mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Phil Sutter](/assets/img/avatar_default.png)
Add a 'reset' flag just like with nft_object_ops::dump. This will be useful to reset "anonymous stateful objects", e.g. simple rule counters. No functional change intended. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
295 lines
7.4 KiB
C
295 lines
7.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org>
|
|
*/
|
|
|
|
#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_nat.h>
|
|
#include <net/netfilter/nf_nat_redirect.h>
|
|
#include <net/netfilter/nf_tables.h>
|
|
|
|
struct nft_redir {
|
|
u8 sreg_proto_min;
|
|
u8 sreg_proto_max;
|
|
u16 flags;
|
|
};
|
|
|
|
static const struct nla_policy nft_redir_policy[NFTA_REDIR_MAX + 1] = {
|
|
[NFTA_REDIR_REG_PROTO_MIN] = { .type = NLA_U32 },
|
|
[NFTA_REDIR_REG_PROTO_MAX] = { .type = NLA_U32 },
|
|
[NFTA_REDIR_FLAGS] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int nft_redir_validate(const struct nft_ctx *ctx,
|
|
const struct nft_expr *expr,
|
|
const struct nft_data **data)
|
|
{
|
|
int err;
|
|
|
|
err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return nft_chain_validate_hooks(ctx->chain,
|
|
(1 << NF_INET_PRE_ROUTING) |
|
|
(1 << NF_INET_LOCAL_OUT));
|
|
}
|
|
|
|
static int nft_redir_init(const struct nft_ctx *ctx,
|
|
const struct nft_expr *expr,
|
|
const struct nlattr * const tb[])
|
|
{
|
|
struct nft_redir *priv = nft_expr_priv(expr);
|
|
unsigned int plen;
|
|
int err;
|
|
|
|
plen = sizeof_field(struct nf_nat_range, min_addr.all);
|
|
if (tb[NFTA_REDIR_REG_PROTO_MIN]) {
|
|
err = nft_parse_register_load(tb[NFTA_REDIR_REG_PROTO_MIN],
|
|
&priv->sreg_proto_min, plen);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (tb[NFTA_REDIR_REG_PROTO_MAX]) {
|
|
err = nft_parse_register_load(tb[NFTA_REDIR_REG_PROTO_MAX],
|
|
&priv->sreg_proto_max,
|
|
plen);
|
|
if (err < 0)
|
|
return err;
|
|
} else {
|
|
priv->sreg_proto_max = priv->sreg_proto_min;
|
|
}
|
|
}
|
|
|
|
if (tb[NFTA_REDIR_FLAGS]) {
|
|
priv->flags = ntohl(nla_get_be32(tb[NFTA_REDIR_FLAGS]));
|
|
if (priv->flags & ~NF_NAT_RANGE_MASK)
|
|
return -EINVAL;
|
|
}
|
|
|
|
return nf_ct_netns_get(ctx->net, ctx->family);
|
|
}
|
|
|
|
static int nft_redir_dump(struct sk_buff *skb,
|
|
const struct nft_expr *expr, bool reset)
|
|
{
|
|
const struct nft_redir *priv = nft_expr_priv(expr);
|
|
|
|
if (priv->sreg_proto_min) {
|
|
if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MIN,
|
|
priv->sreg_proto_min))
|
|
goto nla_put_failure;
|
|
if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MAX,
|
|
priv->sreg_proto_max))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
if (priv->flags != 0 &&
|
|
nla_put_be32(skb, NFTA_REDIR_FLAGS, htonl(priv->flags)))
|
|
goto nla_put_failure;
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static void nft_redir_ipv4_eval(const struct nft_expr *expr,
|
|
struct nft_regs *regs,
|
|
const struct nft_pktinfo *pkt)
|
|
{
|
|
struct nft_redir *priv = nft_expr_priv(expr);
|
|
struct nf_nat_ipv4_multi_range_compat mr;
|
|
|
|
memset(&mr, 0, sizeof(mr));
|
|
if (priv->sreg_proto_min) {
|
|
mr.range[0].min.all = (__force __be16)nft_reg_load16(
|
|
®s->data[priv->sreg_proto_min]);
|
|
mr.range[0].max.all = (__force __be16)nft_reg_load16(
|
|
®s->data[priv->sreg_proto_max]);
|
|
mr.range[0].flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
|
|
}
|
|
|
|
mr.range[0].flags |= priv->flags;
|
|
|
|
regs->verdict.code = nf_nat_redirect_ipv4(pkt->skb, &mr, nft_hook(pkt));
|
|
}
|
|
|
|
static void
|
|
nft_redir_ipv4_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
|
|
{
|
|
nf_ct_netns_put(ctx->net, NFPROTO_IPV4);
|
|
}
|
|
|
|
static struct nft_expr_type nft_redir_ipv4_type;
|
|
static const struct nft_expr_ops nft_redir_ipv4_ops = {
|
|
.type = &nft_redir_ipv4_type,
|
|
.size = NFT_EXPR_SIZE(sizeof(struct nft_redir)),
|
|
.eval = nft_redir_ipv4_eval,
|
|
.init = nft_redir_init,
|
|
.destroy = nft_redir_ipv4_destroy,
|
|
.dump = nft_redir_dump,
|
|
.validate = nft_redir_validate,
|
|
.reduce = NFT_REDUCE_READONLY,
|
|
};
|
|
|
|
static struct nft_expr_type nft_redir_ipv4_type __read_mostly = {
|
|
.family = NFPROTO_IPV4,
|
|
