1 /*
2 * Copyright (c) 2004 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
4 *
5 * This code is derived from software contributed to The DragonFly Project
6 * by Jeffrey M. Hsu.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of The DragonFly Project nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific, prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 /*
35 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
36 * The Regents of the University of California. All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. Neither the name of the University nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 *
62 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
63 * $FreeBSD: src/sys/netinet/udp_usrreq.c,v 1.64.2.18 2003/01/24 05:11:34 sam Exp $
64 */
65
66 #include "opt_inet6.h"
67
68 #include <sys/param.h>
69 #include <sys/systm.h>
70 #include <sys/kernel.h>
71 #include <sys/malloc.h>
72 #include <sys/mbuf.h>
73 #include <sys/domain.h>
74 #include <sys/proc.h>
75 #include <sys/caps.h>
76 #include <sys/protosw.h>
77 #include <sys/socket.h>
78 #include <sys/socketvar.h>
79 #include <sys/sysctl.h>
80 #include <sys/syslog.h>
81 #include <sys/in_cksum.h>
82 #include <sys/ktr.h>
83 #include <sys/jail.h>
84
85 #include <sys/socketvar2.h>
86 #include <sys/serialize.h>
87
88 #include <machine/stdarg.h>
89
90 #include <net/if.h>
91 #include <net/route.h>
92 #include <net/netmsg2.h>
93 #include <net/netisr2.h>
94
95 #include <netinet/in.h>
96 #include <netinet/in_systm.h>
97 #include <netinet/ip.h>
98 #ifdef INET6
99 #include <netinet/ip6.h>
100 #endif
101 #include <netinet/in_pcb.h>
102 #include <netinet/in_var.h>
103 #include <netinet/ip_var.h>
104 #ifdef INET6
105 #include <netinet6/ip6_var.h>
106 #endif
107 #include <netinet/ip_icmp.h>
108 #include <netinet/icmp_var.h>
109 #include <netinet/udp.h>
110 #include <netinet/udp_var.h>
111
112 #define MSGF_UDP_SEND MSGF_PROTO1
113
114 #define INP_DIRECT_DETACH INP_FLAG_PROTO2
115
116 #define UDP_KTR_STRING "inp=%p"
117 #define UDP_KTR_ARGS struct inpcb *inp
118
119 #ifndef KTR_UDP
120 #define KTR_UDP KTR_ALL
121 #endif
122
123 KTR_INFO_MASTER(udp);
124 KTR_INFO(KTR_UDP, udp, send_beg, 0, UDP_KTR_STRING, UDP_KTR_ARGS);
125 KTR_INFO(KTR_UDP, udp, send_end, 1, UDP_KTR_STRING, UDP_KTR_ARGS);
126 KTR_INFO(KTR_UDP, udp, send_ipout, 2, UDP_KTR_STRING, UDP_KTR_ARGS);
127 KTR_INFO(KTR_UDP, udp, redisp_ipout_beg, 3, UDP_KTR_STRING, UDP_KTR_ARGS);
128 KTR_INFO(KTR_UDP, udp, redisp_ipout_end, 4, UDP_KTR_STRING, UDP_KTR_ARGS);
129 KTR_INFO(KTR_UDP, udp, send_redisp, 5, UDP_KTR_STRING, UDP_KTR_ARGS);
130 KTR_INFO(KTR_UDP, udp, send_inswildcard, 6, UDP_KTR_STRING, UDP_KTR_ARGS);
131
132 #define logudp(name, inp) KTR_LOG(udp_##name, inp)
133
134 /*
135 * UDP protocol implementation.
136 * Per RFC 768, August, 1980.
137 */
138 #ifndef COMPAT_42
139 static int udpcksum = 1;
140 #else
141 static int udpcksum = 0; /* XXX */
142 #endif
143 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
144 &udpcksum, 0, "Enable checksumming of UDP packets");
145
146 int log_in_vain = 0;
147 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
148 &log_in_vain, 0, "Log all incoming UDP packets");
149
150 static int blackhole = 0;
151 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW,
152 &blackhole, 0, "Do not send port unreachables for refused connects");
153
154 static int strict_mcast_mship = 1;
155 SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW,
156 &strict_mcast_mship, 0, "Only send multicast to member sockets");
157
158 int udp_sosend_async = 1;
159 SYSCTL_INT(_net_inet_udp, OID_AUTO, sosend_async, CTLFLAG_RW,
160 &udp_sosend_async, 0, "UDP asynchronized pru_send");
161
162 int udp_sosend_prepend = 1;
163 SYSCTL_INT(_net_inet_udp, OID_AUTO, sosend_prepend, CTLFLAG_RW,
164 &udp_sosend_prepend, 0,
165 "Prepend enough space for proto and link header in pru_send");
166
167 static int udp_reuseport_ext = 1;
168 SYSCTL_INT(_net_inet_udp, OID_AUTO, reuseport_ext, CTLFLAG_RW,
169 &udp_reuseport_ext, 0, "SO_REUSEPORT extension");
170
171 struct inpcbinfo udbinfo[MAXCPU];
172
173 #ifndef UDBHASHSIZE
174 #define UDBHASHSIZE 16
175 #endif
176 CTASSERT(powerof2(UDBHASHSIZE));
177
178 struct udpstat udpstat_percpu[MAXCPU] __cachealign;
179
180 static void udp_append(struct inpcb *last, struct ip *ip,
181 struct mbuf *n, int off, struct sockaddr_in *udp_in);
182
183 static int udp_connect_oncpu(struct inpcb *inp, struct sockaddr_in *sin,
184 struct sockaddr_in *if_sin, uint16_t hash);
185
186 static boolean_t udp_inswildcardhash(struct inpcb *inp,
187 struct netmsg_base *msg, int error);
188 static void udp_remwildcardhash(struct inpcb *inp);
189
190 static __inline int
udp_lportcpu(short lport)191 udp_lportcpu(short lport)
192 {
193 return (ntohs(lport) % netisr_ncpus);
194 }
195
196 void
udp_init(void)197 udp_init(void)
198 {
199 struct inpcbportinfo *portinfo;
200 int cpu;
201
202 portinfo = kmalloc(sizeof(*portinfo) * netisr_ncpus, M_PCB,
203 M_WAITOK | M_CACHEALIGN);
204
205 for (cpu = 0; cpu < netisr_ncpus; cpu++) {
206 struct inpcbinfo *uicb = &udbinfo[cpu];
207
208 /*
209 * NOTE:
210 * UDP pcb list, wildcard hash table and localgroup hash
211 * table are shared.
212 */
213 in_pcbinfo_init(uicb, cpu, TRUE);
214 uicb->hashbase = hashinit(UDBHASHSIZE, M_PCB, &uicb->hashmask);
215
216 in_pcbportinfo_init(&portinfo[cpu], UDBHASHSIZE, cpu);
217 in_pcbportinfo_set(uicb, portinfo, netisr_ncpus);
218
219 uicb->wildcardhashbase = hashinit(UDBHASHSIZE, M_PCB,
220 &uicb->wildcardhashmask);
221 uicb->localgrphashbase = hashinit(UDBHASHSIZE, M_PCB,
222 &uicb->localgrphashmask);
223
224 uicb->ipi_size = sizeof(struct inpcb);
225 }
226
227 /*
228 * Initialize UDP statistics counters for each CPU.
229 */
230 for (cpu = 0; cpu < netisr_ncpus; ++cpu)
231 bzero(&udpstat_percpu[cpu], sizeof(struct udpstat));
232 }
233
234 static int
sysctl_udpstat(SYSCTL_HANDLER_ARGS)235 sysctl_udpstat(SYSCTL_HANDLER_ARGS)
236 {
237 int cpu, error = 0;
238
239 for (cpu = 0; cpu < netisr_ncpus; ++cpu) {
240 if ((error = SYSCTL_OUT(req, &udpstat_percpu[cpu],
241 sizeof(struct udpstat))))
242 break;
243 if ((error = SYSCTL_IN(req, &udpstat_percpu[cpu],
244 sizeof(struct udpstat))))
245 break;
246 }
247
248 return (error);
249 }
250 SYSCTL_PROC(_net_inet_udp, UDPCTL_STATS, stats, (CTLTYPE_OPAQUE | CTLFLAG_RW),
251 0, 0, sysctl_udpstat, "S,udpstat", "UDP statistics");
252
253 void
udp_ctloutput(netmsg_t msg)254 udp_ctloutput(netmsg_t msg)
255 {
256 struct socket *so = msg->base.nm_so;
257 struct sockopt *sopt = msg->ctloutput.nm_sopt;
258 struct inpcb *inp = so->so_pcb;
259
260 if (inp == NULL) {
261 lwkt_replymsg(&msg->lmsg, EINVAL);
262 return;
263 }
264
265 if (sopt->sopt_level == IPPROTO_IP && sopt->sopt_dir == SOPT_SET) {
266 switch (sopt->sopt_name) {
267 case IP_MULTICAST_IF:
268 case IP_MULTICAST_VIF:
269 case IP_MULTICAST_TTL:
270 case IP_MULTICAST_LOOP:
271 case IP_ADD_MEMBERSHIP:
272 case IP_DROP_MEMBERSHIP:
273 /*
274 * This pr_ctloutput msg will be forwarded
275 * to netisr0 to run; we can't do direct
276 * detaching anymore.
