2266 lines
57 KiB
C
2266 lines
57 KiB
C
/*
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* Copyright (C) 2006-2009 Tobias Brunner
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* Copyright (C) 2005-2009 Martin Willi
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* Copyright (C) 2008 Andreas Steffen
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* Copyright (C) 2006-2007 Fabian Hartmann, Noah Heusser
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* Copyright (C) 2006 Daniel Roethlisberger
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* Copyright (C) 2005 Jan Hutter
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* 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 <sys/types.h>
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#include <sys/socket.h>
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#include <stdint.h>
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#include <linux/ipsec.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <linux/xfrm.h>
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#include <linux/udp.h>
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#include <unistd.h>
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#include <time.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#include "kernel_netlink_ipsec.h"
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#include "kernel_netlink_shared.h"
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#include <daemon.h>
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#include <threading/thread.h>
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#include <threading/mutex.h>
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#include <utils/hashtable.h>
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#include <processing/jobs/callback_job.h>
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#include <processing/jobs/acquire_job.h>
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#include <processing/jobs/migrate_job.h>
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#include <processing/jobs/rekey_child_sa_job.h>
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#include <processing/jobs/delete_child_sa_job.h>
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#include <processing/jobs/update_sa_job.h>
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/** required for Linux 2.6.26 kernel and later */
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#ifndef XFRM_STATE_AF_UNSPEC
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#define XFRM_STATE_AF_UNSPEC 32
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#endif
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/** from linux/in.h */
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#ifndef IP_XFRM_POLICY
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#define IP_XFRM_POLICY 17
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#endif
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/* missing on uclibc */
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#ifndef IPV6_XFRM_POLICY
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#define IPV6_XFRM_POLICY 34
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#endif /*IPV6_XFRM_POLICY*/
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/** default priority of installed policies */
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#define PRIO_LOW 3000
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#define PRIO_HIGH 2000
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/**
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* map the limit for bytes and packets to XFRM_INF per default
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*/
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#define XFRM_LIMIT(x) ((x) == 0 ? XFRM_INF : (x))
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/**
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* Create ORable bitfield of XFRM NL groups
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*/
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#define XFRMNLGRP(x) (1<<(XFRMNLGRP_##x-1))
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/**
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* returns a pointer to the first rtattr following the nlmsghdr *nlh and the
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* 'usual' netlink data x like 'struct xfrm_usersa_info'
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*/
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#define XFRM_RTA(nlh, x) ((struct rtattr*)(NLMSG_DATA(nlh) + NLMSG_ALIGN(sizeof(x))))
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/**
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* returns a pointer to the next rtattr following rta.
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* !!! do not use this to parse messages. use RTA_NEXT and RTA_OK instead !!!
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*/
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#define XFRM_RTA_NEXT(rta) ((struct rtattr*)(((char*)(rta)) + RTA_ALIGN((rta)->rta_len)))
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/**
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* returns the total size of attached rta data
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* (after 'usual' netlink data x like 'struct xfrm_usersa_info')
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*/
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#define XFRM_PAYLOAD(nlh, x) NLMSG_PAYLOAD(nlh, sizeof(x))
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typedef struct kernel_algorithm_t kernel_algorithm_t;
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/**
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* Mapping of IKEv2 kernel identifier to linux crypto API names
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*/
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struct kernel_algorithm_t {
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/**
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* Identifier specified in IKEv2
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*/
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int ikev2;
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/**
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* Name of the algorithm in linux crypto API
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*/
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char *name;
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};
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ENUM(xfrm_msg_names, XFRM_MSG_NEWSA, XFRM_MSG_MAPPING,
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"XFRM_MSG_NEWSA",
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"XFRM_MSG_DELSA",
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"XFRM_MSG_GETSA",
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"XFRM_MSG_NEWPOLICY",
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"XFRM_MSG_DELPOLICY",
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"XFRM_MSG_GETPOLICY",
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"XFRM_MSG_ALLOCSPI",
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"XFRM_MSG_ACQUIRE",
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"XFRM_MSG_EXPIRE",
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"XFRM_MSG_UPDPOLICY",
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"XFRM_MSG_UPDSA",
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"XFRM_MSG_POLEXPIRE",
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"XFRM_MSG_FLUSHSA",
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"XFRM_MSG_FLUSHPOLICY",
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"XFRM_MSG_NEWAE",
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"XFRM_MSG_GETAE",
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"XFRM_MSG_REPORT",
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"XFRM_MSG_MIGRATE",
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"XFRM_MSG_NEWSADINFO",
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"XFRM_MSG_GETSADINFO",
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"XFRM_MSG_NEWSPDINFO",
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"XFRM_MSG_GETSPDINFO",
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"XFRM_MSG_MAPPING"
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);
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ENUM(xfrm_attr_type_names, XFRMA_UNSPEC, XFRMA_KMADDRESS,
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"XFRMA_UNSPEC",
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"XFRMA_ALG_AUTH",
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"XFRMA_ALG_CRYPT",
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"XFRMA_ALG_COMP",
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"XFRMA_ENCAP",
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"XFRMA_TMPL",
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"XFRMA_SA",
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"XFRMA_POLICY",
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"XFRMA_SEC_CTX",
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"XFRMA_LTIME_VAL",
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"XFRMA_REPLAY_VAL",
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"XFRMA_REPLAY_THRESH",
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"XFRMA_ETIMER_THRESH",
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"XFRMA_SRCADDR",
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"XFRMA_COADDR",
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"XFRMA_LASTUSED",
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"XFRMA_POLICY_TYPE",
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"XFRMA_MIGRATE",
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"XFRMA_ALG_AEAD",
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"XFRMA_KMADDRESS"
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);
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#define END_OF_LIST -1
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/**
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* Algorithms for encryption
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*/
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static kernel_algorithm_t encryption_algs[] = {
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/* {ENCR_DES_IV64, "***" }, */
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{ENCR_DES, "des" },
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{ENCR_3DES, "des3_ede" },
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/* {ENCR_RC5, "***" }, */
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/* {ENCR_IDEA, "***" }, */
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{ENCR_CAST, "cast128" },
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{ENCR_BLOWFISH, "blowfish" },
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/* {ENCR_3IDEA, "***" }, */
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/* {ENCR_DES_IV32, "***" }, */
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{ENCR_NULL, "cipher_null" },
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{ENCR_AES_CBC, "aes" },
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{ENCR_AES_CTR, "rfc3686(ctr(aes))" },
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{ENCR_AES_CCM_ICV8, "rfc4309(ccm(aes))" },
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{ENCR_AES_CCM_ICV12, "rfc4309(ccm(aes))" },
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{ENCR_AES_CCM_ICV16, "rfc4309(ccm(aes))" },
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{ENCR_AES_GCM_ICV8, "rfc4106(gcm(aes))" },
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{ENCR_AES_GCM_ICV12, "rfc4106(gcm(aes))" },
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{ENCR_AES_GCM_ICV16, "rfc4106(gcm(aes))" },
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{ENCR_NULL_AUTH_AES_GMAC, "rfc4543(gcm(aes))" },
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{ENCR_CAMELLIA_CBC, "cbc(camellia)" },
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/* {ENCR_CAMELLIA_CTR, "***" }, */
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/* {ENCR_CAMELLIA_CCM_ICV8, "***" }, */
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/* {ENCR_CAMELLIA_CCM_ICV12, "***" }, */
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/* {ENCR_CAMELLIA_CCM_ICV16, "***" }, */
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{END_OF_LIST, NULL }
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};
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/**
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* Algorithms for integrity protection
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*/
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static kernel_algorithm_t integrity_algs[] = {
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{AUTH_HMAC_MD5_96, "md5" },
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{AUTH_HMAC_SHA1_96, "sha1" },
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{AUTH_HMAC_SHA2_256_96, "sha256" },
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{AUTH_HMAC_SHA2_256_128, "hmac(sha256)" },
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{AUTH_HMAC_SHA2_384_192, "hmac(sha384)" },
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{AUTH_HMAC_SHA2_512_256, "hmac(sha512)" },
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/* {AUTH_DES_MAC, "***" }, */
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/* {AUTH_KPDK_MD5, "***" }, */
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{AUTH_AES_XCBC_96, "xcbc(aes)" },
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{END_OF_LIST, NULL }
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};
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/**
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* Algorithms for IPComp
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*/
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static kernel_algorithm_t compression_algs[] = {
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/* {IPCOMP_OUI, "***" }, */
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{IPCOMP_DEFLATE, "deflate" },
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{IPCOMP_LZS, "lzs" },
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{IPCOMP_LZJH, "lzjh" },
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{END_OF_LIST, NULL }
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};
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/**
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* Look up a kernel algorithm name and its key size
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*/
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static char* lookup_algorithm(kernel_algorithm_t *list, int ikev2)
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{
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while (list->ikev2 != END_OF_LIST)
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{
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if (list->ikev2 == ikev2)
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{
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return list->name;
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}
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list++;
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}
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return NULL;
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}
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typedef struct route_entry_t route_entry_t;
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/**
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* installed routing entry
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*/
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struct route_entry_t {
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/** Name of the interface the route is bound to */
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char *if_name;
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/** Source ip of the route */
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host_t *src_ip;
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/** gateway for this route */
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host_t *gateway;
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/** Destination net */
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chunk_t dst_net;
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/** Destination net prefixlen */
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u_int8_t prefixlen;
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};
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/**
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* destroy an route_entry_t object
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*/
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static void route_entry_destroy(route_entry_t *this)
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{
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free(this->if_name);
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this->src_ip->destroy(this->src_ip);
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DESTROY_IF(this->gateway);
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chunk_free(&this->dst_net);
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free(this);
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}
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typedef struct policy_entry_t policy_entry_t;
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/**
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* installed kernel policy.
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*/
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struct policy_entry_t {
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/** direction of this policy: in, out, forward */
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u_int8_t direction;
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/** parameters of installed policy */
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struct xfrm_selector sel;
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/** optional mark */
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u_int32_t mark;
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/** associated route installed for this policy */
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route_entry_t *route;
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/** by how many CHILD_SA's this policy is used */
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u_int refcount;
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};
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/**
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* Hash function for policy_entry_t objects
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*/
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static u_int policy_hash(policy_entry_t *key)
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{
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chunk_t chunk = chunk_create((void*)&key->sel,
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sizeof(struct xfrm_selector) + sizeof(u_int32_t));
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return chunk_hash(chunk);
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}
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/**
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* Equality function for policy_entry_t objects
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*/
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static bool policy_equals(policy_entry_t *key, policy_entry_t *other_key)
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{
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return memeq(&key->sel, &other_key->sel,
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sizeof(struct xfrm_selector) + sizeof(u_int32_t)) &&
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key->direction == other_key->direction;
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}
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typedef struct private_kernel_netlink_ipsec_t private_kernel_netlink_ipsec_t;
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/**
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* Private variables and functions of kernel_netlink class.
