160c778b2SVlad Yasevich /* SCTP kernel implementation 21da177e4SLinus Torvalds * (C) Copyright IBM Corp. 2001, 2004 31da177e4SLinus Torvalds * Copyright (c) 1999-2000 Cisco, Inc. 41da177e4SLinus Torvalds * Copyright (c) 1999-2001 Motorola, Inc. 51da177e4SLinus Torvalds * Copyright (c) 2001-2002 Intel Corp. 61da177e4SLinus Torvalds * 760c778b2SVlad Yasevich * This file is part of the SCTP kernel implementation 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * These functions work with the state functions in sctp_sm_statefuns.c 101da177e4SLinus Torvalds * to implement the state operations. These functions implement the 111da177e4SLinus Torvalds * steps which require modifying existing data structures. 121da177e4SLinus Torvalds * 1360c778b2SVlad Yasevich * This SCTP implementation is free software; 141da177e4SLinus Torvalds * you can redistribute it and/or modify it under the terms of 151da177e4SLinus Torvalds * the GNU General Public License as published by 161da177e4SLinus Torvalds * the Free Software Foundation; either version 2, or (at your option) 171da177e4SLinus Torvalds * any later version. 181da177e4SLinus Torvalds * 1960c778b2SVlad Yasevich * This SCTP implementation is distributed in the hope that it 201da177e4SLinus Torvalds * will be useful, but WITHOUT ANY WARRANTY; without even the implied 211da177e4SLinus Torvalds * ************************ 221da177e4SLinus Torvalds * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 231da177e4SLinus Torvalds * See the GNU General Public License for more details. 241da177e4SLinus Torvalds * 251da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 264b2f13a2SJeff Kirsher * along with GNU CC; see the file COPYING. If not, see 274b2f13a2SJeff Kirsher * <http://www.gnu.org/licenses/>. 281da177e4SLinus Torvalds * 291da177e4SLinus Torvalds * Please send any bug reports or fixes you make to the 301da177e4SLinus Torvalds * email address(es): 3191705c61SDaniel Borkmann * lksctp developers <linux-sctp@vger.kernel.org> 321da177e4SLinus Torvalds * 331da177e4SLinus Torvalds * Written or modified by: 341da177e4SLinus Torvalds * La Monte H.P. Yarroll <piggy@acm.org> 351da177e4SLinus Torvalds * Karl Knutson <karl@athena.chicago.il.us> 361da177e4SLinus Torvalds * C. Robin <chris@hundredacre.ac.uk> 371da177e4SLinus Torvalds * Jon Grimm <jgrimm@us.ibm.com> 381da177e4SLinus Torvalds * Xingang Guo <xingang.guo@intel.com> 391da177e4SLinus Torvalds * Dajiang Zhang <dajiang.zhang@nokia.com> 401da177e4SLinus Torvalds * Sridhar Samudrala <sri@us.ibm.com> 411da177e4SLinus Torvalds * Daisy Chang <daisyc@us.ibm.com> 421da177e4SLinus Torvalds * Ardelle Fan <ardelle.fan@intel.com> 431da177e4SLinus Torvalds * Kevin Gao <kevin.gao@intel.com> 441da177e4SLinus Torvalds */ 451da177e4SLinus Torvalds 46145ce502SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 47145ce502SJoe Perches 485821c769SHerbert Xu #include <crypto/hash.h> 491da177e4SLinus Torvalds #include <linux/types.h> 501da177e4SLinus Torvalds #include <linux/kernel.h> 511da177e4SLinus Torvalds #include <linux/ip.h> 521da177e4SLinus Torvalds #include <linux/ipv6.h> 531da177e4SLinus Torvalds #include <linux/net.h> 541da177e4SLinus Torvalds #include <linux/inet.h> 55ebc3bbcfSChristian Borntraeger #include <linux/scatterlist.h> 565a0e3ad6STejun Heo #include <linux/slab.h> 571da177e4SLinus Torvalds #include <net/sock.h> 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds #include <linux/skbuff.h> 601da177e4SLinus Torvalds #include <linux/random.h> /* for get_random_bytes */ 611da177e4SLinus Torvalds #include <net/sctp/sctp.h> 621da177e4SLinus Torvalds #include <net/sctp/sm.h> 631da177e4SLinus Torvalds 64072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 65cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 66cea8768fSMarcelo Ricardo Leitner gfp_t gfp); 67072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 68cea8768fSMarcelo Ricardo Leitner __u8 flags, int paylen, gfp_t gfp); 69072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 70cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 71cea8768fSMarcelo Ricardo Leitner gfp_t gfp); 721da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 731da177e4SLinus Torvalds const struct sctp_association *asoc, 741da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 751da177e4SLinus Torvalds int *cookie_len, 761da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len); 771da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 781da177e4SLinus Torvalds union sctp_params param, 791da177e4SLinus Torvalds const union sctp_addr *peer_addr, 80dd0fc66fSAl Viro gfp_t gfp); 818ee4be37SVlad Yasevich static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 828ee4be37SVlad Yasevich const void *data); 836daaf0deSstephen hemminger static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len, 846daaf0deSstephen hemminger const void *data); 851da177e4SLinus Torvalds 86072017b4SVlad Yasevich /* Control chunk destructor */ 87072017b4SVlad Yasevich static void sctp_control_release_owner(struct sk_buff *skb) 88072017b4SVlad Yasevich { 89072017b4SVlad Yasevich /*TODO: do memory release */ 90072017b4SVlad Yasevich } 91072017b4SVlad Yasevich 92072017b4SVlad Yasevich static void sctp_control_set_owner_w(struct sctp_chunk *chunk) 93072017b4SVlad Yasevich { 94072017b4SVlad Yasevich struct sctp_association *asoc = chunk->asoc; 95072017b4SVlad Yasevich struct sk_buff *skb = chunk->skb; 96072017b4SVlad Yasevich 97072017b4SVlad Yasevich /* TODO: properly account for control chunks. 98072017b4SVlad Yasevich * To do it right we'll need: 99072017b4SVlad Yasevich * 1) endpoint if association isn't known. 100072017b4SVlad Yasevich * 2) proper memory accounting. 101072017b4SVlad Yasevich * 102072017b4SVlad Yasevich * For now don't do anything for now. 103072017b4SVlad Yasevich */ 104072017b4SVlad Yasevich skb->sk = asoc ? asoc->base.sk : NULL; 105072017b4SVlad Yasevich skb->destructor = sctp_control_release_owner; 106072017b4SVlad Yasevich } 107072017b4SVlad Yasevich 1081da177e4SLinus Torvalds /* What was the inbound interface for this chunk? */ 1091da177e4SLinus Torvalds int sctp_chunk_iif(const struct sctp_chunk *chunk) 1101da177e4SLinus Torvalds { 111e7487c86SMarcelo Ricardo Leitner struct sk_buff *skb = chunk->skb; 1121da177e4SLinus Torvalds 113e7487c86SMarcelo Ricardo Leitner return SCTP_INPUT_CB(skb)->af->skb_iif(skb); 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 1171da177e4SLinus Torvalds * 1181da177e4SLinus Torvalds * Note 2: The ECN capable field is reserved for future use of 1191da177e4SLinus Torvalds * Explicit Congestion Notification. 1201da177e4SLinus Torvalds */ 1211da177e4SLinus Torvalds static const struct sctp_paramhdr ecap_param = { 1221da177e4SLinus Torvalds SCTP_PARAM_ECN_CAPABLE, 12309640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1241da177e4SLinus Torvalds }; 1251da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1261da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 12709640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1281da177e4SLinus Torvalds }; 1291da177e4SLinus Torvalds 1305fa782c2SNeil Horman /* A helper to initialize an op error inside a 1311da177e4SLinus Torvalds * provided chunk, as most cause codes will be embedded inside an 1321da177e4SLinus Torvalds * abort chunk. 1331da177e4SLinus Torvalds */ 1345bf2db03SAl Viro void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, 13500f1c2dfSWei Yongjun size_t paylen) 1361da177e4SLinus Torvalds { 1371da177e4SLinus Torvalds sctp_errhdr_t err; 1381da177e4SLinus Torvalds __u16 len; 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds /* Cause code constants are now defined in network order. */ 1411da177e4SLinus Torvalds err.cause = cause_code; 1421da177e4SLinus Torvalds len = sizeof(sctp_errhdr_t) + paylen; 1431da177e4SLinus Torvalds err.length = htons(len); 1444a1c0107SVlad Yasevich chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds 1475fa782c2SNeil Horman /* A helper to initialize an op error inside a 1485fa782c2SNeil Horman * provided chunk, as most cause codes will be embedded inside an 1495fa782c2SNeil Horman * abort chunk. Differs from sctp_init_cause in that it won't oops 1505fa782c2SNeil Horman * if there isn't enough space in the op error chunk 1515fa782c2SNeil Horman */ 152db28aafaSIoan Orghici static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code, 1535fa782c2SNeil Horman size_t paylen) 1545fa782c2SNeil Horman { 1555fa782c2SNeil Horman sctp_errhdr_t err; 1565fa782c2SNeil Horman __u16 len; 1575fa782c2SNeil Horman 1585fa782c2SNeil Horman /* Cause code constants are now defined in network order. */ 1595fa782c2SNeil Horman err.cause = cause_code; 1605fa782c2SNeil Horman len = sizeof(sctp_errhdr_t) + paylen; 1615fa782c2SNeil Horman err.length = htons(len); 1625fa782c2SNeil Horman 1632e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) < len) 1645fa782c2SNeil Horman return -ENOSPC; 1655fa782c2SNeil Horman chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, 1665fa782c2SNeil Horman sizeof(sctp_errhdr_t), 1675fa782c2SNeil Horman &err); 1685fa782c2SNeil Horman return 0; 1695fa782c2SNeil Horman } 1701da177e4SLinus Torvalds /* 3.3.2 Initiation (INIT) (1) 1711da177e4SLinus Torvalds * 1721da177e4SLinus Torvalds * This chunk is used to initiate a SCTP association between two 1731da177e4SLinus Torvalds * endpoints. The format of the INIT chunk is shown below: 1741da177e4SLinus Torvalds * 1751da177e4SLinus Torvalds * 0 1 2 3 1761da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 1771da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1781da177e4SLinus Torvalds * | Type = 1 | Chunk Flags | Chunk Length | 1791da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1801da177e4SLinus Torvalds * | Initiate Tag | 1811da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1821da177e4SLinus Torvalds * | Advertised Receiver Window Credit (a_rwnd) | 1831da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1841da177e4SLinus Torvalds * | Number of Outbound Streams | Number of Inbound Streams | 1851da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1861da177e4SLinus Torvalds * | Initial TSN | 1871da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1881da177e4SLinus Torvalds * \ \ 1891da177e4SLinus Torvalds * / Optional/Variable-Length Parameters / 1901da177e4SLinus Torvalds * \ \ 1911da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1921da177e4SLinus Torvalds * 1931da177e4SLinus Torvalds * 1941da177e4SLinus Torvalds * The INIT chunk contains the following parameters. Unless otherwise 1951da177e4SLinus Torvalds * noted, each parameter MUST only be included once in the INIT chunk. 1961da177e4SLinus Torvalds * 1971da177e4SLinus Torvalds * Fixed Parameters Status 1981da177e4SLinus Torvalds * ---------------------------------------------- 1991da177e4SLinus Torvalds * Initiate Tag Mandatory 2001da177e4SLinus Torvalds * Advertised Receiver Window Credit Mandatory 2011da177e4SLinus Torvalds * Number of Outbound Streams Mandatory 2021da177e4SLinus Torvalds * Number of Inbound Streams Mandatory 2031da177e4SLinus Torvalds * Initial TSN Mandatory 2041da177e4SLinus Torvalds * 2051da177e4SLinus Torvalds * Variable Parameters Status Type Value 2061da177e4SLinus Torvalds * ------------------------------------------------------------- 2071da177e4SLinus Torvalds * IPv4 Address (Note 1) Optional 5 2081da177e4SLinus Torvalds * IPv6 Address (Note 1) Optional 6 2091da177e4SLinus Torvalds * Cookie Preservative Optional 9 2101da177e4SLinus Torvalds * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) 2111da177e4SLinus Torvalds * Host Name Address (Note 3) Optional 11 2121da177e4SLinus Torvalds * Supported Address Types (Note 4) Optional 12 2131da177e4SLinus Torvalds */ 2141da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, 2151da177e4SLinus Torvalds const struct sctp_bind_addr *bp, 216dd0fc66fSAl Viro gfp_t gfp, int vparam_len) 2171da177e4SLinus Torvalds { 218e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 219b14878ccSVlad Yasevich struct sctp_endpoint *ep = asoc->ep; 2201da177e4SLinus Torvalds sctp_inithdr_t init; 2211da177e4SLinus Torvalds union sctp_params addrs; 2221da177e4SLinus Torvalds size_t chunksize; 2231da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 2241da177e4SLinus Torvalds int num_types, addrs_len = 0; 2251da177e4SLinus Torvalds struct sctp_sock *sp; 2261da177e4SLinus Torvalds sctp_supported_addrs_param_t sat; 2273dbe8656SAl Viro __be16 types[2]; 2280f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 229131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 230131a47e3SVlad Yasevich int num_ext = 0; 231131a47e3SVlad Yasevich __u8 extensions[3]; 232730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 233730fc3d0SVlad Yasevich *auth_hmacs = NULL; 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2361da177e4SLinus Torvalds * 2371da177e4SLinus Torvalds * Note 1: The INIT chunks can contain multiple addresses that 2381da177e4SLinus Torvalds * can be IPv4 and/or IPv6 in any combination. 2391da177e4SLinus Torvalds */ 2401da177e4SLinus Torvalds retval = NULL; 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds /* Convert the provided bind address list to raw format. */ 2431da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds init.init_tag = htonl(asoc->c.my_vtag); 2461da177e4SLinus Torvalds init.a_rwnd = htonl(asoc->rwnd); 2471da177e4SLinus Torvalds init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2481da177e4SLinus Torvalds init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2491da177e4SLinus Torvalds init.initial_tsn = htonl(asoc->c.initial_tsn); 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds /* How many address types are needed? */ 2521da177e4SLinus Torvalds sp = sctp_sk(asoc->base.sk); 2531da177e4SLinus Torvalds num_types = sp->pf->supported_addrs(sp, types); 2541da177e4SLinus Torvalds 255a8170c35SWei Yongjun chunksize = sizeof(init) + addrs_len; 256a8170c35SWei Yongjun chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types)); 2571da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 2588ee4be37SVlad Yasevich 25928aa4c26SXin Long if (asoc->prsctp_enable) 260036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 261036b579bSVlad Yasevich 262131a47e3SVlad Yasevich /* ADDIP: Section 4.2.7: 263131a47e3SVlad Yasevich * An implementation supporting this extension [ADDIP] MUST list 264131a47e3SVlad Yasevich * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and 265131a47e3SVlad Yasevich * INIT-ACK parameters. 266131a47e3SVlad Yasevich */ 267e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) { 268131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 269131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 270131a47e3SVlad Yasevich num_ext += 2; 271131a47e3SVlad Yasevich } 272131a47e3SVlad Yasevich 2736fc791eeSmalc if (sp->adaptation_ind) 2741da177e4SLinus Torvalds chunksize += sizeof(aiparam); 2756fc791eeSmalc 2761da177e4SLinus Torvalds chunksize += vparam_len; 2771da177e4SLinus Torvalds 278730fc3d0SVlad Yasevich /* Account for AUTH related parameters */ 279b14878ccSVlad Yasevich if (ep->auth_enable) { 280730fc3d0SVlad Yasevich /* Add random parameter length*/ 281730fc3d0SVlad Yasevich chunksize += sizeof(asoc->c.auth_random); 282730fc3d0SVlad Yasevich 283730fc3d0SVlad Yasevich /* Add HMACS parameter length if any were defined */ 284730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 285730fc3d0SVlad Yasevich if (auth_hmacs->length) 286a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); 287730fc3d0SVlad Yasevich else 288730fc3d0SVlad Yasevich auth_hmacs = NULL; 289730fc3d0SVlad Yasevich 290730fc3d0SVlad Yasevich /* Add CHUNKS parameter length */ 291730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 292730fc3d0SVlad Yasevich if (auth_chunks->length) 293a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_chunks->length)); 294730fc3d0SVlad Yasevich else 2959baffaa6SVlad Yasevich auth_chunks = NULL; 296730fc3d0SVlad Yasevich 297730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 298730fc3d0SVlad Yasevich num_ext += 1; 299730fc3d0SVlad Yasevich } 300730fc3d0SVlad Yasevich 301131a47e3SVlad Yasevich /* If we have any extensions to report, account for that */ 302131a47e3SVlad Yasevich if (num_ext) 303a8170c35SWei Yongjun chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + 304a8170c35SWei Yongjun num_ext); 305131a47e3SVlad Yasevich 3061da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3071da177e4SLinus Torvalds * 3081da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 3091da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 3101da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 3111da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 3121da177e4SLinus Torvalds * other address types if the Host Name address parameter is 3131da177e4SLinus Torvalds * present in the received INIT chunk. 3141da177e4SLinus Torvalds * 3151da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 3161da177e4SLinus Torvalds */ 3171da177e4SLinus Torvalds 318cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp); 3191da177e4SLinus Torvalds if (!retval) 3201da177e4SLinus Torvalds goto nodata; 3211da177e4SLinus Torvalds 3221da177e4SLinus Torvalds retval->subh.init_hdr = 3231da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 3241da177e4SLinus Torvalds retval->param_hdr.v = 3251da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3281da177e4SLinus Torvalds * 3291da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 3301da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 3311da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 3321da177e4SLinus Torvalds * support any address type. 3331da177e4SLinus Torvalds */ 3341da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 3351da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 3361da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 3371da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 340131a47e3SVlad Yasevich 3417aa1b54bSJoe Perches /* Add the supported extensions parameter. Be nice and add this 342131a47e3SVlad Yasevich * fist before addiding the parameters for the extensions themselves 343131a47e3SVlad Yasevich */ 344131a47e3SVlad Yasevich if (num_ext) { 345131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 346131a47e3SVlad Yasevich ext_param.param_hdr.length = 347131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 348131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 349131a47e3SVlad Yasevich &ext_param); 3508ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 351131a47e3SVlad Yasevich } 352131a47e3SVlad Yasevich 35328aa4c26SXin Long if (asoc->prsctp_enable) 3541da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 355131a47e3SVlad Yasevich 3566fc791eeSmalc if (sp->adaptation_ind) { 3570f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 3581da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3590f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sp->adaptation_ind); 3601da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 3616fc791eeSmalc } 362131a47e3SVlad Yasevich 363730fc3d0SVlad Yasevich /* Add SCTP-AUTH chunks to the parameter list */ 364b14878ccSVlad Yasevich if (ep->auth_enable) { 365730fc3d0SVlad Yasevich sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), 366730fc3d0SVlad Yasevich asoc->c.auth_random); 367730fc3d0SVlad Yasevich if (auth_hmacs) 368730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 369730fc3d0SVlad Yasevich auth_hmacs); 370730fc3d0SVlad Yasevich if (auth_chunks) 371730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 372730fc3d0SVlad Yasevich auth_chunks); 373730fc3d0SVlad Yasevich } 3741da177e4SLinus Torvalds nodata: 3751da177e4SLinus Torvalds kfree(addrs.v); 3761da177e4SLinus Torvalds return retval; 3771da177e4SLinus Torvalds } 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 3801da177e4SLinus Torvalds const struct sctp_chunk *chunk, 381dd0fc66fSAl Viro gfp_t gfp, int unkparam_len) 3821da177e4SLinus Torvalds { 3831da177e4SLinus Torvalds sctp_inithdr_t initack; 3841da177e4SLinus Torvalds struct sctp_chunk *retval; 3851da177e4SLinus Torvalds union sctp_params addrs; 3866fc791eeSmalc struct sctp_sock *sp; 3871da177e4SLinus Torvalds int addrs_len; 3881da177e4SLinus Torvalds sctp_cookie_param_t *cookie; 3891da177e4SLinus Torvalds int cookie_len; 3901da177e4SLinus Torvalds size_t chunksize; 3910f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 392131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 393131a47e3SVlad Yasevich int num_ext = 0; 394131a47e3SVlad Yasevich __u8 extensions[3]; 395730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 396730fc3d0SVlad Yasevich *auth_hmacs = NULL, 397730fc3d0SVlad Yasevich *auth_random = NULL; 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds retval = NULL; 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 4021da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 4051da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 4061da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 4071da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 4081da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 4111da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 4121da177e4SLinus Torvalds */ 4131da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 4141da177e4SLinus Torvalds addrs.v, addrs_len); 4151da177e4SLinus Torvalds if (!cookie) 4161da177e4SLinus Torvalds goto nomem_cookie; 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 4191da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 4201da177e4SLinus Torvalds */ 4216fc791eeSmalc sp = sctp_sk(asoc->base.sk); 4221da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 4251da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4261da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 4271da177e4SLinus Torvalds 4285ffad5acSWei Yongjun if (asoc->peer.prsctp_capable) 429036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 430036b579bSVlad Yasevich 4315ffad5acSWei Yongjun if (asoc->peer.asconf_capable) { 432131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 433131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 434131a47e3SVlad Yasevich num_ext += 2; 435131a47e3SVlad Yasevich } 436131a47e3SVlad Yasevich 4376fc791eeSmalc if (sp->adaptation_ind) 4381da177e4SLinus Torvalds chunksize += sizeof(aiparam); 4391da177e4SLinus Torvalds 440730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 441730fc3d0SVlad Yasevich auth_random = (sctp_paramhdr_t *)asoc->c.auth_random; 442730fc3d0SVlad Yasevich chunksize += ntohs(auth_random->length); 443730fc3d0SVlad Yasevich 444730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 445730fc3d0SVlad Yasevich if (auth_hmacs->length) 446a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); 447730fc3d0SVlad Yasevich else 448730fc3d0SVlad Yasevich auth_hmacs = NULL; 449730fc3d0SVlad Yasevich 450730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 451730fc3d0SVlad Yasevich if (auth_chunks->length) 452a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_chunks->length)); 453730fc3d0SVlad Yasevich else 454730fc3d0SVlad Yasevich auth_chunks = NULL; 455730fc3d0SVlad Yasevich 456730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 457730fc3d0SVlad Yasevich num_ext += 1; 458730fc3d0SVlad Yasevich } 459730fc3d0SVlad Yasevich 4608ee4be37SVlad Yasevich if (num_ext) 461a8170c35SWei Yongjun chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + 462a8170c35SWei Yongjun num_ext); 4638ee4be37SVlad Yasevich 4641da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 465cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp); 4661da177e4SLinus Torvalds if (!retval) 4671da177e4SLinus Torvalds goto nomem_chunk; 4681da177e4SLinus Torvalds 469b99a4d53SDan Carpenter /* RFC 2960 6.4 Multi-homed SCTP Endpoints 470b99a4d53SDan Carpenter * 471b99a4d53SDan Carpenter * An endpoint SHOULD transmit reply chunks (e.g., SACK, 472b99a4d53SDan Carpenter * HEARTBEAT ACK, * etc.) to the same destination transport 473b99a4d53SDan Carpenter * address from which it received the DATA or control chunk 474b99a4d53SDan Carpenter * to which it is replying. 