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>
85 #include <sys/thread2.h>
88 #include <net/route.h>
89 #include <net/if_types.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 #include <netinet6/ipsec.h>
108 #include <netinet6/ipsec6.h>
112 #include <netproto/ipsec/ipsec.h>
113 #include <netproto/ipsec/ipsec6.h>
114 #endif /* FAST_IPSEC */
117 * UDP protocol inplementation.
118 * Per RFC 768, August, 1980.
121 extern struct protosw inetsw[];
122 static int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *);
123 static int udp6_detach (struct socket *so);
126 in6_mcmatch(struct inpcb *in6p, struct in6_addr *ia6, struct ifnet *ifp)
128 struct ip6_moptions *im6o = in6p->in6p_moptions;
129 struct in6_multi_mship *imm;
134 for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
135 imm = imm->i6mm_chain.le_next) {
137 imm->i6mm_maddr->in6m_ifp == ifp) &&
138 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
146 udp6_input(struct mbuf **mp, int *offp, int proto)
148 struct mbuf *m = *mp;
152 struct mbuf *opts = NULL;
155 struct sockaddr_in6 udp_in6;
157 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
159 ip6 = mtod(m, struct ip6_hdr *);
161 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
162 /* XXX send icmp6 host/port unreach? */
167 udpstat.udps_ipackets++;
169 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
170 uh = (struct udphdr *)((caddr_t)ip6 + off);
171 ulen = ntohs((u_short)uh->uh_ulen);
174 udpstat.udps_badlen++;
179 * Checksum extended UDP header and data.
182 udpstat.udps_nosum++;
183 else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
184 udpstat.udps_badsum++;
188 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
192 * Deliver a multicast datagram to all sockets
193 * for which the local and remote addresses and ports match
194 * those of the incoming datagram. This allows more than
195 * one process to receive multicasts on the same port.
196 * (This really ought to be done for unicast datagrams as
197 * well, but that would cause problems with existing
198 * applications that open both address-specific sockets and
199 * a wildcard socket listening to the same port -- they would
200 * end up receiving duplicates of every unicast datagram.
201 * Those applications open the multiple sockets to overcome an
202 * inadequacy of the UDP socket interface, but for backwards
203 * compatibility we avoid the problem here rather than
204 * fixing the interface. Maybe 4.5BSD will remedy this?)
208 * In a case that laddr should be set to the link-local
209 * address (this happens in RIPng), the multicast address
210 * specified in the received packet does not match with
211 * laddr. To cure this situation, the matching is relaxed
212 * if the receiving interface is the same as one specified
213 * in the socket and if the destination multicast address
214 * matches one of the multicast groups specified in the socket.
218 * Construct sockaddr format source address.
220 init_sin6(&udp_in6, m); /* general init */
221 udp_in6.sin6_port = uh->uh_sport;
223 * KAME note: traditionally we dropped udpiphdr from mbuf here.
224 * We need udphdr for IPsec processing so we do that later.
228 * Locate pcb(s) for datagram.
229 * (Algorithm copied from raw_intr().)
232 LIST_FOREACH(in6p, &udbinfo.pcblisthead, inp_list) {
233 if (!(in6p->inp_flags & INP_PLACEMARKER))
235 if (!(in6p->inp_vflag & INP_IPV6))
237 if (in6p->in6p_lport != uh->uh_dport)
239 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
240 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
242 !in6_mcmatch(in6p, &ip6->ip6_dst,
246 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
247 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
249 in6p->in6p_fport != uh->uh_sport)
258 * Check AH/ESP integrity.
260 if (ipsec6_in_reject_so(m, last->inp_socket))
261 ipsec6stat.in_polvio++;
262 /* do not inject data into pcb */
267 * Check AH/ESP integrity.
269 if (ipsec6_in_reject(m, last))
272 #endif /* FAST_IPSEC */
273 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
276 * m_copy(m, offset, ...) above.
277 * ssb_appendaddr() expects M_PKTHDR,
278 * and m_copy() will copy M_PKTHDR
279 * only if offset is 0.
281 if (last->in6p_flags & IN6P_CONTROLOPTS
282 || last->in6p_socket->so_options & SO_TIMESTAMP)
283 ip6_savecontrol(last, &opts,
286 m_adj(n, off + sizeof(struct udphdr));
287 if (ssb_appendaddr(&last->in6p_socket->so_rcv,
288 (struct sockaddr *)&udp_in6,
293 udpstat.udps_fullsock++;
295 sorwakeup(last->in6p_socket);
301 * Don't look for additional matches if this one does
302 * not have either the SO_REUSEPORT or SO_REUSEADDR
303 * socket options set. This heuristic avoids searching
304 * through all pcbs in the common case of a non-shared
305 * port. It assumes that an application will never
306 * clear these options after setting them.
308 if ((last->in6p_socket->so_options &
309 (SO_REUSEPORT | SO_REUSEADDR)) == 0)
315 * No matching pcb found; discard datagram.
316 * (No need to send an ICMP Port Unreachable
317 * for a broadcast or multicast datgram.)
319 udpstat.udps_noport++;
320 udpstat.udps_noportmcast++;
325 * Check AH/ESP integrity.
327 if (ipsec6_in_reject_so(m, last->inp_socket)) {
328 ipsec6stat.in_polvio++;
334 * Check AH/ESP integrity.
