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 261da177e4SLinus Torvalds * along with GNU CC; see the file COPYING. If not, write to 271da177e4SLinus Torvalds * the Free Software Foundation, 59 Temple Place - Suite 330, 281da177e4SLinus Torvalds * Boston, MA 02111-1307, USA. 291da177e4SLinus Torvalds * 301da177e4SLinus Torvalds * Please send any bug reports or fixes you make to the 311da177e4SLinus Torvalds * email address(es): 321da177e4SLinus Torvalds * lksctp developers <lksctp-developers@lists.sourceforge.net> 331da177e4SLinus Torvalds * 341da177e4SLinus Torvalds * Or submit a bug report through the following website: 351da177e4SLinus Torvalds * http://www.sf.net/projects/lksctp 361da177e4SLinus Torvalds * 371da177e4SLinus Torvalds * Written or modified by: 381da177e4SLinus Torvalds * La Monte H.P. Yarroll <piggy@acm.org> 391da177e4SLinus Torvalds * Karl Knutson <karl@athena.chicago.il.us> 401da177e4SLinus Torvalds * C. Robin <chris@hundredacre.ac.uk> 411da177e4SLinus Torvalds * Jon Grimm <jgrimm@us.ibm.com> 421da177e4SLinus Torvalds * Xingang Guo <xingang.guo@intel.com> 431da177e4SLinus Torvalds * Dajiang Zhang <dajiang.zhang@nokia.com> 441da177e4SLinus Torvalds * Sridhar Samudrala <sri@us.ibm.com> 451da177e4SLinus Torvalds * Daisy Chang <daisyc@us.ibm.com> 461da177e4SLinus Torvalds * Ardelle Fan <ardelle.fan@intel.com> 471da177e4SLinus Torvalds * Kevin Gao <kevin.gao@intel.com> 481da177e4SLinus Torvalds * 491da177e4SLinus Torvalds * Any bugs reported given to us we will try to fix... any fixes shared will 501da177e4SLinus Torvalds * be incorporated into the next SCTP release. 511da177e4SLinus Torvalds */ 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds #include <linux/types.h> 541da177e4SLinus Torvalds #include <linux/kernel.h> 551da177e4SLinus Torvalds #include <linux/ip.h> 561da177e4SLinus Torvalds #include <linux/ipv6.h> 571da177e4SLinus Torvalds #include <linux/net.h> 581da177e4SLinus Torvalds #include <linux/inet.h> 59ebc3bbcfSChristian Borntraeger #include <linux/scatterlist.h> 601da177e4SLinus Torvalds #include <linux/crypto.h> 615a0e3ad6STejun Heo #include <linux/slab.h> 621da177e4SLinus Torvalds #include <net/sock.h> 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds #include <linux/skbuff.h> 651da177e4SLinus Torvalds #include <linux/random.h> /* for get_random_bytes */ 661da177e4SLinus Torvalds #include <net/sctp/sctp.h> 671da177e4SLinus Torvalds #include <net/sctp/sm.h> 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds SCTP_STATIC 701da177e4SLinus Torvalds struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, 711da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen); 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); 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds /* What was the inbound interface for this chunk? */ 851da177e4SLinus Torvalds int sctp_chunk_iif(const struct sctp_chunk *chunk) 861da177e4SLinus Torvalds { 871da177e4SLinus Torvalds struct sctp_af *af; 881da177e4SLinus Torvalds int iif = 0; 891da177e4SLinus Torvalds 90eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version)); 911da177e4SLinus Torvalds if (af) 921da177e4SLinus Torvalds iif = af->skb_iif(chunk->skb); 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds return iif; 951da177e4SLinus Torvalds } 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 981da177e4SLinus Torvalds * 991da177e4SLinus Torvalds * Note 2: The ECN capable field is reserved for future use of 1001da177e4SLinus Torvalds * Explicit Congestion Notification. 1011da177e4SLinus Torvalds */ 1021da177e4SLinus Torvalds static const struct sctp_paramhdr ecap_param = { 1031da177e4SLinus Torvalds SCTP_PARAM_ECN_CAPABLE, 10409640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1051da177e4SLinus Torvalds }; 1061da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1071da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 10809640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1091da177e4SLinus Torvalds }; 1101da177e4SLinus Torvalds 1115fa782c2SNeil Horman /* A helper to initialize an op error inside a 1121da177e4SLinus Torvalds * provided chunk, as most cause codes will be embedded inside an 1131da177e4SLinus Torvalds * abort chunk. 1141da177e4SLinus Torvalds */ 1155bf2db03SAl Viro void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, 11600f1c2dfSWei Yongjun size_t paylen) 1171da177e4SLinus Torvalds { 1181da177e4SLinus Torvalds sctp_errhdr_t err; 1191da177e4SLinus Torvalds __u16 len; 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds /* Cause code constants are now defined in network order. */ 1221da177e4SLinus Torvalds err.cause = cause_code; 1231da177e4SLinus Torvalds len = sizeof(sctp_errhdr_t) + paylen; 1241da177e4SLinus Torvalds err.length = htons(len); 1254a1c0107SVlad Yasevich chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 1285fa782c2SNeil Horman /* A helper to initialize an op error inside a 1295fa782c2SNeil Horman * provided chunk, as most cause codes will be embedded inside an 1305fa782c2SNeil Horman * abort chunk. Differs from sctp_init_cause in that it won't oops 1315fa782c2SNeil Horman * if there isn't enough space in the op error chunk 1325fa782c2SNeil Horman */ 1335fa782c2SNeil Horman int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code, 1345fa782c2SNeil Horman size_t paylen) 1355fa782c2SNeil Horman { 1365fa782c2SNeil Horman sctp_errhdr_t err; 1375fa782c2SNeil Horman __u16 len; 1385fa782c2SNeil Horman 1395fa782c2SNeil Horman /* Cause code constants are now defined in network order. */ 1405fa782c2SNeil Horman err.cause = cause_code; 1415fa782c2SNeil Horman len = sizeof(sctp_errhdr_t) + paylen; 1425fa782c2SNeil Horman err.length = htons(len); 1435fa782c2SNeil Horman 1445fa782c2SNeil Horman if (skb_tailroom(chunk->skb) > len) 1455fa782c2SNeil Horman return -ENOSPC; 1465fa782c2SNeil Horman chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, 1475fa782c2SNeil Horman sizeof(sctp_errhdr_t), 1485fa782c2SNeil Horman &err); 1495fa782c2SNeil Horman return 0; 1505fa782c2SNeil Horman } 1511da177e4SLinus Torvalds /* 3.3.2 Initiation (INIT) (1) 1521da177e4SLinus Torvalds * 1531da177e4SLinus Torvalds * This chunk is used to initiate a SCTP association between two 1541da177e4SLinus Torvalds * endpoints. The format of the INIT chunk is shown below: 1551da177e4SLinus Torvalds * 1561da177e4SLinus Torvalds * 0 1 2 3 1571da177e4SLinus 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 1581da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1591da177e4SLinus Torvalds * | Type = 1 | Chunk Flags | Chunk Length | 1601da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1611da177e4SLinus Torvalds * | Initiate Tag | 1621da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1631da177e4SLinus Torvalds * | Advertised Receiver Window Credit (a_rwnd) | 1641da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1651da177e4SLinus Torvalds * | Number of Outbound Streams | Number of Inbound Streams | 1661da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1671da177e4SLinus Torvalds * | Initial TSN | 1681da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1691da177e4SLinus Torvalds * \ \ 1701da177e4SLinus Torvalds * / Optional/Variable-Length Parameters / 1711da177e4SLinus Torvalds * \ \ 1721da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1731da177e4SLinus Torvalds * 1741da177e4SLinus Torvalds * 1751da177e4SLinus Torvalds * The INIT chunk contains the following parameters. Unless otherwise 1761da177e4SLinus Torvalds * noted, each parameter MUST only be included once in the INIT chunk. 1771da177e4SLinus Torvalds * 1781da177e4SLinus Torvalds * Fixed Parameters Status 1791da177e4SLinus Torvalds * ---------------------------------------------- 1801da177e4SLinus Torvalds * Initiate Tag Mandatory 1811da177e4SLinus Torvalds * Advertised Receiver Window Credit Mandatory 1821da177e4SLinus Torvalds * Number of Outbound Streams Mandatory 1831da177e4SLinus Torvalds * Number of Inbound Streams Mandatory 1841da177e4SLinus Torvalds * Initial TSN Mandatory 1851da177e4SLinus Torvalds * 1861da177e4SLinus Torvalds * Variable Parameters Status Type Value 1871da177e4SLinus Torvalds * ------------------------------------------------------------- 1881da177e4SLinus Torvalds * IPv4 Address (Note 1) Optional 5 1891da177e4SLinus Torvalds * IPv6 Address (Note 1) Optional 6 1901da177e4SLinus Torvalds * Cookie Preservative Optional 9 1911da177e4SLinus Torvalds * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) 1921da177e4SLinus Torvalds * Host Name Address (Note 3) Optional 11 1931da177e4SLinus Torvalds * Supported Address Types (Note 4) Optional 12 1941da177e4SLinus Torvalds */ 1951da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, 1961da177e4SLinus Torvalds const struct sctp_bind_addr *bp, 197dd0fc66fSAl Viro gfp_t gfp, int vparam_len) 1981da177e4SLinus Torvalds { 1991da177e4SLinus Torvalds sctp_inithdr_t init; 2001da177e4SLinus Torvalds union sctp_params addrs; 2011da177e4SLinus Torvalds size_t chunksize; 2021da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 2031da177e4SLinus Torvalds int num_types, addrs_len = 0; 2041da177e4SLinus Torvalds struct sctp_sock *sp; 2051da177e4SLinus Torvalds sctp_supported_addrs_param_t sat; 2063dbe8656SAl Viro __be16 types[2]; 2070f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 208131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 209131a47e3SVlad Yasevich int num_ext = 0; 210131a47e3SVlad Yasevich __u8 extensions[3]; 211730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 212730fc3d0SVlad Yasevich *auth_hmacs = NULL; 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2151da177e4SLinus Torvalds * 2161da177e4SLinus Torvalds * Note 1: The INIT chunks can contain multiple addresses that 2171da177e4SLinus Torvalds * can be IPv4 and/or IPv6 in any combination. 2181da177e4SLinus Torvalds */ 2191da177e4SLinus Torvalds retval = NULL; 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds /* Convert the provided bind address list to raw format. */ 2221da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds init.init_tag = htonl(asoc->c.my_vtag); 2251da177e4SLinus Torvalds init.a_rwnd = htonl(asoc->rwnd); 2261da177e4SLinus Torvalds init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2271da177e4SLinus Torvalds init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2281da177e4SLinus Torvalds init.initial_tsn = htonl(asoc->c.initial_tsn); 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds /* How many address types are needed? */ 2311da177e4SLinus Torvalds sp = sctp_sk(asoc->base.sk); 2321da177e4SLinus Torvalds num_types = sp->pf->supported_addrs(sp, types); 2331da177e4SLinus Torvalds 234a8170c35SWei Yongjun chunksize = sizeof(init) + addrs_len; 235a8170c35SWei Yongjun chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types)); 2361da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 2378ee4be37SVlad Yasevich 238036b579bSVlad Yasevich if (sctp_prsctp_enable) 239036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 240036b579bSVlad Yasevich 241131a47e3SVlad Yasevich /* ADDIP: Section 4.2.7: 242131a47e3SVlad Yasevich * An implementation supporting this extension [ADDIP] MUST list 243131a47e3SVlad Yasevich * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and 244131a47e3SVlad Yasevich * INIT-ACK parameters. 245131a47e3SVlad Yasevich */ 246131a47e3SVlad Yasevich if (sctp_addip_enable) { 247131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 248131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 249131a47e3SVlad Yasevich num_ext += 2; 250131a47e3SVlad Yasevich } 251131a47e3SVlad Yasevich 2526fc791eeSmalc if (sp->adaptation_ind) 2531da177e4SLinus Torvalds chunksize += sizeof(aiparam); 2546fc791eeSmalc 2551da177e4SLinus Torvalds chunksize += vparam_len; 2561da177e4SLinus Torvalds 257730fc3d0SVlad Yasevich /* Account for AUTH related parameters */ 258730fc3d0SVlad Yasevich if (sctp_auth_enable) { 259730fc3d0SVlad Yasevich /* Add random parameter length*/ 260730fc3d0SVlad Yasevich chunksize += sizeof(asoc->c.auth_random); 261730fc3d0SVlad Yasevich 262730fc3d0SVlad Yasevich /* Add HMACS parameter length if any were defined */ 263730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 264730fc3d0SVlad Yasevich if (auth_hmacs->length) 265a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); 266730fc3d0SVlad Yasevich else 267730fc3d0SVlad Yasevich auth_hmacs = NULL; 268730fc3d0SVlad Yasevich 269730fc3d0SVlad Yasevich /* Add CHUNKS parameter length */ 270730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 271730fc3d0SVlad Yasevich if (auth_chunks->length) 272a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_chunks->length)); 273730fc3d0SVlad Yasevich else 2749baffaa6SVlad Yasevich auth_chunks = NULL; 275730fc3d0SVlad Yasevich 276730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 277730fc3d0SVlad Yasevich num_ext += 1; 278730fc3d0SVlad Yasevich } 279730fc3d0SVlad Yasevich 280131a47e3SVlad Yasevich /* If we have any extensions to report, account for that */ 281131a47e3SVlad Yasevich if (num_ext) 282a8170c35SWei Yongjun chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + 283a8170c35SWei Yongjun num_ext); 284131a47e3SVlad Yasevich 2851da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2861da177e4SLinus Torvalds * 2871da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 2881da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 2891da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 2901da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 2911da177e4SLinus Torvalds * other address types if the Host Name address parameter is 2921da177e4SLinus Torvalds * present in the received INIT chunk. 2931da177e4SLinus Torvalds * 2941da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 2951da177e4SLinus Torvalds */ 2961da177e4SLinus Torvalds 2971da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize); 2981da177e4SLinus Torvalds if (!retval) 2991da177e4SLinus Torvalds goto nodata; 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds retval->subh.init_hdr = 3021da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 3031da177e4SLinus Torvalds retval->param_hdr.v = 3041da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3071da177e4SLinus Torvalds * 3081da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 3091da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 3101da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 3111da177e4SLinus Torvalds * support any address type. 3121da177e4SLinus Torvalds */ 3131da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 3141da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 3151da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 3161da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 319131a47e3SVlad Yasevich 3207aa1b54bSJoe Perches /* Add the supported extensions parameter. Be nice and add this 321131a47e3SVlad Yasevich * fist before addiding the parameters for the extensions themselves 322131a47e3SVlad Yasevich */ 323131a47e3SVlad Yasevich if (num_ext) { 324131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 325131a47e3SVlad Yasevich ext_param.param_hdr.length = 326131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 327131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 328131a47e3SVlad Yasevich &ext_param); 3298ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 330131a47e3SVlad Yasevich } 331131a47e3SVlad Yasevich 3321da177e4SLinus Torvalds if (sctp_prsctp_enable) 3331da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 334131a47e3SVlad Yasevich 3356fc791eeSmalc if (sp->adaptation_ind) { 3360f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 3371da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3380f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sp->adaptation_ind); 3391da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 3406fc791eeSmalc } 341131a47e3SVlad Yasevich 342730fc3d0SVlad Yasevich /* Add SCTP-AUTH chunks to the parameter list */ 343730fc3d0SVlad Yasevich if (sctp_auth_enable) { 344730fc3d0SVlad Yasevich sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), 345730fc3d0SVlad Yasevich asoc->c.auth_random); 346730fc3d0SVlad Yasevich if (auth_hmacs) 347730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 348730fc3d0SVlad Yasevich auth_hmacs); 349730fc3d0SVlad Yasevich if (auth_chunks) 350730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 351730fc3d0SVlad Yasevich auth_chunks); 352730fc3d0SVlad Yasevich } 3531da177e4SLinus Torvalds nodata: 3541da177e4SLinus Torvalds kfree(addrs.v); 3551da177e4SLinus Torvalds return retval; 3561da177e4SLinus Torvalds } 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 3591da177e4SLinus Torvalds const struct sctp_chunk *chunk, 360dd0fc66fSAl Viro gfp_t gfp, int unkparam_len) 3611da177e4SLinus Torvalds { 3621da177e4SLinus Torvalds sctp_inithdr_t initack; 3631da177e4SLinus Torvalds struct sctp_chunk *retval; 3641da177e4SLinus Torvalds union sctp_params addrs; 3656fc791eeSmalc struct sctp_sock *sp; 3661da177e4SLinus Torvalds int addrs_len; 3671da177e4SLinus Torvalds sctp_cookie_param_t *cookie; 3681da177e4SLinus Torvalds int cookie_len; 3691da177e4SLinus Torvalds size_t chunksize; 3700f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 371131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 372131a47e3SVlad Yasevich int num_ext = 0; 373131a47e3SVlad Yasevich __u8 extensions[3]; 374730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 375730fc3d0SVlad Yasevich *auth_hmacs = NULL, 376730fc3d0SVlad Yasevich *auth_random = NULL; 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds retval = NULL; 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 3811da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 3841da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 3851da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 3861da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 3871da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 3901da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 3911da177e4SLinus Torvalds */ 3921da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 3931da177e4SLinus Torvalds addrs.v, addrs_len); 3941da177e4SLinus Torvalds if (!cookie) 3951da177e4SLinus Torvalds goto nomem_cookie; 3961da177e4SLinus Torvalds 3971da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 3981da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 3991da177e4SLinus Torvalds */ 4006fc791eeSmalc sp = sctp_sk(asoc->base.sk); 4011da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 4041da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4051da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 4061da177e4SLinus Torvalds 4075ffad5acSWei Yongjun if (asoc->peer.prsctp_capable) 408036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 409036b579bSVlad Yasevich 4105ffad5acSWei Yongjun if (asoc->peer.asconf_capable) { 411131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 412131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 413131a47e3SVlad Yasevich num_ext += 2; 414131a47e3SVlad Yasevich } 415131a47e3SVlad Yasevich 4166fc791eeSmalc if (sp->adaptation_ind) 4171da177e4SLinus Torvalds chunksize += sizeof(aiparam); 4181da177e4SLinus Torvalds 419730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 420730fc3d0SVlad Yasevich auth_random = (sctp_paramhdr_t *)asoc->c.auth_random; 421730fc3d0SVlad Yasevich chunksize += ntohs(auth_random->length); 422730fc3d0SVlad Yasevich 423730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 424730fc3d0SVlad Yasevich if (auth_hmacs->length) 425a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); 426730fc3d0SVlad Yasevich else 427730fc3d0SVlad Yasevich auth_hmacs = NULL; 428730fc3d0SVlad Yasevich 429730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 430730fc3d0SVlad Yasevich if (auth_chunks->length) 431a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_chunks->length)); 432730fc3d0SVlad Yasevich else 433730fc3d0SVlad Yasevich auth_chunks = NULL; 434730fc3d0SVlad Yasevich 435730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 436730fc3d0SVlad Yasevich num_ext += 1; 437730fc3d0SVlad Yasevich } 438730fc3d0SVlad Yasevich 4398ee4be37SVlad Yasevich if (num_ext) 440a8170c35SWei Yongjun chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + 441a8170c35SWei Yongjun num_ext); 4428ee4be37SVlad Yasevich 4431da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 4441da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize); 4451da177e4SLinus Torvalds if (!retval) 4461da177e4SLinus Torvalds goto nomem_chunk; 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds /* Per the advice in RFC 2960 6.4, send this reply to 4491da177e4SLinus Torvalds * the source of the INIT packet. 