1 /* $FreeBSD: src/sys/netinet6/udp6_usrreq.c,v 1.6.2.13 2003/01/24 05:11:35 sam Exp $ */
2 /* $DragonFly: src/sys/netinet6/udp6_usrreq.c,v 1.18 2005/02/08 22:56:19 hsu Exp $ */
3 /* $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ */
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Copyright (c) 1982, 1986, 1989, 1993
36 * The Regents of the University of California. All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. All advertising materials mentioning features or use of this software
47 * must display the following acknowledgement:
48 * This product includes software developed by the University of
49 * California, Berkeley and its contributors.
50 * 4. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93
70 #include "opt_inet6.h"
71 #include "opt_ipsec.h"
73 #include <sys/param.h>
74 #include <sys/kernel.h>
76 #include <sys/protosw.h>
77 #include <sys/socket.h>
78 #include <sys/socketvar.h>
79 #include <sys/sysctl.h>
80 #include <sys/errno.h>
82 #include <sys/systm.h>
83 #include <sys/syslog.h>
87 #include <net/route.h>
88 #include <net/if_types.h>
90 #include <netinet/in.h>
91 #include <netinet/in_systm.h>
92 #include <netinet/ip.h>
93 #include <netinet/in_pcb.h>
94 #include <netinet/in_var.h>
95 #include <netinet/ip_var.h>
96 #include <netinet/udp.h>
97 #include <netinet/udp_var.h>
98 #include <netinet/ip6.h>
99 #include <netinet6/ip6_var.h>
100 #include <netinet6/in6_pcb.h>
101 #include <netinet/icmp6.h>
102 #include <netinet6/udp6_var.h>
103 #include <netinet6/ip6protosw.h>
106 #include <netinet6/ipsec.h>
107 #include <netinet6/ipsec6.h>
111 #include <netproto/ipsec/ipsec.h>
112 #include <netproto/ipsec/ipsec6.h>
113 #endif /* FAST_IPSEC */
116 * UDP protocol inplementation.
117 * Per RFC 768, August, 1980.
120 extern struct protosw inetsw[];
121 static int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *);
122 static int udp6_detach (struct socket *so);
125 in6_mcmatch(struct inpcb *in6p, struct in6_addr *ia6, struct ifnet *ifp)
127 struct ip6_moptions *im6o = in6p->in6p_moptions;
128 struct in6_multi_mship *imm;
133 for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
134 imm = imm->i6mm_chain.le_next) {
136 imm->i6mm_maddr->in6m_ifp == ifp) &&
137 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
145 udp6_input(struct mbuf **mp, int *offp, int proto)
147 struct mbuf *m = *mp;
151 struct mbuf *opts = NULL;
154 struct sockaddr_in6 udp_in6;
156 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
158 ip6 = mtod(m, struct ip6_hdr *);
160 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
161 /* XXX send icmp6 host/port unreach? */
166 udpstat.udps_ipackets++;
168 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
169 uh = (struct udphdr *)((caddr_t)ip6 + off);
170 ulen = ntohs((u_short)uh->uh_ulen);
173 udpstat.udps_badlen++;
178 * Checksum extended UDP header and data.
181 udpstat.udps_nosum++;
182 else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
183 udpstat.udps_badsum++;
187 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
191 * Deliver a multicast datagram to all sockets
192 * for which the local and remote addresses and ports match
193 * those of the incoming datagram. This allows more than
194 * one process to receive multicasts on the same port.
195 * (This really ought to be done for unicast datagrams as
196 * well, but that would cause problems with existing
197 * applications that open both address-specific sockets and
198 * a wildcard socket listening to the same port -- they would
199 * end up receiving duplicates of every unicast datagram.
200 * Those applications open the multiple sockets to overcome an
201 * inadequacy of the UDP socket interface, but for backwards
202 * compatibility we avoid the problem here rather than
203 * fixing the interface. Maybe 4.5BSD will remedy this?)
207 * In a case that laddr should be set to the link-local
208 * address (this happens in RIPng), the multicast address
209 * specified in the received packet does not match with
210 * laddr. To cure this situation, the matching is relaxed
211 * if the receiving interface is the same as one specified
212 * in the socket and if the destination multicast address
213 * matches one of the multicast groups specified in the socket.
217 * Construct sockaddr format source address.
219 init_sin6(&udp_in6, m); /* general init */
220 udp_in6.sin6_port = uh->uh_sport;
222 * KAME note: traditionally we dropped udpiphdr from mbuf here.
223 * We need udphdr for IPsec processing so we do that later.
227 * Locate pcb(s) for datagram.
228 * (Algorithm copied from raw_intr().)
231 LIST_FOREACH(in6p, &udbinfo.pcblisthead, inp_list) {
232 if ((in6p->inp_flags & INP_PLACEMARKER) == 0)
234 if ((in6p->inp_vflag & INP_IPV6) == 0)
236 if (in6p->in6p_lport != uh->uh_dport)
238 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
239 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
241 !in6_mcmatch(in6p, &ip6->ip6_dst,
245 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
246 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
248 in6p->in6p_fport != uh->uh_sport)
257 * Check AH/ESP integrity.
