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freebsd/usr.sbin/ppp/route.c
Brian Somers 759c81cbad Don't mis-interpret sockaddr_in6 structures as sockaddr_in structures 
when purging routes.
2000-07-20 10:38:12 +00:00

681 lines
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/*
* PPP Routing related Module
*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1994, Internet Initiative Japan, Inc. All rights reserverd.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the Internet Initiative Japan, Inc. The name of the
* IIJ may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $FreeBSD$
*
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if_dl.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <sys/un.h>
#include <netdb.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/sysctl.h>
#include <termios.h>
#include "layer.h"
#include "defs.h"
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "iplist.h"
#include "timer.h"
#include "throughput.h"
#include "lqr.h"
#include "hdlc.h"
#include "fsm.h"
#include "lcp.h"
#include "ccp.h"
#include "link.h"
#include "slcompress.h"
#include "ipcp.h"
#include "filter.h"
#include "descriptor.h"
#include "mp.h"
#ifndef NORADIUS
#include "radius.h"
#endif
#include "bundle.h"
#include "route.h"
#include "prompt.h"
#include "iface.h"
static void
p_sockaddr(struct prompt *prompt, struct sockaddr *phost,
struct sockaddr *pmask, int width)
{
char buf[29];
struct sockaddr_in *ihost4 = (struct sockaddr_in *)phost;
struct sockaddr_in *mask4 = (struct sockaddr_in *)pmask;
struct sockaddr_dl *dl = (struct sockaddr_dl *)phost;
if (log_IsKept(LogDEBUG)) {
char tmp[50];
log_Printf(LogDEBUG, "Found the following sockaddr:\n");
log_Printf(LogDEBUG, " Family %d, len %d\n",
(int)phost->sa_family, (int)phost->sa_len);
inet_ntop(phost->sa_family, phost->sa_data, tmp, sizeof tmp);
log_Printf(LogDEBUG, " Addr %s\n", tmp);
if (pmask) {
inet_ntop(pmask->sa_family, pmask->sa_data, tmp, sizeof tmp);
log_Printf(LogDEBUG, " Mask %s\n", tmp);
}
}
switch (phost->sa_family) {
case AF_INET:
if (!phost)
buf[0] = '\0';
else if (ihost4->sin_addr.s_addr == INADDR_ANY)
strcpy(buf, "default");
else if (!pmask)
strcpy(buf, inet_ntoa(ihost4->sin_addr));
else {
u_int32_t msk = ntohl(mask4->sin_addr.s_addr);
u_int32_t tst;
int bits;
int len;
struct sockaddr_in net;
for (tst = 1, bits = 32; tst; tst <<= 1, bits--)
if (msk & tst)
break;
for (tst <<= 1; tst; tst <<= 1)
if (!(msk & tst))
break;
net.sin_addr.s_addr = ihost4->sin_addr.s_addr & mask4->sin_addr.s_addr;
strcpy(buf, inet_ntoa(net.sin_addr));
for (len = strlen(buf); len > 3; buf[len -= 2] = '\0')
if (strcmp(buf + len - 2, ".0"))
break;
if (tst) /* non-contiguous :-( */
sprintf(buf + strlen(buf),"&0x%08lx", (u_long)msk);
else
sprintf(buf + strlen(buf), "/%d", bits);
}
break;
case AF_LINK:
if (dl->sdl_nlen)
snprintf(buf, sizeof buf, "%.*s", dl->sdl_nlen, dl->sdl_data);
else if (dl->sdl_alen) {
if (dl->sdl_type == IFT_ETHER) {
