| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|---|
| 2 | |
| 3 | #include <string.h> |
| 4 | |
| 5 | #include <linux/stddef.h> |
| 6 | #include <linux/bpf.h> |
| 7 | |
| 8 | #include <sys/socket.h> |
| 9 | |
| 10 | #include <bpf/bpf_helpers.h> |
| 11 | #include <bpf/bpf_endian.h> |
| 12 | |
| 13 | #define VERDICT_REJECT 0 |
| 14 | #define VERDICT_PROCEED 1 |
| 15 | |
| 16 | SEC("cgroup/connect4") |
| 17 | int connect_v4_dropper(struct bpf_sock_addr *ctx) |
| 18 | { |
| 19 | if (ctx->type != SOCK_STREAM) |
| 20 | return VERDICT_PROCEED; |
| 21 | if (ctx->user_port == bpf_htons(60120)) |
| 22 | return VERDICT_REJECT; |
| 23 | return VERDICT_PROCEED; |
| 24 | } |
| 25 | |
| 26 | char _license[] SEC("license") = "GPL"; |
| 27 |