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NetBSD/sys/netinet6/nd6_rtr.c

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/* $NetBSD: nd6_rtr.c,v 1.145.2.1 2020/04/14 17:26:22 martin Exp $ */
/* $KAME: nd6_rtr.c,v 1.95 2001/02/07 08:09:47 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nd6_rtr.c,v 1.145.2.1 2020/04/14 17:26:22 martin Exp $");
#ifdef _KERNEL_OPT
#include "opt_net_mpsafe.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/syslog.h>
#include <sys/cprng.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <netinet6/in6_var.h>
#include <netinet6/in6_ifattach.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <netinet/icmp6.h>
#include <netinet6/icmp6_private.h>
#include <netinet6/scope6_var.h>
static int rtpref(struct nd_defrouter *);
static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *);
static int prelist_update(struct nd_prefixctl *, struct nd_defrouter *,
struct mbuf *, int);
static struct in6_ifaddr *in6_ifadd(struct nd_prefixctl *, int, struct psref *);
static struct nd_pfxrouter *pfxrtr_lookup(struct nd_prefix *,
struct nd_defrouter *);
static void pfxrtr_add(struct nd_prefix *, struct nd_defrouter *);
static void pfxrtr_del(struct nd_pfxrouter *);
static struct nd_pfxrouter *find_pfxlist_reachable_router
(struct nd_prefix *);
static void defrouter_addreq(struct nd_defrouter *);
static void defrouter_delreq(struct nd_defrouter *);
static int in6_init_prefix_ltimes(struct nd_prefix *);
static void in6_init_address_ltimes(struct nd_prefix *,
struct in6_addrlifetime *);
static void purge_detached(struct ifnet *);
static int rt6_deleteroute_matcher(struct rtentry *, void *);
static int nd6_prelist_add(struct nd_prefixctl *, struct nd_defrouter *,
struct nd_prefix **);
static int nd6_prefix_onlink(struct nd_prefix *);
static int nd6_prefix_offlink(struct nd_prefix *);
static struct nd_prefix *nd6_prefix_lookup(struct nd_prefixctl *);
extern int nd6_recalc_reachtm_interval;
int ip6_use_tempaddr = 0;
int ip6_desync_factor;
u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME;
u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME;
int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE;
int nd6_numroutes = 0;
/* RTPREF_MEDIUM has to be 0! */
#define RTPREF_HIGH 1
#define RTPREF_MEDIUM 0
#define RTPREF_LOW (-1)
#define RTPREF_RESERVED (-2)
#define RTPREF_INVALID (-3) /* internal */
static inline bool
nd6_is_llinfo_probreach(struct nd_defrouter *dr)
{
struct llentry *ln = NULL;
ln = nd6_lookup(&dr->rtaddr, dr->ifp, false);
if (ln == NULL)
return false;
if (!ND6_IS_LLINFO_PROBREACH(ln)) {
LLE_RUNLOCK(ln);
return false;
}
LLE_RUNLOCK(ln);
return true;
}
/*
* Receive Router Solicitation Message - just for routers.
* Router solicitation/advertisement is mostly managed by a userland program
* (rtadvd) so here we have no function like nd6_ra_output().
*
* Based on RFC 2461
*/
void
nd6_rs_input(struct mbuf *m, int off, int icmp6len)
{
struct ifnet *ifp;
struct nd_ifinfo *ndi;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct nd_router_solicit *nd_rs;
struct in6_addr saddr6 = ip6->ip6_src;
char *lladdr = NULL;
int lladdrlen = 0;
union nd_opts ndopts;
struct psref psref;
char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
ifp = m_get_rcvif_psref(m, &psref);
if (ifp == NULL)
goto freeit;
ndi = ND_IFINFO(ifp);
/* If I'm not a router, ignore it. */
if (nd6_accepts_rtadv(ndi) || !ip6_forwarding)
goto freeit;
/* Sanity checks */
if (ip6->ip6_hlim != 255) {
nd6log(LOG_ERR, "invalid hlim (%d) from %s to %s on %s\n",
ip6->ip6_hlim, IN6_PRINT(ip6bufs, &ip6->ip6_src),
IN6_PRINT(ip6bufd, &ip6->ip6_dst), if_name(ifp));
goto bad;
}
/*
* Don't update the neighbor cache, if src = ::.
* This indicates that the src has no IP address assigned yet.
*/
if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
goto freeit;
IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
if (nd_rs == NULL) {
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
m_put_rcvif_psref(ifp, &psref);
return;
}
icmp6len -= sizeof(*nd_rs);
nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
if (nd6_options(&ndopts) < 0) {
nd6log(LOG_INFO, "invalid ND option, ignored\n");
/* nd6_options have incremented stats */
goto freeit;
}
if (ndopts.nd_opts_src_lladdr) {
lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
}
if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
nd6log(LOG_INFO, "lladdrlen mismatch for %s "
"(if %d, RS packet %d)\n",
IN6_PRINT(ip6bufs, &saddr6),
ifp->if_addrlen, lladdrlen - 2);
goto bad;
}
nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
freeit:
m_put_rcvif_psref(ifp, &psref);
m_freem(m);
return;
bad:
ICMP6_STATINC(ICMP6_STAT_BADRS);
m_put_rcvif_psref(ifp, &psref);
m_freem(m);
}
/*
* Receive Router Advertisement Message.
*
* Based on RFC 2461
* TODO: on-link bit on prefix information
* TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
*/
void
nd6_ra_input(struct mbuf *m, int off, int icmp6len)
{
struct ifnet *ifp;
struct nd_ifinfo *ndi;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct nd_router_advert *nd_ra;
struct in6_addr saddr6 = ip6->ip6_src;
int mcast = 0;
union nd_opts ndopts;
struct nd_defrouter *dr;
struct psref psref;
char ip6buf[INET6_ADDRSTRLEN], ip6buf2[INET6_ADDRSTRLEN];
ifp = m_get_rcvif_psref(m, &psref);
if (ifp == NULL)
goto freeit;
ndi = ND_IFINFO(ifp);
/*
* We only accept RAs when the system-wide variable allows the
* acceptance, and the per-interface variable allows RAs on the
* receiving interface.
