1 /*
2 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
34 * $FreeBSD: releng/5.0/sys/netinet/udp_usrreq.c 107113 2002-11-20 19:00:54Z luigi $
35 */
36
37 #include "opt_ipsec.h"
38 #include "opt_inet6.h"
39 #include "opt_mac.h"
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/domain.h>
44 #include <sys/jail.h>
45 #include <sys/kernel.h>
46 #include <sys/lock.h>
47 #include <sys/mac.h>
48 #include <sys/malloc.h>
49 #include <sys/mbuf.h>
50 #include <sys/proc.h>
51 #include <sys/protosw.h>
52 #include <sys/signalvar.h>
53 #include <sys/socket.h>
54 #include <sys/socketvar.h>
55 #include <sys/sx.h>
56 #include <sys/sysctl.h>
57 #include <sys/syslog.h>
58
59 #include <vm/uma.h>
60
61 #include <net/if.h>
62 #include <net/route.h>
63
64 #include <netinet/in.h>
65 #include <netinet/in_systm.h>
66 #include <netinet/in_pcb.h>
67 #include <netinet/in_var.h>
68 #include <netinet/ip.h>
69 #ifdef INET6
70 #include <netinet/ip6.h>
71 #endif
72 #include <netinet/ip_icmp.h>
73 #include <netinet/icmp_var.h>
74 #include <netinet/ip_var.h>
75 #ifdef INET6
76 #include <netinet6/ip6_var.h>
77 #endif
78 #include <netinet/udp.h>
79 #include <netinet/udp_var.h>
80
81 #ifdef FAST_IPSEC
82 #include <netipsec/ipsec.h>
83 #endif /*FAST_IPSEC*/
84
85 #ifdef IPSEC
86 #include <netinet6/ipsec.h>
87 #endif /*IPSEC*/
88
89 #include <machine/in_cksum.h>
90
91 /*
92 * UDP protocol implementation.
93 * Per RFC 768, August, 1980.
94 */
95 #ifndef COMPAT_42
96 static int udpcksum = 1;
97 #else
98 static int udpcksum = 0; /* XXX */
99 #endif
100 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
101 &udpcksum, 0, "");
102
103 int log_in_vain = 0;
104 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
105 &log_in_vain, 0, "Log all incoming UDP packets");
106
107 static int blackhole = 0;
108 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW,
109 &blackhole, 0, "Do not send port unreachables for refused connects");
110
111 struct inpcbhead udb; /* from udp_var.h */
112 #define udb6 udb /* for KAME src sync over BSD*'s */
113 struct inpcbinfo udbinfo;
114
115 #ifndef UDBHASHSIZE
116 #define UDBHASHSIZE 16
117 #endif
118
119 struct udpstat udpstat; /* from udp_var.h */
120 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW,
121 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
122
123 static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
124 #ifdef INET6
125 struct udp_in6 {
126 struct sockaddr_in6 uin6_sin;
127 u_char uin6_init_done : 1;
128 } udp_in6 = {
129 { sizeof(udp_in6.uin6_sin), AF_INET6 },
130 0
131 };
132 struct udp_ip6 {
133 struct ip6_hdr uip6_ip6;
134 u_char uip6_init_done : 1;
135 } udp_ip6;
136 #endif /* INET6 */
137
138 static void udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n,
139 int off);
140 #ifdef INET6
141 static void ip_2_ip6_hdr(struct ip6_hdr *ip6, struct ip *ip);
142 #endif
143
144 static int udp_detach(struct socket *so);
145 static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
146 struct mbuf *, struct thread *);
147
148 void
149 udp_init()
150 {
151 INP_INFO_LOCK_INIT(&udbinfo, "udp");
152 LIST_INIT(&udb);
153 udbinfo.listhead = &udb;
154 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask);
155 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB,
156 &udbinfo.porthashmask);
157 udbinfo.ipi_zone = uma_zcreate("udpcb", sizeof(struct inpcb), NULL,
158 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
159 uma_zone_set_max(udbinfo.ipi_zone, maxsockets);
160 }
161
162 void
163 udp_input(m, off)
164 register struct mbuf *m;
165 int off;
166 {
167 int iphlen = off;
168 register struct ip *ip;
169 register struct udphdr *uh;
170 register struct inpcb *inp;
171 struct mbuf *opts = 0;
172 int len;
173 struct ip save_ip;
174
175 udpstat.udps_ipackets++;
176
177 /*
178 * Strip IP options, if any; should skip this,
179 * make available to user, and use on returned packets,
180 * but we don't yet have a way to check the checksum
181 * with options still present.
