1 /* 2 * Vhost User Bridge 3 * 4 * Copyright (c) 2015 Red Hat, Inc. 5 * 6 * Authors: 7 * Victor Kaplansky <victork@redhat.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or 10 * later. See the COPYING file in the top-level directory. 11 */ 12 13 /* 14 * TODO: 15 * - main should get parameters from the command line. 16 * - implement all request handlers. Still not implemented: 17 * vubr_get_queue_num_exec() 18 * vubr_send_rarp_exec() 19 * - test for broken requests and virtqueue. 20 * - implement features defined by Virtio 1.0 spec. 21 * - support mergeable buffers and indirect descriptors. 22 * - implement clean shutdown. 23 * - implement non-blocking writes to UDP backend. 24 * - implement polling strategy. 25 * - implement clean starting/stopping of vq processing 26 * - implement clean starting/stopping of used and buffers 27 * dirty page logging. 28 */ 29 30 #define _FILE_OFFSET_BITS 64 31 32 #include "qemu/osdep.h" 33 #include <sys/socket.h> 34 #include <sys/un.h> 35 #include <sys/unistd.h> 36 #include <sys/eventfd.h> 37 #include <arpa/inet.h> 38 #include <netdb.h> 39 #include <linux/vhost.h> 40 41 #include "qemu/atomic.h" 42 #include "standard-headers/linux/virtio_net.h" 43 #include "standard-headers/linux/virtio_ring.h" 44 45 #define VHOST_USER_BRIDGE_DEBUG 1 46 47 #define DPRINT(...) \ 48 do { \ 49 if (VHOST_USER_BRIDGE_DEBUG) { \ 50 printf(__VA_ARGS__); \ 51 } \ 52 } while (0) 53 54 typedef void (*CallbackFunc)(int sock, void *ctx); 55 56 typedef struct Event { 57 void *ctx; 58 CallbackFunc callback; 59 } Event; 60 61 typedef struct Dispatcher { 62 int max_sock; 63 fd_set fdset; 64 Event events[FD_SETSIZE]; 65 } Dispatcher; 66 67 static void 68 vubr_die(const char *s) 69 { 70 perror(s); 71 exit(1); 72 } 73 74 static int 75 dispatcher_init(Dispatcher *dispr) 76 { 77 FD_ZERO(&dispr->fdset); 78 dispr->max_sock = -1; 79 return 0; 80 } 81 82 static int 83 dispatcher_add(Dispatcher *dispr, int sock, void *ctx, CallbackFunc cb) 84 { 85 if (sock >= FD_SETSIZE) { 86 fprintf(stderr, 87 "Error: Failed to add new event. sock %d should be less than %d\n", 88 sock, FD_SETSIZE); 89 return -1; 90 } 91 92 dispr->events[sock].ctx = ctx; 93 dispr->events[sock].callback = cb; 94 95 FD_SET(sock, &dispr->fdset); 96 if (sock > dispr->max_sock) { 97 dispr->max_sock = sock; 98 } 99 DPRINT("Added sock %d for watching. max_sock: %d\n", 100 sock, dispr->max_sock); 101 return 0; 102 } 103 104 static int 105 dispatcher_remove(Dispatcher *dispr, int sock) 106 { 107 if (sock >= FD_SETSIZE) { 108 fprintf(stderr, 109 "Error: Failed to remove event. sock %d should be less than %d\n", 110 sock, FD_SETSIZE); 111 return -1; 112 } 113 114 FD_CLR(sock, &dispr->fdset); 115 DPRINT("Sock %d removed from dispatcher watch.\n", sock); 116 return 0; 117 } 118 119 /* timeout in us */ 120 static int 121 dispatcher_wait(Dispatcher *dispr, uint32_t timeout) 122 { 123 struct timeval tv; 124 tv.tv_sec = timeout / 1000000; 125 tv.tv_usec = timeout % 1000000; 126 127 fd_set fdset = dispr->fdset; 128 129 /* wait until some of sockets become readable. */ 130 int rc = select(dispr->max_sock + 1, &fdset, 0, 0, &tv); 131 132 if (rc == -1) { 133 vubr_die("select"); 134 } 135 136 /* Timeout */ 137 if (rc == 0) { 138 return 0; 139 } 140 141 /* Now call callback for every ready socket. */ 142 143 int sock; 144 for (sock = 0; sock < dispr->max_sock + 1; sock++) { 145 /* The callback on a socket can remove other sockets from the 146 * dispatcher, thus we have to check that the socket is 147 * still not removed from dispatcher's list 148 */ 149 if (FD_ISSET(sock, &fdset) && FD_ISSET(sock, &dispr->fdset)) { 150 Event *e = &dispr->events[sock]; 151 e->callback(sock, e->ctx); 152 } 153 } 154 155 return 0; 156 } 157 158 typedef struct VubrVirtq { 159 int call_fd; 160 int kick_fd; 161 uint32_t size; 162 uint16_t last_avail_index; 163 uint16_t last_used_index; 164 struct vring_desc *desc; 165 struct vring_avail *avail; 166 struct vring_used *used; 167 uint64_t log_guest_addr; 168 int enable; 169 } VubrVirtq; 170 171 /* Based on qemu/hw/virtio/vhost-user.c */ 172 173 #define VHOST_MEMORY_MAX_NREGIONS 8 174 #define VHOST_USER_F_PROTOCOL_FEATURES 30 175 /* v1.0 compliant. */ 176 #define VIRTIO_F_VERSION_1 32 177 178 #define VHOST_LOG_PAGE 4096 179 180 enum VhostUserProtocolFeature { 181 VHOST_USER_PROTOCOL_F_MQ = 0, 182 VHOST_USER_PROTOCOL_F_LOG_SHMFD = 1, 183 VHOST_USER_PROTOCOL_F_RARP = 2, 184 185 VHOST_USER_PROTOCOL_F_MAX 186 }; 187 188 #define VHOST_USER_PROTOCOL_FEATURE_MASK ((1 << VHOST_USER_PROTOCOL_F_MAX) - 1) 189 190 typedef enum VhostUserRequest { 191 VHOST_USER_NONE = 0, 192 VHOST_USER_GET_FEATURES = 1, 193 VHOST_USER_SET_FEATURES = 2, 194 VHOST_USER_SET_OWNER = 3, 195 VHOST_USER_RESET_OWNER = 4, 196 VHOST_USER_SET_MEM_TABLE = 5, 197 VHOST_USER_SET_LOG_BASE = 6, 198 VHOST_USER_SET_LOG_FD = 7, 199 VHOST_USER_SET_VRING_NUM = 8, 200 VHOST_USER_SET_VRING_ADDR = 9, 201 VHOST_USER_SET_VRING_BASE = 10, 202 