Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_divert.c
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1 /*- 2 * Copyright (c) 1982, 1986, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: src/sys/netinet/ip_divert.c,v 1.98.2.6 2005/05/27 12:32:29 glebius Exp $ 30 */ 31 32 #include "opt_inet.h" 33 #include "opt_ipfw.h" 34 #include "opt_ipdivert.h" 35 #include "opt_ipsec.h" 36 #include "opt_mac.h" 37 38 #ifndef INET 39 #error "IPDIVERT requires INET." 40 #endif 41 42 #include <sys/param.h> 43 #include <sys/kernel.h> 44 #include <sys/lock.h> 45 #include <sys/malloc.h> 46 #include <sys/mac.h> 47 #include <sys/mbuf.h> 48 #include <sys/proc.h> 49 #include <sys/protosw.h> 50 #include <sys/signalvar.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/sx.h> 54 #include <sys/sysctl.h> 55 #include <sys/systm.h> 56 57 #include <vm/uma.h> 58 59 #include <net/if.h> 60 #include <net/route.h> 61 62 #include <netinet/in.h> 63 #include <netinet/in_pcb.h> 64 #include <netinet/in_systm.h> 65 #include <netinet/in_var.h> 66 #include <netinet/ip.h> 67 #include <netinet/ip_divert.h> 68 #include <netinet/ip_var.h> 69 #include <netinet/ip_fw.h> 70 71 /* 72 * Divert sockets 73 */ 74 75 /* 76 * Allocate enough space to hold a full IP packet 77 */ 78 #define DIVSNDQ (65536 + 100) 79 #define DIVRCVQ (65536 + 100) 80 81 /* 82 * Divert sockets work in conjunction with ipfw, see the divert(4) 83 * manpage for features. 84 * Internally, packets selected by ipfw in ip_input() or ip_output(), 85 * and never diverted before, are passed to the input queue of the 86 * divert socket with a given 'divert_port' number (as specified in 87 * the matching ipfw rule), and they are tagged with a 16 bit cookie 88 * (representing the rule number of the matching ipfw rule), which 89 * is passed to process reading from the socket. 90 * 91 * Packets written to the divert socket are again tagged with a cookie 92 * (usually the same as above) and a destination address. 93 * If the destination address is INADDR_ANY then the packet is 94 * treated as outgoing and sent to ip_output(), otherwise it is 95 * treated as incoming and sent to ip_input(). 96 * In both cases, the packet is tagged with the cookie. 97 * 98 * On reinjection, processing in ip_input() and ip_output() 99 * will be exactly the same as for the original packet, except that 100 * ipfw processing will start at the rule number after the one 101 * written in the cookie (so, tagging a packet with a cookie of 0 102 * will cause it to be effectively considered as a standard packet). 103 */ 104 105 /* Internal variables */ 106 static struct inpcbhead divcb; 107 static struct inpcbinfo divcbinfo; 108 109 static u_long div_sendspace = DIVSNDQ; /* XXX sysctl ? */ 110 static u_long div_recvspace = DIVRCVQ; /* XXX sysctl ? */ 111 112 /* 113 * Initialize divert connection block queue. 114 */ 115 void 116 div_init(void) 117 { 118 INP_INFO_LOCK_INIT(&divcbinfo, "div"); 119 LIST_INIT(&divcb); 120 divcbinfo.listhead = &divcb; 121 /* 122 * XXX We don't use the hash list for divert IP, but it's easier 123 * to allocate a one entry hash list than it is to check all 124 * over the place for hashbase == NULL. 125 */ 126 divcbinfo.hashbase = hashinit(1, M_PCB, &divcbinfo.hashmask); 127 divcbinfo.porthashbase = hashinit(1, M_PCB, &divcbinfo.porthashmask); 128 divcbinfo.ipi_zone = uma_zcreate("divcb", sizeof(struct inpcb), 129 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 130 uma_zone_set_max(divcbinfo.ipi_zone, maxsockets); 131 } 132 133 /* 134 * IPPROTO_DIVERT is not in the real IP protocol number space; this 135 * function should never be called. Just in case, drop any packets. 