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root/cebix/BasiliskII/src/slirp/socket.c
Revision: 1.6
Committed: 2007-11-03T11:11:42Z (17 years, 1 month ago) by gbeauche
Content type: text/plain
Branch: MAIN
CVS Tags: HEAD
Changes since 1.5: +4 -1 lines
Log Message: 
Update to slirp sources from QEMU 0.8.2:
- set slirp client hostname
- fix slirp redirection on systems without a useful host IP address
- separate alias_addr (10.0.2.2) from our_addr (Ed Swierk)
- fix 32+ KB packets handling (Ed Swierk)
- fix UDP broadcast translation error
- solaris port (Ben Taylor)

File Contents

# Content
1 /*
2 * Copyright (c) 1995 Danny Gasparovski.
3 *
4 * Please read the file COPYRIGHT for the
5 * terms and conditions of the copyright.
6 */
7
8 #define WANT_SYS_IOCTL_H
9 #include <stdlib.h>
10 #include <slirp.h>
11 #include "ip_icmp.h"
12 #include "main.h"
13 #ifdef __sun__
14 #include <sys/filio.h>
15 #endif
16
17 void
18 so_init()
19 {
20 /* Nothing yet */
21 }
22
23
24 struct socket *
25 solookup(head, laddr, lport, faddr, fport)
26 struct socket *head;
27 struct in_addr laddr;
28 u_int lport;
29 struct in_addr faddr;
30 u_int fport;
31 {
32 struct socket *so;
33
34 for (so = head->so_next; so != head; so = so->so_next) {
35 if (so->so_lport == lport &&
36 so->so_laddr.s_addr == laddr.s_addr &&
37 so->so_faddr.s_addr == faddr.s_addr &&
38 so->so_fport == fport)
39 break;
40 }
41
42 if (so == head)
43 return (struct socket *)NULL;
44 return so;
45
46 }
47
48 /*
49 * Create a new socket, initialise the fields
50 * It is the responsibility of the caller to
51 * insque() it into the correct linked-list
52 */
53 struct socket *
54 socreate()
55 {
56 struct socket *so;
57
58 so = (struct socket *)malloc(sizeof(struct socket));
59 if(so) {
60 memset(so, 0, sizeof(struct socket));
61 so->so_state = SS_NOFDREF;
62 so->s = -1;
63 }
64 return(so);
65 }
66
67 /*
68 * remque and free a socket, clobber cache
69 */
70 void
71 sofree(so)
72 struct socket *so;
73 {
74 if (so->so_emu==EMU_RSH && so->extra) {
75 sofree(so->extra);
76 so->extra=NULL;
77 }
78 if (so == tcp_last_so)
79 tcp_last_so = &tcb;
80 else if (so == udp_last_so)
81 udp_last_so = &udb;
82
83 m_free(so->so_m);
84
85 if(so->so_next && so->so_prev)
86 remque(so); /* crashes if so is not in a queue */
87
88 free(so);
89 }
90
91 /*
92 * Read from so's socket into sb_snd, updating all relevant sbuf fields
93 * NOTE: This will only be called if it is select()ed for reading, so
94 * a read() of 0 (or less) means it's disconnected
95 */
96 int
97 soread(so)
98 struct socket *so;
99 {
100 int n, nn, lss, total;
101 struct sbuf *sb = &so->so_snd;
102 int len = sb->sb_datalen - sb->sb_cc;
103 struct iovec iov[2];
104 int mss = so->so_tcpcb->t_maxseg;
105
106 DEBUG_CALL("soread");
107 DEBUG_ARG("so = %lx", (long )so);
108
109 /*
110 * No need to check if there's enough room to read.
