| #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"; |
| 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 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"; |