mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Reshetova, Elena](/assets/img/avatar_default.png)
refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: David Windsor <dwindsor@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
270 lines
7.6 KiB
C
270 lines
7.6 KiB
C
/*
|
|
* Declarations of NET/ROM type objects.
|
|
*
|
|
* Jonathan Naylor G4KLX 9/4/95
|
|
*/
|
|
|
|
#ifndef _NETROM_H
|
|
#define _NETROM_H
|
|
|
|
#include <linux/netrom.h>
|
|
#include <linux/list.h>
|
|
#include <linux/slab.h>
|
|
#include <net/sock.h>
|
|
#include <linux/refcount.h>
|
|
|
|
#define NR_NETWORK_LEN 15
|
|
#define NR_TRANSPORT_LEN 5
|
|
|
|
#define NR_PROTO_IP 0x0C
|
|
|
|
#define NR_PROTOEXT 0x00
|
|
#define NR_CONNREQ 0x01
|
|
#define NR_CONNACK 0x02
|
|
#define NR_DISCREQ 0x03
|
|
#define NR_DISCACK 0x04
|
|
#define NR_INFO 0x05
|
|
#define NR_INFOACK 0x06
|
|
#define NR_RESET 0x07
|
|
|
|
#define NR_CHOKE_FLAG 0x80
|
|
#define NR_NAK_FLAG 0x40
|
|
#define NR_MORE_FLAG 0x20
|
|
|
|
/* Define Link State constants. */
|
|
enum {
|
|
NR_STATE_0,
|
|
NR_STATE_1,
|
|
NR_STATE_2,
|
|
NR_STATE_3
|
|
};
|
|
|
|
#define NR_COND_ACK_PENDING 0x01
|
|
#define NR_COND_REJECT 0x02
|
|
#define NR_COND_PEER_RX_BUSY 0x04
|
|
#define NR_COND_OWN_RX_BUSY 0x08
|
|
|
|
#define NR_DEFAULT_T1 120000 /* Outstanding frames - 120 seconds */
|
|
#define NR_DEFAULT_T2 5000 /* Response delay - 5 seconds */
|
|
#define NR_DEFAULT_N2 3 /* Number of Retries - 3 */
|
|
#define NR_DEFAULT_T4 180000 /* Busy Delay - 180 seconds */
|
|
#define NR_DEFAULT_IDLE 0 /* No Activity Timeout - none */
|
|
#define NR_DEFAULT_WINDOW 4 /* Default Window Size - 4 */
|
|
#define NR_DEFAULT_OBS 6 /* Default Obsolescence Count - 6 */
|
|
#define NR_DEFAULT_QUAL 10 /* Default Neighbour Quality - 10 */
|
|
#define NR_DEFAULT_TTL 16 /* Default Time To Live - 16 */
|
|
#define NR_DEFAULT_ROUTING 1 /* Is routing enabled ? */
|
|
#define NR_DEFAULT_FAILS 2 /* Link fails until route fails */
|
|
#define NR_DEFAULT_RESET 0 /* Sent / accept reset cmds? */
|
|
|
|
#define NR_MODULUS 256
|
|
#define NR_MAX_WINDOW_SIZE 127 /* Maximum Window Allowable - 127 */
|
|
#define NR_MAX_PACKET_SIZE 236 /* Maximum Packet Length - 236 */
|
|
|
|
struct nr_sock {
|
|
struct sock sock;
|
|
ax25_address user_addr, source_addr, dest_addr;
|
|
struct net_device *device;
|
|
unsigned char my_index, my_id;
|
|
unsigned char your_index, your_id;
|
|
unsigned char state, condition, bpqext, window;
|
|
unsigned short vs, vr, va, vl;
|
|
unsigned char n2, n2count;
|
|
unsigned long t1, t2, t4, idle;
|
|
unsigned short fraglen;
|
|
struct timer_list t1timer;
|
|
struct timer_list t2timer;
|
|
struct timer_list t4timer;
|
|
struct timer_list idletimer;
|
|
struct sk_buff_head ack_queue;
|
|
struct sk_buff_head reseq_queue;
|
|
struct sk_buff_head frag_queue;
|
|
};
|
|
|
|
#define nr_sk(sk) ((struct nr_sock *)(sk))
|
|
|
|
struct nr_neigh {
|
|
struct hlist_node neigh_node;
|
|
ax25_address callsign;
|
