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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61 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93
65 #include "opt_inet6.h"
66 #include "opt_ipsec.h"
68 #include <sys/param.h>
69 #include <sys/kernel.h>
71 #include <sys/protosw.h>
72 #include <sys/socket.h>
73 #include <sys/socketvar.h>
74 #include <sys/sysctl.h>
75 #include <sys/errno.h>
77 #include <sys/systm.h>
78 #include <sys/syslog.h>
82 #include <sys/thread2.h>
83 #include <sys/socketvar2.h>
84 #include <sys/msgport2.h>
87 #include <net/route.h>
88 #include <net/if_types.h>
89 #include <net/netisr2.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 *);
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 struct inpcbinfo *pcbinfo = &udbinfo[0];
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 udp_stat.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 udp_stat.udps_badlen++;
180 * Checksum extended UDP header and data.
183 udp_stat.udps_nosum++;
184 else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
185 udp_stat.udps_badsum++;
189 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
190 struct inpcb *last, *marker;
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().)
234 marker = in_pcbmarker(mycpuid);
236 GET_PCBINFO_TOKEN(pcbinfo);
238 LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
239 while ((in6p = LIST_NEXT(marker, inp_list)) != NULL) {
240 LIST_REMOVE(marker, inp_list);
241 LIST_INSERT_AFTER(in6p, marker, inp_list);
243 if (in6p->inp_flags & INP_PLACEMARKER)
245 if (!INP_ISIPV6(in6p))
247 if (in6p->in6p_lport != uh->uh_dport)
249 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
250 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
252 !in6_mcmatch(in6p, &ip6->ip6_dst,
256 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
257 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
259 in6p->in6p_fport != uh->uh_sport)
268 * Check AH/ESP integrity.
270 if (ipsec6_in_reject_so(m, last->inp_socket))
271 ipsec6stat.in_polvio++;
272 /* do not inject data into pcb */
277 * Check AH/ESP integrity.
279 if (ipsec6_in_reject(m, last))
282 #endif /* FAST_IPSEC */
283 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
286 * m_copy(m, offset, ...) above.
287 * ssb_appendaddr() expects M_PKTHDR,
288 * and m_copy() will copy M_PKTHDR
289 * only if offset is 0.
291 so = last->in6p_socket;
292 if ((last->in6p_flags & IN6P_CONTROLOPTS) ||
293 (so->so_options & SO_TIMESTAMP)) {
294 ip6_savecontrol(last, &opts,
297 m_adj(n, off + sizeof(struct udphdr));
298 lwkt_gettoken(&so->so_rcv.ssb_token);
299 if (ssb_appendaddr(&so->so_rcv,
300 (struct sockaddr *)&udp_in6,
305 udp_stat.udps_fullsock++;
309 lwkt_reltoken(&so->so_rcv.ssb_token);
315 * Don't look for additional matches if this one does
316 * not have either the SO_REUSEPORT or SO_REUSEADDR
317 * socket options set. This heuristic avoids searching
318 * through all pcbs in the common case of a non-shared
319 * port. It assumes that an application will never
320 * clear these options after setting them.
322 if ((last->in6p_socket->so_options &
323 (SO_REUSEPORT | SO_REUSEADDR)) == 0)
326 LIST_REMOVE(marker, inp_list);
328 REL_PCBINFO_TOKEN(pcbinfo);
332 * No matching pcb found; discard datagram.
333 * (No need to send an ICMP Port Unreachable
334 * for a broadcast or multicast datgram.)
336 udp_stat.udps_noport++;
337 udp_stat.udps_noportmcast++;
342 * Check AH/ESP integrity.
344 if (ipsec6_in_reject_so(m, last->inp_socket)) {
345 ipsec6stat.in_polvio++;
351 * Check AH/ESP integrity.
353 if (ipsec6_in_reject(m, last)) {
356 #endif /* FAST_IPSEC */
357 if (last->in6p_flags & IN6P_CONTROLOPTS
358 || last->in6p_socket->so_options & SO_TIMESTAMP)
359 ip6_savecontrol(last, &opts, ip6, m);
361 m_adj(m, off + sizeof(struct udphdr));
362 so = last->in6p_socket;
363 lwkt_gettoken(&so->so_rcv.ssb_token);
364 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6,
366 udp_stat.udps_fullsock++;
367 lwkt_reltoken(&so->so_rcv.ssb_token);
371 lwkt_reltoken(&so->so_rcv.ssb_token);
375 * Locate pcb for datagram.