277 *
278 * NOTE:
279 * Don't optimize for the sockets whose
280 * current so_port is netisr0's msgport.
281 * These sockets could be connect(2)'ed
282 * later and the so_port will be changed.
283 */
284 inp->inp_flags &= ~INP_DIRECT_DETACH;
285 break;
286 }
287 }
288 return ip_ctloutput(msg);
289 }
290
291 /*
292 * Check multicast packets to make sure they are only sent to sockets with
293 * multicast memberships for the packet's destination address and arrival
294 * interface. Multicast packets to multicast-unaware sockets are also
295 * disallowed.
296 *
297 * Returns 0 if the packet is acceptable, -1 if it is not.
298 */
299 static __inline int
check_multicast_membership(const struct ip * ip,const struct inpcb * inp,const struct mbuf * m)300 check_multicast_membership(const struct ip *ip, const struct inpcb *inp,
301 const struct mbuf *m)
302 {
303 const struct ip_moptions *mopt;
304 int mshipno;
305
306 if (strict_mcast_mship == 0 ||
307 !IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
308 return (0);
309 }
310
311 ASSERT_NETISR0;
312
313 mopt = inp->inp_moptions;
314 if (mopt == NULL)
315 return (-1);
316 for (mshipno = 0; mshipno < mopt->imo_num_memberships; ++mshipno) {
317 const struct in_multi *maddr = mopt->imo_membership[mshipno];
318
319 if (ip->ip_dst.s_addr == maddr->inm_addr.s_addr &&
320 m->m_pkthdr.rcvif == maddr->inm_ifp) {
321 return (0);
322 }
323 }
324 return (-1);
325 }
326
327 struct udp_mcast_arg {
328 struct inpcb *inp;
329 struct inpcb *last;
330 struct ip *ip;
331 struct mbuf *m;
332 int iphlen;
333 struct sockaddr_in *udp_in;
334 };
335
336 static int
udp_mcast_input(struct udp_mcast_arg * arg)337 udp_mcast_input(struct udp_mcast_arg *arg)
338 {
339 struct inpcb *inp = arg->inp;
340 struct inpcb *last = arg->last;
341 struct ip *ip = arg->ip;
342 struct mbuf *m = arg->m;
343
344 if (check_multicast_membership(ip, inp, m) < 0)
345 return ERESTART; /* caller continue */
346
347 if (last != NULL) {
348 struct mbuf *n;
349
350 if ((n = m_copypacket(m, M_NOWAIT)) != NULL)
351 udp_append(last, ip, n,
352 arg->iphlen + sizeof(struct udphdr),
353 arg->udp_in);
354 }
355 arg->last = last = inp;
356
357 /*
358 * Don't look for additional matches if this one does
359 * not have either the SO_REUSEPORT or SO_REUSEADDR
360 * socket options set. This heuristic avoids searching
361 * through all pcbs in the common case of a non-shared
362 * port. It * assumes that an application will never
363 * clear these options after setting them.
364 */
365 if (!(last->inp_socket->so_options &
366 (SO_REUSEPORT | SO_REUSEADDR)))
367 return EJUSTRETURN; /* caller stop */
368 return 0;
369 }
370
371 int
udp_input(struct mbuf ** mp,int * offp,int proto)372 udp_input(struct mbuf **mp, int *offp, int proto)
373 {
374 struct sockaddr_in udp_in = { sizeof udp_in, AF_INET };
375 int iphlen;
376 struct ip *ip;
377 struct udphdr *uh;
378 struct inpcb *inp;
379 struct mbuf *m;
380 struct mbuf *opts = NULL;
381 int ip_len, len, off;
382 struct ip save_ip;
383 struct inpcbinfo *pcbinfo = &udbinfo[mycpuid];
384
385 off = *offp;
386 m = *mp;
387 *mp = NULL;
388
389 iphlen = off;
390 udp_stat.udps_ipackets++;
391
392 /*
393 * Strip IP options, if any; should skip this,
394 * make available to user, and use on returned packets,
395 * but we don't yet have a way to check the checksum
396 * with options still present.
397 */
398 if (iphlen > sizeof(struct ip)) {
399 ip_stripoptions(m);
400 iphlen = sizeof(struct ip);
401 }
402
403 /*
404 * IP and UDP headers are together in first mbuf.
405 * Already checked and pulled up in ip_demux().
406 */
407 KASSERT(m->m_len >= iphlen + sizeof(struct udphdr),
408 ("UDP header not in one mbuf"));
409
410 ip = mtod(m, struct ip *);
411 uh = (struct udphdr *)((caddr_t)ip + iphlen);
412
413 /* destination port of 0 is illegal, based on RFC768. */
414 if (uh->uh_dport == 0)
415 goto bad;
416
417 /*
418 * Make mbuf data length reflect UDP length.
419 * If not enough data to reflect UDP length, drop.
420 */
421 len = ntohs((u_short)uh->uh_ulen);
422 ip_len = ntohs(ip->ip_len) - iphlen;
423 if (ip_len != len) {
424 if (len > ip_len || len < sizeof(struct udphdr)) {
425 udp_stat.udps_badlen++;
426 goto bad;
427 }
428 m_adj(m, len - ip_len);
429 /* ip->ip_len = htons(len); */
430 }
431 /*
432 * Save a copy of the IP header in case we want restore it
433 * for sending an ICMP error message in response.
434 */
435 save_ip = *ip;
436
437 /*
438 * Checksum extended UDP header and data.
439 */
440 if (uh->uh_sum) {
441 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
442 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
443 uh->uh_sum = m->m_pkthdr.csum_data;
444 else
445 uh->uh_sum = in_pseudo(ip->ip_src.s_addr,
446 ip->ip_dst.s_addr, htonl((u_short)len +
447 m->m_pkthdr.csum_data + IPPROTO_UDP));
448 uh->uh_sum ^= 0xffff;
449 } else {
450 char b[9];
451
452 bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
453 bzero(((struct ipovly *)ip)->ih_x1, 9);
454 ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
455 uh->uh_sum = in_cksum(m, len + sizeof(struct ip));
456 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
457 }
458 if (uh->uh_sum) {
459 udp_stat.udps_badsum++;
460 m_freem(m);
461 return(IPPROTO_DONE);
462 }
463 } else {
464 udp_stat.udps_nosum++;
465 }
466
467 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
468 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
469 struct inpcbhead *connhead;
470 struct inpcontainer *ic, *ic_marker;
471 struct inpcontainerhead *ichead;
472 struct udp_mcast_arg arg;
473 struct inpcb *last;
474 int error;
475
476 /*
477 * Deliver a multicast or broadcast datagram to *all* sockets
478 * for which the local and remote addresses and ports match
479 * those of the incoming datagram. This allows more than
480 * one process to receive multi/broadcasts on the same port.
481 * (This really ought to be done for unicast datagrams as
482 * well, but that would cause problems with existing
483 * applications that open both address-specific sockets and
484 * a wildcard socket listening to the same port -- they would
485 * end up receiving duplicates of every unicast datagram.
486 * Those applications open the multiple sockets to overcome an
487 * inadequacy of the UDP socket interface, but for backwards
488 * compatibility we avoid the problem here rather than
489 * fixing the interface. Maybe 4.5BSD will remedy this?)
490 */
491
492 /*
493 * Construct sockaddr format source address.
494 */
495 udp_in.sin_port = uh->uh_sport;
496 udp_in.sin_addr = ip->ip_src;
497 arg.udp_in = &udp_in;
498 /*
499 * Locate pcb(s) for datagram.
500 * (Algorithm copied from raw_intr().)