4501da177e4SLinus Torvalds */ 4511da177e4SLinus Torvalds retval->transport = chunk->transport; 4521da177e4SLinus Torvalds retval->subh.init_hdr = 4531da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 4541da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 4551da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 4561da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4571da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 458131a47e3SVlad Yasevich if (num_ext) { 459131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 460131a47e3SVlad Yasevich ext_param.param_hdr.length = 461131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 462131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 463131a47e3SVlad Yasevich &ext_param); 4648ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 465131a47e3SVlad Yasevich } 4661da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 4671da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 4681da177e4SLinus Torvalds 4696fc791eeSmalc if (sp->adaptation_ind) { 4700f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 4711da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 4726fc791eeSmalc aiparam.adaptation_ind = htonl(sp->adaptation_ind); 4731da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 4746fc791eeSmalc } 4751da177e4SLinus Torvalds 476730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 477730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_random->length), 478730fc3d0SVlad Yasevich auth_random); 479730fc3d0SVlad Yasevich if (auth_hmacs) 480730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 481730fc3d0SVlad Yasevich auth_hmacs); 482730fc3d0SVlad Yasevich if (auth_chunks) 483730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 484730fc3d0SVlad Yasevich auth_chunks); 485730fc3d0SVlad Yasevich } 486730fc3d0SVlad Yasevich 4871da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 4881da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 4911da177e4SLinus Torvalds * 4921da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 4931da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 4941da177e4SLinus Torvalds * address from which it received the DATA or control chunk 4951da177e4SLinus Torvalds * to which it is replying. 4961da177e4SLinus Torvalds * 4971da177e4SLinus Torvalds * [INIT ACK back to where the INIT came from.] 4981da177e4SLinus Torvalds */ 4991da177e4SLinus Torvalds if (chunk) 5001da177e4SLinus Torvalds retval->transport = chunk->transport; 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds nomem_chunk: 5031da177e4SLinus Torvalds kfree(cookie); 5041da177e4SLinus Torvalds nomem_cookie: 5051da177e4SLinus Torvalds kfree(addrs.v); 5061da177e4SLinus Torvalds return retval; 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 5101da177e4SLinus Torvalds * 5111da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 5121da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 5131da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 5141da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 5151da177e4SLinus Torvalds * chunks in the same packet. 5161da177e4SLinus Torvalds * 5171da177e4SLinus Torvalds * 0 1 2 3 5181da177e4SLinus 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 5191da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5201da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 5211da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5221da177e4SLinus Torvalds * / Cookie / 5231da177e4SLinus Torvalds * \ \ 5241da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5251da177e4SLinus Torvalds * 5261da177e4SLinus Torvalds * Chunk Flags: 8 bit 5271da177e4SLinus Torvalds * 5281da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5291da177e4SLinus Torvalds * 5301da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 5311da177e4SLinus Torvalds * 5321da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 5331da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 5341da177e4SLinus Torvalds * 5351da177e4SLinus Torvalds * Cookie: variable size 5361da177e4SLinus Torvalds * 5371da177e4SLinus Torvalds * This field must contain the exact cookie received in the 5381da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 5391da177e4SLinus Torvalds * 5401da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 5411da177e4SLinus Torvalds * to insure interoperability. 5421da177e4SLinus Torvalds */ 5431da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 5441da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5451da177e4SLinus Torvalds { 5461da177e4SLinus Torvalds struct sctp_chunk *retval; 5471da177e4SLinus Torvalds void *cookie; 5481da177e4SLinus Torvalds int cookie_len; 5491da177e4SLinus Torvalds 5501da177e4SLinus Torvalds cookie = asoc->peer.cookie; 5511da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 5541da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len); 5551da177e4SLinus Torvalds if (!retval) 5561da177e4SLinus Torvalds goto nodata; 5571da177e4SLinus Torvalds retval->subh.cookie_hdr = 5581da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5611da177e4SLinus Torvalds * 5621da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5631da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5641da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5651da177e4SLinus Torvalds * to which it is replying. 5661da177e4SLinus Torvalds * 5671da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 5681da177e4SLinus Torvalds */ 5691da177e4SLinus Torvalds if (chunk) 5701da177e4SLinus Torvalds retval->transport = chunk->transport; 5711da177e4SLinus Torvalds 5721da177e4SLinus Torvalds nodata: 5731da177e4SLinus Torvalds return retval; 5741da177e4SLinus Torvalds } 5751da177e4SLinus Torvalds 5761da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 5771da177e4SLinus Torvalds * 5781da177e4SLinus Torvalds * This chunk is used only during the initialization of an 5791da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 5801da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 5811da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 5821da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 5831da177e4SLinus Torvalds * 5841da177e4SLinus Torvalds * 0 1 2 3 5851da177e4SLinus 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 5861da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5871da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 5881da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5891da177e4SLinus Torvalds * 5901da177e4SLinus Torvalds * Chunk Flags: 8 bits 5911da177e4SLinus Torvalds * 5921da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5931da177e4SLinus Torvalds */ 5941da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 5951da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5961da177e4SLinus Torvalds { 5971da177e4SLinus Torvalds struct sctp_chunk *retval; 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0); 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6021da177e4SLinus Torvalds * 6031da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6041da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6051da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6061da177e4SLinus Torvalds * to which it is replying. 6071da177e4SLinus Torvalds * 6081da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 6091da177e4SLinus Torvalds */ 6101da177e4SLinus Torvalds if (retval && chunk) 6111da177e4SLinus Torvalds retval->transport = chunk->transport; 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds return retval; 6141da177e4SLinus Torvalds } 6151da177e4SLinus Torvalds 6161da177e4SLinus Torvalds /* 6171da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 6181da177e4SLinus Torvalds * CWR: 6191da177e4SLinus Torvalds * 6201da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 6211da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 6221da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 6231da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 6241da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 6251da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 6261da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 6271da177e4SLinus Torvalds * CE bit. 6281da177e4SLinus Torvalds * 6291da177e4SLinus Torvalds * 0 1 2 3 6301da177e4SLinus 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 6311da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6321da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 6331da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6341da177e4SLinus Torvalds * | Lowest TSN Number | 6351da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6361da177e4SLinus Torvalds * 6371da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 6381da177e4SLinus Torvalds */ 6391da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 6401da177e4SLinus Torvalds const __u32 lowest_tsn, 6411da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6421da177e4SLinus Torvalds { 6431da177e4SLinus Torvalds struct sctp_chunk *retval; 6441da177e4SLinus Torvalds sctp_cwrhdr_t cwr; 6451da177e4SLinus Torvalds 6461da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 6471da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0, 6481da177e4SLinus Torvalds sizeof(sctp_cwrhdr_t)); 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds if (!retval) 6511da177e4SLinus Torvalds goto nodata; 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 6541da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 6551da177e4SLinus Torvalds 6561da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6571da177e4SLinus Torvalds * 6581da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6591da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6601da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6611da177e4SLinus Torvalds * to which it is replying. 6621da177e4SLinus Torvalds * 6631da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 6641da177e4SLinus Torvalds * came from.] 6651da177e4SLinus Torvalds */ 6661da177e4SLinus Torvalds if (chunk) 6671da177e4SLinus Torvalds retval->transport = chunk->transport; 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds nodata: 6701da177e4SLinus Torvalds return retval; 6711da177e4SLinus Torvalds } 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 6741da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 6751da177e4SLinus Torvalds const __u32 lowest_tsn) 6761da177e4SLinus Torvalds { 6771da177e4SLinus Torvalds struct sctp_chunk *retval; 6781da177e4SLinus Torvalds sctp_ecnehdr_t ecne; 6791da177e4SLinus Torvalds 6801da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 6811da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0, 6821da177e4SLinus Torvalds sizeof(sctp_ecnehdr_t)); 6831da177e4SLinus Torvalds if (!retval) 6841da177e4SLinus Torvalds goto nodata; 6851da177e4SLinus Torvalds retval->subh.ecne_hdr = 6861da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds nodata: 6891da177e4SLinus Torvalds return retval; 6901da177e4SLinus Torvalds } 6911da177e4SLinus Torvalds 6921da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 6931da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 6941da177e4SLinus Torvalds */ 6951da177e4SLinus Torvalds struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, 6961da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 6971da177e4SLinus Torvalds int data_len, __u8 flags, __u16 ssn) 6981da177e4SLinus Torvalds { 6991da177e4SLinus Torvalds struct sctp_chunk *retval; 7001da177e4SLinus Torvalds struct sctp_datahdr dp; 7011da177e4SLinus Torvalds int chunk_len; 7021da177e4SLinus Torvalds 7031da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 7041da177e4SLinus Torvalds * creating the chunk. 7051da177e4SLinus Torvalds */ 7061da177e4SLinus Torvalds dp.tsn = 0; 7071da177e4SLinus Torvalds dp.stream = htons(sinfo->sinfo_stream); 7081da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 711eaa5c54dSIvan Skytte Jorgensen if (sinfo->sinfo_flags & SCTP_UNORDERED) { 7121da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 7131da177e4SLinus Torvalds dp.ssn = 0; 7141da177e4SLinus Torvalds } else 7151da177e4SLinus Torvalds dp.ssn = htons(ssn); 7161da177e4SLinus Torvalds 7171da177e4SLinus Torvalds chunk_len = sizeof(dp) + data_len; 7181da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len); 7191da177e4SLinus Torvalds if (!retval) 7201da177e4SLinus Torvalds goto nodata; 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 7231da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 7241da177e4SLinus Torvalds 7251da177e4SLinus Torvalds nodata: 7261da177e4SLinus Torvalds return retval; 7271da177e4SLinus Torvalds } 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 7301da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 7311da177e4SLinus Torvalds * including duplicates and gaps. 7321da177e4SLinus Torvalds */ 7331da177e4SLinus Torvalds struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) 7341da177e4SLinus Torvalds { 7351da177e4SLinus Torvalds struct sctp_chunk *retval; 7361da177e4SLinus Torvalds struct sctp_sackhdr sack; 7371da177e4SLinus Torvalds int len; 7381da177e4SLinus Torvalds __u32 ctsn; 7391da177e4SLinus Torvalds __u16 num_gabs, num_dup_tsns; 7401da177e4SLinus Torvalds struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 74102015180SVlad Yasevich struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; 7421da177e4SLinus Torvalds 74302015180SVlad Yasevich memset(gabs, 0, sizeof(gabs)); 7441da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 7451da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn); 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 74802015180SVlad Yasevich num_gabs = sctp_tsnmap_num_gabs(map, gabs); 7491da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 7501da177e4SLinus Torvalds 7511da177e4SLinus Torvalds /* Initialize the SACK header. */ 7521da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 7531da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 7541da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 7551da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 7561da177e4SLinus Torvalds 7571da177e4SLinus Torvalds len = sizeof(sack) 7581da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 7591da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 7601da177e4SLinus Torvalds 7611da177e4SLinus Torvalds /* Create the chunk. */ 7621da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len); 7631da177e4SLinus Torvalds if (!retval) 7641da177e4SLinus Torvalds goto nodata; 7651da177e4SLinus Torvalds 7661da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7671da177e4SLinus Torvalds * 7681da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 7691da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 7701da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 7711da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 7721da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 7731da177e4SLinus Torvalds * reply chunk. 7741da177e4SLinus Torvalds * 7751da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 7761da177e4SLinus Torvalds * in packets from different source addresses in a single 7771da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 7781da177e4SLinus Torvalds * destination transport addresses from which the DATA or 7791da177e4SLinus Torvalds * control chunks being acknowledged were received. 7801da177e4SLinus Torvalds * 7811da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 7821da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 7831da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 7841da177e4SLinus Torvalds * duplicates. --piggy] 7851da177e4SLinus Torvalds * 7861da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 7871da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 7881da177e4SLinus Torvalds * destination address and not use the source address of the 7891da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 7901da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 7911da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 7921da177e4SLinus Torvalds * for the SACK is broken. 7931da177e4SLinus Torvalds * 7941da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 7951da177e4SLinus Torvalds */ 7961da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds retval->subh.sack_hdr = 7991da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 8001da177e4SLinus Torvalds 8011da177e4SLinus Torvalds /* Add the gap ack block information. */ 8021da177e4SLinus Torvalds if (num_gabs) 8031da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 80402015180SVlad Yasevich gabs); 8051da177e4SLinus Torvalds 8061da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 8071da177e4SLinus Torvalds if (num_dup_tsns) 8081da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 8091da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 8101da177e4SLinus Torvalds 8111da177e4SLinus Torvalds nodata: 8121da177e4SLinus Torvalds return retval; 8131da177e4SLinus Torvalds } 8141da177e4SLinus Torvalds 8151da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 8161da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 8171da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8181da177e4SLinus Torvalds { 8191da177e4SLinus Torvalds struct sctp_chunk *retval; 8201da177e4SLinus Torvalds sctp_shutdownhdr_t shut; 8211da177e4SLinus Torvalds __u32 ctsn; 8221da177e4SLinus Torvalds 8231da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 8241da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 8251da177e4SLinus Torvalds 8261da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0, 8271da177e4SLinus Torvalds sizeof(sctp_shutdownhdr_t)); 8281da177e4SLinus Torvalds if (!retval) 8291da177e4SLinus Torvalds goto nodata; 8301da177e4SLinus Torvalds 8311da177e4SLinus Torvalds retval->subh.shutdown_hdr = 8321da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 8331da177e4SLinus Torvalds 8341da177e4SLinus Torvalds if (chunk) 8351da177e4SLinus Torvalds retval->transport = chunk->transport; 8361da177e4SLinus Torvalds nodata: 8371da177e4SLinus Torvalds return retval; 8381da177e4SLinus Torvalds } 8391da177e4SLinus Torvalds 8401da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8411da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8421da177e4SLinus Torvalds { 8431da177e4SLinus Torvalds struct sctp_chunk *retval; 8441da177e4SLinus Torvalds 8451da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0); 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8481da177e4SLinus Torvalds * 8491da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8501da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8511da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8521da177e4SLinus Torvalds * to which it is replying. 8531da177e4SLinus Torvalds * 8541da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 8551da177e4SLinus Torvalds */ 8561da177e4SLinus Torvalds if (retval && chunk) 8571da177e4SLinus Torvalds retval->transport = chunk->transport; 8581da177e4SLinus Torvalds 8591da177e4SLinus Torvalds return retval; 8601da177e4SLinus Torvalds } 8611da177e4SLinus Torvalds 8621da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 8631da177e4SLinus Torvalds const struct sctp_association *asoc, 8641da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8651da177e4SLinus Torvalds { 8661da177e4SLinus Torvalds struct sctp_chunk *retval; 8671da177e4SLinus Torvalds __u8 flags = 0; 8681da177e4SLinus Torvalds 869047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 870047a2428SJerome Forissier * reflected) 871047a2428SJerome Forissier */ 8721da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 8731da177e4SLinus Torvalds 8741da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0); 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8771da177e4SLinus Torvalds * 8781da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8791da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8801da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8811da177e4SLinus Torvalds * to which it is replying. 