475b99a4d53SDan Carpenter * 476b99a4d53SDan Carpenter * [INIT ACK back to where the INIT came from.] 4771da177e4SLinus Torvalds */ 4781da177e4SLinus Torvalds retval->transport = chunk->transport; 479b99a4d53SDan Carpenter 4801da177e4SLinus Torvalds retval->subh.init_hdr = 4811da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 4821da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 4831da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 4841da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4851da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 486131a47e3SVlad Yasevich if (num_ext) { 487131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 488131a47e3SVlad Yasevich ext_param.param_hdr.length = 489131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 490131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 491131a47e3SVlad Yasevich &ext_param); 4928ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 493131a47e3SVlad Yasevich } 4941da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 4951da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 4961da177e4SLinus Torvalds 4976fc791eeSmalc if (sp->adaptation_ind) { 4980f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 4991da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 5006fc791eeSmalc aiparam.adaptation_ind = htonl(sp->adaptation_ind); 5011da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 5026fc791eeSmalc } 5031da177e4SLinus Torvalds 504730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 505730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_random->length), 506730fc3d0SVlad Yasevich auth_random); 507730fc3d0SVlad Yasevich if (auth_hmacs) 508730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 509730fc3d0SVlad Yasevich auth_hmacs); 510730fc3d0SVlad Yasevich if (auth_chunks) 511730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 512730fc3d0SVlad Yasevich auth_chunks); 513730fc3d0SVlad Yasevich } 514730fc3d0SVlad Yasevich 5151da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 5161da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 5171da177e4SLinus Torvalds 5181da177e4SLinus Torvalds nomem_chunk: 5191da177e4SLinus Torvalds kfree(cookie); 5201da177e4SLinus Torvalds nomem_cookie: 5211da177e4SLinus Torvalds kfree(addrs.v); 5221da177e4SLinus Torvalds return retval; 5231da177e4SLinus Torvalds } 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 5261da177e4SLinus Torvalds * 5271da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 5281da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 5291da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 5301da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 5311da177e4SLinus Torvalds * chunks in the same packet. 5321da177e4SLinus Torvalds * 5331da177e4SLinus Torvalds * 0 1 2 3 5341da177e4SLinus 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 5351da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5361da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 5371da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5381da177e4SLinus Torvalds * / Cookie / 5391da177e4SLinus Torvalds * \ \ 5401da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5411da177e4SLinus Torvalds * 5421da177e4SLinus Torvalds * Chunk Flags: 8 bit 5431da177e4SLinus Torvalds * 5441da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5451da177e4SLinus Torvalds * 5461da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 5471da177e4SLinus Torvalds * 5481da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 5491da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 5501da177e4SLinus Torvalds * 5511da177e4SLinus Torvalds * Cookie: variable size 5521da177e4SLinus Torvalds * 5531da177e4SLinus Torvalds * This field must contain the exact cookie received in the 5541da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 5551da177e4SLinus Torvalds * 5561da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 5571da177e4SLinus Torvalds * to insure interoperability. 5581da177e4SLinus Torvalds */ 5591da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 5601da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5611da177e4SLinus Torvalds { 5621da177e4SLinus Torvalds struct sctp_chunk *retval; 5631da177e4SLinus Torvalds void *cookie; 5641da177e4SLinus Torvalds int cookie_len; 5651da177e4SLinus Torvalds 5661da177e4SLinus Torvalds cookie = asoc->peer.cookie; 5671da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 570cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, 571cea8768fSMarcelo Ricardo Leitner cookie_len, GFP_ATOMIC); 5721da177e4SLinus Torvalds if (!retval) 5731da177e4SLinus Torvalds goto nodata; 5741da177e4SLinus Torvalds retval->subh.cookie_hdr = 5751da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5781da177e4SLinus Torvalds * 5791da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5801da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5811da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5821da177e4SLinus Torvalds * to which it is replying. 5831da177e4SLinus Torvalds * 5841da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 5851da177e4SLinus Torvalds */ 5861da177e4SLinus Torvalds if (chunk) 5871da177e4SLinus Torvalds retval->transport = chunk->transport; 5881da177e4SLinus Torvalds 5891da177e4SLinus Torvalds nodata: 5901da177e4SLinus Torvalds return retval; 5911da177e4SLinus Torvalds } 5921da177e4SLinus Torvalds 5931da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 5941da177e4SLinus Torvalds * 5951da177e4SLinus Torvalds * This chunk is used only during the initialization of an 5961da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 5971da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 5981da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 5991da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 6001da177e4SLinus Torvalds * 6011da177e4SLinus Torvalds * 0 1 2 3 6021da177e4SLinus 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 6031da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6041da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 6051da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6061da177e4SLinus Torvalds * 6071da177e4SLinus Torvalds * Chunk Flags: 8 bits 6081da177e4SLinus Torvalds * 6091da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 6101da177e4SLinus Torvalds */ 6111da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 6121da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6131da177e4SLinus Torvalds { 6141da177e4SLinus Torvalds struct sctp_chunk *retval; 6151da177e4SLinus Torvalds 616cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC); 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6191da177e4SLinus Torvalds * 6201da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6211da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6221da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6231da177e4SLinus Torvalds * to which it is replying. 6241da177e4SLinus Torvalds * 6251da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 6261da177e4SLinus Torvalds */ 6271da177e4SLinus Torvalds if (retval && chunk) 6281da177e4SLinus Torvalds retval->transport = chunk->transport; 6291da177e4SLinus Torvalds 6301da177e4SLinus Torvalds return retval; 6311da177e4SLinus Torvalds } 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds /* 6341da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 6351da177e4SLinus Torvalds * CWR: 6361da177e4SLinus Torvalds * 6371da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 6381da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 6391da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 6401da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 6411da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 6421da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 6431da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 6441da177e4SLinus Torvalds * CE bit. 6451da177e4SLinus Torvalds * 6461da177e4SLinus Torvalds * 0 1 2 3 6471da177e4SLinus 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 6481da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6491da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 6501da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6511da177e4SLinus Torvalds * | Lowest TSN Number | 6521da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6531da177e4SLinus Torvalds * 6541da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 6551da177e4SLinus Torvalds */ 6561da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 6571da177e4SLinus Torvalds const __u32 lowest_tsn, 6581da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6591da177e4SLinus Torvalds { 6601da177e4SLinus Torvalds struct sctp_chunk *retval; 6611da177e4SLinus Torvalds sctp_cwrhdr_t cwr; 6621da177e4SLinus Torvalds 6631da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 664072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, 665cea8768fSMarcelo Ricardo Leitner sizeof(sctp_cwrhdr_t), GFP_ATOMIC); 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds if (!retval) 6681da177e4SLinus Torvalds goto nodata; 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 6711da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6741da177e4SLinus Torvalds * 6751da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6761da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6771da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6781da177e4SLinus Torvalds * to which it is replying. 6791da177e4SLinus Torvalds * 6801da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 6811da177e4SLinus Torvalds * came from.] 6821da177e4SLinus Torvalds */ 6831da177e4SLinus Torvalds if (chunk) 6841da177e4SLinus Torvalds retval->transport = chunk->transport; 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds nodata: 6871da177e4SLinus Torvalds return retval; 6881da177e4SLinus Torvalds } 6891da177e4SLinus Torvalds 6901da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 6911da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 6921da177e4SLinus Torvalds const __u32 lowest_tsn) 6931da177e4SLinus Torvalds { 6941da177e4SLinus Torvalds struct sctp_chunk *retval; 6951da177e4SLinus Torvalds sctp_ecnehdr_t ecne; 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 698072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, 699cea8768fSMarcelo Ricardo Leitner sizeof(sctp_ecnehdr_t), GFP_ATOMIC); 7001da177e4SLinus Torvalds if (!retval) 7011da177e4SLinus Torvalds goto nodata; 7021da177e4SLinus Torvalds retval->subh.ecne_hdr = 7031da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds nodata: 7061da177e4SLinus Torvalds return retval; 7071da177e4SLinus Torvalds } 7081da177e4SLinus Torvalds 709a6c2f792SXin Long static void sctp_set_prsctp_policy(struct sctp_chunk *chunk, 710a6c2f792SXin Long const struct sctp_sndrcvinfo *sinfo) 711a6c2f792SXin Long { 712a6c2f792SXin Long if (!chunk->asoc->prsctp_enable) 713a6c2f792SXin Long return; 714a6c2f792SXin Long 715a6c2f792SXin Long if (SCTP_PR_TTL_ENABLED(sinfo->sinfo_flags)) 716a6c2f792SXin Long chunk->prsctp_param = 717a6c2f792SXin Long jiffies + msecs_to_jiffies(sinfo->sinfo_timetolive); 7188dbdf1f5SXin Long else if (SCTP_PR_RTX_ENABLED(sinfo->sinfo_flags) || 7198dbdf1f5SXin Long SCTP_PR_PRIO_ENABLED(sinfo->sinfo_flags)) 72001aadb3aSXin Long chunk->prsctp_param = sinfo->sinfo_timetolive; 721a6c2f792SXin Long } 722a6c2f792SXin Long 7231da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 7241da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 7251da177e4SLinus Torvalds */ 7261da177e4SLinus Torvalds struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, 7271da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 728cea8768fSMarcelo Ricardo Leitner int data_len, __u8 flags, __u16 ssn, 729cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 7301da177e4SLinus Torvalds { 7311da177e4SLinus Torvalds struct sctp_chunk *retval; 7321da177e4SLinus Torvalds struct sctp_datahdr dp; 7331da177e4SLinus Torvalds int chunk_len; 7341da177e4SLinus Torvalds 7351da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 7361da177e4SLinus Torvalds * creating the chunk. 7371da177e4SLinus Torvalds */ 7381da177e4SLinus Torvalds dp.tsn = 0; 7391da177e4SLinus Torvalds dp.stream = htons(sinfo->sinfo_stream); 7401da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 7411da177e4SLinus Torvalds 7421da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 743eaa5c54dSIvan Skytte Jorgensen if (sinfo->sinfo_flags & SCTP_UNORDERED) { 7441da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 7451da177e4SLinus Torvalds dp.ssn = 0; 7461da177e4SLinus Torvalds } else 7471da177e4SLinus Torvalds dp.ssn = htons(ssn); 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds chunk_len = sizeof(dp) + data_len; 750cea8768fSMarcelo Ricardo Leitner retval = sctp_make_data(asoc, flags, chunk_len, gfp); 7511da177e4SLinus Torvalds if (!retval) 7521da177e4SLinus Torvalds goto nodata; 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 7551da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 756a6c2f792SXin Long sctp_set_prsctp_policy(retval, sinfo); 7571da177e4SLinus Torvalds 7581da177e4SLinus Torvalds nodata: 7591da177e4SLinus Torvalds return retval; 7601da177e4SLinus Torvalds } 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 7631da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 7641da177e4SLinus Torvalds * including duplicates and gaps. 7651da177e4SLinus Torvalds */ 7661da177e4SLinus Torvalds struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) 7671da177e4SLinus Torvalds { 7681da177e4SLinus Torvalds struct sctp_chunk *retval; 7691da177e4SLinus Torvalds struct sctp_sackhdr sack; 7701da177e4SLinus Torvalds int len; 7711da177e4SLinus Torvalds __u32 ctsn; 7721da177e4SLinus Torvalds __u16 num_gabs, num_dup_tsns; 7734244854dSNeil Horman struct sctp_association *aptr = (struct sctp_association *)asoc; 7741da177e4SLinus Torvalds struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 77502015180SVlad Yasevich struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; 7764244854dSNeil Horman struct sctp_transport *trans; 7771da177e4SLinus Torvalds 77802015180SVlad Yasevich memset(gabs, 0, sizeof(gabs)); 7791da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 780bb33381dSDaniel Borkmann 781bb33381dSDaniel Borkmann pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn); 7821da177e4SLinus Torvalds 7831da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 78402015180SVlad Yasevich num_gabs = sctp_tsnmap_num_gabs(map, gabs); 7851da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 7861da177e4SLinus Torvalds 7871da177e4SLinus Torvalds /* Initialize the SACK header. */ 7881da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 7891da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 7901da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 7911da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 7921da177e4SLinus Torvalds 7931da177e4SLinus Torvalds len = sizeof(sack) 7941da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 7951da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 7961da177e4SLinus Torvalds 7971da177e4SLinus Torvalds /* Create the chunk. */ 798cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC); 7991da177e4SLinus Torvalds if (!retval) 8001da177e4SLinus Torvalds goto nodata; 8011da177e4SLinus Torvalds 8021da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8031da177e4SLinus Torvalds * 8041da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8051da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 8061da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 8071da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 8081da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 8091da177e4SLinus Torvalds * reply chunk. 8101da177e4SLinus Torvalds * 8111da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 8121da177e4SLinus Torvalds * in packets from different source addresses in a single 8131da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 8141da177e4SLinus Torvalds * destination transport addresses from which the DATA or 8151da177e4SLinus Torvalds * control chunks being acknowledged were received. 8161da177e4SLinus Torvalds * 8171da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 8181da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 8191da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 8201da177e4SLinus Torvalds * duplicates. --piggy] 8211da177e4SLinus Torvalds * 8221da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 8231da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 8241da177e4SLinus Torvalds * destination address and not use the source address of the 8251da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 8261da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 8271da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 8281da177e4SLinus Torvalds * for the SACK is broken. 8291da177e4SLinus Torvalds * 8301da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 8311da177e4SLinus Torvalds */ 8321da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 8331da177e4SLinus Torvalds 8341da177e4SLinus Torvalds retval->subh.sack_hdr = 8351da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds /* Add the gap ack block information. */ 8381da177e4SLinus Torvalds if (num_gabs) 8391da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 84002015180SVlad Yasevich gabs); 8411da177e4SLinus Torvalds 8421da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 843196d6759SMichele Baldessari if (num_dup_tsns) { 844196d6759SMichele Baldessari aptr->stats.idupchunks += num_dup_tsns; 8451da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 8461da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 847196d6759SMichele Baldessari } 8484244854dSNeil Horman /* Once we have a sack generated, check to see what our sack 8494244854dSNeil Horman * generation is, if its 0, reset the transports to 0, and reset 8504244854dSNeil Horman * the association generation to 1 8514244854dSNeil Horman * 8524244854dSNeil Horman * The idea is that zero is never used as a valid generation for the 8534244854dSNeil Horman * association so no transport will match after a wrap event like this, 8544244854dSNeil Horman * Until the next sack 8554244854dSNeil Horman */ 8564244854dSNeil Horman if (++aptr->peer.sack_generation == 0) { 8574244854dSNeil Horman list_for_each_entry(trans, &asoc->peer.transport_addr_list, 8584244854dSNeil Horman transports) 8594244854dSNeil Horman trans->sack_generation = 0; 8604244854dSNeil Horman aptr->peer.sack_generation = 1; 8614244854dSNeil Horman } 8621da177e4SLinus Torvalds nodata: 8631da177e4SLinus Torvalds return retval; 8641da177e4SLinus Torvalds } 8651da177e4SLinus Torvalds 8661da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 8671da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 8681da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8691da177e4SLinus Torvalds { 8701da177e4SLinus Torvalds struct sctp_chunk *retval; 8711da177e4SLinus Torvalds sctp_shutdownhdr_t shut; 8721da177e4SLinus Torvalds __u32 ctsn; 8731da177e4SLinus Torvalds 8741da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 8751da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 8761da177e4SLinus Torvalds 877072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, 878cea8768fSMarcelo Ricardo Leitner sizeof(sctp_shutdownhdr_t), GFP_ATOMIC); 8791da177e4SLinus Torvalds if (!retval) 8801da177e4SLinus Torvalds goto nodata; 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds retval->subh.shutdown_hdr = 8831da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds if (chunk) 8861da177e4SLinus Torvalds retval->transport = chunk->transport; 8871da177e4SLinus Torvalds nodata: 8881da177e4SLinus Torvalds return retval; 8891da177e4SLinus Torvalds } 8901da177e4SLinus Torvalds 8911da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8921da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8931da177e4SLinus Torvalds { 8941da177e4SLinus Torvalds struct sctp_chunk *retval; 8951da177e4SLinus Torvalds 896cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0, 897cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 8981da177e4SLinus Torvalds 8991da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9001da177e4SLinus Torvalds * 9011da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9021da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9031da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9041da177e4SLinus Torvalds * to which it is replying. 