Commit 6ab792f5 authored by Ivan Skytte Jorgensen's avatar Ivan Skytte Jorgensen Committed by David S. Miller

[SCTP]: Add support for SCTP_CONTEXT socket option.

Signed-off-by: default avatarIvan Skytte Jorgensen <isj-sctp@i1.dk>
Signed-off-by: default avatarSridhar Samudrala <sri@us.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 882a382c
......@@ -275,6 +275,7 @@ struct sctp_sock {
__u16 default_flags;
__u32 default_context;
__u32 default_timetolive;
__u32 default_rcv_context;
/* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
* the destination address every heartbeat interval. This value
......@@ -1657,6 +1658,9 @@ struct sctp_association {
__u32 default_context;
__u32 default_timetolive;
/* Default receive parameters */
__u32 default_rcv_context;
/* This tracks outbound ssn for a given stream. */
struct sctp_ssnmap *ssnmap;
......
......@@ -95,6 +95,8 @@ enum sctp_optname {
#define SCTP_GET_PEER_ADDR_INFO SCTP_GET_PEER_ADDR_INFO
SCTP_DELAYED_ACK_TIME,
#define SCTP_DELAYED_ACK_TIME SCTP_DELAYED_ACK_TIME
SCTP_CONTEXT, /* Receive Context */
#define SCTP_CONTEXT SCTP_CONTEXT
/* Internal Socket Options. Some of the sctp library functions are
* implemented using these socket options.
......
......@@ -298,6 +298,7 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
asoc->default_flags = sp->default_flags;
asoc->default_context = sp->default_context;
asoc->default_timetolive = sp->default_timetolive;
asoc->default_rcv_context = sp->default_rcv_context;
return asoc;
......
......@@ -2746,6 +2746,46 @@ static int sctp_setsockopt_adaption_layer(struct sock *sk, char __user *optval,
return 0;
}
/*
* 7.1.29. Set or Get the default context (SCTP_CONTEXT)
*
* The context field in the sctp_sndrcvinfo structure is normally only
* used when a failed message is retrieved holding the value that was
* sent down on the actual send call. This option allows the setting of
* a default context on an association basis that will be received on
* reading messages from the peer. This is especially helpful in the
* one-2-many model for an application to keep some reference to an
* internal state machine that is processing messages on the
* association. Note that the setting of this value only effects
* received messages from the peer and does not effect the value that is
* saved with outbound messages.
*/
static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
int optlen)
{
struct sctp_assoc_value params;
struct sctp_sock *sp;
struct sctp_association *asoc;
if (optlen != sizeof(struct sctp_assoc_value))
return -EINVAL;
if (copy_from_user(&params, optval, optlen))
return -EFAULT;
sp = sctp_sk(sk);
if (params.assoc_id != 0) {
asoc = sctp_id2assoc(sk, params.assoc_id);
if (!asoc)
return -EINVAL;
asoc->default_rcv_context = params.assoc_value;
} else {
sp->default_rcv_context = params.assoc_value;
}
return 0;
}
/* API 6.2 setsockopt(), getsockopt()
*
* Applications use setsockopt() and getsockopt() to set or retrieve
......@@ -2857,6 +2897,9 @@ SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
case SCTP_ADAPTION_LAYER:
retval = sctp_setsockopt_adaption_layer(sk, optval, optlen);
break;
case SCTP_CONTEXT:
retval = sctp_setsockopt_context(sk, optval, optlen);
break;
default:
retval = -ENOPROTOOPT;
......@@ -3016,6 +3059,8 @@ SCTP_STATIC int sctp_init_sock(struct sock *sk)
sp->default_context = 0;
sp->default_timetolive = 0;
sp->default_rcv_context = 0;
/* Initialize default setup parameters. These parameters
* can be modified with the SCTP_INITMSG socket option or
* overridden by the SCTP_INIT CMSG.
......@@ -4420,6 +4465,42 @@ static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
return 0;
}
/*
* 7.1.29. Set or Get the default context (SCTP_CONTEXT)
* (chapter and verse is quoted at sctp_setsockopt_context())
*/
static int sctp_getsockopt_context(struct sock *sk, int len,
char __user *optval, int __user *optlen)
{
struct sctp_assoc_value params;
struct sctp_sock *sp;
struct sctp_association *asoc;
if (len != sizeof(struct sctp_assoc_value))
return -EINVAL;
if (copy_from_user(&params, optval, len))
return -EFAULT;
sp = sctp_sk(sk);
if (params.assoc_id != 0) {
asoc = sctp_id2assoc(sk, params.assoc_id);
if (!asoc)
return -EINVAL;
params.assoc_value = asoc->default_rcv_context;
} else {
params.assoc_value = sp->default_rcv_context;
}
if (put_user(len, optlen))
return -EFAULT;
if (copy_to_user(optval, &params, len))
return -EFAULT;
return 0;
}
/*
* 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
*
......@@ -4558,6 +4639,9 @@ SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
retval = sctp_getsockopt_adaption_layer(sk, len, optval,
optlen);
break;
case SCTP_CONTEXT:
retval = sctp_getsockopt_context(sk, len, optval, optlen);
break;
default:
retval = -ENOPROTOOPT;
break;
......
......@@ -849,8 +849,10 @@ void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
*/
sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc);
/* context value that is set via SCTP_CONTEXT socket option. */
sinfo.sinfo_context = event->asoc->default_rcv_context;
/* These fields are not used while receiving. */
sinfo.sinfo_context = 0;
sinfo.sinfo_timetolive = 0;
put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV,
......
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