2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * Copyright (c) 2010-2011 Juniper Networks, Inc.
4 * Copyright (c) 2014 Kevin Lo
7 * Portions of this software were developed by Robert N. M. Watson under
8 * contract to Juniper Networks, Inc.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the project nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
35 * $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
39 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
40 * The Regents of the University of California.
41 * All rights reserved.
43 * Redistribution and use in source and binary forms, with or without
44 * modification, are permitted provided that the following conditions
46 * 1. Redistributions of source code must retain the above copyright
47 * notice, this list of conditions and the following disclaimer.
48 * 2. Redistributions in binary form must reproduce the above copyright
49 * notice, this list of conditions and the following disclaimer in the
50 * documentation and/or other materials provided with the distribution.
51 * 4. Neither the name of the University nor the names of its contributors
52 * may be used to endorse or promote products derived from this software
53 * without specific prior written permission.
55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
67 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
70 #include <sys/cdefs.h>
71 __FBSDID("$FreeBSD$");
74 #include "opt_inet6.h"
76 #include "opt_ipsec.h"
77 #include "opt_kdtrace.h"
79 #include <sys/param.h>
81 #include <sys/kernel.h>
86 #include <sys/protosw.h>
88 #include <sys/signalvar.h>
89 #include <sys/socket.h>
90 #include <sys/socketvar.h>
92 #include <sys/sysctl.h>
93 #include <sys/syslog.h>
94 #include <sys/systm.h>
97 #include <net/if_types.h>
98 #include <net/route.h>
100 #include <netinet/in.h>
101 #include <netinet/in_kdtrace.h>
102 #include <netinet/in_pcb.h>
103 #include <netinet/in_systm.h>
104 #include <netinet/in_var.h>
105 #include <netinet/ip.h>
106 #include <netinet/ip_icmp.h>
107 #include <netinet/ip6.h>
108 #include <netinet/icmp_var.h>
109 #include <netinet/icmp6.h>
110 #include <netinet/ip_var.h>
111 #include <netinet/udp.h>
112 #include <netinet/udp_var.h>
113 #include <netinet/udplite.h>
115 #include <netinet6/ip6protosw.h>
116 #include <netinet6/ip6_var.h>
117 #include <netinet6/in6_pcb.h>
118 #include <netinet6/udp6_var.h>
119 #include <netinet6/scope6_var.h>
122 #include <netipsec/ipsec.h>
123 #include <netipsec/ipsec6.h>
126 #include <security/mac/mac_framework.h>
129 * UDP protocol implementation.
130 * Per RFC 768, August, 1980.
133 extern struct protosw inetsw[];
134 static void udp6_detach(struct socket *so);
137 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
138 struct sockaddr_in6 *fromsa)
144 INP_LOCK_ASSERT(inp);
147 * Engage the tunneling protocol.
150 if (up->u_tun_func != NULL) {
151 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)fromsa,
156 /* Check AH/ESP integrity. */
157 if (ipsec6_in_reject(n, inp)) {
159 IPSEC6STAT_INC(ips_in_polvio);
164 if (mac_inpcb_check_deliver(inp, n) != 0) {
170 if (inp->inp_flags & INP_CONTROLOPTS ||
171 inp->inp_socket->so_options & SO_TIMESTAMP)
172 ip6_savecontrol(inp, n, &opts);
173 m_adj(n, off + sizeof(struct udphdr));
175 so = inp->inp_socket;
176 SOCKBUF_LOCK(&so->so_rcv);
177 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
179 SOCKBUF_UNLOCK(&so->so_rcv);
183 UDPSTAT_INC(udps_fullsock);
185 sorwakeup_locked(so);
189 udp6_input(struct mbuf **mp, int *offp, int proto)
191 struct mbuf *m = *mp;
196 struct inpcbinfo *pcbinfo;
201 struct sockaddr_in6 fromsa;
202 struct m_tag *fwd_tag;
206 ifp = m->m_pkthdr.rcvif;
207 ip6 = mtod(m, struct ip6_hdr *);
209 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
210 /* XXX send icmp6 host/port unreach? */
212 return (IPPROTO_DONE);
215 #ifndef PULLDOWN_TEST
216 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
217 ip6 = mtod(m, struct ip6_hdr *);
218 uh = (struct udphdr *)((caddr_t)ip6 + off);
220 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
222 return (IPPROTO_DONE);
225 UDPSTAT_INC(udps_ipackets);
228 * Destination port of 0 is illegal, based on RFC768.
