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); 72f48ef4c7SXin Long static struct sctp_cookie_param *sctp_pack_cookie( 73f48ef4c7SXin Long const struct sctp_endpoint *ep, 741da177e4SLinus Torvalds const struct sctp_association *asoc, 751da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 761da177e4SLinus Torvalds int *cookie_len, 771da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len); 781da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 791da177e4SLinus Torvalds union sctp_params param, 801da177e4SLinus Torvalds const union sctp_addr *peer_addr, 81dd0fc66fSAl Viro gfp_t gfp); 828ee4be37SVlad Yasevich static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 838ee4be37SVlad Yasevich const void *data); 846daaf0deSstephen hemminger static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len, 856daaf0deSstephen hemminger const void *data); 861da177e4SLinus Torvalds 87072017b4SVlad Yasevich /* Control chunk destructor */ 88072017b4SVlad Yasevich static void sctp_control_release_owner(struct sk_buff *skb) 89072017b4SVlad Yasevich { 90072017b4SVlad Yasevich /*TODO: do memory release */ 91072017b4SVlad Yasevich } 92072017b4SVlad Yasevich 93072017b4SVlad Yasevich static void sctp_control_set_owner_w(struct sctp_chunk *chunk) 94072017b4SVlad Yasevich { 95072017b4SVlad Yasevich struct sctp_association *asoc = chunk->asoc; 96072017b4SVlad Yasevich struct sk_buff *skb = chunk->skb; 97072017b4SVlad Yasevich 98072017b4SVlad Yasevich /* TODO: properly account for control chunks. 99072017b4SVlad Yasevich * To do it right we'll need: 100072017b4SVlad Yasevich * 1) endpoint if association isn't known. 101072017b4SVlad Yasevich * 2) proper memory accounting. 102072017b4SVlad Yasevich * 103072017b4SVlad Yasevich * For now don't do anything for now. 104072017b4SVlad Yasevich */ 105072017b4SVlad Yasevich skb->sk = asoc ? asoc->base.sk : NULL; 106072017b4SVlad Yasevich skb->destructor = sctp_control_release_owner; 107072017b4SVlad Yasevich } 108072017b4SVlad Yasevich 1091da177e4SLinus Torvalds /* What was the inbound interface for this chunk? */ 1101da177e4SLinus Torvalds int sctp_chunk_iif(const struct sctp_chunk *chunk) 1111da177e4SLinus Torvalds { 112e7487c86SMarcelo Ricardo Leitner struct sk_buff *skb = chunk->skb; 1131da177e4SLinus Torvalds 114e7487c86SMarcelo Ricardo Leitner return SCTP_INPUT_CB(skb)->af->skb_iif(skb); 1151da177e4SLinus Torvalds } 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 1181da177e4SLinus Torvalds * 1191da177e4SLinus Torvalds * Note 2: The ECN capable field is reserved for future use of 1201da177e4SLinus Torvalds * Explicit Congestion Notification. 1211da177e4SLinus Torvalds */ 1221da177e4SLinus Torvalds static const struct sctp_paramhdr ecap_param = { 1231da177e4SLinus Torvalds SCTP_PARAM_ECN_CAPABLE, 12409640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1251da177e4SLinus Torvalds }; 1261da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1271da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 12809640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1291da177e4SLinus Torvalds }; 1301da177e4SLinus Torvalds 1315fa782c2SNeil Horman /* A helper to initialize an op error inside a 1321da177e4SLinus Torvalds * provided chunk, as most cause codes will be embedded inside an 1331da177e4SLinus Torvalds * abort chunk. 1341da177e4SLinus Torvalds */ 1355bf2db03SAl Viro void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, 13600f1c2dfSWei Yongjun size_t paylen) 1371da177e4SLinus Torvalds { 138d8238d9dSXin Long struct sctp_errhdr err; 1391da177e4SLinus Torvalds __u16 len; 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds /* Cause code constants are now defined in network order. */ 1421da177e4SLinus Torvalds err.cause = cause_code; 143d8238d9dSXin Long len = sizeof(err) + paylen; 1441da177e4SLinus Torvalds err.length = htons(len); 145d8238d9dSXin Long chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(err), &err); 1461da177e4SLinus Torvalds } 1471da177e4SLinus Torvalds 1485fa782c2SNeil Horman /* A helper to initialize an op error inside a 1495fa782c2SNeil Horman * provided chunk, as most cause codes will be embedded inside an 1505fa782c2SNeil Horman * abort chunk. Differs from sctp_init_cause in that it won't oops 1515fa782c2SNeil Horman * if there isn't enough space in the op error chunk 1525fa782c2SNeil Horman */ 153db28aafaSIoan Orghici static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code, 1545fa782c2SNeil Horman size_t paylen) 1555fa782c2SNeil Horman { 156d8238d9dSXin Long struct sctp_errhdr err; 1575fa782c2SNeil Horman __u16 len; 1585fa782c2SNeil Horman 1595fa782c2SNeil Horman /* Cause code constants are now defined in network order. */ 1605fa782c2SNeil Horman err.cause = cause_code; 161d8238d9dSXin Long len = sizeof(err) + paylen; 1625fa782c2SNeil Horman err.length = htons(len); 1635fa782c2SNeil Horman 1642e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) < len) 1655fa782c2SNeil Horman return -ENOSPC; 166d8238d9dSXin Long 167d8238d9dSXin Long chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, sizeof(err), &err); 168d8238d9dSXin Long 1695fa782c2SNeil Horman return 0; 1705fa782c2SNeil Horman } 1711da177e4SLinus Torvalds /* 3.3.2 Initiation (INIT) (1) 1721da177e4SLinus Torvalds * 1731da177e4SLinus Torvalds * This chunk is used to initiate a SCTP association between two 1741da177e4SLinus Torvalds * endpoints. The format of the INIT chunk is shown below: 1751da177e4SLinus Torvalds * 1761da177e4SLinus Torvalds * 0 1 2 3 1771da177e4SLinus 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 1781da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1791da177e4SLinus Torvalds * | Type = 1 | Chunk Flags | Chunk Length | 1801da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1811da177e4SLinus Torvalds * | Initiate Tag | 1821da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1831da177e4SLinus Torvalds * | Advertised Receiver Window Credit (a_rwnd) | 1841da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1851da177e4SLinus Torvalds * | Number of Outbound Streams | Number of Inbound Streams | 1861da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1871da177e4SLinus Torvalds * | Initial TSN | 1881da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1891da177e4SLinus Torvalds * \ \ 1901da177e4SLinus Torvalds * / Optional/Variable-Length Parameters / 1911da177e4SLinus Torvalds * \ \ 1921da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1931da177e4SLinus Torvalds * 1941da177e4SLinus Torvalds * 1951da177e4SLinus Torvalds * The INIT chunk contains the following parameters. Unless otherwise 1961da177e4SLinus Torvalds * noted, each parameter MUST only be included once in the INIT chunk. 1971da177e4SLinus Torvalds * 1981da177e4SLinus Torvalds * Fixed Parameters Status 1991da177e4SLinus Torvalds * ---------------------------------------------- 2001da177e4SLinus Torvalds * Initiate Tag Mandatory 2011da177e4SLinus Torvalds * Advertised Receiver Window Credit Mandatory 2021da177e4SLinus Torvalds * Number of Outbound Streams Mandatory 2031da177e4SLinus Torvalds * Number of Inbound Streams Mandatory 2041da177e4SLinus Torvalds * Initial TSN Mandatory 2051da177e4SLinus Torvalds * 2061da177e4SLinus Torvalds * Variable Parameters Status Type Value 2071da177e4SLinus Torvalds * ------------------------------------------------------------- 2081da177e4SLinus Torvalds * IPv4 Address (Note 1) Optional 5 2091da177e4SLinus Torvalds * IPv6 Address (Note 1) Optional 6 2101da177e4SLinus Torvalds * Cookie Preservative Optional 9 2111da177e4SLinus Torvalds * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) 2121da177e4SLinus Torvalds * Host Name Address (Note 3) Optional 11 2131da177e4SLinus Torvalds * Supported Address Types (Note 4) Optional 12 2141da177e4SLinus Torvalds */ 2151da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, 2161da177e4SLinus Torvalds const struct sctp_bind_addr *bp, 217dd0fc66fSAl Viro gfp_t gfp, int vparam_len) 2181da177e4SLinus Torvalds { 219e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 220327c0dabSXin Long struct sctp_supported_ext_param ext_param; 221327c0dabSXin Long struct sctp_adaptation_ind_param aiparam; 222327c0dabSXin Long struct sctp_paramhdr *auth_chunks = NULL; 223327c0dabSXin Long struct sctp_paramhdr *auth_hmacs = NULL; 224327c0dabSXin Long struct sctp_supported_addrs_param sat; 225b14878ccSVlad Yasevich struct sctp_endpoint *ep = asoc->ep; 2261da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 2271da177e4SLinus Torvalds int num_types, addrs_len = 0; 228327c0dabSXin Long struct sctp_inithdr init; 229327c0dabSXin Long union sctp_params addrs; 2301da177e4SLinus Torvalds struct sctp_sock *sp; 23196b120b3SXin Long __u8 extensions[5]; 232327c0dabSXin Long size_t chunksize; 233327c0dabSXin Long __be16 types[2]; 234327c0dabSXin Long int num_ext = 0; 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2371da177e4SLinus Torvalds * 2381da177e4SLinus Torvalds * Note 1: The INIT chunks can contain multiple addresses that 2391da177e4SLinus Torvalds * can be IPv4 and/or IPv6 in any combination. 2401da177e4SLinus Torvalds */ 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds /* Convert the provided bind address list to raw format. */ 2431da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds init.init_tag = htonl(asoc->c.my_vtag); 2461da177e4SLinus Torvalds init.a_rwnd = htonl(asoc->rwnd); 2471da177e4SLinus Torvalds init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2481da177e4SLinus Torvalds init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2491da177e4SLinus Torvalds init.initial_tsn = htonl(asoc->c.initial_tsn); 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds /* How many address types are needed? */ 2521da177e4SLinus Torvalds sp = sctp_sk(asoc->base.sk); 2531da177e4SLinus Torvalds num_types = sp->pf->supported_addrs(sp, types); 2541da177e4SLinus Torvalds 255a8170c35SWei Yongjun chunksize = sizeof(init) + addrs_len; 256e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types)); 2571da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 2588ee4be37SVlad Yasevich 25928aa4c26SXin Long if (asoc->prsctp_enable) 260036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 261036b579bSVlad Yasevich 262131a47e3SVlad Yasevich /* ADDIP: Section 4.2.7: 263131a47e3SVlad Yasevich * An implementation supporting this extension [ADDIP] MUST list 264131a47e3SVlad Yasevich * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and 265131a47e3SVlad Yasevich * INIT-ACK parameters. 266131a47e3SVlad Yasevich */ 267e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) { 268131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 269131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 270131a47e3SVlad Yasevich num_ext += 2; 271131a47e3SVlad Yasevich } 272131a47e3SVlad Yasevich 273c28445c3SXin Long if (asoc->reconf_enable) { 274c28445c3SXin Long extensions[num_ext] = SCTP_CID_RECONF; 275c28445c3SXin Long num_ext += 1; 276c28445c3SXin Long } 277c28445c3SXin Long 2786fc791eeSmalc if (sp->adaptation_ind) 2791da177e4SLinus Torvalds chunksize += sizeof(aiparam); 2806fc791eeSmalc 28196b120b3SXin Long if (sp->strm_interleave) { 28296b120b3SXin Long extensions[num_ext] = SCTP_CID_I_DATA; 28396b120b3SXin Long num_ext += 1; 28496b120b3SXin Long } 28596b120b3SXin Long 2861da177e4SLinus Torvalds chunksize += vparam_len; 2871da177e4SLinus Torvalds 288730fc3d0SVlad Yasevich /* Account for AUTH related parameters */ 289b14878ccSVlad Yasevich if (ep->auth_enable) { 290730fc3d0SVlad Yasevich /* Add random parameter length*/ 291730fc3d0SVlad Yasevich chunksize += sizeof(asoc->c.auth_random); 292730fc3d0SVlad Yasevich 293730fc3d0SVlad Yasevich /* Add HMACS parameter length if any were defined */ 2943c918704SXin Long auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs; 295730fc3d0SVlad Yasevich if (auth_hmacs->length) 296e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); 297730fc3d0SVlad Yasevich else 298730fc3d0SVlad Yasevich auth_hmacs = NULL; 299730fc3d0SVlad Yasevich 300730fc3d0SVlad Yasevich /* Add CHUNKS parameter length */ 3013c918704SXin Long auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks; 302730fc3d0SVlad Yasevich if (auth_chunks->length) 303e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); 304730fc3d0SVlad Yasevich else 3059baffaa6SVlad Yasevich auth_chunks = NULL; 306730fc3d0SVlad Yasevich 307730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 308730fc3d0SVlad Yasevich num_ext += 1; 309730fc3d0SVlad Yasevich } 310730fc3d0SVlad Yasevich 311131a47e3SVlad Yasevich /* If we have any extensions to report, account for that */ 312131a47e3SVlad Yasevich if (num_ext) 31315328d9fSXin Long chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext); 314131a47e3SVlad Yasevich 3151da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3161da177e4SLinus Torvalds * 3171da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 3181da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 3191da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 3201da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 3211da177e4SLinus Torvalds * other address types if the Host Name address parameter is 3221da177e4SLinus Torvalds * present in the received INIT chunk. 3231da177e4SLinus Torvalds * 3241da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 3251da177e4SLinus Torvalds */ 3261da177e4SLinus Torvalds 327cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp); 3281da177e4SLinus Torvalds if (!retval) 3291da177e4SLinus Torvalds goto nodata; 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds retval->subh.init_hdr = 3321da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 3331da177e4SLinus Torvalds retval->param_hdr.v = 3341da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3371da177e4SLinus Torvalds * 3381da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 3391da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 3401da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 3411da177e4SLinus Torvalds * support any address type. 3421da177e4SLinus Torvalds */ 3431da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 3441da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 3451da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 3461da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 349131a47e3SVlad Yasevich 3507aa1b54bSJoe Perches /* Add the supported extensions parameter. Be nice and add this 351131a47e3SVlad Yasevich * fist before addiding the parameters for the extensions themselves 352131a47e3SVlad Yasevich */ 353131a47e3SVlad Yasevich if (num_ext) { 354131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 35515328d9fSXin Long ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext); 35615328d9fSXin Long sctp_addto_chunk(retval, sizeof(ext_param), &ext_param); 3578ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 358131a47e3SVlad Yasevich } 359131a47e3SVlad Yasevich 36028aa4c26SXin Long if (asoc->prsctp_enable) 3611da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 362131a47e3SVlad Yasevich 3636fc791eeSmalc if (sp->adaptation_ind) { 3640f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 3651da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3660f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sp->adaptation_ind); 3671da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 3686fc791eeSmalc } 369131a47e3SVlad Yasevich 370730fc3d0SVlad Yasevich /* Add SCTP-AUTH chunks to the parameter list */ 371b14878ccSVlad Yasevich if (ep->auth_enable) { 372730fc3d0SVlad Yasevich sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), 373730fc3d0SVlad Yasevich asoc->c.auth_random); 374730fc3d0SVlad Yasevich if (auth_hmacs) 375730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 376730fc3d0SVlad Yasevich auth_hmacs); 377730fc3d0SVlad Yasevich if (auth_chunks) 378730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 379730fc3d0SVlad Yasevich auth_chunks); 380730fc3d0SVlad Yasevich } 3811da177e4SLinus Torvalds nodata: 3821da177e4SLinus Torvalds kfree(addrs.v); 3831da177e4SLinus Torvalds return retval; 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 3871da177e4SLinus Torvalds const struct sctp_chunk *chunk, 388dd0fc66fSAl Viro gfp_t gfp, int unkparam_len) 3891da177e4SLinus Torvalds { 390327c0dabSXin Long struct sctp_supported_ext_param ext_param; 391327c0dabSXin Long struct sctp_adaptation_ind_param aiparam; 392327c0dabSXin Long struct sctp_paramhdr *auth_chunks = NULL; 393327c0dabSXin Long struct sctp_paramhdr *auth_random = NULL; 394327c0dabSXin Long struct sctp_paramhdr *auth_hmacs = NULL; 395327c0dabSXin Long struct sctp_chunk *retval = NULL; 396327c0dabSXin Long struct sctp_cookie_param *cookie; 3974ae70c08SXin Long struct sctp_inithdr initack; 3981da177e4SLinus Torvalds union sctp_params addrs; 3996fc791eeSmalc struct sctp_sock *sp; 40096b120b3SXin Long __u8 extensions[5]; 401327c0dabSXin Long size_t chunksize; 402327c0dabSXin Long int num_ext = 0; 403327c0dabSXin Long int cookie_len; 404327c0dabSXin Long int addrs_len; 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 4071da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 4101da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 4111da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 4121da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 4131da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 4161da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 4171da177e4SLinus Torvalds */ 4181da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 4191da177e4SLinus Torvalds addrs.v, addrs_len); 4201da177e4SLinus Torvalds if (!cookie) 4211da177e4SLinus Torvalds goto nomem_cookie; 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 4241da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 4251da177e4SLinus Torvalds */ 4266fc791eeSmalc sp = sctp_sk(asoc->base.sk); 4271da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 4301da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4311da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 4321da177e4SLinus Torvalds 4335ffad5acSWei Yongjun if (asoc->peer.prsctp_capable) 434036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 435036b579bSVlad Yasevich 4365ffad5acSWei Yongjun if (asoc->peer.asconf_capable) { 437131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 438131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 439131a47e3SVlad Yasevich num_ext += 2; 440131a47e3SVlad Yasevich } 441131a47e3SVlad Yasevich 442c28445c3SXin Long if (asoc->peer.reconf_capable) { 443c28445c3SXin Long extensions[num_ext] = SCTP_CID_RECONF; 444c28445c3SXin Long num_ext += 1; 445c28445c3SXin Long } 446c28445c3SXin Long 4476fc791eeSmalc if (sp->adaptation_ind) 4481da177e4SLinus Torvalds chunksize += sizeof(aiparam); 4491da177e4SLinus Torvalds 45096b120b3SXin Long if (asoc->intl_enable) { 45196b120b3SXin Long extensions[num_ext] = SCTP_CID_I_DATA; 45296b120b3SXin Long num_ext += 1; 45396b120b3SXin Long } 45496b120b3SXin Long 455730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 4563c918704SXin Long auth_random = (struct sctp_paramhdr *)asoc->c.auth_random; 457730fc3d0SVlad Yasevich chunksize += ntohs(auth_random->length); 458730fc3d0SVlad Yasevich 4593c918704SXin Long auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs; 460730fc3d0SVlad Yasevich if (auth_hmacs->length) 461e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); 462730fc3d0SVlad Yasevich else 463730fc3d0SVlad Yasevich auth_hmacs = NULL; 464730fc3d0SVlad Yasevich 4653c918704SXin Long auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks; 466730fc3d0SVlad Yasevich if (auth_chunks->length) 467e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); 468730fc3d0SVlad Yasevich else 469730fc3d0SVlad Yasevich auth_chunks = NULL; 470730fc3d0SVlad Yasevich 471730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 472730fc3d0SVlad Yasevich num_ext += 1; 473730fc3d0SVlad Yasevich } 474730fc3d0SVlad Yasevich 4758ee4be37SVlad Yasevich if (num_ext) 47615328d9fSXin Long chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext); 4778ee4be37SVlad Yasevich 4781da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 479cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp); 4801da177e4SLinus Torvalds if (!retval) 4811da177e4SLinus Torvalds goto nomem_chunk; 4821da177e4SLinus Torvalds 483b99a4d53SDan Carpenter /* RFC 2960 6.4 Multi-homed SCTP Endpoints 484b99a4d53SDan Carpenter * 485b99a4d53SDan Carpenter * An endpoint SHOULD transmit reply chunks (e.g., SACK, 486b99a4d53SDan Carpenter * HEARTBEAT ACK, * etc.) to the same destination transport 487b99a4d53SDan Carpenter * address from which it received the DATA or control chunk 488b99a4d53SDan Carpenter * to which it is replying. 489b99a4d53SDan Carpenter * 490b99a4d53SDan Carpenter * [INIT ACK back to where the INIT came from.] 4911da177e4SLinus Torvalds */ 4921da177e4SLinus Torvalds retval->transport = chunk->transport; 493b99a4d53SDan Carpenter 4941da177e4SLinus Torvalds retval->subh.init_hdr = 4951da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 4961da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 4971da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 4981da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4991da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 500131a47e3SVlad Yasevich if (num_ext) { 501131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 50215328d9fSXin Long ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext); 50315328d9fSXin Long sctp_addto_chunk(retval, sizeof(ext_param), &ext_param); 5048ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 505131a47e3SVlad Yasevich } 5061da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 5071da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 5081da177e4SLinus Torvalds 5096fc791eeSmalc if (sp->adaptation_ind) { 5100f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 5111da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 5126fc791eeSmalc aiparam.adaptation_ind = htonl(sp->adaptation_ind); 5131da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 5146fc791eeSmalc } 5151da177e4SLinus Torvalds 516730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 517730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_random->length), 518730fc3d0SVlad Yasevich auth_random); 519730fc3d0SVlad Yasevich if (auth_hmacs) 520730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 521730fc3d0SVlad Yasevich auth_hmacs); 522730fc3d0SVlad Yasevich if (auth_chunks) 523730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 524730fc3d0SVlad Yasevich auth_chunks); 525730fc3d0SVlad Yasevich } 526730fc3d0SVlad Yasevich 5271da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 5281da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds nomem_chunk: 5311da177e4SLinus Torvalds kfree(cookie); 5321da177e4SLinus Torvalds nomem_cookie: 5331da177e4SLinus Torvalds kfree(addrs.v); 5341da177e4SLinus Torvalds return retval; 5351da177e4SLinus Torvalds } 5361da177e4SLinus Torvalds 5371da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 5381da177e4SLinus Torvalds * 5391da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 5401da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 5411da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 5421da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 5431da177e4SLinus Torvalds * chunks in the same packet. 