mirror of https://gitee.com/openkylin/linux.git
netfilter: nf_tables: Add support for IPv6 NAT
This patch generalizes the NAT expression to support both IPv4 and IPv6 using the existing IPv4/IPv6 NAT infrastructure. This also adds the NAT chain type for IPv6. This patch collapses the following patches that were posted to the netfilter-devel mailing list, from Tomasz: * nf_tables: Change NFTA_NAT_ attributes to better semantic significance * nf_tables: Split IPv4 NAT into NAT expression and IPv4 NAT chain * nf_tables: Add support for IPv6 NAT expression * nf_tables: Add support for IPv6 NAT chain * nf_tables: Fix up build issue on IPv6 NAT support And, from Pablo Neira Ayuso: * fix missing dependencies in nft_chain_nat Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Tomasz Bursztyka
Pablo Neira Ayuso
parent
9ddf632357
commit
eb31628e37
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@ -695,18 +695,20 @@ enum nft_nat_types {
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* enum nft_nat_attributes - nf_tables nat expression netlink attributes
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*
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* @NFTA_NAT_TYPE: NAT type (NLA_U32: nft_nat_types)
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* @NFTA_NAT_ADDR_MIN: source register of address range start (NLA_U32: nft_registers)
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* @NFTA_NAT_ADDR_MAX: source register of address range end (NLA_U32: nft_registers)
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* @NFTA_NAT_PROTO_MIN: source register of proto range start (NLA_U32: nft_registers)
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* @NFTA_NAT_PROTO_MAX: source register of proto range end (NLA_U32: nft_registers)
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* @NFTA_NAT_FAMILY: NAT family (NLA_U32)
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* @NFTA_NAT_REG_ADDR_MIN: source register of address range start (NLA_U32: nft_registers)
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* @NFTA_NAT_REG_ADDR_MAX: source register of address range end (NLA_U32: nft_registers)
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* @NFTA_NAT_REG_PROTO_MIN: source register of proto range start (NLA_U32: nft_registers)
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* @NFTA_NAT_REG_PROTO_MAX: source register of proto range end (NLA_U32: nft_registers)
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*/
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enum nft_nat_attributes {
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NFTA_NAT_UNSPEC,
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NFTA_NAT_TYPE,
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NFTA_NAT_ADDR_MIN,
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NFTA_NAT_ADDR_MAX,
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NFTA_NAT_PROTO_MIN,
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NFTA_NAT_PROTO_MAX,
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NFTA_NAT_FAMILY,
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NFTA_NAT_REG_ADDR_MIN,
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NFTA_NAT_REG_ADDR_MAX,
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NFTA_NAT_REG_PROTO_MIN,
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NFTA_NAT_REG_PROTO_MAX,
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__NFTA_NAT_MAX
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};
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#define NFTA_NAT_MAX (__NFTA_NAT_MAX - 1)
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@ -50,6 +50,7 @@ config NFT_CHAIN_ROUTE_IPV4
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config NFT_CHAIN_NAT_IPV4
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depends on NF_TABLES_IPV4
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depends on NF_NAT_IPV4 && NFT_NAT
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tristate "IPv4 nf_tables nat chain support"
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config IP_NF_IPTABLES
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@ -1,6 +1,7 @@
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/*
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* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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* Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
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* Copyright (c) 2012 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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@ -14,10 +15,8 @@
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#include <linux/list.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_nat.h>
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@ -27,147 +26,6 @@
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#include <net/netfilter/nf_nat_l3proto.h>
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#include <net/ip.h>
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struct nft_nat {
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enum nft_registers sreg_addr_min:8;
