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(metaval: skb->priority, mi: 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(metaval: ifeprio, skbdata, mi: 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(mops: &ife_prio_ops);
58}
59
60static void __exit ifeprio_cleanup_module(void)
61{
62 unregister_ife_op(mops: &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

source code of linux/net/sched/act_meta_skbprio.c