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freebsd-nq/sys/netinet6/nd6_rtr.c
Alexander V. Chernikov 81728a538d Split rtinit() into multiple functions. 
rtinit[1]() is a function used to add or remove interface address prefix routes,
  similar to ifa_maintain_loopback_route().
It was intended to be family-agnostic. There is a problem with this approach
 in reality.

1) IPv6 code does not use it for the ifa routes. There is a separate layer,
  nd6_prelist_(), providing interface for maintaining interface routes. Its part,
  responsible for the actual route table interaction, mimics rtenty() code.

2) rtinit tries to combine multiple actions in the same function: constructing
  proper route attributes and handling iterations over multiple fibs, for the
  non-zero net.add_addr_allfibs use case. It notably increases the code complexity.

3) dstaddr handling. flags parameter re-uses RTF_ flags. As there is no special flag
 for p2p connections, host routes and p2p routes are handled in the same way.
 Additionally, mapping IFA flags to RTF flags makes the interface pretty messy.
 It make rtinit() to clash with ifa_mainain_loopback_route() for IPV4 interface
 aliases.

4) rtinit() is the last customer passing non-masked prefixes to rib_action(),
 complicating rib_action() implementation.

5) rtinit() coupled ifa announce/withdrawal notifications, producing "false positive"
 ifa messages in certain corner cases.

To address all these points, the following has been done:

* rtinit() has been split into multiple functions:
- Route attribute construction were moved to the per-address-family functions,
 dealing with (2), (3) and (4).
- funnction providing net.add_addr_allfibs handling and route rtsock notificaions
 is the new routing table inteface.
- rtsock ifa notificaion has been moved out as well. resulting set of funcion are only
 responsible for the actual route notifications.

Side effects:
* /32 alias does not result in interface routes (/32 route and "host" route)
* RTF_PINNED is now set for IPv6 prefixes corresponding to the interface addresses

Differential revision:	https://reviews.freebsd.org/D28186
2021-01-16 22:42:41 +00:00

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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.
*
* $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/refcount.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/errno.h>
#include <sys/rmlock.h>
#include <sys/rwlock.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/queue.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_types.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/route/nhop.h>
#include <net/route/route_ctl.h>
#include <net/route/route_var.h>
#include <net/radix.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <net/if_llatbl.h>
#include <netinet6/in6_var.h>
#include <netinet6/in6_ifattach.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <netinet/icmp6.h>
#include <netinet6/scope6_var.h>
static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *);
static int prelist_update(struct nd_prefixctl *, struct nd_defrouter *,
struct mbuf *, int);
static int nd6_prefix_onlink(struct nd_prefix *);
TAILQ_HEAD(nd6_drhead, nd_defrouter);
VNET_DEFINE_STATIC(struct nd6_drhead, nd6_defrouter);
#define V_nd6_defrouter VNET(nd6_defrouter)
VNET_DECLARE(int, nd6_recalc_reachtm_interval);
#define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval)
VNET_DEFINE_STATIC(struct ifnet *, nd6_defifp);
VNET_DEFINE(int, nd6_defifindex);
#define V_nd6_defifp VNET(nd6_defifp)
VNET_DEFINE(int, ip6_use_tempaddr) = 0;
VNET_DEFINE(int, ip6_desync_factor);
VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME;
VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME;
VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE;
#ifdef EXPERIMENTAL
VNET_DEFINE(int, nd6_ignore_ipv6_only_ra) = 1;
#endif
SYSCTL_DECL(_net_inet6_icmp6);
/* RTPREF_MEDIUM has to be 0! */
#define RTPREF_HIGH 1
#define RTPREF_MEDIUM 0
#define RTPREF_LOW (-1)
#define RTPREF_RESERVED (-2)
#define RTPREF_INVALID (-3) /* internal */
static void
defrouter_ref(struct nd_defrouter *dr)
{
refcount_acquire(&dr->refcnt);
}
void
defrouter_rele(struct nd_defrouter *dr)
{
if (refcount_release(&dr->refcnt))
free(dr, M_IP6NDP);
}
/*
* Remove a router from the global list and optionally stash it in a
* caller-supplied queue.
*/
static void
defrouter_unlink(struct nd_defrouter *dr, struct nd6_drhead *drq)
{
ND6_WLOCK_ASSERT();
TAILQ_REMOVE(&V_nd6_defrouter, dr, dr_entry);
V_nd6_list_genid++;
if (drq != NULL)
TAILQ_INSERT_TAIL(drq, dr, dr_entry);
}
/*
* 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(struct mbuf *m, int off, int icmp6len)
{
struct ifnet *ifp;
struct ip6_hdr *ip6;
struct nd_router_solicit *nd_rs;
struct in6_addr saddr6;
union nd_opts ndopts;
char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
char *lladdr;
int lladdrlen;
ifp = m->m_pkthdr.rcvif;
/*
* Accept RS only when V_ip6_forwarding=1 and the interface has
* no ND6_IFF_ACCEPT_RTADV.
*/
if (!V_ip6_forwarding || ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV)
goto freeit;
/* RFC 6980: Nodes MUST silently ignore fragments */
if(m->m_flags & M_FRAGMENTED)
goto freeit;
/* Sanity checks */
ip6 = mtod(m, struct ip6_hdr *);
if (__predict_false(ip6->ip6_hlim != 255)) {
ICMP6STAT_INC(icp6s_invlhlim);
nd6log((LOG_ERR,
"%s: invalid hlim (%d) from %s to %s on %s\n", __func__,
ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
goto bad;
}
/*
* Don't update the neighbor cache, if src = ::.
* This indicates that the src has no IP address assigned yet.
*/
saddr6 = ip6->ip6_src;
if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
goto freeit;
if (m->m_len < off + icmp6len) {
m = m_pullup(m, off + icmp6len);
if (m == NULL) {
IP6STAT_INC(ip6s_exthdrtoolong);
return;
}
}
ip6 = mtod(m, struct ip6_hdr *);
nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
icmp6len -= sizeof(*nd_rs);
nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
if (nd6_options(&ndopts) < 0) {
nd6log((LOG_INFO,
"%s: invalid ND option, ignored\n", __func__));
/* nd6_options have incremented stats */
goto freeit;
}
lladdr = NULL;
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,
"%s: lladdrlen mismatch for %s (if %d, RS packet %d)\n",
__func__, ip6_sprintf(ip6bufs, &saddr6),
ifp->if_addrlen, lladdrlen - 2));
goto bad;
}
nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
freeit:
m_freem(m);
return;
bad:
ICMP6STAT_INC(icp6s_badrs);
m_freem(m);
}
#ifdef EXPERIMENTAL
/*
* An initial update routine for draft-ietf-6man-ipv6only-flag.
