31 */
32
33#include "opt_ipsec.h"
34#include "opt_inet6.h"
35#include "opt_mac.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/domain.h>
40#include <sys/jail.h>
41#include <sys/kernel.h>
42#include <sys/lock.h>
43#include <sys/mac.h>
44#include <sys/malloc.h>
45#include <sys/mbuf.h>
46#include <sys/proc.h>
47#include <sys/protosw.h>
48#include <sys/signalvar.h>
49#include <sys/socket.h>
50#include <sys/socketvar.h>
51#include <sys/sx.h>
52#include <sys/sysctl.h>
53#include <sys/syslog.h>
54
55#include <vm/uma.h>
56
57#include <net/if.h>
58#include <net/route.h>
59
60#include <netinet/in.h>
61#include <netinet/in_systm.h>
62#include <netinet/in_pcb.h>
63#include <netinet/in_var.h>
64#include <netinet/ip.h>
65#ifdef INET6
66#include <netinet/ip6.h>
67#endif
68#include <netinet/ip_icmp.h>
69#include <netinet/icmp_var.h>
70#include <netinet/ip_var.h>
71#ifdef INET6
72#include <netinet6/ip6_var.h>
73#endif
74#include <netinet/udp.h>
75#include <netinet/udp_var.h>
76
77#ifdef FAST_IPSEC
78#include <netipsec/ipsec.h>
79#endif /*FAST_IPSEC*/
80
81#ifdef IPSEC
82#include <netinet6/ipsec.h>
83#endif /*IPSEC*/
84
85#include <machine/in_cksum.h>
86
87/*
88 * UDP protocol implementation.
89 * Per RFC 768, August, 1980.
90 */
91#ifndef COMPAT_42
92static int udpcksum = 1;
93#else
94static int udpcksum = 0; /* XXX */
95#endif
96SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
97 &udpcksum, 0, "");
98
99int log_in_vain = 0;
100SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
101 &log_in_vain, 0, "Log all incoming UDP packets");
102
103static int blackhole = 0;
104SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW,
105 &blackhole, 0, "Do not send port unreachables for refused connects");
106
107static int strict_mcast_mship = 0;
108SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW,
109 &strict_mcast_mship, 0, "Only send multicast to member sockets");
110
111struct inpcbhead udb; /* from udp_var.h */
112#define udb6 udb /* for KAME src sync over BSD*'s */
113struct inpcbinfo udbinfo;
114
115#ifndef UDBHASHSIZE
116#define UDBHASHSIZE 16
117#endif
118
119struct udpstat udpstat; /* from udp_var.h */
120SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW,
121 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
122
123static void udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n,
124 int off, struct sockaddr_in *udp_in);
125
126static int udp_detach(struct socket *so);
127static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
128 struct mbuf *, struct thread *);
129
130void
131udp_init()
132{
133 INP_INFO_LOCK_INIT(&udbinfo, "udp");
134 LIST_INIT(&udb);
135 udbinfo.listhead = &udb;
136 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask);
137 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB,
138 &udbinfo.porthashmask);
139 udbinfo.ipi_zone = uma_zcreate("udpcb", sizeof(struct inpcb), NULL,
140 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
141 uma_zone_set_max(udbinfo.ipi_zone, maxsockets);
142}
143
144void
145udp_input(m, off)
146 register struct mbuf *m;
147 int off;
148{
149 int iphlen = off;
150 register struct ip *ip;
151 register struct udphdr *uh;
152 register struct inpcb *inp;
153 struct mbuf *opts = 0;
154 int len;
155 struct ip save_ip;
156 struct sockaddr_in udp_in;
157
158 udpstat.udps_ipackets++;
159
160 /*
161 * Strip IP options, if any; should skip this,
162 * make available to user, and use on returned packets,
163 * but we don't yet have a way to check the checksum
164 * with options still present.
165 */
166 if (iphlen > sizeof (struct ip)) {
167 ip_stripoptions(m, (struct mbuf *)0);
168 iphlen = sizeof(struct ip);
169 }
170
171 /*
172 * Get IP and UDP header together in first mbuf.
173 */
174 ip = mtod(m, struct ip *);
175 if (m->m_len < iphlen + sizeof(struct udphdr)) {
176 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
177 udpstat.udps_hdrops++;
178 return;
179 }
180 ip = mtod(m, struct ip *);
181 }
182 uh = (struct udphdr *)((caddr_t)ip + iphlen);
183
184 /* destination port of 0 is illegal, based on RFC768. */
185 if (uh->uh_dport == 0)
186 goto badunlocked;
187
188 /*
189 * Construct sockaddr format source address.
190 * Stuff source address and datagram in user buffer.
191 */
192 bzero(&udp_in, sizeof(udp_in));
193 udp_in.sin_len = sizeof(udp_in);
194 udp_in.sin_family = AF_INET;
195 udp_in.sin_port = uh->uh_sport;
196 udp_in.sin_addr = ip->ip_src;
197
198 /*
199 * Make mbuf data length reflect UDP length.
200 * If not enough data to reflect UDP length, drop.
201 */
202 len = ntohs((u_short)uh->uh_ulen);
203 if (ip->ip_len != len) {
204 if (len > ip->ip_len || len < sizeof(struct udphdr)) {
205 udpstat.udps_badlen++;
206 goto badunlocked;
207 }
208 m_adj(m, len - ip->ip_len);
209 /* ip->ip_len = len; */
210 }
211 /*
212 * Save a copy of the IP header in case we want restore it
213 * for sending an ICMP error message in response.
214 */
215 if (!blackhole)
216 save_ip = *ip;
217
218 /*
219 * Checksum extended UDP header and data.
220 */
221 if (uh->uh_sum) {
222 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
223 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
224 uh->uh_sum = m->m_pkthdr.csum_data;
225 else
226 uh->uh_sum = in_pseudo(ip->ip_src.s_addr,
227 ip->ip_dst.s_addr, htonl((u_short)len +
228 m->m_pkthdr.csum_data + IPPROTO_UDP));
229 uh->uh_sum ^= 0xffff;
230 } else {
231 char b[9];
232 bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
233 bzero(((struct ipovly *)ip)->ih_x1, 9);
234 ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
235 uh->uh_sum = in_cksum(m, len + sizeof (struct ip));
236 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
237 }
238 if (uh->uh_sum) {
239 udpstat.udps_badsum++;
240 m_freem(m);
241 return;
242 }
243 } else
244 udpstat.udps_nosum++;
245
246 INP_INFO_RLOCK(&udbinfo);
247
248 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
249 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
250 struct inpcb *last;
251 /*
252 * Deliver a multicast or broadcast datagram to *all* sockets
253 * for which the local and remote addresses and ports match
254 * those of the incoming datagram. This allows more than
255 * one process to receive multi/broadcasts on the same port.
256 * (This really ought to be done for unicast datagrams as
257 * well, but that would cause problems with existing
258 * applications that open both address-specific sockets and
259 * a wildcard socket listening to the same port -- they would
260 * end up receiving duplicates of every unicast datagram.
261 * Those applications open the multiple sockets to overcome an
262 * inadequacy of the UDP socket interface, but for backwards
263 * compatibility we avoid the problem here rather than
264 * fixing the interface. Maybe 4.5BSD will remedy this?)
265 */
266
267 /*
268 * Locate pcb(s) for datagram.
269 * (Algorithm copied from raw_intr().)
