762 lines
17 KiB
C
762 lines
17 KiB
C
/*
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* Copyright (C) 2008-2019 Tobias Brunner
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* Copyright (C) 2016 Andreas Steffen
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* Copyright (C) 2005-2007 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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* HSR Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "child_cfg.h"
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#include <stdint.h>
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#include <daemon.h>
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ENUM(action_names, ACTION_NONE, ACTION_RESTART,
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"clear",
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"hold",
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"restart",
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);
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/** Default replay window size, if not set using charon.replay_window */
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#define DEFAULT_REPLAY_WINDOW 32
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typedef struct private_child_cfg_t private_child_cfg_t;
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/**
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* Private data of an child_cfg_t object
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*/
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struct private_child_cfg_t {
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/**
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* Public part
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*/
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child_cfg_t public;
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/**
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* Number of references hold by others to this child_cfg
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*/
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refcount_t refcount;
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/**
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* Name of the child_cfg, used to query it
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*/
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char *name;
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/**
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* Options
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*/
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child_cfg_option_t options;
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/**
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* list for all proposals
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*/
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linked_list_t *proposals;
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/**
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* list for traffic selectors for my site
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*/
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linked_list_t *my_ts;
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/**
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* list for traffic selectors for others site
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*/
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linked_list_t *other_ts;
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/**
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* updown script
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*/
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char *updown;
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/**
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* Mode to propose for a initiated CHILD: tunnel/transport
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*/
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ipsec_mode_t mode;
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/**
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* action to take to start CHILD_SA
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*/
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action_t start_action;
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/**
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* action to take on DPD
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*/
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action_t dpd_action;
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/**
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* action to take on CHILD_SA close
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*/
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action_t close_action;
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/**
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* CHILD_SA lifetime config
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*/
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lifetime_cfg_t lifetime;
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/**
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* Inactivity timeout
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*/
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uint32_t inactivity;
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/**
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* Reqid to install CHILD_SA with
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*/
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uint32_t reqid;
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/**
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* Optionl interface ID to use for inbound CHILD_SA
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*/
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uint32_t if_id_in;
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/**
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* Optionl interface ID to use for outbound CHILD_SA
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*/
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uint32_t if_id_out;
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/**
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* Optional mark to install inbound CHILD_SA with
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*/
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mark_t mark_in;
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/**
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* Optional mark to install outbound CHILD_SA with
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*/
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mark_t mark_out;
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/**
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* Optional mark to set to packets after inbound processing
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*/
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mark_t set_mark_in;
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/**
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* Optional mark to set to packets after outbound processing
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*/
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mark_t set_mark_out;
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/**
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* Traffic Flow Confidentiality padding, if enabled
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*/
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uint32_t tfc;
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/**
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* Optional manually-set IPsec policy priorities
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*/
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uint32_t manual_prio;
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/**
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* Optional restriction of IPsec policy to a given network interface
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*/
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char *interface;
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/**
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* anti-replay window size
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*/
