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gre: better support for ICMP messages for gre+ipv6 

ipgre_err() can call ip6_err_gen_icmpv6_unreach() for proper
support of ipv4+gre+icmp+ipv6+... frames, used for example
by traceroute/mtr.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-06-18 21:52:05 -07:00 committed by David S. Miller
parent 2d7a3b276b
commit 9b8c6d7bf2
3 changed files with 8 additions and 0 deletions
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1
include/net/ip_tunnels.h
View File

@ -157,6 +157,7 @@ struct tnl_ptk_info {
__be16 proto;
__be32 key;
__be32 seq;
int hdr_len;
};
#define PACKET_RCVD 0

1
net/ipv4/gre_demux.c
View File

@ -117,6 +117,7 @@ int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
if ((*(u8 *)options & 0xF0) != 0x40)
hdr_len += 4;
}
tpi->hdr_len = hdr_len;
return hdr_len;
}
EXPORT_SYMBOL(gre_parse_header);

6
net/ipv4/ip_gre.c
View File

@ -187,6 +187,12 @@ static void ipgre_err(struct sk_buff *skb, u32 info,
if (!t)
return;
#if IS_ENABLED(CONFIG_IPV6)
if (tpi->proto == htons(ETH_P_IPV6) &&
!ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4 + tpi->hdr_len, type))
return;
#endif
if (t->parms.iph.daddr == 0 ||
ipv4_is_multicast(t->parms.iph.daddr))
return;