/* SCTP kernel reference Implementation
|
/* SCTP kernel reference Implementation
|
* (C) Copyright IBM Corp. 2001, 2003
|
* (C) Copyright IBM Corp. 2001, 2003
|
* Copyright (c) 1999-2000 Cisco, Inc.
|
* Copyright (c) 1999-2000 Cisco, Inc.
|
* Copyright (c) 1999-2001 Motorola, Inc.
|
* Copyright (c) 1999-2001 Motorola, Inc.
|
* Copyright (c) 2001-2002 Intel Corp.
|
* Copyright (c) 2001-2002 Intel Corp.
|
*
|
*
|
* This file is part of the SCTP kernel reference Implementation
|
* This file is part of the SCTP kernel reference Implementation
|
*
|
*
|
* This file includes part of the implementation of the add-IP extension,
|
* This file includes part of the implementation of the add-IP extension,
|
* based on <draft-ietf-tsvwg-addip-sctp-02.txt> June 29, 2001,
|
* based on <draft-ietf-tsvwg-addip-sctp-02.txt> June 29, 2001,
|
* for the SCTP kernel reference Implementation.
|
* for the SCTP kernel reference Implementation.
|
*
|
*
|
* These functions work with the state functions in sctp_sm_statefuns.c
|
* These functions work with the state functions in sctp_sm_statefuns.c
|
* to implement the state operations. These functions implement the
|
* to implement the state operations. These functions implement the
|
* steps which require modifying existing data structures.
|
* steps which require modifying existing data structures.
|
*
|
*
|
* The SCTP reference implementation is free software;
|
* The SCTP reference implementation is free software;
|
* you can redistribute it and/or modify it under the terms of
|
* you can redistribute it and/or modify it under the terms of
|
* the GNU General Public License as published by
|
* the GNU General Public License as published by
|
* the Free Software Foundation; either version 2, or (at your option)
|
* the Free Software Foundation; either version 2, or (at your option)
|
* any later version.
|
* any later version.
|
*
|
*
|
* The SCTP reference implementation is distributed in the hope that it
|
* The SCTP reference implementation is distributed in the hope that it
|
* will be useful, but WITHOUT ANY WARRANTY; without even the implied
|
* will be useful, but WITHOUT ANY WARRANTY; without even the implied
|
* ************************
|
* ************************
|
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
* See the GNU General Public License for more details.
|
* See the GNU General Public License for more details.
|
*
|
*
|
* You should have received a copy of the GNU General Public License
|
* You should have received a copy of the GNU General Public License
|
* along with GNU CC; see the file COPYING. If not, write to
|
* along with GNU CC; see the file COPYING. If not, write to
|
* the Free Software Foundation, 59 Temple Place - Suite 330,
|
* the Free Software Foundation, 59 Temple Place - Suite 330,
|
* Boston, MA 02111-1307, USA.
|
* Boston, MA 02111-1307, USA.
|
*
|
*
|
* Please send any bug reports or fixes you make to the
|
* Please send any bug reports or fixes you make to the
|
* email address(es):
|
* email address(es):
|
* lksctp developers <lksctp-developers@lists.sourceforge.net>
|
* lksctp developers <lksctp-developers@lists.sourceforge.net>
|
*
|
*
|
* Or submit a bug report through the following website:
|
* Or submit a bug report through the following website:
|
* http://www.sf.net/projects/lksctp
|
* http://www.sf.net/projects/lksctp
|
*
|
*
|
* Written or modified by:
|
* Written or modified by:
|
* La Monte H.P. Yarroll <piggy@acm.org>
|
* La Monte H.P. Yarroll <piggy@acm.org>
|
* Karl Knutson <karl@athena.chicago.il.us>
|
* Karl Knutson <karl@athena.chicago.il.us>
|
* C. Robin <chris@hundredacre.ac.uk>
|
* C. Robin <chris@hundredacre.ac.uk>
|
* Jon Grimm <jgrimm@us.ibm.com>
|
* Jon Grimm <jgrimm@us.ibm.com>
|
* Xingang Guo <xingang.guo@intel.com>
|
* Xingang Guo <xingang.guo@intel.com>
|
* Dajiang Zhang <dajiang.zhang@nokia.com>
|
* Dajiang Zhang <dajiang.zhang@nokia.com>
|
* Sridhar Samudrala <sri@us.ibm.com>
|
* Sridhar Samudrala <sri@us.ibm.com>
|
* Daisy Chang <daisyc@us.ibm.com>
|
* Daisy Chang <daisyc@us.ibm.com>
|
* Ardelle Fan <ardelle.fan@intel.com>
|
* Ardelle Fan <ardelle.fan@intel.com>
|
* Kevin Gao <kevin.gao@intel.com>
|
* Kevin Gao <kevin.gao@intel.com>
|
*
|
*
|
* Any bugs reported given to us we will try to fix... any fixes shared will
|
* Any bugs reported given to us we will try to fix... any fixes shared will
|
* be incorporated into the next SCTP release.
|
* be incorporated into the next SCTP release.
|
*/
|
*/
|
|
|
#include <linux/types.h>
|
#include <linux/types.h>
|
#include <linux/kernel.h>
|
#include <linux/kernel.h>
|
#include <linux/ip.h>
|
#include <linux/ip.h>
|
#include <linux/ipv6.h>
|
#include <linux/ipv6.h>
|
#include <linux/net.h>
|
#include <linux/net.h>
|
#include <linux/inet.h>
|
#include <linux/inet.h>
|
#include <asm/scatterlist.h>
|
#include <asm/scatterlist.h>
|
#include <linux/crypto.h>
|
#include <linux/crypto.h>
|
#include <net/sock.h>
|
#include <net/sock.h>
|
|
|
#include <linux/skbuff.h>
|
#include <linux/skbuff.h>
|
#include <linux/random.h> /* for get_random_bytes */
|
#include <linux/random.h> /* for get_random_bytes */
|
#include <net/sctp/sctp.h>
|
#include <net/sctp/sctp.h>
|
#include <net/sctp/sm.h>
|
#include <net/sctp/sm.h>
|
|
|
extern kmem_cache_t *sctp_chunk_cachep;
|
extern kmem_cache_t *sctp_chunk_cachep;
|
|
|
/* What was the inbound interface for this chunk? */
|
/* What was the inbound interface for this chunk? */
|
int sctp_chunk_iif(const struct sctp_chunk *chunk)
|
int sctp_chunk_iif(const struct sctp_chunk *chunk)
|
{
|
{
|
struct sctp_af *af;
|
struct sctp_af *af;
|
int iif = 0;
|
int iif = 0;
|
|
|
af = sctp_get_af_specific(ipver2af(chunk->skb->nh.iph->version));
|
af = sctp_get_af_specific(ipver2af(chunk->skb->nh.iph->version));
|
if (af)
|
if (af)
|
iif = af->skb_iif(chunk->skb);
|
iif = af->skb_iif(chunk->skb);
|
|
|
return iif;
|
return iif;
|
}
|
}
|
|
|
/* RFC 2960 3.3.2 Initiation (INIT) (1)
|
/* RFC 2960 3.3.2 Initiation (INIT) (1)
|
*
|
*
|
* Note 2: The ECN capable field is reserved for future use of
|
* Note 2: The ECN capable field is reserved for future use of
|
* Explicit Congestion Notification.
|
* Explicit Congestion Notification.
|
*/
|
*/
|
static const sctp_ecn_capable_param_t ecap_param = {
|
static const sctp_ecn_capable_param_t ecap_param = {
|
{
|
{
|
SCTP_PARAM_ECN_CAPABLE,
|
SCTP_PARAM_ECN_CAPABLE,
|
__constant_htons(sizeof(sctp_ecn_capable_param_t)),
|
__constant_htons(sizeof(sctp_ecn_capable_param_t)),
|
}
|
}
|
};
|
};
|
|
|
/* A helper to initialize to initialize an op error inside a
|
/* A helper to initialize to initialize an op error inside a
|
* provided chunk, as most cause codes will be embedded inside an
|
* provided chunk, as most cause codes will be embedded inside an
|
* abort chunk.
|
* abort chunk.
|
*/
|
*/
|
void sctp_init_cause(struct sctp_chunk *chunk, __u16 cause_code,
|
void sctp_init_cause(struct sctp_chunk *chunk, __u16 cause_code,
|
const void *payload, size_t paylen)
|
const void *payload, size_t paylen)
|
{
|
{
|
sctp_errhdr_t err;
|
sctp_errhdr_t err;
|
int padlen;
|
int padlen;
|
__u16 len;
|
__u16 len;
|
|
|
/* Cause code constants are now defined in network order. */
|
/* Cause code constants are now defined in network order. */
|
err.cause = cause_code;
|
err.cause = cause_code;
|
len = sizeof(sctp_errhdr_t) + paylen;
|
len = sizeof(sctp_errhdr_t) + paylen;
|
padlen = len % 4;
|
padlen = len % 4;
|
err.length = htons(len);
|
err.length = htons(len);
|
len += padlen;
|
len += padlen;
|
sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
|
sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
|
chunk->subh.err_hdr = sctp_addto_chunk(chunk, paylen, payload);
|
chunk->subh.err_hdr = sctp_addto_chunk(chunk, paylen, payload);
|
}
|
}
|
|
|
/* 3.3.2 Initiation (INIT) (1)
|
/* 3.3.2 Initiation (INIT) (1)
|
*
|
*
|
* This chunk is used to initiate a SCTP association between two
|
* This chunk is used to initiate a SCTP association between two
|
* endpoints. The format of the INIT chunk is shown below:
|
* endpoints. The format of the INIT chunk is shown below:
|
*
|
*
|
* 0 1 2 3
|
* 0 1 2 3
|
* 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
|
* 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
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Type = 1 | Chunk Flags | Chunk Length |
|
* | Type = 1 | Chunk Flags | Chunk Length |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Initiate Tag |
|
* | Initiate Tag |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Advertised Receiver Window Credit (a_rwnd) |
|
* | Advertised Receiver Window Credit (a_rwnd) |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Number of Outbound Streams | Number of Inbound Streams |
|
* | Number of Outbound Streams | Number of Inbound Streams |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Initial TSN |
|
* | Initial TSN |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* \ \
|
* \ \
|
* / Optional/Variable-Length Parameters /
|
* / Optional/Variable-Length Parameters /
|
* \ \
|
* \ \
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
*
|
*
|
*
|
*
|
* The INIT chunk contains the following parameters. Unless otherwise
|
* The INIT chunk contains the following parameters. Unless otherwise
|
* noted, each parameter MUST only be included once in the INIT chunk.
|
* noted, each parameter MUST only be included once in the INIT chunk.
|
*
|
*
|
* Fixed Parameters Status
|
* Fixed Parameters Status
|
* ----------------------------------------------
|
* ----------------------------------------------
|
* Initiate Tag Mandatory
|
* Initiate Tag Mandatory
|
* Advertised Receiver Window Credit Mandatory
|
* Advertised Receiver Window Credit Mandatory
|
* Number of Outbound Streams Mandatory
|
* Number of Outbound Streams Mandatory
|
* Number of Inbound Streams Mandatory
|
* Number of Inbound Streams Mandatory
|
* Initial TSN Mandatory
|
* Initial TSN Mandatory
|
*
|
*
|
* Variable Parameters Status Type Value
|
* Variable Parameters Status Type Value
|
* -------------------------------------------------------------
|
* -------------------------------------------------------------
|
* IPv4 Address (Note 1) Optional 5
|
* IPv4 Address (Note 1) Optional 5
|
* IPv6 Address (Note 1) Optional 6
|
* IPv6 Address (Note 1) Optional 6
|
* Cookie Preservative Optional 9
|
* Cookie Preservative Optional 9
|
* Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
|
* Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
|
* Host Name Address (Note 3) Optional 11
|
* Host Name Address (Note 3) Optional 11
|
* Supported Address Types (Note 4) Optional 12
|
* Supported Address Types (Note 4) Optional 12
|
*/
|
*/
|
struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
|
const struct sctp_bind_addr *bp,
|
const struct sctp_bind_addr *bp,
|
int gfp, int vparam_len)
|
int gfp, int vparam_len)
|
{
|
{
|
sctp_inithdr_t init;
|
sctp_inithdr_t init;
|
union sctp_params addrs;
|
union sctp_params addrs;
|
size_t chunksize;
|
size_t chunksize;
|
struct sctp_chunk *retval = NULL;
|
struct sctp_chunk *retval = NULL;
|
int num_types, addrs_len = 0;
|
int num_types, addrs_len = 0;
|
struct sctp_opt *sp;
|
struct sctp_opt *sp;
|
sctp_supported_addrs_param_t sat;
|
sctp_supported_addrs_param_t sat;
|
__u16 types[2];
|
__u16 types[2];
|
|
|
/* RFC 2960 3.3.2 Initiation (INIT) (1)
|
/* RFC 2960 3.3.2 Initiation (INIT) (1)
|
*
|
*
|
* Note 1: The INIT chunks can contain multiple addresses that
|
* Note 1: The INIT chunks can contain multiple addresses that
|
* can be IPv4 and/or IPv6 in any combination.
|
* can be IPv4 and/or IPv6 in any combination.
|
*/
|
*/
|
retval = NULL;
|
retval = NULL;
|
|
|
/* Convert the provided bind address list to raw format. */
|
/* Convert the provided bind address list to raw format. */
|
addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
|
addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
|
|
|
init.init_tag = htonl(asoc->c.my_vtag);
|
init.init_tag = htonl(asoc->c.my_vtag);
|
init.a_rwnd = htonl(asoc->rwnd);
|
init.a_rwnd = htonl(asoc->rwnd);
|
init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
|
init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
|
init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
|
init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
|
init.initial_tsn = htonl(asoc->c.initial_tsn);
|
init.initial_tsn = htonl(asoc->c.initial_tsn);
|
|
|
/* How many address types are needed? */
|
/* How many address types are needed? */
|
sp = sctp_sk(asoc->base.sk);
|
sp = sctp_sk(asoc->base.sk);
|
num_types = sp->pf->supported_addrs(sp, types);
|
num_types = sp->pf->supported_addrs(sp, types);
|
|
|
chunksize = sizeof(init) + addrs_len + SCTP_SAT_LEN(num_types);
|
chunksize = sizeof(init) + addrs_len + SCTP_SAT_LEN(num_types);
|
chunksize += sizeof(ecap_param);
|
chunksize += sizeof(ecap_param);
|
chunksize += vparam_len;
|
chunksize += vparam_len;
|
|
|
/* RFC 2960 3.3.2 Initiation (INIT) (1)
|
/* RFC 2960 3.3.2 Initiation (INIT) (1)
|
*
|
*
|
* Note 3: An INIT chunk MUST NOT contain more than one Host
|
* Note 3: An INIT chunk MUST NOT contain more than one Host
|
* Name address parameter. Moreover, the sender of the INIT
|
* Name address parameter. Moreover, the sender of the INIT
|
* MUST NOT combine any other address types with the Host Name
|
* MUST NOT combine any other address types with the Host Name
|
* address in the INIT. The receiver of INIT MUST ignore any
|
* address in the INIT. The receiver of INIT MUST ignore any
|
* other address types if the Host Name address parameter is
|
* other address types if the Host Name address parameter is
|
* present in the received INIT chunk.
|
* present in the received INIT chunk.
|
*
|
*
|
* PLEASE DO NOT FIXME [This version does not support Host Name.]
|
* PLEASE DO NOT FIXME [This version does not support Host Name.]
|
*/
|
*/
|
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize);
|
retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize);
|
if (!retval)
|
if (!retval)
|
goto nodata;
|
goto nodata;
|
|
|
retval->subh.init_hdr =
|
retval->subh.init_hdr =
|
sctp_addto_chunk(retval, sizeof(init), &init);
|
sctp_addto_chunk(retval, sizeof(init), &init);
|
retval->param_hdr.v =
|
retval->param_hdr.v =
|
sctp_addto_chunk(retval, addrs_len, addrs.v);
|
sctp_addto_chunk(retval, addrs_len, addrs.v);
|
|
|
/* RFC 2960 3.3.2 Initiation (INIT) (1)
|
/* RFC 2960 3.3.2 Initiation (INIT) (1)
|
*
|
*
|
* Note 4: This parameter, when present, specifies all the
|
* Note 4: This parameter, when present, specifies all the
|
* address types the sending endpoint can support. The absence
|
* address types the sending endpoint can support. The absence
|
* of this parameter indicates that the sending endpoint can
|
* of this parameter indicates that the sending endpoint can
|
* support any address type.
|
* support any address type.
|
*/
|
*/
|
sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
|
sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
|
sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
|
sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
|
sctp_addto_chunk(retval, sizeof(sat), &sat);
|
sctp_addto_chunk(retval, sizeof(sat), &sat);
|
sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
|
sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
|
|
|
sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
|
sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
|
nodata:
|
nodata:
|
if (addrs.v)
|
if (addrs.v)
|
kfree(addrs.v);
|
kfree(addrs.v);
|
return retval;
|
return retval;
|
}
|
}
|
|
|
struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
|
const struct sctp_chunk *chunk,
|
const struct sctp_chunk *chunk,
|
int gfp, int unkparam_len)
|
int gfp, int unkparam_len)
|
{
|
{
|
sctp_inithdr_t initack;
|
sctp_inithdr_t initack;
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
union sctp_params addrs;
|
union sctp_params addrs;
|
int addrs_len;
|
int addrs_len;
|
sctp_cookie_param_t *cookie;
|
sctp_cookie_param_t *cookie;
|
int cookie_len;
|
int cookie_len;
|
size_t chunksize;
|
size_t chunksize;
|
|
|
retval = NULL;
|
retval = NULL;
|
|
|
/* Note: there may be no addresses to embed. */
|
/* Note: there may be no addresses to embed. */
|
addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
|
addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
|
|
|
initack.init_tag = htonl(asoc->c.my_vtag);
|
initack.init_tag = htonl(asoc->c.my_vtag);
|
initack.a_rwnd = htonl(asoc->rwnd);
|
initack.a_rwnd = htonl(asoc->rwnd);
|
initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
|
initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
|
initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
|
initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
|
initack.initial_tsn = htonl(asoc->c.initial_tsn);
|
initack.initial_tsn = htonl(asoc->c.initial_tsn);
|
|
|
/* FIXME: We really ought to build the cookie right
|
/* FIXME: We really ought to build the cookie right
|
* into the packet instead of allocating more fresh memory.
|
* into the packet instead of allocating more fresh memory.
|
*/
|
*/
|
cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
|
cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
|
addrs.v, addrs_len);
|
addrs.v, addrs_len);
|
if (!cookie)
|
if (!cookie)
|
goto nomem_cookie;
|
goto nomem_cookie;
|
|
|
/* Calculate the total size of allocation, include the reserved
|
/* Calculate the total size of allocation, include the reserved
|
* space for reporting unknown parameters if it is specified.
|
* space for reporting unknown parameters if it is specified.
|
*/
|
*/
|
chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
|
chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
|
|
|
/* Tell peer that we'll do ECN only if peer advertised such cap. */
|
/* Tell peer that we'll do ECN only if peer advertised such cap. */
|
if (asoc->peer.ecn_capable)
|
if (asoc->peer.ecn_capable)
|
chunksize += sizeof(ecap_param);
|
chunksize += sizeof(ecap_param);
|
|
|
/* Now allocate and fill out the chunk. */
|
/* Now allocate and fill out the chunk. */
|
retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize);
|
retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize);
|
if (!retval)
|
if (!retval)
|
goto nomem_chunk;
|
goto nomem_chunk;
|
|
|
/* Per the advice in RFC 2960 6.4, send this reply to
|
/* Per the advice in RFC 2960 6.4, send this reply to
|
* the source of the INIT packet.
