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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , David Ahern , Ido Schimmel , Shuah Khan , Petr Machata , Sriram Yagnaraman Subject: [PATCH net v3 2/3] ipv6: ignore dst hint for multipath routes Date: Mon, 28 Aug 2023 13:32:20 +0200 Message-Id: <20230828113221.20123-3-sriram.yagnaraman@est.tech> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230828113221.20123-1-sriram.yagnaraman@est.tech> References: <20230828113221.20123-1-sriram.yagnaraman@est.tech> X-ClientProxiedBy: GV3P280CA0015.SWEP280.PROD.OUTLOOK.COM (2603:10a6:150:b::13) 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_|AM0P189MB0817:EE_ X-MS-Office365-Filtering-Correlation-Id: 54189382-a968-4e20-6769-08dba7c24a6b 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)(396003)(39830400003)(376002)(136003)(1800799009)(451199024)(186009)(109986022)(1076003)(44832011)(83380400001)(6512007)(478600001)(26005)(7416002)(2616005)(5660300002)(2906002)(8676002)(8936002)(4326008)(70586007)(6486002)(38100700002)(66946007)(66476007)(86362001)(66556008)(54906003)(41300700001)(36756003)(316002)(6666004)(6506007)(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 839247a4f48e..fe3492a67b35 100644 --- a/include/linux/ipv6.h +++ b/include/linux/ipv6.h @@ -146,6 +146,7 @@ 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 56a55585eb79..a02328c93a53 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -424,6 +424,9 @@ 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. */