111 * soread wouldn't have been called if there weren't
112 */
113
114 len = sb->sb_datalen - sb->sb_cc;
115
116 iov[0].iov_base = sb->sb_wptr;
117 if (sb->sb_wptr < sb->sb_rptr) {
118 iov[0].iov_len = sb->sb_rptr - sb->sb_wptr;
119 /* Should never succeed, but... */
120 if (iov[0].iov_len > len)
121 iov[0].iov_len = len;
122 if (iov[0].iov_len > mss)
123 iov[0].iov_len -= iov[0].iov_len%mss;
124 n = 1;
125 } else {
126 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_wptr;
127 /* Should never succeed, but... */
128 if (iov[0].iov_len > len) iov[0].iov_len = len;
129 len -= iov[0].iov_len;
130 if (len) {
131 iov[1].iov_base = sb->sb_data;
132 iov[1].iov_len = sb->sb_rptr - sb->sb_data;
133 if(iov[1].iov_len > len)
134 iov[1].iov_len = len;
135 total = iov[0].iov_len + iov[1].iov_len;
136 if (total > mss) {
137 lss = total%mss;
138 if (iov[1].iov_len > lss) {
139 iov[1].iov_len -= lss;
140 n = 2;
141 } else {
142 lss -= iov[1].iov_len;
143 iov[0].iov_len -= lss;
144 n = 1;
145 }
146 } else
147 n = 2;
148 } else {
149 if (iov[0].iov_len > mss)
150 iov[0].iov_len -= iov[0].iov_len%mss;
151 n = 1;
152 }
153 }
154
155 #ifdef HAVE_READV
156 nn = readv(so->s, (struct iovec *)iov, n);
157 DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
158 #else
159 nn = recv(so->s, iov[0].iov_base, iov[0].iov_len,0);
160 #endif
161 if (nn <= 0) {
162 if (nn < 0 && (errno == EINTR || errno == EAGAIN))
163 return 0;
164 else {
165 DEBUG_MISC((dfd, " --- soread() disconnected, nn = %d, errno = %d-%s\n", nn, errno,strerror(errno)));
166 sofcantrcvmore(so);
167 tcp_sockclosed(sototcpcb(so));
168 return -1;
169 }
170 }
171
172 #ifndef HAVE_READV
173 /*
174 * If there was no error, try and read the second time round
175 * We read again if n = 2 (ie, there's another part of the buffer)
176 * and we read as much as we could in the first read
177 * We don't test for <= 0 this time, because there legitimately
178 * might not be any more data (since the socket is non-blocking),
179 * a close will be detected on next iteration.
180 * A return of -1 wont (shouldn't) happen, since it didn't happen above
181 */
182 if (n == 2 && nn == iov[0].iov_len) {
183 int ret;
184 ret = recv(so->s, iov[1].iov_base, iov[1].iov_len,0);
185 if (ret > 0)
186 nn += ret;
187 }
188
189 DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
190 #endif
191
192 /* Update fields */
193 sb->sb_cc += nn;
194 sb->sb_wptr += nn;
195 if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
196 sb->sb_wptr -= sb->sb_datalen;
197 return nn;
198 }
199
200 /*
201 * Get urgent data
202 *
203 * When the socket is created, we set it SO_OOBINLINE,
204 * so when OOB data arrives, we soread() it and everything
205 * in the send buffer is sent as urgent data
206 */
207 void
208 sorecvoob(so)
209 struct socket *so;
210 {
211 struct tcpcb *tp = sototcpcb(so);
212
213 DEBUG_CALL("sorecvoob");
214 DEBUG_ARG("so = %lx", (long)so);
215
216 /*
217 * We take a guess at how much urgent data has arrived.
218 * In most situations, when urgent data arrives, the next
219 * read() should get all the urgent data. This guess will
220 * be wrong however if more data arrives just after the
221 * urgent data, or the read() doesn't return all the
222 * urgent data.
223 */
224 soread(so);
225 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
226 tp->t_force = 1;
227 tcp_output(tp);
228 tp->t_force = 0;
229 }
230
231 /*
232 * Send urgent data
233 * There's a lot duplicated code here, but...
