Hello,
First, I had to say that this is my first post on this list, and I wish to
introduce myself.
I am an electronic engineer and I work on a project which use FreeRTOS and
Lwip v 1.3.0. This project use a specific design which is made on an atmel
AT91SAM7X512 and a IDT ICS 1893 for the PHY layer. The project is build on a
Linux station and I use GCC, openocd and Eclipse.
Today,* I am stuck on an UDP problem* and I want to ask you for advice.
The project has been built on a FreeRTOS demo v4.2.0 which have been upgrade
to v5.0.2. As the same, the lwip have been upgrade from the 1.1.0 to 1.3.0.
I have put on my project some kind of TCP servers which are well working.
But I want now to add a TFTP server and I must use UDP. I first try to use
socket as there is a TFTP demo on FreeRTOS which use it. As it was not
working, I then try to test more trivial example and I switch back to
netconn API. I then try to use the lwip contrib udpecho.c example. I copy
this example in my project but I can't received any udp echo.
I have enabled some lwip trace (API_LIB_DEBUG, UDP_DEBUG and IP_DEBUG) and I
think the lwip stack is trying to send back the echo, but there is something
that is not working. I first think for a timer problem, but I can't find
where It can be.
*The test is base on a udp packet send from a pc (133.38.20.50) to a target
(133.38.20.150) tfpt port (69) which contain the data "ping"*
*I give you my code :*
/*-----------------------------------------------------------------------------------*/
void udpecho_thread(void *arg);
void
udpecho_thread(void *arg)
{
static struct netconn *conn;
static struct netbuf *buf;
static struct ip_addr *addr;
static unsigned short port;
//char buffer[4096];
(void) arg;
// on attend que l'interface soit montée
//while (xEthInterfaceIsUp != pdTRUE)
while (! netif_is_up(&EMAC_if))
vTaskDelay(BLOCK_100ms);
trace_LOG(trace_DEBUG, "running...\n\r");
trace_LOG(trace_DEBUG, "netconn_new\n\r");
conn = netconn_new(NETCONN_UDP);
trace_LOG(trace_DEBUG, "bind\n\r");
netconn_bind(conn, NULL, tftp_PORT);
while (1) {
trace_LOG(trace_DEBUG, "recv\n\r");
buf = netconn_recv(conn);
trace_LOG(trace_DEBUG, "fromaddr\n\r");
addr = netbuf_fromaddr(buf);
trace_LOG(trace_DEBUG, "fromport\n\r");
port = netbuf_fromport(buf);
trace_LOG(trace_DEBUG, "connect\n\r");
netconn_connect(conn, addr, port);
trace_LOG(trace_DEBUG, "copy\n\r");
netbuf_copy(buf, buffer, buf->p->tot_len);
trace_LOG(trace_DEBUG, "delimiter\n\r");
buffer[buf->p->tot_len] = '\0';
trace_LOG(trace_DEBUG, "send\n\r");
netconn_send(conn, buf);
//printf("got %s\n", buffer);
trace_LOG(trace_DEBUG, "get %s\n\r", buffer);
trace_LOG(trace_DEBUG, "delete\n\r");
netbuf_delete(buf);
}
}
/*-----------------------------------------------------------------------------------*/
void
udpecho_init(void)
{
if (sys_thread_new("udpecho_d", udpecho_thread, (void *) NULL,
TCP_SERVER_STACK_SIZE + 100, TCP_SERVER_PRIORITY ) == NULL)
while (1);
}
*And the trace it produced :*
<LF><CR>-D- udpecho_thread - running...
