2 * Copyright (c) 1995 Danny Gasparovski.
4 * Please read the file COPYRIGHT for the
5 * terms and conditions of the copyright.
8 #include "qemu-common.h"
12 #include <sys/filio.h>
15 static void sofcantrcvmore(struct socket *so);
16 static void sofcantsendmore(struct socket *so);
19 solookup(struct socket *head, struct in_addr laddr, u_int lport,
20 struct in_addr faddr, u_int fport)
24 for (so = head->so_next; so != head; so = so->so_next) {
25 if (so->so_lport == lport &&
26 so->so_laddr.s_addr == laddr.s_addr &&
27 so->so_faddr.s_addr == faddr.s_addr &&
28 so->so_fport == fport)
33 return (struct socket *)NULL;
39 * Create a new socket, initialise the fields
40 * It is the responsibility of the caller to
41 * insque() it into the correct linked-list
44 socreate(Slirp *slirp)
48 so = (struct socket *)malloc(sizeof(struct socket));
50 memset(so, 0, sizeof(struct socket));
51 so->so_state = SS_NOFDREF;
59 * remque and free a socket, clobber cache
62 sofree(struct socket *so)
64 Slirp *slirp = so->slirp;
66 if (so->so_emu==EMU_RSH && so->extra) {
70 if (so == slirp->tcp_last_so) {
71 slirp->tcp_last_so = &slirp->tcb;
72 } else if (so == slirp->udp_last_so) {
73 slirp->udp_last_so = &slirp->udb;
77 if(so->so_next && so->so_prev)
78 remque(so); /* crashes if so is not in a queue */
83 size_t sopreprbuf(struct socket *so, struct iovec *iov, int *np)
86 struct sbuf *sb = &so->so_snd;
87 int len = sb->sb_datalen - sb->sb_cc;
88 int mss = so->so_tcpcb->t_maxseg;
90 DEBUG_CALL("sopreprbuf");
91 DEBUG_ARG("so = %lx", (long )so);
93 len = sb->sb_datalen - sb->sb_cc;
98 iov[0].iov_base = sb->sb_wptr;
99 iov[1].iov_base = NULL;
101 if (sb->sb_wptr < sb->sb_rptr) {
102 iov[0].iov_len = sb->sb_rptr - sb->sb_wptr;
103 /* Should never succeed, but... */
104 if (iov[0].iov_len > len)
105 iov[0].iov_len = len;
106 if (iov[0].iov_len > mss)
107 iov[0].iov_len -= iov[0].iov_len%mss;
110 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_wptr;
111 /* Should never succeed, but... */
112 if (iov[0].iov_len > len) iov[0].iov_len = len;
113 len -= iov[0].iov_len;
115 iov[1].iov_base = sb->sb_data;
116 iov[1].iov_len = sb->sb_rptr - sb->sb_data;
117 if(iov[1].iov_len > len)
118 iov[1].iov_len = len;
119 total = iov[0].iov_len + iov[1].iov_len;
122 if (iov[1].iov_len > lss) {
123 iov[1].iov_len -= lss;
126 lss -= iov[1].iov_len;
127 iov[0].iov_len -= lss;
133 if (iov[0].iov_len > mss)
134 iov[0].iov_len -= iov[0].iov_len%mss;
141 return iov[0].iov_len + (n - 1) * iov[1].iov_len;
145 * Read from so's socket into sb_snd, updating all relevant sbuf fields
146 * NOTE: This will only be called if it is select()ed for reading, so
147 * a read() of 0 (or less) means it's disconnected
150 soread(struct socket *so)
153 struct sbuf *sb = &so->so_snd;
156 DEBUG_CALL("soread");
157 DEBUG_ARG("so = %lx", (long )so);
160 * No need to check if there's enough room to read.
161 * soread wouldn't have been called if there weren't
163 sopreprbuf(so, iov, &n);
166 nn = readv(so->s, (struct iovec *)iov, n);
167 DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
169 nn = recv(so->s, iov[0].iov_base, iov[0].iov_len,0);
172 if (nn < 0 && (errno == EINTR || errno == EAGAIN))
175 DEBUG_MISC((dfd, " --- soread() disconnected, nn = %d, errno = %d-%s\n", nn, errno,strerror(errno)));
177 tcp_sockclosed(sototcpcb(so));
184 * If there was no error, try and read the second time round
185 * We read again if n = 2 (ie, there's another part of the buffer)
186 * and we read as much as we could in the first read
187 * We don't test for <= 0 this time, because there legitimately
188 * might not be any more data (since the socket is non-blocking),
189 * a close will be detected on next iteration.