* We need to iterate over all default routers for the given
* interface to see whether they are all advertising the "S"
* (IPv6-Only) flag. If they do set, otherwise unset, the
* interface flag we later use to filter on.
*/
static void
defrtr_ipv6_only_ifp(struct ifnet *ifp)
{
struct nd_defrouter *dr;
bool ipv6_only, ipv6_only_old;
#ifdef INET
struct epoch_tracker et;
struct ifaddr *ifa;
bool has_ipv4_addr;
#endif
if (V_nd6_ignore_ipv6_only_ra != 0)
return;
ipv6_only = true;
ND6_RLOCK();
TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry)
if (dr->ifp == ifp &&
(dr->raflags & ND_RA_FLAG_IPV6_ONLY) == 0)
ipv6_only = false;
ND6_RUNLOCK();
IF_AFDATA_WLOCK(ifp);
ipv6_only_old = ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY;
IF_AFDATA_WUNLOCK(ifp);
/* If nothing changed, we have an early exit. */
if (ipv6_only == ipv6_only_old)
return;
#ifdef INET
/*
* Should we want to set the IPV6-ONLY flag, check if the
* interface has a non-0/0 and non-link-local IPv4 address
* configured on it. If it has we will assume working
* IPv4 operations and will clear the interface flag.
*/
has_ipv4_addr = false;
if (ipv6_only) {
NET_EPOCH_ENTER(et);
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
if (in_canforward(
satosin(ifa->ifa_addr)->sin_addr)) {
has_ipv4_addr = true;
break;
}
}
NET_EPOCH_EXIT(et);
}
if (ipv6_only && has_ipv4_addr) {
log(LOG_NOTICE, "%s rcvd RA w/ IPv6-Only flag set but has IPv4 "
"configured, ignoring IPv6-Only flag.\n", ifp->if_xname);
ipv6_only = false;
}
#endif
IF_AFDATA_WLOCK(ifp);
if (ipv6_only)
ND_IFINFO(ifp)->flags |= ND6_IFF_IPV6_ONLY;
else
ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY;
IF_AFDATA_WUNLOCK(ifp);
#ifdef notyet
/* Send notification of flag change. */
#endif
}
static void
defrtr_ipv6_only_ipf_down(struct ifnet *ifp)
{
IF_AFDATA_WLOCK(ifp);
ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY;
IF_AFDATA_WUNLOCK(ifp);
}
#endif /* EXPERIMENTAL */
void
nd6_ifnet_link_event(void *arg __unused, struct ifnet *ifp, int linkstate)
{
/*
* XXX-BZ we might want to trigger re-evaluation of our default router
* availability. E.g., on link down the default router might be
* unreachable but a different interface might still have connectivity.
*/
#ifdef EXPERIMENTAL
if (linkstate == LINK_STATE_DOWN)
defrtr_ipv6_only_ipf_down(ifp);
#endif
}
/*
* Receive Router Advertisement Message.
*
* Based on RFC 2461
* TODO: on-link bit on prefix information
* TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
*/
void
nd6_ra_input(struct mbuf *m, int off, int icmp6len)
{
struct ifnet *ifp;
struct nd_ifinfo *ndi;
struct ip6_hdr *ip6;
struct nd_router_advert *nd_ra;
struct in6_addr saddr6;
struct nd_defrouter *dr;
union nd_opts ndopts;
char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
int mcast;
/*
* We only accept RAs only when the per-interface flag
* ND6_IFF_ACCEPT_RTADV is on the receiving interface.
*/
ifp = m->m_pkthdr.rcvif;
ndi = ND_IFINFO(ifp);
if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
goto freeit;
/* RFC 6980: Nodes MUST silently ignore fragments */
if(m->m_flags & M_FRAGMENTED)
goto freeit;
ip6 = mtod(m, struct ip6_hdr *);
if (__predict_false(ip6->ip6_hlim != 255)) {
ICMP6STAT_INC(icp6s_invlhlim);
nd6log((LOG_ERR,
"%s: invalid hlim (%d) from %s to %s on %s\n", __func__,
ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
goto bad;
}
saddr6 = ip6->ip6_src;
if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
nd6log((LOG_ERR,
"%s: src %s is not link-local\n", __func__,
ip6_sprintf(ip6bufs, &saddr6)));
goto bad;
}
if (m->m_len < off + icmp6len) {
m = m_pullup(m, off + icmp6len);
if (m == NULL) {
IP6STAT_INC(ip6s_exthdrtoolong);
return;
}
}
ip6 = mtod(m, struct ip6_hdr *);
nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
icmp6len -= sizeof(*nd_ra);
nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
if (nd6_options(&ndopts) < 0) {
nd6log((LOG_INFO,
"%s: invalid ND option, ignored\n", __func__));
/* nd6_options have incremented stats */
goto freeit;
}
mcast = 0;
dr = NULL;
{
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.raflags = nd_ra->nd_ra_flags_reserved;
/*
* Effectively-disable routes from RA messages when
* ND6_IFF_NO_RADR enabled on the receiving interface or
* (ip6.forwarding == 1 && ip6.rfc6204w3 != 1).
