2780 lines
70 KiB
C
2780 lines
70 KiB
C
/*
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* Copyright (C) 2006-2012 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 <hydra.h>
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#include <debug.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 <utils/linked_list.h>
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#include <processing/jobs/callback_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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/* from linux/udp.h */
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#ifndef UDP_ENCAP
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#define UDP_ENCAP 100
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#endif
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#ifndef UDP_ENCAP_ESPINUDP
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#define UDP_ENCAP_ESPINUDP 2
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#endif
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/* this is not defined on some platforms */
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#ifndef SOL_UDP
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#define SOL_UDP IPPROTO_UDP
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#endif
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/** Default priority of installed policies */
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#define PRIO_BASE 512
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/** Default replay window size, if not set using charon.replay_window */
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#define DEFAULT_REPLAY_WINDOW 32
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/**
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* Map the limit for bytes and packets to XFRM_INF by 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) + \
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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)) + \
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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_REPLAY_ESN_VAL,
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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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"XFRMA_ALG_AUTH_TRUNC",
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"XFRMA_MARK",
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"XFRMA_TFCPAD",
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"XFRMA_REPLAY_ESN_VAL",
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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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{ENCR_SERPENT_CBC, "serpent" },
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{ENCR_TWOFISH_CBC, "twofish" },
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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_MD5_128, "hmac(md5)" },
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{AUTH_HMAC_SHA1_96, "sha1" },
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{AUTH_HMAC_SHA1_160, "hmac(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(transform_type_t type, int ikev2)
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{
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kernel_algorithm_t *list;
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char *name = NULL;
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switch (type)
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{
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case ENCRYPTION_ALGORITHM:
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list = encryption_algs;
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break;
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case INTEGRITY_ALGORITHM:
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list = integrity_algs;
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break;
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case COMPRESSION_ALGORITHM:
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list = compression_algs;
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break;
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default:
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return NULL;
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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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hydra->kernel_interface->lookup_algorithm(hydra->kernel_interface, ikev2,
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type, NULL, &name);
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return name;
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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 installed policies
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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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* Hash table of IPsec SAs using policies (ipsec_sa_t)
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*/
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hashtable_t *sas;
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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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* Whether to track the history of a policy
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*/
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bool policy_history;
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/**
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* Size of the replay window, in packets
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*/
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u_int32_t replay_window;
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/**
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* Size of the replay window bitmap, in bytes
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*/
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u_int32_t replay_bmp;
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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 a 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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/**
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* Compare two route_entry_t objects
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*/
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static bool route_entry_equals(route_entry_t *a, route_entry_t *b)
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{
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return a->if_name && b->if_name && streq(a->if_name, b->if_name) &&
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a->src_ip->ip_equals(a->src_ip, b->src_ip) &&
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a->gateway->ip_equals(a->gateway, b->gateway) &&
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chunk_equals(a->dst_net, b->dst_net) && a->prefixlen == b->prefixlen;
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}
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typedef struct ipsec_sa_t ipsec_sa_t;
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/**
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* IPsec SA assigned to a policy.
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*/
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struct ipsec_sa_t {
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/** Source address of this SA */
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host_t *src;
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/** Destination address of this SA */
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host_t *dst;
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/** Optional mark */
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mark_t mark;
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/** Description of this SA */
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ipsec_sa_cfg_t cfg;
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/** Reference count for this SA */
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refcount_t refcount;
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};
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/**
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* Hash function for ipsec_sa_t objects
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*/
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static u_int ipsec_sa_hash(ipsec_sa_t *sa)
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{
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return chunk_hash_inc(sa->src->get_address(sa->src),
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chunk_hash_inc(sa->dst->get_address(sa->dst),
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chunk_hash_inc(chunk_from_thing(sa->mark),
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chunk_hash(chunk_from_thing(sa->cfg)))));
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}
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/**
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* Equality function for ipsec_sa_t objects
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*/
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static bool ipsec_sa_equals(ipsec_sa_t *sa, ipsec_sa_t *other_sa)
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{
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return sa->src->ip_equals(sa->src, other_sa->src) &&
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sa->dst->ip_equals(sa->dst, other_sa->dst) &&
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memeq(&sa->mark, &other_sa->mark, sizeof(mark_t)) &&
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memeq(&sa->cfg, &other_sa->cfg, sizeof(ipsec_sa_cfg_t));
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}
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/**
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* Allocate or reference an IPsec SA object
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*/
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static ipsec_sa_t *ipsec_sa_create(private_kernel_netlink_ipsec_t *this,
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host_t *src, host_t *dst, mark_t mark,
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ipsec_sa_cfg_t *cfg)
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{
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ipsec_sa_t *sa, *found;
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INIT(sa,
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.src = src,
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.dst = dst,
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.mark = mark,
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.cfg = *cfg,
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);
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found = this->sas->get(this->sas, sa);
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if (!found)
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{
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sa->src = src->clone(src);
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sa->dst = dst->clone(dst);
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this->sas->put(this->sas, sa, sa);
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}
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else
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{
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free(sa);
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sa = found;
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}
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ref_get(&sa->refcount);
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return sa;
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}
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/**
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* Release and destroy an IPsec SA object
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*/
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static void ipsec_sa_destroy(private_kernel_netlink_ipsec_t *this,
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ipsec_sa_t *sa)
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{
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if (ref_put(&sa->refcount))
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{
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this->sas->remove(this->sas, sa);
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DESTROY_IF(sa->src);
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DESTROY_IF(sa->dst);
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free(sa);
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}
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}
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typedef struct policy_sa_t policy_sa_t;
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typedef struct policy_sa_fwd_t policy_sa_fwd_t;
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/**
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* Mapping between a policy and an IPsec SA.
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*/
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struct policy_sa_t {
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/** Priority assigned to the policy when installed with this SA */
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u_int32_t priority;
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/** Type of the policy */
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policy_type_t type;
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/** Assigned SA */
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ipsec_sa_t *sa;
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};
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/**
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* For forward policies we also cache the traffic selectors in order to install
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* the route.