|
ax25_digi *digipeat;
|
|
ax25_cb *ax25;
|
|
struct net_device *dev;
|
|
unsigned char quality;
|
|
unsigned char locked;
|
|
unsigned short count;
|
|
unsigned int number;
|
|
unsigned char failed;
|
|
refcount_t refcount;
|
|
};
|
|
|
|
struct nr_route {
|
|
unsigned char quality;
|
|
unsigned char obs_count;
|
|
struct nr_neigh *neighbour;
|
|
};
|
|
|
|
struct nr_node {
|
|
struct hlist_node node_node;
|
|
ax25_address callsign;
|
|
char mnemonic[7];
|
|
unsigned char which;
|
|
unsigned char count;
|
|
struct nr_route routes[3];
|
|
refcount_t refcount;
|
|
spinlock_t node_lock;
|
|
};
|
|
|
|
/*********************************************************************
|
|
* nr_node & nr_neigh lists, refcounting and locking
|
|
*********************************************************************/
|
|
|
|
#define nr_node_hold(__nr_node) \
|
|
refcount_inc(&((__nr_node)->refcount))
|
|
|
|
static __inline__ void nr_node_put(struct nr_node *nr_node)
|
|
{
|
|
if (refcount_dec_and_test(&nr_node->refcount)) {
|
|
kfree(nr_node);
|
|
}
|
|
}
|
|
|
|
#define nr_neigh_hold(__nr_neigh) \
|
|
refcount_inc(&((__nr_neigh)->refcount))
|
|
|
|
static __inline__ void nr_neigh_put(struct nr_neigh *nr_neigh)
|
|
{
|
|
if (refcount_dec_and_test(&nr_neigh->refcount)) {
|
|
if (nr_neigh->ax25)
|
|
ax25_cb_put(nr_neigh->ax25);
|
|
kfree(nr_neigh->digipeat);
|
|
kfree(nr_neigh);
|
|
}
|
|
}
|
|
|
|
/* nr_node_lock and nr_node_unlock also hold/put the node's refcounter.
|
|
*/
|
|
static __inline__ void nr_node_lock(struct nr_node *nr_node)
|
|
{
|
|
nr_node_hold(nr_node);
|
|
spin_lock_bh(&nr_node->node_lock);
|
|
}
|
|
|
|
static __inline__ void nr_node_unlock(struct nr_node *nr_node)
|
|
{
|
|
spin_unlock_bh(&nr_node->node_lock);
|
|
nr_node_put(nr_node);
|
|
}
|
|
|
|
#define nr_neigh_for_each(__nr_neigh, list) \
|
|
hlist_for_each_entry(__nr_neigh, list, neigh_node)
|
|
|
|
#define nr_neigh_for_each_safe(__nr_neigh, node2, list) \
|
|
hlist_for_each_entry_safe(__nr_neigh, node2, list, neigh_node)
|
|
|
|
#define nr_node_for_each(__nr_node, list) \
|
|
hlist_for_each_entry(__nr_node, list, node_node)
|
|
|
|
#define nr_node_for_each_safe(__nr_node, node2, list) \
|
|
hlist_for_each_entry_safe(__nr_node, node2, list, node_node)
|
|
|
|
|
|
/*********************************************************************/
|
|
|
|
/* af_netrom.c */
|
|
extern int sysctl_netrom_default_path_quality;
|
|
extern int sysctl_netrom_obsolescence_count_initialiser;
|
|
extern int sysctl_netrom_network_ttl_initialiser;
|
|
extern int sysctl_netrom_transport_timeout;
|
|
extern int sysctl_netrom_transport_maximum_tries;
|
|
extern int sysctl_netrom_transport_acknowledge_delay;
|
|
extern int sysctl_netrom_transport_busy_delay;
|
|
extern int sysctl_netrom_transport_requested_window_size;
|
|
extern int sysctl_netrom_transport_no_activity_timeout;
|
|
extern int sysctl_netrom_routing_control;
|
|
extern int sysctl_netrom_link_fails_count;
|
|
