David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1 | /* |
| 2 | * libslirp glue |
| 3 | * |
| 4 | * Copyright (c) 2004-2008 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 | #include "qemu-common.h" |
| 25 | #include "qemu-char.h" |
| 26 | #include "slirp.h" |
| 27 | #include "proxy_common.h" |
| 28 | #include "hw/hw.h" |
| 29 | |
| 30 | #include "android/utils/debug.h" /* for dprint */ |
| 31 | #include "android/utils/bufprint.h" |
| 32 | #include "android/android.h" |
| 33 | #include "sockets.h" |
| 34 | |
David 'Digit' Turner | ebdcd6f | 2011-02-17 05:05:01 +0100 | [diff] [blame] | 35 | #include "qemu-queue.h" |
rich cannings | 7339b55 | 2011-02-16 13:43:44 -0800 | [diff] [blame] | 36 | |
| 37 | /* proto types */ |
| 38 | static void slirp_net_forward_init(void); |
| 39 | |
| 40 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 41 | #define D(...) VERBOSE_PRINT(slirp,__VA_ARGS__) |
| 42 | #define DN(...) do { if (VERBOSE_CHECK(slirp)) dprintn(__VA_ARGS__); } while (0) |
| 43 | |
| 44 | /* host address */ |
| 45 | uint32_t our_addr_ip; |
| 46 | /* host dns address */ |
| 47 | uint32_t dns_addr[DNS_ADDR_MAX]; |
| 48 | int dns_addr_count; |
| 49 | |
| 50 | /* host loopback address */ |
| 51 | uint32_t loopback_addr_ip; |
| 52 | |
| 53 | /* address for slirp virtual addresses */ |
| 54 | uint32_t special_addr_ip; |
| 55 | |
| 56 | /* virtual address alias for host */ |
| 57 | uint32_t alias_addr_ip; |
| 58 | |
| 59 | static const uint8_t special_ethaddr[6] = { |
| 60 | 0x52, 0x54, 0x00, 0x12, 0x35, 0x00 |
| 61 | }; |
| 62 | |
| 63 | /* ARP cache for the guest IP addresses (XXX: allow many entries) */ |
| 64 | uint8_t client_ethaddr[6]; |
| 65 | static ipaddr_t client_ip; |
| 66 | |
| 67 | static const uint8_t zero_ethaddr[6] = { 0, 0, 0, 0, 0, 0 }; |
| 68 | |
| 69 | const char *slirp_special_ip = CTL_SPECIAL; |
| 70 | int slirp_restrict; |
| 71 | static int do_slowtimo; |
| 72 | int link_up; |
| 73 | struct timeval tt; |
| 74 | FILE *lfd; |
| 75 | struct ex_list *exec_list; |
| 76 | |
| 77 | /* XXX: suppress those select globals */ |
| 78 | fd_set *global_readfds, *global_writefds, *global_xfds; |
| 79 | |
| 80 | char slirp_hostname[33]; |
| 81 | |
| 82 | int slirp_add_dns_server(const SockAddress* new_dns_addr) |
| 83 | { |
| 84 | int dns_ip; |
| 85 | |
| 86 | if (dns_addr_count >= DNS_ADDR_MAX) |
| 87 | return -1; |
| 88 | |
| 89 | dns_ip = sock_address_get_ip(new_dns_addr); |
rich cannings | f06d4c7 | 2011-02-09 13:24:37 -0800 | [diff] [blame] | 90 | if (dns_ip == -1) |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 91 | return -1; |
| 92 | |
| 93 | dns_addr[dns_addr_count++] = dns_ip; |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | |
| 98 | #ifdef _WIN32 |
| 99 | |
| 100 | int slirp_get_system_dns_servers(void) |
| 101 | { |
| 102 | FIXED_INFO *FixedInfo=NULL; |
| 103 | ULONG BufLen; |
| 104 | DWORD ret; |
| 105 | IP_ADDR_STRING *pIPAddr; |
| 106 | |
| 107 | if (dns_addr_count > 0) |
| 108 | return dns_addr_count; |
| 109 | |
| 110 | FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO)); |
| 111 | BufLen = sizeof(FIXED_INFO); |
| 112 | |
| 113 | if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) { |
| 114 | if (FixedInfo) { |
| 115 | GlobalFree(FixedInfo); |
| 116 | FixedInfo = NULL; |
| 117 | } |
| 118 | FixedInfo = GlobalAlloc(GPTR, BufLen); |
| 119 | } |
| 120 | |
| 121 | if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) { |
| 122 | printf("GetNetworkParams failed. ret = %08x\n", (u_int)ret ); |
| 123 | if (FixedInfo) { |
| 124 | GlobalFree(FixedInfo); |
| 125 | FixedInfo = NULL; |
| 126 | } |
| 127 | return -1; |
| 128 | } |
| 129 | |
| 130 | D( "DNS Servers:"); |
| 131 | pIPAddr = &(FixedInfo->DnsServerList); |
| 132 | while (pIPAddr && dns_addr_count < DNS_ADDR_MAX) { |
| 133 | uint32_t ip; |
| 134 | D( " %s", pIPAddr->IpAddress.String ); |
| 135 | if (inet_strtoip(pIPAddr->IpAddress.String, &ip) == 0) { |
| 136 | if (ip == loopback_addr_ip) |
| 137 | ip = our_addr_ip; |
| 138 | if (dns_addr_count < DNS_ADDR_MAX) |
| 139 | dns_addr[dns_addr_count++] = ip; |
| 140 | } |
| 141 | pIPAddr = pIPAddr->Next; |
| 142 | } |
| 143 | |
| 144 | if (FixedInfo) { |
| 145 | GlobalFree(FixedInfo); |
| 146 | FixedInfo = NULL; |
| 147 | } |
| 148 | if (dns_addr_count <= 0) |
| 149 | return -1; |
| 150 | |
| 151 | return dns_addr_count; |
| 152 | } |
| 153 | |
| 154 | #else |
| 155 | |
| 156 | int slirp_get_system_dns_servers(void) |
| 157 | { |
| 158 | char buff[512]; |
| 159 | char buff2[257]; |
| 160 | FILE *f; |
| 161 | |
| 162 | if (dns_addr_count > 0) |
| 163 | return dns_addr_count; |
| 164 | |
| 165 | #ifdef CONFIG_DARWIN |
| 166 | /* on Darwin /etc/resolv.conf is a symlink to /private/var/run/resolv.conf |
| 167 | * in some siutations, the symlink can be destroyed and the system will not |
| 168 | * re-create it. Darwin-aware applications will continue to run, but "legacy" |
| 169 | * Unix ones will not. |
| 170 | */ |
| 171 | f = fopen("/private/var/run/resolv.conf", "r"); |
| 172 | if (!f) |
| 173 | f = fopen("/etc/resolv.conf", "r"); /* desperate attempt to sanity */ |
| 174 | #else |
| 175 | f = fopen("/etc/resolv.conf", "r"); |
| 176 | #endif |
| 177 | if (!f) |
| 178 | return -1; |
| 179 | |
| 180 | DN("emulator: IP address of your DNS(s): "); |
| 181 | while (fgets(buff, 512, f) != NULL) { |
| 182 | if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) { |
| 183 | uint32_t tmp_ip; |
| 184 | |
| 185 | if (inet_strtoip(buff2, &tmp_ip) < 0) |
| 186 | continue; |
| 187 | if (tmp_ip == loopback_addr_ip) |
| 188 | tmp_ip = our_addr_ip; |
| 189 | if (dns_addr_count < DNS_ADDR_MAX) { |
| 190 | dns_addr[dns_addr_count++] = tmp_ip; |
| 191 | if (dns_addr_count > 1) |
| 192 | DN(", "); |
| 193 | DN("%s", inet_iptostr(tmp_ip)); |
| 194 | } else { |
| 195 | DN("(more)"); |
| 196 | break; |
| 197 | } |
| 198 | } |
| 199 | } |
| 200 | DN("\n"); |
| 201 | fclose(f); |
| 202 | |
| 203 | if (!dns_addr_count) |
| 204 | return -1; |
| 205 | |
| 206 | return dns_addr_count; |
| 207 | } |
| 208 | |
| 209 | #endif |
| 210 | |
