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: src/sys/netinet/udp_usrreq.c,v 1.64.2.18 2003/01/24 05:11:34 sam Exp $ 35 * $DragonFly: src/sys/netinet/udp_usrreq.c,v 1.6 2003/08/23 11:18:00 rob Exp $ 36 */ 37 38 #include "opt_ipsec.h" 39 #include "opt_inet6.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/malloc.h> 45 #include <sys/mbuf.h> 46 #include <sys/domain.h> 47 #include <sys/proc.h> 48 #include <sys/protosw.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/sysctl.h> 52 #include <sys/syslog.h> 53 54 #include <vm/vm_zone.h> 55 56 #include <net/if.h> 57 #include <net/route.h> 58 59 #include <netinet/in.h> 60 #include <netinet/in_systm.h> 61 #include <netinet/ip.h> 62 #ifdef INET6 63 #include <netinet/ip6.h> 64 #endif 65 #include <netinet/in_pcb.h> 66 #include <netinet/in_var.h> 67 #include <netinet/ip_var.h> 68 #ifdef INET6 69 #include <netinet6/ip6_var.h> 70 #endif 71 #include <netinet/ip_icmp.h> 72 #include <netinet/icmp_var.h> 73 #include <netinet/udp.h> 74 #include <netinet/udp_var.h> 75 76 #ifdef FAST_IPSEC 77 #include <netipsec/ipsec.h> 78 #endif /*FAST_IPSEC*/ 79 80 #ifdef IPSEC 81 #include <netinet6/ipsec.h> 82 #endif /*IPSEC*/ 83 84 #include <machine/in_cksum.h> 85 86 /* 87 * UDP protocol implementation. 88 * Per RFC 768, August, 1980. 89 */ 90 #ifndef COMPAT_42 91 static int udpcksum = 1; 92 #else 93 static int udpcksum = 0; /* XXX */ 94 #endif 95 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, 96 &udpcksum, 0, ""); 97 98 int log_in_vain = 0; 99 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 100 &log_in_vain, 0, "Log all incoming UDP packets"); 101 102 static int blackhole = 0; 103 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, 104 &blackhole, 0, "Do not send port unreachables for refused connects"); 105 106 struct inpcbhead udb; /* from udp_var.h */ 107 #define udb6 udb /* for KAME src sync over BSD*'s */ 108 struct inpcbinfo udbinfo; 109 110 #ifndef UDBHASHSIZE 111 #define UDBHASHSIZE 16 112 #endif 113 114 struct udpstat udpstat; /* from udp_var.h */ 115 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW, 116 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); 117 118 static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; 119 #ifdef INET6 120 struct udp_in6 { 121 struct sockaddr_in6 uin6_sin; 122 u_char uin6_init_done : 1; 123 } udp_in6 = { 124 { sizeof(udp_in6.uin6_sin), AF_INET6 }, 125 0 126 }; 127 struct udp_ip6 { 128 struct ip6_hdr uip6_ip6; 129 u_char uip6_init_done : 1; 130 } udp_ip6; 131 #endif /* INET6 */ 132 133 static void udp_append (struct inpcb *last, struct ip *ip, 134 struct mbuf *n, int off); 135 #ifdef INET6 136 static void ip_2_ip6_hdr (struct ip6_hdr *ip6, struct ip *ip); 137 #endif 138 139 static int udp_detach (struct socket *so); 140 static int udp_output (struct inpcb *, struct mbuf *, struct sockaddr *, 141 struct mbuf *, struct thread *); 142 143 void 144 udp_init() 145 { 146 LIST_INIT(&udb); 147 udbinfo.listhead = &udb; 148 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask); 149 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB, 150 &udbinfo.porthashmask); 151 udbinfo.ipi_zone = zinit("udpcb", sizeof(struct inpcb), maxsockets, 152 ZONE_INTERRUPT, 0); 153 } 154 155 void 156 udp_input(m, off, proto) 157 struct mbuf *m; 158 int off, proto; 159 { 160 int iphlen = off; 161 struct ip *ip; 162 struct udphdr *uh; 163 struct inpcb *inp; 164 struct mbuf *opts = 0; 165 int len; 166 struct ip save_ip; 167 struct sockaddr *append_sa; 168 169 udpstat.udps_ipackets++; 170 171 /* 172 * Strip IP options, if any; should skip this, 173 * make available to user, and use on returned packets, 174 * but we don't yet have a way to check the checksum 175 * with options still present. 