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) 1982, 1986, 1988, 1990, 1993, 1995 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 67 * $FreeBSD: src/sys/netinet/udp_usrreq.c,v 1.64.2.18 2003/01/24 05:11:34 sam Exp $ 68 * $DragonFly: src/sys/netinet/udp_usrreq.c,v 1.42 2007/04/22 01:13:14 dillon Exp $ 69 */ 70 71 #include "opt_ipsec.h" 72 #include "opt_inet6.h" 73 74 #include <sys/param.h> 75 #include <sys/systm.h> 76 #include <sys/kernel.h> 77 #include <sys/malloc.h> 78 #include <sys/mbuf.h> 79 #include <sys/domain.h> 80 #include <sys/proc.h> 81 #include <sys/protosw.h> 82 #include <sys/socket.h> 83 #include <sys/socketvar.h> 84 #include <sys/sysctl.h> 85 #include <sys/syslog.h> 86 #include <sys/thread2.h> 87 #include <sys/in_cksum.h> 88 89 #include <machine/stdarg.h> 90 91 #include <vm/vm_zone.h> 92 93 #include <net/if.h> 94 #include <net/route.h> 95 96 #include <netinet/in.h> 97 #include <netinet/in_systm.h> 98 #include <netinet/ip.h> 99 #ifdef INET6 100 #include <netinet/ip6.h> 101 #endif 102 #include <netinet/in_pcb.h> 103 #include <netinet/in_var.h> 104 #include <netinet/ip_var.h> 105 #ifdef INET6 106 #include <netinet6/ip6_var.h> 107 #endif 108 #include <netinet/ip_icmp.h> 109 #include <netinet/icmp_var.h> 110 #include <netinet/udp.h> 111 #include <netinet/udp_var.h> 112 113 #ifdef FAST_IPSEC 114 #include <netproto/ipsec/ipsec.h> 115 #endif 116 117 #ifdef IPSEC 118 #include <netinet6/ipsec.h> 119 #endif 120 121 /* 122 * UDP protocol implementation. 123 * Per RFC 768, August, 1980. 124 */ 125 #ifndef COMPAT_42 126 static int udpcksum = 1; 127 #else 128 static int udpcksum = 0; /* XXX */ 129 #endif 130 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, 131 &udpcksum, 0, ""); 132 133 int log_in_vain = 0; 134 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 135 &log_in_vain, 0, "Log all incoming UDP packets"); 136 137 static int blackhole = 0; 138 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, 139 &blackhole, 0, "Do not send port unreachables for refused connects"); 140 141 static int strict_mcast_mship = 1; 142 SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW, 143 &strict_mcast_mship, 0, "Only send multicast to member sockets"); 144 145 struct inpcbinfo udbinfo; 146 147 #ifndef UDBHASHSIZE 148 #define UDBHASHSIZE 16 149 #endif 150 151 struct udpstat udpstat; /* from udp_var.h */ 152 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW, 153 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); 154 155 static struct sockaddr_in udp_in = { sizeof udp_in, AF_INET }; 156 #ifdef INET6 157 struct udp_in6 { 158 struct sockaddr_in6 uin6_sin; 159 u_char uin6_init_done : 1; 160 } udp_in6 = { 161 { sizeof udp_in6.uin6_sin, AF_INET6 }, 162 0 163 }; 164 struct udp_ip6 { 165 struct ip6_hdr uip6_ip6; 166 u_char uip6_init_done : 1; 167 } udp_ip6; 168 #endif /* INET6 */ 169 170 static void udp_append (struct inpcb *last, struct ip *ip, 171 struct mbuf *n, int off); 172 #ifdef INET6 173 static void ip_2_ip6_hdr (struct ip6_hdr *ip6, struct ip *ip); 174 #endif 175 176 static int udp_detach (struct socket *so); 177 static int udp_output (struct inpcb *, struct mbuf *, struct sockaddr *, 178 struct mbuf *, struct thread *); 179 180 void 181 udp_init(void) 182 { 183 in_pcbinfo_init(&udbinfo); 184 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask); 185 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB, 186 &udbinfo.porthashmask); 187 udbinfo.wildcardhashbase = hashinit(UDBHASHSIZE, M_PCB, 188 &udbinfo.wildcardhashmask); 189 udbinfo.ipi_zone = zinit("udpcb", sizeof(struct inpcb), maxsockets, 190 ZONE_INTERRUPT, 0); 191 udp_thread_init(); 192 } 193 194 /* 195 * Check multicast packets to make sure they are only sent to sockets with 196 * multicast memberships for the packet's destination address and arrival 197 * interface. Multicast packets to multicast-unaware sockets are also 198 * disallowed. 