230 if (uh->uh_dport == 0)
233 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
234 ulen = ntohs((u_short)uh->uh_ulen);
237 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
238 if (nxt == IPPROTO_UDPLITE) {
239 /* Zero means checksum over the complete packet. */
244 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
245 /* XXX: What is the right UDPLite MIB counter? */
248 if (uh->uh_sum == 0) {
249 /* XXX: What is the right UDPLite MIB counter? */
253 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
254 UDPSTAT_INC(udps_badlen);
257 if (uh->uh_sum == 0) {
258 UDPSTAT_INC(udps_nosum);
263 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
265 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
266 uh_sum = m->m_pkthdr.csum_data;
268 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
269 m->m_pkthdr.csum_data);
272 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
275 UDPSTAT_INC(udps_badsum);
280 * Construct sockaddr format source address.
282 init_sin6(&fromsa, m);
283 fromsa.sin6_port = uh->uh_sport;
285 pcbinfo = get_inpcbinfo(nxt);
286 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
288 struct inpcbhead *pcblist;
289 struct ip6_moptions *imo;
291 INP_INFO_RLOCK(pcbinfo);
293 * In the event that laddr should be set to the link-local
294 * address (this happens in RIPng), the multicast address
295 * specified in the received packet will not match laddr. To
296 * handle this situation, matching is relaxed if the
297 * receiving interface is the same as one specified in the
298 * socket and if the destination multicast address matches
299 * one of the multicast groups specified in the socket.
303 * KAME note: traditionally we dropped udpiphdr from mbuf
304 * here. We need udphdr for IPsec processing so we do that
307 pcblist = get_pcblist(nxt);
309 LIST_FOREACH(inp, pcblist, inp_list) {
310 if ((inp->inp_vflag & INP_IPV6) == 0)
312 if (inp->inp_lport != uh->uh_dport)
314 if (inp->inp_fport != 0 &&
315 inp->inp_fport != uh->uh_sport)
317 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
318 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
322 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
323 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
325 inp->inp_fport != uh->uh_sport)
330 * XXXRW: Because we weren't holding either the inpcb
331 * or the hash lock when we checked for a match
332 * before, we should probably recheck now that the
333 * inpcb lock is (supposed to be) held.
337 * Handle socket delivery policy for any-source
338 * and source-specific multicast. [RFC3678]
340 imo = inp->in6p_moptions;
341 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
342 struct sockaddr_in6 mcaddr;
347 bzero(&mcaddr, sizeof(struct sockaddr_in6));
348 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
349 mcaddr.sin6_family = AF_INET6;
350 mcaddr.sin6_addr = ip6->ip6_dst;
352 blocked = im6o_mc_filter(imo, ifp,
353 (struct sockaddr *)&mcaddr,
354 (struct sockaddr *)&fromsa);
355 if (blocked != MCAST_PASS) {
356 if (blocked == MCAST_NOTGMEMBER)
357 IP6STAT_INC(ip6s_notmember);
358 if (blocked == MCAST_NOTSMEMBER ||
359 blocked == MCAST_MUTED)
360 UDPSTAT_INC(udps_filtermcast);
361 INP_RUNLOCK(inp); /* XXX */
370 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
372 UDP_PROBE(receive, NULL, last, ip6,
374 udp6_append(last, n, off, &fromsa);
380 * Don't look for additional matches if this one does
381 * not have either the SO_REUSEPORT or SO_REUSEADDR
382 * socket options set. This heuristic avoids
383 * searching through all pcbs in the common case of a
384 * non-shared port. It assumes that an application
385 * will never clear these options after setting them.
