/* SCTP kernel reference Implementation
|
/* SCTP kernel reference Implementation
|
* 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) 2001-2003 International Business Machines, Corp.
|
* Copyright (c) 2001-2003 International Business Machines, Corp.
|
* Copyright (c) 2001 Intel Corp.
|
* Copyright (c) 2001 Intel Corp.
|
* Copyright (c) 2001 Nokia, Inc.
|
* Copyright (c) 2001 Nokia, Inc.
|
* Copyright (c) 2001 La Monte H.P. Yarroll
|
* Copyright (c) 2001 La Monte H.P. Yarroll
|
*
|
*
|
* This file is part of the SCTP kernel reference Implementation
|
* This file is part of the SCTP kernel reference Implementation
|
*
|
*
|
* These functions handle all input from the IP layer into SCTP.
|
* These functions handle all input from the IP layer into SCTP.
|
*
|
*
|
* 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>
|
* Xingang Guo <xingang.guo@intel.com>
|
* Xingang Guo <xingang.guo@intel.com>
|
* Jon Grimm <jgrimm@us.ibm.com>
|
* Jon Grimm <jgrimm@us.ibm.com>
|
* Hui Huang <hui.huang@nokia.com>
|
* Hui Huang <hui.huang@nokia.com>
|
* Daisy Chang <daisyc@us.ibm.com>
|
* Daisy Chang <daisyc@us.ibm.com>
|
* Sridhar Samudrala <sri@us.ibm.com>
|
* Sridhar Samudrala <sri@us.ibm.com>
|
* Ardelle Fan <ardelle.fan@intel.com>
|
* Ardelle Fan <ardelle.fan@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/list.h> /* For struct list_head */
|
#include <linux/list.h> /* For struct list_head */
|
#include <linux/socket.h>
|
#include <linux/socket.h>
|
#include <linux/ip.h>
|
#include <linux/ip.h>
|
#include <linux/time.h> /* For struct timeval */
|
#include <linux/time.h> /* For struct timeval */
|
#include <net/ip.h>
|
#include <net/ip.h>
|
#include <net/icmp.h>
|
#include <net/icmp.h>
|
#include <net/snmp.h>
|
#include <net/snmp.h>
|
#include <net/sock.h>
|
#include <net/sock.h>
|
#include <linux/ipsec.h>
|
#include <linux/ipsec.h>
|
#include <net/sctp/sctp.h>
|
#include <net/sctp/sctp.h>
|
#include <net/sctp/sm.h>
|
#include <net/sctp/sm.h>
|
|
|
/* Forward declarations for internal helpers. */
|
/* Forward declarations for internal helpers. */
|
static int sctp_rcv_ootb(struct sk_buff *);
|
static int sctp_rcv_ootb(struct sk_buff *);
|
struct sctp_association *__sctp_rcv_lookup(struct sk_buff *skb,
|
struct sctp_association *__sctp_rcv_lookup(struct sk_buff *skb,
|
const union sctp_addr *laddr,
|
const union sctp_addr *laddr,
|
const union sctp_addr *paddr,
|
const union sctp_addr *paddr,
|
struct sctp_transport **transportp);
|
struct sctp_transport **transportp);
|
struct sctp_endpoint *__sctp_rcv_lookup_endpoint(const union sctp_addr *laddr);
|
struct sctp_endpoint *__sctp_rcv_lookup_endpoint(const union sctp_addr *laddr);
|
|
|
|
|
/* Calculate the SCTP checksum of an SCTP packet. */
|
/* Calculate the SCTP checksum of an SCTP packet. */
|
static inline int sctp_rcv_checksum(struct sk_buff *skb)
|
static inline int sctp_rcv_checksum(struct sk_buff *skb)
|
{
|
{
|
struct sctphdr *sh;
|
struct sctphdr *sh;
|
__u32 cmp, val;
|
__u32 cmp, val;
|
struct sk_buff *list = skb_shinfo(skb)->frag_list;
|
struct sk_buff *list = skb_shinfo(skb)->frag_list;
|
|
|
sh = (struct sctphdr *) skb->h.raw;
|
sh = (struct sctphdr *) skb->h.raw;
|
cmp = ntohl(sh->checksum);
|
cmp = ntohl(sh->checksum);
|
|
|
val = sctp_start_cksum((__u8 *)sh, skb_headlen(skb));
|
val = sctp_start_cksum((__u8 *)sh, skb_headlen(skb));
|
|
|
for (; list; list = list->next)
|
for (; list; list = list->next)
|
val = sctp_update_cksum((__u8 *)list->data, skb_headlen(list),
|
val = sctp_update_cksum((__u8 *)list->data, skb_headlen(list),
|
val);
|
val);
|
|
|
val = sctp_end_cksum(val);
|
val = sctp_end_cksum(val);
|
|
|
if (val != cmp) {
|
if (val != cmp) {
|
/* CRC failure, dump it. */
|
/* CRC failure, dump it. */
|
SCTP_INC_STATS_BH(SctpChecksumErrors);
|
SCTP_INC_STATS_BH(SctpChecksumErrors);
|
return -1;
|
return -1;
|
}
|
}
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/*
|
/*
|
* This is the routine which IP calls when receiving an SCTP packet.
|
* This is the routine which IP calls when receiving an SCTP packet.
|
*/
|
*/
|
int sctp_rcv(struct sk_buff *skb)
|
int sctp_rcv(struct sk_buff *skb)
|
{
|
{
|
struct sock *sk;
|
struct sock *sk;
|
struct sctp_association *asoc;
|
struct sctp_association *asoc;
|
struct sctp_endpoint *ep = NULL;
|
struct sctp_endpoint *ep = NULL;
|
struct sctp_ep_common *rcvr;
|
struct sctp_ep_common *rcvr;
|
struct sctp_transport *transport = NULL;
|
struct sctp_transport *transport = NULL;
|
struct sctp_chunk *chunk;
|
struct sctp_chunk *chunk;
|
struct sctphdr *sh;
|
struct sctphdr *sh;
|
union sctp_addr src;
|
union sctp_addr src;
|
union sctp_addr dest;
|
union sctp_addr dest;
|
int family;
|
int family;
|
struct sctp_af *af;
|
struct sctp_af *af;
|
int ret = 0;
|
int ret = 0;
|
|
|
if (skb->pkt_type!=PACKET_HOST)
|
if (skb->pkt_type!=PACKET_HOST)
|
goto discard_it;
|
goto discard_it;
|
|
|
SCTP_INC_STATS_BH(SctpInSCTPPacks);
|
SCTP_INC_STATS_BH(SctpInSCTPPacks);
|
|
|
sh = (struct sctphdr *) skb->h.raw;
|
sh = (struct sctphdr *) skb->h.raw;
|
|
|
/* Pull up the IP and SCTP headers. */
|
/* Pull up the IP and SCTP headers. */
|
__skb_pull(skb, skb->h.raw - skb->data);
|
__skb_pull(skb, skb->h.raw - skb->data);
|
if (skb->len < sizeof(struct sctphdr))
|
if (skb->len < sizeof(struct sctphdr))
|
goto discard_it;
|
goto discard_it;
|
if (sctp_rcv_checksum(skb) < 0)
|
if (sctp_rcv_checksum(skb) < 0)
|
goto discard_it;
|
goto discard_it;
|
|
|
skb_pull(skb, sizeof(struct sctphdr));
|
skb_pull(skb, sizeof(struct sctphdr));
|
|
|
family = ipver2af(skb->nh.iph->version);
|
family = ipver2af(skb->nh.iph->version);
|
af = sctp_get_af_specific(family);
|
af = sctp_get_af_specific(family);
|
if (unlikely(!af))
|
if (unlikely(!af))
|
goto discard_it;
|
goto discard_it;
|
|
|
/* Initialize local addresses for lookups. */
|
/* Initialize local addresses for lookups. */
|
af->from_skb(&src, skb, 1);
|
af->from_skb(&src, skb, 1);
|
af->from_skb(&dest, skb, 0);
|
af->from_skb(&dest, skb, 0);
|
|
|
/* If the packet is to or from a non-unicast address,
|
/* If the packet is to or from a non-unicast address,
|
* silently discard the packet.