extern int sysctl_netrom_reset_circuit;
|
|
|
|
int nr_rx_frame(struct sk_buff *, struct net_device *);
|
|
void nr_destroy_socket(struct sock *);
|
|
|
|
/* nr_dev.c */
|
|
int nr_rx_ip(struct sk_buff *, struct net_device *);
|
|
void nr_setup(struct net_device *);
|
|
|
|
/* nr_in.c */
|
|
int nr_process_rx_frame(struct sock *, struct sk_buff *);
|
|
|
|
/* nr_loopback.c */
|
|
void nr_loopback_init(void);
|
|
void nr_loopback_clear(void);
|
|
int nr_loopback_queue(struct sk_buff *);
|
|
|
|
/* nr_out.c */
|
|
void nr_output(struct sock *, struct sk_buff *);
|
|
void nr_send_nak_frame(struct sock *);
|
|
void nr_kick(struct sock *);
|
|
void nr_transmit_buffer(struct sock *, struct sk_buff *);
|
|
void nr_establish_data_link(struct sock *);
|
|
void nr_enquiry_response(struct sock *);
|
|
void nr_check_iframes_acked(struct sock *, unsigned short);
|
|
|
|
/* nr_route.c */
|
|
void nr_rt_device_down(struct net_device *);
|
|
struct net_device *nr_dev_first(void);
|
|
struct net_device *nr_dev_get(ax25_address *);
|
|
int nr_rt_ioctl(unsigned int, void __user *);
|
|
void nr_link_failed(ax25_cb *, int);
|
|
int nr_route_frame(struct sk_buff *, ax25_cb *);
|
|
extern const struct file_operations nr_nodes_fops;
|
|
extern const struct file_operations nr_neigh_fops;
|
|
void nr_rt_free(void);
|
|
|
|
/* nr_subr.c */
|
|
void nr_clear_queues(struct sock *);
|
|
void nr_frames_acked(struct sock *, unsigned short);
|
|
void nr_requeue_frames(struct sock *);
|
|
int nr_validate_nr(struct sock *, unsigned short);
|
|
int nr_in_rx_window(struct sock *, unsigned short);
|
|
void nr_write_internal(struct sock *, int);
|
|
|
|
void __nr_transmit_reply(struct sk_buff *skb, int mine, unsigned char cmdflags);
|
|
|
|
/*
|
|
* This routine is called when a Connect Acknowledge with the Choke Flag
|
|
* set is needed to refuse a connection.
|
|
*/
|
|
#define nr_transmit_refusal(skb, mine) \
|
|
do { \
|
|
__nr_transmit_reply((skb), (mine), NR_CONNACK | NR_CHOKE_FLAG); \
|
|
} while (0)
|
|
|
|
/*
|
|
* This routine is called when we don't have a circuit matching an incoming
|
|
* NET/ROM packet. This is an G8PZT Xrouter extension.
|
|
*/
|
|
#define nr_transmit_reset(skb, mine) \
|
|
do { \
|
|
__nr_transmit_reply((skb), (mine), NR_RESET); \
|
|
} while (0)
|
|
|
|
void nr_disconnect(struct sock *, int);
|
|
|
|
/* nr_timer.c */
|
|
void nr_init_timers(struct sock *sk);
|
|
void nr_start_heartbeat(struct sock *);
|
|
void nr_start_t1timer(struct sock *);
|
|
void nr_start_t2timer(struct sock *);
|
|
void nr_start_t4timer(struct sock *);
|
|
void nr_start_idletimer(struct sock *);
|
|
void nr_stop_heartbeat(struct sock *);
|
|
void nr_stop_t1timer(struct sock *);
|
|
void nr_stop_t2timer(struct sock *);
|
|
void nr_stop_t4timer(struct sock *);
|
|
void nr_stop_idletimer(struct sock *);
|
|
int nr_t1timer_running(struct sock *);
|
|
|
|
/* sysctl_net_netrom.c */
|
|
void nr_register_sysctl(void);
|
|
void nr_unregister_sysctl(void);
|
|
|
|
#endif
|