RxRPC: Parse security index 5 keys (Kerberos 5)
[linux-2.6.git] / net / rxrpc / ar-internal.h
1 /* AF_RXRPC internal definitions
2  *
3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells (dhowells@redhat.com)
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11
12 #include <rxrpc/packet.h>
13
14 #if 0
15 #define CHECK_SLAB_OKAY(X)                                   \
16         BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
17                (POISON_FREE << 8 | POISON_FREE))
18 #else
19 #define CHECK_SLAB_OKAY(X) do {} while(0)
20 #endif
21
22 #define FCRYPT_BSIZE 8
23 struct rxrpc_crypt {
24         union {
25                 u8      x[FCRYPT_BSIZE];
26                 __be32  n[2];
27         };
28 } __attribute__((aligned(8)));
29
30 #define rxrpc_queue_work(WS)    queue_work(rxrpc_workqueue, (WS))
31 #define rxrpc_queue_delayed_work(WS,D)  \
32         queue_delayed_work(rxrpc_workqueue, (WS), (D))
33
34 #define rxrpc_queue_call(CALL)  rxrpc_queue_work(&(CALL)->processor)
35 #define rxrpc_queue_conn(CONN)  rxrpc_queue_work(&(CONN)->processor)
36
37 /*
38  * sk_state for RxRPC sockets
39  */
40 enum {
41         RXRPC_UNCONNECTED = 0,
42         RXRPC_CLIENT_BOUND,             /* client local address bound */
43         RXRPC_CLIENT_CONNECTED,         /* client is connected */
44         RXRPC_SERVER_BOUND,             /* server local address bound */
45         RXRPC_SERVER_LISTENING,         /* server listening for connections */
46         RXRPC_CLOSE,                    /* socket is being closed */
47 };
48
49 /*
50  * RxRPC socket definition
51  */
52 struct rxrpc_sock {
53         /* WARNING: sk has to be the first member */
54         struct sock             sk;
55         rxrpc_interceptor_t     interceptor;    /* kernel service Rx interceptor function */
56         struct rxrpc_local      *local;         /* local endpoint */
57         struct rxrpc_transport  *trans;         /* transport handler */
58         struct rxrpc_conn_bundle *bundle;       /* virtual connection bundle */
59         struct rxrpc_connection *conn;          /* exclusive virtual connection */
60         struct list_head        listen_link;    /* link in the local endpoint's listen list */
61         struct list_head        secureq;        /* calls awaiting connection security clearance */
62         struct list_head        acceptq;        /* calls awaiting acceptance */
63         struct key              *key;           /* security for this socket */
64         struct key              *securities;    /* list of server security descriptors */
65         struct rb_root          calls;          /* outstanding calls on this socket */
66         unsigned long           flags;
67 #define RXRPC_SOCK_EXCLUSIVE_CONN       1       /* exclusive connection for a client socket */
68         rwlock_t                call_lock;      /* lock for calls */
69         u32                     min_sec_level;  /* minimum security level */
70 #define RXRPC_SECURITY_MAX      RXRPC_SECURITY_ENCRYPT
71         struct sockaddr_rxrpc   srx;            /* local address */
72         sa_family_t             proto;          /* protocol created with */
73         __be16                  service_id;     /* service ID of local/remote service */
74 };
75
76 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
77
78 /*
79  * RxRPC socket buffer private variables
80  * - max 48 bytes (struct sk_buff::cb)
81  */
82 struct rxrpc_skb_priv {
83         struct rxrpc_call       *call;          /* call with which associated */
84         unsigned long           resend_at;      /* time in jiffies at which to resend */
85         union {
86                 unsigned        offset;         /* offset into buffer of next read */
87                 int             remain;         /* amount of space remaining for next write */
88                 u32             error;          /* network error code */
89                 bool            need_resend;    /* T if needs resending */
90         };
91
92         struct rxrpc_header     hdr;            /* RxRPC packet header from this packet */
93 };
94
95 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
96
97 enum rxrpc_command {
98         RXRPC_CMD_SEND_DATA,            /* send data message */
99         RXRPC_CMD_SEND_ABORT,           /* request abort generation */
100         RXRPC_CMD_ACCEPT,               /* [server] accept incoming call */
101         RXRPC_CMD_REJECT_BUSY,          /* [server] reject a call as busy */
102 };
103
104 /*
105  * RxRPC security module interface
106  */
107 struct rxrpc_security {
108         struct module           *owner;         /* providing module */
109         struct list_head        link;           /* link in master list */
110         const char              *name;          /* name of this service */
111         u8                      security_index; /* security type provided */
112
113         /* initialise a connection's security */
