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>
69 #include <sys/malloc.h> /* for M_NOWAIT, XXX legacy m_copy() */
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>
83 #include <sys/thread2.h>
84 #include <sys/socketvar2.h>
85 #include <sys/msgport2.h>
88 #include <net/route.h>
89 #include <net/if_types.h>
90 #include <net/netisr2.h>
92 #include <netinet/in.h>
93 #include <netinet/in_systm.h>
94 #include <netinet/ip.h>
95 #include <netinet/in_pcb.h>
96 #include <netinet/in_var.h>
97 #include <netinet/ip_var.h>
98 #include <netinet/udp.h>
99 #include <netinet/udp_var.h>
100 #include <netinet/ip6.h>
101 #include <netinet6/ip6_var.h>
102 #include <netinet6/in6_pcb.h>
103 #include <netinet/icmp6.h>
104 #include <netinet6/udp6_var.h>
105 #include <netinet6/ip6protosw.h>
108 * UDP protocol inplementation.
109 * Per RFC 768, August, 1980.
112 extern struct protosw inetsw[];
113 static int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *);
116 in6_mcmatch(struct inpcb *in6p, struct in6_addr *ia6, struct ifnet *ifp)
118 struct ip6_moptions *im6o = in6p->in6p_moptions;
119 struct in6_multi_mship *imm;
124 for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
125 imm = imm->i6mm_chain.le_next) {
127 imm->i6mm_maddr->in6m_ifp == ifp) &&
128 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
136 udp6_input(struct mbuf **mp, int *offp, int proto)
138 struct mbuf *m = *mp;
142 struct mbuf *opts = NULL;
145 struct sockaddr_in6 udp_in6;
147 struct inpcbinfo *pcbinfo = &udbinfo[0];
149 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
151 ip6 = mtod(m, struct ip6_hdr *);
153 udp_stat.udps_ipackets++;
155 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
156 uh = (struct udphdr *)((caddr_t)ip6 + off);
157 ulen = ntohs((u_short)uh->uh_ulen);
160 udp_stat.udps_badlen++;
165 * Checksum extended UDP header and data.
168 udp_stat.udps_nosum++;
169 else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
170 udp_stat.udps_badsum++;
174 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
175 struct inpcb *last, *marker;
178 * Deliver a multicast datagram to all sockets
179 * for which the local and remote addresses and ports match
180 * those of the incoming datagram. This allows more than
181 * one process to receive multicasts on the same port.
182 * (This really ought to be done for unicast datagrams as
183 * well, but that would cause problems with existing
184 * applications that open both address-specific sockets and
185 * a wildcard socket listening to the same port -- they would
186 * end up receiving duplicates of every unicast datagram.
187 * Those applications open the multiple sockets to overcome an
188 * inadequacy of the UDP socket interface, but for backwards
189 * compatibility we avoid the problem here rather than
190 * fixing the interface. Maybe 4.5BSD will remedy this?)
194 * In a case that laddr should be set to the link-local
195 * address (this happens in RIPng), the multicast address
196 * specified in the received packet does not match with
197 * laddr. To cure this situation, the matching is relaxed
198 * if the receiving interface is the same as one specified
199 * in the socket and if the destination multicast address
200 * matches one of the multicast groups specified in the socket.
204 * Construct sockaddr format source address.
206 init_sin6(&udp_in6, m); /* general init */
207 udp_in6.sin6_port = uh->uh_sport;
209 * KAME note: traditionally we dropped udpiphdr from mbuf here.
213 * Locate pcb(s) for datagram.
214 * (Algorithm copied from raw_intr().)
218 marker = in_pcbmarker();
220 GET_PCBINFO_TOKEN(pcbinfo);
222 LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
223 while ((in6p = LIST_NEXT(marker, inp_list)) != NULL) {
224 LIST_REMOVE(marker, inp_list);
225 LIST_INSERT_AFTER(in6p, marker, inp_list);
227 if (in6p->inp_flags & INP_PLACEMARKER)
229 if (!INP_ISIPV6(in6p))
231 if (in6p->in6p_lport != uh->uh_dport)
233 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
234 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
236 !in6_mcmatch(in6p, &ip6->ip6_dst,
240 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
241 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
243 in6p->in6p_fport != uh->uh_sport)
250 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
253 * m_copy(m, offset, ...) above.
254 * ssb_appendaddr() expects M_PKTHDR,
255 * and m_copy() will copy M_PKTHDR
256 * only if offset is 0.
258 so = last->in6p_socket;
259 if ((last->in6p_flags & IN6P_CONTROLOPTS) ||
260 (so->so_options & SO_TIMESTAMP)) {
261 ip6_savecontrol(last, &opts,
264 m_adj(n, off + sizeof(struct udphdr));
265 lwkt_gettoken(&so->so_rcv.ssb_token);
266 if (ssb_appendaddr(&so->so_rcv,
267 (struct sockaddr *)&udp_in6,
272 udp_stat.udps_fullsock++;
277 lwkt_reltoken(&so->so_rcv.ssb_token);
283 * Don't look for additional matches if this one does
284 * not have either the SO_REUSEPORT or SO_REUSEADDR
285 * socket options set. This heuristic avoids searching
286 * through all pcbs in the common case of a non-shared
287 * port. It assumes that an application will never
288 * clear these options after setting them.
