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freebsd-dev/sys/netinet6/nd6_rtr.c
Hajimu UMEMOTO 11f3a6e295 made sure to keep the current stored lifetime when it was not updated 
by an RA.
(a detailed description of this issue is found at the following URL.)
http://www.tahi.org/report/freebsd/freebsd48-rc2-20030316/host/lcna-stateless-addrconf/38.html

Reported by:	Ozoe Nobumichi <ozoe@tahi.org>
		through a periodic TAHI test
Submitted by:	JINMEI Tatuya <jinmei@isl.rdc.toshiba.co.jp>
Obtained from:	KAME
2003-03-26 17:37:35 +00:00

1983 lines
53 KiB
C
Raw Blame History

/* $FreeBSD$ */
/* $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei 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 "opt_inet.h"
#include "opt_inet6.h"
#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/syslog.h>
#include <sys/queue.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/radix.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/scope6_var.h>
#include <net/net_osdep.h>
#define SDL(s) ((struct sockaddr_dl *)s)
static struct nd_defrouter *defrtrlist_update __P((struct nd_defrouter *));
static struct in6_ifaddr *in6_ifadd __P((struct nd_prefix *,
struct in6_addr *));
static struct nd_pfxrouter *pfxrtr_lookup __P((struct nd_prefix *,
struct nd_defrouter *));
static void pfxrtr_add __P((struct nd_prefix *, struct nd_defrouter *));
static void pfxrtr_del __P((struct nd_pfxrouter *));
static struct nd_pfxrouter *find_pfxlist_reachable_router
__P((struct nd_prefix *));
static void defrouter_addifreq __P((struct ifnet *));
static void nd6_rtmsg __P((int, struct rtentry *));
static void in6_init_address_ltimes __P((struct nd_prefix *ndpr,
struct in6_addrlifetime *lt6));
static int rt6_deleteroute __P((struct radix_node *, void *));
extern int nd6_recalc_reachtm_interval;
static struct ifnet *nd6_defifp;
int nd6_defifindex;
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;
/*
* shorter lifetimes for debugging purposes.
int ip6_temp_preferred_lifetime = 800;
static int ip6_temp_valid_lifetime = 1800;
*/
int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE;
/*
* Receive Router Solicitation Message - just for routers.
* Router solicitation/advertisement is mostly managed by userland program
* (rtadvd) so here we have no function like nd6_ra_output().
*
* Based on RFC 2461
*/
void
nd6_rs_input(m, off, icmp6len)
struct mbuf *m;
int off, icmp6len;
{
struct ifnet *ifp = m->m_pkthdr.rcvif;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct nd_router_solicit *nd_rs;
struct in6_addr saddr6 = ip6->ip6_src;
#if 0
struct in6_addr daddr6 = ip6->ip6_dst;
#endif
char *lladdr = NULL;
int lladdrlen = 0;
#if 0
struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL;
struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL;
struct rtentry *rt = NULL;
int is_newentry;
#endif
union nd_opts ndopts;
/* If I'm not a router, ignore it. */
if (ip6_accept_rtadv != 0 || ip6_forwarding != 1)
goto freeit;
/* Sanity checks */
if (ip6->ip6_hlim != 255) {
nd6log((LOG_ERR,
"nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
ip6_sprintf(&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;
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, icmp6len,);
nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
#else
IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
if (nd_rs == NULL) {
icmp6stat.icp6s_tooshort++;
return;
}
#endif
icmp6len -= sizeof(*nd_rs);
nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
if (nd6_options(&ndopts) < 0) {
nd6log((LOG_INFO,
"nd6_rs_input: 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,
"nd6_rs_input: lladdrlen mismatch for %s "
"(if %d, RS packet %d)\n",
ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
goto bad;
}
nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
freeit:
m_freem(m);
return;
bad:
icmp6stat.icp6s_badrs++;
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(m, off, icmp6len)
