include/net/ipx.h

   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
  18 struct 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
  29 struct 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
  45 static __inline__ struct ipxhdr *ipx_hdr(struct sk_buff *skb)
  46 {
  47         return (struct ipxhdr *)skb_transport_header(skb);
  48 }
  49
  50 struct 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
  74 struct 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
  83 #ifdef __KERNEL__
  84 struct ipx_cb {
  85         u8      ipx_tctrl;
  86         __be32  ipx_dest_net;
  87         __be32  ipx_source_net;
  88         struct {
  89                 __be32 netnum;
  90                 int index;
  91         } last_hop;
  92 };
  93
  94 #include <net/sock.h>
  95
  96 struct ipx_sock {
  97         /* struct sock has to be the first member of ipx_sock */
  98         struct sock             sk;
  99         struct ipx_address      dest_addr;
 100         struct ipx_interface    *intrfc;
 101         __be16                  port;
 102 #ifdef CONFIG_IPX_INTERN
 103         unsigned char           node[IPX_NODE_LEN];
 104 #endif
 105         unsigned short          type;
 106         /*
 107          * To handle special ncp connection-handling sockets for mars_nwe,
 108          * the connection number must be stored in the socket.
 109          */
 110         unsigned short          ipx_ncp_conn;
 111 };
 112
 113 static inline struct ipx_sock *ipx_sk(struct sock *sk)
 114 {
 115         return (struct ipx_sock *)sk;
 116 }
 117
 118 #define IPX_SKB_CB(__skb) ((struct ipx_cb *)&((__skb)->cb[0]))
 119 #endif
 120
 121 #define IPX_MIN_EPHEMERAL_SOCKET        0x4000
 122 #define IPX_MAX_EPHEMERAL_SOCKET        0x7fff
 123
 124 extern struct list_head ipx_routes;
 125 extern rwlock_t ipx_routes_lock;
 126
 127 extern struct list_head ipx_interfaces;
 128 extern struct ipx_interface *ipx_interfaces_head(void);
 129 extern spinlock_t ipx_interfaces_lock;
 130
 131 extern struct ipx_interface *ipx_primary_net;
 132
 133 extern int ipx_proc_init(void);
 134 extern void ipx_proc_exit(void);
 135
 136 extern const char *ipx_frame_name(__be16);
 137 extern const char *ipx_device_name(struct ipx_interface *intrfc);
 138
 139 static __inline__ void ipxitf_hold(struct ipx_interface *intrfc)
 140 {
 141         atomic_inc(&intrfc->refcnt);
 142 }
 143
 144 extern void ipxitf_down(struct ipx_interface *intrfc);
 145
 146 static __inline__ void ipxitf_put(struct ipx_interface *intrfc)
 147 {
 148         if (atomic_dec_and_test(&intrfc->refcnt))
 149                 ipxitf_down(intrfc);
 150 }
 151
 152 static __inline__ void ipxrtr_hold(struct ipx_route *rt)
 153 {
 154                 atomic_inc(&rt->refcnt);
 155 }
 156
 157 static __inline__ void ipxrtr_put(struct ipx_route *rt)
 158 {
 159                 if (atomic_dec_and_test(&rt->refcnt))
 160                                         kfree(rt);
 161 }
 162 #endif /* _NET_INET_IPX_H_ */