5441da177e4SLinus Torvalds * 5451da177e4SLinus Torvalds * 0 1 2 3 5461da177e4SLinus 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 5471da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5481da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 5491da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5501da177e4SLinus Torvalds * / Cookie / 5511da177e4SLinus Torvalds * \ \ 5521da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5531da177e4SLinus Torvalds * 5541da177e4SLinus Torvalds * Chunk Flags: 8 bit 5551da177e4SLinus Torvalds * 5561da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5571da177e4SLinus Torvalds * 5581da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 5591da177e4SLinus Torvalds * 5601da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 5611da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 5621da177e4SLinus Torvalds * 5631da177e4SLinus Torvalds * Cookie: variable size 5641da177e4SLinus Torvalds * 5651da177e4SLinus Torvalds * This field must contain the exact cookie received in the 5661da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 5671da177e4SLinus Torvalds * 5681da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 5691da177e4SLinus Torvalds * to insure interoperability. 5701da177e4SLinus Torvalds */ 5711da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 5721da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5731da177e4SLinus Torvalds { 5741da177e4SLinus Torvalds struct sctp_chunk *retval; 5751da177e4SLinus Torvalds int cookie_len; 576327c0dabSXin Long void *cookie; 5771da177e4SLinus Torvalds 5781da177e4SLinus Torvalds cookie = asoc->peer.cookie; 5791da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 582cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, 583cea8768fSMarcelo Ricardo Leitner cookie_len, GFP_ATOMIC); 5841da177e4SLinus Torvalds if (!retval) 5851da177e4SLinus Torvalds goto nodata; 5861da177e4SLinus Torvalds retval->subh.cookie_hdr = 5871da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5881da177e4SLinus Torvalds 5891da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5901da177e4SLinus Torvalds * 5911da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5921da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5931da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5941da177e4SLinus Torvalds * to which it is replying. 5951da177e4SLinus Torvalds * 5961da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 5971da177e4SLinus Torvalds */ 5981da177e4SLinus Torvalds if (chunk) 5991da177e4SLinus Torvalds retval->transport = chunk->transport; 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds nodata: 6021da177e4SLinus Torvalds return retval; 6031da177e4SLinus Torvalds } 6041da177e4SLinus Torvalds 6051da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 6061da177e4SLinus Torvalds * 6071da177e4SLinus Torvalds * This chunk is used only during the initialization of an 6081da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 6091da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 6101da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 6111da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 6121da177e4SLinus Torvalds * 6131da177e4SLinus Torvalds * 0 1 2 3 6141da177e4SLinus 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 6151da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6161da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 6171da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6181da177e4SLinus Torvalds * 6191da177e4SLinus Torvalds * Chunk Flags: 8 bits 6201da177e4SLinus Torvalds * 6211da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 6221da177e4SLinus Torvalds */ 6231da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 6241da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6251da177e4SLinus Torvalds { 6261da177e4SLinus Torvalds struct sctp_chunk *retval; 6271da177e4SLinus Torvalds 628cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC); 6291da177e4SLinus Torvalds 6301da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6311da177e4SLinus Torvalds * 6321da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6331da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6341da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6351da177e4SLinus Torvalds * to which it is replying. 6361da177e4SLinus Torvalds * 6371da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 6381da177e4SLinus Torvalds */ 6391da177e4SLinus Torvalds if (retval && chunk) 6401da177e4SLinus Torvalds retval->transport = chunk->transport; 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds return retval; 6431da177e4SLinus Torvalds } 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds /* 6461da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 6471da177e4SLinus Torvalds * CWR: 6481da177e4SLinus Torvalds * 6491da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 6501da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 6511da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 6521da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 6531da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 6541da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 6551da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 6561da177e4SLinus Torvalds * CE bit. 6571da177e4SLinus Torvalds * 6581da177e4SLinus Torvalds * 0 1 2 3 6591da177e4SLinus 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 6601da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6611da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 6621da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6631da177e4SLinus Torvalds * | Lowest TSN Number | 6641da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6651da177e4SLinus Torvalds * 6661da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 6671da177e4SLinus Torvalds */ 6681da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 6691da177e4SLinus Torvalds const __u32 lowest_tsn, 6701da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6711da177e4SLinus Torvalds { 6721da177e4SLinus Torvalds struct sctp_chunk *retval; 67365f77105SXin Long struct sctp_cwrhdr cwr; 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 676072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, 67765f77105SXin Long sizeof(cwr), GFP_ATOMIC); 6781da177e4SLinus Torvalds 6791da177e4SLinus Torvalds if (!retval) 6801da177e4SLinus Torvalds goto nodata; 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 6831da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6861da177e4SLinus Torvalds * 6871da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6881da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6891da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6901da177e4SLinus Torvalds * to which it is replying. 6911da177e4SLinus Torvalds * 6921da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 6931da177e4SLinus Torvalds * came from.] 6941da177e4SLinus Torvalds */ 6951da177e4SLinus Torvalds if (chunk) 6961da177e4SLinus Torvalds retval->transport = chunk->transport; 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds nodata: 6991da177e4SLinus Torvalds return retval; 7001da177e4SLinus Torvalds } 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 7031da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 7041da177e4SLinus Torvalds const __u32 lowest_tsn) 7051da177e4SLinus Torvalds { 7061da177e4SLinus Torvalds struct sctp_chunk *retval; 7071fb6d83bSXin Long struct sctp_ecnehdr ecne; 7081da177e4SLinus Torvalds 7091da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 710072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, 7111fb6d83bSXin Long sizeof(ecne), GFP_ATOMIC); 7121da177e4SLinus Torvalds if (!retval) 7131da177e4SLinus Torvalds goto nodata; 7141da177e4SLinus Torvalds retval->subh.ecne_hdr = 7151da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 7161da177e4SLinus Torvalds 7171da177e4SLinus Torvalds nodata: 7181da177e4SLinus Torvalds return retval; 7191da177e4SLinus Torvalds } 7201da177e4SLinus Torvalds 7211da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 7221da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 7231da177e4SLinus Torvalds */ 7240c3f6f65SXin Long struct sctp_chunk *sctp_make_datafrag_empty(const struct sctp_association *asoc, 7251da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 7260c3f6f65SXin Long int len, __u8 flags, gfp_t gfp) 7271da177e4SLinus Torvalds { 7281da177e4SLinus Torvalds struct sctp_chunk *retval; 7291da177e4SLinus Torvalds struct sctp_datahdr dp; 7301da177e4SLinus Torvalds 7311da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 7321da177e4SLinus Torvalds * creating the chunk. 7331da177e4SLinus Torvalds */ 7340c3f6f65SXin Long memset(&dp, 0, sizeof(dp)); 7351da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 7360c3f6f65SXin Long dp.stream = htons(sinfo->sinfo_stream); 7371da177e4SLinus Torvalds 7381da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 7390c3f6f65SXin Long if (sinfo->sinfo_flags & SCTP_UNORDERED) 7401da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 7411da177e4SLinus Torvalds 7420c3f6f65SXin Long retval = sctp_make_data(asoc, flags, sizeof(dp) + len, gfp); 7431da177e4SLinus Torvalds if (!retval) 7440c3f6f65SXin Long return NULL; 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 7471da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds return retval; 7501da177e4SLinus Torvalds } 7511da177e4SLinus Torvalds 7521da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 7531da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 7541da177e4SLinus Torvalds * including duplicates and gaps. 7551da177e4SLinus Torvalds */ 7561da177e4SLinus Torvalds struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) 7571da177e4SLinus Torvalds { 758327c0dabSXin Long struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 759327c0dabSXin Long struct sctp_association *aptr = (struct sctp_association *)asoc; 760327c0dabSXin Long struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; 761327c0dabSXin Long __u16 num_gabs, num_dup_tsns; 762327c0dabSXin Long struct sctp_transport *trans; 7631da177e4SLinus Torvalds struct sctp_chunk *retval; 7641da177e4SLinus Torvalds struct sctp_sackhdr sack; 7651da177e4SLinus Torvalds __u32 ctsn; 766327c0dabSXin Long int len; 7671da177e4SLinus Torvalds 76802015180SVlad Yasevich memset(gabs, 0, sizeof(gabs)); 7691da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 770bb33381dSDaniel Borkmann 771bb33381dSDaniel Borkmann pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn); 7721da177e4SLinus Torvalds 7731da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 77402015180SVlad Yasevich num_gabs = sctp_tsnmap_num_gabs(map, gabs); 7751da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds /* Initialize the SACK header. */ 7781da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 7791da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 7801da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 7811da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 7821da177e4SLinus Torvalds 7831da177e4SLinus Torvalds len = sizeof(sack) 7841da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 7851da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 7861da177e4SLinus Torvalds 7871da177e4SLinus Torvalds /* Create the chunk. */ 788cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC); 7891da177e4SLinus Torvalds if (!retval) 7901da177e4SLinus Torvalds goto nodata; 7911da177e4SLinus Torvalds 7921da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7931da177e4SLinus Torvalds * 7941da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 7951da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 7961da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 7971da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 7981da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 7991da177e4SLinus Torvalds * reply chunk. 8001da177e4SLinus Torvalds * 8011da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 8021da177e4SLinus Torvalds * in packets from different source addresses in a single 8031da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 8041da177e4SLinus Torvalds * destination transport addresses from which the DATA or 8051da177e4SLinus Torvalds * control chunks being acknowledged were received. 8061da177e4SLinus Torvalds * 8071da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 8081da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 8091da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 8101da177e4SLinus Torvalds * duplicates. --piggy] 8111da177e4SLinus Torvalds * 8121da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 8131da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 8141da177e4SLinus Torvalds * destination address and not use the source address of the 8151da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 8161da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 8171da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 8181da177e4SLinus Torvalds * for the SACK is broken. 8191da177e4SLinus Torvalds * 8201da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 8211da177e4SLinus Torvalds */ 8221da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 8231da177e4SLinus Torvalds 8241da177e4SLinus Torvalds retval->subh.sack_hdr = 8251da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 8261da177e4SLinus Torvalds 8271da177e4SLinus Torvalds /* Add the gap ack block information. */ 8281da177e4SLinus Torvalds if (num_gabs) 8291da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 83002015180SVlad Yasevich gabs); 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 833196d6759SMichele Baldessari if (num_dup_tsns) { 834196d6759SMichele Baldessari aptr->stats.idupchunks += num_dup_tsns; 8351da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 8361da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 837196d6759SMichele Baldessari } 8384244854dSNeil Horman /* Once we have a sack generated, check to see what our sack 8394244854dSNeil Horman * generation is, if its 0, reset the transports to 0, and reset 8404244854dSNeil Horman * the association generation to 1 8414244854dSNeil Horman * 8424244854dSNeil Horman * The idea is that zero is never used as a valid generation for the 8434244854dSNeil Horman * association so no transport will match after a wrap event like this, 8444244854dSNeil Horman * Until the next sack 8454244854dSNeil Horman */ 8464244854dSNeil Horman if (++aptr->peer.sack_generation == 0) { 8474244854dSNeil Horman list_for_each_entry(trans, &asoc->peer.transport_addr_list, 8484244854dSNeil Horman transports) 8494244854dSNeil Horman trans->sack_generation = 0; 8504244854dSNeil Horman aptr->peer.sack_generation = 1; 8514244854dSNeil Horman } 8521da177e4SLinus Torvalds nodata: 8531da177e4SLinus Torvalds return retval; 8541da177e4SLinus Torvalds } 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 8571da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 8581da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8591da177e4SLinus Torvalds { 860e61e4055SXin Long struct sctp_shutdownhdr shut; 8611da177e4SLinus Torvalds struct sctp_chunk *retval; 8621da177e4SLinus Torvalds __u32 ctsn; 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 8651da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 8661da177e4SLinus Torvalds 867072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, 868e61e4055SXin Long sizeof(shut), GFP_ATOMIC); 8691da177e4SLinus Torvalds if (!retval) 8701da177e4SLinus Torvalds goto nodata; 8711da177e4SLinus Torvalds 8721da177e4SLinus Torvalds retval->subh.shutdown_hdr = 8731da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 8741da177e4SLinus Torvalds 8751da177e4SLinus Torvalds if (chunk) 8761da177e4SLinus Torvalds retval->transport = chunk->transport; 8771da177e4SLinus Torvalds nodata: 8781da177e4SLinus Torvalds return retval; 8791da177e4SLinus Torvalds } 8801da177e4SLinus Torvalds 8811da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8821da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8831da177e4SLinus Torvalds { 8841da177e4SLinus Torvalds struct sctp_chunk *retval; 8851da177e4SLinus Torvalds 886cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0, 887cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8901da177e4SLinus Torvalds * 8911da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8921da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8931da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8941da177e4SLinus Torvalds * to which it is replying. 8951da177e4SLinus Torvalds * 8961da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 8971da177e4SLinus Torvalds */ 8981da177e4SLinus Torvalds if (retval && chunk) 8991da177e4SLinus Torvalds retval->transport = chunk->transport; 9001da177e4SLinus Torvalds 9011da177e4SLinus Torvalds return retval; 9021da177e4SLinus Torvalds } 9031da177e4SLinus Torvalds 9041da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 9051da177e4SLinus Torvalds const struct sctp_association *asoc, 9061da177e4SLinus Torvalds const struct sctp_chunk *chunk) 9071da177e4SLinus Torvalds { 9081da177e4SLinus Torvalds struct sctp_chunk *retval; 9091da177e4SLinus Torvalds __u8 flags = 0; 9101da177e4SLinus Torvalds 911047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 912047a2428SJerome Forissier * reflected) 913047a2428SJerome Forissier */ 9141da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 9151da177e4SLinus Torvalds 916cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 917cea8768fSMarcelo Ricardo Leitner 0, GFP_ATOMIC); 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9201da177e4SLinus Torvalds * 9211da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9221da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9231da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9241da177e4SLinus Torvalds * to which it is replying. 9251da177e4SLinus Torvalds * 9261da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 9271da177e4SLinus Torvalds * came from.] 9281da177e4SLinus Torvalds */ 9291da177e4SLinus Torvalds if (retval && chunk) 9301da177e4SLinus Torvalds retval->transport = chunk->transport; 9311da177e4SLinus Torvalds 9321da177e4SLinus Torvalds return retval; 9331da177e4SLinus Torvalds } 9341da177e4SLinus Torvalds 9351da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 936047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 9371da177e4SLinus Torvalds */ 9381da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 9391da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9401da177e4SLinus Torvalds const size_t hint) 9411da177e4SLinus Torvalds { 9421da177e4SLinus Torvalds struct sctp_chunk *retval; 9431da177e4SLinus Torvalds __u8 flags = 0; 9441da177e4SLinus Torvalds 945047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 946047a2428SJerome Forissier * an INIT (vtag will be reflected). 947047a2428SJerome Forissier */ 948047a2428SJerome Forissier if (!asoc) { 949047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 950047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 951047a2428SJerome Forissier flags = 0; 952047a2428SJerome Forissier else 953047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 954047a2428SJerome Forissier } 9551da177e4SLinus Torvalds 956cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint, 957cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 9581da177e4SLinus Torvalds 9591da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9601da177e4SLinus Torvalds * 9611da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9621da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9631da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9641da177e4SLinus Torvalds * to which it is replying. 9651da177e4SLinus Torvalds * 9661da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9671da177e4SLinus Torvalds */ 9681da177e4SLinus Torvalds if (retval && chunk) 9691da177e4SLinus Torvalds retval->transport = chunk->transport; 9701da177e4SLinus Torvalds 9711da177e4SLinus Torvalds return retval; 9721da177e4SLinus Torvalds } 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 9751da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 9761da177e4SLinus Torvalds const struct sctp_association *asoc, 977327c0dabSXin Long const struct sctp_chunk *chunk, 978327c0dabSXin Long __u32 tsn) 9791da177e4SLinus Torvalds { 9801da177e4SLinus Torvalds struct sctp_chunk *retval; 9819f81bcd9SAl Viro __be32 payload; 9821da177e4SLinus Torvalds 983d8238d9dSXin Long retval = sctp_make_abort(asoc, chunk, 984d8238d9dSXin Long sizeof(struct sctp_errhdr) + sizeof(tsn)); 9851da177e4SLinus Torvalds 9861da177e4SLinus Torvalds if (!retval) 9871da177e4SLinus Torvalds goto no_mem; 9881da177e4SLinus Torvalds 9891da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 9901da177e4SLinus Torvalds payload = htonl(tsn); 99100f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 99200f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 9931da177e4SLinus Torvalds 9941da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9951da177e4SLinus Torvalds * 9961da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9971da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9981da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9991da177e4SLinus Torvalds * to which it is replying. 