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