net: Unbreak userspace usage of linux/mroute.h

Nothing in linux/pim.h should be exported to userspace.

This should fix the XORP build failure reported by
Jose Calhariz, the debain package maintainer.

Nothing originally in linux/mroute.h was exported to userspace
ever, but some of this stuff started to be when it was moved into
this new linux/pim.h, and that was wrong. If we didn't provide these
definitions for 10 years we can reasonably expect that applications
defined this stuff locally or used GLIBC headers providing the
protocol definitions. And as such the only result of this can
be conflict and userland build breakage.

Signed-off-by: David S. Miller <[e-mail]>

include/linux/Kbuild

···
 unifdef-y += patchkey.h
 unifdef-y += pci.h
 unifdef-y += personality.h
-unifdef-y += pim.h
 unifdef-y += pktcdvd.h
 unifdef-y += pmu.h
 unifdef-y += poll.h

include/linux/mroute.h

···
 #ifdef __KERNEL__
 #include <linux/in.h>
 #endif
-#include <linux/pim.h>
 
 /*
  *	Based on the MROUTING 3.5 defines primarily to keep
···
  */
 
 #ifdef __KERNEL__
+#include <linux/pim.h>
 #include <net/sock.h>
 
 #ifdef CONFIG_IP_MROUTE

include/linux/mroute6.h

···
 
 #ifdef __KERNEL__
 
+#include <linux/pim.h>
 #include <linux/skbuff.h>	/* for struct sk_buff_head */
 
 #ifdef CONFIG_IPV6_MROUTE

include/linux/pim.h

···
 
 #include <asm/byteorder.h>
 
-#ifndef __KERNEL__
-struct pim {
-#if defined(__LITTLE_ENDIAN_BITFIELD)
-	__u8	pim_type:4,		/* PIM message type */
-		pim_ver:4;		/* PIM version */
-#elif defined(__BIG_ENDIAN_BITFIELD)
-	__u8	pim_ver:4;		/* PIM version */
-		pim_type:4;		/* PIM message type */
-#endif
-	__u8	pim_rsv;		/* Reserved */
-	__be16	pim_cksum;		/* Checksum */
-};
-
-#define PIM_MINLEN		8
-#endif
-
 /* Message types - V1 */
 #define PIM_V1_VERSION		__constant_htonl(0x10000000)
 #define PIM_V1_REGISTER		1
···
 #define PIM_VERSION		2
 #define PIM_REGISTER		1
 
-#if defined(__KERNEL__)
 #define PIM_NULL_REGISTER	__constant_htonl(0x40000000)
 
 /* PIMv2 register message header layout (ietf-draft-idmr-pimvsm-v2-00.ps */
···
 
 struct sk_buff;
 extern int pim_rcv_v1(struct sk_buff *);
-#endif
 #endif