Appletalk: more cleanups and code reorganization

- rename at_addr to atalk_addr, netrange to atalk_netrange
- use kerneldoc style comments for some structs and functions
- move the IP over DDP handling code out of atalk_rcv into handle_ip_over_ddp,
  that is optimized out when this feature was not selected by the user
- move the routing handling code out of atalk_rcv into atalk_route_packets
- create ddp_hdr and aarp_hdr inline functions to access those protocol headers
  on the skb
- lots of CodingStyle cleanups

include/linux/atalk.h

+#ifndef __LINUX_ATALK_H__
+#define __LINUX_ATALK_H__
 /*
  * AppleTalk networking structures
  *
  * The following are directly referenced from the University Of Michigan
  * netatalk for compatibility reasons.
  */
-
-#ifndef __LINUX_ATALK_H__
-#define __LINUX_ATALK_H__
-
 #define ATPORT_FIRST	1
 #define ATPORT_RESERVED	128
 #define ATPORT_LAST	254		/* 254 is only legal on localtalk */ 
@@ -20,49 +18,51 @@
 
 #define SIOCATALKDIFADDR       (SIOCPROTOPRIVATE + 0)
 
-struct at_addr 
-{
+struct atalk_addr {
 	__u16	s_net;
 	__u8	s_node;
 };
 
-struct sockaddr_at 
-{
+struct sockaddr_at {
 	sa_family_t	  sat_family;
 	__u8		  sat_port;
-	struct at_addr	sat_addr;
-	char		sat_zero[ 8 ];
+	struct atalk_addr sat_addr;
+	char		  sat_zero[8];
 };
 
-struct netrange 
-{
+struct atalk_netrange {
 	__u8	nr_phase;
 	__u16	nr_firstnet;
 	__u16	nr_lastnet;
 };
 
-struct atalk_route
-{
+struct atalk_route {
 	struct net_device  *dev;
-	struct at_addr target;
-	struct at_addr gateway;
+	struct atalk_addr  target;
+	struct atalk_addr  gateway;
 	int		   flags;
 	struct atalk_route *next;
 };
 
-struct atalk_iface
-{
+/**
+ *	struct atalk_iface - AppleTalk Interface
+ *	@dev - Network device associated with this interface
+ *	@address - Our address
+ *	@status - What are we doing?
+ *	@nets - Associated direct netrange
+ *	@next - next element in the list of interfaces
+ */
+struct atalk_iface {
 	struct net_device	*dev;
-	struct at_addr address;		/* Our address */
-	int status;			/* What are we doing? */
+	struct atalk_addr	address;
+	int			status;
 #define ATIF_PROBE	1		/* Probing for an address */
 #define ATIF_PROBE_FAIL	2		/* Probe collided */
-	struct netrange nets;		/* Associated direct netrange */
+	struct atalk_netrange	nets;
 	struct atalk_iface	*next;
 };
 	
-struct atalk_sock
-{
+struct atalk_sock {
 	unsigned short	dest_net;
 	unsigned short	src_net;
 	unsigned char	dest_node;
@@ -75,12 +75,15 @@ struct atalk_sock
 
 #include <asm/byteorder.h>
 
-struct ddpehdr
-{
+struct ddpehdr {
 #ifdef __LITTLE_ENDIAN_BITFIELD
-	__u16	deh_len:10, deh_hops:4, deh_pad:2;
+	__u16	deh_len:10,
+		deh_hops:4,
+		deh_pad:2;
 #else
-	__u16	deh_pad:2, deh_hops:4, deh_len:10;
+	__u16	deh_pad:2,
+		deh_hops:4,
+		deh_len:10;
 #endif
 	__u16	deh_sum;
 	__u16	deh_dnet;
@@ -92,30 +95,35 @@ struct ddpehdr
 	/* And netatalk apps expect to stick the type in themselves */
 };
 
