Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet/udp_usrreq.c
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1 /*- 2 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 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 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 30 * $FreeBSD$ 31 */ 32 33 #include "opt_ipsec.h" 34 #include "opt_inet6.h" 35 #include "opt_mac.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/domain.h> 40 #include <sys/jail.h> 41 #include <sys/kernel.h> 42 #include <sys/lock.h> 43 #include <sys/mac.h> 44 #include <sys/malloc.h> 45 #include <sys/mbuf.h> 46 #include <sys/proc.h> 47 #include <sys/protosw.h> 48 #include <sys/signalvar.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/sx.h> 52 #include <sys/sysctl.h> 53 #include <sys/syslog.h> 54 55 #include <vm/uma.h> 56 57 #include <net/if.h> 58 #include <net/route.h> 59 60 #include <netinet/in.h> 61 #include <netinet/in_systm.h> 62 #include <netinet/in_pcb.h> 63 #include <netinet/in_var.h> 64 #include <netinet/ip.h> 65 #ifdef INET6 66 #include <netinet/ip6.h> 67 #endif 68 #include <netinet/ip_icmp.h> 69 #include <netinet/icmp_var.h> 70 #include <netinet/ip_var.h> 71 #ifdef INET6 72 #include <netinet6/ip6_var.h> 73 #endif 74 #include <netinet/udp.h> 75 #include <netinet/udp_var.h> 76 77 #ifdef FAST_IPSEC 78 #include <netipsec/ipsec.h> 79 #endif /*FAST_IPSEC*/ 80 81 #ifdef IPSEC 82 #include <netinet6/ipsec.h> 83 #endif /*IPSEC*/ 84 85 #include <machine/in_cksum.h> 86 87 /* 88 * UDP protocol implementation. 89 * Per RFC 768, August, 1980. 90 */ 91 #ifndef COMPAT_42 92 static int udpcksum = 1; 93 #else 94 static int udpcksum = 0; /* XXX */ 95 #endif 96 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, 97 &udpcksum, 0, ""); 98 99 int log_in_vain = 0; 100 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 101 &log_in_vain, 0, "Log all incoming UDP packets"); 102 103 static int blackhole = 0; 104 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, 105 &blackhole, 0, "Do not send port unreachables for refused connects"); 106 107 static int strict_mcast_mship = 0; 108 SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW, 109 &strict_mcast_mship, 0, "Only send multicast to member sockets"); 110 111 struct inpcbhead udb; /* from udp_var.h */ 112 #define udb6 udb /* for KAME src sync over BSD*'s */ 113 struct inpcbinfo udbinfo; 114 115 #ifndef UDBHASHSIZE 116 #define UDBHASHSIZE 16 117 #endif 118 119 struct udpstat udpstat; /* from udp_var.h */ 120 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW, 121 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); 122 123 static void udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, 124 int off, struct sockaddr_in *udp_in); 125 126 static int udp_detach(struct socket *so); 127 static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *, 128 struct mbuf *, struct thread *); 129 130 void 131 udp_init() 132 { 133 INP_INFO_LOCK_INIT(&udbinfo, "udp"); 134 LIST_INIT(&udb); 135 udbinfo.listhead = &udb; 136 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask); 137 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB, 138 &udbinfo.porthashmask); 139 udbinfo.ipi_zone = uma_zcreate("udpcb", sizeof(struct inpcb), NULL, 140 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 141 uma_zone_set_max(udbinfo.ipi_zone, maxsockets); 142 } 143 144 void 145 udp_input(m, off) 146 register struct mbuf *m; 147 int off; 148 { 149 int iphlen = off; 150 register struct ip *ip; 151 register struct udphdr *uh; 152 register struct inpcb *inp; 153 struct mbuf *opts = 0; 154 int len; 155 struct ip save_ip; 156 struct sockaddr_in udp_in; 157 158 udpstat.udps_ipackets++; 159 160 /* 161 * Strip IP options, if any; should skip this, 162 * make available to user, and use on returned packets, 163 * but we don't yet have a way to check the checksum 164 * with options still present. 