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1 /*
2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
7 *
8 * This file contains Original Code and/or Modifications of Original Code
9 * as defined in and that are subject to the Apple Public Source License
10 * Version 2.0 (the 'License'). You may not use this file except in
11 * compliance with the License. Please obtain a copy of the License at
12 * http://www.opensource.apple.com/apsl/ and read it before using this
13 * file.
14 *
15 * The Original Code and all software distributed under the License are
16 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
17 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
18 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
20 * Please see the License for the specific language governing rights and
21 * limitations under the License.
22 *
23 * @APPLE_LICENSE_HEADER_END@
24 */
25 /*
26 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
27 * The Regents of the University of California. All rights reserved.
28 *
29 * Redistribution and use in source and binary forms, with or without
30 * modification, are permitted provided that the following conditions
31 * are met:
32 * 1. Redistributions of source code must retain the above copyright
33 * notice, this list of conditions and the following disclaimer.
34 * 2. Redistributions in binary form must reproduce the above copyright
35 * notice, this list of conditions and the following disclaimer in the
36 * documentation and/or other materials provided with the distribution.
37 * 3. All advertising materials mentioning features or use of this software
38 * must display the following acknowledgement:
39 * This product includes software developed by the University of
40 * California, Berkeley and its contributors.
41 * 4. Neither the name of the University nor the names of its contributors
42 * may be used to endorse or promote products derived from this software
43 * without specific prior written permission.
44 *
45 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
48 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
55 * SUCH DAMAGE.
56 *
57 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
58 * $FreeBSD: src/sys/netinet/udp_usrreq.c,v 1.64.2.13 2001/08/08 18:59:54 ghelmer Exp $
59 */
60
61 #include <sys/param.h>
62 #include <sys/systm.h>
63 #include <sys/kernel.h>
64 #include <sys/malloc.h>
65 #include <sys/mbuf.h>
66 #include <sys/domain.h>
67 #include <sys/protosw.h>
68 #include <sys/socket.h>
69 #include <sys/socketvar.h>
70 #include <sys/sysctl.h>
71 #include <sys/syslog.h>
72
73 #include <net/if.h>
74 #include <net/route.h>
75
76 #include <netinet/in.h>
77 #include <netinet/in_systm.h>
78 #include <netinet/ip.h>
79 #if INET6
80 #include <netinet/ip6.h>
81 #endif
82 #include <netinet/in_pcb.h>
83 #include <netinet/in_var.h>
84 #include <netinet/ip_var.h>
85 #if INET6
86 #include <netinet6/ip6_var.h>
87 #endif
88 #include <netinet/ip_icmp.h>
89 #include <netinet/icmp_var.h>
90 #include <netinet/udp.h>
91 #include <netinet/udp_var.h>
92 #include <sys/kdebug.h>
93
94 #if IPSEC
95 #include <netinet6/ipsec.h>
96 extern int ipsec_bypass;
97 #endif /*IPSEC*/
98
99
100 #define DBG_LAYER_IN_BEG NETDBG_CODE(DBG_NETUDP, 0)
101 #define DBG_LAYER_IN_END NETDBG_CODE(DBG_NETUDP, 2)
102 #define DBG_LAYER_OUT_BEG NETDBG_CODE(DBG_NETUDP, 1)
103 #define DBG_LAYER_OUT_END NETDBG_CODE(DBG_NETUDP, 3)
104 #define DBG_FNC_UDP_INPUT NETDBG_CODE(DBG_NETUDP, (5 << 8))
105 #define DBG_FNC_UDP_OUTPUT NETDBG_CODE(DBG_NETUDP, (6 << 8) | 1)
106
107
108 #define __STDC__ 1
109 /*
110 * UDP protocol implementation.
111 * Per RFC 768, August, 1980.
