[deliverable/linux.git] / net / sched / em_ipset.c

/*
 * net/sched/em_ipset.c	ipset ematch
 *
 * Copyright (c) 2012 Florian Westphal <fw@strlen.de>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 */

#include <linux/gfp.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/netfilter/xt_set.h>
#include <linux/ipv6.h>
#include <net/ip.h>
#include <net/pkt_cls.h>

static int em_ipset_change(struct tcf_proto *tp, void *data, int data_len,
			   struct tcf_ematch *em)
{
	struct xt_set_info *set = data;
	ip_set_id_t index;
	struct net *net = dev_net(qdisc_dev(tp->q));

	if (data_len != sizeof(*set))
		return -EINVAL;

	index = ip_set_nfnl_get_byindex(net, set->index);
	if (index == IPSET_INVALID_ID)
		return -ENOENT;

	em->datalen = sizeof(*set);
	em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL);
	if (em->data)
		return 0;

	ip_set_nfnl_put(net, index);
	return -ENOMEM;
}

static void em_ipset_destroy(struct tcf_proto *p, struct tcf_ematch *em)
{
	const struct xt_set_info *set = (const void *) em->data;
	if (set) {
		ip_set_nfnl_put(dev_net(qdisc_dev(p->q)), set->index);
		kfree((void *) em->data);
	}
}

static int em_ipset_match(struct sk_buff *skb, struct tcf_ematch *em,
			  struct tcf_pkt_info *info)
{
	struct ip_set_adt_opt opt;
	struct xt_action_param acpar;
	const struct xt_set_info *set = (const void *) em->data;
	struct net_device *dev, *indev = NULL;
	int ret, network_offset;

	switch (skb->protocol) {
	case htons(ETH_P_IP):
		acpar.family = NFPROTO_IPV4;
		if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
			return 0;
		acpar.thoff = ip_hdrlen(skb);
		break;
	case htons(ETH_P_IPV6):
		acpar.family = NFPROTO_IPV6;
		if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
			return 0;
		/* doesn't call ipv6_find_hdr() because ipset doesn't use thoff, yet */
		acpar.thoff = sizeof(struct ipv6hdr);
		break;
	default:
		return 0;
	}

	acpar.hooknum = 0;

	opt.family = acpar.family;
	opt.dim = set->dim;
	opt.flags = set->flags;
	opt.cmdflags = 0;
	opt.ext.timeout = ~0u;

	network_offset = skb_network_offset(skb);
	skb_pull(skb, network_offset);

	dev = skb->dev;

	rcu_read_lock();

	if (dev && skb->skb_iif)
		indev = dev_get_by_index_rcu(dev_net(dev), skb->skb_iif);

	acpar.in      = indev ? indev : dev;
	acpar.out     = dev;

	ret = ip_set_test(set->index, skb, &acpar, &opt);

	rcu_read_unlock();

	skb_push(skb, network_offset);
	return ret;
}

static struct tcf_ematch_ops em_ipset_ops = {
	.kind	  = TCF_EM_IPSET,
	.change	  = em_ipset_change,
	.destroy  = em_ipset_destroy,
	.match	  = em_ipset_match,
	.owner	  = THIS_MODULE,
	.link	  = LIST_HEAD_INIT(em_ipset_ops.link)
};

static int __init init_em_ipset(void)
{
	return tcf_em_register(&em_ipset_ops);
}

static void __exit exit_em_ipset(void)
{
	tcf_em_unregister(&em_ipset_ops);
}

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
MODULE_DESCRIPTION("TC extended match for IP sets");

module_init(init_em_ipset);
module_exit(exit_em_ipset);

