| // SPDX-License-Identifier: GPL-2.0 |
| #include <linux/bpf.h> |
| #include <bpf/bpf_helpers.h> |
| |
| #define __unused __attribute__((unused)) |
| |
| struct { |
| __uint(type, BPF_MAP_TYPE_PROG_ARRAY); |
| __uint(max_entries, 1); |
| __uint(key_size, sizeof(__u32)); |
| __uint(value_size, sizeof(__u32)); |
| } jmp_table SEC(".maps"); |
| |
| int done = 0; |
| |
| SEC("tc") |
| int classifier_0(struct __sk_buff *skb __unused) |
| { |
| done = 1; |
| return 0; |
| } |
| |
| static __noinline |
| int subprog_tail(struct __sk_buff *skb) |
| { |
| /* Don't propagate the constant to the caller */ |
| volatile int ret = 1; |
| |
| bpf_tail_call_static(skb, &jmp_table, 0); |
| return ret; |
| } |
| |
| SEC("tc") |
| int entry(struct __sk_buff *skb) |
| { |
| /* Have data on stack which size is not a multiple of 8 */ |
| volatile char arr[1] = {}; |
| |
| return subprog_tail(skb); |
| } |
| |
| char __license[] SEC("license") = "GPL"; |