199 * 200 * Returns 0 if the packet is acceptable, -1 if it is not. 201 */ 202 static __inline int 203 check_multicast_membership(struct ip *ip, struct inpcb *inp, struct mbuf *m) 204 { 205 int mshipno; 206 struct ip_moptions *mopt; 207 208 if (strict_mcast_mship == 0 || 209 !IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 210 return (0); 211 } 212 mopt = inp->inp_moptions; 213 if (mopt == NULL) 214 return (-1); 215 for (mshipno = 0; mshipno <= mopt->imo_num_memberships; ++mshipno) { 216 struct in_multi *maddr = mopt->imo_membership[mshipno]; 217 218 if (ip->ip_dst.s_addr == maddr->inm_addr.s_addr && 219 m->m_pkthdr.rcvif == maddr->inm_ifp) { 220 return (0); 221 } 222 } 223 return (-1); 224 } 225 226 void 227 udp_input(struct mbuf *m, ...) 228 { 229 int iphlen; 230 struct ip *ip; 231 struct udphdr *uh; 232 struct inpcb *inp; 233 struct mbuf *opts = NULL; 234 int len, off, proto; 235 struct ip save_ip; 236 struct sockaddr *append_sa; 237 __va_list ap; 238 239 __va_start(ap, m); 240 off = __va_arg(ap, int); 241 proto = __va_arg(ap, int); 242 __va_end(ap); 243 244 iphlen = off; 245 udpstat.udps_ipackets++; 246 247 /* 248 * Strip IP options, if any; should skip this, 249 * make available to user, and use on returned packets, 250 * but we don't yet have a way to check the checksum 251 * with options still present. 252 */ 253 if (iphlen > sizeof(struct ip)) { 254 ip_stripoptions(m); 255 iphlen = sizeof(struct ip); 256 } 257 258 /* 259 * IP and UDP headers are together in first mbuf. 260 * Already checked and pulled up in ip_demux(). 261 */ 262 KASSERT(m->m_len >= iphlen + sizeof(struct udphdr), 263 ("UDP header not in one mbuf")); 264 265 ip = mtod(m, struct ip *); 266 uh = (struct udphdr *)((caddr_t)ip + iphlen); 267 268 /* destination port of 0 is illegal, based on RFC768. */ 269 if (uh->uh_dport == 0) 270 goto bad; 271 272 /* 273 * Make mbuf data length reflect UDP length. 274 * If not enough data to reflect UDP length, drop. 275 */ 276 len = ntohs((u_short)uh->uh_ulen); 277 if (ip->ip_len != len) { 278 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 279 udpstat.udps_badlen++; 280 goto bad; 281 } 282 m_adj(m, len - ip->ip_len); 283 /* ip->ip_len = len; */ 284 } 285 /* 286 * Save a copy of the IP header in case we want restore it 287 * for sending an ICMP error message in response. 288 */ 289 save_ip = *ip; 290 291 /* 292 * Checksum extended UDP header and data. 293 */ 294 if (uh->uh_sum) { 295 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 296 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 297 uh->uh_sum = m->m_pkthdr.csum_data; 298 else 299 uh->uh_sum = in_pseudo(ip->ip_src.s_addr, 300 ip->ip_dst.s_addr, htonl((u_short)len + 301 m->m_pkthdr.csum_data + IPPROTO_UDP)); 302 uh->uh_sum ^= 0xffff; 303 } else { 304 char b[9]; 305 306 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 307 bzero(((struct ipovly *)ip)->ih_x1, 9); 308 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 309 uh->uh_sum = in_cksum(m, len + sizeof(struct ip)); 310 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 311 } 312 if (uh->uh_sum) { 313 udpstat.udps_badsum++; 314 m_freem(m); 315 return; 316 } 317 } else 318 udpstat.udps_nosum++; 319 320 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 321 