/* * Copyright (C) 2006-2015 Tobias Brunner * Copyright (C) 2006 Daniel Roethlisberger * Copyright (C) 2005-2006 Martin Willi * Copyright (C) 2005 Jan Hutter * Hochschule fuer Technik Rapperswil * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. See . * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. */ /* * Copyright (c) 2012 Nanoteq Pty Ltd * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ /** * @defgroup kernel_interface kernel_interface * @{ @ingroup kernel */ #ifndef KERNEL_INTERFACE_H_ #define KERNEL_INTERFACE_H_ typedef struct kernel_interface_t kernel_interface_t; typedef enum kernel_feature_t kernel_feature_t; #include #include #include #include #include /** * Bitfield of optional features a kernel backend supports. * * This feature-set is for both, kernel_ipsec_t and kernel_net_t. Each * backend returns a subset of these features. */ enum kernel_feature_t { /** IPsec can process ESPv3 (RFC 4303) TFC padded packets */ KERNEL_ESP_V3_TFC = (1<<0), /** Networking requires an "exclude" route for IKE/ESP packets */ KERNEL_REQUIRE_EXCLUDE_ROUTE = (1<<1), /** IPsec implementation requires UDP encapsulation of ESP packets */ KERNEL_REQUIRE_UDP_ENCAPSULATION = (1<<2), /** IPsec backend does not require a policy reinstall on SA updates */ KERNEL_NO_POLICY_UPDATES = (1<<3), }; /** * Constructor function for ipsec kernel interface */ typedef kernel_ipsec_t* (*kernel_ipsec_constructor_t)(void); /** * Constructor function for network kernel interface */ typedef kernel_net_t* (*kernel_net_constructor_t)(void); /** * Manager and wrapper for different kernel interfaces. * * The kernel interface handles the communication with the kernel * for SA and policy management and interface and IP address management. */ struct kernel_interface_t { /** * Get the feature set supported by the net and ipsec kernel backends. * * @return ORed feature-set of backends */ kernel_feature_t (*get_features)(kernel_interface_t *this); /** * Get a SPI from the kernel. * * @param src source address of SA * @param dst destination address of SA * @param protocol protocol for SA (ESP/AH) * @param spi allocated spi * @return SUCCESS if operation completed */ status_t (*get_spi)(kernel_interface_t *this, host_t *src, host_t *dst, uint8_t protocol, uint32_t *spi); /** * Get a Compression Parameter Index (CPI) from the kernel. * * @param src source address of SA * @param dst destination address of SA * @param cpi allocated cpi * @return SUCCESS if operation completed */ status_t (*get_cpi)(kernel_interface_t *this, host_t *src, host_t *dst, uint16_t *cpi); /** * Allocate or confirm a reqid to use for a given SA pair. * * Each returned reqid by a successful call to alloc_reqid() must be * released using release_reqid(). * * The reqid parameter is an in/out parameter. If it points to non-zero, * the reqid is confirmed and registered for use. If it points to zero, * a reqid is allocated for the given selectors, and returned to reqid. * * @param local_ts traffic selectors of local side for SA * @param remote_ts traffic selectors of remote side for SA * @param mark_in inbound mark on SA * @param mark_out outbound mark on SA * @param reqid allocated reqid * @return SUCCESS if reqid allocated */ status_t (*alloc_reqid)(kernel_interface_t *this, linked_list_t *local_ts, linked_list_t *remote_ts, mark_t mark_in, mark_t mark_out, uint32_t *reqid); /** * Release a previously allocated reqid. * * @param reqid reqid to release * @param mark_in inbound mark on SA * @param mark_out outbound mark on SA * @return SUCCESS if reqid released */ status_t (*release_reqid)(kernel_interface_t *this, uint32_t reqid, mark_t mark_in, mark_t mark_out); /** * Add an SA to the SAD. * * This function does install a single SA for a single protocol in one * direction. * * @param src source address for this SA * @param dst destination address for this SA * @param spi SPI allocated by us or remote peer * @param protocol protocol for this SA (ESP/AH) * @param reqid reqid for this SA * @param mark optional mark for this SA * @param tfc Traffic Flow Confidentiality padding for this SA * @param lifetime lifetime_cfg_t for this SA * @param enc_alg Algorithm to use for encryption (ESP only) * @param enc_key key to use for encryption * @param int_alg Algorithm to use for integrity protection * @param int_key key to use for integrity protection * @param mode mode of the SA (tunnel, transport) * @param ipcomp IPComp transform to use * @param cpi CPI for IPComp * @param replay_window anti-replay window size * @param initiator TRUE if initiator of the exchange creating this SA * @param encap enable UDP encapsulation for NAT traversal * @param esn TRUE to use Extended Sequence Numbers * @param inbound TRUE if this is an inbound SA * @param update TRUE if an SPI has already been allocated for SA * @param src_ts list of source traffic