dn_route.h revision 1d28f42c1bd4bb2363d88df74d0128b4da135b4a 
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, gfp_t pri);
19extern int dn_route_output_sock(struct dst_entry **pprt, struct flowi *, struct sock *sk, int flags);
20extern int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
21extern void dn_rt_cache_flush(int delay);
22
23/* Masks for flags field */
24#define DN_RT_F_PID 0x07 /* Mask for packet type                      */
25#define DN_RT_F_PF  0x80 /* Padding Follows                           */
26#define DN_RT_F_VER 0x40 /* Version =0 discard packet if ==1          */
27#define DN_RT_F_IE  0x20 /* Intra Ethernet, Reserved in short pkt     */
28#define DN_RT_F_RTS 0x10 /* Packet is being returned to sender        */
29#define DN_RT_F_RQR 0x08 /* Return packet to sender upon non-delivery */
30
31/* Mask for types of routing packets */
32#define DN_RT_PKT_MSK   0x06
33/* Types of routing packets */
34#define DN_RT_PKT_SHORT 0x02 /* Short routing packet */
35#define DN_RT_PKT_LONG  0x06 /* Long routing packet  */
36
37/* Mask for control/routing selection */
38#define DN_RT_PKT_CNTL  0x01 /* Set to 1 if a control packet  */
39/* Types of control packets */
40#define DN_RT_CNTL_MSK  0x0f /* Mask for control packets      */
41#define DN_RT_PKT_INIT  0x01 /* Initialisation packet         */
42#define DN_RT_PKT_VERI  0x03 /* Verification Message          */
43#define DN_RT_PKT_HELO  0x05 /* Hello and Test Message        */
44#define DN_RT_PKT_L1RT  0x07 /* Level 1 Routing Message       */
45#define DN_RT_PKT_L2RT  0x09 /* Level 2 Routing Message       */
46#define DN_RT_PKT_ERTH  0x0b /* Ethernet Router Hello         */
47#define DN_RT_PKT_EEDH  0x0d /* Ethernet EndNode Hello        */
48
49/* Values for info field in hello message */
50#define DN_RT_INFO_TYPE 0x03 /* Type mask                     */
51#define DN_RT_INFO_L1RT 0x02 /* L1 Router                     */
52#define DN_RT_INFO_L2RT 0x01 /* L2 Router                     */
53#define DN_RT_INFO_ENDN 0x03 /* EndNode                       */
54#define DN_RT_INFO_VERI 0x04 /* Verification Reqd.            */
55#define DN_RT_INFO_RJCT 0x08 /* Reject Flag, Reserved         */
56#define DN_RT_INFO_VFLD 0x10 /* Verification Failed, Reserved */
57#define DN_RT_INFO_NOML 0x20 /* No Multicast traffic accepted */
58#define DN_RT_INFO_BLKR 0x40 /* Blocking Requested            */
59
60/*
61 * The fl structure is what we used to look up the route.
62 * The rt_saddr & rt_daddr entries are the same as key.saddr & key.daddr
63 * except for local input routes, where the rt_saddr = fl.fld_dst and
64 * rt_daddr = fl.fld_src to allow the route to be used for returning
65 * packets to the originating host.
66 */
67struct dn_route {
68	struct dst_entry dst;
69
70	struct flowi fl;
71
72	__le16 rt_saddr;
73	__le16 rt_daddr;
74	__le16 rt_gateway;
75	__le16 rt_local_src;	/* Source used for forwarding packets */
76	__le16 rt_src_map;
77	__le16 rt_dst_map;
78
79	unsigned rt_flags;
80	unsigned rt_type;
81};
82
83static inline bool dn_is_input_route(struct dn_route *rt)
84{
85	return rt->fl.flowi_iif != 0;
86}
87
88static inline bool dn_is_output_route(struct dn_route *rt)
89{
90	return rt->fl.flowi_iif == 0;
91}
92
93extern void dn_route_init(void);
94extern void dn_route_cleanup(void);
95
96#include <net/sock.h>
97#include <linux/if_arp.h>
98
99static inline void dn_rt_send(struct sk_buff *skb)
100{
101	dev_queue_xmit(skb);
102}
103
104static inline void dn_rt_finish_output(struct sk_buff *skb, char *dst, char *src)
105{
106	struct net_device *dev = skb->dev;
107
108	if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
109		dst = NULL;
110
111	if (dev_hard_header(skb, dev, ETH_P_DNA_RT, dst, src, skb->len) >= 0)
112		dn_rt_send(skb);
113	else
114		kfree_skb(skb);
115}
116
117#endif /* _NET_DN_ROUTE_H */
118