9051da177e4SLinus Torvalds * 9061da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 9071da177e4SLinus Torvalds */ 9081da177e4SLinus Torvalds if (retval && chunk) 9091da177e4SLinus Torvalds retval->transport = chunk->transport; 9101da177e4SLinus Torvalds 9111da177e4SLinus Torvalds return retval; 9121da177e4SLinus Torvalds } 9131da177e4SLinus Torvalds 9141da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 9151da177e4SLinus Torvalds const struct sctp_association *asoc, 9161da177e4SLinus Torvalds const struct sctp_chunk *chunk) 9171da177e4SLinus Torvalds { 9181da177e4SLinus Torvalds struct sctp_chunk *retval; 9191da177e4SLinus Torvalds __u8 flags = 0; 9201da177e4SLinus Torvalds 921047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 922047a2428SJerome Forissier * reflected) 923047a2428SJerome Forissier */ 9241da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 9251da177e4SLinus Torvalds 926cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 927cea8768fSMarcelo Ricardo Leitner 0, GFP_ATOMIC); 9281da177e4SLinus Torvalds 9291da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9301da177e4SLinus Torvalds * 9311da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9321da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9331da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9341da177e4SLinus Torvalds * to which it is replying. 9351da177e4SLinus Torvalds * 9361da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 9371da177e4SLinus Torvalds * came from.] 9381da177e4SLinus Torvalds */ 9391da177e4SLinus Torvalds if (retval && chunk) 9401da177e4SLinus Torvalds retval->transport = chunk->transport; 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds return retval; 9431da177e4SLinus Torvalds } 9441da177e4SLinus Torvalds 9451da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 946047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 9471da177e4SLinus Torvalds */ 9481da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 9491da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9501da177e4SLinus Torvalds const size_t hint) 9511da177e4SLinus Torvalds { 9521da177e4SLinus Torvalds struct sctp_chunk *retval; 9531da177e4SLinus Torvalds __u8 flags = 0; 9541da177e4SLinus Torvalds 955047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 956047a2428SJerome Forissier * an INIT (vtag will be reflected). 957047a2428SJerome Forissier */ 958047a2428SJerome Forissier if (!asoc) { 959047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 960047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 961047a2428SJerome Forissier flags = 0; 962047a2428SJerome Forissier else 963047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 964047a2428SJerome Forissier } 9651da177e4SLinus Torvalds 966cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint, 967cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 9681da177e4SLinus Torvalds 9691da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9701da177e4SLinus Torvalds * 9711da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9721da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9731da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9741da177e4SLinus Torvalds * to which it is replying. 9751da177e4SLinus Torvalds * 9761da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9771da177e4SLinus Torvalds */ 9781da177e4SLinus Torvalds if (retval && chunk) 9791da177e4SLinus Torvalds retval->transport = chunk->transport; 9801da177e4SLinus Torvalds 9811da177e4SLinus Torvalds return retval; 9821da177e4SLinus Torvalds } 9831da177e4SLinus Torvalds 9841da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 9851da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 9861da177e4SLinus Torvalds const struct sctp_association *asoc, 9871da177e4SLinus Torvalds const struct sctp_chunk *chunk, __u32 tsn) 9881da177e4SLinus Torvalds { 9891da177e4SLinus Torvalds struct sctp_chunk *retval; 9909f81bcd9SAl Viro __be32 payload; 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) 9931da177e4SLinus Torvalds + sizeof(tsn)); 9941da177e4SLinus Torvalds 9951da177e4SLinus Torvalds if (!retval) 9961da177e4SLinus Torvalds goto no_mem; 9971da177e4SLinus Torvalds 9981da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 9991da177e4SLinus Torvalds payload = htonl(tsn); 100000f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 100100f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 10021da177e4SLinus Torvalds 10031da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 10041da177e4SLinus Torvalds * 10051da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 10061da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 10071da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 10081da177e4SLinus Torvalds * to which it is replying. 10091da177e4SLinus Torvalds * 10101da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 10111da177e4SLinus Torvalds */ 10121da177e4SLinus Torvalds if (chunk) 10131da177e4SLinus Torvalds retval->transport = chunk->transport; 10141da177e4SLinus Torvalds 10151da177e4SLinus Torvalds no_mem: 10161da177e4SLinus Torvalds return retval; 10171da177e4SLinus Torvalds } 10181da177e4SLinus Torvalds 10191da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 10201da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 10216ce8e9ceSAl Viro struct msghdr *msg, 1022c164a9baSSridhar Samudrala size_t paylen) 10231da177e4SLinus Torvalds { 10241da177e4SLinus Torvalds struct sctp_chunk *retval; 1025c164a9baSSridhar Samudrala void *payload = NULL; 1026c164a9baSSridhar Samudrala int err; 10271da177e4SLinus Torvalds 1028c164a9baSSridhar Samudrala retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); 10291da177e4SLinus Torvalds if (!retval) 10301da177e4SLinus Torvalds goto err_chunk; 10311da177e4SLinus Torvalds 10321da177e4SLinus Torvalds if (paylen) { 10331da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 1034c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 10351da177e4SLinus Torvalds if (!payload) 10361da177e4SLinus Torvalds goto err_payload; 10371da177e4SLinus Torvalds 10386ce8e9ceSAl Viro err = memcpy_from_msg(payload, msg, paylen); 1039c164a9baSSridhar Samudrala if (err < 0) 10401da177e4SLinus Torvalds goto err_copy; 10411da177e4SLinus Torvalds } 10421da177e4SLinus Torvalds 104300f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 104400f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10451da177e4SLinus Torvalds 10461da177e4SLinus Torvalds if (paylen) 10471da177e4SLinus Torvalds kfree(payload); 10481da177e4SLinus Torvalds 10491da177e4SLinus Torvalds return retval; 10501da177e4SLinus Torvalds 10511da177e4SLinus Torvalds err_copy: 10521da177e4SLinus Torvalds kfree(payload); 10531da177e4SLinus Torvalds err_payload: 10541da177e4SLinus Torvalds sctp_chunk_free(retval); 10551da177e4SLinus Torvalds retval = NULL; 10561da177e4SLinus Torvalds err_chunk: 10571da177e4SLinus Torvalds return retval; 10581da177e4SLinus Torvalds } 10591da177e4SLinus Torvalds 10605c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 10615c94bf86SAdrian Bunk * enough. 10625c94bf86SAdrian Bunk */ 10635c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 10645c94bf86SAdrian Bunk const void *data) 10655c94bf86SAdrian Bunk { 10665c94bf86SAdrian Bunk void *target; 10675c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 10685c94bf86SAdrian Bunk 10695c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 10705c94bf86SAdrian Bunk 10716383cfb3SVlad Yasevich if (data) 10725c94bf86SAdrian Bunk memcpy(target, data, len); 10736383cfb3SVlad Yasevich else 10746383cfb3SVlad Yasevich memset(target, 0, len); 10755c94bf86SAdrian Bunk 10765c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 10775c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 10785c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 10795c94bf86SAdrian Bunk 10805c94bf86SAdrian Bunk return target; 10815c94bf86SAdrian Bunk } 10825c94bf86SAdrian Bunk 10831da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 10841da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 10851da177e4SLinus Torvalds const struct sctp_association *asoc, 10861da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10871da177e4SLinus Torvalds const __u8 *payload, 10881da177e4SLinus Torvalds const size_t paylen) 10891da177e4SLinus Torvalds { 10901da177e4SLinus Torvalds struct sctp_chunk *retval; 10911da177e4SLinus Torvalds struct sctp_paramhdr phdr; 10921da177e4SLinus Torvalds 10931da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen 109400f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10951da177e4SLinus Torvalds if (!retval) 10961da177e4SLinus Torvalds goto end; 10971da177e4SLinus Torvalds 109800f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen 109900f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 11021da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 110300f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 110400f1c2dfSWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr); 11051da177e4SLinus Torvalds 11061da177e4SLinus Torvalds end: 11071da177e4SLinus Torvalds return retval; 11081da177e4SLinus Torvalds } 11091da177e4SLinus Torvalds 1110ba016670SWei Yongjun struct sctp_chunk *sctp_make_violation_paramlen( 1111ba016670SWei Yongjun const struct sctp_association *asoc, 1112ba016670SWei Yongjun const struct sctp_chunk *chunk, 1113ba016670SWei Yongjun struct sctp_paramhdr *param) 1114ba016670SWei Yongjun { 1115ba016670SWei Yongjun struct sctp_chunk *retval; 1116ba016670SWei Yongjun static const char error[] = "The following parameter had invalid length:"; 1117ba016670SWei Yongjun size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) + 1118ba016670SWei Yongjun sizeof(sctp_paramhdr_t); 1119ba016670SWei Yongjun 1120ba016670SWei Yongjun retval = sctp_make_abort(asoc, chunk, payload_len); 1121ba016670SWei Yongjun if (!retval) 1122ba016670SWei Yongjun goto nodata; 1123ba016670SWei Yongjun 1124ba016670SWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, 1125ba016670SWei Yongjun sizeof(error) + sizeof(sctp_paramhdr_t)); 1126ba016670SWei Yongjun sctp_addto_chunk(retval, sizeof(error), error); 1127ba016670SWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param); 1128ba016670SWei Yongjun 1129ba016670SWei Yongjun nodata: 1130ba016670SWei Yongjun return retval; 1131ba016670SWei Yongjun } 1132ba016670SWei Yongjun 1133de4594a5SNeil Horman struct sctp_chunk *sctp_make_violation_max_retrans( 1134de4594a5SNeil Horman const struct sctp_association *asoc, 1135de4594a5SNeil Horman const struct sctp_chunk *chunk) 1136de4594a5SNeil Horman { 1137de4594a5SNeil Horman struct sctp_chunk *retval; 1138de4594a5SNeil Horman static const char error[] = "Association exceeded its max_retans count"; 1139de4594a5SNeil Horman size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t); 1140de4594a5SNeil Horman 1141de4594a5SNeil Horman retval = sctp_make_abort(asoc, chunk, payload_len); 1142de4594a5SNeil Horman if (!retval) 1143de4594a5SNeil Horman goto nodata; 1144de4594a5SNeil Horman 1145de4594a5SNeil Horman sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); 1146de4594a5SNeil Horman sctp_addto_chunk(retval, sizeof(error), error); 1147de4594a5SNeil Horman 1148de4594a5SNeil Horman nodata: 1149de4594a5SNeil Horman return retval; 1150de4594a5SNeil Horman } 1151de4594a5SNeil Horman 11521da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 11531da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 115492c73af5SWei Yongjun const struct sctp_transport *transport) 11551da177e4SLinus Torvalds { 115692c73af5SWei Yongjun struct sctp_chunk *retval; 115792c73af5SWei Yongjun sctp_sender_hb_info_t hbinfo; 115892c73af5SWei Yongjun 1159cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, 1160cea8768fSMarcelo Ricardo Leitner sizeof(hbinfo), GFP_ATOMIC); 11611da177e4SLinus Torvalds 11621da177e4SLinus Torvalds if (!retval) 11631da177e4SLinus Torvalds goto nodata; 11641da177e4SLinus Torvalds 116592c73af5SWei Yongjun hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; 116692c73af5SWei Yongjun hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t)); 116792c73af5SWei Yongjun hbinfo.daddr = transport->ipaddr; 116892c73af5SWei Yongjun hbinfo.sent_at = jiffies; 116992c73af5SWei Yongjun hbinfo.hb_nonce = transport->hb_nonce; 117092c73af5SWei Yongjun 11711da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 11721da177e4SLinus Torvalds * what transport it belongs to. 11731da177e4SLinus Torvalds */ 11741da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 117592c73af5SWei Yongjun retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), 117692c73af5SWei Yongjun &hbinfo); 11771da177e4SLinus Torvalds 11781da177e4SLinus Torvalds nodata: 11791da177e4SLinus Torvalds return retval; 11801da177e4SLinus Torvalds } 11811da177e4SLinus Torvalds 11821da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 11831da177e4SLinus Torvalds const struct sctp_chunk *chunk, 11841da177e4SLinus Torvalds const void *payload, const size_t paylen) 11851da177e4SLinus Torvalds { 11861da177e4SLinus Torvalds struct sctp_chunk *retval; 11871da177e4SLinus Torvalds 1188cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen, 1189cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 11901da177e4SLinus Torvalds if (!retval) 11911da177e4SLinus Torvalds goto nodata; 11921da177e4SLinus Torvalds 11931da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 11941da177e4SLinus Torvalds 11951da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11961da177e4SLinus Torvalds * 11971da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11981da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 11991da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 12001da177e4SLinus Torvalds * to which it is replying. 12011da177e4SLinus Torvalds * 12021da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 12031da177e4SLinus Torvalds */ 12041da177e4SLinus Torvalds if (chunk) 12051da177e4SLinus Torvalds retval->transport = chunk->transport; 12061da177e4SLinus Torvalds 12071da177e4SLinus Torvalds nodata: 12081da177e4SLinus Torvalds return retval; 12091da177e4SLinus Torvalds } 12101da177e4SLinus Torvalds 12111da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 12121da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 12131da177e4SLinus Torvalds */ 12141da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 12151da177e4SLinus Torvalds const struct sctp_association *asoc, 12161da177e4SLinus Torvalds const struct sctp_chunk *chunk, 12171da177e4SLinus Torvalds size_t size) 12181da177e4SLinus Torvalds { 12191da177e4SLinus Torvalds struct sctp_chunk *retval; 12201da177e4SLinus Torvalds 1221072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, 1222cea8768fSMarcelo Ricardo Leitner sizeof(sctp_errhdr_t) + size, GFP_ATOMIC); 12231da177e4SLinus Torvalds if (!retval) 12241da177e4SLinus Torvalds goto nodata; 12251da177e4SLinus Torvalds 12261da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 12271da177e4SLinus Torvalds * 12281da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 12291da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 12301da177e4SLinus Torvalds * address from which it received the DATA or control chunk 12311da177e4SLinus Torvalds * to which it is replying. 12321da177e4SLinus Torvalds * 12331da177e4SLinus Torvalds */ 12341da177e4SLinus Torvalds if (chunk) 12351da177e4SLinus Torvalds retval->transport = chunk->transport; 12361da177e4SLinus Torvalds 12371da177e4SLinus Torvalds nodata: 12381da177e4SLinus Torvalds return retval; 12391da177e4SLinus Torvalds } 12401da177e4SLinus Torvalds 12415fa782c2SNeil Horman /* Create an Operation Error chunk of a fixed size, 12425fa782c2SNeil Horman * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) 12435fa782c2SNeil Horman * This is a helper function to allocate an error chunk for 12445fa782c2SNeil Horman * for those invalid parameter codes in which we may not want 1245d82603c6SJorrit Schippers * to report all the errors, if the incoming chunk is large 12465fa782c2SNeil Horman */ 12475fa782c2SNeil Horman static inline struct sctp_chunk *sctp_make_op_error_fixed( 12485fa782c2SNeil Horman const struct sctp_association *asoc, 12495fa782c2SNeil Horman const struct sctp_chunk *chunk) 12505fa782c2SNeil Horman { 12515fa782c2SNeil Horman size_t size = asoc ? asoc->pathmtu : 0; 12525fa782c2SNeil Horman 12535fa782c2SNeil Horman if (!size) 12545fa782c2SNeil Horman size = SCTP_DEFAULT_MAXSEGMENT; 12555fa782c2SNeil Horman 12565fa782c2SNeil Horman return sctp_make_op_error_space(asoc, chunk, size); 12575fa782c2SNeil Horman } 12585fa782c2SNeil Horman 12591da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 12601da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 12611da177e4SLinus Torvalds const struct sctp_chunk *chunk, 126263706c5cSAl Viro __be16 cause_code, const void *payload, 12636383cfb3SVlad Yasevich size_t paylen, size_t reserve_tail) 12641da177e4SLinus Torvalds { 12651da177e4SLinus Torvalds struct sctp_chunk *retval; 12661da177e4SLinus Torvalds 12676383cfb3SVlad Yasevich retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); 12681da177e4SLinus Torvalds if (!retval) 12691da177e4SLinus Torvalds goto nodata; 12701da177e4SLinus Torvalds 12716383cfb3SVlad Yasevich sctp_init_cause(retval, cause_code, paylen + reserve_tail); 127200f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 12736383cfb3SVlad Yasevich if (reserve_tail) 12746383cfb3SVlad Yasevich sctp_addto_param(retval, reserve_tail, NULL); 12751da177e4SLinus Torvalds 12761da177e4SLinus Torvalds nodata: 12771da177e4SLinus Torvalds return retval; 12781da177e4SLinus Torvalds } 12791da177e4SLinus Torvalds 12804cd57c80SVlad Yasevich struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) 12814cd57c80SVlad Yasevich { 12824cd57c80SVlad Yasevich struct sctp_chunk *retval; 12834cd57c80SVlad Yasevich struct sctp_hmac *hmac_desc; 12844cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 12854cd57c80SVlad Yasevich __u8 *hmac; 12864cd57c80SVlad Yasevich 12874cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 12884cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 12894cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 12904cd57c80SVlad Yasevich return NULL; 12914cd57c80SVlad Yasevich 1292072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, 1293cea8768fSMarcelo Ricardo Leitner hmac_desc->hmac_len + sizeof(sctp_authhdr_t), 1294cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 12954cd57c80SVlad Yasevich if (!retval) 12964cd57c80SVlad Yasevich return NULL; 12974cd57c80SVlad Yasevich 12984cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 12994cd57c80SVlad Yasevich auth_hdr.shkey_id = htons(asoc->active_key_id); 13004cd57c80SVlad Yasevich 13014cd57c80SVlad Yasevich retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t), 13024cd57c80SVlad Yasevich &auth_hdr); 13034cd57c80SVlad Yasevich 13044cd57c80SVlad Yasevich hmac = skb_put(retval->skb, hmac_desc->hmac_len); 13054cd57c80SVlad Yasevich memset(hmac, 0, hmac_desc->hmac_len); 13064cd57c80SVlad Yasevich 13074cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 13084cd57c80SVlad Yasevich retval->chunk_hdr->length = 13094cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 13104cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 13114cd57c80SVlad Yasevich 13124cd57c80SVlad Yasevich return retval; 13134cd57c80SVlad Yasevich } 13144cd57c80SVlad Yasevich 13154cd57c80SVlad Yasevich 13161da177e4SLinus Torvalds /******************************************************************** 13171da177e4SLinus Torvalds * 2nd Level Abstractions 13181da177e4SLinus Torvalds ********************************************************************/ 13191da177e4SLinus Torvalds 13201da177e4SLinus Torvalds /* Turn an skb into a chunk. 13211da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 13223dc0a548Swangweidong * 13233dc0a548Swangweidong * sctpimpguide-05.txt Section 2.8.2 13243dc0a548Swangweidong * M1) Each time a new DATA chunk is transmitted 13253dc0a548Swangweidong * set the 'TSN.Missing.Report' count for that TSN to 0. The 13263dc0a548Swangweidong * 'TSN.Missing.Report' count will be used to determine missing chunks 13273dc0a548Swangweidong * and when to fast retransmit. 