_authhdr_t)); 12754cd57c80SVlad Yasevich if (!retval) 12764cd57c80SVlad Yasevich return NULL; 12774cd57c80SVlad Yasevich 12784cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 12794cd57c80SVlad Yasevich auth_hdr.shkey_id = htons(asoc->active_key_id); 12804cd57c80SVlad Yasevich 12814cd57c80SVlad Yasevich retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t), 12824cd57c80SVlad Yasevich &auth_hdr); 12834cd57c80SVlad Yasevich 12844cd57c80SVlad Yasevich hmac = skb_put(retval->skb, hmac_desc->hmac_len); 12854cd57c80SVlad Yasevich memset(hmac, 0, hmac_desc->hmac_len); 12864cd57c80SVlad Yasevich 12874cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 12884cd57c80SVlad Yasevich retval->chunk_hdr->length = 12894cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 12904cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 12914cd57c80SVlad Yasevich 12924cd57c80SVlad Yasevich return retval; 12934cd57c80SVlad Yasevich } 12944cd57c80SVlad Yasevich 12954cd57c80SVlad Yasevich 12961da177e4SLinus Torvalds /******************************************************************** 12971da177e4SLinus Torvalds * 2nd Level Abstractions 12981da177e4SLinus Torvalds ********************************************************************/ 12991da177e4SLinus Torvalds 13001da177e4SLinus Torvalds /* Turn an skb into a chunk. 13011da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 13023dc0a548Swangweidong * 13033dc0a548Swangweidong * sctpimpguide-05.txt Section 2.8.2 13043dc0a548Swangweidong * M1) Each time a new DATA chunk is transmitted 13053dc0a548Swangweidong * set the 'TSN.Missing.Report' count for that TSN to 0. The 13063dc0a548Swangweidong * 'TSN.Missing.Report' count will be used to determine missing chunks 13073dc0a548Swangweidong * and when to fast retransmit. 13083dc0a548Swangweidong * 13091da177e4SLinus Torvalds */ 13101da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 13111da177e4SLinus Torvalds const struct sctp_association *asoc, 13121da177e4SLinus Torvalds struct sock *sk) 13131da177e4SLinus Torvalds { 13141da177e4SLinus Torvalds struct sctp_chunk *retval; 13151da177e4SLinus Torvalds 1316c3762229SRobert P. J. Day retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC); 13171da177e4SLinus Torvalds 13181da177e4SLinus Torvalds if (!retval) 13191da177e4SLinus Torvalds goto nodata; 1320bb33381dSDaniel Borkmann if (!sk) 1321bb33381dSDaniel Borkmann pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); 13221da177e4SLinus Torvalds 132379af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 13241da177e4SLinus Torvalds retval->skb = skb; 13251da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 13261da177e4SLinus Torvalds retval->singleton = 1; 13271da177e4SLinus Torvalds 1328c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 13291da177e4SLinus Torvalds 13301da177e4SLinus Torvalds /* Polish the bead hole. */ 13311da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 13321da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 13331da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 13341da177e4SLinus Torvalds atomic_set(&retval->refcnt, 1); 13351da177e4SLinus Torvalds 13361da177e4SLinus Torvalds nodata: 13371da177e4SLinus Torvalds return retval; 13381da177e4SLinus Torvalds } 13391da177e4SLinus Torvalds 13401da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 13411da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 13421da177e4SLinus Torvalds union sctp_addr *dest) 13431da177e4SLinus Torvalds { 1344f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 134516b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 13461da177e4SLinus Torvalds } 13471da177e4SLinus Torvalds 13481da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 13491da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 13501da177e4SLinus Torvalds { 13511da177e4SLinus Torvalds /* If we have a known transport, use that. */ 13521da177e4SLinus Torvalds if (chunk->transport) { 13536a1e5f33SAl Viro return &chunk->transport->ipaddr; 13541da177e4SLinus Torvalds } else { 13551da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 13566a1e5f33SAl Viro return &chunk->source; 13571da177e4SLinus Torvalds } 13581da177e4SLinus Torvalds } 13591da177e4SLinus Torvalds 13601da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 13611da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 13621da177e4SLinus Torvalds */ 1363072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 13641da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen) 13651da177e4SLinus Torvalds { 13661da177e4SLinus Torvalds struct sctp_chunk *retval; 13671da177e4SLinus Torvalds sctp_chunkhdr_t *chunk_hdr; 13681da177e4SLinus Torvalds struct sk_buff *skb; 13691da177e4SLinus Torvalds struct sock *sk; 13701da177e4SLinus Torvalds 13711da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 13721da177e4SLinus Torvalds skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), 13731da177e4SLinus Torvalds GFP_ATOMIC); 13741da177e4SLinus Torvalds if (!skb) 13751da177e4SLinus Torvalds goto nodata; 13761da177e4SLinus Torvalds 13771da177e4SLinus Torvalds /* Make room for the chunk header. */ 13781da177e4SLinus Torvalds chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); 13791da177e4SLinus Torvalds chunk_hdr->type = type; 13801da177e4SLinus Torvalds chunk_hdr->flags = flags; 13811da177e4SLinus Torvalds chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); 13821da177e4SLinus Torvalds 13831da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 13841da177e4SLinus Torvalds retval = sctp_chunkify(skb, asoc, sk); 13851da177e4SLinus Torvalds if (!retval) { 13861da177e4SLinus Torvalds kfree_skb(skb); 13871da177e4SLinus Torvalds goto nodata; 13881da177e4SLinus Torvalds } 13891da177e4SLinus Torvalds 13901da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 13911da177e4SLinus Torvalds retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); 13921da177e4SLinus Torvalds 13934cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 13944cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 13954cd57c80SVlad Yasevich retval->auth = 1; 13964cd57c80SVlad Yasevich 13971da177e4SLinus Torvalds return retval; 13981da177e4SLinus Torvalds nodata: 13991da177e4SLinus Torvalds return NULL; 14001da177e4SLinus Torvalds } 14011da177e4SLinus Torvalds 1402072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 1403072017b4SVlad Yasevich __u8 flags, int paylen) 1404072017b4SVlad Yasevich { 1405072017b4SVlad Yasevich return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen); 1406072017b4SVlad Yasevich } 1407072017b4SVlad Yasevich 1408072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 1409072017b4SVlad Yasevich __u8 type, __u8 flags, int paylen) 1410072017b4SVlad Yasevich { 1411072017b4SVlad Yasevich struct sctp_chunk *chunk = _sctp_make_chunk(asoc, type, flags, paylen); 1412072017b4SVlad Yasevich 1413072017b4SVlad Yasevich if (chunk) 1414072017b4SVlad Yasevich sctp_control_set_owner_w(chunk); 1415072017b4SVlad Yasevich 1416072017b4SVlad Yasevich return chunk; 1417072017b4SVlad Yasevich } 14181da177e4SLinus Torvalds 14191da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 14201da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 14211da177e4SLinus Torvalds { 1422a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1423a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1424a08de64dSVlad Yasevich 1425c485658bSDaniel Borkmann consume_skb(chunk->skb); 1426c485658bSDaniel Borkmann consume_skb(chunk->auth_chunk); 14271da177e4SLinus Torvalds 14281da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 14291da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 14301da177e4SLinus Torvalds } 14311da177e4SLinus Torvalds 14321da177e4SLinus Torvalds /* Possibly, free the chunk. */ 14331da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 14341da177e4SLinus Torvalds { 14351da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 14361da177e4SLinus Torvalds if (chunk->msg) 14371da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 14381da177e4SLinus Torvalds 14391da177e4SLinus Torvalds sctp_chunk_put(chunk); 14401da177e4SLinus Torvalds } 14411da177e4SLinus Torvalds 14421da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 14431da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 14441da177e4SLinus Torvalds { 14451da177e4SLinus Torvalds atomic_inc(&ch->refcnt); 14461da177e4SLinus Torvalds } 14471da177e4SLinus Torvalds 14481da177e4SLinus Torvalds /* Release a reference to the chunk. */ 14491da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 14501da177e4SLinus Torvalds { 14511da177e4SLinus Torvalds if (atomic_dec_and_test(&ch->refcnt)) 14521da177e4SLinus Torvalds sctp_chunk_destroy(ch); 14531da177e4SLinus Torvalds } 14541da177e4SLinus Torvalds 14551da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 14561da177e4SLinus Torvalds * enough. 14571da177e4SLinus Torvalds */ 14581da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 14591da177e4SLinus Torvalds { 14601da177e4SLinus Torvalds void *target; 14611da177e4SLinus Torvalds void *padding; 14621da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 14638d614adeSWei Yongjun int padlen = WORD_ROUND(chunklen) - chunklen; 14641da177e4SLinus Torvalds 14651da177e4SLinus Torvalds padding = skb_put(chunk->skb, padlen); 14661da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 14671da177e4SLinus Torvalds 14681da177e4SLinus Torvalds memset(padding, 0, padlen); 14691da177e4SLinus Torvalds memcpy(target, data, len); 14701da177e4SLinus Torvalds 14711da177e4SLinus Torvalds /* Adjust the chunk length field. */ 14721da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 147327a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 14741da177e4SLinus Torvalds 14751da177e4SLinus Torvalds return target; 14761da177e4SLinus Torvalds } 14771da177e4SLinus Torvalds 14785fa782c2SNeil Horman /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient 14795fa782c2SNeil Horman * space in the chunk 14805fa782c2SNeil Horman */ 14816daaf0deSstephen hemminger static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk, 14825fa782c2SNeil Horman int len, const void *data) 14835fa782c2SNeil Horman { 14842e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) >= len) 14855fa782c2SNeil Horman return sctp_addto_chunk(chunk, len, data); 14865fa782c2SNeil Horman else 14875fa782c2SNeil Horman return NULL; 14885fa782c2SNeil Horman } 14895fa782c2SNeil Horman 14901da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 14911da177e4SLinus Torvalds * chunk is not big enough. 14921da177e4SLinus Torvalds * Returns a kernel err value. 14931da177e4SLinus Torvalds */ 14941da177e4SLinus Torvalds int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 14951da177e4SLinus Torvalds struct iovec *data) 14961da177e4SLinus Torvalds { 14971da177e4SLinus Torvalds __u8 *target; 14981da177e4SLinus Torvalds int err = 0; 14991da177e4SLinus Torvalds 15001da177e4SLinus Torvalds /* Make room in chunk for data. */ 15011da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 15021da177e4SLinus Torvalds 15031da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 15041da177e4SLinus Torvalds if ((err = memcpy_fromiovecend(target, data, off, len))) 15051da177e4SLinus Torvalds goto out; 15061da177e4SLinus Torvalds 15071da177e4SLinus Torvalds /* Adjust the chunk length field. */ 15081da177e4SLinus Torvalds chunk->chunk_hdr->length = 15091da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 151027a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 15111da177e4SLinus Torvalds 15121da177e4SLinus Torvalds out: 15131da177e4SLinus Torvalds return err; 15141da177e4SLinus Torvalds } 15151da177e4SLinus Torvalds 15161da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15171da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15181da177e4SLinus Torvalds */ 15191da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 15201da177e4SLinus Torvalds { 1521ab3e5e7bSVlad Yasevich struct sctp_datamsg *msg; 1522ab3e5e7bSVlad Yasevich struct sctp_chunk *lchunk; 1523ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 15241da177e4SLinus Torvalds __u16 ssn; 15251da177e4SLinus Torvalds __u16 sid; 15261da177e4SLinus Torvalds 15271da177e4SLinus Torvalds if (chunk->has_ssn) 15281da177e4SLinus Torvalds return; 15291da177e4SLinus Torvalds 1530ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1531ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1532ab3e5e7bSVlad Yasevich stream = &chunk->asoc->ssnmap->out; 1533ab3e5e7bSVlad Yasevich 1534ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1535ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1536ab3e5e7bSVlad Yasevich */ 1537ab3e5e7bSVlad Yasevich msg = chunk->msg; 1538ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1539ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 15401da177e4SLinus Torvalds ssn = 0; 15411da177e4SLinus Torvalds } else { 1542ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1543ab3e5e7bSVlad Yasevich ssn = sctp_ssn_next(stream, sid); 15441da177e4SLinus Torvalds else 1545ab3e5e7bSVlad Yasevich ssn = sctp_ssn_peek(stream, sid); 15461da177e4SLinus Torvalds } 15471da177e4SLinus Torvalds 1548ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1549ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1550ab3e5e7bSVlad Yasevich } 15511da177e4SLinus Torvalds } 15521da177e4SLinus Torvalds 15531da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15541da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15551da177e4SLinus Torvalds */ 15561da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 15571da177e4SLinus Torvalds { 15581da177e4SLinus Torvalds if (!chunk->has_tsn) { 15591da177e4SLinus Torvalds /* This is the last possible instant to 15601da177e4SLinus Torvalds * assign