176 */ 177 if (iphlen > sizeof (struct ip)) { 178 ip_stripoptions(m, (struct mbuf *)0); 179 iphlen = sizeof(struct ip); 180 } 181 182 /* 183 * Get IP and UDP header together in first mbuf. 184 */ 185 ip = mtod(m, struct ip *); 186 if (m->m_len < iphlen + sizeof(struct udphdr)) { 187 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { 188 udpstat.udps_hdrops++; 189 return; 190 } 191 ip = mtod(m, struct ip *); 192 } 193 uh = (struct udphdr *)((caddr_t)ip + iphlen); 194 195 /* destination port of 0 is illegal, based on RFC768. */ 196 if (uh->uh_dport == 0) 197 goto bad; 198 199 /* 200 * Make mbuf data length reflect UDP length. 201 * If not enough data to reflect UDP length, drop. 202 */ 203 len = ntohs((u_short)uh->uh_ulen); 204 if (ip->ip_len != len) { 205 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 206 udpstat.udps_badlen++; 207 goto bad; 208 } 209 m_adj(m, len - ip->ip_len); 210 /* ip->ip_len = len; */ 211 } 212 /* 213 * Save a copy of the IP header in case we want restore it 214 * for sending an ICMP error message in response. 215 */ 216 save_ip = *ip; 217 218 /* 219 * Checksum extended UDP header and data. 220 */ 221 if (uh->uh_sum) { 222 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 223 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 224 uh->uh_sum = m->m_pkthdr.csum_data; 225 else 226 uh->uh_sum = in_pseudo(ip->ip_src.s_addr, 227 ip->ip_dst.s_addr, htonl((u_short)len + 228 m->m_pkthdr.csum_data + IPPROTO_UDP)); 229 uh->uh_sum ^= 0xffff; 230 } else { 231 char b[9]; 232 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 233 bzero(((struct ipovly *)ip)->ih_x1, 9); 234 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 235 uh->uh_sum = in_cksum(m, len + sizeof (struct ip)); 236 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 237 } 238 if (uh->uh_sum) { 239 udpstat.udps_badsum++; 240 m_freem(m); 241 return; 242 } 243 } else 244 udpstat.udps_nosum++; 245 246 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 247 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { 248 struct inpcb *last; 249 /* 250 * Deliver a multicast or broadcast datagram to *all* sockets 251 * for which the local and remote addresses and ports match 252 * those of the incoming datagram. This allows more than 253 * one process to receive multi/broadcasts on the same port. 254 * (This really ought to be done for unicast datagrams as 255 * well, but that would cause problems with existing 256 * applications that open both address-specific sockets and 257 * a wildcard socket listening to the same port -- they would 258 * end up receiving duplicates of every unicast datagram. 259 * Those applications open the multiple sockets to overcome an 260 * inadequacy of the UDP socket interface, but for backwards 261 * compatibility we avoid the problem here rather than 262 * fixing the interface. Maybe 4.5BSD will remedy this?) 263 */ 264 265 /* 266 * Construct sockaddr format source address. 267 */ 268 udp_in.sin_port = uh->uh_sport; 269 udp_in.sin_addr = ip->ip_src; 270 /* 271 * Locate pcb(s) for datagram. 