*/
if (ndi->flags & ND6_IFF_NO_RADR)
dr0.rtlifetime = 0;
else if (V_ip6_forwarding && !V_ip6_rfc6204w3)
dr0.rtlifetime = 0;
else
dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
dr0.expire = time_uptime + 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 = V_nd6_recalc_reachtm_interval; /* reset */
}
}
if (nd_ra->nd_ra_retransmit)
ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
if (nd_ra->nd_ra_curhoplimit) {
if (ndi->chlim < nd_ra->nd_ra_curhoplimit)
ndi->chlim = nd_ra->nd_ra_curhoplimit;
else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) {
log(LOG_ERR, "RA with a lower CurHopLimit sent from "
"%s on %s (current = %d, received = %d). "
"Ignored.\n", ip6_sprintf(ip6bufs, &ip6->ip6_src),
if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit);
}
}
dr = defrtrlist_update(&dr0);
#ifdef EXPERIMENTAL
defrtr_ipv6_only_ifp(ifp);
#endif
}
/*
* 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,
"%s: invalid option len %d for prefix "
"information option, ignored\n", __func__,
pi->nd_opt_pi_len));
continue;
}
if (128 < pi->nd_opt_pi_prefix_len) {
nd6log((LOG_INFO,
"%s: invalid prefix len %d for prefix "
"information option, ignored\n", __func__,
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,
"%s: invalid prefix %s, ignored\n",
__func__, ip6_sprintf(ip6bufs,
&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);
}
}
if (dr != NULL) {
defrouter_rele(dr);
dr = NULL;
}
/*
* 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, "%s: bogus mtu option mtu=%lu sent "
"from %s, ignoring\n", __func__,
mtu, ip6_sprintf(ip6bufs, &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();
rt_updatemtu(ifp);
}
} else {
nd6log((LOG_INFO, "%s: bogus mtu=%lu sent from %s; "
"exceeds maxmtu %lu, ignoring\n", __func__,
mtu, ip6_sprintf(ip6bufs, &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,
"%s: lladdrlen mismatch for %s (if %d, RA packet %d)\n",
__func__, ip6_sprintf(ip6bufs, &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_INC(icp6s_badra);
m_freem(m);
}
/* PFXRTR */
static struct nd_pfxrouter *
pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
{
struct nd_pfxrouter *search;
ND6_LOCK_ASSERT();
LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) {
if (search->router == dr)
break;
}
return (search);
}
static void
pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
{
struct nd_pfxrouter *new;
bool update;
ND6_UNLOCK_ASSERT();
ND6_RLOCK();
if (pfxrtr_lookup(pr, dr) != NULL) {
ND6_RUNLOCK();
return;
}
ND6_RUNLOCK();
new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
if (new == NULL)
return;
defrouter_ref(dr);
new->router = dr;
ND6_WLOCK();
if (pfxrtr_lookup(pr, dr) == NULL) {
LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
update = true;
} else {
/* We lost a race to add the reference. */
defrouter_rele(dr);
free(new, M_IP6NDP);
update = false;
}
ND6_WUNLOCK();
if (update)
pfxlist_onlink_check();
}
static void
pfxrtr_del(struct nd_pfxrouter *pfr)
{
ND6_WLOCK_ASSERT();
LIST_REMOVE(pfr, pfr_entry);
defrouter_rele(pfr->router);
free(pfr, M_IP6NDP);
}
/* Default router list processing sub routines. */
static void
defrouter_addreq(struct nd_defrouter *new)
{
struct sockaddr_in6 def, mask, gate;
struct rt_addrinfo info;
struct rib_cmd_info rc;
unsigned int fibnum;
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;
fibnum = new->ifp->if_fib;
bzero((caddr_t)&info, sizeof(info));
info.rti_flags = RTF_GATEWAY;
info.rti_info[RTAX_DST] = (struct sockaddr *)&def;
info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&gate;
info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&mask;
NET_EPOCH_ASSERT();
error = rib_action(fibnum, RTM_ADD, &info, &rc);
if (rc.rc_rt != NULL) {
struct nhop_object *nh = nhop_select(rc.rc_nh_new, 0);
rt_routemsg(RTM_ADD, rc.rc_rt, nh, fibnum);
}
if (error == 0)
new->installed = 1;
}
/*
* Remove the default route for a given router.
* This is just a subroutine function for defrouter_select_fib(), and
* should not be called from anywhere else.
*/
static void
defrouter_delreq(struct nd_defrouter *dr)
{
struct sockaddr_in6 def, mask, gate;
struct rt_addrinfo info;
struct rib_cmd_info rc;
struct epoch_tracker et;
unsigned int fibnum;
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;
fibnum = dr->ifp->if_fib;
bzero((caddr_t)&info, sizeof(info));
info.rti_flags = RTF_GATEWAY;
info.rti_info[RTAX_DST] = (struct sockaddr *)&def;
info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&gate;
info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&mask;
NET_EPOCH_ENTER(et);
rib_action(fibnum, RTM_DELETE, &info, &rc);
if (rc.rc_rt != NULL) {
struct nhop_object *nh = nhop_select(rc.rc_nh_old, 0);
rt_routemsg(RTM_DELETE, rc.rc_rt, nh, fibnum);
}
NET_EPOCH_EXIT(et);
dr->installed = 0;
}
static void
defrouter_del(struct nd_defrouter *dr)
{
struct nd_defrouter *deldr = NULL;
struct nd_prefix *pr;
struct nd_pfxrouter *pfxrtr;
ND6_UNLOCK_ASSERT();
/*
* Flush all the routing table entries that use the router
* as a next hop.
*/
if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV)
rt6_flush(&dr->rtaddr, dr->ifp);
#ifdef EXPERIMENTAL
defrtr_ipv6_only_ifp(dr->ifp);
#endif
if (dr->installed) {
deldr = dr;
defrouter_delreq(dr);
}
/*
* Also delete all the pointers to the router in each prefix lists.
*/
ND6_WLOCK();
LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
pfxrtr_del(pfxrtr);
}
ND6_WUNLOCK();
pfxlist_onlink_check();
/*
* If the router is the primary one, choose a new one.
* Note that defrouter_select_fib() will remove the current
* gateway from the routing table.
*/
if (deldr)
defrouter_select_fib(deldr->ifp->if_fib);
/*
* Release the list reference.
*/
defrouter_rele(dr);
}
struct nd_defrouter *
defrouter_lookup_locked(const struct in6_addr *addr, struct ifnet *ifp)
{
struct nd_defrouter *dr;
ND6_LOCK_ASSERT();
TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry)
if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) {
defrouter_ref(dr);
return (dr);
}
return (NULL);
}
struct nd_defrouter *
defrouter_lookup(const struct in6_addr *addr, struct ifnet *ifp)
{
struct nd_defrouter *dr;
ND6_RLOCK();
dr = defrouter_lookup_locked(addr, ifp);
ND6_RUNLOCK();
return (dr);
}
/*
* Remove all default routes from default router list.
