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 $ */
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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/kernel.h>
75 #include <sys/protosw.h>
76 #include <sys/socket.h>
77 #include <sys/socketvar.h>
78 #include <sys/sysctl.h>
79 #include <sys/errno.h>
81 #include <sys/systm.h>
82 #include <sys/syslog.h>
86 #include <sys/thread2.h>
87 #include <sys/socketvar2.h>
88 #include <sys/msgport2.h>
91 #include <net/route.h>
92 #include <net/if_types.h>
94 #include <netinet/in.h>
95 #include <netinet/in_systm.h>
96 #include <netinet/ip.h>
97 #include <netinet/in_pcb.h>
98 #include <netinet/in_var.h>
99 #include <netinet/ip_var.h>
100 #include <netinet/udp.h>
101 #include <netinet/udp_var.h>
102 #include <netinet/ip6.h>
103 #include <netinet6/ip6_var.h>
104 #include <netinet6/in6_pcb.h>
105 #include <netinet/icmp6.h>
106 #include <netinet6/udp6_var.h>
107 #include <netinet6/ip6protosw.h>
110 #include <netinet6/ipsec.h>
111 #include <netinet6/ipsec6.h>
115 #include <netproto/ipsec/ipsec.h>
116 #include <netproto/ipsec/ipsec6.h>
117 #endif /* FAST_IPSEC */
120 * UDP protocol inplementation.
121 * Per RFC 768, August, 1980.
124 extern struct protosw inetsw[];
125 static int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *);
128 in6_mcmatch(struct inpcb *in6p, struct in6_addr *ia6, struct ifnet *ifp)
130 struct ip6_moptions *im6o = in6p->in6p_moptions;
131 struct in6_multi_mship *imm;
136 for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
137 imm = imm->i6mm_chain.le_next) {
139 imm->i6mm_maddr->in6m_ifp == ifp) &&
140 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
148 udp6_input(struct mbuf **mp, int *offp, int proto)
150 struct mbuf *m = *mp;
154 struct mbuf *opts = NULL;
157 struct sockaddr_in6 udp_in6;
160 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
162 ip6 = mtod(m, struct ip6_hdr *);
164 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
165 /* XXX send icmp6 host/port unreach? */
170 udpstat.udps_ipackets++;
172 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
173 uh = (struct udphdr *)((caddr_t)ip6 + off);
174 ulen = ntohs((u_short)uh->uh_ulen);
177 udpstat.udps_badlen++;
182 * Checksum extended UDP header and data.
185 udpstat.udps_nosum++;
186 else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
187 udpstat.udps_badsum++;
191 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
195 * Deliver a multicast datagram to all sockets
196 * for which the local and remote addresses and ports match
197 * those of the incoming datagram. This allows more than
198 * one process to receive multicasts on the same port.
199 * (This really ought to be done for unicast datagrams as
200 * well, but that would cause problems with existing
201 * applications that open both address-specific sockets and
202 * a wildcard socket listening to the same port -- they would
203 * end up receiving duplicates of every unicast datagram.
204 * Those applications open the multiple sockets to overcome an
205 * inadequacy of the UDP socket interface, but for backwards
206 * compatibility we avoid the problem here rather than
207 * fixing the interface. Maybe 4.5BSD will remedy this?)
211 * In a case that laddr should be set to the link-local
212 * address (this happens in RIPng), the multicast address
213 * specified in the received packet does not match with
214 * laddr. To cure this situation, the matching is relaxed
215 * if the receiving interface is the same as one specified
216 * in the socket and if the destination multicast address
217 * matches one of the multicast groups specified in the socket.
221 * Construct sockaddr format source address.
223 init_sin6(&udp_in6, m); /* general init */
224 udp_in6.sin6_port = uh->uh_sport;
226 * KAME note: traditionally we dropped udpiphdr from mbuf here.
227 * We need udphdr for IPsec processing so we do that later.
231 * Locate pcb(s) for datagram.
232 * (Algorithm copied from raw_intr().)
235 LIST_FOREACH(in6p, &udbinfo.pcblisthead, inp_list) {
236 KKASSERT((in6p->inp_flags & INP_PLACEMARKER) == 0);
238 if (!(in6p->inp_vflag & INP_IPV6))
240 if (in6p->in6p_lport != uh->uh_dport)
242 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
243 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
245 !in6_mcmatch(in6p, &ip6->ip6_dst,
249 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
250 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
252 in6p->in6p_fport != uh->uh_sport)
261 * Check AH/ESP integrity.
