@@ -3448,6 +3448,7 @@ int skb_vlan_pop(struct sk_buff *skb);
int skb_vlan_push(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci);
int skb_mpls_push(struct sk_buff *skb, __be32 mpls_lse, __be16 mpls_proto);
int skb_mpls_pop(struct sk_buff *skb, __be16 next_proto);
+int skb_mpls_update_lse(struct sk_buff *skb, __be32 mpls_lse);
struct sk_buff *pskb_extract(struct sk_buff *skb, int off, int to_copy,
gfp_t gfp);
@@ -5433,6 +5433,39 @@ int skb_mpls_pop(struct sk_buff *skb, __be16 next_proto)
EXPORT_SYMBOL_GPL(skb_mpls_pop);
/**
+ * skb_mpls_update_lse() - modify outermost MPLS header and update csum
+ *
+ * @skb: buffer
+ * @mpls_lse: new MPLS label stack entry to update to
+ *
+ * Expects skb->data at mac header.
+ *
+ * Returns 0 on success, -errno otherwise.
+ */
+int skb_mpls_update_lse(struct sk_buff *skb, __be32 mpls_lse)
+{
+ 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;
+
+ if (skb->ip_summed == CHECKSUM_COMPLETE) {
+ __be32 diff[] = { ~mpls_hdr(skb)->label_stack_entry, mpls_lse };
+
+ skb->csum = csum_partial((char *)diff, sizeof(diff), skb->csum);
+ }
+
+ mpls_hdr(skb)->label_stack_entry = mpls_lse;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(skb_mpls_update_lse);
+
+/**
* alloc_skb_with_frags - allocate skb with page frags
*
* @header_len: size of linear part
@@ -193,19 +193,12 @@ static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key,
__be32 lse;
int err;
- err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN);
- if (unlikely(err))
- return err;
-
stack = mpls_hdr(skb);
lse = OVS_MASKED(stack->label_stack_entry, *mpls_lse, *mask);
- if (skb->ip_summed == CHECKSUM_COMPLETE) {
- __be32 diff[] = { ~(stack->label_stack_entry), lse };
-
- skb->csum = csum_partial((char *)diff, sizeof(diff), skb->csum);
- }
+ err = skb_mpls_update_lse(skb, lse);
+ if (err)
+ return err;
- stack->label_stack_entry = lse;
flow_key->mpls.top_lse = lse;
return 0;
}