*/
void
defrouter_reset(void)
{
struct nd_defrouter *dr, **dra;
int count, i;
count = i = 0;
/*
* We can't delete routes with the ND lock held, so make a copy of the
* current default router list and use that when deleting routes.
*/
ND6_RLOCK();
TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry)
count++;
ND6_RUNLOCK();
dra = malloc(count * sizeof(*dra), M_TEMP, M_WAITOK | M_ZERO);
ND6_RLOCK();
TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
if (i == count)
break;
defrouter_ref(dr);
dra[i++] = dr;
}
ND6_RUNLOCK();
for (i = 0; i < count && dra[i] != NULL; i++) {
defrouter_delreq(dra[i]);
defrouter_rele(dra[i]);
}
free(dra, M_TEMP);
/*
* XXX should we also nuke any default routers in the kernel, by
* going through them by rtalloc1()?
*/
}
/*
* Look up a matching default router list entry and remove it. Returns true if a
* matching entry was found, false otherwise.
*/
bool
defrouter_remove(struct in6_addr *addr, struct ifnet *ifp)
{
struct nd_defrouter *dr;
ND6_WLOCK();
dr = defrouter_lookup_locked(addr, ifp);
if (dr == NULL) {
ND6_WUNLOCK();
return (false);
}
defrouter_unlink(dr, NULL);
ND6_WUNLOCK();
defrouter_del(dr);
defrouter_rele(dr);
return (true);
}
/*
* for default router selection
* regards router-preference field as a 2-bit signed integer
*/
static int
rtpref(struct nd_defrouter *dr)
{
switch (dr->raflags & 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->raflags);
return (RTPREF_INVALID);
}
/* NOTREACHED */
}
/*
* 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.
*
* We maintain a single list of routers for multiple FIBs, only considering one
* at a time based on the receiving interface's FIB. If @fibnum is RT_ALL_FIBS,
* we do the whole thing multiple times.
*/
void
defrouter_select_fib(int fibnum)
{
struct epoch_tracker et;
struct nd_defrouter *dr, *selected_dr, *installed_dr;
struct llentry *ln = NULL;
if (fibnum == RT_ALL_FIBS) {
for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
defrouter_select_fib(fibnum);
}
}
ND6_RLOCK();
/*
* Let's handle easy case (3) first:
* If default router list is empty, there's nothing to be done.
*/
if (TAILQ_EMPTY(&V_nd6_defrouter)) {
ND6_RUNLOCK();
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().
*/
selected_dr = installed_dr = NULL;
TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
NET_EPOCH_ENTER(et);
if (selected_dr == NULL && dr->ifp->if_fib == fibnum &&
(ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
ND6_IS_LLINFO_PROBREACH(ln)) {
selected_dr = dr;
defrouter_ref(selected_dr);
}
NET_EPOCH_EXIT(et);
if (ln != NULL) {
LLE_RUNLOCK(ln);
ln = NULL;
}
if (dr->installed && dr->ifp->if_fib == fibnum) {
if (installed_dr == NULL) {
installed_dr = dr;
defrouter_ref(installed_dr);
} else {
/*
* this should not happen.
* warn for diagnosis.
*/
log(LOG_ERR, "defrouter_select_fib: 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) == NULL)
dr = TAILQ_FIRST(&V_nd6_defrouter);
else
dr = TAILQ_NEXT(installed_dr, dr_entry);
/* Ensure we select a router for this FIB. */
TAILQ_FOREACH_FROM(dr, &V_nd6_defrouter, dr_entry) {
if (dr->ifp->if_fib == fibnum) {
selected_dr = dr;
defrouter_ref(selected_dr);
break;
}
}
} else if (installed_dr != NULL) {
NET_EPOCH_ENTER(et);
if ((ln = nd6_lookup(&installed_dr->rtaddr, 0,
installed_dr->ifp)) &&
ND6_IS_LLINFO_PROBREACH(ln) &&
installed_dr->ifp->if_fib == fibnum &&
rtpref(selected_dr) <= rtpref(installed_dr)) {
defrouter_rele(selected_dr);
selected_dr = installed_dr;
}
NET_EPOCH_EXIT(et);
if (ln != NULL)
LLE_RUNLOCK(ln);
}
ND6_RUNLOCK();
NET_EPOCH_ENTER(et);
/*
* If we selected a router for this FIB and it's different
* than the installed one, remove the installed router and
* install the selected one in its place.
*/
if (installed_dr != selected_dr) {
if (installed_dr != NULL) {
defrouter_delreq(installed_dr);
defrouter_rele(installed_dr);
}
if (selected_dr != NULL)
defrouter_addreq(selected_dr);
}
if (selected_dr != NULL)
defrouter_rele(selected_dr);
NET_EPOCH_EXIT(et);
}
static struct nd_defrouter *
defrtrlist_update(struct nd_defrouter *new)
{
struct nd_defrouter *dr, *n;
uint64_t genid;
int oldpref;
bool writelocked;
if (new->rtlifetime == 0) {
defrouter_remove(&new->rtaddr, new->ifp);
return (NULL);
}
ND6_RLOCK();
writelocked = false;
restart:
dr = defrouter_lookup_locked(&new->rtaddr, new->ifp);
if (dr != NULL) {
oldpref = rtpref(dr);
/* override */
dr->raflags = new->raflags; /* 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. Also make sure the selected
* router is still installed in the kernel.
*/
if (dr->installed && rtpref(new) == oldpref) {
if (writelocked)
ND6_WUNLOCK();
else
ND6_RUNLOCK();
return (dr);
}
}
/*
* The router needs to be reinserted into the default router
* list, so upgrade to a write lock. If that fails and the list
* has potentially changed while the lock was dropped, we'll
* redo the lookup with the write lock held.
*/
if (!writelocked) {
writelocked = true;
if (!ND6_TRY_UPGRADE()) {
genid = V_nd6_list_genid;
ND6_RUNLOCK();
ND6_WLOCK();
if (genid != V_nd6_list_genid)
goto restart;
}
}
if (dr != NULL) {
/*
* The preferred router may have changed, so relocate this
* router.
