48 строки
1.1 KiB
C
48 строки
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include "vmlinux.h"
|
|
#include "net_shared.h"
|
|
#include <bpf/bpf_helpers.h>
|
|
|
|
SEC("cgroup/sock")
|
|
int bpf_prog1(struct bpf_sock *sk)
|
|
{
|
|
char fmt[] = "socket: family %d type %d protocol %d\n";
|
|
char fmt2[] = "socket: uid %u gid %u\n";
|
|
__u64 gid_uid = bpf_get_current_uid_gid();
|
|
__u32 uid = gid_uid & 0xffffffff;
|
|
__u32 gid = gid_uid >> 32;
|
|
|
|
bpf_trace_printk(fmt, sizeof(fmt), sk->family, sk->type, sk->protocol);
|
|
bpf_trace_printk(fmt2, sizeof(fmt2), uid, gid);
|
|
|
|
/* block AF_INET6, SOCK_DGRAM, IPPROTO_ICMPV6 sockets
|
|
* ie., make ping6 fail
|
|
*/
|
|
if (sk->family == AF_INET6 &&
|
|
sk->type == SOCK_DGRAM &&
|
|
sk->protocol == IPPROTO_ICMPV6)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
SEC("cgroup/sock")
|
|
int bpf_prog2(struct bpf_sock *sk)
|
|
{
|
|
char fmt[] = "socket: family %d type %d protocol %d\n";
|
|
|
|
bpf_trace_printk(fmt, sizeof(fmt), sk->family, sk->type, sk->protocol);
|
|
|
|
/* block AF_INET, SOCK_DGRAM, IPPROTO_ICMP sockets
|
|
* ie., make ping fail
|
|
*/
|
|
if (sk->family == AF_INET &&
|
|
sk->type == SOCK_DGRAM &&
|
|
sk->protocol == IPPROTO_ICMP)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|