linux-stable/tools/testing/selftests/bpf/progs/test_tc_peer.c
Daniel Borkmann 9f4c53ca23 bpf, selftests: Add redirect_peer selftest
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
2020-10-11 10:21:04 -07:00

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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";