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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 34 * $FreeBSD$ 35 */ 36 37 #include "opt_ipsec.h" 38 #include "opt_inet6.h" 39 #include "opt_mac.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/domain.h> 44 #include <sys/jail.h> 45 #include <sys/kernel.h> 46 #include <sys/lock.h> 47 #include <sys/mac.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/proc.h> 51 #include <sys/protosw.h> 52 #include <sys/signalvar.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 #include <sys/sx.h> 56 #include <sys/sysctl.h> 57 #include <sys/syslog.h> 58 59 #include <vm/uma.h> 60 61 #include <net/if.h> 62 #include <net/route.h> 63 64 #include <netinet/in.h> 65 #include <netinet/in_systm.h> 66 #include <netinet/in_pcb.h> 67 #include <netinet/in_var.h> 68 #include <netinet/ip.h> 69 #ifdef INET6 70 #include <netinet/ip6.h> 71 #endif 72 #include <netinet/ip_icmp.h> 73 #include <netinet/icmp_var.h> 74 #include <netinet/ip_var.h> 75 #ifdef INET6 76 #include <netinet6/ip6_var.h> 77 #endif 78 #include <netinet/udp.h> 79 #include <netinet/udp_var.h> 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 struct inpcbhead udb; /* from udp_var.h */ 108 #define udb6 udb /* for KAME src sync over BSD*'s */ 109 struct inpcbinfo udbinfo; 110 111 #ifndef UDBHASHSIZE 112 #define UDBHASHSIZE 16 113 #endif 114 115 struct udpstat udpstat; /* from udp_var.h */ 116 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW, 117 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); 118 119 static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; 120 #ifdef INET6 121 struct udp_in6 { 122 struct sockaddr_in6 uin6_sin; 123 u_char uin6_init_done : 1; 124 } udp_in6 = { 125 { sizeof(udp_in6.uin6_sin), AF_INET6 }, 126 0 127 }; 128 struct udp_ip6 { 129 struct ip6_hdr uip6_ip6; 130 u_char uip6_init_done : 1; 131 } udp_ip6; 132 #endif /* INET6 */ 133 134 static void udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, 135 int off); 136 #ifdef INET6 137 static void ip_2_ip6_hdr(struct ip6_hdr *ip6, struct ip *ip); 138 #endif 139 140 static int udp_detach(struct socket *so); 141 static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *, 142 struct mbuf *, struct thread *); 143 144 void 145 udp_init() 146 { 147 INP_INFO_LOCK_INIT(&udbinfo, "udp"); 148 LIST_INIT(&udb); 149 udbinfo.listhead = &udb; 150 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask); 151 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB, 152 &udbinfo.porthashmask); 153 udbinfo.ipi_zone = uma_zcreate("udpcb", sizeof(struct inpcb), NULL, 154 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 155 uma_zone_set_max(udbinfo.ipi_zone, maxsockets); 156 } 157 158 void 159 udp_input(m, off) 160 register struct mbuf *m; 161 int off; 162 { 163 int iphlen = off; 164 register struct ip *ip; 165 register struct udphdr *uh; 166 register struct inpcb *inp; 167 struct mbuf *opts = 0; 168 int len; 169 struct ip save_ip; 170 struct sockaddr *append_sa; 171 #ifdef MAC 172 int error; 173 #endif 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 * Make mbuf data length reflect UDP length. 207 * If not enough data to reflect UDP length, drop. 208 */ 209 len = ntohs((u_short)uh->uh_ulen); 210 if (ip->ip_len != len) { 211 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 212 udpstat.udps_badlen++; 213 goto badunlocked; 214 } 215 m_adj(m, len - ip->ip_len); 216 /* ip->ip_len = len; */ 217 } 218 /* 219 * Save a copy of the IP header in case we want restore it 220 * for sending an ICMP error message in response. 