|
* the source of the INIT packet.
|
*/
|
*/
|
retval->transport = chunk->transport;
|
retval->transport = chunk->transport;
|
retval->subh.init_hdr =
|
retval->subh.init_hdr =
|
sctp_addto_chunk(retval, sizeof(initack), &initack);
|
sctp_addto_chunk(retval, sizeof(initack), &initack);
|
retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
|
retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
|
sctp_addto_chunk(retval, cookie_len, cookie);
|
sctp_addto_chunk(retval, cookie_len, cookie);
|
if (asoc->peer.ecn_capable)
|
if (asoc->peer.ecn_capable)
|
sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
|
sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
|
|
|
/* We need to remove the const qualifier at this point. */
|
/* We need to remove the const qualifier at this point. */
|
retval->asoc = (struct sctp_association *) asoc;
|
retval->asoc = (struct sctp_association *) asoc;
|
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
*
|
*
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* address from which it received the DATA or control chunk
|
* address from which it received the DATA or control chunk
|
* to which it is replying.
|
* to which it is replying.
|
*
|
*
|
* [INIT ACK back to where the INIT came from.]
|
* [INIT ACK back to where the INIT came from.]
|
*/
|
*/
|
if (chunk)
|
if (chunk)
|
retval->transport = chunk->transport;
|
retval->transport = chunk->transport;
|
|
|
nomem_chunk:
|
nomem_chunk:
|
kfree(cookie);
|
kfree(cookie);
|
nomem_cookie:
|
nomem_cookie:
|
if (addrs.v)
|
if (addrs.v)
|
kfree(addrs.v);
|
kfree(addrs.v);
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
|
/* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
|
*
|
*
|
* This chunk is used only during the initialization of an association.
|
* This chunk is used only during the initialization of an association.
|
* It is sent by the initiator of an association to its peer to complete
|
* It is sent by the initiator of an association to its peer to complete
|
* the initialization process. This chunk MUST precede any DATA chunk
|
* the initialization process. This chunk MUST precede any DATA chunk
|
* sent within the association, but MAY be bundled with one or more DATA
|
* sent within the association, but MAY be bundled with one or more DATA
|
* chunks in the same packet.
|
* chunks in the same packet.
|
*
|
*
|
* 0 1 2 3
|
* 0 1 2 3
|
* 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
|
* 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
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Type = 10 |Chunk Flags | Length |
|
* | Type = 10 |Chunk Flags | Length |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* / Cookie /
|
* / Cookie /
|
* \ \
|
* \ \
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
*
|
*
|
* Chunk Flags: 8 bit
|
* Chunk Flags: 8 bit
|
*
|
*
|
* Set to zero on transmit and ignored on receipt.
|
* Set to zero on transmit and ignored on receipt.
|
*
|
*
|
* Length: 16 bits (unsigned integer)
|
* Length: 16 bits (unsigned integer)
|
*
|
*
|
* Set to the size of the chunk in bytes, including the 4 bytes of
|
* Set to the size of the chunk in bytes, including the 4 bytes of
|
* the chunk header and the size of the Cookie.
|
* the chunk header and the size of the Cookie.
|
*
|
*
|
* Cookie: variable size
|
* Cookie: variable size
|
*
|
*
|
* This field must contain the exact cookie received in the
|
* This field must contain the exact cookie received in the
|
* State Cookie parameter from the previous INIT ACK.
|
* State Cookie parameter from the previous INIT ACK.
|
*
|
*
|
* An implementation SHOULD make the cookie as small as possible
|
* An implementation SHOULD make the cookie as small as possible
|
* to insure interoperability.
|
* to insure interoperability.
|
*/
|
*/
|
struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
|
const struct sctp_chunk *chunk)
|
const struct sctp_chunk *chunk)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
void *cookie;
|
void *cookie;
|
int cookie_len;
|
int cookie_len;
|
|
|
cookie = asoc->peer.cookie;
|
cookie = asoc->peer.cookie;
|
cookie_len = asoc->peer.cookie_len;
|
cookie_len = asoc->peer.cookie_len;
|
|
|
/* Build a cookie echo chunk. */
|
/* Build a cookie echo chunk. */
|
retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len);
|
retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len);
|
if (!retval)
|
if (!retval)
|
goto nodata;
|
goto nodata;
|
retval->subh.cookie_hdr =
|
retval->subh.cookie_hdr =
|
sctp_addto_chunk(retval, cookie_len, cookie);
|
sctp_addto_chunk(retval, cookie_len, cookie);
|
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
*
|
*
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* address from which it * received the DATA or control chunk
|
* address from which it * received the DATA or control chunk
|
* to which it is replying.
|
* to which it is replying.
|
*
|
*
|
* [COOKIE ECHO back to where the INIT ACK came from.]
|
* [COOKIE ECHO back to where the INIT ACK came from.]
|
*/
|
*/
|
if (chunk)
|
if (chunk)
|
retval->transport = chunk->transport;
|
retval->transport = chunk->transport;
|
|
|
nodata:
|
nodata:
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
|
/* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
|
*
|
*
|
* This chunk is used only during the initialization of an
|
* This chunk is used only during the initialization of an
|
* association. It is used to acknowledge the receipt of a COOKIE
|
* association. It is used to acknowledge the receipt of a COOKIE
|
* ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
|
* ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
|
* within the association, but MAY be bundled with one or more DATA
|
* within the association, but MAY be bundled with one or more DATA
|
* chunks or SACK chunk in the same SCTP packet.
|
* chunks or SACK chunk in the same SCTP packet.
|
*
|
*
|
* 0 1 2 3
|
* 0 1 2 3
|
* 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
|
* 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
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Type = 11 |Chunk Flags | Length = 4 |
|
* | Type = 11 |Chunk Flags | Length = 4 |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
*
|
*
|
* Chunk Flags: 8 bits
|
* Chunk Flags: 8 bits
|
*
|
*
|
* Set to zero on transmit and ignored on receipt.
|
* Set to zero on transmit and ignored on receipt.
|
*/
|
*/
|
struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
|
const struct sctp_chunk *chunk)
|
const struct sctp_chunk *chunk)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0);
|
retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0);
|
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
*
|
*
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* address from which it * received the DATA or control chunk
|
* address from which it * received the DATA or control chunk
|
* to which it is replying.
|
* to which it is replying.
|
*
|
*
|
* [COOKIE ACK back to where the COOKIE ECHO came from.]
|
* [COOKIE ACK back to where the COOKIE ECHO came from.]
|
*/
|
*/
|
if (retval && chunk)
|
if (retval && chunk)
|
retval->transport = chunk->transport;
|
retval->transport = chunk->transport;
|
|
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/*
|
/*
|
* Appendix A: Explicit Congestion Notification:
|
* Appendix A: Explicit Congestion Notification:
|
* CWR:
|
* CWR:
|
*
|
*
|
* RFC 2481 details a specific bit for a sender to send in the header of
|
* RFC 2481 details a specific bit for a sender to send in the header of
|
* its next outbound TCP segment to indicate to its peer that it has
|
* its next outbound TCP segment to indicate to its peer that it has
|
* reduced its congestion window. This is termed the CWR bit. For
|
* reduced its congestion window. This is termed the CWR bit. For
|
* SCTP the same indication is made by including the CWR chunk.
|
* SCTP the same indication is made by including the CWR chunk.
|
* This chunk contains one data element, i.e. the TSN number that
|
* This chunk contains one data element, i.e. the TSN number that
|
* was sent in the ECNE chunk. This element represents the lowest
|
* was sent in the ECNE chunk. This element represents the lowest
|
* TSN number in the datagram that was originally marked with the
|
* TSN number in the datagram that was originally marked with the
|
* CE bit.
|
* CE bit.
|
*
|
*
|
* 0 1 2 3
|
* 0 1 2 3
|
* 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
|
* 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
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
|
* | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Lowest TSN Number |
|
* | Lowest TSN Number |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
*
|
*
|
* Note: The CWR is considered a Control chunk.
|
* Note: The CWR is considered a Control chunk.
|
*/
|
*/
|
struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
|
const __u32 lowest_tsn,
|
const __u32 lowest_tsn,
|
const struct sctp_chunk *chunk)
|
const struct sctp_chunk *chunk)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
sctp_cwrhdr_t cwr;
|
sctp_cwrhdr_t cwr;
|
|
|
cwr.lowest_tsn = htonl(lowest_tsn);
|
cwr.lowest_tsn = htonl(lowest_tsn);
|
retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0,
|
retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0,
|
sizeof(sctp_cwrhdr_t));
|
sizeof(sctp_cwrhdr_t));
|
|
|
if (!retval)
|
if (!retval)
|
goto nodata;
|
goto nodata;
|
|
|
retval->subh.ecn_cwr_hdr =
|
retval->subh.ecn_cwr_hdr =
|
sctp_addto_chunk(retval, sizeof(cwr), &cwr);
|
sctp_addto_chunk(retval, sizeof(cwr), &cwr);
|
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
*
|
*
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* address from which it * received the DATA or control chunk
|
* address from which it * received the DATA or control chunk
|
* to which it is replying.
|
* to which it is replying.
|
*
|
*
|
* [Report a reduced congestion window back to where the ECNE
|
* [Report a reduced congestion window back to where the ECNE
|
* came from.]
|
* came from.]
|
*/
|
*/
|
if (chunk)
|
if (chunk)
|
retval->transport = chunk->transport;
|
retval->transport = chunk->transport;
|
|
|
nodata:
|
nodata:
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Make an ECNE chunk. This is a congestion experienced report. */
|
/* Make an ECNE chunk. This is a congestion experienced report. */
|
struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
|
const __u32 lowest_tsn)
|
const __u32 lowest_tsn)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
sctp_ecnehdr_t ecne;
|
sctp_ecnehdr_t ecne;
|
|
|
ecne.lowest_tsn = htonl(lowest_tsn);
|
ecne.lowest_tsn = htonl(lowest_tsn);
|
retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0,
|
retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0,
|
sizeof(sctp_ecnehdr_t));
|
sizeof(sctp_ecnehdr_t));
|
if (!retval)
|
if (!retval)
|
goto nodata;
|
goto nodata;
|
retval->subh.ecne_hdr =
|
retval->subh.ecne_hdr =
|
sctp_addto_chunk(retval, sizeof(ecne), &ecne);
|
sctp_addto_chunk(retval, sizeof(ecne), &ecne);
|
|
|
nodata:
|
nodata:
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Make a DATA chunk for the given association from the provided
|
/* Make a DATA chunk for the given association from the provided
|
* parameters. However, do not populate the data payload.
|
* parameters. However, do not populate the data payload.
|
*/
|
*/
|
struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
|
const struct sctp_sndrcvinfo *sinfo,
|
const struct sctp_sndrcvinfo *sinfo,
|
int data_len, __u8 flags, __u16 ssn)
|
int data_len, __u8 flags, __u16 ssn)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
struct sctp_datahdr dp;
|
struct sctp_datahdr dp;
|
int chunk_len;
|
int chunk_len;
|
|
|
/* We assign the TSN as LATE as possible, not here when
|
/* We assign the TSN as LATE as possible, not here when
|
* creating the chunk.
|
* creating the chunk.
|
*/
|
*/
|
dp.tsn = 0;
|
dp.tsn = 0;
|
dp.stream = htons(sinfo->sinfo_stream);
|
dp.stream = htons(sinfo->sinfo_stream);
|
dp.ppid = sinfo->sinfo_ppid;
|
dp.ppid = sinfo->sinfo_ppid;
|
|
|
/* Set the flags for an unordered send. */
|
/* Set the flags for an unordered send. */
|
if (sinfo->sinfo_flags & MSG_UNORDERED) {
|
if (sinfo->sinfo_flags & MSG_UNORDERED) {
|
flags |= SCTP_DATA_UNORDERED;
|
flags |= SCTP_DATA_UNORDERED;
|
dp.ssn = 0;
|
dp.ssn = 0;
|
} else
|
} else
|
dp.ssn = htons(ssn);
|
dp.ssn = htons(ssn);
|
|
|
chunk_len = sizeof(dp) + data_len;
|
chunk_len = sizeof(dp) + data_len;
|
retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len);
|
retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len);
|
if (!retval)
|
if (!retval)
|
goto nodata;
|
goto nodata;
|
|
|
retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
|
retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
|
memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
|
memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
|
|
|
nodata:
|
nodata:
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Make a DATA chunk for the given association. Populate the data
|
/* Make a DATA chunk for the given association. Populate the data
|
* payload.
|
* payload.
|
*/
|
*/
|
struct sctp_chunk *sctp_make_datafrag(struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_datafrag(struct sctp_association *asoc,
|
const struct sctp_sndrcvinfo *sinfo,
|
const struct sctp_sndrcvinfo *sinfo,
|
int data_len, const __u8 *data,
|
int data_len, const __u8 *data,
|
__u8 flags, __u16 ssn)
|
__u8 flags, __u16 ssn)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
|
|
retval = sctp_make_datafrag_empty(asoc, sinfo, data_len, flags, ssn);
|
retval = sctp_make_datafrag_empty(asoc, sinfo, data_len, flags, ssn);
|
if (retval)
|
if (retval)
|
sctp_addto_chunk(retval, data_len, data);
|
sctp_addto_chunk(retval, data_len, data);
|
|
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Make a DATA chunk for the given association to ride on stream id
|
/* Make a DATA chunk for the given association to ride on stream id
|
* 'stream', with a payload id of 'payload', and a body of 'data'.
|
* 'stream', with a payload id of 'payload', and a body of 'data'.
|
*/
|
*/
|
struct sctp_chunk *sctp_make_data(struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_data(struct sctp_association *asoc,
|
const struct sctp_sndrcvinfo *sinfo,
|
const struct sctp_sndrcvinfo *sinfo,
|
int data_len, const __u8 *data)
|
int data_len, const __u8 *data)
|
{
|
{
|
struct sctp_chunk *retval = NULL;
|
struct sctp_chunk *retval = NULL;
|
|
|
retval = sctp_make_data_empty(asoc, sinfo, data_len);
|
retval = sctp_make_data_empty(asoc, sinfo, data_len);
|
if (retval)
|
if (retval)
|
sctp_addto_chunk(retval, data_len, data);
|
sctp_addto_chunk(retval, data_len, data);
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Make a DATA chunk for the given association to ride on stream id
|
/* Make a DATA chunk for the given association to ride on stream id
|
* 'stream', with a payload id of 'payload', and a body big enough to
|
* 'stream', with a payload id of 'payload', and a body big enough to
|
* hold 'data_len' octets of data. We use this version when we need
|
* hold 'data_len' octets of data. We use this version when we need
|
* to build the message AFTER allocating memory.
|
* to build the message AFTER allocating memory.
|
*/
|
*/
|
struct sctp_chunk *sctp_make_data_empty(struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_data_empty(struct sctp_association *asoc,
|
const struct sctp_sndrcvinfo *sinfo,
|
const struct sctp_sndrcvinfo *sinfo,
|
int data_len)
|
int data_len)
|
{
|
{
|
__u8 flags = SCTP_DATA_NOT_FRAG;
|
__u8 flags = SCTP_DATA_NOT_FRAG;
|
|
|
return sctp_make_datafrag_empty(asoc, sinfo, data_len, flags, 0);
|
return sctp_make_datafrag_empty(asoc, sinfo, data_len, flags, 0);
|
}
|
}
|
|
|
/* Create a selective ackowledgement (SACK) for the given
|
/* Create a selective ackowledgement (SACK) for the given
|
* association. This reports on which TSN's we've seen to date,
|
* association. This reports on which TSN's we've seen to date,
|
* including duplicates and gaps.
|
* including duplicates and gaps.
|
*/
|
*/
|
struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
|
struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
struct sctp_sackhdr sack;
|
struct sctp_sackhdr sack;
|
int len;
|
int len;
|
__u32 ctsn;
|
__u32 ctsn;
|
__u16 num_gabs, num_dup_tsns;
|
__u16 num_gabs, num_dup_tsns;
|
struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
|
struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
|
|
|
ctsn = sctp_tsnmap_get_ctsn(map);
|
ctsn = sctp_tsnmap_get_ctsn(map);
|
SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn);
|
SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn);
|
|
|
/* How much room is needed in the chunk? */
|
/* How much room is needed in the chunk? */
|
num_gabs = sctp_tsnmap_num_gabs(map);
|
num_gabs = sctp_tsnmap_num_gabs(map);
|
num_dup_tsns = sctp_tsnmap_num_dups(map);
|
num_dup_tsns = sctp_tsnmap_num_dups(map);
|
|
|
/* Initialize the SACK header. */
|
/* Initialize the SACK header. */
|
sack.cum_tsn_ack = htonl(ctsn);
|
sack.cum_tsn_ack = htonl(ctsn);
|
sack.a_rwnd = htonl(asoc->a_rwnd);
|
sack.a_rwnd = htonl(asoc->a_rwnd);
|
sack.num_gap_ack_blocks = htons(num_gabs);
|
sack.num_gap_ack_blocks = htons(num_gabs);
|
sack.num_dup_tsns = htons(num_dup_tsns);
|
sack.num_dup_tsns = htons(num_dup_tsns);
|
|
|
len = sizeof(sack)
|
len = sizeof(sack)
|
+ sizeof(struct sctp_gap_ack_block) * num_gabs
|
+ sizeof(struct sctp_gap_ack_block) * num_gabs
|
+ sizeof(__u32) * num_dup_tsns;
|
+ sizeof(__u32) * num_dup_tsns;
|
|
|
/* Create the chunk. */
|
/* Create the chunk. */
|
retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len);
|
retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len);
|
if (!retval)
|
if (!retval)
|
goto nodata;
|
goto nodata;
|
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
*
|
*
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* HEARTBEAT ACK, etc.) to the same destination transport
|
* HEARTBEAT ACK, etc.) to the same destination transport
|
* address from which it received the DATA or control chunk to
|
* address from which it received the DATA or control chunk to
|
* which it is replying. This rule should also be followed if
|
* which it is replying. This rule should also be followed if
|
* the endpoint is bundling DATA chunks together with the
|
* the endpoint is bundling DATA chunks together with the
|
* reply chunk.
|
* reply chunk.
|
*
|
*
|
* However, when acknowledging multiple DATA chunks received
|
* However, when acknowledging multiple DATA chunks received
|
* in packets from different source addresses in a single
|
* in packets from different source addresses in a single
|
* SACK, the SACK chunk may be transmitted to one of the
|
* SACK, the SACK chunk may be transmitted to one of the
|
* destination transport addresses from which the DATA or
|
* destination transport addresses from which the DATA or
|
* control chunks being acknowledged were received.
|
* control chunks being acknowledged were received.
|
*
|
*
|
* [BUG: We do not implement the following paragraph.
|
* [BUG: We do not implement the following paragraph.