struct mbuf *m;
int off, icmp6len;
{
struct ifnet *ifp = m->m_pkthdr.rcvif;
struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index];
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct nd_router_advert *nd_ra;
struct in6_addr saddr6 = ip6->ip6_src;
#if 0
struct in6_addr daddr6 = ip6->ip6_dst;
int flags; /* = nd_ra->nd_ra_flags_reserved; */
int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0);
int is_other = ((flags & ND_RA_FLAG_OTHER) != 0);
#endif
union nd_opts ndopts;
struct nd_defrouter *dr;
if (ip6_accept_rtadv == 0)
goto freeit;
if (ip6->ip6_hlim != 255) {
nd6log((LOG_ERR,
"nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
goto bad;
}
if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
nd6log((LOG_ERR,
"nd6_ra_input: src %s is not link-local\n",
ip6_sprintf(&saddr6)));
goto bad;
}
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, icmp6len,);
nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
#else
IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
if (nd_ra == NULL) {
icmp6stat.icp6s_tooshort++;
return;
}
#endif
icmp6len -= sizeof(*nd_ra);
nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
if (nd6_options(&ndopts) < 0) {
nd6log((LOG_INFO,
"nd6_ra_input: invalid ND option, ignored\n"));
/* nd6_options have incremented stats */
goto freeit;
}
{
struct nd_defrouter dr0;
u_int32_t advreachable = nd_ra->nd_ra_reachable;
dr0.rtaddr = saddr6;
dr0.flags = nd_ra->nd_ra_flags_reserved;
dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
dr0.expire = time_second + dr0.rtlifetime;
dr0.ifp = ifp;
dr0.advint = 0; /* Mobile IPv6 */
dr0.advint_expire = 0; /* Mobile IPv6 */
dr0.advints_lost = 0; /* Mobile IPv6 */
/* unspecified or not? (RFC 2461 6.3.4) */
if (advreachable) {
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)
ndi->chlim = nd_ra->nd_ra_curhoplimit;
dr = defrtrlist_update(&dr0);
}
/*
* prefix
*/
if (ndopts.nd_opts_pi) {
struct nd_opt_hdr *pt;
struct nd_opt_prefix_info *pi = NULL;
struct nd_prefix pr;
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 *)((caddr_t)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,
"nd6_ra_input: 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,
"nd6_ra_input: 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,
"nd6_ra_input: invalid prefix "
"%s, ignored\n",
ip6_sprintf(&pi->nd_opt_pi_prefix)));
continue;
}
/* aggregatable unicast address, rfc2374 */
if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20
&& pi->nd_opt_pi_prefix_len != 64) {
nd6log((LOG_INFO,
"nd6_ra_input: invalid prefixlen "
"%d for rfc2374 prefix %s, ignored\n",
pi->nd_opt_pi_prefix_len,
ip6_sprintf(&pi->nd_opt_pi_prefix)));
continue;
}
bzero(&pr, sizeof(pr));
pr.ndpr_prefix.sin6_family = AF_INET6;
pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
pr.ndpr_pltime =
ntohl(pi->nd_opt_pi_preferred_time);
if (in6_init_prefix_ltimes(&pr))
continue; /* prefix lifetime init failed */
(void)prelist_update(&pr, dr, m);
}
}
/*
* MTU
*/
if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
/* lower bound */
if (mtu < IPV6_MMTU) {
nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
"mtu=%d sent from %s, ignoring\n",
mtu, ip6_sprintf(&ip6->ip6_src)));
goto skip;
}
/* upper bound */
if (ndi->maxmtu) {
if (mtu <= ndi->maxmtu) {
int change = (ndi->linkmtu != mtu);
ndi->linkmtu = mtu;
if (change) /* in6_maxmtu may change */
in6_setmaxmtu();
} else {
nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
"mtu=%d sent from %s; "
"exceeds maxmtu %d, ignoring\n",
mtu, ip6_sprintf(&ip6->ip6_src),
ndi->maxmtu));
}
} else {
nd6log((LOG_INFO, "nd6_ra_input: mtu option "
"mtu=%d sent from %s; maxmtu unknown, "
"ignoring\n",
mtu, ip6_sprintf(&ip6->ip6_src)));
}
}
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,
"nd6_ra_input: lladdrlen mismatch for %s "
"(if %d, RA packet %d)\n",
ip6_sprintf(&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.