*/
if (!nd6_accepts_rtadv(ndi))
goto freeit;
if (ip6->ip6_hlim != 255) {
nd6log(LOG_ERR, "invalid hlim (%d) from %s to %s on %s\n",
ip6->ip6_hlim, IN6_PRINT(ip6buf, &ip6->ip6_src),
IN6_PRINT(ip6buf2, &ip6->ip6_dst), if_name(ifp));
goto bad;
}
if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
nd6log(LOG_ERR, "src %s is not link-local\n",
IN6_PRINT(ip6buf, &saddr6));
goto bad;
}
IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
if (nd_ra == NULL) {
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
m_put_rcvif_psref(ifp, &psref);
return;
}
icmp6len -= sizeof(*nd_ra);
nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
if (nd6_options(&ndopts) < 0) {
nd6log(LOG_INFO, "invalid ND option, ignored\n");
/* nd6_options have incremented stats */
goto freeit;
}
{
struct nd_defrouter drtr;
u_int32_t advreachable = nd_ra->nd_ra_reachable;
/* remember if this is a multicasted advertisement */
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
mcast = 1;
memset(&drtr, 0, sizeof(drtr));
drtr.rtaddr = saddr6;
drtr.flags = nd_ra->nd_ra_flags_reserved;
drtr.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
drtr.expire = time_uptime + drtr.rtlifetime;
drtr.ifp = ifp;
/* unspecified or not? (RFC 2461 6.3.4) */
if (advreachable) {
NTOHL(advreachable);
if (advreachable <= MAX_REACHABLE_TIME &&
ndi->basereachable != advreachable) {
ndi->basereachable = advreachable;
ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */
}
}
if (nd_ra->nd_ra_retransmit)
ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
if (nd_ra->nd_ra_curhoplimit) {
if (ndi->chlim < nd_ra->nd_ra_curhoplimit)
ndi->chlim = nd_ra->nd_ra_curhoplimit;
else if (ndi->chlim != nd_ra->nd_ra_curhoplimit)
log(LOG_ERR, "nd_ra_input: lower CurHopLimit sent from "
"%s on %s (current=%d, received=%d), ignored\n",
IN6_PRINT(ip6buf, &ip6->ip6_src),
if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit);
}
IFNET_LOCK(ifp);
ND6_WLOCK();
dr = defrtrlist_update(&drtr);
}
/*
* prefix
*/
if (ndopts.nd_opts_pi) {
struct nd_opt_hdr *pt;
struct nd_opt_prefix_info *pi = NULL;
struct nd_prefixctl prc;
for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
pt = (struct nd_opt_hdr *)((char *)pt +
(pt->nd_opt_len << 3))) {
if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
continue;
pi = (struct nd_opt_prefix_info *)pt;
if (pi->nd_opt_pi_len != 4) {
nd6log(LOG_INFO, "invalid option "
"len %d for prefix information option, "
"ignored\n", pi->nd_opt_pi_len);
continue;
}
if (128 < pi->nd_opt_pi_prefix_len) {
nd6log(LOG_INFO, "invalid prefix "
"len %d for prefix information option, "
"ignored\n", pi->nd_opt_pi_prefix_len);
continue;
}
if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
|| IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
nd6log(LOG_INFO,
"invalid prefix %s, ignored\n",
IN6_PRINT(ip6buf, &pi->nd_opt_pi_prefix));
continue;
}
memset(&prc, 0, sizeof(prc));
sockaddr_in6_init(&prc.ndprc_prefix,
&pi->nd_opt_pi_prefix, 0, 0, 0);
prc.ndprc_ifp = ifp;
prc.ndprc_raf_onlink = (pi->nd_opt_pi_flags_reserved &
ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
prc.ndprc_raf_auto = (pi->nd_opt_pi_flags_reserved &
ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
prc.ndprc_plen = pi->nd_opt_pi_prefix_len;
prc.ndprc_vltime = ntohl(pi->nd_opt_pi_valid_time);
prc.ndprc_pltime = ntohl(pi->nd_opt_pi_preferred_time);
(void)prelist_update(&prc, dr, m, mcast);
}
}
ND6_UNLOCK();
IFNET_UNLOCK(ifp);
/*
* MTU
*/
if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
u_long mtu;
u_long maxmtu;
mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
/* lower bound */
if (mtu < IPV6_MMTU) {
nd6log(LOG_INFO, "bogus mtu option "
"mtu=%lu sent from %s, ignoring\n",
mtu, IN6_PRINT(ip6buf, &ip6->ip6_src));
goto skip;
}
/* upper bound */
maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
? ndi->maxmtu : ifp->if_mtu;
if (mtu <= maxmtu) {
int change = (ndi->linkmtu != mtu);
ndi->linkmtu = mtu;
if (change) /* in6_maxmtu may change */
in6_setmaxmtu();
} else {
nd6log(LOG_INFO,
"bogus mtu mtu=%lu sent from %s; "
"exceeds maxmtu %lu, ignoring\n",
mtu, IN6_PRINT(ip6buf, &ip6->ip6_src), maxmtu);
}
}
skip:
/*
* Source link layer address
*/
{
char *lladdr = NULL;
int lladdrlen = 0;
if (ndopts.nd_opts_src_lladdr) {
lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
}
if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
nd6log(LOG_INFO, "lladdrlen mismatch for %s "
"(if %d, RA packet %d)\n", IN6_PRINT(ip6buf, &saddr6),
ifp->if_addrlen, lladdrlen - 2);
goto bad;
}
nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0);
/*
* Installing a link-layer address might change the state of the
* router's neighbor cache, which might also affect our on-link
* detection of adveritsed prefixes.
*/
ND6_WLOCK();
nd6_pfxlist_onlink_check();
ND6_UNLOCK();
}
freeit:
m_put_rcvif_psref(ifp, &psref);
m_freem(m);
return;
bad:
ICMP6_STATINC(ICMP6_STAT_BADRA);
m_put_rcvif_psref(ifp, &psref);
m_freem(m);
}
/*
* default router list processing sub routines
*/
static void
defrouter_addreq(struct nd_defrouter *newdr)
{
union {
struct sockaddr_in6 sin6;
struct sockaddr sa;
} def, mask, gate;
#ifndef NET_MPSAFE
int s;
#endif
int error;
memset(&def, 0, sizeof(def));
memset(&mask, 0, sizeof(mask));
memset(&gate, 0,sizeof(gate)); /* for safety */
def.sin6.sin6_len = mask.sin6.sin6_len = gate.sin6.sin6_len =
sizeof(struct sockaddr_in6);
def.sin6.sin6_family = mask.sin6.sin6_family = gate.sin6.sin6_family = AF_INET6;
gate.sin6.sin6_addr = newdr->rtaddr;
#ifndef SCOPEDROUTING
gate.sin6.sin6_scope_id = 0; /* XXX */
#endif
#ifndef NET_MPSAFE
s = splsoftnet();
#endif
error = rtrequest_newmsg(RTM_ADD, &def.sa, &gate.sa, &mask.sa,
RTF_GATEWAY);
if (error == 0) {
nd6_numroutes++;
newdr->installed = 1;
} else {
char ip6buf[INET6_ADDRSTRLEN];
log(LOG_ERR, "defrouter_addreq: "
"error %d adding default router %s on %s\n",
error, IN6_PRINT(ip6buf, &newdr->rtaddr), newdr->ifp->if_xname);
}
#ifndef NET_MPSAFE
splx(s);
#endif
return;
}
struct nd_defrouter *
nd6_defrouter_lookup(const struct in6_addr *addr, struct ifnet *ifp)
{
struct nd_defrouter *dr;
ND6_ASSERT_LOCK();
ND_DEFROUTER_LIST_FOREACH(dr) {
if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
break;
}
return dr; /* search failed */
}
void
nd6_defrtrlist_del(struct nd_defrouter *dr, struct in6_ifextra *ext)
{
struct nd_defrouter *deldr = NULL;
struct nd_prefix *pr;
struct nd_ifinfo *ndi;
ND6_ASSERT_WLOCK();
if (ext == NULL)
ext = dr->ifp->if_afdata[AF_INET6];
/* detach already in progress, can not do anything */
if (ext == NULL)
return;
ndi = ext->nd_ifinfo;
/*
* Flush all the routing table entries that use the router
* as a next hop.
*/
/* XXX: better condition? */
if (!ip6_forwarding && nd6_accepts_rtadv(ndi))
nd6_rt_flush(&dr->rtaddr, dr->ifp);
if (dr->installed) {
deldr = dr;
defrouter_delreq(dr);
}
ND_DEFROUTER_LIST_REMOVE(dr);
/*
* Also delete all the pointers to the router in each prefix lists.
*/
ND_PREFIX_LIST_FOREACH(pr) {
struct nd_pfxrouter *pfxrtr;
if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
pfxrtr_del(pfxrtr);
}
nd6_pfxlist_onlink_check();
/*
* If the router is the primary one, choose a new one.
* Note that nd6_defrouter_select() will remove the current gateway
* from the routing table.
*/
if (deldr)
nd6_defrouter_select();
ext->ndefrouters--;
if (ext->ndefrouters < 0) {
log(LOG_WARNING, "nd6_defrtrlist_del: negative count on %s\n",
dr->ifp->if_xname);
}
free(dr, M_IP6NDP);
}
/*
* Remove the default route for a given router.
* This is just a subroutine function for nd6_defrouter_select(), and should
* not be called from anywhere else.