272 * (Algorithm copied from raw_intr().) 273 */ 274 last = NULL; 275 #ifdef INET6 276 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0; 277 #endif 278 LIST_FOREACH(inp, &udb, inp_list) { 279 #ifdef INET6 280 if ((inp->inp_vflag & INP_IPV4) == 0) 281 continue; 282 #endif 283 if (inp->inp_lport != uh->uh_dport) 284 continue; 285 if (inp->inp_laddr.s_addr != INADDR_ANY) { 286 if (inp->inp_laddr.s_addr != 287 ip->ip_dst.s_addr) 288 continue; 289 } 290 if (inp->inp_faddr.s_addr != INADDR_ANY) { 291 if (inp->inp_faddr.s_addr != 292 ip->ip_src.s_addr || 293 inp->inp_fport != uh->uh_sport) 294 continue; 295 } 296 297 if (last != NULL) { 298 struct mbuf *n; 299 300 #ifdef IPSEC 301 /* check AH/ESP integrity. */ 302 if (ipsec4_in_reject_so(m, last->inp_socket)) 303 ipsecstat.in_polvio++; 304 /* do not inject data to pcb */ 305 else 306 #endif /*IPSEC*/ 307 #ifdef FAST_IPSEC 308 /* check AH/ESP integrity. */ 309 if (ipsec4_in_reject(m, last)) 310 ; 311 else 312 #endif /*FAST_IPSEC*/ 313 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 314 udp_append(last, ip, n, 315 iphlen + 316 sizeof(struct udphdr)); 317 } 318 last = inp; 319 /* 320 * Don't look for additional matches if this one does 321 * not have either the SO_REUSEPORT or SO_REUSEADDR 322 * socket options set. This heuristic avoids searching 323 * through all pcbs in the common case of a non-shared 324 * port. It * assumes that an application will never 325 * clear these options after setting them. 326 */ 327 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0) 328 break; 329 } 330 331 if (last == NULL) { 332 /* 333 * No matching pcb found; discard datagram. 334 * (No need to send an ICMP Port Unreachable 335 * for a broadcast or multicast datgram.) 336 */ 337 udpstat.udps_noportbcast++; 338 goto bad; 339 } 340 #ifdef IPSEC 341 /* check AH/ESP integrity. */ 342 if (ipsec4_in_reject_so(m, last->inp_socket)) { 343 ipsecstat.in_polvio++; 344 goto bad; 345 } 346 #endif /*IPSEC*/ 347 #ifdef FAST_IPSEC 348 /* check AH/ESP integrity. */ 349 if (ipsec4_in_reject(m, last)) 350 goto bad; 351 #endif /*FAST_IPSEC*/ 352 udp_append(last, ip, m, iphlen + sizeof(struct udphdr)); 353 return; 354 } 355 /* 356 * Locate pcb for datagram. 357 */ 358 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, 359 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 360 if (inp == NULL) { 361 if (log_in_vain) { 362 char buf[4*sizeof "123"]; 363 364 strcpy(buf, inet_ntoa(ip->ip_dst)); 365 log(LOG_INFO, 366 "Connection attempt to UDP %s:%d from %s:%d\n", 367 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 368 ntohs(uh->uh_sport)); 369 } 370 udpstat.udps_noport++; 371 if (m->m_flags & (M_BCAST | M_MCAST)) { 372 udpstat.udps_noportbcast++; 373 goto bad; 374 } 375 if (blackhole) 376 goto bad; 377 #ifdef ICMP_BANDLIM 378 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 379 goto bad; 380 #endif 381 *ip = save_ip; 382 ip->ip_len += iphlen; 383 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 384 return; 385 } 386 #ifdef IPSEC 387 if (ipsec4_in_reject_so(m, inp->inp_socket)) { 388 ipsecstat.in_polvio++; 389 goto bad; 390 } 391 #endif /*IPSEC*/ 392 #ifdef FAST_IPSEC 393 if (ipsec4_in_reject(m, inp)) 394 goto bad; 395 #endif /*FAST_IPSEC*/ 396 397 /* 398 * Construct sockaddr format source address. 399 * Stuff source address and datagram in user buffer. 