route.c revision 31690 
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 1.30 1997/12/07 04:09:15 brian Exp $
21 *
22 */
23
24#include <sys/param.h>
25#include <sys/time.h>
26#include <sys/socket.h>
27#include <net/if_types.h>
28#include <net/route.h>
29#include <net/if.h>
30#include <netinet/in_systm.h>
31#include <netinet/in.h>
32#include <arpa/inet.h>
33#include <net/if_dl.h>
34
35#include <errno.h>
36#include <machine/endian.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <sys/ioctl.h>
41#include <sys/sysctl.h>
42#include <unistd.h>
43
44#include "command.h"
45#include "mbuf.h"
46#include "log.h"
47#include "loadalias.h"
48#include "defs.h"
49#include "vars.h"
50#include "id.h"
51#include "os.h"
52#include "ipcp.h"
53#include "iplist.h"
54#include "route.h"
55
56static int IfIndex;
57static const char *Index2Nam(int);
58
59struct rtmsg {
60  struct rt_msghdr m_rtm;
61  char m_space[64];
62};
63
64static int seqno;
65
66void
67OsSetRoute(int cmd,
68	   struct in_addr dst,
69	   struct in_addr gateway,
70	   struct in_addr mask)
71{
72  struct rtmsg rtmes;
73  int s, nb, wb;
74  char *cp;
75  const char *cmdstr;
76  struct sockaddr_in rtdata;
77
78  cmdstr = (cmd == RTM_ADD ? "Add" : "Delete");
79  s = ID0socket(PF_ROUTE, SOCK_RAW, 0);
80  if (s < 0) {
81    LogPrintf(LogERROR, "OsSetRoute: socket(): %s\n", strerror(errno));
82    return;
83  }
84  memset(&rtmes, '\0', sizeof(rtmes));
85  rtmes.m_rtm.rtm_version = RTM_VERSION;
86  rtmes.m_rtm.rtm_type = cmd;
87  rtmes.m_rtm.rtm_addrs = RTA_DST;
88  rtmes.m_rtm.rtm_seq = ++seqno;
89  rtmes.m_rtm.rtm_pid = getpid();
90  rtmes.m_rtm.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
91
92  memset(&rtdata, '\0', sizeof(rtdata));
93  rtdata.sin_len = 16;
94  rtdata.sin_family = AF_INET;
95  rtdata.sin_port = 0;
96  rtdata.sin_addr = dst;
97
98  cp = rtmes.m_space;
99  memcpy(cp, &rtdata, 16);
100  cp += 16;
101  if (cmd == RTM_ADD)
102    if (gateway.s_addr == INADDR_ANY) {
103      /* Add a route through the interface */
104      struct sockaddr_dl dl;
105      const char *iname;
106      int ilen;
107
108      iname = Index2Nam(IfIndex);
109      ilen = strlen(iname);
110      dl.sdl_len = sizeof(dl)-sizeof(dl.sdl_data)+ilen;
111      dl.sdl_family = AF_LINK;
112      dl.sdl_index = IfIndex;
113      dl.sdl_type = 0;
114      dl.sdl_nlen = ilen;
115      dl.sdl_alen = 0;
116      dl.sdl_slen = 0;
117      strcpy(dl.sdl_data, iname);
118
119      memcpy(cp, &dl, dl.sdl_len);
120      cp += dl.sdl_len;
121      rtmes.m_rtm.rtm_addrs |= RTA_GATEWAY;
122    } else {
123      rtdata.sin_addr = gateway;
124      memcpy(cp, &rtdata, 16);
125      cp += 16;
126      rtmes.m_rtm.rtm_addrs |= RTA_GATEWAY;
127    }
128
129  if (dst.s_addr == INADDR_ANY)
130    mask.s_addr = INADDR_ANY;
131
132  if (cmd == RTM_ADD || dst.s_addr == INADDR_ANY) {
133    rtdata.sin_addr = mask;
134    memcpy(cp, &rtdata, 16);
135    cp += 16;
136    rtmes.m_rtm.rtm_addrs |= RTA_NETMASK;
137  }
138
139  nb = cp - (char *) &rtmes;
140  rtmes.m_rtm.rtm_msglen = nb;
141  wb = write(s, &rtmes, nb);
142  if (wb < 0) {
143    LogPrintf(LogTCPIP, "OsSetRoute: Dst = %s\n", inet_ntoa(dst));
144    LogPrintf(LogTCPIP, "OsSetRoute:  Gateway = %s\n", inet_ntoa(gateway));
145    LogPrintf(LogTCPIP, "OsSetRoute:  Mask = %s\n", inet_ntoa(mask));
146    switch (rtmes.m_rtm.rtm_errno) {
147    case EEXIST:
148      LogPrintf(LogWARN, "Add route failed: %s already exists\n",
149                inet_ntoa(dst));
150      break;
151    case ESRCH:
