2 * Copyright 2013 Google Inc.
3 * Author: Willem de Bruijn (willemb@google.com)
5 * A basic test of packet socket fanout behavior.
8 * - create fanout fails as expected with illegal flag combinations
9 * - join fanout fails as expected with diverging types or flags
12 * Open a pair of packet sockets and a pair of INET sockets, send a known
13 * number of packets across the two INET sockets and count the number of
14 * packets enqueued onto the two packet sockets.
16 * The test currently runs for
17 * - PACKET_FANOUT_HASH
18 * - PACKET_FANOUT_HASH with PACKET_FANOUT_FLAG_ROLLOVER
19 * - PACKET_FANOUT_ROLLOVER
22 * - datapath: PACKET_FANOUT_LB
23 * - datapath: PACKET_FANOUT_CPU
24 * - functionality: PACKET_FANOUT_FLAG_DEFRAG
28 * This program is free software; you can redistribute it and/or modify it
29 * under the terms and conditions of the GNU General Public License,
30 * version 2, as published by the Free Software Foundation.
32 * This program is distributed in the hope it will be useful, but WITHOUT
33 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
34 * FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for
37 * You should have received a copy of the GNU General Public License along with
38 * this program; if not, write to the Free Software Foundation, Inc.,
39 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
42 #include <arpa/inet.h>
44 #include <linux/filter.h>
45 #include <linux/if_packet.h>
46 #include <net/ethernet.h>
47 #include <netinet/ip.h>
48 #include <netinet/udp.h>
54 #include <sys/socket.h>
56 #include <sys/types.h>
59 /* Hack: build even if local includes are old */
61 #define PACKET_FANOUT 18
62 #define PACKET_FANOUT_HASH 0
63 #define PACKET_FANOUT_LB 1
64 #define PACKET_FANOUT_CPU 2
65 #define PACKET_FANOUT_FLAG_DEFRAG 0x8000
67 #ifndef PACKET_FANOUT_ROLLOVER
68 #define PACKET_FANOUT_ROLLOVER 3
71 #ifndef PACKET_FANOUT_FLAG_ROLLOVER
72 #define PACKET_FANOUT_FLAG_ROLLOVER 0x1000
80 static void pair_udp_open(int fds[], uint16_t port)
82 struct sockaddr_in saddr, daddr;
84 fds[0] = socket(PF_INET, SOCK_DGRAM, 0);
85 fds[1] = socket(PF_INET, SOCK_DGRAM, 0);
86 if (fds[0] == -1 || fds[1] == -1) {
87 fprintf(stderr, "ERROR: socket dgram\n");
91 memset(&saddr, 0, sizeof(saddr));
92 saddr.sin_family = AF_INET;
93 saddr.sin_port = htons(port);
94 saddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
96 memset(&daddr, 0, sizeof(daddr));
97 daddr.sin_family = AF_INET;
98 daddr.sin_port = htons(port + 1);
99 daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
101 /* must bind both to get consistent hash result */
102 if (bind(fds[1], (void *) &daddr, sizeof(daddr))) {
106 if (bind(fds[0], (void *) &saddr, sizeof(saddr))) {
110 if (connect(fds[0], (void *) &daddr, sizeof(daddr))) {
116 static void pair_udp_send(int fds[], int num)
118 char buf[DATA_LEN], rbuf[DATA_LEN];
120 memset(buf, DATA_CHAR, sizeof(buf));
122 /* Should really handle EINTR and EAGAIN */
123 if (write(fds[0], buf, sizeof(buf)) != sizeof(buf)) {
124 fprintf(stderr, "ERROR: send failed left=%d\n", num);
127 if (read(fds[1], rbuf, sizeof(rbuf)) != sizeof(rbuf)) {
128 fprintf(stderr, "ERROR: recv failed left=%d\n", num);
131 if (memcmp(buf, rbuf, sizeof(buf))) {
132 fprintf(stderr, "ERROR: data failed left=%d\n", num);
138 static void sock_fanout_setfilter(int fd)
140 struct sock_filter bpf_filter[] = {
141 { 0x80, 0, 0, 0x00000000 }, /* LD pktlen */
142 { 0x35, 0, 5, DATA_LEN }, /* JGE DATA_LEN [f goto nomatch]*/
143 { 0x30, 0, 0, 0x00000050 }, /* LD ip[80] */
144 { 0x15, 0, 3, DATA_CHAR }, /* JEQ DATA_CHAR [f goto nomatch]*/
145 { 0x30, 0, 0, 0x00000051 }, /* LD ip[81] */
146 { 0x15, 0, 1, DATA_CHAR }, /* JEQ DATA_CHAR [f goto nomatch]*/
147 { 0x6, 0, 0, 0x00000060 }, /* RET match */
148 /* nomatch */ { 0x6, 0, 0, 0x00000000 }, /* RET no match */
150 struct sock_fprog bpf_prog;
152 bpf_prog.filter = bpf_filter;
153 bpf_prog.len = sizeof(bpf_filter) / sizeof(struct sock_filter);
154 if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &bpf_prog,
156 perror("setsockopt SO_ATTACH_FILTER");
161 /* Open a socket in a given fanout mode.
