net/sched/act_meta_skbprio.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * net/sched/act_meta_prio.c IFE skb->priority metadata module
0004  *
0005  * copyright Jamal Hadi Salim (2015)
0006 */
0007
0008 #include <linux/types.h>
0009 #include <linux/kernel.h>
0010 #include <linux/string.h>
0011 #include <linux/errno.h>
0012 #include <linux/skbuff.h>
0013 #include <linux/rtnetlink.h>
0014 #include <linux/module.h>
0015 #include <linux/init.h>
0016 #include <net/netlink.h>
0017 #include <net/pkt_sched.h>
0018 #include <uapi/linux/tc_act/tc_ife.h>
0019 #include <net/tc_act/tc_ife.h>
0020
0021 static int skbprio_check(struct sk_buff *skb, struct tcf_meta_info *e)
0022 {
0023     return ife_check_meta_u32(skb->priority, e);
0024 }
0025
0026 static int skbprio_encode(struct sk_buff *skb, void *skbdata,
0027               struct tcf_meta_info *e)
0028 {
0029     u32 ifeprio = skb->priority; /* avoid having to cast skb->priority*/
0030
0031     return ife_encode_meta_u32(ifeprio, skbdata, e);
0032 }
0033
0034 static int skbprio_decode(struct sk_buff *skb, void *data, u16 len)
0035 {
0036     u32 ifeprio = *(u32 *)data;
0037
0038     skb->priority = ntohl(ifeprio);
0039     return 0;
0040 }
0041
0042 static struct tcf_meta_ops ife_prio_ops = {
0043     .metaid = IFE_META_PRIO,
0044     .metatype = NLA_U32,
0045     .name = "skbprio",
0046     .synopsis = "skb prio metadata",
0047     .check_presence = skbprio_check,
0048     .encode = skbprio_encode,
0049     .decode = skbprio_decode,
0050     .get = ife_get_meta_u32,
0051     .alloc = ife_alloc_meta_u32,
0052     .owner = THIS_MODULE,
0053 };
0054
0055 static int __init ifeprio_init_module(void)
0056 {
0057     return register_ife_op(&ife_prio_ops);
0058 }
0059
0060 static void __exit ifeprio_cleanup_module(void)
0061 {
0062     unregister_ife_op(&ife_prio_ops);
0063 }
0064
0065 module_init(ifeprio_init_module);
0066 module_exit(ifeprio_cleanup_module);
0067
0068 MODULE_AUTHOR("Jamal Hadi Salim(2015)");
0069 MODULE_DESCRIPTION("Inter-FE skb prio metadata action");
0070 MODULE_LICENSE("GPL");
0071 MODULE_ALIAS_IFE_META("skbprio");