|
* silently discard the packet.
|
*
|
*
|
* This is not clearly defined in the RFC except in section
|
* This is not clearly defined in the RFC except in section
|
* 8.4 - OOTB handling. However, based on the book "Stream Control
|
* 8.4 - OOTB handling. However, based on the book "Stream Control
|
* Transmission Protocol" 2.1, "It is important to note that the
|
* Transmission Protocol" 2.1, "It is important to note that the
|
* IP address of an SCTP transport address must be a routable
|
* IP address of an SCTP transport address must be a routable
|
* unicast address. In other words, IP multicast addresses and
|
* unicast address. In other words, IP multicast addresses and
|
* IP broadcast addresses cannot be used in an SCTP transport
|
* IP broadcast addresses cannot be used in an SCTP transport
|
* address."
|
* address."
|
*/
|
*/
|
if (!af->addr_valid(&src, NULL) || !af->addr_valid(&dest, NULL))
|
if (!af->addr_valid(&src, NULL) || !af->addr_valid(&dest, NULL))
|
goto discard_it;
|
goto discard_it;
|
|
|
asoc = __sctp_rcv_lookup(skb, &src, &dest, &transport);
|
asoc = __sctp_rcv_lookup(skb, &src, &dest, &transport);
|
|
|
/*
|
/*
|
* RFC 2960, 8.4 - Handle "Out of the blue" Packets.
|
* RFC 2960, 8.4 - Handle "Out of the blue" Packets.
|
* An SCTP packet is called an "out of the blue" (OOTB)
|
* An SCTP packet is called an "out of the blue" (OOTB)
|
* packet if it is correctly formed, i.e., passed the
|
* packet if it is correctly formed, i.e., passed the
|
* receiver's checksum check, but the receiver is not
|
* receiver's checksum check, but the receiver is not
|
* able to identify the association to which this
|
* able to identify the association to which this
|
* packet belongs.
|
* packet belongs.
|
*/
|
*/
|
if (!asoc) {
|
if (!asoc) {
|
ep = __sctp_rcv_lookup_endpoint(&dest);
|
ep = __sctp_rcv_lookup_endpoint(&dest);
|
if (sctp_rcv_ootb(skb)) {
|
if (sctp_rcv_ootb(skb)) {
|
SCTP_INC_STATS_BH(SctpOutOfBlues);
|
SCTP_INC_STATS_BH(SctpOutOfBlues);
|
goto discard_release;
|
goto discard_release;
|
}
|
}
|
}
|
}
|
|
|
/* Retrieve the common input handling substructure. */
|
/* Retrieve the common input handling substructure. */
|
rcvr = asoc ? &asoc->base : &ep->base;
|
rcvr = asoc ? &asoc->base : &ep->base;
|
sk = rcvr->sk;
|
sk = rcvr->sk;
|
|
|
if (!ipsec_sk_policy(sk, skb))
|
if (!ipsec_sk_policy(sk, skb))
|
goto discard_release;
|
goto discard_release;
|
|
|
ret = sk_filter(sk, skb, 1);
|
ret = sk_filter(sk, skb, 1);
|
if (ret)
|
if (ret)
|
goto discard_release;
|
goto discard_release;
|
|
|
/* Create an SCTP packet structure. */
|
/* Create an SCTP packet structure. */
|
chunk = sctp_chunkify(skb, asoc, sk);
|
chunk = sctp_chunkify(skb, asoc, sk);
|
if (!chunk) {
|
if (!chunk) {
|
ret = -ENOMEM;
|
ret = -ENOMEM;
|
goto discard_release;
|
goto discard_release;
|
}
|
}
|
|
|
/* Remember what endpoint is to handle this packet. */
|
/* Remember what endpoint is to handle this packet. */
|
chunk->rcvr = rcvr;
|
chunk->rcvr = rcvr;
|
|
|
/* Remember the SCTP header. */
|
/* Remember the SCTP header. */
|
chunk->sctp_hdr = sh;
|
chunk->sctp_hdr = sh;
|
|
|
/* Set the source and destination addresses of the incoming chunk. */
|
/* Set the source and destination addresses of the incoming chunk. */
|
sctp_init_addrs(chunk, &src, &dest);
|
sctp_init_addrs(chunk, &src, &dest);
|
|
|
/* Remember where we came from. */
|
/* Remember where we came from. */
|
chunk->transport = transport;
|
chunk->transport = transport;
|
|
|
/* Acquire access to the sock lock. Note: We are safe from other
|
/* Acquire access to the sock lock. Note: We are safe from other
|
* bottom halves on this lock, but a user may be in the lock too,
|
* bottom halves on this lock, but a user may be in the lock too,
|
* so check if it is busy.
|
* so check if it is busy.
|
*/
|
*/
|
sctp_bh_lock_sock(sk);
|
sctp_bh_lock_sock(sk);
|
|
|
if (sock_owned_by_user(sk))
|
if (sock_owned_by_user(sk))
|
sk_add_backlog(sk, (struct sk_buff *) chunk);
|
sk_add_backlog(sk, (struct sk_buff *) chunk);
|
else
|
else
|
sctp_backlog_rcv(sk, (struct sk_buff *) chunk);
|
sctp_backlog_rcv(sk, (struct sk_buff *) chunk);
|
|
|
/* Release the sock and any reference counts we took in the
|
/* Release the sock and any reference counts we took in the
|
* lookup calls.
|
* lookup calls.
