ARP

Address Resolution Protocol. More...

Functions
struct arpEntry *	arpAlloc (void)
thread	arpDaemon (void)
syscall	arpFree (struct arpEntry *entry)
struct arpEntry *	arpGetEntry (const struct netaddr *praddr)
syscall	arpInit (void)
syscall	arpLookup (struct netif *netptr, const struct netaddr *praddr, struct netaddr *hwaddr)
syscall	arpNotify (struct arpEntry *entry, message msg)
syscall	arpRecv (struct packet *pkt)
syscall	arpSendReply (struct packet *pkt)
syscall	arpSendRqst (struct arpEntry *entry)

Detailed Description

Address Resolution Protocol.

Function Documentation

struct arpEntry* arpAlloc

(

void

)

Allocates an entry from the ARP table.

Returns

entry in ARP table, SYSERR if error occurs

Precondition

-condition interrupts are disabled

Postcondition

-condition interrupts are still disabled

thread arpDaemon

(

void

)

ARP daemon to manage the ARP table.

syscall arpFree

(

struct arpEntry *

entry

)

Frees an entry from the ARP table.

Returns

SYSERR if error occurs, otherwise OK

struct arpEntry* arpGetEntry

(

const struct netaddr *

praddr

)

Obtains an entry from the ARP table given a protocol address.

Parameters

praddr

protocol address

Returns

entry for correspoding praddr in ARP table, NULL if none exists

< pointer to ARP table entry

< interrupt state

syscall arpInit

(

void

)

Initializes ARP table and ARP daemon.

Returns

OK if initialization is successful, otherwise SYSERR

syscall arpLookup	(	struct netif *	netptr,
		const struct netaddr *	praddr,
		struct netaddr *	hwaddr
	)

Obtains a hardware address from the ARP table given a protocol address.

Parameters

netptr	network interface
praddr	protocol address
hwaddr	buffer into which hardware address should be placed

Returns

OK if hardware address was obtained, otherwise TIMEOUT or SYSERR

< pointer to ARP table entry

< num of ARP lookups performed

< TTL for ARP table entry

< interrupt state

syscall arpNotify	(	struct arpEntry *	entry,
		message	msg
	)

Send a message to threads waiting on resolution of an ARP table entry.

Parameters

entry	ARP table entry
msg	message to send to waiting threads

Returns

OK if successful, SYSERR if error occurs

< index into ARP table

< interrupt state

syscall arpRecv

(

struct packet *

pkt

)

Processes an incoming ARP packet.

Parameters

pkt	pointer to the incoming packet return OK if packet was processed succesfully, otherwise SYSERR

< pointer to ARP table entry

< source hardware address

< source protocol address

< destination protocol address

< interrupt state

syscall arpSendReply

(

struct packet *

pkt

)

Sends an ARP reply for an ARP request over a network interface.

Parameters

pkt	ARP packet to reply to

Returns

OK if packet was sent, otherwise SYSERR

syscall arpSendRqst

(

struct arpEntry *

entry

)

Sends an ARP request for an ARP table entry over a network interface.

Parameters

entry

ARP table entry

Returns

OK if packet was sent, otherwise SYSERR