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netfilter: nft_meta: move bridge meta keys into nft_meta_bridge 

Separate bridge meta key from nft_meta to meta_bridge to avoid a
dependency between the bridge module and nft_meta when using the bridge
API available through include/linux/if_bridge.h

Signed-off-by: wenxu <wenxu@ucloud.cn>
Reviewed-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
wenxu 2019-07-05 21:16:32 +08:00 committed by Pablo Neira Ayuso
parent 6aedd14b25
commit 30e103fe24
6 changed files with 207 additions and 53 deletions
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44
include/net/netfilter/nft_meta.h Normal file
View File

@ -0,0 +1,44 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _NFT_META_H_
#define _NFT_META_H_
struct nft_meta {
enum nft_meta_keys key:8;
union {
enum nft_registers dreg:8;
enum nft_registers sreg:8;
};
};
extern const struct nla_policy nft_meta_policy[];
int nft_meta_get_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[]);
int nft_meta_set_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[]);
int nft_meta_get_dump(struct sk_buff *skb,
const struct nft_expr *expr);
int nft_meta_set_dump(struct sk_buff *skb,
const struct nft_expr *expr);
void nft_meta_get_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt);
void nft_meta_set_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt);
void nft_meta_set_destroy(const struct nft_ctx *ctx,
const struct nft_expr *expr);
int nft_meta_set_validate(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nft_data **data);
#endif

6
net/bridge/netfilter/Kconfig
View File

@ -9,6 +9,12 @@ menuconfig NF_TABLES_BRIDGE
bool "Ethernet Bridge nf_tables support"
if NF_TABLES_BRIDGE
config NFT_BRIDGE_META
tristate "Netfilter nf_table bridge meta support"
help
Add support for bridge dedicated meta key.
config NFT_BRIDGE_REJECT
tristate "Netfilter nf_tables bridge reject support"
depends on NFT_REJECT && NFT_REJECT_IPV4 && NFT_REJECT_IPV6

1
net/bridge/netfilter/Makefile
View File

@ -3,6 +3,7 @@
# Makefile for the netfilter modules for Link Layer filtering on a bridge.
#
obj-$(CONFIG_NFT_BRIDGE_META) += nft_meta_bridge.o
obj-$(CONFIG_NFT_BRIDGE_REJECT) += nft_reject_bridge.o
# connection tracking