182 */
183 if (iphlen > sizeof (struct ip)) {
184 ip_stripoptions(m, (struct mbuf *)0);
185 iphlen = sizeof(struct ip);
186 }
187
188 /*
189 * Get IP and UDP header together in first mbuf.
190 */
191 ip = mtod(m, struct ip *);
192 if (m->m_len < iphlen + sizeof(struct udphdr)) {
193 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
194 udpstat.udps_hdrops++;
195 return;
196 }
197 ip = mtod(m, struct ip *);
198 }
199 uh = (struct udphdr *)((caddr_t)ip + iphlen);
200
201 /* destination port of 0 is illegal, based on RFC768. */
202 if (uh->uh_dport == 0)
203 goto badunlocked;
204
205 /*
206 * Construct sockaddr format source address.
207 * Stuff source address and datagram in user buffer.
208 */
209 udp_in.sin_port = uh->uh_sport;
210 udp_in.sin_addr = ip->ip_src;
211 #ifdef INET6
212 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0;
213 #endif
214
215 /*
216 * Make mbuf data length reflect UDP length.
217 * If not enough data to reflect UDP length, drop.
218 */
219 len = ntohs((u_short)uh->uh_ulen);
220 if (ip->ip_len != len) {
221 if (len > ip->ip_len || len < sizeof(struct udphdr)) {
222 udpstat.udps_badlen++;
223 goto badunlocked;
224 }
225 m_adj(m, len - ip->ip_len);
226 /* ip->ip_len = len; */
227 }
228 /*
229 * Save a copy of the IP header in case we want restore it
230 * for sending an ICMP error message in response.
231 */
232 if (!blackhole)
233 save_ip = *ip;
234
235 /*
236 * Checksum extended UDP header and data.
237 */
238 if (uh->uh_sum) {
239 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
240 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
241 uh->uh_sum = m->m_pkthdr.csum_data;
242 else
243 uh->uh_sum = in_pseudo(ip->ip_src.s_addr,
244 ip->ip_dst.s_addr, htonl((u_short)len +
245 m->m_pkthdr.csum_data + IPPROTO_UDP));
246 uh->uh_sum ^= 0xffff;
247 } else {
248 char b[9];
249 bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
250 bzero(((struct ipovly *)ip)->ih_x1, 9);
251 ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
252 uh->uh_sum = in_cksum(m, len + sizeof (struct ip));
253 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
254 }
255 if (uh->uh_sum) {
256 udpstat.udps_badsum++;
257 m_freem(m);
258 return;
259 }
260 } else
261 udpstat.udps_nosum++;
262
263 INP_INFO_RLOCK(&udbinfo);
264
265 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
266 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
267 struct inpcb *last;
268 /*
269 * Deliver a multicast or broadcast datagram to *all* sockets
270 * for which the local and remote addresses and ports match
271 * those of the incoming datagram. This allows more than
272 * one process to receive multi/broadcasts on the same port.
273 * (This really ought to be done for unicast datagrams as
274 * well, but that would cause problems with existing
275 * applications that open both address-specific sockets and
276 * a wildcard socket listening to the same port -- they would
277 * end up receiving duplicates of every unicast datagram.
278 * Those applications open the multiple sockets to overcome an
279 * inadequacy of the UDP socket interface, but for backwards
280 * compatibility we avoid the problem here rather than
281 * fixing the interface. Maybe 4.5BSD will remedy this?)
282 */
283
284 /*
285 * Locate pcb(s) for datagram.
286 * (Algorithm copied from raw_intr().)
