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[apple/xnu.git] / bsd / netinet / udp_usrreq.c
1 /*
2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * The contents of this file constitute Original Code as defined in and
7 * are subject to the Apple Public Source License Version 1.1 (the
8 * "License"). You may not use this file except in compliance with the
9 * License. Please obtain a copy of the License at
10 * http://www.apple.com/publicsource and read it before using this file.
11 *
12 * This Original Code and all software distributed under the License are
13 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17 * License for the specific language governing rights and limitations
18 * under the License.
19 *
20 * @APPLE_LICENSE_HEADER_END@
21 */
22 /*
23 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
24 * The Regents of the University of California. All rights reserved.
25 *
26 * Redistribution and use in source and binary forms, with or without
27 * modification, are permitted provided that the following conditions
28 * are met:
29 * 1. Redistributions of source code must retain the above copyright
30 * notice, this list of conditions and the following disclaimer.
31 * 2. Redistributions in binary form must reproduce the above copyright
32 * notice, this list of conditions and the following disclaimer in the
33 * documentation and/or other materials provided with the distribution.
34 * 3. All advertising materials mentioning features or use of this software
35 * must display the following acknowledgement:
36 * This product includes software developed by the University of
37 * California, Berkeley and its contributors.
38 * 4. Neither the name of the University nor the names of its contributors
39 * may be used to endorse or promote products derived from this software
40 * without specific prior written permission.
41 *
42 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
43 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
44 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
45 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
46 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
47 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
48 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
49 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
50 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
51 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * SUCH DAMAGE.
53 *
54 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
55 * $FreeBSD: src/sys/netinet/udp_usrreq.c,v 1.64.2.13 2001/08/08 18:59:54 ghelmer Exp $
56 */
57
58 #include <sys/param.h>
59 #include <sys/systm.h>
60 #include <sys/kernel.h>
61 #include <sys/malloc.h>
62 #include <sys/mbuf.h>
63 #include <sys/domain.h>
64 #include <sys/protosw.h>
65 #include <sys/socket.h>
66 #include <sys/socketvar.h>
67 #include <sys/sysctl.h>
68 #include <sys/syslog.h>
69
70 #include <net/if.h>
71 #include <net/route.h>
72
73 #include <netinet/in.h>
74 #include <netinet/in_systm.h>
75 #include <netinet/ip.h>
76 #if INET6
77 #include <netinet/ip6.h>
78 #endif
79 #include <netinet/in_pcb.h>
80 #include <netinet/in_var.h>
81 #include <netinet/ip_var.h>
82 #if INET6
83 #include <netinet6/ip6_var.h>
84 #endif
85 #include <netinet/ip_icmp.h>
86 #include <netinet/icmp_var.h>
87 #include <netinet/udp.h>
88 #include <netinet/udp_var.h>
89 #include <sys/kdebug.h>
90
91 #if IPSEC
92 #include <netinet6/ipsec.h>
93 extern int ipsec_bypass;
94 #endif /*IPSEC*/
95
96
97 #define DBG_LAYER_IN_BEG NETDBG_CODE(DBG_NETUDP, 0)
98 #define DBG_LAYER_IN_END NETDBG_CODE(DBG_NETUDP, 2)
99 #define DBG_LAYER_OUT_BEG NETDBG_CODE(DBG_NETUDP, 1)
100 #define DBG_LAYER_OUT_END NETDBG_CODE(DBG_NETUDP, 3)
101 #define DBG_FNC_UDP_INPUT NETDBG_CODE(DBG_NETUDP, (5 << 8))
102 #define DBG_FNC_UDP_OUTPUT NETDBG_CODE(DBG_NETUDP, (6 << 8) | 1)
103
104
105 #define __STDC__ 1
106 /*
107 * UDP protocol implementation.
108 * Per RFC 768, August, 1980.
