#ifndef LIGHTNING_COMMON_FEATURES_H #define LIGHTNING_COMMON_FEATURES_H #include "config.h" #include #include /* Returns true if we're OK with all these offered features. */ bool features_supported(const u8 *globalfeatures, const u8 *localfeatures); /* For sending our features: tal_count() returns length. */ u8 *get_offered_globalfeatures(const tal_t *ctx); u8 *get_offered_localfeatures(const tal_t *ctx); /* Is this feature bit requested? (Either compulsory or optional) */ bool feature_offered(const u8 *features, size_t f); /* Was this feature bit offered by them and us? */ bool local_feature_negotiated(const u8 *lfeatures, size_t f); bool global_feature_negotiated(const u8 *gfeatures, size_t f); /* Return a list of what features we advertize. */ const char **list_supported_features(const tal_t *ctx); /* Low-level helpers to deal with big-endian bitfields. */ bool feature_is_set(const u8 *features, size_t bit); void set_feature_bit(u8 **ptr, u32 bit); /* BOLT-531c8d7d9b01ab610b8a73a0deba1b9e9c83e1ed #9: * * Flags are numbered from the least-significant bit, at bit 0 (i.e. 0x1, * an _even_ bit). They are generally assigned in pairs so that features * can be introduced as optional (_odd_ bits) and later upgraded to be compulsory * (_even_ bits), which will be refused by outdated nodes: * see [BOLT #1: The `init` Message](01-messaging.md#the-init-message). */ #define COMPULSORY_FEATURE(x) ((x) & 0xFFFFFFFE) #define OPTIONAL_FEATURE(x) ((x) | 1) /* BOLT-531c8d7d9b01ab610b8a73a0deba1b9e9c83e1ed #9: * * ## Assigned `localfeatures` flags *... * | Bits | Name |... * | 0/1 | `option_data_loss_protect` |... * | 3 | `initial_routing_sync` |... * | 4/5 | `option_upfront_shutdown_script` |... * | 6/7 | `gossip_queries` |... * | 12/13| `option_static_remotekey` |... */ #define LOCAL_DATA_LOSS_PROTECT 0 #define LOCAL_INITIAL_ROUTING_SYNC 2 #define LOCAL_UPFRONT_SHUTDOWN_SCRIPT 4 #define LOCAL_GOSSIP_QUERIES 6 #define LOCAL_STATIC_REMOTEKEY 12 /* BOLT-927c96daab2338b716708a57cd75c84a2d169e0e #9: * | Bits | Name |... * | 10/11 | `gossip_queries_ex` |... */ #define LOCAL_GOSSIP_QUERIES_EX 10 /* BOLT #9: * * ## Assigned `globalfeatures` flags *... * | Bits | Name | ... * | 8/9 | `var_onion_optin` | ... */ #define GLOBAL_VAR_ONION 8 #endif /* LIGHTNING_COMMON_FEATURES_H */