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"
67 #include <sys/param.h>
68 #include <sys/kernel.h>
70 #include <sys/protosw.h>
71 #include <sys/socket.h>
72 #include <sys/socketvar.h>
73 #include <sys/sysctl.h>
74 #include <sys/errno.h>
76 #include <sys/systm.h>
77 #include <sys/syslog.h>
81 #include <sys/thread2.h>
82 #include <sys/socketvar2.h>
83 #include <sys/msgport2.h>
86 #include <net/route.h>
87 #include <net/if_types.h>
88 #include <net/netisr2.h>
90 #include <netinet/in.h>
91 #include <netinet/in_systm.h>
92 #include <netinet/ip.h>
93 #include <netinet/in_pcb.h>
94 #include <netinet/in_var.h>
95 #include <netinet/ip_var.h>
96 #include <netinet/udp.h>
97 #include <netinet/udp_var.h>
98 #include <netinet/ip6.h>
99 #include <netinet6/ip6_var.h>
100 #include <netinet6/in6_pcb.h>
101 #include <netinet/icmp6.h>
102 #include <netinet6/udp6_var.h>
103 #include <netinet6/ip6protosw.h>
106 * UDP protocol inplementation.
107 * Per RFC 768, August, 1980.
110 extern struct protosw inetsw[];
111 static int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *);
114 in6_mcmatch(struct inpcb *in6p, struct in6_addr *ia6, struct ifnet *ifp)
116 struct ip6_moptions *im6o = in6p->in6p_moptions;
117 struct in6_multi_mship *imm;
122 for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
123 imm = imm->i6mm_chain.le_next) {
125 imm->i6mm_maddr->in6m_ifp == ifp) &&
126 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
134 udp6_input(struct mbuf **mp, int *offp, int proto)
136 struct mbuf *m = *mp;
140 struct mbuf *opts = NULL;
143 struct sockaddr_in6 udp_in6;
145 struct inpcbinfo *pcbinfo = &udbinfo[0];
147 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
149 ip6 = mtod(m, struct ip6_hdr *);
151 udp_stat.udps_ipackets++;
153 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
154 uh = (struct udphdr *)((caddr_t)ip6 + off);
155 ulen = ntohs((u_short)uh->uh_ulen);
158 udp_stat.udps_badlen++;
163 * Checksum extended UDP header and data.
166 udp_stat.udps_nosum++;
167 else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
168 udp_stat.udps_badsum++;
172 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
173 struct inpcb *last, *marker;
176 * Deliver a multicast datagram to all sockets
177 * for which the local and remote addresses and ports match
178 * those of the incoming datagram. This allows more than
179 * one process to receive multicasts on the same port.
180 * (This really ought to be done for unicast datagrams as
181 * well, but that would cause problems with existing
182 * applications that open both address-specific sockets and
183 * a wildcard socket listening to the same port -- they would
184 * end up receiving duplicates of every unicast datagram.
185 * Those applications open the multiple sockets to overcome an
186 * inadequacy of the UDP socket interface, but for backwards
187 * compatibility we avoid the problem here rather than
188 * fixing the interface. Maybe 4.5BSD will remedy this?)
192 * In a case that laddr should be set to the link-local
193 * address (this happens in RIPng), the multicast address
194 * specified in the received packet does not match with
195 * laddr. To cure this situation, the matching is relaxed
196 * if the receiving interface is the same as one specified
197 * in the socket and if the destination multicast address
198 * matches one of the multicast groups specified in the socket.
202 * Construct sockaddr format source address.
204 init_sin6(&udp_in6, m); /* general init */
205 udp_in6.sin6_port = uh->uh_sport;
207 * KAME note: traditionally we dropped udpiphdr from mbuf here.
211 * Locate pcb(s) for datagram.
212 * (Algorithm copied from raw_intr().)
216 marker = in_pcbmarker();
218 GET_PCBINFO_TOKEN(pcbinfo);
220 LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
221 while ((in6p = LIST_NEXT(marker, inp_list)) != NULL) {
222 LIST_REMOVE(marker, inp_list);
223 LIST_INSERT_AFTER(in6p, marker, inp_list);
225 if (in6p->inp_flags & INP_PLACEMARKER)
227 if (!INP_ISIPV6(in6p))
229 if (in6p->in6p_lport != uh->uh_dport)
231 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
232 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
234 !in6_mcmatch(in6p, &ip6->ip6_dst,
238 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
239 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
241 in6p->in6p_fport != uh->uh_sport)
248 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
251 * m_copy(m, offset, ...) above.
252 * ssb_appendaddr() expects M_PKTHDR,
253 * and m_copy() will copy M_PKTHDR
254 * only if offset is 0.