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enum nft_registers sreg_addr_max:8;
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enum nft_registers sreg_proto_min:8;
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enum nft_registers sreg_proto_max:8;
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enum nf_nat_manip_type type;
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};
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static void nft_nat_eval(const struct nft_expr *expr,
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struct nft_data data[NFT_REG_MAX + 1],
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const struct nft_pktinfo *pkt)
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{
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const struct nft_nat *priv = nft_expr_priv(expr);
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enum ip_conntrack_info ctinfo;
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struct nf_conn *ct = nf_ct_get(pkt->skb, &ctinfo);
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struct nf_nat_range range;
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memset(&range, 0, sizeof(range));
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if (priv->sreg_addr_min) {
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range.min_addr.ip = data[priv->sreg_addr_min].data[0];
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range.max_addr.ip = data[priv->sreg_addr_max].data[0];
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range.flags |= NF_NAT_RANGE_MAP_IPS;
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}
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if (priv->sreg_proto_min) {
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range.min_proto.all = data[priv->sreg_proto_min].data[0];
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range.max_proto.all = data[priv->sreg_proto_max].data[0];
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range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
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}
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data[NFT_REG_VERDICT].verdict =
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nf_nat_setup_info(ct, &range, priv->type);
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}
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static const struct nla_policy nft_nat_policy[NFTA_NAT_MAX + 1] = {
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[NFTA_NAT_ADDR_MIN] = { .type = NLA_U32 },
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[NFTA_NAT_ADDR_MAX] = { .type = NLA_U32 },
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[NFTA_NAT_PROTO_MIN] = { .type = NLA_U32 },
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[NFTA_NAT_PROTO_MAX] = { .type = NLA_U32 },
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[NFTA_NAT_TYPE] = { .type = NLA_U32 },
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};
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static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_nat *priv = nft_expr_priv(expr);
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int err;
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if (tb[NFTA_NAT_TYPE] == NULL)
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return -EINVAL;
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switch (ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]))) {
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case NFT_NAT_SNAT:
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priv->type = NF_NAT_MANIP_SRC;
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break;
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case NFT_NAT_DNAT:
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priv->type = NF_NAT_MANIP_DST;
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break;
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default:
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return -EINVAL;
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}
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if (tb[NFTA_NAT_ADDR_MIN]) {
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priv->sreg_addr_min = ntohl(nla_get_be32(tb[NFTA_NAT_ADDR_MIN]));
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err = nft_validate_input_register(priv->sreg_addr_min);
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if (err < 0)
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return err;
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}
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if (tb[NFTA_NAT_ADDR_MAX]) {
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priv->sreg_addr_max = ntohl(nla_get_be32(tb[NFTA_NAT_ADDR_MAX]));
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err = nft_validate_input_register(priv->sreg_addr_max);
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if (err < 0)
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return err;
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} else