VHOST_USER_GET_VRING_BASE = 11, 203 VHOST_USER_SET_VRING_KICK = 12, 204 VHOST_USER_SET_VRING_CALL = 13, 205 VHOST_USER_SET_VRING_ERR = 14, 206 VHOST_USER_GET_PROTOCOL_FEATURES = 15, 207 VHOST_USER_SET_PROTOCOL_FEATURES = 16, 208 VHOST_USER_GET_QUEUE_NUM = 17, 209 VHOST_USER_SET_VRING_ENABLE = 18, 210 VHOST_USER_SEND_RARP = 19, 211 VHOST_USER_MAX 212 } VhostUserRequest; 213 214 typedef struct VhostUserMemoryRegion { 215 uint64_t guest_phys_addr; 216 uint64_t memory_size; 217 uint64_t userspace_addr; 218 uint64_t mmap_offset; 219 } VhostUserMemoryRegion; 220 221 typedef struct VhostUserMemory { 222 uint32_t nregions; 223 uint32_t padding; 224 VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS]; 225 } VhostUserMemory; 226 227 typedef struct VhostUserLog { 228 uint64_t mmap_size; 229 uint64_t mmap_offset; 230 } VhostUserLog; 231 232 typedef struct VhostUserMsg { 233 VhostUserRequest request; 234 235 #define VHOST_USER_VERSION_MASK (0x3) 236 #define VHOST_USER_REPLY_MASK (0x1<<2) 237 uint32_t flags; 238 uint32_t size; /* the following payload size */ 239 union { 240 #define VHOST_USER_VRING_IDX_MASK (0xff) 241 #define VHOST_USER_VRING_NOFD_MASK (0x1<<8) 242 uint64_t u64; 243 struct vhost_vring_state state; 244 struct vhost_vring_addr addr; 245 VhostUserMemory memory; 246 VhostUserLog log; 247 } payload; 248 int fds[VHOST_MEMORY_MAX_NREGIONS]; 249 int fd_num; 250 } QEMU_PACKED VhostUserMsg; 251 252 #define VHOST_USER_HDR_SIZE offsetof(VhostUserMsg, payload.u64) 253 254 /* The version of the protocol we support */ 255 #define VHOST_USER_VERSION (0x1) 256 257 #define MAX_NR_VIRTQUEUE (8) 258 259 typedef struct VubrDevRegion { 260 /* Guest Physical address. */ 261 uint64_t gpa; 262 /* Memory region size. */ 263 uint64_t size; 264 /* QEMU virtual address (userspace). */ 265 uint64_t qva; 266 /* Starting offset in our mmaped space. */ 267 uint64_t mmap_offset; 268 /* Start address of mmaped space. */ 269 uint64_t mmap_addr; 270 } VubrDevRegion; 271 272 typedef struct VubrDev { 273 int sock; 274 Dispatcher dispatcher; 275 uint32_t nregions; 276 VubrDevRegion regions[VHOST_MEMORY_MAX_NREGIONS]; 277 VubrVirtq vq[MAX_NR_VIRTQUEUE]; 278 int log_call_fd; 279 uint64_t log_size; 280 uint8_t *log_table; 281 int backend_udp_sock; 282 struct sockaddr_in backend_udp_dest; 283 int ready; 284 uint64_t features; 285 int hdrlen; 286 } VubrDev; 287 288 static const char *vubr_request_str[] = { 289 [VHOST_USER_NONE] = "VHOST_USER_NONE", 290 [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES", 291 [VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES", 292 [VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER", 293 [VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER", 294 [VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE", 295 [VHOST_USER_SET_LOG_BASE] = "VHOST_USER_SET_LOG_BASE", 296 [VHOST_USER_SET_LOG_FD] = "VHOST_USER_SET_LOG_FD", 297 [VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM", 298 [VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR", 299 [VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE", 300 [VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE", 301 [VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK", 302 [VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL", 303 [VHOST_USER_SET_VRING_ERR] = "VHOST_USER_SET_VRING_ERR", 304 [VHOST_USER_GET_PROTOCOL_FEATURES] = "VHOST_USER_GET_PROTOCOL_FEATURES", 305 [VHOST_USER_SET_PROTOCOL_FEATURES] = "VHOST_USER_SET_PROTOCOL_FEATURES", 306 [VHOST_USER_GET_QUEUE_NUM] = "VHOST_USER_GET_QUEUE_NUM", 307 [VHOST_USER_SET_VRING_ENABLE] = "VHOST_USER_SET_VRING_ENABLE", 308 [VHOST_USER_SEND_RARP] = "VHOST_USER_SEND_RARP", 309 [VHOST_USER_MAX] = "VHOST_USER_MAX", 310 }; 311 312 static void 313 print_buffer(uint8_t *buf, size_t len) 314 { 315 int i; 316 printf("Raw buffer:\n"); 317 for (i = 0; i < len; i++) { 318 if (i % 16 == 0) { 319 printf("\n"); 320 } 321 if (i % 4 == 0) { 322 printf(" "); 323 } 324 printf("%02x ", buf[i]); 325 } 326 printf("\n............................................................\n"); 327 } 328 329 /* Translate guest physical address to our virtual address. */ 330 static uint64_t 331 gpa_to_va(VubrDev *dev, uint64_t guest_addr) 332 { 333 int i; 334 335 /* Find matching memory region. */ 336 for (i = 0; i < dev->nregions; i++) { 337 VubrDevRegion *r = &dev->regions[i]; 338 339 if ((guest_addr >= r->gpa) && (guest_addr < (r->gpa + r->size))) { 340 return guest_addr - r->gpa + r->mmap_addr + r->mmap_offset; 341 } 342 } 343 344 assert(!"address not found in regions"); 345 return 0; 346 } 347 348 /* Translate qemu virtual address to our virtual address. */ 349 static uint64_t 350 qva_to_va(VubrDev *dev, uint64_t qemu_addr) 351 { 352 int i; 353 354 /* Find matching memory region. */ 355 for (i = 0; i < dev->nregions; i++) { 356 VubrDevRegion *r = &dev->regions[i]; 357 358 if ((qemu_addr >= r->qva) && (qemu_addr < (r->qva + r->size))) { 359 return qemu_addr - r->qva + r->mmap_addr + r->mmap_offset; 360 } 361 } 362 363 assert(!"address not found in regions"); 364 return 0; 365 } 366 367 static void 368 vubr_message_read(int conn_fd, VhostUserMsg *vmsg) 369 { 370 char control[CMSG_SPACE(VHOST_MEMORY_MAX_NREGIONS * sizeof(int))] = { }; 371 struct iovec iov = { 372 .iov_base = (char *)vmsg, 373 .iov_len = VHOST_USER_HDR_SIZE, 374 }; 375 struct msghdr msg = { 376 .msg_iov = &iov, 377 .msg_iovlen = 1, 378 .msg_control = control, 379 .msg_controllen = sizeof(control), 380 }; 381 size_t fd_size; 382 struct cmsghdr *cmsg; 383 int rc; 384 385 rc = recvmsg(conn_fd, &msg, 0); 386 387 if (rc == 0) { 388 fprintf(stderr, "Peer disconnected.