1 /* 2 * QEMU System Emulator 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "qemu/log.h" 27 #include "net/slirp.h" 28 29 30 #if defined(CONFIG_SMBD_COMMAND) 31 #include <pwd.h> 32 #include <sys/wait.h> 33 #endif 34 #include "net/eth.h" 35 #include "net/net.h" 36 #include "clients.h" 37 #include "hub.h" 38 #include "monitor/monitor.h" 39 #include "qemu/error-report.h" 40 #include "qemu/sockets.h" 41 #include <libslirp.h> 42 #include "chardev/char-fe.h" 43 #include "system/system.h" 44 #include "qemu/cutils.h" 45 #include "qapi/error.h" 46 #include "qobject/qdict.h" 47 #include "util.h" 48 #include "migration/register.h" 49 #include "migration/vmstate.h" 50 #include "migration/qemu-file-types.h" 51 52 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 53 { 54 const char *p, *p1; 55 int len; 56 p = *pp; 57 p1 = strchr(p, sep); 58 if (!p1) 59 return -1; 60 len = p1 - p; 61 p1++; 62 if (buf_size > 0) { 63 if (len > buf_size - 1) 64 len = buf_size - 1; 65 memcpy(buf, p, len); 66 buf[len] = '\0'; 67 } 68 *pp = p1; 69 return 0; 70 } 71 72 /* slirp network adapter */ 73 74 #define SLIRP_CFG_HOSTFWD 1 75 76 struct slirp_config_str { 77 struct slirp_config_str *next; 78 int flags; 79 char str[1024]; 80 }; 81 82 struct GuestFwd { 83 CharBackend hd; 84 struct in_addr server; 85 int port; 86 Slirp *slirp; 87 }; 88 89 typedef struct SlirpState { 90 NetClientState nc; 91 QTAILQ_ENTRY(SlirpState) entry; 92 Slirp *slirp; 93 Notifier poll_notifier; 94 Notifier exit_notifier; 95 #if defined(CONFIG_SMBD_COMMAND) 96 gchar *smb_dir; 97 #endif 98 GSList *fwd; 99 } SlirpState; 100 101 static struct slirp_config_str *slirp_configs; 102 static QTAILQ_HEAD(, SlirpState) slirp_stacks = 103 QTAILQ_HEAD_INITIALIZER(slirp_stacks); 104 105 static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp); 106 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp); 107 108 #if defined(CONFIG_SMBD_COMMAND) 109 static int slirp_smb(SlirpState *s, const char *exported_dir, 110 struct in_addr vserver_addr, Error **errp); 111 static void slirp_smb_cleanup(SlirpState *s); 112 #else 113 static inline void slirp_smb_cleanup(SlirpState *s) { } 114 #endif 115 116 static ssize_t net_slirp_send_packet(const void *pkt, size_t pkt_len, 117 void *opaque) 118 { 119 SlirpState *s = opaque; 120 uint8_t min_pkt[ETH_ZLEN]; 121 size_t min_pktsz = sizeof(min_pkt); 122 123 if (net_peer_needs_padding(&s->nc)) { 124 if (eth_pad_short_frame(min_pkt, &min_pktsz, pkt, pkt_len)) { 125 pkt = min_pkt; 126 pkt_len = min_pktsz; 127 } 128 } 129 130 return qemu_send_packet(&s->nc, pkt, pkt_len); 131 } 132 133 static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size) 134 { 135 SlirpState *s = DO_UPCAST(SlirpState, nc, nc); 136 137 slirp_input(s->slirp, buf, size); 138 139 return size; 140 } 141 142 static void slirp_smb_exit(Notifier *n, void *data) 143 { 144 SlirpState *s = container_of(n, SlirpState, exit_notifier); 145 slirp_smb_cleanup(s); 146 } 147 148 static void slirp_free_fwd(gpointer data) 149 { 150 struct GuestFwd *fwd = data; 151 152 qemu_chr_fe_deinit(&fwd->hd, true); 153 g_free(data); 154 } 155 156 static void net_slirp_cleanup(NetClientState *nc) 157 { 158 SlirpState *s = DO_UPCAST(SlirpState, nc, nc); 159 160 g_slist_free_full(s->fwd, slirp_free_fwd); 161 main_loop_poll_remove_notifier(&s->poll_notifier); 162 unregister_savevm(NULL, "slirp", s->slirp); 163 slirp_cleanup(s->slirp); 164 if (s->exit_notifier.notify) { 165 qemu_remove_exit_notifier(&s->exit_notifier); 166 } 167 slirp_smb_cleanup(s); 168 QTAILQ_REMOVE(&slirp_stacks, s, entry); 169 } 170 171 static NetClientInfo net_slirp_info = { 172 .type = NET_CLIENT_DRIVER_USER, 173 .size = sizeof(SlirpState), 174 .receive = net_slirp_receive, 175 .cleanup = net_slirp_cleanup, 176 }; 177 178 static void net_slirp_guest_error(const char *msg, void *opaque) 179 { 180 qemu_log_mask(LOG_GUEST_ERROR, "%s", msg); 181 } 182 183 static int64_t net_slirp_clock_get_ns(void *opaque) 184 { 185 return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 186 } 187 188 typedef struct SlirpTimer SlirpTimer; 