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authorDave Taht <dave.taht@gmail.com>2018-12-11 15:30:34 -0800
committerDavid S. Miller <davem@davemloft.net>2018-12-14 15:39:31 -0800
commit65cab850f0eeaa9180bd2e10a231964f33743edf (patch)
tree4961b7fab35dd56eed20a01ee338e3cfd1bed7a4 /net/ipv4/devinet.c
parentip6mr: Fix potential Spectre v1 vulnerability (diff)
downloadlinux-dev-65cab850f0eeaa9180bd2e10a231964f33743edf.tar.xz
linux-dev-65cab850f0eeaa9180bd2e10a231964f33743edf.zip
net: Allow class-e address assignment via ifconfig ioctl
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>
Diffstat (limited to 'net/ipv4/devinet.c')
-rw-r--r--net/ipv4/devinet.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index a34602ae27de..608a6f4223fb 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -952,17 +952,18 @@ 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;