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priv->sreg_addr_max = priv->sreg_addr_min;
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if (tb[NFTA_NAT_PROTO_MIN]) {
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priv->sreg_proto_min = ntohl(nla_get_be32(tb[NFTA_NAT_PROTO_MIN]));
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err = nft_validate_input_register(priv->sreg_proto_min);
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if (err < 0)
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return err;
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}
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if (tb[NFTA_NAT_PROTO_MAX]) {
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priv->sreg_proto_max = ntohl(nla_get_be32(tb[NFTA_NAT_PROTO_MAX]));
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err = nft_validate_input_register(priv->sreg_proto_max);
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if (err < 0)
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return err;
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} else
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priv->sreg_proto_max = priv->sreg_proto_min;
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return 0;
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}
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static int nft_nat_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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const struct nft_nat *priv = nft_expr_priv(expr);
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switch (priv->type) {
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case NF_NAT_MANIP_SRC:
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if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT)))
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goto nla_put_failure;
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break;
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case NF_NAT_MANIP_DST:
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if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT)))
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goto nla_put_failure;
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break;
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}
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if (nla_put_be32(skb, NFTA_NAT_ADDR_MIN, htonl(priv->sreg_addr_min)))
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goto nla_put_failure;
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if (nla_put_be32(skb, NFTA_NAT_ADDR_MAX, htonl(priv->sreg_addr_max)))
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goto nla_put_failure;
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if (nla_put_be32(skb, NFTA_NAT_PROTO_MIN, htonl(priv->sreg_proto_min)))
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goto nla_put_failure;
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if (nla_put_be32(skb, NFTA_NAT_PROTO_MAX, htonl(priv->sreg_proto_max)))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -1;
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}
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static struct nft_expr_type nft_nat_type;
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static const struct nft_expr_ops nft_nat_ops = {
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.type = &nft_nat_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
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.eval = nft_nat_eval,
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.init = nft_nat_init,
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.dump = nft_nat_dump,
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};
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static struct nft_expr_type nft_nat_type __read_mostly = {
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.name = "nat",
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.ops = &nft_nat_ops,
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.policy = nft_nat_policy,
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.maxattr = NFTA_NAT_MAX,
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.owner = THIS_MODULE,
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};
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/*
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* NAT chains
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*/
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@ -306,7 +164,7 @@ static unsigned int nf_nat_output(const struct nf_hook_ops *ops,
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return ret;
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}
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struct nf_chain_type nft_chain_nat_ipv4 = {
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static struct nf_chain_type nft_chain_nat_ipv4 = {
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.family = NFPROTO_IPV4,
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.name = "nat",
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.type = NFT_CHAIN_T_NAT,
