diff options
Diffstat (limited to 'src/core/or/circuit_st.h')
| -rw-r--r-- | src/core/or/circuit_st.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/core/or/circuit_st.h b/src/core/or/circuit_st.h index d4339ff50d..af343f082e 100644 --- a/src/core/or/circuit_st.h +++ b/src/core/or/circuit_st.h @@ -12,6 +12,11 @@ #include "core/or/cell_queue_st.h" struct hs_token_t; +struct circpad_machine_spec_t; +struct circpad_machine_state_t; + +/** Number of padding state machines on a circuit. */ +#define CIRCPAD_MAX_MACHINES (2) /** "magic" value for an origin_circuit_t */ #define ORIGIN_CIRCUIT_MAGIC 0x35315243u @@ -177,6 +182,27 @@ struct circuit_t { /** Hashtable node: used to look up the circuit by its HS token using the HS circuitmap. */ HT_ENTRY(circuit_t) hs_circuitmap_node; + + /** Adaptive Padding state machines: these are immutable. The state machines + * that come from the consensus are saved to a global structure, to avoid + * per-circuit allocations. This merely points to the global copy in + * origin_padding_machines or relay_padding_machines that should never + * change or get deallocated. + * + * Each element of this array corresponds to a different padding machine, + * and we can have up to CIRCPAD_MAX_MACHINES such machines. */ + const struct circpad_machine_spec_t *padding_machine[CIRCPAD_MAX_MACHINES]; + + /** Adaptive Padding machine info for above machines. This is the + * per-circuit mutable information, such as the current state and + * histogram token counts. Some of it is optional (aka NULL). + * If a machine is being shut down, these indexes can be NULL + * without the corresponding padding_machine being NULL, while we + * wait for the other end to respond to our shutdown request. + * + * Each element of this array corresponds to a different padding machine, + * and we can have up to CIRCPAD_MAX_MACHINES such machines. */ + struct circpad_machine_state_t *padding_info[CIRCPAD_MAX_MACHINES]; }; #endif |