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Code Issues Releases Activity

Fix lagg failover due to missing notifications

Browse Source 
When using lagg failover mode neither Gratuitous ARP (IPv4) or Unsolicited
Neighbour Advertisements (IPv6) are sent to notify other nodes that the
address may have moved.

This results is slow failover, dropped packets and network outages for the
lagg interface when the primary link goes down.

We now use the new if_link_state_change_cond with the force param set to
allow lagg to force through link state changes and hence fire a
ifnet_link_event which are now monitored by rip and nd6.

Upon receiving these events each protocol trigger the relevant
notifications:
* inet4 => Gratuitous ARP
* inet6 => Unsolicited Neighbour Announce

This also fixes the carp IPv6 NA's that stopped working after r251584 which
added the ipv6_route__llma route.

The new behavour can be controlled using the sysctls:
* net.link.ether.inet.arp_on_link
* net.inet6.icmp6.nd6_on_link

Also removed unused param from lagg_port_state and added descriptions for the
sysctls while here.

PR:		156226
MFC after:	1 month
Sponsored by:	Multiplay
Differential Revision:	https://reviews.freebsd.org/D4111
This commit is contained in:
Steven Hartland 2015-12-15 16:02:11 +00:00
parent 6d652b139e
commit 52e53e2de0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=292275
13 changed files with 285 additions and 67 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
sys/net/if.c
View File

@ -126,7 +126,7 @@ SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr");
void (*bridge_linkstate_p)(struct ifnet *ifp);
void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
void (*lagg_linkstate_p)(struct ifnet *ifp, int state);
void (*lagg_linkstate_p)(struct ifnet *ifp);
/* These are external hooks for CARP. */
void (*carp_linkstate_p)(struct ifnet *ifp);
void (*carp_demote_adj_p)(int, char *);
@ -1984,6 +1984,8 @@ if_unroute(struct ifnet *ifp, int flag, int fam)
if (ifp->if_carp)
(*carp_linkstate_p)(ifp);
if (ifp->if_lagg)
(*lagg_linkstate_p)(ifp);
rt_ifmsg(ifp);
}
@ -2005,6 +2007,8 @@ if_route(struct ifnet *ifp, int flag, int fam)
pfctlinput(PRC_IFUP, ifa->ifa_addr);
if (ifp->if_carp)
(*carp_linkstate_p)(ifp);
if (ifp->if_lagg)
(*lagg_linkstate_p)(ifp);
rt_ifmsg(ifp);
#ifdef INET6
in6_if_up(ifp);
@ -2019,17 +2023,27 @@ int (*vlan_tag_p)(struct ifnet *, uint16_t *);
int (*vlan_setcookie_p)(struct ifnet *, void *);
void *(*vlan_cookie_p)(struct ifnet *);
void
if_link_state_change(struct ifnet *ifp, int link_state)
{
return if_link_state_change_cond(ifp, link_state, 0);
}
/*
* Handle a change in the interface link state. To avoid LORs
* between driver lock and upper layer locks, as well as possible
* recursions, we post event to taskqueue, and all job
* is done in static do_link_state_change().
*
* If the current link state matches link_state and force isn't
* specified no action is taken.
*/
void
if_link_state_change(struct ifnet *ifp, int link_state)
if_link_state_change_cond(struct ifnet *ifp, int link_state, int force)
{
/* Return if state hasn't changed. */
if (ifp->if_link_state == link_state)
if (ifp->if_link_state == link_state && !force)
return;
ifp->if_link_state = link_state;
@ -2057,7 +2071,7 @@ do_link_state_change(void *arg, int pending)
if (ifp->if_bridge)
(*bridge_linkstate_p)(ifp);
if (ifp->if_lagg)
(*lagg_linkstate_p)(ifp, link_state);
(*lagg_linkstate_p)(ifp);
if (IS_DEFAULT_VNET(curvnet))
devctl_notify("IFNET", ifp->if_xname,