501 */
502 last = NULL;
503 arg.iphlen = iphlen;
504
505 connhead = &pcbinfo->hashbase[
506 INP_PCBCONNHASH(ip->ip_src.s_addr, uh->uh_sport,
507 ip->ip_dst.s_addr, uh->uh_dport, pcbinfo->hashmask)];
508 LIST_FOREACH(inp, connhead, inp_hash) {
509 #ifdef INET6
510 if (!INP_ISIPV4(inp))
511 continue;
512 #endif
513 if (!in_hosteq(inp->inp_faddr, ip->ip_src) ||
514 !in_hosteq(inp->inp_laddr, ip->ip_dst) ||
515 inp->inp_fport != uh->uh_sport ||
516 inp->inp_lport != uh->uh_dport)
517 continue;
518
519 arg.inp = inp;
520 arg.last = last;
521 arg.ip = ip;
522 arg.m = m;
523
524 error = udp_mcast_input(&arg);
525 if (error == ERESTART)
526 continue;
527 last = arg.last;
528
529 if (error == EJUSTRETURN)
530 goto done;
531 }
532
533 ichead = &pcbinfo->wildcardhashbase[
534 INP_PCBWILDCARDHASH(uh->uh_dport,
535 pcbinfo->wildcardhashmask)];
536 ic_marker = in_pcbcontainer_marker();
537
538 GET_PCBINFO_TOKEN(pcbinfo);
539 LIST_INSERT_HEAD(ichead, ic_marker, ic_list);
540 while ((ic = LIST_NEXT(ic_marker, ic_list)) != NULL) {
541 LIST_REMOVE(ic_marker, ic_list);
542 LIST_INSERT_AFTER(ic, ic_marker, ic_list);
543
544 inp = ic->ic_inp;
545 if (inp->inp_flags & INP_PLACEMARKER)
546 continue;
547 #ifdef INET6
548 if (!INP_ISIPV4(inp))
549 continue;
550 #endif
551 if (inp->inp_lport != uh->uh_dport)
552 continue;
553 if (inp->inp_laddr.s_addr != INADDR_ANY &&
554 inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
555 continue;
556
557 arg.inp = inp;
558 arg.last = last;
559 arg.ip = ip;
560 arg.m = m;
561
562 error = udp_mcast_input(&arg);
563 if (error == ERESTART)
564 continue;
565 last = arg.last;
566
567 if (error == EJUSTRETURN)
568 break;
569 }
570 LIST_REMOVE(ic_marker, ic_list);
571 REL_PCBINFO_TOKEN(pcbinfo);
572 done:
573 if (last == NULL) {
574 /*
575 * No matching pcb found; discard datagram.
576 * (No need to send an ICMP Port Unreachable
577 * for a broadcast or multicast datgram.)
578 */
579 udp_stat.udps_noportbcast++;
580 goto bad;
581 }
582 udp_append(last, ip, m,
583 iphlen + sizeof(struct udphdr), &udp_in);
584 return(IPPROTO_DONE);
585 }
586 /*
587 * Locate pcb for datagram.
588 */
589 inp = in_pcblookup_pkthash(pcbinfo, ip->ip_src, uh->uh_sport,
590 ip->ip_dst, uh->uh_dport, TRUE, m->m_pkthdr.rcvif,
591 udp_reuseport_ext ? m : NULL);
592 if (inp == NULL) {
593 if (log_in_vain) {
594 char src[INET_ADDRSTRLEN], dst[INET_ADDRSTRLEN];
595
596 log(LOG_INFO,
597 "Connection attempt to UDP %s:%d from %s:%d\n",
598 kinet_ntoa(ip->ip_dst, dst), ntohs(uh->uh_dport),
599 kinet_ntoa(ip->ip_src, src), ntohs(uh->uh_sport));
600 }
601 udp_stat.udps_noport++;
602 if (m->m_flags & (M_BCAST | M_MCAST)) {
603 udp_stat.udps_noportbcast++;
604 goto bad;
605 }
606 if (blackhole)
607 goto bad;
608 #ifdef ICMP_BANDLIM
609 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
610 goto bad;
611 #endif
612 *ip = save_ip;
613 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
614 return(IPPROTO_DONE);
615 }
616 KASSERT(INP_ISIPV4(inp), ("not inet inpcb"));
617 /*
618 * Check the minimum TTL for socket.
619 */
620 if (ip->ip_ttl < inp->inp_ip_minttl)
621 goto bad;
622
623 /*
624 * Construct sockaddr format source address.
625 * Stuff source address and datagram in user buffer.
626 */
627 udp_in.sin_port = uh->uh_sport;
628 udp_in.sin_addr = ip->ip_src;
629 if ((inp->inp_flags & INP_CONTROLOPTS) ||
630 (inp->inp_socket->so_options & SO_TIMESTAMP))
631 ip_savecontrol(inp, &opts, ip, m);
632 m_adj(m, iphlen + sizeof(struct udphdr));
633
634 lwkt_gettoken(&inp->inp_socket->so_rcv.ssb_token);
635 if (ssb_appendaddr(&inp->inp_socket->so_rcv,
636 (struct sockaddr *)&udp_in, m, opts) == 0) {
637 lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
638 udp_stat.udps_fullsock++;
639 soroverflow(inp->inp_socket);
640 goto bad;
641 }
642 lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
643 sorwakeup(inp->inp_socket);
644 return(IPPROTO_DONE);
645 bad:
646 m_freem(m);
647 if (opts)
648 m_freem(opts);
649 return(IPPROTO_DONE);
650 }
651
652 /*
653 * subroutine of udp_input(), mainly for source code readability.
654 * caller must properly init udp_ip6 and udp_in6 beforehand.
655 */
656 static void
udp_append(struct inpcb * last,struct ip * ip,struct mbuf * n,int off,struct sockaddr_in * udp_in)657 udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, int off,
658 struct sockaddr_in *udp_in)
659 {
660 struct mbuf *opts = NULL;
661 int ret;
662
663 KASSERT(INP_ISIPV4(last), ("not inet inpcb"));
664
665 if (last->inp_flags & INP_CONTROLOPTS ||
666 last->inp_socket->so_options & SO_TIMESTAMP)
667 ip_savecontrol(last, &opts, ip, n);
668 m_adj(n, off);
669
670 lwkt_gettoken(&last->inp_socket->so_rcv.ssb_token);
671 ret = ssb_appendaddr(&last->inp_socket->so_rcv,
672 (struct sockaddr *)udp_in, n, opts);
673 lwkt_reltoken(&last->inp_socket->so_rcv.ssb_token);
674 if (ret == 0) {
675 m_freem(n);
676 if (opts)
677 m_freem(opts);
678 udp_stat.udps_fullsock++;
679 } else {
680 sorwakeup(last->inp_socket);
681 }
682 }
683
684 /*
685 * Notify a udp user of an asynchronous error;
686 * just wake up so that he can collect error status.
687 */
688 void
udp_notify(struct inpcb * inp,int error)689 udp_notify(struct inpcb *inp, int error)
690 {
691 inp->inp_socket->so_error = error;
692 sorwakeup(inp->inp_socket);
693 sowwakeup(inp->inp_socket);
694 }
695
696 struct netmsg_udp_notify {
697 struct netmsg_base base;
698 inp_notify_t nm_notify;
699 struct in_addr nm_faddr;
700 int nm_arg;
701 };
702
703 static void
udp_notifyall_oncpu(netmsg_t msg)704 udp_notifyall_oncpu(netmsg_t msg)
705 {
706 struct netmsg_udp_notify *nm = (struct netmsg_udp_notify *)msg;
707 int nextcpu, cpu = mycpuid;
708
709 ASSERT_NETISR_NCPUS(cpu);
710
711 in_pcbnotifyall(&udbinfo[cpu], nm->nm_faddr, nm->nm_arg, nm->nm_notify);
712
713 nextcpu = cpu + 1;
714 if (nextcpu < netisr_ncpus)
715 lwkt_forwardmsg(netisr_cpuport(nextcpu), &nm->base.lmsg);
716 else
717 lwkt_replymsg(&nm->base.lmsg, 0);
718 }
719
720 inp_notify_t
udp_get_inpnotify(int cmd,const struct sockaddr * sa,struct ip ** ip0,int * cpuid)721 udp_get_inpnotify(int cmd, const struct sockaddr *sa,
722 struct ip **ip0, int *cpuid)
723 {
724 struct in_addr faddr;
725 struct ip *ip = *ip0;
726 inp_notify_t notify = udp_notify;
727
728 faddr = ((const struct sockaddr_in *)sa)->sin_addr;
729 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
730 return NULL;
731
732 if (PRC_IS_REDIRECT(cmd)) {
733 ip = NULL;
734 notify = in_rtchange;
735 } else if (cmd == PRC_HOSTDEAD) {
736 ip = NULL;
737 } else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) {
738 return NULL;
739 }
740
741 if (cpuid != NULL) {
742 if (ip == NULL) {
743 /* Go through all effective netisr CPUs. */
744 *cpuid = netisr_ncpus;
745 } else {
746 const struct udphdr *uh;
747
748 uh = (const struct udphdr *)
749 ((caddr_t)ip + (ip->ip_hl << 2));
750 *cpuid = udp_addrcpu(faddr.s_addr, uh->uh_dport,
751 ip->ip_src.s_addr, uh->uh_sport);
752 }
753 }
754
755 *ip0 = ip;
756 return notify;
757 }
758
759 void
udp_ctlinput(netmsg_t msg)760 udp_ctlinput(netmsg_t msg)
761 {
762 struct sockaddr *sa = msg->ctlinput.nm_arg;
763 struct ip *ip = msg->ctlinput.nm_extra;