10001da177e4SLinus Torvalds * 10011da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 10021da177e4SLinus Torvalds */ 10031da177e4SLinus Torvalds if (chunk) 10041da177e4SLinus Torvalds retval->transport = chunk->transport; 10051da177e4SLinus Torvalds 10061da177e4SLinus Torvalds no_mem: 10071da177e4SLinus Torvalds return retval; 10081da177e4SLinus Torvalds } 10091da177e4SLinus Torvalds 10101da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 10111da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 10126ce8e9ceSAl Viro struct msghdr *msg, 1013c164a9baSSridhar Samudrala size_t paylen) 10141da177e4SLinus Torvalds { 10151da177e4SLinus Torvalds struct sctp_chunk *retval; 1016c164a9baSSridhar Samudrala void *payload = NULL; 1017c164a9baSSridhar Samudrala int err; 10181da177e4SLinus Torvalds 1019d8238d9dSXin Long retval = sctp_make_abort(asoc, NULL, 1020d8238d9dSXin Long sizeof(struct sctp_errhdr) + paylen); 10211da177e4SLinus Torvalds if (!retval) 10221da177e4SLinus Torvalds goto err_chunk; 10231da177e4SLinus Torvalds 10241da177e4SLinus Torvalds if (paylen) { 10251da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 1026c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 10271da177e4SLinus Torvalds if (!payload) 10281da177e4SLinus Torvalds goto err_payload; 10291da177e4SLinus Torvalds 10306ce8e9ceSAl Viro err = memcpy_from_msg(payload, msg, paylen); 1031c164a9baSSridhar Samudrala if (err < 0) 10321da177e4SLinus Torvalds goto err_copy; 10331da177e4SLinus Torvalds } 10341da177e4SLinus Torvalds 103500f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 103600f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10371da177e4SLinus Torvalds 10381da177e4SLinus Torvalds if (paylen) 10391da177e4SLinus Torvalds kfree(payload); 10401da177e4SLinus Torvalds 10411da177e4SLinus Torvalds return retval; 10421da177e4SLinus Torvalds 10431da177e4SLinus Torvalds err_copy: 10441da177e4SLinus Torvalds kfree(payload); 10451da177e4SLinus Torvalds err_payload: 10461da177e4SLinus Torvalds sctp_chunk_free(retval); 10471da177e4SLinus Torvalds retval = NULL; 10481da177e4SLinus Torvalds err_chunk: 10491da177e4SLinus Torvalds return retval; 10501da177e4SLinus Torvalds } 10511da177e4SLinus Torvalds 10525c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 10535c94bf86SAdrian Bunk * enough. 10545c94bf86SAdrian Bunk */ 10555c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 10565c94bf86SAdrian Bunk const void *data) 10575c94bf86SAdrian Bunk { 10585c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 1059327c0dabSXin Long void *target; 10605c94bf86SAdrian Bunk 10615c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 10625c94bf86SAdrian Bunk 10636383cfb3SVlad Yasevich if (data) 10645c94bf86SAdrian Bunk memcpy(target, data, len); 10656383cfb3SVlad Yasevich else 10666383cfb3SVlad Yasevich memset(target, 0, len); 10675c94bf86SAdrian Bunk 10685c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 10695c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 10705c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 10715c94bf86SAdrian Bunk 10725c94bf86SAdrian Bunk return target; 10735c94bf86SAdrian Bunk } 10745c94bf86SAdrian Bunk 10751da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 10761da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 10771da177e4SLinus Torvalds const struct sctp_association *asoc, 10781da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10791da177e4SLinus Torvalds const __u8 *payload, 10801da177e4SLinus Torvalds const size_t paylen) 10811da177e4SLinus Torvalds { 10821da177e4SLinus Torvalds struct sctp_chunk *retval; 10831da177e4SLinus Torvalds struct sctp_paramhdr phdr; 10841da177e4SLinus Torvalds 1085d8238d9dSXin Long retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) + 1086d8238d9dSXin Long paylen + sizeof(phdr)); 10871da177e4SLinus Torvalds if (!retval) 10881da177e4SLinus Torvalds goto end; 10891da177e4SLinus Torvalds 10903c918704SXin Long sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen + 10913c918704SXin Long sizeof(phdr)); 10921da177e4SLinus Torvalds 10931da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 10941da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 109500f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10963c918704SXin Long sctp_addto_param(retval, sizeof(phdr), &phdr); 10971da177e4SLinus Torvalds 10981da177e4SLinus Torvalds end: 10991da177e4SLinus Torvalds return retval; 11001da177e4SLinus Torvalds } 11011da177e4SLinus Torvalds 1102ba016670SWei Yongjun struct sctp_chunk *sctp_make_violation_paramlen( 1103ba016670SWei Yongjun const struct sctp_association *asoc, 1104ba016670SWei Yongjun const struct sctp_chunk *chunk, 1105ba016670SWei Yongjun struct sctp_paramhdr *param) 1106ba016670SWei Yongjun { 1107ba016670SWei Yongjun static const char error[] = "The following parameter had invalid length:"; 1108d8238d9dSXin Long size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) + 11093c918704SXin Long sizeof(*param); 1110327c0dabSXin Long struct sctp_chunk *retval; 1111ba016670SWei Yongjun 1112ba016670SWei Yongjun retval = sctp_make_abort(asoc, chunk, payload_len); 1113ba016670SWei Yongjun if (!retval) 1114ba016670SWei Yongjun goto nodata; 1115ba016670SWei Yongjun 1116ba016670SWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, 11173c918704SXin Long sizeof(error) + sizeof(*param)); 1118ba016670SWei Yongjun sctp_addto_chunk(retval, sizeof(error), error); 11193c918704SXin Long sctp_addto_param(retval, sizeof(*param), param); 1120ba016670SWei Yongjun 1121ba016670SWei Yongjun nodata: 1122ba016670SWei Yongjun return retval; 1123ba016670SWei Yongjun } 1124ba016670SWei Yongjun 1125de4594a5SNeil Horman struct sctp_chunk *sctp_make_violation_max_retrans( 1126de4594a5SNeil Horman const struct sctp_association *asoc, 1127de4594a5SNeil Horman const struct sctp_chunk *chunk) 1128de4594a5SNeil Horman { 1129de4594a5SNeil Horman static const char error[] = "Association exceeded its max_retans count"; 1130d8238d9dSXin Long size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr); 1131327c0dabSXin Long struct sctp_chunk *retval; 1132de4594a5SNeil Horman 1133de4594a5SNeil Horman retval = sctp_make_abort(asoc, chunk, payload_len); 1134de4594a5SNeil Horman if (!retval) 1135de4594a5SNeil Horman goto nodata; 1136de4594a5SNeil Horman 1137de4594a5SNeil Horman sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); 1138de4594a5SNeil Horman sctp_addto_chunk(retval, sizeof(error), error); 1139de4594a5SNeil Horman 1140de4594a5SNeil Horman nodata: 1141de4594a5SNeil Horman return retval; 1142de4594a5SNeil Horman } 1143de4594a5SNeil Horman 11441da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 11451da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 114692c73af5SWei Yongjun const struct sctp_transport *transport) 11471da177e4SLinus Torvalds { 1148edf903f8SXin Long struct sctp_sender_hb_info hbinfo; 114992c73af5SWei Yongjun struct sctp_chunk *retval; 115092c73af5SWei Yongjun 1151cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, 1152cea8768fSMarcelo Ricardo Leitner sizeof(hbinfo), GFP_ATOMIC); 11531da177e4SLinus Torvalds 11541da177e4SLinus Torvalds if (!retval) 11551da177e4SLinus Torvalds goto nodata; 11561da177e4SLinus Torvalds 115792c73af5SWei Yongjun hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; 1158edf903f8SXin Long hbinfo.param_hdr.length = htons(sizeof(hbinfo)); 115992c73af5SWei Yongjun hbinfo.daddr = transport->ipaddr; 116092c73af5SWei Yongjun hbinfo.sent_at = jiffies; 116192c73af5SWei Yongjun hbinfo.hb_nonce = transport->hb_nonce; 116292c73af5SWei Yongjun 11631da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 11641da177e4SLinus Torvalds * what transport it belongs to. 11651da177e4SLinus Torvalds */ 11661da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 116792c73af5SWei Yongjun retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), 116892c73af5SWei Yongjun &hbinfo); 11691da177e4SLinus Torvalds 11701da177e4SLinus Torvalds nodata: 11711da177e4SLinus Torvalds return retval; 11721da177e4SLinus Torvalds } 11731da177e4SLinus Torvalds 11741da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 11751da177e4SLinus Torvalds const struct sctp_chunk *chunk, 1176327c0dabSXin Long const void *payload, 1177327c0dabSXin Long const size_t paylen) 11781da177e4SLinus Torvalds { 11791da177e4SLinus Torvalds struct sctp_chunk *retval; 11801da177e4SLinus Torvalds 1181cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen, 1182cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 11831da177e4SLinus Torvalds if (!retval) 11841da177e4SLinus Torvalds goto nodata; 11851da177e4SLinus Torvalds 11861da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 11871da177e4SLinus Torvalds 11881da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11891da177e4SLinus Torvalds * 11901da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11911da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 11921da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 11931da177e4SLinus Torvalds * to which it is replying. 11941da177e4SLinus Torvalds * 11951da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 11961da177e4SLinus Torvalds */ 11971da177e4SLinus Torvalds if (chunk) 11981da177e4SLinus Torvalds retval->transport = chunk->transport; 11991da177e4SLinus Torvalds 12001da177e4SLinus Torvalds nodata: 12011da177e4SLinus Torvalds return retval; 12021da177e4SLinus Torvalds } 12031da177e4SLinus Torvalds 12041da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 12051da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 12061da177e4SLinus Torvalds */ 12071da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 12081da177e4SLinus Torvalds const struct sctp_association *asoc, 12091da177e4SLinus Torvalds const struct sctp_chunk *chunk, 12101da177e4SLinus Torvalds size_t size) 12111da177e4SLinus Torvalds { 12121da177e4SLinus Torvalds struct sctp_chunk *retval; 12131da177e4SLinus Torvalds 1214072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, 1215d8238d9dSXin Long sizeof(struct sctp_errhdr) + size, 1216d8238d9dSXin Long GFP_ATOMIC); 12171da177e4SLinus Torvalds if (!retval) 12181da177e4SLinus Torvalds goto nodata; 12191da177e4SLinus Torvalds 12201da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 12211da177e4SLinus Torvalds * 12221da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 12231da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 12241da177e4SLinus Torvalds * address from which it received the DATA or control chunk 12251da177e4SLinus Torvalds * to which it is replying. 12261da177e4SLinus Torvalds * 12271da177e4SLinus Torvalds */ 12281da177e4SLinus Torvalds if (chunk) 12291da177e4SLinus Torvalds retval->transport = chunk->transport; 12301da177e4SLinus Torvalds 12311da177e4SLinus Torvalds nodata: 12321da177e4SLinus Torvalds return retval; 12331da177e4SLinus Torvalds } 12341da177e4SLinus Torvalds 12355fa782c2SNeil Horman /* Create an Operation Error chunk of a fixed size, 12365fa782c2SNeil Horman * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) 12375fa782c2SNeil Horman * This is a helper function to allocate an error chunk for 12385fa782c2SNeil Horman * for those invalid parameter codes in which we may not want 1239d82603c6SJorrit Schippers * to report all the errors, if the incoming chunk is large 12405fa782c2SNeil Horman */ 12415fa782c2SNeil Horman static inline struct sctp_chunk *sctp_make_op_error_fixed( 12425fa782c2SNeil Horman const struct sctp_association *asoc, 12435fa782c2SNeil Horman const struct sctp_chunk *chunk) 12445fa782c2SNeil Horman { 12455fa782c2SNeil Horman size_t size = asoc ? asoc->pathmtu : 0; 12465fa782c2SNeil Horman 12475fa782c2SNeil Horman if (!size) 12485fa782c2SNeil Horman size = SCTP_DEFAULT_MAXSEGMENT; 12495fa782c2SNeil Horman 12505fa782c2SNeil Horman return sctp_make_op_error_space(asoc, chunk, size); 12515fa782c2SNeil Horman } 12525fa782c2SNeil Horman 12531da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 12541da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 12551da177e4SLinus Torvalds const struct sctp_chunk *chunk, 125663706c5cSAl Viro __be16 cause_code, const void *payload, 12576383cfb3SVlad Yasevich size_t paylen, size_t reserve_tail) 12581da177e4SLinus Torvalds { 12591da177e4SLinus Torvalds struct sctp_chunk *retval; 12601da177e4SLinus Torvalds 12616383cfb3SVlad Yasevich retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); 12621da177e4SLinus Torvalds if (!retval) 12631da177e4SLinus Torvalds goto nodata; 12641da177e4SLinus Torvalds 12656383cfb3SVlad Yasevich sctp_init_cause(retval, cause_code, paylen + reserve_tail); 126600f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 12676383cfb3SVlad Yasevich if (reserve_tail) 12686383cfb3SVlad Yasevich sctp_addto_param(retval, reserve_tail, NULL); 12691da177e4SLinus Torvalds 12701da177e4SLinus Torvalds nodata: 12711da177e4SLinus Torvalds return retval; 12721da177e4SLinus Torvalds } 12731da177e4SLinus Torvalds 12744cd57c80SVlad Yasevich struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) 12754cd57c80SVlad Yasevich { 12764cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 1277327c0dabSXin Long struct sctp_hmac *hmac_desc; 1278327c0dabSXin Long struct sctp_chunk *retval; 12794cd57c80SVlad Yasevich 12804cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 12814cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 12824cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 12834cd57c80SVlad Yasevich return NULL; 12844cd57c80SVlad Yasevich 1285072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, 128696f7ef4dSXin Long hmac_desc->hmac_len + sizeof(auth_hdr), 1287cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 12884cd57c80SVlad Yasevich if (!retval) 12894cd57c80SVlad Yasevich return NULL; 12904cd57c80SVlad Yasevich 12914cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 12924cd57c80SVlad Yasevich auth_hdr.shkey_id = htons(asoc->active_key_id); 12934cd57c80SVlad Yasevich 129496f7ef4dSXin Long retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr), 12954cd57c80SVlad Yasevich &auth_hdr); 12964cd57c80SVlad Yasevich 1297594831a8SMarcelo Ricardo Leitner skb_put_zero(retval->skb, hmac_desc->hmac_len); 12984cd57c80SVlad Yasevich 12994cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 13004cd57c80SVlad Yasevich retval->chunk_hdr->length = 13014cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 13024cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 13034cd57c80SVlad Yasevich 13044cd57c80SVlad Yasevich return retval; 13054cd57c80SVlad Yasevich } 13064cd57c80SVlad Yasevich 13074cd57c80SVlad Yasevich 13081da177e4SLinus Torvalds /******************************************************************** 13091da177e4SLinus Torvalds * 2nd Level Abstractions 13101da177e4SLinus Torvalds ********************************************************************/ 13111da177e4SLinus Torvalds 13121da177e4SLinus Torvalds /* Turn an skb into a chunk. 13131da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 13143dc0a548Swangweidong * 13153dc0a548Swangweidong * sctpimpguide-05.txt Section 2.8.2 13163dc0a548Swangweidong * M1) Each time a new DATA chunk is transmitted 13173dc0a548Swangweidong * set the 'TSN.Missing.Report' count for that TSN to 0. The 13183dc0a548Swangweidong * 'TSN.Missing.Report' count will be used to determine missing chunks 13193dc0a548Swangweidong * and when to fast retransmit. 13203dc0a548Swangweidong * 13211da177e4SLinus Torvalds */ 13221da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 13231da177e4SLinus Torvalds const struct sctp_association *asoc, 1324cea8768fSMarcelo Ricardo Leitner struct sock *sk, gfp_t gfp) 13251da177e4SLinus Torvalds { 13261da177e4SLinus Torvalds struct sctp_chunk *retval; 13271da177e4SLinus Torvalds 1328cea8768fSMarcelo Ricardo Leitner retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp); 13291da177e4SLinus Torvalds 13301da177e4SLinus Torvalds if (!retval) 13311da177e4SLinus Torvalds goto nodata; 1332bb33381dSDaniel Borkmann if (!sk) 1333bb33381dSDaniel Borkmann pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); 13341da177e4SLinus Torvalds 133579af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 13361da177e4SLinus Torvalds retval->skb = skb; 13371da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 13381da177e4SLinus Torvalds retval->singleton = 1; 13391da177e4SLinus Torvalds 1340c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 13411da177e4SLinus Torvalds 13421da177e4SLinus Torvalds /* Polish the bead hole. */ 13431da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 13441da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 13451da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 1346e7f02796SReshetova, Elena refcount_set(&retval->refcnt, 1); 13471da177e4SLinus Torvalds 13481da177e4SLinus Torvalds nodata: 13491da177e4SLinus Torvalds return retval; 13501da177e4SLinus Torvalds } 13511da177e4SLinus Torvalds 13521da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 13531da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 13541da177e4SLinus Torvalds union sctp_addr *dest) 13551da177e4SLinus Torvalds { 1356f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 135716b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 13581da177e4SLinus Torvalds } 13591da177e4SLinus Torvalds 13601da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 13611da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 13621da177e4SLinus Torvalds { 13631da177e4SLinus Torvalds /* If we have a known transport, use that. */ 13641da177e4SLinus Torvalds if (chunk->transport) { 13656a1e5f33SAl Viro return &chunk->transport->ipaddr; 13661da177e4SLinus Torvalds } else { 13671da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 13686a1e5f33SAl Viro return &chunk->source; 13691da177e4SLinus Torvalds } 13701da177e4SLinus Torvalds } 13711da177e4SLinus Torvalds 13721da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 13731da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 13741da177e4SLinus Torvalds */ 1375072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 1376cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1377cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 13781da177e4SLinus Torvalds { 1379922dbc5bSXin Long struct sctp_chunkhdr *chunk_hdr; 1380327c0dabSXin Long struct sctp_chunk *retval; 13811da177e4SLinus Torvalds struct sk_buff *skb; 13821da177e4SLinus Torvalds struct sock *sk; 138307f2c7abSAlexey Kodanev int chunklen; 138407f2c7abSAlexey Kodanev 138507f2c7abSAlexey Kodanev chunklen = SCTP_PAD4(sizeof(*chunk_hdr) + paylen); 138607f2c7abSAlexey Kodanev if (chunklen > SCTP_MAX_CHUNK_LEN) 138707f2c7abSAlexey Kodanev goto nodata; 13881da177e4SLinus Torvalds 13891da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 139007f2c7abSAlexey Kodanev skb = alloc_skb(chunklen, gfp); 13911da177e4SLinus Torvalds if (!skb) 13921da177e4SLinus Torvalds goto nodata; 13931da177e4SLinus Torvalds 13941da177e4SLinus Torvalds /* Make room for the chunk header. */ 1395922dbc5bSXin Long chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr)); 13961da177e4SLinus Torvalds chunk_hdr->type = type; 13971da177e4SLinus Torvalds chunk_hdr->flags = flags; 1398922dbc5bSXin Long chunk_hdr->length = htons(sizeof(*chunk_hdr)); 13991da177e4SLinus Torvalds 14001da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 1401cea8768fSMarcelo Ricardo Leitner retval = sctp_chunkify(skb, asoc, sk, gfp); 14021da177e4SLinus Torvalds if (!retval) { 14031da177e4SLinus Torvalds kfree_skb(skb); 14041da177e4SLinus Torvalds goto nodata; 14051da177e4SLinus Torvalds } 14061da177e4SLinus Torvalds 14071da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 1408922dbc5bSXin Long retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr); 14091da177e4SLinus Torvalds 14104cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 14114cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 14124cd57c80SVlad Yasevich retval->auth = 1; 14134cd57c80SVlad Yasevich 14141da177e4SLinus Torvalds return retval; 14151da177e4SLinus Torvalds nodata: 14161da177e4SLinus Torvalds return NULL; 14171da177e4SLinus Torvalds } 14181da177e4SLinus Torvalds 1419072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 1420cea8768fSMarcelo Ricardo Leitner __u8 flags, int paylen, gfp_t gfp) 1421072017b4SVlad Yasevich { 1422cea8768fSMarcelo Ricardo Leitner return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp); 1423072017b4SVlad Yasevich } 1424072017b4SVlad Yasevich 1425ad05a7a0SXin Long struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc, 1426ad05a7a0SXin Long __u8 flags, int paylen, gfp_t gfp) 1427ad05a7a0SXin Long { 1428ad05a7a0SXin Long return _sctp_make_chunk(asoc, SCTP_CID_I_DATA, flags, paylen, gfp); 1429ad05a7a0SXin Long } 1430ad05a7a0SXin Long 1431072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 1432cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1433cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 1434072017b4SVlad Yasevich { 1435cea8768fSMarcelo Ricardo Leitner struct sctp_chunk *chunk; 1436072017b4SVlad Yasevich 1437cea8768fSMarcelo Ricardo Leitner chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp); 1438072017b4SVlad Yasevich if (chunk) 1439072017b4SVlad Yasevich sctp_control_set_owner_w(chunk); 1440072017b4SVlad Yasevich 1441072017b4SVlad Yasevich return chunk; 1442072017b4SVlad Yasevich } 14431da177e4SLinus Torvalds 14441da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 14451da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 14461da177e4SLinus Torvalds { 1447a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1448a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1449a08de64dSVlad Yasevich 1450c485658bSDaniel Borkmann consume_skb(chunk->skb); 1451c485658bSDaniel Borkmann consume_skb(chunk->auth_chunk); 14521da177e4SLinus Torvalds 14531da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 14541da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 14551da177e4SLinus Torvalds } 14561da177e4SLinus Torvalds 14571da177e4SLinus Torvalds /* Possibly, free the chunk. */ 14581da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 14591da177e4SLinus Torvalds { 14601da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 14611da177e4SLinus Torvalds if (chunk->msg) 14621da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 14631da177e4SLinus Torvalds 14641da177e4SLinus Torvalds sctp_chunk_put(chunk); 14651da177e4SLinus Torvalds } 14661da177e4SLinus Torvalds 14671da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 14681da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 14691da177e4SLinus Torvalds { 1470e7f02796SReshetova, Elena refcount_inc(&ch->refcnt); 14711da177e4SLinus Torvalds } 14721da177e4SLinus Torvalds 14731da177e4SLinus Torvalds /* Release a reference to the chunk. */ 14741da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 14751da177e4SLinus Torvalds { 1476e7f02796SReshetova, Elena if (refcount_dec_and_test(&ch->refcnt)) 14771da177e4SLinus Torvalds sctp_chunk_destroy(ch); 14781da177e4SLinus Torvalds } 14791da177e4SLinus Torvalds 14801da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 14811da177e4SLinus Torvalds * enough. 