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net/sched: act_vlan: Add {POP,PUSH}_ETH actions

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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).

Change-Id: Ifce1d5fee3eb1741bdc88b22f9000226744cc56c
Signed-off-by: Guillaume Nault gnault@redhat.com
Signed-off-by: David S. Miller davem@davemloft.net
Git-commit: 19fbcb36a39eefbe8912a13ccc02e937b1c418d6
Git-repo: https://android.googlesource.com/kernel/common/
[quic_jguidry@quicinc.com: Added CONFIG_NET_SCHED_ACT_VLAN_QGKI to
 sdxlemur.config]
Signed-off-by: James Wyatt Guidry <quic_jguidry@quicinc.com>
This commit is contained in:
Guillaume Nault 2022-08-08 15:56:32 -07:00 • committed by James Wyatt Guidry
commit bd20869df5
7 changed files with 148 additions and 0 deletions
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4
include/uapi/linux/tc_act/tc_vlan.h
View file

@ -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)