|
* Perhaps we should remember the last transport we used for a
|
* Perhaps we should remember the last transport we used for a
|
* SACK and avoid that (if possible) if we have seen any
|
* SACK and avoid that (if possible) if we have seen any
|
* duplicates. --piggy]
|
* duplicates. --piggy]
|
*
|
*
|
* When a receiver of a duplicate DATA chunk sends a SACK to a
|
* When a receiver of a duplicate DATA chunk sends a SACK to a
|
* multi- homed endpoint it MAY be beneficial to vary the
|
* multi- homed endpoint it MAY be beneficial to vary the
|
* destination address and not use the source address of the
|
* destination address and not use the source address of the
|
* DATA chunk. The reason being that receiving a duplicate
|
* DATA chunk. The reason being that receiving a duplicate
|
* from a multi-homed endpoint might indicate that the return
|
* from a multi-homed endpoint might indicate that the return
|
* path (as specified in the source address of the DATA chunk)
|
* path (as specified in the source address of the DATA chunk)
|
* for the SACK is broken.
|
* for the SACK is broken.
|
*
|
*
|
* [Send to the address from which we last received a DATA chunk.]
|
* [Send to the address from which we last received a DATA chunk.]
|
*/
|
*/
|
retval->transport = asoc->peer.last_data_from;
|
retval->transport = asoc->peer.last_data_from;
|
|
|
retval->subh.sack_hdr =
|
retval->subh.sack_hdr =
|
sctp_addto_chunk(retval, sizeof(sack), &sack);
|
sctp_addto_chunk(retval, sizeof(sack), &sack);
|
|
|
/* Add the gap ack block information. */
|
/* Add the gap ack block information. */
|
if (num_gabs)
|
if (num_gabs)
|
sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
|
sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
|
sctp_tsnmap_get_gabs(map));
|
sctp_tsnmap_get_gabs(map));
|
|
|
/* Add the duplicate TSN information. */
|
/* Add the duplicate TSN information. */
|
if (num_dup_tsns)
|
if (num_dup_tsns)
|
sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
|
sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
|
sctp_tsnmap_get_dups(map));
|
sctp_tsnmap_get_dups(map));
|
|
|
nodata:
|
nodata:
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Make a SHUTDOWN chunk. */
|
/* Make a SHUTDOWN chunk. */
|
struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
|
const struct sctp_chunk *chunk)
|
const struct sctp_chunk *chunk)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
sctp_shutdownhdr_t shut;
|
sctp_shutdownhdr_t shut;
|
__u32 ctsn;
|
__u32 ctsn;
|
|
|
ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
|
ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
|
shut.cum_tsn_ack = htonl(ctsn);
|
shut.cum_tsn_ack = htonl(ctsn);
|
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0,
|
retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0,
|
sizeof(sctp_shutdownhdr_t));
|
sizeof(sctp_shutdownhdr_t));
|
if (!retval)
|
if (!retval)
|
goto nodata;
|
goto nodata;
|
|
|
retval->subh.shutdown_hdr =
|
retval->subh.shutdown_hdr =
|
sctp_addto_chunk(retval, sizeof(shut), &shut);
|
sctp_addto_chunk(retval, sizeof(shut), &shut);
|
|
|
if (chunk)
|
if (chunk)
|
retval->transport = chunk->transport;
|
retval->transport = chunk->transport;
|
nodata:
|
nodata:
|
return retval;
|
return retval;
|
}
|
}
|
|
|
struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
|
const struct sctp_chunk *chunk)
|
const struct sctp_chunk *chunk)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0);
|
retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0);
|
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
*
|
*
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* address from which it * received the DATA or control chunk
|
* address from which it * received the DATA or control chunk
|
* to which it is replying.
|
* to which it is replying.
|
*
|
*
|
* [ACK back to where the SHUTDOWN came from.]
|
* [ACK back to where the SHUTDOWN came from.]
|
*/
|
*/
|
if (retval && chunk)
|
if (retval && chunk)
|
retval->transport = chunk->transport;
|
retval->transport = chunk->transport;
|
|
|
return retval;
|
return retval;
|
}
|
}
|
|
|
struct sctp_chunk *sctp_make_shutdown_complete(
|
struct sctp_chunk *sctp_make_shutdown_complete(
|
const struct sctp_association *asoc,
|
const struct sctp_association *asoc,
|
const struct sctp_chunk *chunk)
|
const struct sctp_chunk *chunk)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
__u8 flags = 0;
|
__u8 flags = 0;
|
|
|
/* Maybe set the T-bit if we have no association. */
|
/* Maybe set the T-bit if we have no association. */
|
flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
|
flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
|
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0);
|
retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0);
|
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
*
|
*
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* address from which it * received the DATA or control chunk
|
* address from which it * received the DATA or control chunk
|
* to which it is replying.
|
* to which it is replying.
|
*
|
*
|
* [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
|
* [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
|
* came from.]
|
* came from.]
|
*/
|
*/
|
if (retval && chunk)
|
if (retval && chunk)
|
retval->transport = chunk->transport;
|
retval->transport = chunk->transport;
|
|
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Create an ABORT. Note that we set the T bit if we have no
|
/* Create an ABORT. Note that we set the T bit if we have no
|
* association.
|
* association.
|
*/
|
*/
|
struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
|
const struct sctp_chunk *chunk,
|
const struct sctp_chunk *chunk,
|
const size_t hint)
|
const size_t hint)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
__u8 flags = 0;
|
__u8 flags = 0;
|
|
|
/* Maybe set the T-bit if we have no association. */
|
/* Maybe set the T-bit if we have no association. */
|
flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
|
flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
|
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint);
|
retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint);
|
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
*
|
*
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* address from which it * received the DATA or control chunk
|
* address from which it * received the DATA or control chunk
|
* to which it is replying.
|
* to which it is replying.
|
*
|
*
|
* [ABORT back to where the offender came from.]
|
* [ABORT back to where the offender came from.]
|
*/
|
*/
|
if (retval && chunk)
|
if (retval && chunk)
|
retval->transport = chunk->transport;
|
retval->transport = chunk->transport;
|
|
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Helper to create ABORT with a NO_USER_DATA error. */
|
/* Helper to create ABORT with a NO_USER_DATA error. */
|
struct sctp_chunk *sctp_make_abort_no_data(
|
struct sctp_chunk *sctp_make_abort_no_data(
|
const struct sctp_association *asoc,
|
const struct sctp_association *asoc,
|
const struct sctp_chunk *chunk, __u32 tsn)
|
const struct sctp_chunk *chunk, __u32 tsn)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
__u32 payload;
|
__u32 payload;
|
|
|
retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
|
retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
|
+ sizeof(tsn));
|
+ sizeof(tsn));
|
|
|
if (!retval)
|
if (!retval)
|
goto no_mem;
|
goto no_mem;
|
|
|
/* Put the tsn back into network byte order. */
|
/* Put the tsn back into network byte order. */
|
payload = htonl(tsn);
|
payload = htonl(tsn);
|
sctp_init_cause(retval, SCTP_ERROR_NO_DATA, (const void *)&payload,
|
sctp_init_cause(retval, SCTP_ERROR_NO_DATA, (const void *)&payload,
|
sizeof(payload));
|
sizeof(payload));
|
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
*
|
*
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* address from which it * received the DATA or control chunk
|
* address from which it * received the DATA or control chunk
|
* to which it is replying.
|
* to which it is replying.
|
*
|
*
|
* [ABORT back to where the offender came from.]
|
* [ABORT back to where the offender came from.]
|
*/
|
*/
|
if (chunk)
|
if (chunk)
|
retval->transport = chunk->transport;
|
retval->transport = chunk->transport;
|
|
|
no_mem:
|
no_mem:
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
|
/* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
|
struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
|
const struct sctp_chunk *chunk,
|
const struct sctp_chunk *chunk,
|
const struct msghdr *msg)
|
const struct msghdr *msg)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
void *payload = NULL, *payoff;
|
void *payload = NULL, *payoff;
|
size_t paylen = 0;
|
size_t paylen = 0;
|
struct iovec *iov = NULL;
|
struct iovec *iov = NULL;
|
int iovlen = 0;
|
int iovlen = 0;
|
|
|
if (msg) {
|
if (msg) {
|
iov = msg->msg_iov;
|
iov = msg->msg_iov;
|
iovlen = msg->msg_iovlen;
|
iovlen = msg->msg_iovlen;
|
paylen = get_user_iov_size(iov, iovlen);
|
paylen = get_user_iov_size(iov, iovlen);
|
}
|
}
|
|
|
retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen);
|
retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen);
|
if (!retval)
|
if (!retval)
|
goto err_chunk;
|
goto err_chunk;
|
|
|
if (paylen) {
|
if (paylen) {
|
/* Put the msg_iov together into payload. */
|
/* Put the msg_iov together into payload. */
|
payload = kmalloc(paylen, GFP_ATOMIC);
|
payload = kmalloc(paylen, GFP_ATOMIC);
|
if (!payload)
|
if (!payload)
|
goto err_payload;
|
goto err_payload;
|
payoff = payload;
|
payoff = payload;
|
|
|
for (; iovlen > 0; --iovlen) {
|
for (; iovlen > 0; --iovlen) {
|
if (copy_from_user(payoff, iov->iov_base,iov->iov_len))
|
if (copy_from_user(payoff, iov->iov_base,iov->iov_len))
|
goto err_copy;
|
goto err_copy;
|
payoff += iov->iov_len;
|
payoff += iov->iov_len;
|
iov++;
|
iov++;
|
}
|
}
|
}
|
}
|
|
|
sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, payload, paylen);
|
sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, payload, paylen);
|
|
|
if (paylen)
|
if (paylen)
|
kfree(payload);
|
kfree(payload);
|
|
|
return retval;
|
return retval;
|
|
|
err_copy:
|
err_copy:
|
kfree(payload);
|
kfree(payload);
|
err_payload:
|
err_payload:
|
sctp_chunk_free(retval);
|
sctp_chunk_free(retval);
|
retval = NULL;
|
retval = NULL;
|
err_chunk:
|
err_chunk:
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Make a HEARTBEAT chunk. */
|
/* Make a HEARTBEAT chunk. */
|
struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
|
const struct sctp_transport *transport,
|
const struct sctp_transport *transport,
|
const void *payload, const size_t paylen)
|
const void *payload, const size_t paylen)
|
{
|
{
|
struct sctp_chunk *retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT,
|
struct sctp_chunk *retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT,
|
0, paylen);
|
0, paylen);
|
|
|
if (!retval)
|
if (!retval)
|
goto nodata;
|
goto nodata;
|
|
|
/* Cast away the 'const', as this is just telling the chunk
|
/* Cast away the 'const', as this is just telling the chunk
|
* what transport it belongs to.
|
* what transport it belongs to.
|
*/
|
*/
|
retval->transport = (struct sctp_transport *) transport;
|
retval->transport = (struct sctp_transport *) transport;
|
retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
|
retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
|
|
|
nodata:
|
nodata:
|
return retval;
|
return retval;
|
}
|
}
|
|
|
struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
|
const struct sctp_chunk *chunk,
|
const struct sctp_chunk *chunk,
|
const void *payload, const size_t paylen)
|
const void *payload, const size_t paylen)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen);
|
retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen);
|
if (!retval)
|
if (!retval)
|
goto nodata;
|
goto nodata;
|
|
|
retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
|
retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
|
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
*
|
*
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
* address from which it * received the DATA or control chunk
|
* address from which it * received the DATA or control chunk
|
* to which it is replying.
|
* to which it is replying.
|
*
|
*
|
* [HBACK back to where the HEARTBEAT came from.]
|
* [HBACK back to where the HEARTBEAT came from.]
|
*/
|
*/
|
if (chunk)
|
if (chunk)
|
retval->transport = chunk->transport;
|
retval->transport = chunk->transport;
|
|
|
nodata:
|
nodata:
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Create an Operation Error chunk with the specified space reserved.
|
/* Create an Operation Error chunk with the specified space reserved.
|
* This routine can be used for containing multiple causes in the chunk.
|
* This routine can be used for containing multiple causes in the chunk.
|
*/
|
*/
|
struct sctp_chunk *sctp_make_op_error_space(
|
struct sctp_chunk *sctp_make_op_error_space(
|
const struct sctp_association *asoc,
|
const struct sctp_association *asoc,
|
const struct sctp_chunk *chunk,
|
const struct sctp_chunk *chunk,
|
size_t size)
|
size_t size)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0,
|
retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0,
|
sizeof(sctp_errhdr_t) + size);
|
sizeof(sctp_errhdr_t) + size);
|
if (!retval)
|
if (!retval)
|
goto nodata;
|
goto nodata;
|
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
*
|
*
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
* HEARTBEAT ACK, etc.) to the same destination transport
|
* HEARTBEAT ACK, etc.) to the same destination transport
|
* address from which it received the DATA or control chunk
|
* address from which it received the DATA or control chunk
|
* to which it is replying.
|
* to which it is replying.
|
*
|
*
|
*/
|
*/
|
if (chunk)
|
if (chunk)
|
retval->transport = chunk->transport;
|
retval->transport = chunk->transport;
|
|
|
nodata:
|
nodata:
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Create an Operation Error chunk. */
|
/* Create an Operation Error chunk. */
|
struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
|
const struct sctp_chunk *chunk,
|
const struct sctp_chunk *chunk,
|
__u16 cause_code, const void *payload,
|
__u16 cause_code, const void *payload,
|
size_t paylen)
|
size_t paylen)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
|
|
retval = sctp_make_op_error_space(asoc, chunk, paylen);
|
retval = sctp_make_op_error_space(asoc, chunk, paylen);
|
if (!retval)
|
if (!retval)
|
goto nodata;
|
goto nodata;
|
|
|
sctp_init_cause(retval, cause_code, payload, paylen);
|
sctp_init_cause(retval, cause_code, payload, paylen);
|
|
|
nodata:
|
nodata:
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/********************************************************************
|
/********************************************************************
|
* 2nd Level Abstractions
|
* 2nd Level Abstractions
|
********************************************************************/
|
********************************************************************/
|
|
|
/* Turn an skb into a chunk.
|
/* Turn an skb into a chunk.
|
* FIXME: Eventually move the structure directly inside the skb->cb[].
|
* FIXME: Eventually move the structure directly inside the skb->cb[].
|
*/
|
*/
|
struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
|
struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
|
const struct sctp_association *asoc,
|
const struct sctp_association *asoc,
|
struct sock *sk)
|
struct sock *sk)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
|
|
retval = kmem_cache_alloc(sctp_chunk_cachep, SLAB_ATOMIC);
|
retval = kmem_cache_alloc(sctp_chunk_cachep, SLAB_ATOMIC);
|
|
|
if (!retval)
|
if (!retval)
|
goto nodata;
|
goto nodata;
|
memset(retval, 0, sizeof(struct sctp_chunk));
|
memset(retval, 0, sizeof(struct sctp_chunk));
|
|
|
if (!sk) {
|
if (!sk) {
|
SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb);
|
SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb);
|
}
|
}
|
|
|
retval->skb = skb;
|
retval->skb = skb;
|
retval->asoc = (struct sctp_association *)asoc;
|
retval->asoc = (struct sctp_association *)asoc;
|
retval->resent = 0;
|
retval->resent = 0;
|
retval->has_tsn = 0;
|
retval->has_tsn = 0;
|
retval->has_ssn = 0;
|
retval->has_ssn = 0;
|
retval->rtt_in_progress = 0;
|
retval->rtt_in_progress = 0;
|
retval->sent_at = 0;
|
retval->sent_at = 0;
|
retval->singleton = 1;
|
retval->singleton = 1;
|
retval->end_of_packet = 0;
|
retval->end_of_packet = 0;
|
retval->ecn_ce_done = 0;
|
retval->ecn_ce_done = 0;
|
retval->pdiscard = 0;
|
retval->pdiscard = 0;
|
|
|
/* sctpimpguide-05.txt Section 2.8.2
|
/* sctpimpguide-05.txt Section 2.8.2
|
* M1) Each time a new DATA chunk is transmitted
|
* M1) Each time a new DATA chunk is transmitted
|
* set the 'TSN.Missing.Report' count for that TSN to 0. The
|
* set the 'TSN.Missing.Report' count for that TSN to 0. The
|
* 'TSN.Missing.Report' count will be used to determine missing chunks
|
* 'TSN.Missing.Report' count will be used to determine missing chunks
|
* and when to fast retransmit.
|
* and when to fast retransmit.
|
*/
|
*/
|
retval->tsn_missing_report = 0;
|
retval->tsn_missing_report = 0;
|
retval->tsn_gap_acked = 0;
|
retval->tsn_gap_acked = 0;
|
retval->fast_retransmit = 0;
|
retval->fast_retransmit = 0;
|
|
|
/* If this is a fragmented message, track all fragments
|
/* If this is a fragmented message, track all fragments
|
* of the message (for SEND_FAILED).
|
* of the message (for SEND_FAILED).
|
*/
|
*/
|
retval->msg = NULL;
|
retval->msg = NULL;
|
|
|
/* Polish the bead hole. */
|
/* Polish the bead hole. */
|
INIT_LIST_HEAD(&retval->transmitted_list);
|
INIT_LIST_HEAD(&retval->transmitted_list);
|
INIT_LIST_HEAD(&retval->frag_list);
|
INIT_LIST_HEAD(&retval->frag_list);
|
SCTP_DBG_OBJCNT_INC(chunk);
|
SCTP_DBG_OBJCNT_INC(chunk);
|
atomic_set(&retval->refcnt, 1);
|
atomic_set(&retval->refcnt, 1);
|
|
|
|
|
nodata:
|
nodata:
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Set chunk->source and dest based on the IP header in chunk->skb. */
|
/* Set chunk->source and dest based on the IP header in chunk->skb. */
|
void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
|
void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
|
union sctp_addr *dest)
|
union sctp_addr *dest)
|
{
|
{
|
memcpy(&chunk->source, src, sizeof(union sctp_addr));
|
memcpy(&chunk->source, src, sizeof(union sctp_addr));
|
memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
|
memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
|
}
|
}
|
|
|
/* Extract the source address from a chunk. */
|
/* Extract the source address from a chunk. */
|
const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
|
const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
|
{
|
{
|
/* If we have a known transport, use that. */
|
/* If we have a known transport, use that. */
|
if (chunk->transport) {
|
if (chunk->transport) {
|
return &chunk->transport->ipaddr;
|
return &chunk->transport->ipaddr;
|
} else {
|
} else {
|
/* Otherwise, extract it from the IP header. */
|
/* Otherwise, extract it from the IP header. */
|
return &chunk->source;
|
return &chunk->source;
|
}
|
}
|
}
|
}
|
|
|
/* Create a new chunk, setting the type and flags headers from the
|
/* Create a new chunk, setting the type and flags headers from the
|
* arguments, reserving enough space for a 'paylen' byte payload.
|
* arguments, reserving enough space for a 'paylen' byte payload.