13283dc0a548Swangweidong * 13291da177e4SLinus Torvalds */ 13301da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 13311da177e4SLinus Torvalds const struct sctp_association *asoc, 1332cea8768fSMarcelo Ricardo Leitner struct sock *sk, gfp_t gfp) 13331da177e4SLinus Torvalds { 13341da177e4SLinus Torvalds struct sctp_chunk *retval; 13351da177e4SLinus Torvalds 1336cea8768fSMarcelo Ricardo Leitner retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp); 13371da177e4SLinus Torvalds 13381da177e4SLinus Torvalds if (!retval) 13391da177e4SLinus Torvalds goto nodata; 1340bb33381dSDaniel Borkmann if (!sk) 1341bb33381dSDaniel Borkmann pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); 13421da177e4SLinus Torvalds 134379af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 13441da177e4SLinus Torvalds retval->skb = skb; 13451da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 13461da177e4SLinus Torvalds retval->singleton = 1; 13471da177e4SLinus Torvalds 1348c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 13491da177e4SLinus Torvalds 13501da177e4SLinus Torvalds /* Polish the bead hole. */ 13511da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 13521da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 13531da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 13541da177e4SLinus Torvalds atomic_set(&retval->refcnt, 1); 13551da177e4SLinus Torvalds 13561da177e4SLinus Torvalds nodata: 13571da177e4SLinus Torvalds return retval; 13581da177e4SLinus Torvalds } 13591da177e4SLinus Torvalds 13601da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 13611da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 13621da177e4SLinus Torvalds union sctp_addr *dest) 13631da177e4SLinus Torvalds { 1364f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 136516b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 13661da177e4SLinus Torvalds } 13671da177e4SLinus Torvalds 13681da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 13691da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 13701da177e4SLinus Torvalds { 13711da177e4SLinus Torvalds /* If we have a known transport, use that. */ 13721da177e4SLinus Torvalds if (chunk->transport) { 13736a1e5f33SAl Viro return &chunk->transport->ipaddr; 13741da177e4SLinus Torvalds } else { 13751da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 13766a1e5f33SAl Viro return &chunk->source; 13771da177e4SLinus Torvalds } 13781da177e4SLinus Torvalds } 13791da177e4SLinus Torvalds 13801da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 13811da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 13821da177e4SLinus Torvalds */ 1383072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 1384cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1385cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 13861da177e4SLinus Torvalds { 13871da177e4SLinus Torvalds struct sctp_chunk *retval; 13881da177e4SLinus Torvalds sctp_chunkhdr_t *chunk_hdr; 13891da177e4SLinus Torvalds struct sk_buff *skb; 13901da177e4SLinus Torvalds struct sock *sk; 13911da177e4SLinus Torvalds 13921da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 1393cea8768fSMarcelo Ricardo Leitner skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), gfp); 13941da177e4SLinus Torvalds if (!skb) 13951da177e4SLinus Torvalds goto nodata; 13961da177e4SLinus Torvalds 13971da177e4SLinus Torvalds /* Make room for the chunk header. */ 13981da177e4SLinus Torvalds chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); 13991da177e4SLinus Torvalds chunk_hdr->type = type; 14001da177e4SLinus Torvalds chunk_hdr->flags = flags; 14011da177e4SLinus Torvalds chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); 14021da177e4SLinus Torvalds 14031da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 1404cea8768fSMarcelo Ricardo Leitner retval = sctp_chunkify(skb, asoc, sk, gfp); 14051da177e4SLinus Torvalds if (!retval) { 14061da177e4SLinus Torvalds kfree_skb(skb); 14071da177e4SLinus Torvalds goto nodata; 14081da177e4SLinus Torvalds } 14091da177e4SLinus Torvalds 14101da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 14111da177e4SLinus Torvalds retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); 14121da177e4SLinus Torvalds 14134cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 14144cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 14154cd57c80SVlad Yasevich retval->auth = 1; 14164cd57c80SVlad Yasevich 14171da177e4SLinus Torvalds return retval; 14181da177e4SLinus Torvalds nodata: 14191da177e4SLinus Torvalds return NULL; 14201da177e4SLinus Torvalds } 14211da177e4SLinus Torvalds 1422072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 1423cea8768fSMarcelo Ricardo Leitner __u8 flags, int paylen, gfp_t gfp) 1424072017b4SVlad Yasevich { 1425cea8768fSMarcelo Ricardo Leitner return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp); 1426072017b4SVlad Yasevich } 1427072017b4SVlad Yasevich 1428072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 1429cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1430cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 1431072017b4SVlad Yasevich { 1432cea8768fSMarcelo Ricardo Leitner struct sctp_chunk *chunk; 1433072017b4SVlad Yasevich 1434cea8768fSMarcelo Ricardo Leitner chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp); 1435072017b4SVlad Yasevich if (chunk) 1436072017b4SVlad Yasevich sctp_control_set_owner_w(chunk); 1437072017b4SVlad Yasevich 1438072017b4SVlad Yasevich return chunk; 1439072017b4SVlad Yasevich } 14401da177e4SLinus Torvalds 14411da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 14421da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 14431da177e4SLinus Torvalds { 1444a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1445a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1446a08de64dSVlad Yasevich 1447c485658bSDaniel Borkmann consume_skb(chunk->skb); 1448c485658bSDaniel Borkmann consume_skb(chunk->auth_chunk); 14491da177e4SLinus Torvalds 14501da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 14511da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 14521da177e4SLinus Torvalds } 14531da177e4SLinus Torvalds 14541da177e4SLinus Torvalds /* Possibly, free the chunk. */ 14551da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 14561da177e4SLinus Torvalds { 14571da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 14581da177e4SLinus Torvalds if (chunk->msg) 14591da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 14601da177e4SLinus Torvalds 14611da177e4SLinus Torvalds sctp_chunk_put(chunk); 14621da177e4SLinus Torvalds } 14631da177e4SLinus Torvalds 14641da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 14651da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 14661da177e4SLinus Torvalds { 14671da177e4SLinus Torvalds atomic_inc(&ch->refcnt); 14681da177e4SLinus Torvalds } 14691da177e4SLinus Torvalds 14701da177e4SLinus Torvalds /* Release a reference to the chunk. */ 14711da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 14721da177e4SLinus Torvalds { 14731da177e4SLinus Torvalds if (atomic_dec_and_test(&ch->refcnt)) 14741da177e4SLinus Torvalds sctp_chunk_destroy(ch); 14751da177e4SLinus Torvalds } 14761da177e4SLinus Torvalds 14771da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 14781da177e4SLinus Torvalds * enough. 14791da177e4SLinus Torvalds */ 14801da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 14811da177e4SLinus Torvalds { 14821da177e4SLinus Torvalds void *target; 14831da177e4SLinus Torvalds void *padding; 14841da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 14858d614adeSWei Yongjun int padlen = WORD_ROUND(chunklen) - chunklen; 14861da177e4SLinus Torvalds 14871da177e4SLinus Torvalds padding = skb_put(chunk->skb, padlen); 14881da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 14891da177e4SLinus Torvalds 14901da177e4SLinus Torvalds memset(padding, 0, padlen); 14911da177e4SLinus Torvalds memcpy(target, data, len); 14921da177e4SLinus Torvalds 14931da177e4SLinus Torvalds /* Adjust the chunk length field. */ 14941da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 149527a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 14961da177e4SLinus Torvalds 14971da177e4SLinus Torvalds return target; 14981da177e4SLinus Torvalds } 14991da177e4SLinus Torvalds 15005fa782c2SNeil Horman /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient 15015fa782c2SNeil Horman * space in the chunk 15025fa782c2SNeil Horman */ 15036daaf0deSstephen hemminger static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk, 15045fa782c2SNeil Horman int len, const void *data) 15055fa782c2SNeil Horman { 15062e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) >= len) 15075fa782c2SNeil Horman return sctp_addto_chunk(chunk, len, data); 15085fa782c2SNeil Horman else 15095fa782c2SNeil Horman return NULL; 15105fa782c2SNeil Horman } 15115fa782c2SNeil Horman 15121da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 15131da177e4SLinus Torvalds * chunk is not big enough. 15141da177e4SLinus Torvalds * Returns a kernel err value. 15151da177e4SLinus Torvalds */ 1516e0eb093eSAl Viro int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 1517e0eb093eSAl Viro struct iov_iter *from) 15181da177e4SLinus Torvalds { 1519e0eb093eSAl Viro void *target; 1520e0eb093eSAl Viro ssize_t copied; 15211da177e4SLinus Torvalds 15221da177e4SLinus Torvalds /* Make room in chunk for data. */ 15231da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 15241da177e4SLinus Torvalds 15251da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 1526e0eb093eSAl Viro copied = copy_from_iter(target, len, from); 1527e0eb093eSAl Viro if (copied != len) 1528e0eb093eSAl Viro return -EFAULT; 15291da177e4SLinus Torvalds 15301da177e4SLinus Torvalds /* Adjust the chunk length field. */ 15311da177e4SLinus Torvalds chunk->chunk_hdr->length = 15321da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 153327a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 15341da177e4SLinus Torvalds 1535e0eb093eSAl Viro return 0; 15361da177e4SLinus Torvalds } 15371da177e4SLinus Torvalds 15381da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15391da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15401da177e4SLinus Torvalds */ 15411da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 15421da177e4SLinus Torvalds { 1543ab3e5e7bSVlad Yasevich struct sctp_datamsg *msg; 1544ab3e5e7bSVlad Yasevich struct sctp_chunk *lchunk; 1545ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 15461da177e4SLinus Torvalds __u16 ssn; 15471da177e4SLinus Torvalds __u16 sid; 15481da177e4SLinus Torvalds 15491da177e4SLinus Torvalds if (chunk->has_ssn) 15501da177e4SLinus Torvalds return; 15511da177e4SLinus Torvalds 1552ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1553ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1554ab3e5e7bSVlad Yasevich stream = &chunk->asoc->ssnmap->out; 1555ab3e5e7bSVlad Yasevich 1556ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1557ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1558ab3e5e7bSVlad Yasevich */ 1559ab3e5e7bSVlad Yasevich msg = chunk->msg; 1560ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1561ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 15621da177e4SLinus Torvalds ssn = 0; 15631da177e4SLinus Torvalds } else { 1564ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1565ab3e5e7bSVlad Yasevich ssn = sctp_ssn_next(stream, sid); 15661da177e4SLinus Torvalds else 1567ab3e5e7bSVlad Yasevich ssn = sctp_ssn_peek(stream, sid); 15681da177e4SLinus Torvalds } 15691da177e4SLinus Torvalds 1570ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1571ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1572ab3e5e7bSVlad Yasevich } 15731da177e4SLinus Torvalds } 15741da177e4SLinus Torvalds 15751da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15761da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15771da177e4SLinus Torvalds */ 15781da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 15791da177e4SLinus Torvalds { 15801da177e4SLinus Torvalds if (!chunk->has_tsn) { 15811da177e4SLinus Torvalds /* This is the last possible instant to 15821da177e4SLinus Torvalds * assign a TSN. 15831da177e4SLinus Torvalds */ 15841da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 15851da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 15861da177e4SLinus Torvalds chunk->has_tsn = 1; 15871da177e4SLinus Torvalds } 15881da177e4SLinus Torvalds } 15891da177e4SLinus Torvalds 15901da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 15911da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 15923182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1593dd0fc66fSAl Viro gfp_t gfp) 15941da177e4SLinus Torvalds { 15951da177e4SLinus Torvalds struct sctp_association *asoc; 15961da177e4SLinus Torvalds struct sk_buff *skb; 15971da177e4SLinus Torvalds sctp_scope_t scope; 15981da177e4SLinus Torvalds 15991da177e4SLinus Torvalds /* Create the bare association. */ 16001da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 16011da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 16021da177e4SLinus Torvalds if (!asoc) 16031da177e4SLinus Torvalds goto nodata; 16041da177e4SLinus Torvalds asoc->temp = 1; 16051da177e4SLinus Torvalds skb = chunk->skb; 16061da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1607e7487c86SMarcelo Ricardo Leitner SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1); 1608e7487c86SMarcelo Ricardo Leitner 16091da177e4SLinus Torvalds nodata: 16101da177e4SLinus Torvalds return asoc; 16111da177e4SLinus Torvalds } 16121da177e4SLinus Torvalds 16131da177e4SLinus Torvalds /* Build a cookie representing asoc. 16141da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 16151da177e4SLinus Torvalds */ 16161da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 16171da177e4SLinus Torvalds const struct sctp_association *asoc, 16181da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 16191da177e4SLinus Torvalds int *cookie_len, 16201da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len) 16211da177e4SLinus Torvalds { 16221da177e4SLinus Torvalds sctp_cookie_param_t *retval; 16231da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 16241da177e4SLinus Torvalds int headersize, bodysize; 16251da177e4SLinus Torvalds 16269834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 16279834a2bbSVlad Yasevich * any padding. 16289834a2bbSVlad Yasevich */ 16299834a2bbSVlad Yasevich headersize = sizeof(sctp_paramhdr_t) + 16309834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 16319834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 16321da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 16331da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 16341da177e4SLinus Torvalds 16351da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 16361da177e4SLinus Torvalds * functions simpler to write. 16371da177e4SLinus Torvalds */ 16381da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 16391da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 16401da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 16411da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 16421da177e4SLinus Torvalds 16431da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 16441da177e4SLinus Torvalds * out on the network. 16451da177e4SLinus Torvalds */ 1646af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1647af997d8cSArnaldo Carvalho de Melo if (!retval) 1648af997d8cSArnaldo Carvalho de Melo goto nodata; 1649af997d8cSArnaldo Carvalho de Melo 16501da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 16511da177e4SLinus Torvalds 16521da177e4SLinus Torvalds /* Set up the parameter header. */ 16531da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 16541da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 16551da177e4SLinus Torvalds 16561da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 16571da177e4SLinus Torvalds cookie->c = asoc->c; 16581da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 16591da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 16601da177e4SLinus Torvalds 16611da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 16621da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 16631da177e4SLinus Torvalds 16640f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 16650f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 16661da177e4SLinus Torvalds 16671da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 166852db882fSDaniel Borkmann cookie->c.expiration = ktime_add(asoc->cookie_life, 1669cb5e173eSMarcelo Ricardo Leitner ktime_get_real()); 16701da177e4SLinus Torvalds 16711da177e4SLinus Torvalds /* Copy the peer's init packet. */ 16721da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 16731da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 16741da177e4SLinus Torvalds 16751da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 16761da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 16771da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 16781da177e4SLinus Torvalds 16791da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 16805821c769SHerbert Xu SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); 16815821c769SHerbert Xu int err; 16821b489e11SHerbert Xu 16831da177e4SLinus Torvalds /* Sign the message. */ 16845821c769SHerbert Xu desc->tfm = sctp_sk(ep->base.sk)->hmac; 16855821c769SHerbert Xu desc->flags = 0; 16861da177e4SLinus Torvalds 16875821c769SHerbert Xu err = crypto_shash_setkey(desc->tfm, ep->secret_key, 16885821c769SHerbert Xu sizeof(ep->secret_key)) ?: 16895821c769SHerbert Xu crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize, 16905821c769SHerbert Xu cookie->signature); 16915821c769SHerbert Xu shash_desc_zero(desc); 16925821c769SHerbert Xu if (err) 16931b489e11SHerbert Xu goto free_cookie; 16941da177e4SLinus Torvalds } 16951da177e4SLinus Torvalds 16961da177e4SLinus Torvalds return retval; 16971b489e11SHerbert Xu 16981b489e11SHerbert Xu free_cookie: 16991b489e11SHerbert Xu kfree(retval); 17001b489e11SHerbert Xu nodata: 17011b489e11SHerbert Xu *cookie_len = 0; 17021b489e11SHerbert Xu return NULL; 17031da177e4SLinus Torvalds } 17041da177e4SLinus Torvalds 17051da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 17061da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 17071da177e4SLinus Torvalds const struct sctp_endpoint *ep, 17081da177e4SLinus Torvalds const struct sctp_association *asoc, 1709dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 17101da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 17111da177e4SLinus Torvalds { 17121da177e4SLinus Torvalds struct sctp_association *retval = NULL; 17131da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 17141da177e4SLinus Torvalds struct sctp_cookie *bear_cookie; 17151da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1716313e7b4dSVlad Yasevich __u8 *digest = ep->digest; 1717570617e7SDaniel Borkmann unsigned int len; 17181da177e4SLinus Torvalds sctp_scope_t scope; 17191da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 172052db882fSDaniel Borkmann ktime_t kt; 17211da177e4SLinus Torvalds 17229834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 17239834a2bbSVlad Yasevich * any padding. 17249834a2bbSVlad Yasevich */ 17259834a2bbSVlad Yasevich headersize = sizeof(sctp_chunkhdr_t) + 17269834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 17279834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 17281da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 17291da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 17301da177e4SLinus Torvalds 17311da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 17321da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 17331da177e4SLinus Torvalds * INIT chunk. 17341da177e4SLinus Torvalds */ 17351da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17361da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 17371da177e4SLinus Torvalds goto malformed; 17381da177e4SLinus Torvalds 17391da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 17401da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 17411da177e4SLinus Torvalds goto malformed; 17421da177e4SLinus Torvalds 17431da177e4SLinus Torvalds /* Process the cookie. */ 17441da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 17451da177e4SLinus Torvalds bear_cookie = &cookie->c; 17461da177e4SLinus Torvalds 17471da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 17481da177e4SLinus Torvalds goto no_hmac; 17491da177e4SLinus Torvalds 17501da177e4SLinus Torvalds /* Check the signature. */ 17515821c769SHerbert Xu { 17525821c769SHerbert Xu SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); 17535821c769SHerbert Xu int err; 17541da177e4SLinus Torvalds 17555821c769SHerbert Xu desc->tfm = sctp_sk(ep->base.sk)->hmac; 17565821c769SHerbert Xu desc->flags = 0; 17575821c769SHerbert Xu 17585821c769SHerbert Xu err = crypto_shash_setkey(desc->tfm, ep->secret_key, 17595821c769SHerbert Xu sizeof(ep->secret_key)) ?: 17605821c769SHerbert Xu crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize, 17615821c769SHerbert Xu digest); 17625821c769SHerbert Xu shash_desc_zero(desc); 17635821c769SHerbert Xu 17645821c769SHerbert Xu if (err) { 17651b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17661b489e11SHerbert Xu goto fail; 17671b489e11SHerbert Xu } 17685821c769SHerbert Xu } 17691da177e4SLinus Torvalds 17701da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 17711da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 17721da177e4SLinus Torvalds goto fail; 17731da177e4SLinus Torvalds } 17741da177e4SLinus Torvalds 17751da177e4SLinus Torvalds no_hmac: 17761da177e4SLinus Torvalds /* IG Section 2.35.2: 17771da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 17781da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 17791da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 17801da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 17811da177e4SLinus Torvalds * discarded, 17821da177e4SLinus Torvalds */ 17831da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 17841da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 17851da177e4SLinus Torvalds goto fail; 17861da177e4SLinus Torvalds } 17871da177e4SLinus Torvalds 17889b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 17891da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 17901da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 17911da177e4SLinus Torvalds goto fail; 17921da177e4SLinus Torvalds } 17931da177e4SLinus Torvalds 17941da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 17951da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 17961da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1797f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1798f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1799f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1800f236218bSVlad Yasevich * down the new association establishment instead of every packet. 