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sctp: allow users to set ep ecn flag by sockopt 

SCTP_ECN_SUPPORTED sockopt will be added to allow users to change
ep ecn flag, and it's similar with other feature flags.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
alistair/sunxi64-5.4-dsi
Xin Long 2019-08-26 16:30:04 +08:00 committed by David S. Miller
parent 2f5268a924
commit d5886b919a
2 changed files with 74 additions and 0 deletions
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1
include/uapi/linux/sctp.h
View File

@ -136,6 +136,7 @@ typedef __s32 sctp_assoc_t;
#define SCTP_EVENT 127
#define SCTP_ASCONF_SUPPORTED 128
#define SCTP_AUTH_SUPPORTED 129
#define SCTP_ECN_SUPPORTED 130
/* PR-SCTP policies */
#define SCTP_PR_SCTP_NONE 0x0000

73
net/sctp/socket.c
View File

@ -4560,6 +4560,34 @@ out:
return retval;
}
static int sctp_setsockopt_ecn_supported(struct sock *sk,
char __user *optval,
unsigned int optlen)
{
struct sctp_assoc_value params;
struct sctp_association *asoc;
int retval = -EINVAL;
if (optlen != sizeof(params))
goto out;
if (copy_from_user(&params, optval, optlen)) {
retval = -EFAULT;
goto out;
}
asoc = sctp_id2assoc(sk, params.assoc_id);
if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
sctp_style(sk, UDP))
goto out;
sctp_sk(sk)->ep->ecn_enable = !!params.assoc_value;
retval = 0;
out:
return retval;
}
/* API 6.2 setsockopt(), getsockopt()
*
* Applications use setsockopt() and getsockopt() to set or retrieve
@ -4766,6 +4794,9 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
case SCTP_AUTH_SUPPORTED:
retval = sctp_setsockopt_auth_supported(sk, optval, optlen);
break;
case SCTP_ECN_SUPPORTED:
retval = sctp_setsockopt_ecn_supported(sk, optval, optlen);
break;
default:
retval = -ENOPROTOOPT;
break;
@ -7828,6 +7859,45 @@ out:
return retval;
}
static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
char __user *optval,
int __user *optlen)
{
struct sctp_assoc_value params;
struct sctp_association *asoc;
int retval = -EFAULT;
if (len < sizeof(params)) {
retval = -EINVAL;
goto out;
}
len = sizeof(params);
if (copy_from_user(&params, optval, len))
goto out;
asoc = sctp_id2assoc(sk, params.assoc_id);
if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
sctp_style(sk, UDP)) {
retval = -EINVAL;
goto out;
}
params.assoc_value = asoc ? asoc->peer.ecn_capable
: sctp_sk(sk)->ep->ecn_enable;
if (put_user(len, optlen))
goto out;
if (copy_to_user(optval, &params, len))
goto out;
retval = 0;
out:
return retval;
}
static int sctp_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen)
{
@ -8037,6 +8107,9 @@ static int sctp_getsockopt(struct sock *sk, int level, int optname,
retval = sctp_getsockopt_auth_supported(sk, len, optval,
optlen);
break;
case SCTP_ECN_SUPPORTED:
retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
break;
default:
retval = -ENOPROTOOPT;
break;