1 /* 2 * Copyright (c) 2004 Jeffrey M. Hsu. All rights reserved. 3 * Copyright (c) 2004 The DragonFly Project. All rights reserved. 4 * 5 * This code is derived from software contributed to The DragonFly Project 6 * by Jeffrey M. Hsu. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of The DragonFly Project nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific, prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Copyright (c) 2004 Jeffrey M. Hsu. All rights reserved. 36 * 37 * License terms: all terms for the DragonFly license above plus the following: 38 * 39 * 4. All advertising materials mentioning features or use of this software 40 * must display the following acknowledgement: 41 * 42 * This product includes software developed by Jeffrey M. Hsu 43 * for the DragonFly Project. 44 * 45 * This requirement may be waived with permission from Jeffrey Hsu. 46 * This requirement will sunset and may be removed on July 8 2005, 47 * after which the standard DragonFly license (as shown above) will 48 * apply. 49 */ 50 51 /* 52 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 53 * The Regents of the University of California. All rights reserved. 54 * 55 * Redistribution and use in source and binary forms, with or without 56 * modification, are permitted provided that the following conditions 57 * are met: 58 * 1. Redistributions of source code must retain the above copyright 59 * notice, this list of conditions and the following disclaimer. 60 * 2. Redistributions in binary form must reproduce the above copyright 61 * notice, this list of conditions and the following disclaimer in the 62 * documentation and/or other materials provided with the distribution. 63 * 3. All advertising materials mentioning features or use of this software 64 * must display the following acknowledgement: 65 * This product includes software developed by the University of 66 * California, Berkeley and its contributors. 67 * 4. Neither the name of the University nor the names of its contributors 68 * may be used to endorse or promote products derived from this software 69 * without specific prior written permission. 70 * 71 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 72 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 73 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 74 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 75 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 76 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 77 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 78 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 79 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 80 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 81 * SUCH DAMAGE. 82 * 83 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 84 * $FreeBSD: src/sys/netinet/udp_usrreq.c,v 1.64.2.18 2003/01/24 05:11:34 sam Exp $ 85 * $DragonFly: src/sys/netinet/udp_usrreq.c,v 1.32 2005/01/06 09:14:13 hsu Exp $ 86 */ 87 88 #include "opt_ipsec.h" 89 #include "opt_inet6.h" 90 91 #include <sys/param.h> 92 #include <sys/systm.h> 93 #include <sys/kernel.h> 94 #include <sys/malloc.h> 95 #include <sys/mbuf.h> 96 #include <sys/domain.h> 97 #include <sys/proc.h> 98 #include <sys/protosw.h> 99 #include <sys/socket.h> 100 #include <sys/socketvar.h> 101 #include <sys/sysctl.h> 102 #include <sys/syslog.h> 103 #include <sys/in_cksum.h> 104 105 #include <machine/stdarg.h> 106 107 #include <vm/vm_zone.h> 108 109 #include <net/if.h> 110 #include <net/route.h> 111 112 #include <netinet/in.h> 113 #include <netinet/in_systm.h> 114 #include <netinet/ip.h> 115 #ifdef INET6 116 #include <netinet/ip6.h> 117 #endif 118 #include <netinet/in_pcb.h> 119 #include <netinet/in_var.h> 120 #include <netinet/ip_var.h> 121 #ifdef INET6 122 #include <netinet6/ip6_var.h> 123 #endif 124 #include <netinet/ip_icmp.h> 125 #include <netinet/icmp_var.h> 126 #include <netinet/udp.h> 127 #include <netinet/udp_var.h> 128 129 #ifdef FAST_IPSEC 130 #include <netproto/ipsec/ipsec.h> 131 #endif 132 133 #ifdef IPSEC 134 #include <netinet6/ipsec.h> 135 #endif 136 137 /* 138 * UDP protocol implementation. 