18011da177e4SLinus Torvalds */ 1802f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 180352db882fSDaniel Borkmann kt = skb_get_ktime(skb); 1804f236218bSVlad Yasevich else 1805cb5e173eSMarcelo Ricardo Leitner kt = ktime_get_real(); 1806f236218bSVlad Yasevich 180767cb9366SDaniel Borkmann if (!asoc && ktime_before(bear_cookie->expiration, kt)) { 18081da177e4SLinus Torvalds /* 18091da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 18101da177e4SLinus Torvalds * 18111da177e4SLinus Torvalds * Cause of error 18121da177e4SLinus Torvalds * --------------- 18131da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 18141da177e4SLinus Torvalds * Cookie that has expired. 18151da177e4SLinus Torvalds */ 18161da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 18171da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18181da177e4SLinus Torvalds if (*errp) { 181952db882fSDaniel Borkmann suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); 182034bcca28SAl Viro __be32 n = htonl(usecs); 18211da177e4SLinus Torvalds 18221da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, 182300f1c2dfSWei Yongjun sizeof(n)); 182400f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(n), &n); 18251da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 18261da177e4SLinus Torvalds } else 18271da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18281da177e4SLinus Torvalds 18291da177e4SLinus Torvalds goto fail; 18301da177e4SLinus Torvalds } 18311da177e4SLinus Torvalds 18321da177e4SLinus Torvalds /* Make a new base association. */ 18331da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 18341da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 18351da177e4SLinus Torvalds if (!retval) { 18361da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18371da177e4SLinus Torvalds goto fail; 18381da177e4SLinus Torvalds } 18391da177e4SLinus Torvalds 18401da177e4SLinus Torvalds /* Set up our peer's port number. */ 18411da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 18421da177e4SLinus Torvalds 18431da177e4SLinus Torvalds /* Populate the association from the cookie. */ 18441da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 18451da177e4SLinus Torvalds 18461da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 18471da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 18481da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18491da177e4SLinus Torvalds goto fail; 18501da177e4SLinus Torvalds } 18511da177e4SLinus Torvalds 18521da177e4SLinus Torvalds /* Also, add the destination address. */ 18531da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1854f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1855133800d1SMarcelo Ricardo Leitner sizeof(chunk->dest), SCTP_ADDR_SRC, 1856133800d1SMarcelo Ricardo Leitner GFP_ATOMIC); 18571da177e4SLinus Torvalds } 18581da177e4SLinus Torvalds 18591da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 18601da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 18611da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 18621da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 18631da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 18640f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 18651da177e4SLinus Torvalds 18661da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 18671da177e4SLinus Torvalds return retval; 18681da177e4SLinus Torvalds 18691da177e4SLinus Torvalds fail: 18701da177e4SLinus Torvalds if (retval) 18711da177e4SLinus Torvalds sctp_association_free(retval); 18721da177e4SLinus Torvalds 18731da177e4SLinus Torvalds return NULL; 18741da177e4SLinus Torvalds 18751da177e4SLinus Torvalds malformed: 18761da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 18771da177e4SLinus Torvalds * malformed. 18781da177e4SLinus Torvalds */ 18791da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 18801da177e4SLinus Torvalds goto fail; 18811da177e4SLinus Torvalds } 18821da177e4SLinus Torvalds 18831da177e4SLinus Torvalds /******************************************************************** 18841da177e4SLinus Torvalds * 3rd Level Abstractions 18851da177e4SLinus Torvalds ********************************************************************/ 18861da177e4SLinus Torvalds 18871da177e4SLinus Torvalds struct __sctp_missing { 18889f81bcd9SAl Viro __be32 num_missing; 18899f81bcd9SAl Viro __be16 type; 1890bc10502dSEric Dumazet } __packed; 18911da177e4SLinus Torvalds 18921da177e4SLinus Torvalds /* 18931da177e4SLinus Torvalds * Report a missing mandatory parameter. 18941da177e4SLinus Torvalds */ 18951da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 18961da177e4SLinus Torvalds sctp_param_t paramtype, 18971da177e4SLinus Torvalds struct sctp_chunk *chunk, 18981da177e4SLinus Torvalds struct sctp_chunk **errp) 18991da177e4SLinus Torvalds { 19001da177e4SLinus Torvalds struct __sctp_missing report; 19011da177e4SLinus Torvalds __u16 len; 19021da177e4SLinus Torvalds 19031da177e4SLinus Torvalds len = WORD_ROUND(sizeof(report)); 19041da177e4SLinus Torvalds 19051da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 19061da177e4SLinus Torvalds * returning multiple unknown parameters. 19071da177e4SLinus Torvalds */ 19081da177e4SLinus Torvalds if (!*errp) 19091da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19101da177e4SLinus Torvalds 19111da177e4SLinus Torvalds if (*errp) { 19121da177e4SLinus Torvalds report.num_missing = htonl(1); 19131da177e4SLinus Torvalds report.type = paramtype; 1914ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 191500f1c2dfSWei Yongjun sizeof(report)); 191600f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 19171da177e4SLinus Torvalds } 19181da177e4SLinus Torvalds 19191da177e4SLinus Torvalds /* Stop processing this chunk. */ 19201da177e4SLinus Torvalds return 0; 19211da177e4SLinus Torvalds } 19221da177e4SLinus Torvalds 19231da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 19241da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 19251da177e4SLinus Torvalds struct sctp_chunk *chunk, 19261da177e4SLinus Torvalds struct sctp_chunk **errp) 19271da177e4SLinus Torvalds { 19281da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 19291da177e4SLinus Torvalds 19301da177e4SLinus Torvalds if (!*errp) 19311da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 19321da177e4SLinus Torvalds 19331da177e4SLinus Torvalds if (*errp) 193400f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 19351da177e4SLinus Torvalds 19361da177e4SLinus Torvalds /* Stop processing this chunk. */ 19371da177e4SLinus Torvalds return 0; 19381da177e4SLinus Torvalds } 19391da177e4SLinus Torvalds 19401da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 19411da177e4SLinus Torvalds struct sctp_paramhdr *param, 19421da177e4SLinus Torvalds const struct sctp_chunk *chunk, 19431da177e4SLinus Torvalds struct sctp_chunk **errp) 19441da177e4SLinus Torvalds { 19457ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 19467ab90804SVlad Yasevich * not reported. 19477ab90804SVlad Yasevich */ 19487ab90804SVlad Yasevich if (*errp) 19497ab90804SVlad Yasevich sctp_chunk_free(*errp); 19507ab90804SVlad Yasevich 19511da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1952ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 19531da177e4SLinus Torvalds 19541da177e4SLinus Torvalds return 0; 19551da177e4SLinus Torvalds } 19561da177e4SLinus Torvalds 19571da177e4SLinus Torvalds 19581da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 19591da177e4SLinus Torvalds * send back an indicator to the peer. 19601da177e4SLinus Torvalds */ 19611da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 19621da177e4SLinus Torvalds union sctp_params param, 19631da177e4SLinus Torvalds struct sctp_chunk *chunk, 19641da177e4SLinus Torvalds struct sctp_chunk **errp) 19651da177e4SLinus Torvalds { 19661da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 19671da177e4SLinus Torvalds 19687ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 19697ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 19707ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 19717ab90804SVlad Yasevich * them in the ABORT. 19727ab90804SVlad Yasevich */ 19737ab90804SVlad Yasevich if (*errp) 19747ab90804SVlad Yasevich sctp_chunk_free(*errp); 19757ab90804SVlad Yasevich 19761da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19771da177e4SLinus Torvalds 197800f1c2dfSWei Yongjun if (*errp) { 197900f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); 198000f1c2dfSWei Yongjun sctp_addto_chunk(*errp, len, param.v); 198100f1c2dfSWei Yongjun } 19821da177e4SLinus Torvalds 19831da177e4SLinus Torvalds /* Stop processing this chunk. */ 19841da177e4SLinus Torvalds return 0; 19851da177e4SLinus Torvalds } 19861da177e4SLinus Torvalds 1987f53b5b09SEric W. Biederman static int sctp_verify_ext_param(struct net *net, union sctp_params param) 1988d6701191SVlad Yasevich { 1989d6701191SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 1990d6701191SVlad Yasevich int have_auth = 0; 1991d6701191SVlad Yasevich int have_asconf = 0; 1992d6701191SVlad Yasevich int i; 1993d6701191SVlad Yasevich 1994d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 1995d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 1996d6701191SVlad Yasevich case SCTP_CID_AUTH: 1997d6701191SVlad Yasevich have_auth = 1; 1998d6701191SVlad Yasevich break; 1999d6701191SVlad Yasevich case SCTP_CID_ASCONF: 2000d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 2001d6701191SVlad Yasevich have_asconf = 1; 2002d6701191SVlad Yasevich break; 2003d6701191SVlad Yasevich } 2004d6701191SVlad Yasevich } 2005d6701191SVlad Yasevich 2006d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 2007d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 2008d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 2009d6701191SVlad Yasevich * mode. 2010d6701191SVlad Yasevich */ 2011e1fc3b14SEric W. Biederman if (net->sctp.addip_noauth) 2012d6701191SVlad Yasevich return 1; 2013d6701191SVlad Yasevich 2014e1fc3b14SEric W. Biederman if (net->sctp.addip_enable && !have_auth && have_asconf) 2015d6701191SVlad Yasevich return 0; 2016d6701191SVlad Yasevich 2017d6701191SVlad Yasevich return 1; 2018d6701191SVlad Yasevich } 2019d6701191SVlad Yasevich 2020131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 2021131a47e3SVlad Yasevich union sctp_params param) 2022131a47e3SVlad Yasevich { 2023e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 2024131a47e3SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 2025131a47e3SVlad Yasevich int i; 2026131a47e3SVlad Yasevich 2027131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 2028131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 2029131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 203028aa4c26SXin Long if (asoc->prsctp_enable && !asoc->peer.prsctp_capable) 2031131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 2032131a47e3SVlad Yasevich break; 2033730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 2034730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 2035730fc3d0SVlad Yasevich * supports AUTH. 2036730fc3d0SVlad Yasevich */ 2037b14878ccSVlad Yasevich if (asoc->ep->auth_enable) 2038730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 2039730fc3d0SVlad Yasevich break; 2040131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 2041131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 2042e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 204388799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 20446b2f9cb6SVlad Yasevich break; 2045131a47e3SVlad Yasevich default: 2046131a47e3SVlad Yasevich break; 2047131a47e3SVlad Yasevich } 2048131a47e3SVlad Yasevich } 2049131a47e3SVlad Yasevich } 2050131a47e3SVlad Yasevich 20511da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 20521da177e4SLinus Torvalds * 20531da177e4SLinus Torvalds * The Parameter Types are encoded such that the 20541da177e4SLinus Torvalds * highest-order two bits specify the action that must be 20551da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 20561da177e4SLinus Torvalds * Parameter Type. 20571da177e4SLinus Torvalds * 20587ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 20597ab90804SVlad Yasevich * parameters within this chunk 20601da177e4SLinus Torvalds * 20617ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 20627ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 20637ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 20641da177e4SLinus Torvalds * 20651da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 20661da177e4SLinus Torvalds * 20671da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 20681da177e4SLinus Torvalds * report the unrecognized parameter in an 20697ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 20701da177e4SLinus Torvalds * 20711da177e4SLinus Torvalds * Return value: 20727ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20737ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 20747ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 20751da177e4SLinus Torvalds */ 20767ab90804SVlad Yasevich static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc, 20771da177e4SLinus Torvalds union sctp_params param, 20781da177e4SLinus Torvalds struct sctp_chunk *chunk, 20791da177e4SLinus Torvalds struct sctp_chunk **errp) 20801da177e4SLinus Torvalds { 20817ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 20821da177e4SLinus Torvalds 20831da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 20841da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 20857ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20861da177e4SLinus Torvalds break; 20871da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 20881da177e4SLinus Torvalds break; 20897ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 20907ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20917ab90804SVlad Yasevich /* Fall through */ 20921da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 20931da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 20941da177e4SLinus Torvalds * returning multiple unknown parameters. 20951da177e4SLinus Torvalds */ 20961da177e4SLinus Torvalds if (NULL == *errp) 20975fa782c2SNeil Horman *errp = sctp_make_op_error_fixed(asoc, chunk); 20981da177e4SLinus Torvalds 20991da177e4SLinus Torvalds if (*errp) { 21002205a6eaSJiri Bohac if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM, 21012205a6eaSJiri Bohac WORD_ROUND(ntohs(param.p->length)))) 21025fa782c2SNeil Horman sctp_addto_chunk_fixed(*errp, 210300f1c2dfSWei Yongjun WORD_ROUND(ntohs(param.p->length)), 210400f1c2dfSWei Yongjun param.v); 21051da177e4SLinus Torvalds } else { 21061da177e4SLinus Torvalds /* If there is no memory for generating the ERROR 21071da177e4SLinus Torvalds * report as specified, an ABORT will be triggered 21081da177e4SLinus Torvalds * to the peer and the association won't be 21091da177e4SLinus Torvalds * established. 21101da177e4SLinus Torvalds */ 21117ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 21121da177e4SLinus Torvalds } 21131da177e4SLinus Torvalds break; 21141da177e4SLinus Torvalds default: 21151da177e4SLinus Torvalds break; 21161da177e4SLinus Torvalds } 21171da177e4SLinus Torvalds 21181da177e4SLinus Torvalds return retval; 21191da177e4SLinus Torvalds } 21201da177e4SLinus Torvalds 21217ab90804SVlad Yasevich /* Verify variable length parameters 21221da177e4SLinus Torvalds * Return values: 21237ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 21247ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 21257ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 21267ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 21271da177e4SLinus Torvalds */ 2128f53b5b09SEric W. Biederman static sctp_ierror_t sctp_verify_param(struct net *net, 2129b14878ccSVlad Yasevich const struct sctp_endpoint *ep, 2130f53b5b09SEric W. Biederman const struct sctp_association *asoc, 21311da177e4SLinus Torvalds union sctp_params param, 21321da177e4SLinus Torvalds sctp_cid_t cid, 21331da177e4SLinus Torvalds struct sctp_chunk *chunk, 21341da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 21351da177e4SLinus Torvalds { 213672da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 21377ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 213872da7b38SWei Yongjun __u16 n_elt, id = 0; 213972da7b38SWei Yongjun int i; 21401da177e4SLinus Torvalds 21411da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 21421da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 21431da177e4SLinus Torvalds * identified based on the chunk id. 21441da177e4SLinus Torvalds */ 21451da177e4SLinus Torvalds 21461da177e4SLinus Torvalds switch (param.p->type) { 21471da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 21481da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 21491da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 21501da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 21511da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 21521da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 21531da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 21541da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 21550f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2156d6701191SVlad Yasevich break; 2157d6701191SVlad Yasevich 2158131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2159f53b5b09SEric W. Biederman if (!sctp_verify_ext_param(net, param)) 2160d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 21611da177e4SLinus Torvalds break; 21621da177e4SLinus Torvalds 2163d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2164e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 2165d6de3097SVlad Yasevich break; 2166d6de3097SVlad Yasevich goto fallthrough; 2167d6de3097SVlad Yasevich 21681da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 21691da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 21707ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 21717ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21727ab90804SVlad Yasevich break; 2173131a47e3SVlad Yasevich 21741da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 217528aa4c26SXin Long if (ep->prsctp_enable) 21761da177e4SLinus Torvalds break; 2177730fc3d0SVlad Yasevich goto fallthrough; 2178730fc3d0SVlad Yasevich 2179730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2180b14878ccSVlad Yasevich if (!ep->auth_enable) 2181730fc3d0SVlad Yasevich goto fallthrough; 2182730fc3d0SVlad Yasevich 2183730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2184730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2185730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2186730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2187730fc3d0SVlad Yasevich */ 2188730fc3d0SVlad Yasevich if (SCTP_AUTH_RANDOM_LENGTH != 21897ab90804SVlad Yasevich ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) { 21907ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2191730fc3d0SVlad Yasevich chunk, err_chunk); 21927ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21937ab90804SVlad Yasevich } 2194730fc3d0SVlad Yasevich break; 2195730fc3d0SVlad Yasevich 2196730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2197b14878ccSVlad Yasevich if (!ep->auth_enable) 2198730fc3d0SVlad Yasevich goto fallthrough; 2199730fc3d0SVlad Yasevich 2200730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2201730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2202730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2203730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2204730fc3d0SVlad Yasevich */ 22057ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 22067ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2207730fc3d0SVlad Yasevich chunk, err_chunk); 22087ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 22097ab90804SVlad Yasevich } 2210730fc3d0SVlad Yasevich break; 2211730fc3d0SVlad Yasevich 2212730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2213b14878ccSVlad Yasevich if (!ep->auth_enable) 221472da7b38SWei Yongjun goto fallthrough; 221572da7b38SWei Yongjun 221672da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 221772da7b38SWei Yongjun n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1; 221872da7b38SWei Yongjun 221972da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 222072da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 222172da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 222272da7b38SWei Yongjun */ 222372da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 222472da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 222572da7b38SWei Yongjun 222672da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2227730fc3d0SVlad Yasevich break; 222872da7b38SWei Yongjun } 222972da7b38SWei Yongjun 223072da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 223172da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 223272da7b38SWei Yongjun err_chunk); 223372da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 223472da7b38SWei Yongjun } 223572da7b38SWei Yongjun break; 2236730fc3d0SVlad Yasevich fallthrough: 22371da177e4SLinus Torvalds default: 2238bb33381dSDaniel Borkmann pr_debug("%s: unrecognized param:%d for chunk:%d\n", 2239bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), cid); 2240bb33381dSDaniel Borkmann 22417ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 22421da177e4SLinus Torvalds break; 22431da177e4SLinus Torvalds } 22441da177e4SLinus Torvalds return retval; 22451da177e4SLinus Torvalds } 22461da177e4SLinus Torvalds 22471da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 2248b14878ccSVlad Yasevich int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 2249b14878ccSVlad Yasevich const struct sctp_association *asoc, sctp_cid_t cid, 2250b14878ccSVlad Yasevich sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, 22511da177e4SLinus Torvalds struct sctp_chunk **errp) 22521da177e4SLinus Torvalds { 22531da177e4SLinus Torvalds union sctp_params param; 22547613f5feSDaniel Borkmann bool has_cookie = false; 22557ab90804SVlad Yasevich int result; 22561da177e4SLinus Torvalds 22577613f5feSDaniel Borkmann /* Check for missing mandatory parameters. Note: Initial TSN is 22587613f5feSDaniel Borkmann * also mandatory, but is not checked here since the valid range 22597613f5feSDaniel Borkmann * is 0..2**32-1. RFC4960, section 3.3.3. 