route.c revision 43313 
1/*
2 *	      PPP Routing related Module
3 *
4 *	    Written by Toshiharu OHNO (tony-o@iij.ad.jp)
5 *
6 *   Copyright (C) 1994, Internet Initiative Japan, Inc. All rights reserverd.
7 *
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by the Internet Initiative Japan, Inc.  The name of the
14 * IIJ may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19 *
20 * $Id: route.c,v 1.54 1998/10/22 02:32:50 brian Exp $
21 *
22 */
23
24#include <sys/param.h>
25#include <sys/socket.h>
26#include <net/if_types.h>
27#include <net/route.h>
28#include <net/if.h>
29#include <netinet/in.h>
30#include <arpa/inet.h>
31#include <net/if_dl.h>
32#include <netinet/in_systm.h>
33#include <netinet/ip.h>
34#include <sys/un.h>
35
36#include <errno.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <sys/sysctl.h>
41#include <termios.h>
42
43#include "defs.h"
44#include "command.h"
45#include "mbuf.h"
46#include "log.h"
47#include "iplist.h"
48#include "timer.h"
49#include "throughput.h"
50#include "lqr.h"
51#include "hdlc.h"
52#include "fsm.h"
53#include "lcp.h"
54#include "ccp.h"
55#include "link.h"
56#include "slcompress.h"
57#include "ipcp.h"
58#include "filter.h"
59#include "descriptor.h"
60#include "mp.h"
61#ifndef NORADIUS
62#include "radius.h"
63#endif
64#include "bundle.h"
65#include "route.h"
66#include "prompt.h"
67#include "iface.h"
68
69static void
70p_sockaddr(struct prompt *prompt, struct sockaddr *phost,
71           struct sockaddr *pmask, int width)
72{
73  char buf[29];
74  struct sockaddr_in *ihost = (struct sockaddr_in *)phost;
75  struct sockaddr_in *mask = (struct sockaddr_in *)pmask;
76  struct sockaddr_dl *dl = (struct sockaddr_dl *)phost;
77
78  switch (phost->sa_family) {
79  case AF_INET:
80    if (!phost)
81      buf[0] = '\0';
82    else if (ihost->sin_addr.s_addr == INADDR_ANY)
83      strcpy(buf, "default");
84    else if (!mask)
85      strcpy(buf, inet_ntoa(ihost->sin_addr));
86    else {
87      u_int32_t msk = ntohl(mask->sin_addr.s_addr);
88      u_int32_t tst;
89      int bits;
90      int len;
91      struct sockaddr_in net;
92
93      for (tst = 1, bits=32; tst; tst <<= 1, bits--)
94        if (msk & tst)
95          break;
96
97      for (tst <<= 1; tst; tst <<= 1)
98        if (!(msk & tst))
99          break;
100
101      net.sin_addr.s_addr = ihost->sin_addr.s_addr & mask->sin_addr.s_addr;
102      strcpy(buf, inet_ntoa(net.sin_addr));
103      for (len = strlen(buf); len > 3; buf[len -= 2] = '\0')
104        if (strcmp(buf + len - 2, ".0"))
105          break;
106
107      if (tst)    /* non-contiguous :-( */
108        sprintf(buf + strlen(buf),"&0x%08lx", (u_long)msk);
109      else
110        sprintf(buf + strlen(buf), "/%d", bits);
111    }
112    break;
113
114  case AF_LINK:
115    if (dl->sdl_nlen)
116      snprintf(buf, sizeof buf, "%.*s", dl->sdl_nlen, dl->sdl_data);
117    else if (dl->sdl_alen) {
118      if (dl->sdl_type == IFT_ETHER) {
119        if (dl->sdl_alen < sizeof buf / 3) {
120          int f;
121          u_char *MAC;
122
123          MAC = (u_char *)dl->sdl_data + dl->sdl_nlen;
124          for (f = 0; f < dl->sdl_alen; f++)
125            sprintf(buf+f*3, "%02x:", MAC[f]);
126          buf[f*3-1] = '\0';
127        } else
128	  strcpy(buf, "??:??:??:??:??:??");
129      } else
130        sprintf(buf, "<IFT type %d>", dl->sdl_type);
131    }  else if (dl->sdl_slen)
132      sprintf(buf, "<slen %d?>", dl->sdl_slen);
133    else
134      sprintf(buf, "link#%d", dl->sdl_index);
135    break;
136
137  default:
138    sprintf(buf, "<AF type %d>", phost->sa_family);
139    break;
140  }
141
142  prompt_Printf(prompt, "%-*s ", width-1, buf);
