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 1.8 2003/11/08 07:57:51 dillon 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 static int strict_mcast_mship = 1; 107 SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW, 108 &strict_mcast_mship, 0, "Only send multicast to member sockets"); 109 110 struct inpcbhead udb; /* from udp_var.h */ 111 #define udb6 udb /* for KAME src sync over BSD*'s */ 112 struct inpcbinfo udbinfo; 113 114 #ifndef UDBHASHSIZE 115 #define UDBHASHSIZE 16 116 #endif 117 118 struct udpstat udpstat; /* from udp_var.h */ 119 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW, 120 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); 121 122 static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; 123 #ifdef INET6 124 struct udp_in6 { 125 struct sockaddr_in6 uin6_sin; 126 u_char uin6_init_done : 1; 127 } udp_in6 = { 128 { sizeof(udp_in6.uin6_sin), AF_INET6 }, 129 0 130 }; 131 struct udp_ip6 { 132 struct ip6_hdr uip6_ip6; 133 u_char uip6_init_done : 1; 134 } udp_ip6; 135 #endif /* INET6 */ 136 137 static void udp_append (struct inpcb *last, struct ip *ip, 138 struct mbuf *n, int off); 139 #ifdef INET6 140 static void ip_2_ip6_hdr (struct ip6_hdr *ip6, struct ip *ip); 141 #endif 142 143 static int udp_detach (struct socket *so); 144 static int udp_output (struct inpcb *, struct mbuf *, struct sockaddr *, 145 struct mbuf *, struct thread *); 146 147 void 148 udp_init() 149 { 150 LIST_INIT(&udb); 151 udbinfo.listhead = &udb; 152 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask); 153 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB, 154 &udbinfo.porthashmask); 155 udbinfo.ipi_zone = zinit("udpcb", sizeof(struct inpcb), maxsockets, 156 ZONE_INTERRUPT, 0); 157 udp_thread_init(); 158 } 159 160 /* 161 * Check multicast packets to make sure they are only sent to sockets with 162 * multicast memberships for the packet's destination address and arrival 163 * interface. Multicast packets to multicast-unaware sockets are also 164 * disallowed. 165 * 166 * Returns 0 if the packet is acceptable, -1 if it is not. 167 */ 168 static __inline 169 int 170 check_multicast_membership(struct ip *ip, struct inpcb *inp, struct mbuf *m) 171 { 172 int mshipno; 173 struct ip_moptions *mopt; 174 175 if (strict_mcast_mship == 0 || 176 !IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 177 return(0); 178 } 179 mopt = inp->inp_moptions; 180 if (mopt == NULL) 181 return(-1); 182 for (mshipno = 0; mshipno <= mopt->imo_num_memberships; ++mshipno) { 183 if (ip->ip_dst.s_addr == mopt->imo_membership[mshipno]->inm_addr.s_addr && 184 m->m_pkthdr.rcvif == mopt->imo_membership[mshipno]->inm_ifp) { 185 return(0); 186 } 187 } 188 return(-1); 189 } 190 191 void 192 udp_input(m, off, proto) 193 struct mbuf *m; 194 int off, proto; 195 { 196 int iphlen = off; 197 struct ip *ip; 198 struct udphdr *uh; 199 struct inpcb *inp; 200 struct mbuf *opts = 0; 201 int len; 202 struct ip save_ip; 203 struct sockaddr *append_sa; 204 205 udpstat.udps_ipackets++; 206 207 /* 208 * Strip IP options, if any; should skip this, 209 * make available to user, and use on returned packets, 210 * but we don't yet have a way to check the checksum 211 * with options still present. 212 */ 213 if (iphlen > sizeof (struct ip)) { 214 ip_stripoptions(m, (struct mbuf *)0); 215 iphlen = sizeof(struct ip); 216 } 217 218 /* 219 * Get IP and UDP header together in first mbuf. 220 */ 221 ip = mtod(m, struct ip *); 222 if (m->m_len < iphlen + sizeof(struct udphdr)) { 223 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { 224 udpstat.udps_hdrops++; 225 return; 226 } 227 ip = mtod(m, struct ip *); 228 } 229 uh = (struct udphdr *)((caddr_t)ip + iphlen); 230 231 /* destination port of 0 is illegal, based on RFC768. */ 232 if (uh->uh_dport == 0) 233 goto bad; 234 235 /* 236 * Make mbuf data length reflect UDP length. 