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Disk cache flush support.
[qemu/mini2440.git] / slirp / udp.c
blob0d7097027010c043faa998170f8b739a66ca2a5b
1 /*
2 * Copyright (c) 1982, 1986, 1988, 1990, 1993
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 8.4 (Berkeley) 1/21/94
34 * udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
35 */
36
37 /*
38 * Changes and additions relating to SLiRP
39 * Copyright (c) 1995 Danny Gasparovski.
40 *
41 * Please read the file COPYRIGHT for the
42 * terms and conditions of the copyright.
43 */
44
45 #include <slirp.h>
46 #include "ip_icmp.h"
47
48 struct udpstat udpstat;
49
50 struct socket udb;
51
52 /*
53 * UDP protocol implementation.
54 * Per RFC 768, August, 1980.
55 */
56 #ifndef COMPAT_42
57 int udpcksum = 1;
58 #else
59 int udpcksum = 0; /* XXX */
60 #endif
61
62 struct socket *udp_last_so = &udb;
63
64 void
65 udp_init()
66 {
67 udb.so_next = udb.so_prev = &udb;
68 }
69 /* m->m_data points at ip packet header
70 * m->m_len length ip packet
71 * ip->ip_len length data (IPDU)
72 */
73 void
74 udp_input(m, iphlen)
75 register struct mbuf *m;
76 int iphlen;
77 {
78 register struct ip *ip;
79 register struct udphdr *uh;
80 /* struct mbuf *opts = 0;*/
81 int len;
82 struct ip save_ip;
83 struct socket *so;
84
85 DEBUG_CALL("udp_input");
86 DEBUG_ARG("m = %lx", (long)m);
87 DEBUG_ARG("iphlen = %d", iphlen);
88
89 udpstat.udps_ipackets++;
90
91 /*
92 * Strip IP options, if any; should skip this,
93 * make available to user, and use on returned packets,
94 * but we don't yet have a way to check the checksum
95 * with options still present.
96 */
97 if(iphlen > sizeof(struct ip)) {
98 ip_stripoptions(m, (struct mbuf *)0);
99 iphlen = sizeof(struct ip);
100 }
101
102 /*
103 * Get IP and UDP header together in first mbuf.
104 */
105 ip = mtod(m, struct ip *);
106 uh = (struct udphdr *)((caddr_t)ip + iphlen);
107
108 /*
109 * Make mbuf data length reflect UDP length.
110 * If not enough data to reflect UDP length, drop.
111 */
112 len = ntohs((u_int16_t)uh->uh_ulen);
113
114 if (ip->ip_len != len) {
115 if (len > ip->ip_len) {
116 udpstat.udps_badlen++;
117 goto bad;
118 }
119 m_adj(m, len - ip->ip_len);
120 ip->ip_len = len;
121 }
122
123 /*
124 * Save a copy of the IP header in case we want restore it
125 * for sending an ICMP error message in response.
126 */
127 save_ip = *ip;
128 save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
129
130 /*
131 * Checksum extended UDP header and data.
132 */
133 if (udpcksum && uh->uh_sum) {
134 ((struct ipovly *)ip)->ih_next = 0;
135 ((struct ipovly *)ip)->ih_prev = 0;
136 ((struct ipovly *)ip)->ih_x1 = 0;
137 ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
138 /* keep uh_sum for ICMP reply
139 * uh->uh_sum = cksum(m, len + sizeof (struct ip));
140 * if (uh->uh_sum) {
141 */
142 if(cksum(m, len + sizeof(struct ip))) {
143 udpstat.udps_badsum++;
144 goto bad;
145 }
146 }
147
148 /*
149 * handle DHCP/BOOTP
150 */
151 if (ntohs(uh->uh_dport) == BOOTP_SERVER) {
152 bootp_input(m);
153 goto bad;
154 }
155
156 /*
157 * handle TFTP
158 */
159 if (ntohs(uh->uh_dport) == TFTP_SERVER) {
160 tftp_input(m);
161 goto bad;
162 }
163
164 /*
165 * Locate pcb for datagram.
