1 /* $OpenBSD: udp_usrreq.c,v 1.262 2020/08/22 17:54:57 gnezdo Exp $ */ 2 /* $NetBSD: udp_usrreq.c,v 1.28 1996/03/16 23:54:03 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1982, 1986, 1988, 1990, 1993 6 * The Regents of the University of California. All rights reserved. 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 University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)COPYRIGHT 1.1 (NRL) 17 January 1995 33 * 34 * NRL grants permission for redistribution and use in source and binary 35 * forms, with or without modification, of the software and documentation 36 * created at NRL provided that the following conditions are met: 37 * 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 3. All advertising materials mentioning features or use of this software 44 * must display the following acknowledgements: 45 * This product includes software developed by the University of 46 * California, Berkeley and its contributors. 47 * This product includes software developed at the Information 48 * Technology Division, US Naval Research Laboratory. 49 * 4. Neither the name of the NRL nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL AND CONTRIBUTORS ``AS 54 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 55 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 56 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NRL OR 57 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 58 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 59 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 60 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 61 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 62 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 63 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 64 * 65 * The views and conclusions contained in the software and documentation 66 * are those of the authors and should not be interpreted as representing 67 * official policies, either expressed or implied, of the US Naval 68 * Research Laboratory (NRL). 69 */ 70 71 #include <sys/param.h> 72 #include <sys/systm.h> 73 #include <sys/mbuf.h> 74 #include <sys/protosw.h> 75 #include <sys/socket.h> 76 #include <sys/socketvar.h> 77 #include <sys/sysctl.h> 78 #include <sys/domain.h> 79 80 #include <net/if.h> 81 #include <net/if_var.h> 82 #include <net/if_media.h> 83 #include <net/route.h> 84 85 #include <netinet/in.h> 86 #include <netinet/in_var.h> 87 #include <netinet/ip.h> 88 #include <netinet/in_pcb.h> 89 #include <netinet/ip_var.h> 90 #include <netinet/ip_icmp.h> 91 #include <netinet/udp.h> 92 #include <netinet/udp_var.h> 93 94 #ifdef IPSEC 95 #include <netinet/ip_ipsp.h> 96 #include <netinet/ip_esp.h> 97 #endif 98 99 #ifdef INET6 100 #include <netinet6/in6_var.h> 101 #include <netinet6/ip6_var.h> 102 #include <netinet6/ip6protosw.h> 103 #endif /* INET6 */ 104 105 #include "pf.h" 106 #if NPF > 0 107 #include <net/pfvar.h> 108 #endif 109 110 #ifdef PIPEX 111 #include <netinet/if_ether.h> 112 #include <net/pipex.h> 113 #endif 114 115 #include "vxlan.h" 116 #if NVXLAN > 0 117 #include <net/if_vxlan.h> 118 #endif 119 120 /* 121 * UDP protocol implementation. 122 * Per RFC 768, August, 1980. 123 */ 124 int udpcksum = 1; 125 126 u_int udp_sendspace = 9216; /* really max datagram size */ 127 u_int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); 128 /* 40 1K datagrams */ 129 130 const struct sysctl_bounded_args udpctl_vars[] = { 131 { UDPCTL_CHECKSUM, &udpcksum, 0, 1 }, 132 { UDPCTL_RECVSPACE, &udp_recvspace, 0, INT_MAX }, 133 { UDPCTL_SENDSPACE, &udp_sendspace, 0, INT_MAX }, 134 }; 135 136 struct inpcbtable udbtable; 137 struct cpumem *udpcounters; 138 139 void udp_sbappend(struct inpcb *, struct mbuf *, struct ip *, 140 struct ip6_hdr *, int, struct udphdr *, struct sockaddr *, 141 u_int32_t); 142 int udp_output(struct inpcb *, struct mbuf *, struct mbuf *, struct mbuf *); 143 void udp_notify(struct inpcb *, int); 144 int udp_sysctl_udpstat(void *, size_t *, void *); 145 146 #ifndef UDB_INITIAL_HASH_SIZE 147 #define UDB_INITIAL_HASH_SIZE 128 148 #endif 149 150 void 151 udp_init(void) 152 { 153 udpcounters = counters_alloc(udps_ncounters); 154 in_pcbinit(&udbtable, UDB_INITIAL_HASH_SIZE); 155 } 156 157 int 158 udp_input(struct mbuf **mp, int *offp, int proto, int af) 159 { 160 struct mbuf *m = *mp; 161 