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"
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_var.h>
98 #include <net/if_types.h>
99 #include <net/route.h>
101 #include <netinet/in.h>
102 #include <netinet/in_kdtrace.h>
103 #include <netinet/in_pcb.h>
104 #include <netinet/in_systm.h>
105 #include <netinet/in_var.h>
106 #include <netinet/ip.h>
107 #include <netinet/ip_icmp.h>
108 #include <netinet/ip6.h>
109 #include <netinet/icmp_var.h>
110 #include <netinet/icmp6.h>
111 #include <netinet/ip_var.h>
112 #include <netinet/udp.h>
113 #include <netinet/udp_var.h>
114 #include <netinet/udplite.h>
115 #include <netinet/in_rss.h>
117 #include <netinet6/ip6protosw.h>
118 #include <netinet6/ip6_var.h>
119 #include <netinet6/in6_pcb.h>
120 #include <netinet6/udp6_var.h>
121 #include <netinet6/scope6_var.h>
124 #include <netipsec/ipsec.h>
125 #include <netipsec/ipsec6.h>
128 #include <security/mac/mac_framework.h>
131 * UDP protocol implementation.
132 * Per RFC 768, August, 1980.
135 extern struct protosw inetsw[];
136 static void udp6_detach(struct socket *so);
139 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
140 struct sockaddr_in6 *fromsa)
146 INP_LOCK_ASSERT(inp);
149 * Engage the tunneling protocol.
152 if (up->u_tun_func != NULL) {
153 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)fromsa,
158 /* Check AH/ESP integrity. */
159 if (ipsec6_in_reject(n, inp)) {
165 if (mac_inpcb_check_deliver(inp, n) != 0) {
171 if (inp->inp_flags & INP_CONTROLOPTS ||
172 inp->inp_socket->so_options & SO_TIMESTAMP)
173 ip6_savecontrol(inp, n, &opts);
174 m_adj(n, off + sizeof(struct udphdr));
176 so = inp->inp_socket;
177 SOCKBUF_LOCK(&so->so_rcv);
178 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
180 SOCKBUF_UNLOCK(&so->so_rcv);
184 UDPSTAT_INC(udps_fullsock);
186 sorwakeup_locked(so);
190 udp6_input(struct mbuf **mp, int *offp, int proto)
192 struct mbuf *m = *mp;
197 struct inpcbinfo *pcbinfo;
202 struct sockaddr_in6 fromsa;
203 struct m_tag *fwd_tag;
207 ifp = m->m_pkthdr.rcvif;
208 ip6 = mtod(m, struct ip6_hdr *);
210 #ifndef PULLDOWN_TEST
211 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
212 ip6 = mtod(m, struct ip6_hdr *);
213 uh = (struct udphdr *)((caddr_t)ip6 + off);
215 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
217 return (IPPROTO_DONE);
220 UDPSTAT_INC(udps_ipackets);
223 * Destination port of 0 is illegal, based on RFC768.
225 if (uh->uh_dport == 0)
228 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
229 ulen = ntohs((u_short)uh->uh_ulen);
232 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
233 if (nxt == IPPROTO_UDPLITE) {
234 /* Zero means checksum over the complete packet. */
239 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
240 /* XXX: What is the right UDPLite MIB counter? */
243 if (uh->uh_sum == 0) {
244 /* XXX: What is the right UDPLite MIB counter? */
248 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
249 UDPSTAT_INC(udps_badlen);
252 if (uh->uh_sum == 0) {
253 UDPSTAT_INC(udps_nosum);
258 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
260 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
261 uh_sum = m->m_pkthdr.csum_data;
263 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
264 m->m_pkthdr.csum_data);
267 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
270 UDPSTAT_INC(udps_badsum);
275 * Construct sockaddr format source address.
