mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-12 19:44:51 -04:00
Code Issues Packages Projects Releases Wiki Activity

net: gro: fix misuse of CB in udp socket lookup

Browse Source 
This patch fixes a misuse of IP{6}CB(skb) in GRO, while calling to
`udp6_lib_lookup2` when handling udp tunnels. `udp6_lib_lookup2` fetch the
device from CB. The fix changes it to fetch the device from `skb->dev`.
l3mdev case requires special attention since it has a master and a slave
device.

Fixes: a6024562ff ("udp: Add GRO functions to UDP socket")
Reported-by: Gal Pressman <gal@nvidia.com>
Signed-off-by: Richard Gobert <richardbgobert@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Gobert
2023-07-27 17:33:56 +02:00
committed by David S. Miller
parent e346e231b4
commit 7938cd1543
5 changed files with 65 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
include/net/gro.h
View File

@@ -452,6 +452,49 @@ static inline void gro_normal_one(struct napi_struct *napi, struct sk_buff *skb,
gro_normal_list(napi);
}
/* This function is the alternative of 'inet_iif' and 'inet_sdif'
* functions in case we can not rely on fields of IPCB.
*
* The caller must verify skb_valid_dst(skb) is false and skb->dev is initialized.
* The caller must hold the RCU read lock.
*/
static inline void inet_get_iif_sdif(const struct sk_buff *skb, int *iif, int *sdif)
{
*iif = inet_iif(skb) ?: skb->dev->ifindex;
*sdif = 0;
#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
if (netif_is_l3_slave(skb->dev)) {
struct net_device *master = netdev_master_upper_dev_get_rcu(skb->dev);
*sdif = *iif;
*iif = master ? master->ifindex : 0;
}
#endif
}
/* This function is the alternative of 'inet6_iif' and 'inet6_sdif'
* functions in case we can not rely on fields of IP6CB.
*
* The caller must verify skb_valid_dst(skb) is false and skb->dev is initialized.
* The caller must hold the RCU read lock.
*/
static inline void inet6_get_iif_sdif(const struct sk_buff *skb, int *iif, int *sdif)
{
/* using skb->dev->ifindex because skb_dst(skb) is not initialized */
*iif = skb->dev->ifindex;
*sdif = 0;
#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
if (netif_is_l3_slave(skb->dev)) {
struct net_device *master = netdev_master_upper_dev_get_rcu(skb->dev);
*sdif = *iif;
*iif = master ? master->ifindex : 0;
}
#endif
}
extern struct list_head offload_base;
#endif /* _NET_IPV6_GRO_H */