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- kernel interface hacks, works partially

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- interface must be redefined
This commit is contained in:
Martin Willi
2005-12-05 16:09:42 +00:00
parent e70c7feb02
commit ba425b87dd
10 changed files with 504 additions and 186 deletions
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Source/charon/threads/kernel_interface.c
+341 -170
View File
@@ -25,13 +25,16 @@
#include <linux/netlink.h>
#include <linux/xfrm.h>
#include <pthread.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include "kernel_interface.h"
#include <daemon.h>
#include <utils/allocator.h>
#include <utils/linked_list.h>
#include <network/host.h>
#include <encoding/payloads/proposal_substructure.h>
typedef struct netlink_message_t netlink_message_t;
@@ -46,12 +49,20 @@ struct netlink_message_t {
union {
struct nlmsgerr e;
struct xfrm_userspi_info spi;
struct xfrm_usersa_info sa;
struct {
struct xfrm_usersa_info sa;
u_int8_t data[512];
};
};
u_int8_t data[];
};
typedef struct netlink_algo_t netlink_algo_t;
struct netlink_algo_t {
u_int16_t length;
u_int16_t type;
struct xfrm_algo algo;
};
typedef struct private_kernel_interface_t private_kernel_interface_t;
@@ -69,22 +80,34 @@ struct private_kernel_interface_t {
* netlink communication socket
*/
int socket;
/**
* since we use multiple threads, we can't call
* getpid multiple times. The pid is set once.
*/
pid_t pid;
int bc_socket;
pid_t pid;
/**
* sequence number for messages
*/
u_int32_t seq;
/**
* list of replies messages
* list of responded messages
*/
linked_list_t *replies;
linked_list_t *responses;
/**
* thread which receives messages
*/
pthread_t thread;
/**
* mutex locks access to replies list
*/
pthread_mutex_t mutex;
/**
* Condvar allows signaling of threads waiting for a reply
*/
pthread_cond_t condvar;
logger_t *logger;
/**
* Function for the thread, receives messages
@@ -94,171 +117,293 @@ struct private_kernel_interface_t {
/**
* Sends a netlink_message_t down to the kernel
*/
void (*send_message) (private_kernel_interface_t *this, netlink_message_t *request, netlink_message_t *response);
status_t (*send_message) (private_kernel_interface_t *this, netlink_message_t *request, netlink_message_t **response);
};
mapping_t kernel_encryption_algs_m[] = {
{ENCR_DES_IV64, ""},
{ENCR_DES, "des"},
{ENCR_3DES, "3des"},
{ENCR_RC5, ""},
{ENCR_IDEA, ""},
{ENCR_CAST, ""},
{ENCR_BLOWFISH, ""},
{ENCR_3IDEA, ""},
{ENCR_DES_IV32, ""},
{ENCR_NULL, ""},
{ENCR_AES_CBC, "aes"},
{ENCR_AES_CTR, ""},
{MAPPING_END, NULL}
};
mapping_t kernel_integrity_algs_m[] = {
{AUTH_HMAC_MD5_96, "md5"},
{AUTH_HMAC_SHA1_96, "sha1"},
{AUTH_DES_MAC, ""},
{AUTH_KPDK_MD5, ""},
{AUTH_AES_XCBC_96, ""},
{MAPPING_END, NULL}
};
//static u_int32_t get_spi(private_kernel_interface_t *this, host_t *src, host_t *dest, protocol_id_t protocol, bool tunnel_mode)
//{
// netlink_message_t request, response;
//
// memset(&request, 0, sizeof(request));
// request.hdr.nlmsg_flags = NLM_F_REQUEST;
// request.hdr.nlmsg_type = XFRM_MSG_ALLOCSPI;
// request.spi.info.saddr = src->get_xfrm_addr(src);
// request.spi.info.id.daddr = dest->get_xfrm_addr(dest);
// request.spi.info.mode = tunnel_mode;
// request.spi.info.id.proto = protocol;
// request.spi.info.family = src->get_family(src);
// request.spi.min = 0;
// request.spi.max = 50000;
// request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.spi)));
