From patchwork Sun Oct 11 10:09:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sven Eckelmann X-Patchwork-Id: 18203 X-Patchwork-Delegate: sw@simonwunderlich.de Return-Path: X-Original-To: patchwork@open-mesh.org Delivered-To: patchwork@open-mesh.org Received: from diktynna.open-mesh.org (localhost [IPv6:::1]) by diktynna.open-mesh.org (Postfix) with ESMTP id A7F3C80B34; Sun, 11 Oct 2020 12:09:55 +0200 (CEST) Received: from dvalin.narfation.org (dvalin.narfation.org [IPv6:2a00:17d8:100::8b1]) by diktynna.open-mesh.org (Postfix) with ESMTPS id C779080244 for ; Sun, 11 Oct 2020 12:09:52 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=narfation.org; s=20121; t=1602410992; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=0n8mkfxu55lIQSJjgP/abSThGULofETFwXMmR+VnJS4=; b=HPFJ7dxiODyScNyXODbXOxcDk4wjZTu8ePF7hnRTbNutx9GKKW24rBlpExyEgqRzP72gNd tCV1XsX+AoY4bMeuCuBJeyJSXjs1YUGzyM4BW8JQXrsvHFM0/L+A1PGE1oDnie1IW4WnY4 aOzTLgS3LmU7cz8goB+s2nvw1LOuoVc= From: Sven Eckelmann To: b.a.t.m.a.n@lists.open-mesh.org Subject: [PATCH v2 2/2] batman-adv: Allow selection of routing algorithm over rtnetlink Date: Sun, 11 Oct 2020 12:09:41 +0200 Message-Id: <20201011100941.299742-2-sven@narfation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201011100941.299742-1-sven@narfation.org> References: <20201011100941.299742-1-sven@narfation.org> MIME-Version: 1.0 ARC-Seal: i=1; s=20121; d=open-mesh.org; t=1602410992; a=rsa-sha256; cv=none; b=bPJ2ddbT2vmPiWs3lPCAKQPMTQZAxplmmB37ke2hxhb/T3RzUarMP0DP5JSw8AWWSq7lCI uTn5fvBK7vDpOZXYlL834/OaCZRakueiihxCiRRcg3B7jtVnIXaraMEBs17O+kfuSwplui Y4rtRNJTpOhVH0CWnkNGa3pCrUdpBDU= ARC-Authentication-Results: i=1; diktynna.open-mesh.org; dkim=pass header.d=narfation.org header.s=20121 header.b=HPFJ7dxi; spf=pass (diktynna.open-mesh.org: domain of sven@narfation.org designates 2a00:17d8:100::8b1 as permitted sender) smtp.mailfrom=sven@narfation.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=open-mesh.org; s=20121; t=1602410992; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=0n8mkfxu55lIQSJjgP/abSThGULofETFwXMmR+VnJS4=; b=PQPDiKQtAa/h8AWsCnMIB1MajzF30kzwEDBV5vv/mMvUi+4MhQJRiOUb9WqoiSz1yKIcch xMkLxU91LtE5vCBLPu1BvaOkITdZhwreZ20VTXKUEwZAYoR/4fv6HzsUkGWLqxjq3GhpRF 8BqV8PM2tpGH0G4NvXAs7zDo5fvJix0= Message-ID-Hash: X3SAWN6AVRVO4HQOZDVHXAGOGGLVXXZZ X-Message-ID-Hash: X3SAWN6AVRVO4HQOZDVHXAGOGGLVXXZZ X-MailFrom: sven@narfation.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-b.a.t.m.a.n.lists.open-mesh.org-0; header-match-b.a.t.m.a.n.lists.open-mesh.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; suspicious-header CC: Annika Wickert X-Mailman-Version: 3.2.1 Precedence: list Reply-To: The list for a Better Approach To Mobile Ad-hoc Networking List-Id: The list for a Better Approach To Mobile Ad-hoc Networking Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: A batadv net_device is associated to a B.A.T.M.A.N. routing algorithm. This algorithm has to be selected before the interface is initialized and cannot be changed after that. The only way to select this algorithm was a module parameter which specifies the default algorithm used during the creation of the net_device. This module parameter is writeable over /sys/module/batman_adv/parameters/routing_algo and thus allows switching of the routing algorithm: 1. change routing_algo parameter 2. create new batadv net_device But this is not race free because another process can be scheduled between 1 + 2 and in that time frame change the routing_algo parameter again. It is much cleaner to directly provide this information inside the rtnetlink's RTM_NEWLINK message. The two processes would be (in regards of the creation parameter of their batadv interfaces) be isolated. This also eases the integration of batadv devices inside tools like network-manager or systemd-networkd which are not expecting to operate on /sys before a new net_device is created. Cc: Annika Wickert Signed-off-by: Sven Eckelmann --- include/uapi/linux/batman_adv.h | 