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*/
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struct policy_sa_fwd_t {
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/** Generic interface */
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policy_sa_t generic;
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/** Source traffic selector of this policy */
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traffic_selector_t *src_ts;
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|
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/** Destination traffic selector of this policy */
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traffic_selector_t *dst_ts;
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};
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/**
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* Create a policy_sa(_fwd)_t object
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*/
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static policy_sa_t *policy_sa_create(private_kernel_netlink_ipsec_t *this,
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policy_dir_t dir, policy_type_t type, host_t *src, host_t *dst,
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traffic_selector_t *src_ts, traffic_selector_t *dst_ts, mark_t mark,
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ipsec_sa_cfg_t *cfg)
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{
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policy_sa_t *policy;
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|
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if (dir == POLICY_FWD)
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{
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policy_sa_fwd_t *fwd;
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INIT(fwd,
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.src_ts = src_ts->clone(src_ts),
|
|
.dst_ts = dst_ts->clone(dst_ts),
|
|
);
|
|
policy = &fwd->generic;
|
|
}
|
|
else
|
|
{
|
|
INIT(policy, .priority = 0);
|
|
}
|
|
policy->type = type;
|
|
policy->sa = ipsec_sa_create(this, src, dst, mark, cfg);
|
|
return policy;
|
|
}
|
|
|
|
/**
|
|
* Destroy a policy_sa(_fwd)_t object
|
|
*/
|
|
static void policy_sa_destroy(policy_sa_t *policy, policy_dir_t *dir,
|
|
private_kernel_netlink_ipsec_t *this)
|
|
{
|
|
if (*dir == POLICY_FWD)
|
|
{
|
|
policy_sa_fwd_t *fwd = (policy_sa_fwd_t*)policy;
|
|
fwd->src_ts->destroy(fwd->src_ts);
|
|
fwd->dst_ts->destroy(fwd->dst_ts);
|
|
}
|
|
ipsec_sa_destroy(this, policy->sa);
|
|
free(policy);
|
|
}
|
|
|
|
typedef struct policy_entry_t policy_entry_t;
|
|
|
|
/**
|
|
* Installed kernel policy.
|
|
*/
|
|
struct policy_entry_t {
|
|
|
|
/** Direction of this policy: in, out, forward */
|
|
u_int8_t direction;
|
|
|
|
/** Parameters of installed policy */
|
|
struct xfrm_selector sel;
|
|
|
|
/** Optional mark */
|
|
u_int32_t mark;
|
|
|
|
/** Associated route installed for this policy */
|
|
route_entry_t *route;
|
|
|
|
/** List of SAs this policy is used by, ordered by priority */
|
|
linked_list_t *used_by;
|
|
};
|
|
|
|
/**
|
|
* Destroy a policy_entry_t object
|
|
*/
|
|
static void policy_entry_destroy(private_kernel_netlink_ipsec_t *this,
|
|
policy_entry_t *policy)
|
|
{
|
|
if (policy->route)
|
|
{
|
|
route_entry_destroy(policy->route);
|
|
}
|
|
if (policy->used_by)
|
|
{
|
|
policy->used_by->invoke_function(policy->used_by,
|
|
(linked_list_invoke_t)policy_sa_destroy,
|
|
&policy->direction, this);
|
|
policy->used_by->destroy(policy->used_by);
|
|
}
|
|
free(policy);
|
|
}
|
|
|
|
/**
|
|
* Hash function for policy_entry_t objects
|
|
*/
|
|
static u_int policy_hash(policy_entry_t *key)
|
|
{
|
|
chunk_t chunk = chunk_create((void*)&key->sel,
|
|
sizeof(struct xfrm_selector) + sizeof(u_int32_t));
|
|
return chunk_hash(chunk);
|
|
}
|
|
|
|
/**
|
|
* Equality function for policy_entry_t objects
|
|
*/
|
|
static bool policy_equals(policy_entry_t *key, policy_entry_t *other_key)
|
|
{
|
|
return memeq(&key->sel, &other_key->sel,
|
|
sizeof(struct xfrm_selector) + sizeof(u_int32_t)) &&
|
|
key->direction == other_key->direction;
|
|
}
|
|
|
|
/**
|
|
* Calculate the priority of a policy
|
|
*/
|
|
static inline u_int32_t get_priority(policy_entry_t *policy,
|
|
policy_priority_t prio)
|
|
{
|
|
u_int32_t priority = PRIO_BASE;
|
|
switch (prio)
|
|
{
|
|
case POLICY_PRIORITY_FALLBACK:
|
|
priority <<= 1;
|
|
/* fall-through */
|
|
case POLICY_PRIORITY_ROUTED:
|
|
priority <<= 1;
|
|
/* fall-through */
|
|
case POLICY_PRIORITY_DEFAULT:
|
|
break;
|
|
}
|
|
/* calculate priority based on selector size, small size = high prio */
|
|
priority -= policy->sel.prefixlen_s;
|
|
priority -= policy->sel.prefixlen_d;
|
|
priority <<= 2; /* make some room for the two flags */
|
|
priority += policy->sel.sport_mask || policy->sel.dport_mask ? 0 : 2;
|
|
priority += policy->sel.proto ? 0 : 1;
|
|
return priority;
|
|
}
|
|
|
|
/**
|
|
* Convert the general ipsec mode to the one defined in xfrm.h
|
|
*/
|
|
static u_int8_t mode2kernel(ipsec_mode_t mode)
|
|
{
|
|
switch (mode)
|
|
{
|
|
case MODE_TRANSPORT:
|
|
return XFRM_MODE_TRANSPORT;
|
|
case MODE_TUNNEL:
|
|
return XFRM_MODE_TUNNEL;
|
|
case MODE_BEET:
|
|
return XFRM_MODE_BEET;
|
|
default:
|
|
return mode;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Convert a host_t to a struct xfrm_address
|
|
*/
|
|
static void host2xfrm(host_t *host, xfrm_address_t *xfrm)
|
|
{
|
|
chunk_t chunk = host->get_address(host);
|
|
memcpy(xfrm, chunk.ptr, min(chunk.len, sizeof(xfrm_address_t)));
|
|
}
|
|
|
|
/**
|
|
* Convert a struct xfrm_address to a host_t
|
|
*/
|
|
static host_t* xfrm2host(int family, xfrm_address_t *xfrm, u_int16_t port)
|
|
{
|
|
chunk_t chunk;
|
|
|
|
switch (family)
|
|
{
|
|
case AF_INET:
|
|
chunk = chunk_create((u_char*)&xfrm->a4, sizeof(xfrm->a4));
|
|
break;
|
|
case AF_INET6:
|
|
chunk = chunk_create((u_char*)&xfrm->a6, sizeof(xfrm->a6));
|
|
break;
|
|
default:
|
|
return NULL;
|
|
}
|
|
return host_create_from_chunk(family, chunk, ntohs(port));
|
|
}
|
|
|
|
/**
|
|
* Convert a traffic selector address range to subnet and its mask.