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*/
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struct private_kernel_netlink_ipsec_t {
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/**
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* Public part of the kernel_netlink_t object.
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*/
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kernel_netlink_ipsec_t public;
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/**
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* mutex to lock access to various lists
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*/
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mutex_t *mutex;
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/**
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* Hash table of installed policies (policy_entry_t)
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*/
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hashtable_t *policies;
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/**
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* job receiving netlink events
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*/
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callback_job_t *job;
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/**
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* Netlink xfrm socket (IPsec)
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*/
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netlink_socket_t *socket_xfrm;
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/**
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* netlink xfrm socket to receive acquire and expire events
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*/
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int socket_xfrm_events;
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/**
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* whether to install routes along policies
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*/
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bool install_routes;
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};
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/**
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* convert a IKEv2 specific protocol identifier to the kernel one
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*/
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static u_int8_t proto_ike2kernel(protocol_id_t proto)
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{
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switch (proto)
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{
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case PROTO_ESP:
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return IPPROTO_ESP;
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case PROTO_AH:
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return IPPROTO_AH;
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default:
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return proto;
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}
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}
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/**
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* reverse of ike2kernel
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*/
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static protocol_id_t proto_kernel2ike(u_int8_t proto)
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{
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switch (proto)
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{
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case IPPROTO_ESP:
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return PROTO_ESP;
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case IPPROTO_AH:
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return PROTO_AH;
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default:
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return proto;
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}
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}
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/**
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* convert the general ipsec mode to the one defined in xfrm.h
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*/
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static u_int8_t mode2kernel(ipsec_mode_t mode)
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{
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switch (mode)
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{
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case MODE_TRANSPORT:
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return XFRM_MODE_TRANSPORT;
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case MODE_TUNNEL:
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return XFRM_MODE_TUNNEL;
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case MODE_BEET:
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return XFRM_MODE_BEET;
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default:
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return mode;
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}
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}
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/**
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* convert a host_t to a struct xfrm_address
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*/
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static void host2xfrm(host_t *host, xfrm_address_t *xfrm)
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{
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chunk_t chunk = host->get_address(host);
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memcpy(xfrm, chunk.ptr, min(chunk.len, sizeof(xfrm_address_t)));
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}
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/**
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* convert a struct xfrm_address to a host_t
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*/
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static host_t* xfrm2host(int family, xfrm_address_t *xfrm, u_int16_t port)
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{
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chunk_t chunk;
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switch (family)
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{
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case AF_INET:
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chunk = chunk_create((u_char*)&xfrm->a4, sizeof(xfrm->a4));
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break;
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case AF_INET6:
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chunk = chunk_create((u_char*)&xfrm->a6, sizeof(xfrm->a6));
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break;
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default:
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return NULL;
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}
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return host_create_from_chunk(family, chunk, ntohs(port));
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}
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/**
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* convert a traffic selector address range to subnet and its mask.
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*/
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static void ts2subnet(traffic_selector_t* ts,
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xfrm_address_t *net, u_int8_t *mask)
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{
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host_t *net_host;
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chunk_t net_chunk;
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ts->to_subnet(ts, &net_host, mask);
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net_chunk = net_host->get_address(net_host);
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memcpy(net, net_chunk.ptr, net_chunk.len);
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net_host->destroy(net_host);
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}
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/**
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* convert a traffic selector port range to port/portmask
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*/
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static void ts2ports(traffic_selector_t* ts,
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u_int16_t *port, u_int16_t *mask)
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{
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/* linux does not seem to accept complex portmasks. Only
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* any or a specific port is allowed. We set to any, if we have
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* a port range, or to a specific, if we have one port only.
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*/
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u_int16_t from, to;
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from = ts->get_from_port(ts);
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to = ts->get_to_port(ts);
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if (from == to)
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{
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*port = htons(from);
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*mask = ~0;
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}
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else
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{
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*port = 0;
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*mask = 0;
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}
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}
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/**
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* convert a pair of traffic_selectors to a xfrm_selector
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*/
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static struct xfrm_selector ts2selector(traffic_selector_t *src,
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traffic_selector_t *dst)
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{
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struct xfrm_selector sel;
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memset(&sel, 0, sizeof(sel));
