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_inet6.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/malloc.h> 43 #include <sys/mbuf.h> 44 #include <sys/domain.h> 45 #include <sys/proc.h> 46 #include <sys/protosw.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/sysctl.h> 50 #include <sys/syslog.h> 51 52 #include <vm/vm_zone.h> 53 54 #include <net/if.h> 55 #include <net/route.h> 56 57 #include <netinet/in.h> 58 #include <netinet/in_systm.h> 59 #include <netinet/ip.h> 60 #ifdef INET6 61 #include <netinet/ip6.h> 62 #endif 63 #include <netinet/in_pcb.h> 64 #include <netinet/in_var.h> 65 #include <netinet/ip_var.h> 66 #ifdef INET6 67 #include <netinet6/ip6_var.h> 68 #endif 69 #include <netinet/ip_icmp.h> 70 #include <netinet/icmp_var.h> 71 #include <netinet/udp.h> 72 #include <netinet/udp_var.h> 73 74 #ifdef IPSEC 75 #include <netinet6/ipsec.h> 76 #endif /*IPSEC*/ 77 78 /* 79 * UDP protocol implementation. 80 * Per RFC 768, August, 1980. 81 */ 82 #ifndef COMPAT_42 83 static int udpcksum = 1; 84 #else 85 static int udpcksum = 0; /* XXX */ 86 #endif 87 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, 88 &udpcksum, 0, ""); 89 90 int log_in_vain = 0; 91 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 92 &log_in_vain, 0, "Log all incoming UDP packets"); 93 94 static int blackhole = 0; 95 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, 96 &blackhole, 0, "Do not send port unreachables for refused connects"); 97 98 struct inpcbhead udb; /* from udp_var.h */ 99 #define udb6 udb /* for KAME src sync over BSD*'s */ 100 struct inpcbinfo udbinfo; 101 102 #ifndef UDBHASHSIZE 103 #define UDBHASHSIZE 16 104 #endif 105 106 struct udpstat udpstat; /* from udp_var.h */ 107 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RD, 108 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); 109 110 static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; 111 #ifdef INET6 112 struct udp_in6 { 113 struct sockaddr_in6 uin6_sin; 114 u_char uin6_init_done : 1; 115 } udp_in6 = { 116 { sizeof(udp_in6.uin6_sin), AF_INET6 }, 117 0 118 }; 119 struct udp_ip6 { 120 struct ip6_hdr uip6_ip6; 121 u_char uip6_init_done : 1; 122 } udp_ip6; 123 #endif /* INET6 */ 124 125 static void udp_append __P((struct inpcb *last, struct ip *ip, 126 struct mbuf *n, int off)); 127 #ifdef INET6 128 static void ip_2_ip6_hdr __P((struct ip6_hdr *ip6, struct ip *ip)); 129 #endif 130 131 static int udp_detach __P((struct socket *so)); 132 static int udp_output __P((struct inpcb *, struct mbuf *, struct sockaddr *, 133 struct mbuf *, struct proc *)); 134 135 void 136 udp_init() 137 { 138 LIST_INIT(&udb); 139 udbinfo.listhead = &udb; 140 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask); 141 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB, 142 &udbinfo.porthashmask); 143 udbinfo.ipi_zone = zinit("udpcb", sizeof(struct inpcb), maxsockets, 144 ZONE_INTERRUPT, 0); 145 } 146 147 void 148 udp_input(m, off, proto) 149 register struct mbuf *m; 150 int off, proto; 151 { 152 int iphlen = off; 153 register struct ip *ip; 154 register struct udphdr *uh; 155 register struct inpcb *inp; 156 struct mbuf *opts = 0; 157 int len; 158 struct ip save_ip; 159 struct sockaddr *append_sa; 160 161 udpstat.udps_ipackets++; 162 163 /* 164 * Strip IP options, if any; should skip this, 165 * make available to user, and use on returned packets, 166 * but we don't yet have a way to check the checksum 167 * with options still present. 