diff options
Diffstat (limited to 'net/core/skbuff.c')
-rw-r--r-- | net/core/skbuff.c | 37 |
1 files changed, 22 insertions, 15 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index d36c7548952f..cbd19d250947 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -4528,13 +4528,18 @@ EXPORT_SYMBOL(skb_ensure_writable); int __skb_vlan_pop(struct sk_buff *skb, u16 *vlan_tci) { struct vlan_hdr *vhdr; - unsigned int offset = skb->data - skb_mac_header(skb); + int offset = skb->data - skb_mac_header(skb); int err; - __skb_push(skb, offset); + if (WARN_ONCE(offset, + "__skb_vlan_pop got skb with skb->data not at mac header (offset %d)\n", + offset)) { + return -EINVAL; + } + err = skb_ensure_writable(skb, VLAN_ETH_HLEN); if (unlikely(err)) - goto pull; + return err; skb_postpull_rcsum(skb, skb->data + (2 * ETH_ALEN), VLAN_HLEN); @@ -4551,13 +4556,14 @@ int __skb_vlan_pop(struct sk_buff *skb, u16 *vlan_tci) skb_set_network_header(skb, ETH_HLEN); skb_reset_mac_len(skb); -pull: - __skb_pull(skb, offset); return err; } EXPORT_SYMBOL(__skb_vlan_pop); +/* Pop a vlan tag either from hwaccel or from payload. + * Expects skb->data at mac header. + */ int skb_vlan_pop(struct sk_buff *skb) { u16 vlan_tci; @@ -4588,29 +4594,30 @@ int skb_vlan_pop(struct sk_buff *skb) } EXPORT_SYMBOL(skb_vlan_pop); +/* Push a vlan tag either into hwaccel or into payload (if hwaccel tag present). + * Expects skb->data at mac header. + */ int skb_vlan_push(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci) { if (skb_vlan_tag_present(skb)) { - unsigned int offset = skb->data - skb_mac_header(skb); + int offset = skb->data - skb_mac_header(skb); int err; - /* __vlan_insert_tag expect skb->data pointing to mac header. - * So change skb->data before calling it and change back to - * original position later - */ - __skb_push(skb, offset); + if (WARN_ONCE(offset, + "skb_vlan_push got skb with skb->data not at mac header (offset %d)\n", + offset)) { + return -EINVAL; + } + err = __vlan_insert_tag(skb, skb->vlan_proto, skb_vlan_tag_get(skb)); - if (err) { - __skb_pull(skb, offset); + if (err) return err; - } skb->protocol = skb->vlan_proto; skb->mac_len += VLAN_HLEN; skb_postpush_rcsum(skb, skb->data + (2 * ETH_ALEN), VLAN_HLEN); - __skb_pull(skb, offset); } __vlan_hwaccel_put_tag(skb, vlan_proto, vlan_tci); return 0; |