8821da177e4SLinus Torvalds * 8831da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 8841da177e4SLinus Torvalds * came from.] 8851da177e4SLinus Torvalds */ 8861da177e4SLinus Torvalds if (retval && chunk) 8871da177e4SLinus Torvalds retval->transport = chunk->transport; 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds return retval; 8901da177e4SLinus Torvalds } 8911da177e4SLinus Torvalds 8921da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 893047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 8941da177e4SLinus Torvalds */ 8951da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 8961da177e4SLinus Torvalds const struct sctp_chunk *chunk, 8971da177e4SLinus Torvalds const size_t hint) 8981da177e4SLinus Torvalds { 8991da177e4SLinus Torvalds struct sctp_chunk *retval; 9001da177e4SLinus Torvalds __u8 flags = 0; 9011da177e4SLinus Torvalds 902047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 903047a2428SJerome Forissier * an INIT (vtag will be reflected). 904047a2428SJerome Forissier */ 905047a2428SJerome Forissier if (!asoc) { 906047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 907047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 908047a2428SJerome Forissier flags = 0; 909047a2428SJerome Forissier else 910047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 911047a2428SJerome Forissier } 9121da177e4SLinus Torvalds 9131da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint); 9141da177e4SLinus Torvalds 9151da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9161da177e4SLinus Torvalds * 9171da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9181da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9191da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9201da177e4SLinus Torvalds * to which it is replying. 9211da177e4SLinus Torvalds * 9221da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9231da177e4SLinus Torvalds */ 9241da177e4SLinus Torvalds if (retval && chunk) 9251da177e4SLinus Torvalds retval->transport = chunk->transport; 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds return retval; 9281da177e4SLinus Torvalds } 9291da177e4SLinus Torvalds 9301da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 9311da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 9321da177e4SLinus Torvalds const struct sctp_association *asoc, 9331da177e4SLinus Torvalds const struct sctp_chunk *chunk, __u32 tsn) 9341da177e4SLinus Torvalds { 9351da177e4SLinus Torvalds struct sctp_chunk *retval; 9369f81bcd9SAl Viro __be32 payload; 9371da177e4SLinus Torvalds 9381da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) 9391da177e4SLinus Torvalds + sizeof(tsn)); 9401da177e4SLinus Torvalds 9411da177e4SLinus Torvalds if (!retval) 9421da177e4SLinus Torvalds goto no_mem; 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 9451da177e4SLinus Torvalds payload = htonl(tsn); 94600f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 94700f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 9481da177e4SLinus Torvalds 9491da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9501da177e4SLinus Torvalds * 9511da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9521da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9531da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9541da177e4SLinus Torvalds * to which it is replying. 9551da177e4SLinus Torvalds * 9561da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9571da177e4SLinus Torvalds */ 9581da177e4SLinus Torvalds if (chunk) 9591da177e4SLinus Torvalds retval->transport = chunk->transport; 9601da177e4SLinus Torvalds 9611da177e4SLinus Torvalds no_mem: 9621da177e4SLinus Torvalds return retval; 9631da177e4SLinus Torvalds } 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 9661da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 967c164a9baSSridhar Samudrala const struct msghdr *msg, 968c164a9baSSridhar Samudrala size_t paylen) 9691da177e4SLinus Torvalds { 9701da177e4SLinus Torvalds struct sctp_chunk *retval; 971c164a9baSSridhar Samudrala void *payload = NULL; 972c164a9baSSridhar Samudrala int err; 9731da177e4SLinus Torvalds 974c164a9baSSridhar Samudrala retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); 9751da177e4SLinus Torvalds if (!retval) 9761da177e4SLinus Torvalds goto err_chunk; 9771da177e4SLinus Torvalds 9781da177e4SLinus Torvalds if (paylen) { 9791da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 980c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 9811da177e4SLinus Torvalds if (!payload) 9821da177e4SLinus Torvalds goto err_payload; 9831da177e4SLinus Torvalds 984c164a9baSSridhar Samudrala err = memcpy_fromiovec(payload, msg->msg_iov, paylen); 985c164a9baSSridhar Samudrala if (err < 0) 9861da177e4SLinus Torvalds goto err_copy; 9871da177e4SLinus Torvalds } 9881da177e4SLinus Torvalds 98900f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 99000f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds if (paylen) 9931da177e4SLinus Torvalds kfree(payload); 9941da177e4SLinus Torvalds 9951da177e4SLinus Torvalds return retval; 9961da177e4SLinus Torvalds 9971da177e4SLinus Torvalds err_copy: 9981da177e4SLinus Torvalds kfree(payload); 9991da177e4SLinus Torvalds err_payload: 10001da177e4SLinus Torvalds sctp_chunk_free(retval); 10011da177e4SLinus Torvalds retval = NULL; 10021da177e4SLinus Torvalds err_chunk: 10031da177e4SLinus Torvalds return retval; 10041da177e4SLinus Torvalds } 10051da177e4SLinus Torvalds 10065c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 10075c94bf86SAdrian Bunk * enough. 10085c94bf86SAdrian Bunk */ 10095c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 10105c94bf86SAdrian Bunk const void *data) 10115c94bf86SAdrian Bunk { 10125c94bf86SAdrian Bunk void *target; 10135c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 10145c94bf86SAdrian Bunk 10155c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 10165c94bf86SAdrian Bunk 10176383cfb3SVlad Yasevich if (data) 10185c94bf86SAdrian Bunk memcpy(target, data, len); 10196383cfb3SVlad Yasevich else 10206383cfb3SVlad Yasevich memset(target, 0, len); 10215c94bf86SAdrian Bunk 10225c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 10235c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 10245c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 10255c94bf86SAdrian Bunk 10265c94bf86SAdrian Bunk return target; 10275c94bf86SAdrian Bunk } 10285c94bf86SAdrian Bunk 10291da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 10301da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 10311da177e4SLinus Torvalds const struct sctp_association *asoc, 10321da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10331da177e4SLinus Torvalds const __u8 *payload, 10341da177e4SLinus Torvalds const size_t paylen) 10351da177e4SLinus Torvalds { 10361da177e4SLinus Torvalds struct sctp_chunk *retval; 10371da177e4SLinus Torvalds struct sctp_paramhdr phdr; 10381da177e4SLinus Torvalds 10391da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen 104000f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10411da177e4SLinus Torvalds if (!retval) 10421da177e4SLinus Torvalds goto end; 10431da177e4SLinus Torvalds 104400f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen 104500f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10461da177e4SLinus Torvalds 10471da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 10481da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 104900f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 105000f1c2dfSWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr); 10511da177e4SLinus Torvalds 10521da177e4SLinus Torvalds end: 10531da177e4SLinus Torvalds return retval; 10541da177e4SLinus Torvalds } 10551da177e4SLinus Torvalds 1056ba016670SWei Yongjun struct sctp_chunk *sctp_make_violation_paramlen( 1057ba016670SWei Yongjun const struct sctp_association *asoc, 1058ba016670SWei Yongjun const struct sctp_chunk *chunk, 1059ba016670SWei Yongjun struct sctp_paramhdr *param) 1060ba016670SWei Yongjun { 1061ba016670SWei Yongjun struct sctp_chunk *retval; 1062ba016670SWei Yongjun static const char error[] = "The following parameter had invalid length:"; 1063ba016670SWei Yongjun size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) + 1064ba016670SWei Yongjun sizeof(sctp_paramhdr_t); 1065ba016670SWei Yongjun 1066ba016670SWei Yongjun retval = sctp_make_abort(asoc, chunk, payload_len); 1067ba016670SWei Yongjun if (!retval) 1068ba016670SWei Yongjun goto nodata; 1069ba016670SWei Yongjun 1070ba016670SWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, 1071ba016670SWei Yongjun sizeof(error) + sizeof(sctp_paramhdr_t)); 1072ba016670SWei Yongjun sctp_addto_chunk(retval, sizeof(error), error); 1073ba016670SWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param); 1074ba016670SWei Yongjun 1075ba016670SWei Yongjun nodata: 1076ba016670SWei Yongjun return retval; 1077ba016670SWei Yongjun } 1078ba016670SWei Yongjun 10791da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 10801da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 10811da177e4SLinus Torvalds const struct sctp_transport *transport, 10821da177e4SLinus Torvalds const void *payload, const size_t paylen) 10831da177e4SLinus Torvalds { 10841da177e4SLinus Torvalds struct sctp_chunk *retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT, 10851da177e4SLinus Torvalds 0, paylen); 10861da177e4SLinus Torvalds 10871da177e4SLinus Torvalds if (!retval) 10881da177e4SLinus Torvalds goto nodata; 10891da177e4SLinus Torvalds 10901da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 10911da177e4SLinus Torvalds * what transport it belongs to. 10921da177e4SLinus Torvalds */ 10931da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 10941da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 10951da177e4SLinus Torvalds 10961da177e4SLinus Torvalds nodata: 10971da177e4SLinus Torvalds return retval; 10981da177e4SLinus Torvalds } 10991da177e4SLinus Torvalds 11001da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 11011da177e4SLinus Torvalds const struct sctp_chunk *chunk, 11021da177e4SLinus Torvalds const void *payload, const size_t paylen) 11031da177e4SLinus Torvalds { 11041da177e4SLinus Torvalds struct sctp_chunk *retval; 11051da177e4SLinus Torvalds 11061da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen); 11071da177e4SLinus Torvalds if (!retval) 11081da177e4SLinus Torvalds goto nodata; 11091da177e4SLinus Torvalds 11101da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 11111da177e4SLinus Torvalds 11121da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11131da177e4SLinus Torvalds * 11141da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11151da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 11161da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 11171da177e4SLinus Torvalds * to which it is replying. 11181da177e4SLinus Torvalds * 11191da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 11201da177e4SLinus Torvalds */ 11211da177e4SLinus Torvalds if (chunk) 11221da177e4SLinus Torvalds retval->transport = chunk->transport; 11231da177e4SLinus Torvalds 11241da177e4SLinus Torvalds nodata: 11251da177e4SLinus Torvalds return retval; 11261da177e4SLinus Torvalds } 11271da177e4SLinus Torvalds 11281da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 11291da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 11301da177e4SLinus Torvalds */ 11311da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 11321da177e4SLinus Torvalds const struct sctp_association *asoc, 11331da177e4SLinus Torvalds const struct sctp_chunk *chunk, 11341da177e4SLinus Torvalds size_t size) 11351da177e4SLinus Torvalds { 11361da177e4SLinus Torvalds struct sctp_chunk *retval; 11371da177e4SLinus Torvalds 11381da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0, 11391da177e4SLinus Torvalds sizeof(sctp_errhdr_t) + size); 11401da177e4SLinus Torvalds if (!retval) 11411da177e4SLinus Torvalds goto nodata; 11421da177e4SLinus Torvalds 11431da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11441da177e4SLinus Torvalds * 11451da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11461da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 11471da177e4SLinus Torvalds * address from which it received the DATA or control chunk 11481da177e4SLinus Torvalds * to which it is replying. 11491da177e4SLinus Torvalds * 11501da177e4SLinus Torvalds */ 11511da177e4SLinus Torvalds if (chunk) 11521da177e4SLinus Torvalds retval->transport = chunk->transport; 11531da177e4SLinus Torvalds 11541da177e4SLinus Torvalds nodata: 11551da177e4SLinus Torvalds return retval; 11561da177e4SLinus Torvalds } 11571da177e4SLinus Torvalds 11585fa782c2SNeil Horman /* Create an Operation Error chunk of a fixed size, 11595fa782c2SNeil Horman * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) 11605fa782c2SNeil Horman * This is a helper function to allocate an error chunk for 11615fa782c2SNeil Horman * for those invalid parameter codes in which we may not want 11625fa782c2SNeil Horman * to report all the errors, if the incomming chunk is large 11635fa782c2SNeil Horman */ 11645fa782c2SNeil Horman static inline struct sctp_chunk *sctp_make_op_error_fixed( 11655fa782c2SNeil Horman const struct sctp_association *asoc, 11665fa782c2SNeil Horman const struct sctp_chunk *chunk) 11675fa782c2SNeil Horman { 11685fa782c2SNeil Horman size_t size = asoc ? asoc->pathmtu : 0; 11695fa782c2SNeil Horman 11705fa782c2SNeil Horman if (!size) 11715fa782c2SNeil Horman size = SCTP_DEFAULT_MAXSEGMENT; 11725fa782c2SNeil Horman 11735fa782c2SNeil Horman return sctp_make_op_error_space(asoc, chunk, size); 11745fa782c2SNeil Horman } 11755fa782c2SNeil Horman 11761da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 11771da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 11781da177e4SLinus Torvalds const struct sctp_chunk *chunk, 117963706c5cSAl Viro __be16 cause_code, const void *payload, 11806383cfb3SVlad Yasevich size_t paylen, size_t reserve_tail) 11811da177e4SLinus Torvalds { 11821da177e4SLinus Torvalds struct sctp_chunk *retval; 11831da177e4SLinus Torvalds 11846383cfb3SVlad Yasevich retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); 11851da177e4SLinus Torvalds if (!retval) 11861da177e4SLinus Torvalds goto nodata; 11871da177e4SLinus Torvalds 11886383cfb3SVlad Yasevich sctp_init_cause(retval, cause_code, paylen + reserve_tail); 118900f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 11906383cfb3SVlad Yasevich if (reserve_tail) 11916383cfb3SVlad Yasevich sctp_addto_param(retval, reserve_tail, NULL); 11921da177e4SLinus Torvalds 11931da177e4SLinus Torvalds nodata: 11941da177e4SLinus Torvalds return retval; 11951da177e4SLinus Torvalds } 11961da177e4SLinus Torvalds 11974cd57c80SVlad Yasevich struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) 11984cd57c80SVlad Yasevich { 11994cd57c80SVlad Yasevich struct sctp_chunk *retval; 12004cd57c80SVlad Yasevich struct sctp_hmac *hmac_desc; 12014cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 12024cd57c80SVlad Yasevich __u8 *hmac; 12034cd57c80SVlad Yasevich 12044cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 12054cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 12064cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 12074cd57c80SVlad Yasevich return NULL; 12084cd57c80SVlad Yasevich 12094cd57c80SVlad Yasevich retval = sctp_make_chunk(asoc, SCTP_CID_AUTH, 0, 12104cd57c80SVlad Yasevich hmac_desc->hmac_len + sizeof(sctp_authhdr_t)); 12114cd57c80SVlad Yasevich if (!retval) 12124cd57c80SVlad Yasevich return NULL; 12134cd57c80SVlad Yasevich 12144cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 12154cd57c80SVlad Yasevich auth_hdr.shkey_id = htons(asoc->active_key_id); 12164cd57c80SVlad Yasevich 12174cd57c80SVlad Yasevich retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t), 12184cd57c80SVlad Yasevich &auth_hdr); 12194cd57c80SVlad Yasevich 12204cd57c80SVlad Yasevich hmac = skb_put(retval->skb, hmac_desc->hmac_len); 12214cd57c80SVlad Yasevich memset(hmac, 0, hmac_desc->hmac_len); 12224cd57c80SVlad Yasevich 12234cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 12244cd57c80SVlad Yasevich retval->chunk_hdr->length = 12254cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 12264cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 12274cd57c80SVlad Yasevich 12284cd57c80SVlad Yasevich return retval; 12294cd57c80SVlad Yasevich } 12304cd57c80SVlad Yasevich 12314cd57c80SVlad Yasevich 12321da177e4SLinus Torvalds /******************************************************************** 12331da177e4SLinus Torvalds * 2nd Level Abstractions 12341da177e4SLinus Torvalds ********************************************************************/ 12351da177e4SLinus Torvalds 12361da177e4SLinus Torvalds /* Turn an skb into a chunk. 12371da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 12381da177e4SLinus Torvalds */ 12391da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 12401da177e4SLinus Torvalds const struct sctp_association *asoc, 12411da177e4SLinus Torvalds struct sock *sk) 12421da177e4SLinus Torvalds { 12431da177e4SLinus Torvalds struct sctp_chunk *retval; 12441da177e4SLinus Torvalds 1245c3762229SRobert P. J. Day retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC); 12461da177e4SLinus Torvalds 12471da177e4SLinus Torvalds if (!retval) 12481da177e4SLinus Torvalds goto nodata; 12491da177e4SLinus Torvalds 12501da177e4SLinus Torvalds if (!sk) { 12511da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb); 12521da177e4SLinus Torvalds } 12531da177e4SLinus Torvalds 125479af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 12551da177e4SLinus Torvalds retval->skb = skb; 12561da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 12571da177e4SLinus Torvalds retval->resent = 0; 12581da177e4SLinus Torvalds retval->has_tsn = 0; 12591da177e4SLinus Torvalds retval->has_ssn = 0; 12601da177e4SLinus Torvalds retval->rtt_in_progress = 0; 12611da177e4SLinus Torvalds retval->sent_at = 0; 12621da177e4SLinus Torvalds retval->singleton = 1; 12631da177e4SLinus Torvalds retval->end_of_packet = 0; 12641da177e4SLinus Torvalds retval->ecn_ce_done = 0; 12651da177e4SLinus Torvalds retval->pdiscard = 0; 12661da177e4SLinus Torvalds 12671da177e4SLinus Torvalds /* sctpimpguide-05.txt Section 2.8.2 12681da177e4SLinus Torvalds * M1) Each time a new DATA chunk is transmitted 12691da177e4SLinus Torvalds * set the 'TSN.Missing.Report' count for that TSN to 0. The 12701da177e4SLinus Torvalds * 'TSN.Missing.Report' count will be used to determine missing chunks 12711da177e4SLinus Torvalds * and when to fast retransmit. 12721da177e4SLinus Torvalds */ 12731da177e4SLinus Torvalds retval->tsn_missing_report = 0; 12741da177e4SLinus Torvalds retval->tsn_gap_acked = 0; 1275c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 12761da177e4SLinus Torvalds 12771da177e4SLinus Torvalds /* If this is a fragmented message, track all fragments 12781da177e4SLinus Torvalds * of the message (for SEND_FAILED). 