764 int cmd = msg->ctlinput.nm_cmd, cpuid;
765 inp_notify_t notify;
766 struct in_addr faddr;
767
768 ASSERT_NETISR_NCPUS(mycpuid);
769
770 notify = udp_get_inpnotify(cmd, sa, &ip, &cpuid);
771 if (notify == NULL)
772 goto done;
773
774 faddr = ((struct sockaddr_in *)sa)->sin_addr;
775 if (ip) {
776 const struct udphdr *uh;
777 struct inpcb *inp;
778
779 if (cpuid != mycpuid)
780 goto done;
781
782 uh = (const struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
783 inp = in_pcblookup_hash(&udbinfo[mycpuid], faddr, uh->uh_dport,
784 ip->ip_src, uh->uh_sport, 0, NULL);
785 if (inp != NULL && inp->inp_socket != NULL)
786 notify(inp, inetctlerrmap[cmd]);
787 } else if (msg->ctlinput.nm_direct) {
788 if (cpuid != netisr_ncpus && cpuid != mycpuid)
789 goto done;
790
791 in_pcbnotifyall(&udbinfo[mycpuid], faddr, inetctlerrmap[cmd],
792 notify);
793 } else {
794 struct netmsg_udp_notify *nm;
795
796 ASSERT_NETISR0;
797 nm = kmalloc(sizeof(*nm), M_LWKTMSG, M_INTWAIT);
798 netmsg_init(&nm->base, NULL, &netisr_afree_rport,
799 0, udp_notifyall_oncpu);
800 nm->nm_faddr = faddr;
801 nm->nm_arg = inetctlerrmap[cmd];
802 nm->nm_notify = notify;
803 lwkt_sendmsg(netisr_cpuport(0), &nm->base.lmsg);
804 }
805 done:
806 lwkt_replymsg(&msg->lmsg, 0);
807 }
808
809 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, udbinfo, 0,
810 in_pcblist_ncpus, "S,xinpcb", "List of active UDP sockets");
811
812 static int
udp_getcred(SYSCTL_HANDLER_ARGS)813 udp_getcred(SYSCTL_HANDLER_ARGS)
814 {
815 struct sockaddr_in addrs[2];
816 struct ucred cred0, *cred = NULL;
817 struct inpcb *inp;
818 int error, cpu, origcpu;
819
820 error = caps_priv_check_td(req->td, SYSCAP_RESTRICTEDROOT);
821 if (error)
822 return (error);
823 error = SYSCTL_IN(req, addrs, sizeof addrs);
824 if (error)
825 return (error);
826
827 origcpu = mycpuid;
828 cpu = udp_addrcpu(addrs[1].sin_addr.s_addr, addrs[1].sin_port,
829 addrs[0].sin_addr.s_addr, addrs[0].sin_port);
830
831 lwkt_migratecpu(cpu);
832
833 inp = in_pcblookup_hash(&udbinfo[cpu],
834 addrs[1].sin_addr, addrs[1].sin_port,
835 addrs[0].sin_addr, addrs[0].sin_port, TRUE, NULL);
836 if (inp == NULL || inp->inp_socket == NULL) {
837 error = ENOENT;
838 } else if (inp->inp_socket->so_cred != NULL) {
839 cred0 = *(inp->inp_socket->so_cred);
840 cred = &cred0;
841 }
842
843 lwkt_migratecpu(origcpu);
844
845 if (error)
846 return error;
847
848 return SYSCTL_OUT(req, cred, sizeof(struct ucred));
849 }
850 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
851 0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection");
852
853 static void
udp_send_redispatch(netmsg_t msg)854 udp_send_redispatch(netmsg_t msg)
855 {
856 struct mbuf *m = msg->send.nm_m;
857 int pru_flags = msg->send.nm_flags;
858 struct inpcb *inp = msg->send.base.nm_so->so_pcb;
859 struct mbuf *m_opt = msg->send.nm_control; /* XXX save ipopt */
860 int flags = msg->send.nm_priv; /* ip_output flags */
861 int error;
862
863 logudp(redisp_ipout_beg, inp);
864
865 /*
866 * - Don't use inp route cache. It should only be used in the
867 * inp owner netisr.
868 * - Access to inp_moptions should be safe, since multicast UDP
869 * datagrams are redispatched to netisr0 and inp_moptions is
870 * changed only in netisr0.
871 */
872 error = ip_output(m, m_opt, NULL, flags, inp->inp_moptions, inp);
873 if ((pru_flags & PRUS_NOREPLY) == 0)
874 lwkt_replymsg(&msg->send.base.lmsg, error);
875
876 if (m_opt != NULL) {
877 /* Free saved ip options, if any */
878 m_freem(m_opt);
879 }
880
881 logudp(redisp_ipout_end, inp);
882 }
883
884 static void
udp_send(netmsg_t msg)885 udp_send(netmsg_t msg)
886 {
887 struct socket *so = msg->send.base.nm_so;
888 struct mbuf *m = msg->send.nm_m;
889 struct sockaddr *dstaddr = msg->send.nm_addr;
890 int pru_flags = msg->send.nm_flags;
891 struct inpcb *inp = so->so_pcb;
892 struct thread *td = msg->send.nm_td;
893 struct mbuf *control = msg->send.nm_control;
894 uint16_t hash;
895 int flags;
896
897 struct udpiphdr *ui;
898 int len = m->m_pkthdr.len;
899 struct sockaddr_in *sin; /* really is initialized before use */
900 int error = 0, cpu;
901 struct sockaddr_in src;
902 struct in_addr laddr;
903 u_char tos;
904
905 logudp(send_beg, inp);
906
907 if (inp == NULL) {
908 error = EINVAL;
909 goto release;
910 }
911
912 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
913 error = EMSGSIZE;
914 goto release;
915 }
916
917 if (inp->inp_lport == 0) { /* unbound socket */
918 boolean_t forwarded;
919
920 error = in_pcbbind(inp, NULL, td);
921 if (error)
922 goto release;
923
924 /*
925 * Need to call udp_send again, after this inpcb is
926 * inserted into wildcard hash table.
927 */
928 msg->send.base.lmsg.ms_flags |= MSGF_UDP_SEND;
929 forwarded = udp_inswildcardhash(inp, &msg->send.base, 0);
930 if (forwarded) {
931 /*
932 * The message is further forwarded, so we are
933 * done here.
934 */
935 logudp(send_inswildcard, inp);
936 return;
937 }
938 }
939
940 tos = inp->inp_ip_tos;
941 src.sin_family = 0;
942 if (control != NULL) {
943 struct cmsghdr *cm;
944
945 /*
946 * XXX: Currently, we assume all the optional information is
947 * stored in a single mbuf.
948 */
949 if (control->m_next) {
950 error = EINVAL;
951 goto release;
952 }
953 for (; control->m_len > 0;
954 control->m_data += CMSG_ALIGN(cm->cmsg_len),
955 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
956 cm = mtod(control, struct cmsghdr *);
957 if (control->m_len < sizeof(*cm) ||
958 cm->cmsg_len == 0 ||
959 cm->cmsg_len > control->m_len) {
960 error = EINVAL;
961 goto release;
962 }
963 if (cm->cmsg_level != IPPROTO_IP)
964 continue;
965
966 switch (cm->cmsg_type) {
967 case IP_SENDSRCADDR:
968 if (cm->cmsg_len !=
969 CMSG_LEN(sizeof(struct in_addr))) {
970 error = EINVAL;
971 goto release;
972 }
973 src.sin_family = AF_INET;
974 src.sin_len = sizeof(src);
975 src.sin_addr = *(struct in_addr *)CMSG_DATA(cm);
976 break;
977
978 case IP_TOS:
979 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) {
980 error = EINVAL;
981 goto release;
982 }
983 tos = *(u_char *)CMSG_DATA(cm);
984 break;
985
986 default:
987 error = ENOPROTOOPT;
988 goto release;
989 }
990 }
991 KKASSERT(error == 0);
992
993 m_freem(control);
994 control = NULL;
995 }
996
997 /*
998 * If the IP_SENDSRCADDR control message was specified, override the
999 * source address for this datagram. Its use is invalidated if the
1000 * address thus specified is incomplete or clobbers other inpcbs.
1001 */
1002 laddr = inp->inp_laddr;
1003 if (src.sin_family == AF_INET) {
1004 error = in_pcbsrcaddr_check(inp, &src, &laddr, td);
1005 if (error)
1006 goto release;
1007 }
1008
1009 if (dstaddr != NULL) { /* destination address specified */
1010 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1011 /* already connected */
1012 error = EISCONN;
1013 goto release;
1014 }
1015 sin = (struct sockaddr_in *)dstaddr;
1016 } else {
1017 if (inp->inp_faddr.s_addr == INADDR_ANY) {
1018 /* no destination specified and not already connected */
1019 error = ENOTCONN;
1020 goto release;
1021 }
1022 sin = NULL;
1023 }
1024
1025 /*
1026 * Calculate data length and get a mbuf
1027 * for UDP and IP headers.