152      LogPrintf(LogWARN, "Del route failed: %s: Non-existent\n",
153                inet_ntoa(dst));
154      break;
155    case 0:
156      LogPrintf(LogWARN, "%s route failed: %s\n", cmdstr, strerror(errno));
157      break;
158    case ENOBUFS:
159    default:
160      LogPrintf(LogWARN, "%s route failed: %s\n",
161		cmdstr, strerror(rtmes.m_rtm.rtm_errno));
162      break;
163    }
164  }
165  LogPrintf(LogDEBUG, "wrote %d: cmd = %s, dst = %x, gateway = %x\n",
166            wb, cmdstr, dst.s_addr, gateway.s_addr);
167  close(s);
168}
169
170static void
171p_sockaddr(struct sockaddr *phost, struct sockaddr *pmask, int width)
172{
173  char buf[29];
174  struct sockaddr_in *ihost = (struct sockaddr_in *)phost;
175  struct sockaddr_in *mask = (struct sockaddr_in *)pmask;
176  struct sockaddr_dl *dl = (struct sockaddr_dl *)phost;
177
178  switch (phost->sa_family) {
179  case AF_INET:
180    if (!phost)
181      buf[0] = '\0';
182    else if (ihost->sin_addr.s_addr == INADDR_ANY)
183      strcpy(buf, "default");
184    else if (!mask)
185      strcpy(buf, inet_ntoa(ihost->sin_addr));
186    else {
187      u_int msk = ntohl(mask->sin_addr.s_addr);
188      u_int tst;
189      int bits;
190      int len;
191      struct sockaddr_in net;
192
193      for (tst = 1, bits=32; tst; tst <<= 1, bits--)
194        if (msk & tst)
195          break;
196
197      for (tst <<=1; tst; tst <<= 1)
198        if (!(msk & tst))
199          break;
200
201      net.sin_addr.s_addr = ihost->sin_addr.s_addr & mask->sin_addr.s_addr;
202      sprintf(buf, "%s", inet_ntoa(net.sin_addr));
203      for (len = strlen(buf); len > 3; buf[len-=2] = '\0')
204        if (strcmp(buf+len-2, ".0"))
205          break;
206
207      if (tst)    /* non-contiguous :-( */
208        sprintf(buf+strlen(buf),"&0x%08x", msk);
209      else
210        sprintf(buf+strlen(buf), "/%d", bits);
211    }
212    break;
213
214  case AF_LINK:
215    if (dl->sdl_nlen)
216      snprintf(buf, sizeof buf, "%.*s", dl->sdl_nlen, dl->sdl_data);
217    else if (dl->sdl_alen)
218      if (dl->sdl_type == IFT_ETHER)
219        if (dl->sdl_alen < sizeof(buf)/3) {
220          int f;
221          u_char *MAC;
222
223          MAC = (u_char *)dl->sdl_data + dl->sdl_nlen;
224          for (f = 0; f < dl->sdl_alen; f++)
225            sprintf(buf+f*3, "%02x:", MAC[f]);
226          buf[f*3-1] = '\0';
227        } else
228          sprintf(buf, "??:??:??:??:??:??");
229      else
230        sprintf(buf, "<IFT type %d>", dl->sdl_type);
231    else if (dl->sdl_slen)
232      sprintf(buf, "<slen %d?>", dl->sdl_slen);
233    else
234      sprintf(buf, "link#%d", dl->sdl_index);
235    break;
236
237  default:
238    sprintf(buf, "<AF type %d>", phost->sa_family);
239    break;
240  }
241
242  fprintf(VarTerm, "%-*s ", width-1, buf);
243}
244
245struct bits {
246  u_long b_mask;
247  char b_val;
248} bits[] = {
249
250  { RTF_UP, 'U' },
251  { RTF_GATEWAY, 'G' },
252  { RTF_HOST, 'H' },
253  { RTF_REJECT, 'R' },
254  { RTF_DYNAMIC, 'D' },
255  { RTF_MODIFIED, 'M' },
256  { RTF_DONE, 'd' },
257  { RTF_CLONING, 'C' },
258  { RTF_XRESOLVE, 'X' },
259  { RTF_LLINFO, 'L' },
260  { RTF_STATIC, 'S' },
261  { RTF_PROTO1, '1' },
262  { RTF_PROTO2, '2' },
263  { RTF_BLACKHOLE, 'B' },
264#ifdef __FreeBSD__
265  { RTF_WASCLONED, 'W' },
266  { RTF_PRCLONING, 'c' },
267  { RTF_PROTO3, '3' },
268  { RTF_BROADCAST, 'b' },
269#endif
270  { 0, '\0' }
271};
272
273static void
274p_flags(u_long f, const char *format)
275{
276  if (VarTerm) {
277    char name[33], *flags;