if (dl->sdl_alen < sizeof buf / 3) {
int f;
u_char *MAC;
MAC = (u_char *)dl->sdl_data + dl->sdl_nlen;
for (f = 0; f < dl->sdl_alen; f++)
sprintf(buf+f*3, "%02x:", MAC[f]);
buf[f*3-1] = '\0';
} else
strcpy(buf, "??:??:??:??:??:??");
} else
sprintf(buf, "<IFT type %d>", dl->sdl_type);
} else if (dl->sdl_slen)
sprintf(buf, "<slen %d?>", dl->sdl_slen);
else
sprintf(buf, "link#%d", dl->sdl_index);
break;
#ifndef NOINET6
case AF_INET6:
if (!phost)
buf[0] = '\0';
else {
const u_char masks[] = { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe };
struct sockaddr_in6 *ihost6 = (struct sockaddr_in6 *)phost;
struct sockaddr_in6 *mask6 = (struct sockaddr_in6 *)pmask;
int masklen, len;
const u_char *c;
/* XXX: ?????!?!?!!!!! This is horrible ! */
if (IN6_IS_ADDR_LINKLOCAL(&ihost6->sin6_addr) ||
IN6_IS_ADDR_MC_LINKLOCAL(&ihost6->sin6_addr)) {
ihost6->sin6_scope_id =
ntohs(*(u_short *)&ihost6->sin6_addr.s6_addr[2]);
*(u_short *)&ihost6->sin6_addr.s6_addr[2] = 0;
}
if (mask6) {
const u_char *p, *end;
p = (const u_char *)&mask6->sin6_addr;
end = p + 16;
for (masklen = 0, end = p + 16; p < end && *p == 0xff; p++)
masklen += 8;
if (p < end) {
for (c = masks; c < masks + sizeof masks; c++)
if (*c == *p) {
masklen += c - masks;
break;
}
}
} else
masklen = 128;
if (masklen == 0 && IN6_IS_ADDR_UNSPECIFIED(&ihost6->sin6_addr))
snprintf(buf, sizeof buf, "default");
else {
getnameinfo(phost, ihost6->sin6_len, buf, sizeof buf,
NULL, 0, NI_WITHSCOPEID | NI_NUMERICHOST);
if (mask6 && (len = strlen(buf)) < sizeof buf - 1)
snprintf(buf + len, sizeof buf - len, "/%d", masklen);
}
}
break;
#endif
default:
sprintf(buf, "<AF type %d>", phost->sa_family);
break;
}
prompt_Printf(prompt, "%-*s ", width-1, buf);
}
static struct bits {
u_int32_t b_mask;
char b_val;
} bits[] = {
{ RTF_UP, 'U' },
{ RTF_GATEWAY, 'G' },
{ RTF_HOST, 'H' },
{ RTF_REJECT, 'R' },
{ RTF_DYNAMIC, 'D' },
{ RTF_MODIFIED, 'M' },
{ RTF_DONE, 'd' },
{ RTF_CLONING, 'C' },
{ RTF_XRESOLVE, 'X' },
{ RTF_LLINFO, 'L' },
{ RTF_STATIC, 'S' },
{ RTF_PROTO1, '1' },
{ RTF_PROTO2, '2' },
{ RTF_BLACKHOLE, 'B' },
#ifdef RTF_WASCLONED
{ RTF_WASCLONED, 'W' },
#endif
#ifdef RTF_PRCLONING
{ RTF_PRCLONING, 'c' },
#endif
#ifdef RTF_PROTO3
{ RTF_PROTO3, '3' },
#endif
#ifdef RTF_BROADCAST
{ RTF_BROADCAST, 'b' },
#endif
{ 0, '\0' }
};
#ifndef RTF_WASCLONED
#define RTF_WASCLONED (0)
#endif
static void
p_flags(struct prompt *prompt, u_int32_t f, int max)
{
char name[33], *flags;
register struct bits *p = bits;
if (max > sizeof name - 1)
max = sizeof name - 1;
for (flags = name; p->b_mask && flags - name < max; p++)
if (p->b_mask & f)
*flags++ = p->b_val;
*flags = '\0';
prompt_Printf(prompt, "%-*.*s", max, max, name);
}
const char *
Index2Nam(int idx)
{
/*
* XXX: Maybe we should select() on the routing socket so that we can
* notice interfaces that come & go (PCCARD support).
* Or we could even support a signal that resets these so that
* the PCCARD insert/remove events can signal ppp.