277 init_sin6(&fromsa, m);
278 fromsa.sin6_port = uh->uh_sport;
280 pcbinfo = get_inpcbinfo(nxt);
281 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
283 struct inpcbhead *pcblist;
284 struct ip6_moptions *imo;
286 INP_INFO_RLOCK(pcbinfo);
288 * In the event that laddr should be set to the link-local
289 * address (this happens in RIPng), the multicast address
290 * specified in the received packet will not match laddr. To
291 * handle this situation, matching is relaxed if the
292 * receiving interface is the same as one specified in the
293 * socket and if the destination multicast address matches
294 * one of the multicast groups specified in the socket.
298 * KAME note: traditionally we dropped udpiphdr from mbuf
299 * here. We need udphdr for IPsec processing so we do that
302 pcblist = get_pcblist(nxt);
304 LIST_FOREACH(inp, pcblist, inp_list) {
305 if ((inp->inp_vflag & INP_IPV6) == 0)
307 if (inp->inp_lport != uh->uh_dport)
309 if (inp->inp_fport != 0 &&
310 inp->inp_fport != uh->uh_sport)
312 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
313 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
317 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
318 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
320 inp->inp_fport != uh->uh_sport)
325 * XXXRW: Because we weren't holding either the inpcb
326 * or the hash lock when we checked for a match
327 * before, we should probably recheck now that the
328 * inpcb lock is (supposed to be) held.
332 * Handle socket delivery policy for any-source
333 * and source-specific multicast. [RFC3678]
335 imo = inp->in6p_moptions;
336 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
337 struct sockaddr_in6 mcaddr;
342 bzero(&mcaddr, sizeof(struct sockaddr_in6));
343 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
344 mcaddr.sin6_family = AF_INET6;
345 mcaddr.sin6_addr = ip6->ip6_dst;
347 blocked = im6o_mc_filter(imo, ifp,
348 (struct sockaddr *)&mcaddr,
349 (struct sockaddr *)&fromsa);
350 if (blocked != MCAST_PASS) {
351 if (blocked == MCAST_NOTGMEMBER)
352 IP6STAT_INC(ip6s_notmember);
353 if (blocked == MCAST_NOTSMEMBER ||
354 blocked == MCAST_MUTED)
355 UDPSTAT_INC(udps_filtermcast);
356 INP_RUNLOCK(inp); /* XXX */
365 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
367 UDP_PROBE(receive, NULL, last, ip6,
369 udp6_append(last, n, off, &fromsa);
375 * Don't look for additional matches if this one does
376 * not have either the SO_REUSEPORT or SO_REUSEADDR
377 * socket options set. This heuristic avoids
378 * searching through all pcbs in the common case of a
379 * non-shared port. It assumes that an application
380 * will never clear these options after setting them.
382 if ((last->inp_socket->so_options &
383 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
389 * No matching pcb found; discard datagram. (No need
390 * to send an ICMP Port Unreachable for a broadcast
391 * or multicast datgram.)
393 UDPSTAT_INC(udps_noport);
394 UDPSTAT_INC(udps_noportmcast);
398 INP_INFO_RUNLOCK(pcbinfo);
399 UDP_PROBE(receive, NULL, last, ip6, last, uh);
400 udp6_append(last, m, off, &fromsa);
402 return (IPPROTO_DONE);
405 * Locate pcb for datagram.
409 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
411 if ((m->m_flags & M_IP6_NEXTHOP) &&
412 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
413 struct sockaddr_in6 *next_hop6;
415 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
418 * Transparently forwarded. Pretend to be the destination.
419 * Already got one like this?
421 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
422 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
423 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
426 * It's new. Try to find the ambushing socket.
427 * Because we've rewritten the destination address,
428 * any hardware-generated hash is ignored.
