We use a "softref" which is a magic pointer which gets NULL'ed when
the object is freed. But it's heavy, and a bit tricky to use, and we
only use it in gossipd.
Instead, keep the nodeid, and do a lookup (now that's fast) if we want
to credit the sender for valid gossip.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Without inheriting zombie status, gossipd would allow regular channel updates
into the store until the pruning cycle hits (and the channel is properly
flagged) which is 3.5 days. Applying zombie status when reading channel
updates from the store prevents this.
Changelog-None
This could always happen if we armed the timer when we did have public
channels, and by the time we did our node_announcement we no longer
did, but it gets triggered in our tests when we remove (our own!)
zombied node_announcement in the next patch.
Though BOLT 7 says a channel may be pruned when one side becomes inactive
and fails to refresh their channel_update, in practice, the
channel_announcement can be difficult to recover if deleted entirely.
Here the channel_announcement is tagged as zombie such that gossip_store
consumers may safely ignore it, but it may be retained should the channel
come back online in the future. Node_announcements and channel_updates may
also be retained in such a fashion until the channel is ready to be
resurrected.
Changelog-Fixed: Pruned channels are more reliably restored.
This adds a new "chan_dying" message to the gossip_store, but since we
already changed the minor version in this PR, we don't bump it again.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Added: Protocol: We now delay forgetting funding-spent channels for 12 blocks (as per latest BOLTs, to support splicing in future).
routing.c fixed to properly remove rate-limited gossip_store entries
when channels are closed. This caused gossipd to crash on a subsequent
gossip_store_load. Also corrects an overzealous limit of one gossip_store
entry per message (should now allow one broadcastable and one
rate-limited). Addresses issues 5387, 5395.
Changelog-None
This grows the routing state in order to index both okay-to-broadcast
and rate-limited gossip. The gossip_store also logs the rate-limited
gossip if useful. This allows the broadcast of the last non-rate-limited
gossip.
This attempted to make us re-xmit our own node_announcement at restart,
by moving the node_announcement to the end of the gossip store. But,
as nothing is connected, yet, this had no effect!
We will rexmit it anyway, since it's marked PUSH.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
node_announcement has to follow at least one channel_announcement.
When channels close, if this isn't the case, we remove the old
node_announcement and put it at the end of the gossip_store.
But we lose the "send even if they don't want it" bit in the case it's
our own node_announceent, so keep it.
This only happens if you don't change your node configuration at all
since you opened your first channel, but still worth fixing.
We expose the force_node_announce_rexmit() for later use.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
local_chan was mainly around so we could "soft" disable channels (and
really disable them once we used the channel_update in an error
message).
Instead we introduce the idea of a "deferred_update": it's either
deferred indefinitely (a peer goes offline, if we need to send it in
an error we'll apply it immediatly), or simply delayed to avoid
spamming everyone.
The resulting rewrite is much clearer, IMHO.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Increasingly we want to know is it local, and get the direction: it's
more efficient to do both at once.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This involves removing some fields from the now-misnamed routing.h
datastructures, and various internal messages.
One non-obvious change is to our "keepalive" logic which refreshes
channels every 13 days: instead of using the 'enabled' flag on the
last channel broadcast to decide whether to refresh it, we use the
local connected status directly.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This overcomes the internal spam filter on updates, which can be useful
if we're actually trying to send through such a node.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Fixed: Protocol: always accept channel_updates from errors, even they'd otherwise be rejected as spam.
Fixes: #4300
Instead of a boutique message, use a "real" channel_announcement for
private channels (with fake sigs and pubkeys). This makes it far
easier for gossmap to handle local channels.
Backwards compatible update, since we update old stores.
We also fix devtools/dump-gossipstore to know about the tombstone markers.
Since we increment our channel_announce count for local channels now,
the stats in the tests changed too.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This avoids overwriting the ones in git, and generally makes things neater.
We have convenience headers wire/peer_wire.h and wire/onion_wire.h to
avoid most #ifdefs: simply include those.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
There were no channel updates in my log; because sendonion doesn't know the
actual node_ids or channel_ids, we can't tell gossipd what node/channel it was
so it can no longer remove them on PERM errors.
However, we can tell it the error message so it can apply the update.
Fixes: #3877
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This saves us keeping it in memory (so far, no channels have features), but
lets us optimize that case so we don't need to hit the disk for most of the
channels in listchannels.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This will be used when we want to specify these in a route. But for now, they
only alter gossipd, which always sets them to NULL.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This prevents a gratuitous lookup of we get a late channel_announce,
but even better, it suppresses the "bad gossip" messages in case of
a late channel_update, which have plagued Travis (especially since we
got aggressive in pushing our own updates).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
It usually means we're missing something, but there's no way to ask what.
Simply start a broad scid probe.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We assume that the time for gossip propagation is < 10 minutes, so by
going back that far from last gossip we won't miss anything,
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
It's simple: if we wouldn't accept the timestamp we see, don't put
the channel in the stale_scid_map.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Since we have to validate, there can be a delay (and peer might
vanish) between receiving the gossip and actually confirming it, hence
the use of softref.
We will use this information to check that the peers are making progress
as we start asking them for specific information.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We do this by keeping a current and an old map, and moving the current to old
every hour or 10,000 entries.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
I was seeing some accidental pruning under load / Travis, and in
particular we stopped accepting channel_updates because they were 103
seconds old. But making it too long makes the prune test untenable,
so restore a separate flag that this test can use.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The first one means we don't discard channels just because we're not
synced, and the second is implied by the spec: don't accept
channel_announcement if the channel isn't 6 deep. Since LND defers in
such cases, we do too (unless it's newer than the current block, in
which case we simply discard). Otherwise there's a risk that a slow
node might discard valid gossip.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
It's generally clearer to have simple hardcoded numbers with an
#if DEVELOPER around it, than apparent variables which aren't, really.
Interestingly, our pruning test was always kinda broken: we have to pass
two cycles, since l2 will refresh the channel once to avoid pruning.
Do the more obvious thing, and cut the network in half and check that
l1 and l3 time out.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Make update_local_channel use a timer if it's too soon to make another
update.
1. Implement cupdate_different() which compares two updates.
2. make update_local_channel() take a single arg for timer usage.
3. Set timestamp of non-disable update back 5 minutes, so we can
always generate a disable update if we need to.
4. Make update_local_channel() itself do the "unchanged update" suppression.
gossipd: clean up local channel updates.
5. Keep pointer to the current timer so we override any old updates with
a new one, to avoid a race.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Normally we'd put a pointer into struct half_chan for local
information, but it would be NULL on 99.99% of nodes. Instead, keep a
separate hash table.
This immediately subsumes the previous "map of local-disabled
channels", and will be enhanced further.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We've been slack, but it's going to be important for testing
ratelimiting. And it currently has a minor memory leak.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
