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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * net/sched/em_u32.c U32 Ematch | |
4 | * | |
1da177e4 LT |
5 | * Authors: Thomas Graf <tgraf@suug.ch> |
6 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
7 | * | |
8 | * Based on net/sched/cls_u32.c | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/types.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <net/pkt_cls.h> | |
16 | ||
17 | static int em_u32_match(struct sk_buff *skb, struct tcf_ematch *em, | |
18 | struct tcf_pkt_info *info) | |
19 | { | |
20 | struct tc_u32_key *key = (struct tc_u32_key *) em->data; | |
d56f90a7 | 21 | const unsigned char *ptr = skb_network_header(skb); |
10297b99 | 22 | |
1da177e4 LT |
23 | if (info) { |
24 | if (info->ptr) | |
25 | ptr = info->ptr; | |
26 | ptr += (info->nexthdr & key->offmask); | |
27 | } | |
28 | ||
29 | ptr += key->off; | |
30 | ||
31 | if (!tcf_valid_offset(skb, ptr, sizeof(u32))) | |
32 | return 0; | |
10297b99 | 33 | |
cc7ec456 | 34 | return !(((*(__be32 *) ptr) ^ key->val) & key->mask); |
1da177e4 LT |
35 | } |
36 | ||
37 | static struct tcf_ematch_ops em_u32_ops = { | |
38 | .kind = TCF_EM_U32, | |
39 | .datalen = sizeof(struct tc_u32_key), | |
40 | .match = em_u32_match, | |
41 | .owner = THIS_MODULE, | |
42 | .link = LIST_HEAD_INIT(em_u32_ops.link) | |
43 | }; | |
44 | ||
45 | static int __init init_em_u32(void) | |
46 | { | |
47 | return tcf_em_register(&em_u32_ops); | |
48 | } | |
49 | ||
10297b99 | 50 | static void __exit exit_em_u32(void) |
1da177e4 LT |
51 | { |
52 | tcf_em_unregister(&em_u32_ops); | |
53 | } | |
54 | ||
55 | MODULE_LICENSE("GPL"); | |
56 | ||
57 | module_init(init_em_u32); | |
58 | module_exit(exit_em_u32); | |
db3d99c0 PM |
59 | |
60 | MODULE_ALIAS_TCF_EMATCH(TCF_EM_U32); |