168 */ 169 if (iphlen > sizeof (struct ip)) { 170 ip_stripoptions(m, (struct mbuf *)0); 171 iphlen = sizeof(struct ip); 172 } 173 174 /* 175 * Get IP and UDP header together in first mbuf. 176 */ 177 ip = mtod(m, struct ip *); 178 if (m->m_len < iphlen + sizeof(struct udphdr)) { 179 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { 180 udpstat.udps_hdrops++; 181 return; 182 } 183 ip = mtod(m, struct ip *); 184 } 185 uh = (struct udphdr *)((caddr_t)ip + iphlen); 186 187 /* 188 * Make mbuf data length reflect UDP length. 189 * If not enough data to reflect UDP length, drop. 190 */ 191 len = ntohs((u_short)uh->uh_ulen); 192 if (ip->ip_len != len) { 193 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 194 udpstat.udps_badlen++; 195 goto bad; 196 } 197 m_adj(m, len - ip->ip_len); 198 /* ip->ip_len = len; */ 199 } 200 /* 201 * Save a copy of the IP header in case we want restore it 202 * for sending an ICMP error message in response. 203 */ 204 save_ip = *ip; 205 206 /* 207 * Checksum extended UDP header and data. 208 */ 209 if (uh->uh_sum) { 210 bzero(((struct ipovly *)ip)->ih_x1, 9); 211 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 212 uh->uh_sum = in_cksum(m, len + sizeof (struct ip)); 213 if (uh->uh_sum) { 214 udpstat.udps_badsum++; 215 m_freem(m); 216 return; 217 } 218 } 219 220 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 221 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { 222 struct inpcb *last; 223 /* 224 * Deliver a multicast or broadcast datagram to *all* sockets 225 * for which the local and remote addresses and ports match 226 * those of the incoming datagram. This allows more than 227 * one process to receive multi/broadcasts on the same port. 228 * (This really ought to be done for unicast datagrams as 229 * well, but that would cause problems with existing 230 * applications that open both address-specific sockets and 231 * a wildcard socket listening to the same port -- they would 232 * end up receiving duplicates of every unicast datagram. 233 * Those applications open the multiple sockets to overcome an 234 * inadequacy of the UDP socket interface, but for backwards 235 * compatibility we avoid the problem here rather than 236 * fixing the interface. Maybe 4.5BSD will remedy this?) 237 */ 238 239 /* 240 * Construct sockaddr format source address. 241 */ 242 udp_in.sin_port = uh->uh_sport; 243 udp_in.sin_addr = ip->ip_src; 244 /* 245 * Locate pcb(s) for datagram. 246 * (Algorithm copied from raw_intr().) 247 */ 248 last = NULL; 249 #ifdef INET6 250 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0; 251 #endif 252 LIST_FOREACH(inp, &udb, inp_list) { 253 #ifdef INET6 254 if ((inp->inp_vflag & INP_IPV4) == NULL) 255 continue; 256 #endif 257 if (inp->inp_lport != uh->uh_dport) 258 continue; 259 if (inp->inp_laddr.s_addr != INADDR_ANY) { 260 if (inp->inp_laddr.s_addr != 261 ip->ip_dst.s_addr) 262 continue; 263 } 264 if (inp->inp_faddr.s_addr != INADDR_ANY) { 265 if (inp->inp_faddr.s_addr != 266 ip->ip_src.s_addr || 267 inp->inp_fport != uh->uh_sport) 268 continue; 269 } 270 271 if (last != NULL) { 272 struct mbuf *n; 273 274 #ifdef IPSEC 275 /* check AH/ESP integrity. */ 276 if (ipsec4_in_reject_so(m, last->inp_socket)) 277 ipsecstat.in_polvio++; 278 /* do not inject data to pcb */ 279 else 280 #endif /*IPSEC*/ 281 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 282 udp_append(last, ip, n, 283 iphlen + 284 sizeof(struct udphdr)); 285 } 286 last = inp; 287 /* 288 * Don't look for additional matches if this one does 289 * not have either the SO_REUSEPORT or SO_REUSEADDR 290 * socket options set. This heuristic avoids searching 291 * through all pcbs in the common case of a non-shared 292 * port. It * assumes that an application will never 293 * clear these options after setting them. 294 */ 295 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0) 296 break; 297 } 298 299 if (last == NULL) { 300 /* 301 * No matching pcb found; discard datagram. 