287 */
288 last = NULL;
289 LIST_FOREACH(inp, &udb, inp_list) {
290 INP_LOCK(inp);
291 if (inp->inp_lport != uh->uh_dport) {
292 docontinue:
293 INP_UNLOCK(inp);
294 continue;
295 }
296 #ifdef INET6
297 if ((inp->inp_vflag & INP_IPV4) == 0)
298 goto docontinue;
299 #endif
300 if (inp->inp_laddr.s_addr != INADDR_ANY) {
301 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
302 goto docontinue;
303 }
304 if (inp->inp_faddr.s_addr != INADDR_ANY) {
305 if (inp->inp_faddr.s_addr !=
306 ip->ip_src.s_addr ||
307 inp->inp_fport != uh->uh_sport)
308 goto docontinue;
309 }
310
311 if (last != NULL) {
312 struct mbuf *n;
313
314 n = m_copy(m, 0, M_COPYALL);
315 if (n != NULL)
316 udp_append(last, ip, n,
317 iphlen +
318 sizeof(struct udphdr));
319 INP_UNLOCK(last);
320 }
321 last = inp;
322 /*
323 * Don't look for additional matches if this one does
324 * not have either the SO_REUSEPORT or SO_REUSEADDR
325 * socket options set. This heuristic avoids searching
326 * through all pcbs in the common case of a non-shared
327 * port. It * assumes that an application will never
328 * clear these options after setting them.
329 */
330 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0)
331 break;
332 }
333
334 if (last == NULL) {
335 /*
336 * No matching pcb found; discard datagram.
337 * (No need to send an ICMP Port Unreachable
338 * for a broadcast or multicast datgram.)
339 */
340 udpstat.udps_noportbcast++;
341 goto badheadlocked;
342 }
343 INP_INFO_RUNLOCK(&udbinfo);
344 udp_append(last, ip, m, iphlen + sizeof(struct udphdr));
345 INP_UNLOCK(last);
346 return;
347 }
348 /*
349 * Locate pcb for datagram.
350 */
351 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport,
352 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
353 if (inp == NULL) {
354 if (log_in_vain) {
355 char buf[4*sizeof "123"];
356
357 strcpy(buf, inet_ntoa(ip->ip_dst));
358 log(LOG_INFO,
359 "Connection attempt to UDP %s:%d from %s:%d\n",
360 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
361 ntohs(uh->uh_sport));
362 }
363 udpstat.udps_noport++;
364 if (m->m_flags & (M_BCAST | M_MCAST)) {
365 udpstat.udps_noportbcast++;
366 goto badheadlocked;
367 }
368 if (blackhole)
369 goto badheadlocked;
370 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
371 goto badheadlocked;
372 *ip = save_ip;
373 ip->ip_len += iphlen;
374 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
375 INP_INFO_RUNLOCK(&udbinfo);
376 return;
377 }
378 INP_LOCK(inp);
379 INP_INFO_RUNLOCK(&udbinfo);
380 udp_append(inp, ip, m, iphlen + sizeof(struct udphdr));
381 INP_UNLOCK(inp);
382 return;
383
384 badheadlocked:
385 INP_INFO_RUNLOCK(&udbinfo);
386 if (inp)
387 INP_UNLOCK(inp);
388 badunlocked:
389 m_freem(m);
390 if (opts)
391 m_freem(opts);
392 return;
393 }
394
395 #ifdef INET6
396 static void
397 ip_2_ip6_hdr(ip6, ip)
398 struct ip6_hdr *ip6;
399 struct ip *ip;
400 {
401 bzero(ip6, sizeof(*ip6));
402
403 ip6->ip6_vfc = IPV6_VERSION;
404 ip6->ip6_plen = ip->ip_len;
405 ip6->ip6_nxt = ip->ip_p;
406 ip6->ip6_hlim = ip->ip_ttl;
407 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] =
408 IPV6_ADDR_INT32_SMP;
409 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr;
410 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr;
411 }
412 #endif
413
414 /*
415 * subroutine of udp_input(), mainly for source code readability.
416 * caller must properly init udp_ip6 and udp_in6 beforehand.