237 * If not enough data to reflect UDP length, drop. 238 */ 239 len = ntohs((u_short)uh->uh_ulen); 240 if (ip->ip_len != len) { 241 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 242 udpstat.udps_badlen++; 243 goto bad; 244 } 245 m_adj(m, len - ip->ip_len); 246 /* ip->ip_len = len; */ 247 } 248 /* 249 * Save a copy of the IP header in case we want restore it 250 * for sending an ICMP error message in response. 251 */ 252 save_ip = *ip; 253 254 /* 255 * Checksum extended UDP header and data. 256 */ 257 if (uh->uh_sum) { 258 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 259 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 260 uh->uh_sum = m->m_pkthdr.csum_data; 261 else 262 uh->uh_sum = in_pseudo(ip->ip_src.s_addr, 263 ip->ip_dst.s_addr, htonl((u_short)len + 264 m->m_pkthdr.csum_data + IPPROTO_UDP)); 265 uh->uh_sum ^= 0xffff; 266 } else { 267 char b[9]; 268 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 269 bzero(((struct ipovly *)ip)->ih_x1, 9); 270 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 271 uh->uh_sum = in_cksum(m, len + sizeof (struct ip)); 272 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 273 } 274 if (uh->uh_sum) { 275 udpstat.udps_badsum++; 276 m_freem(m); 277 return; 278 } 279 } else 280 udpstat.udps_nosum++; 281 282 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 283 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { 284 struct inpcb *last; 285 /* 286 * Deliver a multicast or broadcast datagram to *all* sockets 287 * for which the local and remote addresses and ports match 288 * those of the incoming datagram. This allows more than 289 * one process to receive multi/broadcasts on the same port. 290 * (This really ought to be done for unicast datagrams as 291 * well, but that would cause problems with existing 292 * applications that open both address-specific sockets and 293 * a wildcard socket listening to the same port -- they would 294 * end up receiving duplicates of every unicast datagram. 295 * Those applications open the multiple sockets to overcome an 296 * inadequacy of the UDP socket interface, but for backwards 297 * compatibility we avoid the problem here rather than 298 * fixing the interface. Maybe 4.5BSD will remedy this?) 299 */ 300 301 /* 302 * Construct sockaddr format source address. 303 */ 304 udp_in.sin_port = uh->uh_sport; 305 udp_in.sin_addr = ip->ip_src; 306 /* 307 * Locate pcb(s) for datagram. 308 * (Algorithm copied from raw_intr().) 309 */ 310 last = NULL; 311 #ifdef INET6 312 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0; 313 #endif 314 LIST_FOREACH(inp, &udb, inp_list) { 315 #ifdef INET6 316 if ((inp->inp_vflag & INP_IPV4) == 0) 317 continue; 318 #endif 319 if (inp->inp_lport != uh->uh_dport) 320 continue; 321 if (inp->inp_laddr.s_addr != INADDR_ANY) { 322 if (inp->inp_laddr.s_addr != 323 ip->ip_dst.s_addr) 324 continue; 325 } 326 if (inp->inp_faddr.s_addr != INADDR_ANY) { 327 if (inp->inp_faddr.s_addr != 328 ip->ip_src.s_addr || 329 inp->inp_fport != uh->uh_sport) 330 continue; 331 } 332 333 if (check_multicast_membership(ip, inp, m) < 0) 334 continue; 335 336 if (last != NULL) { 337 struct mbuf *n; 338 339 #ifdef IPSEC 340 /* check AH/ESP integrity. */ 341 if (ipsec4_in_reject_so(m, last->inp_socket)) 342 ipsecstat.in_polvio++; 343 /* do not inject data to pcb */ 344 else 345 #endif /*IPSEC*/ 346 #ifdef FAST_IPSEC 347 /* check AH/ESP integrity. */ 348 if (ipsec4_in_reject(m, last)) 349 ; 350 else 351 #endif /*FAST_IPSEC*/ 352 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 353 udp_append(last, ip, n, 354 iphlen + 355 sizeof(struct udphdr)); 356 } 357 last = inp; 358 /* 359 * Don't look for additional matches if this one does 360 * not have either the SO_REUSEPORT or SO_REUSEADDR 361 * socket options set. This heuristic avoids searching 362 * through all pcbs in the common case of a non-shared 363 * port. It * assumes that an application will never 364 * clear these options after setting them. 365 */ 366 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0) 367 break; 368 } 369 370 if (last == NULL) { 371 /* 372 * No matching pcb found; discard datagram. 