1 files changed, 47 insertions, 0 deletions
diff --git a/samples/bpf/sock_flags.bpf.c b/samples/bpf/sock_flags.bpf.c
new file mode 100644
index 000000000000..0da749f6a9e1
--- /dev/null
+++ b/samples/bpf/sock_flags.bpf.c
@@ -0,0 +1,47 @@
+// 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";