Date: Sat, 16 Feb 2008 21:29:35 +0400 From: Tofig Suleymanov <tofig@freebsd.az> To: Max Laier <max@love2party.net> Cc: hackers@freebsd.org Subject: Re: if_start() and sending packets problem Message-ID: <47B71D7F.9070804@freebsd.az> In-Reply-To: <35810.192.168.4.151.1203169657.squirrel@router.laiers.local> References: <342414370802160011s7fc3edc2w5feb45ce788930c5@mail.gmail.com> <35810.192.168.4.151.1203169657.squirrel@router.laiers.local>
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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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