int iphlen = *offp; 162 struct ip *ip = NULL; 163 struct udphdr *uh; 164 struct inpcb *inp = NULL; 165 struct ip save_ip; 166 int len; 167 u_int16_t savesum; 168 union { 169 struct sockaddr sa; 170 struct sockaddr_in sin; 171 #ifdef INET6 172 struct sockaddr_in6 sin6; 173 #endif /* INET6 */ 174 } srcsa, dstsa; 175 struct ip6_hdr *ip6 = NULL; 176 #ifdef IPSEC 177 struct m_tag *mtag; 178 struct tdb_ident *tdbi; 179 struct tdb *tdb; 180 int error, protoff; 181 #endif /* IPSEC */ 182 u_int32_t ipsecflowinfo = 0; 183 184 udpstat_inc(udps_ipackets); 185 186 IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); 187 if (!uh) { 188 udpstat_inc(udps_hdrops); 189 return IPPROTO_DONE; 190 } 191 192 /* Check for illegal destination port 0 */ 193 if (uh->uh_dport == 0) { 194 udpstat_inc(udps_noport); 195 goto bad; 196 } 197 198 /* 199 * Make mbuf data length reflect UDP length. 200 * If not enough data to reflect UDP length, drop. 201 */ 202 len = ntohs((u_int16_t)uh->uh_ulen); 203 switch (af) { 204 case AF_INET: 205 if (m->m_pkthdr.len - iphlen != len) { 206 if (len > (m->m_pkthdr.len - iphlen) || 207 len < sizeof(struct udphdr)) { 208 udpstat_inc(udps_badlen); 209 goto bad; 210 } 211 m_adj(m, len - (m->m_pkthdr.len - iphlen)); 212 } 213 ip = mtod(m, struct ip *); 214 /* 215 * Save a copy of the IP header in case we want restore it 216 * for sending an ICMP error message in response. 217 */ 218 save_ip = *ip; 219 break; 220 #ifdef INET6 221 case AF_INET6: 222 /* jumbograms */ 223 if (len == 0 && m->m_pkthdr.len - iphlen > 0xffff) 224 len = m->m_pkthdr.len - iphlen; 225 if (len != m->m_pkthdr.len - iphlen) { 226 udpstat_inc(udps_badlen); 227 goto bad; 228 } 229 ip6 = mtod(m, struct ip6_hdr *); 230 break; 231 #endif /* INET6 */ 232 default: 233 unhandled_af(af); 234 } 235 236 /* 237 * Checksum extended UDP header and data. 238 * from W.R.Stevens: check incoming udp cksums even if 239 * udpcksum is not set. 240 */ 241 savesum = uh->uh_sum; 242 if (uh->uh_sum == 0) { 243 udpstat_inc(udps_nosum); 244 #ifdef INET6 245 /* 246 * In IPv6, the UDP checksum is ALWAYS used. 247 */ 248 if (ip6) 249 goto bad; 250 #endif /* INET6 */ 251 } else { 252 if ((m->m_pkthdr.csum_flags & M_UDP_CSUM_IN_OK) == 0) { 253 if (m->m_pkthdr.csum_flags & M_UDP_CSUM_IN_BAD) { 254 udpstat_inc(udps_badsum); 255 goto bad; 256 } 257 udpstat_inc(udps_inswcsum); 258 259 if (ip) 260 uh->uh_sum = in4_cksum(m, IPPROTO_UDP, 261 iphlen, len); 262 #ifdef INET6 263 else if (ip6) 264 uh->uh_sum = in6_cksum(m, IPPROTO_UDP, 265 iphlen, len); 266 #endif /* INET6 */ 267 if (uh->uh_sum != 0) { 268 udpstat_inc(udps_badsum); 269 goto bad; 270 } 271 } 272 } 273 274 #ifdef IPSEC 275 if (udpencap_enable && udpencap_port && esp_enable && 276 #if NPF > 0 277 !(m->m_pkthdr.pf.flags & PF_TAG_DIVERTED) && 278 #endif 279 uh->uh_dport == htons(udpencap_port)) { 280 u_int32_t spi; 281 int skip = iphlen + sizeof(struct udphdr); 282 283 if (m->m_pkthdr.len - skip < sizeof(u_int32_t)) { 284 /* packet too short */ 285 m_freem(m); 286 return IPPROTO_DONE; 287 } 288 m_copydata(m, skip, sizeof(u_int32_t), (caddr_t) &spi); 289 /* 290 * decapsulate if the SPI is not zero, otherwise pass 291 * to userland 292 */ 293 if (spi != 0) { 294 if ((m = *mp = m_pullup(m, skip)) == NULL) { 295 udpstat_inc(udps_hdrops); 296 return IPPROTO_DONE; 297 } 298 299 /* remove the UDP header */ 300 bcopy(mtod(m, u_char *), 301 mtod(m, u_char *) + sizeof(struct udphdr), iphlen); 302 m_adj(m, sizeof(struct udphdr)); 303 skip -= sizeof(struct udphdr); 304 305 espstat_inc(esps_udpencin); 306 protoff = af == AF_INET ? offsetof(struct ip, ip_p) : 307 offsetof(struct ip6_hdr, ip6_nxt); 308 ipsec_common_input(m, skip, protoff, 309 af, IPPROTO_ESP, 1); 310 return IPPROTO_DONE; 311 } 312 } 313 #endif 314 315 switch (af) { 316 case AF_INET: 317 bzero(&srcsa, sizeof(struct sockaddr_in)); 318 srcsa.sin.sin_len = sizeof(struct sockaddr_in); 319 srcsa.sin.sin_family = AF_INET; 320 srcsa.sin.sin_port = uh->uh_sport; 321 srcsa.sin.sin_addr = ip->ip_src; 322 323 bzero(&dstsa, sizeof(struct sockaddr_in)); 324 dstsa.sin.sin_len = sizeof(struct sockaddr_in); 325 dstsa.sin.sin_family = AF_INET; 326 dstsa.sin.sin_port = uh->uh_dport; 327 dstsa.sin.sin_addr = ip->ip_dst; 328 break; 329 #ifdef INET6 330 case AF_INET6: 331 bzero(&srcsa, sizeof(struct