270 */
271 last = NULL;
272 LIST_FOREACH(inp, &udb, inp_list) {
273 if (inp->inp_lport != uh->uh_dport)
274 continue;
275#ifdef INET6
276 if ((inp->inp_vflag & INP_IPV4) == 0)
277 continue;
278#endif
279 if (inp->inp_laddr.s_addr != INADDR_ANY) {
280 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
281 continue;
282 }
283 if (inp->inp_faddr.s_addr != INADDR_ANY) {
284 if (inp->inp_faddr.s_addr !=
285 ip->ip_src.s_addr ||
286 inp->inp_fport != uh->uh_sport)
287 continue;
288 }
289 INP_LOCK(inp);
290
291 /*
292 * Check multicast packets to make sure they are only
293 * sent to sockets with multicast memberships for the
294 * packet's destination address and arrival interface
295 */
296#define MSHIP(_inp, n) ((_inp)->inp_moptions->imo_membership[(n)])
297#define NMSHIPS(_inp) ((_inp)->inp_moptions->imo_num_memberships)
298 if (strict_mcast_mship && inp->inp_moptions != NULL) {
299 int mship, foundmship = 0;
300
301 for (mship = 0; mship < NMSHIPS(inp); mship++) {
302 if (MSHIP(inp, mship)->inm_addr.s_addr
303 == ip->ip_dst.s_addr &&
304 MSHIP(inp, mship)->inm_ifp
305 == m->m_pkthdr.rcvif) {
306 foundmship = 1;
307 break;
308 }
309 }
310 if (foundmship == 0) {
311 INP_UNLOCK(inp);
312 continue;
313 }
314 }
315#undef NMSHIPS
316#undef MSHIP
317 if (last != NULL) {
318 struct mbuf *n;
319
320 n = m_copy(m, 0, M_COPYALL);
321 if (n != NULL)
322 udp_append(last, ip, n,
323 iphlen +
324 sizeof(struct udphdr),
325 &udp_in);
326 INP_UNLOCK(last);
327 }
328 last = inp;
329 /*
330 * Don't look for additional matches if this one does
331 * not have either the SO_REUSEPORT or SO_REUSEADDR
332 * socket options set. This heuristic avoids searching
333 * through all pcbs in the common case of a non-shared
334 * port. It * assumes that an application will never
335 * clear these options after setting them.
336 */
337 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0)
338 break;
339 }
340
341 if (last == NULL) {
342 /*
343 * No matching pcb found; discard datagram.
344 * (No need to send an ICMP Port Unreachable
345 * for a broadcast or multicast datgram.)
346 */
347 udpstat.udps_noportbcast++;
348 goto badheadlocked;
349 }
350 udp_append(last, ip, m, iphlen + sizeof(struct udphdr),
351 &udp_in);
352 INP_UNLOCK(last);
353 INP_INFO_RUNLOCK(&udbinfo);
354 return;
355 }
356 /*
357 * Locate pcb for datagram.
358 */
359 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport,
360 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
361 if (inp == NULL) {
362 if (log_in_vain) {
363 char buf[4*sizeof "123"];
364
365 strcpy(buf, inet_ntoa(ip->ip_dst));
366 log(LOG_INFO,
367 "Connection attempt to UDP %s:%d from %s:%d\n",
368 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
369 ntohs(uh->uh_sport));
370 }
371 udpstat.udps_noport++;
372 if (m->m_flags & (M_BCAST | M_MCAST)) {
373 udpstat.udps_noportbcast++;
374 goto badheadlocked;
375 }
376 if (blackhole)
377 goto badheadlocked;
378 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
379 goto badheadlocked;
380 *ip = save_ip;
381 ip->ip_len += iphlen;
382 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
383 INP_INFO_RUNLOCK(&udbinfo);
384 return;
385 }
386 INP_LOCK(inp);
387 udp_append(inp, ip, m, iphlen + sizeof(struct udphdr), &udp_in);
388 INP_UNLOCK(inp);
389 INP_INFO_RUNLOCK(&udbinfo);
390 return;
391
392badheadlocked:
393 if (inp)
394 INP_UNLOCK(inp);
395 INP_INFO_RUNLOCK(&udbinfo);
396badunlocked:
397 m_freem(m);
398 if (opts)
399 m_freem(opts);
400 return;
401}
402
403/*
404 * Subroutine of udp_input(), which appends the provided mbuf chain to the
405 * passed pcb/socket. The caller must provide a sockaddr_in via udp_in that
406 * contains the source address. If the socket ends up being an IPv6 socket,
407 * udp_append() will convert to a sockaddr_in6 before passing the address
408 * into the socket code.
409 */
410static void
411udp_append(last, ip, n, off, udp_in)
412 struct inpcb *last;
413 struct ip *ip;
414 struct mbuf *n;
415 int off;
416 struct sockaddr_in *udp_in;
417{
418 struct sockaddr *append_sa;
419 struct socket *so;
420 struct mbuf *opts = 0;
421#ifdef INET6
422 struct sockaddr_in6 udp_in6;
423#endif
424
425 INP_LOCK_ASSERT(last);
426
427#if defined(IPSEC) || defined(FAST_IPSEC)
428 /* check AH/ESP integrity. */
429 if (ipsec4_in_reject(n, last)) {
430#ifdef IPSEC
431 ipsecstat.in_polvio++;
432#endif /*IPSEC*/
433 m_freem(n);
434 return;
435 }
436#endif /*IPSEC || FAST_IPSEC*/
437#ifdef MAC
438 if (mac_check_inpcb_deliver(last, n) != 0) {
439 m_freem(n);
440 return;
441 }
442#endif
443 if (last->inp_flags & INP_CONTROLOPTS ||
444 last->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
445#ifdef INET6
446 if (last->inp_vflag & INP_IPV6) {
447 int savedflags;
448
449 savedflags = last->inp_flags;
450 last->inp_flags &= ~INP_UNMAPPABLEOPTS;
451 ip6_savecontrol(last, n, &opts);
452 last->inp_flags = savedflags;
453 } else
454#endif
455 ip_savecontrol(last, &opts, ip, n);
456 }
457#ifdef INET6
458 if (last->inp_vflag & INP_IPV6) {
459 bzero(&udp_in6, sizeof(udp_in6));
460 udp_in6.sin6_len = sizeof(udp_in6);
461 udp_in6.sin6_family = AF_INET6;
462 in6_sin_2_v4mapsin6(udp_in, &udp_in6);
463 append_sa = (struct sockaddr *)&udp_in6;
464 } else
465#endif
466 append_sa = (struct sockaddr *)udp_in;
467 m_adj(n, off);
468
469 so = last->inp_socket;
470 SOCKBUF_LOCK(&so->so_rcv);
471 if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
472 m_freem(n);
473 if (opts)
474 m_freem(opts);
475 udpstat.udps_fullsock++;
476 SOCKBUF_UNLOCK(&so->so_rcv);
477 } else
478 sorwakeup_locked(so);
479}
480
481/*
482 * Notify a udp user of an asynchronous error;
483 * just wake up so that he can collect error status.
484 */
485struct inpcb *
486udp_notify(inp, errno)
487 register struct inpcb *inp;
488 int errno;
489{
490 inp->inp_socket->so_error = errno;
491 sorwakeup(inp->inp_socket);
492 sowwakeup(inp->inp_socket);
493 return inp;
494}
495
496void
497udp_ctlinput(cmd, sa, vip)
498 int cmd;
499 struct sockaddr *sa;
500 void *vip;
501{
502 struct ip *ip = vip;
503 struct udphdr *uh;
504 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
505 struct in_addr faddr;
506 struct inpcb *inp;
507 int s;
508
509 faddr = ((struct sockaddr_in *)sa)->sin_addr;
510 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
511 return;
512
513 /*
514 * Redirects don't need to be handled up here.
515 */
516 if (PRC_IS_REDIRECT(cmd))
517 return;
518 /*
519 * Hostdead is ugly because it goes linearly through all PCBs.
520 * XXX: We never get this from ICMP, otherwise it makes an
521 * excellent DoS attack on machines with many connections.
522 */
523 if (cmd == PRC_HOSTDEAD)
524 ip = 0;
525 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
526 return;
527 if (ip) {
528 s = splnet();
529 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
530 INP_INFO_RLOCK(&udbinfo);
531 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport,
532 ip->ip_src, uh->uh_sport, 0, NULL);
533 if (inp != NULL) {
534 INP_LOCK(inp);
535 if (inp->inp_socket != NULL) {
536 (*notify)(inp, inetctlerrmap[cmd]);
537 }
538 INP_UNLOCK(inp);
539 }
540 INP_INFO_RUNLOCK(&udbinfo);
541 splx(s);
542 } else
543 in_pcbnotifyall(&udbinfo, faddr, inetctlerrmap[cmd], notify);
544}
545
546static int
547udp_pcblist(SYSCTL_HANDLER_ARGS)
548{
549 int error, i, n, s;
550 struct inpcb *inp, **inp_list;
551 inp_gen_t gencnt;
552 struct xinpgen xig;
553
554 /*
555 * The process of preparing the TCB list is too time-consuming and
556 * resource-intensive to repeat twice on every request.
557 */
558 if (req->oldptr == 0) {
559 n = udbinfo.ipi_count;
560 req->oldidx = 2 * (sizeof xig)
561 + (n + n/8) * sizeof(struct xinpcb);
562 return 0;
563 }
564
565 if (req->newptr != 0)
566 return EPERM;
567
568 /*
569 * OK, now we're committed to doing something.
