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-rw-r--r--net/ipv4/route.c12
1 files changed, 4 insertions, 8 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 5e1e60546fce..0fcc2d5192bd 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1250,15 +1250,11 @@ static void set_class_tag(struct rtable *rt, u32 tag)
static unsigned int ipv4_default_advmss(const struct dst_entry *dst)
{
- unsigned int advmss = dst_metric_raw(dst, RTAX_ADVMSS);
+ unsigned int header_size = sizeof(struct tcphdr) + sizeof(struct iphdr);
+ unsigned int advmss = max_t(unsigned int, dst->dev->mtu - header_size,
+ ip_rt_min_advmss);
- if (advmss == 0) {
- advmss = max_t(unsigned int, dst->dev->mtu - 40,
- ip_rt_min_advmss);
- if (advmss > 65535 - 40)
- advmss = 65535 - 40;
- }
- return advmss;
+ return min(advmss, IPV4_MAX_PMTU - header_size);
}
static unsigned int ipv4_mtu(const struct dst_entry *dst)

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