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