43bc7a9c62
were unused or already in if_var.h so add if_name() to if_var.h and remove net_osdep.h along with all references to it. Longer term we may want to kill off if_name() entierly since all modern BSDs have if_xname variables rendering it unnecessicary.
2108 lines
57 KiB
C
2108 lines
57 KiB
C
/* $FreeBSD$ */
|
|
/* $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>
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|
#include <sys/malloc.h>
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|
#include <sys/mbuf.h>
|
|
#include <sys/socket.h>
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|
#include <sys/sockio.h>
|
|
#include <sys/time.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/errno.h>
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|
#include <sys/syslog.h>
|
|
#include <sys/queue.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_types.h>
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|
#include <net/if_dl.h>
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|
#include <net/route.h>
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|
#include <net/radix.h>
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|
|
|
#include <netinet/in.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/in6_ifattach.h>
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|
#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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|
#include <netinet6/nd6.h>
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|
#include <netinet/icmp6.h>
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|
#include <netinet6/scope6_var.h>
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|
|
|
#define SDL(s) ((struct sockaddr_dl *)s)
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|
|
|
static int rtpref __P((struct nd_defrouter *));
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|
static struct nd_defrouter *defrtrlist_update __P((struct nd_defrouter *));
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static int prelist_update __P((struct nd_prefixctl *, struct nd_defrouter *,
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|
struct mbuf *, int));
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|
static struct in6_ifaddr *in6_ifadd __P((struct nd_prefixctl *, int));
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static struct nd_pfxrouter *pfxrtr_lookup __P((struct nd_prefix *,
|
|
struct nd_defrouter *));
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static void pfxrtr_add __P((struct nd_prefix *, struct nd_defrouter *));
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static void pfxrtr_del __P((struct nd_pfxrouter *));
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static struct nd_pfxrouter *find_pfxlist_reachable_router
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__P((struct nd_prefix *));
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static void defrouter_delreq __P((struct nd_defrouter *));
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static void nd6_rtmsg __P((int, struct rtentry *));
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|
|
|
static int in6_init_prefix_ltimes __P((struct nd_prefix *));
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static void in6_init_address_ltimes __P((struct nd_prefix *,
|
|
struct in6_addrlifetime *));
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|
|
|
static int rt6_deleteroute __P((struct radix_node *, void *));
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|
|
|
extern int nd6_recalc_reachtm_interval;
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|
|
|
static struct ifnet *nd6_defifp;
|
|
int nd6_defifindex;
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|
|
|
int ip6_use_tempaddr = 0;
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|
|
|
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;
|
|
|
|
/* 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 */
|
|
|
|
/*
|
|
* 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;
|
|
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)
|
|
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)));
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|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* Don't update the neighbor cache, if src = ::.
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|
* This indicates that the src has no IP address assigned yet.
|
|
*/
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
|
|
goto freeit;
|
|
|
|
#ifndef PULLDOWN_TEST
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|
IP6_EXTHDR_CHECK(m, off, icmp6len,);
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nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
|
|
#else
|
|
IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
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|
if (nd_rs == NULL) {
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|
icmp6stat.icp6s_tooshort++;
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|
return;
|
|
}
|
|
#endif
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|
|
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icmp6len -= sizeof(*nd_rs);
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|
nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
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|
if (nd6_options(&ndopts) < 0) {
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|
nd6log((LOG_INFO,
|
|
"nd6_rs_input: invalid ND option, ignored\n"));
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|
/* nd6_options have incremented stats */
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|
goto freeit;
|
|
}
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|
|
|
if (ndopts.nd_opts_src_lladdr) {
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lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
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lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
|
|
}
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|
|
|
if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
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|
nd6log((LOG_INFO,
|
|
"nd6_rs_input: lladdrlen mismatch for %s "
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|
"(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);
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|
|
|
freeit:
|
|
m_freem(m);
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|
return;
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|
|
|
bad:
|
|
icmp6stat.icp6s_badrs++;
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m_freem(m);
|
|
}
|
|
|
|
/*
|
|
* Receive Router Advertisement Message.
