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strongswan/src/charon/kernel/kernel_interface.c

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/*
* Copyright (C) 2006-2008 Tobias Brunner
* Copyright (C) 2005-2007 Martin Willi
* 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.
*
* $Id$
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/xfrm.h>
#include <linux/udp.h>
#include <netinet/in.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 <processing/jobs/delete_child_sa_job.h>
#include <processing/jobs/rekey_child_sa_job.h>
#include <processing/jobs/acquire_job.h>
#include <processing/jobs/callback_job.h>
#include <processing/jobs/roam_job.h>
/** required for Linux 2.6.26 kernel and later */
#ifndef XFRM_STATE_AF_UNSPEC
#define XFRM_STATE_AF_UNSPEC 32
#endif
/** routing table for routes installed by us */
#ifndef IPSEC_ROUTING_TABLE
#define IPSEC_ROUTING_TABLE 100
#endif
#ifndef IPSEC_ROUTING_TABLE_PRIO
#define IPSEC_ROUTING_TABLE_PRIO 100
#endif
/** default priority of installed policies */
#define PRIO_LOW 3000
#define PRIO_HIGH 2000
/** delay before firing roam jobs (ms) */
#define ROAM_DELAY 100
#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
*/
static 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}, */
{ENCR_AES_CCM_ICV8, "rfc4309(ccm(aes))", 64}, /* key_size = ICV size */
{ENCR_AES_CCM_ICV12, "rfc4309(ccm(aes))", 96}, /* key_size = ICV size */
{ENCR_AES_CCM_ICV16, "rfc4309(ccm(aes))", 128}, /* key_size = ICV size */
{ENCR_AES_GCM_ICV8, "rfc4106(gcm(aes))", 64}, /* key_size = ICV size */
{ENCR_AES_GCM_ICV12, "rfc4106(gcm(aes))", 96}, /* key_size = ICV size */
{ENCR_AES_GCM_ICV16, "rfc4106(gcm(aes))", 128}, /* key_size = ICV size */
{END_OF_LIST, NULL, 0},
};
/**
* Algorithms for integrity protection
*/
static 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, "xcbc(aes)", 128},
{END_OF_LIST, NULL, 0},
};
/**
* Algorithms for IPComp
*/
static kernel_algorithm_t compression_algs[] = {
/* {IPCOMP_OUI, "***", 0}, */
{IPCOMP_DEFLATE, "deflate", 0},
{IPCOMP_LZS, "lzs", 0},
{IPCOMP_LZJH, "lzjh", 0},
{END_OF_LIST, NULL, 0},
};
/**
* Look up a kernel algorithm name and its key size
*/
static char* lookup_algorithm(kernel_algorithm_t *kernel_algo,
u_int16_t ikev2_algo, u_int16_t *key_size)
{
while (kernel_algo->ikev2_id != END_OF_LIST)
{
if (ikev2_algo == kernel_algo->ikev2_id)
{
/* match, evaluate key length */
if (key_size && *key_size == 0)
{ /* update key size if not set */
*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;
/** 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)
{
this->src_ip->destroy(this->src_ip);
this->gateway->destroy(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;
/** 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 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_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;
/**
* mutex to lock access to netlink socket
*/
pthread_mutex_t nl_mutex;
/**
* mutex to lock access to various lists
*/
pthread_mutex_t mutex;
/**
* condition variable to signal virtual IP add/removal
*/
pthread_cond_t cond;
/**
* List of installed policies (policy_entry_t)
*/
linked_list_t *policies;
/**
* Cached list of interfaces and its adresses (iface_entry_t)
*/
linked_list_t *ifaces;
/**
* iterator used in hook()
*/
iterator_t *hiter;
/**
* job receiving netlink events
*/
callback_job_t *job;
/**
* current sequence number for netlink request
*/
int seq;
/**
* Netlink xfrm socket (IPsec)
*/
int socket_xfrm;
/**
* netlink xfrm socket to receive acquire and expire events
*/
int socket_xfrm_events;
/**
* Netlink rt socket (routing)
*/
int socket_rt;
/**
* Netlink rt socket to receive address change events
*/
int socket_rt_events;
/**
* time of the last roam_job
*/
struct timeval last_roam;
/**
* whether to install routes along policies
*/
bool install_routes;
/**
* routing table to install routes
*/
int routing_table;
/**
* priority of used routing table
*/
int routing_table_prio;
};
/**
* convert a IKEv2 specific protocol identifier to the kernel one
*/
static u_int8_t proto_ike2kernel(protocol_id_t proto)
{
switch (proto)
{
case PROTO_ESP:
return IPPROTO_ESP;
case PROTO_AH:
return IPPROTO_AH;
default:
return proto;
}
}
/**
* reverse of ike2kernel