selectors * @param dst_ts list of destination traffic selectors * @return SUCCESS if operation completed */ status_t (*add_sa) (kernel_interface_t *this, host_t *src, host_t *dst, uint32_t spi, uint8_t protocol, uint32_t reqid, mark_t mark, uint32_t tfc, lifetime_cfg_t *lifetime, uint16_t enc_alg, chunk_t enc_key, uint16_t int_alg, chunk_t int_key, ipsec_mode_t mode, uint16_t ipcomp, uint16_t cpi, uint32_t replay_window, bool initiator, bool encap, bool esn, bool inbound, bool update, linked_list_t *src_ts, linked_list_t *dst_ts); /** * Update the hosts on an installed SA. * * We cannot directly update the destination address as the kernel * requires the spi, the protocol AND the destination address (and family) * to identify SAs. Therefore if the destination address changed we * create a new SA and delete the old one. * * @param spi SPI of the SA * @param protocol protocol for this SA (ESP/AH) * @param cpi CPI for IPComp, 0 if no IPComp is used * @param src current source address * @param dst current destination address * @param new_src new source address * @param new_dst new destination address * @param encap current use of UDP encapsulation * @param new_encap new use of UDP encapsulation * @param mark optional mark for this SA * @return SUCCESS if operation completed, NOT_SUPPORTED if * the kernel interface can't update the SA */ status_t (*update_sa)(kernel_interface_t *this, uint32_t spi, uint8_t protocol, uint16_t cpi, host_t *src, host_t *dst, host_t *new_src, host_t *new_dst, bool encap, bool new_encap, mark_t mark); /** * Query the number of bytes processed by an SA from the SAD. * * @param src source address for this SA * @param dst destination address for this SA * @param spi SPI allocated by us or remote peer * @param protocol protocol for this SA (ESP/AH) * @param mark optional mark for this SA * @param[out] bytes the number of bytes processed by SA * @param[out] packets number of packets processed by SA * @param[out] time last (monotonic) time of SA use * @return SUCCESS if operation completed */ status_t (*query_sa) (kernel_interface_t *this, host_t *src, host_t *dst, uint32_t spi, uint8_t protocol, mark_t mark, uint64_t *bytes, uint64_t *packets, time_t *time); /** * Delete a previously installed SA from the SAD. * * @param src source address for this SA * @param dst destination address for this SA * @param spi SPI allocated by us or remote peer * @param protocol protocol for this SA (ESP/AH) * @param cpi CPI for IPComp or 0 * @param mark optional mark for this SA * @return SUCCESS if operation completed */ status_t (*del_sa) (kernel_interface_t *this, host_t *src, host_t *dst, uint32_t spi, uint8_t protocol, uint16_t cpi, mark_t mark); /** * Flush all SAs from the SAD. * * @return SUCCESS if operation completed */ status_t (*flush_sas) (kernel_interface_t *this); /** * Add a policy to the SPD. * * @param src source address of SA * @param dst dest address of SA * @param src_ts traffic selector to match traffic source * @param dst_ts traffic selector to match traffic dest * @param direction direction of traffic, POLICY_(IN|OUT|FWD) * @param type type of policy, POLICY_(IPSEC|PASS|DROP) * @param sa details about the SA(s) tied to this policy * @param mark mark for this policy * @param priority priority of this policy * @return SUCCESS if operation completed */ status_t (*add_policy) (kernel_interface_t *this, host_t *src, host_t *dst, traffic_selector_t *src_ts, traffic_selector_t *dst_ts, policy_dir_t direction, policy_type_t type, ipsec_sa_cfg_t *sa, mark_t mark, policy_priority_t priority); /** * Query the use time of a policy. * * The use time of a policy is the time the policy was used * for the last time. * * @param src_ts traffic selector to match traffic source * @param dst_ts traffic selector to match traffic dest * @param direction direction of traffic, POLICY_(IN|OUT|FWD) * @param mark optional mark * @param[out] use_time the (monotonic) time of this SA's last use * @return SUCCESS if operation completed */ status_t (*query_policy) (kernel_interface_t *this, traffic_selector_t *src_ts, traffic_selector_t *dst_ts, policy_dir_t direction, mark_t mark, time_t *use_time); /** * Remove a policy from the SPD. * * @param src source address of SA * @param dst dest address of SA * @param src_ts traffic selector to match traffic source * @param dst_ts traffic selector to match traffic dest * @param direction direction of traffic, POLICY_(IN|OUT|FWD) * @param type type of policy, POLICY_(IPSEC|PASS|DROP) * @param sa details about the SA(s) tied to this policy * @param mark mark for this policy * @param priority priority of the policy * @return SUCCESS if operation completed */ status_t (*del_policy) (kernel_interface_t *this, host_t *src, host_t *dst, traffic_selector_t *src_ts, traffic_selector_t *dst_ts, policy_dir_t direction, policy_type_t