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linux/include/net/cfg802154.h
Gustavo A. R. Silva 53cb2cfaa6 cfg802154: Replace zero-length array with flexible-array member 
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:

struct foo {
        int stuff;
        struct boo array[];
};

By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.

Also, notice that, dynamic memory allocations won't be affected by
this change:

"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]

This issue was found with the help of Coccinelle.

[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2020-02-29 14:39:08 +01:00

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2007, 2008, 2009 Siemens AG
*
* Written by:
* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
*/
#ifndef __NET_CFG802154_H
#define __NET_CFG802154_H
#include <linux/ieee802154.h>
#include <linux/netdevice.h>
#include <linux/mutex.h>
#include <linux/bug.h>
#include <net/nl802154.h>
struct wpan_phy;
struct wpan_phy_cca;
#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
struct ieee802154_llsec_device_key;
struct ieee802154_llsec_seclevel;
struct ieee802154_llsec_params;
struct ieee802154_llsec_device;
struct ieee802154_llsec_table;
struct ieee802154_llsec_key_id;
struct ieee802154_llsec_key;
#endif /* CONFIG_IEEE802154_NL802154_EXPERIMENTAL */
struct cfg802154_ops {
struct net_device * (*add_virtual_intf_deprecated)(struct wpan_phy *wpan_phy,
const char *name,
unsigned char name_assign_type,
int type);
void (*del_virtual_intf_deprecated)(struct wpan_phy *wpan_phy,
struct net_device *dev);
int (*suspend)(struct wpan_phy *wpan_phy);
int (*resume)(struct wpan_phy *wpan_phy);
int (*add_virtual_intf)(struct wpan_phy *wpan_phy,
const char *name,
unsigned char name_assign_type,
enum nl802154_iftype type,
__le64 extended_addr);
int (*del_virtual_intf)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev);
int (*set_channel)(struct wpan_phy *wpan_phy, u8 page, u8 channel);
int (*set_cca_mode)(struct wpan_phy *wpan_phy,
const struct wpan_phy_cca *cca);
int (*set_cca_ed_level)(struct wpan_phy *wpan_phy, s32 ed_level);
int (*set_tx_power)(struct wpan_phy *wpan_phy, s32 power);
int (*set_pan_id)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev, __le16 pan_id);
int (*set_short_addr)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev, __le16 short_addr);
int (*set_backoff_exponent)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev, u8 min_be,
u8 max_be);
int (*set_max_csma_backoffs)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev,
u8 max_csma_backoffs);
int (*set_max_frame_retries)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev,
s8 max_frame_retries);
int (*set_lbt_mode)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev, bool mode);
int (*set_ackreq_default)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev, bool ackreq);
#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
void (*get_llsec_table)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev,
struct ieee802154_llsec_table **table);
void (*lock_llsec_table)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev);
void (*unlock_llsec_table)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev);
/* TODO remove locking/get table callbacks, this is part of the
* nl802154 interface and should be accessible from ieee802154 layer.
*/
int (*get_llsec_params)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev,
struct ieee802154_llsec_params *params);
int (*set_llsec_params)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev,
const struct ieee802154_llsec_params *params,
int changed);
int (*add_llsec_key)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev,
const struct ieee802154_llsec_key_id *id,
const struct ieee802154_llsec_key *key);
int (*del_llsec_key)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev,
const struct ieee802154_llsec_key_id *id);
int (*add_seclevel)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev,
const struct ieee802154_llsec_seclevel *sl);
int (*del_seclevel)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev,
const struct ieee802154_llsec_seclevel *sl);
int (*add_device)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev,
const struct ieee802154_llsec_device *dev);
int (*del_device)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev, __le64 extended_addr);
int (*add_devkey)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev,
__le64 extended_addr,
const struct ieee802154_llsec_device_key *key);
int (*del_devkey)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev,
__le64 extended_addr,
const struct ieee802154_llsec_device_key *key);
#endif /* CONFIG_IEEE802154_NL802154_EXPERIMENTAL */
};
static inline bool
wpan_phy_supported_bool(bool b, enum nl802154_supported_bool_states st)
{
switch (st) {
case NL802154_SUPPORTED_BOOL_TRUE:
return b;
case NL802154_SUPPORTED_BOOL_FALSE:
return !b;
case NL802154_SUPPORTED_BOOL_BOTH:
return true;
default:
WARN_ON(1);
}
return false;
}
struct wpan_phy_supported {
u32 channels[IEEE802154_MAX_PAGE + 1],
cca_modes, cca_opts, iftypes;
enum nl802154_supported_bool_states lbt;
u8 min_minbe, max_minbe, min_maxbe, max_maxbe,
min_csma_backoffs, max_csma_backoffs;
s8 min_frame_retries, max_frame_retries;
size_t tx_powers_size, cca_ed_levels_size;
const s32 *tx_powers, *cca_ed_levels;
};
struct wpan_phy_cca {
enum nl802154_cca_modes mode;
enum nl802154_cca_opts opt;
