540 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright 2013 Google Inc.4 * Author: Willem de Bruijn (willemb@google.com)5 *6 * A basic test of packet socket fanout behavior.7 *8 * Control:9 * - create fanout fails as expected with illegal flag combinations10 * - join fanout fails as expected with diverging types or flags11 *12 * Datapath:13 * Open a pair of packet sockets and a pair of INET sockets, send a known14 * number of packets across the two INET sockets and count the number of15 * packets enqueued onto the two packet sockets.16 *17 * The test currently runs for18 * - PACKET_FANOUT_HASH19 * - PACKET_FANOUT_HASH with PACKET_FANOUT_FLAG_ROLLOVER20 * - PACKET_FANOUT_LB21 * - PACKET_FANOUT_CPU22 * - PACKET_FANOUT_ROLLOVER23 * - PACKET_FANOUT_CBPF24 * - PACKET_FANOUT_EBPF25 *26 * Todo:27 * - functionality: PACKET_FANOUT_FLAG_DEFRAG28 */29 30#define _GNU_SOURCE /* for sched_setaffinity */31 32#include <arpa/inet.h>33#include <errno.h>34#include <fcntl.h>35#include <linux/unistd.h> /* for __NR_bpf */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#include "../kselftest.h"57 58#define RING_NUM_FRAMES 2059 60static uint32_t cfg_max_num_members;61 62/* Open a socket in a given fanout mode.63 * @return -1 if mode is bad, a valid socket otherwise */64static int sock_fanout_open(uint16_t typeflags, uint16_t group_id)65{66 struct sockaddr_ll addr = {0};67 struct fanout_args args;68 int fd, val, err;69 70 fd = socket(PF_PACKET, SOCK_RAW, 0);71 if (fd < 0) {72 perror("socket packet");73 exit(1);74 }75 76 pair_udp_setfilter(fd);77 78 addr.sll_family = AF_PACKET;79 addr.sll_protocol = htons(ETH_P_IP);80 addr.sll_ifindex = if_nametoindex("lo");81 if (addr.sll_ifindex == 0) {82 perror("if_nametoindex");83 exit(1);84 }85 if (bind(fd, (void *) &addr, sizeof(addr))) {86 perror("bind packet");87 exit(1);88 }89 90 if (cfg_max_num_members) {91 args.id = group_id;92 args.type_flags = typeflags;93 args.max_num_members = cfg_max_num_members;94 err = setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &args,95 sizeof(args));96 } else {97 val = (((int) typeflags) << 16) | group_id;98 err = setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &val,99 sizeof(val));100 }101 if (err) {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), /* ldb [80] */116 BPF_STMT(BPF_RET | BPF_A, 0), /* ret A */117 };118 struct sock_fprog bpf_prog;119 120 bpf_prog.filter = bpf_filter;121 bpf_prog.len = ARRAY_SIZE(bpf_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 = ARRAY_SIZE(prog);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/* Test illegal mode + flag combination */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/* Test illegal group with different modes or flags */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/* Test illegal max_num_members values */304static void test_control_group_max_num_members(void)305{306 int fds[3];307 308 fprintf(stderr, "test: control multiple sockets, max_num_members\n");309 310 /* expected failure on greater than PACKET_FANOUT_MAX */311 cfg_max_num_members = (1 << 16) + 1;312 if (sock_fanout_open(PACKET_FANOUT_HASH, 0) != -1) {313 fprintf(stderr, "ERROR: max_num_members > PACKET_FANOUT_MAX\n");314 exit(1);315 }316 317 cfg_max_num_members = 256;318 fds[0] = sock_fanout_open(PACKET_FANOUT_HASH, 0);319 if (fds[0] == -1) {320 fprintf(stderr, "ERROR: failed open\n");321 exit(1);322 }323 324 /* expected failure on joining group with different max_num_members */325 cfg_max_num_members = 257;326 if (sock_fanout_open(PACKET_FANOUT_HASH, 0) != -1) {327 fprintf(stderr, "ERROR: set different max_num_members\n");328 exit(1);329 }330 331 /* success on joining group with same max_num_members */332 cfg_max_num_members = 256;333 fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, 0);334 if (fds[1] == -1) {335 fprintf(stderr, "ERROR: failed to join group\n");336 exit(1);337 }338 339 /* success on joining group with max_num_members unspecified */340 cfg_max_num_members = 0;341 fds[2] = sock_fanout_open(PACKET_FANOUT_HASH, 0);342 if (fds[2] == -1) {343 fprintf(stderr, "ERROR: failed to join group\n");344 exit(1);345 }346 347 if (close(fds[2]) || close(fds[1]) || close(fds[0])) {348 fprintf(stderr, "ERROR: closing sockets\n");349 exit(1);350 }351}352 353/* Test creating a unique fanout group ids */354static void test_unique_fanout_group_ids(void)355{356 int fds[3];357 uint16_t typeflags, first_group_id, second_group_id;358 359 fprintf(stderr, "test: unique ids\n");360 361 fds[0] = sock_fanout_open(PACKET_FANOUT_HASH |362 PACKET_FANOUT_FLAG_UNIQUEID, 0);363 if (fds[0] == -1) {364 fprintf(stderr, "ERROR: failed to create a unique id group.\n");365 exit(1);366 }367 368 sock_fanout_getopts(fds[0], &typeflags, &first_group_id);369 if (typeflags != PACKET_FANOUT_HASH) {370 fprintf(stderr, "ERROR: unexpected typeflags %x\n", typeflags);371 exit(1);372 }373 374 if (sock_fanout_open(PACKET_FANOUT_CPU, first_group_id) != -1) {375 fprintf(stderr, "ERROR: joined group with wrong type.\n");376 exit(1);377 }378 379 fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, first_group_id);380 if (fds[1] == -1) {381 fprintf(stderr,382 "ERROR: failed to join previously created group.\n");383 exit(1);384 }385 386 fds[2] = sock_fanout_open(PACKET_FANOUT_HASH |387 PACKET_FANOUT_FLAG_UNIQUEID, 0);388 if (fds[2] == -1) {389 fprintf(stderr,390 "ERROR: failed to create a second unique id group.\n");391 exit(1);392 }393 394 sock_fanout_getopts(fds[2], &typeflags, &second_group_id);395 if (sock_fanout_open(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_UNIQUEID,396 second_group_id) != -1) {397 fprintf(stderr,398 "ERROR: specified a group id when requesting unique id\n");399 exit(1);400 }401 402 if (close(fds[0]) || close(fds[1]) || close(fds[2])) {403 fprintf(stderr, "ERROR: closing sockets\n");404 exit(1);405 }406}407 408static int test_datapath(uint16_t typeflags, int port_off,409 const int expect1[], const int expect2[])410{411 const int expect0[] = { 0, 0 };412 char *rings[2];413 uint8_t type = typeflags & 0xFF;414 int fds[2], fds_udp[2][2], ret;415 416 fprintf(stderr, "\ntest: datapath 0x%hx ports %hu,%hu\n",417 typeflags, (uint16_t)PORT_BASE,418 (uint16_t)(PORT_BASE + port_off));419 420 fds[0] = sock_fanout_open(typeflags, 0);421 fds[1] = sock_fanout_open(typeflags, 0);422 if (fds[0] == -1 || fds[1] == -1) {423 fprintf(stderr, "ERROR: failed open\n");424 exit(1);425 }426 if (type == PACKET_FANOUT_CBPF)427 sock_fanout_set_cbpf(fds[0]);428 else if (type == PACKET_FANOUT_EBPF)429 sock_fanout_set_ebpf(fds[0]);430 431 rings[0] = sock_fanout_open_ring(fds[0]);432 rings[1] = sock_fanout_open_ring(fds[1]);433 pair_udp_open(fds_udp[0], PORT_BASE);434 