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uint32_t replay_window;
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/**
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* HW offload mode
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*/
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hw_offload_t hw_offload;
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/**
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* DS header field copy mode
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*/
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dscp_copy_t copy_dscp;
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};
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METHOD(child_cfg_t, get_name, char*,
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private_child_cfg_t *this)
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{
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return this->name;
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}
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METHOD(child_cfg_t, has_option, bool,
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private_child_cfg_t *this, child_cfg_option_t option)
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{
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return this->options & option;
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}
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METHOD(child_cfg_t, add_proposal, void,
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private_child_cfg_t *this, proposal_t *proposal)
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{
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if (proposal)
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{
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this->proposals->insert_last(this->proposals, proposal);
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}
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}
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CALLBACK(match_proposal, bool,
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proposal_t *item, va_list args)
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{
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proposal_t *proposal;
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VA_ARGS_VGET(args, proposal);
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return item->equals(item, proposal);
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}
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METHOD(child_cfg_t, get_proposals, linked_list_t*,
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private_child_cfg_t *this, bool strip_dh)
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{
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enumerator_t *enumerator;
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proposal_t *current;
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linked_list_t *proposals = linked_list_create();
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enumerator = this->proposals->create_enumerator(this->proposals);
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while (enumerator->enumerate(enumerator, ¤t))
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{
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current = current->clone(current);
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if (strip_dh)
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{
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current->strip_dh(current, MODP_NONE);
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}
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if (proposals->find_first(proposals, match_proposal, NULL, current))
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{
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current->destroy(current);
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continue;
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}
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proposals->insert_last(proposals, current);
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}
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enumerator->destroy(enumerator);
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DBG2(DBG_CFG, "configured proposals: %#P", proposals);
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return proposals;
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}
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METHOD(child_cfg_t, select_proposal, proposal_t*,
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private_child_cfg_t*this, linked_list_t *proposals, bool strip_dh,
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bool private, bool prefer_self)
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{
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enumerator_t *prefer_enum, *match_enum;
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proposal_t *proposal, *match, *selected = NULL;
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if (prefer_self)
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{
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prefer_enum = this->proposals->create_enumerator(this->proposals);
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match_enum = proposals->create_enumerator(proposals);
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}
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else
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{
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prefer_enum = proposals->create_enumerator(proposals);
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match_enum = this->proposals->create_enumerator(this->proposals);
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}
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while (prefer_enum->enumerate(prefer_enum, &proposal))
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{
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proposal = proposal->clone(proposal);
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if (strip_dh)
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{
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proposal->strip_dh(proposal, MODP_NONE);
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}
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if (prefer_self)
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{
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proposals->reset_enumerator(proposals, match_enum);
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}
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else
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{
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this->proposals->reset_enumerator(this->proposals, match_enum);
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}
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while (match_enum->enumerate(match_enum, &match))
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{
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match = match->clone(match);
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if (strip_dh)
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{
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match->strip_dh(match, MODP_NONE);
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}
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selected = proposal->select(proposal, match, prefer_self, private);
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match->destroy(match);
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if (selected)
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{
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DBG2(DBG_CFG, "received proposals: %#P", proposals);
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DBG2(DBG_CFG, "configured proposals: %#P", this->proposals);
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DBG1(DBG_CFG, "selected proposal: %P", selected);
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break;
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}
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}
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proposal->destroy(proposal);
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if (selected)
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{
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break;
