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freebsd-dev/sys/netinet6/nd6_rtr.c
Poul-Henning Kamp eb95c536ad Remove unneeded #include <sys/kernel.h>
2000-04-29 15:36:14 +00:00

1243 lines
32 KiB
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/*
* 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.
*
* $FreeBSD$
*/
#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/errno.h>
#include <sys/syslog.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/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/icmp6.h>
#include <net/net_osdep.h>
#define SDL(s) ((struct sockaddr_dl *)s)
static struct nd_defrouter *defrtrlist_update __P((struct nd_defrouter *));
static int prelist_add __P((struct nd_prefix *, struct nd_defrouter *));
static struct nd_prefix *prefix_lookup __P((struct nd_prefix *));
static struct in6_ifaddr *in6_ifadd __P((struct ifnet *, struct in6_addr *,
struct in6_addr *, int));
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 void pfxlist_onlink_check __P((void));
static void nd6_detach_prefix __P((struct nd_prefix *));
static void nd6_attach_prefix __P((struct nd_prefix *));
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;
/*
* 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 nd_router_solicit *)((caddr_t)ip6 + off);
struct in6_addr saddr6 = ip6->ip6_src;
char *lladdr = NULL;
int lladdrlen = 0;
union nd_opts ndopts;
/* If I'm not a router, ignore it. */
if (ip6_accept_rtadv != 0 || ip6_forwarding != 1)
return;
/* Sanity checks */
if (ip6->ip6_hlim != 255) {
log(LOG_ERR,
"nd6_rs_input: invalid hlim %d\n", ip6->ip6_hlim);
return;
}
/*
* 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))
return;
icmp6len -= sizeof(*nd_rs);
nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
if (nd6_options(&ndopts) < 0) {
log(LOG_INFO, "nd6_rs_input: invalid ND option, ignored\n");
return;
}
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) {
log(LOG_INFO,
"nd6_rs_input: lladdrlen mismatch for %s "
"(if %d, RS packet %d)\n",
ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2);
}
nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
}
/*
* 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 nd_router_advert *)((caddr_t)ip6 + off);
struct in6_addr saddr6 = ip6->ip6_src;
union nd_opts ndopts;
struct nd_defrouter *dr;
if (ip6_accept_rtadv == 0)
return;
if (ip6->ip6_hlim != 255) {
log(LOG_ERR,
"nd6_ra_input: invalid hlim %d\n", ip6->ip6_hlim);
return;
}
if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
log(LOG_ERR,
"nd6_ra_input: src %s is not link-local\n",
ip6_sprintf(&saddr6));
return;
}
icmp6len -= sizeof(*nd_ra);
nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
if (nd6_options(&ndopts) < 0) {
log(LOG_INFO, "nd6_ra_input: invalid ND option, ignored\n");
return;
}
{
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;
/* 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)
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;
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) {
log(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) {
log(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)) {
log(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) {
log(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) {
log(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 {
log(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 {
log(LOG_INFO, "nd6_ra_input: mtu option "
"mtu=%d sent from %s; maxmtu unknown, "
"ignoring\n",
mtu, ip6_sprintf(&ip6->ip6_src));
}
}
skip:
/*
* Src linkaddress
*/
{
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) {
log(LOG_INFO,
"nd6_ra_input: lladdrlen mismatch for %s "
"(if %d, RA packet %d)\n",
ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2);
}
nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0);
}
}
/*
* default router list proccessing sub routines
*/
void
defrouter_addreq(new)
struct nd_defrouter *new;
{
struct sockaddr_in6 def, mask, gate;
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, NULL);
splx(s);
return;
}
struct nd_defrouter *
defrouter_lookup(addr, ifp)
struct in6_addr *addr;
struct ifnet *ifp;
{
struct nd_defrouter *dr;
LIST_FOREACH(dr, &nd_defrouter, 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;
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, (struct rtentry **)0);
if (dofree)
free(dr, M_IP6NDP);
if (!LIST_EMPTY(&nd_defrouter))
defrouter_addreq(LIST_FIRST(&nd_defrouter));
/*
* xxx update the Destination Cache entries for all
* destinations using that neighbor as a router (7.2.5)
*/
}
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 == LIST_FIRST(&nd_defrouter))
deldr = dr; /* The router is primary. */
LIST_REMOVE(dr, dr_entry);
/*
* Also delete all the pointers to the router in each prefix lists.
