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Diffstat (limited to 'src/charon/threads/kernel_interface.c')
| -rw-r--r-- | src/charon/threads/kernel_interface.c | 1964 |
1 files changed, 0 insertions, 1964 deletions
diff --git a/src/charon/threads/kernel_interface.c b/src/charon/threads/kernel_interface.c deleted file mode 100644 index 4a70d2ecf..000000000 --- a/src/charon/threads/kernel_interface.c +++ /dev/null @@ -1,1964 +0,0 @@ -/** - * @file kernel_interface.c - * - * @brief Implementation of kernel_interface_t. - * - */ - -/* - * Copyright (C) 2005-2007 Martin Willi - * Copyright (C) 2006-2007 Tobias Brunner - * Copyright (C) 2006-2007 Fabian Hartmann, Noah Heusser - * Copyright (C) 2006 Daniel Roethlisberger - * Copyright (C) 2005 Jan Hutter - * Hochschule fuer Technik Rapperswil - * Copyright (C) 2003 Herbert Xu. - * - * Based on xfrm code from pluto. - * - * 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 <linux/netlink.h> -#include <linux/rtnetlink.h> -#include <linux/xfrm.h> -#include <linux/udp.h> -#include <pthread.h> -#include <unistd.h> -#include <fcntl.h> -#include <errno.h> -#include <string.h> -#include <net/if.h> -#include <sys/ioctl.h> - -#include "kernel_interface.h" - -#include <daemon.h> -#include <utils/linked_list.h> -#include <queues/jobs/delete_child_sa_job.h> -#include <queues/jobs/rekey_child_sa_job.h> -#include <queues/jobs/acquire_job.h> - -/** kernel level protocol identifiers */ -#define KERNEL_ESP 50 -#define KERNEL_AH 51 - -/** default priority of installed policies */ -#define PRIO_LOW 3000 -#define PRIO_HIGH 2000 - -#define BUFFER_SIZE 1024 - -/** - * 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 from the algorithms defined in IKEv2 to - * kernel level algorithm names and their key length - */ -struct kernel_algorithm_t { - /** - * Identifier specified in IKEv2 - */ - int ikev2_id; - - /** - * Name of the algorithm, as used as kernel identifier - */ - char *name; - - /** - * Key length in bits, if fixed size - */ - u_int key_size; -}; -#define END_OF_LIST -1 - -/** - * Algorithms for encryption - */ -kernel_algorithm_t encryption_algs[] = { -/* {ENCR_DES_IV64, "***", 0}, */ - {ENCR_DES, "des", 64}, - {ENCR_3DES, "des3_ede", 192}, -/* {ENCR_RC5, "***", 0}, */ -/* {ENCR_IDEA, "***", 0}, */ - {ENCR_CAST, "cast128", 0}, - {ENCR_BLOWFISH, "blowfish", 0}, -/* {ENCR_3IDEA, "***", 0}, */ -/* {ENCR_DES_IV32, "***", 0}, */ - {ENCR_NULL, "cipher_null", 0}, - {ENCR_AES_CBC, "aes", 0}, -/* {ENCR_AES_CTR, "***", 0}, */ - {END_OF_LIST, NULL, 0}, -}; - -/** - * Algorithms for integrity protection - */ -kernel_algorithm_t integrity_algs[] = { - {AUTH_HMAC_MD5_96, "md5", 128}, - {AUTH_HMAC_SHA1_96, "sha1", 160}, - {AUTH_HMAC_SHA2_256_128, "sha256", 256}, - {AUTH_HMAC_SHA2_384_192, "sha384", 384}, - {AUTH_HMAC_SHA2_512_256, "sha512", 512}, -/* {AUTH_DES_MAC, "***", 0}, */ -/* {AUTH_KPDK_MD5, "***", 0}, */ -/* {AUTH_AES_XCBC_96, "***", 0}, */ - {END_OF_LIST, NULL, 0}, -}; - -/** - * Look up a kernel algorithm name and its key size - */ -char* lookup_algorithm(kernel_algorithm_t *kernel_algo, - algorithm_t *ikev2_algo, u_int *key_size) -{ - while (kernel_algo->ikev2_id != END_OF_LIST) - { - if (ikev2_algo->algorithm == kernel_algo->ikev2_id) - { - /* match, evaluate key length */ - if (ikev2_algo->key_size) - { /* variable length */ - *key_size = ikev2_algo->key_size; - } - else - { /* fixed length */ - *key_size = kernel_algo->key_size; - } - return kernel_algo->name; - } - kernel_algo++; - } - return NULL; -} - -typedef struct route_entry_t route_entry_t; - -/** - * installed routing entry - */ -struct route_entry_t { - - /** Index of the interface the route is bound to */ - int if_index; - - /** Source ip of the route */ - host_t *src_ip; - - /** 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) -{ - this->src_ip->destroy(this->src_ip); - 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; - - /** reqid of the policy */ - u_int32_t reqid; - - /** parameters of installed policy */ - struct xfrm_selector sel; - - /** associated route installed for this policy */ - route_entry_t *route; - - /** by how many CHILD_SA's this policy is used */ - u_int refcount; -}; - -typedef struct vip_entry_t vip_entry_t; - -/** - * Installed virtual ip - */ -struct vip_entry_t { - /** Index of the interface the ip is bound to */ - u_int8_t if_index; - - /** The ip address */ - host_t *ip; - - /** Number of times this IP is used */ - u_int refcount; -}; - -/** - * destroy a vip_entry_t object - */ -static void vip_entry_destroy(vip_entry_t *this) -{ - this->ip->destroy(this->ip); - free(this); -} - -typedef struct address_entry_t address_entry_t; - -/** - * an address found on the system, containg address and interface info - */ -struct address_entry_t { - - /** address of this entry */ - host_t *host; - - /** interface index */ - int ifindex; - - /** name of the index */ - char ifname[IFNAMSIZ]; -}; - -/** - * destroy an address entry - */ -static void address_entry_destroy(address_entry_t *this) -{ - this->host->destroy(this->host); - free(this); -} - -typedef struct private_kernel_interface_t private_kernel_interface_t; - -/** - * Private variables and functions of kernel_interface class. - */ -struct private_kernel_interface_t { - /** - * Public part of the kernel_interface_t object. - */ - kernel_interface_t public; - - /** - * List of installed policies (kernel_entry_t) - */ - linked_list_t *policies; - - /** - * Mutex locks access to policies - */ - pthread_mutex_t policies_mutex; - - /** - * List of installed virtual IPs. (vip_entry_t) - */ - linked_list_t *vips; - - /** - * Mutex to lock access to vips. - */ - pthread_mutex_t vips_mutex; - - /** - * netlink xfrm socket to receive acquire and expire events - */ - int socket_xfrm_events; - - /** - * Netlink xfrm socket (IPsec) - */ - int socket_xfrm; - - /** - * Netlink rt socket (routing) - */ - int socket_rt; - - /** - * Thread receiving events from kernel - */ - pthread_t event_thread; -}; - -/** - * 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 traffic selector address range to subnet and its mask. - */ -static void ts2subnet(traffic_selector_t* ts, - xfrm_address_t *net, u_int8_t *mask) -{ - /* there is no way to do this cleanly, as the address range may - * be anything else but a subnet. We use from_addr as subnet - * and try to calculate a usable subnet mask. - */ - int byte, bit; - bool found = FALSE; - chunk_t from, to; - size_t size = (ts->get_type(ts) == TS_IPV4_ADDR_RANGE) ? 4 : 16; - - from = ts->get_from_address(ts); - to = ts->get_to_address(ts); - - *mask = (size * 8); - /* go trough all bits of the addresses, beginning in the front. - * as long as they are equal, the subnet gets larger - */ - for (byte = 0; byte < size; byte++) - { - for (bit = 7; bit >= 0; bit--) - { - if ((1<<bit & from.ptr[byte]) != (1<<bit & to.ptr[byte])) - { - *mask = ((7 - bit) + (byte * 8)); - found = TRUE; - break; - } - } - if (found) - { - break; - } - } - memcpy(net, from.ptr, from.len); - chunk_free(&from); - chunk_free(&to); -} - -/** - * 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; -} - -/** - * Creates an rtattr and adds it to the netlink message - */ -static void 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; -} - -/** - * Receives events from kernel - */ -static void receive_events(private_kernel_interface_t *this) -{ - while(TRUE) - { - unsigned char response[512]; - struct nlmsghdr *hdr; - struct sockaddr_nl addr; - socklen_t addr_len = sizeof(addr); - int len; - - hdr = (struct nlmsghdr*)response; - len = recvfrom(this->socket_xfrm_events, response, sizeof(response), - 0, (struct sockaddr*)&addr, &addr_len); - if (len < 0) - { - if (errno == EINTR) - { - /* interrupted, try again */ - continue; - } - charon->kill(charon, "unable to receive netlink events"); - } - - if (!NLMSG_OK(hdr, len)) - { - /* bad netlink message */ - continue; - } - - if (addr.nl_pid != 0) - { - /* not from kernel. not interested, try another one */ - continue; - } - - /* we handle ACQUIRE and EXPIRE messages directly */ - if (hdr->nlmsg_type == XFRM_MSG_ACQUIRE) - { - u_int32_t reqid = 0; - job_t *job; - struct rtattr *rtattr = XFRM_RTA(hdr, struct xfrm_user_acquire); - size_t rtsize = XFRM_PAYLOAD(hdr, struct xfrm_user_tmpl); - if (RTA_OK(rtattr, rtsize)) - { - if (rtattr->rta_type == XFRMA_TMPL) - { - struct xfrm_user_tmpl* tmpl = (struct xfrm_user_tmpl*)RTA_DATA(rtattr); - reqid = tmpl->reqid; - } - } - if (reqid == 0) - { - DBG1(DBG_KNL, "received a XFRM_MSG_ACQUIRE, but no reqid found"); - } - else - { - DBG2(DBG_KNL, "received a XFRM_MSG_ACQUIRE"); - DBG1(DBG_KNL, "creating acquire job for CHILD_SA with reqid %d", - reqid); - job = (job_t*)acquire_job_create(reqid); - charon->job_queue->add(charon->job_queue, job); - } - } - else if (hdr->nlmsg_type == XFRM_MSG_EXPIRE) - { - job_t *job; - protocol_id_t protocol; - u_int32_t spi, reqid; - struct xfrm_user_expire *expire; - - expire = (struct xfrm_user_expire*)NLMSG_DATA(hdr); - protocol = expire->state.id.proto == KERNEL_ESP ? - PROTO_ESP : PROTO_AH; - spi = expire->state.id.spi; - reqid = expire->state.reqid; - - DBG2(DBG_KNL, "received a XFRM_MSG_EXPIRE"); - DBG1(DBG_KNL, "creating %s job for %N CHILD_SA 0x%x (reqid %d)", - expire->hard ? "delete" : "rekey", protocol_id_names, - protocol, ntohl(spi), reqid); - if (expire->hard) - { - job = (job_t*)delete_child_sa_job_create(reqid, protocol, spi); - } - else - { - job = (job_t*)rekey_child_sa_job_create(reqid, protocol, spi); - } - charon->job_queue->add(charon->job_queue, job); - } - } -} - -/** - * send a netlink message and wait for a reply - */ -static status_t netlink_send(int socket, 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; - - static int seq = 200; - static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; - - - pthread_mutex_lock(&mutex); - - in->nlmsg_seq = ++seq; - in->nlmsg_pid = getpid(); - - memset(&addr, 0, sizeof(addr)); - addr.nl_family = AF_NETLINK; - addr.nl_pid = 0; - addr.nl_groups = 