127
net/bridge/netfilter/nft_meta_bridge.c Normal file
View File

@ -0,0 +1,127 @@
// SPDX-License-Identifier: GPL-2.0
#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/nft_meta.h>
#include "../br_private.h"
static void nft_meta_bridge_get_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
const struct nft_meta *priv = nft_expr_priv(expr);
const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
u32 *dest = &regs->data[priv->dreg];
const struct net_bridge_port *p;
switch (priv->key) {
case NFT_META_BRI_IIFNAME:
if (in == NULL || (p = br_port_get_rcu(in)) == NULL)
goto err;
break;
case NFT_META_BRI_OIFNAME:
if (out == NULL || (p = br_port_get_rcu(out)) == NULL)
goto err;
break;
default:
goto out;
}
strncpy((char *)dest, p->br->dev->name, IFNAMSIZ);
return;
out:
return nft_meta_get_eval(expr, regs, pkt);
err:
regs->verdict.code = NFT_BREAK;
}
static int nft_meta_bridge_get_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_meta *priv = nft_expr_priv(expr);
unsigned int len;
priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
switch (priv->key) {
case NFT_META_BRI_IIFNAME:
case NFT_META_BRI_OIFNAME:
len = IFNAMSIZ;
break;
default:
return nft_meta_get_init(ctx, expr, tb);
}
priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
return nft_validate_register_store(ctx, priv->dreg, NULL,
NFT_DATA_VALUE, len);
}
static struct nft_expr_type nft_meta_bridge_type;
static const struct nft_expr_ops nft_meta_bridge_get_ops = {
.type = &nft_meta_bridge_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
.eval = nft_meta_bridge_get_eval,
.init = nft_meta_bridge_get_init,
.dump = nft_meta_get_dump,
};
static const struct nft_expr_ops nft_meta_bridge_set_ops = {
.type = &nft_meta_bridge_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
.eval = nft_meta_set_eval,
.init = nft_meta_set_init,
.destroy = nft_meta_set_destroy,
.dump = nft_meta_set_dump,
.validate = nft_meta_set_validate,
};
static const struct nft_expr_ops *
nft_meta_bridge_select_ops(const struct nft_ctx *ctx,
const struct nlattr * const tb[])
{
if (tb[NFTA_META_KEY] == NULL)
return ERR_PTR(-EINVAL);
if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
return ERR_PTR(-EINVAL);
if (tb[NFTA_META_DREG])
return &nft_meta_bridge_get_ops;
if (tb[NFTA_META_SREG])
return &nft_meta_bridge_set_ops;
return ERR_PTR(-EINVAL);
}
static struct nft_expr_type nft_meta_bridge_type __read_mostly = {
.family = NFPROTO_BRIDGE,
.name = "meta",
.select_ops = nft_meta_bridge_select_ops,
.policy = nft_meta_policy,
.maxattr = NFTA_META_MAX,
.owner = THIS_MODULE,
};
static int __init nft_meta_bridge_module_init(void)
{
return nft_register_expr(&nft_meta_bridge_type);
}
static void __exit nft_meta_bridge_module_exit(void)
{
nft_unregister_expr(&nft_meta_bridge_type);
}
module_init(nft_meta_bridge_module_init);
module_exit(nft_meta_bridge_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("wenxu <wenxu@ucloud.cn>");
MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "meta");

1
net/netfilter/nf_tables_core.c
View File

@ -19,6 +19,7 @@
#include <net/netfilter/nf_tables_core.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_log.h>
#include <net/netfilter/nft_meta.h>
static noinline void __nft_trace_packet(struct nft_traceinfo *info,
const struct nft_chain *chain,

