gdbstub: x86: Refactor register access
[qemu/mdroth.git] / slirp / udp.c
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1 /*
2 * Copyright (c) 1982, 1986, 1988, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
29 * @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
30 * udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
34 * Changes and additions relating to SLiRP
35 * Copyright (c) 1995 Danny Gasparovski.
37 * Please read the file COPYRIGHT for the
38 * terms and conditions of the copyright.
41 #include <slirp.h>
42 #include "ip_icmp.h"
44 static u_int8_t udp_tos(struct socket *so);
45 static void udp_emu(struct socket *so, struct mbuf *m);
47 void
48 udp_init(Slirp *slirp)
50 slirp->udb.so_next = slirp->udb.so_prev = &slirp->udb;
51 slirp->udp_last_so = &slirp->udb;
53 /* m->m_data points at ip packet header
54 * m->m_len length ip packet
55 * ip->ip_len length data (IPDU)
57 void
58 udp_input(register struct mbuf *m, int iphlen)
60 Slirp *slirp = m->slirp;
61 register struct ip *ip;
62 register struct udphdr *uh;
63 int len;
64 struct ip save_ip;
65 struct socket *so;
67 DEBUG_CALL("udp_input");
68 DEBUG_ARG("m = %lx", (long)m);
69 DEBUG_ARG("iphlen = %d", iphlen);
72 * Strip IP options, if any; should skip this,
73 * make available to user, and use on returned packets,
74 * but we don't yet have a way to check the checksum
75 * with options still present.
77 if(iphlen > sizeof(struct ip)) {
78 ip_stripoptions(m, (struct mbuf *)0);
79 iphlen = sizeof(struct ip);
83 * Get IP and UDP header together in first mbuf.
85 ip = mtod(m, struct ip *);
86 uh = (struct udphdr *)((caddr_t)ip + iphlen);
89 * Make mbuf data length reflect UDP length.
90 * If not enough data to reflect UDP length, drop.
92 len = ntohs((u_int16_t)uh->uh_ulen);
94 if (ip->ip_len != len) {
95 if (len > ip->ip_len) {
96 goto bad;
98 m_adj(m, len - ip->ip_len);
99 ip->ip_len = len;
103 * Save a copy of the IP header in case we want restore it
104 * for sending an ICMP error message in response.
106 save_ip = *ip;
107 save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
110 * Checksum extended UDP header and data.
112 if (uh->uh_sum) {
113 memset(&((struct ipovly *)ip)->ih_mbuf, 0, sizeof(struct mbuf_ptr));
114 ((struct ipovly *)ip)->ih_x1 = 0;
115 ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
116 if(cksum(m, len + sizeof(struct ip))) {
117 goto bad;
122 * handle DHCP/BOOTP
124 if (ntohs(uh->uh_dport) == BOOTP_SERVER) {
125 bootp_input(m);
126 goto bad;
129 if (slirp->restricted) {
130 goto bad;
134 * handle TFTP
136 if (ntohs(uh->uh_dport) == TFTP_SERVER) {
137 tftp_input(m);
138 goto bad;
142 * Locate pcb for datagram.
144 so = slirp->udp_last_so;
145 if (so->so_lport != uh->uh_sport ||
146 so->so_laddr.s_addr != ip->ip_src.s_addr) {
147 struct socket *tmp;
149 for (tmp = slirp->udb.so_next; tmp != &slirp->udb;
150 tmp = tmp->so_next) {
151 if (tmp->so_lport == uh->uh_sport &&
152 tmp->so_laddr.s_addr == ip->ip_src.s_addr) {
153 so = tmp;
154 break;
157 if (tmp == &slirp->udb) {
158 so = NULL;
159 } else {
160 slirp->udp_last_so = so;
164 if (so == NULL) {
166 * If there's no socket for this packet,
167 * create one
169 so = socreate(slirp);
170 if (!so) {
171 goto bad;
173 if(udp_attach(so) == -1) {
174 DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
175 errno,strerror(errno)));
176 sofree(so);
177 goto bad;
181 * Setup fields
183 so->so_laddr = ip->ip_src;
184 so->so_lport = uh->uh_sport;
186 if ((so->so_iptos = udp_tos(so)) == 0)
187 so->so_iptos = ip->ip_tos;
190 * XXXXX Here, check if it's in udpexec_list,
191 * and if it is, do the fork_exec() etc.