162 * @return -1 if mode is bad, a valid socket otherwise */
163 static int sock_fanout_open(uint16_t typeflags, int num_packets)
167 fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
169 perror("socket packet");
173 /* fanout group ID is always 0: tests whether old groups are deleted */
174 val = ((int) typeflags) << 16;
175 if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &val, sizeof(val))) {
177 perror("close packet");
183 val = sizeof(struct iphdr) + sizeof(struct udphdr) + DATA_LEN;
185 /* hack: apparently, the above calculation is too small (TODO: fix) */
187 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val))) {
188 perror("setsockopt SO_RCVBUF");
192 sock_fanout_setfilter(fd);
196 static void sock_fanout_read(int fds[], const int expect[])
198 struct tpacket_stats stats;
202 ssize = sizeof(stats);
203 if (getsockopt(fds[0], SOL_PACKET, PACKET_STATISTICS, &stats, &ssize)) {
204 perror("getsockopt statistics 0");
207 ret[0] = stats.tp_packets - stats.tp_drops;
208 ssize = sizeof(stats);
209 if (getsockopt(fds[1], SOL_PACKET, PACKET_STATISTICS, &stats, &ssize)) {
210 perror("getsockopt statistics 1");
213 ret[1] = stats.tp_packets - stats.tp_drops;
215 fprintf(stderr, "info: count=%d,%d, expect=%d,%d\n",
216 ret[0], ret[1], expect[0], expect[1]);
218 if ((!(ret[0] == expect[0] && ret[1] == expect[1])) &&
219 (!(ret[0] == expect[1] && ret[1] == expect[0]))) {
220 fprintf(stderr, "ERROR: incorrect queue lengths\n");
225 /* Test illegal mode + flag combination */
226 static void test_control_single(void)
228 fprintf(stderr, "test: control single socket\n");
230 if (sock_fanout_open(PACKET_FANOUT_ROLLOVER |
231 PACKET_FANOUT_FLAG_ROLLOVER, 0) != -1) {
232 fprintf(stderr, "ERROR: opened socket with dual rollover\n");
237 /* Test illegal group with different modes or flags */
238 static void test_control_group(void)
242 fprintf(stderr, "test: control multiple sockets\n");
244 fds[0] = sock_fanout_open(PACKET_FANOUT_HASH, 20);
246 fprintf(stderr, "ERROR: failed to open HASH socket\n");
249 if (sock_fanout_open(PACKET_FANOUT_HASH |
250 PACKET_FANOUT_FLAG_DEFRAG, 10) != -1) {
251 fprintf(stderr, "ERROR: joined group with wrong flag defrag\n");
254 if (sock_fanout_open(PACKET_FANOUT_HASH |
255 PACKET_FANOUT_FLAG_ROLLOVER, 10) != -1) {
256 fprintf(stderr, "ERROR: joined group with wrong flag ro\n");
259 if (sock_fanout_open(PACKET_FANOUT_CPU, 10) != -1) {
260 fprintf(stderr, "ERROR: joined group with wrong mode\n");
263 fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, 20);
265 fprintf(stderr, "ERROR: failed to join group\n");
268 if (close(fds[1]) || close(fds[0])) {
269 fprintf(stderr, "ERROR: closing sockets\n");
274 static void test_datapath(uint16_t typeflags,
275 const int expect1[], const int expect2[])
277 const int expect0[] = { 0, 0 };
278 int fds[2], fds_udp[2][2];
280 fprintf(stderr, "test: datapath 0x%hx\n", typeflags);
282 fds[0] = sock_fanout_open(typeflags, 20);
283 fds[1] = sock_fanout_open(typeflags, 20);
284 if (fds[0] == -1 || fds[1] == -1) {
285 fprintf(stderr, "ERROR: failed open\n");
288 pair_udp_open(fds_udp[0], 8000);
289 pair_udp_open(fds_udp[1], 8002);
290 sock_fanout_read(fds, expect0);
292 /* Send data, but not enough to overflow a queue */
293 pair_udp_send(fds_udp[0], 15);
294 pair_udp_send(fds_udp[1], 5);
295 sock_fanout_read(fds, expect1);
297 /* Send more data, overflow the queue */
298 pair_udp_send(fds_udp[0], 15);
299 /* TODO: ensure consistent order between expect1 and expect2 */
300 sock_fanout_read(fds, expect2);
302 if (close(fds_udp[1][1]) || close(fds_udp[1][0]) ||
303 close(fds_udp[0][1]) || close(fds_udp[0][0]) ||
304 close(fds[1]) || close(fds[0])) {
305 fprintf(stderr, "close datapath\n");
310 int main(int argc, char **argv)
312 const int expect_hash[2][2] = { { 15, 5 }, { 5, 0 } };
313 const int expect_hash_rb[2][2] = { { 15, 5 }, { 5, 10 } };
314 const int expect_rb[2][2] = { { 20, 0 }, { 0, 15 } };
316 test_control_single();
317 test_control_group();
319 test_datapath(PACKET_FANOUT_HASH, expect_hash[0], expect_hash[1]);
320 test_datapath(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_ROLLOVER,
321 expect_hash_rb[0], expect_hash_rb[1]);
322 test_datapath(PACKET_FANOUT_ROLLOVER, expect_rb[0], expect_rb[1]);
324 printf("OK. All tests passed\n");