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Miller" , Bobby Eshleman , Chris J Arges , Daniel Zahka , David Ahern , David Wei , Dimitri Daskalakis , Donald Hunter , Eric Dumazet , Gal Pressman , Jakub Kicinski , Paolo Abeni , Shuah Khan , Simon Horman , Stanislav Fomichev , Willem de Bruijn , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, netdev@vger.kernel.org Subject: Re: [PATCH net-next 0/2] ipv6: report why a route was deleted in RTM_DELROUTE Message-ID: <20260719065310.GB1841238@shredder> References: <20260717222327.7398-1-sigefriedhyy@gmail.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260717222327.7398-1-sigefriedhyy@gmail.com> X-ClientProxiedBy: FR4P281CA0025.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:c9::20) To SA3PR12MB7901.namprd12.prod.outlook.com (2603:10b6:806:306::12) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA3PR12MB7901:EE_|IA1PR12MB7757:EE_ X-MS-Office365-Filtering-Correlation-Id: 90cb03ff-c21f-4caf-6fad-08dee5626ace X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|23010399003|366016|1800799024|10067099003|11063799006|56012099006|18002099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?1N7Gmgpnqb+LA5ivBb/kQfJN4APGxJgKxv5UlbA1sUwcQxlyw1YrBVlZm4jj?= =?us-ascii?Q?8WGSf1vUGKIq/VFPMxPd6xi9o7zrK0mUztxG8Wu3+y0YvTMmZD1Vm7QwkF54?= =?us-ascii?Q?aa7ABBTFGl/U4O1kq4WVKCi46MAz/egpyaqN2He5Ssa1BCPgdvkXvscM4Ymf?= =?us-ascii?Q?m7fh4tugW9Pdj8Qw2j5/OjYUj8R4QkrTMlPEhKp+DKLPL3J8ayKU3PHewalC?= =?us-ascii?Q?wTJ1qZfjn1ukRzVSoQRAuuHf8vL8kVH8yH9B4PkQnvKO8IIl+myjJ0S7Lcu6?= =?us-ascii?Q?+4cWlShR1HsNx6NRWfj+nvcTJCaFzifhQDBId5yPq/U7h3Cut+Hgp34dgpga?= =?us-ascii?Q?QK+JRyDJQvy9YqDZha1xZYurjrhp0RZr5YL7e4JaUL9FTVRM6igbvRA4t3Pz?= =?us-ascii?Q?7hhRMtr89wFq8WqUZUHpEnqmbrLQ3aUN/3wZ6F+Sb7qnlf6VUflOzRpTiwED?= =?us-ascii?Q?bjq/YrBQ18jJkYFgJLREyL95MfN9dKoLHUKimhIcIBGWDOMMA+c4O696aP76?= =?us-ascii?Q?4LzI7QX16nXVDvvZ61U7XqNRYOL+K03gzv8pL2Mqcl/cqI4CmbEJAK4+UnRk?= =?us-ascii?Q?e8kwnJKgDfvY0LFXGH/1aAWTCZ9yOkZM1E0XZK2zO3SXDOX/w29aerdDoQC4?= =?us-ascii?Q?JQOUg1SEAvyYI7+hPOMgUxFaK/7NCapUQf0MQ/0wm3KlNhlUW31HcSJBsJUd?= =?us-ascii?Q?fQ54Vjw1+6GtrzXw3P+OYhg6G7RwHauAWpBnvt3QO7RhW71bFVkX/s+LTZln?= =?us-ascii?Q?apXlP1eFelX7t+2gGy8gDM36msV0BurE1R0u738ErnuwzceQL/1ilh66B7XH?= =?us-ascii?Q?8lVkB832bhdW/htQ7YEsOX+mkNExTs6Cd+FEJqSzIfm3Bv3zdj3KT6A8yu6Y?= =?us-ascii?Q?bd1oK0Vf2GxkrCvhmdx280N1XHXj36mRB9xK5goYJLbAP637tAsKJDCVnmSF?= =?us-ascii?Q?CUB6r0Cc1+jEzzMB+HaHxuliLzpISTRhEJjFuNpPF2pKa0YmNarE66TVILU9?= =?us-ascii?Q?5qxAwONEVLMVGqwcwE8v0VH76R/fgIAZIwKZNmpsMYd0RcztiOYhd+lmLCYg?= =?us-ascii?Q?7XDMDWDodNRq0bMOVlvi3R1cySJAQfP88FxT2KOYQ5W6gNSlF6fPjT8iPG40?= =?us-ascii?Q?3+9r02gKxF+9nc0Q7kudTroSI8TOBdwizHHRK3H78aVGQ2oGNAsW+AP7R955?= =?us-ascii?Q?ED2nu0kYKMgx3qYGeMEFghVyEDPsuRRsbCl2n+7Kcpg3YpsNsTatrijT1X3u?= =?us-ascii?Q?rX+0n0mETtDFrWZIDClKsgGqF3/LQDG2gQJu9HUd+HCtY0DFPoe6kqYvivF5?= =?us-ascii?Q?+li830K7EA+Zbc77vH3qWtuythvUnLC8pRX4XZirrphnpuPPBK1dXYEKARLa?= =?us-ascii?Q?iErNTSCn+AUhHSbtYA8yvN1RY8V2If57klQJNUN0TZJg7ZqhxkQqLAfN/uA1?= =?us-ascii?Q?R9CV0KA5PyxshTEBd1vQ8fcykPKS9P6RWdphHjtEgjyZi+6TRqV3gVJh3I9A?= =?us-ascii?Q?HOiIB+gU6IAWkZMQ/6y9r2BmrJ0MRUbKM3TA1zCDcp6cvsOA9/yxylFnOhhy?= =?us-ascii?Q?3S7LVNvCA1csiqoEcnTgcPiF9uBJ2ArnsdReM1ncBrrjpowHlPU8AG1pMLyC?= =?us-ascii?Q?IEr04LIcneoJoSButLzpOObnGha8D2ZqQ8Sy/GzmHEBZy4/rt36IPYZ4aqMO?= =?us-ascii?Q?683lGgNksADP2EstiZygG2X9bqpZvTRAd01wJVBjASipPTcJ?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 90cb03ff-c21f-4caf-6fad-08dee5626ace X-MS-Exchange-CrossTenant-AuthSource: SA3PR12MB7901.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Jul 2026 06:53:19.6264 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: NbsRjjEfMrYtv53RM4FSK5iC1Km+efO4q0cd287NiraaVaJBBgodeRVi3DOK3U8aXKB4R1DN/pqeTMTW3oBmEg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB7757 On Sat, Jul 18, 2026 at 07:23:25AM +0900, Yuyang Huang wrote: > When the kernel deletes an IPv6 route on its own, the RTM_DELROUTE > notification does not say why. User space cannot tell a route that > expired from one the router explicitly withdrew, yet the two call for > different reactions: an expired RA route means the router failed to > refresh it in time, which points at a misconfigured or unreliable > router and may warrant action such as disabling IPv6 on that network, > while a zero-lifetime withdrawal is normal, RFC-compliant operation. Please expand more on the motivation: Which user space application is going to consume this information and what is it going to do with it? Also, Sashiko has some valid comments. Please take a look.