|
*/
|
*/
|
sctp_bh_unlock_sock(sk);
|
sctp_bh_unlock_sock(sk);
|
if (asoc)
|
if (asoc)
|
sctp_association_put(asoc);
|
sctp_association_put(asoc);
|
else
|
else
|
sctp_endpoint_put(ep);
|
sctp_endpoint_put(ep);
|
sock_put(sk);
|
sock_put(sk);
|
return ret;
|
return ret;
|
|
|
discard_it:
|
discard_it:
|
kfree_skb(skb);
|
kfree_skb(skb);
|
return ret;
|
return ret;
|
|
|
discard_release:
|
discard_release:
|
/* Release any structures we may be holding. */
|
/* Release any structures we may be holding. */
|
if (asoc) {
|
if (asoc) {
|
sock_put(asoc->base.sk);
|
sock_put(asoc->base.sk);
|
sctp_association_put(asoc);
|
sctp_association_put(asoc);
|
} else {
|
} else {
|
sock_put(ep->base.sk);
|
sock_put(ep->base.sk);
|
sctp_endpoint_put(ep);
|
sctp_endpoint_put(ep);
|
}
|
}
|
|
|
goto discard_it;
|
goto discard_it;
|
}
|
}
|
|
|
/* Handle second half of inbound skb processing. If the sock was busy,
|
/* Handle second half of inbound skb processing. If the sock was busy,
|
* we may have need to delay processing until later when the sock is
|
* we may have need to delay processing until later when the sock is
|
* released (on the backlog). If not busy, we call this routine
|
* released (on the backlog). If not busy, we call this routine
|
* directly from the bottom half.
|
* directly from the bottom half.
|
*/
|
*/
|
int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb)
|
int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb)
|
{
|
{
|
struct sctp_chunk *chunk;
|
struct sctp_chunk *chunk;
|
struct sctp_inq *inqueue;
|
struct sctp_inq *inqueue;
|
|
|
/* One day chunk will live inside the skb, but for
|
/* One day chunk will live inside the skb, but for
|
* now this works.
|
* now this works.
|
*/
|
*/
|
chunk = (struct sctp_chunk *) skb;
|
chunk = (struct sctp_chunk *) skb;
|
inqueue = &chunk->rcvr->inqueue;
|
inqueue = &chunk->rcvr->inqueue;
|
|
|
sctp_inq_push(inqueue, chunk);
|
sctp_inq_push(inqueue, chunk);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Handle icmp frag needed error. */
|
/* Handle icmp frag needed error. */
|
void sctp_icmp_frag_needed(struct sock *sk, struct sctp_association *asoc,
|
void sctp_icmp_frag_needed(struct sock *sk, struct sctp_association *asoc,
|
struct sctp_transport *t, __u32 pmtu)
|
struct sctp_transport *t, __u32 pmtu)
|
{
|
{
|
if (unlikely(pmtu < SCTP_DEFAULT_MINSEGMENT)) {
|
if (unlikely(pmtu < SCTP_DEFAULT_MINSEGMENT)) {
|
printk(KERN_WARNING "%s: Reported pmtu %d too low, "
|
printk(KERN_WARNING "%s: Reported pmtu %d too low, "
|
"using default minimum of %d\n", __FUNCTION__, pmtu,
|
"using default minimum of %d\n", __FUNCTION__, pmtu,
|
SCTP_DEFAULT_MINSEGMENT);
|
SCTP_DEFAULT_MINSEGMENT);
|
pmtu = SCTP_DEFAULT_MINSEGMENT;
|
pmtu = SCTP_DEFAULT_MINSEGMENT;
|
}
|
}
|
|
|
if (!sock_owned_by_user(sk) && t && (t->pmtu != pmtu)) {
|
if (!sock_owned_by_user(sk) && t && (t->pmtu != pmtu)) {
|
t->pmtu = pmtu;
|
t->pmtu = pmtu;
|
sctp_assoc_sync_pmtu(asoc);
|
sctp_assoc_sync_pmtu(asoc);
|
sctp_retransmit(&asoc->outqueue, t, SCTP_RTXR_PMTUD);
|
sctp_retransmit(&asoc->outqueue, t, SCTP_RTXR_PMTUD);
|
}
|
}
|
}
|
}
|
|
|
/* Common lookup code for icmp/icmpv6 error handler. */
|
/* Common lookup code for icmp/icmpv6 error handler. */
|
struct sock *sctp_err_lookup(int family, struct sk_buff *skb,
|
struct sock *sctp_err_lookup(int family, struct sk_buff *skb,
|
struct sctphdr *sctphdr,
|
struct sctphdr *sctphdr,
|
struct sctp_endpoint **epp,
|
struct sctp_endpoint **epp,
|
struct sctp_association **app,
|
struct sctp_association **app,
|
struct sctp_transport **tpp)
|
struct sctp_transport **tpp)
|
{
|
{
|
union sctp_addr saddr;
|
union sctp_addr saddr;
|
union sctp_addr daddr;
|
union sctp_addr daddr;
|
struct sctp_af *af;
|
struct sctp_af *af;
|
struct sock *sk = NULL;
|
struct sock *sk = NULL;
|
struct sctp_endpoint *ep = NULL;
|
struct sctp_endpoint *ep = NULL;
|
struct sctp_association *asoc = NULL;
|
struct sctp_association *asoc = NULL;
|
struct sctp_transport *transport = NULL;
|
struct sctp_transport *transport = NULL;
|
|
|
*app = NULL; *epp = NULL; *tpp = NULL;
|
*app = NULL; *epp = NULL; *tpp = NULL;
|
|
|
af = sctp_get_af_specific(family);
|
af = sctp_get_af_specific(family);
|
if (unlikely(!af)) {
|
if (unlikely(!af)) {
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
/* Initialize local addresses for lookups. */
|
/* Initialize local addresses for lookups. */
|
af->from_skb(&saddr, skb, 1);
|
af->from_skb(&saddr, skb, 1);
|
af->from_skb(&daddr, skb, 0);
|
af->from_skb(&daddr, skb, 0);
|
|
|
/* Look for an association that matches the incoming ICMP error
|
/* Look for an association that matches the incoming ICMP error
|
* packet.
|
* packet.
|
*/
|
*/
|
asoc = __sctp_lookup_association(&saddr, &daddr, &transport);
|
asoc = __sctp_lookup_association(&saddr, &daddr, &transport);
|
if (!asoc) {
|
if (!asoc) {
|
/* If there is no matching association, see if it matches any
|
/* If there is no matching association, see if it matches any
|
* endpoint. This may happen for an ICMP error generated in
|
* endpoint. This may happen for an ICMP error generated in
|
* response to an INIT_ACK.
|
* response to an INIT_ACK.
