2 * Copyright (c) 1995 Danny Gasparovski.
4 * Please read the file COPYRIGHT for the
5 * terms and conditions of the copyright.
8 #define WANT_SYS_IOCTL_H
12 #include <sys/filio.h>
15 static void sofcantrcvmore(struct socket *so);
16 static void sofcantsendmore(struct socket *so);
27 solookup(head, laddr, lport, faddr, fport)
36 for (so = head->so_next; so != head; so = so->so_next) {
37 if (so->so_lport == lport &&
38 so->so_laddr.s_addr == laddr.s_addr &&
39 so->so_faddr.s_addr == faddr.s_addr &&
40 so->so_fport == fport)
45 return (struct socket *)NULL;
51 * Create a new socket, initialise the fields
52 * It is the responsibility of the caller to
53 * insque() it into the correct linked-list
60 so = (struct socket *)malloc(sizeof(struct socket));
62 memset(so, 0, sizeof(struct socket));
63 so->so_state = SS_NOFDREF;
70 * remque and free a socket, clobber cache
76 if (so->so_emu==EMU_RSH && so->extra) {
80 if (so == tcp_last_so)
82 else if (so == udp_last_so)
87 if(so->so_next && so->so_prev)
88 remque(so); /* crashes if so is not in a queue */
94 * Read from so's socket into sb_snd, updating all relevant sbuf fields
95 * NOTE: This will only be called if it is select()ed for reading, so
96 * a read() of 0 (or less) means it's disconnected
102 int n, nn, lss, total;
103 struct sbuf *sb = &so->so_snd;
104 int len = sb->sb_datalen - sb->sb_cc;
106 int mss = so->so_tcpcb->t_maxseg;
108 DEBUG_CALL("soread");
109 DEBUG_ARG("so = %lx", (long )so);
112 * No need to check if there's enough room to read.
113 * soread wouldn't have been called if there weren't
116 len = sb->sb_datalen - sb->sb_cc;
118 iov[0].iov_base = sb->sb_wptr;
119 if (sb->sb_wptr < sb->sb_rptr) {
120 iov[0].iov_len = sb->sb_rptr - sb->sb_wptr;
121 /* Should never succeed, but... */
122 if (iov[0].iov_len > len)
123 iov[0].iov_len = len;
124 if (iov[0].iov_len > mss)
125 iov[0].iov_len -= iov[0].iov_len%mss;
128 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_wptr;
129 /* Should never succeed, but... */
130 if (iov[0].iov_len > len) iov[0].iov_len = len;
131 len -= iov[0].iov_len;
133 iov[1].iov_base = sb->sb_data;
134 iov[1].iov_len = sb->sb_rptr - sb->sb_data;
135 if(iov[1].iov_len > len)
136 iov[1].iov_len = len;
137 total = iov[0].iov_len + iov[1].iov_len;
140 if (iov[1].iov_len > lss) {
141 iov[1].iov_len -= lss;
144 lss -= iov[1].iov_len;
145 iov[0].iov_len -= lss;
151 if (iov[0].iov_len > mss)
152 iov[0].iov_len -= iov[0].iov_len%mss;
158 nn = readv(so->s, (struct iovec *)iov, n);
159 DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
161 nn = recv(so->s, iov[0].iov_base, iov[0].iov_len,0);
164 if (nn < 0 && (errno == EINTR || errno == EAGAIN))
167 DEBUG_MISC((dfd, " --- soread() disconnected, nn = %d, errno = %d-%s\n", nn, errno,strerror(errno)));
169 tcp_sockclosed(sototcpcb(so));
176 * If there was no error, try and read the second time round
177 * We read again if n = 2 (ie, there's another part of the buffer)
178 * and we read as much as we could in the first read
179 * We don't test for <= 0 this time, because there legitimately
180 * might not be any more data (since the socket is non-blocking),
181 * a close will be detected on next iteration.
182 * A return of -1 wont (shouldn't) happen, since it didn't happen above
184 if (n == 2 && nn == iov[0].iov_len) {
186 ret = recv(so->s, iov[1].iov_base, iov[1].iov_len,0);
191 DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
197 if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
198 sb->sb_wptr -= sb->sb_datalen;
205 * When the socket is created, we set it SO_OOBINLINE,
206 * so when OOB data arrives, we soread() it and everything
207 * in the send buffer is sent as urgent data
213 struct tcpcb *tp = sototcpcb(so);
215 DEBUG_CALL("sorecvoob");
216 DEBUG_ARG("so = %lx", (long)so);
219 * We take a guess at how much urgent data has arrived.
220 * In most situations, when urgent data arrives, the next
221 * read() should get all the urgent data. This guess will
222 * be wrong however if more data arrives just after the
223 * urgent data, or the read() doesn't return all the
227 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
235 * There's a lot duplicated code here, but...