387 if ((last->inp_socket->so_options &
388 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
394 * No matching pcb found; discard datagram. (No need
395 * to send an ICMP Port Unreachable for a broadcast
396 * or multicast datgram.)
398 UDPSTAT_INC(udps_noport);
399 UDPSTAT_INC(udps_noportmcast);
403 INP_INFO_RUNLOCK(pcbinfo);
404 UDP_PROBE(receive, NULL, last, ip6, last, uh);
405 udp6_append(last, m, off, &fromsa);
407 return (IPPROTO_DONE);
410 * Locate pcb for datagram.
414 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
416 if ((m->m_flags & M_IP6_NEXTHOP) &&
417 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
418 struct sockaddr_in6 *next_hop6;
420 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
423 * Transparently forwarded. Pretend to be the destination.
424 * Already got one like this?
426 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
427 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
428 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
431 * It's new. Try to find the ambushing socket.
432 * Because we've rewritten the destination address,
433 * any hardware-generated hash is ignored.
435 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
436 uh->uh_sport, &next_hop6->sin6_addr,
437 next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
438 uh->uh_dport, INPLOOKUP_WILDCARD |
439 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
441 /* Remove the tag from the packet. We don't need it anymore. */
442 m_tag_delete(m, fwd_tag);
443 m->m_flags &= ~M_IP6_NEXTHOP;
445 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
446 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
447 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
448 m->m_pkthdr.rcvif, m);
450 if (udp_log_in_vain) {
451 char ip6bufs[INET6_ADDRSTRLEN];
452 char ip6bufd[INET6_ADDRSTRLEN];
455 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
456 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
458 ip6_sprintf(ip6bufs, &ip6->ip6_src),
459 ntohs(uh->uh_sport));
461 UDPSTAT_INC(udps_noport);
462 if (m->m_flags & M_MCAST) {
463 printf("UDP6: M_MCAST is set in a unicast packet.\n");
464 UDPSTAT_INC(udps_noportmcast);
469 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0)
471 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
472 return (IPPROTO_DONE);
474 INP_RLOCK_ASSERT(inp);
477 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
480 return (IPPROTO_DONE);
483 UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
484 udp6_append(inp, m, off, &fromsa);
486 return (IPPROTO_DONE);
489 INP_INFO_RUNLOCK(pcbinfo);
493 return (IPPROTO_DONE);
497 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d,
498 struct inpcbinfo *pcbinfo)
504 struct ip6ctlparam *ip6cp = NULL;
505 const struct sockaddr_in6 *sa6_src = NULL;
507 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
508 struct udp_portonly {
513 if (sa->sa_family != AF_INET6 ||
514 sa->sa_len != sizeof(struct sockaddr_in6))
517 if ((unsigned)cmd >= PRC_NCMDS)
519 if (PRC_IS_REDIRECT(cmd))
520 notify = in6_rtchange, d = NULL;
521 else if (cmd == PRC_HOSTDEAD)
523 else if (inet6ctlerrmap[cmd] == 0)
526 /* if the parameter is from icmp6, decode it. */
528 ip6cp = (struct ip6ctlparam *)d;
530 ip6 = ip6cp->ip6c_ip6;
531 off = ip6cp->ip6c_off;
532 cmdarg = ip6cp->ip6c_cmdarg;
533 sa6_src = ip6cp->ip6c_src;
543 * XXX: We assume that when IPV6 is non NULL,
544 * M and OFF are valid.
