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 #if defined(IPSEC) || defined(FAST_IPSEC) 453 /* check AH/ESP integrity. */ 454 if (ipsec4_in_reject(n, last)) { 455 #ifdef IPSEC 456 ipsecstat.in_polvio++; 457 #endif /*IPSEC*/ 458 m_freem(n); 459 return; 460 } 461 #endif /*IPSEC || FAST_IPSEC*/ 462 #ifdef MAC 463 if (mac_check_inpcb_deliver(last, n) != 0) { 464 m_freem(n); 465 return; 466 } 467 #endif 468 if (last->inp_flags & INP_CONTROLOPTS || 469 last->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) { 470 #ifdef INET6 471 if (last->inp_vflag & INP_IPV6) { 472 int savedflags; 473 474 if (udp_ip6.uip6_init_done == 0) { 475 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 476 udp_ip6.uip6_init_done = 1; 477 } 478 savedflags = last->inp_flags; 479 last->inp_flags &= ~INP_UNMAPPABLEOPTS; 480 ip6_savecontrol(last, n, &opts); 481 last->inp_flags = savedflags; 482 } else 483 #endif 484 ip_savecontrol(last, &opts, ip, n); 485 } 486 #ifdef INET6 487 if (last->inp_vflag & INP_IPV6) { 488 if (udp_in6.uin6_init_done == 0) { 489 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 490 udp_in6.uin6_init_done = 1; 491 } 492 append_sa = (struct sockaddr *)&udp_in6.uin6_sin; 493 } else 494 #endif 495 append_sa = (struct sockaddr *)&udp_in; 496 m_adj(n, off); 497 if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) { 498 m_freem(n); 499 if (opts) 500 m_freem(opts); 501 udpstat.udps_fullsock++; 502 } else 503 sorwakeup(last->inp_socket); 504 } 505 506 /* 507 * Notify a udp user of an asynchronous error; 508 * just wake up so that he can collect error status. 509 */ 510 struct inpcb * 511 udp_notify(inp, errno) 512 register struct inpcb *inp; 513 int errno; 514 { 515 inp->inp_socket->so_error = errno; 516 sorwakeup(inp->inp_socket); 517 sowwakeup(inp->inp_socket); 518 return inp; 519 } 520 521 void 522 udp_ctlinput(cmd, sa, vip) 523 int cmd; 524 struct sockaddr *sa; 525 void *vip; 526 { 527 struct ip *ip = vip; 528 struct udphdr *uh; 529 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 530 struct in_addr faddr; 531 struct inpcb *inp; 532 int s; 533 534 faddr = ((struct sockaddr_in *)sa)->sin_addr; 535 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 536 return; 537 538 /* 539 * Redirects don't need to be handled up here. 540 */ 541 if (PRC_IS_REDIRECT(cmd)) 542 return; 543 /* 544 * Hostdead is ugly because it goes linearly through all PCBs. 545 * XXX: We never get this from ICMP, otherwise it makes an 546 * excellent DoS attack on machines with many connections. 547 */ 548 if (cmd == PRC_HOSTDEAD) 549 ip = 0; 550 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 551 return; 552 if (ip) { 553 s = splnet(); 554 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 555 INP_INFO_RLOCK(&udbinfo); 556 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport, 557 ip->ip_src, uh->uh_sport, 0, NULL); 558 if (inp != NULL) { 559 INP_LOCK(inp); 560 if (inp->inp_socket != NULL) { 561 (*notify)(inp, inetctlerrmap[cmd]); 562 } 563 INP_UNLOCK(inp); 564 } 565 INP_INFO_RUNLOCK(&udbinfo); 566 splx(s); 567 } else 568 in_pcbnotifyall(&udbinfo, faddr, inetctlerrmap[cmd], notify); 569 } 570 571 static int 572 udp_pcblist(SYSCTL_HANDLER_ARGS) 573 { 574 int error, i, n, s; 575 struct inpcb *inp, **inp_list; 576 inp_gen_t gencnt; 577 struct xinpgen xig; 578 579 /* 580 * The process of preparing the TCB list is too time-consuming and 581 * resource-intensive to repeat twice on every request. 