13
sys/net/if_lagg.c
View File

@ -106,7 +106,7 @@ static int lagg_port_create(struct lagg_softc *, struct ifnet *);
static int lagg_port_destroy(struct lagg_port *, int);
static struct mbuf *lagg_input(struct ifnet *, struct mbuf *);
static void lagg_linkstate(struct lagg_softc *);
static void lagg_port_state(struct ifnet *, int);
static void lagg_port_state(struct ifnet *);
static int lagg_port_ioctl(struct ifnet *, u_long, caddr_t);
static int lagg_port_output(struct ifnet *, struct mbuf *,
const struct sockaddr *, struct route *);
@ -1774,7 +1774,12 @@ lagg_linkstate(struct lagg_softc *sc)
break;
}
}
if_link_state_change(sc->sc_ifp, new_link);
/*
* Force state change to ensure ifnet_link_event is generated allowing
* protocols to notify other nodes of potential address move.
*/
if_link_state_change_cond(sc->sc_ifp, new_link, 1);
/* Update if_baudrate to reflect the max possible speed */
switch (sc->sc_proto) {
@ -1797,7 +1802,7 @@ lagg_linkstate(struct lagg_softc *sc)
}
static void
lagg_port_state(struct ifnet *ifp, int state)
lagg_port_state(struct ifnet *ifp)
{
struct lagg_port *lp = (struct lagg_port *)ifp->if_lagg;
struct lagg_softc *sc = NULL;
@ -1813,7 +1818,7 @@ lagg_port_state(struct ifnet *ifp, int state)
LAGG_WUNLOCK(sc);
}
struct lagg_port *
static struct lagg_port *
lagg_link_active(struct lagg_softc *sc, struct lagg_port *lp)
{
struct lagg_port *lp_next, *rval = NULL;

2
sys/net/if_lagg.h
View File

@ -281,7 +281,7 @@ struct lagg_port {
#define LAGG_UNLOCK_ASSERT(_sc) rm_assert(&(_sc)->sc_mtx, RA_UNLOCKED)
extern struct mbuf *(*lagg_input_p)(struct ifnet *, struct mbuf *);
extern void (*lagg_linkstate_p)(struct ifnet *, int );
extern void (*lagg_linkstate_p)(struct ifnet *);
int lagg_enqueue(struct ifnet *, struct mbuf *);

1
sys/net/if_var.h
View File

@ -500,6 +500,7 @@ struct ifmultiaddr *
void if_free(struct ifnet *);
void if_initname(struct ifnet *, const char *, int);
void if_link_state_change(struct ifnet *, int);
void if_link_state_change_cond(struct ifnet *, int, int);
int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
void if_ref(struct ifnet *);
void if_rele(struct ifnet *);

