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rtnetlink_tunnel.c

50

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <libmnl/libmnl.h>

#include <linux/rtnetlink.h>

#include <netinet/in.h>

#include <linux/if.h>

#include <linux/ip.h>

#include <linux/if_link.h>

#include <linux/if_tunnel.h>

#include <arpa/inet.h>

int main ( int argc , char * argv []){

struct mnl_socket * nl_sock = NULL ;

struct nlmsghdr * nlh = NULL ;

struct nlmsgerr * nlerr = NULL ;

struct nlattr * linkinfo = NULL , * tunnelinfo = NULL ;

struct ifinfomsg * ifinfo = NULL ;

uint8_t buf [ MNL_SOCKET_BUFFER_SIZE ];

size_t numbytes = 0 ;

struct in_addr addr ;

memset ( buf , 0 , sizeof ( buf ));

if (( nl_sock = mnl_socket_open ( NETLINK_ROUTE )) == NULL ){

perror ( "mnl_socket_open: " );

exit ( EXIT_FAILURE );

}

//Add and configure header

nlh = mnl_nlmsg_put_header ( buf );

//Create only if interface does not exists from before (EXCL)

nlh -> nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL | NLM_F_ACK ;

nlh -> nlmsg_type = RTM_NEWLINK ;

//see rtnl_newlink in net/core/rtnetlink.c for observing how this function

//works

ifinfo = mnl_nlmsg_put_extra_header ( nlh , sizeof ( struct ifinfomsg ));

ifinfo -> ifi_family = AF_UNSPEC ;

//Add a name and mtu, for testing

mnl_attr_put_str ( nlh , IFLA_IFNAME , "kre2" );

mnl_attr_put_u32 ( nlh , IFLA_MTU , 1234 );

//Type is required, set to IPIP

linkinfo = mnl_attr_nest_start ( nlh , IFLA_LINKINFO );

mnl_attr_put_str ( nlh , IFLA_INFO_KIND , "ipip" );

//Add information about the tunnel

tunnelinfo = mnl_attr_nest_start ( nlh , IFLA_INFO_DATA );

inet_pton ( AF_INET , "192.168.203.19" , & addr );

mnl_attr_put_u32 ( nlh , IFLA_IPTUN_LOCAL , addr . s_addr );

inet_pton ( AF_INET , "10.0.0.2" , & addr );

mnl_attr_put_u32 ( nlh , IFLA_IPTUN_REMOTE , addr . s_addr );

mnl_attr_nest_end ( nlh , tunnelinfo );

mnl_attr_nest_end ( nlh , linkinfo );

numbytes = mnl_socket_sendto ( nl_sock , nlh , nlh -> nlmsg_len );

numbytes = mnl_socket_recvfrom ( nl_sock , buf , sizeof ( buf ));

nlh = ( struct nlmsghdr * ) buf ;

if ( nlh -> nlmsg_type == NLMSG_ERROR ){

nlerr = mnl_nlmsg_get_payload ( nlh );

//error==0 for ack

if ( nlerr -> error )

printf ( "Error: %s\n" , strerror ( - nlerr -> error ));

} else {

printf ( "Link added\n" );

}

return EXIT_FAILURE ;

}

rtnetlink_tunnel.c

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