109 */
110 #ifndef COMPAT_42
111 static int udpcksum = 1;
112 #else
113 static int udpcksum = 0; /* XXX */
114 #endif
115 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
116 &udpcksum, 0, "");
117
118 int log_in_vain = 0;
119 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
120 &log_in_vain, 0, "Log all incoming UDP packets");
121
122 static int blackhole = 0;
123 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW,
124 &blackhole, 0, "Do not send port unreachables for refused connects");
125
126 struct inpcbhead udb; /* from udp_var.h */
127 #define udb6 udb /* for KAME src sync over BSD*'s */
128 struct inpcbinfo udbinfo;
129
130 #ifndef UDBHASHSIZE
131 #define UDBHASHSIZE 16
132 #endif
133
134 extern int apple_hwcksum_rx;
135
136 struct udpstat udpstat; /* from udp_var.h */
137 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RD,
138 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
139
140 static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
141 #if INET6
142 struct udp_in6 {
143 struct sockaddr_in6 uin6_sin;
144 u_char uin6_init_done : 1;
145 } udp_in6 = {
146 { sizeof(udp_in6.uin6_sin), AF_INET6 },
147 0
148 };
149 struct udp_ip6 {
150 struct ip6_hdr uip6_ip6;
151 u_char uip6_init_done : 1;
152 } udp_ip6;
153 #endif /* INET6 */
154
155 static void udp_append __P((struct inpcb *last, struct ip *ip,
156 struct mbuf *n, int off));
157 #if INET6
158 static void ip_2_ip6_hdr __P((struct ip6_hdr *ip6, struct ip *ip));
159 #endif
160
161 static int udp_detach __P((struct socket *so));
162 static int udp_output __P((struct inpcb *, struct mbuf *, struct sockaddr *,
163 struct mbuf *, struct proc *));
164
165 void
166 udp_init()
167 {
168 vm_size_t str_size;
169 int stat;
170 u_char fake_owner;
171 struct in_addr laddr;
172 struct in_addr faddr;
173 u_short lport;
174
175 LIST_INIT(&udb);
176 udbinfo.listhead = &udb;
177 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask);
178 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB,
179 &udbinfo.porthashmask);
180 #ifdef __APPLE__
181 str_size = (vm_size_t) sizeof(struct inpcb);
182 udbinfo.ipi_zone = (void *) zinit(str_size, 80000*str_size, 8192, "udpcb");
183
184 udbinfo.last_pcb = 0;
185 in_pcb_nat_init(&udbinfo, AF_INET, IPPROTO_UDP, SOCK_DGRAM);
186 #else
187 udbinfo.ipi_zone = zinit("udpcb", sizeof(struct inpcb), maxsockets,
188 ZONE_INTERRUPT, 0);
189 #endif
190
191 #if 0
192 /* for pcb sharing testing only */
193 stat = in_pcb_new_share_client(&udbinfo, &fake_owner);
194 kprintf("udp_init in_pcb_new_share_client - stat = %d\n", stat);
195
196 laddr.s_addr = 0x11646464;
197 faddr.s_addr = 0x11646465;
198
199 lport = 1500;
200 in_pcb_grab_port(&udbinfo, 0, laddr, &lport, faddr, 1600, 0, fake_owner);
201 kprintf("udp_init in_pcb_grab_port - stat = %d\n", stat);
202
203 stat = in_pcb_rem_share_client(&udbinfo, fake_owner);
204 kprintf("udp_init in_pcb_rem_share_client - stat = %d\n", stat);
205
206 stat = in_pcb_new_share_client(&udbinfo, &fake_owner);
207 kprintf("udp_init in_pcb_new_share_client(2) - stat = %d\n", stat);
208
209 laddr.s_addr = 0x11646464;
210 faddr.s_addr = 0x11646465;
211
212 lport = 1500;
213 stat = in_pcb_grab_port(&udbinfo, 0, laddr, &lport, faddr, 1600, 0, fake_owner);
214 kprintf("udp_init in_pcb_grab_port(2) - stat = %d\n", stat);
215 #endif
216 }
217
218 void
219 udp_input(m, iphlen)
220 register struct mbuf *m;
221 int iphlen;
222 {
223 register struct ip *ip;
224 register struct udphdr *uh;
225 register struct inpcb *inp;
226 struct mbuf *opts = 0;
227 int len;
228 struct ip save_ip;
229 struct sockaddr *append_sa;
230
231 udpstat.udps_ipackets++;
232
233 KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_START, 0,0,0,0,0);
234 if (m->m_pkthdr.csum_flags & CSUM_TCP_SUM16)
235 m->m_pkthdr.csum_flags = 0; /* invalidate hwcksum for UDP */
236
237 /*
238 * Strip IP options, if any; should skip this,
239 * make available to user, and use on returned packets,
240 * but we don't yet have a way to check the checksum
241 * with options still present.
