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 1.46 2008/09/23 11:28:49 sephe 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 int udp_mpsafe_proto = 0; 122 TUNABLE_INT("net.inet.udp.mpsafe_proto", &udp_mpsafe_proto); 123 124 int udp_mpsafe_thread = 0; 125 TUNABLE_INT("net.inet.udp.mpsafe_thread", &udp_mpsafe_thread); 126 SYSCTL_INT(_net_inet_udp, OID_AUTO, mpsafe_thread, CTLFLAG_RW, 127 &udp_mpsafe_thread, 0, 128 "0:BGL, 1:Adaptive BGL, 2:No BGL(experimental)"); 129 130 /* 131 * UDP protocol implementation. 132 * Per RFC 768, August, 1980. 133 */ 134 #ifndef COMPAT_42 135 static int udpcksum = 1; 136 #else 137 static int udpcksum = 0; /* XXX */ 138 #endif 139 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, 140 &udpcksum, 0, ""); 141 142 int log_in_vain = 0; 143 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 144 &log_in_vain, 0, "Log all incoming UDP packets"); 145 146 static int blackhole = 0; 147 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, 148 &blackhole, 0, "Do not send port unreachables for refused connects"); 149 150 static int strict_mcast_mship = 1; 151 SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW, 152 &strict_mcast_mship, 0, "Only send multicast to member sockets"); 153 154 struct inpcbinfo udbinfo; 155 156 #ifndef UDBHASHSIZE 157 #define UDBHASHSIZE 16 158 #endif 159 160 struct udpstat udpstat; /* from udp_var.h */ 161 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW, 162 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); 163 164 static struct sockaddr_in udp_in = { sizeof udp_in, AF_INET }; 165 #ifdef INET6 166 struct udp_in6 { 167 struct sockaddr_in6 uin6_sin; 168 u_char uin6_init_done : 1; 169 } udp_in6 = { 170 { sizeof udp_in6.uin6_sin, AF_INET6 }, 171 0 172 }; 173 struct udp_ip6 { 174 struct ip6_hdr uip6_ip6; 175 u_char uip6_init_done : 1; 176 } udp_ip6; 177 #endif /* INET6 */ 178 179 static void udp_append (struct inpcb *last, struct ip *ip, 180 struct mbuf *n, int off); 181 #ifdef INET6 182 static void ip_2_ip6_hdr (struct ip6_hdr *ip6, struct ip *ip); 183 #endif 184 185 static int udp_detach (struct socket *so); 186 static int udp_output (struct inpcb *, struct mbuf *, struct sockaddr *, 187 struct mbuf *, struct thread *); 188 189 void 190 udp_init(void) 191 { 192 in_pcbinfo_init(&udbinfo); 193 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask); 194 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB, 195 &udbinfo.porthashmask); 196 udbinfo.wildcardhashbase = hashinit(UDBHASHSIZE, M_PCB, 197 &udbinfo.wildcardhashmask); 198 udbinfo.ipi_zone = zinit("udpcb", sizeof(struct inpcb), maxsockets, 199 ZONE_INTERRUPT, 0); 200 udp_thread_init(); 201 } 202 203 /* 204 * Check multicast packets to make sure they are only sent to sockets with 205 * multicast memberships for the packet's destination address and arrival 206 * interface. Multicast packets to multicast-unaware sockets are also 207 * disallowed. 208 * 209 * Returns 0 if the packet is acceptable, -1 if it is not. 210 */ 211 static __inline int 212 check_multicast_membership(struct ip *ip, struct inpcb *inp, struct mbuf *m) 213 { 214 int mshipno; 215 struct ip_moptions *mopt; 216 217 if (strict_mcast_mship == 0 || 218 !IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 219 return (0); 220 } 221 mopt = inp->inp_moptions; 222 if (mopt == NULL) 223 return (-1); 224 for (mshipno = 0; mshipno <= mopt->imo_num_memberships; ++mshipno) { 225 struct in_multi *maddr = mopt->imo_membership[mshipno]; 226 227 if (ip->ip_dst.s_addr == maddr->inm_addr.s_addr && 228 m->m_pkthdr.rcvif == maddr->inm_ifp) { 229 return (0); 230 } 231 } 232 return (-1); 233 } 234 235 void 236 udp_input(struct mbuf *m, ...) 