[{"id":1772706,"web_url":"http://patchwork.ozlabs.org/comment/1772706/","msgid":"<24470459-704b-89a2-648a-bbd4d3a1aebb@cumulusnetworks.com>","list_archive_url":null,"date":"2017-09-21T11:19:10","subject":"Re: [patch net-next 03/12] ipmr: Add FIB notification access\n\tfunctions","submitter":{"id":66448,"url":"http://patchwork.ozlabs.org/api/people/66448/","name":"Nikolay Aleksandrov","email":"nikolay@cumulusnetworks.com"},"content":"On 21/09/17 09:43, Jiri Pirko wrote:\n> From: Yotam Gigi \n> \n> Make the ipmr module register as a FIB notifier. To do that, implement both\n> the ipmr_seq_read and ipmr_dump ops.\n> \n> The ipmr_seq_read op returns a sequence counter that is incremented on\n> every notification related operation done by the ipmr. To implement that,\n> add a sequence counter in the netns_ipv4 struct and increment it whenever a\n> new MFC route or VIF are added or deleted. The sequence operations are\n> protected by the RTNL lock.\n> \n> The ipmr_dump iterates the list of MFC routes and the list of VIF entries\n> and sends notifications about them. The entries dump is done under RCU.\n> \n> Signed-off-by: Yotam Gigi \n> Reviewed-by: Ido Schimmel \n> Signed-off-by: Jiri Pirko \n> ---\n> include/linux/mroute.h | 15 ++++++\n> include/net/netns/ipv4.h | 3 ++\n> net/ipv4/ipmr.c | 135 ++++++++++++++++++++++++++++++++++++++++++++++-\n> 3 files changed, 151 insertions(+), 2 deletions(-)\n> \n[snip]\n> +\n> +static int ipmr_dump(struct net *net, struct notifier_block *nb)\n> +{\n> +\tstruct mr_table *mrt;\n> +\tint err;\n> +\n> +\terr = ipmr_rules_dump(net, nb);\n> +\tif (err)\n> +\t\treturn err;\n> +\n> +\tipmr_for_each_table(mrt, net) {\n> +\t\tstruct vif_device *v = &mrt->vif_table[0];\n> +\t\tstruct mfc_cache *mfc;\n> +\t\tint vifi;\n> +\n> +\t\t/* Notifiy on table VIF entries */\n> +\t\tfor (vifi = 0; vifi < mrt->maxvif; vifi++, v++) {\n> +\t\t\tif (!v->dev)\n> +\t\t\t\tcontinue;\n> +\n> +\t\t\tcall_ipmr_vif_entry_notifier(nb, net, FIB_EVENT_VIF_ADD,\n> +\t\t\t\t\t\t v, vifi, mrt->id);\n> +\t\t}\n\nThe VIF table is protected by mrt_lock (rwlock), here with RCU only\nyou're not guaranteed to keep v->dev. It can become NULL after the check above.\nFor details you can see vif_delete() in net/ipv4/ipmr.c. You need at least\nmrt_lock for reading.\n\n> +\n> +\t\t/* Notify on table MFC entries */\n> +\t\tlist_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list)\n> +\t\t\tcall_ipmr_mfc_entry_notifier(nb, net,\n> +\t\t\t\t\t\t FIB_EVENT_ENTRY_ADD, mfc,\n> +\t\t\t\t\t\t mrt->id);\n> +\t}\n> +\n> +\treturn 0;\n> +}\n> +\n> +static const struct fib_notifier_ops ipmr_notifier_ops_template = {\n> +\t.family\t\t= RTNL_FAMILY_IPMR,\n> +\t.fib_seq_read\t= ipmr_seq_read,\n> +\t.fib_dump\t= ipmr_dump,\n> +\t.owner\t\t= THIS_MODULE,\n> +};\n> +\n> +int __net_init ipmr_notifier_init(struct net *net)\n> +{\n> +\tstruct fib_notifier_ops *ops;\n> +\n> +\tnet->ipv4.ipmr_seq = 0;\n> +\n> +\tops = fib_notifier_ops_register(&ipmr_notifier_ops_template, net);\n> +\tif (IS_ERR(ops))\n> +\t\treturn PTR_ERR(ops);\n> +\tnet->ipv4.ipmr_notifier_ops = ops;\n> +\n> +\treturn 0;\n> +}\n> +\n> +static void __net_exit ipmr_notifier_exit(struct net *net)\n> +{\n> +\tfib_notifier_ops_unregister(net->ipv4.ipmr_notifier_ops);\n> +\tnet->ipv4.ipmr_notifier_ops = NULL;\n> +}\n> +\n> /* Setup for IP multicast routing */\n> static int __net_init ipmr_net_init(struct net *net)\n> {\n> \tint err;\n> \n> +\terr = ipmr_notifier_init(net);\n> +\tif (err)\n> +\t\tgoto ipmr_notifier_fail;\n> +\n> \terr = ipmr_rules_init(net);\n> \tif (err < 0)\n> -\t\tgoto fail;\n> +\t\tgoto ipmr_rules_fail;\n> \n> #ifdef CONFIG_PROC_FS\n> \terr = -ENOMEM;\n> @@ -3074,7 +3202,9 @@ static int __net_init ipmr_net_init(struct net *net)\n> proc_vif_fail:\n> \tipmr_rules_exit(net);\n> #endif\n> -fail:\n> +ipmr_rules_fail:\n> +\tipmr_notifier_exit(net);\n> +ipmr_notifier_fail:\n> \treturn err;\n> }\n> \n> @@ -3084,6 +3214,7 @@ static void __net_exit ipmr_net_exit(struct net *net)\n> \tremove_proc_entry(\"ip_mr_cache\", net->proc_net);\n> \tremove_proc_entry(\"ip_mr_vif\", net->proc_net);\n> #endif\n> +\tipmr_notifier_exit(net);\n> \tipmr_rules_exit(net);\n> }\n> \n>","headers":{"Return-Path":"","X-Original-To":"patchwork-incoming@ozlabs.org","Delivered-To":"patchwork-incoming@ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=netdev-owner@vger.kernel.org;\n\treceiver=)","ozlabs.org; dkim=pass (1024-bit key;\n\tunprotected) header.d=cumulusnetworks.com\n\theader.i=@cumulusnetworks.com header.b=\"ZD2/oeju\"; \n\tdkim-atps=neutral"],"Received":["from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xyYz9621nz9t3m\n\tfor ;\n\tThu, 21 Sep 2017 21:19:17 +1000 (AEST)","(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1751679AbdIULTP (ORCPT );\n\tThu, 21 Sep 2017 07:19:15 -0400","from mail-wr0-f182.google.com ([209.85.128.182]:51289 \"EHLO\n\tmail-wr0-f182.google.com\" rhost-flags-OK-OK-OK-OK) by vger.kernel.org\n\twith ESMTP id S1751652AbdIULTO (ORCPT\n\t); Thu, 21 Sep 2017 07:19:14 -0400","by mail-wr0-f182.google.com with SMTP id z39so4286412wrb.8\n\tfor ; Thu, 21 Sep 2017 04:19:13 -0700 (PDT)","from [192.168.0.103] (46-10-142-144.ip.btc-net.bg. 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To do that, implement both\n>> the ipmr_seq_read and ipmr_dump ops.\n>>\n>> The ipmr_seq_read op returns a sequence counter that is incremented on\n>> every notification related operation done by the ipmr. To implement that,\n>> add a sequence counter in the netns_ipv4 struct and increment it whenever a\n>> new MFC route or VIF are added or deleted. The sequence operations are\n>> protected by the RTNL lock.\n>>\n>> The ipmr_dump iterates the list of MFC routes and the list of VIF entries\n>> and sends notifications about them. The entries dump is done under RCU.\n>>\n>> Signed-off-by: Yotam Gigi \n>> Reviewed-by: Ido Schimmel \n>> Signed-off-by: Jiri Pirko \n>> ---\n>> include/linux/mroute.h | 15 ++++++\n>> include/net/netns/ipv4.h | 3 ++\n>> net/ipv4/ipmr.c | 135 ++++++++++++++++++++++++++++++++++++++++++++++-\n>> 3 files changed, 151 insertions(+), 2 deletions(-)\n>>\n> [snip]\n>> +\n>> +static int ipmr_dump(struct net *net, struct notifier_block *nb)\n>> +{\n>> +\tstruct mr_table *mrt;\n>> +\tint err;\n>> +\n>> +\terr = ipmr_rules_dump(net, nb);\n>> +\tif (err)\n>> +\t\treturn err;\n>> +\n>> +\tipmr_for_each_table(mrt, net) {\n>> +\t\tstruct