diff options
Diffstat (limited to 'target/linux/generic/backport-4.14/095-Allow-class-e-address-assignment-via-ifconfig-ioctl.patch')
| -rw-r--r-- | target/linux/generic/backport-4.14/095-Allow-class-e-address-assignment-via-ifconfig-ioctl.patch | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/target/linux/generic/backport-4.14/095-Allow-class-e-address-assignment-via-ifconfig-ioctl.patch b/target/linux/generic/backport-4.14/095-Allow-class-e-address-assignment-via-ifconfig-ioctl.patch new file mode 100644 index 0000000000..fec083dadb --- /dev/null +++ b/target/linux/generic/backport-4.14/095-Allow-class-e-address-assignment-via-ifconfig-ioctl.patch @@ -0,0 +1,79 @@ +From 46bf067870156abd61fe24d14c2486d15b8b502c Mon Sep 17 00:00:00 2001 +From: Dave Taht <dave@taht.net> +Date: Fri, 14 Dec 2018 18:38:40 +0000 +Subject: [PATCH 1/1] Allow class-e address assignment in ifconfig and early + boot + +While the linux kernel became mostly "class-e clean" a decade ago, +and 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. + +With this patch, also, a boot command line on these addresses is feasible: +(ip=248.0.1.2::248.0.1.1:255.255.255.0). + +While CIDR has been obsolete for 2 decades, and a survey of all the +userspace open source code in the world shows most IN_whatever macros +are also obsolete... rather than obsolete CIDR from this ioctl entirely, +this patch merely enables class-e assignment, sanely. + +H/T to Vince Fuller and his original patch here: + https://lkml.org/lkml/2008/1/7/370 + +Signed-off-by: Dave Taht <dave.taht@gmail.com> +Reviewed-by: John Gilmore <gnu@toad.com> +--- + include/uapi/linux/in.h | 8 ++++++-- + net/ipv4/devinet.c | 4 +++- + net/ipv4/ipconfig.c | 2 ++ + 3 files changed, 11 insertions(+), 3 deletions(-) + +--- a/include/uapi/linux/in.h ++++ b/include/uapi/linux/in.h +@@ -268,8 +268,12 @@ struct sockaddr_in { + #define IN_MULTICAST(a) IN_CLASSD(a) + #define IN_MULTICAST_NET 0xF0000000 + +-#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) +--- a/net/ipv4/devinet.c ++++ b/net/ipv4/devinet.c +@@ -921,7 +921,7 @@ 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); +@@ -932,6 +932,8 @@ static int inet_abc_len(__be32 addr) + rc = 16; + else if (IN_CLASSC(haddr)) + rc = 24; ++ else if (IN_CLASSE(haddr)) ++ rc = 32; + } + + return rc; +--- a/net/ipv4/ipconfig.c ++++ b/net/ipv4/ipconfig.c +@@ -457,6 +457,8 @@ 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); |