| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* Copyright (c) 2020 Cloudflare */ |
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| 3 | #include "bpf_iter.h" |
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| 4 | #include "bpf_tracing_net.h" |
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| 5 | #include <bpf/bpf_helpers.h> |
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| 6 | #include <bpf/bpf_tracing.h> |
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| 7 | #include <errno.h> |
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| 8 | |
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| 9 | char _license[] SEC("license" ) = "GPL" ; |
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| 10 | |
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| 11 | struct { |
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| 12 | __uint(type, BPF_MAP_TYPE_SOCKMAP); |
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| 13 | __uint(max_entries, 64); |
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| 14 | __type(key, __u32); |
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| 15 | __type(value, __u64); |
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| 16 | } sockmap SEC(".maps" ); |
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| 17 | |
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| 18 | struct { |
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| 19 | __uint(type, BPF_MAP_TYPE_SOCKHASH); |
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| 20 | __uint(max_entries, 64); |
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| 21 | __type(key, __u32); |
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| 22 | __type(value, __u64); |
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| 23 | } sockhash SEC(".maps" ); |
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| 24 | |
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| 25 | struct { |
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| 26 | __uint(type, BPF_MAP_TYPE_SOCKHASH); |
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| 27 | __uint(max_entries, 64); |
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| 28 | __type(key, __u32); |
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| 29 | __type(value, __u64); |
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| 30 | } dst SEC(".maps" ); |
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| 31 | |
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| 32 | __u32 elems = 0; |
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| 33 | __u32 socks = 0; |
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| 34 | |
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| 35 | SEC("iter/sockmap" ) |
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| 36 | int copy(struct bpf_iter__sockmap *ctx) |
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| 37 | { |
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| 38 | struct sock *sk = ctx->sk; |
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| 39 | __u32 tmp, *key = ctx->key; |
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| 40 | int ret; |
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| 41 | |
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| 42 | if (!key) |
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| 43 | return 0; |
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| 44 | |
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| 45 | elems++; |
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| 46 | |
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| 47 | /* We need a temporary buffer on the stack, since the verifier doesn't |
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| 48 | * let us use the pointer from the context as an argument to the helper. |
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| 49 | */ |
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| 50 | tmp = *key; |
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| 51 | |
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| 52 | if (sk) { |
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| 53 | socks++; |
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| 54 | return bpf_map_update_elem(&dst, &tmp, sk, 0) != 0; |
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| 55 | } |
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| 56 | |
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| 57 | ret = bpf_map_delete_elem(&dst, &tmp); |
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| 58 | return ret && ret != -ENOENT; |
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| 59 | } |
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| 60 | |
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