sockaddr_in6)); 332 srcsa.sin6.sin6_len = sizeof(struct sockaddr_in6); 333 srcsa.sin6.sin6_family = AF_INET6; 334 srcsa.sin6.sin6_port = uh->uh_sport; 335 #if 0 /*XXX inbound flowinfo */ 336 srcsa.sin6.sin6_flowinfo = htonl(0x0fffffff) & ip6->ip6_flow; 337 #endif 338 /* KAME hack: recover scopeid */ 339 in6_recoverscope(&srcsa.sin6, &ip6->ip6_src); 340 341 bzero(&dstsa, sizeof(struct sockaddr_in6)); 342 dstsa.sin6.sin6_len = sizeof(struct sockaddr_in6); 343 dstsa.sin6.sin6_family = AF_INET6; 344 dstsa.sin6.sin6_port = uh->uh_dport; 345 #if 0 /*XXX inbound flowinfo */ 346 dstsa.sin6.sin6_flowinfo = htonl(0x0fffffff) & ip6->ip6_flow; 347 #endif 348 /* KAME hack: recover scopeid */ 349 in6_recoverscope(&dstsa.sin6, &ip6->ip6_dst); 350 break; 351 #endif /* INET6 */ 352 } 353 354 #if NVXLAN > 0 355 if (vxlan_enable > 0 && 356 #if NPF > 0 357 !(m->m_pkthdr.pf.flags & PF_TAG_DIVERTED) && 358 #endif 359 vxlan_lookup(m, uh, iphlen, &srcsa.sa, &dstsa.sa) != 0) 360 return IPPROTO_DONE; 361 #endif 362 363 if (m->m_flags & (M_BCAST|M_MCAST)) { 364 struct inpcb *last; 365 /* 366 * Deliver a multicast or broadcast datagram to *all* sockets 367 * for which the local and remote addresses and ports match 368 * those of the incoming datagram. This allows more than 369 * one process to receive multi/broadcasts on the same port. 370 * (This really ought to be done for unicast datagrams as 371 * well, but that would cause problems with existing 372 * applications that open both address-specific sockets and 373 * a wildcard socket listening to the same port -- they would 374 * end up receiving duplicates of every unicast datagram. 375 * Those applications open the multiple sockets to overcome an 376 * inadequacy of the UDP socket interface, but for backwards 377 * compatibility we avoid the problem here rather than 378 * fixing the interface. Maybe 4.5BSD will remedy this?) 379 */ 380 381 /* 382 * Locate pcb(s) for datagram. 383 * (Algorithm copied from raw_intr().) 384 */ 385 last = NULL; 386 NET_ASSERT_LOCKED(); 387 TAILQ_FOREACH(inp, &udbtable.inpt_queue, inp_queue) { 388 if (inp->inp_socket->so_state & SS_CANTRCVMORE) 389 continue; 390 #ifdef INET6 391 /* don't accept it if AF does not match */ 392 if (ip6 && !(inp->inp_flags & INP_IPV6)) 393 continue; 394 if (!ip6 && (inp->inp_flags & INP_IPV6)) 395 continue; 396 #endif 397 if (rtable_l2(inp->inp_rtableid) != 398 rtable_l2(m->m_pkthdr.ph_rtableid)) 399 continue; 400 if (inp->inp_lport != uh->uh_dport) 401 continue; 402 #ifdef INET6 403 if (ip6) { 404 if (inp->inp_ip6_minhlim && 405 inp->inp_ip6_minhlim > ip6->ip6_hlim) 406 continue; 407 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6)) 408 if (!IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, 409 &ip6->ip6_dst)) 410 continue; 411 } else 412 #endif /* INET6 */ 413 { 414 if (inp->inp_ip_minttl && 415 inp->inp_ip_minttl > ip->ip_ttl) 416 continue; 417 418 if (inp->inp_laddr.s_addr != INADDR_ANY) { 419 if (inp->inp_laddr.s_addr != 420 ip->ip_dst.s_addr) 421 continue; 422 } 423 } 424 #ifdef INET6 425 if (ip6) { 426 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) 427 if (!IN6_ARE_ADDR_EQUAL(&inp->inp_faddr6, 428 &ip6->ip6_src) || 429 inp->inp_fport != uh->uh_sport) 430 continue; 431 } else 432 #endif /* INET6 */ 433 if (inp->inp_faddr.s_addr != INADDR_ANY) { 434 if (inp->inp_faddr.s_addr != 435 ip->ip_src.s_addr || 436 inp->inp_fport != uh->uh_sport) 437 continue; 438 } 439 440 if (last != NULL) { 441 struct mbuf *n; 442 443 n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 444 if (n != NULL) { 445 udp_sbappend(last, n, ip, ip6, iphlen, 446 uh, &srcsa.sa, 0); 447 } 448 } 449 last = inp; 450 /* 451 * Don't look for additional matches if this one does 452 * not have either the SO_REUSEPORT or SO_REUSEADDR 453 * socket options set. This heuristic avoids searching 454 * through all pcbs in the common case of a non-shared 455 * port. It assumes that an application will never 456 * clear these options after setting them. 457 */ 458 if ((last->inp_socket->so_options & (SO_REUSEPORT | 459 SO_REUSEADDR)) == 0) 460 break; 461 } 462 463 if (last == NULL) { 464 /* 465 * No matching pcb found; discard datagram. 466 * (No need to send an ICMP Port Unreachable 467 * for a broadcast or multicast datgram.) 