290 if ((last->in6p_socket->so_options &
291 (SO_REUSEPORT | SO_REUSEADDR)) == 0)
294 LIST_REMOVE(marker, inp_list);
296 REL_PCBINFO_TOKEN(pcbinfo);
300 * No matching pcb found; discard datagram.
301 * (No need to send an ICMP Port Unreachable
302 * for a broadcast or multicast datgram.)
304 udp_stat.udps_noport++;
305 udp_stat.udps_noportmcast++;
308 if (last->in6p_flags & IN6P_CONTROLOPTS
309 || last->in6p_socket->so_options & SO_TIMESTAMP)
310 ip6_savecontrol(last, &opts, ip6, m);
312 m_adj(m, off + sizeof(struct udphdr));
313 so = last->in6p_socket;
314 lwkt_gettoken(&so->so_rcv.ssb_token);
315 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6,
317 udp_stat.udps_fullsock++;
319 lwkt_reltoken(&so->so_rcv.ssb_token);
323 lwkt_reltoken(&so->so_rcv.ssb_token);
327 * Locate pcb for datagram.
329 in6p = in6_pcblookup_hash(pcbinfo, &ip6->ip6_src, uh->uh_sport,
330 &ip6->ip6_dst, uh->uh_dport, 1,
334 char buf[INET6_ADDRSTRLEN];
336 strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
338 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
339 buf, ntohs(uh->uh_dport),
340 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
342 udp_stat.udps_noport++;
343 if (m->m_flags & M_MCAST) {
344 kprintf("UDP6: M_MCAST is set in a unicast packet.\n");
345 udp_stat.udps_noportmcast++;
348 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
353 * Construct sockaddr format source address.
354 * Stuff source address and datagram in user buffer.
356 init_sin6(&udp_in6, m); /* general init */
357 udp_in6.sin6_port = uh->uh_sport;
358 if (in6p->in6p_flags & IN6P_CONTROLOPTS
359 || in6p->in6p_socket->so_options & SO_TIMESTAMP)
360 ip6_savecontrol(in6p, &opts, ip6, m);
361 m_adj(m, off + sizeof(struct udphdr));
362 so = in6p->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++;
368 lwkt_reltoken(&so->so_rcv.ssb_token);
372 lwkt_reltoken(&so->so_rcv.ssb_token);
383 udp6_ctlinput(netmsg_t msg)
385 int cmd = msg->ctlinput.nm_cmd;
386 struct sockaddr *sa = msg->ctlinput.nm_arg;
387 void *d = msg->ctlinput.nm_extra;
392 struct ip6ctlparam *ip6cp = NULL;
393 const struct sockaddr_in6 *sa6_src = NULL;
394 inp_notify_t notify = udp_notify;
395 struct udp_portonly {
400 if (sa->sa_family != AF_INET6 ||
401 sa->sa_len != sizeof(struct sockaddr_in6))
404 if ((unsigned)cmd >= PRC_NCMDS)
406 if (PRC_IS_REDIRECT(cmd))
407 notify = in6_rtchange, d = NULL;
408 else if (cmd == PRC_HOSTDEAD)
410 else if (inet6ctlerrmap[cmd] == 0)
413 /* if the parameter is from icmp6, decode it. */
415 ip6cp = (struct ip6ctlparam *)d;
417 ip6 = ip6cp->ip6c_ip6;
418 off = ip6cp->ip6c_off;
419 sa6_src = ip6cp->ip6c_src;
428 * XXX: We assume that when IPV6 is non NULL,
429 * M and OFF are valid.
432 /* check if we can safely examine src and dst ports */
433 if (m->m_pkthdr.len < off + sizeof(*uhp))
436 bzero(&uh, sizeof(uh));
437 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
439 in6_pcbnotify(&udbinfo[0], sa, uh.uh_dport,
440 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport,
443 in6_pcbnotify(&udbinfo[0], sa, 0,
444 (const struct sockaddr *)sa6_src, 0,
448 lwkt_replymsg(&msg->ctlinput.base.lmsg, 0);
452 udp6_getcred(SYSCTL_HANDLER_ARGS)
454 struct sockaddr_in6 addrs[2];
458 error = priv_check(req->td, PRIV_ROOT);
462 if (req->newlen != sizeof(addrs))
464 if (req->oldlen != sizeof(struct ucred))
466 error = SYSCTL_IN(req, addrs, sizeof(addrs));
470 inp = in6_pcblookup_hash(&udbinfo[0], &addrs[1].sin6_addr,
472 &addrs[0].sin6_addr, addrs[0].sin6_port,
474 if (!inp || !inp->inp_socket) {
478 error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
479 sizeof(struct ucred));
486 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
488 udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
491 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
492 * will sofree() it when we return.
