1/* 2 * Copyright (c) 2000-2013 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 29 30/* $FreeBSD: src/sys/netinet6/udp6_output.c,v 1.1.2.3 2001/08/31 13:49:58 jlemon Exp $ */ 31/* $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $ */ 32 33/* 34 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 35 * All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the project nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 */ 61 62/* 63 * Copyright (c) 1982, 1986, 1989, 1993 64 * The Regents of the University of California. All rights reserved. 65 * 66 * Redistribution and use in source and binary forms, with or without 67 * modification, are permitted provided that the following conditions 68 * are met: 69 * 1. Redistributions of source code must retain the above copyright 70 * notice, this list of conditions and the following disclaimer. 71 * 2. Redistributions in binary form must reproduce the above copyright 72 * notice, this list of conditions and the following disclaimer in the 73 * documentation and/or other materials provided with the distribution. 74 * 3. All advertising materials mentioning features or use of this software 75 * must display the following acknowledgement: 76 * This product includes software developed by the University of 77 * California, Berkeley and its contributors. 78 * 4. Neither the name of the University nor the names of its contributors 79 * may be used to endorse or promote products derived from this software 80 * without specific prior written permission. 81 * 82 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 83 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 84 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 85 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 86 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 87 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 88 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 89 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 90 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 91 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 92 * SUCH DAMAGE. 93 * 94 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93 95 */ 96 97#include <sys/param.h> 98#include <sys/malloc.h> 99#include <sys/mbuf.h> 100#include <sys/protosw.h> 101#include <sys/socket.h> 102#include <sys/socketvar.h> 103#include <sys/sysctl.h> 104#include <sys/errno.h> 105#include <sys/stat.h> 106#include <sys/systm.h> 107#include <sys/proc.h> 108#include <sys/syslog.h> 109 110#include <machine/endian.h> 111 112#include <net/if.h> 113#include <net/route.h> 114#include <net/if_types.h> 115#include <net/ntstat.h> 116 117#include <netinet/in.h> 118#include <netinet/in_var.h> 119#include <netinet/in_systm.h> 120#include <netinet/ip.h> 121#include <netinet/ip_var.h> 122#include <netinet/in_pcb.h> 123#include <netinet/udp.h> 124#include <netinet/udp_var.h> 125#include <netinet/ip6.h> 126#include <netinet6/ip6_var.h> 127#include <netinet6/in6_pcb.h> 128#include <netinet6/udp6_var.h> 129#include <netinet/icmp6.h> 130#include <netinet6/ip6protosw.h> 131 132#if IPSEC 133#include <netinet6/ipsec.h> 134#include <netinet6/ipsec6.h> 135extern int ipsec_bypass; 136#endif /* IPSEC */ 137 138#include <net/net_osdep.h> 139 140/* 141 * UDP protocol inplementation. 142 * Per RFC 768, August, 1980. 143 */ 144 145int 146udp6_output(struct in6pcb *in6p, struct mbuf *m, struct sockaddr *addr6, 147 struct mbuf *control, struct proc *p) 148{ 149 u_int32_t ulen = m->m_pkthdr.len; 150 u_int32_t plen = sizeof (struct udphdr) + ulen; 151 struct ip6_hdr *ip6; 152 struct udphdr *udp6; 153 struct in6_addr *laddr, *faddr; 154 u_short fport; 155 int error = 0; 156 struct ip6_pktopts opt, *optp = NULL; 157 struct ip6_moptions *im6o; 158 int af = AF_INET6, hlen = sizeof (struct ip6_hdr); 159 int flags; 160 struct sockaddr_in6 tmp; 161 struct in6_addr storage; 162 mbuf_svc_class_t msc = MBUF_SC_UNSPEC; 163 struct ip6_out_args ip6oa = 164 { IFSCOPE_NONE, { 0 }, IP6OAF_SELECT_SRCIF, 0 }; 165 struct flowadv *adv = &ip6oa.ip6oa_flowadv; 166 struct socket *so = in6p->in6p_socket; 167 struct route_in6 ro; 168 int flowadv = 0; 169 170 /* Enable flow advisory only when connected */ 171 flowadv = (so->so_state & SS_ISCONNECTED) ? 