1 // SPDX-License-Identifier: GPL-2.0
2
3 #include "vmlinux.h"
4
5 #include <bpf/bpf_helpers.h>
6
7 #define AF_INET6 10
8
9 struct {
10 __uint(type, BPF_MAP_TYPE_SK_STORAGE);
11 __uint(map_flags, BPF_F_NO_PREALLOC);
12 __type(key, int);
13 __type(value, int);
14 } sockops_netns_cookies SEC(".maps");
15
16 struct {
17 __uint(type, BPF_MAP_TYPE_SK_STORAGE);
18 __uint(map_flags, BPF_F_NO_PREALLOC);
19 __type(key, int);
20 __type(value, int);
21 } sk_msg_netns_cookies SEC(".maps");
22
23 struct {
24 __uint(type, BPF_MAP_TYPE_SOCKMAP);
25 __uint(max_entries, 2);
26 __type(key, __u32);
27 __type(value, __u64);
28 } sock_map SEC(".maps");
29
30 SEC("sockops")
31 int get_netns_cookie_sockops(struct bpf_sock_ops *ctx)
32 {
33 struct bpf_sock *sk = ctx->sk;
34 int *cookie;
35 __u32 key = 0;
36
37 if (ctx->family != AF_INET6)
38 return 1;
39
40 if (!sk)
41 return 1;
42
43 switch (ctx->op) {
44 case BPF_SOCK_OPS_TCP_CONNECT_CB:
45 cookie = bpf_sk_storage_get(&sockops_netns_cookies, sk, 0,
46 BPF_SK_STORAGE_GET_F_CREATE);
47 if (!cookie)
48 return 1;
49
50 *cookie = bpf_get_netns_cookie(ctx);
51 break;
52 case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
53 bpf_sock_map_update(ctx, &sock_map, &key, BPF_NOEXIST);
54 break;
55 default:
56 break;
57 }
58
59 return 1;
60 }
61
62 SEC("sk_msg")
63 int get_netns_cookie_sk_msg(struct sk_msg_md *msg)
64 {
65 struct bpf_sock *sk = msg->sk;
66 int *cookie;
67
68 if (msg->family != AF_INET6)
69 return 1;
70
71 if (!sk)
72 return 1;
73
74 cookie = bpf_sk_storage_get(&sk_msg_netns_cookies, sk, 0,
75 BPF_SK_STORAGE_GET_F_CREATE);
76 if (!cookie)
77 return 1;
78
79 *cookie = bpf_get_netns_cookie(msg);
80
81 return 1;
82 }
83
84 char _license[] SEC("license") = "GPL";
85
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