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u-boot/net/cdp.c
Wolfgang Denk 2ea9103924 SPDX License cleanup for LiMon imported files 
A number of network related files were imported from the LiMon
project; these contain a somewhat unclear license statement:

	Copyright 1994 - 2000 Neil Russell.
	(See License)

I analyzed the source code of LiMon v1.4.2 which was used for this
import.  It does not contain any "License" file, but the top level
directory contains a file "COPYING", which turns out to be GPL v2
of June 1991.  So it is legitimate to conclude that the LiMon derived
files are also to be released under GPLv2.  Mark them as such.

Signed-off-by: Wolfgang Denk <wd@denx.de>
2014-10-10 09:44:43 -04:00

367 lines
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/*
* 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
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <net.h>
#if defined(CONFIG_CDP_VERSION)
#include <timestamp.h>
#endif
#include "cdp.h"
/* Ethernet bcast address */
const uchar NetCDPAddr[6] = { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
#define CDP_DEVICE_ID_TLV 0x0001
#define CDP_ADDRESS_TLV 0x0002
#define CDP_PORT_ID_TLV 0x0003
#define CDP_CAPABILITIES_TLV 0x0004
#define CDP_VERSION_TLV 0x0005
#define CDP_PLATFORM_TLV 0x0006
#define CDP_NATIVE_VLAN_TLV 0x000a
#define CDP_APPLIANCE_VLAN_TLV 0x000e
#define CDP_TRIGGER_TLV 0x000f
#define CDP_POWER_CONSUMPTION_TLV 0x0010
#define CDP_SYSNAME_TLV 0x0014
#define CDP_SYSOBJECT_TLV 0x0015
#define CDP_MANAGEMENT_ADDRESS_TLV 0x0016
#define CDP_TIMEOUT 250UL /* one packet every 250ms */
static int CDPSeq;
static int CDPOK;
ushort CDPNativeVLAN;
ushort CDPApplianceVLAN;
static const uchar CDP_SNAP_hdr[8] = {
0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
static ushort
CDP_compute_csum(const uchar *buff, ushort len)
{
ushort csum;
int odd;
ulong result = 0;
ushort leftover;
ushort *p;
if (len > 0) {
odd = 1 & (ulong)buff;
if (odd) {
result = *buff << 8;
len--;
buff++;
}
while (len > 1) {
p = (ushort *)buff;
result += *p++;
buff = (uchar *)p;
if (result & 0x80000000)
result = (result & 0xFFFF) + (result >> 16);
len -= 2;
}
if (len) {
leftover = (signed short)(*(const signed char *)buff);
/*
* CISCO SUCKS big time! (and blows too):
* CDP uses the IP checksum algorithm with a twist;
* for the last byte it *sign* extends and sums.
*/
result = (result & 0xffff0000) |
((result + leftover) & 0x0000ffff);
}
while (result >> 16)
result = (result & 0xFFFF) + (result >> 16);
if (odd)
result = ((result >> 8) & 0xff) |
((result & 0xff) << 8);
}
/* add up 16-bit and 17-bit words for 17+c bits */
result = (result & 0xffff) + (result >> 16);
/* add up 16-bit and 2-bit for 16+c bit */
result = (result & 0xffff) + (result >> 16);
/* add up carry.. */
result = (result & 0xffff) + (result >> 16);
/* negate */
csum = ~(ushort)result;
/* run time endian detection */
if (csum != htons(csum)) /* little endian */
csum = htons(csum);
return csum;
}
static int
CDPSendTrigger(void)
{
uchar *pkt;
ushort *s;
ushort *cp;
struct ethernet_hdr *et;
int len;
ushort chksum;
#if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID) || \
defined(CONFIG_CDP_VERSION) || defined(CONFIG_CDP_PLATFORM)
char buf[32];
#endif
pkt = NetTxPacket;
et = (struct ethernet_hdr *)pkt;
/* NOTE: trigger sent not on any VLAN */
/* form ethernet header */
memcpy(et->et_dest, NetCDPAddr, 6);
memcpy(et->et_src, NetOurEther, 6);
pkt += ETHER_HDR_SIZE;
/* SNAP header */
memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
pkt += sizeof(CDP_SNAP_hdr);
/* CDP header */
*pkt++ = 0x02; /* CDP version 2 */
*pkt++ = 180; /* TTL */
s = (ushort *)pkt;
cp = s;
/* checksum (0 for later calculation) */
*s++ = htons(0);
/* CDP fields */
#ifdef CONFIG_CDP_DEVICE_ID
*s++ = htons(CDP_DEVICE_ID_TLV);
*s++ = htons(CONFIG_CDP_DEVICE_ID);
sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther);
memcpy((uchar *)s, buf, 16);
s += 16 / 2;
#endif
#ifdef CONFIG_CDP_PORT_ID
