vde-2/src/slirpvde/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 <config.h>
  10 #include <vde.h>
  11 #include <vdecommon.h>
  12
  13 #include "slirp.h"
  14 #include "ip_icmp.h"
  15 #include "main.h"
  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 = read(so->s, iov[0].iov_base, iov[0].iov_len);
 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            nn += read(so->s, iov[1].iov_base, iov[1].iov_len);
 184
 185         DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
 186 #endif
 187
 188         /* Update fields */
 189         sb->sb_cc += nn;
 190         sb->sb_wptr += nn;
 191         if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
 192                 sb->sb_wptr -= sb->sb_datalen;
 193         return nn;
 194 }
 195
 196 /*
 197  * Get urgent data
 198  *
 199  * When the socket is created, we set it SO_OOBINLINE,
 200  * so when OOB data arrives, we soread() it and everything
 201  * in the send buffer is sent as urgent data
 202  */
 203 void
 204 sorecvoob(so)
 205         struct socket *so;
 206 {
 207         struct tcpcb *tp = sototcpcb(so);
 208
 209         DEBUG_CALL("sorecvoob");
 210         DEBUG_ARG("so = %lx", (long)so);
 211
 212         /*
 213          * We take a guess at how much urgent data has arrived.
 214          * In most situations, when urgent data arrives, the next
 215          * read() should get all the urgent data.  This guess will
 216          * be wrong however if more data arrives just after the
 217          * urgent data, or the read() doesn't return all the
 218          * urgent data.
 219          */
 220         soread(so);
 221         tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
 222         tp->t_force = 1;
 223         tcp_output(tp);
 224         tp->t_force = 0;
 225 }
 226
 227 /*
 228  * Send urgent data
 229  * There's a lot duplicated code here, but...
 230  */
 231 int
 232 sosendoob(so)
 233         struct socket *so;
 234 {
 235         struct sbuf *sb = &so->so_rcv;
 236         char buff[2048]; /* XXX Shouldn't be sending more oob data than this */
 237
 238         int n, len;
 239
 240         DEBUG_CALL("sosendoob");
 241         DEBUG_ARG("so = %lx", (long)so);
 242         DEBUG_ARG("sb->sb_cc = %d", sb->sb_cc);
 243
 244         if (so->so_urgc > 2048)
 245            so->so_urgc = 2048; /* XXXX */
 246
 247         if (sb->sb_rptr < sb->sb_wptr) {
 248                 /* We can send it directly */
 249                 n = send(so->s, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* |MSG_DONTWAIT)); */
 250                 so->so_urgc -= n;
 251
 252                 DEBUG_MISC((dfd, " --- sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
 253         } else {
 254                 /*
 255                  * Since there's no sendv or sendtov like writev,
 256                  * we must copy all data to a linear buffer then
 257                  * send it all
 258                  */
 259                 len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
 260                 if (len > so->so_urgc) len = so->so_urgc;
 261                 memcpy(buff, sb->sb_rptr, len);
 262                 so->so_urgc -= len;
 263                 if (so->so_urgc) {
 264                         n = sb->sb_wptr - sb->sb_data;
 265                         if (n > so->so_urgc) n = so->so_urgc;
 266                         memcpy((buff + len), sb->sb_data, n);
 267                         so->so_urgc -= n;
 268                         len += n;
 269                 }
 270                 n = send(so->s, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */
 271 #ifdef DEBUG
 272                 if (n != len)
 273                    DEBUG_ERROR((dfd, "Didn't send all data urgently XXXXX\n"));
 274 #endif
 275                 DEBUG_MISC((dfd, " ---2 sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
 276         }
 277
 278         sb->sb_cc -= n;
 279         sb->sb_rptr += n;
 280         if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
 281                 sb->sb_rptr -= sb->sb_datalen;
 282
 283         return n;
 284 }
 285
 286 /*
 287  * Write data from so_rcv to so's socket,
 288  * updating all sbuf field as necessary
 289  */
 290 int
 291 sowrite(so)
 292         struct socket *so;
 293 {
 294         int  n,nn;
 295         struct sbuf *sb = &so->so_rcv;
 296         int len = sb->sb_cc;
 297         struct iovec iov[2];
 298
 299         DEBUG_CALL("sowrite");
 300         DEBUG_ARG("so = %lx", (long)so);
 301
 302         if (so->so_urgc) {
 303                 sosendoob(so);
 304                 if (sb->sb_cc == 0)
 305                         return 0;
 306         }
 307
 308         /*
 309          * No need to check if there's something to write,
 310          * sowrite wouldn't have been called otherwise
 311          */
 312
 313         len = sb->sb_cc;
 314
 315         iov[0].iov_base = sb->sb_rptr;
 316         if (sb->sb_rptr < sb->sb_wptr) {
 317                 iov[0].iov_len = sb->sb_wptr - sb->sb_rptr;
 318                 /* Should never succeed, but... */
 319                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 320                 n = 1;
