[linux-2.6-block.git] / net / netfilter / nft_log.c

/*
 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
 * Copyright (c) 2012-2014 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.
 *
 * Development of this code funded by Astaro AG (http://www.astaro.com/)
 */

#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/nf_log.h>
#include <linux/netdevice.h>

static const char *nft_log_null_prefix = "";

struct nft_log {
	struct nf_loginfo	loginfo;
	char			*prefix;
};

static void nft_log_eval(const struct nft_expr *expr,
			 struct nft_regs *regs,
			 const struct nft_pktinfo *pkt)
{
	const struct nft_log *priv = nft_expr_priv(expr);
	struct net *net = dev_net(pkt->in ? pkt->in : pkt->out);

	nf_log_packet(net, pkt->ops->pf, pkt->ops->hooknum, pkt->skb, pkt->in,
		      pkt->out, &priv->loginfo, "%s", priv->prefix);
}

static const struct nla_policy nft_log_policy[NFTA_LOG_MAX + 1] = {
	[NFTA_LOG_GROUP]	= { .type = NLA_U16 },
	[NFTA_LOG_PREFIX]	= { .type = NLA_STRING },
	[NFTA_LOG_SNAPLEN]	= { .type = NLA_U32 },
	[NFTA_LOG_QTHRESHOLD]	= { .type = NLA_U16 },
	[NFTA_LOG_LEVEL]	= { .type = NLA_U32 },
	[NFTA_LOG_FLAGS]	= { .type = NLA_U32 },
};

static int nft_log_init(const struct nft_ctx *ctx,
			const struct nft_expr *expr,
			const struct nlattr * const tb[])
{
	struct nft_log *priv = nft_expr_priv(expr);
	struct nf_loginfo *li = &priv->loginfo;
	const struct nlattr *nla;
	int ret;

	nla = tb[NFTA_LOG_PREFIX];
	if (nla != NULL) {
		priv->prefix = kmalloc(nla_len(nla) + 1, GFP_KERNEL);
		if (priv->prefix == NULL)
			return -ENOMEM;
		nla_strlcpy(priv->prefix, nla, nla_len(nla) + 1);
	} else {
		priv->prefix = (char *)nft_log_null_prefix;
	}

	li->type = NF_LOG_TYPE_LOG;
	if (tb[NFTA_LOG_LEVEL] != NULL &&
	    tb[NFTA_LOG_GROUP] != NULL)
		return -EINVAL;
	if (tb[NFTA_LOG_GROUP] != NULL)
		li->type = NF_LOG_TYPE_ULOG;

	switch (li->type) {
	case NF_LOG_TYPE_LOG:
		if (tb[NFTA_LOG_LEVEL] != NULL) {
			li->u.log.level =
				ntohl(nla_get_be32(tb[NFTA_LOG_LEVEL]));
		} else {
			li->u.log.level = LOGLEVEL_WARNING;
		}
		if (tb[NFTA_LOG_FLAGS] != NULL) {
			li->u.log.logflags =
				ntohl(nla_get_be32(tb[NFTA_LOG_FLAGS]));
		}
		break;
	case NF_LOG_TYPE_ULOG:
		li->u.ulog.group = ntohs(nla_get_be16(tb[NFTA_LOG_GROUP]));
		if (tb[NFTA_LOG_SNAPLEN] != NULL) {
			li->u.ulog.copy_len =
				ntohl(nla_get_be32(tb[NFTA_LOG_SNAPLEN]));
		}
		if (tb[NFTA_LOG_QTHRESHOLD] != NULL) {
			li->u.ulog.qthreshold =
				ntohs(nla_get_be16(tb[NFTA_LOG_QTHRESHOLD]));
		}
		break;
	}

	if (ctx->afi->family == NFPROTO_INET) {
		ret = nf_logger_find_get(NFPROTO_IPV4, li->type);
		if (ret < 0)
			return ret;

		ret = nf_logger_find_get(NFPROTO_IPV6, li->type);
		if (ret < 0) {
			nf_logger_put(NFPROTO_IPV4, li->type);
			return ret;
		}
		return 0;
	}

