include/net/dn_route.h

   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
  18 extern struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
  19 extern int dn_route_output_sock(struct dst_entry **pprt, struct flowi *, struct sock *sk, int flags);
  20 extern int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
  21 extern int dn_cache_getroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
  22 extern 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 fl 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 = fl.fld_dst and
  65  * rt_daddr = fl.fld_src to allow the route to be used for returning
  66  * packets to the originating host.
  67  */
  68 struct dn_route {
  69         union {
  70                 struct dst_entry dst;
  71                 struct dn_route *rt_next;
  72         } u;
  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 rt_flags;
  82         unsigned rt_type;
  83
  84         struct flowi fl;
  85 };
  86
  87 extern void dn_route_init(void);
  88 extern void dn_route_cleanup(void);
  89
  90 #include <net/sock.h>
  91 #include <linux/if_arp.h>
  92
  93 static inline void dn_rt_send(struct sk_buff *skb)
  94 {
  95         dev_queue_xmit(skb);
  96 }
  97
  98 static inline void dn_rt_finish_output(struct sk_buff *skb, char *dst, char *src)
  99 {
 100         struct net_device *dev = skb->dev;
 101
 102         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
 103                 dst = NULL;
 104
 105         if (!dev->hard_header || (dev->hard_header(skb, dev, ETH_P_DNA_RT,
 106                         dst, src, skb->len) >= 0))
 107                 dn_rt_send(skb);
 108         else
 109                 kfree_skb(skb);
 110 }
 111
 112 #endif /* _NET_DN_ROUTE_H */