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Miller" , Jakub Kicinski , Paolo Abeni , Eric Dumazet , Alexander Lobakin Cc: Ido Schimmel , Andrew Lunn , netdev@vger.kernel.org, Nicolas Dichtel Subject: [PATCH net-next v3 1/2] net: advertise 'netns local' property via netlink Date: Thu, 20 Feb 2025 14:02:35 +0100 Message-ID: <20250220130334.3583331-2-nicolas.dichtel@6wind.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250220130334.3583331-1-nicolas.dichtel@6wind.com> References: <20250220130334.3583331-1-nicolas.dichtel@6wind.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org Since commit 05c1280a2bcf ("netdev_features: convert NETIF_F_NETNS_LOCAL to dev->netns_local"), there is no way to see if the netns_local property is set on a device. Let's add a netlink attribute to advertise it. Signed-off-by: Nicolas Dichtel Reviewed-by: Eric Dumazet Reviewed-by: Alexander Lobakin Reviewed-by: Kuniyuki Iwashima --- Documentation/netlink/specs/rt_link.yaml | 3 +++ include/uapi/linux/if_link.h | 1 + net/core/rtnetlink.c | 3 +++ 3 files changed, 7 insertions(+) diff --git a/Documentation/netlink/specs/rt_link.yaml b/Documentation/netlink/specs/rt_link.yaml index 0d492500c7e5..a646d8a6bf9d 100644 --- a/Documentation/netlink/specs/rt_link.yaml +++ b/Documentation/netlink/specs/rt_link.yaml @@ -1148,6 +1148,9 @@ attribute-sets: name: max-pacing-offload-horizon type: uint doc: EDT offload horizon supported by the device (in nsec). + - + name: netns-local + type: u8 - name: af-spec-attrs attributes: diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h index bfe880fbbb24..ed4a64e1c8f1 100644 --- a/include/uapi/linux/if_link.h +++ b/include/uapi/linux/if_link.h @@ -378,6 +378,7 @@ enum { IFLA_GRO_IPV4_MAX_SIZE, IFLA_DPLL_PIN, IFLA_MAX_PACING_OFFLOAD_HORIZON, + IFLA_NETNS_LOCAL, __IFLA_MAX }; diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index abe1a461ea67..acf787e4d22d 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -1292,6 +1292,7 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev, + nla_total_size(4) /* IFLA_TSO_MAX_SEGS */ + nla_total_size(1) /* IFLA_OPERSTATE */ + nla_total_size(1) /* IFLA_LINKMODE */ + + nla_total_size(1) /* IFLA_NETNS_LOCAL */ + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ + nla_total_size(4) /* IFLA_LINK_NETNSID */ + nla_total_size(4) /* IFLA_GROUP */ @@ -2046,6 +2047,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, netif_running(dev) ? 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Thu, 20 Feb 2025 05:03:36 -0800 (PST) Received: from smtpservice.6wind.com ([185.13.181.2]) by smtp-relay.gmail.com with ESMTP id 2adb3069b0e04-54529701d03sm562975e87.30.2025.02.20.05.03.36; Thu, 20 Feb 2025 05:03:36 -0800 (PST) X-Relaying-Domain: 6wind.com Received: from bretzel (bretzel.dev.6wind.com [10.17.1.57]) by smtpservice.6wind.com (Postfix) with ESMTPS id 4F6D11352F; Thu, 20 Feb 2025 14:03:36 +0100 (CET) Received: from dichtel by bretzel with local (Exim 4.94.2) (envelope-from ) id 1tl6DI-00F2Dm-2J; Thu, 20 Feb 2025 14:03:36 +0100 From: Nicolas Dichtel To: "David S . Miller" , Jakub Kicinski , Paolo Abeni , Eric Dumazet , Alexander Lobakin Cc: Ido Schimmel , Andrew Lunn , netdev@vger.kernel.org, Nicolas Dichtel Subject: [PATCH net-next v3 2/2] net: plumb extack in __dev_change_net_namespace() Date: Thu, 20 Feb 2025 14:02:36 +0100 Message-ID: <20250220130334.3583331-3-nicolas.dichtel@6wind.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250220130334.3583331-1-nicolas.dichtel@6wind.com> References: <20250220130334.3583331-1-nicolas.dichtel@6wind.