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30#define _GNU_SOURCE
31
32#include <arpa/inet.h>
33#include <errno.h>
34#include <fcntl.h>
35#include <linux/unistd.h>
36#include <linux/filter.h>
37#include <linux/bpf.h>
38#include <linux/if_packet.h>
39#include <net/if.h>
40#include <net/ethernet.h>
41#include <netinet/ip.h>
42#include <netinet/udp.h>
43#include <poll.h>
44#include <sched.h>
45#include <stdint.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <string.h>
49#include <sys/mman.h>
50#include <sys/socket.h>
51#include <sys/stat.h>
52#include <sys/types.h>
53#include <unistd.h>
54
55#include "psock_lib.h"
56
57#define RING_NUM_FRAMES 20
58
59static uint32_t cfg_max_num_members;
60
61
62
63static int sock_fanout_open(uint16_t typeflags, uint16_t group_id)
64{
65 struct sockaddr_ll addr = {0};
66 struct fanout_args args;
67 int fd, val, err;
68
69 fd = socket(PF_PACKET, SOCK_RAW, 0);
70 if (fd < 0) {
71 perror("socket packet");
72 exit(1);
73 }
74
75 pair_udp_setfilter(fd);
76
77 addr.sll_family = AF_PACKET;
78 addr.sll_protocol = htons(ETH_P_IP);
79 addr.sll_ifindex = if_nametoindex("lo");
80 if (addr.sll_ifindex == 0) {
81 perror("if_nametoindex");
82 exit(1);
83 }
84 if (bind(fd, (void *) &addr, sizeof(addr))) {
85 perror("bind packet");
86 exit(1);
87 }
88
89 if (cfg_max_num_members) {
90 args.id = group_id;
91 args.type_flags = typeflags;
92 args.max_num_members = cfg_max_num_members;
93 err = setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &args,
94 sizeof(args));
95 } else {
96 val = (((int) typeflags) << 16) | group_id;
97 err = setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &val,
98 sizeof(val));
99 }
100 if (err) {
101 if (close(fd)) {
102 perror("close packet");
103 exit(1);
104 }
105 return -1;
106 }
107
108 return fd;
109}
110
111static void sock_fanout_set_cbpf(int fd)
112{
113 struct sock_filter bpf_filter[] = {
114 BPF_STMT(BPF_LD | BPF_B | BPF_ABS, 80),
115 BPF_STMT(BPF_RET | BPF_A, 0),
116 };
117 struct sock_fprog bpf_prog;
118
119 bpf_prog.filter = bpf_filter;
120 bpf_prog.len = sizeof(bpf_filter) / sizeof(struct sock_filter);
121
122 if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT_DATA, &bpf_prog,
123 sizeof(bpf_prog))) {
124 perror("fanout data cbpf");
125 exit(1);
126 }
127}
128
129static void sock_fanout_getopts(int fd, uint16_t *typeflags, uint16_t *group_id)
130{
131 int sockopt;
132 socklen_t sockopt_len = sizeof(sockopt);
133
134 if (getsockopt(fd, SOL_PACKET, PACKET_FANOUT,
135 &sockopt, &sockopt_len)) {
136 perror("failed to getsockopt");
137 exit(1);
138 }
139 *typeflags = sockopt >> 16;
140 *group_id = sockopt & 0xfffff;
141}
142
143static void sock_fanout_set_ebpf(int fd)
144{
145 static char log_buf[65536];
146
147 const int len_off = __builtin_offsetof(struct __sk_buff, len);
148 struct bpf_insn prog[] = {
149 { BPF_ALU64 | BPF_MOV | BPF_X, 6, 1, 0, 0 },
150 { BPF_LDX | BPF_W | BPF_MEM, 0, 6, len_off, 0 },
151 { BPF_JMP | BPF_JGE | BPF_K, 0, 0, 1, DATA_LEN },
152 { BPF_JMP | BPF_JA | BPF_K, 0, 0, 4, 0 },
153 { BPF_LD | BPF_B | BPF_ABS, 0, 0, 0, 0x50 },
154 { BPF_JMP | BPF_JEQ | BPF_K, 0, 0, 2, DATA_CHAR },
155 { BPF_JMP | BPF_JEQ | BPF_K, 0, 0, 1, DATA_CHAR_1 },
156 { BPF_ALU | BPF_MOV | BPF_K, 0, 0, 0, 0 },
157 { BPF_JMP | BPF_EXIT, 0, 0, 0, 0 }
158 };
159 union bpf_attr attr;
160 int pfd;
161
162 memset(&attr, 0, sizeof(attr));
163 attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
164 attr.insns = (unsigned long) prog;
