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xfrm: Add encapsulation header offsets while SKB is not encrypted 

Both esp4 and esp6 used to assume that the SKB payload is encrypted
and therefore the inner_network and inner_transport offsets are
not relevant.
When doing crypto offload in the NIC, this is no longer the case
and the NIC driver needs these offsets so it can do TX TCP checksum
offloading.
This patch sets the inner_network and inner_transport members of
the SKB, as well as encapsulation, to reflect the actual positions
of these headers, and removes them only once encryption is done
on the payload.

Signed-off-by: Ilan Tayari <ilant@mellanox.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
zero-colors
Ilan Tayari 2017-04-14 10:07:39 +02:00 committed by Steffen Klassert
parent f6e27114a6
commit f1bd7d659e
5 changed files with 11 additions and 0 deletions
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2
net/ipv4/xfrm4_mode_transport.c
View File

@ -24,6 +24,8 @@ static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb)
struct iphdr *iph = ip_hdr(skb);
int ihl = iph->ihl * 4;
skb_set_inner_transport_header(skb, skb_transport_offset(skb));
skb_set_network_header(skb, -x->props.header_len);
skb->mac_header = skb->network_header +
offsetof(struct iphdr, protocol);

3
net/ipv4/xfrm4_mode_tunnel.c
View File

@ -33,6 +33,9 @@ static int xfrm4_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
struct iphdr *top_iph;
int flags;
skb_set_inner_network_header(skb, skb_network_offset(skb));
skb_set_inner_transport_header(skb, skb_transport_offset(skb));
skb_set_network_header(skb, -x->props.header_len);
skb->mac_header = skb->network_header +
offsetof(struct iphdr, protocol);

1
net/ipv6/xfrm6_mode_transport.c
View File

@ -27,6 +27,7 @@ static int xfrm6_transport_output(struct xfrm_state *x, struct sk_buff *skb)
int hdr_len;
iph = ipv6_hdr(skb);
skb_set_inner_transport_header(skb, skb_transport_offset(skb));
hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);

3
net/ipv6/xfrm6_mode_tunnel.c
View File

@ -36,6 +36,9 @@ static int xfrm6_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
struct ipv6hdr *top_iph;
int dsfield;
skb_set_inner_network_header(skb, skb_network_offset(skb));
skb_set_inner_transport_header(skb, skb_transport_offset(skb));
skb_set_network_header(skb, -x->props.header_len);
skb->mac_header = skb->network_header +
offsetof(struct ipv6hdr, nexthdr);

2
net/xfrm/xfrm_output.c
View File

@ -205,6 +205,7 @@ int xfrm_output(struct sock *sk, struct sk_buff *skb)
int err;
secpath_reset(skb);
skb->encapsulation = 0;
if (xfrm_dev_offload_ok(skb, x)) {
struct sec_path *sp;
@ -218,6 +219,7 @@ int xfrm_output(struct sock *sk, struct sk_buff *skb)
if (skb->sp)
secpath_put(skb->sp);
skb->sp = sp;
skb->encapsulation = 1;
sp->olen++;
sp->xvec[skb->sp->len++] = x;