|
*/
|
*/
|
struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
|
__u8 type, __u8 flags, int paylen)
|
__u8 type, __u8 flags, int paylen)
|
{
|
{
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
sctp_chunkhdr_t *chunk_hdr;
|
sctp_chunkhdr_t *chunk_hdr;
|
struct sk_buff *skb;
|
struct sk_buff *skb;
|
struct sock *sk;
|
struct sock *sk;
|
|
|
/* No need to allocate LL here, as this is only a chunk. */
|
/* No need to allocate LL here, as this is only a chunk. */
|
skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen),
|
skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen),
|
GFP_ATOMIC);
|
GFP_ATOMIC);
|
if (!skb)
|
if (!skb)
|
goto nodata;
|
goto nodata;
|
|
|
/* Make room for the chunk header. */
|
/* Make room for the chunk header. */
|
chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
|
chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
|
chunk_hdr->type = type;
|
chunk_hdr->type = type;
|
chunk_hdr->flags = flags;
|
chunk_hdr->flags = flags;
|
chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
|
chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
|
|
|
sk = asoc ? asoc->base.sk : NULL;
|
sk = asoc ? asoc->base.sk : NULL;
|
retval = sctp_chunkify(skb, asoc, sk);
|
retval = sctp_chunkify(skb, asoc, sk);
|
if (!retval) {
|
if (!retval) {
|
kfree_skb(skb);
|
kfree_skb(skb);
|
goto nodata;
|
goto nodata;
|
}
|
}
|
|
|
retval->chunk_hdr = chunk_hdr;
|
retval->chunk_hdr = chunk_hdr;
|
retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
|
retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
|
|
|
/* Set the skb to the belonging sock for accounting. */
|
/* Set the skb to the belonging sock for accounting. */
|
skb->sk = sk;
|
skb->sk = sk;
|
|
|
return retval;
|
return retval;
|
nodata:
|
nodata:
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
|
|
/* Release the memory occupied by a chunk. */
|
/* Release the memory occupied by a chunk. */
|
static void sctp_chunk_destroy(struct sctp_chunk *chunk)
|
static void sctp_chunk_destroy(struct sctp_chunk *chunk)
|
{
|
{
|
/* Free the chunk skb data and the SCTP_chunk stub itself. */
|
/* Free the chunk skb data and the SCTP_chunk stub itself. */
|
dev_kfree_skb(chunk->skb);
|
dev_kfree_skb(chunk->skb);
|
|
|
SCTP_DBG_OBJCNT_DEC(chunk);
|
SCTP_DBG_OBJCNT_DEC(chunk);
|
kmem_cache_free(sctp_chunk_cachep, chunk);
|
kmem_cache_free(sctp_chunk_cachep, chunk);
|
}
|
}
|
|
|
/* Possibly, free the chunk. */
|
/* Possibly, free the chunk. */
|
void sctp_chunk_free(struct sctp_chunk *chunk)
|
void sctp_chunk_free(struct sctp_chunk *chunk)
|
{
|
{
|
/* Make sure that we are not on any list. */
|
/* Make sure that we are not on any list. */
|
skb_unlink((struct sk_buff *) chunk);
|
skb_unlink((struct sk_buff *) chunk);
|
list_del_init(&chunk->transmitted_list);
|
list_del_init(&chunk->transmitted_list);
|
|
|
/* Release our reference on the message tracker. */
|
/* Release our reference on the message tracker. */
|
if (chunk->msg)
|
if (chunk->msg)
|
sctp_datamsg_put(chunk->msg);
|
sctp_datamsg_put(chunk->msg);
|
|
|
sctp_chunk_put(chunk);
|
sctp_chunk_put(chunk);
|
}
|
}
|
|
|
/* Grab a reference to the chunk. */
|
/* Grab a reference to the chunk. */
|
void sctp_chunk_hold(struct sctp_chunk *ch)
|
void sctp_chunk_hold(struct sctp_chunk *ch)
|
{
|
{
|
atomic_inc(&ch->refcnt);
|
atomic_inc(&ch->refcnt);
|
}
|
}
|
|
|
/* Release a reference to the chunk. */
|
/* Release a reference to the chunk. */
|
void sctp_chunk_put(struct sctp_chunk *ch)
|
void sctp_chunk_put(struct sctp_chunk *ch)
|
{
|
{
|
if (atomic_dec_and_test(&ch->refcnt))
|
if (atomic_dec_and_test(&ch->refcnt))
|
sctp_chunk_destroy(ch);
|
sctp_chunk_destroy(ch);
|
}
|
}
|
|
|
/* Append bytes to the end of a chunk. Will panic if chunk is not big
|
/* Append bytes to the end of a chunk. Will panic if chunk is not big
|
* enough.
|
* enough.
|
*/
|
*/
|
void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
|
void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
|
{
|
{
|
void *target;
|
void *target;
|
void *padding;
|
void *padding;
|
int chunklen = ntohs(chunk->chunk_hdr->length);
|
int chunklen = ntohs(chunk->chunk_hdr->length);
|
int padlen = chunklen % 4;
|
int padlen = chunklen % 4;
|
|
|
padding = skb_put(chunk->skb, padlen);
|
padding = skb_put(chunk->skb, padlen);
|
target = skb_put(chunk->skb, len);
|
target = skb_put(chunk->skb, len);
|
|
|
memset(padding, 0, padlen);
|
memset(padding, 0, padlen);
|
memcpy(target, data, len);
|
memcpy(target, data, len);
|
|
|
/* Adjust the chunk length field. */
|
/* Adjust the chunk length field. */
|
chunk->chunk_hdr->length = htons(chunklen + padlen + len);
|
chunk->chunk_hdr->length = htons(chunklen + padlen + len);
|
chunk->chunk_end = chunk->skb->tail;
|
chunk->chunk_end = chunk->skb->tail;
|
|
|
return target;
|
return target;
|
}
|
}
|
|
|
/* Append bytes from user space to the end of a chunk. Will panic if
|
/* Append bytes from user space to the end of a chunk. Will panic if
|
* chunk is not big enough.
|
* chunk is not big enough.
|
* Returns a kernel err value.
|
* Returns a kernel err value.
|
*/
|
*/
|
int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
|
int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
|
struct iovec *data)
|
struct iovec *data)
|
{
|
{
|
__u8 *target;
|
__u8 *target;
|
int err = 0;
|
int err = 0;
|
|
|
/* Make room in chunk for data. */
|
/* Make room in chunk for data. */
|
target = skb_put(chunk->skb, len);
|
target = skb_put(chunk->skb, len);
|
|
|
/* Copy data (whole iovec) into chunk */
|
/* Copy data (whole iovec) into chunk */
|
if ((err = memcpy_fromiovecend(target, data, off, len)))
|
if ((err = memcpy_fromiovecend(target, data, off, len)))
|
goto out;
|
goto out;
|
|
|
/* Adjust the chunk length field. */
|
/* Adjust the chunk length field. */
|
chunk->chunk_hdr->length =
|
chunk->chunk_hdr->length =
|
htons(ntohs(chunk->chunk_hdr->length) + len);
|
htons(ntohs(chunk->chunk_hdr->length) + len);
|
chunk->chunk_end = chunk->skb->tail;
|
chunk->chunk_end = chunk->skb->tail;
|
|
|
out:
|
out:
|
return err;
|
return err;
|
}
|
}
|
|
|
/* Helper function to assign a TSN if needed. This assumes that both
|
/* Helper function to assign a TSN if needed. This assumes that both
|
* the data_hdr and association have already been assigned.
|
* the data_hdr and association have already been assigned.
|
*/
|
*/
|
void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
|
void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
|
{
|
{
|
__u16 ssn;
|
__u16 ssn;
|
__u16 sid;
|
__u16 sid;
|
|
|
if (chunk->has_ssn)
|
if (chunk->has_ssn)
|
return;
|
return;
|
|
|
/* This is the last possible instant to assign a SSN. */
|
/* This is the last possible instant to assign a SSN. */
|
if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
|
if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
|
ssn = 0;
|
ssn = 0;
|
} else {
|
} else {
|
sid = htons(chunk->subh.data_hdr->stream);
|
sid = htons(chunk->subh.data_hdr->stream);
|
if (chunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
|
if (chunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
|
ssn = sctp_ssn_next(&chunk->asoc->ssnmap->out, sid);
|
ssn = sctp_ssn_next(&chunk->asoc->ssnmap->out, sid);
|
else
|
else
|
ssn = sctp_ssn_peek(&chunk->asoc->ssnmap->out, sid);
|
ssn = sctp_ssn_peek(&chunk->asoc->ssnmap->out, sid);
|
ssn = htons(ssn);
|
ssn = htons(ssn);
|
}
|
}
|
|
|
chunk->subh.data_hdr->ssn = ssn;
|
chunk->subh.data_hdr->ssn = ssn;
|
chunk->has_ssn = 1;
|
chunk->has_ssn = 1;
|
}
|
}
|
|
|
/* Helper function to assign a TSN if needed. This assumes that both
|
/* Helper function to assign a TSN if needed. This assumes that both
|
* the data_hdr and association have already been assigned.
|
* the data_hdr and association have already been assigned.
|
*/
|
*/
|
void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
|
void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
|
{
|
{
|
if (!chunk->has_tsn) {
|
if (!chunk->has_tsn) {
|
/* This is the last possible instant to
|
/* This is the last possible instant to
|
* assign a TSN.
|
* assign a TSN.
|
*/
|
*/
|
chunk->subh.data_hdr->tsn =
|
chunk->subh.data_hdr->tsn =
|
htonl(sctp_association_get_next_tsn(chunk->asoc));
|
htonl(sctp_association_get_next_tsn(chunk->asoc));
|
chunk->has_tsn = 1;
|
chunk->has_tsn = 1;
|
}
|
}
|
}
|
}
|
|
|
/* Create a CLOSED association to use with an incoming packet. */
|
/* Create a CLOSED association to use with an incoming packet. */
|
struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
|
struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
|
struct sctp_chunk *chunk, int gfp)
|
struct sctp_chunk *chunk, int gfp)
|
{
|
{
|
struct sctp_association *asoc;
|
struct sctp_association *asoc;
|
struct sk_buff *skb;
|
struct sk_buff *skb;
|
sctp_scope_t scope;
|
sctp_scope_t scope;
|
struct sctp_af *af;
|
struct sctp_af *af;
|
|
|
/* Create the bare association. */
|
/* Create the bare association. */
|
scope = sctp_scope(sctp_source(chunk));
|
scope = sctp_scope(sctp_source(chunk));
|
asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
|
asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
|
if (!asoc)
|
if (!asoc)
|
goto nodata;
|
goto nodata;
|
asoc->temp = 1;
|
asoc->temp = 1;
|
skb = chunk->skb;
|
skb = chunk->skb;
|
/* Create an entry for the source address of the packet. */
|
/* Create an entry for the source address of the packet. */
|
af = sctp_get_af_specific(ipver2af(skb->nh.iph->version));
|
af = sctp_get_af_specific(ipver2af(skb->nh.iph->version));
|
if (unlikely(!af))
|
if (unlikely(!af))
|
goto fail;
|
goto fail;
|
af->from_skb(&asoc->c.peer_addr, skb, 1);
|
af->from_skb(&asoc->c.peer_addr, skb, 1);
|
nodata:
|
nodata:
|
return asoc;
|
return asoc;
|
|
|
fail:
|
fail:
|
sctp_association_free(asoc);
|
sctp_association_free(asoc);
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
/* Build a cookie representing asoc.
|
/* Build a cookie representing asoc.
|
* This INCLUDES the param header needed to put the cookie in the INIT ACK.
|
* This INCLUDES the param header needed to put the cookie in the INIT ACK.
|
*/
|
*/
|
sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
|
sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
|
const struct sctp_association *asoc,
|
const struct sctp_association *asoc,
|
const struct sctp_chunk *init_chunk,
|
const struct sctp_chunk *init_chunk,
|
int *cookie_len,
|
int *cookie_len,
|
const __u8 *raw_addrs, int addrs_len)
|
const __u8 *raw_addrs, int addrs_len)
|
{
|
{
|
sctp_cookie_param_t *retval;
|
sctp_cookie_param_t *retval;
|
struct sctp_signed_cookie *cookie;
|
struct sctp_signed_cookie *cookie;
|
struct scatterlist sg;
|
struct scatterlist sg;
|
int headersize, bodysize;
|
int headersize, bodysize;
|
unsigned int keylen;
|
unsigned int keylen;
|
char *key;
|
char *key;
|
|
|
headersize = sizeof(sctp_paramhdr_t) + SCTP_SECRET_SIZE;
|
headersize = sizeof(sctp_paramhdr_t) + SCTP_SECRET_SIZE;
|
bodysize = sizeof(struct sctp_cookie)
|
bodysize = sizeof(struct sctp_cookie)
|
+ ntohs(init_chunk->chunk_hdr->length) + addrs_len;
|
+ ntohs(init_chunk->chunk_hdr->length) + addrs_len;
|
|
|
/* Pad out the cookie to a multiple to make the signature
|
/* Pad out the cookie to a multiple to make the signature
|
* functions simpler to write.
|
* functions simpler to write.
|
*/
|
*/
|
if (bodysize % SCTP_COOKIE_MULTIPLE)
|
if (bodysize % SCTP_COOKIE_MULTIPLE)
|
bodysize += SCTP_COOKIE_MULTIPLE
|
bodysize += SCTP_COOKIE_MULTIPLE
|
- (bodysize % SCTP_COOKIE_MULTIPLE);
|
- (bodysize % SCTP_COOKIE_MULTIPLE);
|
*cookie_len = headersize + bodysize;
|
*cookie_len = headersize + bodysize;
|
|
|
retval = (sctp_cookie_param_t *)kmalloc(*cookie_len, GFP_ATOMIC);
|
retval = (sctp_cookie_param_t *)kmalloc(*cookie_len, GFP_ATOMIC);
|
|
|
if (!retval) {
|
if (!retval) {
|
*cookie_len = 0;
|
*cookie_len = 0;
|
goto nodata;
|
goto nodata;
|
}
|
}
|
|
|
/* Clear this memory since we are sending this data structure
|
/* Clear this memory since we are sending this data structure
|
* out on the network.
|
* out on the network.
|
*/
|
*/
|
memset(retval, 0x00, *cookie_len);
|
memset(retval, 0x00, *cookie_len);
|
cookie = (struct sctp_signed_cookie *) retval->body;
|
cookie = (struct sctp_signed_cookie *) retval->body;
|
|
|
/* Set up the parameter header. */
|
/* Set up the parameter header. */
|
retval->p.type = SCTP_PARAM_STATE_COOKIE;
|
retval->p.type = SCTP_PARAM_STATE_COOKIE;
|
retval->p.length = htons(*cookie_len);
|
retval->p.length = htons(*cookie_len);
|
|
|
/* Copy the cookie part of the association itself. */
|
/* Copy the cookie part of the association itself. */
|
cookie->c = asoc->c;
|
cookie->c = asoc->c;
|
/* Save the raw address list length in the cookie. */
|
/* Save the raw address list length in the cookie. */
|
cookie->c.raw_addr_list_len = addrs_len;
|
cookie->c.raw_addr_list_len = addrs_len;
|
|
|
/* Set an expiration time for the cookie. */
|
/* Set an expiration time for the cookie. */
|
do_gettimeofday(&cookie->c.expiration);
|
do_gettimeofday(&cookie->c.expiration);
|
TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration);
|
TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration);
|
|
|
/* Copy the peer's init packet. */
|
/* Copy the peer's init packet. */
|
memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
|
memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
|
ntohs(init_chunk->chunk_hdr->length));
|
ntohs(init_chunk->chunk_hdr->length));
|
|
|
/* Copy the raw local address list of the association. */
|
/* Copy the raw local address list of the association. */
|
memcpy((__u8 *)&cookie->c.peer_init[0] +
|
memcpy((__u8 *)&cookie->c.peer_init[0] +
|
ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
|
ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
|
|
|
if (sctp_sk(ep->base.sk)->hmac) {
|
if (sctp_sk(ep->base.sk)->hmac) {
|
/* Sign the message. */
|
/* Sign the message. */
|
sg.page = virt_to_page(&cookie->c);
|
sg.page = virt_to_page(&cookie->c);
|
sg.offset = (unsigned long)(&cookie->c) % PAGE_SIZE;
|
sg.offset = (unsigned long)(&cookie->c) % PAGE_SIZE;
|
sg.length = bodysize;
|
sg.length = bodysize;
|
keylen = SCTP_SECRET_SIZE;
|
keylen = SCTP_SECRET_SIZE;
|
key = (char *)ep->secret_key[ep->current_key];
|
key = (char *)ep->secret_key[ep->current_key];
|
|
|
sctp_crypto_hmac(sctp_sk(ep->base.sk)->hmac, key, &keylen,
|
sctp_crypto_hmac(sctp_sk(ep->base.sk)->hmac, key, &keylen,
|
&sg, 1, cookie->signature);
|
&sg, 1, cookie->signature);
|
}
|
}
|
|
|
nodata:
|
nodata:
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
|
/* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
|
struct sctp_association *sctp_unpack_cookie(
|
struct sctp_association *sctp_unpack_cookie(
|
const struct sctp_endpoint *ep,
|
const struct sctp_endpoint *ep,
|
const struct sctp_association *asoc,
|
const struct sctp_association *asoc,
|
struct sctp_chunk *chunk, int gfp,
|
struct sctp_chunk *chunk, int gfp,
|
int *error, struct sctp_chunk **errp)
|
int *error, struct sctp_chunk **errp)
|
{
|
{
|
struct sctp_association *retval = NULL;
|
struct sctp_association *retval = NULL;
|
struct sctp_signed_cookie *cookie;
|
struct sctp_signed_cookie *cookie;
|
struct sctp_cookie *bear_cookie;
|
struct sctp_cookie *bear_cookie;
|
int headersize, bodysize, fixed_size;
|
int headersize, bodysize, fixed_size;
|
__u8 digest[SCTP_SIGNATURE_SIZE];
|
__u8 digest[SCTP_SIGNATURE_SIZE];
|
struct scatterlist sg;
|
struct scatterlist sg;
|
unsigned int keylen, len;
|
unsigned int keylen, len;
|
char *key;
|
char *key;
|
sctp_scope_t scope;
|
sctp_scope_t scope;
|
struct sk_buff *skb = chunk->skb;
|
struct sk_buff *skb = chunk->skb;
|
|
|
headersize = sizeof(sctp_chunkhdr_t) + SCTP_SECRET_SIZE;
|
headersize = sizeof(sctp_chunkhdr_t) + SCTP_SECRET_SIZE;
|
bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
|
bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
|
fixed_size = headersize + sizeof(struct sctp_cookie);
|
fixed_size = headersize + sizeof(struct sctp_cookie);
|
|
|
/* Verify that the chunk looks like it even has a cookie.
|
/* Verify that the chunk looks like it even has a cookie.
|
* There must be enough room for our cookie and our peer's
|
* There must be enough room for our cookie and our peer's
|
* INIT chunk.
|
* INIT chunk.
