Hello Nick, tun.c:460: case TUNSETNOCSUM: tun.c:461: /* Disable/Enable checksum */ tun.c:462: if (arg) tun.c:463: tun->flags |= TUN_NOCHECKSUM; tun.c:464: else tun.c:465: tun->flags &= ~TUN_NOCHECKSUM; tun.c:466: tun.c:467: DBG(KERN_INFO "%s: checksum %s\n", tun.c:468: tun->name, arg ? "disabled" : "enabled"); tun.c:469: break; tun.c:470:
tun.c:216: if (tun->flags & TUN_NOCHECKSUM) tun.c:217: skb->ip_summed = CHECKSUM_UNNECESSARY; You'll see both ip_summed and CHECKSUM_UNNECESSARY in the sk_buff.h file in the kernel source. The behaviour invoked by tun.c:217 seems to disable checking as per skbuff.h:1350 or so. So yeah, I agree. There is no better place to ask questions like this, because the volume of such questions is so low that it doesn't warrant a different list. - bish Nick Martin wrote: > Hello, > > I was looking at the if_tun.h header file to try and find out what all > the ioctls for tun do, but I couldn't find anything that documents them. > Is there anywhere else I should be looking? > > Specifically, I wanted to know what TUNSETNOCSUM does. This appears in > both the example programs in the documentation. I'm guessing it's tun > set no checksum, but what exactly does that mean? > > Apologies if this is the wrong place to be asking this question. Any > help would be appreciated. Thanks. > > Regards, > > Nick Martin > > ------------------------------------------------------------------------------ > Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA > -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise > -Strategies to boost innovation and cut costs with open source participation > -Receive a $600 discount off the registration fee with the source code: SFAD > http://p.sf.net/sfu/XcvMzF8H > _______________________________________________ > VTun-devel mailing list > VTun-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/vtun-devel -- People don't know that vi was written for a world that doesn't exist anymore -- Bill Joy, creator of vi http://www.theregister.co.uk/2003/09/11/bill_joys_greatest_gift/ ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ VTun-devel mailing list VTun-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/vtun-devel