*/
pfxlist_onlink_check();
}
freeit:
m_freem(m);
return;
bad:
icmp6stat.icp6s_badra++;
m_freem(m);
}
/*
* default router list proccessing sub routines
*/
/* tell the change to user processes watching the routing socket. */
static void
nd6_rtmsg(cmd, rt)
int cmd;
struct rtentry *rt;
{
struct rt_addrinfo info;
bzero((caddr_t)&info, sizeof(info));
info.rti_info[RTAX_DST] = rt_key(rt);
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
info.rti_info[RTAX_NETMASK] = rt_mask(rt);
info.rti_info[RTAX_IFP] =
(struct sockaddr *)TAILQ_FIRST(&rt->rt_ifp->if_addrlist);
info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
rt_missmsg(cmd, &info, rt->rt_flags, 0);
}
void
defrouter_addreq(new)
struct nd_defrouter *new;
{
struct sockaddr_in6 def, mask, gate;
struct rtentry *newrt = NULL;
int s;
Bzero(&def, sizeof(def));
Bzero(&mask, sizeof(mask));
Bzero(&gate, sizeof(gate));
def.sin6_len = mask.sin6_len = gate.sin6_len
= sizeof(struct sockaddr_in6);
def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
gate.sin6_addr = new->rtaddr;
s = splnet();
(void)rtrequest(RTM_ADD, (struct sockaddr *)&def,
(struct sockaddr *)&gate, (struct sockaddr *)&mask,
RTF_GATEWAY, &newrt);
if (newrt) {
nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
newrt->rt_refcnt--;
}
splx(s);
return;
}
/* Add a route to a given interface as default */
void
defrouter_addifreq(ifp)
struct ifnet *ifp;
{
struct sockaddr_in6 def, mask;
struct ifaddr *ifa;
struct rtentry *newrt = NULL;
int error, flags;
bzero(&def, sizeof(def));
bzero(&mask, sizeof(mask));
def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6);
def.sin6_family = mask.sin6_family = AF_INET6;
/*
* Search for an ifaddr beloging to the specified interface.
* XXX: An IPv6 address are required to be assigned on the interface.
*/
if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) {
nd6log((LOG_ERR, /* better error? */
"defrouter_addifreq: failed to find an ifaddr "
"to install a route to interface %s\n",
if_name(ifp)));
return;
}
flags = ifa->ifa_flags;
error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr,
(struct sockaddr *)&mask, flags, &newrt);
if (error != 0) {
nd6log((LOG_ERR,
"defrouter_addifreq: failed to install a route to "
"interface %s (errno = %d)\n",
if_name(ifp), error));
if (newrt) /* maybe unnecessary, but do it for safety */
newrt->rt_refcnt--;
} else {
if (newrt) {
nd6_rtmsg(RTM_ADD, newrt);
newrt->rt_refcnt--;
}
}
}
struct nd_defrouter *
defrouter_lookup(addr, ifp)
struct in6_addr *addr;
struct ifnet *ifp;
{
struct nd_defrouter *dr;
for (dr = TAILQ_FIRST(&nd_defrouter); dr;
dr = TAILQ_NEXT(dr, dr_entry)) {
if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
return(dr);
}
return(NULL); /* search failed */
}
void
defrouter_delreq(dr, dofree)
struct nd_defrouter *dr;
int dofree;
{
struct sockaddr_in6 def, mask, gate;
struct rtentry *oldrt = NULL;
Bzero(&def, sizeof(def));
Bzero(&mask, sizeof(mask));
Bzero(&gate, sizeof(gate));
def.sin6_len = mask.sin6_len = gate.sin6_len
= sizeof(struct sockaddr_in6);
def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
gate.sin6_addr = dr->rtaddr;
rtrequest(RTM_DELETE, (struct sockaddr *)&def,
(struct sockaddr *)&gate,
(struct sockaddr *)&mask,
RTF_GATEWAY, &oldrt);
if (oldrt) {
nd6_rtmsg(RTM_DELETE, oldrt);
RTFREE(oldrt);
}
if (dofree) /* XXX: necessary? */
free(dr, M_IP6NDP);
}
void
defrtrlist_del(dr)
struct nd_defrouter *dr;
{
struct nd_defrouter *deldr = NULL;
struct nd_prefix *pr;
/*
* Flush all the routing table entries that use the router
* as a next hop.
*/
if (!ip6_forwarding && ip6_accept_rtadv) {
/* above is a good condition? */
rt6_flush(&dr->rtaddr, dr->ifp);
}
if (dr == TAILQ_FIRST(&nd_defrouter))
deldr = dr; /* The router is primary. */
TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
/*
* Also delete all the pointers to the router in each prefix lists.
*/
for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
struct nd_pfxrouter *pfxrtr;
if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
pfxrtr_del(pfxrtr);
}
pfxlist_onlink_check();
/*
* If the router is the primary one, choose a new one.
* Note that defrouter_select() will remove the current gateway
* from the routing table.
*/
if (deldr)
defrouter_select();
free(dr, M_IP6NDP);
}
/*
* Default Router Selection according to Section 6.3.6 of RFC 2461:
* 1) Routers that are reachable or probably reachable should be
* preferred.
* 2) When no routers on the list are known to be reachable or
* probably reachable, routers SHOULD be selected in a round-robin
* fashion.
* 3) If the Default Router List is empty, assume that all
* destinations are on-link.
*/
void
defrouter_select()
{
int s = splnet();
struct nd_defrouter *dr, anydr;
struct rtentry *rt = NULL;
struct llinfo_nd6 *ln = NULL;
/*
* Search for a (probably) reachable router from the list.
