1/*
  2 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
  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 * Development of this code funded by Astaro AG (http://www.astaro.com/)
  9 */
 10
 11#include <linux/kernel.h>
 12#include <linux/init.h>
 13#include <linux/module.h>
 14#include <linux/netlink.h>
 15#include <linux/netfilter.h>
 16#include <linux/netfilter/nf_tables.h>
 17#include <net/netfilter/nf_tables_core.h>
 18#include <net/netfilter/nf_tables.h>
 
 19
 20struct nft_immediate_expr {
 21	struct nft_data		data;
 22	enum nft_registers	dreg:8;
 23	u8			dlen;
 24};
 25
 26static void nft_immediate_eval(const struct nft_expr *expr,
 27			       struct nft_regs *regs,
 28			       const struct nft_pktinfo *pkt)
 29{
 30	const struct nft_immediate_expr *priv = nft_expr_priv(expr);
 31
 32	nft_data_copy(&regs->data[priv->dreg], &priv->data, priv->dlen);
 33}
 34
 35static const struct nla_policy nft_immediate_policy[NFTA_IMMEDIATE_MAX + 1] = {
 36	[NFTA_IMMEDIATE_DREG]	= { .type = NLA_U32 },
 37	[NFTA_IMMEDIATE_DATA]	= { .type = NLA_NESTED },
 38};
 39
 40static int nft_immediate_init(const struct nft_ctx *ctx,
 41			      const struct nft_expr *expr,
 42			      const struct nlattr * const tb[])
 43{
 44	struct nft_immediate_expr *priv = nft_expr_priv(expr);
 45	struct nft_data_desc desc;
 46	int err;
 47
 48	if (tb[NFTA_IMMEDIATE_DREG] == NULL ||
 49	    tb[NFTA_IMMEDIATE_DATA] == NULL)
 50		return -EINVAL;
 51
 52	err = nft_data_init(ctx, &priv->data, sizeof(priv->data), &desc,
 53			    tb[NFTA_IMMEDIATE_DATA]);
 54	if (err < 0)
 55		return err;
 56
 57	priv->dlen = desc.len;
 58
 59	priv->dreg = nft_parse_register(tb[NFTA_IMMEDIATE_DREG]);
 60	err = nft_validate_register_store(ctx, priv->dreg, &priv->data,
 61					  desc.type, desc.len);
 62	if (err < 0)
 63		goto err1;
 64
 65	return 0;
 66
 67err1:
 68	nft_data_uninit(&priv->data, desc.type);
 69	return err;
 70}
 71
 72static void nft_immediate_destroy(const struct nft_ctx *ctx,
 73				  const struct nft_expr *expr)
 
 
 
 
 
 
 
 
 
 74{
 75	const struct nft_immediate_expr *priv = nft_expr_priv(expr);
 76	return nft_data_uninit(&priv->data, nft_dreg_to_type(priv->dreg));
 
 
 
 
 77}
 78
 79static int nft_immediate_dump(struct sk_buff *skb, const struct nft_expr *expr)
 80{
 81	const struct nft_immediate_expr *priv = nft_expr_priv(expr);
 82
 83	if (nft_dump_register(skb, NFTA_IMMEDIATE_DREG, priv->dreg))
 84		goto nla_put_failure;
 85
 86	return nft_data_dump(skb, NFTA_IMMEDIATE_DATA, &priv->data,
 87			     nft_dreg_to_type(priv->dreg), priv->dlen);
 88
 89nla_put_failure:
 90	return -1;
 91}
 92
 93static int nft_immediate_validate(const struct nft_ctx *ctx,
 94				  const struct nft_expr *expr,
 95				  const struct nft_data **data)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 96{
 97	const struct nft_immediate_expr *priv = nft_expr_priv(expr);
 98
 99	if (priv->dreg == NFT_REG_VERDICT)
100		*data = &priv->data;
 
 
101
102	return 0;
103}
104
105static const struct nft_expr_ops nft_imm_ops = {
106	.type		= &nft_imm_type,
107	.size		= NFT_EXPR_SIZE(sizeof(struct nft_immediate_expr)),
108	.eval		= nft_immediate_eval,
109	.init		= nft_immediate_init,
110	.destroy	= nft_immediate_destroy,
 
111	.dump		= nft_immediate_dump,
112	.validate	= nft_immediate_validate,
 
 
113};
114
115struct nft_expr_type nft_imm_type __read_mostly = {
116	.name		= "immediate",
117	.ops		= &nft_imm_ops,
118	.policy		= nft_immediate_policy,
119	.maxattr	= NFTA_IMMEDIATE_MAX,
120	.owner		= THIS_MODULE,
121};

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
  4 *
 
 
 
 
  5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
  6 */
  7
  8#include <linux/kernel.h>
  9#include <linux/init.h>
 10#include <linux/module.h>
 11#include <linux/netlink.h>
 12#include <linux/netfilter.h>
 13#include <linux/netfilter/nf_tables.h>
 14#include <net/netfilter/nf_tables_core.h>
 15#include <net/netfilter/nf_tables.h>
 16#include <net/netfilter/nf_tables_offload.h>
 17
 18void nft_immediate_eval(const struct nft_expr *expr,
 19			struct nft_regs *regs,
 20			const struct nft_pktinfo *pkt)
 
 
 
 
 
