![Patrick McHardy](/assets/img/avatar_default.png)
The key was missing in the list of valid keys, add it. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
410 lines
9 KiB
C
410 lines
9 KiB
C
/*
|
|
* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
|
|
*
|
|
* 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.
|
|
*
|
|
* 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.h>
|
|
#include <net/netfilter/nf_conntrack.h>
|
|
#include <net/netfilter/nf_conntrack_tuple.h>
|
|
#include <net/netfilter/nf_conntrack_helper.h>
|
|
#include <net/netfilter/nf_conntrack_ecache.h>
|
|
|
|
struct nft_ct {
|
|
enum nft_ct_keys key:8;
|
|
enum ip_conntrack_dir dir:8;
|
|
union{
|
|
enum nft_registers dreg:8;
|
|
enum nft_registers sreg:8;
|
|
};
|
|
uint8_t family;
|
|
};
|
|
|
|
static void nft_ct_get_eval(const struct nft_expr *expr,
|
|
struct nft_data data[NFT_REG_MAX + 1],
|
|
const struct nft_pktinfo *pkt)
|
|
{
|
|
const struct nft_ct *priv = nft_expr_priv(expr);
|
|
struct nft_data *dest = &data[priv->dreg];
|
|
enum ip_conntrack_info ctinfo;
|
|
const struct nf_conn *ct;
|
|
const struct nf_conn_help *help;
|
|
const struct nf_conntrack_tuple *tuple;
|
|
const struct nf_conntrack_helper *helper;
|
|
long diff;
|
|
unsigned int state;
|
|
|
|
ct = nf_ct_get(pkt->skb, &ctinfo);
|
|
|
|
switch (priv->key) {
|
|
case NFT_CT_STATE:
|
|
if (ct == NULL)
|
|
state = NF_CT_STATE_INVALID_BIT;
|
|
else if (nf_ct_is_untracked(ct))
|
|
state = NF_CT_STATE_UNTRACKED_BIT;
|
|
else
|
|
state = NF_CT_STATE_BIT(ctinfo);
|
|
dest->data[0] = state;
|
|
return;
|
|
}
|
|
|
|
if (ct == NULL)
|
|
goto err;
|
|
|
|
switch (priv->key) {
|
|
case NFT_CT_DIRECTION:
|
|
dest->data[0] = CTINFO2DIR(ctinfo);
|
|
return;
|
|
case NFT_CT_STATUS:
|
|
dest->data[0] = ct->status;
|
|
return;
|
|
#ifdef CONFIG_NF_CONNTRACK_MARK
|
|
case NFT_CT_MARK:
|
|
dest->data[0] = ct->mark;
|
|
return;
|
|
#endif
|
|
#ifdef CONFIG_NF_CONNTRACK_SECMARK
|
|
case NFT_CT_SECMARK:
|
|
dest->data[0] = ct->secmark;
|
|
return;
|
|
#endif
|
|
case NFT_CT_EXPIRATION:
|
|
diff = (long)jiffies - (long)ct->timeout.expires;
|
|
if (diff < 0)
|
|
diff = 0;
|
|
dest->data[0] = jiffies_to_msecs(diff);
|
|
return;
|
|
case NFT_CT_HELPER:
|
|
if (ct->master == NULL)
|
|
goto err;
|
|
help = nfct_help(ct->master);
|
|
if (help == NULL)
|
|
goto err;
|
|
helper = rcu_dereference(help->helper);
|
|
if (helper == NULL)
|
|
goto err;
|
|
if (strlen(helper->name) >= sizeof(dest->data))
|
|
goto err;
|
|
strncpy((char *)dest->data, helper->name, sizeof(dest->data));
|
|
return;
|
|
}
|
|
|
|
tuple = &ct->tuplehash[priv->dir].tuple;
|
|
switch (priv->key) {
|
|
case NFT_CT_L3PROTOCOL:
|
|
dest->data[0] = nf_ct_l3num(ct);
|
|
return;
|
|
case NFT_CT_SRC:
|
|
memcpy(dest->data, tuple->src.u3.all,
|
|
nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
|
|
return;
|
|
case NFT_CT_DST:
|
|
memcpy(dest->data, tuple->dst.u3.all,
|
|
nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
|
|
return;
|
|
case NFT_CT_PROTOCOL:
|
|
dest->data[0] = nf_ct_protonum(ct);
|
|
return;
|
|
case NFT_CT_PROTO_SRC:
|
|
dest->data[0] = (__force __u16)tuple->src.u.all;
|
|
return;
|
|
case NFT_CT_PROTO_DST:
|
|
dest->data[0] = (__force __u16)tuple->dst.u.all;
|
|
return;
|
|
}
|
|
return;
|
|
err:
|
|
data[NFT_REG_VERDICT].verdict = NFT_BREAK;