263 if (ipsec6_in_reject_so(m, last->inp_socket))
264 ipsec6stat.in_polvio++;
265 /* do not inject data into pcb */
270 * Check AH/ESP integrity.
272 if (ipsec6_in_reject(m, last))
275 #endif /* FAST_IPSEC */
276 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
279 * m_copy(m, offset, ...) above.
280 * ssb_appendaddr() expects M_PKTHDR,
281 * and m_copy() will copy M_PKTHDR
282 * only if offset is 0.
284 so = last->in6p_socket;
285 if ((last->in6p_flags & IN6P_CONTROLOPTS) ||
286 (so->so_options & SO_TIMESTAMP)) {
287 ip6_savecontrol(last, &opts,
290 m_adj(n, off + sizeof(struct udphdr));
291 lwkt_gettoken(&so->so_rcv.ssb_token);
292 if (ssb_appendaddr(&so->so_rcv,
293 (struct sockaddr *)&udp_in6,
298 udpstat.udps_fullsock++;
302 lwkt_reltoken(&so->so_rcv.ssb_token);
308 * Don't look for additional matches if this one does
309 * not have either the SO_REUSEPORT or SO_REUSEADDR
310 * socket options set. This heuristic avoids searching
311 * through all pcbs in the common case of a non-shared
312 * port. It assumes that an application will never
313 * clear these options after setting them.
315 if ((last->in6p_socket->so_options &
316 (SO_REUSEPORT | SO_REUSEADDR)) == 0)
322 * No matching pcb found; discard datagram.
323 * (No need to send an ICMP Port Unreachable
324 * for a broadcast or multicast datgram.)
326 udpstat.udps_noport++;
327 udpstat.udps_noportmcast++;
332 * Check AH/ESP integrity.
334 if (ipsec6_in_reject_so(m, last->inp_socket)) {
335 ipsec6stat.in_polvio++;
341 * Check AH/ESP integrity.
343 if (ipsec6_in_reject(m, last)) {
346 #endif /* FAST_IPSEC */
347 if (last->in6p_flags & IN6P_CONTROLOPTS
348 || last->in6p_socket->so_options & SO_TIMESTAMP)
349 ip6_savecontrol(last, &opts, ip6, m);
351 m_adj(m, off + sizeof(struct udphdr));
352 so = last->in6p_socket;
353 lwkt_gettoken(&so->so_rcv.ssb_token);
354 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6,
356 udpstat.udps_fullsock++;
357 lwkt_reltoken(&so->so_rcv.ssb_token);
361 lwkt_reltoken(&so->so_rcv.ssb_token);
365 * Locate pcb for datagram.
367 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
368 &ip6->ip6_dst, uh->uh_dport, 1,
372 char buf[INET6_ADDRSTRLEN];
374 strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
376 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
377 buf, ntohs(uh->uh_dport),
378 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
380 udpstat.udps_noport++;
381 if (m->m_flags & M_MCAST) {
382 kprintf("UDP6: M_MCAST is set in a unicast packet.\n");
383 udpstat.udps_noportmcast++;
386 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
391 * Check AH/ESP integrity.
393 if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
394 ipsec6stat.in_polvio++;
400 * Check AH/ESP integrity.
402 if (ipsec6_in_reject(m, in6p)) {
405 #endif /* FAST_IPSEC */
408 * Construct sockaddr format source address.
409 * Stuff source address and datagram in user buffer.
411 init_sin6(&udp_in6, m); /* general init */
412 udp_in6.sin6_port = uh->uh_sport;
413 if (in6p->in6p_flags & IN6P_CONTROLOPTS
414 || in6p->in6p_socket->so_options & SO_TIMESTAMP)
415 ip6_savecontrol(in6p, &opts, ip6, m);
416 m_adj(m, off + sizeof(struct udphdr));
417 so = in6p->in6p_socket;
418 lwkt_gettoken(&so->so_rcv.ssb_token);
419 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6,
421 udpstat.udps_fullsock++;
422 lwkt_reltoken(&so->so_rcv.ssb_token);
426 lwkt_reltoken(&so->so_rcv.ssb_token);
437 udp6_ctlinput(netmsg_t msg)
439 int cmd = msg->ctlinput.nm_cmd;
440 struct sockaddr *sa = msg->ctlinput.nm_arg;
441 void *d = msg->ctlinput.nm_extra;
446 struct ip6ctlparam *ip6cp = NULL;
447 const struct sockaddr_in6 *sa6_src = NULL;
448 void (*notify) (struct inpcb *, int) = udp_notify;
449 struct udp_portonly {
454 if (sa->sa_family != AF_INET6 ||
455 sa->sa_len != sizeof(struct sockaddr_in6))
458 if ((unsigned)cmd >= PRC_NCMDS)
460 if (PRC_IS_REDIRECT(cmd))
461 notify = in6_rtchange, d = NULL;
462 else if (cmd == PRC_HOSTDEAD)
464 else if (inet6ctlerrmap[cmd] == 0)
467 /* if the parameter is from icmp6, decode it. */
469 ip6cp = (struct ip6ctlparam *)d;
471 ip6 = ip6cp->ip6c_ip6;
472 off = ip6cp->ip6c_off;
473 sa6_src = ip6cp->ip6c_src;
482 * XXX: We assume that when IPV6 is non NULL,
483 * M and OFF are valid.