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sel.family = (src->get_type(src) == TS_IPV4_ADDR_RANGE) ? AF_INET : AF_INET6;
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/* src or dest proto may be "any" (0), use more restrictive one */
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sel.proto = max(src->get_protocol(src), dst->get_protocol(dst));
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ts2subnet(dst, &sel.daddr, &sel.prefixlen_d);
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ts2subnet(src, &sel.saddr, &sel.prefixlen_s);
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ts2ports(dst, &sel.dport, &sel.dport_mask);
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ts2ports(src, &sel.sport, &sel.sport_mask);
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sel.ifindex = 0;
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sel.user = 0;
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return sel;
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}
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/**
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* convert a xfrm_selector to a src|dst traffic_selector
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*/
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static traffic_selector_t* selector2ts(struct xfrm_selector *sel, bool src)
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{
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u_char *addr;
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u_int8_t prefixlen;
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u_int16_t port = 0;
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host_t *host = NULL;
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if (src)
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{
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addr = (u_char*)&sel->saddr;
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prefixlen = sel->prefixlen_s;
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if (sel->sport_mask)
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{
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port = htons(sel->sport);
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}
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}
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else
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|
{
|
|
addr = (u_char*)&sel->daddr;
|
|
prefixlen = sel->prefixlen_d;
|
|
if (sel->dport_mask)
|
|
{
|
|
port = htons(sel->dport);
|
|
}
|
|
}
|
|
|
|
/* The Linux 2.6 kernel does not set the selector's family field,
|
|
* so as a kludge we additionally test the prefix length.
|
|
*/
|
|
if (sel->family == AF_INET || sel->prefixlen_s == 32)
|
|
{
|
|
host = host_create_from_chunk(AF_INET, chunk_create(addr, 4), 0);
|
|
}
|
|
else if (sel->family == AF_INET6 || sel->prefixlen_s == 128)
|
|
{
|
|
host = host_create_from_chunk(AF_INET6, chunk_create(addr, 16), 0);
|
|
}
|
|
|
|
if (host)
|
|
{
|
|
return traffic_selector_create_from_subnet(host, prefixlen,
|
|
sel->proto, port);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* process a XFRM_MSG_ACQUIRE from kernel
|
|
*/
|
|
static void process_acquire(private_kernel_netlink_ipsec_t *this, struct nlmsghdr *hdr)
|
|
{
|
|
u_int32_t reqid = 0;
|
|
int proto = 0;
|
|
traffic_selector_t *src_ts, *dst_ts;
|
|
struct xfrm_user_acquire *acquire;
|
|
struct rtattr *rta;
|
|
size_t rtasize;
|
|
job_t *job;
|
|
|
|
acquire = (struct xfrm_user_acquire*)NLMSG_DATA(hdr);
|
|
rta = XFRM_RTA(hdr, struct xfrm_user_acquire);
|
|
rtasize = XFRM_PAYLOAD(hdr, struct xfrm_user_acquire);
|
|
|
|
DBG2(DBG_KNL, "received a XFRM_MSG_ACQUIRE");
|
|
|
|
while (RTA_OK(rta, rtasize))
|
|
{
|
|
DBG2(DBG_KNL, " %N", xfrm_attr_type_names, rta->rta_type);
|
|
|
|
if (rta->rta_type == XFRMA_TMPL)
|
|
{
|
|
struct xfrm_user_tmpl* tmpl;
|
|
|
|
tmpl = (struct xfrm_user_tmpl*)RTA_DATA(rta);
|
|
reqid = tmpl->reqid;
|
|
proto = tmpl->id.proto;
|
|
}
|
|
rta = RTA_NEXT(rta, rtasize);
|
|
}
|
|
switch (proto)
|
|
{
|
|
case 0:
|
|
case IPPROTO_ESP:
|
|
case IPPROTO_AH:
|
|
break;
|
|
default:
|
|
/* acquire for AH/ESP only, not for IPCOMP */
|
|
return;
|
|
}
|
|
src_ts = selector2ts(&acquire->sel, TRUE);
|
|
dst_ts = selector2ts(&acquire->sel, FALSE);
|
|
DBG1(DBG_KNL, "creating acquire job for policy %R === %R with reqid {%u}",
|
|
src_ts, dst_ts, reqid);
|
|
job = (job_t*)acquire_job_create(reqid, src_ts, dst_ts);
|
|
charon->processor->queue_job(charon->processor, job);
|
|
}
|
|
|
|
/**
|
|
* process a XFRM_MSG_EXPIRE from kernel
|
|
*/
|
|
static void process_expire(private_kernel_netlink_ipsec_t *this, struct nlmsghdr *hdr)
|
|
{
|
|
job_t *job;
|
|
protocol_id_t protocol;
|
|
u_int32_t spi, reqid;
|
|
struct xfrm_user_expire *expire;
|
|
|
|
expire = (struct xfrm_user_expire*)NLMSG_DATA(hdr);
|
|
protocol = proto_kernel2ike(expire->state.id.proto);
|
|
spi = expire->state.id.spi;
|
|
reqid = expire->state.reqid;
|
|
|
|
DBG2(DBG_KNL, "received a XFRM_MSG_EXPIRE");
|
|
|
|
if (protocol != PROTO_ESP && protocol != PROTO_AH)
|
|
{
|
|
DBG2(DBG_KNL, "ignoring XFRM_MSG_EXPIRE for SA with SPI %.8x and reqid {%u} "
|
|
"which is not a CHILD_SA", ntohl(spi), reqid);
|
|
return;
|
|
}
|
|
|
|
DBG1(DBG_KNL, "creating %s job for %N CHILD_SA with SPI %.8x and reqid {%d}",
|
|
expire->hard ? "delete" : "rekey", protocol_id_names,
|
|
protocol, ntohl(spi), reqid);
|
|
if (expire->hard)
|
|
{
|
|
job = (job_t*)delete_child_sa_job_create(reqid, protocol, spi);
|
|
}
|
|
else
|
|
{
|
|
job = (job_t*)rekey_child_sa_job_create(reqid, protocol, spi);
|
|
}
|
|
charon->processor->queue_job(charon->processor, job);
|
|
}
|
|
|
|
/**
|
|
* process a XFRM_MSG_MIGRATE from kernel
|
|
*/
|
|
static void process_migrate(private_kernel_netlink_ipsec_t *this, struct nlmsghdr *hdr)
|
|
{
|
|
traffic_selector_t *src_ts, *dst_ts;
|
|
host_t *local = NULL, *remote = NULL;
|
|
host_t *old_src = NULL, *old_dst = NULL;
|
|
host_t *new_src = NULL, *new_dst = NULL;
|
|
struct xfrm_userpolicy_id *policy_id;
|
|
struct rtattr *rta;
|
|
size_t rtasize;
|
|
u_int32_t reqid = 0;
|
|
policy_dir_t dir;
|
|
job_t *job;
|
|
|
|
policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr);
|
|
rta = XFRM_RTA(hdr, struct xfrm_userpolicy_id);
|
|
rtasize = XFRM_PAYLOAD(hdr, struct xfrm_userpolicy_id);
|
|
|
|
DBG2(DBG_KNL, "received a XFRM_MSG_MIGRATE");
|
|
|
|
src_ts = selector2ts(&policy_id->sel, TRUE);
|
|
dst_ts = selector2ts(&policy_id->sel, FALSE);
|
|
dir = (policy_dir_t)policy_id->dir;
|
|
|
|
DBG2(DBG_KNL, " policy: %R === %R %N", src_ts, dst_ts, policy_dir_names);
|
|
|
|
while (RTA_OK(rta, rtasize))
|
|
{
|
|
DBG2(DBG_KNL, " %N", xfrm_attr_type_names, rta->rta_type);
|
|
if (rta->rta_type == XFRMA_KMADDRESS)
|
|
{
|
|
struct xfrm_user_kmaddress *kmaddress;
|
|
|
|
kmaddress = (struct xfrm_user_kmaddress*)RTA_DATA(rta);
|
|
local = xfrm2host(kmaddress->family, &kmaddress->local, 0);
|
|
remote = xfrm2host(kmaddress->family, &kmaddress->remote, 0);
|
|
DBG2(DBG_KNL, " kmaddress: %H...%H", local, remote);
|
|
}
|
|
else if (rta->rta_type == XFRMA_MIGRATE)
|
|
{
|
|
struct xfrm_user_migrate *migrate;
|
|
protocol_id_t proto;
|
|
|
|
migrate = (struct xfrm_user_migrate*)RTA_DATA(rta);
|
|
old_src = xfrm2host(migrate->old_family, &migrate->old_saddr, 0);
|
|
old_dst = xfrm2host(migrate->old_family, &migrate->old_daddr, 0);
|
|
new_src = xfrm2host(migrate->new_family, &migrate->new_saddr, 0);
|
|
new_dst = xfrm2host(migrate->new_family, &migrate->new_daddr, 0);
|
|
proto = proto_kernel2ike(migrate->proto);
|
|
reqid = migrate->reqid;
|
|
DBG2(DBG_KNL, " migrate %N %H...%H to %H...%H, reqid {%u}",
|
|
protocol_id_names, proto, old_src, old_dst,
|
|
new_src, new_dst, reqid);
|
|
DESTROY_IF(old_src);
|
|
DESTROY_IF(old_dst);
|
|
DESTROY_IF(new_src);
|
|
DESTROY_IF(new_dst);
|
|
}
|
|
rta = RTA_NEXT(rta, rtasize);
|
|
}
|
|
|
|
if (src_ts && dst_ts && local && remote)
|
|
{
|
|
DBG1(DBG_KNL, "creating migrate job for policy %R === %R %N with reqid {%u}",
|
|
src_ts, dst_ts, policy_dir_names, dir, reqid, local);
|
|
job = (job_t*)migrate_job_create(reqid, src_ts, dst_ts, dir,
|
|
local, remote);
|
|
charon->processor->queue_job(charon->processor, job);
|
|
}
|
|
else
|
|
{
|
|
DESTROY_IF(src_ts);
|
|
DESTROY_IF(dst_ts);
|
|
DESTROY_IF(local);
|
|
DESTROY_IF(remote);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* process a XFRM_MSG_MAPPING from kernel
|
|
*/
|
|
static void process_mapping(private_kernel_netlink_ipsec_t *this,
|
|
struct nlmsghdr *hdr)
|
|
{
|
|
job_t *job;
|
|
u_int32_t spi, reqid;
|
|
struct xfrm_user_mapping *mapping;
|
|
host_t *host;
|
|
|
|
mapping = (struct xfrm_user_mapping*)NLMSG_DATA(hdr);
|
|
spi = mapping->id.spi;
|
|
reqid = mapping->reqid;
|
|
|
|
DBG2(DBG_KNL, "received a XFRM_MSG_MAPPING");
|
|
|
|
if (proto_kernel2ike(mapping->id.proto) == PROTO_ESP)
|
|
{
|
|
host = xfrm2host(mapping->id.family, &mapping->new_saddr,
|
|
mapping->new_sport);
|
|
if (host)
|
|
{
|
|
DBG1(DBG_KNL, "NAT mappings of ESP CHILD_SA with SPI %.8x and "
|
|
"reqid {%u} changed, queuing update job", ntohl(spi), reqid);
|
|
job = (job_t*)update_sa_job_create(reqid, host);
|
|
charon->processor->queue_job(charon->processor, job);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Receives events from kernel
|
|
*/
|
|
static job_requeue_t receive_events(private_kernel_netlink_ipsec_t *this)
|
|
{
|
|
char response[1024];
|
|
struct nlmsghdr *hdr = (struct nlmsghdr*)response;
|
|
struct sockaddr_nl addr;
|
|
socklen_t addr_len = sizeof(addr);
|
|
int len;
|
|
bool oldstate;
|
|
|
|
oldstate = thread_cancelability(TRUE);
|
|
len = recvfrom(this->socket_xfrm_events, response, sizeof(response), 0,
|
|
(struct sockaddr*)&addr, &addr_len);
|
|
thread_cancelability(oldstate);
|
|
|
|
if (len < 0)
|
|
{
|
|
switch (errno)
|
|
{
|
|
case EINTR:
|
|
/* interrupted, try again */
|
|
return JOB_REQUEUE_DIRECT;
|
|
case EAGAIN:
|
|
/* no data ready, select again */
|
|
return JOB_REQUEUE_DIRECT;
|
|
default:
|
|
DBG1(DBG_KNL, "unable to receive from xfrm event socket");
|
|
sleep(1);
|
|
return JOB_REQUEUE_FAIR;
|
|
}
|
|
}
|
|
|
|
if (addr.nl_pid != 0)
|
|
{ /* not from kernel. not interested, try another one */
|
|
return JOB_REQUEUE_DIRECT;
|
|
}
|
|
|
|
while (NLMSG_OK(hdr, len))
|
|
{
|
|
switch (hdr->nlmsg_type)
|
|
{
|
|
case XFRM_MSG_ACQUIRE:
|
|
process_acquire(this, hdr);
|
|
break;
|
|
case XFRM_MSG_EXPIRE:
|
|
process_expire(this, hdr);
|
|
break;
|
|
case XFRM_MSG_MIGRATE:
|
|
process_migrate(this, hdr);
|
|
break;
|
|
case XFRM_MSG_MAPPING:
|
|
process_mapping(this, hdr);
|
|
break;
|
|
default:
|
|
DBG1(DBG_KNL, "received unknown event from xfrm event socket: %d", hdr->nlmsg_type);
|
|
break;
|
|
}
|
|
hdr = NLMSG_NEXT(hdr, len);
|
|
}
|
|
return JOB_REQUEUE_DIRECT;
|
|
}
|
|
|
|
/**
|
|
* Get an SPI for a specific protocol from the kernel.