95
sys/netinet/if_ether.c
View File

@ -107,6 +107,7 @@ VNET_PCPUSTAT_SYSUNINIT(arpstat);
#endif /* VIMAGE */
static VNET_DEFINE(int, arp_maxhold) = 1;
static VNET_DEFINE(int, arp_on_link) = 1;
#define V_arpt_keep VNET(arpt_keep)
#define V_arpt_down VNET(arpt_down)
@ -114,6 +115,7 @@ static VNET_DEFINE(int, arp_maxhold) = 1;
#define V_arp_maxtries VNET(arp_maxtries)
#define V_arp_proxyall VNET(arp_proxyall)
#define V_arp_maxhold VNET(arp_maxhold)
#define V_arp_on_link VNET(arp_on_link)
SYSCTL_INT(_net_link_ether_inet, OID_AUTO, max_age, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(arpt_keep), 0,
@ -136,6 +138,9 @@ SYSCTL_INT(_net_link_ether_inet, OID_AUTO, max_log_per_second,
CTLFLAG_RW, &arp_maxpps, 0,
"Maximum number of remotely triggered ARP messages that can be "
"logged per second");
SYSCTL_INT(_net_link_ether_inet, OID_AUTO, arp_on_link, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(arp_on_link), 0,
"Send gratuitous ARP's on interface link up events");
#define ARP_LOG(pri, ...) do { \
if (ppsratecheck(&arp_lastlog, &arp_curpps, arp_maxpps)) \
@ -156,6 +161,7 @@ static void arp_mark_lle_reachable(struct llentry *la);
static void arp_iflladdr(void *arg __unused, struct ifnet *ifp);
static eventhandler_tag iflladdr_tag;
static eventhandler_tag ifnet_link_event_tag;
static const struct netisr_handler arp_nh = {
.nh_name = "arp",
@ -1176,43 +1182,96 @@ arp_ifinit(struct ifnet *ifp, struct ifaddr *ifa)
if (ntohl(dst_in->sin_addr.s_addr) == INADDR_ANY)
return;
arp_announce_ifaddr(ifp, dst_in->sin_addr, IF_LLADDR(ifp));
arp_announce_addr(ifp, &dst_in->sin_addr, IF_LLADDR(ifp));
arp_add_ifa_lle(ifp, dst);
}
void
arp_announce_ifaddr(struct ifnet *ifp, struct in_addr addr, u_char *enaddr)
void __noinline
arp_announce_addr(struct ifnet *ifp, const struct in_addr *addr, u_char *enaddr)
{
if (ntohl(addr.s_addr) != INADDR_ANY)
arprequest(ifp, &addr, &addr, enaddr);
if (ntohl(addr->s_addr) != INADDR_ANY)
arprequest(ifp, addr, addr, enaddr);
}
/*
* Sends gratuitous ARPs for each ifaddr to notify other
* nodes about the address change.
* Send gratuitous ARPs for all interfaces addresses to notify other nodes of
* changes.
*
* This is a noop if the interface isn't up or has been flagged for no ARP.
*/
static __noinline void
arp_handle_ifllchange(struct ifnet *ifp)
void __noinline
arp_announce(struct ifnet *ifp)
{
int i, cnt, entries;
u_char *lladdr;
struct ifaddr *ifa;
struct in_addr *addr, *head;
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family == AF_INET)
arp_ifinit(ifp, ifa);
if (!(ifp->if_flags & IFF_UP) || (ifp->if_flags & IFF_NOARP))
return;
entries = 8;
cnt = 0;
head = malloc(sizeof(*addr) * entries, M_TEMP, M_NOWAIT);
if (head == NULL) {
log(LOG_INFO, "arp_announce: malloc %d entries failed\n",
entries);
return;
}
/* Take a copy then process to avoid locking issues. */
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
if (cnt == entries) {
addr = (struct in_addr *)realloc(head, sizeof(*addr) *
(entries + 8), M_TEMP, M_NOWAIT);
if (addr == NULL) {
log(LOG_INFO, "arp_announce: realloc to %d "
"entries failed\n", entries + 8);
/* Process what we have. */
break;
}
entries += 8;
head = addr;
}
addr = head + cnt;
bcopy(IFA_IN(ifa), addr, sizeof(*addr));
cnt++;
}
IF_ADDR_RUNLOCK(ifp);
lladdr = IF_LLADDR(ifp);
for (i = 0; i < cnt; i++) {
arp_announce_addr(ifp, head + i, lladdr);
}
free(head, M_TEMP);
}
/*
* A handler for interface link layer address change event.
* A handler for interface linkstate change events.
*/
static void
arp_ifnet_link_event(void *arg __unused, struct ifnet *ifp, int linkstate)
{
if (linkstate == LINK_STATE_UP && V_arp_on_link)
arp_announce(ifp);
}
/*
* A handler for interface link layer address change events.
*/
static __noinline void
arp_iflladdr(void *arg __unused, struct ifnet *ifp)
{
if ((ifp->if_flags & IFF_UP) != 0)
arp_handle_ifllchange(ifp);
arp_announce(ifp);
}
static void
@ -1220,8 +1279,12 @@ arp_init(void)
{
netisr_register(&arp_nh);
if (IS_DEFAULT_VNET(curvnet))
if (IS_DEFAULT_VNET(curvnet)) {
iflladdr_tag = EVENTHANDLER_REGISTER(iflladdr_event,
arp_iflladdr, NULL, EVENTHANDLER_PRI_ANY);
ifnet_link_event_tag = EVENTHANDLER_REGISTER(ifnet_link_event,
arp_ifnet_link_event, 0, EVENTHANDLER_PRI_ANY);
}
}
SYSINIT(arp, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, arp_init, 0);

