Messages in this thread | | | Date | Mon, 08 Jun 2009 14:34:54 -0700 (PDT) | Subject | Re: SOCK_RAW does not receive broadcast (with VLAN unless PROMISC) | From | David Miller <> |
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From: Gil Beniamini <gil.beniamini@gmail.com> Date: Mon, 8 Jun 2009 21:05:25 +0300
> Dear Linux Experts, > > My application is using PF_PACKET and SOCK_RAW in order to receive all > Ethernet packets for the machine-unicast MAC plus all broadcast > packets (like ARP broadcast).
Please post networking questions and reports to netdev@vger.kernel.org which is where the networking experts are subscribed.
I am also fully aware of your problem as Linus Torvalds forwarded your report to me last week, you just need to be patient as I simply haven't had a chance to look into it yet.
> That worked OK with kernel 2.6.20 (Ubuntu 7.04 with or without VLAN). > > Now with kernel 2.6.28 (Ubuntu 9.04) it works OK only without-VLAN, > but with VLAN the application receive only packets for the > machine-unicast MAC, but no broadcast (like ARP broadcast) packets, > only if I set the socket to PROMISC mode, I start receive also > broadcast packets. > > To me it seems a bug, as SOCK_RAW should pass all ‘received’ packet > (including broadcast) to the application, without the need for PROMISC > (which cause my machine to receive other machine unicast packets, and > filter those by software)! > > The original application: > > sock=socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)); > memset((char *) &sockad, 0, sizeof(sockad)); > sockad.sll_family = PF_PACKET; > sockad.sll_protocol = htons(ETH_P_ALL); > sockad.sll_ifindex = ethreq.ifr_ifindex;//the relevant unit number > > > > Now the workaround is to set (unwanted) PROMISC mode: > > ioctl(sock,SIOCGIFFLAGS,ðreq); > ethreq.ifr_flags|=IFF_PROMISC; // why does 9.04 need this (+0x100) at > least once?! > ioctl(sock,SIOCSIFFLAGS,ðreq); > > > Many thanks in advance, > Gil Beniamini > gil.beniamini@gmail.com > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
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