|
*/
|
*/
|
ep = __sctp_rcv_lookup_endpoint(&daddr);
|
ep = __sctp_rcv_lookup_endpoint(&daddr);
|
if (!ep) {
|
if (!ep) {
|
return NULL;
|
return NULL;
|
}
|
}
|
}
|
}
|
|
|
if (asoc) {
|
if (asoc) {
|
if (ntohl(sctphdr->vtag) != asoc->c.peer_vtag) {
|
if (ntohl(sctphdr->vtag) != asoc->c.peer_vtag) {
|
ICMP_INC_STATS_BH(IcmpInErrors);
|
ICMP_INC_STATS_BH(IcmpInErrors);
|
goto out;
|
goto out;
|
}
|
}
|
sk = asoc->base.sk;
|
sk = asoc->base.sk;
|
} else
|
} else
|
sk = ep->base.sk;
|
sk = ep->base.sk;
|
|
|
sctp_bh_lock_sock(sk);
|
sctp_bh_lock_sock(sk);
|
|
|
/* If too many ICMPs get dropped on busy
|
/* If too many ICMPs get dropped on busy
|
* servers this needs to be solved differently.
|
* servers this needs to be solved differently.
|
*/
|
*/
|
if (sock_owned_by_user(sk))
|
if (sock_owned_by_user(sk))
|
NET_INC_STATS_BH(LockDroppedIcmps);
|
NET_INC_STATS_BH(LockDroppedIcmps);
|
|
|
*epp = ep;
|
*epp = ep;
|
*app = asoc;
|
*app = asoc;
|
*tpp = transport;
|
*tpp = transport;
|
return sk;
|
return sk;
|
|
|
out:
|
out:
|
sock_put(sk);
|
sock_put(sk);
|
if (asoc)
|
if (asoc)
|
sctp_association_put(asoc);
|
sctp_association_put(asoc);
|
if (ep)
|
if (ep)
|
sctp_endpoint_put(ep);
|
sctp_endpoint_put(ep);
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
/* Common cleanup code for icmp/icmpv6 error handler. */
|
/* Common cleanup code for icmp/icmpv6 error handler. */
|
void sctp_err_finish(struct sock *sk, struct sctp_endpoint *ep,
|
void sctp_err_finish(struct sock *sk, struct sctp_endpoint *ep,
|
struct sctp_association *asoc)
|
struct sctp_association *asoc)
|
{
|
{
|
sctp_bh_unlock_sock(sk);
|
sctp_bh_unlock_sock(sk);
|
sock_put(sk);
|
sock_put(sk);
|
if (asoc)
|
if (asoc)
|
sctp_association_put(asoc);
|
sctp_association_put(asoc);
|
if (ep)
|
if (ep)
|
sctp_endpoint_put(ep);
|
sctp_endpoint_put(ep);
|
}
|
}
|
|
|
/*
|
/*
|
* This routine is called by the ICMP module when it gets some
|
* This routine is called by the ICMP module when it gets some
|
* sort of error condition. If err < 0 then the socket should
|
* sort of error condition. If err < 0 then the socket should
|
* be closed and the error returned to the user. If err > 0
|
* be closed and the error returned to the user. If err > 0
|
* it's just the icmp type << 8 | icmp code. After adjustment
|
* it's just the icmp type << 8 | icmp code. After adjustment
|
* header points to the first 8 bytes of the sctp header. We need
|
* header points to the first 8 bytes of the sctp header. We need
|
* to find the appropriate port.
|
* to find the appropriate port.
|
*
|
*
|
* The locking strategy used here is very "optimistic". When
|
* The locking strategy used here is very "optimistic". When
|
* someone else accesses the socket the ICMP is just dropped
|
* someone else accesses the socket the ICMP is just dropped
|
* and for some paths there is no check at all.
|
* and for some paths there is no check at all.
|
* A more general error queue to queue errors for later handling
|
* A more general error queue to queue errors for later handling
|
* is probably better.
|
* is probably better.
|
*
|
*
|
*/
|
*/
|
void sctp_v4_err(struct sk_buff *skb, __u32 info)
|
void sctp_v4_err(struct sk_buff *skb, __u32 info)
|
{
|
{
|
struct iphdr *iph = (struct iphdr *)skb->data;
|
struct iphdr *iph = (struct iphdr *)skb->data;
|
struct sctphdr *sh = (struct sctphdr *)(skb->data + (iph->ihl <<2));
|
struct sctphdr *sh = (struct sctphdr *)(skb->data + (iph->ihl <<2));
|
int type = skb->h.icmph->type;
|
int type = skb->h.icmph->type;
|
int code = skb->h.icmph->code;
|
int code = skb->h.icmph->code;
|
struct sock *sk;
|
struct sock *sk;
|
struct sctp_endpoint *ep;
|
struct sctp_endpoint *ep;
|
struct sctp_association *asoc;
|
struct sctp_association *asoc;
|
struct sctp_transport *transport;
|
struct sctp_transport *transport;
|
struct inet_opt *inet;
|
struct inet_opt *inet;
|
char *saveip, *savesctp;
|
char *saveip, *savesctp;
|
int err;
|
int err;
|
|
|
if (skb->len < ((iph->ihl << 2) + 8)) {
|
if (skb->len < ((iph->ihl << 2) + 8)) {
|
ICMP_INC_STATS_BH(IcmpInErrors);
|
ICMP_INC_STATS_BH(IcmpInErrors);
|
return;
|
return;
|
}
|
}
|
|
|
/* Fix up skb to look at the embedded net header. */
|
/* Fix up skb to look at the embedded net header. */
|
saveip = skb->nh.raw;
|
saveip = skb->nh.raw;
|
savesctp = skb->h.raw;
|
savesctp = skb->h.raw;
|
skb->nh.iph = iph;
|
skb->nh.iph = iph;
|
skb->h.raw = (char *)sh;
|
skb->h.raw = (char *)sh;
|
sk = sctp_err_lookup(AF_INET, skb, sh, &ep, &asoc, &transport);
|
sk = sctp_err_lookup(AF_INET, skb, sh, &ep, &asoc, &transport);
|
/* Put back, the original pointers. */
|
/* Put back, the original pointers. */
|
skb->nh.raw = saveip;
|
skb->nh.raw = saveip;
|
skb->h.raw = savesctp;
|
skb->h.raw = savesctp;
|
if (!sk) {
|
if (!sk) {
|
ICMP_INC_STATS_BH(IcmpInErrors);
|
ICMP_INC_STATS_BH(IcmpInErrors);
|
return;
|
return;
|
}
|
}
|
/* Warning: The sock lock is held. Remember to call
|
/* Warning: The sock lock is held. Remember to call
|
* sctp_err_finish!
|
* sctp_err_finish!