570 */
571 s = splnet();
572 INP_INFO_RLOCK(&udbinfo);
573 gencnt = udbinfo.ipi_gencnt;
574 n = udbinfo.ipi_count;
575 INP_INFO_RUNLOCK(&udbinfo);
576 splx(s);
577
578 error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
579 + n * sizeof(struct xinpcb));
580 if (error != 0)
581 return (error);
582
583 xig.xig_len = sizeof xig;
584 xig.xig_count = n;
585 xig.xig_gen = gencnt;
586 xig.xig_sogen = so_gencnt;
587 error = SYSCTL_OUT(req, &xig, sizeof xig);
588 if (error)
589 return error;
590
591 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
592 if (inp_list == 0)
593 return ENOMEM;
594
595 s = splnet();
596 INP_INFO_RLOCK(&udbinfo);
597 for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n;
598 inp = LIST_NEXT(inp, inp_list)) {
599 INP_LOCK(inp);
600 if (inp->inp_gencnt <= gencnt &&
601 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0)
602 inp_list[i++] = inp;
603 INP_UNLOCK(inp);
604 }
605 INP_INFO_RUNLOCK(&udbinfo);
606 splx(s);
607 n = i;
608
609 error = 0;
610 for (i = 0; i < n; i++) {
611 inp = inp_list[i];
612 if (inp->inp_gencnt <= gencnt) {
613 struct xinpcb xi;
614 xi.xi_len = sizeof xi;
615 /* XXX should avoid extra copy */
616 bcopy(inp, &xi.xi_inp, sizeof *inp);
617 if (inp->inp_socket)
618 sotoxsocket(inp->inp_socket, &xi.xi_socket);
619 xi.xi_inp.inp_gencnt = inp->inp_gencnt;
620 error = SYSCTL_OUT(req, &xi, sizeof xi);
621 }
622 }
623 if (!error) {
624 /*
625 * Give the user an updated idea of our state.
626 * If the generation differs from what we told
627 * her before, she knows that something happened
628 * while we were processing this request, and it
629 * might be necessary to retry.
630 */
631 s = splnet();
632 INP_INFO_RLOCK(&udbinfo);
633 xig.xig_gen = udbinfo.ipi_gencnt;
634 xig.xig_sogen = so_gencnt;
635 xig.xig_count = udbinfo.ipi_count;
636 INP_INFO_RUNLOCK(&udbinfo);
637 splx(s);
638 error = SYSCTL_OUT(req, &xig, sizeof xig);
639 }
640 free(inp_list, M_TEMP);
641 return error;
642}
643
644SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0,
645 udp_pcblist, "S,xinpcb", "List of active UDP sockets");
646
647static int
648udp_getcred(SYSCTL_HANDLER_ARGS)
649{
650 struct xucred xuc;
651 struct sockaddr_in addrs[2];
652 struct inpcb *inp;
653 int error, s;
654
655 error = suser_cred(req->td->td_ucred, SUSER_ALLOWJAIL);
656 if (error)
657 return (error);
658 error = SYSCTL_IN(req, addrs, sizeof(addrs));
659 if (error)
660 return (error);
661 s = splnet();
662 INP_INFO_RLOCK(&udbinfo);
663 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
664 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL);
665 if (inp == NULL || inp->inp_socket == NULL) {
666 error = ENOENT;
667 goto out;
668 }
669 error = cr_canseesocket(req->td->td_ucred, inp->inp_socket);
670 if (error)
671 goto out;
672 cru2x(inp->inp_socket->so_cred, &xuc);
673out:
674 INP_INFO_RUNLOCK(&udbinfo);
675 splx(s);
676 if (error == 0)
677 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
678 return (error);
679}
680
681SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
682 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
683 udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
684
685static int
686udp_output(inp, m, addr, control, td)
687 register struct inpcb *inp;
688 struct mbuf *m;
689 struct sockaddr *addr;
690 struct mbuf *control;
691 struct thread *td;
692{
693 register struct udpiphdr *ui;
694 register int len = m->m_pkthdr.len;
695 struct in_addr faddr, laddr;
696 struct cmsghdr *cm;
697 struct sockaddr_in *sin, src;
698 int error = 0;
699 int ipflags;
700 u_short fport, lport;
701 int unlock_udbinfo;
702
703 /*
704 * udp_output() may need to temporarily bind or connect the current
705 * inpcb. As such, we don't know up front what inpcb locks we will
706 * need. Do any work to decide what is needed up front before
707 * acquiring locks.
708 */
709 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
710 if (control)
711 m_freem(control);
712 m_freem(m);
713 return EMSGSIZE;
714 }
715
716 src.sin_addr.s_addr = INADDR_ANY;
717 if (control != NULL) {
718 /*
719 * XXX: Currently, we assume all the optional information
720 * is stored in a single mbuf.
721 */
722 if (control->m_next) {
723 m_freem(control);
724 m_freem(m);
725 return EINVAL;
726 }
727 for (; control->m_len > 0;
728 control->m_data += CMSG_ALIGN(cm->cmsg_len),
729 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
730 cm = mtod(control, struct cmsghdr *);
731 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0 ||
732 cm->cmsg_len > control->m_len) {
733 error = EINVAL;
734 break;
735 }
736 if (cm->cmsg_level != IPPROTO_IP)
737 continue;
738
739 switch (cm->cmsg_type) {
740 case IP_SENDSRCADDR:
741 if (cm->cmsg_len !=
742 CMSG_LEN(sizeof(struct in_addr))) {
743 error = EINVAL;
744 break;
745 }
746 bzero(&src, sizeof(src));
747 src.sin_family = AF_INET;
748 src.sin_len = sizeof(src);
749 src.sin_port = inp->inp_lport;
750 src.sin_addr = *(struct in_addr *)CMSG_DATA(cm);
751 break;
752 default:
753 error = ENOPROTOOPT;
754 break;
755 }
756 if (error)
757 break;
758 }
759 m_freem(control);
760 }
761 if (error) {
762 m_freem(m);
763 return error;
764 }
765
766 if (src.sin_addr.s_addr != INADDR_ANY ||
767 addr != NULL) {
768 INP_INFO_WLOCK(&udbinfo);
769 unlock_udbinfo = 1;
770 } else
771 unlock_udbinfo = 0;
772 INP_LOCK(inp);
773
774#ifdef MAC
775 mac_create_mbuf_from_inpcb(inp, m);
776#endif
777
778 laddr = inp->inp_laddr;
779 lport = inp->inp_lport;
780 if (src.sin_addr.s_addr != INADDR_ANY) {
781 if (lport == 0) {
782 error = EINVAL;
783 goto release;
784 }
785 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
786 &laddr.s_addr, &lport, td->td_ucred);
787 if (error)
788 goto release;
789 }
790
791 if (addr) {
792 sin = (struct sockaddr_in *)addr;
793 if (td && jailed(td->td_ucred))
794 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr);
795 if (inp->inp_faddr.s_addr != INADDR_ANY) {
796 error = EISCONN;
797 goto release;
798 }
799 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, &lport,
800 &faddr.s_addr, &fport, NULL, td->td_ucred);
801 if (error)
802 goto release;
803
804 /* Commit the local port if newly assigned. */
805 if (inp->inp_laddr.s_addr == INADDR_ANY &&
806 inp->inp_lport == 0) {
807 inp->inp_lport = lport;
808 if (in_pcbinshash(inp) != 0) {
809 inp->inp_lport = 0;
810 error = EAGAIN;
811 goto release;
812 }
813 inp->inp_flags |= INP_ANONPORT;
814 }
815 } else {
816 faddr = inp->inp_faddr;
817 fport = inp->inp_fport;
818 if (faddr.s_addr == INADDR_ANY) {
819 error = ENOTCONN;
820 goto release;
821 }
822 }
823
824 /*
825 * Calculate data length and get a mbuf for UDP, IP, and possible
826 * link-layer headers. Immediate slide the data pointer back forward
827 * since we won't use that space at this layer.
828 */
829 M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_DONTWAIT);
830 if (m == NULL) {
831 error = ENOBUFS;
832 goto release;
833 }
834 m->m_data += max_linkhdr;
835 m->m_len -= max_linkhdr;
836 m->m_pkthdr.len -= max_linkhdr;
837
838 /*
839 * Fill in mbuf with extended UDP header
840 * and addresses and length put into network format.