|
*/
|
*/
|
len = ntohs(chunk->chunk_hdr->length);
|
len = ntohs(chunk->chunk_hdr->length);
|
if (len < fixed_size + sizeof(struct sctp_chunkhdr))
|
if (len < fixed_size + sizeof(struct sctp_chunkhdr))
|
goto malformed;
|
goto malformed;
|
|
|
/* Verify that the cookie has been padded out. */
|
/* Verify that the cookie has been padded out. */
|
if (bodysize % SCTP_COOKIE_MULTIPLE)
|
if (bodysize % SCTP_COOKIE_MULTIPLE)
|
goto malformed;
|
goto malformed;
|
|
|
/* Process the cookie. */
|
/* Process the cookie. */
|
cookie = chunk->subh.cookie_hdr;
|
cookie = chunk->subh.cookie_hdr;
|
bear_cookie = &cookie->c;
|
bear_cookie = &cookie->c;
|
|
|
if (!sctp_sk(ep->base.sk)->hmac)
|
if (!sctp_sk(ep->base.sk)->hmac)
|
goto no_hmac;
|
goto no_hmac;
|
|
|
/* Check the signature. */
|
/* Check the signature. */
|
keylen = SCTP_SECRET_SIZE;
|
keylen = SCTP_SECRET_SIZE;
|
sg.page = virt_to_page(bear_cookie);
|
sg.page = virt_to_page(bear_cookie);
|
sg.offset = (unsigned long)(bear_cookie) % PAGE_SIZE;
|
sg.offset = (unsigned long)(bear_cookie) % PAGE_SIZE;
|
sg.length = bodysize;
|
sg.length = bodysize;
|
key = (char *)ep->secret_key[ep->current_key];
|
key = (char *)ep->secret_key[ep->current_key];
|
|
|
memset(digest, 0x00, sizeof(digest));
|
memset(digest, 0x00, sizeof(digest));
|
sctp_crypto_hmac(sctp_sk(ep->base.sk)->hmac, key, &keylen, &sg,
|
sctp_crypto_hmac(sctp_sk(ep->base.sk)->hmac, key, &keylen, &sg,
|
1, digest);
|
1, digest);
|
|
|
if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
|
if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
|
/* Try the previous key. */
|
/* Try the previous key. */
|
key = (char *)ep->secret_key[ep->last_key];
|
key = (char *)ep->secret_key[ep->last_key];
|
memset(digest, 0x00, sizeof(digest));
|
memset(digest, 0x00, sizeof(digest));
|
sctp_crypto_hmac(sctp_sk(ep->base.sk)->hmac, key, &keylen,
|
sctp_crypto_hmac(sctp_sk(ep->base.sk)->hmac, key, &keylen,
|
&sg, 1, digest);
|
&sg, 1, digest);
|
|
|
if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
|
if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
|
/* Yikes! Still bad signature! */
|
/* Yikes! Still bad signature! */
|
*error = -SCTP_IERROR_BAD_SIG;
|
*error = -SCTP_IERROR_BAD_SIG;
|
goto fail;
|
goto fail;
|
}
|
}
|
}
|
}
|
|
|
no_hmac:
|
no_hmac:
|
/* Check to see if the cookie is stale. If there is already
|
/* Check to see if the cookie is stale. If there is already
|
* an association, there is no need to check cookie's expiration
|
* an association, there is no need to check cookie's expiration
|
* for init collision case of lost COOKIE ACK.
|
* for init collision case of lost COOKIE ACK.
|
*/
|
*/
|
if (!asoc && tv_lt(bear_cookie->expiration, skb->stamp)) {
|
if (!asoc && tv_lt(bear_cookie->expiration, skb->stamp)) {
|
__u16 len;
|
__u16 len;
|
/*
|
/*
|
* Section 3.3.10.3 Stale Cookie Error (3)
|
* Section 3.3.10.3 Stale Cookie Error (3)
|
*
|
*
|
* Cause of error
|
* Cause of error
|
* ---------------
|
* ---------------
|
* Stale Cookie Error: Indicates the receipt of a valid State
|
* Stale Cookie Error: Indicates the receipt of a valid State
|
* Cookie that has expired.
|
* Cookie that has expired.
|
*/
|
*/
|
len = ntohs(chunk->chunk_hdr->length);
|
len = ntohs(chunk->chunk_hdr->length);
|
*errp = sctp_make_op_error_space(asoc, chunk, len);
|
*errp = sctp_make_op_error_space(asoc, chunk, len);
|
if (*errp) {
|
if (*errp) {
|
suseconds_t usecs = (skb->stamp.tv_sec -
|
suseconds_t usecs = (skb->stamp.tv_sec -
|
bear_cookie->expiration.tv_sec) * 1000000L +
|
bear_cookie->expiration.tv_sec) * 1000000L +
|
skb->stamp.tv_usec -
|
skb->stamp.tv_usec -
|
bear_cookie->expiration.tv_usec;
|
bear_cookie->expiration.tv_usec;
|
|
|
usecs = htonl(usecs);
|
usecs = htonl(usecs);
|
sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
|
sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
|
&usecs, sizeof(usecs));
|
&usecs, sizeof(usecs));
|
*error = -SCTP_IERROR_STALE_COOKIE;
|
*error = -SCTP_IERROR_STALE_COOKIE;
|
} else
|
} else
|
*error = -SCTP_IERROR_NOMEM;
|
*error = -SCTP_IERROR_NOMEM;
|
|
|
goto fail;
|
goto fail;
|
}
|
}
|
|
|
/* Make a new base association. */
|
/* Make a new base association. */
|
scope = sctp_scope(sctp_source(chunk));
|
scope = sctp_scope(sctp_source(chunk));
|
retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
|
retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
|
if (!retval) {
|
if (!retval) {
|
*error = -SCTP_IERROR_NOMEM;
|
*error = -SCTP_IERROR_NOMEM;
|
goto fail;
|
goto fail;
|
}
|
}
|
|
|
/* Set up our peer's port number. */
|
/* Set up our peer's port number. */
|
retval->peer.port = ntohs(chunk->sctp_hdr->source);
|
retval->peer.port = ntohs(chunk->sctp_hdr->source);
|
|
|
/* Populate the association from the cookie. */
|
/* Populate the association from the cookie. */
|
memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
|
memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
|
|
|
if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
|
if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
|
GFP_ATOMIC) < 0) {
|
GFP_ATOMIC) < 0) {
|
*error = -SCTP_IERROR_NOMEM;
|
*error = -SCTP_IERROR_NOMEM;
|
goto fail;
|
goto fail;
|
}
|
}
|
|
|
/* Also, add the destination address. */
|
/* Also, add the destination address. */
|
if (list_empty(&retval->base.bind_addr.address_list)) {
|
if (list_empty(&retval->base.bind_addr.address_list)) {
|
sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
|
sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
|
GFP_ATOMIC);
|
GFP_ATOMIC);
|
}
|
}
|
|
|
retval->next_tsn = retval->c.initial_tsn;
|
retval->next_tsn = retval->c.initial_tsn;
|
retval->ctsn_ack_point = retval->next_tsn - 1;
|
retval->ctsn_ack_point = retval->next_tsn - 1;
|
retval->addip_serial = retval->c.initial_tsn;
|
retval->addip_serial = retval->c.initial_tsn;
|
|
|
/* The INIT stuff will be done by the side effects. */
|
/* The INIT stuff will be done by the side effects. */
|
return retval;
|
return retval;
|
|
|
fail:
|
fail:
|
if (retval)
|
if (retval)
|
sctp_association_free(retval);
|
sctp_association_free(retval);
|
|
|
return NULL;
|
return NULL;
|
|
|
malformed:
|
malformed:
|
/* Yikes! The packet is either corrupt or deliberately
|
/* Yikes! The packet is either corrupt or deliberately
|
* malformed.
|
* malformed.
|
*/
|
*/
|
*error = -SCTP_IERROR_MALFORMED;
|
*error = -SCTP_IERROR_MALFORMED;
|
goto fail;
|
goto fail;
|
}
|
}
|
|
|
/********************************************************************
|
/********************************************************************
|
* 3rd Level Abstractions
|
* 3rd Level Abstractions
|
********************************************************************/
|
********************************************************************/
|
|
|
struct __sctp_missing {
|
struct __sctp_missing {
|
__u32 num_missing;
|
__u32 num_missing;
|
__u16 type;
|
__u16 type;
|
} __attribute__((packed));;
|
} __attribute__((packed));;
|
|
|
/*
|
/*
|
* Report a missing mandatory parameter.
|
* Report a missing mandatory parameter.
|
*/
|
*/
|
static int sctp_process_missing_param(const struct sctp_association *asoc,
|
static int sctp_process_missing_param(const struct sctp_association *asoc,
|
sctp_param_t paramtype,
|
sctp_param_t paramtype,
|
struct sctp_chunk *chunk,
|
struct sctp_chunk *chunk,
|
struct sctp_chunk **errp)
|
struct sctp_chunk **errp)
|
{
|
{
|
struct __sctp_missing report;
|
struct __sctp_missing report;
|
__u16 len;
|
__u16 len;
|
|
|
len = WORD_ROUND(sizeof(report));
|
len = WORD_ROUND(sizeof(report));
|
|
|
/* Make an ERROR chunk, preparing enough room for
|
/* Make an ERROR chunk, preparing enough room for
|
* returning multiple unknown parameters.
|
* returning multiple unknown parameters.
|
*/
|
*/
|
if (!*errp)
|
if (!*errp)
|
*errp = sctp_make_op_error_space(asoc, chunk, len);
|
*errp = sctp_make_op_error_space(asoc, chunk, len);
|
|
|
if (*errp) {
|
if (*errp) {
|
report.num_missing = htonl(1);
|
report.num_missing = htonl(1);
|
report.type = paramtype;
|
report.type = paramtype;
|
sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM,
|
sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM,
|
&report, sizeof(report));
|
&report, sizeof(report));
|
}
|
}
|
|
|
/* Stop processing this chunk. */
|
/* Stop processing this chunk. */
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Report an Invalid Mandatory Parameter. */
|
/* Report an Invalid Mandatory Parameter. */
|
static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
|
static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
|
struct sctp_chunk *chunk,
|
struct sctp_chunk *chunk,
|
struct sctp_chunk **errp)
|
struct sctp_chunk **errp)
|
{
|
{
|
/* Invalid Mandatory Parameter Error has no payload. */
|
/* Invalid Mandatory Parameter Error has no payload. */
|
|
|
if (!*errp)
|
if (!*errp)
|
*errp = sctp_make_op_error_space(asoc, chunk, 0);
|
*errp = sctp_make_op_error_space(asoc, chunk, 0);
|
|
|
if (*errp)
|
if (*errp)
|
sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, NULL, 0);
|
sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, NULL, 0);
|
|
|
/* Stop processing this chunk. */
|
/* Stop processing this chunk. */
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Do not attempt to handle the HOST_NAME parm. However, do
|
/* Do not attempt to handle the HOST_NAME parm. However, do
|
* send back an indicator to the peer.
|
* send back an indicator to the peer.
|
*/
|
*/
|
static int sctp_process_hn_param(const struct sctp_association *asoc,
|
static int sctp_process_hn_param(const struct sctp_association *asoc,
|
union sctp_params param,
|
union sctp_params param,
|
struct sctp_chunk *chunk,
|
struct sctp_chunk *chunk,
|
struct sctp_chunk **errp)
|
struct sctp_chunk **errp)
|
{
|
{
|
__u16 len = ntohs(param.p->length);
|
__u16 len = ntohs(param.p->length);
|
|
|
/* Make an ERROR chunk. */
|
/* Make an ERROR chunk. */
|
if (!*errp)
|
if (!*errp)
|
*errp = sctp_make_op_error_space(asoc, chunk, len);
|
*errp = sctp_make_op_error_space(asoc, chunk, len);
|
|
|
if (*errp)
|
if (*errp)
|
sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED,
|
sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED,
|
param.v, len);
|
param.v, len);
|
|
|
/* Stop processing this chunk. */
|
/* Stop processing this chunk. */
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* RFC 3.2.1 & the Implementers Guide 2.2.
|
/* RFC 3.2.1 & the Implementers Guide 2.2.
|
*
|
*
|
* The Parameter Types are encoded such that the
|
* The Parameter Types are encoded such that the
|
* highest-order two bits specify the action that must be
|
* highest-order two bits specify the action that must be
|
* taken if the processing endpoint does not recognize the
|
* taken if the processing endpoint does not recognize the
|
* Parameter Type.
|
* Parameter Type.
|
*
|
*
|
* 00 - Stop processing this SCTP chunk and discard it,
|
* 00 - Stop processing this SCTP chunk and discard it,
|
* do not process any further chunks within it.
|
* do not process any further chunks within it.
|
*
|
*
|
* 01 - Stop processing this SCTP chunk and discard it,
|
* 01 - Stop processing this SCTP chunk and discard it,
|
* do not process any further chunks within it, and report
|
* do not process any further chunks within it, and report
|
* the unrecognized parameter in an 'Unrecognized
|
* the unrecognized parameter in an 'Unrecognized
|
* Parameter Type' (in either an ERROR or in the INIT ACK).
|
* Parameter Type' (in either an ERROR or in the INIT ACK).
|
*
|
*
|
* 10 - Skip this parameter and continue processing.
|
* 10 - Skip this parameter and continue processing.
|
*
|
*
|
* 11 - Skip this parameter and continue processing but
|
* 11 - Skip this parameter and continue processing but
|
* report the unrecognized parameter in an
|
* report the unrecognized parameter in an
|
* 'Unrecognized Parameter Type' (in either an ERROR or in
|
* 'Unrecognized Parameter Type' (in either an ERROR or in
|
* the INIT ACK).
|
* the INIT ACK).
|
*
|
*
|
* Return value:
|
* Return value:
|
* 0 - discard the chunk
|
* 0 - discard the chunk
|
* 1 - continue with the chunk
|
* 1 - continue with the chunk
|
*/
|
*/
|
static int sctp_process_unk_param(const struct sctp_association *asoc,
|
static int sctp_process_unk_param(const struct sctp_association *asoc,
|
union sctp_params param,
|
union sctp_params param,
|
struct sctp_chunk *chunk,
|
struct sctp_chunk *chunk,
|
struct sctp_chunk **errp)
|
struct sctp_chunk **errp)
|
{
|
{
|
int retval = 1;
|
int retval = 1;
|
|
|
switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
|
switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
|
case SCTP_PARAM_ACTION_DISCARD:
|
case SCTP_PARAM_ACTION_DISCARD:
|
retval = 0;
|
retval = 0;
|
break;
|
break;
|
case SCTP_PARAM_ACTION_DISCARD_ERR:
|
case SCTP_PARAM_ACTION_DISCARD_ERR:
|
retval = 0;
|
retval = 0;
|
/* Make an ERROR chunk, preparing enough room for
|
/* Make an ERROR chunk, preparing enough room for
|
* returning multiple unknown parameters.
|
* returning multiple unknown parameters.
|
*/
|
*/
|
if (NULL == *errp)
|
if (NULL == *errp)
|
*errp = sctp_make_op_error_space(asoc, chunk,
|
*errp = sctp_make_op_error_space(asoc, chunk,
|
ntohs(chunk->chunk_hdr->length));
|
ntohs(chunk->chunk_hdr->length));
|
|
|
if (*errp)
|
if (*errp)
|
sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
|
sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
|
param.v,
|
param.v,
|
WORD_ROUND(ntohs(param.p->length)));
|
WORD_ROUND(ntohs(param.p->length)));
|
|
|
break;
|
break;
|
case SCTP_PARAM_ACTION_SKIP:
|
case SCTP_PARAM_ACTION_SKIP:
|
break;
|
break;
|
case SCTP_PARAM_ACTION_SKIP_ERR:
|
case SCTP_PARAM_ACTION_SKIP_ERR:
|
/* Make an ERROR chunk, preparing enough room for
|
/* Make an ERROR chunk, preparing enough room for
|
* returning multiple unknown parameters.
|
* returning multiple unknown parameters.
|
*/
|
*/
|
if (NULL == *errp)
|
if (NULL == *errp)
|
*errp = sctp_make_op_error_space(asoc, chunk,
|
*errp = sctp_make_op_error_space(asoc, chunk,
|
ntohs(chunk->chunk_hdr->length));
|
ntohs(chunk->chunk_hdr->length));
|
|
|
if (*errp) {
|
if (*errp) {
|
sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
|
sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
|
param.v,
|
param.v,
|
WORD_ROUND(ntohs(param.p->length)));
|
WORD_ROUND(ntohs(param.p->length)));
|
} else {
|
} else {
|
/* If there is no memory for generating the ERROR
|
/* If there is no memory for generating the ERROR
|
* report as specified, an ABORT will be triggered
|
* report as specified, an ABORT will be triggered
|
* to the peer and the association won't be
|
* to the peer and the association won't be
|
* established.
|
* established.
|
*/
|
*/
|
retval = 0;
|
retval = 0;
|
}
|
}
|
|
|
break;
|
break;
|
default:
|
default:
|
break;
|
break;
|
}
|
}
|
|
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Find unrecognized parameters in the chunk.
|
/* Find unrecognized parameters in the chunk.
|
* Return values:
|
* Return values:
|
* 0 - discard the chunk
|
* 0 - discard the chunk
|
* 1 - continue with the chunk
|
* 1 - continue with the chunk
|
*/
|
*/
|
static int sctp_verify_param(const struct sctp_association *asoc,
|
static int sctp_verify_param(const struct sctp_association *asoc,
|
union sctp_params param,
|
union sctp_params param,
|
sctp_cid_t cid,
|
sctp_cid_t cid,
|
struct sctp_chunk *chunk,
|
struct sctp_chunk *chunk,
|
struct sctp_chunk **err_chunk)
|
struct sctp_chunk **err_chunk)
|
{
|
{
|
int retval = 1;
|
int retval = 1;
|
|
|
/* FIXME - This routine is not looking at each parameter per the
|
/* FIXME - This routine is not looking at each parameter per the
|
* chunk type, i.e., unrecognized parameters should be further
|
* chunk type, i.e., unrecognized parameters should be further
|
* identified based on the chunk id.
|
* identified based on the chunk id.
|
*/
|
*/
|
|
|
switch (param.p->type) {
|
switch (param.p->type) {
|
case SCTP_PARAM_IPV4_ADDRESS:
|
case SCTP_PARAM_IPV4_ADDRESS:
|
case SCTP_PARAM_IPV6_ADDRESS:
|
case SCTP_PARAM_IPV6_ADDRESS:
|
case SCTP_PARAM_COOKIE_PRESERVATIVE:
|
case SCTP_PARAM_COOKIE_PRESERVATIVE:
|
case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
|
case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
|
case SCTP_PARAM_STATE_COOKIE:
|
case SCTP_PARAM_STATE_COOKIE:
|
case SCTP_PARAM_HEARTBEAT_INFO:
|
case SCTP_PARAM_HEARTBEAT_INFO:
|
case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
|
case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
|
case SCTP_PARAM_ECN_CAPABLE:
|
case SCTP_PARAM_ECN_CAPABLE:
|
break;
|
break;
|
|
|
case SCTP_PARAM_HOST_NAME_ADDRESS:
|
case SCTP_PARAM_HOST_NAME_ADDRESS:
|
/* Tell the peer, we won't support this param. */
|
/* Tell the peer, we won't support this param. */
|
return sctp_process_hn_param(asoc, param, chunk, err_chunk);
|
return sctp_process_hn_param(asoc, param, chunk, err_chunk);
|
default:
|
default:
|
SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
|
SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
|
ntohs(param.p->type), cid);
|
ntohs(param.p->type), cid);
|
return sctp_process_unk_param(asoc, param, chunk, err_chunk);
|
return sctp_process_unk_param(asoc, param, chunk, err_chunk);
|
|
|
break;
|
break;
|
}
|
}
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Verify the INIT packet before we process it. */
|
/* Verify the INIT packet before we process it. */
|
int sctp_verify_init(const struct sctp_association *asoc,
|
int sctp_verify_init(const struct sctp_association *asoc,
|
sctp_cid_t cid,
|
sctp_cid_t cid,
|
sctp_init_chunk_t *peer_init,
|
sctp_init_chunk_t *peer_init,
|
struct sctp_chunk *chunk,
|
struct sctp_chunk *chunk,
|
struct sctp_chunk **errp)
|
struct sctp_chunk **errp)
|
{
|
{
|
union sctp_params param;
|
union sctp_params param;
|
int has_cookie = 0;
|
int has_cookie = 0;
|
|
|
/* Verify stream values are non-zero. */
|
/* Verify stream values are non-zero. */
|
if ((0 == peer_init->init_hdr.num_outbound_streams) ||
|
if ((0 == peer_init->init_hdr.num_outbound_streams) ||
|
(0 == peer_init->init_hdr.num_inbound_streams)) {
|
(0 == peer_init->init_hdr.num_inbound_streams)) {
|
|
|
sctp_process_inv_mandatory(asoc, chunk, errp);
|
sctp_process_inv_mandatory(asoc, chunk, errp);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Check for missing mandatory parameters. */
|
/* Check for missing mandatory parameters. */
|
sctp_walk_params(param, peer_init, init_hdr.params) {
|
sctp_walk_params(param, peer_init, init_hdr.params) {
|
|
|
if (SCTP_PARAM_STATE_COOKIE == param.p->type)
|
if (SCTP_PARAM_STATE_COOKIE == param.p->type)
|
has_cookie = 1;
|
has_cookie = 1;
|
|
|
} /* for (loop through all parameters) */
|
} /* for (loop through all parameters) */
|
|
|
/* The only missing mandatory param possible today is
|
/* The only missing mandatory param possible today is
|
* the state cookie for an INIT-ACK chunk.