*/
for (dr = TAILQ_FIRST(&nd_defrouter); dr;
dr = TAILQ_NEXT(dr, dr_entry)) {
if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
(ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
ND6_IS_LLINFO_PROBREACH(ln)) {
/* Got it, and move it to the head */
TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry);
break;
}
}
if ((dr = TAILQ_FIRST(&nd_defrouter))) {
/*
* De-install the previous default gateway and install
* a new one.
* Note that if there is no reachable router in the list,
* the head entry will be used anyway.
* XXX: do we have to check the current routing table entry?
*/
bzero(&anydr, sizeof(anydr));
defrouter_delreq(&anydr, 0);
defrouter_addreq(dr);
}
else {
/*
* The Default Router List is empty, so install the default
* route to an inteface.
* XXX: The specification does not say this mechanism should
* be restricted to hosts, but this would be not useful
* (even harmful) for routers.
*/
if (!ip6_forwarding) {
/*
* De-install the current default route
* in advance.
*/
bzero(&anydr, sizeof(anydr));
defrouter_delreq(&anydr, 0);
if (nd6_defifp) {
/*
* Install a route to the default interface
* as default route.
* XXX: we enable this for host only, because
* this may override a default route installed
* a user process (e.g. routing daemon) in a
* router case.
*/
defrouter_addifreq(nd6_defifp);
} else {
nd6log((LOG_INFO, "defrouter_select: "
"there's no default router and no default"
" interface\n"));
}
}
}
splx(s);
return;
}
static struct nd_defrouter *
defrtrlist_update(new)
struct nd_defrouter *new;
{
struct nd_defrouter *dr, *n;
int s = splnet();
if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
/* entry exists */
if (new->rtlifetime == 0) {
defrtrlist_del(dr);
dr = NULL;
} else {
/* override */
dr->flags = new->flags; /* xxx flag check */
dr->rtlifetime = new->rtlifetime;
dr->expire = new->expire;
}
splx(s);
return(dr);
}
/* entry does not exist */
if (new->rtlifetime == 0) {
splx(s);
return(NULL);
}
n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
if (n == NULL) {
splx(s);
return(NULL);
}
bzero(n, sizeof(*n));
*n = *new;
/*
* Insert the new router at the end of the Default Router List.
* If there is no other router, install it anyway. Otherwise,
* just continue to use the current default router.
*/
TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
if (TAILQ_FIRST(&nd_defrouter) == n)
defrouter_select();
splx(s);
return(n);
}
static struct nd_pfxrouter *
pfxrtr_lookup(pr, dr)
struct nd_prefix *pr;
struct nd_defrouter *dr;
{
struct nd_pfxrouter *search;
for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
if (search->router == dr)
break;
}
return(search);
}
static void
pfxrtr_add(pr, dr)
struct nd_prefix *pr;
struct nd_defrouter *dr;
{
struct nd_pfxrouter *new;
new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
if (new == NULL)
return;
bzero(new, sizeof(*new));
new->router = dr;
LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
pfxlist_onlink_check();
}
static void
pfxrtr_del(pfr)
struct nd_pfxrouter *pfr;
{
LIST_REMOVE(pfr, pfr_entry);
free(pfr, M_IP6NDP);
}
struct nd_prefix *
nd6_prefix_lookup(pr)
struct nd_prefix *pr;
{
struct nd_prefix *search;
for (search = nd_prefix.lh_first; search; search = search->ndpr_next) {
if (pr->ndpr_ifp == search->ndpr_ifp &&
pr->ndpr_plen == search->ndpr_plen &&
in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
&search->ndpr_prefix.sin6_addr,
pr->ndpr_plen)
) {
break;
}
}
return(search);
}
int
nd6_prelist_add(pr, dr, newp)
struct nd_prefix *pr, **newp;
struct nd_defrouter *dr;
{
struct nd_prefix *new = NULL;
int i, s;
new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
if (new == NULL)
return ENOMEM;
bzero(new, sizeof(*new));
*new = *pr;
if (newp != NULL)
*newp = new;
/* initilization */
LIST_INIT(&new->ndpr_advrtrs);
in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
/* make prefix in the canonical form */
for (i = 0; i < 4; i++)
new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
new->ndpr_mask.s6_addr32[i];
s = splnet();
/* link ndpr_entry to nd_prefix list */
LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
splx(s);
/* ND_OPT_PI_FLAG_ONLINK processing */
if (new->ndpr_raf_onlink) {
int e;
if ((e = nd6_prefix_onlink(new)) != 0) {
nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
"the prefix %s/%d on-link on %s (errno=%d)\n",
ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
/* proceed anyway. XXX: is it correct? */
}
}
if (dr) {
pfxrtr_add(new, dr);
}
return 0;
}
void
prelist_remove(pr)
struct nd_prefix *pr;
{
struct nd_pfxrouter *pfr, *next;
int e, s;
/* 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) {
nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
"on %s, errno=%d\n",
ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
/* what should we do? */
}
if (pr->ndpr_refcnt > 0)
return; /* notice here? */
s = splnet();
/* unlink ndpr_entry from nd_prefix list */
LIST_REMOVE(pr, ndpr_entry);
/* free list of routers that adversed the prefix */
for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
next = pfr->pfr_next;
free(pfr, M_IP6NDP);
}
splx(s);
free(pr, M_IP6NDP);
pfxlist_onlink_check();
}
int
prelist_update(new, dr, m)
struct nd_prefix *new;
struct nd_defrouter *dr; /* may be NULL */
struct mbuf *m;
{
struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
struct ifaddr *ifa;
struct ifnet *ifp = new->ndpr_ifp;
struct nd_prefix *pr;
int s = splnet();
int error = 0;
int newprefix = 0;
int auth;
struct in6_addrlifetime lt6_tmp;
auth = 0;
if (m) {
/*
* Authenticity for NA consists authentication for
* both IP header and IP datagrams, doesn't it ?