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@ -331,20 +189,11 @@ static int __init nft_chain_nat_init(void)
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if (err < 0)
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return err;
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err = nft_register_expr(&nft_nat_type);
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if (err < 0)
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goto err;
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return 0;
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err:
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nft_unregister_chain_type(&nft_chain_nat_ipv4);
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return err;
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}
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static void __exit nft_chain_nat_exit(void)
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{
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nft_unregister_expr(&nft_nat_type);
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nft_unregister_chain_type(&nft_chain_nat_ipv4);
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}
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@ -354,4 +203,3 @@ module_exit(nft_chain_nat_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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MODULE_ALIAS_NFT_CHAIN(AF_INET, "nat");
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MODULE_ALIAS_NFT_EXPR("nat");
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@ -33,6 +33,11 @@ config NFT_CHAIN_ROUTE_IPV6
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depends on NF_TABLES_IPV6
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tristate "IPv6 nf_tables route chain support"
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config NFT_CHAIN_NAT_IPV6
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depends on NF_TABLES_IPV6
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depends on NF_NAT_IPV6 && NFT_NAT
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tristate "IPv6 nf_tables nat chain support"
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config IP6_NF_IPTABLES
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tristate "IP6 tables support (required for filtering)"
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depends on INET && IPV6
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@ -26,6 +26,7 @@ obj-$(CONFIG_NF_DEFRAG_IPV6) += nf_defrag_ipv6.o
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# nf_tables
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obj-$(CONFIG_NF_TABLES_IPV6) += nf_tables_ipv6.o
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obj-$(CONFIG_NFT_CHAIN_ROUTE_IPV6) += nft_chain_route_ipv6.o
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obj-$(CONFIG_NFT_CHAIN_NAT_IPV6) += nft_chain_nat_ipv6.o
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# matches
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obj-$(CONFIG_IP6_NF_MATCH_AH) += ip6t_ah.o
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@ -0,0 +1,211 @@
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/*
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* Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
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* Copyright (c) 2012 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_nat.h>
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#include <net/netfilter/nf_nat_core.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables_ipv6.h>
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#include <net/netfilter/nf_nat_l3proto.h>
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#include <net/ipv6.h>
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/*
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* IPv6 NAT chains
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*/
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static unsigned int nf_nat_ipv6_fn(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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enum ip_conntrack_info ctinfo;
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struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
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struct nf_conn_nat *nat;
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enum nf_nat_manip_type maniptype = HOOK2MANIP(ops->hooknum);
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__be16 frag_off;
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int hdrlen;
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u8 nexthdr;
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struct nft_pktinfo pkt;
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unsigned int ret;
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if (ct == NULL || nf_ct_is_untracked(ct))
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return NF_ACCEPT;
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nat = nfct_nat(ct);
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if (nat == NULL) {
