[PATCH] Support for the LOWER_UP flag

[Natanael Copa]

Hi,

Attatched is a patch for the LOWER_UP flag in 'ip link/addr' output. 
Useful to check if network cable is inserted or not.

The code does an ugly ifdef to check if IFF_LOWER_UP is declared or not. 
On my zenwalk desktop it was not. It looks like iproute2 maintain their 
own copies of the linux headers so I suppose we cannot expect the flag 
be there. (should mabe be in one of the include files rather than in the 
.c file?)

The patch does increase the size a bit due to a macro. Maybe should have 
a config option for it?

on my hardened uclibc i386 build:

function                                             old     new   delta
ipaddr_list_or_flush                                2929    2981     +52
.rodata                                             7677    7683      +6
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 58/0)               Total: 58 
bytes
  text       data        bss        dec        hex    filename
 47498        670       4244      52412       ccbc    busybox_old
 47556        670       4244      52470       ccf6    busybox_unstripped

-nc
Index: networking/libiproute/ipaddress.c
===================================================================
--- networking/libiproute/ipaddress.c	(revision 22216)
+++ networking/libiproute/ipaddress.c	(working copy)
@@ -18,6 +18,10 @@
 #include "rt_names.h"
 #include "utils.h"
 
+#ifndef IFF_LOWER_UP
+/* from linux/if.h */
+#define IFF_LOWER_UP	0x10000		/* driver signals L1 up*/
+#endif
 
 typedef struct filter_t {
 	char *label;
@@ -63,6 +67,7 @@
 	_PF(NOTRAILERS);
 #endif
 	_PF(UP);
+	_PF(LOWER_UP);
 #undef _PF
 	if (flags)
 		fprintf(fp, "%x", flags);
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