221 */ 222 if (!blackhole) 223 save_ip = *ip; 224 225 /* 226 * Checksum extended UDP header and data. 227 */ 228 if (uh->uh_sum) { 229 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 230 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 231 uh->uh_sum = m->m_pkthdr.csum_data; 232 else 233 uh->uh_sum = in_pseudo(ip->ip_src.s_addr, 234 ip->ip_dst.s_addr, htonl((u_short)len + 235 m->m_pkthdr.csum_data + IPPROTO_UDP)); 236 uh->uh_sum ^= 0xffff; 237 } else { 238 char b[9]; 239 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 240 bzero(((struct ipovly *)ip)->ih_x1, 9); 241 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 242 uh->uh_sum = in_cksum(m, len + sizeof (struct ip)); 243 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 244 } 245 if (uh->uh_sum) { 246 udpstat.udps_badsum++; 247 m_freem(m); 248 return; 249 } 250 } else 251 udpstat.udps_nosum++; 252 253 INP_INFO_RLOCK(&udbinfo); 254 255 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 256 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { 257 struct inpcb *last; 258 /* 259 * Deliver a multicast or broadcast datagram to *all* sockets 260 * for which the local and remote addresses and ports match 261 * those of the incoming datagram. This allows more than 262 * one process to receive multi/broadcasts on the same port. 263 * (This really ought to be done for unicast datagrams as 264 * well, but that would cause problems with existing 265 * applications that open both address-specific sockets and 266 * a wildcard socket listening to the same port -- they would 267 * end up receiving duplicates of every unicast datagram. 268 * Those applications open the multiple sockets to overcome an 269 * inadequacy of the UDP socket interface, but for backwards 270 * compatibility we avoid the problem here rather than 271 * fixing the interface. Maybe 4.5BSD will remedy this?) 272 */ 273 274 /* 275 * Construct sockaddr format source address. 276 */ 277 udp_in.sin_port = uh->uh_sport; 278 udp_in.sin_addr = ip->ip_src; 279 /* 280 * Locate pcb(s) for datagram. 281 * (Algorithm copied from raw_intr().) 282 */ 283 last = NULL; 284 #ifdef INET6 285 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0; 286 #endif 287 LIST_FOREACH(inp, &udb, inp_list) { 288 INP_LOCK(inp); 289 if (inp->inp_lport != uh->uh_dport) { 290 docontinue: 291 INP_UNLOCK(inp); 292 continue; 293 } 294 #ifdef INET6 295 if ((inp->inp_vflag & INP_IPV4) == 0) 296 goto docontinue; 297 #endif 298 if (inp->inp_laddr.s_addr != INADDR_ANY) { 299 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 300 goto docontinue; 301 } 302 if (inp->inp_faddr.s_addr != INADDR_ANY) { 303 if (inp->inp_faddr.s_addr != 304 ip->ip_src.s_addr || 305 inp->inp_fport != uh->uh_sport) 306 goto docontinue; 307 } 308 309 if (last != NULL) { 310 struct mbuf *n; 311 int policyfail; 312 313 policyfail = 0; 314 #ifdef IPSEC 315 /* check AH/ESP integrity. */ 316 if (ipsec4_in_reject_so(m, last->inp_socket)) { 317 ipsecstat.in_polvio++; 318 policyfail = 1; 319 /* do not inject data to pcb */ 320 } 321 #endif /*IPSEC*/ 322 #ifdef MAC 323 if (mac_check_socket_deliver(last->inp_socket, 324 m) != 0) 325 policyfail = 1; 326 #endif 327 if (!policyfail) { 328 n = m_copy(m, 0, M_COPYALL); 329 if (n != NULL) 330 udp_append(last, ip, n, 331 iphlen + 332 sizeof(struct udphdr)); 333 } 334 INP_UNLOCK(last); 335 } 336 last = inp; 337 /* 338 * Don't look for additional matches if this one does 339 * not have either the SO_REUSEPORT or SO_REUSEADDR 340 * socket options set. This heuristic avoids searching 341 * through all pcbs in the common case of a non-shared 342 * port. It * assumes that an application will never 343 * clear these options after setting them. 344 */ 345 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0) 346 break; 347 } 348 349 if (last == NULL) { 350 /* 351 * No matching pcb found; discard datagram. 