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| author |   Dave Taht <dave.taht@gmail.com> | 2018-12-11 15:30:34 -0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-12-14 15:39:31 -0800 |
| commit | 65cab850f0eeaa9180bd2e10a231964f33743edf (patch) | |
| tree | 4961b7fab35dd56eed20a01ee338e3cfd1bed7a4 /net/ipv4/devinet.c | |
| parent | ip6mr: Fix potential Spectre v1 vulnerability (diff) | |
| download | linux-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 '')
| -rw-r--r-- | net/ipv4/devinet.c | 5 |
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; |