|
|
*/
|
|
static status_t get_spi_internal(private_kernel_netlink_ipsec_t *this,
|
|
host_t *src, host_t *dst, u_int8_t proto, u_int32_t min, u_int32_t max,
|
|
u_int32_t reqid, u_int32_t *spi)
|
|
{
|
|
netlink_buf_t request;
|
|
struct nlmsghdr *hdr, *out;
|
|
struct xfrm_userspi_info *userspi;
|
|
u_int32_t received_spi = 0;
|
|
size_t len;
|
|
|
|
memset(&request, 0, sizeof(request));
|
|
|
|
hdr = (struct nlmsghdr*)request;
|
|
hdr->nlmsg_flags = NLM_F_REQUEST;
|
|
hdr->nlmsg_type = XFRM_MSG_ALLOCSPI;
|
|
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userspi_info));
|
|
|
|
userspi = (struct xfrm_userspi_info*)NLMSG_DATA(hdr);
|
|
host2xfrm(src, &userspi->info.saddr);
|
|
host2xfrm(dst, &userspi->info.id.daddr);
|
|
userspi->info.id.proto = proto;
|
|
userspi->info.mode = XFRM_MODE_TUNNEL;
|
|
userspi->info.reqid = reqid;
|
|
userspi->info.family = src->get_family(src);
|
|
userspi->min = min;
|
|
userspi->max = max;
|
|
|
|
if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS)
|
|
{
|
|
hdr = out;
|
|
while (NLMSG_OK(hdr, len))
|
|
{
|
|
switch (hdr->nlmsg_type)
|
|
{
|
|
case XFRM_MSG_NEWSA:
|
|
{
|
|
struct xfrm_usersa_info* usersa = NLMSG_DATA(hdr);
|
|
received_spi = usersa->id.spi;
|
|
break;
|
|
}
|
|
case NLMSG_ERROR:
|
|
{
|
|
struct nlmsgerr *err = NLMSG_DATA(hdr);
|
|
|
|
DBG1(DBG_KNL, "allocating SPI failed: %s (%d)",
|
|
strerror(-err->error), -err->error);
|
|
break;
|
|
}
|
|
default:
|
|
hdr = NLMSG_NEXT(hdr, len);
|
|
continue;
|
|
case NLMSG_DONE:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
free(out);
|
|
}
|
|
|
|
if (received_spi == 0)
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
*spi = received_spi;
|
|
return SUCCESS;
|
|
}
|
|
|
|
METHOD(kernel_ipsec_t, get_spi, status_t,
|
|
private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst,
|
|
protocol_id_t protocol, u_int32_t reqid, u_int32_t *spi)
|
|
{
|
|
DBG2(DBG_KNL, "getting SPI for reqid {%u}", reqid);
|
|
|
|
if (get_spi_internal(this, src, dst, proto_ike2kernel(protocol),
|
|
0xc0000000, 0xcFFFFFFF, reqid, spi) != SUCCESS)
|
|
{
|
|
DBG1(DBG_KNL, "unable to get SPI for reqid {%u}", reqid);
|
|
return FAILED;
|
|
}
|
|
|
|
DBG2(DBG_KNL, "got SPI %.8x for reqid {%u}", ntohl(*spi), reqid);
|
|
|
|
return SUCCESS;
|
|
}
|
|
|
|
METHOD(kernel_ipsec_t, get_cpi, status_t,
|
|
private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst,
|
|
u_int32_t reqid, u_int16_t *cpi)
|
|
{
|
|
u_int32_t received_spi = 0;
|
|
|
|
DBG2(DBG_KNL, "getting CPI for reqid {%u}", reqid);
|
|
|
|
if (get_spi_internal(this, src, dst,
|
|
IPPROTO_COMP, 0x100, 0xEFFF, reqid, &received_spi) != SUCCESS)
|
|
{
|
|
DBG1(DBG_KNL, "unable to get CPI for reqid {%u}", reqid);
|
|
return FAILED;
|
|
}
|
|
|
|
*cpi = htons((u_int16_t)ntohl(received_spi));
|
|
|
|
DBG2(DBG_KNL, "got CPI %.4x for reqid {%u}", ntohs(*cpi), reqid);
|
|
|
|
return SUCCESS;
|
|
}
|
|
|
|
METHOD(kernel_ipsec_t, add_sa, status_t,
|
|
private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst,
|
|
u_int32_t spi, protocol_id_t protocol, u_int32_t reqid, mark_t mark,
|
|
lifetime_cfg_t *lifetime, u_int16_t enc_alg, chunk_t enc_key,
|
|
u_int16_t int_alg, chunk_t int_key, ipsec_mode_t mode, u_int16_t ipcomp,
|
|
u_int16_t cpi, bool encap, bool inbound,
|
|
traffic_selector_t* src_ts, traffic_selector_t* dst_ts)
|
|
{
|
|
netlink_buf_t request;
|
|
char *alg_name;
|
|
struct nlmsghdr *hdr;
|
|
struct xfrm_usersa_info *sa;
|
|
u_int16_t icv_size = 64;
|
|
|
|
/* if IPComp is used, we install an additional IPComp SA. if the cpi is 0
|
|
* we are in the recursive call below */
|
|
if (ipcomp != IPCOMP_NONE && cpi != 0)
|
|
{
|
|
lifetime_cfg_t lft = {{0,0,0},{0,0,0},{0,0,0}};
|
|
add_sa(this, src, dst, htonl(ntohs(cpi)), IPPROTO_COMP, reqid, mark,
|
|
&lft, ENCR_UNDEFINED, chunk_empty, AUTH_UNDEFINED, chunk_empty,
|
|
mode, ipcomp, 0, FALSE, inbound, NULL, NULL);
|
|
ipcomp = IPCOMP_NONE;
|
|
/* use transport mode ESP SA, IPComp uses tunnel mode */
|
|
mode = MODE_TRANSPORT;
|
|
}
|
|
|
|
memset(&request, 0, sizeof(request));
|
|
|
|
if (mark.value)
|
|
{
|
|
DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%u} "
|
|
"(mark %u/0x%8x)", ntohl(spi), reqid, mark.value, mark.mask);
|
|
}
|
|
else
|
|
{
|
|
DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%u}",
|
|
ntohl(spi), reqid);
|
|
}
|
|
hdr = (struct nlmsghdr*)request;
|
|
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
|
|
hdr->nlmsg_type = inbound ? XFRM_MSG_UPDSA : XFRM_MSG_NEWSA;
|
|
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
|
|
|
|
sa = (struct xfrm_usersa_info*)NLMSG_DATA(hdr);
|
|
host2xfrm(src, &sa->saddr);
|
|
host2xfrm(dst, &sa->id.daddr);
|
|
sa->id.spi = spi;
|
|
sa->id.proto = proto_ike2kernel(protocol);
|
|
sa->family = src->get_family(src);
|
|
sa->mode = mode2kernel(mode);
|
|
switch (mode)
|
|
{
|
|
case MODE_TUNNEL:
|
|
sa->flags |= XFRM_STATE_AF_UNSPEC;
|
|
break;
|
|
case MODE_BEET:
|
|
if(src_ts && dst_ts)
|
|
{
|
|
sa->sel = ts2selector(src_ts, dst_ts);
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
sa->replay_window = (protocol == IPPROTO_COMP) ? 0 : 32;
|
|
sa->reqid = reqid;
|
|
sa->lft.soft_byte_limit = XFRM_LIMIT(lifetime->bytes.rekey);
|
|
sa->lft.hard_byte_limit = XFRM_LIMIT(lifetime->bytes.life);
|
|
sa->lft.soft_packet_limit = XFRM_LIMIT(lifetime->packets.rekey);
|
|
sa->lft.hard_packet_limit = XFRM_LIMIT(lifetime->packets.life);
|
|
/* we use lifetimes since added, not since used */
|
|
sa->lft.soft_add_expires_seconds = lifetime->time.rekey;
|
|
sa->lft.hard_add_expires_seconds = lifetime->time.life;
|
|
sa->lft.soft_use_expires_seconds = 0;
|
|
sa->lft.hard_use_expires_seconds = 0;
|
|
|
|
struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_usersa_info);
|
|
|
|
switch (enc_alg)
|
|
{
|
|
case ENCR_UNDEFINED:
|
|
/* no encryption */
|
|
break;
|
|
case ENCR_AES_CCM_ICV16:
|
|
case ENCR_AES_GCM_ICV16:
|
|
case ENCR_NULL_AUTH_AES_GMAC:
|
|
case ENCR_CAMELLIA_CCM_ICV16:
|
|
icv_size += 32;
|
|
/* FALL */
|
|
case ENCR_AES_CCM_ICV12:
|
|
case ENCR_AES_GCM_ICV12:
|
|
case ENCR_CAMELLIA_CCM_ICV12:
|
|
icv_size += 32;
|
|
/* FALL */
|
|
case ENCR_AES_CCM_ICV8:
|
|
case ENCR_AES_GCM_ICV8:
|
|
case ENCR_CAMELLIA_CCM_ICV8:
|
|
{
|
|
struct xfrm_algo_aead *algo;
|
|
|
|
alg_name = lookup_algorithm(encryption_algs, enc_alg);
|
|
if (alg_name == NULL)
|
|
{
|
|
DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
|
|
encryption_algorithm_names, enc_alg);
|
|
return FAILED;
|
|
}
|
|
DBG2(DBG_KNL, " using encryption algorithm %N with key size %d",
|
|
encryption_algorithm_names, enc_alg, enc_key.len * 8);
|
|
|
|
rthdr->rta_type = XFRMA_ALG_AEAD;
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo_aead) + enc_key.len);
|
|
hdr->nlmsg_len += rthdr->rta_len;
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
algo = (struct xfrm_algo_aead*)RTA_DATA(rthdr);
|
|
algo->alg_key_len = enc_key.len * 8;
|
|
algo->alg_icv_len = icv_size;
|
|
strcpy(algo->alg_name, alg_name);
|
|
memcpy(algo->alg_key, enc_key.ptr, enc_key.len);
|
|
|
|
rthdr = XFRM_RTA_NEXT(rthdr);
|
|
break;
|
|
}
|
|
default:
|
|
{
|
|
struct xfrm_algo *algo;
|
|
|
|
alg_name = lookup_algorithm(encryption_algs, enc_alg);
|
|
if (alg_name == NULL)
|
|
{
|
|
DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
|
|
encryption_algorithm_names, enc_alg);
|
|
return FAILED;
|
|
}
|
|
DBG2(DBG_KNL, " using encryption algorithm %N with key size %d",
|
|
encryption_algorithm_names, enc_alg, enc_key.len * 8);
|
|
|
|
rthdr->rta_type = XFRMA_ALG_CRYPT;
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + enc_key.len);
|
|
hdr->nlmsg_len += rthdr->rta_len;
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
algo = (struct xfrm_algo*)RTA_DATA(rthdr);
|
|
algo->alg_key_len = enc_key.len * 8;
|
|
strcpy(algo->alg_name, alg_name);
|
|
memcpy(algo->alg_key, enc_key.ptr, enc_key.len);
|
|
|
|
rthdr = XFRM_RTA_NEXT(rthdr);
|
|
}
|
|
}
|
|
|
|
if (int_alg != AUTH_UNDEFINED)
|
|
{
|
|
alg_name = lookup_algorithm(integrity_algs, int_alg);
|
|
if (alg_name == NULL)
|
|
{
|
|
DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
|
|
integrity_algorithm_names, int_alg);
|
|
return FAILED;
|
|
}
|
|
DBG2(DBG_KNL, " using integrity algorithm %N with key size %d",
|
|
integrity_algorithm_names, int_alg, int_key.len * 8);
|
|
|
|
if (int_alg == AUTH_HMAC_SHA2_256_128)
|
|
{
|
|
struct xfrm_algo_auth* algo;
|
|
|
|
/* the kernel uses SHA256 with 96 bit truncation by default,
|
|
* use specified truncation size supported by newer kernels */
|
|
rthdr->rta_type = XFRMA_ALG_AUTH_TRUNC;
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo_auth) + int_key.len);
|
|
|
|
hdr->nlmsg_len += rthdr->rta_len;
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
algo = (struct xfrm_algo_auth*)RTA_DATA(rthdr);
|
|
algo->alg_key_len = int_key.len * 8;
|
|
algo->alg_trunc_len = 128;
|
|
strcpy(algo->alg_name, alg_name);
|
|
memcpy(algo->alg_key, int_key.ptr, int_key.len);
|
|
}
|
|
else
|
|
{
|
|
struct xfrm_algo* algo;
|
|
|
|
rthdr->rta_type = XFRMA_ALG_AUTH;
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + int_key.len);
|
|
|
|
hdr->nlmsg_len += rthdr->rta_len;
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
algo = (struct xfrm_algo*)RTA_DATA(rthdr);
|
|
algo->alg_key_len = int_key.len * 8;
|
|
strcpy(algo->alg_name, alg_name);
|
|
memcpy(algo->alg_key, int_key.ptr, int_key.len);
|
|
}
|
|
rthdr = XFRM_RTA_NEXT(rthdr);
|
|
}
|
|
|
|
if (ipcomp != IPCOMP_NONE)
|
|
{
|
|
rthdr->rta_type = XFRMA_ALG_COMP;
|
|
alg_name = lookup_algorithm(compression_algs, ipcomp);
|
|
if (alg_name == NULL)
|
|
{
|
|
DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
|
|
ipcomp_transform_names, ipcomp);
|
|
return FAILED;
|
|
}
|
|
DBG2(DBG_KNL, " using compression algorithm %N",
|
|
ipcomp_transform_names, ipcomp);
|
|
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo));
|
|
hdr->nlmsg_len += rthdr->rta_len;
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
struct xfrm_algo* algo = (struct xfrm_algo*)RTA_DATA(rthdr);
|
|
algo->alg_key_len = 0;
|
|
strcpy(algo->alg_name, alg_name);
|
|
|
|
rthdr = XFRM_RTA_NEXT(rthdr);
|
|
}
|
|
|
|
if (encap)
|
|
{
|
|
struct xfrm_encap_tmpl *tmpl;
|
|
|
|
rthdr->rta_type = XFRMA_ENCAP;
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_encap_tmpl));
|
|
|
|
hdr->nlmsg_len += rthdr->rta_len;
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rthdr);
|
|
tmpl->encap_type = UDP_ENCAP_ESPINUDP;
|
|
tmpl->encap_sport = htons(src->get_port(src));
|
|
tmpl->encap_dport = htons(dst->get_port(dst));
|
|
memset(&tmpl->encap_oa, 0, sizeof (xfrm_address_t));
|
|
/* encap_oa could probably be derived from the
|
|
* traffic selectors [rfc4306, p39]. In the netlink kernel implementation
|
|
* pluto does the same as we do here but it uses encap_oa in the
|
|
* pfkey implementation. BUT as /usr/src/linux/net/key/af_key.c indicates
|
|
* the kernel ignores it anyway
|
|
* -> does that mean that NAT-T encap doesn't work in transport mode?