165 */ 166 if (iphlen > sizeof (struct ip)) { 167 ip_stripoptions(m, (struct mbuf *)0); 168 iphlen = sizeof(struct ip); 169 } 170 171 /* 172 * Get IP and UDP header together in first mbuf. 173 */ 174 ip = mtod(m, struct ip *); 175 if (m->m_len < iphlen + sizeof(struct udphdr)) { 176 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { 177 udpstat.udps_hdrops++; 178 return; 179 } 180 ip = mtod(m, struct ip *); 181 } 182 uh = (struct udphdr *)((caddr_t)ip + iphlen); 183 184 /* destination port of 0 is illegal, based on RFC768. */ 185 if (uh->uh_dport == 0) 186 goto badunlocked; 187 188 /* 189 * Construct sockaddr format source address. 190 * Stuff source address and datagram in user buffer. 191 */ 192 bzero(&udp_in, sizeof(udp_in)); 193 udp_in.sin_len = sizeof(udp_in); 194 udp_in.sin_family = AF_INET; 195 udp_in.sin_port = uh->uh_sport; 196 udp_in.sin_addr = ip->ip_src; 197 198 /* 199 * Make mbuf data length reflect UDP length. 200 * If not enough data to reflect UDP length, drop. 201 */ 202 len = ntohs((u_short)uh->uh_ulen); 203 if (ip->ip_len != len) { 204 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 205 udpstat.udps_badlen++; 206 goto badunlocked; 207 } 208 m_adj(m, len - ip->ip_len); 209 /* ip->ip_len = len; */ 210 } 211 /* 212 * Save a copy of the IP header in case we want restore it 213 * for sending an ICMP error message in response. 214 */ 215 if (!blackhole) 216 save_ip = *ip; 217 218 /* 219 * Checksum extended UDP header and data. 220 */ 221 if (uh->uh_sum) { 222 u_short uh_sum; 223 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 224 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 225 uh_sum = m->m_pkthdr.csum_data; 226 else 227 uh_sum = in_pseudo(ip->ip_src.s_addr, 228 ip->ip_dst.s_addr, htonl((u_short)len + 229 m->m_pkthdr.csum_data + IPPROTO_UDP)); 230 uh_sum ^= 0xffff; 231 } else { 232 char b[9]; 233 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 234 bzero(((struct ipovly *)ip)->ih_x1, 9); 235 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 236 uh_sum = in_cksum(m, len + sizeof (struct ip)); 237 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 238 } 239 if (uh_sum) { 240 udpstat.udps_badsum++; 241 m_freem(m); 242 return; 243 } 244 } else 245 udpstat.udps_nosum++; 246 247 INP_INFO_RLOCK(&udbinfo); 248 249 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 250 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { 251 struct inpcb *last; 252 /* 253 * Deliver a multicast or broadcast datagram to *all* sockets 254 * for which the local and remote addresses and ports match 255 * those of the incoming datagram. This allows more than 256 * one process to receive multi/broadcasts on the same port. 257 * (This really ought to be done for unicast datagrams as 258 * well, but that would cause problems with existing 259 * applications that open both address-specific sockets and 260 * a wildcard socket listening to the same port -- they would 261 * end up receiving duplicates of every unicast datagram. 262 * Those applications open the multiple sockets to overcome an 263 * inadequacy of the UDP socket interface, but for backwards 264 * compatibility we avoid the problem here rather than 265 * fixing the interface. Maybe 4.5BSD will remedy this?) 266 */ 267 268 /* 269 * Locate pcb(s) for datagram. 270 * (Algorithm copied from raw_intr().) 