468 */ 469 udpstat_inc(udps_noportbcast); 470 goto bad; 471 } 472 473 udp_sbappend(last, m, ip, ip6, iphlen, uh, &srcsa.sa, 0); 474 return IPPROTO_DONE; 475 } 476 /* 477 * Locate pcb for datagram. 478 */ 479 #if NPF > 0 480 inp = pf_inp_lookup(m); 481 #endif 482 if (inp == NULL) { 483 #ifdef INET6 484 if (ip6) 485 inp = in6_pcbhashlookup(&udbtable, &ip6->ip6_src, 486 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 487 m->m_pkthdr.ph_rtableid); 488 else 489 #endif /* INET6 */ 490 inp = in_pcbhashlookup(&udbtable, ip->ip_src, uh->uh_sport, 491 ip->ip_dst, uh->uh_dport, m->m_pkthdr.ph_rtableid); 492 } 493 if (inp == NULL) { 494 udpstat_inc(udps_pcbhashmiss); 495 #ifdef INET6 496 if (ip6) { 497 inp = in6_pcblookup_listen(&udbtable, &ip6->ip6_dst, 498 uh->uh_dport, m, m->m_pkthdr.ph_rtableid); 499 } else 500 #endif /* INET6 */ 501 inp = in_pcblookup_listen(&udbtable, ip->ip_dst, 502 uh->uh_dport, m, m->m_pkthdr.ph_rtableid); 503 } 504 505 #ifdef IPSEC 506 if (ipsec_in_use) { 507 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 508 if (mtag != NULL) { 509 tdbi = (struct tdb_ident *)(mtag + 1); 510 tdb = gettdb(tdbi->rdomain, tdbi->spi, 511 &tdbi->dst, tdbi->proto); 512 } else 513 tdb = NULL; 514 ipsp_spd_lookup(m, af, iphlen, &error, 515 IPSP_DIRECTION_IN, tdb, inp, 0); 516 if (error) { 517 udpstat_inc(udps_nosec); 518 goto bad; 519 } 520 /* create ipsec options while we know that tdb cannot be modified */ 521 if (tdb && tdb->tdb_ids) 522 ipsecflowinfo = tdb->tdb_ids->id_flow; 523 } 524 #endif /*IPSEC */ 525 526 if (inp == NULL) { 527 udpstat_inc(udps_noport); 528 if (m->m_flags & (M_BCAST | M_MCAST)) { 529 udpstat_inc(udps_noportbcast); 530 goto bad; 531 } 532 #ifdef INET6 533 if (ip6) { 534 uh->uh_sum = savesum; 535 icmp6_error(m, ICMP6_DST_UNREACH, 536 ICMP6_DST_UNREACH_NOPORT,0); 537 } else 538 #endif /* INET6 */ 539 { 540 *ip = save_ip; 541 uh->uh_sum = savesum; 542 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 543 0, 0); 544 } 545 return IPPROTO_DONE; 546 } 547 548 KASSERT(sotoinpcb(inp->inp_socket) == inp); 549 soassertlocked(inp->inp_socket); 550 551 #ifdef INET6 552 if (ip6 && inp->inp_ip6_minhlim && 553 inp->inp_ip6_minhlim > ip6->ip6_hlim) { 554 goto bad; 555 } else 556 #endif 557 if (ip && inp->inp_ip_minttl && 558 inp->inp_ip_minttl > ip->ip_ttl) { 559 goto bad; 560 } 561 562 #if NPF > 0 563 if (inp->inp_socket->so_state & SS_ISCONNECTED) 564 pf_inp_link(m, inp); 565 #endif 566 567 #ifdef PIPEX 568 if (pipex_enable && inp->inp_pipex) { 569 struct pipex_session *session; 570 int off = iphlen + sizeof(struct udphdr); 571 if ((session = pipex_l2tp_lookup_session(m, off)) != NULL) { 572 if ((m = *mp = pipex_l2tp_input(m, off, session, 573 ipsecflowinfo)) == NULL) { 574 /* the packet is handled by PIPEX */ 575 return IPPROTO_DONE; 576 } 577 } 578 } 579 #endif 580 581 udp_sbappend(inp, m, ip, ip6, iphlen, uh, &srcsa.sa, ipsecflowinfo); 582 return IPPROTO_DONE; 583 bad: 584 m_freem(m); 585 return IPPROTO_DONE; 586 } 587 588 void 589 udp_sbappend(struct inpcb *inp, struct mbuf *m, struct ip *ip, 590 struct ip6_hdr *ip6, int hlen, struct udphdr *uh, 591 struct sockaddr *srcaddr, u_int32_t ipsecflowinfo) 592 { 593 struct socket *so = inp->inp_socket; 594 struct mbuf *opts = NULL; 595 596 hlen += sizeof(*uh); 597 598 if (inp->inp_upcall != NULL) { 599 m = (*inp->inp_upcall)(inp->inp_upcall_arg, m, 600 ip, ip6, uh, hlen); 601 if (m == NULL) 602 return; 603 } 604 605 #ifdef INET6 606 if (ip6 && (inp->inp_flags & IN6P_CONTROLOPTS || 607 so->so_options & SO_TIMESTAMP)) 608 ip6_savecontrol(inp, m, &opts); 609 #endif /* INET6 */ 610 if (ip && (inp->inp_flags & INP_CONTROLOPTS || 611 so->so_options & SO_TIMESTAMP)) 612 ip_savecontrol(inp, &opts, ip, m); 613 #ifdef INET6 614 if (ip6 && (inp->inp_flags & IN6P_RECVDSTPORT)) { 615 struct mbuf **mp = &opts; 616 617 while (*mp) 618 mp = &(*mp)->m_next; 619 *mp = sbcreatecontrol((caddr_t)&uh->uh_dport, sizeof(u_int16_t), 620 IPV6_RECVDSTPORT, IPPROTO_IPV6); 621 } 622 #endif /* INET6 */ 623 if (ip && (inp->inp_flags & INP_RECVDSTPORT)) { 624 struct mbuf **mp = &opts; 625 626 while (*mp) 627 mp = &(*mp)->m_next; 628 *mp = sbcreatecontrol((caddr_t)&uh->uh_dport, sizeof(u_int16_t), 629 IP_RECVDSTPORT, IPPROTO_IP); 630 } 631 #ifdef IPSEC 632 if (ipsecflowinfo && (inp->inp_flags & INP_IPSECFLOWINFO)) { 633 struct mbuf **mp = &opts; 634 635 while (*mp) 636 mp = &(*mp)->m_next; 637 *mp = sbcreatecontrol((caddr_t)&ipsecflowinfo, 638 sizeof(u_int32_t), IP_IPSECFLOWINFO, IPPROTO_IP); 639 } 640 #endif 641 m_adj(m, hlen); 642 if (sbappendaddr(so, &so->so_rcv, srcaddr, m, opts) == 0) { 643 udpstat_inc(udps_fullsock); 644 m_freem(m); 645 m_freem(opts); 646 return; 647 } 648 sorwakeup(so); 649 } 650 651 /* 652 * Notify a udp user of an asynchronous error; 653 * just wake up so that he can collect error status. 