373 * (No need to send an ICMP Port Unreachable 374 * for a broadcast or multicast datgram.) 375 */ 376 udpstat.udps_noportbcast++; 377 goto bad; 378 } 379 #ifdef IPSEC 380 /* check AH/ESP integrity. */ 381 if (ipsec4_in_reject_so(m, last->inp_socket)) { 382 ipsecstat.in_polvio++; 383 goto bad; 384 } 385 #endif /*IPSEC*/ 386 #ifdef FAST_IPSEC 387 /* check AH/ESP integrity. */ 388 if (ipsec4_in_reject(m, last)) 389 goto bad; 390 #endif /*FAST_IPSEC*/ 391 udp_append(last, ip, m, iphlen + sizeof(struct udphdr)); 392 return; 393 } 394 /* 395 * Locate pcb for datagram. 396 */ 397 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, 398 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 399 if (inp == NULL) { 400 if (log_in_vain) { 401 char buf[4*sizeof "123"]; 402 403 strcpy(buf, inet_ntoa(ip->ip_dst)); 404 log(LOG_INFO, 405 "Connection attempt to UDP %s:%d from %s:%d\n", 406 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 407 ntohs(uh->uh_sport)); 408 } 409 udpstat.udps_noport++; 410 if (m->m_flags & (M_BCAST | M_MCAST)) { 411 udpstat.udps_noportbcast++; 412 goto bad; 413 } 414 if (blackhole) 415 goto bad; 416 #ifdef ICMP_BANDLIM 417 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 418 goto bad; 419 #endif 420 *ip = save_ip; 421 ip->ip_len += iphlen; 422 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 423 return; 424 } 425 #ifdef IPSEC 426 if (ipsec4_in_reject_so(m, inp->inp_socket)) { 427 ipsecstat.in_polvio++; 428 goto bad; 429 } 430 #endif /*IPSEC*/ 431 #ifdef FAST_IPSEC 432 if (ipsec4_in_reject(m, inp)) 433 goto bad; 434 #endif /*FAST_IPSEC*/ 435 436 /* 437 * Construct sockaddr format source address. 438 * Stuff source address and datagram in user buffer. 439 */ 440 udp_in.sin_port = uh->uh_sport; 441 udp_in.sin_addr = ip->ip_src; 442 if (inp->inp_flags & INP_CONTROLOPTS 443 || inp->inp_socket->so_options & SO_TIMESTAMP) { 444 #ifdef INET6 445 if (inp->inp_vflag & INP_IPV6) { 446 int savedflags; 447 448 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 449 savedflags = inp->inp_flags; 450 inp->inp_flags &= ~INP_UNMAPPABLEOPTS; 451 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m); 452 inp->inp_flags = savedflags; 453 } else 454 #endif 455 ip_savecontrol(inp, &opts, ip, m); 456 } 457 m_adj(m, iphlen + sizeof(struct udphdr)); 458 #ifdef INET6 459 if (inp->inp_vflag & INP_IPV6) { 460 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 461 append_sa = (struct sockaddr *)&udp_in6; 462 } else 463 #endif 464 append_sa = (struct sockaddr *)&udp_in; 465 if (sbappendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) { 466 udpstat.udps_fullsock++; 467 goto bad; 468 } 469 sorwakeup(inp->inp_socket); 470 return; 471 bad: 472 m_freem(m); 473 if (opts) 474 m_freem(opts); 475 return; 476 } 477 478 #ifdef INET6 479 static void 480 ip_2_ip6_hdr(ip6, ip) 481 struct ip6_hdr *ip6; 482 struct ip *ip; 483 { 484 bzero(ip6, sizeof(*ip6)); 485 486 ip6->ip6_vfc = IPV6_VERSION; 487 ip6->ip6_plen = ip->ip_len; 488 ip6->ip6_nxt = ip->ip_p; 489 ip6->ip6_hlim = ip->ip_ttl; 490 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] = 491 IPV6_ADDR_INT32_SMP; 492 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr; 493 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr; 494 } 495 #endif 496 497 /* 498 * subroutine of udp_input(), mainly for source code readability. 499 * caller must properly init udp_ip6 and udp_in6 beforehand. 