*/
#if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
auth = (m->m_flags & M_AUTHIPHDR
&& m->m_flags & M_AUTHIPDGM) ? 1 : 0;
#endif
}
if ((pr = nd6_prefix_lookup(new)) != NULL) {
/*
* nd6_prefix_lookup() ensures that pr and new 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 (new->ndpr_raf_onlink == 1)
pr->ndpr_raf_onlink = 1;
if (new->ndpr_raf_auto == 1)
pr->ndpr_raf_auto = 1;
if (new->ndpr_raf_onlink) {
pr->ndpr_vltime = new->ndpr_vltime;
pr->ndpr_pltime = new->ndpr_pltime;
pr->ndpr_preferred = new->ndpr_preferred;
pr->ndpr_expire = new->ndpr_expire;
}
if (new->ndpr_raf_onlink &&
(pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
int e;
if ((e = nd6_prefix_onlink(pr)) != 0) {
nd6log((LOG_ERR,
"prelist_update: failed to make "
"the prefix %s/%d on-link on %s "
"(errno=%d)\n",
ip6_sprintf(&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;
newprefix = 1;
if (new->ndpr_vltime == 0)
goto end;
if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
goto end;
bzero(&new->ndpr_addr, sizeof(struct in6_addr));
error = nd6_prelist_add(new, dr, &newpr);
if (error != 0 || newpr == NULL) {
nd6log((LOG_NOTICE, "prelist_update: "
"nd6_prelist_add failed for %s/%d on %s "
"errno=%d, returnpr=%p\n",
ip6_sprintf(&new->ndpr_prefix.sin6_addr),
new->ndpr_plen, if_name(new->ndpr_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 suret 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 (!new->ndpr_raf_auto)
goto afteraddrconf;
/*
* 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.
* This should have been done in nd6_ra_input.
*/
/*
* 5.5.3 (d). If the prefix advertised does not match the prefix of an
* address already in the list, and the Valid Lifetime is not 0,
* form an address. Note that even a manually configured address
* should reject autoconfiguration of a new address.
*/
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
{
struct in6_ifaddr *ifa6;
int ifa_plen;
u_int32_t storedlifetime;
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ifa6 = (struct in6_ifaddr *)ifa;
/*
* 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 ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
continue;
ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL);
if (ifa_plen != new->ndpr_plen ||
!in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr,
&new->ndpr_prefix.sin6_addr,
ifa_plen))
continue;
if (ia6_match == NULL) /* remember the first one */
ia6_match = ifa6;
if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
continue;
/*
* 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.
*/
#define TWOHOUR (120*60)
lt6_tmp = ifa6->ia6_lifetime;
if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
storedlifetime = ND6_INFINITE_LIFETIME;
else if (IFA6_IS_INVALID(ifa6))
storedlifetime = 0;
else
storedlifetime = lt6_tmp.ia6t_expire - time_second;
/* when not updating, keep the current stored lifetime. */
lt6_tmp.ia6t_vltime = storedlifetime;
if (TWOHOUR < new->ndpr_vltime ||
storedlifetime < new->ndpr_vltime) {
lt6_tmp.ia6t_vltime = new->ndpr_vltime;
} else if (storedlifetime <= TWOHOUR
#if 0
/*
* This condition is logically redundant, so we just
* omit it.
