Max Laier wrote:
Am Sa, 16.02.2008, 09:11, schrieb Tofig Suleymanov:
Hello hackers,
I will be grateful if someone could point me to the right direction
regarding the question below.
My device driver is getting incoming packets fine, but for some reason I
am not able to send a single packet. Here is the source code:
http://www.freebsd.az/if_ib.c
I've added several debug messages to the source and here is the output:
(bringing interface up and assigning the ip/netmask combination)
ifconfig ib0 192.168.0.6 netmask 255.255.255.0 up
(At this moment I get this in my /var/log/messages. It seems to be a
gratuitous arp who-has packet )
Feb 7 19:14:32 schizo kernel: ib_init entered
Feb 7 19:14:32 schizo kernel: ib_start entered
Feb 7 19:14:32 schizo kernel: ib_encap entered
Feb 7 19:14:32 schizo kernel: DHOST ff ff ff ff ff ff
Feb 7 19:14:32 schizo kernel: SHOST 0 c0 ee 22 3 14
Feb 7 19:14:32 schizo kernel: txeof entered
Feb 7 19:14:32 schizo kernel: txeof exiting
(now I try pinging, but no joy . I've added extra debug messages inside
ping.c)
schizo# ping 192.168.0.1
PING 192.168.0.1 (192.168.0.1): 56 data bytes
packets sent: -1
ping: sendto: Invalid argument
packets sent: -1
ping: sendto: Invalid argument
packets sent: -1
ping: sendto: Invalid argument
^C
--- 192.168.0.1 ping statistics ---
3 packets transmitted, 0 packets received, 100% packet loss
I have also tried to add debug messages to sys/net/if.c and
sys/net/netisr.c and it seems that the kernel doesn't even try to run my
ib_start() function.
Doing tcpdump on the interface and pinging does not show any packets
flowing. Please note that tcpdump shows the arp who-has request right
after I assign the ip address.
ifconfig ib0 gives the following:
ib0: flags=1008c3<UP,BROADCAST,RUNNING,NOARP,SIMPLEX,NEEDSGIANT> mtu 1500
Why do you set NOARP? It seems that your ping can't figure out the ARP
address of 192.168.0.1 and hence returns early. Either install a static
arp entry for 192.168.0.1 or lose the NOARP.
Good catch !
I've added a static arp entry as advised and now I am getting into
ib_start() and ib_encap() successfully !
Kind regards,
Tofig.
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