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 struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; 124 #ifdef INET6 125 struct udp_in6 { 126 struct sockaddr_in6 uin6_sin; 127 u_char uin6_init_done : 1; 128 } udp_in6 = { 129 { sizeof(udp_in6.uin6_sin), AF_INET6 }, 130 0 131 }; 132 struct udp_ip6 { 133 struct ip6_hdr uip6_ip6; 134 u_char uip6_init_done : 1; 135 } udp_ip6; 136 #endif /* INET6 */ 137 138 static void udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, 139 int off); 140 #ifdef INET6 141 static void ip_2_ip6_hdr(struct ip6_hdr *ip6, struct ip *ip); 142 #endif 143 144 static int udp_detach(struct socket *so); 145 static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *, 146 struct mbuf *, struct thread *); 147 148 void 149 udp_init() 150 { 151 INP_INFO_LOCK_INIT(&udbinfo, "udp"); 152 LIST_INIT(&udb); 153 udbinfo.listhead = &udb; 154 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask); 155 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB, 156 &udbinfo.porthashmask); 157 udbinfo.ipi_zone = uma_zcreate("udpcb", sizeof(struct inpcb), NULL, 158 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 159 uma_zone_set_max(udbinfo.ipi_zone, maxsockets); 160 } 161 162 void 163 udp_input(m, off) 164 register struct mbuf *m; 165 int off; 166 { 167 int iphlen = off; 168 register struct ip *ip; 169 register struct udphdr *uh; 170 register struct inpcb *inp; 171 struct mbuf *opts = 0; 172 int len; 173 struct ip save_ip; 174 175 udpstat.udps_ipackets++; 176 177 /* 178 * Strip IP options, if any; should skip this, 179 * make available to user, and use on returned packets, 180 * but we don't yet have a way to check the checksum 181 * with options still present. 182 */ 183 if (iphlen > sizeof (struct ip)) { 184 ip_stripoptions(m, (struct mbuf *)0); 185 iphlen = sizeof(struct ip); 186 } 187 188 /* 189 * Get IP and UDP header together in first mbuf. 190 */ 191 ip = mtod(m, struct ip *); 192 if (m->m_len < iphlen + sizeof(struct udphdr)) { 193 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { 194 udpstat.udps_hdrops++; 195 return; 196 } 197 ip = mtod(m, struct ip *); 198 } 199 uh = (struct udphdr *)((caddr_t)ip + iphlen); 200 201 /* destination port of 0 is illegal, based on RFC768. */ 202 if (uh->uh_dport == 0) 203 goto badunlocked; 204 205 /* 206 * Construct sockaddr format source address. 207 * Stuff source address and datagram in user buffer. 208 */ 209 udp_in.sin_port = uh->uh_sport; 210 udp_in.sin_addr = ip->ip_src; 211 #ifdef INET6 212 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0; 213 #endif 214 215 /* 216 * Make mbuf data length reflect UDP length. 217 * If not enough data to reflect UDP length, drop. 218 */ 219 len = ntohs((u_short)uh->uh_ulen); 220 if (ip->ip_len != len) { 221 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 222 udpstat.udps_badlen++; 223 goto badunlocked; 224 } 225 m_adj(m, len - ip->ip_len); 226 /* ip->ip_len = len; */ 227 } 228 /* 229 * Save a copy of the IP header in case we want restore it 230 * for sending an ICMP error message in response. 