400 */ 401 udp_in.sin_port = uh->uh_sport; 402 udp_in.sin_addr = ip->ip_src; 403 if (inp->inp_flags & INP_CONTROLOPTS 404 || inp->inp_socket->so_options & SO_TIMESTAMP) { 405 #ifdef INET6 406 if (inp->inp_vflag & INP_IPV6) { 407 int savedflags; 408 409 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 410 savedflags = inp->inp_flags; 411 inp->inp_flags &= ~INP_UNMAPPABLEOPTS; 412 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m); 413 inp->inp_flags = savedflags; 414 } else 415 #endif 416 ip_savecontrol(inp, &opts, ip, m); 417 } 418 m_adj(m, iphlen + sizeof(struct udphdr)); 419 #ifdef INET6 420 if (inp->inp_vflag & INP_IPV6) { 421 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 422 append_sa = (struct sockaddr *)&udp_in6; 423 } else 424 #endif 425 append_sa = (struct sockaddr *)&udp_in; 426 if (sbappendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) { 427 udpstat.udps_fullsock++; 428 goto bad; 429 } 430 sorwakeup(inp->inp_socket); 431 return; 432 bad: 433 m_freem(m); 434 if (opts) 435 m_freem(opts); 436 return; 437 } 438 439 #ifdef INET6 440 static void 441 ip_2_ip6_hdr(ip6, ip) 442 struct ip6_hdr *ip6; 443 struct ip *ip; 444 { 445 bzero(ip6, sizeof(*ip6)); 446 447 ip6->ip6_vfc = IPV6_VERSION; 448 ip6->ip6_plen = ip->ip_len; 449 ip6->ip6_nxt = ip->ip_p; 450 ip6->ip6_hlim = ip->ip_ttl; 451 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] = 452 IPV6_ADDR_INT32_SMP; 453 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr; 454 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr; 455 } 456 #endif 457 458 /* 459 * subroutine of udp_input(), mainly for source code readability. 460 * caller must properly init udp_ip6 and udp_in6 beforehand. 461 */ 462 static void 463 udp_append(last, ip, n, off) 464 struct inpcb *last; 465 struct ip *ip; 466 struct mbuf *n; 467 int off; 468 { 469 struct sockaddr *append_sa; 470 struct mbuf *opts = 0; 471 472 if (last->inp_flags & INP_CONTROLOPTS || 473 last->inp_socket->so_options & SO_TIMESTAMP) { 474 #ifdef INET6 475 if (last->inp_vflag & INP_IPV6) { 476 int savedflags; 477 478 if (udp_ip6.uip6_init_done == 0) { 479 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 480 udp_ip6.uip6_init_done = 1; 481 } 482 savedflags = last->inp_flags; 483 last->inp_flags &= ~INP_UNMAPPABLEOPTS; 484 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n); 485 last->inp_flags = savedflags; 486 } else 487 #endif 488 ip_savecontrol(last, &opts, ip, n); 489 } 490 #ifdef INET6 491 if (last->inp_vflag & INP_IPV6) { 492 if (udp_in6.uin6_init_done == 0) { 493 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 494 udp_in6.uin6_init_done = 1; 495 } 496 append_sa = (struct sockaddr *)&udp_in6.uin6_sin; 497 } else 498 #endif 499 append_sa = (struct sockaddr *)&udp_in; 500 m_adj(n, off); 501 if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) { 502 m_freem(n); 503 if (opts) 504 m_freem(opts); 505 udpstat.udps_fullsock++; 506 } else 507 sorwakeup(last->inp_socket); 508 } 509 510 /* 511 * Notify a udp user of an asynchronous error; 512 * just wake up so that he can collect error status. 