500 */ 501 static void 502 udp_append(last, ip, n, off) 503 struct inpcb *last; 504 struct ip *ip; 505 struct mbuf *n; 506 int off; 507 { 508 struct sockaddr *append_sa; 509 struct mbuf *opts = 0; 510 511 if (last->inp_flags & INP_CONTROLOPTS || 512 last->inp_socket->so_options & SO_TIMESTAMP) { 513 #ifdef INET6 514 if (last->inp_vflag & INP_IPV6) { 515 int savedflags; 516 517 if (udp_ip6.uip6_init_done == 0) { 518 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 519 udp_ip6.uip6_init_done = 1; 520 } 521 savedflags = last->inp_flags; 522 last->inp_flags &= ~INP_UNMAPPABLEOPTS; 523 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n); 524 last->inp_flags = savedflags; 525 } else 526 #endif 527 ip_savecontrol(last, &opts, ip, n); 528 } 529 #ifdef INET6 530 if (last->inp_vflag & INP_IPV6) { 531 if (udp_in6.uin6_init_done == 0) { 532 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 533 udp_in6.uin6_init_done = 1; 534 } 535 append_sa = (struct sockaddr *)&udp_in6.uin6_sin; 536 } else 537 #endif 538 append_sa = (struct sockaddr *)&udp_in; 539 m_adj(n, off); 540 if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) { 541 m_freem(n); 542 if (opts) 543 m_freem(opts); 544 udpstat.udps_fullsock++; 545 } else 546 sorwakeup(last->inp_socket); 547 } 548 549 /* 550 * Notify a udp user of an asynchronous error; 551 * just wake up so that he can collect error status. 552 */ 553 void 554 udp_notify(inp, errno) 555 struct inpcb *inp; 556 int errno; 557 { 558 inp->inp_socket->so_error = errno; 559 sorwakeup(inp->inp_socket); 560 sowwakeup(inp->inp_socket); 561 } 562 563 void 564 udp_ctlinput(cmd, sa, vip) 565 int cmd; 566 struct sockaddr *sa; 567 void *vip; 568 { 569 struct ip *ip = vip; 570 struct udphdr *uh; 571 void (*notify) (struct inpcb *, int) = udp_notify; 572 struct in_addr faddr; 573 struct inpcb *inp; 574 int s; 575 576 faddr = ((struct sockaddr_in *)sa)->sin_addr; 577 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 578 return; 579 580 if (PRC_IS_REDIRECT(cmd)) { 581 ip = 0; 582 notify = in_rtchange; 583 } else if (cmd == PRC_HOSTDEAD) 584 ip = 0; 585 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 586 return; 587 if (ip) { 588 s = splnet(); 589 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 590 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport, 591 ip->ip_src, uh->uh_sport, 0, NULL); 592 if (inp != NULL && inp->inp_socket != NULL) 593 (*notify)(inp, inetctlerrmap[cmd]); 594 splx(s); 595 } else 596 in_pcbnotifyall(&udb, faddr, inetctlerrmap[cmd], notify); 597 } 598 599 static int 600 udp_pcblist(SYSCTL_HANDLER_ARGS) 601 { 602 int error, i, n, s; 603 struct inpcb *inp, **inp_list; 604 inp_gen_t gencnt; 605 struct xinpgen xig; 606 607 /* 608 * The process of preparing the TCB list is too time-consuming and 609 * resource-intensive to repeat twice on every request. 610 */ 611 if (req->oldptr == 0) { 612 n = udbinfo.ipi_count; 613 req->oldidx = 2 * (sizeof xig) 614 + (n + n/8) * sizeof(struct xinpcb); 615 return 0; 616 } 617 618 if (req->newptr != 0) 619 return EPERM; 620 621 /* 622 * OK, now we're committed to doing something. 623 */ 624 s = splnet(); 625 gencnt = udbinfo.ipi_gencnt; 626 n = udbinfo.ipi_count; 627 splx(s); 628 629 xig.xig_len = sizeof xig; 630 xig.xig_count = n; 631 xig.xig_gen = gencnt; 632 xig.xig_sogen = so_gencnt; 633 error = SYSCTL_OUT(req, &xig, sizeof xig); 634 if (error) 635 return error; 636 637 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 638 if (inp_list == 0) 639 return ENOMEM; 640 641 s = splnet(); 642 for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n; 643 inp = LIST_NEXT(inp, inp_list)) { 644 if (inp->inp_gencnt <= gencnt && !prison_xinpcb(req->td, inp)) 645 inp_list[i++] = inp; 646 } 647 splx(s); 648 n = i; 649 650 error = 0; 651 for (i = 0; i < n; i++) { 652 inp = inp_list[i]; 653 if (inp->inp_gencnt <= gencnt) { 654 struct xinpcb xi; 655 xi.xi_len = sizeof xi; 656 /* XXX should avoid extra copy */ 657 bcopy(inp, &xi.xi_inp, sizeof *inp); 658 if (inp->inp_socket) 659 sotoxsocket(inp->inp_socket, &xi.xi_socket); 660 error = SYSCTL_OUT(req, &xi, sizeof xi); 661 } 662 } 663 if (!error) { 664 /* 665 * Give the user an updated idea of our state. 