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sys/netinet/udp_usrreq.c
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1 /* 2 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 34 * $FreeBSD: releng/5.2/sys/netinet/udp_usrreq.c 122991 2003-11-26 01:40:44Z sam $ 35 */ 36 37 #include "opt_ipsec.h" 38 #include "opt_inet6.h" 39 #include "opt_mac.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/domain.h> 44 #include <sys/jail.h> 45 #include <sys/kernel.h> 46 #include <sys/lock.h> 47 #include <sys/mac.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/proc.h> 51 #include <sys/protosw.h> 52 #include <sys/signalvar.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 #include <sys/sx.h> 56 #include <sys/sysctl.h> 57 #include <sys/syslog.h> 58 59 #include <vm/uma.h> 60 61 #include <net/if.h> 62 #include <net/route.h> 63 64 #include <netinet/in.h> 65 #include <netinet/in_systm.h> 66 #include <netinet/in_pcb.h> 67 #include <netinet/in_var.h> 68 #include <netinet/ip.h> 69 #ifdef INET6 70 #include <netinet/ip6.h> 71 #endif 72 #include <netinet/ip_icmp.h> 73 #include <netinet/icmp_var.h> 74 #include <netinet/ip_var.h> 75 #ifdef INET6 76 #include <netinet6/ip6_var.h> 77 #endif 78 #include <netinet/udp.h> 79 #include <netinet/udp_var.h> 80 81 #ifdef FAST_IPSEC 82 #include <netipsec/ipsec.h> 83 #endif /*FAST_IPSEC*/ 84 85 #ifdef IPSEC 86 #include <netinet6/ipsec.h> 87 #endif /*IPSEC*/ 88 89 #include <machine/in_cksum.h> 90 91 /* 92 * UDP protocol implementation. 93 * Per RFC 768, August, 1980. 94 */ 95 #ifndef COMPAT_42 96 static int udpcksum = 1; 97 #else 98 static int udpcksum = 0; /* XXX */ 99 #endif 100 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, 101 &udpcksum, 0, ""); 102 103 int log_in_vain = 0; 104 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 105 &log_in_vain, 0, "Log all incoming UDP packets"); 106 107 static int blackhole = 0; 108 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, 109 &blackhole, 0, "Do not send port unreachables for refused connects"); 110 111 static int strict_mcast_mship = 0; 112 SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW, 113 &strict_mcast_mship, 0, "Only send multicast to member sockets"); 114 115 struct inpcbhead udb; /* from udp_var.h */ 116 #define udb6 udb /* for KAME src sync over BSD*'s */ 117 struct inpcbinfo udbinfo; 118 119 #ifndef UDBHASHSIZE 120 #define UDBHASHSIZE 16 121 #endif 122 123 struct udpstat udpstat; /* from udp_var.h */ 124 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW, 125 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); 126 127 static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; 128 #ifdef INET6 129 struct udp_in6 { 130 struct sockaddr_in6 uin6_sin; 131 u_char uin6_init_done : 1; 132 } udp_in6 = { 133 { sizeof(udp_in6.uin6_sin), AF_INET6 }, 134 0 135 }; 136 struct udp_ip6 { 137 struct ip6_hdr uip6_ip6; 138 u_char uip6_init_done : 1; 139 } udp_ip6; 140 #endif /* INET6 */ 141 142 static void udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, 143 int off); 144 #ifdef INET6 145 static void ip_2_ip6_hdr(struct ip6_hdr *ip6, struct ip *ip); 146 #endif 147 148 static int udp_detach(struct socket *so); 149 static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *, 150 struct mbuf *, struct thread *); 151 152 void 153 udp_init() 154 { 155 INP_INFO_LOCK_INIT(&udbinfo, "udp"); 156 LIST_INIT(&udb); 157 udbinfo.listhead = &udb; 158 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask); 159 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB, 160 &udbinfo.porthashmask); 161 udbinfo.ipi_zone = uma_zcreate("udpcb", sizeof(struct inpcb), NULL, 162 