136 */ 137 void 138 div_input(struct mbuf *m, int off) 139 { 140 ipstat.ips_noproto++; 141 m_freem(m); 142 } 143 144 /* 145 * Divert a packet by passing it up to the divert socket at port 'port'. 146 * 147 * Setup generic address and protocol structures for div_input routine, 148 * then pass them along with mbuf chain. 149 */ 150 void 151 divert_packet(struct mbuf *m, int incoming) 152 { 153 struct ip *ip; 154 struct inpcb *inp; 155 struct socket *sa; 156 u_int16_t nport; 157 struct sockaddr_in divsrc; 158 struct m_tag *mtag; 159 160 mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL); 161 if (mtag == NULL) { 162 printf("%s: no divert tag\n", __func__); 163 m_freem(m); 164 return; 165 } 166 /* Assure header */ 167 if (m->m_len < sizeof(struct ip) && 168 (m = m_pullup(m, sizeof(struct ip))) == 0) 169 return; 170 ip = mtod(m, struct ip *); 171 172 /* Delayed checksums are currently not compatible with divert. */ 173 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 174 ip->ip_len = ntohs(ip->ip_len); 175 in_delayed_cksum(m); 176 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 177 ip->ip_len = htons(ip->ip_len); 178 } 179 180 /* 181 * Record receive interface address, if any. 182 * But only for incoming packets. 183 */ 184 bzero(&divsrc, sizeof(divsrc)); 185 divsrc.sin_len = sizeof(divsrc); 186 divsrc.sin_family = AF_INET; 187 divsrc.sin_port = divert_cookie(mtag); /* record matching rule */ 188 if (incoming) { 189 struct ifaddr *ifa; 190 191 /* Sanity check */ 192 M_ASSERTPKTHDR(m); 193 194 /* Find IP address for receive interface */ 195 TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrhead, ifa_link) { 196 if (ifa->ifa_addr == NULL) 197 continue; 198 if (ifa->ifa_addr->sa_family != AF_INET) 199 continue; 200 divsrc.sin_addr = 201 ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr; 202 break; 203 } 204 } 205 /* 206 * Record the incoming interface name whenever we have one. 207 */ 208 if (m->m_pkthdr.rcvif) { 209 /* 210 * Hide the actual interface name in there in the 211 * sin_zero array. XXX This needs to be moved to a 212 * different sockaddr type for divert, e.g. 213 * sockaddr_div with multiple fields like 214 * sockaddr_dl. Presently we have only 7 bytes 215 * but that will do for now as most interfaces 216 * are 4 or less + 2 or less bytes for unit. 217 * There is probably a faster way of doing this, 218 * possibly taking it from the sockaddr_dl on the iface. 219 * This solves the problem of a P2P link and a LAN interface 220 * having the same address, which can result in the wrong 221 * interface being assigned to the packet when fed back 222 * into the divert socket. Theoretically if the daemon saves 223 * and re-uses the sockaddr_in as suggested in the man pages, 224 * this iface name will come along for the ride. 225 * (see div_output for the other half of this.) 226 */ 227 strlcpy(divsrc.sin_zero, m->m_pkthdr.rcvif->if_xname, 228 sizeof(divsrc.sin_zero)); 229 } 230 231 /* Put packet on socket queue, if any */ 232 sa = NULL; 233 nport = htons((u_int16_t)divert_info(mtag)); 234 INP_INFO_RLOCK(&divcbinfo); 235 LIST_FOREACH(inp, &divcb, inp_list) { 236 INP_LOCK(inp); 237 /* XXX why does only one socket match? */ 238 if (inp->inp_lport == nport) { 239 sa = inp->inp_socket; 240 SOCKBUF_LOCK(&sa->so_rcv); 241 if (sbappendaddr_locked(&sa->so_rcv, 242 (struct sockaddr *)&divsrc, m, 243 (struct mbuf *)0) == 0) { 244 SOCKBUF_UNLOCK(&sa->so_rcv); 245 sa = NULL; /* force mbuf reclaim below */ 246 } else 247 sorwakeup_locked(sa); 248 INP_UNLOCK(inp); 249 break; 250 } 251 INP_UNLOCK(inp); 252 } 253 INP_INFO_RUNLOCK(&divcbinfo); 254 if (sa == NULL) { 255 m_freem(m); 256 ipstat.ips_noproto++; 257 ipstat.ips_delivered--; 258 } 259 } 260 261 /* 262 * Deliver packet back into the IP processing machinery. 