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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , David Ahern , Ido Schimmel , Shuah Khan , Petr Machata , Sriram Yagnaraman Subject: [PATCH net v5 1/3] ipv4: ignore dst hint for multipath routes Date: Thu, 31 Aug 2023 10:03:30 +0200 Message-Id: <20230831080332.2495-2-sriram.yagnaraman@est.tech> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230831080332.2495-1-sriram.yagnaraman@est.tech> References: <20230831080332.2495-1-sriram.yagnaraman@est.tech> X-ClientProxiedBy: GVYP280CA0014.SWEP280.PROD.OUTLOOK.COM (2603:10a6:150:fa::8) To DBBP189MB1433.EURP189.PROD.OUTLOOK.COM (2603:10a6:10:1e7::15) 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: DBBP189MB1433:EE_|DB9P189MB1929:EE_ X-MS-Office365-Filtering-Correlation-Id: e9fe18b2-4016-4422-6c83-08dba9f8c875 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DBBP189MB1433.EURP189.PROD.OUTLOOK.COM;PTR:;CAT:NONE;SFS:(13230031)(346002)(136003)(39840400004)(376002)(396003)(109986022)(1800799009)(451199024)(186009)(36756003)(7416002)(83380400001)(8676002)(86362001)(44832011)(41300700001)(8936002)(4326008)(5660300002)(6666004)(1076003)(26005)(2616005)(6486002)(6506007)(6512007)(478600001)(2906002)(38100700002)(54906003)(66556008)(66476007)(70586007)(66946007)(316002)(266003)(37730700002);DIR:OUT;SFP:1102; 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So, do not extract route hint for packets whose destination is part of a multipath group. A new SKB flag IPSKB_MULTIPATH is introduced for this purpose, set the flag when route is looked up in ip_mkroute_input() and use it in ip_extract_route_hint() to check for the existence of the flag. Fixes: 02b24941619f ("ipv4: use dst hint for ipv4 list receive") Signed-off-by: Sriram Yagnaraman Reviewed-by: Ido Schimmel Reviewed-by: David Ahern --- include/net/ip.h | 1 + net/ipv4/ip_input.c | 3 ++- net/ipv4/route.c | 1 + 3 files changed, 4 insertions(+), 1 deletion(-) diff --git a/include/net/ip.h b/include/net/ip.h index 19adacd5ece0..464176a88f86 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -57,6 +57,7 @@ struct inet_skb_parm { #define IPSKB_FRAG_PMTU BIT(6) #define IPSKB_L3SLAVE BIT(7) #define IPSKB_NOPOLICY BIT(8) +#define IPSKB_MULTIPATH BIT(9) u16 frag_max_size; }; diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c index fe9ead9ee863..5e9c8156656a 100644 --- a/net/ipv4/ip_input.c +++ b/net/ipv4/ip_input.c @@ -584,7 +584,8 @@ static void ip_sublist_rcv_finish(struct list_head *head) static struct sk_buff *ip_extract_route_hint(const struct net *net, struct sk_buff *skb, int rt_type) { - if (fib4_has_custom_rules(net) || rt_type == RTN_BROADCAST) + if (fib4_has_custom_rules(net) || rt_type == RTN_BROADCAST || + IPCB(skb)->flags & IPSKB_MULTIPATH) return NULL; return skb; diff --git a/net/ipv4/route.c b/net/ipv4/route.c index a4e153dd615b..6a3f57a3fa41 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -2144,6 +2144,7 @@ static int ip_mkroute_input(struct sk_buff *skb, int h = fib_multipath_hash(res->fi->fib_net, NULL, skb, hkeys); fib_select_multipath(res, h); + IPCB(skb)->flags |= IPSKB_MULTIPATH; } #endif