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[ROSE]: Fix dereference of skb pointer after free.
[mirror_ubuntu-zesty-kernel.git] / include / net / ax25.h
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1da177e4
LT		 1/*
2 * Declarations of AX.25 type objects.
3 *
4 * Alan Cox (GW4PTS) 10/11/93
5 */
6#ifndef _AX25_H
7#define _AX25_H
8
1da177e4
LT		 9#include <linux/ax25.h>
10#include <linux/spinlock.h>
11#include <linux/timer.h>
12#include <linux/list.h>
13#include <asm/atomic.h>
14
15#define AX25_T1CLAMPLO 1
16#define AX25_T1CLAMPHI (30 * HZ)
17
18#define AX25_BPQ_HEADER_LEN 16
19#define AX25_KISS_HEADER_LEN 1
20
21#define AX25_HEADER_LEN 17
22#define AX25_ADDR_LEN 7
23#define AX25_DIGI_HEADER_LEN (AX25_MAX_DIGIS * AX25_ADDR_LEN)
24#define AX25_MAX_HEADER_LEN (AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN)
25
26/* AX.25 Protocol IDs */
27#define AX25_P_ROSE 0x01
3bf0ae7b
RB		 28#define AX25_P_VJCOMP 0x06 /* Compressed TCP/IP packet */
29 /* Van Jacobsen (RFC 1144) */
30#define AX25_P_VJUNCOMP 0x07 /* Uncompressed TCP/IP packet */
31 /* Van Jacobsen (RFC 1144) */
32#define AX25_P_SEGMENT 0x08 /* Segmentation fragment */
33#define AX25_P_TEXNET 0xc3 /* TEXTNET datagram protocol */
34#define AX25_P_LQ 0xc4 /* Link Quality Protocol */
35#define AX25_P_ATALK 0xca /* Appletalk */
36#define AX25_P_ATALK_ARP 0xcb /* Appletalk ARP */
37#define AX25_P_IP 0xcc /* ARPA Internet Protocol */
38#define AX25_P_ARP 0xcd /* ARPA Adress Resolution */
39#define AX25_P_FLEXNET 0xce /* FlexNet */
40#define AX25_P_NETROM 0xcf /* NET/ROM */
41#define AX25_P_TEXT 0xF0 /* No layer 3 protocol impl. */
1da177e4
LT		 42
43/* AX.25 Segment control values */
44#define AX25_SEG_REM 0x7F
45#define AX25_SEG_FIRST 0x80
46
47#define AX25_CBIT 0x80 /* Command/Response bit */
48#define AX25_EBIT 0x01 /* HDLC Address Extension bit */
49#define AX25_HBIT 0x80 /* Has been repeated bit */
50
51#define AX25_SSSID_SPARE 0x60 /* Unused bits in SSID for standard AX.25 */
52#define AX25_ESSID_SPARE 0x20 /* Unused bits in SSID for extended AX.25 */
53#define AX25_DAMA_FLAG 0x20 /* Well, it is *NOT* unused! (dl1bke 951121 */
54
55#define AX25_COND_ACK_PENDING 0x01
56#define AX25_COND_REJECT 0x02
57#define AX25_COND_PEER_RX_BUSY 0x04
58#define AX25_COND_OWN_RX_BUSY 0x08
59#define AX25_COND_DAMA_MODE 0x10
60
61#ifndef _LINUX_NETDEVICE_H
62#include <linux/netdevice.h>
63#endif
64
65/* Upper sub-layer (LAPB) definitions */
66
67/* Control field templates */
68#define AX25_I 0x00 /* Information frames */
69#define AX25_S 0x01 /* Supervisory frames */
70#define AX25_RR 0x01 /* Receiver ready */
71#define AX25_RNR 0x05 /* Receiver not ready */
72#define AX25_REJ 0x09 /* Reject */
73#define AX25_U 0x03 /* Unnumbered frames */
74#define AX25_SABM 0x2f /* Set Asynchronous Balanced Mode */
75#define AX25_SABME 0x6f /* Set Asynchronous Balanced Mode Extended */
76#define AX25_DISC 0x43 /* Disconnect */
77#define AX25_DM 0x0f /* Disconnected mode */
78#define AX25_UA 0x63 /* Unnumbered acknowledge */
79#define AX25_FRMR 0x87 /* Frame reject */
80#define AX25_UI 0x03 /* Unnumbered information */
81#define AX25_XID 0xaf /* Exchange information */
82#define AX25_TEST 0xe3 /* Test */
83
