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connectd: prefer IPv6 when available

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Changelog-Changed: connectd: prefer IPv6 connections when available.
This commit is contained in:
Michael Schmoock 2022-04-25 13:15:18 +02:00 • committed by Rusty Russell
parent aac22f3cb1
commit 033ac323d1
1 changed files with 39 additions and 16 deletions
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55
connectd/connectd.c
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@ -1738,7 +1738,36 @@ static bool wireaddr_int_equals_wireaddr(const struct wireaddr_internal *addr_a,
return wireaddr_eq(&addr_a->u.wireaddr, addr_b);
}
/*~ Orders the addresses which lightningd gave us. */
/*~ Adds just one address type.
*
* Ignores deprecated and the `addrhint`. */
static void add_gossip_addrs_bytype(struct wireaddr_internal **addrs,
const struct wireaddr *normal_addrs,
const struct wireaddr_internal *addrhint,
const enum wire_addr_type type)
{
for (size_t i = 0; i < tal_count(normal_addrs); i++) {
if (normal_addrs[i].type == ADDR_TYPE_TOR_V2_REMOVED)
continue;
if (wireaddr_int_equals_wireaddr(addrhint, &normal_addrs[i]))
continue;
if (normal_addrs[i].type != type)
continue;
struct wireaddr_internal addr;
addr.itype = ADDR_INTERNAL_WIREADDR;
addr.u.wireaddr = normal_addrs[i];
tal_arr_expand(addrs, addr);
}
}
/*~ Orders the addresses which lightningd gave us.
*
* Ignores deprecated protocols and the `addrhint` that is assumed to be
* already added first. Adds all IPv6 addresses, followed by IPv4 and then TOR.
* This ensures we are modern and use IPv6 when possible, falling back to
* direct (faster) IPv4 and finally (less stable) TOR connections. */
static void add_gossip_addrs(struct wireaddr_internal **addrs,
const struct wireaddr *normal_addrs,
const struct wireaddr_internal *addrhint)
@ -1748,28 +1777,22 @@ static void add_gossip_addrs(struct wireaddr_internal **addrs,
/* This is not supported, ignore. */
if (normal_addrs[i].type == ADDR_TYPE_TOR_V2_REMOVED)
continue;
/* add TOR addresses in a second loop */
/* The hint was already added earlier */
if (wireaddr_int_equals_wireaddr(addrhint, &normal_addrs[i]))
continue;
/* We add IPv4 and TOR in separate loops to prefer IPv6 */
if (normal_addrs[i].type == ADDR_TYPE_IPV4)
continue;
if (normal_addrs[i].type == ADDR_TYPE_TOR_V3)
continue;
if (wireaddr_int_equals_wireaddr(addrhint, &normal_addrs[i]))
continue;
struct wireaddr_internal addr;
addr.itype = ADDR_INTERNAL_WIREADDR;
addr.u.wireaddr = normal_addrs[i];
tal_arr_expand(addrs, addr);
}
/* so connectd prefers direct connections if possible. */
for (size_t i = 0; i < tal_count(normal_addrs); i++) {
if (normal_addrs[i].type != ADDR_TYPE_TOR_V3)
continue;
if (wireaddr_int_equals_wireaddr(addrhint, &normal_addrs[i]))
continue;
struct wireaddr_internal addr;
addr.itype = ADDR_INTERNAL_WIREADDR;
addr.u.wireaddr = normal_addrs[i];
tal_arr_expand(addrs, addr);
}
/* Do the loop for skipped protocols in preferred order. */
add_gossip_addrs_bytype(addrs, normal_addrs, addrhint, ADDR_TYPE_IPV4);
add_gossip_addrs_bytype(addrs, normal_addrs, addrhint, ADDR_TYPE_TOR_V3);
}
/*~ Consumes addrhint if not NULL.