New subject: [OpenWrt-Devel] [PATCH] net: Allow class-e address assignment via ifconfig ioctl

14 Feb 2019

From: Dave Taht dave.taht@gmail.com
commit 65cab850f0eeaa9180bd2e10a231964f33743edf upstream.
While most distributions long ago switched to the iproute2 suite
of utilities, which allow class-e (240.0.0.0/4) address assignment,
distributions relying on busybox, toybox and other forms of
ifconfig cannot assign class-e addresses without this kernel patch.
While CIDR has been obsolete for 2 decades, and a survey of all the
open source code in the world shows the IN_whatever macros are also
obsolete... rather than obsolete CIDR from this ioctl entirely, this
patch merely enables class-e assignment, sanely.
Signed-off-by: Dave Taht dave.taht@gmail.com
Signed-off-by: David S. Miller davem@davemloft.net
---
- This commit is upstream in v4.20
- This should ve applied for stable v4.19.y, v4.14.y and v4.9.y
---
 include/uapi/linux/in.h | 10 +++++++---
 net/ipv4/devinet.c      |  5 +++--
 net/ipv4/ipconfig.c     |  2 ++
 3 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/include/uapi/linux/in.h b/include/uapi/linux/in.h
index 48e8a225b985..f6052e70bf40 100644
--- a/include/uapi/linux/in.h
+++ b/include/uapi/linux/in.h
@@ -266,10 +266,14 @@ struct sockaddr_in {
#define	IN_CLASSD(a)		((((long int) (a)) & 0xf0000000) == 0xe0000000)
 #define	IN_MULTICAST(a)		IN_CLASSD(a)
-#define IN_MULTICAST_NET	0xF0000000
+#define	IN_MULTICAST_NET	0xe0000000
-#define	IN_EXPERIMENTAL(a)	((((long int) (a)) & 0xf0000000) == 0xf0000000)
-#define	IN_BADCLASS(a)		IN_EXPERIMENTAL((a))
+#define	IN_BADCLASS(a)		((((long int) (a) ) == 0xffffffff)
+#define	IN_EXPERIMENTAL(a)	IN_BADCLASS((a))
+
+#define	IN_CLASSE(a)		((((long int) (a)) & 0xf0000000) == 0xf0000000)
+#define	IN_CLASSE_NET		0xffffffff
+#define	IN_CLASSE_NSHIFT	0
/* Address to accept any incoming messages. */
 #define	INADDR_ANY		((unsigned long int) 0x00000000)
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index ea4bd8a52422..e38042933a27 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -941,17 +941,18 @@ static int inet_abc_len(__be32 addr)
 {
    int rc = -1;	/* Something else, probably a multicast. */
-	if (ipv4_is_zeronet(addr))
+	if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
    	rc = 0;
    else {
    	__u32 haddr = ntohl(addr);
-
    	if (IN_CLASSA(haddr))
    		rc = 8;
    	else if (IN_CLASSB(haddr))
    		rc = 16;
    	else if (IN_CLASSC(haddr))
    		rc = 24;
+		else if (IN_CLASSE(haddr))
+			rc = 32;
    }
return rc;
diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index 88212615bf4c..2393e5c106bf 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -429,6 +429,8 @@ static int __init ic_defaults(void)
    		ic_netmask = htonl(IN_CLASSB_NET);
    	else if (IN_CLASSC(ntohl(ic_myaddr)))
    		ic_netmask = htonl(IN_CLASSC_NET);
+		else if (IN_CLASSE(ntohl(ic_myaddr)))
+			ic_netmask = htonl(IN_CLASSE_NET);
    	else {
    		pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
    		       &ic_myaddr);
-- 
2.20.1


    