84#define AX25_PF 0x10 /* Poll/final bit for standard AX.25 */
85#define AX25_EPF 0x01 /* Poll/final bit for extended AX.25 */
86
87#define AX25_ILLEGAL 0x100 /* Impossible to be a real frame type */
88
89#define AX25_POLLOFF 0
90#define AX25_POLLON 1
91
92/* AX25 L2 C-bit */
93#define AX25_COMMAND 1
94#define AX25_RESPONSE 2
95
96/* Define Link State constants. */
97
98enum {
b01ef8ff
RB		 99 AX25_STATE_0, /* Listening */
100 AX25_STATE_1, /* SABM sent */
101 AX25_STATE_2, /* DISC sent */
102 AX25_STATE_3, /* Established */
103 AX25_STATE_4 /* Recovery */
1da177e4
LT		 104};
105
106#define AX25_MODULUS 8 /* Standard AX.25 modulus */
107#define AX25_EMODULUS 128 /* Extended AX.25 modulus */
108
109enum {
110 AX25_PROTO_STD_SIMPLEX,
111 AX25_PROTO_STD_DUPLEX,
c7c694d1 112#ifdef CONFIG_AX25_DAMA_SLAVE
1da177e4 113 AX25_PROTO_DAMA_SLAVE,
c7c694d1
RB		 114#ifdef CONFIG_AX25_DAMA_MASTER
115 AX25_PROTO_DAMA_MASTER,
116#define AX25_PROTO_MAX AX25_PROTO_DAMA_MASTER
117#endif
118#endif
119 __AX25_PROTO_MAX,
120 AX25_PROTO_MAX = __AX25_PROTO_MAX -1
1da177e4
LT		 121};
122
123enum {
124 AX25_VALUES_IPDEFMODE, /* 0=DG 1=VC */
125 AX25_VALUES_AXDEFMODE, /* 0=Normal 1=Extended Seq Nos */
126 AX25_VALUES_BACKOFF, /* 0=None 1=Linear 2=Exponential */
127 AX25_VALUES_CONMODE, /* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */
128 AX25_VALUES_WINDOW, /* Default window size for standard AX.25 */
129 AX25_VALUES_EWINDOW, /* Default window size for extended AX.25 */
130 AX25_VALUES_T1, /* Default T1 timeout value */
131 AX25_VALUES_T2, /* Default T2 timeout value */
132 AX25_VALUES_T3, /* Default T3 timeout value */
133 AX25_VALUES_IDLE, /* Connected mode idle timer */
134 AX25_VALUES_N2, /* Default N2 value */
135 AX25_VALUES_PACLEN, /* AX.25 MTU */
136 AX25_VALUES_PROTOCOL, /* Std AX.25, DAMA Slave, DAMA Master */
137 AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */
138 AX25_MAX_VALUES /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */
139};
140
141#define AX25_DEF_IPDEFMODE 0 /* Datagram */
142#define AX25_DEF_AXDEFMODE 0 /* Normal */
143#define AX25_DEF_BACKOFF 1 /* Linear backoff */
144#define AX25_DEF_CONMODE 2 /* Connected mode allowed */
145#define AX25_DEF_WINDOW 2 /* Window=2 */
146#define AX25_DEF_EWINDOW 32 /* Module-128 Window=32 */
e1fdb5b3
RB		 147#define AX25_DEF_T1 10000 /* T1=10s */
148#define AX25_DEF_T2 3000 /* T2=3s */
149#define AX25_DEF_T3 300000 /* T3=300s */
1da177e4 150#define AX25_DEF_N2 10 /* N2=10 */
e1fdb5b3 151#define AX25_DEF_IDLE 0 /* Idle=None */
1da177e4
LT		 152#define AX25_DEF_PACLEN 256 /* Paclen=256 */
153#define AX25_DEF_PROTOCOL AX25_PROTO_STD_SIMPLEX /* Standard AX.25 */
e1fdb5b3 154#define AX25_DEF_DS_TIMEOUT 180000 /* DAMA timeout 3 minutes */
1da177e4
LT		 155
156typedef struct ax25_uid_assoc {
01d7dd0e
RB		 157 struct hlist_node uid_node;
158 atomic_t refcount;
1da177e4
LT		 159 uid_t uid;
160 ax25_address call;
161} ax25_uid_assoc;
162
01d7dd0e
RB		 163#define ax25_uid_for_each(__ax25, node, list) \
164 hlist_for_each_entry(__ax25, node, list, uid_node)
165
166#define ax25_uid_hold(ax25) \
167 atomic_inc(&((ax25)->refcount))
168
169static inline void ax25_uid_put(ax25_uid_assoc *assoc)
170{