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|
*
|
|
* Based on RFC 2461
|
|
* TODO: on-link bit on prefix information
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|
* TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
|
|
*/
|
|
void
|
|
nd6_ra_input(m, off, icmp6len)
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|
struct mbuf *m;
|
|
int off, icmp6len;
|
|
{
|
|
struct ifnet *ifp = m->m_pkthdr.rcvif;
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|
struct nd_ifinfo *ndi = ND_IFINFO(ifp);
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struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
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struct nd_router_advert *nd_ra;
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|
struct in6_addr saddr6 = ip6->ip6_src;
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int mcast = 0;
|
|
union nd_opts ndopts;
|
|
struct nd_defrouter *dr;
|
|
|
|
/*
|
|
* We only accept RAs only when
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|
* the system-wide variable allows the acceptance, and
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|
* per-interface variable allows RAs on the receiving interface.
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|
*/
|
|
if (ip6_accept_rtadv == 0)
|
|
goto freeit;
|
|
if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
|
|
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;
|
|
|
|
/* remember if this is a multicasted advertisement */
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
|
|
mcast = 1;
|
|
|
|
bzero(&dr0, sizeof(dr0));
|
|
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) {
|
|
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_prefixctl 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;
|
|
}
|
|
|
|
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);
|
|
(void)prelist_update(&pr, dr, m, mcast);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* MTU
|
|
*/
|
|
if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
|
|
u_long mtu;
|
|
u_long maxmtu;
|
|
|
|
mtu = (u_long)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=%lu sent from %s, ignoring\n",
|
|
mtu, ip6_sprintf(&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, "nd6_ra_input: bogus mtu "
|
|
"mtu=%lu sent from %s; "
|
|
"exceeds maxmtu %lu, ignoring\n",
|
|
mtu, ip6_sprintf(&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,
|
|
"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);
|
|
if (rt->rt_ifp) {
|
|
info.rti_info[RTAX_IFP] =
|
|
TAILQ_FIRST(&rt->rt_ifp->if_addrlist)->ifa_addr;
|
|
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;
|
|
int error;
|
|
|
|
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 = gate.sin6_family = AF_INET6;
|
|
gate.sin6_addr = new->rtaddr;
|
|
|
|
s = splnet();
|
|
error = rtrequest(RTM_ADD, (struct sockaddr *)&def,
|
|
(struct sockaddr *)&gate, (struct sockaddr *)&mask,
|
|
RTF_GATEWAY, &newrt);
|
|
if (newrt) {
|
|
RT_LOCK(newrt);
|
|
nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
|
|
RT_REMREF(newrt);
|
|
RT_UNLOCK(newrt);
|
|
}
|
|
if (error == 0)
|
|
new->installed = 1;
|
|
splx(s);
|
|
return;
|
|
}
|
|
|
|
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 */
|
|
}
|
|
|
|
/*
|
|
* Remove the default route for a given router.
|
|
* This is just a subroutine function for defrouter_select(), and should
|
|
* not be called from anywhere else.
|
|
*/
|
|
static void
|
|
defrouter_delreq(dr)
|
|
struct nd_defrouter *dr;
|
|
{
|
|
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 = 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);
|
|
}
|
|
|
|
dr->installed = 0;
|
|
}
|
|
|
|
/*
|
|
* remove all default routes from default router list
|
|
*/
|
|
void
|
|
defrouter_reset()
|
|
{
|
|
struct nd_defrouter *dr;
|
|
|
|
for (dr = TAILQ_FIRST(&nd_defrouter); dr;
|
|
dr = TAILQ_NEXT(dr, dr_entry))
|
|
defrouter_delreq(dr);
|
|
|
|
/*
|
|
* XXX should we also nuke any default routers in the kernel, by
|
|
* going through them by rtalloc1()?
|
|
*/
|
|
}
|
|
|
|
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) /* XXX: better condition? */
|
|
rt6_flush(&dr->rtaddr, dr->ifp);
|
|
|
|
if (dr->installed) {
|
|
deldr = dr;
|
|
defrouter_delreq(dr);
|
|
}
|
|
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 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
|
|
defrouter_select()
|
|
{
|
|
int s = splnet();
|
|
struct nd_defrouter *dr, *selected_dr = NULL, *installed_dr = NULL;
|
|
struct rtentry *rt = NULL;
|
|
struct llinfo_nd6 *ln = NULL;
|
|
|
|
/*
|
|
* 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 || !ip6_accept_rtadv) {
|
|
nd6log((LOG_WARNING,
|
|
"defrouter_select: called unexpectedly (forwarding=%d, "
|
|
"accept_rtadv=%d)\n", ip6_forwarding, ip6_accept_rtadv));
|
|
splx(s);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Let's handle easy case (3) first:
|
|
* If default router list is empty, there's nothing to be done.