\n"); 389 exit(1); 390 } 391 if (rc < 0) { 392 vubr_die("recvmsg"); 393 } 394 395 vmsg->fd_num = 0; 396 for (cmsg = CMSG_FIRSTHDR(&msg); 397 cmsg != NULL; 398 cmsg = CMSG_NXTHDR(&msg, cmsg)) 399 { 400 if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) { 401 fd_size = cmsg->cmsg_len - CMSG_LEN(0); 402 vmsg->fd_num = fd_size / sizeof(int); 403 memcpy(vmsg->fds, CMSG_DATA(cmsg), fd_size); 404 break; 405 } 406 } 407 408 if (vmsg->size > sizeof(vmsg->payload)) { 409 fprintf(stderr, 410 "Error: too big message request: %d, size: vmsg->size: %u, " 411 "while sizeof(vmsg->payload) = %zu\n", 412 vmsg->request, vmsg->size, sizeof(vmsg->payload)); 413 exit(1); 414 } 415 416 if (vmsg->size) { 417 rc = read(conn_fd, &vmsg->payload, vmsg->size); 418 if (rc == 0) { 419 vubr_die("recvmsg"); 420 fprintf(stderr, "Peer disconnected.\n"); 421 exit(1); 422 } 423 if (rc < 0) { 424 vubr_die("recvmsg"); 425 } 426 427 assert(rc == vmsg->size); 428 } 429 } 430 431 static void 432 vubr_message_write(int conn_fd, VhostUserMsg *vmsg) 433 { 434 int rc; 435 436 do { 437 rc = write(conn_fd, vmsg, VHOST_USER_HDR_SIZE + vmsg->size); 438 } while (rc < 0 && errno == EINTR); 439 440 if (rc < 0) { 441 vubr_die("write"); 442 } 443 } 444 445 static void 446 vubr_backend_udp_sendbuf(VubrDev *dev, uint8_t *buf, size_t len) 447 { 448 int slen = sizeof(struct sockaddr_in); 449 450 if (sendto(dev->backend_udp_sock, buf, len, 0, 451 (struct sockaddr *) &dev->backend_udp_dest, slen) == -1) { 452 vubr_die("sendto()"); 453 } 454 } 455 456 static int 457 vubr_backend_udp_recvbuf(VubrDev *dev, uint8_t *buf, size_t buflen) 458 { 459 int slen = sizeof(struct sockaddr_in); 460 int rc; 461 462 rc = recvfrom(dev->backend_udp_sock, buf, buflen, 0, 463 (struct sockaddr *) &dev->backend_udp_dest, 464 (socklen_t *)&slen); 465 if (rc == -1) { 466 vubr_die("recvfrom()"); 467 } 468 469 return rc; 470 } 471 472 static void 473 vubr_consume_raw_packet(VubrDev *dev, uint8_t *buf, uint32_t len) 474 { 475 int hdrlen = dev->hdrlen; 476 DPRINT(" hdrlen = %d\n", dev->hdrlen); 477 478 if (VHOST_USER_BRIDGE_DEBUG) { 479 print_buffer(buf, len); 480 } 481 vubr_backend_udp_sendbuf(dev, buf + hdrlen, len - hdrlen); 482 } 483 484 /* Kick the log_call_fd if required. */ 485 static void 486 vubr_log_kick(VubrDev *dev) 487 { 488 if (dev->log_call_fd != -1) { 489 DPRINT("Kicking the QEMU's log...\n"); 490 eventfd_write(dev->log_call_fd, 1); 491 } 492 } 493 494 /* Kick the guest if necessary. */ 495 static void 496 vubr_virtqueue_kick(VubrVirtq *vq) 497 { 498 if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)) { 499 DPRINT("Kicking the guest...\n"); 500 eventfd_write(vq->call_fd, 1); 501 } 502 } 503 504 static void 505 vubr_log_page(uint8_t *log_table, uint64_t page) 506 { 507 DPRINT("Logged dirty guest page: %"PRId64"\n", page); 508 atomic_or(&log_table[page / 8], 1 << (page % 8)); 509 } 510 511 static void 512 vubr_log_write(VubrDev *dev, uint64_t address, uint64_t length) 513 { 514 uint64_t page; 515 516 if (!(dev->features & (1ULL << VHOST_F_LOG_ALL)) || 517 !dev->log_table || !length) { 518 return; 519 } 520 521 assert(dev->log_size > ((address + length - 1) / VHOST_LOG_PAGE / 8)); 522 523 page = address / VHOST_LOG_PAGE; 524 while (page * VHOST_LOG_PAGE < address + length) { 525 vubr_log_page(dev->log_table, page); 526 page += VHOST_LOG_PAGE; 527 } 528 vubr_log_kick(dev); 529 } 530 531 static void 532 vubr_post_buffer(VubrDev *dev, VubrVirtq *vq, uint8_t *buf, int32_t len) 533 { 534 struct vring_desc *desc = vq->desc; 535 struct vring_avail *avail = vq->avail; 536 struct vring_used *used = vq->used; 537 uint64_t log_guest_addr = vq->log_guest_addr; 538 int32_t remaining_len = len; 539 540 unsigned int size = vq->size; 541 542 uint16_t avail_index = atomic_mb_read(&avail->idx); 543 544 /* We check the available descriptors before posting the 545 * buffer, so here we assume that enough available 546 * descriptors. */ 547 assert(vq->last_avail_index != avail_index); 548 uint16_t a_index = vq->last_avail_index % size; 549 uint16_t u_index = vq->last_used_index % size; 550 uint16_t d_index = avail->ring[a_index]; 551 552 int i = d_index; 553 uint32_t written_len = 0; 554 555 do { 556 DPRINT("Post packet to guest on vq:\n"); 557 DPRINT(" size = %d\n", vq->size); 558 DPRINT(" last_avail_index = %d\n", vq->last_avail_index); 559 DPRINT(" last_used_index = %d\n", vq->last_used_index); 560 DPRINT(" a_index = %d\n", a_index); 561 DPRINT(" u_index = %d\n", u_index); 562 DPRINT(" d_index = %d\n", d_index); 563 DPRINT(" desc[%d].addr = 0x%016"PRIx64"\n", i, desc[i].addr); 564 DPRINT(" desc[%d].len = %d\n", i, desc[i].len); 565 DPRINT(" desc[%d].flags = %d\n", i, desc[i].flags); 566 DPRINT(" avail->idx = %d\n", avail_index); 567 DPRINT(" used->idx = %d\n", used->idx); 568 569 if (!