166 */
167 so = udp_last_so;
168 if (so->so_lport != uh->uh_sport ||
169 so->so_laddr.s_addr != ip->ip_src.s_addr) {
170 struct socket *tmp;
171
172 for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) {
173 if (tmp->so_lport == uh->uh_sport &&
174 tmp->so_laddr.s_addr == ip->ip_src.s_addr) {
175 tmp->so_faddr.s_addr = ip->ip_dst.s_addr;
176 tmp->so_fport = uh->uh_dport;
177 so = tmp;
178 break;
179 }
180 }
181 if (tmp == &udb) {
182 so = NULL;
183 } else {
184 udpstat.udpps_pcbcachemiss++;
185 udp_last_so = so;
186 }
187 }
188
189 if (so == NULL) {
190 /*
191 * If there's no socket for this packet,
192 * create one
193 */
194 if ((so = socreate()) == NULL) goto bad;
195 if(udp_attach(so) == -1) {
196 DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
197 errno,strerror(errno)));
198 sofree(so);
199 goto bad;
200 }
201
202 /*
203 * Setup fields
204 */
205 /* udp_last_so = so; */
206 so->so_laddr = ip->ip_src;
207 so->so_lport = uh->uh_sport;
208 so->so_faddr = ip->ip_dst; /* XXX */
209 so->so_fport = uh->uh_dport; /* XXX */
210
211 if ((so->so_iptos = udp_tos(so)) == 0)
212 so->so_iptos = ip->ip_tos;
213
214 /*
215 * XXXXX Here, check if it's in udpexec_list,
216 * and if it is, do the fork_exec() etc.
217 */
218 }
219
220 iphlen += sizeof(struct udphdr);
221 m->m_len -= iphlen;
222 m->m_data += iphlen;
223
224 /*
225 * Now we sendto() the packet.
226 */
227 if (so->so_emu)
228 udp_emu(so, m);
229
230 if(sosendto(so,m) == -1) {
231 m->m_len += iphlen;
232 m->m_data -= iphlen;
233 *ip=save_ip;
234 DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
235 icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
236 }
237
238 m_free(so->so_m); /* used for ICMP if error on sorecvfrom */
239
240 /* restore the orig mbuf packet */
241 m->m_len += iphlen;
242 m->m_data -= iphlen;
243 *ip=save_ip;
244 so->so_m=m; /* ICMP backup */
245
246 return;
247 bad:
248 m_freem(m);
249 /* if (opts) m_freem(opts); */
250 return;
251 }
252
253 int udp_output2(struct socket *so, struct mbuf *m,
254 struct sockaddr_in *saddr, struct sockaddr_in *daddr,
255 int iptos)
256 {
257 register struct udpiphdr *ui;
258 int error = 0;
259
260 DEBUG_CALL("udp_output");
261 DEBUG_ARG("so = %lx", (long)so);
262 DEBUG_ARG("m = %lx", (long)m);
263 DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
264 DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
265
266 /*
267 * Adjust for header
268 */
269 m->m_data -= sizeof(struct udpiphdr);
270 m->m_len += sizeof(struct udpiphdr);
271
272 /*
273 * Fill in mbuf with extended UDP header
274 * and addresses and length put into network format.
275 */
276 ui = mtod(m, struct udpiphdr *);
277 ui->ui_next = ui->ui_prev = 0;
278 ui->ui_x1 = 0;
279 ui->ui_pr = IPPROTO_UDP;
280 ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */
281 /* XXXXX Check for from-one-location sockets, or from-any-location sockets */
282 ui->ui_src = saddr->sin_addr;
283 ui->ui_dst = daddr->sin_addr;
284 ui->ui_sport = saddr->sin_port;
285 ui->ui_dport = daddr->sin_port;
286 ui->ui_ulen = ui->ui_len;
287
288 /*
289 * Stuff checksum and output datagram.