654 */ 655 void 656 udp_notify(struct inpcb *inp, int errno) 657 { 658 inp->inp_socket->so_error = errno; 659 sorwakeup(inp->inp_socket); 660 sowwakeup(inp->inp_socket); 661 } 662 663 #ifdef INET6 664 void 665 udp6_ctlinput(int cmd, struct sockaddr *sa, u_int rdomain, void *d) 666 { 667 struct udphdr uh; 668 struct sockaddr_in6 sa6; 669 struct ip6_hdr *ip6; 670 struct mbuf *m; 671 int off; 672 void *cmdarg; 673 struct ip6ctlparam *ip6cp = NULL; 674 struct udp_portonly { 675 u_int16_t uh_sport; 676 u_int16_t uh_dport; 677 } *uhp; 678 void (*notify)(struct inpcb *, int) = udp_notify; 679 680 if (sa == NULL) 681 return; 682 if (sa->sa_family != AF_INET6 || 683 sa->sa_len != sizeof(struct sockaddr_in6)) 684 return; 685 686 if ((unsigned)cmd >= PRC_NCMDS) 687 return; 688 if (PRC_IS_REDIRECT(cmd)) 689 notify = in_rtchange, d = NULL; 690 else if (cmd == PRC_HOSTDEAD) 691 d = NULL; 692 else if (cmd == PRC_MSGSIZE) 693 ; /* special code is present, see below */ 694 else if (inet6ctlerrmap[cmd] == 0) 695 return; 696 697 /* if the parameter is from icmp6, decode it. */ 698 if (d != NULL) { 699 ip6cp = (struct ip6ctlparam *)d; 700 m = ip6cp->ip6c_m; 701 ip6 = ip6cp->ip6c_ip6; 702 off = ip6cp->ip6c_off; 703 cmdarg = ip6cp->ip6c_cmdarg; 704 } else { 705 m = NULL; 706 ip6 = NULL; 707 cmdarg = NULL; 708 /* XXX: translate addresses into internal form */ 709 sa6 = *satosin6(sa); 710 if (in6_embedscope(&sa6.sin6_addr, &sa6, NULL)) { 711 /* should be impossible */ 712 return; 713 } 714 } 715 716 if (ip6cp && ip6cp->ip6c_finaldst) { 717 bzero(&sa6, sizeof(sa6)); 718 sa6.sin6_family = AF_INET6; 719 sa6.sin6_len = sizeof(sa6); 720 sa6.sin6_addr = *ip6cp->ip6c_finaldst; 721 /* XXX: assuming M is valid in this case */ 722 sa6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.ph_ifidx, 723 ip6cp->ip6c_finaldst); 724 if (in6_embedscope(ip6cp->ip6c_finaldst, &sa6, NULL)) { 725 /* should be impossible */ 726 return; 727 } 728 } else { 729 /* XXX: translate addresses into internal form */ 730 sa6 = *satosin6(sa); 731 if (in6_embedscope(&sa6.sin6_addr, &sa6, NULL)) { 732 /* should be impossible */ 733 return; 734 } 735 } 736 737 if (ip6) { 738 /* 739 * XXX: We assume that when IPV6 is non NULL, 740 * M and OFF are valid. 741 */ 742 struct sockaddr_in6 sa6_src; 743 744 /* check if we can safely examine src and dst ports */ 745 if (m->m_pkthdr.len < off + sizeof(*uhp)) 746 return; 747 748 bzero(&uh, sizeof(uh)); 749 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 750 751 bzero(&sa6_src, sizeof(sa6_src)); 752 sa6_src.sin6_family = AF_INET6; 753 sa6_src.sin6_len = sizeof(sa6_src); 754 sa6_src.sin6_addr = ip6->ip6_src; 755 sa6_src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.ph_ifidx, 756 &ip6->ip6_src); 757 if (in6_embedscope(&sa6_src.sin6_addr, &sa6_src, NULL)) { 758 /* should be impossible */ 759 return; 760 } 761 762 if (cmd == PRC_MSGSIZE) { 763 int valid = 0; 764 765 /* 766 * Check to see if we have a valid UDP socket 767 * corresponding to the address in the ICMPv6 message 768 * payload. 769 */ 770 if (in6_pcbhashlookup(&udbtable, &sa6.sin6_addr, 771 uh.uh_dport, &sa6_src.sin6_addr, uh.uh_sport, 772 rdomain)) 773 valid = 1; 774 #if 0 775 /* 776 * As the use of sendto(2) is fairly popular, 777 * we may want to allow non-connected pcb too. 778 * But it could be too weak against attacks... 779 * We should at least check if the local address (= s) 780 * is really ours. 781 */ 782 else if (in6_pcblookup_listen(&udbtable, 783 &sa6_src.sin6_addr, uh.uh_sport, NULL, 784 rdomain)) 785 valid = 1; 786 #endif 787 788 /* 789 * Depending on the value of "valid" and routing table 790 * size (mtudisc_{hi,lo}wat), we will: 791 * - recalculate the new MTU and create the 792 * corresponding routing entry, or 793 * - ignore the MTU change notification. 