1 #ifndef _NET_DN_ROUTE_H
2 #define _NET_DN_ROUTE_H
3
4 /******************************************************************************
5 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16 *******************************************************************************/
17
18 struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
19 int dn_route_output_sock(struct dst_entry __rcu **pprt, struct flowidn *,
20 struct sock *sk, int flags);
21 int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
22 void dn_rt_cache_flush(int delay);
23 int dn_route_rcv(struct sk_buff *skb, struct net_device *dev,
24 struct packet_type *pt, struct net_device *orig_dev);
25
26 /* Masks for flags field */
27 #define DN_RT_F_PID 0x07 /* Mask for packet type */
28 #define DN_RT_F_PF 0x80 /* Padding Follows */
29 #define DN_RT_F_VER 0x40 /* Version =0 discard packet if ==1 */
30 #define DN_RT_F_IE 0x20 /* Intra Ethernet, Reserved in short pkt */
31 #define DN_RT_F_RTS 0x10 /* Packet is being returned to sender */
32 #define DN_RT_F_RQR 0x08 /* Return packet to sender upon non-delivery */
33
34 /* Mask for types of routing packets */
35 #define DN_RT_PKT_MSK 0x06
36 /* Types of routing packets */
37 #define DN_RT_PKT_SHORT 0x02 /* Short routing packet */
38 #define DN_RT_PKT_LONG 0x06 /* Long routing packet */
39
40 /* Mask for control/routing selection */
41 #define DN_RT_PKT_CNTL 0x01 /* Set to 1 if a control packet */
42 /* Types of control packets */
43 #define DN_RT_CNTL_MSK 0x0f /* Mask for control packets */
44 #define DN_RT_PKT_INIT 0x01 /* Initialisation packet */
45 #define DN_RT_PKT_VERI 0x03 /* Verification Message */
46 #define DN_RT_PKT_HELO 0x05 /* Hello and Test Message */
47 #define DN_RT_PKT_L1RT 0x07 /* Level 1 Routing Message */
48 #define DN_RT_PKT_L2RT 0x09 /* Level 2 Routing Message */
49 #define DN_RT_PKT_ERTH 0x0b /* Ethernet Router Hello */
50 #define DN_RT_PKT_EEDH 0x0d /* Ethernet EndNode Hello */
51
52 /* Values for info field in hello message */
53 #define DN_RT_INFO_TYPE 0x03 /* Type mask */
54 #define DN_RT_INFO_L1RT 0x02 /* L1 Router */
55 #define DN_RT_INFO_L2RT 0x01 /* L2 Router */
56 #define DN_RT_INFO_ENDN 0x03 /* EndNode */
57 #define DN_RT_INFO_VERI 0x04 /* Verification Reqd. */
58 #define DN_RT_INFO_RJCT 0x08 /* Reject Flag, Reserved */
59 #define DN_RT_INFO_VFLD 0x10 /* Verification Failed, Reserved */
60 #define DN_RT_INFO_NOML 0x20 /* No Multicast traffic accepted */
61 #define DN_RT_INFO_BLKR 0x40 /* Blocking Requested */
62
63 /*
64 * The fl structure is what we used to look up the route.
65 * The rt_saddr & rt_daddr entries are the same as key.saddr & key.daddr
66 * except for local input routes, where the rt_saddr = fl.fld_dst and
67 * rt_daddr = fl.fld_src to allow the route to be used for returning
68 * packets to the originating host.
69 */
70 struct dn_route {
71 struct dst_entry dst;
72 struct dn_route __rcu *dn_next;
73
74 struct neighbour *n;
75
76 struct flowidn fld;
77
78 __le16 rt_saddr;
79 __le16 rt_daddr;
80 __le16 rt_gateway;
81 __le16 rt_local_src; /* Source used for forwarding packets */
82 __le16 rt_src_map;
83 __le16 rt_dst_map;
84
85 unsigned int rt_flags;
86 unsigned int rt_type;
87 };
88
dn_is_input_route(struct dn_route * rt)89 static inline bool dn_is_input_route(struct dn_route *rt)
90 {
91 return rt->fld.flowidn_iif != 0;
92 }
93
dn_is_output_route(struct dn_route * rt)94 static inline bool dn_is_output_route(struct dn_route *rt)
95 {
96 return rt->fld.flowidn_iif == 0;
97 }
98
99 void dn_route_init(void);
100 void dn_route_cleanup(void);
101
102 #include <net/sock.h>
103 #include <linux/if_arp.h>
104
dn_rt_send(struct sk_buff * skb)105 static inline void dn_rt_send(struct sk_buff *skb)
106 {
107 dev_queue_xmit(skb);
108 }
109
dn_rt_finish_output(struct sk_buff * skb,char * dst,char * src)110 static inline void dn_rt_finish_output(struct sk_buff *skb, char *dst, char *src)
111 {
112 struct net_device *dev = skb->dev;
113
114 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
115 dst = NULL;
116
117 if (dev_hard_header(skb, dev, ETH_P_DNA_RT, dst, src, skb->len) >= 0)
118 dn_rt_send(skb);
119 else
120 kfree_skb(skb);
121 }
122
123 #endif /* _NET_DN_ROUTE_H */
124
