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net: Move ARP out of net.c

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Separate this functionality out of the net.c behemoth

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: Simon Glass <sjg@chromium.org>
Acked-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Joe Hershberger 2012-05-23 07:58:01 +00:00
parent 1735188329
commit d280d3f430
5 changed files with 259 additions and 197 deletions
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3
include/net.h
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@ -428,7 +428,8 @@ extern void NetSetIP(uchar *, IPaddr_t, int, int, int);
extern int NetCksumOk(uchar *, int); /* Return true if cksum OK */
extern uint NetCksum(uchar *, int); /* Calculate the checksum */
/* Set callbacks */
/* Callbacks */
extern rxhand_f *NetGetHandler(void); /* Get RX packet handler */
extern void NetSetHandler(rxhand_f *); /* Set RX packet handler */
extern void net_set_icmp_handler(rxhand_icmp_f *f); /* Set ICMP RX handler */
extern void NetSetTimeout(ulong, thand_f *);/* Set timeout handler */

1
net/Makefile
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@ -27,6 +27,7 @@ include $(TOPDIR)/config.mk
LIB = $(obj)libnet.o
COBJS-$(CONFIG_CMD_NET) += arp.o
COBJS-$(CONFIG_CMD_NET) += bootp.o
COBJS-$(CONFIG_CMD_CDP) += cdp.o
COBJS-$(CONFIG_CMD_DNS) += dns.o

