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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <sys/stream.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <netinet/in.h>
#include <netinet/ip6.h>
#include <inet/common.h>
#include <inet/ipclassifier.h>
#include <inet/ip.h>
#include <inet/ip6.h>
#include <inet/mib2.h>
#include <inet/nd.h>
#include <inet/optcom.h>
#include <inet/ipclassifier.h>
#include "sctp_impl.h"
#include "sctp_addr.h"
/*
* This will compute the checksum over the SCTP packet, so this
* function should only be called after the whole packet has been
* built.
*
* rptr should point to the IP / SCTP composite header.
* len should be the length of the entire packet, including the IP
* header.
*/
void
sctp_add_hdr(sctp_t *sctp, uchar_t *rptr, size_t len)
{
ipha_t *iphdr;
short iplen;
ASSERT(len >= sctp->sctp_hdr_len);
/* Copy the common header from the template */
bcopy(sctp->sctp_iphc, rptr, sctp->sctp_hdr_len);
/* Set the total length in the IP hdr */
iplen = (short)len;
iphdr = (ipha_t *)rptr;
U16_TO_ABE16(iplen, &iphdr->ipha_length);
}
/*ARGSUSED*/
size_t
sctp_supaddr_param_len(sctp_t *sctp)
{
return (sizeof (sctp_parm_hdr_t) + sizeof (int32_t));
}
size_t
sctp_supaddr_param(sctp_t *sctp, uchar_t *p)
{
sctp_parm_hdr_t *sph;
uint16_t *addrtype;
sph = (sctp_parm_hdr_t *)p;
sph->sph_type = htons(PARM_SUPP_ADDRS);
addrtype = (uint16_t *)(sph + 1);
switch (sctp->sctp_ipversion) {
case IPV4_VERSION:
*addrtype++ = htons(PARM_ADDR4);
*addrtype = 0;
sph->sph_len = htons(sizeof (*sph) + sizeof (*addrtype));
break;
case IPV6_VERSION:
*addrtype++ = htons(PARM_ADDR6);
if (!sctp->sctp_connp->conn_ipv6_v6only) {
*addrtype = htons(PARM_ADDR4);
sph->sph_len = htons(sizeof (*sph) +
sizeof (*addrtype) * 2);
} else {
*addrtype = 0;
sph->sph_len = htons(sizeof (*sph) +
sizeof (*addrtype));
}
break;
default:
break;
}
return (sizeof (*sph) + (sizeof (*addrtype) * 2));
}
/*
* Currently, we support on PRSCTP option, there is more to come.
*/
/*ARGSUSED*/
size_t
sctp_options_param_len(const sctp_t *sctp, int option)
{
size_t optlen;
switch (option) {
case SCTP_PRSCTP_OPTION:
optlen = sizeof (sctp_parm_hdr_t);
break;
default:
ASSERT(0);
}
return (optlen);
}
/*ARGSUSED*/
size_t
sctp_options_param(const sctp_t *sctp, void *p, int option)
{
sctp_parm_hdr_t *sph = (sctp_parm_hdr_t *)p;
switch (option) {
case SCTP_PRSCTP_OPTION:
sph->sph_type = htons(PARM_FORWARD_TSN);
sph->sph_len = htons(sizeof (*sph));
break;
default:
ASSERT(0);
}
return (sizeof (*sph));
}
size_t
sctp_adaptation_code_param(sctp_t *sctp, uchar_t *p)
{
sctp_parm_hdr_t *sph;
if (!sctp->sctp_send_adaptation) {
return (0);
}
sph = (sctp_parm_hdr_t *)p;
sph->sph_type = htons(PARM_ADAPT_LAYER_IND);
sph->sph_len = htons(sizeof (*sph) + sizeof (uint32_t));
*(uint32_t *)(sph + 1) = htonl(sctp->sctp_tx_adaptation_code);
return (sizeof (*sph) + sizeof (uint32_t));
}
mblk_t *