|
|
*/
|
|
static void ts2subnet(traffic_selector_t* ts,
|
|
xfrm_address_t *net, u_int8_t *mask)
|
|
{
|
|
host_t *net_host;
|
|
chunk_t net_chunk;
|
|
|
|
ts->to_subnet(ts, &net_host, mask);
|
|
net_chunk = net_host->get_address(net_host);
|
|
memcpy(net, net_chunk.ptr, net_chunk.len);
|
|
net_host->destroy(net_host);
|
|
}
|
|
|
|
/**
|
|
* Convert a traffic selector port range to port/portmask
|
|
*/
|
|
static void ts2ports(traffic_selector_t* ts,
|
|
u_int16_t *port, u_int16_t *mask)
|
|
{
|
|
/* Linux does not seem to accept complex portmasks. Only
|
|
* any or a specific port is allowed. We set to any, if we have
|
|
* a port range, or to a specific, if we have one port only.
|
|
*/
|
|
u_int16_t from, to;
|
|
|
|
from = ts->get_from_port(ts);
|
|
to = ts->get_to_port(ts);
|
|
|
|
if (from == to)
|
|
{
|
|
*port = htons(from);
|
|
*mask = ~0;
|
|
}
|
|
else
|
|
{
|
|
*port = 0;
|
|
*mask = 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Convert a pair of traffic_selectors to an xfrm_selector
|
|
*/
|
|
static struct xfrm_selector ts2selector(traffic_selector_t *src,
|
|
traffic_selector_t *dst)
|
|
{
|
|
struct xfrm_selector sel;
|
|
|
|
memset(&sel, 0, sizeof(sel));
|
|
sel.family = (src->get_type(src) == TS_IPV4_ADDR_RANGE) ? AF_INET : AF_INET6;
|
|
/* src or dest proto may be "any" (0), use more restrictive one */
|
|
sel.proto = max(src->get_protocol(src), dst->get_protocol(dst));
|
|
ts2subnet(dst, &sel.daddr, &sel.prefixlen_d);
|
|
ts2subnet(src, &sel.saddr, &sel.prefixlen_s);
|
|
ts2ports(dst, &sel.dport, &sel.dport_mask);
|
|
ts2ports(src, &sel.sport, &sel.sport_mask);
|
|
sel.ifindex = 0;
|
|
sel.user = 0;
|
|
|
|
return sel;
|
|
}
|
|
|
|
/**
|
|
* Convert an xfrm_selector to a src|dst traffic_selector
|
|
*/
|
|
static traffic_selector_t* selector2ts(struct xfrm_selector *sel, bool src)
|
|
{
|
|
u_char *addr;
|
|
u_int8_t prefixlen;
|
|
u_int16_t port = 0;
|
|
host_t *host = NULL;
|
|
|
|
if (src)
|
|
{
|
|
addr = (u_char*)&sel->saddr;
|
|
prefixlen = sel->prefixlen_s;
|
|
if (sel->sport_mask)
|
|
{
|
|
port = htons(sel->sport);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
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)
|
|
{
|
|
struct xfrm_user_acquire *acquire;
|
|
struct rtattr *rta;
|
|
size_t rtasize;
|
|
traffic_selector_t *src_ts, *dst_ts;
|
|
u_int32_t reqid = 0;
|
|
int proto = 0;
|
|
|
|
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);
|
|
|
|
hydra->kernel_interface->acquire(hydra->kernel_interface, reqid, src_ts,
|
|
dst_ts);
|
|
}
|
|
|
|
/**
|
|
* Process a XFRM_MSG_EXPIRE from kernel
|
|
*/
|
|
static void process_expire(private_kernel_netlink_ipsec_t *this,
|
|
struct nlmsghdr *hdr)
|
|
{
|
|
struct xfrm_user_expire *expire;
|
|
u_int32_t spi, reqid;
|
|
u_int8_t protocol;
|
|
|
|
expire = (struct xfrm_user_expire*)NLMSG_DATA(hdr);
|
|
protocol = expire->state.id.proto;
|
|
spi = expire->state.id.spi;
|
|
reqid = expire->state.reqid;
|
|
|
|
DBG2(DBG_KNL, "received a XFRM_MSG_EXPIRE");
|
|
|
|
if (protocol != IPPROTO_ESP && protocol != IPPROTO_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;
|
|
}
|
|
|
|
hydra->kernel_interface->expire(hydra->kernel_interface, reqid, protocol,
|
|
spi, expire->hard != 0);
|
|
}
|
|
|
|
/**
|
|
* Process a XFRM_MSG_MIGRATE from kernel
|
|
*/
|
|
static void process_migrate(private_kernel_netlink_ipsec_t *this,
|
|
struct nlmsghdr *hdr)
|
|
{
|
|
struct xfrm_userpolicy_id *policy_id;
|
|
struct rtattr *rta;
|
|
size_t rtasize;
|
|
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;
|
|
u_int32_t reqid = 0;
|
|
policy_dir_t dir;
|
|
|
|
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;
|
|
|
|
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);
|
|
reqid = migrate->reqid;
|
|
DBG2(DBG_KNL, " migrate %H...%H to %H...%H, reqid {%u}",
|
|
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)
|
|
{
|
|
hydra->kernel_interface->migrate(hydra->kernel_interface, reqid,
|
|
src_ts, dst_ts, dir, local, remote);
|
|
}
|
|
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)
|
|
{
|
|
struct xfrm_user_mapping *mapping;
|
|
u_int32_t spi, reqid;
|
|
|
|
mapping = (struct xfrm_user_mapping*)NLMSG_DATA(hdr);
|
|
spi = mapping->id.spi;
|
|
reqid = mapping->reqid;
|
|
|
|
DBG2(DBG_KNL, "received a XFRM_MSG_MAPPING");
|
|
|
|
if (mapping->id.proto == IPPROTO_ESP)
|
|
{
|
|
host_t *host;
|
|
host = xfrm2host(mapping->id.family, &mapping->new_saddr,
|
|
mapping->new_sport);
|
|
if (host)
|
|
{
|
|
hydra->kernel_interface->mapping(hydra->kernel_interface, reqid,
|
|
spi, host);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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,
|
|
u_int8_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, 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, u_int8_t protocol, u_int32_t reqid, mark_t mark,
|
|
u_int32_t tfc, 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 esn, 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;
|
|
status_t status = FAILED;
|
|
|
|
/* 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,
|
|
tfc, &lft, ENCR_UNDEFINED, chunk_empty, AUTH_UNDEFINED,
|
|
chunk_empty, mode, ipcomp, 0, FALSE, FALSE, inbound, NULL, NULL);
|
|
ipcomp = IPCOMP_NONE;
|
|
/* use transport mode ESP SA, IPComp uses tunnel mode */
|
|
