netdev - [PATCH net-next 21/24] sctp: use SCTP_FUTURE_ASSOC and add SCTP_CURRENT_ASSOC for SCTP_DEFAULT

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Message-Id: <3ec8b9a5111b19fc30d5f6acfdad7cdb771dc04c.1548659198.git.lucien.xin@gmail.com>
Date:   Mon, 28 Jan 2019 15:08:43 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>, davem@...emloft.net
Subject: [PATCH net-next 21/24] sctp: use SCTP_FUTURE_ASSOC and add SCTP_CURRENT_ASSOC for SCTP_DEFAULT_PRINFO sockopt

Check with SCTP_ALL_ASSOC instead in sctp_setsockopt_default_prinfo and
check with SCTP_FUTURE_ASSOC instead in sctp_getsockopt_default_prinfo,
it's compatible with 0.

SCTP_CURRENT_ASSOC is supported for SCTP_DEFAULT_PRINFO in this patch.

Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 net/sctp/socket.c | 34 +++++++++++++++++++++++++---------
 1 file changed, 25 insertions(+), 9 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 3a954ac..2f70171 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4136,6 +4136,7 @@ static int sctp_setsockopt_default_prinfo(struct sock *sk,
 					  char __user *optval,
 					  unsigned int optlen)
 {
+	struct sctp_sock *sp = sctp_sk(sk);
 	struct sctp_default_prinfo info;
 	struct sctp_association *asoc;
 	int retval = -EINVAL;
@@ -4155,19 +4156,31 @@ static int sctp_setsockopt_default_prinfo(struct sock *sk,
 		info.pr_value = 0;
 
 	asoc = sctp_id2assoc(sk, info.pr_assoc_id);
+	if (!asoc && info.pr_assoc_id > SCTP_ALL_ASSOC &&
+	    sctp_style(sk, UDP))
+		goto out;
+
+	retval = 0;
+
 	if (asoc) {
 		SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
 		asoc->default_timetolive = info.pr_value;
-	} else if (!info.pr_assoc_id) {
-		struct sctp_sock *sp = sctp_sk(sk);
+		goto out;
+	}
 
+	if (info.pr_assoc_id == SCTP_FUTURE_ASSOC ||
+	    info.pr_assoc_id == SCTP_ALL_ASSOC) {
 		SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
 		sp->default_timetolive = info.pr_value;
-	} else {
-		goto out;
 	}
 
-	retval = 0;
+	if (info.pr_assoc_id == SCTP_CURRENT_ASSOC ||
+	    info.pr_assoc_id == SCTP_ALL_ASSOC) {
+		list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
+			SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
+			asoc->default_timetolive = info.pr_value;
+		}
+	}
 
 out:
 	return retval;
@@ -7288,17 +7301,20 @@ static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
 		goto out;
 
 	asoc = sctp_id2assoc(sk, info.pr_assoc_id);
+	if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
+	    sctp_style(sk, UDP)) {
+		retval = -EINVAL;
+		goto out;
+	}
+
 	if (asoc) {
 		info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
 		info.pr_value = asoc->default_timetolive;
-	} else if (!info.pr_assoc_id) {
+	} else {
 		struct sctp_sock *sp = sctp_sk(sk);
 
 		info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
 		info.pr_value = sp->default_timetolive;
-	} else {
-		retval = -EINVAL;
-		goto out;
 	}
 
 	if (put_user(len, optlen))
-- 
2.1.0