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