netdev - [PATCH iproute2-next] ipaddress: fix label matching

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Date:   Wed, 11 Jul 2018 13:36:03 +0200
From:   Vincent Bernat <vincent@...nat.im>
To:     netdev@...r.kernel.org, stephen@...workplumber.org,
        serhe.popovych@...il.com
Cc:     Vincent Bernat <vincent@...nat.im>
Subject: [PATCH iproute2-next] ipaddress: fix label matching

Since 9516823051ce, "ip addr show label lo:1" doesn't work
anymore (doesn't show any address, despite a matching label).
Reverting to return 0 instead of -1 fix the issue.

However, the condition says: "if we filter by label [...] and the
label does NOT match the interface name". This makes little sense to
compare the label with the interface name. There is also a logic
around filter family being provided or not. The match against the
label is done by ifa_label_match_rta() in print_addrinfo() and
ipaddr_filter().

Just removing the condition makes "ip addr show" works as expected
with or without specifying a label, both when the label is matching
and not matching. It also works if we specify a label and the label is
the interface name. The flush operation also works as expected.

Fixes: 9516823051ce ("ipaddress: Improve print_linkinfo()")
Signed-off-by: Vincent Bernat <vincent@...nat.im>
---
 ip/ipaddress.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index 5009bfe6d2e3..20ef6724944e 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -837,11 +837,6 @@ int print_linkinfo(const struct sockaddr_nl *who,
 	if (!name)
 		return -1;

-	if (filter.label &&
-	    (!filter.family || filter.family == AF_PACKET) &&
-	    fnmatch(filter.label, name, 0))
-		return -1;
-
 	if (tb[IFLA_GROUP]) {
 		int group = rta_getattr_u32(tb[IFLA_GROUP]);

-- 
2.18.0