*/
static protocol_id_t proto_kernel2ike(u_int8_t proto)
{
switch (proto)
{
case IPPROTO_ESP:
return PROTO_ESP;
case IPPROTO_AH:
return PROTO_AH;
default:
return proto;
}
}
/**
* 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;
}
/**
* process a XFRM_MSG_ACQUIRE from kernel
*/
static void process_acquire(private_kernel_interface_t *this, struct nlmsghdr *hdr)
{
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");
return;
}
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->processor->queue_job(charon->processor, job);
}
/**
* process a XFRM_MSG_EXPIRE from kernel
*/
static void process_expire(private_kernel_interface_t *this, struct nlmsghdr *hdr)
{
job_t *job;
protocol_id_t protocol;
u_int32_t spi, reqid;
struct xfrm_user_expire *expire;
expire = (struct xfrm_user_expire*)NLMSG_DATA(hdr);
protocol = proto_kernel2ike(expire->state.id.proto);
spi = expire->state.id.spi;
reqid = expire->state.reqid;
DBG2(DBG_KNL, "received a XFRM_MSG_EXPIRE");
if (protocol != PROTO_ESP && protocol != PROTO_AH)
{
DBG2(DBG_KNL, "ignoring XFRM_MSG_EXPIRE for SA 0x%x (reqid %d) which is "
"not a CHILD_SA", ntohl(spi), reqid);
return;
}
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->processor->queue_job(charon->processor, job);
}
/**
* start a roaming job. We delay it for a second and fire only one job
* for multiple events. Otherwise we would create two many jobs.
*/
static void fire_roam_job(private_kernel_interface_t *this, bool address)
{
struct timeval now;
if (gettimeofday(&now, NULL) == 0)
{
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;
charon->scheduler->schedule_job(charon->scheduler,
(job_t*)roam_job_create(address), ROAM_DELAY);
}
}
}
/**
* process RTM_NEWLINK/RTM_DELLINK from kernel
*/
static void process_link(private_kernel_interface_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);
iterator_t *iterator;
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)";
}
switch (hdr->nlmsg_type)
{
case RTM_NEWLINK:
{
if (msg->ifi_flags & IFF_LOOPBACK)
{ /* ignore loopback interfaces */
break;
}
iterator = this->ifaces->create_iterator_locked(this->ifaces,
&this->mutex);
while (iterator->iterate(iterator, (void**)&current))
{
if (current->ifindex == msg->ifi_index)
{
entry = current;
break;
}
}
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;
iterator->destroy(iterator);
break;
}
case RTM_DELLINK:
{
iterator = this->ifaces->create_iterator_locked(this->ifaces,
&this->mutex);
while (iterator->iterate(iterator, (void**)&current))
{
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;
}
}
iterator->destroy(iterator);
break;
}
}
/* send an update to all IKE_SAs */
if (update && event)
{
fire_roam_job(this, TRUE);
}
}
/**
* process RTM_NEWADDR/RTM_DELADDR from kernel
*/
static void process_addr(private_kernel_interface_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;
iterator_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;
}
ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
while (ifaces->iterate(ifaces, (void**)&iface))
{
if (iface->ifindex == msg->ifa_index)
{
addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
while (addrs->iterate(addrs, (void**)&addr))
{
if (host->ip_equals(host, addr->ip))
{
found = TRUE;
if (hdr->nlmsg_type == RTM_DELADDR)
{
changed = TRUE;
addrs->remove(addrs);
if (!addr->virtual)
{
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);
host->destroy(host);
/* send an update to all IKE_SAs */
if (update && event && changed)
{
fire_roam_job(this, TRUE);
}
}
/**
* Receives events from kernel
*/
static job_requeue_t receive_events(private_kernel_interface_t *this)
{
char response[1024];
struct nlmsghdr *hdr = (struct nlmsghdr*)response;
struct sockaddr_nl addr;
socklen_t addr_len = sizeof(addr);
int len, oldstate, maxfd, selected;
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(this->socket_xfrm_events, &rfds);
FD_SET(this->socket_rt_events, &rfds);
maxfd = max(this->socket_xfrm_events, this->socket_rt_events);
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &oldstate);
selected = select(maxfd + 1, &rfds, NULL, NULL, NULL);
pthread_setcancelstate(oldstate, NULL);
if (selected <= 0)
{
DBG1(DBG_KNL, "selecting on sockets failed: %s", strerror(errno));
return JOB_REQUEUE_FAIR;