*/
TAILQ_REMOVE(&V_nd6_defrouter, dr, dr_entry);
n = dr;
} else {
n = malloc(sizeof(*n), M_IP6NDP, M_NOWAIT | M_ZERO);
if (n == NULL) {
ND6_WUNLOCK();
return (NULL);
}
memcpy(n, new, sizeof(*n));
/* Initialize with an extra reference for the caller. */
refcount_init(&n->refcnt, 2);
}
/*
* 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 */
TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
if (rtpref(n) > rtpref(dr))
break;
}
if (dr != NULL)
TAILQ_INSERT_BEFORE(dr, n, dr_entry);
else
TAILQ_INSERT_TAIL(&V_nd6_defrouter, n, dr_entry);
V_nd6_list_genid++;
ND6_WUNLOCK();
defrouter_select_fib(new->ifp->if_fib);
return (n);
}
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_uptime + ndpr->ndpr_pltime;
if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
ndpr->ndpr_expire = 0;
else
ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
return 0;
}
static void
in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
{
/* init ia6t_expire */
if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
lt6->ia6t_expire = 0;
else {
lt6->ia6t_expire = time_uptime;
lt6->ia6t_expire += lt6->ia6t_vltime;
}
/* init ia6t_preferred */
if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
lt6->ia6t_preferred = 0;
else {
lt6->ia6t_preferred = time_uptime;
lt6->ia6t_preferred += lt6->ia6t_pltime;
}
}
static struct in6_ifaddr *
in6_ifadd(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;
char ip6buf[INET6_ADDRSTRLEN];
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) {
ifa_free(ifa);
nd6log((LOG_INFO,
"%s: wrong prefixlen for %s (prefix=%d ifid=%d)\n",
__func__, if_name(ifp), prefixlen, 128 - plen0));
return NULL;
}
/* make ifaddr */
in6_prepare_ifra(&ifra, &pr->ndpr_prefix.sin6_addr, &mask);
IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, &mask);
/* 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]);
ifa_free(ifa);
/* 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.
*/
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
&ifra.ifra_addr.sin6_addr);
if (ifa != NULL) {
ifa_free(ifa);
/* this should be rare enough to make an explicit log */
log(LOG_INFO, "in6_ifadd: %s is already configured\n",
ip6_sprintf(ip6buf, &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,
"%s: failed to make ifaddr %s on %s (errno=%d)\n", __func__,
ip6_sprintf(ip6buf, &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);
/*
* XXXRW: Assumption of non-NULLness here might not be true with
* fine-grained locking -- should we validate it? Or just return
* earlier ifa rather than looking it up again?
*/
return (ia); /* this is always non-NULL and referenced. */
}
static struct nd_prefix *
nd6_prefix_lookup_locked(struct nd_prefixctl *key)
{
struct nd_prefix *search;
ND6_LOCK_ASSERT();
LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) {
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)) {
nd6_prefix_ref(search);
break;
}
}
return (search);
}
struct nd_prefix *
nd6_prefix_lookup(struct nd_prefixctl *key)
{
struct nd_prefix *search;
ND6_RLOCK();
search = nd6_prefix_lookup_locked(key);
ND6_RUNLOCK();
return (search);
}
void
nd6_prefix_ref(struct nd_prefix *pr)
{
refcount_acquire(&pr->ndpr_refcnt);
}
void
nd6_prefix_rele(struct nd_prefix *pr)
{
if (refcount_release(&pr->ndpr_refcnt)) {
KASSERT(LIST_EMPTY(&pr->ndpr_advrtrs),
("prefix %p has advertising routers", pr));
free(pr, M_IP6NDP);
}
}
int
nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
struct nd_prefix **newp)
{
struct nd_prefix *new;
char ip6buf[INET6_ADDRSTRLEN];
int error;
new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO);
if (new == NULL)
return (ENOMEM);
refcount_init(&new->ndpr_refcnt, newp != NULL ? 2 : 1);
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_uptime;
/* initialization */
LIST_INIT(&new->ndpr_advrtrs);
in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
/* make prefix in the canonical form */
IN6_MASK_ADDR(&new->ndpr_prefix.sin6_addr, &new->ndpr_mask);
ND6_WLOCK();
LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
V_nd6_list_genid++;
ND6_WUNLOCK();
/* ND_OPT_PI_FLAG_ONLINK processing */
if (new->ndpr_raf_onlink) {
struct epoch_tracker et;
ND6_ONLINK_LOCK();
NET_EPOCH_ENTER(et);
if ((error = nd6_prefix_onlink(new)) != 0) {
nd6log((LOG_ERR, "%s: failed to make the prefix %s/%d "
"on-link on %s (errno=%d)\n", __func__,
ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, if_name(pr->ndpr_ifp), error));
/* proceed anyway. XXX: is it correct? */
}
NET_EPOCH_EXIT(et);
ND6_ONLINK_UNLOCK();
}
if (dr != NULL)
pfxrtr_add(new, dr);
if (newp != NULL)
*newp = new;
return (0);
}
/*
* Remove a prefix from the prefix list and optionally stash it in a
* caller-provided list.
*
* The ND6 lock must be held.
*/
void
nd6_prefix_unlink(struct nd_prefix *pr, struct nd_prhead *list)
{
ND6_WLOCK_ASSERT();
LIST_REMOVE(pr, ndpr_entry);
V_nd6_list_genid++;
if (list != NULL)
LIST_INSERT_HEAD(list, pr, ndpr_entry);
}
/*
* Free an unlinked prefix, first marking it off-link if necessary.
