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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 | { |
23 | struct tcf_em_nbyte hdr; |
24 | char pattern[0]; |
25 | }; |
26 | |
27 | static int em_nbyte_change(struct tcf_proto *tp, void *data, int data_len, |
28 | struct tcf_ematch *em) |
29 | { |
30 | struct tcf_em_nbyte *nbyte = data; |
31 | |
32 | if (data_len < sizeof(*nbyte) || |
33 | data_len < (sizeof(*nbyte) + nbyte->len)) |
34 | return -EINVAL; |
35 | |
36 | em->datalen = sizeof(*nbyte) + nbyte->len; |
37 | em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL); |
38 | if (em->data == 0UL) |
39 | return -ENOBUFS; |
40 | |
41 | return 0; |
42 | } |
43 | |
44 | static int em_nbyte_match(struct sk_buff *skb, struct tcf_ematch *em, |
45 | struct tcf_pkt_info *info) |
46 | { |
47 | struct nbyte_data *nbyte = (struct nbyte_data *) em->data; |
48 | unsigned char *ptr = tcf_get_base_ptr(skb, nbyte->hdr.layer); |
49 | |
50 | ptr += nbyte->hdr.off; |
51 | |
52 | if (!tcf_valid_offset(skb, ptr, nbyte->hdr.len)) |
53 | return 0; |
54 | |
55 | return !memcmp(ptr + nbyte->hdr.off, nbyte->pattern, nbyte->hdr.len); |
56 | } |
57 | |
58 | static struct tcf_ematch_ops em_nbyte_ops = { |
59 | .kind = TCF_EM_NBYTE, |
60 | .change = em_nbyte_change, |
61 | .match = em_nbyte_match, |
62 | .owner = THIS_MODULE, |
63 | .link = LIST_HEAD_INIT(em_nbyte_ops.link) |
64 | }; |
65 | |
66 | static int __init init_em_nbyte(void) |
67 | { |
68 | return tcf_em_register(&em_nbyte_ops); |
69 | } |
70 | |
71 | static void __exit exit_em_nbyte(void) |
72 | { |
73 | tcf_em_unregister(&em_nbyte_ops); |
74 | } |
75 | |
76 | MODULE_LICENSE("GPL"); |
77 | |
78 | module_init(init_em_nbyte); |
79 | module_exit(exit_em_nbyte); |
80 | |
81 | MODULE_ALIAS_TCF_EMATCH(TCF_EM_NBYTE); |
82 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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