}
if (FD_ISSET(this->socket_xfrm_events, &rfds))
{
selected = this->socket_xfrm_events;
}
else if (FD_ISSET(this->socket_rt_events, &rfds))
{
selected = this->socket_rt_events;
}
else
{
return JOB_REQUEUE_DIRECT;
}
len = recvfrom(selected, response, sizeof(response), MSG_DONTWAIT,
(struct sockaddr*)&addr, &addr_len);
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))
{
/* looks good so far, dispatch netlink message */
if (selected == this->socket_xfrm_events)
{
switch (hdr->nlmsg_type)
{
case XFRM_MSG_ACQUIRE:
process_acquire(this, hdr);
break;
case XFRM_MSG_EXPIRE:
process_expire(this, hdr);
break;
default:
break;
}
}
else if (selected == this->socket_rt_events)
{
switch (hdr->nlmsg_type)
{
case RTM_NEWADDR:
case RTM_DELADDR:
process_addr(this, hdr, TRUE);
pthread_cond_signal(&this->cond);
break;
case RTM_NEWLINK:
case RTM_DELLINK:
process_link(this, hdr, TRUE);
pthread_cond_signal(&this->cond);
break;
case RTM_NEWROUTE:
case RTM_DELROUTE:
fire_roam_job(this, FALSE);
break;
default:
break;
}
}
hdr = NLMSG_NEXT(hdr, len);
}
return JOB_REQUEUE_DIRECT;
}
/**
* send a netlink message and wait for a reply
*/
static status_t netlink_send(private_kernel_interface_t *this,
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;
pthread_mutex_lock(&this->nl_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;
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(&this->nl_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(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));
pthread_mutex_unlock(&this->nl_mutex);
return FAILED;
}
if (!NLMSG_OK(msg, len))
{
DBG1(DBG_KNL, "received corrupted netlink message");
pthread_mutex_unlock(&this->nl_mutex);
return FAILED;
}
if (msg->nlmsg_seq != this->seq)
{
DBG1(DBG_KNL, "received invalid netlink sequence number");
if (msg->nlmsg_seq < this->seq)
{
continue;
}
pthread_mutex_unlock(&this->nl_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 == this->seq)
{
/* seems to be multipart */
continue;
}
break;
}
*out_len = result.len;
*out = (struct nlmsghdr*)clalloc(result.ptr, result.len);
pthread_mutex_unlock(&this->nl_mutex);
return SUCCESS;
}
/**
* send a netlink message and wait for its acknowlegde
*/
static status_t netlink_send_ack(private_kernel_interface_t *this,
int socket, struct nlmsghdr *in)
{
struct nlmsghdr *out, *hdr;
size_t len;
if (netlink_send(this, 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;
}
/**
* Initialize a list of local addresses.
*/
static status_t init_address_list(private_kernel_interface_t *this)
{
char request[BUFFER_SIZE];
struct nlmsghdr *out, *current, *in;
struct rtgenmsg *msg;
size_t len;
iterator_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 (netlink_send(this, this->socket_rt, 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 (netlink_send(this, this->socket_rt, 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);
ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
while (ifaces->iterate(ifaces, (void**)&iface))
{
if (iface->flags & IFF_UP)
{
DBG1(DBG_KNL, " %s", iface->ifname);
addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
while (addrs->iterate(addrs, (void**)&addr))
{
DBG1(DBG_KNL, " %H", addr->ip);
}
addrs->destroy(addrs);
}
}
ifaces->destroy(ifaces);
return SUCCESS;
}
/**
* iterator hook to iterate over addrs
*/
static hook_result_t addr_hook(private_kernel_interface_t *this,
addr_entry_t *in, host_t **out)
{
if (in->virtual)
{ /* skip virtual interfaces added by us */
return HOOK_SKIP;
}
if (in->scope >= RT_SCOPE_LINK)
{ /* skip addresses with a unusable scope */
return HOOK_SKIP;
}
*out = in->ip;
return HOOK_NEXT;
}
/**
* iterator hook to iterate over ifaces
*/
static hook_result_t iface_hook(private_kernel_interface_t *this,
iface_entry_t *in, host_t **out)
{
if (!(in->flags & IFF_UP))
{ /* skip interfaces not up */
return HOOK_SKIP;
}
if (this->hiter == NULL)
{
this->hiter = in->addrs->create_iterator(in->addrs, TRUE);
this->hiter->set_iterator_hook(this->hiter,
(iterator_hook_t*)addr_hook, this);
}
while (this->hiter->iterate(this->hiter, (void**)out))
{
return HOOK_AGAIN;
}
this->hiter->destroy(this->hiter);
this->hiter = NULL;
return HOOK_SKIP;
}
/**
* Implements kernel_interface_t.create_address_iterator.
