netdev - How to filter and intercept packets by using net_dev

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Message-ID: <CAJUHuJpjdRLAPBA1TpSG5=gySDyaaKG+CU-v=h3h+davru+pMA@mail.gmail.com>
Date:	Tue, 15 Oct 2013 15:34:17 +0330
From:	Milad khajavi <khajavi@...il.com>
To:	netdev@...r.kernel.org
Subject: How to filter and intercept packets by using net_dev_add api?‏

I'm writing ethernet network driver for linux. I want to receive
packets, edit and resend them. I know how to edit the packet in
packet_interceptor function, but how can I drop incoming packets in
this function??

Yesterday I've asked this question in stackoverflow [1], but since
now, no one reply that.

#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/ip.h>

struct packet_type my_proto;

int packet_interceptor(struct sk_buff *skb,
    struct net_device *dev,
    struct packet_type *pt,
    struct net_device *orig_dev) {

    //// I don't want certain packets go to upper in net_devices for
further processing.
    //// How can I drop sk_buff here?!

  return 0;
}

static int hello_init( void ) {
    printk(KERN_INFO "Hello, world!\n");

    my_proto.type = htons(ETH_P_ALL);
    my_proto.dev = NULL;
    my_proto.func = packet_interceptor;

    dev_add_pack(&my_proto);
    return 0;
}

static void hello_exit(void) {
  dev_remove_pack(&my_proto);
  printk(KERN_INFO "Bye, world\n");
}

module_init(hello_init);
module_exit(hello_exit);

[1] - http://stackoverflow.com/questions/19342252/how-to-filter-and-intercept-linux-packets-by-using-net-dev-add-api

-- 
Milād Khājavi
http://blog.khajavi.ir
Having the source means you can do it yourself.
I tried to change the world, but I couldn’t find the source code.
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