189 struct SlirpTimer { 190 QEMUTimer timer; 191 #if SLIRP_CHECK_VERSION(4,7,0) 192 Slirp *slirp; 193 SlirpTimerId id; 194 void *cb_opaque; 195 #endif 196 }; 197 198 #if SLIRP_CHECK_VERSION(4,7,0) 199 static void net_slirp_init_completed(Slirp *slirp, void *opaque) 200 { 201 SlirpState *s = opaque; 202 s->slirp = slirp; 203 } 204 205 static void net_slirp_timer_cb(void *opaque) 206 { 207 SlirpTimer *t = opaque; 208 slirp_handle_timer(t->slirp, t->id, t->cb_opaque); 209 } 210 211 static void *net_slirp_timer_new_opaque(SlirpTimerId id, 212 void *cb_opaque, void *opaque) 213 { 214 SlirpState *s = opaque; 215 SlirpTimer *t = g_new(SlirpTimer, 1); 216 t->slirp = s->slirp; 217 t->id = id; 218 t->cb_opaque = cb_opaque; 219 timer_init_full(&t->timer, NULL, QEMU_CLOCK_VIRTUAL, 220 SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL, 221 net_slirp_timer_cb, t); 222 return t; 223 } 224 #else 225 static void *net_slirp_timer_new(SlirpTimerCb cb, 226 void *cb_opaque, void *opaque) 227 { 228 SlirpTimer *t = g_new(SlirpTimer, 1); 229 timer_init_full(&t->timer, NULL, QEMU_CLOCK_VIRTUAL, 230 SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL, 231 cb, cb_opaque); 232 return t; 233 } 234 #endif 235 236 static void net_slirp_timer_free(void *timer, void *opaque) 237 { 238 SlirpTimer *t = timer; 239 timer_del(&t->timer); 240 g_free(t); 241 } 242 243 static void net_slirp_timer_mod(void *timer, int64_t expire_timer, 244 void *opaque) 245 { 246 SlirpTimer *t = timer; 247 timer_mod(&t->timer, expire_timer); 248 } 249 250 #if !SLIRP_CHECK_VERSION(4, 9, 0) 251 # define slirp_os_socket int 252 # define slirp_pollfds_fill_socket slirp_pollfds_fill 253 # define register_poll_socket register_poll_fd 254 # define unregister_poll_socket unregister_poll_fd 255 #endif 256 257 static void net_slirp_register_poll_sock(slirp_os_socket fd, void *opaque) 258 { 259 #ifdef WIN32 260 AioContext *ctxt = qemu_get_aio_context(); 261 262 if (WSAEventSelect(fd, event_notifier_get_handle(&ctxt->notifier), 263 FD_READ | FD_ACCEPT | FD_CLOSE | 264 FD_CONNECT | FD_WRITE | FD_OOB) != 0) { 265 error_setg_win32(&error_warn, WSAGetLastError(), "failed to WSAEventSelect()"); 266 } 267 #endif 268 } 269 270 static void net_slirp_unregister_poll_sock(slirp_os_socket fd, void *opaque) 271 { 272 #ifdef WIN32 273 if (WSAEventSelect(fd, NULL, 0) != 0) { 274 error_setg_win32(&error_warn, WSAGetLastError(), "failed to WSAEventSelect()"); 275 } 276 #endif 277 } 278 279 static void net_slirp_notify(void *opaque) 280 { 281 qemu_notify_event(); 282 } 283 284 static const SlirpCb slirp_cb = { 285 .send_packet = net_slirp_send_packet, 286 .guest_error = net_slirp_guest_error, 287 .clock_get_ns = net_slirp_clock_get_ns, 288 #if SLIRP_CHECK_VERSION(4,7,0) 289 .init_completed = net_slirp_init_completed, 290 .timer_new_opaque = net_slirp_timer_new_opaque, 291 #else 292 .timer_new = net_slirp_timer_new, 293 #endif 294 .timer_free = net_slirp_timer_free, 295 .timer_mod = net_slirp_timer_mod, 296 .register_poll_socket = net_slirp_register_poll_sock, 297 .unregister_poll_socket = net_slirp_unregister_poll_sock, 298 .notify = net_slirp_notify, 299 }; 300 301 static int slirp_poll_to_gio(int events) 302 { 303 int ret = 0; 304 305 if (events & SLIRP_POLL_IN) { 306 ret |= G_IO_IN; 307 } 308 if (events & SLIRP_POLL_OUT) { 309 ret |= G_IO_OUT; 310 } 311 if (events & SLIRP_POLL_PRI) { 312 ret |= G_IO_PRI; 313 } 314 if (events & SLIRP_POLL_ERR) { 315 ret |= G_IO_ERR; 316 } 317 if (events & SLIRP_POLL_HUP) { 318 ret |= G_IO_HUP; 319 } 320 321 return ret; 322 } 323 324 static int net_slirp_add_poll(slirp_os_socket fd, int events, void *opaque) 325 { 326 GArray *pollfds = opaque; 327 GPollFD pfd = { 328 .fd = fd, 329 .events = slirp_poll_to_gio(events), 330 }; 331 int idx = pollfds->len; 332 g_array_append_val(pollfds, pfd); 333 return idx; 334 } 335 336 static int slirp_gio_to_poll(int events) 337 { 338 int ret = 0; 339 340 if (events & G_IO_IN) { 341 ret |= SLIRP_POLL_IN; 342 } 343 if (events & G_IO_OUT) { 344 ret |= SLIRP_POLL_OUT; 345 } 346 if (events & G_IO_PRI) { 347 