45 lines
986 B
C
45 lines
986 B
C
|
#include <uapi/linux/bpf.h>
|
||
|
|
#include <linux/socket.h>
|
||
|
|
#include <linux/net.h>
|
||
|
|
#include <uapi/linux/in.h>
|
||
|
|
#include <uapi/linux/in6.h>
|
||
|
|
#include "bpf_helpers.h"
|
||
|
|
|
||
|
|
SEC("cgroup/sock1")
|
||
|
|
int bpf_prog1(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 PF_INET6, SOCK_RAW, IPPROTO_ICMPV6 sockets
|
||
|
|
* ie., make ping6 fail
|
||
|
|
*/
|
||
|
|
if (sk->family == PF_INET6 &&
|
||
|
|
sk->type == SOCK_RAW &&
|
||
|
|
sk->protocol == IPPROTO_ICMPV6)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
SEC("cgroup/sock2")
|
||
|
|
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 PF_INET, SOCK_RAW, IPPROTO_ICMP sockets
|
||
|
|
* ie., make ping fail
|
||
|
|
*/
|
||
|
|
if (sk->family == PF_INET &&
|
||
|
|
sk->type == SOCK_RAW &&
|
||
|
|
sk->protocol == IPPROTO_ICMP)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
char _license[] SEC("license") = "GPL";
|