547 /* Check if we can safely examine src and dst ports. */
548 if (m->m_pkthdr.len < off + sizeof(*uhp))
551 bzero(&uh, sizeof(uh));
552 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
554 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport,
555 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
558 (void)in6_pcbnotify(pcbinfo, sa, 0,
559 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
563 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
566 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo));
570 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d)
573 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo));
577 udp6_getcred(SYSCTL_HANDLER_ARGS)
580 struct sockaddr_in6 addrs[2];
584 error = priv_check(req->td, PRIV_NETINET_GETCRED);
588 if (req->newlen != sizeof(addrs))
590 if (req->oldlen != sizeof(struct xucred))
592 error = SYSCTL_IN(req, addrs, sizeof(addrs));
595 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
596 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
599 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
600 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
601 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
603 INP_RLOCK_ASSERT(inp);
604 if (inp->inp_socket == NULL)
607 error = cr_canseesocket(req->td->td_ucred,
610 cru2x(inp->inp_cred, &xuc);
615 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
619 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
620 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
623 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
624 struct mbuf *control, struct thread *td)
626 u_int32_t ulen = m->m_pkthdr.len;
627 u_int32_t plen = sizeof(struct udphdr) + ulen;
630 struct in6_addr *laddr, *faddr, in6a;
631 struct sockaddr_in6 *sin6 = NULL;
632 struct ifnet *oifp = NULL;
633 int cscov_partial = 0;
634 int scope_ambiguous = 0;
639 struct ip6_pktopts *optp, opt;
640 int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
642 struct sockaddr_in6 tmp;
644 INP_WLOCK_ASSERT(inp);
645 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
648 /* addr6 has been validated in udp6_send(). */
649 sin6 = (struct sockaddr_in6 *)addr6;
651 /* protect *sin6 from overwrites */
656 * Application should provide a proper zone ID or the use of
657 * default zone IDs should be enabled. Unfortunately, some
658 * applications do not behave as it should, so we need a
659 * workaround. Even if an appropriate ID is not determined,
660 * we'll see if we can determine the outgoing interface. If we
661 * can, determine the zone ID based on the interface below.
663 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
665 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
670 if ((error = ip6_setpktopts(control, &opt,
671 inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0)
675 optp = inp->in6p_outputopts;
678 faddr = &sin6->sin6_addr;
681 * Since we saw no essential reason for calling in_pcbconnect,
682 * we get rid of such kind of logic, and call in6_selectsrc
683 * and in6_pcbsetport in order to fill in the local address
684 * and the local port.
686 if (sin6->sin6_port == 0) {
687 error = EADDRNOTAVAIL;
691 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
692 /* how about ::ffff:0.0.0.0 case? */
697 fport = sin6->sin6_port; /* allow 0 port */
699 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
700 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
702 * I believe we should explicitly discard the
703 * packet when mapped addresses are disabled,
704 * rather than send the packet as an IPv6 one.
705 * If we chose the latter approach, the packet
706 * might be sent out on the wire based on the
707 * default route, the situation which we'd
708 * probably want to avoid.
709 * (20010421 jinmei@kame.net)
714 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
715 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
717 * when remote addr is an IPv4-mapped address,
718 * local addr should not be an IPv6 address,
719 * since you cannot determine how to map IPv6
720 * source address to IPv4.
729 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
730 error = in6_selectsrc(sin6, optp, inp, NULL,
731 td->td_ucred, &oifp, &in6a);
734 if (oifp && scope_ambiguous &&
735 (error = in6_setscope(&sin6->sin6_addr,
741 laddr = &inp->in6p_laddr; /* XXX */
744 error = EADDRNOTAVAIL;
747 if (inp->inp_lport == 0 &&
748 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) {
749 /* Undo an address bind that may have occurred. */
750 inp->in6p_laddr = in6addr_any;
754 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
758 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
759 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
761 * XXX: this case would happen when the
762 * application sets the V6ONLY flag after
763 * connecting the foreign address.
764 * Such applications should be fixed,
767 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
768 "option was set for a connected socket\n");
774 laddr = &inp->in6p_laddr;
775 faddr = &inp->in6p_faddr;
776 fport = inp->inp_fport;
780 hlen = sizeof(struct ip);
783 * Calculate data length and get a mbuf
784 * for UDP and IP6 headers.
786 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
793 * Stuff checksum and output datagram.
795 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
796 IPPROTO_UDP : IPPROTO_UDPLITE;
797 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
798 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
799 udp6->uh_dport = fport;
800 if (nxt == IPPROTO_UDPLITE) {
804 cscov = up->u_txcslen;
807 udp6->uh_ulen = htons(cscov);
809 * For UDP-Lite, checksum coverage length of zero means
810 * the entire UDPLite packet is covered by the checksum.