841 */
842 ui = mtod(m, struct udpiphdr *);
843 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */
844 ui->ui_pr = IPPROTO_UDP;
845 ui->ui_src = laddr;
846 ui->ui_dst = faddr;
847 ui->ui_sport = lport;
848 ui->ui_dport = fport;
849 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
850
851 ipflags = 0;
852 if (inp->inp_socket->so_options & SO_DONTROUTE)
853 ipflags |= IP_ROUTETOIF;
854 if (inp->inp_socket->so_options & SO_BROADCAST)
855 ipflags |= IP_ALLOWBROADCAST;
856 if (inp->inp_flags & INP_ONESBCAST)
857 ipflags |= IP_SENDONES;
858
859 /*
860 * Set up checksum and output datagram.
861 */
862 if (udpcksum) {
863 if (inp->inp_flags & INP_ONESBCAST)
864 faddr.s_addr = INADDR_BROADCAST;
865 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
866 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
867 m->m_pkthdr.csum_flags = CSUM_UDP;
868 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
869 } else {
870 ui->ui_sum = 0;
871 }
872 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
873 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */
874 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */
875 udpstat.udps_opackets++;
876
877 if (unlock_udbinfo)
878 INP_INFO_WUNLOCK(&udbinfo);
879 error = ip_output(m, inp->inp_options, NULL, ipflags,
880 inp->inp_moptions, inp);
881 INP_UNLOCK(inp);
882 return (error);
883
884release:
885 INP_UNLOCK(inp);
886 if (unlock_udbinfo)
887 INP_INFO_WUNLOCK(&udbinfo);
888 m_freem(m);
889 return (error);
890}
891
892u_long udp_sendspace = 9216; /* really max datagram size */
893 /* 40 1K datagrams */
894SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
895 &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
896
897u_long udp_recvspace = 40 * (1024 +
898#ifdef INET6
899 sizeof(struct sockaddr_in6)
900#else
901 sizeof(struct sockaddr_in)
902#endif
903 );
904SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
905 &udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
906
907static int
908udp_abort(struct socket *so)
909{
910 struct inpcb *inp;
911 int s;
912
913 INP_INFO_WLOCK(&udbinfo);
914 inp = sotoinpcb(so);
915 if (inp == 0) {
916 INP_INFO_WUNLOCK(&udbinfo);
917 return EINVAL; /* ??? possible? panic instead? */
918 }
919 INP_LOCK(inp);
920 soisdisconnected(so);
921 s = splnet();
922 in_pcbdetach(inp);
923 INP_INFO_WUNLOCK(&udbinfo);
924 splx(s);
925 return 0;
926}
927
928static int
929udp_attach(struct socket *so, int proto, struct thread *td)
930{
931 struct inpcb *inp;
932 int s, error;
933
934 INP_INFO_WLOCK(&udbinfo);
935 inp = sotoinpcb(so);
936 if (inp != 0) {
937 INP_INFO_WUNLOCK(&udbinfo);
938 return EINVAL;
939 }
940 error = soreserve(so, udp_sendspace, udp_recvspace);
941 if (error) {
942 INP_INFO_WUNLOCK(&udbinfo);
943 return error;
944 }
945 s = splnet();
946 error = in_pcballoc(so, &udbinfo, "udpinp");
947 splx(s);
948 if (error) {
949 INP_INFO_WUNLOCK(&udbinfo);
950 return error;
951 }
952
953 inp = (struct inpcb *)so->so_pcb;
954 INP_LOCK(inp);
955 INP_INFO_WUNLOCK(&udbinfo);
956 inp->inp_vflag |= INP_IPV4;
957 inp->inp_ip_ttl = ip_defttl;
958 INP_UNLOCK(inp);
959 return 0;
960}
961
962static int
963udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
964{
965 struct inpcb *inp;
966 int s, error;
967
968 INP_INFO_WLOCK(&udbinfo);
969 inp = sotoinpcb(so);
970 if (inp == 0) {
971 INP_INFO_WUNLOCK(&udbinfo);
972 return EINVAL;
973 }
974 INP_LOCK(inp);
975 s = splnet();
976 error = in_pcbbind(inp, nam, td->td_ucred);
977 splx(s);
978 INP_UNLOCK(inp);
979 INP_INFO_WUNLOCK(&udbinfo);
980 return error;
981}
982
983static int
984udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
985{
986 struct inpcb *inp;
987 int s, error;
988 struct sockaddr_in *sin;
989
990 INP_INFO_WLOCK(&udbinfo);
991 inp = sotoinpcb(so);
992 if (inp == 0) {
993 INP_INFO_WUNLOCK(&udbinfo);
994 return EINVAL;
995 }
996 INP_LOCK(inp);
997 if (inp->inp_faddr.s_addr != INADDR_ANY) {
998 INP_UNLOCK(inp);
999 INP_INFO_WUNLOCK(&udbinfo);
1000 return EISCONN;
1001 }
1002 s = splnet();
1003 sin = (struct sockaddr_in *)nam;
1004 if (td && jailed(td->td_ucred))
1005 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr);
1006 error = in_pcbconnect(inp, nam, td->td_ucred);
1007 splx(s);
1008 if (error == 0)
1009 soisconnected(so);
1010 INP_UNLOCK(inp);
1011 INP_INFO_WUNLOCK(&udbinfo);
1012 return error;
1013}
1014
1015static int
1016udp_detach(struct socket *so)
1017{
1018 struct inpcb *inp;
1019 int s;
1020
1021 INP_INFO_WLOCK(&udbinfo);
1022 inp = sotoinpcb(so);
1023 if (inp == 0) {
1024 INP_INFO_WUNLOCK(&udbinfo);
1025 return EINVAL;
1026 }
1027 INP_LOCK(inp);
1028 s = splnet();
1029 in_pcbdetach(inp);
1030 INP_INFO_WUNLOCK(&udbinfo);
1031 splx(s);
1032 return 0;
1033}
1034
1035static int
1036udp_disconnect(struct socket *so)
1037{
1038 struct inpcb *inp;
1039 int s;
1040
1041 INP_INFO_WLOCK(&udbinfo);
1042 inp = sotoinpcb(so);
1043 if (inp == 0) {
1044 INP_INFO_WUNLOCK(&udbinfo);
1045 return EINVAL;
1046 }
1047 INP_LOCK(inp);
1048 if (inp->inp_faddr.s_addr == INADDR_ANY) {
1049 INP_INFO_WUNLOCK(&udbinfo);
1050 INP_UNLOCK(inp);
1051 return ENOTCONN;
1052 }
1053
1054 s = splnet();
1055 in_pcbdisconnect(inp);
1056 inp->inp_laddr.s_addr = INADDR_ANY;
1057 INP_UNLOCK(inp);
1058 INP_INFO_WUNLOCK(&udbinfo);
1059 splx(s);
1060 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1061 return 0;
1062}
1063
1064static int
1065udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1066 struct mbuf *control, struct thread *td)
1067{
1068 struct inpcb *inp;
1069
1070 inp = sotoinpcb(so);
1071 return udp_output(inp, m, addr, control, td);
1072}
1073
1074int
1075udp_shutdown(struct socket *so)
1076{
1077 struct inpcb *inp;
1078
1079 INP_INFO_RLOCK(&udbinfo);
1080 inp = sotoinpcb(so);
1081 if (inp == 0) {
1082 INP_INFO_RUNLOCK(&udbinfo);
1083 return EINVAL;
1084 }
1085 INP_LOCK(inp);
1086 INP_INFO_RUNLOCK(&udbinfo);
1087 socantsendmore(so);
1088 INP_UNLOCK(inp);
1089 return 0;
1090}
1091
1092/*
1093 * This is the wrapper function for in_setsockaddr. We just pass down
1094 * the pcbinfo for in_setsockaddr to lock. We don't want to do the locking
1095 * here because in_setsockaddr will call malloc and might block.
1096 */
1097static int
1098udp_sockaddr(struct socket *so, struct sockaddr **nam)
1099{
1100 return (in_setsockaddr(so, nam, &udbinfo));
1101}
1102
1103/*
1104 * This is the wrapper function for in_setpeeraddr. We just pass down
1105 * the pcbinfo for in_setpeeraddr to lock.