|
|
* No. The reason the kernel ignores NAT-OA is that it recomputes
|
|
* (or, rather, just ignores) the checksum. If packets pass
|
|
* the IPsec checks it marks them "checksum ok" so OA isn't needed. */
|
|
rthdr = XFRM_RTA_NEXT(rthdr);
|
|
}
|
|
|
|
if (mark.value)
|
|
{
|
|
struct xfrm_mark *mrk;
|
|
|
|
rthdr->rta_type = XFRMA_MARK;
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark));
|
|
|
|
hdr->nlmsg_len += rthdr->rta_len;
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
|
|
mrk->v = mark.value;
|
|
mrk->m = mark.mask;
|
|
rthdr = XFRM_RTA_NEXT(rthdr);
|
|
}
|
|
|
|
if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
|
|
{
|
|
if (mark.value)
|
|
{
|
|
DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x "
|
|
"(mark %u/0x%8x)", ntohl(spi), mark.value, mark.mask);
|
|
}
|
|
else
|
|
{
|
|
DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x", ntohl(spi));
|
|
}
|
|
return FAILED;
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* Get the replay state (i.e. sequence numbers) of an SA.
|
|
*/
|
|
static status_t get_replay_state(private_kernel_netlink_ipsec_t *this,
|
|
u_int32_t spi, protocol_id_t protocol, host_t *dst,
|
|
struct xfrm_replay_state *replay)
|
|
{
|
|
netlink_buf_t request;
|
|
struct nlmsghdr *hdr, *out = NULL;
|
|
struct xfrm_aevent_id *out_aevent = NULL, *aevent_id;
|
|
size_t len;
|
|
struct rtattr *rta;
|
|
size_t rtasize;
|
|
|
|
memset(&request, 0, sizeof(request));
|
|
|
|
DBG2(DBG_KNL, "querying replay state from SAD entry with SPI %.8x", ntohl(spi));
|
|
|
|
hdr = (struct nlmsghdr*)request;
|
|
hdr->nlmsg_flags = NLM_F_REQUEST;
|
|
hdr->nlmsg_type = XFRM_MSG_GETAE;
|
|
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
|
|
|
|
aevent_id = (struct xfrm_aevent_id*)NLMSG_DATA(hdr);
|
|
aevent_id->flags = XFRM_AE_RVAL;
|
|
|
|
host2xfrm(dst, &aevent_id->sa_id.daddr);
|
|
aevent_id->sa_id.spi = spi;
|
|
aevent_id->sa_id.proto = proto_ike2kernel(protocol);
|
|
aevent_id->sa_id.family = dst->get_family(dst);
|
|
|
|
if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS)
|
|
{
|
|
hdr = out;
|
|
while (NLMSG_OK(hdr, len))
|
|
{
|
|
switch (hdr->nlmsg_type)
|
|
{
|
|
case XFRM_MSG_NEWAE:
|
|
{
|
|
out_aevent = NLMSG_DATA(hdr);
|
|
break;
|
|
}
|
|
case NLMSG_ERROR:
|
|
{
|
|
struct nlmsgerr *err = NLMSG_DATA(hdr);
|
|
DBG1(DBG_KNL, "querying replay state from SAD entry failed: %s (%d)",
|
|
strerror(-err->error), -err->error);
|
|
break;
|
|
}
|
|
default:
|
|
hdr = NLMSG_NEXT(hdr, len);
|
|
continue;
|
|
case NLMSG_DONE:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (out_aevent == NULL)
|
|
{
|
|
DBG1(DBG_KNL, "unable to query replay state from SAD entry with SPI %.8x",
|
|
ntohl(spi));
|
|
free(out);
|
|
return FAILED;
|
|
}
|
|
|
|
rta = XFRM_RTA(out, struct xfrm_aevent_id);
|
|
rtasize = XFRM_PAYLOAD(out, struct xfrm_aevent_id);
|
|
while(RTA_OK(rta, rtasize))
|
|
{
|
|
if (rta->rta_type == XFRMA_REPLAY_VAL &&
|
|
RTA_PAYLOAD(rta) == sizeof(struct xfrm_replay_state))
|
|
{
|
|
memcpy(replay, RTA_DATA(rta), RTA_PAYLOAD(rta));
|
|
free(out);
|
|
return SUCCESS;
|
|
}
|
|
rta = RTA_NEXT(rta, rtasize);
|
|
}
|
|
|
|
DBG1(DBG_KNL, "unable to query replay state from SAD entry with SPI %.8x",
|
|
ntohl(spi));
|
|
free(out);
|
|
return FAILED;
|
|
}
|
|
|
|
METHOD(kernel_ipsec_t, query_sa, status_t,
|
|
private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst,
|
|
u_int32_t spi, protocol_id_t protocol, mark_t mark, u_int64_t *bytes)
|
|
{
|
|
netlink_buf_t request;
|
|
struct nlmsghdr *out = NULL, *hdr;
|
|
struct xfrm_usersa_id *sa_id;
|
|
struct xfrm_usersa_info *sa = NULL;
|
|
size_t len;
|
|
|
|
memset(&request, 0, sizeof(request));
|
|
|
|
if (mark.value)
|
|
{
|
|
DBG2(DBG_KNL, "querying SAD entry with SPI %.8x (mark %u/0x%8x)",
|
|
ntohl(spi), mark.value, mark.mask);
|
|
}
|
|
else
|
|
{
|
|
DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi));
|
|
}
|
|
hdr = (struct nlmsghdr*)request;
|
|
hdr->nlmsg_flags = NLM_F_REQUEST;
|
|
hdr->nlmsg_type = XFRM_MSG_GETSA;
|
|
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id));
|
|
|
|
sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
|
|
host2xfrm(dst, &sa_id->daddr);
|
|
sa_id->spi = spi;
|
|
sa_id->proto = proto_ike2kernel(protocol);
|
|
sa_id->family = dst->get_family(dst);
|
|
|
|
if (mark.value)
|
|
{
|
|
struct xfrm_mark *mrk;
|
|
struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_usersa_id);
|
|
|
|
rthdr->rta_type = XFRMA_MARK;
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark));
|
|
hdr->nlmsg_len += rthdr->rta_len;
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
|
|
mrk->v = mark.value;
|
|
mrk->m = mark.mask;
|
|
}
|
|
|
|
if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS)
|
|
{
|
|
hdr = out;
|
|
while (NLMSG_OK(hdr, len))
|
|
{
|
|
switch (hdr->nlmsg_type)
|
|
{
|
|
case XFRM_MSG_NEWSA:
|
|
{
|
|
sa = (struct xfrm_usersa_info*)NLMSG_DATA(hdr);
|
|
break;
|
|
}
|
|
case NLMSG_ERROR:
|
|
{
|
|
struct nlmsgerr *err = NLMSG_DATA(hdr);
|
|
|
|
if (mark.value)
|
|
{
|
|
DBG1(DBG_KNL, "querying SAD entry with SPI %.8x "
|
|
"(mark %u/0x%8x) failed: %s (%d)",
|
|
ntohl(spi), mark.value, mark.mask,
|
|
strerror(-err->error), -err->error);
|
|
}
|
|
else
|
|
{
|
|
DBG1(DBG_KNL, "querying SAD entry with SPI %.8x "
|
|
"failed: %s (%d)", ntohl(spi),
|
|
strerror(-err->error), -err->error);
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
hdr = NLMSG_NEXT(hdr, len);
|
|
continue;
|
|
case NLMSG_DONE:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (sa == NULL)
|
|
{
|
|
DBG2(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
|
|
free(out);
|
|
return FAILED;
|
|
}
|
|
*bytes = sa->curlft.bytes;
|
|
|
|
free(out);
|
|
return SUCCESS;
|
|
}
|
|
|
|
METHOD(kernel_ipsec_t, del_sa, status_t,
|
|
private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst,
|
|
u_int32_t spi, protocol_id_t protocol, u_int16_t cpi, mark_t mark)
|
|
{
|
|
netlink_buf_t request;
|
|
struct nlmsghdr *hdr;
|
|
struct xfrm_usersa_id *sa_id;
|
|
|
|
/* if IPComp was used, we first delete the additional IPComp SA */
|
|
if (cpi)
|
|
{
|
|
del_sa(this, src, dst, htonl(ntohs(cpi)), IPPROTO_COMP, 0, mark);
|
|
}
|
|
|
|
memset(&request, 0, sizeof(request));
|
|
|
|
if (mark.value)
|
|
{
|
|
DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x (mark %u/0x%8x)",
|
|
ntohl(spi), mark.value, mark.mask);
|
|
}
|
|
else
|
|
{
|
|
DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x", ntohl(spi));
|
|
}
|
|
hdr = (struct nlmsghdr*)request;
|
|
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
|
|
hdr->nlmsg_type = XFRM_MSG_DELSA;
|
|
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id));
|
|
|
|
sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
|
|
host2xfrm(dst, &sa_id->daddr);
|
|
sa_id->spi = spi;
|
|
sa_id->proto = proto_ike2kernel(protocol);
|
|
sa_id->family = dst->get_family(dst);
|
|
|
|
if (mark.value)
|
|
{
|
|
struct xfrm_mark *mrk;
|
|
struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_usersa_id);
|
|
|
|
rthdr->rta_type = XFRMA_MARK;
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark));
|
|
hdr->nlmsg_len += rthdr->rta_len;
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
|
|
mrk->v = mark.value;
|
|
mrk->m = mark.mask;
|
|
}
|
|
|
|
if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
|
|
{
|
|
if (mark.value)
|
|
{
|
|
DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x "