290 */
291 ui->ui_sum = 0;
292 if (udpcksum) {
293 if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
294 ui->ui_sum = 0xffff;
295 }
296 ((struct ip *)ui)->ip_len = m->m_len;
297
298 ((struct ip *)ui)->ip_ttl = ip_defttl;
299 ((struct ip *)ui)->ip_tos = iptos;
300
301 udpstat.udps_opackets++;
302
303 error = ip_output(so, m);
304
305 return (error);
306 }
307
308 int udp_output(struct socket *so, struct mbuf *m,
309 struct sockaddr_in *addr)
310
311 {
312 struct sockaddr_in saddr, daddr;
313
314 saddr = *addr;
315 if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
316 saddr.sin_addr.s_addr = so->so_faddr.s_addr;
317 if ((so->so_faddr.s_addr & htonl(0x000000ff)) == htonl(0xff))
318 saddr.sin_addr.s_addr = alias_addr.s_addr;
319 }
320 daddr.sin_addr = so->so_laddr;
321 daddr.sin_port = so->so_lport;
322
323 return udp_output2(so, m, &saddr, &daddr, so->so_iptos);
324 }
325
326 int
327 udp_attach(so)
328 struct socket *so;
329 {
330 struct sockaddr_in addr;
331
332 if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) {
333 /*
334 * Here, we bind() the socket. Although not really needed
335 * (sendto() on an unbound socket will bind it), it's done
336 * here so that emulation of ytalk etc. don't have to do it
337 */
338 addr.sin_family = AF_INET;
339 addr.sin_port = 0;
340 addr.sin_addr.s_addr = INADDR_ANY;
341 if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) {
342 int lasterrno=errno;
343 closesocket(so->s);
344 so->s=-1;
345 #ifdef _WIN32
346 WSASetLastError(lasterrno);
347 #else
348 errno=lasterrno;
349 #endif
350 } else {
351 /* success, insert in queue */
352 so->so_expire = curtime + SO_EXPIRE;
353 insque(so,&udb);
354 }
355 }
356 return(so->s);
357 }
358
359 void
360 udp_detach(so)
361 struct socket *so;
362 {
363 closesocket(so->s);
364 /* if (so->so_m) m_free(so->so_m); done by sofree */
365
366 sofree(so);
367 }
368
369 struct tos_t udptos[] = {
370 {0, 53, IPTOS_LOWDELAY, 0}, /* DNS */
371 {517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */
372 {518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */
373 {0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */
374 {0, 0, 0, 0}
375 };
376
377 u_int8_t
378 udp_tos(so)
379 struct socket *so;
380 {
381 int i = 0;
382
383 while(udptos[i].tos) {
384 if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) ||
385 (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) {
386 so->so_emu = udptos[i].emu;
387 return udptos[i].tos;
388 }
389 i++;
390 }
391
392 return 0;
393 }
394
395 #ifdef EMULATE_TALK
396 #include "talkd.h"
397 #endif
398
399 /*
400 * Here, talk/ytalk/ntalk requests must be emulated
401 */
402 void
403 udp_emu(so, m)
404 struct socket *so;
405 struct mbuf *m;
406 {
407 struct sockaddr_in addr;
408 int addrlen = sizeof(addr);
409 #ifdef EMULATE_TALK
410 CTL_MSG_OLD *omsg;
411 CTL_MSG *nmsg;
412 char buff[sizeof(CTL_MSG)];
413 u_char type;
414
415 struct talk_request {
416 struct talk_request *next;
417 struct socket *udp_so;
418 struct socket *tcp_so;
419 } *req;
420
421 static struct talk_request *req_tbl = 0;
422
423 #endif
424
425 struct cu_header {
426 uint16_t d_family; // destination family
427 uint16_t d_port; // destination port
428 uint32_t d_addr; // destination address
429 uint16_t s_family; // source family
430 uint16_t s_port; // source port
431 uint32_t so_addr; // source address
432 uint32_t seqn; // sequence number
433 uint16_t message; // message
434 uint16_t data_type; // data type
435 uint16_t pkt_len; // packet length
436 } *cu_head;
437
438 switch(so->so_emu) {
439
440 #ifdef EMULATE_TALK
441 case EMU_TALK:
442 case EMU_NTALK:
443 /*
444 * Talk emulation. We always change the ctl_addr to get
445 * some answers from the daemon. When an ANNOUNCE comes,
446 * we send LEAVE_INVITE to the local daemons. Also when a
447 * DELETE comes, we send copies to the local daemons.
