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Commit dc6d0f0b authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'geneve-vxlan-mtu' 



Stefano Brivio says:

====================
geneve, vxlan: Don't set exceptions if skb->len < mtu

This series fixes the exception abuse described in 2/2, and 1/2
is just a preparatory change to make 2/2 less ugly.
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 0ac1077e 6b4f92af

drivers/net/geneve.c

+3 −11
Original line number Diff line number Diff line
@@ -830,12 +830,8 @@ static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 
	if (IS_ERR(rt))

		return PTR_ERR(rt);



	if (skb_dst(skb)) {

		int mtu = dst_mtu(&rt->dst) - GENEVE_IPV4_HLEN -

			  info->options_len;



		skb_dst_update_pmtu(skb, mtu);

	}

	skb_tunnel_check_pmtu(skb, &rt->dst,

			      GENEVE_IPV4_HLEN + info->options_len);



	sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);

	if (geneve->collect_md) {
@@ -876,11 +872,7 @@ static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 
	if (IS_ERR(dst))

		return PTR_ERR(dst);



	if (skb_dst(skb)) {

		int mtu = dst_mtu(dst) - GENEVE_IPV6_HLEN - info->options_len;



		skb_dst_update_pmtu(skb, mtu);

	}

	skb_tunnel_check_pmtu(skb, dst, GENEVE_IPV6_HLEN + info->options_len);



	sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);

	if (geneve->collect_md) {

drivers/net/vxlan.c

+2 −10
Original line number Diff line number Diff line
@@ -2194,11 +2194,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, 
		}



		ndst = &rt->dst;

		if (skb_dst(skb)) {

			int mtu = dst_mtu(ndst) - VXLAN_HEADROOM;



			skb_dst_update_pmtu(skb, mtu);

		}

		skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM);



		tos = ip_tunnel_ecn_encap(tos, old_iph, skb);

		ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
@@ -2235,11 +2231,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, 
				goto out_unlock;

		}



		if (skb_dst(skb)) {

			int mtu = dst_mtu(ndst) - VXLAN6_HEADROOM;



			skb_dst_update_pmtu(skb, mtu);

		}

		skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM);



		tos = ip_tunnel_ecn_encap(tos, old_iph, skb);

		ttl = ttl ? : ip6_dst_hoplimit(ndst);

include/net/dst.h

+10 −0
Original line number Diff line number Diff line
@@ -527,4 +527,14 @@ static inline void skb_dst_update_pmtu(struct sk_buff *skb, u32 mtu) 
		dst->ops->update_pmtu(dst, NULL, skb, mtu);

}



static inline void skb_tunnel_check_pmtu(struct sk_buff *skb,

					 struct dst_entry *encap_dst,

					 int headroom)

{

	u32 encap_mtu = dst_mtu(encap_dst);



	if (skb->len > encap_mtu - headroom)

		skb_dst_update_pmtu(skb, encap_mtu - headroom);

}



#endif /* _NET_DST_H */