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 1.26 2007/04/22 01:13:14 dillon Exp $ */
3 /* $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ */
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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 <sys/thread2.h>
88 #include <sys/socketvar2.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 *);
126 static int udp6_detach (struct socket *so);
129 in6_mcmatch(struct inpcb *in6p, struct in6_addr *ia6, struct ifnet *ifp)
131 struct ip6_moptions *im6o = in6p->in6p_moptions;
132 struct in6_multi_mship *imm;
137 for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
138 imm = imm->i6mm_chain.le_next) {
140 imm->i6mm_maddr->in6m_ifp == ifp) &&
141 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
149 udp6_input(struct mbuf **mp, int *offp, int proto)
151 struct mbuf *m = *mp;
155 struct mbuf *opts = NULL;
158 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 if (in6p->inp_flags & INP_PLACEMARKER)
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 if (last->in6p_flags & IN6P_CONTROLOPTS
285 || last->in6p_socket->so_options & SO_TIMESTAMP)
286 ip6_savecontrol(last, &opts,
289 m_adj(n, off + sizeof(struct udphdr));
290 if (ssb_appendaddr(&last->in6p_socket->so_rcv,
291 (struct sockaddr *)&udp_in6,
296 udpstat.udps_fullsock++;
298 sorwakeup(last->in6p_socket);
304 * Don't look for additional matches if this one does
305 * not have either the SO_REUSEPORT or SO_REUSEADDR
306 * socket options set. This heuristic avoids searching
307 * through all pcbs in the common case of a non-shared
308 * port. It assumes that an application will never
309 * clear these options after setting them.
311 if ((last->in6p_socket->so_options &
312 (SO_REUSEPORT | SO_REUSEADDR)) == 0)
318 * No matching pcb found; discard datagram.
319 * (No need to send an ICMP Port Unreachable
320 * for a broadcast or multicast datgram.)
322 udpstat.udps_noport++;
323 udpstat.udps_noportmcast++;
328 * Check AH/ESP integrity.
330 if (ipsec6_in_reject_so(m, last->inp_socket)) {
331 ipsec6stat.in_polvio++;
337 * Check AH/ESP integrity.
339 if (ipsec6_in_reject(m, last)) {
342 #endif /* FAST_IPSEC */
343 if (last->in6p_flags & IN6P_CONTROLOPTS
344 || last->in6p_socket->so_options & SO_TIMESTAMP)
345 ip6_savecontrol(last, &opts, ip6, m);
347 m_adj(m, off + sizeof(struct udphdr));
348 if (ssb_appendaddr(&last->in6p_socket->so_rcv,
349 (struct sockaddr *)&udp_in6,
351 udpstat.udps_fullsock++;
354 sorwakeup(last->in6p_socket);
358 * Locate pcb for datagram.
360 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
361 &ip6->ip6_dst, uh->uh_dport, 1,
365 char buf[INET6_ADDRSTRLEN];
367 strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
369 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
370 buf, ntohs(uh->uh_dport),
371 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
373 udpstat.udps_noport++;
374 if (m->m_flags & M_MCAST) {
375 kprintf("UDP6: M_MCAST is set in a unicast packet.\n");
376 udpstat.udps_noportmcast++;
379 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
384 * Check AH/ESP integrity.
386 if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
387 ipsec6stat.in_polvio++;
393 * Check AH/ESP integrity.
395 if (ipsec6_in_reject(m, in6p)) {
398 #endif /* FAST_IPSEC */
401 * Construct sockaddr format source address.
402 * Stuff source address and datagram in user buffer.
404 init_sin6(&udp_in6, m); /* general init */
405 udp_in6.sin6_port = uh->uh_sport;
406 if (in6p->in6p_flags & IN6P_CONTROLOPTS
407 || in6p->in6p_socket->so_options & SO_TIMESTAMP)
408 ip6_savecontrol(in6p, &opts, ip6, m);
409 m_adj(m, off + sizeof(struct udphdr));
410 if (ssb_appendaddr(&in6p->in6p_socket->so_rcv,
411 (struct sockaddr *)&udp_in6,
413 udpstat.udps_fullsock++;
416 sorwakeup(in6p->in6p_socket);
427 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
433 struct ip6ctlparam *ip6cp = NULL;
434 const struct sockaddr_in6 *sa6_src = NULL;
435 void (*notify) (struct inpcb *, int) = udp_notify;
436 struct udp_portonly {
441 if (sa->sa_family != AF_INET6 ||
442 sa->sa_len != sizeof(struct sockaddr_in6))
445 if ((unsigned)cmd >= PRC_NCMDS)
447 if (PRC_IS_REDIRECT(cmd))
448 notify = in6_rtchange, d = NULL;
449 else if (cmd == PRC_HOSTDEAD)
451 else if (inet6ctlerrmap[cmd] == 0)
454 /* if the parameter is from icmp6, decode it. */
456 ip6cp = (struct ip6ctlparam *)d;
458 ip6 = ip6cp->ip6c_ip6;
459 off = ip6cp->ip6c_off;
460 sa6_src = ip6cp->ip6c_src;
469 * XXX: We assume that when IPV6 is non NULL,
470 * M and OFF are valid.