(desc[i].flags & VRING_DESC_F_WRITE)) { 570 /* FIXME: we should find writable descriptor. */ 571 fprintf(stderr, "Error: descriptor is not writable. Exiting.\n"); 572 exit(1); 573 } 574 575 void *chunk_start = (void *)(uintptr_t)gpa_to_va(dev, desc[i].addr); 576 uint32_t chunk_len = desc[i].len; 577 uint32_t chunk_write_len = MIN(remaining_len, chunk_len); 578 579 memcpy(chunk_start, buf + written_len, chunk_write_len); 580 vubr_log_write(dev, desc[i].addr, chunk_write_len); 581 remaining_len -= chunk_write_len; 582 written_len += chunk_write_len; 583 584 if ((remaining_len == 0) || !(desc[i].flags & VRING_DESC_F_NEXT)) { 585 break; 586 } 587 588 i = desc[i].next; 589 } while (1); 590 591 if (remaining_len > 0) { 592 fprintf(stderr, 593 "Too long packet for RX, remaining_len = %d, Dropping...\n", 594 remaining_len); 595 return; 596 } 597 598 /* Add descriptor to the used ring. */ 599 used->ring[u_index].id = d_index; 600 used->ring[u_index].len = len; 601 vubr_log_write(dev, 602 log_guest_addr + offsetof(struct vring_used, ring[u_index]), 603 sizeof(used->ring[u_index])); 604 605 vq->last_avail_index++; 606 vq->last_used_index++; 607 608 atomic_mb_set(&used->idx, vq->last_used_index); 609 vubr_log_write(dev, 610 log_guest_addr + offsetof(struct vring_used, idx), 611 sizeof(used->idx)); 612 613 /* Kick the guest if necessary. */ 614 vubr_virtqueue_kick(vq); 615 } 616 617 static int 618 vubr_process_desc(VubrDev *dev, VubrVirtq *vq) 619 { 620 struct vring_desc *desc = vq->desc; 621 struct vring_avail *avail = vq->avail; 622 struct vring_used *used = vq->used; 623 uint64_t log_guest_addr = vq->log_guest_addr; 624 625 unsigned int size = vq->size; 626 627 uint16_t a_index = vq->last_avail_index % size; 628 uint16_t u_index = vq->last_used_index % size; 629 uint16_t d_index = avail->ring[a_index]; 630 631 uint32_t i, len = 0; 632 size_t buf_size = 4096; 633 uint8_t buf[4096]; 634 635 DPRINT("Chunks: "); 636 i = d_index; 637 do { 638 void *chunk_start = (void *)(uintptr_t)gpa_to_va(dev, desc[i].addr); 639 uint32_t chunk_len = desc[i].len; 640 641 assert(!(desc[i].flags & VRING_DESC_F_WRITE)); 642 643 if (len + chunk_len < buf_size) { 644 memcpy(buf + len, chunk_start, chunk_len); 645 DPRINT("%d ", chunk_len); 646 } else { 647 fprintf(stderr, "Error: too long packet. Dropping...\n"); 648 break; 649 } 650 651 len += chunk_len; 652 653 if (!(desc[i].flags & VRING_DESC_F_NEXT)) { 654 break; 655 } 656 657 i = desc[i].next; 658 } while (1); 659 DPRINT("\n"); 660 661 if (!len) { 662 return -1; 663 } 664 665 /* Add descriptor to the used ring. */ 666 used->ring[u_index].id = d_index; 667 used->ring[u_index].len = len; 668 vubr_log_write(dev, 669 log_guest_addr + offsetof(struct vring_used, ring[u_index]), 670 sizeof(used->ring[u_index])); 671 672 vubr_consume_raw_packet(dev, buf, len); 673 674 return 0; 675 } 676 677 static void 678 vubr_process_avail(VubrDev *dev, VubrVirtq *vq) 679 { 680 struct vring_avail *avail = vq->avail; 681 struct vring_used *used = vq->used; 682 uint64_t log_guest_addr = vq->log_guest_addr; 683 684 while (vq->last_avail_index != atomic_mb_read(&avail->idx)) { 685 vubr_process_desc(dev, vq); 686 vq->last_avail_index++; 687 vq->last_used_index++; 688 } 689 690 atomic_mb_set(&used->idx, vq->last_used_index); 691 vubr_log_write(dev, 692 log_guest_addr + offsetof(struct vring_used, idx), 693 sizeof(used->idx)); 694 } 695 696 static void 697 vubr_backend_recv_cb(int sock, void *ctx) 698 { 699 VubrDev *dev = (VubrDev *) ctx; 700 VubrVirtq *rx_vq = &dev->vq[0]; 701 uint8_t buf[4096]; 702 struct virtio_net_hdr_v1 *hdr = (struct virtio_net_hdr_v1 *)buf; 703 int hdrlen = dev->hdrlen; 704 int buflen = sizeof(buf); 705 int len; 706 707 if (!dev->ready) { 708 return; 709 } 710 711 DPRINT("\n\n *** IN UDP RECEIVE CALLBACK ***\n\n"); 712 DPRINT(" hdrlen = %d\n", hdrlen); 713 714 uint16_t avail_index = atomic_mb_read(&rx_vq->avail->idx); 715 716 /* If there is no available descriptors, just do nothing. 717 * The buffer will be handled by next arrived UDP packet, 718 * or next kick on receive virtq. */ 719 if (rx_vq->last_avail_index == avail_index) { 720 DPRINT("Got UDP packet, but no available descriptors on RX virtq.