Allow the batctl tool to take advantage of changes from commit e4ff5c153dab054a6cd1c4132f87bc5e77127456 "add sys framework for VLAN" recently added to batman-adv, so that users can execute commands in a per VLAN fashion.

If no directory entry corresponding to the user-selected device is found at the standard location for non VLAN interfaces (/sys/class/net/${device}/mesh/), 'batctl' now looks into directory: /sys/devices/virtual/net/${base_device}/mesh/vlan${vid} Information on VLAN devices (base device, vid) necessary to construct the directory path is acquired by parsing /proc/net/vlan/${device}. 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.

If the user-selected command is not supported by the VLAN, an appropriate error is shown.

Signed-off-by: Marco Dalla Torre marco.dallato@gmail.com --- Notable changes in V6 -fixed error in string length computation -moved some more variable declarations at the beginning of functions

Notable changes in V5 -fixed use of sizeof instead of strlen to compute length of string -use of getline instead of fgets -avoid using fixed-size buffer in 'get_basedev_vid' -moved constant string declarations, local to functions 'get_basedev_vid' and 'handle_sys_setting', from sys.c to sys.h. Now uses #define like other path declarations. -fixed scanf error condition check -fixed malloc error condition check -moved variable declarations at the beginning of functions

functions.c | 3 ++ main.c | 2 +- man/batctl.8 | 4 +-- sys.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-- sys.h | 3 ++ 5 files changed, 95 insertions(+), 6 deletions(-)

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/main.c b/main.c index 24d42fb..bac37ca 100644 --- a/main.c +++ b/main.c @@ -49,7 +49,7 @@ void print_usage(void)

fprintf(stderr, "Usage: batctl [options] command|debug table [parameters]\n"); fprintf(stderr, "options:\n"); - fprintf(stderr, " \t-m mesh interface (default 'bat0')\n"); + fprintf(stderr, " \t-m mesh interface or mesh-based VLAN interface (default 'bat0')\n"); fprintf(stderr, " \t-h print this help (or 'batctl <command|debug table> -h' for the parameter help)\n"); fprintf(stderr, " \t-v print version\n"); fprintf(stderr, "\n"); diff --git a/man/batctl.8 b/man/batctl.8 index d04385b..b45cccf 100644 --- a/man/batctl.8 +++ b/man/batctl.8 @@ -42,7 +42,7 @@ behaviour or using the B.A.T.M.A.N. advanced protocol. .SH OPTIONS .TP .I \fBoptions: --m specify mesh interface (default 'bat0') +-m specify mesh interface or a mesh-based VLAN interface (default 'bat0') .br -h print general batctl help .br @@ -61,7 +61,7 @@ originator interval. The interval is in units of milliseconds. .br .IP "\fBap_isolation\fP|\fBap\fP [\fB0\fP|\fB1\fP]" If no parameter is given the current ap isolation setting is displayed. Otherwise the parameter is used to enable or -disable ap isolation. +disable ap isolation. This command can be used in conjunction with "-m" option to target per VLAN configurations. .br .IP "\fBbridge_loop_avoidance\fP|\fBbl\fP [\fB0\fP|\fB1\fP]" If no parameter is given the current bridge loop avoidance setting is displayed. Otherwise the parameter is used to enable diff --git a/sys.c b/sys.c index b1d7ea8..6f23fb2 100644 --- a/sys.c +++ b/sys.c @@ -371,11 +371,64 @@ static void settings_usage(int setting) fprintf(stderr, " \t -h print this help\n"); }

