// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2020 Cloudflare
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#include <errno.h>
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#include <stdbool.h>
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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struct {
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__uint(type, BPF_MAP_TYPE_SOCKMAP);
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__uint(max_entries, 2);
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__type(key, __u32);
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__type(value, __u64);
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} sock_map SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_SOCKHASH);
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__uint(max_entries, 2);
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__type(key, __u32);
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__type(value, __u64);
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} sock_hash SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(max_entries, 2);
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__type(key, int);
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__type(value, unsigned int);
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} verdict_map SEC(".maps");
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static volatile bool test_sockmap; /* toggled by user-space */
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SEC("sk_skb/stream_parser")
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int prog_skb_parser(struct __sk_buff *skb)
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{
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return skb->len;
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}
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SEC("sk_skb/stream_verdict")
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int prog_skb_verdict(struct __sk_buff *skb)
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{
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unsigned int *count;
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__u32 zero = 0;
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int verdict;
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if (test_sockmap)
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verdict = bpf_sk_redirect_map(skb, &sock_map, zero, 0);
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else
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verdict = bpf_sk_redirect_hash(skb, &sock_hash, &zero, 0);
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count = bpf_map_lookup_elem(&verdict_map, &verdict);
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if (count)
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(*count)++;
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return verdict;
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}
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SEC("sk_msg")
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int prog_msg_verdict(struct sk_msg_md *msg)
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{
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unsigned int *count;
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__u32 zero = 0;
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int verdict;
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if (test_sockmap)
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verdict = bpf_msg_redirect_map(msg, &sock_map, zero, 0);
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else
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verdict = bpf_msg_redirect_hash(msg, &sock_hash, &zero, 0);
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count = bpf_map_lookup_elem(&verdict_map, &verdict);
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if (count)
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(*count)++;
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return verdict;
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}
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SEC("sk_reuseport")
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int prog_reuseport(struct sk_reuseport_md *reuse)
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{
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unsigned int *count;
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int err, verdict;
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__u32 zero = 0;
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if (test_sockmap)
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err = bpf_sk_select_reuseport(reuse, &sock_map, &zero, 0);
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else
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err = bpf_sk_select_reuseport(reuse, &sock_hash, &zero, 0);
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verdict = err ? SK_DROP : SK_PASS;
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count = bpf_map_lookup_elem(&verdict_map, &verdict);
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if (count)
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(*count)++;
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return verdict;
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}
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int _version SEC("version") = 1;
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char _license[] SEC("license") = "GPL";
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