cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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nf_nat.h (3695B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _NF_NAT_H
      3#define _NF_NAT_H
      4
      5#include <linux/list.h>
      6#include <linux/netfilter_ipv4.h>
      7#include <linux/netfilter/nf_conntrack_pptp.h>
      8#include <net/netfilter/nf_conntrack.h>
      9#include <net/netfilter/nf_conntrack_extend.h>
     10#include <net/netfilter/nf_conntrack_tuple.h>
     11#include <uapi/linux/netfilter/nf_nat.h>
     12
     13enum nf_nat_manip_type {
     14	NF_NAT_MANIP_SRC,
     15	NF_NAT_MANIP_DST
     16};
     17
     18/* SRC manip occurs POST_ROUTING or LOCAL_IN */
     19#define HOOK2MANIP(hooknum) ((hooknum) != NF_INET_POST_ROUTING && \
     20			     (hooknum) != NF_INET_LOCAL_IN)
     21
     22/* per conntrack: nat application helper private data */
     23union nf_conntrack_nat_help {
     24	/* insert nat helper private data here */
     25#if IS_ENABLED(CONFIG_NF_NAT_PPTP)
     26	struct nf_nat_pptp nat_pptp_info;
     27#endif
     28};
     29
     30/* The structure embedded in the conntrack structure. */
     31struct nf_conn_nat {
     32	union nf_conntrack_nat_help help;
     33#if IS_ENABLED(CONFIG_NF_NAT_MASQUERADE)
     34	int masq_index;
     35#endif
     36};
     37
     38/* Set up the info structure to map into this range. */
     39unsigned int nf_nat_setup_info(struct nf_conn *ct,
     40			       const struct nf_nat_range2 *range,
     41			       enum nf_nat_manip_type maniptype);
     42
     43extern unsigned int nf_nat_alloc_null_binding(struct nf_conn *ct,
     44					      unsigned int hooknum);
     45
     46struct nf_conn_nat *nf_ct_nat_ext_add(struct nf_conn *ct);
     47
     48static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct)
     49{
     50#if IS_ENABLED(CONFIG_NF_NAT)
     51	return nf_ct_ext_find(ct, NF_CT_EXT_NAT);
     52#else
     53	return NULL;
     54#endif
     55}
     56
     57static inline bool nf_nat_oif_changed(unsigned int hooknum,
     58				      enum ip_conntrack_info ctinfo,
     59				      struct nf_conn_nat *nat,
     60				      const struct net_device *out)
     61{
     62#if IS_ENABLED(CONFIG_NF_NAT_MASQUERADE)
     63	return nat && nat->masq_index && hooknum == NF_INET_POST_ROUTING &&
     64	       CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL &&
     65	       nat->masq_index != out->ifindex;
     66#else
     67	return false;
     68#endif
     69}
     70
     71int nf_nat_register_fn(struct net *net, u8 pf, const struct nf_hook_ops *ops,
     72		       const struct nf_hook_ops *nat_ops, unsigned int ops_count);
     73void nf_nat_unregister_fn(struct net *net, u8 pf, const struct nf_hook_ops *ops,
     74			  unsigned int ops_count);
     75
     76unsigned int nf_nat_packet(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
     77			   unsigned int hooknum, struct sk_buff *skb);
     78
     79unsigned int nf_nat_manip_pkt(struct sk_buff *skb, struct nf_conn *ct,
     80			      enum nf_nat_manip_type mtype,
     81			      enum ip_conntrack_dir dir);
     82void nf_nat_csum_recalc(struct sk_buff *skb,
     83			u8 nfproto, u8 proto, void *data, __sum16 *check,
     84			int datalen, int oldlen);
     85
     86int nf_nat_icmp_reply_translation(struct sk_buff *skb, struct nf_conn *ct,
     87				  enum ip_conntrack_info ctinfo,
     88				  unsigned int hooknum);
     89
     90int nf_nat_icmpv6_reply_translation(struct sk_buff *skb, struct nf_conn *ct,
     91				    enum ip_conntrack_info ctinfo,
     92				    unsigned int hooknum, unsigned int hdrlen);
     93
     94int nf_nat_ipv4_register_fn(struct net *net, const struct nf_hook_ops *ops);
     95void nf_nat_ipv4_unregister_fn(struct net *net, const struct nf_hook_ops *ops);
     96
     97int nf_nat_ipv6_register_fn(struct net *net, const struct nf_hook_ops *ops);
     98void nf_nat_ipv6_unregister_fn(struct net *net, const struct nf_hook_ops *ops);
     99
    100int nf_nat_inet_register_fn(struct net *net, const struct nf_hook_ops *ops);
    101void nf_nat_inet_unregister_fn(struct net *net, const struct nf_hook_ops *ops);
    102
    103unsigned int
    104nf_nat_inet_fn(void *priv, struct sk_buff *skb,
    105	       const struct nf_hook_state *state);
    106
    107static inline int nf_nat_initialized(struct nf_conn *ct,
    108				     enum nf_nat_manip_type manip)
    109{
    110	if (manip == NF_NAT_MANIP_SRC)
    111		return ct->status & IPS_SRC_NAT_DONE;
    112	else
    113		return ct->status & IPS_DST_NAT_DONE;
    114}
    115#endif