Re: [lwip-users] Lwip Socket Library

[Dennis Sandwiese]

>> Thank you, Kieran. Most of the missing symbols went
>> away after making the following changes to lib
>> project:
>> 
>> - Add $(LWIPDIR)/core/raw.c to COREFILES 
>> - Add $(LWIPDIR)/core/ipv4/ip_frag.c to CORE4FILES 
>> - Add $(LWIPARCH)/*.c and $(LWIPARCH)/netif/*.c to
>> ARCHFILES
>> - Add the macros for enabling/disabling debugging
per
>> module to lwipopts.h
> 
> Thanks for the helpful list.
> 
>> But one symbol - sys_now - remains undefined. I
tried
>> setting NO_SYS to 1 in lwipopts.h, but that creates
>> many other cascading problems. Is there a way out
of
>> this problem?
> 
> sys_now() should be defined in one of the unix port
(architecture
> specific files), but doesn't seem to be.  I'm not
sure why not.  It only
> seems to be used in the delif.c file, which is not
necessary for most
> people - I think this just simulates a link of a
certain delay.  Try
> omitting that file and see if it helps.  Otherwise
take a look to see if

Thanks for the suggestion, Kieran. After removing
delif, I am able to build it without any missing
symbols. But I encountered a new problem - ip_input
was dropping all the packets it received because the
interface was not up. So I added a call to
netif_set_up after netif_set_default in _init and the
interface became responsive. However, when I try to
connect using an echo client, it seg faults. Please
see the trace below. Does this ring a bell for you?

tcpip_thread: IP packet 0xffeb838
ip_input: iphdr->dest 0xc0a80002 netif->ip_addr
0xc0a80002 (0xc0a80000, 0xc0a80000, 0x2) up:1 any:0
ip_input: packet accepted on interface tp
ip_input:
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
+-------------------------------+
|    28018      |010|       0   | (id, flags, offset)
+-------------------------------+
|   64  |    6  |    0x4c0a     | (ttl, proto, chksum)
+-------------------------------+
|  192  |  168  |    0  |    1  | (src)
+-------------------------------+
|  192  |  168  |    0  |    2  | (dest)
+-------------------------------+
ip_input: p->len 40 p->tot_len 40
TCP header:
+-------------------------------+
|    57784      |        7      | (src port, dest
port)
+-------------------------------+
|           3244626500          | (seq no)
+-------------------------------+
|           0000006511          | (ack no)
+-------------------------------+
|  5 |   |010000|      5840     | (hdrlen, flags (ACK
), win)
+-------------------------------+
|    0x48d8     |         0     | (chksum, urgp)
+-------------------------------+
pbuf_header: old 0xffeb8a2 new 0xffeb8b6 (-20)
inet_chksum_pseudo(): checksumming pbuf 0xffeb884 (has
next (nil))
inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
pbuf_header: old 0xffeb8b6 new 0xffeb8ca (-20)
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK
-+-+-+-+-+-+-+-+-+-+-+-+-+-+
State: SYN_RCVD
TCP connection established 57784 -> 7.
State: ESTABLISHED
sys_mbox_post: mbox 0x10012810 msg 0xffeb68c
tcp_receive: window update 5840
tcp_receive: slow start cwnd 129
tcp_receive: ACK for 6511, unacked->seqno 6510:6511
tcp_receive: removing 6510:6511 from pcb->unacked
tcp_receive: queuelen 1 ... sys_mbox_fetch: mbox
0x10012810 msg 0x4000
pbuf_free(0xffea75c)
pbuf_free: deallocating 0xffea75c
0 (after freeing unacked)
tcp_receive: pcb->rttest 0 rtseq 6510 ackno 6511
tcp_output: nothing to send ((nil))
tcp_output: snd_wnd 5840, cwnd 128, wnd 128, seg ==
NULL, ack 6511
pbuf_free(0xffeb884)
pbuf_free: deallocating 0xffeb884
State: ESTABLISHED
Segmentation fault

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