|
|
*/
|
|
if (!TAILQ_FIRST(&nd_defrouter)) {
|
|
splx(s);
|
|
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().
|
|
*/
|
|
for (dr = TAILQ_FIRST(&nd_defrouter); dr;
|
|
dr = TAILQ_NEXT(dr, dr_entry)) {
|
|
if (selected_dr == NULL &&
|
|
(rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
|
|
(ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
|
|
ND6_IS_LLINFO_PROBREACH(ln)) {
|
|
selected_dr = dr;
|
|
}
|
|
|
|
if (dr->installed && installed_dr == NULL)
|
|
installed_dr = dr;
|
|
else if (dr->installed && installed_dr) {
|
|
/* this should not happen. warn for diagnosis. */
|
|
log(LOG_ERR, "defrouter_select: more than one router"
|
|
" is installed\n");
|
|
}
|
|
}
|
|
/*
|
|
* 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 || !TAILQ_NEXT(installed_dr, dr_entry))
|
|
selected_dr = TAILQ_FIRST(&nd_defrouter);
|
|
else
|
|
selected_dr = TAILQ_NEXT(installed_dr, dr_entry);
|
|
} else if (installed_dr &&
|
|
(rt = nd6_lookup(&installed_dr->rtaddr, 0, installed_dr->ifp)) &&
|
|
(ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
|
|
ND6_IS_LLINFO_PROBREACH(ln) &&
|
|
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);
|
|
}
|
|
|
|
splx(s);
|
|
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(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 {
|
|
int oldpref = rtpref(dr);
|
|
|
|
/* override */
|
|
dr->flags = new->flags; /* xxx flag check */
|
|
dr->rtlifetime = new->rtlifetime;
|
|
dr->expire = new->expire;
|
|
|
|
/*
|
|
* If the preference does not change, there's no need
|
|
* to sort the entries.
|
|
*/
|
|
if (rtpref(new) == oldpref) {
|
|
splx(s);
|
|
return (dr);
|
|
}
|
|
|
|
/*
|
|
* preferred router may be changed, so relocate
|
|
* this router.
|
|
* XXX: calling TAILQ_REMOVE directly is a bad manner.
|
|
* However, since defrtrlist_del() has many side
|
|
* effects, we intentionally do so here.
|
|
* defrouter_select() below will handle routing
|
|
* changes later.
|
|
*/
|
|
TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
|
|
n = dr;
|
|
goto insert;
|
|
}
|
|
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:
|
|
/*
|
|
* 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 */
|
|
for (dr = TAILQ_FIRST(&nd_defrouter); dr;
|
|
dr = TAILQ_NEXT(dr, dr_entry)) {
|
|
if (rtpref(n) > rtpref(dr))
|
|
break;
|
|
}
|
|
if (dr)
|
|
TAILQ_INSERT_BEFORE(dr, n, dr_entry);
|
|
else
|
|
TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
|
|
|
|
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(key)
|
|
struct nd_prefixctl *key;
|
|
{
|
|
struct nd_prefix *search;
|
|
|
|
for (search = nd_prefix.lh_first; search; search = search->ndpr_next) {
|
|
if (key->ndpr_ifp == search->ndpr_ifp &&
|
|
key->ndpr_plen == search->ndpr_plen &&
|
|
in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
|
|
&search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return (search);
|
|
}
|
|
|
|
int
|
|
nd6_prelist_add(pr, dr, newp)
|
|
struct nd_prefixctl *pr;
|
|
struct nd_prefix **newp;
|
|
struct nd_defrouter *dr;
|
|
{
|
|
struct nd_prefix *new = NULL;
|
|
int error = 0;
|
|
int i, s;
|
|
|
|
new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
|
|
if (new == NULL)
|
|
return(ENOMEM);
|
|
bzero(new, sizeof(*new));
|
|
new->ndpr_ifp = pr->ndpr_ifp;
|
|
new->ndpr_prefix = pr->ndpr_prefix;
|
|
new->ndpr_plen = pr->ndpr_plen;
|
|
new->ndpr_vltime = pr->ndpr_vltime;
|
|
new->ndpr_pltime = pr->ndpr_pltime;
|
|
new->ndpr_flags = pr->ndpr_flags;
|
|
if ((error = in6_init_prefix_ltimes(new)) != 0) {
|
|
free(new, M_IP6NDP);
|
|
return(error);
|
|
}
|
|
new->ndpr_lastupdate = time_second;
|
|
if (newp != NULL)
|
|
*newp = new;
|
|
|
|
/* initialization */
|
|
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;
|
|
|
|
/*
|
|
* Though these flags are now meaningless, we'd rather keep the value
|
|
* of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
|
|
* when executing "ndp -p".