112 */
113 #ifndef COMPAT_42
114 static int udpcksum = 1;
115 #else
116 static int udpcksum = 0; /* XXX */
117 #endif
118 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
119 &udpcksum, 0, "");
120
121 int log_in_vain = 0;
122 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
123 &log_in_vain, 0, "Log all incoming UDP packets");
124
125 static int blackhole = 0;
126 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW,
127 &blackhole, 0, "Do not send port unreachables for refused connects");
128
129 struct inpcbhead udb; /* from udp_var.h */
130 #define udb6 udb /* for KAME src sync over BSD*'s */
131 struct inpcbinfo udbinfo;
132
133 #ifndef UDBHASHSIZE
134 #define UDBHASHSIZE 16
135 #endif
136
137 extern int apple_hwcksum_rx;
138
139 struct udpstat udpstat; /* from udp_var.h */
140 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RD,
141 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
142
143 static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
144 #if INET6
145 struct udp_in6 {
146 struct sockaddr_in6 uin6_sin;
147 u_char uin6_init_done : 1;
148 } udp_in6 = {
149 { sizeof(udp_in6.uin6_sin), AF_INET6 },
150 0
151 };
152 struct udp_ip6 {
153 struct ip6_hdr uip6_ip6;
154 u_char uip6_init_done : 1;
155 } udp_ip6;
156 #endif /* INET6 */
157
158 static void udp_append __P((struct inpcb *last, struct ip *ip,
159 struct mbuf *n, int off));
160 #if INET6
161 static void ip_2_ip6_hdr __P((struct ip6_hdr *ip6, struct ip *ip));
162 #endif
163
164 static int udp_detach __P((struct socket *so));
165 static int udp_output __P((struct inpcb *, struct mbuf *, struct sockaddr *,
166 struct mbuf *, struct proc *));
167
168 void
169 udp_init()
170 {
171 vm_size_t str_size;
172 int stat;
173 u_char fake_owner;
174 struct in_addr laddr;
175 struct in_addr faddr;
176 u_short lport;
177
178 LIST_INIT(&udb);
179 udbinfo.listhead = &udb;
180 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask);
181 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB,
182 &udbinfo.porthashmask);
183 #ifdef __APPLE__
184 str_size = (vm_size_t) sizeof(struct inpcb);
185 udbinfo.ipi_zone = (void *) zinit(str_size, 80000*str_size, 8192, "udpcb");
186
187 udbinfo.last_pcb = 0;
188 in_pcb_nat_init(&udbinfo, AF_INET, IPPROTO_UDP, SOCK_DGRAM);
189 #else
190 udbinfo.ipi_zone = zinit("udpcb", sizeof(struct inpcb), maxsockets,
191 ZONE_INTERRUPT, 0);
192 #endif
193
194 #if 0
195 /* for pcb sharing testing only */
196 stat = in_pcb_new_share_client(&udbinfo, &fake_owner);
197 kprintf("udp_init in_pcb_new_share_client - stat = %d\n", stat);
198
199 laddr.s_addr = 0x11646464;
200 faddr.s_addr = 0x11646465;
201
202 lport = 1500;
203 in_pcb_grab_port(&udbinfo, 0, laddr, &lport, faddr, 1600, 0, fake_owner);
204 kprintf("udp_init in_pcb_grab_port - stat = %d\n", stat);
205
206 stat = in_pcb_rem_share_client(&udbinfo, fake_owner);
207 kprintf("udp_init in_pcb_rem_share_client - stat = %d\n", stat);
208
209 stat = in_pcb_new_share_client(&udbinfo, &fake_owner);
210 kprintf("udp_init in_pcb_new_share_client(2) - stat = %d\n", stat);
211
212 laddr.s_addr = 0x11646464;
213 faddr.s_addr = 0x11646465;
214
215 lport = 1500;
216 stat = in_pcb_grab_port(&udbinfo, 0, laddr, &lport, faddr, 1600, 0, fake_owner);
217 kprintf("udp_init in_pcb_grab_port(2) - stat = %d\n", stat);
218 #endif
219 }
220
221 void
222 udp_input(m, iphlen)
223 register struct mbuf *m;
224 int iphlen;
225 {
226 register struct ip *ip;
227 register struct udphdr *uh;
228 register struct inpcb *inp;
229 struct mbuf *opts = 0;
230 int len;
231 struct ip save_ip;
232 struct sockaddr *append_sa;
233
234 udpstat.udps_ipackets++;
235
236 KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_START, 0,0,0,0,0);
237 if (m->m_pkthdr.csum_flags & CSUM_TCP_SUM16)
238 m->m_pkthdr.csum_flags = 0; /* invalidate hwcksum for UDP */
239
240 /*
241 * Strip IP options, if any; should skip this,
242 * make available to user, and use on returned packets,
243 * but we don't yet have a way to check the checksum
244 * with options still present.