234 */
235 int
236 sosendoob(so)
237 struct socket *so;
238 {
239 struct sbuf *sb = &so->so_rcv;
240 char buff[2048]; /* XXX Shouldn't be sending more oob data than this */
241
242 int n, len;
243
244 DEBUG_CALL("sosendoob");
245 DEBUG_ARG("so = %lx", (long)so);
246 DEBUG_ARG("sb->sb_cc = %d", sb->sb_cc);
247
248 if (so->so_urgc > 2048)
249 so->so_urgc = 2048; /* XXXX */
250
251 if (sb->sb_rptr < sb->sb_wptr) {
252 /* We can send it directly */
253 n = send(so->s, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* |MSG_DONTWAIT)); */
254 so->so_urgc -= n;
255
256 DEBUG_MISC((dfd, " --- sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
257 } else {
258 /*
259 * Since there's no sendv or sendtov like writev,
260 * we must copy all data to a linear buffer then
261 * send it all
262 */
263 len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
264 if (len > so->so_urgc) len = so->so_urgc;
265 memcpy(buff, sb->sb_rptr, len);
266 so->so_urgc -= len;
267 if (so->so_urgc) {
268 n = sb->sb_wptr - sb->sb_data;
269 if (n > so->so_urgc) n = so->so_urgc;
270 memcpy((buff + len), sb->sb_data, n);
271 so->so_urgc -= n;
272 len += n;
273 }
274 n = send(so->s, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */
275 #ifdef DEBUG
276 if (n != len)
277 DEBUG_ERROR((dfd, "Didn't send all data urgently XXXXX\n"));
278 #endif
279 DEBUG_MISC((dfd, " ---2 sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
280 }
281
282 sb->sb_cc -= n;
283 sb->sb_rptr += n;
284 if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
285 sb->sb_rptr -= sb->sb_datalen;
286
287 return n;
288 }
289
290 /*
291 * Write data from so_rcv to so's socket,
292 * updating all sbuf field as necessary
293 */
294 int
295 sowrite(so)
296 struct socket *so;
297 {
298 int n,nn;
299 struct sbuf *sb = &so->so_rcv;
300 int len = sb->sb_cc;
301 struct iovec iov[2];
302
303 DEBUG_CALL("sowrite");
304 DEBUG_ARG("so = %lx", (long)so);
305
306 if (so->so_urgc) {
307 sosendoob(so);
308 if (sb->sb_cc == 0)
309 return 0;
310 }
311
312 /*
313 * No need to check if there's something to write,
314 * sowrite wouldn't have been called otherwise
315 */
316
317 len = sb->sb_cc;
318
319 iov[0].iov_base = sb->sb_rptr;
320 if (sb->sb_rptr < sb->sb_wptr) {
321 iov[0].iov_len = sb->sb_wptr - sb->sb_rptr;
322 /* Should never succeed, but... */
323 if (iov[0].iov_len > len) iov[0].iov_len = len;
324 n = 1;
325 } else {
326 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
327 if (iov[0].iov_len > len) iov[0].iov_len = len;
328 len -= iov[0].iov_len;
329 if (len) {
330 iov[1].iov_base = sb->sb_data;
331 iov[1].iov_len = sb->sb_wptr - sb->sb_data;
332 if (iov[1].iov_len > len) iov[1].iov_len = len;
333 n = 2;
334 } else
335 n = 1;
336 }
337 /* Check if there's urgent data to send, and if so, send it */
338
339 #ifdef HAVE_READV
340 nn = writev(so->s, (const struct iovec *)iov, n);
341
342 DEBUG_MISC((dfd, " ... wrote nn = %d bytes\n", nn));
343 #else
344 nn = send(so->s, iov[0].iov_base, iov[0].iov_len,0);
345 #endif
346 /* This should never happen, but people tell me it does *shrug* */
347 if (nn < 0 && (errno == EAGAIN || errno == EINTR))
348 return 0;