430 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
431 uh->uh_sport, &next_hop6->sin6_addr,
432 next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
433 uh->uh_dport, INPLOOKUP_WILDCARD |
434 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
436 /* Remove the tag from the packet. We don't need it anymore. */
437 m_tag_delete(m, fwd_tag);
438 m->m_flags &= ~M_IP6_NEXTHOP;
440 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
441 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
442 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
443 m->m_pkthdr.rcvif, m);
445 if (udp_log_in_vain) {
446 char ip6bufs[INET6_ADDRSTRLEN];
447 char ip6bufd[INET6_ADDRSTRLEN];
450 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
451 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
453 ip6_sprintf(ip6bufs, &ip6->ip6_src),
454 ntohs(uh->uh_sport));
456 UDPSTAT_INC(udps_noport);
457 if (m->m_flags & M_MCAST) {
458 printf("UDP6: M_MCAST is set in a unicast packet.\n");
459 UDPSTAT_INC(udps_noportmcast);
464 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0)
466 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
467 return (IPPROTO_DONE);
469 INP_RLOCK_ASSERT(inp);
472 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
475 return (IPPROTO_DONE);
478 UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
479 udp6_append(inp, m, off, &fromsa);
481 return (IPPROTO_DONE);
484 INP_INFO_RUNLOCK(pcbinfo);
488 return (IPPROTO_DONE);
492 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d,
493 struct inpcbinfo *pcbinfo)
499 struct ip6ctlparam *ip6cp = NULL;
500 const struct sockaddr_in6 *sa6_src = NULL;
502 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
503 struct udp_portonly {
508 if (sa->sa_family != AF_INET6 ||
509 sa->sa_len != sizeof(struct sockaddr_in6))
512 if ((unsigned)cmd >= PRC_NCMDS)
514 if (PRC_IS_REDIRECT(cmd))
515 notify = in6_rtchange, d = NULL;
516 else if (cmd == PRC_HOSTDEAD)
518 else if (inet6ctlerrmap[cmd] == 0)
521 /* if the parameter is from icmp6, decode it. */
523 ip6cp = (struct ip6ctlparam *)d;
525 ip6 = ip6cp->ip6c_ip6;
526 off = ip6cp->ip6c_off;
527 cmdarg = ip6cp->ip6c_cmdarg;
528 sa6_src = ip6cp->ip6c_src;
538 * XXX: We assume that when IPV6 is non NULL,
539 * M and OFF are valid.
542 /* Check if we can safely examine src and dst ports. */
543 if (m->m_pkthdr.len < off + sizeof(*uhp))
546 bzero(&uh, sizeof(uh));
547 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
549 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport,
550 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
553 (void)in6_pcbnotify(pcbinfo, sa, 0,
554 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
558 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
561 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo));
565 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d)
568 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo));
572 udp6_getcred(SYSCTL_HANDLER_ARGS)
575 struct sockaddr_in6 addrs[2];
579 error = priv_check(req->td, PRIV_NETINET_GETCRED);
583 if (req->newlen != sizeof(addrs))
585 if (req->oldlen != sizeof(struct xucred))
587 error = SYSCTL_IN(req, addrs, sizeof(addrs));
590 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
591 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
594 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
595 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
596 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
598 INP_RLOCK_ASSERT(inp);
599 if (inp->inp_socket == NULL)
602 error = cr_canseesocket(req->td->td_ucred,
605 cru2x(inp->inp_cred, &xuc);
610 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
614 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
615 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
618 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
619 struct mbuf *control, struct thread *td)
621 u_int32_t ulen = m->m_pkthdr.len;
622 u_int32_t plen = sizeof(struct udphdr) + ulen;
625 struct in6_addr *laddr, *faddr, in6a;
626 struct sockaddr_in6 *sin6 = NULL;
627 struct ifnet *oifp = NULL;
628 int cscov_partial = 0;
629 int scope_ambiguous = 0;
634 struct ip6_pktopts *optp, opt;
635 int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
637 struct sockaddr_in6 tmp;
639 INP_WLOCK_ASSERT(inp);
640 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
643 /* addr6 has been validated in udp6_send(). */
644 sin6 = (struct sockaddr_in6 *)addr6;
646 /* protect *sin6 from overwrites */
651 * Application should provide a proper zone ID or the use of
652 * default zone IDs should be enabled. Unfortunately, some
653 * applications do not behave as it should, so we need a
654 * workaround. Even if an appropriate ID is not determined,
655 * we'll see if we can determine the outgoing interface. If we
656 * can, determine the zone ID based on the interface below.