245 */
246 if (iphlen > sizeof (struct ip)) {
247 ip_stripoptions(m, (struct mbuf *)0);
248 iphlen = sizeof(struct ip);
249 }
250
251 /*
252 * Get IP and UDP header together in first mbuf.
253 */
254 ip = mtod(m, struct ip *);
255 if (m->m_len < iphlen + sizeof(struct udphdr)) {
256 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
257 udpstat.udps_hdrops++;
258 KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0);
259 return;
260 }
261 ip = mtod(m, struct ip *);
262 }
263 uh = (struct udphdr *)((caddr_t)ip + iphlen);
264
265 /* destination port of 0 is illegal, based on RFC768. */
266 if (uh->uh_dport == 0)
267 goto bad;
268
269 KERNEL_DEBUG(DBG_LAYER_IN_BEG, uh->uh_dport, uh->uh_sport,
270 ip->ip_src.s_addr, ip->ip_dst.s_addr, uh->uh_ulen);
271
272 /*
273 * Make mbuf data length reflect UDP length.
274 * If not enough data to reflect UDP length, drop.
275 */
276 len = ntohs((u_short)uh->uh_ulen);
277 if (ip->ip_len != len) {
278 if (len > ip->ip_len || len < sizeof(struct udphdr)) {
279 udpstat.udps_badlen++;
280 goto bad;
281 }
282 m_adj(m, len - ip->ip_len);
283 /* ip->ip_len = len; */
284 }
285 /*
286 * Save a copy of the IP header in case we want restore it
287 * for sending an ICMP error message in response.
288 */
289 save_ip = *ip;
290
291 /*
292 * Checksum extended UDP header and data.
293 */
294 if (uh->uh_sum) {
295 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
296 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
297 uh->uh_sum = m->m_pkthdr.csum_data;
298 else
299 goto doudpcksum;
300 uh->uh_sum ^= 0xffff;
301 } else {
302 char b[9];
303 doudpcksum:
304 *(uint32_t*)&b[0] = *(uint32_t*)&((struct ipovly *)ip)->ih_x1[0];
305 *(uint32_t*)&b[4] = *(uint32_t*)&((struct ipovly *)ip)->ih_x1[4];
306 *(uint8_t*)&b[8] = *(uint8_t*)&((struct ipovly *)ip)->ih_x1[8];
307
308 bzero(((struct ipovly *)ip)->ih_x1, 9);
309 ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
310 uh->uh_sum = in_cksum(m, len + sizeof (struct ip));
311
312 *(uint32_t*)&((struct ipovly *)ip)->ih_x1[0] = *(uint32_t*)&b[0];
313 *(uint32_t*)&((struct ipovly *)ip)->ih_x1[4] = *(uint32_t*)&b[4];
314 *(uint8_t*)&((struct ipovly *)ip)->ih_x1[8] = *(uint8_t*)&b[8];
315 }
316 if (uh->uh_sum) {
317 udpstat.udps_badsum++;
318 m_freem(m);
319 KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0);
320 return;
321 }
322 }
323 #ifndef __APPLE__
324 else
325 udpstat.udps_nosum++;
326 #endif
327
328 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
329 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
330 struct inpcb *last;
331 /*
332 * Deliver a multicast or broadcast datagram to *all* sockets
333 * for which the local and remote addresses and ports match
334 * those of the incoming datagram. This allows more than
335 * one process to receive multi/broadcasts on the same port.