114         int (*init_connection_security)(struct rxrpc_connection *);
115
116         /* prime a connection's packet security */
117         void (*prime_packet_security)(struct rxrpc_connection *);
118
119         /* impose security on a packet */
120         int (*secure_packet)(const struct rxrpc_call *,
121                              struct sk_buff *,
122                              size_t,
123                              void *);
124
125         /* verify the security on a received packet */
126         int (*verify_packet)(const struct rxrpc_call *, struct sk_buff *,
127                              u32 *);
128
129         /* issue a challenge */
130         int (*issue_challenge)(struct rxrpc_connection *);
131
132         /* respond to a challenge */
133         int (*respond_to_challenge)(struct rxrpc_connection *,
134                                     struct sk_buff *,
135                                     u32 *);
136
137         /* verify a response */
138         int (*verify_response)(struct rxrpc_connection *,
139                                struct sk_buff *,
140                                u32 *);
141
142         /* clear connection security */
143         void (*clear)(struct rxrpc_connection *);
144 };
145
146 /*
147  * RxRPC local transport endpoint definition
148  * - matched by local port, address and protocol type
149  */
150 struct rxrpc_local {
151         struct socket           *socket;        /* my UDP socket */
152         struct work_struct      destroyer;      /* endpoint destroyer */
153         struct work_struct      acceptor;       /* incoming call processor */
154         struct work_struct      rejecter;       /* packet reject writer */
155         struct list_head        services;       /* services listening on this endpoint */
156         struct list_head        link;           /* link in endpoint list */
157         struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
158         struct sk_buff_head     accept_queue;   /* incoming calls awaiting acceptance */
159         struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
160         spinlock_t              lock;           /* access lock */
161         rwlock_t                services_lock;  /* lock for services list */
162         atomic_t                usage;
163         int                     debug_id;       /* debug ID for printks */
164         volatile char           error_rcvd;     /* T if received ICMP error outstanding */
165         struct sockaddr_rxrpc   srx;            /* local address */
166 };
167
168 /*
169  * RxRPC remote transport endpoint definition
170  * - matched by remote port, address and protocol type
171  * - holds the connection ID counter for connections between the two endpoints
172  */
173 struct rxrpc_peer {
174         struct work_struct      destroyer;      /* peer destroyer */
175         struct list_head        link;           /* link in master peer list */
176         struct list_head        error_targets;  /* targets for net error distribution */
177         spinlock_t              lock;           /* access lock */
178         atomic_t                usage;
179         unsigned                if_mtu;         /* interface MTU for this peer */
180         unsigned                mtu;            /* network MTU for this peer */
181         unsigned                maxdata;        /* data size (MTU - hdrsize) */
182         unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
183         int                     debug_id;       /* debug ID for printks */
184         int                     net_error;      /* network error distributed */
185         struct sockaddr_rxrpc   srx;            /* remote address */
186
187         /* calculated RTT cache */
188 #define RXRPC_RTT_CACHE_SIZE 32
189         suseconds_t             rtt;            /* current RTT estimate (in uS) */
190         unsigned                rtt_point;      /* next entry at which to insert */
191         unsigned                rtt_usage;      /* amount of cache actually used */
192         suseconds_t             rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* calculated RTT cache */
193 };
194
195 /*
196  * RxRPC point-to-point transport / connection manager definition
197  * - handles a bundle of connections between two endpoints
198  * - matched by { local, peer }
199  */
200 struct rxrpc_transport {
201         struct rxrpc_local      *local;         /* local transport endpoint */
202         struct rxrpc_peer       *peer;          /* remote transport endpoint */
203         struct work_struct      error_handler;  /* network error distributor */
204         struct rb_root          bundles;        /* client connection bundles on this transport */
205         struct rb_root          client_conns;   /* client connections on this transport */
206         struct rb_root          server_conns;   /* server connections on this transport */