448 */
449 if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
450 return;
451
452 #define IS_OLD (so->so_emu == EMU_TALK)
453
454 #define COPY_MSG(dest, src) { dest->type = src->type; \
455 dest->id_num = src->id_num; \
456 dest->pid = src->pid; \
457 dest->addr = src->addr; \
458 dest->ctl_addr = src->ctl_addr; \
459 memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
460 memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
461 memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); }
462
463 #define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
464 /* old_sockaddr to sockaddr_in */
465
466
467 if (IS_OLD) { /* old talk */
468 omsg = mtod(m, CTL_MSG_OLD*);
469 nmsg = (CTL_MSG *) buff;
470 type = omsg->type;
471 OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
472 OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
473 strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
474 } else { /* new talk */
475 omsg = (CTL_MSG_OLD *) buff;
476 nmsg = mtod(m, CTL_MSG *);
477 type = nmsg->type;
478 OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
479 OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
480 strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
481 }
482
483 if (type == LOOK_UP)
484 return; /* for LOOK_UP this is enough */
485
486 if (IS_OLD) { /* make a copy of the message */
487 COPY_MSG(nmsg, omsg);
488 nmsg->vers = 1;
489 nmsg->answer = 0;
490 } else
491 COPY_MSG(omsg, nmsg);
492
493 /*
494 * If if is an ANNOUNCE message, we go through the
495 * request table to see if a tcp port has already
496 * been redirected for this socket. If not, we solisten()
497 * a new socket and add this entry to the table.
498 * The port number of the tcp socket and our IP
499 * are put to the addr field of the message structures.
500 * Then a LEAVE_INVITE is sent to both local daemon
501 * ports, 517 and 518. This is why we have two copies
502 * of the message, one in old talk and one in new talk
503 * format.
504 */
505
506 if (type == ANNOUNCE) {
507 int s;
508 u_short temp_port;
509
510 for(req = req_tbl; req; req = req->next)
511 if (so == req->udp_so)
512 break; /* found it */
513
514 if (!req) { /* no entry for so, create new */
515 req = (struct talk_request *)
516 malloc(sizeof(struct talk_request));
517 req->udp_so = so;
518 req->tcp_so = solisten(0,
519 OTOSIN(omsg, addr)->sin_addr.s_addr,
520 OTOSIN(omsg, addr)->sin_port,
521 SS_FACCEPTONCE);
522 req->next = req_tbl;
523 req_tbl = req;
524 }
525
526 /* replace port number in addr field */
527 addrlen = sizeof(addr);
528 getsockname(req->tcp_so->s,
529 (struct sockaddr *) &addr,
530 &addrlen);
531 OTOSIN(omsg, addr)->sin_port = addr.sin_port;
532 OTOSIN(omsg, addr)->sin_addr = our_addr;
533 OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
534 OTOSIN(nmsg, addr)->sin_addr = our_addr;
535
536 /* send LEAVE_INVITEs */
537 temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
538 OTOSIN(omsg, ctl_addr)->sin_port = 0;
539 OTOSIN(nmsg, ctl_addr)->sin_port = 0;
540 omsg->type = nmsg->type = LEAVE_INVITE;
541
542 s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
543 addr.sin_addr = our_addr;
544 addr.sin_family = AF_INET;
545 addr.sin_port = htons(517);
546 sendto(s, (char *)omsg, sizeof(*omsg), 0,
547 (struct sockaddr *)&addr, sizeof(addr));
548 addr.sin_port = htons(518);
549 sendto(s, (char *)nmsg, sizeof(*nmsg), 0,
550 (struct sockaddr *) &addr, sizeof(addr));
551 closesocket(s) ;
552
553 omsg->type = nmsg->type = ANNOUNCE;
554 OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
555 OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
556 }
557
558 /*
559 * If it is a DELETE message, we send a copy to the
560 * local daemons. Then we delete the entry corresponding
561 * to our socket from the request table.