171 if (atomic_dec_and_test(&assoc->refcount)) {
172 kfree(assoc);
173 }
174}
175
1da177e4
LT		 176typedef struct {
177 ax25_address calls[AX25_MAX_DIGIS];
178 unsigned char repeated[AX25_MAX_DIGIS];
179 unsigned char ndigi;
4595f251 180 signed char lastrepeat;
1da177e4
LT		 181} ax25_digi;
182
183typedef struct ax25_route {
184 struct ax25_route *next;
185 atomic_t ref;
186 ax25_address callsign;
187 struct net_device *dev;
188 ax25_digi *digipeat;
189 char ip_mode;
190 struct timer_list timer;
191} ax25_route;
192
193typedef struct {
194 char slave; /* slave_mode? */
195 struct timer_list slave_timer; /* timeout timer */
196 unsigned short slave_timeout; /* when? */
197} ax25_dama_info;
198
199struct ctl_table;
200
201typedef struct ax25_dev {
202 struct ax25_dev *next;
203 struct net_device *dev;
204 struct net_device *forward;
205 struct ctl_table *systable;
206 int values[AX25_MAX_VALUES];
207#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
208 ax25_dama_info dama;
209#endif
210} ax25_dev;
211
212typedef struct ax25_cb {
213 struct hlist_node ax25_node;
214 ax25_address source_addr, dest_addr;
215 ax25_digi *digipeat;
216 ax25_dev *ax25_dev;
217 unsigned char iamdigi;
218 unsigned char state, modulus, pidincl;
219 unsigned short vs, vr, va;
220 unsigned char condition, backoff;
221 unsigned char n2, n2count;
222 struct timer_list t1timer, t2timer, t3timer, idletimer;
223 unsigned long t1, t2, t3, idle, rtt;
224 unsigned short paclen, fragno, fraglen;
225 struct sk_buff_head write_queue;
226 struct sk_buff_head reseq_queue;
227 struct sk_buff_head ack_queue;
228 struct sk_buff_head frag_queue;
229 unsigned char window;
230 struct timer_list timer, dtimer;
231 struct sock *sk; /* Backlink to socket */
232 atomic_t refcount;
233} ax25_cb;
234
235#define ax25_sk(__sk) ((ax25_cb *)(__sk)->sk_protinfo)
236
237#define ax25_for_each(__ax25, node, list) \
238 hlist_for_each_entry(__ax25, node, list, ax25_node)
239
240#define ax25_cb_hold(__ax25) \
241 atomic_inc(&((__ax25)->refcount))
242
243static __inline__ void ax25_cb_put(ax25_cb *ax25)
244{
245 if (atomic_dec_and_test(&ax25->refcount)) {
b4558ea9 246 kfree(ax25->digipeat);
1da177e4
LT		 247 kfree(ax25);
248 }
249}
250
f852640e 251static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev)
56cb5156
ACM		 252{
253 skb->dev = dev;
254 skb->pkt_type = PACKET_HOST;
255 skb->mac.raw = skb->data;
256 return htons(ETH_P_AX25);
257}
258
1da177e4
LT		 259/* af_ax25.c */
260extern struct hlist_head ax25_list;
261extern spinlock_t ax25_list_lock;
262extern void ax25_cb_add(ax25_cb *);
263struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int);
264struct sock *ax25_get_socket(ax25_address *, ax25_address *, int);
265extern ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
266extern void ax25_send_to_raw(ax25_address *, struct sk_buff *, int);
267extern void ax25_destroy_socket(ax25_cb *);
268extern ax25_cb *ax25_create_cb(void);
269extern void ax25_fillin_cb(ax25_cb *, ax25_dev *);
270extern struct sock *ax25_make_new(struct sock *, struct ax25_dev *);
271
272/* ax25_addr.c */
273extern ax25_address null_ax25_address;
f75268cd 274extern char *ax2asc(char *buf, ax25_address *);
