160c778b2SVlad Yasevich /* SCTP kernel implementation 21da177e4SLinus Torvalds * (C) Copyright IBM Corp. 2001, 2004 31da177e4SLinus Torvalds * Copyright (c) 1999-2000 Cisco, Inc. 41da177e4SLinus Torvalds * Copyright (c) 1999-2001 Motorola, Inc. 51da177e4SLinus Torvalds * Copyright (c) 2001-2002 Intel Corp. 61da177e4SLinus Torvalds * 760c778b2SVlad Yasevich * This file is part of the SCTP kernel implementation 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * These functions work with the state functions in sctp_sm_statefuns.c 101da177e4SLinus Torvalds * to implement the state operations. These functions implement the 111da177e4SLinus Torvalds * steps which require modifying existing data structures. 121da177e4SLinus Torvalds * 1360c778b2SVlad Yasevich * This SCTP implementation is free software; 141da177e4SLinus Torvalds * you can redistribute it and/or modify it under the terms of 151da177e4SLinus Torvalds * the GNU General Public License as published by 161da177e4SLinus Torvalds * the Free Software Foundation; either version 2, or (at your option) 171da177e4SLinus Torvalds * any later version. 181da177e4SLinus Torvalds * 1960c778b2SVlad Yasevich * This SCTP implementation is distributed in the hope that it 201da177e4SLinus Torvalds * will be useful, but WITHOUT ANY WARRANTY; without even the implied 211da177e4SLinus Torvalds * ************************ 221da177e4SLinus Torvalds * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 231da177e4SLinus Torvalds * See the GNU General Public License for more details. 241da177e4SLinus Torvalds * 251da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 264b2f13a2SJeff Kirsher * along with GNU CC; see the file COPYING. If not, see 274b2f13a2SJeff Kirsher * <http://www.gnu.org/licenses/>. 281da177e4SLinus Torvalds * 291da177e4SLinus Torvalds * Please send any bug reports or fixes you make to the 301da177e4SLinus Torvalds * email address(es): 3191705c61SDaniel Borkmann * lksctp developers <linux-sctp@vger.kernel.org> 321da177e4SLinus Torvalds * 331da177e4SLinus Torvalds * Written or modified by: 341da177e4SLinus Torvalds * La Monte H.P. Yarroll <piggy@acm.org> 351da177e4SLinus Torvalds * Karl Knutson <karl@athena.chicago.il.us> 361da177e4SLinus Torvalds * C. Robin <chris@hundredacre.ac.uk> 371da177e4SLinus Torvalds * Jon Grimm <jgrimm@us.ibm.com> 381da177e4SLinus Torvalds * Xingang Guo <xingang.guo@intel.com> 391da177e4SLinus Torvalds * Dajiang Zhang <dajiang.zhang@nokia.com> 401da177e4SLinus Torvalds * Sridhar Samudrala <sri@us.ibm.com> 411da177e4SLinus Torvalds * Daisy Chang <daisyc@us.ibm.com> 421da177e4SLinus Torvalds * Ardelle Fan <ardelle.fan@intel.com> 431da177e4SLinus Torvalds * Kevin Gao <kevin.gao@intel.com> 441da177e4SLinus Torvalds */ 451da177e4SLinus Torvalds 46145ce502SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 47145ce502SJoe Perches 485821c769SHerbert Xu #include <crypto/hash.h> 491da177e4SLinus Torvalds #include <linux/types.h> 501da177e4SLinus Torvalds #include <linux/kernel.h> 511da177e4SLinus Torvalds #include <linux/ip.h> 521da177e4SLinus Torvalds #include <linux/ipv6.h> 531da177e4SLinus Torvalds #include <linux/net.h> 541da177e4SLinus Torvalds #include <linux/inet.h> 55ebc3bbcfSChristian Borntraeger #include <linux/scatterlist.h> 565a0e3ad6STejun Heo #include <linux/slab.h> 571da177e4SLinus Torvalds #include <net/sock.h> 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds #include <linux/skbuff.h> 601da177e4SLinus Torvalds #include <linux/random.h> /* for get_random_bytes */ 611da177e4SLinus Torvalds #include <net/sctp/sctp.h> 621da177e4SLinus Torvalds #include <net/sctp/sm.h> 631da177e4SLinus Torvalds 64072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 65cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 66cea8768fSMarcelo Ricardo Leitner gfp_t gfp); 67072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 68cea8768fSMarcelo Ricardo Leitner __u8 flags, int paylen, gfp_t gfp); 69072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 70cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 71cea8768fSMarcelo Ricardo Leitner gfp_t gfp); 721da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 731da177e4SLinus Torvalds const struct sctp_association *asoc, 741da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 751da177e4SLinus Torvalds int *cookie_len, 761da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len); 771da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 781da177e4SLinus Torvalds union sctp_params param, 791da177e4SLinus Torvalds const union sctp_addr *peer_addr, 80dd0fc66fSAl Viro gfp_t gfp); 818ee4be37SVlad Yasevich static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 828ee4be37SVlad Yasevich const void *data); 836daaf0deSstephen hemminger static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len, 846daaf0deSstephen hemminger const void *data); 851da177e4SLinus Torvalds 86072017b4SVlad Yasevich /* Control chunk destructor */ 87072017b4SVlad Yasevich static void sctp_control_release_owner(struct sk_buff *skb) 88072017b4SVlad Yasevich { 89072017b4SVlad Yasevich /*TODO: do memory release */ 90072017b4SVlad Yasevich } 91072017b4SVlad Yasevich 92072017b4SVlad Yasevich static void sctp_control_set_owner_w(struct sctp_chunk *chunk) 93072017b4SVlad Yasevich { 94072017b4SVlad Yasevich struct sctp_association *asoc = chunk->asoc; 95072017b4SVlad Yasevich struct sk_buff *skb = chunk->skb; 96072017b4SVlad Yasevich 97072017b4SVlad Yasevich /* TODO: properly account for control chunks. 98072017b4SVlad Yasevich * To do it right we'll need: 99072017b4SVlad Yasevich * 1) endpoint if association isn't known. 100072017b4SVlad Yasevich * 2) proper memory accounting. 101072017b4SVlad Yasevich * 102072017b4SVlad Yasevich * For now don't do anything for now. 103072017b4SVlad Yasevich */ 104072017b4SVlad Yasevich skb->sk = asoc ? asoc->base.sk : NULL; 105072017b4SVlad Yasevich skb->destructor = sctp_control_release_owner; 106072017b4SVlad Yasevich } 107072017b4SVlad Yasevich 1081da177e4SLinus Torvalds /* What was the inbound interface for this chunk? */ 1091da177e4SLinus Torvalds int sctp_chunk_iif(const struct sctp_chunk *chunk) 1101da177e4SLinus Torvalds { 111e7487c86SMarcelo Ricardo Leitner struct sk_buff *skb = chunk->skb; 1121da177e4SLinus Torvalds 113e7487c86SMarcelo Ricardo Leitner return SCTP_INPUT_CB(skb)->af->skb_iif(skb); 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 1171da177e4SLinus Torvalds * 1181da177e4SLinus Torvalds * Note 2: The ECN capable field is reserved for future use of 1191da177e4SLinus Torvalds * Explicit Congestion Notification. 1201da177e4SLinus Torvalds */ 1211da177e4SLinus Torvalds static const struct sctp_paramhdr ecap_param = { 1221da177e4SLinus Torvalds SCTP_PARAM_ECN_CAPABLE, 12309640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1241da177e4SLinus Torvalds }; 1251da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1261da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 12709640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1281da177e4SLinus Torvalds }; 1291da177e4SLinus Torvalds 1305fa782c2SNeil Horman /* A helper to initialize an op error inside a 1311da177e4SLinus Torvalds * provided chunk, as most cause codes will be embedded inside an 1321da177e4SLinus Torvalds * abort chunk. 1331da177e4SLinus Torvalds */ 1345bf2db03SAl Viro void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, 13500f1c2dfSWei Yongjun size_t paylen) 1361da177e4SLinus Torvalds { 1371da177e4SLinus Torvalds sctp_errhdr_t err; 1381da177e4SLinus Torvalds __u16 len; 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds /* Cause code constants are now defined in network order. */ 1411da177e4SLinus Torvalds err.cause = cause_code; 1421da177e4SLinus Torvalds len = sizeof(sctp_errhdr_t) + paylen; 1431da177e4SLinus Torvalds err.length = htons(len); 1444a1c0107SVlad Yasevich chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds 1475fa782c2SNeil Horman /* A helper to initialize an op error inside a 1485fa782c2SNeil Horman * provided chunk, as most cause codes will be embedded inside an 1495fa782c2SNeil Horman * abort chunk. Differs from sctp_init_cause in that it won't oops 1505fa782c2SNeil Horman * if there isn't enough space in the op error chunk 1515fa782c2SNeil Horman */ 152db28aafaSIoan Orghici static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code, 1535fa782c2SNeil Horman size_t paylen) 1545fa782c2SNeil Horman { 1555fa782c2SNeil Horman sctp_errhdr_t err; 1565fa782c2SNeil Horman __u16 len; 1575fa782c2SNeil Horman 1585fa782c2SNeil Horman /* Cause code constants are now defined in network order. */ 1595fa782c2SNeil Horman err.cause = cause_code; 1605fa782c2SNeil Horman len = sizeof(sctp_errhdr_t) + paylen; 1615fa782c2SNeil Horman err.length = htons(len); 1625fa782c2SNeil Horman 1632e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) < len) 1645fa782c2SNeil Horman return -ENOSPC; 1655fa782c2SNeil Horman chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, 1665fa782c2SNeil Horman sizeof(sctp_errhdr_t), 1675fa782c2SNeil Horman &err); 1685fa782c2SNeil Horman return 0; 1695fa782c2SNeil Horman } 1701da177e4SLinus Torvalds /* 3.3.2 Initiation (INIT) (1) 1711da177e4SLinus Torvalds * 1721da177e4SLinus Torvalds * This chunk is used to initiate a SCTP association between two 1731da177e4SLinus Torvalds * endpoints. The format of the INIT chunk is shown below: 1741da177e4SLinus Torvalds * 1751da177e4SLinus Torvalds * 0 1 2 3 1761da177e4SLinus 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 1771da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1781da177e4SLinus Torvalds * | Type = 1 | Chunk Flags | Chunk Length | 1791da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1801da177e4SLinus Torvalds * | Initiate Tag | 1811da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1821da177e4SLinus Torvalds * | Advertised Receiver Window Credit (a_rwnd) | 1831da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1841da177e4SLinus Torvalds * | Number of Outbound Streams | Number of Inbound Streams | 1851da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1861da177e4SLinus Torvalds * | Initial TSN | 1871da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1881da177e4SLinus Torvalds * \ \ 1891da177e4SLinus Torvalds * / Optional/Variable-Length Parameters / 1901da177e4SLinus Torvalds * \ \ 1911da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1921da177e4SLinus Torvalds * 1931da177e4SLinus Torvalds * 1941da177e4SLinus Torvalds * The INIT chunk contains the following parameters. Unless otherwise 1951da177e4SLinus Torvalds * noted, each parameter MUST only be included once in the INIT chunk. 1961da177e4SLinus Torvalds * 1971da177e4SLinus Torvalds * Fixed Parameters Status 1981da177e4SLinus Torvalds * ---------------------------------------------- 1991da177e4SLinus Torvalds * Initiate Tag Mandatory 2001da177e4SLinus Torvalds * Advertised Receiver Window Credit Mandatory 2011da177e4SLinus Torvalds * Number of Outbound Streams Mandatory 2021da177e4SLinus Torvalds * Number of Inbound Streams Mandatory 2031da177e4SLinus Torvalds * Initial TSN Mandatory 2041da177e4SLinus Torvalds * 2051da177e4SLinus Torvalds * Variable Parameters Status Type Value 2061da177e4SLinus Torvalds * ------------------------------------------------------------- 2071da177e4SLinus Torvalds * IPv4 Address (Note 1) Optional 5 2081da177e4SLinus Torvalds * IPv6 Address (Note 1) Optional 6 2091da177e4SLinus Torvalds * Cookie Preservative Optional 9 2101da177e4SLinus Torvalds * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) 2111da177e4SLinus Torvalds * Host Name Address (Note 3) Optional 11 2121da177e4SLinus Torvalds * Supported Address Types (Note 4) Optional 12 2131da177e4SLinus Torvalds */ 2141da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, 2151da177e4SLinus Torvalds const struct sctp_bind_addr *bp, 216dd0fc66fSAl Viro gfp_t gfp, int vparam_len) 2171da177e4SLinus Torvalds { 218e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 219b14878ccSVlad Yasevich struct sctp_endpoint *ep = asoc->ep; 2201da177e4SLinus Torvalds sctp_inithdr_t init; 2211da177e4SLinus Torvalds union sctp_params addrs; 2221da177e4SLinus Torvalds size_t chunksize; 2231da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 2241da177e4SLinus Torvalds int num_types, addrs_len = 0; 2251da177e4SLinus Torvalds struct sctp_sock *sp; 2261da177e4SLinus Torvalds sctp_supported_addrs_param_t sat; 2273dbe8656SAl Viro __be16 types[2]; 2280f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 229131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 230131a47e3SVlad Yasevich int num_ext = 0; 231131a47e3SVlad Yasevich __u8 extensions[3]; 232730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 233730fc3d0SVlad Yasevich *auth_hmacs = NULL; 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2361da177e4SLinus Torvalds * 2371da177e4SLinus Torvalds * Note 1: The INIT chunks can contain multiple addresses that 2381da177e4SLinus Torvalds * can be IPv4 and/or IPv6 in any combination. 2391da177e4SLinus Torvalds */ 2401da177e4SLinus Torvalds retval = NULL; 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds /* Convert the provided bind address list to raw format. */ 2431da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds init.init_tag = htonl(asoc->c.my_vtag); 2461da177e4SLinus Torvalds init.a_rwnd = htonl(asoc->rwnd); 2471da177e4SLinus Torvalds init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2481da177e4SLinus Torvalds init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2491da177e4SLinus Torvalds init.initial_tsn = htonl(asoc->c.initial_tsn); 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds /* How many address types are needed? */ 2521da177e4SLinus Torvalds sp = sctp_sk(asoc->base.sk); 2531da177e4SLinus Torvalds num_types = sp->pf->supported_addrs(sp, types); 2541da177e4SLinus Torvalds 255a8170c35SWei Yongjun chunksize = sizeof(init) + addrs_len; 256e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types)); 2571da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 2588ee4be37SVlad Yasevich 25928aa4c26SXin Long if (asoc->prsctp_enable) 260036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 261036b579bSVlad Yasevich 262131a47e3SVlad Yasevich /* ADDIP: Section 4.2.7: 263131a47e3SVlad Yasevich * An implementation supporting this extension [ADDIP] MUST list 264131a47e3SVlad Yasevich * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and 265131a47e3SVlad Yasevich * INIT-ACK parameters. 266131a47e3SVlad Yasevich */ 267e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) { 268131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 269131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 270131a47e3SVlad Yasevich num_ext += 2; 271131a47e3SVlad Yasevich } 272131a47e3SVlad Yasevich 273c28445c3SXin Long if (asoc->reconf_enable) { 274c28445c3SXin Long extensions[num_ext] = SCTP_CID_RECONF; 275c28445c3SXin Long num_ext += 1; 276c28445c3SXin Long } 277c28445c3SXin Long 2786fc791eeSmalc if (sp->adaptation_ind) 2791da177e4SLinus Torvalds chunksize += sizeof(aiparam); 2806fc791eeSmalc 2811da177e4SLinus Torvalds chunksize += vparam_len; 2821da177e4SLinus Torvalds 283730fc3d0SVlad Yasevich /* Account for AUTH related parameters */ 284b14878ccSVlad Yasevich if (ep->auth_enable) { 285730fc3d0SVlad Yasevich /* Add random parameter length*/ 286730fc3d0SVlad Yasevich chunksize += sizeof(asoc->c.auth_random); 287730fc3d0SVlad Yasevich 288730fc3d0SVlad Yasevich /* Add HMACS parameter length if any were defined */ 289730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 290730fc3d0SVlad Yasevich if (auth_hmacs->length) 291e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); 292730fc3d0SVlad Yasevich else 293730fc3d0SVlad Yasevich auth_hmacs = NULL; 294730fc3d0SVlad Yasevich 295730fc3d0SVlad Yasevich /* Add CHUNKS parameter length */ 296730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 297730fc3d0SVlad Yasevich if (auth_chunks->length) 298e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); 299730fc3d0SVlad Yasevich else 3009baffaa6SVlad Yasevich auth_chunks = NULL; 301730fc3d0SVlad Yasevich 302730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 303730fc3d0SVlad Yasevich num_ext += 1; 304730fc3d0SVlad Yasevich } 305730fc3d0SVlad Yasevich 306131a47e3SVlad Yasevich /* If we have any extensions to report, account for that */ 307131a47e3SVlad Yasevich if (num_ext) 308e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(sizeof(sctp_supported_ext_param_t) + 309a8170c35SWei Yongjun num_ext); 310131a47e3SVlad Yasevich 3111da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3121da177e4SLinus Torvalds * 3131da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 3141da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 3151da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 3161da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 3171da177e4SLinus Torvalds * other address types if the Host Name address parameter is 3181da177e4SLinus Torvalds * present in the received INIT chunk. 3191da177e4SLinus Torvalds * 3201da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 3211da177e4SLinus Torvalds */ 3221da177e4SLinus Torvalds 323cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp); 3241da177e4SLinus Torvalds if (!retval) 3251da177e4SLinus Torvalds goto nodata; 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds retval->subh.init_hdr = 3281da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 3291da177e4SLinus Torvalds retval->param_hdr.v = 3301da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3331da177e4SLinus Torvalds * 3341da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 3351da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 3361da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 3371da177e4SLinus Torvalds * support any address type. 3381da177e4SLinus Torvalds */ 3391da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 3401da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 3411da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 3421da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 345131a47e3SVlad Yasevich 3467aa1b54bSJoe Perches /* Add the supported extensions parameter. Be nice and add this 347131a47e3SVlad Yasevich * fist before addiding the parameters for the extensions themselves 348131a47e3SVlad Yasevich */ 349131a47e3SVlad Yasevich if (num_ext) { 350131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 351131a47e3SVlad Yasevich ext_param.param_hdr.length = 352131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 353131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 354131a47e3SVlad Yasevich &ext_param); 3558ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 356131a47e3SVlad Yasevich } 357131a47e3SVlad Yasevich 35828aa4c26SXin Long if (asoc->prsctp_enable) 3591da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 360131a47e3SVlad Yasevich 3616fc791eeSmalc if (sp->adaptation_ind) { 3620f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 3631da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3640f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sp->adaptation_ind); 3651da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 3666fc791eeSmalc } 367131a47e3SVlad Yasevich 368730fc3d0SVlad Yasevich /* Add SCTP-AUTH chunks to the parameter list */ 369b14878ccSVlad Yasevich if (ep->auth_enable) { 370730fc3d0SVlad Yasevich sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), 371730fc3d0SVlad Yasevich asoc->c.auth_random); 372730fc3d0SVlad Yasevich if (auth_hmacs) 373730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 374730fc3d0SVlad Yasevich auth_hmacs); 375730fc3d0SVlad Yasevich if (auth_chunks) 376730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 377730fc3d0SVlad Yasevich auth_chunks); 378730fc3d0SVlad Yasevich } 3791da177e4SLinus Torvalds nodata: 3801da177e4SLinus Torvalds kfree(addrs.v); 3811da177e4SLinus Torvalds return retval; 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 3841da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 3851da177e4SLinus Torvalds const struct sctp_chunk *chunk, 386dd0fc66fSAl Viro gfp_t gfp, int unkparam_len) 3871da177e4SLinus Torvalds { 3881da177e4SLinus Torvalds sctp_inithdr_t initack; 3891da177e4SLinus Torvalds struct sctp_chunk *retval; 3901da177e4SLinus Torvalds union sctp_params addrs; 3916fc791eeSmalc struct sctp_sock *sp; 3921da177e4SLinus Torvalds int addrs_len; 3931da177e4SLinus Torvalds sctp_cookie_param_t *cookie; 3941da177e4SLinus Torvalds int cookie_len; 3951da177e4SLinus Torvalds size_t chunksize; 3960f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 397131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 398131a47e3SVlad Yasevich int num_ext = 0; 399131a47e3SVlad Yasevich __u8 extensions[3]; 400730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 401730fc3d0SVlad Yasevich *auth_hmacs = NULL, 402730fc3d0SVlad Yasevich *auth_random = NULL; 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds retval = NULL; 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 4071da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 4101da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 4111da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 4121da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 4131da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 4161da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 4171da177e4SLinus Torvalds */ 4181da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 4191da177e4SLinus Torvalds addrs.v, addrs_len); 4201da177e4SLinus Torvalds if (!cookie) 4211da177e4SLinus Torvalds goto nomem_cookie; 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 4241da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 4251da177e4SLinus Torvalds */ 4266fc791eeSmalc sp = sctp_sk(asoc->base.sk); 4271da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 4301da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4311da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 4321da177e4SLinus Torvalds 4335ffad5acSWei Yongjun if (asoc->peer.prsctp_capable) 434036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 435036b579bSVlad Yasevich 4365ffad5acSWei Yongjun if (asoc->peer.asconf_capable) { 437131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 438131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 439131a47e3SVlad Yasevich num_ext += 2; 440131a47e3SVlad Yasevich } 441131a47e3SVlad Yasevich 442c28445c3SXin Long if (asoc->peer.reconf_capable) { 443c28445c3SXin Long extensions[num_ext] = SCTP_CID_RECONF; 444c28445c3SXin Long num_ext += 1; 445c28445c3SXin Long } 446c28445c3SXin Long 4476fc791eeSmalc if (sp->adaptation_ind) 4481da177e4SLinus Torvalds chunksize += sizeof(aiparam); 4491da177e4SLinus Torvalds 450730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 451730fc3d0SVlad Yasevich auth_random = (sctp_paramhdr_t *)asoc->c.auth_random; 452730fc3d0SVlad Yasevich chunksize += ntohs(auth_random->length); 453730fc3d0SVlad Yasevich 454730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 455730fc3d0SVlad Yasevich if (auth_hmacs->length) 456e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); 457730fc3d0SVlad Yasevich else 458730fc3d0SVlad Yasevich auth_hmacs = NULL; 459730fc3d0SVlad Yasevich 460730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 461730fc3d0SVlad Yasevich if (auth_chunks->length) 462e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); 463730fc3d0SVlad Yasevich else 464730fc3d0SVlad Yasevich auth_chunks = NULL; 465730fc3d0SVlad Yasevich 466730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 467730fc3d0SVlad Yasevich num_ext += 1; 468730fc3d0SVlad Yasevich } 469730fc3d0SVlad Yasevich 4708ee4be37SVlad Yasevich if (num_ext) 471e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(sizeof(sctp_supported_ext_param_t) + 472a8170c35SWei Yongjun num_ext); 4738ee4be37SVlad Yasevich 4741da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 475cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp); 4761da177e4SLinus Torvalds if (!retval) 4771da177e4SLinus Torvalds goto nomem_chunk; 4781da177e4SLinus Torvalds 479b99a4d53SDan Carpenter /* RFC 2960 6.4 Multi-homed SCTP Endpoints 480b99a4d53SDan Carpenter * 481b99a4d53SDan Carpenter * An endpoint SHOULD transmit reply chunks (e.g., SACK, 482b99a4d53SDan Carpenter * HEARTBEAT ACK, * etc.) to the same destination transport 483b99a4d53SDan Carpenter * address from which it received the DATA or control chunk 484b99a4d53SDan Carpenter * to which it is replying. 