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 */