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esp: Add a software GRO codepath

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This patch adds GRO ifrastructure and callbacks for ESP on
ipv4 and ipv6.

In case the GRO layer detects an ESP packet, the
esp{4,6}_gro_receive() function does a xfrm state lookup
and calls the xfrm input layer if it finds a matching state.
The packet will be decapsulated and reinjected it into layer 2.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert
2017-02-15 09:40:00 +01:00
parent 54ef207ac8
commit 7785bba299
12 changed files with 288 additions and 7 deletions
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31
net/xfrm/xfrm_input.c
View File

@@ -207,14 +207,23 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
unsigned int family;
int decaps = 0;
int async = 0;
struct xfrm_offload *xo;
bool xfrm_gro = false;
/* A negative encap_type indicates async resumption. */
if (encap_type < 0) {
async = 1;
x = xfrm_input_state(skb);
seq = XFRM_SKB_CB(skb)->seq.input.low;
family = x->outer_mode->afinfo->family;
goto resume;
/* An encap_type of -1 indicates async resumption. */
if (encap_type == -1) {
async = 1;
seq = XFRM_SKB_CB(skb)->seq.input.low;
goto resume;
}
/* encap_type < -1 indicates a GRO call. */
encap_type = 0;
seq = XFRM_SPI_SKB_CB(skb)->seq;
goto lock;
}
daddr = (xfrm_address_t *)(skb_network_header(skb) +
@@ -260,6 +269,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
skb->sp->xvec[skb->sp->len++] = x;
lock:
spin_lock(&x->lock);
if (unlikely(x->km.state != XFRM_STATE_VALID)) {
@@ -381,7 +391,18 @@ resume:
gro_cells_receive(&gro_cells, skb);
return 0;
} else {
return x->inner_mode->afinfo->transport_finish(skb, async);
xo = xfrm_offload(skb);
if (xo)
xfrm_gro = xo->flags & XFRM_GRO;
err = x->inner_mode->afinfo->transport_finish(skb, async);
if (xfrm_gro) {
skb_dst_drop(skb);
gro_cells_receive(&gro_cells, skb);
return err;
}
return err;
}
drop_unlock: