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

/*
 * Copyright (c) 2016 Laura Garcia <nevola@gmail.com>
 *
 * 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/nf_tables_core.h>
#include <linux/jhash.h>

struct nft_jhash {
	enum nft_registers      sreg:8;
	enum nft_registers      dreg:8;
	u8			len;
	bool			autogen_seed:1;
	u32			modulus;
	u32			seed;
	u32			offset;
	struct nft_set		*map;
};

static void nft_jhash_eval(const struct nft_expr *expr,
			   struct nft_regs *regs,
			   const struct nft_pktinfo *pkt)
{
	struct nft_jhash *priv = nft_expr_priv(expr);
	const void *data = &regs->data[priv->sreg];
	u32 h;

	h = reciprocal_scale(jhash(data, priv->len, priv->seed),
			     priv->modulus);

	regs->data[priv->dreg] = h + priv->offset;
}

static void nft_jhash_map_eval(const struct nft_expr *expr,
			       struct nft_regs *regs,
			       const struct nft_pktinfo *pkt)
{
	struct nft_jhash *priv = nft_expr_priv(expr);
	const void *data = &regs->data[priv->sreg];
	const struct nft_set *map = priv->map;
	const struct nft_set_ext *ext;
	u32 result;
	bool found;

	result = reciprocal_scale(jhash(data, priv->len, priv->seed),
					priv->modulus) + priv->offset;

	found = map->ops->lookup(nft_net(pkt), map, &result, &ext);
	if (!found)
		return;

	nft_data_copy(&regs->data[priv->dreg],
		      nft_set_ext_data(ext), map->dlen);
}

struct nft_symhash {
	enum nft_registers      dreg:8;
	u32			modulus;
	u32			offset;
	struct nft_set		*map;
};

static void nft_symhash_eval(const struct nft_expr *expr,
			     struct nft_regs *regs,
			     const struct nft_pktinfo *pkt)
{
	struct nft_symhash *priv = nft_expr_priv(expr);
	struct sk_buff *skb = pkt->skb;
	u32 h;

	h = reciprocal_scale(__skb_get_hash_symmetric(skb), priv->modulus);

	regs->data[priv->dreg] = h + priv->offset;
}

static void nft_symhash_map_eval(const struct nft_expr *expr,
				 struct nft_regs *regs,
				 const struct nft_pktinfo *pkt)
{
	struct nft_symhash *priv = nft_expr_priv(expr);
	struct sk_buff *skb = pkt->skb;
	const struct nft_set *map = priv->map;
	const struct nft_set_ext *ext;
	u32 result;
	bool found;

	result = reciprocal_scale(__skb_get_hash_symmetric(skb),
				  priv->modulus) + priv->offset;

	found = map->ops->lookup(nft_net(pkt), map, &result, &ext);
	if (!found)
		return;

	nft_data_copy(&regs->data[priv->dreg],
		      nft_set_ext_data(ext), map->dlen);
}

static const struct nla_policy nft_hash_policy[NFTA_HASH_MAX + 1] = {
	[NFTA_HASH_SREG]	= { .type = NLA_U32 },
	[NFTA_HASH_DREG]	= { .type = NLA_U32 },
	[NFTA_HASH_LEN]		= { .type = NLA_U32 },
	[NFTA_HASH_MODULUS]	= { .type = NLA_U32 },
	[NFTA_HASH_SEED]	= { .type = NLA_U32 },
	[NFTA_HASH_OFFSET]	= { .type = NLA_U32 },
	[NFTA_HASH_TYPE]	= { .type = NLA_U32 },
	[NFTA_HASH_SET_NAME]	= { .type = NLA_STRING,
				    .len = NFT_SET_MAXNAMELEN - 1 },
	[NFTA_HASH_SET_ID]	= { .type = NLA_U32 },
};

static int nft_jhash_init(const struct nft_ctx *ctx,
			  const struct nft_expr *expr,
			  const struct nlattr * const tb[])
{
	struct nft_jhash *priv = nft_expr_priv(expr);
	u32 len;
	int err;

	if (!tb[NFTA_HASH_SREG] ||
	    !tb[NFTA_HASH_DREG] ||
	    !tb[NFTA_HASH_LEN]  ||
	    !tb[NFTA_HASH_MODULUS])
		return -EINVAL;

