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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>
This commit is contained in:
Hangbin Liu 2018-08-31 16:52:01 +08:00 committed by David S. Miller
parent 59a03fea13
commit 36feaac354
1 changed files with 9 additions and 1 deletions
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10
net/ipv6/ip6_tunnel.c
View File

@ -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.