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 163 uma_zone_set_max(udbinfo.ipi_zone, maxsockets); 164 } 165 166 void 167 udp_input(m, off) 168 register struct mbuf *m; 169 int off; 170 { 171 int iphlen = off; 172 register struct ip *ip; 173 register struct udphdr *uh; 174 register struct inpcb *inp; 175 struct mbuf *opts = 0; 176 int len; 177 struct ip save_ip; 178 179 udpstat.udps_ipackets++; 180 181 /* 182 * Strip IP options, if any; should skip this, 183 * make available to user, and use on returned packets, 184 * but we don't yet have a way to check the checksum 185 * with options still present. 186 */ 187 if (iphlen > sizeof (struct ip)) { 188 ip_stripoptions(m, (struct mbuf *)0); 189 iphlen = sizeof(struct ip); 190 } 191 192 /* 193 * Get IP and UDP header together in first mbuf. 194 */ 195 ip = mtod(m, struct ip *); 196 if (m->m_len < iphlen + sizeof(struct udphdr)) { 197 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { 198 udpstat.udps_hdrops++; 199 return; 200 } 201 ip = mtod(m, struct ip *); 202 } 203 uh = (struct udphdr *)((caddr_t)ip + iphlen); 204 205 /* destination port of 0 is illegal, based on RFC768. */ 206 if (uh->uh_dport == 0) 207 goto badunlocked; 208 209 /* 210 * Construct sockaddr format source address. 211 * Stuff source address and datagram in user buffer. 212 */ 213 udp_in.sin_port = uh->uh_sport; 214 udp_in.sin_addr = ip->ip_src; 215 #ifdef INET6 216 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0; 217 #endif 218 219 /* 220 * Make mbuf data length reflect UDP length. 221 * If not enough data to reflect UDP length, drop. 222 */ 223 len = ntohs((u_short)uh->uh_ulen); 224 if (ip->ip_len != len) { 225 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 226 udpstat.udps_badlen++; 227 goto badunlocked; 228 } 229 m_adj(m, len - ip->ip_len); 230 /* ip->ip_len = len; */ 231 } 232 /* 233 * Save a copy of the IP header in case we want restore it 234 * for sending an ICMP error message in response. 235 */ 236 if (!blackhole) 237 save_ip = *ip; 238 239 /* 240 * Checksum extended UDP header and data. 241 */ 242 if (uh->uh_sum) { 243 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 244 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 245 uh->uh_sum = m->m_pkthdr.csum_data; 246 else 247 uh->uh_sum = in_pseudo(ip->ip_src.s_addr, 248 ip->ip_dst.s_addr, htonl((u_short)len + 249 m->m_pkthdr.csum_data + IPPROTO_UDP)); 250 uh->uh_sum ^= 0xffff; 251 } else { 252 char b[9]; 253 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 254 bzero(((struct ipovly *)ip)->ih_x1, 9); 255 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 256 uh->uh_sum = in_cksum(m, len + sizeof (struct ip)); 257 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 258 } 259 if (uh->uh_sum) { 260 udpstat.udps_badsum++; 261 m_freem(m); 262 return; 263 } 264 } else 265 udpstat.udps_nosum++; 266 267 INP_INFO_RLOCK(&udbinfo); 268 269 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 270 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { 271 struct inpcb *last; 272 /* 273 * Deliver a multicast or broadcast datagram to *all* sockets 274 * for which the local and remote addresses and ports match 275 * those of the incoming datagram. This allows more than 276 * one process to receive multi/broadcasts on the same port. 277 * (This really ought to be done for unicast datagrams as 278 * well, but that would cause problems with existing 279 * applications that open both address-specific sockets and 280 * a wildcard socket listening to the same port -- they would 281 * end up receiving duplicates of every unicast datagram. 