194db0d958
Add test to use get_socket_cookie() from BPF programs of types BPF_PROG_TYPE_SOCK_OPS and BPF_PROG_TYPE_CGROUP_SOCK_ADDR. The test attaches two programs to cgroup, runs TCP server and client in the cgroup and checks that two operations are done properly on client socket when user calls connect(2): 1. In BPF_CGROUP_INET6_CONNECT socket cookie is used as the key to write new value in a map for client socket. 2. In BPF_CGROUP_SOCK_OPS (BPF_SOCK_OPS_TCP_CONNECT_CB callback) the value written in "1." is found by socket cookie, since it's the same socket, and updated. Finally the test verifies the value in the map. Signed-off-by: Andrey Ignatov <rdna@fb.com> Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
61 lines
1.2 KiB
C
61 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (c) 2018 Facebook
|
|
|
|
#include <linux/bpf.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include "bpf_helpers.h"
|
|
#include "bpf_endian.h"
|
|
|
|
struct bpf_map_def SEC("maps") socket_cookies = {
|
|
.type = BPF_MAP_TYPE_HASH,
|
|
.key_size = sizeof(__u64),
|
|
.value_size = sizeof(__u32),
|
|
.max_entries = 1 << 8,
|
|
};
|
|
|
|
SEC("cgroup/connect6")
|
|
int set_cookie(struct bpf_sock_addr *ctx)
|
|
{
|
|
__u32 cookie_value = 0xFF;
|
|
__u64 cookie_key;
|
|
|
|
if (ctx->family != AF_INET6 || ctx->user_family != AF_INET6)
|
|
return 1;
|
|
|
|
cookie_key = bpf_get_socket_cookie(ctx);
|
|
if (bpf_map_update_elem(&socket_cookies, &cookie_key, &cookie_value, 0))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
SEC("sockops")
|
|
int update_cookie(struct bpf_sock_ops *ctx)
|
|
{
|
|
__u32 new_cookie_value;
|
|
__u32 *cookie_value;
|
|
__u64 cookie_key;
|
|
|
|
if (ctx->family != AF_INET6)
|
|
return 1;
|
|
|
|
if (ctx->op != BPF_SOCK_OPS_TCP_CONNECT_CB)
|
|
return 1;
|
|
|
|
cookie_key = bpf_get_socket_cookie(ctx);
|
|
|
|
cookie_value = bpf_map_lookup_elem(&socket_cookies, &cookie_key);
|
|
if (!cookie_value)
|
|
return 1;
|
|
|
|
new_cookie_value = (ctx->local_port << 8) | *cookie_value;
|
|
bpf_map_update_elem(&socket_cookies, &cookie_key, &new_cookie_value, 0);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int _version SEC("version") = 1;
|
|
|
|
char _license[] SEC("license") = "GPL";
|