794 */ 795 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 796 797 /* 798 * regardless of if we called icmp6_mtudisc_update(), 799 * we need to call in6_pcbnotify(), to notify path 800 * MTU change to the userland (2292bis-02), because 801 * some unconnected sockets may share the same 802 * destination and want to know the path MTU. 803 */ 804 } 805 806 (void) in6_pcbnotify(&udbtable, &sa6, uh.uh_dport, 807 &sa6_src, uh.uh_sport, rdomain, cmd, cmdarg, notify); 808 } else { 809 (void) in6_pcbnotify(&udbtable, &sa6, 0, 810 &sa6_any, 0, rdomain, cmd, cmdarg, notify); 811 } 812 } 813 #endif 814 815 void 816 udp_ctlinput(int cmd, struct sockaddr *sa, u_int rdomain, void *v) 817 { 818 struct ip *ip = v; 819 struct udphdr *uhp; 820 struct in_addr faddr; 821 struct inpcb *inp; 822 void (*notify)(struct inpcb *, int) = udp_notify; 823 int errno; 824 825 if (sa == NULL) 826 return; 827 if (sa->sa_family != AF_INET || 828 sa->sa_len != sizeof(struct sockaddr_in)) 829 return; 830 faddr = satosin(sa)->sin_addr; 831 if (faddr.s_addr == INADDR_ANY) 832 return; 833 834 if ((unsigned)cmd >= PRC_NCMDS) 835 return; 836 errno = inetctlerrmap[cmd]; 837 if (PRC_IS_REDIRECT(cmd)) 838 notify = in_rtchange, ip = 0; 839 else if (cmd == PRC_HOSTDEAD) 840 ip = 0; 841 else if (errno == 0) 842 return; 843 if (ip) { 844 uhp = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 845 846 #ifdef IPSEC 847 /* PMTU discovery for udpencap */ 848 if (cmd == PRC_MSGSIZE && ip_mtudisc && udpencap_enable && 849 udpencap_port && uhp->uh_sport == htons(udpencap_port)) { 850 udpencap_ctlinput(cmd, sa, rdomain, v); 851 return; 852 } 853 #endif 854 inp = in_pcbhashlookup(&udbtable, 855 ip->ip_dst, uhp->uh_dport, ip->ip_src, uhp->uh_sport, 856 rdomain); 857 if (inp && inp->inp_socket != NULL) 858 notify(inp, errno); 859 } else 860 in_pcbnotifyall(&udbtable, sa, rdomain, errno, notify); 861 } 862 863 int 864 udp_output(struct inpcb *inp, struct mbuf *m, struct mbuf *addr, 865 struct mbuf *control) 866 { 867 struct sockaddr_in *sin = NULL; 868 struct udpiphdr *ui; 869 u_int32_t ipsecflowinfo = 0; 870 struct sockaddr_in src_sin; 871 int len = m->m_pkthdr.len; 872 struct in_addr *laddr; 873 int error = 0; 874 875 #ifdef DIAGNOSTIC 876 if ((inp->inp_flags & INP_IPV6) != 0) 877 panic("IPv6 inpcb to %s", __func__); 878 #endif 879 880 /* 881 * Compute the packet length of the IP header, and 882 * punt if the length looks bogus. 883 */ 884 if ((len + sizeof(struct udpiphdr)) > IP_MAXPACKET) { 885 error = EMSGSIZE; 886 goto release; 887 } 888 889 memset(&src_sin, 0, sizeof(src_sin)); 890 891 if (control) { 892 u_int clen; 893 struct cmsghdr *cm; 894 caddr_t cmsgs; 895 896 /* 897 * XXX: Currently, we assume all the optional information is 898 * stored in a single mbuf. 899 */ 900 if (control->m_next) { 901 error = EINVAL; 902 goto release; 903 } 904 905 clen = control->m_len; 906 cmsgs = mtod(control, caddr_t); 907 do { 908 if (clen < CMSG_LEN(0)) { 909 error = EINVAL; 910 goto release; 911 } 912 cm = (struct cmsghdr *)cmsgs; 913 if (cm->cmsg_len < CMSG_LEN(0) || 914 CMSG_ALIGN(cm->cmsg_len) > clen) { 915 error = EINVAL; 916 goto release; 917 } 918 #ifdef IPSEC 919 if ((inp->inp_flags & INP_IPSECFLOWINFO) != 0 && 920 cm->cmsg_len == CMSG_LEN(sizeof(ipsecflowinfo)) && 921 cm->cmsg_level == IPPROTO_IP && 922 cm->cmsg_type == IP_IPSECFLOWINFO) { 923 ipsecflowinfo = *(u_int32_t *)CMSG_DATA(cm); 924 } else 925 #endif 926 if (cm->cmsg_len == CMSG_LEN(sizeof(struct in_addr)) && 927 cm->cmsg_level == IPPROTO_IP && 928 cm->cmsg_type == IP_SENDSRCADDR) { 929 memcpy(&src_sin.sin_addr, CMSG_DATA(cm), 930 sizeof(struct in_addr)); 931 src_sin.sin_family = AF_INET; 932 src_sin.sin_len = sizeof(src_sin); 933 /* no check on reuse when sin->sin_port == 0 */ 934 if ((error = in_pcbaddrisavail(inp, &src_sin, 935 0, curproc))) 936 goto release; 937 } 938 clen -= CMSG_ALIGN(cm->cmsg_len); 939 cmsgs += CMSG_ALIGN(cm->cmsg_len); 940 } while (clen); 941 } 942 943 if (addr) { 944 if ((error = in_nam2sin(addr, &sin))) 945 goto release; 946 if (sin->sin_port == 0) { 947 error = EADDRNOTAVAIL; 948 goto release; 949 } 950 if (inp->inp_faddr.s_addr != INADDR_ANY) { 951 error = EISCONN; 952 goto release; 953 } 954 error = in_pcbselsrc(&laddr, sin, inp); 955 if (error) 956 goto release; 957 958 if (inp->inp_lport == 0) { 959 error = in_pcbbind(inp, NULL, curproc); 960 if (error) 961 goto release; 962 } 963 964 if (src_sin.sin_len > 0 && 965 src_sin.sin_addr.s_addr != INADDR_ANY && 966 src_sin.sin_addr.s_addr != inp->inp_laddr.s_addr) { 967 src_sin.sin_port = inp->inp_lport; 968 if (inp->inp_laddr.s_addr != INADDR_ANY && 969 (error = 970 in_pcbaddrisavail(inp, &src_sin, 0, curproc))) 971 goto release; 972 laddr = &src_sin.sin_addr; 973 } 974 } else { 975 if (inp->inp_faddr.s_addr == INADDR_ANY) { 976 error = ENOTCONN; 977 goto release; 978 } 979 laddr = &inp->inp_laddr; 980 } 981 982 /* 983 * Calculate data length and get a mbuf 984 * for UDP and IP headers. 