231 */ 232 if (!blackhole) 233 save_ip = *ip; 234 235 /* 236 * Checksum extended UDP header and data. 237 */ 238 if (uh->uh_sum) { 239 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 240 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 241 uh->uh_sum = m->m_pkthdr.csum_data; 242 else 243 uh->uh_sum = in_pseudo(ip->ip_src.s_addr, 244 ip->ip_dst.s_addr, htonl((u_short)len + 245 m->m_pkthdr.csum_data + IPPROTO_UDP)); 246 uh->uh_sum ^= 0xffff; 247 } else { 248 char b[9]; 249 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 250 bzero(((struct ipovly *)ip)->ih_x1, 9); 251 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 252 uh->uh_sum = in_cksum(m, len + sizeof (struct ip)); 253 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 254 } 255 if (uh->uh_sum) { 256 udpstat.udps_badsum++; 257 m_freem(m); 258 return; 259 } 260 } else 261 udpstat.udps_nosum++; 262 263 INP_INFO_RLOCK(&udbinfo); 264 265 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 266 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { 267 struct inpcb *last; 268 /* 269 * Deliver a multicast or broadcast datagram to *all* sockets 270 * for which the local and remote addresses and ports match 271 * those of the incoming datagram. This allows more than 272 * one process to receive multi/broadcasts on the same port. 273 * (This really ought to be done for unicast datagrams as 274 * well, but that would cause problems with existing 275 * applications that open both address-specific sockets and 276 * a wildcard socket listening to the same port -- they would 277 * end up receiving duplicates of every unicast datagram. 278 * Those applications open the multiple sockets to overcome an 279 * inadequacy of the UDP socket interface, but for backwards 280 * compatibility we avoid the problem here rather than 281 * fixing the interface. Maybe 4.5BSD will remedy this?) 282 */ 283 284 /* 285 * Locate pcb(s) for datagram. 286 * (Algorithm copied from raw_intr().) 287 */ 288 last = NULL; 289 LIST_FOREACH(inp, &udb, inp_list) { 290 INP_LOCK(inp); 291 if (inp->inp_lport != uh->uh_dport) { 292 docontinue: 293 INP_UNLOCK(inp); 294 continue; 295 } 296 #ifdef INET6 297 if ((inp->inp_vflag & INP_IPV4) == 0) 298 goto docontinue; 299 #endif 300 if (inp->inp_laddr.s_addr != INADDR_ANY) { 301 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 302 goto docontinue; 303 } 304 if (inp->inp_faddr.s_addr != INADDR_ANY) { 305 if (inp->inp_faddr.s_addr != 306 ip->ip_src.s_addr || 307 inp->inp_fport != uh->uh_sport) 308 goto docontinue; 309 } 310 311 /* 312 * Check multicast packets to make sure they are only 313 * sent to sockets with multicast memberships for the 314 * packet's destination address and arrival interface 315 */ 316 #define MSHIP(_inp, n) ((_inp)->inp_moptions->imo_membership[(n)]) 317 #define NMSHIPS(_inp) ((_inp)->inp_moptions->imo_num_memberships) 318 if (strict_mcast_mship && inp->inp_moptions != NULL) { 319 int mship, foundmship = 0; 320 321 for (mship = 0; mship < NMSHIPS(inp); mship++) { 322 if (MSHIP(inp, mship)->inm_addr.s_addr 323 == ip->ip_dst.s_addr && 324 MSHIP(inp, mship)->inm_ifp 325 == m->m_pkthdr.rcvif) { 326 foundmship = 1; 327 break; 328 } 329 } 330 if (foundmship == 0) 331 goto docontinue; 332 } 333 #undef NMSHIPS 334 #undef MSHIP 335 if (last != NULL) { 336 struct mbuf *n; 337 338 n = m_copy(m, 0, M_COPYALL); 339 if (n != NULL) 340 udp_append(last, ip, n, 341 iphlen + 342 sizeof(struct udphdr)); 343 INP_UNLOCK(last); 344 } 345 last = inp; 346 /* 347 * Don't look for additional matches if this one does 348 * not have either the SO_REUSEPORT or SO_REUSEADDR 349 * socket options set. This heuristic avoids searching 350 * through all pcbs in the common case of a non-shared 351 * port. It * assumes that an application will never 352 * clear these options after setting them. 353 */ 354 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0) 355 break; 356 } 357 358 if (last == NULL) { 359 /* 360 * No matching pcb found; discard datagram. 