582 */ 583 if (req->oldptr == 0) { 584 n = udbinfo.ipi_count; 585 req->oldidx = 2 * (sizeof xig) 586 + (n + n/8) * sizeof(struct xinpcb); 587 return 0; 588 } 589 590 if (req->newptr != 0) 591 return EPERM; 592 593 /* 594 * OK, now we're committed to doing something. 595 */ 596 s = splnet(); 597 INP_INFO_RLOCK(&udbinfo); 598 gencnt = udbinfo.ipi_gencnt; 599 n = udbinfo.ipi_count; 600 INP_INFO_RUNLOCK(&udbinfo); 601 splx(s); 602 603 error = sysctl_wire_old_buffer(req, 2 * (sizeof xig) 604 + n * sizeof(struct xinpcb)); 605 if (error != 0) 606 return (error); 607 608 xig.xig_len = sizeof xig; 609 xig.xig_count = n; 610 xig.xig_gen = gencnt; 611 xig.xig_sogen = so_gencnt; 612 error = SYSCTL_OUT(req, &xig, sizeof xig); 613 if (error) 614 return error; 615 616 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 617 if (inp_list == 0) 618 return ENOMEM; 619 620 s = splnet(); 621 INP_INFO_RLOCK(&udbinfo); 622 for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n; 623 inp = LIST_NEXT(inp, inp_list)) { 624 INP_LOCK(inp); 625 if (inp->inp_gencnt <= gencnt && 626 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) 627 inp_list[i++] = inp; 628 INP_UNLOCK(inp); 629 } 630 INP_INFO_RUNLOCK(&udbinfo); 631 splx(s); 632 n = i; 633 634 error = 0; 635 for (i = 0; i < n; i++) { 636 inp = inp_list[i]; 637 if (inp->inp_gencnt <= gencnt) { 638 struct xinpcb xi; 639 xi.xi_len = sizeof xi; 640 /* XXX should avoid extra copy */ 641 bcopy(inp, &xi.xi_inp, sizeof *inp); 642 if (inp->inp_socket) 643 sotoxsocket(inp->inp_socket, &xi.xi_socket); 644 xi.xi_inp.inp_gencnt = inp->inp_gencnt; 645 error = SYSCTL_OUT(req, &xi, sizeof xi); 646 } 647 } 648 if (!error) { 649 /* 650 * Give the user an updated idea of our state. 651 * If the generation differs from what we told 652 * her before, she knows that something happened 653 * while we were processing this request, and it 654 * might be necessary to retry. 655 */ 656 s = splnet(); 657 INP_INFO_RLOCK(&udbinfo); 658 xig.xig_gen = udbinfo.ipi_gencnt; 659 xig.xig_sogen = so_gencnt; 660 xig.xig_count = udbinfo.ipi_count; 661 INP_INFO_RUNLOCK(&udbinfo); 662 splx(s); 663 error = SYSCTL_OUT(req, &xig, sizeof xig); 664 } 665 free(inp_list, M_TEMP); 666 return error; 667 } 668 669 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 670 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 671 672 static int 673 udp_getcred(SYSCTL_HANDLER_ARGS) 674 { 675 struct xucred xuc; 676 struct sockaddr_in addrs[2]; 677 struct inpcb *inp; 678 int error, s; 679 680 error = suser_cred(req->td->td_ucred, PRISON_ROOT); 681 if (error) 682 return (error); 683 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 684 if (error) 685 return (error); 686 s = splnet(); 687 INP_INFO_RLOCK(&udbinfo); 688 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 689 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 690 if (inp == NULL || inp->inp_socket == NULL) { 691 error = ENOENT; 692 goto out; 693 } 694 error = cr_canseesocket(req->td->td_ucred, inp->inp_socket); 695 if (error) 696 goto out; 697 cru2x(inp->inp_socket->so_cred, &xuc); 698 out: 699 INP_INFO_RUNLOCK(&udbinfo); 700 splx(s); 701 if (error == 0) 702 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 703 return (error); 704 } 705 706 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, 707 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, 708 udp_getcred, "S,xucred", "Get the xucred