213
net/arp.c Normal file
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@ -0,0 +1,213 @@
/*
* Copied from Linux Monitor (LiMon) - Networking.
*
* Copyright 1994 - 2000 Neil Russell.
* (See License)
* Copyright 2000 Roland Borde
* Copyright 2000 Paolo Scaffardi
* Copyright 2000-2002 Wolfgang Denk, wd@denx.de
*/
#include <common.h>
#include "arp.h"
#ifndef CONFIG_ARP_TIMEOUT
/* Milliseconds before trying ARP again */
# define ARP_TIMEOUT 5000UL
#else
# define ARP_TIMEOUT CONFIG_ARP_TIMEOUT
#endif
#ifndef CONFIG_NET_RETRY_COUNT
# define ARP_TIMEOUT_COUNT 5 /* # of timeouts before giving up */
#else
# define ARP_TIMEOUT_COUNT CONFIG_NET_RETRY_COUNT
#endif
IPaddr_t NetArpWaitPacketIP;
IPaddr_t NetArpWaitReplyIP;
/* MAC address of waiting packet's destination */
uchar *NetArpWaitPacketMAC;
/* THE transmit packet */
uchar *NetArpWaitTxPacket;
int NetArpWaitTxPacketSize;
uchar NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
ulong NetArpWaitTimerStart;
int NetArpWaitTry;
void ArpInit(void)
{
/* XXX problem with bss workaround */
NetArpWaitPacketMAC = NULL;
NetArpWaitPacketIP = 0;
NetArpWaitReplyIP = 0;
NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
NetArpWaitTxPacketSize = 0;
}
void ArpRequest(void)
{
uchar *pkt;
ARP_t *arp;
debug("ARP broadcast %d\n", NetArpWaitTry);
pkt = NetTxPacket;
pkt += NetSetEther(pkt, NetBcastAddr, PROT_ARP);
arp = (ARP_t *) pkt;
arp->ar_hrd = htons(ARP_ETHER);
arp->ar_pro = htons(PROT_IP);
arp->ar_hln = 6;
arp->ar_pln = 4;
arp->ar_op = htons(ARPOP_REQUEST);
/* source ET addr */
memcpy(&arp->ar_data[0], NetOurEther, 6);
/* source IP addr */
NetWriteIP((uchar *) &arp->ar_data[6], NetOurIP);
/* dest ET addr = 0 */
memset(&arp->ar_data[10], '\0', 6);
if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
(NetOurIP & NetOurSubnetMask)) {
if (NetOurGatewayIP == 0) {
puts("## Warning: gatewayip needed but not set\n");
NetArpWaitReplyIP = NetArpWaitPacketIP;
} else {
NetArpWaitReplyIP = NetOurGatewayIP;
}
} else {
NetArpWaitReplyIP = NetArpWaitPacketIP;
}
NetWriteIP((uchar *) &arp->ar_data[16], NetArpWaitReplyIP);
(void) eth_send(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
}
void ArpTimeoutCheck(void)
{
ulong t;
if (!NetArpWaitPacketIP)
return;
t = get_timer(0);
/* check for arp timeout */
if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
NetArpWaitTry++;
if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
puts("\nARP Retry count exceeded; starting again\n");
NetArpWaitTry = 0;
NetStartAgain();
} else {
NetArpWaitTimerStart = t;
ArpRequest();
}
}
}
void ArpReceive(Ethernet_t *et, IP_t *ip, int len)
{
ARP_t *arp;
IPaddr_t tmp;
uchar *pkt;
/*
* We have to deal with two types of ARP packets:
* - REQUEST packets will be answered by sending our
* IP address - if we know it.
* - REPLY packates are expected only after we asked
* for the TFTP server's or the gateway's ethernet
* address; so if we receive such a packet, we set
* the server ethernet address
*/
debug("Got ARP\n");
arp = (ARP_t *)ip;
if (len < ARP_HDR_SIZE) {
printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
return;
}
if (ntohs(arp->ar_hrd) != ARP_ETHER)
return;
if (ntohs(arp->ar_pro) != PROT_IP)
return;
if (arp->ar_hln != 6)
return;
if (arp->ar_pln != 4)
return;
if (NetOurIP == 0)
return;
if (NetReadIP(&arp->ar_data[16]) != NetOurIP)
return;
switch (ntohs(arp->ar_op)) {
case ARPOP_REQUEST:
/* reply with our IP address */
debug("Got ARP REQUEST, return our IP\n");
pkt = (uchar *)et;
pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
arp->ar_op = htons(ARPOP_REPLY);
memcpy(&arp->ar_data[10], &arp->ar_data[0], 6);
NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
memcpy(&arp->ar_data[0], NetOurEther, 6);
NetCopyIP(&arp->ar_data[6], &NetOurIP);
(void) eth_send((uchar *)et,
(pkt - (uchar *)et) + ARP_HDR_SIZE);
return;
case ARPOP_REPLY: /* arp reply */
/* are we waiting for a reply */
if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
break;
#ifdef CONFIG_KEEP_SERVERADDR
if (NetServerIP == NetArpWaitPacketIP) {
char buf[20];
sprintf(buf, "%pM", arp->ar_data);
setenv("serveraddr", buf);
}
#endif
tmp = NetReadIP(&arp->ar_data[6]);
/* matched waiting packet's address */
if (tmp == NetArpWaitReplyIP) {
debug("Got ARP REPLY, set eth addr (%pM)\n",
arp->ar_data);
/* save address for later use */
memcpy(NetArpWaitPacketMAC,
&arp->ar_data[0], 6);
#ifdef CONFIG_NETCONSOLE
NetGetHandler()(0, 0, 0, 0, 0);
#endif
/* modify header, and transmit it */
memcpy(((Ethernet_t *)NetArpWaitTxPacket)->
et_dest, NetArpWaitPacketMAC, 6);
(void) eth_send(NetArpWaitTxPacket,
NetArpWaitTxPacketSize);
/* no arp request pending now */
NetArpWaitPacketIP = 0;
NetArpWaitTxPacketSize = 0;
NetArpWaitPacketMAC = NULL;
}
return;
default:
debug("Unexpected ARP opcode 0x%x\n",
ntohs(arp->ar_op));
return;
}
}