263 * 264 * If no address specified, or address is 0.0.0.0, send to ip_output(); 265 * otherwise, send to ip_input() and mark as having been received on 266 * the interface with that address. 267 */ 268 static int 269 div_output(struct socket *so, struct mbuf *m, 270 struct sockaddr_in *sin, struct mbuf *control) 271 { 272 struct m_tag *mtag; 273 struct divert_tag *dt; 274 int error = 0; 275 276 /* 277 * An mbuf may hasn't come from userland, but we pretend 278 * that it has. 279 */ 280 m->m_pkthdr.rcvif = NULL; 281 m->m_nextpkt = NULL; 282 283 if (control) 284 m_freem(control); /* XXX */ 285 286 if ((mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL)) == NULL) { 287 mtag = m_tag_get(PACKET_TAG_DIVERT, sizeof(struct divert_tag), 288 M_NOWAIT | M_ZERO); 289 if (mtag == NULL) { 290 error = ENOBUFS; 291 goto cantsend; 292 } 293 dt = (struct divert_tag *)(mtag+1); 294 m_tag_prepend(m, mtag); 295 } else 296 dt = (struct divert_tag *)(mtag+1); 297 298 /* Loopback avoidance and state recovery */ 299 if (sin) { 300 int i; 301 302 dt->cookie = sin->sin_port; 303 /* 304 * Find receive interface with the given name, stuffed 305 * (if it exists) in the sin_zero[] field. 306 * The name is user supplied data so don't trust its size 307 * or that it is zero terminated. 308 */ 309 for (i = 0; i < sizeof(sin->sin_zero) && sin->sin_zero[i]; i++) 310 ; 311 if ( i > 0 && i < sizeof(sin->sin_zero)) 312 m->m_pkthdr.rcvif = ifunit(sin->sin_zero); 313 } 314 315 /* Reinject packet into the system as incoming or outgoing */ 316 if (!sin || sin->sin_addr.s_addr == 0) { 317 struct ip *const ip = mtod(m, struct ip *); 318 struct inpcb *inp; 319 320 dt->info |= IP_FW_DIVERT_OUTPUT_FLAG; 321 INP_INFO_WLOCK(&divcbinfo); 322 inp = sotoinpcb(so); 323 INP_LOCK(inp); 324 /* 325 * Don't allow both user specified and setsockopt options, 326 * and don't allow packet length sizes that will crash 327 */ 328 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) || 329 ((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len)) { 330 error = EINVAL; 331 m_freem(m); 332 } else { 333 /* Convert fields to host order for ip_output() */ 334 ip->ip_len = ntohs(ip->ip_len); 335 ip->ip_off = ntohs(ip->ip_off); 336 337 /* Send packet to output processing */ 338 ipstat.ips_rawout++; /* XXX */ 339 340 #ifdef MAC 341 mac_create_mbuf_from_inpcb(inp, m); 342 #endif 343 error = ip_output(m, 344 inp->inp_options, NULL, 345 (so->so_options & SO_DONTROUTE) | 346 IP_ALLOWBROADCAST | IP_RAWOUTPUT, 347 inp->inp_moptions, NULL); 348 } 349 INP_UNLOCK(inp); 350 INP_INFO_WUNLOCK(&divcbinfo); 351 } else { 352 dt->info |= IP_FW_DIVERT_LOOPBACK_FLAG; 353 if (m->m_pkthdr.rcvif == NULL) { 354 /* 355 * No luck with the name, check by IP address. 356 * Clear the port and the ifname to make sure 357 * there are no distractions for ifa_ifwithaddr. 