812 cscov_partial = (cscov == 0) ? 0 : 1;
813 } else if (plen <= 0xffff)
814 udp6->uh_ulen = htons((u_short)plen);
821 ip6 = mtod(m, struct ip6_hdr *);
822 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK;
823 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
824 ip6->ip6_vfc |= IPV6_VERSION;
825 ip6->ip6_plen = htons((u_short)plen);
827 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
828 ip6->ip6_src = *laddr;
829 ip6->ip6_dst = *faddr;
832 if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
833 sizeof(struct ip6_hdr), plen, cscov)) == 0)
834 udp6->uh_sum = 0xffff;
836 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
837 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
838 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
843 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
844 UDPSTAT_INC(udps_opackets);
845 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions,
849 error = EAFNOSUPPORT;
859 ip6_clearpktopts(&opt, -1);
866 udp6_abort(struct socket *so)
869 struct inpcbinfo *pcbinfo;
871 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
873 KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
876 if (inp->inp_vflag & INP_IPV4) {
877 struct pr_usrreqs *pru;
879 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
880 (*pru->pru_abort)(so);
886 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
887 INP_HASH_WLOCK(pcbinfo);
888 in6_pcbdisconnect(inp);
889 inp->in6p_laddr = in6addr_any;
890 INP_HASH_WUNLOCK(pcbinfo);
891 soisdisconnected(so);
897 udp6_attach(struct socket *so, int proto, struct thread *td)
900 struct inpcbinfo *pcbinfo;
903 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
905 KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
907 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
908 error = soreserve(so, udp_sendspace, udp_recvspace);
912 INP_INFO_WLOCK(pcbinfo);
913 error = in_pcballoc(so, pcbinfo);
915 INP_INFO_WUNLOCK(pcbinfo);
918 inp = (struct inpcb *)so->so_pcb;
919 inp->inp_vflag |= INP_IPV6;
920 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
921 inp->inp_vflag |= INP_IPV4;
922 inp->in6p_hops = -1; /* use kernel default */
923 inp->in6p_cksum = -1; /* just to be sure */
926 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
927 * because the socket may be bound to an IPv6 wildcard address,
928 * which may match an IPv4-mapped IPv6 address.
930 inp->inp_ip_ttl = V_ip_defttl;
932 error = udp_newudpcb(inp);
936 INP_INFO_WUNLOCK(pcbinfo);
940 INP_INFO_WUNLOCK(pcbinfo);
945 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
948 struct inpcbinfo *pcbinfo;
951 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
953 KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
956 INP_HASH_WLOCK(pcbinfo);
957 inp->inp_vflag &= ~INP_IPV4;
958 inp->inp_vflag |= INP_IPV6;
959 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
960 struct sockaddr_in6 *sin6_p;
962 sin6_p = (struct sockaddr_in6 *)nam;
964 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
965 inp->inp_vflag |= INP_IPV4;
967 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
968 struct sockaddr_in sin;
970 in6_sin6_2_sin(&sin, sin6_p);
971 inp->inp_vflag |= INP_IPV4;
972 inp->inp_vflag &= ~INP_IPV6;
973 error = in_pcbbind(inp, (struct sockaddr *)&sin,
980 error = in6_pcbbind(inp, nam, td->td_ucred);
984 INP_HASH_WUNLOCK(pcbinfo);
990 udp6_close(struct socket *so)
993 struct inpcbinfo *pcbinfo;
995 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
997 KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
1000 if (inp->inp_vflag & INP_IPV4) {
1001 struct pr_usrreqs *pru;
1003 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
1004 (*pru->pru_disconnect)(so);
1009 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1010 INP_HASH_WLOCK(pcbinfo);
1011 in6_pcbdisconnect(inp);
1012 inp->in6p_laddr = in6addr_any;
1013 INP_HASH_WUNLOCK(pcbinfo);
1014 soisdisconnected(so);
1020 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1023 struct inpcbinfo *pcbinfo;
1024 struct sockaddr_in6 *sin6;
1027 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1028 inp = sotoinpcb(so);
1029 sin6 = (struct sockaddr_in6 *)nam;
1030 KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
1033 * XXXRW: Need to clarify locking of v4/v6 flags.