302 * (No need to send an ICMP Port Unreachable 303 * for a broadcast or multicast datgram.) 304 */ 305 udpstat.udps_noportbcast++; 306 goto bad; 307 } 308 #ifdef IPSEC 309 /* check AH/ESP integrity. */ 310 if (ipsec4_in_reject_so(m, last->inp_socket)) { 311 ipsecstat.in_polvio++; 312 goto bad; 313 } 314 #endif /*IPSEC*/ 315 udp_append(last, ip, m, iphlen + sizeof(struct udphdr)); 316 return; 317 } 318 /* 319 * Locate pcb for datagram. 320 */ 321 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, 322 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 323 if (inp == NULL) { 324 if (log_in_vain) { 325 char buf[4*sizeof "123"]; 326 327 strcpy(buf, inet_ntoa(ip->ip_dst)); 328 log(LOG_INFO, 329 "Connection attempt to UDP %s:%d from %s:%d\n", 330 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 331 ntohs(uh->uh_sport)); 332 } 333 udpstat.udps_noport++; 334 if (m->m_flags & (M_BCAST | M_MCAST)) { 335 udpstat.udps_noportbcast++; 336 goto bad; 337 } 338 *ip = save_ip; 339 #ifdef ICMP_BANDLIM 340 if (badport_bandlim(0) < 0) 341 goto bad; 342 #endif 343 if (!blackhole) 344 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 345 else 346 goto bad; 347 return; 348 } 349 #ifdef IPSEC 350 if (ipsec4_in_reject_so(m, inp->inp_socket)) { 351 ipsecstat.in_polvio++; 352 goto bad; 353 } 354 #endif /*IPSEC*/ 355 356 /* 357 * Construct sockaddr format source address. 358 * Stuff source address and datagram in user buffer. 359 */ 360 udp_in.sin_port = uh->uh_sport; 361 udp_in.sin_addr = ip->ip_src; 362 if (inp->inp_flags & INP_CONTROLOPTS 363 || inp->inp_socket->so_options & SO_TIMESTAMP) { 364 #ifdef INET6 365 if (inp->inp_vflag & INP_IPV6) { 366 int savedflags; 367 368 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 369 savedflags = inp->inp_flags; 370 inp->inp_flags &= ~INP_UNMAPPABLEOPTS; 371 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m); 372 inp->inp_flags = savedflags; 373 } else 374 #endif 375 ip_savecontrol(inp, &opts, ip, m); 376 } 377 iphlen += sizeof(struct udphdr); 378 m_adj(m, iphlen); 379 #ifdef INET6 380 if (inp->inp_vflag & INP_IPV6) { 381 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 382 append_sa = (struct sockaddr *)&udp_in6; 383 } else 384 #endif 385 append_sa = (struct sockaddr *)&udp_in; 386 if (sbappendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) { 387 udpstat.udps_fullsock++; 388 goto bad; 389 } 390 sorwakeup(inp->inp_socket); 391 return; 392 bad: 393 m_freem(m); 394 if (opts) 395 m_freem(opts); 396 return; 397 } 398 399 #if defined(INET6) 400 static void 401 ip_2_ip6_hdr(ip6, ip) 402 struct ip6_hdr *ip6; 403 struct ip *ip; 404 { 405 bzero(ip6, sizeof(*ip6)); 406 407 ip6->ip6_vfc = IPV6_VERSION; 408 ip6->ip6_plen = ip->ip_len; 409 ip6->ip6_nxt = ip->ip_p; 410 ip6->ip6_hlim = ip->ip_ttl; 411 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] = 412 IPV6_ADDR_INT32_SMP; 413 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr; 414 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr; 415 } 416 #endif 417 418 /* 419 * subroutine of udp_input(), mainly for source code readability. 420 * caller must properly init udp_ip6 and udp_in6 beforehand. 