net/sched/act_meta_skbprio.c

   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
  21 static int skbprio_check(struct sk_buff *skb, struct tcf_meta_info *e)
  22 {
  23         return ife_check_meta_u32(skb->priority, e);
  24 }
  25
  26 static 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
  34 static 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
  42 static 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
  55 static int __init ifeprio_init_module(void)
  56 {
  57         return register_ife_op(&ife_prio_ops);
  58 }
  59
  60 static void __exit ifeprio_cleanup_module(void)
  61 {
  62         unregister_ife_op(&ife_prio_ops);
  63 }
  64
  65 module_init(ifeprio_init_module);
  66 module_exit(ifeprio_cleanup_module);
  67
  68 MODULE_AUTHOR("Jamal Hadi Salim(2015)");
  69 MODULE_DESCRIPTION("Inter-FE skb prio metadata action");
  70 MODULE_LICENSE("GPL");
  71 MODULE_ALIAS_IFE_META("skbprio");