usr.sbin/ppp/link.c

   1 /*-
   2  * Copyright (c) 1998 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/link.c,v 1.16.2.2 2002/09/01 02:12:28 brian Exp $
  27  * $DragonFly: src/usr.sbin/ppp/link.c,v 1.3 2008/05/19 10:19:49 corecode Exp $
  28  *
  29  */
  30
  31 #include <sys/types.h>
  32 #include <sys/select.h>
  33 #include <netinet/in_systm.h>
  34 #include <sys/socket.h>
  35 #include <sys/un.h>
  36 #include <netinet/in.h>
  37 #include <netinet/ip.h>
  38
  39 #include <stdarg.h>
  40 #include <stdio.h>
  41 #include <string.h>
  42 #include <termios.h>
  43
  44 #include "defs.h"
  45 #include "layer.h"
  46 #include "mbuf.h"
  47 #include "log.h"
  48 #include "timer.h"
  49 #include "lqr.h"
  50 #include "hdlc.h"
  51 #include "throughput.h"
  52 #include "proto.h"
  53 #include "fsm.h"
  54 #include "descriptor.h"
  55 #include "lcp.h"
  56 #include "ccp.h"
  57 #include "link.h"
  58 #include "prompt.h"
  59 #include "async.h"
  60 #include "physical.h"
  61 #include "mp.h"
  62 #include "iplist.h"
  63 #include "slcompress.h"
  64 #include "ncpaddr.h"
  65 #include "ip.h"
  66 #include "ipcp.h"
  67 #include "ipv6cp.h"
  68 #include "auth.h"
  69 #include "pap.h"
  70 #include "chap.h"
  71 #include "cbcp.h"
  72 #include "command.h"
  73
  74 static void Despatch(struct bundle *, struct link *, struct mbuf *, u_short);
  75
  76 static inline void
  77 link_AddInOctets(struct link *l, int n)
  78 {
  79   if (l->stats.gather) {
  80     throughput_addin(&l->stats.total, n);
  81     if (l->stats.parent)
  82       throughput_addin(l->stats.parent, n);
  83   }
  84 }
  85
  86 static inline void
  87 link_AddOutOctets(struct link *l, int n)
  88 {
  89   if (l->stats.gather) {
  90     throughput_addout(&l->stats.total, n);
  91     if (l->stats.parent)
  92       throughput_addout(l->stats.parent, n);
  93   }
  94 }
  95
  96 void
  97 link_SequenceQueue(struct link *l)
  98 {
  99   struct mqueue *queue, *highest;
 100
 101   log_Printf(LogDEBUG, "link_SequenceQueue\n");
 102
 103   highest = LINK_HIGHQ(l);
 104   for (queue = l->Queue; queue < highest; queue++)
 105     while (queue->len)
 106       m_enqueue(highest, m_dequeue(queue));
 107 }
 108
 109 void
 110 link_DeleteQueue(struct link *l)
 111 {
 112   struct mqueue *queue, *highest;
 113
 114   highest = LINK_HIGHQ(l);
 115   for (queue = l->Queue; queue <= highest; queue++)
 116     while (queue->top)
 117       m_freem(m_dequeue(queue));
 118 }
 119
 120 size_t
 121 link_QueueLen(struct link *l)
 122 {
 123   unsigned i;
 124   size_t len;
 125
 126   for (i = 0, len = 0; i < LINK_QUEUES(l); i++)
 127     len += l->Queue[i].len;
 128
 129   return len;
 130 }
 131
 132 size_t
 133 link_QueueBytes(struct link *l)
 134 {
 135   unsigned i;
 136   size_t len, bytes;
 137   struct mbuf *m;
 138
 139   bytes = 0;
 140   for (i = 0, len = 0; i < LINK_QUEUES(l); i++) {
 141     len = l->Queue[i].len;
 142     m = l->Queue[i].top;
 143     while (len--) {
 144       bytes += m_length(m);
 145       m = m->m_nextpkt;
 146     }
 147   }
 148
 149   return bytes;
 150 }
 151
 152 struct mbuf *
 153 link_Dequeue(struct link *l)
 154 {
 155   int pri;
 156   struct mbuf *bp;
 157
 158   for (bp = NULL, pri = LINK_QUEUES(l) - 1; pri >= 0; pri--)
 159     if (l->Queue[pri].len) {
 160       bp = m_dequeue(l->Queue + pri);
