* [B.A.T.M.A.N.] [PATCHv2 next 2/3] batctl: implement vlan-to-link helper functions
2014-01-05 21:37 [B.A.T.M.A.N.] [PATCHv2 next 1/3] batctl: introduce rtnl_open() helper function Antonio Quartulli
@ 2014-01-05 21:37 ` Antonio Quartulli
2014-01-05 21:37 ` [B.A.T.M.A.N.] [PATCHv2 next 3/3] batctl: add sys framework for VLAN support Antonio Quartulli
1 sibling, 0 replies; 3+ messages in thread
From: Antonio Quartulli @ 2014-01-05 21:37 UTC (permalink / raw)
To: b.a.t.m.a.n; +Cc: Antonio Quartulli
This functions can be used to convert a vlan interface
into the real one and to extract the vlan identifier.
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
---
functions.c | 165 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
functions.h | 1 +
2 files changed, 166 insertions(+)
diff --git a/functions.c b/functions.c
index 50bb834..fdae6fa 100644
--- a/functions.c
+++ b/functions.c
@@ -40,6 +40,7 @@
#include <linux/neighbour.h>
#include <sys/uio.h>
#include <errno.h>
+#include <net/if.h>
#include "main.h"
#include "functions.h"
@@ -764,3 +765,167 @@ struct ether_addr *resolve_mac(const char *asc)
out:
return mac_result;
}
+
+/**
+ * vlan_get_link_parse - parse a get_link rtnl message and extract the important
+ * data
+ * @nh: the reply header
+ * @iface: pointer to the buffer where the link interface has to be stored (it
+ * is allocated by this function)
+ *
+ * Return the vid in case of success or -1 otherwise
+ */
+static int vlan_get_link_parse(struct nlmsghdr *nh, char **iface)
+{
+ struct ifinfomsg *ifi = NLMSG_DATA(nh);
+ size_t vlan_len, info_len, len = nh->nlmsg_len;
+ struct rtattr *rta, *info, *vlan;
+ int idx = -1, vid = -1;
+
+ *iface = NULL;
+
+ rta = IFLA_RTA(ifi);
+ while (RTA_OK(rta, len)) {
+ /* check if the interface is a vlan */
+ if (rta->rta_type == IFLA_LINKINFO) {
+ info = RTA_DATA(rta);
+ info_len = RTA_PAYLOAD(rta);
+
+ while (RTA_OK(info, info_len)) {
+ if (info->rta_type == IFLA_INFO_KIND &&
+ strcmp(RTA_DATA(info), "vlan"))
+ goto err;
+
+ if (info->rta_type == IFLA_INFO_DATA) {
+ vlan = RTA_DATA(info);
+ vlan_len = RTA_PAYLOAD(info);
+
+ while (RTA_OK(vlan, vlan_len)) {
+ if (vlan->rta_type == IFLA_VLAN_ID)
+ vid = *(int *)RTA_DATA(vlan);
+ vlan = RTA_NEXT(vlan, vlan_len);
+ }
+ }
+ info = RTA_NEXT(info, info_len);
+ }
+ }
+
+ /* extract the name of the "link" interface */
+ if (rta->rta_type == IFLA_LINK) {
+ idx = *(int *)RTA_DATA(rta);
+
+ *iface = malloc(IFNAMSIZ + 1);
+ if (!if_indextoname(idx, *iface))
+ goto err;
+ }
+ rta = RTA_NEXT(rta, len);
+ }
+
+ if (vid == -1)
+ goto err;
+
+ if (idx <= 0)
+ goto err;
+
+ return vid;
+err:
+ free(*iface);
+ return -1;
+}
+
+/**
+ * vlan_get_link_dump - receive and dump a get_link rtnl reply
+ * @sock: the socket to listen for the reply on
+ * @buf: buffer where the reply has to be dumped to
+ * @buflen: length of the buffer
+ *
+ * Returns the amount of dumped bytes
+ */
+static ssize_t vlan_get_link_dump(int sock, void *buf, size_t buflen)
+{
+ struct sockaddr_nl nladdr;
+ struct msghdr msg;
+ struct iovec iov;
+
+ memset(&msg, 0, sizeof(msg));
+ memset(&iov, 0, sizeof(iov));
+
