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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | #ifndef _NF_NAT_HELPER_H |
| 3 | #define _NF_NAT_HELPER_H |
| 4 | /* NAT protocol helper routines. */ |
| 5 | |
| 6 | #include <linux/skbuff.h> |
| 7 | #include <net/netfilter/nf_conntrack.h> |
| 8 | #include <net/netfilter/nf_conntrack_expect.h> |
| 9 | |
| 10 | /* These return true or false. */ |
| 11 | bool __nf_nat_mangle_tcp_packet(struct sk_buff *skb, struct nf_conn *ct, |
| 12 | enum ip_conntrack_info ctinfo, |
| 13 | unsigned int protoff, unsigned int match_offset, |
| 14 | unsigned int match_len, const char *rep_buffer, |
| 15 | unsigned int rep_len, bool adjust); |
| 16 | |
| 17 | static inline bool nf_nat_mangle_tcp_packet(struct sk_buff *skb, |
| 18 | struct nf_conn *ct, |
| 19 | enum ip_conntrack_info ctinfo, |
| 20 | unsigned int protoff, |
| 21 | unsigned int match_offset, |
| 22 | unsigned int match_len, |
| 23 | const char *rep_buffer, |
| 24 | unsigned int rep_len) |
| 25 | { |
| 26 | return __nf_nat_mangle_tcp_packet(skb, ct, ctinfo, protoff, |
| 27 | match_offset, match_len, |
| 28 | rep_buffer, rep_len, true); |
| 29 | } |
| 30 | |
| 31 | bool nf_nat_mangle_udp_packet(struct sk_buff *skb, struct nf_conn *ct, |
| 32 | enum ip_conntrack_info ctinfo, |
| 33 | unsigned int protoff, unsigned int match_offset, |
| 34 | unsigned int match_len, const char *rep_buffer, |
| 35 | unsigned int rep_len); |
| 36 | |
| 37 | /* Setup NAT on this expected conntrack so it follows master, but goes |
| 38 | * to port ct->master->saved_proto. */ |
| 39 | void nf_nat_follow_master(struct nf_conn *ct, struct nf_conntrack_expect *this); |
| 40 | |
| 41 | u16 nf_nat_exp_find_port(struct nf_conntrack_expect *exp, u16 port); |
| 42 | #endif |
| 43 |
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