 161       log_Printf(LogDEBUG, "link_Dequeue: Dequeued from queue %d,"
 162                 " containing %lu more packets\n", pri,
 163                 (u_long)l->Queue[pri].len);
 164       break;
 165     }
 166
 167   return bp;
 168 }
 169
 170 static struct protostatheader {
 171   u_short number;
 172   const char *name;
 173 } ProtocolStat[NPROTOSTAT] = {
 174   { PROTO_IP, "IP" },
 175   { PROTO_VJUNCOMP, "VJ_UNCOMP" },
 176   { PROTO_VJCOMP, "VJ_COMP" },
 177   { PROTO_COMPD, "COMPD" },
 178   { PROTO_ICOMPD, "ICOMPD" },
 179   { PROTO_LCP, "LCP" },
 180   { PROTO_IPCP, "IPCP" },
 181   { PROTO_CCP, "CCP" },
 182   { PROTO_PAP, "PAP" },
 183   { PROTO_LQR, "LQR" },
 184   { PROTO_CHAP, "CHAP" },
 185   { PROTO_MP, "MULTILINK" },
 186   { 0, "Others" }
 187 };
 188
 189 void
 190 link_ProtocolRecord(struct link *l, u_short proto, int type)
 191 {
 192   int i;
 193
 194   for (i = 0; i < NPROTOSTAT; i++)
 195     if (ProtocolStat[i].number == proto)
 196       break;
 197
 198   if (type == PROTO_IN)
 199     l->proto_in[i]++;
 200   else
 201     l->proto_out[i]++;
 202 }
 203
 204 void
 205 link_ReportProtocolStatus(struct link *l, struct prompt *prompt)
 206 {
 207   int i;
 208
 209   prompt_Printf(prompt, "    Protocol     in        out      "
 210                 "Protocol      in       out\n");
 211   for (i = 0; i < NPROTOSTAT; i++) {
 212     prompt_Printf(prompt, "   %-9s: %8lu, %8lu",
 213             ProtocolStat[i].name, l->proto_in[i], l->proto_out[i]);
 214     if ((i % 2) == 0)
 215       prompt_Printf(prompt, "\n");
 216   }
 217   if (!(i % 2))
 218     prompt_Printf(prompt, "\n");
 219 }
 220
 221 void
 222 link_PushPacket(struct link *l, struct mbuf *bp, struct bundle *b, int pri,
 223                 u_short proto)
 224 {
 225   int layer;
 226
 227   /*
 228    * When we ``push'' a packet into the link, it gets processed by the
 229    * ``push'' function in each layer starting at the top.
 230    * We never expect the result of a ``push'' to be more than one
 231    * packet (as we do with ``pull''s).
 232    */
 233
 234   if(pri < 0 || (unsigned)pri >= LINK_QUEUES(l))
 235     pri = 0;
 236
 237   for (layer = l->nlayers; layer && bp; layer--)
 238     if (l->layer[layer - 1]->push != NULL)
 239       bp = (*l->layer[layer - 1]->push)(b, l, bp, pri, &proto);
 240
 241   if (bp) {
 242     link_AddOutOctets(l, m_length(bp));
 243     log_Printf(LogDEBUG, "link_PushPacket: Transmit proto 0x%04x\n", proto);
 244     m_enqueue(l->Queue + pri, m_pullup(bp));
 245   }
 246 }
 247
 248 void
 249 link_PullPacket(struct link *l, char *buf, size_t len, struct bundle *b)
 250 {
 251   struct mbuf *bp, *lbp[LAYER_MAX], *next;
 252   u_short lproto[LAYER_MAX], proto;
 253   int layer;
 254
 255   /*
 256    * When we ``pull'' a packet from the link, it gets processed by the
 257    * ``pull'' function in each layer starting at the bottom.
 258    * Each ``pull'' may produce multiple packets, chained together using
 259    * bp->m_nextpkt.
 260    * Each packet that results from each pull has to be pulled through
 261    * all of the higher layers before the next resulting packet is pulled
 262    * through anything; this ensures that packets that depend on the
 263    * fsm state resulting from the receipt of the previous packet aren't
 264    * surprised.
