#ifndef LIGHTNING_COMMON_FEATURES_H #define LIGHTNING_COMMON_FEATURES_H #include "config.h" #include #include enum feature_place { INIT_FEATURE, GLOBAL_INIT_FEATURE, NODE_ANNOUNCE_FEATURE, CHANNEL_FEATURE, BOLT11_FEATURE, BOLT12_OFFER_FEATURE, BOLT12_INVREQ_FEATURE, BOLT12_INVOICE_FEATURE, }; #define NUM_FEATURE_PLACE (BOLT12_INVOICE_FEATURE+1) extern const char *feature_place_names[NUM_FEATURE_PLACE]; /* The complete set of features for all contexts */ struct feature_set { u8 *bits[NUM_FEATURE_PLACE]; }; /* Create feature set for a known feature. */ struct feature_set *feature_set_for_feature(const tal_t *ctx, int feature); /* Marshalling a feature set */ struct feature_set *fromwire_feature_set(const tal_t *ctx, const u8 **ptr, size_t *max); void towire_feature_set(u8 **pptr, const struct feature_set *fset); /* a |= b, or returns false if features already in a */ bool feature_set_or(struct feature_set *a, const struct feature_set *b TAKES); /* a - b, or returns false if features not already in a */ bool feature_set_sub(struct feature_set *a, const struct feature_set *b TAKES); /* Returns -1 if we're OK with all these offered features, otherwise first * unsupported (even) feature. */ int features_unsupported(const struct feature_set *our_features, const u8 *their_features, enum feature_place p); /* For the features in channel_announcement */ u8 *get_agreed_channelfeatures(const tal_t *ctx, const struct feature_set *our_features, const u8 *theirfeatures); /* 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 feature_negotiated(const struct feature_set *our_features, const u8 *their_features, size_t f); /* Features can depend on other features: both must be set! * Sets @depender, @missing_dependency if returns false. */ bool feature_check_depends(const u8 *their_features, size_t *depender, size_t *missing_dependency); /* Return a list of what (init) features we advertize. */ const char **list_supported_features(const tal_t *ctx, const struct feature_set *fset); /* Give a name for this feature */ const char *feature_name(const tal_t *ctx, size_t f); /* 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); /* Given two featurebit vectors, combine them by applying a logical OR. */ u8 *featurebits_or(const tal_t *ctx, const u8 *f1 TAKES, const u8 *f2 TAKES); /* Unset a given bit in a featurebits string */ void featurebits_unset(u8 **ptr, size_t bit); /* Are these two feature bitsets functionally equal (one may have * trailing zeroes)? */ bool featurebits_eq(const u8 *f1, const u8 *f2); /* Good for debugging: returns comma-separated string of bits. */ const char *fmt_featurebits(const tal_t *ctx, const u8 *featurebits); struct feature_set *feature_set_dup(const tal_t *ctx, const struct feature_set *other); /* BOLT #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 #9: * * | Bits | Name |... * | 0/1 | `option_data_loss_protect` |... IN ... * | 3 | `initial_routing_sync` |... I ... * | 4/5 | `option_upfront_shutdown_script` |... IN ... * | 6/7 | `gossip_queries` |... IN ... * | 8/9 | `var_onion_optin` |... IN9 ... * | 10/11 | `gossip_queries_ex` |... IN ... * | 12/13 | `option_static_remotekey` |... IN ... * | 14/15 | `payment_secret` |... IN9 ... * | 16/17 | `basic_mpp` |... IN9 ... * | 18/19 | `option_support_large_channel` |... IN ... * | 20/21 | `option_anchor_outputs` |... IN ... * | 22/23 | `option_anchors_zero_fee_htlc_tx` |... IN ... * | 24/25 | `option_route_blinding` |...IN9 ... * | 26/27 | `option_shutdown_anysegwit` |... IN ... * | 28/29 | `option_dual_fund` |... IN ... * | 38/39 | `option_onion_messages` |... IN ... * | 44/45 | `option_channel_type` |... IN ... * | 46/47 | `option_scid_alias` | ... IN ... * | 48/49 | `option_payment_metadata` |... 9 ... * | 50/51 | `option_zeroconf` | ... IN ... */ #define OPT_DATA_LOSS_PROTECT 0 #define OPT_INITIAL_ROUTING_SYNC 2 #define OPT_UPFRONT_SHUTDOWN_SCRIPT 4 #define OPT_GOSSIP_QUERIES 6 #define OPT_VAR_ONION 8 #define OPT_GOSSIP_QUERIES_EX 10 #define OPT_STATIC_REMOTEKEY 12 #define OPT_PAYMENT_SECRET 14 #define OPT_BASIC_MPP 16 #define OPT_LARGE_CHANNELS 18 #define OPT_ANCHOR_OUTPUTS 20 #define OPT_ANCHORS_ZERO_FEE_HTLC_TX 22 #define OPT_ROUTE_BLINDING 24 #define OPT_SHUTDOWN_ANYSEGWIT 26 #define OPT_DUAL_FUND 28 #define OPT_ONION_MESSAGES 38 #define OPT_CHANNEL_TYPE 44 #define OPT_SCID_ALIAS 46 #define OPT_PAYMENT_METADATA 48 #define OPT_ZEROCONF 50 /* BOLT-splice #9: * | 62/63 | `option_splice` | ... IN ... */ #define OPT_SPLICE 62 #define OPT_EXPERIMENTAL_SPLICE 162 /* BOLT-quiescent #9: * | 34/35 | `option_quiesce` | ... IN ... */ #define OPT_QUIESCE 34 #define OPT_SHUTDOWN_WRONG_FUNDING 104 /* BOLT-peer-storage #9: * * | 40/41 | `want_peer_backup_storage` | Want to use other nodes to store encrypted backup data | IN ... * | 42/43 | `provide_peer_backup_storage` | Can store other nodes' encrypted backup data | IN ... */ #define OPT_WANT_PEER_BACKUP_STORAGE 40 #define OPT_PROVIDE_PEER_BACKUP_STORAGE 42 #endif /* LIGHTNING_COMMON_FEATURES_H */