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ec394af5ea
linux/include/net/switchdev.h
Petr Machata ec394af5ea switchdev: SWITCHDEV_OBJ_PORT_{VLAN, MDB}(): Sanitize 
The two macros SWITCHDEV_OBJ_PORT_VLAN() and SWITCHDEV_OBJ_PORT_MDB()
expand to a container_of() call, yielding an appropriate container of
their sole argument. However, due to a name collision, the first
argument, i.e. the contained object pointer, is not the only one to get
expanded. The third argument, which is a structure member name, and
should be kept literal, gets expanded as well. The only safe way to use
these two macros is therefore to name the local variable passed to them
"obj".

To fix this, rename the sole argument of the two macros from
"obj" (which collides with the member name) to "OBJ". Additionally,
instead of passing "OBJ" to container_of() verbatim, parenthesize it, so
that a comma in the passed-in expression doesn't pollute the
container_of() invocation.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-11-23 18:02:23 -08:00

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/*
* include/net/switchdev.h - Switch device API
* Copyright (c) 2014-2015 Jiri Pirko <jiri@resnulli.us>
* Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef _LINUX_SWITCHDEV_H_
#define _LINUX_SWITCHDEV_H_
#include <linux/netdevice.h>
#include <linux/notifier.h>
#include <linux/list.h>
#include <net/ip_fib.h>
#define SWITCHDEV_F_NO_RECURSE BIT(0)
#define SWITCHDEV_F_SKIP_EOPNOTSUPP BIT(1)
#define SWITCHDEV_F_DEFER BIT(2)
struct switchdev_trans_item {
struct list_head list;
void *data;
void (*destructor)(const void *data);
};
struct switchdev_trans {
struct list_head item_list;
bool ph_prepare;
};
static inline bool switchdev_trans_ph_prepare(struct switchdev_trans *trans)
{
return trans && trans->ph_prepare;
}
static inline bool switchdev_trans_ph_commit(struct switchdev_trans *trans)
{
return trans && !trans->ph_prepare;
}
enum switchdev_attr_id {
SWITCHDEV_ATTR_ID_UNDEFINED,
SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
SWITCHDEV_ATTR_ID_PORT_STP_STATE,
SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS,
SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT,
SWITCHDEV_ATTR_ID_PORT_MROUTER,
SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME,
SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
};
struct switchdev_attr {
struct net_device *orig_dev;
enum switchdev_attr_id id;
u32 flags;
void *complete_priv;
void (*complete)(struct net_device *dev, int err, void *priv);
union {
struct netdev_phys_item_id ppid; /* PORT_PARENT_ID */
u8 stp_state; /* PORT_STP_STATE */
unsigned long brport_flags; /* PORT_BRIDGE_FLAGS */
unsigned long brport_flags_support; /* PORT_BRIDGE_FLAGS_SUPPORT */
bool mrouter; /* PORT_MROUTER */
clock_t ageing_time; /* BRIDGE_AGEING_TIME */
bool vlan_filtering; /* BRIDGE_VLAN_FILTERING */
bool mc_disabled; /* MC_DISABLED */
} u;
};
enum switchdev_obj_id {
SWITCHDEV_OBJ_ID_UNDEFINED,
SWITCHDEV_OBJ_ID_PORT_VLAN,
SWITCHDEV_OBJ_ID_PORT_MDB,
SWITCHDEV_OBJ_ID_HOST_MDB,
};
struct switchdev_obj {
struct net_device *orig_dev;
enum switchdev_obj_id id;
u32 flags;
void *complete_priv;
void (*complete)(struct net_device *dev, int err, void *priv);
};
/* SWITCHDEV_OBJ_ID_PORT_VLAN */
struct switchdev_obj_port_vlan {
struct switchdev_obj obj;
u16 flags;
u16 vid_begin;
u16 vid_end;
};
#define SWITCHDEV_OBJ_PORT_VLAN(OBJ) \
container_of((OBJ), struct switchdev_obj_port_vlan, obj)
/* SWITCHDEV_OBJ_ID_PORT_MDB */
struct switchdev_obj_port_mdb {
struct switchdev_obj obj;
unsigned char addr[ETH_ALEN];
u16 vid;
};
#define SWITCHDEV_OBJ_PORT_MDB(OBJ) \
container_of((OBJ), struct switchdev_obj_port_mdb, obj)
void switchdev_trans_item_enqueue(struct switchdev_trans *trans,
void *data, void (*destructor)(void const *),
struct switchdev_trans_item *tritem);
void *switchdev_trans_item_dequeue(struct switchdev_trans *trans);
typedef int switchdev_obj_dump_cb_t(struct switchdev_obj *obj);
/**
* struct switchdev_ops - switchdev operations
*
* @switchdev_port_attr_get: Get a port attribute (see switchdev_attr).
