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 | |