12791da177e4SLinus Torvalds */ 12801da177e4SLinus Torvalds retval->msg = NULL; 12811da177e4SLinus Torvalds 12821da177e4SLinus Torvalds /* Polish the bead hole. */ 12831da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 12841da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 12851da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 12861da177e4SLinus Torvalds atomic_set(&retval->refcnt, 1); 12871da177e4SLinus Torvalds 12881da177e4SLinus Torvalds nodata: 12891da177e4SLinus Torvalds return retval; 12901da177e4SLinus Torvalds } 12911da177e4SLinus Torvalds 12921da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 12931da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 12941da177e4SLinus Torvalds union sctp_addr *dest) 12951da177e4SLinus Torvalds { 1296f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 129716b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 12981da177e4SLinus Torvalds } 12991da177e4SLinus Torvalds 13001da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 13011da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 13021da177e4SLinus Torvalds { 13031da177e4SLinus Torvalds /* If we have a known transport, use that. */ 13041da177e4SLinus Torvalds if (chunk->transport) { 13056a1e5f33SAl Viro return &chunk->transport->ipaddr; 13061da177e4SLinus Torvalds } else { 13071da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 13086a1e5f33SAl Viro return &chunk->source; 13091da177e4SLinus Torvalds } 13101da177e4SLinus Torvalds } 13111da177e4SLinus Torvalds 13121da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 13131da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 13141da177e4SLinus Torvalds */ 13151da177e4SLinus Torvalds SCTP_STATIC 13161da177e4SLinus Torvalds struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, 13171da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen) 13181da177e4SLinus Torvalds { 13191da177e4SLinus Torvalds struct sctp_chunk *retval; 13201da177e4SLinus Torvalds sctp_chunkhdr_t *chunk_hdr; 13211da177e4SLinus Torvalds struct sk_buff *skb; 13221da177e4SLinus Torvalds struct sock *sk; 13231da177e4SLinus Torvalds 13241da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 13251da177e4SLinus Torvalds skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), 13261da177e4SLinus Torvalds GFP_ATOMIC); 13271da177e4SLinus Torvalds if (!skb) 13281da177e4SLinus Torvalds goto nodata; 13291da177e4SLinus Torvalds 13301da177e4SLinus Torvalds /* Make room for the chunk header. */ 13311da177e4SLinus Torvalds chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); 13321da177e4SLinus Torvalds chunk_hdr->type = type; 13331da177e4SLinus Torvalds chunk_hdr->flags = flags; 13341da177e4SLinus Torvalds chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); 13351da177e4SLinus Torvalds 13361da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 13371da177e4SLinus Torvalds retval = sctp_chunkify(skb, asoc, sk); 13381da177e4SLinus Torvalds if (!retval) { 13391da177e4SLinus Torvalds kfree_skb(skb); 13401da177e4SLinus Torvalds goto nodata; 13411da177e4SLinus Torvalds } 13421da177e4SLinus Torvalds 13431da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 13441da177e4SLinus Torvalds retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); 13451da177e4SLinus Torvalds 13464cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 13474cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 13484cd57c80SVlad Yasevich retval->auth = 1; 13494cd57c80SVlad Yasevich 13501da177e4SLinus Torvalds /* Set the skb to the belonging sock for accounting. */ 13511da177e4SLinus Torvalds skb->sk = sk; 13521da177e4SLinus Torvalds 13531da177e4SLinus Torvalds return retval; 13541da177e4SLinus Torvalds nodata: 13551da177e4SLinus Torvalds return NULL; 13561da177e4SLinus Torvalds } 13571da177e4SLinus Torvalds 13581da177e4SLinus Torvalds 13591da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 13601da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 13611da177e4SLinus Torvalds { 1362a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1363a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1364a08de64dSVlad Yasevich 13651da177e4SLinus Torvalds /* Free the chunk skb data and the SCTP_chunk stub itself. */ 13661da177e4SLinus Torvalds dev_kfree_skb(chunk->skb); 13671da177e4SLinus Torvalds 13681da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 13691da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 13701da177e4SLinus Torvalds } 13711da177e4SLinus Torvalds 13721da177e4SLinus Torvalds /* Possibly, free the chunk. */ 13731da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 13741da177e4SLinus Torvalds { 13751da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 13761da177e4SLinus Torvalds if (chunk->msg) 13771da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 13781da177e4SLinus Torvalds 13791da177e4SLinus Torvalds sctp_chunk_put(chunk); 13801da177e4SLinus Torvalds } 13811da177e4SLinus Torvalds 13821da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 13831da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 13841da177e4SLinus Torvalds { 13851da177e4SLinus Torvalds atomic_inc(&ch->refcnt); 13861da177e4SLinus Torvalds } 13871da177e4SLinus Torvalds 13881da177e4SLinus Torvalds /* Release a reference to the chunk. */ 13891da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 13901da177e4SLinus Torvalds { 13911da177e4SLinus Torvalds if (atomic_dec_and_test(&ch->refcnt)) 13921da177e4SLinus Torvalds sctp_chunk_destroy(ch); 13931da177e4SLinus Torvalds } 13941da177e4SLinus Torvalds 13951da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 13961da177e4SLinus Torvalds * enough. 13971da177e4SLinus Torvalds */ 13981da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 13991da177e4SLinus Torvalds { 14001da177e4SLinus Torvalds void *target; 14011da177e4SLinus Torvalds void *padding; 14021da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 14038d614adeSWei Yongjun int padlen = WORD_ROUND(chunklen) - chunklen; 14041da177e4SLinus Torvalds 14051da177e4SLinus Torvalds padding = skb_put(chunk->skb, padlen); 14061da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 14071da177e4SLinus Torvalds 14081da177e4SLinus Torvalds memset(padding, 0, padlen); 14091da177e4SLinus Torvalds memcpy(target, data, len); 14101da177e4SLinus Torvalds 14111da177e4SLinus Torvalds /* Adjust the chunk length field. */ 14121da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 141327a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 14141da177e4SLinus Torvalds 14151da177e4SLinus Torvalds return target; 14161da177e4SLinus Torvalds } 14171da177e4SLinus Torvalds 14185fa782c2SNeil Horman /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient 14195fa782c2SNeil Horman * space in the chunk 14205fa782c2SNeil Horman */ 14215fa782c2SNeil Horman void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk, 14225fa782c2SNeil Horman int len, const void *data) 14235fa782c2SNeil Horman { 14245fa782c2SNeil Horman if (skb_tailroom(chunk->skb) > len) 14255fa782c2SNeil Horman return sctp_addto_chunk(chunk, len, data); 14265fa782c2SNeil Horman else 14275fa782c2SNeil Horman return NULL; 14285fa782c2SNeil Horman } 14295fa782c2SNeil Horman 14301da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 14311da177e4SLinus Torvalds * chunk is not big enough. 14321da177e4SLinus Torvalds * Returns a kernel err value. 14331da177e4SLinus Torvalds */ 14341da177e4SLinus Torvalds int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 14351da177e4SLinus Torvalds struct iovec *data) 14361da177e4SLinus Torvalds { 14371da177e4SLinus Torvalds __u8 *target; 14381da177e4SLinus Torvalds int err = 0; 14391da177e4SLinus Torvalds 14401da177e4SLinus Torvalds /* Make room in chunk for data. */ 14411da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 14421da177e4SLinus Torvalds 14431da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 14441da177e4SLinus Torvalds if ((err = memcpy_fromiovecend(target, data, off, len))) 14451da177e4SLinus Torvalds goto out; 14461da177e4SLinus Torvalds 14471da177e4SLinus Torvalds /* Adjust the chunk length field. */ 14481da177e4SLinus Torvalds chunk->chunk_hdr->length = 14491da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 145027a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 14511da177e4SLinus Torvalds 14521da177e4SLinus Torvalds out: 14531da177e4SLinus Torvalds return err; 14541da177e4SLinus Torvalds } 14551da177e4SLinus Torvalds 14561da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 14571da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 14581da177e4SLinus Torvalds */ 14591da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 14601da177e4SLinus Torvalds { 1461ab3e5e7bSVlad Yasevich struct sctp_datamsg *msg; 1462ab3e5e7bSVlad Yasevich struct sctp_chunk *lchunk; 1463ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 14641da177e4SLinus Torvalds __u16 ssn; 14651da177e4SLinus Torvalds __u16 sid; 14661da177e4SLinus Torvalds 14671da177e4SLinus Torvalds if (chunk->has_ssn) 14681da177e4SLinus Torvalds return; 14691da177e4SLinus Torvalds 1470ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1471ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1472ab3e5e7bSVlad Yasevich stream = &chunk->asoc->ssnmap->out; 1473ab3e5e7bSVlad Yasevich 1474ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1475ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1476ab3e5e7bSVlad Yasevich */ 1477ab3e5e7bSVlad Yasevich msg = chunk->msg; 1478ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1479ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 14801da177e4SLinus Torvalds ssn = 0; 14811da177e4SLinus Torvalds } else { 1482ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1483ab3e5e7bSVlad Yasevich ssn = sctp_ssn_next(stream, sid); 14841da177e4SLinus Torvalds else 1485ab3e5e7bSVlad Yasevich ssn = sctp_ssn_peek(stream, sid); 14861da177e4SLinus Torvalds } 14871da177e4SLinus Torvalds 1488ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1489ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1490ab3e5e7bSVlad Yasevich } 14911da177e4SLinus Torvalds } 14921da177e4SLinus Torvalds 14931da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 14941da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 14951da177e4SLinus Torvalds */ 14961da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 14971da177e4SLinus Torvalds { 14981da177e4SLinus Torvalds if (!chunk->has_tsn) { 14991da177e4SLinus Torvalds /* This is the last possible instant to 15001da177e4SLinus Torvalds * assign a TSN. 15011da177e4SLinus Torvalds */ 15021da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 15031da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 15041da177e4SLinus Torvalds chunk->has_tsn = 1; 15051da177e4SLinus Torvalds } 15061da177e4SLinus Torvalds } 15071da177e4SLinus Torvalds 15081da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 15091da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 15103182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1511dd0fc66fSAl Viro gfp_t gfp) 15121da177e4SLinus Torvalds { 15131da177e4SLinus Torvalds struct sctp_association *asoc; 15141da177e4SLinus Torvalds struct sk_buff *skb; 15151da177e4SLinus Torvalds sctp_scope_t scope; 15161da177e4SLinus Torvalds struct sctp_af *af; 15171da177e4SLinus Torvalds 15181da177e4SLinus Torvalds /* Create the bare association. */ 15191da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 15201da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 15211da177e4SLinus Torvalds if (!asoc) 15221da177e4SLinus Torvalds goto nodata; 15231da177e4SLinus Torvalds asoc->temp = 1; 15241da177e4SLinus Torvalds skb = chunk->skb; 15251da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1526eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version)); 15271da177e4SLinus Torvalds if (unlikely(!af)) 15281da177e4SLinus Torvalds goto fail; 1529d55c41b1SAl Viro af->from_skb(&asoc->c.peer_addr, skb, 1); 15301da177e4SLinus Torvalds nodata: 15311da177e4SLinus Torvalds return asoc; 15321da177e4SLinus Torvalds 15331da177e4SLinus Torvalds fail: 15341da177e4SLinus Torvalds sctp_association_free(asoc); 15351da177e4SLinus Torvalds return NULL; 15361da177e4SLinus Torvalds } 15371da177e4SLinus Torvalds 15381da177e4SLinus Torvalds /* Build a cookie representing asoc. 15391da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 15401da177e4SLinus Torvalds */ 15411da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 15421da177e4SLinus Torvalds const struct sctp_association *asoc, 15431da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 15441da177e4SLinus Torvalds int *cookie_len, 15451da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len) 15461da177e4SLinus Torvalds { 15471da177e4SLinus Torvalds sctp_cookie_param_t *retval; 15481da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 15491da177e4SLinus Torvalds struct scatterlist sg; 15501da177e4SLinus Torvalds int headersize, bodysize; 15511da177e4SLinus Torvalds unsigned int keylen; 15521da177e4SLinus Torvalds char *key; 15531da177e4SLinus Torvalds 15549834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 15559834a2bbSVlad Yasevich * any padding. 15569834a2bbSVlad Yasevich */ 15579834a2bbSVlad Yasevich headersize = sizeof(sctp_paramhdr_t) + 15589834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 15599834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 15601da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 15611da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 15621da177e4SLinus Torvalds 15631da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 15641da177e4SLinus Torvalds * functions simpler to write. 15651da177e4SLinus Torvalds */ 15661da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 15671da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 15681da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 15691da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 15701da177e4SLinus Torvalds 15711da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 15721da177e4SLinus Torvalds * out on the network. 15731da177e4SLinus Torvalds */ 1574af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1575af997d8cSArnaldo Carvalho de Melo if (!retval) 1576af997d8cSArnaldo Carvalho de Melo goto nodata; 1577af997d8cSArnaldo Carvalho de Melo 15781da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 15791da177e4SLinus Torvalds 15801da177e4SLinus Torvalds /* Set up the parameter header. */ 15811da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 15821da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 15831da177e4SLinus Torvalds 15841da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 15851da177e4SLinus Torvalds cookie->c = asoc->c; 15861da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 15871da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 15881da177e4SLinus Torvalds 15891da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 15901da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 15911da177e4SLinus Torvalds 15920f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 15930f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 15941da177e4SLinus Torvalds 15951da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 15961da177e4SLinus Torvalds do_gettimeofday(&cookie->c.expiration); 15971da177e4SLinus Torvalds TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration); 15981da177e4SLinus Torvalds 15991da177e4SLinus Torvalds /* Copy the peer's init packet. */ 16001da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 16011da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 16021da177e4SLinus Torvalds 16031da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 16041da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 16051da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 16061da177e4SLinus Torvalds 16071da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 16081b489e11SHerbert Xu struct hash_desc desc; 16091b489e11SHerbert Xu 16101da177e4SLinus Torvalds /* Sign the message. */ 161168e3f5ddSHerbert Xu sg_init_one(&sg, &cookie->c, bodysize); 16121da177e4SLinus Torvalds keylen = SCTP_SECRET_SIZE; 16131da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->current_key]; 16141b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 16151b489e11SHerbert Xu desc.flags = 0; 16161da177e4SLinus Torvalds 16171b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 16181b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, cookie->signature)) 16191b489e11SHerbert Xu goto free_cookie; 16201da177e4SLinus Torvalds } 16211da177e4SLinus Torvalds 16221da177e4SLinus Torvalds return retval; 16231b489e11SHerbert Xu 16241b489e11SHerbert Xu free_cookie: 16251b489e11SHerbert Xu kfree(retval); 16261b489e11SHerbert Xu nodata: 16271b489e11SHerbert Xu *cookie_len = 0; 16281b489e11SHerbert Xu return NULL; 16291da177e4SLinus Torvalds } 16301da177e4SLinus Torvalds 16311da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 16321da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 16331da177e4SLinus Torvalds const struct sctp_endpoint *ep, 16341da177e4SLinus Torvalds const struct sctp_association *asoc, 1635dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 16361da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 16371da177e4SLinus Torvalds { 16381da177e4SLinus Torvalds struct sctp_association *retval = NULL; 16391da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 16401da177e4SLinus Torvalds struct sctp_cookie *bear_cookie; 16411da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1642313e7b4dSVlad Yasevich __u8 *digest = ep->digest; 16431da177e4SLinus Torvalds struct scatterlist sg; 16441da177e4SLinus Torvalds unsigned int keylen, len; 16451da177e4SLinus Torvalds char *key; 16461da177e4SLinus Torvalds sctp_scope_t scope; 16471da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 1648a61bbcf2SPatrick McHardy struct timeval tv; 16491b489e11SHerbert Xu struct hash_desc desc; 16501da177e4SLinus Torvalds 16519834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 16529834a2bbSVlad Yasevich * any padding. 16539834a2bbSVlad Yasevich */ 16549834a2bbSVlad Yasevich headersize = sizeof(sctp_chunkhdr_t) + 16559834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 16569834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 16571da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 16581da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 16591da177e4SLinus Torvalds 16601da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 16611da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 16621da177e4SLinus Torvalds * INIT chunk. 16631da177e4SLinus Torvalds */ 16641da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 16651da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 16661da177e4SLinus Torvalds goto malformed; 16671da177e4SLinus Torvalds 16681da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 16691da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 16701da177e4SLinus Torvalds goto malformed; 16711da177e4SLinus Torvalds 16721da177e4SLinus Torvalds /* Process the cookie. */ 16731da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 16741da177e4SLinus Torvalds bear_cookie = &cookie->c; 16751da177e4SLinus Torvalds 16761da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 16771da177e4SLinus Torvalds goto no_hmac; 16781da177e4SLinus Torvalds 16791da177e4SLinus Torvalds /* Check the signature. */ 16801da177e4SLinus Torvalds keylen = SCTP_SECRET_SIZE; 168168e3f5ddSHerbert Xu sg_init_one(&sg, bear_cookie, bodysize); 16821da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->current_key]; 16831b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 16841b489e11SHerbert Xu desc.flags = 0; 16851da177e4SLinus Torvalds 16868ca84481SAl Viro memset(digest, 0x00, SCTP_SIGNATURE_SIZE); 16871b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 16881b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, digest)) { 16891b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 16901b489e11SHerbert Xu goto fail; 16911b489e11SHerbert Xu } 16921da177e4SLinus Torvalds 16931da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 16941da177e4SLinus Torvalds /* Try the previous key. */ 16951da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->last_key]; 16968ca84481SAl Viro memset(digest, 0x00, SCTP_SIGNATURE_SIZE); 16971b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 16981b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, digest)) { 16991b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17001b489e11SHerbert Xu goto fail; 17011b489e11SHerbert Xu } 17021da177e4SLinus Torvalds 17031da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 17041da177e4SLinus Torvalds /* Yikes! Still bad signature! */ 17051da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 17061da177e4SLinus Torvalds goto fail; 17071da177e4SLinus Torvalds } 17081da177e4SLinus Torvalds } 17091da177e4SLinus Torvalds 17101da177e4SLinus Torvalds no_hmac: 17111da177e4SLinus Torvalds /* IG Section 2.35.2: 17121da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 17131da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 17141da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 17151da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 17161da177e4SLinus Torvalds * discarded, 17171da177e4SLinus Torvalds */ 17181da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 17191da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 17201da177e4SLinus Torvalds goto fail; 17211da177e4SLinus Torvalds } 17221da177e4SLinus Torvalds 17239b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 17241da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 17251da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 17261da177e4SLinus Torvalds goto fail; 17271da177e4SLinus Torvalds } 17281da177e4SLinus Torvalds 17291da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 17301da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 17311da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1732f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1733f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1734f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1735f236218bSVlad Yasevich * down the new association establishment instead of every packet. 