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_controllen = 0;
+ msg.msg_control = NULL;
+ msg.msg_flags = 0;
+ msg.msg_name = &nladdr;
+ msg.msg_namelen = sizeof(nladdr);
+
+ iov.iov_len = buflen;
+ iov.iov_base = buf;
+
+ return recvmsg(sock, &msg, 0);
+}
+
+/**
+ * vlan_get_link_open - send a get_link request
+ * @ifname: the interface to query
+ *
+ * Returns 0 in case of success or a negative error code otherwise
+ */
+static int vlan_get_link_open(const char *ifname)
+{
+ struct {
+ struct nlmsghdr hdr;
+ struct ifinfomsg ifi;
+ /* attribute has to be NLMSG aligned */
+ struct rtattr rta_ifname __attribute__ ((aligned(NLMSG_ALIGNTO)));
+ char ifname[IFNAMSIZ + 1];
+ } nlreq;
+
+ memset(&nlreq, 0, sizeof(nlreq));
+ nlreq.hdr.nlmsg_len = sizeof(nlreq);
+ nlreq.hdr.nlmsg_type = RTM_GETLINK;
+ nlreq.hdr.nlmsg_flags = NLM_F_REQUEST;
+ nlreq.ifi.ifi_family = AF_UNSPEC;
+
+ nlreq.rta_ifname.rta_type = IFLA_IFNAME;
+ nlreq.rta_ifname.rta_len = IFNAMSIZ + 1;
+ strncpy(nlreq.ifname, ifname, IFNAMSIZ);
+
+ return rtnl_open(&nlreq.hdr, 0);
+}
+
+/**
+ * vlan_get_link - convert a VLAN interface into its parent one
+ * @ifname: the interface to convert
+ * @parent: buffer where the parent interface name will be written (allocated by
+ * this function)
+ *
+ * Returns the vlan identifier on success or -1 on error
+ */
+int vlan_get_link(const char *ifname, char **parent)
+{
+ int vid = -1, socknl;
+ void *buf = NULL;
+ size_t buflen;
+ ssize_t len;
+
+ buflen = 8192;
+ buf = malloc(buflen);
+ if (!buf)
+ goto err;
+
+ socknl = vlan_get_link_open(ifname);
+ if (socknl < 0)
+ goto err;
+
+ len = vlan_get_link_dump(socknl, buf, buflen);
+ if (len < 0)
+ goto err_sock;
+
+ vid = vlan_get_link_parse(buf, parent);
+
+err_sock:
+ close(socknl);
+err:
+ free(buf);
+ return vid;
+}
diff --git a/functions.h b/functions.h
index 522c607..14ba525 100644
--- a/functions.h
+++ b/functions.h
@@ -42,6 +42,7 @@ int write_file(const char *dir, const char *fname, const char *arg1,
const char *arg2);
struct ether_addr *translate_mac(char *mesh_iface, struct ether_addr *mac);
struct ether_addr *resolve_mac(const char *asc);
+int vlan_get_link(const char *ifname, char **parent);
extern char *line_ptr;
--
1.8.5.2
^ permalink raw reply related [flat|nested] 3+ messages in thread* [B.A.T.M.A.N.] [PATCHv2 next 3/3] batctl: add sys framework for VLAN support
2014-01-05 21:37 [B.A.T.M.A.N.] [PATCHv2 next 1/3] batctl: introduce rtnl_open() helper function Antonio Quartulli
2014-01-05 21:37 ` [B.A.T.M.A.N.] [PATCHv2 next 2/3] batctl: implement vlan-to-link helper functions Antonio Quartulli
@ 2014-01-05 21:37 ` Antonio Quartulli
1 sibling, 0 replies; 3+ messages in thread
From: Antonio Quartulli @ 2014-01-05 21:37 UTC (permalink / raw)
To: b.a.t.m.a.n; +Cc: Marco Dalla Torre, Antonio Quartulli
From: Marco Dalla Torre <marco.dallato@gmail.com>
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/${device}/mesh/), 'batctl' now looks into directory:
/sys/class/net/${base_device}/mesh/vlan${vid}
Information on VLAN devices (base device, vid) necessary to construct the
directory path is acquired by querying the netlink kernel module.