658 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
660 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
665 if ((error = ip6_setpktopts(control, &opt,
666 inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0)
670 optp = inp->in6p_outputopts;
673 faddr = &sin6->sin6_addr;
676 * Since we saw no essential reason for calling in_pcbconnect,
677 * we get rid of such kind of logic, and call in6_selectsrc
678 * and in6_pcbsetport in order to fill in the local address
679 * and the local port.
681 if (sin6->sin6_port == 0) {
682 error = EADDRNOTAVAIL;
686 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
687 /* how about ::ffff:0.0.0.0 case? */
692 fport = sin6->sin6_port; /* allow 0 port */
694 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
695 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
697 * I believe we should explicitly discard the
698 * packet when mapped addresses are disabled,
699 * rather than send the packet as an IPv6 one.
700 * If we chose the latter approach, the packet
701 * might be sent out on the wire based on the
702 * default route, the situation which we'd
703 * probably want to avoid.
704 * (20010421 jinmei@kame.net)
709 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
710 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
712 * when remote addr is an IPv4-mapped address,
713 * local addr should not be an IPv6 address,
714 * since you cannot determine how to map IPv6
715 * source address to IPv4.
724 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
725 error = in6_selectsrc(sin6, optp, inp, NULL,
726 td->td_ucred, &oifp, &in6a);
729 if (oifp && scope_ambiguous &&
730 (error = in6_setscope(&sin6->sin6_addr,
736 laddr = &inp->in6p_laddr; /* XXX */
739 error = EADDRNOTAVAIL;
742 if (inp->inp_lport == 0 &&
743 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) {
744 /* Undo an address bind that may have occurred. */
745 inp->in6p_laddr = in6addr_any;
749 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
753 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
754 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
756 * XXX: this case would happen when the
757 * application sets the V6ONLY flag after
758 * connecting the foreign address.
759 * Such applications should be fixed,
762 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
763 "option was set for a connected socket\n");
769 laddr = &inp->in6p_laddr;
770 faddr = &inp->in6p_faddr;
771 fport = inp->inp_fport;
775 hlen = sizeof(struct ip);
778 * Calculate data length and get a mbuf
779 * for UDP and IP6 headers.
781 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
788 * Stuff checksum and output datagram.
790 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
791 IPPROTO_UDP : IPPROTO_UDPLITE;
792 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
793 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
794 udp6->uh_dport = fport;
795 if (nxt == IPPROTO_UDPLITE) {
799 cscov = up->u_txcslen;
802 udp6->uh_ulen = htons(cscov);
804 * For UDP-Lite, checksum coverage length of zero means
805 * the entire UDPLite packet is covered by the checksum.
807 cscov_partial = (cscov == 0) ? 0 : 1;
808 } else if (plen <= 0xffff)
809 udp6->uh_ulen = htons((u_short)plen);
816 ip6 = mtod(m, struct ip6_hdr *);
817 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK;
818 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
819 ip6->ip6_vfc |= IPV6_VERSION;
820 ip6->ip6_plen = htons((u_short)plen);
822 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
823 ip6->ip6_src = *laddr;
824 ip6->ip6_dst = *faddr;
827 if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
828 sizeof(struct ip6_hdr), plen, cscov)) == 0)
829 udp6->uh_sum = 0xffff;
831 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
832 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
833 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
837 * XXX for now assume UDP is 2-tuple.
838 * Later on this may become configurable as 4-tuple;
839 * we should support that.
841 * XXX .. and we should likely cache this in the inpcb.