14821da177e4SLinus Torvalds */ 14831da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 14841da177e4SLinus Torvalds { 14851da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 1486e2f036a9SMarcelo Ricardo Leitner int padlen = SCTP_PAD4(chunklen) - chunklen; 1487327c0dabSXin Long void *target; 14881da177e4SLinus Torvalds 1489b952f4dfSyuan linyu skb_put_zero(chunk->skb, padlen); 149059ae1d12SJohannes Berg target = skb_put_data(chunk->skb, data, len); 14911da177e4SLinus Torvalds 14921da177e4SLinus Torvalds /* Adjust the chunk length field. */ 14931da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 149427a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 14951da177e4SLinus Torvalds 14961da177e4SLinus Torvalds return target; 14971da177e4SLinus Torvalds } 14981da177e4SLinus Torvalds 14995fa782c2SNeil Horman /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient 15005fa782c2SNeil Horman * space in the chunk 15015fa782c2SNeil Horman */ 15026daaf0deSstephen hemminger static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk, 15035fa782c2SNeil Horman int len, const void *data) 15045fa782c2SNeil Horman { 15052e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) >= len) 15065fa782c2SNeil Horman return sctp_addto_chunk(chunk, len, data); 15075fa782c2SNeil Horman else 15085fa782c2SNeil Horman return NULL; 15095fa782c2SNeil Horman } 15105fa782c2SNeil Horman 15111da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 15121da177e4SLinus Torvalds * chunk is not big enough. 15131da177e4SLinus Torvalds * Returns a kernel err value. 15141da177e4SLinus Torvalds */ 1515e0eb093eSAl Viro int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 1516e0eb093eSAl Viro struct iov_iter *from) 15171da177e4SLinus Torvalds { 1518e0eb093eSAl Viro void *target; 15191da177e4SLinus Torvalds 15201da177e4SLinus Torvalds /* Make room in chunk for data. */ 15211da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 15221da177e4SLinus Torvalds 15231da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 15243b6d4dbfSAl Viro if (!copy_from_iter_full(target, len, from)) 1525e0eb093eSAl Viro return -EFAULT; 15261da177e4SLinus Torvalds 15271da177e4SLinus Torvalds /* Adjust the chunk length field. */ 15281da177e4SLinus Torvalds chunk->chunk_hdr->length = 15291da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 153027a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 15311da177e4SLinus Torvalds 1532e0eb093eSAl Viro return 0; 15331da177e4SLinus Torvalds } 15341da177e4SLinus Torvalds 15351da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15361da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15371da177e4SLinus Torvalds */ 15381da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 15391da177e4SLinus Torvalds { 1540ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 1541327c0dabSXin Long struct sctp_chunk *lchunk; 1542327c0dabSXin Long struct sctp_datamsg *msg; 1543327c0dabSXin Long __u16 ssn, sid; 15441da177e4SLinus Torvalds 15451da177e4SLinus Torvalds if (chunk->has_ssn) 15461da177e4SLinus Torvalds return; 15471da177e4SLinus Torvalds 1548ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1549ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1550cee360abSXin Long stream = &chunk->asoc->stream; 1551ab3e5e7bSVlad Yasevich 1552ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1553ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1554ab3e5e7bSVlad Yasevich */ 1555ab3e5e7bSVlad Yasevich msg = chunk->msg; 1556ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1557ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 15581da177e4SLinus Torvalds ssn = 0; 15591da177e4SLinus Torvalds } else { 1560ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1561a8386317SXin Long ssn = sctp_ssn_next(stream, out, sid); 15621da177e4SLinus Torvalds else 1563a8386317SXin Long ssn = sctp_ssn_peek(stream, out, sid); 15641da177e4SLinus Torvalds } 15651da177e4SLinus Torvalds 1566ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1567ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1568ab3e5e7bSVlad Yasevich } 15691da177e4SLinus Torvalds } 15701da177e4SLinus Torvalds 15711da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15721da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15731da177e4SLinus Torvalds */ 15741da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 15751da177e4SLinus Torvalds { 15761da177e4SLinus Torvalds if (!chunk->has_tsn) { 15771da177e4SLinus Torvalds /* This is the last possible instant to 15781da177e4SLinus Torvalds * assign a TSN. 15791da177e4SLinus Torvalds */ 15801da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 15811da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 15821da177e4SLinus Torvalds chunk->has_tsn = 1; 15831da177e4SLinus Torvalds } 15841da177e4SLinus Torvalds } 15851da177e4SLinus Torvalds 15861da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 15871da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 15883182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1589dd0fc66fSAl Viro gfp_t gfp) 15901da177e4SLinus Torvalds { 15911da177e4SLinus Torvalds struct sctp_association *asoc; 15921c662018SXin Long enum sctp_scope scope; 15931da177e4SLinus Torvalds struct sk_buff *skb; 15941da177e4SLinus Torvalds 15951da177e4SLinus Torvalds /* Create the bare association. */ 15961da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 15971da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 15981da177e4SLinus Torvalds if (!asoc) 15991da177e4SLinus Torvalds goto nodata; 16001da177e4SLinus Torvalds asoc->temp = 1; 16011da177e4SLinus Torvalds skb = chunk->skb; 16021da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1603e7487c86SMarcelo Ricardo Leitner SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1); 1604e7487c86SMarcelo Ricardo Leitner 16051da177e4SLinus Torvalds nodata: 16061da177e4SLinus Torvalds return asoc; 16071da177e4SLinus Torvalds } 16081da177e4SLinus Torvalds 16091da177e4SLinus Torvalds /* Build a cookie representing asoc. 16101da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 16111da177e4SLinus Torvalds */ 1612f48ef4c7SXin Long static struct sctp_cookie_param *sctp_pack_cookie( 1613f48ef4c7SXin Long const struct sctp_endpoint *ep, 16141da177e4SLinus Torvalds const struct sctp_association *asoc, 16151da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 1616327c0dabSXin Long int *cookie_len, const __u8 *raw_addrs, 1617327c0dabSXin Long int addrs_len) 16181da177e4SLinus Torvalds { 16191da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 1620f48ef4c7SXin Long struct sctp_cookie_param *retval; 16211da177e4SLinus Torvalds int headersize, bodysize; 16221da177e4SLinus Torvalds 16239834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 16249834a2bbSVlad Yasevich * any padding. 16259834a2bbSVlad Yasevich */ 16263c918704SXin Long headersize = sizeof(struct sctp_paramhdr) + 16279834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 16289834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 16291da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 16301da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 16311da177e4SLinus Torvalds 16321da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 16331da177e4SLinus Torvalds * functions simpler to write. 16341da177e4SLinus Torvalds */ 16351da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 16361da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 16371da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 16381da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 16391da177e4SLinus Torvalds 16401da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 16411da177e4SLinus Torvalds * out on the network. 16421da177e4SLinus Torvalds */ 1643af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1644af997d8cSArnaldo Carvalho de Melo if (!retval) 1645af997d8cSArnaldo Carvalho de Melo goto nodata; 1646af997d8cSArnaldo Carvalho de Melo 16471da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 16481da177e4SLinus Torvalds 16491da177e4SLinus Torvalds /* Set up the parameter header. */ 16501da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 16511da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 16521da177e4SLinus Torvalds 16531da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 16541da177e4SLinus Torvalds cookie->c = asoc->c; 16551da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 16561da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 16571da177e4SLinus Torvalds 16581da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 16591da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 16601da177e4SLinus Torvalds 16610f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 16620f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 16631da177e4SLinus Torvalds 16641da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 166552db882fSDaniel Borkmann cookie->c.expiration = ktime_add(asoc->cookie_life, 1666cb5e173eSMarcelo Ricardo Leitner ktime_get_real()); 16671da177e4SLinus Torvalds 16681da177e4SLinus Torvalds /* Copy the peer's init packet. */ 16691da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 16701da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 16711da177e4SLinus Torvalds 16721da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 16731da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 16741da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 16751da177e4SLinus Torvalds 16761da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 16775821c769SHerbert Xu SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); 16785821c769SHerbert Xu int err; 16791b489e11SHerbert Xu 16801da177e4SLinus Torvalds /* Sign the message. */ 16815821c769SHerbert Xu desc->tfm = sctp_sk(ep->base.sk)->hmac; 16825821c769SHerbert Xu desc->flags = 0; 16831da177e4SLinus Torvalds 16845821c769SHerbert Xu err = crypto_shash_setkey(desc->tfm, ep->secret_key, 16855821c769SHerbert Xu sizeof(ep->secret_key)) ?: 16865821c769SHerbert Xu crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize, 16875821c769SHerbert Xu cookie->signature); 16885821c769SHerbert Xu shash_desc_zero(desc); 16895821c769SHerbert Xu if (err) 16901b489e11SHerbert Xu goto free_cookie; 16911da177e4SLinus Torvalds } 16921da177e4SLinus Torvalds 16931da177e4SLinus Torvalds return retval; 16941b489e11SHerbert Xu 16951b489e11SHerbert Xu free_cookie: 16961b489e11SHerbert Xu kfree(retval); 16971b489e11SHerbert Xu nodata: 16981b489e11SHerbert Xu *cookie_len = 0; 16991b489e11SHerbert Xu return NULL; 17001da177e4SLinus Torvalds } 17011da177e4SLinus Torvalds 17021da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 17031da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 17041da177e4SLinus Torvalds const struct sctp_endpoint *ep, 17051da177e4SLinus Torvalds const struct sctp_association *asoc, 1706dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 17071da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 17081da177e4SLinus Torvalds { 17091da177e4SLinus Torvalds struct sctp_association *retval = NULL; 17101da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1711327c0dabSXin Long struct sctp_signed_cookie *cookie; 17121da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 1713327c0dabSXin Long struct sctp_cookie *bear_cookie; 1714327c0dabSXin Long __u8 *digest = ep->digest; 1715327c0dabSXin Long enum sctp_scope scope; 1716327c0dabSXin Long unsigned int len; 171752db882fSDaniel Borkmann ktime_t kt; 17181da177e4SLinus Torvalds 17199834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 17209834a2bbSVlad Yasevich * any padding. 17219834a2bbSVlad Yasevich */ 1722922dbc5bSXin Long headersize = sizeof(struct sctp_chunkhdr) + 17239834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 17249834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 17251da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 17261da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 17271da177e4SLinus Torvalds 17281da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 17291da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 17301da177e4SLinus Torvalds * INIT chunk. 17311da177e4SLinus Torvalds */ 17321da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17331da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 17341da177e4SLinus Torvalds goto malformed; 17351da177e4SLinus Torvalds 17361da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 17371da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 17381da177e4SLinus Torvalds goto malformed; 17391da177e4SLinus Torvalds 17401da177e4SLinus Torvalds /* Process the cookie. */ 17411da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 17421da177e4SLinus Torvalds bear_cookie = &cookie->c; 17431da177e4SLinus Torvalds 17441da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 17451da177e4SLinus Torvalds goto no_hmac; 17461da177e4SLinus Torvalds 17471da177e4SLinus Torvalds /* Check the signature. */ 17485821c769SHerbert Xu { 17495821c769SHerbert Xu SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); 17505821c769SHerbert Xu int err; 17511da177e4SLinus Torvalds 17525821c769SHerbert Xu desc->tfm = sctp_sk(ep->base.sk)->hmac; 17535821c769SHerbert Xu desc->flags = 0; 17545821c769SHerbert Xu 17555821c769SHerbert Xu err = crypto_shash_setkey(desc->tfm, ep->secret_key, 17565821c769SHerbert Xu sizeof(ep->secret_key)) ?: 17575821c769SHerbert Xu crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize, 17585821c769SHerbert Xu digest); 17595821c769SHerbert Xu shash_desc_zero(desc); 17605821c769SHerbert Xu 17615821c769SHerbert Xu if (err) { 17621b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17631b489e11SHerbert Xu goto fail; 17641b489e11SHerbert Xu } 17655821c769SHerbert Xu } 17661da177e4SLinus Torvalds 17671da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 17681da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 17691da177e4SLinus Torvalds goto fail; 17701da177e4SLinus Torvalds } 17711da177e4SLinus Torvalds 17721da177e4SLinus Torvalds no_hmac: 17731da177e4SLinus Torvalds /* IG Section 2.35.2: 17741da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 17751da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 17761da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 17771da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 17781da177e4SLinus Torvalds * discarded, 17791da177e4SLinus Torvalds */ 17801da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 17811da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 17821da177e4SLinus Torvalds goto fail; 17831da177e4SLinus Torvalds } 17841da177e4SLinus Torvalds 17859b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 17861da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 17871da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 17881da177e4SLinus Torvalds goto fail; 17891da177e4SLinus Torvalds } 17901da177e4SLinus Torvalds 17911da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 17921da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 17931da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1794f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1795f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1796f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1797f236218bSVlad Yasevich * down the new association establishment instead of every packet. 17981da177e4SLinus Torvalds */ 1799f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 180052db882fSDaniel Borkmann kt = skb_get_ktime(skb); 1801f236218bSVlad Yasevich else 1802cb5e173eSMarcelo Ricardo Leitner kt = ktime_get_real(); 1803f236218bSVlad Yasevich 180467cb9366SDaniel Borkmann if (!asoc && ktime_before(bear_cookie->expiration, kt)) { 18051da177e4SLinus Torvalds /* 18061da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 18071da177e4SLinus Torvalds * 18081da177e4SLinus Torvalds * Cause of error 18091da177e4SLinus Torvalds * --------------- 18101da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 18111da177e4SLinus Torvalds * Cookie that has expired. 18121da177e4SLinus Torvalds */ 18131da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 18141da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18151da177e4SLinus Torvalds if (*errp) { 181652db882fSDaniel Borkmann suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); 181734bcca28SAl Viro __be32 n = htonl(usecs); 18181da177e4SLinus Torvalds 18191da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, 182000f1c2dfSWei Yongjun sizeof(n)); 182100f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(n), &n); 18221da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 18231da177e4SLinus Torvalds } else 18241da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18251da177e4SLinus Torvalds 18261da177e4SLinus Torvalds goto fail; 18271da177e4SLinus Torvalds } 18281da177e4SLinus Torvalds 18291da177e4SLinus Torvalds /* Make a new base association. */ 18301da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 18311da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 18321da177e4SLinus Torvalds if (!retval) { 18331da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18341da177e4SLinus Torvalds goto fail; 18351da177e4SLinus Torvalds } 18361da177e4SLinus Torvalds 18371da177e4SLinus Torvalds /* Set up our peer's port number. */ 18381da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 18391da177e4SLinus Torvalds 18401da177e4SLinus Torvalds /* Populate the association from the cookie. */ 18411da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 18421da177e4SLinus Torvalds 18431da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 18441da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 18451da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18461da177e4SLinus Torvalds goto fail; 18471da177e4SLinus Torvalds } 18481da177e4SLinus Torvalds 18491da177e4SLinus Torvalds /* Also, add the destination address. */ 18501da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1851f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1852133800d1SMarcelo Ricardo Leitner sizeof(chunk->dest), SCTP_ADDR_SRC, 1853133800d1SMarcelo Ricardo Leitner GFP_ATOMIC); 18541da177e4SLinus Torvalds } 18551da177e4SLinus Torvalds 18561da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 18571da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 18581da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 1859cc16f00fSXin Long retval->strreset_outseq = retval->c.initial_tsn; 18601da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 18611da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 18620f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 18631da177e4SLinus Torvalds 18641da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 18651da177e4SLinus Torvalds return retval; 18661da177e4SLinus Torvalds 18671da177e4SLinus Torvalds fail: 18681da177e4SLinus Torvalds if (retval) 18691da177e4SLinus Torvalds sctp_association_free(retval); 18701da177e4SLinus Torvalds 18711da177e4SLinus Torvalds return NULL; 18721da177e4SLinus Torvalds 18731da177e4SLinus Torvalds malformed: 18741da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 18751da177e4SLinus Torvalds * malformed. 18761da177e4SLinus Torvalds */ 18771da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 18781da177e4SLinus Torvalds goto fail; 18791da177e4SLinus Torvalds } 18801da177e4SLinus Torvalds 18811da177e4SLinus Torvalds /******************************************************************** 18821da177e4SLinus Torvalds * 3rd Level Abstractions 18831da177e4SLinus Torvalds ********************************************************************/ 18841da177e4SLinus Torvalds 18851da177e4SLinus Torvalds struct __sctp_missing { 18869f81bcd9SAl Viro __be32 num_missing; 18879f81bcd9SAl Viro __be16 type; 1888bc10502dSEric Dumazet } __packed; 18891da177e4SLinus Torvalds 18901da177e4SLinus Torvalds /* 18911da177e4SLinus Torvalds * Report a missing mandatory parameter. 18921da177e4SLinus Torvalds */ 18931da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 189434b4e29bSXin Long enum sctp_param paramtype, 18951da177e4SLinus Torvalds struct sctp_chunk *chunk, 18961da177e4SLinus Torvalds struct sctp_chunk **errp) 18971da177e4SLinus Torvalds { 18981da177e4SLinus Torvalds struct __sctp_missing report; 18991da177e4SLinus Torvalds __u16 len; 19001da177e4SLinus Torvalds 1901e2f036a9SMarcelo Ricardo Leitner len = SCTP_PAD4(sizeof(report)); 19021da177e4SLinus Torvalds 19031da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 19041da177e4SLinus Torvalds * returning multiple unknown parameters. 19051da177e4SLinus Torvalds */ 19061da177e4SLinus Torvalds if (!*errp) 19071da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19081da177e4SLinus Torvalds 19091da177e4SLinus Torvalds if (*errp) { 19101da177e4SLinus Torvalds report.num_missing = htonl(1); 19111da177e4SLinus Torvalds report.type = paramtype; 1912ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 191300f1c2dfSWei Yongjun sizeof(report)); 191400f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 19151da177e4SLinus Torvalds } 19161da177e4SLinus Torvalds 19171da177e4SLinus Torvalds /* Stop processing this chunk. */ 19181da177e4SLinus Torvalds return 0; 19191da177e4SLinus Torvalds } 19201da177e4SLinus Torvalds 19211da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 19221da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 19231da177e4SLinus Torvalds struct sctp_chunk *chunk, 19241da177e4SLinus Torvalds struct sctp_chunk **errp) 19251da177e4SLinus Torvalds { 19261da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 19271da177e4SLinus Torvalds 19281da177e4SLinus Torvalds if (!*errp) 19291da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 19301da177e4SLinus Torvalds 19311da177e4SLinus Torvalds if (*errp) 193200f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 19331da177e4SLinus Torvalds 19341da177e4SLinus Torvalds /* Stop processing this chunk. */ 19351da177e4SLinus Torvalds return 0; 19361da177e4SLinus Torvalds } 19371da177e4SLinus Torvalds 19381da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 19391da177e4SLinus Torvalds struct sctp_paramhdr *param, 19401da177e4SLinus Torvalds const struct sctp_chunk *chunk, 19411da177e4SLinus Torvalds struct sctp_chunk **errp) 19421da177e4SLinus Torvalds { 19437ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 19447ab90804SVlad Yasevich * not reported. 19457ab90804SVlad Yasevich */ 19467ab90804SVlad Yasevich if (*errp) 19477ab90804SVlad Yasevich sctp_chunk_free(*errp); 19487ab90804SVlad Yasevich 19491da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1950ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 19511da177e4SLinus Torvalds 19521da177e4SLinus Torvalds return 0; 19531da177e4SLinus Torvalds } 19541da177e4SLinus Torvalds 19551da177e4SLinus Torvalds 19561da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 19571da177e4SLinus Torvalds * send back an indicator to the peer. 19581da177e4SLinus Torvalds */ 19591da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 19601da177e4SLinus Torvalds union sctp_params param, 19611da177e4SLinus Torvalds struct sctp_chunk *chunk, 19621da177e4SLinus Torvalds struct sctp_chunk **errp) 19631da177e4SLinus Torvalds { 19641da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 19651da177e4SLinus Torvalds 19667ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 19677ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 19687ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 19697ab90804SVlad Yasevich * them in the ABORT. 