Options for DNS Configuration) into rtadvd(8) and rtsold(8). DNS information received by rtsold(8) will go to resolv.conf(5) by resolvconf(8) script. This is based on work by J.R. Oldroyd (kern/156259) but revised extensively[1]. - rtadvd(8) now supports "noifprefix" to disable gathering on-link prefixes from interfaces when no "addr" is specified[2]. An entry in rtadvd.conf with "noifprefix" + no "addr" generates an RA message with no prefix information option. - rtadvd(8) now supports RTM_IFANNOUNCE message to fix crashes when an interface is added or removed. - Correct bogus ND_OPT_ROUTE_INFO value to one in RFC 4191. Reviewed by: bz[1] PR: kern/156259 [1] PR: bin/152458 [2]
491 lines
14 KiB
C
491 lines
14 KiB
C
/* $FreeBSD$ */
|
|
/* $KAME: rrenum.c,v 1.12 2002/06/10 19:59:47 itojun Exp $ */
|
|
|
|
/*
|
|
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the project nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
#include <sys/types.h>
|
|
#include <sys/param.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_var.h>
|
|
#include <net/route.h>
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_var.h>
|
|
#include <netinet/icmp6.h>
|
|
|
|
#include <arpa/inet.h>
|
|
|
|
#include <errno.h>
|
|
#include <netdb.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <syslog.h>
|
|
#include "rtadvd.h"
|
|
#include "rrenum.h"
|
|
#include "if.h"
|
|
|
|
#define RR_ISSET_SEGNUM(segnum_bits, segnum) \
|
|
((((segnum_bits)[(segnum) >> 5]) & (1 << ((segnum) & 31))) != 0)
|
|
#define RR_SET_SEGNUM(segnum_bits, segnum) \
|
|
(((segnum_bits)[(segnum) >> 5]) |= (1 << ((segnum) & 31)))
|
|
|
|
struct rr_operation {
|
|
u_long rro_seqnum;
|
|
u_long rro_segnum_bits[8];
|
|
};
|
|
|
|
static struct rr_operation rro;
|
|
static int rr_rcvifindex;
|
|
static int rrcmd2pco[RPM_PCO_MAX] = {
|
|
0,
|
|
SIOCAIFPREFIX_IN6,
|
|
SIOCCIFPREFIX_IN6,
|
|
SIOCSGIFPREFIX_IN6
|
|
};
|
|
static int s = -1;
|
|
|
|
/*
|
|
* Check validity of a Prefix Control Operation(PCO).
|
|
* return 0 on success, 1 on failure.
|
|
*/
|
|
static int
|
|
rr_pco_check(int len, struct rr_pco_match *rpm)
|
|
{
|
|
struct rr_pco_use *rpu, *rpulim;
|
|
int checklen;
|
|
|
|
/* rpm->rpm_len must be (4N * 3) as router-renum-05.txt */
|
|
if ((rpm->rpm_len - 3) < 0 || /* must be at least 3 */
|
|
(rpm->rpm_len - 3) & 0x3) { /* must be multiple of 4 */
|
|
syslog(LOG_WARNING, "<%s> rpm_len %d is not 4N * 3",
|
|
__func__, rpm->rpm_len);
|
|
return (1);
|
|
}
|
|
/* rpm->rpm_code must be valid value */
|
|
switch (rpm->rpm_code) {
|
|
case RPM_PCO_ADD:
|
|
case RPM_PCO_CHANGE:
|
|
case RPM_PCO_SETGLOBAL:
|
|
break;
|
|
default:
|
|
syslog(LOG_WARNING, "<%s> unknown rpm_code %d", __func__,
|
|
rpm->rpm_code);
|
|
return (1);
|
|
}
|
|
/* rpm->rpm_matchlen must be 0 to 128 inclusive */
|
|
if (rpm->rpm_matchlen > 128) {
|
|