278    register struct bits *p = bits;
279
280    for (flags = name; p->b_mask; p++)
281      if (p->b_mask & f)
282	*flags++ = p->b_val;
283    *flags = '\0';
284    fprintf(VarTerm, format, name);
285  }
286}
287
288static const char *
289Index2Nam(int idx)
290{
291  static char ifs[200][6];	/* We could have 256 tun devices ! */
292  static int nifs, debug_done;
293
294  if (!nifs) {
295    int mib[6], needed, len;
296    char *buf, *ptr, *end;
297    struct sockaddr_dl *dl;
298    struct if_msghdr *ifm;
299
300    mib[0] = CTL_NET;
301    mib[1] = PF_ROUTE;
302    mib[2] = 0;
303    mib[3] = 0;
304    mib[4] = NET_RT_IFLIST;
305    mib[5] = 0;
306
307    if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
308      LogPrintf(LogERROR, "Index2Nam: sysctl: estimate: %s\n", strerror(errno));
309      return "???";
310    }
311    if ((buf = malloc(needed)) == NULL)
312      return "???";
313    if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
314      free(buf);
315      return "???";
316    }
317    end = buf + needed;
318
319    for (ptr = buf; ptr < end; ptr += ifm->ifm_msglen) {
320      ifm = (struct if_msghdr *)ptr;
321      dl = (struct sockaddr_dl *)(ifm + 1);
322      if (ifm->ifm_index > 0 && ifm->ifm_index <= sizeof(ifs)/sizeof(ifs[0])
323          && ifs[ifm->ifm_index-1][0] == '\0') {
324        if ((len = dl->sdl_nlen) > sizeof(ifs[0])-1)
325          len = sizeof(ifs[0])-1;
326        strncpy(ifs[ifm->ifm_index-1], dl->sdl_data, len);
327        ifs[ifm->ifm_index-1][len] = '\0';
328        if (len && nifs < ifm->ifm_index)
329          nifs = ifm->ifm_index;
330      } else if (LogIsKept(LogDEBUG))
331        LogPrintf(LogDEBUG, "Skipping out-of-range interface %d!\n",
332                  ifm->ifm_index);
333    }
334    free(buf);
335  }
336
337  if (LogIsKept(LogDEBUG) && !debug_done) {
338    int f;
339
340    LogPrintf(LogDEBUG, "Found the following interfaces:\n");
341    for (f = 0; f < nifs; f++)
342      if (*ifs[f] != '\0')
343        LogPrintf(LogDEBUG, " Index %d, name \"%s\"\n", f+1, ifs[f]);
344    debug_done = 1;
345  }
346
347  if (idx < 1 || idx > nifs || ifs[idx-1][0] == '\0')
348    return "???";
349
350  return ifs[idx-1];
351}
352
353int
354ShowRoute(struct cmdargs const *arg)
355{
356  struct rt_msghdr *rtm;
357  struct sockaddr *sa_dst, *sa_gw, *sa_mask;
358  char *sp, *ep, *cp, *wp;
359  int needed;
360  int mib[6];
361
362  if (!VarTerm)
363    return 1;
364
365  mib[0] = CTL_NET;
366  mib[1] = PF_ROUTE;
367  mib[2] = 0;
368  mib[3] = 0;
369  mib[4] = NET_RT_DUMP;
370  mib[5] = 0;
371  if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
372    LogPrintf(LogERROR, "ShowRoute: sysctl: estimate: %s\n", strerror(errno));
373    return (1);
374  }
375  if (needed < 0)
376    return (1);
377  sp = malloc(needed);
378  if (sp == NULL)
379    return (1);
380  if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
381    LogPrintf(LogERROR, "ShowRoute: sysctl: getroute: %s\n", strerror(errno));
382    free(sp);
383    return (1);
384  }
385  ep = sp + needed;
386
387  fprintf(VarTerm, "%-20s%-20sFlags  Netif\n", "Destination", "Gateway");
388  for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
389    rtm = (struct rt_msghdr *) cp;
390    wp = (char *)(rtm+1);
391
392    if (rtm->rtm_addrs & RTA_DST) {
393      sa_dst = (struct sockaddr *)wp;
394      wp += sa_dst->sa_len;
395    } else
396      sa_dst = NULL;
397
398    if (rtm->rtm_addrs & RTA_GATEWAY) {
399      sa_gw = (struct sockaddr *)wp;
