esp: Add gso handlers for esp4 and esp6
This patch extends the xfrm_type by an encap function pointer
and implements esp4_gso_encap and esp6_gso_encap. These functions
doing the basic esp encapsulation for a GSO packet. In case the
GSO packet needs to be segmented in software, we add gso_segment
functions. This codepath is going to be used on esp hardware
offloads.
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 91e6a40..4382f30 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -161,11 +161,19 @@ static struct ip_esp_hdr *esp_output_set_extra(struct sk_buff *skb,
* encryption.
*/
if ((x->props.flags & XFRM_STATE_ESN)) {
+ __u32 seqhi;
+ struct xfrm_offload *xo = xfrm_offload(skb);
+
+ if (xo)
+ seqhi = xo->seq.hi;
+ else
+ seqhi = XFRM_SKB_CB(skb)->seq.output.hi;
+
extra->esphoff = (unsigned char *)esph -
skb_transport_header(skb);
esph = (struct ip_esp_hdr *)((unsigned char *)esph - 4);
extra->seqhi = esph->spi;
- esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
+ esph->seq_no = htonl(seqhi);
}
esph->spi = x->id.spi;