diff options
| author | Erik Kline <ek@google.com> | 2015-05-18 19:44:41 +0900 |
|---|---|---|
| committer | Lorenzo Colitti <lorenzo@google.com> | 2015-05-28 05:59:03 +0900 |
| commit | e4a6d6ba5a9e9e1796bbe6efe4f20ce7072df667 (patch) | |
| tree | d7b83687fe3e255a6ea3199aedd46647f56e92b3 /net | |
| parent | 9de69da198f3ae80ab10eeb564a0783e45a2c8c3 (diff) | |
neigh: Better handling of transition to NUD_PROBE state
[1] When entering NUD_PROBE state via neigh_update(), perhaps received
from userspace, correctly (re)initialize the probes count to zero.
This is useful for forcing revalidation of a neighbor (for example
if the host is attempting to do DNA [IPv4 4436, IPv6 6059]).
[2] Notify listeners when a neighbor goes into NUD_PROBE state.
By sending notifications on entry to NUD_PROBE state listeners get
more timely warnings of imminent connectivity issues.
The current notifications on entry to NUD_STALE have somewhat
limited usefulness: NUD_STALE is a perfectly normal state, as is
NUD_DELAY, whereas notifications on entry to NUD_FAILURE come after
a neighbor reachability problem has been confirmed (typically after
three probes).
Change-Id: I1d01d40ef3bc4753b0eaa79da2b27235425b1934
Signed-off-by: Erik Kline <ek@google.com>
Acked-By: Lorenzo Colitti <lorenzo@google.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/neighbour.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/core/neighbour.c b/net/core/neighbour.c index 5c56b217b999..703cd2ac5f29 100644 --- a/net/core/neighbour.c +++ b/net/core/neighbour.c @@ -926,6 +926,7 @@ static void neigh_timer_handler(unsigned long arg) neigh->nud_state = NUD_PROBE; neigh->updated = jiffies; atomic_set(&neigh->probes, 0); + notify = 1; next = now + neigh->parms->retrans_time; } } else { @@ -1153,6 +1154,8 @@ int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, if (new != old) { neigh_del_timer(neigh); + if (new & NUD_PROBE) + atomic_set(&neigh->probes, 0); if (new & NUD_IN_TIMER) neigh_add_timer(neigh, (jiffies + ((new & NUD_REACHABLE) ? |