 
 21{
 22	const struct nft_immediate_expr *priv = nft_expr_priv(expr);
 23
 24	nft_data_copy(&regs->data[priv->dreg], &priv->data, priv->dlen);
 25}
 26
 27static const struct nla_policy nft_immediate_policy[NFTA_IMMEDIATE_MAX + 1] = {
 28	[NFTA_IMMEDIATE_DREG]	= { .type = NLA_U32 },
 29	[NFTA_IMMEDIATE_DATA]	= { .type = NLA_NESTED },
 30};
 31
 32static int nft_immediate_init(const struct nft_ctx *ctx,
 33			      const struct nft_expr *expr,
 34			      const struct nlattr * const tb[])
 35{
 36	struct nft_immediate_expr *priv = nft_expr_priv(expr);
 37	struct nft_data_desc desc;
 38	int err;
 39
 40	if (tb[NFTA_IMMEDIATE_DREG] == NULL ||
 41	    tb[NFTA_IMMEDIATE_DATA] == NULL)
 42		return -EINVAL;
 43
 44	err = nft_data_init(ctx, &priv->data, sizeof(priv->data), &desc,
 45			    tb[NFTA_IMMEDIATE_DATA]);
 46	if (err < 0)
 47		return err;
 48
 49	priv->dlen = desc.len;
 50
 51	priv->dreg = nft_parse_register(tb[NFTA_IMMEDIATE_DREG]);
 52	err = nft_validate_register_store(ctx, priv->dreg, &priv->data,
 53					  desc.type, desc.len);
 54	if (err < 0)
 55		goto err1;
 56
 57	return 0;
 58
 59err1:
 60	nft_data_release(&priv->data, desc.type);
 61	return err;
 62}
 63
 64static void nft_immediate_activate(const struct nft_ctx *ctx,
 65				   const struct nft_expr *expr)
 66{
 67	const struct nft_immediate_expr *priv = nft_expr_priv(expr);
 68
 69	return nft_data_hold(&priv->data, nft_dreg_to_type(priv->dreg));
 70}
 71
 72static void nft_immediate_deactivate(const struct nft_ctx *ctx,
 73				     const struct nft_expr *expr,
 74				     enum nft_trans_phase phase)
 75{
 76	const struct nft_immediate_expr *priv = nft_expr_priv(expr);
 77
 78	if (phase == NFT_TRANS_COMMIT)
 79		return;
 80
 81	return nft_data_release(&priv->data, nft_dreg_to_type(priv->dreg));
 82}
 83
 84static int nft_immediate_dump(struct sk_buff *skb, const struct nft_expr *expr)
 85{
 86	const struct nft_immediate_expr *priv = nft_expr_priv(expr);
 87
 88	if (nft_dump_register(skb, NFTA_IMMEDIATE_DREG, priv->dreg))
 89		goto nla_put_failure;
 90
 91	return nft_data_dump(skb, NFTA_IMMEDIATE_DATA, &priv->data,
 92			     nft_dreg_to_type(priv->dreg), priv->dlen);
 93
 94nla_put_failure:
 95	return -1;
 96}
 97
 98static int nft_immediate_validate(const struct nft_ctx *ctx,
 99				  const struct nft_expr *expr,
100				  const struct nft_data **d)
101{
102	const struct nft_immediate_expr *priv = nft_expr_priv(expr);
103	struct nft_ctx *pctx = (struct nft_ctx *)ctx;
104	const struct nft_data *data;
105	int err;
106
107	if (priv->dreg != NFT_REG_VERDICT)
108		return 0;
109
110	data = &priv->data;
111
112	switch (data->verdict.code) {
113	case NFT_JUMP:
114	case NFT_GOTO:
115		pctx->level++;
116		err = nft_chain_validate(ctx, data->verdict.chain);
117		if (err < 0)
118			return err;
119		pctx->level--;
120		break;
121	default:
122		break;
123	}
124
125	return 0;
126}
127
128static int nft_immediate_offload_verdict(struct nft_offload_ctx *ctx,
129					 struct nft_flow_rule *flow,
130					 const struct nft_immediate_expr *priv)
131{
132	struct flow_action_entry *entry;
133	const struct nft_data *data;
134
135	entry = &flow->rule->action.entries[ctx->num_actions++];
136
137	data = &priv->data;
138	switch (data->verdict.code) {
139	case NF_ACCEPT:
140		entry->id = FLOW_ACTION_ACCEPT;
141		break;
142	case NF_DROP:
143		entry->id = FLOW_ACTION_DROP;
144		break;
145	default:
146		return -EOPNOTSUPP;
147	}
148
149	return 0;
150}
151
152static int nft_immediate_offload(struct nft_offload_ctx *ctx,
153				 struct nft_flow_rule *flow,
154				 const struct nft_expr *expr)
155{
156	const struct nft_immediate_expr *priv = nft_expr_priv(expr);
157
158	if (priv->dreg == NFT_REG_VERDICT)
159		return nft_immediate_offload_verdict(ctx, flow, priv);
160
161	memcpy(&ctx->regs[priv->dreg].data, &priv->data, sizeof(priv->data));
162
163	return 0;
164}
165
166static const struct nft_expr_ops nft_imm_ops = {
167	.type		= &nft_imm_type,
168	.size		= NFT_EXPR_SIZE(sizeof(struct nft_immediate_expr)),
169	.eval		= nft_immediate_eval,
170	.init		= nft_immediate_init,
171	.activate	= nft_immediate_activate,
172	.deactivate	= nft_immediate_deactivate,
173	.dump		= nft_immediate_dump,
174	.validate	= nft_immediate_validate,
175	.offload	= nft_immediate_offload,
176	.offload_flags	= NFT_OFFLOAD_F_ACTION,
177};
178
179struct nft_expr_type nft_imm_type __read_mostly = {
180	.name		= "immediate",
181	.ops		= &nft_imm_ops,
182	.policy		= nft_immediate_policy,
183	.maxattr	= NFTA_IMMEDIATE_MAX,
184	.owner		= THIS_MODULE,
185};