17361da177e4SLinus Torvalds */ 1737f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 1738a61bbcf2SPatrick McHardy skb_get_timestamp(skb, &tv); 1739f236218bSVlad Yasevich else 1740f236218bSVlad Yasevich do_gettimeofday(&tv); 1741f236218bSVlad Yasevich 1742a61bbcf2SPatrick McHardy if (!asoc && tv_lt(bear_cookie->expiration, tv)) { 17431da177e4SLinus Torvalds /* 17441da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 17451da177e4SLinus Torvalds * 17461da177e4SLinus Torvalds * Cause of error 17471da177e4SLinus Torvalds * --------------- 17481da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 17491da177e4SLinus Torvalds * Cookie that has expired. 17501da177e4SLinus Torvalds */ 17511da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17521da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 17531da177e4SLinus Torvalds if (*errp) { 1754a61bbcf2SPatrick McHardy suseconds_t usecs = (tv.tv_sec - 17551da177e4SLinus Torvalds bear_cookie->expiration.tv_sec) * 1000000L + 1756a61bbcf2SPatrick McHardy tv.tv_usec - bear_cookie->expiration.tv_usec; 175734bcca28SAl Viro __be32 n = htonl(usecs); 17581da177e4SLinus Torvalds 17591da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, 176000f1c2dfSWei Yongjun sizeof(n)); 176100f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(n), &n); 17621da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 17631da177e4SLinus Torvalds } else 17641da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 17651da177e4SLinus Torvalds 17661da177e4SLinus Torvalds goto fail; 17671da177e4SLinus Torvalds } 17681da177e4SLinus Torvalds 17691da177e4SLinus Torvalds /* Make a new base association. */ 17701da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 17711da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 17721da177e4SLinus Torvalds if (!retval) { 17731da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 17741da177e4SLinus Torvalds goto fail; 17751da177e4SLinus Torvalds } 17761da177e4SLinus Torvalds 17771da177e4SLinus Torvalds /* Set up our peer's port number. */ 17781da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 17791da177e4SLinus Torvalds 17801da177e4SLinus Torvalds /* Populate the association from the cookie. */ 17811da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 17821da177e4SLinus Torvalds 17831da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 17841da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 17851da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 17861da177e4SLinus Torvalds goto fail; 17871da177e4SLinus Torvalds } 17881da177e4SLinus Torvalds 17891da177e4SLinus Torvalds /* Also, add the destination address. */ 17901da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1791f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1792f57d96b2SVlad Yasevich SCTP_ADDR_SRC, GFP_ATOMIC); 17931da177e4SLinus Torvalds } 17941da177e4SLinus Torvalds 17951da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 17961da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 17971da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 17981da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 17991da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 18000f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 18011da177e4SLinus Torvalds 18021da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 18031da177e4SLinus Torvalds return retval; 18041da177e4SLinus Torvalds 18051da177e4SLinus Torvalds fail: 18061da177e4SLinus Torvalds if (retval) 18071da177e4SLinus Torvalds sctp_association_free(retval); 18081da177e4SLinus Torvalds 18091da177e4SLinus Torvalds return NULL; 18101da177e4SLinus Torvalds 18111da177e4SLinus Torvalds malformed: 18121da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 18131da177e4SLinus Torvalds * malformed. 18141da177e4SLinus Torvalds */ 18151da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 18161da177e4SLinus Torvalds goto fail; 18171da177e4SLinus Torvalds } 18181da177e4SLinus Torvalds 18191da177e4SLinus Torvalds /******************************************************************** 18201da177e4SLinus Torvalds * 3rd Level Abstractions 18211da177e4SLinus Torvalds ********************************************************************/ 18221da177e4SLinus Torvalds 18231da177e4SLinus Torvalds struct __sctp_missing { 18249f81bcd9SAl Viro __be32 num_missing; 18259f81bcd9SAl Viro __be16 type; 18261da177e4SLinus Torvalds } __attribute__((packed)); 18271da177e4SLinus Torvalds 18281da177e4SLinus Torvalds /* 18291da177e4SLinus Torvalds * Report a missing mandatory parameter. 18301da177e4SLinus Torvalds */ 18311da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 18321da177e4SLinus Torvalds sctp_param_t paramtype, 18331da177e4SLinus Torvalds struct sctp_chunk *chunk, 18341da177e4SLinus Torvalds struct sctp_chunk **errp) 18351da177e4SLinus Torvalds { 18361da177e4SLinus Torvalds struct __sctp_missing report; 18371da177e4SLinus Torvalds __u16 len; 18381da177e4SLinus Torvalds 18391da177e4SLinus Torvalds len = WORD_ROUND(sizeof(report)); 18401da177e4SLinus Torvalds 18411da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 18421da177e4SLinus Torvalds * returning multiple unknown parameters. 18431da177e4SLinus Torvalds */ 18441da177e4SLinus Torvalds if (!*errp) 18451da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18461da177e4SLinus Torvalds 18471da177e4SLinus Torvalds if (*errp) { 18481da177e4SLinus Torvalds report.num_missing = htonl(1); 18491da177e4SLinus Torvalds report.type = paramtype; 1850ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 185100f1c2dfSWei Yongjun sizeof(report)); 185200f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 18531da177e4SLinus Torvalds } 18541da177e4SLinus Torvalds 18551da177e4SLinus Torvalds /* Stop processing this chunk. */ 18561da177e4SLinus Torvalds return 0; 18571da177e4SLinus Torvalds } 18581da177e4SLinus Torvalds 18591da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 18601da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 18611da177e4SLinus Torvalds struct sctp_chunk *chunk, 18621da177e4SLinus Torvalds struct sctp_chunk **errp) 18631da177e4SLinus Torvalds { 18641da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 18651da177e4SLinus Torvalds 18661da177e4SLinus Torvalds if (!*errp) 18671da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 18681da177e4SLinus Torvalds 18691da177e4SLinus Torvalds if (*errp) 187000f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 18711da177e4SLinus Torvalds 18721da177e4SLinus Torvalds /* Stop processing this chunk. */ 18731da177e4SLinus Torvalds return 0; 18741da177e4SLinus Torvalds } 18751da177e4SLinus Torvalds 18761da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 18771da177e4SLinus Torvalds struct sctp_paramhdr *param, 18781da177e4SLinus Torvalds const struct sctp_chunk *chunk, 18791da177e4SLinus Torvalds struct sctp_chunk **errp) 18801da177e4SLinus Torvalds { 18817ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 18827ab90804SVlad Yasevich * not reported. 18837ab90804SVlad Yasevich */ 18847ab90804SVlad Yasevich if (*errp) 18857ab90804SVlad Yasevich sctp_chunk_free(*errp); 18867ab90804SVlad Yasevich 18871da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1888ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 18891da177e4SLinus Torvalds 18901da177e4SLinus Torvalds return 0; 18911da177e4SLinus Torvalds } 18921da177e4SLinus Torvalds 18931da177e4SLinus Torvalds 18941da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 18951da177e4SLinus Torvalds * send back an indicator to the peer. 18961da177e4SLinus Torvalds */ 18971da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 18981da177e4SLinus Torvalds union sctp_params param, 18991da177e4SLinus Torvalds struct sctp_chunk *chunk, 19001da177e4SLinus Torvalds struct sctp_chunk **errp) 19011da177e4SLinus Torvalds { 19021da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 19031da177e4SLinus Torvalds 19047ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 19057ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 19067ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 19077ab90804SVlad Yasevich * them in the ABORT. 19087ab90804SVlad Yasevich */ 19097ab90804SVlad Yasevich if (*errp) 19107ab90804SVlad Yasevich sctp_chunk_free(*errp); 19117ab90804SVlad Yasevich 19121da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19131da177e4SLinus Torvalds 191400f1c2dfSWei Yongjun if (*errp) { 191500f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); 191600f1c2dfSWei Yongjun sctp_addto_chunk(*errp, len, param.v); 191700f1c2dfSWei Yongjun } 19181da177e4SLinus Torvalds 19191da177e4SLinus Torvalds /* Stop processing this chunk. */ 19201da177e4SLinus Torvalds return 0; 19211da177e4SLinus Torvalds } 19221da177e4SLinus Torvalds 1923d6701191SVlad Yasevich static int sctp_verify_ext_param(union sctp_params param) 1924d6701191SVlad Yasevich { 1925d6701191SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 1926d6701191SVlad Yasevich int have_auth = 0; 1927d6701191SVlad Yasevich int have_asconf = 0; 1928d6701191SVlad Yasevich int i; 1929d6701191SVlad Yasevich 1930d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 1931d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 1932d6701191SVlad Yasevich case SCTP_CID_AUTH: 1933d6701191SVlad Yasevich have_auth = 1; 1934d6701191SVlad Yasevich break; 1935d6701191SVlad Yasevich case SCTP_CID_ASCONF: 1936d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 1937d6701191SVlad Yasevich have_asconf = 1; 1938d6701191SVlad Yasevich break; 1939d6701191SVlad Yasevich } 1940d6701191SVlad Yasevich } 1941d6701191SVlad Yasevich 1942d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 1943d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 1944d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 1945d6701191SVlad Yasevich * mode. 1946d6701191SVlad Yasevich */ 1947d6701191SVlad Yasevich if (sctp_addip_noauth) 1948d6701191SVlad Yasevich return 1; 1949d6701191SVlad Yasevich 1950d6701191SVlad Yasevich if (sctp_addip_enable && !have_auth && have_asconf) 1951d6701191SVlad Yasevich return 0; 1952d6701191SVlad Yasevich 1953d6701191SVlad Yasevich return 1; 1954d6701191SVlad Yasevich } 1955d6701191SVlad Yasevich 1956131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 1957131a47e3SVlad Yasevich union sctp_params param) 1958131a47e3SVlad Yasevich { 1959131a47e3SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 1960131a47e3SVlad Yasevich int i; 1961131a47e3SVlad Yasevich 1962131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 1963131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 1964131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 1965131a47e3SVlad Yasevich if (sctp_prsctp_enable && 1966131a47e3SVlad Yasevich !asoc->peer.prsctp_capable) 1967131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 1968131a47e3SVlad Yasevich break; 1969730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 1970730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 1971730fc3d0SVlad Yasevich * supports AUTH. 1972730fc3d0SVlad Yasevich */ 19730ef46e28SVlad Yasevich if (sctp_auth_enable) 1974730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 1975730fc3d0SVlad Yasevich break; 1976131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 1977131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 19780ef46e28SVlad Yasevich if (sctp_addip_enable) 197988799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 19806b2f9cb6SVlad Yasevich break; 1981131a47e3SVlad Yasevich default: 1982131a47e3SVlad Yasevich break; 1983131a47e3SVlad Yasevich } 1984131a47e3SVlad Yasevich } 1985131a47e3SVlad Yasevich } 1986131a47e3SVlad Yasevich 19871da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 19881da177e4SLinus Torvalds * 19891da177e4SLinus Torvalds * The Parameter Types are encoded such that the 19901da177e4SLinus Torvalds * highest-order two bits specify the action that must be 19911da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 19921da177e4SLinus Torvalds * Parameter Type. 19931da177e4SLinus Torvalds * 19947ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 19957ab90804SVlad Yasevich * parameters within this chunk 19961da177e4SLinus Torvalds * 19977ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 19987ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 19997ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 20001da177e4SLinus Torvalds * 20011da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 20021da177e4SLinus Torvalds * 20031da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 20041da177e4SLinus Torvalds * report the unrecognized parameter in an 20057ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 20061da177e4SLinus Torvalds * 20071da177e4SLinus Torvalds * Return value: 20087ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20097ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 20107ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 20111da177e4SLinus Torvalds */ 20127ab90804SVlad Yasevich static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc, 20131da177e4SLinus Torvalds union sctp_params param, 20141da177e4SLinus Torvalds struct sctp_chunk *chunk, 20151da177e4SLinus Torvalds struct sctp_chunk **errp) 20161da177e4SLinus Torvalds { 20177ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 20181da177e4SLinus Torvalds 20191da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 20201da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 20217ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20221da177e4SLinus Torvalds break; 20231da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 20241da177e4SLinus Torvalds break; 20257ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 20267ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20277ab90804SVlad Yasevich /* Fall through */ 20281da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 20291da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 20301da177e4SLinus Torvalds * returning multiple unknown parameters. 20311da177e4SLinus Torvalds */ 20321da177e4SLinus Torvalds if (NULL == *errp) 20335fa782c2SNeil Horman *errp = sctp_make_op_error_fixed(asoc, chunk); 20341da177e4SLinus Torvalds 20351da177e4SLinus Torvalds if (*errp) { 20365fa782c2SNeil Horman sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM, 20371da177e4SLinus Torvalds WORD_ROUND(ntohs(param.p->length))); 20385fa782c2SNeil Horman sctp_addto_chunk_fixed(*errp, 203900f1c2dfSWei Yongjun WORD_ROUND(ntohs(param.p->length)), 204000f1c2dfSWei Yongjun param.v); 20411da177e4SLinus Torvalds } else { 20421da177e4SLinus Torvalds /* If there is no memory for generating the ERROR 20431da177e4SLinus Torvalds * report as specified, an ABORT will be triggered 20441da177e4SLinus Torvalds * to the peer and the association won't be 20451da177e4SLinus Torvalds * established. 20461da177e4SLinus Torvalds */ 20477ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 20481da177e4SLinus Torvalds } 20491da177e4SLinus Torvalds break; 20501da177e4SLinus Torvalds default: 20511da177e4SLinus Torvalds break; 20521da177e4SLinus Torvalds } 20531da177e4SLinus Torvalds 20541da177e4SLinus Torvalds return retval; 20551da177e4SLinus Torvalds } 20561da177e4SLinus Torvalds 20577ab90804SVlad Yasevich /* Verify variable length parameters 20581da177e4SLinus Torvalds * Return values: 20597ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 20607ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 20617ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 20627ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20631da177e4SLinus Torvalds */ 20647ab90804SVlad Yasevich static sctp_ierror_t sctp_verify_param(const struct sctp_association *asoc, 20651da177e4SLinus Torvalds union sctp_params param, 20661da177e4SLinus Torvalds sctp_cid_t cid, 20671da177e4SLinus Torvalds struct sctp_chunk *chunk, 20681da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 20691da177e4SLinus Torvalds { 207072da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 20717ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 207272da7b38SWei Yongjun __u16 n_elt, id = 0; 207372da7b38SWei Yongjun int i; 20741da177e4SLinus Torvalds 20751da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 20761da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 20771da177e4SLinus Torvalds * identified based on the chunk id. 20781da177e4SLinus Torvalds */ 20791da177e4SLinus Torvalds 20801da177e4SLinus Torvalds switch (param.p->type) { 20811da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 20821da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 20831da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 20841da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 20851da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 20861da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 20871da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 20881da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 20890f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2090d6701191SVlad Yasevich break; 2091d6701191SVlad Yasevich 2092131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2093d6701191SVlad Yasevich if (!sctp_verify_ext_param(param)) 2094d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 20951da177e4SLinus Torvalds break; 20961da177e4SLinus Torvalds 2097d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2098d6de3097SVlad Yasevich if (sctp_addip_enable) 2099d6de3097SVlad Yasevich break; 2100d6de3097SVlad Yasevich goto fallthrough; 2101d6de3097SVlad Yasevich 21021da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 21031da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 21047ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 21057ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21067ab90804SVlad Yasevich break; 2107131a47e3SVlad Yasevich 21081da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 21091da177e4SLinus Torvalds if (sctp_prsctp_enable) 21101da177e4SLinus Torvalds break; 2111730fc3d0SVlad Yasevich goto fallthrough; 2112730fc3d0SVlad Yasevich 2113730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2114730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2115730fc3d0SVlad Yasevich goto fallthrough; 2116730fc3d0SVlad Yasevich 2117730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2118730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2119730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2120730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2121730fc3d0SVlad Yasevich */ 2122730fc3d0SVlad Yasevich if (SCTP_AUTH_RANDOM_LENGTH != 21237ab90804SVlad Yasevich ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) { 21247ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2125730fc3d0SVlad Yasevich chunk, err_chunk); 21267ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21277ab90804SVlad Yasevich } 2128730fc3d0SVlad Yasevich break; 2129730fc3d0SVlad Yasevich 2130730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2131730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2132730fc3d0SVlad Yasevich goto fallthrough; 2133730fc3d0SVlad Yasevich 2134730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2135730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2136730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2137730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2138730fc3d0SVlad Yasevich */ 21397ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 21407ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2141730fc3d0SVlad Yasevich chunk, err_chunk); 21427ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21437ab90804SVlad Yasevich } 2144730fc3d0SVlad Yasevich break; 2145730fc3d0SVlad Yasevich 2146730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 214772da7b38SWei Yongjun if (!sctp_auth_enable) 214872da7b38SWei Yongjun goto fallthrough; 214972da7b38SWei Yongjun 215072da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 215172da7b38SWei Yongjun n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1; 215272da7b38SWei Yongjun 215372da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 215472da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 215572da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 215672da7b38SWei Yongjun */ 215772da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 215872da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 215972da7b38SWei Yongjun 216072da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2161730fc3d0SVlad Yasevich break; 216272da7b38SWei Yongjun } 216372da7b38SWei Yongjun 216472da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 216572da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 216672da7b38SWei Yongjun err_chunk); 216772da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 216872da7b38SWei Yongjun } 216972da7b38SWei Yongjun break; 2170730fc3d0SVlad Yasevich fallthrough: 21711da177e4SLinus Torvalds default: 21721da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n", 21731da177e4SLinus Torvalds ntohs(param.p->type), cid); 21747ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 21751da177e4SLinus Torvalds break; 21761da177e4SLinus Torvalds } 21771da177e4SLinus Torvalds return retval; 21781da177e4SLinus Torvalds } 21791da177e4SLinus Torvalds 21801da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 21811da177e4SLinus Torvalds int sctp_verify_init(const struct sctp_association *asoc, 21821da177e4SLinus Torvalds sctp_cid_t cid, 21831da177e4SLinus Torvalds sctp_init_chunk_t *peer_init, 21841da177e4SLinus Torvalds struct sctp_chunk *chunk, 21851da177e4SLinus Torvalds struct sctp_chunk **errp) 21861da177e4SLinus Torvalds { 21871da177e4SLinus Torvalds union sctp_params param; 21881da177e4SLinus Torvalds int has_cookie = 0; 21897ab90804SVlad Yasevich int result; 21901da177e4SLinus Torvalds 21911da177e4SLinus Torvalds /* Verify stream values are non-zero. */ 21921da177e4SLinus Torvalds if ((0 == peer_init->init_hdr.num_outbound_streams) || 2193d023f629SVlad Yasevich (0 == peer_init->init_hdr.num_inbound_streams) || 2194d023f629SVlad Yasevich (0 == peer_init->init_hdr.init_tag) || 2195d023f629SVlad Yasevich (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) { 21961da177e4SLinus Torvalds 21977ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 21981da177e4SLinus Torvalds } 21991da177e4SLinus Torvalds 22001da177e4SLinus Torvalds /* Check for missing mandatory parameters. */ 22011da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22021da177e4SLinus Torvalds 22031da177e4SLinus Torvalds if (SCTP_PARAM_STATE_COOKIE == param.p->type) 22041da177e4SLinus Torvalds has_cookie = 1; 22051da177e4SLinus Torvalds 22061da177e4SLinus Torvalds } /* for (loop through all parameters) */ 22071da177e4SLinus Torvalds 22081da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 22091da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 22101da177e4SLinus Torvalds * The current param.p would point at the bad one. 22111da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 22121da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 22131da177e4SLinus Torvalds * error handling code build and send the packet. 