19707ab90804SVlad Yasevich */ 19717ab90804SVlad Yasevich if (*errp) 19727ab90804SVlad Yasevich sctp_chunk_free(*errp); 19737ab90804SVlad Yasevich 19741da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19751da177e4SLinus Torvalds 197600f1c2dfSWei Yongjun if (*errp) { 197700f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); 197800f1c2dfSWei Yongjun sctp_addto_chunk(*errp, len, param.v); 197900f1c2dfSWei Yongjun } 19801da177e4SLinus Torvalds 19811da177e4SLinus Torvalds /* Stop processing this chunk. */ 19821da177e4SLinus Torvalds return 0; 19831da177e4SLinus Torvalds } 19841da177e4SLinus Torvalds 1985f53b5b09SEric W. Biederman static int sctp_verify_ext_param(struct net *net, union sctp_params param) 1986d6701191SVlad Yasevich { 19873c918704SXin Long __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 1988d6701191SVlad Yasevich int have_asconf = 0; 1989327c0dabSXin Long int have_auth = 0; 1990d6701191SVlad Yasevich int i; 1991d6701191SVlad Yasevich 1992d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 1993d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 1994d6701191SVlad Yasevich case SCTP_CID_AUTH: 1995d6701191SVlad Yasevich have_auth = 1; 1996d6701191SVlad Yasevich break; 1997d6701191SVlad Yasevich case SCTP_CID_ASCONF: 1998d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 1999d6701191SVlad Yasevich have_asconf = 1; 2000d6701191SVlad Yasevich break; 2001d6701191SVlad Yasevich } 2002d6701191SVlad Yasevich } 2003d6701191SVlad Yasevich 2004d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 2005d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 2006d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 2007d6701191SVlad Yasevich * mode. 2008d6701191SVlad Yasevich */ 2009e1fc3b14SEric W. Biederman if (net->sctp.addip_noauth) 2010d6701191SVlad Yasevich return 1; 2011d6701191SVlad Yasevich 2012e1fc3b14SEric W. Biederman if (net->sctp.addip_enable && !have_auth && have_asconf) 2013d6701191SVlad Yasevich return 0; 2014d6701191SVlad Yasevich 2015d6701191SVlad Yasevich return 1; 2016d6701191SVlad Yasevich } 2017d6701191SVlad Yasevich 2018131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 2019131a47e3SVlad Yasevich union sctp_params param) 2020131a47e3SVlad Yasevich { 20213c918704SXin Long __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 2022327c0dabSXin Long struct net *net = sock_net(asoc->base.sk); 2023131a47e3SVlad Yasevich int i; 2024131a47e3SVlad Yasevich 2025131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 2026131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 2027c28445c3SXin Long case SCTP_CID_RECONF: 2028c28445c3SXin Long if (asoc->reconf_enable && 2029c28445c3SXin Long !asoc->peer.reconf_capable) 2030c28445c3SXin Long asoc->peer.reconf_capable = 1; 2031c28445c3SXin Long break; 2032131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 203328aa4c26SXin Long if (asoc->prsctp_enable && !asoc->peer.prsctp_capable) 2034131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 2035131a47e3SVlad Yasevich break; 2036730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 2037730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 2038730fc3d0SVlad Yasevich * supports AUTH. 2039730fc3d0SVlad Yasevich */ 2040b14878ccSVlad Yasevich if (asoc->ep->auth_enable) 2041730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 2042730fc3d0SVlad Yasevich break; 2043131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 2044131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 2045e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 204688799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 20476b2f9cb6SVlad Yasevich break; 204896b120b3SXin Long case SCTP_CID_I_DATA: 204996b120b3SXin Long if (sctp_sk(asoc->base.sk)->strm_interleave) 205096b120b3SXin Long asoc->intl_enable = 1; 205196b120b3SXin Long break; 2052131a47e3SVlad Yasevich default: 2053131a47e3SVlad Yasevich break; 2054131a47e3SVlad Yasevich } 2055131a47e3SVlad Yasevich } 2056131a47e3SVlad Yasevich } 2057131a47e3SVlad Yasevich 20581da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 20591da177e4SLinus Torvalds * 20601da177e4SLinus Torvalds * The Parameter Types are encoded such that the 20611da177e4SLinus Torvalds * highest-order two bits specify the action that must be 20621da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 20631da177e4SLinus Torvalds * Parameter Type. 20641da177e4SLinus Torvalds * 20657ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 20667ab90804SVlad Yasevich * parameters within this chunk 20671da177e4SLinus Torvalds * 20687ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 20697ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 20707ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 20711da177e4SLinus Torvalds * 20721da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 20731da177e4SLinus Torvalds * 20741da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 20751da177e4SLinus Torvalds * report the unrecognized parameter in an 20767ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 20771da177e4SLinus Torvalds * 20781da177e4SLinus Torvalds * Return value: 20797ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20807ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 20817ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 20821da177e4SLinus Torvalds */ 20834785c7aeSXin Long static enum sctp_ierror sctp_process_unk_param( 20844785c7aeSXin Long const struct sctp_association *asoc, 20851da177e4SLinus Torvalds union sctp_params param, 20861da177e4SLinus Torvalds struct sctp_chunk *chunk, 20871da177e4SLinus Torvalds struct sctp_chunk **errp) 20881da177e4SLinus Torvalds { 20897ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 20901da177e4SLinus Torvalds 20911da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 20921da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 20937ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20941da177e4SLinus Torvalds break; 20951da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 20961da177e4SLinus Torvalds break; 20977ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 20987ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20997ab90804SVlad Yasevich /* Fall through */ 21001da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 21011da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 21021da177e4SLinus Torvalds * returning multiple unknown parameters. 21031da177e4SLinus Torvalds */ 21041da177e4SLinus Torvalds if (NULL == *errp) 21055fa782c2SNeil Horman *errp = sctp_make_op_error_fixed(asoc, chunk); 21061da177e4SLinus Torvalds 21071da177e4SLinus Torvalds if (*errp) { 21082205a6eaSJiri Bohac if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM, 2109e2f036a9SMarcelo Ricardo Leitner SCTP_PAD4(ntohs(param.p->length)))) 21105fa782c2SNeil Horman sctp_addto_chunk_fixed(*errp, 2111e2f036a9SMarcelo Ricardo Leitner SCTP_PAD4(ntohs(param.p->length)), 211200f1c2dfSWei Yongjun param.v); 21131da177e4SLinus Torvalds } else { 21141da177e4SLinus Torvalds /* If there is no memory for generating the ERROR 21151da177e4SLinus Torvalds * report as specified, an ABORT will be triggered 21161da177e4SLinus Torvalds * to the peer and the association won't be 21171da177e4SLinus Torvalds * established. 21181da177e4SLinus Torvalds */ 21197ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 21201da177e4SLinus Torvalds } 21211da177e4SLinus Torvalds break; 21221da177e4SLinus Torvalds default: 21231da177e4SLinus Torvalds break; 21241da177e4SLinus Torvalds } 21251da177e4SLinus Torvalds 21261da177e4SLinus Torvalds return retval; 21271da177e4SLinus Torvalds } 21281da177e4SLinus Torvalds 21297ab90804SVlad Yasevich /* Verify variable length parameters 21301da177e4SLinus Torvalds * Return values: 21317ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 21327ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 21337ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 21347ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 21351da177e4SLinus Torvalds */ 21364785c7aeSXin Long static enum sctp_ierror sctp_verify_param(struct net *net, 2137b14878ccSVlad Yasevich const struct sctp_endpoint *ep, 2138f53b5b09SEric W. Biederman const struct sctp_association *asoc, 21391da177e4SLinus Torvalds union sctp_params param, 21406d85e68fSXin Long enum sctp_cid cid, 21411da177e4SLinus Torvalds struct sctp_chunk *chunk, 21421da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 21431da177e4SLinus Torvalds { 214472da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 21457ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 214672da7b38SWei Yongjun __u16 n_elt, id = 0; 214772da7b38SWei Yongjun int i; 21481da177e4SLinus Torvalds 21491da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 21501da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 21511da177e4SLinus Torvalds * identified based on the chunk id. 21521da177e4SLinus Torvalds */ 21531da177e4SLinus Torvalds 21541da177e4SLinus Torvalds switch (param.p->type) { 21551da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 21561da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 21571da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 21581da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 21591da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 21601da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 21611da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 21621da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 21630f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2164d6701191SVlad Yasevich break; 2165d6701191SVlad Yasevich 2166131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2167f53b5b09SEric W. Biederman if (!sctp_verify_ext_param(net, param)) 2168d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 21691da177e4SLinus Torvalds break; 21701da177e4SLinus Torvalds 2171d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2172e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 2173d6de3097SVlad Yasevich break; 2174d6de3097SVlad Yasevich goto fallthrough; 2175d6de3097SVlad Yasevich 21761da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 21771da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 21787ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 21797ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21807ab90804SVlad Yasevich break; 2181131a47e3SVlad Yasevich 21821da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 218328aa4c26SXin Long if (ep->prsctp_enable) 21841da177e4SLinus Torvalds break; 2185730fc3d0SVlad Yasevich goto fallthrough; 2186730fc3d0SVlad Yasevich 2187730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2188b14878ccSVlad Yasevich if (!ep->auth_enable) 2189730fc3d0SVlad Yasevich goto fallthrough; 2190730fc3d0SVlad Yasevich 2191730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2192730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2193730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2194730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2195730fc3d0SVlad Yasevich */ 2196730fc3d0SVlad Yasevich if (SCTP_AUTH_RANDOM_LENGTH != 21973c918704SXin Long ntohs(param.p->length) - sizeof(struct sctp_paramhdr)) { 21987ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2199730fc3d0SVlad Yasevich chunk, err_chunk); 22007ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 22017ab90804SVlad Yasevich } 2202730fc3d0SVlad Yasevich break; 2203730fc3d0SVlad Yasevich 2204730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2205b14878ccSVlad Yasevich if (!ep->auth_enable) 2206730fc3d0SVlad Yasevich goto fallthrough; 2207730fc3d0SVlad Yasevich 2208730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2209730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2210730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2211730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2212730fc3d0SVlad Yasevich */ 22137ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 22147ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2215730fc3d0SVlad Yasevich chunk, err_chunk); 22167ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 22177ab90804SVlad Yasevich } 2218730fc3d0SVlad Yasevich break; 2219730fc3d0SVlad Yasevich 2220730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2221b14878ccSVlad Yasevich if (!ep->auth_enable) 222272da7b38SWei Yongjun goto fallthrough; 222372da7b38SWei Yongjun 222472da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 22253c918704SXin Long n_elt = (ntohs(param.p->length) - 22263c918704SXin Long sizeof(struct sctp_paramhdr)) >> 1; 222772da7b38SWei Yongjun 222872da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 222972da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 223072da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 223172da7b38SWei Yongjun */ 223272da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 223372da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 223472da7b38SWei Yongjun 223572da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2236730fc3d0SVlad Yasevich break; 223772da7b38SWei Yongjun } 223872da7b38SWei Yongjun 223972da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 224072da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 224172da7b38SWei Yongjun err_chunk); 224272da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 224372da7b38SWei Yongjun } 224472da7b38SWei Yongjun break; 2245730fc3d0SVlad Yasevich fallthrough: 22461da177e4SLinus Torvalds default: 2247bb33381dSDaniel Borkmann pr_debug("%s: unrecognized param:%d for chunk:%d\n", 2248bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), cid); 2249bb33381dSDaniel Borkmann 22507ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 22511da177e4SLinus Torvalds break; 22521da177e4SLinus Torvalds } 22531da177e4SLinus Torvalds return retval; 22541da177e4SLinus Torvalds } 22551da177e4SLinus Torvalds 22561da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 2257b14878ccSVlad Yasevich int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 22586d85e68fSXin Long const struct sctp_association *asoc, enum sctp_cid cid, 225901a992beSXin Long struct sctp_init_chunk *peer_init, 226001a992beSXin Long struct sctp_chunk *chunk, struct sctp_chunk **errp) 22611da177e4SLinus Torvalds { 22621da177e4SLinus Torvalds union sctp_params param; 22637613f5feSDaniel Borkmann bool has_cookie = false; 22647ab90804SVlad Yasevich int result; 22651da177e4SLinus Torvalds 22667613f5feSDaniel Borkmann /* Check for missing mandatory parameters. Note: Initial TSN is 22677613f5feSDaniel Borkmann * also mandatory, but is not checked here since the valid range 22687613f5feSDaniel Borkmann * is 0..2**32-1. RFC4960, section 3.3.3. 22697613f5feSDaniel Borkmann */ 22707613f5feSDaniel Borkmann if (peer_init->init_hdr.num_outbound_streams == 0 || 22717613f5feSDaniel Borkmann peer_init->init_hdr.num_inbound_streams == 0 || 22727613f5feSDaniel Borkmann peer_init->init_hdr.init_tag == 0 || 22737613f5feSDaniel Borkmann ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) 22747ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 22751da177e4SLinus Torvalds 22761da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22777613f5feSDaniel Borkmann if (param.p->type == SCTP_PARAM_STATE_COOKIE) 22787613f5feSDaniel Borkmann has_cookie = true; 22797613f5feSDaniel Borkmann } 22801da177e4SLinus Torvalds 22811da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 22821da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 22831da177e4SLinus Torvalds * The current param.p would point at the bad one. 22841da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 22851da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 22861da177e4SLinus Torvalds * error handling code build and send the packet. 22871da177e4SLinus Torvalds */ 22887ab90804SVlad Yasevich if (param.v != (void *)chunk->chunk_end) 22897ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 22901da177e4SLinus Torvalds 22911da177e4SLinus Torvalds /* The only missing mandatory param possible today is 22921da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 22931da177e4SLinus Torvalds */ 22947ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 22957ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 22961da177e4SLinus Torvalds chunk, errp); 22971da177e4SLinus Torvalds 22987ab90804SVlad Yasevich /* Verify all the variable length parameters */ 22991da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2300b14878ccSVlad Yasevich result = sctp_verify_param(net, ep, asoc, param, cid, 2301b14878ccSVlad Yasevich chunk, errp); 23027ab90804SVlad Yasevich switch (result) { 23037ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 23047ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 23051da177e4SLinus Torvalds return 0; 23067ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 23071da177e4SLinus Torvalds return 1; 23087ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 23097ab90804SVlad Yasevich default: 23107ab90804SVlad Yasevich break; 23111da177e4SLinus Torvalds } 23121da177e4SLinus Torvalds 23131da177e4SLinus Torvalds } /* for (loop through all parameters) */ 23141da177e4SLinus Torvalds 23151da177e4SLinus Torvalds return 1; 23161da177e4SLinus Torvalds } 23171da177e4SLinus Torvalds 23181da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 23191da177e4SLinus Torvalds * Returns 0 on failure, else success. 23201da177e4SLinus Torvalds * FIXME: This is an association method. 23211da177e4SLinus Torvalds */ 2322de6becdcSWei Yongjun int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, 23231da177e4SLinus Torvalds const union sctp_addr *peer_addr, 232401a992beSXin Long struct sctp_init_chunk *peer_init, gfp_t gfp) 23251da177e4SLinus Torvalds { 2326e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 23271da177e4SLinus Torvalds struct sctp_transport *transport; 23281da177e4SLinus Torvalds struct list_head *pos, *temp; 2329327c0dabSXin Long union sctp_params param; 2330de6becdcSWei Yongjun union sctp_addr addr; 2331327c0dabSXin Long struct sctp_af *af; 2332de6becdcSWei Yongjun int src_match = 0; 2333327c0dabSXin Long char *cookie; 23341da177e4SLinus Torvalds 23351da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 23361da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 23371da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 23381da177e4SLinus Torvalds * of the INIT from the cookie. 23391da177e4SLinus Torvalds */ 23401da177e4SLinus Torvalds 23411da177e4SLinus Torvalds /* This implementation defaults to making the first transport 23421da177e4SLinus Torvalds * added as the primary transport. The source address seems to 23431da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 23441da177e4SLinus Torvalds */ 23456a1e5f33SAl Viro if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 23461da177e4SLinus Torvalds goto nomem; 2347de6becdcSWei Yongjun 2348de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) 2349de6becdcSWei Yongjun src_match = 1; 23501da177e4SLinus Torvalds 23511da177e4SLinus Torvalds /* Process the initialization parameters. */ 23521da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2353de6becdcSWei Yongjun if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 2354de6becdcSWei Yongjun param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { 2355de6becdcSWei Yongjun af = sctp_get_af_specific(param_type2af(param.p->type)); 2356de6becdcSWei Yongjun af->from_addr_param(&addr, param.addr, 2357de6becdcSWei Yongjun chunk->sctp_hdr->source, 0); 2358de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) 2359de6becdcSWei Yongjun src_match = 1; 2360de6becdcSWei Yongjun } 23611da177e4SLinus Torvalds 23621da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 23631da177e4SLinus Torvalds goto clean_up; 23641da177e4SLinus Torvalds } 23651da177e4SLinus Torvalds 2366de6becdcSWei Yongjun /* source address of chunk may not match any valid address */ 2367de6becdcSWei Yongjun if (!src_match) 2368de6becdcSWei Yongjun goto clean_up; 2369de6becdcSWei Yongjun 2370730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2371730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2372730fc3d0SVlad Yasevich */ 2373730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2374730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2375730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2376730fc3d0SVlad Yasevich 2377d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2378d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2379d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2380d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2381d6701191SVlad Yasevich * is what we'll do here. 23826b2f9cb6SVlad Yasevich */ 2383e1fc3b14SEric W. Biederman if (!net->sctp.addip_noauth && 238473d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 23856b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 23866b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 23876b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 238888799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2389d6701191SVlad Yasevich goto clean_up; 23906b2f9cb6SVlad Yasevich } 23916b2f9cb6SVlad Yasevich 23923f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 23933f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 23943f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 23953f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 23963f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 23973f7a87d2SFrank Filz } 23983f7a87d2SFrank Filz } 23993f7a87d2SFrank Filz 24001da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 24011da177e4SLinus Torvalds * order. 24021da177e4SLinus Torvalds */ 24031da177e4SLinus Torvalds asoc->peer.i.init_tag = 24041da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 24051da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 24061da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 24071da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 24081da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 24091da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 24101da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 24111da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 24121da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 24131da177e4SLinus Torvalds 2414cc16f00fSXin Long asoc->strreset_inseq = asoc->peer.i.initial_tsn; 2415cc16f00fSXin Long 24161da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 24171da177e4SLinus Torvalds * number of inbound streams. 