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
16 SEC("cgroup/recvmsg4")
17 int 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
40 char _license[] SEC("license") = "GPL";
41
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