*/
static iterator_t *create_address_iterator(private_kernel_interface_t *this)
{
iterator_t *iterator;
/* This iterator is not only hooked, is is double-hooked. As we have stored
* our addresses in iface_entry->addr_entry->ip, we need to iterate the
* entries in each interface we iterate. This does the iface_hook. The
* addr_hook returns the ip instead of the addr_entry. */
iterator = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
iterator->set_iterator_hook(iterator, (iterator_hook_t*)iface_hook, this);
return iterator;
}
/**
* implementation of kernel_interface_t.get_interface_name
*/
static char *get_interface_name(private_kernel_interface_t *this, host_t* ip)
{
iterator_t *ifaces, *addrs;
iface_entry_t *iface;
addr_entry_t *addr;
char *name = NULL;
DBG2(DBG_KNL, "getting interface name for %H", ip);
ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
while (ifaces->iterate(ifaces, (void**)&iface))
{
addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
while (addrs->iterate(addrs, (void**)&addr))
{
if (ip->ip_equals(ip, addr->ip))
{
name = strdup(iface->ifname);
break;
}
}
addrs->destroy(addrs);
if (name)
{
break;
}
}
ifaces->destroy(ifaces);
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;
}
/**
* 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)
{
iterator_t *ifaces, *addrs;
iface_entry_t *iface;
addr_entry_t *addr;
host_t *host;
int family;
bool found = FALSE;
DBG2(DBG_KNL, "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_KNL, "using host %H", *ip);
return SUCCESS;
}
host->destroy(host);
ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
while (ifaces->iterate(ifaces, (void**)&iface))
{
addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
while (addrs->iterate(addrs, (void**)&addr))
{
if (ts->includes(ts, addr->ip))
{
found = TRUE;
*ip = addr->ip->clone(addr->ip);
break;
}
}
addrs->destroy(addrs);
if (found)
{
break;
}
}
ifaces->destroy(ifaces);
if (!found)
{
DBG1(DBG_KNL, "no local address found in traffic selector %R", ts);
return FAILED;
}
DBG2(DBG_KNL, "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)
{
iterator_t *ifaces, *addrs;
iface_entry_t *iface;
addr_entry_t *addr;
int ifindex = 0;
DBG2(DBG_KNL, "getting iface for %H", ip);
ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
while (ifaces->iterate(ifaces, (void**)&iface))
{
addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
while (addrs->iterate(addrs, (void**)&addr))
{
if (ip->ip_equals(ip, addr->ip))
{
ifindex = iface->ifindex;
break;
}
}
addrs->destroy(addrs);
if (ifindex)
{
break;
}
}
ifaces->destroy(ifaces);
if (ifindex == 0)
{
DBG1(DBG_KNL, "unable to get interface for %H", ip);
}
return ifindex;
}
/**
* get the refcount of a virtual ip
*/
static int get_vip_refcount(private_kernel_interface_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;
}
/**
* 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, 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 */
if (this->routing_table == 0 && 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.gateway = route->gateway;
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 = this->routing_table;
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 = route->gateway->get_address(route->gateway);
add_attribute(hdr, RTA_GATEWAY, 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, this->socket_rt, hdr);
}
/**
* create or delete an rule to use our routing table
*/
static status_t manage_rule(private_kernel_interface_t *this, int nlmsg_type,
u_int32_t table, u_int32_t prio)
{
unsigned char request[BUFFER_SIZE];
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 = AF_INET;
msg->rtm_protocol = RTPROT_BOOT;
msg->rtm_scope = RT_SCOPE_UNIVERSE;
msg->rtm_type = RTN_UNICAST;
chunk = chunk_from_thing(prio);
add_attribute(hdr, RTA_PRIORITY, chunk, sizeof(request));
return netlink_send_ack(this, this->socket_rt, hdr);
}
/**
* 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)
{
int bit, byte;
if (addr.len != net.len)
{
return FALSE;
}
/* scan through all bits, beginning in the front */
for (byte = 0; byte < addr.len; byte++)
{
for (bit = 7; bit >= 0; bit--)
{
/* check if bits are equal (or we reached the end of the net) */
if (bit + byte * 8 > net_len)
{
return TRUE;
}
if (((1<<bit) & addr.ptr[byte]) != ((1<<bit) & net.ptr[byte]))
{
return FALSE;
}
}
}
return TRUE;
}
/**
* Get a route: If "nexthop", the nexthop is returned. source addr otherwise.