282 * Those applications open the multiple sockets to overcome an 283 * inadequacy of the UDP socket interface, but for backwards 284 * compatibility we avoid the problem here rather than 285 * fixing the interface. Maybe 4.5BSD will remedy this?) 286 */ 287 288 /* 289 * Locate pcb(s) for datagram. 290 * (Algorithm copied from raw_intr().) 291 */ 292 last = NULL; 293 LIST_FOREACH(inp, &udb, inp_list) { 294 INP_LOCK(inp); 295 if (inp->inp_lport != uh->uh_dport) { 296 docontinue: 297 INP_UNLOCK(inp); 298 continue; 299 } 300 #ifdef INET6 301 if ((inp->inp_vflag & INP_IPV4) == 0) 302 goto docontinue; 303 #endif 304 if (inp->inp_laddr.s_addr != INADDR_ANY) { 305 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 306 goto docontinue; 307 } 308 if (inp->inp_faddr.s_addr != INADDR_ANY) { 309 if (inp->inp_faddr.s_addr != 310 ip->ip_src.s_addr || 311 inp->inp_fport != uh->uh_sport) 312 goto docontinue; 313 } 314 315 /* 316 * Check multicast packets to make sure they are only 317 * sent to sockets with multicast memberships for the 318 * packet's destination address and arrival interface 319 */ 320 #define MSHIP(_inp, n) ((_inp)->inp_moptions->imo_membership[(n)]) 321 #define NMSHIPS(_inp) ((_inp)->inp_moptions->imo_num_memberships) 322 if (strict_mcast_mship && inp->inp_moptions != NULL) { 323 int mship, foundmship = 0; 324 325 for (mship = 0; mship < NMSHIPS(inp); mship++) { 326 if (MSHIP(inp, mship)->inm_addr.s_addr 327 == ip->ip_dst.s_addr && 328 MSHIP(inp, mship)->inm_ifp 329 == m->m_pkthdr.rcvif) { 330 foundmship = 1; 331 break; 332 } 333 } 334 if (foundmship == 0) 335 goto docontinue; 336 } 337 #undef NMSHIPS 338 #undef MSHIP 339 if (last != NULL) { 340 struct mbuf *n; 341 342 n = m_copy(m, 0, M_COPYALL); 343 if (n != NULL) 344 udp_append(last, ip, n, 345 iphlen + 346 sizeof(struct udphdr)); 347 INP_UNLOCK(last); 348 } 349 last = inp; 350 /* 351 * Don't look for additional matches if this one does 352 * not have either the SO_REUSEPORT or SO_REUSEADDR 353 * socket options set. This heuristic avoids searching 354 * through all pcbs in the common case of a non-shared 355 * port. It * assumes that an application will never 356 * clear these options after setting them. 357 */ 358 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0) 359 break; 360 } 361 362 if (last == NULL) { 363 /* 364 * No matching pcb found; discard datagram. 365 * (No need to send an ICMP Port Unreachable 366 * for a broadcast or multicast datgram.) 367 */ 368 udpstat.udps_noportbcast++; 369 goto badheadlocked; 370 } 371 INP_INFO_RUNLOCK(&udbinfo); 372 udp_append(last, ip, m, iphlen + sizeof(struct udphdr)); 373 INP_UNLOCK(last); 374 return; 375 } 376 /* 377 * Locate pcb for datagram. 378 */ 379 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, 380 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 381 if (inp == NULL) { 382 if (log_in_vain) { 383 char buf[4*sizeof "123"]; 384 385 strcpy(buf, inet_ntoa(ip->ip_dst)); 386 log(LOG_INFO, 387 "Connection attempt to UDP %s:%d from %s:%d\n", 388 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 389 ntohs(uh->uh_sport)); 390 } 391 udpstat.udps_noport++; 392 if (m->m_flags & (M_BCAST | M_MCAST)) { 393 udpstat.udps_noportbcast++; 394 goto badheadlocked; 395 } 396 if (blackhole) 397 goto badheadlocked; 398 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 399 goto badheadlocked; 400 *ip = save_ip; 401 ip->ip_len += iphlen; 402 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 403 INP_INFO_RUNLOCK(&udbinfo); 404 return; 405 } 406 INP_LOCK(inp); 407 INP_INFO_RUNLOCK(&udbinfo); 408 udp_append(inp, ip, m, iphlen + sizeof(struct udphdr)); 409 INP_UNLOCK(inp); 410 return; 411 412 