*/
static void
defrouter_delreq(struct nd_defrouter *dr)
{
union {
struct sockaddr_in6 sin6;
struct sockaddr sa;
} def, mask, gw;
int error;
memset(&def, 0, sizeof(def));
memset(&mask, 0, sizeof(mask));
memset(&gw, 0, sizeof(gw)); /* for safety */
def.sin6.sin6_len = mask.sin6.sin6_len = gw.sin6.sin6_len =
sizeof(struct sockaddr_in6);
def.sin6.sin6_family = mask.sin6.sin6_family = gw.sin6.sin6_family = AF_INET6;
gw.sin6.sin6_addr = dr->rtaddr;
#ifndef SCOPEDROUTING
gw.sin6.sin6_scope_id = 0; /* XXX */
#endif
error = rtrequest_newmsg(RTM_DELETE, &def.sa, &gw.sa, &mask.sa,
RTF_GATEWAY);
if (error == 0) {
nd6_numroutes--;
dr->installed = 0;
} else {
char ip6buf[INET6_ADDRSTRLEN];
log(LOG_ERR, "defrouter_delreq: "
"error %d deleting default router %s on %s\n",
error, IN6_PRINT(ip6buf, &dr->rtaddr), dr->ifp->if_xname);
}
}
/*
* remove all default routes from default router list
*/
void
nd6_defrouter_reset(void)
{
struct nd_defrouter *dr;
ND6_ASSERT_WLOCK();
ND_DEFROUTER_LIST_FOREACH(dr)
defrouter_delreq(dr);
/*
* XXX should we also nuke any default routers in the kernel, by
* going through them by rtalloc1()?
*/
}
/*
* Default Router Selection according to Section 6.3.6 of RFC 2461 and
* draft-ietf-ipngwg-router-selection:
* 1) Routers that are reachable or probably reachable should be preferred.
* If we have more than one (probably) reachable router, prefer ones
* with the highest router preference.
* 2) When no routers on the list are known to be reachable or
* probably reachable, routers SHOULD be selected in a round-robin
* fashion, regardless of router preference values.
* 3) If the Default Router List is empty, assume that all
* destinations are on-link.
*
* We assume nd_defrouter is sorted by router preference value.
* Since the code below covers both with and without router preference cases,
* we do not need to classify the cases by ifdef.
*
* At this moment, we do not try to install more than one default router,
* even when the multipath routing is available, because we're not sure about
* the benefits for stub hosts comparing to the risk of making the code
* complicated and the possibility of introducing bugs.
*/
void
nd6_defrouter_select(void)
{
struct nd_ifinfo *ndi;
struct nd_defrouter *dr, *selected_dr = NULL, *installed_dr = NULL;
ND6_ASSERT_WLOCK();
/*
* This function should be called only when acting as an autoconfigured
* host. Although the remaining part of this function is not effective
* if the node is not an autoconfigured host, we explicitly exclude
* such cases here for safety.
*/
if (ip6_forwarding) {
nd6log(LOG_WARNING, "called unexpectedly (forwarding=%d, "
"accept_rtadv=%d)\n", ip6_forwarding, ip6_accept_rtadv);
return;
}
/*
* Let's handle easy case (3) first:
* If default router list is empty, there's nothing to be done.
*/
if (ND_DEFROUTER_LIST_EMPTY())
return;
/*
* Search for a (probably) reachable router from the list.
* We just pick up the first reachable one (if any), assuming that
* the ordering rule of the list described in defrtrlist_update().
*/
ND_DEFROUTER_LIST_FOREACH(dr) {
if (dr->installed && !installed_dr)
installed_dr = dr;
else if (dr->installed && installed_dr) {
/* this should not happen. warn for diagnosis. */
log(LOG_ERR, "nd6_defrouter_select: more than one router"
" is installed\n");
}
ndi = ND_IFINFO(dr->ifp);
if (!nd6_accepts_rtadv(ndi))
continue;
if (selected_dr == NULL &&
nd6_is_llinfo_probreach(dr))
selected_dr = dr;
}
/*
* If none of the default routers was found to be reachable,
* round-robin the list regardless of preference.
* Otherwise, if we have an installed router, check if the selected
* (reachable) router should really be preferred to the installed one.
* We only prefer the new router when the old one is not reachable
* or when the new one has a really higher preference value.
*/
if (selected_dr == NULL) {
if (installed_dr == NULL ||
ND_DEFROUTER_LIST_NEXT(installed_dr) == NULL)
selected_dr = ND_DEFROUTER_LIST_FIRST();
else
selected_dr = ND_DEFROUTER_LIST_NEXT(installed_dr);
} else if (installed_dr &&
nd6_is_llinfo_probreach(installed_dr) &&
rtpref(selected_dr) <= rtpref(installed_dr)) {
selected_dr = installed_dr;
}
/*
* If the selected router is different than the installed one,
* remove the installed router and install the selected one.
* Note that the selected router is never NULL here.
*/
if (installed_dr != selected_dr) {
if (installed_dr)
defrouter_delreq(installed_dr);
defrouter_addreq(selected_dr);
}
return;
}
/*
* for default router selection
* regards router-preference field as a 2-bit signed integer
*/
static int
rtpref(struct nd_defrouter *dr)
{
switch (dr->flags & ND_RA_FLAG_RTPREF_MASK) {
case ND_RA_FLAG_RTPREF_HIGH:
return (RTPREF_HIGH);
case ND_RA_FLAG_RTPREF_MEDIUM:
case ND_RA_FLAG_RTPREF_RSV:
return (RTPREF_MEDIUM);
case ND_RA_FLAG_RTPREF_LOW:
return (RTPREF_LOW);
default:
/*
* This case should never happen. If it did, it would mean a
* serious bug of kernel internal. We thus always bark here.
* Or, can we even panic?
*/
log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->flags);
return (RTPREF_INVALID);
}
/* NOTREACHED */
}
static struct nd_defrouter *
defrtrlist_update(struct nd_defrouter *newdr)
{
struct nd_defrouter *dr, *n, *ret = NULL;
struct in6_ifextra *ext = newdr->ifp->if_afdata[AF_INET6];
ND6_ASSERT_WLOCK();
if ((dr = nd6_defrouter_lookup(&newdr->rtaddr, newdr->ifp)) != NULL) {
/* entry exists */
if (newdr->rtlifetime == 0) {
nd6_defrtrlist_del(dr, ext);
dr = NULL;
} else {
int oldpref = rtpref(dr);
/* override */
dr->flags = newdr->flags; /* xxx flag check */
dr->rtlifetime = newdr->rtlifetime;
dr->expire = newdr->expire;
/*
* If the preference does not change, there's no need
* to sort the entries.
*/
if (rtpref(newdr) == oldpref) {
ret = dr;
goto out;
}
/*
* preferred router may be changed, so relocate
* this router.
* XXX: calling TAILQ_REMOVE directly is a bad manner.
* However, since nd6_defrtrlist_del() has many side
* effects, we intentionally do so here.
* nd6_defrouter_select() below will handle routing
* changes later.
*/
ND_DEFROUTER_LIST_REMOVE(dr);
n = dr;
goto insert;
}
ret = dr;
goto out;
}
if (ip6_maxifdefrouters >= 0 && ext->ndefrouters >= ip6_maxifdefrouters)
goto out;
/* entry does not exist */
if (newdr->rtlifetime == 0)
goto out;
if (ip6_rtadv_maxroutes <= nd6_numroutes) {
ICMP6_STATINC(ICMP6_STAT_DROPPED_RAROUTE);
goto out;
}
n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
if (n == NULL)
goto out;
memset(n, 0, sizeof(*n));
*n = *newdr;
insert:
/*
* Insert the new router in the Default Router List;
* The Default Router List should be in the descending order
* of router-preferece. Routers with the same preference are
* sorted in the arriving time order.