1 : 0; 172 173 if (flowadv && INP_WAIT_FOR_IF_FEEDBACK(in6p)) { 174 error = ENOBUFS; 175 goto release; 176 } 177 178 if (in6p->inp_flags & INP_BOUND_IF) { 179 ip6oa.ip6oa_boundif = in6p->inp_boundifp->if_index; 180 ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF; 181 } 182 if (in6p->inp_flags & INP_NO_IFT_CELLULAR) 183 ip6oa.ip6oa_flags |= IP6OAF_NO_CELLULAR; 184 185 if (control) { 186 msc = mbuf_service_class_from_control(control); 187 if ((error = ip6_setpktopts(control, &opt, 188 NULL, IPPROTO_UDP)) != 0) 189 goto release; 190 optp = &opt; 191 } else 192 optp = in6p->in6p_outputopts; 193 194 if (addr6) { 195 /* 196 * IPv4 version of udp_output calls in_pcbconnect in this case, 197 * which has its costs. 198 * 199 * Since we saw no essential reason for calling in_pcbconnect, 200 * we get rid of such kind of logic, and call in6_selectsrc 201 * and in6_pcbsetport in order to fill in the local address 202 * and the local port. 203 */ 204 struct sockaddr_in6 *sin6 = 205 (struct sockaddr_in6 *)(void *)addr6; 206 207 if (sin6->sin6_port == 0) { 208 error = EADDRNOTAVAIL; 209 goto release; 210 } 211 212 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 213 /* how about ::ffff:0.0.0.0 case? */ 214 error = EISCONN; 215 goto release; 216 } 217 218 /* protect *sin6 from overwrites */ 219 tmp = *sin6; 220 sin6 = &tmp; 221 222 faddr = &sin6->sin6_addr; 223 fport = sin6->sin6_port; /* allow 0 port */ 224 225 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 226 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) { 227 /* 228 * I believe we should explicitly discard the 229 * packet when mapped addresses are disabled, 230 * rather than send the packet as an IPv6 one. 231 * If we chose the latter approach, the packet 232 * might be sent out on the wire based on the 233 * default route, the situation which we'd 234 * probably want to avoid. 235 * (20010421 jinmei@kame.net) 236 */ 237 error = EINVAL; 238 goto release; 239 } else { 240 af = AF_INET; 241 } 242 } 243 244 /* KAME hack: embed scopeid */ 245 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL, 246 optp) != 0) { 247 error = EINVAL; 248 goto release; 249 } 250 251 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 252 laddr = in6_selectsrc(sin6, optp, 253 in6p, &in6p->in6p_route, NULL, &storage, 254 ip6oa.ip6oa_boundif, &error); 255 } else 256 laddr = &in6p->in6p_laddr; /* XXX */ 257 if (laddr == NULL) { 258 if (error == 0) 259 error = EADDRNOTAVAIL; 260 goto release; 261 } 262 if (in6p->in6p_lport == 0 && 263 (error = in6_pcbsetport(laddr, in6p, p, 0)) != 0) 264 goto release; 265 } else { 266 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 267 error = ENOTCONN; 268 goto release; 269 } 270 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) { 271 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) { 272 /* 273 * XXX: this case would happen when the 274 * application sets the V6ONLY flag after 275 * connecting the foreign address. 276 * Such applications should be fixed, 277 * so we bark here. 278 */ 279 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 280 "option was set for a connected socket\n"); 281 error = EINVAL; 282 goto release; 283 } else 284 af = AF_INET; 285 } 286 laddr = &in6p->in6p_laddr; 287 faddr = &in6p->in6p_faddr; 288 fport = in6p->in6p_fport; 289 } 290 291 if (in6p->inp_flowhash == 0) 292 in6p->inp_flowhash = inp_calc_flowhash(in6p); 293 /* update flowinfo - RFC 6437 */ 294 if (in6p->inp_flow == 0 && in6p->in6p_flags & IN6P_AUTOFLOWLABEL) { 295 in6p->inp_flow &= ~IPV6_FLOWLABEL_MASK; 296 in6p->inp_flow |= 297 (htonl(in6p->inp_flowhash) & IPV6_FLOWLABEL_MASK); 298 } 299 300 if (af == AF_INET) 301 hlen = sizeof (struct ip); 302 303 /* 304 * Calculate data length and get a mbuf 305 * for UDP and IP6 headers. 306 */ 307 M_PREPEND(m, hlen + sizeof (struct udphdr), M_DONTWAIT); 308 if (m == 0) { 309 error = ENOBUFS; 310 goto release; 311 } 312 313 /* 314 * Stuff checksum and output datagram. 