143}
144
145static struct bits {
146  u_int32_t b_mask;
147  char b_val;
148} bits[] = {
149  { RTF_UP, 'U' },
150  { RTF_GATEWAY, 'G' },
151  { RTF_HOST, 'H' },
152  { RTF_REJECT, 'R' },
153  { RTF_DYNAMIC, 'D' },
154  { RTF_MODIFIED, 'M' },
155  { RTF_DONE, 'd' },
156  { RTF_CLONING, 'C' },
157  { RTF_XRESOLVE, 'X' },
158  { RTF_LLINFO, 'L' },
159  { RTF_STATIC, 'S' },
160  { RTF_PROTO1, '1' },
161  { RTF_PROTO2, '2' },
162  { RTF_BLACKHOLE, 'B' },
163#ifdef RTF_WASCLONED
164  { RTF_WASCLONED, 'W' },
165#endif
166#ifdef RTF_PRCLONING
167  { RTF_PRCLONING, 'c' },
168#endif
169#ifdef RTF_PROTO3
170  { RTF_PROTO3, '3' },
171#endif
172#ifdef RTF_BROADCAST
173  { RTF_BROADCAST, 'b' },
174#endif
175  { 0, '\0' }
176};
177
178#ifndef RTF_WASCLONED
179#define RTF_WASCLONED (0)
180#endif
181
182static void
183p_flags(struct prompt *prompt, u_int32_t f, int max)
184{
185  char name[33], *flags;
186  register struct bits *p = bits;
187
188  if (max > sizeof name - 1)
189    max = sizeof name - 1;
190
191  for (flags = name; p->b_mask && flags - name < max; p++)
192    if (p->b_mask & f)
193      *flags++ = p->b_val;
194  *flags = '\0';
195  prompt_Printf(prompt, "%-*.*s", max, max, name);
196}
197
198const char *
199Index2Nam(int idx)
200{
201  /*
202   * XXX: Maybe we should select() on the routing socket so that we can
203   *      notice interfaces that come & go (PCCARD support).
204   *      Or we could even support a signal that resets these so that
205   *      the PCCARD insert/remove events can signal ppp.
206   */
207  static char **ifs;		/* Figure these out once */
208  static int nifs, debug_done;	/* Figure out how many once, and debug once */
209
210  if (!nifs) {
211    int mib[6], have, had;
212    size_t needed;
213    char *buf, *ptr, *end;
214    struct sockaddr_dl *dl;
215    struct if_msghdr *ifm;
216
217    mib[0] = CTL_NET;
218    mib[1] = PF_ROUTE;
219    mib[2] = 0;
220    mib[3] = 0;
221    mib[4] = NET_RT_IFLIST;
222    mib[5] = 0;
223
224    if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
225      log_Printf(LogERROR, "Index2Nam: sysctl: estimate: %s\n",
226                 strerror(errno));
227      return "???";
228    }
229    if ((buf = malloc(needed)) == NULL)
230      return "???";
231    if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
232      free(buf);
233      return "???";
234    }
235    end = buf + needed;
236
237    have = 0;
238    for (ptr = buf; ptr < end; ptr += ifm->ifm_msglen) {
239      ifm = (struct if_msghdr *)ptr;
240      dl = (struct sockaddr_dl *)(ifm + 1);
241      if (ifm->ifm_index > 0) {
242        if (ifm->ifm_index > have) {
243          char **newifs;
244
245          had = have;
246          have = ifm->ifm_index + 5;
247          if (had)
248            newifs = (char **)realloc(ifs, sizeof(char *) * have);
249          else
250            newifs = (char **)malloc(sizeof(char *) * have);
251          if (!newifs) {
252            log_Printf(LogDEBUG, "Index2Nam: %s\n", strerror(errno));
253            nifs = 0;
254            if (ifs)
255              free(ifs);
256            return "???";
257          }
258          ifs = newifs;
259          memset(ifs + had, '\0', sizeof(char *) * (have - had));
260        }
261        if (ifs[ifm->ifm_index-1] == NULL) {
262          ifs[ifm->ifm_index-1] = (char *)malloc(dl->sdl_nlen+1);
263          memcpy(ifs[ifm->ifm_index-1], dl->sdl_data, dl->sdl_nlen);
264          ifs[ifm->ifm_index-1][dl->sdl_nlen] = '\0';
265          if (nifs < ifm->ifm_index)
266            nifs = ifm->ifm_index;
267        }
268      } else if (log_IsKept(LogDEBUG))
269        log_Printf(LogDEBUG, "Skipping out-of-range interface %d!\n",