485b99a4d53SDan Carpenter * 486b99a4d53SDan Carpenter * [INIT ACK back to where the INIT came from.] 4871da177e4SLinus Torvalds */ 4881da177e4SLinus Torvalds retval->transport = chunk->transport; 489b99a4d53SDan Carpenter 4901da177e4SLinus Torvalds retval->subh.init_hdr = 4911da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 4921da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 4931da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 4941da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4951da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 496131a47e3SVlad Yasevich if (num_ext) { 497131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 498131a47e3SVlad Yasevich ext_param.param_hdr.length = 499131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 500131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 501131a47e3SVlad Yasevich &ext_param); 5028ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 503131a47e3SVlad Yasevich } 5041da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 5051da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 5061da177e4SLinus Torvalds 5076fc791eeSmalc if (sp->adaptation_ind) { 5080f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 5091da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 5106fc791eeSmalc aiparam.adaptation_ind = htonl(sp->adaptation_ind); 5111da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 5126fc791eeSmalc } 5131da177e4SLinus Torvalds 514730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 515730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_random->length), 516730fc3d0SVlad Yasevich auth_random); 517730fc3d0SVlad Yasevich if (auth_hmacs) 518730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 519730fc3d0SVlad Yasevich auth_hmacs); 520730fc3d0SVlad Yasevich if (auth_chunks) 521730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 522730fc3d0SVlad Yasevich auth_chunks); 523730fc3d0SVlad Yasevich } 524730fc3d0SVlad Yasevich 5251da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 5261da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds nomem_chunk: 5291da177e4SLinus Torvalds kfree(cookie); 5301da177e4SLinus Torvalds nomem_cookie: 5311da177e4SLinus Torvalds kfree(addrs.v); 5321da177e4SLinus Torvalds return retval; 5331da177e4SLinus Torvalds } 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 5361da177e4SLinus Torvalds * 5371da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 5381da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 5391da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 5401da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 5411da177e4SLinus Torvalds * chunks in the same packet. 5421da177e4SLinus Torvalds * 5431da177e4SLinus Torvalds * 0 1 2 3 5441da177e4SLinus 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 5451da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5461da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 5471da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5481da177e4SLinus Torvalds * / Cookie / 5491da177e4SLinus Torvalds * \ \ 5501da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5511da177e4SLinus Torvalds * 5521da177e4SLinus Torvalds * Chunk Flags: 8 bit 5531da177e4SLinus Torvalds * 5541da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5551da177e4SLinus Torvalds * 5561da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 5571da177e4SLinus Torvalds * 5581da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 5591da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 5601da177e4SLinus Torvalds * 5611da177e4SLinus Torvalds * Cookie: variable size 5621da177e4SLinus Torvalds * 5631da177e4SLinus Torvalds * This field must contain the exact cookie received in the 5641da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 5651da177e4SLinus Torvalds * 5661da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 5671da177e4SLinus Torvalds * to insure interoperability. 5681da177e4SLinus Torvalds */ 5691da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 5701da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5711da177e4SLinus Torvalds { 5721da177e4SLinus Torvalds struct sctp_chunk *retval; 5731da177e4SLinus Torvalds void *cookie; 5741da177e4SLinus Torvalds int cookie_len; 5751da177e4SLinus Torvalds 5761da177e4SLinus Torvalds cookie = asoc->peer.cookie; 5771da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 580cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, 581cea8768fSMarcelo Ricardo Leitner cookie_len, GFP_ATOMIC); 5821da177e4SLinus Torvalds if (!retval) 5831da177e4SLinus Torvalds goto nodata; 5841da177e4SLinus Torvalds retval->subh.cookie_hdr = 5851da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5861da177e4SLinus Torvalds 5871da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5881da177e4SLinus Torvalds * 5891da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5901da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5911da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5921da177e4SLinus Torvalds * to which it is replying. 5931da177e4SLinus Torvalds * 5941da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 5951da177e4SLinus Torvalds */ 5961da177e4SLinus Torvalds if (chunk) 5971da177e4SLinus Torvalds retval->transport = chunk->transport; 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds nodata: 6001da177e4SLinus Torvalds return retval; 6011da177e4SLinus Torvalds } 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 6041da177e4SLinus Torvalds * 6051da177e4SLinus Torvalds * This chunk is used only during the initialization of an 6061da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 6071da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 6081da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 6091da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 6101da177e4SLinus Torvalds * 6111da177e4SLinus Torvalds * 0 1 2 3 6121da177e4SLinus 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 6131da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6141da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 6151da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6161da177e4SLinus Torvalds * 6171da177e4SLinus Torvalds * Chunk Flags: 8 bits 6181da177e4SLinus Torvalds * 6191da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 6201da177e4SLinus Torvalds */ 6211da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 6221da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6231da177e4SLinus Torvalds { 6241da177e4SLinus Torvalds struct sctp_chunk *retval; 6251da177e4SLinus Torvalds 626cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC); 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6291da177e4SLinus Torvalds * 6301da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6311da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6321da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6331da177e4SLinus Torvalds * to which it is replying. 6341da177e4SLinus Torvalds * 6351da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 6361da177e4SLinus Torvalds */ 6371da177e4SLinus Torvalds if (retval && chunk) 6381da177e4SLinus Torvalds retval->transport = chunk->transport; 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds return retval; 6411da177e4SLinus Torvalds } 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds /* 6441da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 6451da177e4SLinus Torvalds * CWR: 6461da177e4SLinus Torvalds * 6471da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 6481da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 6491da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 6501da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 6511da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 6521da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 6531da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 6541da177e4SLinus Torvalds * CE bit. 6551da177e4SLinus Torvalds * 6561da177e4SLinus Torvalds * 0 1 2 3 6571da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 6581da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6591da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 6601da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6611da177e4SLinus Torvalds * | Lowest TSN Number | 6621da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6631da177e4SLinus Torvalds * 6641da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 6651da177e4SLinus Torvalds */ 6661da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 6671da177e4SLinus Torvalds const __u32 lowest_tsn, 6681da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6691da177e4SLinus Torvalds { 6701da177e4SLinus Torvalds struct sctp_chunk *retval; 6711da177e4SLinus Torvalds sctp_cwrhdr_t cwr; 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 674072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, 675cea8768fSMarcelo Ricardo Leitner sizeof(sctp_cwrhdr_t), GFP_ATOMIC); 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds if (!retval) 6781da177e4SLinus Torvalds goto nodata; 6791da177e4SLinus Torvalds 6801da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 6811da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6841da177e4SLinus Torvalds * 6851da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6861da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6871da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6881da177e4SLinus Torvalds * to which it is replying. 6891da177e4SLinus Torvalds * 6901da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 6911da177e4SLinus Torvalds * came from.] 6921da177e4SLinus Torvalds */ 6931da177e4SLinus Torvalds if (chunk) 6941da177e4SLinus Torvalds retval->transport = chunk->transport; 6951da177e4SLinus Torvalds 6961da177e4SLinus Torvalds nodata: 6971da177e4SLinus Torvalds return retval; 6981da177e4SLinus Torvalds } 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 7011da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 7021da177e4SLinus Torvalds const __u32 lowest_tsn) 7031da177e4SLinus Torvalds { 7041da177e4SLinus Torvalds struct sctp_chunk *retval; 7051da177e4SLinus Torvalds sctp_ecnehdr_t ecne; 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 708072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, 709cea8768fSMarcelo Ricardo Leitner sizeof(sctp_ecnehdr_t), GFP_ATOMIC); 7101da177e4SLinus Torvalds if (!retval) 7111da177e4SLinus Torvalds goto nodata; 7121da177e4SLinus Torvalds retval->subh.ecne_hdr = 7131da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds nodata: 7161da177e4SLinus Torvalds return retval; 7171da177e4SLinus Torvalds } 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 7201da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 7211da177e4SLinus Torvalds */ 7221da177e4SLinus Torvalds struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, 7231da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 724cea8768fSMarcelo Ricardo Leitner int data_len, __u8 flags, __u16 ssn, 725cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 7261da177e4SLinus Torvalds { 7271da177e4SLinus Torvalds struct sctp_chunk *retval; 7281da177e4SLinus Torvalds struct sctp_datahdr dp; 7291da177e4SLinus Torvalds int chunk_len; 7301da177e4SLinus Torvalds 7311da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 7321da177e4SLinus Torvalds * creating the chunk. 7331da177e4SLinus Torvalds */ 7341da177e4SLinus Torvalds dp.tsn = 0; 7351da177e4SLinus Torvalds dp.stream = htons(sinfo->sinfo_stream); 7361da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 7371da177e4SLinus Torvalds 7381da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 739eaa5c54dSIvan Skytte Jorgensen if (sinfo->sinfo_flags & SCTP_UNORDERED) { 7401da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 7411da177e4SLinus Torvalds dp.ssn = 0; 7421da177e4SLinus Torvalds } else 7431da177e4SLinus Torvalds dp.ssn = htons(ssn); 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvalds chunk_len = sizeof(dp) + data_len; 746cea8768fSMarcelo Ricardo Leitner retval = sctp_make_data(asoc, flags, chunk_len, gfp); 7471da177e4SLinus Torvalds if (!retval) 7481da177e4SLinus Torvalds goto nodata; 7491da177e4SLinus Torvalds 7501da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 7511da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds nodata: 7541da177e4SLinus Torvalds return retval; 7551da177e4SLinus Torvalds } 7561da177e4SLinus Torvalds 7571da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 7581da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 7591da177e4SLinus Torvalds * including duplicates and gaps. 7601da177e4SLinus Torvalds */ 7611da177e4SLinus Torvalds struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) 7621da177e4SLinus Torvalds { 7631da177e4SLinus Torvalds struct sctp_chunk *retval; 7641da177e4SLinus Torvalds struct sctp_sackhdr sack; 7651da177e4SLinus Torvalds int len; 7661da177e4SLinus Torvalds __u32 ctsn; 7671da177e4SLinus Torvalds __u16 num_gabs, num_dup_tsns; 7684244854dSNeil Horman struct sctp_association *aptr = (struct sctp_association *)asoc; 7691da177e4SLinus Torvalds struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 77002015180SVlad Yasevich struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; 7714244854dSNeil Horman struct sctp_transport *trans; 7721da177e4SLinus Torvalds 77302015180SVlad Yasevich memset(gabs, 0, sizeof(gabs)); 7741da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 775bb33381dSDaniel Borkmann 776bb33381dSDaniel Borkmann pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn); 7771da177e4SLinus Torvalds 7781da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 77902015180SVlad Yasevich num_gabs = sctp_tsnmap_num_gabs(map, gabs); 7801da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 7811da177e4SLinus Torvalds 7821da177e4SLinus Torvalds /* Initialize the SACK header. */ 7831da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 7841da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 7851da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 7861da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds len = sizeof(sack) 7891da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 7901da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 7911da177e4SLinus Torvalds 7921da177e4SLinus Torvalds /* Create the chunk. */ 793cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC); 7941da177e4SLinus Torvalds if (!retval) 7951da177e4SLinus Torvalds goto nodata; 7961da177e4SLinus Torvalds 7971da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7981da177e4SLinus Torvalds * 7991da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8001da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 8011da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 8021da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 8031da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 8041da177e4SLinus Torvalds * reply chunk. 8051da177e4SLinus Torvalds * 8061da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 8071da177e4SLinus Torvalds * in packets from different source addresses in a single 8081da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 8091da177e4SLinus Torvalds * destination transport addresses from which the DATA or 8101da177e4SLinus Torvalds * control chunks being acknowledged were received. 8111da177e4SLinus Torvalds * 8121da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 8131da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 8141da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 8151da177e4SLinus Torvalds * duplicates. --piggy] 8161da177e4SLinus Torvalds * 8171da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 8181da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 8191da177e4SLinus Torvalds * destination address and not use the source address of the 8201da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 8211da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 8221da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 8231da177e4SLinus Torvalds * for the SACK is broken. 8241da177e4SLinus Torvalds * 8251da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 8261da177e4SLinus Torvalds */ 8271da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds retval->subh.sack_hdr = 8301da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds /* Add the gap ack block information. */ 8331da177e4SLinus Torvalds if (num_gabs) 8341da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 83502015180SVlad Yasevich gabs); 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 838196d6759SMichele Baldessari if (num_dup_tsns) { 839196d6759SMichele Baldessari aptr->stats.idupchunks += num_dup_tsns; 8401da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 8411da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 842196d6759SMichele Baldessari } 8434244854dSNeil Horman /* Once we have a sack generated, check to see what our sack 8444244854dSNeil Horman * generation is, if its 0, reset the transports to 0, and reset 8454244854dSNeil Horman * the association generation to 1 8464244854dSNeil Horman * 8474244854dSNeil Horman * The idea is that zero is never used as a valid generation for the 8484244854dSNeil Horman * association so no transport will match after a wrap event like this, 8494244854dSNeil Horman * Until the next sack 8504244854dSNeil Horman */ 8514244854dSNeil Horman if (++aptr->peer.sack_generation == 0) { 8524244854dSNeil Horman list_for_each_entry(trans, &asoc->peer.transport_addr_list, 8534244854dSNeil Horman transports) 8544244854dSNeil Horman trans->sack_generation = 0; 8554244854dSNeil Horman aptr->peer.sack_generation = 1; 8564244854dSNeil Horman } 8571da177e4SLinus Torvalds nodata: 8581da177e4SLinus Torvalds return retval; 8591da177e4SLinus Torvalds } 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 8621da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 8631da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8641da177e4SLinus Torvalds { 8651da177e4SLinus Torvalds struct sctp_chunk *retval; 8661da177e4SLinus Torvalds sctp_shutdownhdr_t shut; 8671da177e4SLinus Torvalds __u32 ctsn; 8681da177e4SLinus Torvalds 8691da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 8701da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 8711da177e4SLinus Torvalds 872072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, 873cea8768fSMarcelo Ricardo Leitner sizeof(sctp_shutdownhdr_t), GFP_ATOMIC); 8741da177e4SLinus Torvalds if (!retval) 8751da177e4SLinus Torvalds goto nodata; 8761da177e4SLinus Torvalds 8771da177e4SLinus Torvalds retval->subh.shutdown_hdr = 8781da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 8791da177e4SLinus Torvalds 8801da177e4SLinus Torvalds if (chunk) 8811da177e4SLinus Torvalds retval->transport = chunk->transport; 8821da177e4SLinus Torvalds nodata: 8831da177e4SLinus Torvalds return retval; 8841da177e4SLinus Torvalds } 8851da177e4SLinus Torvalds 8861da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8871da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8881da177e4SLinus Torvalds { 8891da177e4SLinus Torvalds struct sctp_chunk *retval; 8901da177e4SLinus Torvalds 891cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0, 892cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 8931da177e4SLinus Torvalds 8941da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8951da177e4SLinus Torvalds * 8961da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8971da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8981da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8991da177e4SLinus Torvalds * to which it is replying. 9001da177e4SLinus Torvalds * 9011da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 9021da177e4SLinus Torvalds */ 9031da177e4SLinus Torvalds if (retval && chunk) 9041da177e4SLinus Torvalds retval->transport = chunk->transport; 9051da177e4SLinus Torvalds 9061da177e4SLinus Torvalds return retval; 9071da177e4SLinus Torvalds } 9081da177e4SLinus Torvalds 9091da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 9101da177e4SLinus Torvalds const struct sctp_association *asoc, 9111da177e4SLinus Torvalds const struct sctp_chunk *chunk) 9121da177e4SLinus Torvalds { 9131da177e4SLinus Torvalds struct sctp_chunk *retval; 9141da177e4SLinus Torvalds __u8 flags = 0; 9151da177e4SLinus Torvalds 916047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 917047a2428SJerome Forissier * reflected) 918047a2428SJerome Forissier */ 9191da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 9201da177e4SLinus Torvalds 921cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 922cea8768fSMarcelo Ricardo Leitner 0, GFP_ATOMIC); 9231da177e4SLinus Torvalds 9241da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9251da177e4SLinus Torvalds * 9261da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9271da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9281da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9291da177e4SLinus Torvalds * to which it is replying. 9301da177e4SLinus Torvalds * 9311da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 9321da177e4SLinus Torvalds * came from.] 9331da177e4SLinus Torvalds */ 9341da177e4SLinus Torvalds if (retval && chunk) 9351da177e4SLinus Torvalds retval->transport = chunk->transport; 9361da177e4SLinus Torvalds 9371da177e4SLinus Torvalds return retval; 9381da177e4SLinus Torvalds } 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 941047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 9421da177e4SLinus Torvalds */ 9431da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 9441da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9451da177e4SLinus Torvalds const size_t hint) 9461da177e4SLinus Torvalds { 9471da177e4SLinus Torvalds struct sctp_chunk *retval; 9481da177e4SLinus Torvalds __u8 flags = 0; 9491da177e4SLinus Torvalds 950047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 951047a2428SJerome Forissier * an INIT (vtag will be reflected). 952047a2428SJerome Forissier */ 953047a2428SJerome Forissier if (!asoc) { 954047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 955047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 956047a2428SJerome Forissier flags = 0; 957047a2428SJerome Forissier else 958047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 959047a2428SJerome Forissier } 9601da177e4SLinus Torvalds 961cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint, 962cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9651da177e4SLinus Torvalds * 9661da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9671da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9681da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9691da177e4SLinus Torvalds * to which it is replying. 