* See IPng 6712, 6717, and 6721.
*/
&& new->ndpr_vltime <= storedlifetime
#endif
) {
if (auth) {
lt6_tmp.ia6t_vltime = new->ndpr_vltime;
}
} else {
/*
* new->ndpr_vltime <= TWOHOUR &&
* TWOHOUR < storedlifetime
*/
lt6_tmp.ia6t_vltime = TWOHOUR;
}
/* The 2 hour rule is not imposed for preferred lifetime. */
lt6_tmp.ia6t_pltime = new->ndpr_pltime;
in6_init_address_ltimes(pr, &lt6_tmp);
/*
* When adjusting the lifetimes of an existing temporary
* address, only lower the lifetimes.
* RFC 3041 3.3. (1).
* XXX: how should we modify ia6t_[pv]ltime?
*/
if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
if (lt6_tmp.ia6t_expire == 0 || /* no expire */
lt6_tmp.ia6t_expire >
ifa6->ia6_lifetime.ia6t_expire) {
lt6_tmp.ia6t_expire =
ifa6->ia6_lifetime.ia6t_expire;
}
if (lt6_tmp.ia6t_preferred == 0 || /* no expire */
lt6_tmp.ia6t_preferred >
ifa6->ia6_lifetime.ia6t_preferred) {
lt6_tmp.ia6t_preferred =
ifa6->ia6_lifetime.ia6t_preferred;
}
}
ifa6->ia6_lifetime = lt6_tmp;
}
if (ia6_match == NULL && new->ndpr_vltime) {
/*
* No address matched and the valid lifetime is non-zero.
* Create a new address.
*/
if ((ia6 = in6_ifadd(new, NULL)) != NULL) {
/*
* note that we should use pr (not new) for reference.
*/
pr->ndpr_refcnt++;
ia6->ia6_ndpr = pr;
#if 0
/* XXXYYY Don't do this, according to Jinmei. */
pr->ndpr_addr = new->ndpr_addr;
#endif
/*
* RFC 3041 3.3 (2).
* When a new public address is created as described
* in RFC2462, also create a new temporary address.
*
* RFC 3041 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)) != 0) {
nd6log((LOG_NOTICE, "prelist_update: "
"failed to create a temporary "
"address, errno=%d\n",
e));
}
}
/*
* A newly added address might affect the status
* of other addresses, so we check and update it.
* XXX: what if address duplication happens?
*/
pfxlist_onlink_check();
} else {
/* just set an error. do not bark here. */
error = EADDRNOTAVAIL; /* XXX: might be unused. */
}
}
afteraddrconf:
end:
splx(s);
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(pr)
struct nd_prefix *pr;
{
struct nd_pfxrouter *pfxrtr;
struct rtentry *rt;
struct llinfo_nd6 *ln;
for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr;
pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0,
pfxrtr->router->ifp)) &&
(ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
ND6_IS_LLINFO_PROBREACH(ln))
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
pfxlist_onlink_check()
{
struct nd_prefix *pr;
struct in6_ifaddr *ifa;
/*
* Check if there is a prefix that has a reachable advertising
* router.
*/
for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
break;
}
if (pr) {
/*
* There is at least one prefix that has a reachable router.
* Detach prefixes which have no reachable advertising
* router, and attach other prefixes.
*/
for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
/* 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 */
for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
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.
*/
for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
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,
"pfxlist_onlink_check: failed to "
"make %s/%d offlink, errno=%d\n",
ip6_sprintf(&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,
"pfxlist_onlink_check: failed to "
"make %s/%d offlink, errno=%d\n",
ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, e));
}
}
}
/*
* 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.
*/
for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
continue;
if (ifa->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;
}
if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
break;
}
if (ifa) {
for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
continue;
if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
continue;
if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
ifa->ia6_flags &= ~IN6_IFF_DETACHED;
else
ifa->ia6_flags |= IN6_IFF_DETACHED;
}
}
else {
for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
continue;
ifa->ia6_flags &= ~IN6_IFF_DETACHED;
}
}
}
int
nd6_prefix_onlink(pr)
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 rtentry *rt = NULL;
/* sanity check */
if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
nd6log((LOG_ERR,
"nd6_prefix_onlink: %s/%d is already on-link\n",
ip6_sprintf(&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.