270                  ifm->ifm_index);
271    }
272    free(buf);
273  }
274
275  if (log_IsKept(LogDEBUG) && !debug_done) {
276    int f;
277
278    log_Printf(LogDEBUG, "Found the following interfaces:\n");
279    for (f = 0; f < nifs; f++)
280      if (ifs[f] != NULL)
281        log_Printf(LogDEBUG, " Index %d, name \"%s\"\n", f+1, ifs[f]);
282    debug_done = 1;
283  }
284
285  if (idx < 1 || idx > nifs || ifs[idx-1] == NULL)
286    return "???";
287
288  return ifs[idx-1];
289}
290
291int
292route_Show(struct cmdargs const *arg)
293{
294  struct rt_msghdr *rtm;
295  struct sockaddr *sa_dst, *sa_gw, *sa_mask;
296  char *sp, *ep, *cp, *wp;
297  size_t needed;
298  int mib[6];
299
300  mib[0] = CTL_NET;
301  mib[1] = PF_ROUTE;
302  mib[2] = 0;
303  mib[3] = 0;
304  mib[4] = NET_RT_DUMP;
305  mib[5] = 0;
306  if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
307    log_Printf(LogERROR, "route_Show: sysctl: estimate: %s\n", strerror(errno));
308    return (1);
309  }
310  sp = malloc(needed);
311  if (sp == NULL)
312    return (1);
313  if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
314    log_Printf(LogERROR, "route_Show: sysctl: getroute: %s\n", strerror(errno));
315    free(sp);
316    return (1);
317  }
318  ep = sp + needed;
319
320  prompt_Printf(arg->prompt, "%-20s%-20sFlags  Netif\n",
321                "Destination", "Gateway");
322  for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
323    rtm = (struct rt_msghdr *) cp;
324    wp = (char *)(rtm+1);
325
326    if (rtm->rtm_addrs & RTA_DST) {
327      sa_dst = (struct sockaddr *)wp;
328      wp += sa_dst->sa_len;
329    } else
330      sa_dst = NULL;
331
332    if (rtm->rtm_addrs & RTA_GATEWAY) {
333      sa_gw = (struct sockaddr *)wp;
334      wp += sa_gw->sa_len;
335    } else
336      sa_gw = NULL;
337
338    if (rtm->rtm_addrs & RTA_NETMASK) {
339      sa_mask = (struct sockaddr *)wp;
340      wp += sa_mask->sa_len;
341    } else
342      sa_mask = NULL;
343
344    p_sockaddr(arg->prompt, sa_dst, sa_mask, 20);
345    p_sockaddr(arg->prompt, sa_gw, NULL, 20);
346
347    p_flags(arg->prompt, rtm->rtm_flags, 6);
348    prompt_Printf(arg->prompt, " %s\n", Index2Nam(rtm->rtm_index));
349  }
350  free(sp);
351  return 0;
352}
353
354/*
355 *  Delete routes associated with our interface
356 */
357void
358route_IfDelete(struct bundle *bundle, int all)
359{
360  struct rt_msghdr *rtm;
361  struct sockaddr *sa;
362  struct in_addr sa_dst, sa_none;
363  int pass;
364  size_t needed;
365  char *sp, *cp, *ep;
366  int mib[6];
367
368  log_Printf(LogDEBUG, "route_IfDelete (%d)\n", bundle->iface->index);
369  sa_none.s_addr = INADDR_ANY;
370
371  mib[0] = CTL_NET;
372  mib[1] = PF_ROUTE;
373  mib[2] = 0;
374  mib[3] = 0;
375  mib[4] = NET_RT_DUMP;
376  mib[5] = 0;
377  if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
378    log_Printf(LogERROR, "route_IfDelete: sysctl: estimate: %s\n",
379	      strerror(errno));
380    return;
381  }
382
383  sp = malloc(needed);
384  if (sp == NULL)
385    return;
386
387  if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
388    log_Printf(LogERROR, "route_IfDelete: sysctl: getroute: %s\n",
389	      strerror(errno));
390    free(sp);
391    return;
392  }
393  ep = sp + needed;
394
395  for (pass = 0; pass < 2; pass++) {
396    /*
397     * We do 2 passes.  The first deletes all cloned routes.  The second
398     * deletes all non-cloned routes.  This is necessary to avoid
399     * potential errors from trying to delete route X after route Y where
400     * route X was cloned from route Y (and is no longer there 'cos it
401     * may have gone with route Y).
