[U-Boot] [PATCH v2 04/21] net: Move CDP out of net.c
Joe Hershberger
joe.hershberger at ni.com
Wed Mar 28 01:42:35 CEST 2012
Signed-off-by: Joe Hershberger <joe.hershberger at ni.com>
Cc: Joe Hershberger <joe.hershberger at gmail.com>
Cc: Simon Glass <sjg at chromium.org>
Cc: Mike Frysinger <vapier at gentoo.org>
---
Changes for v2:
- Moved is_cdp_packet to a separate patch
- Fixed blank newline at the end of cdp.h
- Pushed #ifdef CONFIG_CMD_CDP into header
include/net.h | 8 +-
net/Makefile | 1 +
net/cdp.c | 374 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
net/cdp.h | 20 +++
net/net.c | 366 +-------------------------------------------------------
5 files changed, 399 insertions(+), 370 deletions(-)
create mode 100644 net/cdp.c
create mode 100644 net/cdp.h
diff --git a/include/net.h b/include/net.h
index e39d88b..54f05bb 100644
--- a/include/net.h
+++ b/include/net.h
@@ -355,9 +355,7 @@ extern uchar NetEtherNullAddr[6];
extern ushort NetOurVLAN; /* Our VLAN */
extern ushort NetOurNativeVLAN; /* Our Native VLAN */
-extern uchar NetCDPAddr[6]; /* Ethernet CDP address */
-extern ushort CDPNativeVLAN; /* CDP returned native VLAN */
-extern ushort CDPApplianceVLAN; /* CDP returned appliance VLAN */
+extern const uchar NetCDPAddr[6]; /* Ethernet CDP address */
extern int NetState; /* Network loop state */
#define NETLOOP_CONTINUE 1
@@ -386,8 +384,8 @@ extern IPaddr_t NetPingIP; /* the ip address to ping */
#if defined(CONFIG_CMD_CDP)
/* when CDP completes these hold the return values */
-extern ushort CDPNativeVLAN;
-extern ushort CDPApplianceVLAN;
+extern ushort CDPNativeVLAN; /* CDP returned native VLAN */
+extern ushort CDPApplianceVLAN; /* CDP returned appliance VLAN */
#endif
#if defined(CONFIG_CMD_SNTP)
diff --git a/net/Makefile b/net/Makefile
index 5901046..b350bfc 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -28,6 +28,7 @@ include $(TOPDIR)/config.mk
LIB = $(obj)libnet.o
COBJS-$(CONFIG_CMD_NET) += bootp.o
+COBJS-$(CONFIG_CMD_CDP) += cdp.o
COBJS-$(CONFIG_CMD_DNS) += dns.o
COBJS-$(CONFIG_CMD_NET) += eth.o
COBJS-$(CONFIG_CMD_NET) += net.o
diff --git a/net/cdp.c b/net/cdp.c
new file mode 100644
index 0000000..028be82
--- /dev/null
+++ b/net/cdp.c
@@ -0,0 +1,374 @@
+/*
+ * 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 at denx.de
+ */
+
+#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;
+ Ethernet_t *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 = (Ethernet_t *)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);
+
+ (void) eth_send(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
+ NetState = NETLOOP_SUCCESS;
+}
+
+static void
+CDPDummyHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
+ unsigned len)
+{
+ /* nothing */
+}
+
+void
+CDPHandler(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);
+ NetSetHandler(CDPDummyHandler);
+
+ CDPSendTrigger();
+}
diff --git a/net/cdp.h b/net/cdp.h
new file mode 100644
index 0000000..93bc461
--- /dev/null
+++ b/net/cdp.h
@@ -0,0 +1,20 @@
+/*
+ * 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 at denx.de
+ */
+
+#if defined(CONFIG_CMD_CDP)
+
+#ifndef __CDP_H__
+#define __CDP_H__
+
+void CDPStart(void);
+void CDPHandler(const uchar *pkt, unsigned len);
+
+#endif /* __CDP_H__ */
+#endif
diff --git a/net/net.c b/net/net.c
index 1435245..b5b072a 100644
--- a/net/net.c
+++ b/net/net.c
@@ -92,9 +92,7 @@
#if defined(CONFIG_CMD_SNTP)
#include "sntp.h"
#endif
-#if defined(CONFIG_CDP_VERSION)
-#include <timestamp.h>
-#endif
+#include "cdp.h"
#if defined(CONFIG_CMD_DNS)
#include "dns.h"
#endif
@@ -164,10 +162,6 @@ uchar NetEtherNullAddr[6];
#ifdef CONFIG_API
void (*push_packet)(void *, int len) = 0;
#endif
-#if defined(CONFIG_CMD_CDP)
-/* Ethernet bcast address */
-uchar NetCDPAddr[6] = { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
-#endif
/* Network loop state */
int NetState;
/* Tried all network devices */
@@ -193,10 +187,6 @@ IPaddr_t NetPingIP;
static void PingStart(void);
#endif
-#if defined(CONFIG_CMD_CDP)
-static void CDPStart(void);
-#endif
-
#if defined(CONFIG_CMD_SNTP)
/* NTP server IP address */
IPaddr_t NetNtpServerIP;
@@ -843,360 +833,6 @@ static void PingStart(void)
}
#endif
-#if defined(CONFIG_CMD_CDP)
-
-#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;
-}
-
-int CDPSendTrigger(void)
-{
- uchar *pkt;
- ushort *s;
- ushort *cp;
- Ethernet_t *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 = (Ethernet_t *)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);
-
- (void) eth_send(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
- NetState = NETLOOP_SUCCESS;
-}
-
-static void
-CDPDummyHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
- unsigned len)
-{
- /* nothing */
-}
-
-static void
-CDPHandler(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;
-}
-
-static 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);
- NetSetHandler(CDPDummyHandler);
-
- CDPSendTrigger();
-}
-#endif
-
#ifdef CONFIG_IP_DEFRAG
/*
* This function collects fragments in a single packet, according
--
1.6.0.2
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