237 { 238 int iphlen; 239 struct ip *ip; 240 struct udphdr *uh; 241 struct inpcb *inp; 242 struct mbuf *opts = NULL; 243 int len, off, proto; 244 struct ip save_ip; 245 struct sockaddr *append_sa; 246 __va_list ap; 247 248 __va_start(ap, m); 249 off = __va_arg(ap, int); 250 proto = __va_arg(ap, int); 251 __va_end(ap); 252 253 iphlen = off; 254 udpstat.udps_ipackets++; 255 256 /* 257 * Strip IP options, if any; should skip this, 258 * make available to user, and use on returned packets, 259 * but we don't yet have a way to check the checksum 260 * with options still present. 261 */ 262 if (iphlen > sizeof(struct ip)) { 263 ip_stripoptions(m); 264 iphlen = sizeof(struct ip); 265 } 266 267 /* 268 * IP and UDP headers are together in first mbuf. 269 * Already checked and pulled up in ip_demux(). 270 */ 271 KASSERT(m->m_len >= iphlen + sizeof(struct udphdr), 272 ("UDP header not in one mbuf")); 273 274 ip = mtod(m, struct ip *); 275 uh = (struct udphdr *)((caddr_t)ip + iphlen); 276 277 /* destination port of 0 is illegal, based on RFC768. */ 278 if (uh->uh_dport == 0) 279 goto bad; 280 281 /* 282 * Make mbuf data length reflect UDP length. 283 * If not enough data to reflect UDP length, drop. 284 */ 285 len = ntohs((u_short)uh->uh_ulen); 286 if (ip->ip_len != len) { 287 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 288 udpstat.udps_badlen++; 289 goto bad; 290 } 291 m_adj(m, len - ip->ip_len); 292 /* ip->ip_len = len; */ 293 } 294 /* 295 * Save a copy of the IP header in case we want restore it 296 * for sending an ICMP error message in response. 297 */ 298 save_ip = *ip; 299 300 /* 301 * Checksum extended UDP header and data. 302 */ 303 if (uh->uh_sum) { 304 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 305 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 306 uh->uh_sum = m->m_pkthdr.csum_data; 307 else 308 uh->uh_sum = in_pseudo(ip->ip_src.s_addr, 309 ip->ip_dst.s_addr, htonl((u_short)len + 310 m->m_pkthdr.csum_data + IPPROTO_UDP)); 311 uh->uh_sum ^= 0xffff; 312 } else { 313 char b[9]; 314 315 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 316 bzero(((struct ipovly *)ip)->ih_x1, 9); 317 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 318 uh->uh_sum = in_cksum(m, len + sizeof(struct ip)); 319 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 320 } 321 if (uh->uh_sum) { 322 udpstat.udps_badsum++; 323 m_freem(m); 324 return; 325 } 326 } else 327 udpstat.udps_nosum++; 328 329 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 330 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { 331 struct inpcb *last; 332 333 /* 334 * Deliver a multicast or broadcast datagram to *all* sockets 335 * for which the local and remote addresses and ports match 336 * those of the incoming datagram. This allows more than 337 * one process to receive multi/broadcasts on the same port. 338 * (This really ought to be done for unicast datagrams as 339 * well, but that would cause problems with existing 340 * applications that open both address-specific sockets and 341 * a wildcard socket listening to the same port -- they would 342 * end up receiving duplicates of every unicast datagram. 343 * Those applications open the multiple sockets to overcome an 344 * inadequacy of the UDP socket interface, but for backwards 345 * compatibility we avoid the problem here rather than 346 * fixing the interface. Maybe 4.5BSD will remedy this?) 347 */ 348 349 /* 350 * Construct sockaddr format source address. 351 */ 352 udp_in.sin_port = uh->uh_sport; 353 udp_in.sin_addr = ip->ip_src; 354 /* 355 * Locate pcb(s) for datagram. 