22607613f5feSDaniel Borkmann */ 22617613f5feSDaniel Borkmann if (peer_init->init_hdr.num_outbound_streams == 0 || 22627613f5feSDaniel Borkmann peer_init->init_hdr.num_inbound_streams == 0 || 22637613f5feSDaniel Borkmann peer_init->init_hdr.init_tag == 0 || 22647613f5feSDaniel Borkmann ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) 22657ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 22661da177e4SLinus Torvalds 22671da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22687613f5feSDaniel Borkmann if (param.p->type == SCTP_PARAM_STATE_COOKIE) 22697613f5feSDaniel Borkmann has_cookie = true; 22707613f5feSDaniel Borkmann } 22711da177e4SLinus Torvalds 22721da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 22731da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 22741da177e4SLinus Torvalds * The current param.p would point at the bad one. 22751da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 22761da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 22771da177e4SLinus Torvalds * error handling code build and send the packet. 22781da177e4SLinus Torvalds */ 22797ab90804SVlad Yasevich if (param.v != (void *)chunk->chunk_end) 22807ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 22811da177e4SLinus Torvalds 22821da177e4SLinus Torvalds /* The only missing mandatory param possible today is 22831da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 22841da177e4SLinus Torvalds */ 22857ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 22867ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 22871da177e4SLinus Torvalds chunk, errp); 22881da177e4SLinus Torvalds 22897ab90804SVlad Yasevich /* Verify all the variable length parameters */ 22901da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2291b14878ccSVlad Yasevich result = sctp_verify_param(net, ep, asoc, param, cid, 2292b14878ccSVlad Yasevich chunk, errp); 22937ab90804SVlad Yasevich switch (result) { 22947ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 22957ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 22961da177e4SLinus Torvalds return 0; 22977ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 22981da177e4SLinus Torvalds return 1; 22997ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 23007ab90804SVlad Yasevich default: 23017ab90804SVlad Yasevich break; 23021da177e4SLinus Torvalds } 23031da177e4SLinus Torvalds 23041da177e4SLinus Torvalds } /* for (loop through all parameters) */ 23051da177e4SLinus Torvalds 23061da177e4SLinus Torvalds return 1; 23071da177e4SLinus Torvalds } 23081da177e4SLinus Torvalds 23091da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 23101da177e4SLinus Torvalds * Returns 0 on failure, else success. 23111da177e4SLinus Torvalds * FIXME: This is an association method. 23121da177e4SLinus Torvalds */ 2313de6becdcSWei Yongjun int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, 23141da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2315dd0fc66fSAl Viro sctp_init_chunk_t *peer_init, gfp_t gfp) 23161da177e4SLinus Torvalds { 2317e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 23181da177e4SLinus Torvalds union sctp_params param; 23191da177e4SLinus Torvalds struct sctp_transport *transport; 23201da177e4SLinus Torvalds struct list_head *pos, *temp; 2321de6becdcSWei Yongjun struct sctp_af *af; 2322de6becdcSWei Yongjun union sctp_addr addr; 23231da177e4SLinus Torvalds char *cookie; 2324de6becdcSWei Yongjun int src_match = 0; 23251da177e4SLinus Torvalds 23261da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 23271da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 23281da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 23291da177e4SLinus Torvalds * of the INIT from the cookie. 23301da177e4SLinus Torvalds */ 23311da177e4SLinus Torvalds 23321da177e4SLinus Torvalds /* This implementation defaults to making the first transport 23331da177e4SLinus Torvalds * added as the primary transport. The source address seems to 23341da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 23351da177e4SLinus Torvalds */ 23366a1e5f33SAl Viro if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 23371da177e4SLinus Torvalds goto nomem; 2338de6becdcSWei Yongjun 2339de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) 2340de6becdcSWei Yongjun src_match = 1; 23411da177e4SLinus Torvalds 23421da177e4SLinus Torvalds /* Process the initialization parameters. */ 23431da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2344de6becdcSWei Yongjun if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 2345de6becdcSWei Yongjun param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { 2346de6becdcSWei Yongjun af = sctp_get_af_specific(param_type2af(param.p->type)); 2347de6becdcSWei Yongjun af->from_addr_param(&addr, param.addr, 2348de6becdcSWei Yongjun chunk->sctp_hdr->source, 0); 2349de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) 2350de6becdcSWei Yongjun src_match = 1; 2351de6becdcSWei Yongjun } 23521da177e4SLinus Torvalds 23531da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 23541da177e4SLinus Torvalds goto clean_up; 23551da177e4SLinus Torvalds } 23561da177e4SLinus Torvalds 2357de6becdcSWei Yongjun /* source address of chunk may not match any valid address */ 2358de6becdcSWei Yongjun if (!src_match) 2359de6becdcSWei Yongjun goto clean_up; 2360de6becdcSWei Yongjun 2361730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2362730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2363730fc3d0SVlad Yasevich */ 2364730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2365730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2366730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2367730fc3d0SVlad Yasevich 2368d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2369d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2370d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2371d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2372d6701191SVlad Yasevich * is what we'll do here. 23736b2f9cb6SVlad Yasevich */ 2374e1fc3b14SEric W. Biederman if (!net->sctp.addip_noauth && 237573d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 23766b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 23776b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 23786b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 237988799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2380d6701191SVlad Yasevich goto clean_up; 23816b2f9cb6SVlad Yasevich } 23826b2f9cb6SVlad Yasevich 23833f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 23843f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 23853f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 23863f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 23873f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 23883f7a87d2SFrank Filz } 23893f7a87d2SFrank Filz } 23903f7a87d2SFrank Filz 23911da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 23921da177e4SLinus Torvalds * order. 23931da177e4SLinus Torvalds */ 23941da177e4SLinus Torvalds asoc->peer.i.init_tag = 23951da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 23961da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 23971da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 23981da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 23991da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 24001da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 24011da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 24021da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 24031da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 24041da177e4SLinus Torvalds 24051da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 24061da177e4SLinus Torvalds * number of inbound streams. 24071da177e4SLinus Torvalds */ 24081da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 24091da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 24101da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 24111da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 24121da177e4SLinus Torvalds } 24131da177e4SLinus Torvalds 24141da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 24151da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 24161da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 24171da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 24181da177e4SLinus Torvalds } 24191da177e4SLinus Torvalds 24201da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 24211da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 24221da177e4SLinus Torvalds 24231da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 24241da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 24251da177e4SLinus Torvalds 24261da177e4SLinus Torvalds /* Copy cookie in case we need to resend COOKIE-ECHO. */ 24271da177e4SLinus Torvalds cookie = asoc->peer.cookie; 24281da177e4SLinus Torvalds if (cookie) { 2429af997d8cSArnaldo Carvalho de Melo asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); 24301da177e4SLinus Torvalds if (!asoc->peer.cookie) 24311da177e4SLinus Torvalds goto clean_up; 24321da177e4SLinus Torvalds } 24331da177e4SLinus Torvalds 24341da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 24351da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 24361da177e4SLinus Torvalds * advertised window). 24371da177e4SLinus Torvalds */ 24389dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 24399dbc15f0SRobert P. J. Day transports) { 24401da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 24411da177e4SLinus Torvalds } 24421da177e4SLinus Torvalds 24431da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 24448e1ee18cSVlad Yasevich if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 24458e1ee18cSVlad Yasevich asoc->peer.i.initial_tsn, gfp)) 24468e1ee18cSVlad Yasevich goto clean_up; 24471da177e4SLinus Torvalds 24481da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 24491da177e4SLinus Torvalds * 24501da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 24511da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 24521da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 24531da177e4SLinus Torvalds * stream sequence number shall be set to 0. 24541da177e4SLinus Torvalds */ 24551da177e4SLinus Torvalds 24563f7a87d2SFrank Filz /* Allocate storage for the negotiated streams if it is not a temporary 24573f7a87d2SFrank Filz * association. 24581da177e4SLinus Torvalds */ 24591da177e4SLinus Torvalds if (!asoc->temp) { 24601da177e4SLinus Torvalds int error; 24611da177e4SLinus Torvalds 24621da177e4SLinus Torvalds asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, 24631da177e4SLinus Torvalds asoc->c.sinit_num_ostreams, gfp); 24641da177e4SLinus Torvalds if (!asoc->ssnmap) 24651da177e4SLinus Torvalds goto clean_up; 24661da177e4SLinus Torvalds 246707d93967SVlad Yasevich error = sctp_assoc_set_id(asoc, gfp); 246807d93967SVlad Yasevich if (error) 24691da177e4SLinus Torvalds goto clean_up; 24701da177e4SLinus Torvalds } 24711da177e4SLinus Torvalds 24721da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 24731da177e4SLinus Torvalds * 24741da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 24751da177e4SLinus Torvalds * remote endpoint it should do the following: 24761da177e4SLinus Torvalds * ... 24771da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 24781da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 24791da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 24801da177e4SLinus Torvalds * association to the same value as the Initial TSN. 24811da177e4SLinus Torvalds */ 24821da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 24831da177e4SLinus Torvalds return 1; 24841da177e4SLinus Torvalds 24851da177e4SLinus Torvalds clean_up: 24861da177e4SLinus Torvalds /* Release the transport structures. */ 24871da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 24881da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2489add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2490add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 24911da177e4SLinus Torvalds } 24923f7a87d2SFrank Filz 24931da177e4SLinus Torvalds nomem: 24941da177e4SLinus Torvalds return 0; 24951da177e4SLinus Torvalds } 24961da177e4SLinus Torvalds 24971da177e4SLinus Torvalds 24981da177e4SLinus Torvalds /* Update asoc with the option described in param. 24991da177e4SLinus Torvalds * 25001da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 25011da177e4SLinus Torvalds * 25021da177e4SLinus Torvalds * asoc is the association to update. 25031da177e4SLinus Torvalds * param is the variable length parameter to use for update. 25041da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 25051da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 25061da177e4SLinus Torvalds * work we do. In particular, we should not build transport 25071da177e4SLinus Torvalds * structures for the addresses. 25081da177e4SLinus Torvalds */ 25091da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 25101da177e4SLinus Torvalds union sctp_params param, 25111da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2512dd0fc66fSAl Viro gfp_t gfp) 25131da177e4SLinus Torvalds { 2514e7ff4a70SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 25151da177e4SLinus Torvalds union sctp_addr addr; 25161da177e4SLinus Torvalds int i; 25171da177e4SLinus Torvalds __u16 sat; 25181da177e4SLinus Torvalds int retval = 1; 25191da177e4SLinus Torvalds sctp_scope_t scope; 25203ef0a25bSArnd Bergmann u32 stale; 25211da177e4SLinus Torvalds struct sctp_af *af; 2522d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 2523d6de3097SVlad Yasevich struct sctp_transport *t; 2524b14878ccSVlad Yasevich struct sctp_endpoint *ep = asoc->ep; 25251da177e4SLinus Torvalds 25261da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 25271da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 25281da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 25291da177e4SLinus Torvalds */ 25301da177e4SLinus Torvalds switch (param.p->type) { 25311da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25321da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 25331da177e4SLinus Torvalds break; 25347dab83deSVlad Yasevich goto do_addr_param; 25357dab83deSVlad Yasevich 25361da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25377dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 25387dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 25397dab83deSVlad Yasevich break; 25407dab83deSVlad Yasevich do_addr_param: 25411da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2542dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 25431da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2544e7ff4a70SEric W. Biederman if (sctp_in_scope(net, &addr, scope)) 2545dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 25461da177e4SLinus Torvalds return 0; 25471da177e4SLinus Torvalds break; 25481da177e4SLinus Torvalds 25491da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 2550e1fc3b14SEric W. Biederman if (!net->sctp.cookie_preserve_enable) 25511da177e4SLinus Torvalds break; 25521da177e4SLinus Torvalds 25531da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 25541da177e4SLinus Torvalds 25551da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 25561da177e4SLinus Torvalds * (1/1000sec). 25571da177e4SLinus Torvalds */ 255852db882fSDaniel Borkmann asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); 25591da177e4SLinus Torvalds break; 25601da177e4SLinus Torvalds 25611da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 2562bb33381dSDaniel Borkmann pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); 25631da177e4SLinus Torvalds break; 25641da177e4SLinus Torvalds 25651da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 25661da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 25671da177e4SLinus Torvalds * ones are really set by the peer. 25681da177e4SLinus Torvalds */ 25691da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 25701da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 25711da177e4SLinus Torvalds 2572140ee960SGui Jianfeng /* Assume that peer supports the address family 2573140ee960SGui Jianfeng * by which it sends a packet. 2574140ee960SGui Jianfeng */ 2575140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2576140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2577140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2578140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2579140ee960SGui Jianfeng 25801da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 25811da177e4SLinus Torvalds sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 25821da177e4SLinus Torvalds if (sat) 25831da177e4SLinus Torvalds sat /= sizeof(__u16); 25841da177e4SLinus Torvalds 25851da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 25861da177e4SLinus Torvalds switch (param.sat->types[i]) { 25871da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25881da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 25891da177e4SLinus Torvalds break; 25901da177e4SLinus Torvalds 25911da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25926e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 25931da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 25941da177e4SLinus Torvalds break; 25951da177e4SLinus Torvalds 25961da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 25971da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 25981da177e4SLinus Torvalds break; 25991da177e4SLinus Torvalds 26001da177e4SLinus Torvalds default: /* Just ignore anything else. */ 26011da177e4SLinus Torvalds break; 26023ff50b79SStephen Hemminger } 26031da177e4SLinus Torvalds } 26041da177e4SLinus Torvalds break; 26051da177e4SLinus Torvalds 26061da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 26071da177e4SLinus Torvalds asoc->peer.cookie_len = 26081da177e4SLinus Torvalds ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 26091da177e4SLinus Torvalds asoc->peer.cookie = param.cookie->body; 26101da177e4SLinus Torvalds break; 26111da177e4SLinus Torvalds 26121da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 26131da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 26141da177e4SLinus Torvalds break; 26151da177e4SLinus Torvalds 26161da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 26171da177e4SLinus Torvalds /* Rejected during verify stage. */ 26181da177e4SLinus Torvalds break; 26191da177e4SLinus Torvalds 26201da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 26211da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 26221da177e4SLinus Torvalds break; 26231da177e4SLinus Torvalds 26240f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2625e69c4e0fSVlad Yasevich asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); 26261da177e4SLinus Torvalds break; 26271da177e4SLinus Torvalds 2628d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2629e1fc3b14SEric W. Biederman if (!net->sctp.addip_enable) 26300ef46e28SVlad Yasevich goto fall_through; 26310ef46e28SVlad Yasevich 2632d6de3097SVlad Yasevich addr_param = param.v + sizeof(sctp_addip_param_t); 2633d6de3097SVlad Yasevich 2634cfbf654eSSaran Maruti Ramanara af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 2635e40607cbSDaniel Borkmann if (af == NULL) 2636e40607cbSDaniel Borkmann break; 2637e40607cbSDaniel Borkmann 2638d6de3097SVlad Yasevich af->from_addr_param(&addr, addr_param, 2639d6de3097SVlad Yasevich htons(asoc->peer.port), 0); 2640d6de3097SVlad Yasevich 2641d6de3097SVlad Yasevich /* if the address is invalid, we can't process it. 2642d6de3097SVlad Yasevich * XXX: see spec for what to do. 2643d6de3097SVlad Yasevich */ 2644d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2645d6de3097SVlad Yasevich break; 2646d6de3097SVlad Yasevich 2647d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2648d6de3097SVlad Yasevich if (!t) 2649d6de3097SVlad Yasevich break; 2650d6de3097SVlad Yasevich 2651d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2652d6de3097SVlad Yasevich break; 2653d6de3097SVlad Yasevich 2654131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2655131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2656131a47e3SVlad Yasevich break; 2657131a47e3SVlad Yasevich 26581da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 265928aa4c26SXin Long if (asoc->prsctp_enable) { 26601da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 26611da177e4SLinus Torvalds break; 26621da177e4SLinus Torvalds } 26631da177e4SLinus Torvalds /* Fall Through */ 2664730fc3d0SVlad Yasevich goto fall_through; 2665730fc3d0SVlad Yasevich 2666730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2667b14878ccSVlad Yasevich if (!ep->auth_enable) 2668730fc3d0SVlad Yasevich goto fall_through; 2669730fc3d0SVlad Yasevich 2670730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2671730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2672730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2673730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2674730fc3d0SVlad Yasevich retval = 0; 2675730fc3d0SVlad Yasevich break; 2676730fc3d0SVlad Yasevich } 2677730fc3d0SVlad Yasevich break; 2678730fc3d0SVlad Yasevich 2679730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2680b14878ccSVlad Yasevich if (!ep->auth_enable) 2681730fc3d0SVlad Yasevich goto fall_through; 2682730fc3d0SVlad Yasevich 2683730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2684730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2685730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2686730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2687730fc3d0SVlad Yasevich retval = 0; 2688730fc3d0SVlad Yasevich break; 2689730fc3d0SVlad Yasevich } 2690730fc3d0SVlad Yasevich 2691730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2692730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2693730fc3d0SVlad Yasevich break; 2694730fc3d0SVlad Yasevich 2695730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2696b14878ccSVlad Yasevich if (!ep->auth_enable) 2697730fc3d0SVlad Yasevich goto fall_through; 2698730fc3d0SVlad Yasevich 2699730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2700730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2701730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2702730fc3d0SVlad Yasevich retval = 0; 2703730fc3d0SVlad Yasevich break; 2704730fc3d0SVlad Yasevich fall_through: 27051da177e4SLinus Torvalds default: 27061da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 27071da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 27081da177e4SLinus Torvalds * called prior to this routine. Simply log the error 27091da177e4SLinus Torvalds * here. 27101da177e4SLinus Torvalds */ 2711bb33381dSDaniel Borkmann pr_debug("%s: ignoring param:%d for association:%p.