Cedric Roux
56c66c09aa
Pre-ci test passed git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4000 818b1a75-f10b-46b9-bf7c-635c3b92a50f
87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
/*! \file netlink_init.c
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* \brief initiate the netlink socket for communication with nas dirver
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* \author Navid Nikaein and Raymomd Knopp
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* \date 2011
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* \version 1.0
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* \company Eurecom
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* \email: navid.nikaein@eurecom.fr
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*/
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#include <sys/socket.h>
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#include <linux/netlink.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#define MAX_PAYLOAD 4096 /* this sould cover the max mtu size*/
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struct sockaddr_nl nas_src_addr, nas_dest_addr;
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struct nlmsghdr *nas_nlh = NULL;
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struct iovec nas_iov;
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int nas_sock_fd;
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struct msghdr nas_msg;
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#define GRAAL_NETLINK_ID 31
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int netlink_init(void) {
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int ret;
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nas_sock_fd = socket(PF_NETLINK, SOCK_RAW,GRAAL_NETLINK_ID);
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if (nas_sock_fd==-1) {
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printf("[NETLINK] Error opening socket %d\n",nas_sock_fd);
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return(-1);
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}
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printf("[NETLINK]Opened socket with fd %d\n",nas_sock_fd);
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ret = fcntl(nas_sock_fd,F_SETFL,O_NONBLOCK);
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printf("[NETLINK] fcntl returns %d\n",ret);
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memset(&nas_src_addr, 0, sizeof(nas_src_addr));
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nas_src_addr.nl_family = AF_NETLINK;
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nas_src_addr.nl_pid = 1;//getpid(); /* self pid */
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nas_src_addr.nl_groups = 0; /* not in mcast groups */
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ret = bind(nas_sock_fd, (struct sockaddr*)&nas_src_addr,
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sizeof(nas_src_addr));
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printf("[NETLINK] bind returns %d\n",ret);
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memset(&nas_dest_addr, 0, sizeof(nas_dest_addr));
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nas_dest_addr.nl_family = AF_NETLINK;
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nas_dest_addr.nl_pid = 0; /* For Linux Kernel */
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nas_dest_addr.nl_groups = 0; /* unicast */
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nas_nlh=(struct nlmsghdr *)malloc(NLMSG_SPACE(MAX_PAYLOAD));
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/* Fill the netlink message header */
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nas_nlh->nlmsg_len = NLMSG_SPACE(MAX_PAYLOAD);
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nas_nlh->nlmsg_pid = 1;//getpid(); /* self pid */
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nas_nlh->nlmsg_flags = 0;
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nas_iov.iov_base = (void *)nas_nlh;
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nas_iov.iov_len = nas_nlh->nlmsg_len;
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memset(&nas_msg,0,sizeof(nas_msg));
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nas_msg.msg_name = (void *)&nas_dest_addr;
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nas_msg.msg_namelen = sizeof(nas_dest_addr);
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nas_msg.msg_iov = &nas_iov;
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nas_msg.msg_iovlen = 1;
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/* Read message from kernel */
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memset(nas_nlh, 0, NLMSG_SPACE(MAX_PAYLOAD));
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return(nas_sock_fd);
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}
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