352 * (No need to send an ICMP Port Unreachable 353 * for a broadcast or multicast datgram.) 354 */ 355 udpstat.udps_noportbcast++; 356 goto badheadlocked; 357 } 358 #ifdef IPSEC 359 /* check AH/ESP integrity. */ 360 if (ipsec4_in_reject_so(m, last->inp_socket)) { 361 ipsecstat.in_polvio++; 362 goto badheadlocked; 363 } 364 #endif /*IPSEC*/ 365 INP_UNLOCK(last); 366 INP_INFO_RUNLOCK(&udbinfo); 367 udp_append(last, ip, m, iphlen + sizeof(struct udphdr)); 368 return; 369 } 370 /* 371 * Locate pcb for datagram. 372 */ 373 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, 374 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 375 if (inp == NULL) { 376 if (log_in_vain) { 377 char buf[4*sizeof "123"]; 378 379 strcpy(buf, inet_ntoa(ip->ip_dst)); 380 log(LOG_INFO, 381 "Connection attempt to UDP %s:%d from %s:%d\n", 382 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 383 ntohs(uh->uh_sport)); 384 } 385 udpstat.udps_noport++; 386 if (m->m_flags & (M_BCAST | M_MCAST)) { 387 udpstat.udps_noportbcast++; 388 goto badheadlocked; 389 } 390 if (blackhole) 391 goto badheadlocked; 392 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 393 goto badheadlocked; 394 *ip = save_ip; 395 ip->ip_len += iphlen; 396 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 397 INP_INFO_RUNLOCK(&udbinfo); 398 return; 399 } 400 INP_LOCK(inp); 401 INP_INFO_RUNLOCK(&udbinfo); 402 #ifdef IPSEC 403 if (ipsec4_in_reject_so(m, inp->inp_socket)) { 404 ipsecstat.in_polvio++; 405 goto bad; 406 } 407 #endif /*IPSEC*/ 408 #ifdef MAC 409 error = mac_check_socket_deliver(inp->inp_socket, m); 410 if (error) 411 goto bad; 412 #endif 413 414 /* 415 * Construct sockaddr format source address. 416 * Stuff source address and datagram in user buffer. 417 */ 418 udp_in.sin_port = uh->uh_sport; 419 udp_in.sin_addr = ip->ip_src; 420 if (inp->inp_flags & INP_CONTROLOPTS 421 || inp->inp_socket->so_options & SO_TIMESTAMP) { 422 #ifdef INET6 423 if (inp->inp_vflag & INP_IPV6) { 424 int savedflags; 425 426 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 427 savedflags = inp->inp_flags; 428 inp->inp_flags &= ~INP_UNMAPPABLEOPTS; 429 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m); 430 inp->inp_flags = savedflags; 431 } else 432 #endif 433 ip_savecontrol(inp, &opts, ip, m); 434 } 435 m_adj(m, iphlen + sizeof(struct udphdr)); 436 #ifdef INET6 437 if (inp->inp_vflag & INP_IPV6) { 438 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 439 append_sa = (struct sockaddr *)&udp_in6; 440 } else 441 #endif 442 append_sa = (struct sockaddr *)&udp_in; 443 if (sbappendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) { 444 udpstat.udps_fullsock++; 445 goto bad; 446 } 447 sorwakeup(inp->inp_socket); 448 INP_UNLOCK(inp); 449 return; 450 451 badheadlocked: 452 INP_INFO_RUNLOCK(&udbinfo); 453 bad: 454 if (inp) 455 INP_UNLOCK(inp); 456 badunlocked: 457 m_freem(m); 458 if (opts) 459 m_freem(opts); 460 return; 461 } 462 463 #ifdef INET6 464 static void 465 ip_2_ip6_hdr(ip6, ip) 466 struct ip6_hdr *ip6; 467 struct ip *ip; 468 { 469 bzero(ip6, sizeof(*ip6)); 470 471 ip6->ip6_vfc = IPV6_VERSION; 472 ip6->ip6_plen = ip->ip_len; 473 ip6->ip6_nxt = ip->ip_p; 474 ip6->ip6_hlim = ip->ip_ttl; 475 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] = 476 IPV6_ADDR_INT32_SMP; 477 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr; 478 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr; 479 } 480 #endif 481 482 /* 483 * subroutine of udp_input(), mainly for source code readability. 484 * caller must properly init udp_ip6 and udp_in6 beforehand. 