*/
/* insert at the end of the group */
ND_DEFROUTER_LIST_FOREACH(dr) {
if (rtpref(n) > rtpref(dr))
break;
}
if (dr)
ND_DEFROUTER_LIST_INSERT_BEFORE(dr, n);
else
ND_DEFROUTER_LIST_INSERT_TAIL(n);
nd6_defrouter_select();
ext->ndefrouters++;
ret = n;
out:
return ret;
}
static struct nd_pfxrouter *
pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
{
struct nd_pfxrouter *search;
ND6_ASSERT_LOCK();
LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) {
if (search->router == dr)
break;
}
return (search);
}
static void
pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
{
struct nd_pfxrouter *newpfr;
ND6_ASSERT_WLOCK();
newpfr = malloc(sizeof(*newpfr), M_IP6NDP, M_NOWAIT|M_ZERO);
if (newpfr == NULL)
return;
newpfr->router = dr;
LIST_INSERT_HEAD(&pr->ndpr_advrtrs, newpfr, pfr_entry);
nd6_pfxlist_onlink_check();
}
static void
pfxrtr_del(struct nd_pfxrouter *pfr)
{
LIST_REMOVE(pfr, pfr_entry);
free(pfr, M_IP6NDP);
}
static struct nd_prefix *
nd6_prefix_lookup(struct nd_prefixctl *key)
{
struct nd_prefix *search;
ND_PREFIX_LIST_FOREACH(search) {
if (key->ndprc_ifp == search->ndpr_ifp &&
key->ndprc_plen == search->ndpr_plen &&
in6_are_prefix_equal(&key->ndprc_prefix.sin6_addr,
&search->ndpr_prefix.sin6_addr, key->ndprc_plen)) {
break;
}
}
return (search);
}
static void
purge_detached(struct ifnet *ifp)
{
struct nd_prefix *pr, *pr_next;
struct in6_ifaddr *ia;
struct ifaddr *ifa, *ifa_next;
restart:
ND6_ASSERT_WLOCK();
ND_PREFIX_LIST_FOREACH_SAFE(pr, pr_next) {
int s;
/*
* This function is called when we need to make more room for
* new prefixes rather than keeping old, possibly stale ones.
* Detached prefixes would be a good candidate; if all routers
* that advertised the prefix expired, the prefix is also
* probably stale.
*/
if (pr->ndpr_ifp != ifp ||
IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
!LIST_EMPTY(&pr->ndpr_advrtrs)))
continue;
s = pserialize_read_enter();
for (ifa = IFADDR_READER_FIRST(ifp); ifa; ifa = ifa_next) {
ifa_next = IFADDR_READER_NEXT(ifa);
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ia = (struct in6_ifaddr *)ifa;
if ((ia->ia6_flags & IN6_IFF_AUTOCONF) ==
IN6_IFF_AUTOCONF && ia->ia6_ndpr == pr) {
pserialize_read_exit(s);
ND6_UNLOCK();
/* in6_purgeaddr may destroy pr. */
in6_purgeaddr(ifa);
ND6_WLOCK();
goto restart;
}
}
pserialize_read_exit(s);
KASSERT(pr->ndpr_refcnt == 0);
nd6_prelist_remove(pr);
}
}
static int
nd6_prelist_add(struct nd_prefixctl *prc, struct nd_defrouter *dr,
struct nd_prefix **newp)
{
struct nd_prefix *newpr = NULL;
int i;
int error;
struct in6_ifextra *ext = prc->ndprc_ifp->if_afdata[AF_INET6];
ND6_ASSERT_WLOCK();
if (ip6_maxifprefixes >= 0) {
if (ext->nprefixes >= ip6_maxifprefixes / 2)
purge_detached(prc->ndprc_ifp);
if (ext->nprefixes >= ip6_maxifprefixes)
return ENOMEM;
}
error = 0;
newpr = malloc(sizeof(*newpr), M_IP6NDP, M_NOWAIT|M_ZERO);
if (newpr == NULL)
return ENOMEM;
newpr->ndpr_ifp = prc->ndprc_ifp;
newpr->ndpr_prefix = prc->ndprc_prefix;
newpr->ndpr_plen = prc->ndprc_plen;
newpr->ndpr_vltime = prc->ndprc_vltime;
newpr->ndpr_pltime = prc->ndprc_pltime;
newpr->ndpr_flags = prc->ndprc_flags;
if ((error = in6_init_prefix_ltimes(newpr)) != 0) {
free(newpr, M_IP6NDP);
return(error);
}
newpr->ndpr_lastupdate = time_uptime;
if (newp != NULL)
*newp = newpr;
/* initialization */
LIST_INIT(&newpr->ndpr_advrtrs);
in6_prefixlen2mask(&newpr->ndpr_mask, newpr->ndpr_plen);
/* make prefix in the canonical form */
for (i = 0; i < 4; i++) {
newpr->ndpr_prefix.sin6_addr.s6_addr32[i] &=
newpr->ndpr_mask.s6_addr32[i];
}
/* link ndpr_entry to nd_prefix list */
ND_PREFIX_LIST_INSERT_HEAD(newpr);
/* ND_OPT_PI_FLAG_ONLINK processing */
if (newpr->ndpr_raf_onlink) {
int e;
if ((e = nd6_prefix_onlink(newpr)) != 0) {
char ip6buf[INET6_ADDRSTRLEN];
nd6log(LOG_ERR, "failed to make "
"the prefix %s/%d on-link on %s (errno=%d)\n",
IN6_PRINT(ip6buf, &prc->ndprc_prefix.sin6_addr),
prc->ndprc_plen, if_name(prc->ndprc_ifp), e);
/* proceed anyway. XXX: is it correct? */
}
}
if (dr)
pfxrtr_add(newpr, dr);
ext->nprefixes++;
return 0;
}
void
nd6_prefix_unref(struct nd_prefix *pr)
{
ND6_WLOCK();
pr->ndpr_refcnt--;
if (pr->ndpr_refcnt == 0)
nd6_prelist_remove(pr);
ND6_UNLOCK();
}
void
nd6_invalidate_prefix(struct nd_prefix *pr)
{
int e;
ND6_ASSERT_WLOCK();
/* make sure to invalidate the prefix until it is really freed. */
pr->ndpr_vltime = 0;
pr->ndpr_pltime = 0;
#if 0
/*
* Though these flags are now meaningless, we'd rather keep the value
* not to confuse users when executing "ndp -p".
*/
pr->ndpr_raf_onlink = 0;
pr->ndpr_raf_auto = 0;
#endif
if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
(e = nd6_prefix_offlink(pr)) != 0) {
char ip6buf[INET6_ADDRSTRLEN];
nd6log(LOG_ERR,
"failed to make %s/%d offlink on %s, errno=%d\n",
IN6_PRINT(ip6buf, &pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, if_name(pr->ndpr_ifp), e);
/* what should we do? */
}
}
void
nd6_prelist_remove(struct nd_prefix *pr)
{
struct nd_pfxrouter *pfr, *next;
struct in6_ifextra *ext = pr->ndpr_ifp->if_afdata[AF_INET6];
ND6_ASSERT_WLOCK();
KASSERT(pr->ndpr_refcnt == 0);
nd6_invalidate_prefix(pr);
/* unlink ndpr_entry from nd_prefix list */
ND_PREFIX_LIST_REMOVE(pr);
/* free list of routers that adversed the prefix */
for (pfr = LIST_FIRST(&pr->ndpr_advrtrs); pfr != NULL; pfr = next) {
next = LIST_NEXT(pfr, pfr_entry);
free(pfr, M_IP6NDP);
}
if (ext) {
ext->nprefixes--;
if (ext->nprefixes < 0) {
log(LOG_WARNING, "nd6_prelist_remove: negative count on "
"%s\n", pr->ndpr_ifp->if_xname);
}
}
free(pr, M_IP6NDP);
nd6_pfxlist_onlink_check();
}
static int
prelist_update(struct nd_prefixctl *newprc,
struct nd_defrouter *dr, /* may be NULL */
struct mbuf *m,
int mcast)
{
struct in6_ifaddr *ia6_match = NULL;
struct ifaddr *ifa;
struct ifnet *ifp = newprc->ndprc_ifp;
struct nd_prefix *pr;
int error = 0;
int auth;
struct in6_addrlifetime lt6_tmp;
int ss;
char ip6buf[INET6_ADDRSTRLEN];
KASSERT(m != NULL);
ND6_ASSERT_WLOCK();
auth = (m->m_flags & M_AUTHIPHDR) ? 1 : 0;
if ((pr = nd6_prefix_lookup(newprc)) != NULL) {
/*
* nd6_prefix_lookup() ensures that pr and newprc have the same
* prefix on a same interface.
*/
/*
* Update prefix information. Note that the on-link (L) bit
* and the autonomous (A) bit should NOT be changed from 1
* to 0.