|
* the state cookie for an INIT-ACK chunk.
|
*/
|
*/
|
if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) {
|
if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) {
|
sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
|
sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
|
chunk, errp);
|
chunk, errp);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Find unrecognized parameters. */
|
/* Find unrecognized parameters. */
|
|
|
sctp_walk_params(param, peer_init, init_hdr.params) {
|
sctp_walk_params(param, peer_init, init_hdr.params) {
|
|
|
if (!sctp_verify_param(asoc, param, cid, chunk, errp)) {
|
if (!sctp_verify_param(asoc, param, cid, chunk, errp)) {
|
if (SCTP_PARAM_HOST_NAME_ADDRESS == param.p->type)
|
if (SCTP_PARAM_HOST_NAME_ADDRESS == param.p->type)
|
return 0;
|
return 0;
|
else
|
else
|
return 1;
|
return 1;
|
}
|
}
|
|
|
} /* for (loop through all parameters) */
|
} /* for (loop through all parameters) */
|
|
|
return 1;
|
return 1;
|
}
|
}
|
|
|
/* Unpack the parameters in an INIT packet into an association.
|
/* Unpack the parameters in an INIT packet into an association.
|
* Returns 0 on failure, else success.
|
* Returns 0 on failure, else success.
|
* FIXME: This is an association method.
|
* FIXME: This is an association method.
|
*/
|
*/
|
int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid,
|
int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid,
|
const union sctp_addr *peer_addr,
|
const union sctp_addr *peer_addr,
|
sctp_init_chunk_t *peer_init, int gfp)
|
sctp_init_chunk_t *peer_init, int gfp)
|
{
|
{
|
union sctp_params param;
|
union sctp_params param;
|
struct sctp_transport *transport;
|
struct sctp_transport *transport;
|
struct list_head *pos, *temp;
|
struct list_head *pos, *temp;
|
char *cookie;
|
char *cookie;
|
|
|
/* We must include the address that the INIT packet came from.
|
/* We must include the address that the INIT packet came from.
|
* This is the only address that matters for an INIT packet.
|
* This is the only address that matters for an INIT packet.
|
* When processing a COOKIE ECHO, we retrieve the from address
|
* When processing a COOKIE ECHO, we retrieve the from address
|
* of the INIT from the cookie.
|
* of the INIT from the cookie.
|
*/
|
*/
|
|
|
/* This implementation defaults to making the first transport
|
/* This implementation defaults to making the first transport
|
* added as the primary transport. The source address seems to
|
* added as the primary transport. The source address seems to
|
* be a a better choice than any of the embedded addresses.
|
* be a a better choice than any of the embedded addresses.
|
*/
|
*/
|
if (peer_addr)
|
if (peer_addr)
|
if(!sctp_assoc_add_peer(asoc, peer_addr, gfp))
|
if(!sctp_assoc_add_peer(asoc, peer_addr, gfp))
|
goto nomem;
|
goto nomem;
|
|
|
/* Process the initialization parameters. */
|
/* Process the initialization parameters. */
|
|
|
sctp_walk_params(param, peer_init, init_hdr.params) {
|
sctp_walk_params(param, peer_init, init_hdr.params) {
|
|
|
if (!sctp_process_param(asoc, param, peer_addr, gfp))
|
if (!sctp_process_param(asoc, param, peer_addr, gfp))
|
goto clean_up;
|
goto clean_up;
|
}
|
}
|
|
|
/* The fixed INIT headers are always in network byte
|
/* The fixed INIT headers are always in network byte
|
* order.
|
* order.
|
*/
|
*/
|
asoc->peer.i.init_tag =
|
asoc->peer.i.init_tag =
|
ntohl(peer_init->init_hdr.init_tag);
|
ntohl(peer_init->init_hdr.init_tag);
|
asoc->peer.i.a_rwnd =
|
asoc->peer.i.a_rwnd =
|
ntohl(peer_init->init_hdr.a_rwnd);
|
ntohl(peer_init->init_hdr.a_rwnd);
|
asoc->peer.i.num_outbound_streams =
|
asoc->peer.i.num_outbound_streams =
|
ntohs(peer_init->init_hdr.num_outbound_streams);
|
ntohs(peer_init->init_hdr.num_outbound_streams);
|
asoc->peer.i.num_inbound_streams =
|
asoc->peer.i.num_inbound_streams =
|
ntohs(peer_init->init_hdr.num_inbound_streams);
|
ntohs(peer_init->init_hdr.num_inbound_streams);
|
asoc->peer.i.initial_tsn =
|
asoc->peer.i.initial_tsn =
|
ntohl(peer_init->init_hdr.initial_tsn);
|
ntohl(peer_init->init_hdr.initial_tsn);
|
|
|
/* Apply the upper bounds for output streams based on peer's
|
/* Apply the upper bounds for output streams based on peer's
|
* number of inbound streams.
|
* number of inbound streams.
|
*/
|
*/
|
if (asoc->c.sinit_num_ostreams >
|
if (asoc->c.sinit_num_ostreams >
|
ntohs(peer_init->init_hdr.num_inbound_streams)) {
|
ntohs(peer_init->init_hdr.num_inbound_streams)) {
|
asoc->c.sinit_num_ostreams =
|
asoc->c.sinit_num_ostreams =
|
ntohs(peer_init->init_hdr.num_inbound_streams);
|
ntohs(peer_init->init_hdr.num_inbound_streams);
|
}
|
}
|
|
|
if (asoc->c.sinit_max_instreams >
|
if (asoc->c.sinit_max_instreams >
|
ntohs(peer_init->init_hdr.num_outbound_streams)) {
|
ntohs(peer_init->init_hdr.num_outbound_streams)) {
|
asoc->c.sinit_max_instreams =
|
asoc->c.sinit_max_instreams =
|
ntohs(peer_init->init_hdr.num_outbound_streams);
|
ntohs(peer_init->init_hdr.num_outbound_streams);
|
}
|
}
|
|
|
/* Copy Initiation tag from INIT to VT_peer in cookie. */
|
/* Copy Initiation tag from INIT to VT_peer in cookie. */
|
asoc->c.peer_vtag = asoc->peer.i.init_tag;
|
asoc->c.peer_vtag = asoc->peer.i.init_tag;
|
|
|
/* Peer Rwnd : Current calculated value of the peer's rwnd. */
|
/* Peer Rwnd : Current calculated value of the peer's rwnd. */
|
asoc->peer.rwnd = asoc->peer.i.a_rwnd;
|
asoc->peer.rwnd = asoc->peer.i.a_rwnd;
|
|
|
/* Copy cookie in case we need to resend COOKIE-ECHO. */
|
/* Copy cookie in case we need to resend COOKIE-ECHO. */
|
cookie = asoc->peer.cookie;
|
cookie = asoc->peer.cookie;
|
if (cookie) {
|
if (cookie) {
|
asoc->peer.cookie = kmalloc(asoc->peer.cookie_len, gfp);
|
asoc->peer.cookie = kmalloc(asoc->peer.cookie_len, gfp);
|
if (!asoc->peer.cookie)
|
if (!asoc->peer.cookie)
|
goto clean_up;
|
goto clean_up;
|
memcpy(asoc->peer.cookie, cookie, asoc->peer.cookie_len);
|
memcpy(asoc->peer.cookie, cookie, asoc->peer.cookie_len);
|
}
|
}
|
|
|
/* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
|
/* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
|
* high (for example, implementations MAY use the size of the receiver
|
* high (for example, implementations MAY use the size of the receiver
|
* advertised window).
|
* advertised window).
|
*/
|
*/
|
list_for_each(pos, &asoc->peer.transport_addr_list) {
|
list_for_each(pos, &asoc->peer.transport_addr_list) {
|
transport = list_entry(pos, struct sctp_transport, transports);
|
transport = list_entry(pos, struct sctp_transport, transports);
|
transport->ssthresh = asoc->peer.i.a_rwnd;
|
transport->ssthresh = asoc->peer.i.a_rwnd;
|
}
|
}
|
|
|
/* Set up the TSN tracking pieces. */
|
/* Set up the TSN tracking pieces. */
|
sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_SIZE,
|
sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_SIZE,
|
asoc->peer.i.initial_tsn);
|
asoc->peer.i.initial_tsn);
|
|
|
/* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
|
/* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
|
*
|
*
|
* The stream sequence number in all the streams shall start
|
* The stream sequence number in all the streams shall start
|
* from 0 when the association is established. Also, when the
|
* from 0 when the association is established. Also, when the
|
* stream sequence number reaches the value 65535 the next
|
* stream sequence number reaches the value 65535 the next
|
* stream sequence number shall be set to 0.
|
* stream sequence number shall be set to 0.
|
*/
|
*/
|
|
|
/* Allocate storage for the negotiated streams if it is not a temporary * association.
|
/* Allocate storage for the negotiated streams if it is not a temporary * association.
|
*/
|
*/
|
if (!asoc->temp) {
|
if (!asoc->temp) {
|
asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams,
|
asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams,
|
asoc->c.sinit_num_ostreams, gfp);
|
asoc->c.sinit_num_ostreams, gfp);
|
if (!asoc->ssnmap)
|
if (!asoc->ssnmap)
|
goto nomem_ssnmap;
|
goto nomem_ssnmap;
|
}
|
}
|
|
|
/* ADDIP Section 4.1 ASCONF Chunk Procedures
|
/* ADDIP Section 4.1 ASCONF Chunk Procedures
|
*
|
*
|
* When an endpoint has an ASCONF signaled change to be sent to the
|
* When an endpoint has an ASCONF signaled change to be sent to the
|
* remote endpoint it should do the following:
|
* remote endpoint it should do the following:
|
* ...
|
* ...
|
* A2) A serial number should be assigned to the Chunk. The serial
|
* A2) A serial number should be assigned to the Chunk. The serial
|
* number should be a monotonically increasing number. All serial
|
* number should be a monotonically increasing number. All serial
|
* numbers are defined to be initialized at the start of the
|
* numbers are defined to be initialized at the start of the
|
* association to the same value as the Initial TSN.
|
* association to the same value as the Initial TSN.
|
*/
|
*/
|
asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
|
asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
|
return 1;
|
return 1;
|
|
|
nomem_ssnmap:
|
nomem_ssnmap:
|
clean_up:
|
clean_up:
|
/* Release the transport structures. */
|
/* Release the transport structures. */
|
list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
|
list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
|
transport = list_entry(pos, struct sctp_transport, transports);
|
transport = list_entry(pos, struct sctp_transport, transports);
|
list_del_init(pos);
|
list_del_init(pos);
|
sctp_transport_free(transport);
|
sctp_transport_free(transport);
|
}
|
}
|
nomem:
|
nomem:
|
return 0;
|
return 0;
|
}
|
}
|
|
|
|
|
/* Update asoc with the option described in param.
|
/* Update asoc with the option described in param.
|
*
|
*
|
* RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
|
* RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
|
*
|
*
|
* asoc is the association to update.
|
* asoc is the association to update.
|
* param is the variable length parameter to use for update.
|
* param is the variable length parameter to use for update.
|
* cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
|
* cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
|
* If the current packet is an INIT we want to minimize the amount of
|
* If the current packet is an INIT we want to minimize the amount of
|
* work we do. In particular, we should not build transport
|
* work we do. In particular, we should not build transport
|
* structures for the addresses.
|
* structures for the addresses.
|
*/
|
*/
|
int sctp_process_param(struct sctp_association *asoc, union sctp_params param,
|
int sctp_process_param(struct sctp_association *asoc, union sctp_params param,
|
const union sctp_addr *peer_addr, int gfp)
|
const union sctp_addr *peer_addr, int gfp)
|
{
|
{
|
union sctp_addr addr;
|
union sctp_addr addr;
|
int i;
|
int i;
|
__u16 sat;
|
__u16 sat;
|
int retval = 1;
|
int retval = 1;
|
sctp_scope_t scope;
|
sctp_scope_t scope;
|
time_t stale;
|
time_t stale;
|
struct sctp_af *af;
|
struct sctp_af *af;
|
|
|
/* We maintain all INIT parameters in network byte order all the
|
/* We maintain all INIT parameters in network byte order all the
|
* time. This allows us to not worry about whether the parameters
|
* time. This allows us to not worry about whether the parameters
|
* came from a fresh INIT, and INIT ACK, or were stored in a cookie.
|
* came from a fresh INIT, and INIT ACK, or were stored in a cookie.
|
*/
|
*/
|
switch (param.p->type) {
|
switch (param.p->type) {
|
case SCTP_PARAM_IPV6_ADDRESS:
|
case SCTP_PARAM_IPV6_ADDRESS:
|
if (PF_INET6 != asoc->base.sk->sk_family)
|
if (PF_INET6 != asoc->base.sk->sk_family)
|
break;
|
break;
|
/* Fall through. */
|
/* Fall through. */
|
case SCTP_PARAM_IPV4_ADDRESS:
|
case SCTP_PARAM_IPV4_ADDRESS:
|
af = sctp_get_af_specific(param_type2af(param.p->type));
|
af = sctp_get_af_specific(param_type2af(param.p->type));
|
af->from_addr_param(&addr, param.addr, asoc->peer.port, 0);
|
af->from_addr_param(&addr, param.addr, asoc->peer.port, 0);
|
scope = sctp_scope(peer_addr);
|
scope = sctp_scope(peer_addr);
|
if (sctp_in_scope(&addr, scope))
|
if (sctp_in_scope(&addr, scope))
|
if (!sctp_assoc_add_peer(asoc, &addr, gfp))
|
if (!sctp_assoc_add_peer(asoc, &addr, gfp))
|
return 0;
|
return 0;
|
break;
|
break;
|
|
|
case SCTP_PARAM_COOKIE_PRESERVATIVE:
|
case SCTP_PARAM_COOKIE_PRESERVATIVE:
|
if (!sctp_cookie_preserve_enable)
|
if (!sctp_cookie_preserve_enable)
|
break;
|
break;
|
|
|
stale = ntohl(param.life->lifespan_increment);
|
stale = ntohl(param.life->lifespan_increment);
|
|
|
/* Suggested Cookie Life span increment's unit is msec,
|
/* Suggested Cookie Life span increment's unit is msec,
|
* (1/1000sec).
|
* (1/1000sec).
|
*/
|
*/
|
asoc->cookie_life.tv_sec += stale / 1000;
|
asoc->cookie_life.tv_sec += stale / 1000;
|
asoc->cookie_life.tv_usec += (stale % 1000) * 1000;
|
asoc->cookie_life.tv_usec += (stale % 1000) * 1000;
|
break;
|
break;
|
|
|
case SCTP_PARAM_HOST_NAME_ADDRESS:
|
case SCTP_PARAM_HOST_NAME_ADDRESS:
|
SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
|
SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
|
break;
|
break;
|
|
|
case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
|
case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
|
/* Turn off the default values first so we'll know which
|
/* Turn off the default values first so we'll know which
|
* ones are really set by the peer.
|
* ones are really set by the peer.
|
*/
|
*/
|
asoc->peer.ipv4_address = 0;
|
asoc->peer.ipv4_address = 0;
|
asoc->peer.ipv6_address = 0;
|
asoc->peer.ipv6_address = 0;
|
|
|
/* Cycle through address types; avoid divide by 0. */
|
/* Cycle through address types; avoid divide by 0. */
|
sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
|
sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
|
if (sat)
|
if (sat)
|
sat /= sizeof(__u16);
|
sat /= sizeof(__u16);
|
|
|
for (i = 0; i < sat; ++i) {
|
for (i = 0; i < sat; ++i) {
|
switch (param.sat->types[i]) {
|
switch (param.sat->types[i]) {
|
case SCTP_PARAM_IPV4_ADDRESS:
|
case SCTP_PARAM_IPV4_ADDRESS:
|
asoc->peer.ipv4_address = 1;
|
asoc->peer.ipv4_address = 1;
|
break;
|
break;
|
|
|
case SCTP_PARAM_IPV6_ADDRESS:
|
case SCTP_PARAM_IPV6_ADDRESS:
|
asoc->peer.ipv6_address = 1;
|
asoc->peer.ipv6_address = 1;
|
break;
|
break;
|
|
|
case SCTP_PARAM_HOST_NAME_ADDRESS:
|
case SCTP_PARAM_HOST_NAME_ADDRESS:
|
asoc->peer.hostname_address = 1;
|
asoc->peer.hostname_address = 1;
|
break;
|
break;
|
|
|
default: /* Just ignore anything else. */
|
default: /* Just ignore anything else. */
|
break;
|
break;
|
};
|
};
|
}
|
}
|
break;
|
break;
|
|
|
case SCTP_PARAM_STATE_COOKIE:
|
case SCTP_PARAM_STATE_COOKIE:
|
asoc->peer.cookie_len =
|
asoc->peer.cookie_len =
|
ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
|
ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
|
asoc->peer.cookie = param.cookie->body;
|
asoc->peer.cookie = param.cookie->body;
|
break;
|
break;
|
|
|
case SCTP_PARAM_HEARTBEAT_INFO:
|
case SCTP_PARAM_HEARTBEAT_INFO:
|
/* Would be odd to receive, but it causes no problems. */
|
/* Would be odd to receive, but it causes no problems. */
|
break;
|
break;
|
|
|
case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
|
case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
|
/* Rejected during verify stage. */
|
/* Rejected during verify stage. */
|
break;
|
break;
|
|
|
case SCTP_PARAM_ECN_CAPABLE:
|
case SCTP_PARAM_ECN_CAPABLE:
|
asoc->peer.ecn_capable = 1;
|
asoc->peer.ecn_capable = 1;
|
break;
|
break;
|
|
|
default:
|
default:
|
/* Any unrecognized parameters should have been caught
|
/* Any unrecognized parameters should have been caught
|
* and handled by sctp_verify_param() which should be
|
* and handled by sctp_verify_param() which should be
|
* called prior to this routine. Simply log the error
|
* called prior to this routine. Simply log the error
|
* here.
|
* here.
|
*/
|
*/
|
SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
|
SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
|
ntohs(param.p->type), asoc);
|
ntohs(param.p->type), asoc);
|
break;
|
break;
|
};
|
};
|
|
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Select a new verification tag. */
|
/* Select a new verification tag. */
|
__u32 sctp_generate_tag(const struct sctp_endpoint *ep)
|
__u32 sctp_generate_tag(const struct sctp_endpoint *ep)
|
{
|
{
|
/* I believe that this random number generator complies with RFC1750.
|
/* I believe that this random number generator complies with RFC1750.
|
* A tag of 0 is reserved for special cases (e.g. INIT).
|
* A tag of 0 is reserved for special cases (e.g. INIT).