| 211 | static void slirp_state_save(QEMUFile *f, void *opaque); |
| 212 | static int slirp_state_load(QEMUFile *f, void *opaque, int version_id); |
| 213 | |
| 214 | void slirp_init(int restricted, const char *special_ip) |
| 215 | { |
| 216 | #if DEBUG |
| 217 | int slirp_logmask = 0; |
| 218 | char slirp_logfile[512]; |
| 219 | { |
| 220 | const char* env = getenv( "ANDROID_SLIRP_LOGMASK" ); |
| 221 | if (env != NULL) |
| 222 | slirp_logmask = atoi(env); |
| 223 | else if (VERBOSE_CHECK(slirp)) |
| 224 | slirp_logmask = DEBUG_DEFAULT; |
| 225 | } |
| 226 | |
| 227 | { |
| 228 | char* p = slirp_logfile; |
| 229 | char* end = p + sizeof(slirp_logfile); |
| 230 | |
| 231 | p = bufprint_temp_file( p, end, "slirp.log" ); |
| 232 | if (p >= end) { |
| 233 | dprint( "cannot create slirp log file in temporary directory" ); |
| 234 | slirp_logmask = 0; |
| 235 | } |
| 236 | } |
| 237 | if (slirp_logmask) { |
| 238 | dprint( "sending slirp logs with mask %x to %s", slirp_logmask, slirp_logfile ); |
| 239 | debug_init( slirp_logfile, slirp_logmask ); |
| 240 | } |
| 241 | #endif |
| 242 | |
| 243 | link_up = 1; |
| 244 | slirp_restrict = restricted; |
| 245 | |
| 246 | if_init(); |
| 247 | ip_init(); |
| 248 | |
| 249 | /* Initialise mbufs *after* setting the MTU */ |
| 250 | m_init(); |
| 251 | |
| 252 | /* set default addresses */ |
| 253 | inet_strtoip("127.0.0.1", &loopback_addr_ip); |
| 254 | |
| 255 | if (dns_addr_count == 0) { |
| 256 | if (slirp_get_system_dns_servers() < 0) { |
| 257 | dns_addr[0] = loopback_addr_ip; |
| 258 | dns_addr_count = 1; |
| 259 | fprintf (stderr, "Warning: No DNS servers found\n"); |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | inet_strtoip(CTL_SPECIAL, &special_addr_ip); |
| 264 | |
| 265 | alias_addr_ip = special_addr_ip | CTL_ALIAS; |
| 266 | getouraddr(); |
| 267 | register_savevm("slirp", 0, 1, slirp_state_save, slirp_state_load, NULL); |
rich cannings | 7339b55 | 2011-02-16 13:43:44 -0800 | [diff] [blame] | 268 | |
| 269 | slirp_net_forward_init(); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 270 | } |
| 271 | |
| 272 | #define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED) |
| 273 | #define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED) |
| 274 | #define UPD_NFDS(x) if (nfds < (x)) nfds = (x) |
| 275 | |
| 276 | /* |
| 277 | * curtime kept to an accuracy of 1ms |
| 278 | */ |
| 279 | #ifdef _WIN32 |
| 280 | static void updtime(void) |
| 281 | { |
| 282 | struct _timeb tb; |
| 283 | |
| 284 | _ftime(&tb); |
| 285 | curtime = (u_int)tb.time * (u_int)1000; |
| 286 | curtime += (u_int)tb.millitm; |
| 287 | } |
| 288 | #else |
| 289 | static void updtime(void) |
| 290 | { |
| 291 | gettimeofday(&tt, NULL); |
| 292 | |
| 293 | curtime = (u_int)tt.tv_sec * (u_int)1000; |
| 294 | curtime += (u_int)tt.tv_usec / (u_int)1000; |
| 295 | |
| 296 | if ((tt.tv_usec % 1000) >= 500) |
| 297 | curtime++; |
| 298 | } |
| 299 | #endif |
| 300 | |
| 301 | void slirp_select_fill(int *pnfds, |
| 302 | fd_set *readfds, fd_set *writefds, fd_set *xfds) |
| 303 | { |
| 304 | struct socket *so, *so_next; |
| 305 | struct timeval timeout; |
| 306 | int nfds; |
| 307 | int tmp_time; |
| 308 | |
| 309 | /* fail safe */ |
| 310 | global_readfds = NULL; |
| 311 | global_writefds = NULL; |
| 312 | global_xfds = NULL; |
| 313 | |
| 314 | nfds = *pnfds; |
| 315 | /* |
| 316 | * First, TCP sockets |
| 317 | */ |
| 318 | do_slowtimo = 0; |
| 319 | if (link_up) { |
| 320 | /* |
| 321 | * *_slowtimo needs calling if there are IP fragments |
| 322 | * in the fragment queue, or there are TCP connections active |
| 323 | */ |
| 324 | do_slowtimo = ((tcb.so_next != &tcb) || |
| 325 | (&ipq.ip_link != ipq.ip_link.next)); |
| 326 | |
| 327 | for (so = tcb.so_next; so != &tcb; so = so_next) { |
| 328 | so_next = so->so_next; |
| 329 | |
| 330 | /* |
| 331 | * See if we need a tcp_fasttimo |
| 332 | */ |
| 333 | if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK) |
| 334 | time_fasttimo = curtime; /* Flag when we want a fasttimo */ |
| 335 | |
| 336 | /* |
| 337 | * NOFDREF can include still connecting to local-host, |
| 338 | * newly socreated() sockets etc. Don't want to select these. |
| 339 | */ |
| 340 | if (so->so_state & SS_NOFDREF || so->s == -1) |
| 341 | continue; |
| 342 | |
| 343 | /* |
| 344 | * don't register proxified socked connections here |
| 345 | */ |
| 346 | if ((so->so_state & SS_PROXIFIED) != 0) |
| 347 | continue; |
| 348 | |
| 349 | /* |
| 350 | * Set for reading sockets which are accepting |
| 351 | */ |
| 352 | if (so->so_state & SS_FACCEPTCONN) { |
| 353 | FD_SET(so->s, readfds); |
| 354 | UPD_NFDS(so->s); |
| 355 | continue; |
| 356 | } |
| 357 | |
| 358 | /* |
| 359 | * Set for writing sockets which are connecting |
| 360 | */ |
| 361 | if (so->so_state & SS_ISFCONNECTING) { |
| 362 | FD_SET(so->s, writefds); |
| 363 | UPD_NFDS(so->s); |
| 364 | continue; |
| 365 | } |
| 366 | |
| 367 | /* |
| 368 | * Set for writing if we are connected, can send more, and |
| 369 | * we have something to send |
| 370 | */ |
| 371 | if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) { |
| 372 | FD_SET(so->s, writefds); |
| 373 | UPD_NFDS(so->s); |
| 374 | } |
| 375 | |
| 376 | /* |
| 377 | * Set for reading (and urgent data) if we are connected, can |
| 378 | * receive more, and we have room for it XXX /2 ? |
| 379 | */ |
| 380 | if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) { |
| 381 | FD_SET(so->s, readfds); |
| 382 | FD_SET(so->s, xfds); |
| 383 | UPD_NFDS(so->s); |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | /* |
| 388 | * UDP sockets |
| 389 | */ |
| 390 | for (so = udb.so_next; so != &udb; so = so_next) { |
| 391 | so_next = so->so_next; |
| 392 | |
| 393 | if ((so->so_state & SS_PROXIFIED) != 0) |
| 394 | continue; |
| 395 | |
| 396 | /* |
| 397 | * See if it's timed out |
| 398 | */ |
| 399 | if (so->so_expire) { |
| 400 | if (so->so_expire <= curtime) { |
| 401 | udp_detach(so); |
| 402 | continue; |
| 403 | } else |
| 404 | do_slowtimo = 1; /* Let socket expire */ |
| 405 | } |
| 406 | |
| 407 | /* |