417 */
418 static void
419 udp_append(last, ip, n, off)
420 struct inpcb *last;
421 struct ip *ip;
422 struct mbuf *n;
423 int off;
424 {
425 struct sockaddr *append_sa;
426 struct mbuf *opts = 0;
427
428 #ifdef IPSEC
429 /* check AH/ESP integrity. */
430 if (ipsec4_in_reject_so(n, last->inp_socket)) {
431 ipsecstat.in_polvio++;
432 m_freem(n);
433 return;
434 }
435 #endif /*IPSEC*/
436 #ifdef FAST_IPSEC
437 /* check AH/ESP integrity. */
438 if (ipsec4_in_reject(n, last)) {
439 m_freem(n);
440 return;
441 }
442 #endif /*FAST_IPSEC*/
443 #ifdef MAC
444 if (mac_check_socket_deliver(last->inp_socket, n) != 0) {
445 m_freem(n);
446 return;
447 }
448 #endif
449 if (last->inp_flags & INP_CONTROLOPTS ||
450 last->inp_socket->so_options & SO_TIMESTAMP) {
451 #ifdef INET6
452 if (last->inp_vflag & INP_IPV6) {
453 int savedflags;
454
455 if (udp_ip6.uip6_init_done == 0) {
456 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip);
457 udp_ip6.uip6_init_done = 1;
458 }
459 savedflags = last->inp_flags;
460 last->inp_flags &= ~INP_UNMAPPABLEOPTS;
461 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n);
462 last->inp_flags = savedflags;
463 } else
464 #endif
465 ip_savecontrol(last, &opts, ip, n);
466 }
467 #ifdef INET6
468 if (last->inp_vflag & INP_IPV6) {
469 if (udp_in6.uin6_init_done == 0) {
470 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin);
471 udp_in6.uin6_init_done = 1;
472 }
473 append_sa = (struct sockaddr *)&udp_in6.uin6_sin;
474 } else
475 #endif
476 append_sa = (struct sockaddr *)&udp_in;
477 m_adj(n, off);
478 if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) {
479 m_freem(n);
480 if (opts)
481 m_freem(opts);
482 udpstat.udps_fullsock++;
483 } else
484 sorwakeup(last->inp_socket);
485 }
486
487 /*
488 * Notify a udp user of an asynchronous error;
489 * just wake up so that he can collect error status.
490 */
491 struct inpcb *
492 udp_notify(inp, errno)
493 register struct inpcb *inp;
494 int errno;
495 {
496 inp->inp_socket->so_error = errno;
497 sorwakeup(inp->inp_socket);
498 sowwakeup(inp->inp_socket);
499 return inp;
500 }
501
502 void
503 udp_ctlinput(cmd, sa, vip)
504 int cmd;
505 struct sockaddr *sa;
506 void *vip;
507 {
508 struct ip *ip = vip;
509 struct udphdr *uh;
510 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
511 struct in_addr faddr;
512 struct inpcb *inp;
513 int s;
514
515 faddr = ((struct sockaddr_in *)sa)->sin_addr;
516 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
517 return;
518
519 if (PRC_IS_REDIRECT(cmd)) {
520 ip = 0;
521 notify = in_rtchange;
522 } else if (cmd == PRC_HOSTDEAD)
523 ip = 0;
524 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
525 return;
526 if (ip) {
527 s = splnet();
528 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
529 INP_INFO_RLOCK(&udbinfo);
530 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport,
531 ip->ip_src, uh->uh_sport, 0, NULL);
532 if (inp != NULL) {
533 INP_LOCK(inp);
534 if(inp->inp_socket != NULL) {
535 (*notify)(inp, inetctlerrmap[cmd]);
536 }
537 INP_UNLOCK(inp);
538 }
539 INP_INFO_RUNLOCK(&udbinfo);
540 splx(s);
541 } else
542 in_pcbnotifyall(&udbinfo, faddr, inetctlerrmap[cmd], notify);
543 }
544
545 static int
546 udp_pcblist(SYSCTL_HANDLER_ARGS)
547 {
548 int error, i, n, s;
549 struct inpcb *inp, **inp_list;
550 inp_gen_t gencnt;
551 struct xinpgen xig;
552
553 /*
554 * The process of preparing the TCB list is too time-consuming and
555 * resource-intensive to repeat twice on every request.