22141da177e4SLinus Torvalds */ 22157ab90804SVlad Yasevich if (param.v != (void*)chunk->chunk_end) 22167ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 22171da177e4SLinus Torvalds 22181da177e4SLinus Torvalds /* The only missing mandatory param possible today is 22191da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 22201da177e4SLinus Torvalds */ 22217ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 22227ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 22231da177e4SLinus Torvalds chunk, errp); 22241da177e4SLinus Torvalds 22257ab90804SVlad Yasevich /* Verify all the variable length parameters */ 22261da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22271da177e4SLinus Torvalds 22287ab90804SVlad Yasevich result = sctp_verify_param(asoc, param, cid, chunk, errp); 22297ab90804SVlad Yasevich switch (result) { 22307ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 22317ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 22321da177e4SLinus Torvalds return 0; 22337ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 22341da177e4SLinus Torvalds return 1; 22357ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 22367ab90804SVlad Yasevich default: 22377ab90804SVlad Yasevich break; 22381da177e4SLinus Torvalds } 22391da177e4SLinus Torvalds 22401da177e4SLinus Torvalds } /* for (loop through all parameters) */ 22411da177e4SLinus Torvalds 22421da177e4SLinus Torvalds return 1; 22431da177e4SLinus Torvalds } 22441da177e4SLinus Torvalds 22451da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 22461da177e4SLinus Torvalds * Returns 0 on failure, else success. 22471da177e4SLinus Torvalds * FIXME: This is an association method. 22481da177e4SLinus Torvalds */ 22491da177e4SLinus Torvalds int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid, 22501da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2251dd0fc66fSAl Viro sctp_init_chunk_t *peer_init, gfp_t gfp) 22521da177e4SLinus Torvalds { 22531da177e4SLinus Torvalds union sctp_params param; 22541da177e4SLinus Torvalds struct sctp_transport *transport; 22551da177e4SLinus Torvalds struct list_head *pos, *temp; 22561da177e4SLinus Torvalds char *cookie; 22571da177e4SLinus Torvalds 22581da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 22591da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 22601da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 22611da177e4SLinus Torvalds * of the INIT from the cookie. 22621da177e4SLinus Torvalds */ 22631da177e4SLinus Torvalds 22641da177e4SLinus Torvalds /* This implementation defaults to making the first transport 22651da177e4SLinus Torvalds * added as the primary transport. The source address seems to 22661da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 22671da177e4SLinus Torvalds */ 22684bdf4b5fSAl Viro if (peer_addr) { 22696a1e5f33SAl Viro if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 22701da177e4SLinus Torvalds goto nomem; 22714bdf4b5fSAl Viro } 22721da177e4SLinus Torvalds 22731da177e4SLinus Torvalds /* Process the initialization parameters. */ 22741da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22751da177e4SLinus Torvalds 22761da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 22771da177e4SLinus Torvalds goto clean_up; 22781da177e4SLinus Torvalds } 22791da177e4SLinus Torvalds 2280730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2281730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2282730fc3d0SVlad Yasevich */ 2283730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2284730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2285730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2286730fc3d0SVlad Yasevich 2287d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2288d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2289d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2290d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2291d6701191SVlad Yasevich * is what we'll do here. 22926b2f9cb6SVlad Yasevich */ 229373d9c4fdSVlad Yasevich if (!sctp_addip_noauth && 229473d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 22956b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 22966b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 22976b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 229888799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2299d6701191SVlad Yasevich goto clean_up; 23006b2f9cb6SVlad Yasevich } 23016b2f9cb6SVlad Yasevich 23023f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 23033f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 23043f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 23053f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 23063f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 23073f7a87d2SFrank Filz } 23083f7a87d2SFrank Filz } 23093f7a87d2SFrank Filz 23101da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 23111da177e4SLinus Torvalds * order. 23121da177e4SLinus Torvalds */ 23131da177e4SLinus Torvalds asoc->peer.i.init_tag = 23141da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 23151da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 23161da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 23171da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 23181da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 23191da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 23201da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 23211da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 23221da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 23231da177e4SLinus Torvalds 23241da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 23251da177e4SLinus Torvalds * number of inbound streams. 23261da177e4SLinus Torvalds */ 23271da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 23281da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 23291da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 23301da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 23311da177e4SLinus Torvalds } 23321da177e4SLinus Torvalds 23331da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 23341da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 23351da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 23361da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 23371da177e4SLinus Torvalds } 23381da177e4SLinus Torvalds 23391da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 23401da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 23411da177e4SLinus Torvalds 23421da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 23431da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 23441da177e4SLinus Torvalds 23451da177e4SLinus Torvalds /* Copy cookie in case we need to resend COOKIE-ECHO. */ 23461da177e4SLinus Torvalds cookie = asoc->peer.cookie; 23471da177e4SLinus Torvalds if (cookie) { 2348af997d8cSArnaldo Carvalho de Melo asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); 23491da177e4SLinus Torvalds if (!asoc->peer.cookie) 23501da177e4SLinus Torvalds goto clean_up; 23511da177e4SLinus Torvalds } 23521da177e4SLinus Torvalds 23531da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 23541da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 23551da177e4SLinus Torvalds * advertised window). 23561da177e4SLinus Torvalds */ 23579dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 23589dbc15f0SRobert P. J. Day transports) { 23591da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 23601da177e4SLinus Torvalds } 23611da177e4SLinus Torvalds 23621da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 23638e1ee18cSVlad Yasevich if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 23648e1ee18cSVlad Yasevich asoc->peer.i.initial_tsn, gfp)) 23658e1ee18cSVlad Yasevich goto clean_up; 23661da177e4SLinus Torvalds 23671da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 23681da177e4SLinus Torvalds * 23691da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 23701da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 23711da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 23721da177e4SLinus Torvalds * stream sequence number shall be set to 0. 23731da177e4SLinus Torvalds */ 23741da177e4SLinus Torvalds 23753f7a87d2SFrank Filz /* Allocate storage for the negotiated streams if it is not a temporary 23763f7a87d2SFrank Filz * association. 23771da177e4SLinus Torvalds */ 23781da177e4SLinus Torvalds if (!asoc->temp) { 23791da177e4SLinus Torvalds int error; 23801da177e4SLinus Torvalds 23811da177e4SLinus Torvalds asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, 23821da177e4SLinus Torvalds asoc->c.sinit_num_ostreams, gfp); 23831da177e4SLinus Torvalds if (!asoc->ssnmap) 23841da177e4SLinus Torvalds goto clean_up; 23851da177e4SLinus Torvalds 238607d93967SVlad Yasevich error = sctp_assoc_set_id(asoc, gfp); 238707d93967SVlad Yasevich if (error) 23881da177e4SLinus Torvalds goto clean_up; 23891da177e4SLinus Torvalds } 23901da177e4SLinus Torvalds 23911da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 23921da177e4SLinus Torvalds * 23931da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 23941da177e4SLinus Torvalds * remote endpoint it should do the following: 23951da177e4SLinus Torvalds * ... 23961da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 23971da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 23981da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 23991da177e4SLinus Torvalds * association to the same value as the Initial TSN. 24001da177e4SLinus Torvalds */ 24011da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 24021da177e4SLinus Torvalds return 1; 24031da177e4SLinus Torvalds 24041da177e4SLinus Torvalds clean_up: 24051da177e4SLinus Torvalds /* Release the transport structures. */ 24061da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 24071da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2408add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2409add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 24101da177e4SLinus Torvalds } 24113f7a87d2SFrank Filz 24121da177e4SLinus Torvalds nomem: 24131da177e4SLinus Torvalds return 0; 24141da177e4SLinus Torvalds } 24151da177e4SLinus Torvalds 24161da177e4SLinus Torvalds 24171da177e4SLinus Torvalds /* Update asoc with the option described in param. 24181da177e4SLinus Torvalds * 24191da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 24201da177e4SLinus Torvalds * 24211da177e4SLinus Torvalds * asoc is the association to update. 24221da177e4SLinus Torvalds * param is the variable length parameter to use for update. 24231da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 24241da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 24251da177e4SLinus Torvalds * work we do. In particular, we should not build transport 24261da177e4SLinus Torvalds * structures for the addresses. 24271da177e4SLinus Torvalds */ 24281da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 24291da177e4SLinus Torvalds union sctp_params param, 24301da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2431dd0fc66fSAl Viro gfp_t gfp) 24321da177e4SLinus Torvalds { 24331da177e4SLinus Torvalds union sctp_addr addr; 24341da177e4SLinus Torvalds int i; 24351da177e4SLinus Torvalds __u16 sat; 24361da177e4SLinus Torvalds int retval = 1; 24371da177e4SLinus Torvalds sctp_scope_t scope; 24381da177e4SLinus Torvalds time_t stale; 24391da177e4SLinus Torvalds struct sctp_af *af; 2440d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 2441d6de3097SVlad Yasevich struct sctp_transport *t; 24421da177e4SLinus Torvalds 24431da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 24441da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 24451da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 24461da177e4SLinus Torvalds */ 24471da177e4SLinus Torvalds switch (param.p->type) { 24481da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 24491da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 24501da177e4SLinus Torvalds break; 24517dab83deSVlad Yasevich goto do_addr_param; 24527dab83deSVlad Yasevich 24531da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 24547dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 24557dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 24567dab83deSVlad Yasevich break; 24577dab83deSVlad Yasevich do_addr_param: 24581da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2459dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 24601da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2461dd86d136SAl Viro if (sctp_in_scope(&addr, scope)) 2462dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 24631da177e4SLinus Torvalds return 0; 24641da177e4SLinus Torvalds break; 24651da177e4SLinus Torvalds 24661da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 24671da177e4SLinus Torvalds if (!sctp_cookie_preserve_enable) 24681da177e4SLinus Torvalds break; 24691da177e4SLinus Torvalds 24701da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 24711da177e4SLinus Torvalds 24721da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 24731da177e4SLinus Torvalds * (1/1000sec). 24741da177e4SLinus Torvalds */ 24751da177e4SLinus Torvalds asoc->cookie_life.tv_sec += stale / 1000; 24761da177e4SLinus Torvalds asoc->cookie_life.tv_usec += (stale % 1000) * 1000; 24771da177e4SLinus Torvalds break; 24781da177e4SLinus Torvalds 24791da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 24801da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n"); 24811da177e4SLinus Torvalds break; 24821da177e4SLinus Torvalds 24831da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 24841da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 24851da177e4SLinus Torvalds * ones are really set by the peer. 24861da177e4SLinus Torvalds */ 24871da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 24881da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 24891da177e4SLinus Torvalds 2490140ee960SGui Jianfeng /* Assume that peer supports the address family 2491140ee960SGui Jianfeng * by which it sends a packet. 2492140ee960SGui Jianfeng */ 2493140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2494140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2495140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2496140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2497140ee960SGui Jianfeng 24981da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 24991da177e4SLinus Torvalds sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 25001da177e4SLinus Torvalds if (sat) 25011da177e4SLinus Torvalds sat /= sizeof(__u16); 25021da177e4SLinus Torvalds 25031da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 25041da177e4SLinus Torvalds switch (param.sat->types[i]) { 25051da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25061da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 25071da177e4SLinus Torvalds break; 25081da177e4SLinus Torvalds 25091da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25106e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 25111da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 25121da177e4SLinus Torvalds break; 25131da177e4SLinus Torvalds 25141da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 25151da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 25161da177e4SLinus Torvalds break; 25171da177e4SLinus Torvalds 25181da177e4SLinus Torvalds default: /* Just ignore anything else. */ 25191da177e4SLinus Torvalds break; 25203ff50b79SStephen Hemminger } 25211da177e4SLinus Torvalds } 25221da177e4SLinus Torvalds break; 25231da177e4SLinus Torvalds 25241da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 25251da177e4SLinus Torvalds asoc->peer.cookie_len = 25261da177e4SLinus Torvalds ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 25271da177e4SLinus Torvalds asoc->peer.cookie = param.cookie->body; 25281da177e4SLinus Torvalds break; 25291da177e4SLinus Torvalds 25301da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 25311da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 25321da177e4SLinus Torvalds break; 25331da177e4SLinus Torvalds 25341da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 25351da177e4SLinus Torvalds /* Rejected during verify stage. */ 25361da177e4SLinus Torvalds break; 25371da177e4SLinus Torvalds 25381da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 25391da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 25401da177e4SLinus Torvalds break; 25411da177e4SLinus Torvalds 25420f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2543e69c4e0fSVlad Yasevich asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); 25441da177e4SLinus Torvalds break; 25451da177e4SLinus Torvalds 2546d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 25470ef46e28SVlad Yasevich if (!sctp_addip_enable) 25480ef46e28SVlad Yasevich goto fall_through; 25490ef46e28SVlad Yasevich 2550d6de3097SVlad Yasevich addr_param = param.v + sizeof(sctp_addip_param_t); 2551d6de3097SVlad Yasevich 2552d6de3097SVlad Yasevich af = sctp_get_af_specific(param_type2af(param.p->type)); 2553d6de3097SVlad Yasevich af->from_addr_param(&addr, addr_param, 2554d6de3097SVlad Yasevich htons(asoc->peer.port), 0); 2555d6de3097SVlad Yasevich 2556d6de3097SVlad Yasevich /* if the address is invalid, we can't process it. 2557d6de3097SVlad Yasevich * XXX: see spec for what to do. 2558d6de3097SVlad Yasevich */ 2559d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2560d6de3097SVlad Yasevich break; 2561d6de3097SVlad Yasevich 2562d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2563d6de3097SVlad Yasevich if (!t) 2564d6de3097SVlad Yasevich break; 2565d6de3097SVlad Yasevich 2566d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2567d6de3097SVlad Yasevich break; 2568d6de3097SVlad Yasevich 2569131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2570131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2571131a47e3SVlad Yasevich break; 2572131a47e3SVlad Yasevich 25731da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 25741da177e4SLinus Torvalds if (sctp_prsctp_enable) { 25751da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 25761da177e4SLinus Torvalds break; 25771da177e4SLinus Torvalds } 25781da177e4SLinus