271 */ 272 last = NULL; 273 LIST_FOREACH(inp, &udb, inp_list) { 274 if (inp->inp_lport != uh->uh_dport) 275 continue; 276 #ifdef INET6 277 if ((inp->inp_vflag & INP_IPV4) == 0) 278 continue; 279 #endif 280 if (inp->inp_laddr.s_addr != INADDR_ANY) { 281 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 282 continue; 283 } 284 if (inp->inp_faddr.s_addr != INADDR_ANY) { 285 if (inp->inp_faddr.s_addr != 286 ip->ip_src.s_addr || 287 inp->inp_fport != uh->uh_sport) 288 continue; 289 } 290 INP_LOCK(inp); 291 292 /* 293 * Check multicast packets to make sure they are only 294 * sent to sockets with multicast memberships for the 295 * packet's destination address and arrival interface 296 */ 297 #define MSHIP(_inp, n) ((_inp)->inp_moptions->imo_membership[(n)]) 298 #define NMSHIPS(_inp) ((_inp)->inp_moptions->imo_num_memberships) 299 if (strict_mcast_mship && inp->inp_moptions != NULL) { 300 int mship, foundmship = 0; 301 302 for (mship = 0; mship < NMSHIPS(inp); mship++) { 303 if (MSHIP(inp, mship)->inm_addr.s_addr 304 == ip->ip_dst.s_addr && 305 MSHIP(inp, mship)->inm_ifp 306 == m->m_pkthdr.rcvif) { 307 foundmship = 1; 308 break; 309 } 310 } 311 if (foundmship == 0) { 312 INP_UNLOCK(inp); 313 continue; 314 } 315 } 316 #undef NMSHIPS 317 #undef MSHIP 318 if (last != NULL) { 319 struct mbuf *n; 320 321 n = m_copy(m, 0, M_COPYALL); 322 if (n != NULL) 323 udp_append(last, ip, n, 324 iphlen + 325 sizeof(struct udphdr), 326 &udp_in); 327 INP_UNLOCK(last); 328 } 329 last = inp; 330 /* 331 * Don't look for additional matches if this one does 332 * not have either the SO_REUSEPORT or SO_REUSEADDR 333 * socket options set. This heuristic avoids searching 334 * through all pcbs in the common case of a non-shared 335 * port. It * assumes that an application will never 336 * clear these options after setting them. 337 */ 338 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0) 339 break; 340 } 341 342 if (last == NULL) { 343 /* 344 * No matching pcb found; discard datagram. 345 * (No need to send an ICMP Port Unreachable 346 * for a broadcast or multicast datgram.) 347 */ 348 udpstat.udps_noportbcast++; 349 goto badheadlocked; 350 } 351 udp_append(last, ip, m, iphlen + sizeof(struct udphdr), 352 &udp_in); 353 INP_UNLOCK(last); 354 INP_INFO_RUNLOCK(&udbinfo); 355 return; 356 } 357 /* 358 * Locate pcb for datagram. 359 */ 360 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, 361 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 362 if (inp == NULL) { 363 if (log_in_vain) { 364 char buf[4*sizeof "123"]; 365 366 strcpy(buf, inet_ntoa(ip->ip_dst)); 367 log(LOG_INFO, 368 "Connection attempt to UDP %s:%d from %s:%d\n", 369 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 370 ntohs(uh->uh_sport)); 371 } 372 udpstat.udps_noport++; 373 if (m->m_flags & (M_BCAST | M_MCAST)) { 374 udpstat.udps_noportbcast++; 375 goto badheadlocked; 376 } 377 if (blackhole) 378 goto badheadlocked; 379 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 380 goto badheadlocked; 381 *ip = save_ip; 382 ip->ip_len += iphlen; 383 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 384 INP_INFO_RUNLOCK(&udbinfo); 385 return; 386 } 387 INP_LOCK(inp); 388 udp_append(inp, ip, m, iphlen + sizeof(struct udphdr), &udp_in); 389 INP_UNLOCK(inp); 390 INP_INFO_RUNLOCK(&udbinfo); 391 return; 392 393 badheadlocked: 394 if (inp) 395 INP_UNLOCK(inp); 396 INP_INFO_RUNLOCK(&udbinfo); 397 badunlocked: 398 m_freem(m); 399 if (opts) 400 m_freem(opts); 401 return; 402 } 403 404 /* 405 * Subroutine of udp_input(), which appends the provided mbuf chain to the 406 * passed pcb/socket. The caller