| 408 | * When UDP packets are received from over the |
| 409 | * link, they're sendto()'d straight away, so |
| 410 | * no need for setting for writing |
| 411 | * Limit the number of packets queued by this session |
| 412 | * to 4. Note that even though we try and limit this |
| 413 | * to 4 packets, the session could have more queued |
| 414 | * if the packets needed to be fragmented |
| 415 | * (XXX <= 4 ?) |
| 416 | */ |
| 417 | if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) { |
| 418 | FD_SET(so->s, readfds); |
| 419 | UPD_NFDS(so->s); |
| 420 | } |
| 421 | } |
| 422 | } |
| 423 | |
| 424 | /* |
| 425 | * Setup timeout to use minimum CPU usage, especially when idle |
| 426 | */ |
| 427 | |
| 428 | /* |
| 429 | * First, see the timeout needed by *timo |
| 430 | */ |
| 431 | timeout.tv_sec = 0; |
| 432 | timeout.tv_usec = -1; |
| 433 | /* |
| 434 | * If a slowtimo is needed, set timeout to 500ms from the last |
| 435 | * slow timeout. If a fast timeout is needed, set timeout within |
| 436 | * 200ms of when it was requested. |
| 437 | */ |
| 438 | if (do_slowtimo) { |
| 439 | /* XXX + 10000 because some select()'s aren't that accurate */ |
| 440 | timeout.tv_usec = ((500 - (curtime - last_slowtimo)) * 1000) + 10000; |
| 441 | if (timeout.tv_usec < 0) |
| 442 | timeout.tv_usec = 0; |
| 443 | else if (timeout.tv_usec > 510000) |
| 444 | timeout.tv_usec = 510000; |
| 445 | |
| 446 | /* Can only fasttimo if we also slowtimo */ |
| 447 | if (time_fasttimo) { |
| 448 | tmp_time = (200 - (curtime - time_fasttimo)) * 1000; |
| 449 | if (tmp_time < 0) |
| 450 | tmp_time = 0; |
| 451 | |
| 452 | /* Choose the smallest of the 2 */ |
| 453 | if (tmp_time < timeout.tv_usec) |
| 454 | timeout.tv_usec = (u_int)tmp_time; |
| 455 | } |
| 456 | } |
| 457 | /* |
| 458 | * now, the proxified sockets |
| 459 | */ |
| 460 | proxy_manager_select_fill(&nfds, readfds, writefds, xfds); |
| 461 | |
| 462 | *pnfds = nfds; |
| 463 | } |
| 464 | |
| 465 | void slirp_select_poll(fd_set *readfds, fd_set *writefds, fd_set *xfds) |
| 466 | { |
| 467 | struct socket *so, *so_next; |
| 468 | int ret; |
| 469 | |
| 470 | global_readfds = readfds; |
| 471 | global_writefds = writefds; |
| 472 | global_xfds = xfds; |
| 473 | |
| 474 | /* Update time */ |
| 475 | updtime(); |
| 476 | |
| 477 | /* |
| 478 | * See if anything has timed out |
| 479 | */ |
| 480 | if (link_up) { |
| 481 | if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) { |
| 482 | tcp_fasttimo(); |
| 483 | time_fasttimo = 0; |
| 484 | } |
| 485 | if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) { |
| 486 | ip_slowtimo(); |
| 487 | tcp_slowtimo(); |
| 488 | last_slowtimo = curtime; |
| 489 | } |
| 490 | } |
| 491 | |
| 492 | /* |
| 493 | * Check sockets |
| 494 | */ |
| 495 | if (link_up) { |
| 496 | /* |
| 497 | * Check TCP sockets |
| 498 | */ |
| 499 | for (so = tcb.so_next; so != &tcb; so = so_next) { |
| 500 | so_next = so->so_next; |
| 501 | |
| 502 | /* |
| 503 | * FD_ISSET is meaningless on these sockets |
| 504 | * (and they can crash the program) |
| 505 | */ |
| 506 | if (so->so_state & SS_NOFDREF || so->s == -1) |
| 507 | continue; |
| 508 | |
| 509 | /* |
| 510 | * proxified sockets are polled later in this |
| 511 | * function. |
| 512 | */ |
| 513 | if ((so->so_state & SS_PROXIFIED) != 0) |
| 514 | continue; |
| 515 | |
| 516 | /* |
| 517 | * Check for URG data |
| 518 | * This will soread as well, so no need to |
| 519 | * test for readfds below if this succeeds |
| 520 | */ |
| 521 | if (FD_ISSET(so->s, xfds)) |
| 522 | sorecvoob(so); |
| 523 | /* |
| 524 | * Check sockets for reading |
| 525 | */ |
| 526 | else if (FD_ISSET(so->s, readfds)) { |
| 527 | /* |
| 528 | * Check for incoming connections |
| 529 | */ |
| 530 | if (so->so_state & SS_FACCEPTCONN) { |
| 531 | tcp_connect(so); |
| 532 | continue; |
| 533 | } /* else */ |
| 534 | ret = soread(so); |
| 535 | |
| 536 | /* Output it if we read something */ |
| 537 | if (ret > 0) |
| 538 | tcp_output(sototcpcb(so)); |
| 539 | } |
| 540 | |
| 541 | /* |
| 542 | * Check sockets for writing |
| 543 | */ |
| 544 | if (FD_ISSET(so->s, writefds)) { |
| 545 | /* |
| 546 | * Check for non-blocking, still-connecting sockets |
| 547 | */ |
| 548 | if (so->so_state & SS_ISFCONNECTING) { |
| 549 | /* Connected */ |
| 550 | so->so_state &= ~SS_ISFCONNECTING; |
| 551 | |
| 552 | ret = socket_send(so->s, (const void *)&ret, 0); |
| 553 | if (ret < 0) { |
| 554 | /* XXXXX Must fix, zero bytes is a NOP */ |
| 555 | if (errno == EAGAIN || errno == EWOULDBLOCK || |
| 556 | errno == EINPROGRESS || errno == ENOTCONN) |
| 557 | continue; |
| 558 | |
| 559 | /* else failed */ |
| 560 | so->so_state = SS_NOFDREF; |
| 561 | } |
| 562 | /* else so->so_state &= ~SS_ISFCONNECTING; */ |
| 563 | |
| 564 | /* |
| 565 | * Continue tcp_input |
| 566 | */ |
| 567 | tcp_input((struct mbuf *)NULL, sizeof(struct ip), so); |
| 568 | /* continue; */ |
| 569 | } else |
| 570 | ret = sowrite(so); |
| 571 | /* |
| 572 | * XXXXX If we wrote something (a lot), there |
| 573 | * could be a need for a window update. |
| 574 | * In the worst case, the remote will send |
| 575 | * a window probe to get things going again |
| 576 | */ |
| 577 | } |
| 578 | |
| 579 | /* |
| 580 | * Probe a still-connecting, non-blocking socket |
| 581 | * to check if it's still alive |
| 582 | */ |
| 583 | #ifdef PROBE_CONN |
| 584 | if (so->so_state & SS_ISFCONNECTING) { |
| 585 | ret = socket_recv(so->s, (char *)&ret, 0); |
| 586 | |
| 587 | if (ret < 0) { |
| 588 | /* XXX */ |
| 589 | if (errno == EAGAIN || errno == EWOULDBLOCK || |
| 590 | errno == EINPROGRESS || errno == ENOTCONN) |
| 591 | continue; /* Still connecting, continue */ |
| 592 | |
| 593 | /* else failed */ |
| 594 | so->so_state = SS_NOFDREF; |
| 595 | |
| 596 | /* tcp_input will take care of it */ |
| 597 | } else { |
| 598 | ret = socket_send(so->s, &ret, 0); |
| 599 | if (ret < 0) { |
| 600 | /* XXX */ |
| 601 | if (errno == EAGAIN || errno == EWOULDBLOCK || |
| 602 | errno == EINPROGRESS || errno == ENOTCONN) |
| 603 | continue; |
| 604 | /* else failed */ |
| 605 | so->so_state = SS_NOFDREF; |