\n"); 721 return; 722 } 723 724 memset(buf, 0, hdrlen); 725 /* TODO: support mergeable buffers. */ 726 if (hdrlen == 12) 727 hdr->num_buffers = 1; 728 len = vubr_backend_udp_recvbuf(dev, buf + hdrlen, buflen - hdrlen); 729 730 vubr_post_buffer(dev, rx_vq, buf, len + hdrlen); 731 } 732 733 static void 734 vubr_kick_cb(int sock, void *ctx) 735 { 736 VubrDev *dev = (VubrDev *) ctx; 737 eventfd_t kick_data; 738 ssize_t rc; 739 740 rc = eventfd_read(sock, &kick_data); 741 if (rc == -1) { 742 vubr_die("eventfd_read()"); 743 } else { 744 DPRINT("Got kick_data: %016"PRIx64"\n", kick_data); 745 vubr_process_avail(dev, &dev->vq[1]); 746 } 747 } 748 749 static int 750 vubr_none_exec(VubrDev *dev, VhostUserMsg *vmsg) 751 { 752 DPRINT("Function %s() not implemented yet.\n", __func__); 753 return 0; 754 } 755 756 static int 757 vubr_get_features_exec(VubrDev *dev, VhostUserMsg *vmsg) 758 { 759 vmsg->payload.u64 = 760 ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | 761 (1ULL << VHOST_F_LOG_ALL) | 762 (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | 763 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)); 764 765 vmsg->size = sizeof(vmsg->payload.u64); 766 767 DPRINT("Sending back to guest u64: 0x%016"PRIx64"\n", vmsg->payload.u64); 768 769 /* Reply */ 770 return 1; 771 } 772 773 static int 774 vubr_set_features_exec(VubrDev *dev, VhostUserMsg *vmsg) 775 { 776 DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); 777 778 dev->features = vmsg->payload.u64; 779 if ((dev->features & (1ULL << VIRTIO_F_VERSION_1)) || 780 (dev->features & (1ULL << VIRTIO_NET_F_MRG_RXBUF))) { 781 dev->hdrlen = 12; 782 } else { 783 dev->hdrlen = 10; 784 } 785 786 return 0; 787 } 788 789 static int 790 vubr_set_owner_exec(VubrDev *dev, VhostUserMsg *vmsg) 791 { 792 return 0; 793 } 794 795 static void 796 vubr_close_log(VubrDev *dev) 797 { 798 if (dev->log_table) { 799 if (munmap(dev->log_table, dev->log_size) != 0) { 800 vubr_die("munmap()"); 801 } 802 803 dev->log_table = 0; 804 } 805 if (dev->log_call_fd != -1) { 806 close(dev->log_call_fd); 807 dev->log_call_fd = -1; 808 } 809 } 810 811 static int 812 vubr_reset_device_exec(VubrDev *dev, VhostUserMsg *vmsg) 813 { 814 vubr_close_log(dev); 815 dev->ready = 0; 816 dev->features = 0; 817 return 0; 818 } 819 820 static int 821 vubr_set_mem_table_exec(VubrDev *dev, VhostUserMsg *vmsg) 822 { 823 int i; 824 VhostUserMemory *memory = &vmsg->payload.memory; 825 dev->nregions = memory->nregions; 826 827 DPRINT("Nregions: %d\n", memory->nregions); 828 for (i = 0; i < dev->nregions; i++) { 829 void *mmap_addr; 830 VhostUserMemoryRegion *msg_region = &memory->regions[i]; 831 VubrDevRegion *dev_region = &dev->regions[i]; 832 833 DPRINT("Region %d\n", i); 834 DPRINT(" guest_phys_addr: 0x%016"PRIx64"\n", 835 msg_region->guest_phys_addr); 836 DPRINT(" memory_size: 0x%016"PRIx64"\n", 837 msg_region->memory_size); 838 DPRINT(" userspace_addr 0x%016"PRIx64"\n", 839 msg_region->userspace_addr); 840 DPRINT(" mmap_offset 0x%016"PRIx64"\n", 841 msg_region->mmap_offset); 842 843 dev_region->gpa = msg_region->guest_phys_addr; 844 dev_region->size = msg_region->memory_size; 845 dev_region->qva = msg_region->userspace_addr; 846 dev_region->mmap_offset = msg_region->mmap_offset; 847 848 /* We don't use offset argument of mmap() since the 849 * mapped address has to be page aligned, and we use huge 850 * pages. */ 851 mmap_addr = mmap(0, dev_region->size + dev_region->mmap_offset, 852 PROT_READ | PROT_WRITE, MAP_SHARED, 853 vmsg->fds[i], 0); 854 855 if (mmap_addr == MAP_FAILED) { 856 vubr_die("mmap"); 857 } 858 dev_region->mmap_addr = (uint64_t)(uintptr_t)mmap_addr; 859 DPRINT(" mmap_addr: 0x%016"PRIx64"\n", dev_region->mmap_addr); 860 861 close(vmsg->fds[i]); 862 } 863 864 return 0; 865 } 866 867 static int 868 vubr_set_log_base_exec(VubrDev *dev, VhostUserMsg *vmsg) 869 { 870 int fd; 871 uint64_t log_mmap_size, log_mmap_offset; 872 void *rc; 873 874 assert(vmsg->fd_num == 1); 875 fd = vmsg->fds[0]; 876 877 assert(vmsg->size == sizeof(vmsg->payload.log)); 878 log_mmap_offset = vmsg->payload.log.mmap_offset; 879 log_mmap_size = vmsg->payload.log.mmap_size; 880 DPRINT("Log mmap_offset: %"PRId64"\n", log_mmap_offset); 881 DPRINT("Log mmap_size: %"PRId64"\n", log_mmap_size); 882 883 rc = mmap(0, log_mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 884 log_mmap_offset); 885 if (rc == MAP_FAILED) { 886 vubr_die("mmap"); 887 } 888 dev->log_table = rc; 889 dev->log_size = log_mmap_size; 890 891 vmsg->size = sizeof(vmsg->payload.u64); 892 /* Reply */ 893 return 1; 894 } 895 896 static int 897 vubr_set_log_fd_exec(VubrDev *dev, VhostUserMsg *vmsg) 898 { 899 assert(vmsg->fd_num == 1); 900 dev->log_call_fd = vmsg->fds[0]; 901 DPRINT("Got log_call_fd: %d\n", vmsg->fds[0]); 902 return 0; 903 } 904 905 static int 906 vubr_set_vring_num_exec(VubrDev *dev, VhostUserMsg *vmsg) 907 { 908 unsigned int index = vmsg->payload.state.index; 909 unsigned int num = vmsg->payload.state.num; 910 911 DPRINT("State.index: %d\n", index); 912 DPRINT("State.num: %d\n", num); 913 dev->vq[index].size = num; 914 return 0; 915 } 916 917 static int 918 vubr_set_vring_addr_exec(VubrDev *dev, VhostUserMsg *vmsg) 919 { 920 struct vhost_vring_addr *vra = &vmsg->payload.addr; 921 unsigned int index = vra->index; 922 VubrVirtq *vq = &dev->vq[index]; 923 924 DPRINT("vhost_vring_addr:\n"); 925 DPRINT(" index: %d\n", vra->index); 926 DPRINT(" flags: %d\n", vra->flags); 927 DPRINT(" desc_user_addr: 0x%016llx\n", vra->desc_user_addr); 928 DPRINT(" used_user_addr: 0x%016llx\n", vra->used_user_addr); 929 DPRINT(" avail_user_addr: 0x%016llx\n", vra->avail_user_addr); 930 DPRINT(" log_guest_addr: 0x%016llx\n", vra->log_guest_addr); 931 932 vq->desc = (struct vring_desc *)(uintptr_t)qva_to_va(dev, vra->desc_user_addr); 933 vq->used = (struct vring_used *)(uintptr_t)qva_to_va(dev, vra->used_user_addr); 934 vq->avail = (struct vring_avail *)(uintptr_t)qva_to_va(dev, vra->avail_user_addr); 935 vq->log_guest_addr = vra->log_guest_addr; 936 937 DPRINT("Setting virtq addresses:\n"); 938 DPRINT(" vring_desc at %p\n", vq->desc); 939 DPRINT(" vring_used at %p\n", vq->used); 940 DPRINT(" vring_avail at %p\n", vq->avail); 941 942 vq->last_used_index = vq->used->idx; 943 944 if (vq->last_avail_index != vq->used->idx) { 945 DPRINT("Last avail index != used index: %d != %d, resuming", 946 vq->last_avail_index, vq->used->idx); 947 vq->last_avail_index = vq->used->idx; 948 } 949 950 return 0; 951 } 952 953 static int 954 vubr_set_vring_base_exec(VubrDev *dev, VhostUserMsg *vmsg) 955 { 956 unsigned int index = vmsg->payload.state.index; 957 unsigned int num = vmsg->payload.state.num; 958 959 DPRINT("State.index: %d\n", index); 960 DPRINT("State.num: %d\n", num); 961 dev->vq[index].last_avail_index = num; 962 963 return 0; 964 } 965 966 static int 967 vubr_get_vring_base_exec(VubrDev *dev, VhostUserMsg *vmsg) 968 { 969 unsigned int index = vmsg->payload.state.index; 970 971 DPRINT("State.index: %d\n", index); 972 vmsg->payload.state.num = dev->vq[index].last_avail_index; 973 vmsg->size = sizeof(vmsg->payload.state); 974 /* FIXME: this is a work-around for a bug in QEMU enabling 975 * too early vrings. When protocol features are enabled, 976 * we have to respect * VHOST_USER_SET_VRING_ENABLE request. */ 977 dev->ready = 0; 978 979 if (dev->vq[index].call_fd != -1) { 980 close(dev->vq[index].call_fd); 981 dev->vq[index].call_fd = -1; 982 } 983 if (dev->vq[index].kick_fd != -1) { 984 close(dev->vq[index].kick_fd); 985 dispatcher_remove(&dev->dispatcher, dev->vq[index].kick_fd); 986 dev->vq[index].kick_fd = -1; 987 } 988 989 /* Reply */ 990 return 1; 991 } 992 993 static int 994 vubr_set_vring_kick_exec(VubrDev *dev, VhostUserMsg *vmsg) 995 { 996 uint64_t u64_arg = vmsg->payload.u64; 997 int index = u64_arg & VHOST_USER_VRING_IDX_MASK; 998 999 DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); 1000 1001 assert((u64_arg & VHOST_USER_VRING_NOFD_MASK) == 0); 1002 assert(vmsg->fd_num == 1); 1003 1004 if (dev->vq[index].kick_fd != -1) { 1005 close(dev->vq[index].kick_fd); 1006 dispatcher_remove(&dev->dispatcher, dev->vq[index].kick_fd); 1007 } 1008 dev->vq[index].kick_fd = vmsg->fds[0]; 1009 DPRINT("Got kick_fd: %d for vq: %d\n", vmsg->fds[0], index); 1010 1011 if (index % 2 == 1) { 1012 /* TX queue. */ 1013 dispatcher_add(&dev->dispatcher, dev->vq[index].kick_fd, 1014 dev, vubr_kick_cb); 1015 1016 DPRINT("Waiting for kicks on fd: %d for vq: %d\n", 1017 dev->vq[index].kick_fd, index); 1018 } 1019 /* We temporarily use this hack to determine that both TX and RX 1020 * queues are set up and ready for processing. 1021 * FIXME: we need to rely in VHOST_USER_SET_VRING_ENABLE and 1022 * actual kicks. */ 1023 if (dev->vq[0].kick_fd != -1 && 1024 dev->vq[1].kick_fd != -1) { 1025 dev->ready = 1; 1026 DPRINT("vhost-user-bridge is ready for processing queues.\n"); 1027 } 1028 return 0; 1029 1030 } 1031 1032 static int 1033 vubr_set_vring_call_exec(VubrDev *dev, VhostUserMsg *vmsg) 1034 { 1035 uint64_t u64_arg = vmsg->payload.u64; 1036 int index = u64_arg & VHOST_USER_VRING_IDX_MASK; 1037 1038 DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); 1039 assert((u64_arg & VHOST_USER_VRING_NOFD_MASK) == 0); 1040 assert(vmsg->fd_num == 1); 1041 1042 if (dev->vq[index].call_fd != -1) { 1043 close(dev->vq[index].call_fd); 1044 } 1045 dev->vq[index].call_fd = vmsg->fds[0]; 1046 DPRINT("Got call_fd: %d for vq: %d\n", vmsg->fds[0], index); 1047 1048 return 0; 1049 } 1050 1051 static int 1052 vubr_set_vring_err_exec(VubrDev *dev, VhostUserMsg *vmsg) 1053 { 1054 DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); 1055 return 0; 1056 } 1057 1058 static int 1059 vubr_get_protocol_features_exec(VubrDev *dev, VhostUserMsg *vmsg) 1060 { 1061 vmsg->payload.u64 = 1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD; 1062 DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); 1063 vmsg->size = sizeof(vmsg->payload.u64); 1064 1065 /* Reply */ 1066 return 1; 1067 } 1068 1069 static int 1070 vubr_set_protocol_features_exec(VubrDev *dev, VhostUserMsg *vmsg) 1071 { 1072 /* FIXME: unimplented */ 1073 DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); 1074 return 0; 1075 } 1076 1077 static int 1078 vubr_get_queue_num_exec(VubrDev *dev, VhostUserMsg *vmsg) 1079 { 1080 DPRINT("Function %s() not implemented yet.