	if (tb[NFTA_HASH_OFFSET])
		priv->offset = ntohl(nla_get_be32(tb[NFTA_HASH_OFFSET]));

	priv->sreg = nft_parse_register(tb[NFTA_HASH_SREG]);
	priv->dreg = nft_parse_register(tb[NFTA_HASH_DREG]);

	err = nft_parse_u32_check(tb[NFTA_HASH_LEN], U8_MAX, &len);
	if (err < 0)
		return err;
	if (len == 0)
		return -ERANGE;

	priv->len = len;

	priv->modulus = ntohl(nla_get_be32(tb[NFTA_HASH_MODULUS]));
	if (priv->modulus < 1)
		return -ERANGE;

	if (priv->offset + priv->modulus - 1 < priv->offset)
		return -EOVERFLOW;

	if (tb[NFTA_HASH_SEED]) {
		priv->seed = ntohl(nla_get_be32(tb[NFTA_HASH_SEED]));
	} else {
		priv->autogen_seed = true;
		get_random_bytes(&priv->seed, sizeof(priv->seed));
	}

	return nft_validate_register_load(priv->sreg, len) &&
	       nft_validate_register_store(ctx, priv->dreg, NULL,
					   NFT_DATA_VALUE, sizeof(u32));
}

static int nft_jhash_map_init(const struct nft_ctx *ctx,
			      const struct nft_expr *expr,
			      const struct nlattr * const tb[])
{
	struct nft_jhash *priv = nft_expr_priv(expr);
	u8 genmask = nft_genmask_next(ctx->net);

	nft_jhash_init(ctx, expr, tb);
	priv->map = nft_set_lookup_global(ctx->net, ctx->table,
					  tb[NFTA_HASH_SET_NAME],
					  tb[NFTA_HASH_SET_ID], genmask);
	return PTR_ERR_OR_ZERO(priv->map);
}

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

	if (!tb[NFTA_HASH_DREG]    ||
	    !tb[NFTA_HASH_MODULUS])
		return -EINVAL;

	if (tb[NFTA_HASH_OFFSET])
		priv->offset = ntohl(nla_get_be32(tb[NFTA_HASH_OFFSET]));

	priv->dreg = nft_parse_register(tb[NFTA_HASH_DREG]);

	priv->modulus = ntohl(nla_get_be32(tb[NFTA_HASH_MODULUS]));
	if (priv->modulus <= 1)
		return -ERANGE;

	if (priv->offset + priv->modulus - 1 < priv->offset)
		return -EOVERFLOW;

	return nft_validate_register_store(ctx, priv->dreg, NULL,
					   NFT_DATA_VALUE, sizeof(u32));
}

static int nft_symhash_map_init(const struct nft_ctx *ctx,
				const struct nft_expr *expr,
				const struct nlattr * const tb[])
{
	struct nft_jhash *priv = nft_expr_priv(expr);
	u8 genmask = nft_genmask_next(ctx->net);

	nft_symhash_init(ctx, expr, tb);
	priv->map = nft_set_lookup_global(ctx->net, ctx->table,
					  tb[NFTA_HASH_SET_NAME],
					  tb[NFTA_HASH_SET_ID], genmask);
	return PTR_ERR_OR_ZERO(priv->map);
}

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

	if (nft_dump_register(skb, NFTA_HASH_SREG, priv->sreg))
		goto nla_put_failure;
	if (nft_dump_register(skb, NFTA_HASH_DREG, priv->dreg))
		goto nla_put_failure;
	if (nla_put_be32(skb, NFTA_HASH_LEN, htonl(priv->len)))
		goto nla_put_failure;
	if (nla_put_be32(skb, NFTA_HASH_MODULUS, htonl(priv->modulus)))
		goto nla_put_failure;
	if (!priv->autogen_seed &&
	    nla_put_be32(skb, NFTA_HASH_SEED, htonl(priv->seed)))
		goto nla_put_failure;
	if (priv->offset != 0)
		if (nla_put_be32(skb, NFTA_HASH_OFFSET, htonl(priv->offset)))
			goto nla_put_failure;
	if (nla_put_be32(skb, NFTA_HASH_TYPE, htonl(NFT_HASH_JENKINS)))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -1;
}

