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
 18struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
 19int dn_route_output_sock(struct dst_entry __rcu **pprt, struct flowidn *,
 20			 struct sock *sk, int flags);
 21int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
 22void dn_rt_cache_flush(int delay);
 23int 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 */
 70struct 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
 89static inline bool dn_is_input_route(struct dn_route *rt)
 90{
 91	return rt->fld.flowidn_iif != 0;
 92}
 93
 94static inline bool dn_is_output_route(struct dn_route *rt)
 95{
 96	return rt->fld.flowidn_iif == 0;
 97}
 98
 99void dn_route_init(void);
100void dn_route_cleanup(void);
101
102#include <net/sock.h>
103#include <linux/if_arp.h>
104
105static inline void dn_rt_send(struct sk_buff *skb)
106{
107	dev_queue_xmit(skb);
108}
109
110static 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 */