[linux-2.6-block.git] / net / sched / em_ipset.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * net/sched/em_ipset.c	ipset ematch
 *
 * Copyright (c) 2012 Florian Westphal <fw@strlen.de>
 */

#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 net *net, void *data, int data_len,
			   struct tcf_ematch *em)
{
	struct xt_set_info *set = data;
	ip_set_id_t index;

	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_ematch *em)
{
	const struct xt_set_info *set = (const void *) em->data;
	if (set) {
		ip_set_nfnl_put(em->net, 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;
	struct nf_hook_state state = {
		.net	= em->net,
	};
	int ret, network_offset;

	switch (skb_protocol(skb, true)) {
	case htons(ETH_P_IP):
		state.pf = NFPROTO_IPV4;
		if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
			return 0;
		acpar.thoff = ip_hdrlen(skb);
		break;
	case htons(ETH_P_IPV6):
		state.pf = 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;
	}

	opt.family = state.pf;
	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 (skb->skb_iif)
		indev = dev_get_by_index_rcu(em->net, skb->skb_iif);

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

	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
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
6d4fa852 FW	2	/*
	3	* net/sched/em_ipset.c ipset ematch
	4	*
	5	* Copyright (c) 2012 Florian Westphal <fw@strlen.de>
6d4fa852 FW	6	*/
	7
	8	#include <linux/gfp.h>
	9	#include <linux/module.h>
	10	#include <linux/types.h>
	11	#include <linux/kernel.h>
	12	#include <linux/string.h>
	13	#include <linux/skbuff.h>
	14	#include <linux/netfilter/xt_set.h>
	15	#include <linux/ipv6.h>
	16	#include <net/ip.h>
	17	#include <net/pkt_cls.h>
	18
82a470f1	19	static int em_ipset_change(struct net net, void data, int data_len,
6d4fa852 FW	20	struct tcf_ematch *em)
	21	{
	22	struct xt_set_info *set = data;
	23	ip_set_id_t index;
	24
	25	if (data_len != sizeof(*set))
	26	return -EINVAL;
	27
1785e8f4	28	index = ip_set_nfnl_get_byindex(net, set->index);
6d4fa852 FW	29	if (index == IPSET_INVALID_ID)
	30	return -ENOENT;
	31
	32	em->datalen = sizeof(*set);
	33	em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL);
	34	if (em->data)
	35	return 0;
	36
1785e8f4	37	ip_set_nfnl_put(net, index);
6d4fa852 FW	38	return -ENOMEM;
	39	}
	40
82a470f1	41	static void em_ipset_destroy(struct tcf_ematch *em)
6d4fa852 FW	42	{
	43	const struct xt_set_info set = (const void ) em->data;
	44	if (set) {
82a470f1	45	ip_set_nfnl_put(em->net, set->index);
6d4fa852 FW	46	kfree((void *) em->data);
	47	}
	48	}
	49
	50	static int em_ipset_match(struct sk_buff skb, struct tcf_ematch em,
	51	struct tcf_pkt_info *info)
	52	{
	53	struct ip_set_adt_opt opt;
	54	struct xt_action_param acpar;
	55	const struct xt_set_info set = (const void ) em->data;
	56	struct net_device dev, indev = NULL;
613dbd95 PNA	57	struct nf_hook_state state = {
	58	.net = em->net,
	59	};
6d4fa852 FW	60	int ret, network_offset;
6d4fa852 FW	61
d7bf2ebe	62	switch (skb_protocol(skb, true)) {
6d4fa852	63	case htons(ETH_P_IP):
613dbd95	64	state.pf = NFPROTO_IPV4;
6d4fa852 FW	65	if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
	66	return 0;
	67	acpar.thoff = ip_hdrlen(skb);
	68	break;
	69	case htons(ETH_P_IPV6):
613dbd95	70	state.pf = NFPROTO_IPV6;
6d4fa852 FW	71	if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
	72	return 0;
	73	/* doesn't call ipv6_find_hdr() because ipset doesn't use thoff, yet */
	74	acpar.thoff = sizeof(struct ipv6hdr);
	75	break;
	76	default:
	77	return 0;
	78	}
	79
613dbd95	80	opt.family = state.pf;
6d4fa852 FW	81	opt.dim = set->dim;
	82	opt.flags = set->flags;
	83	opt.cmdflags = 0;
075e64c0	84	opt.ext.timeout = ~0u;
6d4fa852 FW	85
	86	network_offset = skb_network_offset(skb);
	87	skb_pull(skb, network_offset);
	88
	89	dev = skb->dev;
	90
	91	rcu_read_lock();
	92
17cebfd0 EB	93	if (skb->skb_iif)
17cebfd0 EB	94	indev = dev_get_by_index_rcu(em->net, skb->skb_iif);
6d4fa852	95
613dbd95 PNA	96	state.in = indev ? indev : dev;
	97	state.out = dev;
	98	acpar.state = &state;
6d4fa852 FW	99
	100	ret = ip_set_test(set->index, skb, &acpar, &opt);
	101
	102	rcu_read_unlock();
	103
	104	skb_push(skb, network_offset);
	105	return ret;
	106	}
	107
	108	static struct tcf_ematch_ops em_ipset_ops = {
	109	.kind = TCF_EM_IPSET,
	110	.change = em_ipset_change,
	111	.destroy = em_ipset_destroy,
	112	.match = em_ipset_match,
	113	.owner = THIS_MODULE,
	114	.link = LIST_HEAD_INIT(em_ipset_ops.link)
	115	};
	116
	117	static int __init init_em_ipset(void)
	118	{
	119	return tcf_em_register(&em_ipset_ops);
	120	}
	121
	122	static void __exit exit_em_ipset(void)
	123	{
	124	tcf_em_unregister(&em_ipset_ops);
	125	}
	126
	127	MODULE_LICENSE("GPL");
	128	MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
	129	MODULE_DESCRIPTION("TC extended match for IP sets");
	130
	131	module_init(init_em_ipset);
	132	module_exit(exit_em_ipset);
	133
	134	MODULE_ALIAS_TCF_EMATCH(TCF_EM_IPSET);