486 /* check if we can safely examine src and dst ports */
487 if (m->m_pkthdr.len < off + sizeof(*uhp))
490 bzero(&uh, sizeof(uh));
491 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
493 in6_pcbnotify(&udbinfo.pcblisthead, sa, uh.uh_dport,
494 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport,
497 in6_pcbnotify(&udbinfo.pcblisthead, sa, 0,
498 (const struct sockaddr *)sa6_src, 0,
502 lwkt_replymsg(&msg->ctlinput.base.lmsg, 0);
506 udp6_getcred(SYSCTL_HANDLER_ARGS)
508 struct sockaddr_in6 addrs[2];
512 error = priv_check(req->td, PRIV_ROOT);
516 if (req->newlen != sizeof(addrs))
518 if (req->oldlen != sizeof(struct ucred))
520 error = SYSCTL_IN(req, addrs, sizeof(addrs));
524 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
526 &addrs[0].sin6_addr, addrs[0].sin6_port,
528 if (!inp || !inp->inp_socket) {
532 error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
533 sizeof(struct ucred));
540 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
542 udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
545 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
546 * will sofree() it when we return.
549 udp6_abort(netmsg_t msg)
551 struct socket *so = msg->abort.base.nm_so;
557 soisdisconnected(so);
559 udbinfo_barrier_set();
561 udbinfo_barrier_rem();
566 lwkt_replymsg(&msg->abort.base.lmsg, error);
570 udp6_attach(netmsg_t msg)
572 struct socket *so = msg->attach.base.nm_so;
573 struct pru_attach_info *ai = msg->attach.nm_ai;
583 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
584 error = soreserve(so, udp_sendspace, udp_recvspace,
590 udbinfo_barrier_set();
591 error = in_pcballoc(so, &udbinfo);
592 udbinfo_barrier_rem();
597 sosetport(so, netisr_portfn(0));
598 inp = (struct inpcb *)so->so_pcb;
599 inp->inp_vflag |= INP_IPV6;
601 inp->inp_vflag |= INP_IPV4;
602 inp->in6p_hops = -1; /* use kernel default */
603 inp->in6p_cksum = -1; /* just to be sure */
606 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
607 * because the socket may be bound to an IPv6 wildcard address,
608 * which may match an IPv4-mapped IPv6 address.