.name = "redir",
|
|
.ops = &nft_redir_ipv4_ops,
|
|
.policy = nft_redir_policy,
|
|
.maxattr = NFTA_REDIR_MAX,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
#ifdef CONFIG_NF_TABLES_IPV6
|
|
static void nft_redir_ipv6_eval(const struct nft_expr *expr,
|
|
struct nft_regs *regs,
|
|
const struct nft_pktinfo *pkt)
|
|
{
|
|
struct nft_redir *priv = nft_expr_priv(expr);
|
|
struct nf_nat_range2 range;
|
|
|
|
memset(&range, 0, sizeof(range));
|
|
if (priv->sreg_proto_min) {
|
|
range.min_proto.all = (__force __be16)nft_reg_load16(
|
|
®s->data[priv->sreg_proto_min]);
|
|
range.max_proto.all = (__force __be16)nft_reg_load16(
|
|
®s->data[priv->sreg_proto_max]);
|
|
range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
|
|
}
|
|
|
|
range.flags |= priv->flags;
|
|
|
|
regs->verdict.code =
|
|
nf_nat_redirect_ipv6(pkt->skb, &range, nft_hook(pkt));
|
|
}
|
|
|
|
static void
|
|
nft_redir_ipv6_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
|
|
{
|
|
nf_ct_netns_put(ctx->net, NFPROTO_IPV6);
|
|
}
|
|
|
|
static struct nft_expr_type nft_redir_ipv6_type;
|
|
static const struct nft_expr_ops nft_redir_ipv6_ops = {
|
|
.type = &nft_redir_ipv6_type,
|
|
.size = NFT_EXPR_SIZE(sizeof(struct nft_redir)),
|
|
.eval = nft_redir_ipv6_eval,
|
|
.init = nft_redir_init,
|
|
.destroy = nft_redir_ipv6_destroy,
|
|
.dump = nft_redir_dump,
|
|
.validate = nft_redir_validate,
|
|
.reduce = NFT_REDUCE_READONLY,
|
|
};
|
|
|
|
static struct nft_expr_type nft_redir_ipv6_type __read_mostly = {
|
|
.family = NFPROTO_IPV6,
|
|
.name = "redir",
|
|
.ops = &nft_redir_ipv6_ops,
|
|
.policy = nft_redir_policy,
|
|
.maxattr = NFTA_REDIR_MAX,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_NF_TABLES_INET
|
|
static void nft_redir_inet_eval(const struct nft_expr *expr,
|
|
struct nft_regs *regs,
|
|
const struct nft_pktinfo *pkt)
|
|
{
|
|
switch (nft_pf(pkt)) {
|
|
case NFPROTO_IPV4:
|
|
return nft_redir_ipv4_eval(expr, regs, pkt);
|
|
case NFPROTO_IPV6:
|
|
return nft_redir_ipv6_eval(expr, regs, pkt);
|
|
}
|
|
|
|
WARN_ON_ONCE(1);
|
|
}
|
|
|
|
static void
|
|
nft_redir_inet_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
|
|
{
|
|
nf_ct_netns_put(ctx->net, NFPROTO_INET);
|
|
}
|
|
|
|
static struct nft_expr_type nft_redir_inet_type;
|
|
static const struct nft_expr_ops nft_redir_inet_ops = {
|
|
.type = &nft_redir_inet_type,
|
|
.size = NFT_EXPR_SIZE(sizeof(struct nft_redir)),
|
|
.eval = nft_redir_inet_eval,
|
|
.init = nft_redir_init,
|
|
.destroy = nft_redir_inet_destroy,
|
|
.dump = nft_redir_dump,
|
|
.validate = nft_redir_validate,
|
|
.reduce = NFT_REDUCE_READONLY,
|
|
};
|
|
|
|
static struct nft_expr_type nft_redir_inet_type __read_mostly = {
|
|
.family = NFPROTO_INET,
|
|
.name = "redir",
|
|
.ops = &nft_redir_inet_ops,
|
|
.policy = nft_redir_policy,
|
|
.maxattr = NFTA_MASQ_MAX,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init nft_redir_module_init_inet(void)
|
|
{
|
|
return nft_register_expr(&nft_redir_inet_type);
|
|
}
|
|
#else
|
|
static inline int nft_redir_module_init_inet(void) { return 0; }
|
|
#endif
|
|
|
|
static int __init nft_redir_module_init(void)
|
|
{
|
|
int ret = nft_register_expr(&nft_redir_ipv4_type);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
#ifdef CONFIG_NF_TABLES_IPV6
|
|
ret = nft_register_expr(&nft_redir_ipv6_type);
|
|
if (ret) {
|
|
nft_unregister_expr(&nft_redir_ipv4_type);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
ret = nft_redir_module_init_inet();
|
|
if (ret < 0) {
|
|
nft_unregister_expr(&nft_redir_ipv4_type);
|
|
#ifdef CONFIG_NF_TABLES_IPV6
|
|
nft_unregister_expr(&nft_redir_ipv6_type);
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit nft_redir_module_exit(void)
|
|
{
|
|
nft_unregister_expr(&nft_redir_ipv4_type);
|
|
#ifdef CONFIG_NF_TABLES_IPV6
|
|
nft_unregister_expr(&nft_redir_ipv6_type);
|
|
#endif
|
|
#ifdef CONFIG_NF_TABLES_INET
|
|
nft_unregister_expr(&nft_redir_inet_type);
|
|
#endif
|
|
}
|
|
|
|
module_init(nft_redir_module_init);
|
|
module_exit(nft_redir_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>");
|
|
MODULE_ALIAS_NFT_EXPR("redir");
|
|
MODULE_DESCRIPTION("Netfilter nftables redirect support");
|