336 * (This really ought to be done for unicast datagrams as
337 * well, but that would cause problems with existing
338 * applications that open both address-specific sockets and
339 * a wildcard socket listening to the same port -- they would
340 * end up receiving duplicates of every unicast datagram.
341 * Those applications open the multiple sockets to overcome an
342 * inadequacy of the UDP socket interface, but for backwards
343 * compatibility we avoid the problem here rather than
344 * fixing the interface. Maybe 4.5BSD will remedy this?)
345 */
346
347 /*
348 * Construct sockaddr format source address.
349 */
350 udp_in.sin_port = uh->uh_sport;
351 udp_in.sin_addr = ip->ip_src;
352 /*
353 * Locate pcb(s) for datagram.
354 * (Algorithm copied from raw_intr().)
355 */
356 last = NULL;
357 #if INET6
358 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0;
359 #endif
360 LIST_FOREACH(inp, &udb, inp_list) {
361 #ifdef __APPLE__
362 /* Ignore nat/SharedIP dummy pcbs */
363 if (inp->inp_socket == &udbinfo.nat_dummy_socket)
364 continue;
365 #endif
366 #if INET6
367 if ((inp->inp_vflag & INP_IPV4) == 0)
368 continue;
369 #endif
370 if (inp->inp_lport != uh->uh_dport)
371 continue;
372 if (inp->inp_laddr.s_addr != INADDR_ANY) {
373 if (inp->inp_laddr.s_addr !=
374 ip->ip_dst.s_addr)
375 continue;
376 }
377 if (inp->inp_faddr.s_addr != INADDR_ANY) {
378 if (inp->inp_faddr.s_addr !=
379 ip->ip_src.s_addr ||
380 inp->inp_fport != uh->uh_sport)
381 continue;
382 }
383
384 if (last != NULL) {
385 struct mbuf *n;
386
387 #if IPSEC
388 /* check AH/ESP integrity. */
389 if (ipsec_bypass == 0 && ipsec4_in_reject_so(m, last->inp_socket)) {
390 ipsecstat.in_polvio++;
391 /* do not inject data to pcb */
392 } else
393 #endif /*IPSEC*/
394 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
395 udp_append(last, ip, n,
396 iphlen +
397 sizeof(struct udphdr));
398 }
399 }
400 last = inp;
401 /*
402 * Don't look for additional matches if this one does
403 * not have either the SO_REUSEPORT or SO_REUSEADDR
404 * socket options set. This heuristic avoids searching
405 * through all pcbs in the common case of a non-shared
406 * port. It * assumes that an application will never
407 * clear these options after setting them.
408 */
409 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0)
410 break;
411 }
412
413 if (last == NULL) {
414 /*
415 * No matching pcb found; discard datagram.
416 * (No need to send an ICMP Port Unreachable
417 * for a broadcast or multicast datgram.)
418 */
419 udpstat.udps_noportbcast++;
420 goto bad;
421 }
422 #if IPSEC
423 /* check AH/ESP integrity. */
424 if (ipsec_bypass == 0 && m && ipsec4_in_reject_so(m, last->inp_socket)) {
425 ipsecstat.in_polvio++;
426 goto bad;
427 }
428 #endif /*IPSEC*/
429 udp_append(last, ip, m, iphlen + sizeof(struct udphdr));
430 return;
431 }
432 /*
433 * Locate pcb for datagram.
434 */
435 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport,
436 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
437 if (inp == NULL) {
438 if (log_in_vain) {
439 char buf[4*sizeof "123"];
440
441 strcpy(buf, inet_ntoa(ip->ip_dst));
442 log(LOG_INFO,
443 "Connection attempt to UDP %s:%d from %s:%d\n",
444 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
445 ntohs(uh->uh_sport));
446 }
447 udpstat.udps_noport++;
448 if (m->m_flags & (M_BCAST | M_MCAST)) {
449 udpstat.udps_noportbcast++;
450 goto bad;
451 }
452 #if ICMP_BANDLIM
453 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
454 goto bad;
455 #endif
456 if (blackhole)
457 goto bad;
458 *ip = save_ip;
459 ip->ip_len += iphlen;
460 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
461 KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0);
462 return;
463 }
464 #if IPSEC
465 if (ipsec_bypass == 0 && inp != NULL && ipsec4_in_reject_so(m, inp->inp_socket)) {
466 ipsecstat.in_polvio++;
467 goto bad;
468 }
469 #endif /*IPSEC*/
470
471 /*
472 * Construct sockaddr format source address.
