include/net/ipx.h

   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 static __inline__ struct ipxhdr *ipx_hdr(struct sk_buff *skb)
  51 {
  52         return (struct ipxhdr *)skb_transport_header(skb);
  53 }
  54
  55 struct ipx_interface {
  56         /* IPX address */
  57         __be32                  if_netnum;
  58         unsigned char           if_node[IPX_NODE_LEN];
  59         refcount_t              refcnt;
  60
  61         /* physical device info */
  62         struct net_device       *if_dev;
  63         struct datalink_proto   *if_dlink;
  64         __be16                  if_dlink_type;
  65
  66         /* socket support */
  67         unsigned short          if_sknum;
  68         struct hlist_head       if_sklist;
  69         spinlock_t              if_sklist_lock;
  70
  71         /* administrative overhead */
  72         int                     if_ipx_offset;
  73         unsigned char           if_internal;
  74         unsigned char           if_primary;
  75
  76         struct list_head        node; /* node in ipx_interfaces list */
  77 };
  78
  79 struct ipx_route {
  80         __be32                  ir_net;
  81         struct ipx_interface    *ir_intrfc;
  82         unsigned char           ir_routed;
  83         unsigned char           ir_router_node[IPX_NODE_LEN];
  84         struct list_head        node; /* node in ipx_routes list */
  85         refcount_t              refcnt;
  86 };
  87
  88 struct ipx_cb {
  89         u8      ipx_tctrl;
  90         __be32  ipx_dest_net;
  91         __be32  ipx_source_net;
  92         struct {
  93                 __be32 netnum;
  94                 int index;
  95         } last_hop;
  96 };
  97
  98 #include <net/sock.h>
  99
 100 struct ipx_sock {
 101         /* struct sock has to be the first member of ipx_sock */
 102         struct sock             sk;
 103         struct ipx_address      dest_addr;
 104         struct ipx_interface    *intrfc;
 105         __be16                  port;
 106 #ifdef CONFIG_IPX_INTERN
 107         unsigned char           node[IPX_NODE_LEN];
 108 #endif
 109         unsigned short          type;
 110         /*
 111          * To handle special ncp connection-handling sockets for mars_nwe,
 112          * the connection number must be stored in the socket.
 113          */
 114         unsigned short          ipx_ncp_conn;
 115 };
 116
 117 static inline struct ipx_sock *ipx_sk(struct sock *sk)
 118 {
 119         return (struct ipx_sock *)sk;
 120 }
 121
 122 #define IPX_SKB_CB(__skb) ((struct ipx_cb *)&((__skb)->cb[0]))
 123
 124 #define IPX_MIN_EPHEMERAL_SOCKET        0x4000
 125 #define IPX_MAX_EPHEMERAL_SOCKET        0x7fff
 126
 127 extern struct list_head ipx_routes;
 128 extern rwlock_t ipx_routes_lock;
 129
 130 extern struct list_head ipx_interfaces;
 131 struct ipx_interface *ipx_interfaces_head(void);
 132 extern spinlock_t ipx_interfaces_lock;
 133
 134 extern struct ipx_interface *ipx_primary_net;
 135
 136 int ipx_proc_init(void);
 137 void ipx_proc_exit(void);
 138
 139 const char *ipx_frame_name(__be16);
 140 const char *ipx_device_name(struct ipx_interface *intrfc);
 141
 142 static __inline__ void ipxitf_hold(struct ipx_interface *intrfc)
 143 {
 144         refcount_inc(&intrfc->refcnt);
 145 }
 146
 147 void ipxitf_down(struct ipx_interface *intrfc);
 148 struct ipx_interface *ipxitf_find_using_net(__be32 net);
 149 int ipxitf_send(struct ipx_interface *intrfc, struct sk_buff *skb, char *node);
 150 __be16 ipx_cksum(struct ipxhdr *packet, int length);
 151 int ipxrtr_add_route(__be32 network, struct ipx_interface *intrfc,
 152                      unsigned char *node);
 153 void ipxrtr_del_routes(struct ipx_interface *intrfc);
 154 int ipxrtr_route_packet(struct sock *sk, struct sockaddr_ipx *usipx,
 155                         struct msghdr *msg, size_t len, int noblock);
 156 int ipxrtr_route_skb(struct sk_buff *skb);
 157 struct ipx_route *ipxrtr_lookup(__be32 net);
 158 int ipxrtr_ioctl(unsigned int cmd, void __user *arg);
 159
 160 static __inline__ void ipxitf_put(struct ipx_interface *intrfc)
 161 {
 162         if (refcount_dec_and_test(&intrfc->refcnt))
 163                 ipxitf_down(intrfc);
 164 }
 165
 166 static __inline__ void ipxrtr_hold(struct ipx_route *rt)
 167 {
 168                 refcount_inc(&rt->refcnt);
 169 }
 170
 171 static __inline__ void ipxrtr_put(struct ipx_route *rt)
 172 {
 173                 if (refcount_dec_and_test(&rt->refcnt))
 174                                         kfree(rt);
 175 }
 176 #endif /* _NET_INET_IPX_H_ */