1106 */
1107static int
1108udp_peeraddr(struct socket *so, struct sockaddr **nam)
1109{
1110 return (in_setpeeraddr(so, nam, &udbinfo));
1111}
1112
1113struct pr_usrreqs udp_usrreqs = {
| 31 */
32
33#include "opt_ipsec.h"
34#include "opt_inet6.h"
35#include "opt_mac.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/domain.h>
40#include <sys/jail.h>
41#include <sys/kernel.h>
42#include <sys/lock.h>
43#include <sys/mac.h>
44#include <sys/malloc.h>
45#include <sys/mbuf.h>
46#include <sys/proc.h>
47#include <sys/protosw.h>
48#include <sys/signalvar.h>
49#include <sys/socket.h>
50#include <sys/socketvar.h>
51#include <sys/sx.h>
52#include <sys/sysctl.h>
53#include <sys/syslog.h>
54
55#include <vm/uma.h>
56
57#include <net/if.h>
58#include <net/route.h>
59
60#include <netinet/in.h>
61#include <netinet/in_systm.h>
62#include <netinet/in_pcb.h>
63#include <netinet/in_var.h>
64#include <netinet/ip.h>
65#ifdef INET6
66#include <netinet/ip6.h>
67#endif
68#include <netinet/ip_icmp.h>
69#include <netinet/icmp_var.h>
70#include <netinet/ip_var.h>
71#ifdef INET6
72#include <netinet6/ip6_var.h>
73#endif
74#include <netinet/udp.h>
75#include <netinet/udp_var.h>
76
77#ifdef FAST_IPSEC
78#include <netipsec/ipsec.h>
79#endif /*FAST_IPSEC*/
80
81#ifdef IPSEC
82#include <netinet6/ipsec.h>
83#endif /*IPSEC*/
84
85#include <machine/in_cksum.h>
86
87/*
88 * UDP protocol implementation.
89 * Per RFC 768, August, 1980.
90 */
91#ifndef COMPAT_42
92static int udpcksum = 1;
93#else
94static int udpcksum = 0; /* XXX */
95#endif
96SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
97 &udpcksum, 0, "");
98
99int log_in_vain = 0;
100SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
101 &log_in_vain, 0, "Log all incoming UDP packets");
102
103static int blackhole = 0;
104SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW,
105 &blackhole, 0, "Do not send port unreachables for refused connects");
106
107static int strict_mcast_mship = 0;
108SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW,
109 &strict_mcast_mship, 0, "Only send multicast to member sockets");
110
111struct inpcbhead udb; /* from udp_var.h */
112#define udb6 udb /* for KAME src sync over BSD*'s */
113struct inpcbinfo udbinfo;
114
115#ifndef UDBHASHSIZE
116#define UDBHASHSIZE 16
117#endif
118
119struct udpstat udpstat; /* from udp_var.h */
120SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW,
121 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
122
123static void udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n,
124 int off, struct sockaddr_in *udp_in);
125
126static int udp_detach(struct socket *so);
127static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
128 struct mbuf *, struct thread *);
129
130void
131udp_init()
132{
133 INP_INFO_LOCK_INIT(&udbinfo, "udp");
134 LIST_INIT(&udb);
135 udbinfo.listhead = &udb;
136 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask);
137 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB,
138 &udbinfo.porthashmask);
139 udbinfo.ipi_zone = uma_zcreate("udpcb", sizeof(struct inpcb), NULL,
140 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
141 uma_zone_set_max(udbinfo.ipi_zone, maxsockets);
142}
143
144void
145udp_input(m, off)
146 register struct mbuf *m;
147 int off;
148{
149 int iphlen = off;
150 register struct ip *ip;
151 register struct udphdr *uh;
152 register struct inpcb *inp;
153 struct mbuf *opts = 0;
154 int len;
155 struct ip save_ip;
156 struct sockaddr_in udp_in;
157
158 udpstat.udps_ipackets++;
159
160 /*
161 * Strip IP options, if any; should skip this,
162 * make available to user, and use on returned packets,
163 * but we don't yet have a way to check the checksum
164 * with options still present.
165 */
166 if (iphlen > sizeof (struct ip)) {
167 ip_stripoptions(m, (struct mbuf *)0);
168 iphlen = sizeof(struct ip);
169 }
170
171 /*
172 * Get IP and UDP header together in first mbuf.
173 */
174 ip = mtod(m, struct ip *);
175 if (m->m_len < iphlen + sizeof(struct udphdr)) {
176 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
177 udpstat.udps_hdrops++;
178 return;
179 }
180 ip = mtod(m, struct ip *);
181 }
182 uh = (struct udphdr *)((caddr_t)ip + iphlen);
183
184 /* destination port of 0 is illegal, based on RFC768. */
185 if (uh->uh_dport == 0)
186 goto badunlocked;
187
188 /*
189 * Construct sockaddr format source address.
190 * Stuff source address and datagram in user buffer.
191 */
192 bzero(&udp_in, sizeof(udp_in));
193 udp_in.sin_len = sizeof(udp_in);
194 udp_in.sin_family = AF_INET;
195 udp_in.sin_port = uh->uh_sport;
196 udp_in.sin_addr = ip->ip_src;
197
198 /*
199 * Make mbuf data length reflect UDP length.
200 * If not enough data to reflect UDP length, drop.
201 */
202 len = ntohs((u_short)uh->uh_ulen);
203 if (ip->ip_len != len) {
204 if (len > ip->ip_len || len < sizeof(struct udphdr)) {
205 udpstat.udps_badlen++;
206 goto badunlocked;
207 }
208 m_adj(m, len - ip->ip_len);
209 /* ip->ip_len = len; */
210 }
211 /*
212 * Save a copy of the IP header in case we want restore it
213 * for sending an ICMP error message in response.
214 */
215 if (!blackhole)
216 save_ip = *ip;
217
218 /*
219 * Checksum extended UDP header and data.
220 */
221 if (uh->uh_sum) {
222 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
223 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
224 uh->uh_sum = m->m_pkthdr.csum_data;
225 else
226 uh->uh_sum = in_pseudo(ip->ip_src.s_addr,
227 ip->ip_dst.s_addr, htonl((u_short)len +
228 m->m_pkthdr.csum_data + IPPROTO_UDP));
229 uh->uh_sum ^= 0xffff;
230 } else {
231 char b[9];
232 bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
233 bzero(((struct ipovly *)ip)->ih_x1, 9);
234 ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
235 uh->uh_sum = in_cksum(m, len + sizeof (struct ip));
236 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
237 }
238 if (uh->uh_sum) {
239 udpstat.udps_badsum++;
240 m_freem(m);
241 return;
242 }
243 } else
244 udpstat.udps_nosum++;
245
246 INP_INFO_RLOCK(&udbinfo);
247
248 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
249 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
250 struct inpcb *last;
251 /*
252 * Deliver a multicast or broadcast datagram to *all* sockets
253 * for which the local and remote addresses and ports match
254 * those of the incoming datagram. This allows more than
255 * one process to receive multi/broadcasts on the same port.
256 * (This really ought to be done for unicast datagrams as
257 * well, but that would cause problems with existing
258 * applications that open both address-specific sockets and
259 * a wildcard socket listening to the same port -- they would
260 * end up receiving duplicates of every unicast datagram.
261 * Those applications open the multiple sockets to overcome an
262 * inadequacy of the UDP socket interface, but for backwards
263 * compatibility we avoid the problem here rather than
264 * fixing the interface. Maybe 4.5BSD will remedy this?)
265 */
266
267 /*
268 * Locate pcb(s) for datagram.
269 * (Algorithm copied from raw_intr().)
