[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / net / bridge / netfilter / nft_reject_bridge.c

/*
 * Copyright (c) 2014 Pablo Neira Ayuso <pablo@netfilter.org>
 *
 * 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/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nft_reject.h>
#include <net/netfilter/ipv4/nf_reject.h>
#include <net/netfilter/ipv6/nf_reject.h>

static void nft_reject_bridge_eval(const struct nft_expr *expr,
				 struct nft_data data[NFT_REG_MAX + 1],
				 const struct nft_pktinfo *pkt)
{
	struct nft_reject *priv = nft_expr_priv(expr);
	struct net *net = dev_net((pkt->in != NULL) ? pkt->in : pkt->out);

	switch (eth_hdr(pkt->skb)->h_proto) {
	case htons(ETH_P_IP):
		switch (priv->type) {
		case NFT_REJECT_ICMP_UNREACH:
			nf_send_unreach(pkt->skb, priv->icmp_code);
			break;
		case NFT_REJECT_TCP_RST:
			nf_send_reset(pkt->skb, pkt->ops->hooknum);
			break;
		case NFT_REJECT_ICMPX_UNREACH:
			nf_send_unreach(pkt->skb,
					nft_reject_icmp_code(priv->icmp_code));
			break;
		}
		break;
	case htons(ETH_P_IPV6):
		switch (priv->type) {
		case NFT_REJECT_ICMP_UNREACH:
			nf_send_unreach6(net, pkt->skb, priv->icmp_code,
					 pkt->ops->hooknum);
			break;
		case NFT_REJECT_TCP_RST:
			nf_send_reset6(net, pkt->skb, pkt->ops->hooknum);
			break;
		case NFT_REJECT_ICMPX_UNREACH:
			nf_send_unreach6(net, pkt->skb,
					 nft_reject_icmpv6_code(priv->icmp_code),
					 pkt->ops->hooknum);
			break;
		}
		break;
	default:
		/* No explicit way to reject this protocol, drop it. */
		break;
	}
	data[NFT_REG_VERDICT].verdict = NF_DROP;
}

static int nft_reject_bridge_init(const struct nft_ctx *ctx,
				  const struct nft_expr *expr,
				  const struct nlattr * const tb[])
{
	struct nft_reject *priv = nft_expr_priv(expr);
	int icmp_code;

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

	priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
	switch (priv->type) {
	case NFT_REJECT_ICMP_UNREACH:
	case NFT_REJECT_ICMPX_UNREACH:
		if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
			return -EINVAL;

		icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
		if (priv->type == NFT_REJECT_ICMPX_UNREACH &&
		    icmp_code > NFT_REJECT_ICMPX_MAX)
			return -EINVAL;

		priv->icmp_code = icmp_code;
		break;
	case NFT_REJECT_TCP_RST:
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int nft_reject_bridge_dump(struct sk_buff *skb,
				  const struct nft_expr *expr)
{
	const struct nft_reject *priv = nft_expr_priv(expr);

	if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
		goto nla_put_failure;

	switch (priv->type) {
	case NFT_REJECT_ICMP_UNREACH:
	case NFT_REJECT_ICMPX_UNREACH:
		if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
			goto nla_put_failure;
		break;
	}

	return 0;

nla_put_failure:
	return -1;
}

static struct nft_expr_type nft_reject_bridge_type;
static const struct nft_expr_ops nft_reject_bridge_ops = {
	.type		= &nft_reject_bridge_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_reject)),
	.eval		= nft_reject_bridge_eval,
	.init		= nft_reject_bridge_init,
	.dump		= nft_reject_bridge_dump,
};

static struct nft_expr_type nft_reject_bridge_type __read_mostly = {
	.family		= NFPROTO_BRIDGE,
	.name		= "reject",
	.ops		= &nft_reject_bridge_ops,
	.policy		= nft_reject_policy,
	.maxattr	= NFTA_REJECT_MAX,
	.owner		= THIS_MODULE,
};

static int __init nft_reject_bridge_module_init(void)
{
	return nft_register_expr(&nft_reject_bridge_type);
}

static void __exit nft_reject_bridge_module_exit(void)
{
	nft_unregister_expr(&nft_reject_bridge_type);
}

