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Commit f8a554b4 authored by Stefano Brivio's avatar Stefano Brivio Committed by Steffen Klassert
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vti6: Fix dev->max_mtu setting 



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: b96f9afe ("ipv4/6: use core net MTU range checking")
Signed-off-by: default avatarStefano Brivio <sbrivio@redhat.com>
Acked-by: default avatarSabrina Dubroca <sd@queasysnail.net>
Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
parent 7a67e69a

net/ipv6/ip6_vti.c

+1 −1
Original line number Diff line number Diff line
@@ -879,7 +879,7 @@ static void vti6_dev_setup(struct net_device *dev) 


	dev->type = ARPHRD_TUNNEL6;

	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);