uIP packet forwarding

Data Structures
struct	uip_fw_netif
	Representation of a uIP network interface. More...
Files
file	uip-fw.c
	uIP packet forwarding.
file	uip-fw.h
	uIP packet forwarding header file.
Defines
#define	UIP_FW_NETIF(ip1, ip2, ip3, ip4, nm1, nm2, nm3, nm4, outputfunc)
	Instantiating macro for a uIP network interface.
#define	uip_fw_setipaddr(netif, addr)
	Set the IP address of a network interface.
#define	uip_fw_setnetmask(netif, addr)
	Set the netmask of a network interface.
#define	UIP_FW_LOCAL
	A non-error message that indicates that a packet should be processed locally.
#define	UIP_FW_OK
	A non-error message that indicates that something went OK.
#define	UIP_FW_FORWARDED
	A non-error message that indicates that a packet was forwarded.
#define	UIP_FW_ZEROLEN
	A non-error message that indicates that a zero-length packet transmission was attempted, and that no packet was sent.
#define	UIP_FW_TOOLARGE
	An error message that indicates that a packet that was too large for the outbound network interface was detected.
#define	UIP_FW_NOROUTE
	An error message that indicates that no suitable interface could be found for an outbound packet.
#define	UIP_FW_DROPPED
	An error message that indicates that a packet that should be forwarded or output was dropped.
Functions
void	uip_fw_init (void)
	Initialize the uIP packet forwarding module.
uint8_t	uip_fw_output (void)
	Output an IP packet on the correct network interface.
uint8_t	uip_fw_forward (void)
	Forward an IP packet in the uip_buf buffer.
void	uip_fw_register (struct uip_fw_netif *netif)
	Register a network interface with the forwarding module.
void	uip_fw_default (struct uip_fw_netif *netif)
	Register a default network interface.
void	uip_fw_periodic (void)
	Perform periodic processing.

---

Define Documentation

#define UIP_FW_NETIF	(		ip1,
			ip2,
			ip3,
			ip4,
			nm1,
			nm2,
			nm3,
			nm4,
			outputfunc
	)

Instantiating macro for a uIP network interface.

Example:

 struct uip_fw_netif slipnetif =
   {UIP_FW_NETIF(192,168,76,1, 255,255,255,0, slip_output)};

Parameters:

ip1,ip2,ip3,ip4	The IP address of the network interface.
nm1,nm2,nm3,nm4	The netmask of the network interface.
outputfunc	A pointer to the output function of the network interface.

Definition at line 80 of file uip-fw.h.

#define uip_fw_setipaddr	(		netif,
			addr
	)

Set the IP address of a network interface.

Parameters:

netif	A pointer to the uip_fw_netif structure for the network interface.
addr	A pointer to an IP address.

Definition at line 95 of file uip-fw.h.

#define uip_fw_setnetmask	(		netif,
			addr
	)

Set the netmask of a network interface.

Parameters:

netif	A pointer to the uip_fw_netif structure for the network interface.
addr	A pointer to an IP address representing the netmask.

Definition at line 107 of file uip-fw.h.

---

Function Documentation

void uip_fw_default

(

struct uip_fw_netif *

netif

)

Register a default network interface.

All packets that don't go out on any of the other interfaces will be routed to the default interface.

Parameters:

netif

A pointer to the network interface that is to be registered.

Definition at line 516 of file uip-fw.c.

Referenced by main().

uint8_t uip_fw_forward

(

void

)

Forward an IP packet in the uip_buf buffer.

Returns:

UIP_FW_FORWARDED if the packet was forwarded, UIP_FW_LOCAL if the packet should be processed locally.

Definition at line 404 of file uip-fw.c.

References uip_appdata, UIP_FW_FORWARDED, UIP_FW_LOCAL, uip_fw_output(), UIP_HTONS, uip_ipaddr_cmp, uip_len, UIP_LLH_LEN, and UIP_REASSEMBLY.

uint8_t uip_fw_output

(

void

)

Output an IP packet on the correct network interface.

The IP packet should be present in the uip_buf buffer and its length in the global uip_len variable.

Return values:

UIP_FW_ZEROLEN	Indicates that a zero-length packet transmission was attempted and that no packet was sent.
UIP_FW_NOROUTE	No suitable network interface could be found for the outbound packet, and the packet was not sent.

Returns:

The return value from the actual network interface output function is passed unmodified as a return value.

Definition at line 355 of file uip-fw.c.

References uip_fw_netif::next, NULL, uip_fw_netif::output, UIP_FW_NOROUTE, UIP_FW_OK, UIP_FW_ZEROLEN, uip_ipaddr_cmp, and uip_len.

Referenced by uip_fw_forward().

void uip_fw_register

(

struct uip_fw_netif *

netif

)

Register a network interface with the forwarding module.

Parameters:

netif

A pointer to the network interface that is to be registered.

Definition at line 499 of file uip-fw.c.

References uip_fw_netif::next.

Referenced by main().