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| author | Michael Brown <mcb30@ipxe.org> | 2021-01-19 14:15:56 +0000 |
|---|---|---|
| committer | Michael Brown <mcb30@ipxe.org> | 2021-01-19 14:15:56 +0000 |
| commit | 3a9621a6fb9d7fda9dcab9efde6b5c586ceda470 (patch) | |
| tree | 6eb9322fbad5187139a0f4e5e4de15e17759b97e | |
| parent | 9a341203df7e6c658da970ecd208efdcf7a34570 (diff) | |
| download | ipxe-3a9621a6fb9d7fda9dcab9efde6b5c586ceda470.zip ipxe-3a9621a6fb9d7fda9dcab9efde6b5c586ceda470.tar.gz ipxe-3a9621a6fb9d7fda9dcab9efde6b5c586ceda470.tar.bz2 | |
[ipv6] Defer router discovery timeout while link is blocked
Signed-off-by: Michael Brown <mcb30@ipxe.org>
| -rw-r--r-- | src/net/ndp.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/src/net/ndp.c b/src/net/ndp.c index 241af68..75e5316 100644 --- a/src/net/ndp.c +++ b/src/net/ndp.c @@ -46,6 +46,12 @@ FILE_LICENCE ( GPL2_OR_LATER ); /** Router discovery maximum timeout */ #define IPV6CONF_MAX_TIMEOUT ( TICKS_PER_SEC * 3 ) +/** Router discovery blocked link retry timeout */ +#define IPV6CONF_BLOCK_TIMEOUT ( TICKS_PER_SEC ) + +/** Router discovery maximum number of deferrals */ +#define IPV6CONF_MAX_DEFERRALS 180 + static struct ipv6conf * ipv6conf_demux ( struct net_device *netdev ); static int ipv6conf_rx_router_advertisement ( struct net_device *netdev, @@ -1068,6 +1074,9 @@ struct ipv6conf { /** Retransmission timer */ struct retry_timer timer; + + /** Deferred discovery counter */ + unsigned int deferred; }; /** List of IPv6 configurators */ @@ -1131,6 +1140,7 @@ static void ipv6conf_done ( struct ipv6conf *ipv6conf, int rc ) { static void ipv6conf_expired ( struct retry_timer *timer, int fail ) { struct ipv6conf *ipv6conf = container_of ( timer, struct ipv6conf, timer ); + struct net_device *netdev = ipv6conf->netdev; /* If we have failed, terminate autoconfiguration */ if ( fail ) { @@ -1140,7 +1150,15 @@ static void ipv6conf_expired ( struct retry_timer *timer, int fail ) { /* Otherwise, transmit router solicitation and restart timer */ start_timer ( &ipv6conf->timer ); - ndp_tx_router_solicitation ( ipv6conf->netdev ); + ndp_tx_router_solicitation ( netdev ); + + /* If link is blocked, defer router discovery timeout */ + if ( netdev_link_blocked ( netdev ) && + ( ipv6conf->deferred++ <= IPV6CONF_MAX_DEFERRALS ) ) { + DBGC ( netdev, "NDP %s deferring discovery timeout\n", + netdev->name ); + start_timer_fixed ( &ipv6conf->timer, IPV6CONF_BLOCK_TIMEOUT ); + } } /** |