242 */
243 if (iphlen > sizeof (struct ip)) {
244 ip_stripoptions(m, (struct mbuf *)0);
245 iphlen = sizeof(struct ip);
246 }
247
248 /*
249 * Get IP and UDP header together in first mbuf.
250 */
251 ip = mtod(m, struct ip *);
252 if (m->m_len < iphlen + sizeof(struct udphdr)) {
253 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
254 udpstat.udps_hdrops++;
255 KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0);
256 return;
257 }
258 ip = mtod(m, struct ip *);
259 }
260 uh = (struct udphdr *)((caddr_t)ip + iphlen);
261
262 /* destination port of 0 is illegal, based on RFC768. */
263 if (uh->uh_dport == 0)
264 goto bad;
265
266 KERNEL_DEBUG(DBG_LAYER_IN_BEG, uh->uh_dport, uh->uh_sport,
267 ip->ip_src.s_addr, ip->ip_dst.s_addr, uh->uh_ulen);
268
269 /*
270 * Make mbuf data length reflect UDP length.
271 * If not enough data to reflect UDP length, drop.
272 */
273 len = ntohs((u_short)uh->uh_ulen);
274 if (ip->ip_len != len) {
275 if (len > ip->ip_len || len < sizeof(struct udphdr)) {
276 udpstat.udps_badlen++;
277 goto bad;
278 }
279 m_adj(m, len - ip->ip_len);
280 /* ip->ip_len = len; */
281 }
282 /*
283 * Save a copy of the IP header in case we want restore it
284 * for sending an ICMP error message in response.
285 */
286 save_ip = *ip;
287
288 /*
289 * Checksum extended UDP header and data.
290 */
291 if (uh->uh_sum) {
292 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
293 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
294 uh->uh_sum = m->m_pkthdr.csum_data;
295 else
296 goto doudpcksum;
297 uh->uh_sum ^= 0xffff;
298 } else {
299 char b[9];
300 doudpcksum:
301 *(uint32_t*)&b[0] = *(uint32_t*)&((struct ipovly *)ip)->ih_x1[0];
302 *(uint32_t*)&b[4] = *(uint32_t*)&((struct ipovly *)ip)->ih_x1[4];
303 *(uint8_t*)&b[8] = *(uint8_t*)&((struct ipovly *)ip)->ih_x1[8];
304
305 bzero(((struct ipovly *)ip)->ih_x1, 9);
306 ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
307 uh->uh_sum = in_cksum(m, len + sizeof (struct ip));
308
309 *(uint32_t*)&((struct ipovly *)ip)->ih_x1[0] = *(uint32_t*)&b[0];
310 *(uint32_t*)&((struct ipovly *)ip)->ih_x1[4] = *(uint32_t*)&b[4];
311 *(uint8_t*)&((struct ipovly *)ip)->ih_x1[8] = *(uint8_t*)&b[8];
312 }
313 if (uh->uh_sum) {
314 udpstat.udps_badsum++;
315 m_freem(m);
316 KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0);
317 return;
318 }
319 }
320 #ifndef __APPLE__
321 else
322 udpstat.udps_nosum++;
323 #endif
324
325 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
326 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
327 struct inpcb *last;
328 /*
329 * Deliver a multicast or broadcast datagram to *all* sockets
330 * for which the local and remote addresses and ports match
331 * those of the incoming datagram. This allows more than
332 * one process to receive multi/broadcasts on the same port.
333 * (This really ought to be done for unicast datagrams as
334 * well, but that would cause problems with existing
335 * applications that open both address-specific sockets and
336 * a wildcard socket listening to the same port -- they would
337 * end up receiving duplicates of every unicast datagram.