349
350 if (nn <= 0) {
351 DEBUG_MISC((dfd, " --- sowrite disconnected, so->so_state = %x, errno = %d\n",
352 so->so_state, errno));
353 sofcantsendmore(so);
354 tcp_sockclosed(sototcpcb(so));
355 return -1;
356 }
357
358 #ifndef HAVE_READV
359 if (n == 2 && nn == iov[0].iov_len) {
360 int ret;
361 ret = send(so->s, iov[1].iov_base, iov[1].iov_len,0);
362 if (ret > 0)
363 nn += ret;
364 }
365 DEBUG_MISC((dfd, " ... wrote nn = %d bytes\n", nn));
366 #endif
367
368 /* Update sbuf */
369 sb->sb_cc -= nn;
370 sb->sb_rptr += nn;
371 if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
372 sb->sb_rptr -= sb->sb_datalen;
373
374 /*
375 * If in DRAIN mode, and there's no more data, set
376 * it CANTSENDMORE
377 */
378 if ((so->so_state & SS_FWDRAIN) && sb->sb_cc == 0)
379 sofcantsendmore(so);
380
381 return nn;
382 }
383
384 /*
385 * recvfrom() a UDP socket
386 */
387 void
388 sorecvfrom(so)
389 struct socket *so;
390 {
391 struct sockaddr_in addr;
392 socklen_t addrlen = sizeof(struct sockaddr_in);
393
394 DEBUG_CALL("sorecvfrom");
395 DEBUG_ARG("so = %lx", (long)so);
396
397 if (so->so_type == IPPROTO_ICMP) { /* This is a "ping" reply */
398 char buff[256];
399 int len;
400
401 len = recvfrom(so->s, buff, 256, 0,
402 (struct sockaddr *)&addr, &addrlen);
403 /* XXX Check if reply is "correct"? */
404
405 if(len == -1 || len == 0) {
406 u_char code=ICMP_UNREACH_PORT;
407
408 if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
409 else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
410
411 DEBUG_MISC((dfd," udp icmp rx errno = %d-%s\n",
412 errno,strerror(errno)));
413 icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
414 } else {
415 icmp_reflect(so->so_m);
416 so->so_m = 0; /* Don't m_free() it again! */
417 }
418 /* No need for this socket anymore, udp_detach it */
419 udp_detach(so);
420 } else { /* A "normal" UDP packet */
421 struct mbuf *m;
422 int len;
423 ioctlsockopt_t n;
424
425 if (!(m = m_get())) return;
426 m->m_data += if_maxlinkhdr;
427
428 /*
429 * XXX Shouldn't FIONREAD packets destined for port 53,
430 * but I don't know the max packet size for DNS lookups
431 */
432 len = M_FREEROOM(m);
433 /* if (so->so_fport != htons(53)) { */
434 ioctlsocket(so->s, FIONREAD, &n);
435
436 if (n > len) {
437 n = (m->m_data - m->m_dat) + m->m_len + n + 1;
438 m_inc(m, n);
439 len = M_FREEROOM(m);
440 }
441 /* } */
442
443 m->m_len = recvfrom(so->s, m->m_data, len, 0,
444 (struct sockaddr *)&addr, &addrlen);
445 DEBUG_MISC((dfd, " did recvfrom %d, errno = %d-%s\n",
446 m->m_len, errno,strerror(errno)));
447 if(m->m_len<0) {
448 u_char code=ICMP_UNREACH_PORT;
449
450 if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
451 else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
452
453 DEBUG_MISC((dfd," rx error, tx icmp ICMP_UNREACH:%i\n", code));
454 icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
455 m_free(m);
456 } else {
457 /*
458 * Hack: domain name lookup will be used the most for UDP,
459 * and since they'll only be used once there's no need
460 * for the 4 minute (or whatever) timeout... So we time them
461 * out much quicker (10 seconds for now...)