|
*/
|
*/
|
|
|
switch (type) {
|
switch (type) {
|
case ICMP_PARAMETERPROB:
|
case ICMP_PARAMETERPROB:
|
err = EPROTO;
|
err = EPROTO;
|
break;
|
break;
|
case ICMP_DEST_UNREACH:
|
case ICMP_DEST_UNREACH:
|
if (code > NR_ICMP_UNREACH)
|
if (code > NR_ICMP_UNREACH)
|
goto out_unlock;
|
goto out_unlock;
|
|
|
/* PMTU discovery (RFC1191) */
|
/* PMTU discovery (RFC1191) */
|
if (ICMP_FRAG_NEEDED == code) {
|
if (ICMP_FRAG_NEEDED == code) {
|
sctp_icmp_frag_needed(sk, asoc, transport, info);
|
sctp_icmp_frag_needed(sk, asoc, transport, info);
|
goto out_unlock;
|
goto out_unlock;
|
}
|
}
|
|
|
err = icmp_err_convert[code].errno;
|
err = icmp_err_convert[code].errno;
|
break;
|
break;
|
case ICMP_TIME_EXCEEDED:
|
case ICMP_TIME_EXCEEDED:
|
/* Ignore any time exceeded errors due to fragment reassembly
|
/* Ignore any time exceeded errors due to fragment reassembly
|
* timeouts.
|
* timeouts.
|
*/
|
*/
|
if (ICMP_EXC_FRAGTIME == code)
|
if (ICMP_EXC_FRAGTIME == code)
|
goto out_unlock;
|
goto out_unlock;
|
|
|
err = EHOSTUNREACH;
|
err = EHOSTUNREACH;
|
break;
|
break;
|
default:
|
default:
|
goto out_unlock;
|
goto out_unlock;
|
}
|
}
|
|
|
inet = inet_sk(sk);
|
inet = inet_sk(sk);
|
if (!sock_owned_by_user(sk) && inet->recverr) {
|
if (!sock_owned_by_user(sk) && inet->recverr) {
|
sk->sk_err = err;
|
sk->sk_err = err;
|
sk->sk_error_report(sk);
|
sk->sk_error_report(sk);
|
} else { /* Only an error on timeout */
|
} else { /* Only an error on timeout */
|
sk->sk_err_soft = err;
|
sk->sk_err_soft = err;
|
}
|
}
|
|
|
out_unlock:
|
out_unlock:
|
sctp_err_finish(sk, ep, asoc);
|
sctp_err_finish(sk, ep, asoc);
|
}
|
}
|
|
|
/*
|
/*
|
* RFC 2960, 8.4 - Handle "Out of the blue" Packets.
|
* RFC 2960, 8.4 - Handle "Out of the blue" Packets.
|
*
|
*
|
* This function scans all the chunks in the OOTB packet to determine if
|
* This function scans all the chunks in the OOTB packet to determine if
|
* the packet should be discarded right away. If a response might be needed
|
* the packet should be discarded right away. If a response might be needed
|
* for this packet, or, if further processing is possible, the packet will
|
* for this packet, or, if further processing is possible, the packet will
|
* be queued to a proper inqueue for the next phase of handling.
|
* be queued to a proper inqueue for the next phase of handling.
|
*
|
*
|
* Output:
|
* Output:
|
* Return 0 - If further processing is needed.
|
* Return 0 - If further processing is needed.
|
* Return 1 - If the packet can be discarded right away.
|
* Return 1 - If the packet can be discarded right away.
|
*/
|
*/
|
int sctp_rcv_ootb(struct sk_buff *skb)
|
int sctp_rcv_ootb(struct sk_buff *skb)
|
{
|
{
|
sctp_chunkhdr_t *ch;
|
sctp_chunkhdr_t *ch;
|
__u8 *ch_end;
|
__u8 *ch_end;
|
sctp_errhdr_t *err;
|
sctp_errhdr_t *err;
|
|
|
ch = (sctp_chunkhdr_t *) skb->data;
|
ch = (sctp_chunkhdr_t *) skb->data;
|
|
|
/* Scan through all the chunks in the packet. */
|
/* Scan through all the chunks in the packet. */
|
do {
|
do {
|
ch_end = ((__u8 *) ch) + WORD_ROUND(ntohs(ch->length));
|
ch_end = ((__u8 *) ch) + WORD_ROUND(ntohs(ch->length));
|
|
|
/* RFC 8.4, 2) If the OOTB packet contains an ABORT chunk, the
|
/* RFC 8.4, 2) If the OOTB packet contains an ABORT chunk, the
|
* receiver MUST silently discard the OOTB packet and take no
|
* receiver MUST silently discard the OOTB packet and take no
|
* further action.
|
* further action.
|
*/
|
*/
|
if (SCTP_CID_ABORT == ch->type)
|
if (SCTP_CID_ABORT == ch->type)
|
goto discard;
|
goto discard;
|
|
|
/* RFC 8.4, 6) If the packet contains a SHUTDOWN COMPLETE
|
/* RFC 8.4, 6) If the packet contains a SHUTDOWN COMPLETE
|
* chunk, the receiver should silently discard the packet
|
* chunk, the receiver should silently discard the packet
|
* and take no further action.
|
* and take no further action.
|
*/
|
*/
|
if (SCTP_CID_SHUTDOWN_COMPLETE == ch->type)
|
if (SCTP_CID_SHUTDOWN_COMPLETE == ch->type)
|
goto discard;
|
goto discard;
|
|
|
/* RFC 8.4, 7) If the packet contains a "Stale cookie" ERROR
|
/* RFC 8.4, 7) If the packet contains a "Stale cookie" ERROR
|
* or a COOKIE ACK the SCTP Packet should be silently
|
* or a COOKIE ACK the SCTP Packet should be silently
|
* discarded.
|
* discarded.
