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linux/include/net/netrom.h
Jarek Poplawski d00c362f1b ax25: netrom: rose: Fix timer oopses 
Wrong ax25_cb refcounting in ax25_send_frame() and by its callers can
cause timer oopses (first reported with 2.6.29.6 kernel).

Fixes: http://bugzilla.kernel.org/show_bug.cgi?id=14905

Reported-by: Bernard Pidoux <bpidoux@free.fr>
Tested-by: Bernard Pidoux <bpidoux@free.fr>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-16 01:04:04 -08:00

270 lines
7.9 KiB
C
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/*
* 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 <net/sock.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;
atomic_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];
atomic_t refcount;
spinlock_t node_lock;
};
/*********************************************************************
* nr_node & nr_neigh lists, refcounting and locking
*********************************************************************/
#define nr_node_hold(__nr_node) \
atomic_inc(&((__nr_node)->refcount))
static __inline__ void nr_node_put(struct nr_node *nr_node)
{
if (atomic_dec_and_test(&nr_node->refcount)) {
kfree(nr_node);
}
}
#define nr_neigh_hold(__nr_neigh) \
atomic_inc(&((__nr_neigh)->refcount))
static __inline__ void nr_neigh_put(struct nr_neigh *nr_neigh)
{
if (atomic_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, node, list) \
hlist_for_each_entry(__nr_neigh, node, list, neigh_node)
#define nr_neigh_for_each_safe(__nr_neigh, node, node2, list) \
hlist_for_each_entry_safe(__nr_neigh, node, node2, list, neigh_node)
#define nr_node_for_each(__nr_node, node, list) \
hlist_for_each_entry(__nr_node, node, list, node_node)
#define nr_node_for_each_safe(__nr_node, node, node2, list) \
hlist_for_each_entry_safe(__nr_node, 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;
extern int nr_rx_frame(struct sk_buff *, struct net_device *);
extern void nr_destroy_socket(struct sock *);
/* nr_dev.c */
extern int nr_rx_ip(struct sk_buff *, struct net_device *);
extern void nr_setup(struct net_device *);
/* nr_in.c */
extern int nr_process_rx_frame(struct sock *, struct sk_buff *);
/* nr_loopback.c */
extern void nr_loopback_init(void);
extern void nr_loopback_clear(void);
extern int nr_loopback_queue(struct sk_buff *);
/* nr_out.c */
extern void nr_output(struct sock *, struct sk_buff *);
extern void nr_send_nak_frame(struct sock *);
extern void nr_kick(struct sock *);
extern void nr_transmit_buffer(struct sock *, struct sk_buff *);
extern void nr_establish_data_link(struct sock *);
extern void nr_enquiry_response(struct sock *);
extern void nr_check_iframes_acked(struct sock *, unsigned short);
/* nr_route.c */
extern void nr_rt_device_down(struct net_device *);
extern struct net_device *nr_dev_first(void);
extern struct net_device *nr_dev_get(ax25_address *);
extern int nr_rt_ioctl(unsigned int, void __user *);
extern void nr_link_failed(ax25_cb *, int);
extern 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;
extern void nr_rt_free(void);
/* nr_subr.c */
extern void nr_clear_queues(struct sock *);
extern void nr_frames_acked(struct sock *, unsigned short);
extern void nr_requeue_frames(struct sock *);
extern int nr_validate_nr(struct sock *, unsigned short);
extern int nr_in_rx_window(struct sock *, unsigned short);
extern void nr_write_internal(struct sock *, int);
extern 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)
extern void nr_disconnect(struct sock *, int);
/* nr_timer.c */
extern void nr_init_timers(struct sock *sk);
extern void nr_start_heartbeat(struct sock *);
extern void nr_start_t1timer(struct sock *);
extern void nr_start_t2timer(struct sock *);
extern void nr_start_t4timer(struct sock *);
extern void nr_start_idletimer(struct sock *);
extern void nr_stop_heartbeat(struct sock *);
extern void nr_stop_t1timer(struct sock *);
extern void nr_stop_t2timer(struct sock *);
extern void nr_stop_t4timer(struct sock *);
extern void nr_stop_idletimer(struct sock *);
extern int nr_t1timer_running(struct sock *);
/* sysctl_net_netrom.c */
extern void nr_register_sysctl(void);
extern void nr_unregister_sysctl(void);
#endif
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