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authorHangbin Liu <liuhangbin@gmail.com>2018-08-31 16:52:01 +0800
committerDavid S. Miller <davem@davemloft.net>2018-09-03 19:04:12 -0700
commit36feaac35405e932ad9c321d7a2db8a7e4a4d7ca (patch)
treed42564578858e46effaef8f971580d6ed54182c3 /net/ipv6/ip6_tunnel.c
parent59a03fea131d671a57b8ed3dc446264c61d4b75f (diff)
ip6_tunnel: respect ttl inherit for ip6tnl
man ip-tunnel ttl section says: 0 is a special value meaning that packets inherit the TTL value. IPv4 tunnel respect this in ip_tunnel_xmit(), but IPv6 tunnel has not implement it yet. To make IPv6 behave consistently with IP tunnel, add ipv6 tunnel inherit support. Signed-off-by: Hangbin Liu <liuhangbin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ip6_tunnel.c')
-rw-r--r--net/ipv6/ip6_tunnel.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 5df2a58d945c..419960b0ba16 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1188,7 +1188,15 @@ route_lookup:
init_tel_txopt(&opt, encap_limit);
ipv6_push_frag_opts(skb, &opt.ops, &proto);
}
- hop_limit = hop_limit ? : ip6_dst_hoplimit(dst);
+
+ if (hop_limit == 0) {
+ if (skb->protocol == htons(ETH_P_IP))
+ hop_limit = ip_hdr(skb)->ttl;
+ else if (skb->protocol == htons(ETH_P_IPV6))
+ hop_limit = ipv6_hdr(skb)->hop_limit;
+ else
+ hop_limit = ip6_dst_hoplimit(dst);
+ }
/* Calculate max headroom for all the headers and adjust
* needed_headroom if necessary.