82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/*
|
|
* net/sched/em_nbyte.c N-Byte ematch
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* Authors: Thomas Graf <tgraf@suug.ch>
|
|
*/
|
|
|
|
#include <linux/gfp.h>
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/tc_ematch/tc_em_nbyte.h>
|
|
#include <net/pkt_cls.h>
|
|
|
|
struct nbyte_data
|
|
{
|
|
struct tcf_em_nbyte hdr;
|
|
char pattern[0];
|
|
};
|
|
|
|
static int em_nbyte_change(struct tcf_proto *tp, void *data, int data_len,
|
|
struct tcf_ematch *em)
|
|
{
|
|
struct tcf_em_nbyte *nbyte = data;
|
|
|
|
if (data_len < sizeof(*nbyte) ||
|
|
data_len < (sizeof(*nbyte) + nbyte->len))
|
|
return -EINVAL;
|
|
|
|
em->datalen = sizeof(*nbyte) + nbyte->len;
|
|
em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL);
|
|
if (em->data == 0UL)
|
|
return -ENOBUFS;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int em_nbyte_match(struct sk_buff *skb, struct tcf_ematch *em,
|
|
struct tcf_pkt_info *info)
|
|
{
|
|
struct nbyte_data *nbyte = (struct nbyte_data *) em->data;
|
|
unsigned char *ptr = tcf_get_base_ptr(skb, nbyte->hdr.layer);
|
|
|
|
ptr += nbyte->hdr.off;
|
|
|
|
if (!tcf_valid_offset(skb, ptr, nbyte->hdr.len))
|
|
return 0;
|
|
|
|
return !memcmp(ptr + nbyte->hdr.off, nbyte->pattern, nbyte->hdr.len);
|
|
}
|
|
|
|
static struct tcf_ematch_ops em_nbyte_ops = {
|
|
.kind = TCF_EM_NBYTE,
|
|
.change = em_nbyte_change,
|
|
.match = em_nbyte_match,
|
|
.owner = THIS_MODULE,
|
|
.link = LIST_HEAD_INIT(em_nbyte_ops.link)
|
|
};
|
|
|
|
static int __init init_em_nbyte(void)
|
|
{
|
|
return tcf_em_register(&em_nbyte_ops);
|
|
}
|
|
|
|
static void __exit exit_em_nbyte(void)
|
|
{
|
|
tcf_em_unregister(&em_nbyte_ops);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(init_em_nbyte);
|
|
module_exit(exit_em_nbyte);
|
|
|
|
MODULE_ALIAS_TCF_EMATCH(TCF_EM_NBYTE);
|