a TSN. 15611da177e4SLinus Torvalds */ 15621da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 15631da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 15641da177e4SLinus Torvalds chunk->has_tsn = 1; 15651da177e4SLinus Torvalds } 15661da177e4SLinus Torvalds } 15671da177e4SLinus Torvalds 15681da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 15691da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 15703182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1571dd0fc66fSAl Viro gfp_t gfp) 15721da177e4SLinus Torvalds { 15731da177e4SLinus Torvalds struct sctp_association *asoc; 15741da177e4SLinus Torvalds struct sk_buff *skb; 15751da177e4SLinus Torvalds sctp_scope_t scope; 15761da177e4SLinus Torvalds struct sctp_af *af; 15771da177e4SLinus Torvalds 15781da177e4SLinus Torvalds /* Create the bare association. */ 15791da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 15801da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 15811da177e4SLinus Torvalds if (!asoc) 15821da177e4SLinus Torvalds goto nodata; 15831da177e4SLinus Torvalds asoc->temp = 1; 15841da177e4SLinus Torvalds skb = chunk->skb; 15851da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1586eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version)); 15871da177e4SLinus Torvalds if (unlikely(!af)) 15881da177e4SLinus Torvalds goto fail; 1589d55c41b1SAl Viro af->from_skb(&asoc->c.peer_addr, skb, 1); 15901da177e4SLinus Torvalds nodata: 15911da177e4SLinus Torvalds return asoc; 15921da177e4SLinus Torvalds 15931da177e4SLinus Torvalds fail: 15941da177e4SLinus Torvalds sctp_association_free(asoc); 15951da177e4SLinus Torvalds return NULL; 15961da177e4SLinus Torvalds } 15971da177e4SLinus Torvalds 15981da177e4SLinus Torvalds /* Build a cookie representing asoc. 15991da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 16001da177e4SLinus Torvalds */ 16011da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 16021da177e4SLinus Torvalds const struct sctp_association *asoc, 16031da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 16041da177e4SLinus Torvalds int *cookie_len, 16051da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len) 16061da177e4SLinus Torvalds { 16071da177e4SLinus Torvalds sctp_cookie_param_t *retval; 16081da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 16091da177e4SLinus Torvalds struct scatterlist sg; 16101da177e4SLinus Torvalds int headersize, bodysize; 16111da177e4SLinus Torvalds 16129834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 16139834a2bbSVlad Yasevich * any padding. 16149834a2bbSVlad Yasevich */ 16159834a2bbSVlad Yasevich headersize = sizeof(sctp_paramhdr_t) + 16169834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 16179834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 16181da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 16191da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 16201da177e4SLinus Torvalds 16211da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 16221da177e4SLinus Torvalds * functions simpler to write. 16231da177e4SLinus Torvalds */ 16241da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 16251da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 16261da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 16271da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 16281da177e4SLinus Torvalds 16291da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 16301da177e4SLinus Torvalds * out on the network. 16311da177e4SLinus Torvalds */ 1632af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1633af997d8cSArnaldo Carvalho de Melo if (!retval) 1634af997d8cSArnaldo Carvalho de Melo goto nodata; 1635af997d8cSArnaldo Carvalho de Melo 16361da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 16371da177e4SLinus Torvalds 16381da177e4SLinus Torvalds /* Set up the parameter header. */ 16391da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 16401da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 16411da177e4SLinus Torvalds 16421da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 16431da177e4SLinus Torvalds cookie->c = asoc->c; 16441da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 16451da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 16461da177e4SLinus Torvalds 16471da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 16481da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 16491da177e4SLinus Torvalds 16500f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 16510f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 16521da177e4SLinus Torvalds 16531da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 165452db882fSDaniel Borkmann cookie->c.expiration = ktime_add(asoc->cookie_life, 165552db882fSDaniel Borkmann ktime_get()); 16561da177e4SLinus Torvalds 16571da177e4SLinus Torvalds /* Copy the peer's init packet. */ 16581da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 16591da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 16601da177e4SLinus Torvalds 16611da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 16621da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 16631da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 16641da177e4SLinus Torvalds 16651da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 16661b489e11SHerbert Xu struct hash_desc desc; 16671b489e11SHerbert Xu 16681da177e4SLinus Torvalds /* Sign the message. */ 166968e3f5ddSHerbert Xu sg_init_one(&sg, &cookie->c, bodysize); 16701b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 16711b489e11SHerbert Xu desc.flags = 0; 16721da177e4SLinus Torvalds 1673570617e7SDaniel Borkmann if (crypto_hash_setkey(desc.tfm, ep->secret_key, 1674570617e7SDaniel Borkmann sizeof(ep->secret_key)) || 16751b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, cookie->signature)) 16761b489e11SHerbert Xu goto free_cookie; 16771da177e4SLinus Torvalds } 16781da177e4SLinus Torvalds 16791da177e4SLinus Torvalds return retval; 16801b489e11SHerbert Xu 16811b489e11SHerbert Xu free_cookie: 16821b489e11SHerbert Xu kfree(retval); 16831b489e11SHerbert Xu nodata: 16841b489e11SHerbert Xu *cookie_len = 0; 16851b489e11SHerbert Xu return NULL; 16861da177e4SLinus Torvalds } 16871da177e4SLinus Torvalds 16881da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 16891da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 16901da177e4SLinus Torvalds const struct sctp_endpoint *ep, 16911da177e4SLinus Torvalds const struct sctp_association *asoc, 1692dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 16931da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 16941da177e4SLinus Torvalds { 16951da177e4SLinus Torvalds struct sctp_association *retval = NULL; 16961da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 16971da177e4SLinus Torvalds struct sctp_cookie *bear_cookie; 16981da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1699313e7b4dSVlad Yasevich __u8 *digest = ep->digest; 17001da177e4SLinus Torvalds struct scatterlist sg; 1701570617e7SDaniel Borkmann unsigned int len; 17021da177e4SLinus Torvalds sctp_scope_t scope; 17031da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 170452db882fSDaniel Borkmann ktime_t kt; 17051b489e11SHerbert Xu struct hash_desc desc; 17061da177e4SLinus Torvalds 17079834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 17089834a2bbSVlad Yasevich * any padding. 17099834a2bbSVlad Yasevich */ 17109834a2bbSVlad Yasevich headersize = sizeof(sctp_chunkhdr_t) + 17119834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 17129834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 17131da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 17141da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 17151da177e4SLinus Torvalds 17161da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 17171da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 17181da177e4SLinus Torvalds * INIT chunk. 17191da177e4SLinus Torvalds */ 17201da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17211da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 17221da177e4SLinus Torvalds goto malformed; 17231da177e4SLinus Torvalds 17241da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 17251da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 17261da177e4SLinus Torvalds goto malformed; 17271da177e4SLinus Torvalds 17281da177e4SLinus Torvalds /* Process the cookie. */ 17291da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 17301da177e4SLinus Torvalds bear_cookie = &cookie->c; 17311da177e4SLinus Torvalds 17321da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 17331da177e4SLinus Torvalds goto no_hmac; 17341da177e4SLinus Torvalds 17351da177e4SLinus Torvalds /* Check the signature. */ 173668e3f5ddSHerbert Xu sg_init_one(&sg, bear_cookie, bodysize); 17371b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 17381b489e11SHerbert Xu desc.flags = 0; 17391da177e4SLinus Torvalds 17408ca84481SAl Viro memset(digest, 0x00, SCTP_SIGNATURE_SIZE); 1741570617e7SDaniel Borkmann if (crypto_hash_setkey(desc.tfm, ep->secret_key, 1742570617e7SDaniel Borkmann sizeof(ep->secret_key)) || 17431b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, digest)) { 17441b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17451b489e11SHerbert Xu goto fail; 17461b489e11SHerbert Xu } 17471da177e4SLinus Torvalds 17481da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 17491da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 17501da177e4SLinus Torvalds goto fail; 17511da177e4SLinus Torvalds } 17521da177e4SLinus Torvalds 17531da177e4SLinus Torvalds no_hmac: 17541da177e4SLinus Torvalds /* IG Section 2.35.2: 17551da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 17561da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 17571da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 17581da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 17591da177e4SLinus Torvalds * discarded, 17601da177e4SLinus Torvalds */ 17611da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 17621da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 17631da177e4SLinus Torvalds goto fail; 17641da177e4SLinus Torvalds } 17651da177e4SLinus Torvalds 17669b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 17671da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 17681da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 17691da177e4SLinus Torvalds goto fail; 17701da177e4SLinus Torvalds } 17711da177e4SLinus Torvalds 17721da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 17731da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 17741da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1775f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1776f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1777f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1778f236218bSVlad Yasevich * down the new association establishment instead of every packet. 17791da177e4SLinus Torvalds */ 1780f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 178152db882fSDaniel Borkmann kt = skb_get_ktime(skb); 1782f236218bSVlad Yasevich else 178352db882fSDaniel Borkmann kt = ktime_get(); 1784f236218bSVlad Yasevich 178567cb9366SDaniel Borkmann if (!asoc && ktime_before(bear_cookie->expiration, kt)) { 17861da177e4SLinus Torvalds /* 17871da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 17881da177e4SLinus Torvalds * 17891da177e4SLinus Torvalds * Cause of error 17901da177e4SLinus Torvalds * --------------- 17911da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 17921da177e4SLinus Torvalds * Cookie that has expired. 17931da177e4SLinus Torvalds */ 17941da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17951da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 17961da177e4SLinus Torvalds if (*errp) { 179752db882fSDaniel Borkmann suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); 179834bcca28SAl Viro __be32 n = htonl(usecs); 17991da177e4SLinus Torvalds 18001da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, 180100f1c2dfSWei Yongjun sizeof(n)); 180200f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(n), &n); 18031da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 18041da177e4SLinus Torvalds } else 18051da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18061da177e4SLinus Torvalds 18071da177e4SLinus Torvalds goto fail; 18081da177e4SLinus Torvalds } 18091da177e4SLinus Torvalds 18101da177e4SLinus Torvalds /* Make a new base association. */ 18111da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 18121da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 18131da177e4SLinus Torvalds if (!retval) { 18141da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18151da177e4SLinus Torvalds goto fail; 18161da177e4SLinus Torvalds } 18171da177e4SLinus Torvalds 18181da177e4SLinus Torvalds /* Set up our peer's port number. */ 18191da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 18201da177e4SLinus Torvalds 18211da177e4SLinus Torvalds /* Populate the association from the cookie. */ 18221da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 18231da177e4SLinus Torvalds 18241da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 18251da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 18261da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18271da177e4SLinus Torvalds goto fail; 18281da177e4SLinus Torvalds } 18291da177e4SLinus Torvalds 18301da177e4SLinus Torvalds /* Also, add the destination address. */ 18311da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1832f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1833f57d96b2SVlad Yasevich SCTP_ADDR_SRC, GFP_ATOMIC); 18341da177e4SLinus Torvalds } 18351da177e4SLinus Torvalds 18361da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 18371da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 18381da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 18391da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 18401da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 18410f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 18421da177e4SLinus Torvalds 18431da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 18441da177e4SLinus Torvalds return retval; 18451da177e4SLinus Torvalds 18461da177e4SLinus Torvalds fail: 18471da177e4SLinus Torvalds if (retval) 18481da177e4SLinus Torvalds sctp_association_free(retval); 18491da177e4SLinus Torvalds 18501da177e4SLinus Torvalds return NULL; 18511da177e4SLinus Torvalds 18521da177e4SLinus Torvalds malformed: 18531da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 18541da177e4SLinus Torvalds * malformed. 