<LF><CR>-D- udpecho_thread - netconn_new
<LF><CR>-D- udpecho_thread - bind
<LF><CR>udp_bind(ipaddr = 0.0.0.0, port = 69)
<LF>udp_bind: bound to 0.0.0.0, port 69
<LF>-D- udpecho_thread - recv
<LF><CR>ip_input: iphdr->dest 0x96142685 netif->ip_addr 0x96142685 (0x2685,
0x2685, 0x96140000)
<LF>ip_input: packet accepted on interface em
<LF>ip_input: IP header:+-------------------------------+| 4 | 5 | 0x00
| 33 | (v, hl, tos, len)
<LF>+-------------------------------+| 20372 |010| 0 | (id,
flags, offset)
<LF>+-------------------------------+| 64 | 17 | 0xb823 | (ttl,
proto, chksum)
<LF>+-------------------------------+| 133 | 38 | 20 | 50 | (src)
<LF>+-------------------------------+| 133 | 38 | 20 | 150 |
(dest)
<LF>+-------------------------------+ip_input: p->len 33 p->tot_len 33
<LF>udp_input: received datagram of length 13
<LF>UDP header:+-------------------------------+| 41486 |
69 | (src port, dest port)
<LF>+-------------------------------+| 13 | 0x419b | (len,
chksum)
<LF>+-------------------------------+udp (133.38.20.150, 69) <--
(133.38.20.50, 41486)
<LF>pcb (0.0.0.0, 69) --- (0.0.0.0, 0)
<LF>udp_input: calculating checksumnetconn_recv: received -D- udpecho_thread
- fromaddr
<LF><CR>-D- udpecho_thread - fromport
<LF><CR>-D- udpecho_thread - connect
<LF><CR>udp_connect: connected to 133.38.20.50,port 41486
<LF>-D- udpecho_thread - copy
<LF><CR>-D- udpecho_thread - delimiter
<LF><CR>-D- udpecho_thread - send
<LF><CR>netconn_send: sending 5 bytes
<LF>netconn_send: dst = 32142685
<LF><CR>netconn_send: port = a20e
<LF><CR>udp_sendudp_send: added header in given pbuf _STRING_SIZE
<LF><CR>udp_send: sending datagram of length 13
<LF>udp_send: UDP packet length 13
<LF>udp_send: UDP checksum 0x9b41
<LF>udp_send: ip_output_if (,,,,IP_PROTO_UDP,)ip_output_if: em0
<LF>IP header:+-------------------------------+| 4 | 5 | 0x00 |
33 | (v, hl, tos, len)
<LF>+-------------------------------+| 0 |000| 0 | (id,
flags, offset)
<LF>+-------------------------------+| 64 | 17 | 0x47b8 | (ttl,
proto, chksum)
<LF>+-------------------------------+| 133 | 38 | 20 | 150 | (src)
<LF>+-------------------------------+| 133 | 38 | 20 | 50 |
(dest)
<LF>+-------------------------------+netif->output()-D- udpecho_thread - get
ping
<LF>
<LF><CR>-D- udpecho_thread - delete
<LF><CR>-D- udpecho_thread - recv
<LF><CR>
*the lwip statistic output :*
<LF><CR>
<LF>LINK
<LF><HT>xmit: 1
<LF><HT>rexmit: 0
<LF><HT>recv: 68
<LF><HT>fw: 0
<LF><HT>drop: 0
<LF><HT>chkerr: 0
<LF><HT>lenerr: 0
<LF><HT>memerr: 0
<LF><HT>rterr: 0
<LF><HT>proterr: 0
<LF><HT>opterr: 0
<LF><HT>err: 0
<LF><HT>cachehit: 0
<LF>
<LF>ETHARP
<LF><HT>xmit: 1
<LF><HT>rexmit: 0
<LF><HT>recv: 33
<LF><HT>fw: 0
<LF><HT>drop: 0
<LF><HT>chkerr: 0
<LF><HT>lenerr: 0
<LF><HT>memerr: 0
<LF><HT>rterr: 0
<LF><HT>proterr: 0
<LF><HT>opterr: 0
<LF><HT>err: 0
<LF><HT>cachehit: 32
<LF>
<LF>IP_FRAG
<LF><HT>xmit: 0
<LF><HT>rexmit: 0
<LF><HT>recv: 0
<LF><HT>fw: 0
<LF><HT>drop: 0
<LF><HT>chkerr: 0
<LF><HT>lenerr: 0
<LF><HT>memerr: 0
<LF><HT>rterr: 0
<LF><HT>proterr: 0
<LF><HT>opterr: 0
<LF><HT>err: 0
<LF><HT>cachehit: 0
<LF>
<LF>IP
