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Linux/tools/testing/selftests/net/psock_fanout.c

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  1 /*
  2  * Copyright 2013 Google Inc.
  3  * Author: Willem de Bruijn (willemb@google.com)
  4  *
  5  * A basic test of packet socket fanout behavior.
  6  *
  7  * Control:
  8  * - create fanout fails as expected with illegal flag combinations
  9  * - join   fanout fails as expected with diverging types or flags
 10  *
 11  * Datapath:
 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.
 15  *
 16  *   The test currently runs for
 17  *   - PACKET_FANOUT_HASH
 18  *   - PACKET_FANOUT_HASH with PACKET_FANOUT_FLAG_ROLLOVER
 19  *   - PACKET_FANOUT_LB
 20  *   - PACKET_FANOUT_CPU
 21  *   - PACKET_FANOUT_ROLLOVER
 22  *   - PACKET_FANOUT_CBPF
 23  *   - PACKET_FANOUT_EBPF
 24  *
 25  * Todo:
 26  * - functionality: PACKET_FANOUT_FLAG_DEFRAG
 27  *
 28  * License (GPLv2):
 29  *
 30  * This program is free software; you can redistribute it and/or modify it
 31  * under the terms and conditions of the GNU General Public License,
 32  * version 2, as published by the Free Software Foundation.
 33  *
 34  * This program is distributed in the hope it will be useful, but WITHOUT
 35  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 36  * FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for
 37  * more details.
 38  *
 39  * You should have received a copy of the GNU General Public License along with
 40  * this program; if not, write to the Free Software Foundation, Inc.,
 41  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 42  */
 43 
 44 #define _GNU_SOURCE             /* for sched_setaffinity */
 45 
 46 #include <arpa/inet.h>
 47 #include <errno.h>
 48 #include <fcntl.h>
 49 #include <linux/unistd.h>       /* for __NR_bpf */
 50 #include <linux/filter.h>
 51 #include <linux/bpf.h>
 52 #include <linux/if_packet.h>
 53 #include <net/ethernet.h>
 54 #include <netinet/ip.h>
 55 #include <netinet/udp.h>
 56 #include <poll.h>
 57 #include <sched.h>
 58 #include <stdint.h>
 59 #include <stdio.h>
 60 #include <stdlib.h>
 61 #include <string.h>
 62 #include <sys/mman.h>
 63 #include <sys/socket.h>
 64 #include <sys/stat.h>
 65 #include <sys/types.h>
 66 #include <unistd.h>
 67 
 68 #include "psock_lib.h"
 69 
 70 #define RING_NUM_FRAMES                 20
 71 
 72 /* Open a socket in a given fanout mode.
 73  * @return -1 if mode is bad, a valid socket otherwise */
 74 static int sock_fanout_open(uint16_t typeflags, uint16_t group_id)
 75 {
 76         int fd, val;
 77 
 78         fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_IP));
 79         if (fd < 0) {
 80                 perror("socket packet");
 81                 exit(1);
 82         }
 83 
 84         val = (((int) typeflags) << 16) | group_id;
 85         if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &val, sizeof(val))) {
 86                 if (close(fd)) {
 87                         perror("close packet");
 88                         exit(1);
 89                 }
 90                 return -1;
 91         }
 92 
 93         pair_udp_setfilter(fd);
 94         return fd;
 95 }
 96 
 97 static void sock_fanout_set_cbpf(int fd)
 98 {
 99         struct sock_filter bpf_filter[] = {
100                 BPF_STMT(BPF_LD+BPF_B+BPF_ABS, 80),           /* ldb [80] */
101                 BPF_STMT(BPF_RET+BPF_A, 0),                   /* ret A */
102         };
103         struct sock_fprog bpf_prog;
104 
105         bpf_prog.filter = bpf_filter;
106         bpf_prog.len = sizeof(bpf_filter) / sizeof(struct sock_filter);
107 
108         if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT_DATA, &bpf_prog,
109                        sizeof(bpf_prog))) {
110                 perror("fanout data cbpf");
111                 exit(1);
112         }
113 }
114 
115 static void sock_fanout_getopts(int fd, uint16_t *typeflags, uint16_t *group_id)
116 {
117         int sockopt;
118         socklen_t sockopt_len = sizeof(sockopt);
119 
120         if (getsockopt(fd, SOL_PACKET, PACKET_FANOUT,
121                        &sockopt, &sockopt_len)) {
122                 perror("failed to getsockopt");
123                 exit(1);
124         }
125         *typeflags = sockopt >> 16;
126         *group_id = sockopt & 0xfffff;
127 }
128 
129 static void sock_fanout_set_ebpf(int fd)
130 {
131         const int len_off = __builtin_offsetof(struct __sk_buff, len);