+static __inline__ struct ddpehdr *ddp_hdr(struct sk_buff *skb)
+{
+	return (struct ddpehdr *)skb->h.raw;
+}
+
 /*
  *	Don't drop the struct into the struct above.  You'll get some
  *	surprise padding.
  */
- 
-struct ddpebits
-{
+struct ddpebits {
 #ifdef __LITTLE_ENDIAN_BITFIELD
-	__u16	deh_len:10, deh_hops:4, deh_pad:2;
+	__u16	deh_len:10,
+		deh_hops:4,
+		deh_pad:2;
 #else
-	__u16	deh_pad:2, deh_hops:4, deh_len:10;
+	__u16	deh_pad:2,
+		deh_hops:4,
+		deh_len:10;
 #endif
 };
 
-/*
- *	Short form header
- */
- 
-struct ddpshdr
-{
+/* Short form header */
+struct ddpshdr {
 #ifdef __LITTLE_ENDIAN_BITFIELD
-	__u16	dsh_len:10, dsh_pad:6;
+	__u16	dsh_len:10,
+		dsh_pad:6;
 #else
-	__u16	dsh_pad:6, dsh_len:10;
+	__u16	dsh_pad:6,
+		dsh_len:10;
 #endif
 	__u8	dsh_dport;
 	__u8	dsh_sport;
@@ -123,9 +131,7 @@ struct ddpshdr
 };
 
 /* AppleTalk AARP headers */
-
-struct elapaarp
-{
+struct elapaarp {
 	__u16	hw_type;
 #define AARP_HW_TYPE_ETHERNET		1
 #define AARP_HW_TYPE_TOKENRING		2
@@ -147,29 +153,43 @@ struct elapaarp
 	__u8	pa_dst_node		__attribute__ ((packed));	
 };
 
-#define AARP_EXPIRY_TIME	(5*60*HZ)	/* Not specified - how long till we drop a resolved entry */
-#define AARP_HASH_SIZE		16		/* Size of hash table */
-#define AARP_TICK_TIME		(HZ/5)		/* Fast retransmission timer when resolving */
-#define AARP_RETRANSMIT_LIMIT	10		/* Send 10 requests then give up (2 seconds) */
-#define AARP_RESOLVE_TIME	(10*HZ)		/* Some value bigger than total retransmit time + a bit for last reply to appear and to stop continual requests */
+static __inline__ struct elapaarp *aarp_hdr(struct sk_buff *skb)
+{
+	return (struct elapaarp *)skb->h.raw;
+}
+
+/* Not specified - how long till we drop a resolved entry */
+#define AARP_EXPIRY_TIME	(5 * 60 * HZ)
+/* Size of hash table */
+#define AARP_HASH_SIZE		16
+/* Fast retransmission timer when resolving */
+#define AARP_TICK_TIME		(HZ / 5)
+/* Send 10 requests then give up (2 seconds) */
+#define AARP_RETRANSMIT_LIMIT	10
+/*
+ * Some value bigger than total retransmit time + a bit for last reply to
+ * appear and to stop continual requests
+ */
+#define AARP_RESOLVE_TIME	(10 * HZ)
 
 extern struct datalink_proto *ddp_dl, *aarp_dl;
 extern void aarp_proto_init(void);
-/* Inter module exports */
 
-/*
- *	Give a device find its atif control structure
- */
+/* Inter module exports */
 
+/* Give a device find its atif control structure */
 static inline struct atalk_iface *atalk_find_dev(struct net_device *dev)
 {
 	return dev->atalk_ptr;
 }
 
-extern struct at_addr *atalk_find_dev_addr(struct net_device *dev);
-extern struct net_device *atrtr_get_dev(struct at_addr *sa);
-extern int aarp_send_ddp(struct net_device *dev,struct sk_buff *skb, struct at_addr *sa, void *hwaddr);
-extern void aarp_send_probe(struct net_device *dev, struct at_addr *addr);
+extern struct atalk_addr *atalk_find_dev_addr(struct net_device *dev);
+extern struct net_device *atrtr_get_dev(struct atalk_addr *sa);
+extern int		 aarp_send_ddp(struct net_device *dev,
+				       struct sk_buff *skb,
+				       struct atalk_addr *sa, void *hwaddr);
+extern void		 aarp_send_probe(struct net_device *dev,
+					 struct atalk_addr *addr);
 extern void		 aarp_device_down(struct net_device *dev);
 
 #ifdef MODULE