361 * (No need to send an ICMP Port Unreachable 362 * for a broadcast or multicast datgram.) 363 */ 364 udpstat.udps_noportbcast++; 365 goto badheadlocked; 366 } 367 INP_INFO_RUNLOCK(&udbinfo); 368 udp_append(last, ip, m, iphlen + sizeof(struct udphdr)); 369 INP_UNLOCK(last); 370 return; 371 } 372 /* 373 * Locate pcb for datagram. 374 */ 375 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, 376 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 377 if (inp == NULL) { 378 if (log_in_vain) { 379 char buf[4*sizeof "123"]; 380 381 strcpy(buf, inet_ntoa(ip->ip_dst)); 382 log(LOG_INFO, 383 "Connection attempt to UDP %s:%d from %s:%d\n", 384 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 385 ntohs(uh->uh_sport)); 386 } 387 udpstat.udps_noport++; 388 if (m->m_flags & (M_BCAST | M_MCAST)) { 389 udpstat.udps_noportbcast++; 390 goto badheadlocked; 391 } 392 if (blackhole) 393 goto badheadlocked; 394 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 395 goto badheadlocked; 396 *ip = save_ip; 397 ip->ip_len += iphlen; 398 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 399 INP_INFO_RUNLOCK(&udbinfo); 400 return; 401 } 402 INP_LOCK(inp); 403 INP_INFO_RUNLOCK(&udbinfo); 404 udp_append(inp, ip, m, iphlen + sizeof(struct udphdr)); 405 INP_UNLOCK(inp); 406 return; 407 408 badheadlocked: 409 INP_INFO_RUNLOCK(&udbinfo); 410 if (inp) 411 INP_UNLOCK(inp); 412 badunlocked: 413 m_freem(m); 414 if (opts) 415 m_freem(opts); 416 return; 417 } 418 419 #ifdef INET6 420 static void 421 ip_2_ip6_hdr(ip6, ip) 422 struct ip6_hdr *ip6; 423 struct ip *ip; 424 { 425 bzero(ip6, sizeof(*ip6)); 426 427 ip6->ip6_vfc = IPV6_VERSION; 428 ip6->ip6_plen = ip->ip_len; 429 ip6->ip6_nxt = ip->ip_p; 430 ip6->ip6_hlim = ip->ip_ttl; 431 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] = 432 IPV6_ADDR_INT32_SMP; 433 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr; 434 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr; 435 } 436 #endif 437 438 /* 439 * subroutine of udp_input(), mainly for source code readability. 440 * caller must properly init udp_ip6 and udp_in6 beforehand. 441 */ 442 static void 443 udp_append(last, ip, n, off) 444 struct inpcb *last; 445 struct ip *ip; 446 struct mbuf *n; 447 int off; 448 { 449 struct sockaddr *append_sa; 450 struct mbuf *opts = 0; 451 452 INP_LOCK_ASSERT(last); 453 454 #if defined(IPSEC) || defined(FAST_IPSEC) 455 /* check AH/ESP integrity. */ 456 if (ipsec4_in_reject(n, last)) { 457 #ifdef IPSEC 458 ipsecstat.in_polvio++; 459 #endif /*IPSEC*/ 460 m_freem(n); 461 return; 462 } 463 #endif /*IPSEC || FAST_IPSEC*/ 464 #ifdef MAC 465 if (mac_check_inpcb_deliver(last, n) != 0) { 466 m_freem(n); 467 return; 468 } 469 #endif 470 if (last->inp_flags & INP_CONTROLOPTS || 471 last->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) { 472 #ifdef INET6 473 if (last->inp_vflag & INP_IPV6) { 