must provide a sockaddr_in via udp_in that 407 * contains the source address. If the socket ends up being an IPv6 socket, 408 * udp_append() will convert to a sockaddr_in6 before passing the address 409 * into the socket code. 410 */ 411 static void 412 udp_append(last, ip, n, off, udp_in) 413 struct inpcb *last; 414 struct ip *ip; 415 struct mbuf *n; 416 int off; 417 struct sockaddr_in *udp_in; 418 { 419 struct sockaddr *append_sa; 420 struct socket *so; 421 struct mbuf *opts = 0; 422 #ifdef INET6 423 struct sockaddr_in6 udp_in6; 424 #endif 425 426 INP_LOCK_ASSERT(last); 427 428 #if defined(IPSEC) || defined(FAST_IPSEC) 429 /* check AH/ESP integrity. */ 430 if (ipsec4_in_reject(n, last)) { 431 #ifdef IPSEC 432 ipsecstat.in_polvio++; 433 #endif /*IPSEC*/ 434 m_freem(n); 435 return; 436 } 437 #endif /*IPSEC || FAST_IPSEC*/ 438 #ifdef MAC 439 if (mac_check_inpcb_deliver(last, n) != 0) { 440 m_freem(n); 441 return; 442 } 443 #endif 444 if (last->inp_flags & INP_CONTROLOPTS || 445 last->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) { 446 #ifdef INET6 447 if (last->inp_vflag & INP_IPV6) { 448 int savedflags; 449 450 savedflags = last->inp_flags; 451 last->inp_flags &= ~INP_UNMAPPABLEOPTS; 452 ip6_savecontrol(last, n, &opts); 453 last->inp_flags = savedflags; 454 } else 455 #endif 456 ip_savecontrol(last, &opts, ip, n); 457 } 458 #ifdef INET6 459 if (last->inp_vflag & INP_IPV6) { 460 bzero(&udp_in6, sizeof(udp_in6)); 461 udp_in6.sin6_len = sizeof(udp_in6); 462 udp_in6.sin6_family = AF_INET6; 463 in6_sin_2_v4mapsin6(udp_in, &udp_in6); 464 append_sa = (struct sockaddr *)&udp_in6; 465 } else 466 #endif 467 append_sa = (struct sockaddr *)udp_in; 468 m_adj(n, off); 469 470 so = last->inp_socket; 471 SOCKBUF_LOCK(&so->so_rcv); 472 if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) { 473 m_freem(n); 474 if (opts) 475 m_freem(opts); 476 udpstat.udps_fullsock++; 477 SOCKBUF_UNLOCK(&so->so_rcv); 478 } else 479 sorwakeup_locked(so); 480 } 481 482 /* 483 * Notify a udp user of an asynchronous error; 484 * just wake up so that he can collect error status. 485 */ 486 struct inpcb * 487 udp_notify(inp, errno) 488 register struct inpcb *inp; 489 int errno; 490 { 491 inp->inp_socket->so_error = errno; 492 sorwakeup(inp->inp_socket); 493 sowwakeup(inp->inp_socket); 494 return inp; 495 } 496 497 void 498 udp_ctlinput(cmd, sa, vip) 499 int cmd; 500 struct sockaddr *sa; 501 void *vip; 502 { 503 struct ip *ip = vip; 504 struct udphdr *uh; 505 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 506 struct in_addr faddr; 507 struct inpcb *inp; 508 509 faddr = ((struct sockaddr_in *)sa)->sin_addr; 510 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 511 return; 512 513 /* 514 * Redirects don't need to be handled up here. 515 */ 516 if (PRC_IS_REDIRECT(cmd)) 517 return; 518 /* 519 * Hostdead is ugly because it goes linearly through all PCBs. 520 * XXX: We never get this from ICMP, otherwise it makes an 521 * excellent DoS attack on machines with many connections. 522 */ 523 if (cmd == PRC_HOSTDEAD) 524 ip = 0; 525 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 526 return; 527 if (ip) { 528 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 529 INP_INFO_RLOCK(&udbinfo); 530 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport, 531 ip->ip_src, uh->uh_sport, 0, NULL); 532 if (inp != NULL) { 533 INP_LOCK(inp); 534 if (inp->inp_socket != NULL) { 535 (*notify)(inp, inetctlerrmap[cmd]); 536 } 537 INP_UNLOCK(inp); 538 } 539 INP_INFO_RUNLOCK(&udbinfo); 540 } else 541 in_pcbnotifyall(&udbinfo, faddr, inetctlerrmap[cmd], notify); 542 } 543 544 static int 545 udp_pcblist(SYSCTL_HANDLER_ARGS) 546 { 547 int error, i, n; 548 struct inpcb *inp, **inp_list; 549 inp_gen_t gencnt; 550 struct xinpgen xig; 551 552 /* 553 * The process of preparing the TCB list is too time-consuming and 554 * resource-intensive to repeat twice on every request. 