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Commit 408fbc22 authored by Jamal Hadi Salim's avatar Jamal Hadi Salim Committed by David S. Miller
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net sched ife action: Introduce skb tcindex metadata encap decap 



Sample use case of how this is encoded:
user space via tuntap (or a connected VM/Machine/container)
encodes the tcindex TLV.

Sample use case of decoding:
IFE action decodes it and the skb->tc_index is then used to classify.
So something like this for encoded ICMP packets:

.. first decode then reclassify... skb->tcindex will be set
sudo $TC filter add dev $ETH parent ffff: prio 2 protocol 0xbeef \
u32 match u32 0 0 flowid 1:1 \
action ife decode reclassify

...next match the decode icmp packet...
sudo $TC filter add dev $ETH parent ffff: prio 4 protocol ip \
u32 match ip protocol 1 0xff flowid 1:1 \
action continue

... last classify it using the tcindex classifier and do someaction..
sudo $TC filter add dev $ETH parent ffff: prio 5 protocol ip \
handle 0x11 tcindex classid 1:1 \
action blah..

Signed-off-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6a5d58b6

include/uapi/linux/tc_act/tc_ife.h

+2 −1
Original line number Diff line number Diff line
@@ -32,8 +32,9 @@ enum { 
#define IFE_META_HASHID 2

#define	IFE_META_PRIO 3

#define	IFE_META_QMAP 4

#define	IFE_META_TCINDEX 5

/*Can be overridden at runtime by module option*/

#define	__IFE_META_MAX 5

#define	__IFE_META_MAX 6

#define IFE_META_MAX (__IFE_META_MAX - 1)



#endif

net/sched/Kconfig

+5 −0
Original line number Diff line number Diff line
@@ -793,6 +793,11 @@ config NET_IFE_SKBPRIO 
        depends on NET_ACT_IFE

        ---help---



config NET_IFE_SKBTCINDEX

        tristate "Support to encoding decoding skb tcindex on IFE action"

        depends on NET_ACT_IFE

        ---help---



config NET_CLS_IND

	bool "Incoming device classification"

	depends on NET_CLS_U32 || NET_CLS_FW

net/sched/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ obj-$(CONFIG_NET_ACT_SKBMOD) += act_skbmod.o 
obj-$(CONFIG_NET_ACT_IFE)	+= act_ife.o

obj-$(CONFIG_NET_IFE_SKBMARK)	+= act_meta_mark.o

obj-$(CONFIG_NET_IFE_SKBPRIO)	+= act_meta_skbprio.o

obj-$(CONFIG_NET_IFE_SKBTCINDEX)	+= act_meta_skbtcindex.o

obj-$(CONFIG_NET_ACT_TUNNEL_KEY)+= act_tunnel_key.o

obj-$(CONFIG_NET_SCH_FIFO)	+= sch_fifo.o

obj-$(CONFIG_NET_SCH_CBQ)	+= sch_cbq.o

net/sched/act_meta_skbtcindex.c

0 → 100644
+79 −0
Original line number Diff line number Diff line 
/*

 * net/sched/act_meta_tc_index.c IFE skb->tc_index metadata module

 *

 *		This program is free software; you can redistribute it and/or

 *		modify it under the terms of the GNU General Public License

 *		as published by the Free Software Foundation; either version

 *		2 of the License, or (at your option) any later version.

 *

 * copyright Jamal Hadi Salim (2016)

 *

*/



#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/string.h>

#include <linux/errno.h>

#include <linux/skbuff.h>

#include <linux/rtnetlink.h>

#include <linux/module.h>

#include <linux/init.h>

#include <net/netlink.h>

#include <net/pkt_sched.h>

#include <uapi/linux/tc_act/tc_ife.h>

#include <net/tc_act/tc_ife.h>

#include <linux/rtnetlink.h>



static int skbtcindex_encode(struct sk_buff *skb, void *skbdata,

			     struct tcf_meta_info *e)

{

	u32 ifetc_index = skb->tc_index;



	return ife_encode_meta_u16(ifetc_index, skbdata, e);

}



static int skbtcindex_decode(struct sk_buff *skb, void *data, u16 len)

{

	u16 ifetc_index = *(u16 *)data;



	skb->tc_index = ntohs(ifetc_index);

	return 0;

}



static int skbtcindex_check(struct sk_buff *skb, struct tcf_meta_info *e)

{

	return ife_check_meta_u16(skb->tc_index, e);

}



static struct tcf_meta_ops ife_skbtcindex_ops = {

	.metaid = IFE_META_TCINDEX,

	.metatype = NLA_U16,

	.name = "tc_index",

	.synopsis = "skb tc_index 16 bit metadata",

	.check_presence = skbtcindex_check,

	.encode = skbtcindex_encode,

	.decode = skbtcindex_decode,

	.get = ife_get_meta_u16,

	.alloc = ife_alloc_meta_u16,

	.release = ife_release_meta_gen,

	.validate = ife_validate_meta_u16,

	.owner = THIS_MODULE,

};



static int __init ifetc_index_init_module(void)

{

	return register_ife_op(&ife_skbtcindex_ops);

}



static void __exit ifetc_index_cleanup_module(void)

{

	unregister_ife_op(&ife_skbtcindex_ops);

}



module_init(ifetc_index_init_module);

module_exit(ifetc_index_cleanup_module);



MODULE_AUTHOR("Jamal Hadi Salim(2016)");

MODULE_DESCRIPTION("Inter-FE skb tc_index metadata module");

MODULE_LICENSE("GPL");

MODULE_ALIAS_IFE_META(IFE_META_SKBTCINDEX);