Commit 79fe1a2a authored by Alexander Aring's avatar Alexander Aring Committed by Marcel Holtmann
Browse files

ieee802154: add nl802154 framework



This patch adds a basic nl802154 framework. Most of this code was
grabbed from nl80211 framework.
Signed-off-by: default avatarAlexander Aring <alex.aring@gmail.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 3ae75e02
......@@ -3,7 +3,7 @@ obj-$(CONFIG_IEEE802154_6LOWPAN) += ieee802154_6lowpan.o
ieee802154_6lowpan-y := 6lowpan_rtnl.o reassembly.o
ieee802154-y := netlink.o nl-mac.o nl-phy.o nl_policy.o core.o \
header_ops.o sysfs.o
header_ops.o sysfs.o nl802154.o
af_802154-y := af_ieee802154.o raw.o dgram.o
ccflags-y += -D__CHECK_ENDIAN__
......@@ -21,11 +21,12 @@
#include <net/rtnetlink.h>
#include "ieee802154.h"
#include "nl802154.h"
#include "sysfs.h"
#include "core.h"
/* RCU-protected (and RTNL for writers) */
static LIST_HEAD(cfg802154_rdev_list);
LIST_HEAD(cfg802154_rdev_list);
static int cfg802154_rdev_list_generation;
static int wpan_phy_match(struct device *dev, const void *data)
......@@ -74,6 +75,23 @@ int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data),
}
EXPORT_SYMBOL(wpan_phy_for_each);
struct cfg802154_registered_device *
cfg802154_rdev_by_wpan_phy_idx(int wpan_phy_idx)
{
struct cfg802154_registered_device *result = NULL, *rdev;
ASSERT_RTNL();
list_for_each_entry(rdev, &cfg802154_rdev_list, list) {
if (rdev->wpan_phy_idx == wpan_phy_idx) {
result = rdev;
break;
}
}
return result;
}
struct wpan_phy *
wpan_phy_new(const struct cfg802154_ops *ops, size_t priv_size)
{
......@@ -270,8 +288,15 @@ static int __init wpan_phy_class_init(void)
if (rc)
goto err_notifier;
rc = nl802154_init();
if (rc)
goto err_ieee802154_nl;
return 0;
err_ieee802154_nl:
ieee802154_nl_exit();
err_notifier:
unregister_netdevice_notifier(&cfg802154_netdev_notifier);
err_nl:
......@@ -283,6 +308,7 @@ subsys_initcall(wpan_phy_class_init);
static void __exit wpan_phy_class_exit(void)
{
nl802154_exit();
ieee802154_nl_exit();
unregister_netdevice_notifier(&cfg802154_netdev_notifier);
wpan_phy_sysfs_exit();
......
......@@ -35,7 +35,11 @@ wpan_phy_to_rdev(struct wpan_phy *wpan_phy)
wpan_phy);
}
extern struct list_head cfg802154_rdev_list;
/* free object */
void cfg802154_dev_free(struct cfg802154_registered_device *rdev);
struct cfg802154_registered_device *
cfg802154_rdev_by_wpan_phy_idx(int wpan_phy_idx);
#endif /* __IEEE802154_CORE_H */
......@@ -15,7 +15,7 @@
#define IEEE_802154_LOCAL_H
int __init ieee802154_nl_init(void);
void __exit ieee802154_nl_exit(void);
void ieee802154_nl_exit(void);
#define IEEE802154_OP(_cmd, _func) \
{ \
......
