slirp/socket.c

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