| 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 |