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common/features: clean up feature handling for different cases.

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The spec is (RSN!) going to explicitly denote where each feature should
be presented, so create that infrastructure.

Incorporate the new proposed bolt11 features, which need this.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2019-11-23 10:49:23 +10:30
parent 9765642bf8
commit 3b37c9d426
5 changed files with 122 additions and 33 deletions
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112
common/features.c
View File

@ -15,6 +15,72 @@ static const u32 our_features[] = {
OPTIONAL_FEATURE(OPT_STATIC_REMOTEKEY),
};
enum feature_copy_style {
/* Feature is not exposed (importantly, being 0, this is the default!). */
FEATURE_DONT_REPRESENT,
/* Feature is exposed. */
FEATURE_REPRESENT,
/* Feature is exposed, but always optional. */
FEATURE_REPRESENT_AS_OPTIONAL,
};
enum feature_place {
INIT_FEATURE,
GLOBAL_INIT_FEATURE,
NODE_ANNOUNCE_FEATURE,
BOLT11_FEATURE,
};
#define NUM_FEATURE_PLACE (BOLT11_FEATURE+1)
struct feature_style {
u32 bit;
enum feature_copy_style copy_style[NUM_FEATURE_PLACE];
};
static const struct feature_style feature_styles[] = {
{ OPT_DATA_LOSS_PROTECT,
.copy_style = { [INIT_FEATURE] = FEATURE_REPRESENT,
[NODE_ANNOUNCE_FEATURE] = FEATURE_REPRESENT } },
{ OPT_INITIAL_ROUTING_SYNC,
.copy_style = { [INIT_FEATURE] = FEATURE_REPRESENT_AS_OPTIONAL,
[NODE_ANNOUNCE_FEATURE] = FEATURE_DONT_REPRESENT } },
{ OPT_UPFRONT_SHUTDOWN_SCRIPT,
.copy_style = { [INIT_FEATURE] = FEATURE_REPRESENT,
[NODE_ANNOUNCE_FEATURE] = FEATURE_REPRESENT } },
{ OPT_GOSSIP_QUERIES,
.copy_style = { [INIT_FEATURE] = FEATURE_REPRESENT,
[NODE_ANNOUNCE_FEATURE] = FEATURE_REPRESENT } },
{ OPT_GOSSIP_QUERIES_EX,
.copy_style = { [INIT_FEATURE] = FEATURE_REPRESENT,
[NODE_ANNOUNCE_FEATURE] = FEATURE_REPRESENT } },
{ OPT_VAR_ONION,
.copy_style = { [INIT_FEATURE] = FEATURE_REPRESENT,
[GLOBAL_INIT_FEATURE] = FEATURE_REPRESENT,
[NODE_ANNOUNCE_FEATURE] = FEATURE_REPRESENT,
[BOLT11_FEATURE] = FEATURE_REPRESENT } },
{ OPT_STATIC_REMOTEKEY,
.copy_style = { [INIT_FEATURE] = FEATURE_REPRESENT,
[GLOBAL_INIT_FEATURE] = FEATURE_REPRESENT,
[NODE_ANNOUNCE_FEATURE] = FEATURE_REPRESENT } },
{ OPT_PAYMENT_SECRET,
.copy_style = { [INIT_FEATURE] = FEATURE_REPRESENT,
[NODE_ANNOUNCE_FEATURE] = FEATURE_REPRESENT,
[BOLT11_FEATURE] = FEATURE_REPRESENT } },
{ OPT_BASIC_MPP,
.copy_style = { [INIT_FEATURE] = FEATURE_REPRESENT,
[NODE_ANNOUNCE_FEATURE] = FEATURE_REPRESENT,
[BOLT11_FEATURE] = FEATURE_REPRESENT } },
};
static enum feature_copy_style feature_copy_style(u32 f, enum feature_place p)
{
for (size_t i = 0; i < ARRAY_SIZE(feature_styles); i++) {
if (feature_styles[i].bit == COMPULSORY_FEATURE(f))
return feature_styles[i].copy_style[p];
}
abort();
}
/* BOLT #1:
*
* All data fields are unsigned big-endian unless otherwise specified.
@ -39,31 +105,44 @@ static bool test_bit(const u8 *features, size_t byte, unsigned int bit)
return features[tal_count(features) - 1 - byte] & (1 << (bit % 8));
}
static u8 *mkfeatures(const tal_t *ctx, const u32 *arr, size_t n)
static u8 *mkfeatures(const tal_t *ctx, enum feature_place place)
{
u8 *f = tal_arr(ctx, u8, 0);
for (size_t i = 0; i < n; i++)
set_feature_bit(&f, arr[i]);
for (size_t i = 0; i < ARRAY_SIZE(our_features); i++) {
switch (feature_copy_style(our_features[i], place)) {
case FEATURE_DONT_REPRESENT:
continue;
case FEATURE_REPRESENT:
set_feature_bit(&f, our_features[i]);
continue;
case FEATURE_REPRESENT_AS_OPTIONAL:
set_feature_bit(&f, OPTIONAL_FEATURE(our_features[i]));
continue;
}
abort();
}
return f;
}
/* We currently advertize everything in node_announcement, except
* initial_routing_sync which the spec says not to (and we don't set
* any more anyway).
*
* FIXME: Add bolt ref when finalized!
*/
u8 *get_offered_nodefeatures(const tal_t *ctx)
{
return mkfeatures(ctx,
our_features, ARRAY_SIZE(our_features));
return mkfeatures(ctx, NODE_ANNOUNCE_FEATURE);
}
u8 *get_offered_features(const tal_t *ctx)
u8 *get_offered_initfeatures(const tal_t *ctx)
{
return mkfeatures(ctx,
our_features, ARRAY_SIZE(our_features));
return mkfeatures(ctx, INIT_FEATURE);
}
u8 *get_offered_globalinitfeatures(const tal_t *ctx)
{
return mkfeatures(ctx, GLOBAL_INIT_FEATURE);
}
u8 *get_offered_bolt11features(const tal_t *ctx)
{
return mkfeatures(ctx, BOLT11_FEATURE);
}
bool feature_is_set(const u8 *features, size_t bit)
@ -155,7 +234,10 @@ static const char *feature_name(const tal_t *ctx, size_t f)
"option_gossip_queries",
"option_var_onion_optin",
"option_gossip_queries_ex",
"option_static_remotekey" };
"option_static_remotekey",
"option_payment_secret",
"option_basic_mpp",
};
assert(f / 2 < ARRAY_SIZE(fnames));
return tal_fmt(ctx, "%s/%s",