473 /* check if we can safely examine src and dst ports */
474 if (m->m_pkthdr.len < off + sizeof(*uhp))
477 bzero(&uh, sizeof(uh));
478 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
480 in6_pcbnotify(&udbinfo.pcblisthead, sa, uh.uh_dport,
481 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport,
484 in6_pcbnotify(&udbinfo.pcblisthead, sa, 0,
485 (const struct sockaddr *)sa6_src, 0,
490 udp6_getcred(SYSCTL_HANDLER_ARGS)
492 struct sockaddr_in6 addrs[2];
496 error = priv_check(req->td, PRIV_ROOT);
500 if (req->newlen != sizeof(addrs))
502 if (req->oldlen != sizeof(struct ucred))
504 error = SYSCTL_IN(req, addrs, sizeof(addrs));
508 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
510 &addrs[0].sin6_addr, addrs[0].sin6_port,
512 if (!inp || !inp->inp_socket) {
516 error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
517 sizeof(struct ucred));
524 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
526 udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
529 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
530 * will sofree() it when we return.
533 udp6_abort(struct socket *so)
540 soisdisconnected(so);
551 udp6_attach(struct socket *so, int proto, struct pru_attach_info *ai)
560 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
561 error = soreserve(so, udp_sendspace, udp_recvspace,
567 error = in_pcballoc(so, &udbinfo);
571 so->so_port = udp_soport_attach(so);
572 inp = (struct inpcb *)so->so_pcb;
573 inp->inp_vflag |= INP_IPV6;
575 inp->inp_vflag |= INP_IPV4;
576 inp->in6p_hops = -1; /* use kernel default */
577 inp->in6p_cksum = -1; /* just to be sure */
580 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
581 * because the socket may be bound to an IPv6 wildcard address,
582 * which may match an IPv4-mapped IPv6 address.
584 inp->inp_ip_ttl = ip_defttl;
589 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
591 struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
599 inp->inp_vflag &= ~INP_IPV4;
600 inp->inp_vflag |= INP_IPV6;
601 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) {
602 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
603 inp->inp_vflag |= INP_IPV4;
604 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
605 struct sockaddr_in sin;
607 in6_sin6_2_sin(&sin, sin6_p);
608 inp->inp_vflag |= INP_IPV4;
609 inp->inp_vflag &= ~INP_IPV6;
611 error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
618 error = in6_pcbbind(inp, nam, td);
621 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
622 inp->inp_flags |= INP_WASBOUND_NOTANY;
623 in_pcbinswildcardhash(inp);
629 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
638 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) {
639 struct sockaddr_in6 *sin6_p;
641 sin6_p = (struct sockaddr_in6 *)nam;
642 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
643 struct sockaddr_in sin;
645 if (inp->inp_faddr.s_addr != INADDR_ANY)
647 in6_sin6_2_sin(&sin, sin6_p);
649 error = in_pcbconnect(inp, (struct sockaddr *)&sin, td);
652 inp->inp_vflag |= INP_IPV4;
653 inp->inp_vflag &= ~INP_IPV6;
659 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
661 if (inp->inp_flags & INP_WILDCARD)
662 in_pcbremwildcardhash(inp);
663 if (!prison_remote_ip(td, nam))
664 return(EAFNOSUPPORT); /* IPv4 only jail */
666 error = in6_pcbconnect(inp, nam, td);
669 if (!ip6_v6only) { /* should be non mapped addr */
670 inp->inp_vflag &= ~INP_IPV4;
671 inp->inp_vflag |= INP_IPV6;
673 /* sosetport(so, port); here, see udp v4 code */
675 } else if (error == EAFNOSUPPORT) { /* connection dissolved */
677 * Follow traditional BSD behavior and retain
678 * the local port binding. But, fix the old misbehavior
679 * of overwriting any previously bound local address.
681 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
682 inp->in6p_laddr = kin6addr_any;
683 in_pcbinswildcardhash(inp);
689 udp6_detach(struct socket *so)
703 udp6_disconnect(struct socket *so)
711 if (inp->inp_vflag & INP_IPV4) {
712 const struct pr_usrreqs *pru;
714 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
715 return ((*pru->pru_disconnect)(so));
718 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
722 in6_pcbdisconnect(inp);
724 soclrstate(so, SS_ISCONNECTED); /* XXX */
729 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
730 struct mbuf *control, struct thread *td)
742 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
746 if (addr->sa_family != AF_INET6) {
747 error = EAFNOSUPPORT;
754 struct sockaddr_in6 *sin6 = 0;
757 hasv4addr = (inp->inp_vflag & INP_IPV4);
759 sin6 = (struct sockaddr_in6 *)addr;
760 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
764 const struct pr_usrreqs *pru;
767 in6_sin6_2_sin_in_sock(addr);
768 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
769 error = ((*pru->pru_send)(so, flags, m, addr,
771 /* addr will just be freed in sendit(). */
776 return udp6_output(inp, m, addr, control, td);
783 struct pr_usrreqs udp6_usrreqs = {
784 .pru_abort = udp6_abort,
785 .pru_accept = pru_accept_notsupp,
786 .pru_attach = udp6_attach,
787 .pru_bind = udp6_bind,
788 .pru_connect = udp6_connect,
789 .pru_connect2 = pru_connect2_notsupp,
790 .pru_control = in6_control,
791 .pru_detach = udp6_detach,
792 .pru_disconnect = udp6_disconnect,
793 .pru_listen = pru_listen_notsupp,
794 .pru_peeraddr = in6_mapped_peeraddr,
795 .pru_rcvd = pru_rcvd_notsupp,
796 .pru_rcvoob = pru_rcvoob_notsupp,
797 .pru_send = udp6_send,
798 .pru_sense = pru_sense_null,
799 .pru_shutdown = udp_shutdown,
800 .pru_sockaddr = in6_mapped_sockaddr,
801 .pru_sosend = sosend,
802 .pru_soreceive = soreceive