+/** + * get_basedev_vid - given a valid VLAN interface, identifies the batman device + * on top of which the VLAN is sitting and its VLAN ID + * @mesh_iface: name of the VLAN network interface + * @base_dev: output argument, pointer to the base device name + * @vid: output argument, pointer to the VLAN ID number + * + * Returns 0 if execution is successful, -1 if an error occurred + */ +static int get_basedev_vid(const char *mesh_iface, char **base_dev, unsigned short *vid) +{ + char *vdev; + char *line_ptr; + size_t len; + FILE *fp; + char *fpath; + + int size = strlen(PROC_VLAN_PATH) + strlen(mesh_iface) + 1; + fpath = malloc(size); + if (!fpath) { + fprintf(stderr, "Error - could not allocate path buffer: out of memory ?\n"); + return EXIT_FAILURE; + } + /* prepare path file path: /proc/net/vlan/$mesh_iface*/ + snprintf(fpath, size, "%s%s", PROC_VLAN_PATH, mesh_iface); + + fp = fopen(fpath, "r"); + if (!fp) { + fprintf(stderr, "Error - could not open file '%s': %s\n", + fpath, strerror(errno)); + return EXIT_FAILURE; + } + + if (fscanf(fp, "%ms %*s %hu %*s %*d %*s %*d", &vdev, vid) != 2) + return EXIT_FAILURE; + + *base_dev = NULL; + while (getline(&line_ptr, &len, fp) != -1) { + if (sscanf(line_ptr, "Device: %ms", base_dev) == 1) + break; + } + fclose(fp); + free(line_ptr); + /* handle base device not found case */ + if (*base_dev == NULL) + return EXIT_FAILURE; + + return EXIT_SUCCESS; +} + int handle_sys_setting(char *mesh_iface, int setting, int argc, char **argv) { int optchar, res = EXIT_FAILURE; char *path_buff; const char **ptr; + unsigned short vid; + char *base_dev; + ssize_t path_length;

while ((optchar = getopt(argc, argv, "h")) != -1) { switch (optchar) { @@ -388,10 +441,40 @@ int handle_sys_setting(char *mesh_iface, int setting, int argc, char **argv) } }

- path_buff = malloc(PATH_BUFF_LEN); - snprintf(path_buff, PATH_BUFF_LEN, SYS_BATIF_PATH_FMT, mesh_iface); - path_buff[PATH_BUFF_LEN - 1] = '\0'; + path_length = strlen(SYS_BATIF_PATH_FMT) + strlen(mesh_iface) + 1; + path_buff = malloc(path_length); + if (!path_buff) { + fprintf(stderr, "Error - could not allocate path buffer: out of memory ?\n"); + return EXIT_FAILURE; + } + snprintf(path_buff, path_length, SYS_BATIF_PATH_FMT, mesh_iface);

+ if (access(path_buff, F_OK) != 0) { + if (errno == ENOENT) { + /* path does not exist, no lan interface: check vlan */ + if (get_basedev_vid(mesh_iface, &base_dev, &vid) == EXIT_SUCCESS) { + /* free for previous allocation */ + free(path_buff); + path_length = strlen(SYS_VLAN_PATH) + + strlen(base_dev) + + VLAN_ID_MAX_LEN + 1; + path_buff = malloc(path_length); + if (!path_buff) { + fprintf(stderr, "Error - could not allocate path buffer: out of memory ?\n"); + return EXIT_FAILURE; + } + snprintf(path_buff, path_length, SYS_VLAN_PATH, + base_dev, vid); + } else { + return EXIT_FAILURE; + } + } else 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); diff --git a/sys.h b/sys.h index a588e0b..f5df845 100644 --- a/sys.h +++ b/sys.h @@ -30,6 +30,9 @@ #define SYS_IFACE_DIR SYS_IFACE_PATH"/%s/" #define SYS_MESH_IFACE_FMT SYS_IFACE_PATH"/%s/batman_adv/mesh_iface" #define SYS_IFACE_STATUS_FMT SYS_IFACE_PATH"/%s/batman_adv/iface_status" +#define PROC_VLAN_PATH "/proc/net/vlan/" +#define SYS_VLAN_PATH "/sys/devices/virtual/net/%s/mesh/vlan%d/" +#define VLAN_ID_MAX_LEN 4

enum batctl_settings_list { BATCTL_SETTINGS_ORIG_INTERVAL,