377 in6p = in6_pcblookup_hash(pcbinfo, &ip6->ip6_src, uh->uh_sport,
378 &ip6->ip6_dst, uh->uh_dport, 1,
382 char buf[INET6_ADDRSTRLEN];
384 strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
386 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
387 buf, ntohs(uh->uh_dport),
388 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
390 udp_stat.udps_noport++;
391 if (m->m_flags & M_MCAST) {
392 kprintf("UDP6: M_MCAST is set in a unicast packet.\n");
393 udp_stat.udps_noportmcast++;
396 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
401 * Check AH/ESP integrity.
403 if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
404 ipsec6stat.in_polvio++;
410 * Check AH/ESP integrity.
412 if (ipsec6_in_reject(m, in6p)) {
415 #endif /* FAST_IPSEC */
418 * Construct sockaddr format source address.
419 * Stuff source address and datagram in user buffer.
421 init_sin6(&udp_in6, m); /* general init */
422 udp_in6.sin6_port = uh->uh_sport;
423 if (in6p->in6p_flags & IN6P_CONTROLOPTS
424 || in6p->in6p_socket->so_options & SO_TIMESTAMP)
425 ip6_savecontrol(in6p, &opts, ip6, m);
426 m_adj(m, off + sizeof(struct udphdr));
427 so = in6p->in6p_socket;
428 lwkt_gettoken(&so->so_rcv.ssb_token);
429 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6,
431 udp_stat.udps_fullsock++;
432 lwkt_reltoken(&so->so_rcv.ssb_token);
436 lwkt_reltoken(&so->so_rcv.ssb_token);
447 udp6_ctlinput(netmsg_t msg)
449 int cmd = msg->ctlinput.nm_cmd;
450 struct sockaddr *sa = msg->ctlinput.nm_arg;
451 void *d = msg->ctlinput.nm_extra;
456 struct ip6ctlparam *ip6cp = NULL;
457 const struct sockaddr_in6 *sa6_src = NULL;
458 inp_notify_t notify = udp_notify;
459 struct udp_portonly {
464 if (sa->sa_family != AF_INET6 ||
465 sa->sa_len != sizeof(struct sockaddr_in6))
468 if ((unsigned)cmd >= PRC_NCMDS)
470 if (PRC_IS_REDIRECT(cmd))
471 notify = in6_rtchange, d = NULL;
472 else if (cmd == PRC_HOSTDEAD)
474 else if (inet6ctlerrmap[cmd] == 0)
477 /* if the parameter is from icmp6, decode it. */
479 ip6cp = (struct ip6ctlparam *)d;
481 ip6 = ip6cp->ip6c_ip6;
482 off = ip6cp->ip6c_off;
483 sa6_src = ip6cp->ip6c_src;
492 * XXX: We assume that when IPV6 is non NULL,
493 * M and OFF are valid.
496 /* check if we can safely examine src and dst ports */
497 if (m->m_pkthdr.len < off + sizeof(*uhp))
500 bzero(&uh, sizeof(uh));
501 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
503 in6_pcbnotify(&udbinfo[0], sa, uh.uh_dport,
504 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport,
507 in6_pcbnotify(&udbinfo[0], sa, 0,
508 (const struct sockaddr *)sa6_src, 0,
512 lwkt_replymsg(&msg->ctlinput.base.lmsg, 0);
516 udp6_getcred(SYSCTL_HANDLER_ARGS)
518 struct sockaddr_in6 addrs[2];
522 error = priv_check(req->td, PRIV_ROOT);
526 if (req->newlen != sizeof(addrs))
528 if (req->oldlen != sizeof(struct ucred))
530 error = SYSCTL_IN(req, addrs, sizeof(addrs));
534 inp = in6_pcblookup_hash(&udbinfo[0], &addrs[1].sin6_addr,
536 &addrs[0].sin6_addr, addrs[0].sin6_port,
538 if (!inp || !inp->inp_socket) {
542 error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
543 sizeof(struct ucred));
550 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
552 udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
555 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
556 * will sofree() it when we return.