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { 322 struct inpcb *last; 323 324 /* 325 * Deliver a multicast or broadcast datagram to *all* sockets 326 * for which the local and remote addresses and ports match 327 * those of the incoming datagram. This allows more than 328 * one process to receive multi/broadcasts on the same port. 329 * (This really ought to be done for unicast datagrams as 330 * well, but that would cause problems with existing 331 * applications that open both address-specific sockets and 332 * a wildcard socket listening to the same port -- they would 333 * end up receiving duplicates of every unicast datagram. 334 * Those applications open the multiple sockets to overcome an 335 * inadequacy of the UDP socket interface, but for backwards 336 * compatibility we avoid the problem here rather than 337 * fixing the interface. Maybe 4.5BSD will remedy this?) 338 */ 339 340 /* 341 * Construct sockaddr format source address. 342 */ 343 udp_in.sin_port = uh->uh_sport; 344 udp_in.sin_addr = ip->ip_src; 345 /* 346 * Locate pcb(s) for datagram. 347 * (Algorithm copied from raw_intr().) 348 */ 349 last = NULL; 350 #ifdef INET6 351 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0; 352 #endif 353 LIST_FOREACH(inp, &udbinfo.pcblisthead, inp_list) { 354 if (inp->inp_flags & INP_PLACEMARKER) 355 continue; 356 #ifdef INET6 357 if (!(inp->inp_vflag & INP_IPV4)) 358 continue; 359 #endif 360 if (inp->inp_lport != uh->uh_dport) 361 continue; 362 if (inp->inp_laddr.s_addr != INADDR_ANY) { 363 if (inp->inp_laddr.s_addr != 364 ip->ip_dst.s_addr) 365 continue; 366 } 367 if (inp->inp_faddr.s_addr != INADDR_ANY) { 368 if (inp->inp_faddr.s_addr != 369 ip->ip_src.s_addr || 370 inp->inp_fport != uh->uh_sport) 371 continue; 372 } 373 374 if (check_multicast_membership(ip, inp, m) < 0) 375 continue; 376 377 if (last != NULL) { 378 struct mbuf *n; 379 380 #ifdef IPSEC 381 /* check AH/ESP integrity. */ 382 if (ipsec4_in_reject_so(m, last->inp_socket)) 383 ipsecstat.in_polvio++; 384 /* do not inject data to pcb */ 385 else 386 #endif /*IPSEC*/ 387 #ifdef FAST_IPSEC 388 /* check AH/ESP integrity. */ 389 if (ipsec4_in_reject(m, last)) 390 ; 391 else 392 #endif /*FAST_IPSEC*/ 393 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) 394 udp_append(last, ip, n, 395 iphlen + 396 sizeof(struct udphdr)); 397 } 398 last = inp; 399 /* 400 * Don't look for additional matches if this one does 401 * not have either the SO_REUSEPORT or SO_REUSEADDR 402 * socket options set. This heuristic avoids searching 403 * through all pcbs in the common case of a non-shared 404 * port. It * assumes that an application will never 405 * clear these options after setting them. 406 */ 407 if (!(last->inp_socket->so_options & 408 (SO_REUSEPORT | SO_REUSEADDR))) 409 break; 410 } 411 412 if (last == NULL) { 413 /* 414 * No matching pcb found; discard datagram. 415 * (No need to send an ICMP Port Unreachable 416 * for a broadcast or multicast datgram.) 417 */ 418 udpstat.udps_noportbcast++; 419 goto bad; 420 } 421 #ifdef IPSEC 422 /* check AH/ESP integrity. */ 423 if (ipsec4_in_reject_so(m, last->inp_socket)) { 424 ipsecstat.in_polvio++; 425 goto bad; 426 } 427 #endif /*IPSEC*/ 428 #ifdef FAST_IPSEC 429 /* check AH/ESP integrity. */ 430 if (ipsec4_in_reject(m, last)) 431 goto bad; 432 #endif /*FAST_IPSEC*/ 433 udp_append(last, ip, m, iphlen + sizeof(struct udphdr)); 434 return; 435 } 436 /* 437 * Locate pcb for datagram. 