195 so->so_faddr = ip->ip_dst; /* XXX */
196 so->so_fport = uh->uh_dport; /* XXX */
198 iphlen += sizeof(struct udphdr);
199 m->m_len -= iphlen;
200 m->m_data += iphlen;
203 * Now we sendto() the packet.
205 if (so->so_emu)
206 udp_emu(so, m);
208 if(sosendto(so,m) == -1) {
209 m->m_len += iphlen;
210 m->m_data -= iphlen;
211 *ip=save_ip;
212 DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
213 icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
216 m_free(so->so_m); /* used for ICMP if error on sorecvfrom */
218 /* restore the orig mbuf packet */
219 m->m_len += iphlen;
220 m->m_data -= iphlen;
221 *ip=save_ip;
222 so->so_m=m; /* ICMP backup */
224 return;
225 bad:
226 m_freem(m);
227 return;
230 int udp_output2(struct socket *so, struct mbuf *m,
231 struct sockaddr_in *saddr, struct sockaddr_in *daddr,
232 int iptos)
234 register struct udpiphdr *ui;
235 int error = 0;
237 DEBUG_CALL("udp_output");
238 DEBUG_ARG("so = %lx", (long)so);
239 DEBUG_ARG("m = %lx", (long)m);
240 DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
241 DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
244 * Adjust for header
246 m->m_data -= sizeof(struct udpiphdr);
247 m->m_len += sizeof(struct udpiphdr);
250 * Fill in mbuf with extended UDP header
251 * and addresses and length put into network format.
253 ui = mtod(m, struct udpiphdr *);
254 memset(&ui->ui_i.ih_mbuf, 0 , sizeof(struct mbuf_ptr));
255 ui->ui_x1 = 0;
256 ui->ui_pr = IPPROTO_UDP;
257 ui->ui_len = htons(m->m_len - sizeof(struct ip));
258 /* XXXXX Check for from-one-location sockets, or from-any-location sockets */
259 ui->ui_src = saddr->sin_addr;
260 ui->ui_dst = daddr->sin_addr;
261 ui->ui_sport = saddr->sin_port;
262 ui->ui_dport = daddr->sin_port;
263 ui->ui_ulen = ui->ui_len;
266 * Stuff checksum and output datagram.
268 ui->ui_sum = 0;
269 if ((ui->ui_sum = cksum(m, m->m_len)) == 0)
270 ui->ui_sum = 0xffff;
271 ((struct ip *)ui)->ip_len = m->m_len;
273 ((struct ip *)ui)->ip_ttl = IPDEFTTL;
274 ((struct ip *)ui)->ip_tos = iptos;
276 error = ip_output(so, m);
278 return (error);
281 int udp_output(struct socket *so, struct mbuf *m,
282 struct sockaddr_in *addr)
285 Slirp *slirp = so->slirp;
286 struct sockaddr_in saddr, daddr;
288 saddr = *addr;
289 if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
290 slirp->vnetwork_addr.s_addr) {
291 uint32_t inv_mask = ~slirp->vnetwork_mask.s_addr;
293 if ((so->so_faddr.s_addr & inv_mask) == inv_mask) {
294 saddr.sin_addr = slirp->vhost_addr;
295 } else if (addr->sin_addr.s_addr == loopback_addr.s_addr ||
296 so->so_faddr.s_addr != slirp->vhost_addr.s_addr) {
297 saddr.sin_addr = so->so_faddr;
300 daddr.sin_addr = so->so_laddr;
301 daddr.sin_port = so->so_lport;
303 return udp_output2(so, m, &saddr, &daddr, so->so_iptos);
307 udp_attach(struct socket *so)
309 struct sockaddr_in addr;
311 if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) {
313 * Here, we bind() the socket. Although not really needed
314 * (sendto() on an unbound socket will bind it), it's done
315 * here so that emulation of ytalk etc. don't have to do it
317 addr.sin_family = AF_INET;
318 addr.sin_port = 0;
319 addr.sin_addr.s_addr = INADDR_ANY;
320 if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) {
321 int lasterrno=errno;
322 closesocket(so->s);
323 so->s=-1;
324 #ifdef _WIN32
325 WSASetLastError(lasterrno);
326 #else
327 errno=lasterrno;
328 #endif
329 } else {
330 /* success, insert in queue */
331 so->so_expire = curtime + SO_EXPIRE;
332 insque(so, &so->slirp->udb);
335 return(so->s);
338 void
339 udp_detach(struct socket *so)
341 closesocket(so->s);
342 sofree(so);
345 static const struct tos_t udptos[] = {
346 {0, 53, IPTOS_LOWDELAY, 0}, /* DNS */