207         struct list_head        link;           /* link in master session list */
208         struct sk_buff_head     error_queue;    /* error packets awaiting processing */
209         time_t                  put_time;       /* time at which to reap */
210         spinlock_t              client_lock;    /* client connection allocation lock */
211         rwlock_t                conn_lock;      /* lock for active/dead connections */
212         atomic_t                usage;
213         int                     debug_id;       /* debug ID for printks */
214         unsigned int            conn_idcounter; /* connection ID counter (client) */
215 };
216
217 /*
218  * RxRPC client connection bundle
219  * - matched by { transport, service_id, key }
220  */
221 struct rxrpc_conn_bundle {
222         struct rb_node          node;           /* node in transport's lookup tree */
223         struct list_head        unused_conns;   /* unused connections in this bundle */
224         struct list_head        avail_conns;    /* available connections in this bundle */
225         struct list_head        busy_conns;     /* busy connections in this bundle */
226         struct key              *key;           /* security for this bundle */
227         wait_queue_head_t       chanwait;       /* wait for channel to become available */
228         atomic_t                usage;
229         int                     debug_id;       /* debug ID for printks */
230         unsigned short          num_conns;      /* number of connections in this bundle */
231         __be16                  service_id;     /* service ID */
232         uint8_t                 security_ix;    /* security type */
233 };
234
235 /*
236  * RxRPC connection definition
237  * - matched by { transport, service_id, conn_id, direction, key }
238  * - each connection can only handle four simultaneous calls
239  */
240 struct rxrpc_connection {
241         struct rxrpc_transport  *trans;         /* transport session */
242         struct rxrpc_conn_bundle *bundle;       /* connection bundle (client) */
243         struct work_struct      processor;      /* connection event processor */
244         struct rb_node          node;           /* node in transport's lookup tree */
245         struct list_head        link;           /* link in master connection list */
246         struct list_head        bundle_link;    /* link in bundle */
247         struct rb_root          calls;          /* calls on this connection */
248         struct sk_buff_head     rx_queue;       /* received conn-level packets */
249         struct rxrpc_call       *channels[RXRPC_MAXCALLS]; /* channels (active calls) */
250         struct rxrpc_security   *security;      /* applied security module */
251         struct key              *key;           /* security for this connection (client) */
252         struct key              *server_key;    /* security for this service */
253         struct crypto_blkcipher *cipher;        /* encryption handle */
254         struct rxrpc_crypt      csum_iv;        /* packet checksum base */
255         unsigned long           events;
256 #define RXRPC_CONN_CHALLENGE    0               /* send challenge packet */
257         time_t                  put_time;       /* time at which to reap */
258         rwlock_t                lock;           /* access lock */
259         spinlock_t              state_lock;     /* state-change lock */
260         atomic_t                usage;
261         u32                     real_conn_id;   /* connection ID (host-endian) */
262         enum {                                  /* current state of connection */
263                 RXRPC_CONN_UNUSED,              /* - connection not yet attempted */
264                 RXRPC_CONN_CLIENT,              /* - client connection */
265                 RXRPC_CONN_SERVER_UNSECURED,    /* - server unsecured connection */
266                 RXRPC_CONN_SERVER_CHALLENGING,  /* - server challenging for security */
267                 RXRPC_CONN_SERVER,              /* - server secured connection */
268                 RXRPC_CONN_REMOTELY_ABORTED,    /* - conn aborted by peer */
269                 RXRPC_CONN_LOCALLY_ABORTED,     /* - conn aborted locally */
270                 RXRPC_CONN_NETWORK_ERROR,       /* - conn terminated by network error */
271         } state;
272         int                     error;          /* error code for local abort */
273         int                     debug_id;       /* debug ID for printks */
274         unsigned                call_counter;   /* call ID counter */
275         atomic_t                serial;         /* packet serial number counter */
276         atomic_t                hi_serial;      /* highest serial number received */
277         u8                      avail_calls;    /* number of calls available */
278         u8                      size_align;     /* data size alignment (for security) */