\n", __func__); 1081 return 0; 1082 } 1083 1084 static int 1085 vubr_set_vring_enable_exec(VubrDev *dev, VhostUserMsg *vmsg) 1086 { 1087 unsigned int index = vmsg->payload.state.index; 1088 unsigned int enable = vmsg->payload.state.num; 1089 1090 DPRINT("State.index: %d\n", index); 1091 DPRINT("State.enable: %d\n", enable); 1092 dev->vq[index].enable = enable; 1093 return 0; 1094 } 1095 1096 static int 1097 vubr_send_rarp_exec(VubrDev *dev, VhostUserMsg *vmsg) 1098 { 1099 DPRINT("Function %s() not implemented yet.\n", __func__); 1100 return 0; 1101 } 1102 1103 static int 1104 vubr_execute_request(VubrDev *dev, VhostUserMsg *vmsg) 1105 { 1106 /* Print out generic part of the request. */ 1107 DPRINT( 1108 "================== Vhost user message from QEMU ==================\n"); 1109 DPRINT("Request: %s (%d)\n", vubr_request_str[vmsg->request], 1110 vmsg->request); 1111 DPRINT("Flags: 0x%x\n", vmsg->flags); 1112 DPRINT("Size: %d\n", vmsg->size); 1113 1114 if (vmsg->fd_num) { 1115 int i; 1116 DPRINT("Fds:"); 1117 for (i = 0; i < vmsg->fd_num; i++) { 1118 DPRINT(" %d", vmsg->fds[i]); 1119 } 1120 DPRINT("\n"); 1121 } 1122 1123 switch (vmsg->request) { 1124 case VHOST_USER_NONE: 1125 return vubr_none_exec(dev, vmsg); 1126 case VHOST_USER_GET_FEATURES: 1127 return vubr_get_features_exec(dev, vmsg); 1128 case VHOST_USER_SET_FEATURES: 1129 return vubr_set_features_exec(dev, vmsg); 1130 case VHOST_USER_SET_OWNER: 1131 return vubr_set_owner_exec(dev, vmsg); 1132 case VHOST_USER_RESET_OWNER: 1133 return vubr_reset_device_exec(dev, vmsg); 1134 case VHOST_USER_SET_MEM_TABLE: 1135 return vubr_set_mem_table_exec(dev, vmsg); 1136 case VHOST_USER_SET_LOG_BASE: 1137 return vubr_set_log_base_exec(dev, vmsg); 1138 case VHOST_USER_SET_LOG_FD: 1139 return vubr_set_log_fd_exec(dev, vmsg); 1140 case VHOST_USER_SET_VRING_NUM: 1141 return vubr_set_vring_num_exec(dev, vmsg); 1142 case VHOST_USER_SET_VRING_ADDR: 1143 return vubr_set_vring_addr_exec(dev, vmsg); 1144 case VHOST_USER_SET_VRING_BASE: 1145 return vubr_set_vring_base_exec(dev, vmsg); 1146 case VHOST_USER_GET_VRING_BASE: 1147 return vubr_get_vring_base_exec(dev, vmsg); 1148 case VHOST_USER_SET_VRING_KICK: 1149 return vubr_set_vring_kick_exec(dev, vmsg); 1150 case VHOST_USER_SET_VRING_CALL: 1151 return vubr_set_vring_call_exec(dev, vmsg); 1152 case VHOST_USER_SET_VRING_ERR: 1153 return vubr_set_vring_err_exec(dev, vmsg); 1154 case VHOST_USER_GET_PROTOCOL_FEATURES: 1155 return vubr_get_protocol_features_exec(dev, vmsg); 1156 case VHOST_USER_SET_PROTOCOL_FEATURES: 1157 return vubr_set_protocol_features_exec(dev, vmsg); 1158 case VHOST_USER_GET_QUEUE_NUM: 1159 return vubr_get_queue_num_exec(dev, vmsg); 1160 case VHOST_USER_SET_VRING_ENABLE: 1161 return vubr_set_vring_enable_exec(dev, vmsg); 1162 case VHOST_USER_SEND_RARP: 1163 return vubr_send_rarp_exec(dev, vmsg); 1164 1165 case VHOST_USER_MAX: 1166 assert(vmsg->request != VHOST_USER_MAX); 1167 } 1168 return 0; 1169 } 1170 1171 static void 1172 vubr_receive_cb(int sock, void *ctx) 1173 { 1174 VubrDev *dev = (VubrDev *) ctx; 1175 VhostUserMsg vmsg; 1176 int reply_requested; 1177 1178 vubr_message_read(sock, &vmsg); 1179 reply_requested = vubr_execute_request(dev, &vmsg); 1180 if (reply_requested) { 1181 /* Set the version in the flags when sending the reply */ 1182 vmsg.flags &= ~VHOST_USER_VERSION_MASK; 1183 vmsg.flags |= VHOST_USER_VERSION; 1184 vmsg.flags |= VHOST_USER_REPLY_MASK; 1185 vubr_message_write(sock, &vmsg); 1186 } 1187 } 1188 1189 static void 1190 vubr_accept_cb(int sock, void *ctx) 1191 { 1192 VubrDev *dev = (VubrDev *)ctx; 1193 int conn_fd; 1194 struct sockaddr_un un; 1195 socklen_t len = sizeof(un); 1196 1197 conn_fd = accept(sock, (struct sockaddr *) &un, &len); 1198 if (conn_fd == -1) { 1199 vubr_die("accept()"); 1200 } 1201 DPRINT("Got connection from remote peer on sock %d\n", conn_fd); 1202 dispatcher_add(&dev->dispatcher, conn_fd, ctx, vubr_receive_cb); 1203 dispatcher_remove(&dev->dispatcher, sock); 1204 } 1205 1206 static VubrDev * 1207 vubr_new(const char *path, bool client) 1208 { 1209 VubrDev *dev = (VubrDev *) calloc(1, sizeof(VubrDev)); 1210 dev->nregions = 0; 1211 int i; 1212 struct sockaddr_un un; 1213 CallbackFunc cb; 1214 size_t len; 1215 1216 for (i = 0; i < MAX_NR_VIRTQUEUE; i++) { 1217 dev->vq[i] = (VubrVirtq) { 1218 .call_fd = -1, .kick_fd = -1, 1219 .size = 0, 1220 .last_avail_index = 0, .last_used_index = 0, 1221 .desc = 0, .avail = 0, .used = 0, 1222 .enable = 0, 1223 }; 1224 } 1225 1226 /* Init log */ 1227 dev->log_call_fd = -1; 1228 dev->log_size = 0; 1229 dev->log_table = 0; 1230 dev->ready = 0; 1231 dev->features = 0; 1232 1233 /* Get a UNIX socket. */ 1234 dev->sock = socket(AF_UNIX, SOCK_STREAM, 0); 1235 if (dev->sock == -1) { 1236 vubr_die("socket"); 1237 } 1238 1239 un.sun_family = AF_UNIX; 1240 strcpy(un.sun_path, path); 1241 len = sizeof(un.sun_family) + strlen(path); 1242 1243 if (!client) { 1244 unlink(path); 1245 1246 if (bind(dev->sock, (struct sockaddr *) &un, len) == -1) { 1247 vubr_die("bind"); 1248 } 1249 1250 if (listen(dev->sock, 1) == -1) { 1251 vubr_die("listen"); 1252 } 1253 cb = vubr_accept_cb; 1254 1255 DPRINT("Waiting for connections on UNIX socket %s ...