1028 */
1029 M_PREPEND(m, sizeof(struct udpiphdr), M_NOWAIT);
1030 if (m == NULL) {
1031 error = ENOBUFS;
1032 goto release;
1033 }
1034
1035 /*
1036 * Fill in mbuf with extended UDP header
1037 * and addresses and length put into network format.
1038 */
1039 ui = mtod(m, struct udpiphdr *);
1040 bzero(ui->ui_x1, sizeof ui->ui_x1); /* XXX still needed? */
1041 ui->ui_pr = IPPROTO_UDP;
1042
1043 /*
1044 * Set destination address.
1045 */
1046 if (dstaddr != NULL) { /* use specified destination */
1047 ui->ui_dst = sin->sin_addr;
1048 ui->ui_dport = sin->sin_port;
1049 } else { /* use connected destination */
1050 ui->ui_dst = inp->inp_faddr;
1051 ui->ui_dport = inp->inp_fport;
1052 }
1053
1054 /*
1055 * Set source address.
1056 */
1057 if (laddr.s_addr == INADDR_ANY || IN_MULTICAST(ntohl(laddr.s_addr))) {
1058 struct sockaddr_in *if_sin;
1059
1060 if (dstaddr == NULL) {
1061 /*
1062 * connect() had (or should have) failed because
1063 * the interface had no IP address, but the
1064 * application proceeded to call send() anyways.
1065 */
1066 error = ENOTCONN;
1067 goto release;
1068 }
1069
1070 /* Look up outgoing interface. */
1071 error = in_pcbladdr_find(inp, dstaddr, &if_sin, td, 1);
1072 if (error)
1073 goto release;
1074 ui->ui_src = if_sin->sin_addr; /* use address of interface */
1075 } else {
1076 ui->ui_src = laddr; /* use non-null bound address */
1077 }
1078 ui->ui_sport = inp->inp_lport;
1079 KASSERT(inp->inp_lport != 0, ("inp lport should have been bound"));
1080
1081 /*
1082 * Release the original thread, since it is no longer used
1083 */
1084 if (pru_flags & PRUS_HELDTD) {
1085 lwkt_rele(td);
1086 pru_flags &= ~PRUS_HELDTD;
1087 }
1088 /*
1089 * Free the dest address, since it is no longer needed
1090 */
1091 if (pru_flags & PRUS_FREEADDR) {
1092 kfree(dstaddr, M_SONAME);
1093 pru_flags &= ~PRUS_FREEADDR;
1094 }
1095
1096 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1097
1098 /*
1099 * Set up checksum and output datagram.
1100 */
1101 if (udpcksum) {
1102 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr,
1103 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
1104 m->m_pkthdr.csum_flags = CSUM_UDP;
1105 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1106 m->m_pkthdr.csum_thlen = sizeof(struct udphdr);
1107 } else {
1108 ui->ui_sum = 0;
1109 }
1110 ((struct ip *)ui)->ip_len = htons(sizeof(struct udpiphdr) + len);
1111 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */
1112 ((struct ip *)ui)->ip_tos = tos;
1113 udp_stat.udps_opackets++;
1114
1115 flags = IP_DEBUGROUTE |
1116 (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST));
1117 if (pru_flags & PRUS_DONTROUTE)
1118 flags |= SO_DONTROUTE;
1119
1120 /*
1121 * NOTE:
1122 * For multicast bound and connected socket, source address of
1123 * the datagram is selected at the time of the sending, so the
1124 * datagram will have to be hashed.
1125 */
1126 if ((inp->inp_flags & INP_CONNECTED) &&
1127 ui->ui_src.s_addr == inp->inp_laddr.s_addr) {
1128 /*
1129 * For connected socket, this datagram has already
1130 * been in the correct netisr; no need to rehash.
1131 */
1132 KASSERT(inp->inp_flags & INP_HASH, ("inpcb has no hash"));
1133 m_sethash(m, inp->inp_hashval);
1134 goto sendit;
1135 }
1136
1137 hash = udp_addrhash(ui->ui_dst.s_addr, ui->ui_dport,
1138 ui->ui_src.s_addr, ui->ui_sport);
1139 m_sethash(m, hash);
1140
1141 cpu = netisr_hashcpu(hash);
1142 if (cpu != mycpuid) {
1143 struct mbuf *m_opt = NULL;
1144 struct netmsg_pru_send *smsg;
1145 struct lwkt_port *port = netisr_cpuport(cpu);
1146
1147 if (inp->inp_flags & INP_DIRECT_DETACH) {
1148 /*
1149 * No longer direct detachable, i.e. datagram has
1150 * to be forwarded to other CPUs for multicast
1151 * bound and connected socket.
1152 */
1153 inp->inp_flags &= ~INP_DIRECT_DETACH;
1154 }
1155
1156 /*
1157 * Not on the CPU that matches this UDP datagram hash;
1158 * redispatch to the correct CPU to do the ip_output().
1159 */
1160 if (inp->inp_options != NULL) {
1161 /*
1162 * If there are ip options, then save a copy,
1163 * since accessing inp_options on other CPUs'
1164 * is not safe.
1165 *
1166 * XXX optimize this?
1167 */
1168 m_opt = m_copym(inp->inp_options, 0, M_COPYALL,
1169 M_WAITOK);
1170 }
1171 if ((pru_flags & PRUS_NOREPLY) == 0) {
1172 /*
1173 * Change some parts of the original netmsg and
1174 * forward it to the target netisr.
1175 *
1176 * NOTE: so_port MUST NOT be checked in the target
1177 * netisr.
1178 */
1179 smsg = &msg->send;
1180 smsg->nm_priv = flags; /* ip_output flags */
1181 smsg->nm_m = m;
1182 smsg->nm_control = m_opt; /* XXX save ipopt */
1183 smsg->base.lmsg.ms_flags |= MSGF_IGNSOPORT;
1184 smsg->base.nm_dispatch = udp_send_redispatch;
1185 lwkt_forwardmsg(port, &smsg->base.lmsg);
1186 } else {
1187 /*
1188 * Recreate the netmsg, since the original mbuf
1189 * could have been changed. And send it to the
1190 * target netisr.
1191 *
1192 * NOTE: so_port MUST NOT be checked in the target
1193 * netisr.
1194 */
1195 smsg = &m->m_hdr.mh_sndmsg;
1196 netmsg_init(&smsg->base, so, &netisr_apanic_rport,
1197 MSGF_IGNSOPORT, udp_send_redispatch);
1198 smsg->nm_priv = flags; /* ip_output flags */
1199 smsg->nm_flags = pru_flags;
1200 smsg->nm_m = m;
1201 smsg->nm_control = m_opt; /* XXX save ipopt */
1202 lwkt_sendmsg(port, &smsg->base.lmsg);
1203 }
1204
1205 /* This UDP datagram is redispatched; done */
1206 logudp(send_redisp, inp);
1207 return;
1208 }
1209
1210 sendit:
1211 logudp(send_ipout, inp);
1212 error = ip_output(m, inp->inp_options, &inp->inp_route, flags,
1213 inp->inp_moptions, inp);
1214 m = NULL;
1215
1216 release:
1217 if (m != NULL)
1218 m_freem(m);
1219 if (control != NULL)
1220 m_freem(control);
1221
1222 if (pru_flags & PRUS_HELDTD)
1223 lwkt_rele(td);
1224 if (pru_flags & PRUS_FREEADDR)
1225 kfree(dstaddr, M_SONAME);
1226 if ((pru_flags & PRUS_NOREPLY) == 0)
1227 lwkt_replymsg(&msg->send.base.lmsg, error);
1228
1229 logudp(send_end, inp);
1230 }
1231
1232 u_long udp_sendspace = 9216; /* really max datagram size */
1233 /* 40 1K datagrams */
1234 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
1235 &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
1236
1237 u_long udp_recvspace = 40 * (1024 +
1238 #ifdef INET6
1239 sizeof(struct sockaddr_in6)
1240 #else
1241 sizeof(struct sockaddr_in)
1242 #endif
1243 );
1244 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1245 &udp_recvspace, 0, "Maximum incoming UDP datagram size");
1246
1247 /*
1248 * This should never happen, since UDP socket does not support
1249 * connection acception (SO_ACCEPTCONN, i.e. listen(2)).