165 attr.insn_cnt = sizeof(prog) / sizeof(prog[0]);
166 attr.license = (unsigned long) "GPL";
167 attr.log_buf = (unsigned long) log_buf,
168 attr.log_size = sizeof(log_buf),
169 attr.log_level = 1,
170
171 pfd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
172 if (pfd < 0) {
173 perror("bpf");
174 fprintf(stderr, "bpf verifier:\n%s\n", log_buf);
175 exit(1);
176 }
177
178 if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT_DATA, &pfd, sizeof(pfd))) {
179 perror("fanout data ebpf");
180 exit(1);
181 }
182
183 if (close(pfd)) {
184 perror("close ebpf");
185 exit(1);
186 }
187}
188
189static char *sock_fanout_open_ring(int fd)
190{
191 struct tpacket_req req = {
192 .tp_block_size = getpagesize(),
193 .tp_frame_size = getpagesize(),
194 .tp_block_nr = RING_NUM_FRAMES,
195 .tp_frame_nr = RING_NUM_FRAMES,
196 };
197 char *ring;
198 int val = TPACKET_V2;
199
200 if (setsockopt(fd, SOL_PACKET, PACKET_VERSION, (void *) &val,
201 sizeof(val))) {
202 perror("packetsock ring setsockopt version");
203 exit(1);
204 }
205 if (setsockopt(fd, SOL_PACKET, PACKET_RX_RING, (void *) &req,
206 sizeof(req))) {
207 perror("packetsock ring setsockopt");
208 exit(1);
209 }
210
211 ring = mmap(0, req.tp_block_size * req.tp_block_nr,
212 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
213 if (ring == MAP_FAILED) {
214 perror("packetsock ring mmap");
215 exit(1);
216 }
217
218 return ring;
219}
220
221static int sock_fanout_read_ring(int fd, void *ring)
222{
223 struct tpacket2_hdr *header = ring;
224 int count = 0;
225
226 while (count < RING_NUM_FRAMES && header->tp_status & TP_STATUS_USER) {
227 count++;
228 header = ring + (count * getpagesize());
229 }
230
231 return count;
232}
233
234static int sock_fanout_read(int fds[], char *rings[], const int expect[])
235{
236 int ret[2];
237
238 ret[0] = sock_fanout_read_ring(fds[0], rings[0]);
239 ret[1] = sock_fanout_read_ring(fds[1], rings[1]);
240
241 fprintf(stderr, "info: count=%d,%d, expect=%d,%d\n",
242 ret[0], ret[1], expect[0], expect[1]);
243
244 if ((!(ret[0] == expect[0] && ret[1] == expect[1])) &&
245 (!(ret[0] == expect[1] && ret[1] == expect[0]))) {
246 fprintf(stderr, "warning: incorrect queue lengths\n");
247 return 1;
248 }
249
250 return 0;
251}
252
253
254static void test_control_single(void)
255{
256 fprintf(stderr, "test: control single socket\n");
257
258 if (sock_fanout_open(PACKET_FANOUT_ROLLOVER |
259 PACKET_FANOUT_FLAG_ROLLOVER, 0) != -1) {
260 fprintf(stderr, "ERROR: opened socket with dual rollover\n");
261 exit(1);
262 }
263}
264
265
266static void test_control_group(void)
267{
268 int fds[2];
269
270 fprintf(stderr, "test: control multiple sockets\n");
271
272 fds[0] = sock_fanout_open(PACKET_FANOUT_HASH, 0);
273 if (fds[0] == -1) {
274 fprintf(stderr, "ERROR: failed to open HASH socket\n");
275 exit(1);
276 }
277 if (sock_fanout_open(PACKET_FANOUT_HASH |
278 PACKET_FANOUT_FLAG_DEFRAG, 0) != -1) {
279 fprintf(stderr, "ERROR: joined group with wrong flag defrag\n");
280 exit(1);
281 }
282 if (sock_fanout_open(PACKET_FANOUT_HASH |
283 PACKET_FANOUT_FLAG_ROLLOVER, 0) != -1) {
284 fprintf(stderr, "ERROR: joined group with wrong flag ro\n");
285 exit(1);
286 }
287 if (sock_fanout_open(PACKET_FANOUT_CPU, 0) != -1) {
288 fprintf(stderr, "ERROR: joined group with wrong mode\n");
289 exit(1);
290 }
291 fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, 0);
292 if (fds[1] == -1) {
293 fprintf(stderr, "ERROR: failed to join group\n");
294 exit(1);
295 }
