usr.sbin/ppp/ncp.c

   1 /*-
   2  * Copyright (c) 2001 Brian Somers <brian@Awfulhak.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/usr.sbin/ppp/ncp.c,v 1.5.2.1 2002/09/01 02:12:29 brian Exp $
  27  * $DragonFly: src/usr.sbin/ppp/ncp.c,v 1.2 2003/06/17 04:30:00 dillon Exp $
  28  */
  29
  30 #include <sys/param.h>
  31 #include <netinet/in_systm.h>
  32 #include <netinet/in.h>
  33 #include <netinet/ip.h>
  34 #include <sys/socket.h>
  35 #include <net/route.h>
  36 #include <sys/un.h>
  37
  38 #include <errno.h>
  39 #include <resolv.h>
  40 #include <stdarg.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <termios.h>
  44
  45 #include "layer.h"
  46 #include "defs.h"
  47 #include "command.h"
  48 #include "mbuf.h"
  49 #include "log.h"
  50 #include "timer.h"
  51 #include "fsm.h"
  52 #include "iplist.h"
  53 #include "throughput.h"
  54 #include "slcompress.h"
  55 #include "lqr.h"
  56 #include "hdlc.h"
  57 #include "lcp.h"
  58 #include "ncpaddr.h"
  59 #include "ipcp.h"
  60 #include "filter.h"
  61 #include "descriptor.h"
  62 #include "async.h"
  63 #include "ccp.h"
  64 #include "link.h"
  65 #include "physical.h"
  66 #include "mp.h"
  67 #ifndef NORADIUS
  68 #include "radius.h"
  69 #endif
  70 #include "ipv6cp.h"
  71 #include "ncp.h"
  72 #include "bundle.h"
  73 #include "prompt.h"
  74 #include "route.h"
  75 #include "iface.h"
  76 #include "chat.h"
  77 #include "auth.h"
  78 #include "chap.h"
  79 #include "cbcp.h"
  80 #include "datalink.h"
  81
  82
  83 static u_short default_urgent_tcp_ports[] = {
  84   21,   /* ftp */
  85   22,   /* ssh */
  86   23,   /* telnet */
  87   513,  /* login */
  88   514,  /* shell */
  89   543,  /* klogin */
  90   544   /* kshell */
  91 };
  92
  93 #define NDEFTCPPORTS \
  94   (sizeof default_urgent_tcp_ports / sizeof default_urgent_tcp_ports[0])
  95
  96 void
  97 ncp_Init(struct ncp *ncp, struct bundle *bundle)
  98 {
  99   ncp->afq = AF_INET;
 100   ncp->route = NULL;
 101
 102   ncp->cfg.urgent.tcp.nports = ncp->cfg.urgent.tcp.maxports = NDEFTCPPORTS;
 103   ncp->cfg.urgent.tcp.port = (u_short *)malloc(NDEFTCPPORTS * sizeof(u_short));
 104   memcpy(ncp->cfg.urgent.tcp.port, default_urgent_tcp_ports,
 105          NDEFTCPPORTS * sizeof(u_short));
 106   ncp->cfg.urgent.tos = 1;
 107
 108   ncp->cfg.urgent.udp.nports = ncp->cfg.urgent.udp.maxports = 0;
 109   ncp->cfg.urgent.udp.port = NULL;
 110
 111   mp_Init(&ncp->mp, bundle);
 112
 113   /* Send over the first physical link by default */
 114   ipcp_Init(&ncp->ipcp, bundle, &bundle->links->physical->link,
 115             &bundle->fsm);
 116 #ifndef NOINET6
 117   ipv6cp_Init(&ncp->ipv6cp, bundle, &bundle->links->physical->link,
 118               &bundle->fsm);
 119 #endif
 120 }
 121
 122 void
 123 ncp_Destroy(struct ncp *ncp)
 124 {
 125   ipcp_Destroy(&ncp->ipcp);
 126 #ifndef NOINET6
 127   ipv6cp_Destroy(&ncp->ipv6cp);
 128 #endif
 129
 130   if (ncp->cfg.urgent.tcp.maxports) {
 131     ncp->cfg.urgent.tcp.nports = ncp->cfg.urgent.tcp.maxports = 0;
 132     free(ncp->cfg.urgent.tcp.port);
 133     ncp->cfg.urgent.tcp.port = NULL;
 134   }
 135   if (ncp->cfg.urgent.udp.maxports) {
 136     ncp->cfg.urgent.udp.nports = ncp->cfg.urgent.udp.maxports = 0;
 137     free(ncp->cfg.urgent.udp.port);
 138     ncp->cfg.urgent.udp.port = NULL;
 139   }
 140 }
 141
 142 int