| 606 | } else |
| 607 | so->so_state &= ~SS_ISFCONNECTING; |
| 608 | |
| 609 | } |
| 610 | tcp_input((struct mbuf *)NULL, sizeof(struct ip),so); |
| 611 | } /* SS_ISFCONNECTING */ |
| 612 | #endif |
| 613 | } |
| 614 | |
| 615 | /* |
| 616 | * Now UDP sockets. |
| 617 | * Incoming packets are sent straight away, they're not buffered. |
| 618 | * Incoming UDP data isn't buffered either. |
| 619 | */ |
| 620 | for (so = udb.so_next; so != &udb; so = so_next) { |
| 621 | so_next = so->so_next; |
| 622 | |
| 623 | if ((so->so_state & SS_PROXIFIED) != 0) |
| 624 | continue; |
| 625 | |
| 626 | if (so->s != -1 && FD_ISSET(so->s, readfds)) { |
| 627 | sorecvfrom(so); |
| 628 | } |
| 629 | } |
| 630 | } |
| 631 | |
| 632 | /* |
| 633 | * Now the proxified sockets |
| 634 | */ |
| 635 | proxy_manager_poll(readfds, writefds, xfds); |
| 636 | |
| 637 | /* |
| 638 | * See if we can start outputting |
| 639 | */ |
| 640 | if (if_queued && link_up) |
| 641 | if_start(); |
| 642 | |
| 643 | /* clear global file descriptor sets. |
| 644 | * these reside on the stack in vl.c |
| 645 | * so they're unusable if we're not in |
| 646 | * slirp_select_fill or slirp_select_poll. |
| 647 | */ |
| 648 | global_readfds = NULL; |
| 649 | global_writefds = NULL; |
| 650 | global_xfds = NULL; |
| 651 | } |
| 652 | |
| 653 | #define ETH_ALEN 6 |
| 654 | #define ETH_HLEN 14 |
| 655 | |
| 656 | #define ETH_P_IP 0x0800 /* Internet Protocol packet */ |
| 657 | #define ETH_P_ARP 0x0806 /* Address Resolution packet */ |
| 658 | |
| 659 | #define ARPOP_REQUEST 1 /* ARP request */ |
| 660 | #define ARPOP_REPLY 2 /* ARP reply */ |
| 661 | |
| 662 | struct ethhdr |
| 663 | { |
| 664 | unsigned char h_dest[ETH_ALEN]; /* destination eth addr */ |
| 665 | unsigned char h_source[ETH_ALEN]; /* source ether addr */ |
| 666 | unsigned short h_proto; /* packet type ID field */ |
| 667 | }; |
| 668 | |
| 669 | struct arphdr |
| 670 | { |
| 671 | unsigned short ar_hrd; /* format of hardware address */ |
| 672 | unsigned short ar_pro; /* format of protocol address */ |
| 673 | unsigned char ar_hln; /* length of hardware address */ |
| 674 | unsigned char ar_pln; /* length of protocol address */ |
| 675 | unsigned short ar_op; /* ARP opcode (command) */ |
| 676 | |
| 677 | /* |
| 678 | * Ethernet looks like this : This bit is variable sized however... |
| 679 | */ |
| 680 | unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */ |
| 681 | unsigned char ar_sip[4]; /* sender IP address */ |
| 682 | unsigned char ar_tha[ETH_ALEN]; /* target hardware address */ |
| 683 | unsigned char ar_tip[4]; /* target IP address */ |
| 684 | }; |
| 685 | |
| 686 | static void arp_input(const uint8_t *pkt, int pkt_len) |
| 687 | { |
| 688 | struct ethhdr *eh = (struct ethhdr *)pkt; |
| 689 | struct arphdr *ah = (struct arphdr *)(pkt + ETH_HLEN); |
| 690 | uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)]; |
| 691 | struct ethhdr *reh = (struct ethhdr *)arp_reply; |
| 692 | struct arphdr *rah = (struct arphdr *)(arp_reply + ETH_HLEN); |
| 693 | int ar_op; |
| 694 | struct ex_list *ex_ptr; |
| 695 | |
| 696 | ar_op = ntohs(ah->ar_op); |
| 697 | switch(ar_op) { |
| 698 | uint32_t ar_tip_ip; |
| 699 | |
| 700 | case ARPOP_REQUEST: |
| 701 | ar_tip_ip = ip_read32h(ah->ar_tip); |
| 702 | if ((ar_tip_ip & 0xffffff00) == special_addr_ip) { |
| 703 | uint32_t ar_tip_low = ar_tip_ip & 0xff; |
| 704 | if ( CTL_IS_DNS(ar_tip_low) || ar_tip_low == CTL_ALIAS) |
| 705 | goto arp_ok; |
| 706 | for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) { |
| 707 | if (ex_ptr->ex_addr == ar_tip_low) |
| 708 | goto arp_ok; |
| 709 | } |
| 710 | return; |
| 711 | arp_ok: |
| 712 | /* XXX: make an ARP request to have the client address */ |
| 713 | memcpy(client_ethaddr, eh->h_source, ETH_ALEN); |
| 714 | |
| 715 | /* ARP request for alias/dns mac address */ |
| 716 | memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN); |
| 717 | memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1); |
| 718 | reh->h_source[5] = ar_tip_low; |
| 719 | reh->h_proto = htons(ETH_P_ARP); |
| 720 | |
| 721 | rah->ar_hrd = htons(1); |
| 722 | rah->ar_pro = htons(ETH_P_IP); |
| 723 | rah->ar_hln = ETH_ALEN; |
| 724 | rah->ar_pln = 4; |
| 725 | rah->ar_op = htons(ARPOP_REPLY); |
| 726 | memcpy(rah->ar_sha, reh->h_source, ETH_ALEN); |
| 727 | memcpy(rah->ar_sip, ah->ar_tip, 4); |
| 728 | memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN); |
| 729 | memcpy(rah->ar_tip, ah->ar_sip, 4); |
| 730 | slirp_output(arp_reply, sizeof(arp_reply)); |
| 731 | } |
| 732 | break; |
| 733 | case ARPOP_REPLY: |
| 734 | /* reply to request of client mac address ? */ |
| 735 | if (!memcmp(client_ethaddr, zero_ethaddr, ETH_ALEN) && |
| 736 | ip_equal( ip_read(ah->ar_sip), client_ip )) { |
| 737 | memcpy(client_ethaddr, ah->ar_sha, ETH_ALEN); |
| 738 | } |
| 739 | break; |
| 740 | default: |
| 741 | break; |
| 742 | } |
| 743 | } |
| 744 | |
| 745 | void slirp_input(const uint8_t *pkt, int pkt_len) |
| 746 | { |
| 747 | struct mbuf *m; |
| 748 | int proto; |
| 749 | |
| 750 | if (pkt_len < ETH_HLEN) |
| 751 | return; |
| 752 | |
| 753 | proto = ntohs(*(uint16_t *)(pkt + 12)); |
| 754 | switch(proto) { |
| 755 | case ETH_P_ARP: |
| 756 | arp_input(pkt, pkt_len); |
| 757 | break; |
| 758 | case ETH_P_IP: |
| 759 | m = m_get(); |
| 760 | if (!m) |
| 761 | return; |
| 762 | /* Note: we add to align the IP header */ |
| 763 | if (M_FREEROOM(m) < pkt_len + 2) { |
| 764 | m_inc(m, pkt_len + 2); |
| 765 | } |
| 766 | m->m_len = pkt_len + 2; |
| 767 | memcpy(m->m_data + 2, pkt, pkt_len); |
| 768 | |
| 769 | m->m_data += 2 + ETH_HLEN; |
| 770 | m->m_len -= 2 + ETH_HLEN; |
| 771 | |
| 772 | ip_input(m); |
| 773 | break; |
| 774 | default: |
| 775 | break; |
| 776 | } |
| 777 | } |
| 778 | |
| 779 | /* output the IP packet to the ethernet device */ |
| 780 | void if_encap(const uint8_t *ip_data, int ip_data_len) |
| 781 | { |
| 782 | uint8_t buf[1600]; |
| 783 | struct ethhdr *eh = (struct ethhdr *)buf; |
| 784 | |
| 785 | if (ip_data_len + ETH_HLEN > sizeof(buf)) |
| 786 | return; |
