1 // SPDX-License-Identifier: GPL-2.0 2 #include "vmlinux.h" 3 #include <bpf/bpf_helpers.h> 4 5 struct { 6 __uint(type, BPF_MAP_TYPE_SOCKMAP); 7 __uint(max_entries, 1); 8 __type(key, int); 9 __type(value, int); 10 } sock_map SEC(".maps"); 11 12 #define POP_START 0x48a3 13 #define POP_LEN 0xfffffffd 14 15 long pop_data_ret = 1; 16 17 SEC("sk_msg") 18 int prog_msg_pop_data(struct sk_msg_md *msg) 19 { 20 if (msg->size <= POP_START) 21 return SK_PASS; 22 23 pop_data_ret = bpf_msg_pop_data(msg, POP_START, POP_LEN, 0); 24 return SK_PASS; 25 } 26 27 char _license[] SEC("license") = "GPL"; 28