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. All advertising materials mentioning features or use of this software
46 * must display the following acknowledgement:
47 * This product includes software developed by the University of
48 * California, Berkeley and its contributors.
49 * 4. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93
69 #include "opt_inet6.h"
70 #include "opt_ipsec.h"
72 #include <sys/param.h>
73 #include <sys/errno.h>
74 #include <sys/kernel.h>
78 #include <sys/protosw.h>
79 #include <sys/signalvar.h>
80 #include <sys/socket.h>
81 #include <sys/socketvar.h>
84 #include <sys/sysctl.h>
85 #include <sys/syslog.h>
86 #include <sys/systm.h>
89 #include <net/if_types.h>
90 #include <net/route.h>
92 #include <netinet/in.h>
93 #include <netinet/in_pcb.h>
94 #include <netinet/in_systm.h>
95 #include <netinet/in_var.h>
96 #include <netinet/ip.h>
97 #include <netinet/ip6.h>
98 #include <netinet/icmp6.h>
99 #include <netinet/ip_var.h>
100 #include <netinet/udp.h>
101 #include <netinet/udp_var.h>
102 #include <netinet6/ip6protosw.h>
103 #include <netinet6/ip6_var.h>
104 #include <netinet6/in6_pcb.h>
105 #include <netinet6/udp6_var.h>
108 #include <netinet6/ipsec.h>
109 #include <netinet6/ipsec6.h>
113 * UDP protocol inplementation.
114 * Per RFC 768, August, 1980.
117 extern struct protosw inetsw[];
118 static int in6_mcmatch __P((struct inpcb *, struct in6_addr *, struct ifnet *));
119 static int udp6_detach __P((struct socket *so));
122 in6_mcmatch(in6p, ia6, ifp)
124 register struct in6_addr *ia6;
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(mp, offp, proto)
149 struct mbuf *m = *mp;
150 register struct ip6_hdr *ip6;
151 register struct udphdr *uh;
152 register struct inpcb *in6p;
153 struct mbuf *opts = NULL;
156 struct sockaddr_in6 udp_in6;
158 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
160 ip6 = mtod(m, struct ip6_hdr *);
162 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
163 /* XXX send icmp6 host/port unreach? */
168 udpstat.udps_ipackets++;
170 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
171 uh = (struct udphdr *)((caddr_t)ip6 + off);
172 ulen = ntohs((u_short)uh->uh_ulen);
175 udpstat.udps_badlen++;
180 * Checksum extended UDP header and data.
183 udpstat.udps_nosum++;
184 else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
185 udpstat.udps_badsum++;
189 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
193 * Deliver a multicast datagram to all sockets
194 * for which the local and remote addresses and ports match
195 * those of the incoming datagram. This allows more than
196 * one process to receive multicasts on the same port.
197 * (This really ought to be done for unicast datagrams as
198 * well, but that would cause problems with existing
199 * applications that open both address-specific sockets and
200 * a wildcard socket listening to the same port -- they would
201 * end up receiving duplicates of every unicast datagram.
202 * Those applications open the multiple sockets to overcome an
203 * inadequacy of the UDP socket interface, but for backwards
204 * compatibility we avoid the problem here rather than
205 * fixing the interface. Maybe 4.5BSD will remedy this?)
209 * In a case that laddr should be set to the link-local
210 * address (this happens in RIPng), the multicast address
211 * specified in the received packet does not match with
212 * laddr. To cure this situation, the matching is relaxed
213 * if the receiving interface is the same as one specified
214 * in the socket and if the destination multicast address
215 * matches one of the multicast groups specified in the socket.
219 * Construct sockaddr format source address.
221 init_sin6(&udp_in6, m); /* general init */
222 udp_in6.sin6_port = uh->uh_sport;
224 * KAME note: traditionally we dropped udpiphdr from mbuf here.
225 * We need udphdr for IPsec processing so we do that later.
229 * Locate pcb(s) for datagram.
230 * (Algorithm copied from raw_intr().)
233 LIST_FOREACH(in6p, &udb, inp_list) {
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 */
264 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
267 * m_copy(m, offset, ...) above.
268 * sbappendaddr() expects M_PKTHDR,
269 * and m_copy() will copy M_PKTHDR
270 * only if offset is 0.