296 if (close(fds[1]) || close(fds[0])) {
297 fprintf(stderr, "ERROR: closing sockets\n");
298 exit(1);
299 }
300}
301
302
303static void test_control_group_max_num_members(void)
304{
305 int fds[3];
306
307 fprintf(stderr, "test: control multiple sockets, max_num_members\n");
308
309
310 cfg_max_num_members = (1 << 16) + 1;
311 if (sock_fanout_open(PACKET_FANOUT_HASH, 0) != -1) {
312 fprintf(stderr, "ERROR: max_num_members > PACKET_FANOUT_MAX\n");
313 exit(1);
314 }
315
316 cfg_max_num_members = 256;
317 fds[0] = sock_fanout_open(PACKET_FANOUT_HASH, 0);
318 if (fds[0] == -1) {
319 fprintf(stderr, "ERROR: failed open\n");
320 exit(1);
321 }
322
323
324 cfg_max_num_members = 257;
325 if (sock_fanout_open(PACKET_FANOUT_HASH, 0) != -1) {
326 fprintf(stderr, "ERROR: set different max_num_members\n");
327 exit(1);
328 }
329
330
331 cfg_max_num_members = 256;
332 fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, 0);
333 if (fds[1] == -1) {
334 fprintf(stderr, "ERROR: failed to join group\n");
335 exit(1);
336 }
337
338
339 cfg_max_num_members = 0;
340 fds[2] = sock_fanout_open(PACKET_FANOUT_HASH, 0);
341 if (fds[2] == -1) {
342 fprintf(stderr, "ERROR: failed to join group\n");
343 exit(1);
344 }
345
346 if (close(fds[2]) || close(fds[1]) || close(fds[0])) {
347 fprintf(stderr, "ERROR: closing sockets\n");
348 exit(1);
349 }
350}
351
352
353static void test_unique_fanout_group_ids(void)
354{
355 int fds[3];
356 uint16_t typeflags, first_group_id, second_group_id;
357
358 fprintf(stderr, "test: unique ids\n");
359
360 fds[0] = sock_fanout_open(PACKET_FANOUT_HASH |
361 PACKET_FANOUT_FLAG_UNIQUEID, 0);
362 if (fds[0] == -1) {
363 fprintf(stderr, "ERROR: failed to create a unique id group.\n");
364 exit(1);
365 }
366
367 sock_fanout_getopts(fds[0], &typeflags, &first_group_id);
368 if (typeflags != PACKET_FANOUT_HASH) {
369 fprintf(stderr, "ERROR: unexpected typeflags %x\n", typeflags);
370 exit(1);
371 }
372
373 if (sock_fanout_open(PACKET_FANOUT_CPU, first_group_id) != -1) {
374 fprintf(stderr, "ERROR: joined group with wrong type.\n");
375 exit(1);
376 }
377
378 fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, first_group_id);
379 if (fds[1] == -1) {
380 fprintf(stderr,
381 "ERROR: failed to join previously created group.\n");
382 exit(1);
383 }
384
385 fds[2] = sock_fanout_open(PACKET_FANOUT_HASH |
386 PACKET_FANOUT_FLAG_UNIQUEID, 0);
387 if (fds[2] == -1) {
388 fprintf(stderr,
389 "ERROR: failed to create a second unique id group.\n");
390 exit(1);
391 }
392
393 sock_fanout_getopts(fds[2], &typeflags, &second_group_id);
394 if (sock_fanout_open(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_UNIQUEID,
395 second_group_id) != -1) {
396 fprintf(stderr,
397 "ERROR: specified a group id when requesting unique id\n");
398 exit(1);
399 }
400
401 if (close(fds[0]) || close(fds[1]) || close(fds[2])) {
402 fprintf(stderr, "ERROR: closing sockets\n");
403 exit(1);
404 }
405}
406
407static int test_datapath(uint16_t typeflags, int port_off,
408 const int expect1[], const int expect2[])
409{
410 const int expect0[] = { 0, 0 };
411 char *rings[2];
412 uint8_t type = typeflags & 0xFF;
413 int fds[2], fds_udp[2][2], ret;
414
415 fprintf(stderr, "\ntest: datapath 0x%hx ports %hu,%hu\n",
416 typeflags, (uint16_t)PORT_BASE,
417 (uint16_t)(PORT_BASE + port_off));
418
419 fds[0] = sock_fanout_open(typeflags, 0);
420 fds[1] = sock_fanout_open(typeflags, 0);
421 if (fds[0] == -1 || fds[1] == -1) {
422 fprintf(stderr, "ERROR: failed open\n");
