LXR linux/net/sched/act_meta

   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
  26static int skbprio_check(struct sk_buff *skb, struct tcf_meta_info *e)
  27{
  28        return ife_check_meta_u32(skb->priority, e);
  29}
  30
  31static 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
  39static 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
  47static 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
  60static int __init ifeprio_init_module(void)
  61{
  62        return register_ife_op(&ife_prio_ops);
  63}
  64
  65static void __exit ifeprio_cleanup_module(void)
  66{
  67        unregister_ife_op(&ife_prio_ops);
  68}
  69
  70module_init(ifeprio_init_module);
  71module_exit(ifeprio_cleanup_module);
  72
  73MODULE_AUTHOR("Jamal Hadi Salim(2015)");
  74MODULE_DESCRIPTION("Inter-FE skb prio metadata action");
  75MODULE_LICENSE("GPL");
  76MODULE_ALIAS_IFE_META(IFE_META_PRIO);
  77