 321         } else {
 322                 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
 323                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 324                 len -= iov[0].iov_len;
 325                 if (len) {
 326                         iov[1].iov_base = sb->sb_data;
 327                         iov[1].iov_len = sb->sb_wptr - sb->sb_data;
 328                         if (iov[1].iov_len > len) iov[1].iov_len = len;
 329                         n = 2;
 330                 } else
 331                         n = 1;
 332         }
 333         /* Check if there's urgent data to send, and if so, send it */
 334
 335 #ifdef HAVE_READV
 336         nn = writev(so->s, (const struct iovec *)iov, n);
 337
 338         DEBUG_MISC((dfd, "  ... wrote nn = %d bytes\n", nn));
 339 #else
 340         nn = write(so->s, iov[0].iov_base, iov[0].iov_len);
 341 #endif
 342         /* This should never happen, but people tell me it does *shrug* */
 343         if (nn < 0 && (errno == EAGAIN || errno == EINTR))
 344                 return 0;
 345
 346         if (nn <= 0) {
 347                 DEBUG_MISC((dfd, " --- sowrite disconnected, so->so_state = %x, errno = %d\n",
 348                         so->so_state, errno));
 349                 sofcantsendmore(so);
 350                 tcp_sockclosed(sototcpcb(so));
 351                 return -1;
 352         }
 353
 354 #ifndef HAVE_READV
 355         if (n == 2 && nn == iov[0].iov_len)
 356            nn += write(so->s, iov[1].iov_base, iov[1].iov_len);
 357         DEBUG_MISC((dfd, "  ... wrote nn = %d bytes\n", nn));
 358 #endif
 359
 360         /* Update sbuf */
 361         sb->sb_cc -= nn;
 362         sb->sb_rptr += nn;
 363         if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
 364                 sb->sb_rptr -= sb->sb_datalen;
 365
 366         /*
 367          * If in DRAIN mode, and there's no more data, set
 368          * it CANTSENDMORE
 369          */
 370         if ((so->so_state & SS_FWDRAIN) && sb->sb_cc == 0)
 371                 sofcantsendmore(so);
 372
 373         return nn;
 374 }
 375
 376 /*
 377  * recvfrom() a UDP socket
 378  */
 379 void
 380 sorecvfrom(so)
 381         struct socket *so;
 382 {
 383         struct sockaddr_in addr;
 384         socklen_t addrlen = sizeof(struct sockaddr_in);
 385
 386         DEBUG_CALL("sorecvfrom");
 387         DEBUG_ARG("so = %lx", (long)so);
 388
 389         if (so->so_type == IPPROTO_ICMP) {   /* This is a "ping" reply */
 390           char buff[256];
 391           int len;
 392
 393           len = recvfrom(so->s, buff, 256, 0,
 394                          (struct sockaddr *)&addr, &addrlen);
 395           /* XXX Check if reply is "correct"? */
 396
 397           if(len == -1 || len == 0) {
 398             u_char code=ICMP_UNREACH_PORT;
 399
 400             if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
 401             else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
 402
 403             DEBUG_MISC((dfd," udp icmp rx errno = %d-%s\n",
 404                         errno,strerror(errno)));
 405             icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
 406           } else {
 407             icmp_reflect(so->so_m);
 408             so->so_m = 0; /* Don't m_free() it again! */
 409           }
 410           /* No need for this socket anymore, udp_detach it */
 411           udp_detach(so);
 412         } else {                                /* A "normal" UDP packet */
 413           struct mbuf *m;
 414           int len, n;
 415
 416           if (!(m = m_get())) return;
 417           m->m_data += if_maxlinkhdr;
 418
 419           /*
 420            * XXX Shouldn't FIONREAD packets destined for port 53,
 421            * but I don't know the max packet size for DNS lookups
 422            */
 423           len = M_FREEROOM(m);
 424           /* if (so->so_fport != htons(53)) { */
 425           ioctl(so->s, FIONREAD, &n);
 426
 427           if (n > len) {
 428             n = (m->m_data - m->m_dat) + m->m_len + n + 1;
 429             m_inc(m, n);
 430             len = M_FREEROOM(m);
 431           }
 432           /* } */
 433
 434           m->m_len = recvfrom(so->s, m->m_data, len, 0,
 435                               (struct sockaddr *)&addr, &addrlen);
 436           DEBUG_MISC((dfd, " did recvfrom %d, errno = %d-%s\n",
 437                       m->m_len, errno,strerror(errno)));
 438           if(m->m_len<0) {
 439             u_char code=ICMP_UNREACH_PORT;
 440
 441             if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
 442             else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
 443
 444             DEBUG_MISC((dfd," rx error, tx icmp ICMP_UNREACH:%i\n", code));
 445             icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
 446             m_free(m);
 447           } else {
 448           /*
 449            * Hack: domain name lookup will be used the most for UDP,
 450            * and since they'll only be used once there's no need
 451            * for the 4 minute (or whatever) timeout... So we time them
 452            * out much quicker (10 seconds  for now...)