//
// this->send_message(this, &request, &response);
//
// if (response.hdr.nlmsg_type == NLMSG_ERROR)
// {
// /* error handling */
// }
// else if (response.hdr.nlmsg_len < NLMSG_LENGTH(sizeof(response.sa)))
// {
// /* error handling */
// }
//
// return response.sa.id.spi;
//}
//
//
//
//static status_t send_message(private_kernel_interface_t *this, netlink_message_t *request, netlink_message_t *response)
//{
// size_t length;
// ssize_t r;
//
// length = request->hdr.nlmsg_len;
//
//
//
//
//
// size_t len;
// ssize_t r;
//
//
//
// request->hdr.nlmsg_seq = ++this->seq;
// length = request->hdr.nlmsg_len;
//
// do {
// r = write(netlinkfd, hdr, len);
// } while (r < 0 && errno == EINTR);
//
// if (r < 0)
// {
// return FAILED;
// }
// else if ((size_t)r != len)
// {
// return FAILED;
// }
//
//
// /* wait for receiver thread */
//
// return TRUE;
//}
//
//
//static void receive_messages(private_kernel_interface_t *this)
//{
// while(TRUE)
// {
// netlink_message_t *response;
//
//
// socklen_t addr_length;
// struct sockaddr_nl addr;
// size_t length;
//
// addr_length = sizeof(addr);
// length = recvfrom(netlinkfd, &rsp, sizeof(rsp), 0, (struct sockaddr*)&addr, &addr_length);
// if (r < 0)
// {
// if (errno == EINTR)
// {
// continue;
// }
// return FAILED;
// }
// else if ((size_t) r < sizeof(rsp.n))
// {
// /* not enought bytes for header */
// continue;
// }
// else if (addr.nl_pid != 0)
// {
// /* not interested */
// continue;
// }
// else if (rsp.n.nlmsg_seq != seq)
// {
// DBG(DBG_KLIPS,
// DBG_log("netlink: ignoring out of sequence (%u/%u) message %s"
// , rsp.n.nlmsg_seq, seq
// , sparse_val_show(xfrm_type_names, rsp.n.nlmsg_type)));
// continue;
// }
// break;
// }
//
// if (rsp.n.nlmsg_len > (size_t) r)
// {
// return FALSE;
// }
// else if (rsp.n.nlmsg_type != NLMSG_ERROR
// && (rbuf && rsp.n.nlmsg_type != rbuf->nlmsg_type))
// {
// loglog(RC_LOG_SERIOUS
// , "netlink recvfrom() of response to our %s message"
// " for %s %s was of wrong type (%s)"
// , sparse_val_show(xfrm_type_names, hdr->nlmsg_type)
// , description, text_said
// , sparse_val_show(xfrm_type_names, rsp.n.nlmsg_type));
// return FALSE;
// }
// else if (rbuf)
// {
// if ((size_t) r > rbuf_len)
// {
// loglog(RC_LOG_SERIOUS
// , "netlink recvfrom() of response to our %s message"
// " for %s %s was too long: %ld > %lu"
// , sparse_val_show(xfrm_type_names, hdr->nlmsg_type)
// , description, text_said
// , (long)r, (unsigned long)rbuf_len);
// return FALSE;
// }
// memcpy(rbuf, &rsp, r);
// return TRUE;
// }
// else if (rsp.n.nlmsg_type == NLMSG_ERROR && rsp.e.error)
// {
// loglog(RC_LOG_SERIOUS
// , "ERROR: netlink response for %s %s included errno %d: %s"
// , description, text_said
// , -rsp.e.error
// , strerror(-rsp.e.error));
// return FALSE;
// }
//}
static status_t get_spi(private_kernel_interface_t *this, host_t *src, host_t *dest, protocol_id_t protocol, bool tunnel_mode, u_int32_t *spi)
{
netlink_message_t request, *response;
memset(&request, 0, sizeof(request));
request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.spi)));
request.hdr.nlmsg_flags = NLM_F_REQUEST;
request.hdr.nlmsg_type = XFRM_MSG_ALLOCSPI;
request.spi.info.saddr = src->get_xfrm_addr(src);
request.spi.info.id.daddr = dest->get_xfrm_addr(dest);
request.spi.info.mode = tunnel_mode;
request.spi.info.id.proto = protocol;
request.spi.info.family = PF_INET;