	return nf_logger_find_get(ctx->afi->family, li->type);
}

static void nft_log_destroy(const struct nft_ctx *ctx,
			    const struct nft_expr *expr)
{
	struct nft_log *priv = nft_expr_priv(expr);
	struct nf_loginfo *li = &priv->loginfo;

	if (priv->prefix != nft_log_null_prefix)
		kfree(priv->prefix);

	if (ctx->afi->family == NFPROTO_INET) {
		nf_logger_put(NFPROTO_IPV4, li->type);
		nf_logger_put(NFPROTO_IPV6, li->type);
	} else {
		nf_logger_put(ctx->afi->family, li->type);
	}
}

static int nft_log_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
	const struct nft_log *priv = nft_expr_priv(expr);
	const struct nf_loginfo *li = &priv->loginfo;

	if (priv->prefix != nft_log_null_prefix)
		if (nla_put_string(skb, NFTA_LOG_PREFIX, priv->prefix))
			goto nla_put_failure;
	switch (li->type) {
	case NF_LOG_TYPE_LOG:
		if (nla_put_be32(skb, NFTA_LOG_LEVEL, htonl(li->u.log.level)))
			goto nla_put_failure;

		if (li->u.log.logflags) {
			if (nla_put_be32(skb, NFTA_LOG_FLAGS,
					 htonl(li->u.log.logflags)))
				goto nla_put_failure;
		}
		break;
	case NF_LOG_TYPE_ULOG:
		if (nla_put_be16(skb, NFTA_LOG_GROUP, htons(li->u.ulog.group)))
			goto nla_put_failure;

		if (li->u.ulog.copy_len) {
			if (nla_put_be32(skb, NFTA_LOG_SNAPLEN,
					 htonl(li->u.ulog.copy_len)))
				goto nla_put_failure;
		}
		if (li->u.ulog.qthreshold) {
			if (nla_put_be16(skb, NFTA_LOG_QTHRESHOLD,
					 htons(li->u.ulog.qthreshold)))
				goto nla_put_failure;
		}
		break;
	}
	return 0;

nla_put_failure:
	return -1;
}

static struct nft_expr_type nft_log_type;
static const struct nft_expr_ops nft_log_ops = {
	.type		= &nft_log_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_log)),
	.eval		= nft_log_eval,
	.init		= nft_log_init,
	.destroy	= nft_log_destroy,
	.dump		= nft_log_dump,
};

static struct nft_expr_type nft_log_type __read_mostly = {
	.name		= "log",
	.ops		= &nft_log_ops,
	.policy		= nft_log_policy,
	.maxattr	= NFTA_LOG_MAX,
	.owner		= THIS_MODULE,
};

static int __init nft_log_module_init(void)
{
	return nft_register_expr(&nft_log_type);
}

static void __exit nft_log_module_exit(void)
{
	nft_unregister_expr(&nft_log_type);
}

