// SPDX-License-Identifier: GPL-2.0-only
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/*
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* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
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* (C) 2011 Patrick McHardy <kaber@trash.net>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/x_tables.h>
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#include <net/netfilter/nf_nat.h>
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static int xt_nat_checkentry_v0(const struct xt_tgchk_param *par)
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{
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const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
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if (mr->rangesize != 1) {
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pr_info_ratelimited("multiple ranges no longer supported\n");
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return -EINVAL;
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}
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return nf_ct_netns_get(par->net, par->family);
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}
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static int xt_nat_checkentry(const struct xt_tgchk_param *par)
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{
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return nf_ct_netns_get(par->net, par->family);
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}
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static void xt_nat_destroy(const struct xt_tgdtor_param *par)
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{
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nf_ct_netns_put(par->net, par->family);
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}
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static void xt_nat_convert_range(struct nf_nat_range2 *dst,
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const struct nf_nat_ipv4_range *src)
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{
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memset(&dst->min_addr, 0, sizeof(dst->min_addr));
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memset(&dst->max_addr, 0, sizeof(dst->max_addr));
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memset(&dst->base_proto, 0, sizeof(dst->base_proto));
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dst->flags = src->flags;
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dst->min_addr.ip = src->min_ip;
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dst->max_addr.ip = src->max_ip;
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dst->min_proto = src->min;
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dst->max_proto = src->max;
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}
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static unsigned int
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xt_snat_target_v0(struct sk_buff *skb, const struct xt_action_param *par)
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{
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const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
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struct nf_nat_range2 range;
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enum ip_conntrack_info ctinfo;
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struct nf_conn *ct;
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ct = nf_ct_get(skb, &ctinfo);
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WARN_ON(!(ct != NULL &&
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(ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED ||
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ctinfo == IP_CT_RELATED_REPLY)));
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xt_nat_convert_range(&range, &mr->range[0]);
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return nf_nat_setup_info(ct, &range, NF_NAT_MANIP_SRC);
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}
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static unsigned int
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xt_dnat_target_v0(struct sk_buff *skb, const struct xt_action_param *par)
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{
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const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
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struct nf_nat_range2 range;
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enum ip_conntrack_info ctinfo;
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struct nf_conn *ct;
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ct = nf_ct_get(skb, &ctinfo);
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WARN_ON(!(ct != NULL &&
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(ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED)));
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xt_nat_convert_range(&range, &mr->range[0]);
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return nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST);
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}
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static unsigned int
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xt_snat_target_v1(struct sk_buff *skb, const struct xt_action_param *par)
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{
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const struct nf_nat_range *range_v1 = par->targinfo;
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struct nf_nat_range2 range;
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enum ip_conntrack_info ctinfo;
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struct nf_conn *ct;
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ct = nf_ct_get(skb, &ctinfo);
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WARN_ON(!(ct != NULL &&
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(ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED ||
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ctinfo == IP_CT_RELATED_REPLY)));
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memcpy(&range, range_v1, sizeof(*range_v1));
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memset(&range.base_proto, 0, sizeof(range.base_proto));
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return nf_nat_setup_info(ct, &range, NF_NAT_MANIP_SRC);
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}
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static unsigned int
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xt_dnat_target_v1(struct sk_buff *skb, const struct xt_action_param *par)
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{
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const struct nf_nat_range *range_v1 = par->targinfo;
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struct nf_nat_range2 range;
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enum ip_conntrack_info ctinfo;
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struct nf_conn *ct;
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ct = nf_ct_get(skb, &ctinfo);
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WARN_ON(!(ct != NULL &&
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(ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED)));
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memcpy(&range, range_v1, sizeof(*range_v1));
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memset(&range.base_proto, 0, sizeof(range.base_proto));
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return nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST);
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}
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static unsigned int
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xt_snat_target_v2(struct sk_buff *skb, const struct xt_action_param *par)
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{
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const struct nf_nat_range2 *range = par->targinfo;
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enum ip_conntrack_info ctinfo;
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struct nf_conn *ct;
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ct = nf_ct_get(skb, &ctinfo);