279         u8                      header_size;    /* rxrpc + security header size */
280         u8                      security_size;  /* security header size */
281         u32                     security_level; /* security level negotiated */
282         u32                     security_nonce; /* response re-use preventer */
283
284         /* the following are all in net order */
285         __be32                  epoch;          /* epoch of this connection */
286         __be32                  cid;            /* connection ID */
287         __be16                  service_id;     /* service ID */
288         u8                      security_ix;    /* security type */
289         u8                      in_clientflag;  /* RXRPC_CLIENT_INITIATED if we are server */
290         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
291 };
292
293 /*
294  * RxRPC call definition
295  * - matched by { connection, call_id }
296  */
297 struct rxrpc_call {
298         struct rxrpc_connection *conn;          /* connection carrying call */
299         struct rxrpc_sock       *socket;        /* socket responsible */
300         struct timer_list       lifetimer;      /* lifetime remaining on call */
301         struct timer_list       deadspan;       /* reap timer for re-ACK'ing, etc  */
302         struct timer_list       ack_timer;      /* ACK generation timer */
303         struct timer_list       resend_timer;   /* Tx resend timer */
304         struct work_struct      destroyer;      /* call destroyer */
305         struct work_struct      processor;      /* packet processor and ACK generator */
306         struct list_head        link;           /* link in master call list */
307         struct list_head        error_link;     /* link in error distribution list */
308         struct list_head        accept_link;    /* calls awaiting acceptance */
309         struct rb_node          sock_node;      /* node in socket call tree */
310         struct rb_node          conn_node;      /* node in connection call tree */
311         struct sk_buff_head     rx_queue;       /* received packets */
312         struct sk_buff_head     rx_oos_queue;   /* packets received out of sequence */
313         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
314         wait_queue_head_t       tx_waitq;       /* wait for Tx window space to become available */
315         unsigned long           user_call_ID;   /* user-defined call ID */
316         unsigned long           creation_jif;   /* time of call creation */
317         unsigned long           flags;
318 #define RXRPC_CALL_RELEASED     0       /* call has been released - no more message to userspace */
319 #define RXRPC_CALL_TERMINAL_MSG 1       /* call has given the socket its final message */
320 #define RXRPC_CALL_RCVD_LAST    2       /* all packets received */
321 #define RXRPC_CALL_RUN_RTIMER   3       /* Tx resend timer started */
322 #define RXRPC_CALL_TX_SOFT_ACK  4       /* sent some soft ACKs */
323 #define RXRPC_CALL_PROC_BUSY    5       /* the processor is busy */
324 #define RXRPC_CALL_INIT_ACCEPT  6       /* acceptance was initiated */
325 #define RXRPC_CALL_HAS_USERID   7       /* has a user ID attached */
326 #define RXRPC_CALL_EXPECT_OOS   8       /* expect out of sequence packets */
327         unsigned long           events;
328 #define RXRPC_CALL_RCVD_ACKALL  0       /* ACKALL or reply received */
329 #define RXRPC_CALL_RCVD_BUSY    1       /* busy packet received */
330 #define RXRPC_CALL_RCVD_ABORT   2       /* abort packet received */
331 #define RXRPC_CALL_RCVD_ERROR   3       /* network error received */
332 #define RXRPC_CALL_ACK_FINAL    4       /* need to generate final ACK (and release call) */
333 #define RXRPC_CALL_ACK          5       /* need to generate ACK */
334 #define RXRPC_CALL_REJECT_BUSY  6       /* need to generate busy message */
335 #define RXRPC_CALL_ABORT        7       /* need to generate abort */
336 #define RXRPC_CALL_CONN_ABORT   8       /* local connection abort generated */
337 #define RXRPC_CALL_RESEND_TIMER 9       /* Tx resend timer expired */
338 #define RXRPC_CALL_RESEND       10      /* Tx resend required */
339 #define RXRPC_CALL_DRAIN_RX_OOS 11      /* drain the Rx out of sequence queue */
340 #define RXRPC_CALL_LIFE_TIMER   12      /* call's lifetimer ran out */
341 #define RXRPC_CALL_ACCEPTED     13      /* incoming call accepted by userspace app */
342 #define RXRPC_CALL_SECURED      14      /* incoming call's connection is now secure */
343 #define RXRPC_CALL_POST_ACCEPT  15      /* need to post an "accept?" message to the app */
344 #define RXRPC_CALL_RELEASE      16      /* need to release the call's resources */
345
346         spinlock_t              lock;
347         rwlock_t                state_lock;     /* lock for state transition */
348         atomic_t                usage;
349         atomic_t                sequence;       /* Tx data packet sequence counter */