474 int savedflags; 475 476 if (udp_ip6.uip6_init_done == 0) { 477 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 478 udp_ip6.uip6_init_done = 1; 479 } 480 savedflags = last->inp_flags; 481 last->inp_flags &= ~INP_UNMAPPABLEOPTS; 482 ip6_savecontrol(last, n, &opts); 483 last->inp_flags = savedflags; 484 } else 485 #endif 486 ip_savecontrol(last, &opts, ip, n); 487 } 488 #ifdef INET6 489 if (last->inp_vflag & INP_IPV6) { 490 if (udp_in6.uin6_init_done == 0) { 491 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 492 udp_in6.uin6_init_done = 1; 493 } 494 append_sa = (struct sockaddr *)&udp_in6.uin6_sin; 495 } else 496 #endif 497 append_sa = (struct sockaddr *)&udp_in; 498 m_adj(n, off); 499 if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) { 500 m_freem(n); 501 if (opts) 502 m_freem(opts); 503 udpstat.udps_fullsock++; 504 } else 505 sorwakeup(last->inp_socket); 506 } 507 508 /* 509 * Notify a udp user of an asynchronous error; 510 * just wake up so that he can collect error status. 511 */ 512 struct inpcb * 513 udp_notify(inp, errno) 514 register struct inpcb *inp; 515 int errno; 516 { 517 inp->inp_socket->so_error = errno; 518 sorwakeup(inp->inp_socket); 519 sowwakeup(inp->inp_socket); 520 return inp; 521 } 522 523 void 524 udp_ctlinput(cmd, sa, vip) 525 int cmd; 526 struct sockaddr *sa; 527 void *vip; 528 { 529 struct ip *ip = vip; 530 struct udphdr *uh; 531 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 532 struct in_addr faddr; 533 struct inpcb *inp; 534 int s; 535 536 faddr = ((struct sockaddr_in *)sa)->sin_addr; 537 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 538 return; 539 540 /* 541 * Redirects don't need to be handled up here. 542 */ 543 if (PRC_IS_REDIRECT(cmd)) 544 return; 545 /* 546 * Hostdead is ugly because it goes linearly through all PCBs. 547 * XXX: We never get this from ICMP, otherwise it makes an 548 * excellent DoS attack on machines with many connections. 549 */ 550 if (cmd == PRC_HOSTDEAD) 551 ip = 0; 552 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 553 return; 554 if (ip) { 555 s = splnet(); 556 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 557 INP_INFO_RLOCK(&udbinfo); 558 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport, 559 ip->ip_src, uh->uh_sport, 0, NULL); 560 if (inp != NULL) { 561 INP_LOCK(inp); 562 if (inp->inp_socket != NULL) { 563 (*notify)(inp, inetctlerrmap[cmd]); 564 } 565 INP_UNLOCK(inp); 566 } 567 INP_INFO_RUNLOCK(&udbinfo); 568 splx(s); 569 } else 570 in_pcbnotifyall(&udbinfo, faddr, inetctlerrmap[cmd], notify); 571 } 572 573 static int 574 udp_pcblist(SYSCTL_HANDLER_ARGS) 575 { 576 int error, i, n, s; 577 struct inpcb *inp, **inp_list; 578 inp_gen_t gencnt; 579 struct xinpgen xig; 580 581 /* 582 * The process of preparing the TCB list is too time-consuming and 583 * resource-intensive to repeat twice on every request. 584 */ 585 if (req->oldptr == 0) { 586 n = udbinfo.ipi_count; 587 req->oldidx = 2 * (sizeof xig) 588 + (n + n/8) * sizeof(struct xinpcb); 589 return 0; 590 } 591 592 if (req->newptr != 0) 593 return EPERM; 594 595 /* 596 * OK, now we're committed to doing something. 