513 */ 514 void 515 udp_notify(inp, errno) 516 struct inpcb *inp; 517 int errno; 518 { 519 inp->inp_socket->so_error = errno; 520 sorwakeup(inp->inp_socket); 521 sowwakeup(inp->inp_socket); 522 } 523 524 void 525 udp_ctlinput(cmd, sa, vip) 526 int cmd; 527 struct sockaddr *sa; 528 void *vip; 529 { 530 struct ip *ip = vip; 531 struct udphdr *uh; 532 void (*notify) (struct inpcb *, int) = udp_notify; 533 struct in_addr faddr; 534 struct inpcb *inp; 535 int s; 536 537 faddr = ((struct sockaddr_in *)sa)->sin_addr; 538 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 539 return; 540 541 if (PRC_IS_REDIRECT(cmd)) { 542 ip = 0; 543 notify = in_rtchange; 544 } else if (cmd == PRC_HOSTDEAD) 545 ip = 0; 546 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 547 return; 548 if (ip) { 549 s = splnet(); 550 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 551 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport, 552 ip->ip_src, uh->uh_sport, 0, NULL); 553 if (inp != NULL && inp->inp_socket != NULL) 554 (*notify)(inp, inetctlerrmap[cmd]); 555 splx(s); 556 } else 557 in_pcbnotifyall(&udb, faddr, inetctlerrmap[cmd], notify); 558 } 559 560 static int 561 udp_pcblist(SYSCTL_HANDLER_ARGS) 562 { 563 int error, i, n, s; 564 struct inpcb *inp, **inp_list; 565 inp_gen_t gencnt; 566 struct xinpgen xig; 567 568 /* 569 * The process of preparing the TCB list is too time-consuming and 570 * resource-intensive to repeat twice on every request. 571 */ 572 if (req->oldptr == 0) { 573 n = udbinfo.ipi_count; 574 req->oldidx = 2 * (sizeof xig) 575 + (n + n/8) * sizeof(struct xinpcb); 576 return 0; 577 } 578 579 if (req->newptr != 0) 580 return EPERM; 581 582 /* 583 * OK, now we're committed to doing something. 584 */ 585 s = splnet(); 586 gencnt = udbinfo.ipi_gencnt; 587 n = udbinfo.ipi_count; 588 splx(s); 589 590 xig.xig_len = sizeof xig; 591 xig.xig_count = n; 592 xig.xig_gen = gencnt; 593 xig.xig_sogen = so_gencnt; 594 error = SYSCTL_OUT(req, &xig, sizeof xig); 595 if (error) 596 return error; 597 598 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 599 if (inp_list == 0) 600 return ENOMEM; 601 602 s = splnet(); 603 for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n; 604 inp = LIST_NEXT(inp, inp_list)) { 605 if (inp->inp_gencnt <= gencnt && !prison_xinpcb(req->td, inp)) 606 inp_list[i++] = inp; 607 } 608 splx(s); 609 n = i; 610 611 error = 0; 612 for (i = 0; i < n; i++) { 613 inp = inp_list[i]; 614 if (inp->inp_gencnt <= gencnt) { 615 struct xinpcb xi; 616 xi.xi_len = sizeof xi; 617 /* XXX should avoid extra copy */ 618 bcopy(inp, &xi.xi_inp, sizeof *inp); 619 if (inp->inp_socket) 620 sotoxsocket(inp->inp_socket, &xi.xi_socket); 621 error = SYSCTL_OUT(req, &xi, sizeof xi); 622 } 623 } 624 if (!error) { 625 /* 626 * Give the user an updated idea of our state. 627 * If the generation differs from what we told 628 * her before, she knows that something happened 629 * while we were processing this request, and it 630 * might be necessary to retry. 631 */ 632 s = splnet(); 633 xig.xig_gen = udbinfo.ipi_gencnt; 634 xig.xig_sogen = so_gencnt; 635 xig.xig_count = udbinfo.ipi_count; 636 splx(s); 637 error = SYSCTL_OUT(req, &xig, sizeof xig); 638 } 639 free(inp_list, M_TEMP); 640 return error; 641 } 642 643 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 644 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 645 646 static int 647 udp_getcred(SYSCTL_HANDLER_ARGS) 648 { 649 struct sockaddr_in addrs[2]; 650 struct inpcb *inp; 651 int error, s; 652 653 error = suser(req->td); 654 if (error) 655 return (error); 656 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 657 if (error) 658 return (error); 659 s = splnet(); 660 