1 /* $FreeBSD: src/sys/netinet6/udp6_usrreq.c,v 1.6.2.13 2003/01/24 05:11:35 sam Exp $ */
2 /* $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ */
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * Copyright (c) 1982, 1986, 1989, 1993
35 * The Regents of the University of California. All rights reserved.
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
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 University 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.
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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
61 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93
65 #include "opt_inet6.h"
67 #include <sys/param.h>
68 #include <sys/kernel.h>
70 #include <sys/protosw.h>
71 #include <sys/socket.h>
72 #include <sys/socketvar.h>
73 #include <sys/sysctl.h>
74 #include <sys/errno.h>
76 #include <sys/systm.h>
77 #include <sys/syslog.h>
82 #include <sys/thread2.h>
83 #include <sys/socketvar2.h>
84 #include <sys/msgport2.h>
87 #include <net/route.h>
88 #include <net/if_types.h>
89 #include <net/netisr2.h>
91 #include <netinet/in.h>
92 #include <netinet/in_systm.h>
93 #include <netinet/ip.h>
94 #include <netinet/in_pcb.h>
95 #include <netinet/in_var.h>
96 #include <netinet/ip_var.h>
97 #include <netinet/udp.h>
98 #include <netinet/udp_var.h>
99 #include <netinet/ip6.h>
100 #include <netinet6/ip6_var.h>
101 #include <netinet6/in6_pcb.h>
102 #include <netinet/icmp6.h>
103 #include <netinet6/udp6_var.h>
104 #include <netinet6/ip6protosw.h>
107 * UDP protocol inplementation.
108 * Per RFC 768, August, 1980.
111 extern struct protosw inetsw[];
112 static int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *);
115 in6_mcmatch(struct inpcb *in6p, struct in6_addr *ia6, struct ifnet *ifp)
117 struct ip6_moptions *im6o = in6p->in6p_moptions;
118 struct in6_multi_mship *imm;
123 for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
124 imm = imm->i6mm_chain.le_next) {
126 imm->i6mm_maddr->in6m_ifp == ifp) &&
127 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
135 udp6_input(struct mbuf **mp, int *offp, int proto)
137 struct mbuf *m = *mp;
141 struct mbuf *opts = NULL;
144 struct sockaddr_in6 udp_in6;
146 struct inpcbinfo *pcbinfo = &udbinfo[0];
148 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
150 ip6 = mtod(m, struct ip6_hdr *);
152 udp_stat.udps_ipackets++;
154 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
155 uh = (struct udphdr *)((caddr_t)ip6 + off);
156 ulen = ntohs((u_short)uh->uh_ulen);
159 udp_stat.udps_badlen++;
164 * Checksum extended UDP header and data.
167 udp_stat.udps_nosum++;
168 else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
169 udp_stat.udps_badsum++;
173 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
174 struct inpcb *last, *marker;
177 * Deliver a multicast datagram to all sockets
178 * for which the local and remote addresses and ports match
179 * those of the incoming datagram. This allows more than
180 * one process to receive multicasts on the same port.
181 * (This really ought to be done for unicast datagrams as
182 * well, but that would cause problems with existing
183 * applications that open both address-specific sockets and
184 * a wildcard socket listening to the same port -- they would
185 * end up receiving duplicates of every unicast datagram.
186 * Those applications open the multiple sockets to overcome an
187 * inadequacy of the UDP socket interface, but for backwards
188 * compatibility we avoid the problem here rather than
189 * fixing the interface. Maybe 4.5BSD will remedy this?)
193 * In a case that laddr should be set to the link-local
194 * address (this happens in RIPng), the multicast address
195 * specified in the received packet does not match with
196 * laddr. To cure this situation, the matching is relaxed
197 * if the receiving interface is the same as one specified
198 * in the socket and if the destination multicast address
199 * matches one of the multicast groups specified in the socket.
203 * Construct sockaddr format source address.