 143 ncp_fsmStart(struct ncp *ncp, struct bundle *bundle)
 144 {
 145   int res = 0;
 146
 147 #ifndef NOINET6
 148   if (Enabled(bundle, OPT_IPCP)) {
 149 #endif
 150     fsm_Up(&ncp->ipcp.fsm);
 151     fsm_Open(&ncp->ipcp.fsm);
 152     res++;
 153 #ifndef NOINET6
 154   }
 155
 156   if (Enabled(bundle, OPT_IPV6CP)) {
 157     fsm_Up(&ncp->ipv6cp.fsm);
 158     fsm_Open(&ncp->ipv6cp.fsm);
 159     res++;
 160   }
 161 #endif
 162
 163   return res;
 164 }
 165
 166 void
 167 ncp_IfaceAddrAdded(struct ncp *ncp, const struct iface_addr *addr)
 168 {
 169   switch (ncprange_family(&addr->ifa)) {
 170   case AF_INET:
 171     ipcp_IfaceAddrAdded(&ncp->ipcp, addr);
 172     break;
 173 #ifndef NOINET6
 174   case AF_INET6:
 175     ipv6cp_IfaceAddrAdded(&ncp->ipv6cp, addr);
 176     break;
 177 #endif
 178   }
 179 }
 180
 181 void
 182 ncp_IfaceAddrDeleted(struct ncp *ncp, const struct iface_addr *addr)
 183 {
 184   if (ncprange_family(&addr->ifa) == AF_INET)
 185     ipcp_IfaceAddrDeleted(&ncp->ipcp, addr);
 186 }
 187
 188 void
 189 ncp_SetLink(struct ncp *ncp, struct link *l)
 190 {
 191   ipcp_SetLink(&ncp->ipcp, l);
 192 #ifndef NOINET6
 193   ipv6cp_SetLink(&ncp->ipv6cp, l);
 194 #endif
 195 }
 196
 197 /*
 198  * Enqueue a packet of the given address family.  Nothing will make it
 199  * down to the physical link level 'till ncp_FillPhysicalQueues() is used.
 200  */
 201 void
 202 ncp_Enqueue(struct ncp *ncp, int af, unsigned pri, char *ptr, int count)
 203 {
 204 #ifndef NOINET6
 205   struct ipv6cp *ipv6cp = &ncp->ipv6cp;
 206 #endif
 207   struct ipcp *ipcp = &ncp->ipcp;
 208   struct mbuf *bp;
 209
 210   /*
 211    * We allocate an extra 6 bytes, four at the front and two at the end.
 212    * This is an optimisation so that we need to do less work in
 213    * m_prepend() in acf_LayerPush() and proto_LayerPush() and
 214    * appending in hdlc_LayerPush().
 215    */
 216
 217   switch (af) {
 218   case AF_INET:
 219     if (pri >= IPCP_QUEUES(ipcp)) {
 220       log_Printf(LogERROR, "Can't store in ip queue %u\n", pri);
 221       break;
 222     }
 223
 224     bp = m_get(count + 6, MB_IPOUT);
 225     bp->m_offset += 4;
 226     bp->m_len -= 6;
 227     memcpy(MBUF_CTOP(bp), ptr, count);
 228     m_enqueue(ipcp->Queue + pri, bp);
 229     break;
 230
 231 #ifndef NOINET6
 232   case AF_INET6:
 233     if (pri >= IPV6CP_QUEUES(ipcp)) {
 234       log_Printf(LogERROR, "Can't store in ipv6 queue %u\n", pri);
 235       break;
 236     }
 237
 238     bp = m_get(count + 6, MB_IPOUT);
 239     bp->m_offset += 4;
 240     bp->m_len -= 6;
 241     memcpy(MBUF_CTOP(bp), ptr, count);
 242     m_enqueue(ipv6cp->Queue + pri, bp);
 243     break;
 244 #endif
 245
 246   default:
 247       log_Printf(LogERROR, "Can't enqueue protocol family %d\n", af);
 248   }
 249 }
 250
 251 /*
 252  * How many packets are queued to go out ?
 253  */
 254 size_t
 255 ncp_QueueLen(struct ncp *ncp)
 256 {
 257   size_t result;
 258
 259   result = ipcp_QueueLen(&ncp->ipcp);
 260 #ifndef NOINET6
 261   result += ipv6cp_QueueLen(&ncp->ipv6cp);
 262 #endif
 263   result += mp_QueueLen(&ncp->mp);      /* Usually empty */
 264
 265   return result;
 266 }
 267
 268 /*
 269  * Ditch all queued packets.  This is usually done after our choked timer
 270  * has fired - which happens because we couldn't send any traffic over
 271  * any links for some time.
