1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
/*
* send_route.c DECnet routing daemon
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Patrick Caulfield <patrick@debian.org>
*
*/
#include <sys/types.h>
#include <linux/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
#include <assert.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <string.h>
#include <linux/netfilter_decnet.h>
#include <netdnet/dnetdb.h>
#include <features.h> /* for the glibc version number */
#if (__GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || __GLIBC__ >= 3
#include <netpacket/packet.h>
#include <net/ethernet.h> /* the L2 protocols */
#include <net/if.h>
#include <net/if_arp.h>
#else
#include <asm/types.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/if_packet.h>
#include <linux/if_ether.h> /* The L2 protocols */
#endif
#include "utils.h"
#include "libnetlink.h"
#include "dnrtlink.h"
#include "csum.h"
#include "dnroute.h"
extern char *if_index_to_name(int ifindex);
extern int dnet_socket;
/* Send a Level 1 routing message for nodes "start" to "end".
* "start" should be a multiple of 32 for the header to be
* added correctly/
*/
static int send_routing_message(unsigned char type, struct routeinfo *node_table, int start, int end,
struct dn_naddr *exec, int interface)
{
struct sockaddr_ll sock_info;
unsigned char packet[1600];
unsigned short sum;
int i,j;
fprintf(stderr,"Sending message type %d. start=%d, end=%d\n", type,start,end);
i=0;
packet[i++] = 0x00; /* Length, filled in at end */
packet[i++] = 0x00;
packet[i++] = type;
packet[i++] = exec->a_addr[0]; /* Our node address */
packet[i++] = exec->a_addr[1];
packet[i++] = 0x00; /* Reserved */
/* Header */
packet[i++] = (end-start) & 0xFF;
packet[i++] = (end-start) >> 8;
packet[i++] = start & 0xFF;
packet[i++] = start >> 8;
for (j=start; j<end; j++)
{
if (node_table[j].valid)
{
packet[i++] = node_table[j].cost; /* cost can use the low 2 bit of the next byte... */
packet[i++] = (node_table[j].hops << 2) | ((node_table[j].cost>>8) & 3); /* hops - starting bit 2 */
}
else
{
packet[i++] = 0xff;
packet[i++] = 0x7f;
}
}
/* Add in checksum */
sum = route_csum(packet, 6, i);
packet[i++] = sum & 0xFF;
packet[i++] = sum >> 8;
packet[0] = (i-2) & 0xFF;
packet[1] = (i-2) >> 8;
/* Build the sockaddr_ll structure */
sock_info.sll_family = AF_PACKET;
sock_info.sll_protocol = htons(ETH_P_DNA_RT);
sock_info.sll_ifindex = interface;
sock_info.sll_hatype = 0;
sock_info.sll_pkttype = PACKET_MULTICAST;
sock_info.sll_halen = 6;
/* This is the DECnet routing multicast address */
sock_info.sll_addr[0] = 0xab;
sock_info.sll_addr[1] = 0x00;
sock_info.sll_addr[2] = 0x00;
sock_info.sll_addr[3] = 0x03;
sock_info.sll_addr[4] = 0x00;
sock_info.sll_addr[5] = 0x00;
if (sendto(dnet_socket, packet, i, 0,
(struct sockaddr *)&sock_info, sizeof(sock_info)) < 0)
{
perror("sendto");
return -1;
}
return 0;
}
static void send_route_msg(unsigned char type, struct routeinfo *node_table, int start, int num)
{
struct ifreq ifr;
int iindex = 1;
struct dn_naddr *addr;
int last_node;
int sock;
sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sock < 0)
return;
/* Get our node address */
addr = getnodeadd();
for (iindex = 0; iindex < 128; iindex++)
{
ifr.ifr_ifindex = iindex;
if (ioctl(sock, SIOCGIFNAME, &ifr) == 0)
{
/* Only send to ethernet interfaces */
ioctl(sock, SIOCGIFHWADDR, &ifr);
if (ifr.ifr_hwaddr.sa_family == ARPHRD_ETHER)
{
int mtu;
int num_nodes;
last_node = start;
ioctl(sock, SIOCGIFMTU, &ifr);
mtu = ifr.ifr_mtu;
/* Work out how many blocks we get into one MTU-sized packet */
/* header = 32 bytes, 2 bytes per node, in multiples of 32 nodes */
num_nodes = (mtu-32)/2 & 0xFFC0;
if (num_nodes > 256) num_nodes = 256; /* cap it */
while (last_node < num)
{
/* Don't overflow the end of the list */
if (last_node+num_nodes > num)
num_nodes = num-last_node;
send_routing_message(type, node_table, last_node, last_node+num_nodes, addr, iindex);
last_node += num_nodes;
}
}
ifr.ifr_ifindex = iindex;
}
}
close(sock);
return;
}
void send_level1_msg(struct routeinfo *node_table)
{
send_route_msg(0x07, node_table, 0, 1024);
}
void send_level2_msg(struct routeinfo *area_table)
{
send_route_msg(0x09, area_table, 1, 64);
}
|