badheadlocked: 413 INP_INFO_RUNLOCK(&udbinfo); 414 if (inp) 415 INP_UNLOCK(inp); 416 badunlocked: 417 m_freem(m); 418 if (opts) 419 m_freem(opts); 420 return; 421 } 422 423 #ifdef INET6 424 static void 425 ip_2_ip6_hdr(ip6, ip) 426 struct ip6_hdr *ip6; 427 struct ip *ip; 428 { 429 bzero(ip6, sizeof(*ip6)); 430 431 ip6->ip6_vfc = IPV6_VERSION; 432 ip6->ip6_plen = ip->ip_len; 433 ip6->ip6_nxt = ip->ip_p; 434 ip6->ip6_hlim = ip->ip_ttl; 435 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] = 436 IPV6_ADDR_INT32_SMP; 437 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr; 438 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr; 439 } 440 #endif 441 442 /* 443 * subroutine of udp_input(), mainly for source code readability. 444 * caller must properly init udp_ip6 and udp_in6 beforehand. 445 */ 446 static void 447 udp_append(last, ip, n, off) 448 struct inpcb *last; 449 struct ip *ip; 450 struct mbuf *n; 451 int off; 452 { 453 struct sockaddr *append_sa; 454 struct mbuf *opts = 0; 455 456 #ifdef IPSEC 457 /* check AH/ESP integrity. */ 458 if (ipsec4_in_reject_so(n, last->inp_socket)) { 459 ipsecstat.in_polvio++; 460 m_freem(n); 461 return; 462 } 463 #endif /*IPSEC*/ 464 #ifdef FAST_IPSEC 465 /* check AH/ESP integrity. */ 466 if (ipsec4_in_reject(n, last)) { 467 m_freem(n); 468 return; 469 } 470 #endif /*FAST_IPSEC*/ 471 #ifdef MAC 472 if (mac_check_inpcb_deliver(last, n) != 0) { 473 m_freem(n); 474 return; 475 } 476 #endif 477 if (last->inp_flags & INP_CONTROLOPTS || 478 last->inp_socket->so_options & SO_TIMESTAMP) { 479 #ifdef INET6 480 if (last->inp_vflag & INP_IPV6) { 481 int savedflags; 482 483 if (udp_ip6.uip6_init_done == 0) { 484 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 485 udp_ip6.uip6_init_done = 1; 486 } 487 savedflags = last->inp_flags; 488 last->inp_flags &= ~INP_UNMAPPABLEOPTS; 489 ip6_savecontrol(last, n, &opts); 490 last->inp_flags = savedflags; 491 } else 492 #endif 493 ip_savecontrol(last, &opts, ip, n); 494 } 495 #ifdef INET6 496 if (last->inp_vflag & INP_IPV6) { 497 if (udp_in6.uin6_init_done == 0) { 498 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 499 udp_in6.uin6_init_done = 1; 500 } 501 append_sa = (struct sockaddr *)&udp_in6.uin6_sin; 502 } else 503 #endif 504 append_sa = (struct sockaddr *)&udp_in; 505 m_adj(n, off); 506 if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) { 507 m_freem(n); 508 if (opts) 509 m_freem(opts); 510 udpstat.udps_fullsock++; 511 } else 512 sorwakeup(last->inp_socket); 513 } 514 515 /* 516 * Notify a udp user of an asynchronous error; 517 * just wake up so that he can collect error status. 518 */ 519 struct inpcb * 520 udp_notify(inp, errno) 521 register struct inpcb *inp; 522 int errno; 523 { 524 inp->inp_socket->so_error = errno; 525 sorwakeup(inp->inp_socket); 526 sowwakeup(inp->inp_socket); 527 return inp; 528 } 529 530 void 531 udp_ctlinput(cmd, sa, vip) 532 int cmd; 533 struct sockaddr *sa; 534 void *vip; 535 { 536 struct ip *ip = vip; 537 struct udphdr *uh; 538 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 539 struct in_addr faddr; 540 struct inpcb *inp; 541 int s; 542 543 faddr = ((struct sockaddr_in *)sa)->sin_addr; 544 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 545 return; 546 547 /* 548 * Redirects don't need to be handled up here. 549 */ 550 if (PRC_IS_REDIRECT(cmd)) 551 return; 552 /* 553 * Hostdead is ugly because it goes linearly through all PCBs. 554 * XXX: We never get this from ICMP, otherwise it makes an 555 * excellent DoS attack on machines with many connections. 