356 * (Algorithm copied from raw_intr().) 357 */ 358 last = NULL; 359 #ifdef INET6 360 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0; 361 #endif 362 LIST_FOREACH(inp, &udbinfo.pcblisthead, inp_list) { 363 if (inp->inp_flags & INP_PLACEMARKER) 364 continue; 365 #ifdef INET6 366 if (!(inp->inp_vflag & INP_IPV4)) 367 continue; 368 #endif 369 if (inp->inp_lport != uh->uh_dport) 370 continue; 371 if (inp->inp_laddr.s_addr != INADDR_ANY) { 372 if (inp->inp_laddr.s_addr != 373 ip->ip_dst.s_addr) 374 continue; 375 } 376 if (inp->inp_faddr.s_addr != INADDR_ANY) { 377 if (inp->inp_faddr.s_addr != 378 ip->ip_src.s_addr || 379 inp->inp_fport != uh->uh_sport) 380 continue; 381 } 382 383 if (check_multicast_membership(ip, inp, m) < 0) 384 continue; 385 386 if (last != NULL) { 387 struct mbuf *n; 388 389 #ifdef IPSEC 390 /* check AH/ESP integrity. */ 391 if (ipsec4_in_reject_so(m, last->inp_socket)) 392 ipsecstat.in_polvio++; 393 /* do not inject data to pcb */ 394 else 395 #endif /*IPSEC*/ 396 #ifdef FAST_IPSEC 397 /* check AH/ESP integrity. */ 398 if (ipsec4_in_reject(m, last)) 399 ; 400 else 401 #endif /*FAST_IPSEC*/ 402 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) 403 udp_append(last, ip, n, 404 iphlen + 405 sizeof(struct udphdr)); 406 } 407 last = inp; 408 /* 409 * Don't look for additional matches if this one does 410 * not have either the SO_REUSEPORT or SO_REUSEADDR 411 * socket options set. This heuristic avoids searching 412 * through all pcbs in the common case of a non-shared 413 * port. It * assumes that an application will never 414 * clear these options after setting them. 415 */ 416 if (!(last->inp_socket->so_options & 417 (SO_REUSEPORT | SO_REUSEADDR))) 418 break; 419 } 420 421 if (last == NULL) { 422 /* 423 * No matching pcb found; discard datagram. 424 * (No need to send an ICMP Port Unreachable 425 * for a broadcast or multicast datgram.) 426 */ 427 udpstat.udps_noportbcast++; 428 goto bad; 429 } 430 #ifdef IPSEC 431 /* check AH/ESP integrity. */ 432 if (ipsec4_in_reject_so(m, last->inp_socket)) { 433 ipsecstat.in_polvio++; 434 goto bad; 435 } 436 #endif /*IPSEC*/ 437 #ifdef FAST_IPSEC 438 /* check AH/ESP integrity. */ 439 if (ipsec4_in_reject(m, last)) 440 goto bad; 441 #endif /*FAST_IPSEC*/ 442 udp_append(last, ip, m, iphlen + sizeof(struct udphdr)); 443 return; 444 } 445 /* 446 * Locate pcb for datagram. 447 */ 448 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, 449 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 450 if (inp == NULL) { 451 if (log_in_vain) { 452 char buf[sizeof "aaa.bbb.ccc.ddd"]; 453 454 strcpy(buf, inet_ntoa(ip->ip_dst)); 455 log(LOG_INFO, 456 "Connection attempt to UDP %s:%d from %s:%d\n", 457 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 458 ntohs(uh->uh_sport)); 459 } 460 udpstat.udps_noport++; 461 if (m->m_flags & (M_BCAST | M_MCAST)) { 462 udpstat.udps_noportbcast++; 463 goto bad; 464 } 465 if (blackhole) 466 goto bad; 467 #ifdef ICMP_BANDLIM 468 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 469 goto bad; 470 #endif 471 *ip = save_ip; 472 ip->ip_len += iphlen; 473 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 474 return; 475 } 476 #ifdef IPSEC 477 if (ipsec4_in_reject_so(m, inp->inp_socket)) { 478 ipsecstat.in_polvio++; 479 goto bad; 480 } 481 #endif /*IPSEC*/ 482 #ifdef FAST_IPSEC 483 if (ipsec4_in_reject(m, inp)) 484 goto bad; 485 #endif /*FAST_IPSEC*/ 486 /* 487 * Check the minimum TTL for socket. 488 */ 489 if (ip->ip_ttl < inp->inp_ip_minttl) 490 goto bad; 491 492 /* 493 * Construct sockaddr format source address. 