\n", path); 1256 } else { 1257 if (connect(dev->sock, (struct sockaddr *)&un, len) == -1) { 1258 vubr_die("connect"); 1259 } 1260 cb = vubr_receive_cb; 1261 } 1262 1263 dispatcher_init(&dev->dispatcher); 1264 dispatcher_add(&dev->dispatcher, dev->sock, (void *)dev, cb); 1265 1266 return dev; 1267 } 1268 1269 static void 1270 vubr_set_host(struct sockaddr_in *saddr, const char *host) 1271 { 1272 if (isdigit(host[0])) { 1273 if (!inet_aton(host, &saddr->sin_addr)) { 1274 fprintf(stderr, "inet_aton() failed.\n"); 1275 exit(1); 1276 } 1277 } else { 1278 struct hostent *he = gethostbyname(host); 1279 1280 if (!he) { 1281 fprintf(stderr, "gethostbyname() failed.\n"); 1282 exit(1); 1283 } 1284 saddr->sin_addr = *(struct in_addr *)he->h_addr; 1285 } 1286 } 1287 1288 static void 1289 vubr_backend_udp_setup(VubrDev *dev, 1290 const char *local_host, 1291 const char *local_port, 1292 const char *remote_host, 1293 const char *remote_port) 1294 { 1295 int sock; 1296 const char *r; 1297 1298 int lport, rport; 1299 1300 lport = strtol(local_port, (char **)&r, 0); 1301 if (r == local_port) { 1302 fprintf(stderr, "lport parsing failed.\n"); 1303 exit(1); 1304 } 1305 1306 rport = strtol(remote_port, (char **)&r, 0); 1307 if (r == remote_port) { 1308 fprintf(stderr, "rport parsing failed.\n"); 1309 exit(1); 1310 } 1311 1312 struct sockaddr_in si_local = { 1313 .sin_family = AF_INET, 1314 .sin_port = htons(lport), 1315 }; 1316 1317 vubr_set_host(&si_local, local_host); 1318 1319 /* setup destination for sends */ 1320 dev->backend_udp_dest = (struct sockaddr_in) { 1321 .sin_family = AF_INET, 1322 .sin_port = htons(rport), 1323 }; 1324 vubr_set_host(&dev->backend_udp_dest, remote_host); 1325 1326 sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); 1327 if (sock == -1) { 1328 vubr_die("socket"); 1329 } 1330 1331 if (bind(sock, (struct sockaddr *)&si_local, sizeof(si_local)) == -1) { 1332 vubr_die("bind"); 1333 } 1334 1335 dev->backend_udp_sock = sock; 1336 dispatcher_add(&dev->dispatcher, sock, dev, vubr_backend_recv_cb); 1337 DPRINT("Waiting for data from udp backend on %s:%d...\n", 1338 local_host, lport); 1339 } 1340 1341 static void 1342 vubr_run(VubrDev *dev) 1343 { 1344 while (1) { 1345 /* timeout 200ms */ 1346 dispatcher_wait(&dev->dispatcher, 200000); 1347 /* Here one can try polling strategy. */ 1348 } 1349 } 1350 1351 static int 1352 vubr_parse_host_port(const char **host, const char **port, const char *buf) 1353 { 1354 char *p = strchr(buf, ':'); 1355 1356 if (!p) { 1357 return -1; 1358 } 1359 *p = '\0'; 1360 *host = strdup(buf); 1361 *port = strdup(p + 1); 1362 return 0; 1363 } 1364 1365 #define DEFAULT_UD_SOCKET "/tmp/vubr.sock" 1366 #define DEFAULT_LHOST "127.0.0.1" 1367 #define DEFAULT_LPORT "4444" 1368 #define DEFAULT_RHOST "127.0.0.1" 1369 #define DEFAULT_RPORT "5555" 1370 1371 static const char *ud_socket_path = DEFAULT_UD_SOCKET; 1372 static const char *lhost = DEFAULT_LHOST; 1373 static const char *lport = DEFAULT_LPORT; 1374 static const char *rhost = DEFAULT_RHOST; 1375 static const char *rport = DEFAULT_RPORT; 1376 1377 int 1378 main(int argc, char *argv[]) 1379 { 1380 VubrDev *dev; 1381 int opt; 1382 bool client = false; 1383 1384 while ((opt = getopt(argc, argv, "l:r:u:c")) != -1) { 1385 1386 switch (opt) { 1387 case 'l': 1388 if (vubr_parse_host_port(&lhost, &lport, optarg) < 0) { 1389 goto out; 1390 } 1391 break; 1392 case 'r': 1393 if (vubr_parse_host_port(&rhost, &rport, optarg) < 0) { 1394 goto out; 1395 } 1396 break; 1397 case 'u': 1398 ud_socket_path = strdup(optarg); 1399 break; 1400 case 'c': 1401 client = true; 1402 break; 1403 default: 1404 goto out; 1405 } 1406 } 1407 1408 DPRINT("ud socket: %s (%s)\n", ud_socket_path, 1409 client ? "client" : "server"); 1410 DPRINT("local: %s:%s\n", lhost, lport); 1411 DPRINT("remote: %s:%s\n", rhost, rport); 1412 1413 dev = vubr_new(ud_socket_path, client); 1414 if (!dev) { 1415 return 1; 1416 } 1417 1418 vubr_backend_udp_setup(dev, lhost, lport, rhost, rport); 1419 vubr_run(dev); 1420 return 0; 1421 1422 out: 1423 fprintf(stderr, "Usage: %s ", argv[0]); 1424 fprintf(stderr, "[-c] [-u ud_socket_path] [-l lhost:lport] [-r rhost:rport]\n"); 1425 fprintf(stderr, "\t-u path to unix doman socket. default: %s\n", 1426 DEFAULT_UD_SOCKET); 1427 fprintf(stderr, "\t-l local host and port. default: %s:%s\n", 1428 DEFAULT_LHOST, DEFAULT_LPORT); 1429 fprintf(stderr, "\t-r remote host and port. default: %s:%s\n", 1430 DEFAULT_RHOST, DEFAULT_RPORT); 1431 fprintf(stderr, "\t-c client mode\n"); 1432 1433 return 1; 1434 } 1435