556 */ 557 if (cmd == PRC_HOSTDEAD) 558 ip = 0; 559 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 560 return; 561 if (ip) { 562 s = splnet(); 563 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 564 INP_INFO_RLOCK(&udbinfo); 565 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport, 566 ip->ip_src, uh->uh_sport, 0, NULL); 567 if (inp != NULL) { 568 INP_LOCK(inp); 569 if (inp->inp_socket != NULL) { 570 (*notify)(inp, inetctlerrmap[cmd]); 571 } 572 INP_UNLOCK(inp); 573 } 574 INP_INFO_RUNLOCK(&udbinfo); 575 splx(s); 576 } else 577 in_pcbnotifyall(&udbinfo, faddr, inetctlerrmap[cmd], notify); 578 } 579 580 static int 581 udp_pcblist(SYSCTL_HANDLER_ARGS) 582 { 583 int error, i, n, s; 584 struct inpcb *inp, **inp_list; 585 inp_gen_t gencnt; 586 struct xinpgen xig; 587 588 /* 589 * The process of preparing the TCB list is too time-consuming and 590 * resource-intensive to repeat twice on every request. 591 */ 592 if (req->oldptr == 0) { 593 n = udbinfo.ipi_count; 594 req->oldidx = 2 * (sizeof xig) 595 + (n + n/8) * sizeof(struct xinpcb); 596 return 0; 597 } 598 599 if (req->newptr != 0) 600 return EPERM; 601 602 /* 603 * OK, now we're committed to doing something. 604 */ 605 s = splnet(); 606 INP_INFO_RLOCK(&udbinfo); 607 gencnt = udbinfo.ipi_gencnt; 608 n = udbinfo.ipi_count; 609 INP_INFO_RUNLOCK(&udbinfo); 610 splx(s); 611 612 sysctl_wire_old_buffer(req, 2 * (sizeof xig) 613 + n * sizeof(struct xinpcb)); 614 615 xig.xig_len = sizeof xig; 616 xig.xig_count = n; 617 xig.xig_gen = gencnt; 618 xig.xig_sogen = so_gencnt; 619 error = SYSCTL_OUT(req, &xig, sizeof xig); 620 if (error) 621 return error; 622 623 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 624 if (inp_list == 0) 625 return ENOMEM; 626 627 s = splnet(); 628 INP_INFO_RLOCK(&udbinfo); 629 for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n; 630 inp = LIST_NEXT(inp, inp_list)) { 631 INP_LOCK(inp); 632 if (inp->inp_gencnt <= gencnt && 633 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) 634 inp_list[i++] = inp; 635 INP_UNLOCK(inp); 636 } 637 INP_INFO_RUNLOCK(&udbinfo); 638 splx(s); 639 n = i; 640 641 error = 0; 642 for (i = 0; i < n; i++) { 643 inp = inp_list[i]; 644 if (inp->inp_gencnt <= gencnt) { 645 struct xinpcb xi; 646 xi.xi_len = sizeof xi; 647 /* XXX should avoid extra copy */ 648 bcopy(inp, &xi.xi_inp, sizeof *inp); 649 if (inp->inp_socket) 650 sotoxsocket(inp->inp_socket, &xi.xi_socket); 651 xi.xi_inp.inp_gencnt = inp->inp_gencnt; 652 error = SYSCTL_OUT(req, &xi, sizeof xi); 653 } 654 } 655 if (!error) { 656 /* 657 * Give the user an updated idea of our state. 658 * If the generation differs from what we told 659 * her before, she knows that something happened 660 * while we were processing this request, and it 661 * might be necessary to retry. 662 */ 663 s = splnet(); 664 INP_INFO_RLOCK(&udbinfo); 665 xig.xig_gen = udbinfo.ipi_gencnt; 666 xig.xig_sogen = so_gencnt; 667 xig.xig_count = udbinfo.ipi_count; 668 INP_INFO_RUNLOCK(&udbinfo); 669 splx(s); 670 error = SYSCTL_OUT(req, &xig, sizeof xig); 671 } 672 free(inp_list, M_TEMP); 673 return error; 674 } 675 676 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 677 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 678 679 static int 680 udp_getcred(SYSCTL_HANDLER_ARGS) 681 { 682 struct xucred xuc; 683 struct sockaddr_in addrs[2]; 684 struct inpcb *inp; 685 int error, s; 686 687 error = suser_cred(req->td->td_ucred, PRISON_ROOT); 688 if (error) 689 return (error); 690 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 691 if (error) 692 return (error); 693 s = splnet(); 694 INP_INFO_RLOCK(&udbinfo); 695 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 696 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 