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#ifndef LIGHTNING_COMMON_FEATURES_H
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#define LIGHTNING_COMMON_FEATURES_H
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#include "config.h"
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#include <ccan/short_types/short_types.h>
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#include <ccan/tal/tal.h>
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enum feature_place {
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INIT_FEATURE,
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GLOBAL_INIT_FEATURE,
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NODE_ANNOUNCE_FEATURE,
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CHANNEL_FEATURE,
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BOLT11_FEATURE,
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};
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#define NUM_FEATURE_PLACE (BOLT11_FEATURE+1)
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extern const char *feature_place_names[NUM_FEATURE_PLACE];
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/* The complete set of features for all contexts */
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struct feature_set {
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u8 *bits[NUM_FEATURE_PLACE];
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};
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/* Create feature set for a known feature. */
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struct feature_set *feature_set_for_feature(const tal_t *ctx, int feature);
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/* Marshalling a feature set */
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struct feature_set *fromwire_feature_set(const tal_t *ctx,
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const u8 **ptr, size_t *max);
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void towire_feature_set(u8 **pptr, const struct feature_set *fset);
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/* a |= b, or returns false if features already in a */
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bool feature_set_or(struct feature_set *a,
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const struct feature_set *b TAKES);
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/* Returns -1 if we're OK with all these offered features, otherwise first
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* unsupported (even) feature. */
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int features_unsupported(const struct feature_set *our_features,
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const u8 *their_features,
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enum feature_place p);
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/* For the features in channel_announcement */
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u8 *get_agreed_channelfeatures(const tal_t *ctx,
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const struct feature_set *our_features,
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const u8 *theirfeatures);
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/* Is this feature bit requested? (Either compulsory or optional) */
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bool feature_offered(const u8 *features, size_t f);
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/* Was this feature bit offered by them and us? */
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bool feature_negotiated(const struct feature_set *our_features,
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const u8 *their_features, size_t f);
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/* Features can depend on other features: both must be set!
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* Sets @depender, @missing_dependency if returns false.
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*/
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bool feature_check_depends(const u8 *their_features,
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size_t *depender, size_t *missing_dependency);
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/* Return a list of what (init) features we advertize. */
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const char **list_supported_features(const tal_t *ctx,
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const struct feature_set *fset);
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/* Low-level helpers to deal with big-endian bitfields. */
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bool feature_is_set(const u8 *features, size_t bit);
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void set_feature_bit(u8 **ptr, u32 bit);
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/* Given two featurebit vectors, combine them by applying a logical OR. */
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u8 *featurebits_or(const tal_t *ctx, const u8 *f1 TAKES, const u8 *f2 TAKES);
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/* BOLT #9:
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*
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* Flags are numbered from the least-significant bit, at bit 0 (i.e. 0x1,
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* an _even_ bit). They are generally assigned in pairs so that features
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* can be introduced as optional (_odd_ bits) and later upgraded to be compulsory
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* (_even_ bits), which will be refused by outdated nodes:
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* see [BOLT #1: The `init` Message](01-messaging.md#the-init-message).
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*/
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#define COMPULSORY_FEATURE(x) ((x) & 0xFFFFFFFE)
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#define OPTIONAL_FEATURE(x) ((x) | 1)
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/* BOLT #9:
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*
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* | Bits | Name |...
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* | 0/1 | `option_data_loss_protect` |...
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* | 3 | `initial_routing_sync` |...
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* | 4/5 | `option_upfront_shutdown_script` |...
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* | 6/7 | `gossip_queries` |...
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* | 8/9 | `var_onion_optin` |...
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* | 10/11 | `gossip_queries_ex` |...
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* | 12/13 | `option_static_remotekey` |...
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*/
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#define OPT_DATA_LOSS_PROTECT 0
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#define OPT_INITIAL_ROUTING_SYNC 2
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#define OPT_UPFRONT_SHUTDOWN_SCRIPT 4
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#define OPT_GOSSIP_QUERIES 6
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#define OPT_VAR_ONION 8
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#define OPT_GOSSIP_QUERIES_EX 10
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#define OPT_STATIC_REMOTEKEY 12
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/* BOLT #9:
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*
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* | 14/15 | `payment_secret` |... IN9 ...
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* | 16/17 | `basic_mpp` |... IN9 ...
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* | 18/19 | `option_support_large_channel` |... IN ...
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*/
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#define OPT_PAYMENT_SECRET 14
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#define OPT_BASIC_MPP 16
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#define OPT_LARGE_CHANNELS 18
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/* BOLT-a12da24dd0102c170365124782b46d9710950ac1 #9:
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*
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* | 20/21 | `option_anchor_outputs` |... IN ...
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*/
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#define OPT_ANCHOR_OUTPUTS 20
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/* BOLT-9fc25cfd2895578c0b1ab701ebe6c1eb67a19623 #9:
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*
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* | 102/103 | `option_onion_messages` |... INC+ ...
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*/
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#if EXPERIMENTAL_FEATURES
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#define OPT_ONION_MESSAGES 102
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#endif
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#endif /* LIGHTNING_COMMON_FEATURES_H */
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