netdev - [PATCH 13/30] ipvs: support scheduling inverse and icmp UDP packets

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: <1442913260-3925-14-git-send-email-pablo@netfilter.org>
Date:	Tue, 22 Sep 2015 11:14:03 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	netfilter-devel@...r.kernel.org
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 13/30] ipvs: support scheduling inverse and icmp UDP packets

From: Alex Gartrell <agartrell@...com>

In the event of an icmp packet, take only the ports instead of trying to
grab the full header.

In the event of an inverse packet, use the source address and port.

Signed-off-by: Alex Gartrell <agartrell@...com>
Acked-by: Julian Anastasov <ja@....bg>
Signed-off-by: Simon Horman <horms@...ge.net.au>
---
 net/netfilter/ipvs/ip_vs_proto_udp.c |   27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_proto_udp.c b/net/netfilter/ipvs/ip_vs_proto_udp.c
index 1403be2..f3aa821 100644
--- a/net/netfilter/ipvs/ip_vs_proto_udp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_udp.c
@@ -36,23 +36,32 @@ udp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
 	struct net *net;
 	struct ip_vs_service *svc;
 	struct udphdr _udph, *uh;
+	__be16 _ports[2], *ports = NULL;
 
-	if (ip_vs_iph_icmp(iph)) {
-		/* TEMPORARY - do not schedule icmp yet */
-		*verdict = NF_ACCEPT;
-		return 0;
+	if (likely(!ip_vs_iph_icmp(iph))) {
+		/* IPv6 fragments, only first fragment will hit this */
+		uh = skb_header_pointer(skb, iph->len, sizeof(_udph), &_udph);
+		if (uh)
+			ports = &uh->source;
+	} else {
+		ports = skb_header_pointer(
+			skb, iph->len, sizeof(_ports), &_ports);
 	}
 
-	/* IPv6 fragments, only first fragment will hit this */
-	uh = skb_header_pointer(skb, iph->len, sizeof(_udph), &_udph);
-	if (uh == NULL) {
+	if (!ports) {
 		*verdict = NF_DROP;
 		return 0;
 	}
+
 	net = skb_net(skb);
 	rcu_read_lock();
-	svc = ip_vs_service_find(net, af, skb->mark, iph->protocol,
-				 &iph->daddr, uh->dest);
+	if (likely(!ip_vs_iph_inverse(iph)))
+		svc = ip_vs_service_find(net, af, skb->mark, iph->protocol,
+					 &iph->daddr, ports[1]);
+	else
+		svc = ip_vs_service_find(net, af, skb->mark, iph->protocol,
+					 &iph->saddr, ports[0]);
+
 	if (svc) {
 		int ignored;
 
-- 
1.7.10.4

--
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