18551da177e4SLinus Torvalds */ 18561da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 18571da177e4SLinus Torvalds goto fail; 18581da177e4SLinus Torvalds } 18591da177e4SLinus Torvalds 18601da177e4SLinus Torvalds /******************************************************************** 18611da177e4SLinus Torvalds * 3rd Level Abstractions 18621da177e4SLinus Torvalds ********************************************************************/ 18631da177e4SLinus Torvalds 18641da177e4SLinus Torvalds struct __sctp_missing { 18659f81bcd9SAl Viro __be32 num_missing; 18669f81bcd9SAl Viro __be16 type; 1867bc10502dSEric Dumazet } __packed; 18681da177e4SLinus Torvalds 18691da177e4SLinus Torvalds /* 18701da177e4SLinus Torvalds * Report a missing mandatory parameter. 18711da177e4SLinus Torvalds */ 18721da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 18731da177e4SLinus Torvalds sctp_param_t paramtype, 18741da177e4SLinus Torvalds struct sctp_chunk *chunk, 18751da177e4SLinus Torvalds struct sctp_chunk **errp) 18761da177e4SLinus Torvalds { 18771da177e4SLinus Torvalds struct __sctp_missing report; 18781da177e4SLinus Torvalds __u16 len; 18791da177e4SLinus Torvalds 18801da177e4SLinus Torvalds len = WORD_ROUND(sizeof(report)); 18811da177e4SLinus Torvalds 18821da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 18831da177e4SLinus Torvalds * returning multiple unknown parameters. 18841da177e4SLinus Torvalds */ 18851da177e4SLinus Torvalds if (!*errp) 18861da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18871da177e4SLinus Torvalds 18881da177e4SLinus Torvalds if (*errp) { 18891da177e4SLinus Torvalds report.num_missing = htonl(1); 18901da177e4SLinus Torvalds report.type = paramtype; 1891ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 189200f1c2dfSWei Yongjun sizeof(report)); 189300f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 18941da177e4SLinus Torvalds } 18951da177e4SLinus Torvalds 18961da177e4SLinus Torvalds /* Stop processing this chunk. */ 18971da177e4SLinus Torvalds return 0; 18981da177e4SLinus Torvalds } 18991da177e4SLinus Torvalds 19001da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 19011da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 19021da177e4SLinus Torvalds struct sctp_chunk *chunk, 19031da177e4SLinus Torvalds struct sctp_chunk **errp) 19041da177e4SLinus Torvalds { 19051da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 19061da177e4SLinus Torvalds 19071da177e4SLinus Torvalds if (!*errp) 19081da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 19091da177e4SLinus Torvalds 19101da177e4SLinus Torvalds if (*errp) 191100f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 19121da177e4SLinus Torvalds 19131da177e4SLinus Torvalds /* Stop processing this chunk. */ 19141da177e4SLinus Torvalds return 0; 19151da177e4SLinus Torvalds } 19161da177e4SLinus Torvalds 19171da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 19181da177e4SLinus Torvalds struct sctp_paramhdr *param, 19191da177e4SLinus Torvalds const struct sctp_chunk *chunk, 19201da177e4SLinus Torvalds struct sctp_chunk **errp) 19211da177e4SLinus Torvalds { 19227ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 19237ab90804SVlad Yasevich * not reported. 19247ab90804SVlad Yasevich */ 19257ab90804SVlad Yasevich if (*errp) 19267ab90804SVlad Yasevich sctp_chunk_free(*errp); 19277ab90804SVlad Yasevich 19281da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1929ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 19301da177e4SLinus Torvalds 19311da177e4SLinus Torvalds return 0; 19321da177e4SLinus Torvalds } 19331da177e4SLinus Torvalds 19341da177e4SLinus Torvalds 19351da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 19361da177e4SLinus Torvalds * send back an indicator to the peer. 19371da177e4SLinus Torvalds */ 19381da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 19391da177e4SLinus Torvalds union sctp_params param, 19401da177e4SLinus Torvalds struct sctp_chunk *chunk, 19411da177e4SLinus Torvalds struct sctp_chunk **errp) 19421da177e4SLinus Torvalds { 19431da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 19441da177e4SLinus Torvalds 19457ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 19467ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 19477ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 19487ab90804SVlad Yasevich * them in the ABORT. 19497ab90804SVlad Yasevich */ 19507ab90804SVlad Yasevich if (*errp) 19517ab90804SVlad Yasevich sctp_chunk_free(*errp); 19527ab90804SVlad Yasevich 19531da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19541da177e4SLinus Torvalds 195500f1c2dfSWei Yongjun if (*errp) { 195600f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); 195700f1c2dfSWei Yongjun sctp_addto_chunk(*errp, len, param.v); 195800f1c2dfSWei Yongjun } 19591da177e4SLinus Torvalds 19601da177e4SLinus Torvalds /* Stop processing this chunk. */ 19611da177e4SLinus Torvalds return 0; 19621da177e4SLinus Torvalds } 19631da177e4SLinus Torvalds 1964f53b5b09SEric W. Biederman static int sctp_verify_ext_param(struct net *net, union sctp_params param) 1965d6701191SVlad Yasevich { 1966d6701191SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 1967d6701191SVlad Yasevich int have_auth = 0; 1968d6701191SVlad Yasevich int have_asconf = 0; 1969d6701191SVlad Yasevich int i; 1970d6701191SVlad Yasevich 1971d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 1972d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 1973d6701191SVlad Yasevich case SCTP_CID_AUTH: 1974d6701191SVlad Yasevich have_auth = 1; 1975d6701191SVlad Yasevich break; 1976d6701191SVlad Yasevich case SCTP_CID_ASCONF: 1977d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 1978d6701191SVlad Yasevich have_asconf = 1; 1979d6701191SVlad Yasevich break; 1980d6701191SVlad Yasevich } 1981d6701191SVlad Yasevich } 1982d6701191SVlad Yasevich 1983d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 1984d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 1985d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 1986d6701191SVlad Yasevich * mode. 1987d6701191SVlad Yasevich */ 1988e1fc3b14SEric W. Biederman if (net->sctp.addip_noauth) 1989d6701191SVlad Yasevich return 1; 1990d6701191SVlad Yasevich 1991e1fc3b14SEric W. Biederman if (net->sctp.addip_enable && !have_auth && have_asconf) 1992d6701191SVlad Yasevich return 0; 1993d6701191SVlad Yasevich 1994d6701191SVlad Yasevich return 1; 1995d6701191SVlad Yasevich } 1996d6701191SVlad Yasevich 1997131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 1998131a47e3SVlad Yasevich union sctp_params param) 1999131a47e3SVlad Yasevich { 2000e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 2001131a47e3SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 2002131a47e3SVlad Yasevich int i; 2003131a47e3SVlad Yasevich 2004131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 2005131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 2006131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 2007f7010e61Swangweidong if (net->sctp.prsctp_enable && !asoc->peer.prsctp_capable) 2008131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 2009131a47e3SVlad Yasevich break; 2010730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 2011730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 2012730fc3d0SVlad Yasevich * supports AUTH. 2013730fc3d0SVlad Yasevich */ 2014b14878ccSVlad Yasevich if (asoc->ep->auth_enable) 2015730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 2016730fc3d0SVlad Yasevich break; 2017131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 2018131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 2019e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 202088799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 20216b2f9cb6SVlad Yasevich break; 2022131a47e3SVlad Yasevich default: 2023131a47e3SVlad Yasevich break; 2024131a47e3SVlad Yasevich } 2025131a47e3SVlad Yasevich } 2026131a47e3SVlad Yasevich } 2027131a47e3SVlad Yasevich 20281da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 20291da177e4SLinus Torvalds * 20301da177e4SLinus Torvalds * The Parameter Types are encoded such that the 20311da177e4SLinus Torvalds * highest-order two bits specify the action that must be 20321da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 20331da177e4SLinus Torvalds * Parameter Type. 20341da177e4SLinus Torvalds * 20357ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 20367ab90804SVlad Yasevich * parameters within this chunk 20371da177e4SLinus Torvalds * 20387ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 20397ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 20407ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 20411da177e4SLinus Torvalds * 20421da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 20431da177e4SLinus Torvalds * 20441da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 20451da177e4SLinus Torvalds * report the unrecognized parameter in an 20467ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 20471da177e4SLinus Torvalds * 20481da177e4SLinus Torvalds * Return value: 20497ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20507ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 20517ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 20521da177e4SLinus Torvalds */ 20537ab90804SVlad Yasevich static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc, 20541da177e4SLinus Torvalds union sctp_params param, 20551da177e4SLinus Torvalds struct sctp_chunk *chunk, 20561da177e4SLinus Torvalds struct sctp_chunk **errp) 20571da177e4SLinus Torvalds { 20587ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 20591da177e4SLinus Torvalds 20601da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 20611da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 20627ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20631da177e4SLinus Torvalds break; 20641da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 20651da177e4SLinus Torvalds break; 20667ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 20677ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20687ab90804SVlad Yasevich /* Fall through */ 20691da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 20701da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 20711da177e4SLinus Torvalds * returning multiple unknown parameters. 20721da177e4SLinus Torvalds */ 20731da177e4SLinus Torvalds if (NULL == *errp) 20745fa782c2SNeil Horman *errp = sctp_make_op_error_fixed(asoc, chunk); 20751da177e4SLinus Torvalds 20761da177e4SLinus Torvalds if (*errp) { 20772205a6eaSJiri Bohac if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM, 20782205a6eaSJiri Bohac WORD_ROUND(ntohs(param.p->length)))) 20795fa782c2SNeil Horman sctp_addto_chunk_fixed(*errp, 208000f1c2dfSWei Yongjun WORD_ROUND(ntohs(param.p->length)), 208100f1c2dfSWei Yongjun param.v); 20821da177e4SLinus Torvalds } else { 20831da177e4SLinus Torvalds /* If there is no memory for generating the ERROR 20841da177e4SLinus Torvalds * report as specified, an ABORT will be triggered 20851da177e4SLinus Torvalds * to the peer and the association won't be 20861da177e4SLinus Torvalds * established. 