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}
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}
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prefer_enum->destroy(prefer_enum);
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match_enum->destroy(match_enum);
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if (!selected)
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{
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DBG1(DBG_CFG, "received proposals: %#P", proposals);
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DBG1(DBG_CFG, "configured proposals: %#P", this->proposals);
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}
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return selected;
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}
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METHOD(child_cfg_t, add_traffic_selector, void,
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private_child_cfg_t *this, bool local, traffic_selector_t *ts)
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{
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if (local)
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{
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this->my_ts->insert_last(this->my_ts, ts);
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}
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else
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{
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this->other_ts->insert_last(this->other_ts, ts);
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}
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}
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METHOD(child_cfg_t, get_traffic_selectors, linked_list_t*,
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private_child_cfg_t *this, bool local, linked_list_t *supplied,
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linked_list_t *hosts, bool log)
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{
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enumerator_t *e1, *e2;
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traffic_selector_t *ts1, *ts2, *selected;
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linked_list_t *result, *derived;
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host_t *host;
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result = linked_list_create();
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derived = linked_list_create();
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if (local)
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{
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e1 = this->my_ts->create_enumerator(this->my_ts);
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}
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else
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{
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e1 = this->other_ts->create_enumerator(this->other_ts);
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}
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/* in a first step, replace "dynamic" TS with the host list */
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while (e1->enumerate(e1, &ts1))
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{
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if (hosts && hosts->get_count(hosts))
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{ /* set hosts if TS is dynamic or as initiator in transport mode */
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bool dynamic = ts1->is_dynamic(ts1),
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proxy_mode = has_option(this, OPT_PROXY_MODE);
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if (dynamic || (this->mode == MODE_TRANSPORT && !proxy_mode &&
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!supplied))
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{
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e2 = hosts->create_enumerator(hosts);
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while (e2->enumerate(e2, &host))
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{
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ts2 = ts1->clone(ts1);
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if (dynamic || !host->is_anyaddr(host))
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{ /* don't make regular TS larger than they were */
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ts2->set_address(ts2, host);
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}
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derived->insert_last(derived, ts2);
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}
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e2->destroy(e2);
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continue;
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}
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}
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derived->insert_last(derived, ts1->clone(ts1));
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}
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e1->destroy(e1);
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if (log)
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{
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DBG2(DBG_CFG, "%s traffic selectors for %s:",
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supplied ? "selecting" : "proposing", local ? "us" : "other");
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}
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if (!supplied)
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{
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while (derived->remove_first(derived, (void**)&ts1) == SUCCESS)
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{
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if (log)
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{
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DBG2(DBG_CFG, " %R", ts1);
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}
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result->insert_last(result, ts1);
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}
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derived->destroy(derived);
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}
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else
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{
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e1 = derived->create_enumerator(derived);
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e2 = supplied->create_enumerator(supplied);
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/* enumerate all configured/derived selectors */
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while (e1->enumerate(e1, &ts1))
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{
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/* enumerate all supplied traffic selectors */
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while (e2->enumerate(e2, &ts2))
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{
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selected = ts1->get_subset(ts1, ts2);
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if (selected)
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{
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if (log)
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{
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DBG2(DBG_CFG, " config: %R, received: %R => match: %R",
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ts1, ts2, selected);
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}
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result->insert_last(result, selected);
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}
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else if (log)
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{
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DBG2(DBG_CFG, " config: %R, received: %R => no match",
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ts1, ts2);
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}
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}
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supplied->reset_enumerator(supplied, e2);
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}