of a UDP connection"); 709 710 static int 711 udp_output(inp, m, addr, control, td) 712 register struct inpcb *inp; 713 struct mbuf *m; 714 struct sockaddr *addr; 715 struct mbuf *control; 716 struct thread *td; 717 { 718 register struct udpiphdr *ui; 719 register int len = m->m_pkthdr.len; 720 struct in_addr faddr, laddr; 721 struct cmsghdr *cm; 722 struct sockaddr_in *sin, src; 723 int error = 0; 724 int ipflags; 725 u_short fport, lport; 726 727 INP_LOCK_ASSERT(inp); 728 #ifdef MAC 729 mac_create_mbuf_from_socket(inp->inp_socket, m); 730 #endif 731 732 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 733 error = EMSGSIZE; 734 if (control) 735 m_freem(control); 736 goto release; 737 } 738 739 src.sin_addr.s_addr = INADDR_ANY; 740 if (control != NULL) { 741 /* 742 * XXX: Currently, we assume all the optional information 743 * is stored in a single mbuf. 744 */ 745 if (control->m_next) { 746 error = EINVAL; 747 m_freem(control); 748 goto release; 749 } 750 for (; control->m_len > 0; 751 control->m_data += CMSG_ALIGN(cm->cmsg_len), 752 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 753 cm = mtod(control, struct cmsghdr *); 754 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0 || 755 cm->cmsg_len > control->m_len) { 756 error = EINVAL; 757 break; 758 } 759 if (cm->cmsg_level != IPPROTO_IP) 760 continue; 761 762 switch (cm->cmsg_type) { 763 case IP_SENDSRCADDR: 764 if (cm->cmsg_len != 765 CMSG_LEN(sizeof(struct in_addr))) { 766 error = EINVAL; 767 break; 768 } 769 bzero(&src, sizeof(src)); 770 src.sin_family = AF_INET; 771 src.sin_len = sizeof(src); 772 src.sin_port = inp->inp_lport; 773 src.sin_addr = *(struct in_addr *)CMSG_DATA(cm); 774 break; 775 default: 776 error = ENOPROTOOPT; 777 break; 778 } 779 if (error) 780 break; 781 } 782 m_freem(control); 783 } 784 if (error) 785 goto release; 786 laddr = inp->inp_laddr; 787 lport = inp->inp_lport; 788 if (src.sin_addr.s_addr != INADDR_ANY) { 789 if (lport == 0) { 790 error = EINVAL; 791 goto release; 792 } 793 error = in_pcbbind_setup(inp, (struct sockaddr *)&src, 794 &laddr.s_addr, &lport, td->td_ucred); 795 if (error) 796 goto release; 797 } 798 799 if (addr) { 800 sin = (struct sockaddr_in *)addr; 801 if (td && jailed(td->td_ucred)) 802 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr); 803 if (inp->inp_faddr.s_addr != INADDR_ANY) { 804 error = EISCONN; 805 goto release; 806 } 807 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, &lport, 808 &faddr.s_addr, &fport, NULL, td->td_ucred); 809 if (error) 810 goto release; 811 812 /* Commit the local port if newly assigned. */ 813 if (inp->inp_laddr.s_addr == INADDR_ANY && 814 inp->inp_lport == 0) { 815 inp->inp_lport = lport; 816 if (in_pcbinshash(inp) != 0) { 817 inp->inp_lport = 0; 818 error = EAGAIN; 819 goto release; 820 } 821 inp->inp_flags |= INP_ANONPORT; 822 } 823 } else { 824 faddr = inp->inp_faddr; 825 fport = inp->inp_fport; 826 if (faddr.s_addr == INADDR_ANY) { 827 error = ENOTCONN; 828 goto release; 829 } 830 } 831 /* 832 * Calculate data length and get a mbuf 833 * for UDP and IP headers. 834 */ 835 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 836 if (m == 0) { 837 error = ENOBUFS; 838 goto release; 839 } 840 841 /* 842 * Fill in mbuf with extended UDP header 843 * and addresses and length put into network format. 