*/
for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
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 */
ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
IN6_IFF_NOTREADY|
IN6_IFF_ANYCAST);
if (ifa == NULL) {
/* XXX: freebsd does not have ifa_ifwithaf */
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
{
if (ifa->ifa_addr->sa_family == AF_INET6)
break;
}
/* 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,
"nd6_prefix_onlink: failed to find any ifaddr"
" to add route for a prefix(%s/%d) on %s\n",
ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, if_name(ifp)));
return(0);
}
/*
* in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
* ifa->ifa_rtrequest = nd6_rtrequest;
*/
bzero(&mask6, sizeof(mask6));
mask6.sin6_len = sizeof(mask6);
mask6.sin6_addr = pr->ndpr_mask;
rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP;
if (nd6_need_cache(ifp)) {
/* explicitly set in case ifa_flags does not set the flag. */
rtflags |= RTF_CLONING;
} else {
/*
* explicitly clear the cloning bit in case ifa_flags sets it.
*/
rtflags &= ~RTF_CLONING;
}
error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
ifa->ifa_addr, (struct sockaddr *)&mask6,
rtflags, &rt);
if (error == 0) {
if (rt != NULL) /* this should be non NULL, though */
nd6_rtmsg(RTM_ADD, rt);
pr->ndpr_stateflags |= NDPRF_ONLINK;
}
else {
nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
" prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
"errno = %d\n",
ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, if_name(ifp),
ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
ip6_sprintf(&mask6.sin6_addr), rtflags, error));
}
if (rt != NULL)
rt->rt_refcnt--;
return(error);
}
int
nd6_prefix_offlink(pr)
struct nd_prefix *pr;
{
int error = 0;
struct ifnet *ifp = pr->ndpr_ifp;
struct nd_prefix *opr;
struct sockaddr_in6 sa6, mask6;
struct rtentry *rt = NULL;
/* sanity check */
if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
nd6log((LOG_ERR,
"nd6_prefix_offlink: %s/%d is already off-link\n",
ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen));
return(EEXIST);
}
bzero(&sa6, sizeof(sa6));
sa6.sin6_family = AF_INET6;
sa6.sin6_len = sizeof(sa6);
bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
sizeof(struct in6_addr));
bzero(&mask6, sizeof(mask6));
mask6.sin6_family = AF_INET6;
mask6.sin6_len = sizeof(sa6);
bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
(struct sockaddr *)&mask6, 0, &rt);
if (error == 0) {
pr->ndpr_stateflags &= ~NDPRF_ONLINK;
/* report the route deletion to the routing socket. */
if (rt != NULL)
nd6_rtmsg(RTM_DELETE, rt);
/*
* 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.
*/
for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
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,
"nd6_prefix_offlink: failed to "
"recover a prefix %s/%d from %s "
"to %s (errno = %d)\n",
ip6_sprintf(&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,
"nd6_prefix_offlink: failed to delete route: "
"%s/%d on %s (errno = %d)\n",
ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp),
error));
}
if (rt != NULL)
RTFREE(rt);
return(error);
}
static struct in6_ifaddr *
in6_ifadd(pr, ifid)
struct nd_prefix *pr;
struct in6_addr *ifid; /* Mobile IPv6 addition */
{
struct ifnet *ifp = pr->ndpr_ifp;
struct ifaddr *ifa;
struct in6_aliasreq ifra;
struct in6_ifaddr *ia, *ib;
int error, plen0;
struct in6_addr mask;
int prefixlen = pr->ndpr_plen;
in6_len2mask(&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.
*
* Mobile IPv6 addition: allow for caller to specify a wished interface
* ID. This is to not break connections when moving addresses between
* interfaces.
*/
ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */
if (ifa)
ib = (struct in6_ifaddr *)ifa;
else
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, "in6_ifadd: wrong prefixlen for %s "
"(prefix=%d ifid=%d)\n",
if_name(ifp), prefixlen, 128 - plen0));
return NULL;
}
/* make ifaddr */
bzero(&ifra, 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));
ifra.ifra_addr.sin6_family = AF_INET6;
ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
/* prefix */
bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr,
sizeof(ifra.ifra_addr.sin6_addr));
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 */
if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid))
ifid = &ib->ia_addr.sin6_addr;
ifra.ifra_addr.sin6_addr.s6_addr32[0]
|= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]);
ifra.ifra_addr.sin6_addr.s6_addr32[1]
|= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]);
ifra.ifra_addr.sin6_addr.s6_addr32[2]
|= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]);
ifra.ifra_addr.sin6_addr.s6_addr32[3]
|= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]);
/* new prefix mask. */
ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
ifra.ifra_prefixmask.sin6_family = AF_INET6;
bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
sizeof(ifra.ifra_prefixmask.sin6_addr));
/*
* lifetime.
* XXX: in6_init_address_ltimes would override these values later.
* We should reconsider this logic.
*/
ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
/* XXX: scope zone ID? */
ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
/*
* temporarily set the nopfx flag to avoid conflict.