555 */ 556 if (req->oldptr == 0) { 557 n = udbinfo.ipi_count; 558 req->oldidx = 2 * (sizeof xig) 559 + (n + n/8) * sizeof(struct xinpcb); 560 return 0; 561 } 562 563 if (req->newptr != 0) 564 return EPERM; 565 566 /* 567 * OK, now we're committed to doing something. 568 */ 569 INP_INFO_RLOCK(&udbinfo); 570 gencnt = udbinfo.ipi_gencnt; 571 n = udbinfo.ipi_count; 572 INP_INFO_RUNLOCK(&udbinfo); 573 574 error = sysctl_wire_old_buffer(req, 2 * (sizeof xig) 575 + n * sizeof(struct xinpcb)); 576 if (error != 0) 577 return (error); 578 579 xig.xig_len = sizeof xig; 580 xig.xig_count = n; 581 xig.xig_gen = gencnt; 582 xig.xig_sogen = so_gencnt; 583 error = SYSCTL_OUT(req, &xig, sizeof xig); 584 if (error) 585 return error; 586 587 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 588 if (inp_list == 0) 589 return ENOMEM; 590 591 INP_INFO_RLOCK(&udbinfo); 592 for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n; 593 inp = LIST_NEXT(inp, inp_list)) { 594 INP_LOCK(inp); 595 if (inp->inp_gencnt <= gencnt && 596 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) 597 inp_list[i++] = inp; 598 INP_UNLOCK(inp); 599 } 600 INP_INFO_RUNLOCK(&udbinfo); 601 n = i; 602 603 error = 0; 604 for (i = 0; i < n; i++) { 605 inp = inp_list[i]; 606 if (inp->inp_gencnt <= gencnt) { 607 struct xinpcb xi; 608 bzero(&xi, sizeof(xi)); 609 xi.xi_len = sizeof xi; 610 /* XXX should avoid extra copy */ 611 bcopy(inp, &xi.xi_inp, sizeof *inp); 612 if (inp->inp_socket) 613 sotoxsocket(inp->inp_socket, &xi.xi_socket); 614 xi.xi_inp.inp_gencnt = inp->inp_gencnt; 615 error = SYSCTL_OUT(req, &xi, sizeof xi); 616 } 617 } 618 if (!error) { 619 /* 620 * Give the user an updated idea of our state. 621 * If the generation differs from what we told 622 * her before, she knows that something happened 623 * while we were processing this request, and it 624 * might be necessary to retry. 625 */ 626 INP_INFO_RLOCK(&udbinfo); 627 xig.xig_gen = udbinfo.ipi_gencnt; 628 xig.xig_sogen = so_gencnt; 629 xig.xig_count = udbinfo.ipi_count; 630 INP_INFO_RUNLOCK(&udbinfo); 631 error = SYSCTL_OUT(req, &xig, sizeof xig); 632 } 633 free(inp_list, M_TEMP); 634 return error; 635 } 636 637 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 638 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 639 640 static int 641 udp_getcred(SYSCTL_HANDLER_ARGS) 642 { 643 struct xucred xuc; 644 struct sockaddr_in addrs[2]; 645 struct inpcb *inp; 646 int error; 647 648 error = suser_cred(req->td->td_ucred, SUSER_ALLOWJAIL); 649 if (error) 650 return (error); 651 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 652 if (error) 653 return (error); 654 INP_INFO_RLOCK(&udbinfo); 655 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 656 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 657 if (inp == NULL || inp->inp_socket == NULL) { 658 error = ENOENT; 659 goto out; 660 } 661 error = cr_canseesocket(req->td->td_ucred, inp->inp_socket); 662 if (error) 663 goto out; 664 cru2x(inp->inp_socket->so_cred, &xuc); 665 out: 666 INP_INFO_RUNLOCK(&udbinfo); 667 if (error == 0) 668 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 669 return (error); 670 } 671 672 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, 673 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, 674 udp_getcred, "S,xucred", "Get the xucred of a