1250 */
1251 static void
udp_abort(netmsg_t msg __unused)1252 udp_abort(netmsg_t msg __unused)
1253 {
1254 panic("udp_abort is called");
1255 }
1256
1257 static int
udp_preattach(struct socket * so,int proto __unused,struct pru_attach_info * ai)1258 udp_preattach(struct socket *so, int proto __unused, struct pru_attach_info *ai)
1259 {
1260 return soreserve(so, udp_sendspace, udp_recvspace, ai->sb_rlimit);
1261 }
1262
1263 static void
udp_attach(netmsg_t msg)1264 udp_attach(netmsg_t msg)
1265 {
1266 struct socket *so = msg->attach.base.nm_so;
1267 struct pru_attach_info *ai = msg->attach.nm_ai;
1268 struct inpcb *inp;
1269 int error;
1270
1271 KASSERT(so->so_pcb == NULL, ("udp socket attached"));
1272
1273 if (ai != NULL) {
1274 error = udp_preattach(so, 0 /* don't care */, ai);
1275 if (error)
1276 goto out;
1277 } else {
1278 /* Post attach; do nothing */
1279 }
1280
1281 error = in_pcballoc(so, &udbinfo[mycpuid]);
1282 if (error)
1283 goto out;
1284
1285 inp = so->so_pcb;
1286 inp->inp_flags |= INP_DIRECT_DETACH;
1287 inp->inp_ip_ttl = ip_defttl;
1288 error = 0;
1289 out:
1290 lwkt_replymsg(&msg->attach.base.lmsg, error);
1291 }
1292
1293 static void
udp_inswildcard_replymsg(netmsg_t msg)1294 udp_inswildcard_replymsg(netmsg_t msg)
1295 {
1296 lwkt_msg_t lmsg = &msg->lmsg;
1297
1298 if (lmsg->ms_flags & MSGF_UDP_SEND) {
1299 udp_send(msg);
1300 /* msg is replied by udp_send() */
1301 } else {
1302 lwkt_replymsg(lmsg, lmsg->ms_error);
1303 }
1304 }
1305
1306 static void
udp_soreuseport_dispatch(netmsg_t msg)1307 udp_soreuseport_dispatch(netmsg_t msg)
1308 {
1309 /* This inpcb has already been in the wildcard hash. */
1310 in_pcblink_flags(msg->base.nm_so->so_pcb, &udbinfo[mycpuid], 0);
1311 udp_inswildcard_replymsg(msg);
1312 }
1313
1314 static void
udp_sosetport(struct lwkt_msg * msg,lwkt_port_t port)1315 udp_sosetport(struct lwkt_msg *msg, lwkt_port_t port)
1316 {
1317 sosetport(((struct netmsg_base *)msg)->nm_so, port);
1318 }
1319
1320 static boolean_t
udp_inswildcardhash_oncpu(struct inpcb * inp,struct netmsg_base * msg)1321 udp_inswildcardhash_oncpu(struct inpcb *inp, struct netmsg_base *msg)
1322 {
1323 int cpu;
1324
1325 KASSERT(inp->inp_pcbinfo == &udbinfo[mycpuid],
1326 ("not on owner cpu"));
1327
1328 in_pcbinswildcardhash(inp);
1329 for (cpu = 0; cpu < netisr_ncpus; ++cpu) {
1330 if (cpu == mycpuid) {
1331 /*
1332 * This inpcb has been inserted by the above
1333 * in_pcbinswildcardhash().
1334 */
1335 continue;
1336 }
1337 in_pcbinswildcardhash_oncpu(inp, &udbinfo[cpu]);
1338 }
1339
1340 /* NOTE: inp_lgrpindex is _not_ assigned in jail. */
1341 if ((inp->inp_socket->so_options & SO_REUSEPORT) &&
1342 inp->inp_lgrpindex >= 0) {
1343 /*
1344 * For SO_REUSEPORT socket, redistribute it based on its
1345 * local group index.
1346 */
1347 cpu = inp->inp_lgrpindex % netisr_ncpus;
1348 if (cpu != mycpuid) {
1349 struct lwkt_port *port = netisr_cpuport(cpu);
1350 lwkt_msg_t lmsg = &msg->lmsg;
1351
1352 /*
1353 * We are moving the protocol processing port the
1354 * socket is on, we have to unlink here and re-link
1355 * on the target cpu (this inpcb is still left in
1356 * the wildcard hash).
1357 */
1358 in_pcbunlink_flags(inp, &udbinfo[mycpuid], 0);
1359 msg->nm_dispatch = udp_soreuseport_dispatch;
1360
1361 /*
1362 * See the related comment in tcp_usrreq.c
1363 * tcp_connect()
1364 */
1365 lwkt_setmsg_receipt(lmsg, udp_sosetport);
1366 lwkt_forwardmsg(port, lmsg);
1367 return TRUE; /* forwarded */
1368 }
1369 }
1370 return FALSE;
1371 }
1372
1373 static void
udp_inswildcardhash_dispatch(netmsg_t msg)1374 udp_inswildcardhash_dispatch(netmsg_t msg)
1375 {
1376 struct inpcb *inp = msg->base.nm_so->so_pcb;
1377 boolean_t forwarded;
1378
1379 KASSERT(inp->inp_lport != 0, ("local port not set yet"));
1380 KASSERT(udp_lportcpu(inp->inp_lport) == mycpuid, ("not target cpu"));
1381
1382 in_pcblink(inp, &udbinfo[mycpuid]);
1383
1384 forwarded = udp_inswildcardhash_oncpu(inp, &msg->base);
1385 if (forwarded) {
1386 /* The message is further forwarded, so we are done here. */
1387 return;
1388 }
1389 udp_inswildcard_replymsg(msg);
1390 }
1391
1392 static boolean_t
udp_inswildcardhash(struct inpcb * inp,struct netmsg_base * msg,int error)1393 udp_inswildcardhash(struct inpcb *inp, struct netmsg_base *msg, int error)
1394 {
1395 lwkt_msg_t lmsg = &msg->lmsg;
1396 int cpu;
1397
1398 ASSERT_INP_NOTINHASH(inp);
1399
1400 /* This inpcb could no longer be directly detached */
1401 inp->inp_flags &= ~INP_DIRECT_DETACH;
1402
1403 /*
1404 * Always clear the route cache, so we don't need to
1405 * worry about any owner CPU changes later.
1406 */
1407 in_pcbresetroute(inp);
1408
1409 KASSERT(inp->inp_lport != 0, ("local port not set yet"));
1410 cpu = udp_lportcpu(inp->inp_lport);
1411
1412 lmsg->ms_error = error;
1413 if (cpu != mycpuid) {
1414 struct lwkt_port *port = netisr_cpuport(cpu);
1415
1416 /*
1417 * We are moving the protocol processing port the socket
1418 * is on, we have to unlink here and re-link on the
1419 * target cpu.
1420 */
1421 in_pcbunlink(inp, &udbinfo[mycpuid]);
1422 msg->nm_dispatch = udp_inswildcardhash_dispatch;
1423
1424 /* See the related comment in tcp_usrreq.c tcp_connect() */
1425 lwkt_setmsg_receipt(lmsg, udp_sosetport);
1426 lwkt_forwardmsg(port, lmsg);
1427 return TRUE; /* forwarded */
1428 }
1429
1430 return udp_inswildcardhash_oncpu(inp, msg);
1431 }
1432
1433 static void
udp_bind(netmsg_t msg)1434 udp_bind(netmsg_t msg)
1435 {
1436 struct socket *so = msg->bind.base.nm_so;
1437 struct inpcb *inp;
1438 int error;
1439
1440 inp = so->so_pcb;
1441 if (inp) {
1442 struct sockaddr *nam = msg->bind.nm_nam;
1443 struct thread *td = msg->bind.nm_td;
1444 struct sockaddr_in *sin;
1445 lwkt_port_t port;
1446 int cpu;
1447
1448 /*
1449 * Check "already bound" here (in_pcbbind() does the same
1450 * check though), so we don't forward a connected/bound
1451 * socket randomly which would panic in the following
1452 * in_pcbunlink().
1453 */
1454 if (inp->inp_lport != 0 ||
1455 inp->inp_laddr.s_addr != INADDR_ANY) {
1456 error = EINVAL; /* already bound */
1457 goto done;
1458 }
1459
1460 if (nam->sa_len != sizeof(*sin)) {
1461 error = EINVAL;
1462 goto done;
1463 }
1464 sin = (struct sockaddr_in *)nam;
1465
1466 cpu = udp_lportcpu(sin->sin_port);
1467 port = netisr_cpuport(cpu);
1468
1469 /*
1470 * See the related comment in tcp_usrreq.c tcp_usr_bind().
1471 * The exception is that we use local port based netisr
1472 * to serialize in_pcbbind().
1473 */
1474 if (&curthread->td_msgport != port) {
1475 lwkt_msg_t lmsg = &msg->bind.base.lmsg;
1476
1477 KASSERT((msg->bind.nm_flags & PRUB_RELINK) == 0,
1478 ("already asked to relink"));
1479
1480 in_pcbunlink(so->so_pcb, &udbinfo[mycpuid]);
1481 msg->bind.nm_flags |= PRUB_RELINK;
1482
1483 /*
1484 * See the related comment in tcp_usrreq.c
1485 * tcp_connect().