597 */ 598 s = splnet(); 599 INP_INFO_RLOCK(&udbinfo); 600 gencnt = udbinfo.ipi_gencnt; 601 n = udbinfo.ipi_count; 602 INP_INFO_RUNLOCK(&udbinfo); 603 splx(s); 604 605 error = sysctl_wire_old_buffer(req, 2 * (sizeof xig) 606 + n * sizeof(struct xinpcb)); 607 if (error != 0) 608 return (error); 609 610 xig.xig_len = sizeof xig; 611 xig.xig_count = n; 612 xig.xig_gen = gencnt; 613 xig.xig_sogen = so_gencnt; 614 error = SYSCTL_OUT(req, &xig, sizeof xig); 615 if (error) 616 return error; 617 618 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 619 if (inp_list == 0) 620 return ENOMEM; 621 622 s = splnet(); 623 INP_INFO_RLOCK(&udbinfo); 624 for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n; 625 inp = LIST_NEXT(inp, inp_list)) { 626 INP_LOCK(inp); 627 if (inp->inp_gencnt <= gencnt && 628 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) 629 inp_list[i++] = inp; 630 INP_UNLOCK(inp); 631 } 632 INP_INFO_RUNLOCK(&udbinfo); 633 splx(s); 634 n = i; 635 636 error = 0; 637 for (i = 0; i < n; i++) { 638 inp = inp_list[i]; 639 if (inp->inp_gencnt <= gencnt) { 640 struct xinpcb xi; 641 xi.xi_len = sizeof xi; 642 /* XXX should avoid extra copy */ 643 bcopy(inp, &xi.xi_inp, sizeof *inp); 644 if (inp->inp_socket) 645 sotoxsocket(inp->inp_socket, &xi.xi_socket); 646 xi.xi_inp.inp_gencnt = inp->inp_gencnt; 647 error = SYSCTL_OUT(req, &xi, sizeof xi); 648 } 649 } 650 if (!error) { 651 /* 652 * Give the user an updated idea of our state. 653 * If the generation differs from what we told 654 * her before, she knows that something happened 655 * while we were processing this request, and it 656 * might be necessary to retry. 657 */ 658 s = splnet(); 659 INP_INFO_RLOCK(&udbinfo); 660 xig.xig_gen = udbinfo.ipi_gencnt; 661 xig.xig_sogen = so_gencnt; 662 xig.xig_count = udbinfo.ipi_count; 663 INP_INFO_RUNLOCK(&udbinfo); 664 splx(s); 665 error = SYSCTL_OUT(req, &xig, sizeof xig); 666 } 667 free(inp_list, M_TEMP); 668 return error; 669 } 670 671 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 672 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 673 674 static int 675 udp_getcred(SYSCTL_HANDLER_ARGS) 676 { 677 struct xucred xuc; 678 struct sockaddr_in addrs[2]; 679 struct inpcb *inp; 680 int error, s; 681 682 error = suser_cred(req->td->td_ucred, PRISON_ROOT); 683 if (error) 684 return (error); 685 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 686 if (error) 687 return (error); 688 s = splnet(); 689 INP_INFO_RLOCK(&udbinfo); 690 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 691 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 692 if (inp == NULL || inp->inp_socket == NULL) { 693 error = ENOENT; 694 goto out; 695 } 696 error = cr_canseesocket(req->td->td_ucred, inp->inp_socket); 697 if (error) 698 goto out; 699 cru2x(inp->inp_socket->so_cred, &xuc); 700 out: 701 INP_INFO_RUNLOCK(&udbinfo); 702 splx(s); 703 if (error == 0) 704 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 705 return (error); 706 } 707 708 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, 709 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, 710 udp_getcred, "S,xucred", "Get the xucred of a UDP connection"); 711 712 static int 713 udp_output(inp, m, addr, control, td) 714 register struct inpcb *inp; 715 struct mbuf *m; 716 struct sockaddr *addr; 717 struct mbuf *control; 718 struct thread *td; 719 { 720 register struct udpiphdr *ui; 721 register int len = m->m_pkthdr.len; 722 struct in_addr faddr, laddr; 723 struct