272 if (last->in6p_flags & IN6P_CONTROLOPTS
273 || last->in6p_socket->so_options & SO_TIMESTAMP)
274 ip6_savecontrol(last, &opts,
277 m_adj(n, off + sizeof(struct udphdr));
278 if (sbappendaddr(&last->in6p_socket->so_rcv,
279 (struct sockaddr *)&udp_in6,
284 udpstat.udps_fullsock++;
286 sorwakeup(last->in6p_socket);
292 * Don't look for additional matches if this one does
293 * not have either the SO_REUSEPORT or SO_REUSEADDR
294 * socket options set. This heuristic avoids searching
295 * through all pcbs in the common case of a non-shared
296 * port. It assumes that an application will never
297 * clear these options after setting them.
299 if ((last->in6p_socket->so_options &
300 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
306 * No matching pcb found; discard datagram.
307 * (No need to send an ICMP Port Unreachable
308 * for a broadcast or multicast datgram.)
310 udpstat.udps_noport++;
311 udpstat.udps_noportmcast++;
316 * Check AH/ESP integrity.
318 if (ipsec6_in_reject_so(m, last->inp_socket)) {
319 ipsec6stat.in_polvio++;
323 if (last->in6p_flags & IN6P_CONTROLOPTS
324 || last->in6p_socket->so_options & SO_TIMESTAMP)
325 ip6_savecontrol(last, &opts, ip6, m);
327 m_adj(m, off + sizeof(struct udphdr));
328 if (sbappendaddr(&last->in6p_socket->so_rcv,
329 (struct sockaddr *)&udp_in6,
331 udpstat.udps_fullsock++;
334 sorwakeup(last->in6p_socket);
338 * Locate pcb for datagram.
340 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
341 &ip6->ip6_dst, uh->uh_dport, 1,
345 char buf[INET6_ADDRSTRLEN];
347 strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
349 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
350 buf, ntohs(uh->uh_dport),
351 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
353 udpstat.udps_noport++;
354 if (m->m_flags & M_MCAST) {
355 printf("UDP6: M_MCAST is set in a unicast packet.\n");
356 udpstat.udps_noportmcast++;
359 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
364 * Check AH/ESP integrity.
366 if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
367 ipsec6stat.in_polvio++;
373 * Construct sockaddr format source address.
374 * Stuff source address and datagram in user buffer.
376 init_sin6(&udp_in6, m); /* general init */
377 udp_in6.sin6_port = uh->uh_sport;
378 if (in6p->in6p_flags & IN6P_CONTROLOPTS
379 || in6p->in6p_socket->so_options & SO_TIMESTAMP)
380 ip6_savecontrol(in6p, &opts, ip6, m);
381 m_adj(m, off + sizeof(struct udphdr));
382 if (sbappendaddr(&in6p->in6p_socket->so_rcv,
383 (struct sockaddr *)&udp_in6,
385 udpstat.udps_fullsock++;
388 sorwakeup(in6p->in6p_socket);
399 udp6_ctlinput(cmd, sa, d)
408 struct ip6ctlparam *ip6cp = NULL;
409 const struct sockaddr_in6 *sa6_src = NULL;
410 struct inpcb *(*notify) __P((struct inpcb *, int)) = udp_notify;
411 struct udp_portonly {
416 if (sa->sa_family != AF_INET6 ||
417 sa->sa_len != sizeof(struct sockaddr_in6))
420 if ((unsigned)cmd >= PRC_NCMDS)
422 if (PRC_IS_REDIRECT(cmd))
423 notify = in6_rtchange, d = NULL;
424 else if (cmd == PRC_HOSTDEAD)
426 else if (inet6ctlerrmap[cmd] == 0)
429 /* if the parameter is from icmp6, decode it. */
431 ip6cp = (struct ip6ctlparam *)d;
433 ip6 = ip6cp->ip6c_ip6;
434 off = ip6cp->ip6c_off;
435 sa6_src = ip6cp->ip6c_src;
444 * XXX: We assume that when IPV6 is non NULL,
445 * M and OFF are valid.