423 exit(1);
424 }
425 if (type == PACKET_FANOUT_CBPF)
426 sock_fanout_set_cbpf(fds[0]);
427 else if (type == PACKET_FANOUT_EBPF)
428 sock_fanout_set_ebpf(fds[0]);
429
430 rings[0] = sock_fanout_open_ring(fds[0]);
431 rings[1] = sock_fanout_open_ring(fds[1]);
432 pair_udp_open(fds_udp[0], PORT_BASE);
433 pair_udp_open(fds_udp[1], PORT_BASE + port_off);
434 sock_fanout_read(fds, rings, expect0);
435
436
437 pair_udp_send(fds_udp[0], 15);
438 pair_udp_send_char(fds_udp[1], 5, DATA_CHAR_1);
439 ret = sock_fanout_read(fds, rings, expect1);
440
441
442 pair_udp_send_char(fds_udp[0], 15, DATA_CHAR_1);
443
444 ret |= sock_fanout_read(fds, rings, expect2);
445
446 if (munmap(rings[1], RING_NUM_FRAMES * getpagesize()) ||
447 munmap(rings[0], RING_NUM_FRAMES * getpagesize())) {
448 fprintf(stderr, "close rings\n");
449 exit(1);
450 }
451 if (close(fds_udp[1][1]) || close(fds_udp[1][0]) ||
452 close(fds_udp[0][1]) || close(fds_udp[0][0]) ||
453 close(fds[1]) || close(fds[0])) {
454 fprintf(stderr, "close datapath\n");
455 exit(1);
456 }
457
458 return ret;
459}
460
461static int set_cpuaffinity(int cpuid)
462{
463 cpu_set_t mask;
464
465 CPU_ZERO(&mask);
466 CPU_SET(cpuid, &mask);
467 if (sched_setaffinity(0, sizeof(mask), &mask)) {
468 if (errno != EINVAL) {
469 fprintf(stderr, "setaffinity %d\n", cpuid);
470 exit(1);
471 }
472 return 1;
473 }
474
475 return 0;
476}
477
478int main(int argc, char **argv)
479{
480 const int expect_hash[2][2] = { { 15, 5 }, { 20, 5 } };
481 const int expect_hash_rb[2][2] = { { 15, 5 }, { 20, 15 } };
482 const int expect_lb[2][2] = { { 10, 10 }, { 18, 17 } };
483 const int expect_rb[2][2] = { { 15, 5 }, { 20, 15 } };
484 const int expect_cpu0[2][2] = { { 20, 0 }, { 20, 0 } };
485 const int expect_cpu1[2][2] = { { 0, 20 }, { 0, 20 } };
486 const int expect_bpf[2][2] = { { 15, 5 }, { 15, 20 } };
487 const int expect_uniqueid[2][2] = { { 20, 20}, { 20, 20 } };
488 int port_off = 2, tries = 20, ret;
489
490 test_control_single();
491 test_control_group();
492 test_control_group_max_num_members();
493 test_unique_fanout_group_ids();
494
495
496 cfg_max_num_members = 1 << 16;
497
498 ret = test_datapath(PACKET_FANOUT_HASH, port_off,
499 expect_hash[0], expect_hash[1]);
500 while (ret) {
501 fprintf(stderr, "info: trying alternate ports (%d)\n", tries);
502 ret = test_datapath(PACKET_FANOUT_HASH, ++port_off,
503 expect_hash[0], expect_hash[1]);
504 if (!--tries) {
505 fprintf(stderr, "too many collisions\n");
506 return 1;
507 }
508 }
509
510 ret |= test_datapath(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_ROLLOVER,
511 port_off, expect_hash_rb[0], expect_hash_rb[1]);
512 ret |= test_datapath(PACKET_FANOUT_LB,
513 port_off, expect_lb[0], expect_lb[1]);
514 ret |= test_datapath(PACKET_FANOUT_ROLLOVER,
515 port_off, expect_rb[0], expect_rb[1]);
516
517 ret |= test_datapath(PACKET_FANOUT_CBPF,
518 port_off, expect_bpf[0], expect_bpf[1]);
519 ret |= test_datapath(PACKET_FANOUT_EBPF,
520 port_off, expect_bpf[0], expect_bpf[1]);
521
522 set_cpuaffinity(0);
523 ret |= test_datapath(PACKET_FANOUT_CPU, port_off,
524 expect_cpu0[0], expect_cpu0[1]);
525 if (!set_cpuaffinity(1))
526
527 ret |= test_datapath(PACKET_FANOUT_CPU, port_off,
528 expect_cpu1[0], expect_cpu1[1]);
529
530 ret |= test_datapath(PACKET_FANOUT_FLAG_UNIQUEID, port_off,
531 expect_uniqueid[0], expect_uniqueid[1]);
532
533 if (ret)
534 return 1;
535
536 printf("OK. All tests passed\n");
537 return 0;
538}
539