syslog(LOG_WARNING, "<%s> rpm_matchlen %d is over 128",
|
|
__func__, rpm->rpm_matchlen);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* rpu->rpu_uselen, rpu->rpu_keeplen, and sum of them must be
|
|
* between 0 and 128 inclusive
|
|
*/
|
|
for (rpu = (struct rr_pco_use *)(rpm + 1),
|
|
rpulim = (struct rr_pco_use *)((char *)rpm + len);
|
|
rpu < rpulim;
|
|
rpu += 1) {
|
|
checklen = rpu->rpu_uselen;
|
|
checklen += rpu->rpu_keeplen;
|
|
/*
|
|
* omit these check, because either of rpu_uselen
|
|
* and rpu_keeplen is unsigned char
|
|
* (128 > rpu_uselen > 0)
|
|
* (128 > rpu_keeplen > 0)
|
|
* (rpu_uselen + rpu_keeplen > 0)
|
|
*/
|
|
if (checklen > 128) {
|
|
syslog(LOG_WARNING, "<%s> sum of rpu_uselen %d and"
|
|
" rpu_keeplen %d is %d(over 128)",
|
|
__func__, rpu->rpu_uselen, rpu->rpu_keeplen,
|
|
rpu->rpu_uselen + rpu->rpu_keeplen);
|
|
return (1);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
do_use_prefix(int len, struct rr_pco_match *rpm,
|
|
struct in6_rrenumreq *irr, int ifindex)
|
|
{
|
|
struct rr_pco_use *rpu, *rpulim;
|
|
struct rainfo *rai;
|
|
struct prefix *pfx;
|
|
|
|
rpu = (struct rr_pco_use *)(rpm + 1);
|
|
rpulim = (struct rr_pco_use *)((char *)rpm + len);
|
|
|
|
if (rpu == rpulim) { /* no use prefix */
|
|
if (rpm->rpm_code == RPM_PCO_ADD)
|
|
return;
|
|
|
|
irr->irr_u_uselen = 0;
|
|
irr->irr_u_keeplen = 0;
|
|
irr->irr_raf_mask_onlink = 0;
|
|
irr->irr_raf_mask_auto = 0;
|
|
irr->irr_vltime = 0;
|
|
irr->irr_pltime = 0;
|
|
memset(&irr->irr_flags, 0, sizeof(irr->irr_flags));
|
|
irr->irr_useprefix.sin6_len = 0; /* let it mean, no addition */
|
|
irr->irr_useprefix.sin6_family = 0;
|
|
irr->irr_useprefix.sin6_addr = in6addr_any;
|
|
if (ioctl(s, rrcmd2pco[rpm->rpm_code], (caddr_t)irr) < 0 &&
|
|
errno != EADDRNOTAVAIL)
|
|
syslog(LOG_ERR, "<%s> ioctl: %s", __func__,
|
|
strerror(errno));
|
|
return;
|
|
}
|
|
|
|
for (rpu = (struct rr_pco_use *)(rpm + 1),
|
|
rpulim = (struct rr_pco_use *)((char *)rpm + len);
|
|
rpu < rpulim;
|
|
rpu += 1) {
|
|
/* init in6_rrenumreq fields */
|
|
irr->irr_u_uselen = rpu->rpu_uselen;
|
|
irr->irr_u_keeplen = rpu->rpu_keeplen;
|
|
irr->irr_raf_mask_onlink =
|
|
!!(rpu->rpu_ramask & ICMP6_RR_PCOUSE_RAFLAGS_ONLINK);
|
|
irr->irr_raf_mask_auto =
|
|
!!(rpu->rpu_ramask & ICMP6_RR_PCOUSE_RAFLAGS_AUTO);
|
|
irr->irr_vltime = ntohl(rpu->rpu_vltime);
|
|
irr->irr_pltime = ntohl(rpu->rpu_pltime);
|
|
irr->irr_raf_onlink =
|
|
(rpu->rpu_raflags & ICMP6_RR_PCOUSE_RAFLAGS_ONLINK) == 0 ?
|
|
0 : 1;
|
|
irr->irr_raf_auto =
|
|
(rpu->rpu_raflags & ICMP6_RR_PCOUSE_RAFLAGS_AUTO) == 0 ?
|
|
0 : 1;
|
|
irr->irr_rrf_decrvalid =
|
|
(rpu->rpu_flags & ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME) == 0 ?
|
|
0 : 1;
|
|
irr->irr_rrf_decrprefd =
|
|
(rpu->rpu_flags & ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME) == 0 ?