20871da177e4SLinus Torvalds */ 20887ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 20891da177e4SLinus Torvalds } 20901da177e4SLinus Torvalds break; 20911da177e4SLinus Torvalds default: 20921da177e4SLinus Torvalds break; 20931da177e4SLinus Torvalds } 20941da177e4SLinus Torvalds 20951da177e4SLinus Torvalds return retval; 20961da177e4SLinus Torvalds } 20971da177e4SLinus Torvalds 20987ab90804SVlad Yasevich /* Verify variable length parameters 20991da177e4SLinus Torvalds * Return values: 21007ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 21017ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 21027ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 21037ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 21041da177e4SLinus Torvalds */ 2105f53b5b09SEric W. Biederman static sctp_ierror_t sctp_verify_param(struct net *net, 2106b14878ccSVlad Yasevich const struct sctp_endpoint *ep, 2107f53b5b09SEric W. Biederman const struct sctp_association *asoc, 21081da177e4SLinus Torvalds union sctp_params param, 21091da177e4SLinus Torvalds sctp_cid_t cid, 21101da177e4SLinus Torvalds struct sctp_chunk *chunk, 21111da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 21121da177e4SLinus Torvalds { 211372da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 21147ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 211572da7b38SWei Yongjun __u16 n_elt, id = 0; 211672da7b38SWei Yongjun int i; 21171da177e4SLinus Torvalds 21181da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 21191da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 21201da177e4SLinus Torvalds * identified based on the chunk id. 21211da177e4SLinus Torvalds */ 21221da177e4SLinus Torvalds 21231da177e4SLinus Torvalds switch (param.p->type) { 21241da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 21251da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 21261da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 21271da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 21281da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 21291da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 21301da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 21311da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 21320f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2133d6701191SVlad Yasevich break; 2134d6701191SVlad Yasevich 2135131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2136f53b5b09SEric W. Biederman if (!sctp_verify_ext_param(net, param)) 2137d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 21381da177e4SLinus Torvalds break; 21391da177e4SLinus Torvalds 2140d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2141e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 2142d6de3097SVlad Yasevich break; 2143d6de3097SVlad Yasevich goto fallthrough; 2144d6de3097SVlad Yasevich 21451da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 21461da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 21477ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 21487ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21497ab90804SVlad Yasevich break; 2150131a47e3SVlad Yasevich 21511da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 2152e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable) 21531da177e4SLinus Torvalds break; 2154730fc3d0SVlad Yasevich goto fallthrough; 2155730fc3d0SVlad Yasevich 2156730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2157b14878ccSVlad Yasevich if (!ep->auth_enable) 2158730fc3d0SVlad Yasevich goto fallthrough; 2159730fc3d0SVlad Yasevich 2160730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2161730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2162730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2163730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2164730fc3d0SVlad Yasevich */ 2165730fc3d0SVlad Yasevich if (SCTP_AUTH_RANDOM_LENGTH != 21667ab90804SVlad Yasevich ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) { 21677ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2168730fc3d0SVlad Yasevich chunk, err_chunk); 21697ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21707ab90804SVlad Yasevich } 2171730fc3d0SVlad Yasevich break; 2172730fc3d0SVlad Yasevich 2173730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2174b14878ccSVlad Yasevich if (!ep->auth_enable) 2175730fc3d0SVlad Yasevich goto fallthrough; 2176730fc3d0SVlad Yasevich 2177730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2178730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2179730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2180730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2181730fc3d0SVlad Yasevich */ 21827ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 21837ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2184730fc3d0SVlad Yasevich chunk, err_chunk); 21857ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21867ab90804SVlad Yasevich } 2187730fc3d0SVlad Yasevich break; 2188730fc3d0SVlad Yasevich 2189730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2190b14878ccSVlad Yasevich if (!ep->auth_enable) 219172da7b38SWei Yongjun goto fallthrough; 219272da7b38SWei Yongjun 219372da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 219472da7b38SWei Yongjun n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1; 219572da7b38SWei Yongjun 219672da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 219772da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 219872da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 219972da7b38SWei Yongjun */ 220072da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 220172da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 220272da7b38SWei Yongjun 220372da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2204730fc3d0SVlad Yasevich break; 220572da7b38SWei Yongjun } 220672da7b38SWei Yongjun 220772da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 220872da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 220972da7b38SWei Yongjun err_chunk); 221072da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 221172da7b38SWei Yongjun } 221272da7b38SWei Yongjun break; 2213730fc3d0SVlad Yasevich fallthrough: 22141da177e4SLinus Torvalds default: 2215bb33381dSDaniel Borkmann pr_debug("%s: unrecognized param:%d for chunk:%d\n", 2216bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), cid); 2217bb33381dSDaniel Borkmann 22187ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 22191da177e4SLinus Torvalds break; 22201da177e4SLinus Torvalds } 22211da177e4SLinus Torvalds return retval; 22221da177e4SLinus Torvalds } 22231da177e4SLinus Torvalds 22241da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 2225b14878ccSVlad Yasevich int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 2226b14878ccSVlad Yasevich const struct sctp_association *asoc, sctp_cid_t cid, 2227b14878ccSVlad Yasevich sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, 22281da177e4SLinus Torvalds struct sctp_chunk **errp) 22291da177e4SLinus Torvalds { 22301da177e4SLinus Torvalds union sctp_params param; 22317613f5feSDaniel Borkmann bool has_cookie = false; 22327ab90804SVlad Yasevich int result; 22331da177e4SLinus Torvalds 22347613f5feSDaniel Borkmann /* Check for missing mandatory parameters. Note: Initial TSN is 22357613f5feSDaniel Borkmann * also mandatory, but is not checked here since the valid range 22367613f5feSDaniel Borkmann * is 0..2**32-1. RFC4960, section 3.3.3. 22377613f5feSDaniel Borkmann */ 22387613f5feSDaniel Borkmann if (peer_init->init_hdr.num_outbound_streams == 0 || 22397613f5feSDaniel Borkmann peer_init->init_hdr.num_inbound_streams == 0 || 22407613f5feSDaniel Borkmann peer_init->init_hdr.init_tag == 0 || 22417613f5feSDaniel Borkmann ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) 22427ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 22431da177e4SLinus Torvalds 22441da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22457613f5feSDaniel Borkmann if (param.p->type == SCTP_PARAM_STATE_COOKIE) 22467613f5feSDaniel Borkmann has_cookie = true; 22477613f5feSDaniel Borkmann } 22481da177e4SLinus Torvalds 22491da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 22501da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 22511da177e4SLinus Torvalds * The current param.p would point at the bad one. 22521da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 22531da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 22541da177e4SLinus Torvalds * error handling code build and send the packet. 22551da177e4SLinus Torvalds */ 22567ab90804SVlad Yasevich if (param.v != (void *)chunk->chunk_end) 22577ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 22581da177e4SLinus Torvalds 22591da177e4SLinus Torvalds /* The only missing mandatory param possible today is 22601da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 22611da177e4SLinus Torvalds */ 22627ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 22637ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 22641da177e4SLinus Torvalds chunk, errp); 22651da177e4SLinus Torvalds 22667ab90804SVlad Yasevich /* Verify all the variable length parameters */ 22671da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2268b14878ccSVlad Yasevich result = sctp_verify_param(net, ep, asoc, param, cid, 2269b14878ccSVlad Yasevich chunk, errp); 22707ab90804SVlad Yasevich switch (result) { 22717ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 22727ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 22731da177e4SLinus Torvalds return 0; 22747ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 22751da177e4SLinus Torvalds return 1; 22767ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 22777ab90804SVlad Yasevich default: 22787ab90804SVlad Yasevich break; 22791da177e4SLinus Torvalds } 22801da177e4SLinus Torvalds 22811da177e4SLinus Torvalds } /* for (loop through all parameters) */ 22821da177e4SLinus Torvalds 22831da177e4SLinus Torvalds return 1; 22841da177e4SLinus Torvalds } 22851da177e4SLinus Torvalds 22861da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 22871da177e4SLinus Torvalds * Returns 0 on failure, else success. 22881da177e4SLinus Torvalds * FIXME: This is an association method. 22891da177e4SLinus Torvalds */ 2290de6becdcSWei Yongjun int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, 22911da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2292dd0fc66fSAl Viro sctp_init_chunk_t *peer_init, gfp_t gfp) 22931da177e4SLinus Torvalds { 2294e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 22951da177e4SLinus Torvalds union sctp_params param; 22961da177e4SLinus Torvalds struct sctp_transport *transport; 22971da177e4SLinus Torvalds struct list_head *pos, *temp; 2298de6becdcSWei Yongjun struct sctp_af *af; 2299de6becdcSWei Yongjun union sctp_addr addr; 23001da177e4SLinus Torvalds char *cookie; 2301de6becdcSWei Yongjun int src_match = 0; 23021da177e4SLinus Torvalds 23031da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 23041da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 23051da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 23061da177e4SLinus Torvalds * of the INIT from the cookie. 23071da177e4SLinus Torvalds */ 23081da177e4SLinus Torvalds 23091da177e4SLinus Torvalds /* This implementation defaults to making the first transport 23101da177e4SLinus Torvalds * added as the primary transport. The source address seems to 23111da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 23121da177e4SLinus Torvalds */ 23136a1e5f33SAl Viro if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 23141da177e4SLinus Torvalds goto nomem; 2315de6becdcSWei Yongjun 2316de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) 2317de6becdcSWei Yongjun src_match = 1; 23181da177e4SLinus Torvalds 23191da177e4SLinus Torvalds /* Process the initialization parameters. */ 23201da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2321de6becdcSWei Yongjun if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 2322de6becdcSWei Yongjun param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { 2323de6becdcSWei Yongjun af = sctp_get_af_specific(param_type2af(param.p->type)); 2324de6becdcSWei Yongjun af->from_addr_param(&addr, param.addr, 2325de6becdcSWei Yongjun chunk->sctp_hdr->source, 0); 2326de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) 2327de6becdcSWei Yongjun src_match = 1; 2328de6becdcSWei Yongjun } 23291da177e4SLinus Torvalds 23301da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 23311da177e4SLinus Torvalds goto clean_up; 23321da177e4SLinus Torvalds } 23331da177e4SLinus Torvalds 2334de6becdcSWei Yongjun /* source address of chunk may not match any valid address */ 2335de6becdcSWei Yongjun if (!src_match) 2336de6becdcSWei Yongjun goto clean_up; 2337de6becdcSWei Yongjun 2338730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2339730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2340730fc3d0SVlad Yasevich */ 2341730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2342730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2343730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2344730fc3d0SVlad Yasevich 2345d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2346d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2347d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2348d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2349d6701191SVlad Yasevich * is what we'll do here. 23506b2f9cb6SVlad Yasevich */ 2351e1fc3b14SEric W. Biederman if (!net->sctp.addip_noauth && 235273d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 23536b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 23546b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 23556b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 235688799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2357d6701191SVlad Yasevich goto clean_up; 23586b2f9cb6SVlad Yasevich } 23596b2f9cb6SVlad Yasevich 23603f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 23613f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 23623f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 23633f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 23643f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 23653f7a87d2SFrank Filz } 23663f7a87d2SFrank Filz } 23673f7a87d2SFrank Filz 23681da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 23691da177e4SLinus Torvalds * order. 23701da177e4SLinus Torvalds */ 23711da177e4SLinus Torvalds asoc->peer.i.init_tag = 23721da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 23731da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 23741da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 23751da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 23761da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 23771da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 23781da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 23791da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 23801da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 23811da177e4SLinus Torvalds 23821da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 23831da177e4SLinus Torvalds * number of inbound streams. 