666 * If the generation differs from what we told 667 * her before, she knows that something happened 668 * while we were processing this request, and it 669 * might be necessary to retry. 670 */ 671 s = splnet(); 672 xig.xig_gen = udbinfo.ipi_gencnt; 673 xig.xig_sogen = so_gencnt; 674 xig.xig_count = udbinfo.ipi_count; 675 splx(s); 676 error = SYSCTL_OUT(req, &xig, sizeof xig); 677 } 678 free(inp_list, M_TEMP); 679 return error; 680 } 681 682 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 683 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 684 685 static int 686 udp_getcred(SYSCTL_HANDLER_ARGS) 687 { 688 struct sockaddr_in addrs[2]; 689 struct inpcb *inp; 690 int error, s; 691 692 error = suser(req->td); 693 if (error) 694 return (error); 695 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 696 if (error) 697 return (error); 698 s = splnet(); 699 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 700 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 701 if (inp == NULL || inp->inp_socket == NULL) { 702 error = ENOENT; 703 goto out; 704 } 705 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(struct ucred)); 706 out: 707 splx(s); 708 return (error); 709 } 710 711 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 712 0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection"); 713 714 static int 715 udp_output(inp, m, addr, control, td) 716 struct inpcb *inp; 717 struct mbuf *m; 718 struct sockaddr *addr; 719 struct mbuf *control; 720 struct thread *td; 721 { 722 struct udpiphdr *ui; 723 int len = m->m_pkthdr.len; 724 struct in_addr laddr; 725 struct sockaddr_in *sin; 726 int s = 0, error = 0; 727 728 if (control) 729 m_freem(control); /* XXX */ 730 731 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 732 error = EMSGSIZE; 733 goto release; 734 } 735 736 if (addr) { 737 sin = (struct sockaddr_in *)addr; 738 prison_remote_ip(td, 0, &sin->sin_addr.s_addr); 739 laddr = inp->inp_laddr; 740 if (inp->inp_faddr.s_addr != INADDR_ANY) { 741 error = EISCONN; 742 goto release; 743 } 744 /* 745 * Must block input while temporarily connected. 746 */ 747 s = splnet(); 748 error = in_pcbconnect(inp, addr, td); 749 if (error) { 750 splx(s); 751 goto release; 752 } 753 } else { 754 if (inp->inp_faddr.s_addr == INADDR_ANY) { 755 error = ENOTCONN; 756 goto release; 757 } 758 } 759 /* 760 * Calculate data length and get a mbuf 761 * for UDP and IP headers. 762 */ 763 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 764 if (m == 0) { 765 error = ENOBUFS; 766 if (addr) 767 splx(s); 768 goto release; 769 } 770 771 /* 772 * Fill in mbuf with extended UDP header 773 * and addresses and length put into network format. 774 */ 775 ui = mtod(m, struct udpiphdr *); 776 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ 777 ui->ui_pr = IPPROTO_UDP; 778 ui->ui_src = inp->inp_laddr; 779 ui->ui_dst = inp->inp_faddr; 780 ui->ui_sport = inp->inp_lport; 781 ui->ui_dport = inp->inp_fport; 782 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 783 784 /* 785 * Set up checksum and output datagram. 786 */ 787 if (udpcksum) { 788 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr, 789 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 790 m->m_pkthdr.csum_flags = CSUM_UDP; 791 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 792 } else { 793 ui->ui_sum = 0; 794 } 795 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 796 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 797 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 798 udpstat.udps_opackets++; 799 800 error = ip_output(m, inp->inp_options, &inp->inp_route, 801 (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)), 802 inp->inp_moptions, inp); 803 804 if (addr) { 805 in_pcbdisconnect(inp); 806 inp->inp_laddr = laddr; /* XXX rehash? */ 