From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Guillaume Nault <gnault@redhat.com>,
David Ahern <dsahern@kernel.org>,
Jakub Kicinski <kuba@kernel.org>
Subject: [PATCH 5.4 16/39] ipv4: Fix tos mask in inet_rtm_getroute()
Date: Sun, 6 Dec 2020 12:17:20 +0100 [thread overview]
Message-ID: <20201206111555.458123604@linuxfoundation.org> (raw)
In-Reply-To: <20201206111554.677764505@linuxfoundation.org>
From: Guillaume Nault <gnault@redhat.com>
[ Upstream commit 1ebf179037cb46c19da3a9c1e2ca16e7a754b75e ]
When inet_rtm_getroute() was converted to use the RCU variants of
ip_route_input() and ip_route_output_key(), the TOS parameters
stopped being masked with IPTOS_RT_MASK before doing the route lookup.
As a result, "ip route get" can return a different route than what
would be used when sending real packets.
For example:
$ ip route add 192.0.2.11/32 dev eth0
$ ip route add unreachable 192.0.2.11/32 tos 2
$ ip route get 192.0.2.11 tos 2
RTNETLINK answers: No route to host
But, packets with TOS 2 (ECT(0) if interpreted as an ECN bit) would
actually be routed using the first route:
$ ping -c 1 -Q 2 192.0.2.11
PING 192.0.2.11 (192.0.2.11) 56(84) bytes of data.
64 bytes from 192.0.2.11: icmp_seq=1 ttl=64 time=0.173 ms
--- 192.0.2.11 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.173/0.173/0.173/0.000 ms
This patch re-applies IPTOS_RT_MASK in inet_rtm_getroute(), to
return results consistent with real route lookups.
Fixes: 3765d35ed8b9 ("net: ipv4: Convert inet_rtm_getroute to rcu versions of route lookup")
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/b2d237d08317ca55926add9654a48409ac1b8f5b.1606412894.git.gnault@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/ipv4/route.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -3132,7 +3132,7 @@ static int inet_rtm_getroute(struct sk_b
fl4.daddr = dst;
fl4.saddr = src;
- fl4.flowi4_tos = rtm->rtm_tos;
+ fl4.flowi4_tos = rtm->rtm_tos & IPTOS_RT_MASK;
fl4.flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0;
fl4.flowi4_mark = mark;
fl4.flowi4_uid = uid;
@@ -3156,8 +3156,9 @@ static int inet_rtm_getroute(struct sk_b
fl4.flowi4_iif = iif; /* for rt_fill_info */
skb->dev = dev;
skb->mark = mark;
- err = ip_route_input_rcu(skb, dst, src, rtm->rtm_tos,
- dev, &res);
+ err = ip_route_input_rcu(skb, dst, src,
+ rtm->rtm_tos & IPTOS_RT_MASK, dev,
+ &res);
rt = skb_rtable(skb);
if (err == 0 && rt->dst.error)
next prev parent reply other threads:[~2020-12-06 11:42 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-06 11:17 [PATCH 5.4 00/39] 5.4.82-rc1 review Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 01/39] devlink: Hold rtnl lock while reading netdev attributes Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 02/39] ipv6: addrlabel: fix possible memory leak in ip6addrlbl_net_init Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 03/39] net/af_iucv: set correct sk_protocol for child sockets Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 04/39] net/tls: missing received data after fast remote close Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 05/39] net/tls: Protect from calling tls_dev_del for TLS RX twice Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 06/39] rose: Fix Null pointer dereference in rose_send_frame() Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 07/39] sock: set sk_err to ee_errno on dequeue from errq Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 08/39] tcp: Set INET_ECN_xmit configuration in tcp_reinit_congestion_control Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 09/39] tun: honor IOCB_NOWAIT flag Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 10/39] usbnet: ipheth: fix connectivity with iOS 14 Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 11/39] bonding: wait for sysfs kobject destruction before freeing struct slave Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 12/39] staging/octeon: fix up merge error Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 13/39] ima: extend boot_aggregate with kernel measurements Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 14/39] sched/fair: Fix unthrottle_cfs_rq() for leaf_cfs_rq list Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 15/39] netfilter: bridge: reset skb->pkt_type after NF_INET_POST_ROUTING traversal Greg Kroah-Hartman
2020-12-06 11:17 ` Greg Kroah-Hartman [this message]
2020-12-06 11:17 ` [PATCH 5.4 17/39] dt-bindings: net: correct interrupt flags in examples Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 18/39] chelsio/chtls: fix panic during unload reload chtls Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 19/39] ibmvnic: Ensure that SCRQ entry reads are correctly ordered Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 20/39] ibmvnic: Fix TX completion error handling Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 21/39] inet_ecn: Fix endianness of checksum update when setting ECT(1) Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 22/39] geneve: pull IP header before ECN decapsulation Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 23/39] net: ip6_gre: set dev->hard_header_len when using header_ops Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 24/39] net/x25: prevent a couple of overflows Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 25/39] cxgb3: fix error return code in t3_sge_alloc_qset() Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 26/39] net: pasemi: fix error return code in pasemi_mac_open() Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 27/39] vxlan: fix error return code in __vxlan_dev_create() Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 28/39] chelsio/chtls: fix a double free in chtls_setkey() Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 29/39] net: mvpp2: Fix error return code in mvpp2_open() Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 30/39] net: skbuff: ensure LSE is pullable before decrementing the MPLS ttl Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 31/39] net: openvswitch: ensure LSE is pullable before reading it Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 32/39] net/sched: act_mpls: " Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 33/39] net/mlx5: DR, Proper handling of unsupported Connect-X6DX SW steering Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 34/39] net/mlx5: Fix wrong address reclaim when command interface is down Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 35/39] ALSA: usb-audio: US16x08: fix value count for level meters Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 36/39] Input: xpad - support Ardwiino Controllers Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 37/39] Input: i8042 - add ByteSpeed touchpad to noloop table Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 38/39] tracing: Remove WARN_ON in start_thread() Greg Kroah-Hartman
2020-12-06 11:17 ` [PATCH 5.4 39/39] RDMA/i40iw: Address an mmap handler exploit in i40iw Greg Kroah-Hartman
2020-12-07 8:03 ` [PATCH 5.4 00/39] 5.4.82-rc1 review Naresh Kamboju
2020-12-07 15:55 ` Guenter Roeck
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