/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _NF_NAT_H
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#define _NF_NAT_H
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#include <linux/list.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/netfilter/nf_conntrack_pptp.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_extend.h>
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#include <net/netfilter/nf_conntrack_tuple.h>
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#include <uapi/linux/netfilter/nf_nat.h>
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enum nf_nat_manip_type {
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NF_NAT_MANIP_SRC,
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NF_NAT_MANIP_DST
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};
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/* SRC manip occurs POST_ROUTING or LOCAL_IN */
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#define HOOK2MANIP(hooknum) ((hooknum) != NF_INET_POST_ROUTING && \
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(hooknum) != NF_INET_LOCAL_IN)
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/* per conntrack: nat application helper private data */
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union nf_conntrack_nat_help {
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/* insert nat helper private data here */
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#if IS_ENABLED(CONFIG_NF_NAT_PPTP)
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struct nf_nat_pptp nat_pptp_info;
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#endif
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};
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/* The structure embedded in the conntrack structure. */
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struct nf_conn_nat {
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union nf_conntrack_nat_help help;
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#if IS_ENABLED(CONFIG_NF_NAT_MASQUERADE)
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int masq_index;
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#endif
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};
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/* Set up the info structure to map into this range. */
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unsigned int nf_nat_setup_info(struct nf_conn *ct,
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const struct nf_nat_range2 *range,
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enum nf_nat_manip_type maniptype);
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extern unsigned int nf_nat_alloc_null_binding(struct nf_conn *ct,
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unsigned int hooknum);
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struct nf_conn_nat *nf_ct_nat_ext_add(struct nf_conn *ct);
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static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct)
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{
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#if IS_ENABLED(CONFIG_NF_NAT)
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return nf_ct_ext_find(ct, NF_CT_EXT_NAT);
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#else
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return NULL;
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#endif
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}
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static inline bool nf_nat_oif_changed(unsigned int hooknum,
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enum ip_conntrack_info ctinfo,
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struct nf_conn_nat *nat,
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const struct net_device *out)
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{
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#if IS_ENABLED(CONFIG_NF_NAT_MASQUERADE)
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return nat && nat->masq_index && hooknum == NF_INET_POST_ROUTING &&
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CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL &&
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nat->masq_index != out->ifindex;
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#else
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return false;
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#endif
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}
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int nf_nat_register_fn(struct net *net, u8 pf, const struct nf_hook_ops *ops,
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const struct nf_hook_ops *nat_ops, unsigned int ops_count);
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void nf_nat_unregister_fn(struct net *net, u8 pf, const struct nf_hook_ops *ops,
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unsigned int ops_count);
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unsigned int nf_nat_packet(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
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unsigned int hooknum, struct sk_buff *skb);
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unsigned int nf_nat_manip_pkt(struct sk_buff *skb, struct nf_conn *ct,
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enum nf_nat_manip_type mtype,
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enum ip_conntrack_dir dir);
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void nf_nat_csum_recalc(struct sk_buff *skb,
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u8 nfproto, u8 proto, void *data, __sum16 *check,
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int datalen, int oldlen);
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int nf_nat_icmp_reply_translation(struct sk_buff *skb, struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned int hooknum);
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int nf_nat_icmpv6_reply_translation(struct sk_buff *skb, struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned int hooknum, unsigned int hdrlen);
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int nf_nat_ipv4_register_fn(struct net *net, const struct nf_hook_ops *ops);
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void nf_nat_ipv4_unregister_fn(struct net *net, const struct nf_hook_ops *ops);
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int nf_nat_ipv6_register_fn(struct net *net, const struct nf_hook_ops *ops);
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void nf_nat_ipv6_unregister_fn(struct net *net, const struct nf_hook_ops *ops);
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int nf_nat_inet_register_fn(struct net *net, const struct nf_hook_ops *ops);
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void nf_nat_inet_unregister_fn(struct net *net, const struct nf_hook_ops *ops);
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unsigned int
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nf_nat_inet_fn(void *priv, struct sk_buff *skb,
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const struct nf_hook_state *state);
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int nf_xfrm_me_harder(struct net *n, struct sk_buff *s, unsigned int family);
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static inline int nf_nat_initialized(struct nf_conn *ct,
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enum nf_nat_manip_type manip)
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{
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if (manip == NF_NAT_MANIP_SRC)
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return ct->status & IPS_SRC_NAT_DONE;
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else
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return ct->status & IPS_DST_NAT_DONE;
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}
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#endif
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