485 */ 486 static void 487 udp_append(last, ip, n, off) 488 struct inpcb *last; 489 struct ip *ip; 490 struct mbuf *n; 491 int off; 492 { 493 struct sockaddr *append_sa; 494 struct mbuf *opts = 0; 495 496 if (last->inp_flags & INP_CONTROLOPTS || 497 last->inp_socket->so_options & SO_TIMESTAMP) { 498 #ifdef INET6 499 if (last->inp_vflag & INP_IPV6) { 500 int savedflags; 501 502 if (udp_ip6.uip6_init_done == 0) { 503 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 504 udp_ip6.uip6_init_done = 1; 505 } 506 savedflags = last->inp_flags; 507 last->inp_flags &= ~INP_UNMAPPABLEOPTS; 508 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n); 509 last->inp_flags = savedflags; 510 } else 511 #endif 512 ip_savecontrol(last, &opts, ip, n); 513 } 514 #ifdef INET6 515 if (last->inp_vflag & INP_IPV6) { 516 if (udp_in6.uin6_init_done == 0) { 517 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 518 udp_in6.uin6_init_done = 1; 519 } 520 append_sa = (struct sockaddr *)&udp_in6.uin6_sin; 521 } else 522 #endif 523 append_sa = (struct sockaddr *)&udp_in; 524 m_adj(n, off); 525 if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) { 526 m_freem(n); 527 if (opts) 528 m_freem(opts); 529 udpstat.udps_fullsock++; 530 } else 531 sorwakeup(last->inp_socket); 532 } 533 534 /* 535 * Notify a udp user of an asynchronous error; 536 * just wake up so that he can collect error status. 537 */ 538 struct inpcb * 539 udp_notify(inp, errno) 540 register struct inpcb *inp; 541 int errno; 542 { 543 inp->inp_socket->so_error = errno; 544 sorwakeup(inp->inp_socket); 545 sowwakeup(inp->inp_socket); 546 return inp; 547 } 548 549 void 550 udp_ctlinput(cmd, sa, vip) 551 int cmd; 552 struct sockaddr *sa; 553 void *vip; 554 { 555 struct ip *ip = vip; 556 struct udphdr *uh; 557 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 558 struct in_addr faddr; 559 struct inpcb *inp; 560 int s; 561 562 faddr = ((struct sockaddr_in *)sa)->sin_addr; 563 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 564 return; 565 566 if (PRC_IS_REDIRECT(cmd)) { 567 ip = 0; 568 notify = in_rtchange; 569 } else if (cmd == PRC_HOSTDEAD) 570 ip = 0; 571 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 572 return; 573 if (ip) { 574 s = splnet(); 575 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 576 INP_INFO_RLOCK(&udbinfo); 577 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport, 578 ip->ip_src, uh->uh_sport, 0, NULL); 579 if (inp != NULL) { 580 INP_LOCK(inp); 581 if(inp->inp_socket != NULL) { 582 (*notify)(inp, inetctlerrmap[cmd]); 583 } 584 INP_UNLOCK(inp); 585 } 586 INP_INFO_RUNLOCK(&udbinfo); 587 splx(s); 588 } else 589 in_pcbnotifyall(&udbinfo, faddr, inetctlerrmap[cmd], notify); 590 } 591 592 static int 593 udp_pcblist(SYSCTL_HANDLER_ARGS) 594 { 595 int error, i, n, s; 596 struct inpcb *inp, **inp_list; 597 inp_gen_t gencnt; 598 struct xinpgen xig; 599 600 /* 601 * The process of preparing the TCB list is too time-consuming and 602 * resource-intensive to repeat twice on every request. 603 */ 604 if (req->oldptr == 0) { 605 n = udbinfo.ipi_count; 606 req->oldidx = 2 * (sizeof xig) 607 + (n + n/8) * sizeof(struct xinpcb); 608 return 0; 609 } 610 611 if (req->newptr != 0) 612 return EPERM; 613 614 /* 615 * OK, now we're committed to doing something. 