*/
LIST_FOREACH(pr, &nd_prefix, ndpr_entry) {
struct nd_pfxrouter *pfxrtr;
if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
pfxrtr_del(pfxrtr);
}
pfxlist_onlink_check();
/*
* If the router is the primary one, delete the default route
* entry in the routing table.
*/
if (deldr)
defrouter_delreq(deldr, 0);
free(dr, M_IP6NDP);
}
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;
if (LIST_EMPTY(&nd_defrouter)) {
LIST_INSERT_HEAD(&nd_defrouter, n, dr_entry);
defrouter_addreq(n);
} else {
LIST_INSERT_AFTER(LIST_FIRST(&nd_defrouter), n, dr_entry);
defrouter_addreq(n);
}
splx(s);
return(n);
}
static struct nd_pfxrouter *
pfxrtr_lookup(pr, dr)
struct nd_prefix *pr;
struct nd_defrouter *dr;
{
struct nd_pfxrouter *search;
LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) {
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);
}
static struct nd_prefix *
prefix_lookup(pr)
struct nd_prefix *pr;
{
struct nd_prefix *search;
LIST_FOREACH(search, &nd_prefix, ndpr_entry) {
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);
}
static int
prelist_add(pr, dr)
struct nd_prefix *pr;
struct nd_defrouter *dr;
{
struct nd_prefix *new;
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;
/* initilization */
new->ndpr_statef_onlink = pr->ndpr_statef_onlink;
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];
/* xxx ND_OPT_PI_FLAG_ONLINK processing */
s = splnet();
/* link ndpr_entry to nd_prefix list */
LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
splx(s);
if (dr)
pfxrtr_add(new, dr);
return 0;
}
void
prelist_remove(pr)
struct nd_prefix *pr;
{
struct nd_pfxrouter *pfr, *next;
int s;
s = splnet();
/* unlink ndpr_entry from nd_prefix list */
LIST_REMOVE(pr, ndpr_entry);
splx(s);
/* free list of routers that adversed the prefix */
for (pfr = LIST_FIRST(&pr->ndpr_advrtrs); pfr; pfr = next) {
next = LIST_NEXT(pfr, pfr_entry);
free(pfr, M_IP6NDP);
}
free(pr, M_IP6NDP);
pfxlist_onlink_check();
}
/*
* NOTE: We set address lifetime to keep
* address lifetime <= prefix lifetime
* invariant. This is to simplify on-link determination code.
* If onlink determination is udated, this routine may have to be updated too.
*/
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;
struct nd_prefix *pr;
int s = splnet();
int error = 0;
int auth;
struct in6_addrlifetime *lt6;
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 = prefix_lookup(new)) != NULL) {
if (pr->ndpr_ifp != new->ndpr_ifp) {
error = EADDRNOTAVAIL;
goto end;
}
/* update prefix information */
pr->ndpr_flags = new->ndpr_flags;
pr->ndpr_vltime = new->ndpr_vltime;
pr->ndpr_pltime = new->ndpr_pltime;
pr->ndpr_preferred = new->ndpr_preferred;
pr->ndpr_expire = new->ndpr_expire;
/*
* RFC 2462 5.5.3 (d) or (e)
* We got a prefix which we have seen in the past.
*/
if (!new->ndpr_raf_auto)
goto noautoconf1;
if (IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr))
ia6 = NULL;
else
ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr);
if (ia6 == NULL) {
/*
* Special case:
* (1) We have seen the prefix advertised before, but
* we have never performed autoconfig for this prefix.
* This is because Autonomous bit was 0 previously, or
* autoconfig failed due to some other reasons.
* (2) We have seen the prefix advertised before and
* we have performed autoconfig in the past, but
* we seem to have no interface address right now.
* This is because the interface address have expired.
*
* This prefix is fresh, with respect to autoconfig
* process.
*
* Add an address based on RFC 2462 5.5.3 (d).
*/
ia6 = in6_ifadd(pr->ndpr_ifp,
&pr->ndpr_prefix.sin6_addr, &pr->ndpr_addr,
new->ndpr_plen);
if (!ia6) {
error = EADDRNOTAVAIL;
log(LOG_ERR, "prelist_update: failed to add a "
"new address\n");
goto noautoconf1;
}
lt6 = &ia6->ia6_lifetime;
/* address lifetime <= prefix lifetime */
lt6->ia6t_vltime = new->ndpr_vltime;
lt6->ia6t_pltime = new->ndpr_pltime;
in6_init_address_ltimes(new, lt6);
} else {
#define TWOHOUR (120*60)
/*
* We have seen the prefix before, and we have added
* interface address in the past. We still have
* the interface address assigned.