139 * Per RFC 768, August, 1980. 140 */ 141 #ifndef COMPAT_42 142 static int udpcksum = 1; 143 #else 144 static int udpcksum = 0; /* XXX */ 145 #endif 146 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, 147 &udpcksum, 0, ""); 148 149 int log_in_vain = 0; 150 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 151 &log_in_vain, 0, "Log all incoming UDP packets"); 152 153 static int blackhole = 0; 154 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, 155 &blackhole, 0, "Do not send port unreachables for refused connects"); 156 157 static int strict_mcast_mship = 1; 158 SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW, 159 &strict_mcast_mship, 0, "Only send multicast to member sockets"); 160 161 struct inpcbinfo udbinfo; 162 163 #ifndef UDBHASHSIZE 164 #define UDBHASHSIZE 16 165 #endif 166 167 struct udpstat udpstat; /* from udp_var.h */ 168 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW, 169 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); 170 171 static struct sockaddr_in udp_in = { sizeof udp_in, AF_INET }; 172 #ifdef INET6 173 struct udp_in6 { 174 struct sockaddr_in6 uin6_sin; 175 u_char uin6_init_done : 1; 176 } udp_in6 = { 177 { sizeof udp_in6.uin6_sin, AF_INET6 }, 178 0 179 }; 180 struct udp_ip6 { 181 struct ip6_hdr uip6_ip6; 182 u_char uip6_init_done : 1; 183 } udp_ip6; 184 #endif /* INET6 */ 185 186 static void udp_append (struct inpcb *last, struct ip *ip, 187 struct mbuf *n, int off); 188 #ifdef INET6 189 static void ip_2_ip6_hdr (struct ip6_hdr *ip6, struct ip *ip); 190 #endif 191 192 static int udp_detach (struct socket *so); 193 static int udp_output (struct inpcb *, struct mbuf *, struct sockaddr *, 194 struct mbuf *, struct thread *); 195 196 void 197 udp_init() 198 { 199 in_pcbinfo_init(&udbinfo); 200 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask); 201 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB, 202 &udbinfo.porthashmask); 203 udbinfo.wildcardhashbase = hashinit(UDBHASHSIZE, M_PCB, 204 &udbinfo.wildcardhashmask); 205 udbinfo.ipi_zone = zinit("udpcb", sizeof(struct inpcb), maxsockets, 206 ZONE_INTERRUPT, 0); 207 udp_thread_init(); 208 } 209 210 /* 211 * Check multicast packets to make sure they are only sent to sockets with 212 * multicast memberships for the packet's destination address and arrival 213 * interface. Multicast packets to multicast-unaware sockets are also 214 * disallowed. 215 * 216 * Returns 0 if the packet is acceptable, -1 if it is not. 217 */ 218 static __inline int 219 check_multicast_membership(struct ip *ip, struct inpcb *inp, struct mbuf *m) 220 { 221 int mshipno; 222 struct ip_moptions *mopt; 223 224 if (strict_mcast_mship == 0 || 225 !IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 226 return (0); 227 } 228 mopt = inp->inp_moptions; 229 if (mopt == NULL) 230 return (-1); 231 for (mshipno = 0; mshipno <= mopt->imo_num_memberships; ++mshipno) { 232 struct in_multi *maddr = mopt->imo_membership[mshipno]; 233 234 if (ip->ip_dst.s_addr == maddr->inm_addr.s_addr && 235 m->m_pkthdr.rcvif == maddr->inm_ifp) { 236 return (0); 237 } 238 } 239 return (-1); 240 } 241 242 void 243 udp_input(struct mbuf *m, ...) 244 { 245 int iphlen; 246 struct ip *ip; 247 struct udphdr *uh; 248 struct inpcb *inp; 249 struct mbuf *opts = NULL; 250 int len, off, proto; 251 struct ip save_ip; 252 struct sockaddr *append_sa; 253 __va_list ap; 254 255 __va_start(ap, m); 256 off = __va_arg(ap, int); 257 proto = __va_arg(ap, int); 258 __va_end(ap); 259 260 iphlen = off; 261 udpstat.udps_ipackets++; 262 263 /* 264 * Strip IP options, if any; should skip this, 265 * make available to user, and use on returned packets, 266 * but we don't yet have a way to check the checksum 267 * with options still present. 