Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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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 * $FreeBSD$ 35 */ 36 37 #include "opt_ipsec.h" 38 #include "opt_inet6.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/domain.h> 46 #include <sys/proc.h> 47 #include <sys/protosw.h> 48 #include <sys/socket.h> 49 #include <sys/socketvar.h> 50 #include <sys/sysctl.h> 51 #include <sys/syslog.h> 52 53 #include <vm/vm_zone.h> 54 55 #include <net/if.h> 56 #include <net/route.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_systm.h> 60 #include <netinet/ip.h> 61 #ifdef INET6 62 #include <netinet/ip6.h> 63 #endif 64 #include <netinet/in_pcb.h> 65 #include <netinet/in_var.h> 66 #include <netinet/ip_var.h> 67 #ifdef INET6 68 #include <netinet6/ip6_var.h> 69 #endif 70 #include <netinet/ip_icmp.h> 71 #include <netinet/icmp_var.h> 72 #include <netinet/udp.h> 73 #include <netinet/udp_var.h> 74 75 #ifdef FAST_IPSEC 76 #include <netipsec/ipsec.h> 77 #endif /*FAST_IPSEC*/ 78 79 #ifdef IPSEC 80 #include <netinet6/ipsec.h> 81 #endif /*IPSEC*/ 82 83 #include <machine/in_cksum.h> 84 85 /* 86 * UDP protocol implementation. 87 * Per RFC 768, August, 1980. 88 */ 89 #ifndef COMPAT_42 90 static int udpcksum = 1; 91 #else 92 static int udpcksum = 0; /* XXX */ 93 #endif 94 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, 95 &udpcksum, 0, ""); 96 97 int log_in_vain = 0; 98 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 99 &log_in_vain, 0, "Log all incoming UDP packets"); 100 101 static int blackhole = 0; 102 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, 103 &blackhole, 0, "Do not send port unreachables for refused connects"); 104 105 struct inpcbhead udb; /* from udp_var.h */ 106 #define udb6 udb /* for KAME src sync over BSD*'s */ 107 struct inpcbinfo udbinfo; 108 109 #ifndef UDBHASHSIZE 110 #define UDBHASHSIZE 16 111 #endif 112 113 struct udpstat udpstat; /* from udp_var.h */ 114 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW, 115 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); 116 117 static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; 118 #ifdef INET6 119 struct udp_in6 { 120 struct sockaddr_in6 uin6_sin; 121 u_char uin6_init_done : 1; 122 } udp_in6 = { 123 { sizeof(udp_in6.uin6_sin), AF_INET6 }, 124 0 125 }; 126 struct udp_ip6 { 127 struct ip6_hdr uip6_ip6; 128 u_char uip6_init_done : 1; 129 } udp_ip6; 130 #endif /* INET6 */ 131 132 static void udp_append __P((struct inpcb *last, struct ip *ip, 133 struct mbuf *n, int off)); 134 #ifdef INET6 135 static void ip_2_ip6_hdr __P((struct ip6_hdr *ip6, struct ip *ip)); 136 #endif 137 138 static int udp_detach __P((struct socket *so)); 139 static int udp_output __P((struct inpcb *, struct mbuf *, struct sockaddr *, 140 struct mbuf *, struct proc *)); 141 142 void 143 udp_init() 144 { 145 LIST_INIT(&udb); 146 udbinfo.listhead = &udb; 147 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask); 148 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB, 149 &udbinfo.porthashmask); 150 udbinfo.ipi_zone = zinit("udpcb", sizeof(struct inpcb), maxsockets, 151 ZONE_INTERRUPT, 0); 152 } 153 154 void 155 udp_input(m, off, proto) 156 register struct mbuf *m; 157 int off, proto; 158 { 159 int iphlen = off; 160 register struct ip *ip; 161 register struct udphdr *uh; 162 register struct inpcb *inp; 163 struct mbuf *opts = 0; 164 int len; 165 struct ip save_ip; 166 struct sockaddr *append_sa; 167 168 udpstat.udps_ipackets++; 169 170 /* 171 * Strip IP options, if any; should skip this, 172 * make available to user, and use on returned packets, 173 * but we don't yet have a way to check the checksum 174 * with options still present. 