From: Hangbin Liu <liuhangbin@gmail.com>
To: netdev@vger.kernel.org
Cc: John Haxby <john.haxby@oracle.com>,
"David S . Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
Jakub Kicinski <kuba@kernel.org>,
stable@vger.kernel.org, Hangbin Liu <liuhangbin@gmail.com>
Subject: [PATCH net] ipv6: fix IPV6_ADDRFORM operation logic
Date: Mon, 1 Jun 2020 11:55:03 +0800 [thread overview]
Message-ID: <20200601035503.3594635-1-liuhangbin@gmail.com> (raw)
Socket option IPV6_ADDRFORM supports UDP/UDPLITE and TCP at present.
Previously the checking logic looks like:
if (sk->sk_protocol == IPPROTO_UDP || sk->sk_protocol == IPPROTO_UDPLITE)
do_some_check;
else if (sk->sk_protocol != IPPROTO_TCP)
break;
After commit b6f6118901d1 ("ipv6: restrict IPV6_ADDRFORM operation"), TCP
was blocked as the logic changed to:
if (sk->sk_protocol == IPPROTO_UDP || sk->sk_protocol == IPPROTO_UDPLITE)
do_some_check;
else if (sk->sk_protocol == IPPROTO_TCP)
do_some_check;
break;
else
break;
Then after commit 82c9ae440857 ("ipv6: fix restrict IPV6_ADDRFORM operation")
UDP/UDPLITE were blocked as the logic changed to:
if (sk->sk_protocol == IPPROTO_UDP || sk->sk_protocol == IPPROTO_UDPLITE)
do_some_check;
if (sk->sk_protocol == IPPROTO_TCP)
do_some_check;
if (sk->sk_protocol != IPPROTO_TCP)
break;
Fix it by using Eric's code and simply remove the break in TCP check, which
looks like:
if (sk->sk_protocol == IPPROTO_UDP || sk->sk_protocol == IPPROTO_UDPLITE)
do_some_check;
else if (sk->sk_protocol == IPPROTO_TCP)
do_some_check;
else
break;
Fixes: 82c9ae440857 ("ipv6: fix restrict IPV6_ADDRFORM operation")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
net/ipv6/ipv6_sockglue.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 18d05403d3b5..5af97b4f5df3 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -183,14 +183,15 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
retv = -EBUSY;
break;
}
- }
- if (sk->sk_protocol == IPPROTO_TCP &&
- sk->sk_prot != &tcpv6_prot) {
- retv = -EBUSY;
+ } else if (sk->sk_protocol == IPPROTO_TCP) {
+ if (sk->sk_prot != &tcpv6_prot) {
+ retv = -EBUSY;
+ break;
+ }
+ } else {
break;
}
- if (sk->sk_protocol != IPPROTO_TCP)
- break;
+
if (sk->sk_state != TCP_ESTABLISHED) {
retv = -ENOTCONN;
break;
--
2.25.4
next reply other threads:[~2020-06-01 4:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-01 3:55 Hangbin Liu [this message]
2020-06-01 4:02 ` [PATCH net] ipv6: fix IPV6_ADDRFORM operation logic Hangbin Liu
2020-06-01 22:48 ` David Miller
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