From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1BE4B4F7CBF; Wed, 30 Sep 2026 17:11:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790788270; cv=none; b=kr4rUe/6ERcf4iQiqgtMHhzHaRwG49q+b/tqjD4rHvoSkfTHepDUGK/ht31NGfBMwHLQWrYnjt1O/bhxQ5dI4bPG0RGupzImHbILRY9B98SD4TC0OKE/GQDxCSzwJl+uoDEdjRDva+x7tLI7BTnyvWSnNYb1S7nHEIg9QWShFF8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790788270; c=relaxed/simple; bh=isieRp5cK6yHRr5rQbcNLrfOPeLrFw17HSDxOKHM2oU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nmKOCUmpmH72nYaoNd7UPlrV6FZDjYnV0E1SKVaSRkaAb1siRrw9SWhzmiXNnrkU+2rOPENNNuXlvtLbB9dwNAmSfryZbE9rhYKpPc9z47sgllwCVa1icQRqi6hncO5rakIp+gIGp1zzoCQfSmhcqEC0m659Ge7KC7DzZ+xRCAE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=xYJ00Oji; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="xYJ00Oji" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 753991F000FF; Wed, 30 Sep 2026 17:11:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790788269; bh=LQ20Tney2yqMcGwEEXbP/5jgVjNfACcaihoVpoKcOwU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=xYJ00Oji4XXzOPZTNCDiupZobEioE+NZwj7baJpKgpXkRQ3EBLOHpzxdHEkM54sNa tmGPXGBB5BLDzNCS8UxEI8dAXVROVKnTWNoLbTJ63wbuGtjfdy51+/wl8/sfGcbH8F gjYSTFB5wy0aBzBcEhXnEi4ptmHIF3gM09h2/g8M= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ido Schimmel , David Ahern , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.12 020/877] ipv6: Select best matching nexthop object in fib6_table_lookup() Date: Wed, 30 Sep 2026 17:15:31 +0200 Message-ID: <20260930152415.182270219@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152414.738996857@linuxfoundation.org> References: <20260930152414.738996857@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ido Schimmel [ Upstream commit 484bb9d164df397a53e0f533b262b27b1590efcb ] Currently, when using multipath routes without nexthop objects, fib6_table_lookup() selects the nexthop with the highest score. This means that when both a source address and an oif are specified, the nexthop that is chosen is the one that matches in terms of oif: # sysctl -wq net.ipv6.conf.all.forwarding=1 # ip address add 2001:db8:2::1/64 dev lo # ip route add 2001:db8:10::/64 nexthop via fe80::1 dev dummy1 nexthop via fe80::2 dev dummy2 # perf record -e fib6:fib6_table_lookup -- bash -c "for i in {1..100}; do ip route get 2001:db8:10::${i} from 2001:db8:2::1 oif dummy1; done > /dev/null" # perf script | grep -o dummy[0-9] | sort | uniq -c 100 dummy1 # perf record -e fib6:fib6_table_lookup -- bash -c "for i in {1..100}; do ip route get 2001:db8:10::${i} from 2001:db8:2::1 oif dummy2; done > /dev/null" # perf script | grep -o dummy[0-9] | sort | uniq -c 100 dummy2 When using nexthop objects, fib6_table_lookup() selects the first matching nexthop and not necessarily the one with the highest score: # ip nexthop add id 1 via fe80::1 dev dummy1 # ip nexthop add id 2 via fe80::2 dev dummy2 # ip nexthop add id 3 group 1/2 # ip route add 2001:db8:20::/64 nhid 3 # perf record -e fib6:fib6_table_lookup -- bash -c "for i in {1..100}; do ip route get 2001:db8:20::${i} from 2001:db8:2::1 oif dummy1; done > /dev/null" # perf script | grep -o dummy[0-9] | sort | uniq -c 100 dummy1 # perf record -e fib6:fib6_table_lookup -- bash -c "for i in {1..100}; do ip route get 2001:db8:20::${i} from 2001:db8:2::1 oif dummy2; done > /dev/null" # perf script | grep -o dummy[0-9] | sort | uniq -c 100 dummy1 This is not very significant right now because the nexthop is later overwritten during path selection in fib6_select_path(). However, the next patch is going to skip path selection when we have an oif match during output route lookup. As a preparation for this change, align the nexthop object behavior with the legacy one and make sure that fib6_table_lookup() always selects the best matching nexthop. Do that by always returning 0 from rt6_nh_find_match() in order not to terminate the loop in nexthop_for_each_fib6_nh() and storing in arg->nh the best matching nexthop so far. Behavior after the change: # perf record -e fib6:fib6_table_lookup -- bash -c "for i in {1..100}; do ip route get 2001:db8:20::${i} from 2001:db8:2::1 oif dummy1; done > /dev/null" # perf script | grep -o dummy[0-9] | sort | uniq -c 100 dummy1 # perf record -e fib6:fib6_table_lookup -- bash -c "for i in {1..100}; do ip route get 2001:db8:20::${i} from 2001:db8:2::1 oif dummy2; done > /dev/null" # perf script | grep -o dummy[0-9] | sort | uniq -c 100 dummy2 Signed-off-by: Ido Schimmel Reviewed-by: David Ahern Link: https://patch.msgid.link/20260611154605.992528-2-idosch@nvidia.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/ipv6/route.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 19c970978e863..b30cb180009b1 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -820,9 +820,11 @@ static int rt6_nh_find_match(struct fib6_nh *nh, void *_arg) { struct fib6_nh_frl_arg *arg = _arg; - arg->nh = nh; - return find_match(nh, arg->flags, arg->oif, arg->strict, - arg->mpri, arg->do_rr); + if (find_match(nh, arg->flags, arg->oif, arg->strict, arg->mpri, + arg->do_rr)) + arg->nh = nh; + + return 0; } static void __find_rr_leaf(struct fib6_info *f6i_start, @@ -862,11 +864,10 @@ static void __find_rr_leaf(struct fib6_info *f6i_start, res->nh = nexthop_fib6_nh(f6i->nh); return; } - if (nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_find_match, - &arg)) { - matched = true; - nh = arg.nh; - } + nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_find_match, + &arg); + matched = !!arg.nh; + nh = arg.nh; } else { nh = f6i->fib6_nh; if (find_match(nh, f6i->fib6_flags, oif, strict, -- 2.53.0