116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
#ifndef __LWIP_NAPT_H__
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#define __LWIP_NAPT_H__
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#include "lwip/opt.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if IP_FORWARD
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#if IP_NAPT
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/* Default size of the tables used for NAPT */
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#define IP_NAPT_MAX 512
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#define IP_PORTMAP_MAX 32
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/* Timeouts in sec for the various protocol types */
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#define IP_NAPT_TIMEOUT_MS_TCP (30*60*1000)
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#define IP_NAPT_TIMEOUT_MS_TCP_DISCON (20*1000)
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#define IP_NAPT_TIMEOUT_MS_UDP (2*1000)
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#define IP_NAPT_TIMEOUT_MS_ICMP (2*1000)
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#define IP_NAPT_PORT_RANGE_START 49152
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#define IP_NAPT_PORT_RANGE_END 61439
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struct napt_table {
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u32_t last;
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u32_t src;
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u32_t dest;
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u16_t sport;
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u16_t dport;
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u16_t mport;
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u8_t proto;
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u8_t fin1 : 1;
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u8_t fin2 : 1;
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u8_t finack1 : 1;
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u8_t finack2 : 1;
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u8_t synack : 1;
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u8_t rst : 1;
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u16_t next, prev;
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};
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struct portmap_table {
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u32_t maddr;
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u32_t daddr;
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u16_t mport;
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u16_t dport;
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u8_t proto;
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u8 valid;
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};
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extern struct portmap_table *ip_portmap_table;
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/**
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* Allocates and initializes the NAPT tables.
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*
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* @param max_nat max number of enties in the NAPT table (use IP_NAPT_MAX if in doubt)
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* @param max_portmap max number of enties in the NAPT table (use IP_PORTMAP_MAX if in doubt)
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*/
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void ICACHE_FLASH_ATTR
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ip_napt_init(uint16_t max_nat, uint8_t max_portmap);
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/**
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* Enable/Disable NAPT for a specified interface.
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*
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* @param addr ip address of the interface
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* @param enable non-zero to enable NAPT, or 0 to disable.
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*/
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void ICACHE_FLASH_ATTR
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ip_napt_enable(u32_t addr, int enable);
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/**
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* Enable/Disable NAPT for a specified interface.
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*
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* @param netif number of the interface
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* @param enable non-zero to enable NAPT, or 0 to disable.
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*/
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void ICACHE_FLASH_ATTR
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ip_napt_enable_no(u8_t number, int enable);
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/**
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* Register port mapping on the external interface to internal interface.
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* When the same port mapping is registered again, the old mapping is overwritten.
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* In this implementation, only 1 unique port mapping can be defined for each target address/port.
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*
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* @param proto target protocol
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* @param maddr ip address of the external interface
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* @param mport mapped port on the external interface, in host byte order.
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* @param daddr destination ip address
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* @param dport destination port, in host byte order.
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*/
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u8_t ICACHE_FLASH_ATTR
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ip_portmap_add(u8_t proto, u32_t maddr, u16_t mport, u32_t daddr, u16_t dport);
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/**
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* Unregister port mapping on the external interface to internal interface.
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*
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* @param proto target protocol
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* @param maddr ip address of the external interface
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*/
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u8_t ICACHE_FLASH_ATTR
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ip_portmap_remove(u8_t proto, u16_t mport);
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#endif /* IP_NAPT */
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#endif /* IP_FORWARD */
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#ifdef __cplusplus
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}
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#endif
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#endif /* __LWIP_NAPT_H__ */
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