*/
void
nd6_prefix_del(struct nd_prefix *pr)
{
struct nd_pfxrouter *pfr, *next;
int e;
char ip6buf[INET6_ADDRSTRLEN];
KASSERT(pr->ndpr_addrcnt == 0,
("prefix %p has referencing addresses", pr));
ND6_UNLOCK_ASSERT();
/*
* 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) {
ND6_ONLINK_LOCK();
if ((e = nd6_prefix_offlink(pr)) != 0) {
nd6log((LOG_ERR,
"%s: failed to make the prefix %s/%d offlink on %s "
"(errno=%d)\n", __func__,
ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
/* what should we do? */
}
ND6_ONLINK_UNLOCK();
}
/* Release references to routers that have advertised this prefix. */
ND6_WLOCK();
LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next)
pfxrtr_del(pfr);
ND6_WUNLOCK();
nd6_prefix_rele(pr);
pfxlist_onlink_check();
}
static int
prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
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 error = 0;
int auth;
struct in6_addrlifetime lt6_tmp;
char ip6buf[INET6_ADDRSTRLEN];
NET_EPOCH_ASSERT();
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_uptime;
}
if (new->ndpr_raf_onlink &&
(pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
ND6_ONLINK_LOCK();
if ((error = nd6_prefix_onlink(pr)) != 0) {
nd6log((LOG_ERR,
"%s: failed to make the prefix %s/%d "
"on-link on %s (errno=%d)\n", __func__,
ip6_sprintf(ip6buf,
&pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, if_name(pr->ndpr_ifp),
error));
/* proceed anyway. XXX: is it correct? */
}
ND6_ONLINK_UNLOCK();
}
if (dr != NULL)
pfxrtr_add(pr, dr);
} else {
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, &pr);
if (error != 0) {
nd6log((LOG_NOTICE, "%s: nd6_prelist_add() failed for "
"the prefix %s/%d on %s (errno=%d)\n", __func__,
ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
new->ndpr_plen, if_name(new->ndpr_ifp), error));
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 (pr->ndpr_raf_onlink == 0) {
pr->ndpr_vltime = 0;
pr->ndpr_pltime = 0;
in6_init_prefix_ltimes(pr);
}
}
/*
* 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".
*/
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
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_uptime - 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_uptime - 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, &lt6_tmp);
/*
* We need to treat lifetimes for temporary addresses
* differently, according to
* draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
* we only update the lifetimes when they are in the maximum
* intervals.
*/
if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
u_int32_t maxvltime, maxpltime;
if (V_ip6_temp_valid_lifetime >
(u_int32_t)((time_uptime - ifa6->ia6_createtime) +
V_ip6_desync_factor)) {
maxvltime = V_ip6_temp_valid_lifetime -
(time_uptime - ifa6->ia6_createtime) -
V_ip6_desync_factor;
} else
maxvltime = 0;
if (V_ip6_temp_preferred_lifetime >
(u_int32_t)((time_uptime - ifa6->ia6_createtime) +
V_ip6_desync_factor)) {
maxpltime = V_ip6_temp_preferred_lifetime -
(time_uptime - ifa6->ia6_createtime) -
V_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_uptime;
}
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,
"%s: invalid prefixlen %d for %s, ignored\n",
__func__, 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_addrcnt++;
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 (V_ip6_use_tempaddr) {
int e;
if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
nd6log((LOG_NOTICE, "%s: failed to "
"create a temporary address "
"(errno=%d)\n", __func__, e));
}
}
ifa_free(&ia6->ia_ifa);
/*
* 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:
if (pr != NULL)
nd6_prefix_rele(pr);
return (error);
}
/*
* A supplement function used in the on-link detection below;
* detect if a given prefix has a (probably) reachable advertising router.
* XXX: lengthy function name...
*/
static struct nd_pfxrouter *
find_pfxlist_reachable_router(struct nd_prefix *pr)
{
struct epoch_tracker et;
struct nd_pfxrouter *pfxrtr;
struct llentry *ln;
int canreach;
ND6_LOCK_ASSERT();
NET_EPOCH_ENTER(et);
LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) {
ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
if (ln == NULL)
continue;
canreach = ND6_IS_LLINFO_PROBREACH(ln);
LLE_RUNLOCK(ln);
if (canreach)
break;
}
NET_EPOCH_EXIT(et);
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 regard
* 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(void)
{
struct nd_prefix *pr;
struct in6_ifaddr *ifa;
struct nd_defrouter *dr;
struct nd_pfxrouter *pfxrtr = NULL;
struct rm_priotracker in6_ifa_tracker;
uint64_t genid;
uint32_t flags;
ND6_ONLINK_LOCK();
ND6_RLOCK();
/*
* Check if there is a prefix that has a reachable advertising
* router.
*/
LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
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) {
TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
struct nd_prefix *pr0;
LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) {
if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
break;
}
if (pfxrtr != NULL)
break;
}
}
if (pr != NULL || (!TAILQ_EMPTY(&V_nd6_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.
*/
LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
/* XXX: a link-local prefix should never be detached */
if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
pr->ndpr_raf_onlink == 0 ||
pr->ndpr_raf_auto == 0)
continue;
if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
find_pfxlist_reachable_router(pr) == NULL)
pr->ndpr_stateflags |= NDPRF_DETACHED;
else if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
find_pfxlist_reachable_router(pr) != NULL)
pr->ndpr_stateflags &= ~NDPRF_DETACHED;
}
} else {
/* there is no prefix that has a reachable router */
LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
pr->ndpr_raf_onlink == 0 ||
pr->ndpr_raf_auto == 0)
continue;
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.
*/
restart:
LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
char ip6buf[INET6_ADDRSTRLEN];
int e;
if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) ||
pr->ndpr_raf_onlink == 0 ||
pr->ndpr_raf_auto == 0)
continue;
flags = pr->ndpr_stateflags & (NDPRF_DETACHED | NDPRF_ONLINK);
if (flags == 0 || flags == (NDPRF_DETACHED | NDPRF_ONLINK)) {
genid = V_nd6_list_genid;
ND6_RUNLOCK();
if ((flags & NDPRF_ONLINK) != 0 &&
(e = nd6_prefix_offlink(pr)) != 0) {
nd6log((LOG_ERR,
"%s: failed to make %s/%d offlink "
"(errno=%d)\n", __func__,
ip6_sprintf(ip6buf,
&pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, e));
} else if ((flags & NDPRF_ONLINK) == 0 &&
(e = nd6_prefix_onlink(pr)) != 0) {
nd6log((LOG_ERR,
"%s: failed to make %s/%d onlink "
"(errno=%d)\n", __func__,
ip6_sprintf(ip6buf,
&pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, e));
}
ND6_RLOCK();
if (genid != V_nd6_list_genid)
goto restart;
}
}
/*
* 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.
*/
IN6_IFADDR_RLOCK(&in6_ifa_tracker);
CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
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) {
CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
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 {
CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
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);
}
}
}
IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
ND6_RUNLOCK();
ND6_ONLINK_UNLOCK();
}
/*
* Add or remove interface route specified by @dst, @netmask and @ifp.