module_init(nft_log_module_init);
module_exit(nft_log_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_ALIAS_NFT_EXPR("log");
Commit	Line	Data
96518518	1	/*
ef1f7df9	2	* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
09d27b88	3	* Copyright (c) 2012-2014 Pablo Neira Ayuso <pablo@netfilter.org>
96518518 PM	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*
	9	* Development of this code funded by Astaro AG (http://www.astaro.com/)
	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/init.h>
	14	#include <linux/module.h>
	15	#include <linux/netlink.h>
	16	#include <linux/netfilter.h>
	17	#include <linux/netfilter/nf_tables.h>
	18	#include <net/netfilter/nf_tables.h>
	19	#include <net/netfilter/nf_log.h>
	20	#include <linux/netdevice.h>
	21
	22	static const char *nft_log_null_prefix = "";
	23
	24	struct nft_log {
	25	struct nf_loginfo loginfo;
	26	char *prefix;
96518518 PM	27	};
	28
	29	static void nft_log_eval(const struct nft_expr *expr,
a55e22e9	30	struct nft_regs *regs,
96518518 PM	31	const struct nft_pktinfo *pkt)
	32	{
	33	const struct nft_log *priv = nft_expr_priv(expr);
	34	struct net *net = dev_net(pkt->in ? pkt->in : pkt->out);
	35
b8ecbee6	36	nf_log_packet(net, pkt->ops->pf, pkt->ops->hooknum, pkt->skb, pkt->in,
96518518 PM	37	pkt->out, &priv->loginfo, "%s", priv->prefix);
	38	}
	39
	40	static const struct nla_policy nft_log_policy[NFTA_LOG_MAX + 1] = {
	41	[NFTA_LOG_GROUP] = { .type = NLA_U16 },
	42	[NFTA_LOG_PREFIX] = { .type = NLA_STRING },
	43	[NFTA_LOG_SNAPLEN] = { .type = NLA_U32 },
	44	[NFTA_LOG_QTHRESHOLD] = { .type = NLA_U16 },
09d27b88 PNA	45	[NFTA_LOG_LEVEL] = { .type = NLA_U32 },
09d27b88 PNA	46	[NFTA_LOG_FLAGS] = { .type = NLA_U32 },
96518518 PM	47	};
	48
	49	static int nft_log_init(const struct nft_ctx *ctx,
	50	const struct nft_expr *expr,
	51	const struct nlattr * const tb[])
	52	{
	53	struct nft_log *priv = nft_expr_priv(expr);
	54	struct nf_loginfo *li = &priv->loginfo;
	55	const struct nlattr *nla;
85d30e24	56	int ret;
96518518	57
96518518 PM	58	nla = tb[NFTA_LOG_PREFIX];
	59	if (nla != NULL) {
	60	priv->prefix = kmalloc(nla_len(nla) + 1, GFP_KERNEL);
	61	if (priv->prefix == NULL)
	62	return -ENOMEM;
	63	nla_strlcpy(priv->prefix, nla, nla_len(nla) + 1);
09d27b88	64	} else {
96518518	65	priv->prefix = (char *)nft_log_null_prefix;
09d27b88	66	}
96518518	67
09d27b88 PNA	68	li->type = NF_LOG_TYPE_LOG;
	69	if (tb[NFTA_LOG_LEVEL] != NULL &&
	70	tb[NFTA_LOG_GROUP] != NULL)
	71	return -EINVAL;
96518518	72	if (tb[NFTA_LOG_GROUP] != NULL)
09d27b88 PNA	73	li->type = NF_LOG_TYPE_ULOG;
	74
	75	switch (li->type) {
	76	case NF_LOG_TYPE_LOG:
	77	if (tb[NFTA_LOG_LEVEL] != NULL) {
	78	li->u.log.level =
5cbfda20	79	ntohl(nla_get_be32(tb[NFTA_LOG_LEVEL]));
09d27b88	80	} else {
a81b2ce8	81	li->u.log.level = LOGLEVEL_WARNING;
09d27b88 PNA	82	}
	83	if (tb[NFTA_LOG_FLAGS] != NULL) {
	84	li->u.log.logflags =
	85	ntohl(nla_get_be32(tb[NFTA_LOG_FLAGS]));
	86	}
	87	break;
	88	case NF_LOG_TYPE_ULOG:
96518518	89	li->u.ulog.group = ntohs(nla_get_be16(tb[NFTA_LOG_GROUP]));
09d27b88 PNA	90	if (tb[NFTA_LOG_SNAPLEN] != NULL) {
	91	li->u.ulog.copy_len =
	92	ntohl(nla_get_be32(tb[NFTA_LOG_SNAPLEN]));
	93	}
	94	if (tb[NFTA_LOG_QTHRESHOLD] != NULL) {
	95	li->u.ulog.qthreshold =
	96	ntohs(nla_get_be16(tb[NFTA_LOG_QTHRESHOLD]));
	97	}
	98	break;
