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Date: Wed, 20 May 2009 20:51:03 +0100 From: Ben Hutchings <bhutchings@...arflare.com> To: Rami Rosen <ramirose@...il.com> Cc: netdev@...r.kernel.org Subject: Re: Question about /proc/net/netlink mystery On Wed, 2009-05-20 at 22:22 +0300, Rami Rosen wrote: > Hi, > I tried to figure this out, but something is mysterious here to me. > > cat /proc/net/netlink > shows: > sk Eth Pid Groups Rmem Wmem Dump Locks > > Why is the Eth here in the second column title? > It does not seem that this column has anything to do with network > interfaces. > > A short look to the code, in netlink_seq_show() , net/netlink/af_netlink.c, > will show that the values in this column are s->sk_protocol. I would guess that "Eth" is meant to be short for "Ethertype", a layer-3 protocol number, although sock::sk_protocol actually holds a layer-4 protocol number. > So it seems that the title should be here different; it should represent > the protocol (since s->sk_protocol is assigned > the number of the protocol of the netlink socket ; > for example, NETLINK_ROUTE is 0, NETLINK_AUDIT is 9, and so on ; (see > include/linux/netfilter.h) > > So shouldn't it be something like "Proto"? Yes, but changing column names in /proc risks breaking the programs that read them. Ben. -- Ben Hutchings, Senior Software Engineer, Solarflare Communications Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. -- 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
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