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1da177e4 LT |
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 | ||
1da177e4 LT |
12 | #include <linux/module.h> |
13 | #include <linux/types.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/sched.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 | }; | |
10297b99 | 26 | |
1da177e4 LT |
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; | |
c7b1b249 | 37 | em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL); |
1da177e4 LT |
38 | if (em->data == 0UL) |
39 | return -ENOBUFS; | |
40 | ||
1da177e4 LT |
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 | ||
10297b99 | 71 | static void __exit exit_em_nbyte(void) |
1da177e4 LT |
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); |