 453            */
 454             if (so->so_expire) {
 455               if (so->so_fport == htons(53))
 456                 so->so_expire = curtime + SO_EXPIREFAST;
 457               else
 458                 so->so_expire = curtime + SO_EXPIRE;
 459             }
 460
 461             /*          if (m->m_len == len) {
 462              *                  m_inc(m, MINCSIZE);
 463              *                  m->m_len = 0;
 464              *          }
 465              */
 466
 467             /*
 468              * If this packet was destined for CTL_ADDR,
 469              * make it look like that's where it came from, done by udp_output
 470              */
 471             udp_output(so, m, &addr);
 472           } /* rx error */
 473         } /* if ping packet */
 474 }
 475
 476 /*
 477  * sendto() a socket
 478  */
 479 int
 480 sosendto(so, m)
 481         struct socket *so;
 482         struct mbuf *m;
 483 {
 484         int ret;
 485         struct sockaddr_in addr;
 486
 487         DEBUG_CALL("sosendto");
 488         DEBUG_ARG("so = %lx", (long)so);
 489         DEBUG_ARG("m = %lx", (long)m);
 490
 491         addr.sin_family = AF_INET;
 492         if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
 493           /* It's an alias */
 494           switch(ntohl(so->so_faddr.s_addr) & 0xff) {
 495           case CTL_DNS:
 496             addr.sin_addr = dns_addr;
 497             break;
 498           case CTL_ALIAS:
 499           default:
 500             addr.sin_addr = loopback_addr;
 501             break;
 502           }
 503         } else
 504           addr.sin_addr = so->so_faddr;
 505         addr.sin_port = so->so_fport;
 506
 507         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)));
 508
 509         /* Don't care what port we get */
 510         ret = sendto(so->s, m->m_data, m->m_len, 0,
 511                      (struct sockaddr *)&addr, sizeof (struct sockaddr));
 512         if (ret < 0)
 513                 return -1;
 514
 515         /*
 516          * Kill the socket if there's no reply in 4 minutes,
 517          * but only if it's an expirable socket
 518          */
 519         if (so->so_expire)
 520                 so->so_expire = curtime + SO_EXPIRE;
 521         so->so_state = SS_ISFCONNECTED; /* So that it gets select()ed */
 522         return 0;
 523 }
 524
 525 /*
 526  * XXX This should really be tcp_listen
 527  */
 528 struct socket *
 529 solisten(port, laddr, lport, flags)
 530         u_int port;
 531         u_int32_t laddr;
 532         u_int lport;
 533         int flags;
 534 {
 535         struct sockaddr_in addr;
 536         struct socket *so;
 537         int s;
 538         socklen_t addrlen = sizeof(addr), opt = 1;
 539
 540         DEBUG_CALL("solisten");
 541         DEBUG_ARG("port = %d", port);
 542         DEBUG_ARG("laddr = %x", laddr);
 543         DEBUG_ARG("lport = %d", lport);
 544         DEBUG_ARG("flags = %x", flags);
 545
 546         if ((so = socreate()) == NULL) {
 547           /* free(so);      Not sofree() ??? free(NULL) == NOP */
 548           return NULL;
 549         }
 550
 551         /* Don't tcp_attach... we don't need so_snd nor so_rcv */
 552         if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL) {
 553                 free(so);
 554                 return NULL;
 555         }
 556         insque(so,&tcb);
 557
 558         /*
 559          * SS_FACCEPTONCE sockets must time out.