Where:
-${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>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
---
main.c | 2 +-
man/batctl.8 | 4 ++--
sys.c | 15 +++++++++++++--
sys.h | 22 ++++++++++++----------
4 files changed, 28 insertions(+), 15 deletions(-)
diff --git a/main.c b/main.c
index aab2e11..a37c0b7 100644
--- a/main.c
+++ b/main.c
@@ -46,7 +46,7 @@ static 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 VLAN created on top of a mesh 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 fafe735..b3b12bd 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 VLAN created on top of a mesh 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 2a508e2..5cebf52 100644
--- a/sys.c
+++ b/sys.c
@@ -372,8 +372,8 @@ static void settings_usage(int setting)
int handle_sys_setting(char *mesh_iface, int setting, int argc, char **argv)
{
- int optchar, res = EXIT_FAILURE;
- char *path_buff;
+ int vid, optchar, res = EXIT_FAILURE;
+ char *path_buff, *base_dev = NULL;
const char **ptr;
while ((optchar = getopt(argc, argv, "h")) != -1) {
@@ -387,10 +387,20 @@ int handle_sys_setting(char *mesh_iface, int setting, int argc, char **argv)
}
}
+ /* prepare the classic path */
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';
+ /* if the specified interface is a VLAN then change the path to point
+ * to the proper "vlan%{vid}" subfolder in the sysfs tree.
+ */
+ vid = vlan_get_link(mesh_iface, &base_dev);
+ if (vid >= 0) {
+ snprintf(path_buff, PATH_BUFF_LEN, SYS_VLAN_PATH, base_dev, vid);
+ path_buff[PATH_BUFF_LEN - 1] = '\0';
+ }
+
if (argc == 1) {
res = read_file(path_buff, (char *)batctl_settings[setting].sysfs_name,
NO_FLAGS, 0, 0, 0);
@@ -425,6 +435,7 @@ write_file:
out:
free(path_buff);
+ free(base_dev);
return res;
}
diff --git a/sys.h b/sys.h
index 8934978..2cbbcfb 100644
--- a/sys.h
+++ b/sys.h
@@ -24,16 +24,18 @@
#include "main.h"
-#define SYS_BATIF_PATH_FMT "/sys/class/net/%s/mesh/"
-#define SYS_LOG_LEVEL "log_level"
-#define SYS_LOG "log"
-#define SYS_GW_MODE "gw_mode"
-#define SYS_GW_SEL "gw_sel_class"
-#define SYS_GW_BW "gw_bandwidth"
-#define SYS_IFACE_PATH "/sys/class/net"
-#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 SYS_BATIF_PATH_FMT "/sys/class/net/%s/mesh/"
+#define SYS_LOG_LEVEL "log_level"
+#define SYS_LOG "log"
+#define SYS_GW_MODE "gw_mode"
+#define SYS_GW_SEL "gw_sel_class"
+#define SYS_GW_BW "gw_bandwidth"
+#define SYS_IFACE_PATH "/sys/class/net"
+#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 SYS_VLAN_PATH SYS_IFACE_PATH"/%s/mesh/vlan%d/"
+#define VLAN_ID_MAX_LEN 4
enum batctl_settings_list {
BATCTL_SETTINGS_ORIG_INTERVAL,
--
1.8.5.2
^ permalink raw reply related [flat|nested] 3+ messages in thread