96518518 PM	99	}
96518518 PM	100
85d30e24 PNA	101	if (ctx->afi->family == NFPROTO_INET) {
	102	ret = nf_logger_find_get(NFPROTO_IPV4, li->type);
	103	if (ret < 0)
	104	return ret;
	105
	106	ret = nf_logger_find_get(NFPROTO_IPV6, li->type);
	107	if (ret < 0) {
	108	nf_logger_put(NFPROTO_IPV4, li->type);
	109	return ret;
	110	}
	111	return 0;
	112	}
	113
	114	return nf_logger_find_get(ctx->afi->family, li->type);
96518518 PM	115	}
96518518 PM	116
62472bce PM	117	static void nft_log_destroy(const struct nft_ctx *ctx,
62472bce PM	118	const struct nft_expr *expr)
96518518 PM	119	{
96518518 PM	120	struct nft_log *priv = nft_expr_priv(expr);
85d30e24	121	struct nf_loginfo *li = &priv->loginfo;
96518518 PM	122
	123	if (priv->prefix != nft_log_null_prefix)
	124	kfree(priv->prefix);
85d30e24 PNA	125
	126	if (ctx->afi->family == NFPROTO_INET) {
	127	nf_logger_put(NFPROTO_IPV4, li->type);
	128	nf_logger_put(NFPROTO_IPV6, li->type);
	129	} else {
	130	nf_logger_put(ctx->afi->family, li->type);
	131	}
96518518 PM	132	}
	133
	134	static int nft_log_dump(struct sk_buff skb, const struct nft_expr expr)
	135	{
	136	const struct nft_log *priv = nft_expr_priv(expr);
	137	const struct nf_loginfo *li = &priv->loginfo;
	138
	139	if (priv->prefix != nft_log_null_prefix)
	140	if (nla_put_string(skb, NFTA_LOG_PREFIX, priv->prefix))
	141	goto nla_put_failure;
09d27b88 PNA	142	switch (li->type) {
	143	case NF_LOG_TYPE_LOG:
	144	if (nla_put_be32(skb, NFTA_LOG_LEVEL, htonl(li->u.log.level)))
96518518	145	goto nla_put_failure;
09d27b88 PNA	146
	147	if (li->u.log.logflags) {
	148	if (nla_put_be32(skb, NFTA_LOG_FLAGS,
	149	htonl(li->u.log.logflags)))
	150	goto nla_put_failure;
	151	}
	152	break;
	153	case NF_LOG_TYPE_ULOG:
	154	if (nla_put_be16(skb, NFTA_LOG_GROUP, htons(li->u.ulog.group)))
96518518	155	goto nla_put_failure;
09d27b88 PNA	156
	157	if (li->u.ulog.copy_len) {
	158	if (nla_put_be32(skb, NFTA_LOG_SNAPLEN,
	159	htonl(li->u.ulog.copy_len)))
	160	goto nla_put_failure;
	161	}
	162	if (li->u.ulog.qthreshold) {
	163	if (nla_put_be16(skb, NFTA_LOG_QTHRESHOLD,
	164	htons(li->u.ulog.qthreshold)))
	165	goto nla_put_failure;
	166	}
	167	break;
	168	}
96518518 PM	169	return 0;
	170
	171	nla_put_failure:
	172	return -1;
	173	}
	174
ef1f7df9 PM	175	static struct nft_expr_type nft_log_type;
	176	static const struct nft_expr_ops nft_log_ops = {
	177	.type = &nft_log_type,
96518518	178	.size = NFT_EXPR_SIZE(sizeof(struct nft_log)),
96518518 PM	179	.eval = nft_log_eval,
	180	.init = nft_log_init,
	181	.destroy = nft_log_destroy,
	182	.dump = nft_log_dump,
ef1f7df9 PM	183	};
	184
	185	static struct nft_expr_type nft_log_type __read_mostly = {
	186	.name = "log",
	187	.ops = &nft_log_ops,
96518518 PM	188	.policy = nft_log_policy,
96518518 PM	189	.maxattr = NFTA_LOG_MAX,
ef1f7df9	190	.owner = THIS_MODULE,
96518518 PM	191	};
	192
	193	static int __init nft_log_module_init(void)
	194	{
ef1f7df9	195	return nft_register_expr(&nft_log_type);
96518518 PM	196	}
	197
	198	static void __exit nft_log_module_exit(void)
	199	{
ef1f7df9	200	nft_unregister_expr(&nft_log_type);
96518518 PM	201	}
	202
	203	module_init(nft_log_module_init);
	204	module_exit(nft_log_module_exit);
	205
	206	MODULE_LICENSE("GPL");
	207	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	208	MODULE_ALIAS_NFT_EXPR("log");