cmsghdr *cm; 724 struct sockaddr_in *sin, src; 725 int error = 0; 726 int ipflags; 727 u_short fport, lport; 728 729 INP_LOCK_ASSERT(inp); 730 #ifdef MAC 731 mac_create_mbuf_from_inpcb(inp, m); 732 #endif 733 734 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 735 error = EMSGSIZE; 736 if (control) 737 m_freem(control); 738 goto release; 739 } 740 741 src.sin_addr.s_addr = INADDR_ANY; 742 if (control != NULL) { 743 /* 744 * XXX: Currently, we assume all the optional information 745 * is stored in a single mbuf. 746 */ 747 if (control->m_next) { 748 error = EINVAL; 749 m_freem(control); 750 goto release; 751 } 752 for (; control->m_len > 0; 753 control->m_data += CMSG_ALIGN(cm->cmsg_len), 754 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 755 cm = mtod(control, struct cmsghdr *); 756 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0 || 757 cm->cmsg_len > control->m_len) { 758 error = EINVAL; 759 break; 760 } 761 if (cm->cmsg_level != IPPROTO_IP) 762 continue; 763 764 switch (cm->cmsg_type) { 765 case IP_SENDSRCADDR: 766 if (cm->cmsg_len != 767 CMSG_LEN(sizeof(struct in_addr))) { 768 error = EINVAL; 769 break; 770 } 771 bzero(&src, sizeof(src)); 772 src.sin_family = AF_INET; 773 src.sin_len = sizeof(src); 774 src.sin_port = inp->inp_lport; 775 src.sin_addr = *(struct in_addr *)CMSG_DATA(cm); 776 break; 777 default: 778 error = ENOPROTOOPT; 779 break; 780 } 781 if (error) 782 break; 783 } 784 m_freem(control); 785 } 786 if (error) 787 goto release; 788 laddr = inp->inp_laddr; 789 lport = inp->inp_lport; 790 if (src.sin_addr.s_addr != INADDR_ANY) { 791 if (lport == 0) { 792 error = EINVAL; 793 goto release; 794 } 795 error = in_pcbbind_setup(inp, (struct sockaddr *)&src, 796 &laddr.s_addr, &lport, td->td_ucred); 797 if (error) 798 goto release; 799 } 800 801 if (addr) { 802 sin = (struct sockaddr_in *)addr; 803 if (td && jailed(td->td_ucred)) 804 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr); 805 if (inp->inp_faddr.s_addr != INADDR_ANY) { 806 error = EISCONN; 807 goto release; 808 } 809 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, &lport, 810 &faddr.s_addr, &fport, NULL, td->td_ucred); 811 if (error) 812 goto release; 813 814 /* Commit the local port if newly assigned. */ 815 if (inp->inp_laddr.s_addr == INADDR_ANY && 816 inp->inp_lport == 0) { 817 inp->inp_lport = lport; 818 if (in_pcbinshash(inp) != 0) { 819 inp->inp_lport = 0; 820 error = EAGAIN; 821 goto release; 822 } 823 inp->inp_flags |= INP_ANONPORT; 824 } 825 } else { 826 faddr = inp->inp_faddr; 827 fport = inp->inp_fport; 828 if (faddr.s_addr == INADDR_ANY) { 829 error = ENOTCONN; 830 goto release; 831 } 832 } 833 /* 834 * Calculate data length and get a mbuf 835 * for UDP and IP headers. 836 */ 837 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 838 if (m == 0) { 839 error = ENOBUFS; 840 goto release; 841 } 842 843 /* 844 * Fill in mbuf with extended UDP header 845 * and addresses and length put into network format. 846 */ 847 ui = mtod(m, struct udpiphdr *); 848 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ 849 ui->ui_pr = IPPROTO_UDP; 850 ui->ui_src = laddr; 851 ui->ui_dst = faddr; 852 ui->ui_sport = lport; 853 ui->ui_dport = fport; 854 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 855 856 ipflags = inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST); 857 if (inp->inp_flags & INP_ONESBCAST) 858 ipflags |= IP_SENDONES; 859 860 /* 861 * Set up checksum and output datagram. 