459 lines
12 KiB
C
459 lines
12 KiB
C
/*
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* PPP Routing related Module
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*
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* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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*
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* Copyright (C) 1994, Internet Initiative Japan, Inc. All rights reserverd.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the Internet Initiative Japan, Inc. The name of the
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* IIJ may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id: route.c,v 1.42.2.4 1998/02/02 19:32:14 brian Exp $
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*
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*/
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <net/if_types.h>
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#include <net/route.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <net/if_dl.h>
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#include <errno.h>
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#include <machine/endian.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/sysctl.h>
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#include <unistd.h>
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#include "command.h"
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#include "mbuf.h"
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#include "log.h"
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#include "loadalias.h"
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#include "defs.h"
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#include "vars.h"
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#include "id.h"
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#include "bundle.h"
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#include "iplist.h"
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#include "timer.h"
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#include "throughput.h"
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#include "hdlc.h"
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#include "link.h"
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#include "fsm.h"
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#include "ipcp.h"
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#include "route.h"
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static void
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p_sockaddr(struct sockaddr *phost, struct sockaddr *pmask, int width)
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{
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char buf[29];
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struct sockaddr_in *ihost = (struct sockaddr_in *)phost;
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struct sockaddr_in *mask = (struct sockaddr_in *)pmask;
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struct sockaddr_dl *dl = (struct sockaddr_dl *)phost;
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switch (phost->sa_family) {
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case AF_INET:
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if (!phost)
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buf[0] = '\0';
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else if (ihost->sin_addr.s_addr == INADDR_ANY)
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strcpy(buf, "default");
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else if (!mask)
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strcpy(buf, inet_ntoa(ihost->sin_addr));
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else {
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u_int msk = ntohl(mask->sin_addr.s_addr);
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u_int tst;
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int bits;
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int len;
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struct sockaddr_in net;
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for (tst = 1, bits=32; tst; tst <<= 1, bits--)
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if (msk & tst)
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break;
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for (tst <<=1; tst; tst <<= 1)
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if (!(msk & tst))
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break;
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net.sin_addr.s_addr = ihost->sin_addr.s_addr & mask->sin_addr.s_addr;
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strcpy(buf, inet_ntoa(net.sin_addr));
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for (len = strlen(buf); len > 3; buf[len-=2] = '\0')
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if (strcmp(buf+len-2, ".0"))
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break;
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if (tst) /* non-contiguous :-( */
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sprintf(buf+strlen(buf),"&0x%08x", msk);
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else
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sprintf(buf+strlen(buf), "/%d", bits);
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}
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break;
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case AF_LINK:
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if (dl->sdl_nlen)
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snprintf(buf, sizeof buf, "%.*s", dl->sdl_nlen, dl->sdl_data);
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else if (dl->sdl_alen)
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if (dl->sdl_type == IFT_ETHER)
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if (dl->sdl_alen < sizeof buf / 3) {
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int f;
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u_char *MAC;
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MAC = (u_char *)dl->sdl_data + dl->sdl_nlen;
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for (f = 0; f < dl->sdl_alen; f++)
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sprintf(buf+f*3, "%02x:", MAC[f]);
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buf[f*3-1] = '\0';
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} else
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strcpy(buf, "??:??:??:??:??:??");
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else
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sprintf(buf, "<IFT type %d>", dl->sdl_type);
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else if (dl->sdl_slen)
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sprintf(buf, "<slen %d?>", dl->sdl_slen);
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else
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sprintf(buf, "link#%d", dl->sdl_index);
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break;
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default:
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sprintf(buf, "<AF type %d>", phost->sa_family);
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break;
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}
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fprintf(VarTerm, "%-*s ", width-1, buf);
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}
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static struct bits {
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u_long b_mask;
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char b_val;
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} bits[] = {
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{ RTF_UP, 'U' },
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{ RTF_GATEWAY, 'G' },
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{ RTF_HOST, 'H' },
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{ RTF_REJECT, 'R' },
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{ RTF_DYNAMIC, 'D' },
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{ RTF_MODIFIED, 'M' },
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{ RTF_DONE, 'd' },
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{ RTF_CLONING, 'C' },
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{ RTF_XRESOLVE, 'X' },
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{ RTF_LLINFO, 'L' },
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{ RTF_STATIC, 'S' },
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{ RTF_PROTO1, '1' },
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{ RTF_PROTO2, '2' },
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{ RTF_BLACKHOLE, 'B' },
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#ifdef RTF_WASCLONED
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{ RTF_WASCLONED, 'W' },
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#endif
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#ifdef RTF_PRCLONING
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{ RTF_PRCLONING, 'c' },
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#endif
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#ifdef RTF_PROTO3
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{ RTF_PROTO3, '3' },
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#endif
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#ifdef RTF_BROADCAST
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{ RTF_BROADCAST, 'b' },
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#endif
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{ 0, '\0' }
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};