3
sys/netinet/if_ether.h
View File

@ -119,7 +119,8 @@ int arpresolve(struct ifnet *ifp, int is_gw, struct mbuf *m,
void arprequest(struct ifnet *, const struct in_addr *,
const struct in_addr *, u_char *);
void arp_ifinit(struct ifnet *, struct ifaddr *);
void arp_announce_ifaddr(struct ifnet *, struct in_addr addr, u_char *);
void arp_announce(struct ifnet *);
void arp_announce_addr(struct ifnet *, const struct in_addr *addr, u_char *);
#endif
#endif

3
sys/netinet/in_var.h
View File

@ -129,6 +129,9 @@ extern struct rmlock in_ifaddr_lock;
#define IN_IFADDR_WLOCK_ASSERT() rm_assert(&in_ifaddr_lock, RA_WLOCKED)
#define IN_IFADDR_WUNLOCK() rm_wunlock(&in_ifaddr_lock)
#define IFA_IN(ifa) \
(&((struct sockaddr_in *)ifa->ifa_addr)->sin_addr)
/*
* Macro for finding the internet address structure (in_ifaddr)
* corresponding to one of our IP addresses (in_addr).

17
sys/netinet/ip_carp.c
View File

@ -1009,13 +1009,12 @@ static void
carp_send_arp(struct carp_softc *sc)
{
struct ifaddr *ifa;
struct in_addr addr;
CARP_FOREACH_IFA(sc, ifa) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
addr = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
arp_announce_ifaddr(sc->sc_carpdev, addr, LLADDR(&sc->sc_addr));
arp_announce_addr(sc->sc_carpdev, IFA_IN(ifa),
LLADDR(&sc->sc_addr));
}
}
@ -1037,18 +1036,16 @@ carp_iamatch(struct ifaddr *ifa, uint8_t **enaddr)
static void
carp_send_na(struct carp_softc *sc)
{
static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
struct ifaddr *ifa;
struct in6_addr *in6;
CARP_FOREACH_IFA(sc, ifa) {
if (ifa->ifa_addr->sa_family != AF_INET6)
if (ifa->ifa_addr->sa_family != AF_INET6 ||
IFA_ND6_NA_UNSOLICITED_SKIP(ifa))
continue;
in6 = IFA_IN6(ifa);
nd6_na_output(sc->sc_carpdev, &mcast, in6,
ND_NA_FLAG_OVERRIDE, 1, NULL);
DELAY(1000); /* XXX */
nd6_na_output_unsolicited_addr(sc->sc_carpdev, IFA_IN6(ifa),
IFA_ND6_NA_BASE_FLAGS(sc->sc_carpdev, ifa));
nd6_na_unsolicited_addr_delay(ifa);
}
}

2
sys/netinet6/in6.c
View File

@ -114,7 +114,7 @@ VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix);
#define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix)
/*
* Definitions of some costant IP6 addresses.
* Definitions of some constant IP6 addresses.
*/
const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;