421 */ 422 static void 423 udp_append(last, ip, n, off) 424 struct inpcb *last; 425 struct ip *ip; 426 struct mbuf *n; 427 int off; 428 { 429 struct sockaddr *append_sa; 430 struct mbuf *opts = 0; 431 432 if (last->inp_flags & INP_CONTROLOPTS || 433 last->inp_socket->so_options & SO_TIMESTAMP) { 434 #ifdef INET6 435 if (last->inp_vflag & INP_IPV6) { 436 int savedflags; 437 438 if (udp_ip6.uip6_init_done == 0) { 439 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 440 udp_ip6.uip6_init_done = 1; 441 } 442 savedflags = last->inp_flags; 443 last->inp_flags &= ~INP_UNMAPPABLEOPTS; 444 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n); 445 last->inp_flags = savedflags; 446 } else 447 #endif 448 ip_savecontrol(last, &opts, ip, n); 449 } 450 #ifdef INET6 451 if (last->inp_vflag & INP_IPV6) { 452 if (udp_in6.uin6_init_done == 0) { 453 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 454 udp_in6.uin6_init_done = 1; 455 } 456 append_sa = (struct sockaddr *)&udp_in6.uin6_sin; 457 } else 458 #endif 459 append_sa = (struct sockaddr *)&udp_in; 460 m_adj(n, off); 461 if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) { 462 m_freem(n); 463 if (opts) 464 m_freem(opts); 465 udpstat.udps_fullsock++; 466 } else 467 sorwakeup(last->inp_socket); 468 } 469 470 /* 471 * Notify a udp user of an asynchronous error; 472 * just wake up so that he can collect error status. 473 */ 474 void 475 udp_notify(inp, errno) 476 register struct inpcb *inp; 477 int errno; 478 { 479 inp->inp_socket->so_error = errno; 480 sorwakeup(inp->inp_socket); 481 sowwakeup(inp->inp_socket); 482 } 483 484 void 485 udp_ctlinput(cmd, sa, vip) 486 int cmd; 487 struct sockaddr *sa; 488 void *vip; 489 { 490 register struct ip *ip = vip; 491 register struct udphdr *uh; 492 493 if (!PRC_IS_REDIRECT(cmd) && 494 ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)) 495 return; 496 if (ip) { 497 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 498 in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport, 499 cmd, udp_notify); 500 } else 501 in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify); 502 } 503 504 static int 505 udp_pcblist SYSCTL_HANDLER_ARGS 506 { 507 int error, i, n, s; 508 struct inpcb *inp, **inp_list; 509 inp_gen_t gencnt; 510 struct xinpgen xig; 511 512 /* 513 * The process of preparing the TCB list is too time-consuming and 514 * resource-intensive to repeat twice on every request. 515 */ 516 if (req->oldptr == 0) { 517 n = udbinfo.ipi_count; 518 req->oldidx = 2 * (sizeof xig) 519 + (n + n/8) * sizeof(struct xinpcb); 520 return 0; 521 } 522 523 if (req->newptr != 0) 524 return EPERM; 525 526 /* 527 * OK, now we're committed to doing something. 528 */ 529 s = splnet(); 530 gencnt = udbinfo.ipi_gencnt; 531 n = udbinfo.ipi_count; 532 splx(s); 533 534 xig.xig_len = sizeof xig; 535 xig.xig_count = n; 536 xig.xig_gen = gencnt; 537 xig.xig_sogen = so_gencnt; 538 error = SYSCTL_OUT(req, &xig, sizeof xig); 539 if (error) 540 return error; 541 542 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 543 if (inp_list == 0) 544 return ENOMEM; 545 546 s = splnet(); 547 for (inp = udbinfo.listhead->lh_first, i = 0; inp && i < n; 548 inp = inp->inp_list.le_next) { 549 if (inp->inp_gencnt <= gencnt && !prison_xinpcb(req->p, inp)) 550 inp_list[i++] = inp; 551 } 552 splx(s); 553 n = i; 554 555 error = 0; 556 for (i = 0; i < n; i++) { 557 inp = inp_list[i]; 558 if (inp->inp_gencnt <= gencnt) { 559 struct xinpcb xi; 560 xi.xi_len = sizeof xi; 561 /* XXX should avoid extra copy */ 562 bcopy(inp, &xi.xi_inp, sizeof *inp); 563 if (inp->inp_socket) 564 sotoxsocket(inp->inp_socket, &xi.xi_socket); 565 error = SYSCTL_OUT(req, &xi, sizeof xi); 566 } 567 } 568 if (!error) { 569 /* 570 * Give the user an updated idea of our state. 571 * If the generation differs from what we told 572 * her before, she knows that something happened 573 * while we were processing this request, and it 574 * might be necessary to retry. 