402     */
403    if (RTF_WASCLONED == 0 && pass == 0)
404      /* So we can't tell ! */
405      continue;
406    for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
407      rtm = (struct rt_msghdr *) cp;
408      sa = (struct sockaddr *) (rtm + 1);
409      log_Printf(LogDEBUG, "route_IfDelete: addrs: %x, Netif: %d (%s),"
410                " flags: %x, dst: %s ?\n", rtm->rtm_addrs, rtm->rtm_index,
411                Index2Nam(rtm->rtm_index), rtm->rtm_flags,
412	        inet_ntoa(((struct sockaddr_in *) sa)->sin_addr));
413      if (rtm->rtm_addrs & RTA_DST && rtm->rtm_addrs & RTA_GATEWAY &&
414	  rtm->rtm_index == bundle->iface->index &&
415	  (all || (rtm->rtm_flags & RTF_GATEWAY))) {
416        sa_dst.s_addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
417        sa = (struct sockaddr *)((char *)sa + sa->sa_len);
418        if (sa->sa_family == AF_INET || sa->sa_family == AF_LINK) {
419          if ((pass == 0 && (rtm->rtm_flags & RTF_WASCLONED)) ||
420              (pass == 1 && !(rtm->rtm_flags & RTF_WASCLONED))) {
421            log_Printf(LogDEBUG, "route_IfDelete: Remove it (pass %d)\n", pass);
422            bundle_SetRoute(bundle, RTM_DELETE, sa_dst, sa_none, sa_none, 0, 0);
423          } else
424            log_Printf(LogDEBUG, "route_IfDelete: Skip it (pass %d)\n", pass);
425        } else
426          log_Printf(LogDEBUG,
427                    "route_IfDelete: Can't remove routes of %d family !\n",
428                    sa->sa_family);
429      }
430    }
431  }
432  free(sp);
433}
434
435int
436GetIfIndex(char *name)
437{
438  int idx;
439  const char *got;
440
441  idx = 1;
442  while (strcmp(got = Index2Nam(idx), "???"))