23841da177e4SLinus Torvalds */ 23851da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 23861da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 23871da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 23881da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 23891da177e4SLinus Torvalds } 23901da177e4SLinus Torvalds 23911da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 23921da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 23931da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 23941da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 23951da177e4SLinus Torvalds } 23961da177e4SLinus Torvalds 23971da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 23981da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 23991da177e4SLinus Torvalds 24001da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 24011da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 24021da177e4SLinus Torvalds 24031da177e4SLinus Torvalds /* Copy cookie in case we need to resend COOKIE-ECHO. */ 24041da177e4SLinus Torvalds cookie = asoc->peer.cookie; 24051da177e4SLinus Torvalds if (cookie) { 2406af997d8cSArnaldo Carvalho de Melo asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); 24071da177e4SLinus Torvalds if (!asoc->peer.cookie) 24081da177e4SLinus Torvalds goto clean_up; 24091da177e4SLinus Torvalds } 24101da177e4SLinus Torvalds 24111da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 24121da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 24131da177e4SLinus Torvalds * advertised window). 24141da177e4SLinus Torvalds */ 24159dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 24169dbc15f0SRobert P. J. Day transports) { 24171da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 24181da177e4SLinus Torvalds } 24191da177e4SLinus Torvalds 24201da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 24218e1ee18cSVlad Yasevich if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 24228e1ee18cSVlad Yasevich asoc->peer.i.initial_tsn, gfp)) 24238e1ee18cSVlad Yasevich goto clean_up; 24241da177e4SLinus Torvalds 24251da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 24261da177e4SLinus Torvalds * 24271da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 24281da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 24291da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 24301da177e4SLinus Torvalds * stream sequence number shall be set to 0. 24311da177e4SLinus Torvalds */ 24321da177e4SLinus Torvalds 24333f7a87d2SFrank Filz /* Allocate storage for the negotiated streams if it is not a temporary 24343f7a87d2SFrank Filz * association. 24351da177e4SLinus Torvalds */ 24361da177e4SLinus Torvalds if (!asoc->temp) { 24371da177e4SLinus Torvalds int error; 24381da177e4SLinus Torvalds 24391da177e4SLinus Torvalds asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, 24401da177e4SLinus Torvalds asoc->c.sinit_num_ostreams, gfp); 24411da177e4SLinus Torvalds if (!asoc->ssnmap) 24421da177e4SLinus Torvalds goto clean_up; 24431da177e4SLinus Torvalds 244407d93967SVlad Yasevich error = sctp_assoc_set_id(asoc, gfp); 244507d93967SVlad Yasevich if (error) 24461da177e4SLinus Torvalds goto clean_up; 24471da177e4SLinus Torvalds } 24481da177e4SLinus Torvalds 24491da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 24501da177e4SLinus Torvalds * 24511da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 24521da177e4SLinus Torvalds * remote endpoint it should do the following: 24531da177e4SLinus Torvalds * ... 24541da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 24551da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 24561da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 24571da177e4SLinus Torvalds * association to the same value as the Initial TSN. 24581da177e4SLinus Torvalds */ 24591da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 24601da177e4SLinus Torvalds return 1; 24611da177e4SLinus Torvalds 24621da177e4SLinus Torvalds clean_up: 24631da177e4SLinus Torvalds /* Release the transport structures. */ 24641da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 24651da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2466add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2467add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 24681da177e4SLinus Torvalds } 24693f7a87d2SFrank Filz 24701da177e4SLinus Torvalds nomem: 24711da177e4SLinus Torvalds return 0; 24721da177e4SLinus Torvalds } 24731da177e4SLinus Torvalds 24741da177e4SLinus Torvalds 24751da177e4SLinus Torvalds /* Update asoc with the option described in param. 24761da177e4SLinus Torvalds * 24771da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 24781da177e4SLinus Torvalds * 24791da177e4SLinus Torvalds * asoc is the association to update. 24801da177e4SLinus Torvalds * param is the variable length parameter to use for update. 24811da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 24821da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 24831da177e4SLinus Torvalds * work we do. In particular, we should not build transport 24841da177e4SLinus Torvalds * structures for the addresses. 24851da177e4SLinus Torvalds */ 24861da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 24871da177e4SLinus Torvalds union sctp_params param, 24881da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2489dd0fc66fSAl Viro gfp_t gfp) 24901da177e4SLinus Torvalds { 2491e7ff4a70SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 24921da177e4SLinus Torvalds union sctp_addr addr; 24931da177e4SLinus Torvalds int i; 24941da177e4SLinus Torvalds __u16 sat; 24951da177e4SLinus Torvalds int retval = 1; 24961da177e4SLinus Torvalds sctp_scope_t scope; 24971da177e4SLinus Torvalds time_t stale; 24981da177e4SLinus Torvalds struct sctp_af *af; 2499d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 2500d6de3097SVlad Yasevich struct sctp_transport *t; 2501b14878ccSVlad Yasevich struct sctp_endpoint *ep = asoc->ep; 25021da177e4SLinus Torvalds 25031da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 25041da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 25051da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 25061da177e4SLinus Torvalds */ 25071da177e4SLinus Torvalds switch (param.p->type) { 25081da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25091da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 25101da177e4SLinus Torvalds break; 25117dab83deSVlad Yasevich goto do_addr_param; 25127dab83deSVlad Yasevich 25131da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25147dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 25157dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 25167dab83deSVlad Yasevich break; 25177dab83deSVlad Yasevich do_addr_param: 25181da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2519dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 25201da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2521e7ff4a70SEric W. Biederman if (sctp_in_scope(net, &addr, scope)) 2522dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 25231da177e4SLinus Torvalds return 0; 25241da177e4SLinus Torvalds break; 25251da177e4SLinus Torvalds 25261da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 2527e1fc3b14SEric W. Biederman if (!net->sctp.cookie_preserve_enable) 25281da177e4SLinus Torvalds break; 25291da177e4SLinus Torvalds 25301da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 25311da177e4SLinus Torvalds 25321da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 25331da177e4SLinus Torvalds * (1/1000sec). 25341da177e4SLinus Torvalds */ 253552db882fSDaniel Borkmann asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); 25361da177e4SLinus Torvalds break; 25371da177e4SLinus Torvalds 25381da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 2539bb33381dSDaniel Borkmann pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); 25401da177e4SLinus Torvalds break; 25411da177e4SLinus Torvalds 25421da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 25431da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 25441da177e4SLinus Torvalds * ones are really set by the peer. 25451da177e4SLinus Torvalds */ 25461da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 25471da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 25481da177e4SLinus Torvalds 2549140ee960SGui Jianfeng /* Assume that peer supports the address family 2550140ee960SGui Jianfeng * by which it sends a packet. 2551140ee960SGui Jianfeng */ 2552140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2553140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2554140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2555140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2556140ee960SGui Jianfeng 25571da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 25581da177e4SLinus Torvalds sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 25591da177e4SLinus Torvalds if (sat) 25601da177e4SLinus Torvalds sat /= sizeof(__u16); 25611da177e4SLinus Torvalds 25621da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 25631da177e4SLinus Torvalds switch (param.sat->types[i]) { 25641da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25651da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 25661da177e4SLinus Torvalds break; 25671da177e4SLinus Torvalds 25681da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25696e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 25701da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 25711da177e4SLinus Torvalds break; 25721da177e4SLinus Torvalds 25731da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 25741da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 25751da177e4SLinus Torvalds break; 25761da177e4SLinus Torvalds 25771da177e4SLinus Torvalds default: /* Just ignore anything else. */ 25781da177e4SLinus Torvalds break; 25793ff50b79SStephen Hemminger } 25801da177e4SLinus Torvalds } 25811da177e4SLinus Torvalds break; 25821da177e4SLinus Torvalds 25831da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 25841da177e4SLinus Torvalds asoc->peer.cookie_len = 25851da177e4SLinus Torvalds ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 25861da177e4SLinus Torvalds asoc->peer.cookie = param.cookie->body; 25871da177e4SLinus Torvalds break; 25881da177e4SLinus Torvalds 25891da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 25901da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 25911da177e4SLinus Torvalds break; 25921da177e4SLinus Torvalds 25931da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 25941da177e4SLinus Torvalds /* Rejected during verify stage. */ 25951da177e4SLinus Torvalds break; 25961da177e4SLinus Torvalds 25971da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 25981da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 25991da177e4SLinus Torvalds break; 26001da177e4SLinus Torvalds 26010f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2602e69c4e0fSVlad Yasevich asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); 26031da177e4SLinus Torvalds break; 26041da177e4SLinus Torvalds 2605d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2606e1fc3b14SEric W. Biederman if (!net->sctp.addip_enable) 26070ef46e28SVlad Yasevich goto fall_through; 26080ef46e28SVlad Yasevich 2609d6de3097SVlad Yasevich addr_param = param.v + sizeof(sctp_addip_param_t); 2610d6de3097SVlad Yasevich 2611d6de3097SVlad Yasevich af = sctp_get_af_specific(param_type2af(param.p->type)); 2612d6de3097SVlad Yasevich af->from_addr_param(&addr, addr_param, 2613d6de3097SVlad Yasevich htons(asoc->peer.port), 0); 2614d6de3097SVlad Yasevich 2615d6de3097SVlad Yasevich /* if the address is invalid, we can't process it. 2616d6de3097SVlad Yasevich * XXX: see spec for what to do. 2617d6de3097SVlad Yasevich */ 2618d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2619d6de3097SVlad Yasevich break; 2620d6de3097SVlad Yasevich 2621d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2622d6de3097SVlad Yasevich if (!t) 2623d6de3097SVlad Yasevich break; 2624d6de3097SVlad Yasevich 2625d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2626d6de3097SVlad Yasevich break; 2627d6de3097SVlad Yasevich 2628131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2629131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2630131a47e3SVlad Yasevich break; 2631131a47e3SVlad Yasevich 26321da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 2633e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable) { 26341da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 26351da177e4SLinus Torvalds break; 26361da177e4SLinus Torvalds } 26371da177e4SLinus Torvalds /* Fall Through */ 2638730fc3d0SVlad Yasevich goto fall_through; 2639730fc3d0SVlad Yasevich 2640730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2641b14878ccSVlad Yasevich if (!ep->auth_enable) 2642730fc3d0SVlad Yasevich goto fall_through; 2643730fc3d0SVlad Yasevich 2644730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2645730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2646730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2647730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2648730fc3d0SVlad Yasevich retval = 0; 2649730fc3d0SVlad Yasevich break; 2650730fc3d0SVlad Yasevich } 2651730fc3d0SVlad Yasevich break; 2652730fc3d0SVlad Yasevich 2653730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2654b14878ccSVlad Yasevich if (!ep->auth_enable) 2655730fc3d0SVlad Yasevich goto fall_through; 2656730fc3d0SVlad Yasevich 2657730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2658730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2659730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2660730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2661730fc3d0SVlad Yasevich retval = 0; 2662730fc3d0SVlad Yasevich break; 2663730fc3d0SVlad Yasevich } 2664730fc3d0SVlad Yasevich 2665730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2666730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2667730fc3d0SVlad Yasevich break; 2668730fc3d0SVlad Yasevich 2669730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2670b14878ccSVlad Yasevich if (!ep->auth_enable) 2671730fc3d0SVlad Yasevich goto fall_through; 2672730fc3d0SVlad Yasevich 2673730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2674730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2675730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2676730fc3d0SVlad Yasevich retval = 0; 2677730fc3d0SVlad Yasevich break; 2678730fc3d0SVlad Yasevich fall_through: 26791da177e4SLinus Torvalds default: 26801da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 26811da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 26821da177e4SLinus Torvalds * called prior to this routine. Simply log the error 26831da177e4SLinus Torvalds * here. 26841da177e4SLinus Torvalds */ 2685bb33381dSDaniel Borkmann pr_debug("%s: ignoring param:%d for association:%p.