350         u32                     abort_code;     /* local/remote abort code */
351         enum {                                  /* current state of call */
352                 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
353                 RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
354                 RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
355                 RXRPC_CALL_CLIENT_FINAL_ACK,    /* - client sending final ACK phase */
356                 RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
357                 RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
358                 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
359                 RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
360                 RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
361                 RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
362                 RXRPC_CALL_COMPLETE,            /* - call completed */
363                 RXRPC_CALL_SERVER_BUSY,         /* - call rejected by busy server */
364                 RXRPC_CALL_REMOTELY_ABORTED,    /* - call aborted by peer */
365                 RXRPC_CALL_LOCALLY_ABORTED,     /* - call aborted locally on error or close */
366                 RXRPC_CALL_NETWORK_ERROR,       /* - call terminated by network error */
367                 RXRPC_CALL_DEAD,                /* - call is dead */
368         } state;
369         int                     debug_id;       /* debug ID for printks */
370         u8                      channel;        /* connection channel occupied by this call */
371
372         /* transmission-phase ACK management */
373         uint8_t                 acks_head;      /* offset into window of first entry */
374         uint8_t                 acks_tail;      /* offset into window of last entry */
375         uint8_t                 acks_winsz;     /* size of un-ACK'd window */
376         uint8_t                 acks_unacked;   /* lowest unacked packet in last ACK received */
377         int                     acks_latest;    /* serial number of latest ACK received */
378         rxrpc_seq_t             acks_hard;      /* highest definitively ACK'd msg seq */
379         unsigned long           *acks_window;   /* sent packet window
380                                                  * - elements are pointers with LSB set if ACK'd
381                                                  */
382
383         /* receive-phase ACK management */
384         rxrpc_seq_t             rx_data_expect; /* next data seq ID expected to be received */
385         rxrpc_seq_t             rx_data_post;   /* next data seq ID expected to be posted */
386         rxrpc_seq_t             rx_data_recv;   /* last data seq ID encountered by recvmsg */
387         rxrpc_seq_t             rx_data_eaten;  /* last data seq ID consumed by recvmsg */
388         rxrpc_seq_t             rx_first_oos;   /* first packet in rx_oos_queue (or 0) */
389         rxrpc_seq_t             ackr_win_top;   /* top of ACK window (rx_data_eaten is bottom) */
390         rxrpc_seq_net_t         ackr_prev_seq;  /* previous sequence number received */
391         uint8_t                 ackr_reason;    /* reason to ACK */
392         __be32                  ackr_serial;    /* serial of packet being ACK'd */
393         atomic_t                ackr_not_idle;  /* number of packets in Rx queue */
394
395         /* received packet records, 1 bit per record */
396 #define RXRPC_ACKR_WINDOW_ASZ DIV_ROUND_UP(RXRPC_MAXACKS, BITS_PER_LONG)
397         unsigned long           ackr_window[RXRPC_ACKR_WINDOW_ASZ + 1];
398
399         /* the following should all be in net order */
400         __be32                  cid;            /* connection ID + channel index  */
401         __be32                  call_id;        /* call ID on connection  */
402 };
403
404 /*
405  * locally abort an RxRPC call
406  */
407 static inline void rxrpc_abort_call(struct rxrpc_call *call, u32 abort_code)
408 {
409         write_lock_bh(&call->state_lock);
410         if (call->state < RXRPC_CALL_COMPLETE) {
411                 call->abort_code = abort_code;
412                 call->state = RXRPC_CALL_LOCALLY_ABORTED;
413                 set_bit(RXRPC_CALL_ABORT, &call->events);
414         }
415         write_unlock_bh(&call->state_lock);
416 }
417
418 /*
419  * af_rxrpc.c
420  */
421 extern atomic_t rxrpc_n_skbs;
422 extern __be32 rxrpc_epoch;
423 extern atomic_t rxrpc_debug_id;
424 extern struct workqueue_struct *rxrpc_workqueue;
425
426 /*
427  * ar-accept.c
428  */
429 extern void rxrpc_accept_incoming_calls(struct work_struct *);
430 extern struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *,
431                                             unsigned long);
432 extern int rxrpc_reject_call(struct rxrpc_sock *);
433
434 /*
435  * ar-ack.c
436  */
437 extern void __rxrpc_propose_ACK(struct rxrpc_call *, uint8_t, __be32, bool);
