1/* 2 * Copyright (c) 2000-2012 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#ifdef IPSEC 133#include <netinet6/ipsec.h> 134#ifdef INET6 135#include <netinet6/ipsec6.h> 136#endif 137extern int ipsec_bypass; 138#endif /*IPSEC*/ 139 140#include <net/net_osdep.h> 141 142/* 143 * UDP protocol inplementation. 144 * Per RFC 768, August, 1980. 145 */ 146 147#define in6pcb inpcb 148#define udp6stat udpstat 149#define udp6s_opackets udps_opackets 150 151static __inline__ u_int16_t 152get_socket_id(struct socket * s) 153{ 154 u_int16_t val; 155 156 if (s == NULL) { 157 return (0); 158 } 159 val = (u_int16_t)(((uintptr_t)s) / sizeof(struct socket)); 160 if (val == 0) { 161 val = 0xffff; 162 } 163 return (val); 164} 165 166int 167udp6_output(in6p, m, addr6, control, p) 168 struct in6pcb *in6p; 169 struct mbuf *m; 170 struct mbuf *control; 171 struct sockaddr *addr6; 172 struct proc *p; 173{ 174 u_int32_t ulen = m->m_pkthdr.len; 175 u_int32_t plen = sizeof(struct udphdr) + ulen; 176 struct ip6_hdr *ip6; 177 struct udphdr *udp6; 178 struct in6_addr *laddr, *faddr; 179 u_short fport; 180 int error = 0; 181 struct ip6_pktopts opt, *optp = NULL; 182 struct ip6_moptions *im6o; 183 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 184 int flags; 185 struct sockaddr_in6 tmp; 186 struct in6_addr storage; 187 mbuf_svc_class_t msc = MBUF_SC_UNSPEC; 188 struct ip6_out_args ip6oa = 189 { IFSCOPE_NONE, { 0 }, IP6OAF_SELECT_SRCIF }; 190 struct flowadv *adv = &ip6oa.ip6oa_flowadv; 191 int flowadv = 0; 192 193 /* Enable flow advisory only when connected */ 194 flowadv = (in6p->inp_socket->so_state & SS_ISCONNECTED) ? 1 : 0; 195 196 if (flowadv && INP_WAIT_FOR_IF_FEEDBACK(in6p)) { 197 error = ENOBUFS; 198 goto release; 199 } 200 201 if (in6p->inp_flags & INP_BOUND_IF) { 202 ip6oa.ip6oa_boundif = in6p->inp_boundifp->if_index; 203 ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF; 204 } 205 if (in6p->inp_flags & INP_NO_IFT_CELLULAR) 206 ip6oa.ip6oa_flags |= IP6OAF_NO_CELLULAR; 207 208 if (control) { 209 msc = mbuf_service_class_from_control(control); 210 211 if ((error = ip6_setpktopts(control, &opt, NULL, IPPROTO_UDP)) != 0) 212 goto release; 213 optp = &opt; 214 } else 215 optp = in6p->in6p_outputopts; 216 217 if (addr6) { 218 /* 219 * IPv4 version of udp_output calls in_pcbconnect in this case, 220 * which needs splnet and affects performance. 221 * Since we saw no essential reason for calling in_pcbconnect, 222 * we get rid of such kind of logic, and call in6_selectsrc 223 * and in6_pcbsetport in order to fill in the local address 224 * and the local port. 225 */ 226 struct sockaddr_in6 *sin6 = 227 (struct sockaddr_in6 *)(void *)addr6; 228 229 if (sin6->sin6_port == 0) { 230 error = EADDRNOTAVAIL; 231 goto release; 232 } 233 234 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 235 /* how about ::ffff:0.0.0.0 case? */ 236 error = EISCONN; 237 goto release; 238 } 239 240 /* protect *sin6 from overwrites */ 241 tmp = *sin6; 242 sin6 = &tmp; 243 244 faddr = &sin6->sin6_addr; 245 fport = sin6->sin6_port; /* allow 0 port */ 246 247 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 248 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) { 249 /* 250 * I believe we should explicitly discard the 251 * packet when mapped addresses are disabled, 252 * rather than send the packet as an IPv6 one. 253 * If we chose the latter approach, the packet 254 * might be sent out on the wire based on the 255 * default route, the situation which we'd 256 * probably want to avoid. 257 * (20010421 jinmei@kame.net) 258 */ 259 error = EINVAL; 260 goto release; 261 } else 262 af = AF_INET; 263 } 264 265 /* KAME hack: embed scopeid */ 266 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL, 267 optp) != 0) { 268 error = EINVAL; 269 goto release; 270 } 271 272 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 273 laddr = in6_selectsrc(sin6, optp, 274 in6p, &in6p->in6p_route, NULL, &storage, 275 ip6oa.ip6oa_boundif, &error); 276 } else 277 laddr = &in6p->in6p_laddr; /* XXX */ 278 if (laddr == NULL) { 279 if (error == 0) 280 error = EADDRNOTAVAIL; 281 goto release; 282 } 283 if (in6p->in6p_lport == 0 && 284 (error = in6_pcbsetport(laddr, in6p, p, 0)) != 0) 285 goto release; 286 } else { 287 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 288 error = ENOTCONN; 289 goto release; 290 } 291 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) { 292 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) { 293 /* 294 * XXX: this case would happen when the 295 * application sets the V6ONLY flag after 296 * connecting the foreign address. 