1 | // SPDX-License-Identifier: GPL-2.0-or-later |
---|---|
2 | /* |
3 | * net/sched/em_u32.c U32 Ematch |
4 | * |
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 | |
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; |
21 | const unsigned char *ptr = skb_network_header(skb); |
22 | |
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, len: sizeof(u32))) |
32 | return 0; |
33 | |
34 | return !(((*(__be32 *) ptr) ^ key->val) & key->mask); |
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 | |
50 | static void __exit exit_em_u32(void) |
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); |
59 | |
60 | MODULE_ALIAS_TCF_EMATCH(TCF_EM_U32); |
61 |