697 if (inp == NULL || inp->inp_socket == NULL) { 698 error = ENOENT; 699 goto out; 700 } 701 error = cr_canseesocket(req->td->td_ucred, inp->inp_socket); 702 if (error) 703 goto out; 704 cru2x(inp->inp_socket->so_cred, &xuc); 705 out: 706 INP_INFO_RUNLOCK(&udbinfo); 707 splx(s); 708 if (error == 0) 709 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 710 return (error); 711 } 712 713 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, 714 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, 715 udp_getcred, "S,xucred", "Get the xucred of a UDP connection"); 716 717 static int 718 udp_output(inp, m, addr, control, td) 719 register struct inpcb *inp; 720 struct mbuf *m; 721 struct sockaddr *addr; 722 struct mbuf *control; 723 struct thread *td; 724 { 725 register struct udpiphdr *ui; 726 register int len = m->m_pkthdr.len; 727 struct in_addr faddr, laddr; 728 struct cmsghdr *cm; 729 struct sockaddr_in *sin, src; 730 int error = 0; 731 int ipflags; 732 u_short fport, lport; 733 734 INP_LOCK_ASSERT(inp); 735 #ifdef MAC 736 mac_create_mbuf_from_socket(inp->inp_socket, m); 737 #endif 738 739 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 740 error = EMSGSIZE; 741 if (control) 742 m_freem(control); 743 goto release; 744 } 745 746 src.sin_addr.s_addr = INADDR_ANY; 747 if (control != NULL) { 748 /* 749 * XXX: Currently, we assume all the optional information 750 * is stored in a single mbuf. 751 */ 752 if (control->m_next) { 753 error = EINVAL; 754 m_freem(control); 755 goto release; 756 } 757 for (; control->m_len > 0; 758 control->m_data += CMSG_ALIGN(cm->cmsg_len), 759 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 760 cm = mtod(control, struct cmsghdr *); 761 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0 || 762 cm->cmsg_len > control->m_len) { 763 error = EINVAL; 764 break; 765 } 766 if (cm->cmsg_level != IPPROTO_IP) 767 continue; 768 769 switch (cm->cmsg_type) { 770 case IP_SENDSRCADDR: 771 if (cm->cmsg_len != 772 CMSG_LEN(sizeof(struct in_addr))) { 773 error = EINVAL; 774 break; 775 } 776 bzero(&src, sizeof(src)); 777 src.sin_family = AF_INET; 778 src.sin_len = sizeof(src); 779 src.sin_port = inp->inp_lport; 780 src.sin_addr = *(struct in_addr *)CMSG_DATA(cm); 781 break; 782 default: 783 error = ENOPROTOOPT; 784 break; 785 } 786 if (error) 787 break; 788 } 789 m_freem(control); 790 } 791 if (error) 792 goto release; 793 laddr = inp->inp_laddr; 794 lport = inp->inp_lport; 795 if (src.sin_addr.s_addr != INADDR_ANY) { 796 if (lport == 0) { 797 error = EINVAL; 798 goto release; 799 } 800 error = in_pcbbind_setup(inp, (struct sockaddr *)&src, 801 &laddr.s_addr, &lport, td); 802 if (error) 803 goto release; 804 } 805 806 if (addr) { 807 sin = (struct sockaddr_in *)addr; 808 if (td && jailed(td->td_ucred)) 809 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr); 810 if (inp->inp_faddr.s_addr != INADDR_ANY) { 811 error = EISCONN; 812 goto release; 813 } 814 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, &lport, 815 &faddr.s_addr, &fport, NULL, td); 816 if (error) 817 goto release; 818 819 /* Commit the local port if newly assigned. */ 820 if (inp->inp_laddr.s_addr == INADDR_ANY && 821 inp->inp_lport == 0) { 822 inp->inp_lport = lport; 823 if (in_pcbinshash(inp) != 0) { 824 inp->inp_lport = 0; 825 error = EAGAIN; 826 goto release; 827 } 828 inp->inp_flags |= INP_ANONPORT; 829 } 830 } else { 831 faddr = inp->inp_faddr; 832 fport = inp->inp_fport; 833 if (faddr.s_addr == INADDR_ANY) { 834 error = ENOTCONN; 835 goto release; 836 } 837 } 838 /* 839 * Calculate data length and get a mbuf 840 * for UDP and IP headers. 