81
net/netfilter/nft_meta.c
View File

@ -21,23 +21,12 @@
#include <net/tcp_states.h> /* for TCP_TIME_WAIT */
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables_core.h>
#include <net/netfilter/nft_meta.h>
#include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
struct nft_meta {
enum nft_meta_keys key:8;
union {
enum nft_registers dreg:8;
enum nft_registers sreg:8;
};
};
static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);
#ifdef CONFIG_NF_TABLES_BRIDGE
#include "../bridge/br_private.h"
#endif
void nft_meta_get_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
@ -47,9 +36,6 @@ void nft_meta_get_eval(const struct nft_expr *expr,
const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
struct sock *sk;
u32 *dest = &regs->data[priv->dreg];
#ifdef CONFIG_NF_TABLES_BRIDGE
const struct net_bridge_port *p;
#endif
switch (priv->key) {
case NFT_META_LEN:
@ -228,18 +214,6 @@ void nft_meta_get_eval(const struct nft_expr *expr,
case NFT_META_SECPATH:
nft_reg_store8(dest, secpath_exists(skb));
break;
#endif
#ifdef CONFIG_NF_TABLES_BRIDGE
case NFT_META_BRI_IIFNAME:
if (in == NULL || (p = br_port_get_rcu(in)) == NULL)
goto err;
strncpy((char *)dest, p->br->dev->name, IFNAMSIZ);
return;
case NFT_META_BRI_OIFNAME:
if (out == NULL || (p = br_port_get_rcu(out)) == NULL)
goto err;
strncpy((char *)dest, p->br->dev->name, IFNAMSIZ);
return;
#endif
case NFT_META_IIFKIND:
if (in == NULL || in->rtnl_link_ops == NULL)
@ -260,10 +234,11 @@ void nft_meta_get_eval(const struct nft_expr *expr,
err:
regs->verdict.code = NFT_BREAK;
}
EXPORT_SYMBOL_GPL(nft_meta_get_eval);
static void nft_meta_set_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
void nft_meta_set_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
const struct nft_meta *meta = nft_expr_priv(expr);
struct sk_buff *skb = pkt->skb;
@ -300,16 +275,18 @@ static void nft_meta_set_eval(const struct nft_expr *expr,
WARN_ON(1);
}
}
EXPORT_SYMBOL_GPL(nft_meta_set_eval);
static const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
[NFTA_META_DREG] = { .type = NLA_U32 },
[NFTA_META_KEY] = { .type = NLA_U32 },
[NFTA_META_SREG] = { .type = NLA_U32 },
};
EXPORT_SYMBOL_GPL(nft_meta_policy);
static int nft_meta_get_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
int nft_meta_get_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_meta *priv = nft_expr_priv(expr);
unsigned int len;
@ -359,14 +336,6 @@ static int nft_meta_get_init(const struct nft_ctx *ctx,
case NFT_META_SECPATH:
len = sizeof(u8);
break;
#endif
#ifdef CONFIG_NF_TABLES_BRIDGE
case NFT_META_BRI_IIFNAME:
case NFT_META_BRI_OIFNAME:
if (ctx->family != NFPROTO_BRIDGE)
return -EOPNOTSUPP;
len = IFNAMSIZ;
break;
#endif
default:
return -EOPNOTSUPP;
@ -376,6 +345,7 @@ static int nft_meta_get_init(const struct nft_ctx *ctx,
return nft_validate_register_store(ctx, priv->dreg, NULL,
NFT_DATA_VALUE, len);
}
EXPORT_SYMBOL_GPL(nft_meta_get_init);
static int nft_meta_get_validate(const struct nft_ctx *ctx,
const struct nft_expr *expr,
@ -409,9 +379,9 @@ static int nft_meta_get_validate(const struct nft_ctx *ctx,
#endif
}
static int nft_meta_set_validate(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nft_data **data)
int nft_meta_set_validate(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nft_data **data)
{
struct nft_meta *priv = nft_expr_priv(expr);
unsigned int hooks;
@ -437,10 +407,11 @@ static int nft_meta_set_validate(const struct nft_ctx *ctx,
return nft_chain_validate_hooks(ctx->chain, hooks);
}
EXPORT_SYMBOL_GPL(nft_meta_set_validate);
static int nft_meta_set_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
int nft_meta_set_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_meta *priv = nft_expr_priv(expr);
unsigned int len;
@ -475,9 +446,10 @@ static int nft_meta_set_init(const struct nft_ctx *ctx,
return 0;
}
EXPORT_SYMBOL_GPL(nft_meta_set_init);
static int nft_meta_get_dump(struct sk_buff *skb,
const struct nft_expr *expr)
int nft_meta_get_dump(struct sk_buff *skb,
const struct nft_expr *expr)
{
const struct nft_meta *priv = nft_expr_priv(expr);
@ -490,8 +462,9 @@ static int nft_meta_get_dump(struct sk_buff *skb,
nla_put_failure:
return -1;
}
EXPORT_SYMBOL_GPL(nft_meta_get_dump);
static int nft_meta_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
int nft_meta_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_meta *priv = nft_expr_priv(expr);
@ -505,15 +478,17 @@ static int nft_meta_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
nla_put_failure:
return -1;
}
EXPORT_SYMBOL_GPL(nft_meta_set_dump);
static void nft_meta_set_destroy(const struct nft_ctx *ctx,
const struct nft_expr *expr)
void nft_meta_set_destroy(const struct nft_ctx *ctx,
const struct nft_expr *expr)
{
const struct nft_meta *priv = nft_expr_priv(expr);
if (priv->key == NFT_META_NFTRACE)
static_branch_dec(&nft_trace_enabled);
}
EXPORT_SYMBOL_GPL(nft_meta_set_destroy);
static const struct nft_expr_ops nft_meta_get_ops = {
.type = &nft_meta_type,