1 /*
2 * Copyright 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *
16 * clatd_microbenchmark.c - micro-benchmark for clatd tun send path
17 *
18 * Run with:
19 *
20 * adb push {$ANDROID_PRODUCT_OUT,}/data/nativetest/clatd_microbenchmark/clatd_microbenchmark
21 * adb shell /data/nativetest/clatd_microbenchmark/clatd_microbenchmark
22 *
23 */
24 #include <errno.h>
25 #include <fcntl.h>
26 #include <string.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <time.h>
30 #include <unistd.h>
31 #include <sys/ioctl.h>
32 #include <sys/socket.h>
33 #include <sys/stat.h>
34 #include <sys/types.h>
35 #include <sys/uio.h>
36 #include <netinet/in.h>
37 #include <netinet/ip.h>
38 #include <netinet/ip6.h>
39 #include <netinet/udp.h>
40 #include <arpa/inet.h>
41 #include <linux/if.h>
42 #include <linux/if_tun.h>
43
44 #include "checksum.h"
45 #include "tun.h"
46
47 #define DEVICENAME "clat4"
48
49 #define PORT 51339
50 #define PAYLOADSIZE (1280 - sizeof(struct iphdr) - sizeof(struct udphdr))
51 #define NUMPACKETS 1000000
52 #define SEC_TO_NANOSEC (1000 * 1000 * 1000)
53
init_sockaddr_in(struct sockaddr_in * sin,const char * addr)54 void init_sockaddr_in(struct sockaddr_in *sin, const char *addr) {
55 sin->sin_family = AF_INET;
56 sin->sin_port = 0;
57 sin->sin_addr.s_addr = inet_addr(addr);
58 }
59
die(const char * str)60 void die(const char *str) {
61 perror(str);
62 exit(1);
63 }
64
setup_tun()65 int setup_tun() {
66 int fd = tun_open();
67 if (fd == -1) die("tun_open");
68
69 char dev[IFNAMSIZ] = DEVICENAME;
70 int ret = tun_alloc(dev, fd);
71 if (ret == -1) die("tun_alloc");
72 struct ifreq ifr = {
73 .ifr_name = DEVICENAME,
74 };
75
76 int s = socket(AF_INET, SOCK_DGRAM, 0);
77 init_sockaddr_in((struct sockaddr_in *) &ifr.ifr_addr, "192.0.0.4");
78 if (ioctl(s, SIOCSIFADDR, &ifr) < 0) die("SIOCSIFADDR");
79 init_sockaddr_in((struct sockaddr_in *) &ifr.ifr_addr, "255.255.255.248");
80 if (ioctl(s, SIOCSIFNETMASK, &ifr) < 0) die("SIOCSIFNETMASK");
81 if (ioctl(s, SIOCGIFFLAGS, &ifr) < 0) die("SIOCGIFFLAGS");
82 ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
83 if (ioctl(s, SIOCSIFFLAGS, &ifr) < 0) die("SIOCSIFFLAGS");
84 return fd;
85 }
86
send_packet(int fd,uint8_t payload[],int len,uint32_t payload_checksum)87 int send_packet(int fd, uint8_t payload[], int len, uint32_t payload_checksum) {
88 struct tun_pi tun = { 0, htons(ETH_P_IP) };
89 struct udphdr udp = {
90 .source = htons(1234),
91 .dest = htons(PORT),
92 .len = htons(len + sizeof(udp)),
93 .check = 0,
94 };
95 struct iphdr ip = {
96 .version = 4,
97 .ihl = 5,
98 .tot_len = htons(len + sizeof(ip) + sizeof(udp)),
99 .frag_off = htons(IP_DF),
100 .ttl = 55,
101 .protocol = IPPROTO_UDP,
102 .saddr = htonl(0xc0000006), // 192.0.0.6
103 .daddr = htonl(0xc0000004), // 192.0.0.4
104 };
105 clat_packet out = {
106 { &tun, sizeof(tun) }, // tun header
107 { &ip, sizeof(ip) }, // IP header
108 { NULL, 0 }, // Fragment header
109 { &udp, sizeof(udp) }, // Transport header
110 { NULL, 0 }, // ICMP error IP header
111 { NULL, 0 }, // ICMP error fragment header
112 { NULL, 0 }, // ICMP error transport header
113 { payload, len }, // Payload
114 };
115
116 ip.check = ip_checksum(&ip, sizeof(ip));
117
118 uint32_t sum;
119 sum = ipv4_pseudo_header_checksum(&ip, ntohs(udp.len));