1486 */
1487 lwkt_setmsg_receipt(lmsg, udp_sosetport);
1488 lwkt_forwardmsg(port, lmsg);
1489 /* msg invalid now */
1490 return;
1491 }
1492 KASSERT(so->so_port == port, ("so_port is not netisr%d", cpu));
1493
1494 if (msg->bind.nm_flags & PRUB_RELINK) {
1495 msg->bind.nm_flags &= ~PRUB_RELINK;
1496 in_pcblink(so->so_pcb, &udbinfo[mycpuid]);
1497 }
1498 KASSERT(inp->inp_pcbinfo == &udbinfo[cpu],
1499 ("pcbinfo is not udbinfo%d", cpu));
1500
1501 error = in_pcbbind(inp, nam, td);
1502 if (error == 0) {
1503 boolean_t forwarded;
1504
1505 if (sin->sin_addr.s_addr != INADDR_ANY)
1506 inp->inp_flags |= INP_WASBOUND_NOTANY;
1507
1508 forwarded = udp_inswildcardhash(inp,
1509 &msg->bind.base, 0);
1510 if (forwarded) {
1511 /*
1512 * The message is further forwarded, so
1513 * we are done here.
1514 */
1515 return;
1516 }
1517 }
1518 } else {
1519 error = EINVAL;
1520 }
1521 done:
1522 lwkt_replymsg(&msg->bind.base.lmsg, error);
1523 }
1524
1525 static int
udp_preconnect(struct socket * so,const struct sockaddr * nam __unused,struct thread * td __unused)1526 udp_preconnect(struct socket *so, const struct sockaddr *nam __unused,
1527 struct thread *td __unused)
1528 {
1529 sosetstate(so, SS_ISCONNECTED); /* XXX */
1530 return 0;
1531 }
1532
1533 static void
udp_connect(netmsg_t msg)1534 udp_connect(netmsg_t msg)
1535 {
1536 struct socket *so = msg->connect.base.nm_so;
1537 struct sockaddr *nam = msg->connect.nm_nam;
1538 struct thread *td = msg->connect.nm_td;
1539 struct inpcb *inp;
1540 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1541 struct sockaddr_in *if_sin;
1542 struct lwkt_port *port;
1543 uint16_t hash;
1544 int error;
1545
1546 KKASSERT(msg->connect.nm_m == NULL);
1547
1548 inp = so->so_pcb;
1549 if (inp == NULL) {
1550 error = EINVAL;
1551 goto out;
1552 }
1553
1554 if (msg->connect.nm_flags & PRUC_RECONNECT) {
1555 msg->connect.nm_flags &= ~PRUC_RECONNECT;
1556 in_pcblink(inp, &udbinfo[mycpuid]);
1557 }
1558
1559 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1560 error = EISCONN;
1561 goto out;
1562 }
1563 error = 0;
1564
1565 /*
1566 * Bind if we have to
1567 */
1568 if (inp->inp_lport == 0) {
1569 error = in_pcbbind(inp, NULL, td);
1570 if (error)
1571 goto out;
1572 }
1573
1574 /*
1575 * Calculate the correct protocol processing thread. The connect
1576 * operation must run there.
1577 */
1578 error = in_pcbladdr(inp, nam, &if_sin, td);
1579 if (error)
1580 goto out;
1581
1582 hash = udp_addrhash(sin->sin_addr.s_addr, sin->sin_port,
1583 inp->inp_laddr.s_addr != INADDR_ANY ?
1584 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr, inp->inp_lport);
1585 port = netisr_hashport(hash);
1586 if (port != &curthread->td_msgport) {
1587 lwkt_msg_t lmsg = &msg->connect.base.lmsg;
1588 int nm_flags = PRUC_RECONNECT;
1589
1590 /*
1591 * in_pcbladdr() may have allocated a route entry for us
1592 * on the current CPU, but we need a route entry on the
1593 * inpcb's owner CPU, so free it here.
1594 */
1595 in_pcbresetroute(inp);
1596
1597 if (inp->inp_flags & INP_WILDCARD) {
1598 /*
1599 * Remove this inpcb from the wildcard hash before
1600 * the socket's msgport changes.
1601 */
1602 udp_remwildcardhash(inp);
1603 }
1604
1605 if (so->so_orig_port == NULL) {
1606 /*
1607 * First time change protocol processing port.
1608 * Save the current port for synchronization upon
1609 * udp_detach.
1610 */
1611 so->so_orig_port = &curthread->td_msgport;
1612 } else {
1613 /*
1614 * We have changed protocol processing port more
1615 * than once. We could not do direct detach
1616 * anymore, because we lose the track of the
1617 * original protocol processing ports to perform
1618 * synchronization upon udp_detach. This should
1619 * be rare though.
1620 */
1621 inp->inp_flags &= ~INP_DIRECT_DETACH;
1622 }
1623
1624 /*
1625 * We are moving the protocol processing port the socket
1626 * is on, we have to unlink here and re-link on the
1627 * target cpu.
1628 */
1629 in_pcbunlink(inp, &udbinfo[mycpuid]);
1630 msg->connect.nm_flags |= nm_flags;
1631
1632 /* See the related comment in tcp_usrreq.c tcp_connect() */
1633 lwkt_setmsg_receipt(lmsg, udp_sosetport);
1634 lwkt_forwardmsg(port, lmsg);
1635 /* msg invalid now */
1636 return;
1637 }
1638 error = udp_connect_oncpu(inp, sin, if_sin, hash);
1639 out:
1640 if (msg->connect.nm_flags & PRUC_HELDTD)
1641 lwkt_rele(td);
1642 if (error && (msg->connect.nm_flags & PRUC_ASYNC)) {
1643 if (inp->inp_lport == 0) {
1644 /*
1645 * As long as we have the local port, it is fine
1646 * for connect to fail, e.g. disconnect.
1647 */
1648 so->so_error = error;
1649 }
1650 soclrstate(so, SS_ISCONNECTED);
1651 /*
1652 * Wake up callers blocked on this socket to make sure
1653 * that they can see this error.
1654 *
1655 * NOTE:
1656 * sodisconnected() can't be used here, which bricks
1657 * sending and receiving.
1658 */
1659 wakeup(&so->so_timeo);
1660 sowwakeup(so);
1661 sorwakeup(so);
1662 }
1663 if (error && inp != NULL && inp->inp_lport != 0 &&
1664 (inp->inp_flags & INP_WILDCARD) == 0) {
1665 boolean_t forwarded;
1666
1667 /* Connect failed; put it to wildcard hash. */
1668 forwarded = udp_inswildcardhash(inp, &msg->connect.base,
1669 error);
1670 if (forwarded) {
1671 /*
1672 * The message is further forwarded, so we are done
1673 * here.
1674 */
1675 return;
1676 }
1677 }
1678 lwkt_replymsg(&msg->connect.base.lmsg, error);
1679 }
1680
1681 static void
udp_remwildcardhash(struct inpcb * inp)1682 udp_remwildcardhash(struct inpcb *inp)
1683 {
1684 int cpu;
1685
1686 KASSERT(inp->inp_pcbinfo == &udbinfo[mycpuid],
1687 ("not on owner cpu"));
1688
1689 for (cpu = 0; cpu < netisr_ncpus; ++cpu) {
1690 if (cpu == mycpuid) {
1691 /*
1692 * This inpcb will be removed by the later
1693 * in_pcbremwildcardhash().
1694 */
1695 continue;
1696 }
1697 in_pcbremwildcardhash_oncpu(inp, &udbinfo[cpu]);
1698 }
1699 in_pcbremwildcardhash(inp);
1700 }
1701
1702 static int
udp_connect_oncpu(struct inpcb * inp,struct sockaddr_in * sin,struct sockaddr_in * if_sin,uint16_t hash)1703 udp_connect_oncpu(struct inpcb *inp, struct sockaddr_in *sin,
1704 struct sockaddr_in *if_sin, uint16_t hash)
1705 {
1706 struct socket *so = inp->inp_socket;
1707 struct inpcb *oinp;
1708
1709 oinp = in_pcblookup_hash(inp->inp_pcbinfo,
1710 sin->sin_addr, sin->sin_port,
1711 inp->inp_laddr.s_addr != INADDR_ANY ?
1712 inp->inp_laddr : if_sin->sin_addr, inp->inp_lport, FALSE, NULL);
1713 if (oinp != NULL)
1714 return EADDRINUSE;
1715
1716 /*
1717 * No more errors can occur, finish adjusting the socket
1718 * and change the processing port to reflect the connected
1719 * socket. Once set we can no longer safely mess with the
1720 * socket.
