Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754254AbaJBNsT (ORCPT ); Thu, 2 Oct 2014 09:48:19 -0400 Received: from 33.106-14-84.ripe.coltfrance.com ([84.14.106.33]:57437 "EHLO proxy.6wind.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752846AbaJBNsO (ORCPT ); Thu, 2 Oct 2014 09:48:14 -0400 From: Nicolas Dichtel To: netdev@vger.kernel.org, containers@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org Cc: davem@davemloft.net, ebiederm@xmission.com, stephen@networkplumber.org, akpm@linux-foundation.org, luto@amacapital.net, cwang@twopensource.com, Nicolas Dichtel Subject: [RFC PATCH net-next v3 2/4] rtnl: add link netns id to interface messages Date: Thu, 2 Oct 2014 15:48:08 +0200 Message-Id: <1412257690-31253-3-git-send-email-nicolas.dichtel@6wind.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1412257690-31253-1-git-send-email-nicolas.dichtel@6wind.com> References: <542D5726.8070308@6wind.com> <1412257690-31253-1-git-send-email-nicolas.dichtel@6wind.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds a new attribute (IFLA_LINK_NETNSID) which contains the 'link' netns id when this netns is different from the netns where the interface stands (for example for x-net interfaces like ip tunnels). When there is no id, we put NETNSA_NSINDEX_UNKNOWN into this attribute to indicate to userland that the link netns is different from the interface netns. Hence, userland knows that some information like IFLA_LINK are not interpretable. Signed-off-by: Nicolas Dichtel --- include/net/rtnetlink.h | 2 ++ include/uapi/linux/if_link.h | 1 + net/core/rtnetlink.c | 13 +++++++++++++ 3 files changed, 16 insertions(+) diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h index e21b9f9653c0..6c6d5393fc34 100644 --- a/include/net/rtnetlink.h +++ b/include/net/rtnetlink.h @@ -46,6 +46,7 @@ static inline int rtnl_msg_family(const struct nlmsghdr *nlh) * to create when creating a new device. * @get_num_rx_queues: Function to determine number of receive queues * to create when creating a new device. + * @get_link_net: Function to get the i/o netns of the device */ struct rtnl_link_ops { struct list_head list; @@ -93,6 +94,7 @@ struct rtnl_link_ops { int (*fill_slave_info)(struct sk_buff *skb, const struct net_device *dev, const struct net_device *slave_dev); + struct net *(*get_link_net)(const struct net_device *dev); }; int __rtnl_link_register(struct rtnl_link_ops *ops); diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h index 0bdb77e16875..938c0c02ed2e 100644 --- a/include/uapi/linux/if_link.h +++ b/include/uapi/linux/if_link.h @@ -145,6 +145,7 @@ enum { IFLA_CARRIER, IFLA_PHYS_PORT_ID, IFLA_CARRIER_CHANGES, + IFLA_LINK_NETNSID, __IFLA_MAX }; diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index a6882686ca3a..1b9329512496 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -862,6 +862,7 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev, + nla_total_size(1) /* IFLA_OPERSTATE */ + nla_total_size(1) /* IFLA_LINKMODE */ + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ + + nla_total_size(4) /* IFLA_LINK_NETNSID */ + nla_total_size(ext_filter_mask & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ @@ -1134,6 +1135,18 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, goto nla_put_failure; } + if (dev->rtnl_link_ops && + dev->rtnl_link_ops->get_link_net) { + struct net *link_net = dev->rtnl_link_ops->get_link_net(dev); + + if (!net_eq(dev_net(dev), link_net)) { + int id = peernet2id(dev_net(dev), link_net); + + if (nla_put_s32(skb, IFLA_LINK_NETNSID, id)) + goto nla_put_failure; + } + } + if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) goto nla_put_failure; -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/