|
*/
|
*/
|
__u32 x;
|
__u32 x;
|
|
|
do {
|
do {
|
get_random_bytes(&x, sizeof(__u32));
|
get_random_bytes(&x, sizeof(__u32));
|
} while (x == 0);
|
} while (x == 0);
|
|
|
return x;
|
return x;
|
}
|
}
|
|
|
/* Select an initial TSN to send during startup. */
|
/* Select an initial TSN to send during startup. */
|
__u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
|
__u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
|
{
|
{
|
__u32 retval;
|
__u32 retval;
|
|
|
get_random_bytes(&retval, sizeof(__u32));
|
get_random_bytes(&retval, sizeof(__u32));
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/*
|
/*
|
* ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
|
* ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
|
* 0 1 2 3
|
* 0 1 2 3
|
* 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
|
* 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
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Type = 0xC1 | Chunk Flags | Chunk Length |
|
* | Type = 0xC1 | Chunk Flags | Chunk Length |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Serial Number |
|
* | Serial Number |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Address Parameter |
|
* | Address Parameter |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | ASCONF Parameter #1 |
|
* | ASCONF Parameter #1 |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* \ \
|
* \ \
|
* / .... /
|
* / .... /
|
* \ \
|
* \ \
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | ASCONF Parameter #N |
|
* | ASCONF Parameter #N |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
*
|
*
|
* Address Parameter and other parameter will not be wrapped in this function
|
* Address Parameter and other parameter will not be wrapped in this function
|
*/
|
*/
|
struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
|
union sctp_addr *addr, int vparam_len)
|
union sctp_addr *addr, int vparam_len)
|
{
|
{
|
sctp_addiphdr_t asconf;
|
sctp_addiphdr_t asconf;
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
int length = sizeof(asconf) + vparam_len;
|
int length = sizeof(asconf) + vparam_len;
|
union sctp_addr_param addrparam;
|
union sctp_addr_param addrparam;
|
int addrlen;
|
int addrlen;
|
struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
|
struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
|
|
|
addrlen = af->to_addr_param(addr, &addrparam);
|
addrlen = af->to_addr_param(addr, &addrparam);
|
if (!addrlen)
|
if (!addrlen)
|
return NULL;
|
return NULL;
|
length += addrlen;
|
length += addrlen;
|
|
|
/* Create the chunk. */
|
/* Create the chunk. */
|
retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length);
|
retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length);
|
if (!retval)
|
if (!retval)
|
return NULL;
|
return NULL;
|
|
|
asconf.serial = htonl(asoc->addip_serial++);
|
asconf.serial = htonl(asoc->addip_serial++);
|
|
|
retval->subh.addip_hdr =
|
retval->subh.addip_hdr =
|
sctp_addto_chunk(retval, sizeof(asconf), &asconf);
|
sctp_addto_chunk(retval, sizeof(asconf), &asconf);
|
retval->param_hdr.v =
|
retval->param_hdr.v =
|
sctp_addto_chunk(retval, addrlen, &addrparam);
|
sctp_addto_chunk(retval, addrlen, &addrparam);
|
|
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* ADDIP
|
/* ADDIP
|
* 3.2.1 Add IP Address
|
* 3.2.1 Add IP Address
|
* 0 1 2 3
|
* 0 1 2 3
|
* 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
|
* 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
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Type = 0xC001 | Length = Variable |
|
* | Type = 0xC001 | Length = Variable |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | ASCONF-Request Correlation ID |
|
* | ASCONF-Request Correlation ID |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Address Parameter |
|
* | Address Parameter |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
*
|
*
|
* 3.2.2 Delete IP Address
|
* 3.2.2 Delete IP Address
|
* 0 1 2 3
|
* 0 1 2 3
|
* 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
|
* 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
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Type = 0xC002 | Length = Variable |
|
* | Type = 0xC002 | Length = Variable |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | ASCONF-Request Correlation ID |
|
* | ASCONF-Request Correlation ID |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Address Parameter |
|
* | Address Parameter |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
*
|
*
|
*/
|
*/
|
struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
|
union sctp_addr *laddr,
|
union sctp_addr *laddr,
|
struct sockaddr *addrs,
|
struct sockaddr *addrs,
|
int addrcnt,
|
int addrcnt,
|
__u16 flags)
|
__u16 flags)
|
{
|
{
|
sctp_addip_param_t param;
|
sctp_addip_param_t param;
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
union sctp_addr_param addr_param;
|
union sctp_addr_param addr_param;
|
union sctp_addr *addr;
|
union sctp_addr *addr;
|
void *addr_buf;
|
void *addr_buf;
|
struct sctp_af *af;
|
struct sctp_af *af;
|
int paramlen = sizeof(param);
|
int paramlen = sizeof(param);
|
int addr_param_len = 0;
|
int addr_param_len = 0;
|
int totallen = 0;
|
int totallen = 0;
|
int i;
|
int i;
|
|
|
/* Get total length of all the address parameters. */
|
/* Get total length of all the address parameters. */
|
addr_buf = addrs;
|
addr_buf = addrs;
|
for (i = 0; i < addrcnt; i++) {
|
for (i = 0; i < addrcnt; i++) {
|
addr = (union sctp_addr *)addr_buf;
|
addr = (union sctp_addr *)addr_buf;
|
af = sctp_get_af_specific(addr->v4.sin_family);
|
af = sctp_get_af_specific(addr->v4.sin_family);
|
addr_param_len = af->to_addr_param(addr, &addr_param);
|
addr_param_len = af->to_addr_param(addr, &addr_param);
|
|
|
totallen += paramlen;
|
totallen += paramlen;
|
totallen += addr_param_len;
|
totallen += addr_param_len;
|
|
|
addr_buf += af->sockaddr_len;
|
addr_buf += af->sockaddr_len;
|
}
|
}
|
|
|
/* Create an asconf chunk with the required length. */
|
/* Create an asconf chunk with the required length. */
|
retval = sctp_make_asconf(asoc, laddr, totallen);
|
retval = sctp_make_asconf(asoc, laddr, totallen);
|
if (!retval)
|
if (!retval)
|
return NULL;
|
return NULL;
|
|
|
/* Add the address parameters to the asconf chunk. */
|
/* Add the address parameters to the asconf chunk. */
|
addr_buf = addrs;
|
addr_buf = addrs;
|
for (i = 0; i < addrcnt; i++) {
|
for (i = 0; i < addrcnt; i++) {
|
addr = (union sctp_addr *)addr_buf;
|
addr = (union sctp_addr *)addr_buf;
|
af = sctp_get_af_specific(addr->v4.sin_family);
|
af = sctp_get_af_specific(addr->v4.sin_family);
|
addr_param_len = af->to_addr_param(addr, &addr_param);
|
addr_param_len = af->to_addr_param(addr, &addr_param);
|
param.param_hdr.type = flags;
|
param.param_hdr.type = flags;
|
param.param_hdr.length = htons(paramlen + addr_param_len);
|
param.param_hdr.length = htons(paramlen + addr_param_len);
|
param.crr_id = i;
|
param.crr_id = i;
|
|
|
sctp_addto_chunk(retval, paramlen, ¶m);
|
sctp_addto_chunk(retval, paramlen, ¶m);
|
sctp_addto_chunk(retval, addr_param_len, &addr_param);
|
sctp_addto_chunk(retval, addr_param_len, &addr_param);
|
|
|
addr_buf += af->sockaddr_len;
|
addr_buf += af->sockaddr_len;
|
}
|
}
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* ADDIP
|
/* ADDIP
|
* 3.2.4 Set Primary IP Address
|
* 3.2.4 Set Primary IP Address
|
* 0 1 2 3
|
* 0 1 2 3
|
* 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
|
* 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
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Type =0xC004 | Length = Variable |
|
* | Type =0xC004 | Length = Variable |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | ASCONF-Request Correlation ID |
|
* | ASCONF-Request Correlation ID |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Address Parameter |
|
* | Address Parameter |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
*
|
*
|
* Create an ASCONF chunk with Set Primary IP address parameter.
|
* Create an ASCONF chunk with Set Primary IP address parameter.
|
*/
|
*/
|
struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
|
union sctp_addr *addr)
|
union sctp_addr *addr)
|
{
|
{
|
sctp_addip_param_t param;
|
sctp_addip_param_t param;
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
int len = sizeof(param);
|
int len = sizeof(param);
|
union sctp_addr_param addrparam;
|
union sctp_addr_param addrparam;
|
int addrlen;
|
int addrlen;
|
struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
|
struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
|
|
|
addrlen = af->to_addr_param(addr, &addrparam);
|
addrlen = af->to_addr_param(addr, &addrparam);
|
if (!addrlen)
|
if (!addrlen)
|
return NULL;
|
return NULL;
|
len += addrlen;
|
len += addrlen;
|
|
|
/* Create the chunk and make asconf header. */
|
/* Create the chunk and make asconf header. */
|
retval = sctp_make_asconf(asoc, addr, len);
|
retval = sctp_make_asconf(asoc, addr, len);
|
if (!retval)
|
if (!retval)
|
return NULL;
|
return NULL;
|
|
|
param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
|
param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
|
param.param_hdr.length = htons(len);
|
param.param_hdr.length = htons(len);
|
param.crr_id = 0;
|
param.crr_id = 0;
|
|
|
sctp_addto_chunk(retval, sizeof(param), ¶m);
|
sctp_addto_chunk(retval, sizeof(param), ¶m);
|
sctp_addto_chunk(retval, addrlen, &addrparam);
|
sctp_addto_chunk(retval, addrlen, &addrparam);
|
|
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
|
/* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
|
* 0 1 2 3
|
* 0 1 2 3
|
* 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
|
* 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
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Type = 0x80 | Chunk Flags | Chunk Length |
|
* | Type = 0x80 | Chunk Flags | Chunk Length |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | Serial Number |
|
* | Serial Number |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | ASCONF Parameter Response#1 |
|
* | ASCONF Parameter Response#1 |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* \ \
|
* \ \
|
* / .... /
|
* / .... /
|
* \ \
|
* \ \
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* | ASCONF Parameter Response#N |
|
* | ASCONF Parameter Response#N |
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
*
|
*
|
* Create an ASCONF_ACK chunk with enough space for the parameter responses.
|
* Create an ASCONF_ACK chunk with enough space for the parameter responses.
|
*/
|
*/
|
struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
|
struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
|
__u32 serial, int vparam_len)
|
__u32 serial, int vparam_len)
|
{
|
{
|
sctp_addiphdr_t asconf;
|
sctp_addiphdr_t asconf;
|
struct sctp_chunk *retval;
|
struct sctp_chunk *retval;
|
int length = sizeof(asconf) + vparam_len;
|
int length = sizeof(asconf) + vparam_len;
|
|
|
/* Create the chunk. */
|
/* Create the chunk. */
|
retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length);
|
retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length);
|
if (!retval)
|
if (!retval)
|
return NULL;
|
return NULL;
|
|
|
asconf.serial = htonl(serial);
|
asconf.serial = htonl(serial);
|
|
|
retval->subh.addip_hdr =
|
retval->subh.addip_hdr =
|
sctp_addto_chunk(retval, sizeof(asconf), &asconf);
|
sctp_addto_chunk(retval, sizeof(asconf), &asconf);
|
|
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Add response parameters to an ASCONF_ACK chunk. */
|
/* Add response parameters to an ASCONF_ACK chunk. */
|
static void sctp_add_asconf_response(struct sctp_chunk *chunk, __u32 crr_id,
|
static void sctp_add_asconf_response(struct sctp_chunk *chunk, __u32 crr_id,
|
__u16 err_code, sctp_addip_param_t *asconf_param)
|
__u16 err_code, sctp_addip_param_t *asconf_param)
|
{
|
{
|
sctp_addip_param_t ack_param;
|
sctp_addip_param_t ack_param;
|
sctp_errhdr_t err_param;
|
sctp_errhdr_t err_param;
|
int asconf_param_len = 0;
|
int asconf_param_len = 0;
|
int err_param_len = 0;
|
int err_param_len = 0;
|
__u16 response_type;
|
__u16 response_type;
|
|
|
if (SCTP_ERROR_NO_ERROR == err_code) {
|
if (SCTP_ERROR_NO_ERROR == err_code) {
|
response_type = SCTP_PARAM_SUCCESS_REPORT;
|
response_type = SCTP_PARAM_SUCCESS_REPORT;
|
} else {
|
} else {
|
response_type = SCTP_PARAM_ERR_CAUSE;
|
response_type = SCTP_PARAM_ERR_CAUSE;
|
err_param_len = sizeof(err_param);
|
err_param_len = sizeof(err_param);
|
if (asconf_param)
|
if (asconf_param)
|
asconf_param_len =
|
asconf_param_len =
|
ntohs(asconf_param->param_hdr.length);
|
ntohs(asconf_param->param_hdr.length);
|
}
|
}
|
|
|
/* Add Success Indication or Error Cause Indication parameter. */
|
/* Add Success Indication or Error Cause Indication parameter. */
|
ack_param.param_hdr.type = response_type;
|
ack_param.param_hdr.type = response_type;
|
ack_param.param_hdr.length = htons(sizeof(ack_param) +
|
ack_param.param_hdr.length = htons(sizeof(ack_param) +
|
err_param_len +
|
err_param_len +
|
asconf_param_len);
|
asconf_param_len);
|
ack_param.crr_id = crr_id;
|
ack_param.crr_id = crr_id;
|
sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
|
sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
|
|
|
if (SCTP_ERROR_NO_ERROR == err_code)
|
if (SCTP_ERROR_NO_ERROR == err_code)
|
return;
|
return;
|
|
|
/* Add Error Cause parameter. */
|
/* Add Error Cause parameter. */
|
err_param.cause = err_code;
|
err_param.cause = err_code;
|
err_param.length = htons(err_param_len + asconf_param_len);
|
err_param.length = htons(err_param_len + asconf_param_len);
|
sctp_addto_chunk(chunk, err_param_len, &err_param);
|
sctp_addto_chunk(chunk, err_param_len, &err_param);
|
|
|
/* Add the failed TLV copied from ASCONF chunk. */
|
/* Add the failed TLV copied from ASCONF chunk. */
|
if (asconf_param)
|
if (asconf_param)
|
sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
|
sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
|
}
|
}
|
|
|
/* Process a asconf parameter. */
|
/* Process a asconf parameter. */
|
static __u16 sctp_process_asconf_param(struct sctp_association *asoc,
|
static __u16 sctp_process_asconf_param(struct sctp_association *asoc,
|
struct sctp_chunk *asconf,
|
struct sctp_chunk *asconf,
|
sctp_addip_param_t *asconf_param)
|
sctp_addip_param_t *asconf_param)
|
{
|
{
|
struct sctp_transport *peer;
|
struct sctp_transport *peer;
|
struct sctp_af *af;
|
struct sctp_af *af;
|
union sctp_addr addr;
|
union sctp_addr addr;
|
struct list_head *pos;
|
struct list_head *pos;
|
union sctp_addr_param *addr_param;
|
union sctp_addr_param *addr_param;
|
|
|
addr_param = (union sctp_addr_param *)
|
addr_param = (union sctp_addr_param *)
|
((void *)asconf_param + sizeof(sctp_addip_param_t));
|
((void *)asconf_param + sizeof(sctp_addip_param_t));
|
|
|
af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
|
af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
|
if (unlikely(!af))
|
if (unlikely(!af))
|
return SCTP_ERROR_INV_PARAM;
|
return SCTP_ERROR_INV_PARAM;
|
|
|
af->from_addr_param(&addr, addr_param, asoc->peer.port, 0);
|
af->from_addr_param(&addr, addr_param, asoc->peer.port, 0);
|
switch (asconf_param->param_hdr.type) {
|
switch (asconf_param->param_hdr.type) {
|
case SCTP_PARAM_ADD_IP:
|
case SCTP_PARAM_ADD_IP:
|
/* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
|
/* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
|
* request and does not have the local resources to add this
|
* request and does not have the local resources to add this
|
* new address to the association, it MUST return an Error
|
* new address to the association, it MUST return an Error
|
* Cause TLV set to the new error code 'Operation Refused
|
* Cause TLV set to the new error code 'Operation Refused
|
* Due to Resource Shortage'.
|
* Due to Resource Shortage'.
|
*/
|
*/
|
|
|
peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC);
|
peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC);
|
if (!peer)
|
if (!peer)
|
return SCTP_ERROR_RSRC_LOW;
|
return SCTP_ERROR_RSRC_LOW;
|
|
|
/* Start the heartbeat timer. */
|
/* Start the heartbeat timer. */
|
if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
|
if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
|
sctp_transport_hold(peer);
|
sctp_transport_hold(peer);
|
break;
|
break;
|
case SCTP_PARAM_DEL_IP:
|
case SCTP_PARAM_DEL_IP:
|
/* ADDIP 4.3 D7) If a request is received to delete the
|
/* ADDIP 4.3 D7) If a request is received to delete the
|
* last remaining IP address of a peer endpoint, the receiver
|
* last remaining IP address of a peer endpoint, the receiver
|
* MUST send an Error Cause TLV with the error cause set to the
|
* MUST send an Error Cause TLV with the error cause set to the
|
* new error code 'Request to Delete Last Remaining IP Address'.
|
* new error code 'Request to Delete Last Remaining IP Address'.
|
*/
|
*/
|
pos = asoc->peer.transport_addr_list.next;
|
pos = asoc->peer.transport_addr_list.next;
|
if (pos->next == &asoc->peer.transport_addr_list)
|
if (pos->next == &asoc->peer.transport_addr_list)
|
return SCTP_ERROR_DEL_LAST_IP;
|
return SCTP_ERROR_DEL_LAST_IP;
|
|
|
/* ADDIP 4.3 D8) If a request is received to delete an IP
|
/* ADDIP 4.3 D8) If a request is received to delete an IP
|
* address which is also the source address of the IP packet
|
* address which is also the source address of the IP packet
|
* which contained the ASCONF chunk, the receiver MUST reject
|
* which contained the ASCONF chunk, the receiver MUST reject
|
* this request. To reject the request the receiver MUST send
|
* this request. To reject the request the receiver MUST send
|
* an Error Cause TLV set to the new error code 'Request to
|
* an Error Cause TLV set to the new error code 'Request to
|
* Delete Source IP Address'
|
* Delete Source IP Address'
|
*/
|
*/
|
if (sctp_cmp_addr_exact(sctp_source(asconf), &addr))
|
if (sctp_cmp_addr_exact(sctp_source(asconf), &addr))
|
return SCTP_ERROR_DEL_SRC_IP;
|
return SCTP_ERROR_DEL_SRC_IP;
|
|
|
sctp_assoc_del_peer(asoc, &addr);
|
sctp_assoc_del_peer(asoc, &addr);
|
break;
|
break;
|
case SCTP_PARAM_SET_PRIMARY:
|
case SCTP_PARAM_SET_PRIMARY:
|
peer = sctp_assoc_lookup_paddr(asoc, &addr);
|
peer = sctp_assoc_lookup_paddr(asoc, &addr);
|
if (!peer)
|
if (!peer)
|
return SCTP_ERROR_INV_PARAM;
|
return SCTP_ERROR_INV_PARAM;
|
|
|
sctp_assoc_set_primary(asoc, peer);
|
sctp_assoc_set_primary(asoc, peer);
|
break;
|
break;
|
default:
|
default:
|
return SCTP_ERROR_INV_PARAM;
|
return SCTP_ERROR_INV_PARAM;
|
break;
|
break;
|
}
|
}
|
|
|
return SCTP_ERROR_NO_ERROR;
|
return SCTP_ERROR_NO_ERROR;
|
}
|
}
|
|
|
/* Process an incoming ASCONF chunk with the next expected serial no. and
|
/* Process an incoming ASCONF chunk with the next expected serial no. and
|
* return an ASCONF_ACK chunk to be sent in response.