338 * Those applications open the multiple sockets to overcome an
339 * inadequacy of the UDP socket interface, but for backwards
340 * compatibility we avoid the problem here rather than
341 * fixing the interface. Maybe 4.5BSD will remedy this?)
342 */
343
344 /*
345 * Construct sockaddr format source address.
346 */
347 udp_in.sin_port = uh->uh_sport;
348 udp_in.sin_addr = ip->ip_src;
349 /*
350 * Locate pcb(s) for datagram.
351 * (Algorithm copied from raw_intr().)
352 */
353 last = NULL;
354 #if INET6
355 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0;
356 #endif
357 LIST_FOREACH(inp, &udb, inp_list) {
358 #ifdef __APPLE__
359 /* Ignore nat/SharedIP dummy pcbs */
360 if (inp->inp_socket == &udbinfo.nat_dummy_socket)
361 continue;
362 #endif
363 #if INET6
364 if ((inp->inp_vflag & INP_IPV4) == 0)
365 continue;
366 #endif
367 if (inp->inp_lport != uh->uh_dport)
368 continue;
369 if (inp->inp_laddr.s_addr != INADDR_ANY) {
370 if (inp->inp_laddr.s_addr !=
371 ip->ip_dst.s_addr)
372 continue;
373 }
374 if (inp->inp_faddr.s_addr != INADDR_ANY) {
375 if (inp->inp_faddr.s_addr !=
376 ip->ip_src.s_addr ||
377 inp->inp_fport != uh->uh_sport)
378 continue;
379 }
380
381 if (last != NULL) {
382 struct mbuf *n;
383
384 #if IPSEC
385 /* check AH/ESP integrity. */
386 if (ipsec_bypass == 0 && ipsec4_in_reject_so(m, last->inp_socket)) {
387 ipsecstat.in_polvio++;
388 /* do not inject data to pcb */
389 } else
390 #endif /*IPSEC*/
391 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
392 udp_append(last, ip, n,
393 iphlen +
394 sizeof(struct udphdr));
395 }
396 }
397 last = inp;
398 /*
399 * Don't look for additional matches if this one does
400 * not have either the SO_REUSEPORT or SO_REUSEADDR
401 * socket options set. This heuristic avoids searching
402 * through all pcbs in the common case of a non-shared
403 * port. It * assumes that an application will never
404 * clear these options after setting them.
405 */
406 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0)
407 break;
408 }
409
410 if (last == NULL) {
411 /*
412 * No matching pcb found; discard datagram.
413 * (No need to send an ICMP Port Unreachable
414 * for a broadcast or multicast datgram.)
415 */
416 udpstat.udps_noportbcast++;
417 goto bad;
418 }
419 #if IPSEC
420 /* check AH/ESP integrity. */
421 if (ipsec_bypass == 0 && m && ipsec4_in_reject_so(m, last->inp_socket)) {
422 ipsecstat.in_polvio++;
423 goto bad;
424 }
425 #endif /*IPSEC*/
426 udp_append(last, ip, m, iphlen + sizeof(struct udphdr));
427 return;
428 }
429 /*
430 * Locate pcb for datagram.
431 */
432 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport,
433 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
434 if (inp == NULL) {
435 if (log_in_vain) {
436 char buf[4*sizeof "123"];
437
438 strcpy(buf, inet_ntoa(ip->ip_dst));
439 log(LOG_INFO,
440 "Connection attempt to UDP %s:%d from %s:%d\n",
441 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
442 ntohs(uh->uh_sport));
443 }
444 udpstat.udps_noport++;
445 if (m->m_flags & (M_BCAST | M_MCAST)) {
446 udpstat.udps_noportbcast++;
447 goto bad;
448 }
449 #if ICMP_BANDLIM
450 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
451 goto bad;
452 #endif
453 if (blackhole)
454 goto bad;
455 *ip = save_ip;
456 ip->ip_len += iphlen;
457 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
458 KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0);
459 return;
460 }
461 #if IPSEC
462 if (ipsec_bypass == 0 && inp != NULL && ipsec4_in_reject_so(m, inp->inp_socket)) {
463 ipsecstat.in_polvio++;
464 goto bad;
465 }
466 #endif /*IPSEC*/
467
468 /*
469 * Construct sockaddr format source address.
