bool create_nic(char *nic, char *br, char *pidstr)
{
#if ISTEST
char path[200];
sprintf(path, "/tmp/lxcnettest/%s", nic);
int fd = open(path, O_RDWR|O_CREAT, S_IWUSR | S_IRUSR);
if (fd < 0)
return false;
close(fd);
return true;
#else
// not yet implemented
char *veth1buf, *veth2buf;
veth1buf = alloca(IFNAMSIZ);
veth2buf = alloca(IFNAMSIZ);
int ret;
int pid = atoi(pidstr);
ret = snprintf(veth1buf, IFNAMSIZ, "%s", nic);
if (ret < 0 || ret >= IFNAMSIZ) {
fprintf(stderr, "nic name too long\n");
exit(1);
}
/* create the nics */
if (instanciate_veth(veth1buf, &veth2buf) < 0) {
fprintf(stderr, "Error creating veth tunnel\n");
return false;
}
/* attach veth1 to bridge */
if (lxc_bridge_attach(br, veth1buf) < 0) {
fprintf(stderr, "Error attaching %s to %s\n", veth1buf, br);
goto out_del;
}
/* pass veth2 to target netns */
ret = lxc_netdev_move(veth2buf, pid);
if (ret < 0) {
fprintf(stderr, "Error moving %s to netns %d\n", veth2buf, pid);
goto out_del;
}
return true;
out_del:
lxc_netdev_delete_by_name(veth1buf);
exit(1);
#endif
}
static bool create_nic(char *nic, char *br, int pid, char **cnic)
{
char *veth1buf, *veth2buf;
veth1buf = alloca(IFNAMSIZ);
veth2buf = alloca(IFNAMSIZ);
int ret, mtu;
ret = snprintf(veth1buf, IFNAMSIZ, "%s", nic);
if (ret < 0 || ret >= IFNAMSIZ) {
fprintf(stderr, "host nic name too long\n");
return false;
}
/* create the nics */
if (instanciate_veth(veth1buf, &veth2buf) < 0) {
fprintf(stderr, "Error creating veth tunnel\n");
return false;
}
/* copy the bridge's mtu to both ends */
mtu = get_mtu(br);
if (mtu != -1) {
if (lxc_netdev_set_mtu(veth1buf, mtu) < 0 ||
lxc_netdev_set_mtu(veth2buf, mtu) < 0) {
fprintf(stderr, "Failed setting mtu\n");
goto out_del;
}
}
/* attach veth1 to bridge */
if (lxc_bridge_attach(br, veth1buf) < 0) {
fprintf(stderr, "Error attaching %s to %s\n", veth1buf, br);
goto out_del;
}
/* pass veth2 to target netns */
ret = lxc_netdev_move_by_name(veth2buf, pid, NULL);
if (ret < 0) {
fprintf(stderr, "Error moving %s to netns %d\n", veth2buf, pid);
goto out_del;
}
*cnic = strdup(veth2buf);
return true;
out_del:
lxc_netdev_delete_by_name(veth1buf);
return false;
}