\n", 2686bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), asoc); 26871da177e4SLinus Torvalds break; 26883ff50b79SStephen Hemminger } 26891da177e4SLinus Torvalds 26901da177e4SLinus Torvalds return retval; 26911da177e4SLinus Torvalds } 26921da177e4SLinus Torvalds 26931da177e4SLinus Torvalds /* Select a new verification tag. */ 26941da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 26951da177e4SLinus Torvalds { 26961da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 26971da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 26981da177e4SLinus Torvalds */ 26991da177e4SLinus Torvalds __u32 x; 27001da177e4SLinus Torvalds 27011da177e4SLinus Torvalds do { 27021da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 27031da177e4SLinus Torvalds } while (x == 0); 27041da177e4SLinus Torvalds 27051da177e4SLinus Torvalds return x; 27061da177e4SLinus Torvalds } 27071da177e4SLinus Torvalds 27081da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 27091da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 27101da177e4SLinus Torvalds { 27111da177e4SLinus Torvalds __u32 retval; 27121da177e4SLinus Torvalds 27131da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 27141da177e4SLinus Torvalds return retval; 27151da177e4SLinus Torvalds } 27161da177e4SLinus Torvalds 27171da177e4SLinus Torvalds /* 27181da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 27191da177e4SLinus Torvalds * 0 1 2 3 27201da177e4SLinus 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 27211da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27221da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 27231da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27241da177e4SLinus Torvalds * | Serial Number | 27251da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27261da177e4SLinus Torvalds * | Address Parameter | 27271da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27281da177e4SLinus Torvalds * | ASCONF Parameter #1 | 27291da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27301da177e4SLinus Torvalds * \ \ 27311da177e4SLinus Torvalds * / .... / 27321da177e4SLinus Torvalds * \ \ 27331da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27341da177e4SLinus Torvalds * | ASCONF Parameter #N | 27351da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27361da177e4SLinus Torvalds * 27371da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 27381da177e4SLinus Torvalds */ 27391da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 27401da177e4SLinus Torvalds union sctp_addr *addr, 27411da177e4SLinus Torvalds int vparam_len) 27421da177e4SLinus Torvalds { 27431da177e4SLinus Torvalds sctp_addiphdr_t asconf; 27441da177e4SLinus Torvalds struct sctp_chunk *retval; 27451da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 27461da177e4SLinus Torvalds union sctp_addr_param addrparam; 27471da177e4SLinus Torvalds int addrlen; 27481da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 27491da177e4SLinus Torvalds 27501da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 27511da177e4SLinus Torvalds if (!addrlen) 27521da177e4SLinus Torvalds return NULL; 27531da177e4SLinus Torvalds length += addrlen; 27541da177e4SLinus Torvalds 27551da177e4SLinus Torvalds /* Create the chunk. */ 2756072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length); 27571da177e4SLinus Torvalds if (!retval) 27581da177e4SLinus Torvalds return NULL; 27591da177e4SLinus Torvalds 27601da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 27611da177e4SLinus Torvalds 27621da177e4SLinus Torvalds retval->subh.addip_hdr = 27631da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 27641da177e4SLinus Torvalds retval->param_hdr.v = 27651da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 27661da177e4SLinus Torvalds 27671da177e4SLinus Torvalds return retval; 27681da177e4SLinus Torvalds } 27691da177e4SLinus Torvalds 27701da177e4SLinus Torvalds /* ADDIP 27711da177e4SLinus Torvalds * 3.2.1 Add IP Address 27721da177e4SLinus Torvalds * 0 1 2 3 27731da177e4SLinus 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 27741da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27751da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 27761da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27771da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27781da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27791da177e4SLinus Torvalds * | Address Parameter | 27801da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27811da177e4SLinus Torvalds * 27821da177e4SLinus Torvalds * 3.2.2 Delete IP Address 27831da177e4SLinus Torvalds * 0 1 2 3 27841da177e4SLinus 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 27851da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27861da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 27871da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27881da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27891da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27901da177e4SLinus Torvalds * | Address Parameter | 27911da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27921da177e4SLinus Torvalds * 27931da177e4SLinus Torvalds */ 27941da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 27951da177e4SLinus Torvalds union sctp_addr *laddr, 27961da177e4SLinus Torvalds struct sockaddr *addrs, 27971da177e4SLinus Torvalds int addrcnt, 2798dbc16db1SAl Viro __be16 flags) 27991da177e4SLinus Torvalds { 28001da177e4SLinus Torvalds sctp_addip_param_t param; 28011da177e4SLinus Torvalds struct sctp_chunk *retval; 28021da177e4SLinus Torvalds union sctp_addr_param addr_param; 28031da177e4SLinus Torvalds union sctp_addr *addr; 28041da177e4SLinus Torvalds void *addr_buf; 28051da177e4SLinus Torvalds struct sctp_af *af; 28061da177e4SLinus Torvalds int paramlen = sizeof(param); 28071da177e4SLinus Torvalds int addr_param_len = 0; 28081da177e4SLinus Torvalds int totallen = 0; 28091da177e4SLinus Torvalds int i; 28108a07eb0aSMichio Honda int del_pickup = 0; 28111da177e4SLinus Torvalds 28121da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 28131da177e4SLinus Torvalds addr_buf = addrs; 28141da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2815ea110733SJoe Perches addr = addr_buf; 28161da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28171da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28181da177e4SLinus Torvalds 28191da177e4SLinus Torvalds totallen += paramlen; 28201da177e4SLinus Torvalds totallen += addr_param_len; 28211da177e4SLinus Torvalds 28221da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28238a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending && !del_pickup) { 28248a07eb0aSMichio Honda /* reuse the parameter length from the same scope one */ 28258a07eb0aSMichio Honda totallen += paramlen; 28268a07eb0aSMichio Honda totallen += addr_param_len; 28278a07eb0aSMichio Honda del_pickup = 1; 2828bb33381dSDaniel Borkmann 2829bb33381dSDaniel Borkmann pr_debug("%s: picked same-scope del_pending addr, " 2830bb33381dSDaniel Borkmann "totallen for all addresses is %d\n", 2831bb33381dSDaniel Borkmann __func__, totallen); 28328a07eb0aSMichio Honda } 28331da177e4SLinus Torvalds } 28341da177e4SLinus Torvalds 28351da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 28361da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 28371da177e4SLinus Torvalds if (!retval) 28381da177e4SLinus Torvalds return NULL; 28391da177e4SLinus Torvalds 28401da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 28411da177e4SLinus Torvalds addr_buf = addrs; 28421da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2843ea110733SJoe Perches addr = addr_buf; 28441da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28451da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28461da177e4SLinus Torvalds param.param_hdr.type = flags; 28471da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 28481da177e4SLinus Torvalds param.crr_id = i; 28491da177e4SLinus Torvalds 28501da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 28511da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 28521da177e4SLinus Torvalds 28531da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28541da177e4SLinus Torvalds } 28558a07eb0aSMichio Honda if (flags == SCTP_PARAM_ADD_IP && del_pickup) { 28568a07eb0aSMichio Honda addr = asoc->asconf_addr_del_pending; 28578a07eb0aSMichio Honda af = sctp_get_af_specific(addr->v4.sin_family); 28588a07eb0aSMichio Honda addr_param_len = af->to_addr_param(addr, &addr_param); 28598a07eb0aSMichio Honda param.param_hdr.type = SCTP_PARAM_DEL_IP; 28608a07eb0aSMichio Honda param.param_hdr.length = htons(paramlen + addr_param_len); 28618a07eb0aSMichio Honda param.crr_id = i; 28628a07eb0aSMichio Honda 28638a07eb0aSMichio Honda sctp_addto_chunk(retval, paramlen, ¶m); 28648a07eb0aSMichio Honda sctp_addto_chunk(retval, addr_param_len, &addr_param); 28658a07eb0aSMichio Honda } 28661da177e4SLinus Torvalds return retval; 28671da177e4SLinus Torvalds } 28681da177e4SLinus Torvalds 28691da177e4SLinus Torvalds /* ADDIP 28701da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 28711da177e4SLinus Torvalds * 0 1 2 3 28721da177e4SLinus 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 28731da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28741da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 28751da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28761da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28771da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28781da177e4SLinus Torvalds * | Address Parameter | 28791da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28801da177e4SLinus Torvalds * 28811da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 28821da177e4SLinus Torvalds */ 28831da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 28841da177e4SLinus Torvalds union sctp_addr *addr) 28851da177e4SLinus Torvalds { 28861da177e4SLinus Torvalds sctp_addip_param_t param; 28871da177e4SLinus Torvalds struct sctp_chunk *retval; 28881da177e4SLinus Torvalds int len = sizeof(param); 28891da177e4SLinus Torvalds union sctp_addr_param addrparam; 28901da177e4SLinus Torvalds int addrlen; 28911da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 28921da177e4SLinus Torvalds 28931da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 28941da177e4SLinus Torvalds if (!addrlen) 28951da177e4SLinus Torvalds return NULL; 28961da177e4SLinus Torvalds len += addrlen; 28971da177e4SLinus Torvalds 28981da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 28991da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 29001da177e4SLinus Torvalds if (!retval) 29011da177e4SLinus Torvalds return NULL; 29021da177e4SLinus Torvalds 29031da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 29041da177e4SLinus Torvalds param.param_hdr.length = htons(len); 29051da177e4SLinus Torvalds param.crr_id = 0; 29061da177e4SLinus Torvalds 29071da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 29081da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 29091da177e4SLinus Torvalds 29101da177e4SLinus Torvalds return retval; 29111da177e4SLinus Torvalds } 29121da177e4SLinus Torvalds 29131da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 29141da177e4SLinus Torvalds * 0 1 2 3 29151da177e4SLinus 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 29161da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29171da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 29181da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29191da177e4SLinus Torvalds * | Serial Number | 29201da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29211da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 29221da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29231da177e4SLinus Torvalds * \ \ 29241da177e4SLinus Torvalds * / .... / 29251da177e4SLinus Torvalds * \ \ 29261da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29271da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 29281da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29291da177e4SLinus Torvalds * 29301da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 29311da177e4SLinus Torvalds */ 29321da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 29331da177e4SLinus Torvalds __u32 serial, int vparam_len) 29341da177e4SLinus Torvalds { 29351da177e4SLinus Torvalds sctp_addiphdr_t asconf; 29361da177e4SLinus Torvalds struct sctp_chunk *retval; 29371da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 29381da177e4SLinus Torvalds 29391da177e4SLinus Torvalds /* Create the chunk. */ 2940072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length); 29411da177e4SLinus Torvalds if (!retval) 29421da177e4SLinus Torvalds return NULL; 29431da177e4SLinus Torvalds 29441da177e4SLinus Torvalds asconf.serial = htonl(serial); 29451da177e4SLinus Torvalds 29461da177e4SLinus Torvalds retval->subh.addip_hdr = 29471da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 29481da177e4SLinus Torvalds 29491da177e4SLinus Torvalds return retval; 29501da177e4SLinus Torvalds } 29511da177e4SLinus Torvalds 29521da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 29539f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 2954dbc16db1SAl Viro __be16 err_code, sctp_addip_param_t *asconf_param) 29551da177e4SLinus Torvalds { 29561da177e4SLinus