438 extern void rxrpc_propose_ACK(struct rxrpc_call *, uint8_t, __be32, bool);
439 extern void rxrpc_process_call(struct work_struct *);
440
441 /*
442  * ar-call.c
443  */
444 extern struct kmem_cache *rxrpc_call_jar;
445 extern struct list_head rxrpc_calls;
446 extern rwlock_t rxrpc_call_lock;
447
448 extern struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *,
449                                                 struct rxrpc_transport *,
450                                                 struct rxrpc_conn_bundle *,
451                                                 unsigned long, int, gfp_t);
452 extern struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *,
453                                               struct rxrpc_connection *,
454                                               struct rxrpc_header *, gfp_t);
455 extern struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *,
456                                                  unsigned long);
457 extern void rxrpc_release_call(struct rxrpc_call *);
458 extern void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
459 extern void __rxrpc_put_call(struct rxrpc_call *);
460 extern void __exit rxrpc_destroy_all_calls(void);
461
462 /*
463  * ar-connection.c
464  */
465 extern struct list_head rxrpc_connections;
466 extern rwlock_t rxrpc_connection_lock;
467
468 extern struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *,
469                                                   struct rxrpc_transport *,
470                                                   struct key *,
471                                                   __be16, gfp_t);
472 extern void rxrpc_put_bundle(struct rxrpc_transport *,
473                              struct rxrpc_conn_bundle *);
474 extern int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_transport *,
475                               struct rxrpc_conn_bundle *, struct rxrpc_call *,
476                               gfp_t);
477 extern void rxrpc_put_connection(struct rxrpc_connection *);
478 extern void __exit rxrpc_destroy_all_connections(void);
479 extern struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *,
480                                                       struct rxrpc_header *);
481 extern struct rxrpc_connection *
482 rxrpc_incoming_connection(struct rxrpc_transport *, struct rxrpc_header *,
483                           gfp_t);
484
485 /*
486  * ar-connevent.c
487  */
488 extern void rxrpc_process_connection(struct work_struct *);
489 extern void rxrpc_reject_packet(struct rxrpc_local *, struct sk_buff *);
490 extern void rxrpc_reject_packets(struct work_struct *);
491
492 /*
493  * ar-error.c
494  */
495 extern void rxrpc_UDP_error_report(struct sock *);
496 extern void rxrpc_UDP_error_handler(struct work_struct *);
497
498 /*
499  * ar-input.c
500  */
501 extern unsigned long rxrpc_ack_timeout;
502 extern const char *rxrpc_pkts[];
503
504 extern void rxrpc_data_ready(struct sock *, int);
505 extern int rxrpc_queue_rcv_skb(struct rxrpc_call *, struct sk_buff *, bool,
506                                bool);
507 extern void rxrpc_fast_process_packet(struct rxrpc_call *, struct sk_buff *);
508
509 /*
510  * ar-local.c
511  */
512 extern rwlock_t rxrpc_local_lock;
513 extern struct rxrpc_local *rxrpc_lookup_local(struct sockaddr_rxrpc *);
514 extern void rxrpc_put_local(struct rxrpc_local *);
515 extern void __exit rxrpc_destroy_all_locals(void);
516
517 /*
518  * ar-key.c
519  */
520 extern struct key_type key_type_rxrpc;
521 extern struct key_type key_type_rxrpc_s;
522
523 extern int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
524 extern int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
525 extern int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *,
526                                      time_t, u32);
527
528 /*
529  * ar-output.c
530  */
531 extern int rxrpc_resend_timeout;
532
533 extern int rxrpc_send_packet(struct rxrpc_transport *, struct sk_buff *);
534 extern int rxrpc_client_sendmsg(struct kiocb *, struct rxrpc_sock *,
535                                 struct rxrpc_transport *, struct msghdr *,
536                                 size_t);
537 extern int rxrpc_server_sendmsg(struct kiocb *, struct rxrpc_sock *,
538                                 struct msghdr *, size_t);
539
540 /*
541  * ar-peer.c
542  */
543 extern struct rxrpc_peer *rxrpc_get_peer(struct sockaddr_rxrpc *, gfp_t);
544 extern void rxrpc_put_peer(struct rxrpc_peer *);
545 extern struct rxrpc_peer *rxrpc_find_peer(struct rxrpc_local *,
546                                           __be32, __be16);
547 extern void __exit rxrpc_destroy_all_peers(void);
548
549 /*
550  * ar-proc.c
551  */
552 extern const char *const rxrpc_call_states[];
553 extern const struct file_operations rxrpc_call_seq_fops;
554 extern const struct file_operations rxrpc_connection_seq_fops;
555
556 /*
557  * ar-recvmsg.c
558  */
559 extern void rxrpc_remove_user_ID(struct rxrpc_sock *, struct rxrpc_call *);
