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vti6: Fix dev->max_mtu setting 

[ Upstream commit f8a554b4aa ]

We shouldn't allow a tunnel to have IP_MAX_MTU as MTU, because
another IPv6 header is going on top of our packets. Without this
patch, we might end up building packets bigger than IP_MAX_MTU.

Fixes: b96f9afee4 ("ipv4/6: use core net MTU range checking")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Acked-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Stefano Brivio 2018-03-15 17:17:13 +01:00 committed by Greg Kroah-Hartman
parent 5815901c29
commit b57f0fe6e3
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/ip6_vti.c
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@ -852,7 +852,7 @@ static void vti6_dev_setup(struct net_device *dev)
dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
dev->mtu = ETH_DATA_LEN;
dev->min_mtu = IPV6_MIN_MTU;
dev->max_mtu = IP_MAX_MTU;
dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr);
dev->flags |= IFF_NOARP;
dev->addr_len = sizeof(struct in6_addr);
netif_keep_dst(dev);