48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include "vmlinux.h"
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#include "net_shared.h"
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#include <bpf/bpf_helpers.h>
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SEC("cgroup/sock")
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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 AF_INET6, SOCK_DGRAM, IPPROTO_ICMPV6 sockets
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* ie., make ping6 fail
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*/
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if (sk->family == AF_INET6 &&
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sk->type == SOCK_DGRAM &&
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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/sock")
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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 AF_INET, SOCK_DGRAM, IPPROTO_ICMP sockets
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* ie., make ping fail
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*/
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if (sk->family == AF_INET &&
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sk->type == SOCK_DGRAM &&
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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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