|
*/
|
*/
|
if (SCTP_CID_COOKIE_ACK == ch->type)
|
if (SCTP_CID_COOKIE_ACK == ch->type)
|
goto discard;
|
goto discard;
|
|
|
if (SCTP_CID_ERROR == ch->type) {
|
if (SCTP_CID_ERROR == ch->type) {
|
sctp_walk_errors(err, ch) {
|
sctp_walk_errors(err, ch) {
|
if (SCTP_ERROR_STALE_COOKIE == err->cause)
|
if (SCTP_ERROR_STALE_COOKIE == err->cause)
|
goto discard;
|
goto discard;
|
}
|
}
|
}
|
}
|
|
|
ch = (sctp_chunkhdr_t *) ch_end;
|
ch = (sctp_chunkhdr_t *) ch_end;
|
} while (ch_end < skb->tail);
|
} while (ch_end < skb->tail);
|
|
|
return 0;
|
return 0;
|
|
|
discard:
|
discard:
|
return 1;
|
return 1;
|
}
|
}
|
|
|
/* Insert endpoint into the hash table. */
|
/* Insert endpoint into the hash table. */
|
void __sctp_hash_endpoint(struct sctp_endpoint *ep)
|
void __sctp_hash_endpoint(struct sctp_endpoint *ep)
|
{
|
{
|
struct sctp_ep_common **epp;
|
struct sctp_ep_common **epp;
|
struct sctp_ep_common *epb;
|
struct sctp_ep_common *epb;
|
struct sctp_hashbucket *head;
|
struct sctp_hashbucket *head;
|
|
|
epb = &ep->base;
|
epb = &ep->base;
|
|
|
epb->hashent = sctp_ep_hashfn(epb->bind_addr.port);
|
epb->hashent = sctp_ep_hashfn(epb->bind_addr.port);
|
head = &sctp_ep_hashtable[epb->hashent];
|
head = &sctp_ep_hashtable[epb->hashent];
|
|
|
sctp_write_lock(&head->lock);
|
sctp_write_lock(&head->lock);
|
epp = &head->chain;
|
epp = &head->chain;
|
epb->next = *epp;
|
epb->next = *epp;
|
if (epb->next)
|
if (epb->next)
|
(*epp)->pprev = &epb->next;
|
(*epp)->pprev = &epb->next;
|
*epp = epb;
|
*epp = epb;
|
epb->pprev = epp;
|
epb->pprev = epp;
|
sctp_write_unlock(&head->lock);
|
sctp_write_unlock(&head->lock);
|
}
|
}
|
|
|
/* Add an endpoint to the hash. Local BH-safe. */
|
/* Add an endpoint to the hash. Local BH-safe. */
|
void sctp_hash_endpoint(struct sctp_endpoint *ep)
|
void sctp_hash_endpoint(struct sctp_endpoint *ep)
|
{
|
{
|
sctp_local_bh_disable();
|
sctp_local_bh_disable();
|
__sctp_hash_endpoint(ep);
|
__sctp_hash_endpoint(ep);
|
sctp_local_bh_enable();
|
sctp_local_bh_enable();
|
}
|
}
|
|
|
/* Remove endpoint from the hash table. */
|
/* Remove endpoint from the hash table. */
|
void __sctp_unhash_endpoint(struct sctp_endpoint *ep)
|
void __sctp_unhash_endpoint(struct sctp_endpoint *ep)
|
{
|
{
|
struct sctp_hashbucket *head;
|
struct sctp_hashbucket *head;
|
struct sctp_ep_common *epb;
|
struct sctp_ep_common *epb;
|
|
|
epb = &ep->base;
|
epb = &ep->base;
|
|
|
epb->hashent = sctp_ep_hashfn(epb->bind_addr.port);
|
epb->hashent = sctp_ep_hashfn(epb->bind_addr.port);
|
|
|
head = &sctp_ep_hashtable[epb->hashent];
|
head = &sctp_ep_hashtable[epb->hashent];
|
|
|
sctp_write_lock(&head->lock);
|
sctp_write_lock(&head->lock);
|
|
|
if (epb->pprev) {
|
if (epb->pprev) {
|
if (epb->next)
|
if (epb->next)
|
epb->next->pprev = epb->pprev;
|
epb->next->pprev = epb->pprev;
|
*epb->pprev = epb->next;
|
*epb->pprev = epb->next;
|
epb->pprev = NULL;
|
epb->pprev = NULL;
|
}
|
}
|
|
|
sctp_write_unlock(&head->lock);
|
sctp_write_unlock(&head->lock);
|
}
|
}
|
|
|
/* Remove endpoint from the hash. Local BH-safe. */
|
/* Remove endpoint from the hash. Local BH-safe. */
|
void sctp_unhash_endpoint(struct sctp_endpoint *ep)
|
void sctp_unhash_endpoint(struct sctp_endpoint *ep)
|
{
|
{
|
sctp_local_bh_disable();
|
sctp_local_bh_disable();
|
__sctp_unhash_endpoint(ep);
|
__sctp_unhash_endpoint(ep);
|
sctp_local_bh_enable();
|
sctp_local_bh_enable();
|
}
|
}
|
|
|
/* Look up an endpoint. */
|
/* Look up an endpoint. */
|
struct sctp_endpoint *__sctp_rcv_lookup_endpoint(const union sctp_addr *laddr)
|
struct sctp_endpoint *__sctp_rcv_lookup_endpoint(const union sctp_addr *laddr)
|
{
|
{
|
struct sctp_hashbucket *head;
|
struct sctp_hashbucket *head;
|
struct sctp_ep_common *epb;
|
struct sctp_ep_common *epb;
|
struct sctp_endpoint *ep;
|
struct sctp_endpoint *ep;
|
int hash;
|
int hash;
|
|
|
hash = sctp_ep_hashfn(laddr->v4.sin_port);
|
hash = sctp_ep_hashfn(laddr->v4.sin_port);
|
head = &sctp_ep_hashtable[hash];
|
head = &sctp_ep_hashtable[hash];
|
read_lock(&head->lock);
|
read_lock(&head->lock);
|
for (epb = head->chain; epb; epb = epb->next) {
|
for (epb = head->chain; epb; epb = epb->next) {
|
ep = sctp_ep(epb);
|
ep = sctp_ep(epb);
|
if (sctp_endpoint_is_match(ep, laddr))
|
if (sctp_endpoint_is_match(ep, laddr))
|
goto hit;
|
goto hit;
|
}
|
}
|
|
|
ep = sctp_sk((sctp_get_ctl_sock()))->ep;
|
ep = sctp_sk((sctp_get_ctl_sock()))->ep;
|
epb = &ep->base;
|
epb = &ep->base;
|
|
|
hit:
|
hit:
|
sctp_endpoint_hold(ep);
|
sctp_endpoint_hold(ep);
|
sock_hold(epb->sk);
|
sock_hold(epb->sk);
|
read_unlock(&head->lock);
|
read_unlock(&head->lock);
|
return ep;
|
return ep;
|
}
|
}
|
|
|
/* Add an association to the hash. Local BH-safe. */
|
/* Add an association to the hash. Local BH-safe. */
|
void sctp_hash_established(struct sctp_association *asoc)
|
void sctp_hash_established(struct sctp_association *asoc)
|
{
|
{
|
sctp_local_bh_disable();
|
sctp_local_bh_disable();
|
__sctp_hash_established(asoc);
|
__sctp_hash_established(asoc);
|
sctp_local_bh_enable();
|
sctp_local_bh_enable();
|
}
|
}
|
|
|
/* Insert association into the hash table. */
|
/* Insert association into the hash table. */
|
void __sctp_hash_established(struct sctp_association *asoc)
|
void __sctp_hash_established(struct sctp_association *asoc)
|
{
|
{
|
struct sctp_ep_common **epp;
|
struct sctp_ep_common **epp;
|
struct sctp_ep_common *epb;
|
struct sctp_ep_common *epb;
|
struct sctp_hashbucket *head;
|
struct sctp_hashbucket *head;
|
|
|
epb = &asoc->base;
|
epb = &asoc->base;
|
|
|
/* Calculate which chain this entry will belong to. */
|
/* Calculate which chain this entry will belong to. */
