net/sched/act_meta_skbprio.c

   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("skbprio");