blob: 0cb5656a22b010800e7927b04ef19dd618a7f564 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018 Facebook
#include <linux/bpf.h>
#include <sys/socket.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>
struct socket_cookie {
__u64 cookie_key;
__u32 cookie_value;
};
struct {
__uint(type, BPF_MAP_TYPE_SK_STORAGE);
__uint(map_flags, BPF_F_NO_PREALLOC);
__type(key, int);
__type(value, struct socket_cookie);
} socket_cookies SEC(".maps");
SEC("cgroup/connect6")
int set_cookie(struct bpf_sock_addr *ctx)
{
struct socket_cookie *p;
if (ctx->family != AF_INET6 || ctx->user_family != AF_INET6)
return 1;
p = bpf_sk_storage_get(&socket_cookies, ctx->sk, 0,
BPF_SK_STORAGE_GET_F_CREATE);
if (!p)
return 1;
p->cookie_value = 0xFF;
p->cookie_key = bpf_get_socket_cookie(ctx);
return 1;
}
SEC("sockops")
int update_cookie(struct bpf_sock_ops *ctx)
{
struct bpf_sock *sk;
struct socket_cookie *p;
if (ctx->family != AF_INET6)
return 1;
if (ctx->op != BPF_SOCK_OPS_TCP_CONNECT_CB)
return 1;
if (!ctx->sk)
return 1;
p = bpf_sk_storage_get(&socket_cookies, ctx->sk, 0, 0);
if (!p)
return 1;
if (p->cookie_key != bpf_get_socket_cookie(ctx))
return 1;
p->cookie_value = (ctx->local_port << 8) | p->cookie_value;
return 1;
}
int _version SEC("version") = 1;
char _license[] SEC("license") = "GPL";
|