0; - - while (TRUE) - { - len = sendto(socket, in, in->nlmsg_len, 0, - (struct sockaddr*)&addr, sizeof(addr)); - - if (len != in->nlmsg_len) - { - if (errno == EINTR) - { - /* interrupted, try again */ - continue; - } - pthread_mutex_unlock(&mutex); - DBG1(DBG_KNL, "error sending to netlink socket: %m"); - return FAILED; - } - break; - } - - while (TRUE) - { - char buf[1024]; - 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(socket, tmp.ptr, tmp.len, 0, - (struct sockaddr*)&addr, &addr_len); - - if (len < 0) - { - if (errno == EINTR) - { - DBG1(DBG_IKE, "got interrupted"); - /* interrupted, try again */ - continue; - } - DBG1(DBG_IKE, "error reading from netlink socket: %m"); - pthread_mutex_unlock(&mutex); - return FAILED; - } - if (!NLMSG_OK(msg, len)) - { - DBG1(DBG_IKE, "received corrupted netlink message"); - pthread_mutex_unlock(&mutex); - return FAILED; - } - if (msg->nlmsg_seq != seq) - { - DBG1(DBG_IKE, "received invalid netlink sequence number"); - if (msg->nlmsg_seq < seq) - { - continue; - } - pthread_mutex_unlock(&mutex); - return FAILED; - } - - tmp.len = len; - result = chunk_cata("cc", result, tmp); - - /* NLM_F_MULTI flag does not seem to be set correctly, we use sequence - * numbers to detect multi header messages */ - len = recvfrom(socket, &peek, sizeof(peek), MSG_PEEK | MSG_DONTWAIT, - (struct sockaddr*)&addr, &addr_len); - - if (len == sizeof(peek) && peek.nlmsg_seq == seq) - { - /* seems to be multipart */ - continue; - } - break; - } - - *out_len = result.len; - *out = (struct nlmsghdr*)clalloc(result.ptr, result.len); - - pthread_mutex_unlock(&mutex); - - return SUCCESS; -} - -/** - * send a netlink message and wait for its acknowlegde - */ -static status_t netlink_send_ack(int socket, struct nlmsghdr *in) -{ - struct nlmsghdr *out, *hdr; - size_t len; - - if (netlink_send(socket, 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) - { - 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 acknowlegded"); - free(out); - return FAILED; -} - -/** - * Create a list of local addresses. - */ -static linked_list_t *create_address_list(private_kernel_interface_t *this) -{ - char request[BUFFER_SIZE]; - struct nlmsghdr *out, *hdr; - struct rtgenmsg *msg; - size_t len; - linked_list_t *list; - - DBG2(DBG_IKE, "getting local address list"); - - list = linked_list_create(); - - memset(&request, 0, sizeof(request)); - - hdr = (struct nlmsghdr*)&request; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg)); - hdr->nlmsg_type = RTM_GETADDR; - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_MATCH | NLM_F_ROOT; - msg = (struct rtgenmsg*)NLMSG_DATA(hdr); - msg->rtgen_family = AF_UNSPEC; - - if (netlink_send(this->socket_rt, hdr, &out, &len) == SUCCESS) - { - hdr = out; - while (NLMSG_OK(hdr, len)) - { - switch (hdr->nlmsg_type) - { - case RTM_NEWADDR: - { - struct ifaddrmsg* msg = (struct ifaddrmsg*)(NLMSG_DATA(hdr)); - struct rtattr *rta = IFA_RTA(msg); - size_t rtasize = IFA_PAYLOAD (hdr); - host_t *host = NULL; - char *name = NULL; - chunk_t local = chunk_empty, address = chunk_empty; - - 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; - case IFA_LABEL: - name = RTA_DATA(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, 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) - { - address_entry_t *entry; - - entry = malloc_thing(address_entry_t); - entry->host = host; - entry->ifindex = msg->ifa_index; - if (name) - { - memcpy(entry->ifname, name, IFNAMSIZ); - } - else - { - strcpy(entry->ifname, "(unknown)"); - } - list->insert_last(list, entry); - } - hdr = NLMSG_NEXT(hdr, len); - continue; - } - default: - hdr = NLMSG_NEXT(hdr, len); - continue; - case NLMSG_DONE: - break; - } - break; - } - free(out); - } - else - { - DBG1(DBG_IKE, "unable to get local address list"); - } - - return list; -} - -/** - * Implements kernel_interface_t.create_address_list. - */ -static linked_list_t *create_address_list_public(private_kernel_interface_t *this) -{ - linked_list_t *result, *list; - address_entry_t *entry; - - result = linked_list_create(); - list = create_address_list(this); - while (list->remove_last(list, (void**)&entry) == SUCCESS) - { - result->insert_last(result, entry->host); - free(entry); - } - list->destroy(list); - - return result; -} - -/** - * implementation of kernel_interface_t.get_interface_name - */ -static char *get_interface_name(private_kernel_interface_t *this, host_t* ip) -{ - linked_list_t *list; - address_entry_t *entry; - char *name = NULL; - - DBG2(DBG_IKE, "getting interface name for %H", ip); - - list = create_address_list(this); - while (!name && list->remove_last(list, (void**)&entry) == SUCCESS) - { - if (ip->ip_equals(ip, entry->host)) - { - name = strdup(entry->ifname); - } - address_entry_destroy(entry); - } - list->destroy_function(list, (void*)address_entry_destroy); - - if (name) - { - DBG2(DBG_IKE, "%H is on interface %s", ip, name); - } - else - { - DBG2(DBG_IKE, "%H is not a local address", ip); - } - return name; -} - -/** - * Tries