mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 16:38:12 +00:00
c22bdd2825
Convert all SEC("classifier*") uses to a new and strict SEC("tc")
section name. In reference_tracking selftests switch from ambiguous
searching by program title (section name) to non-ambiguous searching by
name in some selftests, getting closer to completely removing
bpf_object__find_program_by_title().
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210928161946.2512801-4-andrii@kernel.org
78 lines
1.3 KiB
C
78 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/bpf.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_ARRAY);
|
|
__uint(max_entries, 1);
|
|
__uint(key_size, sizeof(__u32));
|
|
__uint(value_size, sizeof(__u32));
|
|
} nop_table SEC(".maps");
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
|
|
__uint(max_entries, 3);
|
|
__uint(key_size, sizeof(__u32));
|
|
__uint(value_size, sizeof(__u32));
|
|
} jmp_table SEC(".maps");
|
|
|
|
int count = 0;
|
|
int noise = 0;
|
|
|
|
__always_inline int subprog_noise(void)
|
|
{
|
|
__u32 key = 0;
|
|
|
|
bpf_map_lookup_elem(&nop_table, &key);
|
|
return 0;
|
|
}
|
|
|
|
__noinline
|
|
int subprog_tail_2(struct __sk_buff *skb)
|
|
{
|
|
if (noise)
|
|
subprog_noise();
|
|
bpf_tail_call_static(skb, &jmp_table, 2);
|
|
return skb->len * 3;
|
|
}
|
|
|
|
__noinline
|
|
int subprog_tail_1(struct __sk_buff *skb)
|
|
{
|
|
bpf_tail_call_static(skb, &jmp_table, 1);
|
|
return skb->len * 2;
|
|
}
|
|
|
|
__noinline
|
|
int subprog_tail(struct __sk_buff *skb)
|
|
{
|
|
bpf_tail_call_static(skb, &jmp_table, 0);
|
|
return skb->len;
|
|
}
|
|
|
|
SEC("tc")
|
|
int classifier_1(struct __sk_buff *skb)
|
|
{
|
|
return subprog_tail_2(skb);
|
|
}
|
|
|
|
SEC("tc")
|
|
int classifier_2(struct __sk_buff *skb)
|
|
{
|
|
count++;
|
|
return subprog_tail_2(skb);
|
|
}
|
|
|
|
SEC("tc")
|
|
int classifier_0(struct __sk_buff *skb)
|
|
{
|
|
return subprog_tail_1(skb);
|
|
}
|
|
|
|
SEC("tc")
|
|
int entry(struct __sk_buff *skb)
|
|
{
|
|
return subprog_tail(skb);
|
|
}
|
|
|
|
char __license[] SEC("license") = "GPL";
|