| 787 | |
| 788 | if (!memcmp(client_ethaddr, zero_ethaddr, ETH_ALEN)) { |
| 789 | uint8_t arp_req[ETH_HLEN + sizeof(struct arphdr)]; |
| 790 | struct ethhdr *reh = (struct ethhdr *)arp_req; |
| 791 | struct arphdr *rah = (struct arphdr *)(arp_req + ETH_HLEN); |
| 792 | const struct ip *iph = (const struct ip *)ip_data; |
| 793 | |
| 794 | /* If the client addr is not known, there is no point in |
| 795 | sending the packet to it. Normally the sender should have |
| 796 | done an ARP request to get its MAC address. Here we do it |
| 797 | in place of sending the packet and we hope that the sender |
| 798 | will retry sending its packet. */ |
| 799 | memset(reh->h_dest, 0xff, ETH_ALEN); |
| 800 | memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1); |
| 801 | reh->h_source[5] = CTL_ALIAS; |
| 802 | reh->h_proto = htons(ETH_P_ARP); |
| 803 | rah->ar_hrd = htons(1); |
| 804 | rah->ar_pro = htons(ETH_P_IP); |
| 805 | rah->ar_hln = ETH_ALEN; |
| 806 | rah->ar_pln = 4; |
| 807 | rah->ar_op = htons(ARPOP_REQUEST); |
| 808 | /* source hw addr */ |
| 809 | memcpy(rah->ar_sha, special_ethaddr, ETH_ALEN - 1); |
| 810 | rah->ar_sha[5] = CTL_ALIAS; |
| 811 | /* source IP */ |
| 812 | ip_write32h(alias_addr_ip, rah->ar_sip); |
| 813 | /* target hw addr (none) */ |
| 814 | memset(rah->ar_tha, 0, ETH_ALEN); |
| 815 | /* target IP */ |
| 816 | ip_write( iph->ip_dst, rah->ar_tip ); |
| 817 | client_ip = iph->ip_dst; |
| 818 | slirp_output(arp_req, sizeof(arp_req)); |
| 819 | } else { |
| 820 | memcpy(eh->h_dest, client_ethaddr, ETH_ALEN); |
| 821 | memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1); |
| 822 | /* XXX: not correct */ |
| 823 | eh->h_source[5] = CTL_ALIAS; |
| 824 | eh->h_proto = htons(ETH_P_IP); |
| 825 | memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len); |
| 826 | slirp_output(buf, ip_data_len + ETH_HLEN); |
| 827 | } |
| 828 | } |
| 829 | |
rich cannings | 7339b55 | 2011-02-16 13:43:44 -0800 | [diff] [blame] | 830 | |
| 831 | /*---------------------------------------------------*/ |
| 832 | /* User mode network stack restrictions */ |
| 833 | struct fw_allow_entry { |
| 834 | struct fw_allow_entry* next; |
| 835 | unsigned long dst_addr; /* host byte order */ |
| 836 | /* Allowed port range. dst_lport should be the same as dst_hport for a |
| 837 | * single port. */ |
| 838 | unsigned short dst_lport; /* host byte order */ |
| 839 | unsigned short dst_hport; /* host byte order */ |
| 840 | }; |
| 841 | |
| 842 | static int drop_udp = 0; |
| 843 | static int drop_tcp = 0; |
| 844 | static struct fw_allow_entry* allow_tcp_entries = NULL; |
| 845 | static struct fw_allow_entry* allow_udp_entries = NULL; |
| 846 | static FILE* drop_log_fd = NULL; |
| 847 | static FILE* dns_log_fd = NULL; |
| 848 | static int max_dns_conns = -1; /* unlimited max DNS connections by default */ |
| 849 | static int slirp_net_forward_inited = 0; |
| 850 | |
| 851 | void slirp_drop_udp() { |
| 852 | drop_udp = 1; |
| 853 | } |
| 854 | |
| 855 | void slirp_drop_tcp() { |
| 856 | drop_tcp = 1; |
| 857 | } |
| 858 | |
| 859 | /* TCP traffic forwarding to a sink - If enabled, all TCP traffic to any |
| 860 | * ip/port that is not explicitly forwared using '-net-forward', and which would |
| 861 | * otherwise be dropped if '-drop-tcp' has been specified, is redirected to the |
| 862 | * specified ip:port |
| 863 | */ |
| 864 | int forward_dropped_tcp2sink = 0; |
| 865 | static unsigned long tcp_sink_ip; |
| 866 | int tcp_sink_port; |
| 867 | |
| 868 | void slirp_forward_dropped_tcp2sink(unsigned long sink_ip, int sink_port) { |
| 869 | tcp_sink_ip = sink_ip; |
| 870 | tcp_sink_port = sink_port; |
| 871 | forward_dropped_tcp2sink = 1; |
| 872 | } |
| 873 | |
| 874 | int slirp_should_forward_dropped_tcp2sink() { |
| 875 | return forward_dropped_tcp2sink; |
| 876 | } |
| 877 | |
| 878 | unsigned long slirp_get_tcp_sink_ip() { |
| 879 | return tcp_sink_ip; |
| 880 | } |
| 881 | int slirp_get_tcp_sink_port() { |
| 882 | return tcp_sink_port; |
| 883 | } |
| 884 | |
| 885 | /* Fill in the firewall rules. dst_lport and dst_hport are in host byte order */ |
| 886 | void slirp_add_allow(unsigned long dst_addr, |
| 887 | int dst_lport, int dst_hport, |
| 888 | u_int8_t proto) { |
| 889 | |
| 890 | struct fw_allow_entry** ate; |
| 891 | switch (proto) { |
| 892 | case IPPROTO_TCP: |
| 893 | ate = &allow_tcp_entries; |
| 894 | break; |
| 895 | case IPPROTO_UDP: |
| 896 | ate = &allow_udp_entries; |
| 897 | break; |
| 898 | default: |
| 899 | return; // unknown protocol for the FW |
| 900 | } |
| 901 | |
| 902 | while(*ate != NULL) |
| 903 | ate = &(*ate)->next; |
| 904 | |
| 905 | *ate = malloc(sizeof(**ate)); |
| 906 | if (*ate == NULL) { |
| 907 | DEBUG_MISC((dfd, |
| 908 | "Unable to create new firewall record, malloc failed\n")); |
| 909 | exit(-1); |
| 910 | } |
| 911 | |
| 912 | (*ate)->next = NULL; |
| 913 | (*ate)->dst_addr = dst_addr; |
| 914 | (*ate)->dst_lport = dst_lport; |
| 915 | (*ate)->dst_hport = dst_hport; |
| 916 | } |
| 917 | |
| 918 | void slirp_drop_log_fd(FILE* fd) { |
| 919 | drop_log_fd = fd; |
| 920 | } |
| 921 | |
| 922 | void slirp_dns_log_fd(FILE* fd) { |
| 923 | dns_log_fd = fd; |
| 924 | } |
| 925 | |
rich cannings | d952f28 | 2011-03-01 15:40:09 -0800 | [diff] [blame] | 926 | FILE* get_slirp_drop_log_fd(void) { |
| 927 | return drop_log_fd; |
| 928 | } |
| 929 | |
| 930 | FILE* get_slirp_dns_log_fd(void) { |
| 931 | return dns_log_fd; |
| 932 | } |
| 933 | |
rich cannings | 7339b55 | 2011-02-16 13:43:44 -0800 | [diff] [blame] | 934 | /* Address and ports are in host byte order */ |
| 935 | int slirp_should_drop(unsigned long dst_addr, |
| 936 | int dst_port, |
| 937 | u_int8_t proto) { |
| 938 | |
| 939 | struct fw_allow_entry* ate; |
| 940 | |
| 941 | switch (proto) { |
| 942 | case IPPROTO_TCP: |
| 943 | if (drop_tcp != 0) |
| 944 | ate = allow_tcp_entries; |
| 945 | else |
| 946 | return 0; |
| 947 | break; |
| 948 | case IPPROTO_UDP: |
| 949 | if (drop_udp != 0) |
| 950 | ate = allow_udp_entries; |
| 951 | else |
| 952 | return 0; |
| 953 | break; |
| 954 | default: |