241 struct sbuf *sb = &so->so_rcv;
242 char buff[2048]; /* XXX Shouldn't be sending more oob data than this */
246 DEBUG_CALL("sosendoob");
247 DEBUG_ARG("so = %lx", (long)so);
248 DEBUG_ARG("sb->sb_cc = %d", sb->sb_cc);
250 if (so->so_urgc > 2048)
251 so->so_urgc = 2048; /* XXXX */
253 if (sb->sb_rptr < sb->sb_wptr) {
254 /* We can send it directly */
255 n = send(so->s, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* |MSG_DONTWAIT)); */
258 DEBUG_MISC((dfd, " --- sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
261 * Since there's no sendv or sendtov like writev,
262 * we must copy all data to a linear buffer then
265 len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
266 if (len > so->so_urgc) len = so->so_urgc;
267 memcpy(buff, sb->sb_rptr, len);
270 n = sb->sb_wptr - sb->sb_data;
271 if (n > so->so_urgc) n = so->so_urgc;
272 memcpy((buff + len), sb->sb_data, n);
276 n = send(so->s, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */
279 DEBUG_ERROR((dfd, "Didn't send all data urgently XXXXX\n"));
281 DEBUG_MISC((dfd, " ---2 sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
286 if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
287 sb->sb_rptr -= sb->sb_datalen;
293 * Write data from so_rcv to so's socket,
294 * updating all sbuf field as necessary
301 struct sbuf *sb = &so->so_rcv;
305 DEBUG_CALL("sowrite");
306 DEBUG_ARG("so = %lx", (long)so);
315 * No need to check if there's something to write,
316 * sowrite wouldn't have been called otherwise
321 iov[0].iov_base = sb->sb_rptr;
322 if (sb->sb_rptr < sb->sb_wptr) {
323 iov[0].iov_len = sb->sb_wptr - sb->sb_rptr;
324 /* Should never succeed, but... */
325 if (iov[0].iov_len > len) iov[0].iov_len = len;
328 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
329 if (iov[0].iov_len > len) iov[0].iov_len = len;
330 len -= iov[0].iov_len;
332 iov[1].iov_base = sb->sb_data;
333 iov[1].iov_len = sb->sb_wptr - sb->sb_data;
334 if (iov[1].iov_len > len) iov[1].iov_len = len;
339 /* Check if there's urgent data to send, and if so, send it */
342 nn = writev(so->s, (const struct iovec *)iov, n);
344 DEBUG_MISC((dfd, " ... wrote nn = %d bytes\n", nn));
346 nn = send(so->s, iov[0].iov_base, iov[0].iov_len,0);
348 /* This should never happen, but people tell me it does *shrug* */
349 if (nn < 0 && (errno == EAGAIN || errno == EINTR))
353 DEBUG_MISC((dfd, " --- sowrite disconnected, so->so_state = %x, errno = %d\n",
354 so->so_state, errno));
356 tcp_sockclosed(sototcpcb(so));
361 if (n == 2 && nn == iov[0].iov_len) {
363 ret = send(so->s, iov[1].iov_base, iov[1].iov_len,0);
367 DEBUG_MISC((dfd, " ... wrote nn = %d bytes\n", nn));
373 if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
374 sb->sb_rptr -= sb->sb_datalen;
377 * If in DRAIN mode, and there's no more data, set
380 if ((so->so_state & SS_FWDRAIN) && sb->sb_cc == 0)
387 * recvfrom() a UDP socket
393 struct sockaddr_in addr;
394 socklen_t addrlen = sizeof(struct sockaddr_in);
396 DEBUG_CALL("sorecvfrom");
397 DEBUG_ARG("so = %lx", (long)so);
399 if (so->so_type == IPPROTO_ICMP) { /* This is a "ping" reply */
403 len = recvfrom(so->s, buff, 256, 0,
404 (struct sockaddr *)&addr, &addrlen);
405 /* XXX Check if reply is "correct"? */
407 if(len == -1 || len == 0) {
408 u_char code=ICMP_UNREACH_PORT;
410 if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
411 else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
413 DEBUG_MISC((dfd," udp icmp rx errno = %d-%s\n",
414 errno,strerror(errno)));
415 icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
417 icmp_reflect(so->so_m);
418 so->so_m = 0; /* Don't m_free() it again! */
420 /* No need for this socket anymore, udp_detach it */
422 } else { /* A "normal" UDP packet */
426 if (!(m = m_get())) return;
427 m->m_data += IF_MAXLINKHDR;
430 * XXX Shouldn't FIONREAD packets destined for port 53,
431 * but I don't know the max packet size for DNS lookups
434 /* if (so->so_fport != htons(53)) { */
435 ioctlsocket(so->s, FIONREAD, &n);
438 n = (m->m_data - m->m_dat) + m->m_len + n + 1;
444 m->m_len = recvfrom(so->s, m->m_data, len, 0,
445 (struct sockaddr *)&addr, &addrlen);
446 DEBUG_MISC((dfd, " did recvfrom %d, errno = %d-%s\n",
447 m->m_len, errno,strerror(errno)));
449 u_char code=ICMP_UNREACH_PORT;
451 if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
452 else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
454 DEBUG_MISC((dfd," rx error, tx icmp ICMP_UNREACH:%i\n", code));
455 icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
459 * Hack: domain name lookup will be used the most for UDP,
460 * and since they'll only be used once there's no need
461 * for the 4 minute (or whatever) timeout... So we time them
462 * out much quicker (10 seconds for now...)