ret |= SLIRP_POLL_PRI; 348 } 349 if (events & G_IO_ERR) { 350 ret |= SLIRP_POLL_ERR; 351 } 352 if (events & G_IO_HUP) { 353 ret |= SLIRP_POLL_HUP; 354 } 355 356 return ret; 357 } 358 359 static int net_slirp_get_revents(int idx, void *opaque) 360 { 361 GArray *pollfds = opaque; 362 363 return slirp_gio_to_poll(g_array_index(pollfds, GPollFD, idx).revents); 364 } 365 366 static void net_slirp_poll_notify(Notifier *notifier, void *data) 367 { 368 MainLoopPoll *poll = data; 369 SlirpState *s = container_of(notifier, SlirpState, poll_notifier); 370 371 switch (poll->state) { 372 case MAIN_LOOP_POLL_FILL: 373 slirp_pollfds_fill_socket(s->slirp, &poll->timeout, 374 net_slirp_add_poll, poll->pollfds); 375 break; 376 case MAIN_LOOP_POLL_OK: 377 case MAIN_LOOP_POLL_ERR: 378 slirp_pollfds_poll(s->slirp, poll->state == MAIN_LOOP_POLL_ERR, 379 net_slirp_get_revents, poll->pollfds); 380 break; 381 default: 382 g_assert_not_reached(); 383 } 384 } 385 386 static ssize_t 387 net_slirp_stream_read(void *buf, size_t size, void *opaque) 388 { 389 QEMUFile *f = opaque; 390 391 return qemu_get_buffer(f, buf, size); 392 } 393 394 static ssize_t 395 net_slirp_stream_write(const void *buf, size_t size, void *opaque) 396 { 397 QEMUFile *f = opaque; 398 399 qemu_put_buffer(f, buf, size); 400 if (qemu_file_get_error(f)) { 401 return -1; 402 } 403 404 return size; 405 } 406 407 static int net_slirp_state_load(QEMUFile *f, void *opaque, int version_id) 408 { 409 Slirp *slirp = opaque; 410 411 return slirp_state_load(slirp, version_id, net_slirp_stream_read, f); 412 } 413 414 static void net_slirp_state_save(QEMUFile *f, void *opaque) 415 { 416 Slirp *slirp = opaque; 417 418 slirp_state_save(slirp, net_slirp_stream_write, f); 419 } 420 421 static SaveVMHandlers savevm_slirp_state = { 422 .save_state = net_slirp_state_save, 423 .load_state = net_slirp_state_load, 424 }; 425 426 static int net_slirp_init(NetClientState *peer, const char *model, 427 const char *name, int restricted, 428 bool ipv4, const char *vnetwork, const char *vhost, 429 bool ipv6, const char *vprefix6, int vprefix6_len, 430 const char *vhost6, 431 const char *vhostname, const char *tftp_export, 432 const char *bootfile, const char *vdhcp_start, 433 const char *vnameserver, const char *vnameserver6, 434 const char *smb_export, const char *vsmbserver, 435 const char **dnssearch, const char *vdomainname, 436 const char *tftp_server_name, 437 Error **errp) 438 { 439 /* default settings according to historic slirp */ 440 struct in_addr net = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */ 441 struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */ 442 struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */ 443 struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */ 444 struct in_addr dns = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */ 445 struct in6_addr ip6_prefix; 446 struct in6_addr ip6_host; 447 struct in6_addr ip6_dns; 448 #if defined(CONFIG_SMBD_COMMAND) 449 struct in_addr smbsrv = { .s_addr = 0 }; 450 #endif 451 SlirpConfig cfg = { 0 }; 452 NetClientState *nc; 453 SlirpState *s; 454 char buf[20]; 455 uint32_t addr; 456 int shift; 457 char *end; 458 struct slirp_config_str *config; 459 460 if (!ipv4 && (vnetwork || vhost || vnameserver)) { 461 error_setg(errp, "IPv4 disabled but netmask/host/dns provided"); 462 return -1; 463 } 464 465 if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) { 466 error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided"); 467 return -1; 468 } 469 470 if (!ipv4 && !ipv6) { 471 /* It doesn't make sense to disable both */ 472 error_setg(errp, "IPv4 and IPv6 disabled"); 473 return -1; 474 } 475 476 if (vnetwork) { 477 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) { 478 if (!inet_aton(vnetwork, &net)) { 479 error_setg(errp, "Failed to parse netmask"); 480 return -1; 481 } 482 addr = ntohl(net.s_addr); 483 if (!