| 955 | return 1; // unknown protocol for the FW |
| 956 | } |
| 957 | |
| 958 | while(ate) { |
| 959 | if ((ate->dst_lport <= dst_port) && (dst_port <= ate->dst_hport)) { |
| 960 | // allow any destination if 0 |
| 961 | if (ate->dst_addr == 0 || ate->dst_addr == dst_addr) |
| 962 | return 0; |
| 963 | } |
| 964 | ate = ate->next; |
| 965 | } |
| 966 | |
| 967 | return 1; |
| 968 | } |
| 969 | |
| 970 | /* |
| 971 | * log DNS requests in a separate log |
| 972 | */ |
| 973 | int |
| 974 | slirp_log_dns(struct mbuf* m, int dropped) { |
| 975 | char dns_query[256]; // max allowable dns name size |
| 976 | int c = 0; |
| 977 | int i= 0; |
| 978 | int index = 0; |
| 979 | int offset = 40 + 1; // udp/ip headers length + 1; |
| 980 | int trim_bytes = 4; |
| 981 | |
| 982 | if (!dns_log_fd) |
| 983 | return -1; |
| 984 | |
| 985 | /* We assume one DNS name per query: 300 = 255 (max dns name length) |
| 986 | * + 40 (udp/ip hdr) + 1 byte DNS peamble + 4 bytes DNS suffix |
| 987 | */ |
| 988 | if (m->m_len < offset || m->m_len > 300) { |
| 989 | DEBUG_MISC((dfd,"Malformed DNS qeury, length %d \n", (int)m->m_len)); |
| 990 | return -1; |
| 991 | } |
| 992 | for (i = offset; i < m->m_len - trim_bytes && index < sizeof(dns_query); i++, index++) { |
| 993 | c = m->m_data[i]; |
| 994 | if (c < ' ' || c > '~') |
| 995 | c = '.'; |
| 996 | |
| 997 | dns_query[index] = (char)c; |
| 998 | } |
| 999 | dns_query[index] = '\0'; |
| 1000 | if (!dropped) { |
| 1001 | fprintf(dns_log_fd, "Sent DNS query for, %s\n" , dns_query); |
| 1002 | } else { |
| 1003 | fprintf(dns_log_fd, "Dropped DNS query for, %s\n" , dns_query); |
| 1004 | } |
| 1005 | fflush(dns_log_fd); |
| 1006 | return 1; |
| 1007 | } |
| 1008 | |
| 1009 | /* |
| 1010 | * log DNS requests in a separate log |
| 1011 | */ |
| 1012 | int |
| 1013 | slirp_dump_dns(struct mbuf* m) { |
| 1014 | |
| 1015 | if (!dns_log_fd) |
| 1016 | return 0; |
| 1017 | // first we write the length of the record then the record (IP packet) |
| 1018 | if (!fwrite(&(m->m_len), sizeof(int), 1, dns_log_fd) || |
| 1019 | !fwrite(m->m_data, m->m_len, 1, dns_log_fd)) { |
| 1020 | return 0; |
| 1021 | } |
| 1022 | |
| 1023 | fflush(dns_log_fd); |
| 1024 | return 1; |
| 1025 | } |
| 1026 | |
| 1027 | /* Log dropped/accepted packet info */ |
| 1028 | int slirp_drop_log(const char* format, ...) { |
| 1029 | va_list args; |
| 1030 | |
| 1031 | if (!drop_log_fd) |
| 1032 | return 0; |
| 1033 | |
| 1034 | va_start(args, format); |
| 1035 | vfprintf(drop_log_fd, format, args); |
| 1036 | va_end(args); |
| 1037 | |
| 1038 | fflush(drop_log_fd); |
| 1039 | |
| 1040 | return 1; |
| 1041 | } |
| 1042 | |
| 1043 | |
| 1044 | /* Set max DNS requests allowed to be issued from the VM */ |
| 1045 | void slirp_set_max_dns_conns(int num_conns) { |
| 1046 | max_dns_conns = num_conns; |
| 1047 | } |
| 1048 | |
| 1049 | int slirp_get_max_dns_conns() { |
| 1050 | return max_dns_conns; |
| 1051 | } |
| 1052 | |
| 1053 | /* generic guest network redirection functionality for ipv4 */ |
| 1054 | struct net_forward_entry { |
| 1055 | QTAILQ_ENTRY(net_forward_entry) next; |
| 1056 | /* ip addresses are also in host byte order */ |
| 1057 | unsigned long dest_ip; /* the destination address they try to contact */ |
| 1058 | unsigned long dest_mask; /* the mask to apply to the address for matching */ |
| 1059 | /* Range of ports they were trying to contact. In case of a single port, |
| 1060 | * dest_lport should be the same as dest_hport */ |
| 1061 | int dest_lport; /* Host byte order */ |
| 1062 | int dest_hport; /* Host byte order */ |
| 1063 | |
| 1064 | unsigned long redirect_ip; |
| 1065 | int redirect_port; /* Host byte order */ |
| 1066 | }; |
| 1067 | |
| 1068 | static QTAILQ_HEAD(net_forwardq, net_forward_entry) net_forwards; |
| 1069 | |
| 1070 | static void slirp_net_forward_init(void) |
| 1071 | { |
| 1072 | if (!slirp_net_forward_inited) { |
| 1073 | QTAILQ_INIT(&net_forwards); |
| 1074 | slirp_net_forward_inited = 1; |
| 1075 | } |
| 1076 | } |
| 1077 | |
| 1078 | /* all addresses and ports ae in host byte order */ |
| 1079 | void slirp_add_net_forward(unsigned long dest_ip, unsigned long dest_mask, |
| 1080 | int dest_lport, int dest_hport, |
| 1081 | unsigned long redirect_ip, int redirect_port) |
| 1082 | { |
| 1083 | slirp_net_forward_init(); |
| 1084 | |
| 1085 | struct net_forward_entry *entry = malloc(sizeof(*entry)); |
| 1086 | if (entry == NULL) { |
| 1087 | DEBUG_MISC((dfd, "Unable to create new forwarding entry, malloc failed\n")); |
| 1088 | exit(-1); |
| 1089 | } |
| 1090 | |
| 1091 | entry->dest_ip = dest_ip; |
| 1092 | entry->dest_mask = dest_mask; |
| 1093 | entry->dest_lport = dest_lport; |
| 1094 | entry->dest_hport = dest_hport; |
| 1095 | entry->redirect_ip = redirect_ip; |
| 1096 | entry->redirect_port = redirect_port; |
| 1097 | |
| 1098 | QTAILQ_INSERT_TAIL(&net_forwards, entry, next); |
| 1099 | } |
| 1100 | |
| 1101 | /* remote_port and redir_port arguments |
| 1102 | * are in network byte order (tcp_subr.c) */ |
| 1103 | int slirp_should_net_forward(unsigned long remote_ip, int remote_port, |
| 1104 | unsigned long *redirect_ip, int *redirect_port) |
| 1105 | { |
| 1106 | struct net_forward_entry *entry; |
| 1107 | |
| 1108 | for (entry = net_forwards.tqh_first; |
| 1109 | entry != NULL; entry = entry->next.tqe_next) { |
| 1110 | |
| 1111 | if ((entry->dest_lport <= remote_port) |
| 1112 | && (remote_port <= entry->dest_hport)) { |
| 1113 | if ((entry->dest_ip & entry->dest_mask) |
| 1114 | == (remote_ip & entry->dest_mask)) { |
| 1115 | *redirect_ip = entry->redirect_ip; |
| 1116 | *redirect_port = entry->redirect_port; |
| 1117 | return 1; |
| 1118 | } |
| 1119 | } |
| 1120 | } |
| 1121 | |
| 1122 | return 0; |
| 1123 | } |
| 1124 | |
| 1125 | /*---------------------------------------------------*/ |
| 1126 | |
| 1127 | |
| 1128 | |
| 1129 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1130 | static void _slirp_redir_loop(void (*func)(void *opaque, int is_udp, |
| 1131 | const SockAddress *laddr, |
| 1132 | const SockAddress *faddr), |