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

	if (nft_jhash_dump(skb, expr) ||
	    nla_put_string(skb, NFTA_HASH_SET_NAME, priv->map->name))
		return -1;

	return 0;
}

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

	if (nft_dump_register(skb, NFTA_HASH_DREG, priv->dreg))
		goto nla_put_failure;
	if (nla_put_be32(skb, NFTA_HASH_MODULUS, htonl(priv->modulus)))
		goto nla_put_failure;
	if (priv->offset != 0)
		if (nla_put_be32(skb, NFTA_HASH_OFFSET, htonl(priv->offset)))
			goto nla_put_failure;
	if (nla_put_be32(skb, NFTA_HASH_TYPE, htonl(NFT_HASH_SYM)))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -1;
}

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

	if (nft_symhash_dump(skb, expr) ||
	    nla_put_string(skb, NFTA_HASH_SET_NAME, priv->map->name))
		return -1;

	return 0;
}

static struct nft_expr_type nft_hash_type;
static const struct nft_expr_ops nft_jhash_ops = {
	.type		= &nft_hash_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_jhash)),
	.eval		= nft_jhash_eval,
	.init		= nft_jhash_init,
	.dump		= nft_jhash_dump,
};

static const struct nft_expr_ops nft_jhash_map_ops = {
	.type		= &nft_hash_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_jhash)),
	.eval		= nft_jhash_map_eval,
	.init		= nft_jhash_map_init,
	.dump		= nft_jhash_map_dump,
};

static const struct nft_expr_ops nft_symhash_ops = {
	.type		= &nft_hash_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_symhash)),
	.eval		= nft_symhash_eval,
	.init		= nft_symhash_init,
	.dump		= nft_symhash_dump,
};

static const struct nft_expr_ops nft_symhash_map_ops = {
	.type		= &nft_hash_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_symhash)),
	.eval		= nft_symhash_map_eval,
	.init		= nft_symhash_map_init,
	.dump		= nft_symhash_map_dump,
};

static const struct nft_expr_ops *
nft_hash_select_ops(const struct nft_ctx *ctx,
		    const struct nlattr * const tb[])
{
	u32 type;

	if (!tb[NFTA_HASH_TYPE])
		return &nft_jhash_ops;

	type = ntohl(nla_get_be32(tb[NFTA_HASH_TYPE]));
	switch (type) {
	case NFT_HASH_SYM:
		if (tb[NFTA_HASH_SET_NAME])
			return &nft_symhash_map_ops;
		return &nft_symhash_ops;
	case NFT_HASH_JENKINS:
		if (tb[NFTA_HASH_SET_NAME])
			return &nft_jhash_map_ops;
		return &nft_jhash_ops;
	default:
		break;
	}
	return ERR_PTR(-EOPNOTSUPP);
}

static struct nft_expr_type nft_hash_type __read_mostly = {
	.name		= "hash",
	.select_ops	= nft_hash_select_ops,
	.policy		= nft_hash_policy,
	.maxattr	= NFTA_HASH_MAX,
	.owner		= THIS_MODULE,
};

static int __init nft_hash_module_init(void)
{
	return nft_register_expr(&nft_hash_type);
}

static void __exit nft_hash_module_exit(void)
{
	nft_unregister_expr(&nft_hash_type);
}

