diff options
| author | David Ahern <dsa@cumulusnetworks.com> | 2016-12-01 08:48:08 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-12-02 13:46:09 -0500 |
| commit | 554ae6e792ef38020b80b4d5127c51d510c0918f (patch) | |
| tree | 546165a4619501f722cb551411164e1b88e693b3 /samples/bpf/sock_flags_kern.c | |
| parent | 4f2e7ae56e04cfe670cf39152a8d015984c90351 (diff) | |
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>
Diffstat (limited to 'samples/bpf/sock_flags_kern.c')
| -rw-r--r-- | samples/bpf/sock_flags_kern.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/samples/bpf/sock_flags_kern.c b/samples/bpf/sock_flags_kern.c new file mode 100644 index 000000000000..533dd11a6baa --- /dev/null +++ b/samples/bpf/sock_flags_kern.c @@ -0,0 +1,44 @@ +#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"; |