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circuitbuild: Refactor IPv6 extend node selection
Move this complex check into its own function. Part of 33222.
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@ -1999,6 +1999,26 @@ cpath_build_state_to_crn_flags(const cpath_build_state_t *state)
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return flags;
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}
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/* Return the CRN_INITIATE_IPV6_EXTEND flag, based on <b>state</b> and
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* <b>cur_len</b>.
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*
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* Only called for middle nodes (for now). Must not be called on single-hop
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* circuits. */
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STATIC int
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cpath_build_state_to_crn_ipv6_extend_flag(const cpath_build_state_t *state,
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int cur_len)
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{
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IF_BUG_ONCE(state->desired_path_len < 2)
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return 0;
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/* The last node is the relay doing the self-test. So we want to extend over
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* IPv6 from the second-last node. */
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if (state->is_ipv6_selftest && cur_len == state->desired_path_len - 2)
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return CRN_INITIATE_IPV6_EXTEND;
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else
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return 0;
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}
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/** Decide a suitable length for circ's cpath, and pick an exit
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* router (or use <b>exit</b> if provided). Store these in the
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* cpath.
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@ -2320,10 +2340,7 @@ choose_good_middle_server(uint8_t purpose,
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excluded = build_middle_exclude_list(purpose, state, head, cur_len);
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flags |= cpath_build_state_to_crn_flags(state);
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/* Picking the second-last node. (The last node is the relay doing the
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* self-test.) */
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if (state->is_ipv6_selftest && cur_len == state->desired_path_len - 2)
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flags |= CRN_INITIATE_IPV6_EXTEND;
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flags |= cpath_build_state_to_crn_ipv6_extend_flag(state, cur_len);
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/** If a hidden service circuit wants a specific middle node, pin it. */
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if (middle_node_must_be_vanguard(options, purpose, cur_len)) {
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@ -98,6 +98,9 @@ STATIC int
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onion_pick_cpath_exit(origin_circuit_t *circ, extend_info_t *exit_ei,
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int is_hs_v3_rp_circuit);
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STATIC int cpath_build_state_to_crn_flags(const cpath_build_state_t *state);
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STATIC int cpath_build_state_to_crn_ipv6_extend_flag(
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const cpath_build_state_t *state,
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int cur_len);
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#endif /* defined(CIRCUITBUILD_PRIVATE) */
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