module_init(nft_hash_module_init);
module_exit(nft_hash_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Laura Garcia <nevola@gmail.com>");
MODULE_ALIAS_NFT_EXPR("hash");
Commit	Line	Data
cb1b69b0 LGL	1	/*
	2	* Copyright (c) 2016 Laura Garcia <nevola@gmail.com>
	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
	10	#include <linux/kernel.h>
	11	#include <linux/init.h>
	12	#include <linux/module.h>
	13	#include <linux/netlink.h>
	14	#include <linux/netfilter.h>
	15	#include <linux/netfilter/nf_tables.h>
	16	#include <net/netfilter/nf_tables.h>
	17	#include <net/netfilter/nf_tables_core.h>
	18	#include <linux/jhash.h>
	19
511040ee	20	struct nft_jhash {
cb1b69b0 LGL	21	enum nft_registers sreg:8;
	22	enum nft_registers dreg:8;
	23	u8 len;
79e09ef9	24	bool autogen_seed:1;
cb1b69b0 LGL	25	u32 modulus;
cb1b69b0 LGL	26	u32 seed;
70ca767e	27	u32 offset;
b9ccc07e	28	struct nft_set *map;
cb1b69b0 LGL	29	};
cb1b69b0 LGL	30
511040ee LGL	31	static void nft_jhash_eval(const struct nft_expr *expr,
	32	struct nft_regs *regs,
	33	const struct nft_pktinfo *pkt)
cb1b69b0	34	{
511040ee	35	struct nft_jhash *priv = nft_expr_priv(expr);
cb1b69b0	36	const void *data = &regs->data[priv->sreg];
70ca767e	37	u32 h;
cb1b69b0	38
b9ccc07e LGL	39	h = reciprocal_scale(jhash(data, priv->len, priv->seed),
	40	priv->modulus);
	41
70ca767e	42	regs->data[priv->dreg] = h + priv->offset;
cb1b69b0 LGL	43	}
cb1b69b0 LGL	44
b9ccc07e LGL	45	static void nft_jhash_map_eval(const struct nft_expr *expr,
	46	struct nft_regs *regs,
	47	const struct nft_pktinfo *pkt)
	48	{
	49	struct nft_jhash *priv = nft_expr_priv(expr);
	50	const void *data = &regs->data[priv->sreg];
	51	const struct nft_set *map = priv->map;
	52	const struct nft_set_ext *ext;
	53	u32 result;
	54	bool found;
	55
	56	result = reciprocal_scale(jhash(data, priv->len, priv->seed),
	57	priv->modulus) + priv->offset;
	58
	59	found = map->ops->lookup(nft_net(pkt), map, &result, &ext);
	60	if (!found)
	61	return;
	62
	63	nft_data_copy(&regs->data[priv->dreg],
	64	nft_set_ext_data(ext), map->dlen);
	65	}
	66
3206cade LGL	67	struct nft_symhash {
	68	enum nft_registers dreg:8;
	69	u32 modulus;
	70	u32 offset;
b9ccc07e	71	struct nft_set *map;
3206cade LGL	72	};
	73
	74	static void nft_symhash_eval(const struct nft_expr *expr,
	75	struct nft_regs *regs,
	76	const struct nft_pktinfo *pkt)
	77	{
	78	struct nft_symhash *priv = nft_expr_priv(expr);
	79	struct sk_buff *skb = pkt->skb;
	80	u32 h;
	81
	82	h = reciprocal_scale(__skb_get_hash_symmetric(skb), priv->modulus);
	83
	84	regs->data[priv->dreg] = h + priv->offset;
	85	}
	86
b9ccc07e LGL	87	static void nft_symhash_map_eval(const struct nft_expr *expr,
	88	struct nft_regs *regs,
	89	const struct nft_pktinfo *pkt)
	90	{
	91	struct nft_symhash *priv = nft_expr_priv(expr);
	92	struct sk_buff *skb = pkt->skb;
	93	const struct nft_set *map = priv->map;
	94	const struct nft_set_ext *ext;
	95	u32 result;
	96	bool found;
	97
	98	result = reciprocal_scale(__skb_get_hash_symmetric(skb),
	99	priv->modulus) + priv->offset;
	100