|
|
}
|
|
|
|
static void nft_ct_set_eval(const struct nft_expr *expr,
|
|
struct nft_data data[NFT_REG_MAX + 1],
|
|
const struct nft_pktinfo *pkt)
|
|
{
|
|
const struct nft_ct *priv = nft_expr_priv(expr);
|
|
struct sk_buff *skb = pkt->skb;
|
|
#ifdef CONFIG_NF_CONNTRACK_MARK
|
|
u32 value = data[priv->sreg].data[0];
|
|
#endif
|
|
enum ip_conntrack_info ctinfo;
|
|
struct nf_conn *ct;
|
|
|
|
ct = nf_ct_get(skb, &ctinfo);
|
|
if (ct == NULL)
|
|
return;
|
|
|
|
switch (priv->key) {
|
|
#ifdef CONFIG_NF_CONNTRACK_MARK
|
|
case NFT_CT_MARK:
|
|
if (ct->mark != value) {
|
|
ct->mark = value;
|
|
nf_conntrack_event_cache(IPCT_MARK, ct);
|
|
}
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
static const struct nla_policy nft_ct_policy[NFTA_CT_MAX + 1] = {
|
|
[NFTA_CT_DREG] = { .type = NLA_U32 },
|
|
[NFTA_CT_KEY] = { .type = NLA_U32 },
|
|
[NFTA_CT_DIRECTION] = { .type = NLA_U8 },
|
|
[NFTA_CT_SREG] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int nft_ct_l3proto_try_module_get(uint8_t family)
|
|
{
|
|
int err;
|
|
|
|
if (family == NFPROTO_INET) {
|
|
err = nf_ct_l3proto_try_module_get(NFPROTO_IPV4);
|
|
if (err < 0)
|
|
goto err1;
|
|
err = nf_ct_l3proto_try_module_get(NFPROTO_IPV6);
|
|
if (err < 0)
|
|
goto err2;
|
|
} else {
|
|
err = nf_ct_l3proto_try_module_get(family);
|
|
if (err < 0)
|
|
goto err1;
|
|
}
|
|
return 0;
|
|
|
|
err2:
|
|
nf_ct_l3proto_module_put(NFPROTO_IPV4);
|
|
err1:
|
|
return err;
|
|
}
|
|
|
|
static void nft_ct_l3proto_module_put(uint8_t family)
|
|
{
|
|
if (family == NFPROTO_INET) {
|
|
nf_ct_l3proto_module_put(NFPROTO_IPV4);
|
|
nf_ct_l3proto_module_put(NFPROTO_IPV6);
|
|
} else
|
|
nf_ct_l3proto_module_put(family);
|
|
}
|
|
|
|
static int nft_ct_init_validate_get(const struct nft_expr *expr,
|
|
const struct nlattr * const tb[])
|
|
{
|
|
struct nft_ct *priv = nft_expr_priv(expr);
|
|
|
|
if (tb[NFTA_CT_DIRECTION] != NULL) {
|
|
priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
|
|
switch (priv->dir) {
|
|
case IP_CT_DIR_ORIGINAL:
|
|
case IP_CT_DIR_REPLY:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
switch (priv->key) {
|
|
case NFT_CT_STATE:
|
|
case NFT_CT_DIRECTION:
|
|
case NFT_CT_STATUS:
|
|
#ifdef CONFIG_NF_CONNTRACK_MARK
|
|
case NFT_CT_MARK:
|
|
#endif
|
|
#ifdef CONFIG_NF_CONNTRACK_SECMARK
|
|
case NFT_CT_SECMARK:
|
|
#endif
|
|
case NFT_CT_EXPIRATION:
|
|
case NFT_CT_HELPER:
|
|
if (tb[NFTA_CT_DIRECTION] != NULL)
|
|
return -EINVAL;
|
|
break;
|
|
case NFT_CT_L3PROTOCOL:
|
|
case NFT_CT_PROTOCOL:
|
|
case NFT_CT_SRC:
|
|
case NFT_CT_DST:
|
|
case NFT_CT_PROTO_SRC:
|
|
case NFT_CT_PROTO_DST:
|
|
if (tb[NFTA_CT_DIRECTION] == NULL)
|
|
return -EINVAL;
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_ct_init_validate_set(uint32_t key)
|
|
{
|
|
switch (key) {
|
|
case NFT_CT_MARK:
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_ct_init(const struct nft_ctx *ctx,
|
|
const struct nft_expr *expr,
|
|
const struct nlattr * const tb[])
|
|
{
|
|
struct nft_ct *priv = nft_expr_priv(expr);
|
|
int err;
|
|
|
|
priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
|
|
|
|
if (tb[NFTA_CT_DREG]) {
|
|
err = nft_ct_init_validate_get(expr, tb);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
priv->dreg = ntohl(nla_get_be32(tb[NFTA_CT_DREG]));
|
|