 265    */
 266
 267   link_AddInOctets(l, len);
 268
 269   memset(lbp, '\0', sizeof lbp);
 270   lbp[0] = m_get(len, MB_UNKNOWN);
 271   memcpy(MBUF_CTOP(lbp[0]), buf, len);
 272   lproto[0] = 0;
 273   layer = 0;
 274
 275   while (layer || lbp[layer]) {
 276     if (lbp[layer] == NULL) {
 277       layer--;
 278       continue;
 279     }
 280     bp = lbp[layer];
 281     lbp[layer] = bp->m_nextpkt;
 282     bp->m_nextpkt = NULL;
 283     proto = lproto[layer];
 284
 285     if (l->layer[layer]->pull != NULL)
 286       bp = (*l->layer[layer]->pull)(b, l, bp, &proto);
 287
 288     if (layer == l->nlayers - 1) {
 289       /* We've just done the top layer, despatch the packet(s) */
 290       while (bp) {
 291         next = bp->m_nextpkt;
 292         bp->m_nextpkt = NULL;
 293         log_Printf(LogDEBUG, "link_PullPacket: Despatch proto 0x%04x\n", proto);
 294         Despatch(b, l, bp, proto);
 295         bp = next;
 296       }
 297     } else {
 298       lbp[++layer] = bp;
 299       lproto[layer] = proto;
 300     }
 301   }
 302 }
 303
 304 int
 305 link_Stack(struct link *l, struct layer *layer)
 306 {
 307   if (l->nlayers == sizeof l->layer / sizeof l->layer[0]) {
 308     log_Printf(LogERROR, "%s: Oops, cannot stack a %s layer...\n",
 309                l->name, layer->name);
 310     return 0;
 311   }
 312   l->layer[l->nlayers++] = layer;
 313   return 1;
 314 }
 315
 316 void
 317 link_EmptyStack(struct link *l)
 318 {
 319   l->nlayers = 0;
 320 }
 321
 322 static const struct {
 323   u_short proto;
 324   struct mbuf *(*fn)(struct bundle *, struct link *, struct mbuf *);
 325 } despatcher[] = {
 326   { PROTO_IP, ipv4_Input },
 327 #ifndef NOINET6
 328   { PROTO_IPV6, ipv6_Input },
 329 #endif
 330   { PROTO_MP, mp_Input },
 331   { PROTO_LCP, lcp_Input },
 332   { PROTO_IPCP, ipcp_Input },
 333 #ifndef NOINET6
 334   { PROTO_IPV6CP, ipv6cp_Input },
 335 #endif
 336   { PROTO_PAP, pap_Input },
 337   { PROTO_CHAP, chap_Input },
 338   { PROTO_CCP, ccp_Input },
 339   { PROTO_LQR, lqr_Input },
 340   { PROTO_CBCP, cbcp_Input }
 341 };
 342
 343 #define DSIZE (sizeof despatcher / sizeof despatcher[0])
 344
 345 static void
 346 Despatch(struct bundle *bundle, struct link *l, struct mbuf *bp, u_short proto)
 347 {
 348   unsigned f;
 349
 350   for (f = 0; f < DSIZE; f++)
 351     if (despatcher[f].proto == proto) {
 352       bp = (*despatcher[f].fn)(bundle, l, bp);
 353       break;
 354     }
 355
 356   if (bp) {
 357     struct physical *p = link2physical(l);
 358
 359     log_Printf(LogPHASE, "%s protocol 0x%04x (%s)\n",
 360                f == DSIZE ? "Unknown" : "Unexpected", proto,
 361                hdlc_Protocol2Nam(proto));
 362     bp = m_pullup(proto_Prepend(bp, proto, 0, 0));
 363     lcp_SendProtoRej(&l->lcp, MBUF_CTOP(bp), bp->m_len);
 364     if (p) {
 365       p->hdlc.lqm.SaveInDiscards++;
 366       p->hdlc.stats.unknownproto++;
 367     }
 368     m_freem(bp);
 369   }
 370 }
 371
 372 int
 373 link_ShowLayers(struct cmdargs const *arg)
 374 {
 375   struct link *l = command_ChooseLink(arg);
 376   int layer;
 377
 378   for (layer = l->nlayers; layer; layer--)
 379     prompt_Printf(arg->prompt, "%s%s", layer == l->nlayers ? "" : ", ",
 380                   l->layer[layer - 1]->name);
 381   if (l->nlayers)
 382     prompt_Printf(arg->prompt, "\n");
 383
 384   return 0;
 385 }