256 so = last->in6p_socket;
257 if ((last->in6p_flags & IN6P_CONTROLOPTS) ||
258 (so->so_options & SO_TIMESTAMP)) {
259 ip6_savecontrol(last, &opts,
262 m_adj(n, off + sizeof(struct udphdr));
263 lwkt_gettoken(&so->so_rcv.ssb_token);
264 if (ssb_appendaddr(&so->so_rcv,
265 (struct sockaddr *)&udp_in6,
270 udp_stat.udps_fullsock++;
274 lwkt_reltoken(&so->so_rcv.ssb_token);
280 * Don't look for additional matches if this one does
281 * not have either the SO_REUSEPORT or SO_REUSEADDR
282 * socket options set. This heuristic avoids searching
283 * through all pcbs in the common case of a non-shared
284 * port. It assumes that an application will never
285 * clear these options after setting them.
287 if ((last->in6p_socket->so_options &
288 (SO_REUSEPORT | SO_REUSEADDR)) == 0)
291 LIST_REMOVE(marker, inp_list);
293 REL_PCBINFO_TOKEN(pcbinfo);
297 * No matching pcb found; discard datagram.
298 * (No need to send an ICMP Port Unreachable
299 * for a broadcast or multicast datgram.)
301 udp_stat.udps_noport++;
302 udp_stat.udps_noportmcast++;
305 if (last->in6p_flags & IN6P_CONTROLOPTS
306 || last->in6p_socket->so_options & SO_TIMESTAMP)
307 ip6_savecontrol(last, &opts, ip6, m);
309 m_adj(m, off + sizeof(struct udphdr));
310 so = last->in6p_socket;
311 lwkt_gettoken(&so->so_rcv.ssb_token);
312 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6,
314 udp_stat.udps_fullsock++;
315 lwkt_reltoken(&so->so_rcv.ssb_token);
319 lwkt_reltoken(&so->so_rcv.ssb_token);
323 * Locate pcb for datagram.
325 in6p = in6_pcblookup_hash(pcbinfo, &ip6->ip6_src, uh->uh_sport,
326 &ip6->ip6_dst, uh->uh_dport, 1,
330 char buf[INET6_ADDRSTRLEN];
332 strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
334 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
335 buf, ntohs(uh->uh_dport),
336 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
338 udp_stat.udps_noport++;
339 if (m->m_flags & M_MCAST) {
340 kprintf("UDP6: M_MCAST is set in a unicast packet.\n");
341 udp_stat.udps_noportmcast++;
344 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
349 * Construct sockaddr format source address.
350 * Stuff source address and datagram in user buffer.
352 init_sin6(&udp_in6, m); /* general init */
353 udp_in6.sin6_port = uh->uh_sport;
354 if (in6p->in6p_flags & IN6P_CONTROLOPTS
355 || in6p->in6p_socket->so_options & SO_TIMESTAMP)
356 ip6_savecontrol(in6p, &opts, ip6, m);
357 m_adj(m, off + sizeof(struct udphdr));
358 so = in6p->in6p_socket;
359 lwkt_gettoken(&so->so_rcv.ssb_token);
360 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6,
362 udp_stat.udps_fullsock++;
363 lwkt_reltoken(&so->so_rcv.ssb_token);
367 lwkt_reltoken(&so->so_rcv.ssb_token);
378 udp6_ctlinput(netmsg_t msg)
380 int cmd = msg->ctlinput.nm_cmd;
381 struct sockaddr *sa = msg->ctlinput.nm_arg;
382 void *d = msg->ctlinput.nm_extra;
387 struct ip6ctlparam *ip6cp = NULL;
388 const struct sockaddr_in6 *sa6_src = NULL;
389 inp_notify_t notify = udp_notify;
390 struct udp_portonly {
395 if (sa->sa_family != AF_INET6 ||
396 sa->sa_len != sizeof(struct sockaddr_in6))
399 if ((unsigned)cmd >= PRC_NCMDS)
401 if (PRC_IS_REDIRECT(cmd))
402 notify = in6_rtchange, d = NULL;
403 else if (cmd == PRC_HOSTDEAD)
405 else if (inet6ctlerrmap[cmd] == 0)
408 /* if the parameter is from icmp6, decode it. */
410 ip6cp = (struct ip6ctlparam *)d;
412 ip6 = ip6cp->ip6c_ip6;
413 off = ip6cp->ip6c_off;
414 sa6_src = ip6cp->ip6c_src;
423 * XXX: We assume that when IPV6 is non NULL,
424 * M and OFF are valid.
427 /* check if we can safely examine src and dst ports */
428 if (m->m_pkthdr.len < off + sizeof(*uhp))
431 bzero(&uh, sizeof(uh));
432 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
434 in6_pcbnotify(&udbinfo[0], sa, uh.uh_dport,
435 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport,
438 in6_pcbnotify(&udbinfo[0], sa, 0,
439 (const struct sockaddr *)sa6_src, 0,
443 lwkt_replymsg(&msg->ctlinput.base.lmsg, 0);
447 udp6_getcred(SYSCTL_HANDLER_ARGS)
449 struct sockaddr_in6 addrs[2];
453 error = priv_check(req->td, PRIV_ROOT);
457 if (req->newlen != sizeof(addrs))
459 if (req->oldlen != sizeof(struct ucred))
461 error = SYSCTL_IN(req, addrs, sizeof(addrs));
465 inp = in6_pcblookup_hash(&udbinfo[0], &addrs[1].sin6_addr,
467 &addrs[0].sin6_addr, addrs[0].sin6_port,
469 if (!inp || !inp->inp_socket) {
473 error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
474 sizeof(struct ucred));
481 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
483 udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
486 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
487 * will sofree() it when we return.
