ip6_gre: add the process for redirect in ip6gre_err

This patch is to add redirect icmp packet process for ip6gre by
calling ip6_redirect() in ip6gre_err(), as in vti6_err.

Prior to this patch, there's even no route cache generated after
receiving redirect.

Reported-by: Jianlin Shi <jishi@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index 3e10c51..0684d0c 100644 (file)
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -369,6 +369,7 @@ static void ip6gre_tunnel_uninit(struct net_device *dev)
 static void ip6gre_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);
        const struct gre_base_hdr *greh;
        const struct ipv6hdr *ipv6h;
        int grehlen = sizeof(*greh);
@@ -442,6 +443,10 @@ static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
                        mtu = IPV6_MIN_MTU;
                t->dev->mtu = mtu;
                return;
+       case NDISC_REDIRECT:
+               ip6_redirect(skb, net, skb->dev->ifindex, 0,
+                            sock_net_uid(net, NULL));
+               return;
        }
 
        if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))