270 */
271 last = NULL;
272 LIST_FOREACH(inp, &udb, inp_list) {
273 if (inp->inp_lport != uh->uh_dport)
274 continue;
275#ifdef INET6
276 if ((inp->inp_vflag & INP_IPV4) == 0)
277 continue;
278#endif
279 if (inp->inp_laddr.s_addr != INADDR_ANY) {
280 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
281 continue;
282 }
283 if (inp->inp_faddr.s_addr != INADDR_ANY) {
284 if (inp->inp_faddr.s_addr !=
285 ip->ip_src.s_addr ||
286 inp->inp_fport != uh->uh_sport)
287 continue;
288 }
289 INP_LOCK(inp);
290
291 /*
292 * Check multicast packets to make sure they are only
293 * sent to sockets with multicast memberships for the
294 * packet's destination address and arrival interface
295 */
296#define MSHIP(_inp, n) ((_inp)->inp_moptions->imo_membership[(n)])
297#define NMSHIPS(_inp) ((_inp)->inp_moptions->imo_num_memberships)
298 if (strict_mcast_mship && inp->inp_moptions != NULL) {
299 int mship, foundmship = 0;
300
301 for (mship = 0; mship < NMSHIPS(inp); mship++) {
302 if (MSHIP(inp, mship)->inm_addr.s_addr
303 == ip->ip_dst.s_addr &&
304 MSHIP(inp, mship)->inm_ifp
305 == m->m_pkthdr.rcvif) {
306 foundmship = 1;
307 break;
308 }
309 }
310 if (foundmship == 0) {
311 INP_UNLOCK(inp);
312 continue;
313 }
314 }
315#undef NMSHIPS
316#undef MSHIP
317 if (last != NULL) {
318 struct mbuf *n;
319
320 n = m_copy(m, 0, M_COPYALL);
321 if (n != NULL)
322 udp_append(last, ip, n,
323 iphlen +
324 sizeof(struct udphdr),
325 &udp_in);
326 INP_UNLOCK(last);
327 }
328 last = inp;
329 /*
330 * Don't look for additional matches if this one does
331 * not have either the SO_REUSEPORT or SO_REUSEADDR
332 * socket options set. This heuristic avoids searching
333 * through all pcbs in the common case of a non-shared
334 * port. It * assumes that an application will never
335 * clear these options after setting them.
336 */
337 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0)
338 break;
339 }
340
341 if (last == NULL) {
342 /*
343 * No matching pcb found; discard datagram.
344 * (No need to send an ICMP Port Unreachable
345 * for a broadcast or multicast datgram.)
346 */
347 udpstat.udps_noportbcast++;
348 goto badheadlocked;
349 }
350 udp_append(last, ip, m, iphlen + sizeof(struct udphdr),
351 &udp_in);
352 INP_UNLOCK(last);
353 INP_INFO_RUNLOCK(&udbinfo);
354 return;
355 }
356 /*
357 * Locate pcb for datagram.
358 */
359 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport,
360 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
361 if (inp == NULL) {
362 if (log_in_vain) {
363 char buf[4*sizeof "123"];
364
365 strcpy(buf, inet_ntoa(ip->ip_dst));
366 log(LOG_INFO,
367 "Connection attempt to UDP %s:%d from %s:%d\n",
368 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
369 ntohs(uh->uh_sport));
370 }
371 udpstat.udps_noport++;
372 if (m->m_flags & (M_BCAST | M_MCAST)) {
373 udpstat.udps_noportbcast++;
374 goto badheadlocked;
375 }
376 if (blackhole)
377 goto badheadlocked;
378 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
379 goto badheadlocked;
380 *ip = save_ip;
381 ip->ip_len += iphlen;
382 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
383 INP_INFO_RUNLOCK(&udbinfo);
384 return;
385 }
386 INP_LOCK(inp);
387 udp_append(inp, ip, m, iphlen + sizeof(struct udphdr), &udp_in);
388 INP_UNLOCK(inp);
389 INP_INFO_RUNLOCK(&udbinfo);
390 return;
391
392badheadlocked:
393 if (inp)
394 INP_UNLOCK(inp);
395 INP_INFO_RUNLOCK(&udbinfo);
396badunlocked:
397 m_freem(m);
398 if (opts)
399 m_freem(opts);
400 return;
401}
402
403/*
404 * Subroutine of udp_input(), which appends the provided mbuf chain to the
405 * passed pcb/socket. The caller must provide a sockaddr_in via udp_in that
406 * contains the source address. If the socket ends up being an IPv6 socket,
407 * udp_append() will convert to a sockaddr_in6 before passing the address
408 * into the socket code.
409 */
410static void
411udp_append(last, ip, n, off, udp_in)
412 struct inpcb *last;
413 struct ip *ip;
414 struct mbuf *n;
415 int off;
416 struct sockaddr_in *udp_in;
417{
418 struct sockaddr *append_sa;
419 struct socket *so;
420 struct mbuf *opts = 0;
421#ifdef INET6
422 struct sockaddr_in6 udp_in6;
423#endif
424
425 INP_LOCK_ASSERT(last);
426
427#if defined(IPSEC) || defined(FAST_IPSEC)
428 /* check AH/ESP integrity. */
429 if (ipsec4_in_reject(n, last)) {
430#ifdef IPSEC
431 ipsecstat.in_polvio++;
432#endif /*IPSEC*/
433 m_freem(n);
434 return;
435 }
436#endif /*IPSEC || FAST_IPSEC*/
437#ifdef MAC
438 if (mac_check_inpcb_deliver(last, n) != 0) {
439 m_freem(n);
440 return;
441 }
442#endif
443 if (last->inp_flags & INP_CONTROLOPTS ||
444 last->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
445#ifdef INET6
446 if (last->inp_vflag & INP_IPV6) {
447 int savedflags;
448
449 savedflags = last->inp_flags;
450 last->inp_flags &= ~INP_UNMAPPABLEOPTS;
451 ip6_savecontrol(last, n, &opts);
452 last->inp_flags = savedflags;
453 } else
454#endif
455 ip_savecontrol(last, &opts, ip, n);
456 }
457#ifdef INET6
458 if (last->inp_vflag & INP_IPV6) {
459 bzero(&udp_in6, sizeof(udp_in6));
460 udp_in6.sin6_len = sizeof(udp_in6);
461 udp_in6.sin6_family = AF_INET6;
462 in6_sin_2_v4mapsin6(udp_in, &udp_in6);
463 append_sa = (struct sockaddr *)&udp_in6;
464 } else
465#endif
466 append_sa = (struct sockaddr *)udp_in;
467 m_adj(n, off);
468
469 so = last->inp_socket;
470 SOCKBUF_LOCK(&so->so_rcv);
471 if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
472 m_freem(n);
473 if (opts)
474 m_freem(opts);
475 udpstat.udps_fullsock++;
476 SOCKBUF_UNLOCK(&so->so_rcv);
477 } else
478 sorwakeup_locked(so);
479}
480
481/*
482 * Notify a udp user of an asynchronous error;
483 * just wake up so that he can collect error status.
484 */
485struct inpcb *
486udp_notify(inp, errno)
487 register struct inpcb *inp;
488 int errno;
489{
490 inp->inp_socket->so_error = errno;
491 sorwakeup(inp->inp_socket);
492 sowwakeup(inp->inp_socket);
493 return inp;
494}
495
496void
497udp_ctlinput(cmd, sa, vip)
498 int cmd;
499 struct sockaddr *sa;
500 void *vip;
501{
502 struct ip *ip = vip;
503 struct udphdr *uh;
504 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
505 struct in_addr faddr;
506 struct inpcb *inp;
507 int s;
508
509 faddr = ((struct sockaddr_in *)sa)->sin_addr;
510 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
511 return;
512
513 /*
514 * Redirects don't need to be handled up here.
515 */
516 if (PRC_IS_REDIRECT(cmd))
517 return;
518 /*
519 * Hostdead is ugly because it goes linearly through all PCBs.
520 * XXX: We never get this from ICMP, otherwise it makes an
521 * excellent DoS attack on machines with many connections.
522 */
523 if (cmd == PRC_HOSTDEAD)
524 ip = 0;
525 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
526 return;
527 if (ip) {
528 s = splnet();
529 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
530 INP_INFO_RLOCK(&udbinfo);
531 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport,
532 ip->ip_src, uh->uh_sport, 0, NULL);
533 if (inp != NULL) {
534 INP_LOCK(inp);
535 if (inp->inp_socket != NULL) {
536 (*notify)(inp, inetctlerrmap[cmd]);
537 }
538 INP_UNLOCK(inp);
539 }
540 INP_INFO_RUNLOCK(&udbinfo);
541 splx(s);
542 } else
543 in_pcbnotifyall(&udbinfo, faddr, inetctlerrmap[cmd], notify);
544}
545
546static int
547udp_pcblist(SYSCTL_HANDLER_ARGS)
548{
549 int error, i, n, s;
550 struct inpcb *inp, **inp_list;
551 inp_gen_t gencnt;
552 struct xinpgen xig;
553
554 /*
555 * The process of preparing the TCB list is too time-consuming and
556 * resource-intensive to repeat twice on every request.
557 */
558 if (req->oldptr == 0) {
559 n = udbinfo.ipi_count;
560 req->oldidx = 2 * (sizeof xig)
561 + (n + n/8) * sizeof(struct xinpcb);
562 return 0;
563 }
564
565 if (req->newptr != 0)
566 return EPERM;
567
568 /*
569 * OK, now we're committed to doing something.