438 */ 439 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, 440 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 441 if (inp == NULL) { 442 if (log_in_vain) { 443 char buf[sizeof "aaa.bbb.ccc.ddd"]; 444 445 strcpy(buf, inet_ntoa(ip->ip_dst)); 446 log(LOG_INFO, 447 "Connection attempt to UDP %s:%d from %s:%d\n", 448 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 449 ntohs(uh->uh_sport)); 450 } 451 udpstat.udps_noport++; 452 if (m->m_flags & (M_BCAST | M_MCAST)) { 453 udpstat.udps_noportbcast++; 454 goto bad; 455 } 456 if (blackhole) 457 goto bad; 458 #ifdef ICMP_BANDLIM 459 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 460 goto bad; 461 #endif 462 *ip = save_ip; 463 ip->ip_len += iphlen; 464 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 465 return; 466 } 467 #ifdef IPSEC 468 if (ipsec4_in_reject_so(m, inp->inp_socket)) { 469 ipsecstat.in_polvio++; 470 goto bad; 471 } 472 #endif /*IPSEC*/ 473 #ifdef FAST_IPSEC 474 if (ipsec4_in_reject(m, inp)) 475 goto bad; 476 #endif /*FAST_IPSEC*/ 477 /* 478 * Check the minimum TTL for socket. 479 */ 480 if (ip->ip_ttl < inp->inp_ip_minttl) 481 goto bad; 482 483 /* 484 * Construct sockaddr format source address. 485 * Stuff source address and datagram in user buffer. 486 */ 487 udp_in.sin_port = uh->uh_sport; 488 udp_in.sin_addr = ip->ip_src; 489 if ((inp->inp_flags & INP_CONTROLOPTS) || 490 (inp->inp_socket->so_options & SO_TIMESTAMP)) { 491 #ifdef INET6 492 if (inp->inp_vflag & INP_IPV6) { 493 int savedflags; 494 495 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 496 savedflags = inp->inp_flags; 497 inp->inp_flags &= ~INP_UNMAPPABLEOPTS; 498 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m); 499 inp->inp_flags = savedflags; 500 } else 501 #endif 502 ip_savecontrol(inp, &opts, ip, m); 503 } 504 m_adj(m, iphlen + sizeof(struct udphdr)); 505 #ifdef INET6 506 if (inp->inp_vflag & INP_IPV6) { 507 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 508 append_sa = (struct sockaddr *)&udp_in6; 509 } else 510 #endif 511 append_sa = (struct sockaddr *)&udp_in; 512 if (ssb_appendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) { 513 udpstat.udps_fullsock++; 514 goto bad; 515 } 516 sorwakeup(inp->inp_socket); 517 return; 518 bad: 519 m_freem(m); 520 if (opts) 521 m_freem(opts); 522 return; 523 } 524 525 #ifdef INET6 526 static void 527 ip_2_ip6_hdr(struct ip6_hdr *ip6, struct ip *ip) 528 { 529 bzero(ip6, sizeof *ip6); 530 531 ip6->ip6_vfc = IPV6_VERSION; 532 ip6->ip6_plen = ip->ip_len; 533 ip6->ip6_nxt = ip->ip_p; 534 ip6->ip6_hlim = ip->ip_ttl; 535 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] = 536 IPV6_ADDR_INT32_SMP; 537 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr; 538 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr; 539 } 540 #endif 541 542 /* 543 * subroutine of udp_input(), mainly for source code readability. 544 * caller must properly init udp_ip6 and udp_in6 beforehand. 545 */ 546 static void 547 udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, int off) 548 { 549 struct sockaddr *append_sa; 550 struct mbuf *opts = NULL; 551 552 if (last->inp_flags & INP_CONTROLOPTS || 553 last->inp_socket->so_options & SO_TIMESTAMP) { 554 #ifdef INET6 555 if (last->inp_vflag & INP_IPV6) { 556 int savedflags; 557 558 if (udp_ip6.uip6_init_done == 0) { 559 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 560 udp_ip6.uip6_init_done = 1; 561 } 562 savedflags = last->inp_flags; 563 last->inp_flags &= ~INP_UNMAPPABLEOPTS; 564 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n); 565 last->inp_flags = savedflags; 566 } else 567 #endif 568 ip_savecontrol(last, &opts, ip, n); 569 } 570 #ifdef INET6 571 if (last->inp_vflag & INP_IPV6) { 572 if (udp_in6.uin6_init_done == 0) { 573 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 574 udp_in6.uin6_init_done = 1; 575 } 576 append_sa = (struct sockaddr *)&udp_in6.uin6_sin; 577 } else 578 #endif 579 append_sa = (struct sockaddr *)&udp_in; 580 m_adj(n, off); 581 if (ssb_appendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) { 582 m_freem(n); 583 if (opts) 584 m_freem(opts); 585 udpstat.udps_fullsock++; 586 } else 587 sorwakeup(last->inp_socket); 588 } 589 590 /* 591 * Notify a udp user of an asynchronous error; 592 * just wake up so that he can collect error status. 593 */ 594 void 595 udp_notify(struct inpcb *inp, int error) 596 { 597 inp->inp_socket->so_error = error; 598 sorwakeup(inp->inp_socket); 599 sowwakeup(inp->inp_socket); 600 } 601 602 void 603 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip) 604 { 605 struct ip *ip = vip; 606 struct udphdr *uh; 607 void (*notify) (struct inpcb *, int) = udp_notify; 608 struct in_addr faddr; 609 struct inpcb *inp; 610 611 faddr = ((struct sockaddr_in *)sa)->sin_addr; 612 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 613 return; 614 615 if (PRC_IS_REDIRECT(cmd)) { 616 ip = NULL; 617 notify = in_rtchange; 618 } else if (cmd == PRC_HOSTDEAD) 619 ip = NULL; 620 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 621 return; 622 if (ip) { 623 crit_enter(); 624 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 625 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport, 626 ip->ip_src, uh->uh_sport, 0, NULL); 627 if (inp != NULL && inp->inp_socket != NULL) 628 (*notify)(inp, inetctlerrmap[cmd]); 629 crit_exit(); 630 } else 631 in_pcbnotifyall(&udbinfo.pcblisthead, faddr, inetctlerrmap[cmd], 632 notify); 633 } 634 635 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, &udbinfo, 0, 636 in_pcblist_global, "S,xinpcb", "List of active UDP sockets"); 637 638 static int 639 udp_getcred(SYSCTL_HANDLER_ARGS) 640 { 641 struct sockaddr_in addrs[2]; 642 struct inpcb *inp; 643 int error; 644 645 error = suser(req->td); 646 if (error) 647 return (error); 648 error = SYSCTL_IN(req, addrs, sizeof addrs); 649 if (error) 650 return (error); 651 crit_enter(); 652 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 653 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 654 if (inp == NULL || inp->inp_socket == NULL) { 655 error = ENOENT; 656 goto out; 657 } 658 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(struct ucred)); 659 out: 660 crit_exit(); 661 return (error); 662 } 663 664 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 665 0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection"); 666 667 static int 668 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *dstaddr, 669 struct mbuf *control, struct thread *td) 670 { 671 struct udpiphdr *ui; 672 int len = m->m_pkthdr.len; 673 struct sockaddr_in *sin; /* really is initialized before use */ 674 int error = 0; 675 676 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 677 error = EMSGSIZE; 678 goto release; 679 } 680 681 if (inp->inp_lport == 0) { /* unbound socket */ 682 error = in_pcbbind(inp, (struct sockaddr *)NULL, td); 683 if (error) 684 goto release; 685 in_pcbinswildcardhash(inp); 686 } 687 688 if (dstaddr != NULL) { /* destination address specified */ 689 if (inp->inp_faddr.s_addr != INADDR_ANY) { 690 /* already connected */ 691 error = EISCONN; 692 goto release; 693 } 694 sin = (struct sockaddr_in *)dstaddr; 695 if (!prison_remote_ip(td, (struct sockaddr *)&sin)) { 696 error = EAFNOSUPPORT; /* IPv6 only jail */ 697 goto release; 698 } 699 } else { 700 if (inp->inp_faddr.s_addr == INADDR_ANY) { 701 /* no destination specified and not already connected */ 702 error = ENOTCONN; 703 goto release; 704 } 705 sin = NULL; 706 } 707 708 /* 709 * Calculate data length and get a mbuf 710 * for UDP and IP headers. 