| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | #include "vmlinux.h" |
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| 3 | #include "net_shared.h" |
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| 4 | #include <bpf/bpf_helpers.h> |
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| 5 | |
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| 6 | SEC("cgroup/sock" ) |
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| 7 | int bpf_prog1(struct bpf_sock *sk) |
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| 8 | { |
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| 9 | char fmt[] = "socket: family %d type %d protocol %d\n" ; |
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| 10 | char fmt2[] = "socket: uid %u gid %u\n" ; |
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| 11 | __u64 gid_uid = bpf_get_current_uid_gid(); |
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| 12 | __u32 uid = gid_uid & 0xffffffff; |
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| 13 | __u32 gid = gid_uid >> 32; |
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| 14 | |
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| 15 | bpf_trace_printk(fmt, sizeof(fmt), sk->family, sk->type, sk->protocol); |
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| 16 | bpf_trace_printk(fmt2, sizeof(fmt2), uid, gid); |
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| 17 | |
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| 18 | /* block AF_INET6, SOCK_DGRAM, IPPROTO_ICMPV6 sockets |
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| 19 | * ie., make ping6 fail |
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| 20 | */ |
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| 21 | if (sk->family == AF_INET6 && |
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| 22 | sk->type == SOCK_DGRAM && |
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| 23 | sk->protocol == IPPROTO_ICMPV6) |
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| 24 | return 0; |
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| 25 | |
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| 26 | return 1; |
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| 27 | } |
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| 28 | |
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| 29 | SEC("cgroup/sock" ) |
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| 30 | int bpf_prog2(struct bpf_sock *sk) |
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| 31 | { |
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| 32 | char fmt[] = "socket: family %d type %d protocol %d\n" ; |
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| 33 | |
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| 34 | bpf_trace_printk(fmt, sizeof(fmt), sk->family, sk->type, sk->protocol); |
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| 35 | |
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| 36 | /* block AF_INET, SOCK_DGRAM, IPPROTO_ICMP sockets |
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| 37 | * ie., make ping fail |
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| 38 | */ |
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| 39 | if (sk->family == AF_INET && |
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| 40 | sk->type == SOCK_DGRAM && |
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| 41 | sk->protocol == IPPROTO_ICMP) |
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| 42 | return 0; |
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| 43 | |
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| 44 | return 1; |
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| 45 | } |
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| 46 | |
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| 47 | char _license[] SEC("license" ) = "GPL" ; |
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| 48 | |
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