MODULE_ALIAS_TCF_EMATCH(TCF_EM_IPSET);
Commit	Line	Data
6d4fa852 FW	1	/*
	2	* net/sched/em_ipset.c ipset ematch
	3	*
	4	* Copyright (c) 2012 Florian Westphal <fw@strlen.de>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* version 2 as published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/gfp.h>
	12	#include <linux/module.h>
	13	#include <linux/types.h>
	14	#include <linux/kernel.h>
	15	#include <linux/string.h>
	16	#include <linux/skbuff.h>
	17	#include <linux/netfilter/xt_set.h>
	18	#include <linux/ipv6.h>
	19	#include <net/ip.h>
	20	#include <net/pkt_cls.h>
	21
	22	static int em_ipset_change(struct tcf_proto tp, void data, int data_len,
	23	struct tcf_ematch *em)
	24	{
	25	struct xt_set_info *set = data;
	26	ip_set_id_t index;
b1eda2ac	27	struct net *net = dev_net(qdisc_dev(tp->q));
6d4fa852 FW	28
	29	if (data_len != sizeof(*set))
	30	return -EINVAL;
	31
1785e8f4	32	index = ip_set_nfnl_get_byindex(net, set->index);
6d4fa852 FW	33	if (index == IPSET_INVALID_ID)
	34	return -ENOENT;
	35
	36	em->datalen = sizeof(*set);
	37	em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL);
	38	if (em->data)
	39	return 0;
	40
1785e8f4	41	ip_set_nfnl_put(net, index);
6d4fa852 FW	42	return -ENOMEM;
	43	}
	44
	45	static void em_ipset_destroy(struct tcf_proto p, struct tcf_ematch em)
	46	{
	47	const struct xt_set_info set = (const void ) em->data;
	48	if (set) {
b1eda2ac	49	ip_set_nfnl_put(dev_net(qdisc_dev(p->q)), set->index);
6d4fa852 FW	50	kfree((void *) em->data);
	51	}
	52	}
	53
	54	static int em_ipset_match(struct sk_buff skb, struct tcf_ematch em,
	55	struct tcf_pkt_info *info)
	56	{
	57	struct ip_set_adt_opt opt;
	58	struct xt_action_param acpar;
	59	const struct xt_set_info set = (const void ) em->data;
	60	struct net_device dev, indev = NULL;
	61	int ret, network_offset;
	62
	63	switch (skb->protocol) {
	64	case htons(ETH_P_IP):
	65	acpar.family = NFPROTO_IPV4;
	66	if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
	67	return 0;
	68	acpar.thoff = ip_hdrlen(skb);
	69	break;
	70	case htons(ETH_P_IPV6):
	71	acpar.family = NFPROTO_IPV6;
	72	if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
	73	return 0;
	74	/* doesn't call ipv6_find_hdr() because ipset doesn't use thoff, yet */
	75	acpar.thoff = sizeof(struct ipv6hdr);
	76	break;
	77	default:
	78	return 0;
	79	}
	80
	81	acpar.hooknum = 0;
	82
	83	opt.family = acpar.family;
	84	opt.dim = set->dim;
	85	opt.flags = set->flags;
	86	opt.cmdflags = 0;
075e64c0	87	opt.ext.timeout = ~0u;
6d4fa852 FW	88
	89	network_offset = skb_network_offset(skb);
	90	skb_pull(skb, network_offset);
	91
	92	dev = skb->dev;
	93
	94	rcu_read_lock();
	95
	96	if (dev && skb->skb_iif)
	97	indev = dev_get_by_index_rcu(dev_net(dev), skb->skb_iif);
	98
	99	acpar.in = indev ? indev : dev;
	100	acpar.out = dev;
	101
	102	ret = ip_set_test(set->index, skb, &acpar, &opt);
	103
	104	rcu_read_unlock();
	105
	106	skb_push(skb, network_offset);
	107	return ret;
	108	}
	109
	110	static struct tcf_ematch_ops em_ipset_ops = {
	111	.kind = TCF_EM_IPSET,
	112	.change = em_ipset_change,
	113	.destroy = em_ipset_destroy,
	114	.match = em_ipset_match,
	115	.owner = THIS_MODULE,
	116	.link = LIST_HEAD_INIT(em_ipset_ops.link)
	117	};
	118
	119	static int __init init_em_ipset(void)
	120	{
	121	return tcf_em_register(&em_ipset_ops);
	122	}
	123
	124	static void __exit exit_em_ipset(void)
	125	{
	126	tcf_em_unregister(&em_ipset_ops);
	127	}
	128
	129	MODULE_LICENSE("GPL");
	130	MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
	131	MODULE_DESCRIPTION("TC extended match for IP sets");
	132
	133	module_init(init_em_ipset);
	134	module_exit(exit_em_ipset);
	135
	136	MODULE_ALIAS_TCF_EMATCH(TCF_EM_IPSET);