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Date:   Thu, 21 May 2020 01:37:04 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, viro@...iv.linux.org.uk,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 02/19] compat_ip{,v6}_setsockopt(): enumerate MCAST_... options explicitly

From: Al Viro <viro@...iv.linux.org.uk>

We want to check if optname is among the MCAST_... ones; do that as
an explicit switch.

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 net/ipv4/ip_sockglue.c   | 10 +++++++++-
 net/ipv6/ipv6_sockglue.c | 10 +++++++++-
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 8206047d70b6..3c2c6cd3933b 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1272,9 +1272,17 @@ int compat_ip_setsockopt(struct sock *sk, int level, int optname,
 	if (level != SOL_IP)
 		return -ENOPROTOOPT;
 
-	if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
+	switch (optname) {
+	case MCAST_JOIN_GROUP:
+	case MCAST_LEAVE_GROUP:
+	case MCAST_JOIN_SOURCE_GROUP:
+	case MCAST_LEAVE_SOURCE_GROUP:
+	case MCAST_BLOCK_SOURCE:
+	case MCAST_UNBLOCK_SOURCE:
+	case MCAST_MSFILTER:
 		return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 			ip_setsockopt);
+	}
 
 	err = do_ip_setsockopt(sk, level, optname, optval, optlen);
 #ifdef CONFIG_NETFILTER
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index a0e50cc57e54..96e3f603c8d8 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -973,9 +973,17 @@ int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 	if (level != SOL_IPV6)
 		return -ENOPROTOOPT;
 
-	if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
+	switch (optname) {
+	case MCAST_JOIN_GROUP:
+	case MCAST_LEAVE_GROUP:
+	case MCAST_JOIN_SOURCE_GROUP:
+	case MCAST_LEAVE_SOURCE_GROUP:
+	case MCAST_BLOCK_SOURCE:
+	case MCAST_UNBLOCK_SOURCE:
+	case MCAST_MSFILTER:
 		return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 			ipv6_setsockopt);
+	}
 
 	err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 #ifdef CONFIG_NETFILTER
-- 
2.11.0

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