470 * Stuff source address and datagram in user buffer.
471 */
472 udp_in.sin_port = uh->uh_sport;
473 udp_in.sin_addr = ip->ip_src;
474 if (inp->inp_flags & INP_CONTROLOPTS
475 || inp->inp_socket->so_options & SO_TIMESTAMP) {
476 #if INET6
477 if (inp->inp_vflag & INP_IPV6) {
478 int savedflags;
479
480 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip);
481 savedflags = inp->inp_flags;
482 inp->inp_flags &= ~INP_UNMAPPABLEOPTS;
483 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m);
484 inp->inp_flags = savedflags;
485 } else
486 #endif
487 ip_savecontrol(inp, &opts, ip, m);
488 }
489 m_adj(m, iphlen + sizeof(struct udphdr));
490
491 KERNEL_DEBUG(DBG_LAYER_IN_END, uh->uh_dport, uh->uh_sport,
492 save_ip.ip_src.s_addr, save_ip.ip_dst.s_addr, uh->uh_ulen);
493
494 #if INET6
495 if (inp->inp_vflag & INP_IPV6) {
496 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin);
497 append_sa = (struct sockaddr *)&udp_in6;
498 } else
499 #endif
500 append_sa = (struct sockaddr *)&udp_in;
501 if (sbappendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) {
502 udpstat.udps_fullsock++;
503 goto bad;
504 }
505 sorwakeup(inp->inp_socket);
506 KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0);
507 return;
508 bad:
509 m_freem(m);
510 if (opts)
511 m_freem(opts);
512 KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0);
513 return;
514 }
515
516 #if INET6
517 static void
518 ip_2_ip6_hdr(ip6, ip)
519 struct ip6_hdr *ip6;
520 struct ip *ip;
521 {
522 bzero(ip6, sizeof(*ip6));
523
524 ip6->ip6_vfc = IPV6_VERSION;
525 ip6->ip6_plen = ip->ip_len;
526 ip6->ip6_nxt = ip->ip_p;
527 ip6->ip6_hlim = ip->ip_ttl;
528 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] =
529 IPV6_ADDR_INT32_SMP;
530 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr;
531 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr;
532 }
533 #endif
534
535 /*
536 * subroutine of udp_input(), mainly for source code readability.
537 * caller must properly init udp_ip6 and udp_in6 beforehand.
538 */
539 static void
540 udp_append(last, ip, n, off)
541 struct inpcb *last;
542 struct ip *ip;
543 struct mbuf *n;
544 int off;
545 {
546 struct sockaddr *append_sa;
547 struct mbuf *opts = 0;
548
549 if (last->inp_flags & INP_CONTROLOPTS ||
550 last->inp_socket->so_options & SO_TIMESTAMP) {
551 #if INET6
552 if (last->inp_vflag & INP_IPV6) {
553 int savedflags;
554
555 if (udp_ip6.uip6_init_done == 0) {
556 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip);
557 udp_ip6.uip6_init_done = 1;
558 }
559 savedflags = last->inp_flags;
560 last->inp_flags &= ~INP_UNMAPPABLEOPTS;
561 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n);
562 last->inp_flags = savedflags;
563 } else
564 #endif
565 ip_savecontrol(last, &opts, ip, n);
566 }
567 #if INET6
568 if (last->inp_vflag & INP_IPV6) {
569 if (udp_in6.uin6_init_done == 0) {
570 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin);
571 udp_in6.uin6_init_done = 1;
572 }
573 append_sa = (struct sockaddr *)&udp_in6.uin6_sin;
574 } else
575 #endif
576 append_sa = (struct sockaddr *)&udp_in;
577 m_adj(n, off);
578 if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) {
579 m_freem(n);
580 if (opts)
581 m_freem(opts);
582 udpstat.udps_fullsock++;
583 } else
584 sorwakeup(last->inp_socket);
585 }
586
587 /*
588 * Notify a udp user of an asynchronous error;
589 * just wake up so that he can collect error status.