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#ifndef RTF_WASCLONED
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#define RTF_WASCLONED (0)
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#endif
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static void
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p_flags(u_long f, int max)
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{
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if (VarTerm) {
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char name[33], *flags;
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register struct bits *p = bits;
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if (max > sizeof name - 1)
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max = sizeof name - 1;
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for (flags = name; p->b_mask && flags - name < max; p++)
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if (p->b_mask & f)
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*flags++ = p->b_val;
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*flags = '\0';
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fprintf(VarTerm, "%-*.*s", max, max, name);
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}
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}
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const char *
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Index2Nam(int idx)
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{
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static char **ifs;
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static int nifs, debug_done;
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if (!nifs) {
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int mib[6], have, had;
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size_t needed;
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char *buf, *ptr, *end;
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struct sockaddr_dl *dl;
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struct if_msghdr *ifm;
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[2] = 0;
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mib[3] = 0;
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mib[4] = NET_RT_IFLIST;
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mib[5] = 0;
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if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
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LogPrintf(LogERROR, "Index2Nam: sysctl: estimate: %s\n", strerror(errno));
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return "???";
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}
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if ((buf = malloc(needed)) == NULL)
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return "???";
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if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
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free(buf);
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return "???";
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}
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end = buf + needed;
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have = 0;
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for (ptr = buf; ptr < end; ptr += ifm->ifm_msglen) {
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ifm = (struct if_msghdr *)ptr;
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dl = (struct sockaddr_dl *)(ifm + 1);
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if (ifm->ifm_index > 0) {
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if (ifm->ifm_index > have) {
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had = have;
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have = ifm->ifm_index + 5;
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if (had)
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ifs = (char **)realloc(ifs, sizeof(char *) * have);
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else
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ifs = (char **)malloc(sizeof(char *) * have);
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if (!ifs) {
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LogPrintf(LogDEBUG, "Index2Nam: %s\n", strerror(errno));
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nifs = 0;
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return "???";
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}
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memset(ifs + had, '\0', sizeof(char *) * (have - had));
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}
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if (ifs[ifm->ifm_index-1] == NULL) {
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ifs[ifm->ifm_index-1] = (char *)malloc(dl->sdl_nlen+1);
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memcpy(ifs[ifm->ifm_index-1], dl->sdl_data, dl->sdl_nlen);
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ifs[ifm->ifm_index-1][dl->sdl_nlen] = '\0';
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if (nifs < ifm->ifm_index)
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nifs = ifm->ifm_index;
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}
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} else if (LogIsKept(LogDEBUG))
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LogPrintf(LogDEBUG, "Skipping out-of-range interface %d!\n",
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ifm->ifm_index);
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}
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free(buf);
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}
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if (LogIsKept(LogDEBUG) && !debug_done) {
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int f;
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LogPrintf(LogDEBUG, "Found the following interfaces:\n");
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for (f = 0; f < nifs; f++)
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if (ifs[f] != NULL)
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LogPrintf(LogDEBUG, " Index %d, name \"%s\"\n", f+1, ifs[f]);
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debug_done = 1;
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}
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if (idx < 1 || idx > nifs || ifs[idx-1] == NULL)
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return "???";
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return ifs[idx-1];
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}
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int
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ShowRoute(struct cmdargs const *arg)
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{
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struct rt_msghdr *rtm;
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struct sockaddr *sa_dst, *sa_gw, *sa_mask;
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char *sp, *ep, *cp, *wp;
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size_t needed;
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int mib[6];
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if (!VarTerm)
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return 1;
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[2] = 0;
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mib[3] = 0;
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mib[4] = NET_RT_DUMP;
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mib[5] = 0;
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if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
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LogPrintf(LogERROR, "ShowRoute: sysctl: estimate: %s\n", strerror(errno));
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return (1);
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}
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if (needed < 0)
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return (1);
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sp = malloc(needed);
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if (sp == NULL)
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return (1);
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if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
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LogPrintf(LogERROR, "ShowRoute: sysctl: getroute: %s\n", strerror(errno));
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free(sp);
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return (1);
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}
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ep = sp + needed;
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fprintf(VarTerm, "%-20s%-20sFlags Netif\n", "Destination", "Gateway");
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for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
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rtm = (struct rt_msghdr *) cp;
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wp = (char *)(rtm+1);
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if (rtm->rtm_addrs & RTA_DST) {
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sa_dst = (struct sockaddr *)wp;
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wp += sa_dst->sa_len;
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} else
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sa_dst = NULL;
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if (rtm->rtm_addrs & RTA_GATEWAY) {
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sa_gw = (struct sockaddr *)wp;