473 * Stuff source address and datagram in user buffer.
474 */
475 udp_in.sin_port = uh->uh_sport;
476 udp_in.sin_addr = ip->ip_src;
477 if (inp->inp_flags & INP_CONTROLOPTS
478 || inp->inp_socket->so_options & SO_TIMESTAMP) {
479 #if INET6
480 if (inp->inp_vflag & INP_IPV6) {
481 int savedflags;
482
483 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip);
484 savedflags = inp->inp_flags;
485 inp->inp_flags &= ~INP_UNMAPPABLEOPTS;
486 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m);
487 inp->inp_flags = savedflags;
488 } else
489 #endif
490 ip_savecontrol(inp, &opts, ip, m);
491 }
492 m_adj(m, iphlen + sizeof(struct udphdr));
493
494 KERNEL_DEBUG(DBG_LAYER_IN_END, uh->uh_dport, uh->uh_sport,
495 save_ip.ip_src.s_addr, save_ip.ip_dst.s_addr, uh->uh_ulen);
496
497 #if INET6
498 if (inp->inp_vflag & INP_IPV6) {
499 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin);
500 append_sa = (struct sockaddr *)&udp_in6;
501 } else
502 #endif
503 append_sa = (struct sockaddr *)&udp_in;
504 if (sbappendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) {
505 udpstat.udps_fullsock++;
506 goto bad;
507 }
508 sorwakeup(inp->inp_socket);
509 KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0);
510 return;
511 bad:
512 m_freem(m);
513 if (opts)
514 m_freem(opts);
515 KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0);
516 return;
517 }
518
519 #if INET6
520 static void
521 ip_2_ip6_hdr(ip6, ip)
522 struct ip6_hdr *ip6;
523 struct ip *ip;
524 {
525 bzero(ip6, sizeof(*ip6));
526
527 ip6->ip6_vfc = IPV6_VERSION;
528 ip6->ip6_plen = ip->ip_len;
529 ip6->ip6_nxt = ip->ip_p;
530 ip6->ip6_hlim = ip->ip_ttl;
531 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] =
532 IPV6_ADDR_INT32_SMP;
533 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr;
534 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr;
535 }
536 #endif
537
538 /*
539 * subroutine of udp_input(), mainly for source code readability.
540 * caller must properly init udp_ip6 and udp_in6 beforehand.
541 */
542 static void
543 udp_append(last, ip, n, off)
544 struct inpcb *last;
545 struct ip *ip;
546 struct mbuf *n;
547 int off;
548 {
549 struct sockaddr *append_sa;
550 struct mbuf *opts = 0;
551
552 if (last->inp_flags & INP_CONTROLOPTS ||
553 last->inp_socket->so_options & SO_TIMESTAMP) {
554 #if INET6
555 if (last->inp_vflag & INP_IPV6) {
556 int savedflags;
557
558 if (udp_ip6.uip6_init_done == 0) {
559 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip);
560 udp_ip6.uip6_init_done = 1;
561 }
562 savedflags = last->inp_flags;
563 last->inp_flags &= ~INP_UNMAPPABLEOPTS;
564 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n);
565 last->inp_flags = savedflags;
566 } else
567 #endif
568 ip_savecontrol(last, &opts, ip, n);
569 }
570 #if INET6
571 if (last->inp_vflag & INP_IPV6) {
572 if (udp_in6.uin6_init_done == 0) {
573 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin);
574 udp_in6.uin6_init_done = 1;
575 }
576 append_sa = (struct sockaddr *)&udp_in6.uin6_sin;
577 } else
578 #endif
579 append_sa = (struct sockaddr *)&udp_in;
580 m_adj(n, off);
581 if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) {
582 m_freem(n);
583 if (opts)
584 m_freem(opts);
585 udpstat.udps_fullsock++;
586 } else
587 sorwakeup(last->inp_socket);
588 }
589
590 /*
591 * Notify a udp user of an asynchronous error;
592 * just wake up so that he can collect error status.