*/
static char **ifs; /* Figure these out once */
static int nifs, debug_done; /* Figure out how many once, and debug once */
if (idx > nifs || (idx > 0 && ifs[idx-1] == NULL)) {
int mib[6], have, had;
size_t needed;
char *buf, *ptr, *end;
struct sockaddr_dl *dl;
struct if_msghdr *ifm;
if (ifs) {
free(ifs);
ifs = NULL;
nifs = 0;
}
debug_done = 0;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = 0;
mib[4] = NET_RT_IFLIST;
mib[5] = 0;
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
log_Printf(LogERROR, "Index2Nam: sysctl: estimate: %s\n",
strerror(errno));
return NumStr(idx, NULL, 0);
}
if ((buf = malloc(needed)) == NULL)
return NumStr(idx, NULL, 0);
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
free(buf);
return NumStr(idx, NULL, 0);
}
end = buf + needed;
have = 0;
for (ptr = buf; ptr < end; ptr += ifm->ifm_msglen) {
ifm = (struct if_msghdr *)ptr;
if (ifm->ifm_type != RTM_IFINFO)
continue;
dl = (struct sockaddr_dl *)(ifm + 1);
if (ifm->ifm_index > 0) {
if (ifm->ifm_index > have) {
char **newifs;
had = have;
have = ifm->ifm_index + 5;
if (had)
newifs = (char **)realloc(ifs, sizeof(char *) * have);
else
newifs = (char **)malloc(sizeof(char *) * have);
if (!newifs) {
log_Printf(LogDEBUG, "Index2Nam: %s\n", strerror(errno));
nifs = 0;
if (ifs) {
free(ifs);
ifs = NULL;
}
free(buf);
return NumStr(idx, NULL, 0);
}
ifs = newifs;
memset(ifs + had, '\0', sizeof(char *) * (have - had));
}
if (ifs[ifm->ifm_index-1] == NULL) {
ifs[ifm->ifm_index-1] = (char *)malloc(dl->sdl_nlen+1);
memcpy(ifs[ifm->ifm_index-1], dl->sdl_data, dl->sdl_nlen);
ifs[ifm->ifm_index-1][dl->sdl_nlen] = '\0';
if (nifs < ifm->ifm_index)
nifs = ifm->ifm_index;
}
} else if (log_IsKept(LogDEBUG))
log_Printf(LogDEBUG, "Skipping out-of-range interface %d!\n",
ifm->ifm_index);
}
free(buf);
}
if (log_IsKept(LogDEBUG) && !debug_done) {
int f;
log_Printf(LogDEBUG, "Found the following interfaces:\n");
for (f = 0; f < nifs; f++)
if (ifs[f] != NULL)
log_Printf(LogDEBUG, " Index %d, name \"%s\"\n", f+1, ifs[f]);
debug_done = 1;
}
if (idx < 1 || idx > nifs || ifs[idx-1] == NULL)
return NumStr(idx, NULL, 0);
return ifs[idx-1];
}
void
route_ParseHdr(struct rt_msghdr *rtm, struct sockaddr *sa[RTAX_MAX])
{
char *wp;
int rtax;
wp = (char *)(rtm + 1);
for (rtax = 0; rtax < RTAX_MAX; rtax++)
if (rtm->rtm_addrs & (1 << rtax)) {
sa[rtax] = (struct sockaddr *)wp;
wp += ROUNDUP(sa[rtax]->sa_len);
} else
sa[rtax] = NULL;
}
int
route_Show(struct cmdargs const *arg)
{
struct rt_msghdr *rtm;
struct sockaddr *sa[RTAX_MAX];
char *sp, *ep, *cp;
size_t needed;
int mib[6];
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = 0;
mib[4] = NET_RT_DUMP;
mib[5] = 0;
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
log_Printf(LogERROR, "route_Show: sysctl: estimate: %s\n", strerror(errno));
return (1);
}
sp = malloc(needed);
if (sp == NULL)
return (1);
if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
log_Printf(LogERROR, "route_Show: sysctl: getroute: %s\n", strerror(errno));
