linux/include/net/ipx.h
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   1#ifndef _NET_INET_IPX_H_
   2#define _NET_INET_IPX_H_
   3/*
   4 *      The following information is in its entirety obtained from:
   5 *
   6 *      Novell 'IPX Router Specification' Version 1.10 
   7 *              Part No. 107-000029-001
   8 *
   9 *      Which is available from ftp.novell.com
  10 */
  11
  12#include <linux/netdevice.h>
  13#include <net/datalink.h>
  14#include <linux/ipx.h>
  15#include <linux/list.h>
  16#include <linux/slab.h>
  17
  18struct ipx_address {
  19        __be32  net;
  20        __u8    node[IPX_NODE_LEN]; 
  21        __be16  sock;
  22};
  23
  24#define ipx_broadcast_node      "\377\377\377\377\377\377"
  25#define ipx_this_node           "\0\0\0\0\0\0"
  26
  27#define IPX_MAX_PPROP_HOPS 8
  28
  29struct ipxhdr {
  30        __be16                  ipx_checksum __packed;
  31#define IPX_NO_CHECKSUM cpu_to_be16(0xFFFF)
  32        __be16                  ipx_pktsize __packed;
  33        __u8                    ipx_tctrl;
  34        __u8                    ipx_type;
  35#define IPX_TYPE_UNKNOWN        0x00
  36#define IPX_TYPE_RIP            0x01    /* may also be 0 */
  37#define IPX_TYPE_SAP            0x04    /* may also be 0 */
  38#define IPX_TYPE_SPX            0x05    /* SPX protocol */
  39#define IPX_TYPE_NCP            0x11    /* $lots for docs on this (SPIT) */
  40#define IPX_TYPE_PPROP          0x14    /* complicated flood fill brdcast */
  41        struct ipx_address      ipx_dest __packed;
  42        struct ipx_address      ipx_source __packed;
  43};
  44
  45static __inline__ struct ipxhdr *ipx_hdr(struct sk_buff *skb)
  46{
  47        return (struct ipxhdr *)skb_transport_header(skb);
  48}
  49
  50struct ipx_interface {
  51        /* IPX address */
  52        __be32                  if_netnum;
  53        unsigned char           if_node[IPX_NODE_LEN];
  54        atomic_t                refcnt;
  55
  56        /* physical device info */
  57        struct net_device       *if_dev;
  58        struct datalink_proto   *if_dlink;
  59        __be16                  if_dlink_type;
  60
  61        /* socket support */
  62        unsigned short          if_sknum;
  63        struct hlist_head       if_sklist;
  64        spinlock_t              if_sklist_lock;
  65
  66        /* administrative overhead */
  67        int                     if_ipx_offset;
  68        unsigned char           if_internal;
  69        unsigned char           if_primary;
  70        
  71        struct list_head        node; /* node in ipx_interfaces list */
  72};
  73
  74struct ipx_route {
  75        __be32                  ir_net;
  76        struct ipx_interface    *ir_intrfc;
  77        unsigned char           ir_routed;
  78        unsigned char           ir_router_node[IPX_NODE_LEN];
  79        struct list_head        node; /* node in ipx_routes list */
  80        atomic_t                refcnt;
  81};
  82
  83struct ipx_cb {
  84        u8      ipx_tctrl;
  85        __be32  ipx_dest_net;
  86        __be32  ipx_source_net;
  87        struct {
  88                __be32 netnum;
  89                int index;
  90        } last_hop;
  91};
  92
  93#include <net/sock.h>
  94
  95struct ipx_sock {
  96        /* struct sock has to be the first member of ipx_sock */
  97        struct sock             sk;
  98        struct ipx_address      dest_addr;
  99        struct ipx_interface    *intrfc;
 100        __be16                  port;
 101#ifdef CONFIG_IPX_INTERN
 102        unsigned char           node[IPX_NODE_LEN];
 103#endif
 104        unsigned short          type;
 105        /*
 106         * To handle special ncp connection-handling sockets for mars_nwe,
 107         * the connection number must be stored in the socket.
 108         */
 109        unsigned short          ipx_ncp_conn;
 110};
 111
 112static inline struct ipx_sock *ipx_sk(struct sock *sk)
 113{
 114        return (struct ipx_sock *)sk;
 115}
 116
 117#define IPX_SKB_CB(__skb) ((struct ipx_cb *)&((__skb)->cb[0]))
 118
 119#define IPX_MIN_EPHEMERAL_SOCKET        0x4000
 120#define IPX_MAX_EPHEMERAL_SOCKET        0x7fff
 121
 122extern struct list_head ipx_routes;
 123extern rwlock_t ipx_routes_lock;
 124
 125extern struct list_head ipx_interfaces;
 126extern struct ipx_interface *ipx_interfaces_head(void);
 127extern spinlock_t ipx_interfaces_lock;
 128
 129extern struct ipx_interface *ipx_primary_net;
 130
 131extern int ipx_proc_init(void);
 132extern void ipx_proc_exit(void);
 133
 134extern const char *ipx_frame_name(__be16);
 135extern const char *ipx_device_name(struct ipx_interface *intrfc);
 136
 137static __inline__ void ipxitf_hold(struct ipx_interface *intrfc)
 138{
 139        atomic_inc(&intrfc->refcnt);
 140}
 141
 142extern void ipxitf_down(struct ipx_interface *intrfc);
 143
 144static __inline__ void ipxitf_put(struct ipx_interface *intrfc)
 145{
 146        if (atomic_dec_and_test(&intrfc->refcnt))
 147                ipxitf_down(intrfc);
 148}
 149
 150static __inline__ void ipxrtr_hold(struct ipx_route *rt)
 151{
 152                atomic_inc(&rt->refcnt);
 153}
 154
 155static __inline__ void ipxrtr_put(struct ipx_route *rt)
 156{
 157                if (atomic_dec_and_test(&rt->refcnt))
 158                                        kfree(rt);
 159}
 160#endif /* _NET_INET_IPX_H_ */
 161
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