10
sys/netinet6/in6_var.h
View File

@ -399,6 +399,16 @@ struct in6_rrenumreq {
#define IA6_SIN6(ia) (&((ia)->ia_addr))
#define IA6_DSTSIN6(ia) (&((ia)->ia_dstaddr))
#define IFA_IN6(x) (&((struct sockaddr_in6 *)((x)->ifa_addr))->sin6_addr)
#define IFA_IN6_FLAGS(ifa) ((struct in6_ifaddr *)ifa)->ia6_flags
#define IFA_ND6_NA_BASE_FLAGS(ifp, ifa) \
(IFA_IN6_FLAGS(ifa) & IN6_IFF_ANYCAST ? 0 : ND_NA_FLAG_OVERRIDE) | \
((V_ip6_forwarding && !(ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && \
V_ip6_norbit_raif)) ? ND_NA_FLAG_ROUTER : 0)
#define IFA_ND6_NA_UNSOLICITED_SKIP(ifa) \
(IFA_IN6_FLAGS(ifa) & (IN6_IFF_DUPLICATED | IN6_IFF_DEPRECATED | \
IN6_IFF_TENTATIVE)) != 0
#define IN6_MAX_ANYCAST_DELAY_TIME_MS 1000000
#define IN6_BROADCAST_DELAY_TIME_MS 1000
#define IFA_DSTIN6(x) (&((struct sockaddr_in6 *)((x)->ifa_dstaddr))->sin6_addr)
#define IFPR_IN6(x) (&((struct sockaddr_in6 *)((x)->ifpr_prefix))->sin6_addr)

35
sys/netinet6/nd6.c
View File

@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/random.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
@ -102,8 +103,12 @@ VNET_DEFINE(int, nd6_maxnudhint) = 0; /* max # of subsequent upper
* layer hints */
static VNET_DEFINE(int, nd6_maxqueuelen) = 1; /* max pkts cached in unresolved
* ND entries */
static VNET_DEFINE(int, nd6_on_link) = 1; /* Send unsolicited ND's on link up */
#define V_nd6_maxndopt VNET(nd6_maxndopt)
#define V_nd6_maxqueuelen VNET(nd6_maxqueuelen)
#define V_nd6_on_link VNET(nd6_on_link)
#ifdef ND6_DEBUG
VNET_DEFINE(int, nd6_debug) = 1;
@ -112,6 +117,7 @@ VNET_DEFINE(int, nd6_debug) = 0;
#endif
static eventhandler_tag lle_event_eh;
static eventhandler_tag ifnet_link_event_eh;
/* for debugging? */
#if 0
@ -196,6 +202,13 @@ nd6_lle_event(void *arg __unused, struct llentry *lle, int evt)
type == RTM_ADD ? RTF_UP: 0), 0, RT_DEFAULT_FIB);
}
static void
nd6_ifnet_link_event(void *arg __unused, struct ifnet *ifp, int linkstate)
{
if (linkstate == LINK_STATE_UP && V_nd6_on_link)
nd6_na_output_unsolicited(ifp);
}
void
nd6_init(void)
{
@ -211,9 +224,12 @@ nd6_init(void)
nd6_slowtimo, curvnet);
nd6_dad_init();
if (IS_DEFAULT_VNET(curvnet))
if (IS_DEFAULT_VNET(curvnet)) {
lle_event_eh = EVENTHANDLER_REGISTER(lle_event, nd6_lle_event,
NULL, EVENTHANDLER_PRI_ANY);
ifnet_link_event_eh = EVENTHANDLER_REGISTER(ifnet_link_event,
nd6_ifnet_link_event, NULL, EVENTHANDLER_PRI_ANY);
}
}
#ifdef VIMAGE
@ -223,8 +239,10 @@ nd6_destroy()
callout_drain(&V_nd6_slowtimo_ch);
callout_drain(&V_nd6_timer_ch);
if (IS_DEFAULT_VNET(curvnet))
if (IS_DEFAULT_VNET(curvnet)) {
EVENTHANDLER_DEREGISTER(lle_event, lle_event_eh);
EVENTHANDLER_DEREGISTER(ifnet_link_event, ifnet_link_event_eh);
}
}
#endif
@ -2457,13 +2475,18 @@ static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS);
SYSCTL_DECL(_net_inet6_icmp6);
#endif
SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
CTLFLAG_RD, nd6_sysctl_drlist, "");
CTLFLAG_RD, nd6_sysctl_drlist, "List default routers");
SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist,
CTLFLAG_RD, nd6_sysctl_prlist, "");
CTLFLAG_RD, nd6_sysctl_prlist, "List prefixes");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXQLEN, nd6_maxqueuelen,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_maxqueuelen), 1, "");
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_maxqueuelen), 1,
"Max packets cached in unresolved ND entries");
SYSCTL_INT(_net_inet6_icmp6, OID_AUTO, nd6_gctimer,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_gctimer), (60 * 60 * 24), "");
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_gctimer), (60 * 60 * 24),
"Interface in seconds between garbage collection passes");
SYSCTL_INT(_net_inet6_icmp6, OID_AUTO, nd6_on_link, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(nd6_on_link), 0,
"Send unsolicited neighbor discovery on interface link up events");
static int
nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)