616 */ 617 s = splnet(); 618 gencnt = udbinfo.ipi_gencnt; 619 n = udbinfo.ipi_count; 620 splx(s); 621 622 sysctl_wire_old_buffer(req, 2 * (sizeof xig) 623 + n * sizeof(struct xinpcb)); 624 625 xig.xig_len = sizeof xig; 626 xig.xig_count = n; 627 xig.xig_gen = gencnt; 628 xig.xig_sogen = so_gencnt; 629 error = SYSCTL_OUT(req, &xig, sizeof xig); 630 if (error) 631 return error; 632 633 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 634 if (inp_list == 0) 635 return ENOMEM; 636 637 s = splnet(); 638 INP_INFO_RLOCK(&udbinfo); 639 for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n; 640 inp = LIST_NEXT(inp, inp_list)) { 641 INP_LOCK(inp); 642 if (inp->inp_gencnt <= gencnt && 643 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) 644 inp_list[i++] = inp; 645 INP_UNLOCK(inp); 646 } 647 INP_INFO_RUNLOCK(&udbinfo); 648 splx(s); 649 n = i; 650 651 error = 0; 652 for (i = 0; i < n; i++) { 653 inp = inp_list[i]; 654 INP_LOCK(inp); 655 if (inp->inp_gencnt <= gencnt) { 656 struct xinpcb xi; 657 xi.xi_len = sizeof xi; 658 /* XXX should avoid extra copy */ 659 bcopy(inp, &xi.xi_inp, sizeof *inp); 660 if (inp->inp_socket) 661 sotoxsocket(inp->inp_socket, &xi.xi_socket); 662 error = SYSCTL_OUT(req, &xi, sizeof xi); 663 } 664 INP_UNLOCK(inp); 665 } 666 if (!error) { 667 /* 668 * Give the user an updated idea of our state. 669 * If the generation differs from what we told 670 * her before, she knows that something happened 671 * while we were processing this request, and it 672 * might be necessary to retry. 673 */ 674 s = splnet(); 675 INP_INFO_RLOCK(&udbinfo); 676 xig.xig_gen = udbinfo.ipi_gencnt; 677 xig.xig_sogen = so_gencnt; 678 xig.xig_count = udbinfo.ipi_count; 679 INP_INFO_RUNLOCK(&udbinfo); 680 splx(s); 681 error = SYSCTL_OUT(req, &xig, sizeof xig); 682 } 683 free(inp_list, M_TEMP); 684 return error; 685 } 686 687 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 688 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 689 690 static int 691 udp_getcred(SYSCTL_HANDLER_ARGS) 692 { 693 struct xucred xuc; 694 struct sockaddr_in addrs[2]; 695 struct inpcb *inp; 696 int error, s; 697 698 error = suser_cred(req->td->td_ucred, PRISON_ROOT); 699 if (error) 700 return (error); 701 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 702 if (error) 703 return (error); 704 s = splnet(); 705 INP_INFO_RLOCK(&udbinfo); 706 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 707 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 708 if (inp == NULL || inp->inp_socket == NULL) { 709 error = ENOENT; 710 goto out; 711 } 712 error = cr_canseesocket(req->td->td_ucred, inp->inp_socket); 713 if (error) 714 goto out; 715 cru2x(inp->inp_socket->so_cred, &xuc); 716 out: 717 INP_INFO_RUNLOCK(&udbinfo); 718 splx(s); 719 if (error == 0) 720 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 721 return (error); 722 } 723 724 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, 725 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, 726 udp_getcred, "S,xucred", "Get the xucred of a UDP connection"); 727 728 static int 729 udp_output(inp, m, addr, control, td) 730 register struct inpcb *inp; 731 struct mbuf *m; 732 struct sockaddr *addr; 733 struct mbuf *control; 734 struct thread *td; 735 { 736 register struct udpiphdr *ui; 737 register int len = m->m_pkthdr.len; 738 struct in_addr laddr; 739 struct sockaddr_in *sin; 740 int s = 0, error = 0; 741 742 #ifdef MAC 743 mac_create_mbuf_from_socket(inp->inp_socket, m); 744 #endif 745 746 if (control) 747 m_freem(control); /* XXX */ 748 749 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 750 error = EMSGSIZE; 751 goto release; 752 } 753 754 if (addr) { 755 sin = (struct sockaddr_in *)addr; 756 if (td && jailed(td->td_ucred)) 757 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr); 758 laddr = inp->inp_laddr; 759 if (inp->inp_faddr.s_addr != INADDR_ANY) { 760 error = EISCONN; 761 goto release; 762 } 763 /* 764 * Must block input while temporarily connected. 