type, ipsec_sa_cfg_t *sa, mark_t mark, policy_priority_t priority); /** * Flush all policies from the SPD. * * @return SUCCESS if operation completed */ status_t (*flush_policies) (kernel_interface_t *this); /** * Get our outgoing source address for a destination. * * Does a route lookup to get the source address used to reach dest. * The returned host is allocated and must be destroyed. * An optional src address can be used to check if a route is available * for the given source to dest. * * @param dest target destination address * @param src source address to check, or NULL * @return outgoing source address, NULL if unreachable */ host_t* (*get_source_addr)(kernel_interface_t *this, host_t *dest, host_t *src); /** * Get the next hop for a destination. * * Does a route lookup to get the next hop used to reach dest. * The returned host is allocated and must be destroyed. * An optional src address can be used to check if a route is available * for the given source to dest. * * @param dest target destination address * @param prefix prefix length if dest is a subnet, -1 for auto * @param src source address to check, or NULL * @return next hop address, NULL if unreachable */ host_t* (*get_nexthop)(kernel_interface_t *this, host_t *dest, int prefix, host_t *src); /** * Get the interface name of a local address. Interfaces that are down or * ignored by config are not considered. * * @param host address to get interface name from * @param name allocated interface name (optional) * @return TRUE if interface found and usable */ bool (*get_interface)(kernel_interface_t *this, host_t *host, char **name); /** * Creates an enumerator over all local addresses. * * This function blocks an internal cached address list until the * enumerator gets destroyed. * The hosts are read-only, do not modify of free. * * @param which a combination of address types to enumerate * @return enumerator over host_t's */ enumerator_t *(*create_address_enumerator) (kernel_interface_t *this, kernel_address_type_t which); /** * Add a virtual IP to an interface. * * Virtual IPs are attached to an interface. If an IP is added multiple * times, the IP is refcounted and not removed until del_ip() was called * as many times as add_ip(). * * @param virtual_ip virtual ip address to assign * @param prefix prefix length to install IP with, -1 for auto * @param iface interface to install virtual IP on * @return SUCCESS if operation completed */ status_t (*add_ip) (kernel_interface_t *this, host_t *virtual_ip, int prefix, char *iface); /** * Remove a virtual IP from an interface. * * The kernel interface uses refcounting, see add_ip(). * * @param virtual_ip virtual ip address to remove * @param prefix prefix length of the IP to uninstall, -1 for auto * @param wait TRUE to wait untily IP is gone * @return SUCCESS if operation completed */ status_t (*del_ip) (kernel_interface_t *this, host_t *virtual_ip, int prefix, bool wait); /** * Add a route. * * @param dst_net destination net * @param prefixlen destination net prefix length * @param gateway gateway for this route * @param src_ip source ip of the route * @param if_name name of the interface the route is bound to * @return SUCCESS if operation completed * ALREADY_DONE if the route already exists */ status_t (*add_route) (kernel_interface_t *this, chunk_t dst_net, uint8_t prefixlen, host_t *gateway, host_t *src_ip, char *if_name); /** * Delete a route. * * @param dst_net destination net * @param prefixlen destination net prefix length * @param gateway gateway for this route * @param src_ip source ip of the route * @param if_name name of the interface the route is bound to * @return SUCCESS if operation completed */ status_t (*del_route) (kernel_interface_t *this, chunk_t dst_net, uint8_t prefixlen, host_t *gateway, host_t *src_ip, char *if_name); /** * Set up a bypass policy for a given socket. * * @param fd socket file descriptor to setup policy for * @param family protocol family of the socket * @return TRUE if policy set up successfully */ bool (*bypass_socket)(kernel_interface_t *this, int fd, int family); /** * Enable decapsulation of ESP-in-UDP packets for the given port/socket. * * @param fd socket file descriptor * @param family protocol family of the socket * @param port the UDP port * @return TRUE if UDP decapsulation was enabled successfully */ bool (*enable_udp_decap)(kernel_interface_t *this, int fd, int family, uint16_t port); /** * manager methods */ /** * Verifies that the given interface is usable and not excluded by * configuration. * * @param iface interface name * @return TRUE if usable */ bool (*is_interface_usable)(kernel_interface_t *this, const char *iface); /** * Check if interfaces are excluded by config. * * @return TRUE if no interfaces are exclued by config */ bool (*all_interfaces_usable)(kernel_interface_t *this); /** * Tries