120 sum = ip_checksum_add(sum, &udp, sizeof(udp));
121 sum += payload_checksum;
122 udp.check = ip_checksum_finish(sum);
123
124 return send_tun(fd, out, sizeof(out) / sizeof(out[0]));
125 }
126
timedelta(const struct timespec tv1,const struct timespec tv2)127 double timedelta(const struct timespec tv1, const struct timespec tv2) {
128 struct timespec end = tv2;
129 if (end.tv_nsec < tv1.tv_nsec) {
130 end.tv_sec -= 1;
131 end.tv_nsec += SEC_TO_NANOSEC;
132 }
133 double seconds = (end.tv_sec - tv1.tv_sec);
134 seconds += (((double) (end.tv_nsec - tv1.tv_nsec)) / SEC_TO_NANOSEC);
135 return seconds;
136 }
137
benchmark(const char * name,int fd,int s,int num,int do_read,uint8_t payload[],int len,uint32_t payload_sum)138 void benchmark(const char *name, int fd, int s, int num, int do_read,
139 uint8_t payload[], int len, uint32_t payload_sum) {
140 int i;
141 char buf[4096];
142 struct timespec tv1, tv2;
143 int write_err = 0, read_err = 0;
144 clock_gettime(CLOCK_MONOTONIC, &tv1);
145 for (i = 0; i < num; i++) {
146 if (send_packet(fd, payload, len, payload_sum) == -1) write_err++;
147 if (do_read && recvfrom(s, buf, sizeof(buf), 0, NULL, NULL) == -1) {
148 read_err++;
149 if (errno == ETIMEDOUT) {
150 printf("Timed out after %d packets!\n", i);
151 break;
152 }
153 }
154 }
155 clock_gettime(CLOCK_MONOTONIC, &tv2);
156 double seconds = timedelta(tv1, tv2);
157 int pps = (int) (i / seconds);
158 double mbps = (i * PAYLOADSIZE / 1000000 * 8 / seconds);
159 printf("%s: %d packets in %.2fs (%d pps, %.2f Mbps), ", name, i, seconds, pps, mbps);
160 printf("read err %d (%.2f%%), write err %d (%.2f%%)\n",
161 read_err, (float) read_err / i * 100,
162 write_err, (float) write_err / i * 100);
163 }
164
open_socket()165 int open_socket() {
166 int sock = socket(AF_INET, SOCK_DGRAM | SOCK_NONBLOCK, IPPROTO_UDP);
167
168 int on = 1;
169 if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) die("SO_REUSEADDR");
170
171 struct timeval tv = { 1, 0 };
172 if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) == -1) die("SO_RCVTIMEO");
173
174 struct sockaddr_in addr = {
175 .sin_family = AF_INET,
176 .sin_port = ntohs(PORT),
177 .sin_addr = { INADDR_ANY }
178 };
179 if (bind(sock, (struct sockaddr *) &addr, sizeof(addr)) == -1) die ("bind");
180
181 return sock;
182 }
183
main()184 int main() {
185 int fd = setup_tun();
186 int sock = open_socket();
187
188 int i;
189 uint8_t payload[PAYLOADSIZE];
190 for (i = 0; i < (int) sizeof(payload); i++) {
191 payload[i] = (uint8_t) i;
192 }
193 uint32_t payload_sum = ip_checksum_add(0, payload, sizeof(payload));
194
195 // Check things are working.
196 char buf[4096];
197 if (send_packet(fd, payload, sizeof(payload), payload_sum) == -1) die("send_packet");
198 if (recvfrom(sock, buf, sizeof(buf), 0, NULL, NULL) == -1) die("recvfrom");
199
200 benchmark("Blocking", fd, sock, NUMPACKETS, 1, payload, sizeof(payload), payload_sum);
201 close(fd);
202
203 fd = setup_tun();
204 set_nonblocking(fd);
205 benchmark("No read", fd, sock, NUMPACKETS, 0, payload, sizeof(payload), payload_sum);
206 close(fd);
207
208 fd = setup_tun();
209 set_nonblocking(fd);
210 benchmark("Nonblocking", fd, sock, NUMPACKETS, 1, payload, sizeof(payload), payload_sum);
211 close(fd);
212
213 return 0;
214 }
215