462 */
463 if (so->so_expire) {
464 if (so->so_fport == htons(53))
465 so->so_expire = curtime + SO_EXPIREFAST;
466 else
467 so->so_expire = curtime + SO_EXPIRE;
468 }
469
470 /* if (m->m_len == len) {
471 * m_inc(m, MINCSIZE);
472 * m->m_len = 0;
473 * }
474 */
475
476 /*
477 * If this packet was destined for CTL_ADDR,
478 * make it look like that's where it came from, done by udp_output
479 */
480 udp_output(so, m, &addr);
481 } /* rx error */
482 } /* if ping packet */
483 }
484
485 /*
486 * sendto() a socket
487 */
488 int
489 sosendto(so, m)
490 struct socket *so;
491 struct mbuf *m;
492 {
493 int ret;
494 struct sockaddr_in addr;
495
496 DEBUG_CALL("sosendto");
497 DEBUG_ARG("so = %lx", (long)so);
498 DEBUG_ARG("m = %lx", (long)m);
499
500 addr.sin_family = AF_INET;
501 if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
502 /* It's an alias */
503 switch(ntohl(so->so_faddr.s_addr) & 0xff) {
504 case CTL_DNS:
505 addr.sin_addr = dns_addr;
506 break;
507 case CTL_ALIAS:
508 default:
509 addr.sin_addr = loopback_addr;
510 break;
511 }
512 } else
513 addr.sin_addr = so->so_faddr;
514 addr.sin_port = so->so_fport;
515
516 DEBUG_MISC((dfd, " sendto()ing, addr.sin_port=%d, addr.sin_addr.s_addr=%.16s\n", ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
517
518 /* Don't care what port we get */
519 ret = sendto(so->s, m->m_data, m->m_len, 0,
520 (struct sockaddr *)&addr, sizeof (struct sockaddr));
521 if (ret < 0)
522 return -1;
523
524 /*
525 * Kill the socket if there's no reply in 4 minutes,
526 * but only if it's an expirable socket
527 */
528 if (so->so_expire)
529 so->so_expire = curtime + SO_EXPIRE;
530 so->so_state = SS_ISFCONNECTED; /* So that it gets select()ed */
531 return 0;
532 }
533
534 /*
535 * XXX This should really be tcp_listen
536 */
537 struct socket *
538 solisten(port, laddr, lport, flags)
539 u_int port;
540 u_int32_t laddr;
541 u_int lport;
542 int flags;
543 {
544 struct sockaddr_in addr;
545 struct socket *so;
546 int s;
547 socklen_t addrlen = sizeof(addr);
548 int opt = 1;
549
550 DEBUG_CALL("solisten");
551 DEBUG_ARG("port = %d", port);
552 DEBUG_ARG("laddr = %x", laddr);
553 DEBUG_ARG("lport = %d", lport);
554 DEBUG_ARG("flags = %x", flags);
555
556 if ((so = socreate()) == NULL) {
557 /* free(so); Not sofree() ??? free(NULL) == NOP */
558 return NULL;
559 }
560
561 /* Don't tcp_attach... we don't need so_snd nor so_rcv */
562 if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL) {
563 free(so);
564 return NULL;
565 }
566 insque(so,&tcb);
567
568 /*
569 * SS_FACCEPTONCE sockets must time out.
570 */
571 if (flags & SS_FACCEPTONCE)
572 so->so_tcpcb->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT*2;
573
574 so->so_state = (SS_FACCEPTCONN|flags);
575 so->so_lport = lport; /* Kept in network format */
576 so->so_laddr.s_addr = laddr; /* Ditto */
577
578 addr.sin_family = AF_INET;
579 addr.sin_addr.s_addr = INADDR_ANY;
580 addr.sin_port = port;
581
582 if (((s = socket(AF_INET,SOCK_STREAM,0)) < 0) ||
583 (setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)) < 0) ||
584 (bind(s,(struct sockaddr *)&addr, sizeof(addr)) < 0) ||
585 (listen(s,1) < 0)) {
586 int tmperrno = errno; /* Don't clobber the real reason we failed */
587
588 close(s);
589 sofree(so);
590 /* Restore the real errno */
591 #ifdef _WIN32
592 WSASetLastError(tmperrno);
593 #else
594 errno = tmperrno;
595 #endif
596 return NULL;
597 }
598 setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
599
600 getsockname(s,(struct sockaddr *)&addr,&addrlen);
601 so->so_fport = addr.sin_port;
602 if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr)
603 so->so_faddr = alias_addr;
604 else
605 so->so_faddr = addr.sin_addr;
606
607 so->s = s;
608 return so;
609 }
610
611 /*
612 * Data is available in so_rcv
613 * Just write() the data to the socket
614 * XXX not yet...
