diff options
| author | Guillaume Nault <gnault@redhat.com> | 2024-06-19 15:34:57 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-06-21 17:34:15 -0700 |
| commit | 31392048f55f98cb01ca709d32d06d926ab9760a (patch) | |
| tree | 60039844971472f7744bf49b0594434822fb842d /drivers/net | |
| parent | 8406b56a91ec458172c4fe1bb13038031e975b6a (diff) | |
vxlan: Pull inner IP header in vxlan_xmit_one().
Ensure the inner IP header is part of the skb's linear data before
setting old_iph. Otherwise, on a non-linear skb, old_iph could point
outside of the packet data.
Unlike classical VXLAN, which always encapsulates Ethernet packets,
VXLAN-GPE can transport IP packets directly. In that case, we need to
look at skb->protocol to figure out if an Ethernet header is present.
Fixes: d342894c5d2f ("vxlan: virtual extensible lan")
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Link: https://patch.msgid.link/2aa75f6fa62ac9dbe4f16ad5ba75dd04a51d4b99.1718804000.git.gnault@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/vxlan/vxlan_core.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c index 567cb3faab70..ba59e92ab941 100644 --- a/drivers/net/vxlan/vxlan_core.c +++ b/drivers/net/vxlan/vxlan_core.c @@ -2339,7 +2339,7 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, struct ip_tunnel_key *pkey; struct ip_tunnel_key key; struct vxlan_dev *vxlan = netdev_priv(dev); - const struct iphdr *old_iph = ip_hdr(skb); + const struct iphdr *old_iph; struct vxlan_metadata _md; struct vxlan_metadata *md = &_md; unsigned int pkt_len = skb->len; @@ -2353,8 +2353,15 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, bool use_cache; bool udp_sum = false; bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev)); + bool no_eth_encap; __be32 vni = 0; + no_eth_encap = flags & VXLAN_F_GPE && skb->protocol != htons(ETH_P_TEB); + if (!skb_vlan_inet_prepare(skb, no_eth_encap)) + goto drop; + + old_iph = ip_hdr(skb); + info = skb_tunnel_info(skb); use_cache = ip_tunnel_dst_cache_usable(skb, info); |