841 */ 842 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 843 if (m == 0) { 844 error = ENOBUFS; 845 goto release; 846 } 847 848 /* 849 * Fill in mbuf with extended UDP header 850 * and addresses and length put into network format. 851 */ 852 ui = mtod(m, struct udpiphdr *); 853 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ 854 ui->ui_pr = IPPROTO_UDP; 855 ui->ui_src = laddr; 856 ui->ui_dst = faddr; 857 ui->ui_sport = lport; 858 ui->ui_dport = fport; 859 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 860 861 ipflags = inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST); 862 if (inp->inp_flags & INP_ONESBCAST) 863 ipflags |= IP_SENDONES; 864 865 /* 866 * Set up checksum and output datagram. 867 */ 868 if (udpcksum) { 869 if (inp->inp_flags & INP_ONESBCAST) 870 faddr.s_addr = INADDR_BROADCAST; 871 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr, 872 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 873 m->m_pkthdr.csum_flags = CSUM_UDP; 874 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 875 } else { 876 ui->ui_sum = 0; 877 } 878 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 879 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 880 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 881 udpstat.udps_opackets++; 882 883 error = ip_output(m, inp->inp_options, NULL, ipflags, 884 inp->inp_moptions, inp); 885 return (error); 886 887 release: 888 m_freem(m); 889 return (error); 890 } 891 892 u_long udp_sendspace = 9216; /* really max datagram size */ 893 /* 40 1K datagrams */ 894 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 895 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 896 897 u_long udp_recvspace = 40 * (1024 + 898 #ifdef INET6 899 sizeof(struct sockaddr_in6) 900 #else 901 sizeof(struct sockaddr_in) 902 #endif 903 ); 904 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 905 &udp_recvspace, 0, "Maximum incoming UDP datagram size"); 906 907 static int 908 udp_abort(struct socket *so) 909 { 910 struct inpcb *inp; 911 int s; 912 913 INP_INFO_WLOCK(&udbinfo); 914 inp = sotoinpcb(so); 915 if (inp == 0) { 916 INP_INFO_WUNLOCK(&udbinfo); 917 return EINVAL; /* ??? possible? panic instead? */ 918 } 919 INP_LOCK(inp); 920 soisdisconnected(so); 921 s = splnet(); 922 in_pcbdetach(inp); 923 INP_INFO_WUNLOCK(&udbinfo); 924 splx(s); 925 return 0; 926 } 927 928 static int 929 udp_attach(struct socket *so, int proto, struct thread *td) 930 { 931 struct inpcb *inp; 932 int s, error; 933 934 INP_INFO_WLOCK(&udbinfo); 935 inp = sotoinpcb(so); 936 if (inp != 0) { 937 INP_INFO_WUNLOCK(&udbinfo); 938 return EINVAL; 939 } 940 error = soreserve(so, udp_sendspace, udp_recvspace); 941 if (error) { 942 INP_INFO_WUNLOCK(&udbinfo); 943 return error; 944 } 945 s = splnet(); 946 error = in_pcballoc(so, &udbinfo, td, "udpinp"); 947 splx(s); 948 if (error) { 949 INP_INFO_WUNLOCK(&udbinfo); 950 return error; 951 } 952 953 inp = (struct inpcb *)so->so_pcb; 954 INP_LOCK(inp); 955 INP_INFO_WUNLOCK(&udbinfo); 956 inp->inp_vflag |= INP_IPV4; 957 inp->inp_ip_ttl = ip_defttl; 958 INP_UNLOCK(inp); 959 return 0; 960 } 961 962 static int 963 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 964 { 965 struct inpcb *inp; 966 int s, error; 967 968 INP_INFO_WLOCK(&udbinfo); 969 inp = sotoinpcb(so); 970 if (inp == 0) { 971 INP_INFO_WUNLOCK(&udbinfo); 972 return EINVAL; 973 } 974 INP_LOCK(inp); 975 s = splnet(); 976 error = in_pcbbind(inp, nam, td); 977 splx(s); 978 INP_UNLOCK(inp); 979 INP_INFO_WUNLOCK(&udbinfo); 980 return error; 981 } 982 983 static int 984 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 985 { 986 struct inpcb *inp; 987 