linux/include/net/dn_route.h
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   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 neighbour *n;
  71
  72        struct flowidn fld;
  73
  74        __le16 rt_saddr;
  75        __le16 rt_daddr;
  76        __le16 rt_gateway;
  77        __le16 rt_local_src;    /* Source used for forwarding packets */
  78        __le16 rt_src_map;
  79        __le16 rt_dst_map;
  80
  81        unsigned int rt_flags;
  82        unsigned int rt_type;
  83};
  84
  85static inline bool dn_is_input_route(struct dn_route *rt)
  86{
  87        return rt->fld.flowidn_iif != 0;
  88}
  89
  90static inline bool dn_is_output_route(struct dn_route *rt)
  91{
  92        return rt->fld.flowidn_iif == 0;
  93}
  94
  95extern void dn_route_init(void);
  96extern void dn_route_cleanup(void);
  97
  98#include <net/sock.h>
  99#include <linux/if_arp.h>
 100
 101static inline void dn_rt_send(struct sk_buff *skb)
 102{
 103        dev_queue_xmit(skb);
 104}
 105
 106static inline void dn_rt_finish_output(struct sk_buff *skb, char *dst, char *src)
 107{
 108        struct net_device *dev = skb->dev;
 109
 110        if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
 111                dst = NULL;
 112
 113        if (dev_hard_header(skb, dev, ETH_P_DNA_RT, dst, src, skb->len) >= 0)
 114                dn_rt_send(skb);
 115        else
 116                kfree_skb(skb);
 117}
 118
 119#endif /* _NET_DN_ROUTE_H */
 120
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