};
static inline bool
wpan_phy_cca_cmp(const struct wpan_phy_cca *a, const struct wpan_phy_cca *b)
{
if (a->mode != b->mode)
return false;
if (a->mode == NL802154_CCA_ENERGY_CARRIER)
return a->opt == b->opt;
return true;
}
/**
* @WPAN_PHY_FLAG_TRANSMIT_POWER: Indicates that transceiver will support
* transmit power setting.
* @WPAN_PHY_FLAG_CCA_ED_LEVEL: Indicates that transceiver will support cca ed
* level setting.
* @WPAN_PHY_FLAG_CCA_MODE: Indicates that transceiver will support cca mode
* setting.
*/
enum wpan_phy_flags {
WPAN_PHY_FLAG_TXPOWER = BIT(1),
WPAN_PHY_FLAG_CCA_ED_LEVEL = BIT(2),
WPAN_PHY_FLAG_CCA_MODE = BIT(3),
};
struct wpan_phy {
/* If multiple wpan_phys are registered and you're handed e.g.
* a regular netdev with assigned ieee802154_ptr, you won't
* know whether it points to a wpan_phy your driver has registered
* or not. Assign this to something global to your driver to
* help determine whether you own this wpan_phy or not.
*/
const void *privid;
u32 flags;
/*
* This is a PIB according to 802.15.4-2011.
* We do not provide timing-related variables, as they
* aren't used outside of driver
*/
u8 current_channel;
u8 current_page;
struct wpan_phy_supported supported;
/* current transmit_power in mBm */
s32 transmit_power;
struct wpan_phy_cca cca;
__le64 perm_extended_addr;
/* current cca ed threshold in mBm */
s32 cca_ed_level;
/* PHY depended MAC PIB values */
/* 802.15.4 acronym: Tdsym in usec */
u8 symbol_duration;
/* lifs and sifs periods timing */
u16 lifs_period;
u16 sifs_period;
struct device dev;
/* the network namespace this phy lives in currently */
possible_net_t _net;
char priv[] __aligned(NETDEV_ALIGN);
};
static inline struct net *wpan_phy_net(struct wpan_phy *wpan_phy)
{
return read_pnet(&wpan_phy->_net);
}
static inline void wpan_phy_net_set(struct wpan_phy *wpan_phy, struct net *net)
{
write_pnet(&wpan_phy->_net, net);
}
struct ieee802154_addr {
u8 mode;
__le16 pan_id;
union {
__le16 short_addr;
__le64 extended_addr;
};
};
struct ieee802154_llsec_key_id {
u8 mode;
u8 id;
union {
struct ieee802154_addr device_addr;
__le32 short_source;
__le64 extended_source;
};
};
#define IEEE802154_LLSEC_KEY_SIZE 16
struct ieee802154_llsec_key {
u8 frame_types;
u32 cmd_frame_ids;
/* TODO replace with NL802154_KEY_SIZE */
u8 key[IEEE802154_LLSEC_KEY_SIZE];
};
struct ieee802154_llsec_key_entry {
struct list_head list;
struct ieee802154_llsec_key_id id;
struct ieee802154_llsec_key *key;
};
struct ieee802154_llsec_params {
bool enabled;
__be32 frame_counter;
u8 out_level;
struct ieee802154_llsec_key_id out_key;
__le64 default_key_source;
__le16 pan_id;
__le64 hwaddr;
__le64 coord_hwaddr;
__le16 coord_shortaddr;
};
struct ieee802154_llsec_table {
struct list_head keys;
struct list_head devices;
struct list_head security_levels;
};
struct ieee802154_llsec_seclevel {
struct list_head list;
u8 frame_type;
u8 cmd_frame_id;
bool device_override;
u32 sec_levels;
};
struct ieee802154_llsec_device {
struct list_head list;
__le16 pan_id;
__le16 short_addr;
__le64 hwaddr;
u32 frame_counter;
bool seclevel_exempt;
u8 key_mode;
struct list_head keys;
};
struct ieee802154_llsec_device_key {
struct list_head list;
struct ieee802154_llsec_key_id key_id;
u32 frame_counter;
};
struct wpan_dev_header_ops {
/* TODO create callback currently assumes ieee802154_mac_cb inside
* skb->cb. This should be changed to give these information as
* parameter.
*/
int (*create)(struct sk_buff *skb, struct net_device *dev,
const struct ieee802154_addr *daddr,
const struct ieee802154_addr *saddr,
unsigned int len);
};
struct wpan_dev {
struct wpan_phy *wpan_phy;
int iftype;
/* the remainder of this struct should be private to cfg802154 */
struct list_head list;
struct net_device *netdev;
const struct wpan_dev_header_ops *header_ops;
/* lowpan interface, set when the wpan_dev belongs to one lowpan_dev */
struct net_device *lowpan_dev;
u32 identifier;
/* MAC PIB */
__le16 pan_id;
__le16 short_addr;
__le64 extended_addr;
/* MAC BSN field */
atomic_t bsn;
/* MAC DSN field */
atomic_t dsn;
u8 min_be;
u8 max_be;
u8 csma_retries;
s8 frame_retries;
bool lbt;
bool promiscuous_mode;
/* fallback for acknowledgment bit setting */
bool ackreq;
};
#define to_phy(_dev) container_of(_dev, struct wpan_phy, dev)
static inline int
wpan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
const struct ieee802154_addr *daddr,
const struct ieee802154_addr *saddr,
unsigned int len)
{
struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
return wpan_dev->header_ops->create(skb, dev, daddr, saddr, len);
}
struct wpan_phy *
wpan_phy_new(const struct cfg802154_ops *ops, size_t priv_size);
static inline void wpan_phy_set_dev(struct wpan_phy *phy, struct device *dev)
{
phy->dev.parent = dev;
}
int wpan_phy_register(struct wpan_phy *phy);
void wpan_phy_unregister(struct wpan_phy *phy);
void wpan_phy_free(struct wpan_phy *phy);
/* Same semantics as for class_for_each_device */
int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data), void *data);
static inline void *wpan_phy_priv(struct wpan_phy *phy)
{
BUG_ON(!phy);
return &phy->priv;
}
struct wpan_phy *wpan_phy_find(const char *str);
static inline void wpan_phy_put(struct wpan_phy *phy)
{
put_device(&phy->dev);
}
static inline const char *wpan_phy_name(struct wpan_phy *phy)
{
return dev_name(&phy->dev);
}
#endif /* __NET_CFG802154_H */
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