495 udp6_abort(netmsg_t msg)
497 struct socket *so = msg->abort.base.nm_so;
503 soisdisconnected(so);
510 lwkt_replymsg(&msg->abort.base.lmsg, error);
514 udp6_attach(netmsg_t msg)
516 struct socket *so = msg->attach.base.nm_so;
517 struct pru_attach_info *ai = msg->attach.nm_ai;
527 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
528 error = soreserve(so, udp_sendspace, udp_recvspace,
534 error = in_pcballoc(so, &udbinfo[0]);
538 inp = (struct inpcb *)so->so_pcb;
539 inp->in6p_hops = -1; /* use kernel default */
540 inp->in6p_cksum = -1; /* just to be sure */
543 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
544 * because the socket may be bound to an IPv6 wildcard address,
545 * which may match an IPv4-mapped IPv6 address.
547 inp->inp_ip_ttl = ip_defttl;
550 lwkt_replymsg(&msg->attach.base.lmsg, error);
554 udp6_bind(netmsg_t msg)
556 struct socket *so =msg->bind.base.nm_so;
557 struct sockaddr *nam = msg->bind.nm_nam;
558 struct thread *td = msg->bind.nm_td;
559 struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
569 error = in6_pcbbind(inp, nam, td);
571 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
572 inp->inp_flags |= INP_WASBOUND_NOTANY;
573 in_pcbinswildcardhash(inp);
576 lwkt_replymsg(&msg->bind.base.lmsg, error);
580 udp6_connect(netmsg_t msg)
582 struct socket *so = msg->connect.base.nm_so;
583 struct sockaddr *nam = msg->connect.nm_nam;
584 struct thread *td = msg->connect.nm_td;
585 struct sockaddr_in6 *sin6_p;
595 sin6_p = (struct sockaddr_in6 *)nam;
596 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
597 error = EADDRNOTAVAIL;
601 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
605 if (inp->inp_flags & INP_WILDCARD)
606 in_pcbremwildcardhash(inp);
607 if (!prison_remote_ip(td, nam)) {
608 error = EAFNOSUPPORT; /* IPv4 only jail */
611 error = in6_pcbconnect(inp, nam, td);
614 } else if (error == EAFNOSUPPORT) { /* connection dissolved */
616 * Follow traditional BSD behavior and retain
617 * the local port binding. But, fix the old misbehavior
618 * of overwriting any previously bound local address.
620 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
621 inp->in6p_laddr = kin6addr_any;
622 in_pcbinswildcardhash(inp);
625 lwkt_replymsg(&msg->connect.base.lmsg, error);
629 udp6_detach(netmsg_t msg)
631 struct socket *so = msg->detach.base.nm_so;
642 lwkt_replymsg(&msg->detach.base.lmsg, error);
646 udp6_disconnect(netmsg_t msg)
648 struct socket *so = msg->disconnect.base.nm_so;
658 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
661 in6_pcbdisconnect(inp);
662 soclrstate(so, SS_ISCONNECTED); /* XXX */
666 lwkt_replymsg(&msg->disconnect.base.lmsg, error);
670 udp6_send(netmsg_t msg)
672 struct socket *so = msg->send.base.nm_so;
673 struct mbuf *m = msg->send.nm_m;
674 struct sockaddr *addr = msg->send.nm_addr;
675 struct mbuf *control = msg->send.nm_control;
676 struct thread *td = msg->send.nm_td;
687 struct sockaddr_in6 *sin6;
689 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
693 if (addr->sa_family != AF_INET6) {
694 error = EAFNOSUPPORT;
698 sin6 = (struct sockaddr_in6 *)addr;
699 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
700 error = EADDRNOTAVAIL;
705 error = udp6_output(inp, m, addr, control, td);
706 lwkt_replymsg(&msg->send.base.lmsg, error);
710 lwkt_replymsg(&msg->send.base.lmsg, error);
713 struct pr_usrreqs udp6_usrreqs = {
714 .pru_abort = udp6_abort,
715 .pru_accept = pr_generic_notsupp,
716 .pru_attach = udp6_attach,
717 .pru_bind = udp6_bind,
718 .pru_connect = udp6_connect,
719 .pru_connect2 = pr_generic_notsupp,
720 .pru_control = in6_control_dispatch,
721 .pru_detach = udp6_detach,
722 .pru_disconnect = udp6_disconnect,
723 .pru_listen = pr_generic_notsupp,
724 .pru_peeraddr = in6_setpeeraddr_dispatch,
725 .pru_rcvd = pr_generic_notsupp,
726 .pru_rcvoob = pr_generic_notsupp,
727 .pru_send = udp6_send,
728 .pru_sense = pru_sense_null,
729 .pru_shutdown = udp_shutdown,
730 .pru_sockaddr = in6_setsockaddr_dispatch,
731 .pru_sosend = sosend,
732 .pru_soreceive = soreceive