mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
c380cd5a00
atomic_t variables are currently used to implement reference counters with the following properties: - counter is initialized to 1 using atomic_set() - a resource is freed upon counter reaching zero - once counter reaches zero, its further increments aren't allowed - counter schema uses basic atomic operations (set, inc, inc_not_zero, dec_and_test, etc.) Such atomic variables should be converted to a newly provided refcount_t type and API that prevents accidental counter overflows and underflows. This is important since overflows and underflows can lead to use-after-free situation and be exploitable. The variable lcs_reply.refcnt is used as pure reference counter. Convert it to refcount_t and fix up the operations. Suggested-by: Kees Cook <keescook@chromium.org> Reviewed-by: David Windsor <dwindsor@gmail.com> Reviewed-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> [jwi: removed the WARN_ONs. Use CONFIG_REFCOUNT_FULL if you care.] Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
342 lines
7.5 KiB
C
342 lines
7.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*lcs.h*/
|
|
|
|
#include <linux/interrupt.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/refcount.h>
|
|
#include <asm/ccwdev.h>
|
|
|
|
#define LCS_DBF_TEXT(level, name, text) \
|
|
do { \
|
|
debug_text_event(lcs_dbf_##name, level, text); \
|
|
} while (0)
|
|
|
|
#define LCS_DBF_HEX(level,name,addr,len) \
|
|
do { \
|
|
debug_event(lcs_dbf_##name,level,(void*)(addr),len); \
|
|
} while (0)
|
|
|
|
#define LCS_DBF_TEXT_(level,name,text...) \
|
|
do { \
|
|
if (debug_level_enabled(lcs_dbf_##name, level)) { \
|
|
sprintf(debug_buffer, text); \
|
|
debug_text_event(lcs_dbf_##name, level, debug_buffer); \
|
|
} \
|
|
} while (0)
|
|
|
|
/**
|
|
* sysfs related stuff
|
|
*/
|
|
#define CARD_FROM_DEV(cdev) \
|
|
(struct lcs_card *) dev_get_drvdata( \
|
|
&((struct ccwgroup_device *)dev_get_drvdata(&cdev->dev))->dev);
|
|
|
|
/**
|
|
* Enum for classifying detected devices.
|
|
*/
|
|
enum lcs_channel_types {
|
|
/* Device is not a channel */
|
|
lcs_channel_type_none,
|
|
|
|
/* Device is a 2216 channel */
|
|
lcs_channel_type_parallel,
|
|
|
|
/* Device is a 2216 channel */
|
|
lcs_channel_type_2216,
|
|
|
|
/* Device is a OSA2 card */
|
|
lcs_channel_type_osa2
|
|
};
|
|
|
|
/**
|
|
* CCW commands used in this driver
|
|
*/
|
|
#define LCS_CCW_WRITE 0x01
|
|
#define LCS_CCW_READ 0x02
|
|
#define LCS_CCW_TRANSFER 0x08
|
|
|
|
/**
|
|
* LCS device status primitives
|
|
*/
|
|
#define LCS_CMD_STARTLAN 0x01
|
|
#define LCS_CMD_STOPLAN 0x02
|
|
#define LCS_CMD_LANSTAT 0x04
|
|
#define LCS_CMD_STARTUP 0x07
|
|
#define LCS_CMD_SHUTDOWN 0x08
|
|
#define LCS_CMD_QIPASSIST 0xb2
|
|
#define LCS_CMD_SETIPM 0xb4
|
|
#define LCS_CMD_DELIPM 0xb5
|
|
|
|
#define LCS_INITIATOR_TCPIP 0x00
|
|
#define LCS_INITIATOR_LGW 0x01
|
|
#define LCS_STD_CMD_SIZE 16
|
|
#define LCS_MULTICAST_CMD_SIZE 404
|
|
|
|
/**
|
|
* LCS IPASSIST MASKS,only used when multicast is switched on
|
|
*/
|
|
/* Not supported by LCS */
|
|
#define LCS_IPASS_ARP_PROCESSING 0x0001
|
|
#define LCS_IPASS_IN_CHECKSUM_SUPPORT 0x0002
|
|
#define LCS_IPASS_OUT_CHECKSUM_SUPPORT 0x0004
|
|