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wp += sa_gw->sa_len;
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} else
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sa_gw = NULL;
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if (rtm->rtm_addrs & RTA_NETMASK) {
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sa_mask = (struct sockaddr *)wp;
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wp += sa_mask->sa_len;
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} else
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sa_mask = NULL;
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p_sockaddr(sa_dst, sa_mask, 20);
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p_sockaddr(sa_gw, NULL, 20);
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p_flags(rtm->rtm_flags, 6);
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fprintf(VarTerm, " %s\n", Index2Nam(rtm->rtm_index));
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}
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free(sp);
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return 0;
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}
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/*
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* Delete routes associated with our interface
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*/
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void
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DeleteIfRoutes(struct bundle *bundle, int all)
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{
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struct rt_msghdr *rtm;
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struct sockaddr *sa;
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struct in_addr sa_dst, sa_none;
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int pass;
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size_t needed;
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char *sp, *cp, *ep;
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int mib[6];
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LogPrintf(LogDEBUG, "DeleteIfRoutes (%d)\n", bundle->ifIndex);
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sa_none.s_addr = INADDR_ANY;
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[2] = 0;
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mib[3] = 0;
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mib[4] = NET_RT_DUMP;
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mib[5] = 0;
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if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
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LogPrintf(LogERROR, "DeleteIfRoutes: sysctl: estimate: %s\n",
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strerror(errno));
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return;
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}
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if (needed < 0)
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return;
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sp = malloc(needed);
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if (sp == NULL)
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return;
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if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
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LogPrintf(LogERROR, "DeleteIfRoutes: sysctl: getroute: %s\n",
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strerror(errno));
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free(sp);
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return;
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}
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ep = sp + needed;
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for (pass = 0; pass < 2; pass++) {
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/*
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* We do 2 passes. The first deletes all cloned routes. The second
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* deletes all non-cloned routes. This is necessary to avoid
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* potential errors from trying to delete route X after route Y where
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* route X was cloned from route Y (which is no longer there).
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*/
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if (RTF_WASCLONED == 0 && pass == 0)
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/* So we can't tell ! */
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continue;
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for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
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rtm = (struct rt_msghdr *) cp;
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sa = (struct sockaddr *) (rtm + 1);
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LogPrintf(LogDEBUG, "DeleteIfRoutes: addrs: %x, Netif: %d (%s),"
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" flags: %x, dst: %s ?\n", rtm->rtm_addrs, rtm->rtm_index,
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Index2Nam(rtm->rtm_index), rtm->rtm_flags,
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inet_ntoa(((struct sockaddr_in *) sa)->sin_addr));
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if (rtm->rtm_addrs & RTA_DST && rtm->rtm_addrs & RTA_GATEWAY &&
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rtm->rtm_index == bundle->ifIndex &&
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(all || (rtm->rtm_flags & RTF_GATEWAY))) {
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sa_dst.s_addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
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sa = (struct sockaddr *)((char *)sa + sa->sa_len);
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if (sa->sa_family == AF_INET || sa->sa_family == AF_LINK) {
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if ((pass == 0 && (rtm->rtm_flags & RTF_WASCLONED)) ||
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(pass == 1 && !(rtm->rtm_flags & RTF_WASCLONED))) {
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LogPrintf(LogDEBUG, "DeleteIfRoutes: Remove it (pass %d)\n", pass);
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bundle_SetRoute(bundle, RTM_DELETE, sa_dst, sa_none, sa_none, 0);
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} else
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LogPrintf(LogDEBUG, "DeleteIfRoutes: Skip it (pass %d)\n", pass);
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} else
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LogPrintf(LogDEBUG,
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"DeleteIfRoutes: Can't remove routes of %d family !\n",
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sa->sa_family);
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}
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}
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}
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free(sp);
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}
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int
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GetIfIndex(char *name)
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{
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int idx;
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const char *got;
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idx = 1;
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while (strcmp(got = Index2Nam(idx), "???"))
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if (!strcmp(got, name))
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return idx;
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else
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idx++;
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return -1;
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}
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struct in_addr
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ChooseHisAddr(struct bundle *bundle, const struct in_addr gw)
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{
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struct in_addr try;
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int f;
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for (f = 0; f < IpcpInfo.DefHisChoice.nItems; f++) {
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try = iplist_next(&IpcpInfo.DefHisChoice);
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LogPrintf(LogDEBUG, "ChooseHisAddr: Check item %d (%s)\n",
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f, inet_ntoa(try));
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if (bundle_TrySetIPaddress(bundle, gw, try) == 0) {
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LogPrintf(LogIPCP, "ChooseHisAddr: Selected IP address %s\n",
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inet_ntoa(try));
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break;
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}
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}
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if (f == IpcpInfo.DefHisChoice.nItems) {
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LogPrintf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n");
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try.s_addr = INADDR_ANY;
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}
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return try;
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}
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