<LF><HT>xmit: 1
<LF><HT>rexmit: 0
<LF><HT>recv: 1
<LF><HT>fw: 0
<LF><HT>drop: 0
<LF><HT>chkerr: 0
<LF><HT>lenerr: 0
<LF><HT>memerr: 0
<LF><HT>rterr: 0
<LF><HT>proterr: 0
<LF><HT>opterr: 0
<LF><HT>err: 0
<LF><HT>cachehit: 0
<LF>
<LF>ICMP
<LF><HT>xmit: 0
<LF><HT>rexmit: 0
<LF><HT>recv: 0
<LF><HT>fw: 0
<LF><HT>drop: 0
<LF><HT>chkerr: 0
<LF><HT>lenerr: 0
<LF><HT>memerr: 0
<LF><HT>rterr: 0
<LF><HT>proterr: 0
<LF><HT>opterr: 0
<LF><HT>err: 0
<LF><HT>cachehit: 0
<LF>
<LF>UDP
<LF><HT>xmit: 1
<LF><HT>rexmit: 0
<LF><HT>recv: 1
<LF><HT>fw: 0
<LF><HT>drop: 0
<LF><HT>chkerr: 0
<LF><HT>lenerr: 0
<LF><HT>memerr: 0
<LF><HT>rterr: 0
<LF><HT>proterr: 0
<LF><HT>opterr: 0
<LF><HT>err: 0
<LF><HT>cachehit: 0
<LF>
<LF>TCP
<LF><HT>xmit: 0
<LF><HT>rexmit: 0
<LF><HT>recv: 0
<LF><HT>fw: 0
<LF><HT>drop: 0
<LF><HT>chkerr: 0
<LF><HT>lenerr: 0
<LF><HT>memerr: 0
<LF><HT>rterr: 0
<LF><HT>proterr: 0
<LF><HT>opterr: 0
<LF><HT>err: 0
<LF><HT>cachehit: 0
<LF>
<LF>MEM HEAP
<LF><HT>avail: 1600
<LF><HT>used: 20
<LF><HT>max: 104
<LF><HT>err: 0
<LF>
<LF>MEM RAW_PCB
<LF><HT>avail: 4
<LF><HT>used: 0
<LF><HT>max: 0
<LF><HT>err: 0
<LF>
<LF>MEM UDP_PCB
<LF><HT>avail: 4
<LF><HT>used: 1
<LF><HT>max: 1
<LF><HT>err: 0
<LF>
<LF>MEM TCP_PCB
<LF><HT>avail: 5
<LF><HT>used: 0
<LF><HT>max: 1
<LF><HT>err: 0
<LF>
<LF>MEM TCP_PCB_LISTEN
<LF><HT>avail: 8
<LF><HT>used: 1
<LF><HT>max: 1
<LF><HT>err: 0
<LF>
<LF>MEM TCP_SEG
<LF><HT>avail: 16
<LF><HT>used: 0
<LF><HT>max: 0
<LF><HT>err: 0
<LF>
<LF>MEM REASSDATA
<LF><HT>avail: 5
<LF><HT>used: 0
<LF><HT>max: 0
<LF><HT>err: 0
<LF>
<LF>MEM NETBUF
<LF><HT>avail: 4
<LF><HT>used: 0
<LF><HT>max: 1
<LF><HT>err: 0
<LF>
<LF>MEM NETCONN
<LF><HT>avail: 8
<LF><HT>used: 2
<LF><HT>max: 2
<LF><HT>err: 0
<LF>
<LF>MEM TCPIP_MSG_API
<LF><HT>avail: 8
<LF><HT>used: 0
<LF><HT>max: 0
<LF><HT>err: 0
<LF>
<LF>MEM TCPIP_MSG_INPKT
<LF><HT>avail: 8
<LF><HT>used: 0
<LF><HT>max: 1
<LF><HT>err: 0
<LF>
<LF>MEM ARP_QUEUE
<LF><HT>avail: 30
<LF><HT>used: 0
<LF><HT>max: 1
<LF><HT>err: 0
<LF>
<LF>MEM SYS_TIMEOUT
<LF><HT>avail: 5
<LF><HT>used: 3
<LF><HT>max: 3
<LF><HT>err: 0
<LF>
<LF>MEM PBUF_REF/ROM
<LF><HT>avail: 16
<LF><HT>used: 0
<LF><HT>max: 0
<LF><HT>err: 0
<LF>
<LF>MEM PBUF_POOL
<LF><HT>avail: 16
<LF><HT>used: 0
<LF><HT>max: 1
<LF><HT>err: 0
<LF>
*And last, the wireshark log :*
No. Time Source Destination Protocol
Info
* 1 10:07:34.033002 133.38.20.50 133.38.20.150
TFTP Unknown (0x7069)*
Frame 1 (47 bytes on wire, 47 bytes captured)
Arrival Time: Jun 26, 2009 10:07:34.033002000
[Time delta from previous captured frame: 0.000000000 seconds]
[Time delta from previous displayed frame: 0.000000000 seconds]
[Time since reference or first frame: 0.000000000 seconds]
Frame Number: 1
Frame Length: 47 bytes
Capture Length: 47 bytes
[Frame is marked: False]
[Protocols in frame: eth:ip:udp:tftp]
[Coloring Rule Name: Checksum Errors]
[Coloring Rule String: cdp.checksum_bad==1 || edp.checksum_bad==1 ||
ip.checksum_bad==1 || tcp.checksum_bad==1 || udp.checksum_bad==1]
Ethernet II, Src: Dell_d1:2c:d5 (00:1e:4f:d1:2c:d5), Dst: 00:bd:33:06:68:22
(00:bd:33:06:68:22)
Destination: 00:bd:33:06:68:22 (00:bd:33:06:68:22)