......@@ -155,7 +155,7 @@ int __init ieee802154_nl_init(void)
ieee802154_mcgrps);
}
void __exit ieee802154_nl_exit(void)
void ieee802154_nl_exit(void)
{
genl_unregister_family(&nl802154_family);
}
/* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Authors:
* Alexander Aring <aar@pengutronix.de>
*
* Based on: net/wireless/nl80211.c
*/
#include <linux/rtnetlink.h>
#include <net/cfg802154.h>
#include <net/genetlink.h>
#include <net/mac802154.h>
#include <net/netlink.h>
#include <net/nl802154.h>
#include <net/sock.h>
#include "nl802154.h"
#include "core.h"
static int nl802154_pre_doit(const struct genl_ops *ops, struct sk_buff *skb,
struct genl_info *info);
static void nl802154_post_doit(const struct genl_ops *ops, struct sk_buff *skb,
struct genl_info *info);
/* the netlink family */
static struct genl_family nl802154_fam = {
.id = GENL_ID_GENERATE, /* don't bother with a hardcoded ID */
.name = NL802154_GENL_NAME, /* have users key off the name instead */
.hdrsize = 0, /* no private header */
.version = 1, /* no particular meaning now */
.maxattr = NL802154_ATTR_MAX,
.netnsok = true,
.pre_doit = nl802154_pre_doit,
.post_doit = nl802154_post_doit,
};
/* multicast groups */
enum nl802154_multicast_groups {
NL802154_MCGRP_CONFIG,
};
static const struct genl_multicast_group nl802154_mcgrps[] = {
[NL802154_MCGRP_CONFIG] = { .name = "config", },
};
/* returns ERR_PTR values */
static struct wpan_dev *
__cfg802154_wpan_dev_from_attrs(struct net *netns, struct nlattr **attrs)
{
struct cfg802154_registered_device *rdev;
struct wpan_dev *result = NULL;
bool have_ifidx = attrs[NL802154_ATTR_IFINDEX];
bool have_wpan_dev_id = attrs[NL802154_ATTR_WPAN_DEV];
u64 wpan_dev_id;
int wpan_phy_idx = -1;
int ifidx = -1;
ASSERT_RTNL();
if (!have_ifidx && !have_wpan_dev_id)
return ERR_PTR(-EINVAL);
if (have_ifidx)
ifidx = nla_get_u32(attrs[NL802154_ATTR_IFINDEX]);
if (have_wpan_dev_id) {
wpan_dev_id = nla_get_u64(attrs[NL802154_ATTR_WPAN_DEV]);
wpan_phy_idx = wpan_dev_id >> 32;
}
list_for_each_entry(rdev, &cfg802154_rdev_list, list) {
struct wpan_dev *wpan_dev;
/* TODO netns compare */
if (have_wpan_dev_id && rdev->wpan_phy_idx != wpan_phy_idx)
continue;
list_for_each_entry(wpan_dev, &rdev->wpan_dev_list, list) {
if (have_ifidx && wpan_dev->netdev &&
wpan_dev->netdev->ifindex == ifidx) {
result = wpan_dev;
break;
}
if (have_wpan_dev_id &&
wpan_dev->identifier == (u32)wpan_dev_id) {
result = wpan_dev;
break;
}
}
if (result)
break;
}
if (result)
return result;
return ERR_PTR(-ENODEV);
}
static struct cfg802154_registered_device *
__cfg802154_rdev_from_attrs(struct net *netns, struct nlattr **attrs)
{
struct cfg802154_registered_device *rdev = NULL, *tmp;
struct net_device *netdev;
ASSERT_RTNL();
if (!attrs[NL802154_ATTR_WPAN_PHY] &&
!attrs[NL802154_ATTR_IFINDEX] &&
!attrs[NL802154_ATTR_WPAN_DEV])
return ERR_PTR(-EINVAL);
if (attrs[NL802154_ATTR_WPAN_PHY])
rdev = cfg802154_rdev_by_wpan_phy_idx(
nla_get_u32(attrs[NL802154_ATTR_WPAN_PHY]));
if (attrs[NL802154_ATTR_WPAN_DEV]) {
u64 wpan_dev_id = nla_get_u64(attrs[NL802154_ATTR_WPAN_DEV]);
struct wpan_dev *wpan_dev;
bool found = false;
tmp = cfg802154_rdev_by_wpan_phy_idx(wpan_dev_id >> 32);
if (tmp) {
/* make sure wpan_dev exists */
list_for_each_entry(wpan_dev, &tmp->wpan_dev_list, list) {
if (wpan_dev->identifier != (u32)wpan_dev_id)
continue;
found = true;
break;
}
if (!found)
tmp = NULL;
if (rdev && tmp != rdev)
return ERR_PTR(-EINVAL);
rdev = tmp;
}
}
if (attrs[NL802154_ATTR_IFINDEX]) {
int ifindex = nla_get_u32(attrs[NL802154_ATTR_IFINDEX]);
netdev = __dev_get_by_index(netns, ifindex);
if (netdev) {
if (netdev->ieee802154_ptr)
tmp = wpan_phy_to_rdev(
netdev->ieee802154_ptr->wpan_phy);
else
tmp = NULL;
/* not wireless device -- return error */
if (!tmp)
return ERR_PTR(-EINVAL);
/* mismatch -- return error */
if (rdev && tmp != rdev)
return ERR_PTR(-EINVAL);
rdev = tmp;
}
}
if (!rdev)
return ERR_PTR(-ENODEV);
/* TODO netns compare */
return rdev;
}
/* This function returns a pointer to the driver
* that the genl_info item that is passed refers to.