*
* @switchdev_port_attr_set: Set a port attribute (see switchdev_attr).
*
* @switchdev_port_obj_add: Add an object to port (see switchdev_obj_*).
*
* @switchdev_port_obj_del: Delete an object from port (see switchdev_obj_*).
*/
struct switchdev_ops {
int (*switchdev_port_attr_get)(struct net_device *dev,
struct switchdev_attr *attr);
int (*switchdev_port_attr_set)(struct net_device *dev,
const struct switchdev_attr *attr,
struct switchdev_trans *trans);
int (*switchdev_port_obj_add)(struct net_device *dev,
const struct switchdev_obj *obj,
struct switchdev_trans *trans);
int (*switchdev_port_obj_del)(struct net_device *dev,
const struct switchdev_obj *obj);
};
enum switchdev_notifier_type {
SWITCHDEV_FDB_ADD_TO_BRIDGE = 1,
SWITCHDEV_FDB_DEL_TO_BRIDGE,
SWITCHDEV_FDB_ADD_TO_DEVICE,
SWITCHDEV_FDB_DEL_TO_DEVICE,
SWITCHDEV_FDB_OFFLOADED,
SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE,
SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE,
SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE,
SWITCHDEV_VXLAN_FDB_OFFLOADED,
};
struct switchdev_notifier_info {
struct net_device *dev;
};
struct switchdev_notifier_fdb_info {
struct switchdev_notifier_info info; /* must be first */
const unsigned char *addr;
u16 vid;
u8 added_by_user:1,
offloaded:1;
};
static inline struct net_device *
switchdev_notifier_info_to_dev(const struct switchdev_notifier_info *info)
{
return info->dev;
}
#ifdef CONFIG_NET_SWITCHDEV
void switchdev_deferred_process(void);
int switchdev_port_attr_get(struct net_device *dev,
struct switchdev_attr *attr);
int switchdev_port_attr_set(struct net_device *dev,
const struct switchdev_attr *attr);
int switchdev_port_obj_add(struct net_device *dev,
const struct switchdev_obj *obj);
int switchdev_port_obj_del(struct net_device *dev,
const struct switchdev_obj *obj);
int register_switchdev_notifier(struct notifier_block *nb);
int unregister_switchdev_notifier(struct notifier_block *nb);
int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
struct switchdev_notifier_info *info);
void switchdev_port_fwd_mark_set(struct net_device *dev,
struct net_device *group_dev,
bool joining);
bool switchdev_port_same_parent_id(struct net_device *a,
struct net_device *b);
#define SWITCHDEV_SET_OPS(netdev, ops) ((netdev)->switchdev_ops = (ops))
#else
static inline void switchdev_deferred_process(void)
{
}
static inline int switchdev_port_attr_get(struct net_device *dev,
struct switchdev_attr *attr)
{
return -EOPNOTSUPP;
}
static inline int switchdev_port_attr_set(struct net_device *dev,
const struct switchdev_attr *attr)
{
return -EOPNOTSUPP;
}
static inline int switchdev_port_obj_add(struct net_device *dev,
const struct switchdev_obj *obj)
{
return -EOPNOTSUPP;
}
static inline int switchdev_port_obj_del(struct net_device *dev,
const struct switchdev_obj *obj)
{
return -EOPNOTSUPP;
}
static inline int register_switchdev_notifier(struct notifier_block *nb)
{
return 0;
}
static inline int unregister_switchdev_notifier(struct notifier_block *nb)
{
return 0;
}
static inline int call_switchdev_notifiers(unsigned long val,
struct net_device *dev,
struct switchdev_notifier_info *info)
{
return NOTIFY_DONE;
}
static inline bool switchdev_port_same_parent_id(struct net_device *a,
struct net_device *b)
{
return false;
}
#define SWITCHDEV_SET_OPS(netdev, ops) do {} while (0)
#endif
#endif /* _LINUX_SWITCHDEV_H_ */
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