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/*
* Kernel routing table readup by getmsg(2)
* Copyright (C) 1999 Michael Handler
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include "prefix.h"
#include "log.h"
#include "if.h"
#include "zebra/rib.h"
#include <sys/stream.h>
#include <sys/tihdr.h>
/* Solaris defines these in both <netinet/in.h> and <inet/in.h>, sigh */
#ifdef SUNOS_5
#include <sys/tiuser.h>
#ifndef T_CURRENT
#define T_CURRENT MI_T_CURRENT
#endif /* T_CURRENT */
#ifndef IRE_CACHE
#define IRE_CACHE 0x0020 /* Cached Route entry */
#endif /* IRE_CACHE */
#ifndef IRE_HOST_REDIRECT
#define IRE_HOST_REDIRECT 0x0200 /* Host route entry from redirects */
#endif /* IRE_HOST_REDIRECT */
#ifndef IRE_CACHETABLE
#define IRE_CACHETABLE (IRE_CACHE | IRE_BROADCAST | IRE_LOCAL | \
IRE_LOOPBACK)
#endif /* IRE_CACHETABLE */
#undef IPOPT_EOL
#undef IPOPT_NOP
#undef IPOPT_LSRR
#undef IPOPT_RR
#undef IPOPT_SSRR
#endif /* SUNOS_5 */
#include <inet/common.h>
#include <inet/ip.h>
#include <inet/mib2.h>
/* device to read IP routing table from */
#ifndef _PATH_GETMSG_ROUTE
#define _PATH_GETMSG_ROUTE "/dev/ip"
#endif /* _PATH_GETMSG_ROUTE */
#define RT_BUFSIZ 8192
void handle_route_entry (mib2_ipRouteEntry_t *routeEntry)
{
struct prefix_ipv4 prefix;
struct in_addr tmpaddr, gateway;
u_char zebra_flags = 0;
if (routeEntry->ipRouteInfo.re_ire_type & IRE_CACHETABLE)
return;
if (routeEntry->ipRouteInfo.re_ire_type & IRE_HOST_REDIRECT)
zebra_flags |= ZEBRA_FLAG_SELFROUTE;
prefix.family = AF_INET;
tmpaddr.s_addr = routeEntry->ipRouteDest;
prefix.prefix = tmpaddr;
tmpaddr.s_addr = routeEntry->ipRouteMask;
prefix.prefixlen = ip_masklen (tmpaddr);
gateway.s_addr = routeEntry->ipRouteNextHop;
rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, zebra_flags, &prefix,
&gateway, 0, 0, 0, 0);
}
void route_read ()
{
char storage[RT_BUFSIZ];
struct T_optmgmt_req *TLIreq = (struct T_optmgmt_req *) storage;
struct T_optmgmt_ack *TLIack = (struct T_optmgmt_ack *) storage;
struct T_error_ack *TLIerr = (struct T_error_ack *) storage;
struct opthdr *MIB2hdr;
mib2_ipRouteEntry_t *routeEntry, *lastRouteEntry;
struct strbuf msgdata;
int flags, dev, retval, process;
if ((dev = open (_PATH_GETMSG_ROUTE, O_RDWR)) == -1) {
zlog_warn ("can't open %s: %s", _PATH_GETMSG_ROUTE,
safe_strerror (errno));
return;
}
TLIreq->PRIM_type = T_OPTMGMT_REQ;
TLIreq->OPT_offset = sizeof (struct T_optmgmt_req);
TLIreq->OPT_length = sizeof (struct opthdr);
TLIreq->MGMT_flags = T_CURRENT;
MIB2hdr = (struct opthdr *) &TLIreq[1];
MIB2hdr->level = MIB2_IP;
MIB2hdr->name = 0;
MIB2hdr->len = 0;
msgdata.buf = storage;
msgdata.len = sizeof (struct T_optmgmt_req) + sizeof (struct opthdr);
flags = 0;
if (putmsg (dev, &msgdata, NULL, flags) == -1) {
zlog_warn ("putmsg failed: %s", safe_strerror (errno));
goto exit;
}
MIB2hdr = (struct opthdr *) &TLIack[1];
msgdata.maxlen = sizeof (storage);
while (1) {
flags = 0;
retval = getmsg (dev, &msgdata, NULL, &flags);
if (retval == -1) {
zlog_warn ("getmsg(ctl) failed: %s", safe_strerror (errno));
goto exit;
}
/* This is normal loop termination */
if (retval == 0 &&
msgdata.len >= sizeof (struct T_optmgmt_ack) &&
TLIack->PRIM_type == T_OPTMGMT_ACK &&
TLIack->MGMT_flags == T_SUCCESS &&
MIB2hdr->len == 0)
break;
if (msgdata.len >= sizeof (struct T_error_ack) &&
TLIerr->PRIM_type == T_ERROR_ACK) {
zlog_warn ("getmsg(ctl) returned T_ERROR_ACK: %s",
safe_strerror ((TLIerr->TLI_error == TSYSERR)
? TLIerr->UNIX_error : EPROTO));
break;
}
/* should dump more debugging info to the log statement,
like what GateD does in this instance, but not
critical yet. */
if (retval != MOREDATA ||
msgdata.len < sizeof (struct T_optmgmt_ack) ||
TLIack->PRIM_type != T_OPTMGMT_ACK ||
TLIack->MGMT_flags != T_SUCCESS) {
errno = ENOMSG;
zlog_warn ("getmsg(ctl) returned bizarreness");
break;
}
/* MIB2_IP_21 is the the pseudo-MIB2 ipRouteTable
entry, see <inet/mib2.h>. "This isn't the MIB data
you're looking for." */
process = (MIB2hdr->level == MIB2_IP &&
MIB2hdr->name == MIB2_IP_21) ? 1 : 0;
/* getmsg writes the data buffer out completely, not
to the closest smaller multiple. Unless reassembling
data structures across buffer boundaries is your idea
of a good time, set maxlen to the closest smaller
multiple of the size of the datastructure you're
retrieving. */
msgdata.maxlen = sizeof (storage) - (sizeof (storage)
% sizeof (mib2_ipRouteEntry_t));
msgdata.len = 0;
flags = 0;
do {
retval = getmsg (dev, NULL, &msgdata, &flags);
if (retval == -1) {
zlog_warn ("getmsg(data) failed: %s",
safe_strerror (errno));
goto exit;
}
if (!(retval == 0 || retval == MOREDATA)) {
zlog_warn ("getmsg(data) returned %d", retval);
goto exit;
}
if (process) {
if (msgdata.len %
sizeof (mib2_ipRouteEntry_t) != 0) {
zlog_warn ("getmsg(data) returned "
"msgdata.len = %d (%% sizeof (mib2_ipRouteEntry_t) != 0)", msgdata.len);
goto exit;
}
routeEntry = (mib2_ipRouteEntry_t *)
msgdata.buf;
lastRouteEntry = (mib2_ipRouteEntry_t *)
(msgdata.buf + msgdata.len);
do {
handle_route_entry (routeEntry);
} while (++routeEntry < lastRouteEntry);
}
} while (retval == MOREDATA);
}
exit:
close (dev);
}
|