765 */ 766 s = splnet(); 767 error = in_pcbconnect(inp, addr, td); 768 if (error) { 769 splx(s); 770 goto release; 771 } 772 } else { 773 if (inp->inp_faddr.s_addr == INADDR_ANY) { 774 error = ENOTCONN; 775 goto release; 776 } 777 } 778 /* 779 * Calculate data length and get a mbuf 780 * for UDP and IP headers. 781 */ 782 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 783 if (m == 0) { 784 error = ENOBUFS; 785 if (addr) 786 splx(s); 787 goto release; 788 } 789 790 /* 791 * Fill in mbuf with extended UDP header 792 * and addresses and length put into network format. 793 */ 794 ui = mtod(m, struct udpiphdr *); 795 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ 796 ui->ui_pr = IPPROTO_UDP; 797 ui->ui_src = inp->inp_laddr; 798 ui->ui_dst = inp->inp_faddr; 799 ui->ui_sport = inp->inp_lport; 800 ui->ui_dport = inp->inp_fport; 801 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 802 803 /* 804 * Set up checksum and output datagram. 805 */ 806 if (udpcksum) { 807 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr, 808 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 809 m->m_pkthdr.csum_flags = CSUM_UDP; 810 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 811 } else { 812 ui->ui_sum = 0; 813 } 814 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 815 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 816 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 817 udpstat.udps_opackets++; 818 819 #ifdef IPSEC 820 if (ipsec_setsocket(m, inp->inp_socket) != 0) { 821 error = ENOBUFS; 822 goto release; 823 } 824 #endif /*IPSEC*/ 825 error = ip_output(m, inp->inp_options, &inp->inp_route, 826 (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)), 827 inp->inp_moptions); 828 829 if (addr) { 830 in_pcbdisconnect(inp); 831 inp->inp_laddr = laddr; /* XXX rehash? */ 832 splx(s); 833 } 834 return (error); 835 836 release: 837 m_freem(m); 838 return (error); 839 } 840 841 u_long udp_sendspace = 9216; /* really max datagram size */ 842 /* 40 1K datagrams */ 843 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 844 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 845 846 u_long udp_recvspace = 40 * (1024 + 847 #ifdef INET6 848 sizeof(struct sockaddr_in6) 849 #else 850 sizeof(struct sockaddr_in) 851 #endif 852 ); 853 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 854 &udp_recvspace, 0, "Maximum incoming UDP datagram size"); 855 856 static int 857 udp_abort(struct socket *so) 858 { 859 struct inpcb *inp; 860 int s; 861 862 INP_INFO_WLOCK(&udbinfo); 863 inp = sotoinpcb(so); 864 if (inp == 0) { 865 INP_INFO_WUNLOCK(&udbinfo); 866 return EINVAL; /* ??? possible? panic instead? */ 867 } 868 INP_LOCK(inp); 869 soisdisconnected(so); 870 s = splnet(); 871 in_pcbdetach(inp); 872 INP_INFO_WUNLOCK(&udbinfo); 873 splx(s); 874 return 0; 875 } 876 877 static int 878 udp_attach(struct socket *so, int proto, struct thread *td) 879 { 880 struct inpcb *inp; 881 int s, error; 882 883 INP_INFO_WLOCK(&udbinfo); 884 inp = sotoinpcb(so); 885 if (inp != 0) { 886 INP_INFO_WUNLOCK(&udbinfo); 887 return EINVAL; 888 } 889 error = soreserve(so, udp_sendspace, udp_recvspace); 890 if (error) { 891 INP_INFO_WUNLOCK(&udbinfo); 892 return error; 893 } 894 s = splnet(); 895 error = in_pcballoc(so, &udbinfo, td); 896 splx(s); 897 if (error) 898 return error; 899 900 inp = (struct inpcb *)so->so_pcb; 901 INP_LOCK(inp); 902 INP_INFO_WUNLOCK(&udbinfo); 903 inp->inp_vflag |= INP_IPV4; 904 inp->inp_ip_ttl = ip_defttl; 905 INP_UNLOCK(inp); 906 return 0; 907 } 908 909 static int 910 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 911 { 912 struct inpcb *inp; 913 int s, error; 914 915 INP_INFO_WLOCK(&udbinfo); 916 inp = sotoinpcb(so); 917 if (inp == 0) { 918 INP_INFO_WUNLOCK(&udbinfo); 919 return EINVAL; 920 } 921 INP_LOCK(inp); 922 s = splnet(); 923 error = in_pcbbind(inp, nam, td); 