60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Cloudflare */
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#include "bpf_iter.h"
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#include "bpf_tracing_net.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include <errno.h>
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char _license[] SEC("license") = "GPL";
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struct {
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__uint(type, BPF_MAP_TYPE_SOCKMAP);
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__uint(max_entries, 64);
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__type(key, __u32);
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__type(value, __u64);
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} sockmap SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_SOCKHASH);
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__uint(max_entries, 64);
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__type(key, __u32);
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__type(value, __u64);
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} sockhash SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_SOCKHASH);
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__uint(max_entries, 64);
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__type(key, __u32);
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__type(value, __u64);
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} dst SEC(".maps");
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__u32 elems = 0;
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__u32 socks = 0;
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SEC("iter/sockmap")
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int copy(struct bpf_iter__sockmap *ctx)
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{
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struct sock *sk = ctx->sk;
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__u32 tmp, *key = ctx->key;
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int ret;
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if (!key)
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return 0;
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elems++;
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/* We need a temporary buffer on the stack, since the verifier doesn't
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* let us use the pointer from the context as an argument to the helper.
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*/
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tmp = *key;
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if (sk) {
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socks++;
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return bpf_map_update_elem(&dst, &tmp, sk, 0) != 0;
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}
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ret = bpf_map_delete_elem(&dst, &tmp);
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return ret && ret != -ENOENT;
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}
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