Torvalds /* Fall Through */ 2579730fc3d0SVlad Yasevich goto fall_through; 2580730fc3d0SVlad Yasevich 2581730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2582730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2583730fc3d0SVlad Yasevich goto fall_through; 2584730fc3d0SVlad Yasevich 2585730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2586730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2587730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2588730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2589730fc3d0SVlad Yasevich retval = 0; 2590730fc3d0SVlad Yasevich break; 2591730fc3d0SVlad Yasevich } 2592730fc3d0SVlad Yasevich break; 2593730fc3d0SVlad Yasevich 2594730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2595730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2596730fc3d0SVlad Yasevich goto fall_through; 2597730fc3d0SVlad Yasevich 2598730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2599730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2600730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2601730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2602730fc3d0SVlad Yasevich retval = 0; 2603730fc3d0SVlad Yasevich break; 2604730fc3d0SVlad Yasevich } 2605730fc3d0SVlad Yasevich 2606730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2607730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2608730fc3d0SVlad Yasevich break; 2609730fc3d0SVlad Yasevich 2610730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2611730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2612730fc3d0SVlad Yasevich goto fall_through; 2613730fc3d0SVlad Yasevich 2614730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2615730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2616730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2617730fc3d0SVlad Yasevich retval = 0; 2618730fc3d0SVlad Yasevich break; 2619730fc3d0SVlad Yasevich fall_through: 26201da177e4SLinus Torvalds default: 26211da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 26221da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 26231da177e4SLinus Torvalds * called prior to this routine. Simply log the error 26241da177e4SLinus Torvalds * here. 26251da177e4SLinus Torvalds */ 26261da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n", 26271da177e4SLinus Torvalds ntohs(param.p->type), asoc); 26281da177e4SLinus Torvalds break; 26293ff50b79SStephen Hemminger } 26301da177e4SLinus Torvalds 26311da177e4SLinus Torvalds return retval; 26321da177e4SLinus Torvalds } 26331da177e4SLinus Torvalds 26341da177e4SLinus Torvalds /* Select a new verification tag. */ 26351da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 26361da177e4SLinus Torvalds { 26371da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 26381da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 26391da177e4SLinus Torvalds */ 26401da177e4SLinus Torvalds __u32 x; 26411da177e4SLinus Torvalds 26421da177e4SLinus Torvalds do { 26431da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 26441da177e4SLinus Torvalds } while (x == 0); 26451da177e4SLinus Torvalds 26461da177e4SLinus Torvalds return x; 26471da177e4SLinus Torvalds } 26481da177e4SLinus Torvalds 26491da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 26501da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 26511da177e4SLinus Torvalds { 26521da177e4SLinus Torvalds __u32 retval; 26531da177e4SLinus Torvalds 26541da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 26551da177e4SLinus Torvalds return retval; 26561da177e4SLinus Torvalds } 26571da177e4SLinus Torvalds 26581da177e4SLinus Torvalds /* 26591da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 26601da177e4SLinus Torvalds * 0 1 2 3 26611da177e4SLinus 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 26621da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26631da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 26641da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26651da177e4SLinus Torvalds * | Serial Number | 26661da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26671da177e4SLinus Torvalds * | Address Parameter | 26681da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26691da177e4SLinus Torvalds * | ASCONF Parameter #1 | 26701da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26711da177e4SLinus Torvalds * \ \ 26721da177e4SLinus Torvalds * / .... / 26731da177e4SLinus Torvalds * \ \ 26741da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26751da177e4SLinus Torvalds * | ASCONF Parameter #N | 26761da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26771da177e4SLinus Torvalds * 26781da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 26791da177e4SLinus Torvalds */ 26801da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 26811da177e4SLinus Torvalds union sctp_addr *addr, 26821da177e4SLinus Torvalds int vparam_len) 26831da177e4SLinus Torvalds { 26841da177e4SLinus Torvalds sctp_addiphdr_t asconf; 26851da177e4SLinus Torvalds struct sctp_chunk *retval; 26861da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 26871da177e4SLinus Torvalds union sctp_addr_param addrparam; 26881da177e4SLinus Torvalds int addrlen; 26891da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 26901da177e4SLinus Torvalds 26911da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 26921da177e4SLinus Torvalds if (!addrlen) 26931da177e4SLinus Torvalds return NULL; 26941da177e4SLinus Torvalds length += addrlen; 26951da177e4SLinus Torvalds 26961da177e4SLinus Torvalds /* Create the chunk. */ 26971da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length); 26981da177e4SLinus Torvalds if (!retval) 26991da177e4SLinus Torvalds return NULL; 27001da177e4SLinus Torvalds 27011da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 27021da177e4SLinus Torvalds 27031da177e4SLinus Torvalds retval->subh.addip_hdr = 27041da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 27051da177e4SLinus Torvalds retval->param_hdr.v = 27061da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 27071da177e4SLinus Torvalds 27081da177e4SLinus Torvalds return retval; 27091da177e4SLinus Torvalds } 27101da177e4SLinus Torvalds 27111da177e4SLinus Torvalds /* ADDIP 27121da177e4SLinus Torvalds * 3.2.1 Add IP Address 27131da177e4SLinus Torvalds * 0 1 2 3 27141da177e4SLinus 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 27151da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27161da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 27171da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27181da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27191da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27201da177e4SLinus Torvalds * | Address Parameter | 27211da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27221da177e4SLinus Torvalds * 27231da177e4SLinus Torvalds * 3.2.2 Delete IP Address 27241da177e4SLinus Torvalds * 0 1 2 3 27251da177e4SLinus 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 27261da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27271da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 27281da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27291da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27301da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27311da177e4SLinus Torvalds * | Address Parameter | 27321da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27331da177e4SLinus Torvalds * 27341da177e4SLinus Torvalds */ 27351da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 27361da177e4SLinus Torvalds union sctp_addr *laddr, 27371da177e4SLinus Torvalds struct sockaddr *addrs, 27381da177e4SLinus Torvalds int addrcnt, 2739dbc16db1SAl Viro __be16 flags) 27401da177e4SLinus Torvalds { 27411da177e4SLinus Torvalds sctp_addip_param_t param; 27421da177e4SLinus Torvalds struct sctp_chunk *retval; 27431da177e4SLinus Torvalds union sctp_addr_param addr_param; 27441da177e4SLinus Torvalds union sctp_addr *addr; 27451da177e4SLinus Torvalds void *addr_buf; 27461da177e4SLinus Torvalds struct sctp_af *af; 27471da177e4SLinus Torvalds int paramlen = sizeof(param); 27481da177e4SLinus Torvalds int addr_param_len = 0; 27491da177e4SLinus Torvalds int totallen = 0; 27501da177e4SLinus Torvalds int i; 27511da177e4SLinus Torvalds 27521da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 27531da177e4SLinus Torvalds addr_buf = addrs; 27541da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 27551da177e4SLinus Torvalds addr = (union sctp_addr *)addr_buf; 27561da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 27571da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 27581da177e4SLinus Torvalds 27591da177e4SLinus Torvalds totallen += paramlen; 27601da177e4SLinus Torvalds totallen += addr_param_len; 27611da177e4SLinus Torvalds 27621da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 27631da177e4SLinus Torvalds } 27641da177e4SLinus Torvalds 27651da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 27661da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 27671da177e4SLinus Torvalds if (!retval) 27681da177e4SLinus Torvalds return NULL; 27691da177e4SLinus Torvalds 27701da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 27711da177e4SLinus Torvalds addr_buf = addrs; 27721da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 27731da177e4SLinus Torvalds addr = (union sctp_addr *)addr_buf; 27741da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 27751da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 27761da177e4SLinus Torvalds param.param_hdr.type = flags; 27771da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 27781da177e4SLinus Torvalds param.crr_id = i; 27791da177e4SLinus Torvalds 27801da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 27811da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 27821da177e4SLinus Torvalds 27831da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 27841da177e4SLinus Torvalds } 27851da177e4SLinus Torvalds return retval; 27861da177e4SLinus Torvalds } 27871da177e4SLinus Torvalds 27881da177e4SLinus Torvalds /* ADDIP 27891da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 27901da177e4SLinus Torvalds * 0 1 2 3 27911da177e4SLinus 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 27921da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27931da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 27941da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27951da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27961da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27971da177e4SLinus Torvalds * | Address Parameter | 27981da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27991da177e4SLinus Torvalds * 28001da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 28011da177e4SLinus Torvalds */ 28021da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 28031da177e4SLinus Torvalds union sctp_addr *addr) 28041da177e4SLinus Torvalds { 28051da177e4SLinus Torvalds sctp_addip_param_t param; 28061da177e4SLinus Torvalds struct sctp_chunk *retval; 28071da177e4SLinus Torvalds int len = sizeof(param); 28081da177e4SLinus Torvalds union sctp_addr_param addrparam; 28091da177e4SLinus Torvalds int addrlen; 28101da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 28111da177e4SLinus Torvalds 28121da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 28131da177e4SLinus Torvalds if (!addrlen) 28141da177e4SLinus Torvalds return NULL; 28151da177e4SLinus Torvalds len += addrlen; 28161da177e4SLinus Torvalds 28171da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 28181da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 28191da177e4SLinus Torvalds if (!retval) 28201da177e4SLinus Torvalds return NULL; 28211da177e4SLinus Torvalds 28221da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 28231da177e4SLinus Torvalds param.param_hdr.length = htons(len); 28241da177e4SLinus Torvalds param.crr_id = 0; 28251da177e4SLinus Torvalds 28261da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 28271da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 28281da177e4SLinus Torvalds 28291da177e4SLinus Torvalds return retval; 28301da177e4SLinus Torvalds } 28311da177e4SLinus Torvalds 28321da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 28331da177e4SLinus Torvalds * 0 1 2 3 28341da177e4SLinus 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 28351da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28361da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 28371da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28381da177e4SLinus Torvalds * | Serial Number | 28391da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28401da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 28411da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28421da177e4SLinus Torvalds * \ \ 28431da177e4SLinus Torvalds * / .... / 28441da177e4SLinus Torvalds * \ \ 28451da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28461da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 28471da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28481da177e4SLinus Torvalds * 28491da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 28501da177e4SLinus Torvalds */ 28511da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 28521da177e4SLinus Torvalds __u32 serial, int vparam_len) 28531da177e4SLinus Torvalds { 28541da177e4SLinus Torvalds sctp_addiphdr_t asconf; 28551da177e4SLinus Torvalds struct sctp_chunk *retval; 28561da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 28571da177e4SLinus Torvalds 28581da177e4SLinus Torvalds /* Create the chunk. */ 28591da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length); 28601da177e4SLinus Torvalds if (!retval) 28611da177e4SLinus Torvalds return NULL; 28621da177e4SLinus Torvalds 28631da177e4SLinus Torvalds asconf.serial = htonl(serial); 28641da177e4SLinus Torvalds 28651da177e4SLinus Torvalds retval->subh.addip_hdr = 28661da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 28671da177e4SLinus Torvalds 28681da177e4SLinus Torvalds return retval; 28691da177e4SLinus Torvalds } 28701da177e4SLinus Torvalds 28711da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 28729f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 2873dbc16db1SAl Viro __be16 err_code, sctp_addip_param_t *asconf_param) 28741da177e4SLinus Torvalds { 28751da177e4SLinus Torvalds sctp_addip_param_t ack_param; 28761da177e4SLinus Torvalds sctp_errhdr_t err_param; 28771da177e4SLinus Torvalds int asconf_param_len = 0; 28781da177e4SLinus Torvalds int err_param_len = 0; 2879dbc16db1SAl Viro __be16 response_type; 28801da177e4SLinus Torvalds 28811da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 28821da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 28831da177e4SLinus Torvalds } else { 28841da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 28851da177e4SLinus Torvalds err_param_len = sizeof(err_param); 28861da177e4SLinus Torvalds if (asconf_param) 28871da177e4SLinus Torvalds asconf_param_len = 28881da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 28891da177e4SLinus Torvalds } 28901da177e4SLinus Torvalds 28911da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 28921da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 28931da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 28941da177e4SLinus Torvalds err_param_len + 28951da177e4SLinus Torvalds asconf_param_len); 28961da177e4SLinus Torvalds ack_param.crr_id = crr_id; 28971da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 28981da177e4SLinus Torvalds 28991da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 29001da177e4SLinus Torvalds return; 29011da177e4SLinus Torvalds 29021da177e4SLinus Torvalds /* Add Error Cause parameter. */ 29031da177e4SLinus Torvalds err_param.cause = err_code; 29041da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 29051da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 29061da177e4SLinus Torvalds 29071da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 29081da177e4SLinus Torvalds if (asconf_param) 29091da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 29101da177e4SLinus Torvalds } 29111da177e4SLinus Torvalds 29121da177e4SLinus Torvalds /* Process a asconf parameter. */ 2913dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 29141da177e4SLinus Torvalds struct sctp_chunk *asconf, 29151da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 29161da177e4SLinus Torvalds { 29171da177e4SLinus Torvalds struct sctp_transport *peer; 29181da177e4SLinus Torvalds struct sctp_af *af; 29191da177e4SLinus Torvalds union sctp_addr addr; 29201da177e4SLinus Torvalds union sctp_addr_param *addr_param; 29211da177e4SLinus Torvalds 2922c1cc678aSPatrick McHardy addr_param = (union sctp_addr_param *) 2923c1cc678aSPatrick McHardy ((void *)asconf_param + sizeof(sctp_addip_param_t)); 2924c1cc678aSPatrick McHardy 292544e65c1eSWei Yongjun if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && 292644e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && 292744e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) 292844e65c1eSWei Yongjun return SCTP_ERROR_UNKNOWN_PARAM; 292944e65c1eSWei Yongjun 2930c4492586SWei Yongjun switch (addr_param->v4.param_hdr.type) { 2931c4492586SWei Yongjun case SCTP_PARAM_IPV6_ADDRESS: 2932c4492586SWei Yongjun if (!asoc->peer.ipv6_address) 2933945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 2934c4492586SWei Yongjun break; 2935c4492586SWei Yongjun case SCTP_PARAM_IPV4_ADDRESS: 2936c4492586SWei Yongjun if (!asoc->peer.ipv4_address) 2937945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 2938c4492586SWei Yongjun break; 2939c4492586SWei Yongjun default: 2940945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 2941c4492586SWei Yongjun } 2942c4492586SWei Yongjun 29431da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type)); 29441da177e4SLinus Torvalds if (unlikely(!af)) 2945945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 29461da177e4SLinus Torvalds 2947dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); 294842e30bf3SVlad Yasevich 294942e30bf3SVlad Yasevich /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast 295042e30bf3SVlad Yasevich * or multicast address. 295142e30bf3SVlad Yasevich * (note: wildcard is permitted and requires special handling so 295242e30bf3SVlad Yasevich * make sure we check for that) 295342e30bf3SVlad Yasevich */ 295442e30bf3SVlad Yasevich if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) 2955945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 295642e30bf3SVlad Yasevich 29571da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 29581da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 295942e30bf3SVlad Yasevich /* Section 4.2.1: 296042e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the source 296142e30bf3SVlad Yasevich * address of the packet MUST be added. 296242e30bf3SVlad Yasevich */ 296342e30bf3SVlad Yasevich if (af->is_any(&addr)) 296442e30bf3SVlad Yasevich memcpy(&addr, &asconf->source, sizeof(addr)); 296542e30bf3SVlad Yasevich 29661da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 29671da177e4SLinus Torvalds * request and does not have the local resources to add this 29681da177e4SLinus Torvalds * new address to the association, it MUST return an Error 29691da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 29701da177e4SLinus Torvalds * Due to Resource Shortage'. 29711da177e4SLinus Torvalds */ 29721da177e4SLinus Torvalds 2973dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 29741da177e4SLinus Torvalds if (!peer) 29751da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 29761da177e4SLinus Torvalds 29771da177e4SLinus Torvalds /* Start the heartbeat timer. */ 29781da177e4SLinus Torvalds if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer))) 29791da177e4SLinus Torvalds sctp_transport_hold(peer); 29801da177e4SLinus Torvalds break; 29811da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 29821da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 29831da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 29841da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 29851da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 29861da177e4SLinus Torvalds */ 298742e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 29881da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 29891da177e4SLinus Torvalds 29901da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 29911da177e4SLinus Torvalds * address which is also the source address of the IP packet 29921da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 29931da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 29941da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 29951da177e4SLinus Torvalds * Delete Source IP Address' 29961da177e4SLinus Torvalds */ 29976a1e5f33SAl Viro if (sctp_cmp_addr_exact(sctp_source(asconf), &addr)) 29981da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 29991da177e4SLinus Torvalds 300042e30bf3SVlad Yasevich /* Section 4.2.2 300142e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 300242e30bf3SVlad Yasevich * addresses of the peer except the source address of the 300342e30bf3SVlad Yasevich * packet MUST be deleted. 