|
|
"(mark %u/0x%8x)", ntohl(spi), mark.value, mark.mask);
|
|
}
|
|
else
|
|
{
|
|
DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x", ntohl(spi));
|
|
}
|
|
return FAILED;
|
|
}
|
|
if (mark.value)
|
|
{
|
|
DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x (mark %u/0x%8x)",
|
|
ntohl(spi), mark.value, mark.mask);
|
|
}
|
|
else
|
|
{
|
|
DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x", ntohl(spi));
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
METHOD(kernel_ipsec_t, update_sa, status_t,
|
|
private_kernel_netlink_ipsec_t *this, u_int32_t spi, protocol_id_t protocol,
|
|
u_int16_t cpi, host_t *src, host_t *dst, host_t *new_src, host_t *new_dst,
|
|
bool old_encap, bool new_encap, mark_t mark)
|
|
{
|
|
netlink_buf_t request;
|
|
u_char *pos;
|
|
struct nlmsghdr *hdr, *out = NULL;
|
|
struct xfrm_usersa_id *sa_id;
|
|
struct xfrm_usersa_info *out_sa = NULL, *sa;
|
|
size_t len;
|
|
struct rtattr *rta;
|
|
size_t rtasize;
|
|
struct xfrm_encap_tmpl* tmpl = NULL;
|
|
bool got_replay_state = FALSE;
|
|
struct xfrm_replay_state replay;
|
|
|
|
/* if IPComp is used, we first update the IPComp SA */
|
|
if (cpi)
|
|
{
|
|
update_sa(this, htonl(ntohs(cpi)), IPPROTO_COMP, 0,
|
|
src, dst, new_src, new_dst, FALSE, FALSE, mark);
|
|
}
|
|
|
|
memset(&request, 0, sizeof(request));
|
|
|
|
DBG2(DBG_KNL, "querying SAD entry with SPI %.8x for update", ntohl(spi));
|
|
|
|
/* query the existing SA first */
|
|
hdr = (struct nlmsghdr*)request;
|
|
hdr->nlmsg_flags = NLM_F_REQUEST;
|
|
hdr->nlmsg_type = XFRM_MSG_GETSA;
|
|
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id));
|
|
|
|
sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
|
|
host2xfrm(dst, &sa_id->daddr);
|
|
sa_id->spi = spi;
|
|
sa_id->proto = proto_ike2kernel(protocol);
|
|
sa_id->family = dst->get_family(dst);
|
|
|
|
if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS)
|
|
{
|
|
hdr = out;
|
|
while (NLMSG_OK(hdr, len))
|
|
{
|
|
switch (hdr->nlmsg_type)
|
|
{
|
|
case XFRM_MSG_NEWSA:
|
|
{
|
|
out_sa = NLMSG_DATA(hdr);
|
|
break;
|
|
}
|
|
case NLMSG_ERROR:
|
|
{
|
|
struct nlmsgerr *err = NLMSG_DATA(hdr);
|
|
DBG1(DBG_KNL, "querying SAD entry failed: %s (%d)",
|
|
strerror(-err->error), -err->error);
|
|
break;
|
|
}
|
|
default:
|
|
hdr = NLMSG_NEXT(hdr, len);
|
|
continue;
|
|
case NLMSG_DONE:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
if (out_sa == NULL)
|
|
{
|
|
DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi));
|
|
free(out);
|
|
return FAILED;
|
|
}
|
|
|
|
/* try to get the replay state */
|
|
if (get_replay_state(this, spi, protocol, dst, &replay) == SUCCESS)
|
|
{
|
|
got_replay_state = TRUE;
|
|
}
|
|
|
|
/* delete the old SA (without affecting the IPComp SA) */
|
|
if (del_sa(this, src, dst, spi, protocol, 0, mark) != SUCCESS)
|
|
{
|
|
DBG1(DBG_KNL, "unable to delete old SAD entry with SPI %.8x", ntohl(spi));
|
|
free(out);
|
|
return FAILED;
|
|
}
|
|
|
|
DBG2(DBG_KNL, "updating SAD entry with SPI %.8x from %#H..%#H to %#H..%#H",
|
|
ntohl(spi), src, dst, new_src, new_dst);
|
|
/* copy over the SA from out to request */
|
|
hdr = (struct nlmsghdr*)request;
|
|
memcpy(hdr, out, min(out->nlmsg_len, sizeof(request)));
|
|
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
|
|
hdr->nlmsg_type = XFRM_MSG_NEWSA;
|
|
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
|
|
sa = NLMSG_DATA(hdr);
|
|
sa->family = new_dst->get_family(new_dst);
|
|
|
|
if (!src->ip_equals(src, new_src))
|
|
{
|
|
host2xfrm(new_src, &sa->saddr);
|
|
}
|
|
if (!dst->ip_equals(dst, new_dst))
|
|
{
|
|
host2xfrm(new_dst, &sa->id.daddr);
|
|
}
|
|
|
|
rta = XFRM_RTA(out, struct xfrm_usersa_info);
|
|
rtasize = XFRM_PAYLOAD(out, struct xfrm_usersa_info);
|
|
pos = (u_char*)XFRM_RTA(hdr, struct xfrm_usersa_info);
|
|
while(RTA_OK(rta, rtasize))
|
|
{
|
|
/* copy all attributes, but not XFRMA_ENCAP if we are disabling it */
|
|
if (rta->rta_type != XFRMA_ENCAP || new_encap)
|
|
{
|
|
if (rta->rta_type == XFRMA_ENCAP)
|
|
{ /* update encap tmpl */
|
|
tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rta);
|
|
tmpl->encap_sport = ntohs(new_src->get_port(new_src));
|
|
tmpl->encap_dport = ntohs(new_dst->get_port(new_dst));
|
|
}
|
|
memcpy(pos, rta, rta->rta_len);
|
|
pos += RTA_ALIGN(rta->rta_len);
|
|
hdr->nlmsg_len += RTA_ALIGN(rta->rta_len);
|
|
}
|
|
rta = RTA_NEXT(rta, rtasize);
|
|
}
|
|
|
|
rta = (struct rtattr*)pos;
|
|
if (tmpl == NULL && new_encap)
|
|
{ /* add tmpl if we are enabling it */
|
|
rta->rta_type = XFRMA_ENCAP;
|
|
rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_encap_tmpl));
|
|
|
|
hdr->nlmsg_len += rta->rta_len;
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rta);
|
|
tmpl->encap_type = UDP_ENCAP_ESPINUDP;
|
|
tmpl->encap_sport = ntohs(new_src->get_port(new_src));
|
|
tmpl->encap_dport = ntohs(new_dst->get_port(new_dst));
|
|
memset(&tmpl->encap_oa, 0, sizeof (xfrm_address_t));
|
|
|
|
rta = XFRM_RTA_NEXT(rta);
|
|
}
|
|
|
|
if (got_replay_state)
|
|
{ /* copy the replay data if available */
|
|
rta->rta_type = XFRMA_REPLAY_VAL;
|
|
rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_replay_state));
|
|
|
|
hdr->nlmsg_len += rta->rta_len;
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
return FAILED;
|
|
}
|
|
memcpy(RTA_DATA(rta), &replay, sizeof(replay));
|
|
|
|
rta = XFRM_RTA_NEXT(rta);
|
|
}
|
|
|
|
if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
|
|
{
|
|
DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi));
|
|
free(out);
|
|
return FAILED;
|
|
}
|
|
free(out);
|
|
|
|
return SUCCESS;
|
|
}
|
|
|
|
METHOD(kernel_ipsec_t, add_policy, status_t,
|
|
private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst,
|
|
traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
|
|
policy_dir_t direction, u_int32_t spi, protocol_id_t protocol,
|
|
u_int32_t reqid, mark_t mark, ipsec_mode_t mode, u_int16_t ipcomp,
|
|
u_int16_t cpi, bool routed)
|
|
{
|
|
policy_entry_t *current, *policy;
|
|
bool found = FALSE;
|
|
netlink_buf_t request;
|
|
struct xfrm_userpolicy_info *policy_info;
|
|
struct nlmsghdr *hdr;
|
|
|
|
/* create a policy */
|
|
policy = malloc_thing(policy_entry_t);
|
|
memset(policy, 0, sizeof(policy_entry_t));
|
|
policy->sel = ts2selector(src_ts, dst_ts);
|
|
policy->mark = mark.value & mark.mask;
|
|
policy->direction = direction;
|
|
|
|
/* find the policy, which matches EXACTLY */
|
|
this->mutex->lock(this->mutex);
|
|
current = this->policies->get(this->policies, policy);
|
|
if (current)
|
|
{
|
|
/* use existing policy */
|
|
current->refcount++;
|
|
if (mark.value)
|
|
{
|
|
DBG2(DBG_KNL, "policy %R === %R %N (mark %u/0x%8x) "
|
|
"already exists, increasing refcount",
|
|
src_ts, dst_ts, policy_dir_names, direction,
|
|
mark.value, mark.mask);
|
|
}
|
|
else
|
|
{
|
|
DBG2(DBG_KNL, "policy %R === %R %N "
|
|
"already exists, increasing refcount",
|
|
src_ts, dst_ts, policy_dir_names, direction);
|
|
}
|
|
free(policy);
|
|
policy = current;
|
|
found = TRUE;
|
|
}
|
|
else
|
|
{ /* apply the new one, if we have no such policy */
|
|
this->policies->put(this->policies, policy, policy);
|
|
policy->refcount = 1;
|
|
}
|
|
|
|
if (mark.value)
|
|
{
|
|
DBG2(DBG_KNL, "adding policy %R === %R %N (mark %u/0x%8x)",
|
|
src_ts, dst_ts, policy_dir_names, direction,
|
|
mark.value, mark.mask);
|
|
}
|
|
else
|
|
{
|
|
