From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 C620684A2F for ; Mon, 29 Jul 2024 07:50:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722239410; cv=none; b=Pxu5MjZaKH33PMvXda5dX4g3p4YFF5m9262aPiiMzcZ0iwVG8FUNgeqiyon2uR7ZPM0s330emsb9eYOU8U8RnLFYE8JDZqTS5EQvWbU9rC8xM8tuGHG1LE41eyzt0pX1GRvEiKhtPJYgV+xraFqYRFnY+dnUVMnTNbx/rvGHq/M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722239410; c=relaxed/simple; bh=rrJ9UgKXgAjSyROPgnti1efRk1nLDZ3w68KoyNdf4pw=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=H5XHHXIz9SbkmsnItDb7RTGpvbzzgqYCIzQJqoR0Z1xF4XZNPraXMplu0CN6AqphWeScFwRAdFqJeW5rTEfjv/doYcba4PNAQzRKv3Eoevo767sdvN2MWLyFCeykxmfCT3+yYu+/0GmWZoaRlKM6SCIWo+gdiMMgbjo9nLgSY8c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=LtgPhvfU; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="LtgPhvfU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DFF92C32786; Mon, 29 Jul 2024 07:50:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1722239410; bh=rrJ9UgKXgAjSyROPgnti1efRk1nLDZ3w68KoyNdf4pw=; h=Subject:To:Cc:From:Date:From; b=LtgPhvfU4ygYZBE0A/FUG46rLwGJvVqJ5K5sfryJJNo3Lm/z/KSzQL4iYSp6VeFSH 3su/PN+BrXD///Yoc+5ysFeecipfkvEr05DwgmRv9IeAUip9DkYQwDgyZhpz0Css0D lYMhowVBS4XE9TKgiK/MTrHh+mFwSlXblaYv0cdc= Subject: FAILED: patch "[PATCH] ipv6: fix source address selection with route leak" failed to apply to 6.6-stable tree To: nicolas.dichtel@6wind.com,kuba@kernel.org Cc: From: Date: Mon, 29 Jul 2024 09:50:07 +0200 Message-ID: <2024072906-causation-conceal-2567@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x 252442f2ae317d109ef0b4b39ce0608c09563042 # git commit -s git send-email --to '' --in-reply-to '2024072906-causation-conceal-2567@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^.. Possible dependencies: 252442f2ae31 ("ipv6: fix source address selection with route leak") fa17a6d8a5bd ("ipv6: lockless IPV6_ADDR_PREFERENCES implementation") 859f8b265fc2 ("ipv6: lockless IPV6_FLOWINFO_SEND implementation") 6b724bc4300b ("ipv6: lockless IPV6_MTU_DISCOVER implementation") 83cd5eb654b3 ("ipv6: lockless IPV6_ROUTER_ALERT_ISOLATE implementation") 3cccda8db2cf ("ipv6: move np->repflow to atomic flags") 3fa29971c695 ("ipv6: lockless IPV6_RECVERR implemetation") 1086ca7cce29 ("ipv6: lockless IPV6_DONTFRAG implementation") 5121516b0c47 ("ipv6: lockless IPV6_AUTOFLOWLABEL implementation") 6559c0ff3bc2 ("ipv6: lockless IPV6_MULTICAST_ALL implementation") dcae74622c05 ("ipv6: lockless IPV6_RECVERR_RFC4884 implementation") 273784d3c574 ("ipv6: lockless IPV6_MINHOPCOUNT implementation") 15f926c4457a ("ipv6: lockless IPV6_MTU implementation") 2da23eb07c91 ("ipv6: lockless IPV6_MULTICAST_HOPS implementation") d986f52124e0 ("ipv6: lockless IPV6_MULTICAST_LOOP implementation") b0adfba7ee77 ("ipv6: lockless IPV6_UNICAST_HOPS implementation") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 252442f2ae317d109ef0b4b39ce0608c09563042 Mon Sep 17 00:00:00 2001 From: Nicolas Dichtel Date: Wed, 10 Jul 2024 10:14:28 +0200 Subject: [PATCH] ipv6: fix source address selection with route leak By default, an address assigned to the output interface is selected when the source address is not specified. This is problematic when a route, configured in a vrf, uses an interface from another vrf (aka route leak). The original vrf does not own the selected source address. Let's add a check against the output interface and call the appropriate function to select the source address. CC: stable@vger.kernel.org Fixes: 0d240e7811c4 ("net: vrf: Implement get_saddr for IPv6") Signed-off-by: Nicolas Dichtel Link: https://patch.msgid.link/20240710081521.3809742-3-nicolas.dichtel@6wind.com Signed-off-by: Jakub Kicinski diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h index a18ed24fed94..6dbdf60b342f 100644 --- a/include/net/ip6_route.h +++ b/include/net/ip6_route.h @@ -127,18 +127,26 @@ void rt6_age_exceptions(struct fib6_info *f6i, struct fib6_gc_args *gc_args, static inline int ip6_route_get_saddr(struct net *net, struct fib6_info *f6i, const struct in6_addr *daddr, - unsigned int prefs, + unsigned int prefs, int l3mdev_index, struct in6_addr *saddr) { + struct net_device *l3mdev; + struct net_device *dev; + bool same_vrf; int err = 0; - if (f6i && f6i->fib6_prefsrc.plen) { - *saddr = f6i->fib6_prefsrc.addr; - } else { - struct net_device *dev = f6i ? fib6_info_nh_dev(f6i) : NULL; + rcu_read_lock(); - err = ipv6_dev_get_saddr(net, dev, daddr, prefs, saddr); - } + l3mdev = dev_get_by_index_rcu(net, l3mdev_index); + if (!f6i || !f6i->fib6_prefsrc.plen || l3mdev) + dev = f6i ? fib6_info_nh_dev(f6i) : NULL; + same_vrf = !l3mdev || l3mdev_master_dev_rcu(dev) == l3mdev; + if (f6i && f6i->fib6_prefsrc.plen && same_vrf) + *saddr = f6i->fib6_prefsrc.addr; + else + err = ipv6_dev_get_saddr(net, same_vrf ? dev : l3mdev, daddr, prefs, saddr); + + rcu_read_unlock(); return err; } diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 27d8725445e3..784424ac4147 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -1124,6 +1124,7 @@ static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk, from = rt ? rcu_dereference(rt->from) : NULL; err = ip6_route_get_saddr(net, from, &fl6->daddr, sk ? READ_ONCE(inet6_sk(sk)->srcprefs) : 0, + fl6->flowi6_l3mdev, &fl6->saddr); rcu_read_unlock(); diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 8d72ca0b086d..c9a9506b714d 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -5689,7 +5689,7 @@ static int rt6_fill_node(struct net *net, struct sk_buff *skb, goto nla_put_failure; } else if (dest) { struct in6_addr saddr_buf; - if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 && + if (ip6_route_get_saddr(net, rt, dest, 0, 0, &saddr_buf) == 0 && nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) goto nla_put_failure; }