205 init_sin6(&udp_in6, m); /* general init */
206 udp_in6.sin6_port = uh->uh_sport;
208 * KAME note: traditionally we dropped udpiphdr from mbuf here.
212 * Locate pcb(s) for datagram.
213 * (Algorithm copied from raw_intr().)
217 marker = in_pcbmarker();
219 GET_PCBINFO_TOKEN(pcbinfo);
221 LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
222 while ((in6p = LIST_NEXT(marker, inp_list)) != NULL) {
223 LIST_REMOVE(marker, inp_list);
224 LIST_INSERT_AFTER(in6p, marker, inp_list);
226 if (in6p->inp_flags & INP_PLACEMARKER)
228 if (!INP_ISIPV6(in6p))
230 if (in6p->in6p_lport != uh->uh_dport)
232 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
233 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
235 !in6_mcmatch(in6p, &ip6->ip6_dst,
239 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
240 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
242 in6p->in6p_fport != uh->uh_sport)
249 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
252 * m_copy(m, offset, ...) above.
253 * ssb_appendaddr() expects M_PKTHDR,
254 * and m_copy() will copy M_PKTHDR
255 * only if offset is 0.
257 so = last->in6p_socket;
258 if ((last->in6p_flags & IN6P_CONTROLOPTS) ||
259 (so->so_options & SO_TIMESTAMP)) {
260 ip6_savecontrol(last, &opts,
263 m_adj(n, off + sizeof(struct udphdr));
264 lwkt_gettoken(&so->so_rcv.ssb_token);
265 if (ssb_appendaddr(&so->so_rcv,
266 (struct sockaddr *)&udp_in6,
271 udp_stat.udps_fullsock++;
276 lwkt_reltoken(&so->so_rcv.ssb_token);
282 * Don't look for additional matches if this one does
283 * not have either the SO_REUSEPORT or SO_REUSEADDR
284 * socket options set. This heuristic avoids searching
285 * through all pcbs in the common case of a non-shared
286 * port. It assumes that an application will never
287 * clear these options after setting them.
289 if ((last->in6p_socket->so_options &
290 (SO_REUSEPORT | SO_REUSEADDR)) == 0)
293 LIST_REMOVE(marker, inp_list);
295 REL_PCBINFO_TOKEN(pcbinfo);
299 * No matching pcb found; discard datagram.
300 * (No need to send an ICMP Port Unreachable
301 * for a broadcast or multicast datgram.)
303 udp_stat.udps_noport++;
304 udp_stat.udps_noportmcast++;
307 if (last->in6p_flags & IN6P_CONTROLOPTS
308 || last->in6p_socket->so_options & SO_TIMESTAMP)
309 ip6_savecontrol(last, &opts, ip6, m);
311 m_adj(m, off + sizeof(struct udphdr));
312 so = last->in6p_socket;
313 lwkt_gettoken(&so->so_rcv.ssb_token);
314 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6,
316 udp_stat.udps_fullsock++;
318 lwkt_reltoken(&so->so_rcv.ssb_token);
322 lwkt_reltoken(&so->so_rcv.ssb_token);
326 * Locate pcb for datagram.
328 in6p = in6_pcblookup_hash(pcbinfo, &ip6->ip6_src, uh->uh_sport,
329 &ip6->ip6_dst, uh->uh_dport, 1,
333 char buf[INET6_ADDRSTRLEN];
335 strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
337 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
338 buf, ntohs(uh->uh_dport),
339 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
341 udp_stat.udps_noport++;
342 if (m->m_flags & M_MCAST) {
343 kprintf("UDP6: M_MCAST is set in a unicast packet.\n");
344 udp_stat.udps_noportmcast++;
347 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
352 * Construct sockaddr format source address.
353 * Stuff source address and datagram in user buffer.
