1// SPDX-License-Identifier: GPL-2.0 2 3#include <linux/stddef.h> 4#include <linux/bpf.h> 5#include <linux/in.h> 6#include <sys/socket.h> 7 8#include <bpf/bpf_helpers.h> 9#include <bpf/bpf_endian.h> 10 11#include <bpf_sockopt_helpers.h> 12 13#define SERV4_IP 0xc0a801feU /* 192.168.1.254 */ 14#define SERV4_PORT 4040 15 16SEC("cgroup/recvmsg4") 17int recvmsg4_prog(struct bpf_sock_addr *ctx) 18{ 19 struct bpf_sock *sk; 20 21 sk = ctx->sk; 22 if (!sk) 23 return 1; 24 25 if (sk->family != AF_INET) 26 return 1; 27 28 if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM) 29 return 1; 30 31 if (!get_set_sk_priority(ctx)) 32 return 1; 33 34 ctx->user_ip4 = bpf_htonl(SERV4_IP); 35 ctx->user_port = bpf_htons(SERV4_PORT); 36 37 return 1; 38} 39 40char _license[] SEC("license") = "GPL"; 41