*/
static host_t *get_route(private_kernel_interface_t *this, host_t *dest,
bool nexthop)
{
unsigned char request[BUFFER_SIZE];
struct nlmsghdr *hdr, *out, *current;
struct rtmsg *msg;
chunk_t chunk;
size_t len;
int best = -1;
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 | NLM_F_DUMP | NLM_F_ROOT;
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);
chunk = dest->get_address(dest);
add_attribute(hdr, RTA_DST, chunk, sizeof(request));
if (netlink_send(this, this->socket_rt, hdr, &out, &len) != SUCCESS)
{
DBG1(DBG_KNL, "getting address to %H failed", dest);
return NULL;
}
current = out;
while (NLMSG_OK(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;
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);
}
/* apply the route if:
* - it is not from our own ipsec routing table
* - is better than a previous one
* - is the default route or
* - its destination net contains our destination
*/
if ((this->routing_table == 0 ||msg->rtm_table != this->routing_table)
&& msg->rtm_dst_len > best
&& (msg->rtm_dst_len == 0 || /* default route */
(rta_dst.ptr && addr_in_subnet(chunk, rta_dst, msg->rtm_dst_len))))
{
iterator_t *ifaces, *addrs;
iface_entry_t *iface;
addr_entry_t *addr;
best = msg->rtm_dst_len;
if (nexthop)
{
DESTROY_IF(gtw);
gtw = host_create_from_chunk(msg->rtm_family, rta_gtw, 0);
}
else if (rta_src.ptr)
{
DESTROY_IF(src);
src = host_create_from_chunk(msg->rtm_family, rta_src, 0);
if (get_vip_refcount(this, src))
{ /* skip source address if it is installed by us */
DESTROY_IF(src);
src = NULL;
current = NLMSG_NEXT(current, len);
continue;
}
}
else
{
/* no source addr, get one from the interfaces */
ifaces = this->ifaces->create_iterator_locked(
this->ifaces, &this->mutex);
while (ifaces->iterate(ifaces, (void**)&iface))
{
if (iface->ifindex == rta_oif)
{
addrs = iface->addrs->create_iterator(
iface->addrs, TRUE);
while (addrs->iterate(addrs, (void**)&addr))
{
chunk_t ip = addr->ip->get_address(addr->ip);
if (msg->rtm_dst_len == 0
|| addr_in_subnet(ip, rta_dst, msg->rtm_dst_len))
{
DESTROY_IF(src);
src = addr->ip->clone(addr->ip);
break;
}
}
addrs->destroy(addrs);
}
}
ifaces->destroy(ifaces);
}
}
/* FALL through */
}
default:
current = NLMSG_NEXT(current, len);
continue;
}
break;
}
free(out);
if (nexthop)
{
if (gtw)
{
return gtw;
}
return dest->clone(dest);
}
return src;
}
/**
* Implementation of kernel_interface_t.get_source_addr.
*/
static host_t* get_source_addr(private_kernel_interface_t *this, host_t *dest)
{
return get_route(this, dest, FALSE);
}
/**
* 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)
{
iface_entry_t *iface;
addr_entry_t *addr;
iterator_t *addrs, *ifaces;
int ifindex;
DBG2(DBG_KNL, "adding virtual IP %H", virtual_ip);
ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
while (ifaces->iterate(ifaces, (void**)&iface))
{
bool iface_found = FALSE;
addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
while (addrs->iterate(addrs, (void**)&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);
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 */
pthread_cond_wait(&this->cond, &this->mutex);
}
ifaces->destroy(ifaces);
return SUCCESS;
}
ifaces->destroy(ifaces);
DBG1(DBG_KNL, "adding virtual IP %H failed", virtual_ip);
return FAILED;
}
}
ifaces->destroy(ifaces);
DBG1(DBG_KNL, "interface address %H not found, unable to install"
"virtual IP %H", iface_ip, virtual_ip);
return FAILED;
}
/**
* Implementation of kernel_interface_t.del_ip.
*/
static status_t del_ip(private_kernel_interface_t *this, host_t *virtual_ip)
{
iface_entry_t *iface;
addr_entry_t *addr;
iterator_t *addrs, *ifaces;
status_t status;
int ifindex;
DBG2(DBG_KNL, "deleting virtual IP %H", virtual_ip);
ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
while (ifaces->iterate(ifaces, (void**)&iface))
{
addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
while (addrs->iterate(addrs, (void**)&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)
{
pthread_cond_wait(&this->cond, &this->mutex);
}
}
addrs->destroy(addrs);
ifaces->destroy(ifaces);
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);
return SUCCESS;
}
}
addrs->destroy(addrs);
}
ifaces->destroy(ifaces);
DBG2(DBG_KNL, "virtual IP %H not cached, unable to delete", virtual_ip);
return FAILED;
}
/**
* Get an SPI for a specific protocol from the kernel.
