root/include/net/ipx.h

INCLUDED FROM

DEFINITIONS

1. ipx_sk
2. ipxitf_hold
3. ipxitf_put
4. ipxrtr_hold
5. ipxrtr_put

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _NET_INET_IPX_H_
   3 #define _NET_INET_IPX_H_
   4 /*
   5  *      The following information is in its entirety obtained from:
   6  *
   7  *      Novell 'IPX Router Specification' Version 1.10 
   8  *              Part No. 107-000029-001
   9  *
  10  *      Which is available from ftp.novell.com
  11  */
  12 
  13 #include <linux/netdevice.h>
  14 #include <net/datalink.h>
  15 #include <linux/ipx.h>
  16 #include <linux/list.h>
  17 #include <linux/slab.h>
  18 #include <linux/refcount.h>
  19 
  20 struct ipx_address {
  21         __be32  net;
  22         __u8    node[IPX_NODE_LEN]; 
  23         __be16  sock;
  24 };
  25 
  26 #define ipx_broadcast_node      "\377\377\377\377\377\377"
  27 #define ipx_this_node           "\0\0\0\0\0\0"
  28 
  29 #define IPX_MAX_PPROP_HOPS 8
  30 
  31 struct ipxhdr {
  32         __be16                  ipx_checksum __packed;
  33 #define IPX_NO_CHECKSUM cpu_to_be16(0xFFFF)
  34         __be16                  ipx_pktsize __packed;
  35         __u8                    ipx_tctrl;
  36         __u8                    ipx_type;
  37 #define IPX_TYPE_UNKNOWN        0x00
  38 #define IPX_TYPE_RIP            0x01    /* may also be 0 */
  39 #define IPX_TYPE_SAP            0x04    /* may also be 0 */
  40 #define IPX_TYPE_SPX            0x05    /* SPX protocol */
  41 #define IPX_TYPE_NCP            0x11    /* $lots for docs on this (SPIT) */
  42 #define IPX_TYPE_PPROP          0x14    /* complicated flood fill brdcast */
  43         struct ipx_address      ipx_dest __packed;
  44         struct ipx_address      ipx_source __packed;
  45 };
  46 
  47 /* From af_ipx.c */
  48 extern int sysctl_ipx_pprop_broadcasting;
  49 
  50 struct ipx_interface {
  51         /* IPX address */
  52         __be32                  if_netnum;
  53         unsigned char           if_node[IPX_NODE_LEN];
  54         refcount_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         refcount_t              refcnt;
  81 };
  82 
  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 
 119 #define IPX_MIN_EPHEMERAL_SOCKET        0x4000
 120 #define IPX_MAX_EPHEMERAL_SOCKET        0x7fff
 121 
 122 extern struct list_head ipx_routes;
 123 extern rwlock_t ipx_routes_lock;
 124 
 125 extern struct list_head ipx_interfaces;
 126 struct ipx_interface *ipx_interfaces_head(void);
 127 extern spinlock_t ipx_interfaces_lock;
 128 
 129 extern struct ipx_interface *ipx_primary_net;
 130 
 131 int ipx_proc_init(void);
 132 void ipx_proc_exit(void);
 133 
 134 const char *ipx_frame_name(__be16);
 135 const char *ipx_device_name(struct ipx_interface *intrfc);
 136 
 137 static __inline__ void ipxitf_hold(struct ipx_interface *intrfc)
 138 {
 139         refcount_inc(&intrfc->refcnt);
 140 }
 141 
 142 void ipxitf_down(struct ipx_interface *intrfc);
 143 struct ipx_interface *ipxitf_find_using_net(__be32 net);
 144 int ipxitf_send(struct ipx_interface *intrfc, struct sk_buff *skb, char *node);
 145 __be16 ipx_cksum(struct ipxhdr *packet, int length);
 146 int ipxrtr_add_route(__be32 network, struct ipx_interface *intrfc,
 147                      unsigned char *node);
 148 void ipxrtr_del_routes(struct ipx_interface *intrfc);
 149 int ipxrtr_route_packet(struct sock *sk, struct sockaddr_ipx *usipx,
 150                         struct msghdr *msg, size_t len, int noblock);
 151 int ipxrtr_route_skb(struct sk_buff *skb);
 152 struct ipx_route *ipxrtr_lookup(__be32 net);
 153 int ipxrtr_ioctl(unsigned int cmd, void __user *arg);
 154 
 155 static __inline__ void ipxitf_put(struct ipx_interface *intrfc)
 156 {
 157         if (refcount_dec_and_test(&intrfc->refcnt))
 158                 ipxitf_down(intrfc);
 159 }
 160 
 161 static __inline__ void ipxrtr_hold(struct ipx_route *rt)
 162 {
 163                 refcount_inc(&rt->refcnt);
 164 }
 165 
 166 static __inline__ void ipxrtr_put(struct ipx_route *rt)
 167 {
 168                 if (refcount_dec_and_test(&rt->refcnt))
 169                                         kfree(rt);
 170 }
 171 #endif /* _NET_INET_IPX_H_ */