err = nft_validate_output_register(priv->dreg);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = nft_validate_data_load(ctx, priv->dreg, NULL,
|
|
NFT_DATA_VALUE);
|
|
if (err < 0)
|
|
return err;
|
|
} else {
|
|
err = nft_ct_init_validate_set(priv->key);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
priv->sreg = ntohl(nla_get_be32(tb[NFTA_CT_SREG]));
|
|
err = nft_validate_input_register(priv->sreg);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
err = nft_ct_l3proto_try_module_get(ctx->afi->family);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
priv->family = ctx->afi->family;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nft_ct_destroy(const struct nft_expr *expr)
|
|
{
|
|
struct nft_ct *priv = nft_expr_priv(expr);
|
|
|
|
nft_ct_l3proto_module_put(priv->family);
|
|
}
|
|
|
|
static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr)
|
|
{
|
|
const struct nft_ct *priv = nft_expr_priv(expr);
|
|
|
|
if (nla_put_be32(skb, NFTA_CT_DREG, htonl(priv->dreg)))
|
|
goto nla_put_failure;
|
|
if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
|
|
goto nla_put_failure;
|
|
|
|
switch (priv->key) {
|
|
case NFT_CT_PROTOCOL:
|
|
case NFT_CT_SRC:
|
|
case NFT_CT_DST:
|
|
case NFT_CT_PROTO_SRC:
|
|
case NFT_CT_PROTO_DST:
|
|
if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
|
|
goto nla_put_failure;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
|
|
{
|
|
const struct nft_ct *priv = nft_expr_priv(expr);
|
|
|
|
if (nla_put_be32(skb, NFTA_CT_SREG, htonl(priv->sreg)))
|
|
goto nla_put_failure;
|
|
if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
|
|
goto nla_put_failure;
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static struct nft_expr_type nft_ct_type;
|
|
static const struct nft_expr_ops nft_ct_get_ops = {
|
|
.type = &nft_ct_type,
|
|
.size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
|
|
.eval = nft_ct_get_eval,
|
|
.init = nft_ct_init,
|
|
.destroy = nft_ct_destroy,
|
|
.dump = nft_ct_get_dump,
|
|
};
|
|
|
|
static const struct nft_expr_ops nft_ct_set_ops = {
|
|
.type = &nft_ct_type,
|
|
.size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
|
|
.eval = nft_ct_set_eval,
|
|
.init = nft_ct_init,
|
|
.destroy = nft_ct_destroy,
|
|
.dump = nft_ct_set_dump,
|
|
};
|
|
|
|
static const struct nft_expr_ops *
|
|
nft_ct_select_ops(const struct nft_ctx *ctx,
|
|
const struct nlattr * const tb[])
|
|
{
|
|
if (tb[NFTA_CT_KEY] == NULL)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (tb[NFTA_CT_DREG] && tb[NFTA_CT_SREG])
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (tb[NFTA_CT_DREG])
|
|
return &nft_ct_get_ops;
|
|
|
|
if (tb[NFTA_CT_SREG])
|
|
return &nft_ct_set_ops;
|
|
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static struct nft_expr_type nft_ct_type __read_mostly = {
|
|
.name = "ct",
|
|
.select_ops = &nft_ct_select_ops,
|
|
.policy = nft_ct_policy,
|
|
.maxattr = NFTA_CT_MAX,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init nft_ct_module_init(void)
|
|
{
|
|
return nft_register_expr(&nft_ct_type);
|
|
}
|
|
|
|
static void __exit nft_ct_module_exit(void)
|
|
{
|
|
nft_unregister_expr(&nft_ct_type);
|
|
}
|
|
|
|
module_init(nft_ct_module_init);
|
|
module_exit(nft_ct_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
|
|
MODULE_ALIAS_NFT_EXPR("ct");
|