free(sp);
return (1);
}
ep = sp + needed;
prompt_Printf(arg->prompt, "%-20s%-20sFlags Netif\n",
"Destination", "Gateway");
for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)cp;
route_ParseHdr(rtm, sa);
if (sa[RTAX_DST] && sa[RTAX_GATEWAY]) {
p_sockaddr(arg->prompt, sa[RTAX_DST], sa[RTAX_NETMASK], 20);
p_sockaddr(arg->prompt, sa[RTAX_GATEWAY], NULL, 20);
p_flags(arg->prompt, rtm->rtm_flags, 6);
prompt_Printf(arg->prompt, " %s\n", Index2Nam(rtm->rtm_index));
} else
prompt_Printf(arg->prompt, "<can't parse routing entry>\n");
}
free(sp);
return 0;
}
/*
* Delete routes associated with our interface
*/
void
route_IfDelete(struct bundle *bundle, int all)
{
struct rt_msghdr *rtm;
struct sockaddr *sa[RTAX_MAX];
struct sockaddr_in **in;
struct in_addr sa_none;
int pass;
size_t needed;
char *sp, *cp, *ep;
int mib[6];
log_Printf(LogDEBUG, "route_IfDelete (%d)\n", bundle->iface->index);
sa_none.s_addr = INADDR_ANY;
in = (struct sockaddr_in **)sa;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = 0;
mib[4] = NET_RT_DUMP;
mib[5] = 0;
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
log_Printf(LogERROR, "route_IfDelete: sysctl: estimate: %s\n",
strerror(errno));
return;
}
sp = malloc(needed);
if (sp == NULL)
return;
if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
log_Printf(LogERROR, "route_IfDelete: sysctl: getroute: %s\n",
strerror(errno));
free(sp);
return;
}
ep = sp + needed;
for (pass = 0; pass < 2; pass++) {
/*
* We do 2 passes. The first deletes all cloned routes. The second
* deletes all non-cloned routes. This is done to avoid
* potential errors from trying to delete route X after route Y where
* route X was cloned from route Y (and is no longer there 'cos it
* may have gone with route Y).
*/
if (RTF_WASCLONED == 0 && pass == 0)
/* So we can't tell ! */
continue;
for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)cp;
route_ParseHdr(rtm, sa);
if (sa[RTAX_DST] && sa[RTAX_DST]->sa_family == AF_INET) {
log_Printf(LogDEBUG, "route_IfDelete: addrs: %x, Netif: %d (%s),"
" flags: %x, dst: %s ?\n", rtm->rtm_addrs, rtm->rtm_index,
Index2Nam(rtm->rtm_index), rtm->rtm_flags,
inet_ntoa(((struct sockaddr_in *)sa[RTAX_DST])->sin_addr));
if (sa[RTAX_GATEWAY] && rtm->rtm_index == bundle->iface->index &&
(all || (rtm->rtm_flags & RTF_GATEWAY))) {
if (sa[RTAX_GATEWAY]->sa_family == AF_INET ||
sa[RTAX_GATEWAY]->sa_family == AF_LINK) {
if ((pass == 0 && (rtm->rtm_flags & RTF_WASCLONED)) ||
(pass == 1 && !(rtm->rtm_flags & RTF_WASCLONED))) {
log_Printf(LogDEBUG, "route_IfDelete: Remove it (pass %d)\n",
pass);
bundle_SetRoute(bundle, RTM_DELETE, in[RTAX_DST]->sin_addr,
sa_none, sa_none, 0, 0);
} else
log_Printf(LogDEBUG, "route_IfDelete: Skip it (pass %d)\n", pass);
} else
log_Printf(LogDEBUG,
"route_IfDelete: Can't remove routes of %d family !\n",
sa[RTAX_GATEWAY]->sa_family);
}
}
}
}
free(sp);
}
int
GetIfIndex(char *name)
{
int idx;
const char *got;
idx = 1;
while (strcmp(got = Index2Nam(idx), "???"))