*/
static status_t get_spi_internal(private_kernel_interface_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)
{
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));
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 = TRUE; /* tunnel mode */
userspi->info.reqid = reqid;
userspi->info.family = src->get_family(src);
userspi->min = min;
userspi->max = max;
if (netlink_send(this, 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;
}
/**
* 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)
{
DBG2(DBG_KNL, "getting SPI for reqid %d", reqid);
if (get_spi_internal(this, src, dst, proto_ike2kernel(protocol),
0xc0000000, 0xcFFFFFFF, reqid, spi) != SUCCESS)
{
DBG1(DBG_KNL, "unable to get SPI for reqid %d", reqid);
return FAILED;
}
DBG2(DBG_KNL, "got SPI 0x%x for reqid %d", *spi, reqid);
return SUCCESS;
}
/**
* Implementation of kernel_interface_t.get_cpi.
*/
static status_t get_cpi(private_kernel_interface_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 %d", 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 %d", reqid);
return FAILED;
}
*cpi = htons((u_int16_t)ntohl(received_spi));
DBG2(DBG_KNL, "got CPI 0x%x for reqid %d", *cpi, reqid);
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,
u_int16_t enc_alg, u_int16_t enc_size,
u_int16_t int_alg, u_int16_t int_size,
prf_plus_t *prf_plus, mode_t mode,
u_int16_t ipcomp, bool encap,
bool replace)
{
unsigned char request[BUFFER_SIZE];
char *alg_name;
/* additional 4 octets KEYMAT required for AES-GCM as of RFC4106 8.1. */
u_int16_t add_keymat = 32;
struct nlmsghdr *hdr;
struct xfrm_usersa_info *sa;
memset(&request, 0, sizeof(request));
DBG2(DBG_KNL, "adding SAD entry with SPI 0x%x and reqid %d", spi, reqid);
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 = proto_ike2kernel(protocol);
sa->family = src->get_family(src);
sa->mode = mode;
sa->replay_window = (protocol == IPPROTO_COMP) ? 0 : 32;
sa->flags |= XFRM_STATE_AF_UNSPEC;
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);
switch (enc_alg)
{
case ENCR_UNDEFINED:
/* no encryption */
break;
case ENCR_AES_CCM_ICV8:
case ENCR_AES_CCM_ICV12:
case ENCR_AES_CCM_ICV16:
/* AES-CCM needs only 3 additional octets KEYMAT as of RFC 4309 7.1. */
add_keymat = 24;
/* fall-through */
case ENCR_AES_GCM_ICV8:
case ENCR_AES_GCM_ICV12:
case ENCR_AES_GCM_ICV16:
{
u_int16_t icv_size = 0;
rthdr->rta_type = XFRMA_ALG_AEAD;
alg_name = lookup_algorithm(encryption_algs, enc_alg, &icv_size);
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_size);
/* additional KEYMAT required */
enc_size += add_keymat;
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo_aead) + enc_size / 8);
hdr->nlmsg_len += rthdr->rta_len;
if (hdr->nlmsg_len > sizeof(request))
{
return FAILED;
}
struct xfrm_algo_aead* algo = (struct xfrm_algo_aead*)RTA_DATA(rthdr);
algo->alg_key_len = enc_size;
algo->alg_icv_len = icv_size;
strcpy(algo->alg_name, alg_name);
prf_plus->get_bytes(prf_plus, enc_size / 8, algo->alg_key);
rthdr = XFRM_RTA_NEXT(rthdr);
break;
}
default:
{
rthdr->rta_type = XFRMA_ALG_CRYPT;
alg_name = lookup_algorithm(encryption_algs, enc_alg, &enc_size);
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_size);
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + enc_size / 8);
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 = enc_size;
strcpy(algo->alg_name, alg_name);
prf_plus->get_bytes(prf_plus, enc_size / 8, algo->alg_key);
rthdr = XFRM_RTA_NEXT(rthdr);
break;
}
}
if (int_alg != AUTH_UNDEFINED)
{
rthdr->rta_type = XFRMA_ALG_AUTH;
alg_name = lookup_algorithm(integrity_algs, int_alg, &int_size);
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_size);
rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + int_size / 8);
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 = int_size;
strcpy(algo->alg_name, alg_name);
prf_plus->get_bytes(prf_plus, int_size / 8, algo->alg_key);
rthdr = XFRM_RTA_NEXT(rthdr);
}
if (ipcomp != IPCOMP_NONE)
{
rthdr->rta_type = XFRMA_ALG_COMP;
alg_name = lookup_algorithm(compression_algs, ipcomp, NULL);
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)
{
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* 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 (netlink_send_ack(this, this->socket_xfrm, hdr) != SUCCESS)
{
DBG1(DBG_KNL, "unable to add SAD entry with SPI 0x%x", spi);
return FAILED;
}
return SUCCESS;
}
/**
* Get the replay state (i.e. sequence numbers) of an SA.