347 {517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */
348 {518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */
349 {0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */
350 {0, 0, 0, 0}
353 static u_int8_t
354 udp_tos(struct socket *so)
356 int i = 0;
358 while(udptos[i].tos) {
359 if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) ||
360 (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) {
361 so->so_emu = udptos[i].emu;
362 return udptos[i].tos;
364 i++;
367 return 0;
370 #ifdef EMULATE_TALK
371 #include "talkd.h"
372 #endif
375 * Here, talk/ytalk/ntalk requests must be emulated
377 static void
378 udp_emu(struct socket *so, struct mbuf *m)
380 struct sockaddr_in addr;
381 socklen_t addrlen = sizeof(addr);
382 #ifdef EMULATE_TALK
383 CTL_MSG_OLD *omsg;
384 CTL_MSG *nmsg;
385 char buff[sizeof(CTL_MSG)];
386 u_char type;
388 struct talk_request {
389 struct talk_request *next;
390 struct socket *udp_so;
391 struct socket *tcp_so;
392 } *req;
394 static struct talk_request *req_tbl = 0;
396 #endif
398 struct cu_header {
399 uint16_t d_family; // destination family
400 uint16_t d_port; // destination port
401 uint32_t d_addr; // destination address
402 uint16_t s_family; // source family
403 uint16_t s_port; // source port
404 uint32_t so_addr; // source address
405 uint32_t seqn; // sequence number
406 uint16_t message; // message
407 uint16_t data_type; // data type
408 uint16_t pkt_len; // packet length
409 } *cu_head;
411 switch(so->so_emu) {
413 #ifdef EMULATE_TALK
414 case EMU_TALK:
415 case EMU_NTALK:
417 * Talk emulation. We always change the ctl_addr to get
418 * some answers from the daemon. When an ANNOUNCE comes,
419 * we send LEAVE_INVITE to the local daemons. Also when a
420 * DELETE comes, we send copies to the local daemons.
422 if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
423 return;
425 #define IS_OLD (so->so_emu == EMU_TALK)
427 #define COPY_MSG(dest, src) { dest->type = src->type; \
428 dest->id_num = src->id_num; \
429 dest->pid = src->pid; \
430 dest->addr = src->addr; \
431 dest->ctl_addr = src->ctl_addr; \
432 memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
433 memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
434 memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); }
436 #define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
437 /* old_sockaddr to sockaddr_in */
440 if (IS_OLD) { /* old talk */
441 omsg = mtod(m, CTL_MSG_OLD*);
442 nmsg = (CTL_MSG *) buff;
443 type = omsg->type;
444 OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
445 OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
446 pstrcpy(omsg->l_name, NAME_SIZE_OLD, getlogin());
447 } else { /* new talk */
448 omsg = (CTL_MSG_OLD *) buff;
449 nmsg = mtod(m, CTL_MSG *);
450 type = nmsg->type;
451 OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
452 OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
453 pstrcpy(nmsg->l_name, NAME_SIZE_OLD, getlogin());
456 if (type == LOOK_UP)
457 return; /* for LOOK_UP this is enough */
459 if (IS_OLD) { /* make a copy of the message */
460 COPY_MSG(nmsg, omsg);
461 nmsg->vers = 1;
462 nmsg->answer = 0;
463 } else
464 COPY_MSG(omsg, nmsg);
467 * If if is an ANNOUNCE message, we go through the
468 * request table to see if a tcp port has already
469 * been redirected for this socket. If not, we solisten()
470 * a new socket and add this entry to the table.
471 * The port number of the tcp socket and our IP
472 * are put to the addr field of the message structures.
473 * Then a LEAVE_INVITE is sent to both local daemon
474 * ports, 517 and 518. This is why we have two copies
475 * of the message, one in old talk and one in new talk
476 * format.