844 */ 845 ui = mtod(m, struct udpiphdr *); 846 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ 847 ui->ui_pr = IPPROTO_UDP; 848 ui->ui_src = laddr; 849 ui->ui_dst = faddr; 850 ui->ui_sport = lport; 851 ui->ui_dport = fport; 852 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 853 854 ipflags = inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST); 855 if (inp->inp_flags & INP_ONESBCAST) 856 ipflags |= IP_SENDONES; 857 858 /* 859 * Set up checksum and output datagram. 860 */ 861 if (udpcksum) { 862 if (inp->inp_flags & INP_ONESBCAST) 863 faddr.s_addr = INADDR_BROADCAST; 864 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr, 865 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 866 m->m_pkthdr.csum_flags = CSUM_UDP; 867 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 868 } else { 869 ui->ui_sum = 0; 870 } 871 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 872 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 873 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 874 udpstat.udps_opackets++; 875 876 error = ip_output(m, inp->inp_options, NULL, ipflags, 877 inp->inp_moptions, inp); 878 return (error); 879 880 release: 881 m_freem(m); 882 return (error); 883 } 884 885 u_long udp_sendspace = 9216; /* really max datagram size */ 886 /* 40 1K datagrams */ 887 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 888 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 889 890 u_long udp_recvspace = 40 * (1024 + 891 #ifdef INET6 892 sizeof(struct sockaddr_in6) 893 #else 894 sizeof(struct sockaddr_in) 895 #endif 896 ); 897 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 898 &udp_recvspace, 0, "Maximum space for incoming UDP datagrams"); 899 900 static int 901 udp_abort(struct socket *so) 902 { 903 struct inpcb *inp; 904 int s; 905 906 INP_INFO_WLOCK(&udbinfo); 907 inp = sotoinpcb(so); 908 if (inp == 0) { 909 INP_INFO_WUNLOCK(&udbinfo); 910 return EINVAL; /* ??? possible? panic instead? */ 911 } 912 INP_LOCK(inp); 913 soisdisconnected(so); 914 s = splnet(); 915 in_pcbdetach(inp); 916 INP_INFO_WUNLOCK(&udbinfo); 917 splx(s); 918 return 0; 919 } 920 921 static int 922 udp_attach(struct socket *so, int proto, struct thread *td) 923 { 924 struct inpcb *inp; 925 int s, error; 926 927 INP_INFO_WLOCK(&udbinfo); 928 inp = sotoinpcb(so); 929 if (inp != 0) { 930 INP_INFO_WUNLOCK(&udbinfo); 931 return EINVAL; 932 } 933 error = soreserve(so, udp_sendspace, udp_recvspace); 934 if (error) { 935 INP_INFO_WUNLOCK(&udbinfo); 936 return error; 937 } 938 s = splnet(); 939 error = in_pcballoc(so, &udbinfo, "udpinp"); 940 splx(s); 941 if (error) { 942 INP_INFO_WUNLOCK(&udbinfo); 943 return error; 944 } 945 946 inp = (struct inpcb *)so->so_pcb; 947 INP_LOCK(inp); 948 INP_INFO_WUNLOCK(&udbinfo); 949 inp->inp_vflag |= INP_IPV4; 950 inp->inp_ip_ttl = ip_defttl; 951 INP_UNLOCK(inp); 952 return 0; 953 } 954 955 static int 956 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 957 { 958 struct inpcb *inp; 959 int s, error; 960 961 INP_INFO_WLOCK(&udbinfo); 962 inp = sotoinpcb(so); 963 if (inp == 0) { 964 INP_INFO_WUNLOCK(&udbinfo); 965 return EINVAL; 966 } 967 INP_LOCK(inp); 968 s = splnet(); 969 error = in_pcbbind(inp, nam, td->td_ucred); 970 splx(s); 971 INP_UNLOCK(inp); 972 INP_INFO_WUNLOCK(&udbinfo); 973 return error; 974 } 975 976 static int 977 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 978 { 979 struct inpcb *inp; 980 int s, error; 981 struct sockaddr_in *sin; 982 983 INP_INFO_WLOCK(&udbinfo); 984 inp = sotoinpcb(so); 985 if (inp == 