175 */ 176 if (iphlen > sizeof (struct ip)) { 177 ip_stripoptions(m, (struct mbuf *)0); 178 iphlen = sizeof(struct ip); 179 } 180 181 /* 182 * Get IP and UDP header together in first mbuf. 183 */ 184 ip = mtod(m, struct ip *); 185 if (m->m_len < iphlen + sizeof(struct udphdr)) { 186 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { 187 udpstat.udps_hdrops++; 188 return; 189 } 190 ip = mtod(m, struct ip *); 191 } 192 uh = (struct udphdr *)((caddr_t)ip + iphlen); 193 194 /* destination port of 0 is illegal, based on RFC768. */ 195 if (uh->uh_dport == 0) 196 goto bad; 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_short)uh->uh_ulen); 203 if (ip->ip_len != len) { 204 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 205 udpstat.udps_badlen++; 206 goto bad; 207 } 208 m_adj(m, len - ip->ip_len); 209 /* ip->ip_len = len; */ 210 } 211 /* 212 * Save a copy of the IP header in case we want restore it 213 * for sending an ICMP error message in response. 214 */ 215 save_ip = *ip; 216 217 /* 218 * Checksum extended UDP header and data. 219 */ 220 if (uh->uh_sum) { 221 u_short uh_sum; 222 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 223 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 224 uh_sum = m->m_pkthdr.csum_data; 225 else 226 uh_sum = in_pseudo(ip->ip_src.s_addr, 227 ip->ip_dst.s_addr, htonl((u_short)len + 228 m->m_pkthdr.csum_data + IPPROTO_UDP)); 229 uh_sum ^= 0xffff; 230 } else { 231 char b[9]; 232 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 233 bzero(((struct ipovly *)ip)->ih_x1, 9); 234 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 235 uh_sum = in_cksum(m, len + sizeof (struct ip)); 236 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 237 } 238 if (uh_sum) { 239 udpstat.udps_badsum++; 240 m_freem(m); 241 return; 242 } 243 } else 244 udpstat.udps_nosum++; 245 246 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 247 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { 248 struct inpcb *last; 249 /* 250 * Deliver a multicast or broadcast datagram to *all* sockets 251 * for which the local and remote addresses and ports match 252 * those of the incoming datagram. This allows more than 253 * one process to receive multi/broadcasts on the same port. 254 * (This really ought to be done for unicast datagrams as 255 * well, but that would cause problems with existing 256 * applications that open both address-specific sockets and 257 * a wildcard socket listening to the same port -- they would 258 * end up receiving duplicates of every unicast datagram. 259 * Those applications open the multiple sockets to overcome an 260 * inadequacy of the UDP socket interface, but for backwards 261 * compatibility we avoid the problem here rather than 262 * fixing the interface. Maybe 4.5BSD will remedy this?) 263 */ 264 265 /* 266 * Construct sockaddr format source address. 267 */ 268 udp_in.sin_port = uh->uh_sport; 269 udp_in.sin_addr = ip->ip_src; 270 /* 271 * Locate pcb(s) for datagram. 272 * (Algorithm copied from raw_intr().) 273 */ 274 last = NULL; 275 #ifdef INET6 276 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0; 277 #endif 278 LIST_FOREACH(inp, &udb, inp_list) { 279 #ifdef INET6 280 if ((inp->inp_vflag & INP_IPV4) == 0) 281 continue; 282 #endif 283 if (inp->inp_lport != uh->uh_dport) 284 continue; 285 if (inp->inp_laddr.s_addr != INADDR_ANY) { 286 if (inp->inp_laddr.s_addr != 287 ip->ip_dst.s_addr) 288 continue; 289 } 290 if (inp->inp_faddr.s_addr != INADDR_ANY) { 291 if (inp->inp_faddr.s_addr != 292 ip->ip_src.s_addr || 293 inp->inp_fport != uh->uh_sport) 294 continue; 295 } 296 297 if (last != NULL) { 298 struct mbuf *n; 299 300 #ifdef IPSEC 301 /* check AH/ESP integrity. */ 302 if (ipsec4_in_reject_so(m, last->inp_socket)) 303 ipsecstat.in_polvio++; 304 /* do not inject data to pcb */ 305 else 306 #endif /*IPSEC*/ 307 #ifdef FAST_IPSEC 308 /* check AH/ESP integrity. */ 309 if (ipsec4_in_reject(m, last)) 310 ; 311 else 312 #endif /*FAST_IPSEC*/ 313 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 314 udp_append(last, ip, n, 315 iphlen + 316 sizeof(struct udphdr)); 317 } 318 last = inp; 319 /* 320 * Don't look for additional matches if this one does 321 * not have either the SO_REUSEPORT or SO_REUSEADDR 322 * socket options set. This heuristic avoids searching 323 * through all pcbs in the common case of a non-shared 324 * port. It * assumes that an application will never 325 * clear these options after setting them. 326 */ 327 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0) 328 break; 329 } 330 331 if (last == NULL) { 332 /* 333 * No matching pcb found; discard datagram. 