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org It could be hard to understand why the netlink command fails. For example, if dev->netns_local is set, the error is "Invalid argument". Signed-off-by: Nicolas Dichtel Reviewed-by: Eric Dumazet --- include/linux/netdevice.h | 5 +++-- net/core/dev.c | 41 +++++++++++++++++++++++++++++++-------- net/core/rtnetlink.c | 2 +- 3 files changed, 37 insertions(+), 11 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index fccc03cd2164..58d9f052f154 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -4155,12 +4155,13 @@ int dev_change_flags(struct net_device *dev, unsigned int flags, int dev_set_alias(struct net_device *, const char *, size_t); int dev_get_alias(const struct net_device *, char *, size_t); int __dev_change_net_namespace(struct net_device *dev, struct net *net, - const char *pat, int new_ifindex); + const char *pat, int new_ifindex, + struct netlink_ext_ack *extack); static inline int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) { - return __dev_change_net_namespace(dev, net, pat, 0); + return __dev_change_net_namespace(dev, net, pat, 0, NULL); } int __dev_set_mtu(struct net_device *, int); int dev_set_mtu(struct net_device *, int); diff --git a/net/core/dev.c b/net/core/dev.c index ebc000b56828..9605fa2e7415 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -11917,6 +11917,7 @@ EXPORT_SYMBOL(unregister_netdev); * is already taken in the destination network namespace. * @new_ifindex: If not zero, specifies device index in the target * namespace. + * @extack: netlink extended ack * * This function shuts down a device interface and moves it * to a new network namespace. On success 0 is returned, on @@ -11926,7 +11927,8 @@ EXPORT_SYMBOL(unregister_netdev); */ int __dev_change_net_namespace(struct net_device *dev, struct net *net, - const char *pat, int new_ifindex) + const char *pat, int new_ifindex, + struct netlink_ext_ack *extack) { struct netdev_name_node *name_node; struct net *net_old = dev_net(dev); @@ -11937,12 +11939,17 @@ int __dev_change_net_namespace(struct net_device *dev, struct net *net, /* Don't allow namespace local devices to be moved. */ err = -EINVAL; - if (dev->netns_local) + if (dev->netns_local) { + NL_SET_ERR_MSG(extack, + "The interface has the 'netns local' property"); goto out; + } /* Ensure the device has been registered */ - if (dev->reg_state != NETREG_REGISTERED) + if (dev->reg_state != NETREG_REGISTERED) { + NL_SET_ERR_MSG(extack, "The interface isn't registered"); goto out; + } /* Get out if there is nothing todo */ err = 0; @@ -11955,30 +11962,48 @@ int __dev_change_net_namespace(struct net_device *dev, struct net *net, err = -EEXIST; if (netdev_name_in_use(net, dev->name)) { /* We get here if we can't use the current device name */ - if (!pat) + if (!pat) { + NL_SET_ERR_MSG(extack, + "An interface with the same name exists in the target netns"); goto out; + } err = dev_prep_valid_name(net, dev, pat, new_name, EEXIST); - if (err < 0) + if (err < 0) { + NL_SET_ERR_MSG_FMT(extack, + "Unable to use '%s' for the new interface name", + pat); goto out; + } } /* Check that none of the altnames conflicts. */ err = -EEXIST; netdev_for_each_altname(dev, name_node) - if (netdev_name_in_use(net, name_node->name)) + if (netdev_name_in_use(net, name_node->name)) { + NL_SET_ERR_MSG_FMT(extack, + "An interface with the altname %s exists in the target netns", + name_node->name); goto out; + } /* Check that new_ifindex isn't used yet. */ if (new_ifindex) { err = dev_index_reserve(net, new_ifindex); - if (err < 0) + if (err < 0) { + NL_SET_ERR_MSG_FMT(extack, + "The ifindex %d is not available in the target netns", + new_ifindex); goto out; + } } else { /* If there is an ifindex conflict assign a new one */ err = dev_index_reserve(net, dev->ifindex); if (err == -EBUSY) err = dev_index_reserve(net, 0); - if (err < 0) + if (err < 0) { + NL_SET_ERR_MSG(extack, + "Unable to allocate a new ifindex in the target netns"); goto out; + } new_ifindex = err; } diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index acf787e4d22d..717f2e3e333e 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -3028,7 +3028,7 @@ static int do_setlink(const struct sk_buff *skb, struct net_device *dev, new_ifindex = nla_get_s32_default(tb[IFLA_NEW_IFINDEX], 0); - err = __dev_change_net_namespace(dev, tgt_net, pat, new_ifindex); + err = __dev_change_net_namespace(dev, tgt_net, pat, new_ifindex, extack); if (err) goto errout;