sctp_init_mp(sctp_t *sctp)
{
mblk_t *mp;
uchar_t *p;
size_t initlen;
sctp_init_chunk_t *icp;
sctp_chunk_hdr_t *chp;
uint16_t schlen;
int supp_af;
sctp_stack_t *sctps = sctp->sctp_sctps;
if (sctp->sctp_family == AF_INET) {
supp_af = PARM_SUPP_V4;
} else {
/* Assume here that a v6 endpoint supports v4 address. */
if (sctp->sctp_connp->conn_ipv6_v6only)
supp_af = PARM_SUPP_V6;
else
supp_af = PARM_SUPP_V6 | PARM_SUPP_V4;
}
initlen = sizeof (*chp) + sizeof (*icp);
if (sctp->sctp_send_adaptation) {
initlen += (sizeof (sctp_parm_hdr_t) + sizeof (uint32_t));
}
initlen += sctp_supaddr_param_len(sctp);
initlen += sctp_addr_params(sctp, supp_af, NULL, B_TRUE);
if (sctp->sctp_prsctp_aware && sctps->sctps_prsctp_enabled)
initlen += sctp_options_param_len(sctp, SCTP_PRSCTP_OPTION);
/*
* This could be a INIT retransmission in which case sh_verf may
* be non-zero, zero it out just to be sure.
*/
sctp->sctp_sctph->sh_verf = 0;
sctp->sctp_sctph6->sh_verf = 0;
mp = sctp_make_mp(sctp, NULL, initlen);
if (mp == NULL) {
SCTP_KSTAT(sctps, sctp_send_init_failed);
return (NULL);
}
/* Lay in a new INIT chunk, starting with the chunk header */
chp = (sctp_chunk_hdr_t *)mp->b_wptr;
chp->sch_id = CHUNK_INIT;
chp->sch_flags = 0;
schlen = (uint16_t)initlen;
U16_TO_ABE16(schlen, &(chp->sch_len));
mp->b_wptr += initlen;
icp = (sctp_init_chunk_t *)(chp + 1);
icp->sic_inittag = sctp->sctp_lvtag;
U32_TO_ABE32(sctp->sctp_rwnd, &(icp->sic_a_rwnd));
U16_TO_ABE16(sctp->sctp_num_ostr, &(icp->sic_outstr));
U16_TO_ABE16(sctp->sctp_num_istr, &(icp->sic_instr));
U32_TO_ABE32(sctp->sctp_ltsn, &(icp->sic_inittsn));
p = (uchar_t *)(icp + 1);
/* Adaptation layer param */
p += sctp_adaptation_code_param(sctp, p);
/* Add supported address types parameter */
p += sctp_supaddr_param(sctp, p);
/* Add address parameters */
p += sctp_addr_params(sctp, supp_af, p, B_FALSE);
/* Add Forward-TSN-Supported param */
if (sctp->sctp_prsctp_aware && sctps->sctps_prsctp_enabled)
p += sctp_options_param(sctp, p, SCTP_PRSCTP_OPTION);
BUMP_LOCAL(sctp->sctp_obchunks);
sctp_set_iplen(sctp, mp);
return (mp);
}
/*
* Extracts the verification tag from an INIT chunk. If the INIT
* chunk is truncated or malformed, returns 0.
*/
uint32_t
sctp_init2vtag(sctp_chunk_hdr_t *initch)
{
sctp_init_chunk_t *init;
init = (sctp_init_chunk_t *)(initch + 1);
return (init->sic_inittag);
}
size_t
sctp_addr_params(sctp_t *sctp, int af, uchar_t *p, boolean_t modify)
{
size_t param_len;
ASSERT(sctp->sctp_nsaddrs > 0);
/*
* If we have only one local address or it is a loopback or linklocal
* association, we let the peer pull the address from the IP header.
*/
if ((!modify && sctp->sctp_nsaddrs == 1) || sctp->sctp_loopback ||
sctp->sctp_linklocal) {
return (0);
}
param_len = sctp_saddr_info(sctp, af, p, modify);
return ((sctp->sctp_nsaddrs == 1) ? 0 : param_len);
}
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