268 */ 269 if (iphlen > sizeof(struct ip)) { 270 ip_stripoptions(m); 271 iphlen = sizeof(struct ip); 272 } 273 274 /* 275 * IP and UDP headers are together in first mbuf. 276 * Already checked and pulled up in ip_demux(). 277 */ 278 KASSERT(m->m_len >= iphlen + sizeof(struct udphdr), 279 ("UDP header not in one mbuf")); 280 281 ip = mtod(m, struct ip *); 282 uh = (struct udphdr *)((caddr_t)ip + iphlen); 283 284 /* destination port of 0 is illegal, based on RFC768. */ 285 if (uh->uh_dport == 0) 286 goto bad; 287 288 /* 289 * Make mbuf data length reflect UDP length. 290 * If not enough data to reflect UDP length, drop. 291 */ 292 len = ntohs((u_short)uh->uh_ulen); 293 if (ip->ip_len != len) { 294 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 295 udpstat.udps_badlen++; 296 goto bad; 297 } 298 m_adj(m, len - ip->ip_len); 299 /* ip->ip_len = len; */ 300 } 301 /* 302 * Save a copy of the IP header in case we want restore it 303 * for sending an ICMP error message in response. 304 */ 305 save_ip = *ip; 306 307 /* 308 * Checksum extended UDP header and data. 309 */ 310 if (uh->uh_sum) { 311 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 312 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 313 uh->uh_sum = m->m_pkthdr.csum_data; 314 else 315 uh->uh_sum = in_pseudo(ip->ip_src.s_addr, 316 ip->ip_dst.s_addr, htonl((u_short)len + 317 m->m_pkthdr.csum_data + IPPROTO_UDP)); 318 uh->uh_sum ^= 0xffff; 319 } else { 320 char b[9]; 321 322 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 323 bzero(((struct ipovly *)ip)->ih_x1, 9); 324 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 325 uh->uh_sum = in_cksum(m, len + sizeof(struct ip)); 326 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 327 } 328 if (uh->uh_sum) { 329 udpstat.udps_badsum++; 330 m_freem(m); 331 return; 332 } 333 } else 334 udpstat.udps_nosum++; 335 336 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 337 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { 338 struct inpcb *last; 339 340 /* 341 * Deliver a multicast or broadcast datagram to *all* sockets 342 * for which the local and remote addresses and ports match 343 * those of the incoming datagram. This allows more than 344 * one process to receive multi/broadcasts on the same port. 345 * (This really ought to be done for unicast datagrams as 346 * well, but that would cause problems with existing 347 * applications that open both address-specific sockets and 348 * a wildcard socket listening to the same port -- they would 349 * end up receiving duplicates of every unicast datagram. 350 * Those applications open the multiple sockets to overcome an 351 * inadequacy of the UDP socket interface, but for backwards 352 * compatibility we avoid the problem here rather than 353 * fixing the interface. Maybe 4.5BSD will remedy this?) 354 */ 355 356 /* 357 * Construct sockaddr format source address. 358 */ 359 udp_in.sin_port = uh->uh_sport; 360 udp_in.sin_addr = ip->ip_src; 361 /* 362 * Locate pcb(s) for datagram. 363 * (Algorithm copied from raw_intr().) 364 */ 365 last = NULL; 366 #ifdef INET6 367 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0; 368 #endif 369 LIST_FOREACH(inp, &udbinfo.pcblisthead, inp_list) { 370 if (inp->inp_flags & INP_PLACEMARKER) 371 continue; 372 #ifdef INET6 373 if (!