(addr & 0x80000000)) { 484 mask.s_addr = htonl(0xff000000); /* class A */ 485 } else if ((addr & 0xfff00000) == 0xac100000) { 486 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */ 487 } else if ((addr & 0xc0000000) == 0x80000000) { 488 mask.s_addr = htonl(0xffff0000); /* class B */ 489 } else if ((addr & 0xffff0000) == 0xc0a80000) { 490 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */ 491 } else if ((addr & 0xffff0000) == 0xc6120000) { 492 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */ 493 } else if ((addr & 0xe0000000) == 0xe0000000) { 494 mask.s_addr = htonl(0xffffff00); /* class C */ 495 } else { 496 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */ 497 } 498 } else { 499 if (!inet_aton(buf, &net)) { 500 error_setg(errp, "Failed to parse netmask"); 501 return -1; 502 } 503 shift = strtol(vnetwork, &end, 10); 504 if (*end != '\0') { 505 if (!inet_aton(vnetwork, &mask)) { 506 error_setg(errp, 507 "Failed to parse netmask (trailing chars)"); 508 return -1; 509 } 510 } else if (shift < 4 || shift > 32) { 511 error_setg(errp, 512 "Invalid netmask provided (must be in range 4-32)"); 513 return -1; 514 } else { 515 mask.s_addr = htonl(0xffffffff << (32 - shift)); 516 } 517 } 518 net.s_addr &= mask.s_addr; 519 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr); 520 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr); 521 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr); 522 } 523 524 if (vhost && !inet_aton(vhost, &host)) { 525 error_setg(errp, "Failed to parse host"); 526 return -1; 527 } 528 if ((host.s_addr & mask.s_addr) != net.s_addr) { 529 error_setg(errp, "Host doesn't belong to network"); 530 return -1; 531 } 532 533 if (vnameserver && !inet_aton(vnameserver, &dns)) { 534 error_setg(errp, "Failed to parse DNS"); 535 return -1; 536 } 537 if (restricted && (dns.s_addr & mask.s_addr) != net.s_addr) { 538 error_setg(errp, "DNS doesn't belong to network"); 539 return -1; 540 } 541 if (dns.s_addr == host.s_addr) { 542 error_setg(errp, "DNS must be different from host"); 543 return -1; 544 } 545 546 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) { 547 error_setg(errp, "Failed to parse DHCP start address"); 548 return -1; 549 } 550 if ((dhcp.s_addr & mask.s_addr) != net.s_addr) { 551 error_setg(errp, "DHCP doesn't belong to network"); 552 return -1; 553 } 554 if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) { 555 error_setg(errp, "DHCP must be different from host and DNS"); 556 return -1; 557 } 558 559 #if defined(CONFIG_SMBD_COMMAND) 560 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) { 561 error_setg(errp, "Failed to parse SMB address"); 562 return -1; 563 } 564 #endif 565 566 if (!vprefix6) { 567 vprefix6 = "fec0::"; 568 } 569 if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) { 570 error_setg(errp, "Failed to parse IPv6 prefix"); 571 return -1; 572 } 573 574 if (!vprefix6_len) { 575 vprefix6_len = 64; 576 } 577 if (vprefix6_len < 0 || vprefix6_len > 126) { 578 error_setg(errp, 579 "Invalid IPv6 prefix provided " 580 "(IPv6 prefix length must be between 0 and 126)"); 581 return -1; 582 } 583 584 if (vhost6) { 585 if (!inet_pton(AF_INET6, vhost6, &ip6_host)) { 586 error_setg(errp, "Failed to parse IPv6 host"); 587 return -1; 588 } 589 if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) { 590 error_setg(errp, "IPv6 Host doesn't belong to network"); 591 return -1; 592 } 593 } else { 594 ip6_host = ip6_prefix; 595 ip6_host.s6_addr[15] |= 2; 596 } 597 598 if (vnameserver6) { 599 if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) { 600 error_setg(errp, "Failed to parse IPv6 DNS"); 601 return -1; 602 } 603 if (restricted && !in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) { 604 error_setg(errp, "IPv6 DNS doesn't belong to network"); 605 return -1; 606 } 607 } else { 608 ip6_dns = ip6_prefix; 609 ip6_dns.s6_addr[15] |= 3; 610 } 611 612 if (vdomainname && !