190 * A return of -1 wont (shouldn't) happen, since it didn't happen above
192 if (n == 2 && nn == iov[0].iov_len) {
194 ret = recv(so->s, iov[1].iov_base, iov[1].iov_len,0);
199 DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
205 if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
206 sb->sb_wptr -= sb->sb_datalen;
210 int soreadbuf(struct socket *so, const char *buf, int size)
212 int n, nn, copy = size;
213 struct sbuf *sb = &so->so_snd;
216 DEBUG_CALL("soreadbuf");
217 DEBUG_ARG("so = %lx", (long )so);
220 * No need to check if there's enough room to read.
221 * soread wouldn't have been called if there weren't
223 if (sopreprbuf(so, iov, &n) < size)
226 nn = MIN(iov[0].iov_len, copy);
227 memcpy(iov[0].iov_base, buf, nn);
235 memcpy(iov[1].iov_base, buf, copy);
241 if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
242 sb->sb_wptr -= sb->sb_datalen;
247 tcp_sockclosed(sototcpcb(so));
248 fprintf(stderr, "soreadbuf buffer to small");
255 * When the socket is created, we set it SO_OOBINLINE,
256 * so when OOB data arrives, we soread() it and everything
257 * in the send buffer is sent as urgent data
260 sorecvoob(struct socket *so)
262 struct tcpcb *tp = sototcpcb(so);
264 DEBUG_CALL("sorecvoob");
265 DEBUG_ARG("so = %lx", (long)so);
268 * We take a guess at how much urgent data has arrived.
269 * In most situations, when urgent data arrives, the next
270 * read() should get all the urgent data. This guess will
271 * be wrong however if more data arrives just after the
272 * urgent data, or the read() doesn't return all the
276 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
284 * There's a lot duplicated code here, but...
287 sosendoob(struct socket *so)
289 struct sbuf *sb = &so->so_rcv;
290 char buff[2048]; /* XXX Shouldn't be sending more oob data than this */
294 DEBUG_CALL("sosendoob");
295 DEBUG_ARG("so = %lx", (long)so);
296 DEBUG_ARG("sb->sb_cc = %d", sb->sb_cc);
298 if (so->so_urgc > 2048)
299 so->so_urgc = 2048; /* XXXX */
301 if (sb->sb_rptr < sb->sb_wptr) {
302 /* We can send it directly */
303 n = slirp_send(so, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* |MSG_DONTWAIT)); */
306 DEBUG_MISC((dfd, " --- sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
309 * Since there's no sendv or sendtov like writev,
310 * we must copy all data to a linear buffer then
313 len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
314 if (len > so->so_urgc) len = so->so_urgc;
315 memcpy(buff, sb->sb_rptr, len);
318 n = sb->sb_wptr - sb->sb_data;
319 if (n > so->so_urgc) n = so->so_urgc;
320 memcpy((buff + len), sb->sb_data, n);
324 n = slirp_send(so, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */
327 DEBUG_ERROR((dfd, "Didn't send all data urgently XXXXX\n"));
329 DEBUG_MISC((dfd, " ---2 sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
334 if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
335 sb->sb_rptr -= sb->sb_datalen;
341 * Write data from so_rcv to so's socket,
342 * updating all sbuf field as necessary
345 sowrite(struct socket *so)
348 struct sbuf *sb = &so->so_rcv;
352 DEBUG_CALL("sowrite");
353 DEBUG_ARG("so = %lx", (long)so);
362 * No need to check if there's something to write,
363 * sowrite wouldn't have been called otherwise
368 iov[0].iov_base = sb->sb_rptr;