570 */
571 s = splnet();
572 INP_INFO_RLOCK(&udbinfo);
573 gencnt = udbinfo.ipi_gencnt;
574 n = udbinfo.ipi_count;
575 INP_INFO_RUNLOCK(&udbinfo);
576 splx(s);
577
578 error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
579 + n * sizeof(struct xinpcb));
580 if (error != 0)
581 return (error);
582
583 xig.xig_len = sizeof xig;
584 xig.xig_count = n;
585 xig.xig_gen = gencnt;
586 xig.xig_sogen = so_gencnt;
587 error = SYSCTL_OUT(req, &xig, sizeof xig);
588 if (error)
589 return error;
590
591 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
592 if (inp_list == 0)
593 return ENOMEM;
594
595 s = splnet();
596 INP_INFO_RLOCK(&udbinfo);
597 for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n;
598 inp = LIST_NEXT(inp, inp_list)) {
599 INP_LOCK(inp);
600 if (inp->inp_gencnt <= gencnt &&
601 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0)
602 inp_list[i++] = inp;
603 INP_UNLOCK(inp);
604 }
605 INP_INFO_RUNLOCK(&udbinfo);
606 splx(s);
607 n = i;
608
609 error = 0;
610 for (i = 0; i < n; i++) {
611 inp = inp_list[i];
612 if (inp->inp_gencnt <= gencnt) {
613 struct xinpcb xi;
614 xi.xi_len = sizeof xi;
615 /* XXX should avoid extra copy */
616 bcopy(inp, &xi.xi_inp, sizeof *inp);
617 if (inp->inp_socket)
618 sotoxsocket(inp->inp_socket, &xi.xi_socket);
619 xi.xi_inp.inp_gencnt = inp->inp_gencnt;
620 error = SYSCTL_OUT(req, &xi, sizeof xi);
621 }
622 }
623 if (!error) {
624 /*
625 * Give the user an updated idea of our state.
626 * If the generation differs from what we told
627 * her before, she knows that something happened
628 * while we were processing this request, and it
629 * might be necessary to retry.
630 */
631 s = splnet();
632 INP_INFO_RLOCK(&udbinfo);
633 xig.xig_gen = udbinfo.ipi_gencnt;
634 xig.xig_sogen = so_gencnt;
635 xig.xig_count = udbinfo.ipi_count;
636 INP_INFO_RUNLOCK(&udbinfo);
637 splx(s);
638 error = SYSCTL_OUT(req, &xig, sizeof xig);
639 }
640 free(inp_list, M_TEMP);
641 return error;
642}
643
644SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0,
645 udp_pcblist, "S,xinpcb", "List of active UDP sockets");
646
647static int
648udp_getcred(SYSCTL_HANDLER_ARGS)
649{
650 struct xucred xuc;
651 struct sockaddr_in addrs[2];
652 struct inpcb *inp;
653 int error, s;
654
655 error = suser_cred(req->td->td_ucred, SUSER_ALLOWJAIL);
656 if (error)
657 return (error);
658 error = SYSCTL_IN(req, addrs, sizeof(addrs));
659 if (error)
660 return (error);
661 s = splnet();
662 INP_INFO_RLOCK(&udbinfo);
663 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
664 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL);
665 if (inp == NULL || inp->inp_socket == NULL) {
666 error = ENOENT;
667 goto out;
668 }
669 error = cr_canseesocket(req->td->td_ucred, inp->inp_socket);
670 if (error)
671 goto out;
672 cru2x(inp->inp_socket->so_cred, &xuc);
673out:
674 INP_INFO_RUNLOCK(&udbinfo);
675 splx(s);
676 if (error == 0)
677 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
678 return (error);
679}
680
681SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
682 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
683 udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
684
685static int
686udp_output(inp, m, addr, control, td)
687 register struct inpcb *inp;
688 struct mbuf *m;
689 struct sockaddr *addr;
690 struct mbuf *control;
691 struct thread *td;
692{
693 register struct udpiphdr *ui;
694 register int len = m->m_pkthdr.len;
695 struct in_addr faddr, laddr;
696 struct cmsghdr *cm;
697 struct sockaddr_in *sin, src;
698 int error = 0;
699 int ipflags;
700 u_short fport, lport;
701 int unlock_udbinfo;
702
703 /*
704 * udp_output() may need to temporarily bind or connect the current
705 * inpcb. As such, we don't know up front what inpcb locks we will
706 * need. Do any work to decide what is needed up front before
707 * acquiring locks.
708 */
709 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
710 if (control)
711 m_freem(control);
712 m_freem(m);
713 return EMSGSIZE;
714 }
715
716 src.sin_addr.s_addr = INADDR_ANY;
717 if (control != NULL) {
718 /*
719 * XXX: Currently, we assume all the optional information
720 * is stored in a single mbuf.
721 */
722 if (control->m_next) {
723 m_freem(control);
724 m_freem(m);
725 return EINVAL;
726 }
727 for (; control->m_len > 0;
728 control->m_data += CMSG_ALIGN(cm->cmsg_len),
729 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
730 cm = mtod(control, struct cmsghdr *);
731 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0 ||
732 cm->cmsg_len > control->m_len) {
733 error = EINVAL;
734 break;
735 }
736 if (cm->cmsg_level != IPPROTO_IP)
737 continue;
738
739 switch (cm->cmsg_type) {
740 case IP_SENDSRCADDR:
741 if (cm->cmsg_len !=
742 CMSG_LEN(sizeof(struct in_addr))) {
743 error = EINVAL;
744 break;
745 }
746 bzero(&src, sizeof(src));
747 src.sin_family = AF_INET;
748 src.sin_len = sizeof(src);
749 src.sin_port = inp->inp_lport;
750 src.sin_addr = *(struct in_addr *)CMSG_DATA(cm);
751 break;
752 default:
753 error = ENOPROTOOPT;
754 break;
755 }
756 if (error)
757 break;
758 }
759 m_freem(control);
760 }
761 if (error) {
762 m_freem(m);
763 return error;
764 }
765
766 if (src.sin_addr.s_addr != INADDR_ANY ||
767 addr != NULL) {
768 INP_INFO_WLOCK(&udbinfo);
769 unlock_udbinfo = 1;
770 } else
771 unlock_udbinfo = 0;
772 INP_LOCK(inp);
773
774#ifdef MAC
775 mac_create_mbuf_from_inpcb(inp, m);
776#endif
777
778 laddr = inp->inp_laddr;
779 lport = inp->inp_lport;
780 if (src.sin_addr.s_addr != INADDR_ANY) {
781 if (lport == 0) {
782 error = EINVAL;
783 goto release;
784 }
785 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
786 &laddr.s_addr, &lport, td->td_ucred);
787 if (error)
788 goto release;
789 }
790
791 if (addr) {
792 sin = (struct sockaddr_in *)addr;
793 if (td && jailed(td->td_ucred))
794 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr);
795 if (inp->inp_faddr.s_addr != INADDR_ANY) {
796 error = EISCONN;
797 goto release;
798 }
799 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, &lport,
800 &faddr.s_addr, &fport, NULL, td->td_ucred);
801 if (error)
802 goto release;
803
804 /* Commit the local port if newly assigned. */
805 if (inp->inp_laddr.s_addr == INADDR_ANY &&
806 inp->inp_lport == 0) {
807 inp->inp_lport = lport;
808 if (in_pcbinshash(inp) != 0) {
809 inp->inp_lport = 0;
810 error = EAGAIN;
811 goto release;
812 }
813 inp->inp_flags |= INP_ANONPORT;
814 }
815 } else {
816 faddr = inp->inp_faddr;
817 fport = inp->inp_fport;
818 if (faddr.s_addr == INADDR_ANY) {
819 error = ENOTCONN;
820 goto release;
821 }
822 }
823
824 /*
825 * Calculate data length and get a mbuf for UDP, IP, and possible
826 * link-layer headers. Immediate slide the data pointer back forward
827 * since we won't use that space at this layer.
828 */
829 M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_DONTWAIT);
830 if (m == NULL) {
831 error = ENOBUFS;
832 goto release;
833 }
834 m->m_data += max_linkhdr;
835 m->m_len -= max_linkhdr;
836 m->m_pkthdr.len -= max_linkhdr;
837
838 /*
839 * Fill in mbuf with extended UDP header
840 * and addresses and length put into network format.
