diff options
Diffstat (limited to 'src/libcharon/plugins/kernel_netlink')
9 files changed, 0 insertions, 4327 deletions
diff --git a/src/libcharon/plugins/kernel_netlink/Makefile.am b/src/libcharon/plugins/kernel_netlink/Makefile.am deleted file mode 100644 index 2bb00ec0d..000000000 --- a/src/libcharon/plugins/kernel_netlink/Makefile.am +++ /dev/null @@ -1,20 +0,0 @@ - -INCLUDES = -I${linux_headers} -I$(top_srcdir)/src/libstrongswan \ - -I$(top_srcdir)/src/libhydra -I$(top_srcdir)/src/libcharon - -AM_CFLAGS = -rdynamic \ --DROUTING_TABLE=${routing_table} \ --DROUTING_TABLE_PRIO=${routing_table_prio} - -if MONOLITHIC -noinst_LTLIBRARIES = libstrongswan-kernel-netlink.la -else -plugin_LTLIBRARIES = libstrongswan-kernel-netlink.la -endif - -libstrongswan_kernel_netlink_la_SOURCES = \ - kernel_netlink_plugin.h kernel_netlink_plugin.c \ - kernel_netlink_ipsec.h kernel_netlink_ipsec.c kernel_netlink_net.h kernel_netlink_net.c \ - kernel_netlink_shared.h kernel_netlink_shared.c - -libstrongswan_kernel_netlink_la_LDFLAGS = -module -avoid-version diff --git a/src/libcharon/plugins/kernel_netlink/kernel_netlink_ipsec.c b/src/libcharon/plugins/kernel_netlink/kernel_netlink_ipsec.c deleted file mode 100644 index 7de60b00a..000000000 --- a/src/libcharon/plugins/kernel_netlink/kernel_netlink_ipsec.c +++ /dev/null @@ -1,2208 +0,0 @@ -/* - * Copyright (C) 2006-2010 Tobias Brunner - * Copyright (C) 2005-2009 Martin Willi - * Copyright (C) 2008 Andreas Steffen - * Copyright (C) 2006-2007 Fabian Hartmann, Noah Heusser - * Copyright (C) 2006 Daniel Roethlisberger - * Copyright (C) 2005 Jan Hutter - * Hochschule fuer Technik Rapperswil - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. See <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> -#include <stdint.h> -#include <linux/ipsec.h> -#include <linux/netlink.h> -#include <linux/rtnetlink.h> -#include <linux/xfrm.h> -#include <linux/udp.h> -#include <unistd.h> -#include <time.h> -#include <errno.h> -#include <string.h> -#include <fcntl.h> - -#include "kernel_netlink_ipsec.h" -#include "kernel_netlink_shared.h" - -#include <hydra.h> -#include <daemon.h> -#include <threading/thread.h> -#include <threading/mutex.h> -#include <utils/hashtable.h> -#include <processing/jobs/callback_job.h> - -/** required for Linux 2.6.26 kernel and later */ -#ifndef XFRM_STATE_AF_UNSPEC -#define XFRM_STATE_AF_UNSPEC 32 -#endif - -/** from linux/in.h */ -#ifndef IP_XFRM_POLICY -#define IP_XFRM_POLICY 17 -#endif - -/* missing on uclibc */ -#ifndef IPV6_XFRM_POLICY -#define IPV6_XFRM_POLICY 34 -#endif /*IPV6_XFRM_POLICY*/ - -/** default priority of installed policies */ -#define PRIO_LOW 3000 -#define PRIO_HIGH 2000 - -/** - * map the limit for bytes and packets to XFRM_INF per default - */ -#define XFRM_LIMIT(x) ((x) == 0 ? XFRM_INF : (x)) - -/** - * Create ORable bitfield of XFRM NL groups - */ -#define XFRMNLGRP(x) (1<<(XFRMNLGRP_##x-1)) - -/** - * returns a pointer to the first rtattr following the nlmsghdr *nlh and the - * 'usual' netlink data x like 'struct xfrm_usersa_info' - */ -#define XFRM_RTA(nlh, x) ((struct rtattr*)(NLMSG_DATA(nlh) + NLMSG_ALIGN(sizeof(x)))) -/** - * returns a pointer to the next rtattr following rta. - * !!! do not use this to parse messages. use RTA_NEXT and RTA_OK instead !!! - */ -#define XFRM_RTA_NEXT(rta) ((struct rtattr*)(((char*)(rta)) + RTA_ALIGN((rta)->rta_len))) -/** - * returns the total size of attached rta data - * (after 'usual' netlink data x like 'struct xfrm_usersa_info') - */ -#define XFRM_PAYLOAD(nlh, x) NLMSG_PAYLOAD(nlh, sizeof(x)) - -typedef struct kernel_algorithm_t kernel_algorithm_t; - -/** - * Mapping of IKEv2 kernel identifier to linux crypto API names - */ -struct kernel_algorithm_t { - /** - * Identifier specified in IKEv2 - */ - int ikev2; - - /** - * Name of the algorithm in linux crypto API - */ - char *name; -}; - -ENUM(xfrm_msg_names, XFRM_MSG_NEWSA, XFRM_MSG_MAPPING, - "XFRM_MSG_NEWSA", - "XFRM_MSG_DELSA", - "XFRM_MSG_GETSA", - "XFRM_MSG_NEWPOLICY", - "XFRM_MSG_DELPOLICY", - "XFRM_MSG_GETPOLICY", - "XFRM_MSG_ALLOCSPI", - "XFRM_MSG_ACQUIRE", - "XFRM_MSG_EXPIRE", - "XFRM_MSG_UPDPOLICY", - "XFRM_MSG_UPDSA", - "XFRM_MSG_POLEXPIRE", - "XFRM_MSG_FLUSHSA", - "XFRM_MSG_FLUSHPOLICY", - "XFRM_MSG_NEWAE", - "XFRM_MSG_GETAE", - "XFRM_MSG_REPORT", - "XFRM_MSG_MIGRATE", - "XFRM_MSG_NEWSADINFO", - "XFRM_MSG_GETSADINFO", - "XFRM_MSG_NEWSPDINFO", - "XFRM_MSG_GETSPDINFO", - "XFRM_MSG_MAPPING" -); - -ENUM(xfrm_attr_type_names, XFRMA_UNSPEC, XFRMA_KMADDRESS, - "XFRMA_UNSPEC", - "XFRMA_ALG_AUTH", - "XFRMA_ALG_CRYPT", - "XFRMA_ALG_COMP", - "XFRMA_ENCAP", - "XFRMA_TMPL", - "XFRMA_SA", - "XFRMA_POLICY", - "XFRMA_SEC_CTX", - "XFRMA_LTIME_VAL", - "XFRMA_REPLAY_VAL", - "XFRMA_REPLAY_THRESH", - "XFRMA_ETIMER_THRESH", - "XFRMA_SRCADDR", - "XFRMA_COADDR", - "XFRMA_LASTUSED", - "XFRMA_POLICY_TYPE", - "XFRMA_MIGRATE", - "XFRMA_ALG_AEAD", - "XFRMA_KMADDRESS" -); - -#define END_OF_LIST -1 - -/** - * Algorithms for encryption - */ -static kernel_algorithm_t encryption_algs[] = { -/* {ENCR_DES_IV64, "***" }, */ - {ENCR_DES, "des" }, - {ENCR_3DES, "des3_ede" }, -/* {ENCR_RC5, "***" }, */ -/* {ENCR_IDEA, "***" }, */ - {ENCR_CAST, "cast128" }, - {ENCR_BLOWFISH, "blowfish" }, -/* {ENCR_3IDEA, "***" }, */ -/* {ENCR_DES_IV32, "***" }, */ - {ENCR_NULL, "cipher_null" }, - {ENCR_AES_CBC, "aes" }, - {ENCR_AES_CTR, "rfc3686(ctr(aes))" }, - {ENCR_AES_CCM_ICV8, "rfc4309(ccm(aes))" }, - {ENCR_AES_CCM_ICV12, "rfc4309(ccm(aes))" }, - {ENCR_AES_CCM_ICV16, "rfc4309(ccm(aes))" }, - {ENCR_AES_GCM_ICV8, "rfc4106(gcm(aes))" }, - {ENCR_AES_GCM_ICV12, "rfc4106(gcm(aes))" }, - {ENCR_AES_GCM_ICV16, "rfc4106(gcm(aes))" }, - {ENCR_NULL_AUTH_AES_GMAC, "rfc4543(gcm(aes))" }, - {ENCR_CAMELLIA_CBC, "cbc(camellia)" }, -/* {ENCR_CAMELLIA_CTR, "***" }, */ -/* {ENCR_CAMELLIA_CCM_ICV8, "***" }, */ -/* {ENCR_CAMELLIA_CCM_ICV12, "***" }, */ -/* {ENCR_CAMELLIA_CCM_ICV16, "***" }, */ - {END_OF_LIST, NULL } -}; - -/** - * Algorithms for integrity protection - */ -static kernel_algorithm_t integrity_algs[] = { - {AUTH_HMAC_MD5_96, "md5" }, - {AUTH_HMAC_SHA1_96, "sha1" }, - {AUTH_HMAC_SHA2_256_96, "sha256" }, - {AUTH_HMAC_SHA2_256_128, "hmac(sha256)" }, - {AUTH_HMAC_SHA2_384_192, "hmac(sha384)" }, - {AUTH_HMAC_SHA2_512_256, "hmac(sha512)" }, -/* {AUTH_DES_MAC, "***" }, */ -/* {AUTH_KPDK_MD5, "***" }, */ - {AUTH_AES_XCBC_96, "xcbc(aes)" }, - {END_OF_LIST, NULL } -}; - -/** - * Algorithms for IPComp - */ -static kernel_algorithm_t compression_algs[] = { -/* {IPCOMP_OUI, "***" }, */ - {IPCOMP_DEFLATE, "deflate" }, - {IPCOMP_LZS, "lzs" }, - {IPCOMP_LZJH, "lzjh" }, - {END_OF_LIST, NULL } -}; - -/** - * Look up a kernel algorithm name and its key size - */ -static char* lookup_algorithm(kernel_algorithm_t *list, int ikev2) -{ - while (list->ikev2 != END_OF_LIST) - { - if (list->ikev2 == ikev2) - { - return list->name; - } - list++; - } - return NULL; -} - -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); - this->src_ip->destroy(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 { - - /** 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; - - /** by how many CHILD_SA's this policy is used */ - u_int refcount; -}; - -/** - * 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; -} - -typedef struct private_kernel_netlink_ipsec_t private_kernel_netlink_ipsec_t; - -/** - * Private variables and functions of kernel_netlink class. - */ -struct private_kernel_netlink_ipsec_t { - /** - * Public part of the kernel_netlink_t object. - */ - kernel_netlink_ipsec_t public; - - /** - * mutex to lock access to various lists - */ - mutex_t *mutex; - - /** - * Hash table of installed policies (policy_entry_t) - */ - hashtable_t *policies; - - /** - * job receiving netlink events - */ - callback_job_t *job; - - /** - * Netlink xfrm socket (IPsec) - */ - netlink_socket_t *socket_xfrm; - - /** - * netlink xfrm socket to receive acquire and expire events - */ - int socket_xfrm_events; - - /** - * whether to install routes along policies - */ - bool install_routes; -}; - -/** - * 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 a 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 a 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) -{ - u_int32_t reqid = 0; - int proto = 0; - traffic_selector_t *src_ts, *dst_ts; - struct xfrm_user_acquire *acquire; - struct rtattr *rta; - size_t rtasize; - - 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) -{ - u_int8_t protocol; - u_int32_t spi, reqid; - struct xfrm_user_expire *expire; - - 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) -{ - traffic_selector_t *src_ts, *dst_ts; - host_t *local = NULL, *remote = NULL; - host_t *old_src = NULL, *old_dst = NULL; - host_t *new_src = NULL, *new_dst = NULL; - struct xfrm_userpolicy_id *policy_id; - struct rtattr *rta; - size_t rtasize; - u_int32_t reqid = 0; - policy_dir_t dir; - - 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) -{ - u_int32_t spi, reqid; - struct xfrm_user_mapping *mapping; - host_t *host; - - mapping = (struct xfrm_user_mapping*)NLMSG_DATA(hdr); - spi = mapping->id.spi; - reqid = mapping->reqid; - - DBG2(DBG_KNL, "received a XFRM_MSG_MAPPING"); - - if (mapping->id.proto == IPPROTO_ESP) - { - 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, - lifetime_cfg_t *lifetime, u_int16_t enc_alg, chunk_t enc_key, - u_int16_t int_alg, chunk_t int_key, ipsec_mode_t mode, u_int16_t ipcomp, - u_int16_t cpi, bool encap, bool inbound, - traffic_selector_t* src_ts, traffic_selector_t* dst_ts) -{ - netlink_buf_t request; - char *alg_name; - struct nlmsghdr *hdr; - struct xfrm_usersa_info *sa; - u_int16_t icv_size = 64; - - /* if IPComp is used, we install an additional IPComp SA. if the cpi is 0 - * we are in the recursive call below */ - if (ipcomp != IPCOMP_NONE && cpi != 0) - { - lifetime_cfg_t lft = {{0,0,0},{0,0,0},{0,0,0}}; - add_sa(this, src, dst, htonl(ntohs(cpi)), IPPROTO_COMP, reqid, mark, - &lft, ENCR_UNDEFINED, chunk_empty, AUTH_UNDEFINED, chunk_empty, - mode, ipcomp, 0, FALSE, inbound, NULL, NULL); - ipcomp = IPCOMP_NONE; - /* use transport mode ESP SA, IPComp uses tunnel mode */ - mode = MODE_TRANSPORT; - } - - memset(&request, 0, sizeof(request)); - - if (mark.value) - { - DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%u} " - "(mark %u/0x%8x)", ntohl(spi), reqid, mark.value, mark.mask); - } - else - { - DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%u}", - ntohl(spi), reqid); - } - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; - hdr->nlmsg_type = inbound ? XFRM_MSG_UPDSA : XFRM_MSG_NEWSA; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info)); - - sa = (struct xfrm_usersa_info*)NLMSG_DATA(hdr); - host2xfrm(src, &sa->saddr); - host2xfrm(dst, &sa->id.daddr); - sa->id.spi = spi; - sa->id.proto = protocol; - sa->family = src->get_family(src); - sa->mode = mode2kernel(mode); - switch (mode) - { - case MODE_TUNNEL: - sa->flags |= XFRM_STATE_AF_UNSPEC; - break; - case MODE_BEET: - if(src_ts && dst_ts) - { - sa->sel = ts2selector(src_ts, dst_ts); - } - break; - default: - break; - } - - sa->replay_window = (protocol == IPPROTO_COMP) ? 