UDP connection"); 675 676 static int 677 udp_output(inp, m, addr, control, td) 678 register struct inpcb *inp; 679 struct mbuf *m; 680 struct sockaddr *addr; 681 struct mbuf *control; 682 struct thread *td; 683 { 684 register struct udpiphdr *ui; 685 register int len = m->m_pkthdr.len; 686 struct in_addr faddr, laddr; 687 struct cmsghdr *cm; 688 struct sockaddr_in *sin, src; 689 int error = 0; 690 int ipflags; 691 u_short fport, lport; 692 int unlock_udbinfo; 693 694 /* 695 * udp_output() may need to temporarily bind or connect the current 696 * inpcb. As such, we don't know up front what inpcb locks we will 697 * need. Do any work to decide what is needed up front before 698 * acquiring locks. 699 */ 700 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 701 if (control) 702 m_freem(control); 703 m_freem(m); 704 return EMSGSIZE; 705 } 706 707 src.sin_addr.s_addr = INADDR_ANY; 708 if (control != NULL) { 709 /* 710 * XXX: Currently, we assume all the optional information 711 * is stored in a single mbuf. 712 */ 713 if (control->m_next) { 714 m_freem(control); 715 m_freem(m); 716 return EINVAL; 717 } 718 for (; control->m_len > 0; 719 control->m_data += CMSG_ALIGN(cm->cmsg_len), 720 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 721 cm = mtod(control, struct cmsghdr *); 722 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0 || 723 cm->cmsg_len > control->m_len) { 724 error = EINVAL; 725 break; 726 } 727 if (cm->cmsg_level != IPPROTO_IP) 728 continue; 729 730 switch (cm->cmsg_type) { 731 case IP_SENDSRCADDR: 732 if (cm->cmsg_len != 733 CMSG_LEN(sizeof(struct in_addr))) { 734 error = EINVAL; 735 break; 736 } 737 bzero(&src, sizeof(src)); 738 src.sin_family = AF_INET; 739 src.sin_len = sizeof(src); 740 src.sin_port = inp->inp_lport; 741 src.sin_addr = *(struct in_addr *)CMSG_DATA(cm); 742 break; 743 default: 744 error = ENOPROTOOPT; 745 break; 746 } 747 if (error) 748 break; 749 } 750 m_freem(control); 751 } 752 if (error) { 753 m_freem(m); 754 return error; 755 } 756 757 if (src.sin_addr.s_addr != INADDR_ANY || 758 addr != NULL) { 759 INP_INFO_WLOCK(&udbinfo); 760 unlock_udbinfo = 1; 761 } else 762 unlock_udbinfo = 0; 763 INP_LOCK(inp); 764 765 #ifdef MAC 766 mac_create_mbuf_from_inpcb(inp, m); 767 #endif 768 769 laddr = inp->inp_laddr; 770 lport = inp->inp_lport; 771 if (src.sin_addr.s_addr != INADDR_ANY) { 772 if (lport == 0) { 773 error = EINVAL; 774 goto release; 775 } 776 error = in_pcbbind_setup(inp, (struct sockaddr *)&src, 777 &laddr.s_addr, &lport, td->td_ucred); 778 if (error) 779 goto release; 780 } 781 782 if (addr) { 783 sin = (struct sockaddr_in *)addr; 784 if (td && jailed(td->td_ucred)) 785 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr); 786 if (inp->inp_faddr.s_addr != INADDR_ANY) { 787 error = EISCONN; 788 goto release; 789 } 790 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, &lport, 791 &faddr.s_addr, &fport, NULL, td->td_ucred); 792 if (error) 793 goto release; 794 795 /* Commit the local port if newly assigned. */ 796 if (inp->inp_laddr.s_addr == INADDR_ANY && 797 inp->inp_lport == 0) { 798 /* 799 * Remember addr if jailed, to prevent rebinding. 800 */ 801 if (jailed(td->td_ucred)) 802 inp->inp_laddr = laddr; 803 inp->inp_lport = lport; 804 if (in_pcbinshash(inp) != 0) { 805 inp->inp_lport = 0; 806 error = EAGAIN; 807 goto release; 808 } 809 inp->inp_flags |= INP_ANONPORT; 810 } 811 } else { 812 faddr = inp->inp_faddr; 813 fport = inp->inp_fport; 814 if (faddr.s_addr == INADDR_ANY) { 815 error = ENOTCONN; 816 goto release; 817 } 818 } 819 820 /* 821 * Calculate data length and get a mbuf for UDP, IP, and possible 822 * link-layer headers. Immediate slide the data pointer back forward 823 * since we won't use that space at this layer. 