Version 2 - code style fixes

If no directory entry corresponding to the user-selected device is found at the standard location for non VLAN interfaces (/sys/class/net/${base_device}), 'batctl' now looks into directory: /sys/devices/virtual/net/${base_device}/mesh/vlan${vid} Where: -${base_device}: the batman device on top of which the VLAN is sitting -${device}: the device interface for the VLAN, -${vid}: the identifier assigned to the VLAN.

Information on VLAN devices (base device, vid) necessary to construct the directory path is acquired by parsing /proc/net/vlan/${device}.

If the user-selected command is not supported by the VLAN, an appropriate error is shown. --- functions.c | 3 +++ sys.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 54 insertions(+)

diff --git a/functions.c b/functions.c index cc05a48..ed010ea 100644 --- a/functions.c +++ b/functions.c @@ -135,6 +135,9 @@ static void file_open_problem_dbg(char *dir, char *fname, char *full_path) fprintf(stderr, "Error - the folder '/sys/' was not found on the system\n"); fprintf(stderr, "Please make sure that the sys filesystem is properly mounted\n"); return; + } else if (strstr(dir, "/sys/devices/virtual/")) { + fprintf(stderr, "The selected feature '%s' is not supported for vlans\n", fname); + return; } } diff --git a/sys.c b/sys.c index b1d7ea8..942ead0 100644 --- a/sys.c +++ b/sys.c @@ -371,6 +371,37 @@ static void settings_usage(int setting) fprintf(stderr, " \t -h print this help\n"); } +int get_basedev_vid(char *mesh_iface, char **base_dev, unsigned short *vid) +{ + char *vdev; + char line[100]; + const char path[] = "/proc/net/vlan/"; + int size = sizeof(path) + sizeof(mesh_iface); + FILE *fp = NULL; + + char *fpath = malloc(size); + strcpy(fpath, path); + /* prepare path file path: /proc/net/vlan/$mesh_iface*/ + strcat(fpath, mesh_iface); + + fp = fopen(fpath, "r"); + if (fp == NULL) + return 1; + + if (fscanf(fp, "%ms %*s %hu %*s %*d %*s %*d", &vdev, vid) == 0) + return 0; + + while (fgets(line, sizeof(line), fp) != NULL) { + if (sscanf(line, "Device: %ms", base_dev) == 1) + break; + } + // handle base device not found case + if (*base_dev == NULL) + return 0; + + return 1; +} + int handle_sys_setting(char *mesh_iface, int setting, int argc, char **argv) { int optchar, res = EXIT_FAILURE; @@ -392,6 +423,26 @@ int handle_sys_setting(char *mesh_iface, int setting, int argc, char **argv) snprintf(path_buff, PATH_BUFF_LEN, SYS_BATIF_PATH_FMT, mesh_iface); path_buff[PATH_BUFF_LEN - 1] = '\0'; + if (access(path_buff, F_OK) != 0) { + if (errno == ENOENT) { + // path does not exist, no lan interface: check vlan + unsigned short vid = 0; + char *base_dev = NULL; + if (get_basedev_vid(mesh_iface, &base_dev, &vid) == 1) { + free(path_buff); + char sys_vlan_path[] = "/sys/devices/virtual/net/%s/mesh/vlan%d/"; + int size = sizeof(sys_vlan_path) + sizeof(base_dev); + path_buff = malloc(size); + sprintf(path_buff, sys_vlan_path, base_dev, vid); + } + } + if (errno == ENOTDIR) { + // not a directory, something wrong here + fprintf(stderr, "Error - expected directory at '%s'\n", + path_buff); + return EXIT_FAILURE; + } + } if (argc == 1) { res = read_file(path_buff, (char *)batctl_settings[setting].sysfs_name, NO_FLAGS, 0, 0, 0);