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
ipx_hdr(struct sk_buff * skb)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
ipx_sk(struct sock * sk)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
ipxitf_hold(struct ipx_interface * intrfc)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
ipxitf_put(struct ipx_interface * intrfc)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
ipxrtr_hold(struct ipx_route * rt)166 static __inline__ void ipxrtr_hold(struct ipx_route *rt)
167 {
168 refcount_inc(&rt->refcnt);
169 }
170
ipxrtr_put(struct ipx_route * rt)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_ */
177