*/
static status_t get_replay_state(private_kernel_interface_t *this,
u_int32_t spi, protocol_id_t protocol, host_t *dst,
struct xfrm_replay_state *replay)
{
unsigned char request[BUFFER_SIZE];
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 0x%x", spi);
hdr = (struct nlmsghdr*)request;
hdr->nlmsg_flags = NLM_F_REQUEST;
hdr->nlmsg_type = XFRM_MSG_GETAE;
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
aevent_id = (struct xfrm_aevent_id*)NLMSG_DATA(hdr);
aevent_id->flags = XFRM_AE_RVAL;
host2xfrm(dst, &aevent_id->sa_id.daddr);
aevent_id->sa_id.spi = spi;
aevent_id->sa_id.proto = proto_ike2kernel(protocol);
aevent_id->sa_id.family = dst->get_family(dst);
if (netlink_send(this, 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 0x%x", 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)
{
memcpy(replay, RTA_DATA(rta), rta->rta_len);
free(out);
return SUCCESS;
}
rta = RTA_NEXT(rta, rtasize);
}
DBG1(DBG_KNL, "unable to query replay state from SAD entry with SPI 0x%x", spi);
free(out);
return FAILED;
}
/**
* Implementation of kernel_interface_t.update_sa.
*/
static status_t update_sa(private_kernel_interface_t *this,
u_int32_t spi, protocol_id_t protocol,
host_t *src, host_t *dst,
host_t *new_src, host_t *new_dst, bool encap)
{
unsigned char request[BUFFER_SIZE], *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;
struct xfrm_replay_state replay;
memset(&request, 0, sizeof(request));
DBG2(DBG_KNL, "querying SAD entry with SPI 0x%x for update", spi);
/* query the exisiting SA first */
hdr = (struct nlmsghdr*)request;
hdr->nlmsg_flags = NLM_F_REQUEST;
hdr->nlmsg_type = XFRM_MSG_GETSA;
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id));
sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
host2xfrm(dst, &sa_id->daddr);
sa_id->spi = spi;
sa_id->proto = proto_ike2kernel(protocol);
sa_id->family = dst->get_family(dst);
if (netlink_send(this, 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 0x%x", spi);
free(out);
return FAILED;
}
/* try to get the replay state */
got_replay_state = (get_replay_state(
this, spi, protocol, dst, &replay) == SUCCESS);
/* delete the old SA */
if (this->public.del_sa(&this->public, dst, spi, protocol) != SUCCESS)
{
DBG1(DBG_KNL, "unable to delete old SAD entry with SPI 0x%x", spi);
free(out);
return FAILED;
}
DBG2(DBG_KNL, "updating SAD entry with SPI 0x%x from %#H..%#H to %#H..%#H",
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 || 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 && 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 (netlink_send_ack(this, this->socket_xfrm, hdr) != SUCCESS)
{
DBG1(DBG_KNL, "unable to update SAD entry with SPI 0x%x", spi);
free(out);
return FAILED;
}
free(out);
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 = proto_ike2kernel(protocol);
sa_id->family = dst->get_family(dst);
if (netlink_send(this, 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 = proto_ike2kernel(protocol);
sa_id->family = dst->get_family(dst);
if (netlink_send_ack(this, this->socket_xfrm, hdr) != SUCCESS)
{
DBG1(DBG_KNL, "unable 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,
u_int16_t ipcomp)
{
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->mutex);
iterator = this->policies->create_iterator(this->policies, TRUE);
while (iterator->iterate(iterator, (void**)&current))
{
if (memcmp(&current->sel, &policy->sel, sizeof(struct xfrm_selector)) == 0 &&
policy->direction == current->direction)
{
/* use existing policy */
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->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 = 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++;
}
tmpl->reqid = reqid;
tmpl->id.proto = proto_ike2kernel(protocol);
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, 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!)