259 if (ipsec6_in_reject_so(m, last->inp_socket))
260 ipsec6stat.in_polvio++;
261 /* do not inject data into pcb */
266 * Check AH/ESP integrity.
268 if (ipsec6_in_reject(m, last))
271 #endif /* FAST_IPSEC */
272 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
275 * m_copy(m, offset, ...) above.
276 * sbappendaddr() expects M_PKTHDR,
277 * and m_copy() will copy M_PKTHDR
278 * only if offset is 0.
280 if (last->in6p_flags & IN6P_CONTROLOPTS
281 || last->in6p_socket->so_options & SO_TIMESTAMP)
282 ip6_savecontrol(last, &opts,
285 m_adj(n, off + sizeof(struct udphdr));
286 if (sbappendaddr(&last->in6p_socket->so_rcv,
287 (struct sockaddr *)&udp_in6,
292 udpstat.udps_fullsock++;
294 sorwakeup(last->in6p_socket);
300 * Don't look for additional matches if this one does
301 * not have either the SO_REUSEPORT or SO_REUSEADDR
302 * socket options set. This heuristic avoids searching
303 * through all pcbs in the common case of a non-shared
304 * port. It assumes that an application will never
305 * clear these options after setting them.
307 if ((last->in6p_socket->so_options &
308 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
314 * No matching pcb found; discard datagram.
315 * (No need to send an ICMP Port Unreachable
316 * for a broadcast or multicast datgram.)
318 udpstat.udps_noport++;
319 udpstat.udps_noportmcast++;
324 * Check AH/ESP integrity.
326 if (ipsec6_in_reject_so(m, last->inp_socket)) {
327 ipsec6stat.in_polvio++;
333 * Check AH/ESP integrity.
335 if (ipsec6_in_reject(m, last)) {
338 #endif /* FAST_IPSEC */
339 if (last->in6p_flags & IN6P_CONTROLOPTS
340 || last->in6p_socket->so_options & SO_TIMESTAMP)
341 ip6_savecontrol(last, &opts, ip6, m);
343 m_adj(m, off + sizeof(struct udphdr));
344 if (sbappendaddr(&last->in6p_socket->so_rcv,
345 (struct sockaddr *)&udp_in6,
347 udpstat.udps_fullsock++;
350 sorwakeup(last->in6p_socket);
354 * Locate pcb for datagram.
356 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
357 &ip6->ip6_dst, uh->uh_dport, 1,
361 char buf[INET6_ADDRSTRLEN];
363 strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
365 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
366 buf, ntohs(uh->uh_dport),
367 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
369 udpstat.udps_noport++;
370 if (m->m_flags & M_MCAST) {
371 printf("UDP6: M_MCAST is set in a unicast packet.\n");
372 udpstat.udps_noportmcast++;
375 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
380 * Check AH/ESP integrity.
382 if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
383 ipsec6stat.in_polvio++;
389 * Check AH/ESP integrity.
391 if (ipsec6_in_reject(m, in6p)) {
394 #endif /* FAST_IPSEC */
397 * Construct sockaddr format source address.
398 * Stuff source address and datagram in user buffer.
400 init_sin6(&udp_in6, m); /* general init */
401 udp_in6.sin6_port = uh->uh_sport;
402 if (in6p->in6p_flags & IN6P_CONTROLOPTS
403 || in6p->in6p_socket->so_options & SO_TIMESTAMP)
404 ip6_savecontrol(in6p, &opts, ip6, m);
405 m_adj(m, off + sizeof(struct udphdr));
406 if (sbappendaddr(&in6p->in6p_socket->so_rcv,
407 (struct sockaddr *)&udp_in6,
409 udpstat.udps_fullsock++;
412 sorwakeup(in6p->in6p_socket);
423 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
429 struct ip6ctlparam *ip6cp = NULL;
430 const struct sockaddr_in6 *sa6_src = NULL;
431 void (*notify) (struct inpcb *, int) = udp_notify;
432 struct udp_portonly {
437 if (sa->sa_family != AF_INET6 ||
438 sa->sa_len != sizeof(struct sockaddr_in6))
441 if ((unsigned)cmd >= PRC_NCMDS)
443 if (PRC_IS_REDIRECT(cmd))
444 notify = in6_rtchange, d = NULL;
445 else if (cmd == PRC_HOSTDEAD)
447 else if (inet6ctlerrmap[cmd] == 0)
450 /* if the parameter is from icmp6, decode it. */
452 ip6cp = (struct ip6ctlparam *)d;
454 ip6 = ip6cp->ip6c_ip6;
455 off = ip6cp->ip6c_off;
456 sa6_src = ip6cp->ip6c_src;
465 * XXX: We assume that when IPV6 is non NULL,
466 * M and OFF are valid.
