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70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
#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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/* Returns true if we're OK with all these offered features. */
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bool features_supported(const u8 *globalfeatures, const u8 *localfeatures);
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/* For sending our features: tal_count() returns length. */
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u8 *get_offered_globalfeatures(const tal_t *ctx);
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u8 *get_offered_localfeatures(const tal_t *ctx);
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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 local_feature_negotiated(const u8 *lfeatures, size_t f);
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bool global_feature_negotiated(const u8 *gfeatures, size_t f);
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/* Return a list of what features we advertize. */
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const char **list_supported_features(const tal_t *ctx);
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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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/* 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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* ## Assigned `localfeatures` flags
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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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*/
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#define LOCAL_DATA_LOSS_PROTECT 0
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#define LOCAL_INITIAL_ROUTING_SYNC 2
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#define LOCAL_UPFRONT_SHUTDOWN_SCRIPT 4
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#define LOCAL_GOSSIP_QUERIES 6
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/* BOLT-927c96daab2338b716708a57cd75c84a2d169e0e #9:
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* | Bits | Name |...
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* | 10/11 | `gossip_queries_ex` |...
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*/
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#define LOCAL_GOSSIP_QUERIES_EX 10
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/* BOLT #9:
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*
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* ## Assigned `globalfeatures` flags
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*...
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* | Bits | Name | ...
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* | 8/9 | `var_onion_optin` | ...
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*/
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#define GLOBAL_VAR_ONION 8
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#endif /* LIGHTNING_COMMON_FEATURES_H */
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