0 : 32; - sa->reqid = reqid; - sa->lft.soft_byte_limit = XFRM_LIMIT(lifetime->bytes.rekey); - sa->lft.hard_byte_limit = XFRM_LIMIT(lifetime->bytes.life); - sa->lft.soft_packet_limit = XFRM_LIMIT(lifetime->packets.rekey); - sa->lft.hard_packet_limit = XFRM_LIMIT(lifetime->packets.life); - /* we use lifetimes since added, not since used */ - sa->lft.soft_add_expires_seconds = lifetime->time.rekey; - sa->lft.hard_add_expires_seconds = lifetime->time.life; - sa->lft.soft_use_expires_seconds = 0; - sa->lft.hard_use_expires_seconds = 0; - - struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_usersa_info); - - switch (enc_alg) - { - case ENCR_UNDEFINED: - /* no encryption */ - break; - case ENCR_AES_CCM_ICV16: - case ENCR_AES_GCM_ICV16: - case ENCR_NULL_AUTH_AES_GMAC: - case ENCR_CAMELLIA_CCM_ICV16: - icv_size += 32; - /* FALL */ - case ENCR_AES_CCM_ICV12: - case ENCR_AES_GCM_ICV12: - case ENCR_CAMELLIA_CCM_ICV12: - icv_size += 32; - /* FALL */ - case ENCR_AES_CCM_ICV8: - case ENCR_AES_GCM_ICV8: - case ENCR_CAMELLIA_CCM_ICV8: - { - struct xfrm_algo_aead *algo; - - alg_name = lookup_algorithm(encryption_algs, enc_alg); - if (alg_name == NULL) - { - DBG1(DBG_KNL, "algorithm %N not supported by kernel!", - encryption_algorithm_names, enc_alg); - return FAILED; - } - DBG2(DBG_KNL, " using encryption algorithm %N with key size %d", - encryption_algorithm_names, enc_alg, enc_key.len * 8); - - rthdr->rta_type = XFRMA_ALG_AEAD; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo_aead) + enc_key.len); - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - algo = (struct xfrm_algo_aead*)RTA_DATA(rthdr); - algo->alg_key_len = enc_key.len * 8; - algo->alg_icv_len = icv_size; - strcpy(algo->alg_name, alg_name); - memcpy(algo->alg_key, enc_key.ptr, enc_key.len); - - rthdr = XFRM_RTA_NEXT(rthdr); - break; - } - default: - { - struct xfrm_algo *algo; - - alg_name = lookup_algorithm(encryption_algs, enc_alg); - if (alg_name == NULL) - { - DBG1(DBG_KNL, "algorithm %N not supported by kernel!", - encryption_algorithm_names, enc_alg); - return FAILED; - } - DBG2(DBG_KNL, " using encryption algorithm %N with key size %d", - encryption_algorithm_names, enc_alg, enc_key.len * 8); - - rthdr->rta_type = XFRMA_ALG_CRYPT; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + enc_key.len); - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - algo = (struct xfrm_algo*)RTA_DATA(rthdr); - algo->alg_key_len = enc_key.len * 8; - strcpy(algo->alg_name, alg_name); - memcpy(algo->alg_key, enc_key.ptr, enc_key.len); - - rthdr = XFRM_RTA_NEXT(rthdr); - } - } - - if (int_alg != AUTH_UNDEFINED) - { - alg_name = lookup_algorithm(integrity_algs, int_alg); - if (alg_name == NULL) - { - DBG1(DBG_KNL, "algorithm %N not supported by kernel!", - integrity_algorithm_names, int_alg); - return FAILED; - } - DBG2(DBG_KNL, " using integrity algorithm %N with key size %d", - integrity_algorithm_names, int_alg, int_key.len * 8); - - if (int_alg == AUTH_HMAC_SHA2_256_128) - { - struct xfrm_algo_auth* algo; - - /* the kernel uses SHA256 with 96 bit truncation by default, - * use specified truncation size supported by newer kernels */ - rthdr->rta_type = XFRMA_ALG_AUTH_TRUNC; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo_auth) + int_key.len); - - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - algo = (struct xfrm_algo_auth*)RTA_DATA(rthdr); - algo->alg_key_len = int_key.len * 8; - algo->alg_trunc_len = 128; - strcpy(algo->alg_name, alg_name); - memcpy(algo->alg_key, int_key.ptr, int_key.len); - } - else - { - struct xfrm_algo* algo; - - rthdr->rta_type = XFRMA_ALG_AUTH; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + int_key.len); - - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - algo = (struct xfrm_algo*)RTA_DATA(rthdr); - algo->alg_key_len = int_key.len * 8; - strcpy(algo->alg_name, alg_name); - memcpy(algo->alg_key, int_key.ptr, int_key.len); - } - rthdr = XFRM_RTA_NEXT(rthdr); - } - - if (ipcomp != IPCOMP_NONE) - { - rthdr->rta_type = XFRMA_ALG_COMP; - alg_name = lookup_algorithm(compression_algs, ipcomp); - if (alg_name == NULL) - { - DBG1(DBG_KNL, "algorithm %N not supported by kernel!", - ipcomp_transform_names, ipcomp); - return FAILED; - } - DBG2(DBG_KNL, " using compression algorithm %N", - ipcomp_transform_names, ipcomp); - - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo)); - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - struct xfrm_algo* algo = (struct xfrm_algo*)RTA_DATA(rthdr); - algo->alg_key_len = 0; - strcpy(algo->alg_name, alg_name); - - rthdr = XFRM_RTA_NEXT(rthdr); - } - - if (encap) - { - struct xfrm_encap_tmpl *tmpl; - - rthdr->rta_type = XFRMA_ENCAP; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_encap_tmpl)); - - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rthdr); - tmpl->encap_type = UDP_ENCAP_ESPINUDP; - tmpl->encap_sport = htons(src->get_port(src)); - tmpl->encap_dport = htons(dst->get_port(dst)); - memset(&tmpl->encap_oa, 0, sizeof (xfrm_address_t)); - /* encap_oa could probably be derived from the - * traffic selectors [rfc4306, p39]. In the netlink kernel implementation - * pluto does the same as we do here but it uses encap_oa in the - * pfkey implementation. BUT as /usr/src/linux/net/key/af_key.c indicates - * the kernel ignores it anyway - * -> does that mean that NAT-T encap doesn't work in transport mode? - * No. The reason the kernel ignores NAT-OA is that it recomputes - * (or, rather, just ignores) the checksum. If packets pass - * the IPsec checks it marks them "checksum ok" so OA isn't needed. */ - rthdr = XFRM_RTA_NEXT(rthdr); - } - - if (mark.value) - { - struct xfrm_mark *mrk; - - rthdr->rta_type = XFRMA_MARK; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark)); - - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - mrk = (struct xfrm_mark*)RTA_DATA(rthdr); - mrk->v = mark.value; - mrk->m = mark.mask; - rthdr = XFRM_RTA_NEXT(rthdr); - } - - if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS) - { - if (mark.value) - { - DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x " - "(mark %u/0x%8x)", ntohl(spi), mark.value, mark.mask); - } - else - { - DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x", ntohl(spi)); - } - return FAILED; - } - return SUCCESS; -} - -/** - * Get the replay state (i.e. sequence numbers) of an SA. - */ -static status_t get_replay_state(private_kernel_netlink_ipsec_t *this, - u_int32_t spi, u_int8_t protocol, host_t *dst, - struct xfrm_replay_state *replay) -{ - netlink_buf_t request; - struct nlmsghdr *hdr, *out = NULL; - struct xfrm_aevent_id *out_aevent = NULL, *aevent_id; - size_t len; - struct rtattr *rta; - size_t rtasize; - - memset(&request, 0, sizeof(request)); - - DBG2(DBG_KNL, "querying replay state from SAD entry with SPI %.8x", ntohl(spi)); - - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST; - hdr->nlmsg_type = XFRM_MSG_GETAE; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id)); - - aevent_id = (struct xfrm_aevent_id*)NLMSG_DATA(hdr); - aevent_id->flags = XFRM_AE_RVAL; - - host2xfrm(dst, &aevent_id->sa_id.daddr); - aevent_id->sa_id.spi = spi; - aevent_id->sa_id.proto = protocol; - aevent_id->sa_id.family = dst->get_family(dst); - - if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS) - { - hdr = out; - while (NLMSG_OK(hdr, len)) - { - switch (hdr->nlmsg_type) - { - case XFRM_MSG_NEWAE: - { - out_aevent = NLMSG_DATA(hdr); - break; - } - case NLMSG_ERROR: - { - struct nlmsgerr *err = NLMSG_DATA(hdr); - DBG1(DBG_KNL, "querying replay state from SAD entry failed: %s (%d)", - strerror(-err->error), -err->error); - break; - } - default: - hdr = NLMSG_NEXT(hdr, len); - continue; - case NLMSG_DONE: - break; - } - break; - } - } - - if (out_aevent == NULL) - { - DBG1(DBG_KNL, "unable to query replay state from SAD entry with SPI %.8x", - ntohl(spi)); - free(out); - return FAILED; - } - - rta = XFRM_RTA(out, struct xfrm_aevent_id); - rtasize = XFRM_PAYLOAD(out, struct xfrm_aevent_id); - while(RTA_OK(rta, rtasize)) - { - if (rta->rta_type == XFRMA_REPLAY_VAL && - RTA_PAYLOAD(rta) == sizeof(struct xfrm_replay_state)) - { - memcpy(replay, RTA_DATA(rta), RTA_PAYLOAD(rta)); - free(out); - return SUCCESS; - } - rta = RTA_NEXT(rta, rtasize); - } - - DBG1(DBG_KNL, "unable to query replay state from SAD entry with SPI %.8x", - ntohl(spi)); - free(out); - return FAILED; -} - -METHOD(kernel_ipsec_t, query_sa, status_t, - private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst, - u_int32_t spi, 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; - size_t len; - - memset(&request, 0, sizeof(request)); - - if (mark.value) - { - DBG2(DBG_KNL, "querying SAD entry with SPI %.8x (mark %u/0x%8x)", - ntohl(spi), mark.value, mark.mask); - } - else - { - DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi)); - } - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST; - hdr->nlmsg_type = XFRM_MSG_GETSA; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id)); - - sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr); - host2xfrm(dst, &sa_id->daddr); - sa_id->spi = spi; - sa_id->proto = protocol; - sa_id->family = dst->get_family(dst); - - if (mark.value) - { - struct xfrm_mark *mrk; - struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_usersa_id); - - rthdr->rta_type = XFRMA_MARK; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark)); - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - mrk = (struct xfrm_mark*)RTA_DATA(rthdr); - mrk->v = mark.value; - mrk->m = mark.mask; - } - - if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS) - { - hdr = out; - while (NLMSG_OK(hdr, len)) - { - switch (hdr->nlmsg_type) - { - case XFRM_MSG_NEWSA: - { - sa = (struct xfrm_usersa_info*)NLMSG_DATA(hdr); - break; - } - case NLMSG_ERROR: - { - struct nlmsgerr *err = NLMSG_DATA(hdr); - - if (mark.value) - { - DBG1(DBG_KNL, "querying SAD entry with SPI %.8x " - "(mark %u/0x%8x) failed: %s (%d)", - ntohl(spi), mark.value, mark.mask, - strerror(-err->error), -err->error); - } - else - { - DBG1(DBG_KNL, "querying SAD entry with SPI %.8x " - "failed: %s (%d)", ntohl(spi), - strerror(-err->error), -err->error); - } - break; - } - default: - hdr = NLMSG_NEXT(hdr, len); - continue; - case NLMSG_DONE: - break; - } - break; - } - } - - if (sa == NULL) - { - DBG2(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi)); - free(out); - return FAILED; - } - *bytes = sa->curlft.bytes; - - free(out); - return SUCCESS; -} - -METHOD(kernel_ipsec_t, del_sa, status_t, - private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst, - u_int32_t spi, 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)); - - if (mark.value) - { - DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x (mark %u/0x%8x)", - ntohl(spi), mark.value, mark.mask); - } - else - { - DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x", ntohl(spi)); - } - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; - hdr->nlmsg_type = XFRM_MSG_DELSA; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id)); - - sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr); - host2xfrm(dst, &sa_id->daddr); - sa_id->spi = spi; - sa_id->proto = protocol; - sa_id->family = dst->get_family(dst); - - if (mark.value) - { - struct xfrm_mark *mrk; - struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_usersa_id); - - rthdr->rta_type = XFRMA_MARK; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark)); - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - mrk = (struct xfrm_mark*)RTA_DATA(rthdr); - mrk->v = mark.value; - mrk->m = mark.mask; - } - - if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS) - { - if (mark.value) - { - DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x " - "(mark %u/0x%8x)", ntohl(spi), mark.value, mark.mask); - } - else - { - DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x", ntohl(spi)); - } - return FAILED; - } - if (mark.value) - { - DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x (mark %u/0x%8x)", - ntohl(spi), mark.value, mark.mask); - } - else - { - DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x", ntohl(spi)); - } - return SUCCESS; -} - -METHOD(kernel_ipsec_t, update_sa, status_t, - private_kernel_netlink_ipsec_t *this, u_int32_t spi, 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; - bool got_replay_state = FALSE; - struct xfrm_replay_state replay; - - /* if IPComp is used, we first update the IPComp SA */ - if (cpi) - { - update_sa(this, htonl(ntohs(cpi)), IPPROTO_COMP, 0, - src, dst, new_src, new_dst, FALSE, FALSE, mark); - } - - memset(&request, 0, sizeof(request)); - - DBG2(DBG_KNL, "querying SAD entry with SPI %.8x for update", ntohl(spi)); - - /* query the existing SA first */ - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST; - hdr->nlmsg_type = XFRM_MSG_GETSA; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id)); - - sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr); - host2xfrm(dst, &sa_id->daddr); - sa_id->spi = spi; - sa_id->proto = protocol; - sa_id->family = dst->get_family(dst); - - if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS) - { - hdr = out; - while (NLMSG_OK(hdr, len)) - { - switch (hdr->nlmsg_type) - { - case XFRM_MSG_NEWSA: - { - out_sa = NLMSG_DATA(hdr); - break; - } - case NLMSG_ERROR: - { - struct nlmsgerr *err = NLMSG_DATA(hdr); - DBG1(DBG_KNL, "querying SAD entry failed: %s (%d)", - strerror(-err->error), -err->error); - break; - } - default: - hdr = NLMSG_NEXT(hdr, len); - continue; - case NLMSG_DONE: - break; - } - break; - } - } - if (out_sa == NULL) - { - DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi)); - free(out); - return FAILED; - } - - /* try to get the replay state */ - if (get_replay_state(this, spi, protocol, dst, &replay) == SUCCESS) - { - got_replay_state = TRUE; - } - - /* delete the old SA (without affecting the IPComp SA) */ - if (del_sa(this, src, dst, spi, protocol, 0, mark) != SUCCESS) - { - DBG1(DBG_KNL, "unable to delete old SAD entry with SPI %.8x", ntohl(spi)); - free(out); - return FAILED; - } - - DBG2(DBG_KNL, "updating SAD entry with SPI %.8x from %#H..%#H to %#H..%#H", - ntohl(spi), src, dst, new_src, new_dst); - /* copy over the SA from out to request */ - hdr = (struct nlmsghdr*)request; - memcpy(hdr, out, min(out->nlmsg_len, sizeof(request))); - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; - hdr->nlmsg_type = XFRM_MSG_NEWSA; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info)); - sa = NLMSG_DATA(hdr); - sa->family = new_dst->get_family(new_dst); - - if (!src->ip_equals(src, new_src)) - { - host2xfrm(new_src, &sa->saddr); - } - if (!dst->ip_equals(dst, new_dst)) - { - host2xfrm(new_dst, &sa->id.daddr); - } - - rta = XFRM_RTA(out, struct xfrm_usersa_info); - rtasize = XFRM_PAYLOAD(out, struct xfrm_usersa_info); - pos = (u_char*)XFRM_RTA(hdr, struct xfrm_usersa_info); - while(RTA_OK(rta, rtasize)) - { - /* copy all attributes, but not XFRMA_ENCAP if we are disabling it */ - if (rta->rta_type != XFRMA_ENCAP || new_encap) - { - if (rta->rta_type == XFRMA_ENCAP) - { /* update encap tmpl */ - tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rta); - tmpl->encap_sport = ntohs(new_src->get_port(new_src)); - tmpl->encap_dport = ntohs(new_dst->get_port(new_dst)); - } - memcpy(pos, rta, rta->rta_len); - pos += RTA_ALIGN(rta->rta_len); - hdr->nlmsg_len += RTA_ALIGN(rta->rta_len); - } - rta = RTA_NEXT(rta, rtasize); - } - - rta = (struct rtattr*)pos; - if (tmpl == NULL && new_encap) - { /* add tmpl if we are enabling it */ - rta->rta_type = XFRMA_ENCAP; - rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_encap_tmpl)); - - hdr->nlmsg_len += rta->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rta); - tmpl->encap_type = UDP_ENCAP_ESPINUDP; - tmpl->encap_sport = ntohs(new_src->get_port(new_src)); - tmpl->encap_dport = ntohs(new_dst->get_port(new_dst)); - memset(&tmpl->encap_oa, 0, sizeof (xfrm_address_t)); - - rta = XFRM_RTA_NEXT(rta); - } - - if (got_replay_state) - { /* copy the replay data if available */ - rta->rta_type = XFRMA_REPLAY_VAL; - rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_replay_state)); - - hdr->nlmsg_len += rta->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - memcpy(RTA_DATA(rta), &replay, sizeof(replay)); - - rta = XFRM_RTA_NEXT(rta); - } - - if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS) - { - DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi)); - free(out); - return FAILED; - } - free(out); - - return SUCCESS; -} - -METHOD(kernel_ipsec_t, add_policy, status_t, - private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst, - traffic_selector_t *src_ts, traffic_selector_t *dst_ts, - policy_dir_t direction, u_int32_t spi, u_int8_t protocol, - u_int32_t reqid, mark_t mark, ipsec_mode_t mode, u_int16_t ipcomp, - u_int16_t cpi, bool routed) -{ - policy_entry_t *current, *policy; - bool found = FALSE; - netlink_buf_t request; - struct xfrm_userpolicy_info *policy_info; - struct nlmsghdr *hdr; - - /* create a policy */ - policy = malloc_thing(policy_entry_t); - memset(policy, 0, sizeof(policy_entry_t)); - policy->sel = ts2selector(src_ts, dst_ts); - policy->mark = mark.value & mark.mask; - policy->direction = direction; - - /* find the policy, which matches EXACTLY */ - this->mutex->lock(this->mutex); - current = this->policies->get(this->policies, policy); - if (current) - { - /* use existing policy */ - current->refcount++; - if (mark.value) - { - DBG2(DBG_KNL, "policy %R === %R %N (mark %u/0x%8x) " - "already exists, increasing refcount", - src_ts, dst_ts, policy_dir_names, direction, - mark.value, mark.mask); - } - else - { - DBG2(DBG_KNL, "policy %R === %R %N " - "already exists, increasing refcount", - src_ts, dst_ts, policy_dir_names, direction); - } - free(policy); - policy = current; - found = TRUE; - } - else - { /* apply the new one, if we have no such policy */ - this->policies->put(this->policies, policy, policy); - policy->refcount = 1; - } - - if (mark.value) - { - DBG2(DBG_KNL, "adding policy %R === %R %N (mark %u/0x%8x)", - src_ts, dst_ts, policy_dir_names, direction, - mark.value, mark.mask); - } - else - { - DBG2(DBG_KNL, "adding policy %R === %R %N", - src_ts, dst_ts, policy_dir_names, direction); - } - - memset(&request, 0, sizeof(request)); - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; - hdr->nlmsg_type = found ? XFRM_MSG_UPDPOLICY : XFRM_MSG_NEWPOLICY; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_info)); - - policy_info = (struct xfrm_userpolicy_info*)NLMSG_DATA(hdr); - policy_info->sel = policy->sel; - policy_info->dir = policy->direction; - /* calculate priority based on source selector size, small size = high prio */ - policy_info->priority = routed ? PRIO_LOW : PRIO_HIGH; - policy_info->priority -= policy->sel.prefixlen_s * 10; - policy_info->priority -= policy->sel.proto ? 2 : 0; - policy_info->priority -= policy->sel.sport_mask ? 1 : 0; - policy_info->action = XFRM_POLICY_ALLOW; - policy_info->share = XFRM_SHARE_ANY; - this->mutex->unlock(this->mutex); - - /* policies don't expire */ - policy_info->lft.soft_byte_limit = XFRM_INF; - policy_info->lft.soft_packet_limit = XFRM_INF; - policy_info->lft.hard_byte_limit = XFRM_INF; - policy_info->lft.hard_packet_limit = XFRM_INF; - policy_info->lft.soft_add_expires_seconds = 0; - policy_info->lft.hard_add_expires_seconds = 0; - policy_info->lft.soft_use_expires_seconds = 0; - policy_info->lft.hard_use_expires_seconds = 0; - - struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_userpolicy_info); - rthdr->rta_type = XFRMA_TMPL; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_user_tmpl)); - - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - struct xfrm_user_tmpl *tmpl = (struct xfrm_user_tmpl*)RTA_DATA(rthdr); - - if (ipcomp != IPCOMP_NONE) - { - tmpl->reqid = reqid; - tmpl->id.proto = IPPROTO_COMP; - tmpl->aalgos = tmpl->ealgos = tmpl->calgos = ~0; - tmpl->mode = mode2kernel(mode); - tmpl->optional = direction != POLICY_OUT; - tmpl->family = src->get_family(src); - - host2xfrm(src, &tmpl->saddr); - host2xfrm(dst, &tmpl->id.daddr); - - /* add an additional xfrm_user_tmpl */ - rthdr->rta_len += RTA_LENGTH(sizeof(struct xfrm_user_tmpl)); - hdr->nlmsg_len += RTA_LENGTH(sizeof(struct xfrm_user_tmpl)); - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - tmpl++; - - /* use transport mode for ESP if we have a tunnel mode IPcomp SA */ - mode = MODE_TRANSPORT; - } - else - { - /* when using IPcomp, only the IPcomp SA uses tmp src/dst addresses */ - host2xfrm(src, &tmpl->saddr); - host2xfrm(dst, &tmpl->id.daddr); - } - - tmpl->reqid = reqid; - tmpl->id.proto = protocol; - tmpl->aalgos = tmpl->ealgos = tmpl->calgos = ~0; - tmpl->mode = mode2kernel(mode); - tmpl->family = src->get_family(src); - rthdr = XFRM_RTA_NEXT(rthdr); - - if (mark.value) - { - struct xfrm_mark *mrk; - - rthdr->rta_type = XFRMA_MARK; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark)); - - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - mrk = (struct xfrm_mark*)RTA_DATA(rthdr); - mrk->v = mark.value; - mrk->m = mark.mask; - } - - if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS) - { - DBG1(DBG_KNL, "unable to add policy %R === %R %N", src_ts, dst_ts, - policy_dir_names, direction); - return FAILED; - } - - /* install a route, if: - * - we are NOT updating a policy - * - this is a forward policy (to just get one for each child) - * - we are in tunnel/BEET mode - * - routing is not disabled via strongswan.conf - */ - if (policy->route == NULL && direction == POLICY_FWD && - mode != MODE_TRANSPORT && this->install_routes) - { - route_entry_t *route = malloc_thing(route_entry_t); - - if (hydra->kernel_interface->get_address_by_ts(hydra->kernel_interface, - 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, src); - /* install route via outgoing interface */ - route->if_name = hydra->kernel_interface->get_interface( - hydra->kernel_interface, dst); - route->dst_net = chunk_alloc(policy->sel.family == AF_INET ? 