807 splx(s); 808 } 809 return (error); 810 811 release: 812 m_freem(m); 813 return (error); 814 } 815 816 u_long udp_sendspace = 9216; /* really max datagram size */ 817 /* 40 1K datagrams */ 818 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 819 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 820 821 u_long udp_recvspace = 40 * (1024 + 822 #ifdef INET6 823 sizeof(struct sockaddr_in6) 824 #else 825 sizeof(struct sockaddr_in) 826 #endif 827 ); 828 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 829 &udp_recvspace, 0, "Maximum incoming UDP datagram size"); 830 831 static int 832 udp_abort(struct socket *so) 833 { 834 struct inpcb *inp; 835 int s; 836 837 inp = sotoinpcb(so); 838 if (inp == 0) 839 return EINVAL; /* ??? possible? panic instead? */ 840 soisdisconnected(so); 841 s = splnet(); 842 in_pcbdetach(inp); 843 splx(s); 844 return 0; 845 } 846 847 static int 848 udp_attach(struct socket *so, int proto, struct thread *td) 849 { 850 struct inpcb *inp; 851 int s, error; 852 853 inp = sotoinpcb(so); 854 if (inp != 0) 855 return EINVAL; 856 857 error = soreserve(so, udp_sendspace, udp_recvspace); 858 if (error) 859 return error; 860 s = splnet(); 861 error = in_pcballoc(so, &udbinfo, td); 862 splx(s); 863 if (error) 864 return error; 865 866 inp = (struct inpcb *)so->so_pcb; 867 inp->inp_vflag |= INP_IPV4; 868 inp->inp_ip_ttl = ip_defttl; 869 return 0; 870 } 871 872 static int 873 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 874 { 875 struct inpcb *inp; 876 int s, error; 877 878 inp = sotoinpcb(so); 879 if (inp == 0) 880 return EINVAL; 881 s = splnet(); 882 error = in_pcbbind(inp, nam, td); 883 splx(s); 884 return error; 885 } 886 887 static int 888 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 889 { 890 struct inpcb *inp; 891 int s, error; 892 struct sockaddr_in *sin; 893 894 inp = sotoinpcb(so); 895 if (inp == 0) 896 return EINVAL; 897 if (inp->inp_faddr.s_addr != INADDR_ANY) 898 return EISCONN; 899 error = 0; 900 s = splnet(); 901 if (inp->inp_laddr.s_addr == INADDR_ANY && 902 td->td_proc && 903 td->td_proc->p_ucred->cr_prison != NULL) { 904 error = in_pcbbind(inp, NULL, td); 905 } 906 if (error == 0) { 907 sin = (struct sockaddr_in *)nam; 908 prison_remote_ip(td, 0, &sin->sin_addr.s_addr); 909 error = in_pcbconnect(inp, nam, td); 910 } 911 splx(s); 912 if (error == 0) 913 soisconnected(so); 914 return error; 915 } 916 917 static int 918 udp_detach(struct socket *so) 919 { 920 struct inpcb *inp; 921 int s; 922 923 inp = sotoinpcb(so); 924 if (inp == 0) 925 return EINVAL; 926 s = splnet(); 927 in_pcbdetach(inp); 928 splx(s); 929 return 0; 930 } 931 932 static int 933 udp_disconnect(struct socket *so) 934 { 935 struct inpcb *inp; 936 int s; 937 938 inp = sotoinpcb(so); 939 if (inp == 0) 940 return EINVAL; 941 if (inp->inp_faddr.s_addr == INADDR_ANY) 942 return ENOTCONN; 943 944 s = splnet(); 945 in_pcbdisconnect(inp); 946 inp->inp_laddr.s_addr = INADDR_ANY; 947 splx(s); 948 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 949 return 0; 950 } 951 952 static int 953 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 954 struct mbuf *control, struct thread *td) 955 { 956 struct inpcb *inp; 957 958 inp = sotoinpcb(so); 959 if (inp == 0) { 960 m_freem(m); 961 return EINVAL; 962 } 963 return udp_output(inp, m, addr, control, td); 964 } 965 966 int 967 udp_shutdown(struct socket *so) 968 { 969 struct inpcb *inp; 970 971 inp = sotoinpcb(so); 972 if (inp == 0) 973 return EINVAL; 974 socantsendmore(so); 975 return 0; 976 } 977 978 struct pr_usrreqs udp_usrreqs = { 979 udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect, 980 pru_connect2_notsupp, in_control, udp_detach, udp_disconnect, 981 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp, 982 pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown, 983 in_setsockaddr, sosend, soreceive, sopoll 984 }; 985 986