baed16a7 275extern void asc2ax(ax25_address *addr, char *callsign);
1da177e4
LT		 276extern int ax25cmp(ax25_address *, ax25_address *);
277extern int ax25digicmp(ax25_digi *, ax25_digi *);
278extern unsigned char *ax25_addr_parse(unsigned char *, int, ax25_address *, ax25_address *, ax25_digi *, int *, int *);
279extern int ax25_addr_build(unsigned char *, ax25_address *, ax25_address *, ax25_digi *, int, int);
280extern int ax25_addr_size(ax25_digi *);
281extern void ax25_digi_invert(ax25_digi *, ax25_digi *);
282
283/* ax25_dev.c */
284extern ax25_dev *ax25_dev_list;
285extern spinlock_t ax25_dev_lock;
286
287static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev)
288{
289 return dev->ax25_ptr;
290}
291
292extern ax25_dev *ax25_addr_ax25dev(ax25_address *);
293extern void ax25_dev_device_up(struct net_device *);
294extern void ax25_dev_device_down(struct net_device *);
295extern int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
296extern struct net_device *ax25_fwd_dev(struct net_device *);
297extern void ax25_dev_free(void);
298
299/* ax25_ds_in.c */
300extern int ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int);
301
302/* ax25_ds_subr.c */
303extern void ax25_ds_nr_error_recovery(ax25_cb *);
304extern void ax25_ds_enquiry_response(ax25_cb *);
305extern void ax25_ds_establish_data_link(ax25_cb *);
306extern void ax25_dev_dama_off(ax25_dev *);
307extern void ax25_dama_on(ax25_cb *);
308extern void ax25_dama_off(ax25_cb *);
309
310/* ax25_ds_timer.c */
311extern void ax25_ds_set_timer(ax25_dev *);
312extern void ax25_ds_del_timer(ax25_dev *);
313extern void ax25_ds_timer(ax25_cb *);
314extern void ax25_ds_t1_timeout(ax25_cb *);
315extern void ax25_ds_heartbeat_expiry(ax25_cb *);
316extern void ax25_ds_t3timer_expiry(ax25_cb *);
317extern void ax25_ds_idletimer_expiry(ax25_cb *);
318
319/* ax25_iface.c */
320extern int ax25_protocol_register(unsigned int, int (*)(struct sk_buff *, ax25_cb *));
321extern void ax25_protocol_release(unsigned int);
322extern int ax25_linkfail_register(void (*)(ax25_cb *, int));
323extern void ax25_linkfail_release(void (*)(ax25_cb *, int));
324extern int ax25_listen_register(ax25_address *, struct net_device *);
325extern void ax25_listen_release(ax25_address *, struct net_device *);
326extern int (*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *);
327extern int ax25_listen_mine(ax25_address *, struct net_device *);
328extern void ax25_link_failed(ax25_cb *, int);
329extern int ax25_protocol_is_registered(unsigned int);
330
331/* ax25_in.c */
332extern int ax25_rx_iframe(ax25_cb *, struct sk_buff *);
f2ccd8fa 333extern int ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
1da177e4
LT		 334
335/* ax25_ip.c */
6f74998e 336extern int ax25_hard_header(struct sk_buff *, struct net_device *, unsigned short, void *, void *, unsigned int);
1da177e4
LT		 337extern int ax25_rebuild_header(struct sk_buff *);
338
339/* ax25_out.c */
340extern ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
341extern void ax25_output(ax25_cb *, int, struct sk_buff *);
342extern void ax25_kick(ax25_cb *);
343extern void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int);
29c4be51 344extern void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev);
