#include <uapi/linux/bpf.h>
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#include <linux/socket.h>
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#include <linux/net.h>
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#include <uapi/linux/in.h>
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#include <uapi/linux/in6.h>
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#include <bpf/bpf_helpers.h>
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SEC("cgroup/sock1")
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int bpf_prog1(struct bpf_sock *sk)
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{
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char fmt[] = "socket: family %d type %d protocol %d\n";
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char fmt2[] = "socket: uid %u gid %u\n";
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__u64 gid_uid = bpf_get_current_uid_gid();
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__u32 uid = gid_uid & 0xffffffff;
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__u32 gid = gid_uid >> 32;
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bpf_trace_printk(fmt, sizeof(fmt), sk->family, sk->type, sk->protocol);
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bpf_trace_printk(fmt2, sizeof(fmt2), uid, gid);
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/* block PF_INET6, SOCK_RAW, IPPROTO_ICMPV6 sockets
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* ie., make ping6 fail
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*/
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if (sk->family == PF_INET6 &&
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sk->type == SOCK_RAW &&
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sk->protocol == IPPROTO_ICMPV6)
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return 0;
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return 1;
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}
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SEC("cgroup/sock2")
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int bpf_prog2(struct bpf_sock *sk)
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{
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char fmt[] = "socket: family %d type %d protocol %d\n";
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bpf_trace_printk(fmt, sizeof(fmt), sk->family, sk->type, sk->protocol);
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/* block PF_INET, SOCK_RAW, IPPROTO_ICMP sockets
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* ie., make ping fail
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*/
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if (sk->family == PF_INET &&
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sk->type == SOCK_RAW &&
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sk->protocol == IPPROTO_ICMP)
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return 0;
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return 1;
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}
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char _license[] SEC("license") = "GPL";
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