24181da177e4SLinus Torvalds */ 24191da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 24201da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 24211da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 24221da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 24231da177e4SLinus Torvalds } 24241da177e4SLinus Torvalds 24251da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 24261da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 24271da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 24281da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 24291da177e4SLinus Torvalds } 24301da177e4SLinus Torvalds 24311da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 24321da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 24331da177e4SLinus Torvalds 24341da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 24351da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 24361da177e4SLinus Torvalds 24371da177e4SLinus Torvalds /* Copy cookie in case we need to resend COOKIE-ECHO. */ 24381da177e4SLinus Torvalds cookie = asoc->peer.cookie; 24391da177e4SLinus Torvalds if (cookie) { 2440af997d8cSArnaldo Carvalho de Melo asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); 24411da177e4SLinus Torvalds if (!asoc->peer.cookie) 24421da177e4SLinus Torvalds goto clean_up; 24431da177e4SLinus Torvalds } 24441da177e4SLinus Torvalds 24451da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 24461da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 24471da177e4SLinus Torvalds * advertised window). 24481da177e4SLinus Torvalds */ 24499dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 24509dbc15f0SRobert P. J. Day transports) { 24511da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 24521da177e4SLinus Torvalds } 24531da177e4SLinus Torvalds 24541da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 24558e1ee18cSVlad Yasevich if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 24568e1ee18cSVlad Yasevich asoc->peer.i.initial_tsn, gfp)) 24578e1ee18cSVlad Yasevich goto clean_up; 24581da177e4SLinus Torvalds 24591da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 24601da177e4SLinus Torvalds * 24611da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 24621da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 24631da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 24641da177e4SLinus Torvalds * stream sequence number shall be set to 0. 24651da177e4SLinus Torvalds */ 24661da177e4SLinus Torvalds 2467ff356414SXin Long if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams, 2468ff356414SXin Long asoc->c.sinit_max_instreams, gfp)) 24691da177e4SLinus Torvalds goto clean_up; 24701da177e4SLinus Torvalds 24717e062977SXin Long if (!asoc->temp && sctp_assoc_set_id(asoc, gfp)) 24721da177e4SLinus Torvalds goto clean_up; 24731da177e4SLinus Torvalds 24741da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 24751da177e4SLinus Torvalds * 24761da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 24771da177e4SLinus Torvalds * remote endpoint it should do the following: 24781da177e4SLinus Torvalds * ... 24791da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 24801da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 24811da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 24821da177e4SLinus Torvalds * association to the same value as the Initial TSN. 24831da177e4SLinus Torvalds */ 24841da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 24851da177e4SLinus Torvalds return 1; 24861da177e4SLinus Torvalds 24871da177e4SLinus Torvalds clean_up: 24881da177e4SLinus Torvalds /* Release the transport structures. */ 24891da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 24901da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2491add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2492add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 24931da177e4SLinus Torvalds } 24943f7a87d2SFrank Filz 24951da177e4SLinus Torvalds nomem: 24961da177e4SLinus Torvalds return 0; 24971da177e4SLinus Torvalds } 24981da177e4SLinus Torvalds 24991da177e4SLinus Torvalds 25001da177e4SLinus Torvalds /* Update asoc with the option described in param. 25011da177e4SLinus Torvalds * 25021da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 25031da177e4SLinus Torvalds * 25041da177e4SLinus Torvalds * asoc is the association to update. 25051da177e4SLinus Torvalds * param is the variable length parameter to use for update. 25061da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 25071da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 25081da177e4SLinus Torvalds * work we do. In particular, we should not build transport 25091da177e4SLinus Torvalds * structures for the addresses. 25101da177e4SLinus Torvalds */ 25111da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 25121da177e4SLinus Torvalds union sctp_params param, 25131da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2514dd0fc66fSAl Viro gfp_t gfp) 25151da177e4SLinus Torvalds { 2516e7ff4a70SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 2517327c0dabSXin Long struct sctp_endpoint *ep = asoc->ep; 2518d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 2519d6de3097SVlad Yasevich struct sctp_transport *t; 2520327c0dabSXin Long enum sctp_scope scope; 2521327c0dabSXin Long union sctp_addr addr; 2522327c0dabSXin Long struct sctp_af *af; 2523327c0dabSXin Long int retval = 1, i; 2524327c0dabSXin Long u32 stale; 2525327c0dabSXin Long __u16 sat; 25261da177e4SLinus Torvalds 25271da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 25281da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 25291da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 25301da177e4SLinus Torvalds */ 25311da177e4SLinus Torvalds switch (param.p->type) { 25321da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25331da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 25341da177e4SLinus Torvalds break; 25357dab83deSVlad Yasevich goto do_addr_param; 25367dab83deSVlad Yasevich 25371da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25387dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 25397dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 25407dab83deSVlad Yasevich break; 25417dab83deSVlad Yasevich do_addr_param: 25421da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2543dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 25441da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2545e7ff4a70SEric W. Biederman if (sctp_in_scope(net, &addr, scope)) 2546dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 25471da177e4SLinus Torvalds return 0; 25481da177e4SLinus Torvalds break; 25491da177e4SLinus Torvalds 25501da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 2551e1fc3b14SEric W. Biederman if (!net->sctp.cookie_preserve_enable) 25521da177e4SLinus Torvalds break; 25531da177e4SLinus Torvalds 25541da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 25551da177e4SLinus Torvalds 25561da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 25571da177e4SLinus Torvalds * (1/1000sec). 25581da177e4SLinus Torvalds */ 255952db882fSDaniel Borkmann asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); 25601da177e4SLinus Torvalds break; 25611da177e4SLinus Torvalds 25621da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 2563bb33381dSDaniel Borkmann pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); 25641da177e4SLinus Torvalds break; 25651da177e4SLinus Torvalds 25661da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 25671da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 25681da177e4SLinus Torvalds * ones are really set by the peer. 25691da177e4SLinus Torvalds */ 25701da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 25711da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 25721da177e4SLinus Torvalds 2573140ee960SGui Jianfeng /* Assume that peer supports the address family 2574140ee960SGui Jianfeng * by which it sends a packet. 2575140ee960SGui Jianfeng */ 2576140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2577140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2578140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2579140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2580140ee960SGui Jianfeng 25811da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 25823c918704SXin Long sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 25831da177e4SLinus Torvalds if (sat) 25841da177e4SLinus Torvalds sat /= sizeof(__u16); 25851da177e4SLinus Torvalds 25861da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 25871da177e4SLinus Torvalds switch (param.sat->types[i]) { 25881da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25891da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 25901da177e4SLinus Torvalds break; 25911da177e4SLinus Torvalds 25921da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25936e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 25941da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 25951da177e4SLinus Torvalds break; 25961da177e4SLinus Torvalds 25971da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 25981da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 25991da177e4SLinus Torvalds break; 26001da177e4SLinus Torvalds 26011da177e4SLinus Torvalds default: /* Just ignore anything else. */ 26021da177e4SLinus Torvalds break; 26033ff50b79SStephen Hemminger } 26041da177e4SLinus Torvalds } 26051da177e4SLinus Torvalds break; 26061da177e4SLinus Torvalds 26071da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 26081da177e4SLinus Torvalds asoc->peer.cookie_len = 26093c918704SXin Long ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 26101da177e4SLinus Torvalds asoc->peer.cookie = param.cookie->body; 26111da177e4SLinus Torvalds break; 26121da177e4SLinus Torvalds 26131da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 26141da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 26151da177e4SLinus Torvalds break; 26161da177e4SLinus Torvalds 26171da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 26181da177e4SLinus Torvalds /* Rejected during verify stage. */ 26191da177e4SLinus Torvalds break; 26201da177e4SLinus Torvalds 26211da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 26221da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 26231da177e4SLinus Torvalds break; 26241da177e4SLinus Torvalds 26250f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2626e69c4e0fSVlad Yasevich asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); 26271da177e4SLinus Torvalds break; 26281da177e4SLinus Torvalds 2629d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2630e1fc3b14SEric W. Biederman if (!net->sctp.addip_enable) 26310ef46e28SVlad Yasevich goto fall_through; 26320ef46e28SVlad Yasevich 26338b32f234SXin Long addr_param = param.v + sizeof(struct sctp_addip_param); 2634d6de3097SVlad Yasevich 2635cfbf654eSSaran Maruti Ramanara af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 2636e40607cbSDaniel Borkmann if (af == NULL) 2637e40607cbSDaniel Borkmann break; 2638e40607cbSDaniel Borkmann 2639d6de3097SVlad Yasevich af->from_addr_param(&addr, addr_param, 2640d6de3097SVlad Yasevich htons(asoc->peer.port), 0); 2641d6de3097SVlad Yasevich 2642d6de3097SVlad Yasevich /* if the address is invalid, we can't process it. 2643d6de3097SVlad Yasevich * XXX: see spec for what to do. 2644d6de3097SVlad Yasevich */ 2645d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2646d6de3097SVlad Yasevich break; 2647d6de3097SVlad Yasevich 2648d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2649d6de3097SVlad Yasevich if (!t) 2650d6de3097SVlad Yasevich break; 2651d6de3097SVlad Yasevich 2652d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2653d6de3097SVlad Yasevich break; 2654d6de3097SVlad Yasevich 2655131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2656131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2657131a47e3SVlad Yasevich break; 2658131a47e3SVlad Yasevich 26591da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 266028aa4c26SXin Long if (asoc->prsctp_enable) { 26611da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 26621da177e4SLinus Torvalds break; 26631da177e4SLinus Torvalds } 26641da177e4SLinus Torvalds /* Fall Through */ 2665730fc3d0SVlad Yasevich goto fall_through; 2666730fc3d0SVlad Yasevich 2667730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2668b14878ccSVlad Yasevich if (!ep->auth_enable) 2669730fc3d0SVlad Yasevich goto fall_through; 2670730fc3d0SVlad Yasevich 2671730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2672730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2673730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2674730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2675730fc3d0SVlad Yasevich retval = 0; 2676730fc3d0SVlad Yasevich break; 2677730fc3d0SVlad Yasevich } 2678730fc3d0SVlad Yasevich break; 2679730fc3d0SVlad Yasevich 2680730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2681b14878ccSVlad Yasevich if (!ep->auth_enable) 2682730fc3d0SVlad Yasevich goto fall_through; 2683730fc3d0SVlad Yasevich 2684730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2685730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2686730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2687730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2688730fc3d0SVlad Yasevich retval = 0; 2689730fc3d0SVlad Yasevich break; 2690730fc3d0SVlad Yasevich } 2691730fc3d0SVlad Yasevich 2692730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2693730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2694730fc3d0SVlad Yasevich break; 2695730fc3d0SVlad Yasevich 2696730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2697b14878ccSVlad Yasevich if (!ep->auth_enable) 2698730fc3d0SVlad Yasevich goto fall_through; 2699730fc3d0SVlad Yasevich 2700730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2701730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2702730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2703730fc3d0SVlad Yasevich retval = 0; 2704730fc3d0SVlad Yasevich break; 2705730fc3d0SVlad Yasevich fall_through: 27061da177e4SLinus Torvalds default: 27071da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 27081da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 27091da177e4SLinus Torvalds * called prior to this routine. Simply log the error 27101da177e4SLinus Torvalds * here. 27111da177e4SLinus Torvalds */ 2712bb33381dSDaniel Borkmann pr_debug("%s: ignoring param:%d for association:%p.\n", 2713bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), asoc); 27141da177e4SLinus Torvalds break; 27153ff50b79SStephen Hemminger } 27161da177e4SLinus Torvalds 27171da177e4SLinus Torvalds return retval; 27181da177e4SLinus Torvalds } 27191da177e4SLinus Torvalds 27201da177e4SLinus Torvalds /* Select a new verification tag. */ 27211da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 27221da177e4SLinus Torvalds { 27231da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 27241da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 27251da177e4SLinus Torvalds */ 27261da177e4SLinus Torvalds __u32 x; 27271da177e4SLinus Torvalds 27281da177e4SLinus Torvalds do { 27291da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 27301da177e4SLinus Torvalds } while (x == 0); 27311da177e4SLinus Torvalds 27321da177e4SLinus Torvalds return x; 27331da177e4SLinus Torvalds } 27341da177e4SLinus Torvalds 27351da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 27361da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 27371da177e4SLinus Torvalds { 27381da177e4SLinus Torvalds __u32 retval; 27391da177e4SLinus Torvalds 27401da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 27411da177e4SLinus Torvalds return retval; 27421da177e4SLinus Torvalds } 27431da177e4SLinus Torvalds 27441da177e4SLinus Torvalds /* 27451da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 27461da177e4SLinus Torvalds * 0 1 2 3 27471da177e4SLinus 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 27481da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27491da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 27501da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27511da177e4SLinus Torvalds * | Serial Number | 27521da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27531da177e4SLinus Torvalds * | Address Parameter | 27541da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27551da177e4SLinus Torvalds * | ASCONF Parameter #1 | 27561da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27571da177e4SLinus Torvalds * \ \ 27581da177e4SLinus Torvalds * / .... / 27591da177e4SLinus Torvalds * \ \ 27601da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27611da177e4SLinus Torvalds * | ASCONF Parameter #N | 27621da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27631da177e4SLinus Torvalds * 27641da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 27651da177e4SLinus Torvalds */ 27661da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 27671da177e4SLinus Torvalds union sctp_addr *addr, 27681da177e4SLinus Torvalds int vparam_len) 27691da177e4SLinus Torvalds { 277065205cc4SXin Long struct sctp_addiphdr asconf; 27711da177e4SLinus Torvalds struct sctp_chunk *retval; 27721da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 27731da177e4SLinus Torvalds union sctp_addr_param addrparam; 27741da177e4SLinus Torvalds int addrlen; 27751da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 27761da177e4SLinus Torvalds 27771da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 27781da177e4SLinus Torvalds if (!addrlen) 27791da177e4SLinus Torvalds return NULL; 27801da177e4SLinus Torvalds length += addrlen; 27811da177e4SLinus Torvalds 27821da177e4SLinus Torvalds /* Create the chunk. */ 2783cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length, 2784cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 27851da177e4SLinus Torvalds if (!retval) 27861da177e4SLinus Torvalds return NULL; 27871da177e4SLinus Torvalds 27881da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 27891da177e4SLinus Torvalds 27901da177e4SLinus Torvalds retval->subh.addip_hdr = 27911da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 27921da177e4SLinus Torvalds retval->param_hdr.v = 27931da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 27941da177e4SLinus Torvalds 27951da177e4SLinus Torvalds return retval; 27961da177e4SLinus Torvalds } 27971da177e4SLinus Torvalds 27981da177e4SLinus Torvalds /* ADDIP 27991da177e4SLinus Torvalds * 3.2.1 Add IP Address 28001da177e4SLinus Torvalds * 0 1 2 3 28011da177e4SLinus 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 28021da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28031da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 28041da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28051da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28061da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28071da177e4SLinus Torvalds * | Address Parameter | 28081da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28091da177e4SLinus Torvalds * 28101da177e4SLinus Torvalds * 3.2.2 Delete IP Address 28111da177e4SLinus Torvalds * 0 1 2 3 28121da177e4SLinus 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 28131da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28141da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 28151da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28161da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28171da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28181da177e4SLinus Torvalds * | Address Parameter | 28191da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28201da177e4SLinus Torvalds * 28211da177e4SLinus Torvalds */ 28221da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 28231da177e4SLinus Torvalds union sctp_addr *laddr, 28241da177e4SLinus Torvalds struct sockaddr *addrs, 2825327c0dabSXin Long int addrcnt, __be16 flags) 28261da177e4SLinus Torvalds { 28271da177e4SLinus Torvalds union sctp_addr_param addr_param; 2828327c0dabSXin Long struct sctp_addip_param param; 28291da177e4SLinus Torvalds int paramlen = sizeof(param); 2830327c0dabSXin Long struct sctp_chunk *retval; 28311da177e4SLinus Torvalds int addr_param_len = 0; 2832327c0dabSXin Long union sctp_addr *addr; 2833327c0dabSXin Long int totallen = 0, i; 28348a07eb0aSMichio Honda int del_pickup = 0; 2835327c0dabSXin Long struct sctp_af *af; 2836327c0dabSXin Long void *addr_buf; 28371da177e4SLinus Torvalds 28381da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 28391da177e4SLinus Torvalds addr_buf = addrs; 28401da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2841ea110733SJoe Perches addr = addr_buf; 28421da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28431da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28441da177e4SLinus Torvalds 28451da177e4SLinus Torvalds totallen += paramlen; 28461da177e4SLinus Torvalds totallen += addr_param_len; 28471da177e4SLinus Torvalds 28481da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28498a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending && !del_pickup) { 28508a07eb0aSMichio Honda /* reuse the parameter length from the same scope one */ 28518a07eb0aSMichio Honda totallen += paramlen; 28528a07eb0aSMichio Honda totallen += addr_param_len; 28538a07eb0aSMichio Honda del_pickup = 1; 2854bb33381dSDaniel Borkmann 2855bb33381dSDaniel Borkmann pr_debug("%s: picked same-scope del_pending addr, " 2856bb33381dSDaniel Borkmann "totallen for all addresses is %d\n", 2857bb33381dSDaniel Borkmann __func__, totallen); 28588a07eb0aSMichio Honda } 28591da177e4SLinus Torvalds } 28601da177e4SLinus Torvalds 28611da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 28621da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 28631da177e4SLinus Torvalds if (!retval) 28641da177e4SLinus Torvalds return NULL; 28651da177e4SLinus Torvalds 28661da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 28671da177e4SLinus Torvalds addr_buf = addrs; 28681da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2869ea110733SJoe Perches addr = addr_buf; 28701da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28711da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28721da177e4SLinus Torvalds param.param_hdr.type = flags; 28731da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 2874978aa047SXin Long param.crr_id = htonl(i); 28751da177e4SLinus Torvalds 28761da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 28771da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 28781da177e4SLinus Torvalds 28791da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28801da177e4SLinus Torvalds } 28818a07eb0aSMichio Honda if (flags == SCTP_PARAM_ADD_IP && del_pickup) { 28828a07eb0aSMichio Honda addr = asoc->asconf_addr_del_pending; 28838a07eb0aSMichio Honda af = sctp_get_af_specific(addr->v4.sin_family); 28848a07eb0aSMichio Honda addr_param_len = af->to_addr_param(addr, &addr_param); 28858a07eb0aSMichio Honda param.param_hdr.type = SCTP_PARAM_DEL_IP; 28868a07eb0aSMichio Honda param.param_hdr.length = htons(paramlen + addr_param_len); 2887978aa047SXin Long param.crr_id = htonl(i); 28888a07eb0aSMichio Honda 28898a07eb0aSMichio Honda sctp_addto_chunk(retval, paramlen, ¶m); 28908a07eb0aSMichio Honda sctp_addto_chunk(retval, addr_param_len, &addr_param); 28918a07eb0aSMichio Honda } 28921da177e4SLinus Torvalds return retval; 28931da177e4SLinus Torvalds } 28941da177e4SLinus Torvalds 28951da177e4SLinus Torvalds /* ADDIP 28961da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 