* ifa can be NULL.
* Returns 0 on success
*/
static int
nd6_prefix_rtrequest(uint32_t fibnum, int cmd, struct sockaddr_in6 *dst,
struct sockaddr_in6 *netmask, struct ifnet *ifp, struct ifaddr *ifa)
{
struct epoch_tracker et;
int error;
/* Prepare gateway */
struct sockaddr_dl_short sdl = {
.sdl_family = AF_LINK,
.sdl_len = sizeof(struct sockaddr_dl_short),
.sdl_type = ifp->if_type,
.sdl_index = ifp->if_index,
};
struct rt_addrinfo info = {
.rti_ifa = ifa,
.rti_flags = RTF_PINNED | ((netmask != NULL) ? 0 : RTF_HOST),
.rti_info = {
[RTAX_DST] = (struct sockaddr *)dst,
[RTAX_NETMASK] = (struct sockaddr *)netmask,
[RTAX_GATEWAY] = (struct sockaddr *)&sdl,
},
};
/* Don't set additional per-gw filters on removal */
NET_EPOCH_ENTER(et);
error = rib_handle_ifaddr_info(fibnum, cmd, &info);
NET_EPOCH_EXIT(et);
return (error);
}
static int
nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa)
{
int error;
struct sockaddr_in6 mask6 = {
.sin6_family = AF_INET6,
.sin6_len = sizeof(struct sockaddr_in6),
.sin6_addr = pr->ndpr_mask,
};
struct sockaddr_in6 *pmask6 = (pr->ndpr_plen != 128) ? &mask6 : NULL;
error = nd6_prefix_rtrequest(pr->ndpr_ifp->if_fib, RTM_ADD,
&pr->ndpr_prefix, pmask6, pr->ndpr_ifp, ifa);
if (error == 0)
pr->ndpr_stateflags |= NDPRF_ONLINK;
return (error);
}
static int
nd6_prefix_onlink(struct nd_prefix *pr)
{
struct epoch_tracker et;
struct ifaddr *ifa;
struct ifnet *ifp = pr->ndpr_ifp;
struct nd_prefix *opr;
char ip6buf[INET6_ADDRSTRLEN];
int error;
ND6_ONLINK_LOCK_ASSERT();
ND6_UNLOCK_ASSERT();
if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0)
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.
*/
ND6_RLOCK();
LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
if (opr == pr)
continue;
if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
continue;
if (!V_rt_add_addr_allfibs &&
opr->ndpr_ifp->if_fib != pr->ndpr_ifp->if_fib)
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)) {
ND6_RUNLOCK();
return (0);
}
}
ND6_RUNLOCK();
/*
* We prefer link-local addresses as the associated interface address.
*/
/* search for a link-local addr */
NET_EPOCH_ENTER(et);
ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
if (ifa == NULL) {
/* XXX: freebsd does not have ifa_ifwithaf */
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family == AF_INET6) {
ifa_ref(ifa);
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,
"%s: failed to find any ifaddr to add route for a "
"prefix(%s/%d) on %s\n", __func__,
ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, if_name(ifp)));
error = 0;
} else {
error = nd6_prefix_onlink_rtrequest(pr, ifa);
ifa_free(ifa);
}
NET_EPOCH_EXIT(et);
return (error);
}
int
nd6_prefix_offlink(struct nd_prefix *pr)
{
int error = 0;
struct ifnet *ifp = pr->ndpr_ifp;
struct nd_prefix *opr;
struct sockaddr_in6 sa6;
char ip6buf[INET6_ADDRSTRLEN];
uint64_t genid;
int a_failure;
ND6_ONLINK_LOCK_ASSERT();
ND6_UNLOCK_ASSERT();
if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0)
return (EEXIST);
struct sockaddr_in6 mask6 = {
.sin6_family = AF_INET6,
.sin6_len = sizeof(struct sockaddr_in6),
.sin6_addr = pr->ndpr_mask,
};
struct sockaddr_in6 *pmask6 = (pr->ndpr_plen != 128) ? &mask6 : NULL;
error = nd6_prefix_rtrequest(ifp->if_fib, RTM_DELETE,
&pr->ndpr_prefix, pmask6, ifp, NULL);
a_failure = 1;
if (error == 0) {
pr->ndpr_stateflags &= ~NDPRF_ONLINK;
/*
* 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.
*/
ND6_RLOCK();
restart:
LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
/*
* KAME specific: detached prefixes should not be
* on-link.
*/
if (opr == pr || (opr->ndpr_stateflags &
(NDPRF_ONLINK | 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;
genid = V_nd6_list_genid;
ND6_RUNLOCK();
if ((e = nd6_prefix_onlink(opr)) != 0) {
nd6log((LOG_ERR,
"%s: failed to recover a prefix "
"%s/%d from %s to %s (errno=%d)\n",
__func__, ip6_sprintf(ip6buf,
&opr->ndpr_prefix.sin6_addr),
opr->ndpr_plen, if_name(ifp),
if_name(opr->ndpr_ifp), e));
} else
a_failure = 0;
ND6_RLOCK();
if (genid != V_nd6_list_genid)
goto restart;
}
}
ND6_RUNLOCK();
} else {
/* XXX: can we still set the NDPRF_ONLINK flag? */
nd6log((LOG_ERR,
"%s: failed to delete route: %s/%d on %s (errno=%d)\n",
__func__, ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, if_name(ifp), error));
}
if (a_failure)
lltable_prefix_free(AF_INET6, (struct sockaddr *)&sa6,
(struct sockaddr *)&mask6, LLE_STATIC);
return (error);
}
/*
* ia0 - corresponding public address
*/
int
in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
{
struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
struct in6_ifaddr *newia;
struct in6_aliasreq ifra;
int error;
int trylimit = 3; /* XXX: adhoc value */
int updateflags;
u_int32_t randid[2];
time_t vltime0, pltime0;
in6_prepare_ifra(&ifra, &ia0->ia_addr.sin6_addr,
&ia0->ia_prefixmask.sin6_addr);
ifra.ifra_addr = ia0->ia_addr; /* XXX: do we need this ? */
/* clear the old IFID */
IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr,
&ifra.ifra_prefixmask.sin6_addr);
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, "%s: failed to find a good random IFID\n",
__func__));
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.