824 */ 825 M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_DONTWAIT); 826 if (m == NULL) { 827 error = ENOBUFS; 828 goto release; 829 } 830 m->m_data += max_linkhdr; 831 m->m_len -= max_linkhdr; 832 m->m_pkthdr.len -= max_linkhdr; 833 834 /* 835 * Fill in mbuf with extended UDP header 836 * and addresses and length put into network format. 837 */ 838 ui = mtod(m, struct udpiphdr *); 839 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ 840 ui->ui_pr = IPPROTO_UDP; 841 ui->ui_src = laddr; 842 ui->ui_dst = faddr; 843 ui->ui_sport = lport; 844 ui->ui_dport = fport; 845 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 846 847 ipflags = inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST); 848 if (inp->inp_flags & INP_ONESBCAST) 849 ipflags |= IP_SENDONES; 850 851 /* 852 * Set up checksum and output datagram. 853 */ 854 if (udpcksum) { 855 if (inp->inp_flags & INP_ONESBCAST) 856 faddr.s_addr = INADDR_BROADCAST; 857 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr, 858 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 859 m->m_pkthdr.csum_flags = CSUM_UDP; 860 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 861 } else { 862 ui->ui_sum = 0; 863 } 864 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 865 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 866 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 867 udpstat.udps_opackets++; 868 869 if (unlock_udbinfo) 870 INP_INFO_WUNLOCK(&udbinfo); 871 error = ip_output(m, inp->inp_options, NULL, ipflags, 872 inp->inp_moptions, inp); 873 INP_UNLOCK(inp); 874 return (error); 875 876 release: 877 INP_UNLOCK(inp); 878 if (unlock_udbinfo) 879 INP_INFO_WUNLOCK(&udbinfo); 880 m_freem(m); 881 return (error); 882 } 883 884 u_long udp_sendspace = 9216; /* really max datagram size */ 885 /* 40 1K datagrams */ 886 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 887 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 888 889 u_long udp_recvspace = 40 * (1024 + 890 #ifdef INET6 891 sizeof(struct sockaddr_in6) 892 #else 893 sizeof(struct sockaddr_in) 894 #endif 895 ); 896 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 897 &udp_recvspace, 0, "Maximum space for incoming UDP datagrams"); 898 899 static int 900 udp_abort(struct socket *so) 901 { 902 struct inpcb *inp; 903 904 INP_INFO_WLOCK(&udbinfo); 905 inp = sotoinpcb(so); 906 if (inp == 0) { 907 INP_INFO_WUNLOCK(&udbinfo); 908 return EINVAL; /* ??? possible? panic instead? */ 909 } 910 INP_LOCK(inp); 911 soisdisconnected(so); 912 in_pcbdetach(inp); 913 INP_INFO_WUNLOCK(&udbinfo); 914 return 0; 915 } 916 917 static int 918 udp_attach(struct socket *so, int proto, struct thread *td) 919 { 920 struct inpcb *inp; 921 int error; 922 923 INP_INFO_WLOCK(&udbinfo); 924 inp = sotoinpcb(so); 925 if (inp != 0) { 926 INP_INFO_WUNLOCK(&udbinfo); 927 return EINVAL; 928 } 929 error = soreserve(so, udp_sendspace, udp_recvspace); 930 if (error) { 931 INP_INFO_WUNLOCK(&udbinfo); 932 return error; 933 } 934 error = in_pcballoc(so, &udbinfo, "udpinp"); 935 if (error) { 936 INP_INFO_WUNLOCK(&udbinfo); 937 return error; 938 } 939 940 inp = (struct inpcb *)so->so_pcb; 941 INP_LOCK(inp); 942 INP_INFO_WUNLOCK(&udbinfo); 943 inp->inp_vflag |= INP_IPV4; 944 inp->inp_ip_ttl = ip_defttl; 945 INP_UNLOCK(inp); 946 return 0; 947 } 948 949 static int 950 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 951 { 952 struct inpcb *inp; 953 int error; 954 955 INP_INFO_WLOCK(&udbinfo); 956 inp = sotoinpcb(so); 