615 */
616 void
617 sorwakeup(so)
618 struct socket *so;
619 {
620 /* sowrite(so); */
621 /* FD_CLR(so->s,&writefds); */
622 }
623
624 /*
625 * Data has been freed in so_snd
626 * We have room for a read() if we want to
627 * For now, don't read, it'll be done in the main loop
628 */
629 void
630 sowwakeup(so)
631 struct socket *so;
632 {
633 /* Nothing, yet */
634 }
635
636 /*
637 * Various session state calls
638 * XXX Should be #define's
639 * The socket state stuff needs work, these often get call 2 or 3
640 * times each when only 1 was needed
641 */
642 void
643 soisfconnecting(so)
644 register struct socket *so;
645 {
646 so->so_state &= ~(SS_NOFDREF|SS_ISFCONNECTED|SS_FCANTRCVMORE|
647 SS_FCANTSENDMORE|SS_FWDRAIN);
648 so->so_state |= SS_ISFCONNECTING; /* Clobber other states */
649 }
650
651 void
652 soisfconnected(so)
653 register struct socket *so;
654 {
655 so->so_state &= ~(SS_ISFCONNECTING|SS_FWDRAIN|SS_NOFDREF);
656 so->so_state |= SS_ISFCONNECTED; /* Clobber other states */
657 }
658
659 void
660 sofcantrcvmore(so)
661 struct socket *so;
662 {
663 if ((so->so_state & SS_NOFDREF) == 0) {
664 shutdown(so->s,0);
665 if(global_writefds) {
666 FD_CLR(so->s,global_writefds);
667 }
668 }
669 so->so_state &= ~(SS_ISFCONNECTING);
670 if (so->so_state & SS_FCANTSENDMORE)
671 so->so_state = SS_NOFDREF; /* Don't select it */ /* XXX close() here as well? */
672 else
673 so->so_state |= SS_FCANTRCVMORE;
674 }
675
676 void
677 sofcantsendmore(so)
678 struct socket *so;
679 {
680 if ((so->so_state & SS_NOFDREF) == 0) {
681 shutdown(so->s,1); /* send FIN to fhost */
682 if (global_readfds) {
683 FD_CLR(so->s,global_readfds);
684 }
685 if (global_xfds) {
686 FD_CLR(so->s,global_xfds);
687 }
688 }
689 so->so_state &= ~(SS_ISFCONNECTING);
690 if (so->so_state & SS_FCANTRCVMORE)
691 so->so_state = SS_NOFDREF; /* as above */
692 else
693 so->so_state |= SS_FCANTSENDMORE;
694 }
695
696 void
697 soisfdisconnected(so)
698 struct socket *so;
699 {
700 /* so->so_state &= ~(SS_ISFCONNECTING|SS_ISFCONNECTED); */
701 /* close(so->s); */
702 /* so->so_state = SS_ISFDISCONNECTED; */
703 /*
704 * XXX Do nothing ... ?
705 */
706 }
707
708 /*
709 * Set write drain mode
710 * Set CANTSENDMORE once all data has been write()n
711 */
712 void
713 sofwdrain(so)
714 struct socket *so;
715 {
716 if (so->so_rcv.sb_cc)
717 so->so_state |= SS_FWDRAIN;
718 else
719 sofcantsendmore(so);
720 }
721