355 init_sin6(&udp_in6, m); /* general init */
356 udp_in6.sin6_port = uh->uh_sport;
357 if (in6p->in6p_flags & IN6P_CONTROLOPTS
358 || in6p->in6p_socket->so_options & SO_TIMESTAMP)
359 ip6_savecontrol(in6p, &opts, ip6, m);
360 m_adj(m, off + sizeof(struct udphdr));
361 so = in6p->in6p_socket;
362 lwkt_gettoken(&so->so_rcv.ssb_token);
363 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6,
365 udp_stat.udps_fullsock++;
367 lwkt_reltoken(&so->so_rcv.ssb_token);
371 lwkt_reltoken(&so->so_rcv.ssb_token);
382 udp6_ctlinput(netmsg_t msg)
384 int cmd = msg->ctlinput.nm_cmd;
385 struct sockaddr *sa = msg->ctlinput.nm_arg;
386 void *d = msg->ctlinput.nm_extra;
391 struct ip6ctlparam *ip6cp = NULL;
392 const struct sockaddr_in6 *sa6_src = NULL;
393 inp_notify_t notify = udp_notify;
394 struct udp_portonly {
399 if (sa->sa_family != AF_INET6 ||
400 sa->sa_len != sizeof(struct sockaddr_in6))
403 if ((unsigned)cmd >= PRC_NCMDS)
405 if (PRC_IS_REDIRECT(cmd))
406 notify = in6_rtchange, d = NULL;
407 else if (cmd == PRC_HOSTDEAD)
409 else if (inet6ctlerrmap[cmd] == 0)
412 /* if the parameter is from icmp6, decode it. */
414 ip6cp = (struct ip6ctlparam *)d;
416 ip6 = ip6cp->ip6c_ip6;
417 off = ip6cp->ip6c_off;
418 sa6_src = ip6cp->ip6c_src;
427 * XXX: We assume that when IPV6 is non NULL,
428 * M and OFF are valid.
431 /* check if we can safely examine src and dst ports */
432 if (m->m_pkthdr.len < off + sizeof(*uhp))
435 bzero(&uh, sizeof(uh));
436 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
438 in6_pcbnotify(&udbinfo[0], sa, uh.uh_dport,
439 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport,
442 in6_pcbnotify(&udbinfo[0], sa, 0,
443 (const struct sockaddr *)sa6_src, 0,
447 lwkt_replymsg(&msg->ctlinput.base.lmsg, 0);
451 udp6_getcred(SYSCTL_HANDLER_ARGS)
453 struct sockaddr_in6 addrs[2];
457 error = priv_check(req->td, PRIV_ROOT);
461 if (req->newlen != sizeof(addrs))
463 if (req->oldlen != sizeof(struct ucred))
465 error = SYSCTL_IN(req, addrs, sizeof(addrs));
469 inp = in6_pcblookup_hash(&udbinfo[0], &addrs[1].sin6_addr,
471 &addrs[0].sin6_addr, addrs[0].sin6_port,
473 if (!inp || !inp->inp_socket) {
477 error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
478 sizeof(struct ucred));
485 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
487 udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
490 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
491 * will sofree() it when we return.
494 udp6_abort(netmsg_t msg)
496 struct socket *so = msg->abort.base.nm_so;
502 soisdisconnected(so);
509 lwkt_replymsg(&msg->abort.base.lmsg, error);
513 udp6_attach(netmsg_t msg)
515 struct socket *so = msg->attach.base.nm_so;
516 struct pru_attach_info *ai = msg->attach.nm_ai;
526 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
527 error = soreserve(so, udp_sendspace, udp_recvspace,
533 error = in_pcballoc(so, &udbinfo[0]);
537 inp = (struct inpcb *)so->so_pcb;
538 inp->in6p_hops = -1; /* use kernel default */
539 inp->in6p_cksum = -1; /* just to be sure */
542 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
543 * because the socket may be bound to an IPv6 wildcard address,
544 * which may match an IPv4-mapped IPv6 address.