132         struct bpf_insn prog[] = {
133                 { BPF_ALU64 | BPF_MOV | BPF_X,   6, 1, 0, 0 },
134                 { BPF_LDX   | BPF_W   | BPF_MEM, 0, 6, len_off, 0 },
135                 { BPF_JMP   | BPF_JGE | BPF_K,   0, 0, 1, DATA_LEN },
136                 { BPF_JMP   | BPF_JA  | BPF_K,   0, 0, 4, 0 },
137                 { BPF_LD    | BPF_B   | BPF_ABS, 0, 0, 0, 0x50 },
138                 { BPF_JMP   | BPF_JEQ | BPF_K,   0, 0, 2, DATA_CHAR },
139                 { BPF_JMP   | BPF_JEQ | BPF_K,   0, 0, 1, DATA_CHAR_1 },
140                 { BPF_ALU   | BPF_MOV | BPF_K,   0, 0, 0, 0 },
141                 { BPF_JMP   | BPF_EXIT,          0, 0, 0, 0 }
142         };
143         char log_buf[512];
144         union bpf_attr attr;
145         int pfd;
146 
147         memset(&attr, 0, sizeof(attr));
148         attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
149         attr.insns = (unsigned long) prog;
150         attr.insn_cnt = sizeof(prog) / sizeof(prog[0]);
151         attr.license = (unsigned long) "GPL";
152         attr.log_buf = (unsigned long) log_buf,
153         attr.log_size = sizeof(log_buf),
154         attr.log_level = 1,
155 
156         pfd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
157         if (pfd < 0) {
158                 perror("bpf");
159                 fprintf(stderr, "bpf verifier:\n%s\n", log_buf);
160                 exit(1);
161         }
162 
163         if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT_DATA, &pfd, sizeof(pfd))) {
164                 perror("fanout data ebpf");
165                 exit(1);
166         }
167 
168         if (close(pfd)) {
169                 perror("close ebpf");
170                 exit(1);
171         }
172 }
173 
174 static char *sock_fanout_open_ring(int fd)
175 {
176         struct tpacket_req req = {
177                 .tp_block_size = getpagesize(),
178                 .tp_frame_size = getpagesize(),
179                 .tp_block_nr   = RING_NUM_FRAMES,
180                 .tp_frame_nr   = RING_NUM_FRAMES,
181         };
182         char *ring;
183         int val = TPACKET_V2;
184 
185         if (setsockopt(fd, SOL_PACKET, PACKET_VERSION, (void *) &val,
186                        sizeof(val))) {
187                 perror("packetsock ring setsockopt version");
188                 exit(1);
189         }
190         if (setsockopt(fd, SOL_PACKET, PACKET_RX_RING, (void *) &req,
191                        sizeof(req))) {
192                 perror("packetsock ring setsockopt");
193                 exit(1);
194         }
195 
196         ring = mmap(0, req.tp_block_size * req.tp_block_nr,
197                     PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
198         if (ring == MAP_FAILED) {
199                 perror("packetsock ring mmap");
200                 exit(1);
201         }
202 
203         return ring;
204 }
205 
206 static int sock_fanout_read_ring(int fd, void *ring)
207 {
208         struct tpacket2_hdr *header = ring;
209         int count = 0;
210 
211         while (count < RING_NUM_FRAMES && header->tp_status & TP_STATUS_USER) {
212                 count++;
213                 header = ring + (count * getpagesize());
214         }
215 
216         return count;
217 }
218 
219 static int sock_fanout_read(int fds[], char *rings[], const int expect[])
220 {
221         int ret[2];
222 
223         ret[0] = sock_fanout_read_ring(fds[0], rings[0]);
224         ret[1] = sock_fanout_read_ring(fds[1], rings[1]);
225 
226         fprintf(stderr, "info: count=%d,%d, expect=%d,%d\n",
227                         ret[0], ret[1], expect[0], expect[1]);
228 
229         if ((!(ret[0] == expect[0] && ret[1] == expect[1])) &&
230             (!(ret[0] == expect[1] && ret[1] == expect[0]))) {
231                 fprintf(stderr, "ERROR: incorrect queue lengths\n");
232                 return 1;
233         }
234 
235         return 0;
236 }
237 
238 /* Test illegal mode + flag combination */
239 static void test_control_single(void)
240 {
241         fprintf(stderr, "test: control single socket\n");
242 
243         if (sock_fanout_open(PACKET_FANOUT_ROLLOVER |
244                                PACKET_FANOUT_FLAG_ROLLOVER, 0) != -1) {
245                 fprintf(stderr, "ERROR: opened socket with dual rollover\n");
246                 exit(1);
247         }
248 }
249 
250 /* Test illegal group with different modes or flags */
251 static void test_control_group(void)
252 {