 272  */
 273 void
 274 ncp_DeleteQueues(struct ncp *ncp)
 275 {
 276 #ifndef NOINET6
 277   struct ipv6cp *ipv6cp = &ncp->ipv6cp;
 278 #endif
 279   struct ipcp *ipcp = &ncp->ipcp;
 280   struct mp *mp = &ncp->mp;
 281   struct mqueue *q;
 282
 283   for (q = ipcp->Queue; q < ipcp->Queue + IPCP_QUEUES(ipcp); q++)
 284     while (q->top)
 285       m_freem(m_dequeue(q));
 286
 287 #ifndef NOINET6
 288   for (q = ipv6cp->Queue; q < ipv6cp->Queue + IPV6CP_QUEUES(ipv6cp); q++)
 289     while (q->top)
 290       m_freem(m_dequeue(q));
 291 #endif
 292
 293   link_DeleteQueue(&mp->link);  /* Usually empty anyway */
 294 }
 295
 296 /*
 297  * Arrange that each of our links has at least one packet.  We keep the
 298  * number of packets queued at the link level to a minimum so that the
 299  * loss of a link in multi-link mode results in the minimum number of
 300  * dropped packets.
 301  */
 302 size_t
 303 ncp_FillPhysicalQueues(struct ncp *ncp, struct bundle *bundle)
 304 {
 305   size_t total;
 306
 307   if (bundle->ncp.mp.active)
 308     total = mp_FillPhysicalQueues(bundle);
 309   else {
 310     struct datalink *dl;
 311     size_t add;
 312
 313     for (total = 0, dl = bundle->links; dl; dl = dl->next)
 314       if (dl->state == DATALINK_OPEN) {
 315         add = link_QueueLen(&dl->physical->link);
 316         if (add == 0 && dl->physical->out == NULL)
 317           add = ncp_PushPacket(ncp, &ncp->afq, &dl->physical->link);
 318         total += add;
 319       }
 320   }
 321
 322   return total + ncp_QueueLen(&bundle->ncp);
 323 }
 324
 325 /*
 326  * Push a packet into the given link.  ``af'' is used as a persistent record
 327  * of what is to be pushed next, coming either from mp->out or ncp->afq.
 328  */
 329 int
 330 ncp_PushPacket(struct ncp *ncp __unused, int *af, struct link *l)
 331 {
 332   struct bundle *bundle = l->lcp.fsm.bundle;
 333   int res;
 334
 335 #ifndef NOINET6
 336   if (*af == AF_INET) {
 337     if ((res = ipcp_PushPacket(&bundle->ncp.ipcp, l)))
 338       *af = AF_INET6;
 339     else
 340       res = ipv6cp_PushPacket(&bundle->ncp.ipv6cp, l);
 341   } else {
 342     if ((res = ipv6cp_PushPacket(&bundle->ncp.ipv6cp, l)))
 343       *af = AF_INET;
 344     else
 345       res = ipcp_PushPacket(&bundle->ncp.ipcp, l);
 346   }
 347 #else
 348   res = ipcp_PushPacket(&bundle->ncp.ipcp, l);
 349 #endif
 350
 351   return res;
 352 }
 353
 354 int
 355 ncp_IsUrgentPort(struct port_range *range, u_short src, u_short dst)
 356 {
 357   unsigned f;
 358
 359   for (f = 0; f < range->nports; f++)
 360     if (range->port[f] == src || range->port[f] == dst)
 361       return 1;
 362
 363   return 0;
 364 }
 365
 366 void
 367 ncp_AddUrgentPort(struct port_range *range, u_short port)
 368 {
 369   u_short *newport;
 370   unsigned p;
 371
 372   if (range->nports == range->maxports) {
 373     range->maxports += 10;
 374     newport = (u_short *)realloc(range->port,
 375                                  range->maxports * sizeof(u_short));
 376     if (newport == NULL) {
 377       log_Printf(LogERROR, "ncp_AddUrgentPort: realloc: %s\n",
 378                  strerror(errno));
 379       range->maxports -= 10;
 380       return;
 381     }
 382     range->port = newport;
 383   }
 384
 385   for (p = 0; p < range->nports; p++)
 386     if (range->port[p] == port) {
 387       log_Printf(LogWARN, "%u: Port already set to urgent\n", port);
 388       break;
 389     } else if (range->port[p] > port) {
 390       memmove(range->port + p + 1, range->port + p,
 391               (range->nports - p) * sizeof(u_short));
 392       range->port[p] = port;
 393       range->nports++;
 394       break;
 395     }
 396
 397   if (p == range->nports)
