Commit 1d738571 authored May 09, 2018 by Ashwanth Goli

ipv6: remove min MTU check for ipsec tunnels



With 749439bfac ipsec dst's that report a MTU less than
IPV6_MIN_MTU are broken even for packets that are smaller
than IPV6_MIN_MTU.

According to rfc2473#section-7.1

    if the original IPv6 packet is equal or  smaller  than  the
    IPv6 minimum link MTU, the tunnel entry-point node
    encapsulates the original packet, and subsequently
    fragments the resulting IPv6 tunnel packet into IPv6
    fragments that do not exceed the Path MTU to the tunnel
    exit-point.

This patch drops the MTU check for ipsec tunnel destinations.

Change-Id: I36152ec99a955e20ded707fd7269ba11b94a9cfc
Signed-off-by: Ashwanth Goli <ashwanth@codeaurora.org>

parent c091c7a8

net/ipv6/ip6_output.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1276,7 +1276,7 @@ static int ip6_setup_cork(struct sock sk, struct inet_cork_full cork,
		if (np->frag_size)
		mtu = np->frag_size;
		}
		if (mtu < IPV6_MIN_MTU)
		if (!(rt->dst.flags & DST_XFRM_TUNNEL) && mtu < IPV6_MIN_MTU)
		return -EINVAL;
		cork->base.fragsize = mtu;
		if (dst_allfrag(rt->dst.path))