590 */
591 void
592 udp_notify(inp, errno)
593 register struct inpcb *inp;
594 int errno;
595 {
596 inp->inp_socket->so_error = errno;
597 sorwakeup(inp->inp_socket);
598 sowwakeup(inp->inp_socket);
599 }
600
601 void
602 udp_ctlinput(cmd, sa, vip)
603 int cmd;
604 struct sockaddr *sa;
605 void *vip;
606 {
607 struct ip *ip = vip;
608 struct udphdr *uh;
609 void (*notify) __P((struct inpcb *, int)) = udp_notify;
610 struct in_addr faddr;
611 struct inpcb *inp;
612 int s;
613
614 faddr = ((struct sockaddr_in *)sa)->sin_addr;
615 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
616 return;
617
618 if (PRC_IS_REDIRECT(cmd)) {
619 ip = 0;
620 notify = in_rtchange;
621 } else if (cmd == PRC_HOSTDEAD)
622 ip = 0;
623 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
624 return;
625 if (ip) {
626 s = splnet();
627 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
628 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport,
629 ip->ip_src, uh->uh_sport, 0, NULL);
630 if (inp != NULL && inp->inp_socket != NULL)
631 (*notify)(inp, inetctlerrmap[cmd]);
632 splx(s);
633 } else
634 in_pcbnotifyall(&udb, faddr, inetctlerrmap[cmd], notify);
635 }
636
637 static int
638 udp_pcblist SYSCTL_HANDLER_ARGS
639 {
640 int error, i, n, s;
641 struct inpcb *inp, **inp_list;
642 inp_gen_t gencnt;
643 struct xinpgen xig;
644
645 /*
646 * The process of preparing the TCB list is too time-consuming and
647 * resource-intensive to repeat twice on every request.
648 */
649 if (req->oldptr == 0) {
650 n = udbinfo.ipi_count;
651 req->oldidx = 2 * (sizeof xig)
652 + (n + n/8) * sizeof(struct xinpcb);
653 return 0;
654 }
655
656 if (req->newptr != 0)
657 return EPERM;
658
659 /*
660 * OK, now we're committed to doing something.
661 */
662 s = splnet();
663 gencnt = udbinfo.ipi_gencnt;
664 n = udbinfo.ipi_count;
665 splx(s);
666
667 xig.xig_len = sizeof xig;
668 xig.xig_count = n;
669 xig.xig_gen = gencnt;
670 xig.xig_sogen = so_gencnt;
671 error = SYSCTL_OUT(req, &xig, sizeof xig);
672 if (error)
673 return error;
674 /*
675 * We are done if there is no pcb
676 */
677 if (n == 0)
678 return 0;
679
680 inp_list = _MALLOC(n * sizeof *inp_list, M_TEMP, M_WAITOK);
681 if (inp_list == 0) {
682 return ENOMEM;
683 }
684
685 for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n;
686 inp = LIST_NEXT(inp, inp_list)) {
687 if (inp->inp_gencnt <= gencnt)
688 inp_list[i++] = inp;
689 }
690 splx(s);
691 n = i;
692
693 error = 0;
694 for (i = 0; i < n; i++) {
695 inp = inp_list[i];
696 if (inp->inp_gencnt <= gencnt) {
697 struct xinpcb xi;
698 xi.xi_len = sizeof xi;
699 /* XXX should avoid extra copy */
700 bcopy(inp, &xi.xi_inp, sizeof *inp);
701 if (inp->inp_socket)
702 sotoxsocket(inp->inp_socket, &xi.xi_socket);
703 error = SYSCTL_OUT(req, &xi, sizeof xi);
704 }
705 }
706 if (!error) {
707 /*
708 * Give the user an updated idea of our state.
709 * If the generation differs from what we told
710 * her before, she knows that something happened
711 * while we were processing this request, and it
712 * might be necessary to retry.