358 */ 359 struct ifaddr *ifa; 360 361 bzero(sin->sin_zero, sizeof(sin->sin_zero)); 362 sin->sin_port = 0; 363 ifa = ifa_ifwithaddr((struct sockaddr *) sin); 364 if (ifa == NULL) { 365 error = EADDRNOTAVAIL; 366 goto cantsend; 367 } 368 m->m_pkthdr.rcvif = ifa->ifa_ifp; 369 } 370 #ifdef MAC 371 SOCK_LOCK(so); 372 mac_create_mbuf_from_socket(so, m); 373 SOCK_UNLOCK(so); 374 #endif 375 /* Send packet to input processing */ 376 ip_input(m); 377 } 378 379 return error; 380 381 cantsend: 382 m_freem(m); 383 return error; 384 } 385 386 static int 387 div_attach(struct socket *so, int proto, struct thread *td) 388 { 389 struct inpcb *inp; 390 int error; 391 392 INP_INFO_WLOCK(&divcbinfo); 393 inp = sotoinpcb(so); 394 if (inp != 0) { 395 INP_INFO_WUNLOCK(&divcbinfo); 396 return EINVAL; 397 } 398 if (td && (error = suser(td)) != 0) { 399 INP_INFO_WUNLOCK(&divcbinfo); 400 return error; 401 } 402 error = soreserve(so, div_sendspace, div_recvspace); 403 if (error) { 404 INP_INFO_WUNLOCK(&divcbinfo); 405 return error; 406 } 407 error = in_pcballoc(so, &divcbinfo, "divinp"); 408 if (error) { 409 INP_INFO_WUNLOCK(&divcbinfo); 410 return error; 411 } 412 inp = (struct inpcb *)so->so_pcb; 413 INP_LOCK(inp); 414 INP_INFO_WUNLOCK(&divcbinfo); 415 inp->inp_ip_p = proto; 416 inp->inp_vflag |= INP_IPV4; 417 inp->inp_flags |= INP_HDRINCL; 418 INP_UNLOCK(inp); 419 return 0; 420 } 421 422 static int 423 div_detach(struct socket *so) 424 { 425 struct inpcb *inp; 426 427 INP_INFO_WLOCK(&divcbinfo); 428 inp = sotoinpcb(so); 429 if (inp == 0) { 430 INP_INFO_WUNLOCK(&divcbinfo); 431 return EINVAL; 432 } 433 INP_LOCK(inp); 434 in_pcbdetach(inp); 435 INP_INFO_WUNLOCK(&divcbinfo); 436 return 0; 437 } 438 439 static int 440 div_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 441 { 442 struct inpcb *inp; 443 int error; 444 445 INP_INFO_WLOCK(&divcbinfo); 446 inp = sotoinpcb(so); 447 if (inp == 0) { 448 INP_INFO_WUNLOCK(&divcbinfo); 449 return EINVAL; 450 } 451 /* in_pcbbind assumes that nam is a sockaddr_in 452 * and in_pcbbind requires a valid address. Since divert 453 * sockets don't we need to make sure the address is 454 * filled in properly. 455 * XXX -- divert should not be abusing in_pcbind 456 * and should probably have its own family. 457 */ 458 if (nam->sa_family != AF_INET) 459 error = EAFNOSUPPORT; 460 else { 461 ((struct sockaddr_in *)nam)->sin_addr.s_addr = INADDR_ANY; 462 INP_LOCK(inp); 463 error = in_pcbbind(inp, nam, td->td_ucred); 464 INP_UNLOCK(inp); 465 } 466 INP_INFO_WUNLOCK(&divcbinfo); 467 return error; 468 } 469 470 static int 471 div_shutdown(struct socket *so) 472 { 473 struct inpcb *inp; 474 475 INP_INFO_RLOCK(&divcbinfo); 476 inp = sotoinpcb(so); 477 if (inp == 0) { 478 INP_INFO_RUNLOCK(&divcbinfo); 479 return EINVAL; 480 } 481 INP_LOCK(inp); 482 INP_INFO_RUNLOCK(&divcbinfo); 483 socantsendmore(so); 484 INP_UNLOCK(inp); 485 return 0; 486 } 487 488 static int 489 div_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 490 struct mbuf *control, struct thread *td) 491 { 492 /* Packet must have a header (but that's about it) */ 493 if (m->m_len < sizeof (struct ip) && 494 (m = m_pullup(m, sizeof (struct ip))) == 0) { 495 ipstat.ips_toosmall++; 496 m_freem(m); 497 return EINVAL; 498 } 499 500 /* Send packet */ 501 return div_output(so, m, (struct sockaddr_in *)nam, control); 502 } 503 504 void 505 div_ctlinput(int cmd, struct sockaddr *sa, void *vip) 506 { 507 struct in_addr faddr; 508 509 faddr = ((struct sockaddr_in *)sa)->sin_addr; 510 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 511 return; 512 if (PRC_IS_REDIRECT(cmd)) 513 return; 514 } 515 516 static int 517 div_pcblist(SYSCTL_HANDLER_ARGS) 518 { 519 int error, i, n; 520 struct inpcb *inp, **inp_list; 521 inp_gen_t gencnt; 522 struct xinpgen xig; 523 524 /* 525 * The process of preparing the TCB list is too time-consuming and 526 * resource-intensive to repeat twice on every request. 