Messages in this thread | | | Date | Mon, 8 Jun 2009 21:05:25 +0300 | Subject | SOCK_RAW does not receive broadcast (with VLAN unless PROMISC) | From | Gil Beniamini <> |
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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).
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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