	101	found = map->ops->lookup(nft_net(pkt), map, &result, &ext);
	102	if (!found)
	103	return;
	104
	105	nft_data_copy(&regs->data[priv->dreg],
	106	nft_set_ext_data(ext), map->dlen);
	107	}
	108
a5e57336	109	static const struct nla_policy nft_hash_policy[NFTA_HASH_MAX + 1] = {
cb1b69b0 LGL	110	[NFTA_HASH_SREG] = { .type = NLA_U32 },
	111	[NFTA_HASH_DREG] = { .type = NLA_U32 },
	112	[NFTA_HASH_LEN] = { .type = NLA_U32 },
	113	[NFTA_HASH_MODULUS] = { .type = NLA_U32 },
	114	[NFTA_HASH_SEED] = { .type = NLA_U32 },
5751e175	115	[NFTA_HASH_OFFSET] = { .type = NLA_U32 },
3206cade	116	[NFTA_HASH_TYPE] = { .type = NLA_U32 },
b9ccc07e LGL	117	[NFTA_HASH_SET_NAME] = { .type = NLA_STRING,
	118	.len = NFT_SET_MAXNAMELEN - 1 },
	119	[NFTA_HASH_SET_ID] = { .type = NLA_U32 },
cb1b69b0 LGL	120	};
cb1b69b0 LGL	121
511040ee LGL	122	static int nft_jhash_init(const struct nft_ctx *ctx,
	123	const struct nft_expr *expr,
	124	const struct nlattr * const tb[])
cb1b69b0	125	{
511040ee	126	struct nft_jhash *priv = nft_expr_priv(expr);
cb1b69b0	127	u32 len;
abd66e9f	128	int err;
cb1b69b0 LGL	129
	130	if (!tb[NFTA_HASH_SREG] \|\|
	131	!tb[NFTA_HASH_DREG] \|\|
	132	!tb[NFTA_HASH_LEN] \|\|
cb1b69b0 LGL	133	!tb[NFTA_HASH_MODULUS])
	134	return -EINVAL;
	135
70ca767e LGL	136	if (tb[NFTA_HASH_OFFSET])
	137	priv->offset = ntohl(nla_get_be32(tb[NFTA_HASH_OFFSET]));
	138
cb1b69b0 LGL	139	priv->sreg = nft_parse_register(tb[NFTA_HASH_SREG]);
	140	priv->dreg = nft_parse_register(tb[NFTA_HASH_DREG]);
	141
abd66e9f LGL	142	err = nft_parse_u32_check(tb[NFTA_HASH_LEN], U8_MAX, &len);
	143	if (err < 0)
	144	return err;
	145	if (len == 0)
cb1b69b0 LGL	146	return -ERANGE;
	147
	148	priv->len = len;
	149
	150	priv->modulus = ntohl(nla_get_be32(tb[NFTA_HASH_MODULUS]));
75e72f05	151	if (priv->modulus < 1)
cb1b69b0 LGL	152	return -ERANGE;
cb1b69b0 LGL	153
14e2dee0	154	if (priv->offset + priv->modulus - 1 < priv->offset)
70ca767e LGL	155	return -EOVERFLOW;
70ca767e LGL	156
79e09ef9	157	if (tb[NFTA_HASH_SEED]) {
f86dab3a	158	priv->seed = ntohl(nla_get_be32(tb[NFTA_HASH_SEED]));
79e09ef9 LZ	159	} else {
79e09ef9 LZ	160	priv->autogen_seed = true;
f86dab3a	161	get_random_bytes(&priv->seed, sizeof(priv->seed));
79e09ef9	162	}
cb1b69b0 LGL	163
	164	return nft_validate_register_load(priv->sreg, len) &&
	165	nft_validate_register_store(ctx, priv->dreg, NULL,
	166	NFT_DATA_VALUE, sizeof(u32));
	167	}
	168
b9ccc07e LGL	169	static int nft_jhash_map_init(const struct nft_ctx *ctx,
	170	const struct nft_expr *expr,
	171	const struct nlattr * const tb[])
	172	{
	173	struct nft_jhash *priv = nft_expr_priv(expr);
	174	u8 genmask = nft_genmask_next(ctx->net);
	175
	176	nft_jhash_init(ctx, expr, tb);
	177	priv->map = nft_set_lookup_global(ctx->net, ctx->table,
	178	tb[NFTA_HASH_SET_NAME],
	179	tb[NFTA_HASH_SET_ID], genmask);
7849958b	180	return PTR_ERR_OR_ZERO(priv->map);
b9ccc07e LGL	181	}
b9ccc07e LGL	182
3206cade LGL	183	static int nft_symhash_init(const struct nft_ctx *ctx,
	184	const struct nft_expr *expr,
	185	const struct nlattr * const tb[])
