1 /*
2 * net/sched/act_meta_prio.c IFE skb->priority metadata module
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * copyright Jamal Hadi Salim (2015)
10 *
11 */
12
13 #include <linux/types.h>
14 #include <linux/kernel.h>
15 #include <linux/string.h>
16 #include <linux/errno.h>
17 #include <linux/skbuff.h>
18 #include <linux/rtnetlink.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <net/netlink.h>
22 #include <net/pkt_sched.h>
23 #include <uapi/linux/tc_act/tc_ife.h>
24 #include <net/tc_act/tc_ife.h>
25
26 static int skbprio_check(struct sk_buff *skb, struct tcf_meta_info *e)
27 {
28 return ife_check_meta_u32(skb->priority, e);
29 }
30
31 static int skbprio_encode(struct sk_buff *skb, void *skbdata,
32 struct tcf_meta_info *e)
33 {
34 u32 ifeprio = skb->priority; /* avoid having to cast skb->priority*/
35
36 return ife_encode_meta_u32(ifeprio, skbdata, e);
37 }
38
39 static int skbprio_decode(struct sk_buff *skb, void *data, u16 len)
40 {
41 u32 ifeprio = *(u32 *)data;
42
43 skb->priority = ntohl(ifeprio);
44 return 0;
45 }
46
47 static struct tcf_meta_ops ife_prio_ops = {
48 .metaid = IFE_META_PRIO,
49 .metatype = NLA_U32,
50 .name = "skbprio",
51 .synopsis = "skb prio metadata",
52 .check_presence = skbprio_check,
53 .encode = skbprio_encode,
54 .decode = skbprio_decode,
55 .get = ife_get_meta_u32,
56 .alloc = ife_alloc_meta_u32,
57 .owner = THIS_MODULE,
58 };
59
60 static int __init ifeprio_init_module(void)
61 {
62 return register_ife_op(&ife_prio_ops);
63 }
64
65 static void __exit ifeprio_cleanup_module(void)
66 {
67 unregister_ife_op(&ife_prio_ops);
68 }
69
70 module_init(ifeprio_init_module);
71 module_exit(ifeprio_cleanup_module);
72
73 MODULE_AUTHOR("Jamal Hadi Salim(2015)");
74 MODULE_DESCRIPTION("Inter-FE skb prio metadata action");
75 MODULE_LICENSE("GPL");
76 MODULE_ALIAS_IFE_META(IFE_META_PRIO);
77
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