*
* update address lifetime based on RFC 2462
* 5.5.3 (e).
*/
int update = 0;
lt6 = &ia6->ia6_lifetime;
/*
* update to RFC 2462 5.5.3 (e) from Jim Bound,
* (ipng 6712)
*/
if (TWOHOUR < new->ndpr_vltime
|| lt6->ia6t_vltime < new->ndpr_vltime) {
lt6->ia6t_vltime = new->ndpr_vltime;
update++;
} else if (auth) {
lt6->ia6t_vltime = new->ndpr_vltime;
update++;
}
/* jim bound rule is not imposed for pref lifetime */
lt6->ia6t_pltime = new->ndpr_pltime;
update++;
if (update)
in6_init_address_ltimes(new, lt6);
}
noautoconf1:
if (dr && pfxrtr_lookup(pr, dr) == NULL)
pfxrtr_add(pr, dr);
} else {
int error_tmp;
if (new->ndpr_vltime == 0) goto end;
bzero(&new->ndpr_addr, sizeof(struct in6_addr));
/*
* RFC 2462 5.5.3 (d)
* We got a fresh prefix. Perform some sanity checks
* and add an interface address by appending interface ID
* to the advertised prefix.
*/
if (!new->ndpr_raf_auto)
goto noautoconf2;
ia6 = in6_ifadd(new->ndpr_ifp, &new->ndpr_prefix.sin6_addr,
&new->ndpr_addr, new->ndpr_plen);
if (!ia6) {
error = EADDRNOTAVAIL;
log(LOG_ERR, "prelist_update: "
"failed to add a new address\n");
goto noautoconf2;
}
/* set onlink bit if an interface route is configured */
new->ndpr_statef_onlink = (ia6->ia_flags & IFA_ROUTE) ? 1 : 0;
lt6 = &ia6->ia6_lifetime;
/* address lifetime <= prefix lifetime */
lt6->ia6t_vltime = new->ndpr_vltime;
lt6->ia6t_pltime = new->ndpr_pltime;
in6_init_address_ltimes(new, lt6);
noautoconf2:
error_tmp = prelist_add(new, dr);
error = error_tmp ? error_tmp : error;
}
end:
splx(s);
return error;
}
/*
* Check if each prefix in the prefix list has at least one available router
* that advertised the prefix.
* 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
* been 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 availble 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.
*/
static void
pfxlist_onlink_check()
{
struct nd_prefix *pr;
LIST_FOREACH(pr, &nd_prefix, ndpr_entry)
if (!LIST_EMPTY(&pr->ndpr_advrtrs)) /* pr has an available router */
break;
if (pr) {
/*
* There is at least one prefix that has a router. First,
* detach prefixes which has no advertising router and then
* attach other prefixes. The order is important since an
* attached prefix and a detached prefix may have a same
* interface route.
*/
LIST_FOREACH(pr, &nd_prefix, ndpr_entry) {
if (LIST_EMPTY(&pr->ndpr_advrtrs) &&
pr->ndpr_statef_onlink) {
pr->ndpr_statef_onlink = 0;
nd6_detach_prefix(pr);
}
}
LIST_FOREACH(pr, &nd_prefix, ndpr_entry) {
if (!LIST_EMPTY(&pr->ndpr_advrtrs) &&
pr->ndpr_statef_onlink == 0)
nd6_attach_prefix(pr);
}
} else {
/* there is no prefix that has a router */
LIST_FOREACH(pr, &nd_prefix, ndpr_entry)
if (pr->ndpr_statef_onlink == 0)
nd6_attach_prefix(pr);
}
}
static void
nd6_detach_prefix(pr)
struct nd_prefix *pr;
{
struct in6_ifaddr *ia6;
struct sockaddr_in6 sa6, mask6;
/*
* Delete the interface route associated with the prefix.
*/
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));
{
int e;
e = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
(struct sockaddr *)&mask6, 0, NULL);
if (e) {
log(LOG_ERR,
"nd6_detach_prefix: failed to delete route: "
"%s/%d (errno = %d)\n",
ip6_sprintf(&sa6.sin6_addr),
pr->ndpr_plen,
e);
}
}
/*
* Mark the address derived from the prefix detached so that
* it won't be used as a source address for a new connection.
