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
  17 struct ipx_address {
  18         __be32  net;
  19         __u8    node[IPX_NODE_LEN];
  20         __be16  sock;
  21 };
  22
  23 #define ipx_broadcast_node      "\377\377\377\377\377\377"
  24 #define ipx_this_node           "\0\0\0\0\0\0"
  25
  26 #define IPX_MAX_PPROP_HOPS 8
  27
  28 struct ipxhdr {
  29         __be16                  ipx_checksum __attribute__ ((packed));
  30 #define IPX_NO_CHECKSUM __constant_htons(0xFFFF)
  31         __be16                  ipx_pktsize __attribute__ ((packed));
  32         __u8                    ipx_tctrl;
  33         __u8                    ipx_type;
  34 #define IPX_TYPE_UNKNOWN        0x00
  35 #define IPX_TYPE_RIP            0x01    /* may also be 0 */
  36 #define IPX_TYPE_SAP            0x04    /* may also be 0 */
  37 #define IPX_TYPE_SPX            0x05    /* SPX protocol */
  38 #define IPX_TYPE_NCP            0x11    /* $lots for docs on this (SPIT) */
  39 #define IPX_TYPE_PPROP          0x14    /* complicated flood fill brdcast */
  40         struct ipx_address      ipx_dest __attribute__ ((packed));
  41         struct ipx_address      ipx_source __attribute__ ((packed));
  42 };
  43
  44 static __inline__ struct ipxhdr *ipx_hdr(struct sk_buff *skb)
  45 {
  46         return (struct ipxhdr *)skb_transport_header(skb);
  47 }
  48
  49 struct ipx_interface {
  50         /* IPX address */
  51         __be32                  if_netnum;
  52         unsigned char           if_node[IPX_NODE_LEN];
  53         atomic_t                refcnt;
  54
  55         /* physical device info */
  56         struct net_device       *if_dev;
  57         struct datalink_proto   *if_dlink;
  58         __be16                  if_dlink_type;
  59
  60         /* socket support */
  61         unsigned short          if_sknum;
  62         struct hlist_head       if_sklist;
  63         spinlock_t              if_sklist_lock;
  64
  65         /* administrative overhead */
  66         int                     if_ipx_offset;
  67         unsigned char           if_internal;
  68         unsigned char           if_primary;
  69
  70         struct list_head        node; /* node in ipx_interfaces list */
  71 };
  72
  73 struct ipx_route {
  74         __be32                  ir_net;
  75         struct ipx_interface    *ir_intrfc;
  76         unsigned char           ir_routed;
  77         unsigned char           ir_router_node[IPX_NODE_LEN];
  78         struct list_head        node; /* node in ipx_routes list */
  79         atomic_t                refcnt;
  80 };
  81
  82 #ifdef __KERNEL__
  83 struct 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
  95 struct 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
 112 static 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 #endif
 119
 120 #define IPX_MIN_EPHEMERAL_SOCKET        0x4000
 121 #define IPX_MAX_EPHEMERAL_SOCKET        0x7fff
 122
 123 extern struct list_head ipx_routes;
 124 extern rwlock_t ipx_routes_lock;
 125
 126 extern struct list_head ipx_interfaces;
 127 extern struct ipx_interface *ipx_interfaces_head(void);
 128 extern spinlock_t ipx_interfaces_lock;
 129
 130 extern struct ipx_interface *ipx_primary_net;
 131
 132 extern int ipx_proc_init(void);
 133 extern void ipx_proc_exit(void);
 134
 135 extern const char *ipx_frame_name(__be16);
 136 extern const char *ipx_device_name(struct ipx_interface *intrfc);
 137
 138 static __inline__ void ipxitf_hold(struct ipx_interface *intrfc)
 139 {
 140         atomic_inc(&intrfc->refcnt);
 141 }
 142
 143 extern void ipxitf_down(struct ipx_interface *intrfc);
 144
 145 static __inline__ void ipxitf_put(struct ipx_interface *intrfc)
 146 {
 147         if (atomic_dec_and_test(&intrfc->refcnt))
 148                 ipxitf_down(intrfc);
 149 }
 150
 151 static __inline__ void ipxrtr_hold(struct ipx_route *rt)
 152 {
 153                 atomic_inc(&rt->refcnt);
 154 }
 155
 156 static __inline__ void ipxrtr_put(struct ipx_route *rt)
 157 {
 158                 if (atomic_dec_and_test(&rt->refcnt))
 159                                         kfree(rt);
 160 }
 161 #endif /* _NET_INET_IPX_H_ */