74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
#include <linux/bpf.h>
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#include "bpf_helpers.h"
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#include "bpf_util.h"
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#include "bpf_endian.h"
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int _version SEC("version") = 1;
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#define bpf_printk(fmt, ...) \
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({ \
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char ____fmt[] = fmt; \
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bpf_trace_printk(____fmt, sizeof(____fmt), \
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##__VA_ARGS__); \
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})
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struct bpf_map_def SEC("maps") sock_map_rx = {
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.type = BPF_MAP_TYPE_SOCKMAP,
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.key_size = sizeof(int),
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.value_size = sizeof(int),
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.max_entries = 20,
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};
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struct bpf_map_def SEC("maps") sock_map_tx = {
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.type = BPF_MAP_TYPE_SOCKMAP,
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.key_size = sizeof(int),
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.value_size = sizeof(int),
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.max_entries = 20,
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};
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struct bpf_map_def SEC("maps") sock_map_msg = {
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.type = BPF_MAP_TYPE_SOCKMAP,
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.key_size = sizeof(int),
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.value_size = sizeof(int),
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.max_entries = 20,
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};
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struct bpf_map_def SEC("maps") sock_map_break = {
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.type = BPF_MAP_TYPE_ARRAY,
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.key_size = sizeof(int),
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.value_size = sizeof(int),
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.max_entries = 20,
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};
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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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