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gossip: Use bit 3 (mask 0x08) to signal initial routing sync

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After quite some back and forth we seem to finally agree on the bit
3 (mask 0x08) to signal optional initial_routing_sync.

Signed-off-by: Christian Decker <decker.christian@gmail.com>
This commit is contained in:
Christian Decker
2017-08-08 14:18:30 +02:00
committed by Rusty Russell
parent fbe3a017a9
commit 28cc92cd15
3 changed files with 19 additions and 3 deletions
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5
lightningd/handshake/handshake.c
View File

@@ -970,7 +970,10 @@ static void exchange_init(int fd, struct crypto_state *cs,
* #9](09-features.md), and MUST set to zero any feature bits that are * #9](09-features.md), and MUST set to zero any feature bits that are
* not defined. * not defined.
*/ */
u8 *msg = towire_init(NULL, NULL, NULL); u8 *localfeatures = tal_arrz(NULL, u8, 1);
localfeatures[0] = LOCALFEATURES_INITIAL_ROUTING_SYNC;
u8 *msg = towire_init(NULL, NULL, localfeatures);
localfeatures = tal_free(localfeatures);
if (!sync_crypto_write(cs, fd, msg)) if (!sync_crypto_write(cs, fd, msg))
status_failed(WIRE_INITMSG_WRITE_FAILED, "%s", strerror(errno)); status_failed(WIRE_INITMSG_WRITE_FAILED, "%s", strerror(errno));

2
lightningd/new_connection.c
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@@ -17,7 +17,7 @@
#include <unistd.h> #include <unistd.h>
#include <wire/wire_sync.h> #include <wire/wire_sync.h>
const u8 supported_local_features[] = {0x03}; const u8 supported_local_features[] = {LOCALFEATURES_INITIAL_ROUTING_SYNC};
const u8 supported_global_features[] = {0x00}; const u8 supported_global_features[] = {0x00};
/* Before we have identified the peer, we just have a connection object. */ /* Before we have identified the peer, we just have a connection object. */

15
wire/peer_wire.h
View File

@@ -26,7 +26,20 @@ bool is_gossip_msg(const u8 *cursor);
* of the funding flow wishes to advertise this channel publicly to * of the funding flow wishes to advertise this channel publicly to
* the network as detailed within [BOLT #7] * the network as detailed within [BOLT #7]
*/ */
#define CHANNEL_FLAGS_ANNOUNCE_CHANNEL 1 #define CHANNEL_FLAGS_ANNOUNCE_CHANNEL 1
/* BOLT #7:
*
* Upon establishing a connection, the two endpoints negotiate whether
* to perform an initial sync by setting the `initial_routing_sync`
* flags in the `init` message. The endpoint SHOULD set the
* `initial_routing_sync` flag if it requires a full copy of the other
* endpoint's routing state. Upon receiving an init message with the
* `initial_routing_sync` flag set the node sends `channel_announcement`s,
* `channel_update`s and `node_announcement`s for all known channels and
* nodes as if they were just received.
*/
#define LOCALFEATURES_INITIAL_ROUTING_SYNC 0x08
/* Compare two short_channel_ids and return true if they are the equal */ /* Compare two short_channel_ids and return true if they are the equal */
bool short_channel_id_eq(const struct short_channel_id *a, bool short_channel_id_eq(const struct short_channel_id *a,