mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Pablo Neira Ayuso](/assets/img/avatar_default.png)
This new function combines the netlink register attribute parser and the store validation function. This update requires to replace: enum nft_registers dreg:8; in many of the expression private areas otherwise compiler complains with: error: cannot take address of bit-field ‘dreg’ when passing the register field as reference. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
236 lines
5.5 KiB
C
236 lines
5.5 KiB
C
// 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;
|
|
|
|
err = nft_parse_register_store(ctx, tb[NFTA_IMMEDIATE_DREG],
|
|
&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,
|
|
};
|