 398     range->port[range->nports++] = port;
 399 }
 400
 401 void
 402 ncp_RemoveUrgentPort(struct port_range *range, u_short port)
 403 {
 404   unsigned p;
 405
 406   for (p = 0; p < range->nports; p++)
 407     if (range->port[p] == port) {
 408       if (p + 1 != range->nports)
 409         memmove(range->port + p, range->port + p + 1,
 410                 (range->nports - p - 1) * sizeof(u_short));
 411       range->nports--;
 412       return;
 413     }
 414
 415   if (p == range->nports)
 416     log_Printf(LogWARN, "%u: Port not set to urgent\n", port);
 417 }
 418
 419 void
 420 ncp_ClearUrgentPorts(struct port_range *range)
 421 {
 422   range->nports = 0;
 423 }
 424
 425 int
 426 ncp_Show(struct cmdargs const *arg)
 427 {
 428   struct ncp *ncp = &arg->bundle->ncp;
 429   unsigned p;
 430
 431 #ifndef NOINET6
 432   prompt_Printf(arg->prompt, "Next queued AF: %s\n",
 433                 ncp->afq == AF_INET6 ? "inet6" : "inet");
 434 #endif
 435
 436   if (ncp->route) {
 437     prompt_Printf(arg->prompt, "\n");
 438     route_ShowSticky(arg->prompt, ncp->route, "Sticky routes", 1);
 439   }
 440
 441   prompt_Printf(arg->prompt, "\nDefaults:\n");
 442   prompt_Printf(arg->prompt, "  sendpipe:      ");
 443   if (ncp->cfg.sendpipe > 0)
 444     prompt_Printf(arg->prompt, "%-20ld\n", ncp->cfg.sendpipe);
 445   else
 446     prompt_Printf(arg->prompt, "unspecified\n");
 447   prompt_Printf(arg->prompt, "  recvpipe:      ");
 448   if (ncp->cfg.recvpipe > 0)
 449     prompt_Printf(arg->prompt, "%ld\n", ncp->cfg.recvpipe);
 450   else
 451     prompt_Printf(arg->prompt, "unspecified\n");
 452
 453   prompt_Printf(arg->prompt, "\n  Urgent ports\n");
 454   prompt_Printf(arg->prompt, "         TCP:    ");
 455   if (ncp->cfg.urgent.tcp.nports == 0)
 456     prompt_Printf(arg->prompt, "none");
 457   else
 458     for (p = 0; p < ncp->cfg.urgent.tcp.nports; p++) {
 459       if (p)
 460         prompt_Printf(arg->prompt, ", ");
 461       prompt_Printf(arg->prompt, "%u", ncp->cfg.urgent.tcp.port[p]);
 462     }
 463
 464   prompt_Printf(arg->prompt, "\n         UDP:    ");
 465   if (ncp->cfg.urgent.udp.nports == 0)
 466     prompt_Printf(arg->prompt, "none");
 467   else
 468     for (p = 0; p < ncp->cfg.urgent.udp.nports; p++) {
 469       if (p)
 470         prompt_Printf(arg->prompt, ", ");
 471       prompt_Printf(arg->prompt, "%u", ncp->cfg.urgent.udp.port[p]);
 472     }
 473   prompt_Printf(arg->prompt, "\n         TOS:    %s\n\n",
 474                 ncp->cfg.urgent.tos ? "yes" : "no");
 475
 476   return 0;
 477 }
 478
 479 int
 480 ncp_LayersOpen(struct ncp *ncp)
 481 {
 482   int n;
 483
 484   n = !!(ncp->ipcp.fsm.state == ST_OPENED);
 485 #ifndef NOINET6
 486   n += !!(ncp->ipv6cp.fsm.state == ST_OPENED);
 487 #endif
 488
 489   return n;
 490 }
 491
 492 int
 493 ncp_LayersUnfinished(struct ncp *ncp)
 494 {
 495   int n = 0;
 496
 497   if (ncp->ipcp.fsm.state > ST_CLOSED ||
 498       ncp->ipcp.fsm.state == ST_STARTING)
 499     n++;
 500
 501 #ifndef NOINET6
 502   if (ncp->ipv6cp.fsm.state > ST_CLOSED ||
 503       ncp->ipv6cp.fsm.state == ST_STARTING)
 504     n++;
 505 #endif
 506
 507   return n;
 508 }
 509
 510 void
 511 ncp_Close(struct ncp *ncp)
 512 {
 513   if (ncp->ipcp.fsm.state > ST_CLOSED ||
 514       ncp->ipcp.fsm.state == ST_STARTING)
 515     fsm_Close(&ncp->ipcp.fsm);
 516
 517 #ifndef NOINET6
 518   if (ncp->ipv6cp.fsm.state > ST_CLOSED ||
 519       ncp->ipv6cp.fsm.state == ST_STARTING)
 520     fsm_Close(&ncp->ipv6cp.fsm);
 521 #endif
 522 }
 523
 524 void
 525 ncp2initial(struct ncp *ncp)
 526 {
 527   fsm2initial(&ncp->ipcp.fsm);
 528 #ifndef NOINET6
 529   fsm2initial(&ncp->ipv6cp.fsm);
 530 #endif
 531 }