*
* The result of this can be a PTR_ERR and hence must
* be checked with IS_ERR() for errors.
*/
static struct cfg802154_registered_device *
cfg802154_get_dev_from_info(struct net *netns, struct genl_info *info)
{
return __cfg802154_rdev_from_attrs(netns, info->attrs);
}
/* policy for the attributes */
static const struct nla_policy nl802154_policy[NL802154_ATTR_MAX+1] = {
};
/* message building helper */
static inline void *nl802154hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
int flags, u8 cmd)
{
/* since there is no private header just add the generic one */
return genlmsg_put(skb, portid, seq, &nl802154_fam, flags, cmd);
}
#define NL802154_FLAG_NEED_WPAN_PHY 0x01
#define NL802154_FLAG_NEED_NETDEV 0x02
#define NL802154_FLAG_NEED_RTNL 0x04
#define NL802154_FLAG_CHECK_NETDEV_UP 0x08
#define NL802154_FLAG_NEED_NETDEV_UP (NL802154_FLAG_NEED_NETDEV |\
NL802154_FLAG_CHECK_NETDEV_UP)
#define NL802154_FLAG_NEED_WPAN_DEV 0x10
#define NL802154_FLAG_NEED_WPAN_DEV_UP (NL802154_FLAG_NEED_WPAN_DEV |\
NL802154_FLAG_CHECK_NETDEV_UP)
static int nl802154_pre_doit(const struct genl_ops *ops, struct sk_buff *skb,
struct genl_info *info)
{
struct cfg802154_registered_device *rdev;
struct wpan_dev *wpan_dev;
struct net_device *dev;
bool rtnl = ops->internal_flags & NL802154_FLAG_NEED_RTNL;
if (rtnl)
rtnl_lock();
if (ops->internal_flags & NL802154_FLAG_NEED_WPAN_PHY) {
rdev = cfg802154_get_dev_from_info(genl_info_net(info), info);
if (IS_ERR(rdev)) {
if (rtnl)
rtnl_unlock();
return PTR_ERR(rdev);
}
info->user_ptr[0] = rdev;
} else if (ops->internal_flags & NL802154_FLAG_NEED_NETDEV ||
ops->internal_flags & NL802154_FLAG_NEED_WPAN_DEV) {
ASSERT_RTNL();
wpan_dev = __cfg802154_wpan_dev_from_attrs(genl_info_net(info),
info->attrs);
if (IS_ERR(wpan_dev)) {
if (rtnl)
rtnl_unlock();
return PTR_ERR(wpan_dev);
}
dev = wpan_dev->netdev;
rdev = wpan_phy_to_rdev(wpan_dev->wpan_phy);
if (ops->internal_flags & NL802154_FLAG_NEED_NETDEV) {
if (!dev) {
if (rtnl)
rtnl_unlock();
return -EINVAL;
}
info->user_ptr[1] = dev;
} else {
info->user_ptr[1] = wpan_dev;
}
if (dev) {
if (ops->internal_flags & NL802154_FLAG_CHECK_NETDEV_UP &&
!netif_running(dev)) {
if (rtnl)
rtnl_unlock();
return -ENETDOWN;
}
dev_hold(dev);
}
info->user_ptr[0] = rdev;
}
return 0;
}
static void nl802154_post_doit(const struct genl_ops *ops, struct sk_buff *skb,
struct genl_info *info)
{
if (info->user_ptr[1]) {
if (ops->internal_flags & NL802154_FLAG_NEED_WPAN_DEV) {
struct wpan_dev *wpan_dev = info->user_ptr[1];
if (wpan_dev->netdev)
dev_put(wpan_dev->netdev);
} else {
dev_put(info->user_ptr[1]);
}
}
if (ops->internal_flags & NL802154_FLAG_NEED_RTNL)
rtnl_unlock();
}
static const struct genl_ops nl802154_ops[] = {
};
/* initialisation/exit functions */
int nl802154_init(void)
{
return genl_register_family_with_ops_groups(&nl802154_fam, nl802154_ops,
nl802154_mcgrps);
}
void nl802154_exit(void)
{
genl_unregister_family(&nl802154_fam);
}
#ifndef __IEEE802154_NL802154_H
#define __IEEE802154_NL802154_H
int nl802154_init(void);
void nl802154_exit(void);
#endif /* __IEEE802154_NL802154_H */
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