net/sched/act_skbedit.c - third_party/linux - Git at Google

 /*
  * Copyright (c) 2008, Intel Corporation.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License along with
  * this program; if not, see <http://www.gnu.org/licenses/>.
  *
  * Author: Alexander Duyck <alexander.h.duyck@intel.com>
  */

 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/skbuff.h>
 #include <linux/rtnetlink.h>
 #include <net/netlink.h>
 #include <net/pkt_sched.h>

 #include <linux/tc_act/tc_skbedit.h>
 #include <net/tc_act/tc_skbedit.h>

 #define SKBEDIT_TAB_MASK     15

 static unsigned int skbedit_net_id;
 static struct tc_action_ops act_skbedit_ops;

 static int tcf_skbedit(struct sk_buff *skb, const struct tc_action *a,
 		       struct tcf_result *res)
 {
 	struct tcf_skbedit *d = to_skbedit(a);

 	spin_lock(&d->tcf_lock);
 	tcf_lastuse_update(&d->tcf_tm);
 	bstats_update(&d->tcf_bstats, skb);

 	if (d->flags & SKBEDIT_F_PRIORITY)
 		skb->priority = d->priority;
 	if (d->flags & SKBEDIT_F_QUEUE_MAPPING &&
 	    skb->dev->real_num_tx_queues > d->queue_mapping)
 		skb_set_queue_mapping(skb, d->queue_mapping);
 	if (d->flags & SKBEDIT_F_MARK) {
 		skb->mark &= ~d->mask;
 		skb->mark |= d->mark & d->mask;
 	}
 	if (d->flags & SKBEDIT_F_PTYPE)
 		skb->pkt_type = d->ptype;

 	spin_unlock(&d->tcf_lock);
 	return d->tcf_action;
 }

 static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
 	[TCA_SKBEDIT_PARMS]		= { .len = sizeof(struct tc_skbedit) },
 	[TCA_SKBEDIT_PRIORITY]		= { .len = sizeof(u32) },
 	[TCA_SKBEDIT_QUEUE_MAPPING]	= { .len = sizeof(u16) },
 	[TCA_SKBEDIT_MARK]		= { .len = sizeof(u32) },
 	[TCA_SKBEDIT_PTYPE]		= { .len = sizeof(u16) },
 	[TCA_SKBEDIT_MASK]		= { .len = sizeof(u32) },
 };

 static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
 			    struct nlattr *est, struct tc_action **a,
 			    int ovr, int bind)
 {
 	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
 	struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
 	struct tc_skbedit *parm;
 	struct tcf_skbedit *d;
 	u32 flags = 0, *priority = NULL, *mark = NULL, *mask = NULL;
 	u16 *queue_mapping = NULL, *ptype = NULL;
 	bool exists = false;
 	int ret = 0, err;

 	if (nla == NULL)
 		return -EINVAL;

 	err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy);
 	if (err < 0)
 		return err;

 	if (tb[TCA_SKBEDIT_PARMS] == NULL)
 		return -EINVAL;

 	if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
 		flags |= SKBEDIT_F_PRIORITY;
 		priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
 	}

 	if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
 		flags |= SKBEDIT_F_QUEUE_MAPPING;
 		queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
 	}

 	if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
 		ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
 		if (!skb_pkt_type_ok(*ptype))
 			return -EINVAL;
 		flags |= SKBEDIT_F_PTYPE;
 	}

 	if (tb[TCA_SKBEDIT_MARK] != NULL) {
 		flags |= SKBEDIT_F_MARK;
 		mark = nla_data(tb[TCA_SKBEDIT_MARK]);
 	}

 	if (tb[TCA_SKBEDIT_MASK] != NULL) {
 		flags |= SKBEDIT_F_MASK;
 		mask = nla_data(tb[TCA_SKBEDIT_MASK]);
 	}

 	parm = nla_data(tb[TCA_SKBEDIT_PARMS]);

 	exists = tcf_hash_check(tn, parm->index, a, bind);
 	if (exists && bind)
 		return 0;

 	if (!flags) {
 		tcf_hash_release(*a, bind);
 		return -EINVAL;
 	}

 	if (!exists) {
 		ret = tcf_hash_create(tn, parm->index, est, a,
 				      &act_skbedit_ops, bind, false);
 		if (ret)
 			return ret;