556 */
557 if (req->oldptr == 0) {
558 n = udbinfo.ipi_count;
559 req->oldidx = 2 * (sizeof xig)
560 + (n + n/8) * sizeof(struct xinpcb);
561 return 0;
562 }
563
564 if (req->newptr != 0)
565 return EPERM;
566
567 /*
568 * OK, now we're committed to doing something.
569 */
570 s = splnet();
571 gencnt = udbinfo.ipi_gencnt;
572 n = udbinfo.ipi_count;
573 splx(s);
574
575 sysctl_wire_old_buffer(req, 2 * (sizeof xig)
576 + n * sizeof(struct xinpcb));
577
578 xig.xig_len = sizeof xig;
579 xig.xig_count = n;
580 xig.xig_gen = gencnt;
581 xig.xig_sogen = so_gencnt;
582 error = SYSCTL_OUT(req, &xig, sizeof xig);
583 if (error)
584 return error;
585
586 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
587 if (inp_list == 0)
588 return ENOMEM;
589
590 s = splnet();
591 INP_INFO_RLOCK(&udbinfo);
592 for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n;
593 inp = LIST_NEXT(inp, inp_list)) {
594 INP_LOCK(inp);
595 if (inp->inp_gencnt <= gencnt &&
596 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0)
597 inp_list[i++] = inp;
598 INP_UNLOCK(inp);
599 }
600 INP_INFO_RUNLOCK(&udbinfo);
601 splx(s);
602 n = i;
603
604 error = 0;
605 for (i = 0; i < n; i++) {
606 inp = inp_list[i];
607 INP_LOCK(inp);
608 if (inp->inp_gencnt <= gencnt) {
609 struct xinpcb xi;
610 xi.xi_len = sizeof xi;
611 /* XXX should avoid extra copy */
612 bcopy(inp, &xi.xi_inp, sizeof *inp);
613 if (inp->inp_socket)
614 sotoxsocket(inp->inp_socket, &xi.xi_socket);
615 error = SYSCTL_OUT(req, &xi, sizeof xi);
616 }
617 INP_UNLOCK(inp);
618 }
619 if (!error) {
620 /*
621 * Give the user an updated idea of our state.
622 * If the generation differs from what we told
623 * her before, she knows that something happened
624 * while we were processing this request, and it
625 * might be necessary to retry.
626 */
627 s = splnet();
628 INP_INFO_RLOCK(&udbinfo);
629 xig.xig_gen = udbinfo.ipi_gencnt;
630 xig.xig_sogen = so_gencnt;
631 xig.xig_count = udbinfo.ipi_count;
632 INP_INFO_RUNLOCK(&udbinfo);
633 splx(s);
634 error = SYSCTL_OUT(req, &xig, sizeof xig);
635 }
636 free(inp_list, M_TEMP);
637 return error;
638 }
639
640 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0,
641 udp_pcblist, "S,xinpcb", "List of active UDP sockets");
642
643 static int
644 udp_getcred(SYSCTL_HANDLER_ARGS)
645 {
646 struct xucred xuc;
647 struct sockaddr_in addrs[2];
648 struct inpcb *inp;
649 int error, s;
650
651 error = suser_cred(req->td->td_ucred, PRISON_ROOT);
652 if (error)
653 return (error);
654 error = SYSCTL_IN(req, addrs, sizeof(addrs));
655 if (error)
656 return (error);
657 s = splnet();
658 INP_INFO_RLOCK(&udbinfo);
659 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
660 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL);
661 if (inp == NULL || inp->inp_socket == NULL) {
662 error = ENOENT;
663 goto out;
664 }
665 error = cr_canseesocket(req->td->td_ucred, inp->inp_socket);
666 if (error)
667 goto out;
668 cru2x(inp->inp_socket->so_cred, &xuc);
669 out:
670 INP_INFO_RUNLOCK(&udbinfo);
671 splx(s);
672 if (error == 0)
673 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
674 return (error);
675 }
676
677 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
678 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
679 udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
680
681 static int
682 udp_output(inp, m, addr, control, td)
683 register struct inpcb *inp;
684 struct mbuf *m;
685 struct sockaddr *addr;
686 struct mbuf *control;
687 struct thread *td;
688 {
689 register struct udpiphdr *ui;
690 register int len = m->m_pkthdr.len;
691 struct in_addr faddr, laddr;
692 struct cmsghdr *cm;
693 struct sockaddr_in *sin, src;
694 int error = 0;
695 u_short fport, lport;
696
697 #ifdef MAC
698 mac_create_mbuf_from_socket(inp->inp_socket, m);
699 #endif
700
701 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
702 error = EMSGSIZE;
703 if (control)
704 m_freem(control);
705 goto release;
706 }
707
708 src.sin_addr.s_addr = INADDR_ANY;
709 if (control != NULL) {
710 /*
711 * XXX: Currently, we assume all the optional information
712 * is stored in a single mbuf.