| 1133 | void *opaque, int is_udp) |
| 1134 | { |
| 1135 | struct socket *head = (is_udp ? &udb : &tcb); |
| 1136 | struct socket *so; |
| 1137 | |
| 1138 | for (so = head->so_next; so != head; so = so->so_next) { |
| 1139 | SockAddress local, foreign; |
| 1140 | |
| 1141 | sock_address_init_inet(&local, so->so_laddr_ip, so->so_laddr_port); |
| 1142 | sock_address_init_inet(&foreign, so->so_faddr_ip, so->so_faddr_port); |
| 1143 | func(opaque, is_udp, |
| 1144 | &local, &foreign); |
| 1145 | } |
| 1146 | } |
| 1147 | |
| 1148 | void slirp_redir_loop(void (*func)(void *opaque, int is_udp, |
| 1149 | const SockAddress *laddr, |
| 1150 | const SockAddress *faddr), |
| 1151 | void *opaque) |
| 1152 | { |
| 1153 | _slirp_redir_loop(func, opaque, 0); |
| 1154 | _slirp_redir_loop(func, opaque, 1); |
| 1155 | } |
| 1156 | |
| 1157 | /* Unlistens a redirection |
| 1158 | * |
| 1159 | * Return value: number of redirs removed */ |
| 1160 | int slirp_redir_rm(int is_udp, int host_port) |
| 1161 | { |
| 1162 | struct socket *so; |
| 1163 | struct socket *head = (is_udp ? &udb : &tcb); |
| 1164 | int n = 0; |
| 1165 | |
| 1166 | loop_again: |
| 1167 | for (so = head->so_next; so != head; so = so->so_next) { |
| 1168 | if (so->so_faddr_port == host_port) { |
| 1169 | close(so->s); |
| 1170 | sofree(so); |
| 1171 | n++; |
| 1172 | goto loop_again; |
| 1173 | } |
| 1174 | } |
| 1175 | |
| 1176 | return n; |
| 1177 | } |
| 1178 | |
| 1179 | int slirp_redir(int is_udp, int host_port, |
| 1180 | uint32_t guest_ip, int guest_port) |
| 1181 | { |
| 1182 | if (is_udp) { |
| 1183 | if (!udp_listen(host_port, |
| 1184 | guest_ip, |
| 1185 | guest_port, 0)) |
| 1186 | return -1; |
| 1187 | } else { |
| 1188 | if (!solisten(host_port, guest_ip, guest_port, 0)) |
| 1189 | return -1; |
| 1190 | } |
| 1191 | return 0; |
| 1192 | } |
| 1193 | |
| 1194 | int slirp_unredir(int is_udp, int host_port) |
| 1195 | { |
| 1196 | if (is_udp) |
| 1197 | return udp_unlisten( host_port ); |
| 1198 | else |
| 1199 | return sounlisten( host_port ); |
| 1200 | } |
| 1201 | |
| 1202 | int slirp_add_exec(int do_pty, const void *args, int addr_low_byte, |
| 1203 | int guest_port) |
| 1204 | { |
| 1205 | return add_exec(&exec_list, do_pty, (char *)args, |
| 1206 | addr_low_byte, htons(guest_port)); |
| 1207 | } |
| 1208 | |
| 1209 | ssize_t slirp_send(struct socket *so, const void *buf, size_t len, int flags) |
| 1210 | { |
| 1211 | if (so->s == -1 && so->extra) { |
| 1212 | qemu_chr_write(so->extra, buf, len); |
| 1213 | return len; |
| 1214 | } |
| 1215 | |
| 1216 | return send(so->s, buf, len, flags); |
| 1217 | } |
| 1218 | |
| 1219 | static struct socket *slirp_find_ctl_socket(int addr_low_byte, int guest_port) |
| 1220 | { |
| 1221 | struct socket *so; |
| 1222 | |
| 1223 | for (so = tcb.so_next; so != &tcb; so = so->so_next) { |
| 1224 | if ((so->so_faddr_ip & 0xffffff00) == |
| 1225 | special_addr_ip |
| 1226 | && ((so->so_faddr_port & 0xff) == |
| 1227 | addr_low_byte) |
| 1228 | && so->so_faddr_port == guest_port) |
| 1229 | return so; |
| 1230 | } |
| 1231 | |
| 1232 | return NULL; |
| 1233 | } |
| 1234 | |
| 1235 | size_t slirp_socket_can_recv(int addr_low_byte, int guest_port) |
| 1236 | { |
| 1237 | struct iovec iov[2]; |
| 1238 | struct socket *so; |
| 1239 | |
| 1240 | if (!link_up) |
| 1241 | return 0; |
| 1242 | |
| 1243 | so = slirp_find_ctl_socket(addr_low_byte, guest_port); |
| 1244 | |
| 1245 | if (!so || so->so_state & SS_NOFDREF) |
| 1246 | return 0; |
| 1247 | |
| 1248 | if (!CONN_CANFRCV(so) || so->so_snd.sb_cc >= (so->so_snd.sb_datalen/2)) |
| 1249 | return 0; |
| 1250 | |
| 1251 | return sopreprbuf(so, iov, NULL); |
| 1252 | } |
| 1253 | |
| 1254 | void slirp_socket_recv(int addr_low_byte, int guest_port, const uint8_t *buf, |
| 1255 | int size) |
| 1256 | { |
| 1257 | int ret; |
| 1258 | struct socket *so = slirp_find_ctl_socket(addr_low_byte, guest_port); |
| 1259 | |
| 1260 | if (!so) |
| 1261 | return; |
| 1262 | |
| 1263 | ret = soreadbuf(so, (const char *)buf, size); |
| 1264 | |
| 1265 | if (ret > 0) |
| 1266 | tcp_output(sototcpcb(so)); |
| 1267 | } |
| 1268 | |
| 1269 | static void slirp_tcp_save(QEMUFile *f, struct tcpcb *tp) |
| 1270 | { |
| 1271 | int i; |
| 1272 | |
| 1273 | qemu_put_sbe16(f, tp->t_state); |
| 1274 | for (i = 0; i < TCPT_NTIMERS; i++) |
| 1275 | qemu_put_sbe16(f, tp->t_timer[i]); |
| 1276 | qemu_put_sbe16(f, tp->t_rxtshift); |
| 1277 | qemu_put_sbe16(f, tp->t_rxtcur); |
| 1278 | qemu_put_sbe16(f, tp->t_dupacks); |
| 1279 | qemu_put_be16(f, tp->t_maxseg); |
| 1280 | qemu_put_sbyte(f, tp->t_force); |
| 1281 | qemu_put_be16(f, tp->t_flags); |
| 1282 | qemu_put_be32(f, tp->snd_una); |
| 1283 | qemu_put_be32(f, tp->snd_nxt); |
| 1284 | qemu_put_be32(f, tp->snd_up); |
| 1285 | qemu_put_be32(f, tp->snd_wl1); |
| 1286 | qemu_put_be32(f, tp->snd_wl2); |
| 1287 | qemu_put_be32(f, tp->iss); |
| 1288 | qemu_put_be32(f, tp->snd_wnd); |
| 1289 | qemu_put_be32(f, tp->rcv_wnd); |
| 1290 | qemu_put_be32(f, tp->rcv_nxt); |
| 1291 | qemu_put_be32(f, tp->rcv_up); |
| 1292 | qemu_put_be32(f, tp->irs); |
| 1293 | qemu_put_be32(f, tp->rcv_adv); |
| 1294 | qemu_put_be32(f, tp->snd_max); |
| 1295 | qemu_put_be32(f, tp->snd_cwnd); |
| 1296 | qemu_put_be32(f, tp->snd_ssthresh); |
| 1297 | qemu_put_sbe16(f, tp->t_idle); |
| 1298 | qemu_put_sbe16(f, tp->t_rtt); |
| 1299 | qemu_put_be32(f, tp->t_rtseq); |
| 1300 | qemu_put_sbe16(f, tp->t_srtt); |
| 1301 | qemu_put_sbe16(f, tp->t_rttvar); |
| 1302 | qemu_put_be16(f, tp->t_rttmin); |
| 1303 | qemu_put_be32(f, tp->max_sndwnd); |
| 1304 | qemu_put_byte(f, tp->t_oobflags); |
| 1305 | qemu_put_byte(f, tp->t_iobc); |
| 1306 | qemu_put_sbe16(f, tp->t_softerror); |
| 1307 | qemu_put_byte(f, tp->snd_scale); |
| 1308 | qemu_put_byte(f, tp->rcv_scale); |
| 1309 | qemu_put_byte(f, tp->request_r_scale); |
| 1310 | qemu_put_byte(f, tp->requested_s_scale); |
| 1311 | qemu_put_be32(f, tp->ts_recent); |
| 1312 | qemu_put_be32(f, tp->ts_recent_age); |
| 1313 | qemu_put_be32(f, tp->last_ack_sent); |
| 1314 | } |
| 1315 | |
| 1316 | static void slirp_sbuf_save(QEMUFile *f, struct sbuf *sbuf) |