862 */ 863 if (udpcksum) { 864 if (inp->inp_flags & INP_ONESBCAST) 865 faddr.s_addr = INADDR_BROADCAST; 866 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr, 867 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 868 m->m_pkthdr.csum_flags = CSUM_UDP; 869 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 870 } else { 871 ui->ui_sum = 0; 872 } 873 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 874 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 875 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 876 udpstat.udps_opackets++; 877 878 error = ip_output(m, inp->inp_options, NULL, ipflags, 879 inp->inp_moptions, inp); 880 return (error); 881 882 release: 883 m_freem(m); 884 return (error); 885 } 886 887 u_long udp_sendspace = 9216; /* really max datagram size */ 888 /* 40 1K datagrams */ 889 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 890 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 891 892 u_long udp_recvspace = 40 * (1024 + 893 #ifdef INET6 894 sizeof(struct sockaddr_in6) 895 #else 896 sizeof(struct sockaddr_in) 897 #endif 898 ); 899 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 900 &udp_recvspace, 0, "Maximum space for incoming UDP datagrams"); 901 902 static int 903 udp_abort(struct socket *so) 904 { 905 struct inpcb *inp; 906 int s; 907 908 INP_INFO_WLOCK(&udbinfo); 909 inp = sotoinpcb(so); 910 if (inp == 0) { 911 INP_INFO_WUNLOCK(&udbinfo); 912 return EINVAL; /* ??? possible? panic instead? */ 913 } 914 INP_LOCK(inp); 915 soisdisconnected(so); 916 s = splnet(); 917 in_pcbdetach(inp); 918 INP_INFO_WUNLOCK(&udbinfo); 919 splx(s); 920 return 0; 921 } 922 923 static int 924 udp_attach(struct socket *so, int proto, struct thread *td) 925 { 926 struct inpcb *inp; 927 int s, error; 928 929 INP_INFO_WLOCK(&udbinfo); 930 inp = sotoinpcb(so); 931 if (inp != 0) { 932 INP_INFO_WUNLOCK(&udbinfo); 933 return EINVAL; 934 } 935 error = soreserve(so, udp_sendspace, udp_recvspace); 936 if (error) { 937 INP_INFO_WUNLOCK(&udbinfo); 938 return error; 939 } 940 s = splnet(); 941 error = in_pcballoc(so, &udbinfo, "udpinp"); 942 splx(s); 943 if (error) { 944 INP_INFO_WUNLOCK(&udbinfo); 945 return error; 946 } 947 948 inp = (struct inpcb *)so->so_pcb; 949 INP_LOCK(inp); 950 INP_INFO_WUNLOCK(&udbinfo); 951 inp->inp_vflag |= INP_IPV4; 952 inp->inp_ip_ttl = ip_defttl; 953 INP_UNLOCK(inp); 954 return 0; 955 } 956 957 static int 958 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 959 { 960 struct inpcb *inp; 961 int s, error; 962 963 INP_INFO_WLOCK(&udbinfo); 964 inp = sotoinpcb(so); 965 if (inp == 0) { 966 INP_INFO_WUNLOCK(&udbinfo); 967 return EINVAL; 968 } 969 INP_LOCK(inp); 970 s = splnet(); 971 error = in_pcbbind(inp, nam, td->td_ucred); 972 splx(s); 973 INP_UNLOCK(inp); 974 INP_INFO_WUNLOCK(&udbinfo); 975 return error; 976 } 977 978 static int 979 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 980 { 981 struct inpcb *inp; 982 int s, error; 983 struct sockaddr_in *sin; 984 985 INP_INFO_WLOCK(&udbinfo); 986 inp = sotoinpcb(so); 987 if (inp == 0) { 988 INP_INFO_WUNLOCK(&udbinfo); 989 return EINVAL; 990 } 991 INP_LOCK(inp); 992 if (inp->inp_faddr.s_addr != INADDR_ANY) { 993 INP_UNLOCK(inp); 994 INP_INFO_WUNLOCK(&udbinfo); 995 return EISCONN; 996 } 997 s = splnet(); 998 sin = (struct sockaddr_in *)nam; 999 if (td && jailed(td->td_ucred)) 1000 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr); 1001 error = in_pcbconnect(inp, nam, td->td_ucred); 1002 splx(s); 1003 if (error == 0) 1004 soisconnected(so); 1005 INP_UNLOCK(inp); 1006 INP_INFO_WUNLOCK(&udbinfo); 1007 return error; 1008 } 1009 1010 static int 1011 udp_detach(struct socket *so) 1012 { 1013 struct inpcb *inp; 1014 int s; 1015 1016 INP_INFO_WLOCK(&udbinfo); 1017 inp = sotoinpcb(so); 1018 if (inp == 0) { 1019 INP_INFO_WUNLOCK(&udbinfo); 1020 return EINVAL; 1021 } 1022 INP_LOCK(inp); 1023 s = splnet(); 1024 in_pcbdetach(inp); 1025 INP_INFO_WUNLOCK(&udbinfo); 1026 splx(s); 1027 return 0; 1028 } 1029 1030 static int 1031 udp_disconnect(struct socket *so) 1032 { 1033 struct inpcb *inp; 1034 int s; 1035 1036 INP_INFO_WLOCK(&udbinfo); 1037 inp = sotoinpcb(so); 1038 if (inp == 0) { 1039 INP_INFO_WUNLOCK(&udbinfo); 1040 return EINVAL; 1041 } 1042 INP_LOCK(inp); 1043 if (inp->inp_faddr.s_addr == INADDR_ANY) { 1044 INP_INFO_WUNLOCK(&udbinfo); 1045 INP_UNLOCK(inp); 1046 return ENOTCONN; 1047 } 1048 1049 s = splnet(); 1050 in_pcbdisconnect(inp); 1051 inp->inp_laddr.s_addr = INADDR_ANY; 1052 INP_UNLOCK(inp); 1053 INP_INFO_WUNLOCK(&udbinfo); 1054 splx(s); 1055 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1056 return 0; 1057 } 1058 1059 static int 1060 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 1061 struct mbuf *control, struct thread *td) 1062 { 1063 struct inpcb *inp; 1064 int ret; 1065 1066 INP_INFO_WLOCK(&udbinfo); 1067 inp = sotoinpcb(so); 1068 if (inp == 0) { 1069 INP_INFO_WUNLOCK(&udbinfo); 1070 m_freem(m); 1071 return EINVAL; 1072 } 1073 INP_LOCK(inp); 1074 ret = udp_output(inp, m, addr, control, td); 1075 INP_UNLOCK(inp); 1076 INP_INFO_WUNLOCK(&udbinfo); 1077 return ret; 1078 } 1079 1080 int 1081 udp_shutdown(struct socket *so) 1082 { 1083 struct inpcb *inp; 1084 1085 INP_INFO_RLOCK(&udbinfo); 1086 inp = sotoinpcb(so); 1087 if (inp == 0) { 1088 INP_INFO_RUNLOCK(&udbinfo); 1089 return EINVAL; 1090 } 1091 INP_LOCK(inp); 1092 INP_INFO_RUNLOCK(&udbinfo); 1093 socantsendmore(so); 1094 INP_UNLOCK(inp); 1095 return 0; 1096 } 1097 1098 /* 1099 * This is the wrapper function for in_setsockaddr. We just pass down 1100 * the pcbinfo for in_setsockaddr to lock. We don't want to do the locking 1101 * here because in_setsockaddr will call malloc and might block. 1102 */ 1103 static int 1104 udp_sockaddr(struct socket *so, struct sockaddr **nam) 1105 { 1106 return (in_setsockaddr(so, nam, &udbinfo)); 1107 } 1108 1109 /* 1110 * This is the wrapper function for in_setpeeraddr. We just pass down 1111 * the pcbinfo for in_setpeeraddr to lock. 1112 */ 1113 static int 1114 udp_peeraddr(struct socket *so, struct sockaddr **nam) 1115 { 1116 return (in_setpeeraddr(so, nam, &udbinfo)); 1117 } 1118 1119 struct pr_usrreqs udp_usrreqs = { 1120 udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect, 1121 pru_connect2_notsupp, in_control, udp_detach, udp_disconnect, 1122 pru_listen_notsupp, udp_peeraddr, pru_rcvd_notsupp, 1123 pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown, 1124 udp_sockaddr, sosend, soreceive, sopoll, in_pcbsosetlabel 1125 }; 1126