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(IFE_META_PRIO); 77