713 */
714 if (control->m_next) {
715 error = EINVAL;
716 m_freem(control);
717 goto release;
718 }
719 for (; control->m_len > 0;
720 control->m_data += CMSG_ALIGN(cm->cmsg_len),
721 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
722 cm = mtod(control, struct cmsghdr *);
723 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0 ||
724 cm->cmsg_len > control->m_len) {
725 error = EINVAL;
726 break;
727 }
728 if (cm->cmsg_level != IPPROTO_IP)
729 continue;
730
731 switch (cm->cmsg_type) {
732 case IP_SENDSRCADDR:
733 if (cm->cmsg_len !=
734 CMSG_LEN(sizeof(struct in_addr))) {
735 error = EINVAL;
736 break;
737 }
738 bzero(&src, sizeof(src));
739 src.sin_family = AF_INET;
740 src.sin_len = sizeof(src);
741 src.sin_port = inp->inp_lport;
742 src.sin_addr = *(struct in_addr *)CMSG_DATA(cm);
743 break;
744 default:
745 error = ENOPROTOOPT;
746 break;
747 }
748 if (error)
749 break;
750 }
751 m_freem(control);
752 }
753 if (error)
754 goto release;
755 laddr = inp->inp_laddr;
756 lport = inp->inp_lport;
757 if (src.sin_addr.s_addr != INADDR_ANY) {
758 if (lport == 0) {
759 error = EINVAL;
760 goto release;
761 }
762 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
763 &laddr.s_addr, &lport, td);
764 if (error)
765 goto release;
766 }
767
768 if (addr) {
769 sin = (struct sockaddr_in *)addr;
770 if (td && jailed(td->td_ucred))
771 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr);
772 if (inp->inp_faddr.s_addr != INADDR_ANY) {
773 error = EISCONN;
774 goto release;
775 }
776 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, &lport,
777 &faddr.s_addr, &fport, NULL, td);
778 if (error)
779 goto release;
780
781 /* Commit the local port if newly assigned. */
782 if (inp->inp_laddr.s_addr == INADDR_ANY &&
783 inp->inp_lport == 0) {
784 inp->inp_lport = lport;
785 if (in_pcbinshash(inp) != 0) {
786 inp->inp_lport = 0;
787 error = EAGAIN;
788 goto release;
789 }
790 inp->inp_flags |= INP_ANONPORT;
791 }
792 } else {
793 faddr = inp->inp_faddr;
794 fport = inp->inp_fport;
795 if (faddr.s_addr == INADDR_ANY) {
796 error = ENOTCONN;
797 goto release;
798 }
799 }
800 /*
801 * Calculate data length and get a mbuf
802 * for UDP and IP headers.
803 */
804 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
805 if (m == 0) {
806 error = ENOBUFS;
807 goto release;
808 }
809
810 /*
811 * Fill in mbuf with extended UDP header
812 * and addresses and length put into network format.
813 */
814 ui = mtod(m, struct udpiphdr *);
815 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */
816 ui->ui_pr = IPPROTO_UDP;
817 ui->ui_src = laddr;
818 ui->ui_dst = faddr;
819 ui->ui_sport = lport;
820 ui->ui_dport = fport;
821 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
822
823 /*
824 * Set up checksum and output datagram.