*s++ = htons(CDP_PORT_ID_TLV);
memset(buf, 0, sizeof(buf));
sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
len = strlen(buf);
if (len & 1) /* make it even */
len++;
*s++ = htons(len + 4);
memcpy((uchar *)s, buf, len);
s += len / 2;
#endif
#ifdef CONFIG_CDP_CAPABILITIES
*s++ = htons(CDP_CAPABILITIES_TLV);
*s++ = htons(8);
*(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
s += 2;
#endif
#ifdef CONFIG_CDP_VERSION
*s++ = htons(CDP_VERSION_TLV);
memset(buf, 0, sizeof(buf));
strcpy(buf, CONFIG_CDP_VERSION);
len = strlen(buf);
if (len & 1) /* make it even */
len++;
*s++ = htons(len + 4);
memcpy((uchar *)s, buf, len);
s += len / 2;
#endif
#ifdef CONFIG_CDP_PLATFORM
*s++ = htons(CDP_PLATFORM_TLV);
memset(buf, 0, sizeof(buf));
strcpy(buf, CONFIG_CDP_PLATFORM);
len = strlen(buf);
if (len & 1) /* make it even */
len++;
*s++ = htons(len + 4);
memcpy((uchar *)s, buf, len);
s += len / 2;
#endif
#ifdef CONFIG_CDP_TRIGGER
*s++ = htons(CDP_TRIGGER_TLV);
*s++ = htons(8);
*(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
s += 2;
#endif
#ifdef CONFIG_CDP_POWER_CONSUMPTION
*s++ = htons(CDP_POWER_CONSUMPTION_TLV);
*s++ = htons(6);
*s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
#endif
/* length of ethernet packet */
len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
et->et_protlen = htons(len);
len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
chksum = CDP_compute_csum((uchar *)NetTxPacket + len,
(uchar *)s - (NetTxPacket + len));
if (chksum == 0)
chksum = 0xFFFF;
*cp = htons(chksum);
NetSendPacket(NetTxPacket, (uchar *)s - NetTxPacket);
return 0;
}
static void
CDPTimeout(void)
{
CDPSeq++;
if (CDPSeq < 3) {
NetSetTimeout(CDP_TIMEOUT, CDPTimeout);
CDPSendTrigger();
return;
}
/* if not OK try again */
if (!CDPOK)
NetStartAgain();
else
net_set_state(NETLOOP_SUCCESS);
}
void cdp_receive(const uchar *pkt, unsigned len)
{
const uchar *t;
const ushort *ss;
ushort type, tlen;
ushort vlan, nvlan;
/* minimum size? */
if (len < sizeof(CDP_SNAP_hdr) + 4)
goto pkt_short;
/* check for valid CDP SNAP header */
if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
return;
pkt += sizeof(CDP_SNAP_hdr);
len -= sizeof(CDP_SNAP_hdr);
/* Version of CDP protocol must be >= 2 and TTL != 0 */
if (pkt[0] < 0x02 || pkt[1] == 0)
return;
/*
* if version is greater than 0x02 maybe we'll have a problem;
* output a warning
*/
if (pkt[0] != 0x02)
printf("**WARNING: CDP packet received with a protocol version "
"%d > 2\n", pkt[0] & 0xff);
if (CDP_compute_csum(pkt, len) != 0)
return;
pkt += 4;
len -= 4;
vlan = htons(-1);
nvlan = htons(-1);
while (len > 0) {
if (len < 4)
goto pkt_short;
ss = (const ushort *)pkt;
type = ntohs(ss[0]);
tlen = ntohs(ss[1]);
if (tlen > len)
goto pkt_short;
pkt += tlen;
len -= tlen;
ss += 2; /* point ss to the data of the TLV */
tlen -= 4;
switch (type) {
case CDP_DEVICE_ID_TLV:
break;
case CDP_ADDRESS_TLV:
break;
case CDP_PORT_ID_TLV:
break;
case CDP_CAPABILITIES_TLV:
break;
case CDP_VERSION_TLV:
break;
case CDP_PLATFORM_TLV:
break;
case CDP_NATIVE_VLAN_TLV:
nvlan = *ss;
break;
case CDP_APPLIANCE_VLAN_TLV:
t = (const uchar *)ss;
while (tlen > 0) {
if (tlen < 3)
goto pkt_short;
ss = (const ushort *)(t + 1);
#ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
if (t[0] == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
vlan = *ss;
#else
/* XXX will this work; dunno */
vlan = ntohs(*ss);
#endif
t += 3; tlen -= 3;
}
break;
case CDP_TRIGGER_TLV:
break;
case CDP_POWER_CONSUMPTION_TLV:
break;
case CDP_SYSNAME_TLV:
break;
case CDP_SYSOBJECT_TLV:
break;
case CDP_MANAGEMENT_ADDRESS_TLV:
break;
}
}
CDPApplianceVLAN = vlan;
CDPNativeVLAN = nvlan;
CDPOK = 1;
return;
pkt_short:
printf("** CDP packet is too short\n");
return;
}
void
CDPStart(void)
{
printf("Using %s device\n", eth_get_name());
CDPSeq = 0;
CDPOK = 0;
CDPNativeVLAN = htons(-1);
CDPApplianceVLAN = htons(-1);
NetSetTimeout(CDP_TIMEOUT, CDPTimeout);
CDPSendTrigger();
}
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