1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * net/sched/em_u32.c U32 Ematch
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Authors: Thomas Graf <tgraf@suug.ch>
6*4882a593Smuzhiyun * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * Based on net/sched/cls_u32.c
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/module.h>
12*4882a593Smuzhiyun #include <linux/types.h>
13*4882a593Smuzhiyun #include <linux/kernel.h>
14*4882a593Smuzhiyun #include <linux/skbuff.h>
15*4882a593Smuzhiyun #include <net/pkt_cls.h>
16*4882a593Smuzhiyun
em_u32_match(struct sk_buff * skb,struct tcf_ematch * em,struct tcf_pkt_info * info)17*4882a593Smuzhiyun static int em_u32_match(struct sk_buff *skb, struct tcf_ematch *em,
18*4882a593Smuzhiyun struct tcf_pkt_info *info)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun struct tc_u32_key *key = (struct tc_u32_key *) em->data;
21*4882a593Smuzhiyun const unsigned char *ptr = skb_network_header(skb);
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun if (info) {
24*4882a593Smuzhiyun if (info->ptr)
25*4882a593Smuzhiyun ptr = info->ptr;
26*4882a593Smuzhiyun ptr += (info->nexthdr & key->offmask);
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun ptr += key->off;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun if (!tcf_valid_offset(skb, ptr, sizeof(u32)))
32*4882a593Smuzhiyun return 0;
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun return !(((*(__be32 *) ptr) ^ key->val) & key->mask);
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun static struct tcf_ematch_ops em_u32_ops = {
38*4882a593Smuzhiyun .kind = TCF_EM_U32,
39*4882a593Smuzhiyun .datalen = sizeof(struct tc_u32_key),
40*4882a593Smuzhiyun .match = em_u32_match,
41*4882a593Smuzhiyun .owner = THIS_MODULE,
42*4882a593Smuzhiyun .link = LIST_HEAD_INIT(em_u32_ops.link)
43*4882a593Smuzhiyun };
44*4882a593Smuzhiyun
init_em_u32(void)45*4882a593Smuzhiyun static int __init init_em_u32(void)
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun return tcf_em_register(&em_u32_ops);
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
exit_em_u32(void)50*4882a593Smuzhiyun static void __exit exit_em_u32(void)
51*4882a593Smuzhiyun {
52*4882a593Smuzhiyun tcf_em_unregister(&em_u32_ops);
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun MODULE_LICENSE("GPL");
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun module_init(init_em_u32);
58*4882a593Smuzhiyun module_exit(exit_em_u32);
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun MODULE_ALIAS_TCF_EMATCH(TCF_EM_U32);
61