*/
if (in6_localip(&ifra.ifra_addr.sin6_addr) != 0) {
if (trylimit-- > 0) {
forcegen = 1;
goto again;
}
/* Give up. Something strange should have happened. */
nd6log((LOG_NOTICE, "%s: failed to find a unique random IFID\n",
__func__));
return (EEXIST);
}
/*
* The Valid Lifetime is the lower of the Valid Lifetime of the
* public address or TEMP_VALID_LIFETIME.
* The Preferred Lifetime is the lower of the Preferred Lifetime
* of the public address or TEMP_PREFERRED_LIFETIME -
* DESYNC_FACTOR.
*/
if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
(ia0->ia6_lifetime.ia6t_vltime -
(time_uptime - ia0->ia6_updatetime));
if (vltime0 > V_ip6_temp_valid_lifetime)
vltime0 = V_ip6_temp_valid_lifetime;
} else
vltime0 = V_ip6_temp_valid_lifetime;
if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
(ia0->ia6_lifetime.ia6t_pltime -
(time_uptime - ia0->ia6_updatetime));
if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
pltime0 = V_ip6_temp_preferred_lifetime -
V_ip6_desync_factor;
}
} else
pltime0 = V_ip6_temp_preferred_lifetime - V_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 <= V_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,
"%s: ifa update succeeded, but we got no ifaddr\n",
__func__));
return (EINVAL); /* XXX */
}
newia->ia6_ndpr = ia0->ia6_ndpr;
newia->ia6_ndpr->ndpr_addrcnt++;
ifa_free(&newia->ia_ifa);
/*
* 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
rt6_deleteroute(const struct rtentry *rt, const struct nhop_object *nh,
void *arg)
{
struct in6_addr *gate = (struct in6_addr *)arg;
int nh_rt_flags;
if (nh->gw_sa.sa_family != AF_INET6)
return (0);
if (!IN6_ARE_ADDR_EQUAL(gate, &nh->gw6_sa.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?
*/
nh_rt_flags = nhop_get_rtflags(nh);
if ((nh_rt_flags & RTF_STATIC) != 0)
return (0);
/*
* We delete only host route. This means, in particular, we don't
* delete default route.
*/
if ((nh_rt_flags & RTF_HOST) == 0)
return (0);
return (1);
#undef SIN6
}
/*
* 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(struct in6_addr *gateway, struct ifnet *ifp)
{
/* We'll care only link-local addresses */
if (!IN6_IS_ADDR_LINKLOCAL(gateway))
return;
/* XXX Do we really need to walk any but the default FIB? */
rib_foreach_table_walk_del(AF_INET6, rt6_deleteroute, (void *)gateway);
}
int
nd6_setdefaultiface(int ifindex)
{
int error = 0;
if (ifindex < 0 || V_if_index < ifindex)
return (EINVAL);
if (ifindex != 0 && !ifnet_byindex(ifindex))
return (EINVAL);
if (V_nd6_defifindex != ifindex) {
V_nd6_defifindex = ifindex;
if (V_nd6_defifindex > 0)
V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
else
V_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(V_nd6_defifp);
}
return (error);
}
bool
nd6_defrouter_list_empty(void)
{
return (TAILQ_EMPTY(&V_nd6_defrouter));
}
void
nd6_defrouter_timer(void)
{
struct nd_defrouter *dr, *ndr;
struct nd6_drhead drq;
TAILQ_INIT(&drq);
ND6_WLOCK();
TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr)
if (dr->expire && dr->expire < time_uptime)
defrouter_unlink(dr, &drq);
ND6_WUNLOCK();
while ((dr = TAILQ_FIRST(&drq)) != NULL) {
TAILQ_REMOVE(&drq, dr, dr_entry);
defrouter_del(dr);
}
}
/*
* Nuke default router list entries toward ifp.
* We defer removal of default router list entries that is installed in the
* routing table, in order to keep additional side effects as small as possible.
*/
void
nd6_defrouter_purge(struct ifnet *ifp)
{
struct nd_defrouter *dr, *ndr;
struct nd6_drhead drq;
TAILQ_INIT(&drq);
ND6_WLOCK();
TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) {
if (dr->installed)
continue;
if (dr->ifp == ifp)
defrouter_unlink(dr, &drq);
}
TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) {
if (!dr->installed)
continue;
if (dr->ifp == ifp)
defrouter_unlink(dr, &drq);
}
ND6_WUNLOCK();
/* Delete the unlinked router objects. */
while ((dr = TAILQ_FIRST(&drq)) != NULL) {
TAILQ_REMOVE(&drq, dr, dr_entry);
defrouter_del(dr);
}
}
void
nd6_defrouter_flush_all(void)
{
struct nd_defrouter *dr;
struct nd6_drhead drq;
TAILQ_INIT(&drq);
ND6_WLOCK();
while ((dr = TAILQ_FIRST(&V_nd6_defrouter)) != NULL)
defrouter_unlink(dr, &drq);
ND6_WUNLOCK();
while ((dr = TAILQ_FIRST(&drq)) != NULL) {
TAILQ_REMOVE(&drq, dr, dr_entry);
defrouter_del(dr);
}
}
void
nd6_defrouter_init(void)
{
TAILQ_INIT(&V_nd6_defrouter);
}
static int
nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
{
struct in6_defrouter d;
struct nd_defrouter *dr;
int error;
if (req->newptr != NULL)
return (EPERM);
error = sysctl_wire_old_buffer(req, 0);
if (error != 0)
return (error);
bzero(&d, sizeof(d));
d.rtaddr.sin6_family = AF_INET6;
d.rtaddr.sin6_len = sizeof(d.rtaddr);
ND6_RLOCK();
TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) {
d.rtaddr.sin6_addr = dr->rtaddr;
error = sa6_recoverscope(&d.rtaddr);
if (error != 0)
break;
d.flags = dr->raflags;
d.rtlifetime = dr->rtlifetime;
d.expire = dr->expire + (time_second - time_uptime);
d.if_index = dr->ifp->if_index;
error = SYSCTL_OUT(req, &d, sizeof(d));
if (error != 0)
break;
}
ND6_RUNLOCK();
return (error);
}
SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
NULL, 0, nd6_sysctl_drlist, "S,in6_defrouter",
"NDP default router list");
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