334 * (No need to send an ICMP Port Unreachable 335 * for a broadcast or multicast datgram.) 336 */ 337 udpstat.udps_noportbcast++; 338 goto bad; 339 } 340 #ifdef IPSEC 341 /* check AH/ESP integrity. */ 342 if (ipsec4_in_reject_so(m, last->inp_socket)) { 343 ipsecstat.in_polvio++; 344 goto bad; 345 } 346 #endif /*IPSEC*/ 347 #ifdef FAST_IPSEC 348 /* check AH/ESP integrity. */ 349 if (ipsec4_in_reject(m, last)) 350 goto bad; 351 #endif /*FAST_IPSEC*/ 352 udp_append(last, ip, m, iphlen + sizeof(struct udphdr)); 353 return; 354 } 355 /* 356 * Locate pcb for datagram. 357 */ 358 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, 359 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 360 if (inp == NULL) { 361 if (log_in_vain) { 362 char buf[4*sizeof "123"]; 363 364 strcpy(buf, inet_ntoa(ip->ip_dst)); 365 log(LOG_INFO, 366 "Connection attempt to UDP %s:%d from %s:%d\n", 367 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 368 ntohs(uh->uh_sport)); 369 } 370 udpstat.udps_noport++; 371 if (m->m_flags & (M_BCAST | M_MCAST)) { 372 udpstat.udps_noportbcast++; 373 goto bad; 374 } 375 if (blackhole) 376 goto bad; 377 #ifdef ICMP_BANDLIM 378 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 379 goto bad; 380 #endif 381 *ip = save_ip; 382 ip->ip_len += iphlen; 383 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 384 return; 385 } 386 #ifdef IPSEC 387 if (ipsec4_in_reject_so(m, inp->inp_socket)) { 388 ipsecstat.in_polvio++; 389 goto bad; 390 } 391 #endif /*IPSEC*/ 392 #ifdef FAST_IPSEC 393 if (ipsec4_in_reject(m, inp)) 394 goto bad; 395 #endif /*FAST_IPSEC*/ 396 397 /* 398 * Construct sockaddr format source address. 399 * Stuff source address and datagram in user buffer. 400 */ 401 udp_in.sin_port = uh->uh_sport; 402 udp_in.sin_addr = ip->ip_src; 403 if (inp->inp_flags & INP_CONTROLOPTS 404 || inp->inp_socket->so_options & SO_TIMESTAMP) { 405 #ifdef INET6 406 if (inp->inp_vflag & INP_IPV6) { 407 int savedflags; 408 409 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 410 savedflags = inp->inp_flags; 411 inp->inp_flags &= ~INP_UNMAPPABLEOPTS; 412 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m); 413 inp->inp_flags = savedflags; 414 } else 415 #endif 416 ip_savecontrol(inp, &opts, ip, m); 417 } 418 m_adj(m, iphlen + sizeof(struct udphdr)); 419 #ifdef INET6 420 if (inp->inp_vflag & INP_IPV6) { 421 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 422 append_sa = (struct sockaddr *)&udp_in6; 423 } else 424 #endif 425 append_sa = (struct sockaddr *)&udp_in; 426 if (sbappendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) { 427 udpstat.udps_fullsock++; 428 goto bad; 429 } 430 sorwakeup(inp->inp_socket); 431 return; 432 bad: 433 m_freem(m); 434 if (opts) 435 m_freem(opts); 436 return; 437 } 438 439 #ifdef INET6 440 static void 441 ip_2_ip6_hdr(ip6, ip) 442 struct ip6_hdr *ip6; 443 struct ip *ip; 444 { 445 bzero(ip6, sizeof(*ip6)); 446 447 ip6->ip6_vfc = IPV6_VERSION; 448 ip6->ip6_plen = ip->ip_len; 449 ip6->ip6_nxt = ip->ip_p; 450 ip6->ip6_hlim = ip->ip_ttl; 451 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] = 452 IPV6_ADDR_INT32_SMP; 453 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr; 454 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr; 455 } 456 #endif 457 458 /* 459 * subroutine of udp_input(), mainly for source code readability. 