LXR linux/include/net/dn

   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
  10struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
  11int dn_route_output_sock(struct dst_entry __rcu **pprt, struct flowidn *,
  12                         struct sock *sk, int flags);
  13int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
  14void dn_rt_cache_flush(int delay);
  15int 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 */
  62struct 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
  81static inline bool dn_is_input_route(struct dn_route *rt)
  82{
  83        return rt->fld.flowidn_iif != 0;
  84}
  85
  86static inline bool dn_is_output_route(struct dn_route *rt)
  87{
  88        return rt->fld.flowidn_iif == 0;
  89}
  90
  91void dn_route_init(void);
  92void dn_route_cleanup(void);
  93
  94#include <net/sock.h>
  95#include <linux/if_arp.h>
  96
  97static inline void dn_rt_send(struct sk_buff *skb)
  98{
  99        dev_queue_xmit(skb);
 100}
 101
 102static 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 */
 116