844 m->m_pkthdr.flowid = rss_hash_ip6_2tuple(*faddr, *laddr);
845 M_HASHTYPE_SET(m, M_HASHTYPE_RSS_IPV6);
851 * Don't override with the inp cached flowid.
853 * Until the whole UDP path is vetted, it may actually
856 flags |= IP_NODEFAULTFLOWID;
859 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
860 UDPSTAT_INC(udps_opackets);
861 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions,
865 error = EAFNOSUPPORT;
875 ip6_clearpktopts(&opt, -1);
882 udp6_abort(struct socket *so)
885 struct inpcbinfo *pcbinfo;
887 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
889 KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
892 if (inp->inp_vflag & INP_IPV4) {
893 struct pr_usrreqs *pru;
895 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
896 (*pru->pru_abort)(so);
902 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
903 INP_HASH_WLOCK(pcbinfo);
904 in6_pcbdisconnect(inp);
905 inp->in6p_laddr = in6addr_any;
906 INP_HASH_WUNLOCK(pcbinfo);
907 soisdisconnected(so);
913 udp6_attach(struct socket *so, int proto, struct thread *td)
916 struct inpcbinfo *pcbinfo;
919 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
921 KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
923 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
924 error = soreserve(so, udp_sendspace, udp_recvspace);
928 INP_INFO_WLOCK(pcbinfo);
929 error = in_pcballoc(so, pcbinfo);
931 INP_INFO_WUNLOCK(pcbinfo);
934 inp = (struct inpcb *)so->so_pcb;
935 inp->inp_vflag |= INP_IPV6;
936 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
937 inp->inp_vflag |= INP_IPV4;
938 inp->in6p_hops = -1; /* use kernel default */
939 inp->in6p_cksum = -1; /* just to be sure */
942 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
943 * because the socket may be bound to an IPv6 wildcard address,
944 * which may match an IPv4-mapped IPv6 address.
946 inp->inp_ip_ttl = V_ip_defttl;
948 error = udp_newudpcb(inp);
952 INP_INFO_WUNLOCK(pcbinfo);
956 INP_INFO_WUNLOCK(pcbinfo);
961 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
964 struct inpcbinfo *pcbinfo;
967 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
969 KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
972 INP_HASH_WLOCK(pcbinfo);
973 inp->inp_vflag &= ~INP_IPV4;
974 inp->inp_vflag |= INP_IPV6;
975 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
976 struct sockaddr_in6 *sin6_p;
978 sin6_p = (struct sockaddr_in6 *)nam;
980 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
981 inp->inp_vflag |= INP_IPV4;
983 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
984 struct sockaddr_in sin;
986 in6_sin6_2_sin(&sin, sin6_p);
987 inp->inp_vflag |= INP_IPV4;
988 inp->inp_vflag &= ~INP_IPV6;
989 error = in_pcbbind(inp, (struct sockaddr *)&sin,
996 error = in6_pcbbind(inp, nam, td->td_ucred);
1000 INP_HASH_WUNLOCK(pcbinfo);
1006 udp6_close(struct socket *so)
1009 struct inpcbinfo *pcbinfo;
1011 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1012 inp = sotoinpcb(so);
1013 KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
1016 if (inp->inp_vflag & INP_IPV4) {
1017 struct pr_usrreqs *pru;
1019 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
1020 (*pru->pru_disconnect)(so);
1025 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1026 INP_HASH_WLOCK(pcbinfo);
1027 in6_pcbdisconnect(inp);
1028 inp->in6p_laddr = in6addr_any;
1029 INP_HASH_WUNLOCK(pcbinfo);
1030 soisdisconnected(so);
1036 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1039 struct inpcbinfo *pcbinfo;
1040 struct sockaddr_in6 *sin6;
1043 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1044 inp = sotoinpcb(so);
1045 sin6 = (struct sockaddr_in6 *)nam;
1046 KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
1049 * XXXRW: Need to clarify locking of v4/v6 flags.