to find an IP address of a local interface that is included in the * supplied traffic selector. * * @param ts traffic selector * @param ip returned IP address (has to be destroyed) * @param vip set to TRUE if returned address is a virtual IP * @return SUCCESS if address found */ status_t (*get_address_by_ts)(kernel_interface_t *this, traffic_selector_t *ts, host_t **ip, bool *vip); /** * Register an ipsec kernel interface constructor on the manager. * * @param create constructor to register * @return TRUE if the ipsec kernel interface was registered * successfully, FALSE if an interface was already * registered or the registration failed */ bool (*add_ipsec_interface)(kernel_interface_t *this, kernel_ipsec_constructor_t create); /** * Unregister an ipsec kernel interface constructor. * * @param create constructor to unregister * @return TRUE if the ipsec kernel interface was unregistered * successfully, FALSE otherwise */ bool (*remove_ipsec_interface)(kernel_interface_t *this, kernel_ipsec_constructor_t create); /** * Register a network kernel interface constructor on the manager. * * @param create constructor to register * @return TRUE if the kernel net interface was registered * successfully, FALSE if an interface was already * registered or the registration failed */ bool (*add_net_interface)(kernel_interface_t *this, kernel_net_constructor_t create); /** * Unregister a network kernel interface constructor. * * @param create constructor to unregister * @return TRUE if the kernel net interface was unregistered * successfully, FALSE otherwise */ bool (*remove_net_interface)(kernel_interface_t *this, kernel_net_constructor_t create); /** * Add a listener to the kernel interface. * * @param listener listener to add */ void (*add_listener)(kernel_interface_t *this, kernel_listener_t *listener); /** * Remove a listener from the kernel interface. * * @param listener listener to remove */ void (*remove_listener)(kernel_interface_t *this, kernel_listener_t *listener); /** * Raise an acquire event. * * @param reqid reqid of the policy to acquire * @param src_ts source traffic selector * @param dst_ts destination traffic selector */ void (*acquire)(kernel_interface_t *this, uint32_t reqid, traffic_selector_t *src_ts, traffic_selector_t *dst_ts); /** * Raise an expire event. * * @param protocol protocol of the expired SA * @param spi spi of the expired SA * @param dst destination address of expired SA * @param hard TRUE if it is a hard expire, FALSE otherwise */ void (*expire)(kernel_interface_t *this, uint8_t protocol, uint32_t spi, host_t *dst, bool hard); /** * Raise a mapping event. * * @param protocol protocol of affected SA * @param spi spi of the SA * @param dst original destination address of SA * @param remote new remote host */ void (*mapping)(kernel_interface_t *this, uint8_t protocol, uint32_t spi, host_t *dst, host_t *remote); /** * Raise a migrate event. * * @param reqid reqid of the policy * @param src_ts source traffic selector * @param dst_ts destination traffic selector * @param direction direction of the policy (in|out) * @param local local host address to be used in the IKE_SA * @param remote remote host address to be used in the IKE_SA */ void (*migrate)(kernel_interface_t *this, uint32_t reqid, traffic_selector_t *src_ts, traffic_selector_t *dst_ts, policy_dir_t direction, host_t *local, host_t *remote); /** * Raise a roam event. * * @param address TRUE if address list, FALSE if routing changed */ void (*roam)(kernel_interface_t *this, bool address); /** * Raise a tun event. * * @param tun TUN device * @param created TRUE if created, FALSE if going to be destroyed */ void (*tun)(kernel_interface_t *this, tun_device_t *tun, bool created); /** * Register a new algorithm with the kernel interface. * * @param alg_id the IKE id of the algorithm * @param type the transform type of the algorithm * @param kernel_id the kernel id of the algorithm * @param kernel_name the kernel name of the algorithm */ void (*register_algorithm)(kernel_interface_t *this, uint16_t alg_id, transform_type_t type, uint16_t kernel_id, char *kernel_name); /** * Return the kernel-specific id and/or name for an algorithms depending on * the arguments specified. * * @param alg_id the IKE id of the algorithm * @param type the transform type of the algorithm * @param kernel_id the kernel id of the algorithm (optional) * @param kernel_name the kernel name of the algorithm (optional) * @return TRUE if algorithm was found */ bool (*lookup_algorithm)(kernel_interface_t *this, uint16_t alg_id, transform_type_t type, uint16_t *kernel_id, char **kernel_name); /** * Destroys a kernel_interface_t object. */ void (*destroy) (kernel_interface_t *this); }; /** * Creates an object of type kernel_interface_t. */ kernel_interface_t *kernel_interface_create(void); #endif /** KERNEL_INTERFACE_H_ @}*/