mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 16:38:12 +00:00
9f4c53ca23
Extend the test_tc_redirect test and add a small test that exercises the new redirect_peer() helper for the IPv4 and IPv6 case. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20201010234006.7075-7-daniel@iogearbox.net
45 lines
868 B
C
45 lines
868 B
C
// 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 <bpf/bpf_helpers.h>
|
|
|
|
enum {
|
|
dev_src,
|
|
dev_dst,
|
|
};
|
|
|
|
struct bpf_map_def SEC("maps") ifindex_map = {
|
|
.type = BPF_MAP_TYPE_ARRAY,
|
|
.key_size = sizeof(int),
|
|
.value_size = sizeof(int),
|
|
.max_entries = 2,
|
|
};
|
|
|
|
static __always_inline int get_dev_ifindex(int which)
|
|
{
|
|
int *ifindex = bpf_map_lookup_elem(&ifindex_map, &which);
|
|
|
|
return ifindex ? *ifindex : 0;
|
|
}
|
|
|
|
SEC("chk_egress") int tc_chk(struct __sk_buff *skb)
|
|
{
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
SEC("dst_ingress") int tc_dst(struct __sk_buff *skb)
|
|
{
|
|
return bpf_redirect_peer(get_dev_ifindex(dev_src), 0);
|
|
}
|
|
|
|
SEC("src_ingress") int tc_src(struct __sk_buff *skb)
|
|
{
|
|
return bpf_redirect_peer(get_dev_ifindex(dev_dst), 0);
|
|
}
|
|
|
|
char __license[] SEC("license") = "GPL";
|