#define LCS_IPASS_IP_FRAG_REASSEMBLY 0x0008
|
|
#define LCS_IPASS_IP_FILTERING 0x0010
|
|
/* Supported by lcs 3172 */
|
|
#define LCS_IPASS_IPV6_SUPPORT 0x0020
|
|
#define LCS_IPASS_MULTICAST_SUPPORT 0x0040
|
|
|
|
/**
|
|
* LCS sense byte definitions
|
|
*/
|
|
#define LCS_SENSE_BYTE_0 0
|
|
#define LCS_SENSE_BYTE_1 1
|
|
#define LCS_SENSE_BYTE_2 2
|
|
#define LCS_SENSE_BYTE_3 3
|
|
#define LCS_SENSE_INTERFACE_DISCONNECT 0x01
|
|
#define LCS_SENSE_EQUIPMENT_CHECK 0x10
|
|
#define LCS_SENSE_BUS_OUT_CHECK 0x20
|
|
#define LCS_SENSE_INTERVENTION_REQUIRED 0x40
|
|
#define LCS_SENSE_CMD_REJECT 0x80
|
|
#define LCS_SENSE_RESETTING_EVENT 0x80
|
|
#define LCS_SENSE_DEVICE_ONLINE 0x20
|
|
|
|
/**
|
|
* LCS packet type definitions
|
|
*/
|
|
#define LCS_FRAME_TYPE_CONTROL 0
|
|
#define LCS_FRAME_TYPE_ENET 1
|
|
#define LCS_FRAME_TYPE_TR 2
|
|
#define LCS_FRAME_TYPE_FDDI 7
|
|
#define LCS_FRAME_TYPE_AUTO -1
|
|
|
|
/**
|
|
* some more definitions,we will sort them later
|
|
*/
|
|
#define LCS_ILLEGAL_OFFSET 0xffff
|
|
#define LCS_IOBUFFERSIZE 0x5000
|
|
#define LCS_NUM_BUFFS 32 /* needs to be power of 2 */
|
|
#define LCS_MAC_LENGTH 6
|
|
#define LCS_INVALID_PORT_NO -1
|
|
#define LCS_LANCMD_TIMEOUT_DEFAULT 5
|
|
|
|
/**
|
|
* Multicast state
|
|
*/
|
|
#define LCS_IPM_STATE_SET_REQUIRED 0
|
|
#define LCS_IPM_STATE_DEL_REQUIRED 1
|
|
#define LCS_IPM_STATE_ON_CARD 2
|
|
|
|
/**
|
|
* LCS IP Assist declarations
|
|
* seems to be only used for multicast
|
|
*/
|
|
#define LCS_IPASS_ARP_PROCESSING 0x0001
|
|
#define LCS_IPASS_INBOUND_CSUM_SUPP 0x0002
|
|
#define LCS_IPASS_OUTBOUND_CSUM_SUPP 0x0004
|
|
#define LCS_IPASS_IP_FRAG_REASSEMBLY 0x0008
|
|
#define LCS_IPASS_IP_FILTERING 0x0010
|
|
#define LCS_IPASS_IPV6_SUPPORT 0x0020
|
|
#define LCS_IPASS_MULTICAST_SUPPORT 0x0040
|
|
|
|
/**
|
|
* LCS Buffer states
|
|
*/
|
|
enum lcs_buffer_states {
|
|
LCS_BUF_STATE_EMPTY, /* buffer is empty */
|
|
LCS_BUF_STATE_LOCKED, /* buffer is locked, don't touch */
|
|
LCS_BUF_STATE_READY, /* buffer is ready for read/write */
|
|
LCS_BUF_STATE_PROCESSED,
|
|
};
|
|
|
|
/**
|
|
* LCS Channel State Machine declarations
|
|
*/
|
|
enum lcs_channel_states {
|
|
LCS_CH_STATE_INIT,
|
|
LCS_CH_STATE_HALTED,
|
|
LCS_CH_STATE_STOPPED,
|
|
LCS_CH_STATE_RUNNING,
|
|
LCS_CH_STATE_SUSPENDED,
|
|
LCS_CH_STATE_CLEARED,
|
|
LCS_CH_STATE_ERROR,
|
|
};
|
|
|
|
/**
|
|
* LCS device state machine
|
|
*/
|
|
enum lcs_dev_states {
|
|
DEV_STATE_DOWN,
|
|
DEV_STATE_UP,
|
|
DEV_STATE_RECOVER,
|
|
};
|
|
|
|
enum lcs_threads {
|
|
LCS_SET_MC_THREAD = 1,
|
|
LCS_RECOVERY_THREAD = 2,
|
|
};
|
|
|
|
/**
|
|
* LCS struct declarations
|
|
*/
|
|
struct lcs_header {
|
|
__u16 offset;
|
|
__u8 type;
|
|
__u8 slot;
|
|
} __attribute__ ((packed));
|
|
|
|
struct lcs_ip_mac_pair {
|
|
__be32 ip_addr;
|
|
__u8 mac_addr[LCS_MAC_LENGTH];
|
|
__u8 reserved[2];
|
|
} __attribute__ ((packed));
|
|
|
|
struct lcs_ipm_list {
|
|
struct list_head list;
|
|
struct lcs_ip_mac_pair ipm;
|
|
__u8 ipm_state;
|
|
};
|
|
|
|
struct lcs_cmd {
|
|
__u16 offset;
|
|
__u8 type;
|
|
__u8 slot;
|
|
__u8 cmd_code;
|
|
__u8 initiator;
|
|
__u16 sequence_no;
|
|
__u16 return_code;
|
|
union {
|
|
struct {
|
|
__u8 lan_type;
|
|
__u8 portno;
|
|
__u16 parameter_count;
|
|
__u8 operator_flags[3];
|