494 * Stuff source address and datagram in user buffer. 495 */ 496 udp_in.sin_port = uh->uh_sport; 497 udp_in.sin_addr = ip->ip_src; 498 if ((inp->inp_flags & INP_CONTROLOPTS) || 499 (inp->inp_socket->so_options & SO_TIMESTAMP)) { 500 #ifdef INET6 501 if (inp->inp_vflag & INP_IPV6) { 502 int savedflags; 503 504 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 505 savedflags = inp->inp_flags; 506 inp->inp_flags &= ~INP_UNMAPPABLEOPTS; 507 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m); 508 inp->inp_flags = savedflags; 509 } else 510 #endif 511 ip_savecontrol(inp, &opts, ip, m); 512 } 513 m_adj(m, iphlen + sizeof(struct udphdr)); 514 #ifdef INET6 515 if (inp->inp_vflag & INP_IPV6) { 516 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 517 append_sa = (struct sockaddr *)&udp_in6; 518 } else 519 #endif 520 append_sa = (struct sockaddr *)&udp_in; 521 if (ssb_appendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) { 522 udpstat.udps_fullsock++; 523 goto bad; 524 } 525 sorwakeup(inp->inp_socket); 526 return; 527 bad: 528 m_freem(m); 529 if (opts) 530 m_freem(opts); 531 return; 532 } 533 534 #ifdef INET6 535 static void 536 ip_2_ip6_hdr(struct ip6_hdr *ip6, struct ip *ip) 537 { 538 bzero(ip6, sizeof *ip6); 539 540 ip6->ip6_vfc = IPV6_VERSION; 541 ip6->ip6_plen = ip->ip_len; 542 ip6->ip6_nxt = ip->ip_p; 543 ip6->ip6_hlim = ip->ip_ttl; 544 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] = 545 IPV6_ADDR_INT32_SMP; 546 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr; 547 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr; 548 } 549 #endif 550 551 /* 552 * subroutine of udp_input(), mainly for source code readability. 553 * caller must properly init udp_ip6 and udp_in6 beforehand. 554 */ 555 static void 556 udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, int off) 557 { 558 struct sockaddr *append_sa; 559 struct mbuf *opts = NULL; 560 561 if (last->inp_flags & INP_CONTROLOPTS || 562 last->inp_socket->so_options & SO_TIMESTAMP) { 563 #ifdef INET6 564 if (last->inp_vflag & INP_IPV6) { 565 int savedflags; 566 567 if (udp_ip6.uip6_init_done == 0) { 568 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 569 udp_ip6.uip6_init_done = 1; 570 } 571 savedflags = last->inp_flags; 572 last->inp_flags &= ~INP_UNMAPPABLEOPTS; 573 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n); 574 last->inp_flags = savedflags; 575 } else 576 #endif 577 ip_savecontrol(last, &opts, ip, n); 578 } 579 #ifdef INET6 580 if (last->inp_vflag & INP_IPV6) { 581 if (udp_in6.uin6_init_done == 0) { 582 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 583 udp_in6.uin6_init_done = 1; 584 } 585 append_sa = (struct sockaddr *)&udp_in6.uin6_sin; 586 } else 587 #endif 588 append_sa = (struct sockaddr *)&udp_in; 589 m_adj(n, off); 590 if (ssb_appendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) { 591 m_freem(n); 592 if (opts) 593 m_freem(opts); 594 udpstat.udps_fullsock++; 595 } else 596 sorwakeup(last->inp_socket); 597 } 598 599 /* 600 * Notify a udp user of an asynchronous error; 601 * just wake up so that he can collect error status. 