netdev - Re: [PATCH] netlink.7: describe netlink socket options

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Date:	Sun, 12 Jun 2016 13:21:36 +0200
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	Andrey Vagin <avagin@...nvz.org>
Cc:	mtk.manpages@...il.com, netdev@...r.kernel.org,
	linux-man@...r.kernel.org, Kir Kolyshkin <kir@...nvz.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Patrick McHardy <kaber@...sh.net>,
	Christophe Ricard <christophe.ricard@...il.com>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Subject: Re: [PATCH] netlink.7: describe netlink socket options

Hi Andrey,

On 06/10/2016 10:28 PM, Andrey Vagin wrote:
> Cc: Kir Kolyshkin <kir@...nvz.org>
> Cc: Michael Kerrisk <mtk.manpages@...il.com>
> Cc: Herbert Xu <herbert@...dor.apana.org.au>
> Cc: Patrick McHardy <kaber@...sh.net>
> Cc: Christophe Ricard <christophe.ricard@...il.com>
> Cc: Nicolas Dichtel <nicolas.dichtel@...nd.com>
> Signed-off-by: Andrey Vagin <avagin@...nvz.org>
> ---
>  man7/netlink.7 | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 75 insertions(+)


Thanks for the nicely done patch. Applied!

Cheers,

Michael


> diff --git a/man7/netlink.7 b/man7/netlink.7
> index 513f854..b4848df 100644
> --- a/man7/netlink.7
> +++ b/man7/netlink.7
> @@ -368,6 +368,81 @@ and
>  .BR NETLINK_SELINUX
>  groups allow other users to receive messages.
>  No groups allow other users to send messages.
> +
> +.SS Socket options
> +To set or get a netlink socket option, call
> +.BR getsockopt (2)
> +to read or
> +.BR setsockopt (2)
> +to write the option with the option level argument set to
> +.BR SOL_NETLINK .
> +Unless otherwise noted,
> +.I optval
> +is a pointer to an
> +.IR int .
> +.TP
> +.BR NETLINK_PKTINFO " (since Linux 2.6.14)"
> +Enable
> +.B nl_pktinfo
> +control messages for received packets to get the extended
> +destination group number.
> +.TP
> +.BR NETLINK_ADD_MEMBERSHIP ,\  NETLINK_DROP_MEMBERSHIP " (since Linux 2.6.14)"
> +Join/leave a group specified by
> +.IR optval .
> +.\"	commit 9a4595bc7e67962f13232ee55a64e063062c3a99
> +.\"	Author: Patrick McHardy <kaber@...sh.net>
> +.TP
> +.BR NETLINK_LIST_MEMBERSHIPS " (since Linux 4.2)"
> +Retrieve all groups a socket is a member of.
> +.I optval
> +is a pointer to
> +.B __u32
> +and
> +.I optlen
> +is the size of the array. The array is filled with the full membership set of the
> +socket, and the required array size is returned in
> +.I optlen.
> +.\"	commit b42be38b2778eda2237fc759e55e3b698b05b315
> +.\"	Author: David Herrmann <dh.herrmann@...il.com>
> +.TP
> +.BR NETLINK_BROADCAST_ERROR " (since Linux 2.6.30)"
> +When not set,
> +.B netlink_broadcast()
> +only reports
> +.B ESRCH
> +errors and silently ignore
> +.B NOBUFS
> +errors.
> +.\"	commit be0c22a46cfb79ab2342bb28fde99afa94ef868e
> +.\"	Author: Pablo Neira Ayuso <pablo@...filter.org>
> +.TP
> +.BR NETLINK_NO_ENOBUFS " (since Linux 2.6.30)"
> +This flag can be used by unicast and broadcast listeners to avoid receiving
> +.B ENOBUFS
> +errors.
> +.\"	commit 38938bfe3489394e2eed5e40c9bb8f66a2ce1405
> +.\"	Author: Pablo Neira Ayuso <pablo@...filter.org>
> +.TP
> +.BR NETLINK_LISTEN_ALL_NSID " (since Linux 4.2)"
> +When set, this socket will receive netlink notifications from all network namespaces that
> +have an
> +.I nsid
> +assigned into the network namespace where the socket has been opened. The
> +.I nsid
> +is sent to user space via an ancillary data.
> +.\"	commit 59324cf35aba5336b611074028777838a963d03b
> +.\"	Author: Nicolas Dichtel <nicolas.dichtel@...nd.com>
> +.TP
> +.BR NETLINK_CAP_ACK " (since Linux 4.2)"
> +The kernel may fail to allocate the necessary room for the acknowledgment
> +message back to userspace. This option trims off the payload of the original
> +netlink message.
> +The netlink message header is still included, so the user can guess from the
> +sequence number what is the message that has triggered the acknowledgment.
> +.\"	commit 0a6a3a23ea6efde079a5b77688541a98bf202721
> +.\"	Author: Christophe Ricard <christophe.ricard@...il.com>
> +
>  .SH VERSIONS
>  The socket interface to netlink is a new feature of Linux 2.2.
>  
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/