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 661 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 662 if (inp == NULL || inp->inp_socket == NULL) { 663 error = ENOENT; 664 goto out; 665 } 666 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(struct ucred)); 667 out: 668 splx(s); 669 return (error); 670 } 671 672 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 673 0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection"); 674 675 static int 676 udp_output(inp, m, addr, control, td) 677 struct inpcb *inp; 678 struct mbuf *m; 679 struct sockaddr *addr; 680 struct mbuf *control; 681 struct thread *td; 682 { 683 struct udpiphdr *ui; 684 int len = m->m_pkthdr.len; 685 struct in_addr laddr; 686 struct sockaddr_in *sin; 687 int s = 0, error = 0; 688 689 if (control) 690 m_freem(control); /* XXX */ 691 692 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 693 error = EMSGSIZE; 694 goto release; 695 } 696 697 if (addr) { 698 sin = (struct sockaddr_in *)addr; 699 prison_remote_ip(td, 0, &sin->sin_addr.s_addr); 700 laddr = inp->inp_laddr; 701 if (inp->inp_faddr.s_addr != INADDR_ANY) { 702 error = EISCONN; 703 goto release; 704 } 705 /* 706 * Must block input while temporarily connected. 707 */ 708 s = splnet(); 709 error = in_pcbconnect(inp, addr, td); 710 if (error) { 711 splx(s); 712 goto release; 713 } 714 } else { 715 if (inp->inp_faddr.s_addr == INADDR_ANY) { 716 error = ENOTCONN; 717 goto release; 718 } 719 } 720 /* 721 * Calculate data length and get a mbuf 722 * for UDP and IP headers. 723 */ 724 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 725 if (m == 0) { 726 error = ENOBUFS; 727 if (addr) 728 splx(s); 729 goto release; 730 } 731 732 /* 733 * Fill in mbuf with extended UDP header 734 * and addresses and length put into network format. 735 */ 736 ui = mtod(m, struct udpiphdr *); 737 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ 738 ui->ui_pr = IPPROTO_UDP; 739 ui->ui_src = inp->inp_laddr; 740 ui->ui_dst = inp->inp_faddr; 741 ui->ui_sport = inp->inp_lport; 742 ui->ui_dport = inp->inp_fport; 743 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 744 745 /* 746 * Set up checksum and output datagram. 747 */ 748 if (udpcksum) { 749 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr, 750 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 751 m->m_pkthdr.csum_flags = CSUM_UDP; 752 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 753 } else { 754 ui->ui_sum = 0; 755 } 756 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 757 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 758 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 759 udpstat.udps_opackets++; 760 761 error = ip_output(m, inp->inp_options, &inp->inp_route, 762 (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)), 763 inp->inp_moptions, inp); 764 765 if (addr) { 766 in_pcbdisconnect(inp); 767 inp->inp_laddr = laddr; /* XXX rehash? */ 768 splx(s); 769 } 770 return (error); 771 772 release: 773 m_freem(m); 774 return (error); 775 } 776 777 u_long udp_sendspace = 9216; /* really max datagram size */ 778 /* 40 1K datagrams */ 779 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 780 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 781 782 u_long udp_recvspace = 40 * (1024 + 783 #ifdef INET6 784 sizeof(struct sockaddr_in6) 785 #else 786 sizeof(struct sockaddr_in) 787 #endif 788 ); 789 