1037 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1038 struct sockaddr_in sin;
1040 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1044 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1048 in6_sin6_2_sin(&sin, sin6);
1049 inp->inp_vflag |= INP_IPV4;
1050 inp->inp_vflag &= ~INP_IPV6;
1051 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
1054 INP_HASH_WLOCK(pcbinfo);
1055 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
1057 INP_HASH_WUNLOCK(pcbinfo);
1063 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1067 inp->inp_vflag &= ~INP_IPV4;
1068 inp->inp_vflag |= INP_IPV6;
1069 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1072 INP_HASH_WLOCK(pcbinfo);
1073 error = in6_pcbconnect(inp, nam, td->td_ucred);
1074 INP_HASH_WUNLOCK(pcbinfo);
1083 udp6_detach(struct socket *so)
1086 struct inpcbinfo *pcbinfo;
1089 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1090 inp = sotoinpcb(so);
1091 KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1093 INP_INFO_WLOCK(pcbinfo);
1095 up = intoudpcb(inp);
1096 KASSERT(up != NULL, ("%s: up == NULL", __func__));
1099 INP_INFO_WUNLOCK(pcbinfo);
1104 udp6_disconnect(struct socket *so)
1107 struct inpcbinfo *pcbinfo;
1110 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1111 inp = sotoinpcb(so);
1112 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1115 if (inp->inp_vflag & INP_IPV4) {
1116 struct pr_usrreqs *pru;
1118 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
1119 (void)(*pru->pru_disconnect)(so);
1126 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1131 INP_HASH_WLOCK(pcbinfo);
1132 in6_pcbdisconnect(inp);
1133 inp->in6p_laddr = in6addr_any;
1134 INP_HASH_WUNLOCK(pcbinfo);
1136 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1144 udp6_send(struct socket *so, int flags, struct mbuf *m,
1145 struct sockaddr *addr, struct mbuf *control, struct thread *td)
1148 struct inpcbinfo *pcbinfo;
1151 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1152 inp = sotoinpcb(so);
1153 KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
1157 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1161 if (addr->sa_family != AF_INET6) {
1162 error = EAFNOSUPPORT;
1168 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1170 struct sockaddr_in6 *sin6 = 0;
1173 hasv4addr = (inp->inp_vflag & INP_IPV4);
1175 sin6 = (struct sockaddr_in6 *)addr;
1176 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
1180 struct pr_usrreqs *pru;
1183 * XXXRW: We release UDP-layer locks before calling
1184 * udp_send() in order to avoid recursion. However,
1185 * this does mean there is a short window where inp's
1186 * fields are unstable. Could this lead to a
1187 * potential race in which the factors causing us to
1188 * select the UDPv4 output routine are invalidated?
1192 in6_sin6_2_sin_in_sock(addr);
1193 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
1194 /* addr will just be freed in sendit(). */
1195 return ((*pru->pru_send)(so, flags, m, addr, control,
1201 mac_inpcb_create_mbuf(inp, m);
1203 INP_HASH_WLOCK(pcbinfo);
1204 error = udp6_output(inp, m, addr, control, td);
1205 INP_HASH_WUNLOCK(pcbinfo);
1217 struct pr_usrreqs udp6_usrreqs = {
1218 .pru_abort = udp6_abort,
1219 .pru_attach = udp6_attach,
1220 .pru_bind = udp6_bind,
1221 .pru_connect = udp6_connect,
1222 .pru_control = in6_control,
1223 .pru_detach = udp6_detach,
1224 .pru_disconnect = udp6_disconnect,
1225 .pru_peeraddr = in6_mapped_peeraddr,
1226 .pru_send = udp6_send,
1227 .pru_shutdown = udp_shutdown,
1228 .pru_sockaddr = in6_mapped_sockaddr,
1229 .pru_soreceive = soreceive_dgram,
1230 .pru_sosend = sosend_dgram,
1231 .pru_sosetlabel = in_pcbsosetlabel,
1232 .pru_close = udp6_close