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
18extern struct sk_buff *dn_alloc_skb(struct sock *sk, int size, int pri);
19extern int dn_route_output(struct dst_entry **pprt, dn_address dst, dn_address src, int flags);
20extern int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
21extern int dn_cache_getroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
22extern void dn_rt_cache_flush(int delay);
23
24/* Masks for flags field */
25#define DN_RT_F_PID 0x07 /* Mask for packet type                      */
26#define DN_RT_F_PF  0x80 /* Padding Follows                           */
27#define DN_RT_F_VER 0x40 /* Version =0 discard packet if ==1          */
28#define DN_RT_F_IE  0x20 /* Intra Ethernet, Reserved in short pkt     */
29#define DN_RT_F_RTS 0x10 /* Packet is being returned to sender        */
30#define DN_RT_F_RQR 0x08 /* Return packet to sender upon non-delivery */
31
32/* Mask for types of routing packets */
33#define DN_RT_PKT_MSK   0x06
34/* Types of routing packets */
35#define DN_RT_PKT_SHORT 0x02 /* Short routing packet */
36#define DN_RT_PKT_LONG  0x06 /* Long routing packet  */
37
38/* Mask for control/routing selection */
39#define DN_RT_PKT_CNTL  0x01 /* Set to 1 if a control packet  */
40/* Types of control packets */
41#define DN_RT_CNTL_MSK  0x0f /* Mask for control packets      */
42#define DN_RT_PKT_INIT  0x01 /* Initialisation packet         */
43#define DN_RT_PKT_VERI  0x03 /* Verification Message          */
44#define DN_RT_PKT_HELO  0x05 /* Hello and Test Message        */
45#define DN_RT_PKT_L1RT  0x07 /* Level 1 Routing Message       */
46#define DN_RT_PKT_L2RT  0x09 /* Level 2 Routing Message       */
47#define DN_RT_PKT_ERTH  0x0b /* Ethernet Router Hello         */
48#define DN_RT_PKT_EEDH  0x0d /* Ethernet EndNode Hello        */
49
50/* Values for info field in hello message */
51#define DN_RT_INFO_TYPE 0x03 /* Type mask                     */
52#define DN_RT_INFO_L1RT 0x02 /* L1 Router                     */
53#define DN_RT_INFO_L2RT 0x01 /* L2 Router                     */
54#define DN_RT_INFO_ENDN 0x03 /* EndNode                       */
55#define DN_RT_INFO_VERI 0x04 /* Verification Reqd.            */
56#define DN_RT_INFO_RJCT 0x08 /* Reject Flag, Reserved         */
57#define DN_RT_INFO_VFLD 0x10 /* Verification Failed, Reserved */
58#define DN_RT_INFO_NOML 0x20 /* No Multicast traffic accepted */
59#define DN_RT_INFO_BLKR 0x40 /* Blocking Requested            */
60
61/*
62 * The key structure is what we used to look up the route.
63 * The rt_saddr & rt_daddr entries are the same as key.saddr & key.daddr
64 * except for local input routes, where the rt_saddr = key.daddr and
65 * rt_daddr = key.saddr to allow the route to be used for returning
66 * packets to the originating host.
67 */
68struct dn_route {
69	union {
70		struct dst_entry dst;
71		struct dn_route *rt_next;
72	} u;
73	struct {
74		unsigned short saddr;
75		unsigned short daddr;
76		int iif;
77		int oif;
78		u32 fwmark;
79	} key;
80	unsigned short rt_saddr;
81	unsigned short rt_daddr;
82	unsigned char rt_type;
83	unsigned char rt_scope;
84	unsigned char rt_protocol;
85	unsigned char rt_table;
86};
87
88extern void dn_route_init(void);
89extern void dn_route_cleanup(void);
90
91#include <net/sock.h>
92#include <linux/if_arp.h>
93
94static inline void dn_rt_send(struct sk_buff *skb)
95{
96	dev_queue_xmit(skb);
97}
98
99static inline void dn_rt_finish_output(struct sk_buff *skb, char *dst)
100{
101	struct net_device *dev = skb->dev;
102
103	if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
104		dst = NULL;
105
106	if (!dev->hard_header || (dev->hard_header(skb, dev, ETH_P_DNA_RT,
107			dst, NULL, skb->len) >= 0))
108		dn_rt_send(skb);
109	else
110		kfree_skb(skb);
111}
112
113static inline void dn_nsp_send(struct sk_buff *skb)
114{
115	struct sock *sk = skb->sk;
116	struct dn_scp *scp = &sk->protinfo.dn;
117	struct dst_entry *dst;
118
119	skb->h.raw = skb->data;
120	scp->stamp = jiffies;
121
122	if ((dst = sk->dst_cache) && !dst->obsolete) {
123try_again:
124		skb->dst = dst_clone(dst);
125		dst->output(skb);
126		return;
127	}
128
129	dst_release(xchg(&sk->dst_cache, NULL));
130
131	if (dn_route_output(&sk->dst_cache, dn_saddr2dn(&scp->peer), dn_saddr2dn(&scp->addr), 0) == 0) {
132		dst = sk->dst_cache;
133		goto try_again;
134	}
135
136	sk->err = EHOSTUNREACH;
137	if (!sk->dead)
138		sk->state_change(sk);
139}
140
141#endif /* _NET_DN_ROUTE_H */
142