* - routing is not disabled via strongswan.conf
*/
if (policy->route == NULL && direction == POLICY_FWD &&
mode != MODE_TRANSPORT && src->get_family(src) != AF_INET6 &&
this->install_routes)
{
policy->route = malloc_thing(route_entry_t);
if (get_address_by_ts(this, dst_ts, &policy->route->src_ip) == SUCCESS)
{
/* get the nexthop to src (src as we are in POLICY_FWD).*/
policy->route->gateway = get_route(this, src, TRUE);
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, 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 */
iterator = this->policies->create_iterator_locked(this->policies, &this->mutex);
while (iterator->iterate(iterator, (void**)&current))
{
if (memcmp(&current->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);
return SUCCESS;
}
/* remove if last reference */
iterator->remove(iterator);
break;
}
}
iterator->destroy(iterator);
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, 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)
{
if (this->routing_table)
{
manage_rule(this, RTM_DELRULE, this->routing_table,
this->routing_table_prio);
}
this->job->cancel(this->job);
close(this->socket_xfrm_events);
close(this->socket_xfrm);
close(this->socket_rt_events);
close(this->socket_rt);
this->policies->destroy(this->policies);
this->ifaces->destroy_function(this->ifaces, (void*)iface_entry_destroy);
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.get_cpi = (status_t(*)(kernel_interface_t*,host_t*,host_t*,u_int32_t,u_int16_t*))get_cpi;
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,u_int16_t,u_int16_t,u_int16_t,u_int16_t,prf_plus_t*,mode_t,u_int16_t,bool,bool))add_sa;
this->public.update_sa = (status_t(*)(kernel_interface_t*,u_int32_t,protocol_id_t,host_t*,host_t*,host_t*,host_t*,bool))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,u_int16_t))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_iterator = (iterator_t*(*)(kernel_interface_t*))create_address_iterator;
this->public.get_source_addr = (host_t*(*)(kernel_interface_t*, host_t *dest))get_source_addr;
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*)) del_ip;
this->public.destroy = (void(*)(kernel_interface_t*)) destroy;
/* private members */
this->policies = linked_list_create();
this->ifaces = linked_list_create();
this->hiter = NULL;
this->seq = 200;
pthread_mutex_init(&this->mutex, NULL);
pthread_mutex_init(&this->nl_mutex, NULL);
pthread_cond_init(&this->cond, NULL);
timerclear(&this->last_roam);
this->install_routes = lib->settings->get_bool(lib->settings,
"charon.install_routes", TRUE);
this->routing_table = lib->settings->get_int(lib->settings,
"charon.routing_table", IPSEC_ROUTING_TABLE);
this->routing_table_prio = lib->settings->get_int(lib->settings,
"charon.routing_table_prio", IPSEC_ROUTING_TABLE_PRIO);
memset(&addr, 0, sizeof(addr));
addr.nl_family = AF_NETLINK;
/* 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");
}
addr.nl_groups = 0;
if (bind(this->socket_rt, (struct sockaddr*)&addr, sizeof(addr)))
{
charon->kill(charon, "unable to bind RT netlink socket");
}
/* create and bind RT socket for events (address/interface/route changes) */
this->socket_rt_events = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if (this->socket_rt_events <= 0)
{
charon->kill(charon, "unable to create RT event socket");
}
addr.nl_groups = RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR |
RTMGRP_IPV4_ROUTE | RTMGRP_IPV4_ROUTE | RTMGRP_LINK;
if (bind(this->socket_rt_events, (struct sockaddr*)&addr, sizeof(addr)))
{
charon->kill(charon, "unable to bind RT event socket");
}
/* 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");
}
addr.nl_groups = 0;
if (bind(this->socket_xfrm, (struct sockaddr*)&addr, sizeof(addr)))
{
charon->kill(charon, "unable to bind XFRM netlink socket");
}
/* create and bind XFRM socket for ACQUIRE & 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");
}
addr.nl_groups = XFRMGRP_ACQUIRE | XFRMGRP_EXPIRE;
if (bind(this->socket_xfrm_events, (struct sockaddr*)&addr, sizeof(addr)))
{
charon->kill(charon, "unable to bind XFRM event socket");
}
this->job = callback_job_create((callback_job_cb_t)receive_events,
this, NULL, NULL);
charon->processor->queue_job(charon->processor, (job_t*)this->job);
if (init_address_list(this) != SUCCESS)
{
charon->kill(charon, "unable to get interface list");
}
if (this->routing_table)
{
if (manage_rule(this, RTM_NEWRULE, this->routing_table,
this->routing_table_prio) != SUCCESS)
{
DBG1(DBG_KNL, "unable to create routing table rule");
}
}
return &this->public;
}
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