711 */ 712 M_PREPEND(m, sizeof(struct udpiphdr), MB_DONTWAIT); 713 if (m == NULL) { 714 error = ENOBUFS; 715 goto release; 716 } 717 718 /* 719 * Fill in mbuf with extended UDP header 720 * and addresses and length put into network format. 721 */ 722 ui = mtod(m, struct udpiphdr *); 723 bzero(ui->ui_x1, sizeof ui->ui_x1); /* XXX still needed? */ 724 ui->ui_pr = IPPROTO_UDP; 725 726 /* 727 * Set destination address. 728 */ 729 if (dstaddr != NULL) { /* use specified destination */ 730 ui->ui_dst = sin->sin_addr; 731 ui->ui_dport = sin->sin_port; 732 } else { /* use connected destination */ 733 ui->ui_dst = inp->inp_faddr; 734 ui->ui_dport = inp->inp_fport; 735 } 736 737 /* 738 * Set source address. 739 */ 740 if (inp->inp_laddr.s_addr == INADDR_ANY) { 741 struct sockaddr_in *if_sin; 742 743 if (dstaddr == NULL) { 744 /* 745 * connect() had (or should have) failed because 746 * the interface had no IP address, but the 747 * application proceeded to call send() anyways. 748 */ 749 error = ENOTCONN; 750 goto release; 751 } 752 753 /* Look up outgoing interface. */ 754 if ((error = in_pcbladdr(inp, dstaddr, &if_sin, td))) 755 goto release; 756 ui->ui_src = if_sin->sin_addr; /* use address of interface */ 757 } else { 758 ui->ui_src = inp->inp_laddr; /* use non-null bound address */ 759 } 760 ui->ui_sport = inp->inp_lport; 761 KASSERT(inp->inp_lport != 0, ("inp lport should have been bound")); 762 763 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 764 765 /* 766 * Set up checksum and output datagram. 767 */ 768 if (udpcksum) { 769 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr, 770 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 771 m->m_pkthdr.csum_flags = CSUM_UDP; 772 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 773 } else { 774 ui->ui_sum = 0; 775 } 776 ((struct ip *)ui)->ip_len = sizeof(struct udpiphdr) + len; 777 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 778 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 779 udpstat.udps_opackets++; 780 781 error = ip_output(m, inp->inp_options, &inp->inp_route, 782 (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)), 783 inp->inp_moptions, inp); 784 785 return (error); 786 787 release: 788 m_freem(m); 789 return (error); 790 } 791 792 u_long udp_sendspace = 9216; /* really max datagram size */ 793 /* 40 1K datagrams */ 794 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 795 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 796 797 u_long udp_recvspace = 40 * (1024 + 798 #ifdef INET6 799 sizeof(struct sockaddr_in6) 800 #else 801 sizeof(struct sockaddr_in) 802 #endif 803 ); 804 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 805 &udp_recvspace, 0, "Maximum incoming UDP datagram size"); 806 807 static int 808 udp_abort(struct socket *so) 809 { 810 struct inpcb *inp; 811 812 inp = so->so_pcb; 813 if (inp == NULL) 814 return EINVAL; /* ??? possible? panic instead? */ 815 soisdisconnected(so); 816 crit_enter(); 817 in_pcbdetach(inp); 818 crit_exit(); 819 return 0; 820 } 821 822 static int 823 udp_attach(struct socket *so, int proto, struct pru_attach_info *ai) 824 { 825 struct inpcb *inp; 826 int error; 827 828 inp = so->so_pcb; 829 if (inp != NULL) 830 return EINVAL; 831 832 error = soreserve(so, udp_sendspace, udp_recvspace, ai->sb_rlimit); 833 if (error) 834 return error; 835 crit_enter(); 836 error = in_pcballoc(so, &udbinfo); 837 crit_exit(); 838 if (error) 839 return error; 840 841 inp = (struct inpcb *)so->so_pcb; 842 inp->inp_vflag |= INP_IPV4; 843 inp->inp_ip_ttl = ip_defttl; 844 return 0; 845 } 846 847 static int 848 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 849 { 850 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 851 struct inpcb *inp; 852 int error; 853 854 inp = so->so_pcb; 855 if (inp == NULL) 856 return EINVAL; 857 crit_enter(); 858 error = in_pcbbind(inp, nam, td); 859 crit_exit(); 860 if (error == 0) { 861 if (sin->sin_addr.s_addr != INADDR_ANY) 862 inp->inp_flags |= INP_WASBOUND_NOTANY; 863 in_pcbinswildcardhash(inp); 864 } 865 return error; 866 } 867 868 static int 869 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 870 { 871 struct inpcb *inp; 872 int error; 873 874 inp = so->so_pcb; 875 if (inp == NULL) 876 return EINVAL; 877 if (inp->inp_faddr.s_addr != INADDR_ANY) 878 return EISCONN; 879 error = 0; 880 crit_enter(); 881 if (td->td_proc && td->td_proc->p_ucred->cr_prison != NULL && 882 inp->inp_laddr.s_addr == INADDR_ANY) { 883 error = in_pcbbind(inp, NULL, td); 884 } 885 if (error == 0) { 886 if (!prison_remote_ip(td, nam)) 887 return(EAFNOSUPPORT); /* IPv6 only jail */ 888 if (inp->inp_flags & INP_WILDCARD) 889 in_pcbremwildcardhash(inp); 890 error = in_pcbconnect(inp, nam, td); 891 } 892 crit_exit(); 893 if (error == 0) 894 soisconnected(so); 895 else if (error == EAFNOSUPPORT) { /* connection dissolved */ 896 /* 897 * Follow traditional BSD behavior and retain 898 * the local port binding. But, fix the old misbehavior 899 * of overwriting any previously bound local address. 900 */ 901 if (!(inp->inp_flags & INP_WASBOUND_NOTANY)) 902 inp->inp_laddr.s_addr = INADDR_ANY; 903 in_pcbinswildcardhash(inp); 904 } 905 return error; 906 } 907 908 static int 909 udp_detach(struct socket *so) 910 { 911 struct inpcb *inp; 912 913 inp = so->so_pcb; 914 if (inp == NULL) 915 return EINVAL; 916 crit_enter(); 917 in_pcbdetach(inp); 918 crit_exit(); 919 return 0; 920 } 921 922 static int 923 udp_disconnect(struct socket *so) 924 { 925 struct inpcb *inp; 926 927 inp = so->so_pcb; 928 if (inp == NULL) 929 return EINVAL; 930 if (inp->inp_faddr.s_addr == INADDR_ANY) 931 return ENOTCONN; 932 933 crit_enter(); 934 in_pcbdisconnect(inp); 935 crit_exit(); 936 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 937 return 0; 938 } 939 940 static int 941 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 942 struct mbuf *control, struct thread *td) 943 { 944 struct inpcb *inp; 945 946 inp = so->so_pcb; 947 if (inp == NULL) { 948 m_freem(m); 949 return EINVAL; 950 } 951 return udp_output(inp, m, addr, control, td); 952 } 953 954 int 955 udp_shutdown(struct socket *so) 956 { 957 struct inpcb *inp; 958 959 inp = so->so_pcb; 960 if (inp == NULL) 961 return EINVAL; 962 socantsendmore(so); 963 return 0; 964 } 965 966 struct pr_usrreqs udp_usrreqs = { 967 .pru_abort = udp_abort, 968 .pru_accept = pru_accept_notsupp, 969 .pru_attach = udp_attach, 970 .pru_bind = udp_bind, 971 .pru_connect = udp_connect, 972 .pru_connect2 = pru_connect2_notsupp, 973 .pru_control = in_control, 974 .pru_detach = udp_detach, 975 .pru_disconnect = udp_disconnect, 976 .pru_listen = pru_listen_notsupp, 977 .pru_peeraddr = in_setpeeraddr, 978 .pru_rcvd = pru_rcvd_notsupp, 979 .pru_rcvoob = pru_rcvoob_notsupp, 980 .pru_send = udp_send, 981 .pru_sense = pru_sense_null, 982 .pru_shutdown = udp_shutdown, 983 .pru_sockaddr = in_setsockaddr, 984 .pru_sosend = sosendudp, 985 .pru_soreceive = soreceive, 986 .pru_sopoll = sopoll 987 }; 988 989