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/* Conntrack module was loaded late, can't add extension. */
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if (nf_ct_is_confirmed(ct))
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return NF_ACCEPT;
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nat = nf_ct_ext_add(ct, NF_CT_EXT_NAT, GFP_ATOMIC);
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if (nat == NULL)
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return NF_ACCEPT;
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}
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switch (ctinfo) {
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case IP_CT_RELATED:
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case IP_CT_RELATED + IP_CT_IS_REPLY:
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nexthdr = ipv6_hdr(skb)->nexthdr;
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hdrlen = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
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&nexthdr, &frag_off);
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if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
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if (!nf_nat_icmpv6_reply_translation(skb, ct, ctinfo,
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ops->hooknum,
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hdrlen))
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return NF_DROP;
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else
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return NF_ACCEPT;
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}
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/* Fall through */
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case IP_CT_NEW:
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if (nf_nat_initialized(ct, maniptype))
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break;
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nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out);
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ret = nft_do_chain_pktinfo(&pkt, ops);
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if (ret != NF_ACCEPT)
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return ret;
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if (!nf_nat_initialized(ct, maniptype)) {
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ret = nf_nat_alloc_null_binding(ct, ops->hooknum);
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if (ret != NF_ACCEPT)
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return ret;
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}
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default:
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break;
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}
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return nf_nat_packet(ct, ctinfo, ops->hooknum, skb);
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}
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static unsigned int nf_nat_ipv6_prerouting(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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struct in6_addr daddr = ipv6_hdr(skb)->daddr;
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unsigned int ret;
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ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
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if (ret != NF_DROP && ret != NF_STOLEN &&
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ipv6_addr_cmp(&daddr, &ipv6_hdr(skb)->daddr))
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skb_dst_drop(skb);
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return ret;
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}
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static unsigned int nf_nat_ipv6_postrouting(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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enum ip_conntrack_info ctinfo __maybe_unused;
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const struct nf_conn *ct __maybe_unused;
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unsigned int ret;
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ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
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#ifdef CONFIG_XFRM
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if (ret != NF_DROP && ret != NF_STOLEN &&
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!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
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(ct = nf_ct_get(skb, &ctinfo)) != NULL) {
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enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
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if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.src.u3,
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&ct->tuplehash[!dir].tuple.dst.u3) ||
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(ct->tuplehash[dir].tuple.src.u.all !=
