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// SPDX-License-Identifier: GPL-2.0
#include <stdint.h>
#include <stdbool.h>
#include <linux/bpf.h>
#include <linux/stddef.h>
#include <linux/pkt_cls.h>
#include <linux/if_ether.h>
#include <linux/ip.h>
#include <bpf/bpf_helpers.h>
volatile const __u32 IFINDEX_SRC;
volatile const __u32 IFINDEX_DST;
static const __u8 src_mac[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55};
static const __u8 dst_mac[] = {0x00, 0x22, 0x33, 0x44, 0x55, 0x66};
SEC("classifier/chk_egress")
int tc_chk(struct __sk_buff *skb)
{
return TC_ACT_SHOT;
}
SEC("classifier/dst_ingress")
int tc_dst(struct __sk_buff *skb)
{
return bpf_redirect_peer(IFINDEX_SRC, 0);
}
SEC("classifier/src_ingress")
int tc_src(struct __sk_buff *skb)
{
return bpf_redirect_peer(IFINDEX_DST, 0);
}
SEC("classifier/dst_ingress_l3")
int tc_dst_l3(struct __sk_buff *skb)
{
return bpf_redirect(IFINDEX_SRC, 0);
}
SEC("classifier/src_ingress_l3")
int tc_src_l3(struct __sk_buff *skb)
{
__u16 proto = skb->protocol;
if (bpf_skb_change_head(skb, ETH_HLEN, 0) != 0)
return TC_ACT_SHOT;
if (bpf_skb_store_bytes(skb, 0, &src_mac, ETH_ALEN, 0) != 0)
return TC_ACT_SHOT;
if (bpf_skb_store_bytes(skb, ETH_ALEN, &dst_mac, ETH_ALEN, 0) != 0)
return TC_ACT_SHOT;
if (bpf_skb_store_bytes(skb, ETH_ALEN + ETH_ALEN, &proto, sizeof(__u16), 0) != 0)
return TC_ACT_SHOT;
return bpf_redirect_peer(IFINDEX_DST, 0);
}
char __license[] SEC("license") = "GPL";
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