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sctp: add sockopt SCTP_EVENT 

This patch adds sockopt SCTP_EVENT described in rfc6525#section-6.2.
With this sockopt users can subscribe to an event from a specified
asoc.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2018-11-18 16:08:54 +08:00 committed by David S. Miller
parent 88ee48c1f3
commit 480ba9c18a
2 changed files with 95 additions and 0 deletions
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7
include/uapi/linux/sctp.h
View File

@ -129,6 +129,7 @@ typedef __s32 sctp_assoc_t;
#define SCTP_STREAM_SCHEDULER_VALUE 124
#define SCTP_INTERLEAVING_SUPPORTED 125
#define SCTP_SENDMSG_CONNECT 126
#define SCTP_EVENT 127
/* PR-SCTP policies */
#define SCTP_PR_SCTP_NONE 0x0000
@ -1154,6 +1155,12 @@ struct sctp_add_streams {
uint16_t sas_outstrms;
};
struct sctp_event {
sctp_assoc_t se_assoc_id;
uint16_t se_type;
uint8_t se_on;
};
/* SCTP Stream schedulers */
enum sctp_sched_type {
SCTP_SS_FCFS,

88
net/sctp/socket.c
View File

@ -4288,6 +4288,57 @@ static int sctp_setsockopt_reuse_port(struct sock *sk, char __user *optval,
return 0;
}
static int sctp_setsockopt_event(struct sock *sk, char __user *optval,
unsigned int optlen)
{
struct sctp_association *asoc;
struct sctp_ulpevent *event;
struct sctp_event param;
int retval = 0;
if (optlen < sizeof(param)) {
retval = -EINVAL;
goto out;
}
optlen = sizeof(param);
if (copy_from_user(&param, optval, optlen)) {
retval = -EFAULT;
goto out;
}
if (param.se_type < SCTP_SN_TYPE_BASE ||
param.se_type > SCTP_SN_TYPE_MAX) {
retval = -EINVAL;
goto out;
}
asoc = sctp_id2assoc(sk, param.se_assoc_id);
if (!asoc) {
sctp_ulpevent_type_set(&sctp_sk(sk)->subscribe,
param.se_type, param.se_on);
goto out;
}
sctp_ulpevent_type_set(&asoc->subscribe, param.se_type, param.se_on);
if (param.se_type == SCTP_SENDER_DRY_EVENT && param.se_on) {
if (sctp_outq_is_empty(&asoc->outqueue)) {
event = sctp_ulpevent_make_sender_dry_event(asoc,
GFP_USER | __GFP_NOWARN);
if (!event) {
retval = -ENOMEM;
goto out;
}
asoc->stream.si->enqueue_event(&asoc->ulpq, event);
}
}
out:
return retval;
}
/* API 6.2 setsockopt(), getsockopt()
*
* Applications use setsockopt() and getsockopt() to set or retrieve
@ -4485,6 +4536,9 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
case SCTP_REUSE_PORT:
retval = sctp_setsockopt_reuse_port(sk, optval, optlen);
break;
case SCTP_EVENT:
retval = sctp_setsockopt_event(sk, optval, optlen);
break;
default:
retval = -ENOPROTOOPT;
break;
@ -7430,6 +7484,37 @@ static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
return 0;
}
static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
int __user *optlen)
{
struct sctp_association *asoc;
struct sctp_event param;
__u16 subscribe;
if (len < sizeof(param))
return -EINVAL;
len = sizeof(param);
if (copy_from_user(&param, optval, len))
return -EFAULT;
if (param.se_type < SCTP_SN_TYPE_BASE ||
param.se_type > SCTP_SN_TYPE_MAX)
return -EINVAL;
asoc = sctp_id2assoc(sk, param.se_assoc_id);
subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
param.se_on = sctp_ulpevent_type_enabled(subscribe, param.se_type);
if (put_user(len, optlen))
return -EFAULT;
if (copy_to_user(optval, &param, len))
return -EFAULT;
return 0;
}
static int sctp_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen)
{
@ -7628,6 +7713,9 @@ static int sctp_getsockopt(struct sock *sk, int level, int optname,
case SCTP_REUSE_PORT:
retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
break;
case SCTP_EVENT:
retval = sctp_getsockopt_event(sk, len, optval, optlen);
break;
default:
retval = -ENOPROTOOPT;
break;