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WARN_ON(!(ct != NULL &&
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(ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED ||
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ctinfo == IP_CT_RELATED_REPLY)));
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return nf_nat_setup_info(ct, range, NF_NAT_MANIP_SRC);
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}
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static unsigned int
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xt_dnat_target_v2(struct sk_buff *skb, const struct xt_action_param *par)
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{
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const struct nf_nat_range2 *range = par->targinfo;
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enum ip_conntrack_info ctinfo;
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struct nf_conn *ct;
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ct = nf_ct_get(skb, &ctinfo);
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WARN_ON(!(ct != NULL &&
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(ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED)));
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return nf_nat_setup_info(ct, range, NF_NAT_MANIP_DST);
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}
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static struct xt_target xt_nat_target_reg[] __read_mostly = {
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{
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.name = "SNAT",
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.revision = 0,
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.checkentry = xt_nat_checkentry_v0,
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.destroy = xt_nat_destroy,
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.target = xt_snat_target_v0,
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.targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat),
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.family = NFPROTO_IPV4,
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.table = "nat",
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.hooks = (1 << NF_INET_POST_ROUTING) |
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(1 << NF_INET_LOCAL_IN),
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.me = THIS_MODULE,
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},
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{
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.name = "DNAT",
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.revision = 0,
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.checkentry = xt_nat_checkentry_v0,
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.destroy = xt_nat_destroy,
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.target = xt_dnat_target_v0,
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.targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat),
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.family = NFPROTO_IPV4,
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.table = "nat",
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.hooks = (1 << NF_INET_PRE_ROUTING) |
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(1 << NF_INET_LOCAL_OUT),
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.me = THIS_MODULE,
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},
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{
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.name = "SNAT",
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.revision = 1,
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.checkentry = xt_nat_checkentry,
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.destroy = xt_nat_destroy,
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.target = xt_snat_target_v1,
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.targetsize = sizeof(struct nf_nat_range),
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.table = "nat",
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.hooks = (1 << NF_INET_POST_ROUTING) |
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(1 << NF_INET_LOCAL_IN),
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.me = THIS_MODULE,
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},
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{
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.name = "DNAT",
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.revision = 1,
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.checkentry = xt_nat_checkentry,
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.destroy = xt_nat_destroy,
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.target = xt_dnat_target_v1,
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.targetsize = sizeof(struct nf_nat_range),
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.table = "nat",
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.hooks = (1 << NF_INET_PRE_ROUTING) |
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(1 << NF_INET_LOCAL_OUT),
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.me = THIS_MODULE,
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},
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{
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.name = "SNAT",
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.revision = 2,
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.checkentry = xt_nat_checkentry,
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.destroy = xt_nat_destroy,
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.target = xt_snat_target_v2,
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.targetsize = sizeof(struct nf_nat_range2),
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.table = "nat",
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.hooks = (1 << NF_INET_POST_ROUTING) |
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(1 << NF_INET_LOCAL_IN),
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.me = THIS_MODULE,
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},
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{
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.name = "DNAT",
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.revision = 2,
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.checkentry = xt_nat_checkentry,
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.destroy = xt_nat_destroy,
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.target = xt_dnat_target_v2,
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.targetsize = sizeof(struct nf_nat_range2),
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.table = "nat",
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.hooks = (1 << NF_INET_PRE_ROUTING) |
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(1 << NF_INET_LOCAL_OUT),
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.me = THIS_MODULE,
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},
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};
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static int __init xt_nat_init(void)
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{
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return xt_register_targets(xt_nat_target_reg,
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ARRAY_SIZE(xt_nat_target_reg));
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}
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static void __exit xt_nat_exit(void)
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{
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xt_unregister_targets(xt_nat_target_reg, ARRAY_SIZE(xt_nat_target_reg));
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}
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module_init(xt_nat_init);
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module_exit(xt_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("ipt_SNAT");
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MODULE_ALIAS("ipt_DNAT");
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MODULE_ALIAS("ip6t_SNAT");
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MODULE_ALIAS("ip6t_DNAT");
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MODULE_DESCRIPTION("SNAT and DNAT targets support");
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