1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2018 Facebook
5 #include <sys/socket.h>
7 #include "bpf_helpers.h"
8 #include "bpf_endian.h"
10 struct socket_cookie {
16 __uint(type, BPF_MAP_TYPE_SK_STORAGE);
17 __uint(map_flags, BPF_F_NO_PREALLOC);
19 __type(value, struct socket_cookie);
20 } socket_cookies SEC(".maps");
22 SEC("cgroup/connect6")
23 int set_cookie(struct bpf_sock_addr *ctx)
25 struct socket_cookie *p;
27 if (ctx->family != AF_INET6 || ctx->user_family != AF_INET6)
30 p = bpf_sk_storage_get(&socket_cookies, ctx->sk, 0,
31 BPF_SK_STORAGE_GET_F_CREATE);
35 p->cookie_value = 0xFF;
36 p->cookie_key = bpf_get_socket_cookie(ctx);
42 int update_cookie(struct bpf_sock_ops *ctx)
45 struct socket_cookie *p;
47 if (ctx->family != AF_INET6)
50 if (ctx->op != BPF_SOCK_OPS_TCP_CONNECT_CB)
56 p = bpf_sk_storage_get(&socket_cookies, ctx->sk, 0, 0);
60 if (p->cookie_key != bpf_get_socket_cookie(ctx))
63 p->cookie_value = (ctx->local_port << 8) | p->cookie_value;
68 int _version SEC("version") = 1;
70 char _license[] SEC("license") = "GPL";