|
|
*/
|
|
|
|
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();
|
|
}
|
|
|
|
static int
|
|
prelist_update(new, dr, m, mcast)
|
|
struct nd_prefixctl *new;
|
|
struct nd_defrouter *dr; /* may be NULL */
|
|
struct mbuf *m;
|
|
int mcast;
|
|
{
|
|
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));
|
|
#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;
|
|
(void)in6_init_prefix_ltimes(pr); /* XXX error case? */
|
|
pr->ndpr_lastupdate = time_second;
|
|
}
|
|
|
|
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;
|
|
|
|
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 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 (!new->ndpr_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 (new->ndpr_pltime > new->ndpr_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".
|
|
*/
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
|
|
struct in6_ifaddr *ifa6;
|
|
u_int32_t remaininglifetime;
|
|
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
|
continue;
|
|
|
|
ifa6 = (struct in6_ifaddr *)ifa;
|
|
|
|
/*
|
|
* We only consider autoconfigured addresses as per rfc2462bis.
|
|
*/
|
|
if (!(ifa6->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 ((ifa6->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 (ifa6->ia6_ndpr != pr)
|
|
continue;
|
|
|
|
if (ia6_match == NULL) /* remember the first one */
|
|
ia6_match = ifa6;
|
|
|
|
/*
|
|
* 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 = ifa6->ia6_lifetime;
|
|
|
|
if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
|
|
remaininglifetime = ND6_INFINITE_LIFETIME;
|
|
else if (time_second - ifa6->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_second - ifa6->ia6_updatetime);
|
|
|
|
/* when not updating, keep the current stored lifetime. */
|
|
lt6_tmp.ia6t_vltime = remaininglifetime;
|
|
|
|
if (TWOHOUR < new->ndpr_vltime ||
|
|
remaininglifetime < new->ndpr_vltime) {
|
|
lt6_tmp.ia6t_vltime = new->ndpr_vltime;
|
|
} else if (remaininglifetime <= TWOHOUR) {
|
|
if (auth) {
|
|
lt6_tmp.ia6t_vltime = new->ndpr_vltime;
|
|
}
|
|
} else {
|
|
/*
|
|
* new->ndpr_vltime <= TWOHOUR &&
|
|
* TWOHOUR < remaininglifetime
|
|
*/
|
|
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, <6_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 ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
|
|
u_int32_t maxvltime, maxpltime;
|
|
|
|
if (ip6_temp_valid_lifetime >
|
|
(u_int32_t)((time_second - ifa6->ia6_createtime) +
|
|
ip6_desync_factor)) {
|
|
maxvltime = ip6_temp_valid_lifetime -
|
|
(time_second - ifa6->ia6_createtime) -
|
|
ip6_desync_factor;
|
|
} else
|
|
maxvltime = 0;
|
|
if (ip6_temp_preferred_lifetime >
|
|
(u_int32_t)((time_second - ifa6->ia6_createtime) +
|
|
ip6_desync_factor)) {
|
|
maxpltime = ip6_temp_preferred_lifetime -
|
|
(time_second - ifa6->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;
|
|
}
|
|
}
|
|
ifa6->ia6_lifetime = lt6_tmp;
|
|
ifa6->ia6_updatetime = time_second;
|
|
}
|
|
if (ia6_match == NULL && new->ndpr_vltime) {
|
|
int ifidlen;
|
|
|
|
/*
|
|
* 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, "prelist_update: IFID undefined (%s)\n",
|
|
if_name(ifp));
|
|
goto end;
|
|
}
|
|
if (ifidlen + pr->ndpr_plen != 128) {
|
|
nd6log((LOG_INFO,
|
|
"prelist_update: invalid prefixlen "
|
|
"%d for %s, ignored\n",
|
|
pr->ndpr_plen, if_name(ifp)));
|
|
goto end;
|
|
}
|
|
|
|
if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
|
|
/*
|
|
* note that we should use pr (not new) for reference.
