Commit 19fbcb36 authored by Guillaume Nault's avatar Guillaume Nault Committed by David S. Miller
Browse files

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: default avatarGuillaume Nault <gnault@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e275d49a

include/linux/skbuff.h

+3 −0
Original line number Diff line number Diff line
@@ -3573,6 +3573,9 @@ int skb_ensure_writable(struct sk_buff *skb, int write_len); 
int __skb_vlan_pop(struct sk_buff *skb, u16 *vlan_tci);

int skb_vlan_pop(struct sk_buff *skb);

int skb_vlan_push(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci);

int skb_eth_pop(struct sk_buff *skb);

int skb_eth_push(struct sk_buff *skb, const unsigned char *dst,

		 const unsigned char *src);

int skb_mpls_push(struct sk_buff *skb, __be32 mpls_lse, __be16 mpls_proto,

		  int mac_len, bool ethernet);

int skb_mpls_pop(struct sk_buff *skb, __be16 next_proto, int mac_len,

include/net/tc_act/tc_vlan.h

+2 −0
Original line number Diff line number Diff line
@@ -11,6 +11,8 @@ 


struct tcf_vlan_params {

	int               tcfv_action;

	unsigned char     tcfv_push_dst[ETH_ALEN];

	unsigned char     tcfv_push_src[ETH_ALEN];

	u16               tcfv_push_vid;

	__be16            tcfv_push_proto;

	u8                tcfv_push_prio;

include/uapi/linux/tc_act/tc_vlan.h

+4 −0
Original line number Diff line number Diff line
@@ -16,6 +16,8 @@ 
#define TCA_VLAN_ACT_POP	1

#define TCA_VLAN_ACT_PUSH	2

#define TCA_VLAN_ACT_MODIFY	3

#define TCA_VLAN_ACT_POP_ETH	4

#define TCA_VLAN_ACT_PUSH_ETH	5



struct tc_vlan {

	tc_gen;
@@ -30,6 +32,8 @@ enum { 
	TCA_VLAN_PUSH_VLAN_PROTOCOL,

	TCA_VLAN_PAD,

	TCA_VLAN_PUSH_VLAN_PRIORITY,

	TCA_VLAN_PUSH_ETH_DST,

	TCA_VLAN_PUSH_ETH_SRC,

	__TCA_VLAN_MAX,

};

#define TCA_VLAN_MAX (__TCA_VLAN_MAX - 1)

net/core/skbuff.c

+67 −0
Original line number Diff line number Diff line
@@ -5558,6 +5558,73 @@ int skb_vlan_push(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci) 
}

EXPORT_SYMBOL(skb_vlan_push);



/**

 * skb_eth_pop() - Drop the Ethernet header at the head of a packet

 *

 * @skb: Socket buffer to modify

 *

 * Drop the Ethernet header of @skb.

 *

 * Expects that skb->data points to the mac header and that no VLAN tags are

 * present.

 *

 * Returns 0 on success, -errno otherwise.

 */

int skb_eth_pop(struct sk_buff *skb)

{

	if (!pskb_may_pull(skb, ETH_HLEN) || skb_vlan_tagged(skb) ||

	    skb_network_offset(skb) < ETH_HLEN)

		return -EPROTO;



	skb_pull_rcsum(skb, ETH_HLEN);

	skb_reset_mac_header(skb);

	skb_reset_mac_len(skb);



	return 0;

}

EXPORT_SYMBOL(skb_eth_pop);



/**

 * skb_eth_push() - Add a new Ethernet header at the head of a packet

 *

 * @skb: Socket buffer to modify

 * @dst: Destination MAC address of the new header

 * @src: Source MAC address of the new header

 *

 * Prepend @skb with a new Ethernet header.

 *

 * Expects that skb->data points to the mac header, which must be empty.

 *

 * Returns 0 on success, -errno otherwise.

 */

int skb_eth_push(struct sk_buff *skb, const unsigned char *dst,

		 const unsigned char *src)

{

	struct ethhdr *eth;

	int err;



	if (skb_network_offset(skb) || skb_vlan_tag_present(skb))

		return -EPROTO;



	err = skb_cow_head(skb, sizeof(*eth));

	if (err < 0)

		return err;



	skb_push(skb, sizeof(*eth));

	skb_reset_mac_header(skb);

	skb_reset_mac_len(skb);



	eth = eth_hdr(skb);

	ether_addr_copy(eth->h_dest, dst);

	ether_addr_copy(eth->h_source, src);

	eth->h_proto = skb->protocol;



	skb_postpush_rcsum(skb, eth, sizeof(*eth));



	return 0;

}

EXPORT_SYMBOL(skb_eth_push);



/* Update the ethertype of hdr and the skb csum value if required. */

static void skb_mod_eth_type(struct sk_buff *skb, struct ethhdr *hdr,

			     __be16 ethertype)

net/openvswitch/actions.c

+10 −18
Original line number Diff line number Diff line
@@ -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;

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