Torvalds sctp_addip_param_t ack_param; 29571da177e4SLinus Torvalds sctp_errhdr_t err_param; 29581da177e4SLinus Torvalds int asconf_param_len = 0; 29591da177e4SLinus Torvalds int err_param_len = 0; 2960dbc16db1SAl Viro __be16 response_type; 29611da177e4SLinus Torvalds 29621da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 29631da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 29641da177e4SLinus Torvalds } else { 29651da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 29661da177e4SLinus Torvalds err_param_len = sizeof(err_param); 29671da177e4SLinus Torvalds if (asconf_param) 29681da177e4SLinus Torvalds asconf_param_len = 29691da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 29701da177e4SLinus Torvalds } 29711da177e4SLinus Torvalds 29721da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 29731da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 29741da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 29751da177e4SLinus Torvalds err_param_len + 29761da177e4SLinus Torvalds asconf_param_len); 29771da177e4SLinus Torvalds ack_param.crr_id = crr_id; 29781da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 29791da177e4SLinus Torvalds 29801da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 29811da177e4SLinus Torvalds return; 29821da177e4SLinus Torvalds 29831da177e4SLinus Torvalds /* Add Error Cause parameter. */ 29841da177e4SLinus Torvalds err_param.cause = err_code; 29851da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 29861da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 29871da177e4SLinus Torvalds 29881da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 29891da177e4SLinus Torvalds if (asconf_param) 29901da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 29911da177e4SLinus Torvalds } 29921da177e4SLinus Torvalds 29931da177e4SLinus Torvalds /* Process a asconf parameter. */ 2994dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 29951da177e4SLinus Torvalds struct sctp_chunk *asconf, 29961da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 29971da177e4SLinus Torvalds { 29981da177e4SLinus Torvalds struct sctp_transport *peer; 29991da177e4SLinus Torvalds struct sctp_af *af; 30001da177e4SLinus Torvalds union sctp_addr addr; 30011da177e4SLinus Torvalds union sctp_addr_param *addr_param; 30021da177e4SLinus Torvalds 3003ea110733SJoe Perches addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); 3004c1cc678aSPatrick McHardy 300544e65c1eSWei Yongjun if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && 300644e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && 300744e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) 300844e65c1eSWei Yongjun return SCTP_ERROR_UNKNOWN_PARAM; 300944e65c1eSWei Yongjun 30106a435732SShan Wei switch (addr_param->p.type) { 3011c4492586SWei Yongjun case SCTP_PARAM_IPV6_ADDRESS: 3012c4492586SWei Yongjun if (!asoc->peer.ipv6_address) 3013945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3014c4492586SWei Yongjun break; 3015c4492586SWei Yongjun case SCTP_PARAM_IPV4_ADDRESS: 3016c4492586SWei Yongjun if (!asoc->peer.ipv4_address) 3017945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3018c4492586SWei Yongjun break; 3019c4492586SWei Yongjun default: 3020945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3021c4492586SWei Yongjun } 3022c4492586SWei Yongjun 30236a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 30241da177e4SLinus Torvalds if (unlikely(!af)) 3025945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 30261da177e4SLinus Torvalds 3027dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); 302842e30bf3SVlad Yasevich 302942e30bf3SVlad Yasevich /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast 303042e30bf3SVlad Yasevich * or multicast address. 303142e30bf3SVlad Yasevich * (note: wildcard is permitted and requires special handling so 303242e30bf3SVlad Yasevich * make sure we check for that) 303342e30bf3SVlad Yasevich */ 303442e30bf3SVlad Yasevich if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) 3035945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 303642e30bf3SVlad Yasevich 30371da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 30381da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 303942e30bf3SVlad Yasevich /* Section 4.2.1: 304042e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the source 304142e30bf3SVlad Yasevich * address of the packet MUST be added. 304242e30bf3SVlad Yasevich */ 304342e30bf3SVlad Yasevich if (af->is_any(&addr)) 304442e30bf3SVlad Yasevich memcpy(&addr, &asconf->source, sizeof(addr)); 304542e30bf3SVlad Yasevich 30461da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 30471da177e4SLinus Torvalds * request and does not have the local resources to add this 30481da177e4SLinus Torvalds * new address to the association, it MUST return an Error 30491da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 30501da177e4SLinus Torvalds * Due to Resource Shortage'. 30511da177e4SLinus Torvalds */ 30521da177e4SLinus Torvalds 3053dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 30541da177e4SLinus Torvalds if (!peer) 30551da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 30561da177e4SLinus Torvalds 30571da177e4SLinus Torvalds /* Start the heartbeat timer. */ 30581da177e4SLinus Torvalds if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer))) 30591da177e4SLinus Torvalds sctp_transport_hold(peer); 30606af29cccSMichio Honda asoc->new_transport = peer; 30611da177e4SLinus Torvalds break; 30621da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 30631da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 30641da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 30651da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 30661da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 30671da177e4SLinus Torvalds */ 306842e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 30691da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 30701da177e4SLinus Torvalds 30711da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 30721da177e4SLinus Torvalds * address which is also the source address of the IP packet 30731da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 30741da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 30751da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 30761da177e4SLinus Torvalds * Delete Source IP Address' 30771da177e4SLinus Torvalds */ 3078b1364104SMichio Honda if (sctp_cmp_addr_exact(&asconf->source, &addr)) 30791da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 30801da177e4SLinus Torvalds 308142e30bf3SVlad Yasevich /* Section 4.2.2 308242e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 308342e30bf3SVlad Yasevich * addresses of the peer except the source address of the 308442e30bf3SVlad Yasevich * packet MUST be deleted. 308542e30bf3SVlad Yasevich */ 308642e30bf3SVlad Yasevich if (af->is_any(&addr)) { 308742e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 308842e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 308942e30bf3SVlad Yasevich asconf->transport); 309042e30bf3SVlad Yasevich } else 3091dd86d136SAl Viro sctp_assoc_del_peer(asoc, &addr); 30921da177e4SLinus Torvalds break; 30931da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 309442e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 309542e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 309642e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 309742e30bf3SVlad Yasevich * primary. 309842e30bf3SVlad Yasevich */ 309942e30bf3SVlad Yasevich if (af->is_any(&addr)) 310042e30bf3SVlad Yasevich memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); 310142e30bf3SVlad Yasevich 3102dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 31031da177e4SLinus Torvalds if (!peer) 3104945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 31051da177e4SLinus Torvalds 31061da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 31071da177e4SLinus Torvalds break; 31081da177e4SLinus Torvalds } 31091da177e4SLinus Torvalds 31101da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 31111da177e4SLinus Torvalds } 31121da177e4SLinus Torvalds 31136f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 31149de7922bSDaniel Borkmann bool sctp_verify_asconf(const struct sctp_association *asoc, 31159de7922bSDaniel Borkmann struct sctp_chunk *chunk, bool addr_param_needed, 31169de7922bSDaniel Borkmann struct sctp_paramhdr **errp) 31179de7922bSDaniel Borkmann { 31189de7922bSDaniel Borkmann sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) chunk->chunk_hdr; 31196f4c618dSWei Yongjun union sctp_params param; 31209de7922bSDaniel Borkmann bool addr_param_seen = false; 31216f4c618dSWei Yongjun 31229de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 31239de7922bSDaniel Borkmann size_t length = ntohs(param.p->length); 31249de7922bSDaniel Borkmann 31256f4c618dSWei Yongjun *errp = param.p; 31266f4c618dSWei Yongjun switch (param.p->type) { 31279de7922bSDaniel Borkmann case SCTP_PARAM_ERR_CAUSE: 31289de7922bSDaniel Borkmann break; 31299de7922bSDaniel Borkmann case SCTP_PARAM_IPV4_ADDRESS: 31309de7922bSDaniel Borkmann if (length != sizeof(sctp_ipv4addr_param_t)) 31319de7922bSDaniel Borkmann return false; 31329de7922bSDaniel Borkmann addr_param_seen = true; 31339de7922bSDaniel Borkmann break; 31349de7922bSDaniel Borkmann case SCTP_PARAM_IPV6_ADDRESS: 31359de7922bSDaniel Borkmann if (length != sizeof(sctp_ipv6addr_param_t)) 31369de7922bSDaniel Borkmann return false; 31379de7922bSDaniel Borkmann addr_param_seen = true; 31389de7922bSDaniel Borkmann break; 31396f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 31406f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 31416f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 31429de7922bSDaniel Borkmann /* In ASCONF chunks, these need to be first. */ 31439de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 31449de7922bSDaniel Borkmann return false; 31459de7922bSDaniel Borkmann length = ntohs(param.addip->param_hdr.length); 31469de7922bSDaniel Borkmann if (length < sizeof(sctp_addip_param_t) + 31476f4c618dSWei Yongjun sizeof(sctp_paramhdr_t)) 31489de7922bSDaniel Borkmann return false; 31496f4c618dSWei Yongjun break; 31506f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 31516f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 31526f4c618dSWei Yongjun if (length != sizeof(sctp_addip_param_t)) 31539de7922bSDaniel Borkmann return false; 31546f4c618dSWei Yongjun break; 31556f4c618dSWei Yongjun default: 31569de7922bSDaniel Borkmann /* This is unkown to us, reject! */ 31579de7922bSDaniel Borkmann return false; 31589de7922bSDaniel Borkmann } 31596f4c618dSWei Yongjun } 31606f4c618dSWei Yongjun 31619de7922bSDaniel Borkmann /* Remaining sanity checks. */ 31629de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 31639de7922bSDaniel Borkmann return false; 31649de7922bSDaniel Borkmann if (!addr_param_needed && addr_param_seen) 31659de7922bSDaniel Borkmann return false; 31669de7922bSDaniel Borkmann if (param.v != chunk->chunk_end) 31679de7922bSDaniel Borkmann return false; 31686f4c618dSWei Yongjun 31699de7922bSDaniel Borkmann return true; 31706f4c618dSWei Yongjun } 31716f4c618dSWei Yongjun 31721da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 31731da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 31741da177e4SLinus Torvalds */ 31751da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 31761da177e4SLinus Torvalds struct sctp_chunk *asconf) 31771da177e4SLinus Torvalds { 31789de7922bSDaniel Borkmann sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) asconf->chunk_hdr; 31799de7922bSDaniel Borkmann bool all_param_pass = true; 31809de7922bSDaniel Borkmann union sctp_params param; 31811da177e4SLinus Torvalds sctp_addiphdr_t *hdr; 31821da177e4SLinus Torvalds union sctp_addr_param *addr_param; 31831da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 31841da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 3185dbc16db1SAl Viro __be16 err_code; 31861da177e4SLinus Torvalds int length = 0; 3187f3830cccSWei Yongjun int chunk_len; 31881da177e4SLinus Torvalds __u32 serial; 31891da177e4SLinus Torvalds 3190f3830cccSWei Yongjun chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t); 31911da177e4SLinus Torvalds hdr = (sctp_addiphdr_t *)asconf->skb->data; 31921da177e4SLinus Torvalds serial = ntohl(hdr->serial); 31931da177e4SLinus Torvalds 31941da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 31951da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 31961da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 31971da177e4SLinus Torvalds chunk_len -= length; 31981da177e4SLinus Torvalds 31991da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 32007aa1b54bSJoe Perches * asconf parameter. 32011da177e4SLinus Torvalds */ 32026a435732SShan Wei length = ntohs(addr_param->p.length); 3203ea110733SJoe Perches asconf_param = (void *)addr_param + length; 32041da177e4SLinus Torvalds chunk_len -= length; 32051da177e4SLinus Torvalds 32061da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 32071da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 32082cab86beSWei Yongjun * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF 32097aa1b54bSJoe Perches * parameters. 32101da177e4SLinus Torvalds */ 32112cab86beSWei Yongjun asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); 32121da177e4SLinus Torvalds if (!asconf_ack) 32131da177e4SLinus Torvalds goto done; 32141da177e4SLinus Torvalds 32151da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 32169de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 32179de7922bSDaniel Borkmann /* Skip preceeding address parameters. */ 32189de7922bSDaniel Borkmann if (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 32199de7922bSDaniel Borkmann param.p->type == SCTP_PARAM_IPV6_ADDRESS) 32209de7922bSDaniel Borkmann continue; 32219de7922bSDaniel Borkmann 32221da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 32239de7922bSDaniel Borkmann param.addip); 32241da177e4SLinus Torvalds /* ADDIP 4.1 A7) 32251da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 32261da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 32271da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 32281da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 32291da177e4SLinus Torvalds * a specific success indication is present for the parameter. 