610 inp->inp_ip_ttl = ip_defttl;
613 lwkt_replymsg(&msg->attach.base.lmsg, error);
617 udp6_bind(netmsg_t msg)
619 struct socket *so =msg->bind.base.nm_so;
620 struct sockaddr *nam = msg->bind.nm_nam;
621 struct thread *td = msg->bind.nm_td;
622 struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
632 inp->inp_vflag &= ~INP_IPV4;
633 inp->inp_vflag |= INP_IPV6;
634 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) {
635 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
636 inp->inp_vflag |= INP_IPV4;
637 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
638 struct sockaddr_in sin;
640 in6_sin6_2_sin(&sin, sin6_p);
641 inp->inp_vflag |= INP_IPV4;
642 inp->inp_vflag &= ~INP_IPV6;
644 error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
651 error = in6_pcbbind(inp, nam, td);
654 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
655 inp->inp_flags |= INP_WASBOUND_NOTANY;
657 udbinfo_barrier_set();
658 in_pcbinswildcardhash(inp);
659 udbinfo_barrier_rem();
662 lwkt_replymsg(&msg->bind.base.lmsg, error);
666 udp6_connect(netmsg_t msg)
668 struct socket *so = msg->connect.base.nm_so;
669 struct sockaddr *nam = msg->connect.nm_nam;
670 struct thread *td = msg->connect.nm_td;
674 udbinfo_barrier_set();
682 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) {
683 struct sockaddr_in6 *sin6_p;
685 sin6_p = (struct sockaddr_in6 *)nam;
686 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
687 struct sockaddr_in sin;
689 if (inp->inp_faddr.s_addr != INADDR_ANY) {
693 in6_sin6_2_sin(&sin, sin6_p);
695 if (inp->inp_flags & INP_WILDCARD)
696 in_pcbremwildcardhash(inp);
697 error = in_pcbconnect(inp, (struct sockaddr *)&sin, td);
700 inp->inp_vflag |= INP_IPV4;
701 inp->inp_vflag &= ~INP_IPV6;
707 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
711 if (inp->inp_flags & INP_WILDCARD)
712 in_pcbremwildcardhash(inp);
713 if (!prison_remote_ip(td, nam)) {
714 error = EAFNOSUPPORT; /* IPv4 only jail */
718 error = in6_pcbconnect(inp, nam, td);
721 if (!ip6_v6only) { /* should be non mapped addr */
722 inp->inp_vflag &= ~INP_IPV4;
723 inp->inp_vflag |= INP_IPV6;
726 } else if (error == EAFNOSUPPORT) { /* connection dissolved */
728 * Follow traditional BSD behavior and retain
729 * the local port binding. But, fix the old misbehavior
730 * of overwriting any previously bound local address.
732 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
733 inp->in6p_laddr = kin6addr_any;
734 in_pcbinswildcardhash(inp);
737 udbinfo_barrier_rem();
738 lwkt_replymsg(&msg->connect.base.lmsg, error);
742 udp6_detach(netmsg_t msg)
744 struct socket *so = msg->detach.base.nm_so;
750 udbinfo_barrier_set();
752 udbinfo_barrier_rem();
757 lwkt_replymsg(&msg->detach.base.lmsg, error);
761 udp6_disconnect(netmsg_t msg)
763 struct socket *so = msg->disconnect.base.nm_so;
773 if (inp->inp_vflag & INP_IPV4) {
774 const struct pr_usrreqs *pru;
776 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
777 pru->pru_disconnect(msg); /* XXX on right port? */
781 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
784 udbinfo_barrier_set();
785 in6_pcbdisconnect(inp);
786 udbinfo_barrier_rem();
787 soclrstate(so, SS_ISCONNECTED); /* XXX */
791 lwkt_replymsg(&msg->disconnect.base.lmsg, error);
795 udp6_send(netmsg_t msg)
797 struct socket *so = msg->send.base.nm_so;
798 struct mbuf *m = msg->send.nm_m;
799 struct sockaddr *addr = msg->send.nm_addr;
800 struct mbuf *control = msg->send.nm_control;
801 struct thread *td = msg->send.nm_td;
812 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
816 if (addr->sa_family != AF_INET6) {
817 error = EAFNOSUPPORT;
824 struct sockaddr_in6 *sin6 = NULL;
827 hasv4addr = (inp->inp_vflag & INP_IPV4);
829 sin6 = (struct sockaddr_in6 *)addr;
830 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
834 const struct pr_usrreqs *pru;
837 in6_sin6_2_sin_in_sock(addr);
838 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
840 /* msg invalid now */
845 error = udp6_output(inp, m, addr, control, td);
846 lwkt_replymsg(&msg->send.base.lmsg, error);
850 lwkt_replymsg(&msg->send.base.lmsg, error);
853 struct pr_usrreqs udp6_usrreqs = {
854 .pru_abort = udp6_abort,
855 .pru_accept = pr_generic_notsupp,
856 .pru_attach = udp6_attach,
857 .pru_bind = udp6_bind,
858 .pru_connect = udp6_connect,
859 .pru_connect2 = pr_generic_notsupp,
860 .pru_control = in6_control_dispatch,
861 .pru_detach = udp6_detach,
862 .pru_disconnect = udp6_disconnect,
863 .pru_listen = pr_generic_notsupp,
864 .pru_peeraddr = in6_mapped_peeraddr_dispatch,
865 .pru_rcvd = pr_generic_notsupp,
866 .pru_rcvoob = pr_generic_notsupp,
867 .pru_send = udp6_send,
868 .pru_sense = pru_sense_null,
869 .pru_shutdown = udp_shutdown,
870 .pru_sockaddr = in6_mapped_sockaddr_dispatch,
871 .pru_sosend = sosend,
872 .pru_soreceive = soreceive