	186	{
	187	struct nft_symhash *priv = nft_expr_priv(expr);
	188
	189	if (!tb[NFTA_HASH_DREG] \|\|
	190	!tb[NFTA_HASH_MODULUS])
	191	return -EINVAL;
	192
	193	if (tb[NFTA_HASH_OFFSET])
	194	priv->offset = ntohl(nla_get_be32(tb[NFTA_HASH_OFFSET]));
	195
	196	priv->dreg = nft_parse_register(tb[NFTA_HASH_DREG]);
	197
	198	priv->modulus = ntohl(nla_get_be32(tb[NFTA_HASH_MODULUS]));
	199	if (priv->modulus <= 1)
	200	return -ERANGE;
	201
	202	if (priv->offset + priv->modulus - 1 < priv->offset)
	203	return -EOVERFLOW;
	204
	205	return nft_validate_register_store(ctx, priv->dreg, NULL,
	206	NFT_DATA_VALUE, sizeof(u32));
	207	}
	208
b9ccc07e LGL	209	static int nft_symhash_map_init(const struct nft_ctx *ctx,
	210	const struct nft_expr *expr,
	211	const struct nlattr * const tb[])
	212	{
	213	struct nft_jhash *priv = nft_expr_priv(expr);
	214	u8 genmask = nft_genmask_next(ctx->net);
	215
	216	nft_symhash_init(ctx, expr, tb);
	217	priv->map = nft_set_lookup_global(ctx->net, ctx->table,
	218	tb[NFTA_HASH_SET_NAME],
	219	tb[NFTA_HASH_SET_ID], genmask);
7849958b	220	return PTR_ERR_OR_ZERO(priv->map);
b9ccc07e LGL	221	}
b9ccc07e LGL	222
511040ee LGL	223	static int nft_jhash_dump(struct sk_buff *skb,
511040ee LGL	224	const struct nft_expr *expr)
cb1b69b0	225	{
511040ee	226	const struct nft_jhash *priv = nft_expr_priv(expr);
cb1b69b0 LGL	227
	228	if (nft_dump_register(skb, NFTA_HASH_SREG, priv->sreg))
	229	goto nla_put_failure;
	230	if (nft_dump_register(skb, NFTA_HASH_DREG, priv->dreg))
	231	goto nla_put_failure;
7073b16f	232	if (nla_put_be32(skb, NFTA_HASH_LEN, htonl(priv->len)))
cb1b69b0	233	goto nla_put_failure;
7073b16f	234	if (nla_put_be32(skb, NFTA_HASH_MODULUS, htonl(priv->modulus)))
cb1b69b0	235	goto nla_put_failure;
79e09ef9 LZ	236	if (!priv->autogen_seed &&
79e09ef9 LZ	237	nla_put_be32(skb, NFTA_HASH_SEED, htonl(priv->seed)))
cb1b69b0	238	goto nla_put_failure;
70ca767e LGL	239	if (priv->offset != 0)
	240	if (nla_put_be32(skb, NFTA_HASH_OFFSET, htonl(priv->offset)))
	241	goto nla_put_failure;
3206cade LGL	242	if (nla_put_be32(skb, NFTA_HASH_TYPE, htonl(NFT_HASH_JENKINS)))
	243	goto nla_put_failure;
	244	return 0;
	245
	246	nla_put_failure:
	247	return -1;
	248	}
	249
b9ccc07e LGL	250	static int nft_jhash_map_dump(struct sk_buff *skb,
	251	const struct nft_expr *expr)
	252	{
	253	const struct nft_jhash *priv = nft_expr_priv(expr);
	254
	255	if (nft_jhash_dump(skb, expr) \|\|
	256	nla_put_string(skb, NFTA_HASH_SET_NAME, priv->map->name))
	257	return -1;
	258
	259	return 0;
	260	}
	261
3206cade LGL	262	static int nft_symhash_dump(struct sk_buff *skb,
	263	const struct nft_expr *expr)
	264	{
	265	const struct nft_symhash *priv = nft_expr_priv(expr);
	266
	267	if (nft_dump_register(skb, NFTA_HASH_DREG, priv->dreg))
	268	goto nla_put_failure;
	269	if (nla_put_be32(skb, NFTA_HASH_MODULUS, htonl(priv->modulus)))
	270	goto nla_put_failure;
	271	if (priv->offset != 0)
	272	if (nla_put_be32(skb, NFTA_HASH_OFFSET, htonl(priv->offset)))
	273	goto nla_put_failure;
	274	if (nla_put_be32(skb, NFTA_HASH_TYPE, htonl(NFT_HASH_SYM)))