28971da177e4SLinus Torvalds * 0 1 2 3 28981da177e4SLinus 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 28991da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29001da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 29011da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29021da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 29031da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29041da177e4SLinus Torvalds * | Address Parameter | 29051da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29061da177e4SLinus Torvalds * 29071da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 29081da177e4SLinus Torvalds */ 29091da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 29101da177e4SLinus Torvalds union sctp_addr *addr) 29111da177e4SLinus Torvalds { 2912327c0dabSXin Long struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 2913327c0dabSXin Long union sctp_addr_param addrparam; 29148b32f234SXin Long struct sctp_addip_param param; 29151da177e4SLinus Torvalds struct sctp_chunk *retval; 29161da177e4SLinus Torvalds int len = sizeof(param); 29171da177e4SLinus Torvalds int addrlen; 29181da177e4SLinus Torvalds 29191da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 29201da177e4SLinus Torvalds if (!addrlen) 29211da177e4SLinus Torvalds return NULL; 29221da177e4SLinus Torvalds len += addrlen; 29231da177e4SLinus Torvalds 29241da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 29251da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 29261da177e4SLinus Torvalds if (!retval) 29271da177e4SLinus Torvalds return NULL; 29281da177e4SLinus Torvalds 29291da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 29301da177e4SLinus Torvalds param.param_hdr.length = htons(len); 29311da177e4SLinus Torvalds param.crr_id = 0; 29321da177e4SLinus Torvalds 29331da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 29341da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 29351da177e4SLinus Torvalds 29361da177e4SLinus Torvalds return retval; 29371da177e4SLinus Torvalds } 29381da177e4SLinus Torvalds 29391da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 29401da177e4SLinus Torvalds * 0 1 2 3 29411da177e4SLinus 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 29421da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29431da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 29441da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29451da177e4SLinus Torvalds * | Serial Number | 29461da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29471da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 29481da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29491da177e4SLinus Torvalds * \ \ 29501da177e4SLinus Torvalds * / .... / 29511da177e4SLinus Torvalds * \ \ 29521da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29531da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 29541da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29551da177e4SLinus Torvalds * 29561da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 29571da177e4SLinus Torvalds */ 29581da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 29591da177e4SLinus Torvalds __u32 serial, int vparam_len) 29601da177e4SLinus Torvalds { 296165205cc4SXin Long struct sctp_addiphdr asconf; 29621da177e4SLinus Torvalds struct sctp_chunk *retval; 29631da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 29641da177e4SLinus Torvalds 29651da177e4SLinus Torvalds /* Create the chunk. */ 2966cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length, 2967cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 29681da177e4SLinus Torvalds if (!retval) 29691da177e4SLinus Torvalds return NULL; 29701da177e4SLinus Torvalds 29711da177e4SLinus Torvalds asconf.serial = htonl(serial); 29721da177e4SLinus Torvalds 29731da177e4SLinus Torvalds retval->subh.addip_hdr = 29741da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 29751da177e4SLinus Torvalds 29761da177e4SLinus Torvalds return retval; 29771da177e4SLinus Torvalds } 29781da177e4SLinus Torvalds 29791da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 29809f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 29818b32f234SXin Long __be16 err_code, 29828b32f234SXin Long struct sctp_addip_param *asconf_param) 29831da177e4SLinus Torvalds { 29848b32f234SXin Long struct sctp_addip_param ack_param; 2985d8238d9dSXin Long struct sctp_errhdr 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, 30248b32f234SXin Long struct sctp_addip_param *asconf_param) 30251da177e4SLinus Torvalds { 30261da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3027327c0dabSXin Long struct sctp_transport *peer; 3028327c0dabSXin Long union sctp_addr addr; 3029327c0dabSXin Long struct sctp_af *af; 30301da177e4SLinus Torvalds 30318b32f234SXin Long addr_param = (void *)asconf_param + sizeof(*asconf_param); 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 30742277c7cdSRichard Haines if (security_sctp_bind_connect(asoc->ep->base.sk, 30752277c7cdSRichard Haines SCTP_PARAM_ADD_IP, 30762277c7cdSRichard Haines (struct sockaddr *)&addr, 30772277c7cdSRichard Haines af->sockaddr_len)) 30782277c7cdSRichard Haines return SCTP_ERROR_REQ_REFUSED; 30792277c7cdSRichard Haines 30801da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 30811da177e4SLinus Torvalds * request and does not have the local resources to add this 30821da177e4SLinus Torvalds * new address to the association, it MUST return an Error 30831da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 30841da177e4SLinus Torvalds * Due to Resource Shortage'. 30851da177e4SLinus Torvalds */ 30861da177e4SLinus Torvalds 3087dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 30881da177e4SLinus Torvalds if (!peer) 30891da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 30901da177e4SLinus Torvalds 30911da177e4SLinus Torvalds /* Start the heartbeat timer. */ 3092ba6f5e33SMarcelo Ricardo Leitner sctp_transport_reset_hb_timer(peer); 30936af29cccSMichio Honda asoc->new_transport = peer; 30941da177e4SLinus Torvalds break; 30951da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 30961da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 30971da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 30981da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 30991da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 31001da177e4SLinus Torvalds */ 310142e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 31021da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 31031da177e4SLinus Torvalds 31041da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 31051da177e4SLinus Torvalds * address which is also the source address of the IP packet 31061da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 31071da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 31081da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 31091da177e4SLinus Torvalds * Delete Source IP Address' 31101da177e4SLinus Torvalds */ 3111b1364104SMichio Honda if (sctp_cmp_addr_exact(&asconf->source, &addr)) 31121da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 31131da177e4SLinus Torvalds 311442e30bf3SVlad Yasevich /* Section 4.2.2 311542e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 311642e30bf3SVlad Yasevich * addresses of the peer except the source address of the 311742e30bf3SVlad Yasevich * packet MUST be deleted. 311842e30bf3SVlad Yasevich */ 311942e30bf3SVlad Yasevich if (af->is_any(&addr)) { 312042e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 312142e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 312242e30bf3SVlad Yasevich asconf->transport); 31237c5a9461Slucien return SCTP_ERROR_NO_ERROR; 31247c5a9461Slucien } 31257c5a9461Slucien 31267c5a9461Slucien /* If the address is not part of the association, the 31277c5a9461Slucien * ASCONF-ACK with Error Cause Indication Parameter 31287c5a9461Slucien * which including cause of Unresolvable Address should 31297c5a9461Slucien * be sent. 31307c5a9461Slucien */ 31317c5a9461Slucien peer = sctp_assoc_lookup_paddr(asoc, &addr); 31327c5a9461Slucien if (!peer) 31337c5a9461Slucien return SCTP_ERROR_DNS_FAILED; 31347c5a9461Slucien 31357c5a9461Slucien sctp_assoc_rm_peer(asoc, peer); 31361da177e4SLinus Torvalds break; 31371da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 313842e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 313942e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 314042e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 314142e30bf3SVlad Yasevich * primary. 314242e30bf3SVlad Yasevich */ 314342e30bf3SVlad Yasevich if (af->is_any(&addr)) 314442e30bf3SVlad Yasevich memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); 314542e30bf3SVlad Yasevich 31462277c7cdSRichard Haines if (security_sctp_bind_connect(asoc->ep->base.sk, 31472277c7cdSRichard Haines SCTP_PARAM_SET_PRIMARY, 31482277c7cdSRichard Haines (struct sockaddr *)&addr, 31492277c7cdSRichard Haines af->sockaddr_len)) 31502277c7cdSRichard Haines return SCTP_ERROR_REQ_REFUSED; 31512277c7cdSRichard Haines 3152dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 31531da177e4SLinus Torvalds if (!peer) 3154945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 31551da177e4SLinus Torvalds 31561da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 31571da177e4SLinus Torvalds break; 31581da177e4SLinus Torvalds } 31591da177e4SLinus Torvalds 31601da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 31611da177e4SLinus Torvalds } 31621da177e4SLinus Torvalds 31636f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 31649de7922bSDaniel Borkmann bool sctp_verify_asconf(const struct sctp_association *asoc, 31659de7922bSDaniel Borkmann struct sctp_chunk *chunk, bool addr_param_needed, 31669de7922bSDaniel Borkmann struct sctp_paramhdr **errp) 31679de7922bSDaniel Borkmann { 316868d75469SXin Long struct sctp_addip_chunk *addip; 31699de7922bSDaniel Borkmann bool addr_param_seen = false; 3170327c0dabSXin Long union sctp_params param; 31716f4c618dSWei Yongjun 317268d75469SXin Long addip = (struct sctp_addip_chunk *)chunk->chunk_hdr; 31739de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 31749de7922bSDaniel Borkmann size_t length = ntohs(param.p->length); 31759de7922bSDaniel Borkmann 31766f4c618dSWei Yongjun *errp = param.p; 31776f4c618dSWei Yongjun switch (param.p->type) { 31789de7922bSDaniel Borkmann case SCTP_PARAM_ERR_CAUSE: 31799de7922bSDaniel Borkmann break; 31809de7922bSDaniel Borkmann case SCTP_PARAM_IPV4_ADDRESS: 3181a38905e6SXin Long if (length != sizeof(struct sctp_ipv4addr_param)) 31829de7922bSDaniel Borkmann return false; 3183ce7b4cccSlucien /* ensure there is only one addr param and it's in the 3184ce7b4cccSlucien * beginning of addip_hdr params, or we reject it. 3185ce7b4cccSlucien */ 3186ce7b4cccSlucien if (param.v != addip->addip_hdr.params) 3187ce7b4cccSlucien return false; 31889de7922bSDaniel Borkmann addr_param_seen = true; 31899de7922bSDaniel Borkmann break; 31909de7922bSDaniel Borkmann case SCTP_PARAM_IPV6_ADDRESS: 319100987cc0SXin Long if (length != sizeof(struct sctp_ipv6addr_param)) 31929de7922bSDaniel Borkmann return false; 3193ce7b4cccSlucien if (param.v != addip->addip_hdr.params) 3194ce7b4cccSlucien return false; 31959de7922bSDaniel Borkmann addr_param_seen = true; 31969de7922bSDaniel Borkmann break; 31976f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 31986f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 31996f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 32009de7922bSDaniel Borkmann /* In ASCONF chunks, these need to be first. */ 32019de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 32029de7922bSDaniel Borkmann return false; 32039de7922bSDaniel Borkmann length = ntohs(param.addip->param_hdr.length); 32048b32f234SXin Long if (length < sizeof(struct sctp_addip_param) + 32053c918704SXin Long sizeof(**errp)) 32069de7922bSDaniel Borkmann return false; 32076f4c618dSWei Yongjun break; 32086f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 32096f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 32108b32f234SXin Long if (length != sizeof(struct sctp_addip_param)) 32119de7922bSDaniel Borkmann return false; 32126f4c618dSWei Yongjun break; 32136f4c618dSWei Yongjun default: 32149de7922bSDaniel Borkmann /* This is unkown to us, reject! */ 32159de7922bSDaniel Borkmann return false; 32169de7922bSDaniel Borkmann } 32176f4c618dSWei Yongjun } 32186f4c618dSWei Yongjun 32199de7922bSDaniel Borkmann /* Remaining sanity checks. */ 32209de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 32219de7922bSDaniel Borkmann return false; 32229de7922bSDaniel Borkmann if (!addr_param_needed && addr_param_seen) 32239de7922bSDaniel Borkmann return false; 32249de7922bSDaniel Borkmann if (param.v != chunk->chunk_end) 32259de7922bSDaniel Borkmann return false; 32266f4c618dSWei Yongjun 32279de7922bSDaniel Borkmann return true; 32286f4c618dSWei Yongjun } 32296f4c618dSWei Yongjun 32301da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 32311da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 32321da177e4SLinus Torvalds */ 32331da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 32341da177e4SLinus Torvalds struct sctp_chunk *asconf) 32351da177e4SLinus Torvalds { 32361da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3237327c0dabSXin Long struct sctp_addip_chunk *addip; 32381da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 3239327c0dabSXin Long bool all_param_pass = true; 3240327c0dabSXin Long struct sctp_addiphdr *hdr; 3241327c0dabSXin Long int length = 0, chunk_len; 3242327c0dabSXin Long union sctp_params param; 3243dbc16db1SAl Viro __be16 err_code; 32441da177e4SLinus Torvalds __u32 serial; 32451da177e4SLinus Torvalds 324668d75469SXin Long addip = (struct sctp_addip_chunk *)asconf->chunk_hdr; 3247922dbc5bSXin Long chunk_len = ntohs(asconf->chunk_hdr->length) - 3248922dbc5bSXin Long sizeof(struct sctp_chunkhdr); 324965205cc4SXin Long hdr = (struct sctp_addiphdr *)asconf->skb->data; 32501da177e4SLinus Torvalds serial = ntohl(hdr->serial); 32511da177e4SLinus Torvalds 32521da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 325365205cc4SXin Long length = sizeof(*hdr); 32541da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 32551da177e4SLinus Torvalds chunk_len -= length; 32561da177e4SLinus Torvalds 32571da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 32587aa1b54bSJoe Perches * asconf parameter. 32591da177e4SLinus Torvalds */ 32606a435732SShan Wei length = ntohs(addr_param->p.length); 32611da177e4SLinus Torvalds chunk_len -= length; 32621da177e4SLinus Torvalds 32631da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 32641da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 32652cab86beSWei Yongjun * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF 32667aa1b54bSJoe Perches * parameters. 32671da177e4SLinus Torvalds */ 32682cab86beSWei Yongjun asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); 32691da177e4SLinus Torvalds if (!asconf_ack) 32701da177e4SLinus Torvalds goto done; 32711da177e4SLinus Torvalds 32721da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 32739de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 32749de7922bSDaniel Borkmann /* Skip preceeding address parameters. */ 32759de7922bSDaniel Borkmann if (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 32769de7922bSDaniel Borkmann param.p->type == SCTP_PARAM_IPV6_ADDRESS) 32779de7922bSDaniel Borkmann continue; 32789de7922bSDaniel Borkmann 32791da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 32809de7922bSDaniel Borkmann param.addip); 32811da177e4SLinus Torvalds /* ADDIP 4.1 A7) 32821da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 32831da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 32841da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 32851da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 32861da177e4SLinus Torvalds * a specific success indication is present for the parameter. 32871da177e4SLinus Torvalds */ 32889de7922bSDaniel Borkmann if (err_code != SCTP_ERROR_NO_ERROR) 32899de7922bSDaniel Borkmann all_param_pass = false; 32901da177e4SLinus Torvalds if (!all_param_pass) 32919de7922bSDaniel Borkmann sctp_add_asconf_response(asconf_ack, param.addip->crr_id, 32929de7922bSDaniel Borkmann err_code, param.addip); 32931da177e4SLinus Torvalds 32941da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 32951da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 32961da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 32971da177e4SLinus Torvalds * in the ASCONF. 32981da177e4SLinus Torvalds */ 32999de7922bSDaniel Borkmann if (err_code == SCTP_ERROR_RSRC_LOW) 33001da177e4SLinus Torvalds goto done; 33011da177e4SLinus Torvalds } 33021da177e4SLinus Torvalds done: 33031da177e4SLinus Torvalds asoc->peer.addip_serial++; 33041da177e4SLinus Torvalds 33051da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 33061da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 33071da177e4SLinus Torvalds */ 33081da177e4SLinus Torvalds if (asconf_ack) { 33091da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3310a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3311a08de64dSVlad Yasevich &asoc->asconf_ack_list); 33121da177e4SLinus Torvalds } 33131da177e4SLinus Torvalds 33141da177e4SLinus Torvalds return asconf_ack; 33151da177e4SLinus Torvalds } 33161da177e4SLinus Torvalds 33171da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 3318425e0f68SWei Yongjun static void sctp_asconf_param_success(struct sctp_association *asoc, 33198b32f234SXin Long struct sctp_addip_param *asconf_param) 33201da177e4SLinus Torvalds { 33211da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 33221da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3323dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 3324327c0dabSXin Long struct sctp_transport *transport; 3325327c0dabSXin Long union sctp_addr addr; 3326327c0dabSXin Long struct sctp_af *af; 33271da177e4SLinus Torvalds 33288b32f234SXin Long addr_param = (void *)asconf_param + sizeof(*asconf_param); 33291da177e4SLinus Torvalds 33301da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 33316a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 3332dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 33331da177e4SLinus Torvalds 33341da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 33351da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3336559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3337559cf710SVlad Yasevich * held, so the list can not change. 3338559cf710SVlad Yasevich */ 33390ed90fb0SVlad Yasevich local_bh_disable(); 3340559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3341dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3342f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3343dc022a98SSridhar Samudrala } 33440ed90fb0SVlad Yasevich local_bh_enable(); 33453cd9749cSWei Yongjun list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33463cd9749cSWei Yongjun transports) { 3347c86a773cSJulian Anastasov sctp_transport_dst_release(transport); 33483cd9749cSWei Yongjun } 33491da177e4SLinus Torvalds break; 33501da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 33510ed90fb0SVlad Yasevich local_bh_disable(); 3352425e0f68SWei Yongjun sctp_del_bind_addr(bp, &addr); 33538a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending != NULL && 33548a07eb0aSMichio Honda sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { 33558a07eb0aSMichio Honda kfree(asoc->asconf_addr_del_pending); 33568a07eb0aSMichio Honda asoc->asconf_addr_del_pending = NULL; 33578a07eb0aSMichio Honda } 33580ed90fb0SVlad Yasevich local_bh_enable(); 33599dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33609dbc15f0SRobert P. J. Day transports) { 3361c86a773cSJulian Anastasov sctp_transport_dst_release(transport); 33621da177e4SLinus Torvalds } 33631da177e4SLinus Torvalds break; 33641da177e4SLinus Torvalds default: 33651da177e4SLinus Torvalds break; 33661da177e4SLinus Torvalds } 33671da177e4SLinus Torvalds } 33681da177e4SLinus Torvalds 33691da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 33701da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 33711da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 33721da177e4SLinus Torvalds * ADDIP 4.1 33731da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 33741da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 33751da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 33761da177e4SLinus Torvalds * specific success indication is present for the parameter. 33771da177e4SLinus Torvalds */ 3378dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 33798b32f234SXin Long struct sctp_addip_param *asconf_param, 33801da177e4SLinus Torvalds int no_err) 33811da177e4SLinus Torvalds { 33828b32f234SXin Long struct sctp_addip_param *asconf_ack_param; 3383d8238d9dSXin Long struct sctp_errhdr *err_param; 3384f3830cccSWei Yongjun int asconf_ack_len; 3385dbc16db1SAl Viro __be16 err_code; 3386327c0dabSXin Long int length; 33871da177e4SLinus Torvalds 33881da177e4SLinus Torvalds if (no_err) 33891da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 33901da177e4SLinus Torvalds else 33911da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 33921da177e4SLinus Torvalds 3393f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3394922dbc5bSXin Long sizeof(struct sctp_chunkhdr); 3395f3830cccSWei Yongjun 33961da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 33971da177e4SLinus Torvalds * the first asconf_ack parameter. 33981da177e4SLinus Torvalds */ 339965205cc4SXin Long length = sizeof(struct sctp_addiphdr); 34008b32f234SXin Long asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data + 34011da177e4SLinus Torvalds length); 34021da177e4SLinus Torvalds asconf_ack_len -= length; 34031da177e4SLinus Torvalds 34041da177e4SLinus Torvalds while (asconf_ack_len > 0) { 34051da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 34061da177e4SLinus Torvalds switch (asconf_ack_param->param_hdr.type) { 34071da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 34081da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 34091da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 34108b32f234SXin Long length = sizeof(*asconf_ack_param); 3411ea110733SJoe Perches err_param = (void *)asconf_ack_param + length; 34121da177e4SLinus Torvalds asconf_ack_len -= length; 34131da177e4SLinus Torvalds if (asconf_ack_len > 0) 34141da177e4SLinus Torvalds return err_param->cause; 34151da177e4SLinus Torvalds else 34161da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 34171da177e4SLinus Torvalds break; 34181da177e4SLinus Torvalds default: 34191da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 34201da177e4SLinus Torvalds } 34211da177e4SLinus Torvalds } 34221da177e4SLinus Torvalds 34231da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 3424ea110733SJoe Perches asconf_ack_param = (void *)asconf_ack_param + length; 34251da177e4SLinus Torvalds asconf_ack_len -= length; 34261da177e4SLinus Torvalds } 34271da177e4SLinus Torvalds 34281da177e4SLinus Torvalds return err_code; 34291da177e4SLinus Torvalds } 34301da177e4SLinus Torvalds 34311da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 34321da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 34331da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 34341da177e4SLinus Torvalds { 34351da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 34368b32f234SXin Long struct sctp_addip_param *asconf_param; 3437327c0dabSXin Long __be16 err_code = SCTP_ERROR_NO_ERROR; 3438327c0dabSXin Long union sctp_addr_param *addr_param; 34391da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 34401da177e4SLinus Torvalds int all_param_pass = 0; 3441327c0dabSXin Long int length = 0; 34421da177e4SLinus Torvalds int no_err = 1; 34431da177e4SLinus Torvalds int retval = 0; 34441da177e4SLinus Torvalds 34451da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 34461da177e4SLinus Torvalds * a pointer to address parameter. 