460 * caller must properly init udp_ip6 and udp_in6 beforehand. 461 */ 462 static void 463 udp_append(last, ip, n, off) 464 struct inpcb *last; 465 struct ip *ip; 466 struct mbuf *n; 467 int off; 468 { 469 struct sockaddr *append_sa; 470 struct mbuf *opts = 0; 471 472 if (last->inp_flags & INP_CONTROLOPTS || 473 last->inp_socket->so_options & SO_TIMESTAMP) { 474 #ifdef INET6 475 if (last->inp_vflag & INP_IPV6) { 476 int savedflags; 477 478 if (udp_ip6.uip6_init_done == 0) { 479 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 480 udp_ip6.uip6_init_done = 1; 481 } 482 savedflags = last->inp_flags; 483 last->inp_flags &= ~INP_UNMAPPABLEOPTS; 484 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n); 485 last->inp_flags = savedflags; 486 } else 487 #endif 488 ip_savecontrol(last, &opts, ip, n); 489 } 490 #ifdef INET6 491 if (last->inp_vflag & INP_IPV6) { 492 if (udp_in6.uin6_init_done == 0) { 493 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 494 udp_in6.uin6_init_done = 1; 495 } 496 append_sa = (struct sockaddr *)&udp_in6.uin6_sin; 497 } else 498 #endif 499 append_sa = (struct sockaddr *)&udp_in; 500 m_adj(n, off); 501 if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) { 502 m_freem(n); 503 if (opts) 504 m_freem(opts); 505 udpstat.udps_fullsock++; 506 } else 507 sorwakeup(last->inp_socket); 508 } 509 510 /* 511 * Notify a udp user of an asynchronous error; 512 * just wake up so that he can collect error status. 513 */ 514 void 515 udp_notify(inp, errno) 516 register struct inpcb *inp; 517 int errno; 518 { 519 inp->inp_socket->so_error = errno; 520 sorwakeup(inp->inp_socket); 521 sowwakeup(inp->inp_socket); 522 } 523 524 void 525 udp_ctlinput(cmd, sa, vip) 526 int cmd; 527 struct sockaddr *sa; 528 void *vip; 529 { 530 struct ip *ip = vip; 531 struct udphdr *uh; 532 void (*notify) __P((struct inpcb *, int)) = udp_notify; 533 struct in_addr faddr; 534 struct inpcb *inp; 535 int s; 536 537 faddr = ((struct sockaddr_in *)sa)->sin_addr; 538 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 539 return; 540 541 if (PRC_IS_REDIRECT(cmd)) { 542 ip = 0; 543 notify = in_rtchange; 544 } else if (cmd == PRC_HOSTDEAD) 545 ip = 0; 546 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 547 return; 548 if (ip) { 549 s = splnet(); 550 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 551 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport, 552 ip->ip_src, uh->uh_sport, 0, NULL); 553 if (inp != NULL && inp->inp_socket != NULL) 554 (*notify)(inp, inetctlerrmap[cmd]); 555 splx(s); 556 } else 557 in_pcbnotifyall(&udb, faddr, inetctlerrmap[cmd], notify); 558 } 559 560 static int 561 udp_pcblist(SYSCTL_HANDLER_ARGS) 562 { 563 int error, i, n, s; 564 struct inpcb *inp, **inp_list; 565 inp_gen_t gencnt; 566 struct xinpgen xig; 567 568 /* 569 * The process of preparing the TCB list is too time-consuming and 570 * resource-intensive to repeat twice on every request. 571 */ 572 if (req->oldptr == 0) { 573 n = udbinfo.ipi_count; 574 req->oldidx = 2 * (sizeof xig) 575 + (n + n/8) * sizeof(struct xinpcb); 576 return 0; 577 } 578 579 if (req->newptr != 0) 580 return EPERM; 581 582 /* 583 * OK, now we're committed to doing something. 584 */ 585 s = splnet(); 586 gencnt = udbinfo.ipi_gencnt; 587 n = udbinfo.ipi_count; 588 splx(s); 589 590 xig.xig_len = sizeof xig; 591 xig.xig_count = n; 592 xig.xig_gen = gencnt; 593 xig.xig_sogen = so_gencnt; 594 error = SYSCTL_OUT(req, &xig, sizeof xig); 595 if (error) 596 return error; 597 598 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 599 if (inp_list == 0) 600 return ENOMEM; 601 602 s = splnet(); 603 for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n; 604 inp = LIST_NEXT(inp, inp_list)) { 605 if (inp->inp_gencnt <= gencnt && !prison_xinpcb(req->p, inp)) 606 inp_list[i++] = inp; 607 } 608 splx(s); 609 n = i; 610 611 error = 0; 612 for (i = 0; i < n; i++) { 613 inp = inp_list[i]; 614 if (inp->inp_gencnt <= gencnt) { 615 struct xinpcb xi; 616 bzero(&xi, sizeof(xi)); 617 xi.xi_len = sizeof xi; 618 /* XXX should avoid extra copy */ 619 bcopy(inp, &xi.xi_inp, sizeof *inp); 620 if (inp->inp_socket) 621 sotoxsocket(inp->inp_socket, &xi.xi_socket); 622 error = SYSCTL_OUT(req, &xi, sizeof xi); 623 } 624 } 625 if (!error) { 626 /* 627 * Give the user an updated idea of our state. 