netdev - Re: [PATCH net-next] gro: introduce gro_mac_header

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

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20120206.120015.1104308784569339801.davem@davemloft.net>
Date:	Mon, 06 Feb 2012 12:00:15 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	ogerlitz@...lanox.com
Cc:	eric.dumazet@...il.com, sean.hefty@...el.com,
	herbert@...dor.hengli.com.au, linux-rdma@...r.kernel.org,
	shlomop@...lanox.com, roland@...nel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] gro: introduce gro_mac_header_len

From: Or Gerlitz <ogerlitz@...lanox.com>
Date: Mon, 6 Feb 2012 18:44:03 +0200

> As I wrote earlier on this thread, the reason is that in order to be
> able to xmit skb's for which the stack doesn't provide a neighbour,
> IPoIB makes sure to have extra INFINIBAND_ALEN bytes headroom on
> skbs. Such that the ipoib hard_header functions writes a
> "ipoib_pseudoheader" (= hw address) on the skb and the xmit function
> grabs it from there and use that pseudoheader to search for the actual
> IB L2 address handle kept for that dest. Example such skbs are unicast
> ARP replies and multicast. see below some relevant code sections from
> ipoib_main.c

Then IPoIB is broken and must be fixed, see my other reply.

We're not adding a bogus member to the netdevice just because IPoIB
tries to do path resolution and neighbour validation behind the
neighbour cache's back.
--
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