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Linux/net/sched/em_nbyte.c

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  1 /*
  2  * net/sched/em_nbyte.c N-Byte ematch
  3  *
  4  *              This program is free software; you can redistribute it and/or
  5  *              modify it under the terms of the GNU General Public License
  6  *              as published by the Free Software Foundation; either version
  7  *              2 of the License, or (at your option) any later version.
  8  *
  9  * Authors:     Thomas Graf <tgraf@suug.ch>
 10  */
 11 
 12 #include <linux/gfp.h>
 13 #include <linux/module.h>
 14 #include <linux/types.h>
 15 #include <linux/kernel.h>
 16 #include <linux/string.h>
 17 #include <linux/skbuff.h>
 18 #include <linux/tc_ematch/tc_em_nbyte.h>
 19 #include <net/pkt_cls.h>
 20 
 21 struct nbyte_data {
 22         struct tcf_em_nbyte     hdr;
 23         char                    pattern[0];
 24 };
 25 
 26 static int em_nbyte_change(struct net *net, void *data, int data_len,
 27                            struct tcf_ematch *em)
 28 {
 29         struct tcf_em_nbyte *nbyte = data;
 30 
 31         if (data_len < sizeof(*nbyte) ||
 32             data_len < (sizeof(*nbyte) + nbyte->len))
 33                 return -EINVAL;
 34 
 35         em->datalen = sizeof(*nbyte) + nbyte->len;
 36         em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL);
 37         if (em->data == 0UL)
 38                 return -ENOBUFS;
 39 
 40         return 0;
 41 }
 42 
 43 static int em_nbyte_match(struct sk_buff *skb, struct tcf_ematch *em,
 44                           struct tcf_pkt_info *info)
 45 {
 46         struct nbyte_data *nbyte = (struct nbyte_data *) em->data;
 47         unsigned char *ptr = tcf_get_base_ptr(skb, nbyte->hdr.layer);
 48 
 49         ptr += nbyte->hdr.off;
 50 
 51         if (!tcf_valid_offset(skb, ptr, nbyte->hdr.len))
 52                 return 0;
 53 
 54         return !memcmp(ptr + nbyte->hdr.off, nbyte->pattern, nbyte->hdr.len);
 55 }
 56 
 57 static struct tcf_ematch_ops em_nbyte_ops = {
 58         .kind     = TCF_EM_NBYTE,
 59         .change   = em_nbyte_change,
 60         .match    = em_nbyte_match,
 61         .owner    = THIS_MODULE,
 62         .link     = LIST_HEAD_INIT(em_nbyte_ops.link)
 63 };
 64 
 65 static int __init init_em_nbyte(void)
 66 {
 67         return tcf_em_register(&em_nbyte_ops);
 68 }
 69 
 70 static void __exit exit_em_nbyte(void)
 71 {
 72         tcf_em_unregister(&em_nbyte_ops);
 73 }
 74 
 75 MODULE_LICENSE("GPL");
 76 
 77 module_init(init_em_nbyte);
 78 module_exit(exit_em_nbyte);
 79 
 80 MODULE_ALIAS_TCF_EMATCH(TCF_EM_NBYTE);
 81 

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