9701da177e4SLinus Torvalds * 9711da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9721da177e4SLinus Torvalds */ 9731da177e4SLinus Torvalds if (retval && chunk) 9741da177e4SLinus Torvalds retval->transport = chunk->transport; 9751da177e4SLinus Torvalds 9761da177e4SLinus Torvalds return retval; 9771da177e4SLinus Torvalds } 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 9801da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 9811da177e4SLinus Torvalds const struct sctp_association *asoc, 9821da177e4SLinus Torvalds const struct sctp_chunk *chunk, __u32 tsn) 9831da177e4SLinus Torvalds { 9841da177e4SLinus Torvalds struct sctp_chunk *retval; 9859f81bcd9SAl Viro __be32 payload; 9861da177e4SLinus Torvalds 9871da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) 9881da177e4SLinus Torvalds + sizeof(tsn)); 9891da177e4SLinus Torvalds 9901da177e4SLinus Torvalds if (!retval) 9911da177e4SLinus Torvalds goto no_mem; 9921da177e4SLinus Torvalds 9931da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 9941da177e4SLinus Torvalds payload = htonl(tsn); 99500f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 99600f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 9971da177e4SLinus Torvalds 9981da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9991da177e4SLinus Torvalds * 10001da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 10011da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 10021da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 10031da177e4SLinus Torvalds * to which it is replying. 10041da177e4SLinus Torvalds * 10051da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 10061da177e4SLinus Torvalds */ 10071da177e4SLinus Torvalds if (chunk) 10081da177e4SLinus Torvalds retval->transport = chunk->transport; 10091da177e4SLinus Torvalds 10101da177e4SLinus Torvalds no_mem: 10111da177e4SLinus Torvalds return retval; 10121da177e4SLinus Torvalds } 10131da177e4SLinus Torvalds 10141da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 10151da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 10166ce8e9ceSAl Viro struct msghdr *msg, 1017c164a9baSSridhar Samudrala size_t paylen) 10181da177e4SLinus Torvalds { 10191da177e4SLinus Torvalds struct sctp_chunk *retval; 1020c164a9baSSridhar Samudrala void *payload = NULL; 1021c164a9baSSridhar Samudrala int err; 10221da177e4SLinus Torvalds 1023c164a9baSSridhar Samudrala retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); 10241da177e4SLinus Torvalds if (!retval) 10251da177e4SLinus Torvalds goto err_chunk; 10261da177e4SLinus Torvalds 10271da177e4SLinus Torvalds if (paylen) { 10281da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 1029c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 10301da177e4SLinus Torvalds if (!payload) 10311da177e4SLinus Torvalds goto err_payload; 10321da177e4SLinus Torvalds 10336ce8e9ceSAl Viro err = memcpy_from_msg(payload, msg, paylen); 1034c164a9baSSridhar Samudrala if (err < 0) 10351da177e4SLinus Torvalds goto err_copy; 10361da177e4SLinus Torvalds } 10371da177e4SLinus Torvalds 103800f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 103900f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10401da177e4SLinus Torvalds 10411da177e4SLinus Torvalds if (paylen) 10421da177e4SLinus Torvalds kfree(payload); 10431da177e4SLinus Torvalds 10441da177e4SLinus Torvalds return retval; 10451da177e4SLinus Torvalds 10461da177e4SLinus Torvalds err_copy: 10471da177e4SLinus Torvalds kfree(payload); 10481da177e4SLinus Torvalds err_payload: 10491da177e4SLinus Torvalds sctp_chunk_free(retval); 10501da177e4SLinus Torvalds retval = NULL; 10511da177e4SLinus Torvalds err_chunk: 10521da177e4SLinus Torvalds return retval; 10531da177e4SLinus Torvalds } 10541da177e4SLinus Torvalds 10555c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 10565c94bf86SAdrian Bunk * enough. 10575c94bf86SAdrian Bunk */ 10585c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 10595c94bf86SAdrian Bunk const void *data) 10605c94bf86SAdrian Bunk { 10615c94bf86SAdrian Bunk void *target; 10625c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 10635c94bf86SAdrian Bunk 10645c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 10655c94bf86SAdrian Bunk 10666383cfb3SVlad Yasevich if (data) 10675c94bf86SAdrian Bunk memcpy(target, data, len); 10686383cfb3SVlad Yasevich else 10696383cfb3SVlad Yasevich memset(target, 0, len); 10705c94bf86SAdrian Bunk 10715c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 10725c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 10735c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 10745c94bf86SAdrian Bunk 10755c94bf86SAdrian Bunk return target; 10765c94bf86SAdrian Bunk } 10775c94bf86SAdrian Bunk 10781da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 10791da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 10801da177e4SLinus Torvalds const struct sctp_association *asoc, 10811da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10821da177e4SLinus Torvalds const __u8 *payload, 10831da177e4SLinus Torvalds const size_t paylen) 10841da177e4SLinus Torvalds { 10851da177e4SLinus Torvalds struct sctp_chunk *retval; 10861da177e4SLinus Torvalds struct sctp_paramhdr phdr; 10871da177e4SLinus Torvalds 10881da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen 108900f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10901da177e4SLinus Torvalds if (!retval) 10911da177e4SLinus Torvalds goto end; 10921da177e4SLinus Torvalds 109300f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen 109400f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10951da177e4SLinus Torvalds 10961da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 10971da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 109800f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 109900f1c2dfSWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr); 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds end: 11021da177e4SLinus Torvalds return retval; 11031da177e4SLinus Torvalds } 11041da177e4SLinus Torvalds 1105ba016670SWei Yongjun struct sctp_chunk *sctp_make_violation_paramlen( 1106ba016670SWei Yongjun const struct sctp_association *asoc, 1107ba016670SWei Yongjun const struct sctp_chunk *chunk, 1108ba016670SWei Yongjun struct sctp_paramhdr *param) 1109ba016670SWei Yongjun { 1110ba016670SWei Yongjun struct sctp_chunk *retval; 1111ba016670SWei Yongjun static const char error[] = "The following parameter had invalid length:"; 1112ba016670SWei Yongjun size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) + 1113ba016670SWei Yongjun sizeof(sctp_paramhdr_t); 1114ba016670SWei Yongjun 1115ba016670SWei Yongjun retval = sctp_make_abort(asoc, chunk, payload_len); 1116ba016670SWei Yongjun if (!retval) 1117ba016670SWei Yongjun goto nodata; 1118ba016670SWei Yongjun 1119ba016670SWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, 1120ba016670SWei Yongjun sizeof(error) + sizeof(sctp_paramhdr_t)); 1121ba016670SWei Yongjun sctp_addto_chunk(retval, sizeof(error), error); 1122ba016670SWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param); 1123ba016670SWei Yongjun 1124ba016670SWei Yongjun nodata: 1125ba016670SWei Yongjun return retval; 1126ba016670SWei Yongjun } 1127ba016670SWei Yongjun 1128de4594a5SNeil Horman struct sctp_chunk *sctp_make_violation_max_retrans( 1129de4594a5SNeil Horman const struct sctp_association *asoc, 1130de4594a5SNeil Horman const struct sctp_chunk *chunk) 1131de4594a5SNeil Horman { 1132de4594a5SNeil Horman struct sctp_chunk *retval; 1133de4594a5SNeil Horman static const char error[] = "Association exceeded its max_retans count"; 1134de4594a5SNeil Horman size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t); 1135de4594a5SNeil Horman 1136de4594a5SNeil Horman retval = sctp_make_abort(asoc, chunk, payload_len); 1137de4594a5SNeil Horman if (!retval) 1138de4594a5SNeil Horman goto nodata; 1139de4594a5SNeil Horman 1140de4594a5SNeil Horman sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); 1141de4594a5SNeil Horman sctp_addto_chunk(retval, sizeof(error), error); 1142de4594a5SNeil Horman 1143de4594a5SNeil Horman nodata: 1144de4594a5SNeil Horman return retval; 1145de4594a5SNeil Horman } 1146de4594a5SNeil Horman 11471da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 11481da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 114992c73af5SWei Yongjun const struct sctp_transport *transport) 11501da177e4SLinus Torvalds { 115192c73af5SWei Yongjun struct sctp_chunk *retval; 115292c73af5SWei Yongjun sctp_sender_hb_info_t hbinfo; 115392c73af5SWei Yongjun 1154cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, 1155cea8768fSMarcelo Ricardo Leitner sizeof(hbinfo), GFP_ATOMIC); 11561da177e4SLinus Torvalds 11571da177e4SLinus Torvalds if (!retval) 11581da177e4SLinus Torvalds goto nodata; 11591da177e4SLinus Torvalds 116092c73af5SWei Yongjun hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; 116192c73af5SWei Yongjun hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t)); 116292c73af5SWei Yongjun hbinfo.daddr = transport->ipaddr; 116392c73af5SWei Yongjun hbinfo.sent_at = jiffies; 116492c73af5SWei Yongjun hbinfo.hb_nonce = transport->hb_nonce; 116592c73af5SWei Yongjun 11661da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 11671da177e4SLinus Torvalds * what transport it belongs to. 11681da177e4SLinus Torvalds */ 11691da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 117092c73af5SWei Yongjun retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), 117192c73af5SWei Yongjun &hbinfo); 11721da177e4SLinus Torvalds 11731da177e4SLinus Torvalds nodata: 11741da177e4SLinus Torvalds return retval; 11751da177e4SLinus Torvalds } 11761da177e4SLinus Torvalds 11771da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 11781da177e4SLinus Torvalds const struct sctp_chunk *chunk, 11791da177e4SLinus Torvalds const void *payload, const size_t paylen) 11801da177e4SLinus Torvalds { 11811da177e4SLinus Torvalds struct sctp_chunk *retval; 11821da177e4SLinus Torvalds 1183cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen, 1184cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 11851da177e4SLinus Torvalds if (!retval) 11861da177e4SLinus Torvalds goto nodata; 11871da177e4SLinus Torvalds 11881da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 11891da177e4SLinus Torvalds 11901da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11911da177e4SLinus Torvalds * 11921da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11931da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 11941da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 11951da177e4SLinus Torvalds * to which it is replying. 11961da177e4SLinus Torvalds * 11971da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 11981da177e4SLinus Torvalds */ 11991da177e4SLinus Torvalds if (chunk) 12001da177e4SLinus Torvalds retval->transport = chunk->transport; 12011da177e4SLinus Torvalds 12021da177e4SLinus Torvalds nodata: 12031da177e4SLinus Torvalds return retval; 12041da177e4SLinus Torvalds } 12051da177e4SLinus Torvalds 12061da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 12071da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 12081da177e4SLinus Torvalds */ 12091da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 12101da177e4SLinus Torvalds const struct sctp_association *asoc, 12111da177e4SLinus Torvalds const struct sctp_chunk *chunk, 12121da177e4SLinus Torvalds size_t size) 12131da177e4SLinus Torvalds { 12141da177e4SLinus Torvalds struct sctp_chunk *retval; 12151da177e4SLinus Torvalds 1216072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, 1217cea8768fSMarcelo Ricardo Leitner sizeof(sctp_errhdr_t) + size, GFP_ATOMIC); 12181da177e4SLinus Torvalds if (!retval) 12191da177e4SLinus Torvalds goto nodata; 12201da177e4SLinus Torvalds 12211da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 12221da177e4SLinus Torvalds * 12231da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 12241da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 12251da177e4SLinus Torvalds * address from which it received the DATA or control chunk 12261da177e4SLinus Torvalds * to which it is replying. 12271da177e4SLinus Torvalds * 12281da177e4SLinus Torvalds */ 12291da177e4SLinus Torvalds if (chunk) 12301da177e4SLinus Torvalds retval->transport = chunk->transport; 12311da177e4SLinus Torvalds 12321da177e4SLinus Torvalds nodata: 12331da177e4SLinus Torvalds return retval; 12341da177e4SLinus Torvalds } 12351da177e4SLinus Torvalds 12365fa782c2SNeil Horman /* Create an Operation Error chunk of a fixed size, 12375fa782c2SNeil Horman * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) 12385fa782c2SNeil Horman * This is a helper function to allocate an error chunk for 12395fa782c2SNeil Horman * for those invalid parameter codes in which we may not want 1240d82603c6SJorrit Schippers * to report all the errors, if the incoming chunk is large 12415fa782c2SNeil Horman */ 12425fa782c2SNeil Horman static inline struct sctp_chunk *sctp_make_op_error_fixed( 12435fa782c2SNeil Horman const struct sctp_association *asoc, 12445fa782c2SNeil Horman const struct sctp_chunk *chunk) 12455fa782c2SNeil Horman { 12465fa782c2SNeil Horman size_t size = asoc ? asoc->pathmtu : 0; 12475fa782c2SNeil Horman 12485fa782c2SNeil Horman if (!size) 12495fa782c2SNeil Horman size = SCTP_DEFAULT_MAXSEGMENT; 12505fa782c2SNeil Horman 12515fa782c2SNeil Horman return sctp_make_op_error_space(asoc, chunk, size); 12525fa782c2SNeil Horman } 12535fa782c2SNeil Horman 12541da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 12551da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 12561da177e4SLinus Torvalds const struct sctp_chunk *chunk, 125763706c5cSAl Viro __be16 cause_code, const void *payload, 12586383cfb3SVlad Yasevich size_t paylen, size_t reserve_tail) 12591da177e4SLinus Torvalds { 12601da177e4SLinus Torvalds struct sctp_chunk *retval; 12611da177e4SLinus Torvalds 12626383cfb3SVlad Yasevich retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); 12631da177e4SLinus Torvalds if (!retval) 12641da177e4SLinus Torvalds goto nodata; 12651da177e4SLinus Torvalds 12666383cfb3SVlad Yasevich sctp_init_cause(retval, cause_code, paylen + reserve_tail); 126700f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 12686383cfb3SVlad Yasevich if (reserve_tail) 12696383cfb3SVlad Yasevich sctp_addto_param(retval, reserve_tail, NULL); 12701da177e4SLinus Torvalds 12711da177e4SLinus Torvalds nodata: 12721da177e4SLinus Torvalds return retval; 12731da177e4SLinus Torvalds } 12741da177e4SLinus Torvalds 12754cd57c80SVlad Yasevich struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) 12764cd57c80SVlad Yasevich { 12774cd57c80SVlad Yasevich struct sctp_chunk *retval; 12784cd57c80SVlad Yasevich struct sctp_hmac *hmac_desc; 12794cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 12804cd57c80SVlad Yasevich __u8 *hmac; 12814cd57c80SVlad Yasevich 12824cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 12834cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 12844cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 12854cd57c80SVlad Yasevich return NULL; 12864cd57c80SVlad Yasevich 1287072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, 1288cea8768fSMarcelo Ricardo Leitner hmac_desc->hmac_len + sizeof(sctp_authhdr_t), 1289cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 12904cd57c80SVlad Yasevich if (!retval) 12914cd57c80SVlad Yasevich return NULL; 12924cd57c80SVlad Yasevich 12934cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 12944cd57c80SVlad Yasevich auth_hdr.shkey_id = htons(asoc->active_key_id); 12954cd57c80SVlad Yasevich 12964cd57c80SVlad Yasevich retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t), 12974cd57c80SVlad Yasevich &auth_hdr); 12984cd57c80SVlad Yasevich 12994cd57c80SVlad Yasevich hmac = skb_put(retval->skb, hmac_desc->hmac_len); 13004cd57c80SVlad Yasevich memset(hmac, 0, hmac_desc->hmac_len); 13014cd57c80SVlad Yasevich 13024cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 13034cd57c80SVlad Yasevich retval->chunk_hdr->length = 13044cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 13054cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 13064cd57c80SVlad Yasevich 13074cd57c80SVlad Yasevich return retval; 13084cd57c80SVlad Yasevich } 13094cd57c80SVlad Yasevich 13104cd57c80SVlad Yasevich 13111da177e4SLinus Torvalds /******************************************************************** 13121da177e4SLinus Torvalds * 2nd Level Abstractions 13131da177e4SLinus Torvalds ********************************************************************/ 13141da177e4SLinus Torvalds 13151da177e4SLinus Torvalds /* Turn an skb into a chunk. 13161da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 13173dc0a548Swangweidong * 13183dc0a548Swangweidong * sctpimpguide-05.txt Section 2.8.2 13193dc0a548Swangweidong * M1) Each time a new DATA chunk is transmitted 13203dc0a548Swangweidong * set the 'TSN.Missing.Report' count for that TSN to 0. The 13213dc0a548Swangweidong * 'TSN.Missing.Report' count will be used to determine missing chunks 13223dc0a548Swangweidong * and when to fast retransmit. 13233dc0a548Swangweidong * 13241da177e4SLinus Torvalds */ 13251da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 13261da177e4SLinus Torvalds const struct sctp_association *asoc, 1327cea8768fSMarcelo Ricardo Leitner struct sock *sk, gfp_t gfp) 13281da177e4SLinus Torvalds { 13291da177e4SLinus Torvalds struct sctp_chunk *retval; 13301da177e4SLinus Torvalds 1331cea8768fSMarcelo Ricardo Leitner retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp); 13321da177e4SLinus Torvalds 13331da177e4SLinus Torvalds if (!retval) 13341da177e4SLinus Torvalds goto nodata; 1335bb33381dSDaniel Borkmann if (!sk) 1336bb33381dSDaniel Borkmann pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); 13371da177e4SLinus Torvalds 133879af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 13391da177e4SLinus Torvalds retval->skb = skb; 13401da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 13411da177e4SLinus Torvalds retval->singleton = 1; 13421da177e4SLinus Torvalds 1343c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 13441da177e4SLinus Torvalds 13451da177e4SLinus Torvalds /* Polish the bead hole. */ 13461da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 13471da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 13481da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 13491da177e4SLinus Torvalds atomic_set(&retval->refcnt, 1); 13501da177e4SLinus Torvalds 13511da177e4SLinus Torvalds nodata: 13521da177e4SLinus Torvalds return retval; 13531da177e4SLinus Torvalds } 13541da177e4SLinus Torvalds 13551da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 13561da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 13571da177e4SLinus Torvalds union sctp_addr *dest) 13581da177e4SLinus Torvalds { 1359f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 136016b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 13611da177e4SLinus Torvalds } 13621da177e4SLinus Torvalds 13631da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 13641da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 13651da177e4SLinus Torvalds { 13661da177e4SLinus Torvalds /* If we have a known transport, use that. */ 13671da177e4SLinus Torvalds if (chunk->transport) { 13686a1e5f33SAl Viro return &chunk->transport->ipaddr; 13691da177e4SLinus Torvalds } else { 13701da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 13716a1e5f33SAl Viro return &chunk->source; 13721da177e4SLinus Torvalds } 13731da177e4SLinus Torvalds } 13741da177e4SLinus Torvalds 13751da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 13761da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 13771da177e4SLinus Torvalds */ 1378072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 1379cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1380cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 13811da177e4SLinus Torvalds { 13821da177e4SLinus Torvalds struct sctp_chunk *retval; 13831da177e4SLinus Torvalds sctp_chunkhdr_t *chunk_hdr; 13841da177e4SLinus Torvalds struct sk_buff *skb; 13851da177e4SLinus Torvalds struct sock *sk; 13861da177e4SLinus Torvalds 13871da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 1388e2f036a9SMarcelo Ricardo Leitner skb = alloc_skb(SCTP_PAD4(sizeof(sctp_chunkhdr_t) + paylen), gfp); 13891da177e4SLinus Torvalds if (!skb) 13901da177e4SLinus Torvalds goto nodata; 13911da177e4SLinus Torvalds 13921da177e4SLinus Torvalds /* Make room for the chunk header. */ 13931da177e4SLinus Torvalds chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); 13941da177e4SLinus Torvalds chunk_hdr->type = type; 13951da177e4SLinus Torvalds chunk_hdr->flags = flags; 13961da177e4SLinus Torvalds chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); 13971da177e4SLinus Torvalds 13981da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 1399cea8768fSMarcelo Ricardo Leitner retval = sctp_chunkify(skb, asoc, sk, gfp); 14001da177e4SLinus Torvalds if (!retval) { 14011da177e4SLinus Torvalds kfree_skb(skb); 14021da177e4SLinus Torvalds goto nodata; 14031da177e4SLinus Torvalds } 14041da177e4SLinus Torvalds 14051da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 14061da177e4SLinus Torvalds retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); 14071da177e4SLinus Torvalds 14084cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 14094cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 14104cd57c80SVlad Yasevich retval->auth = 1; 14114cd57c80SVlad Yasevich 14121da177e4SLinus Torvalds return retval; 14131da177e4SLinus Torvalds nodata: 14141da177e4SLinus Torvalds return NULL; 14151da177e4SLinus Torvalds } 14161da177e4SLinus Torvalds 1417072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 1418cea8768fSMarcelo Ricardo Leitner __u8 flags, int paylen, gfp_t gfp) 1419072017b4SVlad Yasevich { 1420cea8768fSMarcelo Ricardo Leitner return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp); 1421072017b4SVlad Yasevich } 1422072017b4SVlad Yasevich 1423072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 1424cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1425cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 1426072017b4SVlad Yasevich { 1427cea8768fSMarcelo Ricardo Leitner struct sctp_chunk *chunk; 1428072017b4SVlad Yasevich 1429cea8768fSMarcelo Ricardo Leitner chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp); 1430072017b4SVlad Yasevich if (chunk) 1431072017b4SVlad Yasevich sctp_control_set_owner_w(chunk); 1432072017b4SVlad Yasevich 1433072017b4SVlad Yasevich return chunk; 1434072017b4SVlad Yasevich } 14351da177e4SLinus Torvalds 14361da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 14371da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 14381da177e4SLinus Torvalds { 1439a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1440a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1441a08de64dSVlad Yasevich 1442c485658bSDaniel Borkmann consume_skb(chunk->skb); 1443c485658bSDaniel Borkmann consume_skb(chunk->auth_chunk); 14441da177e4SLinus Torvalds 14451da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 14461da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 14471da177e4SLinus Torvalds } 14481da177e4SLinus Torvalds 14491da177e4SLinus Torvalds /* Possibly, free the chunk. */ 14501da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 14511da177e4SLinus Torvalds { 14521da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 14531da177e4SLinus Torvalds if (chunk->msg) 14541da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 14551da177e4SLinus Torvalds 14561da177e4SLinus Torvalds sctp_chunk_put(chunk); 14571da177e4SLinus Torvalds } 14581da177e4SLinus Torvalds 14591da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 14601da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 14611da177e4SLinus Torvalds { 14621da177e4SLinus Torvalds atomic_inc(&ch->refcnt); 14631da177e4SLinus Torvalds } 14641da177e4SLinus Torvalds 14651da177e4SLinus Torvalds /* Release a reference to the chunk. */ 14661da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 14671da177e4SLinus Torvalds { 14681da177e4SLinus Torvalds if (atomic_dec_and_test(&ch->refcnt)) 14691da177e4SLinus Torvalds sctp_chunk_destroy(ch); 14701da177e4SLinus Torvalds } 14711da177e4SLinus Torvalds 14721da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 14731da177e4SLinus Torvalds * enough. 