490 udp6_abort(netmsg_t msg)
492 struct socket *so = msg->abort.base.nm_so;
498 soisdisconnected(so);
505 lwkt_replymsg(&msg->abort.base.lmsg, error);
509 udp6_attach(netmsg_t msg)
511 struct socket *so = msg->attach.base.nm_so;
512 struct pru_attach_info *ai = msg->attach.nm_ai;
522 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
523 error = soreserve(so, udp_sendspace, udp_recvspace,
529 error = in_pcballoc(so, &udbinfo[0]);
533 inp = (struct inpcb *)so->so_pcb;
534 inp->in6p_hops = -1; /* use kernel default */
535 inp->in6p_cksum = -1; /* just to be sure */
538 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
539 * because the socket may be bound to an IPv6 wildcard address,
540 * which may match an IPv4-mapped IPv6 address.
542 inp->inp_ip_ttl = ip_defttl;
545 lwkt_replymsg(&msg->attach.base.lmsg, error);
549 udp6_bind(netmsg_t msg)
551 struct socket *so =msg->bind.base.nm_so;
552 struct sockaddr *nam = msg->bind.nm_nam;
553 struct thread *td = msg->bind.nm_td;
554 struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
564 error = in6_pcbbind(inp, nam, td);
566 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
567 inp->inp_flags |= INP_WASBOUND_NOTANY;
568 in_pcbinswildcardhash(inp);
571 lwkt_replymsg(&msg->bind.base.lmsg, error);
575 udp6_connect(netmsg_t msg)
577 struct socket *so = msg->connect.base.nm_so;
578 struct sockaddr *nam = msg->connect.nm_nam;
579 struct thread *td = msg->connect.nm_td;
580 struct sockaddr_in6 *sin6_p;
590 sin6_p = (struct sockaddr_in6 *)nam;
591 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
592 error = EADDRNOTAVAIL;
596 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
600 if (inp->inp_flags & INP_WILDCARD)
601 in_pcbremwildcardhash(inp);
602 if (!prison_remote_ip(td, nam)) {
603 error = EAFNOSUPPORT; /* IPv4 only jail */
606 error = in6_pcbconnect(inp, nam, td);
609 } else if (error == EAFNOSUPPORT) { /* connection dissolved */
611 * Follow traditional BSD behavior and retain
612 * the local port binding. But, fix the old misbehavior
613 * of overwriting any previously bound local address.
615 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
616 inp->in6p_laddr = kin6addr_any;
617 in_pcbinswildcardhash(inp);
620 lwkt_replymsg(&msg->connect.base.lmsg, error);
624 udp6_detach(netmsg_t msg)
626 struct socket *so = msg->detach.base.nm_so;
637 lwkt_replymsg(&msg->detach.base.lmsg, error);
641 udp6_disconnect(netmsg_t msg)
643 struct socket *so = msg->disconnect.base.nm_so;
653 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
656 in6_pcbdisconnect(inp);
657 soclrstate(so, SS_ISCONNECTED); /* XXX */
661 lwkt_replymsg(&msg->disconnect.base.lmsg, error);
665 udp6_send(netmsg_t msg)
667 struct socket *so = msg->send.base.nm_so;
668 struct mbuf *m = msg->send.nm_m;
669 struct sockaddr *addr = msg->send.nm_addr;
670 struct mbuf *control = msg->send.nm_control;
671 struct thread *td = msg->send.nm_td;
682 struct sockaddr_in6 *sin6;
684 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
688 if (addr->sa_family != AF_INET6) {
689 error = EAFNOSUPPORT;
693 sin6 = (struct sockaddr_in6 *)addr;
694 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
695 error = EADDRNOTAVAIL;
700 error = udp6_output(inp, m, addr, control, td);
701 lwkt_replymsg(&msg->send.base.lmsg, error);
705 lwkt_replymsg(&msg->send.base.lmsg, error);
708 struct pr_usrreqs udp6_usrreqs = {
709 .pru_abort = udp6_abort,
710 .pru_accept = pr_generic_notsupp,
711 .pru_attach = udp6_attach,
712 .pru_bind = udp6_bind,
713 .pru_connect = udp6_connect,
714 .pru_connect2 = pr_generic_notsupp,
715 .pru_control = in6_control_dispatch,
716 .pru_detach = udp6_detach,
717 .pru_disconnect = udp6_disconnect,
718 .pru_listen = pr_generic_notsupp,
719 .pru_peeraddr = in6_setpeeraddr_dispatch,
720 .pru_rcvd = pr_generic_notsupp,
721 .pru_rcvoob = pr_generic_notsupp,
722 .pru_send = udp6_send,
723 .pru_sense = pru_sense_null,
724 .pru_shutdown = udp_shutdown,
725 .pru_sockaddr = in6_setsockaddr_dispatch,
726 .pru_sosend = sosend,
727 .pru_soreceive = soreceive