 560          */
 561         if (flags & SS_FACCEPTONCE)
 562            so->so_tcpcb->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT*2;
 563
 564         so->so_state = (SS_FACCEPTCONN|flags);
 565         so->so_lport = lport; /* Kept in network format */
 566         so->so_laddr.s_addr = laddr; /* Ditto */
 567
 568         addr.sin_family = AF_INET;
 569         addr.sin_addr.s_addr = INADDR_ANY;
 570         addr.sin_port = port;
 571
 572         if (((s = socket(AF_INET,SOCK_STREAM,0)) < 0) ||
 573             (bind(s,(struct sockaddr *)&addr, sizeof(addr)) < 0) ||
 574             (listen(s,1) < 0)) {
 575                 int tmperrno = errno; /* Don't clobber the real reason we failed */
 576
 577                 close(s);
 578                 sofree(so);
 579                 /* Restore the real errno */
 580                 errno = tmperrno;
 581                 return NULL;
 582         }
 583         setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
 584         setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
 585
 586         getsockname(s,(struct sockaddr *)&addr,&addrlen);
 587         so->so_fport = addr.sin_port;
 588         if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr)
 589            so->so_faddr = our_addr;
 590         else
 591            so->so_faddr = addr.sin_addr;
 592
 593         so->s = s;
 594         return so;
 595 }
 596
 597 /*
 598  * Data is available in so_rcv
 599  * Just write() the data to the socket
 600  * XXX not yet...
 601  */
 602 void
 603 sorwakeup(so)
 604         struct socket *so;
 605 {
 606 /*      sowrite(so); */
 607 /*      FD_CLR(so->s,&writefds); */
 608 }
 609
 610 /*
 611  * Data has been freed in so_snd
 612  * We have room for a read() if we want to
 613  * For now, don't read, it'll be done in the main loop
 614  */
 615 void
 616 sowwakeup(so)
 617         struct socket *so;
 618 {
 619         /* Nothing, yet */
 620 }
 621
 622 /*
 623  * Various session state calls
 624  * XXX Should be #define's
 625  * The socket state stuff needs work, these often get call 2 or 3
 626  * times each when only 1 was needed
 627  */
 628 void
 629 soisfconnecting(so)
 630         register struct socket *so;
 631 {
 632         so->so_state &= ~(SS_NOFDREF|SS_ISFCONNECTED|SS_FCANTRCVMORE|
 633                           SS_FCANTSENDMORE|SS_FWDRAIN);
 634         so->so_state |= SS_ISFCONNECTING; /* Clobber other states */
 635 }
 636
 637 void
 638 soisfconnected(so)
 639         register struct socket *so;
 640 {
 641         so->so_state &= ~(SS_ISFCONNECTING|SS_FWDRAIN|SS_NOFDREF);
 642         so->so_state |= SS_ISFCONNECTED; /* Clobber other states */
 643 }
 644
 645 void
 646 sofcantrcvmore(so)
 647         struct  socket *so;
 648 {
 649         if ((so->so_state & SS_NOFDREF) == 0) {
 650                 shutdown(so->s,0);
 651                 if (global_writefds != NULL)
 652                         FD_CLR(so->s, global_writefds);
 653         }
 654         so->so_state &= ~(SS_ISFCONNECTING);
 655         if (so->so_state & SS_FCANTSENDMORE)
 656            so->so_state = SS_NOFDREF; /* Don't select it */ /* XXX close() here as well? */
 657         else
 658            so->so_state |= SS_FCANTRCVMORE;
 659 }
 660
 661 void
 662 sofcantsendmore(so)
 663         struct socket *so;
 664 {
 665         if ((so->so_state & SS_NOFDREF) == 0) {
 666                 shutdown(so->s,1);           /* send FIN to fhost */
 667                 if (global_readfds != NULL)
 668                         FD_CLR(so->s, global_readfds);
 669                 if (global_xfds != NULL)
 670                         FD_CLR(so->s, global_xfds);
 671         }
 672
 673         so->so_state &= ~(SS_ISFCONNECTING);
 674         if (so->so_state & SS_FCANTRCVMORE)
 675            so->so_state = SS_NOFDREF; /* as above */
 676         else
 677            so->so_state |= SS_FCANTSENDMORE;
 678 }
 679
 680 void
 681 soisfdisconnected(so)
 682         struct socket *so;
 683 {
 684 /*      so->so_state &= ~(SS_ISFCONNECTING|SS_ISFCONNECTED); */
 685 /*      close(so->s); */
 686 /*      so->so_state = SS_ISFDISCONNECTED; */
 687         /*
 688          * XXX Do nothing ... ?
 689          */
 690 }
 691
 692 /*
 693  * Set write drain mode
 694  * Set CANTSENDMORE once all data has been write()n
 695  */
 696 void
 697 sofwdrain(so)
 698         struct socket *so;
 699 {
 700         if (so->so_rcv.sb_cc)
 701                 so->so_state |= SS_FWDRAIN;
 702         else
 703                 sofcantsendmore(so);
 704 }
 705