|
epb->hashent = sctp_assoc_hashfn(epb->bind_addr.port, asoc->peer.port);
|
epb->hashent = sctp_assoc_hashfn(epb->bind_addr.port, asoc->peer.port);
|
|
|
head = &sctp_assoc_hashtable[epb->hashent];
|
head = &sctp_assoc_hashtable[epb->hashent];
|
|
|
sctp_write_lock(&head->lock);
|
sctp_write_lock(&head->lock);
|
epp = &head->chain;
|
epp = &head->chain;
|
epb->next = *epp;
|
epb->next = *epp;
|
if (epb->next)
|
if (epb->next)
|
(*epp)->pprev = &epb->next;
|
(*epp)->pprev = &epb->next;
|
*epp = epb;
|
*epp = epb;
|
epb->pprev = epp;
|
epb->pprev = epp;
|
sctp_write_unlock(&head->lock);
|
sctp_write_unlock(&head->lock);
|
}
|
}
|
|
|
/* Remove association from the hash table. Local BH-safe. */
|
/* Remove association from the hash table. Local BH-safe. */
|
void sctp_unhash_established(struct sctp_association *asoc)
|
void sctp_unhash_established(struct sctp_association *asoc)
|
{
|
{
|
sctp_local_bh_disable();
|
sctp_local_bh_disable();
|
__sctp_unhash_established(asoc);
|
__sctp_unhash_established(asoc);
|
sctp_local_bh_enable();
|
sctp_local_bh_enable();
|
}
|
}
|
|
|
/* Remove association from the hash table. */
|
/* Remove association from the hash table. */
|
void __sctp_unhash_established(struct sctp_association *asoc)
|
void __sctp_unhash_established(struct sctp_association *asoc)
|
{
|
{
|
struct sctp_hashbucket *head;
|
struct sctp_hashbucket *head;
|
struct sctp_ep_common *epb;
|
struct sctp_ep_common *epb;
|
|
|
epb = &asoc->base;
|
epb = &asoc->base;
|
|
|
epb->hashent = sctp_assoc_hashfn(epb->bind_addr.port,
|
epb->hashent = sctp_assoc_hashfn(epb->bind_addr.port,
|
asoc->peer.port);
|
asoc->peer.port);
|
|
|
head = &sctp_assoc_hashtable[epb->hashent];
|
head = &sctp_assoc_hashtable[epb->hashent];
|
|
|
sctp_write_lock(&head->lock);
|
sctp_write_lock(&head->lock);
|
|
|
if (epb->pprev) {
|
if (epb->pprev) {
|
if (epb->next)
|
if (epb->next)
|
epb->next->pprev = epb->pprev;
|
epb->next->pprev = epb->pprev;
|
*epb->pprev = epb->next;
|
*epb->pprev = epb->next;
|
epb->pprev = NULL;
|
epb->pprev = NULL;
|
}
|
}
|
|
|
sctp_write_unlock(&head->lock);
|
sctp_write_unlock(&head->lock);
|
}
|
}
|
|
|
/* Look up an association. */
|
/* Look up an association. */
|
struct sctp_association *__sctp_lookup_association(
|
struct sctp_association *__sctp_lookup_association(
|
const union sctp_addr *local,
|
const union sctp_addr *local,
|
const union sctp_addr *peer,
|
const union sctp_addr *peer,
|
struct sctp_transport **pt)
|
struct sctp_transport **pt)
|
{
|
{
|
struct sctp_hashbucket *head;
|
struct sctp_hashbucket *head;
|
struct sctp_ep_common *epb;
|
struct sctp_ep_common *epb;
|
struct sctp_association *asoc;
|
struct sctp_association *asoc;
|
struct sctp_transport *transport;
|
struct sctp_transport *transport;
|
int hash;
|
int hash;
|
|
|
/* Optimize here for direct hit, only listening connections can
|
/* Optimize here for direct hit, only listening connections can
|
* have wildcards anyways.
|
* have wildcards anyways.
|
*/
|
*/
|
hash = sctp_assoc_hashfn(local->v4.sin_port, peer->v4.sin_port);
|
hash = sctp_assoc_hashfn(local->v4.sin_port, peer->v4.sin_port);
|
head = &sctp_assoc_hashtable[hash];
|
head = &sctp_assoc_hashtable[hash];
|
read_lock(&head->lock);
|
read_lock(&head->lock);
|
for (epb = head->chain; epb; epb = epb->next) {
|
for (epb = head->chain; epb; epb = epb->next) {
|
asoc = sctp_assoc(epb);
|
asoc = sctp_assoc(epb);
|
transport = sctp_assoc_is_match(asoc, local, peer);
|
transport = sctp_assoc_is_match(asoc, local, peer);
|
if (transport)
|
if (transport)
|
goto hit;
|
goto hit;
|
}
|
}
|
|
|
read_unlock(&head->lock);
|
read_unlock(&head->lock);
|
|
|
return NULL;
|
return NULL;
|
|
|
hit:
|
hit:
|
*pt = transport;
|
*pt = transport;
|
sctp_association_hold(asoc);
|
sctp_association_hold(asoc);
|
sock_hold(epb->sk);
|
sock_hold(epb->sk);
|
read_unlock(&head->lock);
|
read_unlock(&head->lock);
|
return asoc;
|
return asoc;
|
}
|
}
|
|
|
/* Look up an association. BH-safe. */
|
/* Look up an association. BH-safe. */
|
struct sctp_association *sctp_lookup_association(const union sctp_addr *laddr,
|
struct sctp_association *sctp_lookup_association(const union sctp_addr *laddr,
|
const union sctp_addr *paddr,
|
const union sctp_addr *paddr,
|
struct sctp_transport **transportp)
|
struct sctp_transport **transportp)
|
{
|
{
|
struct sctp_association *asoc;
|
struct sctp_association *asoc;
|
|
|
sctp_local_bh_disable();
|
sctp_local_bh_disable();
|
asoc = __sctp_lookup_association(laddr, paddr, transportp);
|
asoc = __sctp_lookup_association(laddr, paddr, transportp);
|
sctp_local_bh_enable();
|
sctp_local_bh_enable();
|
|
|
return asoc;
|
return asoc;
|
}
|
}
|
|
|
/* Is there an association matching the given local and peer addresses? */
|
/* Is there an association matching the given local and peer addresses? */
|
int sctp_has_association(const union sctp_addr *laddr,
|
int sctp_has_association(const union sctp_addr *laddr,
|
const union sctp_addr *paddr)
|
const union sctp_addr *paddr)
|
{
|
{
|
struct sctp_association *asoc;
|
struct sctp_association *asoc;
|
struct sctp_transport *transport;
|
struct sctp_transport *transport;
|
|
|
if ((asoc = sctp_lookup_association(laddr, paddr, &transport))) {
|
if ((asoc = sctp_lookup_association(laddr, paddr, &transport))) {
|
sock_put(asoc->base.sk);
|
sock_put(asoc->base.sk);
|
sctp_association_put(asoc);
|
sctp_association_put(asoc);
|
return 1;
|
return 1;
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/*
|
/*
|
* SCTP Implementors Guide, 2.18 Handling of address
|
* SCTP Implementors Guide, 2.18 Handling of address
|
* parameters within the INIT or INIT-ACK.