to find an ip address of a local interface that is included in the - * supplied traffic selector. - */ -static status_t get_address_by_ts(private_kernel_interface_t *this, - traffic_selector_t *ts, host_t **ip) -{ - address_entry_t *entry; - host_t *host; - int family; - linked_list_t *list; - bool found = FALSE; - - DBG2(DBG_IKE, "getting a local address in traffic selector %R", ts); - - /* if we have a family which includes localhost, we do not - * search for an IP, we use the default */ - family = ts->get_type(ts) == TS_IPV4_ADDR_RANGE ? AF_INET : AF_INET6; - - if (family == AF_INET) - { - host = host_create_from_string("127.0.0.1", 0); - } - else - { - host = host_create_from_string("::1", 0); - } - - if (ts->includes(ts, host)) - { - *ip = host_create_any(family); - host->destroy(host); - DBG2(DBG_IKE, "using host %H", *ip); - return SUCCESS; - } - host->destroy(host); - - list = create_address_list(this); - while (!found && list->remove_last(list, (void**)&entry) == SUCCESS) - { - if (ts->includes(ts, entry->host)) - { - found = TRUE; - *ip = entry->host->clone(entry->host); - } - address_entry_destroy(entry); - } - list->destroy_function(list, (void*)address_entry_destroy); - - if (!found) - { - DBG1(DBG_IKE, "no local address found in traffic selector %R", ts); - return FAILED; - } - DBG2(DBG_IKE, "using host %H", *ip); - return SUCCESS; -} - -/** - * get the interface of a local address - */ -static int get_interface_index(private_kernel_interface_t *this, host_t* ip) -{ - linked_list_t *list; - address_entry_t *entry; - int ifindex = 0; - - DBG2(DBG_IKE, "getting iface for %H", ip); - - list = create_address_list(this); - while (!ifindex && list->remove_last(list, (void**)&entry) == SUCCESS) - { - if (ip->ip_equals(ip, entry->host)) - { - ifindex = entry->ifindex; - } - address_entry_destroy(entry); - } - list->destroy_function(list, (void*)address_entry_destroy); - - if (ifindex == 0) - { - DBG1(DBG_IKE, "unable to get interface for %H", ip); - } - return ifindex; -} - -/** - * 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_interface_t *this, int nlmsg_type, - int flags, int if_index, host_t *ip) -{ - unsigned char request[BUFFER_SIZE]; - 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; - - add_attribute(hdr, IFA_LOCAL, chunk, sizeof(request)); - - return netlink_send_ack(this->socket_rt, hdr); -} - -/** - * Manages source routes in the routing table. - * By setting the appropriate nlmsg_type, the route added or r. - */ -static status_t manage_srcroute(private_kernel_interface_t *this, int nlmsg_type, - int flags, route_entry_t *route) -{ - unsigned char request[BUFFER_SIZE]; - struct nlmsghdr *hdr; - struct rtmsg *msg; - 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 - * TODO: use metrics instead */ - if (route->prefixlen == 0) - { - route_entry_t half; - status_t status; - - half.dst_net = chunk_alloca(route->dst_net.len); - memset(half.dst_net.ptr, 0, half.dst_net.len); - half.src_ip = route->src_ip; - half.if_index = route->if_index; - half.prefixlen = 1; - - status = manage_srcroute(this, nlmsg_type, flags, &half); - half.dst_net.ptr[0] |= 0x80; - status = manage_srcroute(this, nlmsg_type, flags, &half); - 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 = route->src_ip->get_family(route->src_ip); - msg->rtm_dst_len = route->prefixlen; - msg->rtm_table = RT_TABLE_MAIN; - msg->rtm_protocol = RTPROT_STATIC; - msg->rtm_type = RTN_UNICAST; - msg->rtm_scope = RT_SCOPE_UNIVERSE; - - add_attribute(hdr, RTA_DST, route->dst_net, sizeof(request)); - chunk = route->src_ip->get_address(route->src_ip); - add_attribute(hdr, RTA_PREFSRC, chunk, sizeof(request)); - chunk.ptr = (char*)&route->if_index; - chunk.len = sizeof(route->if_index); - add_attribute(hdr, RTA_OIF, chunk, sizeof(request)); - - return netlink_send_ack(this->socket_rt, hdr); -} - - -/** - * Implementation of kernel_interface_t.add_ip. - */ -static status_t add_ip(private_kernel_interface_t *this, - host_t *virtual_ip, host_t *iface_ip) -{ - int targetif; - vip_entry_t *listed; - iterator_t *iterator; - - DBG2(DBG_KNL, "adding virtual IP %H", virtual_ip); - - targetif = get_interface_index(this, iface_ip); - if (targetif == 0) - { - DBG1(DBG_KNL, "unable to add virtual IP %H, no iface found for %H", - virtual_ip, iface_ip); - return FAILED; - } - - /* beware of deadlocks (e.g. send/receive packets while holding the lock) */ - iterator = this->vips->create_iterator_locked(this->vips, &(this->vips_mutex)); - while (iterator->iterate(iterator, (void**)&listed)) - { - if (listed->if_index == targetif && - virtual_ip->ip_equals(virtual_ip, listed->ip)) - { - listed->refcount++; - iterator->destroy(iterator); - DBG2(DBG_KNL, "virtual IP %H already added to iface %d reusing it", - virtual_ip, targetif); - return SUCCESS; - } - } - iterator->destroy(iterator); - - if (manage_ipaddr(this, RTM_NEWADDR, NLM_F_CREATE | NLM_F_EXCL, - targetif, virtual_ip) == SUCCESS) - { - listed = malloc_thing(vip_entry_t); - listed->ip = virtual_ip->clone(virtual_ip); - listed->if_index = targetif; - listed->refcount = 1; - this->vips->insert_last(this->vips, listed); - DBG2(DBG_KNL, "virtual IP %H added to iface %d", - virtual_ip, targetif); - return SUCCESS; - } - - DBG2(DBG_KNL, "unable to add virtual IP %H to iface %d", - virtual_ip, targetif); - return FAILED; -} - -/** - * Implementation of kernel_interface_t.del_ip. - */ -static status_t del_ip(private_kernel_interface_t *this, - host_t *virtual_ip, host_t *iface_ip) -{ - int targetif; - vip_entry_t *listed; - iterator_t *iterator; - - DBG2(DBG_KNL, "deleting virtual IP %H", virtual_ip); - - targetif = get_interface_index(this, iface_ip); - if (targetif == 0) - { - DBG1(DBG_KNL, "unable to delete virtual IP %H, no iface found for %H", - virtual_ip, iface_ip); - return FAILED; - } - - /* beware of deadlocks (e.g. send/receive packets while holding the lock) */ - iterator = this->vips->create_iterator_locked(this->vips, &(this->vips_mutex)); - while (iterator->iterate(iterator, (void**)&listed)) - { - if (listed->if_index == targetif && - virtual_ip->ip_equals(virtual_ip, listed->ip)) - { - listed->refcount--; - if (listed->refcount == 0) - { - iterator->remove(iterator); - vip_entry_destroy(listed); - iterator->destroy(iterator); - return manage_ipaddr(this, RTM_DELADDR, 0, targetif, virtual_ip); - } - iterator->destroy(iterator); - DBG2(DBG_KNL, "virtual IP %H used by other SAs, not deleting", - virtual_ip); - return SUCCESS; - } - } - iterator->destroy(iterator); - - DBG2(DBG_KNL, "virtual IP %H not cached, unable to delete", virtual_ip); - return FAILED; -} - -/** - * Implementation of kernel_interface_t.get_spi. - */ -static status_t get_spi(private_kernel_interface_t *this, - host_t *src, host_t *dst, - protocol_id_t protocol, u_int32_t reqid, - u_int32_t *spi) -{ - unsigned char request[BUFFER_SIZE]; - struct nlmsghdr *hdr, *out; - struct xfrm_userspi_info *userspi; - u_int32_t received_spi = 0; - size_t len; - - memset(&request, 0, sizeof(request)); - - DBG2(DBG_KNL, "getting SPI for reqid %d", reqid); - - 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 = (protocol == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH; - userspi->info.mode = TRUE; /* tunnel mode */ - userspi->info.reqid = reqid; - userspi->info.family = src->get_family(src); - userspi->min = 0xc0000000; - userspi->max = 0xcFFFFFFF; - - if (netlink_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) - { - DBG1(DBG_KNL, "unable to get SPI for reqid %d", reqid); - return FAILED; - } - - DBG2(DBG_KNL, "got SPI 0x%x for reqid %d", received_spi, reqid); - - *spi = received_spi; - return SUCCESS; -} - -/** - * Implementation of kernel_interface_t.add_sa. - */ -static status_t add_sa(private_kernel_interface_t *this, - host_t *src, host_t *dst, u_int32_t spi, - protocol_id_t protocol, u_int32_t reqid, - u_int64_t expire_soft, u_int64_t expire_hard, - algorithm_t *enc_alg, algorithm_t *int_alg, - prf_plus_t *prf_plus, natt_conf_t *natt, mode_t mode, - bool replace) -{ - unsigned char request[BUFFER_SIZE]; - char *alg_name; - u_int key_size; - struct nlmsghdr *hdr; - struct xfrm_usersa_info *sa; - - memset(&request, 0, sizeof(request)); - - DBG2(DBG_KNL, "adding SAD entry with SPI 0x%x", spi); - - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; - hdr->nlmsg_type = replace ? 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 == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH; - sa->family = src->get_family(src); - sa->mode = mode; - sa->replay_window = 32; - sa->reqid = reqid; - /* we currently do not expire SAs by volume/packet count */ - sa->lft.soft_byte_limit = XFRM_INF; - sa->lft.hard_byte_limit = XFRM_INF; - sa->lft.soft_packet_limit = XFRM_INF; - sa->lft.hard_packet_limit = XFRM_INF; - /* we use lifetimes since added, not since used */ - sa->lft.soft_add_expires_seconds = expire_soft; - sa->lft.hard_add_expires_seconds = expire_hard; - sa->lft.soft_use_expires_seconds = 0; - sa->lft.hard_use_expires_seconds = 0; - - struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_usersa_info); - - if (enc_alg->algorithm != ENCR_UNDEFINED) - { - rthdr->rta_type = XFRMA_ALG_CRYPT; - alg_name = lookup_algorithm(encryption_algs, enc_alg, &key_size); - if (alg_name == NULL) - { - DBG1(DBG_KNL, "algorithm %N not supported by kernel!", - encryption_algorithm_names, enc_alg->algorithm); - return FAILED; - } - DBG2(DBG_KNL, " using encryption algorithm %N with key size %d", - encryption_algorithm_names, enc_alg->algorithm, key_size); - - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + key_size); - 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 = key_size; - strcpy(algo->alg_name, alg_name); - prf_plus->get_bytes(prf_plus, key_size / 8, algo->alg_key); - - rthdr = XFRM_RTA_NEXT(rthdr); - } - - if (int_alg->algorithm != AUTH_UNDEFINED) - { - rthdr->rta_type = XFRMA_ALG_AUTH; - alg_name = lookup_algorithm(integrity_algs, int_alg, &key_size); - if (alg_name == NULL) - { - DBG1(DBG_KNL, "algorithm %N