575 */ 576 s = splnet(); 577 xig.xig_gen = udbinfo.ipi_gencnt; 578 xig.xig_sogen = so_gencnt; 579 xig.xig_count = udbinfo.ipi_count; 580 splx(s); 581 error = SYSCTL_OUT(req, &xig, sizeof xig); 582 } 583 free(inp_list, M_TEMP); 584 return error; 585 } 586 587 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 588 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 589 590 static int 591 udp_getcred SYSCTL_HANDLER_ARGS 592 { 593 struct sockaddr_in addrs[2]; 594 struct inpcb *inp; 595 int error, s; 596 597 error = suser(req->p); 598 if (error) 599 return (error); 600 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 601 if (error) 602 return (error); 603 s = splnet(); 604 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 605 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 606 if (inp == NULL || inp->inp_socket == NULL) { 607 error = ENOENT; 608 goto out; 609 } 610 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(struct ucred)); 611 out: 612 splx(s); 613 return (error); 614 } 615 616 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 617 0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection"); 618 619 static int 620 udp_output(inp, m, addr, control, p) 621 register struct inpcb *inp; 622 struct mbuf *m; 623 struct sockaddr *addr; 624 struct mbuf *control; 625 struct proc *p; 626 { 627 register struct udpiphdr *ui; 628 register int len = m->m_pkthdr.len; 629 struct in_addr laddr; 630 struct sockaddr_in *sin; 631 int s = 0, error = 0; 632 633 if (control) 634 m_freem(control); /* XXX */ 635 636 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 637 error = EMSGSIZE; 638 goto release; 639 } 640 641 if (addr) { 642 sin = (struct sockaddr_in *)addr; 643 prison_remote_ip(p, 0, &sin->sin_addr.s_addr); 644 laddr = inp->inp_laddr; 645 if (inp->inp_faddr.s_addr != INADDR_ANY) { 646 error = EISCONN; 647 goto release; 648 } 649 /* 650 * Must block input while temporarily connected. 651 */ 652 s = splnet(); 653 error = in_pcbconnect(inp, addr, p); 654 if (error) { 655 splx(s); 656 goto release; 657 } 658 } else { 659 if (inp->inp_faddr.s_addr == INADDR_ANY) { 660 error = ENOTCONN; 661 goto release; 662 } 663 } 664 /* 665 * Calculate data length and get a mbuf 666 * for UDP and IP headers. 667 */ 668 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 669 if (m == 0) { 670 error = ENOBUFS; 671 if (addr) 672 splx(s); 673 goto release; 674 } 675 676 /* 677 * Fill in mbuf with extended UDP header 678 * and addresses and length put into network format. 679 */ 680 ui = mtod(m, struct udpiphdr *); 681 bzero(ui->ui_x1, sizeof(ui->ui_x1)); 682 ui->ui_pr = IPPROTO_UDP; 683 ui->ui_len = htons((u_short)len + sizeof (struct udphdr)); 684 ui->ui_src = inp->inp_laddr; 685 ui->ui_dst = inp->inp_faddr; 686 ui->ui_sport = inp->inp_lport; 687 ui->ui_dport = inp->inp_fport; 688 ui->ui_ulen = ui->ui_len; 689 690 /* 691 * Stuff checksum and output datagram. 692 */ 693 ui->ui_sum = 0; 694 if (udpcksum) { 695 if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0) 696 ui->ui_sum = 0xffff; 697 } 698 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 699 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 700 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 701 udpstat.udps_opackets++; 702 703 #ifdef IPSEC 704 m->m_pkthdr.rcvif = (struct ifnet *)inp->inp_socket; 705 #endif /*IPSEC*/ 706 707 error = ip_output(m, inp->inp_options, &inp->inp_route, 708 inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), 709 inp->inp_moptions); 710 711 if (addr) { 712 in_pcbdisconnect(inp); 713 inp->inp_laddr = laddr; /* XXX rehash? */ 714 splx(s); 715 } 716 return (error); 717 718 release: 719 m_freem(m); 720 return (error); 721 } 722 723 u_long udp_sendspace = 9216; /* really max datagram size */ 724 /* 