|
|
*/
|
|
pr->ndpr_refcnt++;
|
|
ia6->ia6_ndpr = pr;
|
|
|
|
/*
|
|
* 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, 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. */
|
|
}
|
|
}
|
|
|
|
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;
|
|
struct nd_defrouter *dr;
|
|
struct nd_pfxrouter *pfxrtr = NULL;
|
|
|
|
/*
|
|
* 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 we have no such prefix, check whether we still have a router
|
|
* that does not advertise any prefixes.
|
|
*/
|
|
if (pr == NULL) {
|
|
for (dr = TAILQ_FIRST(&nd_defrouter); dr;
|
|
dr = TAILQ_NEXT(dr, dr_entry)) {
|
|
struct nd_prefix *pr0;
|
|
|
|
for (pr0 = nd_prefix.lh_first; pr0;
|
|
pr0 = pr0->ndpr_next) {
|
|
if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
|
|
break;
|
|
}
|
|
if (pfxrtr != NULL)
|
|
break;
|
|
}
|
|
}
|
|
if (pr != NULL || (TAILQ_FIRST(&nd_defrouter) && pfxrtr == NULL)) {
|
|
/*
|
|
* 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.
|
|
*/
|
|
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 onlink, 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))
|
|
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)) {
|
|
if (ifa->ia6_flags & IN6_IFF_DETACHED) {
|
|
ifa->ia6_flags &= ~IN6_IFF_DETACHED;
|
|
ifa->ia6_flags |= IN6_IFF_TENTATIVE;
|
|
nd6_dad_start((struct ifaddr *)ifa, 0);
|
|
}
|
|
} 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;
|
|
|
|
if (ifa->ia6_flags & IN6_IFF_DETACHED) {
|
|
ifa->ia6_flags &= ~IN6_IFF_DETACHED;
|
|
ifa->ia6_flags |= IN6_IFF_TENTATIVE;
|
|
/* Do we need a delay in this case? */
|
|
nd6_dad_start((struct ifaddr *)ifa, 0);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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_LOCK(rt);
|
|
RT_REMREF(rt);
|
|
RT_UNLOCK(rt);
|
|
}
|
|
|
|
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, mcast)
|
|
struct nd_prefixctl *pr;
|
|
int mcast;
|
|
{
|
|
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;
|
|
int updateflags;
|
|
|
|
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.
|
|
*/
|
|
ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
|
|
if (ifa)
|
|
ib = (struct in6_ifaddr *)ifa;
|
|
else
|
|
return NULL;
|
|
|
|
/* 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 */
|
|
ifra.ifra_addr.sin6_addr = pr->ndpr_prefix.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 */
|
|
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]);
|
|
|
|
/* 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));
|
|
|
|
/* lifetimes. */
|
|
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 */
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
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",
|
|
ip6_sprintf(&ifra.ifra_addr.sin6_addr));
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* 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, NULL, updateflags)) != 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 is always non-NULL */
|
|
}
|
|
|
|
int
|
|
in6_tmpifadd(ia0, forcegen, delay)
|
|
const struct in6_ifaddr *ia0; /* corresponding public address */
|
|
int forcegen, 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];
|
|
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:
|
|
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, "in6_tmpifadd: 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.
|
|
*/
|
|
for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
|
|
if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
|
|
&ifra.ifra_addr.sin6_addr)) {
|
|
if (trylimit-- == 0) {
|
|
/*
|
|
* Give up. Something strange should have
|
|
* happened.
|
|
*/
|
|
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_vltime != ND6_INFINITE_LIFETIME) {
|
|
vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
|
|
(ia0->ia6_lifetime.ia6t_vltime -
|
|
(time_second - 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_second - 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 (delay)
|
|
updateflags |= IN6_IFAUPDATE_DADDELAY;
|
|
if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 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);
|
|
}
|
|
|
|
static int
|
|
in6_init_prefix_ltimes(struct nd_prefix *ndpr)
|
|
{
|
|
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;
|
|
}
|
|
|
|
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 (ifindex != 0 && !ifnet_byindex(ifindex))
|
|
return (EINVAL);
|
|
|
|
if (nd6_defifindex != ifindex) {
|
|
nd6_defifindex = ifindex;
|
|
if (nd6_defifindex > 0)
|
|
nd6_defifp = ifnet_byindex(nd6_defifindex);
|
|
else
|
|
nd6_defifp = NULL;
|
|
|
|
/*
|
|
* 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);
|
|
}
|