module_init(nft_reject_bridge_module_init);
module_exit(nft_reject_bridge_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "reject");
Commit	Line	Data
85f5b308 PNA	1	/*
	2	* Copyright (c) 2014 Pablo Neira Ayuso <pablo@netfilter.org>
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8
	9	#include <linux/kernel.h>
	10	#include <linux/init.h>
	11	#include <linux/module.h>
	12	#include <linux/netlink.h>
	13	#include <linux/netfilter.h>
	14	#include <linux/netfilter/nf_tables.h>
	15	#include <net/netfilter/nf_tables.h>
	16	#include <net/netfilter/nft_reject.h>
51b0a5d8 PNA	17	#include <net/netfilter/ipv4/nf_reject.h>
51b0a5d8 PNA	18	#include <net/netfilter/ipv6/nf_reject.h>
85f5b308 PNA	19
	20	static void nft_reject_bridge_eval(const struct nft_expr *expr,
	21	struct nft_data data[NFT_REG_MAX + 1],
	22	const struct nft_pktinfo *pkt)
	23	{
51b0a5d8 PNA	24	struct nft_reject *priv = nft_expr_priv(expr);
	25	struct net *net = dev_net((pkt->in != NULL) ? pkt->in : pkt->out);
	26
85f5b308 PNA	27	switch (eth_hdr(pkt->skb)->h_proto) {
85f5b308 PNA	28	case htons(ETH_P_IP):
51b0a5d8 PNA	29	switch (priv->type) {
	30	case NFT_REJECT_ICMP_UNREACH:
	31	nf_send_unreach(pkt->skb, priv->icmp_code);
	32	break;
	33	case NFT_REJECT_TCP_RST:
	34	nf_send_reset(pkt->skb, pkt->ops->hooknum);
	35	break;
	36	case NFT_REJECT_ICMPX_UNREACH:
	37	nf_send_unreach(pkt->skb,
	38	nft_reject_icmp_code(priv->icmp_code));
	39	break;
	40	}
	41	break;
85f5b308	42	case htons(ETH_P_IPV6):
51b0a5d8 PNA	43	switch (priv->type) {
	44	case NFT_REJECT_ICMP_UNREACH:
	45	nf_send_unreach6(net, pkt->skb, priv->icmp_code,
	46	pkt->ops->hooknum);
	47	break;
	48	case NFT_REJECT_TCP_RST:
	49	nf_send_reset6(net, pkt->skb, pkt->ops->hooknum);
	50	break;
	51	case NFT_REJECT_ICMPX_UNREACH:
	52	nf_send_unreach6(net, pkt->skb,
	53	nft_reject_icmpv6_code(priv->icmp_code),
	54	pkt->ops->hooknum);
	55	break;
	56	}
	57	break;
85f5b308 PNA	58	default:
85f5b308 PNA	59	/* No explicit way to reject this protocol, drop it. */
85f5b308 PNA	60	break;
85f5b308 PNA	61	}
51b0a5d8 PNA	62	data[NFT_REG_VERDICT].verdict = NF_DROP;
	63	}
	64
	65	static int nft_reject_bridge_init(const struct nft_ctx *ctx,
	66	const struct nft_expr *expr,
	67	const struct nlattr * const tb[])
	68	{
	69	struct nft_reject *priv = nft_expr_priv(expr);
	70	int icmp_code;
	71
	72	if (tb[NFTA_REJECT_TYPE] == NULL)
	73	return -EINVAL;
	74
	75	priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
	76	switch (priv->type) {
	77	case NFT_REJECT_ICMP_UNREACH:
	78	case NFT_REJECT_ICMPX_UNREACH:
	79	if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
	80	return -EINVAL;
	81
	82	icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
	83	if (priv->type == NFT_REJECT_ICMPX_UNREACH &&
	84	icmp_code > NFT_REJECT_ICMPX_MAX)
	85	return -EINVAL;
	86
	87	priv->icmp_code = icmp_code;
	88	break;
	89	case NFT_REJECT_TCP_RST:
	90	break;
	91	default:
	92	return -EINVAL;
	93	}
	94	return 0;
	95	}
	96
	97	static int nft_reject_bridge_dump(struct sk_buff *skb,
	98	const struct nft_expr *expr)
	99	{
	100	const struct nft_reject *priv = nft_expr_priv(expr);
	101
	102	if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
	103	goto nla_put_failure;
	104
	105	switch (priv->type) {
	106	case NFT_REJECT_ICMP_UNREACH:
	107	case NFT_REJECT_ICMPX_UNREACH:
	108	if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
	109	goto nla_put_failure;
	110	break;
	111	}
	112
	113	return 0;
	114
	115	nla_put_failure:
	116	return -1;
85f5b308 PNA	117	}
	118
	119	static struct nft_expr_type nft_reject_bridge_type;
	120	static const struct nft_expr_ops nft_reject_bridge_ops = {
	121	.type = &nft_reject_bridge_type,
	122	.size = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
	123	.eval = nft_reject_bridge_eval,
51b0a5d8 PNA	124	.init = nft_reject_bridge_init,
51b0a5d8 PNA	125	.dump = nft_reject_bridge_dump,
85f5b308 PNA	126	};
	127
	128	static struct nft_expr_type nft_reject_bridge_type __read_mostly = {
	129	.family = NFPROTO_BRIDGE,
	130	.name = "reject",
	131	.ops = &nft_reject_bridge_ops,
	132	.policy = nft_reject_policy,
	133	.maxattr = NFTA_REJECT_MAX,
	134	.owner = THIS_MODULE,
	135	};
	136
	137	static int __init nft_reject_bridge_module_init(void)
	138	{
	139	return nft_register_expr(&nft_reject_bridge_type);
	140	}
	141
	142	static void __exit nft_reject_bridge_module_exit(void)
	143	{
	144	nft_unregister_expr(&nft_reject_bridge_type);
	145	}
	146
	147	module_init(nft_reject_bridge_module_init);
	148	module_exit(nft_reject_bridge_module_exit);
	149
	150	MODULE_LICENSE("GPL");
	151	MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
	152	MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "reject");