713 */
714 s = splnet();
715 xig.xig_gen = udbinfo.ipi_gencnt;
716 xig.xig_sogen = so_gencnt;
717 xig.xig_count = udbinfo.ipi_count;
718 splx(s);
719 error = SYSCTL_OUT(req, &xig, sizeof xig);
720 }
721 FREE(inp_list, M_TEMP);
722 return error;
723 }
724
725 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0,
726 udp_pcblist, "S,xinpcb", "List of active UDP sockets");
727
728
729
730 static int
731 udp_output(inp, m, addr, control, p)
732 register struct inpcb *inp;
733 struct mbuf *m;
734 struct sockaddr *addr;
735 struct mbuf *control;
736 struct proc *p;
737 {
738 register struct udpiphdr *ui;
739 register int len = m->m_pkthdr.len;
740 struct in_addr laddr;
741 int s = 0, error = 0;
742
743 KERNEL_DEBUG(DBG_FNC_UDP_OUTPUT | DBG_FUNC_START, 0,0,0,0,0);
744
745 if (control)
746 m_freem(control); /* XXX */
747
748 KERNEL_DEBUG(DBG_LAYER_OUT_BEG, inp->inp_fport, inp->inp_lport,
749 inp->inp_laddr.s_addr, inp->inp_faddr.s_addr,
750 (htons((u_short)len + sizeof (struct udphdr))));
751
752 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
753 error = EMSGSIZE;
754 goto release;
755 }
756
757 if (addr) {
758 laddr = inp->inp_laddr;
759 if (inp->inp_faddr.s_addr != INADDR_ANY) {
760 error = EISCONN;
761 goto release;
762 }
763 /*
764 * Must block input while temporarily connected.
765 */
766 s = splnet();
767 error = in_pcbconnect(inp, addr, p);
768 if (error) {
769 splx(s);
770 goto release;
771 }
772 } else {
773 if (inp->inp_faddr.s_addr == INADDR_ANY) {
774 error = ENOTCONN;
775 goto release;
776 }
777 }
778 /*
779 * Calculate data length and get a mbuf
780 * for UDP and IP headers.
781 */
782 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
783 if (m == 0) {
784 error = ENOBUFS;
785 if (addr)
786 splx(s);
787 goto release;
788 }
789
790 /*
791 * Fill in mbuf with extended UDP header
792 * and addresses and length put into network format.
793 */
794 ui = mtod(m, struct udpiphdr *);
795 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */
796 ui->ui_pr = IPPROTO_UDP;
797 ui->ui_src = inp->inp_laddr;
798 ui->ui_dst = inp->inp_faddr;
799 ui->ui_sport = inp->inp_lport;
800 ui->ui_dport = inp->inp_fport;
801 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
802
803 /*
804 * Set up checksum and output datagram.
805 */
806 if (udpcksum) {
807 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr,
808 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
809 m->m_pkthdr.csum_flags = CSUM_UDP;
810 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
811 } else {
812 ui->ui_sum = 0;
813 }
814 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
815 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */
816 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */
817 udpstat.udps_opackets++;
818
819 KERNEL_DEBUG(DBG_LAYER_OUT_END, ui->ui_dport, ui->ui_sport,
820 ui->ui_src.s_addr, ui->ui_dst.s_addr, ui->ui_ulen);
821
822 #if IPSEC
823 if (ipsec_bypass == 0 && ipsec_setsocket(m, inp->inp_socket) != 0) {
824 error = ENOBUFS;
825 goto release;
826 }
827 #endif /*IPSEC*/
828 error = ip_output(m, inp->inp_options, &inp->inp_route,
829 (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)),
830 inp->inp_moptions);
831
832 if (addr) {
833 in_pcbdisconnect(inp);
834 inp->inp_laddr = laddr; /* XXX rehash? */
835 splx(s);
836 }
837 KERNEL_DEBUG(DBG_FNC_UDP_OUTPUT | DBG_FUNC_END, error, 0,0,0,0);
838 return (error);
839
840 release:
841 m_freem(m);
842 KERNEL_DEBUG(DBG_FNC_UDP_OUTPUT | DBG_FUNC_END, error, 0,0,0,0);