|
* parameters within the INIT or INIT-ACK.
|
*
|
*
|
* D) When searching for a matching TCB upon reception of an INIT
|
* D) When searching for a matching TCB upon reception of an INIT
|
* or INIT-ACK chunk the receiver SHOULD use not only the
|
* or INIT-ACK chunk the receiver SHOULD use not only the
|
* source address of the packet (containing the INIT or
|
* source address of the packet (containing the INIT or
|
* INIT-ACK) but the receiver SHOULD also use all valid
|
* INIT-ACK) but the receiver SHOULD also use all valid
|
* address parameters contained within the chunk.
|
* address parameters contained within the chunk.
|
*
|
*
|
* 2.18.3 Solution description
|
* 2.18.3 Solution description
|
*
|
*
|
* This new text clearly specifies to an implementor the need
|
* This new text clearly specifies to an implementor the need
|
* to look within the INIT or INIT-ACK. Any implementation that
|
* to look within the INIT or INIT-ACK. Any implementation that
|
* does not do this, may not be able to establish associations
|
* does not do this, may not be able to establish associations
|
* in certain circumstances.
|
* in certain circumstances.
|
*
|
*
|
*/
|
*/
|
static struct sctp_association *__sctp_rcv_init_lookup(struct sk_buff *skb,
|
static struct sctp_association *__sctp_rcv_init_lookup(struct sk_buff *skb,
|
const union sctp_addr *laddr, struct sctp_transport **transportp)
|
const union sctp_addr *laddr, struct sctp_transport **transportp)
|
{
|
{
|
struct sctp_association *asoc;
|
struct sctp_association *asoc;
|
union sctp_addr addr;
|
union sctp_addr addr;
|
union sctp_addr *paddr = &addr;
|
union sctp_addr *paddr = &addr;
|
struct sctphdr *sh = (struct sctphdr *) skb->h.raw;
|
struct sctphdr *sh = (struct sctphdr *) skb->h.raw;
|
sctp_chunkhdr_t *ch;
|
sctp_chunkhdr_t *ch;
|
union sctp_params params;
|
union sctp_params params;
|
sctp_init_chunk_t *init;
|
sctp_init_chunk_t *init;
|
struct sctp_transport *transport;
|
struct sctp_transport *transport;
|
struct sctp_af *af;
|
struct sctp_af *af;
|
|
|
ch = (sctp_chunkhdr_t *) skb->data;
|
ch = (sctp_chunkhdr_t *) skb->data;
|
|
|
/* If this is INIT/INIT-ACK look inside the chunk too. */
|
/* If this is INIT/INIT-ACK look inside the chunk too. */
|
switch (ch->type) {
|
switch (ch->type) {
|
case SCTP_CID_INIT:
|
case SCTP_CID_INIT:
|
case SCTP_CID_INIT_ACK:
|
case SCTP_CID_INIT_ACK:
|
break;
|
break;
|
default:
|
default:
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
/*
|
/*
|
* This code will NOT touch anything inside the chunk--it is
|
* This code will NOT touch anything inside the chunk--it is
|
* strictly READ-ONLY.
|
* strictly READ-ONLY.
|
*
|
*
|
* RFC 2960 3 SCTP packet Format
|
* RFC 2960 3 SCTP packet Format
|
*
|
*
|
* Multiple chunks can be bundled into one SCTP packet up to
|
* Multiple chunks can be bundled into one SCTP packet up to
|
* the MTU size, except for the INIT, INIT ACK, and SHUTDOWN
|
* the MTU size, except for the INIT, INIT ACK, and SHUTDOWN
|
* COMPLETE chunks. These chunks MUST NOT be bundled with any
|
* COMPLETE chunks. These chunks MUST NOT be bundled with any
|
* other chunk in a packet. See Section 6.10 for more details
|
* other chunk in a packet. See Section 6.10 for more details
|
* on chunk bundling.
|
* on chunk bundling.
|
*/
|
*/
|
|
|
/* Find the start of the TLVs and the end of the chunk. This is
|
/* Find the start of the TLVs and the end of the chunk. This is
|
* the region we search for address parameters.
|
* the region we search for address parameters.
|
*/
|
*/
|
init = (sctp_init_chunk_t *)skb->data;
|
init = (sctp_init_chunk_t *)skb->data;
|
|
|
/* Walk the parameters looking for embedded addresses. */
|
/* Walk the parameters looking for embedded addresses. */
|
sctp_walk_params(params, init, init_hdr.params) {
|
sctp_walk_params(params, init, init_hdr.params) {
|
|
|
/* Note: Ignoring hostname addresses. */
|
/* Note: Ignoring hostname addresses. */
|
af = sctp_get_af_specific(param_type2af(params.p->type));
|
af = sctp_get_af_specific(param_type2af(params.p->type));
|
if (!af)
|
if (!af)
|
continue;
|
continue;
|
|
|
af->from_addr_param(paddr, params.addr, ntohs(sh->source), 0);
|
af->from_addr_param(paddr, params.addr, ntohs(sh->source), 0);
|
|
|
asoc = __sctp_lookup_association(laddr, paddr, &transport);
|
asoc = __sctp_lookup_association(laddr, paddr, &transport);
|
if (asoc)
|
if (asoc)
|
return asoc;
|
return asoc;
|
}
|
}
|
|
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
/* Lookup an association for an inbound skb. */
|
/* Lookup an association for an inbound skb. */
|
struct sctp_association *__sctp_rcv_lookup(struct sk_buff *skb,
|
struct sctp_association *__sctp_rcv_lookup(struct sk_buff *skb,
|
const union sctp_addr *paddr,
|
const union sctp_addr *paddr,
|
const union sctp_addr *laddr,
|
const union sctp_addr *laddr,
|
struct sctp_transport **transportp)
|
struct sctp_transport **transportp)
|
{
|
{
|
struct sctp_association *asoc;
|
struct sctp_association *asoc;
|
|
|
asoc = __sctp_lookup_association(laddr, paddr, transportp);
|
asoc = __sctp_lookup_association(laddr, paddr, transportp);
|
|
|
/* Further lookup for INIT/INIT-ACK packets.
|
/* Further lookup for INIT/INIT-ACK packets.
|
* SCTP Implementors Guide, 2.18 Handling of address
|
* SCTP Implementors Guide, 2.18 Handling of address
|
* parameters within the INIT or INIT-ACK.
|
* parameters within the INIT or INIT-ACK.
|
*/
|
*/
|
if (!asoc)
|
if (!asoc)
|
asoc = __sctp_rcv_init_lookup(skb, laddr, transportp);
|
asoc = __sctp_rcv_init_lookup(skb, laddr, transportp);
|
|
|
return asoc;
|
return asoc;
|
}
|
}
|
|
|
