netdev - [PATCH] net: allow traceroute with a specified interface in a vrf

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Date:   Fri, 26 Oct 2018 12:24:35 +0100
From:   Mike Manning <mmanning@...tta.att-mail.com>
To:     netdev@...r.kernel.org
Subject: [PATCH] net: allow traceroute with a specified interface in a vrf

Traceroute executed in a vrf succeeds if no device is given or if the
vrf is given as the device, but fails if the interface is given as the
device. This is for default UDP probes, it succeeds for TCP SYN or ICMP
ECHO probes. As the skb bound dev is the interface and the sk dev is
the vrf, sk lookup fails for ICMP_DEST_UNREACH and ICMP_TIME_EXCEEDED
messages. The solution is for the secondary dev to be passed so that
the interface is available for the device match to succeed, in the same
way as is already done for non-error cases.

Signed-off-by: Mike Manning <mmanning@...tta.att-mail.com>
---
 net/ipv4/udp.c | 4 ++--
 net/ipv6/udp.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 1f5e78d1477d..c9bc08915153 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -676,8 +676,8 @@ void __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable)
 	struct net *net = dev_net(skb->dev);
 
 	sk = __udp4_lib_lookup(net, iph->daddr, uh->dest,
-			       iph->saddr, uh->source, skb->dev->ifindex, 0,
-			       udptable, NULL);
+			       iph->saddr, uh->source, skb->dev->ifindex,
+			       inet_sdif(skb), udptable, NULL);
 	if (!sk) {
 		__ICMP_INC_STATS(net, ICMP_MIB_INERRORS);
 		return;	/* No socket for error */
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 4f0a8728d723..740be1fbd4f5 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -543,7 +543,7 @@ void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 	struct net *net = dev_net(skb->dev);
 
 	sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
-			       inet6_iif(skb), 0, udptable, skb);
+			       inet6_iif(skb), inet6_sdif(skb), udptable, skb);
 	if (!sk) {
 		__ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
 				  ICMP6_MIB_INERRORS);
-- 
2.11.0