593 */
594 void
595 udp_notify(inp, errno)
596 register struct inpcb *inp;
597 int errno;
598 {
599 inp->inp_socket->so_error = errno;
600 sorwakeup(inp->inp_socket);
601 sowwakeup(inp->inp_socket);
602 }
603
604 void
605 udp_ctlinput(cmd, sa, vip)
606 int cmd;
607 struct sockaddr *sa;
608 void *vip;
609 {
610 struct ip *ip = vip;
611 struct udphdr *uh;
612 void (*notify) __P((struct inpcb *, int)) = udp_notify;
613 struct in_addr faddr;
614 struct inpcb *inp;
615 int s;
616
617 faddr = ((struct sockaddr_in *)sa)->sin_addr;
618 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
619 return;
620
621 if (PRC_IS_REDIRECT(cmd)) {
622 ip = 0;
623 notify = in_rtchange;
624 } else if (cmd == PRC_HOSTDEAD)
625 ip = 0;
626 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
627 return;
628 if (ip) {
629 s = splnet();
630 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
631 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport,
632 ip->ip_src, uh->uh_sport, 0, NULL);
633 if (inp != NULL && inp->inp_socket != NULL)
634 (*notify)(inp, inetctlerrmap[cmd]);
635 splx(s);
636 } else
637 in_pcbnotifyall(&udb, faddr, inetctlerrmap[cmd], notify);
638 }
639
640 static int
641 udp_pcblist SYSCTL_HANDLER_ARGS
642 {
643 int error, i, n, s;
644 struct inpcb *inp, **inp_list;
645 inp_gen_t gencnt;
646 struct xinpgen xig;
647
648 /*
649 * The process of preparing the TCB list is too time-consuming and
650 * resource-intensive to repeat twice on every request.
651 */
652 if (req->oldptr == 0) {
653 n = udbinfo.ipi_count;
654 req->oldidx = 2 * (sizeof xig)
655 + (n + n/8) * sizeof(struct xinpcb);
656 return 0;
657 }
658
659 if (req->newptr != 0)
660 return EPERM;
661
662 /*
663 * OK, now we're committed to doing something.
664 */
665 s = splnet();
666 gencnt = udbinfo.ipi_gencnt;
667 n = udbinfo.ipi_count;
668 splx(s);
669
670 xig.xig_len = sizeof xig;
671 xig.xig_count = n;
672 xig.xig_gen = gencnt;
673 xig.xig_sogen = so_gencnt;
674 error = SYSCTL_OUT(req, &xig, sizeof xig);
675 if (error)
676 return error;
677 /*
678 * We are done if there is no pcb
679 */
680 if (n == 0)
681 return 0;
682
683 inp_list = _MALLOC(n * sizeof *inp_list, M_TEMP, M_WAITOK);
684 if (inp_list == 0) {
685 return ENOMEM;
686 }
687
688 for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n;
689 inp = LIST_NEXT(inp, inp_list)) {
690 if (inp->inp_gencnt <= gencnt)
691 inp_list[i++] = inp;
692 }
693 splx(s);
694 n = i;
695
696 error = 0;
697 for (i = 0; i < n; i++) {
698 inp = inp_list[i];
699 if (inp->inp_gencnt <= gencnt) {
700 struct xinpcb xi;
701 xi.xi_len = sizeof xi;
702 /* XXX should avoid extra copy */
703 bcopy(inp, &xi.xi_inp, sizeof *inp);
704 if (inp->inp_socket)
705 sotoxsocket(inp->inp_socket, &xi.xi_socket);
706 error = SYSCTL_OUT(req, &xi, sizeof xi);
707 }
708 }
709 if (!error) {
710 /*
711 * Give the user an updated idea of our state.