14741da177e4SLinus Torvalds */ 14751da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 14761da177e4SLinus Torvalds { 14771da177e4SLinus Torvalds void *target; 14781da177e4SLinus Torvalds void *padding; 14791da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 1480e2f036a9SMarcelo Ricardo Leitner int padlen = SCTP_PAD4(chunklen) - chunklen; 14811da177e4SLinus Torvalds 14821da177e4SLinus Torvalds padding = skb_put(chunk->skb, padlen); 14831da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 14841da177e4SLinus Torvalds 14851da177e4SLinus Torvalds memset(padding, 0, padlen); 14861da177e4SLinus Torvalds memcpy(target, data, len); 14871da177e4SLinus Torvalds 14881da177e4SLinus Torvalds /* Adjust the chunk length field. */ 14891da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 149027a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 14911da177e4SLinus Torvalds 14921da177e4SLinus Torvalds return target; 14931da177e4SLinus Torvalds } 14941da177e4SLinus Torvalds 14955fa782c2SNeil Horman /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient 14965fa782c2SNeil Horman * space in the chunk 14975fa782c2SNeil Horman */ 14986daaf0deSstephen hemminger static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk, 14995fa782c2SNeil Horman int len, const void *data) 15005fa782c2SNeil Horman { 15012e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) >= len) 15025fa782c2SNeil Horman return sctp_addto_chunk(chunk, len, data); 15035fa782c2SNeil Horman else 15045fa782c2SNeil Horman return NULL; 15055fa782c2SNeil Horman } 15065fa782c2SNeil Horman 15071da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 15081da177e4SLinus Torvalds * chunk is not big enough. 15091da177e4SLinus Torvalds * Returns a kernel err value. 15101da177e4SLinus Torvalds */ 1511e0eb093eSAl Viro int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 1512e0eb093eSAl Viro struct iov_iter *from) 15131da177e4SLinus Torvalds { 1514e0eb093eSAl Viro void *target; 1515e0eb093eSAl Viro ssize_t copied; 15161da177e4SLinus Torvalds 15171da177e4SLinus Torvalds /* Make room in chunk for data. */ 15181da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 15191da177e4SLinus Torvalds 15201da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 1521e0eb093eSAl Viro copied = copy_from_iter(target, len, from); 1522e0eb093eSAl Viro if (copied != len) 1523e0eb093eSAl Viro return -EFAULT; 15241da177e4SLinus Torvalds 15251da177e4SLinus Torvalds /* Adjust the chunk length field. */ 15261da177e4SLinus Torvalds chunk->chunk_hdr->length = 15271da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 152827a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 15291da177e4SLinus Torvalds 1530e0eb093eSAl Viro return 0; 15311da177e4SLinus Torvalds } 15321da177e4SLinus Torvalds 15331da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15341da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15351da177e4SLinus Torvalds */ 15361da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 15371da177e4SLinus Torvalds { 1538ab3e5e7bSVlad Yasevich struct sctp_datamsg *msg; 1539ab3e5e7bSVlad Yasevich struct sctp_chunk *lchunk; 1540ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 15411da177e4SLinus Torvalds __u16 ssn; 15421da177e4SLinus Torvalds __u16 sid; 15431da177e4SLinus Torvalds 15441da177e4SLinus Torvalds if (chunk->has_ssn) 15451da177e4SLinus Torvalds return; 15461da177e4SLinus Torvalds 1547ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1548ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1549a8386317SXin Long stream = chunk->asoc->stream; 1550ab3e5e7bSVlad Yasevich 1551ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1552ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1553ab3e5e7bSVlad Yasevich */ 1554ab3e5e7bSVlad Yasevich msg = chunk->msg; 1555ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1556ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 15571da177e4SLinus Torvalds ssn = 0; 15581da177e4SLinus Torvalds } else { 1559ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1560a8386317SXin Long ssn = sctp_ssn_next(stream, out, sid); 15611da177e4SLinus Torvalds else 1562a8386317SXin Long ssn = sctp_ssn_peek(stream, out, sid); 15631da177e4SLinus Torvalds } 15641da177e4SLinus Torvalds 1565ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1566ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1567ab3e5e7bSVlad Yasevich } 15681da177e4SLinus Torvalds } 15691da177e4SLinus Torvalds 15701da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15711da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15721da177e4SLinus Torvalds */ 15731da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 15741da177e4SLinus Torvalds { 15751da177e4SLinus Torvalds if (!chunk->has_tsn) { 15761da177e4SLinus Torvalds /* This is the last possible instant to 15771da177e4SLinus Torvalds * assign a TSN. 15781da177e4SLinus Torvalds */ 15791da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 15801da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 15811da177e4SLinus Torvalds chunk->has_tsn = 1; 15821da177e4SLinus Torvalds } 15831da177e4SLinus Torvalds } 15841da177e4SLinus Torvalds 15851da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 15861da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 15873182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1588dd0fc66fSAl Viro gfp_t gfp) 15891da177e4SLinus Torvalds { 15901da177e4SLinus Torvalds struct sctp_association *asoc; 15911da177e4SLinus Torvalds struct sk_buff *skb; 15921da177e4SLinus Torvalds sctp_scope_t scope; 15931da177e4SLinus Torvalds 15941da177e4SLinus Torvalds /* Create the bare association. */ 15951da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 15961da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 15971da177e4SLinus Torvalds if (!asoc) 15981da177e4SLinus Torvalds goto nodata; 15991da177e4SLinus Torvalds asoc->temp = 1; 16001da177e4SLinus Torvalds skb = chunk->skb; 16011da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1602e7487c86SMarcelo Ricardo Leitner SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1); 1603e7487c86SMarcelo Ricardo Leitner 16041da177e4SLinus Torvalds nodata: 16051da177e4SLinus Torvalds return asoc; 16061da177e4SLinus Torvalds } 16071da177e4SLinus Torvalds 16081da177e4SLinus Torvalds /* Build a cookie representing asoc. 16091da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 16101da177e4SLinus Torvalds */ 16111da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 16121da177e4SLinus Torvalds const struct sctp_association *asoc, 16131da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 16141da177e4SLinus Torvalds int *cookie_len, 16151da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len) 16161da177e4SLinus Torvalds { 16171da177e4SLinus Torvalds sctp_cookie_param_t *retval; 16181da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 16191da177e4SLinus Torvalds int headersize, bodysize; 16201da177e4SLinus Torvalds 16219834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 16229834a2bbSVlad Yasevich * any padding. 16239834a2bbSVlad Yasevich */ 16249834a2bbSVlad Yasevich headersize = sizeof(sctp_paramhdr_t) + 16259834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 16269834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 16271da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 16281da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 16291da177e4SLinus Torvalds 16301da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 16311da177e4SLinus Torvalds * functions simpler to write. 16321da177e4SLinus Torvalds */ 16331da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 16341da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 16351da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 16361da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 16371da177e4SLinus Torvalds 16381da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 16391da177e4SLinus Torvalds * out on the network. 16401da177e4SLinus Torvalds */ 1641af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1642af997d8cSArnaldo Carvalho de Melo if (!retval) 1643af997d8cSArnaldo Carvalho de Melo goto nodata; 1644af997d8cSArnaldo Carvalho de Melo 16451da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 16461da177e4SLinus Torvalds 16471da177e4SLinus Torvalds /* Set up the parameter header. */ 16481da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 16491da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 16501da177e4SLinus Torvalds 16511da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 16521da177e4SLinus Torvalds cookie->c = asoc->c; 16531da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 16541da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 16551da177e4SLinus Torvalds 16561da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 16571da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 16581da177e4SLinus Torvalds 16590f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 16600f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 16611da177e4SLinus Torvalds 16621da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 166352db882fSDaniel Borkmann cookie->c.expiration = ktime_add(asoc->cookie_life, 1664cb5e173eSMarcelo Ricardo Leitner ktime_get_real()); 16651da177e4SLinus Torvalds 16661da177e4SLinus Torvalds /* Copy the peer's init packet. */ 16671da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 16681da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 16691da177e4SLinus Torvalds 16701da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 16711da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 16721da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 16731da177e4SLinus Torvalds 16741da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 16755821c769SHerbert Xu SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); 16765821c769SHerbert Xu int err; 16771b489e11SHerbert Xu 16781da177e4SLinus Torvalds /* Sign the message. */ 16795821c769SHerbert Xu desc->tfm = sctp_sk(ep->base.sk)->hmac; 16805821c769SHerbert Xu desc->flags = 0; 16811da177e4SLinus Torvalds 16825821c769SHerbert Xu err = crypto_shash_setkey(desc->tfm, ep->secret_key, 16835821c769SHerbert Xu sizeof(ep->secret_key)) ?: 16845821c769SHerbert Xu crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize, 16855821c769SHerbert Xu cookie->signature); 16865821c769SHerbert Xu shash_desc_zero(desc); 16875821c769SHerbert Xu if (err) 16881b489e11SHerbert Xu goto free_cookie; 16891da177e4SLinus Torvalds } 16901da177e4SLinus Torvalds 16911da177e4SLinus Torvalds return retval; 16921b489e11SHerbert Xu 16931b489e11SHerbert Xu free_cookie: 16941b489e11SHerbert Xu kfree(retval); 16951b489e11SHerbert Xu nodata: 16961b489e11SHerbert Xu *cookie_len = 0; 16971b489e11SHerbert Xu return NULL; 16981da177e4SLinus Torvalds } 16991da177e4SLinus Torvalds 17001da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 17011da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 17021da177e4SLinus Torvalds const struct sctp_endpoint *ep, 17031da177e4SLinus Torvalds const struct sctp_association *asoc, 1704dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 17051da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 17061da177e4SLinus Torvalds { 17071da177e4SLinus Torvalds struct sctp_association *retval = NULL; 17081da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 17091da177e4SLinus Torvalds struct sctp_cookie *bear_cookie; 17101da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1711313e7b4dSVlad Yasevich __u8 *digest = ep->digest; 1712570617e7SDaniel Borkmann unsigned int len; 17131da177e4SLinus Torvalds sctp_scope_t scope; 17141da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 171552db882fSDaniel Borkmann ktime_t kt; 17161da177e4SLinus Torvalds 17179834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 17189834a2bbSVlad Yasevich * any padding. 17199834a2bbSVlad Yasevich */ 17209834a2bbSVlad Yasevich headersize = sizeof(sctp_chunkhdr_t) + 17219834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 17229834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 17231da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 17241da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 17251da177e4SLinus Torvalds 17261da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 17271da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 17281da177e4SLinus Torvalds * INIT chunk. 17291da177e4SLinus Torvalds */ 17301da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17311da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 17321da177e4SLinus Torvalds goto malformed; 17331da177e4SLinus Torvalds 17341da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 17351da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 17361da177e4SLinus Torvalds goto malformed; 17371da177e4SLinus Torvalds 17381da177e4SLinus Torvalds /* Process the cookie. */ 17391da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 17401da177e4SLinus Torvalds bear_cookie = &cookie->c; 17411da177e4SLinus Torvalds 17421da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 17431da177e4SLinus Torvalds goto no_hmac; 17441da177e4SLinus Torvalds 17451da177e4SLinus Torvalds /* Check the signature. */ 17465821c769SHerbert Xu { 17475821c769SHerbert Xu SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); 17485821c769SHerbert Xu int err; 17491da177e4SLinus Torvalds 17505821c769SHerbert Xu desc->tfm = sctp_sk(ep->base.sk)->hmac; 17515821c769SHerbert Xu desc->flags = 0; 17525821c769SHerbert Xu 17535821c769SHerbert Xu err = crypto_shash_setkey(desc->tfm, ep->secret_key, 17545821c769SHerbert Xu sizeof(ep->secret_key)) ?: 17555821c769SHerbert Xu crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize, 17565821c769SHerbert Xu digest); 17575821c769SHerbert Xu shash_desc_zero(desc); 17585821c769SHerbert Xu 17595821c769SHerbert Xu if (err) { 17601b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17611b489e11SHerbert Xu goto fail; 17621b489e11SHerbert Xu } 17635821c769SHerbert Xu } 17641da177e4SLinus Torvalds 17651da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 17661da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 17671da177e4SLinus Torvalds goto fail; 17681da177e4SLinus Torvalds } 17691da177e4SLinus Torvalds 17701da177e4SLinus Torvalds no_hmac: 17711da177e4SLinus Torvalds /* IG Section 2.35.2: 17721da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 17731da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 17741da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 17751da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 17761da177e4SLinus Torvalds * discarded, 17771da177e4SLinus Torvalds */ 17781da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 17791da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 17801da177e4SLinus Torvalds goto fail; 17811da177e4SLinus Torvalds } 17821da177e4SLinus Torvalds 17839b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 17841da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 17851da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 17861da177e4SLinus Torvalds goto fail; 17871da177e4SLinus Torvalds } 17881da177e4SLinus Torvalds 17891da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 17901da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 17911da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1792f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1793f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1794f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1795f236218bSVlad Yasevich * down the new association establishment instead of every packet. 17961da177e4SLinus Torvalds */ 1797f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 179852db882fSDaniel Borkmann kt = skb_get_ktime(skb); 1799f236218bSVlad Yasevich else 1800cb5e173eSMarcelo Ricardo Leitner kt = ktime_get_real(); 1801f236218bSVlad Yasevich 180267cb9366SDaniel Borkmann if (!asoc && ktime_before(bear_cookie->expiration, kt)) { 18031da177e4SLinus Torvalds /* 18041da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 18051da177e4SLinus Torvalds * 18061da177e4SLinus Torvalds * Cause of error 18071da177e4SLinus Torvalds * --------------- 18081da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 18091da177e4SLinus Torvalds * Cookie that has expired. 18101da177e4SLinus Torvalds */ 18111da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 18121da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18131da177e4SLinus Torvalds if (*errp) { 181452db882fSDaniel Borkmann suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); 181534bcca28SAl Viro __be32 n = htonl(usecs); 18161da177e4SLinus Torvalds 18171da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, 181800f1c2dfSWei Yongjun sizeof(n)); 181900f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(n), &n); 18201da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 18211da177e4SLinus Torvalds } else 18221da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18231da177e4SLinus Torvalds 18241da177e4SLinus Torvalds goto fail; 18251da177e4SLinus Torvalds } 18261da177e4SLinus Torvalds 18271da177e4SLinus Torvalds /* Make a new base association. */ 18281da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 18291da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 18301da177e4SLinus Torvalds if (!retval) { 18311da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18321da177e4SLinus Torvalds goto fail; 18331da177e4SLinus Torvalds } 18341da177e4SLinus Torvalds 18351da177e4SLinus Torvalds /* Set up our peer's port number. */ 18361da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 18371da177e4SLinus Torvalds 18381da177e4SLinus Torvalds /* Populate the association from the cookie. */ 18391da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 18401da177e4SLinus Torvalds 18411da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 18421da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 18431da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18441da177e4SLinus Torvalds goto fail; 18451da177e4SLinus Torvalds } 18461da177e4SLinus Torvalds 18471da177e4SLinus Torvalds /* Also, add the destination address. */ 18481da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1849f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1850133800d1SMarcelo Ricardo Leitner sizeof(chunk->dest), SCTP_ADDR_SRC, 1851133800d1SMarcelo Ricardo Leitner GFP_ATOMIC); 18521da177e4SLinus Torvalds } 18531da177e4SLinus Torvalds 18541da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 18551da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 18561da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 1857cc16f00fSXin Long retval->strreset_outseq = retval->c.initial_tsn; 18581da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 18591da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 18600f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 18611da177e4SLinus Torvalds 18621da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 18631da177e4SLinus Torvalds return retval; 18641da177e4SLinus Torvalds 18651da177e4SLinus Torvalds fail: 18661da177e4SLinus Torvalds if (retval) 18671da177e4SLinus Torvalds sctp_association_free(retval); 18681da177e4SLinus Torvalds 18691da177e4SLinus Torvalds return NULL; 18701da177e4SLinus Torvalds 18711da177e4SLinus Torvalds malformed: 18721da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 18731da177e4SLinus Torvalds * malformed. 18741da177e4SLinus Torvalds */ 18751da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 18761da177e4SLinus Torvalds goto fail; 18771da177e4SLinus Torvalds } 18781da177e4SLinus Torvalds 18791da177e4SLinus Torvalds /******************************************************************** 18801da177e4SLinus Torvalds * 3rd Level Abstractions 18811da177e4SLinus Torvalds ********************************************************************/ 18821da177e4SLinus Torvalds 18831da177e4SLinus Torvalds struct __sctp_missing { 18849f81bcd9SAl Viro __be32 num_missing; 18859f81bcd9SAl Viro __be16 type; 1886bc10502dSEric Dumazet } __packed; 18871da177e4SLinus Torvalds 18881da177e4SLinus Torvalds /* 18891da177e4SLinus Torvalds * Report a missing mandatory parameter. 18901da177e4SLinus Torvalds */ 18911da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 18921da177e4SLinus Torvalds sctp_param_t paramtype, 18931da177e4SLinus Torvalds struct sctp_chunk *chunk, 18941da177e4SLinus Torvalds struct sctp_chunk **errp) 18951da177e4SLinus Torvalds { 18961da177e4SLinus Torvalds struct __sctp_missing report; 18971da177e4SLinus Torvalds __u16 len; 18981da177e4SLinus Torvalds 1899e2f036a9SMarcelo Ricardo Leitner len = SCTP_PAD4(sizeof(report)); 19001da177e4SLinus Torvalds 19011da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 19021da177e4SLinus Torvalds * returning multiple unknown parameters. 19031da177e4SLinus Torvalds */ 19041da177e4SLinus Torvalds if (!*errp) 19051da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19061da177e4SLinus Torvalds 19071da177e4SLinus Torvalds if (*errp) { 19081da177e4SLinus Torvalds report.num_missing = htonl(1); 19091da177e4SLinus Torvalds report.type = paramtype; 1910ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 191100f1c2dfSWei Yongjun sizeof(report)); 191200f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 19131da177e4SLinus Torvalds } 19141da177e4SLinus Torvalds 19151da177e4SLinus Torvalds /* Stop processing this chunk. */ 19161da177e4SLinus Torvalds return 0; 19171da177e4SLinus Torvalds } 19181da177e4SLinus Torvalds 19191da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 19201da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 19211da177e4SLinus Torvalds struct sctp_chunk *chunk, 19221da177e4SLinus Torvalds struct sctp_chunk **errp) 19231da177e4SLinus Torvalds { 19241da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 19251da177e4SLinus Torvalds 19261da177e4SLinus Torvalds if (!*errp) 19271da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 19281da177e4SLinus Torvalds 19291da177e4SLinus Torvalds if (*errp) 193000f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 19311da177e4SLinus Torvalds 19321da177e4SLinus Torvalds /* Stop processing this chunk. */ 19331da177e4SLinus Torvalds return 0; 19341da177e4SLinus Torvalds } 19351da177e4SLinus Torvalds 19361da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 19371da177e4SLinus Torvalds struct sctp_paramhdr *param, 19381da177e4SLinus Torvalds const struct sctp_chunk *chunk, 19391da177e4SLinus Torvalds struct sctp_chunk **errp) 19401da177e4SLinus Torvalds { 19417ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 19427ab90804SVlad Yasevich * not reported. 19437ab90804SVlad Yasevich */ 19447ab90804SVlad Yasevich if (*errp) 19457ab90804SVlad Yasevich sctp_chunk_free(*errp); 19467ab90804SVlad Yasevich 19471da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1948ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 19491da177e4SLinus Torvalds 19501da177e4SLinus Torvalds return 0; 19511da177e4SLinus Torvalds } 19521da177e4SLinus Torvalds 19531da177e4SLinus Torvalds 19541da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 19551da177e4SLinus Torvalds * send back an indicator to the peer. 19561da177e4SLinus Torvalds */ 19571da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 19581da177e4SLinus Torvalds union sctp_params param, 19591da177e4SLinus Torvalds struct sctp_chunk *chunk, 19601da177e4SLinus Torvalds struct sctp_chunk **errp) 19611da177e4SLinus Torvalds { 19621da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 19631da177e4SLinus Torvalds 19647ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 19657ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 19667ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 19677ab90804SVlad Yasevich * them in the ABORT. 