not supported by kernel!", - integrity_algorithm_names, int_alg->algorithm); - return FAILED; - } - DBG2(DBG_KNL, " using integrity algorithm %N with key size %d", - integrity_algorithm_names, int_alg->algorithm, key_size); - - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + key_size); - 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 = key_size; - strcpy(algo->alg_name, alg_name); - prf_plus->get_bytes(prf_plus, key_size / 8, algo->alg_key); - - rthdr = XFRM_RTA_NEXT(rthdr); - } - - /* TODO: add IPComp here */ - - if (natt) - { - 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; - } - - struct xfrm_encap_tmpl* encap = (struct xfrm_encap_tmpl*)RTA_DATA(rthdr); - encap->encap_type = UDP_ENCAP_ESPINUDP; - encap->encap_sport = htons(natt->sport); - encap->encap_dport = htons(natt->dport); - memset(&encap->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 (netlink_send_ack(this->socket_xfrm, hdr) != SUCCESS) - { - DBG1(DBG_KNL, "unalbe to add SAD entry with SPI 0x%x", spi); - return FAILED; - } - return SUCCESS; -} - -/** - * Implementation of kernel_interface_t.update_sa. - */ -static status_t update_sa(private_kernel_interface_t *this, - host_t *src, host_t *dst, - host_t *new_src, host_t *new_dst, - host_diff_t src_changes, host_diff_t dst_changes, - u_int32_t spi, protocol_id_t protocol) -{ - unsigned char request[BUFFER_SIZE]; - struct nlmsghdr *hdr, *out = NULL; - struct xfrm_usersa_id *sa_id; - struct xfrm_usersa_info *sa = NULL; - size_t len; - - memset(&request, 0, sizeof(request)); - - DBG2(DBG_KNL, "querying SAD entry with SPI 0x%x", 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 == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH; - sa_id->family = dst->get_family(dst); - - if (netlink_send(this->socket_xfrm, hdr, &out, &len) == SUCCESS) - { - hdr = out; - while (NLMSG_OK(hdr, len)) - { - switch (hdr->nlmsg_type) - { - case XFRM_MSG_NEWSA: - { - 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 (sa == NULL) - { - DBG1(DBG_KNL, "unable to update SAD entry with SPI 0x%x", spi); - free(out); - return FAILED; - } - - DBG2(DBG_KNL, "updating SAD entry with SPI 0x%x", spi); - - hdr = out; - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; - hdr->nlmsg_type = XFRM_MSG_UPDSA; - - if (src_changes & HOST_DIFF_ADDR) - { - host2xfrm(new_src, &sa->saddr); - } - - if (dst_changes & HOST_DIFF_ADDR) - { - hdr->nlmsg_type = XFRM_MSG_NEWSA; - host2xfrm(new_dst, &sa->id.daddr); - } - - if (src_changes & HOST_DIFF_PORT || dst_changes & HOST_DIFF_PORT) - { - struct rtattr *rtattr = XFRM_RTA(hdr, struct xfrm_usersa_info); - size_t rtsize = XFRM_PAYLOAD(hdr, struct xfrm_usersa_info); - while (RTA_OK(rtattr, rtsize)) - { - if (rtattr->rta_type == XFRMA_ENCAP) - { - struct xfrm_encap_tmpl* encap; - encap = (struct xfrm_encap_tmpl*)RTA_DATA(rtattr); - encap->encap_sport = ntohs(new_src->get_port(new_src)); - encap->encap_dport = ntohs(new_dst->get_port(new_dst)); - break; - } - rtattr = RTA_NEXT(rtattr, rtsize); - } - } - if (netlink_send_ack(this->socket_xfrm, hdr) != SUCCESS) - { - DBG1(DBG_KNL, "unalbe to update SAD entry with SPI 0x%x", spi); - free(out); - return FAILED; - } - free(out); - - if (dst_changes & HOST_DIFF_ADDR) - { - return this->public.del_sa(&this->public, dst, spi, protocol); - } - return SUCCESS; -} - -/** - * Implementation of kernel_interface_t.query_sa. - */ -static status_t query_sa(private_kernel_interface_t *this, host_t *dst, - u_int32_t spi, protocol_id_t protocol, - u_int32_t *use_time) -{ - unsigned char request[BUFFER_SIZE]; - struct nlmsghdr *out = NULL, *hdr; - struct xfrm_usersa_id *sa_id; - struct xfrm_usersa_info *sa = NULL; - size_t len; - - DBG2(DBG_KNL, "querying SAD entry with SPI 0x%x", spi); - memset(&request, 0, sizeof(request)); - - 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_info)); - - sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr); - host2xfrm(dst, &sa_id->daddr); - sa_id->spi = spi; - sa_id->proto = (protocol == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH; - sa_id->family = dst->get_family(dst); - - if (netlink_send(this->socket_xfrm, hdr, &out, &len) == SUCCESS) - { - hdr = out; - while (NLMSG_OK(hdr, len)) - { - switch (hdr->nlmsg_type) - { - case XFRM_MSG_NEWSA: - { - 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 (sa == NULL) - { - DBG1(DBG_KNL, "unable to query SAD entry with SPI 0x%x", spi); - free(out); - return FAILED; - } - - *use_time = sa->curlft.use_time; - free (out); - return SUCCESS; -} - -/** - * Implementation of kernel_interface_t.del_sa. - */ -static status_t del_sa(private_kernel_interface_t *this, host_t *dst, - u_int32_t spi, protocol_id_t protocol) -{ - unsigned char request[BUFFER_SIZE]; - struct nlmsghdr *hdr; - struct xfrm_usersa_id *sa_id; - - memset(&request, 0, sizeof(request)); - - DBG2(DBG_KNL, "deleting SAD entry with SPI 0x%x", 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 == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH; - sa_id->family = dst->get_family(dst); - - if (netlink_send_ack(this->socket_xfrm, hdr) != SUCCESS) - { - DBG1(DBG_KNL, "unalbe to delete SAD entry with SPI 0x%x", spi); - return FAILED; - } - DBG2(DBG_KNL, "deleted SAD entry with SPI 0x%x", spi); - return SUCCESS; -} - -/** - * Implementation of kernel_interface_t.add_policy. - */ -static status_t add_policy(private_kernel_interface_t *this, - host_t *src, host_t *dst, - traffic_selector_t *src_ts, - traffic_selector_t *dst_ts, - policy_dir_t direction, protocol_id_t protocol, - u_int32_t reqid, bool high_prio, mode_t mode, - bool update) -{ - iterator_t *iterator; - policy_entry_t *current, *policy; - bool found = FALSE; - unsigned char request[BUFFER_SIZE]; - 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->direction = direction; - - /* find the policy, which matches EXACTLY */ - pthread_mutex_lock(&this->policies_mutex); - iterator = this->policies->create_iterator(this->policies, TRUE); - while (iterator->iterate(iterator, (void**)¤t)) - { - if (memcmp(¤t->sel, &policy->sel, sizeof(struct xfrm_selector)) == 0 && - policy->direction == current->direction) - { - /* use existing policy */ - if (!update) - { - current->refcount++; - DBG2(DBG_KNL, "policy %R===%R already exists, increasing ", - "refcount", src_ts, dst_ts); - } - free(policy); - policy = current; - found = TRUE; - break; - } - } - iterator->destroy(iterator); - if (!found) - { /* apply the new one, if we have no such policy */ - this->policies->insert_last(this->policies, policy); - policy->refcount = 1; - } - - DBG2(DBG_KNL, "adding policy %R===%R", src_ts, dst_ts); - - memset(&request, 0, sizeof(request)); - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; - hdr->nlmsg_type = XFRM_MSG_UPDPOLICY; - 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 = high_prio ? PRIO_HIGH : PRIO_LOW; - 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; - pthread_mutex_unlock(&this->policies_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 = sizeof(struct xfrm_user_tmpl); - rthdr->rta_len = RTA_LENGTH(rthdr->rta_len); - - 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); - tmpl->reqid = reqid; - tmpl->id.proto = (protocol == PROTO_AH) ? KERNEL_AH : KERNEL_ESP; - tmpl->aalgos = tmpl->ealgos = tmpl->calgos = ~0; - tmpl->mode = mode; - tmpl->family = src->get_family(src); - - host2xfrm(src, &tmpl->saddr); - host2xfrm(dst, &tmpl->id.daddr); - - if (netlink_send_ack(this->socket_xfrm, hdr) != SUCCESS) - { - DBG1(DBG_KNL, "unable to add policy %R===%R", src_ts, dst_ts); - 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 mode - * - we are not using IPv6 (does not work correctly yet!) - */ - if (policy->route == NULL && direction == POLICY_FWD && - mode != MODE_TRANSPORT && src->get_family(src) != AF_INET6) - { - policy->route = malloc_thing(route_entry_t); - if (get_address_by_ts(this, dst_ts, &policy->route->src_ip) == SUCCESS) - { - policy->route->if_index = get_interface_index(this, dst); - policy->route->dst_net = chunk_alloc(policy->sel.family == AF_INET ? 4 : 16); - memcpy(policy->route->dst_net.ptr, &policy->sel.saddr, policy->route->dst_net.len); - policy->route->prefixlen = policy->sel.prefixlen_s; - - if (manage_srcroute(this, RTM_NEWROUTE, NLM_F_CREATE | NLM_F_EXCL, - policy->route) != SUCCESS) - { - DBG1(DBG_KNL, "unable to install source route for %H", - policy->route->src_ip); - route_entry_destroy(policy->route); - policy->route = NULL; - } - } - else - { - free(policy->route); - policy->route = NULL; - } - } - - return SUCCESS; -} - -/** - * Implementation of kernel_interface_t.query_policy. - */ -static status_t query_policy(private_kernel_interface_t *this, - traffic_selector_t *src_ts, - traffic_selector_t *dst_ts, - policy_dir_t direction, u_int32_t *use_time) -{ - unsigned char request[BUFFER_SIZE]; - struct nlmsghdr *out = NULL, *hdr; - struct xfrm_userpolicy_id *policy_id; - struct xfrm_userpolicy_info *policy = NULL; - size_t len; - - memset(&request, 0, sizeof(request)); - - DBG2(DBG_KNL, "querying policy %R===%R", src_ts, dst_ts); - - 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 (netlink_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", src_ts, dst_ts); - free(out); - return FAILED; - } - *use_time = (time_t)policy->curlft.use_time; - - free(out); - return SUCCESS; -} - -/** - * Implementation of kernel_interface_t.del_policy. - */ -static status_t del_policy(private_kernel_interface_t *this, - traffic_selector_t *src_ts, - traffic_selector_t *dst_ts, - policy_dir_t direction) -{ - policy_entry_t *current, policy, *to_delete = NULL; - route_entry_t *route; - unsigned char request[BUFFER_SIZE]; - struct nlmsghdr *hdr; - struct xfrm_userpolicy_id *policy_id; - iterator_t *iterator; - - DBG2(DBG_KNL, "deleting policy %R===%R", src_ts, dst_ts); - - /* create a policy */ - memset(&policy, 0, sizeof(policy_entry_t)); - policy.sel = ts2selector(src_ts, dst_ts); - policy.direction = direction; - - /* find the policy */ - pthread_mutex_lock(&this->policies_mutex); - iterator = this->policies->create_iterator(this->policies, TRUE); - while (iterator->iterate(iterator, (void**)¤t)) - { - if (memcmp(¤t->sel, &policy.sel, sizeof(struct xfrm_selector)) == 0 && - policy.direction == current->direction) - { - 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"); - iterator->destroy(iterator); - pthread_mutex_unlock(&this->policies_mutex); - return SUCCESS; - } - /* remove if last reference */ - iterator->remove(iterator); - break; - } - } - iterator->destroy(iterator); - pthread_mutex_unlock(&this->policies_mutex); - if (!to_delete) - { - DBG1(DBG_KNL, "deleting policy %R===%R failed, not found", src_ts, dst_ts); - 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; - - route = to_delete->route; - free(to_delete); - - if (netlink_send_ack(this->socket_xfrm, hdr) != SUCCESS) - { - DBG1(DBG_KNL, "unable to delete policy %R===%R", src_ts, dst_ts); - return FAILED; - } - - if (route) - { - if (manage_srcroute(this, RTM_DELROUTE, 0, route) != SUCCESS) - { - DBG1(DBG_KNL, "error uninstalling route installed with " - "policy %R===%R", src_ts, dst_ts); - } - route_entry_destroy(route); - } - return SUCCESS; -} - -/** - * Implementation of kernel_interface_t.destroy. - */ -static void destroy(private_kernel_interface_t *this) -{ - pthread_cancel(this->event_thread); - pthread_join(this->event_thread, NULL); - close(this->socket_xfrm_events); - close(this->socket_xfrm); - close(this->socket_rt); - this->vips->destroy(this->vips); - this->policies->destroy(this->policies); - free(this); -} - -/* - * Described in header. - */ -kernel_interface_t *kernel_interface_create() -{ - private_kernel_interface_t *this = malloc_thing(private_kernel_interface_t); - struct sockaddr_nl addr; - - /* public functions */ - this->public.get_spi = (status_t(*)(kernel_interface_t*,host_t*,host_t*,protocol_id_t,u_int32_t,u_int32_t*))get_spi; - this->public.add_sa = (status_t(*)(kernel_interface_t *,host_t*,host_t*,u_int32_t,protocol_id_t,u_int32_t,u_int64_t,u_int64_t,algorithm_t*,algorithm_t*,prf_plus_t*,natt_conf_t*,mode_t,bool))add_sa; - this->public.update_sa = (status_t(*)(kernel_interface_t*,host_t*,u_int32_t,protocol_id_t,host_t*,host_t*,host_diff_t,host_diff_t))update_sa; - this->public.query_sa = (status_t(*)(kernel_interface_t*,host_t*,u_int32_t,protocol_id_t,u_int32_t*))query_sa; - this->public.del_sa = (status_t(*)(kernel_interface_t*,host_t*,u_int32_t,protocol_id_t))del_sa; - this->public.add_policy = (status_t(*)(kernel_interface_t*,host_t*,host_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t,protocol_id_t,u_int32_t,bool,mode_t,bool))add_policy; - this->public.query_policy = (status_t(*)(kernel_interface_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t,u_int32_t*))query_policy; - this->public.del_policy = (status_t(*)(kernel_interface_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t))del_policy; - - this->public.get_interface = (char*(*)(kernel_interface_t*,host_t*))get_interface_name; - this->public.create_address_list = (linked_list_t*(*)(kernel_interface_t*))create_address_list_public; - this->public.add_ip = (status_t(*)(kernel_interface_t*,host_t*,host_t*)) add_ip; - this->public.del_ip = (status_t(*)(kernel_interface_t*,host_t*,host_t*)) del_ip; - this->public.destroy = (void(*)(kernel_interface_t*)) destroy; - - /* private members */ - this->vips = linked_list_create(); - this->policies = linked_list_create(); - pthread_mutex_init(&this->policies_mutex,NULL); - pthread_mutex_init(&this->vips_mutex,NULL); - - addr.nl_family = AF_NETLINK; - addr.nl_pid = 0; - addr.nl_groups = 0; - - /* create and bind XFRM socket */ - this->socket_xfrm = socket(AF_NETLINK, SOCK_RAW, NETLINK_XFRM); - if (this->socket_xfrm <= 0) - { - charon->kill(charon, "unable to create XFRM netlink socket"); - } - - if (bind(this->socket_xfrm, (struct sockaddr*)&addr, sizeof(addr))) - { - charon->kill(charon, "unable to bind XFRM netlink socket"); - } - - /* create and bind RT socket */ - this->socket_rt = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); - if (this->socket_rt <= 0) - { - charon->kill(charon, "unable to create RT netlink socket"); - } - - if (bind(this->socket_rt, (struct sockaddr*)&addr, sizeof(addr))) - { - charon->kill(charon, "unable to bind RT netlink socket"); - } - - /* create and bind XFRM socket for ACQUIRE & EXPIRE */ - addr.nl_groups = XFRMGRP_ACQUIRE | XFRMGRP_EXPIRE; - this->socket_xfrm_events = socket(AF_NETLINK, SOCK_RAW, NETLINK_XFRM); - if (this->socket_xfrm_events <= 0) - { - charon->kill(charon, "unable to create XFRM event socket"); - } - - if (bind(this->socket_xfrm_events, (struct sockaddr*)&addr, sizeof(addr))) - { - charon->kill(charon, "unable to bind XFRM event socket"); - } - - /* create a thread receiving ACQUIRE & EXPIRE events */ - if (pthread_create(&this->event_thread, NULL, - (void*(*)(void*))receive_events, this)) - { - charon->kill(charon, "unable to create xfrm event dispatcher thread"); - } - - return &this->public; -} - -/* vim: set ts=4 sw=4 noet: */ |