|
|
0 : 1;
|
|
irr->irr_useprefix.sin6_len = sizeof(irr->irr_useprefix);
|
|
irr->irr_useprefix.sin6_family = AF_INET6;
|
|
irr->irr_useprefix.sin6_addr = rpu->rpu_prefix;
|
|
|
|
if (ioctl(s, rrcmd2pco[rpm->rpm_code], (caddr_t)irr) < 0 &&
|
|
errno != EADDRNOTAVAIL)
|
|
syslog(LOG_ERR, "<%s> ioctl: %s", __func__,
|
|
strerror(errno));
|
|
|
|
/* very adhoc: should be rewritten */
|
|
if (rpm->rpm_code == RPM_PCO_CHANGE &&
|
|
IN6_ARE_ADDR_EQUAL(&rpm->rpm_prefix, &rpu->rpu_prefix) &&
|
|
rpm->rpm_matchlen == rpu->rpu_uselen &&
|
|
rpu->rpu_uselen == rpu->rpu_keeplen) {
|
|
if ((rai = if_indextorainfo(ifindex)) == NULL)
|
|
continue; /* non-advertising IF */
|
|
|
|
TAILQ_FOREACH(pfx, &rai->rai_prefix, pfx_next) {
|
|
struct timeval now;
|
|
|
|
if (prefix_match(&pfx->pfx_prefix,
|
|
pfx->pfx_prefixlen, &rpm->rpm_prefix,
|
|
rpm->rpm_matchlen)) {
|
|
/* change parameters */
|
|
pfx->pfx_validlifetime =
|
|
ntohl(rpu->rpu_vltime);
|
|
pfx->pfx_preflifetime =
|
|
ntohl(rpu->rpu_pltime);
|
|
if (irr->irr_rrf_decrvalid) {
|
|
gettimeofday(&now, 0);
|
|
pfx->pfx_vltimeexpire =
|
|
now.tv_sec +
|
|
pfx->pfx_validlifetime;
|
|
} else
|
|
pfx->pfx_vltimeexpire = 0;
|
|
if (irr->irr_rrf_decrprefd) {
|
|
gettimeofday(&now, 0);
|
|
pfx->pfx_pltimeexpire =
|
|
now.tv_sec +
|
|
pfx->pfx_preflifetime;
|
|
} else
|
|
pfx->pfx_pltimeexpire = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* process a Prefix Control Operation(PCO).
|
|
* return 0 on success, 1 on failure
|
|
*/
|
|
static int
|
|
do_pco(struct icmp6_router_renum *rr, int len, struct rr_pco_match *rpm)
|
|
{
|
|
int ifindex = 0;
|
|
struct in6_rrenumreq irr;
|
|
|
|
if ((rr_pco_check(len, rpm) != 0))
|
|
return (1);
|
|
|
|
if (s == -1 && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
|
|
syslog(LOG_ERR, "<%s> socket: %s", __func__,
|
|
strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
memset(&irr, 0, sizeof(irr));
|
|
irr.irr_origin = PR_ORIG_RR;
|
|
irr.irr_m_len = rpm->rpm_matchlen;
|
|
irr.irr_m_minlen = rpm->rpm_minlen;
|
|
irr.irr_m_maxlen = rpm->rpm_maxlen;
|
|
irr.irr_matchprefix.sin6_len = sizeof(irr.irr_matchprefix);
|
|
irr.irr_matchprefix.sin6_family = AF_INET6;
|
|
irr.irr_matchprefix.sin6_addr = rpm->rpm_prefix;
|
|
|
|
while (if_indextoname(++ifindex, irr.irr_name)) {
|
|
/*
|
|
* if ICMP6_RR_FLAGS_FORCEAPPLY(A flag) is 0 and
|
|
* IFF_UP is off, the interface is not applied
|
|
*/
|
|
if ((rr->rr_flags & ICMP6_RR_FLAGS_FORCEAPPLY) == 0 &&
|
|
(iflist[ifindex]->ifm_flags & IFF_UP) == 0)
|
|
continue;
|
|
/* TODO: interface scope check */
|
|
do_use_prefix(len, rpm, &irr, ifindex);
|
|
}
|
|
if (errno == ENXIO)
|
|
return (0);
|
|
else if (errno) {
|
|
syslog(LOG_ERR, "<%s> if_indextoname: %s", __func__,
|
|
strerror(errno));
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* call do_pco() for each Prefix Control Operations(PCOs) in a received
|
|
* Router Renumbering Command packet.