12
common/features.h
View File

@ -9,8 +9,10 @@
int features_unsupported(const u8 *features);
/* For sending our features: tal_count() returns length. */
u8 *get_offered_features(const tal_t *ctx);
u8 *get_offered_initfeatures(const tal_t *ctx);
u8 *get_offered_globalinitfeatures(const tal_t *ctx);
u8 *get_offered_nodefeatures(const tal_t *ctx);
u8 *get_offered_bolt11features(const tal_t *ctx);
/* Is this feature bit requested? (Either compulsory or optional) */
bool feature_offered(const u8 *features, size_t f);
@ -55,6 +57,14 @@ void set_feature_bit(u8 **ptr, u32 bit);
#define OPT_GOSSIP_QUERIES_EX 10
#define OPT_STATIC_REMOTEKEY 12
/* BOLT-3a09bc54f8443c4757b47541a5310aff6377ee21 #9:
*
* | 14/15 | `payment_secret` |... IN9 ...
* | 16/17 | `basic_mpp` |... IN9 ...
*/
#define OPT_PAYMENT_SECRET 14
#define OPT_BASIC_MPP 16
/* BOLT #9:
*
* ## Assigned `globalfeatures` flags

2
common/test/run-features.c
View File

@ -87,7 +87,7 @@ int main(void)
assert(features_unsupported(bits) == -1);
/* We must support our own features. */
lf = get_offered_features(tmpctx);
lf = get_offered_initfeatures(tmpctx);
assert(features_unsupported(lf) == -1);
/* We can add random odd features, no problem. */

24
connectd/peer_exchange_initmsg.c
View File

@ -35,6 +35,7 @@ static struct io_plan *peer_init_received(struct io_conn *conn,
{
u8 *msg = cryptomsg_decrypt_body(tmpctx, &peer->cs, peer->msg);
u8 *globalfeatures, *features;
int unsup;
if (!msg)
return io_close(conn);
@ -73,12 +74,10 @@ static struct io_plan *peer_init_received(struct io_conn *conn,
* - upon receiving unknown _even_ feature bits that are non-zero:
* - MUST fail the connection.
*/
if (features_unsupported(features) != -1) {
const u8 *our_features = get_offered_features(msg);
msg = towire_errorfmt(NULL, NULL, "Unsupported features %s:"
" we only offer features %s",
tal_hex(msg, features),
tal_hex(msg, our_features));
unsup = features_unsupported(features);
if (unsup != -1) {
msg = towire_errorfmt(NULL, NULL, "Unsupported feature %u",
unsup);
msg = cryptomsg_encrypt_msg(NULL, &peer->cs, take(msg));
return io_write(conn, msg, tal_count(msg), io_close_cb, NULL);
}
@ -157,17 +156,18 @@ struct io_plan *peer_exchange_initmsg(struct io_conn *conn,
* But we didn't have any globals for a long time, and it turned out
* that people wanted us to broadcast local features so they could do
* peer selection. We agreed that the number spaces should be distinct,
* but debate still rages on how to handle them.
* but debate still raged on how to handle them.
*
* Meanwhile, we finally added a global bit to the spec, so now it
* matters. And LND v0.8 decided to make option_static_remotekey a
* GLOBAL bit, not a local bit, so we need to send that as a global
* bit here. Thus, we send our full, combo, bitset as both global
* and local bits. */
* bit here.
*
* Finally, we agreed that bits below 13 could be put in both, but
* from now on they'll all go in initfeatures. */
peer->msg = towire_init(NULL,
/* Features so nice, we send it twice! */
get_offered_features(tmpctx),
get_offered_features(tmpctx));
get_offered_globalinitfeatures(tmpctx),
get_offered_initfeatures(tmpctx));
status_peer_io(LOG_IO_OUT, &peer->id, peer->msg);
peer->msg = cryptomsg_encrypt_msg(peer, &peer->cs, take(peer->msg));

5
tests/test_connection.py
View File

@ -1835,10 +1835,7 @@ def test_dataloss_protection(node_factory, bitcoind):
l1.rpc.connect(l2.info['id'], 'localhost', l2.port)
# l1 should send out WIRE_INIT (0010)
l1.daemon.wait_for_log(r"\[OUT\] 0010"
# gflen
+ format(len(lf) // 2, '04x')
+ lf
l1.daemon.wait_for_log(r"\[OUT\] 0010.*"
# lflen
+ format(len(lf) // 2, '04x')
+ lf)