request.spi.min = 100;
request.spi.max = 200;
if (this->send_message(this, &request, &response) != SUCCESS)
{
return FAILED;
}
if (response->hdr.nlmsg_type == NLMSG_ERROR)
{
return FAILED;
}
if (response->hdr.nlmsg_type != XFRM_MSG_NEWSA)
{
return FAILED;
}
else if (response->hdr.nlmsg_len < NLMSG_LENGTH(sizeof(response->sa)))
{
return FAILED;
}
*spi = response->sa.id.spi;
allocator_free(response);
return SUCCESS;
}
static status_t add_sa( private_kernel_interface_t *this,
host_t *me,
host_t *other,
u_int32_t spi,
int protocol,
bool tunnel_mode,
encryption_algorithm_t enc_alg,
size_t enc_size,
chunk_t enc_key,
integrity_algorithm_t int_alg,
size_t int_size,
chunk_t int_key,
bool replace)
{
netlink_message_t request, *response;
memset(&request, 0, sizeof(request));
request.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
request.hdr.nlmsg_type = replace ? XFRM_MSG_UPDSA : XFRM_MSG_NEWSA;
request.sa.saddr = me->get_xfrm_addr(me);
request.sa.id.daddr = other->get_xfrm_addr(other);
request.sa.id.spi = spi;
request.sa.id.proto = protocol;
request.sa.family = me->get_family(me);
request.sa.mode = tunnel_mode;
request.sa.replay_window = 0; //sa->replay_window; ???
request.sa.reqid = 0; //sa->reqid; ???
request.sa.lft.soft_byte_limit = XFRM_INF;
request.sa.lft.soft_packet_limit = XFRM_INF;
request.sa.lft.hard_byte_limit = XFRM_INF;
request.sa.lft.hard_packet_limit = XFRM_INF;
request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.sa)));
if (enc_alg != ENCR_UNDEFINED)
{
netlink_algo_t *nla = (netlink_algo_t*)(((u_int8_t*)&request) + request.hdr.nlmsg_len);
nla->type = XFRMA_ALG_CRYPT;
nla->length = sizeof(netlink_algo_t) + enc_size;
nla->algo.alg_key_len = enc_size * 8;
strcpy(nla->algo.alg_name, mapping_find(kernel_encryption_algs_m, enc_alg));
memcpy(nla->algo.alg_key, enc_key.ptr, enc_key.len);
request.hdr.nlmsg_len += nla->length;
}
if (int_alg != AUTH_UNDEFINED)
{
netlink_algo_t *nla = (netlink_algo_t*)(((u_int8_t*)&request) + request.hdr.nlmsg_len);
nla->type = XFRMA_ALG_AUTH;
nla->length = sizeof(netlink_algo_t) + int_size;
nla->algo.alg_key_len = int_size * 8;
strcpy(nla->algo.alg_name, mapping_find(kernel_integrity_algs_m, int_alg));
memcpy(nla->algo.alg_key, int_key.ptr, int_key.len);
request.hdr.nlmsg_len += nla->length;
}
/* add IPComp */
if (this->send_message(this, &request, &response) != SUCCESS)
{
allocator_free(response);
return FAILED;
}
printf("received message type: %d\n", response->hdr.nlmsg_type);
if (response->hdr.nlmsg_type == NLMSG_ERROR)
{
printf("received error: %s\n", strerror(-response->e.error));
}
allocator_free(response);
return SUCCESS;
}
/**
static status_t send_message(private_kernel_interface_t *this, netlink_message_t *request, netlink_message_t **response)
{
size_t length;
struct sockaddr_nl addr;
request->hdr.nlmsg_seq = ++this->seq;
request->hdr.nlmsg_pid = this->pid;
memset(&addr, 0, sizeof(struct sockaddr_nl));
addr.nl_family = AF_NETLINK;
addr.nl_pid = 0;
addr.nl_groups = 0;
length = sendto(this->socket,(void *)request, request->hdr.nlmsg_len, 0, (struct sockaddr *)&addr, sizeof(addr));
if (length < 0)
{
return FAILED;
}
else if (length != request->hdr.nlmsg_len)
{
return FAILED;
}
pthread_mutex_lock(&(this->mutex));
while (TRUE)
{
iterator_t *iterator;
bool found = FALSE;
/* search list, break if found */
iterator = this->responses->create_iterator(this->responses, TRUE);
