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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
*
* 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_core.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables_offload.h>
void nft_immediate_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
const struct nft_immediate_expr *priv = nft_expr_priv(expr);
nft_data_copy(®s->data[priv->dreg], &priv->data, priv->dlen);
}
static const struct nla_policy nft_immediate_policy[NFTA_IMMEDIATE_MAX + 1] = {
[NFTA_IMMEDIATE_DREG] = { .type = NLA_U32 },
[NFTA_IMMEDIATE_DATA] = { .type = NLA_NESTED },
};
static int nft_immediate_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_immediate_expr *priv = nft_expr_priv(expr);
struct nft_data_desc desc;
int err;
if (tb[NFTA_IMMEDIATE_DREG] == NULL ||
tb[NFTA_IMMEDIATE_DATA] == NULL)
return -EINVAL;
err = nft_data_init(ctx, &priv->data, sizeof(priv->data), &desc,
tb[NFTA_IMMEDIATE_DATA]);
if (err < 0)
return err;
priv->dlen = desc.len;
priv->dreg = nft_parse_register(tb[NFTA_IMMEDIATE_DREG]);
err = nft_validate_register_store(ctx, priv->dreg, &priv->data,
desc.type, desc.len);
if (err < 0)
goto err1;
if (priv->dreg == NFT_REG_VERDICT) {
struct nft_chain *chain = priv->data.verdict.chain;
switch (priv->data.verdict.code) {
case NFT_JUMP:
case NFT_GOTO:
if (nft_chain_is_bound(chain)) {
err = -EBUSY;
goto err1;
}
chain->bound = true;
break;
default:
break;
}
}
return 0;
err1:
nft_data_release(&priv->data, desc.type);
return err;
}
static void nft_immediate_activate(const struct nft_ctx *ctx,
const struct nft_expr *expr)
{
const struct nft_immediate_expr *priv = nft_expr_priv(expr);
return nft_data_hold(&priv->data, nft_dreg_to_type(priv->dreg));
}
static void nft_immediate_deactivate(const struct nft_ctx *ctx,
const struct nft_expr *expr,
enum nft_trans_phase phase)
{
const struct nft_immediate_expr *priv = nft_expr_priv(expr);
if (phase == NFT_TRANS_COMMIT)
return;
return nft_data_release(&priv->data, nft_dreg_to_type(priv->dreg));
}
static void nft_immediate_destroy(const struct nft_ctx *ctx,
const struct nft_expr *expr)
{
const struct nft_immediate_expr *priv = nft_expr_priv(expr);
const struct nft_data *data = &priv->data;
struct nft_rule *rule, *n;
struct nft_ctx chain_ctx;
struct nft_chain *chain;
if (priv->dreg != NFT_REG_VERDICT)
return;
switch (data->verdict.code) {
case NFT_JUMP:
case NFT_GOTO:
chain = data->verdict.chain;
if (!nft_chain_is_bound(chain))
break;
chain_ctx = *ctx;
chain_ctx.chain = chain;
list_for_each_entry_safe(rule, n, &chain->rules, list)
nf_tables_rule_release(&chain_ctx, rule);
nf_tables_chain_destroy(&chain_ctx);
break;
default:
break;
}
}
static int nft_immediate_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_immediate_expr *priv = nft_expr_priv(expr);
if (nft_dump_register(skb, NFTA_IMMEDIATE_DREG, priv->dreg))
goto nla_put_failure;
return nft_data_dump(skb, NFTA_IMMEDIATE_DATA, &priv->data,
nft_dreg_to_type(priv->dreg), priv->dlen);
nla_put_failure:
return -1;
}
static int nft_immediate_validate(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nft_data **d)
{
const struct nft_immediate_expr *priv = nft_expr_priv(expr);
struct nft_ctx *pctx = (struct nft_ctx *)ctx;
const struct nft_data *data;
int err;
if (priv->dreg != NFT_REG_VERDICT)
return 0;
data = &priv->data;
switch (data->verdict.code) {
case NFT_JUMP:
case NFT_GOTO:
pctx->level++;
err = nft_chain_validate(ctx, data->verdict.chain);
if (err < 0)
return err;
pctx->level--;
break;
default:
break;
}
return 0;
}
static int nft_immediate_offload_verdict(struct nft_offload_ctx *ctx,
struct nft_flow_rule *flow,
const struct nft_immediate_expr *priv)
{
struct flow_action_entry *entry;
const struct nft_data *data;
entry = &flow->rule->action.entries[ctx->num_actions++];
data = &priv->data;
switch (data->verdict.code) {
case NF_ACCEPT:
entry->id = FLOW_ACTION_ACCEPT;
break;
case NF_DROP:
entry->id = FLOW_ACTION_DROP;
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int nft_immediate_offload(struct nft_offload_ctx *ctx,
struct nft_flow_rule *flow,
const struct nft_expr *expr)
{
const struct nft_immediate_expr *priv = nft_expr_priv(expr);
if (priv->dreg == NFT_REG_VERDICT)
return nft_immediate_offload_verdict(ctx, flow, priv);
memcpy(&ctx->regs[priv->dreg].data, &priv->data, sizeof(priv->data));
return 0;
}
static const struct nft_expr_ops nft_imm_ops = {
.type = &nft_imm_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_immediate_expr)),
.eval = nft_immediate_eval,
.init = nft_immediate_init,
.activate = nft_immediate_activate,
.deactivate = nft_immediate_deactivate,
.destroy = nft_immediate_destroy,
.dump = nft_immediate_dump,
.validate = nft_immediate_validate,
.offload = nft_immediate_offload,
.offload_flags = NFT_OFFLOAD_F_ACTION,
};
struct nft_expr_type nft_imm_type __read_mostly = {
.name = "immediate",
.ops = &nft_imm_ops,
.policy = nft_immediate_policy,
.maxattr = NFTA_IMMEDIATE_MAX,
.owner = THIS_MODULE,
};
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