4 : 16); - memcpy(route->dst_net.ptr, &policy->sel.saddr, route->dst_net.len); - route->prefixlen = policy->sel.prefixlen_s; - - if (route->if_name) - { - switch (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 - { - route_entry_destroy(route); - } - } - else - { - free(route); - } - } - return SUCCESS; -} - -METHOD(kernel_ipsec_t, query_policy, status_t, - private_kernel_netlink_ipsec_t *this, traffic_selector_t *src_ts, - traffic_selector_t *dst_ts, policy_dir_t direction, mark_t mark, - u_int32_t *use_time) -{ - netlink_buf_t request; - struct nlmsghdr *out = NULL, *hdr; - struct xfrm_userpolicy_id *policy_id; - struct xfrm_userpolicy_info *policy = NULL; - size_t len; - - memset(&request, 0, sizeof(request)); - - if (mark.value) - { - DBG2(DBG_KNL, "querying policy %R === %R %N (mark %u/0x%8x)", - src_ts, dst_ts, policy_dir_names, direction, - mark.value, mark.mask); - } - else - { - DBG2(DBG_KNL, "querying policy %R === %R %N", src_ts, dst_ts, - policy_dir_names, direction); - } - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST; - hdr->nlmsg_type = XFRM_MSG_GETPOLICY; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id)); - - policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr); - policy_id->sel = ts2selector(src_ts, dst_ts); - policy_id->dir = direction; - - if (mark.value) - { - struct xfrm_mark *mrk; - struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_userpolicy_id); - - rthdr->rta_type = XFRMA_MARK; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark)); - - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - mrk = (struct xfrm_mark*)RTA_DATA(rthdr); - mrk->v = mark.value; - mrk->m = mark.mask; - } - - if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS) - { - hdr = out; - while (NLMSG_OK(hdr, len)) - { - switch (hdr->nlmsg_type) - { - case XFRM_MSG_NEWPOLICY: - { - policy = (struct xfrm_userpolicy_info*)NLMSG_DATA(hdr); - break; - } - case NLMSG_ERROR: - { - struct nlmsgerr *err = NLMSG_DATA(hdr); - DBG1(DBG_KNL, "querying policy failed: %s (%d)", - strerror(-err->error), -err->error); - break; - } - default: - hdr = NLMSG_NEXT(hdr, len); - continue; - case NLMSG_DONE: - break; - } - break; - } - } - - if (policy == NULL) - { - DBG2(DBG_KNL, "unable to query policy %R === %R %N", src_ts, dst_ts, - policy_dir_names, direction); - free(out); - return FAILED; - } - - if (policy->curlft.use_time) - { - /* we need the monotonic time, but the kernel returns system time. */ - *use_time = time_monotonic(NULL) - (time(NULL) - policy->curlft.use_time); - } - else - { - *use_time = 0; - } - - free(out); - return SUCCESS; -} - -METHOD(kernel_ipsec_t, del_policy, status_t, - private_kernel_netlink_ipsec_t *this, traffic_selector_t *src_ts, - traffic_selector_t *dst_ts, policy_dir_t direction, mark_t mark, - bool unrouted) -{ - policy_entry_t *current, policy, *to_delete = NULL; - route_entry_t *route; - netlink_buf_t request; - struct nlmsghdr *hdr; - struct xfrm_userpolicy_id *policy_id; - - if (mark.value) - { - DBG2(DBG_KNL, "deleting policy %R === %R %N (mark %u/0x%8x)", - src_ts, dst_ts, policy_dir_names, direction, - mark.value, mark.mask); - } - else - { - DBG2(DBG_KNL, "deleting policy %R === %R %N", - src_ts, dst_ts, policy_dir_names, direction); - } - - /* create a policy */ - memset(&policy, 0, sizeof(policy_entry_t)); - policy.sel = ts2selector(src_ts, dst_ts); - policy.mark = mark.value & mark.mask; - policy.direction = direction; - - /* find the policy */ - this->mutex->lock(this->mutex); - current = this->policies->get(this->policies, &policy); - if (current) - { - to_delete = current; - if (--to_delete->refcount > 0) - { - /* is used by more SAs, keep in kernel */ - DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed"); - this->mutex->unlock(this->mutex); - return SUCCESS; - } - /* remove if last reference */ - this->policies->remove(this->policies, to_delete); - } - this->mutex->unlock(this->mutex); - if (!to_delete) - { - if (mark.value) - { - DBG1(DBG_KNL, "deleting policy %R === %R %N (mark %u/0x%8x) " - "failed, not found", src_ts, dst_ts, policy_dir_names, - direction, mark.value, mark.mask); - } - else - { - DBG1(DBG_KNL, "deleting policy %R === %R %N failed, not found", - src_ts, dst_ts, policy_dir_names, direction); - } - return NOT_FOUND; - } - - memset(&request, 0, sizeof(request)); - - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; - hdr->nlmsg_type = XFRM_MSG_DELPOLICY; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id)); - - policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr); - policy_id->sel = to_delete->sel; - policy_id->dir = direction; - - if (mark.value) - { - struct xfrm_mark *mrk; - struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_userpolicy_id); - - rthdr->rta_type = XFRMA_MARK; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark)); - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - mrk = (struct xfrm_mark*)RTA_DATA(rthdr); - mrk->v = mark.value; - mrk->m = mark.mask; - } - - route = to_delete->route; - free(to_delete); - - if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS) - { - if (mark.value) - { - DBG1(DBG_KNL, "unable to delete policy %R === %R %N " - "(mark %u/0x%8x)", src_ts, dst_ts, policy_dir_names, - direction, mark.value, mark.mask); - } - else - { - DBG1(DBG_KNL, "unable to delete policy %R === %R %N", - src_ts, dst_ts, policy_dir_names, direction); - } - return FAILED; - } - - if (route) - { - if (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); - } - route_entry_destroy(route); - } - return SUCCESS; -} - -METHOD(kernel_ipsec_t, bypass_socket, bool, - private_kernel_netlink_ipsec_t *this, int fd, int family) -{ - struct xfrm_userpolicy_info policy; - u_int sol, ipsec_policy; - - switch (family) - { - case AF_INET: - sol = SOL_IP; - ipsec_policy = IP_XFRM_POLICY; - break; - case AF_INET6: - sol = SOL_IPV6; - ipsec_policy = IPV6_XFRM_POLICY; - break; - default: - return FALSE; - } - - memset(&policy, 0, sizeof(policy)); - policy.action = XFRM_POLICY_ALLOW; - policy.sel.family = family; - - policy.dir = XFRM_POLICY_OUT; - if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0) - { - DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s", - strerror(errno)); - return FALSE; - } - policy.dir = XFRM_POLICY_IN; - if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0) - { - DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s", - strerror(errno)); - return FALSE; - } - return TRUE; -} - -METHOD(kernel_ipsec_t, destroy, void, - private_kernel_netlink_ipsec_t *this) -{ - enumerator_t *enumerator; - policy_entry_t *policy; - - if (this->job) - { - this->job->cancel(this->job); - } - if (this->socket_xfrm_events > 0) - { - close(this->socket_xfrm_events); - } - DESTROY_IF(this->socket_xfrm); - enumerator = this->policies->create_enumerator(this->policies); - while (enumerator->enumerate(enumerator, &policy, &policy)) - { - free(policy); - } - enumerator->destroy(enumerator); - this->policies->destroy(this->policies); - this->mutex->destroy(this->mutex); - free(this); -} - -/* - * Described in header. - */ -kernel_netlink_ipsec_t *kernel_netlink_ipsec_create() -{ - private_kernel_netlink_ipsec_t *this; - struct sockaddr_nl addr; - int fd; - - INIT(this, - .public = { - .interface = { - .get_spi = _get_spi, - .get_cpi = _get_cpi, - .add_sa = _add_sa, - .update_sa = _update_sa, - .query_sa = _query_sa, - .del_sa = _del_sa, - .add_policy = _add_policy, - .query_policy = _query_policy, - .del_policy = _del_policy, - .bypass_socket = _bypass_socket, - .destroy = _destroy, - }, - }, - .policies = hashtable_create((hashtable_hash_t)policy_hash, - (hashtable_equals_t)policy_equals, 32), - .mutex = mutex_create(MUTEX_TYPE_DEFAULT), - .install_routes = lib->settings->get_bool(lib->settings, - "charon.install_routes", TRUE), - ); - - /* disable lifetimes for allocated SPIs in kernel */ - fd = open("/proc/sys/net/core/xfrm_acq_expires", O_WRONLY); - if (fd) - { - ignore_result(write(fd, "165", 3)); - close(fd); - } - - this->socket_xfrm = netlink_socket_create(NETLINK_XFRM); - if (!this->socket_xfrm) - { - destroy(this); - return NULL; - } - - memset(&addr, 0, sizeof(addr)); - addr.nl_family = AF_NETLINK; - - /* create and bind XFRM socket for ACQUIRE, EXPIRE, MIGRATE & MAPPING */ - this->socket_xfrm_events = socket(AF_NETLINK, SOCK_RAW, NETLINK_XFRM); - if (this->socket_xfrm_events <= 0) - { - DBG1(DBG_KNL, "unable to create XFRM event socket"); - destroy(this); - return NULL; - } - addr.nl_groups = XFRMNLGRP(ACQUIRE) | XFRMNLGRP(EXPIRE) | - XFRMNLGRP(MIGRATE) | XFRMNLGRP(MAPPING); - if (bind(this->socket_xfrm_events, (struct sockaddr*)&addr, sizeof(addr))) - { - DBG1(DBG_KNL, "unable to bind XFRM event socket"); - destroy(this); - return NULL; - } - this->job = callback_job_create((callback_job_cb_t)receive_events, - this, NULL, NULL); - hydra->processor->queue_job(hydra->processor, (job_t*)this->job); - - return &this->public; -} - diff --git a/src/libcharon/plugins/kernel_netlink/kernel_netlink_ipsec.h b/src/libcharon/plugins/kernel_netlink/kernel_netlink_ipsec.h deleted file mode 100644 index 3a45cce06..000000000 --- a/src/libcharon/plugins/kernel_netlink/kernel_netlink_ipsec.h +++ /dev/null @@ -1,46 +0,0 @@ -/* - * Copyright (C) 2008 Tobias Brunner - * 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. - */ - -/** - * @defgroup kernel_netlink_ipsec_i kernel_netlink_ipsec - * @{ @ingroup kernel_netlink - */ - -#ifndef KERNEL_NETLINK_IPSEC_H_ -#define KERNEL_NETLINK_IPSEC_H_ - -#include <kernel/kernel_ipsec.h> - -typedef struct kernel_netlink_ipsec_t kernel_netlink_ipsec_t; - -/** - * Implementation of the kernel ipsec interface using Netlink. - */ -struct kernel_netlink_ipsec_t { - - /** - * Implements kernel_ipsec_t interface - */ - kernel_ipsec_t interface; -}; - -/** - * Create a netlink kernel ipsec interface instance. - * - * @return kernel_netlink_ipsec_t instance - */ -kernel_netlink_ipsec_t *kernel_netlink_ipsec_create(); - -#endif /** KERNEL_NETLINK_IPSEC_H_ @}*/ diff --git a/src/libcharon/plugins/kernel_netlink/kernel_netlink_net.c b/src/libcharon/plugins/kernel_netlink/kernel_netlink_net.c deleted file mode 100644 index 0beb32d4b..000000000 --- a/src/libcharon/plugins/kernel_netlink/kernel_netlink_net.c +++ /dev/null @@ -1,1519 +0,0 @@ -/* - * Copyright (C) 2008 Tobias Brunner - * Copyright (C) 2005-2008 Martin Willi - * 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. - */ - -/* - * Copyright (C) 2010 secunet Security Networks AG - * Copyright (C) 2010 Thomas Egerer - * - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN - * THE SOFTWARE. - */ - -#include <sys/socket.h> -#include <linux/netlink.h> -#include <linux/rtnetlink.h> -#include <unistd.h> -#include <errno.h> -#include <net/if.h> - -#include "kernel_netlink_net.h" -#include "kernel_netlink_shared.h" - -#include <hydra.h> -#include <daemon.h> -#include <threading/thread.h> -#include <threading/condvar.h> -#include <threading/mutex.h> -#include <utils/linked_list.h> -#include <processing/jobs/callback_job.h> - -/** delay before firing roam events (ms) */ -#define ROAM_DELAY 100 - -typedef struct addr_entry_t addr_entry_t; - -/** - * IP address in an inface_entry_t - */ -struct addr_entry_t { - - /** The ip address */ - host_t *ip; - - /** virtual IP managed by us */ - bool virtual; - - /** scope of the address */ - u_char scope; - - /** Number of times this IP is used, if virtual */ - u_int refcount; -}; - -/** - * destroy a addr_entry_t object - */ -static void addr_entry_destroy(addr_entry_t *this) -{ - this->ip->destroy(this->ip); - free(this); -} - -typedef struct iface_entry_t iface_entry_t; - -/** - * A network interface on this system, containing addr_entry_t's - */ -struct iface_entry_t { - - /** interface index */ - int ifindex; - - /** name of the interface */ - char ifname[IFNAMSIZ]; - - /** interface flags, as in netdevice(7) SIOCGIFFLAGS */ - u_int flags; - - /** list of addresses as host_t */ - linked_list_t *addrs; -}; - -/** - * destroy an interface entry - */ -static void iface_entry_destroy(iface_entry_t *this) -{ - this->addrs->destroy_function(this->addrs, (void*)addr_entry_destroy); - free(this); -} - -typedef struct private_kernel_netlink_net_t private_kernel_netlink_net_t; - -/** - * Private variables and functions of kernel_netlink_net class. - */ -struct private_kernel_netlink_net_t { - /** - * Public part of the kernel_netlink_net_t object. - */ - kernel_netlink_net_t public; - - /** - * mutex to lock access to various lists - */ - mutex_t *mutex; - - /** - * condition variable to signal virtual IP add/removal - */ - condvar_t *condvar; - - /** - * Cached list of interfaces and its addresses (iface_entry_t) - */ - linked_list_t *ifaces; - - /** - * job receiving netlink events - */ - callback_job_t *job; - - /** - * netlink rt socket (routing) - */ - netlink_socket_t *socket; - - /** - * Netlink rt socket to receive address change events - */ - int socket_events; - - /** - * time of the last roam event - */ - timeval_t last_roam; - - /** - * routing table to install routes - */ - int routing_table; - - /** - * priority of used routing table - */ - int routing_table_prio; - - /** - * whether to react to RTM_NEWROUTE or RTM_DELROUTE events - */ - bool process_route; - - /** - * whether to actually install virtual IPs - */ - bool install_virtual_ip; - - /** - * list with routing tables to be excluded from route lookup - */ - linked_list_t *rt_exclude; -}; - -/** - * get the refcount of a virtual ip - */ -static int get_vip_refcount(private_kernel_netlink_net_t *this, host_t* ip) -{ - iterator_t *ifaces, *addrs; - iface_entry_t *iface; - addr_entry_t *addr; - int refcount = 0; - - ifaces = this->ifaces->create_iterator(this->ifaces, TRUE); - while (ifaces->iterate(ifaces, (void**)&iface)) - { - addrs = iface->addrs->create_iterator(iface->addrs, TRUE); - while (addrs->iterate(addrs, (void**)&addr)) - { - if (addr->virtual && (iface->flags & IFF_UP) && - ip->ip_equals(ip, addr->ip)) - { - refcount = addr->refcount; - break; - } - } - addrs->destroy(addrs); - if (refcount) - { - break; - } - } - ifaces->destroy(ifaces); - - return refcount; -} - -/** - * callback function that raises the delayed roam event - */ -static job_requeue_t roam_event(uintptr_t address) -{ - hydra->kernel_interface->roam(hydra->kernel_interface, address != 0); - return JOB_REQUEUE_NONE; -} - -/** - * fire a roaming event. we delay it for a bit and fire only one event - * for multiple calls. otherwise we would create too many events. - */ -static void fire_roam_event(private_kernel_netlink_net_t *this, bool address) -{ - timeval_t now; - job_t *job; - - time_monotonic(&now); - if (timercmp(&now, &this->last_roam, >)) - { - now.tv_usec += ROAM_DELAY * 1000; - while (now.tv_usec > 1000000) - { - now.tv_sec++; - now.tv_usec -= 1000000; - } - this->last_roam = now; - - job = (job_t*)callback_job_create((callback_job_cb_t)roam_event, - (void*)(uintptr_t)(address ? 1 : 0), - NULL, NULL); - hydra->scheduler->schedule_job_ms(hydra->scheduler, job, ROAM_DELAY); - } -} - -/** - * process RTM_NEWLINK/RTM_DELLINK from kernel - */ -static void process_link(private_kernel_netlink_net_t *this, - struct nlmsghdr *hdr, bool event) -{ - struct ifinfomsg* msg = (struct ifinfomsg*)(NLMSG_DATA(hdr)); - struct rtattr *rta = IFLA_RTA(msg); - size_t rtasize = IFLA_PAYLOAD (hdr); - enumerator_t *enumerator; - iface_entry_t *current, *entry = NULL; - char *name = NULL; - bool update = FALSE; - - while(RTA_OK(rta, rtasize)) - { - switch (rta->rta_type) - { - case IFLA_IFNAME: - name = RTA_DATA(rta); - break; - } - rta = RTA_NEXT(rta, rtasize); - } - if (!name) - { - name = "(unknown)"; - } - - this->mutex->lock(this->mutex); - switch (hdr->nlmsg_type) - { - case RTM_NEWLINK: - { - if (msg->ifi_flags & IFF_LOOPBACK) - { /* ignore loopback interfaces */ - break; - } - enumerator = this->ifaces->create_enumerator(this->ifaces); - while (enumerator->enumerate(enumerator, ¤t)) - { - if (current->ifindex == msg->ifi_index) - { - entry = current; - break; - } - } - enumerator->destroy(enumerator); - if (!entry) - { - entry = malloc_thing(iface_entry_t); - entry->ifindex = msg->ifi_index; - entry->flags = 0; - entry->addrs = linked_list_create(); - this->ifaces->insert_last(this->ifaces, entry); - } - memcpy(entry->ifname, name, IFNAMSIZ); - entry->ifname[IFNAMSIZ-1] = '\0'; - if (event) - { - if (!(entry->flags & IFF_UP) && (msg->ifi_flags & IFF_UP)) - { - update = TRUE; - DBG1(DBG_KNL, "interface %s activated", name); - } - if ((entry->flags & IFF_UP) && !(msg->ifi_flags & IFF_UP)) - { - update = TRUE; - DBG1(DBG_KNL, "interface %s deactivated", name); - } - } - entry->flags = msg->ifi_flags; - break; - } - case RTM_DELLINK: - { - enumerator = this->ifaces->create_enumerator(this->ifaces); - while (enumerator->enumerate(enumerator, ¤t)) - { - if (current->ifindex == msg->ifi_index) - { - /* we do not remove it, as an address may be added to a - * "down" interface and we wan't to know that. */ - current->flags = msg->ifi_flags; - break; - } - } - enumerator->destroy(enumerator); - break; - } - } - this->mutex->unlock(this->mutex); - - /* send an update to all IKE_SAs */ - if (update && event) - { - fire_roam_event(this, TRUE); - } -} - -/** - * process RTM_NEWADDR/RTM_DELADDR from kernel - */ -static void process_addr(private_kernel_netlink_net_t *this, - struct nlmsghdr *hdr, bool event) -{ - struct ifaddrmsg* msg = (struct ifaddrmsg*)(NLMSG_DATA(hdr)); - struct rtattr *rta = IFA_RTA(msg); - size_t rtasize = IFA_PAYLOAD (hdr); - host_t *host = NULL; - enumerator_t *ifaces, *addrs; - iface_entry_t *iface; - addr_entry_t *addr; - chunk_t local = chunk_empty, address = chunk_empty; - bool update = FALSE, found = FALSE, changed = FALSE; - - while(RTA_OK(rta, rtasize)) - { - switch (rta->rta_type) - { - case IFA_LOCAL: - local.ptr = RTA_DATA(rta); - local.len = RTA_PAYLOAD(rta); - break; - case IFA_ADDRESS: - address.ptr = RTA_DATA(rta); - address.len = RTA_PAYLOAD(rta); - break; - } - rta = RTA_NEXT(rta, rtasize); - } - - /* For PPP interfaces, we need the IFA_LOCAL address, - * IFA_ADDRESS is the peers address. But IFA_LOCAL is - * not included in all cases (IPv6?), so fallback to IFA_ADDRESS. */ - if (local.ptr) - { - host = host_create_from_chunk(msg->ifa_family, local, 0); - } - else if (address.ptr) - { - host = host_create_from_chunk(msg->ifa_family, address, 0); - } - - if (host == NULL) - { /* bad family? */ - return; - } - - this->mutex->lock(this->mutex); - ifaces = this->ifaces->create_enumerator(this->ifaces); - while (ifaces->enumerate(ifaces, &iface)) - { - if (iface->ifindex == msg->ifa_index) - { - addrs = iface->addrs->create_enumerator(iface->addrs); - while (addrs->enumerate(addrs, &addr)) - { - if (host->ip_equals(host, addr->ip)) - { - found = TRUE; - if (hdr->nlmsg_type == RTM_DELADDR) - { - iface->addrs->remove_at(iface->addrs, addrs); - if (!addr->virtual) - { - changed = TRUE; - DBG1(DBG_KNL, "%H disappeared from %s", - host, iface->ifname); - } - addr_entry_destroy(addr); - } - else if (hdr->nlmsg_type == RTM_NEWADDR && addr->virtual) - { - addr->refcount = 1; - } - } - } - addrs->destroy(addrs); - - if (hdr->nlmsg_type == RTM_NEWADDR) - { - if (!found) - { - found = TRUE; - changed = TRUE; - addr = malloc_thing(addr_entry_t); - addr->ip = host->clone(host); - addr->virtual = FALSE; - addr->refcount = 1; - addr->scope = msg->ifa_scope; - - iface->addrs->insert_last(iface->addrs, addr); - if (event) - { - DBG1(DBG_KNL, "%H appeared on %s", host, iface->ifname); - } - } - } - if (found && (iface->flags & IFF_UP)) - { - update = TRUE; - } - break; - } - } - ifaces->destroy(ifaces); - this->mutex->unlock(this->mutex); - host->destroy(host); - - /* send an update to all IKE_SAs */ - if (update && event && changed) - { - fire_roam_event(this, TRUE); - } -} - -/** - * process RTM_NEWROUTE and RTM_DELROUTE from kernel - */ -static void process_route(private_kernel_netlink_net_t *this, struct nlmsghdr *hdr) -{ - struct rtmsg* msg = (struct rtmsg*)(NLMSG_DATA(hdr)); - struct rtattr *rta = RTM_RTA(msg); - size_t rtasize = RTM_PAYLOAD(hdr); - host_t *host = NULL; - - /* ignore routes added by us */ - if (msg->rtm_table && msg->rtm_table == this->routing_table) - { - return; - } - - while (RTA_OK(rta, rtasize)) - { - switch (rta->rta_type) - { - case RTA_PREFSRC: - host = host_create_from_chunk(msg->rtm_family, - chunk_create(RTA_DATA(rta), RTA_PAYLOAD(rta)), 0); - break; - } - rta = RTA_NEXT(rta, rtasize); - } - if (host) - { - this->mutex->lock(this->mutex); - if (!get_vip_refcount(this, host)) - { /* ignore routes added for virtual IPs */ - fire_roam_event(this, FALSE); - } - this->mutex->unlock(this->mutex); - host->destroy(host); - } -} - -/** - * Receives events from kernel - */ -static job_requeue_t receive_events(private_kernel_netlink_net_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_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 rt 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)) - { - /* looks good so far, dispatch netlink message */ - switch (hdr->nlmsg_type) - { - case RTM_NEWADDR: - case RTM_DELADDR: - process_addr(this, hdr, TRUE); - this->condvar->broadcast(this->condvar); - break; - case RTM_NEWLINK: - case RTM_DELLINK: - process_link(this, hdr, TRUE); - this->condvar->broadcast(this->condvar); - break; - case RTM_NEWROUTE: - case RTM_DELROUTE: - if (this->process_route) - { - process_route(this, hdr); - } - break; - default: - break; - } - hdr = NLMSG_NEXT(hdr, len); - } - return JOB_REQUEUE_DIRECT; -} - -/** enumerator over addresses */ -typedef struct { - private_kernel_netlink_net_t* this; - /** whether to enumerate down interfaces */ - bool include_down_ifaces; - /** whether to enumerate virtual ip addresses */ - bool include_virtual_ips; -} address_enumerator_t; - -/** - * cleanup function for address enumerator - */ -static void address_enumerator_destroy(address_enumerator_t *data) -{ - data->this->mutex->unlock(data->this->mutex); - free(data); -} - -/** - * filter for addresses - */ -static bool filter_addresses(address_enumerator_t *data, addr_entry_t** in, host_t** out) -{ - if (!data->include_virtual_ips && (*in)->virtual) - { /* skip virtual interfaces added by us */ - return FALSE; - } - if ((*in)->scope >= RT_SCOPE_LINK) - { /* skip addresses with a unusable scope */ - return FALSE; - } - *out = (*in)->ip; - return TRUE; -} - -/** - * enumerator constructor for interfaces - */ -static enumerator_t *create_iface_enumerator(iface_entry_t *iface, address_enumerator_t *data) -{ - return enumerator_create_filter(iface->addrs->create_enumerator(iface->addrs), - (void*)filter_addresses, data, NULL); -} - -/** - * filter for interfaces - */ -static bool filter_interfaces(address_enumerator_t *data, iface_entry_t** in, iface_entry_t** out) -{ - if (!data->include_down_ifaces && !