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/**
* @file kernel_interface.c
*
* @brief Implementation of kernel_interface_t.
*
*/
/*
* Copyright (C) 2005 Jan Hutter, Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <linux/netlink.h>
#include <linux/xfrm.h>
#include <pthread.h>
#include "kernel_interface.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;
struct netlink_message_t {
/**
* header of the netlink message
*/
struct nlmsghdr hdr;
union {
struct nlmsgerr e;
struct xfrm_userspi_info spi;
struct xfrm_usersa_info sa;
};
u_int8_t data[];
};
typedef struct private_kernel_interface_t private_kernel_interface_t;
/**
* @brief 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;
/**
* 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;
/**
* sequence number for messages
*/
u_int32_t seq;
/**
* list of replies messages
*/
linked_list_t *replies;
/**
* Function for the thread, receives messages
*/
void (*receive_messages) (private_kernel_interface_t *this);
/**
* 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);
};
//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;
// }
//}
/**
* implements kernel_interface_t.destroy
*/
static void destroy (private_kernel_interface_t *this)
{
allocator_free(this);
}
/*
* Documented in header
*/
kernel_interface_t *kernel_interface_create()
{
private_kernel_interface_t *this = allocator_alloc_thing(private_kernel_interface_t);
/* public functions */
this->public.destroy = (void(*)(kernel_interface_t*)) destroy;
/* private members */
this->socket = socket(PF_NETLINK, SOCK_RAW, NETLINK_XFRM);
return (&this->public);
}
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