253         int fds[2];
254 
255         fprintf(stderr, "test: control multiple sockets\n");
256 
257         fds[0] = sock_fanout_open(PACKET_FANOUT_HASH, 0);
258         if (fds[0] == -1) {
259                 fprintf(stderr, "ERROR: failed to open HASH socket\n");
260                 exit(1);
261         }
262         if (sock_fanout_open(PACKET_FANOUT_HASH |
263                                PACKET_FANOUT_FLAG_DEFRAG, 0) != -1) {
264                 fprintf(stderr, "ERROR: joined group with wrong flag defrag\n");
265                 exit(1);
266         }
267         if (sock_fanout_open(PACKET_FANOUT_HASH |
268                                PACKET_FANOUT_FLAG_ROLLOVER, 0) != -1) {
269                 fprintf(stderr, "ERROR: joined group with wrong flag ro\n");
270                 exit(1);
271         }
272         if (sock_fanout_open(PACKET_FANOUT_CPU, 0) != -1) {
273                 fprintf(stderr, "ERROR: joined group with wrong mode\n");
274                 exit(1);
275         }
276         fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, 0);
277         if (fds[1] == -1) {
278                 fprintf(stderr, "ERROR: failed to join group\n");
279                 exit(1);
280         }
281         if (close(fds[1]) || close(fds[0])) {
282                 fprintf(stderr, "ERROR: closing sockets\n");
283                 exit(1);
284         }
285 }
286 
287 /* Test creating a unique fanout group ids */
288 static void test_unique_fanout_group_ids(void)
289 {
290         int fds[3];
291         uint16_t typeflags, first_group_id, second_group_id;
292 
293         fprintf(stderr, "test: unique ids\n");
294 
295         fds[0] = sock_fanout_open(PACKET_FANOUT_HASH |
296                                   PACKET_FANOUT_FLAG_UNIQUEID, 0);
297         if (fds[0] == -1) {
298                 fprintf(stderr, "ERROR: failed to create a unique id group.\n");
299                 exit(1);
300         }
301 
302         sock_fanout_getopts(fds[0], &typeflags, &first_group_id);
303         if (typeflags != PACKET_FANOUT_HASH) {
304                 fprintf(stderr, "ERROR: unexpected typeflags %x\n", typeflags);
305                 exit(1);
306         }
307 
308         if (sock_fanout_open(PACKET_FANOUT_CPU, first_group_id) != -1) {
309                 fprintf(stderr, "ERROR: joined group with wrong type.\n");
310                 exit(1);
311         }
312 
313         fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, first_group_id);
314         if (fds[1] == -1) {
315                 fprintf(stderr,
316                         "ERROR: failed to join previously created group.\n");
317                 exit(1);
318         }
319 
320         fds[2] = sock_fanout_open(PACKET_FANOUT_HASH |
321                                   PACKET_FANOUT_FLAG_UNIQUEID, 0);
322         if (fds[2] == -1) {
323                 fprintf(stderr,
324                         "ERROR: failed to create a second unique id group.\n");
325                 exit(1);
326         }
327 
328         sock_fanout_getopts(fds[2], &typeflags, &second_group_id);
329         if (sock_fanout_open(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_UNIQUEID,
330                              second_group_id) != -1) {
331                 fprintf(stderr,
332                         "ERROR: specified a group id when requesting unique id\n");
333                 exit(1);
334         }
335 
336         if (close(fds[0]) || close(fds[1]) || close(fds[2])) {
337                 fprintf(stderr, "ERROR: closing sockets\n");
338                 exit(1);
339         }
340 }
341 
342 static int test_datapath(uint16_t typeflags, int port_off,
343                          const int expect1[], const int expect2[])
344 {
345         const int expect0[] = { 0, 0 };
346         char *rings[2];
347         uint8_t type = typeflags & 0xFF;
348         int fds[2], fds_udp[2][2], ret;
349 
350         fprintf(stderr, "test: datapath 0x%hx\n", typeflags);
351 
352         fds[0] = sock_fanout_open(typeflags, 0);
353         fds[1] = sock_fanout_open(typeflags, 0);
354         if (fds[0] == -1 || fds[1] == -1) {
355                 fprintf(stderr, "ERROR: failed open\n");
356                 exit(1);
357         }
358         if (type == PACKET_FANOUT_CBPF)
359                 sock_fanout_set_cbpf(fds[0]);
360         else if (type == PACKET_FANOUT_EBPF)
361                 sock_fanout_set_ebpf(fds[0]);
362 
363         rings[0] = sock_fanout_open_ring(fds[0]);
