static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
const struct ovs_action_push_mpls *mpls)
{
__be32 *new_mpls_lse;
struct ethhdr *hdr;
/* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */
if (skb_encapsulation(skb))
return -ENOTSUPP;
if (skb_cow_head(skb, MPLS_HLEN) < 0)
return -ENOMEM;
skb_push(skb, MPLS_HLEN);
memmove(skb_mac_header(skb) - MPLS_HLEN, skb_mac_header(skb),
skb->mac_len);
skb_reset_mac_header(skb);
new_mpls_lse = (__be32 *)skb_mpls_header(skb);
*new_mpls_lse = mpls->mpls_lse;
if (skb->ip_summed == CHECKSUM_COMPLETE)
skb->csum = csum_add(skb->csum, csum_partial(new_mpls_lse,
MPLS_HLEN, 0));
hdr = eth_hdr(skb);
hdr->h_proto = mpls->mpls_ethertype;
if (!ovs_skb_get_inner_protocol(skb))
ovs_skb_set_inner_protocol(skb, skb->protocol);
skb->protocol = mpls->mpls_ethertype;
invalidate_flow_key(key);
return 0;
}
bool skb_is_encapsulated(struct sk_buff *skb)
{
/* checking for inner protocol should be sufficient on newer kernel, but
* old kernel just set encapsulation bit.
*/
/* XXX: set inner protocol for all tunnel in OVS. */
return ovs_skb_get_inner_protocol(skb) || skb_encapsulation(skb);
}