400      wp += sa_gw->sa_len;
401    } else
402      sa_gw = NULL;
403
404    if (rtm->rtm_addrs & RTA_NETMASK) {
405      sa_mask = (struct sockaddr *)wp;
406      wp += sa_mask->sa_len;
407    } else
408      sa_mask = NULL;
409
410    p_sockaddr(sa_dst, sa_mask, 20);
411    p_sockaddr(sa_gw, NULL, 20);
412
413    p_flags(rtm->rtm_flags, "%-6.6s ");
414    fprintf(VarTerm, "%s\n", Index2Nam(rtm->rtm_index));
415  }
416  free(sp);
417  return 0;
418}
419
420/*
421 *  Delete routes associated with our interface
422 */
423void
424DeleteIfRoutes(int all)
425{
426  struct rt_msghdr *rtm;
427  struct sockaddr *sa;
428  struct in_addr sa_dst, sa_none;
429  int needed;
430  char *sp, *cp, *ep;
431  int mib[6];
432
433  LogPrintf(LogDEBUG, "DeleteIfRoutes (%d)\n", IfIndex);
434  sa_none.s_addr = INADDR_ANY;
435
436  mib[0] = CTL_NET;
437  mib[1] = PF_ROUTE;
438  mib[2] = 0;
439  mib[3] = 0;
440  mib[4] = NET_RT_DUMP;
441  mib[5] = 0;
442  if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
443    LogPrintf(LogERROR, "DeleteIfRoutes: sysctl: estimate: %s\n",
444	      strerror(errno));
445    return;
446  }
447  if (needed < 0)
448    return;
449
450  sp = malloc(needed);
451  if (sp == NULL)
452    return;
453
454  if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
455    LogPrintf(LogERROR, "DeleteIfRoutes: sysctl: getroute: %s\n",
456	      strerror(errno));
457    free(sp);
458    return;
459  }
460  ep = sp + needed;
461
462  for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
463    rtm = (struct rt_msghdr *) cp;
464    sa = (struct sockaddr *) (rtm + 1);
465    LogPrintf(LogDEBUG, "DeleteIfRoutes: addrs: %x, Netif: %d (%s), flags: %x,"
466	      " dst: %s ?\n", rtm->rtm_addrs, rtm->rtm_index,
467              Index2Nam(rtm->rtm_index), rtm->rtm_flags,
468	      inet_ntoa(((struct sockaddr_in *) sa)->sin_addr));
469    if (rtm->rtm_addrs & RTA_DST && rtm->rtm_addrs & RTA_GATEWAY &&
470	rtm->rtm_index == IfIndex &&
471	(all || (rtm->rtm_flags & RTF_GATEWAY))) {
472      sa_dst.s_addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
473      sa = (struct sockaddr *)((char *)sa + sa->sa_len);
474      if (sa->sa_family == AF_INET || sa->sa_family == AF_LINK) {
475        LogPrintf(LogDEBUG, "DeleteIfRoutes: Remove it\n");
476        LogPrintf(LogDEBUG, "DeleteIfRoutes: Dst: %s\n", inet_ntoa(sa_dst));
477        OsSetRoute(RTM_DELETE, sa_dst, sa_none, sa_none);
478      } else
479        LogPrintf(LogDEBUG,
480                  "DeleteIfRoutes: Can't remove routes of %d family !\n",
481                  sa->sa_family);
482    }
483  }
484  free(sp);
485}
486
487int
488GetIfIndex(char *name)
489{
490  int idx;
491  const char *got;
492
493  idx = 1;
494  while (strcmp(got = Index2Nam(idx), "???"))
495    if (!strcmp(got, name))
496      return IfIndex = idx;
497    else
498      idx++;
499  return -1;
500}
501
502struct in_addr
503ChooseHisAddr(const struct in_addr gw)
504{
505  struct in_addr try;
506  int f;
507
508  for (f = 0; f < DefHisChoice.nItems; f++) {
509    try = iplist_next(&DefHisChoice);
510    LogPrintf(LogDEBUG, "ChooseHisAddr: Check item %d (%s)\n",
511              f, inet_ntoa(try));
512    if (OsTrySetIpaddress(gw, try) == 0) {
513      LogPrintf(LogIPCP, "ChooseHisAddr: Selected IP address %s\n",
514                inet_ntoa(try));
515      break;
516    }
517  }
518
519  if (f == DefHisChoice.nItems) {
520    LogPrintf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n");
521    try.s_addr = INADDR_ANY;
522  }
523
524  return try;
525}
526