841 */
842 ui = mtod(m, struct udpiphdr *);
843 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */
844 ui->ui_pr = IPPROTO_UDP;
845 ui->ui_src = laddr;
846 ui->ui_dst = faddr;
847 ui->ui_sport = lport;
848 ui->ui_dport = fport;
849 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
850
851 ipflags = 0;
852 if (inp->inp_socket->so_options & SO_DONTROUTE)
853 ipflags |= IP_ROUTETOIF;
854 if (inp->inp_socket->so_options & SO_BROADCAST)
855 ipflags |= IP_ALLOWBROADCAST;
856 if (inp->inp_flags & INP_ONESBCAST)
857 ipflags |= IP_SENDONES;
858
859 /*
860 * Set up checksum and output datagram.
861 */
862 if (udpcksum) {
863 if (inp->inp_flags & INP_ONESBCAST)
864 faddr.s_addr = INADDR_BROADCAST;
865 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
866 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
867 m->m_pkthdr.csum_flags = CSUM_UDP;
868 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
869 } else {
870 ui->ui_sum = 0;
871 }
872 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
873 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */
874 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */
875 udpstat.udps_opackets++;
876
877 if (unlock_udbinfo)
878 INP_INFO_WUNLOCK(&udbinfo);
879 error = ip_output(m, inp->inp_options, NULL, ipflags,
880 inp->inp_moptions, inp);
881 INP_UNLOCK(inp);
882 return (error);
883
884release:
885 INP_UNLOCK(inp);
886 if (unlock_udbinfo)
887 INP_INFO_WUNLOCK(&udbinfo);
888 m_freem(m);
889 return (error);
890}
891
892u_long udp_sendspace = 9216; /* really max datagram size */
893 /* 40 1K datagrams */
894SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
895 &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
896
897u_long udp_recvspace = 40 * (1024 +
898#ifdef INET6
899 sizeof(struct sockaddr_in6)
900#else
901 sizeof(struct sockaddr_in)
902#endif
903 );
904SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
905 &udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
906
907static int
908udp_abort(struct socket *so)
909{
910 struct inpcb *inp;
911 int s;
912
913 INP_INFO_WLOCK(&udbinfo);
914 inp = sotoinpcb(so);
915 if (inp == 0) {
916 INP_INFO_WUNLOCK(&udbinfo);
917 return EINVAL; /* ??? possible? panic instead? */
918 }
919 INP_LOCK(inp);
920 soisdisconnected(so);
921 s = splnet();
922 in_pcbdetach(inp);
923 INP_INFO_WUNLOCK(&udbinfo);
924 splx(s);
925 return 0;
926}
927
928static int
929udp_attach(struct socket *so, int proto, struct thread *td)
930{
931 struct inpcb *inp;
932 int s, error;
933
934 INP_INFO_WLOCK(&udbinfo);
935 inp = sotoinpcb(so);
936 if (inp != 0) {
937 INP_INFO_WUNLOCK(&udbinfo);
938 return EINVAL;
939 }
940 error = soreserve(so, udp_sendspace, udp_recvspace);
941 if (error) {
942 INP_INFO_WUNLOCK(&udbinfo);
943 return error;
944 }
945 s = splnet();
946 error = in_pcballoc(so, &udbinfo, "udpinp");
947 splx(s);
948 if (error) {
949 INP_INFO_WUNLOCK(&udbinfo);
950 return error;
951 }
952
953 inp = (struct inpcb *)so->so_pcb;
954 INP_LOCK(inp);
955 INP_INFO_WUNLOCK(&udbinfo);
956 inp->inp_vflag |= INP_IPV4;
957 inp->inp_ip_ttl = ip_defttl;
958 INP_UNLOCK(inp);
959 return 0;
960}
961
962static int
963udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
964{
965 struct inpcb *inp;
966 int s, error;
967
968 INP_INFO_WLOCK(&udbinfo);
969 inp = sotoinpcb(so);
970 if (inp == 0) {
971 INP_INFO_WUNLOCK(&udbinfo);
972 return EINVAL;
973 }
974 INP_LOCK(inp);
975 s = splnet();
976 error = in_pcbbind(inp, nam, td->td_ucred);
977 splx(s);
978 INP_UNLOCK(inp);
979 INP_INFO_WUNLOCK(&udbinfo);
980 return error;
981}
982
983static int
984udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
985{
986 struct inpcb *inp;
987 int s, error;
988 struct sockaddr_in *sin;
989
990 INP_INFO_WLOCK(&udbinfo);
991 inp = sotoinpcb(so);
992 if (inp == 0) {
993 INP_INFO_WUNLOCK(&udbinfo);
994 return EINVAL;
995 }
996 INP_LOCK(inp);
997 if (inp->inp_faddr.s_addr != INADDR_ANY) {
998 INP_UNLOCK(inp);
999 INP_INFO_WUNLOCK(&udbinfo);
1000 return EISCONN;
1001 }
1002 s = splnet();
1003 sin = (struct sockaddr_in *)nam;
1004 if (td && jailed(td->td_ucred))
1005 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr);
1006 error = in_pcbconnect(inp, nam, td->td_ucred);
1007 splx(s);
1008 if (error == 0)
1009 soisconnected(so);
1010 INP_UNLOCK(inp);
1011 INP_INFO_WUNLOCK(&udbinfo);
1012 return error;
1013}
1014
1015static int
1016udp_detach(struct socket *so)
1017{
1018 struct inpcb *inp;
1019 int s;
1020
1021 INP_INFO_WLOCK(&udbinfo);
1022 inp = sotoinpcb(so);
1023 if (inp == 0) {
1024 INP_INFO_WUNLOCK(&udbinfo);
1025 return EINVAL;
1026 }
1027 INP_LOCK(inp);
1028 s = splnet();
1029 in_pcbdetach(inp);
1030 INP_INFO_WUNLOCK(&udbinfo);
1031 splx(s);
1032 return 0;
1033}
1034
1035static int
1036udp_disconnect(struct socket *so)
1037{
1038 struct inpcb *inp;
1039 int s;
1040
1041 INP_INFO_WLOCK(&udbinfo);
1042 inp = sotoinpcb(so);
1043 if (inp == 0) {
1044 INP_INFO_WUNLOCK(&udbinfo);
1045 return EINVAL;
1046 }
1047 INP_LOCK(inp);
1048 if (inp->inp_faddr.s_addr == INADDR_ANY) {
1049 INP_INFO_WUNLOCK(&udbinfo);
1050 INP_UNLOCK(inp);
1051 return ENOTCONN;
1052 }
1053
1054 s = splnet();
1055 in_pcbdisconnect(inp);
1056 inp->inp_laddr.s_addr = INADDR_ANY;
1057 INP_UNLOCK(inp);
1058 INP_INFO_WUNLOCK(&udbinfo);
1059 splx(s);
1060 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1061 return 0;
1062}
1063
1064static int
1065udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1066 struct mbuf *control, struct thread *td)
1067{
1068 struct inpcb *inp;
1069
1070 inp = sotoinpcb(so);
1071 return udp_output(inp, m, addr, control, td);
1072}
1073
1074int
1075udp_shutdown(struct socket *so)
1076{
1077 struct inpcb *inp;
1078
1079 INP_INFO_RLOCK(&udbinfo);
1080 inp = sotoinpcb(so);
1081 if (inp == 0) {
1082 INP_INFO_RUNLOCK(&udbinfo);
1083 return EINVAL;
1084 }
1085 INP_LOCK(inp);
1086 INP_INFO_RUNLOCK(&udbinfo);
1087 socantsendmore(so);
1088 INP_UNLOCK(inp);
1089 return 0;
1090}
1091
1092/*
1093 * This is the wrapper function for in_setsockaddr. We just pass down
1094 * the pcbinfo for in_setsockaddr to lock. We don't want to do the locking
1095 * here because in_setsockaddr will call malloc and might block.
1096 */
1097static int
1098udp_sockaddr(struct socket *so, struct sockaddr **nam)
1099{
1100 return (in_setsockaddr(so, nam, &udbinfo));
1101}
1102
1103/*
1104 * This is the wrapper function for in_setpeeraddr. We just pass down
1105 * the pcbinfo for in_setpeeraddr to lock.
1106 */
1107static int
1108udp_peeraddr(struct socket *so, struct sockaddr **nam)
1109{
1110 return (in_setpeeraddr(so, nam, &udbinfo));
1111}
1112
1113struct pr_usrreqs udp_usrreqs = {
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