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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , David Ahern , Ido Schimmel , Shuah Khan , Petr Machata , Sriram Yagnaraman Subject: [PATCH net v4 2/3] ipv6: ignore dst hint for multipath routes Date: Wed, 30 Aug 2023 11:13:40 +0200 Message-Id: <20230830091341.17273-3-sriram.yagnaraman@est.tech> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230830091341.17273-1-sriram.yagnaraman@est.tech> References: <20230830091341.17273-1-sriram.yagnaraman@est.tech> X-ClientProxiedBy: GVX0EPF000013E4.SWEP280.PROD.OUTLOOK.COM (2603:10a6:144:1::24) 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_|AS8P189MB2096:EE_ X-MS-Office365-Filtering-Correlation-Id: d62f3f34-7ed5-4b72-e114-08dba9397107 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)(376002)(396003)(39840400004)(1800799009)(109986022)(186009)(451199024)(8936002)(6666004)(478600001)(70586007)(66556008)(6506007)(66946007)(66476007)(54906003)(6486002)(316002)(38100700002)(41300700001)(6512007)(26005)(44832011)(5660300002)(8676002)(36756003)(1076003)(83380400001)(2906002)(2616005)(86362001)(7416002)(4326008)(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 IP6SKB_MULTIPATH is introduced for this purpose, set the flag when route is looked up in fib6_select_path() and use it in ip6_can_use_hint() to check for the existence of the flag. Fixes: 197dbf24e360 ("ipv6: introduce and uses route look hints for list input.") Signed-off-by: Sriram Yagnaraman Reviewed-by: Ido Schimmel Reviewed-by: David Ahern --- include/linux/ipv6.h | 1 + net/ipv6/ip6_input.c | 3 ++- net/ipv6/route.c | 3 +++ 3 files changed, 6 insertions(+), 1 deletion(-) diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h index 5883551b1ee8..af8a771a053c 100644 --- a/include/linux/ipv6.h +++ b/include/linux/ipv6.h @@ -147,6 +147,7 @@ struct inet6_skb_parm { #define IP6SKB_JUMBOGRAM 128 #define IP6SKB_SEG6 256 #define IP6SKB_FAKEJUMBO 512 +#define IP6SKB_MULTIPATH 1024 }; #if defined(CONFIG_NET_L3_MASTER_DEV) diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c index d94041bb4287..b8378814532c 100644 --- a/net/ipv6/ip6_input.c +++ b/net/ipv6/ip6_input.c @@ -99,7 +99,8 @@ static bool ip6_can_use_hint(const struct sk_buff *skb, static struct sk_buff *ip6_extract_route_hint(const struct net *net, struct sk_buff *skb) { - if (fib6_routes_require_src(net) || fib6_has_custom_rules(net)) + if (fib6_routes_require_src(net) || fib6_has_custom_rules(net) || + IP6CB(skb)->flags & IP6SKB_MULTIPATH) return NULL; return skb; diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 846aec8e0093..01d6d352850a 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -423,6 +423,9 @@ void fib6_select_path(const struct net *net, struct fib6_result *res, if (match->nh && have_oif_match && res->nh) return; + if (skb) + IP6CB(skb)->flags |= IP6SKB_MULTIPATH; + /* We might have already computed the hash for ICMPv6 errors. In such * case it will always be non-zero. Otherwise now is the time to do it. */