263 lines
6.7 KiB
C
263 lines
6.7 KiB
C
/*
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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 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/skbuff.h>
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#include <linux/ip.h>
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#include <linux/string.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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#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_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:8;
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u8 family;
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u16 flags;
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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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if (priv->family == AF_INET) {
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range.min_addr.ip = (__force __be32)
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data[priv->sreg_addr_min].data[0];
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range.max_addr.ip = (__force __be32)
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data[priv->sreg_addr_max].data[0];
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} else {
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memcpy(range.min_addr.ip6,
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data[priv->sreg_addr_min].data,
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sizeof(struct nft_data));
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memcpy(range.max_addr.ip6,
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data[priv->sreg_addr_max].data,
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sizeof(struct nft_data));
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}
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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 = (__force __be16)
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data[priv->sreg_proto_min].data[0];
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range.max_proto.all = (__force __be16)
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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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range.flags |= priv->flags;
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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_TYPE] = { .type = NLA_U32 },
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[NFTA_NAT_FAMILY] = { .type = NLA_U32 },
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[NFTA_NAT_REG_ADDR_MIN] = { .type = NLA_U32 },
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[NFTA_NAT_REG_ADDR_MAX] = { .type = NLA_U32 },
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[NFTA_NAT_REG_PROTO_MIN] = { .type = NLA_U32 },
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[NFTA_NAT_REG_PROTO_MAX] = { .type = NLA_U32 },
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[NFTA_NAT_FLAGS] = { .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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u32 family;
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int err;
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err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT);
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if (err < 0)
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return err;
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if (tb[NFTA_NAT_TYPE] == NULL ||
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(tb[NFTA_NAT_REG_ADDR_MIN] == NULL &&
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tb[NFTA_NAT_REG_PROTO_MIN] == 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_FAMILY] == NULL)
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return -EINVAL;
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family = ntohl(nla_get_be32(tb[NFTA_NAT_FAMILY]));
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if (family != AF_INET && family != AF_INET6)
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return -EAFNOSUPPORT;
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if (family != ctx->afi->family)
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return -EOPNOTSUPP;
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priv->family = family;
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if (tb[NFTA_NAT_REG_ADDR_MIN]) {
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priv->sreg_addr_min =
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ntohl(nla_get_be32(tb[NFTA_NAT_REG_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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if (tb[NFTA_NAT_REG_ADDR_MAX]) {
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priv->sreg_addr_max =
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ntohl(nla_get_be32(tb[NFTA_NAT_REG_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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}
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}
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if (tb[NFTA_NAT_REG_PROTO_MIN]) {
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priv->sreg_proto_min =
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ntohl(nla_get_be32(tb[NFTA_NAT_REG_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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if (tb[NFTA_NAT_REG_PROTO_MAX]) {
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priv->sreg_proto_max =
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ntohl(nla_get_be32(tb[NFTA_NAT_REG_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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}
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}
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if (tb[NFTA_NAT_FLAGS]) {
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priv->flags = ntohl(nla_get_be32(tb[NFTA_NAT_FLAGS]));
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if (priv->flags & ~NF_NAT_RANGE_MASK)
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return -EINVAL;
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}
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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_FAMILY, htonl(priv->family)))
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goto nla_put_failure;
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if (priv->sreg_addr_min) {
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if (nla_put_be32(skb, NFTA_NAT_REG_ADDR_MIN,
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htonl(priv->sreg_addr_min)) ||
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nla_put_be32(skb, NFTA_NAT_REG_ADDR_MAX,
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htonl(priv->sreg_addr_max)))
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goto nla_put_failure;
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}
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if (priv->sreg_proto_min) {
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if (nla_put_be32(skb, NFTA_NAT_REG_PROTO_MIN,
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htonl(priv->sreg_proto_min)) ||
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nla_put_be32(skb, NFTA_NAT_REG_PROTO_MAX,
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htonl(priv->sreg_proto_max)))
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goto nla_put_failure;
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}
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if (priv->flags != 0) {
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if (nla_put_be32(skb, NFTA_NAT_FLAGS, htonl(priv->flags)))
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goto nla_put_failure;
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}
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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 int nft_nat_validate(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nft_data **data)
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{
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return nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT);
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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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.validate = nft_nat_validate,
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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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static int __init nft_nat_module_init(void)
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{
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return nft_register_expr(&nft_nat_type);
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}
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static void __exit nft_nat_module_exit(void)
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{
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nft_unregister_expr(&nft_nat_type);
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}
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module_init(nft_nat_module_init);
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module_exit(nft_nat_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
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MODULE_ALIAS_NFT_EXPR("nat");
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