4
sys/netinet6/nd6.h
View File

@ -398,6 +398,10 @@ void nd6_init(void);
#ifdef VIMAGE
void nd6_destroy(void);
#endif
void nd6_na_output_unsolicited(struct ifnet *);
void nd6_na_output_unsolicited_addr(struct ifnet *, const struct in6_addr *,
u_long);
int nd6_na_unsolicited_addr_delay(struct ifaddr *);
struct nd_ifinfo *nd6_ifattach(struct ifnet *);
void nd6_ifdetach(struct nd_ifinfo *);
int nd6_is_addr_neighbor(const struct sockaddr_in6 *, struct ifnet *);

143
sys/netinet6/nd6_nbr.c
View File

@ -124,20 +124,16 @@ nd6_ns_input(struct mbuf *m, int off, int icmp6len)
struct in6_addr saddr6 = ip6->ip6_src;
struct in6_addr daddr6 = ip6->ip6_dst;
struct in6_addr taddr6;
struct in6_addr myaddr6;
char *lladdr = NULL;
struct ifaddr *ifa = NULL;
u_long flags;
int lladdrlen = 0;
int anycast = 0, proxy = 0, tentative = 0;
int proxy = 0;
int tlladdr;
int rflag;
union nd_opts ndopts;
struct sockaddr_dl proxydl;
char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0;
if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif)
rflag = 0;
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, icmp6len,);
nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
@ -229,10 +225,7 @@ nd6_ns_input(struct mbuf *m, int off, int icmp6len)
* In implementation, we add target link-layer address by default.
* We do not add one in MUST NOT cases.
*/
if (!IN6_IS_ADDR_MULTICAST(&daddr6))
tlladdr = 0;
else
tlladdr = 1;
tlladdr = !IN6_IS_ADDR_MULTICAST(&daddr6);
/*
* Target address (taddr6) must be either:
@ -289,9 +282,6 @@ nd6_ns_input(struct mbuf *m, int off, int icmp6len)
*/
goto freeit;
}
myaddr6 = *IFA_IN6(ifa);
anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
goto freeit;
@ -303,7 +293,7 @@ nd6_ns_input(struct mbuf *m, int off, int icmp6len)
goto bad;
}
if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &saddr6)) {
nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
ip6_sprintf(ip6bufs, &saddr6)));
goto freeit;
@ -321,7 +311,7 @@ nd6_ns_input(struct mbuf *m, int off, int icmp6len)
*
* The processing is defined in RFC 2462.
*/
if (tentative) {
if (IFA_IN6_FLAGS(ifa) & IN6_IFF_TENTATIVE) {
/*
* If source address is unspecified address, it is for
* duplicate address detection.
@ -335,6 +325,10 @@ nd6_ns_input(struct mbuf *m, int off, int icmp6len)
goto freeit;
}
flags = IFA_ND6_NA_BASE_FLAGS(ifp, ifa);
if (proxy || !tlladdr)
flags &= ~ND_NA_FLAG_OVERRIDE;
/*
* If the source address is unspecified address, entries must not
* be created or updated.
@ -349,20 +343,16 @@ nd6_ns_input(struct mbuf *m, int off, int icmp6len)
in6_all = in6addr_linklocal_allnodes;
if (in6_setscope(&in6_all, ifp, NULL) != 0)
goto bad;
nd6_na_output_fib(ifp, &in6_all, &taddr6,
((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
M_GETFIB(m));
nd6_na_output_fib(ifp, &in6_all, &taddr6, flags, tlladdr,
proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
goto freeit;
}
nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
ND_NEIGHBOR_SOLICIT, 0);
nd6_na_output_fib(ifp, &saddr6, &taddr6,
((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
rflag | ND_NA_FLAG_SOLICITED, tlladdr,
proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
nd6_na_output_fib(ifp, &saddr6, &taddr6, flags | ND_NA_FLAG_SOLICITED,
tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
freeit:
if (ifa != NULL)
ifa_free(ifa);
@ -1597,3 +1587,110 @@ nd6_dad_na_input(struct ifaddr *ifa)
nd6_dad_rele(dp);
}
}
/*
* Send unsolicited neighbor advertisements for all interface addresses to
* notify other nodes of changes.
*
* This is a noop if the interface isn't up.
*/
void __noinline
nd6_na_output_unsolicited(struct ifnet *ifp)
{
int i, cnt, entries;
struct ifaddr *ifa;
struct ann {
struct in6_addr addr;
u_long flags;
int delay;
} *ann1, *head;
if (!(ifp->if_flags & IFF_UP))
return;
entries = 8;
cnt = 0;
head = malloc(sizeof(struct ann) * entries, M_TEMP, M_WAITOK);
/* Take a copy then process to avoid locking issues. */
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET6 ||
IFA_ND6_NA_UNSOLICITED_SKIP(ifa))
continue;
if (cnt == entries) {
ann1 = (struct ann*)realloc(head, sizeof(struct ann) *
(entries + 8), M_TEMP, M_NOWAIT);
if (ann1 == NULL) {
log(LOG_INFO, "nd6_announce: realloc to %d "
"entries failed\n", entries + 8);
/* Process what we have. */
break;
}
entries += 8;
head = ann1;
}
ann1 = head + cnt;
bcopy(IFA_IN6(ifa), &ann1->addr, sizeof(ann1->addr));
ann1->flags = IFA_ND6_NA_BASE_FLAGS(ifp, ifa);
ann1->delay = nd6_na_unsolicited_addr_delay(ifa);
cnt++;
}
IF_ADDR_RUNLOCK(ifp);
for (i = 0; i < cnt;) {
ann1 = head + i;
nd6_na_output_unsolicited_addr(ifp, &ann1->addr, ann1->flags);
i++;
if (i == cnt)
break;
DELAY(ann1->delay);
}
free(head, M_TEMP);
}
/*
* Return the delay required for announcements of the address as per RFC 4861.
*/
int
nd6_na_unsolicited_addr_delay(struct ifaddr *ifa)
{
if (IFA_IN6_FLAGS(ifa) & IN6_IFF_ANYCAST) {
/*
* Random value between 0 and MAX_ANYCAST_DELAY_TIME
* as per section 7.2.7.
*/
return (random() % IN6_MAX_ANYCAST_DELAY_TIME_MS);
}
/* Small delay as per section 7.2.6. */
return (IN6_BROADCAST_DELAY_TIME_MS);
}
/*
* Send an unsolicited neighbor advertisement for an address to notify other
* nodes of changes.
*/
void __noinline
nd6_na_output_unsolicited_addr(struct ifnet *ifp, const struct in6_addr *addr,
u_long flags)
{
int error;
struct in6_addr mcast;
mcast = in6addr_linklocal_allnodes;
if ((error = in6_setscope(&mcast, ifp, NULL)) != 0) {
/*
* This shouldn't by possible as the only error is for loopback
* address which we're not using.
*/
log(LOG_INFO, "in6_setscope: on mcast failed: %d\n", error);
return;
}
nd6_na_output(ifp, &mcast, addr, flags, 1, NULL);
}