*/
if (IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr))
ia6 = NULL;
else
ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr);
if (ia6)
ia6->ia6_flags |= IN6_IFF_DETACHED;
}
static void
nd6_attach_prefix(pr)
struct nd_prefix *pr;
{
struct ifaddr *ifa;
struct in6_ifaddr *ia6;
/*
* Add the interface route associated with the prefix(if necessary)
* Should we consider if the L bit is set in pr->ndpr_flags?
*/
ifa = ifaof_ifpforaddr((struct sockaddr *)&pr->ndpr_prefix,
pr->ndpr_ifp);
if (ifa == NULL) {
log(LOG_ERR,
"nd6_attach_prefix: failed to find any ifaddr"
" to add route for a prefix(%s/%d)\n",
ip6_sprintf(&pr->ndpr_addr), pr->ndpr_plen);
} else {
int e;
struct sockaddr_in6 mask6;
bzero(&mask6, sizeof(mask6));
mask6.sin6_family = AF_INET6;
mask6.sin6_len = sizeof(mask6);
mask6.sin6_addr = pr->ndpr_mask;
e = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
ifa->ifa_addr, (struct sockaddr *)&mask6,
ifa->ifa_flags, NULL);
if (e == 0)
pr->ndpr_statef_onlink = 1;
else {
log(LOG_ERR,
"nd6_attach_prefix: failed to add route for"
" a prefix(%s/%d), errno = %d\n",
ip6_sprintf(&pr->ndpr_addr), pr->ndpr_plen, e);
}
}
/*
* Now the address derived from the prefix can be used as a source
* for a new connection, so clear the detached flag.
*/
if (IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr))
ia6 = NULL;
else
ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr);
if (ia6) {
ia6->ia6_flags &= ~IN6_IFF_DETACHED;
if (pr->ndpr_statef_onlink)
ia6->ia_flags |= IFA_ROUTE;
}
}
static struct in6_ifaddr *
in6_ifadd(ifp, in6, addr, prefixlen)
struct ifnet *ifp;
struct in6_addr *in6;
struct in6_addr *addr;
int prefixlen; /* prefix len of the new prefix in "in6" */
{
struct ifaddr *ifa;
struct in6_ifaddr *ia, *ib, *oia;
int s, error;
struct in6_addr mask;
in6_len2mask(&mask, prefixlen);
/* find link-local address (will be interface ID) */
ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp);
if (ifa)
ib = (struct in6_ifaddr *)ifa;
else
return NULL;
/* prefixlen + ifidlen must be equal to 128 */
if (prefixlen != in6_mask2len(&ib->ia_prefixmask.sin6_addr)) {
log(LOG_ERR, "in6_ifadd: wrong prefixlen for %s"
"(prefix=%d ifid=%d)\n", if_name(ifp),
prefixlen,
128 - in6_mask2len(&ib->ia_prefixmask.sin6_addr));
return NULL;
}
/* make ifaddr */
ia = (struct in6_ifaddr *)malloc(sizeof(*ia), M_IFADDR, M_DONTWAIT);
if (ia == NULL) {
printf("ENOBUFS in in6_ifadd %d\n", __LINE__);
return NULL;
}
bzero((caddr_t)ia, sizeof(*ia));
ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
ia->ia_ifp = ifp;
/* link to in6_ifaddr */
if ((oia = in6_ifaddr) != NULL) {
for( ; oia->ia_next; oia = oia->ia_next)
continue;
oia->ia_next = ia;
} else
in6_ifaddr = ia;
/* link to if_addrlist */
if (!TAILQ_EMPTY(&ifp->if_addrlist)) {
TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia,
ifa_list);
}
/* new address */
ia->ia_addr.sin6_len = sizeof(struct sockaddr_in6);
ia->ia_addr.sin6_family = AF_INET6;
/* prefix */
bcopy(in6, &ia->ia_addr.sin6_addr, sizeof(ia->ia_addr.sin6_addr));
ia->ia_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
ia->ia_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
ia->ia_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
ia->ia_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
/* interface ID */
ia->ia_addr.sin6_addr.s6_addr32[0]
|= (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
ia->ia_addr.sin6_addr.s6_addr32[1]
|= (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
ia->ia_addr.sin6_addr.s6_addr32[2]
|= (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
ia->ia_addr.sin6_addr.s6_addr32[3]