479 if (type == ANNOUNCE) {
480 int s;
481 u_short temp_port;
483 for(req = req_tbl; req; req = req->next)
484 if (so == req->udp_so)
485 break; /* found it */
487 if (!req) { /* no entry for so, create new */
488 req = (struct talk_request *)
489 malloc(sizeof(struct talk_request));
490 req->udp_so = so;
491 req->tcp_so = solisten(0,
492 OTOSIN(omsg, addr)->sin_addr.s_addr,
493 OTOSIN(omsg, addr)->sin_port,
494 SS_FACCEPTONCE);
495 req->next = req_tbl;
496 req_tbl = req;
499 /* replace port number in addr field */
500 addrlen = sizeof(addr);
501 getsockname(req->tcp_so->s,
502 (struct sockaddr *) &addr,
503 &addrlen);
504 OTOSIN(omsg, addr)->sin_port = addr.sin_port;
505 OTOSIN(omsg, addr)->sin_addr = our_addr;
506 OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
507 OTOSIN(nmsg, addr)->sin_addr = our_addr;
509 /* send LEAVE_INVITEs */
510 temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
511 OTOSIN(omsg, ctl_addr)->sin_port = 0;
512 OTOSIN(nmsg, ctl_addr)->sin_port = 0;
513 omsg->type = nmsg->type = LEAVE_INVITE;
515 s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
516 addr.sin_addr = our_addr;
517 addr.sin_family = AF_INET;
518 addr.sin_port = htons(517);
519 sendto(s, (char *)omsg, sizeof(*omsg), 0,
520 (struct sockaddr *)&addr, sizeof(addr));
521 addr.sin_port = htons(518);
522 sendto(s, (char *)nmsg, sizeof(*nmsg), 0,
523 (struct sockaddr *) &addr, sizeof(addr));
524 closesocket(s) ;
526 omsg->type = nmsg->type = ANNOUNCE;
527 OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
528 OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
532 * If it is a DELETE message, we send a copy to the
533 * local daemons. Then we delete the entry corresponding
534 * to our socket from the request table.
537 if (type == DELETE) {
538 struct talk_request *temp_req, *req_next;
539 int s;
540 u_short temp_port;
542 temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
543 OTOSIN(omsg, ctl_addr)->sin_port = 0;
544 OTOSIN(nmsg, ctl_addr)->sin_port = 0;
546 s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
547 addr.sin_addr = our_addr;
548 addr.sin_family = AF_INET;
549 addr.sin_port = htons(517);
550 sendto(s, (char *)omsg, sizeof(*omsg), 0,
551 (struct sockaddr *)&addr, sizeof(addr));
552 addr.sin_port = htons(518);
553 sendto(s, (char *)nmsg, sizeof(*nmsg), 0,
554 (struct sockaddr *)&addr, sizeof(addr));
555 closesocket(s);
557 OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
558 OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
560 /* delete table entry */
561 if (so == req_tbl->udp_so) {
562 temp_req = req_tbl;
563 req_tbl = req_tbl->next;
564 free(temp_req);
565 } else {
566 temp_req = req_tbl;
567 for(req = req_tbl->next; req; req = req_next) {
568 req_next = req->next;
569 if (so == req->udp_so) {
570 temp_req->next = req_next;
571 free(req);
572 break;
573 } else {
574 temp_req = req;
580 return;
581 #endif
583 case EMU_CUSEEME:
586 * Cu-SeeMe emulation.
587 * Hopefully the packet is more that 16 bytes long. We don't
588 * do any other tests, just replace the address and port
589 * fields.
591 if (m->m_len >= sizeof (*cu_head)) {
592 if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
593 return;
594 cu_head = mtod(m, struct cu_header *);
595 cu_head->s_port = addr.sin_port;
596 cu_head->so_addr = our_addr.s_addr;
599 return;
603 struct socket *
604 udp_listen(Slirp *slirp, u_int32_t haddr, u_int hport, u_int32_t laddr,
605 u_int lport, int flags)
607 struct sockaddr_in addr;
608 struct socket *so;
609 socklen_t addrlen = sizeof(struct sockaddr_in), opt = 1;
611 so = socreate(slirp);
612 if (!so) {
613 return NULL;
615 so->s = socket(AF_INET,SOCK_DGRAM,0);
616 so->so_expire = curtime + SO_EXPIRE;
617 insque(so, &slirp->udb);
619 addr.sin_family = AF_INET;
620 addr.sin_addr.s_addr = haddr;
621 addr.sin_port = hport;
623 if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
624 udp_detach(so);
625 return NULL;
627 setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
629 getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
630 so->so_fport = addr.sin_port;
631 if (addr.sin_addr.s_addr == 0 ||
632 addr.sin_addr.s_addr == loopback_addr.s_addr) {
633 so->so_faddr = slirp->vhost_addr;
634 } else {
635 so->so_faddr = addr.sin_addr;
637 so->so_lport = lport;
638 so->so_laddr.s_addr = laddr;
639 if (flags != SS_FACCEPTONCE)
640 so->so_expire = 0;
642 so->so_state &= SS_PERSISTENT_MASK;
643 so->so_state |= SS_ISFCONNECTED | flags;
645 return so;