336 if (ipsec6_in_reject(m, last)) {
339 #endif /* FAST_IPSEC */
340 if (last->in6p_flags & IN6P_CONTROLOPTS
341 || last->in6p_socket->so_options & SO_TIMESTAMP)
342 ip6_savecontrol(last, &opts, ip6, m);
344 m_adj(m, off + sizeof(struct udphdr));
345 if (ssb_appendaddr(&last->in6p_socket->so_rcv,
346 (struct sockaddr *)&udp_in6,
348 udpstat.udps_fullsock++;
351 sorwakeup(last->in6p_socket);
355 * Locate pcb for datagram.
357 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
358 &ip6->ip6_dst, uh->uh_dport, 1,
362 char buf[INET6_ADDRSTRLEN];
364 strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
366 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
367 buf, ntohs(uh->uh_dport),
368 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
370 udpstat.udps_noport++;
371 if (m->m_flags & M_MCAST) {
372 kprintf("UDP6: M_MCAST is set in a unicast packet.\n");
373 udpstat.udps_noportmcast++;
376 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
381 * Check AH/ESP integrity.
383 if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
384 ipsec6stat.in_polvio++;
390 * Check AH/ESP integrity.
392 if (ipsec6_in_reject(m, in6p)) {
395 #endif /* FAST_IPSEC */
398 * Construct sockaddr format source address.
399 * Stuff source address and datagram in user buffer.
401 init_sin6(&udp_in6, m); /* general init */
402 udp_in6.sin6_port = uh->uh_sport;
403 if (in6p->in6p_flags & IN6P_CONTROLOPTS
404 || in6p->in6p_socket->so_options & SO_TIMESTAMP)
405 ip6_savecontrol(in6p, &opts, ip6, m);
406 m_adj(m, off + sizeof(struct udphdr));
407 if (ssb_appendaddr(&in6p->in6p_socket->so_rcv,
408 (struct sockaddr *)&udp_in6,
410 udpstat.udps_fullsock++;
413 sorwakeup(in6p->in6p_socket);
424 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
430 struct ip6ctlparam *ip6cp = NULL;
431 const struct sockaddr_in6 *sa6_src = NULL;
432 void (*notify) (struct inpcb *, int) = udp_notify;
433 struct udp_portonly {
438 if (sa->sa_family != AF_INET6 ||
439 sa->sa_len != sizeof(struct sockaddr_in6))
442 if ((unsigned)cmd >= PRC_NCMDS)
444 if (PRC_IS_REDIRECT(cmd))
445 notify = in6_rtchange, d = NULL;
446 else if (cmd == PRC_HOSTDEAD)
448 else if (inet6ctlerrmap[cmd] == 0)
451 /* if the parameter is from icmp6, decode it. */
453 ip6cp = (struct ip6ctlparam *)d;
455 ip6 = ip6cp->ip6c_ip6;
456 off = ip6cp->ip6c_off;
457 sa6_src = ip6cp->ip6c_src;
466 * XXX: We assume that when IPV6 is non NULL,
467 * M and OFF are valid.
470 /* check if we can safely examine src and dst ports */
471 if (m->m_pkthdr.len < off + sizeof(*uhp))
474 bzero(&uh, sizeof(uh));
475 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
477 in6_pcbnotify(&udbinfo.pcblisthead, sa, uh.uh_dport,
478 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport,
481 in6_pcbnotify(&udbinfo.pcblisthead, sa, 0,
482 (const struct sockaddr *)sa6_src, 0,
487 udp6_getcred(SYSCTL_HANDLER_ARGS)
489 struct sockaddr_in6 addrs[2];
493 error = suser(req->td);
497 if (req->newlen != sizeof(addrs))
499 if (req->oldlen != sizeof(struct ucred))
501 error = SYSCTL_IN(req, addrs, sizeof(addrs));
505 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
507 &addrs[0].sin6_addr, addrs[0].sin6_port,
509 if (!inp || !inp->inp_socket) {
513 error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
514 sizeof(struct ucred));
521 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
523 udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
526 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.ssb_hiwat == 0 || so->so_rcv.ssb_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)) {
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)) {
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);
652 if (!prison_remote_ip(td, nam))
653 return(EAFNOSUPPORT); /* IPv4 only jail */
655 error = in6_pcbconnect(inp, nam, td);
658 if (!ip6_v6only) { /* should be non mapped addr */
659 inp->inp_vflag &= ~INP_IPV4;
660 inp->inp_vflag |= INP_IPV6;
663 } else if (error == EAFNOSUPPORT) { /* connection dissolved */
665 * Follow traditional BSD behavior and retain
666 * the local port binding. But, fix the old misbehavior
667 * of overwriting any previously bound local address.
669 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
670 inp->in6p_laddr = kin6addr_any;
671 in_pcbinswildcardhash(inp);
677 udp6_detach(struct socket *so)
691 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 .pru_abort = udp6_abort,
773 .pru_accept = pru_accept_notsupp,
774 .pru_attach = udp6_attach,
775 .pru_bind = udp6_bind,
776 .pru_connect = udp6_connect,
777 .pru_connect2 = pru_connect2_notsupp,
778 .pru_control = in6_control,
779 .pru_detach = udp6_detach,
780 .pru_disconnect = udp6_disconnect,
781 .pru_listen = pru_listen_notsupp,
782 .pru_peeraddr = in6_mapped_peeraddr,
783 .pru_rcvd = pru_rcvd_notsupp,
784 .pru_rcvoob = pru_rcvoob_notsupp,
785 .pru_send = udp6_send,
786 .pru_sense = pru_sense_null,
787 .pru_shutdown = udp_shutdown,
788 .pru_sockaddr = in6_mapped_sockaddr,
789 .pru_sosend = sosend,
790 .pru_soreceive = soreceive,