|= (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
/* new prefix */
ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
ia->ia_prefixmask.sin6_family = AF_INET6;
bcopy(&mask, &ia->ia_prefixmask.sin6_addr,
sizeof(ia->ia_prefixmask.sin6_addr));
/* same routine */
ia->ia_ifa.ifa_rtrequest =
(ifp->if_type == IFT_PPP) ? nd6_p2p_rtrequest : nd6_rtrequest;
ia->ia_ifa.ifa_flags |= RTF_CLONING;
ia->ia_ifa.ifa_metric = ifp->if_metric;
/* add interface route */
if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP|RTF_CLONING))) {
log(LOG_NOTICE, "in6_ifadd: failed to add an interface route "
"for %s/%d on %s, errno = %d\n",
ip6_sprintf(&ia->ia_addr.sin6_addr), prefixlen,
if_name(ifp), error);
} else
ia->ia_flags |= IFA_ROUTE;
*addr = ia->ia_addr.sin6_addr;
if (ifp->if_flags & IFF_MULTICAST) {
int error; /* not used */
struct in6_addr sol6;
/* join solicited node multicast address */
bzero(&sol6, sizeof(sol6));
sol6.s6_addr16[0] = htons(0xff02);
sol6.s6_addr16[1] = htons(ifp->if_index);
sol6.s6_addr32[1] = 0;
sol6.s6_addr32[2] = htonl(1);
sol6.s6_addr32[3] = ia->ia_addr.sin6_addr.s6_addr32[3];
sol6.s6_addr8[12] = 0xff;
(void)in6_addmulti(&sol6, ifp, &error);
}
ia->ia6_flags |= IN6_IFF_TENTATIVE;
/*
* To make the interface up. Only AF_INET6 in ia is used...
*/
s = splimp();
if (ifp->if_ioctl && (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia)) {
splx(s);
return NULL;
}
splx(s);
/* Perform DAD, if needed. */
nd6_dad_start((struct ifaddr *)ia, NULL);
return ia;
}
int
in6_ifdel(ifp, in6)
struct ifnet *ifp;
struct in6_addr *in6;
{
struct in6_ifaddr *ia = (struct in6_ifaddr *)NULL;
struct in6_ifaddr *oia = (struct in6_ifaddr *)NULL;
if (!ifp)
return -1;
ia = in6ifa_ifpwithaddr(ifp, in6);
if (!ia)
return -1;
if (ifp->if_flags & IFF_MULTICAST) {
/*
* delete solicited multicast addr for deleting host id
*/
struct in6_multi *in6m;
struct in6_addr llsol;
bzero(&llsol, sizeof(struct in6_addr));
llsol.s6_addr16[0] = htons(0xff02);
llsol.s6_addr16[1] = htons(ifp->if_index);
llsol.s6_addr32[1] = 0;
llsol.s6_addr32[2] = htonl(1);
llsol.s6_addr32[3] =
ia->ia_addr.sin6_addr.s6_addr32[3];
llsol.s6_addr8[12] = 0xff;
IN6_LOOKUP_MULTI(llsol, ifp, in6m);
if (in6m)
in6_delmulti(in6m);
}
if (ia->ia_flags & IFA_ROUTE) {
rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
ia->ia_flags &= ~IFA_ROUTE;
}
TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
/* lladdr is never deleted */
oia = ia;
if (oia == (ia = in6_ifaddr))
in6_ifaddr = ia->ia_next;
else {
while (ia->ia_next && (ia->ia_next != oia))
ia = ia->ia_next;
if (ia->ia_next)
ia->ia_next = oia->ia_next;
else
return -1;
}
IFAFREE((&oia->ia_ifa));
/* xxx
rtrequest(RTM_DELETE,
(struct sockaddr *)&ia->ia_addr,
(struct sockaddr *)0
(struct sockaddr *)&ia->ia_prefixmask,
RTF_UP|RTF_CLONING,
(struct rtentry **)0);
*/
return 0;
}
int
in6_init_prefix_ltimes(struct nd_prefix *ndpr)
{
/* check if preferred lifetime > valid lifetime */
if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
log(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;
}
/* ensure addr lifetime <= prefix lifetime */
if (new->ndpr_expire && lt6->ia6t_expire &&
new->ndpr_expire < lt6->ia6t_expire)
lt6->ia6t_expire = new->ndpr_expire;
if (new->ndpr_preferred && lt6->ia6t_preferred
&& new->ndpr_preferred < lt6->ia6t_preferred)
lt6->ia6t_preferred = new->ndpr_preferred;
}
/*
* 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);
rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
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);
/*
* 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
}
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