mode = MODE_TRANSPORT;
|
|
}
|
|
|
|
memset(&request, 0, sizeof(request));
|
|
|
|
DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%u} (mark "
|
|
"%u/0x%08x)", ntohl(spi), reqid, mark.value, mark.mask);
|
|
|
|
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 = 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:
|
|
case MODE_TRANSPORT:
|
|
if(src_ts && dst_ts)
|
|
{
|
|
sa->sel = ts2selector(src_ts, dst_ts);
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
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_ALGORITHM, enc_alg);
|
|
if (alg_name == NULL)
|
|
{
|
|
DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
|
|
encryption_algorithm_names, enc_alg);
|
|
goto 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 += RTA_ALIGN(rthdr->rta_len);
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
goto 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_ALGORITHM, enc_alg);
|
|
if (alg_name == NULL)
|
|
{
|
|
DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
|
|
encryption_algorithm_names, enc_alg);
|
|
goto 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 += RTA_ALIGN(rthdr->rta_len);
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
goto 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)
|
|
{
|
|
u_int trunc_len = 0;
|
|
|
|
alg_name = lookup_algorithm(INTEGRITY_ALGORITHM, int_alg);
|
|
if (alg_name == NULL)
|
|
{
|
|
DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
|
|
integrity_algorithm_names, int_alg);
|
|
goto failed;
|
|
}
|
|
DBG2(DBG_KNL, " using integrity algorithm %N with key size %d",
|
|
integrity_algorithm_names, int_alg, int_key.len * 8);
|
|
|
|
switch (int_alg)
|
|
{
|
|
case AUTH_HMAC_MD5_128:
|
|
case AUTH_HMAC_SHA2_256_128:
|
|
trunc_len = 128;
|
|
break;
|
|
case AUTH_HMAC_SHA1_160:
|
|
trunc_len = 160;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (trunc_len)
|
|
{
|
|
struct xfrm_algo_auth* algo;
|
|
|
|
/* the kernel uses SHA256 with 96 bit truncation by default,
|
|
* use specified truncation size supported by newer kernels.
|
|
* also use this for untruncated MD5 and SHA1. */
|
|
rthdr->rta_type = XFRMA_ALG_AUTH_TRUNC;
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo_auth) +
|
|
int_key.len);
|
|
|
|
hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
goto failed;
|
|
}
|
|
|
|
algo = (struct xfrm_algo_auth*)RTA_DATA(rthdr);
|
|
algo->alg_key_len = int_key.len * 8;
|
|
algo->alg_trunc_len = trunc_len;
|
|
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 += RTA_ALIGN(rthdr->rta_len);
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
goto 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_ALGORITHM, ipcomp);
|
|
if (alg_name == NULL)
|
|
{
|
|
DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
|
|
ipcomp_transform_names, ipcomp);
|
|
goto failed;
|
|
}
|
|
DBG2(DBG_KNL, " using compression algorithm %N",
|
|
ipcomp_transform_names, ipcomp);
|
|
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo));
|
|
hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
goto 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 += RTA_ALIGN(rthdr->rta_len);
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
goto 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 += RTA_ALIGN(rthdr->rta_len);
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
goto failed;
|
|
}
|
|
|
|
mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
|
|
mrk->v = mark.value;
|
|
mrk->m = mark.mask;
|
|
rthdr = XFRM_RTA_NEXT(rthdr);
|
|
}
|
|
|
|
if (tfc)
|
|
{
|
|
u_int32_t *tfcpad;
|
|
|
|
rthdr->rta_type = XFRMA_TFCPAD;
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(u_int32_t));
|
|
|
|
hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
goto failed;
|
|
}
|
|
|
|
tfcpad = (u_int32_t*)RTA_DATA(rthdr);
|
|
*tfcpad = tfc;
|
|
rthdr = XFRM_RTA_NEXT(rthdr);
|
|
}
|
|
|
|
if (protocol != IPPROTO_COMP)
|
|
{
|
|
if (esn || this->replay_window > DEFAULT_REPLAY_WINDOW)
|
|
{
|
|
/* for ESN or larger replay windows we need the new
|
|
* XFRMA_REPLAY_ESN_VAL attribute to configure a bitmap */
|
|
struct xfrm_replay_state_esn *replay;
|
|
|
|
rthdr->rta_type = XFRMA_REPLAY_ESN_VAL;
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_replay_state_esn) +
|
|
(this->replay_window + 7) / 8);
|
|
|
|
hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
goto failed;
|
|
}
|
|
|
|
replay = (struct xfrm_replay_state_esn*)RTA_DATA(rthdr);
|
|
/* bmp_len contains number uf __u32's */
|
|
replay->bmp_len = this->replay_bmp;
|
|
replay->replay_window = this->replay_window;
|
|
DBG2(DBG_KNL, " using replay window of %u bytes",
|
|
this->replay_window);
|
|
|
|
rthdr = XFRM_RTA_NEXT(rthdr);
|
|
if (esn)
|
|
{
|
|
DBG2(DBG_KNL, " using extended sequence numbers (ESN)");
|
|
sa->flags |= XFRM_STATE_ESN;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
sa->replay_window = DEFAULT_REPLAY_WINDOW;
|
|
}
|
|
}
|
|
|
|
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%08x)", ntohl(spi), mark.value, mark.mask);
|
|
}
|
|
else
|
|
{
|
|
DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x", ntohl(spi));
|
|
}
|
|
goto failed;
|
|
}
|
|
|
|
status = SUCCESS;
|
|
|
|
failed:
|
|
memwipe(request, sizeof(request));
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* Get the ESN replay state (i.e. sequence numbers) of an SA.