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ct->tuplehash[!dir].tuple.dst.u.all))
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if (nf_xfrm_me_harder(skb, AF_INET6) < 0)
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ret = NF_DROP;
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}
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#endif
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return ret;
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}
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static unsigned int nf_nat_ipv6_output(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
int (*okfn)(struct sk_buff *))
|
||||
{
|
||||
enum ip_conntrack_info ctinfo;
|
||||
const struct nf_conn *ct;
|
||||
unsigned int ret;
|
||||
|
||||
ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
|
||||
if (ret != NF_DROP && ret != NF_STOLEN &&
|
||||
(ct = nf_ct_get(skb, &ctinfo)) != NULL) {
|
||||
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
||||
|
||||
if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.dst.u3,
|
||||
&ct->tuplehash[!dir].tuple.src.u3)) {
|
||||
if (ip6_route_me_harder(skb))
|
||||
ret = NF_DROP;
|
||||
}
|
||||
#ifdef CONFIG_XFRM
|
||||
else if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
|
||||
ct->tuplehash[dir].tuple.dst.u.all !=
|
||||
ct->tuplehash[!dir].tuple.src.u.all)
|
||||
if (nf_xfrm_me_harder(skb, AF_INET6))
|
||||
ret = NF_DROP;
|
||||
#endif
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct nf_chain_type nft_chain_nat_ipv6 = {
|
||||
.family = NFPROTO_IPV6,
|
||||
.name = "nat",
|
||||
.type = NFT_CHAIN_T_NAT,
|
||||
.hook_mask = (1 << NF_INET_PRE_ROUTING) |
|
||||
(1 << NF_INET_POST_ROUTING) |
|
||||
(1 << NF_INET_LOCAL_OUT) |
|
||||
(1 << NF_INET_LOCAL_IN),
|
||||
.fn = {
|
||||
[NF_INET_PRE_ROUTING] = nf_nat_ipv6_prerouting,
|
||||
[NF_INET_POST_ROUTING] = nf_nat_ipv6_postrouting,
|
||||
[NF_INET_LOCAL_OUT] = nf_nat_ipv6_output,
|
||||
[NF_INET_LOCAL_IN] = nf_nat_ipv6_fn,
|
||||
},
|
||||
.me = THIS_MODULE,
|
||||
};
|
||||
|
||||
static int __init nft_chain_nat_ipv6_init(void)
|
||||
{
|
||||
int err;
|
||||
|
||||
err = nft_register_chain_type(&nft_chain_nat_ipv6);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit nft_chain_nat_ipv6_exit(void)
|
||||
{
|
||||
nft_unregister_chain_type(&nft_chain_nat_ipv6);
|
||||
}
|
||||
|
||||
module_init(nft_chain_nat_ipv6_init);
|
||||
module_exit(nft_chain_nat_ipv6_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
|
||||
MODULE_ALIAS_NFT_CHAIN(AF_INET6, "nat");
|
||||
|
|
@ -450,6 +450,12 @@ config NFT_LIMIT
|
|||
depends on NF_TABLES
|
||||
tristate "Netfilter nf_tables limit module"
|
||||
|
||||
config NFT_NAT
|
||||
depends on NF_TABLES
|
||||
depends on NF_CONNTRACK
|
||||
depends on NF_NAT
|
||||
tristate "Netfilter nf_tables nat module"
|
||||
|
||||
config NFT_COMPAT
|
||||
depends on NF_TABLES
|
||||
depends on NETFILTER_XTABLES
|
||||
|
|
|
|||
|
|
@ -75,6 +75,7 @@ obj-$(CONFIG_NFT_EXTHDR) += nft_exthdr.o
|
|||
obj-$(CONFIG_NFT_META) += nft_meta.o
|
||||
obj-$(CONFIG_NFT_CT) += nft_ct.o
|
||||
obj-$(CONFIG_NFT_LIMIT) += nft_limit.o
|
||||
obj-$(CONFIG_NFT_NAT) += nft_nat.o
|
||||
#nf_tables-objs += nft_meta_target.o
|
||||
obj-$(CONFIG_NFT_RBTREE) += nft_rbtree.o
|
||||
obj-$(CONFIG_NFT_HASH) += nft_hash.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,220 @@
|
|||
/*
|
||||
* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
|
||||
* Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
|
||||
* Copyright (c) 2012 Intel Corporation
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms and conditions of the GNU General Public License,
|
||||
* version 2, as published by the Free Software Foundation.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/skbuff.h>
|
||||
#include <linux/ip.h>
|
||||
#include <linux/string.h>
|
||||
#include <linux/netlink.h>
|
||||
#include <linux/netfilter.h>
|
||||
#include <linux/netfilter_ipv4.h>
|
||||
#include <linux/netfilter/nfnetlink.h>
|
||||
#include <linux/netfilter/nf_tables.h>
|
||||
#include <net/netfilter/nf_conntrack.h>
|
||||
#include <net/netfilter/nf_nat.h>
|
||||
#include <net/netfilter/nf_nat_core.h>
|
||||
#include <net/netfilter/nf_tables.h>
|
||||
#include <net/netfilter/nf_nat_l3proto.h>
|
||||
#include <net/ip.h>
|
||||
|
||||
struct nft_nat {
|
||||
enum nft_registers sreg_addr_min:8;
|
||||
enum nft_registers sreg_addr_max:8;
|
||||
enum nft_registers sreg_proto_min:8;
|
||||
enum nft_registers sreg_proto_max:8;
|
||||
int family;
|
||||
enum nf_nat_manip_type type;
|
||||
};
|
||||
|
||||
static void nft_nat_eval(const struct nft_expr *expr,
|
||||
struct nft_data data[NFT_REG_MAX + 1],
|
||||
const struct nft_pktinfo *pkt)
|
||||
{
|
||||
const struct nft_nat *priv = nft_expr_priv(expr);
|
||||
enum ip_conntrack_info ctinfo;
|
||||
struct nf_conn *ct = nf_ct_get(pkt->skb, &ctinfo);
|
||||
struct nf_nat_range range;
|
||||
|
||||
memset(&range, 0, sizeof(range));
|
||||
if (priv->sreg_addr_min) {
|
||||
if (priv->family == AF_INET) {
|
||||
range.min_addr.ip = data[priv->sreg_addr_min].data[0];