*vdomainname) { 613 error_setg(errp, "'domainname' parameter cannot be empty"); 614 return -1; 615 } 616 617 if (vdomainname && strlen(vdomainname) > 255) { 618 error_setg(errp, "'domainname' parameter cannot exceed 255 bytes"); 619 return -1; 620 } 621 622 if (vhostname && strlen(vhostname) > 255) { 623 error_setg(errp, "'vhostname' parameter cannot exceed 255 bytes"); 624 return -1; 625 } 626 627 if (tftp_server_name && strlen(tftp_server_name) > 255) { 628 error_setg(errp, "'tftp-server-name' parameter cannot exceed 255 bytes"); 629 return -1; 630 } 631 632 nc = qemu_new_net_client(&net_slirp_info, peer, model, name); 633 634 qemu_set_info_str(nc, "net=%s,restrict=%s", inet_ntoa(net), 635 restricted ? "on" : "off"); 636 637 s = DO_UPCAST(SlirpState, nc, nc); 638 639 cfg.version = 640 SLIRP_CHECK_VERSION(4, 9, 0) ? 6 : 641 SLIRP_CHECK_VERSION(4, 7, 0) ? 4 : 1; 642 cfg.restricted = restricted; 643 cfg.in_enabled = ipv4; 644 cfg.vnetwork = net; 645 cfg.vnetmask = mask; 646 cfg.vhost = host; 647 cfg.in6_enabled = ipv6; 648 cfg.vprefix_addr6 = ip6_prefix; 649 cfg.vprefix_len = vprefix6_len; 650 cfg.vhost6 = ip6_host; 651 cfg.vhostname = vhostname; 652 cfg.tftp_server_name = tftp_server_name; 653 cfg.tftp_path = tftp_export; 654 cfg.bootfile = bootfile; 655 cfg.vdhcp_start = dhcp; 656 cfg.vnameserver = dns; 657 cfg.vnameserver6 = ip6_dns; 658 cfg.vdnssearch = dnssearch; 659 cfg.vdomainname = vdomainname; 660 s->slirp = slirp_new(&cfg, &slirp_cb, s); 661 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry); 662 663 /* 664 * Make sure the current bitstream version of slirp is 4, to avoid 665 * QEMU migration incompatibilities, if upstream slirp bumped the 666 * version. 667 * 668 * FIXME: use bitfields of features? teach libslirp to save with 669 * specific version? 670 */ 671 g_assert(slirp_state_version() == 4); 672 register_savevm_live("slirp", VMSTATE_INSTANCE_ID_ANY, 673 slirp_state_version(), &savevm_slirp_state, s->slirp); 674 675 s->poll_notifier.notify = net_slirp_poll_notify; 676 main_loop_poll_add_notifier(&s->poll_notifier); 677 678 for (config = slirp_configs; config; config = config->next) { 679 if (config->flags & SLIRP_CFG_HOSTFWD) { 680 if (slirp_hostfwd(s, config->str, errp) < 0) { 681 goto error; 682 } 683 } else { 684 if (slirp_guestfwd(s, config->str, errp) < 0) { 685 goto error; 686 } 687 } 688 } 689 #if defined(CONFIG_SMBD_COMMAND) 690 if (smb_export) { 691 if (slirp_smb(s, smb_export, smbsrv, errp) < 0) { 692 goto error; 693 } 694 } 695 #endif 696 697 s->exit_notifier.notify = slirp_smb_exit; 698 qemu_add_exit_notifier(&s->exit_notifier); 699 return 0; 700 701 error: 702 qemu_del_net_client(nc); 703 return -1; 704 } 705 706 static SlirpState *slirp_lookup(Monitor *mon, const char *id) 707 { 708 if (id) { 709 NetClientState *nc = qemu_find_netdev(id); 710 if (!nc) { 711 monitor_printf(mon, "unrecognized netdev id '%s'\n", id); 712 return NULL; 713 } 714 if (strcmp(nc->model, "user")) { 715 monitor_printf(mon, "invalid device specified\n"); 716 return NULL; 717 } 718 return DO_UPCAST(SlirpState, nc, nc); 719 } else { 720 if (QTAILQ_EMPTY(&slirp_stacks)) { 721 monitor_printf(mon, "user mode network stack not in use\n"); 722 return NULL; 723 } 724 return QTAILQ_FIRST(&slirp_stacks); 725 } 726 } 727 728 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) 729 { 730 struct sockaddr_in host_addr = { 731 .sin_family = AF_INET, 732 .sin_addr = { 733 .s_addr = INADDR_ANY, 734 }, 735 }; 736 int host_port; 737 char buf[256]; 738 const char *src_str, *p; 739 SlirpState *s; 740 int is_udp = 0; 741 int err; 742 const char *arg1 = qdict_get_str(qdict, "arg1"); 743 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 744 745 if (arg2) { 746 s = slirp_lookup(mon, arg1); 747 src_str = arg2; 748 } else { 749 s = slirp_lookup(mon, NULL); 750 src_str = arg1; 751 } 752 if (!s) { 753 return; 754 } 755 756 p = src_str; 757 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 758 goto fail_syntax; 759 } 760 761 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 762 is_udp = 0; 763 } else if (!strcmp(buf, "udp")) { 764 is_udp = 1; 765 } else { 766 goto fail_syntax; 767 } 768 769 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 770 goto fail_syntax; 771 } 772 if (buf[0] != '\0' && !inet_aton(buf, &host_addr.sin_addr)) { 773 goto fail_syntax; 774 } 775 776 if (qemu_strtoi(p, NULL, 10, &host_port)) { 777 goto fail_syntax; 778 } 