602 */ 603 void 604 udp_notify(struct inpcb *inp, int error) 605 { 606 inp->inp_socket->so_error = error; 607 sorwakeup(inp->inp_socket); 608 sowwakeup(inp->inp_socket); 609 } 610 611 void 612 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip) 613 { 614 struct ip *ip = vip; 615 struct udphdr *uh; 616 void (*notify) (struct inpcb *, int) = udp_notify; 617 struct in_addr faddr; 618 struct inpcb *inp; 619 620 faddr = ((struct sockaddr_in *)sa)->sin_addr; 621 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 622 return; 623 624 if (PRC_IS_REDIRECT(cmd)) { 625 ip = NULL; 626 notify = in_rtchange; 627 } else if (cmd == PRC_HOSTDEAD) 628 ip = NULL; 629 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 630 return; 631 if (ip) { 632 crit_enter(); 633 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 634 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport, 635 ip->ip_src, uh->uh_sport, 0, NULL); 636 if (inp != NULL && inp->inp_socket != NULL) 637 (*notify)(inp, inetctlerrmap[cmd]); 638 crit_exit(); 639 } else 640 in_pcbnotifyall(&udbinfo.pcblisthead, faddr, inetctlerrmap[cmd], 641 notify); 642 } 643 644 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, &udbinfo, 0, 645 in_pcblist_global, "S,xinpcb", "List of active UDP sockets"); 646 647 static int 648 udp_getcred(SYSCTL_HANDLER_ARGS) 649 { 650 struct sockaddr_in addrs[2]; 651 struct inpcb *inp; 652 int error; 653 654 error = suser(req->td); 655 if (error) 656 return (error); 657 error = SYSCTL_IN(req, addrs, sizeof addrs); 658 if (error) 659 return (error); 660 crit_enter(); 661 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 662 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 663 if (inp == NULL || inp->inp_socket == NULL) { 664 error = ENOENT; 665 goto out; 666 } 667 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(struct ucred)); 668 out: 669 crit_exit(); 670 return (error); 671 } 672 673 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 674 0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection"); 675 676 static int 677 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *dstaddr, 678 struct mbuf *control, struct thread *td) 679 { 680 struct udpiphdr *ui; 681 int len = m->m_pkthdr.len; 682 struct sockaddr_in *sin; /* really is initialized before use */ 683 int error = 0, lport_any = 0; 684 685 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 686 error = EMSGSIZE; 687 goto release; 688 } 689 690 if (inp->inp_lport == 0) { /* unbound socket */ 691 error = in_pcbbind(inp, (struct sockaddr *)NULL, td); 692 if (error) 693 goto release; 694 in_pcbinswildcardhash(inp); 695 lport_any = 1; 696 } 697 698 if (dstaddr != NULL) { /* destination address specified */ 699 if (inp->inp_faddr.s_addr != INADDR_ANY) { 700 /* already connected */ 701 error = EISCONN; 702 goto release; 703 } 704 sin = (struct sockaddr_in *)dstaddr; 705 if (!prison_remote_ip(td, (struct sockaddr *)&sin)) { 706 error = EAFNOSUPPORT; /* IPv6 only jail */ 707 goto release; 708 } 709 } else { 710 if (inp->inp_faddr.s_addr == INADDR_ANY) { 711 /* no destination specified and not already connected */ 712 error = ENOTCONN; 713 goto release; 714 } 715 sin = NULL; 716 } 717 718 /* 719 * Calculate data length and get a mbuf 720 * for UDP and IP headers. 721 */ 722 M_PREPEND(m, sizeof(struct udpiphdr), MB_DONTWAIT); 723 if (m == NULL) { 724 error = ENOBUFS; 725 goto release; 726 } 727 728 /* 729 * Fill in mbuf with extended UDP header 730 * and addresses and length put into network format. 731 */ 732 ui = mtod(m, struct udpiphdr *); 733 bzero(ui->ui_x1, sizeof ui->ui_x1); /* XXX still needed? */ 734 ui->ui_pr = IPPROTO_UDP; 735 736 /* 737 * Set destination address. 738 */ 739 if (dstaddr != NULL) { /* use specified destination */ 740 ui->ui_dst = sin->sin_addr; 741 ui->ui_dport = sin->sin_port; 742 } else { /* use connected destination */ 743 ui->ui_dst = inp->inp_faddr; 744 ui->ui_dport = inp->inp_fport; 745 } 746 747 /* 748 * Set source address. 749 */ 750 if (inp->inp_laddr.s_addr == INADDR_ANY) { 751 struct sockaddr_in *if_sin; 752 753 if (dstaddr == NULL) { 754 /* 755 * connect() had (or should have) failed because 756 * the interface had no IP address, but the 757 * application proceeded to call send() anyways. 