netdev - [PATCH 4/6] netfilter: ipt_ecn: fix inversion for IP header ECN match

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1308253301-29894-5-git-send-email-kaber@trash.net>
Date:	Thu, 16 Jun 2011 21:41:39 +0200
From:	kaber@...sh.net
To:	davem@...emloft.net
Cc:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 4/6] netfilter: ipt_ecn: fix inversion for IP header ECN match

From: Patrick McHardy <kaber@...sh.net>

Userspace allows to specify inversion for IP header ECN matches, the
kernel silently accepts it, but doesn't invert the match result.

Signed-off-by: Patrick McHardy <kaber@...sh.net>
---
 net/ipv4/netfilter/ipt_ecn.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/ipv4/netfilter/ipt_ecn.c b/net/ipv4/netfilter/ipt_ecn.c
index aaa85be..2b57e52 100644
--- a/net/ipv4/netfilter/ipt_ecn.c
+++ b/net/ipv4/netfilter/ipt_ecn.c
@@ -25,7 +25,8 @@ MODULE_LICENSE("GPL");
 static inline bool match_ip(const struct sk_buff *skb,
 			    const struct ipt_ecn_info *einfo)
 {
-	return (ip_hdr(skb)->tos & IPT_ECN_IP_MASK) == einfo->ip_ect;
+	return ((ip_hdr(skb)->tos & IPT_ECN_IP_MASK) == einfo->ip_ect) ^
+	       !!(einfo->invert & IPT_ECN_OP_MATCH_IP);
 }
 
 static inline bool match_tcp(const struct sk_buff *skb,
-- 
1.7.2.3

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html