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e1->destroy(e1);
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e2->destroy(e2);
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/* check if we/peer did any narrowing, raise alert */
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e1 = derived->create_enumerator(derived);
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e2 = result->create_enumerator(result);
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while (e1->enumerate(e1, &ts1))
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{
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if (!e2->enumerate(e2, &ts2) || !ts1->equals(ts1, ts2))
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{
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charon->bus->alert(charon->bus, ALERT_TS_NARROWED,
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local, result, this);
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break;
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}
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}
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e1->destroy(e1);
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e2->destroy(e2);
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derived->destroy_offset(derived, offsetof(traffic_selector_t, destroy));
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}
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/* remove any redundant traffic selectors in the list */
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e1 = result->create_enumerator(result);
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e2 = result->create_enumerator(result);
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while (e1->enumerate(e1, &ts1))
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{
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while (e2->enumerate(e2, &ts2))
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{
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if (ts1 != ts2)
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{
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if (ts2->is_contained_in(ts2, ts1))
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{
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result->remove_at(result, e2);
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ts2->destroy(ts2);
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result->reset_enumerator(result, e1);
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break;
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}
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if (ts1->is_contained_in(ts1, ts2))
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{
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result->remove_at(result, e1);
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ts1->destroy(ts1);
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break;
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}
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}
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}
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result->reset_enumerator(result, e2);
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}
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e1->destroy(e1);
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e2->destroy(e2);
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return result;
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}
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METHOD(child_cfg_t, get_updown, char*,
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private_child_cfg_t *this)
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{
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return this->updown;
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}
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/**
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* Applies jitter to the rekey value. Returns the new rekey value.
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* Note: The distribution of random values is not perfect, but it
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* should get the job done.
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*/
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static uint64_t apply_jitter(uint64_t rekey, uint64_t jitter)
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{
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if (jitter == 0)
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{
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return rekey;
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}
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jitter = (jitter == UINT64_MAX) ? jitter : jitter + 1;
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return rekey - jitter * (random() / (RAND_MAX + 1.0));
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}
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#define APPLY_JITTER(l) l.rekey = apply_jitter(l.rekey, l.jitter)
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METHOD(child_cfg_t, get_lifetime, lifetime_cfg_t*,
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private_child_cfg_t *this, bool jitter)
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{
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lifetime_cfg_t *lft = malloc_thing(lifetime_cfg_t);
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memcpy(lft, &this->lifetime, sizeof(lifetime_cfg_t));
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if (!jitter)
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{
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lft->time.jitter = lft->bytes.jitter = lft->packets.jitter = 0;
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}
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APPLY_JITTER(lft->time);
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APPLY_JITTER(lft->bytes);
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APPLY_JITTER(lft->packets);
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return lft;
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}
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METHOD(child_cfg_t, get_mode, ipsec_mode_t,
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private_child_cfg_t *this)
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{
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return this->mode;
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}
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METHOD(child_cfg_t, get_start_action, action_t,
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private_child_cfg_t *this)
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{
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return this->start_action;
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}
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METHOD(child_cfg_t, get_hw_offload, hw_offload_t,
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private_child_cfg_t *this)
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{
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return this->hw_offload;
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}
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METHOD(child_cfg_t, get_copy_dscp, dscp_copy_t,
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private_child_cfg_t *this)
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{
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return this->copy_dscp;
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}
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METHOD(child_cfg_t, get_dpd_action, action_t,
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private_child_cfg_t *this)
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{
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return this->dpd_action;
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}
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METHOD(child_cfg_t, get_close_action, action_t,
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private_child_cfg_t *this)
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{
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return this->close_action;
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}