while (iterator->has_next(iterator))
{
netlink_message_t *listed_response;
iterator->current(iterator, (void**)&listed_response);
if (listed_response->hdr.nlmsg_seq == request->hdr.nlmsg_seq)
{
/* matches our request, this is the reply */
*response = listed_response;
found = TRUE;
break;
}
}
iterator->destroy(iterator);
if (found)
{
break;
}
/* we should time out, if something goes wrong */
pthread_cond_wait(&(this->condvar), &(this->mutex));
}
pthread_mutex_unlock(&(this->mutex));
return SUCCESS;
}
static void receive_messages(private_kernel_interface_t *this)
{
while(TRUE)
{
netlink_message_t response, *listed_response;
while (TRUE)
{
struct sockaddr_nl addr;
socklen_t addr_length;
size_t length;
addr_length = sizeof(addr);
response.hdr.nlmsg_type = XFRM_MSG_NEWSA;
length = recvfrom(this->socket, &response, sizeof(response), 0, (struct sockaddr*)&addr, &addr_length);
if (length < 0)
{
if (errno == EINTR)
{
/* interrupted, try again */
continue;
}
charon->kill(charon, "receiving from netlink socket failed");
}
if (!NLMSG_OK(&response.hdr, length))
{
/* bad netlink message */
continue;
}
if (addr.nl_pid != 0)
{
/* not interested, try another one */
continue;
}
break;
}
/* got a valid message.
* requests are handled on or own,
* responses are listed for the requesters
*/
if (response.hdr.nlmsg_flags & NLM_F_REQUEST)
{
/* handle request */
}
else
{
/* add response to queue */
listed_response = allocator_alloc(sizeof(response));
memcpy(listed_response, &response, sizeof(response));
pthread_mutex_lock(&(this->mutex));
this->responses->insert_last(this->responses, (void*)listed_response);
pthread_mutex_unlock(&(this->mutex));
/* signal ALL waiting threads */
pthread_cond_broadcast(&(this->condvar));
}
/* get the next one */
}
}
/**
* implements kernel_interface_t.destroy
*/
static void destroy (private_kernel_interface_t *this)
static void destroy(private_kernel_interface_t *this)
{
pthread_cancel(this->thread);
pthread_join(this->thread, NULL);
close(this->socket);
this->responses->destroy(this->responses);
allocator_free(this);
}
@@ -270,10 +415,36 @@ kernel_interface_t *kernel_interface_create()
private_kernel_interface_t *this = allocator_alloc_thing(private_kernel_interface_t);
/* public functions */
this->public.get_spi = (status_t(*)(kernel_interface_t*,host_t*,host_t*,protocol_id_t,bool,u_int32_t*))get_spi;
this->public.add_sa = (status_t(*)(kernel_interface_t *,host_t*,host_t*,u_int32_t,int,bool,encryption_algorithm_t,size_t,chunk_t,integrity_algorithm_t,size_t,chunk_t,bool))add_sa;
this->public.destroy = (void(*)(kernel_interface_t*)) destroy;
/* private members */
this->receive_messages = receive_messages;
this->send_message = send_message;
this->pid = getpid();
this->responses = linked_list_create();
pthread_mutex_init(&(this->mutex),NULL);
pthread_cond_init(&(this->condvar),NULL);
this->seq = 0;
this->socket = socket(PF_NETLINK, SOCK_RAW, NETLINK_XFRM);
if (this->socket <= 0)
{
allocator_free(this);
charon->kill(charon, "Unable to create netlink socket");
}
if (pthread_create(&(this->thread), NULL, (void*(*)(void*))this->receive_messages, this) != 0)
{
close(this->socket);
allocator_free(this);
charon->kill(charon, "Unable to create netlink thread");
}
this->logger = charon->logger_manager->create_logger(charon->logger_manager, TESTER, NULL);
charon->logger_manager->enable_logger_level(charon->logger_manager, TESTER, FULL);
return (&this->public);
}