ipv6: Add an error handler for icmp6

pmtu and redirect events are now handled in the protocols error handler,
so add an error handler for icmp6 to do this. It is needed in the case
when we have no socket context. Based on a patch by Duan Jiong.

Reported-by: Duan Jiong <djduanjiong@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index b4a9fd51dae74bd8143b2d32e791e089f1d8562f..fff5bdd8b6800d56679957a62e201e84fd846d09 100644 (file)
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -81,10 +81,22 @@ static inline struct sock *icmpv6_sk(struct net *net)
        return net->ipv6.icmp_sk[smp_processor_id()];
 }
 
+static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+                      u8 type, u8 code, int offset, __be32 info)
+{
+       struct net *net = dev_net(skb->dev);
+
+       if (type == ICMPV6_PKT_TOOBIG)
+               ip6_update_pmtu(skb, net, info, 0, 0);
+       else if (type == NDISC_REDIRECT)
+               ip6_redirect(skb, net, 0, 0);
+}
+
 static int icmpv6_rcv(struct sk_buff *skb);
 
 static const struct inet6_protocol icmpv6_protocol = {
        .handler        =       icmpv6_rcv,
+       .err_handler    =       icmpv6_err,
        .flags          =       INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
 };