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batman-adv: netlink: hardif query

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BATADV_CMD_GET_HARDIFS will return the list of hardifs (including index,
name and MAC address) of all hardifs for a given softif.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
[sven.eckelmann@open-mesh.com: Reduce the number of changes to
BATADV_CMD_GET_HARDIFS, add policy for attributes]
Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
This commit is contained in:
Matthias Schiffer
2016-07-03 13:31:36 +02:00
committed by Simon Wunderlich
parent 07a3061e08
commit b60620cf56
2 changed files with 130 additions and 2 deletions
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128
net/batman-adv/netlink.c
View File

@@ -26,10 +26,14 @@
#include <linux/netdevice.h>
#include <linux/netlink.h>
#include <linux/printk.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/skbuff.h>
#include <linux/stddef.h>
#include <linux/types.h>
#include <net/genetlink.h>
#include <net/netlink.h>
#include <net/sock.h>
#include <uapi/linux/batman_adv.h>
#include "bat_algo.h"
@@ -37,8 +41,6 @@
#include "soft-interface.h"
#include "tp_meter.h"
struct sk_buff;
struct genl_family batadv_netlink_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
@@ -70,8 +72,24 @@ static struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
[BATADV_ATTR_TPMETER_TEST_TIME] = { .type = NLA_U32 },
[BATADV_ATTR_TPMETER_BYTES] = { .type = NLA_U64 },
[BATADV_ATTR_TPMETER_COOKIE] = { .type = NLA_U32 },
[BATADV_ATTR_ACTIVE] = { .type = NLA_FLAG },
};
/**
* batadv_netlink_get_ifindex - Extract an interface index from a message
* @nlh: Message header
* @attrtype: Attribute which holds an interface index
*
* Return: interface index, or 0.
*/
static int
batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype)
{
struct nlattr *attr = nlmsg_find_attr(nlh, GENL_HDRLEN, attrtype);
return attr ? nla_get_u32(attr) : 0;
}
/**
* batadv_netlink_mesh_info_put - fill in generic information about mesh
* interface
@@ -381,6 +399,106 @@ out:
return ret;
}
/**
* batadv_netlink_dump_hardif_entry - Dump one hard interface into a message
* @msg: Netlink message to dump into
* @portid: Port making netlink request
* @seq: Sequence number of netlink message
* @hard_iface: Hard interface to dump
*
* Return: error code, or 0 on success
*/
static int
batadv_netlink_dump_hardif_entry(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_hard_iface *hard_iface)
{
struct net_device *net_dev = hard_iface->net_dev;
void *hdr;
hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, NLM_F_MULTI,
BATADV_CMD_GET_HARDIFS);
if (!hdr)
return -EMSGSIZE;
if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
net_dev->ifindex) ||
nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
net_dev->name) ||
nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
net_dev->dev_addr))
goto nla_put_failure;
if (hard_iface->if_status == BATADV_IF_ACTIVE) {
if (nla_put_flag(msg, BATADV_ATTR_ACTIVE))
goto nla_put_failure;
}
genlmsg_end(msg, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
/**
* batadv_netlink_dump_hardifs - Dump all hard interface into a messages
* @msg: Netlink message to dump into
* @cb: Parameters from query
*
* Return: error code, or length of reply message on success
*/
static int
batadv_netlink_dump_hardifs(struct sk_buff *msg, struct netlink_callback *cb)
{
struct net *net = sock_net(cb->skb->sk);
struct net_device *soft_iface;
struct batadv_hard_iface *hard_iface;
int ifindex;
int portid = NETLINK_CB(cb->skb).portid;
int seq = cb->nlh->nlmsg_seq;
int skip = cb->args[0];
int i = 0;
ifindex = batadv_netlink_get_ifindex(cb->nlh,
BATADV_ATTR_MESH_IFINDEX);
if (!ifindex)
return -EINVAL;
soft_iface = dev_get_by_index(net, ifindex);
if (!soft_iface)
return -ENODEV;
if (!batadv_softif_is_valid(soft_iface)) {
dev_put(soft_iface);
return -ENODEV;
}
rcu_read_lock();
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
if (hard_iface->soft_iface != soft_iface)
continue;
if (i++ < skip)
continue;
if (batadv_netlink_dump_hardif_entry(msg, portid, seq,
hard_iface)) {
i--;
break;
}
}
rcu_read_unlock();
dev_put(soft_iface);
cb->args[0] = i;
return msg->len;
}
static struct genl_ops batadv_netlink_ops[] = {
{
.cmd = BATADV_CMD_GET_MESH_INFO,
@@ -406,6 +524,12 @@ static struct genl_ops batadv_netlink_ops[] = {
.policy = batadv_netlink_policy,
.dumpit = batadv_algo_dump,
},
{
.cmd = BATADV_CMD_GET_HARDIFS,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.dumpit = batadv_netlink_dump_hardifs,
},
};
/**