1721 */
1722
1723 if (inp->inp_flags & INP_WILDCARD)
1724 udp_remwildcardhash(inp);
1725
1726 if (inp->inp_laddr.s_addr == INADDR_ANY)
1727 inp->inp_laddr = if_sin->sin_addr;
1728 inp->inp_faddr = sin->sin_addr;
1729 inp->inp_fport = sin->sin_port;
1730 in_pcbinsconnhash(inp);
1731
1732 inp->inp_flags |= INP_HASH;
1733 inp->inp_hashval = hash;
1734
1735 soisconnected(so);
1736
1737 return 0;
1738 }
1739
1740 static void
udp_detach2(struct socket * so)1741 udp_detach2(struct socket *so)
1742 {
1743 in_pcbdetach(so->so_pcb);
1744 sodiscard(so);
1745 sofree(so);
1746 }
1747
1748 static void
udp_detach_final_dispatch(netmsg_t msg)1749 udp_detach_final_dispatch(netmsg_t msg)
1750 {
1751 udp_detach2(msg->base.nm_so);
1752 }
1753
1754 static void
udp_detach_oncpu_dispatch(netmsg_t msg)1755 udp_detach_oncpu_dispatch(netmsg_t msg)
1756 {
1757 struct netmsg_base *clomsg = &msg->base;
1758 struct socket *so = clomsg->nm_so;
1759 struct inpcb *inp = so->so_pcb;
1760 struct thread *td = curthread;
1761 int nextcpu, cpuid = mycpuid;
1762
1763 KASSERT(td->td_type == TD_TYPE_NETISR, ("not in netisr"));
1764
1765 if (inp->inp_flags & INP_WILDCARD) {
1766 /*
1767 * This inp will be removed on the inp's
1768 * owner CPU later, so don't do it now.
1769 */
1770 if (&td->td_msgport != so->so_port)
1771 in_pcbremwildcardhash_oncpu(inp, &udbinfo[cpuid]);
1772 }
1773
1774 if (cpuid == 0) {
1775 /*
1776 * Free and clear multicast socket option,
1777 * which is only accessed in netisr0.
1778 */
1779 ip_freemoptions(inp->inp_moptions);
1780 inp->inp_moptions = NULL;
1781 }
1782
1783 nextcpu = cpuid + 1;
1784 if (nextcpu < netisr_ncpus) {
1785 lwkt_forwardmsg(netisr_cpuport(nextcpu), &clomsg->lmsg);
1786 } else {
1787 /*
1788 * No one could see this inpcb now; destroy this
1789 * inpcb in its owner netisr.
1790 */
1791 netmsg_init(clomsg, so, &netisr_apanic_rport, 0,
1792 udp_detach_final_dispatch);
1793 lwkt_sendmsg(so->so_port, &clomsg->lmsg);
1794 }
1795 }
1796
1797 static void
udp_detach_syncorig_dispatch(netmsg_t msg)1798 udp_detach_syncorig_dispatch(netmsg_t msg)
1799 {
1800 struct netmsg_base *clomsg = &msg->base;
1801 struct socket *so = clomsg->nm_so;
1802
1803 /*
1804 * Original protocol processing port is synchronized;
1805 * destroy this inpcb in its owner netisr.
1806 */
1807 netmsg_init(clomsg, so, &netisr_apanic_rport, 0,
1808 udp_detach_final_dispatch);
1809 lwkt_sendmsg(so->so_port, &clomsg->lmsg);
1810 }
1811
1812 static void
udp_detach(netmsg_t msg)1813 udp_detach(netmsg_t msg)
1814 {
1815 struct socket *so = msg->detach.base.nm_so;
1816 struct netmsg_base *clomsg;
1817 struct inpcb *inp;
1818
1819 inp = so->so_pcb;
1820 if (inp == NULL) {
1821 lwkt_replymsg(&msg->detach.base.lmsg, EINVAL);
1822 return;
1823 }
1824
1825 /*
1826 * Reply EJUSTRETURN ASAP, we will call sodiscard() and
1827 * sofree() later.
1828 */
1829 lwkt_replymsg(&msg->detach.base.lmsg, EJUSTRETURN);
1830
1831 if (netisr_ncpus == 1) {
1832 /* Only one CPU, detach the inpcb directly. */
1833 udp_detach2(so);
1834 return;
1835 }
1836
1837 /*
1838 * Remove this inpcb from the inpcb list first, so that
1839 * no one could find this inpcb from the inpcb list.
1840 */
1841 in_pcbofflist(inp);
1842
1843 /*
1844 * Remove this inpcb from the local port hash directly
1845 * here, so that its bound local port could be recycled
1846 * timely.
1847 */
1848 in_pcbremporthash(inp);
1849
1850 if (inp->inp_flags & INP_DIRECT_DETACH) {
1851 /*
1852 * Direct detaching is allowed
1853 */
1854 KASSERT((inp->inp_flags & INP_WILDCARD) == 0,
1855 ("in the wildcardhash"));
1856 KASSERT(inp->inp_moptions == NULL, ("has mcast options"));
1857 if (so->so_orig_port == NULL) {
1858 udp_detach2(so);
1859 } else {
1860 /*
1861 * Protocol processing port changed once, so
1862 * we need to make sure that there are nothing
1863 * left on the original protocol processing
1864 * port before we destroy this socket and inpcb.
1865 * This is more lightweight than going through
1866 * all UDP processing netisrs.
1867 */
1868 clomsg = &so->so_clomsg;
1869 netmsg_init(clomsg, so, &netisr_apanic_rport,
1870 MSGF_IGNSOPORT, udp_detach_syncorig_dispatch);
1871 lwkt_sendmsg(so->so_orig_port, &clomsg->lmsg);
1872 }
1873 return;
1874 }
1875
1876 /*
1877 * Go through netisrs which process UDP to make sure
1878 * no one could find this inpcb anymore.
1879 */
1880 clomsg = &so->so_clomsg;
1881 netmsg_init(clomsg, so, &netisr_apanic_rport, MSGF_IGNSOPORT,
1882 udp_detach_oncpu_dispatch);
1883 lwkt_sendmsg(netisr_cpuport(0), &clomsg->lmsg);
1884 }
1885
1886 static void
udp_disconnect(netmsg_t msg)1887 udp_disconnect(netmsg_t msg)
1888 {
1889 struct socket *so = msg->disconnect.base.nm_so;
1890 struct inpcb *inp;
1891 boolean_t forwarded;
1892 int error = 0;
1893
1894 inp = so->so_pcb;
1895 if (inp == NULL) {
1896 error = EINVAL;
1897 goto out;
1898 }
1899 if (inp->inp_faddr.s_addr == INADDR_ANY) {
1900 error = ENOTCONN;
1901 goto out;
1902 }
1903
1904 soclrstate(so, SS_ISCONNECTED); /* XXX */
1905
1906 in_pcbdisconnect(inp);
1907 inp->inp_flags &= ~INP_HASH;
1908
1909 /*
1910 * Follow traditional BSD behavior and retain the local port
1911 * binding. But, fix the old misbehavior of overwriting any
1912 * previously bound local address.
1913 */
1914 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
1915 inp->inp_laddr.s_addr = INADDR_ANY;
1916
1917 if (so->so_state & SS_ISCLOSING) {
1918 /*
1919 * If this socket is being closed, there is no need
1920 * to put this socket back into wildcard hash table.
1921 */
1922 error = 0;
1923 goto out;
1924 }
1925
1926 forwarded = udp_inswildcardhash(inp, &msg->disconnect.base, 0);
1927 if (forwarded) {
1928 /*
1929 * The message is further forwarded, so we are done
1930 * here.
1931 */
1932 return;
1933 }
1934 out:
1935 lwkt_replymsg(&msg->disconnect.base.lmsg, error);
1936 }
1937
1938 void
udp_shutdown(netmsg_t msg)1939 udp_shutdown(netmsg_t msg)
1940 {
1941 struct socket *so = msg->shutdown.base.nm_so;
1942 struct inpcb *inp;
1943 int error;
1944
1945 inp = so->so_pcb;
1946 if (inp) {
1947 socantsendmore(so);
1948 error = 0;
1949 } else {
1950 error = EINVAL;
1951 }
1952 lwkt_replymsg(&msg->shutdown.base.lmsg, error);
1953 }
1954
1955 struct pr_usrreqs udp_usrreqs = {
1956 .pru_abort = udp_abort,
1957 .pru_accept = pr_generic_notsupp,
1958 .pru_attach = udp_attach,
1959 .pru_bind = udp_bind,
1960 .pru_connect = udp_connect,
1961 .pru_connect2 = pr_generic_notsupp,
1962 .pru_control = in_control_dispatch,
1963 .pru_detach = udp_detach,
1964 .pru_disconnect = udp_disconnect,
1965 .pru_listen = pr_generic_notsupp,
1966 .pru_peeraddr = in_setpeeraddr_dispatch,
1967 .pru_rcvd = pr_generic_notsupp,
1968 .pru_rcvoob = pr_generic_notsupp,
1969 .pru_send = udp_send,
1970 .pru_sense = pru_sense_null,
1971 .pru_shutdown = udp_shutdown,
1972 .pru_sockaddr = in_setsockaddr_dispatch,
1973 .pru_sosend = sosendudp,
1974 .pru_soreceive = soreceive,
1975 .pru_preconnect = udp_preconnect,
1976 .pru_preattach = udp_preattach
1977 };
1978