From d5886b919a720ff859aebf569cb0f353b1d977a6 Mon Sep 17 00:00:00 2001 From: Xin Long Date: Mon, 26 Aug 2019 16:30:04 +0800 Subject: 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 Signed-off-by: David S. Miller --- net/sctp/socket.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) (limited to 'net/sctp') diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 82bc25223cfe..3e50a9712fb1 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -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(¶ms, 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(¶ms, 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, ¶ms, 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; -- cgit v1.2.3