465 if (so->so_fport == htons(53))
466 so->so_expire = curtime + SO_EXPIREFAST;
468 so->so_expire = curtime + SO_EXPIRE;
471 /* if (m->m_len == len) {
472 * m_inc(m, MINCSIZE);
478 * If this packet was destined for CTL_ADDR,
479 * make it look like that's where it came from, done by udp_output
481 udp_output(so, m, &addr);
483 } /* if ping packet */
495 struct sockaddr_in addr;
497 DEBUG_CALL("sosendto");
498 DEBUG_ARG("so = %lx", (long)so);
499 DEBUG_ARG("m = %lx", (long)m);
501 addr.sin_family = AF_INET;
502 if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
504 switch(ntohl(so->so_faddr.s_addr) & 0xff) {
506 addr.sin_addr = dns_addr;
510 addr.sin_addr = loopback_addr;
514 addr.sin_addr = so->so_faddr;
515 addr.sin_port = so->so_fport;
517 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)));
519 /* Don't care what port we get */
520 ret = sendto(so->s, m->m_data, m->m_len, 0,
521 (struct sockaddr *)&addr, sizeof (struct sockaddr));
526 * Kill the socket if there's no reply in 4 minutes,
527 * but only if it's an expirable socket
530 so->so_expire = curtime + SO_EXPIRE;
531 so->so_state = SS_ISFCONNECTED; /* So that it gets select()ed */
536 * XXX This should really be tcp_listen
539 solisten(port, laddr, lport, flags)
545 struct sockaddr_in addr;
548 socklen_t addrlen = sizeof(addr);
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);
556 if ((so = socreate()) == NULL) {
557 /* free(so); Not sofree() ??? free(NULL) == NOP */
561 /* Don't tcp_attach... we don't need so_snd nor so_rcv */
562 if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL) {
569 * SS_FACCEPTONCE sockets must time out.
571 if (flags & SS_FACCEPTONCE)
572 so->so_tcpcb->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT*2;
574 so->so_state = (SS_FACCEPTCONN|flags);
575 so->so_lport = lport; /* Kept in network format */
576 so->so_laddr.s_addr = laddr; /* Ditto */
578 addr.sin_family = AF_INET;
579 addr.sin_addr.s_addr = INADDR_ANY;
580 addr.sin_port = port;
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) ||
586 int tmperrno = errno; /* Don't clobber the real reason we failed */
590 /* Restore the real errno */
592 WSASetLastError(tmperrno);
598 setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
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;
605 so->so_faddr = addr.sin_addr;
613 * Data is available in so_rcv
614 * Just write() the data to the socket
622 /* FD_CLR(so->s,&writefds); */
626 * Data has been freed in so_snd
627 * We have room for a read() if we want to
628 * For now, don't read, it'll be done in the main loop
639 * Various session state calls
640 * XXX Should be #define's
641 * The socket state stuff needs work, these often get call 2 or 3
642 * times each when only 1 was needed
646 register struct socket *so;
648 so->so_state &= ~(SS_NOFDREF|SS_ISFCONNECTED|SS_FCANTRCVMORE|
649 SS_FCANTSENDMORE|SS_FWDRAIN);
650 so->so_state |= SS_ISFCONNECTING; /* Clobber other states */
655 register struct socket *so;
657 so->so_state &= ~(SS_ISFCONNECTING|SS_FWDRAIN|SS_NOFDREF);
658 so->so_state |= SS_ISFCONNECTED; /* Clobber other states */
662 sofcantrcvmore(struct socket *so)
664 if ((so->so_state & SS_NOFDREF) == 0) {
666 if(global_writefds) {
667 FD_CLR(so->s,global_writefds);
670 so->so_state &= ~(SS_ISFCONNECTING);
671 if (so->so_state & SS_FCANTSENDMORE)
672 so->so_state = SS_NOFDREF; /* Don't select it */ /* XXX close() here as well? */
674 so->so_state |= SS_FCANTRCVMORE;
678 sofcantsendmore(struct socket *so)
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);
686 FD_CLR(so->s,global_xfds);
689 so->so_state &= ~(SS_ISFCONNECTING);
690 if (so->so_state & SS_FCANTRCVMORE)
691 so->so_state = SS_NOFDREF; /* as above */
693 so->so_state |= SS_FCANTSENDMORE;
697 soisfdisconnected(so)
700 /* so->so_state &= ~(SS_ISFCONNECTING|SS_ISFCONNECTED); */
702 /* so->so_state = SS_ISFDISCONNECTED; */
704 * XXX Do nothing ... ?
709 * Set write drain mode
710 * Set CANTSENDMORE once all data has been write()n
716 if (so->so_rcv.sb_cc)
717 so->so_state |= SS_FWDRAIN;