*/
if (newprc->ndprc_raf_onlink == 1)
pr->ndpr_raf_onlink = 1;
if (newprc->ndprc_raf_auto == 1)
pr->ndpr_raf_auto = 1;
if (newprc->ndprc_raf_onlink) {
pr->ndpr_vltime = newprc->ndprc_vltime;
pr->ndpr_pltime = newprc->ndprc_pltime;
(void)in6_init_prefix_ltimes(pr); /* XXX error case? */
pr->ndpr_lastupdate = time_uptime;
}
if (newprc->ndprc_raf_onlink &&
(pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
int e;
if ((e = nd6_prefix_onlink(pr)) != 0) {
nd6log(LOG_ERR,
"failed to make "
"the prefix %s/%d on-link on %s "
"(errno=%d)\n",
IN6_PRINT(ip6buf,
&pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, if_name(pr->ndpr_ifp), e);
/* proceed anyway. XXX: is it correct? */
}
}
if (dr && pfxrtr_lookup(pr, dr) == NULL)
pfxrtr_add(pr, dr);
} else {
struct nd_prefix *newpr = NULL;
if (newprc->ndprc_vltime == 0)
goto end;
if (newprc->ndprc_raf_onlink == 0 && newprc->ndprc_raf_auto == 0)
goto end;
if (ip6_rtadv_maxroutes <= nd6_numroutes) {
ICMP6_STATINC(ICMP6_STAT_DROPPED_RAROUTE);
goto end;
}
error = nd6_prelist_add(newprc, dr, &newpr);
if (error != 0 || newpr == NULL) {
nd6log(LOG_NOTICE,
"nd6_prelist_add failed for %s/%d on %s "
"errno=%d, returnpr=%p\n",
IN6_PRINT(ip6buf, &newprc->ndprc_prefix.sin6_addr),
newprc->ndprc_plen, if_name(newprc->ndprc_ifp),
error, newpr);
goto end; /* we should just give up in this case. */
}
/*
* XXX: from the ND point of view, we can ignore a prefix
* with the on-link bit being zero. However, we need a
* prefix structure for references from autoconfigured
* addresses. Thus, we explicitly make sure that the prefix
* itself expires now.
*/
if (newpr->ndpr_raf_onlink == 0) {
newpr->ndpr_vltime = 0;
newpr->ndpr_pltime = 0;
in6_init_prefix_ltimes(newpr);
}
pr = newpr;
}
/*
* Address autoconfiguration based on Section 5.5.3 of RFC 2462.
* Note that pr must be non NULL at this point.
*/
/* 5.5.3 (a). Ignore the prefix without the A bit set. */
if (!newprc->ndprc_raf_auto)
goto end;
/*
* 5.5.3 (b). the link-local prefix should have been ignored in
* nd6_ra_input.
*/
/* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
if (newprc->ndprc_pltime > newprc->ndprc_vltime) {
error = EINVAL; /* XXX: won't be used */
goto end;
}
/*
* 5.5.3 (d). If the prefix advertised is not equal to the prefix of
* an address configured by stateless autoconfiguration already in the
* list of addresses associated with the interface, and the Valid
* Lifetime is not 0, form an address. We first check if we have
* a matching prefix.
* Note: we apply a clarification in rfc2462bis-02 here. We only
* consider autoconfigured addresses while RFC2462 simply said
* "address".
*/
ss = pserialize_read_enter();
IFADDR_READER_FOREACH(ifa, ifp) {
struct in6_ifaddr *ia6;
u_int32_t remaininglifetime;
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ia6 = (struct in6_ifaddr *)ifa;
/*
* We only consider autoconfigured addresses as per rfc2462bis.
*/
if (!(ia6->ia6_flags & IN6_IFF_AUTOCONF))
continue;
/*
* Spec is not clear here, but I believe we should concentrate
* on unicast (i.e. not anycast) addresses.
* XXX: other ia6_flags? detached or duplicated?
*/
if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0)
continue;
/*
* Ignore the address if it is not associated with a prefix
* or is associated with a prefix that is different from this
* one. (pr is never NULL here)
*/
if (ia6->ia6_ndpr != pr)
continue;
if (ia6_match == NULL) /* remember the first one */
ia6_match = ia6;
/*
* An already autoconfigured address matched. Now that we
* are sure there is at least one matched address, we can
* proceed to 5.5.3. (e): update the lifetimes according to the
* "two hours" rule and the privacy extension.
* We apply some clarifications in rfc2462bis:
* - use remaininglifetime instead of storedlifetime as a
* variable name
* - remove the dead code in the "two-hour" rule
*/
#define TWOHOUR (120*60)
lt6_tmp = ia6->ia6_lifetime;
if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
remaininglifetime = ND6_INFINITE_LIFETIME;
else if (time_uptime - ia6->ia6_updatetime >
lt6_tmp.ia6t_vltime) {
/*
* The case of "invalid" address. We should usually
* not see this case.
*/
remaininglifetime = 0;
} else
remaininglifetime = lt6_tmp.ia6t_vltime -
(time_uptime - ia6->ia6_updatetime);
/* when not updating, keep the current stored lifetime. */
lt6_tmp.ia6t_vltime = remaininglifetime;
if (TWOHOUR < newprc->ndprc_vltime ||
remaininglifetime < newprc->ndprc_vltime) {
lt6_tmp.ia6t_vltime = newprc->ndprc_vltime;
} else if (remaininglifetime <= TWOHOUR) {
if (auth)
lt6_tmp.ia6t_vltime = newprc->ndprc_vltime;
} else {
/*
* newprc->ndprc_vltime <= TWOHOUR &&
* TWOHOUR < remaininglifetime
*/
lt6_tmp.ia6t_vltime = TWOHOUR;
}
/* The 2 hour rule is not imposed for preferred lifetime. */
lt6_tmp.ia6t_pltime = newprc->ndprc_pltime;
in6_init_address_ltimes(pr, &lt6_tmp);
/*
* We need to treat lifetimes for temporary addresses
* differently, according to
* draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
* we only update the lifetimes when they are in the maximum
* intervals.
*/
if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
u_int32_t maxvltime, maxpltime;
if (ip6_temp_valid_lifetime >
(u_int32_t)((time_uptime - ia6->ia6_createtime) +
ip6_desync_factor)) {
maxvltime = ip6_temp_valid_lifetime -
(time_uptime - ia6->ia6_createtime) -
ip6_desync_factor;
} else
maxvltime = 0;
if (ip6_temp_preferred_lifetime >
(u_int32_t)((time_uptime - ia6->ia6_createtime) +
ip6_desync_factor)) {
maxpltime = ip6_temp_preferred_lifetime -
(time_uptime - ia6->ia6_createtime) -
ip6_desync_factor;
} else
maxpltime = 0;
if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
lt6_tmp.ia6t_vltime > maxvltime) {
lt6_tmp.ia6t_vltime = maxvltime;
}
if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
lt6_tmp.ia6t_pltime > maxpltime) {
lt6_tmp.ia6t_pltime = maxpltime;
}
}
ia6->ia6_lifetime = lt6_tmp;
ia6->ia6_updatetime = time_uptime;
}
pserialize_read_exit(ss);
if (ia6_match == NULL && newprc->ndprc_vltime) {
int ifidlen;
struct in6_ifaddr *ia6;
struct psref psref;
/*
* 5.5.3 (d) (continued)
* No address matched and the valid lifetime is non-zero.
* Create a new address.
*/
/*
* Prefix Length check:
* If the sum of the prefix length and interface identifier
* length does not equal 128 bits, the Prefix Information
* option MUST be ignored. The length of the interface
* identifier is defined in a separate link-type specific
* document.
*/
ifidlen = in6_if2idlen(ifp);
if (ifidlen < 0) {
/* this should not happen, so we always log it. */
log(LOG_ERR, "%s: IFID undefined (%s)\n",
__func__, if_name(ifp));
goto end;
}
if (ifidlen + pr->ndpr_plen != 128) {
nd6log(LOG_INFO,
"invalid prefixlen %d for %s, ignored\n",
pr->ndpr_plen, if_name(ifp));
goto end;
}
if ((ia6 = in6_ifadd(newprc, mcast, &psref)) != NULL) {
/*
* note that we should use pr (not newprc) for reference.
*/
pr->ndpr_refcnt++;
ia6->ia6_ndpr = pr;
/* toggle onlink state if the address was assigned
* a prefix route. */
if (ia6->ia_flags & IFA_ROUTE)
pr->ndpr_stateflags |= NDPRF_ONLINK;
/*
* draft-ietf-ipngwg-temp-addresses-v2-00 3.3 (2).
