linux/net/sched/act_meta_skbprio.c
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   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