1da177e4
LT		 345extern int ax25_check_iframes_acked(ax25_cb *, unsigned short);
346
347/* ax25_route.c */
348extern void ax25_rt_device_down(struct net_device *);
349extern int ax25_rt_ioctl(unsigned int, void __user *);
350extern struct file_operations ax25_route_fops;
351extern int ax25_rt_autobind(ax25_cb *, ax25_address *);
352extern ax25_route *ax25_rt_find_route(ax25_route *, ax25_address *,
353 struct net_device *);
354extern struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *, ax25_address *, ax25_digi *);
355extern void ax25_rt_free(void);
356
357static inline void ax25_put_route(ax25_route *ax25_rt)
358{
359 atomic_dec(&ax25_rt->ref);
360}
361
362/* ax25_std_in.c */
363extern int ax25_std_frame_in(ax25_cb *, struct sk_buff *, int);
364
365/* ax25_std_subr.c */
366extern void ax25_std_nr_error_recovery(ax25_cb *);
367extern void ax25_std_establish_data_link(ax25_cb *);
368extern void ax25_std_transmit_enquiry(ax25_cb *);
369extern void ax25_std_enquiry_response(ax25_cb *);
370extern void ax25_std_timeout_response(ax25_cb *);
371
372/* ax25_std_timer.c */
373extern void ax25_std_heartbeat_expiry(ax25_cb *);
374extern void ax25_std_t1timer_expiry(ax25_cb *);
375extern void ax25_std_t2timer_expiry(ax25_cb *);
376extern void ax25_std_t3timer_expiry(ax25_cb *);
377extern void ax25_std_idletimer_expiry(ax25_cb *);
378
379/* ax25_subr.c */
380extern void ax25_clear_queues(ax25_cb *);
381extern void ax25_frames_acked(ax25_cb *, unsigned short);
382extern void ax25_requeue_frames(ax25_cb *);
383extern int ax25_validate_nr(ax25_cb *, unsigned short);
384extern int ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *);
385extern void ax25_send_control(ax25_cb *, int, int, int);
386extern void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *, ax25_digi *);
387extern void ax25_calculate_t1(ax25_cb *);
388extern void ax25_calculate_rtt(ax25_cb *);
389extern void ax25_disconnect(ax25_cb *, int);
390
391/* ax25_timer.c */
392extern void ax25_start_heartbeat(ax25_cb *);
393extern void ax25_start_t1timer(ax25_cb *);
394extern void ax25_start_t2timer(ax25_cb *);
395extern void ax25_start_t3timer(ax25_cb *);
396extern void ax25_start_idletimer(ax25_cb *);
397extern void ax25_stop_heartbeat(ax25_cb *);
398extern void ax25_stop_t1timer(ax25_cb *);
399extern void ax25_stop_t2timer(ax25_cb *);
400extern void ax25_stop_t3timer(ax25_cb *);
401extern void ax25_stop_idletimer(ax25_cb *);
402extern int ax25_t1timer_running(ax25_cb *);
403extern unsigned long ax25_display_timer(struct timer_list *);
404
405/* ax25_uid.c */
406extern int ax25_uid_policy;
01d7dd0e 407extern ax25_uid_assoc *ax25_findbyuid(uid_t);
1da177e4
LT		 408extern int ax25_uid_ioctl(int, struct sockaddr_ax25 *);
409extern struct file_operations ax25_uid_fops;
410extern void ax25_uid_free(void);
411
412/* sysctl_net_ax25.c */
413#ifdef CONFIG_SYSCTL
414extern void ax25_register_sysctl(void);
415extern void ax25_unregister_sysctl(void);
416#else
417static inline void ax25_register_sysctl(void) {};
418static inline void ax25_unregister_sysctl(void) {};
419#endif /* CONFIG_SYSCTL */
420
421#endif
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