1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef _NET_DN_ROUTE_H
3 #define _NET_DN_ROUTE_H
4
5 /******************************************************************************
6 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
7
8 *******************************************************************************/
9
10 struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
11 int dn_route_output_sock(struct dst_entry __rcu **pprt, struct flowidn *,
12 struct sock *sk, int flags);
13 int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
14 void dn_rt_cache_flush(int delay);
15 int dn_route_rcv(struct sk_buff *skb, struct net_device *dev,
16 struct packet_type *pt, struct net_device *orig_dev);
17
18 /* Masks for flags field */
19 #define DN_RT_F_PID 0x07 /* Mask for packet type */
20 #define DN_RT_F_PF 0x80 /* Padding Follows */
21 #define DN_RT_F_VER 0x40 /* Version =0 discard packet if ==1 */
22 #define DN_RT_F_IE 0x20 /* Intra Ethernet, Reserved in short pkt */
23 #define DN_RT_F_RTS 0x10 /* Packet is being returned to sender */
24 #define DN_RT_F_RQR 0x08 /* Return packet to sender upon non-delivery */
25
26 /* Mask for types of routing packets */
27 #define DN_RT_PKT_MSK 0x06
28 /* Types of routing packets */
29 #define DN_RT_PKT_SHORT 0x02 /* Short routing packet */
30 #define DN_RT_PKT_LONG 0x06 /* Long routing packet */
31
32 /* Mask for control/routing selection */
33 #define DN_RT_PKT_CNTL 0x01 /* Set to 1 if a control packet */
34 /* Types of control packets */
35 #define DN_RT_CNTL_MSK 0x0f /* Mask for control packets */
36 #define DN_RT_PKT_INIT 0x01 /* Initialisation packet */
37 #define DN_RT_PKT_VERI 0x03 /* Verification Message */
38 #define DN_RT_PKT_HELO 0x05 /* Hello and Test Message */
39 #define DN_RT_PKT_L1RT 0x07 /* Level 1 Routing Message */
40 #define DN_RT_PKT_L2RT 0x09 /* Level 2 Routing Message */
41 #define DN_RT_PKT_ERTH 0x0b /* Ethernet Router Hello */
42 #define DN_RT_PKT_EEDH 0x0d /* Ethernet EndNode Hello */
43
44 /* Values for info field in hello message */
45 #define DN_RT_INFO_TYPE 0x03 /* Type mask */
46 #define DN_RT_INFO_L1RT 0x02 /* L1 Router */
47 #define DN_RT_INFO_L2RT 0x01 /* L2 Router */
48 #define DN_RT_INFO_ENDN 0x03 /* EndNode */
49 #define DN_RT_INFO_VERI 0x04 /* Verification Reqd. */
50 #define DN_RT_INFO_RJCT 0x08 /* Reject Flag, Reserved */
51 #define DN_RT_INFO_VFLD 0x10 /* Verification Failed, Reserved */
52 #define DN_RT_INFO_NOML 0x20 /* No Multicast traffic accepted */
53 #define DN_RT_INFO_BLKR 0x40 /* Blocking Requested */
54
55 /*
56 * The fl structure is what we used to look up the route.
57 * The rt_saddr & rt_daddr entries are the same as key.saddr & key.daddr
58 * except for local input routes, where the rt_saddr = fl.fld_dst and
59 * rt_daddr = fl.fld_src to allow the route to be used for returning
60 * packets to the originating host.
61 */
62 struct dn_route {
63 struct dst_entry dst;
64 struct dn_route __rcu *dn_next;
65
66 struct neighbour *n;
67
68 struct flowidn fld;
69
70 __le16 rt_saddr;
71 __le16 rt_daddr;
72 __le16 rt_gateway;
73 __le16 rt_local_src; /* Source used for forwarding packets */
74 __le16 rt_src_map;
75 __le16 rt_dst_map;
76
77 unsigned int rt_flags;
78 unsigned int rt_type;
79 };
80
dn_is_input_route(struct dn_route * rt)81 static inline bool dn_is_input_route(struct dn_route *rt)
82 {
83 return rt->fld.flowidn_iif != 0;
84 }
85
dn_is_output_route(struct dn_route * rt)86 static inline bool dn_is_output_route(struct dn_route *rt)
87 {
88 return rt->fld.flowidn_iif == 0;
89 }
90
91 void dn_route_init(void);
92 void dn_route_cleanup(void);
93
94 #include <net/sock.h>
95 #include <linux/if_arp.h>
96
dn_rt_send(struct sk_buff * skb)97 static inline void dn_rt_send(struct sk_buff *skb)
98 {
99 dev_queue_xmit(skb);
100 }
101
dn_rt_finish_output(struct sk_buff * skb,char * dst,char * src)102 static inline void dn_rt_finish_output(struct sk_buff *skb, char *dst, char *src)
103 {
104 struct net_device *dev = skb->dev;
105
106 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
107 dst = NULL;
108
109 if (dev_hard_header(skb, dev, ETH_P_DNA_RT, dst, src, skb->len) >= 0)
110 dn_rt_send(skb);
111 else
112 kfree_skb(skb);
113 }
114
115 #endif /* _NET_DN_ROUTE_H */
116