1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/sched/act_meta_prio.c IFE skb->priority metadata module
4 *
5 * copyright Jamal Hadi Salim (2015)
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
21static int skbprio_check(struct sk_buff *skb, struct tcf_meta_info *e)
22{
23	return ife_check_meta_u32(skb->priority, e);
24}
25
26static int skbprio_encode(struct sk_buff *skb, void *skbdata,
27			  struct tcf_meta_info *e)
28{
29	u32 ifeprio = skb->priority; /* avoid having to cast skb->priority*/
30
31	return ife_encode_meta_u32(ifeprio, skbdata, e);
32}
33
34static int skbprio_decode(struct sk_buff *skb, void *data, u16 len)
35{
36	u32 ifeprio = *(u32 *)data;
37
38	skb->priority = ntohl(ifeprio);
39	return 0;
40}
41
42static struct tcf_meta_ops ife_prio_ops = {
43	.metaid = IFE_META_PRIO,
44	.metatype = NLA_U32,
45	.name = "skbprio",
46	.synopsis = "skb prio metadata",
47	.check_presence = skbprio_check,
48	.encode = skbprio_encode,
49	.decode = skbprio_decode,
50	.get = ife_get_meta_u32,
51	.alloc = ife_alloc_meta_u32,
52	.owner = THIS_MODULE,
53};
54
55static int __init ifeprio_init_module(void)
56{
57	return register_ife_op(&ife_prio_ops);
58}
59
60static void __exit ifeprio_cleanup_module(void)
61{
62	unregister_ife_op(&ife_prio_ops);
63}
64
65module_init(ifeprio_init_module);
66module_exit(ifeprio_cleanup_module);
67
68MODULE_AUTHOR("Jamal Hadi Salim(2015)");
69MODULE_DESCRIPTION("Inter-FE skb prio metadata action");
70MODULE_LICENSE("GPL");
71MODULE_ALIAS_IFE_META("skbprio");
72