|
__u8 reserved[3];
|
|
} lcs_std_cmd;
|
|
struct {
|
|
__u16 unused1;
|
|
__u16 buff_size;
|
|
__u8 unused2[6];
|
|
} lcs_startup;
|
|
struct {
|
|
__u8 lan_type;
|
|
__u8 portno;
|
|
__u8 unused[10];
|
|
__u8 mac_addr[LCS_MAC_LENGTH];
|
|
__u32 num_packets_deblocked;
|
|
__u32 num_packets_blocked;
|
|
__u32 num_packets_tx_on_lan;
|
|
__u32 num_tx_errors_detected;
|
|
__u32 num_tx_packets_disgarded;
|
|
__u32 num_packets_rx_from_lan;
|
|
__u32 num_rx_errors_detected;
|
|
__u32 num_rx_discarded_nobuffs_avail;
|
|
__u32 num_rx_packets_too_large;
|
|
} lcs_lanstat_cmd;
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
struct {
|
|
__u8 lan_type;
|
|
__u8 portno;
|
|
__u16 num_ip_pairs;
|
|
__u16 ip_assists_supported;
|
|
__u16 ip_assists_enabled;
|
|
__u16 version;
|
|
struct {
|
|
struct lcs_ip_mac_pair
|
|
ip_mac_pair[32];
|
|
__u32 response_data;
|
|
} lcs_ipass_ctlmsg __attribute ((packed));
|
|
} lcs_qipassist __attribute__ ((packed));
|
|
#endif /*CONFIG_IP_MULTICAST */
|
|
} cmd __attribute__ ((packed));
|
|
} __attribute__ ((packed));
|
|
|
|
/**
|
|
* Forward declarations.
|
|
*/
|
|
struct lcs_card;
|
|
struct lcs_channel;
|
|
|
|
/**
|
|
* Definition of an lcs buffer.
|
|
*/
|
|
struct lcs_buffer {
|
|
enum lcs_buffer_states state;
|
|
void *data;
|
|
int count;
|
|
/* Callback for completion notification. */
|
|
void (*callback)(struct lcs_channel *, struct lcs_buffer *);
|
|
};
|
|
|
|
struct lcs_reply {
|
|
struct list_head list;
|
|
__u16 sequence_no;
|
|
refcount_t refcnt;
|
|
/* Callback for completion notification. */
|
|
void (*callback)(struct lcs_card *, struct lcs_cmd *);
|
|
wait_queue_head_t wait_q;
|
|
struct lcs_card *card;
|
|
struct timer_list timer;
|
|
int received;
|
|
int rc;
|
|
};
|
|
|
|
/**
|
|
* Definition of an lcs channel
|
|
*/
|
|
struct lcs_channel {
|
|
enum lcs_channel_states state;
|
|
struct ccw_device *ccwdev;
|
|
struct ccw1 ccws[LCS_NUM_BUFFS + 1];
|
|
wait_queue_head_t wait_q;
|
|
struct tasklet_struct irq_tasklet;
|
|
struct lcs_buffer iob[LCS_NUM_BUFFS];
|
|
int io_idx;
|
|
int buf_idx;
|
|
};
|
|
|
|
|
|
/**
|
|
* definition of the lcs card
|
|
*/
|
|
struct lcs_card {
|
|
spinlock_t lock;
|
|
spinlock_t ipm_lock;
|
|
enum lcs_dev_states state;
|
|
struct net_device *dev;
|
|
struct net_device_stats stats;
|
|
__be16 (*lan_type_trans)(struct sk_buff *skb,
|
|
struct net_device *dev);
|
|
struct ccwgroup_device *gdev;
|
|
struct lcs_channel read;
|
|
struct lcs_channel write;
|
|
struct lcs_buffer *tx_buffer;
|
|
int tx_emitted;
|
|
struct list_head lancmd_waiters;
|
|
int lancmd_timeout;
|
|
|
|
struct work_struct kernel_thread_starter;
|
|
spinlock_t mask_lock;
|
|
unsigned long thread_start_mask;
|
|
unsigned long thread_running_mask;
|
|
unsigned long thread_allowed_mask;
|
|
wait_queue_head_t wait_q;
|
|
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
struct list_head ipm_list;
|
|
#endif
|
|
__u8 mac[LCS_MAC_LENGTH];
|
|
__u16 ip_assists_supported;
|
|
__u16 ip_assists_enabled;
|
|
__s8 lan_type;
|
|
__u32 pkt_seq;
|
|
__u16 sequence_no;
|
|
__s16 portno;
|
|
/* Some info copied from probeinfo */
|
|
u8 device_forced;
|
|
u8 max_port_no;
|
|
u8 hint_port_no;
|
|
s16 port_protocol_no;
|
|
} __attribute__ ((aligned(8)));
|
|
|