\n", 2712bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), asoc); 27131da177e4SLinus Torvalds break; 27143ff50b79SStephen Hemminger } 27151da177e4SLinus Torvalds 27161da177e4SLinus Torvalds return retval; 27171da177e4SLinus Torvalds } 27181da177e4SLinus Torvalds 27191da177e4SLinus Torvalds /* Select a new verification tag. */ 27201da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 27211da177e4SLinus Torvalds { 27221da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 27231da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 27241da177e4SLinus Torvalds */ 27251da177e4SLinus Torvalds __u32 x; 27261da177e4SLinus Torvalds 27271da177e4SLinus Torvalds do { 27281da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 27291da177e4SLinus Torvalds } while (x == 0); 27301da177e4SLinus Torvalds 27311da177e4SLinus Torvalds return x; 27321da177e4SLinus Torvalds } 27331da177e4SLinus Torvalds 27341da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 27351da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 27361da177e4SLinus Torvalds { 27371da177e4SLinus Torvalds __u32 retval; 27381da177e4SLinus Torvalds 27391da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 27401da177e4SLinus Torvalds return retval; 27411da177e4SLinus Torvalds } 27421da177e4SLinus Torvalds 27431da177e4SLinus Torvalds /* 27441da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 27451da177e4SLinus Torvalds * 0 1 2 3 27461da177e4SLinus 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 27471da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27481da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 27491da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27501da177e4SLinus Torvalds * | Serial Number | 27511da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27521da177e4SLinus Torvalds * | Address Parameter | 27531da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27541da177e4SLinus Torvalds * | ASCONF Parameter #1 | 27551da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27561da177e4SLinus Torvalds * \ \ 27571da177e4SLinus Torvalds * / .... / 27581da177e4SLinus Torvalds * \ \ 27591da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27601da177e4SLinus Torvalds * | ASCONF Parameter #N | 27611da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27621da177e4SLinus Torvalds * 27631da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 27641da177e4SLinus Torvalds */ 27651da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 27661da177e4SLinus Torvalds union sctp_addr *addr, 27671da177e4SLinus Torvalds int vparam_len) 27681da177e4SLinus Torvalds { 27691da177e4SLinus Torvalds sctp_addiphdr_t asconf; 27701da177e4SLinus Torvalds struct sctp_chunk *retval; 27711da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 27721da177e4SLinus Torvalds union sctp_addr_param addrparam; 27731da177e4SLinus Torvalds int addrlen; 27741da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 27751da177e4SLinus Torvalds 27761da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 27771da177e4SLinus Torvalds if (!addrlen) 27781da177e4SLinus Torvalds return NULL; 27791da177e4SLinus Torvalds length += addrlen; 27801da177e4SLinus Torvalds 27811da177e4SLinus Torvalds /* Create the chunk. */ 2782cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length, 2783cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 27841da177e4SLinus Torvalds if (!retval) 27851da177e4SLinus Torvalds return NULL; 27861da177e4SLinus Torvalds 27871da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 27881da177e4SLinus Torvalds 27891da177e4SLinus Torvalds retval->subh.addip_hdr = 27901da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 27911da177e4SLinus Torvalds retval->param_hdr.v = 27921da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 27931da177e4SLinus Torvalds 27941da177e4SLinus Torvalds return retval; 27951da177e4SLinus Torvalds } 27961da177e4SLinus Torvalds 27971da177e4SLinus Torvalds /* ADDIP 27981da177e4SLinus Torvalds * 3.2.1 Add IP Address 27991da177e4SLinus Torvalds * 0 1 2 3 28001da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 28011da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28021da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 28031da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28041da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28051da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28061da177e4SLinus Torvalds * | Address Parameter | 28071da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28081da177e4SLinus Torvalds * 28091da177e4SLinus Torvalds * 3.2.2 Delete IP Address 28101da177e4SLinus Torvalds * 0 1 2 3 28111da177e4SLinus 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 28121da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28131da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 28141da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28151da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28161da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28171da177e4SLinus Torvalds * | Address Parameter | 28181da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28191da177e4SLinus Torvalds * 28201da177e4SLinus Torvalds */ 28211da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 28221da177e4SLinus Torvalds union sctp_addr *laddr, 28231da177e4SLinus Torvalds struct sockaddr *addrs, 28241da177e4SLinus Torvalds int addrcnt, 2825dbc16db1SAl Viro __be16 flags) 28261da177e4SLinus Torvalds { 28271da177e4SLinus Torvalds sctp_addip_param_t param; 28281da177e4SLinus Torvalds struct sctp_chunk *retval; 28291da177e4SLinus Torvalds union sctp_addr_param addr_param; 28301da177e4SLinus Torvalds union sctp_addr *addr; 28311da177e4SLinus Torvalds void *addr_buf; 28321da177e4SLinus Torvalds struct sctp_af *af; 28331da177e4SLinus Torvalds int paramlen = sizeof(param); 28341da177e4SLinus Torvalds int addr_param_len = 0; 28351da177e4SLinus Torvalds int totallen = 0; 28361da177e4SLinus Torvalds int i; 28378a07eb0aSMichio Honda int del_pickup = 0; 28381da177e4SLinus Torvalds 28391da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 28401da177e4SLinus Torvalds addr_buf = addrs; 28411da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2842ea110733SJoe Perches addr = addr_buf; 28431da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28441da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28451da177e4SLinus Torvalds 28461da177e4SLinus Torvalds totallen += paramlen; 28471da177e4SLinus Torvalds totallen += addr_param_len; 28481da177e4SLinus Torvalds 28491da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28508a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending && !del_pickup) { 28518a07eb0aSMichio Honda /* reuse the parameter length from the same scope one */ 28528a07eb0aSMichio Honda totallen += paramlen; 28538a07eb0aSMichio Honda totallen += addr_param_len; 28548a07eb0aSMichio Honda del_pickup = 1; 2855bb33381dSDaniel Borkmann 2856bb33381dSDaniel Borkmann pr_debug("%s: picked same-scope del_pending addr, " 2857bb33381dSDaniel Borkmann "totallen for all addresses is %d\n", 2858bb33381dSDaniel Borkmann __func__, totallen); 28598a07eb0aSMichio Honda } 28601da177e4SLinus Torvalds } 28611da177e4SLinus Torvalds 28621da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 28631da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 28641da177e4SLinus Torvalds if (!retval) 28651da177e4SLinus Torvalds return NULL; 28661da177e4SLinus Torvalds 28671da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 28681da177e4SLinus Torvalds addr_buf = addrs; 28691da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2870ea110733SJoe Perches addr = addr_buf; 28711da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28721da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28731da177e4SLinus Torvalds param.param_hdr.type = flags; 28741da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 28751da177e4SLinus Torvalds param.crr_id = i; 28761da177e4SLinus Torvalds 28771da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 28781da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 28791da177e4SLinus Torvalds 28801da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28811da177e4SLinus Torvalds } 28828a07eb0aSMichio Honda if (flags == SCTP_PARAM_ADD_IP && del_pickup) { 28838a07eb0aSMichio Honda addr = asoc->asconf_addr_del_pending; 28848a07eb0aSMichio Honda af = sctp_get_af_specific(addr->v4.sin_family); 28858a07eb0aSMichio Honda addr_param_len = af->to_addr_param(addr, &addr_param); 28868a07eb0aSMichio Honda param.param_hdr.type = SCTP_PARAM_DEL_IP; 28878a07eb0aSMichio Honda param.param_hdr.length = htons(paramlen + addr_param_len); 28888a07eb0aSMichio Honda param.crr_id = i; 28898a07eb0aSMichio Honda 28908a07eb0aSMichio Honda sctp_addto_chunk(retval, paramlen, ¶m); 28918a07eb0aSMichio Honda sctp_addto_chunk(retval, addr_param_len, &addr_param); 28928a07eb0aSMichio Honda } 28931da177e4SLinus Torvalds return retval; 28941da177e4SLinus Torvalds } 28951da177e4SLinus Torvalds 28961da177e4SLinus Torvalds /* ADDIP 28971da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 28981da177e4SLinus Torvalds * 0 1 2 3 28991da177e4SLinus 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 29001da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29011da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 29021da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29031da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 29041da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29051da177e4SLinus Torvalds * | Address Parameter | 29061da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29071da177e4SLinus Torvalds * 29081da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 29091da177e4SLinus Torvalds */ 29101da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 29111da177e4SLinus Torvalds union sctp_addr *addr) 29121da177e4SLinus Torvalds { 29131da177e4SLinus Torvalds sctp_addip_param_t param; 29141da177e4SLinus Torvalds struct sctp_chunk *retval; 29151da177e4SLinus Torvalds int len = sizeof(param); 29161da177e4SLinus Torvalds union sctp_addr_param addrparam; 29171da177e4SLinus Torvalds int addrlen; 29181da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 29191da177e4SLinus Torvalds 29201da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 29211da177e4SLinus Torvalds if (!addrlen) 29221da177e4SLinus Torvalds return NULL; 29231da177e4SLinus Torvalds len += addrlen; 29241da177e4SLinus Torvalds 29251da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 29261da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 29271da177e4SLinus Torvalds if (!retval) 29281da177e4SLinus Torvalds return NULL; 29291da177e4SLinus Torvalds 29301da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 29311da177e4SLinus Torvalds param.param_hdr.length = htons(len); 29321da177e4SLinus Torvalds param.crr_id = 0; 29331da177e4SLinus Torvalds 29341da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 29351da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 29361da177e4SLinus Torvalds 29371da177e4SLinus Torvalds return retval; 29381da177e4SLinus Torvalds } 29391da177e4SLinus Torvalds 29401da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 29411da177e4SLinus Torvalds * 0 1 2 3 29421da177e4SLinus 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 29431da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29441da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 29451da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29461da177e4SLinus Torvalds * | Serial Number | 29471da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29481da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 29491da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29501da177e4SLinus Torvalds * \ \ 29511da177e4SLinus Torvalds * / .... / 29521da177e4SLinus Torvalds * \ \ 29531da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29541da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 29551da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29561da177e4SLinus Torvalds * 29571da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 29581da177e4SLinus Torvalds */ 29591da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 29601da177e4SLinus Torvalds __u32 serial, int vparam_len) 29611da177e4SLinus Torvalds { 29621da177e4SLinus Torvalds sctp_addiphdr_t asconf; 29631da177e4SLinus Torvalds struct sctp_chunk *retval; 29641da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 29651da177e4SLinus Torvalds 29661da177e4SLinus Torvalds /* Create the chunk. */ 2967cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length, 2968cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 29691da177e4SLinus Torvalds if (!retval) 29701da177e4SLinus Torvalds return NULL; 29711da177e4SLinus Torvalds 29721da177e4SLinus Torvalds asconf.serial = htonl(serial); 29731da177e4SLinus Torvalds 29741da177e4SLinus Torvalds retval->subh.addip_hdr = 29751da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 29761da177e4SLinus Torvalds 29771da177e4SLinus Torvalds return retval; 29781da177e4SLinus Torvalds } 29791da177e4SLinus Torvalds 29801da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 29819f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 2982dbc16db1SAl Viro __be16 err_code, sctp_addip_param_t *asconf_param) 29831da177e4SLinus Torvalds { 29841da177e4SLinus Torvalds sctp_addip_param_t ack_param; 29851da177e4SLinus Torvalds sctp_errhdr_t err_param; 29861da177e4SLinus Torvalds int asconf_param_len = 0; 29871da177e4SLinus Torvalds int err_param_len = 0; 2988dbc16db1SAl Viro __be16 response_type; 29891da177e4SLinus Torvalds 29901da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 29911da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 29921da177e4SLinus Torvalds } else { 29931da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 29941da177e4SLinus Torvalds err_param_len = sizeof(err_param); 29951da177e4SLinus Torvalds if (asconf_param) 29961da177e4SLinus Torvalds asconf_param_len = 29971da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 29981da177e4SLinus Torvalds } 29991da177e4SLinus Torvalds 30001da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 30011da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 30021da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 30031da177e4SLinus Torvalds err_param_len + 30041da177e4SLinus Torvalds asconf_param_len); 30051da177e4SLinus Torvalds ack_param.crr_id = crr_id; 30061da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 30071da177e4SLinus Torvalds 30081da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 30091da177e4SLinus Torvalds return; 30101da177e4SLinus Torvalds 30111da177e4SLinus Torvalds /* Add Error Cause parameter. */ 30121da177e4SLinus Torvalds err_param.cause = err_code; 30131da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 30141da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 30151da177e4SLinus Torvalds 30161da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 30171da177e4SLinus Torvalds if (asconf_param) 30181da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 30191da177e4SLinus Torvalds } 30201da177e4SLinus Torvalds 30211da177e4SLinus Torvalds /* Process a asconf parameter. */ 3022dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 30231da177e4SLinus Torvalds struct sctp_chunk *asconf, 30241da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 30251da177e4SLinus Torvalds { 30261da177e4SLinus Torvalds struct sctp_transport *peer; 30271da177e4SLinus Torvalds struct sctp_af *af; 30281da177e4SLinus Torvalds union sctp_addr addr; 30291da177e4SLinus Torvalds union sctp_addr_param *addr_param; 30301da177e4SLinus Torvalds 3031ea110733SJoe Perches addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); 3032c1cc678aSPatrick McHardy 303344e65c1eSWei Yongjun if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && 303444e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && 303544e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) 303644e65c1eSWei Yongjun return SCTP_ERROR_UNKNOWN_PARAM; 303744e65c1eSWei Yongjun 30386a435732SShan Wei switch (addr_param->p.type) { 3039c4492586SWei Yongjun case SCTP_PARAM_IPV6_ADDRESS: 3040c4492586SWei Yongjun if (!asoc->peer.ipv6_address) 3041945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3042c4492586SWei Yongjun break; 3043c4492586SWei Yongjun case SCTP_PARAM_IPV4_ADDRESS: 3044c4492586SWei Yongjun if (!asoc->peer.ipv4_address) 3045945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3046c4492586SWei Yongjun break; 3047c4492586SWei Yongjun default: 3048945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3049c4492586SWei Yongjun } 3050c4492586SWei Yongjun 30516a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 30521da177e4SLinus Torvalds if (unlikely(!af)) 3053945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 30541da177e4SLinus Torvalds 3055dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); 305642e30bf3SVlad Yasevich 305742e30bf3SVlad Yasevich /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast 305842e30bf3SVlad Yasevich * or multicast address. 305942e30bf3SVlad Yasevich * (note: wildcard is permitted and requires special handling so 306042e30bf3SVlad Yasevich * make sure we check for that) 306142e30bf3SVlad Yasevich */ 306242e30bf3SVlad Yasevich if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) 3063945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 306442e30bf3SVlad Yasevich 30651da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 30661da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 306742e30bf3SVlad Yasevich /* Section 4.2.1: 306842e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the source 306942e30bf3SVlad Yasevich * address of the packet MUST be added. 307042e30bf3SVlad Yasevich */ 307142e30bf3SVlad Yasevich if (af->is_any(&addr)) 307242e30bf3SVlad Yasevich memcpy(&addr, &asconf->source, sizeof(addr)); 307342e30bf3SVlad Yasevich 30741da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 30751da177e4SLinus Torvalds * request and does not have the local resources to add this 30761da177e4SLinus Torvalds * new address to the association, it MUST return an Error 30771da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 30781da177e4SLinus Torvalds * Due to Resource Shortage'. 30791da177e4SLinus Torvalds */ 30801da177e4SLinus Torvalds 3081dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 30821da177e4SLinus Torvalds if (!peer) 30831da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 30841da177e4SLinus Torvalds 30851da177e4SLinus Torvalds /* Start the heartbeat timer. */ 3086ba6f5e33SMarcelo Ricardo Leitner sctp_transport_reset_hb_timer(peer); 30876af29cccSMichio Honda asoc->new_transport = peer; 30881da177e4SLinus Torvalds break; 30891da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 30901da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 30911da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 30921da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 30931da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 30941da177e4SLinus Torvalds */ 309542e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 30961da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 30971da177e4SLinus Torvalds 30981da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 30991da177e4SLinus Torvalds * address which is also the source address of the IP packet 31001da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 31011da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 31021da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 31031da177e4SLinus Torvalds * Delete Source IP Address' 31041da177e4SLinus Torvalds */ 3105b1364104SMichio Honda if (sctp_cmp_addr_exact(&asconf->source, &addr)) 31061da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 31071da177e4SLinus Torvalds 310842e30bf3SVlad Yasevich /* Section 4.2.2 310942e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 311042e30bf3SVlad Yasevich * addresses of the peer except the source address of the 311142e30bf3SVlad Yasevich * packet MUST be deleted. 