Address: 00:bd:33:06:68:22 (00:bd:33:06:68:22)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address
(factory default)
Source: Dell_d1:2c:d5 (00:1e:4f:d1:2c:d5)
Address: Dell_d1:2c:d5 (00:1e:4f:d1:2c:d5)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address
(factory default)
Type: IP (0x0800)
Internet Protocol, Src: 133.38.20.50 (133.38.20.50), Dst: 133.38.20.150
(133.38.20.150)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 33
Identification: 0x4f94 (20372)
Flags: 0x04 (Don't Fragment)
0... = Reserved bit: Not set
.1.. = Don't fragment: Set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: UDP (0x11)
Header checksum: 0xb823 [correct]
[Good: True]
[Bad : False]
Source: 133.38.20.50 (133.38.20.50)
Destination: 133.38.20.150 (133.38.20.150)
User Datagram Protocol, Src Port: 41486 (41486), Dst Port: tftp (69)
Source port: 41486 (41486)
Destination port: tftp (69)
Length: 13
Checksum: 0x3333 [incorrect, should be 0x419b (maybe caused by "UDP
checksum offload"?)]
[Good Checksum: False]
[Bad Checksum: True]
Trivial File Transfer Protocol
Opcode: Unknown (28777)
Data (3 bytes)
No. Time Source Destination Protocol
Info
* 2 10:07:34.071477 00:bd:33:06:68:22 Broadcast
ARP Gratuitous ARP for 133.38.20.150 (Request)
*
Frame 2 (60 bytes on wire, 60 bytes captured)
Arrival Time: Jun 26, 2009 10:07:34.071477000
[Time delta from previous captured frame: 0.038475000 seconds]
[Time delta from previous displayed frame: 0.038475000 seconds]
[Time since reference or first frame: 0.038475000 seconds]
Frame Number: 2
Frame Length: 60 bytes
Capture Length: 60 bytes
[Frame is marked: False]
[Protocols in frame: eth:arp]
[Coloring Rule Name: ARP]
[Coloring Rule String: arp]
Ethernet II, Src: 00:bd:33:06:68:22 (00:bd:33:06:68:22), Dst: Broadcast
(ff:ff:ff:ff:ff:ff)
Destination: Broadcast (ff:ff:ff:ff:ff:ff)
Address: Broadcast (ff:ff:ff:ff:ff:ff)
.... ...1 .... .... .... .... = IG bit: Group address
(multicast/broadcast)
.... ..1. .... .... .... .... = LG bit: Locally administered address
(this is NOT the factory default)
Source: 00:bd:33:06:68:22 (00:bd:33:06:68:22)
Address: 00:bd:33:06:68:22 (00:bd:33:06:68:22)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address
(factory default)
Type: ARP (0x0806)
Trailer: 000000000000000000000000000000000000
Address Resolution Protocol (request/gratuitous ARP)
Hardware type: Ethernet (0x0001)
Protocol type: IP (0x0800)
Hardware size: 6
Protocol size: 4
Opcode: request (0x0001)
Sender MAC address: 00:bd:33:06:68:22 (00:bd:33:06:68:22)
Sender IP address: 133.38.20.150 (133.38.20.150)
Target MAC address: 00:00:00_00:00:00 (00:00:00:00:00:00)
Target IP address: 133.38.20.150 (133.38.20.150)
The trace seems good for me, but we can see on the wireshark log that *there
is not any udp packet send from the target*. I am asking too on the
gratuitous arp request ? Why the target is making this request ?
And what can prevent the lwip stack to send UDP packet on the network ?
Any advice on what I should check will be greetly appreciated.
Patrick Deflandre
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