| 1317 | { |
| 1318 | uint32_t off; |
| 1319 | |
| 1320 | qemu_put_be32(f, sbuf->sb_cc); |
| 1321 | qemu_put_be32(f, sbuf->sb_datalen); |
| 1322 | off = (uint32_t)(sbuf->sb_wptr - sbuf->sb_data); |
| 1323 | qemu_put_sbe32(f, off); |
| 1324 | off = (uint32_t)(sbuf->sb_rptr - sbuf->sb_data); |
| 1325 | qemu_put_sbe32(f, off); |
| 1326 | qemu_put_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen); |
| 1327 | } |
| 1328 | |
| 1329 | static void slirp_socket_save(QEMUFile *f, struct socket *so) |
| 1330 | { |
| 1331 | qemu_put_be32(f, so->so_urgc); |
| 1332 | qemu_put_be32(f, so->so_faddr_ip); |
| 1333 | qemu_put_be32(f, so->so_laddr_ip); |
| 1334 | qemu_put_be16(f, so->so_faddr_port); |
| 1335 | qemu_put_be16(f, so->so_laddr_port); |
| 1336 | qemu_put_byte(f, so->so_iptos); |
| 1337 | qemu_put_byte(f, so->so_emu); |
| 1338 | qemu_put_byte(f, so->so_type); |
| 1339 | qemu_put_be32(f, so->so_state); |
| 1340 | slirp_sbuf_save(f, &so->so_rcv); |
| 1341 | slirp_sbuf_save(f, &so->so_snd); |
| 1342 | slirp_tcp_save(f, so->so_tcpcb); |
| 1343 | } |
| 1344 | |
| 1345 | static void slirp_state_save(QEMUFile *f, void *opaque) |
| 1346 | { |
| 1347 | struct ex_list *ex_ptr; |
| 1348 | |
| 1349 | for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) |
| 1350 | if (ex_ptr->ex_pty == 3) { |
| 1351 | struct socket *so; |
| 1352 | so = slirp_find_ctl_socket(ex_ptr->ex_addr, ntohs(ex_ptr->ex_fport)); |
| 1353 | if (!so) |
| 1354 | continue; |
| 1355 | |
| 1356 | qemu_put_byte(f, 42); |
| 1357 | slirp_socket_save(f, so); |
| 1358 | } |
| 1359 | qemu_put_byte(f, 0); |
| 1360 | } |
| 1361 | |
| 1362 | static void slirp_tcp_load(QEMUFile *f, struct tcpcb *tp) |
| 1363 | { |
| 1364 | int i; |
| 1365 | |
| 1366 | tp->t_state = qemu_get_sbe16(f); |
| 1367 | for (i = 0; i < TCPT_NTIMERS; i++) |
| 1368 | tp->t_timer[i] = qemu_get_sbe16(f); |
| 1369 | tp->t_rxtshift = qemu_get_sbe16(f); |
| 1370 | tp->t_rxtcur = qemu_get_sbe16(f); |
| 1371 | tp->t_dupacks = qemu_get_sbe16(f); |
| 1372 | tp->t_maxseg = qemu_get_be16(f); |
| 1373 | tp->t_force = qemu_get_sbyte(f); |
| 1374 | tp->t_flags = qemu_get_be16(f); |
| 1375 | tp->snd_una = qemu_get_be32(f); |
| 1376 | tp->snd_nxt = qemu_get_be32(f); |
| 1377 | tp->snd_up = qemu_get_be32(f); |
| 1378 | tp->snd_wl1 = qemu_get_be32(f); |
| 1379 | tp->snd_wl2 = qemu_get_be32(f); |
| 1380 | tp->iss = qemu_get_be32(f); |
| 1381 | tp->snd_wnd = qemu_get_be32(f); |
| 1382 | tp->rcv_wnd = qemu_get_be32(f); |
| 1383 | tp->rcv_nxt = qemu_get_be32(f); |
| 1384 | tp->rcv_up = qemu_get_be32(f); |
| 1385 | tp->irs = qemu_get_be32(f); |
| 1386 | tp->rcv_adv = qemu_get_be32(f); |
| 1387 | tp->snd_max = qemu_get_be32(f); |
| 1388 | tp->snd_cwnd = qemu_get_be32(f); |
| 1389 | tp->snd_ssthresh = qemu_get_be32(f); |
| 1390 | tp->t_idle = qemu_get_sbe16(f); |
| 1391 | tp->t_rtt = qemu_get_sbe16(f); |
| 1392 | tp->t_rtseq = qemu_get_be32(f); |
| 1393 | tp->t_srtt = qemu_get_sbe16(f); |
| 1394 | tp->t_rttvar = qemu_get_sbe16(f); |
| 1395 | tp->t_rttmin = qemu_get_be16(f); |
| 1396 | tp->max_sndwnd = qemu_get_be32(f); |
| 1397 | tp->t_oobflags = qemu_get_byte(f); |
| 1398 | tp->t_iobc = qemu_get_byte(f); |
| 1399 | tp->t_softerror = qemu_get_sbe16(f); |
| 1400 | tp->snd_scale = qemu_get_byte(f); |
| 1401 | tp->rcv_scale = qemu_get_byte(f); |
| 1402 | tp->request_r_scale = qemu_get_byte(f); |
| 1403 | tp->requested_s_scale = qemu_get_byte(f); |
| 1404 | tp->ts_recent = qemu_get_be32(f); |
| 1405 | tp->ts_recent_age = qemu_get_be32(f); |
| 1406 | tp->last_ack_sent = qemu_get_be32(f); |
| 1407 | tcp_template(tp); |
| 1408 | } |
| 1409 | |
| 1410 | static int slirp_sbuf_load(QEMUFile *f, struct sbuf *sbuf) |
| 1411 | { |
| 1412 | uint32_t off, sb_cc, sb_datalen; |
| 1413 | |
| 1414 | sb_cc = qemu_get_be32(f); |
| 1415 | sb_datalen = qemu_get_be32(f); |
| 1416 | |
| 1417 | sbreserve(sbuf, sb_datalen); |
| 1418 | |
| 1419 | if (sbuf->sb_datalen != sb_datalen) |
| 1420 | return -ENOMEM; |
| 1421 | |
| 1422 | sbuf->sb_cc = sb_cc; |
| 1423 | |
| 1424 | off = qemu_get_sbe32(f); |
| 1425 | sbuf->sb_wptr = sbuf->sb_data + off; |
| 1426 | off = qemu_get_sbe32(f); |
| 1427 | sbuf->sb_rptr = sbuf->sb_data + off; |
| 1428 | qemu_get_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen); |
| 1429 | |
| 1430 | return 0; |
| 1431 | } |
| 1432 | |
| 1433 | static int slirp_socket_load(QEMUFile *f, struct socket *so) |
| 1434 | { |
| 1435 | if (tcp_attach(so) < 0) |
| 1436 | return -ENOMEM; |
| 1437 | |
| 1438 | so->so_urgc = qemu_get_be32(f); |
| 1439 | so->so_faddr_ip = qemu_get_be32(f); |
| 1440 | so->so_laddr_ip = qemu_get_be32(f); |
| 1441 | so->so_faddr_port = qemu_get_be16(f); |
| 1442 | so->so_laddr_port = qemu_get_be16(f); |
| 1443 | so->so_iptos = qemu_get_byte(f); |
| 1444 | so->so_emu = qemu_get_byte(f); |
| 1445 | so->so_type = qemu_get_byte(f); |
| 1446 | so->so_state = qemu_get_be32(f); |
| 1447 | if (slirp_sbuf_load(f, &so->so_rcv) < 0) |
| 1448 | return -ENOMEM; |
| 1449 | if (slirp_sbuf_load(f, &so->so_snd) < 0) |
| 1450 | return -ENOMEM; |
| 1451 | slirp_tcp_load(f, so->so_tcpcb); |
| 1452 | |
| 1453 | return 0; |
| 1454 | } |
| 1455 | |
| 1456 | static int slirp_state_load(QEMUFile *f, void *opaque, int version_id) |
| 1457 | { |
| 1458 | struct ex_list *ex_ptr; |
| 1459 | int r; |
| 1460 | |
| 1461 | while ((r = qemu_get_byte(f))) { |
| 1462 | int ret; |
| 1463 | struct socket *so = socreate(); |
| 1464 | |
| 1465 | if (!so) |
| 1466 | return -ENOMEM; |
| 1467 | |
| 1468 | ret = slirp_socket_load(f, so); |
| 1469 | |
| 1470 | if (ret < 0) |
| 1471 | return ret; |
| 1472 | |
| 1473 | if ((so->so_faddr_ip & 0xffffff00) != special_addr_ip) |
| 1474 | return -EINVAL; |
| 1475 | |
| 1476 | for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) |
| 1477 | if (ex_ptr->ex_pty == 3 && |
| 1478 | (so->so_faddr_ip & 0xff) == ex_ptr->ex_addr && |
| 1479 | so->so_faddr_port == ex_ptr->ex_fport) |
| 1480 | break; |
| 1481 | |
| 1482 | if (!ex_ptr) |
| 1483 | return -EINVAL; |
| 1484 | |
| 1485 | so->extra = (void *)ex_ptr->ex_exec; |
| 1486 | } |
| 1487 | |
| 1488 | return 0; |
| 1489 | } |