843 return (error);
844 }
845
846 u_long udp_sendspace = 9216; /* really max datagram size */
847 /* 40 1K datagrams */
848 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
849 &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
850
851 u_long udp_recvspace = 40 * (1024 +
852 #if INET6
853 sizeof(struct sockaddr_in6)
854 #else
855 sizeof(struct sockaddr_in)
856 #endif
857 );
858 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
859 &udp_recvspace, 0, "Maximum incoming UDP datagram size");
860
861 static int
862 udp_abort(struct socket *so)
863 {
864 struct inpcb *inp;
865 int s;
866
867 inp = sotoinpcb(so);
868 if (inp == 0)
869 return EINVAL; /* ??? possible? panic instead? */
870 soisdisconnected(so);
871 s = splnet();
872 in_pcbdetach(inp);
873 splx(s);
874 return 0;
875 }
876
877 static int
878 udp_attach(struct socket *so, int proto, struct proc *p)
879 {
880 struct inpcb *inp;
881 int error; long s;
882
883 inp = sotoinpcb(so);
884 if (inp != 0)
885 return EINVAL;
886
887 error = soreserve(so, udp_sendspace, udp_recvspace);
888 if (error)
889 return error;
890 s = splnet();
891 error = in_pcballoc(so, &udbinfo, p);
892 splx(s);
893 if (error)
894 return error;
895 inp = (struct inpcb *)so->so_pcb;
896 inp->inp_vflag |= INP_IPV4;
897 inp->inp_ip_ttl = ip_defttl;
898 return 0;
899 }
900
901 static int
902 udp_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
903 {
904 struct inpcb *inp;
905 int s, error;
906
907 inp = sotoinpcb(so);
908 if (inp == 0)
909 return EINVAL;
910 s = splnet();
911 error = in_pcbbind(inp, nam, p);
912 splx(s);
913 return error;
914 }
915
916 static int
917 udp_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
918 {
919 struct inpcb *inp;
920 int s, error;
921
922 inp = sotoinpcb(so);
923 if (inp == 0)
924 return EINVAL;
925 if (inp->inp_faddr.s_addr != INADDR_ANY)
926 return EISCONN;
927 s = splnet();
928 error = in_pcbconnect(inp, nam, p);
929 splx(s);
930 if (error == 0)
931 soisconnected(so);
932 return error;
933 }
934
935 static int
936 udp_detach(struct socket *so)
937 {
938 struct inpcb *inp;
939 int s;
940
941 inp = sotoinpcb(so);
942 if (inp == 0)
943 return EINVAL;
944 s = splnet();
945 in_pcbdetach(inp);
946 splx(s);
947 return 0;
948 }
949
950 static int
951 udp_disconnect(struct socket *so)
952 {
953 struct inpcb *inp;
954 int s;
955
956 inp = sotoinpcb(so);
957 if (inp == 0)
958 return EINVAL;
959 if (inp->inp_faddr.s_addr == INADDR_ANY)
960 return ENOTCONN;
961
962 s = splnet();
963 in_pcbdisconnect(inp);
964 inp->inp_laddr.s_addr = INADDR_ANY;
965 splx(s);
966 so->so_state &= ~SS_ISCONNECTED; /* XXX */
967 return 0;
968 }
969
970 static int
971 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
972 struct mbuf *control, struct proc *p)
973 {
974 struct inpcb *inp;
975
976 inp = sotoinpcb(so);
977 if (inp == 0) {
978 m_freem(m);
979 return EINVAL;
980 }
981 return udp_output(inp, m, addr, control, p);
982 }
983
984 int
985 udp_shutdown(struct socket *so)
986 {
987 struct inpcb *inp;
988
989 inp = sotoinpcb(so);
990 if (inp == 0)
991 return EINVAL;
992 socantsendmore(so);
993 return 0;
994 }
995
996 struct pr_usrreqs udp_usrreqs = {
997 udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect,
998 pru_connect2_notsupp, in_control, udp_detach, udp_disconnect,
999 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp,
1000 pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown,
1001 in_setsockaddr, sosend, soreceive, sopoll
1002 };
1003
mirror of XNU