562 */
563
564 if (type == DELETE) {
565 struct talk_request *temp_req, *req_next;
566 int s;
567 u_short temp_port;
568
569 temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
570 OTOSIN(omsg, ctl_addr)->sin_port = 0;
571 OTOSIN(nmsg, ctl_addr)->sin_port = 0;
572
573 s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
574 addr.sin_addr = our_addr;
575 addr.sin_family = AF_INET;
576 addr.sin_port = htons(517);
577 sendto(s, (char *)omsg, sizeof(*omsg), 0,
578 (struct sockaddr *)&addr, sizeof(addr));
579 addr.sin_port = htons(518);
580 sendto(s, (char *)nmsg, sizeof(*nmsg), 0,
581 (struct sockaddr *)&addr, sizeof(addr));
582 closesocket(s);
583
584 OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
585 OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
586
587 /* delete table entry */
588 if (so == req_tbl->udp_so) {
589 temp_req = req_tbl;
590 req_tbl = req_tbl->next;
591 free(temp_req);
592 } else {
593 temp_req = req_tbl;
594 for(req = req_tbl->next; req; req = req_next) {
595 req_next = req->next;
596 if (so == req->udp_so) {
597 temp_req->next = req_next;
598 free(req);
599 break;
600 } else {
601 temp_req = req;
602 }
603 }
604 }
605 }
606
607 return;
608 #endif
609
610 case EMU_CUSEEME:
611
612 /*
613 * Cu-SeeMe emulation.
614 * Hopefully the packet is more that 16 bytes long. We don't
615 * do any other tests, just replace the address and port
616 * fields.
617 */
618 if (m->m_len >= sizeof (*cu_head)) {
619 if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
620 return;
621 cu_head = mtod(m, struct cu_header *);
622 cu_head->s_port = addr.sin_port;
623 cu_head->so_addr = our_addr.s_addr;
624 }
625
626 return;
627 }
628 }
629
630 struct socket *
631 udp_listen(port, laddr, lport, flags)
632 u_int port;
633 u_int32_t laddr;
634 u_int lport;
635 int flags;
636 {
637 struct sockaddr_in addr;
638 struct socket *so;
639 int addrlen = sizeof(struct sockaddr_in), opt = 1;
640
641 if ((so = socreate()) == NULL) {
642 free(so);
643 return NULL;
644 }
645 so->s = socket(AF_INET,SOCK_DGRAM,0);
646 so->so_expire = curtime + SO_EXPIRE;
647 insque(so,&udb);
648
649 addr.sin_family = AF_INET;
650 addr.sin_addr.s_addr = INADDR_ANY;
651 addr.sin_port = port;
652
653 if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
654 udp_detach(so);
655 return NULL;
656 }
657 setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
658 /* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); */
659
660 getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
661 so->so_fport = addr.sin_port;
662 if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr)
663 so->so_faddr = alias_addr;
664 else
665 so->so_faddr = addr.sin_addr;
666
667 so->so_lport = lport;
668 so->so_laddr.s_addr = laddr;
669 if (flags != SS_FACCEPTONCE)
670 so->so_expire = 0;
671
672 so->so_state = SS_ISFCONNECTED;
673
674 return so;
675 }
Samsung s3c2440 and arm920t support for the mini2440 dev board