 		d = to_skbedit(*a);
 		ret = ACT_P_CREATED;
 	} else {
 		d = to_skbedit(*a);
 		tcf_hash_release(*a, bind);
 		if (!ovr)
 			return -EEXIST;
 	}

 	spin_lock_bh(&d->tcf_lock);

 	d->flags = flags;
 	if (flags & SKBEDIT_F_PRIORITY)
 		d->priority = *priority;
 	if (flags & SKBEDIT_F_QUEUE_MAPPING)
 		d->queue_mapping = *queue_mapping;
 	if (flags & SKBEDIT_F_MARK)
 		d->mark = *mark;
 	if (flags & SKBEDIT_F_PTYPE)
 		d->ptype = *ptype;
 	/* default behaviour is to use all the bits */
 	d->mask = 0xffffffff;
 	if (flags & SKBEDIT_F_MASK)
 		d->mask = *mask;

 	d->tcf_action = parm->action;

 	spin_unlock_bh(&d->tcf_lock);

 	if (ret == ACT_P_CREATED)
 		tcf_hash_insert(tn, *a);
 	return ret;
 }

 static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a,
 			    int bind, int ref)
 {
 	unsigned char *b = skb_tail_pointer(skb);
 	struct tcf_skbedit *d = to_skbedit(a);
 	struct tc_skbedit opt = {
 		.index   = d->tcf_index,
 		.refcnt  = d->tcf_refcnt - ref,
 		.bindcnt = d->tcf_bindcnt - bind,
 		.action  = d->tcf_action,
 	};
 	struct tcf_t t;

 	if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
 		goto nla_put_failure;
 	if ((d->flags & SKBEDIT_F_PRIORITY) &&
 	    nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, d->priority))
 		goto nla_put_failure;
 	if ((d->flags & SKBEDIT_F_QUEUE_MAPPING) &&
 	    nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, d->queue_mapping))
 		goto nla_put_failure;
 	if ((d->flags & SKBEDIT_F_MARK) &&
 	    nla_put_u32(skb, TCA_SKBEDIT_MARK, d->mark))
 		goto nla_put_failure;
 	if ((d->flags & SKBEDIT_F_PTYPE) &&
 	    nla_put_u16(skb, TCA_SKBEDIT_PTYPE, d->ptype))
 		goto nla_put_failure;
 	if ((d->flags & SKBEDIT_F_MASK) &&
 	    nla_put_u32(skb, TCA_SKBEDIT_MASK, d->mask))
 		goto nla_put_failure;

 	tcf_tm_dump(&t, &d->tcf_tm);
 	if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD))
 		goto nla_put_failure;
 	return skb->len;

 nla_put_failure:
 	nlmsg_trim(skb, b);
 	return -1;
 }

 static int tcf_skbedit_walker(struct net *net, struct sk_buff *skb,
 			      struct netlink_callback *cb, int type,
 			      const struct tc_action_ops *ops)
 {
 	struct tc_action_net *tn = net_generic(net, skbedit_net_id);

 	return tcf_generic_walker(tn, skb, cb, type, ops);
 }

 static int tcf_skbedit_search(struct net *net, struct tc_action **a, u32 index)
 {
 	struct tc_action_net *tn = net_generic(net, skbedit_net_id);

 	return tcf_hash_search(tn, a, index);
 }

 static struct tc_action_ops act_skbedit_ops = {
 	.kind		=	"skbedit",
 	.type		=	TCA_ACT_SKBEDIT,
 	.owner		=	THIS_MODULE,
 	.act		=	tcf_skbedit,
 	.dump		=	tcf_skbedit_dump,
 	.init		=	tcf_skbedit_init,
 	.walk		=	tcf_skbedit_walker,
 	.lookup		=	tcf_skbedit_search,
 	.size		=	sizeof(struct tcf_skbedit),
 };

 static __net_init int skbedit_init_net(struct net *net)
 {
 	struct tc_action_net *tn = net_generic(net, skbedit_net_id);

 	return tc_action_net_init(tn, &act_skbedit_ops, SKBEDIT_TAB_MASK);
 }

 static void __net_exit skbedit_exit_net(struct net *net)
 {
 	struct tc_action_net *tn = net_generic(net, skbedit_net_id);

 	tc_action_net_exit(tn);
 }

 static struct pernet_operations skbedit_net_ops = {
 	.init = skbedit_init_net,
 	.exit = skbedit_exit_net,
 	.id   = &skbedit_net_id,
 	.size = sizeof(struct tc_action_net),
 };

 MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
 MODULE_DESCRIPTION("SKB Editing");
 MODULE_LICENSE("GPL");

 static int __init skbedit_init_module(void)
 {
 	return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops);
 }

 static void __exit skbedit_cleanup_module(void)
 {
 	tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops);
 }

 module_init(skbedit_init_module);
 module_exit(skbedit_cleanup_module);
	/*
	* Copyright (c) 2008, Intel Corporation.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* You should have received a copy of the GNU General Public License along with
	* this program; if not, see <http://www.gnu.org/licenses/>.
	*
	* Author: Alexander Duyck <alexander.h.duyck@intel.com>
	*/

	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/skbuff.h>
	#include <linux/rtnetlink.h>
	#include <net/netlink.h>
	#include <net/pkt_sched.h>

	#include <linux/tc_act/tc_skbedit.h>
	#include <net/tc_act/tc_skbedit.h>

	#define SKBEDIT_TAB_MASK 15

	static unsigned int skbedit_net_id;
	static struct tc_action_ops act_skbedit_ops;

	static int tcf_skbedit(struct sk_buff skb, const struct tc_action a,
	struct tcf_result *res)
	{
	struct tcf_skbedit *d = to_skbedit(a);

	spin_lock(&d->tcf_lock);
	tcf_lastuse_update(&d->tcf_tm);
	bstats_update(&d->tcf_bstats, skb);

	if (d->flags & SKBEDIT_F_PRIORITY)
	skb->priority = d->priority;
	if (d->flags & SKBEDIT_F_QUEUE_MAPPING &&
	skb->dev->real_num_tx_queues > d->queue_mapping)
	skb_set_queue_mapping(skb, d->queue_mapping);
	if (d->flags & SKBEDIT_F_MARK) {
	skb->mark &= ~d->mask;
	skb->mark \|= d->mark & d->mask;
	}
	if (d->flags & SKBEDIT_F_PTYPE)
	skb->pkt_type = d->ptype;

	spin_unlock(&d->tcf_lock);
	return d->tcf_action;
	}

	static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
	[TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) },
	[TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) },
	[TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) },
	[TCA_SKBEDIT_MARK] = { .len = sizeof(u32) },
	[TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) },
	[TCA_SKBEDIT_MASK] = { .len = sizeof(u32) },
	};

	static int tcf_skbedit_init(struct net net, struct nlattr nla,
	struct nlattr est, struct tc_action *a,
	int ovr, int bind)
	{
	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
	struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
	struct tc_skbedit *parm;
	struct tcf_skbedit *d;
	u32 flags = 0, priority = NULL, mark = NULL, *mask = NULL;
	u16 queue_mapping = NULL, ptype = NULL;
	bool exists = false;
	int ret = 0, err;

	if (nla == NULL)
	return -EINVAL;

	err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy);
	if (err < 0)
	return err;

	if (tb[TCA_SKBEDIT_PARMS] == NULL)
	return -EINVAL;

	if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
	flags \|= SKBEDIT_F_PRIORITY;
	priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
	}

	if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
	flags \|= SKBEDIT_F_QUEUE_MAPPING;
	queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
	}

	if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
	ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
	if (!skb_pkt_type_ok(*ptype))
	return -EINVAL;
	flags \|= SKBEDIT_F_PTYPE;
	}

	if (tb[TCA_SKBEDIT_MARK] != NULL) {
	flags \|= SKBEDIT_F_MARK;
	mark = nla_data(tb[TCA_SKBEDIT_MARK]);
	}

	if (tb[TCA_SKBEDIT_MASK] != NULL) {
	flags \|= SKBEDIT_F_MASK;
	mask = nla_data(tb[TCA_SKBEDIT_MASK]);
	}

	parm = nla_data(tb[TCA_SKBEDIT_PARMS]);

	exists = tcf_hash_check(tn, parm->index, a, bind);
	if (exists && bind)
	return 0;

	if (!flags) {
	tcf_hash_release(*a, bind);
	return -EINVAL;
	}

	if (!exists) {
	ret = tcf_hash_create(tn, parm->index, est, a,
	&act_skbedit_ops, bind, false);
	if (ret)
	return ret;

	d = to_skbedit(*a);
	ret = ACT_P_CREATED;
	} else {
	d = to_skbedit(*a);
	tcf_hash_release(*a, bind);
	if (!ovr)
	return -EEXIST;
	}