vif_device *v = &mrt->vif_table[0];\n>> +\t\tstruct mfc_cache *mfc;\n>> +\t\tint vifi;\n>> +\n>> +\t\t/* Notifiy on table VIF entries */\n>> +\t\tfor (vifi = 0; vifi < mrt->maxvif; vifi++, v++) {\n>> +\t\t\tif (!v->dev)\n>> +\t\t\t\tcontinue;\n>> +\n>> +\t\t\tcall_ipmr_vif_entry_notifier(nb, net, FIB_EVENT_VIF_ADD,\n>> +\t\t\t\t\t\t v, vifi, mrt->id);\n>> +\t\t}\n> The VIF table is protected by mrt_lock (rwlock), here with RCU only\n> you're not guaranteed to keep v->dev. It can become NULL after the check above.\n> For details you can see vif_delete() in net/ipv4/ipmr.c. You need at least\n> mrt_lock for reading.\n\nHmm, that's interesting. That situation would lead the dump to be inconsistent,\nthus eventually discarded, right? So I can also just make sure that the driver\nignores dev=NULL notifications and that would be enough to solve it.\n\nI have to think about it a bit more, but anyway, maybe taking the mrt_lock for\nthe VIF dump is the right solution here.\n\nAnyway, thanks for the review!\n\n\n>> +\n>> +\t\t/* Notify on table MFC entries */\n>> +\t\tlist_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list)\n>> +\t\t\tcall_ipmr_mfc_entry_notifier(nb, net,\n>> +\t\t\t\t\t\t FIB_EVENT_ENTRY_ADD, mfc,\n>> +\t\t\t\t\t\t mrt->id);\n>> +\t}\n>> +\n>> +\treturn 0;\n>> +}\n>> +\n>> +static const struct fib_notifier_ops ipmr_notifier_ops_template = {\n>> +\t.family\t\t= RTNL_FAMILY_IPMR,\n>> +\t.fib_seq_read\t= ipmr_seq_read,\n>> +\t.fib_dump\t= ipmr_dump,\n>> +\t.owner\t\t= THIS_MODULE,\n>> +};\n>> +\n>> +int __net_init ipmr_notifier_init(struct net *net)\n>> +{\n>> +\tstruct fib_notifier_ops *ops;\n>> +\n>> +\tnet->ipv4.ipmr_seq = 0;\n>> +\n>> +\tops = fib_notifier_ops_register(&ipmr_notifier_ops_template, net);\n>> +\tif (IS_ERR(ops))\n>> +\t\treturn PTR_ERR(ops);\n>> +\tnet->ipv4.ipmr_notifier_ops = ops;\n>> +\n>> +\treturn 0;\n>> +}\n>> +\n>> +static void __net_exit ipmr_notifier_exit(struct net *net)\n>> +{\n>> +\tfib_notifier_ops_unregister(net->ipv4.ipmr_notifier_ops);\n>> +\tnet->ipv4.ipmr_notifier_ops = NULL;\n>> +}\n>> +\n>> /* Setup for IP multicast routing */\n>> static int __net_init ipmr_net_init(struct net *net)\n>> {\n>> \tint err;\n>> \n>> +\terr = ipmr_notifier_init(net);\n>> +\tif (err)\n>> +\t\tgoto ipmr_notifier_fail;\n>> +\n>> \terr = ipmr_rules_init(net);\n>> \tif (err < 0)\n>> -\t\tgoto fail;\n>> +\t\tgoto ipmr_rules_fail;\n>> \n>> #ifdef CONFIG_PROC_FS\n>> \terr = -ENOMEM;\n>> @@ -3074,7 +3202,9 @@ static int __net_init ipmr_net_init(struct net *net)\n>> proc_vif_fail:\n>> \tipmr_rules_exit(net);\n>> #endif\n>> -fail:\n>> +ipmr_rules_fail:\n>> +\tipmr_notifier_exit(net);\n>> +ipmr_notifier_fail:\n>> \treturn err;\n>> }\n>> \n>> @@ -3084,6 +3214,7 @@ static void __net_exit ipmr_net_exit(struct net *net)\n>> \tremove_proc_entry(\"ip_mr_cache\", net->proc_net);\n>> \tremove_proc_entry(\"ip_mr_vif\", net->proc_net);\n>> #endif\n>> +\tipmr_notifier_exit(net);\n>> \tipmr_rules_exit(net);\n>> }\n>> \n>>","headers":{"Return-Path":"","X-Original-To":"patchwork-incoming@ozlabs.org","Delivered-To":"patchwork-incoming@ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; 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