19687ab90804SVlad Yasevich */ 19697ab90804SVlad Yasevich if (*errp) 19707ab90804SVlad Yasevich sctp_chunk_free(*errp); 19717ab90804SVlad Yasevich 19721da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19731da177e4SLinus Torvalds 197400f1c2dfSWei Yongjun if (*errp) { 197500f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); 197600f1c2dfSWei Yongjun sctp_addto_chunk(*errp, len, param.v); 197700f1c2dfSWei Yongjun } 19781da177e4SLinus Torvalds 19791da177e4SLinus Torvalds /* Stop processing this chunk. */ 19801da177e4SLinus Torvalds return 0; 19811da177e4SLinus Torvalds } 19821da177e4SLinus Torvalds 1983f53b5b09SEric W. Biederman static int sctp_verify_ext_param(struct net *net, union sctp_params param) 1984d6701191SVlad Yasevich { 1985d6701191SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 1986d6701191SVlad Yasevich int have_auth = 0; 1987d6701191SVlad Yasevich int have_asconf = 0; 1988d6701191SVlad Yasevich int i; 1989d6701191SVlad Yasevich 1990d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 1991d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 1992d6701191SVlad Yasevich case SCTP_CID_AUTH: 1993d6701191SVlad Yasevich have_auth = 1; 1994d6701191SVlad Yasevich break; 1995d6701191SVlad Yasevich case SCTP_CID_ASCONF: 1996d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 1997d6701191SVlad Yasevich have_asconf = 1; 1998d6701191SVlad Yasevich break; 1999d6701191SVlad Yasevich } 2000d6701191SVlad Yasevich } 2001d6701191SVlad Yasevich 2002d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 2003d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 2004d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 2005d6701191SVlad Yasevich * mode. 2006d6701191SVlad Yasevich */ 2007e1fc3b14SEric W. Biederman if (net->sctp.addip_noauth) 2008d6701191SVlad Yasevich return 1; 2009d6701191SVlad Yasevich 2010e1fc3b14SEric W. Biederman if (net->sctp.addip_enable && !have_auth && have_asconf) 2011d6701191SVlad Yasevich return 0; 2012d6701191SVlad Yasevich 2013d6701191SVlad Yasevich return 1; 2014d6701191SVlad Yasevich } 2015d6701191SVlad Yasevich 2016131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 2017131a47e3SVlad Yasevich union sctp_params param) 2018131a47e3SVlad Yasevich { 2019e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 2020131a47e3SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 2021131a47e3SVlad Yasevich int i; 2022131a47e3SVlad Yasevich 2023131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 2024131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 2025c28445c3SXin Long case SCTP_CID_RECONF: 2026c28445c3SXin Long if (asoc->reconf_enable && 2027c28445c3SXin Long !asoc->peer.reconf_capable) 2028c28445c3SXin Long asoc->peer.reconf_capable = 1; 2029c28445c3SXin Long break; 2030131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 203128aa4c26SXin Long if (asoc->prsctp_enable && !asoc->peer.prsctp_capable) 2032131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 2033131a47e3SVlad Yasevich break; 2034730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 2035730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 2036730fc3d0SVlad Yasevich * supports AUTH. 2037730fc3d0SVlad Yasevich */ 2038b14878ccSVlad Yasevich if (asoc->ep->auth_enable) 2039730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 2040730fc3d0SVlad Yasevich break; 2041131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 2042131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 2043e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 204488799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 20456b2f9cb6SVlad Yasevich break; 2046131a47e3SVlad Yasevich default: 2047131a47e3SVlad Yasevich break; 2048131a47e3SVlad Yasevich } 2049131a47e3SVlad Yasevich } 2050131a47e3SVlad Yasevich } 2051131a47e3SVlad Yasevich 20521da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 20531da177e4SLinus Torvalds * 20541da177e4SLinus Torvalds * The Parameter Types are encoded such that the 20551da177e4SLinus Torvalds * highest-order two bits specify the action that must be 20561da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 20571da177e4SLinus Torvalds * Parameter Type. 20581da177e4SLinus Torvalds * 20597ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 20607ab90804SVlad Yasevich * parameters within this chunk 20611da177e4SLinus Torvalds * 20627ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 20637ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 20647ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 20651da177e4SLinus Torvalds * 20661da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 20671da177e4SLinus Torvalds * 20681da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 20691da177e4SLinus Torvalds * report the unrecognized parameter in an 20707ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 20711da177e4SLinus Torvalds * 20721da177e4SLinus Torvalds * Return value: 20737ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20747ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 20757ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 20761da177e4SLinus Torvalds */ 20777ab90804SVlad Yasevich static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc, 20781da177e4SLinus Torvalds union sctp_params param, 20791da177e4SLinus Torvalds struct sctp_chunk *chunk, 20801da177e4SLinus Torvalds struct sctp_chunk **errp) 20811da177e4SLinus Torvalds { 20827ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 20831da177e4SLinus Torvalds 20841da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 20851da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 20867ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20871da177e4SLinus Torvalds break; 20881da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 20891da177e4SLinus Torvalds break; 20907ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 20917ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20927ab90804SVlad Yasevich /* Fall through */ 20931da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 20941da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 20951da177e4SLinus Torvalds * returning multiple unknown parameters. 20961da177e4SLinus Torvalds */ 20971da177e4SLinus Torvalds if (NULL == *errp) 20985fa782c2SNeil Horman *errp = sctp_make_op_error_fixed(asoc, chunk); 20991da177e4SLinus Torvalds 21001da177e4SLinus Torvalds if (*errp) { 21012205a6eaSJiri Bohac if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM, 2102e2f036a9SMarcelo Ricardo Leitner SCTP_PAD4(ntohs(param.p->length)))) 21035fa782c2SNeil Horman sctp_addto_chunk_fixed(*errp, 2104e2f036a9SMarcelo Ricardo Leitner SCTP_PAD4(ntohs(param.p->length)), 210500f1c2dfSWei Yongjun param.v); 21061da177e4SLinus Torvalds } else { 21071da177e4SLinus Torvalds /* If there is no memory for generating the ERROR 21081da177e4SLinus Torvalds * report as specified, an ABORT will be triggered 21091da177e4SLinus Torvalds * to the peer and the association won't be 21101da177e4SLinus Torvalds * established. 21111da177e4SLinus Torvalds */ 21127ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 21131da177e4SLinus Torvalds } 21141da177e4SLinus Torvalds break; 21151da177e4SLinus Torvalds default: 21161da177e4SLinus Torvalds break; 21171da177e4SLinus Torvalds } 21181da177e4SLinus Torvalds 21191da177e4SLinus Torvalds return retval; 21201da177e4SLinus Torvalds } 21211da177e4SLinus Torvalds 21227ab90804SVlad Yasevich /* Verify variable length parameters 21231da177e4SLinus Torvalds * Return values: 21247ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 21257ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 21267ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 21277ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 21281da177e4SLinus Torvalds */ 2129f53b5b09SEric W. Biederman static sctp_ierror_t sctp_verify_param(struct net *net, 2130b14878ccSVlad Yasevich const struct sctp_endpoint *ep, 2131f53b5b09SEric W. Biederman const struct sctp_association *asoc, 21321da177e4SLinus Torvalds union sctp_params param, 21331da177e4SLinus Torvalds sctp_cid_t cid, 21341da177e4SLinus Torvalds struct sctp_chunk *chunk, 21351da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 21361da177e4SLinus Torvalds { 213772da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 21387ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 213972da7b38SWei Yongjun __u16 n_elt, id = 0; 214072da7b38SWei Yongjun int i; 21411da177e4SLinus Torvalds 21421da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 21431da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 21441da177e4SLinus Torvalds * identified based on the chunk id. 21451da177e4SLinus Torvalds */ 21461da177e4SLinus Torvalds 21471da177e4SLinus Torvalds switch (param.p->type) { 21481da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 21491da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 21501da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 21511da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 21521da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 21531da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 21541da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 21551da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 21560f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2157d6701191SVlad Yasevich break; 2158d6701191SVlad Yasevich 2159131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2160f53b5b09SEric W. Biederman if (!sctp_verify_ext_param(net, param)) 2161d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 21621da177e4SLinus Torvalds break; 21631da177e4SLinus Torvalds 2164d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2165e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 2166d6de3097SVlad Yasevich break; 2167d6de3097SVlad Yasevich goto fallthrough; 2168d6de3097SVlad Yasevich 21691da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 21701da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 21717ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 21727ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21737ab90804SVlad Yasevich break; 2174131a47e3SVlad Yasevich 21751da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 217628aa4c26SXin Long if (ep->prsctp_enable) 21771da177e4SLinus Torvalds break; 2178730fc3d0SVlad Yasevich goto fallthrough; 2179730fc3d0SVlad Yasevich 2180730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2181b14878ccSVlad Yasevich if (!ep->auth_enable) 2182730fc3d0SVlad Yasevich goto fallthrough; 2183730fc3d0SVlad Yasevich 2184730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2185730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2186730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2187730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2188730fc3d0SVlad Yasevich */ 2189730fc3d0SVlad Yasevich if (SCTP_AUTH_RANDOM_LENGTH != 21907ab90804SVlad Yasevich ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) { 21917ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2192730fc3d0SVlad Yasevich chunk, err_chunk); 21937ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21947ab90804SVlad Yasevich } 2195730fc3d0SVlad Yasevich break; 2196730fc3d0SVlad Yasevich 2197730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2198b14878ccSVlad Yasevich if (!ep->auth_enable) 2199730fc3d0SVlad Yasevich goto fallthrough; 2200730fc3d0SVlad Yasevich 2201730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2202730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2203730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2204730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2205730fc3d0SVlad Yasevich */ 22067ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 22077ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2208730fc3d0SVlad Yasevich chunk, err_chunk); 22097ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 22107ab90804SVlad Yasevich } 2211730fc3d0SVlad Yasevich break; 2212730fc3d0SVlad Yasevich 2213730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2214b14878ccSVlad Yasevich if (!ep->auth_enable) 221572da7b38SWei Yongjun goto fallthrough; 221672da7b38SWei Yongjun 221772da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 221872da7b38SWei Yongjun n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1; 221972da7b38SWei Yongjun 222072da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 222172da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 222272da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 222372da7b38SWei Yongjun */ 222472da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 222572da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 222672da7b38SWei Yongjun 222772da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2228730fc3d0SVlad Yasevich break; 222972da7b38SWei Yongjun } 223072da7b38SWei Yongjun 223172da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 223272da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 223372da7b38SWei Yongjun err_chunk); 223472da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 223572da7b38SWei Yongjun } 223672da7b38SWei Yongjun break; 2237730fc3d0SVlad Yasevich fallthrough: 22381da177e4SLinus Torvalds default: 2239bb33381dSDaniel Borkmann pr_debug("%s: unrecognized param:%d for chunk:%d\n", 2240bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), cid); 2241bb33381dSDaniel Borkmann 22427ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 22431da177e4SLinus Torvalds break; 22441da177e4SLinus Torvalds } 22451da177e4SLinus Torvalds return retval; 22461da177e4SLinus Torvalds } 22471da177e4SLinus Torvalds 22481da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 2249b14878ccSVlad Yasevich int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 2250b14878ccSVlad Yasevich const struct sctp_association *asoc, sctp_cid_t cid, 2251b14878ccSVlad Yasevich sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, 22521da177e4SLinus Torvalds struct sctp_chunk **errp) 22531da177e4SLinus Torvalds { 22541da177e4SLinus Torvalds union sctp_params param; 22557613f5feSDaniel Borkmann bool has_cookie = false; 22567ab90804SVlad Yasevich int result; 22571da177e4SLinus Torvalds 22587613f5feSDaniel Borkmann /* Check for missing mandatory parameters. Note: Initial TSN is 22597613f5feSDaniel Borkmann * also mandatory, but is not checked here since the valid range 22607613f5feSDaniel Borkmann * is 0..2**32-1. RFC4960, section 3.3.3. 22617613f5feSDaniel Borkmann */ 22627613f5feSDaniel Borkmann if (peer_init->init_hdr.num_outbound_streams == 0 || 22637613f5feSDaniel Borkmann peer_init->init_hdr.num_inbound_streams == 0 || 22647613f5feSDaniel Borkmann peer_init->init_hdr.init_tag == 0 || 22657613f5feSDaniel Borkmann ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) 22667ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 22671da177e4SLinus Torvalds 22681da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22697613f5feSDaniel Borkmann if (param.p->type == SCTP_PARAM_STATE_COOKIE) 22707613f5feSDaniel Borkmann has_cookie = true; 22717613f5feSDaniel Borkmann } 22721da177e4SLinus Torvalds 22731da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 22741da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 22751da177e4SLinus Torvalds * The current param.p would point at the bad one. 22761da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 22771da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 22781da177e4SLinus Torvalds * error handling code build and send the packet. 22791da177e4SLinus Torvalds */ 22807ab90804SVlad Yasevich if (param.v != (void *)chunk->chunk_end) 22817ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 22821da177e4SLinus Torvalds 22831da177e4SLinus Torvalds /* The only missing mandatory param possible today is 22841da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 22851da177e4SLinus Torvalds */ 22867ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 22877ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 22881da177e4SLinus Torvalds chunk, errp); 22891da177e4SLinus Torvalds 22907ab90804SVlad Yasevich /* Verify all the variable length parameters */ 22911da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2292b14878ccSVlad Yasevich result = sctp_verify_param(net, ep, asoc, param, cid, 2293b14878ccSVlad Yasevich chunk, errp); 22947ab90804SVlad Yasevich switch (result) { 22957ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 22967ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 22971da177e4SLinus Torvalds return 0; 22987ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 22991da177e4SLinus Torvalds return 1; 23007ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 23017ab90804SVlad Yasevich default: 23027ab90804SVlad Yasevich break; 23031da177e4SLinus Torvalds } 23041da177e4SLinus Torvalds 23051da177e4SLinus Torvalds } /* for (loop through all parameters) */ 23061da177e4SLinus Torvalds 23071da177e4SLinus Torvalds return 1; 23081da177e4SLinus Torvalds } 23091da177e4SLinus Torvalds 23101da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 23111da177e4SLinus Torvalds * Returns 0 on failure, else success. 23121da177e4SLinus Torvalds * FIXME: This is an association method. 23131da177e4SLinus Torvalds */ 2314de6becdcSWei Yongjun int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, 23151da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2316dd0fc66fSAl Viro sctp_init_chunk_t *peer_init, gfp_t gfp) 23171da177e4SLinus Torvalds { 2318e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 23191da177e4SLinus Torvalds union sctp_params param; 23201da177e4SLinus Torvalds struct sctp_transport *transport; 23211da177e4SLinus Torvalds struct list_head *pos, *temp; 2322de6becdcSWei Yongjun struct sctp_af *af; 2323de6becdcSWei Yongjun union sctp_addr addr; 23241da177e4SLinus Torvalds char *cookie; 2325de6becdcSWei Yongjun int src_match = 0; 23261da177e4SLinus Torvalds 23271da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 23281da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 23291da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 23301da177e4SLinus Torvalds * of the INIT from the cookie. 23311da177e4SLinus Torvalds */ 23321da177e4SLinus Torvalds 23331da177e4SLinus Torvalds /* This implementation defaults to making the first transport 23341da177e4SLinus Torvalds * added as the primary transport. The source address seems to 23351da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 23361da177e4SLinus Torvalds */ 23376a1e5f33SAl Viro if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 23381da177e4SLinus Torvalds goto nomem; 2339de6becdcSWei Yongjun 2340de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) 2341de6becdcSWei Yongjun src_match = 1; 23421da177e4SLinus Torvalds 23431da177e4SLinus Torvalds /* Process the initialization parameters. */ 23441da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2345de6becdcSWei Yongjun if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 2346de6becdcSWei Yongjun param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { 2347de6becdcSWei Yongjun af = sctp_get_af_specific(param_type2af(param.p->type)); 2348de6becdcSWei Yongjun af->from_addr_param(&addr, param.addr, 2349de6becdcSWei Yongjun chunk->sctp_hdr->source, 0); 2350de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) 2351de6becdcSWei Yongjun src_match = 1; 2352de6becdcSWei Yongjun } 23531da177e4SLinus Torvalds 23541da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 23551da177e4SLinus Torvalds goto clean_up; 23561da177e4SLinus Torvalds } 23571da177e4SLinus Torvalds 2358de6becdcSWei Yongjun /* source address of chunk may not match any valid address */ 2359de6becdcSWei Yongjun if (!src_match) 2360de6becdcSWei Yongjun goto clean_up; 2361de6becdcSWei Yongjun 2362730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2363730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2364730fc3d0SVlad Yasevich */ 2365730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2366730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2367730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2368730fc3d0SVlad Yasevich 2369d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2370d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2371d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2372d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2373d6701191SVlad Yasevich * is what we'll do here. 23746b2f9cb6SVlad Yasevich */ 2375e1fc3b14SEric W. Biederman if (!net->sctp.addip_noauth && 237673d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 23776b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 23786b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 23796b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 238088799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2381d6701191SVlad Yasevich goto clean_up; 23826b2f9cb6SVlad Yasevich } 23836b2f9cb6SVlad Yasevich 23843f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 23853f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 23863f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 23873f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 23883f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 23893f7a87d2SFrank Filz } 23903f7a87d2SFrank Filz } 23913f7a87d2SFrank Filz 23921da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 23931da177e4SLinus Torvalds * order. 23941da177e4SLinus Torvalds */ 23951da177e4SLinus Torvalds asoc->peer.i.init_tag = 23961da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 23971da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 23981da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 23991da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 24001da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 24011da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 24021da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 24031da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 24041da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 24051da177e4SLinus Torvalds 2406cc16f00fSXin Long asoc->strreset_inseq = asoc->peer.i.initial_tsn; 2407cc16f00fSXin Long 24081da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 24091da177e4SLinus Torvalds * number of inbound streams. 24101da177e4SLinus Torvalds */ 24111da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 24121da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 24131da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 24141da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 24151da177e4SLinus Torvalds } 24161da177e4SLinus Torvalds 24171da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 24181da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 24191da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 24201da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 24211da177e4SLinus Torvalds } 24221da177e4SLinus Torvalds 24231da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 24241da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 24251da177e4SLinus Torvalds 24261da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 24271da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 24281da177e4SLinus Torvalds 24291da177e4SLinus Torvalds /* Copy cookie in case we need to resend COOKIE-ECHO. */ 24301da177e4SLinus Torvalds cookie = asoc->peer.cookie; 24311da177e4SLinus Torvalds if (cookie) { 2432af997d8cSArnaldo Carvalho de Melo asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); 24331da177e4SLinus Torvalds if (!asoc->peer.cookie) 24341da177e4SLinus Torvalds goto clean_up; 24351da177e4SLinus Torvalds } 24361da177e4SLinus Torvalds 24371da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 24381da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 24391da177e4SLinus Torvalds * advertised window). 