	spin_lock_bh(&d->tcf_lock);

	d->flags = flags;
	if (flags & SKBEDIT_F_PRIORITY)
	d->priority = *priority;
	if (flags & SKBEDIT_F_QUEUE_MAPPING)
	d->queue_mapping = *queue_mapping;
	if (flags & SKBEDIT_F_MARK)
	d->mark = *mark;
	if (flags & SKBEDIT_F_PTYPE)
	d->ptype = *ptype;
	/* default behaviour is to use all the bits */
	d->mask = 0xffffffff;
	if (flags & SKBEDIT_F_MASK)
	d->mask = *mask;

	d->tcf_action = parm->action;

	spin_unlock_bh(&d->tcf_lock);

	if (ret == ACT_P_CREATED)
	tcf_hash_insert(tn, *a);
	return ret;
	}

	static int tcf_skbedit_dump(struct sk_buff skb, struct tc_action a,
	int bind, int ref)
	{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_skbedit *d = to_skbedit(a);
	struct tc_skbedit opt = {
	.index = d->tcf_index,
	.refcnt = d->tcf_refcnt - ref,
	.bindcnt = d->tcf_bindcnt - bind,
	.action = d->tcf_action,
	};
	struct tcf_t t;

	if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
	goto nla_put_failure;
	if ((d->flags & SKBEDIT_F_PRIORITY) &&
	nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, d->priority))
	goto nla_put_failure;
	if ((d->flags & SKBEDIT_F_QUEUE_MAPPING) &&
	nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, d->queue_mapping))
	goto nla_put_failure;
	if ((d->flags & SKBEDIT_F_MARK) &&
	nla_put_u32(skb, TCA_SKBEDIT_MARK, d->mark))
	goto nla_put_failure;
	if ((d->flags & SKBEDIT_F_PTYPE) &&
	nla_put_u16(skb, TCA_SKBEDIT_PTYPE, d->ptype))
	goto nla_put_failure;
	if ((d->flags & SKBEDIT_F_MASK) &&
	nla_put_u32(skb, TCA_SKBEDIT_MASK, d->mask))
	goto nla_put_failure;

	tcf_tm_dump(&t, &d->tcf_tm);
	if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD))
	goto nla_put_failure;
	return skb->len;

	nla_put_failure:
	nlmsg_trim(skb, b);
	return -1;
	}

	static int tcf_skbedit_walker(struct net net, struct sk_buff skb,
	struct netlink_callback *cb, int type,
	const struct tc_action_ops *ops)
	{
	struct tc_action_net *tn = net_generic(net, skbedit_net_id);

	return tcf_generic_walker(tn, skb, cb, type, ops);
	}

	static int tcf_skbedit_search(struct net net, struct tc_action *a, u32 index)
	{
	struct tc_action_net *tn = net_generic(net, skbedit_net_id);

	return tcf_hash_search(tn, a, index);
	}

	static struct tc_action_ops act_skbedit_ops = {
	.kind = "skbedit",
	.type = TCA_ACT_SKBEDIT,
	.owner = THIS_MODULE,
	.act = tcf_skbedit,
	.dump = tcf_skbedit_dump,
	.init = tcf_skbedit_init,
	.walk = tcf_skbedit_walker,
	.lookup = tcf_skbedit_search,
	.size = sizeof(struct tcf_skbedit),
	};

	static __net_init int skbedit_init_net(struct net *net)
	{
	struct tc_action_net *tn = net_generic(net, skbedit_net_id);

	return tc_action_net_init(tn, &act_skbedit_ops, SKBEDIT_TAB_MASK);
	}

	static void __net_exit skbedit_exit_net(struct net *net)
	{
	struct tc_action_net *tn = net_generic(net, skbedit_net_id);

	tc_action_net_exit(tn);
	}

	static struct pernet_operations skbedit_net_ops = {
	.init = skbedit_init_net,
	.exit = skbedit_exit_net,
	.id = &skbedit_net_id,
	.size = sizeof(struct tc_action_net),
	};

	MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
	MODULE_DESCRIPTION("SKB Editing");
	MODULE_LICENSE("GPL");

	static int __init skbedit_init_module(void)
	{
	return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops);
	}

	static void __exit skbedit_cleanup_module(void)
	{
	tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops);
	}

	module_init(skbedit_init_module);
	module_exit(skbedit_cleanup_module);