* When a new public address is created as described
* in RFC2462, also create a new temporary address.
*
* draft-ietf-ipngwg-temp-addresses-v2-00 3.5.
* When an interface connects to a new link, a new
* randomized interface identifier should be generated
* immediately together with a new set of temporary
* addresses. Thus, we specifiy 1 as the 2nd arg of
* in6_tmpifadd().
*/
if (ip6_use_tempaddr) {
int e;
if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
nd6log(LOG_NOTICE,
"failed to create a temporary "
"address, errno=%d\n", e);
}
}
ia6_release(ia6, &psref);
/*
* A newly added address might affect the status
* of other addresses, so we check and update it.
* XXX: what if address duplication happens?
*/
nd6_pfxlist_onlink_check();
} else {
/* just set an error. do not bark here. */
error = EADDRNOTAVAIL; /* XXX: might be unused. */
}
}
end:
return error;
}
/*
* A supplement function used in the on-link detection below;
* detect if a given prefix has a (probably) reachable advertising router.
* XXX: lengthy function name...
*/
static struct nd_pfxrouter *
find_pfxlist_reachable_router(struct nd_prefix *pr)
{
struct nd_pfxrouter *pfxrtr;
for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr;
pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
if (pfxrtr->router->ifp->if_flags & IFF_UP &&
pfxrtr->router->ifp->if_link_state != LINK_STATE_DOWN &&
nd6_is_llinfo_probreach(pfxrtr->router))
break; /* found */
}
return (pfxrtr);
}
/*
* Check if each prefix in the prefix list has at least one available router
* that advertised the prefix (a router is "available" if its neighbor cache
* entry is reachable or probably reachable).
* If the check fails, the prefix may be off-link, because, for example,
* we have moved from the network but the lifetime of the prefix has not
* expired yet. So we should not use the prefix if there is another prefix
* that has an available router.
* But, if there is no prefix that has an available router, we still regards
* all the prefixes as on-link. This is because we can't tell if all the
* routers are simply dead or if we really moved from the network and there
* is no router around us.
*/
void
nd6_pfxlist_onlink_check(void)
{
struct nd_prefix *pr;
struct in6_ifaddr *ia;
struct nd_defrouter *dr;
struct nd_pfxrouter *pfxrtr = NULL;
int s;
char ip6buf[INET6_ADDRSTRLEN];
ND6_ASSERT_WLOCK();
/*
* Check if there is a prefix that has a reachable advertising
* router.
*/
ND_PREFIX_LIST_FOREACH(pr) {
if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
break;
}
/*
* If we have no such prefix, check whether we still have a router
* that does not advertise any prefixes.
*/
if (pr == NULL) {
ND_DEFROUTER_LIST_FOREACH(dr) {
struct nd_prefix *pr0;
ND_PREFIX_LIST_FOREACH(pr0) {
if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
break;
}
if (pfxrtr)
break;
}
}
if (pr != NULL || (!ND_DEFROUTER_LIST_EMPTY() && !pfxrtr)) {
/*
* There is at least one prefix that has a reachable router,
* or at least a router which probably does not advertise
* any prefixes. The latter would be the case when we move
* to a new link where we have a router that does not provide
* prefixes and we configure an address by hand.
* Detach prefixes which have no reachable advertising
* router, and attach other prefixes.
*/
ND_PREFIX_LIST_FOREACH(pr) {
/* XXX: a link-local prefix should never be detached */
if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
continue;
/*
* we aren't interested in prefixes without the L bit
* set.
*/
if (pr->ndpr_raf_onlink == 0)
continue;
if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
find_pfxlist_reachable_router(pr) == NULL)
pr->ndpr_stateflags |= NDPRF_DETACHED;
if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
find_pfxlist_reachable_router(pr) != 0)
pr->ndpr_stateflags &= ~NDPRF_DETACHED;
}
} else {
/* there is no prefix that has a reachable router */
ND_PREFIX_LIST_FOREACH(pr) {
if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
continue;
if (pr->ndpr_raf_onlink == 0)
continue;
if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
pr->ndpr_stateflags &= ~NDPRF_DETACHED;
}
}
/*
* Remove each interface route associated with a (just) detached
* prefix, and reinstall the interface route for a (just) attached
* prefix. Note that all attempt of reinstallation does not
* necessarily success, when a same prefix is shared among multiple
* interfaces. Such cases will be handled in nd6_prefix_onlink,
* so we don't have to care about them.
*/
ND_PREFIX_LIST_FOREACH(pr) {
int e;
if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
continue;
if (pr->ndpr_raf_onlink == 0)
continue;
if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
(pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
if ((e = nd6_prefix_offlink(pr)) != 0) {
nd6log(LOG_ERR,
"failed to make %s/%d offlink, errno=%d\n",
IN6_PRINT(ip6buf,
&pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, e);
}
}
if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
(pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
pr->ndpr_raf_onlink) {
if ((e = nd6_prefix_onlink(pr)) != 0) {
nd6log(LOG_ERR,
"failed to make %s/%d onlink, errno=%d\n",
IN6_PRINT(ip6buf,
&pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, e);
}
}
}
int bound = curlwp_bind();
/*
* Changes on the prefix status might affect address status as well.
* Make sure that all addresses derived from an attached prefix are
* attached, and that all addresses derived from a detached prefix are
* detached. Note, however, that a manually configured address should
* always be attached.
* The precise detection logic is same as the one for prefixes.
*/
s = pserialize_read_enter();
IN6_ADDRLIST_READER_FOREACH(ia) {
struct psref psref;
bool found;
if (!(ia->ia6_flags & IN6_IFF_AUTOCONF))
continue;
if (ia->ia6_ndpr == NULL) {
/*
* This can happen when we first configure the address
* (i.e. the address exists, but the prefix does not).
* XXX: complicated relationships...
*/
continue;
}
ia6_acquire(ia, &psref);
pserialize_read_exit(s);
found = find_pfxlist_reachable_router(ia->ia6_ndpr) != NULL;
s = pserialize_read_enter();
ia6_release(ia, &psref);
if (found)
break;
}
pserialize_read_exit(s);
if (ia) {
s = pserialize_read_enter();
IN6_ADDRLIST_READER_FOREACH(ia) {
struct ifaddr *ifa = (struct ifaddr *)ia;
struct psref psref;
if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0)
continue;
if (ia->ia6_ndpr == NULL) /* XXX: see above. */
continue;
ia6_acquire(ia, &psref);
pserialize_read_exit(s);
if (find_pfxlist_reachable_router(ia->ia6_ndpr)) {
if (ia->ia6_flags & IN6_IFF_DETACHED) {
ia->ia6_flags &= ~IN6_IFF_DETACHED;
ia->ia6_flags |= IN6_IFF_TENTATIVE;
nd6_dad_start(ifa,
0);
/* We will notify the routing socket
* of the DAD result, so no need to
* here */
}
} else {
if ((ia->ia6_flags & IN6_IFF_DETACHED) == 0) {
ia->ia6_flags |= IN6_IFF_DETACHED;
rt_addrmsg(RTM_NEWADDR, ifa);
}
}
s = pserialize_read_enter();
ia6_release(ia, &psref);
}
pserialize_read_exit(s);
}
else {
s = pserialize_read_enter();
IN6_ADDRLIST_READER_FOREACH(ia) {
if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0)
continue;
if (ia->ia6_flags & IN6_IFF_DETACHED) {
struct ifaddr *ifa = (struct ifaddr *)ia;
struct psref psref;
ia->ia6_flags &= ~IN6_IFF_DETACHED;
ia->ia6_flags |= IN6_IFF_TENTATIVE;
ia6_acquire(ia, &psref);
pserialize_read_exit(s);
/* Do we need a delay in this case? */
nd6_dad_start(ifa, 0);
s = pserialize_read_enter();
ia6_release(ia, &psref);
}
}
pserialize_read_exit(s);
}
curlwp_bindx(bound);
}
static int
nd6_prefix_onlink(struct nd_prefix *pr)
{
struct ifaddr *ifa;
struct ifnet *ifp = pr->ndpr_ifp;
struct sockaddr_in6 mask6;
struct nd_prefix *opr;
u_long rtflags;
int error = 0;
struct psref psref;
int bound;
char ip6buf[INET6_ADDRSTRLEN];
char ip6bufp[INET6_ADDRSTRLEN], ip6bufm[INET6_ADDRSTRLEN];
ND6_ASSERT_WLOCK();
/* sanity check */
if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
nd6log(LOG_ERR, "%s/%d is already on-link\n",
IN6_PRINT(ip6buf, &pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen);
return (EEXIST);
}
/*
* Add the interface route associated with the prefix. Before
* installing the route, check if there's the same prefix on another
* interface, and the prefix has already installed the interface route.