24401da177e4SLinus Torvalds */ 24419dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 24429dbc15f0SRobert P. J. Day transports) { 24431da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 24441da177e4SLinus Torvalds } 24451da177e4SLinus Torvalds 24461da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 24478e1ee18cSVlad Yasevich if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 24488e1ee18cSVlad Yasevich asoc->peer.i.initial_tsn, gfp)) 24498e1ee18cSVlad Yasevich goto clean_up; 24501da177e4SLinus Torvalds 24511da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 24521da177e4SLinus Torvalds * 24531da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 24541da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 24551da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 24561da177e4SLinus Torvalds * stream sequence number shall be set to 0. 24571da177e4SLinus Torvalds */ 24581da177e4SLinus Torvalds 24593f7a87d2SFrank Filz /* Allocate storage for the negotiated streams if it is not a temporary 24603f7a87d2SFrank Filz * association. 24611da177e4SLinus Torvalds */ 24621da177e4SLinus Torvalds if (!asoc->temp) { 24631da177e4SLinus Torvalds int error; 24641da177e4SLinus Torvalds 2465a8386317SXin Long asoc->stream = sctp_stream_new(asoc->c.sinit_max_instreams, 24661da177e4SLinus Torvalds asoc->c.sinit_num_ostreams, gfp); 2467a8386317SXin Long if (!asoc->stream) 24681da177e4SLinus Torvalds goto clean_up; 24691da177e4SLinus Torvalds 247007d93967SVlad Yasevich error = sctp_assoc_set_id(asoc, gfp); 247107d93967SVlad Yasevich if (error) 24721da177e4SLinus Torvalds goto clean_up; 24731da177e4SLinus Torvalds } 24741da177e4SLinus Torvalds 24751da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 24761da177e4SLinus Torvalds * 24771da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 24781da177e4SLinus Torvalds * remote endpoint it should do the following: 24791da177e4SLinus Torvalds * ... 24801da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 24811da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 24821da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 24831da177e4SLinus Torvalds * association to the same value as the Initial TSN. 24841da177e4SLinus Torvalds */ 24851da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 24861da177e4SLinus Torvalds return 1; 24871da177e4SLinus Torvalds 24881da177e4SLinus Torvalds clean_up: 24891da177e4SLinus Torvalds /* Release the transport structures. */ 24901da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 24911da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2492add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2493add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 24941da177e4SLinus Torvalds } 24953f7a87d2SFrank Filz 24961da177e4SLinus Torvalds nomem: 24971da177e4SLinus Torvalds return 0; 24981da177e4SLinus Torvalds } 24991da177e4SLinus Torvalds 25001da177e4SLinus Torvalds 25011da177e4SLinus Torvalds /* Update asoc with the option described in param. 25021da177e4SLinus Torvalds * 25031da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 25041da177e4SLinus Torvalds * 25051da177e4SLinus Torvalds * asoc is the association to update. 25061da177e4SLinus Torvalds * param is the variable length parameter to use for update. 25071da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 25081da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 25091da177e4SLinus Torvalds * work we do. In particular, we should not build transport 25101da177e4SLinus Torvalds * structures for the addresses. 25111da177e4SLinus Torvalds */ 25121da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 25131da177e4SLinus Torvalds union sctp_params param, 25141da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2515dd0fc66fSAl Viro gfp_t gfp) 25161da177e4SLinus Torvalds { 2517e7ff4a70SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 25181da177e4SLinus Torvalds union sctp_addr addr; 25191da177e4SLinus Torvalds int i; 25201da177e4SLinus Torvalds __u16 sat; 25211da177e4SLinus Torvalds int retval = 1; 25221da177e4SLinus Torvalds sctp_scope_t scope; 25233ef0a25bSArnd Bergmann u32 stale; 25241da177e4SLinus Torvalds struct sctp_af *af; 2525d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 2526d6de3097SVlad Yasevich struct sctp_transport *t; 2527b14878ccSVlad Yasevich struct sctp_endpoint *ep = asoc->ep; 25281da177e4SLinus Torvalds 25291da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 25301da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 25311da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 25321da177e4SLinus Torvalds */ 25331da177e4SLinus Torvalds switch (param.p->type) { 25341da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25351da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 25361da177e4SLinus Torvalds break; 25377dab83deSVlad Yasevich goto do_addr_param; 25387dab83deSVlad Yasevich 25391da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25407dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 25417dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 25427dab83deSVlad Yasevich break; 25437dab83deSVlad Yasevich do_addr_param: 25441da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2545dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 25461da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2547e7ff4a70SEric W. Biederman if (sctp_in_scope(net, &addr, scope)) 2548dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 25491da177e4SLinus Torvalds return 0; 25501da177e4SLinus Torvalds break; 25511da177e4SLinus Torvalds 25521da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 2553e1fc3b14SEric W. Biederman if (!net->sctp.cookie_preserve_enable) 25541da177e4SLinus Torvalds break; 25551da177e4SLinus Torvalds 25561da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 25571da177e4SLinus Torvalds 25581da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 25591da177e4SLinus Torvalds * (1/1000sec). 25601da177e4SLinus Torvalds */ 256152db882fSDaniel Borkmann asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); 25621da177e4SLinus Torvalds break; 25631da177e4SLinus Torvalds 25641da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 2565bb33381dSDaniel Borkmann pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); 25661da177e4SLinus Torvalds break; 25671da177e4SLinus Torvalds 25681da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 25691da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 25701da177e4SLinus Torvalds * ones are really set by the peer. 25711da177e4SLinus Torvalds */ 25721da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 25731da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 25741da177e4SLinus Torvalds 2575140ee960SGui Jianfeng /* Assume that peer supports the address family 2576140ee960SGui Jianfeng * by which it sends a packet. 2577140ee960SGui Jianfeng */ 2578140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2579140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2580140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2581140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2582140ee960SGui Jianfeng 25831da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 25841da177e4SLinus Torvalds sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 25851da177e4SLinus Torvalds if (sat) 25861da177e4SLinus Torvalds sat /= sizeof(__u16); 25871da177e4SLinus Torvalds 25881da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 25891da177e4SLinus Torvalds switch (param.sat->types[i]) { 25901da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25911da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 25921da177e4SLinus Torvalds break; 25931da177e4SLinus Torvalds 25941da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25956e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 25961da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 25971da177e4SLinus Torvalds break; 25981da177e4SLinus Torvalds 25991da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 26001da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 26011da177e4SLinus Torvalds break; 26021da177e4SLinus Torvalds 26031da177e4SLinus Torvalds default: /* Just ignore anything else. */ 26041da177e4SLinus Torvalds break; 26053ff50b79SStephen Hemminger } 26061da177e4SLinus Torvalds } 26071da177e4SLinus Torvalds break; 26081da177e4SLinus Torvalds 26091da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 26101da177e4SLinus Torvalds asoc->peer.cookie_len = 26111da177e4SLinus Torvalds ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 26121da177e4SLinus Torvalds asoc->peer.cookie = param.cookie->body; 26131da177e4SLinus Torvalds break; 26141da177e4SLinus Torvalds 26151da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 26161da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 26171da177e4SLinus Torvalds break; 26181da177e4SLinus Torvalds 26191da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 26201da177e4SLinus Torvalds /* Rejected during verify stage. */ 26211da177e4SLinus Torvalds break; 26221da177e4SLinus Torvalds 26231da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 26241da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 26251da177e4SLinus Torvalds break; 26261da177e4SLinus Torvalds 26270f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2628e69c4e0fSVlad Yasevich asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); 26291da177e4SLinus Torvalds break; 26301da177e4SLinus Torvalds 2631d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2632e1fc3b14SEric W. Biederman if (!net->sctp.addip_enable) 26330ef46e28SVlad Yasevich goto fall_through; 26340ef46e28SVlad Yasevich 2635d6de3097SVlad Yasevich addr_param = param.v + sizeof(sctp_addip_param_t); 2636d6de3097SVlad Yasevich 2637cfbf654eSSaran Maruti Ramanara af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 2638e40607cbSDaniel Borkmann if (af == NULL) 2639e40607cbSDaniel Borkmann break; 2640e40607cbSDaniel Borkmann 2641d6de3097SVlad Yasevich af->from_addr_param(&addr, addr_param, 2642d6de3097SVlad Yasevich htons(asoc->peer.port), 0); 2643d6de3097SVlad Yasevich 2644d6de3097SVlad Yasevich /* if the address is invalid, we can't process it. 2645d6de3097SVlad Yasevich * XXX: see spec for what to do. 2646d6de3097SVlad Yasevich */ 2647d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2648d6de3097SVlad Yasevich break; 2649d6de3097SVlad Yasevich 2650d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2651d6de3097SVlad Yasevich if (!t) 2652d6de3097SVlad Yasevich break; 2653d6de3097SVlad Yasevich 2654d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2655d6de3097SVlad Yasevich break; 2656d6de3097SVlad Yasevich 2657131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2658131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2659131a47e3SVlad Yasevich break; 2660131a47e3SVlad Yasevich 26611da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 266228aa4c26SXin Long if (asoc->prsctp_enable) { 26631da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 26641da177e4SLinus Torvalds break; 26651da177e4SLinus Torvalds } 26661da177e4SLinus Torvalds /* Fall Through */ 2667730fc3d0SVlad Yasevich goto fall_through; 2668730fc3d0SVlad Yasevich 2669730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2670b14878ccSVlad Yasevich if (!ep->auth_enable) 2671730fc3d0SVlad Yasevich goto fall_through; 2672730fc3d0SVlad Yasevich 2673730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2674730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2675730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2676730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2677730fc3d0SVlad Yasevich retval = 0; 2678730fc3d0SVlad Yasevich break; 2679730fc3d0SVlad Yasevich } 2680730fc3d0SVlad Yasevich break; 2681730fc3d0SVlad Yasevich 2682730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2683b14878ccSVlad Yasevich if (!ep->auth_enable) 2684730fc3d0SVlad Yasevich goto fall_through; 2685730fc3d0SVlad Yasevich 2686730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2687730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2688730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2689730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2690730fc3d0SVlad Yasevich retval = 0; 2691730fc3d0SVlad Yasevich break; 2692730fc3d0SVlad Yasevich } 2693730fc3d0SVlad Yasevich 2694730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2695730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2696730fc3d0SVlad Yasevich break; 2697730fc3d0SVlad Yasevich 2698730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2699b14878ccSVlad Yasevich if (!ep->auth_enable) 2700730fc3d0SVlad Yasevich goto fall_through; 2701730fc3d0SVlad Yasevich 2702730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2703730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2704730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2705730fc3d0SVlad Yasevich retval = 0; 2706730fc3d0SVlad Yasevich break; 2707730fc3d0SVlad Yasevich fall_through: 27081da177e4SLinus Torvalds default: 27091da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 27101da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 27111da177e4SLinus Torvalds * called prior to this routine. Simply log the error 27121da177e4SLinus Torvalds * here. 27131da177e4SLinus Torvalds */ 2714bb33381dSDaniel Borkmann pr_debug("%s: ignoring param:%d for association:%p.\n", 2715bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), asoc); 27161da177e4SLinus Torvalds break; 27173ff50b79SStephen Hemminger } 27181da177e4SLinus Torvalds 27191da177e4SLinus Torvalds return retval; 27201da177e4SLinus Torvalds } 27211da177e4SLinus Torvalds 27221da177e4SLinus Torvalds /* Select a new verification tag. */ 27231da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 27241da177e4SLinus Torvalds { 27251da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 27261da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 27271da177e4SLinus Torvalds */ 27281da177e4SLinus Torvalds __u32 x; 27291da177e4SLinus Torvalds 27301da177e4SLinus Torvalds do { 27311da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 27321da177e4SLinus Torvalds } while (x == 0); 27331da177e4SLinus Torvalds 27341da177e4SLinus Torvalds return x; 27351da177e4SLinus Torvalds } 27361da177e4SLinus Torvalds 27371da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 27381da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 27391da177e4SLinus Torvalds { 27401da177e4SLinus Torvalds __u32 retval; 27411da177e4SLinus Torvalds 27421da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 27431da177e4SLinus Torvalds return retval; 27441da177e4SLinus Torvalds } 27451da177e4SLinus Torvalds 27461da177e4SLinus Torvalds /* 27471da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 27481da177e4SLinus Torvalds * 0 1 2 3 27491da177e4SLinus 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 27501da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27511da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 27521da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27531da177e4SLinus Torvalds * | Serial Number | 27541da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27551da177e4SLinus Torvalds * | Address Parameter | 27561da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27571da177e4SLinus Torvalds * | ASCONF Parameter #1 | 27581da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27591da177e4SLinus Torvalds * \ \ 27601da177e4SLinus Torvalds * / .... / 27611da177e4SLinus Torvalds * \ \ 27621da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27631da177e4SLinus Torvalds * | ASCONF Parameter #N | 27641da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27651da177e4SLinus Torvalds * 27661da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 27671da177e4SLinus Torvalds */ 27681da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 27691da177e4SLinus Torvalds union sctp_addr *addr, 27701da177e4SLinus Torvalds int vparam_len) 27711da177e4SLinus Torvalds { 27721da177e4SLinus Torvalds sctp_addiphdr_t asconf; 27731da177e4SLinus Torvalds struct sctp_chunk *retval; 27741da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 27751da177e4SLinus Torvalds union sctp_addr_param addrparam; 27761da177e4SLinus Torvalds int addrlen; 27771da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 27781da177e4SLinus Torvalds 27791da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 27801da177e4SLinus Torvalds if (!addrlen) 27811da177e4SLinus Torvalds return NULL; 27821da177e4SLinus Torvalds length += addrlen; 27831da177e4SLinus Torvalds 27841da177e4SLinus Torvalds /* Create the chunk. */ 2785cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length, 2786cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 27871da177e4SLinus Torvalds if (!retval) 27881da177e4SLinus Torvalds return NULL; 27891da177e4SLinus Torvalds 27901da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 27911da177e4SLinus Torvalds 27921da177e4SLinus Torvalds retval->subh.addip_hdr = 27931da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 27941da177e4SLinus Torvalds retval->param_hdr.v = 27951da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 27961da177e4SLinus Torvalds 27971da177e4SLinus Torvalds return retval; 27981da177e4SLinus Torvalds } 27991da177e4SLinus Torvalds 28001da177e4SLinus Torvalds /* ADDIP 28011da177e4SLinus Torvalds * 3.2.1 Add IP Address 28021da177e4SLinus Torvalds * 0 1 2 3 28031da177e4SLinus 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 28041da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28051da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 28061da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28071da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28081da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28091da177e4SLinus Torvalds * | Address Parameter | 28101da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28111da177e4SLinus Torvalds * 28121da177e4SLinus Torvalds * 3.2.2 Delete IP Address 28131da177e4SLinus Torvalds * 0 1 2 3 28141da177e4SLinus 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 28151da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28161da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 28171da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28181da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28191da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28201da177e4SLinus Torvalds * | Address Parameter | 28211da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28221da177e4SLinus Torvalds * 28231da177e4SLinus Torvalds */ 28241da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 28251da177e4SLinus Torvalds union sctp_addr *laddr, 28261da177e4SLinus Torvalds struct sockaddr *addrs, 28271da177e4SLinus Torvalds int addrcnt, 2828dbc16db1SAl Viro __be16 flags) 28291da177e4SLinus Torvalds { 28301da177e4SLinus Torvalds sctp_addip_param_t param; 28311da177e4SLinus Torvalds struct sctp_chunk *retval; 28321da177e4SLinus Torvalds union sctp_addr_param addr_param; 28331da177e4SLinus Torvalds union sctp_addr *addr; 28341da177e4SLinus Torvalds void *addr_buf; 28351da177e4SLinus Torvalds struct sctp_af *af; 28361da177e4SLinus Torvalds int paramlen = sizeof(param); 28371da177e4SLinus Torvalds int addr_param_len = 0; 28381da177e4SLinus Torvalds int totallen = 0; 28391da177e4SLinus Torvalds int i; 28408a07eb0aSMichio Honda int del_pickup = 0; 28411da177e4SLinus Torvalds 28421da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 28431da177e4SLinus Torvalds addr_buf = addrs; 28441da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2845ea110733SJoe Perches addr = addr_buf; 28461da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28471da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28481da177e4SLinus Torvalds 28491da177e4SLinus Torvalds totallen += paramlen; 28501da177e4SLinus Torvalds totallen += addr_param_len; 28511da177e4SLinus Torvalds 28521da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28538a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending && !del_pickup) { 28548a07eb0aSMichio Honda /* reuse the parameter length from the same scope one */ 28558a07eb0aSMichio Honda totallen += paramlen; 28568a07eb0aSMichio Honda totallen += addr_param_len; 28578a07eb0aSMichio Honda del_pickup = 1; 2858bb33381dSDaniel Borkmann 2859bb33381dSDaniel Borkmann pr_debug("%s: picked same-scope del_pending addr, " 2860bb33381dSDaniel Borkmann "totallen for all addresses is %d\n", 2861bb33381dSDaniel Borkmann __func__, totallen); 28628a07eb0aSMichio Honda } 28631da177e4SLinus Torvalds } 28641da177e4SLinus Torvalds 28651da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 28661da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 28671da177e4SLinus Torvalds if (!retval) 28681da177e4SLinus Torvalds return NULL; 28691da177e4SLinus Torvalds 28701da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 28711da177e4SLinus Torvalds addr_buf = addrs; 28721da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2873ea110733SJoe Perches addr = addr_buf; 28741da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28751da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28761da177e4SLinus Torvalds param.param_hdr.type = flags; 28771da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 28781da177e4SLinus Torvalds param.crr_id = i; 28791da177e4SLinus Torvalds 28801da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 28811da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 28821da177e4SLinus Torvalds 28831da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28841da177e4SLinus Torvalds } 28858a07eb0aSMichio Honda if (flags == SCTP_PARAM_ADD_IP && del_pickup) { 28868a07eb0aSMichio Honda addr = asoc->asconf_addr_del_pending; 28878a07eb0aSMichio Honda af = sctp_get_af_specific(addr->v4.sin_family); 28888a07eb0aSMichio Honda addr_param_len = af->to_addr_param(addr, &addr_param); 28898a07eb0aSMichio Honda param.param_hdr.type = SCTP_PARAM_DEL_IP; 28908a07eb0aSMichio Honda param.param_hdr.length = htons(paramlen + addr_param_len); 28918a07eb0aSMichio Honda param.crr_id = i; 28928a07eb0aSMichio Honda 28938a07eb0aSMichio Honda sctp_addto_chunk(retval, paramlen, ¶m); 28948a07eb0aSMichio Honda sctp_addto_chunk(retval, addr_param_len, &addr_param); 28958a07eb0aSMichio Honda } 28961da177e4SLinus Torvalds return retval; 28971da177e4SLinus Torvalds } 28981da177e4SLinus Torvalds 28991da177e4SLinus Torvalds /* ADDIP 29001da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 29011da177e4SLinus Torvalds * 0 1 2 3 29021da177e4SLinus 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 29031da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29041da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 29051da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29061da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 29071da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29081da177e4SLinus Torvalds * | Address Parameter | 29091da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29101da177e4SLinus Torvalds * 29111da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 