369 iov[1].iov_base = NULL;
371 if (sb->sb_rptr < sb->sb_wptr) {
372 iov[0].iov_len = sb->sb_wptr - sb->sb_rptr;
373 /* Should never succeed, but... */
374 if (iov[0].iov_len > len) iov[0].iov_len = len;
377 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
378 if (iov[0].iov_len > len) iov[0].iov_len = len;
379 len -= iov[0].iov_len;
381 iov[1].iov_base = sb->sb_data;
382 iov[1].iov_len = sb->sb_wptr - sb->sb_data;
383 if (iov[1].iov_len > len) iov[1].iov_len = len;
388 /* Check if there's urgent data to send, and if so, send it */
391 nn = writev(so->s, (const struct iovec *)iov, n);
393 DEBUG_MISC((dfd, " ... wrote nn = %d bytes\n", nn));
395 nn = slirp_send(so, iov[0].iov_base, iov[0].iov_len,0);
397 /* This should never happen, but people tell me it does *shrug* */
398 if (nn < 0 && (errno == EAGAIN || errno == EINTR))
402 DEBUG_MISC((dfd, " --- sowrite disconnected, so->so_state = %x, errno = %d\n",
403 so->so_state, errno));
405 tcp_sockclosed(sototcpcb(so));
410 if (n == 2 && nn == iov[0].iov_len) {
412 ret = slirp_send(so, iov[1].iov_base, iov[1].iov_len,0);
416 DEBUG_MISC((dfd, " ... wrote nn = %d bytes\n", nn));
422 if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
423 sb->sb_rptr -= sb->sb_datalen;
426 * If in DRAIN mode, and there's no more data, set
429 if ((so->so_state & SS_FWDRAIN) && sb->sb_cc == 0)
436 * recvfrom() a UDP socket
439 sorecvfrom(struct socket *so)
441 struct sockaddr_in addr;
442 socklen_t addrlen = sizeof(struct sockaddr_in);
444 DEBUG_CALL("sorecvfrom");
445 DEBUG_ARG("so = %lx", (long)so);
447 if (so->so_type == IPPROTO_ICMP) { /* This is a "ping" reply */
451 len = recvfrom(so->s, buff, 256, 0,
452 (struct sockaddr *)&addr, &addrlen);
453 /* XXX Check if reply is "correct"? */
455 if(len == -1 || len == 0) {
456 u_char code=ICMP_UNREACH_PORT;
458 if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
459 else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
461 DEBUG_MISC((dfd," udp icmp rx errno = %d-%s\n",
462 errno,strerror(errno)));
463 icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
465 icmp_reflect(so->so_m);
466 so->so_m = NULL; /* Don't m_free() it again! */
468 /* No need for this socket anymore, udp_detach it */
470 } else { /* A "normal" UDP packet */
479 m = m_get(so->slirp);
483 m->m_data += IF_MAXLINKHDR;
486 * XXX Shouldn't FIONREAD packets destined for port 53,
487 * but I don't know the max packet size for DNS lookups
490 /* if (so->so_fport != htons(53)) { */
491 ioctlsocket(so->s, FIONREAD, &n);
494 n = (m->m_data - m->m_dat) + m->m_len + n + 1;
500 m->m_len = recvfrom(so->s, m->m_data, len, 0,
501 (struct sockaddr *)&addr, &addrlen);
502 DEBUG_MISC((dfd, " did recvfrom %d, errno = %d-%s\n",
503 m->m_len, errno,strerror(errno)));
505 u_char code=ICMP_UNREACH_PORT;
507 if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
508 else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
510 DEBUG_MISC((dfd," rx error, tx icmp ICMP_UNREACH:%i\n", code));
511 icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
515 * Hack: domain name lookup will be used the most for UDP,
516 * and since they'll only be used once there's no need
517 * for the 4 minute (or whatever) timeout... So we time them
518 * out much quicker (10 seconds for now...)