448 /* check if we can safely examine src and dst ports */
449 if (m->m_pkthdr.len < off + sizeof(*uhp))
452 bzero(&uh, sizeof(uh));
453 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
455 (void) in6_pcbnotify(&udb, sa, uh.uh_dport,
456 (struct sockaddr *)ip6cp->ip6c_src,
457 uh.uh_sport, cmd, notify);
459 (void) in6_pcbnotify(&udb, sa, 0,
460 (const struct sockaddr *)sa6_src,
465 udp6_getcred(SYSCTL_HANDLER_ARGS)
468 struct sockaddr_in6 addrs[2];
472 error = suser(req->td);
476 if (req->newlen != sizeof(addrs))
478 if (req->oldlen != sizeof(struct xucred))
480 error = SYSCTL_IN(req, addrs, sizeof(addrs));
484 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
486 &addrs[0].sin6_addr, addrs[0].sin6_port,
488 if (!inp || !inp->inp_socket) {
492 cru2x(inp->inp_socket->so_cred, &xuc);
493 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
499 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
501 udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
504 udp6_abort(struct socket *so)
511 return EINVAL; /* ??? possible? panic instead? */
512 soisdisconnected(so);
520 udp6_attach(struct socket *so, int proto, struct thread *td)
529 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
530 error = soreserve(so, udp_sendspace, udp_recvspace);
535 error = in_pcballoc(so, &udbinfo, td);
539 inp = (struct inpcb *)so->so_pcb;
540 inp->inp_vflag |= INP_IPV6;
542 inp->inp_vflag |= INP_IPV4;
543 inp->in6p_hops = -1; /* use kernel default */
544 inp->in6p_cksum = -1; /* just to be sure */
547 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
548 * because the socket may be bound to an IPv6 wildcard address,
549 * which may match an IPv4-mapped IPv6 address.
551 inp->inp_ip_ttl = ip_defttl;
556 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
565 inp->inp_vflag &= ~INP_IPV4;
566 inp->inp_vflag |= INP_IPV6;
567 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
568 struct sockaddr_in6 *sin6_p;
570 sin6_p = (struct sockaddr_in6 *)nam;
572 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
573 inp->inp_vflag |= INP_IPV4;
574 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
575 struct sockaddr_in sin;
577 in6_sin6_2_sin(&sin, sin6_p);
578 inp->inp_vflag |= INP_IPV4;
579 inp->inp_vflag &= ~INP_IPV6;
581 error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
588 error = in6_pcbbind(inp, nam, td);
594 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
603 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
604 struct sockaddr_in6 *sin6_p;
606 sin6_p = (struct sockaddr_in6 *)nam;
607 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
608 struct sockaddr_in sin;
610 if (inp->inp_faddr.s_addr != INADDR_ANY)
612 in6_sin6_2_sin(&sin, sin6_p);
614 error = in_pcbconnect(inp, (struct sockaddr *)&sin, td);
617 inp->inp_vflag |= INP_IPV4;
618 inp->inp_vflag &= ~INP_IPV6;
624 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
627 error = in6_pcbconnect(inp, nam, td);
630 if (!ip6_v6only) { /* should be non mapped addr */
631 inp->inp_vflag &= ~INP_IPV4;
632 inp->inp_vflag |= INP_IPV6;
640 udp6_detach(struct socket *so)
655 udp6_disconnect(struct socket *so)
664 if (inp->inp_vflag & INP_IPV4) {
665 struct pr_usrreqs *pru;
667 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
668 return ((*pru->pru_disconnect)(so));
671 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
675 in6_pcbdisconnect(inp);
676 inp->in6p_laddr = in6addr_any;
678 so->so_state &= ~SS_ISCONNECTED; /* XXX */
683 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
684 struct mbuf *control, struct thread *td)
696 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
700 if (addr->sa_family != AF_INET6) {
701 error = EAFNOSUPPORT;
708 struct sockaddr_in6 *sin6 = 0;
711 hasv4addr = (inp->inp_vflag & INP_IPV4);
713 sin6 = (struct sockaddr_in6 *)addr;
714 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
718 struct pr_usrreqs *pru;
721 in6_sin6_2_sin_in_sock(addr);
722 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
723 error = ((*pru->pru_send)(so, flags, m, addr, control,
725 /* addr will just be freed in sendit(). */
730 return udp6_output(inp, m, addr, control, td);
737 struct pr_usrreqs udp6_usrreqs = {
738 udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
739 pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
740 pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
741 pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
742 in6_mapped_sockaddr, sosend, soreceive, sopoll