0) { 986 INP_INFO_WUNLOCK(&udbinfo); 987 return EINVAL; 988 } 989 INP_LOCK(inp); 990 if (inp->inp_faddr.s_addr != INADDR_ANY) { 991 INP_UNLOCK(inp); 992 INP_INFO_WUNLOCK(&udbinfo); 993 return EISCONN; 994 } 995 s = splnet(); 996 sin = (struct sockaddr_in *)nam; 997 if (td && jailed(td->td_ucred)) 998 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr); 999 error = in_pcbconnect(inp, nam, td->td_ucred); 1000 splx(s); 1001 if (error == 0) 1002 soisconnected(so); 1003 INP_UNLOCK(inp); 1004 INP_INFO_WUNLOCK(&udbinfo); 1005 return error; 1006 } 1007 1008 static int 1009 udp_detach(struct socket *so) 1010 { 1011 struct inpcb *inp; 1012 int s; 1013 1014 INP_INFO_WLOCK(&udbinfo); 1015 inp = sotoinpcb(so); 1016 if (inp == 0) { 1017 INP_INFO_WUNLOCK(&udbinfo); 1018 return EINVAL; 1019 } 1020 INP_LOCK(inp); 1021 s = splnet(); 1022 in_pcbdetach(inp); 1023 INP_INFO_WUNLOCK(&udbinfo); 1024 splx(s); 1025 return 0; 1026 } 1027 1028 static int 1029 udp_disconnect(struct socket *so) 1030 { 1031 struct inpcb *inp; 1032 int s; 1033 1034 INP_INFO_WLOCK(&udbinfo); 1035 inp = sotoinpcb(so); 1036 if (inp == 0) { 1037 INP_INFO_WUNLOCK(&udbinfo); 1038 return EINVAL; 1039 } 1040 INP_LOCK(inp); 1041 if (inp->inp_faddr.s_addr == INADDR_ANY) { 1042 INP_INFO_WUNLOCK(&udbinfo); 1043 INP_UNLOCK(inp); 1044 return ENOTCONN; 1045 } 1046 1047 s = splnet(); 1048 in_pcbdisconnect(inp); 1049 inp->inp_laddr.s_addr = INADDR_ANY; 1050 INP_UNLOCK(inp); 1051 INP_INFO_WUNLOCK(&udbinfo); 1052 splx(s); 1053 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1054 return 0; 1055 } 1056 1057 static int 1058 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 1059 struct mbuf *control, struct thread *td) 1060 { 1061 struct inpcb *inp; 1062 int ret; 1063 1064 INP_INFO_WLOCK(&udbinfo); 1065 inp = sotoinpcb(so); 1066 if (inp == 0) { 1067 INP_INFO_WUNLOCK(&udbinfo); 1068 m_freem(m); 1069 return EINVAL; 1070 } 1071 INP_LOCK(inp); 1072 ret = udp_output(inp, m, addr, control, td); 1073 INP_UNLOCK(inp); 1074 INP_INFO_WUNLOCK(&udbinfo); 1075 return ret; 1076 } 1077 1078 int 1079 udp_shutdown(struct socket *so) 1080 { 1081 struct inpcb *inp; 1082 1083 INP_INFO_RLOCK(&udbinfo); 1084 inp = sotoinpcb(so); 1085 if (inp == 0) { 1086 INP_INFO_RUNLOCK(&udbinfo); 1087 return EINVAL; 1088 } 1089 INP_LOCK(inp); 1090 INP_INFO_RUNLOCK(&udbinfo); 1091 socantsendmore(so); 1092 INP_UNLOCK(inp); 1093 return 0; 1094 } 1095 1096 /* 1097 * This is the wrapper function for in_setsockaddr. We just pass down 1098 * the pcbinfo for in_setsockaddr to lock. We don't want to do the locking 1099 * here because in_setsockaddr will call malloc and might block. 1100 */ 1101 static int 1102 udp_sockaddr(struct socket *so, struct sockaddr **nam) 1103 { 1104 return (in_setsockaddr(so, nam, &udbinfo)); 1105 } 1106 1107 /* 1108 * This is the wrapper function for in_setpeeraddr. We just pass down 1109 * the pcbinfo for in_setpeeraddr to lock. 1110 */ 1111 static int 1112 udp_peeraddr(struct socket *so, struct sockaddr **nam) 1113 { 1114 return (in_setpeeraddr(so, nam, &udbinfo)); 1115 } 1116 1117 struct pr_usrreqs udp_usrreqs = { 1118 udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect, 1119 pru_connect2_notsupp, in_control, udp_detach, udp_disconnect, 1120 pru_listen_notsupp, udp_peeraddr, pru_rcvd_notsupp, 1121 pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown, 1122 udp_sockaddr, sosend, soreceive, sopoll, in_pcbsosetlabel 1123 }; 1124