|
|
*
|
|
* Allocates into one the replay state structure we get from the kernel.
|
|
*/
|
|
static void get_replay_state(private_kernel_netlink_ipsec_t *this,
|
|
u_int32_t spi, u_int8_t protocol, host_t *dst,
|
|
struct xfrm_replay_state_esn **replay_esn,
|
|
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 = 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)
|
|
{
|
|
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(**replay))
|
|
{
|
|
*replay = malloc(RTA_PAYLOAD(rta));
|
|
memcpy(*replay, RTA_DATA(rta), RTA_PAYLOAD(rta));
|
|
break;
|
|
}
|
|
if (rta->rta_type == XFRMA_REPLAY_ESN_VAL &&
|
|
RTA_PAYLOAD(rta) >= sizeof(**replay_esn) + this->replay_bmp)
|
|
{
|
|
*replay_esn = malloc(RTA_PAYLOAD(rta));
|
|
memcpy(*replay_esn, RTA_DATA(rta), RTA_PAYLOAD(rta));
|
|
break;
|
|
}
|
|
rta = RTA_NEXT(rta, rtasize);
|
|
}
|
|
}
|
|
free(out);
|
|
}
|
|
|
|
METHOD(kernel_ipsec_t, query_sa, status_t,
|
|
private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst,
|
|
u_int32_t spi, u_int8_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;
|
|
status_t status = FAILED;
|
|
size_t len;
|
|
|
|
memset(&request, 0, sizeof(request));
|
|
|
|
DBG2(DBG_KNL, "querying SAD entry with SPI %.8x (mark %u/0x%08x)",
|
|
ntohl(spi), mark.value, mark.mask);
|
|
|
|
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 = 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 += RTA_ALIGN(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%08x) 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));
|
|
}
|
|
else
|
|
{
|
|
*bytes = sa->curlft.bytes;
|
|
status = SUCCESS;
|
|
}
|
|
memwipe(out, len);
|
|
free(out);
|
|
return status;
|
|
}
|
|
|
|
METHOD(kernel_ipsec_t, del_sa, status_t,
|
|
private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst,
|
|
u_int32_t spi, u_int8_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));
|
|
|
|
DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x (mark %u/0x%08x)",
|
|
ntohl(spi), mark.value, mark.mask);
|
|
|
|
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 = 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 += RTA_ALIGN(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;
|
|
}
|
|
|
|
switch (this->socket_xfrm->send_ack(this->socket_xfrm, hdr))
|
|
{
|
|
case SUCCESS:
|
|
DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x (mark %u/0x%08x)",
|
|
ntohl(spi), mark.value, mark.mask);
|
|
return SUCCESS;
|
|
case NOT_FOUND:
|
|
return NOT_FOUND;
|
|
default:
|
|
if (mark.value)
|
|
{
|
|
DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x "
|
|
"(mark %u/0x%08x)", ntohl(spi), mark.value, mark.mask);
|
|
}
|
|
else
|
|
{
|
|
DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x",
|
|
ntohl(spi));
|
|
}
|
|
return FAILED;
|
|
}
|
|
}
|
|
|
|
METHOD(kernel_ipsec_t, update_sa, status_t,
|
|
private_kernel_netlink_ipsec_t *this, u_int32_t spi, u_int8_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;
|
|
struct xfrm_replay_state *replay = NULL;
|
|
struct xfrm_replay_state_esn *replay_esn = NULL;
|
|
status_t status = FAILED;
|
|
|
|
/* 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 = 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));
|
|
goto failed;
|
|
}
|
|
|
|
get_replay_state(this, spi, protocol, dst, &replay_esn, &replay);
|
|
|
|
/* 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));
|
|
goto 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_ALIGN(rta->rta_len);
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
goto 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 (replay_esn)
|
|
{
|
|
rta->rta_type = XFRMA_REPLAY_ESN_VAL;
|
|
rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_replay_state_esn) +
|
|
this->replay_bmp);
|
|
|
|
hdr->nlmsg_len += RTA_ALIGN(rta->rta_len);
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
goto failed;
|
|
}
|
|
memcpy(RTA_DATA(rta), replay_esn,
|
|
sizeof(struct xfrm_replay_state_esn) + this->replay_bmp);
|
|
|
|
rta = XFRM_RTA_NEXT(rta);
|
|
}
|
|
else if (replay)
|
|
{
|
|
rta->rta_type = XFRMA_REPLAY_VAL;
|
|
rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_replay_state));
|
|
|
|
hdr->nlmsg_len += RTA_ALIGN(rta->rta_len);
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
goto failed;
|
|
}
|
|
memcpy(RTA_DATA(rta), replay, sizeof(replay));
|
|
|
|
rta = XFRM_RTA_NEXT(rta);
|
|
}
|
|
else
|
|
{
|
|
DBG1(DBG_KNL, "unable to copy replay state from old SAD entry "
|
|
"with SPI %.8x", ntohl(spi));
|
|
}
|
|
|
|
if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
|
|
{
|
|
DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi));
|
|
goto failed;
|
|
}
|
|
|
|
status = SUCCESS;
|
|
failed:
|
|
free(replay);
|
|
free(replay_esn);
|
|
memwipe(out, len);
|
|
memwipe(request, sizeof(request));
|
|
free(out);
|
|
|
|
return status;
|
|
}
|
|
|
|
METHOD(kernel_ipsec_t, flush_sas, status_t,
|
|
private_kernel_netlink_ipsec_t *this)
|
|
{
|
|
netlink_buf_t request;
|
|
struct nlmsghdr *hdr;
|
|
struct xfrm_usersa_flush *flush;
|
|
|
|
memset(&request, 0, sizeof(request));
|
|
|
|
DBG2(DBG_KNL, "flushing all SAD entries");
|
|
|
|
hdr = (struct nlmsghdr*)request;
|
|
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
|
|
hdr->nlmsg_type = XFRM_MSG_FLUSHSA;
|
|
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
|
|
|
|
flush = (struct xfrm_usersa_flush*)NLMSG_DATA(hdr);
|
|
flush->proto = IPSEC_PROTO_ANY;
|
|
|
|
if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
|
|
{
|
|
DBG1(DBG_KNL, "unable to flush SAD entries");
|
|
return FAILED;
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* Add or update a policy in the kernel.