825 */
826 if (udpcksum) {
827 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr,
828 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
829 m->m_pkthdr.csum_flags = CSUM_UDP;
830 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
831 } else {
832 ui->ui_sum = 0;
833 }
834 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
835 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */
836 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */
837 udpstat.udps_opackets++;
838
839 error = ip_output(m, inp->inp_options, &inp->inp_route,
840 (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)),
841 inp->inp_moptions, inp);
842 return (error);
843
844 release:
845 m_freem(m);
846 return (error);
847 }
848
849 u_long udp_sendspace = 9216; /* really max datagram size */
850 /* 40 1K datagrams */
851 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
852 &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
853
854 u_long udp_recvspace = 40 * (1024 +
855 #ifdef INET6
856 sizeof(struct sockaddr_in6)
857 #else
858 sizeof(struct sockaddr_in)
859 #endif
860 );
861 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
862 &udp_recvspace, 0, "Maximum incoming UDP datagram size");
863
864 static int
865 udp_abort(struct socket *so)
866 {
867 struct inpcb *inp;
868 int s;
869
870 INP_INFO_WLOCK(&udbinfo);
871 inp = sotoinpcb(so);
872 if (inp == 0) {
873 INP_INFO_WUNLOCK(&udbinfo);
874 return EINVAL; /* ??? possible? panic instead? */
875 }
876 INP_LOCK(inp);
877 soisdisconnected(so);
878 s = splnet();
879 in_pcbdetach(inp);
880 INP_INFO_WUNLOCK(&udbinfo);
881 splx(s);
882 return 0;
883 }
884
885 static int
886 udp_attach(struct socket *so, int proto, struct thread *td)
887 {
888 struct inpcb *inp;
889 int s, error;
890
891 INP_INFO_WLOCK(&udbinfo);
892 inp = sotoinpcb(so);
893 if (inp != 0) {
894 INP_INFO_WUNLOCK(&udbinfo);
895 return EINVAL;
896 }
897 error = soreserve(so, udp_sendspace, udp_recvspace);
898 if (error) {
899 INP_INFO_WUNLOCK(&udbinfo);
900 return error;
901 }
902 s = splnet();
903 error = in_pcballoc(so, &udbinfo, td);
904 splx(s);
905 if (error)
906 return error;
907
908 inp = (struct inpcb *)so->so_pcb;
909 INP_LOCK(inp);
910 INP_INFO_WUNLOCK(&udbinfo);
911 inp->inp_vflag |= INP_IPV4;
912 inp->inp_ip_ttl = ip_defttl;
913 INP_UNLOCK(inp);
914 return 0;
915 }
916
917 static int
918 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
919 {
920 struct inpcb *inp;
921 int s, error;
922
923 INP_INFO_WLOCK(&udbinfo);
924 inp = sotoinpcb(so);
925 if (inp == 0) {
926 INP_INFO_WUNLOCK(&udbinfo);
927 return EINVAL;
928 }
929 INP_LOCK(inp);
930 s = splnet();
931 error = in_pcbbind(inp, nam, td);
932 splx(s);
933 INP_UNLOCK(inp);
934 INP_INFO_WUNLOCK(&udbinfo);
935 return error;
936 }
937
938 static int
939 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
940 {
941 struct inpcb *inp;
942 int s, error;
943 struct sockaddr_in *sin;
944
945 INP_INFO_WLOCK(&udbinfo);
946 inp = sotoinpcb(so);
947 if (inp == 0) {
948 INP_INFO_WUNLOCK(&udbinfo);
949 return EINVAL;
950 }
951 INP_LOCK(inp);
952 if (inp->inp_faddr.s_addr != INADDR_ANY) {
953 INP_UNLOCK(inp);
954 INP_INFO_WUNLOCK(&udbinfo);
955 return EISCONN;
956 }
957 s = splnet();
