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 flowidn *, 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 flowidn fld;
 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 int rt_flags;
 80	unsigned int rt_type;
 81};
 82
 83static inline bool dn_is_input_route(struct dn_route *rt)
 84{
 85	return rt->fld.flowidn_iif != 0;
 86}
 87
 88static inline bool dn_is_output_route(struct dn_route *rt)
 89{
 90	return rt->fld.flowidn_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 */