924 splx(s); 925 INP_UNLOCK(inp); 926 INP_INFO_WUNLOCK(&udbinfo); 927 return error; 928 } 929 930 static int 931 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 932 { 933 struct inpcb *inp; 934 int s, error; 935 struct sockaddr_in *sin; 936 937 INP_INFO_WLOCK(&udbinfo); 938 inp = sotoinpcb(so); 939 if (inp == 0) { 940 INP_INFO_WUNLOCK(&udbinfo); 941 return EINVAL; 942 } 943 INP_LOCK(inp); 944 if (inp->inp_faddr.s_addr != INADDR_ANY) { 945 INP_UNLOCK(inp); 946 INP_INFO_WUNLOCK(&udbinfo); 947 return EISCONN; 948 } 949 s = splnet(); 950 sin = (struct sockaddr_in *)nam; 951 if (td && jailed(td->td_ucred)) 952 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr); 953 error = in_pcbconnect(inp, nam, td); 954 splx(s); 955 if (error == 0) 956 soisconnected(so); 957 INP_UNLOCK(inp); 958 INP_INFO_WUNLOCK(&udbinfo); 959 return error; 960 } 961 962 static int 963 udp_detach(struct socket *so) 964 { 965 struct inpcb *inp; 966 int s; 967 968 INP_INFO_WLOCK(&udbinfo); 969 inp = sotoinpcb(so); 970 if (inp == 0) { 971 INP_INFO_WUNLOCK(&udbinfo); 972 return EINVAL; 973 } 974 INP_LOCK(inp); 975 s = splnet(); 976 in_pcbdetach(inp); 977 INP_INFO_WUNLOCK(&udbinfo); 978 splx(s); 979 return 0; 980 } 981 982 static int 983 udp_disconnect(struct socket *so) 984 { 985 struct inpcb *inp; 986 int s; 987 988 INP_INFO_WLOCK(&udbinfo); 989 inp = sotoinpcb(so); 990 if (inp == 0) { 991 INP_INFO_WUNLOCK(&udbinfo); 992 return EINVAL; 993 } 994 INP_LOCK(inp); 995 if (inp->inp_faddr.s_addr == INADDR_ANY) { 996 INP_INFO_WUNLOCK(&udbinfo); 997 INP_UNLOCK(inp); 998 return ENOTCONN; 999 } 1000 1001 s = splnet(); 1002 in_pcbdisconnect(inp); 1003 inp->inp_laddr.s_addr = INADDR_ANY; 1004 INP_UNLOCK(inp); 1005 INP_INFO_WUNLOCK(&udbinfo); 1006 splx(s); 1007 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1008 return 0; 1009 } 1010 1011 static int 1012 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 1013 struct mbuf *control, struct thread *td) 1014 { 1015 struct inpcb *inp; 1016 int ret; 1017 1018 INP_INFO_WLOCK(&udbinfo); 1019 inp = sotoinpcb(so); 1020 if (inp == 0) { 1021 INP_INFO_WUNLOCK(&udbinfo); 1022 m_freem(m); 1023 return EINVAL; 1024 } 1025 INP_LOCK(inp); 1026 ret = udp_output(inp, m, addr, control, td); 1027 INP_UNLOCK(inp); 1028 INP_INFO_WUNLOCK(&udbinfo); 1029 return ret; 1030 } 1031 1032 int 1033 udp_shutdown(struct socket *so) 1034 { 1035 struct inpcb *inp; 1036 1037 INP_INFO_RLOCK(&udbinfo); 1038 inp = sotoinpcb(so); 1039 if (inp == 0) { 1040 INP_INFO_RUNLOCK(&udbinfo); 1041 return EINVAL; 1042 } 1043 INP_LOCK(inp); 1044 INP_INFO_RUNLOCK(&udbinfo); 1045 socantsendmore(so); 1046 INP_UNLOCK(inp); 1047 return 0; 1048 } 1049 1050 /* 1051 * This is the wrapper function for in_setsockaddr. We just pass down 1052 * the pcbinfo for in_setsockaddr to lock. We don't want to do the locking 1053 * here because in_setsockaddr will call malloc and might block. 1054 */ 1055 static int 1056 udp_sockaddr(struct socket *so, struct sockaddr **nam) 1057 { 1058 return (in_setsockaddr(so, nam, &udbinfo)); 1059 } 1060 1061 /* 1062 * This is the wrapper function for in_setpeeraddr. We just pass down 1063 * the pcbinfo for in_setpeeraddr to lock. 1064 */ 1065 static int 1066 udp_peeraddr(struct socket *so, struct sockaddr **nam) 1067 { 1068 return (in_setpeeraddr(so, nam, &udbinfo)); 1069 } 1070 1071 struct pr_usrreqs udp_usrreqs = { 1072 udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect, 1073 pru_connect2_notsupp, in_control, udp_detach, udp_disconnect, 1074 pru_listen_notsupp, udp_peeraddr, pru_rcvd_notsupp, 1075 pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown, 1076 udp_sockaddr, sosend, soreceive, sopoll 1077 }; 1078