	275	goto nla_put_failure;
cb1b69b0 LGL	276	return 0;
	277
	278	nla_put_failure:
	279	return -1;
	280	}
	281
b9ccc07e LGL	282	static int nft_symhash_map_dump(struct sk_buff *skb,
	283	const struct nft_expr *expr)
	284	{
	285	const struct nft_symhash *priv = nft_expr_priv(expr);
	286
	287	if (nft_symhash_dump(skb, expr) \|\|
	288	nla_put_string(skb, NFTA_HASH_SET_NAME, priv->map->name))
	289	return -1;
	290
	291	return 0;
	292	}
	293
cb1b69b0	294	static struct nft_expr_type nft_hash_type;
511040ee	295	static const struct nft_expr_ops nft_jhash_ops = {
cb1b69b0	296	.type = &nft_hash_type,
511040ee LGL	297	.size = NFT_EXPR_SIZE(sizeof(struct nft_jhash)),
	298	.eval = nft_jhash_eval,
	299	.init = nft_jhash_init,
	300	.dump = nft_jhash_dump,
cb1b69b0 LGL	301	};
cb1b69b0 LGL	302
b9ccc07e LGL	303	static const struct nft_expr_ops nft_jhash_map_ops = {
	304	.type = &nft_hash_type,
	305	.size = NFT_EXPR_SIZE(sizeof(struct nft_jhash)),
	306	.eval = nft_jhash_map_eval,
	307	.init = nft_jhash_map_init,
	308	.dump = nft_jhash_map_dump,
	309	};
	310
3206cade LGL	311	static const struct nft_expr_ops nft_symhash_ops = {
	312	.type = &nft_hash_type,
	313	.size = NFT_EXPR_SIZE(sizeof(struct nft_symhash)),
	314	.eval = nft_symhash_eval,
	315	.init = nft_symhash_init,
	316	.dump = nft_symhash_dump,
	317	};
	318
b9ccc07e LGL	319	static const struct nft_expr_ops nft_symhash_map_ops = {
	320	.type = &nft_hash_type,
	321	.size = NFT_EXPR_SIZE(sizeof(struct nft_symhash)),
	322	.eval = nft_symhash_map_eval,
	323	.init = nft_symhash_map_init,
	324	.dump = nft_symhash_map_dump,
	325	};
	326
3206cade LGL	327	static const struct nft_expr_ops *
	328	nft_hash_select_ops(const struct nft_ctx *ctx,
	329	const struct nlattr * const tb[])
	330	{
	331	u32 type;
	332
	333	if (!tb[NFTA_HASH_TYPE])
	334	return &nft_jhash_ops;
	335
	336	type = ntohl(nla_get_be32(tb[NFTA_HASH_TYPE]));
	337	switch (type) {
	338	case NFT_HASH_SYM:
b9ccc07e LGL	339	if (tb[NFTA_HASH_SET_NAME])
b9ccc07e LGL	340	return &nft_symhash_map_ops;
3206cade LGL	341	return &nft_symhash_ops;
3206cade LGL	342	case NFT_HASH_JENKINS:
b9ccc07e LGL	343	if (tb[NFTA_HASH_SET_NAME])
b9ccc07e LGL	344	return &nft_jhash_map_ops;
3206cade LGL	345	return &nft_jhash_ops;
	346	default:
	347	break;
	348	}
	349	return ERR_PTR(-EOPNOTSUPP);
	350	}
	351
cb1b69b0 LGL	352	static struct nft_expr_type nft_hash_type __read_mostly = {
cb1b69b0 LGL	353	.name = "hash",
d4ef3835	354	.select_ops = nft_hash_select_ops,
cb1b69b0 LGL	355	.policy = nft_hash_policy,
	356	.maxattr = NFTA_HASH_MAX,
	357	.owner = THIS_MODULE,
	358	};
	359
	360	static int __init nft_hash_module_init(void)
	361	{
	362	return nft_register_expr(&nft_hash_type);
	363	}
	364
	365	static void __exit nft_hash_module_exit(void)
	366	{
	367	nft_unregister_expr(&nft_hash_type);
	368	}
	369
	370	module_init(nft_hash_module_init);
	371	module_exit(nft_hash_module_exit);
	372
	373	MODULE_LICENSE("GPL");
	374	MODULE_AUTHOR("Laura Garcia <nevola@gmail.com>");
	375	MODULE_ALIAS_NFT_EXPR("hash");