netdev - Re: ping -I eth1 ....

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Message-ID: <OF22F5901E.A7276220-ONC12577D2.004C79CB-C12577D2.004D1571@transmode.se>
Date:	Fri, 5 Nov 2010 15:01:57 +0100
From:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: ping -I eth1 ....

Eric Dumazet <eric.dumazet@...il.com> wrote on 2010/11/05 14:36:46:
>
> Le vendredi 05 novembre 2010 à 14:14 +0100, Joakim Tjernlund a écrit :
> > If I do busybox ping -I eth1 x.x.y.y i see
> > socket(PF_INET, SOCK_RAW, IPPROTO_ICMP) = 3
> > getuid()                                = 0
> > setuid(0)                               = 0
> > setsockopt(3, SOL_SOCKET, SO_BINDTODEVICE, "eth1\0\0\0\0\0\0\0\0\0\0\0\0\20\0[l\0\0\0\2\20\7\354(\0"..., 32) = 0
> > setsockopt(3, SOL_SOCKET, SO_BROADCAST, [1], 4) = 0
> > setsockopt(3, SOL_SOCKET, SO_RCVBUF, [7280], 4) = 0
> >
> > ......
> > then this in a loop:
> > --- SIGALRM (Alarm clock) @ 0 (0) ---
> > clock_gettime(CLOCK_MONOTONIC, {1238, 116470107}) = 0
> > sendto(3, "\10\0\203\345\1\326\0\2I\314(v\0\0\0\0\0\0\0\0\0\0\0\0"..., 64, 0, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("1.1.1.1")}, 16) = 64
> > rt_sigaction(SIGALRM, {0x10017034, [ALRM], SA_RESTART}, {0x10017034, [ALRM], SA_RESTART}, 8) = 0
> > alarm(1)                                = 0
> > sigreturn()                             = ? (mask now [ILL ABRT FPE KILL ALRM STKFLT CONT STOP TTOU URG XCPU XFSZ VTALRM PROF WINCH IO PWR RTMIN])
> > recvfrom(3, 0xbfe6a620, 192, 0, 0xbfe6a6f0, 0xbfe6a70c) = ? ERESTARTSYS (To be restarted)
> >
> > Then I do ifconfig eth1 down
> > and I still see the same. Should not
> > sendto and/or revcfrom return some error as
> > the interface is down?
>
> Hmm, this reminds me one patch, yes...
>
> Search for " ipv4: remove all rt cache entries on UNREGISTER event"
>
> http://permalink.gmane.org/gmane.linux.network/173391

Ah, that does the trick. A few comments though:

1) I think you should include IFF_RUNNING too

2) This only affects the TX(sendtoo) path?
   The RX(recvfrom) should also get an error.

   Jocke

>
> I guess I should respin it for net-next-2.6

Yes, pretty please :)

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