DBG2(DBG_KNL, "adding policy %R === %R %N",
|
|
src_ts, dst_ts, policy_dir_names, direction);
|
|
}
|
|
|
|
memset(&request, 0, sizeof(request));
|
|
hdr = (struct nlmsghdr*)request;
|
|
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
|
|
hdr->nlmsg_type = found ? XFRM_MSG_UPDPOLICY : XFRM_MSG_NEWPOLICY;
|
|
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_info));
|
|
|
|
policy_info = (struct xfrm_userpolicy_info*)NLMSG_DATA(hdr);
|
|
policy_info->sel = policy->sel;
|
|
policy_info->dir = policy->direction;
|
|
/* calculate priority based on source selector size, small size = high prio */
|
|
policy_info->priority = routed ? PRIO_LOW : PRIO_HIGH;
|
|
policy_info->priority -= policy->sel.prefixlen_s * 10;
|
|
policy_info->priority -= policy->sel.proto ? 2 : 0;
|
|
policy_info->priority -= policy->sel.sport_mask ? 1 : 0;
|
|
policy_info->action = XFRM_POLICY_ALLOW;
|
|
policy_info->share = XFRM_SHARE_ANY;
|
|
this->mutex->unlock(this->mutex);
|
|
|
|
/* policies don't expire */
|
|
policy_info->lft.soft_byte_limit = XFRM_INF;
|
|
policy_info->lft.soft_packet_limit = XFRM_INF;
|
|
policy_info->lft.hard_byte_limit = XFRM_INF;
|
|
policy_info->lft.hard_packet_limit = XFRM_INF;
|
|
policy_info->lft.soft_add_expires_seconds = 0;
|
|
policy_info->lft.hard_add_expires_seconds = 0;
|
|
policy_info->lft.soft_use_expires_seconds = 0;
|
|
policy_info->lft.hard_use_expires_seconds = 0;
|
|
|
|
struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_userpolicy_info);
|
|
rthdr->rta_type = XFRMA_TMPL;
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_user_tmpl));
|
|
|
|
hdr->nlmsg_len += rthdr->rta_len;
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
struct xfrm_user_tmpl *tmpl = (struct xfrm_user_tmpl*)RTA_DATA(rthdr);
|
|
|
|
if (ipcomp != IPCOMP_NONE)
|
|
{
|
|
tmpl->reqid = reqid;
|
|
tmpl->id.proto = IPPROTO_COMP;
|
|
tmpl->aalgos = tmpl->ealgos = tmpl->calgos = ~0;
|
|
tmpl->mode = mode2kernel(mode);
|
|
tmpl->optional = direction != POLICY_OUT;
|
|
tmpl->family = src->get_family(src);
|
|
|
|
host2xfrm(src, &tmpl->saddr);
|
|
host2xfrm(dst, &tmpl->id.daddr);
|
|
|
|
/* add an additional xfrm_user_tmpl */
|
|
rthdr->rta_len += RTA_LENGTH(sizeof(struct xfrm_user_tmpl));
|
|
hdr->nlmsg_len += RTA_LENGTH(sizeof(struct xfrm_user_tmpl));
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
tmpl++;
|
|
|
|
/* use transport mode for ESP if we have a tunnel mode IPcomp SA */
|
|
mode = MODE_TRANSPORT;
|
|
}
|
|
else
|
|
{
|
|
/* when using IPcomp, only the IPcomp SA uses tmp src/dst addresses */
|
|
host2xfrm(src, &tmpl->saddr);
|
|
host2xfrm(dst, &tmpl->id.daddr);
|
|
}
|
|
|
|
tmpl->reqid = reqid;
|
|
tmpl->id.proto = proto_ike2kernel(protocol);
|
|
tmpl->aalgos = tmpl->ealgos = tmpl->calgos = ~0;
|
|
tmpl->mode = mode2kernel(mode);
|
|
tmpl->family = src->get_family(src);
|
|
rthdr = XFRM_RTA_NEXT(rthdr);
|
|
|
|
if (mark.value)
|
|
{
|
|
struct xfrm_mark *mrk;
|
|
|
|
rthdr->rta_type = XFRMA_MARK;
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark));
|
|
|
|
hdr->nlmsg_len += rthdr->rta_len;
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
|
|
mrk->v = mark.value;
|
|
mrk->m = mark.mask;
|
|
}
|
|
|
|
if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
|
|
{
|
|
DBG1(DBG_KNL, "unable to add policy %R === %R %N", src_ts, dst_ts,
|
|
policy_dir_names, direction);
|
|
return FAILED;
|
|
}
|
|
|
|
/* install a route, if:
|
|
* - we are NOT updating a policy
|
|
* - this is a forward policy (to just get one for each child)
|
|
* - we are in tunnel/BEET mode
|
|
* - routing is not disabled via strongswan.conf
|
|
*/
|
|
if (policy->route == NULL && direction == POLICY_FWD &&
|
|
mode != MODE_TRANSPORT && this->install_routes)
|
|
{
|
|
route_entry_t *route = malloc_thing(route_entry_t);
|
|
|
|
if (charon->kernel_interface->get_address_by_ts(charon->kernel_interface,
|
|
dst_ts, &route->src_ip) == SUCCESS)
|
|
{
|
|
/* get the nexthop to src (src as we are in POLICY_FWD).*/
|
|
route->gateway = charon->kernel_interface->get_nexthop(
|
|
charon->kernel_interface, src);
|
|
/* install route via outgoing interface */
|
|
route->if_name = charon->kernel_interface->get_interface(
|
|
charon->kernel_interface, dst);
|
|
route->dst_net = chunk_alloc(policy->sel.family == AF_INET ? 4 : 16);
|
|
memcpy(route->dst_net.ptr, &policy->sel.saddr, route->dst_net.len);
|
|
route->prefixlen = policy->sel.prefixlen_s;
|
|
|
|
if (route->if_name)
|
|
{
|
|
switch (charon->kernel_interface->add_route(
|
|
charon->kernel_interface, route->dst_net,
|
|
route->prefixlen, route->gateway,
|
|
route->src_ip, route->if_name))
|
|
{
|
|
default:
|
|
DBG1(DBG_KNL, "unable to install source route for %H",
|
|
route->src_ip);
|
|
/* FALL */
|
|
case ALREADY_DONE:
|
|
/* route exists, do not uninstall */
|
|
route_entry_destroy(route);
|
|
break;
|
|
case SUCCESS:
|
|
/* cache the installed route */
|
|
policy->route = route;
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
route_entry_destroy(route);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
free(route);
|
|
}
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
METHOD(kernel_ipsec_t, query_policy, status_t,
|
|
private_kernel_netlink_ipsec_t *this, traffic_selector_t *src_ts,
|
|
traffic_selector_t *dst_ts, policy_dir_t direction, mark_t mark,
|
|
u_int32_t *use_time)
|
|
{
|
|
netlink_buf_t request;
|
|
struct nlmsghdr *out = NULL, *hdr;
|
|
struct xfrm_userpolicy_id *policy_id;
|
|
struct xfrm_userpolicy_info *policy = NULL;
|
|
size_t len;
|
|
|
|
memset(&request, 0, sizeof(request));
|
|
|
|
if (mark.value)
|
|
{
|
|
DBG2(DBG_KNL, "querying policy %R === %R %N (mark %u/0x%8x)",
|
|
src_ts, dst_ts, policy_dir_names, direction,
|
|
mark.value, mark.mask);
|
|
}
|
|
else
|
|
{
|
|
DBG2(DBG_KNL, "querying policy %R === %R %N", src_ts, dst_ts,
|
|
policy_dir_names, direction);
|
|
}
|
|
hdr = (struct nlmsghdr*)request;
|
|
hdr->nlmsg_flags = NLM_F_REQUEST;
|
|
hdr->nlmsg_type = XFRM_MSG_GETPOLICY;
|
|
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id));
|
|
|
|
policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr);
|
|
policy_id->sel = ts2selector(src_ts, dst_ts);
|
|
policy_id->dir = direction;
|
|
|
|
if (mark.value)
|
|
{
|
|
struct xfrm_mark *mrk;
|
|
struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_userpolicy_id);
|
|
|
|
rthdr->rta_type = XFRMA_MARK;
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark));
|
|
|
|
hdr->nlmsg_len += rthdr->rta_len;
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
|
|
mrk->v = mark.value;
|
|
mrk->m = mark.mask;
|
|
}
|
|
|
|
if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS)
|
|
{
|
|
hdr = out;
|
|
while (NLMSG_OK(hdr, len))
|
|
{
|
|
switch (hdr->nlmsg_type)
|
|
{
|
|
case XFRM_MSG_NEWPOLICY:
|
|
{
|
|
policy = (struct xfrm_userpolicy_info*)NLMSG_DATA(hdr);
|
|
break;
|
|
}
|
|
case NLMSG_ERROR:
|
|
{
|
|
struct nlmsgerr *err = NLMSG_DATA(hdr);
|
|
DBG1(DBG_KNL, "querying policy failed: %s (%d)",
|
|
strerror(-err->error), -err->error);
|
|
break;
|
|
}
|
|
default:
|
|
hdr = NLMSG_NEXT(hdr, len);
|
|
continue;
|
|
case NLMSG_DONE:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (policy == NULL)
|
|
{
|
|
DBG2(DBG_KNL, "unable to query policy %R === %R %N", src_ts, dst_ts,
|
|
policy_dir_names, direction);
|
|
free(out);
|
|
return FAILED;
|
|
}
|
|
|
|
if (policy->curlft.use_time)
|
|
{
|
|
