File: /usr/src/linux/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 extern struct sk_buff *dn_alloc_skb(struct sock *sk, int size, int pri);
19 extern int dn_route_output(struct dst_entry **pprt, dn_address dst, dn_address src, int flags);
20 extern int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
21 extern int dn_cache_getroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
22 extern void dn_rt_cache_flush(int delay);
23
24 /* Masks for flags field */
25 #define DN_RT_F_PID 0x07 /* Mask for packet type */
26 #define DN_RT_F_PF 0x80 /* Padding Follows */
27 #define DN_RT_F_VER 0x40 /* Version =0 discard packet if ==1 */
28 #define DN_RT_F_IE 0x20 /* Intra Ethernet, Reserved in short pkt */
29 #define DN_RT_F_RTS 0x10 /* Packet is being returned to sender */
30 #define DN_RT_F_RQR 0x08 /* Return packet to sender upon non-delivery */
31
32 /* Mask for types of routing packets */
33 #define DN_RT_PKT_MSK 0x06
34 /* Types of routing packets */
35 #define DN_RT_PKT_SHORT 0x02 /* Short routing packet */
36 #define DN_RT_PKT_LONG 0x06 /* Long routing packet */
37
38 /* Mask for control/routing selection */
39 #define DN_RT_PKT_CNTL 0x01 /* Set to 1 if a control packet */
40 /* Types of control packets */
41 #define DN_RT_CNTL_MSK 0x0f /* Mask for control packets */
42 #define DN_RT_PKT_INIT 0x01 /* Initialisation packet */
43 #define DN_RT_PKT_VERI 0x03 /* Verification Message */
44 #define DN_RT_PKT_HELO 0x05 /* Hello and Test Message */
45 #define DN_RT_PKT_L1RT 0x07 /* Level 1 Routing Message */
46 #define DN_RT_PKT_L2RT 0x09 /* Level 2 Routing Message */
47 #define DN_RT_PKT_ERTH 0x0b /* Ethernet Router Hello */
48 #define DN_RT_PKT_EEDH 0x0d /* Ethernet EndNode Hello */
49
50 /* Values for info field in hello message */
51 #define DN_RT_INFO_TYPE 0x03 /* Type mask */
52 #define DN_RT_INFO_L1RT 0x02 /* L1 Router */
53 #define DN_RT_INFO_L2RT 0x01 /* L2 Router */
54 #define DN_RT_INFO_ENDN 0x03 /* EndNode */
55 #define DN_RT_INFO_VERI 0x04 /* Verification Reqd. */
56 #define DN_RT_INFO_RJCT 0x08 /* Reject Flag, Reserved */
57 #define DN_RT_INFO_VFLD 0x10 /* Verification Failed, Reserved */
58 #define DN_RT_INFO_NOML 0x20 /* No Multicast traffic accepted */
59 #define DN_RT_INFO_BLKR 0x40 /* Blocking Requested */
60
61 /*
62 * The key structure is what we used to look up the route.
63 * The rt_saddr & rt_daddr entries are the same as key.saddr & key.daddr
64 * except for local input routes, where the rt_saddr = key.daddr and
65 * rt_daddr = key.saddr to allow the route to be used for returning
66 * packets to the originating host.
67 */
68 struct dn_route {
69 union {
70 struct dst_entry dst;
71 struct dn_route *rt_next;
72 } u;
73 struct {
74 unsigned short saddr;
75 unsigned short daddr;
76 int iif;
77 int oif;
78 u32 fwmark;
79 } key;
80 unsigned short rt_saddr;
81 unsigned short rt_daddr;
82 unsigned char rt_type;
83 unsigned char rt_scope;
84 unsigned char rt_protocol;
85 unsigned char rt_table;
86 };
87
88 extern void dn_route_init(void);
89 extern void dn_route_cleanup(void);
90
91 #include <net/sock.h>
92 #include <linux/if_arp.h>
93
94 static inline void dn_rt_send(struct sk_buff *skb)
95 {
96 dev_queue_xmit(skb);
97 }
98
99 static inline void dn_rt_finish_output(struct sk_buff *skb, char *dst)
100 {
101 struct net_device *dev = skb->dev;
102
103 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
104 dst = NULL;
105
106 if (!dev->hard_header || (dev->hard_header(skb, dev, ETH_P_DNA_RT,
107 dst, NULL, skb->len) >= 0))
108 dn_rt_send(skb);
109 else
110 kfree_skb(skb);
111 }
112
113 static inline void dn_nsp_send(struct sk_buff *skb)
114 {
115 struct sock *sk = skb->sk;
116 struct dn_scp *scp = &sk->protinfo.dn;
117 struct dst_entry *dst;
118
119 skb->h.raw = skb->data;
120 scp->stamp = jiffies;
121
122 if ((dst = sk->dst_cache) && !dst->obsolete) {
123 try_again:
124 skb->dst = dst_clone(dst);
125 dst->output(skb);
126 return;
127 }
128
129 dst_release(xchg(&sk->dst_cache, NULL));
130
131 if (dn_route_output(&sk->dst_cache, dn_saddr2dn(&scp->peer), dn_saddr2dn(&scp->addr), 0) == 0) {
132 dst = sk->dst_cache;
133 goto try_again;
134 }
135
136 sk->err = EHOSTUNREACH;
137 if (!sk->dead)
138 sk->state_change(sk);
139 }
140
141 #endif /* _NET_DN_ROUTE_H */
142