628 * If the generation differs from what we told 629 * her before, she knows that something happened 630 * while we were processing this request, and it 631 * might be necessary to retry. 632 */ 633 s = splnet(); 634 xig.xig_gen = udbinfo.ipi_gencnt; 635 xig.xig_sogen = so_gencnt; 636 xig.xig_count = udbinfo.ipi_count; 637 splx(s); 638 error = SYSCTL_OUT(req, &xig, sizeof xig); 639 } 640 free(inp_list, M_TEMP); 641 return error; 642 } 643 644 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 645 udp_pcblist, "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, s; 653 654 error = suser(req->p); 655 if (error) 656 return (error); 657 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 658 if (error) 659 return (error); 660 s = splnet(); 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 splx(s); 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(inp, m, addr, control, p) 678 register struct inpcb *inp; 679 struct mbuf *m; 680 struct sockaddr *addr; 681 struct mbuf *control; 682 struct proc *p; 683 { 684 register struct udpiphdr *ui; 685 register int len = m->m_pkthdr.len; 686 struct in_addr faddr, laddr; 687 struct sockaddr_in *sin; 688 int s = 0, error = 0; 689 int ipflags; 690 691 if (control) 692 m_freem(control); /* XXX */ 693 694 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 695 error = EMSGSIZE; 696 goto release; 697 } 698 699 if (addr) { 700 sin = (struct sockaddr_in *)addr; 701 prison_remote_ip(p, 0, &sin->sin_addr.s_addr); 702 laddr = inp->inp_laddr; 703 if (inp->inp_faddr.s_addr != INADDR_ANY) { 704 error = EISCONN; 705 goto release; 706 } 707 /* 708 * Must block input while temporarily connected. 709 */ 710 s = splnet(); 711 error = in_pcbconnect(inp, addr, p); 712 if (error) { 713 splx(s); 714 goto release; 715 } 716 } else { 717 if (inp->inp_faddr.s_addr == INADDR_ANY) { 718 error = ENOTCONN; 719 goto release; 720 } 721 } 722 /* 723 * Calculate data length and get a mbuf 724 * for UDP and IP headers. 725 */ 726 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 727 if (m == 0) { 728 error = ENOBUFS; 729 if (addr) 730 splx(s); 731 goto release; 732 } 733 734 /* 735 * Fill in mbuf with extended UDP header 736 * and addresses and length put into network format. 737 */ 738 ui = mtod(m, struct udpiphdr *); 739 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ 740 ui->ui_pr = IPPROTO_UDP; 741 ui->ui_src = inp->inp_laddr; 742 ui->ui_dst = inp->inp_faddr; 743 ui->ui_sport = inp->inp_lport; 744 ui->ui_dport = inp->inp_fport; 745 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 746 747 ipflags = inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST); 748 if (inp->inp_flags & INP_ONESBCAST) 749 ipflags |= IP_SENDONES; 750 751 /* 752 * Set up checksum and output datagram. 753 */ 754 if (udpcksum) { 755 faddr = ui->ui_dst; 756 if (inp->inp_flags & INP_ONESBCAST) 757 faddr.s_addr = INADDR_BROADCAST; 758 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr, 759 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 760 m->m_pkthdr.csum_flags = CSUM_UDP; 761 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 762 } else { 763 ui->ui_sum = 0; 764 } 765 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 766 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 767 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 768 udpstat.udps_opackets++; 769 770 error = ip_output(m, inp->inp_options, &inp->inp_route, ipflags, 771 inp->inp_moptions, inp); 772 773 if (addr) { 774 in_pcbdisconnect(inp); 775 inp->inp_laddr = laddr; /* XXX rehash? */ 776 splx(s); 777 } 778 return (error); 779 780 release: 781 m_freem(m); 782 return (error); 783 } 784 785 u_long udp_sendspace = 9216; /* really max datagram size */ 786 /* 40 1K datagrams */ 787 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 788 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 789 790 u_long udp_recvspace = 40 * (1024 + 791 #ifdef INET6 792 sizeof(struct sockaddr_in6) 793 #else 794 sizeof(struct sockaddr_in) 795 #endif 796 ); 797 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 798 &udp_recvspace, 0, "Maximum incoming UDP datagram size"); 799 800 static int 801 udp_abort(struct socket *so) 802 { 803 struct inpcb *inp; 804 int s; 805 806 inp = sotoinpcb(so); 807 if (inp == 0) 808 return EINVAL; /* ??? possible? panic instead? */ 809 soisdisconnected(so); 810 s = splnet(); 811 in_pcbdetach(inp); 812 splx(s); 813 return 0; 814 } 815 816 static int 817 udp_attach(struct socket *so, int proto, struct proc *p) 818 { 819 struct inpcb *inp; 820 int s, error; 821 822 inp = sotoinpcb(so); 823 if (inp != 0) 824 return EINVAL; 825 826 error = soreserve(so, udp_sendspace, udp_recvspace); 827 if (error) 828 return error; 829 s = splnet(); 830 error = in_pcballoc(so, &udbinfo, p); 831 splx(s); 832 if (error) 833 return error; 834 835 inp = (struct inpcb *)so->so_pcb; 836 inp->inp_vflag |= INP_IPV4; 837 inp->inp_ip_ttl = ip_defttl; 838 return 0; 839 } 840 841 static int 842 udp_bind(struct socket *so, struct sockaddr *nam, struct proc *p) 843 { 844 struct inpcb *inp; 845 int s, error; 846 847 inp = sotoinpcb(so); 848 if (inp == 0) 849 return EINVAL; 850 s = splnet(); 851 error = in_pcbbind(inp, nam, p); 852 splx(s); 853 return error; 854 } 855 856 static int 857 udp_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 858 { 859 struct inpcb *inp; 860 int s, error; 861 struct sockaddr_in *sin; 862 863 inp = sotoinpcb(so); 864 if (inp == 0) 865 return EINVAL; 866 if (inp->inp_faddr.s_addr != INADDR_ANY) 867 return EISCONN; 868 error = 0; 869 s = splnet(); 870 if (inp->inp_laddr.s_addr == INADDR_ANY && p->p_prison != NULL) 871 error = in_pcbbind(inp, NULL, p); 872 if (error == 0) { 873 sin = (struct sockaddr_in *)nam; 874 prison_remote_ip(p, 0, &sin->sin_addr.s_addr); 875 error = in_pcbconnect(inp, nam, p); 876 } 877 splx(s); 878 if (error == 0) 879 soisconnected(so); 880 return error; 881 } 882 883 static int 884 udp_detach(struct socket *so) 885 { 886 struct inpcb *inp; 887 int s; 888 889 inp = sotoinpcb(so); 890 if (inp == 0) 891 return EINVAL; 892 s = splnet(); 893 in_pcbdetach(inp); 894 splx(s); 895 return 0; 896 } 897 898 static int 899 udp_disconnect(struct socket *so) 900 { 901 struct inpcb *inp; 902 int s; 903 904 inp = sotoinpcb(so); 905 if (inp == 0) 906 return EINVAL; 907 if (inp->inp_faddr.s_addr == INADDR_ANY) 908 return ENOTCONN; 909 910 s = splnet(); 911 in_pcbdisconnect(inp); 912 inp->inp_laddr.s_addr = INADDR_ANY; 913 splx(s); 914 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 915 return 0; 916 } 917 918 static int 919 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 920 struct mbuf *control, struct proc *p) 921 { 922 struct inpcb *inp; 923 924 inp = sotoinpcb(so); 925 if (inp == 0) { 926 m_freem(m); 927 return EINVAL; 928 } 929 return udp_output(inp, m, addr, control, p); 930 } 931 932 int 933 udp_shutdown(struct socket *so) 934 { 935 struct inpcb *inp; 936 937 inp = sotoinpcb(so); 938 if (inp == 0) 939 return EINVAL; 940 socantsendmore(so); 941 return 0; 942 } 943 944 struct pr_usrreqs udp_usrreqs = { 945 udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect, 946 pru_connect2_notsupp, in_control, udp_detach, udp_disconnect, 947 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp, 948 pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown, 949 in_setsockaddr, sosend, soreceive, sopoll 950 }; 951
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