29121da177e4SLinus Torvalds */ 29131da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 29141da177e4SLinus Torvalds union sctp_addr *addr) 29151da177e4SLinus Torvalds { 29161da177e4SLinus Torvalds sctp_addip_param_t param; 29171da177e4SLinus Torvalds struct sctp_chunk *retval; 29181da177e4SLinus Torvalds int len = sizeof(param); 29191da177e4SLinus Torvalds union sctp_addr_param addrparam; 29201da177e4SLinus Torvalds int addrlen; 29211da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 29221da177e4SLinus Torvalds 29231da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 29241da177e4SLinus Torvalds if (!addrlen) 29251da177e4SLinus Torvalds return NULL; 29261da177e4SLinus Torvalds len += addrlen; 29271da177e4SLinus Torvalds 29281da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 29291da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 29301da177e4SLinus Torvalds if (!retval) 29311da177e4SLinus Torvalds return NULL; 29321da177e4SLinus Torvalds 29331da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 29341da177e4SLinus Torvalds param.param_hdr.length = htons(len); 29351da177e4SLinus Torvalds param.crr_id = 0; 29361da177e4SLinus Torvalds 29371da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 29381da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 29391da177e4SLinus Torvalds 29401da177e4SLinus Torvalds return retval; 29411da177e4SLinus Torvalds } 29421da177e4SLinus Torvalds 29431da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 29441da177e4SLinus Torvalds * 0 1 2 3 29451da177e4SLinus 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 29461da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29471da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 29481da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29491da177e4SLinus Torvalds * | Serial Number | 29501da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29511da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 29521da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29531da177e4SLinus Torvalds * \ \ 29541da177e4SLinus Torvalds * / .... / 29551da177e4SLinus Torvalds * \ \ 29561da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29571da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 29581da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29591da177e4SLinus Torvalds * 29601da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 29611da177e4SLinus Torvalds */ 29621da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 29631da177e4SLinus Torvalds __u32 serial, int vparam_len) 29641da177e4SLinus Torvalds { 29651da177e4SLinus Torvalds sctp_addiphdr_t asconf; 29661da177e4SLinus Torvalds struct sctp_chunk *retval; 29671da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 29681da177e4SLinus Torvalds 29691da177e4SLinus Torvalds /* Create the chunk. */ 2970cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length, 2971cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 29721da177e4SLinus Torvalds if (!retval) 29731da177e4SLinus Torvalds return NULL; 29741da177e4SLinus Torvalds 29751da177e4SLinus Torvalds asconf.serial = htonl(serial); 29761da177e4SLinus Torvalds 29771da177e4SLinus Torvalds retval->subh.addip_hdr = 29781da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 29791da177e4SLinus Torvalds 29801da177e4SLinus Torvalds return retval; 29811da177e4SLinus Torvalds } 29821da177e4SLinus Torvalds 29831da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 29849f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 2985dbc16db1SAl Viro __be16 err_code, sctp_addip_param_t *asconf_param) 29861da177e4SLinus Torvalds { 29871da177e4SLinus Torvalds sctp_addip_param_t ack_param; 29881da177e4SLinus Torvalds sctp_errhdr_t err_param; 29891da177e4SLinus Torvalds int asconf_param_len = 0; 29901da177e4SLinus Torvalds int err_param_len = 0; 2991dbc16db1SAl Viro __be16 response_type; 29921da177e4SLinus Torvalds 29931da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 29941da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 29951da177e4SLinus Torvalds } else { 29961da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 29971da177e4SLinus Torvalds err_param_len = sizeof(err_param); 29981da177e4SLinus Torvalds if (asconf_param) 29991da177e4SLinus Torvalds asconf_param_len = 30001da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 30011da177e4SLinus Torvalds } 30021da177e4SLinus Torvalds 30031da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 30041da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 30051da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 30061da177e4SLinus Torvalds err_param_len + 30071da177e4SLinus Torvalds asconf_param_len); 30081da177e4SLinus Torvalds ack_param.crr_id = crr_id; 30091da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 30101da177e4SLinus Torvalds 30111da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 30121da177e4SLinus Torvalds return; 30131da177e4SLinus Torvalds 30141da177e4SLinus Torvalds /* Add Error Cause parameter. */ 30151da177e4SLinus Torvalds err_param.cause = err_code; 30161da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 30171da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 30181da177e4SLinus Torvalds 30191da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 30201da177e4SLinus Torvalds if (asconf_param) 30211da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 30221da177e4SLinus Torvalds } 30231da177e4SLinus Torvalds 30241da177e4SLinus Torvalds /* Process a asconf parameter. */ 3025dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 30261da177e4SLinus Torvalds struct sctp_chunk *asconf, 30271da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 30281da177e4SLinus Torvalds { 30291da177e4SLinus Torvalds struct sctp_transport *peer; 30301da177e4SLinus Torvalds struct sctp_af *af; 30311da177e4SLinus Torvalds union sctp_addr addr; 30321da177e4SLinus Torvalds union sctp_addr_param *addr_param; 30331da177e4SLinus Torvalds 3034ea110733SJoe Perches addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); 3035c1cc678aSPatrick McHardy 303644e65c1eSWei Yongjun if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && 303744e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && 303844e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) 303944e65c1eSWei Yongjun return SCTP_ERROR_UNKNOWN_PARAM; 304044e65c1eSWei Yongjun 30416a435732SShan Wei switch (addr_param->p.type) { 3042c4492586SWei Yongjun case SCTP_PARAM_IPV6_ADDRESS: 3043c4492586SWei Yongjun if (!asoc->peer.ipv6_address) 3044945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3045c4492586SWei Yongjun break; 3046c4492586SWei Yongjun case SCTP_PARAM_IPV4_ADDRESS: 3047c4492586SWei Yongjun if (!asoc->peer.ipv4_address) 3048945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3049c4492586SWei Yongjun break; 3050c4492586SWei Yongjun default: 3051945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3052c4492586SWei Yongjun } 3053c4492586SWei Yongjun 30546a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 30551da177e4SLinus Torvalds if (unlikely(!af)) 3056945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 30571da177e4SLinus Torvalds 3058dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); 305942e30bf3SVlad Yasevich 306042e30bf3SVlad Yasevich /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast 306142e30bf3SVlad Yasevich * or multicast address. 306242e30bf3SVlad Yasevich * (note: wildcard is permitted and requires special handling so 306342e30bf3SVlad Yasevich * make sure we check for that) 306442e30bf3SVlad Yasevich */ 306542e30bf3SVlad Yasevich if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) 3066945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 306742e30bf3SVlad Yasevich 30681da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 30691da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 307042e30bf3SVlad Yasevich /* Section 4.2.1: 307142e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the source 307242e30bf3SVlad Yasevich * address of the packet MUST be added. 307342e30bf3SVlad Yasevich */ 307442e30bf3SVlad Yasevich if (af->is_any(&addr)) 307542e30bf3SVlad Yasevich memcpy(&addr, &asconf->source, sizeof(addr)); 307642e30bf3SVlad Yasevich 30771da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 30781da177e4SLinus Torvalds * request and does not have the local resources to add this 30791da177e4SLinus Torvalds * new address to the association, it MUST return an Error 30801da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 30811da177e4SLinus Torvalds * Due to Resource Shortage'. 30821da177e4SLinus Torvalds */ 30831da177e4SLinus Torvalds 3084dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 30851da177e4SLinus Torvalds if (!peer) 30861da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 30871da177e4SLinus Torvalds 30881da177e4SLinus Torvalds /* Start the heartbeat timer. */ 3089ba6f5e33SMarcelo Ricardo Leitner sctp_transport_reset_hb_timer(peer); 30906af29cccSMichio Honda asoc->new_transport = peer; 30911da177e4SLinus Torvalds break; 30921da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 30931da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 30941da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 30951da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 30961da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 30971da177e4SLinus Torvalds */ 309842e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 30991da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 31001da177e4SLinus Torvalds 31011da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 31021da177e4SLinus Torvalds * address which is also the source address of the IP packet 31031da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 31041da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 31051da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 31061da177e4SLinus Torvalds * Delete Source IP Address' 31071da177e4SLinus Torvalds */ 3108b1364104SMichio Honda if (sctp_cmp_addr_exact(&asconf->source, &addr)) 31091da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 31101da177e4SLinus Torvalds 311142e30bf3SVlad Yasevich /* Section 4.2.2 311242e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 311342e30bf3SVlad Yasevich * addresses of the peer except the source address of the 311442e30bf3SVlad Yasevich * packet MUST be deleted. 311542e30bf3SVlad Yasevich */ 311642e30bf3SVlad Yasevich if (af->is_any(&addr)) { 311742e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 311842e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 311942e30bf3SVlad Yasevich asconf->transport); 31207c5a9461Slucien return SCTP_ERROR_NO_ERROR; 31217c5a9461Slucien } 31227c5a9461Slucien 31237c5a9461Slucien /* If the address is not part of the association, the 31247c5a9461Slucien * ASCONF-ACK with Error Cause Indication Parameter 31257c5a9461Slucien * which including cause of Unresolvable Address should 31267c5a9461Slucien * be sent. 31277c5a9461Slucien */ 31287c5a9461Slucien peer = sctp_assoc_lookup_paddr(asoc, &addr); 31297c5a9461Slucien if (!peer) 31307c5a9461Slucien return SCTP_ERROR_DNS_FAILED; 31317c5a9461Slucien 31327c5a9461Slucien sctp_assoc_rm_peer(asoc, peer); 31331da177e4SLinus Torvalds break; 31341da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 313542e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 313642e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 313742e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 313842e30bf3SVlad Yasevich * primary. 313942e30bf3SVlad Yasevich */ 314042e30bf3SVlad Yasevich if (af->is_any(&addr)) 314142e30bf3SVlad Yasevich memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); 314242e30bf3SVlad Yasevich 3143dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 31441da177e4SLinus Torvalds if (!peer) 3145945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 31461da177e4SLinus Torvalds 31471da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 31481da177e4SLinus Torvalds break; 31491da177e4SLinus Torvalds } 31501da177e4SLinus Torvalds 31511da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 31521da177e4SLinus Torvalds } 31531da177e4SLinus Torvalds 31546f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 31559de7922bSDaniel Borkmann bool sctp_verify_asconf(const struct sctp_association *asoc, 31569de7922bSDaniel Borkmann struct sctp_chunk *chunk, bool addr_param_needed, 31579de7922bSDaniel Borkmann struct sctp_paramhdr **errp) 31589de7922bSDaniel Borkmann { 31599de7922bSDaniel Borkmann sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) chunk->chunk_hdr; 31606f4c618dSWei Yongjun union sctp_params param; 31619de7922bSDaniel Borkmann bool addr_param_seen = false; 31626f4c618dSWei Yongjun 31639de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 31649de7922bSDaniel Borkmann size_t length = ntohs(param.p->length); 31659de7922bSDaniel Borkmann 31666f4c618dSWei Yongjun *errp = param.p; 31676f4c618dSWei Yongjun switch (param.p->type) { 31689de7922bSDaniel Borkmann case SCTP_PARAM_ERR_CAUSE: 31699de7922bSDaniel Borkmann break; 31709de7922bSDaniel Borkmann case SCTP_PARAM_IPV4_ADDRESS: 31719de7922bSDaniel Borkmann if (length != sizeof(sctp_ipv4addr_param_t)) 31729de7922bSDaniel Borkmann return false; 3173ce7b4cccSlucien /* ensure there is only one addr param and it's in the 3174ce7b4cccSlucien * beginning of addip_hdr params, or we reject it. 3175ce7b4cccSlucien */ 3176ce7b4cccSlucien if (param.v != addip->addip_hdr.params) 3177ce7b4cccSlucien return false; 31789de7922bSDaniel Borkmann addr_param_seen = true; 31799de7922bSDaniel Borkmann break; 31809de7922bSDaniel Borkmann case SCTP_PARAM_IPV6_ADDRESS: 31819de7922bSDaniel Borkmann if (length != sizeof(sctp_ipv6addr_param_t)) 31829de7922bSDaniel Borkmann return false; 3183ce7b4cccSlucien if (param.v != addip->addip_hdr.params) 3184ce7b4cccSlucien return false; 31859de7922bSDaniel Borkmann addr_param_seen = true; 31869de7922bSDaniel Borkmann break; 31876f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 31886f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 31896f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 31909de7922bSDaniel Borkmann /* In ASCONF chunks, these need to be first. */ 31919de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 31929de7922bSDaniel Borkmann return false; 31939de7922bSDaniel Borkmann length = ntohs(param.addip->param_hdr.length); 31949de7922bSDaniel Borkmann if (length < sizeof(sctp_addip_param_t) + 31956f4c618dSWei Yongjun sizeof(sctp_paramhdr_t)) 31969de7922bSDaniel Borkmann return false; 31976f4c618dSWei Yongjun break; 31986f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 31996f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 32006f4c618dSWei Yongjun if (length != sizeof(sctp_addip_param_t)) 32019de7922bSDaniel Borkmann return false; 32026f4c618dSWei Yongjun break; 32036f4c618dSWei Yongjun default: 32049de7922bSDaniel Borkmann /* This is unkown to us, reject! */ 32059de7922bSDaniel Borkmann return false; 32069de7922bSDaniel Borkmann } 32076f4c618dSWei Yongjun } 32086f4c618dSWei Yongjun 32099de7922bSDaniel Borkmann /* Remaining sanity checks. */ 32109de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 32119de7922bSDaniel Borkmann return false; 32129de7922bSDaniel Borkmann if (!addr_param_needed && addr_param_seen) 32139de7922bSDaniel Borkmann return false; 32149de7922bSDaniel Borkmann if (param.v != chunk->chunk_end) 32159de7922bSDaniel Borkmann return false; 32166f4c618dSWei Yongjun 32179de7922bSDaniel Borkmann return true; 32186f4c618dSWei Yongjun } 32196f4c618dSWei Yongjun 32201da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 32211da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 32221da177e4SLinus Torvalds */ 32231da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 32241da177e4SLinus Torvalds struct sctp_chunk *asconf) 32251da177e4SLinus Torvalds { 32269de7922bSDaniel Borkmann sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) asconf->chunk_hdr; 32279de7922bSDaniel Borkmann bool all_param_pass = true; 32289de7922bSDaniel Borkmann union sctp_params param; 32291da177e4SLinus Torvalds sctp_addiphdr_t *hdr; 32301da177e4SLinus Torvalds union sctp_addr_param *addr_param; 32311da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 3232dbc16db1SAl Viro __be16 err_code; 32331da177e4SLinus Torvalds int length = 0; 3234f3830cccSWei Yongjun int chunk_len; 32351da177e4SLinus Torvalds __u32 serial; 32361da177e4SLinus Torvalds 3237f3830cccSWei Yongjun chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t); 32381da177e4SLinus Torvalds hdr = (sctp_addiphdr_t *)asconf->skb->data; 32391da177e4SLinus Torvalds serial = ntohl(hdr->serial); 32401da177e4SLinus Torvalds 32411da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 32421da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 32431da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 32441da177e4SLinus Torvalds chunk_len -= length; 32451da177e4SLinus Torvalds 32461da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 32477aa1b54bSJoe Perches * asconf parameter. 32481da177e4SLinus Torvalds */ 32496a435732SShan Wei length = ntohs(addr_param->p.length); 32501da177e4SLinus Torvalds chunk_len -= length; 32511da177e4SLinus Torvalds 32521da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 32531da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 32542cab86beSWei Yongjun * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF 32557aa1b54bSJoe Perches * parameters. 32561da177e4SLinus Torvalds */ 32572cab86beSWei Yongjun asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); 32581da177e4SLinus Torvalds if (!asconf_ack) 32591da177e4SLinus Torvalds goto done; 32601da177e4SLinus Torvalds 32611da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 32629de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 32639de7922bSDaniel Borkmann /* Skip preceeding address parameters. */ 32649de7922bSDaniel Borkmann if (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 32659de7922bSDaniel Borkmann param.p->type == SCTP_PARAM_IPV6_ADDRESS) 32669de7922bSDaniel Borkmann continue; 32679de7922bSDaniel Borkmann 32681da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 32699de7922bSDaniel Borkmann param.addip); 32701da177e4SLinus Torvalds /* ADDIP 4.1 A7) 32711da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 32721da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 32731da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 32741da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 32751da177e4SLinus Torvalds * a specific success indication is present for the parameter. 32761da177e4SLinus Torvalds */ 32779de7922bSDaniel Borkmann if (err_code != SCTP_ERROR_NO_ERROR) 32789de7922bSDaniel Borkmann all_param_pass = false; 32791da177e4SLinus Torvalds if (!all_param_pass) 32809de7922bSDaniel Borkmann sctp_add_asconf_response(asconf_ack, param.addip->crr_id, 32819de7922bSDaniel Borkmann err_code, param.addip); 32821da177e4SLinus Torvalds 32831da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 32841da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 32851da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 32861da177e4SLinus Torvalds * in the ASCONF. 32871da177e4SLinus Torvalds */ 32889de7922bSDaniel Borkmann if (err_code == SCTP_ERROR_RSRC_LOW) 32891da177e4SLinus Torvalds goto done; 32901da177e4SLinus Torvalds } 32911da177e4SLinus Torvalds done: 32921da177e4SLinus Torvalds asoc->peer.addip_serial++; 32931da177e4SLinus Torvalds 32941da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 32951da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 32961da177e4SLinus Torvalds */ 32971da177e4SLinus Torvalds if (asconf_ack) { 32981da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3299a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3300a08de64dSVlad Yasevich &asoc->asconf_ack_list); 33011da177e4SLinus Torvalds } 33021da177e4SLinus Torvalds 33031da177e4SLinus Torvalds return asconf_ack; 33041da177e4SLinus Torvalds } 33051da177e4SLinus Torvalds 33061da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 3307425e0f68SWei Yongjun static void sctp_asconf_param_success(struct sctp_association *asoc, 33081da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 33091da177e4SLinus Torvalds { 33101da177e4SLinus Torvalds struct sctp_af *af; 33111da177e4SLinus Torvalds union sctp_addr addr; 33121da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 33131da177e4SLinus Torvalds union sctp_addr_param *addr_param; 33141da177e4SLinus Torvalds struct sctp_transport *transport; 3315dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 33161da177e4SLinus Torvalds 3317ea110733SJoe Perches addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); 33181da177e4SLinus Torvalds 33191da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 33206a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 3321dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 33221da177e4SLinus Torvalds 33231da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 33241da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3325559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3326559cf710SVlad Yasevich * held, so the list can not change. 3327559cf710SVlad Yasevich */ 33280ed90fb0SVlad Yasevich local_bh_disable(); 3329559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3330dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3331f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3332dc022a98SSridhar Samudrala } 33330ed90fb0SVlad Yasevich local_bh_enable(); 33343cd9749cSWei Yongjun list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33353cd9749cSWei Yongjun transports) { 3336c86a773cSJulian Anastasov sctp_transport_dst_release(transport); 33373cd9749cSWei Yongjun } 33381da177e4SLinus Torvalds break; 33391da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 33400ed90fb0SVlad Yasevich local_bh_disable(); 3341425e0f68SWei Yongjun sctp_del_bind_addr(bp, &addr); 33428a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending != NULL && 33438a07eb0aSMichio Honda sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { 33448a07eb0aSMichio Honda kfree(asoc->asconf_addr_del_pending); 33458a07eb0aSMichio Honda asoc->asconf_addr_del_pending = NULL; 33468a07eb0aSMichio Honda } 33470ed90fb0SVlad Yasevich local_bh_enable(); 33489dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33499dbc15f0SRobert P. J. Day transports) { 3350c86a773cSJulian Anastasov sctp_transport_dst_release(transport); 33511da177e4SLinus Torvalds } 33521da177e4SLinus Torvalds break; 33531da177e4SLinus Torvalds default: 33541da177e4SLinus Torvalds break; 33551da177e4SLinus Torvalds } 33561da177e4SLinus Torvalds } 33571da177e4SLinus Torvalds 33581da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 33591da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 33601da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 33611da177e4SLinus Torvalds * ADDIP 4.1 33621da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 33631da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 33641da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 33651da177e4SLinus Torvalds * specific success indication is present for the parameter. 33661da177e4SLinus Torvalds */ 3367dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 33681da177e4SLinus Torvalds sctp_addip_param_t *asconf_param, 33691da177e4SLinus Torvalds int no_err) 33701da177e4SLinus Torvalds { 33711da177e4SLinus Torvalds sctp_addip_param_t *asconf_ack_param; 33721da177e4SLinus Torvalds sctp_errhdr_t *err_param; 33731da177e4SLinus Torvalds int length; 3374f3830cccSWei Yongjun int asconf_ack_len; 3375dbc16db1SAl Viro __be16 err_code; 33761da177e4SLinus Torvalds 33771da177e4SLinus Torvalds if (no_err) 33781da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 33791da177e4SLinus Torvalds else 33801da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 33811da177e4SLinus Torvalds 3382f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3383f3830cccSWei Yongjun sizeof(sctp_chunkhdr_t); 3384f3830cccSWei Yongjun 33851da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 33861da177e4SLinus Torvalds * the first asconf_ack parameter. 