559 udp6_abort(netmsg_t msg)
561 struct socket *so = msg->abort.base.nm_so;
567 soisdisconnected(so);
574 lwkt_replymsg(&msg->abort.base.lmsg, error);
578 udp6_attach(netmsg_t msg)
580 struct socket *so = msg->attach.base.nm_so;
581 struct pru_attach_info *ai = msg->attach.nm_ai;
591 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
592 error = soreserve(so, udp_sendspace, udp_recvspace,
598 error = in_pcballoc(so, &udbinfo[0]);
602 inp = (struct inpcb *)so->so_pcb;
603 inp->in6p_hops = -1; /* use kernel default */
604 inp->in6p_cksum = -1; /* just to be sure */
607 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
608 * because the socket may be bound to an IPv6 wildcard address,
609 * which may match an IPv4-mapped IPv6 address.
611 inp->inp_ip_ttl = ip_defttl;
614 lwkt_replymsg(&msg->attach.base.lmsg, error);
618 udp6_bind(netmsg_t msg)
620 struct socket *so =msg->bind.base.nm_so;
621 struct sockaddr *nam = msg->bind.nm_nam;
622 struct thread *td = msg->bind.nm_td;
623 struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
633 error = in6_pcbbind(inp, nam, td);
635 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
636 inp->inp_flags |= INP_WASBOUND_NOTANY;
637 in_pcbinswildcardhash(inp);
640 lwkt_replymsg(&msg->bind.base.lmsg, error);
644 udp6_connect(netmsg_t msg)
646 struct socket *so = msg->connect.base.nm_so;
647 struct sockaddr *nam = msg->connect.nm_nam;
648 struct thread *td = msg->connect.nm_td;
649 struct sockaddr_in6 *sin6_p;
659 sin6_p = (struct sockaddr_in6 *)nam;
660 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
661 error = EADDRNOTAVAIL;
665 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
669 if (inp->inp_flags & INP_WILDCARD)
670 in_pcbremwildcardhash(inp);
671 if (!prison_remote_ip(td, nam)) {
672 error = EAFNOSUPPORT; /* IPv4 only jail */
675 error = in6_pcbconnect(inp, nam, td);
678 } else if (error == EAFNOSUPPORT) { /* connection dissolved */
680 * Follow traditional BSD behavior and retain
681 * the local port binding. But, fix the old misbehavior
682 * of overwriting any previously bound local address.
684 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
685 inp->in6p_laddr = kin6addr_any;
686 in_pcbinswildcardhash(inp);
689 lwkt_replymsg(&msg->connect.base.lmsg, error);
693 udp6_detach(netmsg_t msg)
695 struct socket *so = msg->detach.base.nm_so;
706 lwkt_replymsg(&msg->detach.base.lmsg, error);
710 udp6_disconnect(netmsg_t msg)
712 struct socket *so = msg->disconnect.base.nm_so;
722 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
725 in6_pcbdisconnect(inp);
726 soclrstate(so, SS_ISCONNECTED); /* XXX */
730 lwkt_replymsg(&msg->disconnect.base.lmsg, error);
734 udp6_send(netmsg_t msg)
736 struct socket *so = msg->send.base.nm_so;
737 struct mbuf *m = msg->send.nm_m;
738 struct sockaddr *addr = msg->send.nm_addr;
739 struct mbuf *control = msg->send.nm_control;
740 struct thread *td = msg->send.nm_td;
751 struct sockaddr_in6 *sin6;
753 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
757 if (addr->sa_family != AF_INET6) {
758 error = EAFNOSUPPORT;
762 sin6 = (struct sockaddr_in6 *)addr;
763 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
764 error = EADDRNOTAVAIL;
769 error = udp6_output(inp, m, addr, control, td);
770 lwkt_replymsg(&msg->send.base.lmsg, error);
774 lwkt_replymsg(&msg->send.base.lmsg, error);
777 struct pr_usrreqs udp6_usrreqs = {
778 .pru_abort = udp6_abort,
779 .pru_accept = pr_generic_notsupp,
780 .pru_attach = udp6_attach,
781 .pru_bind = udp6_bind,
782 .pru_connect = udp6_connect,
783 .pru_connect2 = pr_generic_notsupp,
784 .pru_control = in6_control_dispatch,
785 .pru_detach = udp6_detach,
786 .pru_disconnect = udp6_disconnect,
787 .pru_listen = pr_generic_notsupp,
788 .pru_peeraddr = in6_setpeeraddr_dispatch,
789 .pru_rcvd = pr_generic_notsupp,
790 .pru_rcvoob = pr_generic_notsupp,
791 .pru_send = udp6_send,
792 .pru_sense = pru_sense_null,
793 .pru_shutdown = udp_shutdown,
794 .pru_sockaddr = in6_setsockaddr_dispatch,
795 .pru_sosend = sosend,
796 .pru_soreceive = soreceive