1053 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1054 struct sockaddr_in sin;
1056 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1060 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1064 in6_sin6_2_sin(&sin, sin6);
1065 inp->inp_vflag |= INP_IPV4;
1066 inp->inp_vflag &= ~INP_IPV6;
1067 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
1070 INP_HASH_WLOCK(pcbinfo);
1071 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
1073 INP_HASH_WUNLOCK(pcbinfo);
1079 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1083 inp->inp_vflag &= ~INP_IPV4;
1084 inp->inp_vflag |= INP_IPV6;
1085 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1088 INP_HASH_WLOCK(pcbinfo);
1089 error = in6_pcbconnect(inp, nam, td->td_ucred);
1090 INP_HASH_WUNLOCK(pcbinfo);
1099 udp6_detach(struct socket *so)
1102 struct inpcbinfo *pcbinfo;
1105 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1106 inp = sotoinpcb(so);
1107 KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1109 INP_INFO_WLOCK(pcbinfo);
1111 up = intoudpcb(inp);
1112 KASSERT(up != NULL, ("%s: up == NULL", __func__));
1115 INP_INFO_WUNLOCK(pcbinfo);
1120 udp6_disconnect(struct socket *so)
1123 struct inpcbinfo *pcbinfo;
1126 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1127 inp = sotoinpcb(so);
1128 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1131 if (inp->inp_vflag & INP_IPV4) {
1132 struct pr_usrreqs *pru;
1134 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
1135 (void)(*pru->pru_disconnect)(so);
1142 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1147 INP_HASH_WLOCK(pcbinfo);
1148 in6_pcbdisconnect(inp);
1149 inp->in6p_laddr = in6addr_any;
1150 INP_HASH_WUNLOCK(pcbinfo);
1152 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1160 udp6_send(struct socket *so, int flags, struct mbuf *m,
1161 struct sockaddr *addr, struct mbuf *control, struct thread *td)
1164 struct inpcbinfo *pcbinfo;
1167 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1168 inp = sotoinpcb(so);
1169 KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
1173 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1177 if (addr->sa_family != AF_INET6) {
1178 error = EAFNOSUPPORT;
1184 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1186 struct sockaddr_in6 *sin6 = 0;
1189 hasv4addr = (inp->inp_vflag & INP_IPV4);
1191 sin6 = (struct sockaddr_in6 *)addr;
1192 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
1196 struct pr_usrreqs *pru;
1199 * XXXRW: We release UDP-layer locks before calling
1200 * udp_send() in order to avoid recursion. However,
1201 * this does mean there is a short window where inp's
1202 * fields are unstable. Could this lead to a
1203 * potential race in which the factors causing us to
1204 * select the UDPv4 output routine are invalidated?
1208 in6_sin6_2_sin_in_sock(addr);
1209 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
1210 /* addr will just be freed in sendit(). */
1211 return ((*pru->pru_send)(so, flags, m, addr, control,
1217 mac_inpcb_create_mbuf(inp, m);
1219 INP_HASH_WLOCK(pcbinfo);
1220 error = udp6_output(inp, m, addr, control, td);
1221 INP_HASH_WUNLOCK(pcbinfo);
1233 struct pr_usrreqs udp6_usrreqs = {
1234 .pru_abort = udp6_abort,
1235 .pru_attach = udp6_attach,
1236 .pru_bind = udp6_bind,
1237 .pru_connect = udp6_connect,
1238 .pru_control = in6_control,
1239 .pru_detach = udp6_detach,
1240 .pru_disconnect = udp6_disconnect,
1241 .pru_peeraddr = in6_mapped_peeraddr,
1242 .pru_send = udp6_send,
1243 .pru_shutdown = udp_shutdown,
1244 .pru_sockaddr = in6_mapped_sockaddr,
1245 .pru_soreceive = soreceive_dgram,
1246 .pru_sosend = sosend_dgram,
1247 .pru_sosetlabel = in_pcbsosetlabel,
1248 .pru_close = udp6_close