((*in)->flags & IFF_UP)) - { /* skip interfaces not up */ - return FALSE; - } - *out = *in; - return TRUE; -} - -/** - * implementation of kernel_net_t.create_address_enumerator - */ -static enumerator_t *create_address_enumerator(private_kernel_netlink_net_t *this, - bool include_down_ifaces, bool include_virtual_ips) -{ - address_enumerator_t *data = malloc_thing(address_enumerator_t); - data->this = this; - data->include_down_ifaces = include_down_ifaces; - data->include_virtual_ips = include_virtual_ips; - - this->mutex->lock(this->mutex); - return enumerator_create_nested( - enumerator_create_filter(this->ifaces->create_enumerator(this->ifaces), - (void*)filter_interfaces, data, NULL), - (void*)create_iface_enumerator, data, (void*)address_enumerator_destroy); -} - -/** - * implementation of kernel_net_t.get_interface_name - */ -static char *get_interface_name(private_kernel_netlink_net_t *this, host_t* ip) -{ - enumerator_t *ifaces, *addrs; - iface_entry_t *iface; - addr_entry_t *addr; - char *name = NULL; - - DBG2(DBG_KNL, "getting interface name for %H", ip); - - this->mutex->lock(this->mutex); - ifaces = this->ifaces->create_enumerator(this->ifaces); - while (ifaces->enumerate(ifaces, &iface)) - { - addrs = iface->addrs->create_enumerator(iface->addrs); - while (addrs->enumerate(addrs, &addr)) - { - if (ip->ip_equals(ip, addr->ip)) - { - name = strdup(iface->ifname); - break; - } - } - addrs->destroy(addrs); - if (name) - { - break; - } - } - ifaces->destroy(ifaces); - this->mutex->unlock(this->mutex); - - if (name) - { - DBG2(DBG_KNL, "%H is on interface %s", ip, name); - } - else - { - DBG2(DBG_KNL, "%H is not a local address", ip); - } - return name; -} - -/** - * get the index of an interface by name - */ -static int get_interface_index(private_kernel_netlink_net_t *this, char* name) -{ - enumerator_t *ifaces; - iface_entry_t *iface; - int ifindex = 0; - - DBG2(DBG_KNL, "getting iface index for %s", name); - - this->mutex->lock(this->mutex); - ifaces = this->ifaces->create_enumerator(this->ifaces); - while (ifaces->enumerate(ifaces, &iface)) - { - if (streq(name, iface->ifname)) - { - ifindex = iface->ifindex; - break; - } - } - ifaces->destroy(ifaces); - this->mutex->unlock(this->mutex); - - if (ifindex == 0) - { - DBG1(DBG_KNL, "unable to get interface index for %s", name); - } - return ifindex; -} - -/** - * Check if an interface with a given index is up - */ -static bool is_interface_up(private_kernel_netlink_net_t *this, int index) -{ - enumerator_t *ifaces; - iface_entry_t *iface; - /* default to TRUE for interface we do not monitor (e.g. lo) */ - bool up = TRUE; - - ifaces = this->ifaces->create_enumerator(this->ifaces); - while (ifaces->enumerate(ifaces, &iface)) - { - if (iface->ifindex == index) - { - up = iface->flags & IFF_UP; - break; - } - } - ifaces->destroy(ifaces); - return up; -} - -/** - * check if an address (chunk) addr is in subnet (net with net_len net bits) - */ -static bool addr_in_subnet(chunk_t addr, chunk_t net, int net_len) -{ - static const u_char mask[] = { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe }; - int byte = 0; - - if (net_len == 0) - { /* any address matches a /0 network */ - return TRUE; - } - if (addr.len != net.len || net_len > 8 * net.len ) - { - return FALSE; - } - /* scan through all bytes in network order */ - while (net_len > 0) - { - if (net_len < 8) - { - return (mask[net_len] & addr.ptr[byte]) == (mask[net_len] & net.ptr[byte]); - } - else - { - if (addr.ptr[byte] != net.ptr[byte]) - { - return FALSE; - } - byte++; - net_len -= 8; - } - } - return TRUE; -} - -/** - * Get a route: If "nexthop", the nexthop is returned. source addr otherwise. - */ -static host_t *get_route(private_kernel_netlink_net_t *this, host_t *dest, - bool nexthop, host_t *candidate) -{ - netlink_buf_t request; - struct nlmsghdr *hdr, *out, *current; - struct rtmsg *msg; - chunk_t chunk; - size_t len; - int best = -1; - enumerator_t *enumerator; - host_t *src = NULL, *gtw = NULL; - - DBG2(DBG_KNL, "getting address to reach %H", dest); - - memset(&request, 0, sizeof(request)); - - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST; - if (dest->get_family(dest) == AF_INET) - { - /* We dump all addresses for IPv4, as we want to ignore IPsec specific - * routes installed by us. But the kernel does not return source - * addresses in a IPv6 dump, so fall back to get() for v6 routes. */ - hdr->nlmsg_flags |= NLM_F_ROOT | NLM_F_DUMP; - } - hdr->nlmsg_type = RTM_GETROUTE; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); - - msg = (struct rtmsg*)NLMSG_DATA(hdr); - msg->rtm_family = dest->get_family(dest); - if (candidate) - { - chunk = candidate->get_address(candidate); - netlink_add_attribute(hdr, RTA_PREFSRC, chunk, sizeof(request)); - } - chunk = dest->get_address(dest); - netlink_add_attribute(hdr, RTA_DST, chunk, sizeof(request)); - - if (this->socket->send(this->socket, hdr, &out, &len) != SUCCESS) - { - DBG1(DBG_KNL, "getting address to %H failed", dest); - return NULL; - } - this->mutex->lock(this->mutex); - - for (current = out; NLMSG_OK(current, len); - current = NLMSG_NEXT(current, len)) - { - switch (current->nlmsg_type) - { - case NLMSG_DONE: - break; - case RTM_NEWROUTE: - { - struct rtattr *rta; - size_t rtasize; - chunk_t rta_gtw, rta_src, rta_dst; - u_int32_t rta_oif = 0; - host_t *new_src, *new_gtw; - bool cont = FALSE; - uintptr_t table; - - rta_gtw = rta_src = rta_dst = chunk_empty; - msg = (struct rtmsg*)(NLMSG_DATA(current)); - rta = RTM_RTA(msg); - rtasize = RTM_PAYLOAD(current); - while (RTA_OK(rta, rtasize)) - { - switch (rta->rta_type) - { - case RTA_PREFSRC: - rta_src = chunk_create(RTA_DATA(rta), RTA_PAYLOAD(rta)); - break; - case RTA_GATEWAY: - rta_gtw = chunk_create(RTA_DATA(rta), RTA_PAYLOAD(rta)); - break; - case RTA_DST: - rta_dst = chunk_create(RTA_DATA(rta), RTA_PAYLOAD(rta)); - break; - case RTA_OIF: - if (RTA_PAYLOAD(rta) == sizeof(rta_oif)) - { - rta_oif = *(u_int32_t*)RTA_DATA(rta); - } - break; - } - rta = RTA_NEXT(rta, rtasize); - } - if (msg->rtm_dst_len <= best) - { /* not better than a previous one */ - continue; - } - enumerator = this->rt_exclude->create_enumerator(this->rt_exclude); - while (enumerator->enumerate(enumerator, &table)) - { - if (table == msg->rtm_table) - { - cont = TRUE; - break; - } - } - enumerator->destroy(enumerator); - if (cont) - { - continue; - } - if (this->routing_table != 0 && - msg->rtm_table == this->routing_table) - { /* route is from our own ipsec routing table */ - continue; - } - if (rta_oif && !is_interface_up(this, rta_oif)) - { /* interface is down */ - continue; - } - if (!addr_in_subnet(chunk, rta_dst, msg->rtm_dst_len)) - { /* route destination does not contain dest */ - continue; - } - - if (nexthop) - { - /* nexthop lookup, return gateway if any */ - DESTROY_IF(gtw); - gtw = host_create_from_chunk(msg->rtm_family, rta_gtw, 0); - best = msg->rtm_dst_len; - continue; - } - if (rta_src.ptr) - { - /* got a source address */ - new_src = host_create_from_chunk(msg->rtm_family, rta_src, 0); - if (new_src) - { - if (get_vip_refcount(this, new_src)) - { /* skip source address if it is installed by us */ - new_src->destroy(new_src); - } - else - { - DESTROY_IF(src); - src = new_src; - best = msg->rtm_dst_len; - } - } - continue; - } - if (rta_gtw.ptr) - { /* no source, but a gateway. Lookup source to reach gtw. */ - new_gtw = host_create_from_chunk(msg->rtm_family, rta_gtw, 0); - new_src = get_route(this, new_gtw, FALSE, candidate); - new_gtw->destroy(new_gtw); - if (new_src) - { - DESTROY_IF(src); - src = new_src; - best = msg->rtm_dst_len; - } - continue; - } - continue; - } - default: - continue; - } - break; - } - free(out); - this->mutex->unlock(this->mutex); - - if (nexthop) - { - if (gtw) - { - return gtw; - } - return dest->clone(dest); - } - return src; -} - -/** - * Implementation of kernel_net_t.get_source_addr. - */ -static host_t* get_source_addr(private_kernel_netlink_net_t *this, - host_t *dest, host_t *src) -{ - return get_route(this, dest, FALSE, src); -} - -/** - * Implementation of kernel_net_t.get_nexthop. - */ -static host_t* get_nexthop(private_kernel_netlink_net_t *this, host_t *dest) -{ - return get_route(this, dest, TRUE, NULL); -} - -/** - * Manages the creation and deletion of ip addresses on an interface. - * By setting the appropriate nlmsg_type, the ip will be set or unset. - */ -static status_t manage_ipaddr(private_kernel_netlink_net_t *this, int nlmsg_type, - int flags, int if_index, host_t *ip) -{ - netlink_buf_t request; - struct nlmsghdr *hdr; - struct ifaddrmsg *msg; - chunk_t chunk; - - memset(&request, 0, sizeof(request)); - - chunk = ip->get_address(ip); - - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags; - hdr->nlmsg_type = nlmsg_type; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)); - - msg = (struct ifaddrmsg*)NLMSG_DATA(hdr); - msg->ifa_family = ip->get_family(ip); - msg->ifa_flags = 0; - msg->ifa_prefixlen = 8 * chunk.len; - msg->ifa_scope = RT_SCOPE_UNIVERSE; - msg->ifa_index = if_index; - - netlink_add_attribute(hdr, IFA_LOCAL, chunk, sizeof(request)); - - return this->socket->send_ack(this->socket, hdr); -} - -/** - * Implementation of kernel_net_t.add_ip. - */ -static status_t add_ip(private_kernel_netlink_net_t *this, - host_t *virtual_ip, host_t *iface_ip) -{ - iface_entry_t *iface; - addr_entry_t *addr; - enumerator_t *addrs, *ifaces; - int ifindex; - - if (!this->install_virtual_ip) - { /* disabled by config */ - return SUCCESS; - } - - DBG2(DBG_KNL, "adding virtual IP %H", virtual_ip); - - this->mutex->lock(this->mutex); - ifaces = this->ifaces->create_enumerator(this->ifaces); - while (ifaces->enumerate(ifaces, &iface)) - { - bool iface_found = FALSE; - - addrs = iface->addrs->create_enumerator(iface->addrs); - while (addrs->enumerate(addrs, &addr)) - { - if (iface_ip->ip_equals(iface_ip, addr->ip)) - { - iface_found = TRUE; - } - else if (virtual_ip->ip_equals(virtual_ip, addr->ip)) - { - addr->refcount++; - DBG2(DBG_KNL, "virtual IP %H already installed on %s", - virtual_ip, iface->ifname); - addrs->destroy(addrs); - ifaces->destroy(ifaces); - this->mutex->unlock(this->mutex); - return SUCCESS; - } - } - addrs->destroy(addrs); - - if (iface_found) - { - ifindex = iface->ifindex; - addr = malloc_thing(addr_entry_t); - addr->ip = virtual_ip->clone(virtual_ip); - addr->refcount = 0; - addr->virtual = TRUE; - addr->scope = RT_SCOPE_UNIVERSE; - iface->addrs->insert_last(iface->addrs, addr); - - if (manage_ipaddr(this, RTM_NEWADDR, NLM_F_CREATE | NLM_F_EXCL, - ifindex, virtual_ip) == SUCCESS) - { - while (get_vip_refcount(this, virtual_ip) == 0) - { /* wait until address appears */ - this->condvar->wait(this->condvar, this->mutex); - } - ifaces->destroy(ifaces); - this->mutex->unlock(this->mutex); - return SUCCESS; - } - ifaces->destroy(ifaces); - this->mutex->unlock(this->mutex); - DBG1(DBG_KNL, "adding virtual IP %H failed", virtual_ip); - return FAILED; - } - } - ifaces->destroy(ifaces); - this->mutex->unlock(this->mutex); - - DBG1(DBG_KNL, "interface address %H not found, unable to install" - "virtual IP %H", iface_ip, virtual_ip); - return FAILED; -} - -/** - * Implementation of kernel_net_t.del_ip. - */ -static status_t del_ip(private_kernel_netlink_net_t *this, host_t *virtual_ip) -{ - iface_entry_t *iface; - addr_entry_t *addr; - enumerator_t *addrs, *ifaces; - status_t status; - int ifindex; - - if (!this->install_virtual_ip) - { /* disabled by config */ - return SUCCESS; - } - - DBG2(DBG_KNL, "deleting virtual IP %H", virtual_ip); - - this->mutex->lock(this->mutex); - ifaces = this->ifaces->create_enumerator(this->ifaces); - while (ifaces->enumerate(ifaces, &iface)) - { - addrs = iface->addrs->create_enumerator(iface->addrs); - while (addrs->enumerate(addrs, &addr)) - { - if (virtual_ip->ip_equals(virtual_ip, addr->ip)) - { - ifindex = iface->ifindex; - if (addr->refcount == 1) - { - status = manage_ipaddr(this, RTM_DELADDR, 0, - ifindex, virtual_ip); - if (status == SUCCESS) - { /* wait until the address is really gone */ - while (get_vip_refcount(this, virtual_ip) > 0) - { - this->condvar->wait(this->condvar, this->mutex); - } - } - addrs->destroy(addrs); - ifaces->destroy(ifaces); - this->mutex->unlock(this->mutex); - return status; - } - else - { - addr->refcount--; - } - DBG2(DBG_KNL, "virtual IP %H used by other SAs, not deleting", - virtual_ip); - addrs->destroy(addrs); - ifaces->destroy(ifaces); - this->mutex->unlock(this->mutex); - return