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authorGuillaume Nault <gnault@redhat.com>2020-10-03 00:44:28 +0200
committerDavid S. Miller <davem@davemloft.net>2020-10-03 17:28:45 -0700
commit19fbcb36a39eefbe8912a13ccc02e937b1c418d6 (patch)
treeb3e9a747a50272805b7f93bdf6739d38da088ef4 /net/openvswitch/actions.c
parente275d49a69c0b8326a16a6e6c8f6d3c672114447 (diff)
net/sched: act_vlan: Add {POP,PUSH}_ETH actions
Implement TCA_VLAN_ACT_POP_ETH and TCA_VLAN_ACT_PUSH_ETH, to respectively pop and push a base Ethernet header at the beginning of a frame. POP_ETH is just a matter of pulling ETH_HLEN bytes. VLAN tags, if any, must be stripped before calling POP_ETH. PUSH_ETH is restricted to skbs with no mac_header, and only the MAC addresses can be configured. The Ethertype is automatically set from skb->protocol. These restrictions ensure that all skb's fields remain consistent, so that this action can't confuse other part of the networking stack (like GSO). Since openvswitch already had these actions, consolidate the code in skbuff.c (like for vlan and mpls push/pop). Signed-off-by: Guillaume Nault <gnault@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/openvswitch/actions.c')
-rw-r--r--net/openvswitch/actions.c28
1 files changed, 10 insertions, 18 deletions
diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 855f2c155956..b87bfc82f44f 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -277,9 +277,11 @@ static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key,
*/
static int pop_eth(struct sk_buff *skb, struct sw_flow_key *key)
{
- skb_pull_rcsum(skb, ETH_HLEN);
- skb_reset_mac_header(skb);
- skb_reset_mac_len(skb);
+ int err;
+
+ err = skb_eth_pop(skb);
+ if (err)
+ return err;
/* safe right before invalidate_flow_key */
key->mac_proto = MAC_PROTO_NONE;
@@ -290,22 +292,12 @@ static int pop_eth(struct sk_buff *skb, struct sw_flow_key *key)
static int push_eth(struct sk_buff *skb, struct sw_flow_key *key,
const struct ovs_action_push_eth *ethh)
{
- struct ethhdr *hdr;
-
- /* Add the new Ethernet header */
- if (skb_cow_head(skb, ETH_HLEN) < 0)
- return -ENOMEM;
-
- skb_push(skb, ETH_HLEN);
- skb_reset_mac_header(skb);
- skb_reset_mac_len(skb);
-
- hdr = eth_hdr(skb);
- ether_addr_copy(hdr->h_source, ethh->addresses.eth_src);
- ether_addr_copy(hdr->h_dest, ethh->addresses.eth_dst);
- hdr->h_proto = skb->protocol;
+ int err;
- skb_postpush_rcsum(skb, hdr, ETH_HLEN);
+ err = skb_eth_push(skb, ethh->addresses.eth_dst,
+ ethh->addresses.eth_src);
+ if (err)
+ return err;
/* safe right before invalidate_flow_key */
key->mac_proto = MAC_PROTO_ETHERNET;