957 if (inp == 0) { 958 INP_INFO_WUNLOCK(&udbinfo); 959 return EINVAL; 960 } 961 INP_LOCK(inp); 962 error = in_pcbbind(inp, nam, td->td_ucred); 963 INP_UNLOCK(inp); 964 INP_INFO_WUNLOCK(&udbinfo); 965 return error; 966 } 967 968 static int 969 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 970 { 971 struct inpcb *inp; 972 int error; 973 struct sockaddr_in *sin; 974 975 INP_INFO_WLOCK(&udbinfo); 976 inp = sotoinpcb(so); 977 if (inp == 0) { 978 INP_INFO_WUNLOCK(&udbinfo); 979 return EINVAL; 980 } 981 INP_LOCK(inp); 982 if (inp->inp_faddr.s_addr != INADDR_ANY) { 983 INP_UNLOCK(inp); 984 INP_INFO_WUNLOCK(&udbinfo); 985 return EISCONN; 986 } 987 sin = (struct sockaddr_in *)nam; 988 if (td && jailed(td->td_ucred)) 989 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr); 990 error = in_pcbconnect(inp, nam, td->td_ucred); 991 if (error == 0) 992 soisconnected(so); 993 INP_UNLOCK(inp); 994 INP_INFO_WUNLOCK(&udbinfo); 995 return error; 996 } 997 998 static int 999 udp_detach(struct socket *so) 1000 { 1001 struct inpcb *inp; 1002 1003 INP_INFO_WLOCK(&udbinfo); 1004 inp = sotoinpcb(so); 1005 if (inp == 0) { 1006 INP_INFO_WUNLOCK(&udbinfo); 1007 return EINVAL; 1008 } 1009 INP_LOCK(inp); 1010 in_pcbdetach(inp); 1011 INP_INFO_WUNLOCK(&udbinfo); 1012 return 0; 1013 } 1014 1015 static int 1016 udp_disconnect(struct socket *so) 1017 { 1018 struct inpcb *inp; 1019 1020 INP_INFO_WLOCK(&udbinfo); 1021 inp = sotoinpcb(so); 1022 if (inp == 0) { 1023 INP_INFO_WUNLOCK(&udbinfo); 1024 return EINVAL; 1025 } 1026 INP_LOCK(inp); 1027 if (inp->inp_faddr.s_addr == INADDR_ANY) { 1028 INP_INFO_WUNLOCK(&udbinfo); 1029 INP_UNLOCK(inp); 1030 return ENOTCONN; 1031 } 1032 1033 in_pcbdisconnect(inp); 1034 inp->inp_laddr.s_addr = INADDR_ANY; 1035 INP_UNLOCK(inp); 1036 INP_INFO_WUNLOCK(&udbinfo); 1037 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1038 return 0; 1039 } 1040 1041 static int 1042 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 1043 struct mbuf *control, struct thread *td) 1044 { 1045 struct inpcb *inp; 1046 1047 inp = sotoinpcb(so); 1048 return udp_output(inp, m, addr, control, td); 1049 } 1050 1051 int 1052 udp_shutdown(struct socket *so) 1053 { 1054 struct inpcb *inp; 1055 1056 INP_INFO_RLOCK(&udbinfo); 1057 inp = sotoinpcb(so); 1058 if (inp == 0) { 1059 INP_INFO_RUNLOCK(&udbinfo); 1060 return EINVAL; 1061 } 1062 INP_LOCK(inp); 1063 INP_INFO_RUNLOCK(&udbinfo); 1064 socantsendmore(so); 1065 INP_UNLOCK(inp); 1066 return 0; 1067 } 1068 1069 /* 1070 * This is the wrapper function for in_setsockaddr. We just pass down 1071 * the pcbinfo for in_setsockaddr to lock. We don't want to do the locking 1072 * here because in_setsockaddr will call malloc and might block. 1073 */ 1074 static int 1075 udp_sockaddr(struct socket *so, struct sockaddr **nam) 1076 { 1077 return (in_setsockaddr(so, nam, &udbinfo)); 1078 } 1079 1080 /* 1081 * This is the wrapper function for in_setpeeraddr. We just pass down 1082 * the pcbinfo for in_setpeeraddr to lock. 1083 */ 1084 static int 1085 udp_peeraddr(struct socket *so, struct sockaddr **nam) 1086 { 1087 return (in_setpeeraddr(so, nam, &udbinfo)); 1088 } 1089 1090 struct pr_usrreqs udp_usrreqs = { 1091 udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect, 1092 pru_connect2_notsupp, in_control, udp_detach, udp_disconnect, 1093 pru_listen_notsupp, udp_peeraddr, pru_rcvd_notsupp, 1094 pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown, 1095 udp_sockaddr, sosend, soreceive, sopoll, in_pcbsosetlabel 1096 };
Cache object: ef68e519eacbd7409567df4c93ebed6e
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