|
||||
range.max_addr.ip = data[priv->sreg_addr_max].data[0];
|
||||
|
||||
} else {
|
||||
memcpy(range.min_addr.ip6,
|
||||
data[priv->sreg_addr_min].data,
|
||||
sizeof(struct nft_data));
|
||||
memcpy(range.max_addr.ip6,
|
||||
data[priv->sreg_addr_max].data,
|
||||
sizeof(struct nft_data));
|
||||
}
|
||||
range.flags |= NF_NAT_RANGE_MAP_IPS;
|
||||
}
|
||||
|
||||
if (priv->sreg_proto_min) {
|
||||
range.min_proto.all = data[priv->sreg_proto_min].data[0];
|
||||
range.max_proto.all = data[priv->sreg_proto_max].data[0];
|
||||
range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
|
||||
}
|
||||
|
||||
data[NFT_REG_VERDICT].verdict =
|
||||
nf_nat_setup_info(ct, &range, priv->type);
|
||||
}
|
||||
|
||||
static const struct nla_policy nft_nat_policy[NFTA_NAT_MAX + 1] = {
|
||||
[NFTA_NAT_TYPE] = { .type = NLA_U32 },
|
||||
[NFTA_NAT_FAMILY] = { .type = NLA_U32 },
|
||||
[NFTA_NAT_REG_ADDR_MIN] = { .type = NLA_U32 },
|
||||
[NFTA_NAT_REG_ADDR_MAX] = { .type = NLA_U32 },
|
||||
[NFTA_NAT_REG_PROTO_MIN] = { .type = NLA_U32 },
|
||||
[NFTA_NAT_REG_PROTO_MAX] = { .type = NLA_U32 },
|
||||
};
|
||||
|
||||
static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
|
||||
const struct nlattr * const tb[])
|
||||
{
|
||||
struct nft_nat *priv = nft_expr_priv(expr);
|
||||
int err;
|
||||
|
||||
if (tb[NFTA_NAT_TYPE] == NULL)
|
||||
return -EINVAL;
|
||||
|
||||
switch (ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]))) {
|
||||
case NFT_NAT_SNAT:
|
||||
priv->type = NF_NAT_MANIP_SRC;
|
||||
break;
|
||||
case NFT_NAT_DNAT:
|
||||
priv->type = NF_NAT_MANIP_DST;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (tb[NFTA_NAT_FAMILY] == NULL)
|
||||
return -EINVAL;
|
||||
|
||||
priv->family = ntohl(nla_get_be32(tb[NFTA_NAT_FAMILY]));
|
||||
if (priv->family != AF_INET && priv->family != AF_INET6)
|
||||
return -EINVAL;
|
||||
|
||||
if (tb[NFTA_NAT_REG_ADDR_MIN]) {
|
||||
priv->sreg_addr_min = ntohl(nla_get_be32(
|
||||
tb[NFTA_NAT_REG_ADDR_MIN]));
|
||||
err = nft_validate_input_register(priv->sreg_addr_min);
|
||||
if (err < 0)
|
||||
return err;
|
||||
}
|
||||
|
||||
if (tb[NFTA_NAT_REG_ADDR_MAX]) {
|
||||
priv->sreg_addr_max = ntohl(nla_get_be32(
|
||||
tb[NFTA_NAT_REG_ADDR_MAX]));
|
||||
err = nft_validate_input_register(priv->sreg_addr_max);
|
||||
if (err < 0)
|
||||
return err;
|
||||
} else
|
||||
priv->sreg_addr_max = priv->sreg_addr_min;
|
||||
|
||||
if (tb[NFTA_NAT_REG_PROTO_MIN]) {
|
||||
priv->sreg_proto_min = ntohl(nla_get_be32(
|
||||
tb[NFTA_NAT_REG_PROTO_MIN]));
|
||||
err = nft_validate_input_register(priv->sreg_proto_min);
|
||||
if (err < 0)
|
||||
return err;
|
||||
}
|
||||
|
||||
if (tb[NFTA_NAT_REG_PROTO_MAX]) {
|
||||
priv->sreg_proto_max = ntohl(nla_get_be32(
|
||||
tb[NFTA_NAT_REG_PROTO_MAX]));
|
||||
err = nft_validate_input_register(priv->sreg_proto_max);
|
||||
if (err < 0)
|
||||
return err;
|
||||
} else
|
||||
priv->sreg_proto_max = priv->sreg_proto_min;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nft_nat_dump(struct sk_buff *skb, const struct nft_expr *expr)
|
||||
{
|
||||
const struct nft_nat *priv = nft_expr_priv(expr);
|
||||
|
||||
switch (priv->type) {
|
||||
case NF_NAT_MANIP_SRC:
|
||||
if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT)))
|
||||
goto nla_put_failure;
|
||||
break;
|
||||
case NF_NAT_MANIP_DST:
|
||||
if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT)))
|
||||
goto nla_put_failure;
|
||||
break;
|
||||
}
|
||||
|
||||
if (nla_put_be32(skb, NFTA_NAT_FAMILY, htonl(priv->family)))
|
||||
goto nla_put_failure;
|
||||
if (nla_put_be32(skb,
|
||||
NFTA_NAT_REG_ADDR_MIN, htonl(priv->sreg_addr_min)))
|
||||
goto nla_put_failure;
|
||||
if (nla_put_be32(skb,
|
||||
NFTA_NAT_REG_ADDR_MAX, htonl(priv->sreg_addr_max)))
|
||||
goto nla_put_failure;
|
||||
if (nla_put_be32(skb,
|
||||
NFTA_NAT_REG_PROTO_MIN, htonl(priv->sreg_proto_min)))
|
||||
goto nla_put_failure;
|
||||
if (nla_put_be32(skb,
|
||||
NFTA_NAT_REG_PROTO_MAX, htonl(priv->sreg_proto_max)))
|
||||
goto nla_put_failure;
|
||||
return 0;
|
||||
|
||||
nla_put_failure:
|
||||
return -1;
|
||||
}
|
||||
|
||||
static struct nft_expr_type nft_nat_type;
|
||||
static const struct nft_expr_ops nft_nat_ops = {
|
||||
.type = &nft_nat_type,
|
||||
.size = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
|
||||
.eval = nft_nat_eval,
|
||||
.init = nft_nat_init,
|
||||
.dump = nft_nat_dump,
|
||||
};
|
||||
|
||||
static struct nft_expr_type nft_nat_type __read_mostly = {
|
||||
.name = "nat",
|
||||
.ops = &nft_nat_ops,
|
||||
.policy = nft_nat_policy,
|
||||
.maxattr = NFTA_NAT_MAX,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
static int __init nft_nat_module_init(void)
|
||||
{
|
||||
int err;
|
||||
|
||||
err = nft_register_expr(&nft_nat_type);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit nft_nat_module_exit(void)
|
||||
{
|
||||
nft_unregister_expr(&nft_nat_type);
|
||||
}
|
||||
|
||||
module_init(nft_nat_module_init);
|
||||
module_exit(nft_nat_module_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
|
||||
MODULE_ALIAS_NFT_EXPR("nat");
|
||||
Loading…
Reference in New Issue