364         rings[1] = sock_fanout_open_ring(fds[1]);
365         pair_udp_open(fds_udp[0], PORT_BASE);
366         pair_udp_open(fds_udp[1], PORT_BASE + port_off);
367         sock_fanout_read(fds, rings, expect0);
368 
369         /* Send data, but not enough to overflow a queue */
370         pair_udp_send(fds_udp[0], 15);
371         pair_udp_send_char(fds_udp[1], 5, DATA_CHAR_1);
372         ret = sock_fanout_read(fds, rings, expect1);
373 
374         /* Send more data, overflow the queue */
375         pair_udp_send_char(fds_udp[0], 15, DATA_CHAR_1);
376         /* TODO: ensure consistent order between expect1 and expect2 */
377         ret |= sock_fanout_read(fds, rings, expect2);
378 
379         if (munmap(rings[1], RING_NUM_FRAMES * getpagesize()) ||
380             munmap(rings[0], RING_NUM_FRAMES * getpagesize())) {
381                 fprintf(stderr, "close rings\n");
382                 exit(1);
383         }
384         if (close(fds_udp[1][1]) || close(fds_udp[1][0]) ||
385             close(fds_udp[0][1]) || close(fds_udp[0][0]) ||
386             close(fds[1]) || close(fds[0])) {
387                 fprintf(stderr, "close datapath\n");
388                 exit(1);
389         }
390 
391         return ret;
392 }
393 
394 static int set_cpuaffinity(int cpuid)
395 {
396         cpu_set_t mask;
397 
398         CPU_ZERO(&mask);
399         CPU_SET(cpuid, &mask);
400         if (sched_setaffinity(0, sizeof(mask), &mask)) {
401                 if (errno != EINVAL) {
402                         fprintf(stderr, "setaffinity %d\n", cpuid);
403                         exit(1);
404                 }
405                 return 1;
406         }
407 
408         return 0;
409 }
410 
411 int main(int argc, char **argv)
412 {
413         const int expect_hash[2][2]     = { { 15, 5 },  { 20, 5 } };
414         const int expect_hash_rb[2][2]  = { { 15, 5 },  { 20, 15 } };
415         const int expect_lb[2][2]       = { { 10, 10 }, { 18, 17 } };
416         const int expect_rb[2][2]       = { { 15, 5 },  { 20, 15 } };
417         const int expect_cpu0[2][2]     = { { 20, 0 },  { 20, 0 } };
418         const int expect_cpu1[2][2]     = { { 0, 20 },  { 0, 20 } };
419         const int expect_bpf[2][2]      = { { 15, 5 },  { 15, 20 } };
420         const int expect_uniqueid[2][2] = { { 20, 20},  { 20, 20 } };
421         int port_off = 2, tries = 5, ret;
422 
423         test_control_single();
424         test_control_group();
425         test_unique_fanout_group_ids();
426 
427         /* find a set of ports that do not collide onto the same socket */
428         ret = test_datapath(PACKET_FANOUT_HASH, port_off,
429                             expect_hash[0], expect_hash[1]);
430         while (ret && tries--) {
431                 fprintf(stderr, "info: trying alternate ports (%d)\n", tries);
432                 ret = test_datapath(PACKET_FANOUT_HASH, ++port_off,
433                                     expect_hash[0], expect_hash[1]);
434         }
435 
436         ret |= test_datapath(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_ROLLOVER,
437                              port_off, expect_hash_rb[0], expect_hash_rb[1]);
438         ret |= test_datapath(PACKET_FANOUT_LB,
439                              port_off, expect_lb[0], expect_lb[1]);
440         ret |= test_datapath(PACKET_FANOUT_ROLLOVER,
441                              port_off, expect_rb[0], expect_rb[1]);
442 
443         ret |= test_datapath(PACKET_FANOUT_CBPF,
444                              port_off, expect_bpf[0], expect_bpf[1]);
445         ret |= test_datapath(PACKET_FANOUT_EBPF,
446                              port_off, expect_bpf[0], expect_bpf[1]);
447 
448         set_cpuaffinity(0);
449         ret |= test_datapath(PACKET_FANOUT_CPU, port_off,
450                              expect_cpu0[0], expect_cpu0[1]);
451         if (!set_cpuaffinity(1))
452                 /* TODO: test that choice alternates with previous */
453                 ret |= test_datapath(PACKET_FANOUT_CPU, port_off,
454                                      expect_cpu1[0], expect_cpu1[1]);
455 
456         ret |= test_datapath(PACKET_FANOUT_FLAG_UNIQUEID, port_off,
457                              expect_uniqueid[0], expect_uniqueid[1]);
458 
459         if (ret)
460                 return 1;
461 
462         printf("OK. All tests passed\n");
463         return 0;
464 }
465 

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