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new network feature: NAPT (widely known as NAT) (#6360)

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* lwIP: napt patches (enabled with lwip2 w/o IPv6 w/ features)
This commit is contained in:
david gauchard
2019-08-28 17:51:14 +02:00
committed by GitHub
parent 7436f3802a
commit 06f1865628
18 changed files with 497 additions and 8 deletions
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116
tools/sdk/lwip2/include/lwip/napt.h Normal file
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#ifndef __LWIP_NAPT_H__
#define __LWIP_NAPT_H__
#include "lwip/opt.h"
#include "lwip/err.h"
#ifdef __cplusplus
extern "C" {
#endif
#if IP_FORWARD
#if IP_NAPT
/* Default size of the tables used for NAPT */
#define IP_NAPT_MAX 512
#define IP_PORTMAP_MAX 32
/* Timeouts in sec for the various protocol types */
#define IP_NAPT_TIMEOUT_MS_TCP (30*60*1000)
#define IP_NAPT_TIMEOUT_MS_TCP_DISCON (20*1000)
#define IP_NAPT_TIMEOUT_MS_UDP (2*1000)
#define IP_NAPT_TIMEOUT_MS_ICMP (2*1000)
#define IP_NAPT_PORT_RANGE_START 49152
#define IP_NAPT_PORT_RANGE_END 61439
struct napt_table {
u32_t last;
u32_t src;
u32_t dest;
u16_t sport;
u16_t dport;
u16_t mport;
u8_t proto;
u8_t fin1 : 1;
u8_t fin2 : 1;
u8_t finack1 : 1;
u8_t finack2 : 1;
u8_t synack : 1;
u8_t rst : 1;
u16_t next, prev;
};
struct portmap_table {
u32_t maddr;
u32_t daddr;
u16_t mport;
u16_t dport;
u8_t proto;
u8_t valid;
};
extern struct portmap_table *ip_portmap_table;
/**
* Allocates and initializes the NAPT tables.
*
* @param max_nat max number of enties in the NAPT table (use IP_NAPT_MAX if in doubt)
* @param max_portmap max number of enties in the NAPT table (use IP_PORTMAP_MAX if in doubt)
*/
err_t
ip_napt_init(u16_t max_nat, u8_t max_portmap);
/**
* Enable/Disable NAPT for a specified interface.
*
* @param addr ip address of the interface
* @param enable non-zero to enable NAPT, or 0 to disable.
*/
err_t
ip_napt_enable(u32_t addr, int enable);
/**
* Enable/Disable NAPT for a specified interface.
*
* @param netif number of the interface
* @param enable non-zero to enable NAPT, or 0 to disable.
*/
err_t
ip_napt_enable_no(u8_t number, int enable);
/**
* Register port mapping on the external interface to internal interface.
* When the same port mapping is registered again, the old mapping is overwritten.
* In this implementation, only 1 unique port mapping can be defined for each target address/port.
*
* @param proto target protocol
* @param maddr ip address of the external interface
* @param mport mapped port on the external interface, in host byte order.
* @param daddr destination ip address
* @param dport destination port, in host byte order.
*/
u8_t
ip_portmap_add(u8_t proto, u32_t maddr, u16_t mport, u32_t daddr, u16_t dport);
/**
* Unregister port mapping on the external interface to internal interface.
*
* @param proto target protocol
* @param maddr ip address of the external interface
*/
u8_t
ip_portmap_remove(u8_t proto, u16_t mport);
#endif /* IP_NAPT */
#endif /* IP_FORWARD */
#ifdef __cplusplus
}
#endif
#endif /* __LWIP_NAPT_H__ */