527 */ 528 if (req->oldptr == 0) { 529 n = divcbinfo.ipi_count; 530 req->oldidx = 2 * (sizeof xig) 531 + (n + n/8) * sizeof(struct xinpcb); 532 return 0; 533 } 534 535 if (req->newptr != 0) 536 return EPERM; 537 538 /* 539 * OK, now we're committed to doing something. 540 */ 541 INP_INFO_RLOCK(&divcbinfo); 542 gencnt = divcbinfo.ipi_gencnt; 543 n = divcbinfo.ipi_count; 544 INP_INFO_RUNLOCK(&divcbinfo); 545 546 error = sysctl_wire_old_buffer(req, 547 2 * sizeof(xig) + n*sizeof(struct xinpcb)); 548 if (error != 0) 549 return (error); 550 551 xig.xig_len = sizeof xig; 552 xig.xig_count = n; 553 xig.xig_gen = gencnt; 554 xig.xig_sogen = so_gencnt; 555 error = SYSCTL_OUT(req, &xig, sizeof xig); 556 if (error) 557 return error; 558 559 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 560 if (inp_list == 0) 561 return ENOMEM; 562 563 INP_INFO_RLOCK(&divcbinfo); 564 for (inp = LIST_FIRST(divcbinfo.listhead), i = 0; inp && i < n; 565 inp = LIST_NEXT(inp, inp_list)) { 566 INP_LOCK(inp); 567 if (inp->inp_gencnt <= gencnt && 568 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) 569 inp_list[i++] = inp; 570 INP_UNLOCK(inp); 571 } 572 INP_INFO_RUNLOCK(&divcbinfo); 573 n = i; 574 575 error = 0; 576 for (i = 0; i < n; i++) { 577 inp = inp_list[i]; 578 if (inp->inp_gencnt <= gencnt) { 579 struct xinpcb xi; 580 bzero(&xi, sizeof(xi)); 581 xi.xi_len = sizeof xi; 582 /* XXX should avoid extra copy */ 583 bcopy(inp, &xi.xi_inp, sizeof *inp); 584 if (inp->inp_socket) 585 sotoxsocket(inp->inp_socket, &xi.xi_socket); 586 error = SYSCTL_OUT(req, &xi, sizeof xi); 587 } 588 } 589 if (!error) { 590 /* 591 * Give the user an updated idea of our state. 592 * If the generation differs from what we told 593 * her before, she knows that something happened 594 * while we were processing this request, and it 595 * might be necessary to retry. 596 */ 597 INP_INFO_RLOCK(&divcbinfo); 598 xig.xig_gen = divcbinfo.ipi_gencnt; 599 xig.xig_sogen = so_gencnt; 600 xig.xig_count = divcbinfo.ipi_count; 601 INP_INFO_RUNLOCK(&divcbinfo); 602 error = SYSCTL_OUT(req, &xig, sizeof xig); 603 } 604 free(inp_list, M_TEMP); 605 return error; 606 } 607 608 /* 609 * This is the wrapper function for in_setsockaddr. We just pass down 610 * the pcbinfo for in_setpeeraddr to lock. 611 */ 612 static int 613 div_sockaddr(struct socket *so, struct sockaddr **nam) 614 { 615 return (in_setsockaddr(so, nam, &divcbinfo)); 616 } 617 618 /* 619 * This is the wrapper function for in_setpeeraddr. We just pass down 620 * the pcbinfo for in_setpeeraddr to lock. 621 */ 622 static int 623 div_peeraddr(struct socket *so, struct sockaddr **nam) 624 { 625 return (in_setpeeraddr(so, nam, &divcbinfo)); 626 } 627 628 629 SYSCTL_DECL(_net_inet_divert); 630 SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLFLAG_RD, 0, 0, 631 div_pcblist, "S,xinpcb", "List of active divert sockets"); 632 633 struct pr_usrreqs div_usrreqs = { 634 NULL, pru_accept_notsupp, div_attach, div_bind, 635 pru_connect_notsupp, pru_connect2_notsupp, in_control, div_detach, 636 NULL, pru_listen_notsupp, div_peeraddr, pru_rcvd_notsupp, 637 pru_rcvoob_notsupp, div_send, pru_sense_null, div_shutdown, 638 div_sockaddr, sosend, soreceive, sopoll, in_pcbsosetlabel 639 };
Cache object: 742292622a2317f97dec958cff52d258
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