diff options
Diffstat (limited to 'net/core/skbuff.c')
| -rw-r--r-- | net/core/skbuff.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 495fd743a935..8c00be4d8919 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -5490,6 +5490,48 @@ int skb_mpls_push(struct sk_buff *skb, __be32 mpls_lse, __be16 mpls_proto) EXPORT_SYMBOL_GPL(skb_mpls_push); /** + * skb_mpls_pop() - pop the outermost MPLS header + * + * @skb: buffer + * @next_proto: ethertype of header after popped MPLS header + * + * Expects skb->data at mac header. + * + * Returns 0 on success, -errno otherwise. + */ +int skb_mpls_pop(struct sk_buff *skb, __be16 next_proto) +{ + int err; + + if (unlikely(!eth_p_mpls(skb->protocol))) + return -EINVAL; + + err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN); + if (unlikely(err)) + return err; + + skb_postpull_rcsum(skb, mpls_hdr(skb), MPLS_HLEN); + memmove(skb_mac_header(skb) + MPLS_HLEN, skb_mac_header(skb), + skb->mac_len); + + __skb_pull(skb, MPLS_HLEN); + skb_reset_mac_header(skb); + skb_set_network_header(skb, skb->mac_len); + + if (skb->dev && skb->dev->type == ARPHRD_ETHER) { + struct ethhdr *hdr; + + /* use mpls_hdr() to get ethertype to account for VLANs. */ + hdr = (struct ethhdr *)((void *)mpls_hdr(skb) - ETH_HLEN); + skb_mod_eth_type(skb, hdr, next_proto); + } + skb->protocol = next_proto; + + return 0; +} +EXPORT_SYMBOL_GPL(skb_mpls_pop); + +/** * alloc_skb_with_frags - allocate skb with page frags * * @header_len: size of linear part |