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.
Showing the changes to include/uapi/linux (1 of 3 files). Show all
Unified · Split
| @@ -266,10 +266,14 @@ struct sockaddr_in { · 265 unmodified lines | ||
| 266 | 266 | |
| 267 | 267 | #define IN_CLASSD(a) ((((long int) (a)) & 0xf0000000) == 0xe0000000) |
| 268 | 268 | #define IN_MULTICAST(a) IN_CLASSD(a) |
| 269 | −#define IN_MULTICAST_NET 0xF0000000 | |
| 269 | +#define IN_MULTICAST_NET 0xe0000000 | |
| 270 | 270 | |
| 271 | −#define IN_EXPERIMENTAL(a) ((((long int) (a)) & 0xf0000000) == 0xf0000000) | |
| 272 | −#define IN_BADCLASS(a) IN_EXPERIMENTAL((a)) | |
| 271 | +#define IN_BADCLASS(a) ((((long int) (a) ) == 0xffffffff) | |
| 272 | +#define IN_EXPERIMENTAL(a) IN_BADCLASS((a)) | |
| 273 | + | |
| 274 | +#define IN_CLASSE(a) ((((long int) (a)) & 0xf0000000) == 0xf0000000) | |
| 275 | +#define IN_CLASSE_NET 0xffffffff | |
| 276 | +#define IN_CLASSE_NSHIFT 0 | |
| 273 | 277 | |
| 274 | 278 | /* Address to accept any incoming messages. */ |
| 275 | 279 | #define INADDR_ANY ((unsigned long int) 0x00000000) |