33871da177e4SLinus Torvalds */ 33881da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 33891da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + 33901da177e4SLinus Torvalds length); 33911da177e4SLinus Torvalds asconf_ack_len -= length; 33921da177e4SLinus Torvalds 33931da177e4SLinus Torvalds while (asconf_ack_len > 0) { 33941da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 33951da177e4SLinus Torvalds switch (asconf_ack_param->param_hdr.type) { 33961da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 33971da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 33981da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 33991da177e4SLinus Torvalds length = sizeof(sctp_addip_param_t); 3400ea110733SJoe Perches err_param = (void *)asconf_ack_param + length; 34011da177e4SLinus Torvalds asconf_ack_len -= length; 34021da177e4SLinus Torvalds if (asconf_ack_len > 0) 34031da177e4SLinus Torvalds return err_param->cause; 34041da177e4SLinus Torvalds else 34051da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 34061da177e4SLinus Torvalds break; 34071da177e4SLinus Torvalds default: 34081da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 34091da177e4SLinus Torvalds } 34101da177e4SLinus Torvalds } 34111da177e4SLinus Torvalds 34121da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 3413ea110733SJoe Perches asconf_ack_param = (void *)asconf_ack_param + length; 34141da177e4SLinus Torvalds asconf_ack_len -= length; 34151da177e4SLinus Torvalds } 34161da177e4SLinus Torvalds 34171da177e4SLinus Torvalds return err_code; 34181da177e4SLinus Torvalds } 34191da177e4SLinus Torvalds 34201da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 34211da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 34221da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 34231da177e4SLinus Torvalds { 34241da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 34251da177e4SLinus Torvalds union sctp_addr_param *addr_param; 34261da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 34271da177e4SLinus Torvalds int length = 0; 34281da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 34291da177e4SLinus Torvalds int all_param_pass = 0; 34301da177e4SLinus Torvalds int no_err = 1; 34311da177e4SLinus Torvalds int retval = 0; 3432dbc16db1SAl Viro __be16 err_code = SCTP_ERROR_NO_ERROR; 34331da177e4SLinus Torvalds 34341da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 34351da177e4SLinus Torvalds * a pointer to address parameter. 34361da177e4SLinus Torvalds */ 34371da177e4SLinus Torvalds length = sizeof(sctp_addip_chunk_t); 34381da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 34391da177e4SLinus Torvalds asconf_len -= length; 34401da177e4SLinus Torvalds 34411da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 34427aa1b54bSJoe Perches * pointer to the first asconf parameter. 34431da177e4SLinus Torvalds */ 34446a435732SShan Wei length = ntohs(addr_param->p.length); 3445ea110733SJoe Perches asconf_param = (void *)addr_param + length; 34461da177e4SLinus Torvalds asconf_len -= length; 34471da177e4SLinus Torvalds 34481da177e4SLinus Torvalds /* ADDIP 4.1 34491da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 34501da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 34511da177e4SLinus Torvalds * successful. 34521da177e4SLinus Torvalds */ 34531da177e4SLinus Torvalds if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) 34541da177e4SLinus Torvalds all_param_pass = 1; 34551da177e4SLinus Torvalds 34561da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 34571da177e4SLinus Torvalds while (asconf_len > 0) { 34581da177e4SLinus Torvalds if (all_param_pass) 34591da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 34601da177e4SLinus Torvalds else { 34611da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 34621da177e4SLinus Torvalds asconf_param, 34631da177e4SLinus Torvalds no_err); 34641da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 34651da177e4SLinus Torvalds no_err = 0; 34661da177e4SLinus Torvalds } 34671da177e4SLinus Torvalds 34681da177e4SLinus Torvalds switch (err_code) { 34691da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 3470425e0f68SWei Yongjun sctp_asconf_param_success(asoc, asconf_param); 34711da177e4SLinus Torvalds break; 34721da177e4SLinus Torvalds 34731da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 34741da177e4SLinus Torvalds retval = 1; 34751da177e4SLinus Torvalds break; 34761da177e4SLinus Torvalds 3477a987f762SWei Yongjun case SCTP_ERROR_UNKNOWN_PARAM: 34781da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 34791da177e4SLinus Torvalds * future. 34801da177e4SLinus Torvalds */ 34811da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 34821da177e4SLinus Torvalds asconf_param->param_hdr.type; 34831da177e4SLinus Torvalds break; 34841da177e4SLinus Torvalds 34851da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 34861da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 34871da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 34881da177e4SLinus Torvalds default: 34891da177e4SLinus Torvalds break; 34901da177e4SLinus Torvalds } 34911da177e4SLinus Torvalds 34921da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 34931da177e4SLinus Torvalds * one. 34941da177e4SLinus Torvalds */ 34951da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3496ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 34971da177e4SLinus Torvalds asconf_len -= length; 34981da177e4SLinus Torvalds } 34991da177e4SLinus Torvalds 3500ddc4bbeeSMichio Honda if (no_err && asoc->src_out_of_asoc_ok) { 35018a07eb0aSMichio Honda asoc->src_out_of_asoc_ok = 0; 3502ddc4bbeeSMichio Honda sctp_transport_immediate_rtx(asoc->peer.primary_path); 3503ddc4bbeeSMichio Honda } 35048a07eb0aSMichio Honda 35051da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 35065f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 35071da177e4SLinus Torvalds sctp_chunk_free(asconf); 35081da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 35091da177e4SLinus Torvalds 35101da177e4SLinus Torvalds return retval; 35111da177e4SLinus Torvalds } 35121da177e4SLinus Torvalds 35131da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 35141da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 35151da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 35161da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 35171da177e4SLinus Torvalds { 35181da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 35191da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 35201da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 35211da177e4SLinus Torvalds size_t hint; 35221da177e4SLinus Torvalds int i; 35231da177e4SLinus Torvalds 35241da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 35251da177e4SLinus Torvalds 3526cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC); 35271da177e4SLinus Torvalds 35281da177e4SLinus Torvalds if (!retval) 35291da177e4SLinus Torvalds return NULL; 35301da177e4SLinus Torvalds 35311da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 35321da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 35331da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 35341da177e4SLinus Torvalds 35351da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 35361da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 35371da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 35381da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 35391da177e4SLinus Torvalds } 35401da177e4SLinus Torvalds 35411da177e4SLinus Torvalds return retval; 35421da177e4SLinus Torvalds } 3543cc16f00fSXin Long 3544cc16f00fSXin Long /* RE-CONFIG 3.1 (RE-CONFIG chunk) 3545cc16f00fSXin Long * 0 1 2 3 3546cc16f00fSXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3547cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3548cc16f00fSXin Long * | Type = 130 | Chunk Flags | Chunk Length | 3549cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3550cc16f00fSXin Long * \ \ 3551cc16f00fSXin Long * / Re-configuration Parameter / 3552cc16f00fSXin Long * \ \ 3553cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3554cc16f00fSXin Long * \ \ 3555cc16f00fSXin Long * / Re-configuration Parameter (optional) / 3556cc16f00fSXin Long * \ \ 3557cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3558cc16f00fSXin Long */ 3559cc16f00fSXin Long static struct sctp_chunk *sctp_make_reconf( 3560cc16f00fSXin Long const struct sctp_association *asoc, 3561cc16f00fSXin Long int length) 3562cc16f00fSXin Long { 3563cc16f00fSXin Long struct sctp_reconf_chunk *reconf; 3564cc16f00fSXin Long struct sctp_chunk *retval; 3565cc16f00fSXin Long 3566cc16f00fSXin Long retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length, 3567cc16f00fSXin Long GFP_ATOMIC); 3568cc16f00fSXin Long if (!retval) 3569cc16f00fSXin Long return NULL; 3570cc16f00fSXin Long 3571cc16f00fSXin Long reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr; 3572cc16f00fSXin Long retval->param_hdr.v = reconf->params; 3573cc16f00fSXin Long 3574cc16f00fSXin Long return retval; 3575cc16f00fSXin Long } 3576cc16f00fSXin Long 3577cc16f00fSXin Long /* RE-CONFIG 4.1 (STREAM OUT RESET) 3578cc16f00fSXin Long * 0 1 2 3 3579cc16f00fSXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3580cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3581cc16f00fSXin Long * | Parameter Type = 13 | Parameter Length = 16 + 2 * N | 3582cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3583cc16f00fSXin Long * | Re-configuration Request Sequence Number | 3584cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3585cc16f00fSXin Long * | Re-configuration Response Sequence Number | 3586cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3587cc16f00fSXin Long * | Sender's Last Assigned TSN | 3588cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3589cc16f00fSXin Long * | Stream Number 1 (optional) | Stream Number 2 (optional) | 3590cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3591cc16f00fSXin Long * / ...... / 3592cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3593cc16f00fSXin Long * | Stream Number N-1 (optional) | Stream Number N (optional) | 3594cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3595cc16f00fSXin Long * 3596cc16f00fSXin Long * RE-CONFIG 4.2 (STREAM IN RESET) 3597cc16f00fSXin Long * 0 1 2 3 3598cc16f00fSXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3599cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3600cc16f00fSXin Long * | Parameter Type = 14 | Parameter Length = 8 + 2 * N | 3601cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3602cc16f00fSXin Long * | Re-configuration Request Sequence Number | 3603cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3604cc16f00fSXin Long * | Stream Number 1 (optional) | Stream Number 2 (optional) | 3605cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3606cc16f00fSXin Long * / ...... / 3607cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3608cc16f00fSXin Long * | Stream Number N-1 (optional) | Stream Number N (optional) | 3609cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3610cc16f00fSXin Long */ 3611cc16f00fSXin Long struct sctp_chunk *sctp_make_strreset_req( 3612cc16f00fSXin Long const struct sctp_association *asoc, 3613cc16f00fSXin Long __u16 stream_num, __u16 *stream_list, 3614cc16f00fSXin Long bool out, bool in) 3615cc16f00fSXin Long { 3616cc16f00fSXin Long struct sctp_strreset_outreq outreq; 3617cc16f00fSXin Long __u16 stream_len = stream_num * 2; 3618cc16f00fSXin Long struct sctp_strreset_inreq inreq; 3619cc16f00fSXin Long struct sctp_chunk *retval; 362016e1a919SXin Long __u16 outlen, inlen; 3621cc16f00fSXin Long 3622cc16f00fSXin Long outlen = (sizeof(outreq) + stream_len) * out; 3623cc16f00fSXin Long inlen = (sizeof(inreq) + stream_len) * in; 3624cc16f00fSXin Long 3625cc16f00fSXin Long retval = sctp_make_reconf(asoc, outlen + inlen); 3626cc16f00fSXin Long if (!retval) 3627cc16f00fSXin Long return NULL; 3628cc16f00fSXin Long 3629cc16f00fSXin Long if (outlen) { 3630cc16f00fSXin Long outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST; 3631cc16f00fSXin Long outreq.param_hdr.length = htons(outlen); 3632cc16f00fSXin Long outreq.request_seq = htonl(asoc->strreset_outseq); 3633cc16f00fSXin Long outreq.response_seq = htonl(asoc->strreset_inseq - 1); 3634cc16f00fSXin Long outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1); 3635cc16f00fSXin Long 3636cc16f00fSXin Long sctp_addto_chunk(retval, sizeof(outreq), &outreq); 3637cc16f00fSXin Long 3638cc16f00fSXin Long if (stream_len) 3639cc16f00fSXin Long sctp_addto_chunk(retval, stream_len, stream_list); 3640cc16f00fSXin Long } 3641cc16f00fSXin Long 3642cc16f00fSXin Long if (inlen) { 3643cc16f00fSXin Long inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST; 3644cc16f00fSXin Long inreq.param_hdr.length = htons(inlen); 3645cc16f00fSXin Long inreq.request_seq = htonl(asoc->strreset_outseq + out); 3646cc16f00fSXin Long 3647cc16f00fSXin Long sctp_addto_chunk(retval, sizeof(inreq), &inreq); 3648cc16f00fSXin Long 3649cc16f00fSXin Long if (stream_len) 3650cc16f00fSXin Long sctp_addto_chunk(retval, stream_len, stream_list); 3651cc16f00fSXin Long } 3652cc16f00fSXin Long 3653cc16f00fSXin Long return retval; 3654cc16f00fSXin Long } 3655c56480a1SXin Long 3656c56480a1SXin Long /* RE-CONFIG 4.3 (SSN/TSN RESET ALL) 3657c56480a1SXin Long * 0 1 2 3 3658c56480a1SXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3659c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3660c56480a1SXin Long * | Parameter Type = 15 | Parameter Length = 8 | 3661c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3662c56480a1SXin Long * | Re-configuration Request Sequence Number | 3663c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3664c56480a1SXin Long */ 3665c56480a1SXin Long struct sctp_chunk *sctp_make_strreset_tsnreq( 3666c56480a1SXin Long const struct sctp_association *asoc) 3667c56480a1SXin Long { 3668c56480a1SXin Long struct sctp_strreset_tsnreq tsnreq; 3669c56480a1SXin Long __u16 length = sizeof(tsnreq); 3670c56480a1SXin Long struct sctp_chunk *retval; 3671c56480a1SXin Long 3672c56480a1SXin Long retval = sctp_make_reconf(asoc, length); 3673c56480a1SXin Long if (!retval) 3674c56480a1SXin Long return NULL; 3675c56480a1SXin Long 3676c56480a1SXin Long tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST; 3677c56480a1SXin Long tsnreq.param_hdr.length = htons(length); 3678c56480a1SXin Long tsnreq.request_seq = htonl(asoc->strreset_outseq); 3679c56480a1SXin Long 3680c56480a1SXin Long sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq); 3681c56480a1SXin Long 3682c56480a1SXin Long return retval; 3683c56480a1SXin Long } 368478098117SXin Long 368578098117SXin Long /* RE-CONFIG 4.5/4.6 (ADD STREAM) 368678098117SXin Long * 0 1 2 3 368778098117SXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 368878098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 368978098117SXin Long * | Parameter Type = 17 | Parameter Length = 12 | 369078098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 369178098117SXin Long * | Re-configuration Request Sequence Number | 369278098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 369378098117SXin Long * | Number of new streams | Reserved | 369478098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 369578098117SXin Long */ 369678098117SXin Long struct sctp_chunk *sctp_make_strreset_addstrm( 369778098117SXin Long const struct sctp_association *asoc, 369878098117SXin Long __u16 out, __u16 in) 369978098117SXin Long { 370078098117SXin Long struct sctp_strreset_addstrm addstrm; 370178098117SXin Long __u16 size = sizeof(addstrm); 370278098117SXin Long struct sctp_chunk *retval; 370378098117SXin Long 370478098117SXin Long retval = sctp_make_reconf(asoc, (!!out + !!in) * size); 370578098117SXin Long if (!retval) 370678098117SXin Long return NULL; 370778098117SXin Long 370878098117SXin Long if (out) { 370978098117SXin Long addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS; 371078098117SXin Long addstrm.param_hdr.length = htons(size); 371178098117SXin Long addstrm.number_of_streams = htons(out); 371278098117SXin Long addstrm.request_seq = htonl(asoc->strreset_outseq); 371378098117SXin Long addstrm.reserved = 0; 371478098117SXin Long 371578098117SXin Long sctp_addto_chunk(retval, size, &addstrm); 371678098117SXin Long } 371778098117SXin Long 371878098117SXin Long if (in) { 371978098117SXin Long addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS; 372078098117SXin Long addstrm.param_hdr.length = htons(size); 372178098117SXin Long addstrm.number_of_streams = htons(in); 372278098117SXin Long addstrm.request_seq = htonl(asoc->strreset_outseq + !!out); 372378098117SXin Long addstrm.reserved = 0; 372478098117SXin Long 372578098117SXin Long sctp_addto_chunk(retval, size, &addstrm); 372678098117SXin Long } 372778098117SXin Long 372878098117SXin Long return retval; 372978098117SXin Long } 3730bd4b9f8bSXin Long 3731bd4b9f8bSXin Long /* RE-CONFIG 4.4 (RESP) 3732bd4b9f8bSXin Long * 0 1 2 3 3733bd4b9f8bSXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3734bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3735bd4b9f8bSXin Long * | Parameter Type = 16 | Parameter Length | 3736bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3737bd4b9f8bSXin Long * | Re-configuration Response Sequence Number | 3738bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3739bd4b9f8bSXin Long * | Result | 3740bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3741bd4b9f8bSXin Long */ 3742bd4b9f8bSXin Long struct sctp_chunk *sctp_make_strreset_resp( 3743bd4b9f8bSXin Long const struct sctp_association *asoc, 3744bd4b9f8bSXin Long __u32 result, __u32 sn) 3745bd4b9f8bSXin Long { 3746bd4b9f8bSXin Long struct sctp_strreset_resp resp; 3747bd4b9f8bSXin Long __u16 length = sizeof(resp); 3748bd4b9f8bSXin Long struct sctp_chunk *retval; 3749bd4b9f8bSXin Long 3750bd4b9f8bSXin Long retval = sctp_make_reconf(asoc, length); 3751bd4b9f8bSXin Long if (!retval) 3752bd4b9f8bSXin Long return NULL; 3753bd4b9f8bSXin Long 3754bd4b9f8bSXin Long resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; 3755bd4b9f8bSXin Long resp.param_hdr.length = htons(length); 3756bd4b9f8bSXin Long resp.response_seq = htonl(sn); 3757bd4b9f8bSXin Long resp.result = htonl(result); 3758bd4b9f8bSXin Long 3759bd4b9f8bSXin Long sctp_addto_chunk(retval, sizeof(resp), &resp); 3760bd4b9f8bSXin Long 3761bd4b9f8bSXin Long return retval; 3762bd4b9f8bSXin Long } 3763bd4b9f8bSXin Long 3764bd4b9f8bSXin Long /* RE-CONFIG 4.4 OPTIONAL (TSNRESP) 3765bd4b9f8bSXin Long * 0 1 2 3 3766bd4b9f8bSXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3767bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3768bd4b9f8bSXin Long * | Parameter Type = 16 | Parameter Length | 3769bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3770bd4b9f8bSXin Long * | Re-configuration Response Sequence Number | 3771bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3772bd4b9f8bSXin Long * | Result | 3773bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3774bd4b9f8bSXin Long * | Sender's Next TSN (optional) | 3775bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3776bd4b9f8bSXin Long * | Receiver's Next TSN (optional) | 3777bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3778bd4b9f8bSXin Long */ 3779bd4b9f8bSXin Long struct sctp_chunk *sctp_make_strreset_tsnresp( 3780bd4b9f8bSXin Long struct sctp_association *asoc, 3781bd4b9f8bSXin Long __u32 result, __u32 sn, 3782bd4b9f8bSXin Long __u32 sender_tsn, __u32 receiver_tsn) 3783bd4b9f8bSXin Long { 3784bd4b9f8bSXin Long struct sctp_strreset_resptsn tsnresp; 3785bd4b9f8bSXin Long __u16 length = sizeof(tsnresp); 3786bd4b9f8bSXin Long struct sctp_chunk *retval; 3787bd4b9f8bSXin Long 3788bd4b9f8bSXin Long retval = sctp_make_reconf(asoc, length); 3789bd4b9f8bSXin Long if (!retval) 3790bd4b9f8bSXin Long return NULL; 3791bd4b9f8bSXin Long 3792bd4b9f8bSXin Long tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; 3793bd4b9f8bSXin Long tsnresp.param_hdr.length = htons(length); 3794bd4b9f8bSXin Long 3795bd4b9f8bSXin Long tsnresp.response_seq = htonl(sn); 3796bd4b9f8bSXin Long tsnresp.result = htonl(result); 3797bd4b9f8bSXin Long tsnresp.senders_next_tsn = htonl(sender_tsn); 3798bd4b9f8bSXin Long tsnresp.receivers_next_tsn = htonl(receiver_tsn); 3799bd4b9f8bSXin Long 3800bd4b9f8bSXin Long sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp); 3801bd4b9f8bSXin Long 3802bd4b9f8bSXin Long return retval; 3803bd4b9f8bSXin Long } 3804ea625043SXin Long 3805ea625043SXin Long bool sctp_verify_reconf(const struct sctp_association *asoc, 3806ea625043SXin Long struct sctp_chunk *chunk, 3807ea625043SXin Long struct sctp_paramhdr **errp) 3808ea625043SXin Long { 3809ea625043SXin Long struct sctp_reconf_chunk *hdr; 3810ea625043SXin Long union sctp_params param; 3811ea625043SXin Long __u16 last = 0, cnt = 0; 3812ea625043SXin Long 3813ea625043SXin Long hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; 3814ea625043SXin Long sctp_walk_params(param, hdr, params) { 3815ea625043SXin Long __u16 length = ntohs(param.p->length); 3816ea625043SXin Long 3817ea625043SXin Long *errp = param.p; 3818ea625043SXin Long if (cnt++ > 2) 3819ea625043SXin Long return false; 3820ea625043SXin Long switch (param.p->type) { 3821ea625043SXin Long case SCTP_PARAM_RESET_OUT_REQUEST: 3822ea625043SXin Long if (length < sizeof(struct sctp_strreset_outreq) || 3823ea625043SXin Long (last && last != SCTP_PARAM_RESET_RESPONSE && 3824ea625043SXin Long last != SCTP_PARAM_RESET_IN_REQUEST)) 3825ea625043SXin Long return false; 3826ea625043SXin Long break; 3827ea625043SXin Long case SCTP_PARAM_RESET_IN_REQUEST: 3828ea625043SXin Long if (length < sizeof(struct sctp_strreset_inreq) || 3829ea625043SXin Long (last && last != SCTP_PARAM_RESET_OUT_REQUEST)) 3830ea625043SXin Long return false; 3831ea625043SXin Long break; 3832ea625043SXin Long case SCTP_PARAM_RESET_RESPONSE: 3833ea625043SXin Long if ((length != sizeof(struct sctp_strreset_resp) && 3834ea625043SXin Long length != sizeof(struct sctp_strreset_resptsn)) || 3835ea625043SXin Long (last && last != SCTP_PARAM_RESET_RESPONSE && 3836ea625043SXin Long last != SCTP_PARAM_RESET_OUT_REQUEST)) 3837ea625043SXin Long return false; 3838ea625043SXin Long break; 3839ea625043SXin Long case SCTP_PARAM_RESET_TSN_REQUEST: 3840ea625043SXin Long if (length != 3841ea625043SXin Long sizeof(struct sctp_strreset_tsnreq) || last) 3842ea625043SXin Long return false; 3843ea625043SXin Long break; 3844ea625043SXin Long case SCTP_PARAM_RESET_ADD_IN_STREAMS: 3845ea625043SXin Long if (length != sizeof(struct sctp_strreset_addstrm) || 3846ea625043SXin Long (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS)) 3847ea625043SXin Long return false; 3848ea625043SXin Long break; 3849ea625043SXin Long case SCTP_PARAM_RESET_ADD_OUT_STREAMS: 3850ea625043SXin Long if (length != sizeof(struct sctp_strreset_addstrm) || 3851ea625043SXin Long (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS)) 3852ea625043SXin Long return false; 3853ea625043SXin Long break; 3854ea625043SXin Long default: 3855ea625043SXin Long return false; 3856ea625043SXin Long } 3857ea625043SXin Long 3858ea625043SXin Long last = param.p->type; 3859ea625043SXin Long } 3860ea625043SXin Long 3861ea625043SXin Long return true; 3862ea625043SXin Long } 3863