include/net/dn_route.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef _NET_DN_ROUTE_H
   3 #define _NET_DN_ROUTE_H
   4
   5 /******************************************************************************
   6     (c) 1995-1998 E.M. Serrat           emserrat@geocities.com
   7
   8 *******************************************************************************/
   9
  10 struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
  11 int dn_route_output_sock(struct dst_entry __rcu **pprt, struct flowidn *,
  12                          struct sock *sk, int flags);
  13 int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
  14 void dn_rt_cache_flush(int delay);
  15 int dn_route_rcv(struct sk_buff *skb, struct net_device *dev,
  16                  struct packet_type *pt, struct net_device *orig_dev);
  17
  18 /* Masks for flags field */
  19 #define DN_RT_F_PID 0x07 /* Mask for packet type                      */
  20 #define DN_RT_F_PF  0x80 /* Padding Follows                           */
  21 #define DN_RT_F_VER 0x40 /* Version =0 discard packet if ==1          */
  22 #define DN_RT_F_IE  0x20 /* Intra Ethernet, Reserved in short pkt     */
  23 #define DN_RT_F_RTS 0x10 /* Packet is being returned to sender        */
  24 #define DN_RT_F_RQR 0x08 /* Return packet to sender upon non-delivery */
  25
  26 /* Mask for types of routing packets */
  27 #define DN_RT_PKT_MSK   0x06
  28 /* Types of routing packets */
  29 #define DN_RT_PKT_SHORT 0x02 /* Short routing packet */
  30 #define DN_RT_PKT_LONG  0x06 /* Long routing packet  */
  31
  32 /* Mask for control/routing selection */
  33 #define DN_RT_PKT_CNTL  0x01 /* Set to 1 if a control packet  */
  34 /* Types of control packets */
  35 #define DN_RT_CNTL_MSK  0x0f /* Mask for control packets      */
  36 #define DN_RT_PKT_INIT  0x01 /* Initialisation packet         */
  37 #define DN_RT_PKT_VERI  0x03 /* Verification Message          */
  38 #define DN_RT_PKT_HELO  0x05 /* Hello and Test Message        */
  39 #define DN_RT_PKT_L1RT  0x07 /* Level 1 Routing Message       */
  40 #define DN_RT_PKT_L2RT  0x09 /* Level 2 Routing Message       */
  41 #define DN_RT_PKT_ERTH  0x0b /* Ethernet Router Hello         */
  42 #define DN_RT_PKT_EEDH  0x0d /* Ethernet EndNode Hello        */
  43
  44 /* Values for info field in hello message */
  45 #define DN_RT_INFO_TYPE 0x03 /* Type mask                     */
  46 #define DN_RT_INFO_L1RT 0x02 /* L1 Router                     */
  47 #define DN_RT_INFO_L2RT 0x01 /* L2 Router                     */
  48 #define DN_RT_INFO_ENDN 0x03 /* EndNode                       */
  49 #define DN_RT_INFO_VERI 0x04 /* Verification Reqd.            */
  50 #define DN_RT_INFO_RJCT 0x08 /* Reject Flag, Reserved         */
  51 #define DN_RT_INFO_VFLD 0x10 /* Verification Failed, Reserved */
  52 #define DN_RT_INFO_NOML 0x20 /* No Multicast traffic accepted */
  53 #define DN_RT_INFO_BLKR 0x40 /* Blocking Requested            */
  54
  55 /*
  56  * The fl structure is what we used to look up the route.
  57  * The rt_saddr & rt_daddr entries are the same as key.saddr & key.daddr
  58  * except for local input routes, where the rt_saddr = fl.fld_dst and
  59  * rt_daddr = fl.fld_src to allow the route to be used for returning
  60  * packets to the originating host.
  61  */
  62 struct dn_route {
  63         struct dst_entry dst;
  64         struct dn_route __rcu *dn_next;
  65
  66         struct neighbour *n;
  67
  68         struct flowidn fld;
  69
  70         __le16 rt_saddr;
  71         __le16 rt_daddr;
  72         __le16 rt_gateway;
  73         __le16 rt_local_src;    /* Source used for forwarding packets */
  74         __le16 rt_src_map;
  75         __le16 rt_dst_map;
  76
  77         unsigned int rt_flags;
  78         unsigned int rt_type;
  79 };
  80
  81 static inline bool dn_is_input_route(struct dn_route *rt)
  82 {
  83         return rt->fld.flowidn_iif != 0;
  84 }
  85
  86 static inline bool dn_is_output_route(struct dn_route *rt)
  87 {
  88         return rt->fld.flowidn_iif == 0;
  89 }
  90
  91 void dn_route_init(void);
  92 void dn_route_cleanup(void);
  93
  94 #include <net/sock.h>
  95 #include <linux/if_arp.h>
  96
  97 static inline void dn_rt_send(struct sk_buff *skb)
  98 {
  99         dev_queue_xmit(skb);
 100 }
 101
 102 static inline void dn_rt_finish_output(struct sk_buff *skb, char *dst, char *src)
 103 {
 104         struct net_device *dev = skb->dev;
 105
 106         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
 107                 dst = NULL;
 108
 109         if (dev_hard_header(skb, dev, ETH_P_DNA_RT, dst, src, skb->len) >= 0)
 110                 dn_rt_send(skb);
 111         else
 112                 kfree_skb(skb);
 113 }
 114
 115 #endif /* _NET_DN_ROUTE_H */