6 ++++++ net/batman-adv/bat_algo.c | 10 ++++++++-- net/batman-adv/bat_algo.h | 3 ++- net/batman-adv/soft-interface.c | 34 ++++++++++++++++++++++++++++++--- 4 files changed, 47 insertions(+), 6 deletions(-) diff --git a/include/uapi/linux/batman_adv.h b/include/uapi/linux/batman_adv.h index b05399d8..bdb317fa 100644 --- a/include/uapi/linux/batman_adv.h +++ b/include/uapi/linux/batman_adv.h @@ -685,6 +685,12 @@ enum batadv_ifla_attrs { */ IFLA_BATADV_UNSPEC, + /** + * @IFLA_BATADV_ALGO_NAME: routing algorithm (name) which should be + * used by the newly registered batadv net_device. + */ + IFLA_BATADV_ALGO_NAME, + /* add attributes above here, update the policy in soft-interface.c */ /** diff --git a/net/batman-adv/bat_algo.c b/net/batman-adv/bat_algo.c index 382fbe51..500db94a 100644 --- a/net/batman-adv/bat_algo.c +++ b/net/batman-adv/bat_algo.c @@ -34,7 +34,13 @@ void batadv_algo_init(void) INIT_HLIST_HEAD(&batadv_algo_list); } -static struct batadv_algo_ops *batadv_algo_get(char *name) +/** + * batadv_algo_get() - Search for algorithm with specific name + * @name: algorithm name to find + * + * Return: Pointer to batadv_algo_ops on success, NULL otherwise + */ +struct batadv_algo_ops *batadv_algo_get(const char *name) { struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; @@ -97,7 +103,7 @@ int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) * * Return: 0 on success or negative error number in case of failure */ -int batadv_algo_select(struct batadv_priv *bat_priv, char *name) +int batadv_algo_select(struct batadv_priv *bat_priv, const char *name) { struct batadv_algo_ops *bat_algo_ops; diff --git a/net/batman-adv/bat_algo.h b/net/batman-adv/bat_algo.h index 686a60bc..2ae140ea 100644 --- a/net/batman-adv/bat_algo.h +++ b/net/batman-adv/bat_algo.h @@ -18,8 +18,9 @@ extern char batadv_routing_algo[]; extern struct list_head batadv_hardif_list; void batadv_algo_init(void); +struct batadv_algo_ops *batadv_algo_get(const char *name); int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops); -int batadv_algo_select(struct batadv_priv *bat_priv, char *name); +int batadv_algo_select(struct batadv_priv *bat_priv, const char *name); int batadv_algo_seq_print_text(struct seq_file *seq, void *offset); int batadv_algo_dump(struct sk_buff *msg, struct netlink_callback *cb); diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c index 9c7b8968..d96b4815 100644 --- a/net/batman-adv/soft-interface.c +++ b/net/batman-adv/soft-interface.c @@ -846,9 +846,11 @@ static int batadv_softif_init_late(struct net_device *dev) batadv_nc_init_bat_priv(bat_priv); - ret = batadv_algo_select(bat_priv, batadv_routing_algo); - if (ret < 0) - goto free_bat_counters; + if (!bat_priv->algo_ops) { + ret = batadv_algo_select(bat_priv, batadv_routing_algo); + if (ret < 0) + goto free_bat_counters; + } ret = batadv_debugfs_add_meshif(dev); if (ret < 0) @@ -1085,6 +1087,17 @@ static void batadv_softif_init_early(struct net_device *dev) static int batadv_softif_validate(struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { + struct batadv_algo_ops *algo_ops; + + if (!data) + return 0; + + if (data[IFLA_BATADV_ALGO_NAME]) { + algo_ops = batadv_algo_get(nla_data(data[IFLA_BATADV_ALGO_NAME])); + if (!algo_ops) + return -EINVAL; + } + return 0; } @@ -1102,6 +1115,20 @@ static int batadv_softif_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { + struct batadv_priv *bat_priv = netdev_priv(dev); + const char *algo_name; + int err; + + if (!data) + return 0; + + if (data[IFLA_BATADV_ALGO_NAME]) { + algo_name = nla_data(data[IFLA_BATADV_ALGO_NAME]); + err = batadv_algo_select(bat_priv, algo_name); + if (err) + return -EINVAL; + } + return register_netdevice(dev); } @@ -1204,6 +1231,7 @@ bool batadv_softif_is_valid(const struct net_device *net_dev) } static const struct nla_policy batadv_ifla_policy[IFLA_BATADV_MAX + 1] = { + [IFLA_BATADV_ALGO_NAME] = { .type = NLA_NUL_STRING }, }; struct rtnl_link_ops batadv_link_ops __read_mostly = {