(inp->inp_vflag & INP_IPV4)) 374 continue; 375 #endif 376 if (inp->inp_lport != uh->uh_dport) 377 continue; 378 if (inp->inp_laddr.s_addr != INADDR_ANY) { 379 if (inp->inp_laddr.s_addr != 380 ip->ip_dst.s_addr) 381 continue; 382 } 383 if (inp->inp_faddr.s_addr != INADDR_ANY) { 384 if (inp->inp_faddr.s_addr != 385 ip->ip_src.s_addr || 386 inp->inp_fport != uh->uh_sport) 387 continue; 388 } 389 390 if (check_multicast_membership(ip, inp, m) < 0) 391 continue; 392 393 if (last != NULL) { 394 struct mbuf *n; 395 396 #ifdef IPSEC 397 /* check AH/ESP integrity. */ 398 if (ipsec4_in_reject_so(m, last->inp_socket)) 399 ipsecstat.in_polvio++; 400 /* do not inject data to pcb */ 401 else 402 #endif /*IPSEC*/ 403 #ifdef FAST_IPSEC 404 /* check AH/ESP integrity. */ 405 if (ipsec4_in_reject(m, last)) 406 ; 407 else 408 #endif /*FAST_IPSEC*/ 409 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) 410 udp_append(last, ip, n, 411 iphlen + 412 sizeof(struct udphdr)); 413 } 414 last = inp; 415 /* 416 * Don't look for additional matches if this one does 417 * not have either the SO_REUSEPORT or SO_REUSEADDR 418 * socket options set. This heuristic avoids searching 419 * through all pcbs in the common case of a non-shared 420 * port. It * assumes that an application will never 421 * clear these options after setting them. 422 */ 423 if (!(last->inp_socket->so_options & 424 (SO_REUSEPORT | SO_REUSEADDR))) 425 break; 426 } 427 428 if (last == NULL) { 429 /* 430 * No matching pcb found; discard datagram. 431 * (No need to send an ICMP Port Unreachable 432 * for a broadcast or multicast datgram.) 433 */ 434 udpstat.udps_noportbcast++; 435 goto bad; 436 } 437 #ifdef IPSEC 438 /* check AH/ESP integrity. */ 439 if (ipsec4_in_reject_so(m, last->inp_socket)) { 440 ipsecstat.in_polvio++; 441 goto bad; 442 } 443 #endif /*IPSEC*/ 444 #ifdef FAST_IPSEC 445 /* check AH/ESP integrity. */ 446 if (ipsec4_in_reject(m, last)) 447 goto bad; 448 #endif /*FAST_IPSEC*/ 449 udp_append(last, ip, m, iphlen + sizeof(struct udphdr)); 450 return; 451 } 452 /* 453 * Locate pcb for datagram. 454 */ 455 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, 456 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 457 if (inp == NULL) { 458 if (log_in_vain) { 459 char buf[sizeof "aaa.bbb.ccc.ddd"]; 460 461 strcpy(buf, inet_ntoa(ip->ip_dst)); 462 log(LOG_INFO, 463 "Connection attempt to UDP %s:%d from %s:%d\n", 464 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 465 ntohs(uh->uh_sport)); 466 } 467 udpstat.udps_noport++; 468 if (m->m_flags & (M_BCAST | M_MCAST)) { 469 udpstat.udps_noportbcast++; 470 goto bad; 471 } 472 if (blackhole) 473 goto bad; 474 #ifdef ICMP_BANDLIM 475 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 476 goto bad; 477 #endif 478 *ip = save_ip; 479 ip->ip_len += iphlen; 480 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 481 return; 482 } 483 #ifdef IPSEC 484 if (ipsec4_in_reject_so(m, inp->inp_socket)) { 485 ipsecstat.in_polvio++; 486 goto bad; 487 } 488 #endif /*IPSEC*/ 489 #ifdef FAST_IPSEC 490 if (ipsec4_in_reject(m, inp)) 491 goto bad; 492 #endif /*FAST_IPSEC*/ 493 494 /* 495 * Construct sockaddr format source address. 496 * Stuff source address and datagram in user buffer. 497 */ 498 udp_in.sin_port = uh->uh_sport; 499 udp_in.sin_addr = ip->ip_src; 500 if ((inp->inp_flags & INP_CONTROLOPTS) || 501 (inp->inp_socket->so_options & SO_TIMESTAMP)) { 502 #ifdef INET6 503 if (inp->inp_vflag & INP_IPV6) { 504 int savedflags; 505 506 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 507 savedflags = inp->inp_flags; 508 inp->inp_flags &= ~INP_UNMAPPABLEOPTS; 509 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m); 510 inp->inp_flags = savedflags; 511 } else 512 #endif 513 ip_savecontrol(inp, &opts, ip, m); 514 } 515 m_adj(m, iphlen + sizeof(struct udphdr)); 516 #ifdef INET6 517 if (inp->inp_vflag & INP_IPV6) { 518 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 519 append_sa = (struct sockaddr *)&udp_in6; 520 } else 521 #endif 522 