30
net/arp.h Normal file
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@ -0,0 +1,30 @@
/*
* Copied from Linux Monitor (LiMon) - Networking.
*
* Copyright 1994 - 2000 Neil Russell.
* (See License)
* Copyright 2000 Roland Borde
* Copyright 2000 Paolo Scaffardi
* Copyright 2000-2002 Wolfgang Denk, wd@denx.de
*/
#ifndef __ARP_H__
#define __ARP_H__
#include <common.h>
extern IPaddr_t NetArpWaitPacketIP;
/* MAC address of waiting packet's destination */
extern uchar *NetArpWaitPacketMAC;
/* THE transmit packet */
extern uchar *NetArpWaitTxPacket;
extern int NetArpWaitTxPacketSize;
extern ulong NetArpWaitTimerStart;
extern int NetArpWaitTry;
void ArpInit(void);
void ArpRequest(void);
void ArpTimeoutCheck(void);
void ArpReceive(Ethernet_t *et, IP_t *ip, int len);
#endif /* __ARP_H__ */

209
net/net.c
View File

@ -79,6 +79,7 @@
#include <command.h>
#include <linux/compiler.h>
#include <net.h>
#include "arp.h"
#include "bootp.h"
#include "tftp.h"
#ifdef CONFIG_CMD_RARP
@ -99,20 +100,6 @@
DECLARE_GLOBAL_DATA_PTR;
#ifndef CONFIG_ARP_TIMEOUT
/* Milliseconds before trying ARP again */
# define ARP_TIMEOUT 5000UL
#else
# define ARP_TIMEOUT CONFIG_ARP_TIMEOUT
#endif
#ifndef CONFIG_NET_RETRY_COUNT
# define ARP_TIMEOUT_COUNT 5 /* # of timeouts before giving up */
#else
# define ARP_TIMEOUT_COUNT CONFIG_NET_RETRY_COUNT
#endif
/** BOOTP EXTENTIONS **/
/* Our subnet mask (0=unknown) */
@ -219,82 +206,6 @@ static int NetTryCount;
/**********************************************************************/
IPaddr_t NetArpWaitPacketIP;
IPaddr_t NetArpWaitReplyIP;
/* MAC address of waiting packet's destination */
uchar *NetArpWaitPacketMAC;
/* THE transmit packet */
uchar *NetArpWaitTxPacket;
int NetArpWaitTxPacketSize;
uchar NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
ulong NetArpWaitTimerStart;
int NetArpWaitTry;
void ArpRequest(void)
{
uchar *pkt;
ARP_t *arp;
debug("ARP broadcast %d\n", NetArpWaitTry);
pkt = NetTxPacket;
pkt += NetSetEther(pkt, NetBcastAddr, PROT_ARP);
arp = (ARP_t *) pkt;
arp->ar_hrd = htons(ARP_ETHER);
arp->ar_pro = htons(PROT_IP);
arp->ar_hln = 6;
arp->ar_pln = 4;
arp->ar_op = htons(ARPOP_REQUEST);
/* source ET addr */
memcpy(&arp->ar_data[0], NetOurEther, 6);
/* source IP addr */
NetWriteIP((uchar *) &arp->ar_data[6], NetOurIP);
/* dest ET addr = 0 */
memset(&arp->ar_data[10], '\0', 6);
if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
(NetOurIP & NetOurSubnetMask)) {
if (NetOurGatewayIP == 0) {
puts("## Warning: gatewayip needed but not set\n");
NetArpWaitReplyIP = NetArpWaitPacketIP;
} else {
NetArpWaitReplyIP = NetOurGatewayIP;
}
} else {
NetArpWaitReplyIP = NetArpWaitPacketIP;
}
NetWriteIP((uchar *) &arp->ar_data[16], NetArpWaitReplyIP);
(void) eth_send(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
}
void ArpTimeoutCheck(void)
{
ulong t;
if (!NetArpWaitPacketIP)
return;
t = get_timer(0);
/* check for arp timeout */
if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
NetArpWaitTry++;
if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
puts("\nARP Retry count exceeded; starting again\n");
NetArpWaitTry = 0;
NetStartAgain();
} else {
NetArpWaitTimerStart = t;
ArpRequest();
}
}
}
/*
* Check if autoload is enabled. If so, use either NFS or TFTP to download
* the boot file.
@ -360,15 +271,11 @@ int NetLoop(enum proto_t protocol)
