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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#include <linux/types.h>
11#include <net/dst.h>
12
13struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
14int dn_route_output_sock(struct dst_entry __rcu **pprt, struct flowidn *,
15 struct sock *sk, int flags);
16int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
17void dn_rt_cache_flush(int delay);
18int dn_route_rcv(struct sk_buff *skb, struct net_device *dev,
19 struct packet_type *pt, struct net_device *orig_dev);
20
21/* Masks for flags field */
22#define DN_RT_F_PID 0x07 /* Mask for packet type */
23#define DN_RT_F_PF 0x80 /* Padding Follows */
24#define DN_RT_F_VER 0x40 /* Version =0 discard packet if ==1 */
25#define DN_RT_F_IE 0x20 /* Intra Ethernet, Reserved in short pkt */
26#define DN_RT_F_RTS 0x10 /* Packet is being returned to sender */
27#define DN_RT_F_RQR 0x08 /* Return packet to sender upon non-delivery */
28
29/* Mask for types of routing packets */
30#define DN_RT_PKT_MSK 0x06
31/* Types of routing packets */
32#define DN_RT_PKT_SHORT 0x02 /* Short routing packet */
33#define DN_RT_PKT_LONG 0x06 /* Long routing packet */
34
35/* Mask for control/routing selection */
36#define DN_RT_PKT_CNTL 0x01 /* Set to 1 if a control packet */
37/* Types of control packets */
38#define DN_RT_CNTL_MSK 0x0f /* Mask for control packets */
39#define DN_RT_PKT_INIT 0x01 /* Initialisation packet */
40#define DN_RT_PKT_VERI 0x03 /* Verification Message */
41#define DN_RT_PKT_HELO 0x05 /* Hello and Test Message */
42#define DN_RT_PKT_L1RT 0x07 /* Level 1 Routing Message */
43#define DN_RT_PKT_L2RT 0x09 /* Level 2 Routing Message */
44#define DN_RT_PKT_ERTH 0x0b /* Ethernet Router Hello */
45#define DN_RT_PKT_EEDH 0x0d /* Ethernet EndNode Hello */
46
47/* Values for info field in hello message */
48#define DN_RT_INFO_TYPE 0x03 /* Type mask */
49#define DN_RT_INFO_L1RT 0x02 /* L1 Router */
50#define DN_RT_INFO_L2RT 0x01 /* L2 Router */
51#define DN_RT_INFO_ENDN 0x03 /* EndNode */
52#define DN_RT_INFO_VERI 0x04 /* Verification Reqd. */
53#define DN_RT_INFO_RJCT 0x08 /* Reject Flag, Reserved */
54#define DN_RT_INFO_VFLD 0x10 /* Verification Failed, Reserved */
55#define DN_RT_INFO_NOML 0x20 /* No Multicast traffic accepted */
56#define DN_RT_INFO_BLKR 0x40 /* Blocking Requested */
57
58/*
59 * The fl structure is what we used to look up the route.
60 * The rt_saddr & rt_daddr entries are the same as key.saddr & key.daddr
61 * except for local input routes, where the rt_saddr = fl.fld_dst and
62 * rt_daddr = fl.fld_src to allow the route to be used for returning
63 * packets to the originating host.
64 */
65struct dn_route {
66 struct dst_entry dst;
67 struct dn_route __rcu *dn_next;
68
69 struct neighbour *n;
70
71 struct flowidn fld;
72
73 __le16 rt_saddr;
74 __le16 rt_daddr;
75 __le16 rt_gateway;
76 __le16 rt_local_src; /* Source used for forwarding packets */
77 __le16 rt_src_map;
78 __le16 rt_dst_map;
79
80 unsigned int rt_flags;
81 unsigned int rt_type;
82};
83
84static inline bool dn_is_input_route(struct dn_route *rt)
85{
86 return rt->fld.flowidn_iif != 0;
87}
88
89static inline bool dn_is_output_route(struct dn_route *rt)
90{
91 return rt->fld.flowidn_iif == 0;
92}
93
94void dn_route_init(void);
95void dn_route_cleanup(void);
96
97#include <net/sock.h>
98#include <linux/if_arp.h>
99
100static inline void dn_rt_send(struct sk_buff *skb)
101{
102 dev_queue_xmit(skb);
103}
104
105static inline void dn_rt_finish_output(struct sk_buff *skb, char *dst, char *src)
106{
107 struct net_device *dev = skb->dev;
108
109 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
110 dst = NULL;
111
112 if (dev_hard_header(skb, dev, ETH_P_DNA_RT, dst, src, skb->len) >= 0)
113 dn_rt_send(skb);
114 else
115 kfree_skb(skb);
116}
117
118#endif /* _NET_DN_ROUTE_H */