Ksawlii/kernel_samsung_a53x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

bareudp: Pull inner IP header in bareudp_udp_encap_recv().

Browse source 
[ Upstream commit 45fa29c85117170b0508790f878b13ec6593c888 ]

Bareudp reads the inner IP header to get the ECN value. Therefore, it
needs to ensure that it's part of the skb's linear data.

This is similar to the vxlan and geneve fixes for that same problem:
  * commit f7789419137b ("vxlan: Pull inner IP header in vxlan_rcv().")
  * commit 1ca1ba465e55 ("geneve: make sure to pull inner header in
    geneve_rx()")

Fixes: 571912c69f0e ("net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.")
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/5205940067c40218a70fbb888080466b2fc288db.1726046181.git.gnault@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Guillaume Nault 2024-09-11 11:20:58 +02:00 committed by Ksawlii
parent 854b84d157
commit 626bcd6901
1 changed files with 18 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
drivers/net/bareudp.c
View file

@ -60,6 +60,7 @@ static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
__be16 proto;
void *oiph;
int err;
int nh;
bareudp = rcu_dereference_sk_user_data(sk);
if (!bareudp)
@ -137,10 +138,25 @@ static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
}
skb_dst_set(skb, &tun_dst->dst);
skb->dev = bareudp->dev;
oiph = skb_network_header(skb);
skb_reset_network_header(skb);
skb_reset_mac_header(skb);
/* Save offset of outer header relative to skb->head,
* because we are going to reset the network header to the inner header
* and might change skb->head.
*/
nh = skb_network_header(skb) - skb->head;
skb_reset_network_header(skb);
if (!pskb_inet_may_pull(skb)) {
DEV_STATS_INC(bareudp->dev, rx_length_errors);
DEV_STATS_INC(bareudp->dev, rx_errors);
goto drop;
}
/* Get the outer header. */
oiph = skb->head + nh;
if (!ipv6_mod_enabled() || family == AF_INET)
err = IP_ECN_decapsulate(oiph, skb);
else