append_sa = (struct sockaddr *)&udp_in; 523 if (sbappendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) { 524 udpstat.udps_fullsock++; 525 goto bad; 526 } 527 sorwakeup(inp->inp_socket); 528 return; 529 bad: 530 m_freem(m); 531 if (opts) 532 m_freem(opts); 533 return; 534 } 535 536 #ifdef INET6 537 static void 538 ip_2_ip6_hdr(ip6, ip) 539 struct ip6_hdr *ip6; 540 struct ip *ip; 541 { 542 bzero(ip6, sizeof *ip6); 543 544 ip6->ip6_vfc = IPV6_VERSION; 545 ip6->ip6_plen = ip->ip_len; 546 ip6->ip6_nxt = ip->ip_p; 547 ip6->ip6_hlim = ip->ip_ttl; 548 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] = 549 IPV6_ADDR_INT32_SMP; 550 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr; 551 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr; 552 } 553 #endif 554 555 /* 556 * subroutine of udp_input(), mainly for source code readability. 557 * caller must properly init udp_ip6 and udp_in6 beforehand. 558 */ 559 static void 560 udp_append(last, ip, n, off) 561 struct inpcb *last; 562 struct ip *ip; 563 struct mbuf *n; 564 int off; 565 { 566 struct sockaddr *append_sa; 567 struct mbuf *opts = NULL; 568 569 if (last->inp_flags & INP_CONTROLOPTS || 570 last->inp_socket->so_options & SO_TIMESTAMP) { 571 #ifdef INET6 572 if (last->inp_vflag & INP_IPV6) { 573 int savedflags; 574 575 if (udp_ip6.uip6_init_done == 0) { 576 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 577 udp_ip6.uip6_init_done = 1; 578 } 579 savedflags = last->inp_flags; 580 last->inp_flags &= ~INP_UNMAPPABLEOPTS; 581 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n); 582 last->inp_flags = savedflags; 583 } else 584 #endif 585 ip_savecontrol(last, &opts, ip, n); 586 } 587 #ifdef INET6 588 if (last->inp_vflag & INP_IPV6) { 589 if (udp_in6.uin6_init_done == 0) { 590 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 591 udp_in6.uin6_init_done = 1; 592 } 593 append_sa = (struct sockaddr *)&udp_in6.uin6_sin; 594 } else 595 #endif 596 append_sa = (struct sockaddr *)&udp_in; 597 m_adj(n, off); 598 if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) { 599 m_freem(n); 600 if (opts) 601 m_freem(opts); 602 udpstat.udps_fullsock++; 603 } else 604 sorwakeup(last->inp_socket); 605 } 606 607 /* 608 * Notify a udp user of an asynchronous error; 609 * just wake up so that he can collect error status. 610 */ 611 void 612 udp_notify(inp, errno) 613 struct inpcb *inp; 614 int errno; 615 { 616 inp->inp_socket->so_error = errno; 617 sorwakeup(inp->inp_socket); 618 sowwakeup(inp->inp_socket); 619 } 620 621 void 622 udp_ctlinput(cmd, sa, vip) 623 int cmd; 624 struct sockaddr *sa; 625 void *vip; 626 { 627 struct ip *ip = vip; 628 struct udphdr *uh; 629 void (*notify) (struct inpcb *, int) = udp_notify; 630 struct in_addr faddr; 631 struct inpcb *inp; 632 int s; 633 634 faddr = ((struct sockaddr_in *)sa)->sin_addr; 635 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 636 return; 637 638 if (PRC_IS_REDIRECT(cmd)) { 639 ip = NULL; 640 notify = in_rtchange; 641 } else if (cmd == PRC_HOSTDEAD) 642 ip = NULL; 643 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 644 return; 645 if (ip) { 646 s = splnet(); 647 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 648 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport, 649 ip->ip_src, uh->uh_sport, 0, NULL); 650 if (inp != NULL && inp->inp_socket != NULL) 651 (*notify)(inp, inetctlerrmap[cmd]); 652 splx(s); 653 } else 654 in_pcbnotifyall(&udbinfo.pcblisthead, faddr, inetctlerrmap[cmd], 655 notify); 656 } 657 658 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, &udbinfo, 0, 659 in_pcblist_global, "S,xinpcb", "List of active UDP sockets"); 660 661 static int 662 udp_getcred(SYSCTL_HANDLER_ARGS) 663 { 664 struct sockaddr_in addrs[2]; 665 struct inpcb *inp; 666 int error, s; 667 668 error = suser(req->td); 