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linux/samples/bpf/sock_flags_kern.c

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samples/bpf: add userspace example for prohibiting sockets Add examples preventing a process in a cgroup from opening a socket based family, protocol and type. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-12-01 17:48:08 +01:00
#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";
samples/bpf: Update cgroup socket examples to use uid gid helper Signed-off-by: David Ahern <dsahern@gmail.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-09-01 00:05:50 +02:00
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;
samples/bpf: add userspace example for prohibiting sockets Add examples preventing a process in a cgroup from opening a socket based family, protocol and type. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-12-01 17:48:08 +01:00
bpf_trace_printk(fmt, sizeof(fmt), sk->family, sk->type, sk->protocol);
samples/bpf: Update cgroup socket examples to use uid gid helper Signed-off-by: David Ahern <dsahern@gmail.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-09-01 00:05:50 +02:00
bpf_trace_printk(fmt2, sizeof(fmt2), uid, gid);
samples/bpf: add userspace example for prohibiting sockets Add examples preventing a process in a cgroup from opening a socket based family, protocol and type. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-12-01 17:48:08 +01:00
/* 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";