40 1K datagrams */ 725 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 726 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 727 728 u_long udp_recvspace = 40 * (1024 + 729 #ifdef INET6 730 sizeof(struct sockaddr_in6) 731 #else 732 sizeof(struct sockaddr_in) 733 #endif 734 ); 735 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 736 &udp_recvspace, 0, "Maximum incoming UDP datagram size"); 737 738 static int 739 udp_abort(struct socket *so) 740 { 741 struct inpcb *inp; 742 int s; 743 744 inp = sotoinpcb(so); 745 if (inp == 0) 746 return EINVAL; /* ??? possible? panic instead? */ 747 soisdisconnected(so); 748 s = splnet(); 749 in_pcbdetach(inp); 750 splx(s); 751 return 0; 752 } 753 754 static int 755 udp_attach(struct socket *so, int proto, struct proc *p) 756 { 757 struct inpcb *inp; 758 int s, error; 759 760 inp = sotoinpcb(so); 761 if (inp != 0) 762 return EINVAL; 763 764 error = soreserve(so, udp_sendspace, udp_recvspace); 765 if (error) 766 return error; 767 s = splnet(); 768 error = in_pcballoc(so, &udbinfo, p); 769 splx(s); 770 if (error) 771 return error; 772 773 inp = (struct inpcb *)so->so_pcb; 774 inp->inp_vflag |= INP_IPV4; 775 inp->inp_ip_ttl = ip_defttl; 776 #ifdef IPSEC 777 error = ipsec_init_policy(so, &inp->inp_sp); 778 if (error != 0) { 779 in_pcbdetach(inp); 780 return error; 781 } 782 #endif /*IPSEC*/ 783 return 0; 784 } 785 786 static int 787 udp_bind(struct socket *so, struct sockaddr *nam, struct proc *p) 788 { 789 struct inpcb *inp; 790 int s, error; 791 792 inp = sotoinpcb(so); 793 if (inp == 0) 794 return EINVAL; 795 s = splnet(); 796 error = in_pcbbind(inp, nam, p); 797 splx(s); 798 return error; 799 } 800 801 static int 802 udp_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 803 { 804 struct inpcb *inp; 805 int s, error; 806 struct sockaddr_in *sin; 807 808 inp = sotoinpcb(so); 809 if (inp == 0) 810 return EINVAL; 811 if (inp->inp_faddr.s_addr != INADDR_ANY) 812 return EISCONN; 813 s = splnet(); 814 sin = (struct sockaddr_in *)nam; 815 prison_remote_ip(p, 0, &sin->sin_addr.s_addr); 816 error = in_pcbconnect(inp, nam, p); 817 splx(s); 818 if (error == 0) 819 soisconnected(so); 820 return error; 821 } 822 823 static int 824 udp_detach(struct socket *so) 825 { 826 struct inpcb *inp; 827 int s; 828 829 inp = sotoinpcb(so); 830 if (inp == 0) 831 return EINVAL; 832 s = splnet(); 833 in_pcbdetach(inp); 834 splx(s); 835 return 0; 836 } 837 838 static int 839 udp_disconnect(struct socket *so) 840 { 841 struct inpcb *inp; 842 int s; 843 844 inp = sotoinpcb(so); 845 if (inp == 0) 846 return EINVAL; 847 if (inp->inp_faddr.s_addr == INADDR_ANY) 848 return ENOTCONN; 849 850 s = splnet(); 851 in_pcbdisconnect(inp); 852 inp->inp_laddr.s_addr = INADDR_ANY; 853 splx(s); 854 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 855 return 0; 856 } 857 858 static int 859 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 860 struct mbuf *control, struct proc *p) 861 { 862 struct inpcb *inp; 863 864 inp = sotoinpcb(so); 865 if (inp == 0) { 866 m_freem(m); 867 return EINVAL; 868 } 869 return udp_output(inp, m, addr, control, p); 870 } 871 872 int 873 udp_shutdown(struct socket *so) 874 { 875 struct inpcb *inp; 876 877 inp = sotoinpcb(so); 878 if (inp == 0) 879 return EINVAL; 880 socantsendmore(so); 881 return 0; 882 } 883 884 struct pr_usrreqs udp_usrreqs = { 885 udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect, 886 pru_connect2_notsupp, in_control, udp_detach, udp_disconnect, 887 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp, 888 pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown, 889 in_setsockaddr, sosend, soreceive, sopoll 890 }; 891 892