66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_endian.h>
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int _version SEC("version") = 1;
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struct {
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__uint(type, BPF_MAP_TYPE_SOCKMAP);
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__uint(max_entries, 20);
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__uint(key_size, sizeof(int));
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__uint(value_size, sizeof(int));
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} sock_map_rx SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_SOCKMAP);
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__uint(max_entries, 20);
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__uint(key_size, sizeof(int));
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__uint(value_size, sizeof(int));
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} sock_map_tx SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_SOCKMAP);
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__uint(max_entries, 20);
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__uint(key_size, sizeof(int));
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__uint(value_size, sizeof(int));
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} sock_map_msg SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(max_entries, 20);
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__type(key, int);
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__type(value, int);
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} sock_map_break SEC(".maps");
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SEC("sk_skb2")
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int bpf_prog2(struct __sk_buff *skb)
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{
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void *data_end = (void *)(long) skb->data_end;
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void *data = (void *)(long) skb->data;
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__u32 lport = skb->local_port;
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__u32 rport = skb->remote_port;
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__u8 *d = data;
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__u8 sk, map;
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if (data + 8 > data_end)
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return SK_DROP;
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map = d[0];
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sk = d[1];
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d[0] = 0xd;
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d[1] = 0xe;
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d[2] = 0xa;
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d[3] = 0xd;
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d[4] = 0xb;
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d[5] = 0xe;
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d[6] = 0xe;
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d[7] = 0xf;
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if (!map)
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return bpf_sk_redirect_map(skb, &sock_map_rx, sk, 0);
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return bpf_sk_redirect_map(skb, &sock_map_tx, sk, 0);
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}
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char _license[] SEC("license") = "GPL";
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