32301da177e4SLinus Torvalds */ 32319de7922bSDaniel Borkmann if (err_code != SCTP_ERROR_NO_ERROR) 32329de7922bSDaniel Borkmann all_param_pass = false; 32331da177e4SLinus Torvalds if (!all_param_pass) 32349de7922bSDaniel Borkmann sctp_add_asconf_response(asconf_ack, param.addip->crr_id, 32359de7922bSDaniel Borkmann err_code, param.addip); 32361da177e4SLinus Torvalds 32371da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 32381da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 32391da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 32401da177e4SLinus Torvalds * in the ASCONF. 32411da177e4SLinus Torvalds */ 32429de7922bSDaniel Borkmann if (err_code == SCTP_ERROR_RSRC_LOW) 32431da177e4SLinus Torvalds goto done; 32441da177e4SLinus Torvalds } 32451da177e4SLinus Torvalds done: 32461da177e4SLinus Torvalds asoc->peer.addip_serial++; 32471da177e4SLinus Torvalds 32481da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 32491da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 32501da177e4SLinus Torvalds */ 32511da177e4SLinus Torvalds if (asconf_ack) { 32521da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3253a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3254a08de64dSVlad Yasevich &asoc->asconf_ack_list); 32551da177e4SLinus Torvalds } 32561da177e4SLinus Torvalds 32571da177e4SLinus Torvalds return asconf_ack; 32581da177e4SLinus Torvalds } 32591da177e4SLinus Torvalds 32601da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 3261425e0f68SWei Yongjun static void sctp_asconf_param_success(struct sctp_association *asoc, 32621da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 32631da177e4SLinus Torvalds { 32641da177e4SLinus Torvalds struct sctp_af *af; 32651da177e4SLinus Torvalds union sctp_addr addr; 32661da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 32671da177e4SLinus Torvalds union sctp_addr_param *addr_param; 32681da177e4SLinus Torvalds struct sctp_transport *transport; 3269dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 32701da177e4SLinus Torvalds 3271ea110733SJoe Perches addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); 32721da177e4SLinus Torvalds 32731da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 32746a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 3275dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 32761da177e4SLinus Torvalds 32771da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 32781da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3279559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3280559cf710SVlad Yasevich * held, so the list can not change. 3281559cf710SVlad Yasevich */ 32820ed90fb0SVlad Yasevich local_bh_disable(); 3283559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3284dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3285f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3286dc022a98SSridhar Samudrala } 32870ed90fb0SVlad Yasevich local_bh_enable(); 32883cd9749cSWei Yongjun list_for_each_entry(transport, &asoc->peer.transport_addr_list, 32893cd9749cSWei Yongjun transports) { 32903cd9749cSWei Yongjun dst_release(transport->dst); 3291c6ef006bSVlad Yasevich transport->dst = NULL; 32923cd9749cSWei Yongjun } 32931da177e4SLinus Torvalds break; 32941da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 32950ed90fb0SVlad Yasevich local_bh_disable(); 3296425e0f68SWei Yongjun sctp_del_bind_addr(bp, &addr); 32978a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending != NULL && 32988a07eb0aSMichio Honda sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { 32998a07eb0aSMichio Honda kfree(asoc->asconf_addr_del_pending); 33008a07eb0aSMichio Honda asoc->asconf_addr_del_pending = NULL; 33018a07eb0aSMichio Honda } 33020ed90fb0SVlad Yasevich local_bh_enable(); 33039dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33049dbc15f0SRobert P. J. Day transports) { 3305dc022a98SSridhar Samudrala dst_release(transport->dst); 3306c6ef006bSVlad Yasevich transport->dst = NULL; 33071da177e4SLinus Torvalds } 33081da177e4SLinus Torvalds break; 33091da177e4SLinus Torvalds default: 33101da177e4SLinus Torvalds break; 33111da177e4SLinus Torvalds } 33121da177e4SLinus Torvalds } 33131da177e4SLinus Torvalds 33141da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 33151da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 33161da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 33171da177e4SLinus Torvalds * ADDIP 4.1 33181da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 33191da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 33201da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 33211da177e4SLinus Torvalds * specific success indication is present for the parameter. 33221da177e4SLinus Torvalds */ 3323dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 33241da177e4SLinus Torvalds sctp_addip_param_t *asconf_param, 33251da177e4SLinus Torvalds int no_err) 33261da177e4SLinus Torvalds { 33271da177e4SLinus Torvalds sctp_addip_param_t *asconf_ack_param; 33281da177e4SLinus Torvalds sctp_errhdr_t *err_param; 33291da177e4SLinus Torvalds int length; 3330f3830cccSWei Yongjun int asconf_ack_len; 3331dbc16db1SAl Viro __be16 err_code; 33321da177e4SLinus Torvalds 33331da177e4SLinus Torvalds if (no_err) 33341da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 33351da177e4SLinus Torvalds else 33361da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 33371da177e4SLinus Torvalds 3338f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3339f3830cccSWei Yongjun sizeof(sctp_chunkhdr_t); 3340f3830cccSWei Yongjun 33411da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 33421da177e4SLinus Torvalds * the first asconf_ack parameter. 33431da177e4SLinus Torvalds */ 33441da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 33451da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + 33461da177e4SLinus Torvalds length); 33471da177e4SLinus Torvalds asconf_ack_len -= length; 33481da177e4SLinus Torvalds 33491da177e4SLinus Torvalds while (asconf_ack_len > 0) { 33501da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 33511da177e4SLinus Torvalds switch (asconf_ack_param->param_hdr.type) { 33521da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 33531da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 33541da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 33551da177e4SLinus Torvalds length = sizeof(sctp_addip_param_t); 3356ea110733SJoe Perches err_param = (void *)asconf_ack_param + length; 33571da177e4SLinus Torvalds asconf_ack_len -= length; 33581da177e4SLinus Torvalds if (asconf_ack_len > 0) 33591da177e4SLinus Torvalds return err_param->cause; 33601da177e4SLinus Torvalds else 33611da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 33621da177e4SLinus Torvalds break; 33631da177e4SLinus Torvalds default: 33641da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 33651da177e4SLinus Torvalds } 33661da177e4SLinus Torvalds } 33671da177e4SLinus Torvalds 33681da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 3369ea110733SJoe Perches asconf_ack_param = (void *)asconf_ack_param + length; 33701da177e4SLinus Torvalds asconf_ack_len -= length; 33711da177e4SLinus Torvalds } 33721da177e4SLinus Torvalds 33731da177e4SLinus Torvalds return err_code; 33741da177e4SLinus Torvalds } 33751da177e4SLinus Torvalds 33761da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 33771da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 33781da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 33791da177e4SLinus Torvalds { 33801da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 33811da177e4SLinus Torvalds union sctp_addr_param *addr_param; 33821da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 33831da177e4SLinus Torvalds int length = 0; 33841da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 33851da177e4SLinus Torvalds int all_param_pass = 0; 33861da177e4SLinus Torvalds int no_err = 1; 33871da177e4SLinus Torvalds int retval = 0; 3388dbc16db1SAl Viro __be16 err_code = SCTP_ERROR_NO_ERROR; 33891da177e4SLinus Torvalds 33901da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 33911da177e4SLinus Torvalds * a pointer to address parameter. 33921da177e4SLinus Torvalds */ 33931da177e4SLinus Torvalds length = sizeof(sctp_addip_chunk_t); 33941da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 33951da177e4SLinus Torvalds asconf_len -= length; 33961da177e4SLinus Torvalds 33971da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 33987aa1b54bSJoe Perches * pointer to the first asconf parameter. 33991da177e4SLinus Torvalds */ 34006a435732SShan Wei length = ntohs(addr_param->p.length); 3401ea110733SJoe Perches asconf_param = (void *)addr_param + length; 34021da177e4SLinus Torvalds asconf_len -= length; 34031da177e4SLinus Torvalds 34041da177e4SLinus Torvalds /* ADDIP 4.1 34051da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 34061da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 34071da177e4SLinus Torvalds * successful. 34081da177e4SLinus Torvalds */ 34091da177e4SLinus Torvalds if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) 34101da177e4SLinus Torvalds all_param_pass = 1; 34111da177e4SLinus Torvalds 34121da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 34131da177e4SLinus Torvalds while (asconf_len > 0) { 34141da177e4SLinus Torvalds if (all_param_pass) 34151da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 34161da177e4SLinus Torvalds else { 34171da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 34181da177e4SLinus Torvalds asconf_param, 34191da177e4SLinus Torvalds no_err); 34201da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 34211da177e4SLinus Torvalds no_err = 0; 34221da177e4SLinus Torvalds } 34231da177e4SLinus Torvalds 34241da177e4SLinus Torvalds switch (err_code) { 34251da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 3426425e0f68SWei Yongjun sctp_asconf_param_success(asoc, asconf_param); 34271da177e4SLinus Torvalds break; 34281da177e4SLinus Torvalds 34291da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 34301da177e4SLinus Torvalds retval = 1; 34311da177e4SLinus Torvalds break; 34321da177e4SLinus Torvalds 3433a987f762SWei Yongjun case SCTP_ERROR_UNKNOWN_PARAM: 34341da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 34351da177e4SLinus Torvalds * future. 34361da177e4SLinus Torvalds */ 34371da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 34381da177e4SLinus Torvalds asconf_param->param_hdr.type; 34391da177e4SLinus Torvalds break; 34401da177e4SLinus Torvalds 34411da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 34421da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 34431da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 34441da177e4SLinus Torvalds default: 34451da177e4SLinus Torvalds break; 34461da177e4SLinus Torvalds } 34471da177e4SLinus Torvalds 34481da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 34491da177e4SLinus Torvalds * one. 34501da177e4SLinus Torvalds */ 34511da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3452ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 34531da177e4SLinus Torvalds asconf_len -= length; 34541da177e4SLinus Torvalds } 34551da177e4SLinus Torvalds 3456ddc4bbeeSMichio Honda if (no_err && asoc->src_out_of_asoc_ok) { 34578a07eb0aSMichio Honda asoc->src_out_of_asoc_ok = 0; 3458ddc4bbeeSMichio Honda sctp_transport_immediate_rtx(asoc->peer.primary_path); 3459ddc4bbeeSMichio Honda } 34608a07eb0aSMichio Honda 34611da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 34625f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 34631da177e4SLinus Torvalds sctp_chunk_free(asconf); 34641da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 34651da177e4SLinus Torvalds 34661da177e4SLinus Torvalds return retval; 34671da177e4SLinus Torvalds } 34681da177e4SLinus Torvalds 34691da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 34701da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 34711da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 34721da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 34731da177e4SLinus Torvalds { 34741da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 34751da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 34761da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 34771da177e4SLinus Torvalds size_t hint; 34781da177e4SLinus Torvalds int i; 34791da177e4SLinus Torvalds 34801da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 34811da177e4SLinus Torvalds 3482072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint); 34831da177e4SLinus Torvalds 34841da177e4SLinus Torvalds if (!retval) 34851da177e4SLinus Torvalds return NULL; 34861da177e4SLinus Torvalds 34871da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 34881da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 34891da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 34901da177e4SLinus Torvalds 34911da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 34921da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 34931da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 34941da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 34951da177e4SLinus Torvalds } 34961da177e4SLinus Torvalds 34971da177e4SLinus Torvalds return retval; 34981da177e4SLinus Torvalds } 3499