297 * Such applications should be fixed, 298 * so we bark here. 299 */ 300 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 301 "option was set for a connected socket\n"); 302 error = EINVAL; 303 goto release; 304 } else 305 af = AF_INET; 306 } 307 laddr = &in6p->in6p_laddr; 308 faddr = &in6p->in6p_faddr; 309 fport = in6p->in6p_fport; 310 } 311 312 if (in6p->inp_flowhash == 0) 313 in6p->inp_flowhash = inp_calc_flowhash(in6p); 314 315 if (af == AF_INET) 316 hlen = sizeof(struct ip); 317 318 /* 319 * Calculate data length and get a mbuf 320 * for UDP and IP6 headers. 321 */ 322 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT); 323 if (m == 0) { 324 error = ENOBUFS; 325 goto release; 326 } 327 328 /* 329 * Stuff checksum and output datagram. 330 */ 331 udp6 = (struct udphdr *)(void *)(mtod(m, caddr_t) + hlen); 332 udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */ 333 udp6->uh_dport = fport; 334 if (plen <= 0xffff) 335 udp6->uh_ulen = htons((u_short)plen); 336 else 337 udp6->uh_ulen = 0; 338 udp6->uh_sum = 0; 339 340 switch (af) { 341 case AF_INET6: 342 ip6 = mtod(m, struct ip6_hdr *); 343 ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK; 344 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 345 ip6->ip6_vfc |= IPV6_VERSION; 346#if 0 /* ip6_plen will be filled in ip6_output. */ 347 ip6->ip6_plen = htons((u_short)plen); 348#endif 349 ip6->ip6_nxt = IPPROTO_UDP; 350 ip6->ip6_hlim = in6_selecthlim(in6p, 351 in6p->in6p_route.ro_rt ? 352 in6p->in6p_route.ro_rt->rt_ifp : NULL); 353 ip6->ip6_src = *laddr; 354 ip6->ip6_dst = *faddr; 355 356 udp6->uh_sum = in6_cksum_phdr(laddr, faddr, 357 htonl(plen), htonl(IPPROTO_UDP)); 358 m->m_pkthdr.csum_flags = CSUM_UDPIPV6; 359 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 360 361 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 362 ip6oa.ip6oa_flags |= IP6OAF_BOUND_SRCADDR; 363 364 flags = IPV6_OUTARGS; 365 366 udp6stat.udp6s_opackets++; 367#ifdef IPSEC 368 if (ipsec_bypass == 0 && ipsec_setsocket(m, in6p->in6p_socket) != 0) { 369 error = ENOBUFS; 370 goto release; 371 } 372#endif /*IPSEC*/ 373 m->m_pkthdr.socket_id = get_socket_id(in6p->in6p_socket); 374 375 set_packet_service_class(m, in6p->in6p_socket, msc, PKT_SCF_IPV6); 376 377 m->m_pkthdr.m_flowhash = in6p->inp_flowhash; 378 m->m_pkthdr.m_fhflags |= PF_TAG_FLOWHASH; 379 if (flowadv) 380 m->m_pkthdr.m_fhflags |= PF_TAG_FLOWADV; 381 382 im6o = in6p->in6p_moptions; 383 if (im6o != NULL) { 384 IM6O_LOCK(im6o); 385 IM6O_ADDREF_LOCKED(im6o); 386 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 387 im6o->im6o_multicast_ifp != NULL) { 388 in6p->in6p_last_outifp = im6o->im6o_multicast_ifp; 389 } 390 IM6O_UNLOCK(im6o); 391 } 392 393 in6p->inp_sndinprog_cnt++; 394 395 error = ip6_output(m, optp, &in6p->in6p_route, 396 flags, im6o, NULL, &ip6oa); 397 398 if (im6o != NULL) 399 IM6O_REMREF(im6o); 400 401 if (error == 0 && nstat_collect) { 402 locked_add_64(&in6p->inp_stat->txpackets, 1); 403 locked_add_64(&in6p->inp_stat->txbytes, ulen); 404 } 405 406 if (flowadv && (adv->code == FADV_FLOW_CONTROLLED || 407 adv->code == FADV_SUSPENDED)) { 408 /* return an error to indicate 409 * that the packet has been dropped 410 */ 411 error = ENOBUFS; 412 inp_set_fc_state(in6p, adv->code); 413 } 414 415 VERIFY(in6p->inp_sndinprog_cnt > 0); 416 if ( --in6p->inp_sndinprog_cnt == 0) 417 in6p->inp_flags &= ~(INP_FC_FEEDBACK); 418 419 if (in6p->in6p_route.ro_rt != NULL) { 420 struct rtentry *rt = in6p->in6p_route.ro_rt; 421 struct ifnet *outif; 422 423 if ((rt->rt_flags & RTF_MULTICAST) || 424 in6p->in6p_socket == NULL || 425 !(in6p->in6p_socket->so_state & SS_ISCONNECTED)) { 426 rt = NULL; /* unusable */ 427 } 428 /* 429 * Always discard the cached route for unconnected 430 * socket or if it is a multicast route. 431 */ 432 if (rt == NULL) { 433 rtfree(in6p->in6p_route.ro_rt); 434 in6p->in6p_route.ro_rt = NULL; 435 } 436 /* 437 * If this is a connected socket and the destination 438 * route is not multicast, update outif with that of 439 * the route interface used by IP. 440 */ 441 if (rt != NULL && 442 (outif = rt->rt_ifp) != in6p->in6p_last_outifp) 443 in6p->in6p_last_outifp = outif; 444 } 445 break; 446 case AF_INET: 447 error = EAFNOSUPPORT; 448 goto release; 449 } 450 goto releaseopt; 451 452release: 453 m_freem(m); 454 455releaseopt: 456 if (control) { 457 if (optp == &opt) 458 ip6_clearpktopts(optp, -1); 459 m_freem(control); 460 } 461 return(error); 462} 463