SUCCESS; - } - } - addrs->destroy(addrs); - } - ifaces->destroy(ifaces); - this->mutex->unlock(this->mutex); - - DBG2(DBG_KNL, "virtual IP %H not cached, unable to delete", virtual_ip); - return FAILED; -} - -/** - * Manages source routes in the routing table. - * By setting the appropriate nlmsg_type, the route gets added or removed. - */ -static status_t manage_srcroute(private_kernel_netlink_net_t *this, int nlmsg_type, - int flags, chunk_t dst_net, u_int8_t prefixlen, - host_t *gateway, host_t *src_ip, char *if_name) -{ - netlink_buf_t request; - struct nlmsghdr *hdr; - struct rtmsg *msg; - int ifindex; - chunk_t chunk; - - /* if route is 0.0.0.0/0, we can't install it, as it would - * overwrite the default route. Instead, we add two routes: - * 0.0.0.0/1 and 128.0.0.0/1 */ - if (this->routing_table == 0 && prefixlen == 0) - { - chunk_t half_net; - u_int8_t half_prefixlen; - status_t status; - - half_net = chunk_alloca(dst_net.len); - memset(half_net.ptr, 0, half_net.len); - half_prefixlen = 1; - - status = manage_srcroute(this, nlmsg_type, flags, half_net, half_prefixlen, - gateway, src_ip, if_name); - half_net.ptr[0] |= 0x80; - status = manage_srcroute(this, nlmsg_type, flags, half_net, half_prefixlen, - gateway, src_ip, if_name); - return status; - } - - memset(&request, 0, sizeof(request)); - - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags; - hdr->nlmsg_type = nlmsg_type; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); - - msg = (struct rtmsg*)NLMSG_DATA(hdr); - msg->rtm_family = src_ip->get_family(src_ip); - msg->rtm_dst_len = prefixlen; - msg->rtm_table = this->routing_table; - msg->rtm_protocol = RTPROT_STATIC; - msg->rtm_type = RTN_UNICAST; - msg->rtm_scope = RT_SCOPE_UNIVERSE; - - netlink_add_attribute(hdr, RTA_DST, dst_net, sizeof(request)); - chunk = src_ip->get_address(src_ip); - netlink_add_attribute(hdr, RTA_PREFSRC, chunk, sizeof(request)); - if (gateway && gateway->get_family(gateway) == src_ip->get_family(src_ip)) - { - chunk = gateway->get_address(gateway); - netlink_add_attribute(hdr, RTA_GATEWAY, chunk, sizeof(request)); - } - ifindex = get_interface_index(this, if_name); - chunk.ptr = (char*)&ifindex; - chunk.len = sizeof(ifindex); - netlink_add_attribute(hdr, RTA_OIF, chunk, sizeof(request)); - - return this->socket->send_ack(this->socket, hdr); -} - -/** - * Implementation of kernel_net_t.add_route. - */ -static status_t add_route(private_kernel_netlink_net_t *this, chunk_t dst_net, - u_int8_t prefixlen, host_t *gateway, host_t *src_ip, char *if_name) -{ - return manage_srcroute(this, RTM_NEWROUTE, NLM_F_CREATE | NLM_F_EXCL, - dst_net, prefixlen, gateway, src_ip, if_name); -} - -/** - * Implementation of kernel_net_t.del_route. - */ -static status_t del_route(private_kernel_netlink_net_t *this, chunk_t dst_net, - u_int8_t prefixlen, host_t *gateway, host_t *src_ip, char *if_name) -{ - return manage_srcroute(this, RTM_DELROUTE, 0, dst_net, prefixlen, - gateway, src_ip, if_name); -} - -/** - * Initialize a list of local addresses. - */ -static status_t init_address_list(private_kernel_netlink_net_t *this) -{ - netlink_buf_t request; - struct nlmsghdr *out, *current, *in; - struct rtgenmsg *msg; - size_t len; - enumerator_t *ifaces, *addrs; - iface_entry_t *iface; - addr_entry_t *addr; - - DBG1(DBG_KNL, "listening on interfaces:"); - - memset(&request, 0, sizeof(request)); - - in = (struct nlmsghdr*)&request; - in->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg)); - in->nlmsg_flags = NLM_F_REQUEST | NLM_F_MATCH | NLM_F_ROOT; - msg = (struct rtgenmsg*)NLMSG_DATA(in); - msg->rtgen_family = AF_UNSPEC; - - /* get all links */ - in->nlmsg_type = RTM_GETLINK; - if (this->socket->send(this->socket, in, &out, &len) != SUCCESS) - { - return FAILED; - } - current = out; - while (NLMSG_OK(current, len)) - { - switch (current->nlmsg_type) - { - case NLMSG_DONE: - break; - case RTM_NEWLINK: - process_link(this, current, FALSE); - /* fall through */ - default: - current = NLMSG_NEXT(current, len); - continue; - } - break; - } - free(out); - - /* get all interface addresses */ - in->nlmsg_type = RTM_GETADDR; - if (this->socket->send(this->socket, in, &out, &len) != SUCCESS) - { - return FAILED; - } - current = out; - while (NLMSG_OK(current, len)) - { - switch (current->nlmsg_type) - { - case NLMSG_DONE: - break; - case RTM_NEWADDR: - process_addr(this, current, FALSE); - /* fall through */ - default: - current = NLMSG_NEXT(current, len); - continue; - } - break; - } - free(out); - - this->mutex->lock(this->mutex); - ifaces = this->ifaces->create_enumerator(this->ifaces); - while (ifaces->enumerate(ifaces, &iface)) - { - if (iface->flags & IFF_UP) - { - DBG1(DBG_KNL, " %s", iface->ifname); - addrs = iface->addrs->create_enumerator(iface->addrs); - while (addrs->enumerate(addrs, (void**)&addr)) - { - DBG1(DBG_KNL, " %H", addr->ip); - } - addrs->destroy(addrs); - } - } - ifaces->destroy(ifaces); - this->mutex->unlock(this->mutex); - return SUCCESS; -} - -/** - * create or delete a rule to use our routing table - */ -static status_t manage_rule(private_kernel_netlink_net_t *this, int nlmsg_type, - int family, u_int32_t table, u_int32_t prio) -{ - netlink_buf_t request; - struct nlmsghdr *hdr; - struct rtmsg *msg; - chunk_t chunk; - - memset(&request, 0, sizeof(request)); - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; - hdr->nlmsg_type = nlmsg_type; - if (nlmsg_type == RTM_NEWRULE) - { - hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL; - } - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); - - msg = (struct rtmsg*)NLMSG_DATA(hdr); - msg->rtm_table = table; - msg->rtm_family = family; - msg->rtm_protocol = RTPROT_BOOT; - msg->rtm_scope = RT_SCOPE_UNIVERSE; - msg->rtm_type = RTN_UNICAST; - - chunk = chunk_from_thing(prio); - netlink_add_attribute(hdr, RTA_PRIORITY, chunk, sizeof(request)); - - return this->socket->send_ack(this->socket, hdr); -} - -/** - * Implementation of kernel_netlink_net_t.destroy. - */ -static void destroy(private_kernel_netlink_net_t *this) -{ - if (this->routing_table) - { - manage_rule(this, RTM_DELRULE, AF_INET, this->routing_table, - this->routing_table_prio); - manage_rule(this, RTM_DELRULE, AF_INET6, this->routing_table, - this->routing_table_prio); - } - if (this->job) - { - this->job->cancel(this->job); - } - if (this->socket_events > 0) - { - close(this->socket_events); - } - DESTROY_IF(this->socket); - this->ifaces->destroy_function(this->ifaces, (void*)iface_entry_destroy); - this->rt_exclude->destroy(this->rt_exclude); - this->condvar->destroy(this->condvar); - this->mutex->destroy(this->mutex); - free(this); -} - -/* - * Described in header. - */ -kernel_netlink_net_t *kernel_netlink_net_create() -{ - private_kernel_netlink_net_t *this = malloc_thing(private_kernel_netlink_net_t); - struct sockaddr_nl addr; - enumerator_t *enumerator; - char *exclude; - - /* public functions */ - this->public.interface.get_interface = (char*(*)(kernel_net_t*,host_t*))get_interface_name; - this->public.interface.create_address_enumerator = (enumerator_t*(*)(kernel_net_t*,bool,bool))create_address_enumerator; - this->public.interface.get_source_addr = (host_t*(*)(kernel_net_t*, host_t *dest, host_t *src))get_source_addr; - this->public.interface.get_nexthop = (host_t*(*)(kernel_net_t*, host_t *dest))get_nexthop; - this->public.interface.add_ip = (status_t(*)(kernel_net_t*,host_t*,host_t*)) add_ip; - this->public.interface.del_ip = (status_t(*)(kernel_net_t*,host_t*)) del_ip; - this->public.interface.add_route = (status_t(*)(kernel_net_t*,chunk_t,u_int8_t,host_t*,host_t*,char*)) add_route; - this->public.interface.del_route = (status_t(*)(kernel_net_t*,chunk_t,u_int8_t,host_t*,host_t*,char*)) del_route; - this->public.interface.destroy = (void(*)(kernel_net_t*)) destroy; - - /* private members */ - this->ifaces = linked_list_create(); - this->mutex = mutex_create(MUTEX_TYPE_RECURSIVE); - this->condvar = condvar_create(CONDVAR_TYPE_DEFAULT); - timerclear(&this->last_roam); - this->routing_table = lib->settings->get_int(lib->settings, - "charon.routing_table", ROUTING_TABLE); - this->routing_table_prio = lib->settings->get_int(lib->settings, - "charon.routing_table_prio", ROUTING_TABLE_PRIO); - this->process_route = lib->settings->get_bool(lib->settings, - "charon.process_route", TRUE); - this->install_virtual_ip = lib->settings->get_bool(lib->settings, - "charon.install_virtual_ip", TRUE); - - this->rt_exclude = linked_list_create(); - exclude = lib->settings->get_str(lib->settings, - "charon.ignore_routing_tables", NULL); - if (exclude) - { - char *token; - uintptr_t table; - - enumerator = enumerator_create_token(exclude, " ", " "); - while (enumerator->enumerate(enumerator, &token)) - { - errno = 0; - table = strtoul(token, NULL, 10); - - if (errno == 0) - { - this->rt_exclude->insert_last(this->rt_exclude, (void*)table); - } - } - enumerator->destroy(enumerator); - } - - this->socket = netlink_socket_create(NETLINK_ROUTE); - this->job = NULL; - - memset(&addr, 0, sizeof(addr)); - addr.nl_family = AF_NETLINK; - - /* create and bind RT socket for events (address/interface/route changes) */ - this->socket_events = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); - if (this->socket_events < 0) - { - DBG1(DBG_KNL, "unable to create RT event socket"); - destroy(this); - return NULL; - } - addr.nl_groups = RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR | - RTMGRP_IPV4_ROUTE | RTMGRP_IPV4_ROUTE | RTMGRP_LINK; - if (bind(this->socket_events, (struct sockaddr*)&addr, sizeof(addr))) - { - DBG1(DBG_KNL, "unable to bind RT event socket"); - destroy(this); - return NULL; - } - - this->job = callback_job_create((callback_job_cb_t)receive_events, - this, NULL, NULL); - hydra->processor->queue_job(hydra->processor, (job_t*)this->job); - - if (init_address_list(this) != SUCCESS) - { - DBG1(DBG_KNL, "unable to get interface list"); - destroy(this); - return NULL; - } - - if (this->routing_table) - { - if (manage_rule(this, RTM_NEWRULE, AF_INET, this->routing_table, - this->routing_table_prio) != SUCCESS) - { - DBG1(DBG_KNL, "unable to create IPv4 routing table rule"); - } - if (manage_rule(this, RTM_NEWRULE, AF_INET6, this->routing_table, - this->routing_table_prio) != SUCCESS) - { - DBG1(DBG_KNL, "unable to create IPv6 routing table rule"); - } - } - - return &this->public; -} diff --git a/src/libcharon/plugins/kernel_netlink/kernel_netlink_net.h b/src/libcharon/plugins/kernel_netlink/kernel_netlink_net.h deleted file mode 100644 index ff9831d3c..000000000 --- a/src/libcharon/plugins/kernel_netlink/kernel_netlink_net.h +++ /dev/null @@ -1,46 +0,0 @@ -/* - * Copyright (C) 2008 Tobias Brunner - * 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. - */ - -/** - * @defgroup kernel_netlink_net_i kernel_netlink_net - * @{ @ingroup kernel_netlink - */ - -#ifndef KERNEL_NETLINK_NET_H_ -#define KERNEL_NETLINK_NET_H_ - -#include <kernel/kernel_net.h> - -typedef struct kernel_netlink_net_t kernel_netlink_net_t; - -/** - * Implementation of the kernel network interface using Netlink. - */ -struct kernel_netlink_net_t { - - /** - * Implements kernel_net_t interface - */ - kernel_net_t interface; -}; - -/** - * Create a netlink kernel network interface instance. - * - * @return kernel_netlink_net_t instance - */ -kernel_netlink_net_t *kernel_netlink_net_create(); - -#endif /** KERNEL_NETLINK_NET_H_ @}*/ diff --git a/src/libcharon/plugins/kernel_netlink/kernel_netlink_plugin.c b/src/libcharon/plugins/kernel_netlink/kernel_netlink_plugin.c deleted file mode 100644 index 212675d1a..000000000 --- a/src/libcharon/plugins/kernel_netlink/kernel_netlink_plugin.c +++ /dev/null @@ -1,63 +0,0 @@ -/* - * Copyright (C) 2008 Tobias Brunner - * 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 "kernel_netlink_plugin.h" - -#include "kernel_netlink_ipsec.h" -#include "kernel_netlink_net.h" - -#include <hydra.h> - -typedef struct private_kernel_netlink_plugin_t private_kernel_netlink_plugin_t; - -/** - * private data of kernel netlink plugin - */ -struct private_kernel_netlink_plugin_t { - /** - * implements plugin interface - */ - kernel_netlink_plugin_t public; -}; - -/** - * Implementation of plugin_t.destroy - */ -static void destroy(private_kernel_netlink_plugin_t *this) -{ - hydra->kernel_interface->remove_ipsec_interface(hydra->kernel_interface, - (kernel_ipsec_constructor_t)kernel_netlink_ipsec_create); - hydra->kernel_interface->remove_net_interface(hydra->kernel_interface, - (kernel_net_constructor_t)kernel_netlink_net_create); - free(this); -} - -/* - * see header file - */ -plugin_t *kernel_netlink_plugin_create() -{ - private_kernel_netlink_plugin_t *this = malloc_thing(private_kernel_netlink_plugin_t); - - this->public.plugin.destroy = (void(*)(plugin_t*))destroy; - - hydra->kernel_interface->add_ipsec_interface(hydra->kernel_interface, - (kernel_ipsec_constructor_t)kernel_netlink_ipsec_create); - hydra->kernel_interface->add_net_interface(hydra->kernel_interface, - (kernel_net_constructor_t)kernel_netlink_net_create); - - return &this->public.plugin; -} diff --git a/src/libcharon/plugins/kernel_netlink/kernel_netlink_plugin.h b/src/libcharon/plugins/kernel_netlink/kernel_netlink_plugin.h deleted file mode 100644 index 74c9ae24f..000000000 --- a/src/libcharon/plugins/kernel_netlink/kernel_netlink_plugin.h +++ /dev/null @@ -1,42 +0,0 @@ -/* - * Copyright (C) 2008 Tobias Brunner - * 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. - */ - -/** - * @defgroup kernel_netlink kernel_netlink - * @ingroup cplugins - * - * @defgroup kernel_netlink_plugin kernel_netlink_plugin - * @{ @ingroup kernel_netlink - */ - -#ifndef KERNEL_NETLINK_PLUGIN_H_ -#define KERNEL_NETLINK_PLUGIN_H_ - -#include <plugins/plugin.h> - -typedef struct kernel_netlink_plugin_t kernel_netlink_plugin_t; - -/** - * netlink kernel interface plugin - */ -struct kernel_netlink_plugin_t { - - /** - * implements plugin interface - */ - plugin_t plugin; -}; - -#endif /** KERNEL_NETLINK_PLUGIN_H_ @}*/ diff --git a/src/libcharon/plugins/kernel_netlink/kernel_netlink_shared.c b/src/libcharon/plugins/kernel_netlink/kernel_netlink_shared.c deleted file mode 100644 index 5ed568150..000000000 --- a/src/libcharon/plugins/kernel_netlink/kernel_netlink_shared.c +++ /dev/null @@ -1,306 +0,0 @@ -/* - * Copyright (C) 2008 Tobias Brunner - * 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/socket.h> -#include <linux/netlink.h> -#include <linux/rtnetlink.h> -#include <errno.h> -#include <unistd.h> - -#include "kernel_netlink_shared.h" - -#include <daemon.h> -#include <threading/mutex.h> - -typedef struct private_netlink_socket_t private_netlink_socket_t; - -/** - * Private variables and functions of netlink_socket_t class. - */ -struct private_netlink_socket_t { - /** - * public part of the netlink_socket_t object. - */ - netlink_socket_t public; - - /** - * mutex to lock access to netlink socket - */ - mutex_t *mutex; - - /** - * current sequence number for netlink request - */ - int seq; - - /** - * netlink socket protocol - */ - int protocol; - - /** - * netlink socket - */ - int socket; -}; - -/** - * Imported from kernel_netlink_ipsec.c - */ -extern enum_name_t *xfrm_msg_names; - -/** - * Implementation of netlink_socket_t.send - */ -static status_t netlink_send(private_netlink_socket_t *this, struct nlmsghdr *in, - struct nlmsghdr **out, size_t *out_len) -{ - int len, addr_len; - struct sockaddr_nl addr; - chunk_t result = chunk_empty, tmp; - struct nlmsghdr *msg, peek; - - this->mutex->lock(this->mutex); - - in->nlmsg_seq = ++this->seq; - in->nlmsg_pid = getpid(); - - memset(&addr, 0, sizeof(addr)); - addr.nl_family = AF_NETLINK; - addr.nl_pid = 0; - addr.nl_groups = 0; - - if (this->protocol == NETLINK_XFRM) - { - chunk_t in_chunk = { (u_char*)in, in->nlmsg_len }; - - DBG3(DBG_KNL, "sending %N: %B", xfrm_msg_names, in->nlmsg_type, &in_chunk); - } - - while (TRUE) - { - len = sendto(this->socket, in, in->nlmsg_len, 0, - (struct sockaddr*)&addr, sizeof(addr)); - - if (len != in->nlmsg_len) - { - if (errno == EINTR) - { - /* interrupted, try again */ - continue; - } - this->mutex->unlock(this->mutex); - DBG1(DBG_KNL, "error sending to netlink socket: %s", strerror(errno)); - return FAILED; - } - break; - } - - while (TRUE) - { - char buf[4096]; - tmp.len = sizeof(buf); - tmp.ptr = buf; - msg = (struct nlmsghdr*)tmp.ptr; - - memset(&addr, 0, sizeof(addr)); - addr.nl_family = AF_NETLINK; - addr.nl_pid = getpid(); - addr.nl_groups = 0; - addr_len = sizeof(addr); - - len = recvfrom(this->socket, tmp.ptr, tmp.len, 0, - (struct sockaddr*)&addr, &addr_len); - - if (len < 0) - { - if (errno == EINTR) - { - DBG1(DBG_KNL, "got interrupted"); - /* interrupted, try again */ - continue; - } - DBG1(DBG_KNL, "error reading from netlink socket: %s", strerror(errno)); - this->mutex->unlock(this->mutex); - free(result.ptr); - return FAILED; - } - if (!NLMSG_OK(msg, len)) - { - DBG1(DBG_KNL, "received corrupted netlink message"); - this->mutex->unlock(this->mutex); - free(result.ptr); - return FAILED; - } - if (msg->nlmsg_seq != this->seq) - { - DBG1(DBG_KNL, "received invalid netlink sequence number"); - if (msg->nlmsg_seq < this->seq) - { - continue; - } - this->mutex->unlock(this->mutex); - free(result.ptr); - return FAILED; - } - - tmp.len = len; - result.ptr = realloc(result.ptr, result.len + tmp.len); - memcpy(result.ptr + result.len, tmp.ptr, tmp.len); - result.len += tmp.len; - - /* NLM_F_MULTI flag does not seem to be set correctly, we use sequence - * numbers to detect multi header messages */ - len = recvfrom(this->socket, &peek, sizeof(peek), MSG_PEEK | MSG_DONTWAIT, - (struct sockaddr*)&addr, &addr_len); - - if (len == sizeof(peek) && peek.nlmsg_seq == this->seq) - { - /* seems to be multipart */ - continue; - } - break; - } - - *out_len = result.len; - *out = (struct nlmsghdr*)result.ptr; - - this->mutex->unlock(this->mutex); - - return SUCCESS; -} - -/** - * Implementation of netlink_socket_t.send_ack. - */ -static status_t netlink_send_ack(private_netlink_socket_t *this, struct nlmsghdr *in) -{ - struct nlmsghdr *out, *hdr; - size_t len; - - if (netlink_send(this, in, &out, &len) != SUCCESS) - { - return FAILED; - } - hdr = out; - while (NLMSG_OK(hdr, len)) - { - switch (hdr->nlmsg_type) - { - case NLMSG_ERROR: - { - struct nlmsgerr* err = (struct nlmsgerr*)NLMSG_DATA(hdr); - - if (err->error) - { - if (-err->error == EEXIST) - { /* do not report existing routes */ - free(out); - return ALREADY_DONE; - } - DBG1(DBG_KNL, "received netlink error: %s (%d)", - strerror(-err->error), -err->error); - free(out); - return FAILED; - } - free(out); - return SUCCESS; - } - default: - hdr = NLMSG_NEXT(hdr, len); - continue; - case NLMSG_DONE: - break; - } - break; - } - DBG1(DBG_KNL, "netlink request not acknowledged"); - free(out); - return FAILED; -} - -/** - * Implementation of netlink_socket_t.destroy. - */ -static void destroy(private_netlink_socket_t *this) -{ - if (this->socket > 0) - { - close(this->socket); - } - this->mutex->destroy(this->mutex); - free(this); -} - -/** - * Described in header. - */ -netlink_socket_t *netlink_socket_create(int protocol) -{ - private_netlink_socket_t *this = malloc_thing(private_netlink_socket_t); - struct sockaddr_nl addr; - - /* public functions */ - this->public.send = (status_t(*)(netlink_socket_t*,struct nlmsghdr*, struct nlmsghdr**, size_t*))netlink_send; - this->public.send_ack = (status_t(*)(netlink_socket_t*,struct nlmsghdr*))netlink_send_ack; - this->public.destroy = (void(*)(netlink_socket_t*))destroy; - - /* private members */ - this->seq = 200; - this->mutex = mutex_create(MUTEX_TYPE_DEFAULT); - - memset(&addr, 0, sizeof(addr)); - addr.nl_family = AF_NETLINK; - - this->protocol = protocol; - this->socket = socket(AF_NETLINK, SOCK_RAW, protocol); - if (this->socket < 0) - { - DBG1(DBG_KNL, "unable to create netlink socket"); - destroy(this); - return NULL; - } - - addr.nl_groups = 0; - if (bind(this->socket, (struct sockaddr*)&addr, sizeof(addr))) - { - DBG1(DBG_KNL, "unable to bind netlink socket"); - destroy(this); - return NULL; - } - - return &this->public; -} - -/** - * Described in header. - */ -void netlink_add_attribute(struct nlmsghdr *hdr, int rta_type, chunk_t data, - size_t buflen) -{ - struct rtattr *rta; - - if (NLMSG_ALIGN(hdr->nlmsg_len) + RTA_ALIGN(data.len) > buflen) - { - DBG1(DBG_KNL, "unable to add attribute, buffer too small"); - return; - } - - rta = (struct rtattr*)(((char*)hdr) + NLMSG_ALIGN(hdr->nlmsg_len)); - rta->rta_type = rta_type; - rta->rta_len = RTA_LENGTH(data.len); - memcpy(RTA_DATA(rta), data.ptr, data.len); - hdr->nlmsg_len = NLMSG_ALIGN(hdr->nlmsg_len) + rta->rta_len; -} diff --git a/src/libcharon/plugins/kernel_netlink/kernel_netlink_shared.h b/src/libcharon/plugins/kernel_netlink/kernel_netlink_shared.h deleted file mode 100644 index dfd27a21a..000000000 --- a/src/libcharon/plugins/kernel_netlink/kernel_netlink_shared.h +++ /dev/null @@ -1,77 +0,0 @@ -/* - * Copyright (C) 2008 Tobias Brunner - * 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. - */ - -#ifndef KERNEL_NETLINK_SHARED_H_ -#define KERNEL_NETLINK_SHARED_H_ - -#include <library.h> - -#include <linux/rtnetlink.h> - -/** - * General purpose netlink buffer. - * - * 1024 byte is currently sufficient for all operations. Some platform - * require an enforced aligment to four bytes (e.g. ARM). - */ -typedef u_char netlink_buf_t[1024] __attribute__((aligned(RTA_ALIGNTO))); - -typedef struct netlink_socket_t netlink_socket_t; - -/** - * Wrapper around a netlink socket. - */ -struct netlink_socket_t { - - /** - * Send a netlink message and wait for a reply. - * - * @param in netlink message to send - * @param out received netlink message - * @param out_len length of the received message - */ - status_t (*send)(netlink_socket_t *this, struct nlmsghdr *in, struct nlmsghdr **out, size_t *out_len); - - /** - * Send a netlink message and wait for its acknowledge. - * - * @param in netlink message to send - */ - status_t (*send_ack)(netlink_socket_t *this, struct nlmsghdr *in); - - /** - * Destroy the socket. - */ - void (*destroy)(netlink_socket_t *this); -}; - -/** - * Create a netlink_socket_t object. - * - * @param protocol protocol type (e.g. NETLINK_XFRM or NETLINK_ROUTE) - */ -netlink_socket_t *netlink_socket_create(int protocol); - -/** - * Creates an rtattr and adds it to the given netlink message. - * - * @param hdr netlink message - * @param rta_type type of the rtattr - * @param data data to add to the rtattr - * @param buflen length of the netlink message buffer - */ -void netlink_add_attribute(struct nlmsghdr *hdr, int rta_type, chunk_t data, size_t buflen); - -#endif /* KERNEL_NETLINK_SHARED_H_ */ |