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Commit fdfcb06c authored by Eric Dumazet's avatar Eric Dumazet Committed by Greg Kroah-Hartman
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ipv4: ipv4_default_advmss() should use route mtu 




[ Upstream commit 164a5e7ad531e181334a3d3f03d0d5ad20d6faea ]

ipv4_default_advmss() incorrectly uses the device MTU instead
of the route provided one. IPv6 has the proper behavior,
lets harmonize the two protocols.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 48185ffb

net/ipv4/route.c

+1 −1
Original line number Diff line number Diff line
@@ -1254,7 +1254,7 @@ static void set_class_tag(struct rtable *rt, u32 tag) 
static unsigned int ipv4_default_advmss(const struct dst_entry *dst)

{

	unsigned int header_size = sizeof(struct tcphdr) + sizeof(struct iphdr);

	unsigned int advmss = max_t(unsigned int, dst->dev->mtu - header_size,

	unsigned int advmss = max_t(unsigned int, ipv4_mtu(dst) - header_size,

				    ip_rt_min_advmss);



	return min(advmss, IPV4_MAX_PMTU - header_size);