netdev - [PATCH v2] ipaddress: remove 'label' compatibility with Linux-2.0 net aliases

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Date:   Mon,  7 Mar 2022 12:40:57 +0100
From:   Maxime de Roucy <maxime.deroucy@...il.com>
To:     netdev@...r.kernel.org
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        Maxime de Roucy <maxime.deroucy@...il.com>
Subject: [PATCH v2] ipaddress: remove 'label' compatibility with Linux-2.0 net aliases

Sorry, I am not familiar with the contribution through mail mecanism and the `git send-email` command.

I tried to resubmit my patch in reply to
https://patchwork.kernel.org/project/netdevbpf/patch/f0215a333fd80102cfab9c560fc2872e8eddb079.camel@gmail.com/#24766590
but I don't see my message appearing in the mailing list archive… so I
tried multiple `git send-email` argument combination. You might have
receive this mail multiple times.

As Linux-2.0 is getting old and systemd allows non Linux-2.0 compatible
aliases to be set, I think iproute2 should be able to manage such
aliases.

Signed-off-by: Maxime de Roucy <maxime.deroucy@...il.com>
---
 ip/ipaddress.c           | 16 ----------------
 man/man8/ip-address.8.in |  3 ---
 2 files changed, 19 deletions(-)

diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index 739b0b9c..a80996ef 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -2349,16 +2349,6 @@ static bool ipaddr_is_multicast(inet_prefix *a)
 		return false;
 }
 
-static bool is_valid_label(const char *dev, const char *label)
-{
-	size_t len = strlen(dev);
-
-	if (strncmp(label, dev, len) != 0)
-		return false;
-
-	return label[len] == '\0' || label[len] == ':';
-}
-
 static int ipaddr_modify(int cmd, int flags, int argc, char **argv)
 {
 	struct {
@@ -2501,12 +2491,6 @@ static int ipaddr_modify(int cmd, int flags, int argc, char **argv)
 		fprintf(stderr, "Not enough information: \"dev\" argument is required.\n");
 		return -1;
 	}
-	if (l && !is_valid_label(d, l)) {
-		fprintf(stderr,
-			"\"label\" (%s) must match \"dev\" (%s) or be prefixed by \"dev\" with a colon.\n",
-			l, d);
-		return -1;
-	}
 
 	if (peer_len == 0 && local_len) {
 		if (cmd == RTM_DELADDR && lcl.family == AF_INET && !(lcl.flags & PREFIXLEN_SPECIFIED)) {
diff --git a/man/man8/ip-address.8.in b/man/man8/ip-address.8.in
index a614ac64..1846252d 100644
--- a/man/man8/ip-address.8.in
+++ b/man/man8/ip-address.8.in
@@ -195,9 +195,6 @@ is derived by setting/resetting the host bits of the interface prefix.
 .TP
 .BI label " LABEL"
 Each address may be tagged with a label string.
-In order to preserve compatibility with Linux-2.0 net aliases,
-this string must coincide with the name of the device or must be prefixed
-with the device name followed by colon.
 The maximum allowed total length of label is 15 characters.
 
 .TP
-- 
2.35.1