Cc: Kir Kolyshkin <k...@openvz.org> Cc: Michael Kerrisk <mtk.manpa...@gmail.com> Cc: Herbert Xu <herb...@gondor.apana.org.au> Cc: Patrick McHardy <ka...@trash.net> Cc: Christophe Ricard <christophe.ric...@gmail.com> Cc: Nicolas Dichtel <nicolas.dich...@6wind.com> Signed-off-by: Andrey Vagin <ava...@openvz.org> --- man7/netlink.7 | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+)
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 <ka...@trash.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.herrm...@gmail.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 <pa...@netfilter.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 <pa...@netfilter.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.dich...@6wind.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.ric...@gmail.com> + .SH VERSIONS The socket interface to netlink is a new feature of Linux 2.2. -- 2.5.5