|
* return an ASCONF_ACK chunk to be sent in response.
|
*/
|
*/
|
struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
|
struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
|
struct sctp_chunk *asconf)
|
struct sctp_chunk *asconf)
|
{
|
{
|
sctp_addiphdr_t *hdr;
|
sctp_addiphdr_t *hdr;
|
union sctp_addr_param *addr_param;
|
union sctp_addr_param *addr_param;
|
sctp_addip_param_t *asconf_param;
|
sctp_addip_param_t *asconf_param;
|
struct sctp_chunk *asconf_ack;
|
struct sctp_chunk *asconf_ack;
|
|
|
__u16 err_code;
|
__u16 err_code;
|
int length = 0;
|
int length = 0;
|
int chunk_len = asconf->skb->len;
|
int chunk_len = asconf->skb->len;
|
__u32 serial;
|
__u32 serial;
|
int all_param_pass = 1;
|
int all_param_pass = 1;
|
|
|
hdr = (sctp_addiphdr_t *)asconf->skb->data;
|
hdr = (sctp_addiphdr_t *)asconf->skb->data;
|
serial = ntohl(hdr->serial);
|
serial = ntohl(hdr->serial);
|
|
|
/* Skip the addiphdr and store a pointer to address parameter. */
|
/* Skip the addiphdr and store a pointer to address parameter. */
|
length = sizeof(sctp_addiphdr_t);
|
length = sizeof(sctp_addiphdr_t);
|
addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
|
addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
|
chunk_len -= length;
|
chunk_len -= length;
|
|
|
/* Skip the address parameter and store a pointer to the first
|
/* Skip the address parameter and store a pointer to the first
|
* asconf paramter.
|
* asconf paramter.
|
*/
|
*/
|
length = ntohs(addr_param->v4.param_hdr.length);
|
length = ntohs(addr_param->v4.param_hdr.length);
|
asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
|
asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
|
chunk_len -= length;
|
chunk_len -= length;
|
|
|
/* create an ASCONF_ACK chunk.
|
/* create an ASCONF_ACK chunk.
|
* Based on the definitions of parameters, we know that the size of
|
* Based on the definitions of parameters, we know that the size of
|
* ASCONF_ACK parameters are less than or equal to the twice of ASCONF
|
* ASCONF_ACK parameters are less than or equal to the twice of ASCONF
|
* paramters.
|
* paramters.
|
*/
|
*/
|
asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2);
|
asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2);
|
if (!asconf_ack)
|
if (!asconf_ack)
|
goto done;
|
goto done;
|
|
|
/* Process the TLVs contained within the ASCONF chunk. */
|
/* Process the TLVs contained within the ASCONF chunk. */
|
while (chunk_len > 0) {
|
while (chunk_len > 0) {
|
err_code = sctp_process_asconf_param(asoc, asconf,
|
err_code = sctp_process_asconf_param(asoc, asconf,
|
asconf_param);
|
asconf_param);
|
/* ADDIP 4.1 A7)
|
/* ADDIP 4.1 A7)
|
* If an error response is received for a TLV parameter,
|
* If an error response is received for a TLV parameter,
|
* all TLVs with no response before the failed TLV are
|
* all TLVs with no response before the failed TLV are
|
* considered successful if not reported. All TLVs after
|
* considered successful if not reported. All TLVs after
|
* the failed response are considered unsuccessful unless
|
* the failed response are considered unsuccessful unless
|
* a specific success indication is present for the parameter.
|
* a specific success indication is present for the parameter.
|
*/
|
*/
|
if (SCTP_ERROR_NO_ERROR != err_code)
|
if (SCTP_ERROR_NO_ERROR != err_code)
|
all_param_pass = 0;
|
all_param_pass = 0;
|
|
|
if (!all_param_pass)
|
if (!all_param_pass)
|
sctp_add_asconf_response(asconf_ack,
|
sctp_add_asconf_response(asconf_ack,
|
asconf_param->crr_id, err_code,
|
asconf_param->crr_id, err_code,
|
asconf_param);
|
asconf_param);
|
|
|
/* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
|
/* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
|
* an IP address sends an 'Out of Resource' in its response, it
|
* an IP address sends an 'Out of Resource' in its response, it
|
* MUST also fail any subsequent add or delete requests bundled
|
* MUST also fail any subsequent add or delete requests bundled
|
* in the ASCONF.
|
* in the ASCONF.
|
*/
|
*/
|
if (SCTP_ERROR_RSRC_LOW == err_code)
|
if (SCTP_ERROR_RSRC_LOW == err_code)
|
goto done;
|
goto done;
|
|
|
/* Move to the next ASCONF param. */
|
/* Move to the next ASCONF param. */
|
length = ntohs(asconf_param->param_hdr.length);
|
length = ntohs(asconf_param->param_hdr.length);
|
asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
|
asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
|
length);
|
length);
|
chunk_len -= length;
|
chunk_len -= length;
|
}
|
}
|
|
|
done:
|
done:
|
asoc->peer.addip_serial++;
|
asoc->peer.addip_serial++;
|
|
|
/* If we are sending a new ASCONF_ACK hold a reference to it in assoc
|
/* If we are sending a new ASCONF_ACK hold a reference to it in assoc
|
* after freeing the reference to old asconf ack if any.
|
* after freeing the reference to old asconf ack if any.
|
*/
|
*/
|
if (asconf_ack) {
|
if (asconf_ack) {
|
if (asoc->addip_last_asconf_ack)
|
if (asoc->addip_last_asconf_ack)
|
sctp_chunk_free(asoc->addip_last_asconf_ack);
|
sctp_chunk_free(asoc->addip_last_asconf_ack);
|
|
|
sctp_chunk_hold(asconf_ack);
|
sctp_chunk_hold(asconf_ack);
|
asoc->addip_last_asconf_ack = asconf_ack;
|
asoc->addip_last_asconf_ack = asconf_ack;
|
}
|
}
|
|
|
return asconf_ack;
|
return asconf_ack;
|
}
|
}
|
|
|
/* Process a asconf parameter that is successfully acked. */
|
/* Process a asconf parameter that is successfully acked. */
|
static int sctp_asconf_param_success(struct sctp_association *asoc,
|
static int sctp_asconf_param_success(struct sctp_association *asoc,
|
sctp_addip_param_t *asconf_param)
|
sctp_addip_param_t *asconf_param)
|
{
|
{
|
struct sctp_af *af;
|
struct sctp_af *af;
|
union sctp_addr addr;
|
union sctp_addr addr;
|
struct sctp_bind_addr *bp = &asoc->base.bind_addr;
|
struct sctp_bind_addr *bp = &asoc->base.bind_addr;
|
union sctp_addr_param *addr_param;
|
union sctp_addr_param *addr_param;
|
int retval = 0;
|
int retval = 0;
|
|
|
addr_param = (union sctp_addr_param *)
|
addr_param = (union sctp_addr_param *)
|
((void *)asconf_param + sizeof(sctp_addip_param_t));
|
((void *)asconf_param + sizeof(sctp_addip_param_t));
|
|
|
/* We have checked the packet before, so we do not check again. */
|
/* We have checked the packet before, so we do not check again. */
|
af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
|
af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
|
af->from_addr_param(&addr, addr_param, bp->port, 0);
|
af->from_addr_param(&addr, addr_param, bp->port, 0);
|
|
|
switch (asconf_param->param_hdr.type) {
|
switch (asconf_param->param_hdr.type) {
|
case SCTP_PARAM_ADD_IP:
|
case SCTP_PARAM_ADD_IP:
|
sctp_local_bh_disable();
|
sctp_local_bh_disable();
|
sctp_write_lock(&asoc->base.addr_lock);
|
sctp_write_lock(&asoc->base.addr_lock);
|
retval = sctp_add_bind_addr(bp, &addr, GFP_ATOMIC);
|
retval = sctp_add_bind_addr(bp, &addr, GFP_ATOMIC);
|
sctp_write_unlock(&asoc->base.addr_lock);
|
sctp_write_unlock(&asoc->base.addr_lock);
|
sctp_local_bh_enable();
|
sctp_local_bh_enable();
|
break;
|
break;
|
case SCTP_PARAM_DEL_IP:
|
case SCTP_PARAM_DEL_IP:
|
sctp_local_bh_disable();
|
sctp_local_bh_disable();
|
sctp_write_lock(&asoc->base.addr_lock);
|
sctp_write_lock(&asoc->base.addr_lock);
|
retval = sctp_del_bind_addr(bp, &addr);
|
retval = sctp_del_bind_addr(bp, &addr);
|
sctp_write_unlock(&asoc->base.addr_lock);
|
sctp_write_unlock(&asoc->base.addr_lock);
|
sctp_local_bh_enable();
|
sctp_local_bh_enable();
|
break;
|
break;
|
default:
|
default:
|
break;
|
break;
|
}
|
}
|
|
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
|
/* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
|
* for the given asconf parameter. If there is no response for this parameter,
|
* for the given asconf parameter. If there is no response for this parameter,
|
* return the error code based on the third argument 'no_err'.
|
* return the error code based on the third argument 'no_err'.
|
* ADDIP 4.1
|
* ADDIP 4.1
|
* A7) If an error response is received for a TLV parameter, all TLVs with no
|
* A7) If an error response is received for a TLV parameter, all TLVs with no
|
* response before the failed TLV are considered successful if not reported.
|
* response before the failed TLV are considered successful if not reported.
|
* All TLVs after the failed response are considered unsuccessful unless a
|
* All TLVs after the failed response are considered unsuccessful unless a
|
* specific success indication is present for the parameter.
|
* specific success indication is present for the parameter.
|
*/
|
*/
|
static __u16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
|
static __u16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
|
sctp_addip_param_t *asconf_param,
|
sctp_addip_param_t *asconf_param,
|
int no_err)
|
int no_err)
|
{
|
{
|
sctp_addip_param_t *asconf_ack_param;
|
sctp_addip_param_t *asconf_ack_param;
|
sctp_errhdr_t *err_param;
|
sctp_errhdr_t *err_param;
|
int length;
|
int length;
|
int asconf_ack_len = asconf_ack->skb->len;
|
int asconf_ack_len = asconf_ack->skb->len;
|
__u16 err_code;
|
__u16 err_code;
|
|
|
if (no_err)
|
if (no_err)
|
err_code = SCTP_ERROR_NO_ERROR;
|
err_code = SCTP_ERROR_NO_ERROR;
|
else
|
else
|
err_code = SCTP_ERROR_REQ_REFUSED;
|
err_code = SCTP_ERROR_REQ_REFUSED;
|
|
|
/* Skip the addiphdr from the asconf_ack chunk and store a pointer to
|
/* Skip the addiphdr from the asconf_ack chunk and store a pointer to
|
* the first asconf_ack parameter.
|
* the first asconf_ack parameter.
|
*/
|
*/
|
length = sizeof(sctp_addiphdr_t);
|
length = sizeof(sctp_addiphdr_t);
|
asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
|
asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
|
length);
|
length);
|
asconf_ack_len -= length;
|
asconf_ack_len -= length;
|
|
|
while (asconf_ack_len > 0) {
|
while (asconf_ack_len > 0) {
|
if (asconf_ack_param->crr_id == asconf_param->crr_id) {
|
if (asconf_ack_param->crr_id == asconf_param->crr_id) {
|
switch(asconf_ack_param->param_hdr.type) {
|
switch(asconf_ack_param->param_hdr.type) {
|
case SCTP_PARAM_SUCCESS_REPORT:
|
case SCTP_PARAM_SUCCESS_REPORT:
|
return SCTP_ERROR_NO_ERROR;
|
return SCTP_ERROR_NO_ERROR;
|
case SCTP_PARAM_ERR_CAUSE:
|
case SCTP_PARAM_ERR_CAUSE:
|
length = sizeof(sctp_addip_param_t);
|
length = sizeof(sctp_addip_param_t);
|
err_param = (sctp_errhdr_t *)
|
err_param = (sctp_errhdr_t *)
|
((void *)asconf_ack_param + length);
|
((void *)asconf_ack_param + length);
|
asconf_ack_len -= length;
|
asconf_ack_len -= length;
|
if (asconf_ack_len > 0)
|
if (asconf_ack_len > 0)
|
return err_param->cause;
|
return err_param->cause;
|
else
|
else
|
return SCTP_ERROR_INV_PARAM;
|
return SCTP_ERROR_INV_PARAM;
|
break;
|
break;
|
default:
|
default:
|
return SCTP_ERROR_INV_PARAM;
|
return SCTP_ERROR_INV_PARAM;
|
}
|
}
|
}
|
}
|
|
|
length = ntohs(asconf_ack_param->param_hdr.length);
|
length = ntohs(asconf_ack_param->param_hdr.length);
|
asconf_ack_param = (sctp_addip_param_t *)
|
asconf_ack_param = (sctp_addip_param_t *)
|
((void *)asconf_ack_param + length);
|
((void *)asconf_ack_param + length);
|
asconf_ack_len -= length;
|
asconf_ack_len -= length;
|
}
|
}
|
|
|
return err_code;
|
return err_code;
|
}
|
}
|
|
|
/* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
|
/* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
|
int sctp_process_asconf_ack(struct sctp_association *asoc,
|
int sctp_process_asconf_ack(struct sctp_association *asoc,
|
struct sctp_chunk *asconf_ack)
|
struct sctp_chunk *asconf_ack)
|
{
|
{
|
struct sctp_chunk *asconf = asoc->addip_last_asconf;
|
struct sctp_chunk *asconf = asoc->addip_last_asconf;
|
union sctp_addr_param *addr_param;
|
union sctp_addr_param *addr_param;
|
sctp_addip_param_t *asconf_param;
|
sctp_addip_param_t *asconf_param;
|
int length = 0;
|
int length = 0;
|
int asconf_len = asconf->skb->len;
|
int asconf_len = asconf->skb->len;
|
int all_param_pass = 0;
|
int all_param_pass = 0;
|
int no_err = 1;
|
int no_err = 1;
|
int retval = 0;
|
int retval = 0;
|
__u16 err_code = SCTP_ERROR_NO_ERROR;
|
__u16 err_code = SCTP_ERROR_NO_ERROR;
|
|
|
/* Skip the chunkhdr and addiphdr from the last asconf sent and store
|
/* Skip the chunkhdr and addiphdr from the last asconf sent and store
|
* a pointer to address parameter.
|
* a pointer to address parameter.
|
*/
|
*/
|
length = sizeof(sctp_addip_chunk_t);
|
length = sizeof(sctp_addip_chunk_t);
|
addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
|
addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
|
asconf_len -= length;
|
asconf_len -= length;
|
|
|
/* Skip the address parameter in the last asconf sent and store a
|
/* Skip the address parameter in the last asconf sent and store a
|
* pointer to the first asconf paramter.
|
* pointer to the first asconf paramter.
|
*/
|
*/
|
length = ntohs(addr_param->v4.param_hdr.length);
|
length = ntohs(addr_param->v4.param_hdr.length);
|
asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
|
asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
|
asconf_len -= length;
|
asconf_len -= length;
|
|
|
/* ADDIP 4.1
|
/* ADDIP 4.1
|
* A8) If there is no response(s) to specific TLV parameter(s), and no
|
* A8) If there is no response(s) to specific TLV parameter(s), and no
|
* failures are indicated, then all request(s) are considered
|
* failures are indicated, then all request(s) are considered
|
* successful.
|
* successful.
|
*/
|
*/
|
if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
|
if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
|
all_param_pass = 1;
|
all_param_pass = 1;
|
|
|
/* Process the TLVs contained in the last sent ASCONF chunk. */
|
/* Process the TLVs contained in the last sent ASCONF chunk. */
|
while (asconf_len > 0) {
|
while (asconf_len > 0) {
|
if (all_param_pass)
|
if (all_param_pass)
|
err_code = SCTP_ERROR_NO_ERROR;
|
err_code = SCTP_ERROR_NO_ERROR;
|
else {
|
else {
|
err_code = sctp_get_asconf_response(asconf_ack,
|
err_code = sctp_get_asconf_response(asconf_ack,
|
asconf_param,
|
asconf_param,
|
no_err);
|
no_err);
|
if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
|
if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
|
no_err = 0;
|
no_err = 0;
|
}
|
}
|
|
|
switch (err_code) {
|
switch (err_code) {
|
case SCTP_ERROR_NO_ERROR:
|
case SCTP_ERROR_NO_ERROR:
|
retval = sctp_asconf_param_success(asoc, asconf_param);
|
retval = sctp_asconf_param_success(asoc, asconf_param);
|
break;
|
break;
|
|
|
case SCTP_ERROR_RSRC_LOW:
|
case SCTP_ERROR_RSRC_LOW:
|
retval = 1;
|
retval = 1;
|
break;
|
break;
|
|
|
case SCTP_ERROR_INV_PARAM:
|
case SCTP_ERROR_INV_PARAM:
|
/* Disable sending this type of asconf parameter in
|
/* Disable sending this type of asconf parameter in
|
* future.
|
* future.
|
*/
|
*/
|
asoc->peer.addip_disabled_mask |=
|
asoc->peer.addip_disabled_mask |=
|
asconf_param->param_hdr.type;
|
asconf_param->param_hdr.type;
|
break;
|
break;
|
|
|
case SCTP_ERROR_REQ_REFUSED:
|
case SCTP_ERROR_REQ_REFUSED:
|
case SCTP_ERROR_DEL_LAST_IP:
|
case SCTP_ERROR_DEL_LAST_IP:
|
case SCTP_ERROR_DEL_SRC_IP:
|
case SCTP_ERROR_DEL_SRC_IP:
|
default:
|
default:
|
break;
|
break;
|
}
|
}
|
|
|
/* Skip the processed asconf parameter and move to the next
|
/* Skip the processed asconf parameter and move to the next
|
* one.
|
* one.
|
*/
|
*/
|
length = ntohs(asconf_param->param_hdr.length);
|
length = ntohs(asconf_param->param_hdr.length);
|
asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
|
asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
|
length);
|
length);
|
asconf_len -= length;
|
asconf_len -= length;
|
}
|
}
|
|
|
/* Free the cached last sent asconf chunk. */
|
/* Free the cached last sent asconf chunk. */
|
sctp_chunk_free(asconf);
|
sctp_chunk_free(asconf);
|
asoc->addip_last_asconf = NULL;
|
asoc->addip_last_asconf = NULL;
|
|
|
/* Send the next asconf chunk from the addip chunk queue. */
|
/* Send the next asconf chunk from the addip chunk queue. */
|
asconf = (struct sctp_chunk *)__skb_dequeue(&asoc->addip_chunks);
|
asconf = (struct sctp_chunk *)__skb_dequeue(&asoc->addip_chunks);
|
if (asconf) {
|
if (asconf) {
|
/* Hold the chunk until an ASCONF_ACK is received. */
|
/* Hold the chunk until an ASCONF_ACK is received. */
|
sctp_chunk_hold(asconf);
|
sctp_chunk_hold(asconf);
|
if (sctp_primitive_ASCONF(asoc, asconf))
|
if (sctp_primitive_ASCONF(asoc, asconf))
|
sctp_chunk_free(asconf);
|
sctp_chunk_free(asconf);
|
else
|
else
|
asoc->addip_last_asconf = asconf;
|
asoc->addip_last_asconf = asconf;
|
}
|
}
|
|
|
return retval;
|
return retval;
|
}
|
}
|
|
|