* XXX: we should reconsider the entire mechanism about prefix
* manipulation.
*/
ifra.ifra_flags |= IN6_IFF_NOPFX;
/*
* keep the new address, regardless of the result of in6_update_ifa.
* XXX: this address is now meaningless.
* We should reconsider its role.
*/
pr->ndpr_addr = ifra.ifra_addr.sin6_addr;
/* allocate ifaddr structure, link into chain, etc. */
if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
nd6log((LOG_ERR,
"in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp),
error));
return(NULL); /* ifaddr must not have been allocated. */
}
ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
return(ia); /* this must NOT be NULL. */
}
int
in6_tmpifadd(ia0, forcegen)
const struct in6_ifaddr *ia0; /* corresponding public address */
int forcegen;
{
struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
struct in6_ifaddr *newia;
struct in6_aliasreq ifra;
int i, error;
int trylimit = 3; /* XXX: adhoc value */
u_int32_t randid[2];
time_t vltime0, pltime0;
bzero(&ifra, 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:
in6_get_tmpifid(ifp, (u_int8_t *)randid,
(const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8],
forcegen);
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]));
/*
* If by chance the new temporary address is the same as an address
* already assigned to the interface, generate a new randomized
* interface identifier and repeat this step.
* RFC 3041 3.3 (4).
*/
if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) {
if (trylimit-- == 0) {
nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find "
"a unique random IFID\n"));
return(EEXIST);
}
forcegen = 1;
goto again;
}
/*
* 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_expire != 0) {
vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
(ia0->ia6_lifetime.ia6t_expire - time_second);
if (vltime0 > ip6_temp_valid_lifetime)
vltime0 = ip6_temp_valid_lifetime;
} else
vltime0 = ip6_temp_valid_lifetime;
if (ia0->ia6_lifetime.ia6t_preferred != 0) {
pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
(ia0->ia6_lifetime.ia6t_preferred - time_second);
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. */
if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0)
return(error);
newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
if (newia == NULL) { /* XXX: can it happen? */
nd6log((LOG_ERR,
"in6_tmpifadd: ifa update succeeded, but we got "
"no ifaddr\n"));
return(EINVAL); /* XXX */
}
newia->ia6_ndpr = ia0->ia6_ndpr;
newia->ia6_ndpr->ndpr_refcnt++;
/*
* 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.
*/
pfxlist_onlink_check();
return(0);
}
int
in6_init_prefix_ltimes(struct nd_prefix *ndpr)
{
/* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
nd6log((LOG_INFO, "in6_init_prefix_ltimes: 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_second + ndpr->ndpr_pltime;
if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
ndpr->ndpr_expire = 0;
else
ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
return 0;
}
static void
in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
{
/* init ia6t_expire */
if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
lt6->ia6t_expire = 0;
else {
lt6->ia6t_expire = time_second;
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_second;
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
rt6_flush(gateway, ifp)
struct in6_addr *gateway;
struct ifnet *ifp;
{
struct radix_node_head *rnh = rt_tables[AF_INET6];
int s = splnet();
/* We'll care only link-local addresses */
if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
splx(s);
return;
}
/* XXX: hack for KAME's link-local address kludge */
gateway->s6_addr16[1] = htons(ifp->if_index);
RADIX_NODE_HEAD_LOCK(rnh);
rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
RADIX_NODE_HEAD_UNLOCK(rnh);
splx(s);
}
static int
rt6_deleteroute(rn, arg)
struct radix_node *rn;
void *arg;
{
#define SIN6(s) ((struct sockaddr_in6 *)s)
struct rtentry *rt = (struct rtentry *)rn;
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, &SIN6(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(rtrequest(RTM_DELETE, rt_key(rt),
rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0));
#undef SIN6
}
int
nd6_setdefaultiface(ifindex)
int ifindex;
{
int error = 0;
if (ifindex < 0 || if_index < ifindex)
return(EINVAL);
if (nd6_defifindex != ifindex) {
nd6_defifindex = ifindex;
if (nd6_defifindex > 0)
nd6_defifp = ifnet_byindex(nd6_defifindex);
else
nd6_defifp = NULL;
/*
* If the Default Router List is empty, install a route
* to the specified interface as default or remove the default
* route when the default interface becomes canceled.
* The check for the queue is actually redundant, but
* we do this here to avoid re-install the default route
* if the list is NOT empty.
*/
if (TAILQ_FIRST(&nd_defrouter) == NULL)
defrouter_select();
/*
* Our current implementation assumes one-to-one maping between
* interfaces and links, so it would be natural to use the
* default interface as the default link.
*/
scope6_setdefault(nd6_defifp);
}
return(error);
}
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