560 extern int rxrpc_recvmsg(struct kiocb *, struct socket *, struct msghdr *,
561                          size_t, int);
562
563 /*
564  * ar-security.c
565  */
566 extern int rxrpc_register_security(struct rxrpc_security *);
567 extern void rxrpc_unregister_security(struct rxrpc_security *);
568 extern int rxrpc_init_client_conn_security(struct rxrpc_connection *);
569 extern int rxrpc_init_server_conn_security(struct rxrpc_connection *);
570 extern int rxrpc_secure_packet(const struct rxrpc_call *, struct sk_buff *,
571                                size_t, void *);
572 extern int rxrpc_verify_packet(const struct rxrpc_call *, struct sk_buff *,
573                                u32 *);
574 extern void rxrpc_clear_conn_security(struct rxrpc_connection *);
575
576 /*
577  * ar-skbuff.c
578  */
579 extern void rxrpc_packet_destructor(struct sk_buff *);
580
581 /*
582  * ar-transport.c
583  */
584 extern struct rxrpc_transport *rxrpc_get_transport(struct rxrpc_local *,
585                                                    struct rxrpc_peer *,
586                                                    gfp_t);
587 extern void rxrpc_put_transport(struct rxrpc_transport *);
588 extern void __exit rxrpc_destroy_all_transports(void);
589 extern struct rxrpc_transport *rxrpc_find_transport(struct rxrpc_local *,
590                                                     struct rxrpc_peer *);
591
592 /*
593  * debug tracing
594  */
595 extern unsigned rxrpc_debug;
596
597 #define dbgprintk(FMT,...) \
598         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
599
600 /* make sure we maintain the format strings, even when debugging is disabled */
601 static inline __attribute__((format(printf,1,2)))
602 void _dbprintk(const char *fmt, ...)
603 {
604 }
605
606 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
607 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
608 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
609 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
610 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
611
612
613 #if defined(__KDEBUG)
614 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
615 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
616 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
617 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
618 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
619
620 #elif defined(CONFIG_AF_RXRPC_DEBUG)
621 #define RXRPC_DEBUG_KENTER      0x01
622 #define RXRPC_DEBUG_KLEAVE      0x02
623 #define RXRPC_DEBUG_KDEBUG      0x04
624 #define RXRPC_DEBUG_KPROTO      0x08
625 #define RXRPC_DEBUG_KNET        0x10
626
627 #define _enter(FMT,...)                                 \
628 do {                                                    \
629         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
630                 kenter(FMT,##__VA_ARGS__);              \
631 } while (0)
632
633 #define _leave(FMT,...)                                 \
634 do {                                                    \
635         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
636                 kleave(FMT,##__VA_ARGS__);              \
637 } while (0)
638
639 #define _debug(FMT,...)                                 \
640 do {                                                    \
641         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
642                 kdebug(FMT,##__VA_ARGS__);              \
643 } while (0)
644
645 #define _proto(FMT,...)                                 \
646 do {                                                    \
647         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
648                 kproto(FMT,##__VA_ARGS__);              \
649 } while (0)
650
651 #define _net(FMT,...)                                   \
652 do {                                                    \
653         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
654                 knet(FMT,##__VA_ARGS__);                \
655 } while (0)
656
657 #else
658 #define _enter(FMT,...) _dbprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
659 #define _leave(FMT,...) _dbprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
660 #define _debug(FMT,...) _dbprintk("    "FMT ,##__VA_ARGS__)
661 #define _proto(FMT,...) _dbprintk("### "FMT ,##__VA_ARGS__)
662 #define _net(FMT,...)   _dbprintk("@@@ "FMT ,##__VA_ARGS__)
663 #endif
664
665 /*
666  * debug assertion checking
667  */
668 #if 1 // defined(__KDEBUGALL)
669
670 #define ASSERT(X)                                               \
671 do {                                                            \
672         if (unlikely(!(X))) {                                   \
673                 printk(KERN_ERR "\n");                          \
674                 printk(KERN_ERR "RxRPC: Assertion failed\n");   \
675                 BUG();                                          \
676         }                                                       \
