blob: d8869b03dda9b066b7a31869256bfc7a88452e53 (
plain)
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
|
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
#include "vmlinux.h"
#include <string.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_core_read.h>
#include "bpf_kfuncs.h"
__u8 SERVUN_REWRITE_ADDRESS[] = "\0bpf_cgroup_unix_test_rewrite";
SEC("cgroup/sendmsg_unix")
int sendmsg_unix_prog(struct bpf_sock_addr *ctx)
{
struct bpf_sock_addr_kern *sa_kern = bpf_cast_to_kern_ctx(ctx);
struct sockaddr_un *sa_kern_unaddr;
__u32 unaddrlen = offsetof(struct sockaddr_un, sun_path) +
sizeof(SERVUN_REWRITE_ADDRESS) - 1;
int ret;
/* Rewrite destination. */
ret = bpf_sock_addr_set_sun_path(sa_kern, SERVUN_REWRITE_ADDRESS,
sizeof(SERVUN_REWRITE_ADDRESS) - 1);
if (ret)
return 0;
if (sa_kern->uaddrlen != unaddrlen)
return 0;
sa_kern_unaddr = bpf_core_cast(sa_kern->uaddr, struct sockaddr_un);
if (memcmp(sa_kern_unaddr->sun_path, SERVUN_REWRITE_ADDRESS,
sizeof(SERVUN_REWRITE_ADDRESS) - 1) != 0)
return 0;
return 1;
}
char _license[] SEC("license") = "GPL";
|