311242e30bf3SVlad Yasevich */ 311342e30bf3SVlad Yasevich if (af->is_any(&addr)) { 311442e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 311542e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 311642e30bf3SVlad Yasevich asconf->transport); 31177c5a9461Slucien return SCTP_ERROR_NO_ERROR; 31187c5a9461Slucien } 31197c5a9461Slucien 31207c5a9461Slucien /* If the address is not part of the association, the 31217c5a9461Slucien * ASCONF-ACK with Error Cause Indication Parameter 31227c5a9461Slucien * which including cause of Unresolvable Address should 31237c5a9461Slucien * be sent. 31247c5a9461Slucien */ 31257c5a9461Slucien peer = sctp_assoc_lookup_paddr(asoc, &addr); 31267c5a9461Slucien if (!peer) 31277c5a9461Slucien return SCTP_ERROR_DNS_FAILED; 31287c5a9461Slucien 31297c5a9461Slucien sctp_assoc_rm_peer(asoc, peer); 31301da177e4SLinus Torvalds break; 31311da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 313242e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 313342e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 313442e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 313542e30bf3SVlad Yasevich * primary. 313642e30bf3SVlad Yasevich */ 313742e30bf3SVlad Yasevich if (af->is_any(&addr)) 313842e30bf3SVlad Yasevich memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); 313942e30bf3SVlad Yasevich 3140dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 31411da177e4SLinus Torvalds if (!peer) 3142945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 31431da177e4SLinus Torvalds 31441da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 31451da177e4SLinus Torvalds break; 31461da177e4SLinus Torvalds } 31471da177e4SLinus Torvalds 31481da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 31491da177e4SLinus Torvalds } 31501da177e4SLinus Torvalds 31516f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 31529de7922bSDaniel Borkmann bool sctp_verify_asconf(const struct sctp_association *asoc, 31539de7922bSDaniel Borkmann struct sctp_chunk *chunk, bool addr_param_needed, 31549de7922bSDaniel Borkmann struct sctp_paramhdr **errp) 31559de7922bSDaniel Borkmann { 31569de7922bSDaniel Borkmann sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) chunk->chunk_hdr; 31576f4c618dSWei Yongjun union sctp_params param; 31589de7922bSDaniel Borkmann bool addr_param_seen = false; 31596f4c618dSWei Yongjun 31609de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 31619de7922bSDaniel Borkmann size_t length = ntohs(param.p->length); 31629de7922bSDaniel Borkmann 31636f4c618dSWei Yongjun *errp = param.p; 31646f4c618dSWei Yongjun switch (param.p->type) { 31659de7922bSDaniel Borkmann case SCTP_PARAM_ERR_CAUSE: 31669de7922bSDaniel Borkmann break; 31679de7922bSDaniel Borkmann case SCTP_PARAM_IPV4_ADDRESS: 31689de7922bSDaniel Borkmann if (length != sizeof(sctp_ipv4addr_param_t)) 31699de7922bSDaniel Borkmann return false; 3170ce7b4cccSlucien /* ensure there is only one addr param and it's in the 3171ce7b4cccSlucien * beginning of addip_hdr params, or we reject it. 3172ce7b4cccSlucien */ 3173ce7b4cccSlucien if (param.v != addip->addip_hdr.params) 3174ce7b4cccSlucien return false; 31759de7922bSDaniel Borkmann addr_param_seen = true; 31769de7922bSDaniel Borkmann break; 31779de7922bSDaniel Borkmann case SCTP_PARAM_IPV6_ADDRESS: 31789de7922bSDaniel Borkmann if (length != sizeof(sctp_ipv6addr_param_t)) 31799de7922bSDaniel Borkmann return false; 3180ce7b4cccSlucien if (param.v != addip->addip_hdr.params) 3181ce7b4cccSlucien return false; 31829de7922bSDaniel Borkmann addr_param_seen = true; 31839de7922bSDaniel Borkmann break; 31846f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 31856f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 31866f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 31879de7922bSDaniel Borkmann /* In ASCONF chunks, these need to be first. */ 31889de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 31899de7922bSDaniel Borkmann return false; 31909de7922bSDaniel Borkmann length = ntohs(param.addip->param_hdr.length); 31919de7922bSDaniel Borkmann if (length < sizeof(sctp_addip_param_t) + 31926f4c618dSWei Yongjun sizeof(sctp_paramhdr_t)) 31939de7922bSDaniel Borkmann return false; 31946f4c618dSWei Yongjun break; 31956f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 31966f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 31976f4c618dSWei Yongjun if (length != sizeof(sctp_addip_param_t)) 31989de7922bSDaniel Borkmann return false; 31996f4c618dSWei Yongjun break; 32006f4c618dSWei Yongjun default: 32019de7922bSDaniel Borkmann /* This is unkown to us, reject! */ 32029de7922bSDaniel Borkmann return false; 32039de7922bSDaniel Borkmann } 32046f4c618dSWei Yongjun } 32056f4c618dSWei Yongjun 32069de7922bSDaniel Borkmann /* Remaining sanity checks. */ 32079de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 32089de7922bSDaniel Borkmann return false; 32099de7922bSDaniel Borkmann if (!addr_param_needed && addr_param_seen) 32109de7922bSDaniel Borkmann return false; 32119de7922bSDaniel Borkmann if (param.v != chunk->chunk_end) 32129de7922bSDaniel Borkmann return false; 32136f4c618dSWei Yongjun 32149de7922bSDaniel Borkmann return true; 32156f4c618dSWei Yongjun } 32166f4c618dSWei Yongjun 32171da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 32181da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 32191da177e4SLinus Torvalds */ 32201da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 32211da177e4SLinus Torvalds struct sctp_chunk *asconf) 32221da177e4SLinus Torvalds { 32239de7922bSDaniel Borkmann sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) asconf->chunk_hdr; 32249de7922bSDaniel Borkmann bool all_param_pass = true; 32259de7922bSDaniel Borkmann union sctp_params param; 32261da177e4SLinus Torvalds sctp_addiphdr_t *hdr; 32271da177e4SLinus Torvalds union sctp_addr_param *addr_param; 32281da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 32291da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 3230dbc16db1SAl Viro __be16 err_code; 32311da177e4SLinus Torvalds int length = 0; 3232f3830cccSWei Yongjun int chunk_len; 32331da177e4SLinus Torvalds __u32 serial; 32341da177e4SLinus Torvalds 3235f3830cccSWei Yongjun chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t); 32361da177e4SLinus Torvalds hdr = (sctp_addiphdr_t *)asconf->skb->data; 32371da177e4SLinus Torvalds serial = ntohl(hdr->serial); 32381da177e4SLinus Torvalds 32391da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 32401da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 32411da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 32421da177e4SLinus Torvalds chunk_len -= length; 32431da177e4SLinus Torvalds 32441da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 32457aa1b54bSJoe Perches * asconf parameter. 32461da177e4SLinus Torvalds */ 32476a435732SShan Wei length = ntohs(addr_param->p.length); 3248ea110733SJoe Perches asconf_param = (void *)addr_param + length; 32491da177e4SLinus Torvalds chunk_len -= length; 32501da177e4SLinus Torvalds 32511da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 32521da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 32532cab86beSWei Yongjun * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF 32547aa1b54bSJoe Perches * parameters. 32551da177e4SLinus Torvalds */ 32562cab86beSWei Yongjun asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); 32571da177e4SLinus Torvalds if (!asconf_ack) 32581da177e4SLinus Torvalds goto done; 32591da177e4SLinus Torvalds 32601da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 32619de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 32629de7922bSDaniel Borkmann /* Skip preceeding address parameters. */ 32639de7922bSDaniel Borkmann if (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 32649de7922bSDaniel Borkmann param.p->type == SCTP_PARAM_IPV6_ADDRESS) 32659de7922bSDaniel Borkmann continue; 32669de7922bSDaniel Borkmann 32671da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 32689de7922bSDaniel Borkmann param.addip); 32691da177e4SLinus Torvalds /* ADDIP 4.1 A7) 32701da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 32711da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 32721da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 32731da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 32741da177e4SLinus Torvalds * a specific success indication is present for the parameter. 32751da177e4SLinus Torvalds */ 32769de7922bSDaniel Borkmann if (err_code != SCTP_ERROR_NO_ERROR) 32779de7922bSDaniel Borkmann all_param_pass = false; 32781da177e4SLinus Torvalds if (!all_param_pass) 32799de7922bSDaniel Borkmann sctp_add_asconf_response(asconf_ack, param.addip->crr_id, 32809de7922bSDaniel Borkmann err_code, param.addip); 32811da177e4SLinus Torvalds 32821da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 32831da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 32841da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 32851da177e4SLinus Torvalds * in the ASCONF. 32861da177e4SLinus Torvalds */ 32879de7922bSDaniel Borkmann if (err_code == SCTP_ERROR_RSRC_LOW) 32881da177e4SLinus Torvalds goto done; 32891da177e4SLinus Torvalds } 32901da177e4SLinus Torvalds done: 32911da177e4SLinus Torvalds asoc->peer.addip_serial++; 32921da177e4SLinus Torvalds 32931da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 32941da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 32951da177e4SLinus Torvalds */ 32961da177e4SLinus Torvalds if (asconf_ack) { 32971da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3298a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3299a08de64dSVlad Yasevich &asoc->asconf_ack_list); 33001da177e4SLinus Torvalds } 33011da177e4SLinus Torvalds 33021da177e4SLinus Torvalds return asconf_ack; 33031da177e4SLinus Torvalds } 33041da177e4SLinus Torvalds 33051da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 3306425e0f68SWei Yongjun static void sctp_asconf_param_success(struct sctp_association *asoc, 33071da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 33081da177e4SLinus Torvalds { 33091da177e4SLinus Torvalds struct sctp_af *af; 33101da177e4SLinus Torvalds union sctp_addr addr; 33111da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 33121da177e4SLinus Torvalds union sctp_addr_param *addr_param; 33131da177e4SLinus Torvalds struct sctp_transport *transport; 3314dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 33151da177e4SLinus Torvalds 3316ea110733SJoe Perches addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); 33171da177e4SLinus Torvalds 33181da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 33196a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 3320dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 33211da177e4SLinus Torvalds 33221da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 33231da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3324559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3325559cf710SVlad Yasevich * held, so the list can not change. 3326559cf710SVlad Yasevich */ 33270ed90fb0SVlad Yasevich local_bh_disable(); 3328559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3329dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3330f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3331dc022a98SSridhar Samudrala } 33320ed90fb0SVlad Yasevich local_bh_enable(); 33333cd9749cSWei Yongjun list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33343cd9749cSWei Yongjun transports) { 33353cd9749cSWei Yongjun dst_release(transport->dst); 3336c6ef006bSVlad Yasevich transport->dst = NULL; 33373cd9749cSWei Yongjun } 33381da177e4SLinus Torvalds break; 33391da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 33400ed90fb0SVlad Yasevich local_bh_disable(); 3341425e0f68SWei Yongjun sctp_del_bind_addr(bp, &addr); 33428a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending != NULL && 33438a07eb0aSMichio Honda sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { 33448a07eb0aSMichio Honda kfree(asoc->asconf_addr_del_pending); 33458a07eb0aSMichio Honda asoc->asconf_addr_del_pending = NULL; 33468a07eb0aSMichio Honda } 33470ed90fb0SVlad Yasevich local_bh_enable(); 33489dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33499dbc15f0SRobert P. J. Day transports) { 3350dc022a98SSridhar Samudrala dst_release(transport->dst); 3351c6ef006bSVlad Yasevich transport->dst = NULL; 33521da177e4SLinus Torvalds } 33531da177e4SLinus Torvalds break; 33541da177e4SLinus Torvalds default: 33551da177e4SLinus Torvalds break; 33561da177e4SLinus Torvalds } 33571da177e4SLinus Torvalds } 33581da177e4SLinus Torvalds 33591da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 33601da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 33611da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 33621da177e4SLinus Torvalds * ADDIP 4.1 33631da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 33641da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 33651da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 33661da177e4SLinus Torvalds * specific success indication is present for the parameter. 33671da177e4SLinus Torvalds */ 3368dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 33691da177e4SLinus Torvalds sctp_addip_param_t *asconf_param, 33701da177e4SLinus Torvalds int no_err) 33711da177e4SLinus Torvalds { 33721da177e4SLinus Torvalds sctp_addip_param_t *asconf_ack_param; 33731da177e4SLinus Torvalds sctp_errhdr_t *err_param; 33741da177e4SLinus Torvalds int length; 3375f3830cccSWei Yongjun int asconf_ack_len; 3376dbc16db1SAl Viro __be16 err_code; 33771da177e4SLinus Torvalds 33781da177e4SLinus Torvalds if (no_err) 33791da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 33801da177e4SLinus Torvalds else 33811da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 33821da177e4SLinus Torvalds 3383f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3384f3830cccSWei Yongjun sizeof(sctp_chunkhdr_t); 3385f3830cccSWei Yongjun 33861da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 33871da177e4SLinus Torvalds * the first asconf_ack parameter. 33881da177e4SLinus Torvalds */ 33891da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 33901da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + 33911da177e4SLinus Torvalds length); 33921da177e4SLinus Torvalds asconf_ack_len -= length; 33931da177e4SLinus Torvalds 33941da177e4SLinus Torvalds while (asconf_ack_len > 0) { 33951da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 33961da177e4SLinus Torvalds switch (asconf_ack_param->param_hdr.type) { 33971da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 33981da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 33991da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 34001da177e4SLinus Torvalds length = sizeof(sctp_addip_param_t); 3401ea110733SJoe Perches err_param = (void *)asconf_ack_param + length; 34021da177e4SLinus Torvalds asconf_ack_len -= length; 34031da177e4SLinus Torvalds if (asconf_ack_len > 0) 34041da177e4SLinus Torvalds return err_param->cause; 34051da177e4SLinus Torvalds else 34061da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 34071da177e4SLinus Torvalds break; 34081da177e4SLinus Torvalds default: 34091da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 34101da177e4SLinus Torvalds } 34111da177e4SLinus Torvalds } 34121da177e4SLinus Torvalds 34131da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 3414ea110733SJoe Perches asconf_ack_param = (void *)asconf_ack_param + length; 34151da177e4SLinus Torvalds asconf_ack_len -= length; 34161da177e4SLinus Torvalds } 34171da177e4SLinus Torvalds 34181da177e4SLinus Torvalds return err_code; 34191da177e4SLinus Torvalds } 34201da177e4SLinus Torvalds 34211da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 34221da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 34231da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 34241da177e4SLinus Torvalds { 34251da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 34261da177e4SLinus Torvalds union sctp_addr_param *addr_param; 34271da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 34281da177e4SLinus Torvalds int length = 0; 34291da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 34301da177e4SLinus Torvalds int all_param_pass = 0; 34311da177e4SLinus Torvalds int no_err = 1; 34321da177e4SLinus Torvalds int retval = 0; 3433dbc16db1SAl Viro __be16 err_code = SCTP_ERROR_NO_ERROR; 34341da177e4SLinus Torvalds 34351da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 34361da177e4SLinus Torvalds * a pointer to address parameter. 34371da177e4SLinus Torvalds */ 34381da177e4SLinus Torvalds length = sizeof(sctp_addip_chunk_t); 34391da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 34401da177e4SLinus Torvalds asconf_len -= length; 34411da177e4SLinus Torvalds 34421da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 34437aa1b54bSJoe Perches * pointer to the first asconf parameter. 34441da177e4SLinus Torvalds */ 34456a435732SShan Wei length = ntohs(addr_param->p.length); 3446ea110733SJoe Perches asconf_param = (void *)addr_param + length; 34471da177e4SLinus Torvalds asconf_len -= length; 34481da177e4SLinus Torvalds 34491da177e4SLinus Torvalds /* ADDIP 4.1 34501da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 34511da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 34521da177e4SLinus Torvalds * successful. 34531da177e4SLinus Torvalds */ 34541da177e4SLinus Torvalds if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) 34551da177e4SLinus Torvalds all_param_pass = 1; 34561da177e4SLinus Torvalds 34571da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 34581da177e4SLinus Torvalds while (asconf_len > 0) { 34591da177e4SLinus Torvalds if (all_param_pass) 34601da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 34611da177e4SLinus Torvalds else { 34621da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 34631da177e4SLinus Torvalds asconf_param, 34641da177e4SLinus Torvalds no_err); 34651da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 34661da177e4SLinus Torvalds no_err = 0; 34671da177e4SLinus Torvalds } 34681da177e4SLinus Torvalds 34691da177e4SLinus Torvalds switch (err_code) { 34701da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 3471425e0f68SWei Yongjun sctp_asconf_param_success(asoc, asconf_param); 34721da177e4SLinus Torvalds break; 34731da177e4SLinus Torvalds 34741da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 34751da177e4SLinus Torvalds retval = 1; 34761da177e4SLinus Torvalds break; 34771da177e4SLinus Torvalds 3478a987f762SWei Yongjun case SCTP_ERROR_UNKNOWN_PARAM: 34791da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 34801da177e4SLinus Torvalds * future. 34811da177e4SLinus Torvalds */ 34821da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 34831da177e4SLinus Torvalds asconf_param->param_hdr.type; 34841da177e4SLinus Torvalds break; 34851da177e4SLinus Torvalds 34861da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 34871da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 34881da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 34891da177e4SLinus Torvalds default: 34901da177e4SLinus Torvalds break; 34911da177e4SLinus Torvalds } 34921da177e4SLinus Torvalds 34931da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 34941da177e4SLinus Torvalds * one. 34951da177e4SLinus Torvalds */ 34961da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3497ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 34981da177e4SLinus Torvalds asconf_len -= length; 34991da177e4SLinus Torvalds } 35001da177e4SLinus Torvalds 3501ddc4bbeeSMichio Honda if (no_err && asoc->src_out_of_asoc_ok) { 35028a07eb0aSMichio Honda asoc->src_out_of_asoc_ok = 0; 3503ddc4bbeeSMichio Honda sctp_transport_immediate_rtx(asoc->peer.primary_path); 3504ddc4bbeeSMichio Honda } 35058a07eb0aSMichio Honda 35061da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 35075f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 35081da177e4SLinus Torvalds sctp_chunk_free(asconf); 35091da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 35101da177e4SLinus Torvalds 35111da177e4SLinus Torvalds return retval; 35121da177e4SLinus Torvalds } 35131da177e4SLinus Torvalds 35141da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 35151da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 35161da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 35171da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 35181da177e4SLinus Torvalds { 35191da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 35201da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 35211da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 35221da177e4SLinus Torvalds size_t hint; 35231da177e4SLinus Torvalds int i; 35241da177e4SLinus Torvalds 35251da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 35261da177e4SLinus Torvalds 3527cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC); 35281da177e4SLinus Torvalds 35291da177e4SLinus Torvalds if (!retval) 35301da177e4SLinus Torvalds return NULL; 35311da177e4SLinus Torvalds 35321da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 35331da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 35341da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 35351da177e4SLinus Torvalds 35361da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 35371da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 35381da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 35391da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 35401da177e4SLinus Torvalds } 35411da177e4SLinus Torvalds 35421da177e4SLinus Torvalds return retval; 35431da177e4SLinus Torvalds } 3544