669 if (error) 670 return (error); 671 error = SYSCTL_IN(req, addrs, sizeof addrs); 672 if (error) 673 return (error); 674 s = splnet(); 675 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 676 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 677 if (inp == NULL || inp->inp_socket == NULL) { 678 error = ENOENT; 679 goto out; 680 } 681 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(struct ucred)); 682 out: 683 splx(s); 684 return (error); 685 } 686 687 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 688 0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection"); 689 690 static int 691 udp_output(inp, m, dstaddr, control, td) 692 struct inpcb *inp; 693 struct mbuf *m; 694 struct sockaddr *dstaddr; 695 struct mbuf *control; 696 struct thread *td; 697 { 698 struct udpiphdr *ui; 699 int len = m->m_pkthdr.len; 700 struct sockaddr_in *sin; /* really is initialized before use */ 701 int error = 0; 702 703 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 704 error = EMSGSIZE; 705 goto release; 706 } 707 708 if (inp->inp_lport == 0) { /* unbound socket */ 709 error = in_pcbbind(inp, (struct sockaddr *)NULL, td); 710 if (error) 711 goto release; 712 in_pcbinswildcardhash(inp); 713 } 714 715 if (dstaddr != NULL) { /* destination address specified */ 716 if (inp->inp_faddr.s_addr != INADDR_ANY) { 717 /* already connected */ 718 error = EISCONN; 719 goto release; 720 } 721 sin = (struct sockaddr_in *)dstaddr; 722 prison_remote_ip(td, 0, &sin->sin_addr.s_addr); 723 } else { 724 if (inp->inp_faddr.s_addr == INADDR_ANY) { 725 /* no destination specified and not already connected */ 726 error = ENOTCONN; 727 goto release; 728 } 729 sin = NULL; 730 } 731 732 /* 733 * Calculate data length and get a mbuf 734 * for UDP and IP headers. 735 */ 736 M_PREPEND(m, sizeof(struct udpiphdr), MB_DONTWAIT); 737 if (m == NULL) { 738 error = ENOBUFS; 739 goto release; 740 } 741 742 /* 743 * Fill in mbuf with extended UDP header 744 * and addresses and length put into network format. 745 */ 746 ui = mtod(m, struct udpiphdr *); 747 bzero(ui->ui_x1, sizeof ui->ui_x1); /* XXX still needed? */ 748 ui->ui_pr = IPPROTO_UDP; 749 750 /* 751 * Set destination address. 752 */ 753 if (dstaddr != NULL) { /* use specified destination */ 754 ui->ui_dst = sin->sin_addr; 755 ui->ui_dport = sin->sin_port; 756 } else { /* use connected destination */ 757 ui->ui_dst = inp->inp_faddr; 758 ui->ui_dport = inp->inp_fport; 759 } 760 761 /* 762 * Set source address. 763 */ 764 if (inp->inp_laddr.s_addr == INADDR_ANY) { 765 struct sockaddr_in *if_sin; 766 767 KASSERT(dstaddr != NULL, 768 ("connected UDP socket without local addr: " 769 "lport %d, faddr %x, fport %d", 770 inp->inp_lport, inp->inp_faddr.s_addr, inp->inp_fport)); 771 772 /* Look up outgoing interface. */ 773 if ((error = in_pcbladdr(inp, dstaddr, &if_sin))) 774 goto release; 775 ui->ui_src = if_sin->sin_addr; /* use address of interface */ 776 } else { 777 ui->ui_src = inp->inp_laddr; /* use non-null bound address */ 778 } 779 ui->ui_sport = inp->inp_lport; 780 KASSERT(inp->inp_lport != 0, ("inp lport should have been bound")); 781 782 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 return (error); 805 806 release: 807 m_freem(m); 808 return (error); 809 } 810 811 u_long udp_sendspace = 9216; /* really max datagram size */ 812 /* 40 1K datagrams */ 813 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 814 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 815 816 u_long udp_recvspace = 40 * (1024 + 817 #ifdef INET6 818 sizeof(struct sockaddr_in6) 819 #else 820 sizeof(struct sockaddr_in) 821 #endif 822 ); 823 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 824 &udp_recvspace, 0, "Maximum incoming UDP datagram size"); 825 826 static int 827 udp_abort(struct socket *so) 828 { 829 struct inpcb *inp; 830 int s; 831 832 inp = sotoinpcb(so); 833 if (inp == NULL) 834 return EINVAL; /* ??? possible? panic instead? */ 835 soisdisconnected(so); 836 s = splnet(); 837 in_pcbdetach(inp); 838 splx(s); 839 return 0; 840 } 841 842 static int 843 udp_attach(struct socket *so, int proto, struct pru_attach_info *ai) 844 { 845 struct inpcb *inp; 846 int s, error; 847 848 inp = sotoinpcb(so); 849 if (inp != NULL) 850 return EINVAL; 851 852 error = soreserve(so, udp_sendspace, udp_recvspace, ai->sb_rlimit); 853 if (error) 854 return error; 855 s = splnet(); 856 error = in_pcballoc(so, &udbinfo); 857 splx(s); 858 if (error) 859 return error; 860 861 inp = (struct inpcb *)so->so_pcb; 862 inp->inp_vflag |= INP_IPV4; 863 inp->inp_ip_ttl = ip_defttl; 864 return 0; 865 } 866 867 static int 868 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 869 { 870 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 871 struct inpcb *inp; 872 int s, error; 873 874 inp = sotoinpcb(so); 875 if (inp == NULL) 876 return EINVAL; 877 s = splnet(); 878 error = in_pcbbind(inp, nam, td); 879 splx(s); 880 if (error == 0) { 881 if (sin->sin_addr.s_addr != INADDR_ANY) 882 inp->inp_flags |= INP_WASBOUND_NOTANY; 883 in_pcbinswildcardhash(inp); 884 } 885 return error; 886 } 887 888 static int 889 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 890 { 891 struct inpcb *inp; 892 int s, error; 893 struct sockaddr_in *sin; 894 895 inp = sotoinpcb(so); 896 if (inp == NULL) 897 return EINVAL; 898 if (inp->inp_faddr.s_addr != INADDR_ANY) 899 return EISCONN; 900 error = 0; 901 s = splnet(); 902 if (td->td_proc && td->td_proc->p_ucred->cr_prison != NULL && 903 inp->inp_laddr.s_addr == INADDR_ANY) { 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 if (inp->inp_flags & INP_WILDCARD) 910 in_pcbremwildcardhash(inp); 911 error = in_pcbconnect(inp, nam, td); 912 } 913 splx(s); 914 if (error == 0) 915 soisconnected(so); 916 else if (error == EAFNOSUPPORT) { /* connection dissolved */ 917 /* 918 * Follow traditional BSD behavior and retain 919 * the local port binding. But, fix the old misbehavior 920 * of overwriting any previously bound local address. 921 */ 922 if (!(inp->inp_flags & INP_WASBOUND_NOTANY)) 923 inp->inp_laddr.s_addr = INADDR_ANY; 924 in_pcbinswildcardhash(inp); 925 } 926 return error; 927 } 928 929 static int 930 udp_detach(struct socket *so) 931 { 932 struct inpcb *inp; 933 int s; 934 935 inp = sotoinpcb(so); 936 if (inp == NULL) 937 return EINVAL; 938 s = splnet(); 939 in_pcbdetach(inp); 940 splx(s); 941 return 0; 942 } 943 944 static int 945 udp_disconnect(struct socket *so) 946 { 947 struct inpcb *inp; 948 int s; 949 950 inp = sotoinpcb(so); 951 if (inp == NULL) 952 return EINVAL; 953 if (inp->inp_faddr.s_addr == INADDR_ANY) 954 return ENOTCONN; 955 956 s = splnet(); 957 in_pcbdisconnect(inp); 958 splx(s); 959 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 960 return 0; 961 } 962 963 static int 964 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 965 struct mbuf *control, struct thread *td) 966 { 967 struct inpcb *inp; 968 969 inp = sotoinpcb(so); 970 if (inp == NULL) { 971 m_freem(m); 972 return EINVAL; 973 } 974 return udp_output(inp, m, addr, control, td); 975 } 976 977 int 978 udp_shutdown(struct socket *so) 979 { 980 struct inpcb *inp; 981 982 inp = sotoinpcb(so); 983 if (inp == NULL) 984 return EINVAL; 985 socantsendmore(so); 986 return 0; 987 } 988 989 struct pr_usrreqs udp_usrreqs = { 990 udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect, 991 pru_connect2_notsupp, in_control, udp_detach, udp_disconnect, 992 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp, 993 pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown, 994 in_setsockaddr, sosendudp, soreceive, sopoll 995 }; 996 997