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Commit d5886b91 authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

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: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2f5268a9
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+1 −0
Original line number Diff line number Diff line
@@ -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 −0
Original line number Diff line number Diff line
@@ -4560,6 +4560,34 @@ static int sctp_setsockopt_auth_supported(struct sock *sk,
	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 @@ static int sctp_getsockopt_auth_supported(struct sock *sk, int len,
	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;