pair_udp_open(fds_udp[1], PORT_BASE + port_off);435 sock_fanout_read(fds, rings, expect0);436 437 /* Send data, but not enough to overflow a queue */438 pair_udp_send(fds_udp[0], 15);439 pair_udp_send_char(fds_udp[1], 5, DATA_CHAR_1);440 ret = sock_fanout_read(fds, rings, expect1);441 442 /* Send more data, overflow the queue */443 pair_udp_send_char(fds_udp[0], 15, DATA_CHAR_1);444 /* TODO: ensure consistent order between expect1 and expect2 */445 ret |= sock_fanout_read(fds, rings, expect2);446 447 if (munmap(rings[1], RING_NUM_FRAMES * getpagesize()) ||448 munmap(rings[0], RING_NUM_FRAMES * getpagesize())) {449 fprintf(stderr, "close rings\n");450 exit(1);451 }452 if (close(fds_udp[1][1]) || close(fds_udp[1][0]) ||453 close(fds_udp[0][1]) || close(fds_udp[0][0]) ||454 close(fds[1]) || close(fds[0])) {455 fprintf(stderr, "close datapath\n");456 exit(1);457 }458 459 return ret;460}461 462static int set_cpuaffinity(int cpuid)463{464 cpu_set_t mask;465 466 CPU_ZERO(&mask);467 CPU_SET(cpuid, &mask);468 if (sched_setaffinity(0, sizeof(mask), &mask)) {469 if (errno != EINVAL) {470 fprintf(stderr, "setaffinity %d\n", cpuid);471 exit(1);472 }473 return 1;474 }475 476 return 0;477}478 479int main(int argc, char **argv)480{481 const int expect_hash[2][2] = { { 15, 5 }, { 20, 5 } };482 const int expect_hash_rb[2][2] = { { 15, 5 }, { 20, 15 } };483 const int expect_lb[2][2] = { { 10, 10 }, { 18, 17 } };484 const int expect_rb[2][2] = { { 15, 5 }, { 20, 15 } };485 const int expect_cpu0[2][2] = { { 20, 0 }, { 20, 0 } };486 const int expect_cpu1[2][2] = { { 0, 20 }, { 0, 20 } };487 const int expect_bpf[2][2] = { { 15, 5 }, { 15, 20 } };488 const int expect_uniqueid[2][2] = { { 20, 20}, { 20, 20 } };489 int port_off = 2, tries = 20, ret;490 491 test_control_single();492 test_control_group();493 test_control_group_max_num_members();494 test_unique_fanout_group_ids();495 496 /* PACKET_FANOUT_MAX */497 cfg_max_num_members = 1 << 16;498 /* find a set of ports that do not collide onto the same socket */499 ret = test_datapath(PACKET_FANOUT_HASH, port_off,500 expect_hash[0], expect_hash[1]);501 while (ret) {502 fprintf(stderr, "info: trying alternate ports (%d)\n", tries);503 ret = test_datapath(PACKET_FANOUT_HASH, ++port_off,504 expect_hash[0], expect_hash[1]);505 if (!--tries) {506 fprintf(stderr, "too many collisions\n");507 return 1;508 }509 }510 511 ret |= test_datapath(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_ROLLOVER,512 port_off, expect_hash_rb[0], expect_hash_rb[1]);513 ret |= test_datapath(PACKET_FANOUT_LB,514 port_off, expect_lb[0], expect_lb[1]);515 ret |= test_datapath(PACKET_FANOUT_ROLLOVER,516 port_off, expect_rb[0], expect_rb[1]);517 518 ret |= test_datapath(PACKET_FANOUT_CBPF,519 port_off, expect_bpf[0], expect_bpf[1]);520 ret |= test_datapath(PACKET_FANOUT_EBPF,521 port_off, expect_bpf[0], expect_bpf[1]);522 523 set_cpuaffinity(0);524 ret |= test_datapath(PACKET_FANOUT_CPU, port_off,525 expect_cpu0[0], expect_cpu0[1]);526 if (!set_cpuaffinity(1))527 /* TODO: test that choice alternates with previous */528 ret |= test_datapath(PACKET_FANOUT_CPU, port_off,529 expect_cpu1[0], expect_cpu1[1]);530 531 ret |= test_datapath(PACKET_FANOUT_FLAG_UNIQUEID, port_off,532 expect_uniqueid[0], expect_uniqueid[1]);533 534 if (ret)535 return 1;536 537 printf("OK. All tests passed\n");538 return 0;539}540