int s, error; 988 struct sockaddr_in *sin; 989 990 INP_INFO_WLOCK(&udbinfo); 991 inp = sotoinpcb(so); 992 if (inp == 0) { 993 INP_INFO_WUNLOCK(&udbinfo); 994 return EINVAL; 995 } 996 INP_LOCK(inp); 997 if (inp->inp_faddr.s_addr != INADDR_ANY) { 998 INP_UNLOCK(inp); 999 INP_INFO_WUNLOCK(&udbinfo); 1000 return EISCONN; 1001 } 1002 s = splnet(); 1003 sin = (struct sockaddr_in *)nam; 1004 if (td && jailed(td->td_ucred)) 1005 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr); 1006 error = in_pcbconnect(inp, nam, td); 1007 splx(s); 1008 if (error == 0) 1009 soisconnected(so); 1010 INP_UNLOCK(inp); 1011 INP_INFO_WUNLOCK(&udbinfo); 1012 return error; 1013 } 1014 1015 static int 1016 udp_detach(struct socket *so) 1017 { 1018 struct inpcb *inp; 1019 int s; 1020 1021 INP_INFO_WLOCK(&udbinfo); 1022 inp = sotoinpcb(so); 1023 if (inp == 0) { 1024 INP_INFO_WUNLOCK(&udbinfo); 1025 return EINVAL; 1026 } 1027 INP_LOCK(inp); 1028 s = splnet(); 1029 in_pcbdetach(inp); 1030 INP_INFO_WUNLOCK(&udbinfo); 1031 splx(s); 1032 return 0; 1033 } 1034 1035 static int 1036 udp_disconnect(struct socket *so) 1037 { 1038 struct inpcb *inp; 1039 int s; 1040 1041 INP_INFO_WLOCK(&udbinfo); 1042 inp = sotoinpcb(so); 1043 if (inp == 0) { 1044 INP_INFO_WUNLOCK(&udbinfo); 1045 return EINVAL; 1046 } 1047 INP_LOCK(inp); 1048 if (inp->inp_faddr.s_addr == INADDR_ANY) { 1049 INP_INFO_WUNLOCK(&udbinfo); 1050 INP_UNLOCK(inp); 1051 return ENOTCONN; 1052 } 1053 1054 s = splnet(); 1055 in_pcbdisconnect(inp); 1056 inp->inp_laddr.s_addr = INADDR_ANY; 1057 INP_UNLOCK(inp); 1058 INP_INFO_WUNLOCK(&udbinfo); 1059 splx(s); 1060 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1061 return 0; 1062 } 1063 1064 static int 1065 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 1066 struct mbuf *control, struct thread *td) 1067 { 1068 struct inpcb *inp; 1069 int ret; 1070 1071 INP_INFO_WLOCK(&udbinfo); 1072 inp = sotoinpcb(so); 1073 if (inp == 0) { 1074 INP_INFO_WUNLOCK(&udbinfo); 1075 m_freem(m); 1076 return EINVAL; 1077 } 1078 INP_LOCK(inp); 1079 ret = udp_output(inp, m, addr, control, td); 1080 INP_UNLOCK(inp); 1081 INP_INFO_WUNLOCK(&udbinfo); 1082 return ret; 1083 } 1084 1085 int 1086 udp_shutdown(struct socket *so) 1087 { 1088 struct inpcb *inp; 1089 1090 INP_INFO_RLOCK(&udbinfo); 1091 inp = sotoinpcb(so); 1092 if (inp == 0) { 1093 INP_INFO_RUNLOCK(&udbinfo); 1094 return EINVAL; 1095 } 1096 INP_LOCK(inp); 1097 INP_INFO_RUNLOCK(&udbinfo); 1098 socantsendmore(so); 1099 INP_UNLOCK(inp); 1100 return 0; 1101 } 1102 1103 /* 1104 * This is the wrapper function for in_setsockaddr. We just pass down 1105 * the pcbinfo for in_setsockaddr to lock. We don't want to do the locking 1106 * here because in_setsockaddr will call malloc and might block. 1107 */ 1108 static int 1109 udp_sockaddr(struct socket *so, struct sockaddr **nam) 1110 { 1111 return (in_setsockaddr(so, nam, &udbinfo)); 1112 } 1113 1114 /* 1115 * This is the wrapper function for in_setpeeraddr. We just pass down 1116 * the pcbinfo for in_setpeeraddr to lock. 1117 */ 1118 static int 1119 udp_peeraddr(struct socket *so, struct sockaddr **nam) 1120 { 1121 return (in_setpeeraddr(so, nam, &udbinfo)); 1122 } 1123 1124 struct pr_usrreqs udp_usrreqs = { 1125 udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect, 1126 pru_connect2_notsupp, in_control, udp_detach, udp_disconnect, 1127 pru_listen_notsupp, udp_peeraddr, pru_rcvd_notsupp, 1128 pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown, 1129 udp_sockaddr, sosend, soreceive, sopoll, in_pcbsosetlabel 1130 };
Cache object: c00eefc88c4edc8aa94c5215e28243ea
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