758 */ 759 error = ENOTCONN; 760 goto release; 761 } 762 763 /* Look up outgoing interface. */ 764 if ((error = in_pcbladdr(inp, dstaddr, &if_sin, td))) 765 goto release; 766 ui->ui_src = if_sin->sin_addr; /* use address of interface */ 767 } else { 768 ui->ui_src = inp->inp_laddr; /* use non-null bound address */ 769 } 770 ui->ui_sport = inp->inp_lport; 771 KASSERT(inp->inp_lport != 0, ("inp lport should have been bound")); 772 773 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 774 775 /* 776 * Set up checksum and output datagram. 777 */ 778 if (udpcksum) { 779 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr, 780 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 781 m->m_pkthdr.csum_flags = CSUM_UDP; 782 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 783 } else { 784 ui->ui_sum = 0; 785 } 786 ((struct ip *)ui)->ip_len = sizeof(struct udpiphdr) + len; 787 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 788 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 789 udpstat.udps_opackets++; 790 791 error = ip_output(m, inp->inp_options, &inp->inp_route, 792 (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)) | 793 IP_DEBUGROUTE, 794 inp->inp_moptions, inp); 795 796 /* 797 * If this is the first data gram sent on an unbound and unconnected 798 * UDP socket, lport will be changed in this function. If target 799 * CPU after this lport changing is no longer the current CPU, then 800 * free the route entry allocated on the current CPU. 801 */ 802 if (lport_any) { 803 if (udp_addrcpu(inp->inp_faddr.s_addr, inp->inp_fport, 804 inp->inp_laddr.s_addr, inp->inp_lport) != mycpuid) { 805 struct route *ro = &inp->inp_route; 806 807 if (ro->ro_rt != NULL) 808 RTFREE(ro->ro_rt); 809 bzero(ro, sizeof(*ro)); 810 } 811 } 812 return (error); 813 814 release: 815 m_freem(m); 816 return (error); 817 } 818 819 u_long udp_sendspace = 9216; /* really max datagram size */ 820 /* 40 1K datagrams */ 821 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 822 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 823 824 u_long udp_recvspace = 40 * (1024 + 825 #ifdef INET6 826 sizeof(struct sockaddr_in6) 827 #else 828 sizeof(struct sockaddr_in) 829 #endif 830 ); 831 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 832 &udp_recvspace, 0, "Maximum incoming UDP datagram size"); 833 834 static int 835 udp_abort(struct socket *so) 836 { 837 struct inpcb *inp; 838 839 inp = so->so_pcb; 840 if (inp == NULL) 841 return EINVAL; /* ??? possible? panic instead? */ 842 soisdisconnected(so); 843 crit_enter(); 844 in_pcbdetach(inp); 845 crit_exit(); 846 return 0; 847 } 848 849 static int 850 udp_attach(struct socket *so, int proto, struct pru_attach_info *ai) 851 { 852 struct inpcb *inp; 853 int error; 854 855 inp = so->so_pcb; 856 if (inp != NULL) 857 return EINVAL; 858 859 error = soreserve(so, udp_sendspace, udp_recvspace, ai->sb_rlimit); 860 if (error) 861 return error; 862 crit_enter(); 863 error = in_pcballoc(so, &udbinfo); 864 crit_exit(); 865 if (error) 866 return error; 867 868 inp = (struct inpcb *)so->so_pcb; 869 inp->inp_vflag |= INP_IPV4; 870 inp->inp_ip_ttl = ip_defttl; 871 return 0; 872 } 873 874 static int 875 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 876 { 877 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 878 struct inpcb *inp; 879 int error; 880 881 inp = so->so_pcb; 882 if (inp == NULL) 883 return EINVAL; 884 crit_enter(); 885 error = in_pcbbind(inp, nam, td); 886 crit_exit(); 887 if (error == 0) { 888 if (sin->sin_addr.s_addr != INADDR_ANY) 889 inp->inp_flags |= INP_WASBOUND_NOTANY; 890 in_pcbinswildcardhash(inp); 891 } 892 return error; 893 } 894 895 static int 896 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 897 { 898 struct inpcb *inp; 899 int error; 900 901 inp = so->so_pcb; 902 if (inp == NULL) 903 return EINVAL; 904 if (inp->inp_faddr.s_addr != INADDR_ANY) 905 return EISCONN; 906 error = 0; 907 crit_enter(); 908 if (td->td_proc && td->td_proc->p_ucred->cr_prison != NULL && 909 inp->inp_laddr.s_addr == INADDR_ANY) { 910 error = in_pcbbind(inp, NULL, td); 911 } 912 if (error == 0) { 913 if (!prison_remote_ip(td, nam)) 914 return(EAFNOSUPPORT); /* IPv6 only jail */ 915 if (inp->inp_flags & INP_WILDCARD) 916 in_pcbremwildcardhash(inp); 917 error = in_pcbconnect(inp, nam, td); 918 } 919 crit_exit(); 920 if (error == 0) { 921 soisconnected(so); 922 923 /* 924 * Make sure that the new target CPU is same as current CPU, 925 * if it is not, then we will have to free the route entry 926 * allocated on the current CPU. 927 */ 928 if (udp_addrcpu(inp->inp_faddr.s_addr, inp->inp_fport, 929 inp->inp_laddr.s_addr, inp->inp_lport) != mycpuid) { 930 struct route *ro = &inp->inp_route; 931 932 if (ro->ro_rt != NULL) 933 RTFREE(ro->ro_rt); 934 bzero(ro, sizeof(*ro)); 935 } 936 } else if (error == EAFNOSUPPORT) { /* connection dissolved */ 937 /* 938 * Follow traditional BSD behavior and retain 939 * the local port binding. But, fix the old misbehavior 940 * of overwriting any previously bound local address. 941 */ 942 if (!(inp->inp_flags & INP_WASBOUND_NOTANY)) 943 inp->inp_laddr.s_addr = INADDR_ANY; 944 in_pcbinswildcardhash(inp); 945 } 946 return error; 947 } 948 949 static int 950 udp_detach(struct socket *so) 951 { 952 struct inpcb *inp; 953 954 inp = so->so_pcb; 955 if (inp == NULL) 956 return EINVAL; 957 crit_enter(); 958 in_pcbdetach(inp); 959 crit_exit(); 960 return 0; 961 } 962 963 static int 964 udp_disconnect(struct socket *so) 965 { 966 struct route *ro; 967 struct inpcb *inp; 968 969 inp = so->so_pcb; 970 if (inp == NULL) 971 return EINVAL; 972 if (inp->inp_faddr.s_addr == INADDR_ANY) 973 return ENOTCONN; 974 975 crit_enter(); 976 in_pcbdisconnect(inp); 977 crit_exit(); 978 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 979 980 ro = &inp->inp_route; 981 if (ro->ro_rt != NULL) 982 RTFREE(ro->ro_rt); 983 bzero(ro, sizeof(*ro)); 984 985 return 0; 986 } 987 988 static int 989 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 990 struct mbuf *control, struct thread *td) 991 { 992 struct inpcb *inp; 993 994 inp = so->so_pcb; 995 if (inp == NULL) { 996 m_freem(m); 997 return EINVAL; 998 } 999 return udp_output(inp, m, addr, control, td); 1000 } 1001 1002 int 1003 udp_shutdown(struct socket *so) 1004 { 1005 struct inpcb *inp; 1006 1007 inp = so->so_pcb; 1008 if (inp == NULL) 1009 return EINVAL; 1010 socantsendmore(so); 1011 return 0; 1012 } 1013 1014 struct pr_usrreqs udp_usrreqs = { 1015 .pru_abort = udp_abort, 1016 .pru_accept = pru_accept_notsupp, 1017 .pru_attach = udp_attach, 1018 .pru_bind = udp_bind, 1019 .pru_connect = udp_connect, 1020 .pru_connect2 = pru_connect2_notsupp, 1021 .pru_control = in_control, 1022 .pru_detach = udp_detach, 1023 .pru_disconnect = udp_disconnect, 1024 .pru_listen = pru_listen_notsupp, 1025 .pru_peeraddr = in_setpeeraddr, 1026 .pru_rcvd = pru_rcvd_notsupp, 1027 .pru_rcvoob = pru_rcvoob_notsupp, 1028 .pru_send = udp_send, 1029 .pru_sense = pru_sense_null, 1030 .pru_shutdown = udp_shutdown, 1031 .pru_sockaddr = in_setsockaddr, 1032 .pru_sosend = sosendudp, 1033 .pru_soreceive = soreceive, 1034 .pru_sopoll = sopoll 1035 }; 1036 1037