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
ipx_sk(struct sock * sk)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
ipxitf_hold(struct ipx_interface * intrfc)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
ipxitf_put(struct ipx_interface * intrfc)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
ipxrtr_hold(struct ipx_route * rt)161 static __inline__ void ipxrtr_hold(struct ipx_route *rt)
162 {
163 refcount_inc(&rt->refcnt);
164 }
165
ipxrtr_put(struct ipx_route * rt)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_ */
172