779 host_addr.sin_port = htons(host_port); 780 781 #if SLIRP_CHECK_VERSION(4, 5, 0) 782 err = slirp_remove_hostxfwd(s->slirp, (struct sockaddr *) &host_addr, 783 sizeof(host_addr), is_udp ? SLIRP_HOSTFWD_UDP : 0); 784 #else 785 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr.sin_addr, host_port); 786 #endif 787 788 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str, 789 err ? "not found" : "removed"); 790 return; 791 792 fail_syntax: 793 monitor_printf(mon, "invalid format\n"); 794 } 795 796 static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp) 797 { 798 struct sockaddr_in host_addr = { 799 .sin_family = AF_INET, 800 .sin_addr = { 801 .s_addr = INADDR_ANY, 802 }, 803 }; 804 struct sockaddr_in guest_addr = { 805 .sin_family = AF_INET, 806 .sin_addr = { 807 .s_addr = 0, 808 }, 809 }; 810 int err; 811 int host_port, guest_port; 812 const char *p; 813 char buf[256]; 814 int is_udp; 815 const char *end; 816 const char *fail_reason = "Unknown reason"; 817 818 p = redir_str; 819 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 820 fail_reason = "No : separators"; 821 goto fail_syntax; 822 } 823 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 824 is_udp = 0; 825 } else if (!strcmp(buf, "udp")) { 826 is_udp = 1; 827 } else { 828 fail_reason = "Bad protocol name"; 829 goto fail_syntax; 830 } 831 832 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 833 fail_reason = "Missing : separator"; 834 goto fail_syntax; 835 } 836 if (buf[0] != '\0' && !inet_aton(buf, &host_addr.sin_addr)) { 837 fail_reason = "Bad host address"; 838 goto fail_syntax; 839 } 840 841 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { 842 fail_reason = "Bad host port separator"; 843 goto fail_syntax; 844 } 845 err = qemu_strtoi(buf, &end, 0, &host_port); 846 if (err || host_port < 0 || host_port > 65535) { 847 fail_reason = "Bad host port"; 848 goto fail_syntax; 849 } 850 host_addr.sin_port = htons(host_port); 851 852 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 853 fail_reason = "Missing guest address"; 854 goto fail_syntax; 855 } 856 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr.sin_addr)) { 857 fail_reason = "Bad guest address"; 858 goto fail_syntax; 859 } 860 861 err = qemu_strtoi(p, &end, 0, &guest_port); 862 if (err || guest_port < 1 || guest_port > 65535) { 863 fail_reason = "Bad guest port"; 864 goto fail_syntax; 865 } 866 guest_addr.sin_port = htons(guest_port); 867 868 #if SLIRP_CHECK_VERSION(4, 5, 0) 869 err = slirp_add_hostxfwd(s->slirp, 870 (struct sockaddr *) &host_addr, sizeof(host_addr), 871 (struct sockaddr *) &guest_addr, sizeof(guest_addr), 872 is_udp ? SLIRP_HOSTFWD_UDP : 0); 873 #else 874 err = slirp_add_hostfwd(s->slirp, is_udp, 875 host_addr.sin_addr, host_port, 876 guest_addr.sin_addr, guest_port); 877 #endif 878 879 if (err < 0) { 880 error_setg(errp, "Could not set up host forwarding rule '%s'", 881 redir_str); 882 return -1; 883 } 884 return 0; 885 886 fail_syntax: 887 error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str, 888 fail_reason); 889 return -1; 890 } 891 892 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict) 893 { 894 const char *redir_str; 895 SlirpState *s; 896 const char *arg1 = qdict_get_str(qdict, "arg1"); 897 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 898 899 if (arg2) { 900 s = slirp_lookup(mon, arg1); 901 redir_str = arg2; 902 } else { 903 s = slirp_lookup(mon, NULL); 904 redir_str = arg1; 905 } 906 if (s) { 907 Error *err = NULL; 908 if (slirp_hostfwd(s, redir_str, &err) < 0) { 909 error_report_err(err); 910 } 911 } 912 913 } 914 915 #if defined(CONFIG_SMBD_COMMAND) 916 917 /* automatic user mode samba server configuration */ 918 static void slirp_smb_cleanup(SlirpState *s) 919 { 920 int ret; 921 922 if (s->smb_dir) { 923 gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir); 924 ret = system(cmd); 925 if (ret == -1 || !WIFEXITED(ret)) { 926 error_report("'%s' failed.", cmd); 927 } else if (WEXITSTATUS(ret)) { 928 error_report("'%s' failed. Error code: %d", 929 cmd, WEXITSTATUS(ret)); 930 } 931 g_free(cmd); 