34471da177e4SLinus Torvalds */ 344868d75469SXin Long length = sizeof(struct sctp_addip_chunk); 34491da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 34501da177e4SLinus Torvalds asconf_len -= length; 34511da177e4SLinus Torvalds 34521da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 34537aa1b54bSJoe Perches * pointer to the first asconf parameter. 34541da177e4SLinus Torvalds */ 34556a435732SShan Wei length = ntohs(addr_param->p.length); 3456ea110733SJoe Perches asconf_param = (void *)addr_param + length; 34571da177e4SLinus Torvalds asconf_len -= length; 34581da177e4SLinus Torvalds 34591da177e4SLinus Torvalds /* ADDIP 4.1 34601da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 34611da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 34621da177e4SLinus Torvalds * successful. 34631da177e4SLinus Torvalds */ 346465205cc4SXin Long if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr)) 34651da177e4SLinus Torvalds all_param_pass = 1; 34661da177e4SLinus Torvalds 34671da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 34681da177e4SLinus Torvalds while (asconf_len > 0) { 34691da177e4SLinus Torvalds if (all_param_pass) 34701da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 34711da177e4SLinus Torvalds else { 34721da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 34731da177e4SLinus Torvalds asconf_param, 34741da177e4SLinus Torvalds no_err); 34751da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 34761da177e4SLinus Torvalds no_err = 0; 34771da177e4SLinus Torvalds } 34781da177e4SLinus Torvalds 34791da177e4SLinus Torvalds switch (err_code) { 34801da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 3481425e0f68SWei Yongjun sctp_asconf_param_success(asoc, asconf_param); 34821da177e4SLinus Torvalds break; 34831da177e4SLinus Torvalds 34841da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 34851da177e4SLinus Torvalds retval = 1; 34861da177e4SLinus Torvalds break; 34871da177e4SLinus Torvalds 3488a987f762SWei Yongjun case SCTP_ERROR_UNKNOWN_PARAM: 34891da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 34901da177e4SLinus Torvalds * future. 34911da177e4SLinus Torvalds */ 34921da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 34931da177e4SLinus Torvalds asconf_param->param_hdr.type; 34941da177e4SLinus Torvalds break; 34951da177e4SLinus Torvalds 34961da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 34971da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 34981da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 34991da177e4SLinus Torvalds default: 35001da177e4SLinus Torvalds break; 35011da177e4SLinus Torvalds } 35021da177e4SLinus Torvalds 35031da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 35041da177e4SLinus Torvalds * one. 35051da177e4SLinus Torvalds */ 35061da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3507ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 35081da177e4SLinus Torvalds asconf_len -= length; 35091da177e4SLinus Torvalds } 35101da177e4SLinus Torvalds 3511ddc4bbeeSMichio Honda if (no_err && asoc->src_out_of_asoc_ok) { 35128a07eb0aSMichio Honda asoc->src_out_of_asoc_ok = 0; 3513ddc4bbeeSMichio Honda sctp_transport_immediate_rtx(asoc->peer.primary_path); 3514ddc4bbeeSMichio Honda } 35158a07eb0aSMichio Honda 35161da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 35175f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 35181da177e4SLinus Torvalds sctp_chunk_free(asconf); 35191da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 35201da177e4SLinus Torvalds 35211da177e4SLinus Torvalds return retval; 35221da177e4SLinus Torvalds } 35231da177e4SLinus Torvalds 35241da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 35251da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 35261da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 35271da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 35281da177e4SLinus Torvalds { 35291da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 35301da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 35311da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 35321da177e4SLinus Torvalds size_t hint; 35331da177e4SLinus Torvalds int i; 35341da177e4SLinus Torvalds 35351da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 35361da177e4SLinus Torvalds 3537cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC); 35381da177e4SLinus Torvalds 35391da177e4SLinus Torvalds if (!retval) 35401da177e4SLinus Torvalds return NULL; 35411da177e4SLinus Torvalds 35421da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 35431da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 35441da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 35451da177e4SLinus Torvalds 35461da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 35471da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 35481da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 35491da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 35501da177e4SLinus Torvalds } 35511da177e4SLinus Torvalds 35521da177e4SLinus Torvalds return retval; 35531da177e4SLinus Torvalds } 3554cc16f00fSXin Long 35552d07a49aSXin Long struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc, 35562d07a49aSXin Long __u32 new_cum_tsn, size_t nstreams, 35572d07a49aSXin Long struct sctp_ifwdtsn_skip *skiplist) 35582d07a49aSXin Long { 35592d07a49aSXin Long struct sctp_chunk *retval = NULL; 35602d07a49aSXin Long struct sctp_ifwdtsn_hdr ftsn_hdr; 35612d07a49aSXin Long size_t hint; 35622d07a49aSXin Long 35632d07a49aSXin Long hint = (nstreams + 1) * sizeof(__u32); 35642d07a49aSXin Long 35652d07a49aSXin Long retval = sctp_make_control(asoc, SCTP_CID_I_FWD_TSN, 0, hint, 35662d07a49aSXin Long GFP_ATOMIC); 35672d07a49aSXin Long if (!retval) 35682d07a49aSXin Long return NULL; 35692d07a49aSXin Long 35702d07a49aSXin Long ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 35712d07a49aSXin Long retval->subh.ifwdtsn_hdr = 35722d07a49aSXin Long sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 35732d07a49aSXin Long 35742d07a49aSXin Long sctp_addto_chunk(retval, nstreams * sizeof(skiplist[0]), skiplist); 35752d07a49aSXin Long 35762d07a49aSXin Long return retval; 35772d07a49aSXin Long } 35782d07a49aSXin Long 3579cc16f00fSXin Long /* RE-CONFIG 3.1 (RE-CONFIG chunk) 3580cc16f00fSXin Long * 0 1 2 3 3581cc16f00fSXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3582cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3583cc16f00fSXin Long * | Type = 130 | Chunk Flags | Chunk Length | 3584cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3585cc16f00fSXin Long * \ \ 3586cc16f00fSXin Long * / Re-configuration Parameter / 3587cc16f00fSXin Long * \ \ 3588cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3589cc16f00fSXin Long * \ \ 3590cc16f00fSXin Long * / Re-configuration Parameter (optional) / 3591cc16f00fSXin Long * \ \ 3592cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3593cc16f00fSXin Long */ 3594327c0dabSXin Long static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc, 3595cc16f00fSXin Long int length) 3596cc16f00fSXin Long { 3597cc16f00fSXin Long struct sctp_reconf_chunk *reconf; 3598cc16f00fSXin Long struct sctp_chunk *retval; 3599cc16f00fSXin Long 3600cc16f00fSXin Long retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length, 3601cc16f00fSXin Long GFP_ATOMIC); 3602cc16f00fSXin Long if (!retval) 3603cc16f00fSXin Long return NULL; 3604cc16f00fSXin Long 3605cc16f00fSXin Long reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr; 3606cc16f00fSXin Long retval->param_hdr.v = reconf->params; 3607cc16f00fSXin Long 3608cc16f00fSXin Long return retval; 3609cc16f00fSXin Long } 3610cc16f00fSXin Long 3611cc16f00fSXin Long /* RE-CONFIG 4.1 (STREAM OUT RESET) 3612cc16f00fSXin Long * 0 1 2 3 3613cc16f00fSXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3614cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3615cc16f00fSXin Long * | Parameter Type = 13 | Parameter Length = 16 + 2 * N | 3616cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3617cc16f00fSXin Long * | Re-configuration Request Sequence Number | 3618cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3619cc16f00fSXin Long * | Re-configuration Response Sequence Number | 3620cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3621cc16f00fSXin Long * | Sender's Last Assigned TSN | 3622cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3623cc16f00fSXin Long * | Stream Number 1 (optional) | Stream Number 2 (optional) | 3624cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3625cc16f00fSXin Long * / ...... / 3626cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3627cc16f00fSXin Long * | Stream Number N-1 (optional) | Stream Number N (optional) | 3628cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3629cc16f00fSXin Long * 3630cc16f00fSXin Long * RE-CONFIG 4.2 (STREAM IN RESET) 3631cc16f00fSXin Long * 0 1 2 3 3632cc16f00fSXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3633cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3634cc16f00fSXin Long * | Parameter Type = 14 | Parameter Length = 8 + 2 * N | 3635cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3636cc16f00fSXin Long * | Re-configuration Request Sequence Number | 3637cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3638cc16f00fSXin Long * | Stream Number 1 (optional) | Stream Number 2 (optional) | 3639cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3640cc16f00fSXin Long * / ...... / 3641cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3642cc16f00fSXin Long * | Stream Number N-1 (optional) | Stream Number N (optional) | 3643cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3644cc16f00fSXin Long */ 3645cc16f00fSXin Long struct sctp_chunk *sctp_make_strreset_req( 3646cc16f00fSXin Long const struct sctp_association *asoc, 36471da4fc97SXin Long __u16 stream_num, __be16 *stream_list, 3648cc16f00fSXin Long bool out, bool in) 3649cc16f00fSXin Long { 3650423852f8SXin Long __u16 stream_len = stream_num * sizeof(__u16); 3651cc16f00fSXin Long struct sctp_strreset_outreq outreq; 3652cc16f00fSXin Long struct sctp_strreset_inreq inreq; 3653cc16f00fSXin Long struct sctp_chunk *retval; 365416e1a919SXin Long __u16 outlen, inlen; 3655cc16f00fSXin Long 3656cc16f00fSXin Long outlen = (sizeof(outreq) + stream_len) * out; 3657cc16f00fSXin Long inlen = (sizeof(inreq) + stream_len) * in; 3658cc16f00fSXin Long 3659cc16f00fSXin Long retval = sctp_make_reconf(asoc, outlen + inlen); 3660cc16f00fSXin Long if (!retval) 3661cc16f00fSXin Long return NULL; 3662cc16f00fSXin Long 3663cc16f00fSXin Long if (outlen) { 3664cc16f00fSXin Long outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST; 3665cc16f00fSXin Long outreq.param_hdr.length = htons(outlen); 3666cc16f00fSXin Long outreq.request_seq = htonl(asoc->strreset_outseq); 3667cc16f00fSXin Long outreq.response_seq = htonl(asoc->strreset_inseq - 1); 3668cc16f00fSXin Long outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1); 3669cc16f00fSXin Long 3670cc16f00fSXin Long sctp_addto_chunk(retval, sizeof(outreq), &outreq); 3671cc16f00fSXin Long 3672cc16f00fSXin Long if (stream_len) 3673cc16f00fSXin Long sctp_addto_chunk(retval, stream_len, stream_list); 3674cc16f00fSXin Long } 3675cc16f00fSXin Long 3676cc16f00fSXin Long if (inlen) { 3677cc16f00fSXin Long inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST; 3678cc16f00fSXin Long inreq.param_hdr.length = htons(inlen); 3679cc16f00fSXin Long inreq.request_seq = htonl(asoc->strreset_outseq + out); 3680cc16f00fSXin Long 3681cc16f00fSXin Long sctp_addto_chunk(retval, sizeof(inreq), &inreq); 3682cc16f00fSXin Long 3683cc16f00fSXin Long if (stream_len) 3684cc16f00fSXin Long sctp_addto_chunk(retval, stream_len, stream_list); 3685cc16f00fSXin Long } 3686cc16f00fSXin Long 3687cc16f00fSXin Long return retval; 3688cc16f00fSXin Long } 3689c56480a1SXin Long 3690c56480a1SXin Long /* RE-CONFIG 4.3 (SSN/TSN RESET ALL) 3691c56480a1SXin Long * 0 1 2 3 3692c56480a1SXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3693c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3694c56480a1SXin Long * | Parameter Type = 15 | Parameter Length = 8 | 3695c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3696c56480a1SXin Long * | Re-configuration Request Sequence Number | 3697c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3698c56480a1SXin Long */ 3699c56480a1SXin Long struct sctp_chunk *sctp_make_strreset_tsnreq( 3700c56480a1SXin Long const struct sctp_association *asoc) 3701c56480a1SXin Long { 3702c56480a1SXin Long struct sctp_strreset_tsnreq tsnreq; 3703c56480a1SXin Long __u16 length = sizeof(tsnreq); 3704c56480a1SXin Long struct sctp_chunk *retval; 3705c56480a1SXin Long 3706c56480a1SXin Long retval = sctp_make_reconf(asoc, length); 3707c56480a1SXin Long if (!retval) 3708c56480a1SXin Long return NULL; 3709c56480a1SXin Long 3710c56480a1SXin Long tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST; 3711c56480a1SXin Long tsnreq.param_hdr.length = htons(length); 3712c56480a1SXin Long tsnreq.request_seq = htonl(asoc->strreset_outseq); 3713c56480a1SXin Long 3714c56480a1SXin Long sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq); 3715c56480a1SXin Long 3716c56480a1SXin Long return retval; 3717c56480a1SXin Long } 371878098117SXin Long 371978098117SXin Long /* RE-CONFIG 4.5/4.6 (ADD STREAM) 372078098117SXin Long * 0 1 2 3 372178098117SXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 372278098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 372378098117SXin Long * | Parameter Type = 17 | Parameter Length = 12 | 372478098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 372578098117SXin Long * | Re-configuration Request Sequence Number | 372678098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 372778098117SXin Long * | Number of new streams | Reserved | 372878098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 372978098117SXin Long */ 373078098117SXin Long struct sctp_chunk *sctp_make_strreset_addstrm( 373178098117SXin Long const struct sctp_association *asoc, 373278098117SXin Long __u16 out, __u16 in) 373378098117SXin Long { 373478098117SXin Long struct sctp_strreset_addstrm addstrm; 373578098117SXin Long __u16 size = sizeof(addstrm); 373678098117SXin Long struct sctp_chunk *retval; 373778098117SXin Long 373878098117SXin Long retval = sctp_make_reconf(asoc, (!!out + !!in) * size); 373978098117SXin Long if (!retval) 374078098117SXin Long return NULL; 374178098117SXin Long 374278098117SXin Long if (out) { 374378098117SXin Long addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS; 374478098117SXin Long addstrm.param_hdr.length = htons(size); 374578098117SXin Long addstrm.number_of_streams = htons(out); 374678098117SXin Long addstrm.request_seq = htonl(asoc->strreset_outseq); 374778098117SXin Long addstrm.reserved = 0; 374878098117SXin Long 374978098117SXin Long sctp_addto_chunk(retval, size, &addstrm); 375078098117SXin Long } 375178098117SXin Long 375278098117SXin Long if (in) { 375378098117SXin Long addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS; 375478098117SXin Long addstrm.param_hdr.length = htons(size); 375578098117SXin Long addstrm.number_of_streams = htons(in); 375678098117SXin Long addstrm.request_seq = htonl(asoc->strreset_outseq + !!out); 375778098117SXin Long addstrm.reserved = 0; 375878098117SXin Long 375978098117SXin Long sctp_addto_chunk(retval, size, &addstrm); 376078098117SXin Long } 376178098117SXin Long 376278098117SXin Long return retval; 376378098117SXin Long } 3764bd4b9f8bSXin Long 3765bd4b9f8bSXin Long /* RE-CONFIG 4.4 (RESP) 3766bd4b9f8bSXin Long * 0 1 2 3 3767bd4b9f8bSXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3768bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3769bd4b9f8bSXin Long * | Parameter Type = 16 | Parameter Length | 3770bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3771bd4b9f8bSXin Long * | Re-configuration Response Sequence Number | 3772bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3773bd4b9f8bSXin Long * | Result | 3774bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3775bd4b9f8bSXin Long */ 3776327c0dabSXin Long struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc, 3777bd4b9f8bSXin Long __u32 result, __u32 sn) 3778bd4b9f8bSXin Long { 3779bd4b9f8bSXin Long struct sctp_strreset_resp resp; 3780bd4b9f8bSXin Long __u16 length = sizeof(resp); 3781bd4b9f8bSXin Long struct sctp_chunk *retval; 3782bd4b9f8bSXin Long 3783bd4b9f8bSXin Long retval = sctp_make_reconf(asoc, length); 3784bd4b9f8bSXin Long if (!retval) 3785bd4b9f8bSXin Long return NULL; 3786bd4b9f8bSXin Long 3787bd4b9f8bSXin Long resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; 3788bd4b9f8bSXin Long resp.param_hdr.length = htons(length); 3789bd4b9f8bSXin Long resp.response_seq = htonl(sn); 3790bd4b9f8bSXin Long resp.result = htonl(result); 3791bd4b9f8bSXin Long 3792bd4b9f8bSXin Long sctp_addto_chunk(retval, sizeof(resp), &resp); 3793bd4b9f8bSXin Long 3794bd4b9f8bSXin Long return retval; 3795bd4b9f8bSXin Long } 3796bd4b9f8bSXin Long 3797bd4b9f8bSXin Long /* RE-CONFIG 4.4 OPTIONAL (TSNRESP) 3798bd4b9f8bSXin Long * 0 1 2 3 3799bd4b9f8bSXin Long * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3800bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3801bd4b9f8bSXin Long * | Parameter Type = 16 | Parameter Length | 3802bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3803bd4b9f8bSXin Long * | Re-configuration Response Sequence Number | 3804bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3805bd4b9f8bSXin Long * | Result | 3806bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3807bd4b9f8bSXin Long * | Sender's Next TSN (optional) | 3808bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3809bd4b9f8bSXin Long * | Receiver's Next TSN (optional) | 3810bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3811bd4b9f8bSXin Long */ 3812327c0dabSXin Long struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc, 3813bd4b9f8bSXin Long __u32 result, __u32 sn, 3814327c0dabSXin Long __u32 sender_tsn, 3815327c0dabSXin Long __u32 receiver_tsn) 3816bd4b9f8bSXin Long { 3817bd4b9f8bSXin Long struct sctp_strreset_resptsn tsnresp; 3818bd4b9f8bSXin Long __u16 length = sizeof(tsnresp); 3819bd4b9f8bSXin Long struct sctp_chunk *retval; 3820bd4b9f8bSXin Long 3821bd4b9f8bSXin Long retval = sctp_make_reconf(asoc, length); 3822bd4b9f8bSXin Long if (!retval) 3823bd4b9f8bSXin Long return NULL; 3824bd4b9f8bSXin Long 3825bd4b9f8bSXin Long tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; 3826bd4b9f8bSXin Long tsnresp.param_hdr.length = htons(length); 3827bd4b9f8bSXin Long 3828bd4b9f8bSXin Long tsnresp.response_seq = htonl(sn); 3829bd4b9f8bSXin Long tsnresp.result = htonl(result); 3830bd4b9f8bSXin Long tsnresp.senders_next_tsn = htonl(sender_tsn); 3831bd4b9f8bSXin Long tsnresp.receivers_next_tsn = htonl(receiver_tsn); 3832bd4b9f8bSXin Long 3833bd4b9f8bSXin Long sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp); 3834bd4b9f8bSXin Long 3835bd4b9f8bSXin Long return retval; 3836bd4b9f8bSXin Long } 3837ea625043SXin Long 3838ea625043SXin Long bool sctp_verify_reconf(const struct sctp_association *asoc, 3839ea625043SXin Long struct sctp_chunk *chunk, 3840ea625043SXin Long struct sctp_paramhdr **errp) 3841ea625043SXin Long { 3842ea625043SXin Long struct sctp_reconf_chunk *hdr; 3843ea625043SXin Long union sctp_params param; 38441da4fc97SXin Long __be16 last = 0; 38451da4fc97SXin Long __u16 cnt = 0; 3846ea625043SXin Long 3847ea625043SXin Long hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; 3848ea625043SXin Long sctp_walk_params(param, hdr, params) { 3849ea625043SXin Long __u16 length = ntohs(param.p->length); 3850ea625043SXin Long 3851ea625043SXin Long *errp = param.p; 3852ea625043SXin Long if (cnt++ > 2) 3853ea625043SXin Long return false; 3854ea625043SXin Long switch (param.p->type) { 3855ea625043SXin Long case SCTP_PARAM_RESET_OUT_REQUEST: 3856ea625043SXin Long if (length < sizeof(struct sctp_strreset_outreq) || 3857ea625043SXin Long (last && last != SCTP_PARAM_RESET_RESPONSE && 3858ea625043SXin Long last != SCTP_PARAM_RESET_IN_REQUEST)) 3859ea625043SXin Long return false; 3860ea625043SXin Long break; 3861ea625043SXin Long case SCTP_PARAM_RESET_IN_REQUEST: 3862ea625043SXin Long if (length < sizeof(struct sctp_strreset_inreq) || 3863ea625043SXin Long (last && last != SCTP_PARAM_RESET_OUT_REQUEST)) 3864ea625043SXin Long return false; 3865ea625043SXin Long break; 3866ea625043SXin Long case SCTP_PARAM_RESET_RESPONSE: 3867ea625043SXin Long if ((length != sizeof(struct sctp_strreset_resp) && 3868ea625043SXin Long length != sizeof(struct sctp_strreset_resptsn)) || 3869ea625043SXin Long (last && last != SCTP_PARAM_RESET_RESPONSE && 3870ea625043SXin Long last != SCTP_PARAM_RESET_OUT_REQUEST)) 3871ea625043SXin Long return false; 3872ea625043SXin Long break; 3873ea625043SXin Long case SCTP_PARAM_RESET_TSN_REQUEST: 3874ea625043SXin Long if (length != 3875ea625043SXin Long sizeof(struct sctp_strreset_tsnreq) || last) 3876ea625043SXin Long return false; 3877ea625043SXin Long break; 3878ea625043SXin Long case SCTP_PARAM_RESET_ADD_IN_STREAMS: 3879ea625043SXin Long if (length != sizeof(struct sctp_strreset_addstrm) || 3880ea625043SXin Long (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS)) 3881ea625043SXin Long return false; 3882ea625043SXin Long break; 3883ea625043SXin Long case SCTP_PARAM_RESET_ADD_OUT_STREAMS: 3884ea625043SXin Long if (length != sizeof(struct sctp_strreset_addstrm) || 3885ea625043SXin Long (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS)) 3886ea625043SXin Long return false; 3887ea625043SXin Long break; 3888ea625043SXin Long default: 3889ea625043SXin Long return false; 3890ea625043SXin Long } 3891ea625043SXin Long 3892ea625043SXin Long last = param.p->type; 3893ea625043SXin Long } 3894ea625043SXin Long 3895ea625043SXin Long return true; 3896ea625043SXin Long } 3897