/* we need the monotonic time, but the kernel returns system time. */
|
|
*use_time = time_monotonic(NULL) - (time(NULL) - policy->curlft.use_time);
|
|
}
|
|
else
|
|
{
|
|
*use_time = 0;
|
|
}
|
|
|
|
free(out);
|
|
return SUCCESS;
|
|
}
|
|
|
|
METHOD(kernel_ipsec_t, del_policy, status_t,
|
|
private_kernel_netlink_ipsec_t *this, traffic_selector_t *src_ts,
|
|
traffic_selector_t *dst_ts, policy_dir_t direction, mark_t mark,
|
|
bool unrouted)
|
|
{
|
|
policy_entry_t *current, policy, *to_delete = NULL;
|
|
route_entry_t *route;
|
|
netlink_buf_t request;
|
|
struct nlmsghdr *hdr;
|
|
struct xfrm_userpolicy_id *policy_id;
|
|
|
|
if (mark.value)
|
|
{
|
|
DBG2(DBG_KNL, "deleting policy %R === %R %N (mark %u/0x%8x)",
|
|
src_ts, dst_ts, policy_dir_names, direction,
|
|
mark.value, mark.mask);
|
|
}
|
|
else
|
|
{
|
|
DBG2(DBG_KNL, "deleting policy %R === %R %N",
|
|
src_ts, dst_ts, policy_dir_names, direction);
|
|
}
|
|
|
|
/* create a policy */
|
|
memset(&policy, 0, sizeof(policy_entry_t));
|
|
policy.sel = ts2selector(src_ts, dst_ts);
|
|
policy.mark = mark.value & mark.mask;
|
|
policy.direction = direction;
|
|
|
|
/* find the policy */
|
|
this->mutex->lock(this->mutex);
|
|
current = this->policies->get(this->policies, &policy);
|
|
if (current)
|
|
{
|
|
to_delete = current;
|
|
if (--to_delete->refcount > 0)
|
|
{
|
|
/* is used by more SAs, keep in kernel */
|
|
DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed");
|
|
this->mutex->unlock(this->mutex);
|
|
return SUCCESS;
|
|
}
|
|
/* remove if last reference */
|
|
this->policies->remove(this->policies, to_delete);
|
|
}
|
|
this->mutex->unlock(this->mutex);
|
|
if (!to_delete)
|
|
{
|
|
if (mark.value)
|
|
{
|
|
DBG1(DBG_KNL, "deleting policy %R === %R %N (mark %u/0x%8x) "
|
|
"failed, not found", src_ts, dst_ts, policy_dir_names,
|
|
direction, mark.value, mark.mask);
|
|
}
|
|
else
|
|
{
|
|
DBG1(DBG_KNL, "deleting policy %R === %R %N failed, not found",
|
|
src_ts, dst_ts, policy_dir_names, direction);
|
|
}
|
|
return NOT_FOUND;
|
|
}
|
|
|
|
memset(&request, 0, sizeof(request));
|
|
|
|
hdr = (struct nlmsghdr*)request;
|
|
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
|
|
hdr->nlmsg_type = XFRM_MSG_DELPOLICY;
|
|
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id));
|
|
|
|
policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr);
|
|
policy_id->sel = to_delete->sel;
|
|
policy_id->dir = direction;
|
|
|
|
if (mark.value)
|
|
{
|
|
struct xfrm_mark *mrk;
|
|
struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_userpolicy_id);
|
|
|
|
rthdr->rta_type = XFRMA_MARK;
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark));
|
|
hdr->nlmsg_len += rthdr->rta_len;
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
|
|
mrk->v = mark.value;
|
|
mrk->m = mark.mask;
|
|
}
|
|
|
|
route = to_delete->route;
|
|
free(to_delete);
|
|
|
|
if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
|
|
{
|
|
if (mark.value)
|
|
{
|
|
DBG1(DBG_KNL, "unable to delete policy %R === %R %N "
|
|
"(mark %u/0x%8x)", src_ts, dst_ts, policy_dir_names,
|
|
direction, mark.value, mark.mask);
|
|
}
|
|
else
|
|
{
|
|
DBG1(DBG_KNL, "unable to delete policy %R === %R %N",
|
|
src_ts, dst_ts, policy_dir_names, direction);
|
|
}
|
|
return FAILED;
|
|
}
|
|
|
|
if (route)
|
|
{
|
|
if (charon->kernel_interface->del_route(charon->kernel_interface,
|
|
route->dst_net, route->prefixlen, route->gateway,
|
|
route->src_ip, route->if_name) != SUCCESS)
|
|
{
|
|
DBG1(DBG_KNL, "error uninstalling route installed with "
|
|
"policy %R === %R %N", src_ts, dst_ts,
|
|
policy_dir_names, direction);
|
|
}
|
|
route_entry_destroy(route);
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
METHOD(kernel_ipsec_t, bypass_socket, bool,
|
|
private_kernel_netlink_ipsec_t *this, int fd, int family)
|
|
{
|
|
struct xfrm_userpolicy_info policy;
|
|
u_int sol, ipsec_policy;
|
|
|
|
switch (family)
|
|
{
|
|
case AF_INET:
|
|
sol = SOL_IP;
|
|
ipsec_policy = IP_XFRM_POLICY;
|
|
break;
|
|
case AF_INET6:
|
|
sol = SOL_IPV6;
|
|
ipsec_policy = IPV6_XFRM_POLICY;
|
|
break;
|
|
default:
|
|
return FALSE;
|
|
}
|
|
|
|
memset(&policy, 0, sizeof(policy));
|
|
policy.action = XFRM_POLICY_ALLOW;
|
|
policy.sel.family = family;
|
|
|
|
policy.dir = XFRM_POLICY_OUT;
|
|
if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0)
|
|
{
|
|
DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s",
|
|
strerror(errno));
|
|
return FALSE;
|
|
}
|
|
policy.dir = XFRM_POLICY_IN;
|
|
if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0)
|
|
{
|
|
DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s",
|
|
strerror(errno));
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
METHOD(kernel_ipsec_t, destroy, void,
|
|
private_kernel_netlink_ipsec_t *this)
|
|
{
|
|
enumerator_t *enumerator;
|
|
policy_entry_t *policy;
|
|
|
|
if (this->job)
|
|
{
|
|
this->job->cancel(this->job);
|
|
}
|
|
if (this->socket_xfrm_events > 0)
|
|
{
|
|
close(this->socket_xfrm_events);
|
|
}
|
|
DESTROY_IF(this->socket_xfrm);
|
|
enumerator = this->policies->create_enumerator(this->policies);
|
|
while (enumerator->enumerate(enumerator, &policy, &policy))
|
|
{
|
|
free(policy);
|
|
}
|
|
enumerator->destroy(enumerator);
|
|
this->policies->destroy(this->policies);
|
|
this->mutex->destroy(this->mutex);
|
|
free(this);
|
|
}
|
|
|
|
/*
|
|
* Described in header.
|
|
*/
|
|
kernel_netlink_ipsec_t *kernel_netlink_ipsec_create()
|
|
{
|
|
private_kernel_netlink_ipsec_t *this;
|
|
struct sockaddr_nl addr;
|
|
int fd;
|
|
|
|
INIT(this,
|
|
.public.interface = {
|
|
.get_spi = _get_spi,
|
|
.get_cpi = _get_cpi,
|
|
.add_sa = _add_sa,
|
|
.update_sa = _update_sa,
|
|
.query_sa = _query_sa,
|
|
.del_sa = _del_sa,
|
|
.add_policy = _add_policy,
|
|
.query_policy = _query_policy,
|
|
.del_policy = _del_policy,
|
|
.bypass_socket = _bypass_socket,
|
|
.destroy = _destroy,
|
|
},
|
|
.policies = hashtable_create((hashtable_hash_t)policy_hash,
|
|
(hashtable_equals_t)policy_equals, 32),
|
|
.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
|
|
.install_routes = lib->settings->get_bool(lib->settings,
|
|
"charon.install_routes", TRUE),
|
|
);
|
|
|
|
/* disable lifetimes for allocated SPIs in kernel */
|
|
fd = open("/proc/sys/net/core/xfrm_acq_expires", O_WRONLY);
|
|
if (fd)
|
|
{
|
|
ignore_result(write(fd, "165", 3));
|
|
close(fd);
|
|
}
|
|
|
|
this->socket_xfrm = netlink_socket_create(NETLINK_XFRM);
|
|
if (!this->socket_xfrm)
|
|
{
|
|
destroy(this);
|
|
return NULL;
|
|
}
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
addr.nl_family = AF_NETLINK;
|
|
|
|
/* create and bind XFRM socket for ACQUIRE, EXPIRE, MIGRATE & MAPPING */
|
|
this->socket_xfrm_events = socket(AF_NETLINK, SOCK_RAW, NETLINK_XFRM);
|
|
if (this->socket_xfrm_events <= 0)
|
|
{
|
|
DBG1(DBG_KNL, "unable to create XFRM event socket");
|
|
destroy(this);
|
|
return NULL;
|
|
}
|
|
addr.nl_groups = XFRMNLGRP(ACQUIRE) | XFRMNLGRP(EXPIRE) |
|
|
XFRMNLGRP(MIGRATE) | XFRMNLGRP(MAPPING);
|
|
if (bind(this->socket_xfrm_events, (struct sockaddr*)&addr, sizeof(addr)))
|
|
{
|
|
DBG1(DBG_KNL, "unable to bind XFRM event socket");
|
|
destroy(this);
|
|
return NULL;
|
|
}
|
|
this->job = callback_job_create((callback_job_cb_t)receive_events,
|
|
this, NULL, NULL);
|
|
charon->processor->queue_job(charon->processor, (job_t*)this->job);
|
|
|
|
return &this->public;
|
|
}
|
|
|