|
|
* return 0 on success, 1 on failure
|
|
*/
|
|
static int
|
|
do_rr(int len, struct icmp6_router_renum *rr)
|
|
{
|
|
struct rr_pco_match *rpm;
|
|
char *cp, *lim;
|
|
|
|
lim = (char *)rr + len;
|
|
cp = (char *)(rr + 1);
|
|
len -= sizeof(struct icmp6_router_renum);
|
|
|
|
/* get iflist block from kernel again, to get up-to-date information */
|
|
init_iflist();
|
|
|
|
while (cp < lim) {
|
|
int rpmlen;
|
|
|
|
rpm = (struct rr_pco_match *)cp;
|
|
if ((size_t)len < sizeof(struct rr_pco_match)) {
|
|
tooshort:
|
|
syslog(LOG_ERR, "<%s> pkt too short. left len = %d. "
|
|
"gabage at end of pkt?", __func__, len);
|
|
return (1);
|
|
}
|
|
rpmlen = rpm->rpm_len << 3;
|
|
if (len < rpmlen)
|
|
goto tooshort;
|
|
|
|
if (do_pco(rr, rpmlen, rpm)) {
|
|
syslog(LOG_WARNING, "<%s> invalid PCO", __func__);
|
|
goto next;
|
|
}
|
|
|
|
next:
|
|
cp += rpmlen;
|
|
len -= rpmlen;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* check validity of a router renumbering command packet
|
|
* return 0 on success, 1 on failure
|
|
*/
|
|
static int
|
|
rr_command_check(int len, struct icmp6_router_renum *rr, struct in6_addr *from,
|
|
struct in6_addr *dst)
|
|
{
|
|
u_char ntopbuf[INET6_ADDRSTRLEN];
|
|
|
|
/* omit rr minimal length check. hope kernel have done it. */
|
|
/* rr_command length check */
|
|
if ((size_t)len < (sizeof(struct icmp6_router_renum) +
|
|
sizeof(struct rr_pco_match))) {
|
|
syslog(LOG_ERR, "<%s> rr_command len %d is too short",
|
|
__func__, len);
|
|
return (1);
|
|
}
|
|
|
|
/* destination check. only for multicast. omit unicast check. */
|
|
if (IN6_IS_ADDR_MULTICAST(dst) && !IN6_IS_ADDR_MC_LINKLOCAL(dst) &&
|
|
!IN6_IS_ADDR_MC_SITELOCAL(dst)) {
|
|
syslog(LOG_ERR, "<%s> dst mcast addr %s is illegal",
|
|
__func__,
|
|
inet_ntop(AF_INET6, dst, ntopbuf, sizeof(ntopbuf)));
|
|
return (1);
|
|
}
|
|
|
|
/* seqnum and segnum check */
|
|
if (rro.rro_seqnum > rr->rr_seqnum) {
|
|
syslog(LOG_WARNING,
|
|
"<%s> rcvd old seqnum %d from %s",
|
|
__func__, (u_int32_t)ntohl(rr->rr_seqnum),
|
|
inet_ntop(AF_INET6, from, ntopbuf, sizeof(ntopbuf)));
|
|
return (1);
|
|
}
|
|
if (rro.rro_seqnum == rr->rr_seqnum &&
|
|
(rr->rr_flags & ICMP6_RR_FLAGS_TEST) == 0 &&
|
|
RR_ISSET_SEGNUM(rro.rro_segnum_bits, rr->rr_segnum)) {
|
|
if ((rr->rr_flags & ICMP6_RR_FLAGS_REQRESULT) != 0)
|
|
syslog(LOG_WARNING,
|
|
"<%s> rcvd duped segnum %d from %s",
|
|
__func__, rr->rr_segnum, inet_ntop(AF_INET6, from,
|
|
ntopbuf, sizeof(ntopbuf)));
|
|
return (0);
|
|
}
|
|
|
|
/* update seqnum */
|
|
if (rro.rro_seqnum != rr->rr_seqnum) {
|
|
/* then must be "<" */
|
|
|
|
/* init rro_segnum_bits */
|
|
memset(rro.rro_segnum_bits, 0,
|
|
sizeof(rro.rro_segnum_bits));
|
|
}
|
|
rro.rro_seqnum = rr->rr_seqnum;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
rr_command_input(int len, struct icmp6_router_renum *rr,
|
|
struct in6_addr *from, struct in6_addr *dst)