521 if (so->so_fport == htons(53))
522 so->so_expire = curtime + SO_EXPIREFAST;
524 so->so_expire = curtime + SO_EXPIRE;
528 * If this packet was destined for CTL_ADDR,
529 * make it look like that's where it came from, done by udp_output
531 udp_output(so, m, &addr);
533 } /* if ping packet */
540 sosendto(struct socket *so, struct mbuf *m)
542 Slirp *slirp = so->slirp;
544 struct sockaddr_in addr;
546 DEBUG_CALL("sosendto");
547 DEBUG_ARG("so = %lx", (long)so);
548 DEBUG_ARG("m = %lx", (long)m);
550 addr.sin_family = AF_INET;
551 if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
552 slirp->vnetwork_addr.s_addr) {
554 if (so->so_faddr.s_addr == slirp->vnameserver_addr.s_addr) {
555 addr.sin_addr = dns_addr;
557 addr.sin_addr = loopback_addr;
560 addr.sin_addr = so->so_faddr;
561 addr.sin_port = so->so_fport;
563 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)));
565 /* Don't care what port we get */
566 ret = sendto(so->s, m->m_data, m->m_len, 0,
567 (struct sockaddr *)&addr, sizeof (struct sockaddr));
572 * Kill the socket if there's no reply in 4 minutes,
573 * but only if it's an expirable socket
576 so->so_expire = curtime + SO_EXPIRE;
577 so->so_state &= SS_PERSISTENT_MASK;
578 so->so_state |= SS_ISFCONNECTED; /* So that it gets select()ed */
583 * Listen for incoming TCP connections
586 tcp_listen(Slirp *slirp, u_int32_t haddr, u_int hport, u_int32_t laddr,
587 u_int lport, int flags)
589 struct sockaddr_in addr;
592 socklen_t addrlen = sizeof(addr);
594 DEBUG_CALL("tcp_listen");
595 DEBUG_ARG("haddr = %x", haddr);
596 DEBUG_ARG("hport = %d", hport);
597 DEBUG_ARG("laddr = %x", laddr);
598 DEBUG_ARG("lport = %d", lport);
599 DEBUG_ARG("flags = %x", flags);
601 so = socreate(slirp);
606 /* Don't tcp_attach... we don't need so_snd nor so_rcv */
607 if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL) {
611 insque(so, &slirp->tcb);
614 * SS_FACCEPTONCE sockets must time out.
616 if (flags & SS_FACCEPTONCE)
617 so->so_tcpcb->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT*2;
619 so->so_state &= SS_PERSISTENT_MASK;
620 so->so_state |= (SS_FACCEPTCONN | flags);
621 so->so_lport = lport; /* Kept in network format */
622 so->so_laddr.s_addr = laddr; /* Ditto */
624 addr.sin_family = AF_INET;
625 addr.sin_addr.s_addr = haddr;
626 addr.sin_port = hport;
628 if (((s = socket(AF_INET,SOCK_STREAM,0)) < 0) ||
629 (setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)) < 0) ||
630 (bind(s,(struct sockaddr *)&addr, sizeof(addr)) < 0) ||
632 int tmperrno = errno; /* Don't clobber the real reason we failed */
636 /* Restore the real errno */
638 WSASetLastError(tmperrno);
644 setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
646 getsockname(s,(struct sockaddr *)&addr,&addrlen);
647 so->so_fport = addr.sin_port;
648 if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr)
649 so->so_faddr = slirp->vhost_addr;
651 so->so_faddr = addr.sin_addr;
658 * Various session state calls
659 * XXX Should be #define's
660 * The socket state stuff needs work, these often get call 2 or 3
661 * times each when only 1 was needed
664 soisfconnecting(struct socket *so)
666 so->so_state &= ~(SS_NOFDREF|SS_ISFCONNECTED|SS_FCANTRCVMORE|
667 SS_FCANTSENDMORE|SS_FWDRAIN);
668 so->so_state |= SS_ISFCONNECTING; /* Clobber other states */
672 soisfconnected(struct socket *so)
674 so->so_state &= ~(SS_ISFCONNECTING|SS_FWDRAIN|SS_NOFDREF);
675 so->so_state |= SS_ISFCONNECTED; /* Clobber other states */
679 sofcantrcvmore(struct socket *so)
681 if ((so->so_state & SS_NOFDREF) == 0) {
683 if(global_writefds) {
684 FD_CLR(so->s,global_writefds);
687 so->so_state &= ~(SS_ISFCONNECTING);
688 if (so->so_state & SS_FCANTSENDMORE) {
689 so->so_state &= SS_PERSISTENT_MASK;
690 so->so_state |= SS_NOFDREF; /* Don't select it */
692 so->so_state |= SS_FCANTRCVMORE;
697 sofcantsendmore(struct socket *so)
699 if ((so->so_state & SS_NOFDREF) == 0) {
700 shutdown(so->s,1); /* send FIN to fhost */
701 if (global_readfds) {
702 FD_CLR(so->s,global_readfds);
705 FD_CLR(so->s,global_xfds);
708 so->so_state &= ~(SS_ISFCONNECTING);
709 if (so->so_state & SS_FCANTRCVMORE) {
710 so->so_state &= SS_PERSISTENT_MASK;
711 so->so_state |= SS_NOFDREF; /* as above */
713 so->so_state |= SS_FCANTSENDMORE;
718 * Set write drain mode
719 * Set CANTSENDMORE once all data has been write()n
722 sofwdrain(struct socket *so)
724 if (so->so_rcv.sb_cc)
725 so->so_state |= SS_FWDRAIN;