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xfrm: bail early on slave pass over skb

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This is prep work for initial support of bonding hardware encryption
pass-through support. The bonding driver will fill in the slave_dev
pointer, and we use that to know not to skb_push() again on a given
skb that was already processed on the bond device.

CC: Jay Vosburgh <j.vosburgh@gmail.com>
CC: Veaceslav Falico <vfalico@gmail.com>
CC: Andy Gospodarek <andy@greyhouse.net>
CC: "David S. Miller" <davem@davemloft.net>
CC: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
CC: Jakub Kicinski <kuba@kernel.org>
CC: Steffen Klassert <steffen.klassert@secunet.com>
CC: Herbert Xu <herbert@gondor.apana.org.au>
CC: netdev@vger.kernel.org
CC: intel-wired-lan@lists.osuosl.org
Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jarod Wilson 2020-06-19 10:31:52 -04:00 committed by David S. Miller
parent 389cc2f326
commit 272c2330ad
2 changed files with 18 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/net/xfrm.h
View File

@ -127,6 +127,7 @@ struct xfrm_state_walk {
struct xfrm_state_offload {
struct net_device *dev;
struct net_device *slave_dev;
unsigned long offload_handle;
unsigned int num_exthdrs;
u8 flags;

34
net/xfrm/xfrm_device.c
View File

@ -106,6 +106,7 @@ struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t featur
struct sk_buff *skb2, *nskb, *pskb = NULL;
netdev_features_t esp_features = features;
struct xfrm_offload *xo = xfrm_offload(skb);
struct net_device *dev = skb->dev;
struct sec_path *sp;
if (!xo)
@ -119,6 +120,10 @@ struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t featur
if (xo->flags & XFRM_GRO || x->xso.flags & XFRM_OFFLOAD_INBOUND)
return skb;
/* This skb was already validated on the master dev */
if ((x->xso.dev != dev) && (x->xso.slave_dev == dev))
return skb;
local_irq_save(flags);
sd = this_cpu_ptr(&softnet_data);
err = !skb_queue_empty(&sd->xfrm_backlog);
@ -129,25 +134,20 @@ struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t featur
return skb;
}
if (skb_is_gso(skb)) {
struct net_device *dev = skb->dev;
if (skb_is_gso(skb) && unlikely(x->xso.dev != dev)) {
struct sk_buff *segs;
if (unlikely(x->xso.dev != dev)) {
struct sk_buff *segs;
/* Packet got rerouted, fixup features and segment it. */
esp_features = esp_features & ~(NETIF_F_HW_ESP | NETIF_F_GSO_ESP);
/* Packet got rerouted, fixup features and segment it. */
esp_features = esp_features & ~(NETIF_F_HW_ESP
| NETIF_F_GSO_ESP);
segs = skb_gso_segment(skb, esp_features);
if (IS_ERR(segs)) {
kfree_skb(skb);
atomic_long_inc(&dev->tx_dropped);
return NULL;
} else {
consume_skb(skb);
skb = segs;
}
segs = skb_gso_segment(skb, esp_features);
if (IS_ERR(segs)) {
kfree_skb(skb);
atomic_long_inc(&dev->tx_dropped);
return NULL;
} else {
consume_skb(skb);
skb = segs;
}
}