// 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";