932 g_free(s->smb_dir); 933 s->smb_dir = NULL; 934 } 935 } 936 937 static int slirp_smb(SlirpState* s, const char *exported_dir, 938 struct in_addr vserver_addr, Error **errp) 939 { 940 char *smb_conf; 941 char *smb_cmdline; 942 struct passwd *passwd; 943 FILE *f; 944 945 passwd = getpwuid(geteuid()); 946 if (!passwd) { 947 error_setg(errp, "Failed to retrieve user name"); 948 return -1; 949 } 950 951 if (access(CONFIG_SMBD_COMMAND, F_OK)) { 952 error_setg(errp, "Could not find '%s', please install it", 953 CONFIG_SMBD_COMMAND); 954 return -1; 955 } 956 957 if (access(exported_dir, R_OK | X_OK)) { 958 error_setg(errp, "Error accessing shared directory '%s': %s", 959 exported_dir, strerror(errno)); 960 return -1; 961 } 962 963 s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL); 964 if (!s->smb_dir) { 965 error_setg(errp, "Could not create samba server dir"); 966 return -1; 967 } 968 smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf"); 969 970 f = fopen(smb_conf, "w"); 971 if (!f) { 972 slirp_smb_cleanup(s); 973 error_setg(errp, 974 "Could not create samba server configuration file '%s'", 975 smb_conf); 976 g_free(smb_conf); 977 return -1; 978 } 979 fprintf(f, 980 "[global]\n" 981 "private dir=%s\n" 982 "interfaces=127.0.0.1\n" 983 "bind interfaces only=yes\n" 984 "pid directory=%s\n" 985 "lock directory=%s\n" 986 "state directory=%s\n" 987 "cache directory=%s\n" 988 "ncalrpc dir=%s/ncalrpc\n" 989 "log file=%s/log.smbd\n" 990 "smb passwd file=%s/smbpasswd\n" 991 "security = user\n" 992 "map to guest = Bad User\n" 993 "load printers = no\n" 994 "printing = bsd\n" 995 "disable spoolss = yes\n" 996 "usershare max shares = 0\n" 997 "[qemu]\n" 998 "path=%s\n" 999 "read only=no\n" 1000 "guest ok=yes\n" 1001 "force user=%s\n", 1002 s->smb_dir, 1003 s->smb_dir, 1004 s->smb_dir, 1005 s->smb_dir, 1006 s->smb_dir, 1007 s->smb_dir, 1008 s->smb_dir, 1009 s->smb_dir, 1010 exported_dir, 1011 passwd->pw_name 1012 ); 1013 fclose(f); 1014 1015 smb_cmdline = g_strdup_printf("%s -l %s -s %s", 1016 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf); 1017 g_free(smb_conf); 1018 1019 if (slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 139) < 0 || 1020 slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 445) < 0) { 1021 slirp_smb_cleanup(s); 1022 g_free(smb_cmdline); 1023 error_setg(errp, "Conflicting/invalid smbserver address"); 1024 return -1; 1025 } 1026 g_free(smb_cmdline); 1027 return 0; 1028 } 1029 1030 #endif /* defined(CONFIG_SMBD_COMMAND) */ 1031 1032 static int guestfwd_can_read(void *opaque) 1033 { 1034 struct GuestFwd *fwd = opaque; 1035 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port); 1036 } 1037 1038 static void guestfwd_read(void *opaque, const uint8_t *buf, int size) 1039 { 1040 struct GuestFwd *fwd = opaque; 1041 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size); 1042 } 1043 1044 static ssize_t guestfwd_write(const void *buf, size_t len, void *chr) 1045 { 1046 return qemu_chr_fe_write_all(chr, buf, len); 1047 } 1048 1049 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp) 1050 { 1051 /* TODO: IPv6 */ 1052 struct in_addr server = { .s_addr = 0 }; 1053 struct GuestFwd *fwd; 1054 const char *p; 1055 char buf[128]; 1056 char *end; 1057 int port; 1058 1059 p = config_str; 1060 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 1061 goto fail_syntax; 1062 } 1063 if (strcmp(buf, "tcp") && buf[0] != '\0') { 1064 goto fail_syntax; 1065 } 1066 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 1067 goto fail_syntax; 1068 } 1069 if (buf[0] != '\0' && !inet_aton(buf, &server)) { 1070 goto fail_syntax; 1071 } 1072 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { 1073 goto fail_syntax; 1074 } 1075 port = strtol(buf, &end, 10); 1076 if (*end != '\0' || port < 1 || port > 65535) { 1077 goto fail_syntax; 1078 } 1079 1080 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port); 1081 1082 if (g_str_has_prefix(p, "cmd:")) { 1083 if (slirp_add_exec(s->slirp, &p[4], &server, port) < 0) { 1084 error_setg(errp, "Conflicting/invalid host:port in guest " 1085 "forwarding rule '%s'", config_str); 1086 return -1; 1087 } 1088 } else { 1089 Error *err = NULL; 1090 /* 1091 * FIXME: sure we want to support implicit 1092 * muxed monitors here? 1093 */ 1094 Chardev *chr = qemu_chr_new_mux_mon(buf, p, NULL); 1095 1096 if (!chr) { 1097 error_setg(errp, "Could not open guest forwarding device '%s'", 1098 buf); 1099 return -1; 1100 } 1101 1102 fwd = g_new(struct GuestFwd, 1); 1103 qemu_chr_fe_init(&fwd->hd, chr, &err); 1104 if (err) { 1105 error_propagate(errp, err); 1106 object_unparent(OBJECT(chr)); 1107 g_free(fwd); 1108 return -1; 1109 } 1110 1111 if (slirp_add_guestfwd(s->slirp, guestfwd_write, &fwd->hd, 1112 &server, port) < 0) { 1113 error_setg(errp, "Conflicting/invalid host:port in guest " 1114 "forwarding rule '%s'", config_str); 1115 qemu_chr_fe_deinit(&fwd->hd, true); 1116 g_free(fwd); 1117 return -1; 1118 } 1119 fwd->server = server; 1120 fwd->port = port; 1121 fwd->slirp = s->slirp; 1122 1123 qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read, 1124 NULL, NULL, fwd, NULL, true); 1125 s->fwd = g_slist_append(s->fwd, fwd); 1126 } 1127 return 0; 1128 1129 fail_syntax: 1130 error_setg(errp, "Invalid guest forwarding rule '%s'", config_str); 1131 return -1; 1132 } 1133 1134 void hmp_info_usernet(Monitor *mon, const QDict *qdict) 1135 { 1136 SlirpState *s; 1137 1138 QTAILQ_FOREACH(s, &slirp_stacks, entry) { 1139 int id; 1140 bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0; 1141 char *info = slirp_connection_info(s->slirp); 1142 monitor_printf(mon, "Hub %d (%s):\n%s", 1143 got_hub_id ? id : -1, 1144 s->nc.name, info); 1145 g_free(info); 1146 } 1147 } 1148 1149 static void 1150 net_init_slirp_configs(const StringList *fwd, int flags) 1151 { 1152 while (fwd) { 1153 struct slirp_config_str *config; 1154 1155 config = g_malloc0(sizeof(*config)); 1156 pstrcpy(config->str, sizeof(config->str), fwd->value->str); 1157 config->flags = flags; 1158 config->next = slirp_configs; 1159 slirp_configs = config; 1160 1161 fwd = fwd->next; 1162 } 1163 } 1164 1165 static const char **slirp_dnssearch(const StringList *dnsname) 1166 { 1167 const StringList *c = dnsname; 1168 size_t i = 0, num_opts = 0; 1169 const char **ret; 1170 1171 while (c) { 1172 num_opts++; 1173 c = c->next; 1174 } 1175 1176 if (num_opts == 0) { 1177 return NULL; 1178 } 1179 1180 ret = g_malloc((num_opts + 1) * sizeof(*ret)); 1181 c = dnsname; 1182 while (c) { 1183 ret[i++] = c->value->str; 1184 c = c->next; 1185 } 1186 ret[i] = NULL; 1187 return ret; 1188 } 1189 1190 int net_init_slirp(const Netdev *netdev, const char *name, 1191 NetClientState *peer, Error **errp) 1192 { 1193 struct slirp_config_str *config; 1194 char *vnet; 1195 int ret; 1196 const NetdevUserOptions *user; 1197 const char **dnssearch; 1198 bool ipv4 = true, ipv6 = true; 1199 1200 assert(netdev->type == NET_CLIENT_DRIVER_USER); 1201 user = &netdev->u.user; 1202 1203 if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) || 1204 (user->has_ipv4 && !user->ipv4)) { 1205 ipv4 = 0; 1206 } 1207 if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) || 1208 (user->has_ipv6 && !user->ipv6)) { 1209 ipv6 = 0; 1210 } 1211 1212 vnet = user->net ? g_strdup(user->net) : 1213 user->ip ? g_strdup_printf("%s/24", user->ip) : 1214 NULL; 1215 1216 dnssearch = slirp_dnssearch(user->dnssearch); 1217 1218 /* all optional fields are initialized to "all bits zero" */ 1219 1220 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD); 1221 net_init_slirp_configs(user->guestfwd, 0); 1222 1223 ret = net_slirp_init(peer, "user", name, user->q_restrict, 1224 ipv4, vnet, user->host, 1225 ipv6, user->ipv6_prefix, user->ipv6_prefixlen, 1226 user->ipv6_host, user->hostname, user->tftp, 1227 user->bootfile, user->dhcpstart, 1228 user->dns, user->ipv6_dns, user->smb, 1229 user->smbserver, dnssearch, user->domainname, 1230 user->tftp_server_name, errp); 1231 1232 while (slirp_configs) { 1233 config = slirp_configs; 1234 slirp_configs = config->next; 1235 g_free(config); 1236 } 1237 1238 g_free(vnet); 1239 g_free(dnssearch); 1240 1241 return ret; 1242 } 1243