1 /*
2 * Copyright (c) 2010 Hudson River Trading LLC
3 * Written by George Neville-Neil gnn@freebsd.org
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * Description: The following is a test of the arp entry packet queues
28 * which replaced the single packet hold entry that existed in the BSDs
29 * since time immemorial. The test process is:
30 *
31 * 1) Find out the current system limit (maxhold)
32 * 2) Using an IP address for which we do not yet have an entry
33 * load up an ARP entry packet queue with exactly that many packets.
34 * 3) Check the arp dropped stat to make sure that we have not dropped
35 * any packets as yet.
36 * 4) Add one more packet to the queue.
37 * 5) Make sure that only one packet was dropped.
38 *
39 * CAVEAT: The ARP timer will flush the queue after 1 second so it is
40 * important not to run this code in a fast loop or the test will
41 * fail.
42 */
43
44 #include <unistd.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <string.h>
48 #include <sys/types.h>
49 #include <sys/sysctl.h>
50 #include <sys/socket.h>
51 #include <netinet/in.h>
52 #include <arpa/inet.h>
53 #include <net/if_arp.h>
54
55 #define MSG_SIZE 1024
56 #define PORT 6969
57
58 int
main(int argc,char ** argv)59 main(int argc, char **argv)
60 {
61
62 int sock;
63 int maxhold;
64 size_t size = sizeof(maxhold);
65 struct sockaddr_in dest;
66 char message[MSG_SIZE];
67 struct arpstat arpstat;
68 size_t len = sizeof(arpstat);
69 unsigned long dropped = 0;
70
71 memset(&message, 1, sizeof(message));
72
73 if (sysctlbyname("net.link.ether.inet.maxhold", &maxhold, &size,
74 NULL, 0) < 0) {
75 perror("not ok 1 - sysctlbyname failed");
76 exit(1);
77 }
78
79 #ifdef DEBUG
80 printf("maxhold is %d\n", maxhold);
81 #endif /* DEBUG */
82
83 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
84 perror("not ok 1 - could not open socket");
85 exit(1);
86 }
87
88 bzero(&dest, sizeof(dest));
89 if (inet_pton(AF_INET, argv[1], &dest.sin_addr.s_addr) != 1) {
90 perror("not ok 1 - could not parse address");
91 exit(1);
92 }
93 dest.sin_len = sizeof(dest);
94 dest.sin_family = AF_INET;
95 dest.sin_port = htons(PORT);
96
97 if (sysctlbyname("net.link.ether.arp.stats", &arpstat, &len,
98 NULL, 0) < 0) {
99 perror("not ok 1 - could not get initial arp stats");
100 exit(1);
101 }
102
103 dropped = arpstat.dropped;
104 #ifdef DEBUG
105 printf("dropped before %ld\n", dropped);
106 #endif /* DEBUG */
107
108 /*
109 * Load up the queue in the ARP entry to the maximum.
110 * We should not drop any packets at this point.
111 */
112
113 while (maxhold > 0) {
114 if (sendto(sock, message, sizeof(message), 0,
115 (struct sockaddr *)&dest, sizeof(dest)) < 0) {
116 perror("not ok 1 - could not send packet");
117 exit(1);
118 }
119 maxhold--;
120 }
121
122 if (sysctlbyname("net.link.ether.arp.stats", &arpstat, &len,
123 NULL, 0) < 0) {
124 perror("not ok 1 - could not get new arp stats");
125 exit(1);
126 }
127
128 #ifdef DEBUG
129 printf("dropped after %ld\n", arpstat.dropped);
130 #endif /* DEBUG */
131
132 if (arpstat.dropped != dropped) {
133 printf("not ok 1 - Failed, drops changed:"
134 "before %ld after %ld\n", dropped, arpstat.dropped);
135 exit(1);
136 }
137
138 dropped = arpstat.dropped;
139
140 /* Now add one extra and make sure it is dropped. */
141 if (sendto(sock, message, sizeof(message), 0,
142 (struct sockaddr *)&dest, sizeof(dest)) < 0) {
143 perror("not ok 1 - could not send packet");
144 exit(1);
145 }
146
147 if (sysctlbyname("net.link.ether.arp.stats", &arpstat, &len,
148 NULL, 0) < 0) {
149 perror("not ok 1 - could not get new arp stats");
150 exit(1);
151 }
152
153 if (arpstat.dropped != (dropped + 1)) {
154 printf("not ok 1 - Failed to drop one packet: before"
155 " %ld after %ld\n", dropped, arpstat.dropped);
156 exit(1);
157 }
158
159 printf("ok\n");
160 return (0);
161 }
162