958 sin = (struct sockaddr_in *)nam;
959 if (td && jailed(td->td_ucred))
960 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr);
961 error = in_pcbconnect(inp, nam, td);
962 splx(s);
963 if (error == 0)
964 soisconnected(so);
965 INP_UNLOCK(inp);
966 INP_INFO_WUNLOCK(&udbinfo);
967 return error;
968 }
969
970 static int
971 udp_detach(struct socket *so)
972 {
973 struct inpcb *inp;
974 int s;
975
976 INP_INFO_WLOCK(&udbinfo);
977 inp = sotoinpcb(so);
978 if (inp == 0) {
979 INP_INFO_WUNLOCK(&udbinfo);
980 return EINVAL;
981 }
982 INP_LOCK(inp);
983 s = splnet();
984 in_pcbdetach(inp);
985 INP_INFO_WUNLOCK(&udbinfo);
986 splx(s);
987 return 0;
988 }
989
990 static int
991 udp_disconnect(struct socket *so)
992 {
993 struct inpcb *inp;
994 int s;
995
996 INP_INFO_WLOCK(&udbinfo);
997 inp = sotoinpcb(so);
998 if (inp == 0) {
999 INP_INFO_WUNLOCK(&udbinfo);
1000 return EINVAL;
1001 }
1002 INP_LOCK(inp);
1003 if (inp->inp_faddr.s_addr == INADDR_ANY) {
1004 INP_INFO_WUNLOCK(&udbinfo);
1005 INP_UNLOCK(inp);
1006 return ENOTCONN;
1007 }
1008
1009 s = splnet();
1010 in_pcbdisconnect(inp);
1011 inp->inp_laddr.s_addr = INADDR_ANY;
1012 INP_UNLOCK(inp);
1013 INP_INFO_WUNLOCK(&udbinfo);
1014 splx(s);
1015 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1016 return 0;
1017 }
1018
1019 static int
1020 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1021 struct mbuf *control, struct thread *td)
1022 {
1023 struct inpcb *inp;
1024 int ret;
1025
1026 INP_INFO_WLOCK(&udbinfo);
1027 inp = sotoinpcb(so);
1028 if (inp == 0) {
1029 INP_INFO_WUNLOCK(&udbinfo);
1030 m_freem(m);
1031 return EINVAL;
1032 }
1033 INP_LOCK(inp);
1034 ret = udp_output(inp, m, addr, control, td);
1035 INP_UNLOCK(inp);
1036 INP_INFO_WUNLOCK(&udbinfo);
1037 return ret;
1038 }
1039
1040 int
1041 udp_shutdown(struct socket *so)
1042 {
1043 struct inpcb *inp;
1044
1045 INP_INFO_RLOCK(&udbinfo);
1046 inp = sotoinpcb(so);
1047 if (inp == 0) {
1048 INP_INFO_RUNLOCK(&udbinfo);
1049 return EINVAL;
1050 }
1051 INP_LOCK(inp);
1052 INP_INFO_RUNLOCK(&udbinfo);
1053 socantsendmore(so);
1054 INP_UNLOCK(inp);
1055 return 0;
1056 }
1057
1058 /*
1059 * This is the wrapper function for in_setsockaddr. We just pass down
1060 * the pcbinfo for in_setsockaddr to lock. We don't want to do the locking
1061 * here because in_setsockaddr will call malloc and might block.
1062 */
1063 static int
1064 udp_sockaddr(struct socket *so, struct sockaddr **nam)
1065 {
1066 return (in_setsockaddr(so, nam, &udbinfo));
1067 }
1068
1069 /*
1070 * This is the wrapper function for in_setpeeraddr. We just pass down
1071 * the pcbinfo for in_setpeeraddr to lock.
1072 */
1073 static int
1074 udp_peeraddr(struct socket *so, struct sockaddr **nam)
1075 {
1076 return (in_setpeeraddr(so, nam, &udbinfo));
1077 }
1078
1079 struct pr_usrreqs udp_usrreqs = {
1080 udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect,
1081 pru_connect2_notsupp, in_control, udp_detach, udp_disconnect,
1082 pru_listen_notsupp, udp_peeraddr, pru_rcvd_notsupp,
1083 pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown,
1084 udp_sockaddr, sosend, soreceive, sopoll
1085 };
Cache object: 24ea3fc1cfd4ffd20dbcc0b994d137ac
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