546 inp->inp_ip_ttl = ip_defttl;
549 lwkt_replymsg(&msg->attach.base.lmsg, error);
553 udp6_bind(netmsg_t msg)
555 struct socket *so =msg->bind.base.nm_so;
556 struct sockaddr *nam = msg->bind.nm_nam;
557 struct thread *td = msg->bind.nm_td;
558 struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
568 error = in6_pcbbind(inp, nam, td);
570 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
571 inp->inp_flags |= INP_WASBOUND_NOTANY;
572 in_pcbinswildcardhash(inp);
575 lwkt_replymsg(&msg->bind.base.lmsg, error);
579 udp6_connect(netmsg_t msg)
581 struct socket *so = msg->connect.base.nm_so;
582 struct sockaddr *nam = msg->connect.nm_nam;
583 struct thread *td = msg->connect.nm_td;
584 struct sockaddr_in6 *sin6_p;
594 sin6_p = (struct sockaddr_in6 *)nam;
595 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
596 error = EADDRNOTAVAIL;
600 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
604 if (inp->inp_flags & INP_WILDCARD)
605 in_pcbremwildcardhash(inp);
606 if (!prison_remote_ip(td, nam)) {
607 error = EAFNOSUPPORT; /* IPv4 only jail */
610 error = in6_pcbconnect(inp, nam, td);
613 } else if (error == EAFNOSUPPORT) { /* connection dissolved */
615 * Follow traditional BSD behavior and retain
616 * the local port binding. But, fix the old misbehavior
617 * of overwriting any previously bound local address.
619 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
620 inp->in6p_laddr = kin6addr_any;
621 in_pcbinswildcardhash(inp);
624 lwkt_replymsg(&msg->connect.base.lmsg, error);
628 udp6_detach(netmsg_t msg)
630 struct socket *so = msg->detach.base.nm_so;
641 lwkt_replymsg(&msg->detach.base.lmsg, error);
645 udp6_disconnect(netmsg_t msg)
647 struct socket *so = msg->disconnect.base.nm_so;
657 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
660 in6_pcbdisconnect(inp);
661 soclrstate(so, SS_ISCONNECTED); /* XXX */
665 lwkt_replymsg(&msg->disconnect.base.lmsg, error);
669 udp6_send(netmsg_t msg)
671 struct socket *so = msg->send.base.nm_so;
672 struct mbuf *m = msg->send.nm_m;
673 struct sockaddr *addr = msg->send.nm_addr;
674 struct mbuf *control = msg->send.nm_control;
675 struct thread *td = msg->send.nm_td;
686 struct sockaddr_in6 *sin6;
688 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
692 if (addr->sa_family != AF_INET6) {
693 error = EAFNOSUPPORT;
697 sin6 = (struct sockaddr_in6 *)addr;
698 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
699 error = EADDRNOTAVAIL;
704 error = udp6_output(inp, m, addr, control, td);
705 lwkt_replymsg(&msg->send.base.lmsg, error);
709 lwkt_replymsg(&msg->send.base.lmsg, error);
712 struct pr_usrreqs udp6_usrreqs = {
713 .pru_abort = udp6_abort,
714 .pru_accept = pr_generic_notsupp,
715 .pru_attach = udp6_attach,
716 .pru_bind = udp6_bind,
717 .pru_connect = udp6_connect,
718 .pru_connect2 = pr_generic_notsupp,
719 .pru_control = in6_control_dispatch,
720 .pru_detach = udp6_detach,
721 .pru_disconnect = udp6_disconnect,
722 .pru_listen = pr_generic_notsupp,
723 .pru_peeraddr = in6_setpeeraddr_dispatch,
724 .pru_rcvd = pr_generic_notsupp,
725 .pru_rcvoob = pr_generic_notsupp,
726 .pru_send = udp6_send,
727 .pru_sense = pru_sense_null,
728 .pru_shutdown = udp_shutdown,
729 .pru_sockaddr = in6_setsockaddr_dispatch,
730 .pru_sosend = sosend,
731 .pru_soreceive = soreceive