985 */ 986 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 987 if (m == NULL) { 988 error = ENOBUFS; 989 goto bail; 990 } 991 992 /* 993 * Fill in mbuf with extended UDP header 994 * and addresses and length put into network format. 995 */ 996 ui = mtod(m, struct udpiphdr *); 997 bzero(ui->ui_x1, sizeof ui->ui_x1); 998 ui->ui_pr = IPPROTO_UDP; 999 ui->ui_len = htons((u_int16_t)len + sizeof (struct udphdr)); 1000 ui->ui_src = *laddr; 1001 ui->ui_dst = sin ? sin->sin_addr : inp->inp_faddr; 1002 ui->ui_sport = inp->inp_lport; 1003 ui->ui_dport = sin ? sin->sin_port : inp->inp_fport; 1004 ui->ui_ulen = ui->ui_len; 1005 ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); 1006 ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; 1007 ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; 1008 if (udpcksum) 1009 m->m_pkthdr.csum_flags |= M_UDP_CSUM_OUT; 1010 1011 udpstat_inc(udps_opackets); 1012 1013 /* force routing table */ 1014 m->m_pkthdr.ph_rtableid = inp->inp_rtableid; 1015 1016 #if NPF > 0 1017 if (inp->inp_socket->so_state & SS_ISCONNECTED) 1018 pf_mbuf_link_inpcb(m, inp); 1019 #endif 1020 1021 error = ip_output(m, inp->inp_options, &inp->inp_route, 1022 (inp->inp_socket->so_options & SO_BROADCAST), inp->inp_moptions, 1023 inp, ipsecflowinfo); 1024 1025 bail: 1026 m_freem(control); 1027 return (error); 1028 1029 release: 1030 m_freem(m); 1031 goto bail; 1032 } 1033 1034 /*ARGSUSED*/ 1035 int 1036 udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *addr, 1037 struct mbuf *control, struct proc *p) 1038 { 1039 struct inpcb *inp; 1040 int error = 0; 1041 1042 if (req == PRU_CONTROL) { 1043 #ifdef INET6 1044 if (sotopf(so) == PF_INET6) 1045 return (in6_control(so, (u_long)m, (caddr_t)addr, 1046 (struct ifnet *)control)); 1047 else 1048 #endif /* INET6 */ 1049 return (in_control(so, (u_long)m, (caddr_t)addr, 1050 (struct ifnet *)control)); 1051 } 1052 1053 soassertlocked(so); 1054 1055 inp = sotoinpcb(so); 1056 if (inp == NULL) { 1057 error = EINVAL; 1058 goto release; 1059 } 1060 1061 /* 1062 * Note: need to block udp_input while changing 1063 * the udp pcb queue and/or pcb addresses. 1064 */ 1065 switch (req) { 1066 1067 case PRU_BIND: 1068 error = in_pcbbind(inp, addr, p); 1069 break; 1070 1071 case PRU_LISTEN: 1072 error = EOPNOTSUPP; 1073 break; 1074 1075 case PRU_CONNECT: 1076 #ifdef INET6 1077 if (inp->inp_flags & INP_IPV6) { 1078 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) { 1079 error = EISCONN; 1080 break; 1081 } 1082 error = in6_pcbconnect(inp, addr); 1083 } else 1084 #endif /* INET6 */ 1085 { 1086 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1087 error = EISCONN; 1088 break; 1089 } 1090 error = in_pcbconnect(inp, addr); 1091 } 1092 1093 if (error == 0) 1094 soisconnected(so); 1095 break; 1096 1097 case PRU_CONNECT2: 1098 error = EOPNOTSUPP; 1099 break; 1100 1101 case PRU_ACCEPT: 1102 error = EOPNOTSUPP; 1103 break; 1104 1105 case PRU_DISCONNECT: 1106 #ifdef INET6 1107 if (inp->inp_flags & INP_IPV6) { 1108 if (IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) { 1109 error = ENOTCONN; 1110 break; 1111 } 1112 } else 1113 #endif /* INET6 */ 1114 { 1115 if (inp->inp_faddr.s_addr == INADDR_ANY) { 1116 error = ENOTCONN; 1117 break; 1118 } 1119 } 1120 1121 #ifdef INET6 1122 if (inp->inp_flags & INP_IPV6) 1123 inp->inp_laddr6 = in6addr_any; 1124 else 1125 #endif /* INET6 */ 1126 inp->inp_laddr.s_addr = INADDR_ANY; 1127 in_pcbdisconnect(inp); 1128 1129 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1130 break; 1131 1132 case PRU_SHUTDOWN: 1133 socantsendmore(so); 1134 break; 1135 1136 case PRU_SEND: 1137 #ifdef PIPEX 1138 if (inp->inp_pipex) { 1139 struct pipex_session *session; 