443    if (!strcmp(got, name))
444      return idx;
445    else
446      idx++;
447  return -1;
448}
449
450void
451route_Change(struct bundle *bundle, struct sticky_route *r,
452             struct in_addr me, struct in_addr peer)
453{
454  struct in_addr none, del;
455
456  none.s_addr = INADDR_ANY;
457  for (; r; r = r->next) {
458    if ((r->type & ROUTE_DSTMYADDR) && r->dst.s_addr != me.s_addr) {
459      del.s_addr = r->dst.s_addr & r->mask.s_addr;
460      bundle_SetRoute(bundle, RTM_DELETE, del, none, none, 1, 0);
461      r->dst = me;
462      if (r->type & ROUTE_GWHISADDR)
463        r->gw = peer;
464    } else if ((r->type & ROUTE_DSTHISADDR) && r->dst.s_addr != peer.s_addr) {
465      del.s_addr = r->dst.s_addr & r->mask.s_addr;
466      bundle_SetRoute(bundle, RTM_DELETE, del, none, none, 1, 0);
467      r->dst = peer;
468      if (r->type & ROUTE_GWHISADDR)
469        r->gw = peer;
470    } else if ((r->type & ROUTE_GWHISADDR) && r->gw.s_addr != peer.s_addr)
471      r->gw = peer;
472    bundle_SetRoute(bundle, RTM_ADD, r->dst, r->gw, r->mask, 1, 0);
473  }
474}
475
476void
477route_Clean(struct bundle *bundle, struct sticky_route *r)
478{
479  struct in_addr none, del;
480
481  none.s_addr = INADDR_ANY;
482  for (; r; r = r->next) {
483    del.s_addr = r->dst.s_addr & r->mask.s_addr;
484    bundle_SetRoute(bundle, RTM_DELETE, del, none, none, 1, 0);
485  }
486}
487
488void
489route_Add(struct sticky_route **rp, int type, struct in_addr dst,
490          struct in_addr mask, struct in_addr gw)
491{
492  struct sticky_route *r;
493  int dsttype = type & ROUTE_DSTANY;
494
495  r = NULL;
496  while (*rp) {
497    if ((dsttype && dsttype == ((*rp)->type & ROUTE_DSTANY)) ||
498        (!dsttype && (*rp)->dst.s_addr == dst.s_addr)) {
499      /* Oops, we already have this route - unlink it */
500      free(r);			/* impossible really  */
501      r = *rp;
502      *rp = r->next;
503    } else
504      rp = &(*rp)->next;
505  }
506
507  if (!r)
508    r = (struct sticky_route *)malloc(sizeof(struct sticky_route));
509  r->type = type;
510  r->next = NULL;
511  r->dst = dst;
512  r->mask = mask;
513  r->gw = gw;
514  *rp = r;
515}
516
517void
518route_Delete(struct sticky_route **rp, int type, struct in_addr dst)
519{
520  struct sticky_route *r;
521  int dsttype = type & ROUTE_DSTANY;
522
523  for (; *rp; rp = &(*rp)->next) {
524    if ((dsttype && dsttype == ((*rp)->type & ROUTE_DSTANY)) ||
525        (!dsttype && dst.s_addr == ((*rp)->dst.s_addr & (*rp)->mask.s_addr))) {
526      r = *rp;
527      *rp = r->next;
528      free(r);
529      break;
530    }
531  }
532}
533
534void
535route_DeleteAll(struct sticky_route **rp)
536{
537  struct sticky_route *r, *rn;
538
539  for (r = *rp; r; r = rn) {
540    rn = r->next;
541    free(r);
542  }
543  *rp = NULL;
544}
545
546void
547route_ShowSticky(struct prompt *p, struct sticky_route *r, const char *tag,
548                 int indent)
549{
550  int def;
551  int tlen = strlen(tag);
552
553  if (tlen + 2 > indent)
554    prompt_Printf(p, "%s:\n%*s", tag, indent, "");
555  else
556    prompt_Printf(p, "%s:%*s", tag, indent - tlen - 1, "");
557
558  for (; r; r = r->next) {
559    def = r->dst.s_addr == INADDR_ANY && r->mask.s_addr == INADDR_ANY;
560
561    prompt_Printf(p, "%*sadd ", tlen ? 0 : indent, "");
562    tlen = 0;
563    if (r->type & ROUTE_DSTMYADDR)
564      prompt_Printf(p, "MYADDR");
565    else if (r->type & ROUTE_DSTHISADDR)
566      prompt_Printf(p, "HISADDR");
567    else if (!def)
568      prompt_Printf(p, "%s", inet_ntoa(r->dst));
569
570    if (def)
571      prompt_Printf(p, "default ");
572    else
573      prompt_Printf(p, " %s ", inet_ntoa(r->mask));
574
575    if (r->type & ROUTE_GWHISADDR)
576      prompt_Printf(p, "HISADDR\n");
577    else
578      prompt_Printf(p, "%s\n", inet_ntoa(r->gw));
579  }
580}
581