677 } while(0)
678
679 #define ASSERTCMP(X, OP, Y)                                             \
680 do {                                                                    \
681         if (unlikely(!((X) OP (Y)))) {                                  \
682                 printk(KERN_ERR "\n");                                  \
683                 printk(KERN_ERR "RxRPC: Assertion failed\n");           \
684                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
685                        (unsigned long)(X), (unsigned long)(Y));         \
686                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
687                        (unsigned long)(X), (unsigned long)(Y));         \
688                 BUG();                                                  \
689         }                                                               \
690 } while(0)
691
692 #define ASSERTIF(C, X)                                          \
693 do {                                                            \
694         if (unlikely((C) && !(X))) {                            \
695                 printk(KERN_ERR "\n");                          \
696                 printk(KERN_ERR "RxRPC: Assertion failed\n");   \
697                 BUG();                                          \
698         }                                                       \
699 } while(0)
700
701 #define ASSERTIFCMP(C, X, OP, Y)                                        \
702 do {                                                                    \
703         if (unlikely((C) && !((X) OP (Y)))) {                           \
704                 printk(KERN_ERR "\n");                                  \
705                 printk(KERN_ERR "RxRPC: Assertion failed\n");           \
706                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
707                        (unsigned long)(X), (unsigned long)(Y));         \
708                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
709                        (unsigned long)(X), (unsigned long)(Y));         \
710                 BUG();                                                  \
711         }                                                               \
712 } while(0)
713
714 #else
715
716 #define ASSERT(X)                               \
717 do {                                            \
718 } while(0)
719
720 #define ASSERTCMP(X, OP, Y)                     \
721 do {                                            \
722 } while(0)
723
724 #define ASSERTIF(C, X)                          \
725 do {                                            \
726 } while(0)
727
728 #define ASSERTIFCMP(C, X, OP, Y)                \
729 do {                                            \
730 } while(0)
731
732 #endif /* __KDEBUGALL */
733
734 /*
735  * socket buffer accounting / leak finding
736  */
737 static inline void __rxrpc_new_skb(struct sk_buff *skb, const char *fn)
738 {
739         //_net("new skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
740         //atomic_inc(&rxrpc_n_skbs);
741 }
742
743 #define rxrpc_new_skb(skb) __rxrpc_new_skb((skb), __func__)
744
745 static inline void __rxrpc_kill_skb(struct sk_buff *skb, const char *fn)
746 {
747         //_net("kill skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
748         //atomic_dec(&rxrpc_n_skbs);
749 }
750
751 #define rxrpc_kill_skb(skb) __rxrpc_kill_skb((skb), __func__)
752
753 static inline void __rxrpc_free_skb(struct sk_buff *skb, const char *fn)
754 {
755         if (skb) {
756                 CHECK_SLAB_OKAY(&skb->users);
757                 //_net("free skb %p %s [%d]",
758                 //     skb, fn, atomic_read(&rxrpc_n_skbs));
759                 //atomic_dec(&rxrpc_n_skbs);
760                 kfree_skb(skb);
761         }
762 }
763
764 #define rxrpc_free_skb(skb) __rxrpc_free_skb((skb), __func__)
765
766 static inline void rxrpc_purge_queue(struct sk_buff_head *list)
767 {
768         struct sk_buff *skb;
769         while ((skb = skb_dequeue((list))) != NULL)
770                 rxrpc_free_skb(skb);
771 }
772
773 static inline void __rxrpc_get_local(struct rxrpc_local *local, const char *f)
774 {
775         CHECK_SLAB_OKAY(&local->usage);
776         if (atomic_inc_return(&local->usage) == 1)
777                 printk("resurrected (%s)\n", f);
778 }
779
780 #define rxrpc_get_local(LOCAL) __rxrpc_get_local((LOCAL), __func__)
781
782 #define rxrpc_get_call(CALL)                            \
783 do {                                                    \
784         CHECK_SLAB_OKAY(&(CALL)->usage);                \
785         if (atomic_inc_return(&(CALL)->usage) == 1)     \
786                 BUG();                                  \
787 } while(0)
788
789 #define rxrpc_put_call(CALL)                            \
790 do {                                                    \
791         __rxrpc_put_call(CALL);                         \
792 } while(0)