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esp: Add gso handlers for esp4 and esp6

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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>
This commit is contained in:
Steffen Klassert
2017-04-14 10:06:50 +02:00
parent 383d0350f2
commit 7862b4058b
5 changed files with 203 additions and 4 deletions
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8
net/ipv6/esp6.c
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@@ -179,9 +179,14 @@ static struct ip_esp_hdr *esp_output_set_esn(struct sk_buff *skb,
* encryption.
*/
if ((x->props.flags & XFRM_STATE_ESN)) {
struct xfrm_offload *xo = xfrm_offload(skb);
esph = (void *)(skb_transport_header(skb) - sizeof(__be32));
*seqhi = esph->spi;
esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
if (xo)
esph->seq_no = htonl(xo->seq.hi);
else
esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
}
esph->spi = x->id.spi;
@@ -223,7 +228,6 @@ int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info
struct sk_buff *trailer;
int tailen = esp->tailen;
*skb_mac_header(skb) = IPPROTO_ESP;
esph = ip_esp_hdr(skb);
if (!skb_cloned(skb)) {