- kernel interface hacks, works partially

- interface must be redefined

1 files changed, 340 insertions, 169 deletions

diff --git a/Source/charon/threads/kernel_interface.c b/Source/charon/threads/kernel_interface.c
index ffc839038..b951545ab 100644
--- a/Source/charon/threads/kernel_interface.c
+++ b/Source/charon/threads/kernel_interface.c
@@ -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;
+ 	int bc_socket;
+
+	pid_t pid;
+ 	/**
+ 	 * sequence number for messages
+ 	 */
+ 	u_int32_t seq;
+ 	
+ 	/** 
+ 	 * list of responded messages
+ 	 */
+ 	linked_list_t *responses;
  	
  	/**
- 	 * since we use multiple threads, we can't call
- 	 * getpid multiple times. The pid is set once.
+ 	 * thread which receives messages
  	 */
- 	pid_t pid;
+ 	pthread_t thread;
  	
  	/**
- 	 * sequence number for messages
+ 	 * mutex locks access to replies list 
  	 */
- 	u_int32_t seq;
+ 	pthread_mutex_t mutex;
  	
- 	/** 
- 	 * list of replies messages
+ 	/**
+ 	 * Condvar allows signaling of threads waiting for a reply
  	 */
- 	linked_list_t *replies;
+ 	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);
 }