315 */ 316 udp6 = (struct udphdr *)(void *)(mtod(m, caddr_t) + hlen); 317 udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */ 318 udp6->uh_dport = fport; 319 if (plen <= 0xffff) 320 udp6->uh_ulen = htons((u_short)plen); 321 else 322 udp6->uh_ulen = 0; 323 udp6->uh_sum = 0; 324 325 switch (af) { 326 case AF_INET6: 327 ip6 = mtod(m, struct ip6_hdr *); 328 ip6->ip6_flow = in6p->inp_flow & IPV6_FLOWINFO_MASK; 329 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 330 ip6->ip6_vfc |= IPV6_VERSION; 331#if 0 /* ip6_plen will be filled in ip6_output. */ 332 ip6->ip6_plen = htons((u_short)plen); 333#endif 334 ip6->ip6_nxt = IPPROTO_UDP; 335 ip6->ip6_hlim = in6_selecthlim(in6p, in6p->in6p_route.ro_rt ? 336 in6p->in6p_route.ro_rt->rt_ifp : NULL); 337 ip6->ip6_src = *laddr; 338 ip6->ip6_dst = *faddr; 339 340 udp6->uh_sum = in6_pseudo(laddr, faddr, 341 htonl(plen + IPPROTO_UDP)); 342 m->m_pkthdr.csum_flags = CSUM_UDPIPV6; 343 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 344 345 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 346 ip6oa.ip6oa_flags |= IP6OAF_BOUND_SRCADDR; 347 348 flags = IPV6_OUTARGS; 349 350 udp6stat.udp6s_opackets++; 351#if IPSEC 352 if (ipsec_bypass == 0 && ipsec_setsocket(m, so) != 0) { 353 error = ENOBUFS; 354 goto release; 355 } 356#endif /* IPSEC */ 357 358 /* In case of IPv4-mapped address used in previous send */ 359 if (ROUTE_UNUSABLE(&in6p->in6p_route) || 360 rt_key(in6p->in6p_route.ro_rt)->sa_family != AF_INET6) 361 ROUTE_RELEASE(&in6p->in6p_route); 362 363 /* Copy the cached route and take an extra reference */ 364 in6p_route_copyout(in6p, &ro); 365 366 set_packet_service_class(m, so, msc, PKT_SCF_IPV6); 367 368 m->m_pkthdr.pkt_flowsrc = FLOWSRC_INPCB; 369 m->m_pkthdr.pkt_flowid = in6p->inp_flowhash; 370 m->m_pkthdr.pkt_proto = IPPROTO_UDP; 371 m->m_pkthdr.pkt_flags |= (PKTF_FLOW_ID | PKTF_FLOW_LOCALSRC); 372 if (flowadv) 373 m->m_pkthdr.pkt_flags |= PKTF_FLOW_ADV; 374 375 im6o = in6p->in6p_moptions; 376 if (im6o != NULL) { 377 IM6O_LOCK(im6o); 378 IM6O_ADDREF_LOCKED(im6o); 379 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 380 im6o->im6o_multicast_ifp != NULL) { 381 in6p->in6p_last_outifp = 382 im6o->im6o_multicast_ifp; 383 } 384 IM6O_UNLOCK(im6o); 385 } 386 387 in6p->inp_sndinprog_cnt++; 388 389 socket_unlock(so, 0); 390 error = ip6_output(m, optp, &ro, flags, im6o, NULL, &ip6oa); 391 m = NULL; 392 socket_lock(so, 0); 393 394 if (im6o != NULL) 395 IM6O_REMREF(im6o); 396 397 if (error == 0 && nstat_collect) { 398 boolean_t cell, wifi; 399 400 if (in6p->in6p_route.ro_rt != NULL) { 401 cell = IFNET_IS_CELLULAR(in6p->in6p_route. 402 ro_rt->rt_ifp); 403 wifi = (!cell && IFNET_IS_WIFI(in6p->in6p_route. 404 ro_rt->rt_ifp)); 405 } else { 406 cell = wifi = FALSE; 407 } 408 INP_ADD_STAT(in6p, cell, wifi, txpackets, 1); 409 INP_ADD_STAT(in6p, cell, wifi, txbytes, ulen); 410 } 411 412 if (flowadv && (adv->code == FADV_FLOW_CONTROLLED || 413 adv->code == FADV_SUSPENDED)) { 414 /* 415 * Return an error to indicate 416 * that the packet has been dropped. 417 */ 418 error = ENOBUFS; 419 inp_set_fc_state(in6p, adv->code); 420 } 421 422 VERIFY(in6p->inp_sndinprog_cnt > 0); 423 if ( --in6p->inp_sndinprog_cnt == 0) 424 in6p->inp_flags &= ~(INP_FC_FEEDBACK); 425 426 /* Synchronize PCB cached route */ 427 in6p_route_copyin(in6p, &ro); 428 429 if (in6p->in6p_route.ro_rt != NULL) { 430 struct rtentry *rt = in6p->in6p_route.ro_rt; 431 struct ifnet *outif; 432 433 if (rt->rt_flags & RTF_MULTICAST) 434 rt = NULL; /* unusable */ 435 436 /* 437 * Always discard the cached route for unconnected 438 * socket or if it is a multicast route. 439 */ 440 if (rt == NULL) 441 ROUTE_RELEASE(&in6p->in6p_route); 442 443 /* 444 * If the destination route is unicast, update outif 445 * with that of the route interface used by IP. 446 */ 447 if (rt != NULL && 448 (outif = rt->rt_ifp) != in6p->in6p_last_outifp) 449 in6p->in6p_last_outifp = outif; 450 } else { 451 ROUTE_RELEASE(&in6p->in6p_route); 452 } 453 454 /* 455 * If output interface was cellular, and this socket is 456 * denied access to it, generate an event. 457 */ 458 if (error != 0 && (ip6oa.ip6oa_retflags & IP6OARF_IFDENIED) && 459 (in6p->inp_flags & INP_NO_IFT_CELLULAR)) 460 soevent(in6p->inp_socket, (SO_FILT_HINT_LOCKED| 461 SO_FILT_HINT_IFDENIED)); 462 break; 463 case AF_INET: 464 error = EAFNOSUPPORT; 465 goto release; 466 } 467 goto releaseopt; 468 469release: 470 if (m != NULL) 471 m_freem(m); 472 473releaseopt: 474 if (control != NULL) { 475 if (optp == &opt) 476 ip6_clearpktopts(optp, -1); 477 m_freem(control); 478 } 479 return (error); 480} 481