|
|
{
|
|
/* rr_command validity check */
|
|
if (rr_command_check(len, rr, from, dst))
|
|
goto failed;
|
|
if ((rr->rr_flags & (ICMP6_RR_FLAGS_TEST|ICMP6_RR_FLAGS_REQRESULT)) ==
|
|
ICMP6_RR_FLAGS_TEST)
|
|
return;
|
|
|
|
/* do router renumbering */
|
|
if (do_rr(len, rr))
|
|
goto failed;
|
|
|
|
/* update segnum */
|
|
RR_SET_SEGNUM(rro.rro_segnum_bits, rr->rr_segnum);
|
|
|
|
return;
|
|
|
|
failed:
|
|
syslog(LOG_ERR, "<%s> received RR was invalid", __func__);
|
|
return;
|
|
}
|
|
|
|
void
|
|
rr_input(int len, struct icmp6_router_renum *rr, struct in6_pktinfo *pi,
|
|
struct sockaddr_in6 *from, struct in6_addr *dst)
|
|
{
|
|
u_char ntopbuf[2][INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
|
|
|
|
syslog(LOG_DEBUG,
|
|
"<%s> RR received from %s to %s on %s",
|
|
__func__,
|
|
inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf[0] ,sizeof(ntopbuf[0])),
|
|
inet_ntop(AF_INET6, &dst, ntopbuf[1], sizeof(ntopbuf[1])),
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf));
|
|
|
|
/* packet validation based on Section 4.1 of RFC2894 */
|
|
if ((size_t)len < sizeof(struct icmp6_router_renum)) {
|
|
syslog(LOG_NOTICE,
|
|
"<%s>: RR short message (size %d) from %s to %s on %s",
|
|
__func__, len,
|
|
inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf[0],
|
|
sizeof(ntopbuf[0])),
|
|
inet_ntop(AF_INET6, &dst, ntopbuf[1], sizeof(ntopbuf[1])),
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf));
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If the IPv6 destination address is neither an All Routers multicast
|
|
* address [AARCH] nor one of the receiving router's unicast addresses,
|
|
* the message MUST be discarded and SHOULD be logged to network
|
|
* management.
|
|
* We rely on the kernel input routine for unicast addresses, and thus
|
|
* check multicast destinations only.
|
|
*/
|
|
if (IN6_IS_ADDR_MULTICAST(&pi->ipi6_addr) && !IN6_ARE_ADDR_EQUAL(
|
|
&sin6_sitelocal_allrouters.sin6_addr, &pi->ipi6_addr)) {
|
|
syslog(LOG_NOTICE,
|
|
"<%s>: RR message with invalid destination (%s) "
|
|
"from %s on %s",
|
|
__func__,
|
|
inet_ntop(AF_INET6, &dst, ntopbuf[0], sizeof(ntopbuf[0])),
|
|
inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf[1],
|
|
sizeof(ntopbuf[1])),
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf));
|
|
return;
|
|
}
|
|
|
|
rr_rcvifindex = pi->ipi6_ifindex;
|
|
|
|
switch (rr->rr_code) {
|
|
case ICMP6_ROUTER_RENUMBERING_COMMAND:
|
|
rr_command_input(len, rr, &from->sin6_addr, dst);
|
|
/* TODO: send reply msg */
|
|
break;
|
|
case ICMP6_ROUTER_RENUMBERING_RESULT:
|
|
/* RESULT will be processed by rrenumd */
|
|
break;
|
|
case ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET:
|
|
/* TODO: sequence number reset */
|
|
break;
|
|
default:
|
|
syslog(LOG_ERR, "<%s> received unknown code %d",
|
|
__func__, rr->rr_code);
|
|
break;
|
|
|
|
}
|
|
|
|
return;
|
|
}
|