| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|---|
| 2 | |
| 3 | #include <linux/stddef.h> |
| 4 | #include <linux/bpf.h> |
| 5 | #include <linux/in6.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 SERV6_IP_0 0xfaceb00c /* face:b00c:1234:5678::abcd */ |
| 14 | #define SERV6_IP_1 0x12345678 |
| 15 | #define SERV6_IP_2 0x00000000 |
| 16 | #define SERV6_IP_3 0x0000abcd |
| 17 | #define SERV6_PORT 6060 |
| 18 | |
| 19 | SEC("cgroup/recvmsg6") |
| 20 | int recvmsg6_prog(struct bpf_sock_addr *ctx) |
| 21 | { |
| 22 | struct bpf_sock *sk; |
| 23 | |
| 24 | sk = ctx->sk; |
| 25 | if (!sk) |
| 26 | return 1; |
| 27 | |
| 28 | if (sk->family != AF_INET6) |
| 29 | return 1; |
| 30 | |
| 31 | if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM) |
| 32 | return 1; |
| 33 | |
| 34 | if (!get_set_sk_priority(ctx)) |
| 35 | return 1; |
| 36 | |
| 37 | ctx->user_ip6[0] = bpf_htonl(SERV6_IP_0); |
| 38 | ctx->user_ip6[1] = bpf_htonl(SERV6_IP_1); |
| 39 | ctx->user_ip6[2] = bpf_htonl(SERV6_IP_2); |
| 40 | ctx->user_ip6[3] = bpf_htonl(SERV6_IP_3); |
| 41 | ctx->user_port = bpf_htons(SERV6_PORT); |
| 42 | |
| 43 | return 1; |
| 44 | } |
| 45 | |
| 46 | char _license[] SEC("license") = "GPL"; |
| 47 |