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 790 &udp_recvspace, 0, "Maximum incoming UDP datagram size"); 791 792 static int 793 udp_abort(struct socket *so) 794 { 795 struct inpcb *inp; 796 int s; 797 798 inp = sotoinpcb(so); 799 if (inp == 0) 800 return EINVAL; /* ??? possible? panic instead? */ 801 soisdisconnected(so); 802 s = splnet(); 803 in_pcbdetach(inp); 804 splx(s); 805 return 0; 806 } 807 808 static int 809 udp_attach(struct socket *so, int proto, struct thread *td) 810 { 811 struct inpcb *inp; 812 int s, error; 813 814 inp = sotoinpcb(so); 815 if (inp != 0) 816 return EINVAL; 817 818 error = soreserve(so, udp_sendspace, udp_recvspace); 819 if (error) 820 return error; 821 s = splnet(); 822 error = in_pcballoc(so, &udbinfo, td); 823 splx(s); 824 if (error) 825 return error; 826 827 inp = (struct inpcb *)so->so_pcb; 828 inp->inp_vflag |= INP_IPV4; 829 inp->inp_ip_ttl = ip_defttl; 830 return 0; 831 } 832 833 static int 834 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 835 { 836 struct inpcb *inp; 837 int s, error; 838 839 inp = sotoinpcb(so); 840 if (inp == 0) 841 return EINVAL; 842 s = splnet(); 843 error = in_pcbbind(inp, nam, td); 844 splx(s); 845 return error; 846 } 847 848 static int 849 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 850 { 851 struct inpcb *inp; 852 int s, error; 853 struct sockaddr_in *sin; 854 855 inp = sotoinpcb(so); 856 if (inp == 0) 857 return EINVAL; 858 if (inp->inp_faddr.s_addr != INADDR_ANY) 859 return EISCONN; 860 error = 0; 861 s = splnet(); 862 if (inp->inp_laddr.s_addr == INADDR_ANY && 863 td->td_proc && 864 td->td_proc->p_ucred->cr_prison != NULL) { 865 error = in_pcbbind(inp, NULL, td); 866 } 867 if (error == 0) { 868 sin = (struct sockaddr_in *)nam; 869 prison_remote_ip(td, 0, &sin->sin_addr.s_addr); 870 error = in_pcbconnect(inp, nam, td); 871 } 872 splx(s); 873 if (error == 0) 874 soisconnected(so); 875 return error; 876 } 877 878 static int 879 udp_detach(struct socket *so) 880 { 881 struct inpcb *inp; 882 int s; 883 884 inp = sotoinpcb(so); 885 if (inp == 0) 886 return EINVAL; 887 s = splnet(); 888 in_pcbdetach(inp); 889 splx(s); 890 return 0; 891 } 892 893 static int 894 udp_disconnect(struct socket *so) 895 { 896 struct inpcb *inp; 897 int s; 898 899 inp = sotoinpcb(so); 900 if (inp == 0) 901 return EINVAL; 902 if (inp->inp_faddr.s_addr == INADDR_ANY) 903 return ENOTCONN; 904 905 s = splnet(); 906 in_pcbdisconnect(inp); 907 inp->inp_laddr.s_addr = INADDR_ANY; 908 splx(s); 909 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 910 return 0; 911 } 912 913 static int 914 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 915 struct mbuf *control, struct thread *td) 916 { 917 struct inpcb *inp; 918 919 inp = sotoinpcb(so); 920 if (inp == 0) { 921 m_freem(m); 922 return EINVAL; 923 } 924 return udp_output(inp, m, addr, control, td); 925 } 926 927 int 928 udp_shutdown(struct socket *so) 929 { 930 struct inpcb *inp; 931 932 inp = sotoinpcb(so); 933 if (inp == 0) 934 return EINVAL; 935 socantsendmore(so); 936 return 0; 937 } 938 939 struct pr_usrreqs udp_usrreqs = { 940 udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect, 941 pru_connect2_notsupp, in_control, udp_detach, udp_disconnect, 942 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp, 943 pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown, 944 in_setsockaddr, sosend, soreceive, sopoll 945 }; 946 947