300442e30bf3SVlad Yasevich */ 300542e30bf3SVlad Yasevich if (af->is_any(&addr)) { 300642e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 300742e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 300842e30bf3SVlad Yasevich asconf->transport); 300942e30bf3SVlad Yasevich } else 3010dd86d136SAl Viro sctp_assoc_del_peer(asoc, &addr); 30111da177e4SLinus Torvalds break; 30121da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 301342e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 301442e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 301542e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 301642e30bf3SVlad Yasevich * primary. 301742e30bf3SVlad Yasevich */ 301842e30bf3SVlad Yasevich if (af->is_any(&addr)) 301942e30bf3SVlad Yasevich memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); 302042e30bf3SVlad Yasevich 3021dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 30221da177e4SLinus Torvalds if (!peer) 3023945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 30241da177e4SLinus Torvalds 30251da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 30261da177e4SLinus Torvalds break; 30271da177e4SLinus Torvalds } 30281da177e4SLinus Torvalds 30291da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 30301da177e4SLinus Torvalds } 30311da177e4SLinus Torvalds 30326f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 30336f4c618dSWei Yongjun int sctp_verify_asconf(const struct sctp_association *asoc, 30346f4c618dSWei Yongjun struct sctp_paramhdr *param_hdr, void *chunk_end, 30356f4c618dSWei Yongjun struct sctp_paramhdr **errp) { 30366f4c618dSWei Yongjun sctp_addip_param_t *asconf_param; 30376f4c618dSWei Yongjun union sctp_params param; 30386f4c618dSWei Yongjun int length, plen; 30396f4c618dSWei Yongjun 30406f4c618dSWei Yongjun param.v = (sctp_paramhdr_t *) param_hdr; 30416f4c618dSWei Yongjun while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) { 30426f4c618dSWei Yongjun length = ntohs(param.p->length); 30436f4c618dSWei Yongjun *errp = param.p; 30446f4c618dSWei Yongjun 30456f4c618dSWei Yongjun if (param.v > chunk_end - length || 30466f4c618dSWei Yongjun length < sizeof(sctp_paramhdr_t)) 30476f4c618dSWei Yongjun return 0; 30486f4c618dSWei Yongjun 30496f4c618dSWei Yongjun switch (param.p->type) { 30506f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 30516f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 30526f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 30536f4c618dSWei Yongjun asconf_param = (sctp_addip_param_t *)param.v; 30546f4c618dSWei Yongjun plen = ntohs(asconf_param->param_hdr.length); 30556f4c618dSWei Yongjun if (plen < sizeof(sctp_addip_param_t) + 30566f4c618dSWei Yongjun sizeof(sctp_paramhdr_t)) 30576f4c618dSWei Yongjun return 0; 30586f4c618dSWei Yongjun break; 30596f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 30606f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 30616f4c618dSWei Yongjun if (length != sizeof(sctp_addip_param_t)) 30626f4c618dSWei Yongjun return 0; 30636f4c618dSWei Yongjun 30646f4c618dSWei Yongjun break; 30656f4c618dSWei Yongjun default: 30666f4c618dSWei Yongjun break; 30676f4c618dSWei Yongjun } 30686f4c618dSWei Yongjun 30696f4c618dSWei Yongjun param.v += WORD_ROUND(length); 30706f4c618dSWei Yongjun } 30716f4c618dSWei Yongjun 30726f4c618dSWei Yongjun if (param.v != chunk_end) 30736f4c618dSWei Yongjun return 0; 30746f4c618dSWei Yongjun 30756f4c618dSWei Yongjun return 1; 30766f4c618dSWei Yongjun } 30776f4c618dSWei Yongjun 30781da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 30791da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 30801da177e4SLinus Torvalds */ 30811da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 30821da177e4SLinus Torvalds struct sctp_chunk *asconf) 30831da177e4SLinus Torvalds { 30841da177e4SLinus Torvalds sctp_addiphdr_t *hdr; 30851da177e4SLinus Torvalds union sctp_addr_param *addr_param; 30861da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 30871da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 30881da177e4SLinus Torvalds 3089dbc16db1SAl Viro __be16 err_code; 30901da177e4SLinus Torvalds int length = 0; 3091f3830cccSWei Yongjun int chunk_len; 30921da177e4SLinus Torvalds __u32 serial; 30931da177e4SLinus Torvalds int all_param_pass = 1; 30941da177e4SLinus Torvalds 3095f3830cccSWei Yongjun chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t); 30961da177e4SLinus Torvalds hdr = (sctp_addiphdr_t *)asconf->skb->data; 30971da177e4SLinus Torvalds serial = ntohl(hdr->serial); 30981da177e4SLinus Torvalds 30991da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 31001da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 31011da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 31021da177e4SLinus Torvalds chunk_len -= length; 31031da177e4SLinus Torvalds 31041da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 31057aa1b54bSJoe Perches * asconf parameter. 31061da177e4SLinus Torvalds */ 31071da177e4SLinus Torvalds length = ntohs(addr_param->v4.param_hdr.length); 31081da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)addr_param + length); 31091da177e4SLinus Torvalds chunk_len -= length; 31101da177e4SLinus Torvalds 31111da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 31121da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 31131da177e4SLinus Torvalds * ASCONF_ACK parameters are less than or equal to the twice of ASCONF 31147aa1b54bSJoe Perches * parameters. 31151da177e4SLinus Torvalds */ 31161da177e4SLinus Torvalds asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2); 31171da177e4SLinus Torvalds if (!asconf_ack) 31181da177e4SLinus Torvalds goto done; 31191da177e4SLinus Torvalds 31201da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 31211da177e4SLinus Torvalds while (chunk_len > 0) { 31221da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 31231da177e4SLinus Torvalds asconf_param); 31241da177e4SLinus Torvalds /* ADDIP 4.1 A7) 31251da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 31261da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 31271da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 31281da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 31291da177e4SLinus Torvalds * a specific success indication is present for the parameter. 31301da177e4SLinus Torvalds */ 31311da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR != err_code) 31321da177e4SLinus Torvalds all_param_pass = 0; 31331da177e4SLinus Torvalds 31341da177e4SLinus Torvalds if (!all_param_pass) 31351da177e4SLinus Torvalds sctp_add_asconf_response(asconf_ack, 31361da177e4SLinus Torvalds asconf_param->crr_id, err_code, 31371da177e4SLinus Torvalds asconf_param); 31381da177e4SLinus Torvalds 31391da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 31401da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 31411da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 31421da177e4SLinus Torvalds * in the ASCONF. 31431da177e4SLinus Torvalds */ 31441da177e4SLinus Torvalds if (SCTP_ERROR_RSRC_LOW == err_code) 31451da177e4SLinus Torvalds goto done; 31461da177e4SLinus Torvalds 31471da177e4SLinus Torvalds /* Move to the next ASCONF param. */ 31481da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 31491da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)asconf_param + 31501da177e4SLinus Torvalds length); 31511da177e4SLinus Torvalds chunk_len -= length; 31521da177e4SLinus Torvalds } 31531da177e4SLinus Torvalds 31541da177e4SLinus Torvalds done: 31551da177e4SLinus Torvalds asoc->peer.addip_serial++; 31561da177e4SLinus Torvalds 31571da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 31581da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 31591da177e4SLinus Torvalds */ 31601da177e4SLinus Torvalds if (asconf_ack) { 31611da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3162a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3163a08de64dSVlad Yasevich &asoc->asconf_ack_list); 31641da177e4SLinus Torvalds } 31651da177e4SLinus Torvalds 31661da177e4SLinus Torvalds return asconf_ack; 31671da177e4SLinus Torvalds } 31681da177e4SLinus Torvalds 31691da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 3170425e0f68SWei Yongjun static void sctp_asconf_param_success(struct sctp_association *asoc, 31711da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 31721da177e4SLinus Torvalds { 31731da177e4SLinus Torvalds struct sctp_af *af; 31741da177e4SLinus Torvalds union sctp_addr addr; 31751da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 31761da177e4SLinus Torvalds union sctp_addr_param *addr_param; 31771da177e4SLinus Torvalds struct sctp_transport *transport; 3178dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 31791da177e4SLinus Torvalds 31801da177e4SLinus Torvalds addr_param = (union sctp_addr_param *) 31811da177e4SLinus Torvalds ((void *)asconf_param + sizeof(sctp_addip_param_t)); 31821da177e4SLinus Torvalds 31831da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 31841da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type)); 3185dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 31861da177e4SLinus Torvalds 31871da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 31881da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3189559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3190559cf710SVlad Yasevich * held, so the list can not change. 3191559cf710SVlad Yasevich */ 31920ed90fb0SVlad Yasevich local_bh_disable(); 3193559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3194dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3195f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3196dc022a98SSridhar Samudrala } 31970ed90fb0SVlad Yasevich local_bh_enable(); 31983cd9749cSWei Yongjun list_for_each_entry(transport, &asoc->peer.transport_addr_list, 31993cd9749cSWei Yongjun transports) { 32003cd9749cSWei Yongjun if (transport->state == SCTP_ACTIVE) 32013cd9749cSWei Yongjun continue; 32023cd9749cSWei Yongjun dst_release(transport->dst); 32033cd9749cSWei Yongjun sctp_transport_route(transport, NULL, 32043cd9749cSWei Yongjun sctp_sk(asoc->base.sk)); 32053cd9749cSWei Yongjun } 32061da177e4SLinus Torvalds break; 32071da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 32080ed90fb0SVlad Yasevich local_bh_disable(); 3209425e0f68SWei Yongjun sctp_del_bind_addr(bp, &addr); 32100ed90fb0SVlad Yasevich local_bh_enable(); 32119dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 32129dbc15f0SRobert P. J. Day transports) { 3213dc022a98SSridhar Samudrala dst_release(transport->dst); 32141da177e4SLinus Torvalds sctp_transport_route(transport, NULL, 32151da177e4SLinus Torvalds sctp_sk(asoc->base.sk)); 32161da177e4SLinus Torvalds } 32171da177e4SLinus Torvalds break; 32181da177e4SLinus Torvalds default: 32191da177e4SLinus Torvalds break; 32201da177e4SLinus Torvalds } 32211da177e4SLinus Torvalds } 32221da177e4SLinus Torvalds 32231da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 32241da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 32251da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 32261da177e4SLinus Torvalds * ADDIP 4.1 32271da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 32281da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 32291da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 32301da177e4SLinus Torvalds * specific success indication is present for the parameter. 32311da177e4SLinus Torvalds */ 3232dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 32331da177e4SLinus Torvalds sctp_addip_param_t *asconf_param, 32341da177e4SLinus Torvalds int no_err) 32351da177e4SLinus Torvalds { 32361da177e4SLinus Torvalds sctp_addip_param_t *asconf_ack_param; 32371da177e4SLinus Torvalds sctp_errhdr_t *err_param; 32381da177e4SLinus Torvalds int length; 3239f3830cccSWei Yongjun int asconf_ack_len; 3240dbc16db1SAl Viro __be16 err_code; 32411da177e4SLinus Torvalds 32421da177e4SLinus Torvalds if (no_err) 32431da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 32441da177e4SLinus Torvalds else 32451da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 32461da177e4SLinus Torvalds 3247f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3248f3830cccSWei Yongjun sizeof(sctp_chunkhdr_t); 3249f3830cccSWei Yongjun 32501da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 32511da177e4SLinus Torvalds * the first asconf_ack parameter. 32521da177e4SLinus Torvalds */ 32531da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 32541da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + 32551da177e4SLinus Torvalds length); 32561da177e4SLinus Torvalds asconf_ack_len -= length; 32571da177e4SLinus Torvalds 32581da177e4SLinus Torvalds while (asconf_ack_len > 0) { 32591da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 32601da177e4SLinus Torvalds switch(asconf_ack_param->param_hdr.type) { 32611da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 32621da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 32631da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 32641da177e4SLinus Torvalds length = sizeof(sctp_addip_param_t); 32651da177e4SLinus Torvalds err_param = (sctp_errhdr_t *) 32661da177e4SLinus Torvalds ((void *)asconf_ack_param + length); 32671da177e4SLinus Torvalds asconf_ack_len -= length; 32681da177e4SLinus Torvalds if (asconf_ack_len > 0) 32691da177e4SLinus Torvalds return err_param->cause; 32701da177e4SLinus Torvalds else 32711da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 32721da177e4SLinus Torvalds break; 32731da177e4SLinus Torvalds default: 32741da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 32751da177e4SLinus Torvalds } 32761da177e4SLinus Torvalds } 32771da177e4SLinus Torvalds 32781da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 32791da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *) 32801da177e4SLinus Torvalds ((void *)asconf_ack_param + length); 32811da177e4SLinus Torvalds asconf_ack_len -= length; 32821da177e4SLinus Torvalds } 32831da177e4SLinus Torvalds 32841da177e4SLinus Torvalds return err_code; 32851da177e4SLinus Torvalds } 32861da177e4SLinus Torvalds 32871da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 32881da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 32891da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 32901da177e4SLinus Torvalds { 32911da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 32921da177e4SLinus Torvalds union sctp_addr_param *addr_param; 32931da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 32941da177e4SLinus Torvalds int length = 0; 32951da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 32961da177e4SLinus Torvalds int all_param_pass = 0; 32971da177e4SLinus Torvalds int no_err = 1; 32981da177e4SLinus Torvalds int retval = 0; 3299dbc16db1SAl Viro __be16 err_code = SCTP_ERROR_NO_ERROR; 33001da177e4SLinus Torvalds 33011da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 33021da177e4SLinus Torvalds * a pointer to address parameter. 33031da177e4SLinus Torvalds */ 33041da177e4SLinus Torvalds length = sizeof(sctp_addip_chunk_t); 33051da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 33061da177e4SLinus Torvalds asconf_len -= length; 33071da177e4SLinus Torvalds 33081da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 33097aa1b54bSJoe Perches * pointer to the first asconf parameter. 33101da177e4SLinus Torvalds */ 33111da177e4SLinus Torvalds length = ntohs(addr_param->v4.param_hdr.length); 33121da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)addr_param + length); 33131da177e4SLinus Torvalds asconf_len -= length; 33141da177e4SLinus Torvalds 33151da177e4SLinus Torvalds /* ADDIP 4.1 33161da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 33171da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 33181da177e4SLinus Torvalds * successful. 33191da177e4SLinus Torvalds */ 33201da177e4SLinus Torvalds if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) 33211da177e4SLinus Torvalds all_param_pass = 1; 33221da177e4SLinus Torvalds 33231da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 33241da177e4SLinus Torvalds while (asconf_len > 0) { 33251da177e4SLinus Torvalds if (all_param_pass) 33261da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 33271da177e4SLinus Torvalds else { 33281da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 33291da177e4SLinus Torvalds asconf_param, 33301da177e4SLinus Torvalds no_err); 33311da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 33321da177e4SLinus Torvalds no_err = 0; 33331da177e4SLinus Torvalds } 33341da177e4SLinus Torvalds 33351da177e4SLinus Torvalds switch (err_code) { 33361da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 3337425e0f68SWei Yongjun sctp_asconf_param_success(asoc, asconf_param); 33381da177e4SLinus Torvalds break; 33391da177e4SLinus Torvalds 33401da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 33411da177e4SLinus Torvalds retval = 1; 33421da177e4SLinus Torvalds break; 33431da177e4SLinus Torvalds 3344a987f762SWei Yongjun case SCTP_ERROR_UNKNOWN_PARAM: 33451da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 33461da177e4SLinus Torvalds * future. 33471da177e4SLinus Torvalds */ 33481da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 33491da177e4SLinus Torvalds asconf_param->param_hdr.type; 33501da177e4SLinus Torvalds break; 33511da177e4SLinus Torvalds 33521da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 33531da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 33541da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 33551da177e4SLinus Torvalds default: 33561da177e4SLinus Torvalds break; 33571da177e4SLinus Torvalds } 33581da177e4SLinus Torvalds 33591da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 33601da177e4SLinus Torvalds * one. 33611da177e4SLinus Torvalds */ 33621da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 33631da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)asconf_param + 33641da177e4SLinus Torvalds length); 33651da177e4SLinus Torvalds asconf_len -= length; 33661da177e4SLinus Torvalds } 33671da177e4SLinus Torvalds 33681da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 33695f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 33701da177e4SLinus Torvalds sctp_chunk_free(asconf); 33711da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 33721da177e4SLinus Torvalds 33731da177e4SLinus Torvalds return retval; 33741da177e4SLinus Torvalds } 33751da177e4SLinus Torvalds 33761da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 33771da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 33781da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 33791da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 33801da177e4SLinus Torvalds { 33811da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 33821da177e4SLinus Torvalds struct sctp_fwdtsn_chunk *ftsn_chunk; 33831da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 33841da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 33851da177e4SLinus Torvalds size_t hint; 33861da177e4SLinus Torvalds int i; 33871da177e4SLinus Torvalds 33881da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 33891da177e4SLinus Torvalds 33901da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint); 33911da177e4SLinus Torvalds 33921da177e4SLinus Torvalds if (!retval) 33931da177e4SLinus Torvalds return NULL; 33941da177e4SLinus Torvalds 33951da177e4SLinus Torvalds ftsn_chunk = (struct sctp_fwdtsn_chunk *)retval->subh.fwdtsn_hdr; 33961da177e4SLinus Torvalds 33971da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 33981da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 33991da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 34001da177e4SLinus Torvalds 34011da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 34021da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 34031da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 34041da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 34051da177e4SLinus Torvalds } 34061da177e4SLinus Torvalds 34071da177e4SLinus Torvalds return retval; 34081da177e4SLinus Torvalds } 3409