712 * If the generation differs from what we told
713 * her before, she knows that something happened
714 * while we were processing this request, and it
715 * might be necessary to retry.
716 */
717 s = splnet();
718 xig.xig_gen = udbinfo.ipi_gencnt;
719 xig.xig_sogen = so_gencnt;
720 xig.xig_count = udbinfo.ipi_count;
721 splx(s);
722 error = SYSCTL_OUT(req, &xig, sizeof xig);
723 }
724 FREE(inp_list, M_TEMP);
725 return error;
726 }
727
728 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0,
729 udp_pcblist, "S,xinpcb", "List of active UDP sockets");
730
731
732
733 static int
734 udp_output(inp, m, addr, control, p)
735 register struct inpcb *inp;
736 struct mbuf *m;
737 struct sockaddr *addr;
738 struct mbuf *control;
739 struct proc *p;
740 {
741 register struct udpiphdr *ui;
742 register int len = m->m_pkthdr.len;
743 struct in_addr laddr;
744 int s = 0, error = 0;
745
746 KERNEL_DEBUG(DBG_FNC_UDP_OUTPUT | DBG_FUNC_START, 0,0,0,0,0);
747
748 if (control)
749 m_freem(control); /* XXX */
750
751 KERNEL_DEBUG(DBG_LAYER_OUT_BEG, inp->inp_fport, inp->inp_lport,
752 inp->inp_laddr.s_addr, inp->inp_faddr.s_addr,
753 (htons((u_short)len + sizeof (struct udphdr))));
754
755 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
756 error = EMSGSIZE;
757 goto release;
758 }
759
760 if (addr) {
761 laddr = inp->inp_laddr;
762 if (inp->inp_faddr.s_addr != INADDR_ANY) {
763 error = EISCONN;
764 goto release;
765 }
766 /*
767 * Must block input while temporarily connected.
768 */
769 s = splnet();
770 error = in_pcbconnect(inp, addr, p);
771 if (error) {
772 splx(s);
773 goto release;
774 }
775 } else {
776 if (inp->inp_faddr.s_addr == INADDR_ANY) {
777 error = ENOTCONN;
778 goto release;
779 }
780 }
781 /*
782 * Calculate data length and get a mbuf
783 * for UDP and IP headers.
784 */
785 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
786 if (m == 0) {
787 error = ENOBUFS;
788 if (addr)
789 splx(s);
790 goto release;
791 }
792
793 /*
794 * Fill in mbuf with extended UDP header
795 * and addresses and length put into network format.
796 */
797 ui = mtod(m, struct udpiphdr *);
798 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */
799 ui->ui_pr = IPPROTO_UDP;
800 ui->ui_src = inp->inp_laddr;
801 ui->ui_dst = inp->inp_faddr;
802 ui->ui_sport = inp->inp_lport;
803 ui->ui_dport = inp->inp_fport;
804 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
805
806 /*
807 * Set up checksum and output datagram.
