net/sched/act_meta_skbtcindex.c

   1 /*
   2  * net/sched/act_meta_tc_index.c IFE skb->tc_index 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 (2016)
  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 skbtcindex_encode(struct sk_buff *skb, void *skbdata,
  27                              struct tcf_meta_info *e)
  28 {
  29         u32 ifetc_index = skb->tc_index;
  30
  31         return ife_encode_meta_u16(ifetc_index, skbdata, e);
  32 }
  33
  34 static int skbtcindex_decode(struct sk_buff *skb, void *data, u16 len)
  35 {
  36         u16 ifetc_index = *(u16 *)data;
  37
  38         skb->tc_index = ntohs(ifetc_index);
  39         return 0;
  40 }
  41
  42 static int skbtcindex_check(struct sk_buff *skb, struct tcf_meta_info *e)
  43 {
  44         return ife_check_meta_u16(skb->tc_index, e);
  45 }
  46
  47 static struct tcf_meta_ops ife_skbtcindex_ops = {
  48         .metaid = IFE_META_TCINDEX,
  49         .metatype = NLA_U16,
  50         .name = "tc_index",
  51         .synopsis = "skb tc_index 16 bit metadata",
  52         .check_presence = skbtcindex_check,
  53         .encode = skbtcindex_encode,
  54         .decode = skbtcindex_decode,
  55         .get = ife_get_meta_u16,
  56         .alloc = ife_alloc_meta_u16,
  57         .release = ife_release_meta_gen,
  58         .validate = ife_validate_meta_u16,
  59         .owner = THIS_MODULE,
  60 };
  61
  62 static int __init ifetc_index_init_module(void)
  63 {
  64         return register_ife_op(&ife_skbtcindex_ops);
  65 }
  66
  67 static void __exit ifetc_index_cleanup_module(void)
  68 {
  69         unregister_ife_op(&ife_skbtcindex_ops);
  70 }
  71
  72 module_init(ifetc_index_init_module);
  73 module_exit(ifetc_index_cleanup_module);
  74
  75 MODULE_AUTHOR("Jamal Hadi Salim(2016)");
  76 MODULE_DESCRIPTION("Inter-FE skb tc_index metadata module");
  77 MODULE_LICENSE("GPL");
  78 MODULE_ALIAS_IFE_META("tcindex");