1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * net/sched/act_meta_tc_index.c IFE skb->tc_index metadata module
4  *
5  * copyright Jamal Hadi Salim (2016)
6 */
7 
8 #include <linux/types.h>
9 #include <linux/kernel.h>
10 #include <linux/string.h>
11 #include <linux/errno.h>
12 #include <linux/skbuff.h>
13 #include <linux/rtnetlink.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <net/netlink.h>
17 #include <net/pkt_sched.h>
18 #include <uapi/linux/tc_act/tc_ife.h>
19 #include <net/tc_act/tc_ife.h>
20 
21 static int skbtcindex_encode(struct sk_buff *skb, void *skbdata,
22 			     struct tcf_meta_info *e)
23 {
24 	u32 ifetc_index = skb->tc_index;
25 
26 	return ife_encode_meta_u16(ifetc_index, skbdata, e);
27 }
28 
29 static int skbtcindex_decode(struct sk_buff *skb, void *data, u16 len)
30 {
31 	u16 ifetc_index = *(u16 *)data;
32 
33 	skb->tc_index = ntohs(ifetc_index);
34 	return 0;
35 }
36 
37 static int skbtcindex_check(struct sk_buff *skb, struct tcf_meta_info *e)
38 {
39 	return ife_check_meta_u16(skb->tc_index, e);
40 }
41 
42 static struct tcf_meta_ops ife_skbtcindex_ops = {
43 	.metaid = IFE_META_TCINDEX,
44 	.metatype = NLA_U16,
45 	.name = "tc_index",
46 	.synopsis = "skb tc_index 16 bit metadata",
47 	.check_presence = skbtcindex_check,
48 	.encode = skbtcindex_encode,
49 	.decode = skbtcindex_decode,
50 	.get = ife_get_meta_u16,
51 	.alloc = ife_alloc_meta_u16,
52 	.release = ife_release_meta_gen,
53 	.validate = ife_validate_meta_u16,
54 	.owner = THIS_MODULE,
55 };
56 
57 static int __init ifetc_index_init_module(void)
58 {
59 	return register_ife_op(&ife_skbtcindex_ops);
60 }
61 
62 static void __exit ifetc_index_cleanup_module(void)
63 {
64 	unregister_ife_op(&ife_skbtcindex_ops);
65 }
66 
67 module_init(ifetc_index_init_module);
68 module_exit(ifetc_index_cleanup_module);
69 
70 MODULE_AUTHOR("Jamal Hadi Salim(2016)");
71 MODULE_DESCRIPTION("Inter-FE skb tc_index metadata module");
72 MODULE_LICENSE("GPL");
73 MODULE_ALIAS_IFE_META("tcindex");
74