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