1140 1141 if (addr != NULL) 1142 session = 1143 pipex_l2tp_userland_lookup_session(m, 1144 mtod(addr, struct sockaddr *)); 1145 else 1146 #ifdef INET6 1147 if (inp->inp_flags & INP_IPV6) 1148 session = 1149 pipex_l2tp_userland_lookup_session_ipv6( 1150 m, inp->inp_faddr6); 1151 else 1152 #endif 1153 session = 1154 pipex_l2tp_userland_lookup_session_ipv4( 1155 m, inp->inp_faddr); 1156 if (session != NULL) 1157 if ((m = pipex_l2tp_userland_output( 1158 m, session)) == NULL) { 1159 error = ENOMEM; 1160 goto release; 1161 } 1162 } 1163 #endif 1164 1165 #ifdef INET6 1166 if (inp->inp_flags & INP_IPV6) 1167 error = udp6_output(inp, m, addr, control); 1168 else 1169 #endif 1170 error = udp_output(inp, m, addr, control); 1171 return (error); 1172 1173 case PRU_ABORT: 1174 soisdisconnected(so); 1175 in_pcbdetach(inp); 1176 break; 1177 1178 case PRU_SOCKADDR: 1179 #ifdef INET6 1180 if (inp->inp_flags & INP_IPV6) 1181 in6_setsockaddr(inp, addr); 1182 else 1183 #endif /* INET6 */ 1184 in_setsockaddr(inp, addr); 1185 break; 1186 1187 case PRU_PEERADDR: 1188 #ifdef INET6 1189 if (inp->inp_flags & INP_IPV6) 1190 in6_setpeeraddr(inp, addr); 1191 else 1192 #endif /* INET6 */ 1193 in_setpeeraddr(inp, addr); 1194 break; 1195 1196 case PRU_SENSE: 1197 /* 1198 * stat: don't bother with a blocksize. 1199 */ 1200 /* 1201 * Perhaps Path MTU might be returned for a connected 1202 * UDP socket in this case. 1203 */ 1204 break; 1205 1206 case PRU_SENDOOB: 1207 case PRU_FASTTIMO: 1208 case PRU_SLOWTIMO: 1209 case PRU_PROTORCV: 1210 case PRU_PROTOSEND: 1211 case PRU_RCVD: 1212 case PRU_RCVOOB: 1213 error = EOPNOTSUPP; 1214 break; 1215 1216 default: 1217 panic("udp_usrreq"); 1218 } 1219 release: 1220 if (req != PRU_RCVD && req != PRU_RCVOOB && req != PRU_SENSE) { 1221 m_freem(control); 1222 m_freem(m); 1223 } 1224 return (error); 1225 } 1226 1227 int 1228 udp_attach(struct socket *so, int proto) 1229 { 1230 int error; 1231 1232 if (so->so_pcb != NULL) 1233 return EINVAL; 1234 1235 if ((error = soreserve(so, udp_sendspace, udp_recvspace))) 1236 return error; 1237 1238 NET_ASSERT_LOCKED(); 1239 if ((error = in_pcballoc(so, &udbtable))) 1240 return error; 1241 #ifdef INET6 1242 if (sotoinpcb(so)->inp_flags & INP_IPV6) 1243 sotoinpcb(so)->inp_ipv6.ip6_hlim = ip6_defhlim; 1244 else 1245 #endif /* INET6 */ 1246 sotoinpcb(so)->inp_ip.ip_ttl = ip_defttl; 1247 return 0; 1248 } 1249 1250 int 1251 udp_detach(struct socket *so) 1252 { 1253 struct inpcb *inp; 1254 1255 soassertlocked(so); 1256 1257 inp = sotoinpcb(so); 1258 if (inp == NULL) 1259 return (EINVAL); 1260 1261 in_pcbdetach(inp); 1262 return (0); 1263 } 1264 1265 /* 1266 * Sysctl for udp variables. 1267 */ 1268 int 1269 udp_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 1270 size_t newlen) 1271 { 1272 int error; 1273 1274 /* All sysctl names at this level are terminal. */ 1275 if (namelen != 1) 1276 return (ENOTDIR); 1277 1278 switch (name[0]) { 1279 case UDPCTL_BADDYNAMIC: 1280 NET_LOCK(); 1281 error = sysctl_struct(oldp, oldlenp, newp, newlen, 1282 baddynamicports.udp, sizeof(baddynamicports.udp)); 1283 NET_UNLOCK(); 1284 return (error); 1285 1286 case UDPCTL_ROOTONLY: 1287 if (newp && securelevel > 0) 1288 return (EPERM); 1289 NET_LOCK(); 1290 error = sysctl_struct(oldp, oldlenp, newp, newlen, 1291 rootonlyports.udp, sizeof(rootonlyports.udp)); 1292 NET_UNLOCK(); 1293 return (error); 1294 1295 case UDPCTL_STATS: 1296 if (newp != NULL) 1297 return (EPERM); 1298 1299 return (udp_sysctl_udpstat(oldp, oldlenp, newp)); 1300 1301 default: 1302 NET_LOCK(); 1303 error = sysctl_bounded_arr(udpctl_vars, nitems(udpctl_vars), 1304 name, namelen, oldp, oldlenp, newp, newlen); 1305 NET_UNLOCK(); 1306 return (error); 1307 } 1308 /* NOTREACHED */ 1309 } 1310 1311 int 1312 udp_sysctl_udpstat(void *oldp, size_t *oldlenp, void *newp) 1313 { 1314 uint64_t counters[udps_ncounters]; 1315 struct udpstat udpstat; 1316 u_long *words = (u_long *)&udpstat; 1317 int i; 1318 1319 CTASSERT(sizeof(udpstat) == (nitems(counters) * sizeof(u_long))); 1320 memset(&udpstat, 0, sizeof udpstat); 1321 counters_read(udpcounters, counters, nitems(counters)); 1322 1323 for (i = 0; i < nitems(counters); i++) 1324 words[i] = (u_long)counters[i]; 1325 1326 return (sysctl_rdstruct(oldp, oldlenp, newp, 1327 &udpstat, sizeof(udpstat))); 1328 } 1329