469 /* check if we can safely examine src and dst ports */
470 if (m->m_pkthdr.len < off + sizeof(*uhp))
473 bzero(&uh, sizeof(uh));
474 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
476 (void) in6_pcbnotify(&udbinfo.pcblisthead, sa, uh.uh_dport,
477 (struct sockaddr *)ip6cp->ip6c_src,
478 uh.uh_sport, cmd, notify);
480 (void) in6_pcbnotify(&udbinfo.pcblisthead, sa, 0,
481 (const struct sockaddr *)sa6_src,
486 udp6_getcred(SYSCTL_HANDLER_ARGS)
488 struct sockaddr_in6 addrs[2];
492 error = suser(req->td);
496 if (req->newlen != sizeof(addrs))
498 if (req->oldlen != sizeof(struct ucred))
500 error = SYSCTL_IN(req, addrs, sizeof(addrs));
504 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
506 &addrs[0].sin6_addr, addrs[0].sin6_port,
508 if (!inp || !inp->inp_socket) {
512 error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
513 sizeof(struct ucred));
520 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
522 udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
525 udp6_abort(struct socket *so)
532 return EINVAL; /* ??? possible? panic instead? */
533 soisdisconnected(so);
541 udp6_attach(struct socket *so, int proto, struct pru_attach_info *ai)
550 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
551 error = soreserve(so, udp_sendspace, udp_recvspace,
557 error = in_pcballoc(so, &udbinfo);
561 inp = (struct inpcb *)so->so_pcb;
562 inp->inp_vflag |= INP_IPV6;
564 inp->inp_vflag |= INP_IPV4;
565 inp->in6p_hops = -1; /* use kernel default */
566 inp->in6p_cksum = -1; /* just to be sure */
569 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
570 * because the socket may be bound to an IPv6 wildcard address,
571 * which may match an IPv4-mapped IPv6 address.
573 inp->inp_ip_ttl = ip_defttl;
578 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
580 struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
588 inp->inp_vflag &= ~INP_IPV4;
589 inp->inp_vflag |= INP_IPV6;
590 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
591 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
592 inp->inp_vflag |= INP_IPV4;
593 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
594 struct sockaddr_in sin;
596 in6_sin6_2_sin(&sin, sin6_p);
597 inp->inp_vflag |= INP_IPV4;
598 inp->inp_vflag &= ~INP_IPV6;
600 error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
607 error = in6_pcbbind(inp, nam, td);
610 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
611 inp->inp_flags |= INP_WASBOUND_NOTANY;
612 in_pcbinswildcardhash(inp);
618 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
627 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
628 struct sockaddr_in6 *sin6_p;
630 sin6_p = (struct sockaddr_in6 *)nam;
631 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
632 struct sockaddr_in sin;
634 if (inp->inp_faddr.s_addr != INADDR_ANY)
636 in6_sin6_2_sin(&sin, sin6_p);
638 error = in_pcbconnect(inp, (struct sockaddr *)&sin, td);
641 inp->inp_vflag |= INP_IPV4;
642 inp->inp_vflag &= ~INP_IPV6;
648 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
650 if (inp->inp_flags & INP_WILDCARD)
651 in_pcbremwildcardhash(inp);
653 error = in6_pcbconnect(inp, nam, td);
656 if (!ip6_v6only) { /* should be non mapped addr */
657 inp->inp_vflag &= ~INP_IPV4;
658 inp->inp_vflag |= INP_IPV6;
661 } else if (error == EAFNOSUPPORT) { /* connection dissolved */
663 * Follow traditional BSD behavior and retain
664 * the local port binding. But, fix the old misbehavior
665 * of overwriting any previously bound local address.
667 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
668 inp->in6p_laddr = in6addr_any;
669 in_pcbinswildcardhash(inp);
675 udp6_detach(struct socket *so)
690 udp6_disconnect(struct socket *so)
699 if (inp->inp_vflag & INP_IPV4) {
700 const struct pr_usrreqs *pru;
702 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
703 return ((*pru->pru_disconnect)(so));
706 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
710 in6_pcbdisconnect(inp);
712 so->so_state &= ~SS_ISCONNECTED; /* XXX */
717 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
718 struct mbuf *control, struct thread *td)
730 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
734 if (addr->sa_family != AF_INET6) {
735 error = EAFNOSUPPORT;
742 struct sockaddr_in6 *sin6 = 0;
745 hasv4addr = (inp->inp_vflag & INP_IPV4);
747 sin6 = (struct sockaddr_in6 *)addr;
748 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
752 const struct pr_usrreqs *pru;
755 in6_sin6_2_sin_in_sock(addr);
756 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
757 error = ((*pru->pru_send)(so, flags, m, addr,
759 /* addr will just be freed in sendit(). */
764 return udp6_output(inp, m, addr, control, td);
771 struct pr_usrreqs udp6_usrreqs = {
772 udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
773 pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
774 pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
775 pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
776 in6_mapped_sockaddr, sosend, soreceive, sopoll