netdev - [PATCH net-next] IPv6: enable TCP to use an anycast address

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Date:	Sat, 11 Jan 2014 13:07:39 +0100
From:	Francois-Xavier Le Bail <fx.lebail@...oo.com>
To:	netdev@...r.kernel.org
Cc:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki Yoshifuji <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	Francois-Xavier Le Bail <fx.lebail@...oo.com>
Subject: [PATCH net-next] IPv6: enable TCP to use an anycast address

- Use ipv6_anycast_destination() in tcp_v6_send_reset() and
  tcp_v6_conn_request().

Signed-off-by: Francois-Xavier Le Bail <fx.lebail@...oo.com>
---
Tested with link-local and global anycast addresses.
Tested with SOCK_STREAM socket, bind and TCP traffic OK.

 net/ipv6/tcp_ipv6.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index ffd5fa8..85297b8 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -832,7 +832,8 @@ static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
 	if (th->rst)
 		return;
 
-	if (!ipv6_unicast_destination(skb))
+	if (!ipv6_unicast_destination(skb) &&
+	    !ipv6_anycast_destination(skb))
 		return;
 
 #ifdef CONFIG_TCP_MD5SIG
@@ -963,7 +964,8 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 	if (skb->protocol == htons(ETH_P_IP))
 		return tcp_v4_conn_request(sk, skb);
 
-	if (!ipv6_unicast_destination(skb))
+	if (!ipv6_unicast_destination(skb) &&
+	    !ipv6_anycast_destination(skb))
 		goto drop;
 
 	if ((sysctl_tcp_syncookies == 2 ||
--
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