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METHOD(child_cfg_t, get_dh_group, diffie_hellman_group_t,
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private_child_cfg_t *this)
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{
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enumerator_t *enumerator;
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proposal_t *proposal;
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uint16_t dh_group = MODP_NONE;
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enumerator = this->proposals->create_enumerator(this->proposals);
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while (enumerator->enumerate(enumerator, &proposal))
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{
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if (proposal->get_algorithm(proposal, DIFFIE_HELLMAN_GROUP, &dh_group, NULL))
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{
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break;
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}
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}
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enumerator->destroy(enumerator);
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return dh_group;
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}
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METHOD(child_cfg_t, get_inactivity, uint32_t,
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private_child_cfg_t *this)
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{
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return this->inactivity;
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}
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METHOD(child_cfg_t, get_reqid, uint32_t,
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private_child_cfg_t *this)
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{
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return this->reqid;
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}
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METHOD(child_cfg_t, get_if_id, uint32_t,
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private_child_cfg_t *this, bool inbound)
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{
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return inbound ? this->if_id_in : this->if_id_out;
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}
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METHOD(child_cfg_t, get_mark, mark_t,
|
|
private_child_cfg_t *this, bool inbound)
|
|
{
|
|
return inbound ? this->mark_in : this->mark_out;
|
|
}
|
|
|
|
METHOD(child_cfg_t, get_set_mark, mark_t,
|
|
private_child_cfg_t *this, bool inbound)
|
|
{
|
|
return inbound ? this->set_mark_in : this->set_mark_out;
|
|
}
|
|
|
|
METHOD(child_cfg_t, get_tfc, uint32_t,
|
|
private_child_cfg_t *this)
|
|
{
|
|
return this->tfc;
|
|
}
|
|
|
|
METHOD(child_cfg_t, get_manual_prio, uint32_t,
|
|
private_child_cfg_t *this)
|
|
{
|
|
return this->manual_prio;
|
|
}
|
|
|
|
METHOD(child_cfg_t, get_interface, char*,
|
|
private_child_cfg_t *this)
|
|
{
|
|
return this->interface;
|
|
}
|
|
|
|
METHOD(child_cfg_t, get_replay_window, uint32_t,
|
|
private_child_cfg_t *this)
|
|
{
|
|
return this->replay_window;
|
|
}
|
|
|
|
METHOD(child_cfg_t, set_replay_window, void,
|
|
private_child_cfg_t *this, uint32_t replay_window)
|
|
{
|
|
this->replay_window = replay_window;
|
|
}
|
|
|
|
#define LT_PART_EQUALS(a, b) ({ a.life == b.life && a.rekey == b.rekey && a.jitter == b.jitter; })
|
|
#define LIFETIME_EQUALS(a, b) ({ LT_PART_EQUALS(a.time, b.time) && LT_PART_EQUALS(a.bytes, b.bytes) && LT_PART_EQUALS(a.packets, b.packets); })
|
|
|
|
METHOD(child_cfg_t, equals, bool,
|
|
private_child_cfg_t *this, child_cfg_t *other_pub)
|
|
{
|
|
private_child_cfg_t *other = (private_child_cfg_t*)other_pub;
|
|
|
|
if (this == other)
|
|
{
|
|
return TRUE;
|
|
}
|
|
if (this->public.equals != other->public.equals)
|
|
{
|
|
return FALSE;
|
|
}
|
|
if (!this->proposals->equals_offset(this->proposals, other->proposals,
|
|
offsetof(proposal_t, equals)))
|
|
{
|
|
return FALSE;
|
|
}
|
|
if (!this->my_ts->equals_offset(this->my_ts, other->my_ts,
|
|
offsetof(traffic_selector_t, equals)))
|
|
{
|
|
return FALSE;
|
|
}
|
|
if (!this->other_ts->equals_offset(this->other_ts, other->other_ts,
|
|
offsetof(traffic_selector_t, equals)))
|
|
{
|
|
return FALSE;
|
|
}
|
|
return this->options == other->options &&
|
|
this->mode == other->mode &&
|
|
this->start_action == other->start_action &&
|
|
this->dpd_action == other->dpd_action &&
|
|
this->close_action == other->close_action &&
|
|
LIFETIME_EQUALS(this->lifetime, other->lifetime) &&
|
|
this->inactivity == other->inactivity &&
|
|
this->reqid == other->reqid &&
|
|
this->if_id_in == other->if_id_in &&
|
|
this->if_id_out == other->if_id_out &&
|
|
this->mark_in.value == other->mark_in.value &&
|
|
this->mark_in.mask == other->mark_in.mask &&
|
|
this->mark_out.value == other->mark_out.value &&
|
|
this->mark_out.mask == other->mark_out.mask &&
|
|
this->set_mark_in.value == other->set_mark_in.value &&
|
|
this->set_mark_in.mask == other->set_mark_in.mask &&
|
|
this->set_mark_out.value == other->set_mark_out.value &&
|
|
this->set_mark_out.mask == other->set_mark_out.mask &&
|
|
this->tfc == other->tfc &&
|
|
this->manual_prio == other->manual_prio &&
|
|
this->replay_window == other->replay_window &&
|
|
this->hw_offload == other->hw_offload &&
|
|
this->copy_dscp == other->copy_dscp &&
|
|
streq(this->updown, other->updown) &&
|
|
streq(this->interface, other->interface);
|
|
}
|
|
|
|
METHOD(child_cfg_t, get_ref, child_cfg_t*,
|
|
private_child_cfg_t *this)
|
|
{
|
|
ref_get(&this->refcount);
|
|
return &this->public;
|
|
}
|
|
|
|
METHOD(child_cfg_t, destroy, void,
|
|
private_child_cfg_t *this)
|
|
{
|
|
if (ref_put(&this->refcount))
|
|
{
|
|
this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
|
|
this->my_ts->destroy_offset(this->my_ts, offsetof(traffic_selector_t, destroy));
|
|
this->other_ts->destroy_offset(this->other_ts, offsetof(traffic_selector_t, destroy));
|
|
free(this->updown);
|
|
free(this->interface);
|
|
free(this->name);
|
|
free(this);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Described in header-file
|
|
*/
|
|
child_cfg_t *child_cfg_create(char *name, child_cfg_create_t *data)
|
|
{
|
|
private_child_cfg_t *this;
|
|
|
|
INIT(this,
|
|
.public = {
|
|
.get_name = _get_name,
|
|
.add_traffic_selector = _add_traffic_selector,
|
|
.get_traffic_selectors = _get_traffic_selectors,
|
|
.add_proposal = _add_proposal,
|
|
.get_proposals = _get_proposals,
|
|
.select_proposal = _select_proposal,
|
|
.get_updown = _get_updown,
|
|
.get_mode = _get_mode,
|
|
.get_start_action = _get_start_action,
|
|
.get_dpd_action = _get_dpd_action,
|
|
.get_close_action = _get_close_action,
|
|
.get_lifetime = _get_lifetime,
|
|
.get_dh_group = _get_dh_group,
|
|
.get_inactivity = _get_inactivity,
|
|
.get_reqid = _get_reqid,
|
|
.get_if_id = _get_if_id,
|
|
.get_mark = _get_mark,
|
|
.get_set_mark = _get_set_mark,
|
|
.get_tfc = _get_tfc,
|
|
.get_manual_prio = _get_manual_prio,
|
|
.get_interface = _get_interface,
|
|
.get_replay_window = _get_replay_window,
|
|
.set_replay_window = _set_replay_window,
|
|
.has_option = _has_option,
|
|
.equals = _equals,
|
|
.get_ref = _get_ref,
|
|
.destroy = _destroy,
|
|
.get_hw_offload = _get_hw_offload,
|
|
.get_copy_dscp = _get_copy_dscp,
|
|
},
|
|
.name = strdup(name),
|
|
.options = data->options,
|
|
.updown = strdupnull(data->updown),
|
|
.reqid = data->reqid,
|
|
.if_id_in = data->if_id_in,
|
|
.if_id_out = data->if_id_out,
|
|
.mode = data->mode,
|
|
.start_action = data->start_action,
|
|
.dpd_action = data->dpd_action,
|
|
.close_action = data->close_action,
|
|
.mark_in = data->mark_in,
|
|
.mark_out = data->mark_out,
|
|
.set_mark_in = data->set_mark_in,
|
|
.set_mark_out = data->set_mark_out,
|
|
.lifetime = data->lifetime,
|
|
.inactivity = data->inactivity,
|
|
.tfc = data->tfc,
|
|
.manual_prio = data->priority,
|
|
.interface = strdupnull(data->interface),
|
|
.refcount = 1,
|
|
.proposals = linked_list_create(),
|
|
.my_ts = linked_list_create(),
|
|
.other_ts = linked_list_create(),
|
|
.replay_window = lib->settings->get_int(lib->settings,
|
|
"%s.replay_window", DEFAULT_REPLAY_WINDOW, lib->ns),
|
|
.hw_offload = data->hw_offload,
|
|
.copy_dscp = data->copy_dscp,
|
|
);
|
|
|
|
return &this->public;
|
|
}
|