* Although such a configuration is expected to be rare, we explicitly
* allow it.
*/
ND_PREFIX_LIST_FOREACH(opr) {
if (opr == pr)
continue;
if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
continue;
if (opr->ndpr_plen == pr->ndpr_plen &&
in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
&opr->ndpr_prefix.sin6_addr, pr->ndpr_plen))
return (0);
}
/*
* We prefer link-local addresses as the associated interface address.
*/
/* search for a link-local addr */
bound = curlwp_bind();
ifa = (struct ifaddr *)in6ifa_ifpforlinklocal_psref(ifp,
IN6_IFF_NOTREADY | IN6_IFF_ANYCAST, &psref);
if (ifa == NULL) {
int s = pserialize_read_enter();
IFADDR_READER_FOREACH(ifa, ifp) {
if (ifa->ifa_addr->sa_family == AF_INET6)
break;
}
if (ifa != NULL)
ifa_acquire(ifa, &psref);
pserialize_read_exit(s);
/* should we care about ia6_flags? */
}
if (ifa == NULL) {
/*
* This can still happen, when, for example, we receive an RA
* containing a prefix with the L bit set and the A bit clear,
* after removing all IPv6 addresses on the receiving
* interface. This should, of course, be rare though.
*/
nd6log(LOG_NOTICE, "failed to find any ifaddr"
" to add route for a prefix(%s/%d) on %s\n",
IN6_PRINT(ip6buf, &pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, if_name(ifp));
curlwp_bindx(bound);
return (0);
}
/*
* in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
* ifa->ifa_rtrequest = nd6_rtrequest;
*/
memset(&mask6, 0, sizeof(mask6));
mask6.sin6_family = AF_INET6;
mask6.sin6_len = sizeof(mask6);
mask6.sin6_addr = pr->ndpr_mask;
/* rtrequest() will probably set RTF_UP, but we're not sure. */
rtflags = ifa->ifa_flags | RTF_UP;
if (nd6_need_cache(ifp)) {
/* explicitly set in case ifa_flags does not set the flag. */
rtflags |= RTF_CONNECTED;
} else {
/*
* explicitly clear the cloning bit in case ifa_flags sets it.
*/
rtflags &= ~RTF_CONNECTED;
}
error = rtrequest_newmsg(RTM_ADD, sin6tosa(&pr->ndpr_prefix),
ifa->ifa_addr, sin6tosa(&mask6), rtflags);
if (error == 0) {
nd6_numroutes++;
pr->ndpr_stateflags |= NDPRF_ONLINK;
} else {
nd6log(LOG_ERR, "failed to add route for a"
" prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
"errno = %d\n",
IN6_PRINT(ip6bufp, &pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, if_name(ifp),
IN6_PRINT(ip6buf,
&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
IN6_PRINT(ip6bufm, &mask6.sin6_addr), rtflags, error);
}
ifa_release(ifa, &psref);
curlwp_bindx(bound);
return (error);
}
static int
nd6_prefix_offlink(struct nd_prefix *pr)
{
int error = 0;
struct ifnet *ifp = pr->ndpr_ifp;
struct nd_prefix *opr;
struct sockaddr_in6 sa6, mask6;
char ip6buf[INET6_ADDRSTRLEN];
ND6_ASSERT_WLOCK();
/* sanity check */
if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
nd6log(LOG_ERR, "%s/%d is already off-link\n",
IN6_PRINT(ip6buf, &pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen);
return (EEXIST);
}
sockaddr_in6_init(&sa6, &pr->ndpr_prefix.sin6_addr, 0, 0, 0);
sockaddr_in6_init(&mask6, &pr->ndpr_mask, 0, 0, 0);
error = rtrequest_newmsg(RTM_DELETE, sin6tosa(&sa6), NULL,
sin6tosa(&mask6), 0);
if (error == 0) {
pr->ndpr_stateflags &= ~NDPRF_ONLINK;
nd6_numroutes--;
/*
* There might be the same prefix on another interface,
* the prefix which could not be on-link just because we have
* the interface route (see comments in nd6_prefix_onlink).
* If there's one, try to make the prefix on-link on the
* interface.
*/
ND_PREFIX_LIST_FOREACH(opr) {
if (opr == pr)
continue;
if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
continue;
/*
* KAME specific: detached prefixes should not be
* on-link.
*/
if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
continue;
if (opr->ndpr_plen == pr->ndpr_plen &&
in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
&opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
int e;
if ((e = nd6_prefix_onlink(opr)) != 0) {
nd6log(LOG_ERR, "failed to "
"recover a prefix %s/%d from %s "
"to %s (errno = %d)\n",
IN6_PRINT(ip6buf,
&opr->ndpr_prefix.sin6_addr),
opr->ndpr_plen, if_name(ifp),
if_name(opr->ndpr_ifp), e);
}
}
}
} else {
/* XXX: can we still set the NDPRF_ONLINK flag? */
nd6log(LOG_ERR, "failed to delete route: "
"%s/%d on %s (errno = %d)\n",
IN6_PRINT(ip6buf, &sa6.sin6_addr), pr->ndpr_plen,
if_name(ifp),
error);
}
return error;
}
static struct in6_ifaddr *
in6_ifadd(struct nd_prefixctl *prc, int mcast, struct psref *psref)
{
struct ifnet *ifp = prc->ndprc_ifp;
struct ifaddr *ifa;
struct in6_aliasreq ifra;
struct in6_ifaddr *ia, *ib;
int error, plen0;
struct in6_addr mask;
int prefixlen = prc->ndprc_plen;
int updateflags;
int s;
char ip6buf[INET6_ADDRSTRLEN];
ND6_ASSERT_WLOCK();
in6_prefixlen2mask(&mask, prefixlen);
/*
* find a link-local address (will be interface ID).
* Is it really mandatory? Theoretically, a global or a site-local
* address can be configured without a link-local address, if we
* have a unique interface identifier...
*
* it is not mandatory to have a link-local address, we can generate
* interface identifier on the fly. we do this because:
* (1) it should be the easiest way to find interface identifier.
* (2) RFC2462 5.4 suggesting the use of the same interface identifier
* for multiple addresses on a single interface, and possible shortcut
* of DAD. we omitted DAD for this reason in the past.
* (3) a user can prevent autoconfiguration of global address
* by removing link-local address by hand (this is partly because we
* don't have other way to control the use of IPv6 on an interface.
* this has been our design choice - cf. NRL's "ifconfig auto").
* (4) it is easier to manage when an interface has addresses
* with the same interface identifier, than to have multiple addresses
* with different interface identifiers.
*/
s = pserialize_read_enter();
ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
if (ifa)
ib = (struct in6_ifaddr *)ifa;
else {
pserialize_read_exit(s);
return NULL;
}
#if 0 /* don't care link local addr state, and always do DAD */
/* if link-local address is not eligible, do not autoconfigure. */
if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) {
printf("in6_ifadd: link-local address not ready\n");
return NULL;
}
#endif
/* prefixlen + ifidlen must be equal to 128 */
plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
if (prefixlen != plen0) {
nd6log(LOG_INFO, "wrong prefixlen for %s "
"(prefix=%d ifid=%d)\n",
if_name(ifp), prefixlen, 128 - plen0);
pserialize_read_exit(s);
return NULL;
}
/* make ifaddr */
memset(&ifra, 0, sizeof(ifra));
/*
* in6_update_ifa() does not use ifra_name, but we accurately set it
* for safety.