|
|
*
|
|
* Note: The mutex has to be locked when entering this function
|
|
* and is unlocked here in any case.
|
|
*/
|
|
static status_t add_policy_internal(private_kernel_netlink_ipsec_t *this,
|
|
policy_entry_t *policy, policy_sa_t *mapping, bool update)
|
|
{
|
|
netlink_buf_t request;
|
|
policy_entry_t clone;
|
|
ipsec_sa_t *ipsec = mapping->sa;
|
|
struct xfrm_userpolicy_info *policy_info;
|
|
struct nlmsghdr *hdr;
|
|
int i;
|
|
|
|
/* clone the policy so we are able to check it out again later */
|
|
memcpy(&clone, policy, sizeof(policy_entry_t));
|
|
|
|
memset(&request, 0, sizeof(request));
|
|
hdr = (struct nlmsghdr*)request;
|
|
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
|
|
hdr->nlmsg_type = update ? 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 selector size, small size = high prio */
|
|
policy_info->priority = mapping->priority;
|
|
policy_info->action = mapping->type != POLICY_DROP ? XFRM_POLICY_ALLOW
|
|
: XFRM_POLICY_BLOCK;
|
|
policy_info->share = XFRM_SHARE_ANY;
|
|
|
|
/* 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);
|
|
|
|
if (mapping->type == POLICY_IPSEC)
|
|
{
|
|
struct xfrm_user_tmpl *tmpl = (struct xfrm_user_tmpl*)RTA_DATA(rthdr);
|
|
struct {
|
|
u_int8_t proto;
|
|
bool use;
|
|
} protos[] = {
|
|
{ IPPROTO_COMP, ipsec->cfg.ipcomp.transform != IPCOMP_NONE },
|
|
{ IPPROTO_ESP, ipsec->cfg.esp.use },
|
|
{ IPPROTO_AH, ipsec->cfg.ah.use },
|
|
};
|
|
ipsec_mode_t proto_mode = ipsec->cfg.mode;
|
|
|
|
rthdr->rta_type = XFRMA_TMPL;
|
|
rthdr->rta_len = 0; /* actual length is set below */
|
|
|
|
for (i = 0; i < countof(protos); i++)
|
|
{
|
|
if (!protos[i].use)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
rthdr->rta_len += RTA_LENGTH(sizeof(struct xfrm_user_tmpl));
|
|
hdr->nlmsg_len += RTA_ALIGN(RTA_LENGTH(sizeof(struct xfrm_user_tmpl)));
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
this->mutex->unlock(this->mutex);
|
|
return FAILED;
|
|
}
|
|
|
|
tmpl->reqid = ipsec->cfg.reqid;
|
|
tmpl->id.proto = protos[i].proto;
|
|
tmpl->aalgos = tmpl->ealgos = tmpl->calgos = ~0;
|
|
tmpl->mode = mode2kernel(proto_mode);
|
|
tmpl->optional = protos[i].proto == IPPROTO_COMP &&
|
|
policy->direction != POLICY_OUT;
|
|
tmpl->family = ipsec->src->get_family(ipsec->src);
|
|
|
|
if (proto_mode == MODE_TUNNEL)
|
|
{ /* only for tunnel mode */
|
|
host2xfrm(ipsec->src, &tmpl->saddr);
|
|
host2xfrm(ipsec->dst, &tmpl->id.daddr);
|
|
}
|
|
|
|
tmpl++;
|
|
|
|
/* use transport mode for other SAs */
|
|
proto_mode = MODE_TRANSPORT;
|
|
}
|
|
|
|
rthdr = XFRM_RTA_NEXT(rthdr);
|
|
}
|
|
|
|
if (ipsec->mark.value)
|
|
{
|
|
struct xfrm_mark *mrk;
|
|
|
|
rthdr->rta_type = XFRMA_MARK;
|
|
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark));
|
|
|
|
hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
this->mutex->unlock(this->mutex);
|
|
return FAILED;
|
|
}
|
|
|
|
mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
|
|
mrk->v = ipsec->mark.value;
|
|
mrk->m = ipsec->mark.mask;
|
|
}
|
|
this->mutex->unlock(this->mutex);
|
|
|
|
if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
|
|
{
|
|
return FAILED;
|
|
}
|
|
|
|
/* find the policy again */
|
|
this->mutex->lock(this->mutex);
|
|
policy = this->policies->get(this->policies, &clone);
|
|
if (!policy ||
|
|
policy->used_by->find_first(policy->used_by,
|
|
NULL, (void**)&mapping) != SUCCESS)
|
|
{ /* policy or mapping is already gone, ignore */
|
|
this->mutex->unlock(this->mutex);
|
|
return SUCCESS;
|
|
}
|
|
|
|
/* install a route, if:
|
|
* - 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->direction == POLICY_FWD &&
|
|
ipsec->cfg.mode != MODE_TRANSPORT && this->install_routes)
|
|
{
|
|
route_entry_t *route = malloc_thing(route_entry_t);
|
|
policy_sa_fwd_t *fwd = (policy_sa_fwd_t*)mapping;
|
|
|
|
if (hydra->kernel_interface->get_address_by_ts(hydra->kernel_interface,
|
|
fwd->dst_ts, &route->src_ip) == SUCCESS)
|
|
{
|
|
/* get the nexthop to src (src as we are in POLICY_FWD) */
|
|
route->gateway = hydra->kernel_interface->get_nexthop(
|
|
hydra->kernel_interface, ipsec->src);
|
|
/* install route via outgoing interface */
|
|
route->if_name = hydra->kernel_interface->get_interface(
|
|
hydra->kernel_interface, ipsec->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)
|
|
{
|
|
this->mutex->unlock(this->mutex);
|
|
route_entry_destroy(route);
|
|
return SUCCESS;
|
|
}
|
|
|
|
if (policy->route)
|
|
{
|
|
route_entry_t *old = policy->route;
|
|
if (route_entry_equals(old, route))
|
|
{
|
|
this->mutex->unlock(this->mutex);
|
|
route_entry_destroy(route);
|
|
return SUCCESS;
|
|
}
|
|
/* uninstall previously installed route */
|
|
if (hydra->kernel_interface->del_route(hydra->kernel_interface,
|
|
old->dst_net, old->prefixlen, old->gateway,
|
|
old->src_ip, old->if_name) != SUCCESS)
|
|
{
|
|
DBG1(DBG_KNL, "error uninstalling route installed with "
|
|
"policy %R === %R %N", fwd->src_ts,
|
|
fwd->dst_ts, policy_dir_names,
|
|
policy->direction);
|
|
}
|
|
route_entry_destroy(old);
|
|
policy->route = NULL;
|
|
}
|
|
|
|
DBG2(DBG_KNL, "installing route: %R via %H src %H dev %s",
|
|
fwd->src_ts, route->gateway, route->src_ip, route->if_name);
|
|
switch (hydra->kernel_interface->add_route(
|
|
hydra->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
|
|
{
|
|
free(route);
|
|
}
|
|
}
|
|
this->mutex->unlock(this->mutex);
|
|
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, policy_type_t type, ipsec_sa_cfg_t *sa,
|
|
mark_t mark, policy_priority_t priority)
|
|
{
|
|
policy_entry_t *policy, *current;
|
|
policy_sa_t *assigned_sa, *current_sa;
|
|
enumerator_t *enumerator;
|
|
bool found = FALSE, update = TRUE;
|
|
|
|
/* create a policy */
|
|
INIT(policy,
|
|
.sel = ts2selector(src_ts, dst_ts),
|
|
.mark = mark.value & mark.mask,
|
|
.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 */
|
|
DBG2(DBG_KNL, "policy %R === %R %N (mark %u/0x%08x) "
|
|
"already exists, increasing refcount",
|
|
src_ts, dst_ts, policy_dir_names, direction,
|
|
mark.value, mark.mask);
|
|
policy_entry_destroy(this, policy);
|
|
policy = current;
|
|
found = TRUE;
|
|
}
|
|
else
|
|
{ /* use the new one, if we have no such policy */
|
|
policy->used_by = linked_list_create();
|
|
this->policies->put(this->policies, policy, policy);
|
|
}
|
|
|
|
/* cache the assigned IPsec SA */
|
|
assigned_sa = policy_sa_create(this, direction, type, src, dst, src_ts,
|
|
dst_ts, mark, sa);
|
|
assigned_sa->priority = get_priority(policy, priority);
|
|
|
|
if (this->policy_history)
|
|
{ /* insert the SA according to its priority */
|
|
enumerator = policy->used_by->create_enumerator(policy->used_by);
|
|
while (enumerator->enumerate(enumerator, (void**)¤t_sa))
|
|
{
|
|
if (current_sa->priority >= assigned_sa->priority)
|
|
{
|
|
break;
|
|
}
|
|
update = FALSE;
|
|
}
|
|
policy->used_by->insert_before(policy->used_by, enumerator,
|
|
assigned_sa);
|
|
enumerator->destroy(enumerator);
|
|
}
|
|
else
|
|
{ /* simply insert it last and only update if it is not installed yet */
|
|
policy->used_by->insert_last(policy->used_by, assigned_sa);
|
|
update = !found;
|
|
}
|
|
|
|
if (!update)
|
|
{ /* we don't update the policy if the priority is lower than that of
|
|
* the currently installed one */
|
|
this->mutex->unlock(this->mutex);
|
|
return SUCCESS;
|
|
}
|
|
|
|
DBG2(DBG_KNL, "%s policy %R === %R %N (mark %u/0x%08x)",
|
|
found ? "updating" : "adding", src_ts, dst_ts,
|
|
policy_dir_names, direction, mark.value, mark.mask);
|
|
|
|
if (add_policy_internal(this, policy, assigned_sa, found) != SUCCESS)
|
|
{
|
|
DBG1(DBG_KNL, "unable to %s policy %R === %R %N",
|
|
found ? "update" : "add", src_ts, dst_ts,
|
|
policy_dir_names, direction);
|
|
return FAILED;
|
|
}
|
|
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));
|
|
|
|
DBG2(DBG_KNL, "querying policy %R === %R %N (mark %u/0x%08x)",
|
|
src_ts, dst_ts, policy_dir_names, direction,
|
|
mark.value, mark.mask);
|
|
|
|
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 += RTA_ALIGN(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, u_int32_t reqid,
|
|
mark_t mark, policy_priority_t prio)
|
|
{
|
|
policy_entry_t *current, policy;
|
|
enumerator_t *enumerator;
|
|
policy_sa_t *mapping;
|
|
netlink_buf_t request;
|
|
struct nlmsghdr *hdr;
|
|
struct xfrm_userpolicy_id *policy_id;
|
|
bool is_installed = TRUE;
|
|
u_int32_t priority;
|
|
|
|
DBG2(DBG_KNL, "deleting policy %R === %R %N (mark %u/0x%08x)",
|
|
src_ts, dst_ts, policy_dir_names, direction,
|
|
mark.value, mark.mask);
|
|
|
|
/* 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)
|
|
{
|
|
if (mark.value)
|
|
{
|
|
DBG1(DBG_KNL, "deleting policy %R === %R %N (mark %u/0x%08x) "
|
|
"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);
|
|
}
|
|
this->mutex->unlock(this->mutex);
|
|
return NOT_FOUND;
|
|
}
|
|
|
|
if (this->policy_history)
|
|
{ /* remove mapping to SA by reqid and priority */
|
|
priority = get_priority(current, prio);
|
|
enumerator = current->used_by->create_enumerator(current->used_by);
|
|
while (enumerator->enumerate(enumerator, (void**)&mapping))
|
|
{
|
|
if (reqid == mapping->sa->cfg.reqid &&
|
|
priority == mapping->priority)
|
|
{
|
|
current->used_by->remove_at(current->used_by, enumerator);
|
|
policy_sa_destroy(mapping, &direction, this);
|
|
break;
|
|
}
|
|
is_installed = FALSE;
|
|
}
|
|
enumerator->destroy(enumerator);
|
|
}
|
|
else
|
|
{ /* remove one of the SAs but don't update the policy */
|
|
current->used_by->remove_last(current->used_by, (void**)&mapping);
|
|
policy_sa_destroy(mapping, &direction, this);
|
|
is_installed = FALSE;
|
|
}
|
|
|
|
if (current->used_by->get_count(current->used_by) > 0)
|
|
{ /* policy is used by more SAs, keep in kernel */
|
|
DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed");
|
|
if (!is_installed)
|
|
{ /* no need to update as the policy was not installed for this SA */
|
|
this->mutex->unlock(this->mutex);
|
|
return SUCCESS;
|
|
}
|
|
|
|
DBG2(DBG_KNL, "updating policy %R === %R %N (mark %u/0x%08x)",
|
|
src_ts, dst_ts, policy_dir_names, direction,
|
|
mark.value, mark.mask);
|
|
|
|
current->used_by->get_first(current->used_by, (void**)&mapping);
|
|
if (add_policy_internal(this, current, mapping, TRUE) != SUCCESS)
|
|
{
|
|
DBG1(DBG_KNL, "unable to update policy %R === %R %N",
|
|
src_ts, dst_ts, policy_dir_names, direction);
|
|
return FAILED;
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
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 = current->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 += RTA_ALIGN(rthdr->rta_len);
|
|
if (hdr->nlmsg_len > sizeof(request))
|
|
{
|
|
this->mutex->unlock(this->mutex);
|
|
return FAILED;
|
|
}
|
|
|
|
mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
|
|
mrk->v = mark.value;
|
|
mrk->m = mark.mask;
|
|
}
|
|
|
|
if (current->route)
|
|
{
|
|
route_entry_t *route = current->route;
|
|
if (hydra->kernel_interface->del_route(hydra->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);
|
|
}
|
|
}
|
|
|
|
this->policies->remove(this->policies, current);
|
|
policy_entry_destroy(this, current);
|
|
this->mutex->unlock(this->mutex);
|
|
|
|
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%08x)", 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;
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
METHOD(kernel_ipsec_t, flush_policies, status_t,
|
|
private_kernel_netlink_ipsec_t *this)
|
|
{
|
|
netlink_buf_t request;
|
|
struct nlmsghdr *hdr;
|
|
|
|
memset(&request, 0, sizeof(request));
|
|
|
|
DBG2(DBG_KNL, "flushing all policies from SPD");
|
|
|
|
hdr = (struct nlmsghdr*)request;
|
|
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
|
|
hdr->nlmsg_type = XFRM_MSG_FLUSHPOLICY;
|
|
hdr->nlmsg_len = NLMSG_LENGTH(0); /* no data associated */
|
|
|
|
/* by adding an rtattr of type XFRMA_POLICY_TYPE we could restrict this
|
|
* to main or sub policies (default is main) */
|
|
|
|
if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
|
|
{
|
|
DBG1(DBG_KNL, "unable to flush SPD entries");
|
|
return FAILED;
|
|
}
|
|
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, enable_udp_decap, bool,
|
|
private_kernel_netlink_ipsec_t *this, int fd, int family, u_int16_t port)
|
|
{
|
|
int type = UDP_ENCAP_ESPINUDP;
|
|
|
|
if (setsockopt(fd, SOL_UDP, UDP_ENCAP, &type, sizeof(type)) < 0)
|
|
{
|
|
DBG1(DBG_KNL, "unable to set UDP_ENCAP: %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->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))
|
|
{
|
|
policy_entry_destroy(this, policy);
|
|
}
|
|
enumerator->destroy(enumerator);
|
|
this->policies->destroy(this->policies);
|
|
this->sas->destroy(this->sas);
|
|
this->mutex->destroy(this->mutex);
|
|
free(this);
|
|
}
|
|
|
|
/*
|
|
* Described in header.
|
|
*/
|
|
kernel_netlink_ipsec_t *kernel_netlink_ipsec_create()
|
|
{
|
|
private_kernel_netlink_ipsec_t *this;
|
|
bool register_for_events = TRUE;
|
|
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,
|
|
.flush_sas = _flush_sas,
|
|
.add_policy = _add_policy,
|
|
.query_policy = _query_policy,
|
|
.del_policy = _del_policy,
|
|
.flush_policies = _flush_policies,
|
|
.bypass_socket = _bypass_socket,
|
|
.enable_udp_decap = _enable_udp_decap,
|
|
.destroy = _destroy,
|
|
},
|
|
},
|
|
.policies = hashtable_create((hashtable_hash_t)policy_hash,
|
|
(hashtable_equals_t)policy_equals, 32),
|
|
.sas = hashtable_create((hashtable_hash_t)ipsec_sa_hash,
|
|
(hashtable_equals_t)ipsec_sa_equals, 32),
|
|
.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
|
|
.policy_history = TRUE,
|
|
.install_routes = lib->settings->get_bool(lib->settings,
|
|
"%s.install_routes", TRUE, hydra->daemon),
|
|
.replay_window = lib->settings->get_int(lib->settings,
|
|
"%s.replay_window", DEFAULT_REPLAY_WINDOW, hydra->daemon),
|
|
);
|
|
|
|
this->replay_bmp = (this->replay_window + sizeof(u_int32_t) * 8 - 1) /
|
|
(sizeof(u_int32_t) * 8);
|
|
|
|
if (streq(hydra->daemon, "pluto"))
|
|
{ /* no routes for pluto, they are installed via updown script */
|
|
this->install_routes = FALSE;
|
|
/* no policy history for pluto */
|
|
this->policy_history = FALSE;
|
|
}
|
|
else if (streq(hydra->daemon, "starter"))
|
|
{ /* starter has no threads, so we do not register for kernel events */
|
|
register_for_events = FALSE;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
if (register_for_events)
|
|
{
|
|
struct sockaddr_nl addr;
|
|
|
|
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;
|
|
}
|
|
lib->processor->queue_job(lib->processor,
|
|
(job_t*)callback_job_create_with_prio(
|
|
(callback_job_cb_t)receive_events, this, NULL,
|
|
(callback_job_cancel_t)return_false, JOB_PRIO_CRITICAL));
|
|
}
|
|
|
|
return &this->public;
|
|
}
|
|
|