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Use TUN device for NAS for the UE instead of ue_ip.ko

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This work is based on work by NTT.

To use the code, do:
./build_oai --oaisim --ue-nas-use-tun -t ETHERNET -c

This commit only handles oaisim in S1 mode.

We won't handle noS1 mode.
This commit is contained in:
Cedric Roux
2018-04-06 16:53:42 +02:00
parent 1272cabb35
commit cf45997110
4 changed files with 192 additions and 0 deletions
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openair1/SIMULATION/ETH_TRANSPORT/netlink_init.c
+118
View File
@@ -39,6 +39,13 @@
#include <fcntl.h>
#include <errno.h>
#include "platform_constants.h"
#ifdef UE_NAS_USE_TUN
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#include "openairinterface5g_limits.h"
#endif
char nl_rx_buf[NL_MAX_PAYLOAD];
@@ -47,12 +54,121 @@ struct nlmsghdr *nas_nlh_tx = NULL;
struct nlmsghdr *nas_nlh_rx = NULL;
struct iovec nas_iov_tx;
struct iovec nas_iov_rx = {nl_rx_buf, sizeof(nl_rx_buf)};
#ifdef UE_NAS_USE_TUN
int nas_sock_fd[NUMBER_OF_UE_MAX];
#else
int nas_sock_fd;
#endif
struct msghdr nas_msg_tx;
struct msghdr nas_msg_rx;
#define GRAAL_NETLINK_ID 31
#ifdef UE_NAS_USE_TUN
static int tun_alloc(char *dev)
{
struct ifreq ifr;
int fd, err;
if( (fd = open("/dev/net/tun", O_RDWR)) < 0 ) {
printf("[TUN] failed to open /dev/net/tun\n");
return -1;
}
memset(&ifr, 0, sizeof(ifr));
/* Flags: IFF_TUN - TUN device (no Ethernet headers)
* IFF_TAP - TAP device
*
* IFF_NO_PI - Do not provide packet information
*/
ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
if( *dev )
strncpy(ifr.ifr_name, dev, IFNAMSIZ);
if( (err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0 ){
close(fd);
return err;
}
strcpy(dev, ifr.ifr_name);
return fd;
}
int netlink_init(void)
{
int i;
int ret;
char ifname[64];
for (i = 0; i < NUMBER_OF_UE_MAX; i++) {
sprintf(ifname, "oip%d", i+1);
nas_sock_fd[i] = tun_alloc(ifname);
if (nas_sock_fd[i] == -1) {
printf("[NETLINK] Error opening socket %d (%d:%s)\n",nas_sock_fd[i],errno, strerror(errno));
#if defined(LINK_ENB_PDCP_TO_IP_DRIVER)
exit(1);
#endif
}
printf("[NETLINK]Opened socket with fd %d\n",nas_sock_fd[i]);
#if !defined(PDCP_USE_NETLINK_QUEUES)
ret = fcntl(nas_sock_fd[i],F_SETFL,O_NONBLOCK);
if (ret == -1) {
printf("[NETLINK] Error fcntl (%d:%s)\n",errno, strerror(errno));
#if defined(LINK_ENB_PDCP_TO_IP_DRIVER)
exit(1);
#endif
}
#endif
memset(&nas_src_addr, 0, sizeof(nas_src_addr));
nas_src_addr.nl_family = AF_NETLINK;
nas_src_addr.nl_pid = 1;//getpid(); /* self pid */
nas_src_addr.nl_groups = 0; /* not in mcast groups */
ret = bind(nas_sock_fd[i], (struct sockaddr*)&nas_src_addr, sizeof(nas_src_addr));
memset(&nas_dest_addr, 0, sizeof(nas_dest_addr));
nas_dest_addr.nl_family = AF_NETLINK;
nas_dest_addr.nl_pid = 0; /* For Linux Kernel */
nas_dest_addr.nl_groups = 0; /* unicast */
// TX PART
nas_nlh_tx=(struct nlmsghdr *)malloc(NLMSG_SPACE(NL_MAX_PAYLOAD));
memset(nas_nlh_tx, 0, NLMSG_SPACE(NL_MAX_PAYLOAD));
/* Fill the netlink message header */
nas_nlh_tx->nlmsg_len = NLMSG_SPACE(NL_MAX_PAYLOAD);
nas_nlh_tx->nlmsg_pid = 1;//getpid(); /* self pid */
nas_nlh_tx->nlmsg_flags = 0;
nas_iov_tx.iov_base = (void *)nas_nlh_tx;
nas_iov_tx.iov_len = nas_nlh_tx->nlmsg_len;
memset(&nas_msg_tx,0,sizeof(nas_msg_tx));
nas_msg_tx.msg_name = (void *)&nas_dest_addr;
nas_msg_tx.msg_namelen = sizeof(nas_dest_addr);
nas_msg_tx.msg_iov = &nas_iov_tx;
nas_msg_tx.msg_iovlen = 1;
// RX PART
memset(&nas_msg_rx,0,sizeof(nas_msg_rx));
nas_msg_rx.msg_name = (void *)&nas_src_addr;
nas_msg_rx.msg_namelen = sizeof(nas_src_addr);
nas_msg_rx.msg_iov = &nas_iov_rx;
nas_msg_rx.msg_iovlen = 1;
}
return 1;
}
#else /* UE_NAS_USE_TUN */
int netlink_init(void)
{
int ret;
@@ -119,3 +235,5 @@ int netlink_init(void)
return(nas_sock_fd);
}
#endif /* UE_NAS_USE_TUN */