*/
strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
sockaddr_in6_init(&ifra.ifra_addr, &prc->ndprc_prefix.sin6_addr, 0, 0, 0);
/* prefix */
ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
/* interface ID */
ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
(ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
(ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
(ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
(ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
pserialize_read_exit(s);
/* new prefix mask. */
sockaddr_in6_init(&ifra.ifra_prefixmask, &mask, 0, 0, 0);
/* lifetimes */
ifra.ifra_lifetime.ia6t_vltime = prc->ndprc_vltime;
ifra.ifra_lifetime.ia6t_pltime = prc->ndprc_pltime;
/* XXX: scope zone ID? */
ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
/*
* Make sure that we do not have this address already. This should
* usually not happen, but we can still see this case, e.g., if we
* have manually configured the exact address to be configured.
*/
s = pserialize_read_enter();
if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) {
/* this should be rare enough to make an explicit log */
log(LOG_INFO, "in6_ifadd: %s is already configured\n",
IN6_PRINT(ip6buf, &ifra.ifra_addr.sin6_addr));
pserialize_read_exit(s);
return (NULL);
}
pserialize_read_exit(s);
/*
* Allocate ifaddr structure, link into chain, etc.
* If we are going to create a new address upon receiving a multicasted
* RA, we need to impose a random delay before starting DAD.
* [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
*/
updateflags = 0;
if (mcast)
updateflags |= IN6_IFAUPDATE_DADDELAY;
if ((error = in6_update_ifa(ifp, &ifra, updateflags)) != 0) {
nd6log(LOG_ERR, "failed to make ifaddr %s on %s (errno=%d)\n",
IN6_PRINT(ip6buf, &ifra.ifra_addr.sin6_addr), if_name(ifp),
error);
return (NULL); /* ifaddr must not have been allocated. */
}
ia = in6ifa_ifpwithaddr_psref(ifp, &ifra.ifra_addr.sin6_addr, psref);
return (ia); /* this is always non-NULL */
}
int
in6_tmpifadd(
const struct in6_ifaddr *ia0, /* corresponding public address */
int forcegen,
int dad_delay)
{
struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
struct in6_ifaddr *newia, *ia;
struct in6_aliasreq ifra;
int i, error;
int trylimit = 3; /* XXX: adhoc value */
int updateflags;
u_int32_t randid[2];
u_int32_t vltime0, pltime0;
int s;
ND6_ASSERT_WLOCK();
memset(&ifra, 0, sizeof(ifra));
strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
ifra.ifra_addr = ia0->ia_addr;
/* copy prefix mask */
ifra.ifra_prefixmask = ia0->ia_prefixmask;
/* clear the old IFID */
for (i = 0; i < 4; i++) {
ifra.ifra_addr.sin6_addr.s6_addr32[i] &=
ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
}
again:
if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
(const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
nd6log(LOG_NOTICE, "failed to find a good random IFID\n");
return (EINVAL);
}
ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
(randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
(randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
/*
* in6_get_tmpifid() quite likely provided a unique interface ID.
* However, we may still have a chance to see collision, because
* there may be a time lag between generation of the ID and generation
* of the address. So, we'll do one more sanity check.
*/
s = pserialize_read_enter();
IN6_ADDRLIST_READER_FOREACH(ia) {
if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
&ifra.ifra_addr.sin6_addr)) {
pserialize_read_exit(s);
if (trylimit-- == 0) {
/*
* Give up. Something strange should have
* happened.
*/
nd6log(LOG_NOTICE,
"failed to find a unique random IFID\n");
return (EEXIST);
}
forcegen = 1;
goto again;
}
}
pserialize_read_exit(s);
/*
* The Valid Lifetime is the lower of the Valid Lifetime of the
* public address or TEMP_VALID_LIFETIME.
* The Preferred Lifetime is the lower of the Preferred Lifetime
* of the public address or TEMP_PREFERRED_LIFETIME -
* DESYNC_FACTOR.
*/
if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
(ia0->ia6_lifetime.ia6t_vltime -
(time_uptime - ia0->ia6_updatetime));
if (vltime0 > ip6_temp_valid_lifetime)
vltime0 = ip6_temp_valid_lifetime;
} else
vltime0 = ip6_temp_valid_lifetime;
if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
(ia0->ia6_lifetime.ia6t_pltime -
(time_uptime - ia0->ia6_updatetime));
if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor){
pltime0 = ip6_temp_preferred_lifetime -
ip6_desync_factor;
}
} else
pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor;
ifra.ifra_lifetime.ia6t_vltime = vltime0;
ifra.ifra_lifetime.ia6t_pltime = pltime0;
/*
* A temporary address is created only if this calculated Preferred
* Lifetime is greater than REGEN_ADVANCE time units.
*/
if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance)
return (0);
/* XXX: scope zone ID? */
ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
/* allocate ifaddr structure, link into chain, etc. */
updateflags = 0;
if (dad_delay)
updateflags |= IN6_IFAUPDATE_DADDELAY;
if ((error = in6_update_ifa(ifp, &ifra, updateflags)) != 0)
return (error);
s = pserialize_read_enter();
newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
if (newia == NULL) { /* XXX: can it happen? */
pserialize_read_exit(s);
nd6log(LOG_ERR,
"ifa update succeeded, but we got no ifaddr\n");
return (EINVAL); /* XXX */
}
newia->ia6_ndpr = ia0->ia6_ndpr;
newia->ia6_ndpr->ndpr_refcnt++;
pserialize_read_exit(s);
/*
* A newly added address might affect the status of other addresses.
* XXX: when the temporary address is generated with a new public
* address, the onlink check is redundant. However, it would be safe
* to do the check explicitly everywhere a new address is generated,
* and, in fact, we surely need the check when we create a new
* temporary address due to deprecation of an old temporary address.
*/
nd6_pfxlist_onlink_check();
return (0);
}
static int
in6_init_prefix_ltimes(struct nd_prefix *ndpr)
{
ND6_ASSERT_WLOCK();
/* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
nd6log(LOG_INFO, "preferred lifetime"
"(%d) is greater than valid lifetime(%d)\n",
(u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime);
return (EINVAL);
}
if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
ndpr->ndpr_preferred = 0;
else
ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime;
if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
ndpr->ndpr_expire = 0;
else
ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
return 0;
}
static void
in6_init_address_ltimes(struct nd_prefix *newpr,
struct in6_addrlifetime *lt6)
{
/* Valid lifetime must not be updated unless explicitly specified. */
/* init ia6t_expire */
if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
lt6->ia6t_expire = 0;
else {
lt6->ia6t_expire = time_uptime;
lt6->ia6t_expire += lt6->ia6t_vltime;
}
/* init ia6t_preferred */
if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
lt6->ia6t_preferred = 0;
else {
lt6->ia6t_preferred = time_uptime;
lt6->ia6t_preferred += lt6->ia6t_pltime;
}
}
/*
* Delete all the routing table entries that use the specified gateway.
* XXX: this function causes search through all entries of routing table, so
* it shouldn't be called when acting as a router.
*/
void
nd6_rt_flush(struct in6_addr *gateway, struct ifnet *ifp)
{
#ifndef NET_MPSAFE
int s = splsoftnet();
#endif
/* We'll care only link-local addresses */
if (!IN6_IS_ADDR_LINKLOCAL(gateway))
goto out;
rt_delete_matched_entries(AF_INET6, rt6_deleteroute_matcher, gateway);
out:
#ifndef NET_MPSAFE
splx(s);
#endif
return; /* XXX gcc */
}
static int
rt6_deleteroute_matcher(struct rtentry *rt, void *arg)
{
struct in6_addr *gate = (struct in6_addr *)arg;
if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
return (0);
if (!IN6_ARE_ADDR_EQUAL(gate, &satosin6(rt->rt_gateway)->sin6_addr))
return (0);
/*
* Do not delete a static route.
* XXX: this seems to be a bit ad-hoc. Should we consider the
* 'cloned' bit instead?
*/
if ((rt->rt_flags & RTF_STATIC) != 0)
return (0);
/*
* We delete only host route. This means, in particular, we don't
* delete default route.
*/
if ((rt->rt_flags & RTF_HOST) == 0)
return (0);
return 1;
}
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