NetRestarted = 0;
NetDevExists = 0;
/* XXX problem with bss workaround */
NetArpWaitPacketMAC = NULL;
NetArpWaitTxPacket = NULL;
NetArpWaitPacketIP = 0;
NetArpWaitReplyIP = 0;
NetArpWaitTxPacket = NULL;
NetTxPacket = NULL;
NetTryCount = 1;
ArpInit();
if (!NetTxPacket) {
int i;
/*
@ -380,12 +287,6 @@ int NetLoop(enum proto_t protocol)
NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
}
if (!NetArpWaitTxPacket) {
NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
NetArpWaitTxPacketSize = 0;
}
bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
eth_halt();
eth_set_current();
@ -659,6 +560,13 @@ void NetStartAgain(void)
* Miscelaneous bits.
*/
rxhand_f *
NetGetHandler(void)
{
return packetHandler;
}
void
NetSetHandler(rxhand_f *f)
{
@ -1070,11 +978,12 @@ NetReceive(uchar *inpkt, int len)
{
Ethernet_t *et;
IP_t *ip;
#ifdef CONFIG_CMD_RARP
ARP_t *arp;
#endif
IPaddr_t tmp;
IPaddr_t src_ip;
int x;
uchar *pkt;
#if defined(CONFIG_CMD_CDP)
int iscdp;
#endif
@ -1171,99 +1080,7 @@ NetReceive(uchar *inpkt, int len)
switch (x) {
case PROT_ARP:
/*
* We have to deal with two types of ARP packets:
* - REQUEST packets will be answered by sending our
* IP address - if we know it.
* - REPLY packates are expected only after we asked
* for the TFTP server's or the gateway's ethernet
* address; so if we receive such a packet, we set
* the server ethernet address
*/
debug("Got ARP\n");
arp = (ARP_t *)ip;
if (len < ARP_HDR_SIZE) {
printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
return;
}
if (ntohs(arp->ar_hrd) != ARP_ETHER)
return;
if (ntohs(arp->ar_pro) != PROT_IP)
return;
if (arp->ar_hln != 6)
return;
if (arp->ar_pln != 4)
return;
if (NetOurIP == 0)
return;
if (NetReadIP(&arp->ar_data[16]) != NetOurIP)
return;
switch (ntohs(arp->ar_op)) {
case ARPOP_REQUEST:
/* reply with our IP address */
debug("Got ARP REQUEST, return our IP\n");
pkt = (uchar *)et;
pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
arp->ar_op = htons(ARPOP_REPLY);
memcpy(&arp->ar_data[10], &arp->ar_data[0], 6);
NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
memcpy(&arp->ar_data[0], NetOurEther, 6);
NetCopyIP(&arp->ar_data[6], &NetOurIP);
(void) eth_send((uchar *)et,
(pkt - (uchar *)et) + ARP_HDR_SIZE);
return;
case ARPOP_REPLY: /* arp reply */
/* are we waiting for a reply */
if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
break;
#ifdef CONFIG_KEEP_SERVERADDR
if (NetServerIP == NetArpWaitPacketIP) {
char buf[20];
sprintf(buf, "%pM", arp->ar_data);
setenv("serveraddr", buf);
}
#endif
debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n",
arp->ar_data);
tmp = NetReadIP(&arp->ar_data[6]);
/* matched waiting packet's address */
if (tmp == NetArpWaitReplyIP) {
debug("Got it\n");
/* save address for later use */
memcpy(NetArpWaitPacketMAC,
&arp->ar_data[0], 6);
#ifdef CONFIG_NETCONSOLE
(*packetHandler)(0, 0, 0, 0, 0);
#endif
/* modify header, and transmit it */
memcpy(((Ethernet_t *)NetArpWaitTxPacket)->
et_dest, NetArpWaitPacketMAC, 6);
(void) eth_send(NetArpWaitTxPacket,
NetArpWaitTxPacketSize);
/* no arp request pending now */
NetArpWaitPacketIP = 0;
NetArpWaitTxPacketSize = 0;
NetArpWaitPacketMAC = NULL;
}
return;
default:
debug("Unexpected ARP opcode 0x%x\n",
ntohs(arp->ar_op));
return;
}
ArpReceive(et, ip, len);
break;
#ifdef CONFIG_CMD_RARP