if (!strcmp(got, name))
return idx;
else
idx++;
return -1;
}
void
route_Change(struct bundle *bundle, struct sticky_route *r,
struct in_addr me, struct in_addr peer, struct in_addr dns[2])
{
struct in_addr none, del;
none.s_addr = INADDR_ANY;
for (; r; r = r->next) {
if ((r->type & ROUTE_DSTMYADDR) && r->dst.s_addr != me.s_addr) {
del.s_addr = r->dst.s_addr & r->mask.s_addr;
bundle_SetRoute(bundle, RTM_DELETE, del, none, none, 1, 0);
r->dst = me;
if (r->type & ROUTE_GWHISADDR)
r->gw = peer;
} else if ((r->type & ROUTE_DSTHISADDR) && r->dst.s_addr != peer.s_addr) {
del.s_addr = r->dst.s_addr & r->mask.s_addr;
bundle_SetRoute(bundle, RTM_DELETE, del, none, none, 1, 0);
r->dst = peer;
if (r->type & ROUTE_GWHISADDR)
r->gw = peer;
} else if ((r->type & ROUTE_DSTDNS0) && r->dst.s_addr != peer.s_addr) {
del.s_addr = r->dst.s_addr & r->mask.s_addr;
bundle_SetRoute(bundle, RTM_DELETE, del, none, none, 1, 0);
r->dst = dns[0];
if (r->type & ROUTE_GWHISADDR)
r->gw = peer;
} else if ((r->type & ROUTE_DSTDNS1) && r->dst.s_addr != peer.s_addr) {
del.s_addr = r->dst.s_addr & r->mask.s_addr;
bundle_SetRoute(bundle, RTM_DELETE, del, none, none, 1, 0);
r->dst = dns[1];
if (r->type & ROUTE_GWHISADDR)
r->gw = peer;
} else if ((r->type & ROUTE_GWHISADDR) && r->gw.s_addr != peer.s_addr)
r->gw = peer;
bundle_SetRoute(bundle, RTM_ADD, r->dst, r->gw, r->mask, 1, 0);
}
}
void
route_Clean(struct bundle *bundle, struct sticky_route *r)
{
struct in_addr none, del;
none.s_addr = INADDR_ANY;
for (; r; r = r->next) {
del.s_addr = r->dst.s_addr & r->mask.s_addr;
bundle_SetRoute(bundle, RTM_DELETE, del, none, none, 1, 0);
}
}
void
route_Add(struct sticky_route **rp, int type, struct in_addr dst,
struct in_addr mask, struct in_addr gw)
{
struct sticky_route *r;
int dsttype = type & ROUTE_DSTANY;
r = NULL;
while (*rp) {
if ((dsttype && dsttype == ((*rp)->type & ROUTE_DSTANY)) ||
(!dsttype && (*rp)->dst.s_addr == dst.s_addr)) {
/* Oops, we already have this route - unlink it */
free(r); /* impossible really */
r = *rp;
*rp = r->next;
} else
rp = &(*rp)->next;
}
if (!r)
r = (struct sticky_route *)malloc(sizeof(struct sticky_route));
r->type = type;
r->next = NULL;
r->dst = dst;
r->mask = mask;
r->gw = gw;
*rp = r;
}
void
route_Delete(struct sticky_route **rp, int type, struct in_addr dst)
{
struct sticky_route *r;
int dsttype = type & ROUTE_DSTANY;
for (; *rp; rp = &(*rp)->next) {
if ((dsttype && dsttype == ((*rp)->type & ROUTE_DSTANY)) ||
(!dsttype && dst.s_addr == ((*rp)->dst.s_addr & (*rp)->mask.s_addr))) {
r = *rp;
*rp = r->next;
free(r);
break;
}
}
}
void
route_DeleteAll(struct sticky_route **rp)
{
struct sticky_route *r, *rn;
for (r = *rp; r; r = rn) {
rn = r->next;
free(r);
}
*rp = NULL;
}
void
route_ShowSticky(struct prompt *p, struct sticky_route *r, const char *tag,
int indent)
{
int def;
int tlen = strlen(tag);
if (tlen + 2 > indent)
prompt_Printf(p, "%s:\n%*s", tag, indent, "");
else
prompt_Printf(p, "%s:%*s", tag, indent - tlen - 1, "");
for (; r; r = r->next) {
def = r->dst.s_addr == INADDR_ANY && r->mask.s_addr == INADDR_ANY;
prompt_Printf(p, "%*sadd ", tlen ? 0 : indent, "");
tlen = 0;
if (r->type & ROUTE_DSTMYADDR)
prompt_Printf(p, "MYADDR");
else if (r->type & ROUTE_DSTHISADDR)
prompt_Printf(p, "HISADDR");
else if (r->type & ROUTE_DSTDNS0)
prompt_Printf(p, "DNS0");
else if (r->type & ROUTE_DSTDNS1)
prompt_Printf(p, "DNS1");
else if (!def)
prompt_Printf(p, "%s", inet_ntoa(r->dst));
if (def)
prompt_Printf(p, "default ");
else
prompt_Printf(p, " %s ", inet_ntoa(r->mask));
if (r->type & ROUTE_GWHISADDR)
prompt_Printf(p, "HISADDR\n");
else
prompt_Printf(p, "%s\n", inet_ntoa(r->gw));
}
}
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