lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Mon, 29 Jul 2013 11:21:31 -0700 From: Ben Greear <greearb@...delatech.com> To: netdev <netdev@...r.kernel.org> Subject: More details on why received UDP packets are treated as errors? We have a test case on 3.9.9+ (local patches applied) where sending from VETH interface, through peer VETH bridged (with our own emulator bridge module) to physical interface, which is then looped to another physical interface (B). The VETH and the wired B interface are sending UDP traffic to each other. Routing rules should be configured such that this all works appropriately. Replacing our bridging module with a user-space bridge has same behaviour. This setup works on the 3.7.y kernel, but we only get one-way traffic (B to VETH) on 3.9.9+. I sniffed the B port, and traffic appears to be sent and received properly (ie, no checksum errors, etc). But, our user-space app shows no received UDP frames on B, and netstat -s gives the output below. Is there any way to get more details about what these 'packet receive errors' are caused by using normal-ish tools? Udp: 6827 packets received 0 packets to unknown port received. 6172 packet receive errors 12964 packets sent 0 receive buffer errors 0 send buffer errors Tcp connections also fail to work, and I see these TCP stats. I'm sure not all of this is related to the problem at hand, but likely some of it is. Tcp: 81 active connections openings 11 passive connection openings 66 failed connection attempts 0 connection resets received 17 connections established 204643 segments received 229686 segments send out 465 segments retransmited 322 bad segments received. 70 resets sent Thanks, Ben -- Ben Greear <greearb@...delatech.com> Candela Technologies Inc http://www.candelatech.com -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists