diff options
Diffstat (limited to 'src/libcharon/plugins/kernel_pfkey/kernel_pfkey_ipsec.c')
| -rw-r--r-- | src/libcharon/plugins/kernel_pfkey/kernel_pfkey_ipsec.c | 2175 |
1 files changed, 2175 insertions, 0 deletions
diff --git a/src/libcharon/plugins/kernel_pfkey/kernel_pfkey_ipsec.c b/src/libcharon/plugins/kernel_pfkey/kernel_pfkey_ipsec.c new file mode 100644 index 000000000..8a7883c8a --- /dev/null +++ b/src/libcharon/plugins/kernel_pfkey/kernel_pfkey_ipsec.c @@ -0,0 +1,2175 @@ +/* + * Copyright (C) 2008-2009 Tobias Brunner + * Copyright (C) 2008 Andreas Steffen + * Hochschule fuer Technik Rapperswil + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + */ + +#include <sys/types.h> +#include <sys/socket.h> + +#ifdef __FreeBSD__ +#include <limits.h> /* for LONG_MAX */ +#endif + +#ifdef HAVE_NET_PFKEYV2_H +#include <net/pfkeyv2.h> +#else +#include <stdint.h> +#include <linux/pfkeyv2.h> +#endif + +#ifdef SADB_X_EXT_NAT_T_TYPE +#define HAVE_NATT +#endif + +#ifdef HAVE_NETIPSEC_IPSEC_H +#include <netipsec/ipsec.h> +#elif defined(HAVE_NETINET6_IPSEC_H) +#include <netinet6/ipsec.h> +#else +#include <linux/ipsec.h> +#endif + +#ifdef HAVE_NATT +#ifdef HAVE_LINUX_UDP_H +#include <linux/udp.h> +#else +#include <netinet/udp.h> +#endif /*HAVE_LINUX_UDP_H*/ +#endif /*HAVE_NATT*/ + +#include <unistd.h> +#include <time.h> +#include <errno.h> + +#include "kernel_pfkey_ipsec.h" + +#include <daemon.h> +#include <utils/host.h> +#include <threading/thread.h> +#include <threading/mutex.h> +#include <processing/jobs/callback_job.h> +#include <processing/jobs/acquire_job.h> +#include <processing/jobs/migrate_job.h> +#include <processing/jobs/rekey_child_sa_job.h> +#include <processing/jobs/delete_child_sa_job.h> +#include <processing/jobs/update_sa_job.h> + +/** non linux specific */ +#ifndef IPPROTO_COMP +#define IPPROTO_COMP IPPROTO_IPCOMP +#endif + +#ifndef SADB_X_AALG_SHA2_256HMAC +#define SADB_X_AALG_SHA2_256HMAC SADB_X_AALG_SHA2_256 +#define SADB_X_AALG_SHA2_384HMAC SADB_X_AALG_SHA2_384 +#define SADB_X_AALG_SHA2_512HMAC SADB_X_AALG_SHA2_512 +#endif + +#ifndef SADB_X_EALG_AESCBC +#define SADB_X_EALG_AESCBC SADB_X_EALG_AES +#endif + +#ifndef SADB_X_EALG_CASTCBC +#define SADB_X_EALG_CASTCBC SADB_X_EALG_CAST128CBC +#endif + +#ifndef SOL_IP +#define SOL_IP IPPROTO_IP +#define SOL_IPV6 IPPROTO_IPV6 +#endif + +/** from linux/in.h */ +#ifndef IP_IPSEC_POLICY +#define IP_IPSEC_POLICY 16 +#endif + +/** missing on uclibc */ +#ifndef IPV6_IPSEC_POLICY +#define IPV6_IPSEC_POLICY 34 +#endif + +/** default priority of installed policies */ +#define PRIO_LOW 3000 +#define PRIO_HIGH 2000 + +#ifdef __APPLE__ +/** from xnu/bsd/net/pfkeyv2.h */ +#define SADB_X_EXT_NATT 0x002 + struct sadb_sa_2 { + struct sadb_sa sa; + u_int16_t sadb_sa_natt_port; + u_int16_t sadb_reserved0; + u_int32_t sadb_reserved1; + }; +#endif + +/** buffer size for PF_KEY messages */ +#define PFKEY_BUFFER_SIZE 4096 + +/** PF_KEY messages are 64 bit aligned */ +#define PFKEY_ALIGNMENT 8 +/** aligns len to 64 bits */ +#define PFKEY_ALIGN(len) (((len) + PFKEY_ALIGNMENT - 1) & ~(PFKEY_ALIGNMENT - 1)) +/** calculates the properly padded length in 64 bit chunks */ +#define PFKEY_LEN(len) ((PFKEY_ALIGN(len) / PFKEY_ALIGNMENT)) +/** calculates user mode length i.e. in bytes */ +#define PFKEY_USER_LEN(len) ((len) * PFKEY_ALIGNMENT) + +/** given a PF_KEY message header and an extension this updates the length in the header */ +#define PFKEY_EXT_ADD(msg, ext) ((msg)->sadb_msg_len += ((struct sadb_ext*)ext)->sadb_ext_len) +/** given a PF_KEY message header this returns a pointer to the next extension */ +#define PFKEY_EXT_ADD_NEXT(msg) ((struct sadb_ext*)(((char*)(msg)) + PFKEY_USER_LEN((msg)->sadb_msg_len))) +/** copy an extension and append it to a PF_KEY message */ +#define PFKEY_EXT_COPY(msg, ext) (PFKEY_EXT_ADD(msg, memcpy(PFKEY_EXT_ADD_NEXT(msg), ext, PFKEY_USER_LEN(((struct sadb_ext*)ext)->sadb_ext_len)))) +/** given a PF_KEY extension this returns a pointer to the next extension */ +#define PFKEY_EXT_NEXT(ext) ((struct sadb_ext*)(((char*)(ext)) + PFKEY_USER_LEN(((struct sadb_ext*)ext)->sadb_ext_len))) +/** given a PF_KEY extension this returns a pointer to the next extension also updates len (len in 64 bit words) */ +#define PFKEY_EXT_NEXT_LEN(ext,len) ((len) -= (ext)->sadb_ext_len, PFKEY_EXT_NEXT(ext)) +/** true if ext has a valid length and len is large enough to contain ext (assuming len in 64 bit words) */ +#define PFKEY_EXT_OK(ext,len) ((len) >= PFKEY_LEN(sizeof(struct sadb_ext)) && \ + (ext)->sadb_ext_len >= PFKEY_LEN(sizeof(struct sadb_ext)) && \ + (ext)->sadb_ext_len <= (len)) + +typedef struct private_kernel_pfkey_ipsec_t private_kernel_pfkey_ipsec_t; + +/** + * Private variables and functions of kernel_pfkey class. + */ +struct private_kernel_pfkey_ipsec_t +{ + /** + * Public part of the kernel_pfkey_t object. + */ + kernel_pfkey_ipsec_t public; + + /** + * mutex to lock access to various lists + */ + mutex_t *mutex; + + /** + * List of installed policies (policy_entry_t) + */ + linked_list_t *policies; + + /** + * whether to install routes along policies + */ + bool install_routes; + + /** + * job receiving PF_KEY events + */ + callback_job_t *job; + + /** + * mutex to lock access to the PF_KEY socket + */ + mutex_t *mutex_pfkey; + + /** + * PF_KEY socket to communicate with the kernel + */ + int socket; + + /** + * PF_KEY socket to receive acquire and expire events + */ + int socket_events; + + /** + * sequence number for messages sent to the kernel + */ + int seq; +}; + +typedef struct route_entry_t route_entry_t; + +/** + * installed routing entry + */ +struct route_entry_t { + /** Name of the interface the route is bound to */ + char *if_name; + + /** Source ip of the route */ + host_t *src_ip; + + /** gateway for this route */ + host_t *gateway; + + /** Destination net */ + chunk_t dst_net; + + /** Destination net prefixlen */ + u_int8_t prefixlen; +}; + +/** + * destroy an route_entry_t object + */ +static void route_entry_destroy(route_entry_t *this) +{ + free(this->if_name); + DESTROY_IF(this->src_ip); + DESTROY_IF(this->gateway); + chunk_free(&this->dst_net); + free(this); +} + +typedef struct policy_entry_t policy_entry_t; + +/** + * installed kernel policy. + */ +struct policy_entry_t { + + /** reqid of this policy */ + u_int32_t reqid; + + /** index assigned by the kernel */ + u_int32_t index; + + /** direction of this policy: in, out, forward */ + u_int8_t direction; + + /** parameters of installed policy */ + struct { + /** subnet and port */ + host_t *net; + /** subnet mask */ + u_int8_t mask; + /** protocol */ + u_int8_t proto; + } src, dst; + + /** associated route installed for this policy */ + route_entry_t *route; + + /** by how many CHILD_SA's this policy is used */ + u_int refcount; +}; + +/** + * create a policy_entry_t object + */ +static policy_entry_t *create_policy_entry(traffic_selector_t *src_ts, + traffic_selector_t *dst_ts, policy_dir_t dir, u_int32_t reqid) +{ + policy_entry_t *policy = malloc_thing(policy_entry_t); + policy->reqid = reqid; + policy->index = 0; + policy->direction = dir; + policy->route = NULL; + policy->refcount = 0; + + src_ts->to_subnet(src_ts, &policy->src.net, &policy->src.mask); + dst_ts->to_subnet(dst_ts, &policy->dst.net, &policy->dst.mask); + + /* src or dest proto may be "any" (0), use more restrictive one */ + policy->src.proto = max(src_ts->get_protocol(src_ts), dst_ts->get_protocol(dst_ts)); + policy->src.proto = policy->src.proto ? policy->src.proto : IPSEC_PROTO_ANY; + policy->dst.proto = policy->src.proto; + + return policy; +} + +/** + * destroy a policy_entry_t object + */ +static void policy_entry_destroy(policy_entry_t *this) +{ + DESTROY_IF(this->src.net); + DESTROY_IF(this->dst.net); + if (this->route) + { + route_entry_destroy(this->route); + } + free(this); +} + +/** + * compares two policy_entry_t + */ +static inline bool policy_entry_equals(policy_entry_t *current, policy_entry_t *policy) +{ + return current->direction == policy->direction && + current->src.proto == policy->src.proto && + current->dst.proto == policy->dst.proto && + current->src.mask == policy->src.mask && + current->dst.mask == policy->dst.mask && + current->src.net->equals(current->src.net, policy->src.net) && + current->dst.net->equals(current->dst.net, policy->dst.net); +} + +/** + * compare the given kernel index with that of a policy + */ +static inline bool policy_entry_match_byindex(policy_entry_t *current, u_int32_t *index) +{ + return current->index == *index; +} + +typedef struct pfkey_msg_t pfkey_msg_t; + +struct pfkey_msg_t +{ + /** + * PF_KEY message base + */ + struct sadb_msg *msg; + + /** + * PF_KEY message extensions + */ + union { + struct sadb_ext *ext[SADB_EXT_MAX + 1]; + struct { + struct sadb_ext *reserved; /* SADB_EXT_RESERVED */ + struct sadb_sa *sa; /* SADB_EXT_SA */ + struct sadb_lifetime *lft_current; /* SADB_EXT_LIFETIME_CURRENT */ + struct sadb_lifetime *lft_hard; /* SADB_EXT_LIFETIME_HARD */ + struct sadb_lifetime *lft_soft; /* SADB_EXT_LIFETIME_SOFT */ + struct sadb_address *src; /* SADB_EXT_ADDRESS_SRC */ + struct sadb_address *dst; /* SADB_EXT_ADDRESS_DST */ + struct sadb_address *proxy; /* SADB_EXT_ADDRESS_PROXY */ + struct sadb_key *key_auth; /* SADB_EXT_KEY_AUTH */ + struct sadb_key *key_encr; /* SADB_EXT_KEY_ENCRYPT */ + struct sadb_ident *id_src; /* SADB_EXT_IDENTITY_SRC */ + struct sadb_ident *id_dst; /* SADB_EXT_IDENTITY_DST */ + struct sadb_sens *sensitivity; /* SADB_EXT_SENSITIVITY */ + struct sadb_prop *proposal; /* SADB_EXT_PROPOSAL */ + struct sadb_supported *supported_auth; /* SADB_EXT_SUPPORTED_AUTH */ + struct sadb_supported *supported_encr; /* SADB_EXT_SUPPORTED_ENCRYPT */ + struct sadb_spirange *spirange; /* SADB_EXT_SPIRANGE */ + struct sadb_x_kmprivate *x_kmprivate; /* SADB_X_EXT_KMPRIVATE */ + struct sadb_x_policy *x_policy; /* SADB_X_EXT_POLICY */ + struct sadb_x_sa2 *x_sa2; /* SADB_X_EXT_SA2 */ + struct sadb_x_nat_t_type *x_natt_type; /* SADB_X_EXT_NAT_T_TYPE */ + struct sadb_x_nat_t_port *x_natt_sport; /* SADB_X_EXT_NAT_T_SPORT */ + struct sadb_x_nat_t_port *x_natt_dport; /* SADB_X_EXT_NAT_T_DPORT */ + struct sadb_address *x_natt_oa; /* SADB_X_EXT_NAT_T_OA */ + struct sadb_x_sec_ctx *x_sec_ctx; /* SADB_X_EXT_SEC_CTX */ + struct sadb_x_kmaddress *x_kmaddress; /* SADB_X_EXT_KMADDRESS */ + } __attribute__((__packed__)); + }; +}; + +ENUM(sadb_ext_type_names, SADB_EXT_RESERVED, SADB_EXT_MAX, + "SADB_EXT_RESERVED", + "SADB_EXT_SA", + "SADB_EXT_LIFETIME_CURRENT", + "SADB_EXT_LIFETIME_HARD", + "SADB_EXT_LIFETIME_SOFT", + "SADB_EXT_ADDRESS_SRC", + "SADB_EXT_ADDRESS_DST", + "SADB_EXT_ADDRESS_PROXY", + "SADB_EXT_KEY_AUTH", + "SADB_EXT_KEY_ENCRYPT", + "SADB_EXT_IDENTITY_SRC", + "SADB_EXT_IDENTITY_DST", + "SADB_EXT_SENSITIVITY", + "SADB_EXT_PROPOSAL", + "SADB_EXT_SUPPORTED_AUTH", + "SADB_EXT_SUPPORTED_ENCRYPT", + "SADB_EXT_SPIRANGE", + "SADB_X_EXT_KMPRIVATE", + "SADB_X_EXT_POLICY", + "SADB_X_EXT_SA2", + "SADB_X_EXT_NAT_T_TYPE", + "SADB_X_EXT_NAT_T_SPORT", + "SADB_X_EXT_NAT_T_DPORT", + "SADB_X_EXT_NAT_T_OA", + "SADB_X_EXT_SEC_CTX", + "SADB_X_EXT_KMADDRESS" +); + +/** + * convert a IKEv2 specific protocol identifier to the PF_KEY sa type + */ +static u_int8_t proto_ike2satype(protocol_id_t proto) +{ + switch (proto) + { + case PROTO_ESP: + return SADB_SATYPE_ESP; + case PROTO_AH: + return SADB_SATYPE_AH; + case IPPROTO_COMP: + return SADB_X_SATYPE_IPCOMP; + default: + return proto; + } +} + +/** + * convert a PF_KEY sa type to a IKEv2 specific protocol identifier + */ +static protocol_id_t proto_satype2ike(u_int8_t proto) +{ + switch (proto) + { + case SADB_SATYPE_ESP: + return PROTO_ESP; + case SADB_SATYPE_AH: + return PROTO_AH; + case SADB_X_SATYPE_IPCOMP: + return IPPROTO_COMP; + default: + return proto; + } +} + +/** + * convert a IKEv2 specific protocol identifier to the IP protocol identifier + */ +static u_int8_t proto_ike2ip(protocol_id_t proto) +{ + switch (proto) + { + case PROTO_ESP: + return IPPROTO_ESP; + case PROTO_AH: + return IPPROTO_AH; + default: + return proto; + } +} + +/** + * convert the general ipsec mode to the one defined in ipsec.h + */ +static u_int8_t mode2kernel(ipsec_mode_t mode) +{ + switch (mode) + { + case MODE_TRANSPORT: + return IPSEC_MODE_TRANSPORT; + case MODE_TUNNEL: + return IPSEC_MODE_TUNNEL; +#ifdef HAVE_IPSEC_MODE_BEET + case MODE_BEET: + return IPSEC_MODE_BEET; +#endif + default: + return mode; + } +} + +/** + * convert the general policy direction to the one defined in ipsec.h + */ +static u_int8_t dir2kernel(policy_dir_t dir) +{ + switch (dir) + { + case POLICY_IN: + return IPSEC_DIR_INBOUND; + case POLICY_OUT: + return IPSEC_DIR_OUTBOUND; +#ifdef HAVE_IPSEC_DIR_FWD + case POLICY_FWD: + return IPSEC_DIR_FWD; +#endif + default: + return IPSEC_DIR_INVALID; + } +} + +#ifdef SADB_X_MIGRATE +/** + * convert the policy direction in ipsec.h to the general one. + */ +static policy_dir_t kernel2dir(u_int8_t dir) +{ + switch (dir) + { + case IPSEC_DIR_INBOUND: + return POLICY_IN; + case IPSEC_DIR_OUTBOUND: + return POLICY_OUT; +#ifdef HAVE_IPSEC_DIR_FWD + case IPSEC_DIR_FWD: + return POLICY_FWD; +#endif + default: + return dir; + } +} +#endif /*SADB_X_MIGRATE*/ + +typedef struct kernel_algorithm_t kernel_algorithm_t; + +/** + * Mapping of IKEv2 algorithms to PF_KEY algorithms + */ +struct kernel_algorithm_t { + /** + * Identifier specified in IKEv2 + */ + int ikev2; + + /** + * Identifier as defined in pfkeyv2.h + */ + int kernel; +}; + +#define END_OF_LIST -1 + +/** + * Algorithms for encryption + */ +static kernel_algorithm_t encryption_algs[] = { +/* {ENCR_DES_IV64, 0 }, */ + {ENCR_DES, SADB_EALG_DESCBC }, + {ENCR_3DES, SADB_EALG_3DESCBC }, +/* {ENCR_RC5, 0 }, */ +/* {ENCR_IDEA, 0 }, */ + {ENCR_CAST, SADB_X_EALG_CASTCBC }, + {ENCR_BLOWFISH, SADB_X_EALG_BLOWFISHCBC }, +/* {ENCR_3IDEA, 0 }, */ +/* {ENCR_DES_IV32, 0 }, */ + {ENCR_NULL, SADB_EALG_NULL }, + {ENCR_AES_CBC, SADB_X_EALG_AESCBC }, +/* {ENCR_AES_CTR, SADB_X_EALG_AESCTR }, */ +/* {ENCR_AES_CCM_ICV8, SADB_X_EALG_AES_CCM_ICV8 }, */ +/* {ENCR_AES_CCM_ICV12, SADB_X_EALG_AES_CCM_ICV12 }, */ +/* {ENCR_AES_CCM_ICV16, SADB_X_EALG_AES_CCM_ICV16 }, */ +/* {ENCR_AES_GCM_ICV8, SADB_X_EALG_AES_GCM_ICV8 }, */ +/* {ENCR_AES_GCM_ICV12, SADB_X_EALG_AES_GCM_ICV12 }, */ +/* {ENCR_AES_GCM_ICV16, SADB_X_EALG_AES_GCM_ICV16 }, */ + {END_OF_LIST, 0 }, +}; + +/** + * Algorithms for integrity protection + */ +static kernel_algorithm_t integrity_algs[] = { + {AUTH_HMAC_MD5_96, SADB_AALG_MD5HMAC }, + {AUTH_HMAC_SHA1_96, SADB_AALG_SHA1HMAC }, + {AUTH_HMAC_SHA2_256_128, SADB_X_AALG_SHA2_256HMAC }, + {AUTH_HMAC_SHA2_384_192, SADB_X_AALG_SHA2_384HMAC }, + {AUTH_HMAC_SHA2_512_256, SADB_X_AALG_SHA2_512HMAC }, +/* {AUTH_DES_MAC, 0, }, */ +/* {AUTH_KPDK_MD5, 0, }, */ +#ifdef SADB_X_AALG_AES_XCBC_MAC + {AUTH_AES_XCBC_96, SADB_X_AALG_AES_XCBC_MAC, }, +#endif + {END_OF_LIST, 0, }, +}; + +#if 0 +/** + * Algorithms for IPComp, unused yet + */ +static kernel_algorithm_t compression_algs[] = { +/* {IPCOMP_OUI, 0 }, */ + {IPCOMP_DEFLATE, SADB_X_CALG_DEFLATE }, + {IPCOMP_LZS, SADB_X_CALG_LZS }, + {IPCOMP_LZJH, SADB_X_CALG_LZJH }, + {END_OF_LIST, 0 }, +}; +#endif + +/** + * Look up a kernel algorithm ID and its key size + */ +static int lookup_algorithm(kernel_algorithm_t *list, int ikev2) +{ + while (list->ikev2 != END_OF_LIST) + { + if (ikev2 == list->ikev2) + { + return list->kernel; + } + list++; + } + return 0; +} + +/** + * add a host behind a sadb_address extension + */ +static void host2ext(host_t *host, struct sadb_address *ext) +{ + sockaddr_t *host_addr = host->get_sockaddr(host); + socklen_t *len = host->get_sockaddr_len(host); +#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN + host_addr->sa_len = *len; +#endif + memcpy((char*)(ext + 1), host_addr, *len); + ext->sadb_address_len = PFKEY_LEN(sizeof(*ext) + *len); +} + +/** + * add a host to the given sadb_msg + */ +static void add_addr_ext(struct sadb_msg *msg, host_t *host, u_int16_t type, + u_int8_t proto, u_int8_t prefixlen) +{ + struct sadb_address *addr = (struct sadb_address*)PFKEY_EXT_ADD_NEXT(msg); + addr->sadb_address_exttype = type; + addr->sadb_address_proto = proto; + addr->sadb_address_prefixlen = prefixlen; + host2ext(host, addr); + PFKEY_EXT_ADD(msg, addr); +} + +/** + * adds an empty address extension to the given sadb_msg + */ +static void add_anyaddr_ext(struct sadb_msg *msg, int family, u_int8_t type) +{ + socklen_t len = (family == AF_INET) ? sizeof(struct sockaddr_in) : + sizeof(struct sockaddr_in6); + struct sadb_address *addr = (struct sadb_address*)PFKEY_EXT_ADD_NEXT(msg); + addr->sadb_address_exttype = type; + sockaddr_t *saddr = (sockaddr_t*)(addr + 1); + saddr->sa_family = family; +#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN + saddr->sa_len = len; +#endif + addr->sadb_address_len = PFKEY_LEN(sizeof(*addr) + len); + PFKEY_EXT_ADD(msg, addr); +} + +#ifdef HAVE_NATT +/** + * add udp encap extensions to a sadb_msg + */ +static void add_encap_ext(struct sadb_msg *msg, host_t *src, host_t *dst) +{ + struct sadb_x_nat_t_type* nat_type; + struct sadb_x_nat_t_port* nat_port; + + nat_type = (struct sadb_x_nat_t_type*)PFKEY_EXT_ADD_NEXT(msg); + nat_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; + nat_type->sadb_x_nat_t_type_len = PFKEY_LEN(sizeof(struct sadb_x_nat_t_type)); + nat_type->sadb_x_nat_t_type_type = UDP_ENCAP_ESPINUDP; + PFKEY_EXT_ADD(msg, nat_type); + + nat_port = (struct sadb_x_nat_t_port*)PFKEY_EXT_ADD_NEXT(msg); + nat_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; + nat_port->sadb_x_nat_t_port_len = PFKEY_LEN(sizeof(struct sadb_x_nat_t_port)); + nat_port->sadb_x_nat_t_port_port = htons(src->get_port(src)); + PFKEY_EXT_ADD(msg, nat_port); + + nat_port = (struct sadb_x_nat_t_port*)PFKEY_EXT_ADD_NEXT(msg); + nat_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; + nat_port->sadb_x_nat_t_port_len = PFKEY_LEN(sizeof(struct sadb_x_nat_t_port)); + nat_port->sadb_x_nat_t_port_port = htons(dst->get_port(dst)); + PFKEY_EXT_ADD(msg, nat_port); +} +#endif /*HAVE_NATT*/ + +/** + * Convert a sadb_address to a traffic_selector + */ +static traffic_selector_t* sadb_address2ts(struct sadb_address *address) +{ + traffic_selector_t *ts; + host_t *host; + + /* The Linux 2.6 kernel does not set the protocol and port information + * in the src and dst sadb_address extensions of the SADB_ACQUIRE message. + */ + host = host_create_from_sockaddr((sockaddr_t*)&address[1]) ; + ts = traffic_selector_create_from_subnet(host, address->sadb_address_prefixlen, + address->sadb_address_proto, host->get_port(host)); + return ts; +} + +/** + * Parses a pfkey message received from the kernel + */ +static status_t parse_pfkey_message(struct sadb_msg *msg, pfkey_msg_t *out) +{ + struct sadb_ext* ext; + size_t len; + + memset(out, 0, sizeof(pfkey_msg_t)); + out->msg = msg; + + len = msg->sadb_msg_len; + len -= PFKEY_LEN(sizeof(struct sadb_msg)); + + ext = (struct sadb_ext*)(((char*)msg) + sizeof(struct sadb_msg)); + + while (len >= PFKEY_LEN(sizeof(struct sadb_ext))) + { + DBG3(DBG_KNL, " %N", sadb_ext_type_names, ext->sadb_ext_type); + if (ext->sadb_ext_len < PFKEY_LEN(sizeof(struct sadb_ext)) || + ext->sadb_ext_len > len) + { + DBG1(DBG_KNL, "length of %N extension is invalid", + sadb_ext_type_names, ext->sadb_ext_type); + break; + } + + if ((ext->sadb_ext_type > SADB_EXT_MAX) || (!ext->sadb_ext_type)) + { + DBG1(DBG_KNL, "type of PF_KEY extension (%d) is invalid", ext->sadb_ext_type); + break; + } + + if (out->ext[ext->sadb_ext_type]) + { + DBG1(DBG_KNL, "duplicate %N extension", + sadb_ext_type_names, ext->sadb_ext_type); + break; + } + + out->ext[ext->sadb_ext_type] = ext; + ext = PFKEY_EXT_NEXT_LEN(ext, len); + } + + if (len) + { + DBG1(DBG_KNL, "PF_KEY message length is invalid"); + return FAILED; + } + + return SUCCESS; +} + +/** + * Send a message to a specific PF_KEY socket and handle the response. + */ +static status_t pfkey_send_socket(private_kernel_pfkey_ipsec_t *this, int socket, + struct sadb_msg *in, struct sadb_msg **out, size_t *out_len) +{ + unsigned char buf[PFKEY_BUFFER_SIZE]; + struct sadb_msg *msg; + int in_len, len; + + this->mutex_pfkey->lock(this->mutex_pfkey); + + /* FIXME: our usage of sequence numbers is probably wrong. check RFC 2367, + * in particular the behavior in response to an SADB_ACQUIRE. */ + in->sadb_msg_seq = ++this->seq; + in->sadb_msg_pid = getpid(); + + in_len = PFKEY_USER_LEN(in->sadb_msg_len); + + while (TRUE) + { + len = send(socket, in, in_len, 0); + + if (len != in_len) + { + if (errno == EINTR) + { + /* interrupted, try again */ + continue; + } + this->mutex_pfkey->unlock(this->mutex_pfkey); + DBG1(DBG_KNL, "error sending to PF_KEY socket: %s", strerror(errno)); + return FAILED; + } + break; + } + + while (TRUE) + { + msg = (struct sadb_msg*)buf; + + len = recv(socket, buf, sizeof(buf), 0); + + if (len < 0) + { + if (errno == EINTR) + { + DBG1(DBG_KNL, "got interrupted"); + /* interrupted, try again */ + continue; + } + DBG1(DBG_KNL, "error reading from PF_KEY socket: %s", strerror(errno)); + this->mutex_pfkey->unlock(this->mutex_pfkey); + return FAILED; + } + if (len < sizeof(struct sadb_msg) || + msg->sadb_msg_len < PFKEY_LEN(sizeof(struct sadb_msg))) + { + DBG1(DBG_KNL, "received corrupted PF_KEY message"); + this->mutex_pfkey->unlock(this->mutex_pfkey); + return FAILED; + } + if (msg->sadb_msg_len > len / PFKEY_ALIGNMENT) + { + DBG1(DBG_KNL, "buffer was too small to receive the complete PF_KEY message"); + this->mutex_pfkey->unlock(this->mutex_pfkey); + return FAILED; + } + if (msg->sadb_msg_pid != in->sadb_msg_pid) + { + DBG2(DBG_KNL, "received PF_KEY message is not intended for us"); + continue; + } + if (msg->sadb_msg_seq != this->seq) + { + DBG1(DBG_KNL, "received PF_KEY message with unexpected sequence " + "number, was %d expected %d", msg->sadb_msg_seq, this->seq); + if (msg->sadb_msg_seq == 0) + { + /* FreeBSD and Mac OS X do this for the response to + * SADB_X_SPDGET (but not for the response to SADB_GET). + * FreeBSD: 'key_spdget' in /usr/src/sys/netipsec/key.c. */ + } + else if (msg->sadb_msg_seq < this->seq) + { + continue; + } + else + { + this->mutex_pfkey->unlock(this->mutex_pfkey); + return FAILED; + } + } + if (msg->sadb_msg_type != in->sadb_msg_type) + { + DBG2(DBG_KNL, "received PF_KEY message of wrong type, " + "was %d expected %d, ignoring", + msg->sadb_msg_type, in->sadb_msg_type); + } + break; + } + + *out_len = len; + *out = (struct sadb_msg*)malloc(len); + memcpy(*out, buf, len); + + this->mutex_pfkey->unlock(this->mutex_pfkey); + + return SUCCESS; +} + +/** + * Send a message to the default PF_KEY socket and handle the response. + */ +static status_t pfkey_send(private_kernel_pfkey_ipsec_t *this, + struct sadb_msg *in, struct sadb_msg **out, size_t *out_len) +{ + return pfkey_send_socket(this, this->socket, in, out, out_len); +} + +/** + * Process a SADB_ACQUIRE message from the kernel + */ +static void process_acquire(private_kernel_pfkey_ipsec_t *this, struct sadb_msg* msg) +{ + pfkey_msg_t response; + u_int32_t index, reqid = 0; + traffic_selector_t *src_ts, *dst_ts; + policy_entry_t *policy; + job_t *job; + + switch (msg->sadb_msg_satype) + { + case SADB_SATYPE_UNSPEC: + case SADB_SATYPE_ESP: + case SADB_SATYPE_AH: + break; + default: + /* acquire for AH/ESP only */ + return; + } + DBG2(DBG_KNL, "received an SADB_ACQUIRE"); + + if (parse_pfkey_message(msg, &response) != SUCCESS) + { + DBG1(DBG_KNL, "parsing SADB_ACQUIRE from kernel failed"); + return; + } + + index = response.x_policy->sadb_x_policy_id; + this->mutex->lock(this->mutex); + if (this->policies->find_first(this->policies, + (linked_list_match_t)policy_entry_match_byindex, (void**)&policy, &index) == SUCCESS) + { + reqid = policy->reqid; + } + else + { + DBG1(DBG_KNL, "received an SADB_ACQUIRE with policy id %d but no matching policy found", + index); + } + src_ts = sadb_address2ts(response.src); + dst_ts = sadb_address2ts(response.dst); + this->mutex->unlock(this->mutex); + + DBG1(DBG_KNL, "creating acquire job for policy %R === %R with reqid {%u}", + src_ts, dst_ts, reqid); + job = (job_t*)acquire_job_create(reqid, src_ts, dst_ts); + charon->processor->queue_job(charon->processor, job); +} + +/** + * Process a SADB_EXPIRE message from the kernel + */ +static void process_expire(private_kernel_pfkey_ipsec_t *this, struct sadb_msg* msg) +{ + pfkey_msg_t response; + protocol_id_t protocol; + u_int32_t spi, reqid; + bool hard; + job_t *job; + + DBG2(DBG_KNL, "received an SADB_EXPIRE"); + + if (parse_pfkey_message(msg, &response) != SUCCESS) + { + DBG1(DBG_KNL, "parsing SADB_EXPIRE from kernel failed"); + return; + } + + protocol = proto_satype2ike(msg->sadb_msg_satype); + spi = response.sa->sadb_sa_spi; + reqid = response.x_sa2->sadb_x_sa2_reqid; + hard = response.lft_hard != NULL; + + if (protocol != PROTO_ESP && protocol != PROTO_AH) + { + DBG2(DBG_KNL, "ignoring SADB_EXPIRE for SA with SPI %.8x and reqid {%u} " + "which is not a CHILD_SA", ntohl(spi), reqid); + return; + } + + DBG1(DBG_KNL, "creating %s job for %N CHILD_SA with SPI %.8x and reqid {%u}", + hard ? "delete" : "rekey", protocol_id_names, + protocol, ntohl(spi), reqid); + if (hard) + { + job = (job_t*)delete_child_sa_job_create(reqid, protocol, spi); + } + else + { + job = (job_t*)rekey_child_sa_job_create(reqid, protocol, spi); + } + charon->processor->queue_job(charon->processor, job); +} + +#ifdef SADB_X_MIGRATE +/** + * Process a SADB_X_MIGRATE message from the kernel + */ +static void process_migrate(private_kernel_pfkey_ipsec_t *this, struct sadb_msg* msg) +{ + pfkey_msg_t response; + traffic_selector_t *src_ts, *dst_ts; + policy_dir_t dir; + u_int32_t reqid = 0; + host_t *local = NULL, *remote = NULL; + job_t *job; + + DBG2(DBG_KNL, "received an SADB_X_MIGRATE"); + + if (parse_pfkey_message(msg, &response) != SUCCESS) + { + DBG1(DBG_KNL, "parsing SADB_X_MIGRATE from kernel failed"); + return; + } + src_ts = sadb_address2ts(response.src); + dst_ts = sadb_address2ts(response.dst); + dir = kernel2dir(response.x_policy->sadb_x_policy_dir); + DBG2(DBG_KNL, " policy %R === %R %N, id %u", src_ts, dst_ts, + policy_dir_names, dir); + + /* SADB_X_EXT_KMADDRESS is not present in unpatched kernels < 2.6.28 */ + if (response.x_kmaddress) + { + sockaddr_t *local_addr, *remote_addr; + u_int32_t local_len; + + local_addr = (sockaddr_t*)&response.x_kmaddress[1]; + local = host_create_from_sockaddr(local_addr); + local_len = (local_addr->sa_family == AF_INET6)? + sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in); + remote_addr = (sockaddr_t*)((u_int8_t*)local_addr + local_len); + remote = host_create_from_sockaddr(remote_addr); + DBG2(DBG_KNL, " kmaddress: %H...%H", local, remote); + } + + if (src_ts && dst_ts && local && remote) + { + DBG1(DBG_KNL, "creating migrate job for policy %R === %R %N with reqid {%u}", + src_ts, dst_ts, policy_dir_names, dir, reqid, local); + job = (job_t*)migrate_job_create(reqid, src_ts, dst_ts, dir, + local, remote); + charon->processor->queue_job(charon->processor, job); + } + else + { + DESTROY_IF(src_ts); + DESTROY_IF(dst_ts); + DESTROY_IF(local); + DESTROY_IF(remote); + } +} +#endif /*SADB_X_MIGRATE*/ + +#ifdef HAVE_NATT +/** + * Process a SADB_X_NAT_T_NEW_MAPPING message from the kernel + */ +static void process_mapping(private_kernel_pfkey_ipsec_t *this, struct sadb_msg* msg) +{ + pfkey_msg_t response; + u_int32_t spi, reqid; + host_t *host; + job_t *job; + + DBG2(DBG_KNL, "received an SADB_X_NAT_T_NEW_MAPPING"); + + if (parse_pfkey_message(msg, &response) != SUCCESS) + { + DBG1(DBG_KNL, "parsing SADB_X_NAT_T_NEW_MAPPING from kernel failed"); + return; + } + + if (!response.x_sa2) + { + DBG1(DBG_KNL, "received SADB_X_NAT_T_NEW_MAPPING is missing required information"); + return; + } + + spi = response.sa->sadb_sa_spi; + reqid = response.x_sa2->sadb_x_sa2_reqid; + + if (proto_satype2ike(msg->sadb_msg_satype) == PROTO_ESP) + { + sockaddr_t *sa = (sockaddr_t*)(response.dst + 1); + switch (sa->sa_family) + { + case AF_INET: + { + struct sockaddr_in *sin = (struct sockaddr_in*)sa; + sin->sin_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port); + } + case AF_INET6: + { + struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)sa; + sin6->sin6_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port); + } + default: + break; + } + host = host_create_from_sockaddr(sa); + if (host) + { + DBG1(DBG_KNL, "NAT mappings of ESP CHILD_SA with SPI %.8x and " + "reqid {%u} changed, queuing update job", ntohl(spi), reqid); + job = (job_t*)update_sa_job_create(reqid, host); + charon->processor->queue_job(charon->processor, job); + } + } +} +#endif /*HAVE_NATT*/ + +/** + * Receives events from kernel + */ +static job_requeue_t receive_events(private_kernel_pfkey_ipsec_t *this) +{ + unsigned char buf[PFKEY_BUFFER_SIZE]; + struct sadb_msg *msg = (struct sadb_msg*)buf; + int len; + bool oldstate; + + oldstate = thread_cancelability(TRUE); + len = recvfrom(this->socket_events, buf, sizeof(buf), 0, NULL, 0); + 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 PF_KEY event socket"); + sleep(1); + return JOB_REQUEUE_FAIR; + } + } + + if (len < sizeof(struct sadb_msg) || + msg->sadb_msg_len < PFKEY_LEN(sizeof(struct sadb_msg))) + { + DBG2(DBG_KNL, "received corrupted PF_KEY message"); + return JOB_REQUEUE_DIRECT; + } + if (msg->sadb_msg_pid != 0) + { /* not from kernel. not interested, try another one */ + return JOB_REQUEUE_DIRECT; + } + if (msg->sadb_msg_len > len / PFKEY_ALIGNMENT) + { + DBG1(DBG_KNL, "buffer was too small to receive the complete PF_KEY message"); + return JOB_REQUEUE_DIRECT; + } + + switch (msg->sadb_msg_type) + { + case SADB_ACQUIRE: + process_acquire(this, msg); + break; + case SADB_EXPIRE: + process_expire(this, msg); + break; +#ifdef SADB_X_MIGRATE + case SADB_X_MIGRATE: + process_migrate(this, msg); + break; +#endif /*SADB_X_MIGRATE*/ +#ifdef HAVE_NATT + case SADB_X_NAT_T_NEW_MAPPING: + process_mapping(this, msg); + break; +#endif /*HAVE_NATT*/ + default: + break; + } + + return JOB_REQUEUE_DIRECT; +} + +METHOD(kernel_ipsec_t, get_spi, status_t, + private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst, + protocol_id_t protocol, u_int32_t reqid, u_int32_t *spi) +{ + unsigned char request[PFKEY_BUFFER_SIZE]; + struct sadb_msg *msg, *out; + struct sadb_x_sa2 *sa2; + struct sadb_spirange *range; + pfkey_msg_t response; + u_int32_t received_spi = 0; + size_t len; + + memset(&request, 0, sizeof(request)); + + msg = (struct sadb_msg*)request; + msg->sadb_msg_version = PF_KEY_V2; + msg->sadb_msg_type = SADB_GETSPI; + msg->sadb_msg_satype = proto_ike2satype(protocol); + msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); + + sa2 = (struct sadb_x_sa2*)PFKEY_EXT_ADD_NEXT(msg); + sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; + sa2->sadb_x_sa2_len = PFKEY_LEN(sizeof(struct sadb_spirange)); + sa2->sadb_x_sa2_reqid = reqid; + PFKEY_EXT_ADD(msg, sa2); + + add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0); + add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0); + + range = (struct sadb_spirange*)PFKEY_EXT_ADD_NEXT(msg); + range->sadb_spirange_exttype = SADB_EXT_SPIRANGE; + range->sadb_spirange_len = PFKEY_LEN(sizeof(struct sadb_spirange)); + range->sadb_spirange_min = 0xc0000000; + range->sadb_spirange_max = 0xcFFFFFFF; + PFKEY_EXT_ADD(msg, range); + + if (pfkey_send(this, msg, &out, &len) == SUCCESS) + { + if (out->sadb_msg_errno) + { + DBG1(DBG_KNL, "allocating SPI failed: %s (%d)", + strerror(out->sadb_msg_errno), out->sadb_msg_errno); + } + else if (parse_pfkey_message(out, &response) == SUCCESS) + { + received_spi = response.sa->sadb_sa_spi; + } + free(out); + } + + if (received_spi == 0) + { + return FAILED; + } + + *spi = received_spi; + return SUCCESS; +} + +METHOD(kernel_ipsec_t, get_cpi, status_t, + private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst, + u_int32_t reqid, u_int16_t *cpi) +{ + return FAILED; +} + +METHOD(kernel_ipsec_t, add_sa, status_t, + private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst, u_int32_t spi, + protocol_id_t protocol, u_int32_t reqid, lifetime_cfg_t *lifetime, + u_int16_t enc_alg, chunk_t enc_key, u_int16_t int_alg, chunk_t int_key, + ipsec_mode_t mode, u_int16_t ipcomp, u_int16_t cpi, bool encap, + bool inbound, traffic_selector_t *src_ts, traffic_selector_t *dst_ts) +{ + unsigned char request[PFKEY_BUFFER_SIZE]; + struct sadb_msg *msg, *out; + struct sadb_sa *sa; + struct sadb_x_sa2 *sa2; + struct sadb_lifetime *lft; + struct sadb_key *key; + size_t len; + + memset(&request, 0, sizeof(request)); + + DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%u}", ntohl(spi), reqid); + + msg = (struct sadb_msg*)request; + msg->sadb_msg_version = PF_KEY_V2; + msg->sadb_msg_type = inbound ? SADB_UPDATE : SADB_ADD; + msg->sadb_msg_satype = proto_ike2satype(protocol); + msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); + +#ifdef __APPLE__ + if (encap) + { + struct sadb_sa_2 *sa_2; + sa_2 = (struct sadb_sa_2*)PFKEY_EXT_ADD_NEXT(msg); + sa_2->sadb_sa_natt_port = dst->get_port(dst); + sa = &sa_2->sa; + sa->sadb_sa_flags |= SADB_X_EXT_NATT; + len = sizeof(struct sadb_sa_2); + } + else +#endif + { + sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg); + len = sizeof(struct sadb_sa); + } + sa->sadb_sa_exttype = SADB_EXT_SA; + sa->sadb_sa_len = PFKEY_LEN(len); + sa->sadb_sa_spi = spi; + sa->sadb_sa_replay = (protocol == IPPROTO_COMP) ? 0 : 32; + sa->sadb_sa_auth = lookup_algorithm(integrity_algs, int_alg); + sa->sadb_sa_encrypt = lookup_algorithm(encryption_algs, enc_alg); + PFKEY_EXT_ADD(msg, sa); + + sa2 = (struct sadb_x_sa2*)PFKEY_EXT_ADD_NEXT(msg); + sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; + sa2->sadb_x_sa2_len = PFKEY_LEN(sizeof(struct sadb_spirange)); + sa2->sadb_x_sa2_mode = mode2kernel(mode); + sa2->sadb_x_sa2_reqid = reqid; + PFKEY_EXT_ADD(msg, sa2); + + add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0); + add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0); + + lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg); + lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; + lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime)); + lft->sadb_lifetime_allocations = lifetime->packets.rekey; + lft->sadb_lifetime_bytes = lifetime->bytes.rekey; + lft->sadb_lifetime_addtime = lifetime->time.rekey; + lft->sadb_lifetime_usetime = 0; /* we only use addtime */ + PFKEY_EXT_ADD(msg, lft); + + lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg); + lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; + lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime)); + lft->sadb_lifetime_allocations = lifetime->packets.life; + lft->sadb_lifetime_bytes = lifetime->bytes.life; + lft->sadb_lifetime_addtime = lifetime->time.life; + lft->sadb_lifetime_usetime = 0; /* we only use addtime */ + PFKEY_EXT_ADD(msg, lft); + + if (enc_alg != ENCR_UNDEFINED) + { + if (!sa->sadb_sa_encrypt) + { + DBG1(DBG_KNL, "algorithm %N not supported by kernel!", + encryption_algorithm_names, enc_alg); + return FAILED; + } + DBG2(DBG_KNL, " using encryption algorithm %N with key size %d", + encryption_algorithm_names, enc_alg, enc_key.len * 8); + + key = (struct sadb_key*)PFKEY_EXT_ADD_NEXT(msg); + key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; + key->sadb_key_bits = enc_key.len * 8; + key->sadb_key_len = PFKEY_LEN(sizeof(struct sadb_key) + enc_key.len); + memcpy(key + 1, enc_key.ptr, enc_key.len); + + PFKEY_EXT_ADD(msg, key); + } + + if (int_alg != AUTH_UNDEFINED) + { + if (!sa->sadb_sa_auth) + { + DBG1(DBG_KNL, "algorithm %N not supported by kernel!", + integrity_algorithm_names, int_alg); + return FAILED; + } + DBG2(DBG_KNL, " using integrity algorithm %N with key size %d", + integrity_algorithm_names, int_alg, int_key.len * 8); + + key = (struct sadb_key*)PFKEY_EXT_ADD_NEXT(msg); + key->sadb_key_exttype = SADB_EXT_KEY_AUTH; + key->sadb_key_bits = int_key.len * 8; + key->sadb_key_len = PFKEY_LEN(sizeof(struct sadb_key) + int_key.len); + memcpy(key + 1, int_key.ptr, int_key.len); + + PFKEY_EXT_ADD(msg, key); + } + + if (ipcomp != IPCOMP_NONE) + { + /*TODO*/ + } + +#ifdef HAVE_NATT + if (encap) + { + add_encap_ext(msg, src, dst); + } +#endif /*HAVE_NATT*/ + + if (pfkey_send(this, msg, &out, &len) != SUCCESS) + { + DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x", ntohl(spi)); + return FAILED; + } + else if (out->sadb_msg_errno) + { + DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x: %s (%d)", + ntohl(spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno); + free(out); + return FAILED; + } + + free(out); + return SUCCESS; +} + +METHOD(kernel_ipsec_t, update_sa, status_t, + private_kernel_pfkey_ipsec_t *this, u_int32_t spi, protocol_id_t protocol, + u_int16_t cpi, host_t *src, host_t *dst, host_t *new_src, host_t *new_dst, + bool encap, bool new_encap) +{ + unsigned char request[PFKEY_BUFFER_SIZE]; + struct sadb_msg *msg, *out; + struct sadb_sa *sa; + pfkey_msg_t response; + size_t len; + + /* we can't update the SA if any of the ip addresses have changed. + * that's because we can't use SADB_UPDATE and by deleting and readding the + * SA the sequence numbers would get lost */ + if (!src->ip_equals(src, new_src) || + !dst->ip_equals(dst, new_dst)) + { + DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x: address changes" + " are not supported", ntohl(spi)); + return NOT_SUPPORTED; + } + + memset(&request, 0, sizeof(request)); + + DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi)); + + msg = (struct sadb_msg*)request; + msg->sadb_msg_version = PF_KEY_V2; + msg->sadb_msg_type = SADB_GET; + msg->sadb_msg_satype = proto_ike2satype(protocol); + msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); + + sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg); + sa->sadb_sa_exttype = SADB_EXT_SA; + sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa)); + sa->sadb_sa_spi = spi; + PFKEY_EXT_ADD(msg, sa); + + /* the kernel wants a SADB_EXT_ADDRESS_SRC to be present even though + * it is not used for anything. */ + add_anyaddr_ext(msg, dst->get_family(dst), SADB_EXT_ADDRESS_SRC); + add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0); + + if (pfkey_send(this, msg, &out, &len) != SUCCESS) + { + DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", + ntohl(spi)); + return FAILED; + } + else if (out->sadb_msg_errno) + { + DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: %s (%d)", + ntohl(spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno); + free(out); + return FAILED; + } + else if (parse_pfkey_message(out, &response) != SUCCESS) + { + DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: parsing response " + "from kernel failed", ntohl(spi)); + free(out); + return FAILED; + } + + DBG2(DBG_KNL, "updating SAD entry with SPI %.8x from %#H..%#H to %#H..%#H", + ntohl(spi), src, dst, new_src, new_dst); + + memset(&request, 0, sizeof(request)); + + msg = (struct sadb_msg*)request; + msg->sadb_msg_version = PF_KEY_V2; + msg->sadb_msg_type = SADB_UPDATE; + msg->sadb_msg_satype = proto_ike2satype(protocol); + msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); + +#ifdef __APPLE__ + { + struct sadb_sa_2 *sa_2; + sa_2 = (struct sadb_sa_2*)PFKEY_EXT_ADD_NEXT(msg); + sa_2->sa.sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa_2)); + memcpy(&sa_2->sa, response.sa, sizeof(struct sadb_sa)); + if (encap) + { + sa_2->sadb_sa_natt_port = new_dst->get_port(new_dst); + sa_2->sa.sadb_sa_flags |= SADB_X_EXT_NATT; + } + } +#else + PFKEY_EXT_COPY(msg, response.sa); +#endif + PFKEY_EXT_COPY(msg, response.x_sa2); + + PFKEY_EXT_COPY(msg, response.src); + PFKEY_EXT_COPY(msg, response.dst); + + PFKEY_EXT_COPY(msg, response.lft_soft); + PFKEY_EXT_COPY(msg, response.lft_hard); + + if (response.key_encr) + { + PFKEY_EXT_COPY(msg, response.key_encr); + } + + if (response.key_auth) + { + PFKEY_EXT_COPY(msg, response.key_auth); + } + +#ifdef HAVE_NATT + if (new_encap) + { + add_encap_ext(msg, new_src, new_dst); + } +#endif /*HAVE_NATT*/ + + free(out); + + if (pfkey_send(this, msg, &out, &len) != SUCCESS) + { + DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi)); + return FAILED; + } + else if (out->sadb_msg_errno) + { + DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x: %s (%d)", + ntohl(spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno); + free(out); + return FAILED; + } + free(out); + + return SUCCESS; +} + +METHOD(kernel_ipsec_t, query_sa, status_t, + private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst, + u_int32_t spi, protocol_id_t protocol, u_int64_t *bytes) +{ + unsigned char request[PFKEY_BUFFER_SIZE]; + struct sadb_msg *msg, *out; + struct sadb_sa *sa; + pfkey_msg_t response; + size_t len; + + memset(&request, 0, sizeof(request)); + + DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi)); + + msg = (struct sadb_msg*)request; + msg->sadb_msg_version = PF_KEY_V2; + msg->sadb_msg_type = SADB_GET; + msg->sadb_msg_satype = proto_ike2satype(protocol); + msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); + + sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg); + sa->sadb_sa_exttype = SADB_EXT_SA; + sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa)); + sa->sadb_sa_spi = spi; + PFKEY_EXT_ADD(msg, sa); + + /* the Linux Kernel doesn't care for the src address, but other systems do + * (e.g. FreeBSD) + */ + add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0); + add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0); + + if (pfkey_send(this, msg, &out, &len) != SUCCESS) + { + DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi)); + return FAILED; + } + else if (out->sadb_msg_errno) + { + DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: %s (%d)", + ntohl(spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno); + free(out); + return FAILED; + } + else if (parse_pfkey_message(out, &response) != SUCCESS) + { + DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi)); + free(out); + return FAILED; + } + *bytes = response.lft_current->sadb_lifetime_bytes; + + free(out); + return SUCCESS; +} + +METHOD(kernel_ipsec_t, del_sa, status_t, + private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst, + u_int32_t spi, protocol_id_t protocol, u_int16_t cpi) +{ + unsigned char request[PFKEY_BUFFER_SIZE]; + struct sadb_msg *msg, *out; + struct sadb_sa *sa; + size_t len; + + memset(&request, 0, sizeof(request)); + + DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x", ntohl(spi)); + + msg = (struct sadb_msg*)request; + msg->sadb_msg_version = PF_KEY_V2; + msg->sadb_msg_type = SADB_DELETE; + msg->sadb_msg_satype = proto_ike2satype(protocol); + msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); + + sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg); + sa->sadb_sa_exttype = SADB_EXT_SA; + sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa)); + sa->sadb_sa_spi = spi; + PFKEY_EXT_ADD(msg, sa); + + /* the Linux Kernel doesn't care for the src address, but other systems do + * (e.g. FreeBSD) + */ + add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0); + add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0); + + if (pfkey_send(this, msg, &out, &len) != SUCCESS) + { + DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x", ntohl(spi)); + return FAILED; + } + else if (out->sadb_msg_errno) + { + DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x: %s (%d)", + ntohl(spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno); + free(out); + return FAILED; + } + + DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x", ntohl(spi)); + free(out); + return SUCCESS; +} + +METHOD(kernel_ipsec_t, add_policy, status_t, + private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst, + traffic_selector_t *src_ts, traffic_selector_t *dst_ts, + policy_dir_t direction, u_int32_t spi, protocol_id_t protocol, + u_int32_t reqid, ipsec_mode_t mode, u_int16_t ipcomp, u_int16_t cpi, + bool routed) +{ + unsigned char request[PFKEY_BUFFER_SIZE]; + struct sadb_msg *msg, *out; + struct sadb_x_policy *pol; + struct sadb_x_ipsecrequest *req; + policy_entry_t *policy, *found = NULL; + pfkey_msg_t response; + size_t len; + + if (dir2kernel(direction) == IPSEC_DIR_INVALID) + { + /* FWD policies are not supported on all platforms */ + return SUCCESS; + } + + /* create a policy */ + policy = create_policy_entry(src_ts, dst_ts, direction, reqid); + + /* find a matching policy */ + this->mutex->lock(this->mutex); + if (this->policies->find_first(this->policies, + (linked_list_match_t)policy_entry_equals, (void**)&found, policy) == SUCCESS) + { + /* use existing policy */ + found->refcount++; + DBG2(DBG_KNL, "policy %R === %R %N already exists, increasing " + "refcount", src_ts, dst_ts, + policy_dir_names, direction); + policy_entry_destroy(policy); + policy = found; + } + else + { + /* apply the new one, if we have no such policy */ + this->policies->insert_last(this->policies, policy); + policy->refcount = 1; + } + + memset(&request, 0, sizeof(request)); + + DBG2(DBG_KNL, "adding policy %R === %R %N", src_ts, dst_ts, + policy_dir_names, direction); + + msg = (struct sadb_msg*)request; + msg->sadb_msg_version = PF_KEY_V2; + msg->sadb_msg_type = found ? SADB_X_SPDUPDATE : SADB_X_SPDADD; + msg->sadb_msg_satype = 0; + msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); + + pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg); + pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; + pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy)); + pol->sadb_x_policy_id = 0; + pol->sadb_x_policy_dir = dir2kernel(direction); + pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; +#ifdef HAVE_STRUCT_SADB_X_POLICY_SADB_X_POLICY_PRIORITY + /* calculate priority based on source selector size, small size = high prio */ + pol->sadb_x_policy_priority = routed ? PRIO_LOW : PRIO_HIGH; + pol->sadb_x_policy_priority -= policy->src.mask * 10; + pol->sadb_x_policy_priority -= policy->src.proto != IPSEC_PROTO_ANY ? 2 : 0; + pol->sadb_x_policy_priority -= policy->src.net->get_port(policy->src.net) ? 1 : 0; +#endif + + /* one or more sadb_x_ipsecrequest extensions are added to the sadb_x_policy extension */ + req = (struct sadb_x_ipsecrequest*)(pol + 1); + req->sadb_x_ipsecrequest_proto = proto_ike2ip(protocol); + /* !!! the length of this struct MUST be in octets instead of 64 bit words */ + req->sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest); + req->sadb_x_ipsecrequest_mode = mode2kernel(mode); + req->sadb_x_ipsecrequest_reqid = reqid; + req->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; + if (mode == MODE_TUNNEL) + { + sockaddr_t *sa; + socklen_t sl; + sa = src->get_sockaddr(src); + sl = *src->get_sockaddr_len(src); + memcpy(req + 1, sa, sl); + sa = dst->get_sockaddr(dst); + memcpy((u_int8_t*)(req + 1) + sl, sa, sl); + req->sadb_x_ipsecrequest_len += sl * 2; + } + + pol->sadb_x_policy_len += PFKEY_LEN(req->sadb_x_ipsecrequest_len); + PFKEY_EXT_ADD(msg, pol); + + add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto, + policy->src.mask); + add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto, + policy->dst.mask); + +#ifdef __FreeBSD__ + { /* on FreeBSD a lifetime has to be defined to be able to later query + * the current use time. */ + struct sadb_lifetime *lft; + lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg); + lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; + lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime)); + lft->sadb_lifetime_addtime = LONG_MAX; + PFKEY_EXT_ADD(msg, lft); + } +#endif + + this->mutex->unlock(this->mutex); + + if (pfkey_send(this, msg, &out, &len) != SUCCESS) + { + DBG1(DBG_KNL, "unable to add policy %R === %R %N", src_ts, dst_ts, + policy_dir_names, direction); + return FAILED; + } + else if (out->sadb_msg_errno) + { + DBG1(DBG_KNL, "unable to add policy %R === %R %N: %s (%d)", src_ts, dst_ts, + policy_dir_names, direction, + strerror(out->sadb_msg_errno), out->sadb_msg_errno); + free(out); + return FAILED; + } + else if (parse_pfkey_message(out, &response) != SUCCESS) + { + DBG1(DBG_KNL, "unable to add policy %R === %R %N: parsing response " + "from kernel failed", src_ts, dst_ts, policy_dir_names, direction); + free(out); + return FAILED; + } + + this->mutex->lock(this->mutex); + + /* we try to find the policy again and update the kernel index */ + if (this->policies->find_last(this->policies, NULL, (void**)&policy) != SUCCESS) + { + DBG2(DBG_KNL, "unable to update index, the policy %R === %R %N is " + "already gone, ignoring", src_ts, dst_ts, policy_dir_names, direction); + this->mutex->unlock(this->mutex); + free(out); + return SUCCESS; + } + policy->index = response.x_policy->sadb_x_policy_id; + free(out); + + /* install a route, if: + * - we are NOT updating a policy + * - this is a forward policy (to just get one for each child) + * - we are in tunnel mode + * - we are not using IPv6 (does not work correctly yet!) + * - routing is not disabled via strongswan.conf + */ + if (policy->route == NULL && direction == POLICY_FWD && + mode != MODE_TRANSPORT && src->get_family(src) != AF_INET6 && + this->install_routes) + { + route_entry_t *route = malloc_thing(route_entry_t); + + if (charon->kernel_interface->get_address_by_ts(charon->kernel_interface, + dst_ts, &route->src_ip) == SUCCESS) + { + /* get the nexthop to src (src as we are in POLICY_FWD).*/ + route->gateway = charon->kernel_interface->get_nexthop( + charon->kernel_interface, src); + route->if_name = charon->kernel_interface->get_interface( + charon->kernel_interface, dst); + route->dst_net = chunk_clone(policy->src.net->get_address(policy->src.net)); + route->prefixlen = policy->src.mask; + + switch (charon->kernel_interface->add_route(charon->kernel_interface, + route->dst_net, route->prefixlen, route->gateway, + route->src_ip, route->if_name)) + { + default: + DBG1(DBG_KNL, "unable to install source route for %H", + route->src_ip); + /* FALL */ + case ALREADY_DONE: + /* route exists, do not uninstall */ + route_entry_destroy(route); + break; + case SUCCESS: + /* cache the installed route */ + policy->route = route; + break; + } + } + else + { + free(route); + } + } + + this->mutex->unlock(this->mutex); + + return SUCCESS; +} + +METHOD(kernel_ipsec_t, query_policy, status_t, + private_kernel_pfkey_ipsec_t *this, traffic_selector_t *src_ts, + traffic_selector_t *dst_ts, policy_dir_t direction, u_int32_t *use_time) +{ + unsigned char request[PFKEY_BUFFER_SIZE]; + struct sadb_msg *msg, *out; + struct sadb_x_policy *pol; + policy_entry_t *policy, *found = NULL; + pfkey_msg_t response; + size_t len; + + if (dir2kernel(direction) == IPSEC_DIR_INVALID) + { + /* FWD policies are not supported on all platforms */ + return NOT_FOUND; + } + + DBG2(DBG_KNL, "querying policy %R === %R %N", src_ts, dst_ts, + policy_dir_names, direction); + + /* create a policy */ + policy = create_policy_entry(src_ts, dst_ts, direction, 0); + + /* find a matching policy */ + this->mutex->lock(this->mutex); + if (this->policies->find_first(this->policies, + (linked_list_match_t)policy_entry_equals, (void**)&found, policy) != SUCCESS) + { + DBG1(DBG_KNL, "querying policy %R === %R %N failed, not found", src_ts, + dst_ts, policy_dir_names, direction); + policy_entry_destroy(policy); + this->mutex->unlock(this->mutex); + return NOT_FOUND; + } + policy_entry_destroy(policy); + policy = found; + + memset(&request, 0, sizeof(request)); + + msg = (struct sadb_msg*)request; + msg->sadb_msg_version = PF_KEY_V2; + msg->sadb_msg_type = SADB_X_SPDGET; + msg->sadb_msg_satype = 0; + msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); + + pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg); + pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; + pol->sadb_x_policy_id = policy->index; + pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy)); + pol->sadb_x_policy_dir = dir2kernel(direction); + pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; + PFKEY_EXT_ADD(msg, pol); + + add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto, + policy->src.mask); + add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto, + policy->dst.mask); + + this->mutex->unlock(this->mutex); + + if (pfkey_send(this, msg, &out, &len) != SUCCESS) + { + DBG1(DBG_KNL, "unable to query policy %R === %R %N", src_ts, dst_ts, + policy_dir_names, direction); + return FAILED; + } + else if (out->sadb_msg_errno) + { + DBG1(DBG_KNL, "unable to query policy %R === %R %N: %s (%d)", src_ts, + dst_ts, policy_dir_names, direction, + strerror(out->sadb_msg_errno), out->sadb_msg_errno); + free(out); + return FAILED; + } + else if (parse_pfkey_message(out, &response) != SUCCESS) + { + DBG1(DBG_KNL, "unable to query policy %R === %R %N: parsing response " + "from kernel failed", src_ts, dst_ts, policy_dir_names, direction); + free(out); + return FAILED; + } + else if (response.lft_current == NULL) + { + DBG1(DBG_KNL, "unable to query policy %R === %R %N: kernel reports no " + "use time", src_ts, dst_ts, policy_dir_names, direction); + free(out); + return FAILED; + } + /* we need the monotonic time, but the kernel returns system time. */ + if (response.lft_current->sadb_lifetime_usetime) + { + *use_time = time_monotonic(NULL) - + (time(NULL) - response.lft_current->sadb_lifetime_usetime); + } + else + { + *use_time = 0; + } + free(out); + + return SUCCESS; +} + +METHOD(kernel_ipsec_t, del_policy, status_t, + private_kernel_pfkey_ipsec_t *this, traffic_selector_t *src_ts, + traffic_selector_t *dst_ts, policy_dir_t direction, bool unrouted) +{ + unsigned char request[PFKEY_BUFFER_SIZE]; + struct sadb_msg *msg, *out; + struct sadb_x_policy *pol; + policy_entry_t *policy, *found = NULL; + route_entry_t *route; + size_t len; + + if (dir2kernel(direction) == IPSEC_DIR_INVALID) + { + /* FWD policies are not supported on all platforms */ + return SUCCESS; + } + + DBG2(DBG_KNL, "deleting policy %R === %R %N", src_ts, dst_ts, + policy_dir_names, direction); + + /* create a policy */ + policy = create_policy_entry(src_ts, dst_ts, direction, 0); + + /* find a matching policy */ + this->mutex->lock(this->mutex); + if (this->policies->find_first(this->policies, + (linked_list_match_t)policy_entry_equals, (void**)&found, policy) == SUCCESS) + { + if (--found->refcount > 0) + { + /* is used by more SAs, keep in kernel */ + DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed"); + policy_entry_destroy(policy); + this->mutex->unlock(this->mutex); + return SUCCESS; + } + /* remove if last reference */ + this->policies->remove(this->policies, found, NULL); + policy_entry_destroy(policy); + policy = found; + } + else + { + DBG1(DBG_KNL, "deleting policy %R === %R %N failed, not found", src_ts, + dst_ts, policy_dir_names, direction); + policy_entry_destroy(policy); + this->mutex->unlock(this->mutex); + return NOT_FOUND; + } + this->mutex->unlock(this->mutex); + + memset(&request, 0, sizeof(request)); + + msg = (struct sadb_msg*)request; + msg->sadb_msg_version = PF_KEY_V2; + msg->sadb_msg_type = SADB_X_SPDDELETE; + msg->sadb_msg_satype = 0; + msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); + + pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg); + pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; + pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy)); + pol->sadb_x_policy_dir = dir2kernel(direction); + pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; + PFKEY_EXT_ADD(msg, pol); + + add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto, + policy->src.mask); + add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto, + policy->dst.mask); + + route = policy->route; + policy->route = NULL; + policy_entry_destroy(policy); + + if (pfkey_send(this, msg, &out, &len) != SUCCESS) + { + DBG1(DBG_KNL, "unable to delete policy %R === %R %N", src_ts, dst_ts, + policy_dir_names, direction); + return FAILED; + } + else if (out->sadb_msg_errno) + { + DBG1(DBG_KNL, "unable to delete policy %R === %R %N: %s (%d)", src_ts, + dst_ts, policy_dir_names, direction, + strerror(out->sadb_msg_errno), out->sadb_msg_errno); + free(out); + return FAILED; + } + free(out); + + if (route) + { + if (charon->kernel_interface->del_route(charon->kernel_interface, + route->dst_net, route->prefixlen, route->gateway, + route->src_ip, route->if_name) != SUCCESS) + { + DBG1(DBG_KNL, "error uninstalling route installed with " + "policy %R === %R %N", src_ts, dst_ts, + policy_dir_names, direction); + } + route_entry_destroy(route); + } + + return SUCCESS; +} + +/** + * Register a socket for AQUIRE/EXPIRE messages + */ +static status_t register_pfkey_socket(private_kernel_pfkey_ipsec_t *this, + u_int8_t satype) +{ + unsigned char request[PFKEY_BUFFER_SIZE]; + struct sadb_msg *msg, *out; + size_t len; + + memset(&request, 0, sizeof(request)); + + msg = (struct sadb_msg*)request; + msg->sadb_msg_version = PF_KEY_V2; + msg->sadb_msg_type = SADB_REGISTER; + msg->sadb_msg_satype = satype; + msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); + + if (pfkey_send_socket(this, this->socket_events, msg, &out, &len) != SUCCESS) + { + DBG1(DBG_KNL, "unable to register PF_KEY socket"); + return FAILED; + } + else if (out->sadb_msg_errno) + { + DBG1(DBG_KNL, "unable to register PF_KEY socket: %s (%d)", + strerror(out->sadb_msg_errno), out->sadb_msg_errno); + free(out); + return FAILED; + } + free(out); + return SUCCESS; +} + +METHOD(kernel_ipsec_t, bypass_socket, bool, + private_kernel_pfkey_ipsec_t *this, int fd, int family) +{ + struct sadb_x_policy policy; + u_int sol, ipsec_policy; + + switch (family) + { + case AF_INET: + { + sol = SOL_IP; + ipsec_policy = IP_IPSEC_POLICY; + break; + } + case AF_INET6: + { + sol = SOL_IPV6; + ipsec_policy = IPV6_IPSEC_POLICY; + break; + } + default: + return FALSE; + } + + memset(&policy, 0, sizeof(policy)); + policy.sadb_x_policy_len = sizeof(policy) / sizeof(u_int64_t); + policy.sadb_x_policy_exttype = SADB_X_EXT_POLICY; + policy.sadb_x_policy_type = IPSEC_POLICY_BYPASS; + + policy.sadb_x_policy_dir = IPSEC_DIR_OUTBOUND; + 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.sadb_x_policy_dir = IPSEC_DIR_INBOUND; + if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0) + { + DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s", + strerror(errno)); + return FALSE; + } + return TRUE; +} + +METHOD(kernel_ipsec_t, destroy, void, + private_kernel_pfkey_ipsec_t *this) +{ + if (this->job) + { + this->job->cancel(this->job); + } + if (this->socket > 0) + { + close(this->socket); + } + if (this->socket_events > 0) + { + close(this->socket_events); + } + this->policies->destroy_function(this->policies, (void*)policy_entry_destroy); + this->mutex->destroy(this->mutex); + this->mutex_pfkey->destroy(this->mutex_pfkey); + free(this); +} + +/* + * Described in header. + */ +kernel_pfkey_ipsec_t *kernel_pfkey_ipsec_create() +{ + private_kernel_pfkey_ipsec_t *this; + + INIT(this, + .public.interface = { + .get_spi = _get_spi, + .get_cpi = _get_cpi, + .add_sa = _add_sa, + .update_sa = _update_sa, + .query_sa = _query_sa, + .del_sa = _del_sa, + .add_policy = _add_policy, + .query_policy = _query_policy, + .del_policy = _del_policy, + .bypass_socket = _bypass_socket, + .destroy = _destroy, + }, + .policies = linked_list_create(), + .mutex = mutex_create(MUTEX_TYPE_DEFAULT), + .mutex_pfkey = mutex_create(MUTEX_TYPE_DEFAULT), + .install_routes = lib->settings->get_bool(lib->settings, + "charon.install_routes", TRUE), + ); + + /* create a PF_KEY socket to communicate with the kernel */ + this->socket = socket(PF_KEY, SOCK_RAW, PF_KEY_V2); + if (this->socket <= 0) + { + DBG1(DBG_KNL, "unable to create PF_KEY socket"); + destroy(this); + return NULL; + } + + /* create a PF_KEY socket for ACQUIRE & EXPIRE */ + this->socket_events = socket(PF_KEY, SOCK_RAW, PF_KEY_V2); + if (this->socket_events <= 0) + { + DBG1(DBG_KNL, "unable to create PF_KEY event socket"); + destroy(this); + return NULL; + } + + /* register the event socket */ + if (register_pfkey_socket(this, SADB_SATYPE_ESP) != SUCCESS || + register_pfkey_socket(this, SADB_SATYPE_AH) != SUCCESS) + { + DBG1(DBG_KNL, "unable to register PF_KEY event socket"); + destroy(this); + return NULL; + } + + this->job = callback_job_create((callback_job_cb_t)receive_events, + this, NULL, NULL); + charon->processor->queue_job(charon->processor, (job_t*)this->job); + + return &this->public; +} + |