808 */
809 if (udpcksum) {
810 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr,
811 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
812 m->m_pkthdr.csum_flags = CSUM_UDP;
813 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
814 } else {
815 ui->ui_sum = 0;
816 }
817 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
818 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */
819 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */
820 udpstat.udps_opackets++;
821
822 KERNEL_DEBUG(DBG_LAYER_OUT_END, ui->ui_dport, ui->ui_sport,
823 ui->ui_src.s_addr, ui->ui_dst.s_addr, ui->ui_ulen);
824
825 #if IPSEC
826 if (ipsec_bypass == 0 && ipsec_setsocket(m, inp->inp_socket) != 0) {
827 error = ENOBUFS;
828 goto release;
829 }
830 #endif /*IPSEC*/
831 error = ip_output(m, inp->inp_options, &inp->inp_route,
832 (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)),
833 inp->inp_moptions);
834
835 if (addr) {
836 in_pcbdisconnect(inp);
837 inp->inp_laddr = laddr; /* XXX rehash? */
838 splx(s);
839 }
840 KERNEL_DEBUG(DBG_FNC_UDP_OUTPUT | DBG_FUNC_END, error, 0,0,0,0);
841 return (error);
842
843 release:
844 m_freem(m);
845 KERNEL_DEBUG(DBG_FNC_UDP_OUTPUT | DBG_FUNC_END, error, 0,0,0,0);
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 #if 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 = sotoinpcb(so);
871 if (inp == 0)
872 return EINVAL; /* ??? possible? panic instead? */
873 soisdisconnected(so);
874 s = splnet();
875 in_pcbdetach(inp);
876 splx(s);
877 return 0;
878 }
879
880 static int
881 udp_attach(struct socket *so, int proto, struct proc *p)
882 {
883 struct inpcb *inp;
884 int error; long s;
885
886 inp = sotoinpcb(so);
887 if (inp != 0)
888 return EINVAL;
889
890 error = soreserve(so, udp_sendspace, udp_recvspace);
891 if (error)
892 return error;
893 s = splnet();
894 error = in_pcballoc(so, &udbinfo, p);
895 splx(s);
896 if (error)
897 return error;
898 inp = (struct inpcb *)so->so_pcb;
899 inp->inp_vflag |= INP_IPV4;
900 inp->inp_ip_ttl = ip_defttl;
901 return 0;
902 }
903
904 static int
905 udp_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
906 {
907 struct inpcb *inp;
908 int s, error;
909
910 inp = sotoinpcb(so);
911 if (inp == 0)
912 return EINVAL;
913 s = splnet();
914 error = in_pcbbind(inp, nam, p);
915 splx(s);
916 return error;
917 }
918
919 static int
920 udp_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
921 {
922 struct inpcb *inp;
923 int s, error;
924
925 inp = sotoinpcb(so);
926 if (inp == 0)
927 return EINVAL;
928 if (inp->inp_faddr.s_addr != INADDR_ANY)
929 return EISCONN;
930 s = splnet();
931 error = in_pcbconnect(inp, nam, p);
932 splx(s);
933 if (error == 0)
934 soisconnected(so);
935 return error;
936 }
937
938 static int
939 udp_detach(struct socket *so)
940 {
941 struct inpcb *inp;
942 int s;
943
944 inp = sotoinpcb(so);
945 if (inp == 0)
946 return EINVAL;
947 s = splnet();
948 in_pcbdetach(inp);
949 splx(s);
950 return 0;
951 }
952
953 static int
954 udp_disconnect(struct socket *so)
955 {
956 struct inpcb *inp;
957 int s;
958
959 inp = sotoinpcb(so);
960 if (inp == 0)
961 return EINVAL;
962 if (inp->inp_faddr.s_addr == INADDR_ANY)
963 return ENOTCONN;
964
965 s = splnet();
966 in_pcbdisconnect(inp);
967 inp->inp_laddr.s_addr = INADDR_ANY;
968 splx(s);
969 so->so_state &= ~SS_ISCONNECTED; /* XXX */
970 return 0;
971 }
972
973 static int
974 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
975 struct mbuf *control, struct proc *p)
976 {
977 struct inpcb *inp;
978
979 inp = sotoinpcb(so);
980 if (inp == 0) {
981 m_freem(m);
982 return EINVAL;
983 }
984 return udp_output(inp, m, addr, control, p);
985 }
986
987 int
988 udp_shutdown(struct socket *so)
989 {
990 struct inpcb *inp;
991
992 inp = sotoinpcb(so);
993 if (inp == 0)
994 return EINVAL;
995 socantsendmore(so);
996 return 0;
997 }
998
999 struct pr_usrreqs udp_usrreqs = {
1000 udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect,
1001 pru_connect2_notsupp, in_control, udp_detach, udp_disconnect,
1002 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp,
1003 pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown,
1004 in_setsockaddr, sosend, soreceive, sopoll
1005 };
1006
mirror of XNU