[AFS]: Add support for the CB.GetCapabilities operation.

Add support for the CB.GetCapabilities operation with which the fileserver can
ask the client for the following information:

 (1) The list of network interfaces it has available as IPv4 address + netmask
     plus the MTUs.

 (2) The client's UUID.

 (3) The extended capabilities of the client, for which the only current one
     is unified error mapping (abort code interpretation).

To support this, the patch adds the following routines to AFS:

 (1) A function to iterate through all the network interfaces using RTNETLINK
     to extract IPv4 addresses and MTUs.

 (2) A function to iterate through all the network interfaces using RTNETLINK
     to pull out the MAC address of the lowest index interface to use in UUID
     construction.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 42 insertions, 0 deletions

diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 8bed242..6120d4b 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -346,6 +346,40 @@ struct afs_permits {
 	struct afs_permit	permits[0];	/* the permits so far examined */
 };
 
+/*
+ * record of one of a system's set of network interfaces
+ */
+struct afs_interface {
+	unsigned	index;		/* interface index */
+	struct in_addr	address;	/* IPv4 address bound to interface */
+	struct in_addr	netmask;	/* netmask applied to address */
+	unsigned	mtu;		/* MTU of interface */
+};
+
+/*
+ * UUID definition [internet draft]
+ * - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns
+ *   increments since midnight 15th October 1582
+ *   - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID
+ *     time
+ * - the clock sequence is a 14-bit counter to avoid duplicate times
+ */
+struct afs_uuid {
+	u32		time_low;			/* low part of timestamp */
+	u16		time_mid;			/* mid part of timestamp */
+	u16		time_hi_and_version;		/* high part of timestamp and version  */
+#define AFS_UUID_TO_UNIX_TIME	0x01b21dd213814000
+#define AFS_UUID_TIMEHI_MASK	0x0fff
+#define AFS_UUID_VERSION_TIME	0x1000	/* time-based UUID */
+#define AFS_UUID_VERSION_NAME	0x3000	/* name-based UUID */
+#define AFS_UUID_VERSION_RANDOM	0x4000	/* (pseudo-)random generated UUID */
+	u8		clock_seq_hi_and_reserved;	/* clock seq hi and variant */
+#define AFS_UUID_CLOCKHI_MASK	0x3f
+#define AFS_UUID_VARIANT_STD	0x80
+	u8		clock_seq_low;			/* clock seq low */
+	u8		node[6];			/* spatially unique node ID (MAC addr) */
+};
+
 /*****************************************************************************/
 /*
  * callback.c
@@ -430,6 +464,7 @@ extern void afs_clear_inode(struct inode *);
 /*
  * main.c
  */
+extern struct afs_uuid afs_uuid;
 #ifdef AFS_CACHING_SUPPORT
 extern struct cachefs_netfs afs_cache_netfs;
 #endif
@@ -470,6 +505,7 @@ extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
 extern void afs_flat_call_destructor(struct afs_call *);
 extern void afs_transfer_reply(struct afs_call *, struct sk_buff *);
 extern void afs_send_empty_reply(struct afs_call *);
+extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
 extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *,
 			    size_t);
 
@@ -501,6 +537,12 @@ extern int afs_fs_init(void);
 extern void afs_fs_exit(void);
 
 /*
+ * use-rtnetlink.c
+ */
+extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool);
+extern int afs_get_MAC_address(u8 [6]);
+
+/*
  * vlclient.c
  */
 #ifdef AFS_CACHING_SUPPORT